JP2004262137A - Platemaking apparatus/stencil printing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a platemaking apparatus which prevents an increase in cost and can suppress poor carrying even in the case of a curled master, and a stencil printing apparatus which has the platemaking apparatus. <P>SOLUTION: The master 24 made by a platemaking and carrying means 26 is carried by a front tension roller pair 40, and butts against a stopper 8b of a clamper 8 of a plate cylinder 5 via a guide member 57. A master accumulation 24e is formed above an opening of a master stock means 19 by excessive feeding. In an entry into the guide member 57, a leading end of the master 24 is guided by the clockwise rotation of a carrying guide roller 60 having surface properties with a low coefficient of friction, and properly guided into the guide member 57 even if it is curled. The guide roller 60, the platen roller 16 and the roller pair 40 are rotatively driven by the same driving source. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a plate making apparatus for making a master (stencil) based on image information, and a stencil printing apparatus having the plate making apparatus.
[0002]
[Prior art]
In this type of stencil printing apparatus, the leading end of a master made by a plate making apparatus is held by a clamper provided on an outer surface of a plate cylinder, and the master is wound while rotating the plate cylinder.
Positioning during clamping (clamp registration) is a method in which the tip of the master reaches the clamping position by nipping and transporting the master for a certain period of time using a pair of transport rollers provided near the plate feeding standby position of the plate cylinder. Is adopted. For this reason, an electromagnetic clutch or a stepping motor is required for driving the transport roller pair, which has increased the cost.
There is also a method in which the master is conveyed by a front tension roller pair on the downstream side of the platen roller for a certain period of time without providing a conveying roller pair, so that the leading end of the master reaches the clamp position. In this system, in the configuration having the master stock means, a stopper for abutting the tip of the master on the clamper portion of the plate cylinder is formed, and a master pool is formed above the opening of the master stock means by excessive feeding. .
[0003]
Regardless of the presence or absence of the master stock means, in the method of conveying by the front tension roller pair, a guide member for guiding the master to the clamp position is provided because the conveying process is long.
As shown in FIG. 6, the master 24 is conveyed by the platen roller 26 while making a plate by the thermal head 17, and is conveyed while being tensioned by the front tension roller pair 40. The guide member is composed of a lower guide plate 55 and an upper guide plate 56, and the master is guided between the guide plates and reaches the clamping position of the plate cylinder 5 by the clamper 8.
[0004]
[Patent Document 1]
Japanese Patent Application Laid-Open No. Hei 6-32020
[Problems to be solved by the invention]
However, in the case of a stiff and easily curled master, there is a problem that a conveyance failure occurs at the guide member entrance indicated by a dashed-dotted circle in FIG.
As shown in FIG. 7, the curled tip portion 24c of the master 24 may hit the edge of the upper guide plate 56, and may be displaced upward and come off the entrance of the guide member. Further, as shown in FIG. 8, when the curl is small, the curl may be rounded at the guide member entrance and may not proceed any further.
[0006]
Therefore, an object of the present invention is to provide a plate making apparatus capable of suppressing a conveyance failure even with a curled master without increasing the cost, and a stencil printing apparatus having the plate making apparatus.
[0007]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, there is provided a master making and conveying means for making and conveying a master based on image information, and the master made and conveyed by the master making and conveying means is held in a non-nipped state. In a plate making apparatus in which a predetermined amount is conveyed while being guided by a guide member having a configuration, and the leading end thereof reaches a clamper of a plate cylinder, the master is provided upstream of the guide member in the master conveyance direction, and is rotated so as to push the master downward. And a transport guide roller for guiding the leading end of the master to the guide member.
[0008]
According to a second aspect of the present invention, in the plate making apparatus of the first aspect, the transport guide roller is rotatably driven by the same drive source as the plate transport means.
[0009]
According to a third aspect of the present invention, in the plate making apparatus according to the first or second aspect, the transport guide roller has a surface property having a small friction coefficient.
[0010]
According to a fourth aspect of the present invention, in the plate making apparatus of the first or second aspect, the transport guide roller has a configuration having a small contact area with the master.
[0011]
According to a fifth aspect of the present invention, in the plate making apparatus of the fourth aspect, the transport guide roller has a configuration in which a plurality of annular grooves are provided at intervals in an axial direction.
