JP2000168221A - Plate supplying mechanism for rotary stencil printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate necessity of a work after completion of a stencil base sheet charging as much as possible. SOLUTION: When closure of an upper cover 50 is detected by an upper cover open/close sensing switch 8, conveying of a stencil base sheet 2 is started. When a leading end of the sheet 2 is detected by a leading end detecting sensor 6, and conveying is stopped after conveying at a predetermined distance. Thus, the end of the sheet 2 is positioned at a reference position W. The end of the sheet is cut after the stencil sheet is charged, and a work for removing cut chips is not required.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary stencil printing machine, and more particularly to a plate feeding mechanism for a rotary stencil printing machine.

[0002]

2. Description of the Related Art Conventionally, there has been provided a rotary stencil printing machine which can repeat stencil making and printing using roll-shaped stencil paper. In this type of apparatus, for example, a heat-sensitive stencil sheet is made by a thermal head, and the formed portion is cut by a cutter and wound around a plate cylinder. When positioning the stencil sheet with respect to the stencil sheet and positioning the stencil sheet with respect to the plate cylinder, the stencil sheet is conveyed when the leading edge of the stencil sheet cut by the cutter reaches the reference position in front of the plate cylinder so that printing misalignment with the paper does not occur. Is temporarily stopped and waits for plate making.

Since the cut end of the stencil sheet is conveyed from the cutter for a certain distance and stopped at a reference position, when the stencil sheet is loaded, first,
It is necessary to cut the leading end of the stencil sheet. Therefore, when the loading of the stencil sheet is completed, the operator needs to press the master set switch to send out the leading end of the stencil sheet, cut it, and remove the cut pieces. Such an operation is troublesome.

[0004]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a plate feeding mechanism for a rotary stencil printing machine which requires as little work as possible after completion of stencil sheet loading.

[0005]

SUMMARY OF THE INVENTION In order to solve the above technical problems, the present invention provides a plate feeding mechanism for a rotary stencil printing machine having the following configuration.

The stencil feeding mechanism of the rotary stencil printing press includes a conveying means for conveying the stencil sheet to the printing drum side, and a cutting means for cutting the stencil sheet to a predetermined length, and the predetermined length cut by the cutting means. The stencil sheet is of a type that sends the stencil sheet to the plate cylinder. The stencil feeding mechanism of the rotary stencil printing press includes a storage unit that stores a predetermined distance determined in advance, a leading end detecting unit that detects a leading end of the stencil sheet, and the stencil sheet being conveyed by the conveying unit. When the leading edge of the stencil sheet is detected by the leading edge detecting means, the stencil sheet is further conveyed by the predetermined distance, and thereafter, the conveying control means is provided for performing leading edge positioning control for stopping the stencil sheet conveyance by the conveying means.

In the above configuration, when the stencil sheet is loaded, the stencil sheet is conveyed to the drum cylinder side. Then, the leading end of the stencil sheet stops at a position advanced a predetermined distance from the leading end detecting means after passing through the leading end detecting means. Thus, the leading end of the stencil sheet can be stopped properly at the reference position without cutting the leading end portion of the stencil sheet after loading the stencil sheet.

Therefore, there is no need to remove the cut pieces of the stencil sheet after loading the stencil sheet.

Further, according to the above configuration, a predetermined distance at which the stencil sheet can be correctly stopped at the reference position is determined in advance before the device is shipped, and the distance is stored. Distance can be used. Thus, even if the position at which the leading edge detection means detects the leading edge of the stencil sheet varies from one apparatus to another, the leading edge of the stencil sheet can be correctly stopped at the reference position.

After the stencil sheet is loaded and the first stencil making is completed, that is, the leading end of the stencil sheet for the second and subsequent stencil sheets is positioned in the same manner as described above using the leading end detecting means.
Alternatively, as in the case of the conventional apparatus, it may be performed based on the transport distance from the cutting means.

Preferably, a loading completion detecting means for detecting the loading completion of the stencil sheet is provided. The transport control means starts the leading edge positioning control when the loading completion detecting means detects the completion of the loading of the stencil sheet.

According to the above configuration, when the completion of the loading of the stencil sheet is detected, the apparatus can automatically start conveying the stencil sheet and stop the leading end of the stencil sheet at the reference position.

