JPH10100527A - Apparatus and method for discharging plate of stencil printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To recover surely a used original plate of a stencil printer. SOLUTION: An original plate 14 wound around a plate cylinder 10 is separated, and its specific amount is carried by a conveying device 26. After conveying until a tip part of the original plate to which ink is not stuck reaches above a presser roller frame 52, a conveying roller 34 of the conveying device 26 is made to abut against a plate discharging roller 42. At that time the tip part of the original plate is prevented from abutting against the plate dicharging roller 42 with the presser roller frame 52. An printing area of the original plate following the tip part of the orginal plate is successively pressed with the plate discharging roller 42 by the conveying roller 34 to be stuck thereto with the ink stuck to a rear side of the printing area, which is wound around that. Besides, the tip part of the original plate is pressed onto the following printing area which is preliminarily stuck onto the plate discharging roller 42 with the presser roller 48, and stuck thereto with the ink oozed out on a front side of the printing area of the original plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate discharging device for peeling a used stencil of a stencil printing machine from a plate cylinder, winding the stencil in a roll, and storing the stencil.

[0002]

2. Description of the Related Art There is known a stencil printing machine provided with a plate discharging device for peeling a used original plate wound around a plate cylinder from a plate cylinder and winding the plate in a roll shape. Since ink has adhered to the used master, the master can be wound around a roll by the adhesive force of the ink. In such a plate discharging device, the used masters are collected in a roll, so that a large amount of used masters can be stored in the printing press. Work can be performed without soiling the hands of workers.

[0003] Such a plate discharging device is disclosed in Japanese Patent Publication No. Hei.
87 and JP-A-5-318903. The former publication discloses a device in which a leading portion of a used original plate is sucked by a suction arm, transported until it comes into contact with a plate discharging roll, and wound up by a rotating plate discharging roll. The latter publication discloses an apparatus in which a used original plate is peeled from a rear end portion of a plate cylinder, conveyed, and taken up by a rotating plate discharging roll.

[0004]

According to the apparatus disclosed in the above-mentioned publication, the leading portion of the used original plate is a portion which is clamped by a clamp for fixing the original plate to the plate cylinder. However, the original plate could not be securely adhered to the plate discharging roll. For this reason, when the original plate is wound on a plate discharging roll, there is a problem that the leading portion may be broken or wrinkled, resulting in poor winding. In addition, there is a problem in that the winding diameter is swelled due to wrinkles at the time of winding, and only a small amount can be wound with respect to an assumed winding amount.

According to the apparatus disclosed in the latter publication, the rear end of the used original plate has a small portion to which no ink adheres, so that the original plate can be adhered to the plate discharge roll. A mechanism for rotating the plate cylinder in a direction opposite to that during printing is required, and there has been a problem that the structure is complicated and expensive.

Further, according to both devices, the diameter of the plate discharge roll increases as the used plate is taken up, and it is necessary to provide a mechanism for absorbing the difference in peripheral speed between the plate discharge roll and the plate cylinder. There was a problem that it became expensive by this amount.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and provides a stencil printing machine having a simple configuration in which a used stencil can be reliably wound around a stencil discharge roll. The purpose is to:

[0008]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a plate discharging device of a stencil printing machine according to the present invention performs the following plate discharging operation. That is, the used stencil wound around the plate cylinder of the stencil printing machine is peeled off and conveyed by a predetermined amount, and the printing area subsequent to the stencil head is prevented while keeping the head of the stencil from contacting the stencil discharge roll. The leading end of the original is folded back onto the part following the leading part, which has already been wound around the plate discharging roll, while abutting on the plate discharging roll and winding up the further succeeding part of the original.

According to this operation, the used original plate can be securely adhered to the plate discharge roll by the adhesive force of the ink by pressing the printing area on which the ink has adhered to the plate discharge roll. In addition, the top part of the original plate to which ink has not adhered is folded over the printing area already wound around the plate discharging roll and pressed, so that it can be securely adhered with the ink that has leaked to the front side of the printing area. it can.

