JP4598365B2 - Plate making equipment / Stencil printing equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a plate making apparatus for making a master (stencil paper) based on image information and a stencil printing apparatus having the plate making apparatus.
[0002]
[Prior art]
In the stencil printing apparatus, an integrated apparatus that automatically and continuously performs each operation such as a plate discharging operation, a plate making operation, a plate feeding operation, and a printing operation is mainly used. In this integrated stencil printing apparatus, when a start key is pressed after an original is set by an operator, a printing operation is performed after a plate discharging operation, a plate making operation, and a plate feeding operation are performed.
However, in a normal apparatus, since the plate making operation is performed after the completion of the plate discharging operation, it is necessary to wait for the completion of the plate discharging operation when making the next plate, and there is a problem that the first print time (FPT) becomes long.
Therefore, there is a master stock means that sucks the pre-printed master by the negative pressure of the airflow and temporarily stores it, making the plate in parallel with the plate removal operation, or making the next plate during the printing operation. A technique for improving work efficiency by shortening the print time is disclosed in, for example, Japanese Patent Application Laid-Open No. 2000-353949.
[0003]
In this type of stencil printing apparatus, a stencil jam may occur. For example, a master transport roller pair for supplying a pre-made master to the plate cylinder is provided downstream of the master stock means in the master transport direction (hereinafter simply referred to as “downstream side”). Does not enter the nip portion of the master transport roller pair and is guided along the outer peripheral surface of one of the master transport roller pairs, or the master is charged with static electricity before the nip of the master transport roller pair. There is a case where a plate-feed jam occurs.
When a plate-feed jam occurs, the tip of the master often breaks or breaks. If the master is transported in a state where there is a crease or the like at the tip of the master, a plate-feed jam will occur again.
[0004]
Conventionally, when a plate feeding jam occurs, after the master is reset by the user, a predetermined amount of the master is fed to cut the leading end of the master. That is, a measure is taken so that a portion where there is a crease or tear and a portion that may be present are cut to prevent the occurrence of plate jam again.
Not only for plate feeding jam, but also when the operator sets a roll master prior to plate making operation or when the platen roller is removed and reset to clean the thermal head, etc. There is a case.
The cut piece of the master cut in this way is accommodated in the master stock means and is manually removed by the operator.
[0005]
[Patent Document 1]
JP-A-7-117322
[Problems to be solved by the invention]
When the plate feeding operation is performed in a state where the operator has forgotten to remove the master cut piece, the suction force is reduced because the cut piece prevents the suction force of the air suction source of the master stock means, and the master made by the plate making becomes the master. There was a case where a plate jam occurred due to overflowing outside the entrance of the master stock means without being stored in the stock means.
In addition, if a misfeed occurs in the plate cylinder, the leading edge of the master that has been sent is drawn into the master stock means, and the master overflows into the master stock means or overflows outside the entrance of the master stock means. The cutting accuracy of the means may be reduced.
[0007]
SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a plate making apparatus capable of reliably grasping forgetting to remove a cut piece or a plate feeding mistake in plate movement and preventing plate feeding failure, and a stencil printing apparatus having the plate making apparatus. .
[0008]
[Means for Solving the Problems]
In order to achieve the above object, according to the first aspect of the present invention, the plate making and conveying means for making the plate and conveying the master based on the image information, and the master conveyed by the plate making and conveying by the plate making and conveying means are sucked by the air suction source. In the plate making apparatus having the master stock means for storing, the air suction source is provided at the back of the suction path of the master stock means, and an air flow is passed and the passage of the master is prevented before the suction direction of the air suction source. The filter is provided, the master detection means is provided on the air suction source side of the filter, and has a notification means for notifying when the master is detected by the master detection means. Yes.
[0009]
In invention of Claim 2, in the plate-making apparatus of Claim 1,
The master detecting means also has a configuration that also serves as a function of detecting a misfeed to the plate cylinder of the master that has been made.
[0010]
According to a third aspect of the present invention, in the plate making apparatus according to the second aspect , the normal master storage capacity in the master stock means when there is no misfeed to the plate cylinder is set to an amount that is not detected by the master detection means. It has been configured to be.