[0012]
According to a sixth aspect of the present invention, in the plate making apparatus according to any one of the first to fifth aspects, a master stock unit that sucks and stores a master conveyed by the plate making and conveying unit by the air suction source. Is adopted.
[0013]
According to a seventh aspect of the present invention, there is provided a stencil printing apparatus for performing printing by winding a master made by a plate making apparatus around an outer peripheral surface of a plate cylinder, wherein the plate making apparatus is any one of the first to sixth aspects. The plate making device described in the above is adopted.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a schematic front view of a main part of a stencil printing apparatus according to the present embodiment. In FIG. 1, the stencil printing apparatus 1 includes a printing unit 2, a stencil making device 3, and a paper feeding device 4.
The printing unit 2 is located substantially at the center of the apparatus main body (not shown), and is in contact with a plate cylinder 5 that is rotationally driven clockwise in FIG. A press roller 6 is provided so as to be detachable and presses the sheet P fed from the sheet feeding device 4 against the plate cylinder 5.
The plate cylinder 5 includes a porous support plate 5a having both side edges attached to respective peripheral surfaces of a pair of flanges (not shown), and a mesh screen (not shown) wound around the porous support plate 5a by a plurality of layers. The porous support plate 5a has an opening having a plurality of openings 5b.
[0015]
The non-opening portion of the porous support plate 5a is provided with a stage portion 7 which forms a plane along one generatrix of the plate cylinder 5, and a clamper supported on the stage portion 7 by a support shaft 8a so as to be openable and closable. 8 are provided.
The clamper 8 is opened / closed by opening / closing means (not shown) when the plate cylinder 5 occupies a predetermined position.
Inside the plate cylinder 5, an ink supply means 9 is provided. The ink supply means 9 includes an ink supply pipe 10 also serving as a support shaft of the plate cylinder 5, an ink roller 11, a doctor roller 12, and the like.
[0016]
The ink supply pipe 10 is disposed between a pair of flanges (not shown), and rotatably supports each flange via a bearing (not shown). An ink pump and an ink pack (not shown) are connected to the ink supply pipe 10, and the ink in the ink pack is supplied from a plurality of ink supply holes 10 a provided in the ink supply pipe 10 to the inside of the plate cylinder 5 by operating the ink pump. Supplied to
The roller 11 is disposed between a pair of flanges (not shown) and is rotatably supported between a pair of side plates (not shown) fixed to the ink supply pipe 10, respectively. It is synchronously rotated in the same direction.
The ink roller 11 is disposed at a position where a slight gap is formed between the peripheral surface and the inner peripheral surface of the plate cylinder 5.
[0017]
A doctor roller 12 is provided near the ink roller 11. Similarly to the ink roller 11, the doctor roller 12 is rotatably supported between side plates (not shown), and is rotated in the opposite direction by the rotation driving means (not shown) in synchronization with the ink roller 11. The doctor roller 12 is arranged at a position where a slight gap is formed between the peripheral surface of the doctor roller 12 and the peripheral surface of the ink roller 11.
A space having a wedge-shaped cross section is formed in the vicinity of the ink roller 11 and the doctor roller 12, and an ink pool 13 is formed by storing the ink supplied from the ink supply hole 10a in this space. The ink in the ink reservoir 13 was supplied in a thin layer on the peripheral surface of the ink roller 11 when passing through the vicinity of the ink roller 11 and the doctor roller 12, and the plate cylinder 5 was pressed by the press roller 6. At this time, the peripheral surface of the ink roller 11 and the inner peripheral surface of the plate cylinder 5 come into contact with each other and are supplied to the inner peripheral surface of the plate cylinder 5.
[0018]
A press roller 6 is arranged below the plate cylinder 5. A press roller 6 having substantially the same length as the plate cylinder 5 in the axial direction and formed by winding an elastic body such as rubber around a core 6a has a pair of press roller arms 14 at both ends of the core 6a. Are rotatably supported between one ends thereof. The other end of each of the pair of press roller arms 14, which are plate-shaped members, is fixed to a press roller shaft 15 rotatably supported by an apparatus body (not shown). Rocked. Due to this swing, the press roller 6 separates the peripheral surface from the outer surface of the plate cylinder 5 as shown in FIG. 1 and the pressing position at which the peripheral surface contacts the outer peripheral surface of the plate cylinder 5 with a predetermined pressing force. And selectively occupy.