The stencil printing machine according to the present invention has the following configuration to achieve the above operation. That is, at a retracted position separated from the plate discharging roll and at a pressing position for pressing the original plate peeled off from the plate cylinder against the plate discharging roll, a pressing roller movable relative to the plate discharging roll, and at the retracted position. For the pressure roller, the original plate peeled off from the plate cylinder is transported such that the leading portion projects a predetermined amount, and the pressure roller at the pressing position is
A conveying device for guiding a subsequent portion of the original, a blocking member for preventing a leading portion of the original from directly contacting the discharge roll when the pressure roller moves from a retracted position to a pressing position, and A roll drive mechanism that is guided to the device and rotates and drives the plate discharge roll so as to wind up the plate pressed by the pressure roller at the pressing position, and the plate leading portion is wound on the plate discharge roll, And a folding roller for folding and pressing the original on the original following the leading portion. The amount of protrusion of the leading portion of the original plate is an amount sufficient for the printing area of the original plate to be pressed against the plate discharge roll by the pressure roller when the pressure roller moves to the pressing position.

[0011] Further, the conveying device may be a device for nipping the original plate between opposing belts stretched over a pair of conveying rollers and conveying the original, and the pressing roller may be one of the conveying rollers. A roller located on the side opposite to the plate discharge roll with respect to the original plate may be used. According to this configuration, by using one of the transport rollers as the pressure roller, the number of components can be reduced, and a simple configuration is achieved.

Further, the transport device may be integrally movable so that the pressure roller moves to the retracted position and the pressed position. According to this configuration, the positional relationship between the transport rollers on which the belt is stretched does not change, so that a configuration for using one of the transport rollers as the pressure roller can be realized more easily.

Further, the plate discharging roll can be driven by a pressure roller located at the pressing position. According to this, it is not necessary to newly provide a component for rotating and driving the plate discharging roll, and a simpler configuration can be achieved. Also, since the peripheral speed of the pressure roller, which is one of the transport rollers, and the peripheral speed of the plate discharging roller naturally match,
There is no need to provide a new mechanism for matching the two.

Further, the pressure roller may have gear-like teeth on at least a part of its surface. With these teeth, the rotation of the pressure roller can be reliably transmitted to the plate discharging roll.

According to another aspect of the present invention, there is provided a stencil printing machine plate discharging method, wherein the used stencil wound around the plate cylinder of the stencil printing machine is peeled off and transported by a predetermined amount. Pressing the printing area subsequent to the original plate leading portion against the plate discharging roll while not contacting the plate discharging roll, and winding the subsequent portion of the original plate pressed by the plate discharging roll,
Folding back onto a part subsequent to the head part, which has already been wound around the plate discharge roll, and pressure-bonding the part.

According to this method, the used original plate can be securely adhered to the plate discharge roll by the adhesive force of the ink by pressing the printing area to which the ink has adhered to the plate discharge roll. In addition, the top part of the original plate to which ink has not adhered is folded over the printing area already wound around the plate discharging roll and pressed, so that it can be securely adhered with the ink that has leaked to the front side of the printing area. it can.

Another stencil discharging device of the stencil printing machine according to the present invention is a stencil printing machine in which a used original plate wound around a plate cylinder is peeled off and wound around a stencil discharging roll. Transport means for peeling and transporting the used original plate, folding means for folding a leading portion of the transported original plate into a printing area subsequent to the leading portion, and winding the folded fold of the original plate around the plate discharging roll. Winding means.

