JP2014233906A - Printing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing device using a rolled long sheet as a recording medium, in which a wasteful non-image space between a preceding image and a succeeding image that are transcribed on the long sheet from a master is eliminated and contact of the long sheet with a clamper of the long sheet is prevented so as to perform easily plate-making and printing at low cost.SOLUTION: The printing device has a printing portion 2 that supplies ink from ink supply means and prints a plate-making image on a recording medium by pressing a master 8 for stencil printing on an aperture portion 5A by means of pressing means 6 at a printing position, which separates the pressing means therefrom after supplying ink to the long recording medium by contacting the pressing means therewith, then reversely rotates long recording medium paper feeding means 3 and long recording medium winding means 4 by a prescribed amount to perform a rewinding operation before a tip of the aperture portion having rotated reaches the printing position, and after the rewinding operation is completed positively rotates the means 3 and 4 to restart normal conveyance of the recording medium.

Description

  The present invention relates to a printing apparatus capable of printing on a long recording medium wound in a roll shape, and more particularly to a printing apparatus that performs printing using a stencil printing master.

Conventionally, digital thermal stencil printing is known as a simple printing method.
This is because a thermal head having a plurality of fine heating elements is brought into contact with a master obtained by bonding a thermoplastic resin film and a porous support, and the master is placed on a platen roller or the like while energizing the heating elements in a pulsed manner. After the perforated image based on the image information is hot-melt perforated and engraved on the master thermoplastic resin film by conveying with a conveying means, the perforated master is wound around a porous cylindrical plate cylinder and a press roller or the like By pressing the paper against the outer peripheral surface of the plate cylinder by the pressing means, the ink supplied to the inner peripheral surface of the plate cylinder by the ink supply means such as an ink roller is exuded from the plate cylinder opening portion and the master perforation portion, and exuded. A printed image is obtained on paper by transferring ink to the paper.

As a stencil printing apparatus, an apparatus that continuously performs an image reading operation, a plate making operation, a plate discharging operation, a winding operation, a plate attaching operation, and a printing operation is known.
According to this stencil printing apparatus, anyone can perform plate making in a short time with a simple operation at any time, and a large amount of printed matter can be obtained like a copying machine. In addition, the plate cost is inexpensive, and there is no worry of increasing the cost even when printing a small number of copies.
Furthermore, since the plate making is based on digital data, it is not necessary to hold the plate, and there is an advantage that the plate making can be performed immediately if there is image data.
However, the above-described stencil printing apparatus has a problem that the printing medium is limited to a sheet.
For this reason, in general, label printing or sticker printing using roll-like long paper of several tens of meters to several hundreds of meters cannot be performed using a stencil printing apparatus.

In such label printing and sticker printing, the sheet is inappropriate in consideration of the stability and productivity of conveyance, and further, it is necessary to perform a punching process or a separation process in the post-printing process. Furthermore, long paper is suitable.
For example, Patent Literature 1 and Patent Literature 2 disclose label printing apparatuses capable of performing such label printing.

The printing apparatus disclosed in Patent Document 1 can perform label printing using long paper or seal printing, but is not only large and expensive, but also requires skill in operation, It is difficult for low-level operators to handle easily.
In addition, because the plates used for printing are resin relief plates, gravure intaglio plates, offset plates, etc., these plate making requires a separate and expensive plate making apparatus, and skill is required for operation of this plate making apparatus. It becomes. For this reason, engraving is requested from a contractor dedicated to engraving, but there is a problem that time and cost are bulky and uneconomical.

In the printing apparatus disclosed in Patent Document 2, when the plate cylinder is driven to rotate, when the opening of the plate cylinder reaches a position corresponding to the press roller (pressing means), the press roller swings to the plate cylinder. The ink that is pressed and supplied from the ink container to the inner peripheral surface of the plate cylinder oozes out through the opening portion and the perforation portion of the master, and is transferred to a long paper to form a print image in the image area. When the press roller is separated from the outer peripheral surface of the plate cylinder, the operation of each motor is stopped and the feeding of the long paper is stopped.
The plate cylinder driving means (not shown) continues to operate even when the feeding of the long paper is stopped, and a predetermined time for the leading end of the opening portion of the plate cylinder to reach the nip portion between the press roller and the plate cylinder in the next rotation. Before, each motor is actuated again, and the feeding of the long paper is resumed.
When the opening portion of the plate cylinder reaches the nip position with the press roller, the press roller swings and presses against the plate cylinder, and a print image is formed in the image area of the long paper. It is described that by adjusting the predetermined time, it is possible to economically use long paper by appropriately adjusting the distance of a useless portion (DS) between images.
However, in Patent Document 2, the distance of a useless part (DS) between images cannot be completely set to “0”.

FIG. 11 shows the relationship among the plate cylinder opening, the paper length, the pressing range, and the pressing force in Patent Document 2.
Patent Document 2 states that “pressing means is pressed in correspondence with the opening portion of the plate cylinder”, and “long paper is intermittently conveyed corresponding to the opening portion of the plate cylinder”, and “opening portion “Range” = “Pressing range (printing pressure range)” = “Conveying range”.
Based on this premise, a case where a maximum image of A3 size is printed on A3 size paper will be described.

Patent Document 2 states that “when the press roller is separated from the outer peripheral surface of the plate cylinder, the operation of each motor is stopped and the feeding of the long paper is stopped”. Further, “each motor is actuated again a predetermined time before the opening of the plate cylinder reaches the position corresponding to the press roller, and the feeding of the long paper is resumed”.
In this case, the long paper is stopped at the stage where the length of the A3 size is conveyed, and the position where the leading edge of the next image is printed on the long paper by the next rotation is separated from the trailing edge of the previous image. Position.
The space between the rear end portion of the previous image and the front end portion of the next image becomes a useless portion (DS) where printing is not performed.

Next, the state of pressing by the press roller in the stencil printing apparatus will be described in some detail. In Patent Document 2, as shown in FIG. 11, “opening area range” = “pressing range” = “transporting range”. However, it is practically impossible to press the press roller abruptly with no positional deviation against the front end of the opening portion of the plate cylinder rotating at high speed.
Next, FIG. 12 is a diagram showing a relationship among a plate cylinder opening portion, a sheet length, a pressing range, and a pressing force in a stencil printing apparatus in which measures are taken to prevent ink pre-leakage and post-leakage.

In an actual stencil printing apparatus, as shown in FIG. 12, “opening area range” <“pressing range” = “conveying range”. This is mainly due to the following two reasons.
1) To prevent the master that is wound on the plate cylinder from being stressed during printing, and thereby preventing the master from being broken or wrinkled.
2) In order to prevent a problem that ink overflows between the master and the plate cylinder on the front end side and the rear end side in the circumferential direction of the plate cylinder opening portion, and slightly behind the front end portion of the plate cylinder opening portion and the rear end The press roller is brought into pressure contact even slightly behind the part. That is, if the press roller is not abruptly contacted / released with respect to the master, ink will overflow between the master and the plate cylinder at the front end side and the rear end side of the plate cylinder opening portion (however, In the range of the opening (paper size), the maximum printing pressure is uniformly applied to ensure printing.)

Accordingly, the press roller pressing means is in pressure contact with the portion (F) before the leading edge of the image area on the long paper and the portion (R) behind the trailing edge of the image area, and the paper is conveyed by that amount. Is done. That is, the useless portion (DS) between images increases by the amount of conveyance.
If the conveyance of the long paper is stopped when the front part F or the rear part R reaches the nip portion with the press roller in FIG. 12, the master on the plate cylinder tries to stop due to friction with the paper. On the other hand, since the plate cylinder side continues to rotate, there is a problem that stress is applied to the master and wrinkles are formed on the master or a problem of tearing occurs.

