JP4344150B2 - Plate making equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a stencil printing apparatus that performs printing by winding a master that has been made, and more particularly to a plate making apparatus that makes a master.
[0002]
[Prior art]
Conventionally, digital thermal stencil printing is known as a simple printing method. This is because a thermal head in which a plurality of heating elements are arranged in a row is brought into contact with a master having a structure in which a thermoplastic resin film and a porous support are bonded, and each heating element is energized in a pulsed manner. After the master is transported by a transporting means such as a platen roller, a perforated image based on the image information is heat-melted perforated and engraved on the thermoplastic resin film of the master, and then the perforated master is removed from the porous cylindrical plate cylinder. The image is obtained by transferring the ink oozed from the plate cylinder opening part and the master punching part to the paper by pressing the paper against the outer peripheral surface of the plate cylinder by pressing means such as a press roller. .
[0003]
A sheet-like master is generally used in this stencil printing, and is stored in a roll state inside the printing apparatus. The master in the roll state is made while being drawn out by the conveying means as described above at the time of making the plate, and is wound on the outer peripheral surface of the plate cylinder after being cut by the cutting means every one plate. An example of this cutting means is described in, for example, “Patent Document 1”.
[0004]
[Patent Document 1]
JP 2000-6510 A (Page 5-6, Fig. 3-5)
[0005]
[Problems to be solved by the invention]
In such a cutting means, an initializing operation for positioning the cutting means to the initial position is performed at the start of the plate making operation in order to reliably cut the master in the plate making operation. However, at the time of this initialization operation, if the leading end of the master pulled out from the master roll is located downstream of the master cutting position by the cutting means in the master transport direction, the master is cut by the initialization operation. When the cutting means is not located at the initial position, if the above operation such as cover open or master cut jam occurs during the master cutting by the cutting means, or if the cutting means is reciprocating, it is cut by vibration etc. The case where the means moves slightly and the sensor for detecting the initial position cannot detect the cutting means, etc. The master cut in this way becomes a short strip, and if left as it is, it will cause a master transport jam or stick to other places inside the device and cause malfunctions. There is a problem that this removal work is very troublesome.
[0006]
SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems and to provide a plate making apparatus capable of performing an initializing operation of a cutting means without causing a waste of a master or a decrease in workability.
[0007]
[Means for Solving the Problems]
The invention according to claim 1 is a plate making apparatus comprising a platen roller that conveys a master fed from a master roll, a thermal head that punches and makes the master, and a cutting means that cuts the master. A master front end that is capable of transporting the master in a forward direction sent out from the master roll and a reverse direction returned to the master roll, and that detects whether or not the front end of the master is beyond the cutting position by the cutting means. Having a detecting means, and when the master leading edge detecting means detects that the leading edge of the master is beyond the cutting position at the start of plate making operation, the platen roller is operated to The cutting means is initialized in a state in which it is conveyed in the reverse direction and the tip of the master does not exceed the cutting position. And performing.
[0008]
According to a second aspect of the present invention, in the plate making apparatus according to the first aspect of the present invention, a reverse conveying means capable of conveying the master only in the reverse direction between the master roll and the platen roller is further provided with the platen roller and the platen roller. It is characterized by having a normal conveying means capable of conveying the master only in the positive direction between the cutting means.
[0009]
The invention according to claim 3 is the plate making apparatus according to claim 2, wherein both the reverse conveying means and the conveying speed of the forward conveying means are set faster than the conveying speed of the platen roller. To do.
[0010]
According to a fourth aspect of the present invention, in the plate making apparatus according to any one of the first to third aspects, the reverse conveying means and the normal conveying means are both roller pairs. .
[0011]
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 cutting means further reciprocates in the width direction of the master from an initial position. It is characterized by cutting.
[0012]
According to a sixth aspect of the present invention, in the plate making apparatus according to the fifth aspect, the cutting means further includes a cutter member having a pair of rotary blades whose peripheral edges overlap each other and are rotatable in opposite directions, and the cutter member. And a rotational movement means for rotationally driving the pair of rotary blades while reciprocating from the initial position in the width direction of the master.