According to this configuration, the head portion of the original to which no ink is attached is folded back to the subsequent printing region of the original plate, so that the head portion of the original is removed by the adhesive force of the ink attached to the printing region. Can be wound around.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment (hereinafter, referred to as an embodiment) of a plate discharging device and a plate discharging method for a stencil printing machine according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic configuration of the present embodiment. The plate cylinder 10 is formed by forming a porous material into a substantially cylindrical shape.
2, the ink is pushed out from the inside of the plate cylinder 10 toward the surface. The plate cylinder 10 is driven to rotate only in the direction of arrow A in the figure by a plate cylinder drive motor (not shown).
A perforated original plate 14 is wound around the surface of the plate cylinder 10 in accordance with the content of printing. At the time of printing, a leading portion 14a of the original plate 14 is held between the clamp pieces 16 and the clamp base 18. FIG. 1 shows a state in which the original piece 14 is released by opening the clamp piece 16. Original 1
FIG. 2 shows the pinched state of 4. The clamp piece 16 includes the leading portion 14a of the original and the spring 2
0 is clamped between the clamp base 18 and one end 20a. The raising spring 20 is wound around the rotating shaft 22 of the clamp piece 16 at the center thereof, one end 20a is clamped together with the original plate 14 as described above, and the other end 20b is fixed to the back surface of the clamp piece 16. Then, the clamp piece 16 rotates about the shaft 22, and the original head portion 14a
Is released, one end 20a of the raising spring separates from the clamp base 18 as shown in FIG. 3, and lifts the leading portion 14a of the original. The state shown in FIG. 1 is the state shown in detail in FIG. Further, since the clamp base 18 and the like are provided on the original plate leading portion 14a, ink does not adhere thereto.

A guide claw 24 is arranged near the clamp piece 16 and the clamp base 18. Guide claws 24
Is swingable between a position shown by a solid line and a position shown by a broken line in the figure. With this swing, the original head portion 14a is lifted and guided to a transport device described later.

The transport device 26 is driven by the guide claws 24
It is arranged at a position facing the lifted original plate leading portion 14a. As will be described in detail later, the entire device can be swung by a solenoid 28 between a position indicated by a solid line and a position indicated by a broken line in the figure. The transfer device 26 is the original 1
4 have transport belts 30 and 31 and transport rollers 32, 34, 36 and 38 for holding the transport belt 4 from the front and back. These transport belts 30 and 31 are transport rollers 3 located on the front side of the original.
2, 34, and transport rollers 36, 38 located on the back side of the original plate.
The original 14, which is wound around and conveyed to the transport rollers 32, 36, is also prevented. The transport roller 32 is driven by a transport motor 40, whereby the transport belt 30 rotates and the transport roller 34 also rotates. Further, the transport rollers 32 and 34 and the transport belt 31 on the back side of the original are also the transport belt 30 and the transport roller 3 on the front side.
Rotated by 2. Therefore, the guide claws 24
The original 14 guided to the transport device 26 is transported leftward in the figure by a transport roller 32 driven by a transport motor 40 and transport belts 30 and 31 driven by the transport roller 32. Further, the transport device 26 is provided with an original detection sensor 41 for detecting the leading end of the original 14 when the original 14 is transported. The original detection sensor 41 is configured by a photo sensor, and the light from the light emitting unit 41a
4 is detected by the light receiving unit 41b, and the leading end of the original plate 14 is detected.

At the lower left of the transport device 26 in the figure, a plate discharging roll 4 is provided.
2 is located. The plate discharge roll 42 is supported by the other end of a plate discharge roll support arm 44 whose one end is rotatably supported. The plate discharge roll support arm 44 is supported by a support spring 46 against the weight of the plate discharge roll 42, and presses the plate discharge roll 42 against a pressing roller 48 described later. The plate discharging roll 42 is formed by sequentially winding the used original plate 14 around the winding core 50, and the outer diameter gradually increases as the original plate 14 is wound. In order to cope with this change in outer diameter,
The characteristics of the support spring 46 are determined.

The pressing roller 48 is rotatably supported by a pressing roller frame 52 fixed to the apparatus.
As described above, it is always in contact with the outer periphery of the plate discharging roll 42. The transport device 26, the plate discharge roll 42, and the press roller 48 are housed in a plate discharge box 54, and have a structure in which other portions of the printing machine are not stained.

Next, the plate discharging operation of the used original plate 14 will be described step by step.

When the printing operation is completed, the plate cylinder 10 is rotated by a plate cylinder drive motor (not shown) to a position where the clamp table 18 is substantially opposed to the guide claw 24. Then, the clamp piece 16 is released, and the original head portion 14a is released and lifted as shown in FIG. 3 or FIG.

