JP2000141857A - Sheet feeder for printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a positional deviation of a printed image or a wind-up of a sheet caused by a clamping miss of an impression cylinder by bringing about a sheet folding caused by an excess large deflection of the sheet formed between a register roller pair and an intermediate conveying roller pair or an insufficient feed of the sheet caused by no deflection. SOLUTION: The sheet feeder for a printer comprises a body sheet feeding controller for controlling a register motor 58 to accelerate a rotational speed of a register roller 33b to compensate a slip of a sheet P at register roller pairs 33a, 33b based on an output signal from a register sensor 52, then controlling the motor 58 to feed a leading edge of the sheet P to meet timing at a sheet gripper position of a sheet clamper 21 and controlling a sheet feeding motor 74 to maintain a deflection PA between the roller pair 33a, 33b and intermediate conveying roller pair 55a, 55b to meet the controls of the motors 58.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paper feeding device in a printing apparatus, and more particularly, to a printing device in which a master is wound around a plate cylinder, and a sheet is rolled on the impression cylinder or the plate cylinder with the impression cylinder or the plate cylinder. The present invention relates to a sheet feeding device in a printing device such as a stencil printing device that performs printing by pressing.

[0002]

2. Description of the Related Art In a printing apparatus such as a thermal digital stencil printing machine, a plate cylinder for winding a master made on an outer peripheral surface, and a paper clamper (holding means) for holding a leading end portion of fed paper. There is known a printing apparatus which includes an impression cylinder (pressing means) having substantially the same diameter as the outer diameter of the plate cylinder, and a pair of registration rollers (registration means) for feeding the leading end of the sheet toward a sheet clamper. An example of such a printing apparatus is disclosed in Japanese Patent Application No. 10-4824 filed by the present applicant.
No. 4, JP-A-9-216448, and the like.

On the other hand, a press roller (pressing means) for pressing the plate cylinder and a fed sheet against a master on the plate cylinder.
A pair of registration rollers for feeding the leading edge of the paper toward a printing unit formed between the plate cylinder and the press roller; and a bank paper supply unit provided below the impression cylinder for feeding paper toward a pair of registration rollers. The paper feed path provided between the pair of registration rollers and the bank paper feeding unit feeds the leading end of the paper fed from the bank paper feeding unit toward the pair of registration rollers, and is provided on the printing apparatus main body side. A pair of intermediate transport rollers (sheet transport means) that form a bend by contacting the pair of registration rollers
Is known. An example of such a printing apparatus is, for example, JP-A-6-40137. In the latter paper feeding device, a front loading method in which an operator or the like can perform operations such as replenishing and replenishing paper by pulling out and pushing in a paper feeding tray of a bank paper feeding unit in a position facing the front of the device. Is used.

[0004]

However, assuming a paper feeder in a printing apparatus in which the former printing apparatus is combined with the latter bank paper feeder, the paper fed from the bank paper feeder is assumed. When the leading end of the sheet is fed toward the registration roller pair by the intermediate conveyance roller pair, the following problem occurs.

That is, in the former printing apparatus, as proposed in Japanese Patent Application No. 10-48244, at least an impression cylinder for controlling the timing of feeding the leading edge of a sheet to a sheet clamper is provided. A pulse encoder having an encoder sensor for detecting rotation speed fluctuation,
A registration sensor (paper edge detection means) disposed in the paper feed path between the impression cylinder and the pair of registration rollers to detect the edge of the sheet
After controlling a registration motor (registration driving means) composed of a stepping motor based on a signal from the registration sensor to compensate for slippage of the paper in the registration roller pair, the paper clamper is controlled based on an output pulse signal from the encoder sensor. A registration drive control means for controlling a registration motor to feed the leading edge of the paper in synchronization with the rotation position of the paper, thereby changing the paper feed amount from the registration roller pair and the paper transport speed. However, the intermediate transport roller pair is rotated and driven so as to transport the leading edge of the paper at a constant paper transport speed. For this reason, the deflection of the sheet formed between the registration roller pair and the intermediate conveyance roller pair becomes excessively large, and the sheet is bent. Increases the paper transport load by acting as a kind of brake on the paper being printed), thereby causing a positional shift of the printed image or causing the paper to roll up due to a clamping error in the impression cylinder. There is a problem.

The reason why the amount of paper transported by the intermediate transport roller pair is increased is that the paper is transported while the paper is securely held at the nip portion of the intermediate transport roller pair, whereas the nip portion of the registration roller pair is transported. In this state, the front end of the paper is not clamped, but is bent while the front end of the paper is abutted against the position just before the nip of the registration roller pair, and the front end of the paper is held at the nip. If there is a paper transport load at the trailing end of the paper in order to feed it out, a slip will occur at the nip at the beginning of the grip of the paper, causing the paper feed amount by the pair of registration rollers to be intermediate. This is because the amount becomes relatively small with respect to the sheet feeding amount by the pair of conveying rollers.

Therefore, the present invention has been made in view of such circumstances, and when a pair of registration rollers is sending out a sheet, the paper formed between the pair of registration rollers and the pair of intermediate conveyance rollers is not removed. If the deflection becomes too large, the paper will break, or if the deflection is lost and the paper feed amount will be insufficient, the print image will be misaligned, or the paper will roll up due to a clamping error with the impression cylinder. An object of the present invention is to control a sheet conveyance driving unit that drives a sheet conveyance unit such as an intermediate conveyance roller together with the registration driving unit so as not to perform the operation.

[0008]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, a plate cylinder for winding a plate-making master around an outer peripheral surface and a leading end portion of a fed sheet are provided. An impression cylinder having a holding means for holding the printing drum, and having a diameter substantially the same as the outer diameter of the plate cylinder; a registration means for feeding the leading end of the sheet toward the holding means; and a bank paper feeding unit for feeding paper toward the registration means And feeding the leading end of a sheet fed from the bank paper feeding unit provided in a paper feeding path between the registration unit and the bank paper feeding unit toward the registration unit, and contacting the registration unit. A paper feeder in a printing apparatus comprising:
A registration driving unit that drives the registration unit; a sheet conveyance driving unit that drives the sheet conveyance unit; and at least one of the impression cylinders for controlling a timing of feeding a leading end of the sheet to the holding unit. A pulse encoder having an encoder sensor for detecting a rotation speed variation, a paper leading edge detecting unit disposed in a paper feeding path between the impression cylinder and the registration unit, and detecting a leading edge of the paper; After controlling the registration driving unit based on a signal from the detection unit to compensate for the slippage of the sheet in the registration unit, timing is adjusted to the rotational position of the holding unit based on an output pulse signal from the encoder sensor. Controlling the registration driving means so as to feed the leading edge of the sheet, and controlling each of the registration driving means. Align Te, and having a control means for controlling said sheet transport drive means to maintain the deflection between said register means and said sheet conveying means.

According to a second aspect of the present invention, in the paper feeder of the printing apparatus according to the first aspect, a delay time is provided between the activation of the registration unit and the activation of the sheet conveyance unit. And

[0010] The third aspect of the present invention is the first or second aspect.
In the paper feeding device of the printing apparatus, the registration driving unit includes a stepping motor, and the control unit controls the registration driving unit by changing at least the number of driving pulses output to the registration driving unit. It is characterized by.

According to a fourth aspect of the present invention, in the paper feeder of the printing apparatus according to the first, second or third aspect, the paper transport driving means comprises a stepping motor, and the control means comprises the paper transport driving means. The paper transport drive unit is controlled by changing at least the number of drive pulses output to the printer.

According to a fifth aspect of the present invention, in the paper feeder of the printing apparatus according to the third aspect, the control means further comprises, after compensating for the slippage of the sheet, responding to an output pulse signal from the encoder sensor. The resist driving means is feedback-controlled by changing a pulse width.

According to a sixth aspect of the present invention, in the paper feeder of the printing apparatus according to the fourth aspect, the control means further comprises, after compensating for the slippage of the paper, responding to an output pulse signal from the encoder sensor. The paper feed driving means is feedback-controlled by changing the pulse width.

According to a seventh aspect of the present invention, in the paper feeder of the printing apparatus according to the first, second, or third aspect, the output of the output pulse signal from the encoder sensor is started and the driving of the registration driving unit is started. A delay time is provided between the driving start time and a registration driving start time varying means for changing the driving start time to change the delay time according to the type of the paper.

[0015] The invention according to claim 8 provides the invention according to claims 1 to 6.
A paper feeding device in the printing device according to any one of the above,
A timing detecting means for setting a timing for feeding the leading end of the sheet by the registration means to the holding means is provided on the impression cylinder side.

According to a ninth aspect of the present invention, in the paper feeder in the printing apparatus according to the eighth aspect, a drive start time point at which an on-output signal is output from the timing detecting means and a driving start time of the registration driving means are started. There is provided a registration drive start varying means for providing a delay time between the start and the time and changing the drive start time to change the delay time in accordance with the type of the sheet.

According to a tenth aspect of the present invention, in the paper feeder of the printing apparatus according to the seventh or ninth aspect, the control means has a function of the registration drive start variable means.

According to an eleventh aspect of the present invention, in the paper feeder of the printing apparatus according to the seventh, ninth or tenth aspect, a paper type setting means for setting the type of the paper is provided.

According to a twelfth aspect of the present invention, in the paper feeder of the printing apparatus according to the seventh, ninth or tenth aspect, the invention is characterized in that the paper type is provided with a paper type detecting means for detecting the type of the paper.

In the embodiments of the invention to be described later, a technical configuration including the following new configuration is adopted, and will be described here. That is, the first technical configuration is such that, after forming a deflection, a registration unit for sending out the leading end of the sheet toward the image forming unit, a registration driving unit for driving the registration unit, and a sheet feeding for the registration unit A plurality of paper feeding units, a sheet provided from a paper feeding unit provided in a paper feeding path between the registration unit and the plurality of paper feeding units is sent out toward the registration unit, and In a sheet feeding device in an image forming apparatus including a sheet conveying unit that forms a bend by abutting, and a sheet conveying driving unit that drives the sheet conveying unit, the registration unit is driven by driving the registration driving unit. While the paper is being fed, the paper transport means feeds the paper by driving the paper transport drive means to maintain the deflection.

According to a second technical configuration, in the first technical configuration, the paper transport unit of the paper transport unit is configured to maintain the deflection in response to paper supply from any one of the plurality of paper supply units. It is characterized by having control means for controlling the paper transport driving means so as to change the speed.

According to a third technical configuration, in the second technical configuration, the plurality of paper supply units include a plurality of lower paper supply units provided below the printing unit. Controlling the sheet conveyance driving means so that the sheet conveyance speed in sheet feeding from an upper sheet feeding section of the lower sheet feeding section is higher than that from a lower sheet feeding section. I do.

According to a fourth technical configuration, in the second technical configuration, the control unit controls the sheet conveyance driving unit to change the sheet conveyance speed according to a sheet size.

According to a fifth technical configuration, in the second technical configuration, the control unit controls the sheet conveyance driving unit so as to change the sheet conveyance speed in accordance with a sheet type.

According to a sixth technical configuration, in the second technical configuration, the control unit controls the paper transport driving unit to change the paper transport speed in accordance with a printing speed.

According to a seventh technical configuration, in the paper supply in the printing apparatus according to the eighth aspect, the plurality of paper supply units each include a paper supply unit for supplying paper to the registration unit. And a sheet feed timing detecting means for setting a timing for sending out the leading edge of the sheet by each of the sheet feeding means to the registration means, provided on the impression cylinder side.

The "impression cylinder having substantially the same diameter as the outer diameter of the plate cylinder" in the invention described in claim 1 means that the outer diameter of the plate cylinder is the same as the outer diameter of the impression cylinder, This includes cases where the tolerance is within the dimensional tolerance range. The invention according to claim 1 or the seventh technical configuration is a method of performing printing by pressing the impression cylinder relatively to the plate cylinder, and performing printing by pressing the impression cylinder against the plate cylinder. There are a printing cylinder contacting / separating method for performing printing, a plate cylinder contacting / separating method for performing printing by pressing a plate cylinder against an impression cylinder, and a combination method thereof.
Specific examples of the impression cylinder contact / separation method include an impression cylinder and a contact / separation unit thereof according to an embodiment of the invention described later. On the other hand, the plate cylinder contact / separation method includes a known method in which the plate cylinder moves to the impression cylinder side (including a type in which an ink roller inside the plate cylinder projects to the impression cylinder side) to perform printing.

As the "pulse encoder", an incremental type that detects a relative rotation amount capable of detecting a rotation speed fluctuation, and an absolute rotation amount that can detect a rotation speed fluctuation and a position can be detected. Absolute type. Since the pulse encoder according to the first aspect of the invention detects at least rotation speed fluctuation in the impression cylinder, it includes both an incremental type and an absolute type. As the pulse encoder, a photo encoder is preferable in terms of stabilizing the detection performance and improving the reliability, but a magnetic encoder or the like may be used if this is not required. The pulse encoder is more preferably provided on the impression cylinder side, and the pulse encoder may be arranged on a main motor or a plate cylinder side that rotationally drives a plate cylinder that is synchronously rotated with the impression cylinder. In this case, the “impression cylinder side” includes the “impression cylinder side” in the impression cylinder contact / separation method, including the “impression cylinder side” of the invention described in claim 8 and the seventh technical configuration. Alternatively, it refers to the side of the impression cylinder including a member that is displaced substantially synchronously with the displacement operation of the impression cylinder with respect to the plate cylinder. In the case of the plate cylinder contact / separation method, it refers to the impression cylinder itself including the impression cylinder itself or the apparatus main body near the impression cylinder. The "bank paper feeding section" of the invention described in claim 1 is preferably provided below the printing section from the viewpoint of improving the operability of the printing apparatus, but this advantage may not be desired. However, the invention is not limited to being provided below the printing unit.

As a specific example of the paper leading edge detecting means, a reflection type optical sensor is preferably used because it can stabilize a necessary detecting operation and is inexpensive, and further stabilizes the detecting operation and improves reliability ( From the viewpoint of preventing malfunction, a transmission type optical sensor (photo interrupter type photo sensor) and a light blocking member may be used. In addition, a microswitch having a mechanical contact or the like may be used as the detection unit as long as the stabilization and reliability of the detection operation are not required so much. As a specific example of the "control means" of the invention described in claim 1 and the second and third technical configurations, a microcomputer or a microprocessor is preferably used.

The delay time setting method according to the second, seventh or ninth aspect of the present invention includes a time setting method and a setting method utilizing rotation position detection of an impression cylinder by an encoder having an encoder sensor. When the control means is constituted by a microcomputer, the delay time can be set and measured by a timer built in the microcomputer. Therefore, when the control means is constituted by a microcomputer, a delay time corresponding to the type of paper stored in advance in a ROM (read-only storage device) built in the microcomputer or an external storage device. Is appropriately selected and extracted by a CPU (Central Processing Unit), so that the control means can also serve as the functional configuration of the registration drive start variable means.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention including embodiments with reference to the drawings (hereinafter, simply referred to as "embodiments").
Will be described. In the embodiments and the like, members, components, and the like having the same function, shape, and the like are denoted by the same reference numerals, and description thereof will be omitted as much as possible. In the figures, members and components that are configured as a pair and need not be specifically distinguished and described are described in order to simplify the description.
By appropriately describing one of them, the description will be replaced. In addition, in order to simplify the drawings and the description, even if the members and the components are to be shown in the drawings, the members and the components that do not need to be specifically described in the drawings may be omitted as appropriate. .

(Embodiment 1) Hereinafter, a first embodiment of the present invention (hereinafter, simply referred to as "Embodiment 1") will be described. In FIG. 1, reference numeral 100 denotes a stencil printing apparatus as an example of a printing apparatus. Reference numeral 200 denotes a bank paper feed unit as a lower paper feed unit provided in a plurality of stages below the stencil printing apparatus 100 as an example of a plurality of paper feed units in the present invention. Reference numeral 100A denotes a main body frame forming a frame on the side of the stencil printing apparatus 100, and reference numeral 200A denotes a bank paper feeding unit 2.
9 shows a bank main body frame forming a frame on the 00 side. Hereinafter, the stencil printing apparatus 100 and the bank paper feeder 20
The configuration of 0 will be described sequentially.

As shown in FIGS. 1 and 2, the stencil printing apparatus 100 has a cylindrical plate cylinder 1 for winding a master 2 made on the outer periphery,
A plate discharging section 18 for separating and storing the used master 2 wound around the plate cylinder 1 from the outer peripheral surface of the plate cylinder 1, a plate making writing section 19 disposed on the right side of the plate cylinder 1 for plate making and transporting the master 2. A document reading unit 3 disposed above the plate discharge unit 18, the plate cylinder 1, and the plate making and writing unit 19 to read a document image;
And an ink supply device 22 that supplies ink to the master 2 on the plate cylinder 1 and holds the leading end of the fed paper P that is disposed below the plate cylinder 1. An impression cylinder 20 for pressing the sheet P against the master 2 on the outer peripheral surface of the plate cylinder 1; and a paper clamper for the impression cylinder 20 disposed on the right side of the impression cylinder 20 for holding the leading end of the sheet P. 2
And a feeder including an auxiliary feeder 28 as one of a plurality of feeders according to the present invention.
And a paper discharge unit 80 disposed to the left of

FIG. 1, FIG. 2, FIG. 9 and FIG.
As shown in the figures, a support cylindrical body having a porous structure and a plurality of layers of mesh screens (not shown) wound around the outer peripheral surface thereof are rotatably supported around the support shaft 11.
The plate cylinder 1 is rotated via a drive system of the plate cylinder 1 including a main motor 150 so that the rotation speed can be changed corresponding to a plurality of printing speeds. This main motor 15
Numeral 0 is composed of, for example, a DC motor and does not transmit a driving force to a paper feed drive system as described later, and is therefore smaller than a conventional main motor.

In FIG. 2, an encoder 151 is attached to an output shaft 150a of the main motor 150. The encoder 151 is an incremental type photorotary encoder. On the side of the main body frame 100A near the encoder 151, an encoder sensor 152 composed of a transmission type optical sensor having a light emitting portion and a light receiving portion for sandwiching the encoder 151 at a predetermined interval.
Are arranged. The rotation speed of the plate cylinder 1 is detected by detecting a predetermined pulse generated in cooperation with the rotation operation of the encoder 151 by the rotation drive of the main motor 150 by the encoder sensor 152. Thus, the rotation speed of the plate cylinder 1 is controlled via the main motor 150.

On the outer peripheral surface of the plate cylinder 1, there is arranged a master clamper 12 for holding the leading end of the master 2 perforated and made by the plate making writing section 19. The master clamper 12
It faces a stage (not shown) made of a ferromagnetic material provided along a generatrix on the outer peripheral surface of the supporting cylinder, is rotatably supported via a master clamper shaft 12a, and faces the stage. The magnet is attached to the surface. When the plate cylinder 1 occupies a predetermined rotation position, the master clamper 12 is opened and closed by transmitting a driving force by an opening / closing device (not shown). At a predetermined position on the main body frame 100A side of the plate cylinder 1 facing the end plate 1a on the rear side shown in FIG. 9, the plate cylinder 1a has a home position shown in FIG. Occupied)
A home position sensor 72 for detecting the home position is provided. The home position sensor 72 is a transmission type optical sensor having a light emitting unit and a light receiving unit. A light-shielding plate 73 that selectively engages with the home position sensor 72 is provided on the end plate 1a on the back side of the plate cylinder 1 so as to protrude outward.

As shown in FIG. 2, the plate making writing section 19
A support shaft 1 for supporting a master 2 to be able to be fed out from a master roll 10 formed by being wound in a roll shape around a core tube 10a.
0b, a platen roller 9 for transporting the master 2, a thermal head 17 provided so as to be able to contact and separate from the platen roller 9, and a pair of upper and lower cutters provided on the downstream side of the platen roller 9 for cutting the master 2. Member 4 and master 2
And a pair of plate feed rollers 5a and 5b for sending the leading end of the plate toward the master clamper 12.

The platen roller 9 has its shaft rotatably supported, is driven to rotate at a predetermined peripheral speed by the pulse motor 6, and conveys the master 2 while pressing it against the thermal head 17. The thermal head 17 has a plurality of heating elements arranged in a line in the width direction of the master 2 and is provided so as to be able to freely contact and separate from the platen roller 9 by a well-known contact and separation mechanism (not shown). The thermal head 17 selectively heats and punches the master 2 based on a digital image signal processed and transmitted by the A / D converter and the plate making controller (not shown) of the document reading unit 3 to form a punched image. It has a function to do. The upper cutter member 4 is moved up and down by an eccentric cam 8 rotated by a cutter drive motor 7, and
Disconnect.

As shown in FIG. 2, the ink supply device 22 rotates in synchronization with the plate cylinder 1 in the same direction and supplies ink to the inner peripheral surface of the plate cylinder 1; It has a doctor roller 15 that is arranged in parallel with a slight gap and forms an ink reservoir 16 with the ink roller 13, and a pipe-shaped support shaft 11 that supplies ink to the ink reservoir 16. . The ink roller 13 and the doctor roller 15 are arranged in front of a side plate fixed to the support shaft 11.
Each is rotatably supported at the back. Ink pool 1
The ink supplied from 6 to the outer peripheral surface of the ink roller 13 is supplied to the inner peripheral surface of the plate cylinder 1 because a slight gap is provided between the plate cylinder 1 and the outer peripheral surface of the ink roller 13. The ink is pumped by an ink pump from an ink pack arranged at an appropriate position, and is supplied to an ink reservoir 16 through a supply hole of the support shaft 11.

In the first embodiment, the impression cylinder 20 provided with the paper clamper 21 is used as a pressing means for the purpose of improving the printing resist accuracy for the paper P, stabilizing the image density and reducing the noise during printing. The outer diameter D (diameter) of the impression cylinder 20 is, as shown in FIG.
(Diameter), and when the plate cylinder 1 makes one rotation, the impression cylinder 20 also makes one rotation. Therefore, as shown in FIG. 12, a paper clamper 21 for holding the leading end of the fed paper P can be provided on the impression cylinder 20.
The paper is fed while the leading end of the paper abuts against the paper clamper 21, thereby improving the printing registration accuracy for the paper P. The size of the impression cylinder 20 is, for example, an outer diameter D = 180 mm and a length of 300 mm. The pressing means is not limited to this, as long as the advantage of using the impression cylinder 20 described above is not required. A press roller or the like smaller than the body 1 may be used.

