JP3939851B2 - Printing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a printing apparatus, and more particularly to a mechanism for peeling and transporting printing paper from a plate cylinder after image transfer.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, there is a printing apparatus as an apparatus for transferring contents corresponding to an original image to a sheet, and one of the printing apparatuses is a stencil printing apparatus.
[0003]
In this stencil printing apparatus, a master punched in accordance with a document image by punching processing corresponding to plate making processing is mounted on a plate cylinder having an ink transmission structure, and an ink supply mechanism installed in the plate cylinder is used. An image is printed by leaching the ink and transferring the ink to a printing paper pressed against the plate cylinder. The plate making process may be performed by a plate making apparatus outside the stencil printing apparatus. Such a stencil printing apparatus has an advantage that economical image transfer can be performed because printing can be executed only by using one type of master when a large amount of printing is continuously performed.
[0004]
In the stencil printing apparatus described above, the printing paper that has been pressed against the plate cylinder, transferred ink, and printed with an image is separated from the plate cylinder and guided to a paper discharge apparatus that includes a paper discharge tray. Yes. The configuration for guiding the printing paper toward the paper discharge tray includes a peeling claw that can be brought into contact with and separated from the plate cylinder, a conveyance belt disposed near the separation claw, and the conveyance belt. There is a combination with a suction device to be attached (for example, JP-A-7-81202, JP-A-8-192564).
[0005]
On the other hand, in the stencil printing apparatus, a plurality of plate cylinders that perform printing of different colors such as two colors are juxtaposed, and the same printing paper is passed through these plate cylinders, so that the printing paper is conveyed in the process of conveying the printing paper. There is a configuration in which multicolor printing such as colors can be performed simultaneously (for example, Japanese Patent Application No. 9-131428 filed by the applicant of the present application).
[0006]
Even in this case, as a configuration for separating the printing paper from each plate cylinder, the printing paper is sucked and adhered to the peeling claw, the conveyance belt, and the conveyance belt at the rear portion of the transfer position in each plate cylinder as described above. There is a case where a configuration in which a suction device is combined is used.
[0007]
[Problems to be solved by the invention]
By the way, the structure which combined the peeling nail | claw mentioned above, a conveyance belt, and the suction device had the following malfunctions.
[0008]
That is, the printing paper that is peeled off from the plate cylinder surface by the peeling claw does not leave the plate cylinder surface immediately after peeling off, and is reattached to the plate cylinder surface, thereby causing a conveyance failure such as a jam due to peeling failure. The reason is as follows.
The conveying belt that receives the printing paper peeled off from the plate cylinder by the peeling claw is a peripheral surface of the plate cylinder to prevent interference with a holding mechanism in which a master holding clamper or the like equipped on the plate cylinder is used. It is often arranged at a position away from
[0009]
On the other hand, the print paper peeled from the surface of the plate cylinder may have remarkably different peelability depending on the material, thickness and size, ink adhesion amount, and the environment at the time of peeling.
For example, if there is a solid image that tends to increase the amount of ink adhering to the leading end in the transport direction when it is thin, or if static electricity is likely to occur in a low humidity environment, the plate cylinder surface and printing paper The adhesion between the two becomes higher. For this reason, when the peeling nail enters between the two, the image is rubbed and dirty due to the fact that the rubbing by the peeling nail is likely to occur, or the peeling by the peeling nail is surely performed due to adhesion. The absence of the printing paper may cause a so-called rolling-up phenomenon in which the printing paper rotates with the plate cylinder and rotates with the plate cylinder over the position facing the peeling claw, which may cause a peeling failure.
[0010]
In order to ensure that the print paper is peeled even when the adhesion of the print paper becomes high, a suction force from the transport belt side is applied when the front end of the print paper is peeled from the plate cylinder surface by the peeling claw. However, as described above, there are restrictions not only on the arrangement position of the conveyor belt, but also on the arrangement of the suction device, and the suction force works well. The current situation is that it cannot be made.
