JP3795638B2 - Plate making and conveying device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stencil printing apparatus, and more particularly to a plate making and conveying apparatus that conveys a plate-making master to a plate cylinder.
[0002]
[Prior art]
On the outer peripheral surface of the plate cylinder of a conventionally used stencil printing apparatus, there is provided a locking member for sandwiching the leading end portion of the master that has been made. This locking member is mainly composed of a stage portion parallel to the axis of the plate cylinder and an openable / closable clamper, and the clamper opens and closes each time a new master-printed master is wound, and clamps the leading end of the master. .
[0003]
[Problems to be solved by the invention]
In general, the master is transported to the locking member while being guided by the guide member by a platen roller, a feed roller provided on the downstream side in the transport direction, a tension roller that applies tension to the master, and the like. However, in order to avoid interference with the rotating plate cylinder, these rollers and guide members cannot be arranged so close to the outer peripheral surface of the plate cylinder. Therefore, when using a master with a curl, such as a master that is unused and stored at high temperature for a long period of time, the tip of the master will be caught by the clamper when it is transported to the locking member, causing master breakage, clamping error, and clamp skew. There is a problem that printing causes a defective print.
[0004]
The present invention solves the above-described problems and provides a plate-making conveyance device for a stencil printing apparatus that can be reliably locked to a locking member by any master.
[0005]
[Means for Solving the Problems]
According to the first aspect of the present invention, there is provided a stencil printing apparatus which has a conveying means for conveying the master, and which conveys the master toward an openable and closable clamper disposed on the outer peripheral surface of the plate cylinder. In the plate-making transport device,
A guide plate that guides the master between the transport unit and the clamper that occupies the plate-feed standby position for locking the master in the master transport path , the guide plate serving as the plate- feed standby It faces the inside of the clamper opened at a position, and when the clamper is closed, the clamper is provided so as to be able to interlock with the clamper through a guided master .
[0006]
According to a second aspect of the present invention, there is provided a plate making and conveying apparatus of the stencil printing apparatus according to the first aspect, wherein a gap is provided between the clamper opened at the plate feeding standby position and the guide plate facing the inner side of the clamper. And the master guided by the guide plate is conveyed through the gap.
[0007]
According to a third aspect of the present invention, in the plate making and conveying apparatus of the stencil printing apparatus according to the first or second aspect, the guide plate further includes a restricting portion for restricting movement of the master in the width direction. And
[0008]
【Example】
FIG. 1 is a side view of an essential part of a stencil printing apparatus adopting an embodiment of the present invention. In the figure, a rotational force is applied to the outer peripheral surface of the rotatable plate cylinder 1 to an openable / closable clamper 2 and stage unit 3 for holding the master on the outer peripheral surface of the plate cylinder 1 and a press roller (not shown). And a rotational force applying member 4 for the purpose. The plate cylinder 1 is rotationally driven by a stepping motor (not shown).
[0009]
A stage portion 3 having a flat portion parallel to the generatrix of the plate cylinder 1 is formed integrally with the plate cylinder 1. A clamper 2 is attached to the stage portion 3 so as to be freely opened and closed by a support shaft 2a. The clamper 2 is formed by bonding an iron plate 2A and a rubber plate 2B, and the iron plate 2A is formed wider. The clamper 2 is formed with a plurality of notches 2b for avoiding guide claws described later.
[0010]
A gear 5 is attached to one end of the support shaft 2a at a position protruding outward from the flange 1A of the plate cylinder 1. The gear 5 meshes with a sector gear 6 that is swingably attached to the outer surface of the flange 1A.
[0011]
A fan-shaped gear 6 having a gear portion 6a is supported at its base end by a pin 7, and its swing range is restricted by a pin 8 engaged with a long hole 6b formed in the vicinity of the gear portion 6a. . A cam portion 6c is formed at a portion between the portion supported by the pin 7 of the sector gear 6 and the portion supported by the pin 8, and an outer peripheral surface of a cam roller 9 described later is in contact with the cam portion 6c. A positioning portion 6d for holding the clamper 2 in an open state is formed near the gear portion 6a. The other end of the tension coil spring 26 having one end fixed to the vicinity of the center portion of the plate cylinder 1 is attached to the center side end portion of the plate cylinder 1 of the gear portion 6a. A rotational biasing force toward the center side of the plate cylinder 1 around 7 is applied.
[0012]
A cam roller 9 shown in FIG. 3 is disposed inside the main body of the stencil printing apparatus near the flange 1 </ b> A side of the plate cylinder 1. The cam roller 9 is rotatably supported at one end of a support shaft 9a, and the other end of the support shaft 9a is supported by a support shaft 10a on a machine frame (not shown) of the stencil printing apparatus main body so as to be swingable. It is attached to one end. A plunger 11a of a solenoid 11 attached to the stencil printing apparatus main body is attached to the other end of the arm member 10 so as to be swingable. Further, one end of the arm member 10 is attached with the other end of a tension coil spring 13 having one end fixed to the side plate 12 of the stencil printing apparatus main body. With this configuration, when the solenoid 11 is energized and the plunger 11a is attracted, the cam roller 9 is moved leftward in FIG. 3 and cams its peripheral surface as shown by a solid line in FIG. When the energization to the solenoid 11 is cut off, the solenoid coil 11 is moved to the right in FIG. 2 by the urging force of the tension coil spring 13 to release the contact state with the cam portion 6c on the peripheral surface.