[0011]
In the invention according to claim 4, in the plate making apparatus according to claim 2 or 3 , when a plate feeding mistake is detected, the plate making is stopped and the master is disconnected, and the warning means that the notification means is a plate feeding mistake. It has a configuration of “Yes”.
[0012]
According to a fifth aspect of the present invention, in the plate making apparatus according to any one of the first to fourth aspects, the master stock means includes a main storage space extending along a master transport direction, and the main storage space. The sub-storage space is folded upward from the back in the suction direction, the air suction source is provided at the back in the suction direction of the sub-storage space, and the folding portion is provided to be openable. Adopted.
[0013]
According to a sixth aspect of the present invention, in the stencil printing apparatus that performs printing by winding the master made by the plate making apparatus around the outer peripheral surface of the plate cylinder , the plate making apparatus is any one of the first to fifth aspects. The plate making apparatus described in the above is adopted.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an 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, a stencil printing apparatus 1 includes a printing unit 2, a plate making apparatus 3, and a paper feeding apparatus 4.
The printing unit 2 is located substantially in the center of the apparatus main body (not shown), and is in contact with the plate cylinder 5 that is rotated in the clockwise direction in FIG. A press roller 6 is provided that is detachable and presses the sheet P fed from the sheet feeding device 4 against the plate cylinder 5.
The plate cylinder 5 has a cylindrical porous support plate 5a attached to each peripheral surface of a pair of flanges (not shown) at both side edges, and a plurality of layers wound around the outer periphery of the porous support plate 5a (not shown). The porous support plate 5a is formed with an aperture portion having a plurality of apertures 5b.
[0016]
A non-opening portion of the porous support plate 5a is provided with a stage portion 7 having a plane along one generatrix of the plate cylinder 5, and a clamper supported on the stage portion 7 so as to be opened and closed by a support shaft 8a. 8 is disposed.
The clamper 8 is opened and closed by opening / closing means (not shown) when the plate cylinder 5 occupies a predetermined position.
An ink supply means 9 is disposed inside the plate cylinder 5. The ink supply means 9 includes an ink supply pipe 10 that also serves as a support shaft of the plate cylinder 5, an ink roller 11, a doctor roller 12, and the like.
The ink supply pipe 10 is disposed between a pair of flanges (not shown), and each flange is rotatably supported via a bearing (not shown). An ink pump and an ink pack (not shown) are connected to the ink supply pipe 10, respectively, and the ink in the ink pack is supplied to the inside of the plate cylinder 5 from a plurality of ink supply holes 10 a provided in the ink supply pipe 10 by the operation of the ink pump. To be supplied.
The intake roller 11 is rotatably supported between a pair of side plates (not shown) disposed between a pair of flanges (not shown) and fixed to the ink supply pipe 10. Synchronously driven to rotate in the same direction.
The ink roller 11 is disposed at a position where a slight gap is generated between the peripheral surface thereof and the inner peripheral surface of the plate cylinder 5.
[0017]
A doctor roller 12 is disposed in the vicinity of the ink roller 11. The doctor roller 12 is also rotatably supported between side plates (not shown) like the ink roller 11 and is rotated in the reverse direction in synchronization with the ink roller 11 by a rotation driving means (not shown). The doctor roller 12 is disposed at a position where a slight gap is generated 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 the ink reservoir 13 is formed by storing the ink supplied from the ink supply hole 10a in this space. The ink in the ink reservoir 13 is supplied in a thin layer on the circumferential surface of the ink roller 11 when passing through the proximity of the ink roller 11 and the doctor roller 12, and the plate cylinder 5 is pressed by the press roller 6. At this time, the peripheral surface of the intake roller 11 and the inner peripheral surface of the plate cylinder 5 come into contact with each other, and the inner surface of the plate cylinder 5 is supplied.