Therefore, there is no need to press the master set switch to cut the leading end of the stencil sheet after loading the stencil sheet as in the conventional apparatus.

More specifically, a platen roller is disposed above and a thermal head is disposed below the stencil conveyance path, and the platen roller is supported so as to be able to retract from a normal position when the stencil paper is loaded. The loading completion detecting means detects the completion of loading of the stencil sheet when the retracted platen roller returns to the normal position.

According to the above arrangement, when the stencil sheet is loaded by retracting the platen roller, and the platen roller is returned to the initial position to complete the loading of the stencil sheet, the leading end of the stencil sheet is automatically moved to the reference position. Conveyed.

Preferably, an instruction operating means for an operator to perform a cutting instruction operation, and a cutting control means for cutting the stencil sheet by the cutting means when the instruction operating means receives a cutting instruction operation from the operator. Is provided.

According to the above construction, when a problem such as wrinkling of the stencil sheet occurs after the stencil sheet is loaded, the stencil sheet is cut by giving an instruction to the instruction operating means. Can be removed. Therefore, the processing when the inconvenience occurs in loading the stencil paper becomes simple and easy.

After cutting the stencil sheet, the stencil sheet including the cut portion may be automatically conveyed by a predetermined distance and stopped at a position where the cut section can be easily removed, or the cut section may be removed after cutting the stencil sheet. The conveyance of the stencil sheet may be interrupted until this.

When the stencil sheet is conveyed to the plate cylinder in a skewed state inclined with respect to the conveying direction, the stencil sheet becomes wrinkled, which interferes with the stencil image.

Preferably, the skew detecting means is disposed on the side of the printing drum from the cutting means along the stencil transfer path and detects whether the leading end of the stencil is inclined from a direction orthogonal to the stencil transfer direction. Means for cutting the stencil sheet in a state where the conveyance of the stencil sheet by the conveyance means is stopped when the skew detection means detects that the leading end of the stencil sheet is inclined from a direction orthogonal to the stencil sheet conveyance direction. To cut the stencil sheet to generate a warning.

According to the above configuration, when the stencil sheet is conveyed in a skewed state when the stencil sheet is loaded, the inclination of the leading edge of the stencil sheet is detected by the skew detecting means, and the stencil warning means detects the stencil sheet. Disconnect and give a warning. Therefore, it is possible to prevent the sheet from being conveyed to the plate cylinder in a skewed state and obstructing the plate-making image.

Further, the present invention provides a rotary stencil printing machine including the plate feeding mechanism of each of the above-described configurations.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary stencil printing press and a plate feeding mechanism according to an embodiment of the present invention will be described below.

The rotary stencil printing machine 10 is substantially the same as a known rotary stencil printing press except for a plate feeding mechanism.

The plate feeding mechanism is configured as shown in FIG. That is, roll-shaped stencil paper (master) 2
Are stored in a stencil roll storage unit provided in the printing press main body, and the leading end side thereof is drawn out to the plate cylinder 15. A mark detection sensor 4 for reading a mark formed at an appropriate position on the stencil sheet 2 is disposed below the stencil sheet roll storage unit. A stencil guide bar 5, fixed guide plates 12 and 14, a thermal head 30, idle rollers 7, and a tip detection sensor 6 are arranged below the transport path. A platen roller 2 is located above the transport path.
0, a cutter 16, a first sponge roller 22, and a second sponge roller 24 are arranged.

The rotation of the first sponge roller 22 is directly transmitted from a plate feeding motor 72 (see FIG. 3) via a belt (not shown). Rotation is transmitted to the platen roller 20 from a drive shaft of the first sponge roller 22 via a belt (not shown). In the second sponge roller 24,
The rotation is transmitted from the drive shaft of the first sponge roller 22 via a belt and a plate feeding clutch 74 (see FIG. 3). The second sponge roller 24 can be rotated or stopped when the platen roller 20 and the first sponge roller 22 rotate by the engagement and disengagement of the plate feeding clutch 74. The plate feeding motor 72 outputs a rotation pulse proportional to the rotation angle in order to control the transport distance.

