JPH06255226A - Screen printing machine - Google Patents

Abstract

PURPOSE:To prevent the operation of a screen printing machine in such a state that the leading end cut piece of stencil paper remains on a feed passage and to issue the warning showing the above mentioned state to a user. CONSTITUTION:A stencil paper standby state sensor 45 detecting whether stencil paper is present on the side of a plate cylinder of the stencil paper cutter 29 provided to a stencil paper feed passage is provided and the stencil paper is cut by the stencil paper cutter when new stencil paper is set and the control outputting a stencil paper cut piece removing warning signal until the detection state of the stencil paper standby state sensor 45 becomes a stencil paper absence detection state after the cutting of the stencil paper and preventing the execution of next operation processing is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine,
In particular, the present invention relates to a stencil printing apparatus which cuts a continuous sheet-shaped stencil sheet into a predetermined length by a stencil sheet cutting means and uses it.

[0002]

2. Description of the Related Art A continuous sheet-shaped stencil sheet is wound around and mounted on an outer peripheral surface of a plate cylinder, and the stencil sheet is cut into a predetermined length by a stencil cutting means provided in a conveying path of the stencil sheet to the plate cylinder. A stencil printing machine configured as described above is known, and is disclosed in, for example, Japanese Utility Model Publication No. 4-18867.

In the stencil printing apparatus as described above, the stencil sheet detecting means detects that a new stencil sheet has been set, and the stencil sheet is detected by the stencil sheet set detecting means. Initial setting of the stencil sheet is performed so that the leading edge of the stencil sheet is cut so that the leading edge of the stencil sheet is located at a predetermined position.

[0004]

When the initial setting operation of the stencil sheet is carried out as described above, the cut pieces at the leading end of the stencil sheet remain in the conveying path, which must be removed by the user's hand. If this work is forgotten and the stencil printing machine is operated, the stencil sheet will not be conveyed properly due to the tip cutting pieces of the stencil sheet remaining in the conveying path, and the tip cutting pieces will be the outer peripheral surface of the plate cylinder. May cause printing defects.

The present invention has been made by paying attention to the above-mentioned problems in the conventional stencil printing apparatus, and the stencil printing apparatus in the state where the tip cut piece of the stencil sheet remains in the conveying path. It is an object of the present invention to provide an improved stencil printing apparatus that prohibits the operation of the stencil sheet and also warns the user that the front cut piece of the stencil sheet is in the transport path.

[0006]

According to the present invention, a continuous sheet-shaped stencil sheet is wound around and mounted on an outer peripheral surface of a plate cylinder, and the stencil sheet is provided in a conveying path for the plate cylinder. In the stencil printing apparatus configured to cut the stencil sheet into a predetermined length by the stencil sheet cutting means, whether the stencil sheet exists on the plate cylinder side of the transport path from the stencil sheet cutting means. The stencil sheet detecting means for detecting the presence or absence of the stencil sheet, the stencil sheet set detecting means for detecting that a new stencil sheet is set, and the cutting of the stencil sheet by detecting that the new stencil sheet is set by the stencil sheet set detecting means. After cutting the base paper, outputs a base paper cut piece removal warning signal and prohibits execution of the next operation processing until the detection state by the base paper presence / absence detection unit becomes the base paper absence detection state. It is accomplished by a stencil printing device according to claim having a Cormorant control means.

[0007]

According to the above construction, a new stencil sheet is set, and when this is detected by the stencil sheet set detecting means, the stencil sheet cutting means cuts the stencil sheet.
After the stencil sheet is cut, the stencil sheet removal warning signal is output and the next operation is performed until the detection state by the stencil sheet presence detecting unit becomes the stencil sheet absence detection state, that is, until the front cutting piece of the stencil sheet is removed from the transport path. Execution of processing is prohibited.

[0008]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

1 and 2 show an embodiment of a stencil printing apparatus according to the present invention. In these figures, reference numeral 1 indicates a cylindrical plate cylinder. The plate cylinder 1 has, on the outer peripheral surface thereof, a base paper clamp piece 5 that cooperates with the stage surface portion 3 to clamp the stencil base paper S, and is driven to rotate clockwise in the drawing by an electric motor (not shown).