[0018]
A press roller 6 is disposed below the plate cylinder 5. A press roller 6 having substantially the same length as the axial length of the plate cylinder 5 and having an elastic body such as rubber wound around the core portion 6a has a pair of press roller arms 14 at both ends of the core portion 6a. Are rotatably supported between one end of each. A pair of press roller arms 14 which are plate-like members are fixed at the other end to a press roller shaft 15 rotatably supported by an apparatus main body (not shown), and are integrally formed by a press roller swinging means (not shown). Rocks. By this swinging, the press roller 6 has a separation position shown in FIG. 1 where the peripheral surface is separated from the outer surface of the plate cylinder 5 and a pressing position where 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 apparatus 3 is disposed on the upper right side of the printing unit 2. The plate making apparatus 3 includes a master storage member (not shown), a platen roller 16, a thermal head 17, a front tension roller pair 40, a cutting means (cutting means) 18, a master transport guide 23, a master stock means 19, a master transport roller pair 20, a movable A master guide plate 21 and a plate supply guide plate 22 are provided.
Master storage members (not shown) are respectively provided on a pair of side plates (not shown) of the plate making apparatus 3, and support a core portion 24b of a master roll 24a in which the master 24 is wound in a roll shape so as to be rotatable and detachable. . The master 24 in the present embodiment has a laminate 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 material is further laminated on the surface. (See JP-A-10-147075). This master has the characteristics that the ink can be uniformly transferred (high image quality) and the ink consumption can be reduced although the stiffness is weak and the strength is low.
A platen roller 16 is arranged on the left side of the arrangement position of the master roll 24a. The platen roller 16 is formed such that its axial length is substantially the same as 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.
[0020]
A thermal head 17 is disposed below the platen roller 16. The thermal head 17 is formed to have a width larger than the length in the width direction of the platen roller 16, and a plurality of heating elements are disposed on the upper surface thereof, so that the heating elements are pressed against the peripheral surface of the platen roller 16. Further, it is biased by a 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 on the upper part of the apparatus body is input to the thermal head driver (not shown). Is done.
The thermal head 17 and the platen roller 16 described above constitute a plate making and conveying means 26 for carrying out plate making and conveyance of the master 24.
[0021]
A front tension roller pair 40 having an upper front tension roller 40a and a lower front tension roller 40b is disposed on the downstream side of the platen roller 16.
The platen roller 16 and the upper front tension roller 40a are integrally supported by a cover 42 that can rotate upward with a shaft 41 as a fulcrum.
On the downstream side of the front tension roller pair 40, a master guide plate 23 is provided as a hook member for hooking the curled tip of the master 24, and the cutting means 18 is arranged at the central portion of the master guide plate 23. Has been.
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.
[0022]
On the downstream side of the cutting means 18, a master stock means 19 having an opening for introducing a master in the upper part is disposed. The master stock means 19 for temporarily storing the master-made master 24 includes a stock main body 34 having a casing shape, and a suction fan 35 as an air suction source provided at the upper part of the stock main body 34. A master removing tray 36 is provided so as to be freely inserted into and removed from the stock main body 34 along the drawing path of the master.
A negative pressure is generated inside the master stock means 19 which is a space sealed by the operation of the suction fan 35, and an air flow af as shown by an arrow is formed. It is sucked and stored toward the back of the means 19 (see FIG. 6). Details of the master stock means 19 will be described later. In addition, each side surface (wall surface) in the stock main body 34 actually has a thickness but is displayed with a single line (the same applies to other drawings).
[0023]
A master transport roller pair 20 is disposed on the left side (downstream side) of the master stock means 19. The master conveying roller pair 20 has a driving roller 20a and a driven roller 20b that are rotatably supported between side plates (not shown), and is in pressure contact with a driving roller 20a that is rotationally driven by driving means (not shown). The master 24 is nipped and conveyed by the driven roller 20b. The driving roller 20a is provided with a one-way clutch (not shown).
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 21a rotatably supported between side plates (not shown), and is a master that is transported by plate making by a stepping motor (not shown) provided in the plate making apparatus 3. It selectively occupies a conveyance position indicated by a two-dot chain line that guides 24 to the master conveyance roller pair 20 and a retraction position indicated by a solid line that does not get in the way when the master 24 is guided into the master stock means 19.
On the left side of the master conveyance roller pair 20, a master guide plate 22 that guides the plate-making master 24 conveyed by the master conveyance roller pair 20 to the printing unit 2 is disposed. The master guide plate 22 is fixed between side plates (not shown).
[0024]
A paper feeding device 4 is disposed on the right side of the printing unit 2 and below the plate making device 3. The sheet feeding device 4 includes a sheet feeding tray 27, a sheet feeding roller 28, a registration roller pair 29, and the like.