At the rotational position of the paper clamper 21 in the impression cylinder 20 shown in FIG. 12 (hereinafter, sometimes referred to as “paper holding position”), the leading end of the paper P is abutted against the paper clamper 21, Is closed, the leading end of the sheet P is clamped and held by the sheet clamper 21. Next, as the rotational position of the paper clamper 21 in the impression cylinder 20 sequentially changes from → to →, the paper clamper 21 is opened at the rotational position (hereinafter, sometimes referred to as “paper discharge position”), and ink is discharged from the paper cylinder. Since the leading end of the sheet P is discharged at a position beyond the rotation position where the sheet P is transferred to the sheet P, there is an advantage that the sheet P does not wind up on the plate cylinder 1 due to the adhesive force of the ink.

The end plates 20b at both ends of the impression cylinder 20 are shown in FIG.
As shown in FIGS. 7 and 8 and the like, it is fixedly supported on the impression cylinder shaft 23. The outer side of the both end plates 20b of the impression cylinder 20 is shown in FIG.
As shown in FIG. 11, a pair of arms 25a, 25b each having a bearing support 25c and a cam follower 27 comprising a bearing are provided. The impression cylinder shaft 23 is attached to these arm pairs 25a and 25b.
Are rotatably supported via bearings 23A mounted on both ends of the. Thus, the impression cylinder 20 is rotatable because both ends of the impression cylinder shaft 23 are rotatably supported by the bearing support portions 25c via the respective bearings 23A. One end of one arm 25a of the pair of arms 25a and 25b is connected to a fulcrum shaft 24a fixed to a pair of main body side plates (not shown) disposed in the apparatus main body via a bearing (not shown). Supported,
One end of the other arm 25b is rotatably supported via a bearing (not shown) at the back of the other main body side plate.
b. Both fulcrum shafts 24a and 24b are
It is provided coaxially with the arm pair 25a, 25b.

A drive gear (not shown) for transmitting rotation to the impression cylinder 20 is fixed to the inner end side of the fulcrum shaft 24b rotatably supported by the other arm 25b.
An impression cylinder gear (not shown) that meshes with the drive gear is fixed to the impression cylinder shaft 23 on the 5b side. A toothed impression cylinder pulley (not shown) for transmitting the rotational force of the plate cylinder 1 is fixed to the outer end side of the fulcrum shaft 24b. A toothed belt (not shown) is wound around a toothed plate cylinder-side pulley attached to the end plate 1a. On the other hand, another pulley is attached to the end plate 1a on the far side of the plate cylinder 1 coaxially with the plate cylinder-side pulley.
Thereby, the rotational force of the main motor 150 is transmitted to the another pulley via the toothed belt, and the plate cylinder side pulley, the toothed belt, the impression cylinder side pulley, the drive gear, the impression cylinder The impression cylinder 2 is transmitted by the gear.
0 is set so that the pressing position with the plate cylinder 1 is the same, and
The printing drum 1 is rotated counterclockwise at the same peripheral speed as that of the plate cylinder 1.

The outer peripheral portion of the impression cylinder 20 has a cylindrical portion that contacts the outer peripheral surface of the plate cylinder 1 and the master clamper 12 of the plate cylinder 1.
And a concave portion 20a which is recessed in a D-shape to avoid collision with To put it concretely, the impression cylinder 20 is made of synthetic resin for its main body to reduce the weight, and nitrile rubber is wrapped around the outer periphery of the cylindrical part. Rotation unevenness is reduced. Impression cylinder 2
A paper clamper 21 for holding and holding the leading end of the paper P is provided in the recess 20a of the zero. Paper clamper 21
Employs a clamp system using a magnet, and the base end of the paper clamper 21 is fixed to a paper clamper shaft 21a arranged in the recess 20a.
It is always biased in the closing direction by the spring 21A. The paper clamper 21 is opened at a predetermined timing by a cam (not shown), and the paper P is held on the outer peripheral surface of the impression cylinder 20 by closing after holding the leading end of the paper P. When the paper P is a plain paper, a thin paper, or the like, the front end of the paper P about 2 mm from the front end of the paper P is added by the paper clamper 21 so that the paper P is placed on the outer peripheral surface of the impression cylinder 20. Will be retained. On the other hand, when the paper P is thick paper or the like, the paper clamper 21 is not completely closed due to the clamping reaction force caused by the large stiffness of the paper P at the time of clamping, and the leading end of the paper clamper 21 is not closed. In order to prevent the ink from splashing on the master 2 or the mesh screen on the outer peripheral surface of the plate cylinder 1, the paper P is controlled so as to be rotated and transported without holding the leading end of the paper P.

The impression cylinder 20 is configured to be able to freely contact and separate from the outer peripheral surface of the plate cylinder 1 by a contact / separation means described later. The contact / separation means includes an arm pair 25a, 25b that swings the impression cylinder 20 around the fulcrum shafts 24a, 24b, and an arm pair 25a,
A pair of cam followers 27, 27 each composed of a bearing rotatably supported at the other end of 25b, a pair of printing pressure springs 26a, 26b for urging the pair of arms 25a, 25b toward the plate cylinder 1, and a pair of Cam follower 27,
27 and a pair of cams (not shown) that selectively contact each other. The pair of cams are connected to the plate cylinder 1 and the main motor 150 by a toothed belt (not shown), and are rotated in synchronization with the rotation of the plate cylinder 1. The pair of cams have a pair of cams having a pair of contoured peripheral surfaces such that the outer peripheral portions of the impression cylinder 20 except for the concave portion 20a press against a predetermined print opening area except for the portion where the master clamper 12 is provided on the plate cylinder 1. Cam follower 27,
27. When the paper P is erroneously conveyed or when making a plate, the above-mentioned pair of cams and the pair of cams are actuated by the operation of a printing pressure releasing mechanism provided with a pressure releasing solenoid (not shown) disposed on the apparatus body on the impression cylinder 20 side. By releasing the printing pressure so that the cam followers 27 and 27 do not come into sliding contact with each other, the plate cylinder 1 and the impression cylinder 20 are not pressed and the impression cylinder 2 is not pressed.
0 is separated from the plate cylinder 1 so that the impression cylinder 20 holding the sheet P is pressed against the outer peripheral surface of the plate cylinder 1 by the pair of printing springs 26a and 26b when there is no conveyance error or the like. Has become. As described above, the impression cylinder 20 moves the plate cylinder 1 around the fulcrum shafts 24a and 24b by the operation of the printing pressure release mechanism and the rotation of the pair of cams.
And a position separated from the plate cylinder 1.

The printing pressure springs 26a and 26b are
0 is applied to the plate cylinder 1 to generate a printing pressure. Impression cylinder 2
In order to uniformly apply the pressing force to the plate cylinder 1 of zero, printing pressure springs 26a and 26b are attached to each of the arm pairs 25a and 25b at both ends of the impression cylinder 20, respectively. The detailed structure of the drive system including the main motor 150 and the contact / separation means is described in, for example,
The same components as those shown in FIGS. 1 to 5 of JP-A-216448 are used.

In the vicinity of the left side of the impression cylinder 20, a paper discharge unit 80 is arranged. The paper discharge unit 80 includes a paper discharge claw 81 and a paper discharge claw 8.
The transport belt 85, which transports the paper P peeled and guided in step 1 and extends between a front 83 of the transport roller and a rear 84 of the transport roller, and a suction fan (not shown). The transport belt 85 is set to be driven by a motor or the like at a transport speed higher than the peripheral speed of the plate cylinder 1. On the left side of the paper discharge unit 80, a paper discharge table 82 on which the discharged paper P is stacked is provided.

On the right side of the impression cylinder 20, a paper feeding device including an auxiliary paper feeding unit 28 is arranged. As shown in FIGS. 1 to 4 and the like, this sheet feeding device forms a bend at the leading end of a sheet P and then forms a print formed between the outer peripheral surface of the plate cylinder 1 and the outer peripheral surface of the impression cylinder 20. A pair of upper and lower registration rollers 33a, 3 as registration means for sending out the leading end of the paper P toward the portion
3b, an auxiliary paper feeding unit 28 for feeding paper toward the pair of registration rollers 33a and 33b, and a pair of registration rollers 33a and 33a.
The leading end of the paper P fed from the bank paper feed unit 200 and provided in the vertical paper feed path RZ between the bank paper feed unit 33b and the bank paper feed unit 200 is sent out toward the pair of registration rollers 33a and 33b.
A pair of intermediate transport rollers 5 serving as a paper transport unit for forming a deflection by making contact with the pair of registration rollers 33a, 33b
5a, 55b and the pair of intermediate transport rollers 55a, 55b
Feed motor 74 as a paper transport drive unit for driving
, The auxiliary sheet feeding section 28 and the pair of registration rollers 33a, 33b
And a registration roller pair 3
3a, 33b and the paper clamper 21 of the impression cylinder 20
Sheet guide sensors 38, 39, 40 for guiding the leading end of the sheet P, and a sheet leading end sensor for detecting the leading end of the sheet P, which are disposed in the horizontal sheet feeding path RX between the auxiliary sheet feeding section 28 and the pair of registration rollers 33a, 33b. 51, the impression cylinder 20, the registration roller pair 33a,
The registration sensor 5 is disposed in the horizontal sheet feeding path RX between the sheet sensor 33b and a sheet leading edge detecting unit for detecting the leading edge of the sheet P.
2 is provided.

As shown in FIGS. 1 to 4 and the like, the auxiliary paper feeding section 28 is provided with an auxiliary tray 31 as a paper feeding table on which the paper P can be stacked and vertically moved, and a paper P on the auxiliary tray 31. Paper feeding means 29 for separating the paper P one by one and feeding the leading edge of the paper P toward the pair of registration rollers 33a, 33b, and a paper feeding front plate 35 for abutting and aligning the leading edge of the paper P stacked on the auxiliary tray 31 Is provided. Registration roller pair 33
The drive of a and 33b employs a registration roller independent drive system which is rotated by a registration motor 58 independent of the rotational drive force of the main motor 150, instead of the sector gear system which is a conventional drive system.

The paper feeding means 29 has a function of feeding paper toward the pair of registration rollers 33a and 33b. The paper feeding means 29 includes the above-described calling roller 30, which is also called a pickup roller or a pickup roller, a separation roller 32, and a separation pad. The driving of the paper feeding unit 29 is performed in place of the sector gear system which is a conventional driving system of the paper feeding unit.
A paper feeding unit independent driving system rotated by a paper feeding motor 74 independent of the rotational driving force of the main motor 150 is adopted.

The auxiliary tray 31 includes a driving device (not shown)
As a result, the highest level of the stacked paper P is raised and lowered so as to always contact the call roller 30 with a predetermined pressing force (a pressing force capable of conveying the paper P). The auxiliary tray 31
It has a structure that allows manual paper feeding, and the type of paper (hereinafter referred to as
(Sometimes referred to as “paper type”), and a structure capable of stacking 500 sheets of paper P of paper size A3 or A4. The structure capable of manual sheet feeding is described in, for example, Japanese Utility Model 5-18.
No. 342, and the like. As shown in FIG. 3 and FIG. 14, a pair of side fences 43a and 43b for positioning and aligning both side edges of the sheet P according to the sheet size are arranged on the auxiliary tray 31 so as to be movable in the sheet width direction Y. ing. FIG. 14 shows a paper size detection mechanism. This paper size detection mechanism determines the paper size of the paper P in conjunction with the movement of the pair of side fences 43a and 43b in the paper width direction Y. The paper size detection mechanism includes a pair of side fences 43a and 43a.
b, a pinion 46 rotatably mounted on and supported by an immovable member disposed below the auxiliary tray 31, and a pinion 46 formed at the lower edge of the side fence 43a.
And a pinion 4 formed at the lower edge of the side fence 43b so as to face the rack 45.
6 and a closing part provided with a plurality of notches, which are bent downward and protruded from the lower edge portion of the side fence 43b facing the rack portion 44 and are cut out at appropriate intervals. 44a and the closing part 44a fixedly mounted on the stationary member of the
And two vertical size detection sensors 48a and 48b, which selectively engage with each other, and a vertical size detection sensor 49 fixedly provided at an appropriate interval in the horizontal sheet feeding direction X of the stationary member of the auxiliary tray 31. It is mainly composed.

Each of the horizontal size detection sensors 48a and 48b is
This is a transmission type optical sensor having a light emitting unit and a light receiving unit, and detects the size of the sheet P in the sheet width direction Y by selectively engaging with the shielding unit 44a. The vertical size detection sensor 49 is a reflection type optical sensor,
The size of the paper P in the horizontal paper feeding direction X is detected. Each of the horizontal size detection sensors 48a and 48b and the vertical size detection sensor 49 constitute an auxiliary paper feed unit paper size detection sensor group 50, and combine the size signal data detected by these paper size detection sensor groups 50. The sheet P is determined by the CPU of the main body sheet feeding control device described later.
Is determined. The details of such a paper size detection method include a technique proposed by the applicant of the present application and disclosed in, for example, Japanese Patent Application Laid-Open No. 9-30714. The paper size detection method is not limited to the method described above, and it goes without saying that another method may be used. Further, a detection mechanism similar to the paper size detection mechanism of the auxiliary tray 31 is also provided at a tray upper 143 and a tray lower 145, which will be described later, of the bank paper feed unit 200, respectively. I do. That is, the paper size detection sensor group on the bank of the paper size detection mechanism on the tray upper 143 is denoted by reference numeral 50-1, and the tray lower
In FIG. 5, the group of paper size detection sensors below the bank of the paper size detection mechanism will be distinguished as 50-2.

The horizontal sheet feeding path RX is provided on each of the guide plates 38 and 3 arranged as shown in FIGS. 2, 4 to 6 and the like.
It is formed in a substantially horizontal state in the space defined by 9, 40. The upstream end of the guide plate 38 in the horizontal paper feeding direction X is curved upward, and the leading end of the paper P fed downstream by the paper feeding means 29 in the horizontal paper feeding direction X is set to the registration roller pair 33a. , 33b guides the leading end of the paper P so as to form a curved predetermined flexure PA as shown in FIG.

On the other hand, the guide plate 40 is bent downward and diagonally downward from the horizontal paper feed path RX near the registration roller pair 33a, 33b arrangement portion, and is disposed opposite to the intermediate guide plate 41, In the space defined with 42,
The upper part of the vertical paper feed path RZ is formed. Opposite one ends of the intermediate guide plates 41 and 42 are formed to be curved in a mountain shape, and a plurality of later-described sheet feeding units 29-1 and 29-2 in the bank sheet feeding unit 200 are used. When the leading end of the sheet P fed downstream in the vertical sheet feeding direction Z via the roller group abuts on a portion immediately before the nip portion of the pair of registration rollers 33a and 33b, a curved deflection PA as shown in FIG. The leading end of the sheet P is guided so as to form

In the upper portion of the vertical paper feed path RZ between the pair of registration rollers 33a, 33b and the bank paper feed unit 200, each paper feeding means 29-described later in the bank paper feed unit 200 is provided.
The leading edge of the sheet P fed from the feed roller 1, 29-2 is sent out toward the pair of registration rollers 33a, 33b, and the leading end of the sheet P is brought into contact with the pair of registration rollers 33a, 33b.
More specifically, a pair of intermediate transport rollers 55a and 55b that form a flexure PA by abutting against a portion of the pair of registration rollers 33a and 33b immediately before the nip portion is provided. The intermediate transport roller 55a shown on the right side in FIGS. 2 and 4 is a driving roller as shown in FIGS. 3 and 4, and is a three-piece roller integrally attached to the roller shaft 55c for the purpose of reducing wrinkling of thin paper. Consists of a saw-shaped roller. The intermediate transport roller 55b is a driven roller that is constantly pressed against the intermediate transport roller 55a by a biasing unit such as a spring, and includes three chopped rollers (not shown in FIG. 3). The roller shaft 55c and the roller shaft (not shown) on the side of the intermediate conveyance roller 55b are provided to extend between the main body side plate front 89a and the main body side plate 89b disposed on the stencil printing apparatus 100 main body side. Before the main body side plate
It is rotatably supported by the back 89a, 89b via each rolling bearing 86, respectively.

Referring to FIGS. 3 and 4, a description will be given of a roller switching drive system for switching between the intermediate transport rollers 55a and 55b and the paper feeding means 29, including a more detailed structure of the paper feeding means 29. FIG. One-way clutches 67 are interposed between the separation roller 32 and the shaft 32a and between the ring roller 30 and the shaft 30a, respectively. A toothed pulley 32A is mounted on a shaft 32a of the separation roller 32, and a toothed pulley 30A is mounted on a shaft 30a of the retrieving roller 30, respectively. A timing belt 37 is stretched over the pulley 32A and the pulley 30A, and the calling roller 30 and the separation roller 32 are in a driving force transmission relationship via the timing belt 37. The clutch locking direction (connection direction of the rotational driving force) of each one-way clutch 67 is indicated by an arrow in the drawing in which the call roller 30 and the separation roller 32 are rotated to separate and feed the paper P one by one. Clockwise. Thus, the call roller 30 and the separation roller 32 can rotate only in the clockwise direction. The shaft 30a of the call roller 30 and the shaft 32a of the separation roller 32 are both rotatably mounted via a rolling bearing 87 to a U-shaped paper feed arm 35A having an opening on the lower side. The call roller 30 is swingable by a predetermined angle about the axis 32a of the separation roller 32 by its own weight and the weight of the sheet feeding arm 35A. Shaft 3 of separation roller 32
As shown in FIG. 3, 2a extends outside the main body side plate 89b and is rotatably supported by the main body side plate 89b via a rolling bearing 86. A toothed driven pulley 56 is fixedly provided at an end of the shaft 32a extending outside the main body side plate depth 89b. A one-way clutch 56A is interposed between the driven pulley 56 and the shaft 32a. The clutch locking direction (connection direction of the rotational driving force) of the one-way clutch 56A is set so that the shaft 32a can be rotated only clockwise in FIG.

The paper feeding motor 74 is composed of a stepping motor, has a function as a paper feeding driving means for rotating the separation roller 32 and the calling roller 30, and a paper feeding driving means for rotatingly driving the pair of intermediate conveyance rollers 55a and 55b. It also has the function as The feed motor 74 is shown in FIG.
4, as shown in FIG. 4, it is fixed to a motor bracket 74A which is attached and fixed to the inner side plate 89b via screws. Toothed drive pulleys 75a and 75b composed of two pulleys are fixed to the output shaft of the paper feed motor 74, respectively. Driven pulley 56 and drive pulley 75b
And a timing belt 57 is stretched between them to establish a driving force transmission relationship. In the vicinity of the drive pulley 75a, a transport drive gear 78 fixed to the shaft 76a,
and a toothed driven pulley 76 attached to a. Driven pulley 76 and drive pulley 75a
, The timing belt 77 is stretched over, and is in a driving force transmission relationship. At one end of the roller shaft 55c of the intermediate conveyance roller 55a, a conveyance driven gear 79 that always meshes with the conveyance drive gear 78 is fixed. A one-way clutch 79 is provided between the roller shaft 55c and the conveyance driven gear 79.
A is interposed. The clutch locking direction of the one-way clutch 79A (connection direction of the rotational driving force) is set in a clockwise direction in which the intermediate transport roller 55a transports the sheet P via the transport driven gear 79.

Here, the operation of the roller switching drive system will be described in detail for convenience of explanation. In the case of paper feeding from the auxiliary paper feeding unit 28, by rotating the paper feeding motor 74 forward in the clockwise direction in FIG. 4, the rotational driving force of the paper feeding motor 74 is
7. The driven pulley 56 is transmitted to the shaft 32a by the clutch locking action of the one-way clutch 56A, and then the separation roller 32 is rotated clockwise by the clutch locking action of the one-way clutch 67. At the same time, the rotational driving force of the feed motor 74 transmitted from the shaft 32a to the pulley 32A is transmitted to the pulley 30A and the shaft 30a via the timing belt 37, and the one-way clutch 67 performs the clutch locking operation to cause the call roller 30 to rotate.
Rotates clockwise. Thereby, the separation roller 3
2 and the call roller 30 are both rotated clockwise, and the uppermost sheet P stacked on the auxiliary tray 31 is fed toward the pair of registration rollers 33a and 33b. At this time, the rotational driving force of the paper feed motor 74 is transmitted from the drive pulley 75a to the timing belt 77, the driven pulley 76, the transport drive gear 78, and the transport driven gear 79, but the transport driven gear 79A is operated by the one-way clutch 79A. Since the idle rotation occurs at 79, the rotational driving force of the paper feed motor 74 is not transmitted to the pair of intermediate transport rollers 55a and 55b.

On the other hand, in the case of paper feeding from the bank paper feeding unit 200, by rotating the paper feeding motor 74 in the counterclockwise direction in FIG. , The timing belt 77, the driven pulley 76, the transport drive gear 78, and the transport driven gear 79, and then the rotational driving force is transmitted to the roller shaft 55 c by the clutch locking action of the one-way clutch 79 A, whereby the intermediate transport roller 55 a Is rotated clockwise, and the intermediate transport roller 55b pressed against the roller rotates counterclockwise. As a result, the paper P fed from the bank paper feed unit 200 is
The rotation of the registration rollers 33a,
33b. At this time, the timing belt 57, the driven pulley 5
Up to 6, the rotation driving force of the paper feed motor 74 is transmitted to rotate in the counterclockwise direction. However, the driven pulley 56 idles due to the action of the one-way clutch 56A on the driven pulley 56 side. No force is transmitted to the shaft 32a, so that the separation roller 32 and the recall roller 30 do not rotate.

As described above, the sheet conveyance driving means for driving the pair of intermediate conveyance rollers 55a and 55b and the sheet feeding driving means are constituted by the sheet feeding motor 74 as a single driving means. , 55b and paper feeding means 29
The separation roller 32 and the recall roller 30 are driven to rotate only by performing a forward / reverse switching operation by a single sheet feeding motor 74. Therefore, as described in, for example, JP-A-6-40137, there is no need to rotate the intermediate conveying roller pair and the separation roller and the call roller of the paper feeding means by two separate drive motors. There is an advantage that there is no layout restriction for arranging the drive motor, and space and cost can be reduced.