On the left side of the plate cylinder 1 in the drawing, there is provided a base paper roll holding portion 7 for holding a roll body R of a continuous sheet stencil base paper S in a replaceable manner.

Between the base paper roll holder 7 and the plate cylinder 1,
Base paper guide lower plate 9 and thermal bed 11 paired up and down
And a platen roller 13, a base paper inlet passage 19 constituted by a base paper guide lower plate 15 and a base paper guide upper plate 17 which are paired with each other, and a pair of upper and lower base paper conveying rollers 21 provided in the middle of the base paper inlet passage 19. , 23, a base paper cutter 29 composed of a fixed blade 25 and a movable blade 27 which are paired up and down, and a base paper outlet passage 35 which is composed of a base paper guide lower plate 31 and a base paper guide upper plate 33 which are paired up and down. Are arranged in order.

The above-mentioned base paper guide lower plate 9 and platen roller 1
3, base paper guide lower plate 15, base paper guide upper plate 17, base paper conveying roller 23, fixed blade 25, movable blade 27, base paper guide lower plate 3
1. The base paper guide upper plate 33 is mounted on a body frame (not shown), but the thermal bed 11 and the base paper conveying roller 21 are mounted on a pressure plate cover 39 which is vertically openable and closable by a pivot 37. , The platen roller 13 and the base paper conveying roller 23 are brought into contact with and separated from each other.

The stencil base paper S is provided at the arrangement portion of the base paper guide lower plate 15.
A base paper presence / absence sensor 41 (base paper set detection means) for detecting the presence / absence of a pressure plate and a pressure plate set switch 43 for detecting that the pressure plate cover 39 is in the closed position as shown in FIG. 1 are provided.

In the middle of the raw paper outlet passage 35, there is provided a raw paper standby sensor 45 which serves as a raw paper presence detecting means for detecting the presence of the stencil S.

FIG. 3 shows an embodiment of a control system of the raw paper supply unit of the stencil printing machine having the above-mentioned structure. This control system is composed of a microprocessor, etc.
PU51, ROM53 which stored the control program,
RAM 55 that stores input information, timer measurement values, etc. as needed
With a base paper presence sensor 41 and a pressure plate set switch 4
3. Information is input from each of the base paper standby sensors 45, and operation commands are output to the pulse motor drive circuits 57 and 59, the motor drive circuit 61, and the liquid crystal drive circuit 63.

The pulse motor drive circuit 57 is connected to a light pulse motor 65 for rotating the platen roller 13, and the pulse motor drive circuit 59 is connected to a load pulse motor 67 for rotating the raw paper feed roller 23. A cutter motor 69 for rotating the movable blade 27 is connected to the motor drive circuit 61, and a panel liquid crystal display unit 71 is connected to the liquid crystal drive circuit 63.

The CPU 51 executes the control program,
Basically, it is detected that a new stencil sheet S has been set by the transition of the detection state of the stencil sheet presence sensor 41 from the stencil sheet absence detection state to the stencil sheet detection state, and the pressure plate set switch 43 closes the pressure plate cover 39. When the position is detected, a motor operation command is output to the motor drive circuit 61, and thereafter a base paper cut piece removal warning display command is output to the liquid crystal drive circuit 63, and the base paper standby sensor 45 does not detect the stencil base paper S. Until that is detected, the base paper cut piece removal warning display command is continuously output and the control for prohibiting the execution of the next operation process is performed.

FIG. 4 shows an operation flow of the base paper supply control system of the stencil printing machine according to the present invention. The setting of the roll body R of the stencil base paper S on the base paper roll holding unit 7 is as shown in FIG.
As shown in FIG. 4, the pressure plate cover 39 is rotated upward and opened, and when the roll body R is set, the stencil sheet S is fed out from the roll body R set in the base paper roll holding section 7. Insert the tip of the lever into the base paper entrance passage
The stencil sheet S is manually fed until it reaches the base sheet outlet passage 35 by passing the tip between the fixed blade 25 and the movable blade 27.

