JPS6317092A - Thermal screen printing stencil - Google Patents

Abstract

PURPOSE:To enhance the accuracy of a cutting dimension, by providing mount holes to a stencil along the extending direction thereof so as to provide an interval substantially necessary for one plate making and mounting a means displaying a cutting timing. CONSTITUTION:When the side end edge part of a stencil 3a on the downstream side thereof advances to the grasping position of a clamper 37 preliminarily held in an open state, both feed roller pairs 23, 24 and 24, 26 are stopped. Thereafter, by revolving a revolving cam 39, the mount holes 67 ... of the stencil 3a are engaged with stencil holding pins 66 and the side end edge part of said stencil 3a on the downstream side thereof is grasped by the clamper 37 and, when a plate cylinder 34 makes one revolution at a low speed in a clockwise direction, the stencil 3a after plate making stored in a storage chamber 28 is drawn out to be wound around the plate cylinder 34. When a cutting timing mark 68 arrives at the position detected by second photocouplers 27, 27, the operation signals for cutters 30, 31 are outputted from the second photocouplers 27, 27.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a band-shaped heat-sensitive stencil paper (hereinafter simply referred to as "base paper") that is cut and installed in a printing machine.

(b) Prior Art Conventionally, heat-sensitive stencil paper that is wound into a roll in the form of a band does not have a mounting hole that can engage with a stencil holding pin embedded in the plate cylinder of a printing press.

was not installed, and was only attached to printing machines equipped with glue ramps for clamping the edges of the base paper.

Therefore, even printing machines in which only the base paper holding bin is installed on the plate cylinder are equipped with a cutting mechanism for cutting the base paper and a punching mechanism for creating attachment holes in order to load the roll-shaped base paper. A plate-making device has been proposed (Japanese Patent Application Laid-open No. 1983-
(See Publication No. 14955).

The plate-making apparatus described in the above publication transports the base paper wound into a roll using a pair of feed rollers, and this feed 9
The transfer dimension of the 0-ra is detected, and when the paper has been transferred by a predetermined distance, a punching mechanism is operated to open a mounting hole in the base paper and cut it into a predetermined size.

(c) Problems to be Solved by the Invention As mentioned above, in the conventional technology, the base paper is not equipped with a means for displaying attachment holes or cutting timing. This was left entirely to the transport dimensions of the base paper.

Therefore, there is no problem as long as the base paper is accurately transferred by a predetermined dimension, but generally there is some slippage between the roller pair and the base paper, making it difficult to accurately transfer the predetermined dimension. There is a possibility that variations may occur in the opening positions and cutting positions of the mounting holes.

The present invention has been made in view of the problems associated with the conventional technology, and it is possible to accurately open mounting holes in the base paper by industrial means and to provide a means for indicating the cutting timing in advance, so that a plate-making device can cut the mounting holes. The purpose of this invention is to eliminate the need for drilling work for mounting holes, and to accurately cut to a predetermined length.

B.) Means for Solving the Problems The present invention provides an arrangement in which the mounting holes for the printing press intersect with the extending direction, with an interval substantially required for one plate-making process along the extending direction. A plurality of cutters are arranged in the direction of the extension, and means for displaying the cutting timing when cutting in the direction substantially perpendicular to the extending direction near the mounting hole is provided. It is a heat-sensitive stencil paper.

(E) Function In the present invention, the mounting holes are opened along the extending direction of the base paper at intervals substantially necessary for one plate-making process, and
Since it is equipped with a means to display the cutting timing,
By detecting this cutting timing, the material is accurately cut to a predetermined size.

(F) Embodiment Figure 1 is a plan view showing an embodiment of the base paper of the present invention, Figures 2 to 4 show a plate-making printing machine to which the base paper of the present invention is installed, and Figure 2 is an external perspective view. , FIG. 3 is a block diagram showing the outline of the internal structure, and FIG. 4 is a time chart for explaining the operation.

In FIG. 1, (3) is a strip-shaped base paper to which a heat-sensitive film (e.g., polyester film) and porous thin paper (e.g., polypropylene fine denier paper) are attached. plate cylinder (34
) are arranged in a direction substantially perpendicular to the extending direction thereof. ) is a rectangular through hole (cutting timing mark) as a means for displaying the cutting timing, and the through hole (68) is detected by the photocouplers (27) (27) provided in the plate making printing machine. The cutters (30) and (31) of the base paper (3) are configured to operate.

