JPH07137421A - Plate discharge device in stencil printing press - Google Patents

Abstract

PURPOSE:To surely prevent a false operation of a plate discharge device by providing a plate discharge box inside detection means detecting whether an amount of stencil original paper existing in a plate discharge box exceeds a predetermined amount when the plate discharge box is set to installation position. CONSTITUTION:Used stencil original paper 24 is peeled off the outer peripheral. surface of a printing drum and fed into a plate discharge box 74 by plate discharge feed rollers 64, 66. Every time when stencil original paper 211 of the predetermined number is contained in the plate discharge box 74, the plate discharge box 19 is removed from an installation position. In this device, a light-reflecting sensor 88 is provided for detecting whether an amount of stencil original paper 211 in the plate discharge box 74 exceeds a predetermined amount (preferably zero) when the plate discharge box 74 is disposed in position on a receiving mount 86. In addition, a light-reflecting sensor 84 is provided for detecting the residual state of the stencil original. paper 24 in the plate discharge box 74. In the absence of the stencil original paper 24 of more than the predetermined amount in the plate discharge box 74, a count value obtained by counting a plate discharge process is reset to zero, and an inhibition of plate making is canceled.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the technical field of stencil printing, and more particularly, to improvement of a plate discharge device of a stencil printing machine.

[0002]

2. Description of the Related Art As a stencil ejector of a stencil printing machine, which is used for stripping a used stencil sheet after printing from a printing drum,
A stencil box, a stencil sheet feeding means for peeling the used stencil sheet from the outer peripheral surface of the printing drum and sending it into the stencil sheet box, a stencil sheet counting means for counting the number of stencil sheet discharges by the stencil sheet feeding means, and a stencil sheet counting means. When the number of plate discharges reaches a predetermined value, it has a plate discharge removal instruction means for promoting removal of the stencil sheet from the inside of the plate discharge box. A message prompting you to remove the stencil sheet from inside is displayed, where the user removes the stencil sheet, removes the stencil sheet that has accumulated inside the stencil sheet box, and returns the stencil sheet to the original position. A stencil ejector of a stencil printing press having a structure in which the counting means is reset has been used for a long time in the stencil printing press.

[0003]

In the plate discharge device of the stencil printing machine having the above-mentioned structure, when the stencil sheet accumulated therein is removed from the stencil box, the stencil sheet is not sufficiently removed. The stencil box is returned with a substantial amount of stencil sheet still remaining in the stencil box, or the stencil box is used for maintenance and inspection before counting the number of stencil plates reaching the predetermined value. When the plate is removed and then returned as it is, the plate discharge counting means reset by the return of the plate discharge box newly counts the number of plate discharges from the state in which the plate discharge box is not empty. Before counting the number of times, the inside of the stencil box is filled with stencil sheet, and the stencil sheet containing the used ink discharged from the printing drum overflows to the outside of the stencil box, and the surrounding area is contaminated with ink and Wrap around the feed roller Normal operation there is a fear causing a failure such is not performed in the plate device.

The present invention provides a plate discharge device for a stencil printing machine, which is improved so as to avoid the above problems in the plate discharge device for a stencil printing machine having the above-mentioned basic structure. The task is to do.

[0005]

SUMMARY OF THE INVENTION According to the present invention, the above-mentioned problem is basically solved by stripping the stencil box and the used stencil sheet from the outer peripheral surface of the printing drum and feeding them into the stencil box. A plate discharge feeding unit, a plate discharge counting unit for counting the number of plate discharges by the plate discharge feeding unit, and a plate discharge removal instruction unit for urging the stencil sheet to be removed from the plate discharge box, and a predetermined number of sheets in the plate discharge box. Each time the stencil sheet is accommodated, the stencil sheet is removed from the installation position, the stencil sheet accumulated inside the stencil sheet is removed, and the stencil sheet is ejected from a stencil printer configured to return the stencil sheet to the installation position. A stencil printing machine characterized in that it has an stencil box internal detection means for detecting whether or not there is a stencil sheet exceeding a predetermined amount in the stencil box when the stencil box is in the installation position. Achieved by plate ejection device .