[0011]
When a plurality of plate cylinders are used side by side, if the above-mentioned printing paper peeling failure occurs in the previous plate cylinder, printing in the next stage cannot be performed, or the press roller is pressed in the next plate cylinder. There is a possibility that the printing start position on the printing paper is shifted due to a difference between the start time and the arrival time of the printing paper, resulting in color unevenness.
[0012]
An object of the present invention is to provide a printing apparatus having a configuration capable of preventing a conveyance failure such as a jam due to a defective peeling of a printing sheet peeled from a plate cylinder surface in view of the problems in the conventional printing apparatus. It is in.
[0013]
Another object of the present invention is, for example, when a plurality of plate cylinders are used to perform printing of different colors, it is possible to ensure that the printing paper is conveyed to the next plate cylinder and to prevent misalignment of the printed image. An object of the present invention is to provide a printing apparatus having a configuration capable of preventing the occurrence of color unevenness.
[0014]
[Means for Solving the Problems]
In order to achieve this object, the invention according to claim 1 is characterized in that the ink is transferred from the master by supplying ink with the master mounted on the surface of the plate cylinder, printing is performed on the printing paper, and the printing is completed. Thereafter, in a printing apparatus that peels off and discharges the printing paper that is in close contact with the plate cylinder surface, the printing cylinder is brought into contact with and separated from the plate cylinder in the vicinity of the peeling claw provided so as to be able to contact and separate from the plate cylinder. A transport belt and a suction device for sucking and adhering the print paper to the transport belt, and the transport claw and the transport belt at a time point when the peeling claw is in proximity to the plate cylinder and peels the leading edge of the print paper. At least the transport belt of the suction device can be brought close to the plate cylinder , and the transport belt is stretched around a pair of pulleys arranged along the transport direction of the printing paper. , That That stretched direction end is swingable so as to approach with respect to the plate cylinder by the timing to avoid interference with the master clamping mechanism which is arranged on the plate cylinder surface expanding direction end as a fulcrum It is a feature.
[0016]
According to the second aspect of the present invention, the ink is transferred while the master is mounted on the surface of the plate cylinder so that the ink is transferred from the master and printing is performed on the printing paper. In a printing device that peels off and discharges printing paper
A plurality of the plate cylinders are juxtaposed, and at least one of the plate cylinders is provided with a peeling claw capable of contacting and separating from the plate cylinder in the vicinity of the plate cylinder located on the upstream side in the conveyance direction of the printing paper. In the vicinity of the peeling claw, a conveying belt capable of coming into contact with and separating from the plate cylinder and a suction device for sucking and adhering the printing paper to the conveying belt are arranged. At a time when the leading edge of the printing paper is peeled off and at least the conveying belt of the conveying belt and the suction device is at a timing to avoid interference with the master clamping mechanism arranged on the plate cylinder surface. It is characterized by approaching the trunk.
[0017]
【Example】
Details of the present invention will be described below with reference to embodiments shown in the drawings.
FIG. 1 is a schematic view showing a stencil printing apparatus which is one of printing apparatuses according to an embodiment of the present invention.
[0018]
In FIG. 1, a stencil printing apparatus 1 includes a plate cylinder 2 capable of rotating in the forward and reverse directions.
An ink supply mechanism 3 is disposed inside the plate cylinder 2, and in the vicinity of the plate cylinder 2, a plate making unit 10 and a plate discharging unit 30 are disposed above one and the other across a vertical line passing through the center of the plate cylinder 2. The image reading unit 100 is disposed above the plate cylinder 2.
The plate cylinder 2 is provided so as to be able to rotate forward and backward by a rotating shaft 2A, and a mesh screen (not shown) is attached to the peripheral surface thereof. The mesh screen has a large number of openings except for a part thereof so that ink can be exuded. The plate cylinder 2 is provided with a master clamping mechanism having a swingable clamper 2B on the surface thereof, and when the tip of the master is located in a portion where no hole is formed on the peripheral surface of the plate cylinder, the tip of the master is held. It can be held. The master is adhered by ink exuding on the surface of the plate cylinder 2 except for the tip.