Sheet edge sensor 51 and intermediate transport roller pair 5
An intermediate sensor upper 53 for detecting the leading end of the sheet P is disposed on the intermediate guide plate 42 on the vertical sheet feeding path RZ between the first and second sheets 5a and 55b and just before the bending section. The lower end of the intermediate guide plate 42 is located on the vertical paper feed path RZ between the pair of intermediate transport rollers 55a and 55b and the pair of bank registration rollers 106a and 106b disposed on the bank paper feed unit 200 side. An intermediate sensor lower 54 for detecting the leading end of the paper P is provided. Upper and lower 53, 54 of these intermediate sensors
Consists of a reflection type optical sensor having a light emitting unit and a light receiving unit. As shown in FIG. 5, the intermediate guide plate 42 has an opening through which light emitted from the light emitting unit and light reflected from the front end surface of the sheet P pass. The upper intermediate sensor 53 detects the leading end of the sheet P,
It has a jam detecting function of detecting a jam of the sheet P generated in the upstream vertical sheet feeding path RZ including the pair of intermediate conveying rollers 55a and 55b. The intermediate sensor lower 54 detects the leading end of the sheet P, and within a predetermined time, the bank sheet feeding unit 200
And a jam detection function of detecting whether or not paper P has been fed from the vertical feeding path RZ upstream of the pair of intermediate transport rollers 55a and 55b.

The registration motor 58 is composed of a stepping motor and has a function as registration driving means for rotating and driving the registration roller 33b. As shown in FIG. 4, the registration motor 58 includes a driving pulley 58A provided on an output shaft of the registration motor 58 and a registration roller 33.
b is connected to a registration roller 33b via a timing belt 59 stretched over a registration driven pulley 33A provided on a shaft 33c of FIG. Drive pulley 58
A and the resist driven pulley 33A are toothed pulleys that engage with the timing belt 59 without slipping.

As shown in FIG. 10, the upper registration roller 33a is provided with a roller shaft 33 for the purpose of reducing wrinkles of thin paper.
c, and is inserted into the central three opening portions 38a of the five opening portions 38a formed in the upper guide plate 38 with an appropriate gap. ing. The registration roller 33a is
A registration roller 33b composed of five chopped rollers (FIG. 1)
0 (not shown).

As shown in FIGS. 1 and 10, the paper leading edge sensor 51 is provided on the upper guide plate 38 at a position 19 mm upstream from the center of the roller shaft 33c in the paper transport direction X. Attached to. Similarly,
The registration sensor 52 is, for example, a roller shaft 3.
3c is attached to the upper guide plate 38 at a position 19 mm downstream from the center of the sheet 3c in the sheet transport direction X. Each of these sensors 51 and 52 is a reflection type optical sensor having a light emitting unit and a light receiving unit. Upper guide plate 38
5 and 6, an opening through which light emitted from the light emitting unit and light reflected from the front end surface of the sheet P pass is opened.

The paper leading edge sensor 51 detects a leading edge of the paper P to detect a jam of the paper P occurring on the upstream side in the horizontal paper feeding direction X and the vertical paper feeding direction Z including the paper feeding means 29. In addition to having a detection function, the registration roller pair 33
It also has a part of the function of adjusting the amount of flexure when the flexure PA is formed by abutting the leading end of the paper P against the portion immediately before the nip portion of the a and 33b. The registration sensor 52 detects the leading edge of the sheet P, and thereby, the registration roller pair 33a,
It has a jam detection function of detecting a jam of the sheet P that has occurred on the upstream side in the horizontal sheet feeding direction X and the vertical sheet feeding direction Z including 33b.

The registration roller up-down mechanism has one end attached to both ends of the roller shaft 33c.
Roller arms 33d, 33 for swingably supporting
d, a swing support shaft 36 attached to the other end of each of the roller arms 33d, 33d and rotatable by a predetermined angle, and a swing support shaft 36.
A pressure release cam follower (not shown) provided with a bearing attached to a rear end of the main body; And a spring (not shown) for urging the registration roller 33a in a direction of pressing the registration roller 33b against the lower registration roller 33b. The rotational driving force of the registration roller opening / closing cam is obtained from the rotational driving force of the main motor 150 for rotating the plate cylinder 1 via a rotation transmitting member such as a gear. If it is desired to further reduce the load on the motor 150, the control may be performed by an electric driving force such as a solenoid or a stepping motor instead of the mechanical registration roller up / down mechanism.

Here, the rotation positions of the plate cylinder 1 and the impression cylinder 20 during the transport of the sheet P (during the paper feeding step) are represented as follows. That is, in FIGS. 13 (a) and 13 (b), the rotational position of the plate cylinder 1 is changed from the home position of the plate cylinder 1 shown in FIG. As shown in FIG. 13A, the rotational position of the impression cylinder 20 is
a represents the angle θ ′ formed when the impression cylinder 20 rotates counterclockwise from the home position of the impression cylinder 20 located immediately above the master clamper 12 of the plate cylinder 1 and facing the master clamper 12. In addition, the plate cylinder 1 and the impression cylinder 20 are detachable from the apparatus main body when occupying each home position.

The operation of the registration roller up / down mechanism will be described in advance. At the timing of turning on the registration pressure when the upper registration roller 33a is pressed against the lower registration roller 33b, the plate cylinder 1 occupies the rotational position θ = 257.5 ° as shown in FIG. ON when the plate cylinder 1 is rotated at the rotational position θ = 57.5 ° (417.5 °)
Is switched from ON to OFF (resist pressure is released) when occupied. The leading end of the paper P is an impression cylinder 2
After that, the registration roller opening / closing cam rotates, and the bearing of the pressure release cam follower slides and is positioned on the convex portion of the registration roller opening / closing cam. The upper registration roller 33a is lifted against the lower registration roller 33b. This separation operation is continued until the trailing end of the paper P completely passes through the gap between the pair of registration rollers 33a and 33b due to the sliding contact engagement time between the convex portion of the registration roller opening / closing cam and the bearing of the pressure release cam follower. Is set to

Next, a detailed configuration of the bank paper feed unit 200 will be described. As shown in FIG. 1, the bank paper feed unit 200 is detachably provided below the main body frame 100A via the bank main body frame 200A. The bank paper feeding unit 200 includes an upper bank paper feeding unit 201 as an upper paper feeding unit and a lower bank paper feeding unit 202 as a lower paper feeding unit provided in the bank main body frame 200A, and a guide plate described later. A lower portion of the formed vertical paper path RZ;
A pair of bank registration rollers 106a and 106b, a bank registration sensor 135, and a pair of intermediate rollers 118a and 118b are arranged in order from the top of the vertical paper feed path RZ.
And a bank feed sensor 136.

The on-bank paper feeder 201 is shown in FIGS.
As shown in FIG. 5, the tray 143 which can be moved up and down between the upper limit position where a plurality of sheets of paper P are stacked and raised to face the sheet feeding position and the lowermost position where the plurality of sheets P are lowered, and the tray upper 143 are kept horizontal. Meanwhile, the upper tray unit 144 provided with a horizontal raising / lowering means (not shown) for raising and lowering the bank between the upper limit position and the lower limit position, and the upper limit position of the uppermost sheet P stacked on the tray 143. A bank upper / lower limit sensor 137 for detecting, a bank upper / lower limit sensor 138 for detecting the lower limit position of the tray upper 143, and a paper feed for separating the sheets P on the tray 143 one by one and feeding them in the horizontal paper feeding direction X1. Means 29-1 and paper size detection sensor group 50 on the bank
-1 provided with the above-described paper size detection mechanism.

The upper tray 143 is made of sheet metal, and is placed in the horizontal sheet feeding direction X with respect to the bank body frame 200A.
1 and 15 perpendicular to FIG. 1 as components of the upper tray unit 144 which can be inserted into and removed from the front and back of the paper surface in FIGS. 144 on the tray unit
Has an on-tray storage housing 144A in a general housing shape for assembling other components such as the upper tray 143 and the like. The paper feeding means 29 is provided in the storage case 144A on the tray.
Of paper P stacked on tray 143 below -1
A paper feed front wall 144a for aligning the leading ends of the paper is formed. In the first embodiment, the sheet sizes that can be stacked on the tray 143 are two sizes of A3 and A4, and are configured so that 1000 sheets of plain paper can be stacked and stored. Paper sizes other than the above-mentioned sizes can be loaded and accommodated, if necessary, according to the application and necessity.

Incidentally, the upper tray unit 144 of the upper bank paper feed unit 201 is not limited to this, and is described in, for example, JP-A-5-12.
No. 4737, JP-A-5-221536, JP-A-6-1
The paper feeder disclosed in Japanese Patent Application Laid-Open No. 44600/1995 and Japanese Patent Application Laid-Open No. 7-137851 may be used. These paper feeders use a front-loading system that allows operators and others to perform paper feed and other operations in a position facing the front of the device, and also allow automatic paper replenishment without interrupting the paper feed operation. This is a sheet feeding device that can be used by switching between so-called tandem sheet feeding and non-tandem sheet feeding.
Further, the present invention is not limited to the above-described paper feeder, and a new paper feeder as proposed by the present applicant in Japanese Patent Application No. 10-199188 in order to improve each of the paper feeders, that is, a lifting / lowering device for loading a plurality of sheets. A first paper feed tray, a paper feed means for feeding paper from the first paper feed tray in the paper transport direction, and a second paper feed tray which is arranged substantially horizontally with respect to the first paper feed tray to load a plurality of papers. A second paper feed tray, and transfer means for transferring the paper in the second paper feed tray to the first paper feed tray at a time. In a sheet feeding device capable of loading large-size sheets larger than a sheet size that can be stacked on the sheet feeding tray or the second sheet feeding tray and feeding the sheets by the sheet feeding unit, the first sheet feeding tray is set to a substantially horizontal state. Horizontal elevating means for raising while maintaining, a first paper tray and a second A sheet feeder comprising: a lifting / lowering interlocking unit that raises the second paper feed tray while keeping the second paper feed tray in a substantially horizontal state in conjunction with at least the raising operation of the first paper feed tray when large-size paper is stacked on the trays It may be a device. 1 and 15, the upper tray unit 144 and the upper tray 143 are indicated by a two-dot chain line to show the outline of the tandem sheet feeding.

The upper bank sensor 137 is connected to the sheet feeding means 2.
It is detected that the call-in roller 30 of 9-1 occupies an appropriate sheet supply position for contacting the uppermost sheet P stacked on the tray 143 with an appropriate pressure and feeding a sheet. The upper-bank sensor 137 is a light-shielding type optical sensor having a light-emitting portion and a light-receiving portion, and is a contact piece (not shown) that swingably contacts the uppermost sheet P stacked on the tray 143. ) Is provided on the sheet feeding arm 35A shown in FIG. 4, and a light shielding plate (not shown) provided in conjunction with the contact piece performs a light shielding operation between the light emitting portion and the light receiving portion. , For detecting the paper feed position. Upper bank sensor 137
Is provided on the bank body frame 200A side near the call roller 30 of the paper feeding unit 29-1. The on-bank upper limit sensor 137 has the same configuration as the optical sensor PS2 shown in, for example, FIG. 3 of JP-A-2-265825. The bank upper / lower limit sensor 138 is a reflection type optical sensor having a light emitting unit and a light receiving unit, and is arranged at a predetermined position in the bank main body frame 200A. The bank upper and lower limit sensor 138 detects the lower limit position of the tray upper 143 by emitting light from the light emitting unit to one side surface of the tray upper 143 and detecting the reflected light by the light receiving unit.

The lower bank paper feeder 202 is provided in FIG. 1 and FIG.
As shown in FIG. 5, the lower tray 145 and the lower tray 145 which can be raised and lowered between an upper limit position where a plurality of sheets of paper P are stacked and raised to face the sheet feeding position and a lowermost position where the plurality of sheets P are lowered, are kept horizontal. The lower tray unit 146 provided with a horizontal lowering unit (not shown) for raising and lowering the bank between the upper limit position and the lower limit position, and the upper limit position of the uppermost sheet P stacked on the tray lower 145. A lower bank upper limit sensor 139 for detecting, a lower bank lower limit sensor 140 for detecting the lower limit position of the tray lower 145, and a paper feed for separating the paper P of the tray lower 145 one by one and feeding the paper P in the horizontal paper feeding direction X1. Means 29-2 and a paper size detection sensor group 50 under the bank
-2 described above.

The lower tray 145 is formed of sheet metal, and is positioned in the horizontal sheet feeding direction X with respect to the bank body frame 200A.
1 and 15 perpendicular to FIG. 1 as a component of a tray unit lower 146 that can be inserted into and removed from the front and back of the paper. Lower tray unit 146
Has a generally housing-like lower housing 146A for assembling other components such as the lower tray 145 and the like. The paper storage means 29-
2, a paper feed front wall 146a is formed to align the leading ends of the sheets P stacked on the lower tray 145. In the first embodiment, the paper sizes that can be stacked on the lower tray 145 are two sizes, A3 and A4.
It is configured so that 00 sheets can be loaded and stored. Paper sizes other than the above-mentioned sizes can be loaded and accommodated, if necessary, according to the application and necessity.

The lower bank upper limit sensor 139 is connected to the sheet feeding unit 2.
9-2 to detect that the call roller 30 of 9-2 occupies an appropriate sheet supply position to contact the uppermost sheet P stacked on the lower tray 145 with an appropriate pressure and feed the sheet.
It has the same configuration as the upper bank sensor 137.
The lower bank upper limit sensor 139 is provided on the bank main body frame 200A side near the call roller 30 of the paper feeding unit 29-2. The bank lower / lower limit sensor 140 is disposed at a predetermined position in the bank main body frame 200A, and detects the lower limit position of the tray lower 145 by the same configuration and operation as the bank upper / lower limit sensor 138.

The above-bank horizontal raising / lowering means is an on-bank vertical moving motor 141 as a driving means shown only in FIG.
For example, a wire-type lifting mechanism similar to that disclosed in FIGS. 3 and 4 of JP-A-6-40137 is adopted. The below-bank horizontal lifting / lowering means includes a below-bank vertical moving motor 142 as a driving means shown only in FIG. Bank up / down motor 141 and bank down / up motor 142
Consists of a DC motor. In addition, Japanese Patent Application No. Hei 10-1991
A pantograph-type elevating mechanism using an X-arm in the novel sheet feeding device proposed in No. 88 may of course be used.

Although the description has been made before and after, the auxiliary sheet feeding section 28
On the side of the auxiliary tray 31, the same lifting means as the horizontal lifting means below the bank are provided, and the same sensors as the upper bank lower sensor 139 and the lower bank sensor 140 are provided. The elevating operation and the elevating control are performed.

In FIG. 15, the lower portion of the vertical paper feed path RZ includes a guide plate 40 and an intermediate guide plate 42 on the stencil printing apparatus 100 side (hereinafter, may be simply referred to as “main body side”).
A pair of connection guide plates 1 provided to be connected to the lower end of the
27, 127 and the sheet feeding means 29 of the bank upper sheet feeding unit 201.
-1, and a pair of upper guide plates 128, 128 formed to enable paper feeding from -1.
8 and a pair of lower guide plates 129, 129 formed so as to be able to feed paper from the paper feeding means 29-2 of the lower bank paper feeding unit 202. The vertical sheet feeding path RZ where the pair of connecting guide plates 127, 127, the upper pair of guide plates 128, 128 and the lower pair of guide plates 129, 129 join.
The bank registration roller pair 106a, 1 is located downstream of each of the paper feeding means 29-1 and 29-2 in the vertical paper feeding direction Z.
06b is rotatably disposed.

Bank registration roller pair 106a, 106
b is specific to the bank paper feed unit 200,
Paper P reaching registration roller pair 33a, 33b on the main body side
This is provided to prevent skew, wrinkles, and lateral registration deviation that occur due to a long transport path. The bank registration roller pair 106a, 106b is compared with the registration roller pair 33a, 33b on the main body side.
By slightly biting the leading end of the fed sheet P, the sheet P is operated so as to prevent the sheet P from dropping due to its own weight.
The main difference is that the apparatus is not provided with a resist pressure release mechanism such as 33b and is always in a pressure contact state by a spring (not shown).

Bank registration roller pair 106a, 106
A bank registration sensor 135 is provided in the vertical paper feed path RZ at the merging section upstream of b. The bank resist sensor 135 is a reflection-type optical sensor having a light emitting unit and a light receiving unit. Bank resist sensor 13
5 detects the leading edge and the trailing edge of the paper P,
Within a predetermined time, the pair of bank registration rollers 106a, 106a
6b, it is detected whether or not the leading edge of the sheet P is located at the position where the sheet registration roller 6b is located.
It has a jam detection function of detecting a jam of the paper P that has occurred in the vertical paper feed path RZ on the upstream side.

In the vertical paper feed path RZ between the paper feed means 29-1 and the paper feed means 29-2, a pair of intermediate rollers 118a, 118
b is rotatably arranged. Intermediate roller pair 118
Reference numerals a and 118b convey the sheet P fed from the sheet feeding unit 29-2 to the downstream side of the vertical sheet feeding path RZ. A bank feed sensor 136 is provided on the upstream side of the vertical paper feed path RZ near the pair of intermediate rollers 118a and 118b. The bank feed sensor 136 is a reflection type optical sensor having a light emitting unit and a light receiving unit. The bank feed sensor 136 detects the leading edge and the trailing edge of the sheet P, and within a predetermined time, the intermediate roller pair 118a,
In addition to detecting whether or not the leading end of the sheet P is located at the portion where the sheet P 118b is located, the sheet feeding means 29-2 sends the intermediate roller pair 11
It has a jam detection function of detecting a jam of the paper P that has occurred in the vertical paper feed path RZ reaching the position where the 8a and 118b are arranged.

FIG. 16 shows a bank paper feed drive mechanism 125 for feeding paper from the bank paper feed unit 200. The bank paper feed drive mechanism 125 includes a bank registration roller pair 106.
a, 106b, a bank registration roller driving mechanism 125A, a separation roller 32 and a call roller 30, or an intermediate roller pair 118a, 1 on the paper feeding unit 29-1 side.
18b, a bank upper / lower paper feeding section switching drive mechanism 125B for switching and driving the separation roller 32 and the call roller 30 on the paper feeding means 29-2 side. In addition, in FIG. 16, the rotation direction of each component refers to the direction when viewed from the right side in FIG.

Bank registration roller drive mechanism 125A
Is a forward / reverse rotatable bank registration motor 101 for driving the pair of bank registration rollers 106a and 106b;
A drive gear 102 fixed to the output shaft of the bank registration motor 101 for transmitting the rotational driving force of the bank registration motor 101 to the shaft 106c of the bank registration roller 106b, an idle gear 103 meshing with the drive gear 102, and A gear train including a driven gear 105 meshing with the idle gear 103, and a bank registration motor 10 interposed between the driven gear 105 and the shaft 106c of the bank registration roller 106b and transmitted to the driven gear 105.
And a registration clutch 104 for connecting and disconnecting one rotational driving force.

The bank registration motor 101 comprises a stepping motor. The idle gear 103 is rotatably supported by a bank side plate 126 with a shaft. The shaft 106c of the bank registration roller 106b is rotatably supported by the bank side plate 126 via a rolling bearing (not shown). The registration clutch 104 includes an electromagnetic clutch.

[0086] Bank upper and lower paper feed section switching drive mechanism 125B
Is a separation roller 32 and a pickup roller 30 on the side of the sheet feeding means 29-1, or a pair of intermediate rollers 118a and 118b;
Forward / reversely rotatable bank paper feed motor 1 for rotatingly driving separation roller 32 and call roller 30 on paper supply means 29-2 side
07 and the rotational driving force of the bank paper feed motor 107 during normal rotation (clockwise) is applied to the separation roller 3 on the paper feeder 29-1 side.
An upper gear train to be transmitted to the second shaft 32a,
A one-way clutch 11 interposed between a shaft of the intermediate gear pair 109a and 109b and a drive pulley 110 provided coaxially and having a direction of clutch lock in a clockwise direction.
0A and the rotational driving force of the bank paper feeding motor 107 during the reverse rotation (counterclockwise direction) of the shaft 118c of the intermediate roller 118b.
And a middle gear train (described later) for transmission to the
Between the drive pulley 110 and the driven pulley 119, and between the drive pulley 110 and the driven pulley 119, interposed between the shaft 118c of the 18b and the driven gear 116 to disconnect and connect the rotational driving force of the bank feed motor 107 transmitted to the driven gear 116. The timing belt 118 </ b> A stretched over and the timing belt 118
A: a lower gear train, described below, for transmitting the rotational driving force of the bank paper feed motor 107 transmitted to A during the reverse rotation (counterclockwise direction) to the shaft 32a of the separation roller 32 on the paper feeder 29-2 side; The shaft 32 of the separation roller 32 on the paper feeding unit 29-2 side
and a paper feed clutch 123 interposed between the driven gear 122 and the driven gear 122 for connecting and disconnecting the rotational driving force of the bank paper feed motor 107 transmitted to the driven gear 122.

The upper gear train includes a bank paper feed motor 10
7, an intermediate gear 109a meshed with the drive gear 108, a drive pulley 110 and an intermediate gear 109b provided coaxially with the intermediate gear 109a, and an intermediate gear 109b. The idle gear 111 meshes with the idle gear 111, the idle small diameter gear 112a meshed with the idle gear 111, and the idle large diameter gear 112 provided coaxially with the idle small gear 112a.
b, and a driven gear 113 fixed to the end of the shaft 32a of the separation roller 32 on the side of the sheet feeding means 29-1, which meshes with the idle large-diameter gear 112b. Intermediate gear pair 109
a, 109b, the idle gear 111, the idle small diameter gear 112a, and the idle large diameter gear 112b are rotatably supported on the bank side plate 126 with their respective shafts. The shaft 32a of the separation roller 32 on the paper feeding unit 29-1 side
Is connected to the bank side plate 126 via a rolling bearing (not shown).
It is supported rotatably. The middle gear train includes an idle small-diameter gear 114a that meshes with the drive gear 108, an idle large-diameter gear 114b provided coaxially with the idle small-diameter gear 114a, and an idle large-diameter gear 114b.
And an idle gear 115 meshing with the idle gear 1
15 and a driven gear 116 fixed to the end of the shaft 118c of the intermediate roller 118b. The idle small diameter gear 114a, the idle large diameter gear 114b, and the idle gear 115
6 rotatably supported. The shaft 118c of the intermediate roller 118b is rotatably supported by the bank side plate 126 via a rolling bearing (not shown).