The plate discharge box has an opening, and the inside plate discharge box detecting means is a means for inspecting the inside of the plate discharge box from the outside of the plate discharge box through the opening in a non-contact manner. Good.

Further, according to the present invention, the above-mentioned problems are more preferable, and a stencil box, and a stencil sheet feeding means for stripping a used stencil sheet from the outer peripheral surface of the printing drum and sending it into the stencil sheet box. Plate discharge counting means for counting the number of plate discharges by the plate discharge feeding means, plate discharge removal instruction means for promoting removal of the stencil sheet from the plate discharge box, and plate discharge for detecting whether the plate discharge box is installed at a predetermined position or not The plate discharge detecting means has a box setting detecting means, a discharge box inner detecting means for detecting whether or not there is a stencil sheet exceeding a predetermined amount in the plate discharging box, and a count resetting means for resetting the plate discharging counting means. When the predetermined number of plate discharges is counted by the counting unit, the plate discharge removal instruction unit prompts to remove the stencil sheet from the plate discharge box, and then the plate discharge box installation detection unit determines the plate discharge box. When it is detected that the stencil sheet is installed in the tray and the stencil box internal detection means detects that there is no stencil sheet exceeding the predetermined amount in the stencil box, the counting resetting means resets the stencil counting means. This is achieved by a plate discharging device of a stencil printing machine.

[0008]

As described above, the plate discharge box internal detection means for detecting whether or not the stencil sheet exceeding the predetermined amount is present in the plate discharge box when the plate discharge box is at the predetermined installation position is provided. It is possible to confirm whether the stencil sheet has been sufficiently removed from the inside of the box, and based on the result, the work of removing the stencil sheet from the inside of the stencil box again is prompted, and the number of stencil sheet counting means for counting the number of stencil sheets is counted. Any suitable control operation can be performed, such as withholding the reset.

Furthermore, as described above, the number of plate ejections is counted,
When the number of stencil sheet ejections reaches a predetermined value, it prompts to remove the stencil sheet from the inside of the stencil box, and after that, the stencil sheet is installed at the predetermined installation position and there is a stencil sheet exceeding the predetermined amount in the stencil sheet box. When the failure is detected, the plate discharge counting means is reset so that the number of plate discharges reaches a predetermined value, and the user operates the means for urging the stencil sheet to be removed from the plate discharge box. During normal operation of removing the stencil paper more, if the stencil paper accumulated there is not sufficiently removed from the stencil box, the stencil sheet counting means is not reset, and maintenance and inspection before the number of stencil sheet discharge reaches a predetermined value. If the stencil box is once removed and then restored,
Since the plate discharge counting means is not reset, the malfunction of the plate discharge device, which would tend to push a predetermined amount or more of the stencil sheet into the plate discharge box, is surely avoided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in more detail below with reference to the accompanying drawings.

FIG. 1 attached herewith is a schematic diagram showing one embodiment of a stencil printing machine equipped with a plate discharging apparatus according to the present invention.
The illustrated stencil printing machine has a configuration as a stencil printing machine that also performs plate making. In FIG. 1, reference numeral 10 denotes a rotary printing drum, the main part of the cylindrical surface of which is composed of a thin and flexible porous sheet material, around which the stencil sheet made by plate making is wrapped, The ink is supplied from the inner peripheral surface by the inking roller 12 provided in contact with the inner peripheral surface. The flexible cylindrical portion of the printing drum 10 is bulged outward in the radial direction at a portion in contact with the inking roller 12 by selectively biasing the inking roller 12 downward in the drawing, and the bulging portion Is pressed against the cylindrical surface of the back-pressing roller 14 arranged facing each other along the generatrix thereof, and a printing image is formed on the printing paper pressed between the two according to the perforated portion of the stencil sheet. ing. A stencil printing machine having such a structure is disclosed in Japanese Patent Laid-Open No.
It is disclosed in Japanese Patent No. 204781. Printing drum 10
Is provided with a crosspiece 16 for mounting the starting end of the stencil sheet, which extends in the generatrix direction of the cylindrical body, and a clamp 18 for selectively sandwiching and holding the starting end of the stencil sheet is provided at this portion.