[0019]
The ink supply mechanism 3 includes an ink roller 3A that contacts the inner peripheral surface of the plate cylinder 2 and a doctor roller 3B that rotates while contacting the ink roller 3A. The press roller 4 is disposed so as to face the peripheral wall. The ink is stored in a wedge-shaped space formed at the facing portion between the ink roller 3A and the doctor roller 3B, is transferred to the facing portion with the press roller 4 as the ink roller 3A rotates, and oozes onto the surface of the plate cylinder 2.
[0020]
The press roller 4 is provided so as to be able to come into contact with and separate from the peripheral surface of the plate cylinder 2, and presses against the surface of the plate cylinder 2 when a printing paper S fed from a paper feeding device 5 described later arrives. Used to transfer ink from the perforations to the surface of the printing paper S.
[0021]
The plate making unit 10 performs a perforation process using the thermal head 12 based on image information from the image reading unit 100 in a process in which the roll-shaped master 11 mounted on the core material 11A is fed out by the platen roller 13 and the conveying roller 14. Then, when the master 11 having a required length is fed out, it can be cut by the cutter 15. The master 11 after being punched out from the plate making unit 10 is held by the master clamping mechanism whose tip is located on the plate cylinder 2 as described above.
[0022]
The plate discharging unit 30 is formed on the master cylinder 11 from above the plate cylinder 2 by using a belt 32 that is stretched between one roller 30A that can come in contact with and separate from the plate cylinder 2 and the other roller 30B that is positioned in the vicinity of the plate discharging box 31. Is recovered, and the recovered master 11 is compressed by the compression member 33.
[0023]
The image reading unit 100 includes a light source 103 that illuminates the document P fed from the automatic document feeder onto the document placement table 101, a plurality of reflecting mirrors 105 that guide reflected light from the document P toward the CCD 104, and a connection. An image lens 106 is provided, and the CCD 104 receives reflected light from the document, and outputs image information corresponding to the document image to the control unit 20. The control unit 20 outputs a drive signal to the thermal head 12 of the plate making unit 10 based on the image information.
[0024]
A paper feed device 5 is disposed on one side of a press roller 4 that can come in contact with and separate from the plate cylinder 2, and a printing paper discharge / conveyance device 41 is disposed on the other side.
[0025]
The paper feeding device 5 prevents the double feeding of the printing paper S fed by the feeding roller 6 that contacts the uppermost one of the printing paper S stacked on the paper feed tray 5A by the separation rollers 7 and 8. Thus, the sheet is fed toward the plate cylinder 2 by the registration roller 9. The registration roller 9 sets the sheet feeding timing so as to be aligned with the image position of the master 11 mounted on the plate cylinder 2.
[0026]
The discharge conveyance device 41 sucks and conveys the printing paper S peeled off by the peeling claw 40 located in the vicinity of the plate cylinder 2 by a conveyance belt 44 wound around rollers 42 and 43 and a suction device 46 located below the belt. Then, the sheet is discharged toward a sheet discharge tray 52 described later.
[0027]
The paper discharge tray 52 is disposed on an extended line of the conveyance path of the printing paper S to be discharged by the discharge conveyance device 41. Although not shown in detail, the discharge plate 52 is supported to be tiltable with the end portion on the main body side of the stencil printing device 1 as a fulcrum. Has been. As shown in FIG. 1, the paper discharge tray 52 is tilted at the time of printing, and takes a position to receive the print paper S discharged from the discharge conveyance device 41.
[0028]
FIG. 2 is a schematic diagram for explaining the principle configuration of the discharge conveyance device 41.