The lower gear train includes an intermediate gear 120 provided coaxially with the driven pulley 119,
, An idle large-diameter gear 121b provided coaxially with the idle small-diameter gear 121a, and a shaft of the separation roller 32 on the sheet feeding means 29-2 side meshed with the idle large-diameter gear 121b. And a driven gear 122 fixedly provided at an end of the driven gear 122a. The intermediate gear 120, the idle small-diameter gear 121a, and the idle large-diameter gear 121b each have a shaft and a bank side plate 126.
It is supported rotatably. The shaft 32a of the separation roller 32 on the paper feeding unit 29-2 side is rotatably supported by the bank side plate 126 via a rolling bearing (not shown).

The bank paper feeding motor 107 is composed of a stepping motor. The intermediate clutch 117 and the paper feed clutch 123 are each composed of an electromagnetic clutch.

Here, the bank upper / lower sheet feeding section switching drive mechanism 1
The operation of 25B will be described. In the case of paper feeding from the paper feeding unit 29-1 of the bank upper paper feeding unit 201, the bank paper feeding motor 107 is rotated forward, for example, clockwise in FIG. The force is transmitted to the sheet feeding means 29 through the transmission by the upper gear train.
3 and 4 are transmitted as a driving force for rotating the shaft 32a of the separation roller 32 on the -1 side in the clockwise direction.
, The separation roller 32 and the invocation roller 30 are rotated clockwise. As a result, only one of the uppermost sheets P stacked on the tray 143 is fed toward the pair of registration rollers 33a and 33b. At this time, the intermediate gear 109a is rotated in the counterclockwise direction, so that the intermediate gear pair 109a, 109
Since only the shaft b rotates counterclockwise, the rotational driving force of the bank paper feed motor 107 is not transmitted to the drive pulley 110.

On the other hand, the sheet feeding means 2 of the bank lower sheet feeding section 202
In the case of paper feeding from 9-2, the bank paper feeding motor 107
16, the intermediate gear 109a is rotated clockwise, and the shaft of the intermediate gear pair 109a, 109b and the drive pulley 110 are rotated by the clutch locking action of the one-way clutch 110A.
Are integrally rotated clockwise. The rotational driving force of the bank paper feeding motor 107 is transmitted as a driving force for rotating the shaft 32a of the separation roller 32 on the paper feeding means 29-2 side clockwise through the transmission by the lower gear train, Next, the separation roller 32 and the invocation roller 30 rotate clockwise in the same manner as described with reference to FIGS. By rotating the pair of intermediate gears 109a and 109b in the clockwise direction in parallel with this, the shaft 32a of the separation roller 32 on the paper feeder 29-1 side is transmitted through the transmission of the rotational driving force by the upper gear train.
Is transmitted as a driving force for rotating the shaft 3 in the counterclockwise direction.
2a is rotated only, and the rotation driving force is not transmitted to the pulley 32A.
7 is driven by the separation roller 32 and the recall roller 3
0 will not be transmitted.

With reference to FIGS. 2 to 19, a control configuration related to the sheet feed control in the first embodiment, other than the above-described control components such as the sensor and the motor, will be described. As shown in FIGS. 2 and 7, a rear end plate 20 b of the impression cylinder 20.
A light-shielding plate 68 for feeding the main body and a light-shielding plate 69 for the main body resist are attached to the outer wall of the main body by screws at predetermined intervals on the same circumference of the impression cylinder 20. In addition, the impression cylinder 20
On the outer side wall of the end plate 20b on the back side, a light-shielding plate 70 for bank paper feeding and a light-shielding plate 71 for bank resist are arranged on the same circumference inside the circumferences of the above-described light shielding plates 68 and 69. They are attached with screws at predetermined intervals.
Each of the light-shielding plates 68, 69, 70, and 71 is made of, for example, a sheet metal such as stainless steel or an appropriate synthetic resin, has an L-shape in a front view and a side view, and has a distal end formed to protrude to the back side. I have.

On the other hand, as shown in FIGS. 2, 7 and 11, inside the arm 25b, the same as the impression cylinder 20, to which the main body light-shielding plate 68 and the main body resist light-shielding plate 69 are attached. The paper feed start sensor 65 faces the circumference, and starts the bank paper feed facing the same circumference of the impression cylinder 20 on which the bank paper shielding plate 70 and the bank resist shielding plate 71 are attached. A sensor 66 is attached with a screw 63 via a sensor bracket 64. Paper feed start sensor 65
The bank paper feed start sensor 66 is a transmission type optical sensor having a light emitting unit and a light receiving unit.

The main body light-shielding plate 68 and the paper-feed start sensor 6
Reference numeral 5 denotes an auxiliary sheet feeding unit 28 which is attached so as to selectively engage and shield light only at a predetermined rotation position where the impression cylinder 20 has rotated counterclockwise. Has a function as a paper feed timing detecting means for determining a timing for feeding the leading end of the paper P by the paper feeding means 29. The predetermined rotational position of the impression cylinder 20 is, in other words, the mounting position of the main body light-shielding plate 68 to the end plate 20b of the impression cylinder 20 is, as shown in FIG.
As shown in the figure, the impression cylinder 20 is rotated counterclockwise by θ ′ = 19.
The paper feed start sensor 65 is set to be turned on at a position rotated by 4 °. At this time, as described above, the registration roller up / down mechanism operates to separate from each other,
The upper registration roller 33a is connected to the lower registration roller 3
3b, the gap is formed between the pair of registration rollers 33a, 33b so that the pressing force of the pair of registration rollers 33a, 33b due to the urging force of the spring is not applied to the sheet P.

The light-shielding plate 69 for the main body resist and the paper feed start sensor 65 are mounted so as to selectively engage and shield light only at a predetermined rotational position where the impression cylinder 20 has rotated counterclockwise. It has a function as timing detection means for setting the timing to start feeding the leading end of the sheet P by the pair of registration rollers 33a and 33b toward the sheet clamper 21 of the impression cylinder 20. The predetermined rotational position of the impression cylinder 20 is, in other words, the impression cylinder 20 of the main body resist light shielding plate 69.
The mounting position on the end plate 20b is, as an example,
The paper feed start sensor 65 is set to be turned on at a position where the impression cylinder 20 is rotated counterclockwise at θ ′ = 307 °.

The bank sheet supply light-shielding plate 70 and the bank sheet supply start sensor 66 are mounted so as to selectively engage and shield light only at a predetermined rotation position where the impression cylinder 20 has rotated counterclockwise. And a bank registration roller pair 106a,
The sheet feeding means 29- of the bank sheet feeding unit 200 for 106b
It has a function as a bank paper feed timing detecting means for determining the timing for feeding the leading edge of the paper P by the first or the paper feeding means 29-2. The predetermined rotational position of the impression cylinder 20 is, in other words, the mounting position of the bank sheet light blocking plate 70 to the end plate 20b of the impression cylinder 20, as shown in FIG. The body 20 moves in the counterclockwise direction θ ′ =
The bank feed start sensor 66 is set to be turned on at a position rotated by 0 ° (when the impression cylinder 20 occupies the home position).

The light-shielding plate for bank resist 71 and the bank feed start sensor 66 are mounted so as to selectively engage and shield light only at a predetermined rotation position where the impression cylinder 20 has rotated counterclockwise. , Registration roller pair 33 on the main body side
It has a function as a bank registration timing detecting means for setting a timing for feeding the leading end of the sheet P by the bank registration roller pair 106a, 106b of the bank paper feeding unit 200 toward the bank paper a, 33b. The predetermined rotational position of the impression cylinder 20 is in other words,
The mounting position of the impression cylinder 20 on the end plate 20b is, in a practical example, such that the impression cylinder 20 is rotated counterclockwise by θ ′ = 104 °.
The bank feed start sensor 66 is set to be turned on at the position where the rotation is made.

As shown in FIG. 2, FIG. 7 and FIG.
2, the encoder 60 is attached with a screw 63. The encoder 60 is an incremental-type photo encoder in the first embodiment, and is a one-channel photo encoder in which a number of slits are radially arranged on an outer peripheral portion. On the other hand, inside the arm 25b near the encoder 60, as shown in FIGS. It is attached at 63. The encoder 60 and the encoder sensor 61 are provided between the paper clamper 21 of the impression cylinder 20 and the registration roller pair 33.
It has a function of a pulse encoder for detecting the fluctuation of the rotation speed of the impression cylinder 20 for controlling the timing of feeding the leading end of the sheet P by a and 33b. Note that the outer diameter of the encoder 60 is the same as the outer diameter of the impression cylinder 20 as shown in FIGS. 7 and 8, and is small in FIG. The illustration of the encoder sensor 61 is omitted in FIG. 7 for the same purpose as described above, and is simply drawn with the sensor bracket 64 omitted in FIGS. 2 and 8.

Next, a detailed configuration of the operation panel 90 will be described with reference to FIG. The operation panel 90 is provided above the document reading unit 3. On the operation panel 90, a plate making start key 91 for setting and inputting activation of each operation from image reading of a document image to plate feeding, a ten key 93 for setting and inputting the number of prints, and the like,
A print start key 92 for starting a printing operation of the number of prints set and input by the user, and an LCD (liquid crystal display device) for displaying setting / detection information in each operation process from reading an image of an original image to printing as needed. ) The display unit 94 and the tray selection unit having a function of a sheet size setting unit for selecting and inputting the sheet sizes of the upper tray 143 and the lower tray 145 of the auxiliary tray 31 of the auxiliary paper feeding unit 28 or the bank paper feeding unit 200. A paper size input key 98 (hereinafter simply referred to as “paper size input key 98”) and any of the trays 31 and 1 selected and input by the paper size input key 98
Setting keys 95 having the function of paper size setting means for determining the paper sizes of 43 and 145 and other input information
And a left arrow key 99B for shifting to the left to select the job information displayed on the LCD display unit 94.
Right arrow key 99C for shifting rightward to select the job information displayed on the LCD display unit 94.
And four shift keys 99Ac, 99Aa, 99Ab, and 9 for shifting in one of left, right, up, and down directions to select the job information displayed on the LCD display unit 94.
A cross cursor key 99A having 9Ad and a printing speed setting means for selectively setting one printing speed from five printing speed levels 1 to 5 as printing speed setting values. A print speed setting key 96 comprising a speed down key 96a and a speed up key 96b;
A speed indicator 97 composed of a group of LED lamps for displaying a set printing speed set by the speed down key 96a or the speed up key 96b, and a paper type input as a paper type setting means for setting the type of the paper P Key 190
Paper type detecting means for automatically detecting the type of paper P selectively set with the paper type input key 190 (hereinafter, sometimes referred to as “paper type”) or the type of paper P described later Paper type detection sensors 195, 195-1,
A lamp group 191 composed of LEDs (light emitting diodes) for displaying a paper type for displaying the paper type detected by 195-2 (encircled by a virtual line in FIG. 19) is arranged.

By pressing the paper size input key 98 once, the display on the display screen displayed on the LCD display section 94 can be changed from "paper size" to "cancel". Cancel key 98A having a function of returning to the original display screen before pressing input key 98
Becomes At the top of FIG. 18, one screen of the LCD display unit 94 is shown, and the contents of a job to be performed by the operator are displayed in a rectangular column at the top of the LCD display unit 94. Here, "Plate making and printing is possible" is displayed, indicating that the steps and operations from plate making to printing are possible. Next, when the paper size input key 98 is pressed, the screen is switched to the second display screen from the top. In this state, the "automatic" with the hatched display is automatically selected, and the paper size corresponding to the original paper size is automatically selected and set. Do. For example, here, when the operator presses the cancel key 98A, the screen returns to the original initial screen before pressing the paper size input key 98.
When the right arrow key 99C or the right cursor key 99Aa of the cross cursor key 99A is depressed, the screen is switched to the third display screen from the top, and in the “top tray” (top tray 143) of the bank sheet feeding unit 200 indicated by hatching. “(* A4 □)” means paper P of paper size A4
Is displayed in a selected state. Then, when the setting key 95 is pressed, the display is switched to the fourth display screen from the top, and “* A4 □” is displayed in “on the tray” (on the tray 143), that is, the sheet P of the sheet size A4 is displayed.
Is displayed in the state where is set.

On the speed indicator 97, the "set printing speed: 3rd speed" with the hatched portion at the center where the printing speed is displayed is a standard printing speed corresponding to the printing speed normally used. The setting is automatically made when the down key 96a or the speed up key 96b is not pressed. Here, for example, the “set printing speed: 1” on the leftmost side where “slow” is displayed.
"Speed" means that the printing speed is the lowest speed of 60 sheets / min: 60 rpm.
In the case of "set print speed: 2nd speed", the print speed is 75 sheets / mi.
n: 75 rpm, “set print speed: 3rd speed” print speed is 90 sheets / min: 90 rpm, “set print speed: 4 speed”
“Speed” means that the printing speed is 105 sheets / min: 105 rpm,
“Setting printing speed: 5th speed” on the rightmost side where “Fast” is displayed is the highest printing speed of 120 sheets / min: 1
It is set corresponding to each of 20 rpm.

The speed indicator 97 is a speed down key 96a.
Or, by pressing the speed up key 96b every time,
The print speed that can be switched to the set print speed of five stages from 1 to 5 (hereinafter, sometimes simply referred to as “set print speed: 1st to 5th speed”) is displayed. The speed down key 96a or the speed up key 96b is arranged near the speed indicator 97, and each time the key is pressed once, the set print speed corresponds to any one of the first to fifth set print speeds. It also has a function of sequentially switching the lighting of the LED lamps, whereby the set printing speed selected by the operator can be visually confirmed on the speed indicator 97.

In this example, the lamp group 191 includes three lamps for displaying that any one of the three groups is selected, that is, a lamp 191a for displaying that plain paper is selected. , A lamp 191b indicating that thick paper is selected, and a lamp 191c indicating that thin paper is selected. Pressing the paper type input key 190 once turns on the lamp 191a, pressing the 190 twice turns on the lamp 191b, and pressing the 190 times three times turns on the lamp 191c. Each time the button is pressed, the lighting of the lamp is sequentially switched to indicate that the paper type set by the user or the operator or the paper type detected by each of the paper type detection sensors 195, 195-1, and 195-2 is selected. It has become.

In FIG. 19, reference numeral 88 denotes a main body paper feed control device for mainly performing paper feed control on the stencil printing apparatus 100 side, and reference numeral 148 denotes a bank paper feed control for performing paper feed control on the bank paper feed unit 200 side. 1 shows a paper control device, respectively. The main body paper feed control device 88 and the bank paper feed control device 148
CPU (Central Processing Unit), I / O not shown
(Input / output) port, ROM (read only memory),
Each of the microcomputers has a RAM (read / write storage device), a timer, and the like, and a microcomputer having a configuration in which they are connected by a signal bus. Main body paper feed controller 88 and bank paper feed controller 148
Means that an on / off signal, a data signal, or a command signal is transmitted and received by performing serial communication with each other.

The CPU of the main body paper feed control device 88 (hereinafter, sometimes simply referred to as “main body paper feed control device 88” for the sake of simplicity of description) is connected to the operation panel 90 through the input port. It is electrically connected to the various keys described above and receives various output signals. The main body paper feed control device 88 is connected to the operation panel 9 via the output port.
0 is electrically connected to each of the above-mentioned display units and the like, and transmits and controls various command signals.

The main body paper feed controller 88 is electrically connected to the paper leading edge sensor 51 via the input port, and rotates the paper feeding motor 74 forward or reverse from the paper leading edge sensor 51 to a predetermined deflection. To receive the output signal. The main body paper feed control device 88 is electrically connected to the registration sensor 52 via the input port, and is connected to the registration roller pair 33a, 33b by the registration sensor 52.
, The output signal for the slip compensation of the paper P at the time is received.

The main body paper feed controller 88 is electrically connected to the paper feed start sensor 65 through the input port, and drives the paper feed motor 74 and the registration motor 58 from the paper feed start sensor 65. Output signal (start signal) for receiving.

The main body paper feed control device 88 is electrically connected to the bank paper feed start sensor 66 through the input port, and receives the bank paper feed motor 107 and the bank registration motor 101 from the bank paper feed start sensor 66. , And outputs these signals to the bank paper feed controller 148.

The main body paper feed controller 88 is electrically connected to the upper intermediate sensor 53 and the lower intermediate sensor 54 via the input port, respectively, and controls the paper P fed from the bank paper feed unit 200. A data signal relating to tip detection is received from the upper intermediate sensor 53 and the lower intermediate sensor 54.

The main body paper feed control unit 88 is electrically connected to the encoder sensor 61 via the input port, and receives an output pulse signal from the encoder sensor 61 relating to the rotation speed fluctuation of the impression cylinder 20.

The main body paper feed control unit 88 is electrically connected to the auxiliary tray paper size detection sensor group 50 (not shown in the block diagram of FIG. 19 for simplification of the drawing) via the input port. And receives a data signal related to the detection of the size of the paper stacked on the auxiliary tray 31 from the auxiliary tray paper size detection sensor group 50.

The main body paper feed controller 88 is electrically connected to the paper feed motor 74 via the output port.
Based on the output signal (start signal) from the paper feed start sensor 65 due to the engagement of the main body paper feed shielding plate 68 and the paper feed start sensor 65, the leading end of the paper P is moved to the registration roller pair 33.
The sheet feed motor 74 has a function as a sheet feed drive control unit for controlling the sheet feed motor 74 to perform normal rotation drive so as to feed the sheets 33a and 33b.

The main body paper feed control device 88 is electrically connected to the registration motor 58 via the output port, and by driving the registration motor 58, the registration roller pair 33a, 33b sends out the paper P. During the feeding, in response to paper feeding from any of the auxiliary paper feeding unit 28, the upper bank paper feeding unit 201, and the lower bank paper feeding unit 202,
Function of control means for driving and controlling the sheet feeding motor 74 so as to change the sheet conveying speed of the intermediate conveying roller pair 55a, 55b in order to maintain the deflection PA formed immediately before the nip portion of the registration roller pair 33a, 33b. Having. More specifically, the main body paper feed control device 88 reversely rotates the paper feed motor 74 so that the above-mentioned paper transport speed in the paper feed from the upper bank paper feed unit 201 is higher than that from the lower bank paper feed unit 202. It has the function of driving control. Further, the main body sheet feeding control device 88 is provided with the sheet feeding unit 29 of the auxiliary sheet feeding unit 28.
Has the function of controlling the paper feed motor 74 to rotate forward so as to make the paper transport speed of the paper feeder 200 higher than that from the bank paper feed unit 200.

The main body paper feed control unit 88 drives the registration motor 58 so that the registration roller pair 33a, 3
While the sheet 3b is feeding the sheet P, the sheet feeding motor 74 has a function of controlling the reverse rotation of the sheet feeding motor 74 so as to change the sheet conveying speed of the pair of intermediate conveying rollers 55a and 55b according to the sheet size. More specifically, the main body paper feed control device 88 selects, based on the output signal related to the paper size on the tray selected and set by the paper size input key 98 and the setting key 95 of the operation panel 90, or automatically selects the paper size. Based on the output signal related to the paper size set on the tray (this is based on the bank size paper sensor 50-1 and the bank size paper sensor 50 transferred from the bank paper feed controller 148). This is equivalent to the sheet size detection signal detected at -2), and controls the paper feed motor 74 to rotate in the reverse direction so as to change the sheet conveyance speed of the pair of intermediate conveyance rollers 55a and 55b.

The main body paper feed control device 88 drives the registration motor 58 so that the registration roller pair 33a, 3
While the sheet 3b is sending out the sheet P, the sheet feeding motor 74 has a function of driving and controlling the sheet feeding motor 74 so as to change the sheet conveying speed by the pair of intermediate conveying rollers 55a and 55b according to the printing speed. More specifically, while the registration roller pair 33a, 33b is sending out the paper P by driving the registration motor 58, the main body paper feed control device 88 controls the printing speed setting key 96 (speed down key) of the operation panel 90. Key 9
6a or the speed-up key 96b), based on an output signal relating to the set print speed set automatically or automatically set to drive the paper feed motor 74 so as to change the paper transport speed by the intermediate transport roller pair 55a, 55b. It has a function to do.

Further, the main body paper feed control device 88 controls the paper holding position of the paper clamper 21 based on the ON output signal from the paper feed start sensor 65 due to the engagement between the main body resist light shielding plate 69 and the paper feed start sensor 65. After the start control of the registration motor 58 to feed the leading end of the sheet P in synchronization with the timing, the slippage of the sheet P between the registration roller pairs 33a and 33b is compensated based on a signal from the registration sensor 52 (hereinafter simply referred to as " In some cases, the registration motor 58 is controlled so as to increase the rotation speed of the pair of registration rollers 33a and 33b and increase the rotation amount based on the output pulse signal from the encoder sensor 61. Controls the registration motor 58 to feed the leading edge of the paper P in synchronization with the rotation position of the paper clamper 21 And, in accordance with the said respective control of the registration motor 58, a pair of registration rollers 33a, 33b
And an intermediate transport roller pair 55a, 55 as a paper transport unit
6 has a function as a control means for controlling the paper feed motor 74 to rotate in the reverse direction in order to maintain the deflection PA (shown in FIG. 6) between the sheet feeding motor 74 and the sheet feeding motor 74. At this time, the main body paper feed control device 88 controls the registration motor 58 by changing the number of drive pulses output to the registration motor 58 and the pulse width thereof, and simultaneously outputs the same to the paper feed motor 74. By changing the number of drive pulses and the pulse width thereof, the paper feed motor 74 is reversely driven. Further, after correcting the slip amount of the paper P, the main body paper feed control device 88 further feeds back the registration motor 58 by further changing the drive pulse width output to the registration motor 58 while responding to the output pulse signal from the encoder sensor 61. At the same time, the paper feed motor 74 is feedback-controlled by further changing the drive pulse width output to the paper feed motor 74.

The bank paper feed control device 148 is connected to the bank paper size detection sensor group 50- via the input port.
1 and the paper size detection group 50-1 above the bank which are electrically connected to the paper size detection sensor group 50-2 below the bank.
And a paper size detection signal detected by the paper size detection group under bank 50-2 is transferred to the main body paper supply control device 88.