In FIG. 1, the master 14 whose top end is lifted by the movement of the guide claw 24 to the position shown by the broken line is fed in the direction of the conveying device 26 by the rotation of the plate cylinder 10. The original plate leading end 14a is fed between the two transport rollers 32 and 36, and is fed between the transport belts 30 and 31 by the rotating transport rollers 32 and 36. The plate cylinder 10, the transport rollers 32, and the transport belts 30, 31 further rotate, and send the original 14 further rightward. The rotation speeds of the respective drive motors are set so that the peripheral speeds of the plate cylinder 10 and the conveying roller 32 at this time are almost the same. The number of rotations is automatically determined when the diameters of the plate cylinder 10 and the transport roller 32 are determined, and therefore need not be changed unless the plate cylinder 10 is changed.

The original 14 to be transported is an original detection sensor 41.
The original 14 blocks the light from the light emitting portion 41a, and it is detected that the leading end of the original has passed the position where the original detection sensor 41 is arranged.

FIG. 4 shows a state in which a predetermined amount of the original has been sent after the leading end of the original has passed the position of the original detection sensor 41.
Is shown in As shown in the figure, since the transport device 26 is at the retracted position away from the plate discharge roll 42, the original 14
Is located at a position distant from the plate discharging roll 42, and the leading portion 14 a is located above the pressing roller frame 52.

When the original plate 14 is conveyed by a predetermined amount after the original plate detecting sensor 41 detects the leading end of the original plate, the solenoid 28 moves the conveying device 26 to the discharge roll 4 shown by a broken line in FIG.
Move to a position where it comes into contact with 2. The transport device 26 is configured to be movable around a rotation axis of the transport roller 32 to a position shown by a solid line and a position shown by a broken line in FIG. Contact the outer circumference of the plate discharging roll 42.

FIG. 5 shows a state in which the transport device 26 is in contact with the plate discharging roll 42. The transport roller 34 disposed on the front side of the original 14 and in front of the original feeding direction is
Is in contact with the plate discharge roll 42. Original version 1
The transport roller 38, which is arranged on the back side of 4 and in front of the original feeding direction, is previously arranged at a position where it does not come into contact with the plate discharge roll 42 in this state. In this state, the transport roller 34 presses the original 14 against the plate discharge roll 42 by the weight of the transport device 26. At this time, the transport device 26 is moved so that the printing area of the original plate 14 comes into contact with the plate discharging roll 42.
The transport amount of the original 14 until the is moved is set.
The ink extruded from the inside of the plate cylinder 10 adheres to the back surface of the printing area of the original plate.
The original 14 is pressed against the plate discharging roll 42 by the pressing force of the transport roller 34. Therefore, the transport rollers 34
Functions as a pressure roller that can be moved to a retracted position away from the plate discharging roll 42 and to a pressing position for pressing the original plate 14 against the plate discharging roll 42.

On the other hand, the original plate leading portion 14a conveyed above the pressing roller frame 52 moves downward as the above-described conveying device 26 moves.
2 does not come into contact with the plate discharging roll 42. Accordingly, the pressing roller frame 52 is provided with the original head 1
4a functions as a blocking member that prevents the plate 4a from directly contacting the plate discharge roll 42.

When the transport motor 40 is further rotated in this state, the transport roller (pressing roller) 34 is driven to rotate via the transport roller 32 and the transport belt 30, and the original 14
The plate discharging roll 42 is also driven to rotate via the. Therefore, the transport motor 40, the transport rollers 32 and 34, and the transport belt 30 function as a roll driving mechanism. Further, at this time, since the plate discharging roll 42 is driven by the transport roller 34, the peripheral speeds of the respective plates coincide without requiring a special device.