Reference numeral 20 denotes a plate making section for making a stencil sheet, which is a belt-like stencil sheet 24 which is unwound from a roll 22 which is a supply source of the stencil sheet and sent through several roll groups.
It includes a punching means 26 for punching according to an image by a large number of fine thermal heads arranged in a line, and a cutter 28 for cutting out each stencil made from a band-shaped stencil sheet.

A plate making unit 20 reads an image from a document.
An original reading unit for sending an image signal to the original, which has a light source 32 and a photodiode 34 and reciprocates along a rail 36 to reciprocate while scanning the image surface of the original placed on a glass plate 38. A read head 40 is included.

Reference numeral 42 denotes a printing paper supply section, which is a paper feed table 44 for holding a stack of printing paper sheets, and a printing paper take-out roller for taking out the printing paper from above the printing paper stack body placed on the paper feeding table. 46, a printing paper separating roller 48 for separating the printing paper taken out therefrom, and a timing roller 50 for feeding the printing paper between the printing drum 10 and the back pressing roller 14 in synchronization with the rotation of the printing drum 10 and the back pressing roller 14. Etc. are included. The leading edge of the printing paper sent by the timing roller 50 is temporarily captured on the back pressing roller 14 by the clamp 51 provided on the back pressing roller 14.

Reference numeral 52 denotes a paper discharge section, which is a pinch roller for holding the printed printing paper coming out of the sandwiched region between the printing drum 10 and the back-pressing roller 14 for a while while adhering to the back-pressing roller 14. 54 and the clamp 51 are the pinch rollers 5
After releasing the front end of the printing paper after passing position 4, the peeling claw 55 for peeling the printing paper from the back-pressing roller 14 is released, and then the paper ejecting roller 56 for giving a flying force to the printing paper in the paper ejection direction. It includes a paper ejection guide 57, a paper ejection tray 58 for receiving the printing paper flying out of the paper ejection ejection guide, and the like.

Reference numeral 60 denotes a plate discharge device for stripping the used stencil sheet from the printing drum 10 and discharging the plate, which is a direct object of the present invention. The plate ejection device 60 is shown in more detail in FIG. In FIG. 2, an arc-shaped contour 6
Reference numeral 1 is a trajectory along which the outer surface of the crossbar 16 of the printing drum 10 shown in FIG. 1 moves as the printing drum 10 rotates. A peeling claw 62 is arranged in the vicinity of the arcuate locus, so that when the printing drum 10 is gently rotated in the counterclockwise direction in the drawing for plate ejection, the clamp 18 is already moved.
Is opened and scooped up on the starting end of the stencil sheet in a state where it is freely placed on the outer surface of the crossbar 16, and the stencil feed roller 6
It is designed to be caught between 4 and 66. The plate discharge feed rollers 64 and 66 respectively rotate in the clockwise direction and the counterclockwise direction in the figure, and in synchronization with the rotation of the printing drum 10, the stencil sheet 24 is stripped from its outer peripheral surface, and the plate discharge storage chamber of the plate discharge rotor 68 is removed. It is sent into 70 as shown. The plate discharge rotor 68 is provided with four such plate discharge storage chambers 70, and its rotating shaft 72 rotates 1/4 rotation every time one plate is stored. When the discharge of one stencil sheet is completed and the stencil sheet is housed in one stencil sheet storage chamber 70, the stencil sheet discharge rotor 68 is rotated by 1/4 and is folded and folded in the stencil sheet storage chamber 70 in the meantime. The stencil sheet stored in (1) is scraped out of the plate discharge storage chamber by the plate discharge guide 73, and is collected at the plate discharge inlet 76 of the plate discharge box 74. Next, the plate discharge compression arm 78 is rotated in the clockwise direction in the figure by the rotating shaft 80, and the folded plate of the stencil sheet accumulated in the plate discharge inlet 76 is compressed and pushed into the plate discharge box 74.