The bank paper feed control device 148 is electrically connected to the bank registration sensor 135 and the bank feed sensor 136 through the input port, respectively, and is detected by the bank registration sensor 135 and the bank feed sensor 136. The data signal relating to the detection of the leading edge of the paper P is received.

The bank paper feed control device 148 is electrically connected to the upper bank upper limit sensor 137 and the upper bank lower limit sensor 138 via the input port, and controls the upper / lower bank moving motor 141. On / off signals related to the upper limit position and the lower limit position of the tray 143 are received. Similarly, the bank paper feeding control device 148 is electrically connected to the lower bank upper limit sensor 139 and the lower bank lower limit sensor 140 via the input port, respectively, and controls the lower bank vertical movement motor 142. An on / off signal related to the upper limit position and the lower limit position of the tray lower 145 is received.

The bank paper feed control device 148 is electrically connected to the bank paper feed motor 107 via the output port, and is supplied from the bank paper feed start sensor 66 transferred from the main body paper feed control device 88. Bank feed motor 10
An output signal (start signal) for rotationally driving the motor 7 is transmitted to the bank paper feed motor 107 and is controlled. Similarly, the bank paper feed control device 148 is electrically connected to the bank registration motor 101 via the output port, and the bank paper feed start sensor 66 transmitted from the main body paper feed control device 88. An output signal (start signal) for rotationally driving the bank registration motor 101 is transmitted to the bank registration motor 101 and is controlled.

The bank paper feed control device 148 is electrically connected to the bank up / down movement motor 141 via the output port, and is provided with an upper limit position and a lower limit from the bank upper limit sensor 137 and the bank upper / lower limit sensor 138. It has a function of controlling the bank up / down movement motor 141 to move up / down the tray 143 based on the on / off signal related to the position. Similarly, the bank paper feed control device 148 is electrically connected to the bank lower vertical movement motor 142 via the output port, and is connected to the upper limit position from the lower bank upper limit sensor 139 or the lower bank lower limit sensor 140. And a function of controlling the bank lower vertical movement motor 142 to move up and down the tray lower 145 based on the ON / OFF signal related to the lower limit position.

The bank paper feed control device 148 is electrically connected to the registration clutch 104 via the output port, and turns on / off the registration clutch 104 to appropriately connect and disconnect the rotational driving force of the bank registration motor 101. Control off. Similarly, the bank paper feed control device 148
Is electrically connected to the intermediate clutch 117 via the output port, and controls ON / OFF of the intermediate clutch 117 to appropriately connect and disconnect the rotational driving force of the bank paper feed motor 107. The bank paper feed control device 148 is electrically connected to the paper feed clutch 123 via the output port, and controls the paper feed clutch 123 to appropriately connect and disconnect the rotational driving force of the bank paper feed motor 107. On / off control.

The ROM in the main body paper feed control unit 88 contains the data shown in FIG. 20 and FIG.
2 and the control operation of the timing chart shown in FIG.
28, the contents of variable control of drive pulses output to the registration motor 58 and the paper feed motor 74 shown in FIG.
The operation program of the flowchart shown in FIG. 31 to FIG. 31 is stored in advance. In the ROM, a value obtained by converting a constant distance from the sheet leading edge sensor 51 to the nip portion of the pair of registration rollers 33a and 33b into the number of pulses of the sheet feeding motor 74 is stored in advance as data. A predetermined distance from the nip between the pair of registration rollers 33a and 33b to the nip between the impression cylinder 20 and the plate cylinder 1 is set by the registration motor 58.
Is previously stored as data.

The ROM is formed at a position immediately before the nip portion of the pair of registration rollers 33a and 33b in response to paper feeding from one of the upper bank paper feeding unit 201 and the lower bank paper feeding unit 202. In order to maintain the deflection PA, data relating to the rotational drive control of the paper feed motor 74 for changing the paper transport speed of the pair of intermediate transport rollers 55a and 55b is stored in advance. The ROM stores in advance data relating to the rotational drive control of the paper feed motor 74 for changing the paper transport speed of the pair of intermediate transport rollers 55a and 55b according to the paper size. The ROM stores in advance data relating to the rotational drive control of the paper feed motor 74 for changing the paper transport speed of the pair of intermediate transport rollers 55a and 55b according to the printing speed. Further, the ROM includes a pair of intermediate transport rollers 55a, 55a according to the type of paper.
Data relating to the rotational drive control of the paper feed motor 74 for changing the paper transport speed of 5b is stored in advance.

The ROM stores data relating to the rotational drive control of the registration motor 58 for changing the sheet conveyance speed of the registration roller pair 33a, 33b, and the intermediate conveyance roller pair 55a, 55b for maintaining the deflection PA. The data relating to the rotational drive control of the paper feed motor 74 for changing the paper transport speed is stored in advance. In addition,
The data and the like stored in the ROM in the main body paper feed controller 88 are appropriately stored in the ROM in the bank paper feed controller 148.
May be shared.

The RAM in the main body paper feed control device 88
The result of the calculation by the CPU is temporarily stored, and each sensor 5
1, 52, 65, 66, 53, 54, the encoder sensor 61, or the sensor groups 50-1, 50-2 and the sensors 135, 1 from the bank paper feed controller 148 side.
The output data signal such as 36 is stored as needed, and input / output of these signals is performed. The RAM in the bank paper feed controller 148 temporarily stores the output data signal transferred from the main body paper feed controller 88 and the calculation result in the CPU. The timer in the main body paper feed control unit 88 is provided with the respective delay times Da, Db, Dc, Dd, and Ds shown in FIGS.
It has the function of setting De, Df, timing and changing.
Note that, in the control block diagram shown in FIG. 19, the control target components of the respective drive units described above are omitted, and the main control components and the control target components related to the sheet feeding control of the first embodiment are illustrated. FIG.

For convenience of explanation, first, the auxiliary sheet feeding section 28
The operation on the side of the stencil printing apparatus 100 provided with is described. When a document is set on the document reading unit 3 and the plate making start key 91 is pressed, the plate cylinder 1 occupying the home position is rotated, and the used master is moved to the plate cylinder 1.
Is separated from the outer peripheral surface by the plate discharging device 18 and discarded.
Thereafter, the plate cylinder 1 is stopped at a position where the master clamper 12 occupies the plate feeding position which is located substantially on the right side in FIG.
Is opened, and a plate feeding standby state is set.

Next, by driving the pulse motor 6 of the plate making and writing section 19, the platen roller 9 starts to rotate, and the master 2 is conveyed while being fed out. on the other hand,
When a scanner (not shown) operates in the document reading unit 3, the image of the document is read, and the A / D
The heating element of the thermal head 17 is selectively heated by the digital image signal processed and transmitted by the conversion unit and the plate making control unit, and the master 2 starts to be selectively heated and pierced according to the image information.

The master 2 is conveyed by the rotation of the platen roller 9, and the leading end of the master 2 is sent out to the master clamper 12 which is expanding in a plate feeding standby state. When the number of steps of the pulse motor 6 reaches a certain set value, the master clamper shaft 12a is rotated to close the master clamper 12, and the leading end of the master 2 having been made is clamped by the master clamper 12.

Simultaneously with this clamping operation, the plate cylinder 1 and the impression cylinder 2
0 is rotated at substantially the same peripheral speed as the transport speed of the master 2, and the master 2 having been made is wound around the outer peripheral surface of the plate cylinder 1. When the master 2 having been made is wound on the outer peripheral surface of the plate cylinder 1 for a predetermined length, the rotation of the plate cylinder 1, the impression cylinder 20, and the platen roller 9 is stopped. Simultaneously with this stopping operation, the cutter drive motor 7 is rotated, and the eccentric cam 8 lowers the upper cutter member 4 to cut the master 2. Then, the plate cylinder 1 is rotated in the clockwise direction again, and the rear end (not shown) of the cut master 2 is pulled out from the plate making / writing unit 19, and the plate cylinder 1 is rotated.
The master 2, which has been made, is completely wound on the outer peripheral surface of the master 2.

Next, the procedure for transporting the sheet P will be described with reference to FIG.
0, the timing chart of FIG. 21, FIGS. 23 to 27
This will be described with reference to the flowcharts of FIGS. Note that the timing chart of FIG. 20 shows the sheet feeding operation timings of both the auxiliary sheet feeding unit 28 on the stencil printing apparatus 100 side and the bank sheet feeding unit 200 side. 1 occupies the home position, and the paper feeding operation timing by the auxiliary paper feeding unit 28 of the stencil printing apparatus 100 is set to the left with the rotation position θ ′ = 0 ° where the impression cylinder 20 occupies the home position set to the left. The sheet feeding operation timing of the unit 200 is shown on the right side. In the timing chart of FIG. 21, the auxiliary sheet feeding unit 28 on the stencil printing apparatus 100 side is used.
Of the paper feeding operation of each of the paper feeding units 28 and 20
FIG. 2 shows the sheet feeding operation timing after the rotation of the pair of registration rollers 33a and 33b, which is substantially common to FIG.
0 includes a part that partially overlaps the timing chart.

First, in step S1 of FIG. 28, it is determined whether or not the sheet can be started to be fed. That is, in FIG. 2, an appropriate ink reservoir 16 that enables printing by the ink supply device 22 in the plate cylinder 1 is formed, and by pressing the plate making start key 91, it is determined whether or not the printing is possible. You. Here, if the printing is possible, the process proceeds to step S2, and it is determined whether or not paper is fed from the bank paper feeding unit 200. This is achieved by pressing the paper size input key 98 and the setting key 95 of the operation panel 90 or automatically by the auxiliary tray 31 of the auxiliary paper feeding unit 28, the tray upper 143 of the bank upper paper feeding unit 201, or the bank lower paper feeding unit. This is performed by feeding the paper 202 from the lower tray 145 and selecting and setting the paper size. Here, when the sheet is fed from the auxiliary sheet feeding unit 28 which is not the sheet feeding from the bank sheet feeding unit 200, the process proceeds to step S3, and the sheet feeding routine from the auxiliary tray 31 is executed. Hereinafter, for convenience of explanation, the sheet feeding operation related to the execution of the sheet feeding routine from the auxiliary tray 31 will be described, and then step S
The paper feeding operation related to the execution of the paper feeding routine in the bank paper feeding unit 200 after the fourth will be described.

When the impression cylinder 20 rotates counterclockwise as shown in FIGS. 20 and 21 (a) and FIG.
When the light-shielding plate 68 for feeding the main body passes through the paper feed start sensor 65, the ON output signal is transmitted to the main-body feed control device 88.
And a certain delay time (hereinafter sometimes referred to as “delay”) from the time of inputting the ON output signal.
, The paper feed motor 74 is driven to rotate forward. As a result, the separation roller 32 is rotated clockwise, and at the same time, the paper P
Is fed and the separation roller 32 and the separation pad 34 prevent double feeding of the sheet P, and only the topmost sheet P is sent toward the registration roller pair 33a, 33b. Then, as shown in FIG. 21B, when the leading edge of the sheet P is detected by the sheet leading edge sensor 51 located at a position Xamm below the separation roller 32 on the downstream side of the horizontal sheet feeding path RX, the leading edge of the sheet P is detected. The sensor 51 is turned on, and the on output signal is input to the main body paper feed control device 88.

At this time, as shown in FIG. 5 and FIG. 24, the feed amount of the paper P is a predetermined amount of curved deflection due to the front end of the paper P colliding with the portion just before the nip portion of the pair of registration rollers 33a and 33b. A predetermined drive pulse is output to the paper feed motor 74 via the motor drive circuit by a command from the main body paper feed controller 88 so that the paper P is fed out by Xcmm so that PA is formed. (Deflection amount adjustment). As a result, the rotation of the paper feed motor 74 is stopped when the predetermined amount of the flexure PA is formed upward at the leading end of the paper P as shown in FIG. Stop.
This predetermined amount of deflection PA is caused by the registration roller pair 33a,
The skew and non-feed of the sheet P due to the rotation of the roller 33b do not occur, and the deflection amount is set in advance within a certain range in which the deflection amount is appropriate and the noise can be reduced. The predetermined amount of deflection PA is set so that the feed amount of the sheet P by the sheet feeding means 29 of the auxiliary sheet feeding unit 28 is made larger than that from the bank sheet feeding unit 200 in accordance with a command from the main sheet feeding control unit 88. This is performed by controlling the paper feed motor 74 to rotate forward. If the feeding amount of the paper P by the paper feeding unit 29 of the auxiliary paper feeding unit 28 is set to be larger than that from the bank paper feeding unit 200, if the paper feeding from the auxiliary tray 31 of the auxiliary paper feeding unit 28 is performed, As shown in FIG. 5, the formation portion of the flexure PA is wide in space, and since the upper portion of the curved portion of the guide plate 38 in the horizontal paper feed path RX is opened, it is possible to have a sufficient margin for flexure formation. This is because a variety of paper types are used as described above. On the other hand, if the paper is fed from the bank paper feeding unit 200, the space for forming the flexure PA is very narrow in space as shown in FIG. This is a state in which the formation portion of the flexure PA in the upper part of the path RZ is closed, and under such conditions, the leading end of the paper P is abutted against a portion immediately before the nip portion of the pair of registration rollers 33a, 33b to form a flexure. Because you have to do it.

The feed amount Xc of the sheet P is, for example, a distance 19 m on the horizontal sheet feeding path RX between the nip portion of the pair of registration rollers 33a and 33b and the sheet leading edge sensor 51.
25 mm feed amount (+6 mm to m)
When converted to the number of pulses of 4, this corresponds to 80 pulses after the paper leading edge sensor 51 is turned on. However, the feed amount per pulse is equivalent to 0.314 mm. ). The main body paper feed control unit 88 calculates to convert the number of steps corresponding to the feed amount so as to control the paper feed motor 74 according to the feed amount, and sends a command signal to the paper feed motor 74. The predetermined deflection P
The paper P is fed by the rotation of the separation roller 32 as long as A is formed. Due to such a specific amount of deflection adjustment by the main body sheet feeding control device 88, the leading end of the sheet P collides with a portion immediately before the nip portion of the pair of registration rollers 33a, 33b at a constant feed speed, and a predetermined amount of deflection PA Since the feed motor 74 is controlled so that the feed amount of the sheet P forming the image is constant, the amount of deflection can be stably adjusted regardless of the printing speed.

Here, as the constant delay Da, the rear end of the maximum sheet length 447 mm is
Is the rotational position of the impression cylinder 20 and θ '= about 200 °
It is desirable that the rotation angle of the impression cylinder 20 be set to about 10 ° or more in consideration of the margin at this time. As described above, the output start time of the ON output signal of the paper feed start sensor 65 due to the engagement with the main body paper feed shielding plate 68 and the paper feed motor 7
By providing a predetermined delay Da between the start of driving of the drive 4 and the start of driving, there is an advantage that it is easy to correct variations among machines and control is easily performed by software. Further, the delay Da is useful in creating an operation timing of the sheet feeding motor 74 using the turning on of the sheet feeding start sensor 65 at the rotational position θ ′ = 194 ° of the impression cylinder 20 as a trigger.

Next, FIG. 20, FIG. 21 (a) and FIG.
As shown in FIG. 5, when the impression cylinder 20 further rotates counterclockwise and occupies its rotational position θ ′ = 307 °, the main body resist light-shielding plate 69 passes through the paper feed start sensor 65, The ON output signal is sent to the main body paper feed controller 88.
After a certain delay Db has elapsed from the input of the ON output signal, the sheet feeding motor 74 is driven to rotate simultaneously with the registration motor 58. As a result, the registration roller 33b is rotated counterclockwise to start feeding the leading edge of the sheet P toward the sheet clamper 21 of the impression cylinder 20,
By simultaneously rotating the separation roller 32 at a low speed for a short time, the noise generated when the deflection of the sheet P suddenly disappears is reduced. The delay Db is useful in making the operation timing of the registration motor 58 triggered by turning on the paper feed start sensor 65 at the rotational position θ ′ = 307 ° of the impression cylinder 20.

By rotation of the pair of registration rollers 33a and 33b, as shown in FIG. 21 (c), the position of the leading end of the sheet P abutting on the position immediately before the nip portion of the pair of registration rollers 33a and 33b is shifted by Xbmm (implemented). For example, 19
mm, the registration sensor 52 is turned on, and an ON output signal thereof is input to the main body sheet feeding control device 88. At this time, since the distance from the abutting position of the sheet P at the nip of the pair of registration rollers 33a and 33b to the attachment position of the registration sensor 52 is constant, the drive pulse count of the registration motor 58 should be constant. Slip is likely to occur in the initial rotation of the roller pair 33a, 33b. Therefore, the drive pulse count until the registration sensor 52 is turned on may change for each sheet.
Therefore, the main body feeding control device 88 controls the registration sensor 52
The delay of the sheet P is determined from the drive pulse count until the switch is turned on, the peripheral speed of the registration motor 58 is increased, and the rotation amount is increased to correct the slip amount.

In other words, the main body paper feed controller 88 counts the number of drive pulses required to convey the sheet P and turn on the registration sensor 52 by rotating the registration motor 58, and On the other hand, assuming that the drive pulse for transporting the leading end of the sheet P by Xdmm is output through the motor drive circuit, the slip amount of the sheet P in the registration roller pair 33a, 33b = (Xd-Xb The slip amount is adjusted so as to increase the number of drive pulses to increase the rotation amount of the registration motor 58 and to reduce the drive pulse width in order to increase the rotation speed (pps) of the registration motor 58 in accordance with mm. Make corrections.

This will be described more exemplarily as follows. As described above, the distance on the horizontal paper feed path RX between the registration sensor 52 and the nip between the pair of registration rollers 33a and 33b is constant and predetermined. Therefore, the number of drive pulses of the registration motor 58 for rotating the registration roller 33b to convey the sheet P corresponding to this distance is also constant. For example, by changing the paper quality, the registration sensor 52 does not turn on even when the number of drive pulses reaches a predetermined number of times after the rotation of the registration roller 33b, and the paper P slips. Then, a command signal is sent to the registration motor 58 so that the registration sensor 52 sends a larger number of drive pulses that are actually turned on by the difference of the predetermined drive pulse number. At the same time, the drive pulse width is reduced to increase the rotation speed of the registration motor 58.

As shown in FIG. 22, the control of the slip amount correction is performed by the main body sheet feeding control unit 88 by the registration motor 5.
By varying 8 driving pulse number to be output to the (p ₁ ~p ₄₎ and the pulse width (t ₁ ~t ₄₎ together is carried out by controlling the registration motor 58.

After the completion of the above-described slip amount correction, the main body paper feed control device 88 takes in the output pulse signal from the encoder sensor 61 and responds to it while adjusting the timing to the paper holding position of the paper clamper 21 to adjust the timing of the paper P. A so-called feedback control for controlling the registration motor 58 to feed the leading end (in FIG.
).

As described above, when the registration motor 58
The paper feed amount for feeding the paper P with a pulse and the outer peripheral movement amount of the impression cylinder 20 corresponding to one pulse width of the encoder 60 are set to be the same. Thereby, for example, the main body sheet feeding control device 88 controls one of the encoders 60 fixed to the impression cylinder 20.
The time required for the pulse width is detected by the timer in the main body paper feed control unit 88. If the time required for one pulse of the encoder 60 becomes longer due to a load fluctuation on the impression cylinder 20 side, the registration motor 58 is decelerated. Conversely, the main body paper feed control device 88 performs a feedback control FBC in which the registration motor 58 is accelerated when the time required for one pulse of the encoder 60 is reduced.

In other words, the main body paper feed control unit 88 always tracks the peripheral speed of the impression cylinder 20 with the pulse fluctuation detected by the encoder sensor 61 as the rotation unevenness due to the load fluctuation of the impression cylinder 20 and the like. The feedback control FBC using the above-mentioned pulse encoder is performed to variably control the rotation speed of the registration motor 58 according to the fluctuation. At this time, the rotation position of the impression cylinder 20 is detected by the number of pulses detected by the encoder sensor 61, and the peripheral speed of the impression cylinder 20 is detected by the cycle time t detected by the encoder sensor 61. The main body feeding control device 88 is configured as shown in FIG.
As shown in, by changing the driving pulse width which is output to the register motor 58 (t ₁ ~t ₄₎ Further, the resist motor 58 is feedback controlled FBC, the registration deviation less and to improve the print registration accuracy ing. The impression cylinder 20 is rotated at a rotation speed (peripheral speed) according to a set print speed value set by a print speed setting key 96 provided on the operation panel 90 by driving the main motor 150. The paper P is transported at a feed speed (also a paper transport speed) of 1.4 times the peripheral speed of the impression cylinder 20, and when the paper clamper 21 of the impression cylinder 20 closes, catches up with the The speed becomes the same as the peripheral speed of the body 20.

The paper clamper 21 of the impression cylinder 20 is moved at a predetermined timing shown in FIG. 20 and FIG. 21 (a) (when the impression cylinder 20 occupies the rotational position θ ′ = 350.5 ° in the embodiment). open. Under the encoder feedback control FBC by the main body paper feed control device 88 as described above,
When the registration roller 33b is rotated in the counterclockwise direction and the upper registration roller 33a is driven to rotate clockwise through the sheet P, as shown in FIG. (Indicated by a broken line) disappears. At this time, by the action of each one-way clutch 67, the separation roller 32 and the call roller 30 are driven and rotated by the conveyance of the sheet P, and the leading end of the sheet P
Is transported toward the paper clamper 21 and the paper clamper 2
Hits 1 and collides.

In accordance with this timing, the paper clamper 21 of the impression cylinder 20 is moved to the position shown in FIG.
As shown in FIG. 7, after the front end of the paper P is gripped and clamped, the paper clamper 21 is closed (in a practical example,
When the impression cylinder 20 occupies the rotation position θ ′ = 10 ° (370 °)), the impression cylinder 20 rotates while holding the sheet P on the outer peripheral surface of the impression cylinder 20, and the leading end of the sheet P It is conveyed to the printing section between the outer peripheral surface of the cylinder 1 and the outer peripheral surface of the impression cylinder 20.

For the paper P conveyed to the printing section,
As shown in FIG. 27, the printing pressure spring 2
6a, 26b, the nip portion is formed by upwardly swinging displacement of the impression cylinder 20 pressing against the outer peripheral surface of the plate cylinder 1, and the outer peripheral surface of the impression cylinder 20 transfers the sheet P to the outer peripheral surface of the plate cylinder 1. 21 (in FIG. 21A, the impression pressure of the impression cylinder 20 is turned on).