FIG. 6 shows a state in which the original plate 14 is further fed after the transport device 26 is brought into contact with the plate discharge roll 42 and partially wound around the plate discharge roll 42. The printing area of the original plate 14 adhered to the outer peripheral surface of the plate discharging roll 42 by the transport roller (pressure roller) 34 is wound up without being peeled off by the adhesive force of the ink. Then, the original head portion 14 whose contact has been prevented by the press roller frame 52.
Following this, a is drawn by the printing area of the original roll wound around the plate discharging roll 42 and is drawn between the press roller 48 and the plate discharging roll 42. And the original head 14
The “a” is folded back and pressed by the pressing roller 48 on the printing area of the subsequent original plate. Therefore,
The pressing roller 48 functions as a folding roller that folds and presses the top of the original onto the original following the top. In addition, at this time, the head portion of the original is securely adhered by the ink remaining on the surface of the printing area of the original.
Although the amount of ink remaining on the surface of the original plate is small, the ink is not dried since the leading portion of the original plate is folded back and adhered to the subsequent printed portion immediately after printing. Therefore, even if it is slight, the head portion is securely adhered by the adhesive force of the remaining ink. Thereafter, the transport motor 40
When the plate cylinder 10 rotates, the original 14 is sent, and when the plate discharging roll 42 rotates, the sent original 14 is taken up. Then, after the rear end of the original plate 14 is detected by the original plate detection sensor 41, a predetermined amount of conveyance is performed, and then the rotation of the conveyance motor 40 and the plate cylinder 10 is stopped. The detection of the trailing edge of the original is performed by detecting the light from the light emitting unit 41a, which is blocked by the original 14, by the light receiving unit 41b. The predetermined amount of the above-described conveyance is set in view of a slight margin in the conveyance amount from when the rear end passes the position of the original plate detection sensor 41 to when the rear end reaches the plate discharge roll 42. After the stop of the transport motor 40 and the like, the transport device 26 is moved to the retracted position by the solenoid 28, and the plate discharging operation ends.

FIG. 7 shows an example of the transport roller 34 which also serves as a pressure roller. Gear-shaped teeth are provided on the outer periphery of the outer end of the transport roller 34, so that the rotation of the transport roller 34 can be reliably transmitted to the plate discharge roll 42 even through the original 14.

As described above, in the present embodiment, the original printing portion 14a, which is not adhered to the plate discharging roll 42 because the ink has not adhered thereto, is folded over the succeeding printing region, so that the printing region is printed. The leading edge portion 14a of the original plate can be reliably adhered to the plate discharging roll 42 by the ink that has oozed out.

The conveyor belts 30, 3 of the conveyor 26
A simple structure can be achieved by using the transport roller 34 among the transport rollers 32, 34, 36, and 38 over which the original 1 is applied as a pressure roller that presses the original 14 against the plate discharging roll 42. That is, since a part of the transport device 26 is used as a pressure roller, the transport device 26 naturally moves following the movement of the pressure roller, and there is no need to provide a separate moving mechanism. Also, an increase in the number of rollers can be suppressed.

Further, by rotating and driving the plate discharge roll 42 by a transfer roller (pressing roller) 34 in contact with the plate discharge roll 42, the drive mechanism of the plate discharge roll 42 and the drive mechanism of the transfer device are shared, and a new drive is performed. There is no need to provide a mechanism. Also, with this configuration, the transport rollers 3
4 and the peripheral speed of the plate discharging roll 42 match, so that the original plate 14 does not wrinkle or break.

Further, since the gears are provided on the transport roller 34, the plate discharge roll 42 can be reliably driven to rotate without slipping.

In the present embodiment, the clamp piece 16 urged by the raising spring 20, the guide claw 24, the transport roller 32,
Each of the transfer devices 26 including the transfer belts 34, 36, and 38 and the transfer belts 30 and 31 functions as a part of a transfer unit that removes and transfers the used original plate wound around the plate cylinder. Further, the transfer device 2 which can be moved to the retreat position and the pressing position
6, the press roller frame 52, and the press roller 48 each function as a part of a fold unit that folds the original head to a print area subsequent to the head. Furthermore,
The transport motor 40 and the transport roller 3 for transmitting the driving force
Each of the press rollers 2 and 34 and the pressing roller 48 functions as a part of a winding unit that winds the fold of the folded original plate around the plate discharge roll.