[0013]
A seventh aspect of the present invention is a stencil printing apparatus comprising the plate making apparatus according to any one of the first to sixth aspects.
[0014]
【Example】
FIG. 1 shows a plate making apparatus of a stencil printing apparatus adopting a first embodiment of the present invention. In the figure, a plate making apparatus 1 has a platen roller 2, a thermal head 3, a cutting means 4, a master tip detection sensor 5 as a master tip detection means, a master transport roller pair 6 as a master transport means, a master guide plate 7, and the like. is doing.
[0015]
The platen roller 2 is rotatably supported on a side plate (not shown) of the plate making apparatus 1, and pulls out and transports the master 8 from a master roll 8 a that is rotatably and detachably supported by a master storage means (not shown). The platen roller 2 is rotationally driven by a stepping motor 9 disposed in the plate making apparatus 1 and capable of forward and reverse rotation, and is a direction in which the master 8 is fed from the master roll 8a. Is rotated in the reverse direction indicated by the arrow B in FIG.
[0016]
The thermal head 3 has a plurality of heating elements (not shown) on the upper surface, and each heating element selectively generates heat based on a command from a thermal head driver (not shown), so that the thermoplastic resin film and the porous support are formed. The thermoplastic resin film of the master 8 formed by bonding together is heated, melted and punched. The thermal head 3 is supported by an elevating means (not shown) provided in the plate making apparatus 1 so as to be lifted and lowered. The plate making position where the platen roller 2 shown in FIG. 1 is pressed with a predetermined pressure contact force is shown in FIG. It selectively occupies a retracted position separated from the platen roller 2 indicated by a chain line.
[0017]
The cutting means 4 is the same as that disclosed in Japanese Patent Application Laid-Open No. 2000-6510, and a pair of rotating blades 4a and 4b that are partially overlapped with each other and are rotatable in opposite directions, and each rotating blade 4a. 4b, and a rotating member 4d for rotating the rotary blades 4a and 4b while reciprocating the cutter member 4c in the width direction of the master 8. In the vicinity of the cutter member 4c, a home position sensor 4e for detecting when the cutter member 4c is located at the home position as the initial position outside the master width direction of the conveyance path of the master 8 is integrated with the cutting means 4. Is provided.
[0018]
The master tip detection sensor 5 made up of a reflective sensor is provided on a side plate (not shown) of the plate making apparatus 1 located above the transport path of the master 8. The master tip detection sensor 5 detects the tip of the master 8 from the difference in reflectance, and outputs a signal to a control means (not shown) when the tip of the master 8 is detected. The master tip detection sensor 5 detects this when the tip of the master 8 is pulled out from the master roll 8 a and reaches the cutting position by the cutting means 4.
[0019]
A master transport roller pair 6 and a master guide plate 7 are disposed downstream of the cutting means 4 in the master transport direction. The master conveying roller pair 6 includes a driving roller 6a and a driven roller 6b that are rotatably supported on a side plate (not shown) of the plate making apparatus 1, and the driving roller 6a is driven in the direction of the arrow in FIG. The driven roller 6b is brought into pressure contact with the peripheral surface of the drive roller 6a with a predetermined pressing force by a biasing means (not shown). A master guide plate 7 for guiding the master 8 made to the plate to a plate cylinder 10 to be described later is fixed to a side plate (not shown) of the plate making apparatus 1.
[0020]
In the master conveyance path located between the master roll 8a and the platen roller 2 and the thermal head 3, between the platen roller 2 and the thermal head 3 and the cutting means 4, and between the cutting means 4 and the master conveyance roller pair 6. Are provided with guide plates (not shown) for assisting the conveyance of the master 8.