Note that the cutting timing mark (68) is located in the mounting hole (
67) may also be used.

In addition, (69) is a long hole for detecting the front and back sides of the base paper (3) after being cut, and is a long hole for detecting the front and back sides of the base paper (3) after being cut.
) is installed in a separate printing machine, it is used to determine whether the front and back sides are in the correct state.

Next, the structure and operation of the plate-making printing machine to which the base paper (3) is mounted will be explained with reference to FIGS. 1 to 4.

In Figures 2 and 3, the main body of the plate-making printing press (1) (
Hereinafter, it will simply be referred to as the main body. ) is equipped with an auxiliary document placement stand (2) at the upper left end. This document placement auxiliary table (2)
is rotatably attached to the main body (1), and is configured to extend horizontally only when necessary, and hang down when not needed. Inside the part where the document placement auxiliary table (2) is attached, there is a roll of original paper (3).
is rotatably fitted onto the support shaft (4). A tension roller (5) having rotational resistance and a tension roller (5) are pressed onto the upper part of the roll-shaped base paper (3) to apply tension to the base paper (3) when the base paper (3) is conveyed. A guide (6) is provided.

On the downstream side along the conveyance direction of the roll-shaped base paper (3), there is a plate-making machine (7) for forming a document image on the base paper (3).
is located next to it. This plate-making machine (7) mainly consists of a holding member (8) attached to the top surface of the main body (1) so as to be openable and closable, and a base paper ( 3) and the original (9) with the holding member (8).
A transparent glass plate (11) as a translucent member is pressed from below to a suppressed plate (10) which is attached to the lower surface and has elasticity.
), a flash lamp (12) as a light emitting means installed below this transparent glass plate (11), a transparent glass plate (11), and a flash lamp (12) are raised together, and this transparent glass plate (11) is raised. ) to the pressed plate (10
) and a pressurizing device 09). The holding member (8) is attached to the main body (1) via a hinge (13) (13) provided on the rear side edge (see Fig. 2). 8)
As mentioned above, there is a pressed plate (
lO) is fixedly installed, and this holding member (
A locking means (14) (14) is attached for locking the main body (1) when the main body (1) is closed. Further, a backup roller (15) is rotatably attached to the back surface of the holding member (8) to press both the original document (9) and the base paper (3) onto the upper surface of the guide (6). On the downstream side, there is a flash timing mark (16) provided on the base paper (3).
A first photocoupler (17) (17) for detecting (see Fig. 1) is arranged adjacent to the first photocoupler (17).

The glass plate (11) and the flash lamp (12)
is fixed to a chassis (18) having a U-shaped cross section, and as described above, this chassis (18) is configured to be movable up and down by a pressurizing device (19) provided at its lower part. A small lamp C20) for displaying the position of the original is installed in the bottom of the downstream side of the chassis (18), and the light emitted from this small lamp (20) is emitted from the chassis (18). ) and the outside of the reflector (21) of the flash lamp (12);
The transparent glass plate (11) is irradiated linearly. The downstream edge of the plate-making area is displayed by the light beam emitted from this small lamp (20). Since this display light beam can also pass through the original (9), it is also possible to control the plate-making position while the original (9) is placed on the transparent glass plate (11).

Further, a guide (22) for discharging the original is formed at the downstream end edge of the holding member (8).

On the downstream side of the plate-making machine (7), there is a paper (3a) of the plate-making machine that has been peeled off from the original (9) (hereinafter, the base paper after plate-making is 3).
Displayed at a. ), a first pair of conveying rollers (23) (24) and a second pair of conveying rollers (25) (26), which are in pressure contact with each other, are arranged in series. A driving force is applied to the second transport roller pair (25) (26) only when transporting the base paper (3a) by itself, and when the base paper (3a) is driven by other means. , a one-sided clutch that is driven with a certain resistance is attached to its rotating shaft. Below the first pair of transport rollers (23) and (24), there is a plate making plate on which an original image is formed. A storage chamber (28) is provided for temporarily storing the subsequent base paper (3a), and the upper edge is used as a fulcrum for discharging the original (9) separated from the base paper (3a). Guide (29) that can be rotated as
is installed.