[0019]
A plate making device 3 is provided at the upper right of the printing unit 2. The plate making device 3 includes a master storage member (not shown), a platen roller 16, a thermal head 17, a pair of front tension rollers 40, a cutting unit (cutting unit) 18, a master transport guide 23, a master stock unit 19, a transport guide roller 60, a movable master It has a guide plate 21, a guide member 57 and the like.
A master storage member (not shown) is provided on each of a pair of side plates (not shown) of the plate making device 3, and rotatably and detachably supports a core portion 24b of a master roll 24a in which the master 24 is wound in a roll shape. .
[0020]
The master 24 in the present embodiment has a three-layer structure in which a porous resin film made of a resin is provided on one surface of a thermoplastic resin film, and a porous fiber film made of a fibrous substance is further laminated on the surface. (See JP-A-10-147075). This master has a characteristic that the ink can be transferred uniformly (high image quality) and the ink consumption can be reduced even though the stiffness is low and the strength is low. Note that the use of the master is not limited.
A platen roller 16 is disposed on the left side of the position where the master roll 24a is disposed. The platen roller 16 has an axial length substantially equal to the width of the master 24, and is rotatably supported between side plates (not shown) of the apparatus main body.
The platen roller 16 receives a driving force from a stepping motor (not shown) provided in the apparatus main body, and is driven to rotate clockwise in FIG.
[0021]
A thermal head 17 is provided below the platen roller 16. The thermal head 17 is formed to have a width larger than a length in the width direction of the platen roller 16, and a plurality of heating elements are disposed on an upper surface of the thermal head 17 so that the heating element is pressed against a peripheral surface of the platen roller 16. Are biased by biasing means (not shown). The operation of each heating element is individually controlled by a thermal head driver (not shown), and an operation signal corresponding to image information from an image reading unit (not shown) provided at an upper portion of the apparatus body is input to a thermal head driver (not shown). Is done.
The thermal head 17 and the above-mentioned platen roller 16 constitute a plate making and conveying means 26 for making and conveying the master 24.
[0022]
A pair of front tension rollers 40 having an upper front tension roller 40a and a lower front tension roller 40b is disposed downstream of the platen roller 16 in the master transport direction. The front tension roller pair 40 has a function of applying tension to the master 24 on the downstream side of the platen roller 16, and is rotationally driven by the same drive source as the platen roller 16.
Downstream of the front tension roller pair 40, cutting means 18 for cutting the master 24 made at a predetermined position is provided, and a master guide plate 23 is provided downstream thereof.
The cutting means 18 is fixed to the apparatus main body, and has a lower blade and an upper blade. The cutting means 18 may be either a guillotine type or a rotary blade type.
[0023]
On the downstream side of the master guide plate 23, a master stock means 19 having an opening at the top for introducing a master is provided. The master stock unit 19 for temporarily storing the master 24 made of the plate includes a stock body 34 in the form of a housing, a suction fan 35 provided above the back of the stock body 34, and a stock body 34. A master removal tray 36 is provided so as to be able to be taken out and put in (taken out and put in) along the drawing path of the master.
A negative pressure is generated inside the master stock means 19 which is a closed space by the operation of the suction fan 35, and the plate-made master 24, which has been made and conveyed, is sucked toward the back of the master stock means 19. It is stored (see FIG. 4). Details of the master stock means 19 will be described later. In addition, each side surface (wall surface) of the stock body portion 34 has a thickness, but is indicated by a single line (the same in other drawings).
[0024]
A transport guide roller 60 and a guide member 57 are provided on the left side (downstream side) of the master stock unit 19. Below the guide member 57, the master 24 is wound around the plate cylinder 5 when the master 24 is wound. Tension applying means 61 for applying tension to prevent loosening is provided. The transport guide roller 60 is driven to rotate by the same drive source as the platen roller 16. The guide member 57 has a lower guide plate 58 and an upper guide plate 59. The tension applying means 61 is selectively positioned at a shaft 61a, a retracted position shown in FIG. 1 by a driving member (not shown) rotatably provided on the shaft 61a, and a contact position shown by a two-dot chain line in FIG. It has a movable arm 61b and a brake roller 61c rotatably supported at the tip of the movable arm 61b.