Further, a clamper for locking a master specific to the stencil printing apparatus on the plate cylinder is provided outside the pressing range by the press roller. The clamper protrudes in a convex shape on the peripheral surface of the cylindrical plate cylinder. For this reason, in order to avoid a collision with the clamper during rotation of the plate cylinder, the press roller performs an operation of temporarily retracting in the outer diameter direction when the clamper passes through the nip portion.
In the case where the recording medium is a sheet, it is possible to pass the sheet while avoiding the clamp portion by optimally adjusting the sheet conveyance timing with respect to the nip portion. However, in the case of long paper, since the paper is not interrupted, the paper always comes into contact with the clamper during one rotation of the plate cylinder, and there is a possibility that tears and wrinkles are formed in the contacted portion. For this purpose, the press roller performs the retreat operation described above.

  Also, when the clamper comes into contact with the press roller, the friction with the press roller becomes a load resistance, and similarly, there is a problem that the portion of the paper becomes a problem of tearing or wrinkling.

  The present invention has been made in order to solve the above-described problems, and in a printing apparatus using roll-shaped long paper (long recording medium) as a recording medium, a preceding image transferred from the master onto the long paper. The purpose is to provide a printing apparatus that can perform plate making and printing easily and at low cost by eliminating useless non-image space between the image and the subsequent image and preventing contact with a long paper clamper. And

  In order to achieve the above-mentioned object, the present invention comprises a stencil printing master having a perforated portion and a non-perforated portion in order along the circumferential direction and having a plate-making image formed thereon. A plate cylinder that is rotatably and detachably supported by the main body of the apparatus, and has an ink supply means inside; and a pressing means that can be contacted and separated from the plate cylinder at a printing position. By pressing the stencil printing master on the aperture through the recording medium by a pressing unit, ink is supplied from the ink supply unit to print a plate-making image on the stencil printing master on the recording medium. A printing section, a long recording medium feeding means for feeding a long recording medium drawn out from a long recording medium wound in a roll shape toward the printing section, and a long printed by the printing section Winding the recording medium into a roll A printing apparatus having a length recording medium winding means, wherein at least the opening portion front end portion and the opening portion rear end portion sequentially pass through the printing position during one rotation of the plate cylinder. The end of the aperture that has been moved away from the pressing means after the ink has been supplied to the long recording medium by bringing the pressing means into contact with the long recording medium. Before reaching the printing position, the long recording medium feeding unit and the long recording medium winding unit are reversed by a predetermined amount to perform a rewinding operation of the long recording medium, and the rewinding operation is performed. After the completion, the long recording medium feeding unit and the long recording medium winding unit are rotated forward again to resume normal conveyance of the long recording medium.

According to the present invention, printing on long paper can be easily performed by stencil printing, so that seal printing and label printing using long paper can be performed at low cost.
Further, not only intermittently transporting long paper, but also reverse feeding in order to match the print image, it is possible to eliminate useless non-image portions between the print images that have been generated so far. For this reason, it is possible to cut what is printed on long paper into the same size as that of the sheet, and it is possible to obtain the same printed matter as when printed on the sheet, thereby reducing costs. .
Further, when the long paper is rewound, the contact between the long paper and the clamper or press roller on the plate cylinder can be prevented, and the paper is not torn and wrinkles are not caused.
In addition, since long paper is used, it is possible to prevent the occurrence of paper transport jams as compared with printing using sheet paper, and productivity can be increased.

1 is a schematic configuration diagram of a printing apparatus according to a first embodiment of the present invention. It is a configuration explanatory view of a mounting portion of the plate cylinder with respect to the apparatus main body. It is the figure which showed the stencil printing apparatus which can mount | wear with the plate cylinder used for a printing apparatus. It is the figure which showed the circumferential direction range of the opening part and non-opening part in a plate cylinder, and the circumferential direction positional relationship. It is the schematic which showed the state which conveys a long paper in the reverse direction after completion | finish of preceding image formation. It is the figure which showed the state which complete | finished the reverse conveyance of the long paper and stopped the long paper. (A) thru | or (d) is a figure explaining the printing operation by the printing apparatus of patent document 2. FIG. (A) thru | or (d) is a figure explaining the structure and operation | movement of a printing apparatus of the 1st Embodiment of this invention. (A) thru | or (d) is a structure and operation | movement explanatory drawing in the case of printing an A4 size platemaking image on a long paper by the conventional printing apparatus provided with the plate cylinder, the master made from platemaking, and the press roller. (A) thru | or (d) is drawing explaining the printing procedure by the printing apparatus of this invention, and the advantage accompanying it. 6 is a diagram illustrating a relationship among a plate cylinder opening portion, paper, a printing pressure range, and a pressing force in Patent Document 2. FIG. FIG. 3 is a diagram illustrating a relationship among a plate cylinder opening portion, a sheet, a printing pressure range, and a pressing force in a stencil printing apparatus in which measures are taken to prevent ink pre-leakage and post-leakage.

FIG. 1 is a schematic configuration diagram of a printing apparatus according to the first embodiment of the present invention.
The printing apparatus 1 includes a printing unit 2, a long paper feeding unit (long recording medium feeding unit) 3, a long paper winding unit (long recording medium winding unit) 4, and the like.
The printing unit 2 includes a drum-shaped plate cylinder 5, a press roller 6 as a pressing unit, and an ink supply unit to be described later.
The plate cylinder 5 is rotatably supported by the apparatus main body 17 and is driven to rotate by a plate cylinder driving means (not shown). The plate cylinder 5 has a clamper 7 that can be freely opened and closed on the outer peripheral surface thereof, and is fixed to the outer peripheral surface of the plate cylinder by pressing one end edge of a stencil master 8 that has been stenciled and wound around the outer peripheral surface of the plate cylinder 5. doing.

Inside the plate cylinder 5, an ink container 9 containing emulsion ink is detachably disposed. The ink inside the ink container 9 is supplied to a proximity portion between the ink roller 10 and the doctor roller 11 disposed inside the plate cylinder 5 by an ink pump (not shown) to form an ink reservoir 12. The ink container 9, the ink roller 10, the doctor roller 11, and the ink pump constitute ink supply means.
The ink in the ink reservoir 12 is supplied in a thin layer on the peripheral surface of the ink roller 10 when passing through the proximity of the ink roller 10 and the doctor roller 11. When the plate cylinder 5 is pressed by a press roller (pressing means) 6 which will be described later, the peripheral surface of the ink roller 10 and the inner peripheral surface of the plate cylinder 5 come into contact with each other so that ink is applied to the inner peripheral surface of the plate cylinder 5. Supplied.
The plate cylinder 5 is configured to be detachable from the apparatus main body 17 by guide rails 13 and 14 provided on the apparatus main body 17, and can be detached from the apparatus main body 17 by sliding it toward the front side in FIG. It is configured.

FIG. 2 is an explanatory diagram of the configuration of the mounting portion of the plate cylinder with respect to the apparatus body.
The two rails 37 and 38 extending in parallel from the frame 44 that rotatably holds the plate cylinder 5 are attached to and detached from the apparatus main body 17 by sliding relative to the guide rails 13 and 14 extending from the rear plate 41. It is configured freely. A driving force transmitting disc 39 that rotates integrally with the plate cylinder 5 is detachably fitted with a pin 40 a implanted in a driving disc 40 that is rotatably supported by the rear plate 41 of the apparatus body 17. A non-perforated hole is formed.
A rotational driving force from a plate cylinder driving means (not shown) provided in the apparatus main body 17 is transmitted to the driving disk 40 via a timing belt 42 and a timing pulley 43. With this configuration, when the plate cylinder 5 is mounted on the apparatus main body 17, a rotational driving force from a plate cylinder driving means (not shown) is transmitted to the plate cylinder 5, and the plate cylinder 5 is driven to rotate.