In FIG. 2, a transport belt 44 of the discharge transport device 41 has one end in the stretching direction among rollers 42 and 43 positioned at both ends in the stretching direction, that is, the downstream side in the transport direction of the printing paper S indicated by an arrow F in FIG. The support shaft 43A of the roller 43 located at the center is pivotally supported. For this reason, the other end in the extending direction of the conveying belt 44 where the roller 42 is located can swing so as to be able to contact and separate from the plate cylinder 2.
The support shaft 43A is provided integrally with a support arm 41A having an L-shaped side view. A roller 42 and a cam follower 41B are rotatably provided at the swing end of the support arm 41A. Further, a suction device 46 is integrated under the support arm 41A.
[0029]
Both ends of an elastic body 41C such as a tension spring are hung between the swinging end of the support arm 41A and the non-moving portion of the stencil printing apparatus 1, so that the support arm 41A is clockwise in FIG. A swinging behavior is given.
[0030]
The cam follower 41B is in contact with the outer peripheral surface of a cam 41D that is rotatably supported in the stationary part of the stencil printing apparatus 1. The cam 41D is a master having a large-diameter portion that can bring the upper surface of the swinging end of the support arm 41A where the roller 42 is located closer to the printing cylinder S in the plate cylinder 2 and the clamper 2B (see FIG. 1). A cam profile having a small-diameter portion that can be moved away from the plate cylinder 2 so that the clamping mechanism and the support arm 41A do not interfere with each other is formed.
[0031]
The cam 41D moves the swinging end of the support arm 41A of the plate cylinder 2 at the timing when the peeling claw 40 peels the printing paper S close to the plate cylinder 2 as the timing when the large diameter portion faces the cam follower 41B. The timing at which the suction force by the suction device 46 can be applied to the printing paper S by approaching the surface and the timing at which interference with the master clamping mechanism of the plate cylinder 2 can be avoided is set. In the present embodiment, the cam 41D rotates in synchronization with the rotation of the plate cylinder 2 so that the above-described timing is obtained.
[0032]
Since the present embodiment is configured as described above, when the printing paper S is not fed to the plate cylinder 2, the cam 41D in the discharge conveyance device 41 has a small diameter portion at the support arm 41A side cam follower during non-printing. It faces 41B. As a result, the support arm 41A is maintained at a position where the swing end moves away from the surface of the plate cylinder 2. At this time, the suction device 46 is controlled to be stopped, so that suction force is not generated.
[0033]
When the printing paper S is fed from the paper feeding device 5 to the plate cylinder 2 and the printing paper S is pressed against the surface of the plate cylinder 2 by the press roller 4, printing is performed from the plate cylinder 2. In order to peel the paper S, the peeling claw 40 comes close to the surface of the plate cylinder 2. At this time, the suction device 46 is controlled to the operating state.
As the peeling claw 40 approaches the surface of the plate cylinder 2, the large diameter portion of the cam 41D faces the cam follower 41B. At this time, the support arm 41A has a swing end at the surface of the plate cylinder 2 as shown by a solid line from a two-dot chain line in FIG. To approach. Thereby, the discharge conveyance device 41 can apply the suction force from the suction device 46 to the surface of the plate cylinder 2 to which the peeling claw 40 is close.
[0034]
The printing paper S that has been peeled off from the surface of the plate cylinder 2 by the peeling claw 40 has a suction force from the suction device 46 acting on the surface of the plate cylinder 2 at the peeling position. The apparatus 41 is attracted to the conveying belt 44 side and is sucked and conveyed by the conveying belt 44.
[0035]
In the present invention, the suction device 46 is not only integrated with the support arm 41A so as to approach the plate cylinder 2 together with the transport belt 44, but also independently of the transport belt 44 in advance. It is also possible to configure such that only the conveyor belt 44 approaches the plate cylinder 2 while being fixed to the stationary part.