A second photo coupler (27) (27) for detecting the cutting timing mark (68) of the base paper (3a) is provided near the two pairs of second transport rows (25) (26). A cutter consisting of a rotary blade (30)' and a fixed blade (31) for cutting the base paper (3a) is provided on the downstream side. and the second photocoupler (27
) The rotary blade (30) is rotated by the output signal from (27), and the base paper (3a) is subjected to shearing stress by the light from these double-edged blades, and is mechanically cut into a desired length dimension.

At the upper part of the cutters (30) and (31), there is an insertion guide (32) for inserting the base paper (3) which has been cut to a certain size in advance and made by another plate making machine from the outside of the main body (1), as will be described later. It extends towards the printing press (33).

A printing machine (3) is installed downstream of the cutters (30) and (31).
3), and this printing machine (33) is composed of a single plate cylinder (34), a press roller (36) that presses the printing paper (35) against this plate cylinder (34), etc. ing. In the non-printing area of the plate cylinder (34), a clamper (37) that holds the downstream edge of the base paper (3a), a base paper holder that engages with the attachment hole (67) of the base paper (3a), etc. Pin (66)
and a printing ink inlet (38). An over-center spring (not shown) is attached to the clamper (37), and this clamper (37) is attached to the main body (1).
), the base paper (3a) is held in place by the elastic force of the over-center spring, and
Further, it is configured to be released to air by a plate discharging machine (40) which will be described later. The structure of the plate cylinder (34) itself is conventionally known. Note that the clamper (37) is not necessarily required.

On the right side of the plate cylinder (34), the clamper (37) is released and the base paper (3b) (hereinafter referred to as
The base paper after printing is completed is displayed at 3b. ) to the plate cylinder (34
) is provided with a plate removal machine (40) for removing the plate from the plate. This plate discharge machine (40) includes a means (not shown) for opening the clamper (37) and a plate cylinder (34) for moving the base paper (3b).
) and the peeling claw (41) that peels off the peeled base paper (3
b) into the base paper storage box (42), a pair of meshing gears (43) (44), and a pair of gears (44) that store the base paper storage box (42)
2) is attached to the main body (1) in a horizontally removable manner. At the lower right side of the main body (1), there is paper (35) before printing.
A conventionally well-known paper feed tray (45) and paper feed roller (46) capable of loading up to about 1000 sheets are provided, and the plate cylinder (34) and press roller (36) are sequentially loaded from the top paper (35). ). In addition, the main body (1
) is provided with a conveyor (47) for conveying the printed paper (35) and a paper discharge tray (48) for stacking and storing the discharged paper (35). (49) is a motor that drives the plate cylinder (34) and the like.

This plate-making printing machine is sequence-controlled by a microcomputer, and the plate-making machine (7) and printing machine (33)
In addition, as mentioned above, when forming an original image on the roll-shaped base paper (3), the original image (the first Flash timing marks (16), . . . are attached at intervals corresponding to the length of the area). The flash timing mark (16)... and the cutting timing mark (68) are printed on the base paper (3) in advance, but they are displayed through holes, and these holes are opened using a micro switch. It may also be detected. It can also be formed by pasting small pieces of aluminum foil that reflect light.

Next, the operation of the present plate making printing machine will be explained. Note that FIG. 3 shows the state at time P in FIG. 4 (time chart). The base paper (3) is pulled out from the roll in advance and held between the first pair of conveyance rollers (23) (24) and the second pair of conveyance rollers (25) (26), and the downstream edge thereof is located between the cutter blades (30) and (31). At this time, the upstream side of the base paper (3) is stretched over the transparent glass plate (11) with the heat-sensitive film surface facing upward. (8) with the hinge (13) as the center of rotation (see Figure 2), and place the manuscript (9) on the base paper (3) with the plate-making side facing down. 0 At this time, the downstream edge of the plate-making area is displayed on the transparent glass plate (11) using light rays as described above. Note that marks (A4, B4) indicating the width direction dimensions are formed on the upper surface of the guide (6) provided on the upstream side of this transparent glass plate (11) (see Fig. 2). Therefore, the operator only has to position the part of the original (9) to be plated, using the light beam or mark as a reference. Then, when the original (9) is placed on the original paper (3) and the upstream side thereof is held with the left hand, the holding member (8) is closed with the right hand. ) By (14), the main body (
1), and the base paper (3) and original (9) are pressed onto the guide (6) by the backup roller (15).