A paper feed tray 27 on which a large amount of paper P can be stacked is supported by an apparatus body (not shown) so as to be movable up and down, and is moved up and down by operation of a tray lifting means (not shown).
[0025]
A paper feed roller 28 is disposed above the paper feed tray 27 and at a position corresponding to the front end of the paper P in the transport direction. A paper feed roller 28 having a high friction 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 an urging means (not shown). . The paper feed roller 28 presses the uppermost paper P on the paper feed tray 27 with a predetermined pressure when the paper feed tray 27 is raised to the paper feed position by a tray lifting / lowering means (not shown), and feeds the paper feed device 4. 1 is rotated in the clockwise direction in FIG.
A sheet separating member 30 made of a high friction resistance member is disposed 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. Yes. The sheet separating member 30 is pressed against the peripheral surface of the sheet feeding roller 28 with a predetermined pressing force by an urging means (not shown).
[0026]
A registration roller pair 29 is disposed at a position downstream of the paper feed roller 28 and the paper separating member 30 in the paper transport direction. A registration roller pair 29 composed of a driving roller 29a and a driven roller 29b, both of which are rotatably supported between side plates (not shown) of the sheet feeding device 4, is connected to a driving roller 29a that is rotated by a driving force transmitted from registration driving means (not shown). After the paper P drawn from the paper feed tray 27 by the paper feed roller 28 is temporarily stopped by the driven roller 29b brought into pressure contact therewith, it is directed between the plate cylinder 5 and the press roller 6 at a predetermined timing. To feed.
A sheet guide plate 31 is disposed at a position between the sheet feeding roller 28 and the registration roller pair 29, and a sheet guide plate 32 is disposed at a position downstream of the registration roller pair 29 in the sheet conveyance direction. Each of the paper guide plates 31 and 32 is fixed to a side plate (not shown) of the paper feeding device 4.
[0027]
An image reading unit (not shown) for reading a document image is provided on the upper part of the apparatus main body. The image data read by the image reading unit is stored after being stored in an image memory (not shown), and is called up by the thermal head 17 to make the master 24.
On the upper left side of the printing unit 2, there is provided a plate removal device (not shown) that peels off the used master wound on the plate cylinder 5. The plate discharging apparatus has a well-known configuration having a plate discharging member that can come into contact with and separate from the peripheral surface of the plate cylinder 5, and is used in the plate discharging box for storing the used master peeled off from the plate cylinder 5 and in the plate discharging box. A compression plate for compressing the master is provided.
On the lower left side of the printing unit 2, a paper discharge unit (not shown) for discharging the paper P printed by the printing unit 2 to the outside of the apparatus is provided. The paper discharge unit has a known configuration including a peeling claw for peeling the paper P from the outer peripheral surface of the plate cylinder 5, a paper transport unit for transporting printed paper, a paper discharge tray on which printed paper can be stacked, and the like.
[0028]
Based on the above configuration, the operation of the stencil printing apparatus 1 will be described below.
When an original is set in the image reading unit and a plate making start key on an operation panel (not shown) provided on the upper portion of the apparatus body is pressed by an operator, an image reading operation and a plate discharging operation are performed in parallel. When the plate removal operation is completed, the plate cylinder 5 rotates and stops to the plate feeding position where the clamper 8 is located almost rightward, and the clamper 8 is opened by the opening / closing means, so that the stencil printing apparatus 1 is shown in FIG. It will be in a standby state.
In parallel with the image reading operation, the plate making apparatus 3 performs the plate making operation. When the plate making start key is pressed, a stepping motor (not shown) is operated to rotate the platen roller 16, and a driving means (not shown) is operated to drive the front tension roller pair 40 and the master transport roller pair 20 to rotate. Then, the set master 24 is pulled out from the master roll 24a. The drawn master 24 is made according to the image data read when passing between the platen roller 16 and the thermal head 17.
[0029]
When the leading end of the master 24 is sandwiched between the master conveying roller pair 20, the operation of the driving means (not shown) is stopped, the rotation of the master conveying roller pair 20 is stopped, and a stepping motor that drives the movable master guide plate 21 is provided. Operate. The movable master guide plate 21 is rotated in the clockwise direction, and is positioned at a retracted position indicated by a solid line in FIG. Further, the suction fan 35 is operated simultaneously with the operation of the stepping motor.