The cutter 16 is a rotary blade, and is rotatably held by a cutter holding unit 16x. The cutter holding unit 16x is reciprocally driven by a cutter motor 16a (see FIG. 3) in a direction crossing the stencil sheet transport path. Cutter stop position detection switches 16s and 16t for detecting the cutter holding unit 16x retracted from the stencil sheet conveyance path are provided on the operation side and the back side of the conveyance path. At the time of cutting the stencil sheet, the cutter motor 16a rotates forward, the cutter holding unit 16x moves from the operation side to the back side, and when the cutter holding unit 16x is detected by the cutter stop position detection switch 16t on the back side, the cutter motor 16a rotates in the reverse direction to hold the cutter. The unit 16x moves to the operation side. When the cutter holding unit 16x is detected by the operation side cutter stop position detection switch 16s, the cutter motor 1
6a and thus the cutter holding unit 16x stops.

The platen roller 20 is supported by the upper cover 50. The upper cover 50 is a first sponge roller 2
1 and is rotatably supported coaxially with the rotation shaft 2 so as to be able to rotate to a substantially vertical position indicated by a chain line in FIG. The open / close of the upper cover 50 is detected by the upper cover open / close detection switch 8.

When the upper cover 50 is opened, as shown in FIG. 2, the platen roller 20 is exposed at a position close to the height of the line of sight L of the operator M.
Can easily see and access the platen roller 20. Therefore, when the stencil sheet 2 is loaded or when a trouble such as the stencil sheet 2 rolling up on the platen roller 20 occurs, the operator M can easily work at a position close to the height of the line of sight L. Further, since the opening angle of the upper cover 50 is as large as about 90 degrees, the thermal head 30 provided below the stencil sheet transport path can be easily cleaned.

The tip side of the upper cover 50 has a curved shape along which the stencil sheet 2 extends. By causing the stencil sheet 2 to follow the curved portion for a predetermined length or more, generation of chattering noise is prevented. That is, when the remaining amount of the stencil paper roll is reduced by a certain amount, the stencil paper guide bar 5 is used.
The insertion angle of the stencil sheet 2 with respect to the curved portion, in other words, the contact length with respect to the curved portion due to the decrease in the drawing angle of the stencil sheet 2 is reduced.

The thermal head 30 can be moved toward and away from the platen roller 20 by driving a thermal head moving motor 40 (see FIG. 3). The thermal head 30 approaches the plantain roller 20 when the wrinkles of the stencil sheet 2 are stretched and during stencil making, but is separated from the platen roller 20 at other times. The position of the thermal head 30 is detected by a thermal head contact / separation position detection sensor 38 (see FIG. 3).

Next, the configuration of the control system will be described with reference to FIG.

The CPU 80, which controls the entire apparatus, includes an operation panel 70 for giving instructions from an operator, a ROM 82 for storing a control program, a RAM 84 for temporarily storing data, and a RAM 84 for temporarily storing data. An EEPROM 86 that stores the number of stop counters for stopping the leading end of the stencil sheet at the reference position W is connected. Further, the CPU 80 includes the thermal head 30,
Thermal head contact / separation gear motor 40, plate feeding motor 72, cutter motor 16a, cutter stop position detection sensors 16s and 16t, upper cover open / close detection switch 8, master reset switch 9, plate feeding clutch 74, , A mark detection sensor 4, a tip detection sensor 6,
A thermal head contact / separation position detection sensor 38 and the like are also connected.

Next, the operation and operation will be described.

As shown in FIG. 2, the upper part 11 of the printer body is
Is opened and the stencil sheet 2 is loaded. Roll-shaped stencil paper 2
Is inserted into the stencil roll storage section of the printing press body. Then, as shown in FIG. 1, the upper cover 50 is opened, the leading end of the stencil sheet 2 is pulled out, passed through the tunnel-shaped stencil sheet tip holding section 13 provided on the fixed guide plate 12, and lifted by the curl. While pressing, the leading end of the stencil sheet 2 is set to the set position S, that is, the end of the thermal head 30 on the plate cylinder side, and then the upper cover 50 is closed. When the upper cover 50 is closed, the stencil sheet 2 is automatically conveyed. And
When the leading end of the stencil sheet 2 reaches the reference position W after passing through the leading end detection sensor 6, the conveyance is temporarily stopped, and the start of stencil making is waited. That is, the leading end of the stencil sheet 2 is positioned at the reference position W.