The frame 44 is provided with a plate-making image area storage means 45 for storing the plate-making image length in the long paper conveyance direction and its position. The information about the plate-making image length and the position of the plate-making master wound around the plate cylinder in the conveying direction of the long paper, which is stored in the plate-making image area storage means 45, is an image arranged on the apparatus main body 17 side. It is read by the information reading means 46.
Further, a rotary encoder (not shown) is disposed near the outer periphery of the plate cylinder 5 so that the position of the plate cylinder 5 in the rotation direction is sequentially output to the control means Cnt and managed as information.

A press roller 6 disposed below the plate cylinder 5 so as to freely advance and retract has an axial length substantially the same as the axial length of the plate cylinder 5, and an elastic body such as rubber is wound around the core portion. It has a configuration. The press roller 6 is rotatably supported by a pair of press roller arms (not shown) at both ends of the core portion. A pair of press roller arms (not shown) are integrally formed with each other, and are swung by a cam (not shown) that rotates in synchronization with the plate cylinder 5. Close to and away from the outer peripheral surface.
In the first embodiment, the press roller 6 is brought into contact with and separated from the opening portion of the plate cylinder 5 so that the peripheral surface thereof is in pressure contact with the non-opening portion.
In the vicinity of a cam (not shown), press roller locking means (not shown) for holding the press roller 6 at a spaced position where the press roller 6 is separated from the plate cylinder 5 is disposed.

A peeling unit 25 that discharges (injects) air is provided on the left side of the printing unit 2 (downstream in the paper conveyance direction). The peeling means 25 peels off the printing paper adhered to the plate cylinder by discharging air generated by a DC fan motor (not shown) from a tip portion toward the plate cylinder via a rubber hose (not shown). Further, the discharge timing of the air from the peeling means 25 is normally controlled so as to be discharged to the leading edge of the sheet (near the leading edge of the image).
As an air discharge method from the peeling means 25, a DC fan motor is directly installed on the peeling means, or a piston pump (not shown) is connected with a hose not shown, and air is discharged by driving the piston pump driving means. There may be.

A long paper feeding means (long recording medium paper feeding means) 3 is disposed upstream of the peeling means. The long paper feed unit 3 includes a long paper support unit (long recording medium support unit) 15, a long paper conveyance roller pair (long recording medium feed roller pair) 16, and the like.
The long paper support means 15 is formed in the apparatus main body 17, and is formed by winding a long paper (long recording medium) 18 in which a web made of plain paper or the like is wound around a core material 18b in a roll shape. A long paper roll (long recording medium roll) 18a is supported rotatably and detachably. The long paper 18 includes a seal-like paper bonded to a release paper.
On the conveyance path of the long paper 18 drawn from the long paper roll 18a and between the long paper roll 18a and the printing unit 2, a driving roller 16a and a driven roller 16b pressed against the driving roller 16a are provided. A pair of long paper conveyance rollers 16 having the above is disposed. The driving roller 16a is rotationally driven by a stepping motor 19, and the operation of the stepping motor 19 is controlled by the control means Cnt.

Long paper winding means 4 is disposed downstream of the printing unit 2.
A long paper winding means (long recording medium winding means) 4 includes a long paper winding member (long recording medium winding means) 20, a long paper winding motor (long recording medium winding motor) 21, A paper roll take-up roller pair (long recording medium take-up roller pair) 22 and the like are included.
The long paper take-up member 20 is rotatably and detachably supported by the apparatus main body 17, and detachably supports the core material 20a to which one end of the long paper 18 after printing is fixed. A rubber belt 23 is wound around the long paper winding member 20, and the rubber belt 23 is wound on a pulley 21 a attached to a long paper winding motor 21 disposed in the apparatus main body 17.
With this configuration, when the long paper take-up motor 21 operates, the long paper take-up member 20 rotates counterclockwise in FIG. 1 and the long paper 18 is taken up.

The rotational peripheral speed of the long paper winding motor 21 is set slightly faster than the rotational peripheral speed of the long paper winding roller pair 22 described later. A torque limiter (not shown) is interposed between the output shaft of the long paper winding motor 21 and the pulley 21a. The long paper take-up motor 21 winds the long paper 18 around the long paper take-up member 20 without causing the long paper 18 to slip in the long paper take-up roller pair 22, and the long paper is wound while a torque limiter (not shown) slides. The long paper take-up member 20 is wound so that the slack does not occur at 18.
A pair of long paper take-up rollers having a driving roller 22a and a driven roller 22b in pressure contact with the long paper take-up member 20 and the printing unit 2 on the transport path of the long paper 18. 22 is disposed. The drive roller 22a is rotationally driven by a stepping motor 24, and the operation of the stepping motor 24 is controlled by the control means Cnt.

  The printing apparatus 1 according to the present invention having the above-described configuration is provided with the opening portion 5A and the non-opening portion 5B sequentially along the circumferential direction, and the stencil printing master 8 on which the plate-making image is formed is the opening portion. A plate cylinder 5 wound around 5A and supported rotatably and detachably on the apparatus main body 17 and having ink supply means 9, 10 and 11 inside, and in contact with the plate cylinder at a printing position N A presser 6 that can be separated is provided, and at the printing position N, the presser 6 presses the stencil printing master 8 on the hole portion 5A to supply ink from the ink supply unit, so that the stencil printing master The printing unit 2 that prints the plate-making image on the recording medium 18, and the long recording medium feeding unit that sends the recording medium 18 drawn out from the long recording medium 18 a wound in a roll shape toward the printing unit 2 3 and a long recording medium printed by the printing unit The has an elongated recording medium winding unit 4 for winding into a roll, the. Further, the pressing means is brought into contact with the long recording medium 18 during a period in which at least the opening portion front end portion 5AF and the opening portion rear end portion 5AR sequentially pass through the printing position while the plate cylinder 5 rotates once. After the ink supply to the long recording medium is completed, the pressing means is separated, and before the opening end 5AF that has been rotated and moved reaches the printing position, the long recording medium feeding means 3 and the long recording medium The medium winding means 4 is reversed by a predetermined amount to perform the rewinding operation of the long recording medium, and after the rewinding operation is completed, the long recording medium feeding means and the long recording medium winding means are rotated forward again. Thus, the configuration is such that the normal conveyance of the long recording medium is resumed.

FIG. 3 shows a stencil printing apparatus to which a plate cylinder 5 used in the printing apparatus 1 can be attached.
The stencil printing apparatus 29 includes a printing unit 30, a plate making unit 31, a paper feeding unit 32, a plate discharging unit 33, a paper discharging unit 34, an image reading unit (not shown), and the like.
The printing unit 30 located substantially in the center of the apparatus main body 35 includes a plate cylinder 5 and a press roller 36.

The plate cylinder 5 is configured to be detachable from the apparatus main body 35 by slidingly engaging the rails 37 and 38 shown in FIG. 2 with respect to guide rails 47 and 48 disposed in the apparatus main body 35. Yes. The plate cylinder 5 is detachable between the printing apparatus 1 and the apparatus main body 35.
The press roller 36 disposed below the plate cylinder 5 is configured in the same manner as the press roller 6 of the printing apparatus 1 and is swung by a swinging means (not shown) so as to be in contact with and away from the peripheral surface of the plate cylinder 5. It is configured freely.