The thermal head 17, the platen roller 16, and the front tension roller pair 40 continue to operate even after the master conveying roller pair 20 is stopped, and the master 24 that has been subjected to plate making is sucked by the suction fan 35, and is shown in FIG. 6. Thus, it is stored inside the master stock means 19. Then, when the plate removal operation is completed and the plate cylinder 5 is in the plate feed standby state shown in FIG. 6 and the master 24 having a predetermined amount or more is stored in the master stock means 19, the drive means (not shown) is activated. Thus, the master transport roller pair 20 is rotationally driven, and the master 24 is transported between the stage unit 7 and the opened clamper 8.
[0030]
When it is determined that the front end of the master 24 has reached a predetermined position between the stage portion 7 and the clamper 8, the opening / closing means is operated to close the clamper 8, and the front end of the master 24 is the outer peripheral surface of the plate cylinder 5. While being held on, the operation of the driving means (not shown) is stopped, and the rotation of the master conveying roller pair 20 is stopped. After the clamper 8 is closed, the plate cylinder 5 is intermittently rotated at a low speed in the clockwise direction in FIG. 4, and the master 24 is wound around the plate cylinder 5.
When the plate making operation proceeds and it is determined that the master 24 for one plate has been made from the number of steps of a stepping motor (not shown) that drives the platen roller 16, the operation of the stepping motor is stopped and the cutting means 18 is activated. Then, the master 24 is disconnected. The cut master 24 is drawn from the plate making apparatus 3 by the rotation of the plate cylinder 5 and wound on the outer peripheral surface of the plate cylinder 5.
When the winding operation is completed, a stepping motor (not shown) is operated, and the movable master guide plate 21 is rotated counterclockwise about the support shaft 21a, and is positioned at the conveyance position indicated by a two-dot chain line in FIG. .
[0031]
When the movable master guide plate 21 is positioned at the transport position, the paper feed roller 28 is driven to rotate and a sheet of paper P is fed from the paper feeder 4 and the plate cylinder 5 is rotated clockwise at a low speed. Driven by rotation. The paper P separated and fed by the paper separation member 30 is temporarily stopped with its leading edge sandwiched between the nip portions of the registration roller pair 29, and the skew is corrected.
The registration roller pair 29 is rotationally driven 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 paper P is fed toward the printing unit 2. Sent.
[0032]
The press roller swinging means operates almost simultaneously with the operation of the registrar pair 29, and the press roller 6 contacts 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 come into contact with each other 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 transferred. It is transferred to the paper P through the opening 5b, the opening of a mesh screen (not shown), the porous resin film of the master 24, the porous fiber film, and the thermoplastic resin film perforated portion, and so-called printing is performed. The printed paper P is peeled off from the outer peripheral surface of the plate cylinder 5 by a peeling claw (not shown) and discharged onto a paper discharge tray (not shown) via a paper transport unit (not shown).
[0033]
After the printing operation, the operator operates a key on the operation panel to set a print image position or a printing speed, 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 P is fed from the paper feeding device 4 and is the same as at the time of printing. Trial printing is performed. The operator confirms the image by trial printing, sets the number of prints on the operation panel, and then presses the 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 the trial printing described above.
When the set number of prints is consumed, all the operations are stopped, and the stencil printing apparatus 1 enters the standby state again.
[0034]
Next, the configuration of the master stock means 19 and the master removal function will be described. As shown in FIG. 1, a housing or box-shaped stock main body 34 has a main storage space 34 </ b> A for drawing and storing the master 24 that has been made from the opening opened by the operation of the movable master guide plate 21. The auxiliary storage space 34B is folded back to the upper side of the main storage space 34A by the partition plate 34a, and the suction fan 35 is provided on the back side in the suction direction of the auxiliary storage space 34B. A filter 34b such as a wire mesh is provided on the right side (before the suction direction) of the suction fan 35 in the auxiliary storage space 34B to allow the air flow to pass and prevent the cut piece of the master 24 from entering.
Master detection means 50 for detecting the master 24 is provided on the suction fan 35 side of the filter 34b. A reflection type photosensor is used as the master detection means 50 in the present embodiment. You may use the mechanical detection means turned on and off with a contactor, such as a filler which protrudes to the opposite side of the filter 34b.