[0025]
A movable master guide plate 21 is arranged on the upper surface of the opening of the master stock means 19. The movable master guide plate 21 has a base end attached to a support shaft 21 a rotatably supported between side plates (not shown), and a master that has been conveyed by a stepping motor (not shown) provided in the plate making apparatus 3. The master 24 selectively occupies a transfer position indicated by a solid line that guides the master 24 to the pair of master transfer rollers 20 and a retracted position indicated by a two-dot chain line that does not hinder the master 24 from being guided inside the master stock means 19.
[0026]
A sheet feeding device 4 is disposed on the right side of the printing unit 2 and below the plate making device 3. The paper feeding device 4 includes a paper feeding tray 27, a paper feeding roller 28, a registration roller pair 29, and the like.
A paper feed tray 27 capable of stacking a large amount of paper P on its upper surface is supported by an apparatus main body (not shown) so as to be vertically movable, and moves up and down by the operation of a tray elevating means (not shown).
[0027]
A paper feed roller 28 is provided above the paper feed tray 27 and at a position corresponding to the leading end of the paper P in the transport direction. The paper feed roller 28 having a high frictional resistance member on its peripheral surface is rotatably supported between side plates (not shown) of the paper feed device 4 and is urged downward in FIG. 1 by urging means (not shown). . When the paper feed tray 27 is raised to a paper feed position by a tray elevating means (not shown), the paper feed roller 28 comes into pressure contact with the uppermost sheet P on the paper feed tray 27 with a predetermined pressure contact force. 1 is rotated clockwise in FIG. 1 by a paper feed motor (not shown).
A sheet separating member 30 made of a high friction resistance member is provided below the sheet feeding roller 28 and at a position downstream of the leading end of the sheet P in the sheet conveying direction on the sheet feeding tray 27 in the sheet conveying direction. I have. The sheet separating member 30 is pressed against the peripheral surface of the sheet feeding roller 28 with a predetermined pressing force by urging means (not shown).
[0028]
A registration roller pair 29 is disposed at a position downstream of the sheet feeding roller 28 and the sheet separating member 30 in the sheet conveying direction. A pair of registration rollers 29 each composed of a driving roller 29a and a driven roller 29b rotatably supported between side plates (not shown) of the sheet feeding device 4 are connected to a driving roller 29a which rotates by receiving a driving force from registration driving means (not shown). After the paper P pulled out from the paper feed tray 27 by the paper feed roller 28 is temporarily stopped by the driven roller 29b pressed against this, the paper P is directed between the plate cylinder 5 and the press roller 6 at a predetermined timing. Feed.
A paper guide plate 31 is provided at a position between the paper feed roller 28 and the registration roller pair 29, and a paper guide plate 32 is provided at a position downstream of the registration roller pair 29 in the paper transport direction. Each of the paper guide plates 31 and 32 is fixed to a side plate (not shown) of the paper feeding device 4.
[0029]
An image reading unit (not shown) for reading a document image is provided at an upper portion of the apparatus main body. The image data read by the image reading section is called after being stored in an image memory (not shown), and is made into a master 24 by the thermal head 17.
At the upper left of the printing unit 2, a plate discharging device (not shown) for separating the used master wound on the plate cylinder 5 is provided. The plate discharging device has a well-known structure having a plate discharging member that can be brought into contact with and separated from the peripheral surface of the plate cylinder 5, and includes a plate discharging box for storing a used master peeled off from the plate cylinder 5, and a used plate in the plate discharging box. It has a compression plate for compressing the master.
A discharge unit (not shown) for discharging the paper P printed by the print unit 2 to the outside of the apparatus is provided at the lower left of the print unit 2. The paper discharge unit has a well-known configuration including a peeling claw that peels the paper P from the outer peripheral surface of the plate cylinder 5, a paper transport unit that transports printed paper, a paper discharge tray on which printed paper can be stacked, and the like.
[0030]
The operation of the stencil printing apparatus 1 based on the above configuration will be described below.
When a document is set on the image reading unit and an operator presses a plate making start key on an operation panel (not shown) provided on an upper portion of the apparatus main body, an image reading operation and a plate discharging operation are performed in parallel. When the plate discharging operation is completed, the plate cylinder 5 is rotated to the plate feeding position where the clamper 8 is located almost right to the right side and stopped, and the clamper 8 is opened by the opening / closing means. It goes into a standby state.