In the vicinity of the press roller 36, press roller locking means (not shown) that holds the press roller 36 at a spaced position where the press roller 36 is separated from the plate cylinder 5 is disposed.
A plate making section 31 is disposed on the upper right side of the printing section 30. The plate making unit 31 constitutes a master support means (not shown) and a master 8 that rotatably and detachably supports a master roll 8a formed by winding a stencil master 8 (hereinafter simply referred to as a master 8) in a roll shape. A thermal head 49 that performs hot-drilling plate-making on a thermoplastic resin film, a platen roller 50 that conveys the master 8 while being pressed against the thermal head 49, a master cutting means 51 that cuts the master 8, and a master conveyance roller that conveys the master 8 52, a master conveying roller pair 53, and a master stock means (not shown) that stores and stores a deflection of one plate in the master 8 that has been made.
The front end of the master 8 made in the plate making section 31 is brought into a plate feed standby state and is carried to the opened clamper 7, and the front end is held on the outer peripheral surface of the plate cylinder 5 by closing the clamper 7.

Thereafter, when the plate cylinder 5 is rotated and the platen roller 50, the master conveying roller 52, and the master conveying roller pair 53 are rotated, the master 8 made by the plate is sent out from the plate making unit 31, and the master for one plate is conveyed. The master cutting means 51 is activated and the master 8 is cut.
The cut master 8 is pulled out from the plate making section 31 by the rotation of the plate cylinder 5, whereby the winding operation of the master 8 around the plate cylinder 5 is completed.

A sheet feeding unit 32 is disposed below the plate making unit 31. The paper feed unit 32 includes a paper feed tray 54 on which the paper P is stacked, a paper feed roller 55 for feeding the paper P from the paper feed tray 54, a separation roller 56 and a separation pad 57 for separating and feeding the paper P one by one, a separation A registration roller pair 58 for feeding the fed paper P toward the printing unit 30 at a predetermined timing is provided.
The registration roller pair 58 is transmitted with a driving force from a plate cylinder driving unit (not shown) via a driving force transmission unit (not shown), and is driven to rotate in synchronization with the rotation of the plate cylinder 5.
The paper P fed from the paper feed unit 32 is sent to the pressure contact portion between the plate cylinder 5 and the press roller 36 at a timing that coincides with the plate-making image of the master 8 wound on the plate cylinder 5. When the press roller 36 is pressed against the plate cylinder 5, a printed image corresponding to the plate-making image is formed on the upper surface thereof.

A plate discharging unit 33 is disposed on the upper left side of the printing unit 30.
The plate discharging unit 33 peels off and transfers the used master 8 from the outer peripheral surface of the plate cylinder 5, the upper plate discharging member 59 and the lower plate discharging member 60, and the used master 8 conveyed by the respective plate discharging members 59 and 60. There are a plate discharging box 61 for storing, a compression plate (not shown) and the like for compressing the used master 8 in the plate discharging box.
The plate discharging box 61 is detachable from the apparatus main body 35, and is removed from the apparatus main body 35 when the sensor (not shown) detects that the used master 8 in the plate discharging box 61 is full. The used master 8 inside is discarded.
A paper discharge unit 34 is disposed below the plate discharge unit 33. The paper discharge section 34 is sucked and conveyed by a peeling means (not shown) that peels off the printed paper P from the outer peripheral surface of the plate cylinder 5, a paper discharge conveyance member 62 that sucks and conveys the printed paper P, and a paper discharge conveyance member 62. And a paper discharge tray 63 on which the printed paper P is stacked.
The paper discharge tray 63 is provided with an end fence 64 where the leading edge of the paper P abuts and a pair of side fences (not shown) for aligning the paper P in the width direction.

After the plate cylinder 5 (with a used master) removed from the apparatus main body 17 of the printing apparatus 1 is mounted on the apparatus main body 35 of the stencil printing apparatus 29, a document is set on an image reading unit (not shown), and the stencil printing apparatus 29 is illustrated. Press the start key for the plate making. Then, after the plate discharging unit 33 is operated and the used master 8 is peeled off from the plate cylinder 5, the plate making unit 31 is operated and a plate making image corresponding to the original image is formed on the outer peripheral surface of the plate cylinder 5. A new master 8 is wound.
By removing the plate cylinder 5 from the apparatus main body 35 and attaching it to the apparatus main body 17, new printing can be performed in the printing apparatus 1.
FIG. 4 shows a circumferential range and a circumferential positional relationship between the opening portion 5A and the non-opening portion 5B in the plate cylinder 5. In the first embodiment, since the press roller 6 presses the peripheral surface thereof corresponding to the opening 5A of the plate cylinder 5, the opening 5A is an A3 size printing region, and the non-opening 5B is It becomes a non-printing area.

Hereinafter, the operation of the printing apparatus 1 according to the first embodiment will be described with reference to FIGS. 1 to 6.
The operations of the printing apparatus 1 and the stencil printing apparatus 29 are performed by control from a control means (CPU or the like) Cnt (not shown).
First, the operator uses the stencil printing apparatus 29 shown in FIG. 3 to manufacture the master 8 on which the plate-making image to be printed on the peripheral surface of the plate cylinder 5 is manufactured, and then winds the master 8 on the plate cylinder. The cylinder 5 is removed from the stencil printing apparatus 29 and attached to the printing apparatus 1.
In the printing apparatus 1, the leading end of the long paper 18 is pulled out from the long paper roll 18 a, and this leading end passes through the long paper conveying roller pair 16 and the long paper winding roller pair 22 to the long paper winding member 20. Fixed.

The long paper (long recording medium) 18 is set in a state in which tension is maintained between the long paper roll 18 a and the long paper winding member 20, thereby completing the printing preparation.
When the operator presses a start key (not shown) after the preparation for printing is completed, the stepping motors 19 and 24 and the long paper take-up motor 21 are operated to feed the long paper 18 from the long paper roll 18a. At this time, the stepping motors 19 and 24 are operated in complete synchronization with each other, and the conveyance speed by the long paper conveyance roller pair 16 and the conveyance speed by the long paper take-up roller pair 22 are set to be equal. .

A plate cylinder driving means (not shown) is operated in synchronism with the operations of the motors 19, 21, and 24, and the plate cylinder 5 is rotationally driven in the clockwise direction in FIG.
When the tip 5AF of the opening 5A of the plate cylinder 5 reaches a position (printing position) corresponding to the press roller 6, the press roller 6 swings and presses against the plate cylinder 5 (directly long paper). Then, the ink supplied from the ink container 9 to the inner peripheral surface of the plate cylinder 5 oozes out through the opening portion 5A and the perforation portion of the master 8, and is transferred to the long paper 18 and is transferred to the area of the image D1. A printed image corresponding to the perforated part (plate making image) is formed.
When the press roller 6 is separated from the outer peripheral surface of the plate cylinder 5, the operations of the motors 19, 21, and 24 are temporarily stopped, and the feeding of the long paper 18 is stopped. Immediately thereafter, the motors 19, 21, and 24 are reversely rotated by a predetermined distance (DS distance + α). At this time, the long paper portion located between the long paper conveyance roller pair 16 and the long paper take-up roller pair 22 is in a state where a slight deflection can be formed, that is, the length of the long paper portion is “ The motors 19, 21, and 24 are controlled so that “the shortest distance + α between the nip portion of the long paper conveyance roller pair 16 and the nip portion of the long paper take-up roller pair 22”. Specifically, with the long paper transport roller pair 16 stopped, only the long paper take-up roller pair 22 is first rotated backward to form a flexure that does not contact the clamper and the press roller. To do. When a predetermined amount of deflection is formed on the long paper, the long paper conveyance roller pair 16 that has been stopped is driven to rotate at the same rotational peripheral speed as the long paper take-up roller pair 22. Alternatively, the relationship between the rotational peripheral speeds of the long paper conveying roller pair 16 and the long paper winding roller pair 22 is “long paper conveying roller pair 16 <long paper winding roller pair 22”, and a predetermined amount of bending is formed. In this way, the reverse rotation drive is performed.