[0013]
A dog 1a is attached to the flange of the plate cylinder 1 facing the flange 1A, as shown in FIG. A sensor 14 for detecting the dog 1a when the plate cylinder 1 rotates is disposed in the stencil printing apparatus main body in the vicinity of the plate cylinder 1 and at a position corresponding to the rotation locus of the dog 1a. The dog 1a and the sensor 14 detect the energization timing of the solenoid 11.
[0014]
A plate making and conveying device 15 is disposed above the plate cylinder 1. The plate-making conveyance device 15 is a tension roller pair 16 composed of a driving roller 16a and a driven roller 16b, which is a master conveying means, an entrainment prevention roller 17 that prevents the master 20 from being entrained in the driving roller 16a, and the master 20 toward the clamper 2. The reversing roller pair 18 composed of the driving roller 18a and the driven roller 18b to be sent out, the guide plate 19 disposed between the tension roller pair 16 and the reversing roller pair 18, and the driven roller 18b integrally attached to the guide plate 19 The guide claw 21 for preventing the master 20 from sticking to the head, the guide plate 22 for guiding the master 20 sent from the reversing roller pair 18 toward the clamper 2, and the like are mainly configured. Each roller rotates in the direction of the arrow in the figure.
[0015]
As shown in FIGS. 5 and 6, the guide plate 22 is rotatably supported by bearings 22 a, 22 a provided at both upper ends on a support shaft 23 provided in the stencil printing apparatus main body. Both sides of the guide plate 22 are formed wider than the upper part having the bearing portions 22a and 22a, and both end portions are bent to form restricting portions 22b and 22b. The length L of the flat portion of the guide plate 22 is shorter than the distance L1 from the upper portion to the tip of the restricting portion 22b, and the interval W between the restricting portions 22b and 22b is wider than the width of the rubber plate 2B. And it is set so that it may become narrower than the width | variety of the iron plate 2A. One end of the support shaft 23 is engaged with a stationary member 24 fixed to the main body of the stencil printing machine, and the other end is engaged with a restricting portion 22b. Torsion coils 25, 25 correspond to the restricting portions 22b. As a result, the guide plate 22 is given a rotational biasing force in the counterclockwise direction in FIG. Further, the guide plate 22 is positioned at a position shown in FIG. 1 by a stopper (not shown) provided in the stencil printing apparatus main body, and the clockwise rotation is allowed from this state.
[0016]
Based on the above configuration, the operation of this stencil printing apparatus will be described below.
When the plate removal operation is completed and the plate cylinder 1 is located at the home position where the clamper 2 is located directly above, the plate cylinder 1 starts to rotate in the counterclockwise direction in FIG. Operates to make the master 20.
[0017]
When the plate cylinder 1 further rotates and the dog 1a is detected by the sensor 14, and then the plate cylinder 1 rotates at a predetermined angle, the solenoid 11 is energized and the plunger 11a is sucked, and the cam roller 9 contacts the cam portion 6c. Moved to a possible position. When the plate cylinder 1 further rotates, the cam portion 6c rides on the outer peripheral surface of the cam roller 9, and the gear 5 engaged with the swing of the sector gear 6 receives the rotational force, so that the clamper 2 is as shown in FIG. Released.
[0018]
When the plate cylinder 1 further rotates from the state shown in FIG. 7, both side portions of the iron plate 2 </ b> A of the clamper 2 come into contact with the tips of the restricting portions 22 b and 22 b, and the guide plate 22 in FIG. It is rotated in the turning direction. When the plate cylinder 1 further rotates and the cam roller 9 engages with the positioning portion 6d, the rotation of the plate cylinder 1 is stopped and the clamper 2 is positioned at the plate feed standby position shown in FIG. In this state, a gap s is formed between the rubber plate 2 </ b> B of the clamper 2 and the guide plate 22, and the master 20 that has been subjected to plate making passes through the gap s and is located between the clamper 2 and the stage unit 3. It is supplied to the back side.
[0019]
At the time of this plate feeding, the master 20 that has been made is conveyed while being guided by the restricting portions 22b and 22b at both ends while preventing the guide claw 21 from scratching the driven roller 18b. The movement of the master 20 in the width direction is restricted, thereby preventing a positional shift.