[0021]
A plate cylinder 10 constituting the stencil printing apparatus 11 is disposed on the left side of the master guide plate 7. A plate cylinder 10 that is rotationally driven by a plate cylinder driving means (not shown) has a porous support plate 10a having a plurality of apertures 10b on the outer peripheral surface, and an ink supply means (not shown) inside. Have. A press roller (not shown) is provided below the plate cylinder 10 and a paper feeder (not shown) is provided below the plate making apparatus 1, and the master 8 made by the plate making apparatus 1 is an outer periphery of the plate cylinder 10. After being wound on the surface, the paper is fed from the paper feeder toward the plate cylinder 10 and the press roller, and the paper is pressed against the plate cylinder 10 by the press roller. Printing is performed by transferring the ink supplied from the inside to the paper through the opening 10 b and the punching portion of the master 8.
[0022]
Based on the above-described configuration, the operation of the plate making apparatus 1 will be described below.
[0023]
When an operator presses a plate making start key on an operation panel (not shown), the cutting means 4 is initialized. Prior to this initialization operation, the control means (not shown) recognizes the signal from the master tip detection sensor 5 and when the signal from the master tip detection sensor 5 is not input, the control means moves the platen roller 2 in the forward direction A. The tip of the master 8 is conveyed in the positive direction A. The front end of the conveyed master 8 is eventually detected by the master front end detection sensor 5, but the master 8 is further transported by a predetermined amount thereafter, and the front end occupies the position shown in FIG. When the front end of the master 8 is not detected by the master front end detection sensor 5 during the transport in the positive direction A, it is determined that a master transport jam has occurred, and the plate making operation is stopped. If the signal from the master tip detection sensor 5 is output to the control means (not shown) at the start of the operation, the above operation is omitted.
[0024]
When the tip of the master 8 occupies the position shown in FIG. 2, the lifting / lowering means (not shown) operates to position the thermal head 3 at the plate making position. Next, the platen roller 2 is rotationally driven in the reverse direction B, and the master 8 is conveyed in the reverse direction B. Then, when the tip of the master 8 passes below the master tip detection sensor 5 as shown in FIG. 3 and the tip of the master 8 is no longer detected by the master tip detection sensor 5, the rotation of the platen roller 2 is stopped.
[0025]
After the tip of the master 8 occupies the position shown in FIG. 3, when the home position sensor 4e does not detect the home position of the cutter member 4c, the rotational movement means 4d is driven and the cutting means 4 is initialized. Done. At this time, the tip of the master 8 is conveyed in the reverse direction B from the cutting position by the cutting means 4 detected by the master tip detection sensor 5, so that the tip of the master 8 is prevented from being cut by the cutting means 4. Is done.
[0026]
When the cutter member 4c is positioned at the home position by the initialization operation, and a signal from the home position sensor 4e is input to a control means (not shown), the platen roller 2 is rotationally driven in the forward direction A, and the master 8 is moved in the forward direction A. It is conveyed toward. When the leading end of the master 8 reaches the cutting position detected by the master leading end detection sensor 5, the rotation of the platen roller 2 is stopped and the leading end positioning of the master 8 is completed.
[0027]
With the above-described configuration, the home position positioning operation of the cutting unit 4 is performed in a state where the leading end of the master 8 is not positioned at the cutting position by the cutting unit 4. 4 can be reliably prevented from being cut, and the master 8 can be prevented from being short strip-shaped and causing various problems, and the removal of the master by the operator can be eliminated to improve work efficiency. it can.
[0028]
FIG. 4 shows a second embodiment of the present invention. Compared with the first embodiment described above, the second embodiment includes a back tension roller pair 12 as a reverse conveying means between the master roll 8a, the platen roller 2 and the thermal head 3, and the platen roller 2 and The only difference is that a front tension roller pair 13 serving as a normal conveying means is disposed between the thermal head 3 and the cutting means 4, and the other configurations are the same.