FIG. 5 is a schematic view showing a state in which the long paper is conveyed in the reverse direction after the formation of the preceding image D1, and FIG. 6 ends the reverse conveyance of the long paper and stops the long paper. Indicates the state.
As shown in FIG. 5, while the motors 19, 21, and 24 are rotating in the reverse direction, in addition to the bending formation by the long paper conveyance roller pair 16 and the long paper take-up roller pair 22, the peeling means ( The bending is surely formed by continuously discharging air from the tip of the bending forming means) 25 toward the long paper, and is controlled so as not to contact both the press roller 6 and the clamper 7.
After the first image D1 is formed on the long paper by the first rotation of the plate cylinder 5, the long paper roll 18a winds the long paper 18 for a predetermined length by reversing the motors 19, 21, and 24. At this point, the motors 19, 21, and 24 are immediately stopped to enter a standby state for the next process for forming the next image D2 (FIG. 6). At this time as well, air is continuously discharged from the tip of the peeling means 25, which is a peeling means, and a slight deflection is formed on the long paper positioned between the plate cylinder and the press roller. Control is performed so as not to contact both of the clampers 7.

As shown in FIG. 5 and FIG. 6, the peeling means 25 is operated during a period from when the motors 19, 21, and 24 start to reversely rotate by a predetermined distance (DS distance + α) until they resume normal rotation. Thus, air is continuously discharged so that the long paper 18 does not come into contact with both the press roller 6 and the clamper 7. For this reason, the long paper 18 is not wrinkled or torn and can be stably conveyed.
The peeling means 25 used for peeling the long paper from the plate cylinder in this way can also be used as a means for forming a bend so that the long paper does not come into contact with the press roller or the clamper during reverse conveyance. It is not necessary to add a new dedicated means for assisting formation, and the cost can be reduced.

The peeling means 25 is preferably operated continuously, but air is intermittently discharged only at the timing when the clamper and the long paper come into contact with each other, as long as the long paper 18 does not come into contact with both the press roller 6 and the clamper 7. It is possible to adjust the discharge air amount.
In this embodiment, as a method of forming a bend in the long paper, a method of individually controlling the reverse rotation driving (reverse speed) of the long paper conveyance roller pair 16 and the long paper take-up roller pair 22 and peeling are used. Both modes of air blowing by means 25 are used. However, only the configuration for controlling the reverse rotation driving of the long paper conveyance roller pair 16 and the long paper winding roller pair 22 may be used.

The plate cylinder driving means (not shown) continues to drive the plate cylinder while the long paper 18 is conveyed in the forward direction and then in the reverse direction and then resumed in the forward direction. Continue to rotate in the direction. In the first rotation, the opening front end 5AF and the rear opening 5AR of the plate cylinder pass through the printing position (position where the press roller 6 contacts the long paper = nip portion) N in succession. After the image D1 is formed on the paper, the long paper is conveyed in the reverse direction by a predetermined distance and stopped (FIGS. 5 and 6). In this state, when the opening portion front end portion 5AF reaches a position a predetermined distance before (upstream side) from the printing position N (state shown in FIG. 6), the motors 19, 21, and 24 are again started to drive in the forward direction. Thus, the feeding of the long paper 18 is resumed. Further, the press roller 6 swings at the timing when the opening portion front end portion 5AF reaches the printing position N and presses against the long recording paper on the plate cylinder 5.
Thereafter, the long paper 18 is conveyed in the forward direction while the plate cylinder 5 is rotated, and after the image D1 printed on the long paper 18 in accordance with the timing at which the opening portion front end 5AF reaches the printing position N. The end reaches a position corresponding to the tip of the opening. Further, when the long paper 18 is conveyed, a print image is formed in the area of the long paper image D2.

In this embodiment, every time image formation is performed once by rotating the plate cylinder 5 in this way, the previously formed image D1 is upstream of the nip position (printing position) N of the press roller. Thus, the long paper is reversely conveyed by a predetermined distance (DS distance + α). By adjusting the predetermined distance, the long paper 18 can be used economically without (or narrowing) the interval DS between the preceding image D1 and the subsequent image D2. The long paper 18 that has been printed is cut and used as necessary after printing.
According to the first embodiment, stencil printing on the long paper 18 can be easily performed without causing wrinkles or tears. That is, in sticker printing or label printing using the long paper 18, printing that eliminates the discarding part (DS part) in the middle can be easily performed at a low cost at any time.
Further, since the long paper 18 is used, it is possible to prevent the occurrence of a paper transport jam as compared with printing using a sheet.

Next, the configuration, operational differences, and advantages of the printing apparatus of the present invention will be described by comparison with the conventional example described in Patent Document 2.
First, the printing operation of the printing apparatus of Patent Document 2 (relationship between the plate cylinder opening and the printing portion of the long paper) will be described with reference to FIG. In this example, an A3 size image is printed on a long sheet, and the circumferential length of the plate cylinder opening 5A corresponds to the A3 size.

As shown in FIG. 7A, when the rear end 5AR of the opening portion 5A of the plate cylinder reaches the printing position (nip portion, printing pressure portion) N, the long paper 18 is conveyed in the positive direction. It stops, and the press roller 6 as the pressing means is separated from the pressing position to the standby position. At this time, the rear end portion of the image D1 on the long paper stops at the printing position N. The plate cylinder 5 continues to rotate while maintaining the set speed.
FIG. 7B shows a state where the separation of the press roller 6 as the pressing means from the pressing position to the standby position is completed while the conveyance of the long paper 18 is stopped. At this time, the rear end portion of the image D1 on the long paper is stopped at the printing position N as it is.
FIG. 7C shows that the driving of each motor is resumed in the forward direction of the long paper before a predetermined time (before a predetermined distance) when the front end portion 5AF of the opening portion of the plate cylinder reaches the printing position N. The state immediately before resumption of feeding is shown. At this time, the press roller 6 as the pressing means is in a state of being moved to the printing position N (pressure contact state), but the contact force is weak and sufficient pressing force for printing is not generated.
FIG. 7D shows a state in which printing has started, and conveyance of long paper has started. The front end portion 5AF of the opening portion reaches the printing position N, and printing of the next image D2 is started by pressing with the press roller.
The DS section shown in this figure is the transport amount of the long paper from FIG. 7C to FIG. 7D, and neither the preceding image D1 nor the next image D2 is formed in this DS section. So it becomes a wasteful part that is cut and discarded.
As described above, in Patent Document 2, a useless portion DS between images is generated, which is uneconomical.

Next, the configuration and operation of the first embodiment of the present invention will be described with reference to FIG.
The embodiment of FIG. 8 relates to the case where an A3 size image is printed on a long sheet similarly to FIG. 7, and the circumferential length of the plate cylinder opening 5A is A3 size.
FIGS. 8A to 8D show the printing apparatus 1 according to the present invention after the printing of the previous image D0 has been completed and the printing of the next image D1 has been disclosed, and the printing of the next image D1 has been completed. The procedure until the printing of the subsequent image D2 is started is shown.
FIG. 8A shows a state at the time when printing of the image D1 is started. At this time, the front end portion 5AF of the aperture is at the printing position N. At this time, the air is discharged from the peeling unit 25 toward the long paper, and control is performed so as to prevent the leading edge of the image from winding up (winding around the plate cylinder).

When the plate cylinder 5 further rotates clockwise than in the state shown in FIG. 8A, printing of the image D1 is started continuously from the rear end portion of the image D0. When printing of the image D1 is completed, the rear end 5AR of the aperture is at the printing position N. From this point on, the conveying speed of the long paper is gradually reduced, and the pressing force of the press roller 6 is maximum. The movement starts gradually from the contact position to the separation position where the pressing force is released. The plate cylinder 5 continues to rotate at the set speed as it is.
FIG. 8B shows a state in which after the printing of the image D1 is finished, the operation of stopping the long paper at a predetermined position on the downstream side and separating the press roller from the pressing position to the standby position is completed. The plate cylinder 5 continues to rotate at a predetermined speed. The trailing edge of the image D1 on the long paper temporarily stops downstream in the transport direction from the printing position N, but immediately rotates the pair of long paper transport rollers 16 (or / and the long paper roll 18a) in reverse. Then, the rear end portion of the image D1 is transported a predetermined distance beyond the printing position N to the upstream side in the transport direction and stopped. Each motor is stopped after the long paper is reversely conveyed by a predetermined distance. In the drawing, D1R indicated by a broken lead line is a stop position of the image D1.