In this way, the press of the outer peripheral surface of the impression cylinder 20 causes the paper P to be continuously pressed against the prepressed master 2 wound on the outer peripheral surface of the rotating plate cylinder 1, whereby the prepressed master 2 is pressed. 2 comes into close contact with the outer peripheral surface of the plate cylinder 1 and ink oozes from the perforated portion of the plate cylinder 1 to the perforated portion of the stencil master 2 and is transferred to the surface of the paper P, thereby performing stencil printing. .

At this time, the ink roller 13 also rotates in the same direction as the rotation direction of the plate cylinder 1. The ink in the ink reservoir 16 is attached to the surface of the ink roller 13 by the rotation of the ink roller 13, and the ink roller 13 and the doctor roller 1 are rotated.
The amount is regulated when passing through the gap with the plate 5, and is supplied to the inner peripheral surface of the plate cylinder 1.

Also during this time, the main body paper feed control device 88
The above-described pulse encoder feedback control FBC
Has been done. Then, the registration motor 58 is stored in the ROM by the main body feeding control device 88 by the amount stored in the ROM.
Is rotated (in the embodiment, until the impression cylinder 20 occupies the rotational position θ ′ = 75 ° (435 °)), the rotation of the registration motor 58 is stopped, and the main body paper feed control device is stopped. 88, the feedback control FBC ends.

The impression cylinder 20 is further rotated, and the sheet discharge position before the ejection claw 81 (in the embodiment, the position where the impression cylinder 20 occupies the rotation position θ ′ = 81.2 ° (441.2 °)). so,
When the paper clamper 21 is opened, the printed paper P is peeled off by the paper discharge claw 81, conveyed by the conveyance belt 85, and discharged and stacked on the paper discharge table 82. In this way, so-called printing is performed in which the master 2 having been made is filled with ink, and the printing drum 1 is separated from the impression cylinder 20 to return to the initial state, and a printing standby state is set.

After the printing is completed, the operator visually checks the discharged printed material to check the quality of the printed image, the position of the printed image, and the like.
By setting the number of prints and pressing the print start key 92, the steps of paper feed, printing, and paper discharge are repeated for the set number of prints, and all the steps of stencil printing are completed. The printing speed at this time is automatically set to the standard printing speed “set printing speed: 3rd speed” corresponding to the printing speed normally used since the printing speed setting key 96 was not pressed. Thus, the plate cylinder 1 and the impression cylinder 20 are rotated by the main motor 150 so as to have a printing speed corresponding to the set printing speed: third speed. After the leading end of the sheet P is fed from the nip portion of the pair of registration rollers 33a and 33b, the steps of sheet feeding and printing are performed at the sheet conveying speed and the printing speed corresponding to the "set printing speed: 3rd speed". A specific transport operation and printing operation of the paper P thus performed are performed.

Here, the output start time of the ON output signal generated by the engagement of the main body resist light-shielding plate 69 and the paper feed start sensor 65 as described above, and the drive start time when the registration motor 58 starts driving The constant delay Db provided between the two can be used to facilitate the correction of the variation between the machines or to facilitate the control by software.

Next, the paper feeding operation related to the execution of the bank paper feeding routine after step S4 in FIG. 28 will be described. In the execution of the in-bank paper feeding routine, the paper feeding operation is performed inside the bank paper feeding unit 200 while the transport speed of the paper P is constant. Hereinafter, the paper feeding operation in the bank paper feeding unit 200 will be described with reference to FIGS. Bank paper feed unit 20
The paper feeding operation within 0 is shown after step S30 in FIG. First, by pressing the paper size input key 98 and the setting key 95 of the operation panel 90 or automatically,
Paper is fed from the upper tray 143 of the upper bank paper feed unit 201 or the lower tray 145 of the lower bank paper feed unit 202, and the paper size is selected and set. Here, it is determined whether or not the paper is fed from the upper bank paper feeding unit 201, and the lower tray 145 and the lower bank paper feeding unit 202 of the lower bank paper feeding unit 202 are pressed by pressing the paper size input key 98 and the setting key 95 or automatically. When the paper size of the paper P stacked on the lower tray 145 is selected and set, the lower tray 145 is raised by the operation of the lower bank vertical movement motor 142, and the lower bank upper limit sensor 139 detects the lowermost tray 145. It is detected that the upper-level paper P has reached the paper feed position, whereby the paper can be fed (see step S31). As described above, by pressing the paper size input key 98 and the setting key 95 or automatically,
When the paper size of the second tray lower 145 and the paper P loaded on the lower tray 145 is selected and set, the paper P loaded on the lower tray 145 is previously set.
Is detected by the paper size detection sensor group 50-2, and the description of the same operation stage will be omitted below.

Then, in step S32, the impression cylinder 2
It is determined whether or not 0 is at the start of rotation and occupies its home position.
As shown in (a), when the rotation position occupies θ ′ = 0 °, the bank sheet supply light-shielding plate 70 passes through the bank sheet supply start sensor 66, and the ON output signal causes the main body sheet supply control. This is input to the device 88, and the main body paper feed control device 88 notifies the bank paper feed control device 148 that the bank paper feed start sensor 66 (rotational position θ ′ = 0 ° of the impression cylinder 20) has been turned on by serial transmission. (See step S33). Next, in step S34, the bank feed sensor 1
It is determined whether 36 is on. Here, it is determined whether or not the trailing edge of the sheet P fed before the second sheet after the start of sheet feeding has passed through the bank feed sensor 136, so that the leading edge of the sheet P currently being transported is determined. This prevents the rear end of the previously fed sheet P from catching up and causing a jam. If the bank feed sensor 136 is ON, it is determined that the rear end of the previously fed sheet P has not passed through the bank feed sensor 136, and the rear end of the previously fed sheet P is The sheet P that has been fed before is conveyed until the bank feed sensor 136 is turned off after passing through the feed sensor 136. When the bank feed sensor 136 is off and not on, the rear end of the previously fed sheet P is
6 is determined to have passed, the paper feed clutch 12
3 is turned on, the rotational driving force of the bank paper feeding motor 107 is made transmittable to the paper feeding means 29-2, and by turning on the intermediate clutch 117, the bank paper feeding motor 10 is turned on.
7 is made transmittable to the pair of intermediate rollers 118a and 118b (see steps S35 and S36). Next, by driving the bank paper feed motor 107 in the reverse direction, the intermediate roller pair 118a, 118b in FIG.
Is rotated, and the trailing end of the previously fed paper P is
Pair of bank registration rollers 106a, 10
6b. At the same time, the paper feeding means 29
-2 pickup is started. That is, FIG.
6, the separation roller 32 and the call roller 30 of the sheet feeding means 29-2 are rotated clockwise in FIG.
By rotating in the counterclockwise direction in FIG. 5, only one of the uppermost sheets P stacked on the lower tray 145 is sent out in the horizontal sheet feeding direction X1 (see step S37). In step S32, as shown in FIG. 20, after a predetermined delay Dc has elapsed from the input of the ON output signal of the bank paper feed start sensor 66 (rotational position θ ′ = 0 ° of the impression cylinder 20), the bank The paper feed motor 107 is driven to rotate in the reverse direction.

Then, the process proceeds to a step S38, wherein it is determined whether or not the bank feed sensor 136 is turned on. Here, it is determined whether or not the leading edge of the paper P being transported has reached the bank feed sensor 136. When the bank feed sensor 136 is turned on, it is determined that the leading edge of the sheet P being fed has passed the bank feed sensor 136. Therefore, the bank paper feed motor 107 is driven in reverse by a specified number of steps. ,
After the separation roller 32 and the call roller 30 of the paper feeding means 29-2 and the pair of intermediate rollers 118a and 118b are rotated by an amount corresponding to the paper transport distance corresponding to the reverse rotation of the designated number of steps of the bank paper feeding motor 107, the bank is rotated. Paper feed motor 1
07 is stopped, and then the paper feed clutch 117 is turned off. Due to the turning off of the paper feed clutch 117, the rotation driving force is not transmitted from the bank paper feed motor 107 to the separation roller 32 and the recall roller 30 in the subsequent paper feed operation. When the rear end portion is under the pressure contact of the separation roller 32 and the call roller 30, the separation roller 32 and the call roller 30 follow the conveyance of the sheet P. (Step S
38-S40).

Next, in step S41, it is determined whether or not the rear end of the previously fed sheet P has passed through the bank registration sensor 135. For the same reason as described in step S34, that is, the leading edge of the sheet P currently being transported may catch up with the trailing edge of the previously fed sheet P and cause a jam. A confirmation operation is performed. When the bank registration sensor 135 is not turned on and is off, it is determined that the rear end of the previously fed sheet P has passed through the bank registration sensor 135, so that the registration clutch 104 is turned on, and The paper motor 107 is driven to rotate in the reverse direction (steps S42 and S4).
3). Next, the process proceeds to step S44, where it is determined whether the bank registration sensor 135 is on.
Here, it is determined whether or not the leading edge of the paper P being transported has reached the bank registration sensor 135. When the bank registration sensor 135 is on,
Since it is determined that the leading edge of the paper P being fed has passed the bank registration sensor 135, the bank roller motor 107 is driven in reverse by a specified number of steps to rotate the pair of intermediate rollers 118a and 118b by a predetermined amount. As a result, the leading end of the sheet P is moved to the pair of bank registration rollers 106a,
After abutting against the portion of the bank registration roller pair 106a, 106b at the front end of the sheet P, the bank P feeds the bank paper feed motor 10b.
7 is stopped (see steps S44 to S46). Next, by driving the bank registration motor 101 forward by several steps, the leading end of the sheet P is held at the nip portion of the pair of bank registration rollers 106a and 106b, and the leading end of the sheet P is held and waited in that state. The intermediate clutch 117 is turned off (steps S47 and S48).
reference).

Next, when the impression cylinder 20 rotates counterclockwise and the rotation position of the impression cylinder 20 occupies θ ′ = 104 °, the bank resist light shielding plate 71 passes through the bank paper feed start sensor 66. Then, the ON output signal is input to the main body paper feed control device 88, and the main body paper feed control device 88
, The bank feed start sensor 66 is turned on by serial transmission to the bank feed control device 148 (θ ′ at the rotational position of the impression cylinder 20).
= 104 °) (step S49,
See S50). Thereafter, a delay Dd is set so as not to catch up with the rear end of the previously fed sheet P (see step S51). Next, by driving the bank registration motor 101 to rotate by the designated number of steps, the leading end of the sheet P is moved to the intermediate conveying roller pair 55a, 55.
b and the pair of registration rollers 33a and 33b. Then, after the rotational drive of the bank registration motor 101 is stopped, the registration clutch 104 is turned off, and the process proceeds to the bank sheet supply state management routine (step S52).
To S55). The delay Dd is provided between the time when the bank paper feed start sensor 66 is turned on and the time when the bank registration motor 101 is rotationally driven, and the bank feed start sensor 66 at θ ′ = 104 ° at the rotational position of the impression cylinder 20. The operation timing of the bank registration motor 101 is generated using ON as a trigger.

On the other hand, in step S30, the upper tray 143 of the upper bank paper feeder 201 and the upper tray 143
When the paper size of the paper P loaded on the bank is selected and set in the same manner as described above, the motor
By the operation of 41, the upper tray 143 is raised, and the upper limit sensor 137 on the bank detects that the uppermost sheet P on the upper tray 143 has reached the paper feed position, and thereby the paper can be fed (step). See S56).

Then, when the impression cylinder 20 is rotated at its rotational position, θ ′ =
When it occupies 0 °, the ON output signal is input to the main body paper feed control device 88 by passing the bank paper feed light-shielding plate 70 through the bank paper feed start sensor 66 in the same manner as the operation in step S33 described above. Then, the main body paper feed controller 88 notifies the bank paper feed controller 148 that the bank paper feed start sensor 66 (rotational position θ ′ = 0 ° of the impression cylinder 20) has been turned on by serial transmission (step S57, See S58). Next, in step S59, it is determined whether or not the rear end of the previously fed sheet P has passed through the bank registration sensor 135. Here, for the same reason as described in step S41, it is determined whether or not the rear end of the previously fed sheet P has passed through the bank registration sensor 135. When the bank registration sensor 135 is not turned on and is off, it is determined that the rear end of the previously fed sheet P has passed through the bank registration sensor 135, so that there is no problem even if the sheet P is fed. Therefore, the bank paper feed motor 107 is driven to rotate forward to start the pickup by the paper feed means 29-1 in FIG. That is, the separation roller 32 and the call roller 30 of the paper feeding unit 29-1 are rotated clockwise in FIG. 16 through the operation of the bank vertical paper feeding unit switching drive mechanism 125B in FIG. Is sent out in the horizontal sheet feeding direction X1 (see step S60).

Next, the process proceeds to a step S61, where it is determined whether or not the bank registration sensor 135 is turned on. Here, it is determined whether or not the leading edge of the paper P being transported has reached the bank registration sensor 135. When the bank registration sensor 135 is on, it is determined that the leading edge of the paper P being fed has reached the bank registration sensor 135, and the bank paper feed motor 107 is driven forward by the specified number of steps. As a result, the separation roller 32 and the recall roller 30 are rotated by a predetermined amount, whereby the leading end of the sheet P abuts against a portion immediately before the nip portion of the pair of bank registration rollers 106a and 106b, and the paper in the pair of bank registration rollers 106a and 106b After forming an appropriate deflection at the tip of P, the forward rotation drive of the bank paper feed motor 107 is stopped (step S6).
2, S63). Next, the bank registration motor 10
1 is driven forward by several steps to cause the leading end of the paper P to be held at the nip of the pair of bank registration rollers 106a and 106b, and to hold the leading end of the paper P in that state.
It is made to wait (refer to step S64). Next, the process proceeds to step S49, and the same operation as described above is performed.

Next, the sheet feeding operation after step S5 in the flowchart of FIG. 28 will be described with reference to FIGS. 23 to 27. 23 to 27, the conveyance state of the sheet P from the bank sheet feeding unit 200 is indicated by a virtual line. The operations from step S5 to step S7 are the same as the operations from step S49 to step S51 in FIG. 31, and a description thereof will be omitted. In step S8, the bank registration motor 101 is rotated to drive the bank registration roller pair 106.
a and 106b are rotated, and the leading end of the sheet P is conveyed to the vicinity of the lower intermediate sensor 54 in FIG.
Is turned on and the leading edge of the sheet P is detected,
4 is driven in the reverse direction, so that the pair of intermediate conveyance rollers 55
a and 55b rotate (see steps S9 and S10).

Here, as shown in FIG. 20, a predetermined delay Df is provided between the time point at which the bank registration motor 101 is driven to rotate and the time point at which the sheet feeding motor 74 is driven to rotate in the reverse direction. The delay Df is provided to shorten and suppress the rotation driving time of the sheet feeding motor 74 as much as possible. That is, in the first embodiment, as is clear from the timing chart of FIG.
It is easily presumed that the time during which the roller 4 is driven to rotate is relatively long, and a delay Df is provided in order to prevent the stepping-out of the sheet feeding motor 74 from occurring due to the overheating of the motor drive circuit and the like. ing. If the time during which the sheet feeding motor 74 is driven to rotate is short, the delay Df may not be provided.

Next, the intermediate conveying roller pair 55a, 55b
, The leading edge of the sheet P is conveyed to the downstream side of the vertical paper path RZ, the leading edge of the sheet P is detected by the intermediate sensor 53, and the leading edge of the sheet P is further downstream of the vertical sheet path RZ. Transported to Then, in step S11, the leading edge of the conveyed sheet P is detected by the sheet leading edge sensor 51. When the leading edge of the paper P reaches the paper leading edge sensor 51, the paper leading edge sensor 51 is turned on, and the ON output signal is input to the main body paper feed control device 88.

At this time, the pair of intermediate transport rollers 55a, 55
b, the feed amount of the sheet P is, as shown in FIG.
The auxiliary paper feed unit 28, in response to a command from the main body paper feed control unit 88, causes the tip of the auxiliary paper feed unit 28 to collide with a portion of the registration roller pair 33a, 33b immediately before the nip portion to form a predetermined amount of curved deflection PA. Depending on the paper feeding unit from the upper bank feeding unit 201 or the lower bank 202, a predetermined driving pulse for producing an appropriate bending is transmitted through the motor driving circuit according to the paper size. Paper feed motor 74
, The paper P is fed out by a predetermined feed amount (see step S12).

The predetermined amount of deflection PA is set within a predetermined range where the skew and non-feed of the sheet P due to the rotation of the pair of registration rollers 33a and 33b are prevented, and the deflection is appropriate and the noise can be reduced. It is set in experiments. The predetermined amount of deflection PA is supplied to the main body sheet feeding control device 88.
Is controlled by the reverse rotation drive control of the paper feed motor 74 so that the feed amount of the paper P in the paper feed from the upper bank paper feed unit 201 is made larger than that from the lower bank paper feed unit 202. You. Such a main body feeding control device 8
8, the leading edge of the paper P collides with a portion immediately before the nip portion of the pair of registration rollers 33a and 33b at a constant feed speed, and a predetermined amount of deflection PA
Since the feed motor 74 is controlled so that the feed amount of the sheet P forming the image is constant, the amount of deflection can be stably adjusted regardless of the printing speed.

Then, as shown in FIGS. 20 and 21 (a), when the impression cylinder 20 further rotates counterclockwise and occupies its rotational position θ ′ = 307 °, the main body resist light shielding plate 69 Is passed through the paper feed start sensor 65, the ON output signal is input to the main body paper feed control device 88, and after a certain delay Db from the input of the ON output signal, the registration motor 58 is driven to rotate. You. Accordingly, the registration roller 33b is rotated in the counterclockwise direction, and the feeding of the leading end of the sheet P toward the sheet clamper 21 of the impression cylinder 20 is started (see step S15).

At this time, if the sheet size is equal to or larger than the sheet size A4, the transport load applied to the pair of registration rollers 33a and 33b is reduced and the sheet P is
In order to prevent slipping at the nip portion of the a and 33b, a unique operation of assisting rotation (assist rotation) of the pair of intermediate transport rollers 55a and 55b by driving the paper feed motor 74 reversely for a short time is performed. Done. That is, the main body paper feed control unit 88 drives the registration motor 58 to cause the registration roller pair 33a, 33b to send out the paper P while the registration roller pair 33a, 33b sends out the paper P. In order to appropriately maintain the deflection PA formed immediately before the nip portion of the pair of registration rollers 33a and 33b in accordance with the paper feed from any one of the above and the paper size and the printing speed, 55
a, 55b so as to change the paper conveying speed.
4 is driven and controlled. At this time, the pair of intermediate transport rollers 55a,
The paper transport speed of 55b is determined by the pair of registration rollers 33a, 33a.
While the sheet 3b is feeding the sheet toward the sheet clamper 21, the deflection PA formed on the rear side of the pair of registration rollers 33a and 33b (upstream of the pair of registration rollers 33a and 33b in the vertical feeding direction Z). As a practical example, the ROM is stored in advance in the ROM as a control table relating to the sheet transport speed as shown in Table 1 so that the sheet does not disappear and the amount of flexure does not become excessive and the sheet breaks.

[0169]

[Table 1]

For example, as shown in Table 1, when the paper size A4 is supplied from the bank paper supply unit 200, the paper size A4 is supplied from the upper tray 143 of the bank paper supply unit 201.
While the pair of registration rollers 33a and 33b shown in FIG. 32 (a) for conveying the sheet P (shown by a thick solid line) is sending out the sheet P, the lower bank feeding as shown in FIG. Compared with the conveyance of the paper P of the same paper size (shown by a thick solid line) from the lower tray 145 of the paper unit 202, the pair of registration rollers 33a and 33b
Roller pair 33 during feeding of paper P
The transport load on a and 33b is increased, and slip is likely to occur. Therefore, in order to compensate for these transport loads, the intermediate transport roller pair 55a, 55b is assisted to rotate, and as shown in FIG. Paper section 20
2 and paper size B4
According to each paper size and printing speed of less than B4 or more,
Paper transport speed of the intermediate transport roller pair 55a, 55b with respect to the registration roller pair 33a, 33b (unit: mm / s)
(Seconds)) is controlled to control the paper feed motor 74. The change of the sheet conveying speed of the pair of intermediate conveying rollers 55a and 55b by the sheet feeding motor 74 is performed by changing the number of driving pulses applied to the sheet feeding motor 74.

In Table 1, for example, under the condition that the paper size is A4 and the printing speed is 90 rpm, which is the standard printing speed, 14
Comparing the paper transport speeds of the pair of intermediate transport rollers 55a and 55b in the case of paper feeding from the lower tray 145 of the lower bank paper feeder 202, the paper feed speed from the upper tray 143 of the upper bank paper feeder 201 is compared. In the case of paper feeding, the paper transport speed of the intermediate transport roller pair 55a, 55b is 1102.71 mm /
s, which is lower than the lower tray 1 of the paper feeder 202 under the bank.
It is set to be larger than 1085.74 mm / s in the case of paper feeding from No. 45.

In the case of feeding a paper size A3 whose length in the vertical paper feeding direction Z is longer than the paper size A4, the paper P of the paper size A3 (shown by a thick solid line) is conveyed from the tray 143. 33 (a), which is shown in FIG.
As compared with the conveyance of the sheet P of the same sheet size (shown by a thick solid line) from the lower tray 145 as shown in FIG. 3B, the conveyance load is further increased for the reason described in the above-mentioned conventional technique. The registration roller pair 33a, 33b
Roller pair 33a, 33 during feeding
The transport load on b is increased, and slip is likely to occur. Therefore, the intermediate transport roller pair 55a, 55b is assisted to compensate for this transport load, and the paper transport speed (unit: mm / s (second)) of the intermediate transport roller pair 55a, 55b is increased as shown in Table 1. The feed motor 74 is controlled so as to be variable.