At this time, the tension applying means 61 moves to the retreat position by the opening operation of the clamper 8.
In parallel with the image reading operation, the plate making device 3 performs a plate making operation. When the plate-making start key is pressed, a stepping motor (not shown) is operated to drive the platen roller 16 to rotate, the front tension roller pair 40 and the conveyance guide roller 60 to rotate, and the set master 24 is moved to the master roll. 24a. The drawn-out master 24 is subjected to plate making according to image data read when passing between the platen roller 16 and the thermal head 17.
[0031]
After the master making, the master 24 is conveyed by the front tension roller pair 40, guided by the conveyance guide roller 60 to the guide member 57, and abuts on the stopper 8b of the clamper 8 via the guide member 57. A master pool (flexure) 24e for smoothing suction is formed above the opening of the master stock means 19 by the subsequent excessive feed control.
Even if the leading end of the master 24 is curled, the leading end 24c of the master 24 is pushed by the clockwise rotation of the transport guide roller 60 as shown in FIG. Guided to.
If the surface frictional resistance of the transport guide roller 60 is large, such as a rubber roller, the master pool 24e will not be formed at a normal position above the opening of the master stock means 19 in excessive feeding, and the gap between the transport guide roller 60 and the stopper 8b will not be formed. To cause poor suction. In addition, there is a concern that the leading end of the master 24 may be caught at the position of the transport guide roller 60 to cause a transport failure.
[0032]
From such a viewpoint, the conveyance guide roller 60 has a normal surface with a small friction coefficient. In this embodiment, a sponge roller is employed. A metal roller, a plastic roller, or the like may be used. That is, the transport guide roller 60 does not have a transport function, but has a function of smoothly guiding the leading end of the master 24 to the guide member 57.
In the formation of the master pool 24 e in the excessive feed control, the transport guide roller 60 serves as a starting point of the formation, and the master pool 24 e is reliably formed above the opening of the master stock unit 19.
[0033]
When the predetermined overfeed is completed, the opening / closing means (not shown) is operated, the clamper 8 is closed, and the leading end of the master 24 is held. When the master 24 is held, a stepping motor that drives the movable master guide plate 21 operates. The movable master guide plate 21 is rotated clockwise, and is positioned at the retracted position as shown in FIG. The suction fan 35 operates simultaneously with the operation of the stepping motor.
After completion of the excessive feeding, the thermal head 17, the platen roller 16, the front tension roller pair 40, and the conveyance guide roller 60 continue to operate and rotate. It is stored inside the stock means 19.
[0034]
When the clamper 8 is closed, the brake roller 61c of the tension applying means 61 is set to the contact position as shown by a two-dot chain line, and the plate cylinder 5 is intermittently rotated at a low speed in the clockwise direction in FIG. The winding of the master 24 around the plate cylinder 5 is performed.
When the plate making operation proceeds and it is determined from the number of steps of a stepping motor (not shown) that drives the platen roller 16 that the master 24 for one plate has been made, the operation of the stepping motor is stopped and the cutting means 18 is operated. Then, the master 24 is disconnected. The cut master 24 is pulled out of the plate making device 3 by the rotation of the plate cylinder 5, and is wound around the outer peripheral surface of the plate cylinder 5.
When the winding operation is completed, a stepping motor (not shown) operates to rotate the movable master guide plate 21 counterclockwise around the support shaft 21a, and is positioned at the transport position shown in FIGS. .
[0035]
When the movable master guide plate 21 is positioned at the transport position, the paper feed roller 28 is driven to rotate and one sheet of paper P is fed from the paper feed device 4, and the plate cylinder 5 is moved clockwise at a low speed. It is driven to rotate. The sheet P separated and fed by the sheet separating member 30 has its leading end sandwiched between the nip portions of the pair of registration rollers 29 and is temporarily stopped to correct the skew.
The registration roller pair 29 is rotated at the timing when the leading end of the plate making image area of the master 24 wound on the plate cylinder 5 reaches a position corresponding to the press roller 6, and the sheet P is fed toward the printing unit 2. Sent.
