JPH07117321A - Apparatus for supplying form plate in stencil printing machine - Google Patents

Abstract

PURPOSE:To quickly and positively detect and remove jamming of a fed form plate, by providing a controlling means for stopping the operation of a driving means and activating a cutter when jamming of the fed form plate is detected by a detecting sensor. CONSTITUTION:When a form plate production is started, a motor 10 is rotated in a direction of an arrow and also a all feed rollers are rotated in a direction of the arrow, so that a base paper 1 is transferred to a printing drum. When a front end of the transferred base paper 1 is clamped by a clamper of the printing drum, a third roller 8 is let out of the clutch, and the third feed rollers 7, 8 are stopped to rotate thereby to stop the transfer. Meanwhile, rear second feed rollers 5, 6 are continuously rotated to continue the transfer. As a result, the stencil base 1 bends upward between the second and third feed rollers 5, 6 and 7. When the bend is detected by a sensor 9, a main motor is driven to rotate the printing drum, whereby the stencil base 1 is drawn out and freed from the bend. The sensor 9 is turned OFF and the main motor is stopped thereby to stop the rotation of the printing drum.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plate feeding device for a stencil printing machine.

[0002]

2. Description of the Related Art A plate feeding apparatus having a plate feeding unit provided between a printing drum of a stencil printing machine and a plate making unit for feeding a roll base paper made by the plate making unit is disclosed in, for example, JP-A-60- It is known as seen in Japanese Patent No. 188265.

[0003]

In the plate feeding apparatus as described above, the base paper is not clamped by the clamper of the print drum, or the base paper is separated from the print drum after being clamped, or the base paper is not clamped by the clamper of the print drum. The base paper is clamped, but if the base paper is cut for some reason or other reasons, it may cause a plate feed jam and interfere with the smooth continuation of printing work. There is no means to quickly remove the jam generated by detecting the occurrence of the jam, and each time it occurs, the worker does it by the troublesome work of tearing it off, so it seems that the work efficiency decreases. There is a problem.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the problems of the conventional plate feeding apparatus, to quickly and accurately detect a plate feeding jam when it occurs, and to easily remove the jam. It is to provide a plate feeding device capable of performing.

[0005]

In order to achieve the above-mentioned object, the present invention is provided between a printing drum and a plate making means, and feeds a roll base paper made by the plate making means. Means, and a sensor provided in the plate supply means for detecting the occurrence of a plate supply jam in the roll base paper,
The driving means for driving the plate feeding means, a cutter provided between the plate making means and the plate feeding means, and a control means for controlling the operation of the driving means and the cutter, the control means, When the occurrence of a plate feeding jam is detected by the sensor, the driving means is stopped and the cutter is operated. The plate making means has a thermal head and a first feed roller for nipping and feeding the base paper between the thermal head and the plate feed means, and a second feed roller composed of a pair of rollers for nipping and feeding the roll base paper. It has a 3rd feed roller, a motor which drives the 2nd feed roller, and a drive mechanism which drives the 3rd feed roller in cooperation with this motor.

[0006]

In the present invention as described above, the roll base paper, which is made by the plate making means and sent to the printing drum by the plate supplying means, is not clamped by the clamper of the printing drum, or the base paper is clamped after being ejected from the printing drum. The sensor detects if the plate feed jam occurs due to separation or the base paper is clamped by the clamper of the printing drum, but the base paper is cut between the first and second feed rollers. Then, by the detection signal,
The operation of the driving means is stopped to stop the plate feeding operation by the plate feeding means, the cutter is operated to cut the raw paper, and the worker removes the raw paper thus cut.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention shown in the drawings, 1 is a roll base paper, 2 is a first feed roller for nipping the base paper 1 between it and a thermal head 3, and 4 is behind the first feed roller 2. The arranged cutters 5, 5 and 6 are further arranged at the rear of the cutter 4, and the second feed rollers 7 and 8 interlocking with each other by gear engagement are arranged at the rear of the second feed rollers 5 and 6 with a space therebetween. Third feed rollers 9 arranged and interlocking with each other by gear engagement, 9 are second and third feed rollers 5, 6;
A bending sensor disposed between 7 and 8 is a flexure sensor, 10 is a base paper transport motor, and the base paper transport motor 10 is a belt 11, 12.
The first and second feed rollers 2 and 6 are driven via the respective rollers, and the rotation of the second feed roller 6 is transmitted to the third feed roller 8 via the belt 13 and a clutch (not shown).