FIG. 5 shows an example in which the suction device 46 is arranged independently of the support arm 41A. In the figure, the suction device 46 is attached to a plurality of rollers including rollers 42 and 43. An immobile portion (not shown) is brought close to a position where a suction force can be applied to the front end portion of the printing paper S peeled from the surface of the plate cylinder 2 inside the conveyor belt 44 that is wound around. It is fixed. With such a configuration, the suction device 46 can be disposed at a position where the suction force acting on the front end of the printing paper S is increased, and the printing paper S can be reliably sucked toward the transport belt 44. it can.
[0036]
In such a configuration, when the suction device 46 is fixed in the vicinity of the plate cylinder 2, the suction force is applied to the peeling position of the printing paper S in the plate cylinder 2 as shown in FIG. 5. Since the suction device 46 can be arranged in advance at a position where it is easy to act, the suction force for sucking toward the transport belt 44 is acting on the leading edge of the printing paper S at the moment when it is peeled off. become. As a result, the peeled print paper S is reliably sucked and transported by the transport belt 44 without causing a time lag from the moment when it is peeled.
[0037]
According to the present embodiment, the support arm 41A of the discharge conveyance device 41 is swung at a timing that does not interfere with the clamper 2B included in the plate cylinder 2 with a simple configuration that only synchronizes the rotation of the cam 41D with the plate cylinder 2. Therefore, it is possible to reliably transport the leading end of the printing paper S that has been peeled off with a simple configuration toward the discharge / conveyance device 41 immediately after peeling, without providing a special contact / separation mechanism.
[0038]
By the way, the above-described discharge conveyance device 41 can be applied to, for example, a configuration in which a plurality of plate cylinders are juxtaposed in order to perform printing of different colors.
[0039]
FIG. 4 shows a case where the first plate cylinder 2 for printing the first color and the second plate cylinder 2 ′ for printing the second color are juxtaposed. The present invention is not limited to such a number of plate cylinders, and the number of plate cylinders can be set so as to correspond to the multicolor printing mode.
Further, the plurality of plate cylinders 2 and 2 'may be the same color, and when only the original portion at a specific place is changed with respect to the original of the first plate cylinder 2, it is printed on the second plate cylinder 2'. It is also possible to make the master of the second plate cylinder 2 ′ appropriately and perform printing.
[0040]
In the figure, each of the first and second plate cylinders 2 and 2 'has the configuration shown in FIG. 1, and at least the upstream side in the transport direction of the printing paper S among the plate cylinders 2 and 2'. A discharge conveyance device 41 having the same configuration as that shown in FIG. 2 is provided in the vicinity of the separation position of the printing paper S in the first plate cylinder 2 located at the position. In the embodiment shown in FIG. 4, a discharge transport device 41 ′ is also provided near the separation position of the printing paper S in the second plate cylinder 2 ′. In this case, the discharge transport device 41 on the first plate cylinder 2 side is The printing paper S peeled from the first plate cylinder 2 is also provided with a function of guiding it toward the second plate cylinder 2 ′.
[0041]
In the present embodiment, the discharge conveyance devices 41 and 41 ′ provided corresponding to the first and second plate cylinders 2 and 2 ′ correspond to the time when the printing paper is peeled off from each plate cylinder 2 and 2 ′. In addition, the timing at which the swinging end of the support arm 41A (see FIG. 2) approaches the vicinity of the peeling position of each plate cylinder 2, 2 ′ when the plate cylinders 2, 2 ′ do not interfere with the clampers 2B, 2B ′. It is set by the cam 41D (see FIG. 2). For this reason, the discharging and conveying devices 41 and 41 ′ are arranged such that the swinging end of the support arm 41A approaches the plate cylinders 2 and 2 ′ when the sheet S is peeled off from the plate cylinders 2 and 2 ′. A suction force from (see FIG. 2) is applied.