[0036]
The press roller swinging means operates almost simultaneously with the operation of the registrar pair 29, and the press roller 6 comes into contact with the outer peripheral surface of the plate cylinder 5. By this contact, the porous support plate 5a, the mesh screen (not shown), the master 24, the paper P, and the press roller 6 contact with a predetermined pressing force, and the ink supplied to the inner peripheral surface of the plate cylinder 5 by the ink roller 11 is supplied. The image is transferred to the paper P via the opening 5b, the opening of the mesh screen (not shown), the porous resin film, the porous fiber film, and the thermoplastic resin film perforated portion of the master 24, and so-called printing is performed. The sheet P after printing is peeled from the outer peripheral surface of the plate cylinder 5 by a peeling claw (not shown), and is discharged onto a discharge tray (not shown) via a paper transport unit (not shown).
[0037]
After the printing operation, the operator operates a key on the operation panel to set a print image position, a printing speed, and the like, and then presses a test printing key (not shown). When the trial printing key is pressed, the plate cylinder 5 is driven to rotate at a rotational peripheral speed based on the set printing speed, and one sheet of paper P is fed from the sheet feeding device 4, which is the same as when the plate is attached. A trial print is performed. The operator checks the image by trial printing, sets the number of prints on the operation panel, and presses a print start key. As a result, the paper P is continuously fed from the paper feeding device 4, and printing is performed in the same manner as in the test printing described above.
When the set number of prints is exhausted, all operations are stopped, and the stencil printing machine 1 is again in a standby state.
[0038]
Next, the configuration of the master stock unit 19 and the master removing function will be described. As shown in FIG. 1, the housing or box-shaped stock main body portion 34 has a main storage space 34 </ b> A for drawing in and storing the stencil master 24 from the opening opened by the operation of the movable master guide plate 21. A sub-storage space 34B folded back above the main storage space 34A by the partition plate 34a, and a suction fan 35 is provided at the back of the sub-storage space 34B in the suction direction. On the right side of the suction fan 35 in the sub-storage space 34B, a filter 34b such as a wire mesh that allows the air flow to pass and prevents the cut pieces of the master 24 from entering is provided. On the suction fan 35 side of the filter 34b, there is provided a master detecting means 50 composed of, for example, a reflection type photo sensor.
[0039]
The master removal tray 36 has a flat tray body 37 that slides inside the bottom surface of the main storage space 34A (the bottom surface of the master stock unit 19), and a handle member 38 provided at an outer end of the tray body 37. ing. The tray body 37 and the handle member 38 are integrally formed of synthetic resin.
The handle member 38 also has a function as a side surface that closes the opening on the rear end side (in the direction away from the plate cylinder 5) of the main storage space 34A and the sub storage space 34B.
[0040]
The tip of the tray body 37 is bent upward, and the bent portion 37a is provided with a scraper 39 for rubbing the lower surface of the partition plate 34a which is the inner surface of the master stock means 19. The width of the scraper 39 is set to be substantially the same as the width of the partition plate 34a in the width direction of the master 24 orthogonal to the transport direction.
The handle member 38 is formed in a flat plate shape having an area slightly larger than the opening area on the rear end side of the main storage space 34A and the sub storage space 34B. In particular, the lower end is protruded to form a pull-out operation section 38a. ing.
In the setting of the master 24, when the master 24 is bent or curled, the leading end of the master 24 may be cut in order to accurately align the leading end. After being sucked into the tray 19, the tray body 37 is pulled out to the right side in the figure and removed. Even if the operator forgets to remove the cut piece 24d, the cut piece 24d is stuck to the filter 34b and detected by the master detecting means 50. For example, a warning is given on a liquid crystal display of an operation panel (not shown). Plate feeding troubles caused by a decrease in suction force are prevented.
[0041]
As described above, the transport guide roller 60 does not have a transport function, and only has to guide the leading end of the master 24. Therefore, as shown in FIG. 5, an annular groove 60c as a non-contact portion is formed in the axial direction. If a plurality of contact portions are provided and the area of the contact portion 60b is reduced to reduce the contact resistance with respect to the master 24, a smoother guide function can be obtained (second embodiment). In FIG. 5, reference numeral 60a indicates a rotation axis.
The shape of the transfer guide roller 60 having a small contact area is not limited to the shape shown in FIG. 5, and various patterns such as providing a plurality of semicircular concave portions or oblong concave portions on the outer peripheral surface can be adopted.