At this time, if there is a defect such as wrinkles on the stencil sheet 2, the master reset switch 9 is pressed. Thus, after the cutter 16 cuts the stencil sheet 2, the stencil sheet 2 is transported together with the cut front end portion by a predetermined distance until the rear end of the cut front end portion passes through the first sponge roller 22. ,Stop. At that time, the second sponge roller 24 remains stopped, and the cut distal end portion is not conveyed to the second and subsequent sponge rollers 24 and the first and second sponge rollers 2.
It is between 2,24. At the same time, the panel display indicates "master reset", and the operator opens the upper cover 50, removes the cut defective portion, rewinds the stencil sheet 2, and puts the leading end of the stencil sheet. The upper cover 50 is closed by passing it through the stencil leading end holding unit 13 to the set position S, and closing the upper cover 50. When the upper cover 50 is closed, the stencil sheet 2 is automatically conveyed and stops at a predetermined position.

Next, conveyance control of the stencil sheet will be described.

First, the initial adjustment before shipping the apparatus will be described with reference to the timing chart of FIG. 4 and the flowchart of FIG.

In step # 12, the operator inserts the stencil sheet 2 in the roll form into the stencil sheet roll storage unit, opens the upper cover 50, pulls out the leading end of the stencil sheet 2,
The leading end of the stencil sheet 2 is set at the set position S through the stencil sheet tip holding section 13.

Next, when the upper cover 50 is closed in step # 14, the platen roller 20 and the first sponge roller 22 start rotating in step # 16. That is, the output of the upper cover open / close detection switch 8 is O
When the state changes from N to OFF (when the upper cover is closed), the plate feeding clutch 74 is engaged, and the plate feeding motor 72 starts rotating.

In step # 18, the process waits until the leading edge detection sensor 6 detects the leading edge of the stencil sheet 2. When the leading end of the stencil sheet 2 is detected, the internal counter of the CPU 80 is reset in step # 20, and
At 2 the counting is started. That is, when the output of the leading edge detection sensor 6 changes from OFF (without stencil sheet) to ON (with stencil sheet), counting of rotation pulses of the stencil feeding motor 72 is started. Then, in step # 24, the count value is the number of stop counters (the default value is N).
When the count value reaches the stop count number, the counting is stopped in step # 26, and the rotation of the platen roller 20 and the first sponge roller 22 is stopped in step # 28.

Then, in step # 30, the operator checks whether the leading end of the stencil sheet 20 has stopped at the reference position W.

If the leading end of the stencil sheet 2 is not stopped at the reference position W, the stop count is appropriately changed in step # 32, and in step # 34, the upper cover 50 is opened and the stencil sheet 2 is rewound. The leading end of the base paper 2 is set at the set position S, the process returns to step # 14, and the above procedure from step # 14 is repeated.

For example, as shown in FIG. 4, when the stop count number is the default value N, the leading end of the stencil sheet 2 is positioned at the reference position W.
In this case, the stop count is changed from N to N + 1, the stencil sheet 2 is set again, and the stop position of the stencil sheet 2 is checked. If the vehicle still stops just before the reference position W, the reference value is further changed from N + 1 to N + 2.

When the leading end of the stencil sheet 2 stops at the reference position W, the initial adjustment before shipping the apparatus is completed. The determined stop counter number (for example, N + 2) is stored in the EEPROM 86 which retains data storage even when the power is turned off.

Next, the transport operation after the device is shipped, that is, during normal use, will be described with reference to the timing chart of FIG.

When the stencil sheet 2 is loaded and the upper cover 50 is closed, the output of the upper cover open / close detection switch 8 changes from OFF to ON. Then, the plate feeding clutch 74 is engaged, the plate feeding motor 72 starts rotating, the platen roller 20 and the first sponge roller 22 start rotating,
The conveyance of the stencil sheet 2 starts. Then, when the output of the leading edge detection sensor 6 changes from OFF to ON and the leading edge of the stencil sheet 2 is detected, the counting of the rotation pulse of the plate feeding motor 72 is started using the internal counter of the CPU 80. When the count value reaches the stop counter number (for example, N + 2) that has been initially adjusted and stored at the time of shipment of the apparatus, the plate feeding motor 72 is stopped, and the rotation of the platen roller 20 and the first sponge roller 22 is stopped. .