[0042]
Since the present embodiment is configured as described above, when not printing, the discharge conveying devices 41 and 41 ′ are arranged such that the swing end side of the support arm 41A (see FIG. 2) is the first and second plate cylinders 2, 2 ′. It is maintained in a state away from the vicinity of the peeling position. As a result, as in the case shown in FIG. 2, the support arm 41A is moved away from the plate cylinders 2 and 2 ′. At this time, the suction device 46 is controlled to be stopped, so that the suction force is not generated. The
[0043]
When the printing paper S conveyed from the first plate cylinder 2 is printed on the second plate cylinder 2 ′, a peeling claw (denoted by reference numeral 40 ′ for convenience) exists between the surface of the plate cylinder 2 ′ and the printing paper S. Proximity to the surface of the second plate cylinder 2 'so that it can enter.
The cam 41D (see FIG. 2) rotates at a timing that does not interfere with the clamper 2B ′ in synchronization with the rotation of the second plate cylinder 2 ′, and the swing end of the support arm 41A (see FIG. 2) is used as the surface of the plate cylinder 2 ′. Approach the vicinity (see FIG. 4A). As a result, in the same manner as in the case shown in FIG. 3, the printing paper S is applied to the surface of the second plate cylinder 2 ′ immediately after being peeled from the second plate cylinder 2 ′ by the peeling claw 40 ′. The suction force from 46 attracts the transport belt 44 ′ of the discharge transport device 41 ′ and sucks and transports it.
[0044]
On the other hand, when printing by the first plate cylinder 2 is performed, as shown in FIG. 4B, the discharge conveying device 41 on the first plate cylinder 2 side approaches the first plate cylinder 2 and the second plate cylinder 2 The discharge conveyance device 41 ′ on the plate cylinder 2 ′ side is kept away from the second plate cylinder 2 ′. When the discharge conveyance device 41 approaches the surface of the first plate cylinder 2, the suction force from the suction device 46 is likely to act on the printing paper S peeled from the first plate cylinder 2, and the printing paper S The sheet is sucked and conveyed by the discharge conveying device 41 and conveyed toward the second plate cylinder 2 ′.
In the second plate cylinder 2 ′, a press roller (indicated by reference numeral 4 ′ for convenience) swings toward the second plate cylinder 2 ′ in accordance with the timing when the printing paper S conveyed by the discharge conveyance device 41 arrives. The printing paper S is pressed.
[0045]
When printing is performed on the second plate cylinder 2 ′, as shown in FIG. 4C, the separation of the printing paper S by the separation claws (indicated by reference numeral 40 ′ for convenience) on the second plate cylinder 2 ′ side starts. Is done. In accordance with this peeling, the discharge conveying device 41 ′ on the second plate cylinder 2 ′ side brings the swinging end of the support arm 41A closer to the surface of the second plate cylinder 2 ′. On the other hand, in the present embodiment, the discharge conveyance device 41 on the first plate cylinder 2 side causes the discharge conveyance device 41 ′ on the second plate cylinder 2 ′ side to transfer the print paper S until the conveyance of the printing paper S is completed. Until the suction conveyance is started, the swinging end of the support arm 41 </ b> A is brought close to the surface of the first plate cylinder 2. As a result, when the desired color is printed by combining the first color and the second color, the printing paper S peeled off from the first plate cylinder 2 is surely supplied to the second plate cylinder 2. Therefore, it is possible to accurately maintain the paper feed timing on the second plate cylinder 2 'side, thereby preventing image misalignment and color unevenness.
[0046]
【The invention's effect】
As apparent from the above examples, according to the invention of claim 1 Symbol placement, when the leading end of the printing paper separation claw is close is peeled against the plate cylinder, yet the master clamping mechanism Since at least the conveyance belt and the suction belt of the conveyance belt and the suction device approach the plate cylinder at a timing to avoid the interference, the suction device is disposed at a position where the suction adhesion force is favorably applied to the leading edge of the printing paper that has started to peel off. be able to. As a result, the printing paper can be sucked and adhered to the conveyance belt before the printing paper rolls up, and the printing paper can be reliably prevented from jamming.