The printing area of the original used in the present specification is an area of the original where the ink has permeated on the surface.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of a plate discharging device of a stencil printing machine according to the present invention.

FIG. 2 is a view showing details of a clamp unit of the present embodiment, particularly showing a state where an original plate is held.

FIG. 3 is a view showing details of a clamp unit of the present embodiment, particularly showing a state when an original is released.

FIG. 4 is an operation explanatory diagram of the present embodiment.

FIG. 5 is an operation explanatory diagram of the present embodiment.

FIG. 6 is an operation explanatory diagram of the present embodiment.

FIG. 7 is a detailed view of a transport roller that is also used as a pressure roller of the present embodiment.

[Explanation of symbols]

10 plate cylinder, 14 original plate, 14a Original head, 16
Clamp piece, 18 clamp base, 20 spring, 2
4 Guide claw, 26 transport device, 30, 31 transport belt, 32, 36, 38 transport roller, 34 transport roller (pressure roller), 40 transport motor, 41 original plate detection sensor, 42 plate discharge roll, 48 press roller (return roller) 52, holding roller frame (blocking member).

Claims (7)

[Claims] 1. A plate discharging device for removing a used original plate wound around a plate cylinder of a stencil printing machine and winding the plate around a plate discharging roll, wherein a retracted position away from the plate discharging roll and a plate removing device separated from the plate cylinder. At a pressing position where the original plate is pressed against the plate discharging roll,
A pressure roller that is relatively movable with respect to the plate discharge roll, and a pressure roller that is at the retracted position, and transports the original peeled from the plate cylinder so that the leading end thereof projects a predetermined amount, and presses the plate. A conveying device for guiding a subsequent portion of the original to the pressure roller at the position, and when the pressure roller moves from the retracted position to the pressing position, the leading portion of the original directly contacts the plate discharge roll. A blocking member for blocking, a roll driving mechanism for rotating the plate discharge roll to wind up the plate pressed by the pressure roller at the pressing position and guided by the transport device, and Rolled up,
A folding roller that folds and presses on the original following the leading part, and the amount of protrusion of the leading part of the original is determined by a printing area of the original when the pressing roller moves to a pressing position. Is a sufficient amount to be pressed against the stencil roll by the pressure roller. 2. The stencil printing machine according to claim 1, wherein the transport device holds the original plate between opposed belts which are wound around a pair of transport rollers. It is a device that transports, the pressure roller is a roller of the transport roller is located on the opposite side of the plate discharge roll with respect to the original plate,
A plate discharging device for a stencil printing machine. 3. The stencil printing machine according to claim 2, further comprising a transport device drive mechanism for integrally moving the transport device so that the pressure roller moves to a retracted position and a pressed position. A plate discharging device for a stencil printing machine. 4. The stencil printing machine according to claim 2, wherein the stencil roll is driven by a pressure roller at the pressing position. 5. The stencil printing machine according to claim 4, wherein the pressure roller has gear-shaped teeth on at least a part of its surface. 6. A plate discharging method in which a used original plate wound around a plate cylinder of a stencil printing machine is peeled off and wound around a plate discharging roll, wherein the used original plate wound around a plate cylinder of the stencil printing machine is peeled off. Transporting the original by a predetermined amount; contacting a printing area subsequent to the original head with a discharging roll while preventing the leading end of the original from contacting the discharge roll; further following part of the original Wrapping the stencil and winding back the original stencil onto the part subsequent to the stencil already wound around the stencil discharge roll and pressure-bonding the stencil. 7. A plate discharging device for peeling a used plate wound around a plate cylinder of a stencil printing machine and winding it around a plate discharging roll, wherein the plate is used to peel off a used plate wound around a plate cylinder of the stencil printing machine. Transport means for transporting the original by transporting the original, a folding means for folding a leading portion of the transported original into a printing area subsequent to the leading portion, and a winding means for winding the folded fold of the original on the plate discharging roll. Stencil printing machine having a stencil printing machine.