Reference numeral 82 denotes a plate discharge confirmation means, which is a light reflection type sensor for detecting whether or not the stencil sheet exists on the exit side of the sandwiched portions of the plate discharge feed rollers 64 and 66.

Reference numeral 84 denotes a plate discharge box installation detecting means such as a limit switch for detecting whether or not the plate discharge box 74 is arranged at a predetermined position on the pedestal 86.

Reference numeral 88 denotes a stencil box for detecting whether or not there is a predetermined amount (preferably zero) or more of the stencil sheet in the stencil box 74 when the stencil box 74 is arranged at a predetermined position on the pedestal 86. The internal detection means may be a light-reflective sensor. In the illustrated embodiment, by detecting whether or not there is a stencil sheet that blocks light from the sensor near the bottom of the stencil box 74. It is designed to detect whether or not the stencil box is almost completely empty. These detection devices 82, 8
The operation of 4, 88 will be described in detail below.

FIG. 3 is a schematic view showing a control means using a microcomputer for controlling the operation of the plate discharging apparatus according to the present invention. The illustrated microcomputer 100 includes a central control unit (CPU) 102, a read only memory (R).
OM) 104, random access memory (RAM) 10
6, an input port device 108, an output port device 110, and a bidirectional common bus 112 for connecting them to each other, which is of a structure well known in the art and is shown in FIG. It controls the entire printing machine, and the input port device 108 and the output port device 110 are connected with a large number of signal transmitting means and signal receiving means other than the signal transmitting means and signal receiving means shown in FIG. However, in FIG. 3, only those involved in the plate discharge device 60 are shown. That is, in the microcomputer 100, it is determined whether the stencil sheet is present at the exit of the stencil sheet feeding rollers 64 and 66 by the stencil sheet checking means 82, that is, the stencil sheet is smoothly peeled off from the printing drum 10 by the peeling claw 62 at the time of sheet ejection. A signal relating to whether the plate has been sandwiched between the feed rollers 64 and 66 and the plate discharge has been started is input, and the plate discharge box setting detection means 84 outputs the plate discharge box 7.
No. 4 is installed at a predetermined position, and a signal relating to whether or not there is a stencil sheet exceeding a predetermined amount in the plate discharge box 74 is input from the plate discharge box internal detection means 88. Further, a command signal for driving the printing drum 10 is issued from the output port device 110 upon plate ejection, and a command signal for operating the plate ejection feed rollers 64 and 66 upon plate ejection is directed to these plate ejection rollers. A signal for operating the plate discharge rotor 68 and the plate discharge compression arm 78 is transmitted in synchronization with the plate discharge.

The operation of the plate discharging apparatus of the present invention performed under the control of the microcomputer 100 will be described below as a series of steps with a flowchart.

In FIG. 4, it is assumed that the stencil printing machine is in a state where printing by one stencil is completed. Here, if the judgment result in step 1 for judging whether the plate-making signal for the next printing is issued is YES, the following step 2
Then, the clamp 18 is opened, and the plate discharge feed roller 64,
66 is started. After a lapse of a predetermined time from this, when step 3 is passed, low speed rotation for discharging the printing drum 10 is started in step 4. Next, as the printing drum rotates, the start end of the stencil sheet is separated by the separating claw 62, and if the stencil sheet is smoothly discharged by the plate discharge feed rollers 64 and 66 starting at the start end, the plate discharge confirming means 82 causes the stencil sheet to be checked. When it is confirmed in step 5 that the rotational position of the printing drum has reached the first detection position where the existence can be confirmed, it is judged in step 6 whether the plate discharge confirmation means 82 has confirmed the plate discharge. It If the determination result in step 6 is YES, then in step 7, the stencil box management process is executed. This stencil box management process will be described later in detail with reference to FIG. When the plate discharge box management process is completed, it is confirmed in step 8 that a predetermined time required for stripping one sheet of the base paper from the printing drum 10 and ending the plate discharge is completed.
Is rotated 1/4, and then in step 10, the plate discharge compression arm 78 is reciprocated once to complete one plate discharge process.