After that, when the start switch (not shown) is operated,
The pressurizing device (19) of the plate-making machine (7) is activated and the transparent glass plate (11) is raised together with the chassis (18), and the base paper (3) and the original (9) are pressed against the transparent plate (10). It is compressed by a glass plate (11). When the flash lamp (12) emits a flash of light in this state, a document image is formed in the first area (see FIG. 1) of the original paper (3) by this flash of light.

When the plate-making of the original image in the first area is completed, the pressure device (19) is driven, the transparent glass plate (11) is lowered together with the chassis (18), and the original paper (3a) after plate-making is removed. (9) is in a non-squeezing state. Then, when only the first pair of transport rollers (23) and (24) start rotating, the downstream edge portions of the original (9) and the original paper (3a) are separated, and
The original (9) passes between the guides (22) and (29) and is sent out towards the top of the main body (1), and the original paper (3a) after plate-making loosens and flows into the lower storage chamber (28). They are sent sequentially.

The base paper (3a) is the first transport roller pair (23) (24)
The flash timing mark (16
a) is detected by the first photocoupler (17) (17), that is, when the second area of the base paper (3) arrives on the transparent glass plate (11), the first transport roller Pairs (23) and (24) stop. After that, the same process as above is repeated to obtain the second number of base paper (3).
A manuscript image is made in the eye area, and the original paper (3) is sequentially stored in the storage chamber (28). At this time, in order to prevent a non-image forming part from occurring between the first area and the second area of the base paper (3), the intervals between the flash timing marks (16)... The length of the original image that is made into a plate by one light emission (the width that receives the flash) is also set to be slightly shorter. In this way, one sheet of original (9
), when the base paper (3) etc. is intermittently conveyed 5 times and the flash lamp (12) is emitted 6 times, the original image is made into a plate over the entire area (the length of one document) on the base paper (3), and the plate is made. The process will be completed. In this plate-making printing machine, the entire area of the original image is made into the base paper (3a) by emitting light six times, but by increasing the size and output of the flash lamp (12), etc., this number of times can be reduced. It is of course possible to reduce it.

The length of the original image formed by one light emission is:
This can be determined by controlling the rotational speed of the first pair of conveying rollers (23) and (24), but in consideration of slip etc., as in this embodiment, the flash pre-formed on the base paper (3) It is possible to carry out the conveyance more accurately by specifying the conveyance dimensions by detecting the timing mark (16) with the first photo coupler (17). 1 conveyor roller pair (23
) (24) starts rotating, and then the second pair of transport rollers (25) and (26) start rotating.
The downstream end of a) is a clamper (
37), both transport roller pairs (2
3) (24), (25) and (26) stop. After that, as the rotating cam (39) rotates, the attachment holes (67) of the base paper (3a)... are attached to the base paper holding pins ( 6
6), and its downstream end edge engages with the clamper (
37). The base paper (3a) is the clamper (37
) At the same time, when the plate cylinder (34) makes one rotation clockwise at low speed, the plate-made base paper (3a) stored in the storage chamber (28) is pulled out, and the plate cylinder (34) wrapped around. At this time, the second transport roller pair (25) (
26) follows with resistance, so the base paper (3a) is wound around the plate cylinder (34) while maintaining appropriate tension.
No wrinkles will occur.

Then, the winding of the base paper (3a) around the plate cylinder (34) is completed, the base paper (3a) stored in the storage chamber (28) is completely pulled out, and the cutting part is cut by the cutter (30) (31 ), that is, the cutting timing mark (6) is reached.
8) reaches a position where it is detected by the second photo coupler (27) (27), the operation signal for the cutter (30) (31) is output from this second photo coupler (27) (27). .