When the initial setting of the stencil sheet S is completed,
The detection state of the base paper presence / absence sensor 41 transits from the base paper absence detection state to the base paper presence detection state (step 10), and then the pressure plate set switch 43 is turned on, that is, the pressure plate cover 39 is shown in FIG. The return to the original closed position is monitored (step 20).

When the pressure plate setting switch 43 is turned on, it is then determined whether the stencil sheet waiting sensor 45 is turned on, that is, whether the stencil sheet S is manually fed to the position where the stencil sheet waiting sensor 45 is placed (step 30). .

If the base paper standby sensor 45 is not on, the process proceeds to step 110, where the base paper standby sensor 4
If 5 is on, pulse motor drive circuit 5
The motor operation command based on the first predetermined number of pulses is output to 7, 59.

As a result, the write pulse motor 65 and the load pulse motor 67 are rotationally driven with the first predetermined number of pulses, and the platen roller 13 and the base paper transport roller 23 are rotated to feed the stencil base paper S by a predetermined amount (step 4).
0). The predetermined amount of the stencil sheet S is fed here in order to secure a length sufficient to remove the tip cut piece of the stencil sheet S later by hand, and the feeding length is 5 to 10 m.
It may be about m.

When the feeding of the stencil sheet S is completed, a motor operation command is output to the motor drive circuit 61. As a result, the cutter motor 69 is rotationally driven, and the stencil sheet S is sheared by the movable blade 27 and the fixed blade 25 (step 50).

When the cutting of the stencil sheet S is completed, a command for removing the cut sheet of the stencil sheet is output to the liquid crystal drive circuit 63. As a result, a warning for removing the cut pieces of the base paper is displayed on the panel liquid crystal display section 79 (step 60).

When the raw paper cut piece removal warning is displayed on the panel liquid crystal display 79, it is monitored that the raw paper standby sensor 45 is turned off. Unless the raw paper standby sensor 45 is turned off, step 60 is performed. Then, the execution of the next operation process is prohibited (step 70).

As a result, until it is detected that the stencil sheet S is not present, that is, the tip cut piece of the stencil sheet S is in the stencil outlet passage 3
Until it is removed from step 5, the panel liquid crystal display portion 79 displays a raw paper cut piece removal warning and prohibits execution of the next operation process.

When the base paper standby sensor 45 changes to the off state, it waits for the next predetermined time, for example, about 1 second (step 80). It is confirmed that it is in the off state (step 90), and if the base paper standby sensor 45 is in the off state here, the process proceeds to the next operation processing step.

If the stencil sheet standby sensor 45 is not in the off state at the time when a predetermined time has elapsed, the stencil sheet S is not properly removed from the stencil sheet outlet passage 35, and the stencil sheet is not yet removed from the stencil sheet outlet passage. 35, the process returns to step 60, and the panel liquid crystal display 79 continues to display the raw paper cut piece removal warning and prohibit the execution of the next operation process.

If the base paper standby sensor 45 is in the off state when the predetermined time has elapsed, the process proceeds to the next operation processing step, and the display of the base paper cut piece removal warning by the panel liquid crystal display unit 79 is canceled (step 100).

Next, to the pulse motor drive circuits 57 and 59, 1
Outputs a motor operation command by pulse drive. As a result, the write pulse motor 65 and the load pulse motor 67 are rotationally driven by one pulse each, and the platen roller 13,
The stencil sheet S is pitch-fed by the rotation of the stencil feed roller 23. (Step 110).

Then, it is monitored that the stencil sheet standby sensor 45 is turned on while the stencil sheet S is being fed, that is, that the leading edge of the stencil sheet S reaches the arrangement position of the stencil sheet standby sensor 45 (step 120). ).

When the base paper standby sensor 45 is turned on and it is detected that the leading edge of the stencil base paper S has reached the position where the base paper standby sensor 45 is arranged, the pulse motor drive circuit 57,
A motor operation command based on the second predetermined number of pulses is output to 59.