Thereafter, although omitted in FIG. 6, the stencil sheet 2 is conveyed at a predetermined timing by the thermal head 30 at a predetermined timing, similarly to the conventional apparatus. When the plate making is completed, the conveyance is stopped, and the plate made portion is cut by the cutter 16. Next, the plate feeding clutch 74 is disengaged, the plate feeding motor 72 starts rotating, and only the cut end portion is conveyed by the first and second sponge rollers 22 and 24 and wound around the plate cylinder 15. .

After the plate-making portion of the first plate has been wound, in order to prepare the second plate, the plate feeding clutch 74 is engaged, and the plate feeding motor 72 starts rotating. 20 and first sponge roller 22
Starts rotation, and the leading end of the stencil sheet 2 stops at the reference position W and waits, as in the case of the first plate. Thereafter, it operates at the same timing.

When the stencil sheet 2 runs out, the upper cover 50 is opened, and the next stencil sheet 2 is loaded.

Next, the operation for changing the setting of the stop count will be described with reference to the flowchart of FIG.

In step # 50, the power of the apparatus is temporarily turned off. In step # 52, the power of the apparatus is turned on again while pressing a predetermined button on the operation panel 70, so that the control program of the CPU 80 is changed from the normal user mode to the serviceman. Switch to mode.

Then, the stencil sheet 2 is loaded, and step #
At 54, the user visually checks whether or not the leading end of the stencil sheet 2 stops before the reference position W. If it is stopped before, in step # 56, the number of stop counters is increased by the shortage. On the other hand, if it exceeds the reference position W, in step # 58, the stop counter number is reduced by the excess.

In step # 60, after the power of the apparatus is once turned off, the power is turned on again without pressing the button of the operation panel 70, and the control program is switched from the serviceman mode to the normal user mode.

As described above, the operation for loading the stencil sheet is simplified by using the sensor for detecting the leading end of the stencil sheet.

By the way, as shown in the plan view of FIG.
The leading edge detection sensor 8 is disposed at the center of the stencil sheet transport path, and has, on both sides thereof, first and second skew sensors 101 and 10 for detecting the inclination of the leading edge of the stencil sheet 2.
2 are arranged. First and second skew sensors 10
Reference numerals 1 and 102 are arranged in a direction orthogonal to the stencil sheet transport direction. When the stencil sheet 2 is transported obliquely, the first
In addition, the timing at which the second skew sensors 101 and 102 detect the leading end of the stencil sheet 2 is shifted.

Then, as shown in FIG. 9, one of the first and second skew sensors 101 and 102 (for example, the first skew sensor 101) is turned ON, and the stencil sheet 2 is turned on.
When the leading edge of the skew detection is detected, the internal counter of the CPU 80 starts counting rotation pulses of the plate feeding motor 72, and the other of the first and second skew sensors 101 and 102 (for example, the second skew sensor 102) is turned on. becomes, upon detecting the leading end of the stencil sheet 2, stops counting, the counter number N is equal to the predetermined reference value N ₀ or is treated as a "skew error".

In the case of a "skew error", the cutter 16 cuts the stencil sheet 2 while the conveyance of the stencil sheet 2 is stopped, and a warning message prompting to reset the stencil sheet 2 "Reset the master." Is displayed on the panel.

Thus, it is possible to prevent the stencil sheet 2 from being conveyed in a skewed state and wrinkled on the stencil sheet 2 to prevent the stencil image from being disturbed.

The present invention is not limited to the above embodiment, but can be implemented in various other modes.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a plate feeding mechanism of a rotary stencil printing machine according to the present invention.

FIG. 2 is a perspective view of the rotary stencil printing machine of the present invention.

FIG. 3 is a block diagram of a control system of the rotary stencil printing machine of the present invention.

FIG. 4 is an operation timing chart before the device is shipped.

FIG. 5 is a flowchart of an initial adjustment before the device is shipped.