In such a plate feeding apparatus, when plate making is started, the motor 10 rotates in the direction of the arrow, and along with this, all the feed rollers rotate in the direction of the arrow, whereby the base paper 1 is not shown in the drawing drum. (Fig. 2). When the leading end of the base paper conveyed in this way is clamped by the clamper of the printing drum, the clutch of the third feed roller 8 is disengaged, the rotation of the third feed rollers 7, 8 is stopped, and the conveyance is stopped. However, since the second feed rollers 5 and 6 located behind it continue to rotate, conveyance is continued here,
As a result, the base paper 1 bends between the second and third feed rollers 5, 6; 7, 8 and bends upward (FIG. 3). When this bending is detected by the sensor 9, the main motor (not shown) is operated to rotate the printing drum, whereby the base paper 1
Is pulled out to eliminate the bending, the sensor 9 is turned off, the operation of the main motor is stopped, the rotation of the printing drum is stopped, and such an operation is repeated until the plate making is completed.

In such a system, a control unit (not shown) is provided in order to automatically detect the jam of the plate feeding and reduce the work of the operator, and the control unit includes a microcomputer. A program that operates according to the flowchart shown in FIG. 4 is installed in this microcomputer. In this flowchart, the first timer T1 is set to the third feed rollers 7 and 8
The base paper 1 has been fed and the sensor 9
Is required to switch from OFF to ON, and the second timer T2 is set to the time required to switch the sensor 9 from ON to OFF when the base paper 1 is pulled by the rotation of the printing drum. .

In such a case, when the base paper 1 is not clamped by the clamper of the print drum or the base paper 1 is detached from the print drum after being clamped, a plate feed jam occurs even if the print drum rotates. Since the sensor 9 does not switch from on to off and remains in the on state forever, the second timer T2 times out and the occurrence of the plate feeding jam is known. Further, although the base paper 1 is clamped by the clamper of the printing drum, if the base paper 1 is cut for some reason, for example, between the first feed roller 2 and the second feed rollers 5 and 6, the base paper 1
Is continuously sent, the sensor 9 does not turn on within the time set by the first timer T1 and times out,
You can know the occurrence of plate feeding jam. In this way, since it is possible to know the occurrence of the plate feeding jam from the start to the end of the plate feeding, it is not necessary to provide a special sensor for that.

When it is known that a plate feeding jam has occurred as described above, the motor 10 is stopped, the base paper 1 is cut by the cutter 4, and the worker quickly removes the jammed base paper. , The motor 10 is operated to feed the front end of the base paper 1 to the point A in FIG. 1 so that the next plate making can be started promptly, and the operator relies on the operator to set the base paper 1 after the occurrence of the plate feeding jam. Will disappear.

[0012]

The present invention is as described above, and is provided between the printing drum and the plate making means, and means for feeding the roll base paper made by the plate making means, and the plate supplying means. A sensor for detecting the occurrence of a plate feeding jam on the roll base paper, a driving unit for driving the plate feeding unit, a cutter provided between the plate making unit and the plate feeding unit, and the driving unit and the cutter. When the sensor detects the occurrence of a plate feed jam, the control means stops the operation of the drive means and activates the cutter. When a plate jam occurs, it can be detected quickly and accurately, and the roll paper can be cut by the cutter while stopping the plate feeding of the paper by the drive means, making the jam paper quick and easy. There is an effect that it is possible to improve the printing efficiency can be removed.

[Brief description of drawings]

FIG. 1 is a front view of an embodiment of the present invention.

FIG. 2 is a partial front view of the same operation at the time of one operation.

FIG. 3 is a front view of part of the above-mentioned other operation.

FIG. 4 is a flowchart of the control unit of the above.

[Explanation of symbols]

 1 Roll Base Paper 2 First Feed Roller 3 Thermal Head 4 Cutter 5,6 Second Feed Roller 7,8 Third Feed Roller 9 Deflection Sensor 10 Base Paper Conveying Motor T1 First Timer T2 Second Timer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hironori Takazawa 1st 3rd Shinmeidou, Nakameisei, Shibata-cho, Shibata-gun, Miyagi Prefecture Tohoku Ricoh Co., Ltd. Jinmyodo 3 No. 1 Tohoku Ricoh Co., Ltd.

Claims (2)

[Claims] 1. A plate feeding unit which is provided between a printing drum and a plate making unit and which feeds a roll base paper made by the plate making unit, and a plate feed jam which is provided at the plate making unit and which occurs in the roll base paper. A sensor for detecting the plate feeding means, a driving means for driving the plate feeding means, a cutter provided between the plate making means and the plate feeding means, and a control means for controlling the operation of the driving means and the cutter. The plate supply device for a stencil printing machine, wherein the control means comprises means for stopping the operation of the drive means and operating the cutter when the occurrence of a plate supply jam is detected by the sensor. 2. The plate making means has a thermal head and a first feed roller which nips and feeds the raw paper between the thermal head and the plate feed means, which comprises a pair of rollers for nipping and feeding the roll raw paper. The stencil printing machine according to claim 1, further comprising: a second feed roller and a third feed roller; a motor for driving the second feed roller; and a drive mechanism for driving the third feed roller in cooperation with the motor. Plate equipment.