As a result, the write pulse motor 65 and the load pulse motor 67 are rotationally driven with the first predetermined number of pulses, and the platen roller 13 and the base paper transport roller 23 are rotated to feed the stencil base paper S by a predetermined amount (step 13).
0). Here, the stencil sheet S is fed by a predetermined amount in order to prevent the stencil sheet standby sensor 45 from being turned off due to curling of the leading end of the stencil sheet S due to moisture absorption or the like. The length may be on the order of 2-5 mm.

The operations of steps 110 to 130 described above are as follows.
In the determination in step 30, the base paper standby sensor 45
Is not turned on, that is, the stencil sheet S is not manually fed to the position where the stencil sheet standby sensor 45 is arranged,
This allows the stencil sheet S to reach the position where the sheet standby sensor 45 is arranged.
If the sheet is not manually fed, the leading end of the stencil sheet S is located at a predetermined position without being cut wastefully.

In this operation flow, when the stencil sheet S is not manually fed to the arrangement position of the stencil sheet standby sensor 45, the initial cutting of the leading end of the stencil sheet S is not performed, but the stencil sheet S is not cut. If it is necessary to perform the initial cutting of the leading end without fail due to the leading end state, etc., when the base paper standby sensor 45 is in the OFF state in the determination in step 30,
After the base paper feed is performed until the base paper standby sensor 45 is turned on (steps 110 and 120), the process returns to step 40, and in any case, the initial cutting of the front end of the stencil base paper S may be performed.

[0036]

As can be understood from the above description, according to the stencil printing apparatus of the present invention, a new stencil sheet is set, and when this is detected by the stencil sheet set detecting means, the stencil sheet cutting means is used. The stencil sheet is cut and the stencil sheet removal warning signal is output and the execution of the next operation process is prohibited until the tip cut piece of the stencil sheet is removed from the transport path after the stencil sheet is cut. A warning is given to the user that the leading edge cut piece of the stencil is in the transport path, and the stencil printing machine is prevented from operating with the leading edge cut piece of the stencil sheet remaining in the transport path. The stencil printing machine will not be operated in a state where the work of removing the front cutting piece of the stencil paper is forgotten.

[Brief description of drawings]

FIG. 1 is a side view of a stencil printing machine according to an embodiment of the present invention with its pressure plate cover closed, showing its essential parts.

FIG. 2 is a side view of an embodiment of the stencil printing apparatus according to the present invention in a state where a pressure plate cover is open, showing a main part thereof.

FIG. 3 is a block diagram showing an embodiment of a control system of a raw paper supply unit of the stencil printing machine according to the present invention.

FIG. 4 is a flowchart showing an operation flow example of a base paper supply control system of the stencil printing apparatus according to the present invention.

[Explanation of symbols]

 1 plate cylinder 11 thermal bed 13 platen roller 19 raw paper inlet passage 21 raw paper transport roller 23 raw paper transport roller 29 raw paper cutter 35 raw paper exit passage 39 pressure plate cover 41 pressure plate set switch 45 pressure plate set sensor 51 CPU 65 light pulse motor 67 Load pulse motor 71 LCD panel

Claims (1)

[Claims] 1. A continuous sheet-shaped stencil sheet is wound around and mounted on an outer peripheral surface of a plate cylinder, and the stencil sheet is cut into a predetermined length by a stencil sheet cutting means provided in a conveying path of the stencil sheet to the plate cylinder. In the stencil printing apparatus configured as described above, a stencil sheet presence detection unit that detects whether or not a stencil sheet is present on the side of the plate cylinder from the stencil sheet cutting unit in the transport path, and a new stencil sheet is set. And a stencil sheet detection device that detects that a new stencil sheet has been set by the stencil sheet set detection device, and the stencil sheet is cut after the stencil sheet is cut. A control means for outputting a base paper cut piece removal warning signal until the detection state is reached and for controlling execution of the next operation processing. Edition printing device.