[0035]
The master removal tray 36 includes a flat tray body 37 that slides inside the bottom surface of the main storage space 34 </ b> A (the bottom surface of the master stock means 19), and a handle member 38 provided at the 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 (direction away from the plate cylinder 5) of the main storage space 34A and the sub storage space 34B.
The master removal tray 36 can be inserted and removed freely by the handle member 38, whereby the folded portion of the main storage space 34A can be opened.
[0036]
The front end portion of the tray body 37 is bent upward, and a scraper 39 that slides on the lower surface of the partition plate 34a that is the inner surface of the master stock means 19 is provided in the bent portion 37a. The width of the scraper 39 is set to be approximately 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 protrudes to form a drawer operation portion 38a. ing.
[0037]
Next, a master setting method according to this embodiment will be described with reference to FIGS. As described above, in the present embodiment, the master 24 that is particularly stiff and easily curls is used, and has a configuration suitable for such a master set that is easily curled.
First, as shown in FIG. 2, the cover 42 is rotated upward to open the master conveyance path. In this state, the master 24 is pulled out from the master roll 24 a, and the curled tip 24 c is hooked on the downstream end (edge) of the master guide plate 23. The amount to be hooked may be appropriate as long as the hooked state is not released. After the hooking, as shown in FIG. 3, the cover 42 is closed and the master 24 is sandwiched between the platen roller 16 and the thermal head 17 and between the front tension roller pair 40.
Since the tip 24c of the master 24 is caught by the master guide plate 23, the tip 24c of the master 24 is held without being rounded while the operator releases the hand and closes the cover 42.
[0038]
When the cover 42 is closed, the suction fan 35 operates and the cutting means 18 operates to cut the tip of the master 24. In the present embodiment, the position cut by the cutting means 18 is a predetermined position of the master 24 set.
The cut piece 24d thus cut is sucked by the suction force of the suction fan 35 and sticks to the filter 34b. The master detection means 50 detects when it sticks to the filter 34b.
Information detected by the master detection means 50 is input to the control means 51 as shown in FIG. The control means 51 in the present embodiment is a microcomputer having a CPU, a ROM, a RAM, an I / O interface, and the like, and can also serve as the main controller of the stencil printing apparatus 1.
When the control means 51 receives the detection signal from the master detection means 50, the control means 51 outputs, for example, a display “Master remains in the suction box” to the liquid crystal display section 53 of the operation panel 52 of the stencil printing apparatus 1. Make a warning. The control means 51 and the liquid crystal display unit 53 constitute notification means. The operation panel 52 here functions as a part of the plate making apparatus 3.
The notification method of the notification means is not limited to the character display method, but may be a notification method using sound or light, or may be a combination of these (for example, displaying characters simultaneously with sound). After the warning is given, the suction fan 35 is turned off.
[0039]
Upon receiving this warning, the operator performs the removal work of the cut piece 24d.
As shown in FIG. 5, the operator pulls out the tray main body 37 by the handle member 38 and removes the cut piece 24d. In this case, even if there is another cut piece in close contact with the lower surface of the partition plate 34 a by electrostatic force, it is easily removed by the rubbing of the scraper 39. Removal of the cut piece 24d completes the setting of the master 24.
When the setting of the master 24 is completed, the movable master guide plate 21 is positioned at the transport position, and the plate making start key is pressed to perform the plate making operation described above.
In the present embodiment, the detection / removal operation of the cut piece 24d in the case where the leading end portion of the master 24 is curled has been described, but the same applies to the cut piece generated by resetting the master.
[0040]
If the plate feeding process is normally performed after the setting of the master 24 is completed, as shown in FIG. 6, the master 24 made with the master 24 being sandwiched by the master conveying roller pair 20 is the master 24. It is stored in the stock means 19.
The normal (normal) master storage capacity in the master stock means 19 is set to an amount that is not detected by the master detection means 50. That is, the amount is set such that the rear end portion of the master 24 does not contact the filter 34b in the main storage space 34A.