[0042]
【The invention's effect】
According to the first or seventh aspect of the present invention, there is provided a plate making and conveying means for making and conveying a master based on image information, and a pair of guide members in a non-sandwich state of the master which is made and conveyed by the plate making and conveying means. In a plate making apparatus in which the guide member is conveyed by a predetermined amount and its leading end reaches the clamper of the plate cylinder, the plate member is provided upstream of the guide member in the master conveying direction, and is rotated so as to push the master downward, thereby rotating the guide member. Since the transport guide rollers are provided to guide the leading end of the master, the transportability can be improved even for a master having a curled leading end, and plate feeding failure can be prevented.
[0043]
According to the second or seventh aspect of the present invention, in the plate making apparatus according to the first aspect, the transport guide roller is configured to be rotationally driven by the same drive source as the plate transport means. In addition, since a stepping motor or the like is not used in determining the clamp position, the cost can be reduced.
[0044]
According to the third or seventh aspect of the present invention, in the plate making apparatus according to the first or second aspect, the transport guide roller has a surface having a small friction coefficient. It is possible to prevent catching and improve transportability for master plate feeding.
[0045]
According to the fourth or seventh aspect of the present invention, in the plate making apparatus according to the first or second aspect, the transport guide roller has a shape having a small contact area with the master. Contact resistance can be reduced and transportability can be improved.
[0046]
According to the fifth or seventh aspect of the present invention, in the plate making apparatus according to the fourth aspect, the transport guide roller has a plurality of annular grooves spaced apart in the axial direction. The contact resistance can be further reduced, and the transportability can be improved.
[0047]
According to the invention described in claim 6 or 7, in the plate making apparatus according to any one of claims 1 to 5, the master conveyed by the plate making and conveying means by the plate making and conveying means is sucked by an air suction source and stored. Since the master stock means is provided, the master pool can be formed at an appropriate position, and defective suction can be prevented.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a stencil printing apparatus according to a first embodiment of the present invention.
FIG. 2 is a schematic front view showing a state in which a leading end of a master reaches a clamper and a master pool is formed by excessive feeding.
FIG. 3 is a diagram illustrating a guide function of a transport guide roller.
FIG. 4 is a schematic front view showing a state in which a master having been made is stored in a master stock unit.
FIG. 5 is a perspective view of a conveyance guide roller according to a second embodiment.
FIG. 6 is a schematic front view showing a conventional clamp position setting.
FIG. 7 is a diagram showing a state in which a curled master is hooked at an entrance of a guide member in a conventional configuration.
FIG. 8 is a diagram showing a state in which a curled master is curled at an entrance of a guide member in a conventional configuration.
[Explanation of symbols]
3 Plate Making Apparatus 5 Plate Cylinder 8 Clamp 19 Master Stock Means 24 Master 26 Plate Making Transport Means 35 Suction Fan 57 as Air Suction Source Guide Member 60 Transport Guide Roller 60c Annular Groove

Claims (7)

It has plate making and conveying means for making and conveying a master based on image information. The master made by the plate making and conveying means is conveyed by a predetermined amount while being guided by a pair of guide members in a non-sandwiched state, and the leading end thereof In the plate making device to reach the clamper of the plate cylinder,
A plate making apparatus comprising: a transfer guide roller provided upstream of the guide member in the master transfer direction and rotated to push the master downward to guide the leading end of the master to the guide member. The plate making device according to claim 1,
A plate-making apparatus, wherein the conveyance guide roller is driven to rotate by the same drive source as the plate-making conveyance means. The plate making device according to claim 1 or 2,
A plate making apparatus, wherein the transport guide roller has a surface property with a small friction coefficient. The plate making device according to claim 1 or 2,
A plate making apparatus, wherein the conveyance guide roller has a shape having a small contact area with a master. The plate making device according to claim 4,
A plate making apparatus, wherein the transport guide roller has a plurality of annular grooves spaced apart in the axial direction. The plate-making apparatus according to any one of claims 1 to 5,
A plate making apparatus comprising a master stock means for sucking and storing the master conveyed by the plate making and conveying means by an air suction source. In a stencil printing machine that performs printing by winding a master made by a plate making device around an outer peripheral surface of a plate cylinder,
A stencil printing machine, wherein the stencil making machine is the stencil making machine according to any one of claims 1 to 6.

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