Simultaneously with the start of reverse conveyance, air is continuously discharged from the peeling means 25. In this way, the long paper between the long paper transport roller pair 16 and the long paper take-up roller pair 22 is fed back while slightly bending by the air from the peeling means. By controlling the conveyance in this way, since the long paper does not come in contact with either the clamper or the press roller, it is possible to prevent the long paper from being broken or wrinkled.
When the long paper is reversely conveyed, the deflection may be formed by controlling the rotation of the long paper roll 18a and the conveying roller pair 16.

FIG. 8C shows that when the front end 5AF of the opening of the plate cylinder is a predetermined distance (predetermined circumferential distance) from the printing position N, each motor related to the conveyance of the long paper is re-driven. The state in which the conveyance of the long paper in the forward direction is resumed (the state immediately before resumption) is shown. Control is performed so that the transport speed of the long paper and the rotation speed of the plate cylinder are synchronized when the leading end of the region on the long paper where the image D2 is formed reaches the printing position N. By controlling in this way, ink pre-leakage can be prevented. The press roller 6 is in a state of being in pressure contact with the printing position at the timing when the leading end of the area where the image D2 is formed on the long paper reaches the printing position N.
The long paper whose amount of movement upstream of the position of the rear end portion D1R of the image D1 on the long paper shown in FIGS. 8B to 8C, that is, the reverse feed amount L1, is a feature of the present application. Is a return amount (return distance) by reversely sending. By variously adjusting the reverse feed amount L1 according to the conditions, the “DS” portion can be set to “0” and the discard amount of the long paper can be made zero.

FIG. 8D shows a state in which printing of the next image D2 has started. Printing is performed by applying pressure suitable for printing from the press roller 6 at the timing when the front end 5AF of the opening 5A of the plate cylinder reaches the printing position N. At this time, the transport speed of the long paper has reached the same speed as the rotational speed of the plate cylinder, and no stress is given to the master 8 wound around the plate cylinder. At this time, the printing start timing is controlled so that the rear end portion D1R of the image D1 printed earlier is at the printing position N and coincides with the opening portion front end 5AF of the plate cylinder.
As described above, in the present embodiment, the conveyance of the long paper is controlled by rotating forward / reversely so that the leading edge D2F of the next image D2 is continuous with the trailing edge D1R of the previously printed image D1. Therefore, there is no useless part discarded when cutting and using each image, which is economical.

Furthermore, by using air discharge from the peeling means 25, which is usually used to prevent the recording medium portion corresponding to the leading edge of the image from being rolled up, when the long paper is reversed, the long paper is applied to the clamper and the press roller. Contact can be prevented, and there is no problem that the long paper is wrinkled or torn.
Note that, for example, by controlling the back feed amount L1 of the long paper in FIG. 8C to be small, it is possible to intentionally create a margin between images, and meet various needs of users. Can do.

Next, there are two methods in which a press roller is pressed against a plate cylinder opening portion in a stencil printing apparatus that is currently commercially available.
One press contact method is a method in which a cam is provided on the outside of the drum-shaped plate cylinder 5 and press-contacted by a cam follower in the press roller 6. In this system, the press roller is brought into pressure contact with the plate cylinder at one timing. That is, pressure contact is made according to the length of the plate cylinder opening. For example, if the circumferential length of the aperture is equivalent to A3 size, pressure is applied to the entire range. Moreover, the range to apply for every plate cylinder (plate cylinder opening part) can be changed.
The other press contact method is to provide a cam on the device body side. Usually, two types of cams (for example, for A3 size and A4 size) are installed and the cam is slid to change the press roller press contact range. To do. This method has a drawback that a drive mechanism and a detection mechanism for sliding / fixing the cam are required, the number of parts is increased, and it is complicated and expensive.
In the present invention, the former (the press contact range is determined by the circumferential length of the opening portion of the plate cylinder), which is the simplest and cheapest mechanism, is used.

Next, when the circumferential size of the plate cylinder opening 5A corresponds to the plate making image length of A3 size (420 mm), an image of A4 size (210 mm) shorter than A3 size using this plate cylinder 5 is used. The present invention will be described with respect to the case of printing on long paper while comparing with the conventional example.
The plate making image area storage means 45 (FIG. 2), which is installed on the frame 44 side and stores the plate making image length in the long paper conveyance direction, has been pre-rolled around the outer peripheral surface of the plate cylinder 5. The position of the prepress image on the master 8 and the image size are stored. On the other hand, the image information reading means 46 installed on the apparatus main body 17 side reads the information of the plate-making image length and its position in the long-sheet conveyance direction of the plate-making master 8 actually wound on the plate cylinder.

In this example, the length in the circumferential direction of the plate-making image on the plate-making master 8 is A4 size, and is located in the circumferential direction range of 210 mm from the opening portion front end 5AF on the plate cylinder outer circumferential surface. Therefore, although the plate-making master 8 is wound around the latter half portion of the opening portion located behind the rear end portion of the plate-making image, there is no plate-making image. On the other hand, the press roller 6 is in pressure contact over the entire circumferential length of the opening 5A having a circumferential length corresponding to the A3 size.
During the period in which the press roller 6 is in pressure contact with the plate-making master 8 on the peripheral surface of the plate cylinder, the long paper is conveyed so as not to be wrinkled or torn due to stress on the master. Further, as described with reference to FIG. 12, in order to prevent ink front leakage and back leakage, a predetermined range forward from the front end of the plate cylinder opening and from the rear end of the plate cylinder opening. It is preferable to press the press roller backward against a predetermined range.
A case where an A4 size plate-making image is printed on a long sheet by a conventional printing apparatus having the above-described plate cylinder, master-making master, and press roller will be described with reference to FIG.

In FIG. 9A, the conveyance of the long paper is stopped, and the rear end 5AR of the opening 5A has reached the printing position N. When the rear end 5AR reaches the printing position N, the motors are stopped to stop the conveyance of the long paper in the forward direction, and the standby position where the press roller 6 is separated from the pressing position in contact with the pre-printed master. Evacuate to. The rear end portion D1R of the A4-sized image D1 on the long paper that has been printed in advance is located downstream of the rear end portion 5AR of the opening portion 5A at the printing position N. The plate cylinder continues to rotate while maintaining the set printing speed.
FIG. 9B shows a state where the operation of separating the press roller 6 from the pressing position to the standby position is completed. The long paper is still stopped from being conveyed.
Further, at the time when the plate cylinder rotates and reaches the rotation angle of FIG. 9C, the hole front end portion 5AF is in a position before the printing position N, and the normal rotation of each motor is resumed after this time, Long paper feed is resumed. In this state, the press roller 6 is moved to the printing position (pressing position), but the pressing force is insufficient for printing.

When the plate cylinder 5 further rotates and reaches the rotation angle shown in FIG. 9D, printing of the next A4 size image D2 is started. The front end 5AF of the opening portion of the plate cylinder reaches the printing position N, and the pressing force by the press roller 6 is increased to the set pressure. On the other hand, the long paper reaches the same speed as the rotational speed of the plate cylinder at this time, and is transported, so that the master 8 is not stressed.
The DS2 portion shown in this figure was conveyed between the length from the rear end of the A4 size plate-making image on the master 8 to the rear end portion 5AR of the aperture and from FIG. 9 (c) to FIG. 9 (d). This corresponds to the sum of the transport amount (transport length) of the long paper, and is neither the A4 size image D1 nor the next A4 image D2, and is a portion that is cut and discarded.
When an image having a circumferential size smaller than the size of the aperture is made in this way, the shorter the image length, the longer the DS2 portion, which is uneconomical.