Then, the rotary blade (30) of the cutter is rotated by the output signal from the second photo coupler (27) (27), and the base paper (3a) is cut at a predetermined position.

Therefore, the base paper (3a) has the cutting timing mark (
68).

Once the base paper (3a) is cut, two test prints are then made to complete the printing preparation, and the time required up to this point is 29 seconds.

Thereafter, a predetermined number of sheets are printed, and when the predetermined number of sheets have been printed, the plate cylinder (34) stops with the non-printing area facing downward. This is to prevent printing ink from leaking and dripping due to the IJ-ben being on the lower side.

In this manner, while the first original (9) is being printed, the original image of the second original is made into a master paper (3) through the same steps as described above. That is, while the first manuscript (9) is being printed, the manuscript image of the second manuscript is made into a master paper (3) and stored in the storage chamber (19).

When a predetermined number of sheets of the first manuscript (9) have been printed, the plate discharge machine (40) is operated and the printed paper (3b) is stored in the paper storage box (42).

Note that the plate discharge machine (40) operates immediately after printing a predetermined number of sheets, but by appropriately selecting the sequence, the process of storing the base paper (3b) in the base paper storage box (42) can be performed as follows:
It can be overlapped with the plate-making process in chronological order, so that the plate discharge time can be substantially ignored.

Note that the plate ejecting operation may be performed by manual operation.

In addition, when printing on base paper that has already been made into a plate with a single plate-making machine, after releasing the holding member (8), rotate the guide (29) clockwise and insert the base paper into the base paper insertion guide. It is sufficient to insert it along (32).

Figures 5 to 7 show other embodiments of the plate-making printing machine,
Fig. 5 is a configuration diagram of the main parts, Fig. 6 is a perspective view of the main parts, and Fig. 7 is a block diagram showing the control circuit. In addition, since there is no difference in the paper transport means, the same parts are given the same reference numerals and the explanation thereof will be omitted, and only the main parts of the cutting device will be described in detail below.

In FIGS. 5 and 6, a second conveying roller pair (25) (
A cutting device having a linear heater (50) for cutting the base paper (3a) into a predetermined size is provided on the downstream side of 26). In addition to the second pair of transport rollers (25) (26>), this cutting device also uses a chassis (
A drive shaft (51) whose both ends are rotatably supported by a shaft (not shown), and a pair of heater holding arms (52) (52) fixed near both ends of this drive shaft (51). The drive shaft (
The heater (51) is stretched parallel to the rotation axis of the heater (51).
50), a torsion spring (53) that rotationally biases the drive shaft (51) in a counterclockwise direction, and a renoid (54) that rotationally drives the drive shaft (51) in a clockwise direction against the torsion spring (53). and a plunger (55).

The heater (50) has a diameter of 0.14 tpryx,
It is made of a straight nichrome wire with a length of 320 mm, and both ends thereof are held by the holding arms (52) (52) via insulators (56)' (56), and coil springs (57). ) tension is applied. In addition,
The holding arm (52) (52) is constituted by a leaf spring whose free end is slightly curved outward along the axial direction of the drive shaft (51), and the leaf spring itself has elasticity. Tension may be applied to the heater (50) depending on the temperature. (58) is a lead wire for supplying electricity to the heater (50). (65) is the plunger (5
5) and the drive shaft (51). Also(
59×60) is a guide plate for the base paper (3a).

Next, the operation of this cutting device will be explained mainly with reference to FIG.

When the cutting timing mark (68) of the base paper (3a) is detected by the second photo coupler (27) (27), the output signal from the second photo coupler (27) (27) is transferred to the first photo coupler (27) (27). It is input to a one-shot multivibrator (61). Then, the first one-shot multivibrator (61) outputs a conductive signal for only 2 seconds, and the DC power supply (62) supplies electricity to the heater (50) for only 2 seconds. The applied voltage at this time was 17.5V, and the current value was 0.7A. The output signal from the first one-shot multivibrator (61) is sent to a delay circuit (63).
is input to the second fun shot multivibrator (64) with a delay of one second.