[0029]
The back tension roller pair 12 includes a driving roller 12a and a driven roller 12b that are rotatably supported by a side plate (not shown) of the plate making apparatus 1. The drive roller 12a has a one-way clutch (not shown) inside, and is driven to rotate only in the direction of the arrow in FIG. 1, which is a direction for returning the master 8 to the master roll 8a by a drive means (not shown). The peripheral surface of the driven roller 12b is pressed against the peripheral surface of the driving roller 12a by a predetermined pressing force by an urging means (not shown). The rotational circumferential speed of the drive roller 12a is set so that the master conveyance speed of the back tension roller pair 12 is slightly higher than the master conveyance speed in the reverse direction B of the platen roller 2.
[0030]
Similarly to the back tension roller pair 12, the front tension roller pair 13 has a driving roller 13 a and a driven roller 13 b that are rotatably supported on a side plate (not shown) of the plate making apparatus 1. The drive roller 13a has a one-way clutch (not shown) inside, and is driven to rotate only in the direction of the arrow in FIG. 1, which is the direction in which the master 8 is fed from the master roll 8a by a drive means (not shown). The peripheral surface of the driven roller 13b is pressed against the peripheral surface of the driving roller 13a by a predetermined pressing force by a biasing means (not shown). The rotational circumferential speed of the driving roller 13a is also set so that the master tension speed of the front tension roller pair 13 is slightly higher than the master speed of the platen roller 2 in the positive direction A.
[0031]
Between the master roll 8a and the back tension roller pair 12, between the back tension roller pair 12, the platen roller 2 and the thermal head 3, between the platen roller 2 and the thermal head and the front tension roller pair 13, and the front tension roller. Guide plates (not shown) for assisting the conveyance of the master 8 are arranged on the master conveyance path located between the pair 13 and the cutting means 4.
[0032]
Based on the above configuration, the operation of the second embodiment will be described below.
When an operator presses a plate making start key on an operation panel (not shown), the cutting means 4 is initialized as in the first embodiment. The control means (not shown) rotates the platen roller 2 and the driving roller 13a in the forward direction A when the signal from the master tip detection sensor 5 is not inputted, and conveys the tip of the master 8 to the position shown in FIG. When the front end of the master 8 is not detected by the master front end detection sensor 5 during transport in the positive direction A, it is determined that a master transport jam has occurred, and the plate making operation is stopped. If the signal from the master tip detection sensor 5 is output to the control means (not shown) at the start of the operation, the above operation is omitted.
[0033]
When the tip of the master 8 occupies the position shown in FIG. 2, the lifting / lowering means (not shown) operates to position the thermal head 3 at the plate making position. Next, the platen roller 2 and the driving roller 12a are rotationally driven in the reverse direction B, and the master 8 is conveyed in the reverse direction B. During this conveyance, a peripheral speed difference is generated between the back tension roller pair 12 and the platen roller 2, so that tension is applied to the master 8 during this time, and the wrinkles and twists are returned. And if the front-end | tip of the master 8 occupies the position shown in FIG. 3, rotation of the platen roller 2 and the drive roller 12a will be stopped. After the tip of the master 8 occupies the position shown in FIG. 3, when the home position sensor 4e does not detect the home position of the cutter member 4c, the rotational movement means 4d is driven and the cutting means 4 is initialized. Done.
[0034]
When a signal from the home position sensor 4e is input to a control means (not shown), the platen roller 2 and the driving roller 13a are rotationally driven in the positive direction A, and the master 8 is conveyed in the positive direction A. During this conveyance, a peripheral speed difference is generated between the front tension roller pair 13 and the platen roller 2, so that tension is applied to the master 8 during this time, and the wrinkles and twists are returned. When the leading end of the master 8 reaches the cutting position detected by the master leading end detection sensor 5, the rotation of the platen roller 2 and the driving roller 13a is stopped and the leading end positioning of the master 8 is completed.
[0035]
With the above-described configuration, wrinkles and more of the master 8 on the upstream side and the downstream side in the master transport direction of the platen roller 2 can be completely removed in addition to the operational effects of the first embodiment. Good plate making can be performed during plate making operation.