If, for some reason, the plate discharge by the peeling claw 62 and the plate discharge feed rollers 64 and 66 does not start as scheduled, that is detected by the plate discharge confirmation means 82 in step 6, and the plate discharge process proceeds to step 1
In step 12, when the printing drum 10 passes through one rotation, the plate discharge process is performed again, and the printing drum reaches the second detection position corresponding to the first detection position with a delay of one rotation. The plate ejection confirmation unit 82 confirms the plate ejection again. If the plate discharge is confirmed here, the plate discharge process proceeds to step 7, and the plate discharge process is continued as described above. However, if the plate discharge confirmation is not made again in step 12, an error signal is issued because there is some trouble with respect to the plate discharge, and the plate discharge process is temporarily stopped.

FIG. 5 is a flow chart showing an embodiment of the stencil box management process in step 7 of FIG. When the stencil box management process starts, step 10
At 1, the count value C in the count memory in the microcomputer 100 is incremented by 1 for each plate discharge process. The count value C is initially reset to zero. Next, at step 102, a value N corresponding to the number of plate discharges when the inside of the plate discharge box 74 is almost filled with the discharged stencil sheet.
It is determined whether or not the count value C has reached, and the stencil box management process ends here until C reaches N. When it is determined in step 102 that the count value C has reached N, the next plate making is prohibited in step 103, and then in step 104, the message "Please discard the master of the stencil box" is displayed. 1 is displayed in the control window of the stencil press. After that, in step 105, the plate discharge box installation detecting means 84 is placed at a predetermined position on the receiving table 86.
It is detected whether or not 4 is installed. As long as the stencil box is in place, the control process is step 104.
Return to and continue display 1. Once the stencil box is removed,
The control process proceeds to step 106, extinguishes display 1 and then proceeds to step 107 to display display 2 "Set stencil box" in the control window,
The control process proceeds to step 108. Step 108
Then, it is detected whether the stencil box is installed in the predetermined position,
A signal will continue to be issued prompting the stencil box to be reset until the removed stencil box is returned in place.

If it is detected in step 108 that the stencil box is in place, the control process proceeds to 109 to turn off indicator 2 and then to step 110.
The residual state of the stencil sheet in the stencil box is detected by the stencil box internal detection means 88. If it is confirmed that there is not more than a predetermined amount of stencil paper in the stencil box, the control process proceeds to 11
The process proceeds to 1 and the count value C is reset to zero, and then at step 112, the prohibition of plate making is released.

As long as the presence of more than a predetermined amount of stencil paper in the stencil box is detected in step 110, the control process returns to step 104 and display 1 is displayed to prompt removal of the stencil paper in the stencil box.

Thus, according to the above-described embodiment, if an empty stencil box is installed first (that is, at the first start after the stencil printer is connected to the power supply), the stencil box will be full thereafter. Then, the count value C reaches a predetermined count value N, a display prompting to remove the stencil sheet in the stencil box is displayed on the control window, the stencil sheet is removed from the stencil box, and the stencil box is set at a predetermined position of the stencil sheet discharging device. Even when the paper is returned, if the base paper has not been sufficiently removed from the stencil box, the count value C is not reset, and a display prompting the user to remove the stencil paper from the stencil box is continuously issued. Since the prohibition continues, when the stencil sheet is removed from the stencil box, the stencil sheet is not removed sufficiently, which causes a problem that the stencil sheet overflows from the stencil sheet in the subsequent operation of the stencil printing machine. Surely prevent It is.

Before the count value C reaches the predetermined count value N, the stencil box is removed from the predetermined position for maintenance or inspection, and the stencil sheets accumulated in the stencil box until then are left as they are. Even if the plate discharge box is returned to the original predetermined position, the count value C is not reset and continues counting after the previous count value. Therefore, the count of the plate discharge number is continued normally, and the count value C is When the predetermined count value N is reached, a display prompting the removal of the stencil sheet from the stencil box is normally issued.

Although the present invention has been described above in detail with reference to one embodiment, it will be apparent to those skilled in the art that various modifications can be made to the embodiment within the scope of the present invention.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of a stencil printing machine incorporating a plate discharge device according to the present invention.