[0020]
When it is determined from the number of steps of a stepping motor that drives a platen roller (not shown) of the plate making means that the leading end of the master 20 has reached a predetermined plate feeding position, the energization of the solenoid 11 is cut off. Thereby, the arm member 10 is rotated counterclockwise in FIG. 3 about the support shaft 10a by the urging force of the tension coil spring 13, and the cam roller 9 engages the outer peripheral surface with the positioning portion 6d. Move to the position to be released. The sector gear 6 is rotated counterclockwise in FIG. 2 by the urging force of the tension coil spring 26 and the weight of the clamper 2, and the clamper 2 is in a position shown in FIG. By rotating, the master 20 is sandwiched between the clamper 2 and the stage unit 3.
[0021]
At this time, the rubber plate 2B of the clamper 2 and the guide plate 22 come into contact with each other via the master 20 which is made of plate, and the master 20 is stretched between the rubber plate 2B and the guide plate 22 and between the clamper 2 and the stage unit 3. Therefore, the generation of wrinkles on the master 20 can be suppressed.
[0022]
When the master 20 is sandwiched between the clamper 2 and the stage unit 3, the plate cylinder 1 starts to rotate in the clockwise direction from the state shown in FIG. During this time, the plate making operation for the master 20 by the plate making means (not shown) is continued. The rotational peripheral speed of the plate cylinder 1 at this time is set to a speed substantially equal to the plate making speed of the plate making means.
[0023]
If it is determined from the number of steps of the stepping motor (not shown) of the plate making means that the plate making for one plate has been completed, the operation of the plate making means is stopped and the cutting means (not shown) is activated to cut the master 20. During this time, the plate cylinder 1 continues to rotate, and the cut master 20 is pulled out with the rotation of the plate cylinder 1 and wound on the outer peripheral surface of the plate cylinder 1. As shown in FIGS. 10 and 11, the guide plate 22 is rotated counterclockwise by the urging force of the torsion coil 25 while being in contact with both side portions of the iron plate 2A. When the contact state is released, the initial position shown in FIG. 1 is restored.
[0024]
【The invention's effect】
According to the first aspect of the present invention, since the guide plate that can enter between the clamper and the outer peripheral surface of the plate cylinder is provided when the clamper is opened, the guide of the master transported to the point just before being delivered to the clamper is performed. Can do.
[0025]
According to the second aspect of the present invention, since the guide plate is provided which enters between the clamper and the outer peripheral surface of the plate cylinder when the clamper is opened and can be interlocked with the clamper when the clamper is closed. Are brought into contact with each other through the master, and the master is held between the clamper and the outer peripheral surface of the plate cylinder while being stretched by the clamper and the guide plate, so that generation of wrinkles on the master can be suppressed.
[0026]
According to the third aspect of the invention, since the guide plate has the restricting portion that restricts the movement of the master in the width direction, the movement of the master in the width direction is restricted, so that the misalignment at the time of plate feeding can be prevented. Can be prevented.
[Brief description of the drawings]
FIG. 1 is a side view of a main part of a stencil printing apparatus showing an embodiment of the present invention.
FIG. 2 is a perspective view illustrating a clamper opening / closing mechanism used in an embodiment of the present invention.
FIG. 3 is a perspective view illustrating a clamper opening / closing mechanism used in an embodiment of the present invention.
FIG. 4 is a perspective view for explaining a clamper opening / closing mechanism used in an embodiment of the present invention.
FIG. 5 is a diagram illustrating a guide plate used in an embodiment of the present invention.
FIG. 6 is a perspective view illustrating a clamper and a guide plate used in an embodiment of the present invention.
FIG. 7 is a side view of the main part of the stencil printing apparatus for explaining the operation in one embodiment of the present invention.
FIG. 8 is a side view of the main part of the stencil printing apparatus for explaining the operation in one embodiment of the present invention.
FIG. 9 is a side view of the main part of the stencil printing apparatus for explaining the operation in one embodiment of the present invention.
FIG. 10 is a side view of the main part of the stencil printing apparatus for explaining the operation in one embodiment of the present invention.
FIG. 11 is a side view of the main part of the stencil printing apparatus for explaining the operation in one embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Plate cylinder 2 Clamper 15 Plate-making conveyance apparatus 16 Conveyance means (tension roller pair)
20 Master 22 Guide plate 22b Restriction part

Claims (3)

In the plate making and conveying apparatus of the stencil printing apparatus for conveying the master toward an openable and closable clamper disposed on the outer peripheral surface of the plate cylinder and having a conveying means for conveying the master,
A guide plate that guides the master between the transport unit and the clamper that occupies the plate-feed standby position for locking the master in the master transport path , the guide plate serving as the plate- feed standby A stencil printing apparatus, wherein the stencil printing apparatus is provided so as to be interlocked with the clamper while contacting the clamper via a guided master when the clamper is closed while facing the inside of the clamper opened at a position. Plate-making conveyance device. A gap is formed between the clamper opened at the plate feeding standby position and the guide plate facing the inner side of the clamper, and the master guided by the guide plate is conveyed through the gap. The stencil conveying apparatus for a stencil printing apparatus according to claim 1 .   The plate making and conveying apparatus of the stencil printing apparatus according to claim 1, wherein the guide plate has a restricting part that restricts movement of the master in the width direction.

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