For example, under the condition that the paper size is A3 and the printing speed is the highest speed of 120 rpm, the upper tray 143 of the upper bank paper feeding unit 201 and the lower bank paper feeding unit 2
A comparison of the sheet conveyance speed of the intermediate conveyance roller pair 55a and 55b in the case of sheet feeding from the lower tray 145 of No. 02 indicates that in the case of sheet feeding from the upper tray 143 of the bank upper sheet feeding unit 201, the intermediate conveyance is performed. The sheet conveying speed of the roller pair 55a, 55b is 1490.23 mm / s, which is set to be higher than 1447.65 mm / s in the case of feeding from the lower tray 145 of the lower bank feeding unit 202. . When the paper size is B5 or less,
It is known from experiments and the like that there is no problem even if the intermediate conveyance roller pair 55a, 55b is not rotated by the assist.

As described above, the registration roller pair 33
While a and 33b are sending out the paper P, according to paper feeding from any of the upper bank paper feeding unit 201 and the lower bank paper feeding unit 202, and according to the paper size and printing speed, In order to appropriately maintain the deflection PA formed immediately before the nip portion between the pair of registration rollers 33a and 33b, the main body feeding unit controls the sheet feeding motor 74 so as to change the sheet conveyance speed of the pair of intermediate conveyance rollers 55a and 55b. Control device 88
, The registration roller pair 33
The position of the image is shifted, the type of paper that can be transported is limited, or the speed of paper transport is high, due to variations in the amount of paper transported due to the fact that the leading edge of the paper P is transported to the printing unit with only the transport force a and 33b. As a result, the paper transport speed by the pair of registration rollers 33a and 33b is not reduced. Further, since the sheet feeding motor 74 is formed of a stepping motor, the responsiveness at the time of its rotational driving is improved. In addition, the control operation causes noise generated when the deflection PA of the sheet P during the operation described later suddenly disappears, and a conveyance load applied to the pair of registration rollers 33a and 33b due to the sudden disappearance of the deflection PA of the sheet P. Has been reduced.

This state is indicated by a broken line in FIG. 20, and a predetermined delay De is set from the start of the pair of registration rollers 33a and 33b when the registration motor 58 starts rotating.
After the time elapses, the sheet feeding motor 74 is driven by the assist rotation to start the pair of intermediate transport rollers 55a and 55b. In other words, the delay De is set from the time when the registration motor 58 is driven to rotate to the time when the sheet feeding motor 74 starts to rotate the pair of intermediate conveyance rollers 55a and 55b by the reverse rotation of the sheet feeding motor 74. 74, in other words, the intermediate transport roller pair 5
In order to generate the operation timings 5a and 55b, the timing is set for each sheet transport speed (or peripheral speed or linear speed) (see step S17). The reason for setting this delay De is
From a different point of view, it is as follows. That is, the sheet P is conveyed while the sheet P is securely held at the nip between the pair of intermediate conveyance rollers 55a and 55b, whereas the leading end of the sheet P is pinched at the nip between the pair of registration rollers 33a and 33b. In this state, the leading end of the sheet P is sent out while being held at the nip portion while the leading end of the sheet P is being bent at a position immediately before the nip portion of the pair of registration rollers 33a, 33b, instead of in a state where the sheet is bent. Furthermore, if the two pairs of rollers are rotated in such a state, the deflection becomes excessive.

As shown in Table 2, the value of the delay De is
The registration roller pair 33a, 33b and the intermediate conveyance roller pair 55a, 55a, according to paper feeding from any of the bank upper paper feeding unit 201 and the bank lower paper feeding unit 202, and according to the paper size and printing speed. Compensate for the difference in the feed amount of the sheet P at the start of the rotation drive with respect to the registration roller pair 55b.
a, 33b deflection P formed at the portion immediately before the nip portion
A is provided to maintain A moderately. That is, as described in the related art, the paper conveyance load depends on which of the paper supply unit 201 and the paper supply unit 202 below the bank, the paper size, and the set value of the printing speed. Since the values are different as described above, the value of the delay De is varied in accordance with these parameters. In Table 2, the value of the delay De changes the drive start time (also the rotation start time of the intermediate conveyance roller pair 55a, 55b) by changing the number of drive pulses applied to the paper feed motor 74. .

[0177]

[Table 2]

In Table 2, for example, when the printing speed is low, such as the printing speed or the first or second speed, the value of the delay De is increased (two pulses), and when the printing speed is high (4, 5). (Speed), the value of the delay De is reduced (no delay De), and when the paper size is small (B4 or less), the value of the delay De is increased (two pulses) because the transport load of the paper P is small. Each is set. When the printing speed (1st to 5th speed) is used as a parameter and the horizontal axis represents time (ms) and the vertical axis represents the rotation speed (pps) of the sheet feeding motor 74 (stepping motor), the above-mentioned values at each printing speed are obtained. The through-up curve of the stepping motor draws a curve whose inclination increases from the fifth speed to the first speed as the printing speed decreases. Therefore, the reason why the value of the delay De is changed in accordance with the printing speed as described above is that such a paper feed motor 74 is used.
Because the through-up curve becomes larger as the printing speed is slower, the advance amount of the paper P per unit time (ms) is different.

Although part of the description has been made before and after, as described above, the main body paper feed control unit 88 controls the paper feed motor 74 to change the delay De in accordance with paper feed from any of the bank paper feed units 200. Has a control function as a sheet transport drive start varying means for varying the drive start time (which is also the rotation start time of the intermediate transport roller pair 55a, 55b). Further, the main body paper feed control device 88 has a control function as a paper transport drive start variable unit that changes the drive start time of the paper feed motor 74 to change the delay De according to the type of paper. Further, the main body paper feed control device 88 has a control function as a paper transport drive start variable unit that changes the drive start time of the paper feed motor 74 so as to change the delay De according to the printing speed.

In the first embodiment, since the above-described means for varying the paper transport drive start is provided, the feed amount of the paper P by the pair of intermediate transport rollers 55a and 55b increases due to the difference in the paper transport load, and the registration roller pair 33a, 3
Paper bending occurs at the flexure PA portion generated between the pair 3b and the pair of intermediate transport rollers 55a and 55b, so that the printed paper discharged from the printing portion is not broken.

As described above, in step S18, the assist rotation operation by the intermediate conveyance roller pair 55a, 55b is started, and this assist rotation operation is
8 is a pair of intermediate transport rollers 55 according to paper feeding from any of the paper feeding units, and according to the paper size and printing speed.
a, 55b so as to change the paper conveying speed.
4 is controlled.

Due to the rotation of the pair of registration rollers 33a and 33b, as shown in FIG. 21C, the position of the front end of the sheet P abutting on the portion immediately before the nip portion of the pair of registration rollers 33a and 33b is shifted by Xbmm (implemented). For example, 19
mm), the registration sensor 52 is turned on, and the auxiliary sheet feeding unit 28 is turned on.
Slip amount correction similar to the paper feed operation from step S19 is performed (see step S19).

From step S19 to step S22 shown in FIG. 29, including the above-described slip amount correction, the main body paper feed control unit 88 takes in the output pulse signal from the encoder sensor 61 and responds to the signal. Feedback control (indicated by reference numeral FBC in FIG. 21A) for controlling the registration motor 58 so as to feed the leading end of the sheet P in synchronization with the sheet holding position of No. 21 is performed. The control operation at this time is performed by
8 and different. That is, the main body paper feed control device 8
Reference numeral 8 denotes an intermediate conveyance roller pair 55 in addition to the above-described slip amount correction and feedback control FBC for controlling the registration motor 58, while simultaneously taking in and responding to the output pulse signal from the encoder sensor 61.
Feedback control for controlling the sheet feeding motor 74 is performed so that the deflection PA of the sheet P does not increase due to the rotation of the rotations a and 55b, and the deflection amount does not disappear.

Under the above-described slip amount correction and encoder feedback control by the main body sheet feeding control device 88, the sheet conveyance speed between the pair of registration rollers 33a and 33b and the sheet conveyance speed of the pair of intermediate conveyance rollers 55a and 55b are controlled. FIG. 34 to FIG.
This will be described with reference to FIG. In FIGS. 34 and 36,
The upper diagram (A) of each drawing shows a speed diagram representing the sheet conveyance speed v1 of the registration roller 33b, and the lower diagram (B) of each drawing.
5 shows speed diagrams representing the sheet conveyance speed v2 of the intermediate conveyance roller 55a. In each figure (A),
The vertical axis represents the sheet conveyance speed v1 (mm / s) of the registration roller 33b converted in correspondence with the rotation speed f (pps) of the registration motor 58, and the horizontal axis represents the feed amount x (m) of the sheet P.
m) are taken respectively. Each figure (B)
On the vertical axis, the rotation speed f (pp
s), the paper transport speed v2 (mm / s) of the intermediate transport roller 55, which is converted in correspondence with s), is represented by the paper feed amount x (m) on the horizontal axis.
m) are taken respectively. And each figure (A),
In (B), the value of a on the vertical axis is the peripheral speed of the impression cylinder 20 (m
m / s), and the value of b on the horizontal axis indicates the paper feed corresponding to the basic step number of the registration motor 58 or the paper feed motor 74 in the 1.4 × a period of each paper transport speed v1 or v2 (mm / s). Represents the amount (mm). The paper feed amount (mm) of b is such that the leading end of the paper P is
Corresponds to the rotational position or time (t) of the impression cylinder 20 immediately before the collision. The horizontal axis indicates the paper feed amount x
Instead of (mm), time (t) may be taken and expressed.

Here, FIGS. 34 (A) and 34 (B) show the case where the paper P does not slip by the pair of registration rollers 33a and 33b and the peripheral speed of the impression cylinder 20 does not fluctuate due to various loads and the like. FIGS. 35A and 35B show a control example of the sheet transport speed v1 or v2 (mm / s). FIGS. 35A and 35B show slips b1 (mm) of the sheet P caused by the pair of registration rollers 33a and 33b, 36A and 36B show control examples of each sheet conveying speed v1 or v2 (mm / s) when the peripheral speed of the sheet does not fluctuate due to various loads, etc. FIGS. And the sheet transport speed v1 when the peripheral speed of the impression cylinder 20 fluctuates to the plus side due to various loads or the like (a1 (mm / s)).
Alternatively, a control example of v2 (mm / s) is shown.

First, in the case where the slip of the paper P does not occur between the pair of registration rollers 33a and 33b and the peripheral speed of the impression cylinder 20 does not fluctuate, as shown in FIGS. After the predetermined delay De has elapsed from the start of the registration motor 58, that is, the start of rotation of the registration roller 33b, the paper feed motor 74 starts to rotate in the reverse direction, that is, the intermediate conveyance roller 55a starts to rotate in the reverse direction. At this time, the registration motor 58
3x is equivalent to 1.4 times the peripheral speed of the impression cylinder 20;
Rotation speed (pps) that becomes the paper conveyance speed v1 of a
And after the elapse of the delay De, the sheet feeding motor 74 also adjusts the intermediate conveyance roller 55a to a sheet conveyance speed v of 1.4 × a corresponding to 1.4 times the peripheral speed of the impression cylinder 20.
2 (that is, the paper transport speed v1 = the paper transport speed v2 = 1.
4 x a (mm / s)). Next, the registration motor 58
Is driven to rotate at a rotation speed (pps) such that the registration roller 33b has the same paper conveyance speed v1 as the peripheral speed of the impression cylinder 20, and similarly, the paper feed motor 74 controls the intermediate conveyance roller 55a The same paper transport speed v as the peripheral speed of 20
2 (ie, the paper transport speed v1 = the paper transport speed v2 = a).
(Mm / s)).

The circumferential speed of the impression cylinder 20 is
Is determined by the rotation speed (peripheral speed) according to the set print speed value set by the print speed setting key 96 or automatically set. Here, a paper transport speed v1 (m) of 1.4 × a corresponding to 1.4 times the peripheral speed of the impression cylinder 20 is used.
m / s), the rotation speed (pps) of the registration motor 58 for rotating the registration roller 33b is, for example, 3rd speed (90 rpm) where the set printing speed is the standard printing speed.
For example, if the outer diameter of the impression cylinder 20 is 180 mm and the outer diameter of the registration roller 33b is 28 mm, the paper transport speed v1 = 1.
153.6 (mm / s) and the rotation speed of the registration motor 58 = 3672 (pps) (however, the registration roller 33b is increased in speed by the driving pulley 33A).

The intermediate transport rollers 55a are controlled so that the paper transport speed v2 (mm / s) is the same as the peripheral speed of the impression cylinder 20.
The rotation speed (pps) of the feed motor 74 for rotating
For example, if the set print speed is 3rd speed (90r) which is the standard print speed
pm), the outer diameter of the impression cylinder 20 is 180 mm, and the outer diameter of the intermediate conveyance roller 55a is 20 mm.
mm, the paper transport speed v
2 = 1102.71 (mm / s), registration motor 58
Becomes 3510 (pps).

Next, slip b1 (mm) of the paper P is generated by the pair of registration rollers 33a and 33b, and
In the cases shown in FIGS. 35 (A) and (B) where the peripheral speed of the sheet P does not fluctuate, compared to the cases shown in FIGS. The registration motor 58 and the sheet feeding motor 74 are arranged so that the registration roller 33b and the intermediate conveyance roller 55a have a paper conveyance speed v of 1.4 × a corresponding to 1.4 times the peripheral speed of the impression cylinder 20.
The only difference is that they are rotationally driven at rotational speeds (pps) corresponding to 1 and v2.

Further, the slip of the paper P does not occur between the pair of registration rollers 33a and 33b, and the peripheral speed of the impression cylinder 20 fluctuates to the plus side due to various loads or the like.
s) In the case shown in FIGS. 36A and 36B, FIG.
Compared to the cases of (A) and (B), the registration motor 5
8 and the paper feed motor 74 cause the variation a1 in the peripheral speed of the impression cylinder 20.
(Mm / s), that is, each paper transport speed v1, v2 = (1.4 × a + a1) (mm / s), and is driven to rotate at an increased speed (pps). The only difference is that. Note that the actual operation of transporting the paper P is performed under a condition in which the respective states illustrated in FIGS. 34 to 36 are combined.

Under the encoder feedback control FBC performed by the main body paper feed control device 88, the paper P is rotated by the registration motor 58 and the paper feed motor 74 as described above, and the peripheral speed of the impression cylinder 20 is reduced to one. When the sheet clamper 21 of the impression cylinder 20 is conveyed at each of the sheet conveyance speeds v1 and v2 of.
1 and becomes the same speed as the peripheral speed of the impression cylinder 20. The paper clamper 21 of the impression cylinder 20 is shown in FIGS.
A predetermined timing shown in FIG.
Occupies the rotational position θ ′ = 350.5 °).

In accordance with this timing, the paper clamper 21 of the impression cylinder 20 is moved to the position shown in FIG.
As shown in FIG. 7, after the front end of the paper P is gripped and clamped, the paper clamper 21 is closed (in a practical example,
When the impression cylinder 20 occupies the rotation position θ ′ = 10 ° (370 °)), the impression cylinder 20 rotates while holding the sheet P on the outer peripheral surface of the impression cylinder 20, and the leading end of the sheet P It is conveyed to the printing section between the outer peripheral surface of the cylinder 1 and the outer peripheral surface of the impression cylinder 20.

As described above, the paper feed amount by which the registration motor 58 and the paper supply motor 74 feed the paper P in one pulse and the outer peripheral movement amount of the impression cylinder 20 corresponding to one pulse width of the encoder 60 are set to be the same. Have been. This allows
For example, the main body paper feed control device 88 detects the time required for one pulse width of the encoder 60 fixed to the impression cylinder 20 with the timer in the main body paper feed control device 88, and detects the time required for the load variation on the impression cylinder 20 side. When the time required for one pulse of the encoder 60 becomes longer, the registration motor 58 and the paper feed motor 74 are respectively decelerated. Conversely, the main body paper feed control device 88 performs feedback control to increase the speed of the registration motor 58 and the paper feed motor 74 when the time required for one pulse of the encoder 60 becomes short.

In other words, the registration roller pair 33a, 3
Since the advance or delay of the leading end of the sheet P sent from the sheet feed roller 3b is sequentially detected, the sheet conveying speed (feeding speed of the sheet P) between the pair of registration rollers 33a and 33b and the pair of intermediate conveying rollers 55a and 55b is corrected. is there. The main body paper feed control device 88 always tracks the peripheral speed of the impression cylinder 20 with a pulse variation detected by the encoder sensor 61 as rotation unevenness due to a load variation or the like of the impression cylinder 20. Feedback control using the above-described pulse encoder is performed in which both the rotation speeds of the motor 58 and the sheet feeding motor 74 are variably controlled. At this time, the impression cylinder 20
Is detected by the number of pulses detected by the encoder sensor 61, and the peripheral speed of the impression cylinder 20 is detected by the cycle time t detected by the encoder sensor 61.
As shown in FIG. 22, the main body sheet feeding control device 88 further changes the driving pulse widths (t _{1 to} t ₄ ) output to the registration motor 58 and the sheet feeding motor 74, respectively. The motor 74 is feedback-controlled to reduce registration deviation and improve print registration accuracy. (See step S20).

Under the encoder feedback control by the main body sheet feeding control device 88, the registration roller 33b is rotated in the counterclockwise direction so that the upper registration roller 33a is rotated clockwise through the sheet P. , And at the same time, by rotating the intermediate transport roller 55a in the counterclockwise direction, the intermediate transport roller 55b is driven to rotate clockwise through the paper P, The deflection PA of the paper P gradually disappears. Then, it is detected that the rear end of the sheet P has passed through the intermediate sensor upper portion 53, and when the intermediate sensor upper portion 53 is turned off, the reverse rotation drive of the sheet feeding motor 74 is stopped, so that the intermediate transport roller pair 55a, 55
The assist rotation of b stops. Next, the rotational position of the plate cylinder 1 is θ = 75 ° (the rotational position of the impression cylinder 20 is θ = 75 °).
°), the registration motor 58
Is stopped, the rotation of the pair of registration rollers 33a and 33b is stopped, and the process proceeds to the sheet feeding state management routine. (See steps S22 to S25).

In step S16, if the size of the sheet that does not require the intermediate conveyance roller pair 55a, 55b to be assisted to rotate is smaller than B5, the process proceeds to step S23, and the same operation as described above is performed. Is Subsequent operations are the same as the operation of transporting the paper from the auxiliary paper supply unit 28 and the printing process, and thus the description thereof is omitted.

As described above, according to the first embodiment, the following advantages can be obtained in addition to the advantages described above and the effects of the present invention described later. In the conventional apparatus, the separation roller 3
2 and the plate cylinder 1
In addition, since the rotational driving force from the main motor for rotating the impression cylinder 20 is obtained by a sector gear system via a belt, a clutch, or the like, each of the sheet feeding means 29, 29-1, and
The rotational peripheral speeds of the separation roller 32 and the call roller 30 of 29-2 depended on the printing speed which constantly changed slightly, and the amount of deflection of the above-mentioned bending PA was different for each of the changing printing speeds. Will be. As a result, in the conventional apparatus, skew occurs due to insufficient bending amount, non-feed occurs, or noise occurs due to excessive bending amount. On the other hand, in the first embodiment, first, the main body paper-supplying light-shielding plate 68 and the paper supply start sensor 65 for setting the timing for feeding the leading edge of the paper P to the pair of registration rollers 33a and 33b. Is disposed on the impression cylinder 20 side, and the main motor 15
While the separation roller 32, the call roller 30, and the pair of intermediate conveyance rollers 55a and 55b are being rotated by the paper feed motor 74, which is a stepping motor disposed independently of the paper feed motor 0, the amount of deflection is adjusted using the paper leading edge sensor 51. By doing so, the amount of deflection can be adjusted stably regardless of the printing speed. Thereby, skew and non-feed can be reduced, and noise can be reduced.

Secondly, the use of paper sheets having different paper qualities and paper thicknesses results in different friction coefficients of the paper P with respect to the pair of registration rollers 33a and 33b. , The change in the transport conditions (for example, the change in the coefficient of friction between the pair of registration rollers 33a, 33b and the paper P and the deformation state of the paper P) due to the change in environmental conditions such as temperature and humidity. Alternatively, when the pair of registration rollers 33a, 33b is worn or worn, becomes dirty with paper dust, or deteriorates with time, the slip amount of the sheet P increases (the slip of the sheet P is reduced by the pair of registration rollers 33a, 33b). (The time when the leading end of the sheet P starts to be conveyed by the rotation of...) Is detected by the registration sensor 52. A main body resist light-shielding plate 69 and a paper feed start sensor 65 for timing the feeding of the leading end of the paper P to the paper clamper 21 are arranged on the impression cylinder 20 side, and the main body paper feed control device 88 The slip amount is corrected based on the signal from the sensor 52 and the pulse encoder (the encoder 60 and the encoder sensor 6) is corrected.
1) feedback control F of the registration motor 58
By performing the BC, a stable paper grip is realized such that the leading end of the paper P is accurately and reliably clamped by the paper clamper 21, so that the paper P is prevented from winding up and the like. To stabilize the feeding timing and improve the reliability.
As a result, the resist accuracy can be further improved.

Third, since the registration driving means is constituted by the registration motor 58 composed of a stepping motor, there is no need to use mechanical parts for regulating the rotation and the rotation direction of the registration roller pair 33a, 33b. The responsiveness at the time of driving 58 can be improved. Further, the drive system for driving the pair of registration rollers 33a and 33b is made independent of the main motor 150 for driving the plate cylinder 1 and the impression cylinder 20, so that the load on the drive system can be reduced and the power of the main motor 150 can be further increased. It can be made small and inexpensive. Further, the program of the control device can be simplified, and the arithmetic processing can be accelerated to increase the tracking accuracy of the feedback control FBC.

Fourth, since the paper feed drive means and the paper transport drive means are constituted by the paper feed motor 74 composed of a stepping motor, mechanical parts for regulating the rotation direction of the separation roller 32 are unnecessary, and the cost can be reduced. Responsiveness at the time of driving the paper feed motor 74 can be improved. Further, the separation roller 32, the call roller 30, and the intermediate conveyance roller pair 5
The drive system for driving 5a, 55b is independent of the main motor 150 for driving the plate cylinder 1 and the impression cylinder 20, so that the load on the drive system can be reduced, and the power of the main motor 150 is further reduced to reduce the cost. Can be manufactured. Further, the program of the control device can be simplified, and the arithmetic processing can be accelerated to increase the tracking accuracy of the feedback control FBC.