Next, a printing procedure by the printing apparatus 1 according to the present invention and advantages associated therewith will be described with reference to FIG.
In the present embodiment, similarly to FIG. 9, when the circumferential length of the plate cylinder opening 5A and the pressure contact range with the normal pressure of the press roller 6 are A3 size, the A4 size plate-making image is used to make the long paper. It relates to the case where printing is performed.
FIG. 10A shows a state at the time when printing of the A4 size image D1 is started, and the front end portion 5AF of the opening portion 5A is at the printing position (printing pressure portion) N. At this time, the air is discharged from the peeling means 25 and is controlled so as to prevent the leading edge of the image from rolling up. The long paper is conveyed, and the plate cylinder is also rotationally driven.

Further, when the rotation of the plate cylinder 5 proceeds and the rear end portion 5AR of the opening reaches the printing position N, each motor is controlled to gradually decrease the conveying speed of the long paper, and the press roller 6 The movement starts gradually from the contact position where the pressing force is maximum to the release position. The plate cylinder continues to rotate while maintaining the set printing speed. The rear end portion D1R of the image D1 on the long paper is located downstream of the rear end portion 5AR of the opening portion 5A at the printing position N (position in FIG. 10B).
FIG. 10B shows a state in which the plate cylinder continues to rotate so that the rear end portion 5AR of the opening portion passes the printing position N and the conveyance of the long paper is stopped. At this time, the press roller 6 has finished moving from the pressing position to the standby position.

The rear end portion D1R of the A4 size image D1 on the long paper stops from the printing position N on the downstream side in the transport direction. Immediately after the conveyance of the long paper is stopped, the conveyance roller pair 16 (or the long paper roll 18a) is reversely driven to reversely convey the rear end portion D1R of the image D1 on the long paper to the upstream side in the conveyance direction. It stops when the end D1R exceeds the printing position N by a predetermined distance upstream (state shown in FIG. 10C). In parallel with the reverse feeding operation, air is continuously discharged from the peeling means 25. As described above, the long paper between the long paper transport roller pair 16 and the long paper take-up roller pair 22 is fed back while forming a slight deflection by the air from the peeling means 25. By controlling in this way, since the long paper does not come into contact with either the clamper or the press roller, the long paper can be prevented from being broken or wrinkled.
At this time, the rotational speed of each of the reversely fed long papers may be controlled so as to bend between the long paper roll 18a and the conveying roller pair 16.

FIG. 10C shows a state immediately before the opening portion front end portion 5AF of the plate cylinder reaches the printing position N, and when the opening portion front end portion 5AF reaches the position shown in the drawing, The motors are restarted in the forward direction, and the conveyance of the long paper is resumed. The press roller 6 is moved to the pressing position. At this time, the conveyance speed of the long paper is synchronized with the rotation speed of the plate cylinder. Further, when the leading end 5AF of the opening 5A of the plate cylinder reaches a predetermined distance before the printing position N, the conveyance of the long paper is resumed to prevent the ink from leaking.
The movement amount L2 of the position of the rear end portion D1R of the A4 size image D1 on the long paper in FIGS. 10B to 10C is the amount of reverse feed of the long paper (reverse feed amount). By adjusting the reverse feed amount L2 according to various conditions, the “DS” portion discarded in the conventional printing apparatus can be set to “0”.
FIG. 10D shows a state where printing of the next A4 size image D2 is started by resuming the conveyance of the long sheet from the state of FIG. The front end portion 5AF of the opening 5A of the plate cylinder has reached the printing position N, and the rear end portion D1R of the image D1 previously printed with long paper is at the printing position N. The pressing by the press roller 6 is performed at a sufficient pressure suitable for printing. At this time, the transport speed of the long paper reaches the same speed as the rotation speed of the plate cylinder and is transported, and no stress is applied to the master wound around the plate cylinder.

As described above, even when the length of the image formed on the long paper is sufficiently shorter than the circumferential length of the plate cylinder opening portion, the conveyance of the long paper is controlled by normal / reverse rotation. . As a result, the leading edge of the next image D2 can be positioned at the trailing edge of the previously printed image D1, so that when the image is cut and used, it is discarded and wasted. Is no longer economical.
Further, by utilizing the air discharge from the peeling means 25 used for preventing the leading edge of the image from being reversed when the long paper is reversed, it is possible to prevent the long paper from coming into contact with the clamper 7 and the press roller 6. Therefore, there is no problem that the long paper is wrinkled or torn.

Further, for example, by controlling the back feed amount L2 of the long paper in FIG. 10C to be short, it is possible to intentionally create a margin, and respond to various needs of users. be able to.
Further, when the above-described control for normal / reverse rotation of the long paper is performed when the length of the image formed on the long paper is sufficiently shorter than the circumferential length of the plate cylinder opening, the printing speed Depending on the situation, it is assumed that the rewinding of the long paper is delayed and the printing is not started in time. In this case, the user may reduce the printing speed or may automatically change to the optimum printing speed by the control unit of the printing apparatus main body.

  Further, the operation may be changed to so-called skip printing by the operation by the operator or the control from the control unit of the printing apparatus main body so as to optimally secure the stoppage time / reverse time of the long paper. That is, when the rewinding time of the long recording medium is not in time for the printing speed due to the small image size, the plate cylinder is rotated at least two times with the press roller 6 kept away from the plate cylinder 5. After a number of rotations, a printing operation called “skip paper feeding” is performed in which the press roller is pressed to print the next print image, and air is jetted onto the long paper according to the rotation of the plate cylinder. The operation timing of the deflection forming means 25 is controlled.

<Summary of Configuration, Action, and Effect of Printing Apparatus 1 of the Present Invention>
The first aspect of the present invention includes an opening portion 5A and a non-opening portion 5B in order along the circumferential direction, wound around a master for stencil printing 8, and is supported rotatably and detachably on the apparatus body. A plate cylinder 5 having ink supply means therein, and a pressing means 6 that can be brought into contact with and separated from the plate cylinder at the printing position N, and the ink supply means by pressing the master for stencil printing by the pressing means. The printing unit 2 that supplies ink from the stencil printing master and prints the plate-making image on the recording medium on the recording medium, and the long recording medium 18 drawn out from the long recording medium 18a wound in a roll shape. A printing apparatus having a long recording medium feeding means 3 for feeding out toward a printing medium and a long recording medium winding means 4 for winding the printed long recording medium in a roll shape. Touching the pressing means against the long recording medium during rotation After the ink has been supplied to the long recording medium, the pressing means is separated, and then, before the leading end of the aperture that has been rotated and moved reaches the printing position, the long recording medium feeding means and the long recording medium The long recording medium rewinding means is reversed by a predetermined amount to perform the rewinding operation of the long recording medium. After the rewinding operation is completed, the long recording medium feeding means and the long recording medium rewinding means are adjusted again. Rotate to resume normal conveyance of the long recording medium.

  According to this, since printing on long paper can be easily performed by stencil printing, seal printing and label printing using long paper can be performed at low cost. Further, not only intermittently transporting long paper, but also reverse feeding in order to match the print image, it is possible to eliminate useless non-image portions between the print images that have been generated so far. For this reason, it is possible to cut what is printed on long paper into the same size as that of the sheet, and it is possible to obtain the same printed matter as when printed on the sheet, thereby reducing costs. . In addition, since long paper is used, it is possible to prevent the occurrence of paper transport jams as compared with printing using sheet paper, and productivity can be increased.