However, as described above, the leading end portion of the master 24 does not enter the nip portion of the master transport roller pair 20 and is guided along the outer peripheral surface of one of the master transport roller pairs 20, or the master 24 is electrostatically charged. In some cases, a paper feeding jam may occur due to sticking to a conveyance guide or the like before the nip of the master conveyance roller pair 20. In the present embodiment, since a particularly weak master is used, there is a high possibility of a plate-feed jam.
[0041]
When a plate-feed jam occurs, the master 24 is drawn into the master stock means 19 and its leading end sticks to the filter 34b and is detected by the master detection means 50, as shown in FIG.
When the control means 51 receives the detection signal from the master detection means 50, it determines that a plate feeding error has occurred, stops the plate making operation, operates the cutting means 18 to cut the master 24, and supplies the liquid crystal display unit 53 with the plate feeding. A warning is displayed to indicate that an error (in other words, a clamping error on the plate cylinder 5) has occurred.
Upon receiving this warning, the operator removes the cut master 24 in the same manner as the cut piece 24d. When a plate feeding mistake occurs, plate making is performed again.
[0042]
【The invention's effect】
According to the present invention, it is possible to prevent the removal forgetting the master in the master stock means, it is possible to prevent the plate feed failure due to the suction force reduction.
[0043]
According to the present invention, it is possible to prevent damage to the master sensing means due to the contact of the master, the reliability of the detection accuracy can be maintained over a long term.
[0044]
According to the present invention, it is possible to cope with the plate feed trouble easy easy and inexpensive construction.
[0045]
According to the present invention , it is possible to prevent erroneous detection when there is no misfeed .
[0046]
According to the present invention, it is possible to stop the waste of manufacturing plate to a minimum, it is possible to expedite the removal operation.
[0047]
According to the present invention, it is possible to easily without being obstructed the removal operation of the master to the harness of the air suction source, the quality of the state of the suction passage in the vicinity of the air suction source so can be viewed from the opening It can be easily judged.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a stencil printing apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic front view showing a state where a cover is opened and a master is set.
FIG. 3 is a schematic front view showing a state in which a cover is closed and a front end portion of a master is cut.
FIG. 4 is a control block diagram.
FIG. 5 is a schematic front view showing an operation of removing a cut piece of a master.
FIG. 6 is a schematic front view showing a state in which a pre-made master is stored in master stock means.
FIG. 7 is a schematic front view showing a state in the master stock means when a misfeeding occurs.
[Explanation of symbols]
3 Plate making apparatus 5 Plate cylinder 19 Master stock means 24 Master 26 Plate making transport means 34b Filter 34A Main storage space 34B Sub storage space 35 Suction fan 50 as air suction source 50 Master detection means

Claims (6)

In a plate making apparatus having a plate making and conveying means for making and conveying a master based on image information, and a master stock means for sucking and storing the master conveyed by the plate making and conveying means by an air suction source,
The air suction source is provided at the back of the suction path of the master stock means,
Before the suction direction of the air suction source, a filter that allows air flow and prevents the passage of the master is provided, and the master detection means is provided on the air suction source side of the filter,
A plate making apparatus, comprising: a notification means for notifying when a master is detected by the master detection means. The plate making apparatus according to claim 1,
A plate making apparatus, wherein the master detection means also has a function of detecting a plate feed error to a plate cylinder of a plate made master . In the plate making apparatus according to claim 2 ,
A plate making apparatus characterized in that a normal master storage capacity in the master stock means when there is no misfeed to the plate cylinder is set to an amount not detected by the master detection means . In the plate making apparatus according to claim 2 or 3 ,
A plate-making apparatus characterized in that when a plate-feeding error is detected, the plate-making is stopped and the master is disconnected, and the notification means warns that a plate- feeding error has occurred . In the plate making apparatus according to any one of claims 1 to 4 ,
The master stock means has a main storage space extending along the conveyance direction of the master, and a sub storage space folded upward from the suction direction back of the main storage space, and the suction direction back of the sub storage space The plate making apparatus, wherein the air suction source is provided, and the folded portion is provided so as to be openable. In a stencil printing apparatus that performs printing by winding a master made by a plate making apparatus around an outer peripheral surface of a plate cylinder ,
The plate making apparatus, the stencil printing machine which is a platemaking apparatus according to any one of claims 1 to 5.

Images