[0036]
In the above embodiment, the cutting means 4 having the cutter member 4c having the pair of rotary blades 4a and 4b and the rotational movement means 4d is used as the cutting means, but the cutting means is not limited to this, and is fixed to the movable upper blade. A movable upper blade that reciprocates vertically with respect to the fixed lower blade, and a movable upper blade that is a master with respect to the fixed lower blade. With a movable upper blade and a fixed lower blade, and the movable upper blade reciprocates while rotating in the width direction of the master with respect to the fixed lower blade, only the movable upper blade You may use what has and moves while rotating in the width direction of a master.
[0037]
【The invention's effect】
According to the present invention, since the initializing operation of the cutting means is performed in a state where the leading end of the master is not positioned at the cutting position by the cutting means, it is ensured that the leading end of the master is cut by the cutting means during this operation. Thus, it is possible to prevent the master from becoming short strips and cause various problems, and it is possible to eliminate the master removal work by the operator and improve the work efficiency.
[0038]
In addition, a reverse conveying means capable of conveying the master only in the reverse direction is provided between the master roll and the platen roller, and a normal conveying means capable of conveying the master only in the positive direction is provided between the platen roller and the cutting means. Thus, the wrinkles and twists of the master on the upstream side and the downstream side of the platen roller in the master conveyance direction can be completely removed, and good plate making can be performed in the subsequent plate making operation.
[Brief description of the drawings]
FIG. 1 is a schematic front view of a plate making apparatus employing a first embodiment of the present invention.
FIG. 2 is a schematic diagram showing the position of the leading end of the master during forward conveyance in the first and second embodiments of the present invention.
FIG. 3 is a schematic diagram showing a master tip position at the time of reverse conveyance in the first and second embodiments of the present invention.
FIG. 4 is a schematic front view of a plate making apparatus adopting a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Plate making apparatus 2 Platen roller 3 Thermal head 4 Cutting means 4a, 4b Rotary blade 4c Cutter member 4d Rotation movement means 5 Master tip detection means (master tip detection sensor)
8 Master 8a Master roll 11 Stencil printing device 12 Reverse conveying means (back tension roller pair)
13 Forward conveying means (front tension roller pair)
A Forward direction B Reverse direction

Claims (7)

In a plate making apparatus having a platen roller for conveying a master fed out from a master roll, a thermal head for punching and making the master, and a cutting means for cutting the master,
The platen roller is capable of transporting the master in the forward direction fed out from the master roll and in the reverse direction returning to the master roll,
Master tip detection means for detecting whether or not the tip of the master is at a position beyond the cutting position by the cutting means,
When the master leading edge detection unit detects that the leading edge of the master is beyond the cutting position at the start of plate making operation, the platen roller is operated to transport the master in the reverse direction. The plate making apparatus performs an initialization operation of the cutting means in a state where the tip of the master does not exceed the cutting position. The plate making apparatus according to claim 1,
A reverse conveying unit capable of conveying the master only in the reverse direction between the master roll and the platen roller, and a normal conveying unit capable of conveying the master only in the forward direction between the platen roller and the cutting unit. A plate making apparatus having a conveying means. In the plate making apparatus according to claim 2,
The plate making apparatus is characterized in that the conveying speeds of the reverse conveying means and the normal conveying means are both set higher than the conveying speed of the platen roller. In the plate making apparatus according to any one of claims 1 to 3,
The plate making apparatus, wherein the reverse conveying means and the normal conveying means are both roller pairs. In the plate making apparatus according to any one of claims 1 to 4,
The plate making apparatus characterized in that the cutting means reciprocates in the width direction of the master from an initial position to cut the master. In the plate making apparatus according to claim 5,
The cutting means includes a cutter member having a pair of rotary blades whose peripheral edges overlap each other and are rotatable in opposite directions, and the pair of rotary blades while reciprocating the cutter member from the initial position in the width direction of the master. A plate making apparatus, comprising: a rotary moving means for rotating each of the plates. A stencil printing apparatus comprising the plate making apparatus according to any one of claims 1 to 6.

Images