FIG. 6 is an operation timing chart after the device is shipped.

FIG. 7 is a flowchart of readjustment before the device is shipped.

FIG. 8 is a plan view of a main part of a stencil sheet conveyance path.

FIG. 9 is a timing chart at the time of skew detection.

[Explanation of symbols]

 2 stencil sheet 4 mark detection sensor 5 stencil sheet guide bar 6 tip detection sensor (tip detection means) 7 idle roller 8 upper cover open / close detection switch (loading completion detection means) 9 master reset switch (instruction operation means) 10 rotary plate Printing machine 11 Upper part 12 Fixed guide plate 13 Stencil stencil tip holding part 14 Fixed guide plate 14a Clearance 14b Cutter hole 15 Plate cylinder 16 Cutter (cutting means) 16a Cutter motor 16s, 16t Cutter stop position detection switch 16x Cutter holding member 17 Lock Shaft 20 Platen roller (transporting means) 22 First sponge roller (transporting means) 24 Second sponge roller (transporting means) 30 Thermal head 50 Upper cover 70 Operation panel 72 Plate feeding motor 74 Plate feeding clutch 80 CPU (Transporting control unit) Cutting control means) 82 ROM 84 RAM 86 EEPROM (storage means) 101 and 102 skew sensor L Looking M operator S set position W reference position

Claims (6)

[Claims] 1. A conveying means (20, 22, 24) for conveying a stencil sheet (2) toward a plate cylinder (15), and a stencil sheet (2).
Cutting means (16) for cutting the stencil sheet into a predetermined length, and feeding the stencil sheet of a predetermined length cut by the cutting means (16) to the plate cylinder (15). In the mechanism, a storage means (86) for storing a predetermined distance determined in advance
And a leading edge detecting means (6) for detecting a leading edge of the stencil sheet (2).
When the stencil sheet (2) is conveyed by the conveying means (20, 22, 24) and the leading end of the stencil sheet (2) being conveyed is detected by the leading end detecting means (6), the stencil sheet is further moved by the predetermined distance. After the stencil sheet (2) is conveyed, the conveyance control means (8) for controlling the leading end positioning for stopping the conveyance of the stencil sheet (2) by the conveying means (20, 22, 24).
0), a plate feeding mechanism for a rotary stencil printing machine. 2. A stencil sheet (2) is provided with loading completion detecting means (8) for detecting completion of loading, and the transport control means (20, 22, 24) is controlled by the loading completion detecting means (8). 2. The plate feeding mechanism of a rotary stencil printing machine according to claim 1, wherein the tip position control is started when the completion of the loading in (2) is detected. 3. A platen roller (20) is disposed above and a thermal head (30) is disposed below the stencil sheet conveyance path, and the platen roller (20) is retracted from a normal position when the stencil sheet is loaded. The loading completion detecting means (8) supports the stencil sheet (2) when the retracted platen roller (20) returns to the normal position.
3. The plate feeding mechanism of a rotary stencil printing press according to claim 2, wherein completion of loading of the stencil is detected. 4. An instruction operation means (9) for an operator to perform a cutting instruction operation, and a stencil printing means by the cutting means (16) when the instruction operation means (9) receives a cutting instruction operation from the operator. 4. A plate feeding mechanism for a rotary stencil printing machine according to claim 2, further comprising cutting control means (80) for cutting the base paper (2). 5. A stencil sheet (2) disposed along the stencil sheet conveyance path on the side of the plate cylinder (15) from the cutting means (16), and the tip of the stencil sheet (2) is inclined from a direction perpendicular to the stencil sheet conveyance direction. Skew detection means (101, 1)
02), and when the skew detecting means (101, 102) detects that the leading end of the stencil sheet (2) is inclined from a direction orthogonal to the stencil sheet conveying direction, the conveying means (20,
22 and 24), the cutting means (16) is operated while the conveyance of the stencil sheet (2) is stopped, and the stencil sheet (2) is operated.
Warning means (70, 80) for cutting off and issuing a warning
The plate feeding mechanism of a rotary stencil printing machine according to claim 1, comprising: 6. A rotary stencil printing press, comprising the plate feeding mechanism of the rotary stencil printing machine according to claim 1.