(First Modification) FIG. 19 shows a first modification.
This modification 1 is different from the first embodiment shown in FIGS. 1 to 36 in that a paper type input key as a paper type setting means for setting the type of paper P as shown in FIGS. The main difference lies in that a 190 is newly added and that a main body feed control device 88A is provided instead of the main body feed control device 88.

Among stencil printing apparatuses, among the stencil printing apparatuses, the types (paper types) of paper P to be used are diversified. ing. Due to the difference between these paper types, there is considerable variation in the slip amount between the pair of registration rollers 33a and 33b. Only by starting the registration motor 58 in the same manner based on the ON output signal, the paper P cannot be stably conveyed. In view of this, in the first modification, the drive start time of the delay Db in FIGS. A function as a variable resist driving start varying means is added to the main body sheet feeding control device 88A.

The control content of the first modification will be briefly described as follows. For example, the paper type to be used is set by appropriately pressing the paper type input key 190, and is input to the main body paper feed control device 88A.
In order to change the start timing of the registration motor 58 in accordance with the type of paper, A starts the drive of the delay Db triggered by the timing of the ON output signal due to the engagement of the main body registration light-shielding plate 69 and the paper feed start sensor 65. Control to change the time point is performed. For example, when the paper P is used, the main body paper feed control unit 88A controls the delay Db to change from large to small as the thickness of the paper P increases from thin paper to thick paper. You do it. However, if the paper type is thick paper such as drawing paper or postcards,
The paper drum 21 does not clamp the leading end of the drawing paper, and the impression cylinder 2 on the front side of the leading end of the paper clamper 21
The delay Db is made large in order to control the feeding to the outer peripheral surface of the zero.

In view of the above, especially the auxiliary sheet feeding section 28
In the case of paper feeding from a paper feeder, even when using fresh paper, high-quality paper, sashimi paper, or envelopes, by setting the optimum range of the delay Db by, for example, experiments, the main body paper feeding control device 88A can control the delay Db. Delay Db
Can be arbitrarily varied to perform optimal control.
On the other hand, in the paper feeding from the bank paper feeding unit 200, there is almost no use when using a postal paper or an envelope. Control is applicable.

(Modification 2) FIG. 19 shows a modification 2.
As shown in FIG. 19, the second modification differs from the first modification in that a paper type detection unit as a paper type detection unit for automatically detecting the type of paper P in place of the paper type input key 190 is provided. Sensor 195, paper type detection sensor 195-1 on the bank,
Having a bank under sheet type detection sensor 195-2; and
The main difference is that it has 8B.

Each paper type detection sensor 195, 195-1, 1
As a specific example of 95-2, for example, a type in which the intensity of transmitted light is detected optically to detect the thickness of the paper P, or a roller is used to mechanically measure the paper thickness. Examples include a type in which the gap is enlarged and detection is performed by an electric sensor. In the second modification, a function as a registration drive start variable unit that changes the drive start time of the delay Db is added to the main body paper feed control device 88B in order to change the start timing of the registration motor 58 according to the paper type. . The details of the control of the second modification can be immediately analogized to the contents of the first modification, and can be easily implemented.

As a setting method of the delay Db in the first and second modifications, there are a setting method based on time and a setting method utilizing rotation position detection of the impression cylinder 20 by a pulse encoder having the encoder sensor 61. Modifications 1 and 2
In the above, since each of the main body paper feed control devices 88A and 88B is constituted by a microcomputer, the delay Db is controlled by the timer built in the microcomputer.
, The delay Db can be variably controlled.

(Modification 3) Referring to FIGS. 1 to 36,
Modification 3 of Embodiment 1 will be described. The third modification is different from the first embodiment in that the main body light-shielding plate 68, the main body resist light-shielding plate 69, the bank paper-shielding light-shielding plate 70, the bank resist light-shielding plate 71 in the first embodiment, The sensor 65, the bank feed start sensor 66, the incremental encoder 60, and the encoder sensor 61 are removed and replaced with these. As shown in FIG. 37, the rotation speed fluctuation and the position of the impression cylinder 20 can be detected. The only difference is that an absolute-type pulse encoder (hereinafter, referred to as an “absolute-type pulse encoder”) for detecting an absolute rotation amount is disposed on the impression cylinder 20 side.

As shown in FIG. 37, the above-mentioned absolute type pulse encoder is attached to the end plate 20b of the impression cylinder 20, and has a multi-channel photo encoder 220 in which a number of slits are radially arranged on the outer periphery in a plurality of stages. The arm 25 sandwiches the outer periphery of the photo encoder 220.
b, and a plurality of encoder sensors 221 attached to b.

The control operation in the third modification is the same as that of the first embodiment and the first and second modifications and the light-shielding plate 6 for feeding the main body.
8, main body resist light shield plate 69, bank paper light shield plate 7
0, light blocking plate 71 for bank resist, paper feed start sensor 6
5. The only difference is that the above-described operations of the bank paper feed start sensor 66, the incremental encoder 60, and the encoder sensor 61 are performed by one absolute pulse encoder. In addition, based on what was described in the first embodiment and the first and second modifications, the output start point of the output pulse signal from the encoder sensor 221 when the impression cylinder 20 occupies the predetermined rotation position and the feed motor 74 The output of the output pulse signal from the encoder sensor 221 when the impression cylinder 20 further rotates and occupies a predetermined rotation position different from that described above is delayed by a certain delay Da between the start of driving and the start of driving. A fixed delay Db is provided between the time and the drive start time when the registration motor 58 starts to be driven, and the above-described delays Dc, Dd, De, Df, and the like are provided.

Therefore, according to the third modification, each of the above-mentioned advantages of the first embodiment and the first and second modifications (however,
In the above-mentioned advantages and effects to be described later, the light-shielding plate 68 for main body feeding, the light-shielding plate 69 for main body resist, the light-shielding plate 70 for bank feeding, the light-shielding plate 71 for bank resist, the paper-feed start sensor 6
5, the terms of the bank paper feed start sensor 66, the incremental encoder 60, and the encoder sensor 61 are appropriately replaced with the photo encoder 220 and the encoder sensor 221 of the absolute type pulse encoder. Although complicated control is required, the number of components in the control configuration can be reduced.

As described above, the present invention has been described with reference to the specific embodiments including the examples. However, the configuration of the present invention is not limited to the above-described first embodiment and the first to third modifications. It is obvious to those skilled in the art that various embodiments and examples can be configured according to the necessity and application within the scope of the present invention.

[0213]

As described above, according to the present invention, it is possible to solve the above-mentioned problems of the conventional apparatus and to provide a novel paper feeding apparatus in a printing apparatus.
The effects of each claim are as follows. According to the first aspect of the invention, the control means controls the registration driving means to compensate for slippage of the paper in the registration means based on the signal from the paper leading end detection means, and then outputs the output pulse signal from the encoder sensor. Based on the timing, the control unit controls the registration driving unit to feed the leading edge of the sheet in synchronization with the rotation position of the holding unit, and adjusts the distance between the registration unit and the sheet conveyance unit in accordance with the respective controls of the registration driving unit. By controlling the paper transport driving means to maintain the deflection, the paper formed between the registration means and the paper transport means becomes excessively bent when the registration means is feeding out the paper, so that the paper is bent. It does not occur, and the deflection of the paper causes the paper feed amount to be insufficient. It is possible to reliably prevent the paper from being rolled up due to a holding error (clamp error) in the holding means (paper clamper), and to stabilize the timing of feeding the leading edge of the sheet to the holding means and to improve reliability. And the resist accuracy can be further improved.

Further, the use of paper having different paper qualities and paper thicknesses results in a difference in the friction coefficient of the paper with respect to the registration means, or the use of a paper type (paper type) having the same paper qualities and paper thicknesses. However, the transfer means may change due to changes in environmental conditions such as temperature and humidity (for example, a change in the coefficient of friction between the resist means and the sheet or a deformed state of the sheet), or the resist means may be worn or worn. Stable holding of the leading edge of the paper is possible because the leading edge of the paper can be detected by the paper leading edge detecting means when the amount of slip of the paper increases due to contamination or deterioration with time due to paper dust or the like. (Clamping) can be realized, and stable holding can be realized even for mechanical variations between machines.

According to the second aspect of the present invention, the delay time is provided between the activation of the registration means and the activation of the sheet conveying means. It is possible to prevent breakage of the sheet which may occur when the drive unit and the sheet transporting unit are started to be driven at the same start timing, thereby preventing the printed sheet from being broken.

According to the third aspect of the present invention, the registration driving means is constituted by a stepping motor, and the control means controls the registration driving means by changing at least the number of driving pulses output to the registration driving means. In addition to the effects of the invention according to claim 1 or 2, a mechanical device for restricting the brake and rotation direction of the registration means is not required, so that it is inexpensive, the response at the time of driving the registration driving means is improved, and the control device is improved. Can be simplified, and the arithmetic processing can be sped up to increase the tracking accuracy of the feedback control.

According to the fourth aspect of the present invention, the paper transport drive means is constituted by a stepping motor, and the control means controls the paper transport drive means by changing at least the number of drive pulses output to the paper transport drive means. Therefore, in addition to the effects of the invention described in claim 1, 2, or 3,
Inexpensive because there is no need for mechanical parts for regulating the paper transport means and the rotation direction, the responsiveness at the time of driving the paper transport drive means is improved, the program of the control device can be simplified, and the arithmetic processing can be performed quickly. Thus, the tracking accuracy of the feedback control can be increased.

According to the fifth aspect of the present invention, the control means performs feedback control of the registration driving means by further changing the pulse width in accordance with the output pulse signal from the encoder sensor after the paper slip is compensated.
In addition to the effect of the third aspect of the invention, the tracking accuracy of the feedback control can be further increased.

According to the sixth aspect of the present invention, after the paper slip is compensated, the control means performs feedback control of the paper transport driving means by further changing the pulse width according to the output pulse signal from the encoder sensor. ,
In addition to the effect of the invention described in claim 4, the following accuracy of the feedback control can be further improved.

According to the seventh aspect of the present invention, a delay time is provided between the output start point of the output pulse signal from the encoder sensor and the drive start point when the driving of the registration drive unit is started. In addition to the effect of the invention described in claim 1, 2 or 3, by providing a resist drive start varying means for varying the drive start time so as to change the delay time in accordance with the present invention, it is possible to stably produce various kinds of paper. Holding (clamping) of the tip can be realized.

According to the eighth aspect of the present invention, the timing detecting means for determining the timing of feeding the leading end of the sheet by the registration means to the holding means is disposed on the impression cylinder side, so that each of the above inventions is provided. In addition to the effects described above, the feeding timing can be stabilized and the reliability can be improved.

According to the ninth aspect of the present invention, a delay time is provided between the time when the output of the ON output signal from the timing detecting means is started and the time when the driving of the registration driving means is started. 9. In addition to the effect of the invention according to claim 8, the resist driving start variable means for changing the driving start time to change the delay time according to Holding (clamping) can be realized.

According to the tenth aspect of the present invention, the control means is provided with the function of the registration driving start varying means, and in addition to the effect of the seventh or ninth aspect, versatility of control is provided. Can be enhanced.

According to the eleventh aspect of the present invention, by providing the paper type setting means for setting the type of paper,
By manually setting and inputting the type of paper, the effect of the invention according to claim 7, 9 or 10 is achieved.

According to the twelfth aspect of the invention, by providing the paper type detecting means for detecting the type of paper,
7. The method according to claim 7, wherein the paper type is automatically detected.
0 produces the effects of the invention described in

[Brief description of the drawings]

FIG. 1 is a schematic front view of a stencil printing apparatus and a bank paper feed unit according to a first embodiment of the present invention.

FIG. 2 is a schematic enlarged front view of the stencil printing apparatus according to the first embodiment.

FIG. 3 is a plan view around an auxiliary sheet feeding unit of the stencil printing apparatus according to the first embodiment.

FIG. 4 is a partial cross-sectional front view of the periphery of an auxiliary sheet feeding unit of the stencil printing apparatus according to the first embodiment.

FIG. 5 is a cross-sectional view of a main part around a flexure forming unit that forms a flexure on a sheet fed from an auxiliary paper feed unit.

FIG. 6 is a cross-sectional view of a main part around a flexure forming unit that forms a flexure on a sheet fed from a bank paper feed unit.

FIG. 7 is an exploded perspective view of a main part showing a mounting structure of control components around the impression cylinder in the first embodiment.

FIG. 8 is a plan view of a main part in FIG. 7;

FIG. 9 is a perspective view around a home position sensor in the plate cylinder.

FIG. 10 is a perspective view showing an attachment structure of control components around a resist unit in the first embodiment.

FIG. 11 is an exploded perspective view showing a mounting structure of control components around an arm pair of the impression cylinder in the first embodiment.

FIG. 12 is a schematic front view illustrating a rotation position of a paper clamper and a paper conveyance operation according to a rotation operation of the impression cylinder in the first embodiment.

13A is a schematic diagram illustrating a rotation position of a plate cylinder according to the first embodiment, and FIG. 13B is a schematic diagram illustrating a rotation position of an impression cylinder.

FIG. 14 is a perspective view of a main part showing a paper size detection mechanism such as an auxiliary tray in the first embodiment.

FIG. 15 is a front cross-sectional view of a main part showing a configuration of a bank sheet feeding unit according to the first embodiment.

FIG. 16 is a perspective view of a main part showing a bank paper feed drive mechanism of the bank paper feed unit according to the first embodiment.

FIG. 17 is a plan view of a main part of the operation panel according to the first embodiment.

18 is a plan view showing a switching display screen of an LCD display unit of the operation panel in FIG.

FIG. 19 is a block diagram illustrating a sheet feeding control configuration according to the first embodiment and the like.

FIG. 20 is a timing chart illustrating an entire sheet feeding operation according to the first exemplary embodiment.

FIG. 21 is a timing chart illustrating a sheet feeding operation from an auxiliary sheet feeding unit according to the first exemplary embodiment.

FIG. 22 is an explanatory diagram illustrating the contents of changing the number of drive pulses and the pulse width in the first embodiment.

FIG. 23 is a front view of a main part illustrating a sheet conveying operation when the sheet feeding unit and the intermediate conveying roller pair are activated in the first embodiment.

FIG. 24 is a front view of a main part illustrating an operation of forming a sheet bend between the registration unit and the sheet feeding unit or between the registration unit and the pair of intermediate conveyance rollers according to the first exemplary embodiment.

FIG. 25 is a front view of a main part showing a sheet conveyance operation when the registration roller is activated or the assist rotation of the intermediate conveyance roller pair according to the first embodiment.

FIG. 26 is a front view of a main part illustrating a transport operation of a leading end of a sheet to a sheet clamper in the first embodiment.

FIG. 27 is a front view of a main part illustrating a sheet transport operation at the beginning of printing according to the first embodiment.

FIG. 28 is a flowchart illustrating an entire sheet feeding operation according to the first exemplary embodiment.

FIG. 29 is a flowchart illustrating the paper feeding operation continued from FIG. 28.

FIG. 30 is a flowchart illustrating a sheet feeding operation in a bank sheet feeding unit according to the first embodiment.

FIG. 31 is a flowchart showing the paper feeding operation following FIG. 30;

FIG. 32A shows a state in which paper is supplied from a paper supply unit on a bank.
Paper size A4 in the vertical paper path near the registration roller
The paper transport path of the paper (thick solid line) from the leading edge to the trailing edge of the paper when the deflection is formed at the leading edge of the paper
(B) shows the paper transport path for the paper (thick solid line) from the leading edge to the trailing edge of the sheet when the leading edge of the sheet of the same sheet size A4 is bent by sheet feeding from the sheet feeding unit below the bank. It is a schematic front view.

FIG. 33A shows a state in which paper is supplied from a paper supply unit on the bank.
Paper size A3 in the vertical paper path near the registration roller
The paper transport path of the paper (thick solid line) from the leading edge to the trailing edge of the paper when the deflection is formed at the leading edge of the paper
(B) shows the sheet transport path of the sheet (thick solid line) from the leading end to the trailing end of the sheet when the leading end of the sheet of the same sheet size A3 is bent by sheet feeding from the sheet feeding unit below the bank. It is a schematic front view.

FIGS. 34A and 34B both show an example of controlling the paper transport speed when the slippage of the paper by the registration roller does not occur and the peripheral speed of the impression cylinder does not fluctuate due to various loads and the like. FIGS. 3A and 3B are diagrams illustrating an example in which the sheet conveyance speed of a registration roller is controlled, and FIG. 2B is a diagram illustrating an example in which the sheet conveyance speed of an intermediate conveyance roller is controlled.

FIGS. 35A and 35B are lines representing control examples of the respective sheet conveyance speeds when the slippage of the sheet occurs at the registration roller and the peripheral speed of the impression cylinder does not fluctuate due to various loads and the like. FIG. 4A is a diagram illustrating an example of controlling the paper transport speed of a registration roller, and FIG. 4B is a diagram illustrating an example of controlling the paper transport speed of an intermediate transport roller.

FIGS. 36 (A) and (B) show the sheet conveyance speeds when the circumferential speed of the impression cylinder fluctuates to the plus side due to various loads and the like, without causing the slippage of the sheet by the registration rollers. FIGS. 7A and 7B are diagrams illustrating a control example, in which FIG. 7A is a diagram illustrating an example of controlling a sheet conveying speed of a registration roller, and FIG. 8B is a diagram illustrating an example of controlling a sheet conveying speed of an intermediate conveying roller.

FIG. 37 is an exploded perspective view of a main part showing a mounting structure of control components around an impression cylinder in a third modification.

[Explanation of symbols]

Reference Signs List 1 plate cylinder 2 master 20 impression cylinder 21 paper clamper 28 as holding means 28 auxiliary paper feeding section 29, 29-1, 29-2 paper feeding means 33a, 33b registration roller pair 55a, 55b as registration means 55a, 55b as paper conveyance means Intermediate conveyance roller pair 58 Registration motor 65 as registration drive means 65 Feed start sensor as timing detection means 66 Bank feed start sensor 74 as feed timing detection means 74 Paper feed motor as paper conveyance drive means 88 Control means Main body paper feed control device 100 Stencil printing device as printing device 148 Bank paper feed control device 200 Bank paper feed unit 201 Upper bank paper feed unit constituting bank paper feed unit 202 Lower bank paper feed unit constituting bank paper feed unit P paper PA deflection RX horizontal paper feeding path as R paper feeding path RZ vertical feeding as paper feeding path Paper path

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3F049 EA10 EA22 EA24 EA28 LA06 LB03 3F343 FA02 FB05 FC15 JA01 JD08 KB06 MA04 MA15 MA33 MA35 MB15 MC06 MC08

Claims (12)

[Claims] 1. A plate cylinder for winding a master made on an outer peripheral surface thereof, and an impression cylinder having a holding means for holding a leading end portion of a fed sheet and having an outer diameter substantially equal to the outer diameter of the plate cylinder. A registration unit that feeds the leading end of the sheet toward the holding unit; a bank paper feeding unit that feeds the paper toward the registration unit; and a paper feeding path between the registration unit and the bank paper feeding unit. A sheet feeding device for a printing apparatus, comprising: a sheet conveying unit that sends out a leading end of a sheet fed from the bank sheet feeding unit toward the registration unit and abuts the registration unit to form a deflection. A registration driving unit that drives the registration unit; a sheet conveyance driving unit that drives the sheet conveyance unit; and a control unit that controls a timing of feeding a leading end of the sheet to the holding unit. Small A pulse encoder having at least an encoder sensor for detecting fluctuations in rotation speed; a sheet leading end detecting unit disposed in a sheet feeding path between the impression cylinder and the registration unit to detect a leading end of the sheet; After controlling the registration driving means to compensate for slippage of the paper in the registration means based on a signal from the paper leading end detection means, the timing is adjusted to the rotational position of the holding means based on an output pulse signal from the encoder sensor. Controls the registration driving means to feed the leading end of the sheet, and maintains the deflection between the registration means and the sheet conveyance means in accordance with each control of the registration driving means. Control means for controlling the paper transport drive means in order to provide the paper feed device in the printing apparatus. 2. A feeder according to claim 1, wherein a delay time is provided between the start of said registration means and the start of said paper transport means. Paper equipment. 3. The sheet feeding device in a printing apparatus according to claim 1, wherein said registration driving means comprises a stepping motor, and said control means changes at least the number of driving pulses output to said registration driving means. A sheet feeding device in the printing apparatus, wherein the sheet feeding device controls the registration driving means. 4. The paper feeding device in a printing apparatus according to claim 1, wherein said paper transport driving means comprises a stepping motor, and said control means comprises at least a drive output to said paper transport driving means. A paper feeder in a printing apparatus, wherein the paper transport drive unit is controlled by changing the number of pulses. 5. The paper feeding device according to claim 3, wherein the control unit further comprises: changing the pulse width after compensating for the slippage of the sheet, in response to an output pulse signal from the encoder sensor. And a feeder in the printing apparatus, wherein the registration driving means is feedback-controlled. 6. The paper feeder in a printing apparatus according to claim 4, wherein said control means, after compensating for the slippage of said paper, further changes said pulse width while responding to an output pulse signal from said encoder sensor. And a sheet feeding device in the printing apparatus, wherein the sheet feeding driving means is feedback-controlled. 7. A sheet feeding device in a printing apparatus according to claim 1, wherein a time point at which output of an output pulse signal from said encoder sensor is started and a time point at which said registration driving means starts driving are started. A sheet feeding device for a printing apparatus, comprising: a registration drive start varying unit that varies a delay time according to a type of the sheet by providing a delay time therebetween. 8. A sheet feeding device in a printing apparatus according to claim 1, wherein timing detecting means for setting a timing for feeding the leading end of said sheet by said registration means to said holding means. Is provided on the impression cylinder side in the printing apparatus. 9. A sheet feeding device in a printing apparatus according to claim 8, wherein a delay is caused between a time point when the output of the ON output signal from the timing detecting means is started and a time point when the driving of the registration driving means is started. A sheet feeding device in a printing apparatus, comprising: a registration drive start varying unit that provides a time and changes the drive start time so as to change the delay time according to the type of the sheet. 10. The paper feeding device according to claim 7, wherein the control unit has a function of the registration drive start varying unit. 11. A paper feeding device for a printing apparatus according to claim 7, further comprising a paper type setting means for setting the type of said paper. 12. A paper feeding device in a printing apparatus according to claim 7, further comprising a paper type detecting means for detecting a type of said paper.