The second invention has a bending forming means for forming a bending in the long recording medium at the printing position N and separating it from the plate cylinder 5 during the rewinding operation of the long recording medium 18.
Since the bending forming means is used, it is possible to prevent contact between the long paper and the clamper or press roller on the plate cylinder when rewinding the long paper, and there is no occurrence of breakage of the recording medium or wrinkles. .

According to a third aspect of the present invention, the bend forming means drives and controls the long recording medium feeding means and the long recording medium winding means to form a bend in the long recording medium.
As an example of the bending forming means, there can be mentioned means for forming the bending by individually controlling the rotation speed and timing of the long recording medium feeding means and the long recording medium winding means.

According to a fourth aspect of the present invention, there is provided a peeling unit that discharges a gas to a long recording medium that has passed through the printing position N and peels it from the plate cylinder, and the peeling unit is also used as a bending forming unit.
As another example of the deflection forming means, a means for projecting air toward the printing position or the downstream side thereof can be cited. The air discharge means can also serve as a peeling means for preventing the long recording medium immediately after printing from being wound around the plate cylinder.

The fifth invention performs a printing operation in which the pressing means is brought into contact with the leading end portion of the next image after the plate cylinder is rotated forward twice or more while the pressing means is separated from the plate cylinder, and the plate cylinder is rotated. The deflection forming means is controlled according to the above.
When the rewinding time of the long recording medium is not in time for the printing speed because the image size is small, the next printing image is printed after the plate cylinder is rotated twice or more with the press roller 6 retracted. In other words, so-called “skip paper feeding” is performed in which the press roller is pressed to print the image, and the operation timing of the deflection forming means 25 for injecting air onto the long paper according to the rotation of the plate cylinder is controlled.

According to a sixth aspect of the invention, the speed at which the long recording medium feeding means and the long recording medium winding means are reversed to rewind the long recording medium is changed according to the rotational speed of the plate cylinder.
According to this, it is possible to ensure the optimum amount of rewinding and deflection formation according to the rotational speed of the plate cylinder.

According to a seventh aspect of the present invention, the plate cylinder is detachable with respect to the stencil printing apparatus which has at least a plate making section and a plate discharging section and winds a new plate-making master produced by the plate making section around the plate cylinder. Yes, a stencil printing master made by a stencil printing apparatus is wound around a plate cylinder and used.
After the plate cylinder 5 (with a used master) removed from the printing apparatus 1 is mounted on the stencil printing apparatus 29, a document is set on the image reading unit, and the stencil printing apparatus 29 is started. Then, after the plate discharging unit 33 is operated and the used master 8 is peeled off from the plate cylinder 5, the plate making unit 31 is operated and a plate making image corresponding to the original image is formed on the outer peripheral surface of the plate cylinder 5. A new master 8 is wound. By removing the plate cylinder 5 from the apparatus main body 35 and mounting it on the printing apparatus 1, new printing can be performed in the printing apparatus 1.

DESCRIPTION OF SYMBOLS 1 ... Printing apparatus, 2 ... Printing part, 3 ... Long recording medium paper feeding means (long paper feeding means), 5 ... Plate cylinder, 5A ... Plate cylinder opening part, 5AF ... Opening part front-end | tip part, 5AR ... rear end part of opening part, 5B ... non-opening part, 6 ... press roller (pressing means), 7 ... clamper, 8 ... master, 8 ... master for stencil printing, 8a ... master roll, 9 ... ink supply means, DESCRIPTION OF SYMBOLS 10 ... Ink roller, 11 ... Doctor roller, 13, 14 ... Guide rail, 15 ... Long paper support means, 16 ... Long paper conveyance roller pair, 16a ... Drive roller, 16b ... Drive roller, 17 ... Apparatus main body, 18 ... Recording medium (long recording medium), 18a ... long paper roll, 18b ... core material, 19, 21, 24 ... motor, 21a ... pulley, 22 ... roller pair, 22a ... driving roller, 22b ... driven roller, 23 ... rubber belt, 24 ... stepping motor, 25 ... type Means, 25 ... peeling means, 29 ... stencil printing device, 30 ... printing section, 31 ... plate making section, 32 ... paper feeding section, 33 ... discharge plate section, 34 ... paper discharge section, 35 ... apparatus main body, 36 ... press roller, 37, 38 ... rail, 39 ... driving force transmitting disk, 40 ... driving disk, 40a ... pin, 41 ... rear side plate, 42 ... timing belt, 43 ... timing pulley, 44 ... frame, 45 ... prepress image area storage means , 46: Image information reading means, 47, 48: Guide rail, 49 ... Thermal head, 50 ... Platen roller, Cnt ... Control means, 51 ... Master cutting means, 52 ... Master transport roller, 53 ... Master transport roller pair, 54 ... Paper feed tray, 55 ... Feeding roller, 56 ... Separation roller, 57 ... Separation pad, 58 ... Registration roller pair, 59, 60 ... Discard plate member, 61 ... Discard plate box, 62 ... Discharge transport section , 63 ... the paper discharge tray, 64 ... end fence

Japanese Patent Laid-Open No. 5-138871 JP 2007-210172 A

Claims (7)

A perforated portion and a non-perforated portion are sequentially provided along the circumferential direction, and a master for stencil printing on which a plate-making image is formed is wound around the perforated portion, and is supported rotatably and detachably on the apparatus body. And a plate cylinder having ink supply means therein, and a pressing means that can be brought into contact with and separated from the plate cylinder at a printing position, and the opening is formed through the recording medium by the pressing means at the printing position. A printing unit for supplying ink from the ink supply means by pressing the stencil printing master on the printing unit and printing a plate-making image on the stencil printing master on the recording medium; A long recording medium feeding unit for feeding the long recording medium drawn out from the long recording medium toward the printing unit, and a long recording for winding the long recording medium printed by the printing unit in a roll shape Medium winding means A printing apparatus,
The pressing means is brought into contact with the long recording medium during a period in which at least the front end of the aperture and the rear end of the aperture pass sequentially through the printing position during one rotation of the plate cylinder. After the ink has been supplied to the long recording medium, the pressing means is separated, and the long recording medium is fed before the leading end of the aperture that has been rotated and moved reaches the printing position. And the long recording medium take-up means are reversed by a predetermined amount to perform the rewinding operation of the long recording medium, and after the rewinding operation is completed, the long recording medium feeding means and the long recording medium are again A printing apparatus, wherein the recording medium winding means is rotated forward to resume normal conveyance of the long recording medium.   2. The printing apparatus according to claim 1, further comprising a deflection forming unit configured to form a deflection in the long recording medium at the printing position and separate the long recording medium from the plate cylinder during the rewinding operation of the long recording medium. .   The printing apparatus according to claim 2, wherein the bending forming unit drives and controls the long recording medium feeding unit and the long recording medium winding unit to form a bending in the long recording medium. .   4. The apparatus according to claim 3, further comprising a peeling unit configured to discharge gas from the plate cylinder by discharging gas to the long recording medium that has passed through the printing position, and the peeling unit is also used as the deflection forming unit. Printing device.   A printing operation is performed in which the pressing means is brought into contact with the leading edge of the next image after the plate cylinder is rotated forward by at least two rotations while the pressing means is separated from the plate cylinder, and the plate cylinder is rotated. The printing apparatus according to claim 1, wherein the deflection forming unit is controlled accordingly.   6. The rotation speed of the plate cylinder is defined as a speed at which the long recording medium feeding unit and the long recording medium winding unit are reversed to rewind the long recording medium. The printing apparatus as described in any one of.   With respect to a stencil printing apparatus having at least a plate making part and a discharging part and winding a new master made by the plate making part around the plate cylinder, the plate cylinder is detachable, The printing apparatus according to claim 1, wherein the master for stencil printing made by a stencil printing apparatus is wound around the plate cylinder.

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