Then, the second one-shot multipipulator (64) outputs a conductive signal for 0.3 seconds, and this output signal is input to the drive power source of the solenoid (54). Therefore, the plunger (5) of the solenoid (54)
In 5), after 1 second has elapsed since the heater (50) started being energized, the suction operation is performed for 0.3 seconds. At this time, the drive shaft (51) connected to the plunger (55) via the connecting frame (65) rotates clockwise,
The heater (50) being heated moves in a direction intersecting the plane of the base paper (3a), that is, in a direction in which the base paper (3a) is to be cut. Then, the base paper (3
In a), the portion in contact with the heater (50) melts or burns, and the base paper (3a) is thermally cut at that portion. When the solenoid (54) is de-energized, the torsion spring (53) returns the heater (50) to its home position.

This plate-making printing machine is controlled so that the solenoid is activated when the heater (50) is energized for 1 second.
If it takes time to raise the temperature of the heater (50), the delay time of the delay circuit (63) may be extended to about 1.5 seconds.

The applicant of the present invention conducted an experiment (at a room temperature of about 25° C.) under various conditions for energizing the heater (50), and was able to obtain the data shown in the table below.

In addition, in the above experiment, the thickness of the polypropylene fine denier paper superimposed on the polyester film was 10
This was done using a base paper (3) of about μ,
When cutting base paper made of natural fibers such as Manila hemp, it is necessary to increase the applied voltage to about 20 V to 22 V1 and the current to about IA, and to raise the temperature of the heater (50) to a higher temperature.

In this embodiment, the heat-sensitive stencil paper is attached to a plate-making printing machine, but it goes without saying that it may be supplied to a dedicated plate-making machine.

(G) Effects of the Invention In the present invention, since the mounting holes are previously formed in the roll-shaped base paper, there is no need to create the mounting holes in the plate-making device or the printing device. Therefore, there is no need to equip the device with a punching mechanism, and it is possible to reduce the cost of the device.

In addition, since the base paper is equipped with a means for displaying the cutting timing at predetermined intervals, when the base paper is cut according to this display means using a plate-making device, etc., as long as the display means is attached accurately, the cutting timing will be displayed accurately. is cut off. Note that the means for displaying the cutting timing can be accurately applied by industrial means at a base paper manufacturing factory or the like, so that the base paper can also be accurately cut.

Furthermore, the base paper made by a general plate making device without a perforation mechanism is processed by a printing device having a general plate cylinder without a clamper and only a base paper holding bin installed. Can be printed.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a part of an embodiment of the present invention. 2 to 4 show a plate-making printing machine to which an embodiment of the present invention can be installed, in which FIG. 2 is an external perspective view, FIG. 3 is a schematic configuration diagram, and FIG. 4 is a time chart. 5 to 7 show the main parts of another plate making printing machine to which an embodiment of the present invention can be installed, FIG. 5 is a schematic configuration diagram, FIG. 6 is a perspective view, and FIG. 7 is a control block. It is a diagram. (3) (3a) (3b) ・=Thermal stencil paper, (67
)-...Mounting hole, (68)...Means for displaying cutting timing (cutting timing mark).

Claims (1)

[Scope of Claims] 1. A band-shaped heat-sensitive stencil paper to which a heat-sensitive film and a porous thin paper are attached, which have an interval substantially required for one plate-making process along the extending direction. A plurality of mounting holes for the printing press are arranged in a direction intersecting the extending direction, and when cutting in the vicinity of the mounting holes in a direction substantially perpendicular to the extending direction, A heat-sensitive stencil paper, characterized in that it is equipped with a means for displaying cutting timing. 2. The heat-sensitive stencil paper according to claim 1, wherein the means for displaying the cutting timing also serves as a mounting hole. 3. The heat-sensitive stencil paper according to claim 1, wherein the means for displaying the cutting timing is a through hole opened separately from the attachment hole. 4. The heat-sensitive stencil paper according to claim 1, wherein the means for indicating the cutting timing is formed of a light reflecting member. 5. According to any one of claims 1 to 4, an optical detection part for optically detecting the front and back sides is provided at a position offset from the center toward one side edge. thermal stencil paper. 6. The heat-sensitive stencil paper according to any one of claims 1 to 5, wherein the mounting holes are opened at irregular intervals.