[0047]
According to the invention described in claim 2 , for example, for a plurality of plate cylinders arranged side by side to perform printing of different colors, at least one of the plate cylinders located upstream in the conveyance direction of the printing paper Since the printing paper to be peeled from the cylinder can be the target, when the printing paper is peeled off, at least the conveyance belt of the conveyance belt and the suction device for sucking the printing paper can be brought close to the plate cylinder surface. By disposing the suction device that sucks the printing paper at a position where the suction force acting on the front end of the printing paper peeled off from the former plate cylinder is increased, the printing paper can be reliably sucked toward the conveying belt. As a result, the delivery time of the printing paper in the latter plate cylinder does not get out of order. Therefore, the printing paper transport timing is set in accordance with the printing start time in the latter plate cylinder, and the positional deviation or color unevenness of the printed image is set. Can be prevented.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing a stencil printing apparatus as an example of a printing apparatus according to an embodiment of the present invention.
FIG. 2 is a schematic diagram for explaining a principle configuration of a discharge conveyance device used in the stencil printing apparatus shown in FIG. 1;
FIG. 3 is a schematic diagram for explaining the operation of the discharge conveyance device shown in FIG. 2;
FIG. 4 is a schematic diagram for explaining the operation of a discharge conveyance device used when a printing apparatus according to another embodiment of the present invention is used, and FIG. 4A is a discharge of printing paper from a second plate cylinder. (B) shows the time when the printing paper is discharged from the first plate cylinder, and (C) shows that the printing paper conveyed from the first plate cylinder to the second plate cylinder is printed on the second plate cylinder and discharged. Each state is shown.
FIG. 5 is a schematic diagram for explaining a partial modification of the stencil printing apparatus shown in FIG. 1;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Stencil printing apparatus 2, 2 'Plate cylinder 40, 40' Peeling claw 41, 41 'Discharge conveyance apparatus 41A Support arm 41B Cam follower 41D Cam 42, 43 Roller 43A Support shaft 44 which makes a rocking fulcrum of a support arm Conveyor belt 46 Suction apparatus

Claims (2)

By supplying ink with the master mounted on the surface of the plate cylinder, the ink is transferred from the master and printing is performed on the printing paper. After printing, the printing paper that is in close contact with the plate cylinder surface is peeled off. In the printing device that discharges
In the vicinity of the peeling claw provided so as to be able to come into contact with and separate from the plate cylinder, a conveying belt capable of coming into contact with and separated from the plate cylinder and a suction device for sucking and adhering the printing paper to the conveying belt. It is possible to place at least the transport belt of the transport belt and the suction device close to the plate cylinder when the separation claw is disposed and the leading end of the printing paper is stripped close to the plate cylinder . The conveying belt is stretched by being stretched around a pair of pulleys arranged along the conveying direction of the printing paper, and a master clamping mechanism arranged on the plate cylinder surface with one end in the extending direction as a fulcrum. A printing apparatus, wherein the other end in the extending direction is swingable so as to approach the plate cylinder at a timing to avoid interference . By supplying ink with the master mounted on the surface of the plate cylinder, the ink is transferred from the master and printing is performed on the printing paper. After printing, the printing paper that is in close contact with the plate cylinder surface is peeled off. In the printing device that discharges
A plurality of the plate cylinders are juxtaposed, and at least one of the plate cylinders is provided with a peeling claw capable of contacting and separating from the plate cylinder in the vicinity of the plate cylinder located on the upstream side in the conveyance direction of the printing paper. In the vicinity of the peeling claw, a conveying belt capable of coming into contact with and separating from the plate cylinder and a suction device for sucking and adhering the printing paper to the conveying belt are arranged. At a time when the leading edge of the printing paper is peeled off and at least the conveying belt of the conveying belt and the suction device is at a timing to avoid interference with the master clamping mechanism arranged on the plate cylinder surface. A printing apparatus characterized in that the printing apparatus is brought close to a cylinder.

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