FIG. 2 is a schematic sectional view showing the configuration of the plate discharge device shown in FIG. 1 in more detail.

FIG. 3 is a system diagram showing a configuration of a control device for the plate discharge device.

FIG. 4 is a flowchart showing the operation of the plate discharge device in a series of operation steps.

5 is a flowchart showing a series of operation steps performed in the stencil sheet ejection box management process in the flowchart of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Printing drum 12 ... Inking roller 14 ... Backing roller 16 ... Yokogi 18 ... Clamp 20 ... Plate making part 22 ... Roll of stencil base paper 24 ... Stencil base paper 28 ... Cutter 30 ... Original reading part 32 ... Light source 34 ... Photo diode 36 ... Rail 38 ... Glass plate 40 ... Original reading head 42 ... Printing paper supply unit 44 ... Paper feeding table 46 ... Printing paper take-out roller 48 ... Printing paper separating roller 50 ... Timing roller 51 ... Clamp 52 ... Paper ejection unit 54 ... Pinch roller 55 ... Peeling claw 56 ... Paper ejection skipping roller 57 ... Paper ejection skipping guide 58 ... Paper ejection table 60 ... Plate ejection device 61 ... Trajectory 62 ... Peeling claw 64, 66 ... Plate ejection feed roller 68 ... Plate ejection rotor 70 ... Plate ejection storage chamber 72 ... Rotation shaft 73 ... Plate discharge guide 74 ... Plate discharge box 76 ... Plate discharge inlet 78 ... Plate discharge compression arm 80 ... Rotation shaft 82 ... Plate discharge Detecting means 84 ... Rejection box installation detection means 86 ... Receptacle 88 ... Rejection box internal detection means 100 ... Microcomputer 102 ... Central control unit 104 ... Read-only memory 106 ... Random access memory 108 ... Input port device 110 ... Output port device 112 … Common bus

Claims (3)

[Claims] 1. A stencil box, a stencil sheet feeding means for stripping a used stencil sheet from the outer peripheral surface of a printing drum and sending it into the stencil sheet box, and a stencil sheet counting means for counting the number of stencil sheets discharged by the stencil sheet feeding means. A stencil sheet removal instruction means for urging the stencil sheet to be removed from the stencil sheet box, and each time a predetermined number of stencil sheet sheets are accommodated in the stencil sheet box, the stencil sheet box is removed from the installation position, A stencil sheet of a stencil printing machine configured to remove the stencil sheet accumulated inside the stencil sheet and return the stencil box to the installation position. A stencil ejector for a stencil printing machine, comprising stencil sheet interior detection means for detecting whether or not a stencil sheet exceeding a certain amount is present. 2. A plate discharge device for a stencil printing machine according to claim 1,
The stencil box has an opening, and the stencil box internal detection means is means for inspecting the internal state of the stencil box from the outside of the stencil box through the opening in a non-contact manner. Plate discharge device for stencil printing machine. 3. A stencil box, a stencil sheet feeding means for stripping a used stencil sheet from the outer peripheral surface of a printing drum and sending it into the stencil sheet box, and a stencil sheet counting means for counting the number of stencil sheets discharged by the stencil sheet feeding means. A stencil removal instruction means for urging the stencil sheet to be removed from the stencil box, a stencil box installation detecting means for detecting whether or not the stencil box is installed at a predetermined position, and a predetermined amount in the stencil box. The stencil sheet has an internal detection means for detecting whether or not there is a stencil sheet exceeding the stencil sheet, and a count reset means for resetting the stencil sheet counting means, and the stencil sheet is discharged when a predetermined number of stencil sheet is counted by the stencil sheet counting means. Removal instruction means prompts to remove the stencil sheet from the inside of the stencil box, and then the stencil box installation detecting means detects that the stencil box is installed at a predetermined position and the inside of the stencil box. Plate discharge device of the stencil printing machine in which the counting reset means when the stencil sheet is detected to be absent for the detecting means exceeds a predetermined amount to said plate discharge box in which is characterized in that resetting the discharged stencil counting means.