JPH0952425A - Stencil printer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To peel off used base paper for stencil printing easily from a printing drum without staining hands. SOLUTION: When a plate discharging box 11 is fitted to a plate discharging part of a stencil printer, a plate discharge detecting means 15 starts rotation of a printing drum 1. A plate-discharging roller 12b in contact with an outer peripheral surface of the printing drum 1 together with a plate discharging roller 12a takes base paper for stencil printing 6 into an inner direction of the plate discharging box 11. An extruding cam 13 provided to the printing drum 1, after the base paper for stencil printing 6 is stored in the plate discharging box 11, extrudes the plate discharging box 11. When the plate discharge detecting means 15 detects extrusion of the plate discharging box 11, rotation of the printing drum 1 is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary type stencil printing machine, and more particularly to a stencil printing machine which can easily discharge a used stencil printing base paper from a printing drum.

[0002]

2. Description of the Related Art A stencil printing machine is provided with a cylindrical printing drum having an ink passing mechanism on the outer periphery thereof, and an image-perforated stencil printing base paper partially surrounds the printing drum. It is designed to be wound while being locked to the upper clamp piece. In addition, printing ink is held inside the printing drum.

When printing with this stencil printer,
A state in which the user of the device has previously perforated an image on the stencil printing paper, and the holes in the mount portion at one end of the stencil printing paper are engaged with the pins provided on the clamp portion of the printing drum. By operating the rotation switch to rotate the printing drum, the stencil sheet can be wound around the printing drum.

Next, when printing is performed, the printing drum is rotated by operating the printing start switch, and the printing paper is fed from the place where the printing paper is stored to the vicinity of the printing drum. It is like this. The device is equipped with a detection mechanism such as a paper sensor that contacts the front edge of the printing paper and detects the position of the printing paper. This detection mechanism is used when the printing paper passes near the printing drum. Then, the pressing mechanism that presses the printing paper against the printing drum is activated.

Therefore, the printing paper is sandwiched between the printing drum and the printing drum by the pressing mechanism and is pressed against the printing drum. At this time, by transferring the printing ink in the printing drum to the printing paper through the stencil printing base paper,
Printing is performed. When printing with a new original in this stencil printer, it is necessary to separate the stencil printing paper after printing from the printing drum and wind the new stencil printing paper around the printing drum. . When peeling the stencil sheet from the printing drum, by rotating the printing drum by operating the rotation switch while the user of the apparatus holds the other end of the stencil sheet by hand, The stencil sheet can be peeled from the printing drum.

[0006]

This stencil printing apparatus is
When the stencil printing base paper is peeled off, if the user of the apparatus does not position the stencil printing base paper properly, the stencil printing base paper may be cut because the stencil printing base paper is thin.
Further, when removing the cut stencil printing base paper, the hands of the user who is using the apparatus are soiled.

Further, the user of the apparatus has to operate the rotary switch for rotating the printing drum while holding one end of the stencil printing paper by hand when peeling the stencil printing paper from the printing drum. There is.

The present invention has been made in order to solve the above problems, and can easily perform the separation of used stencil printing base paper from the printing drum without soiling the hands and discharge the stencil with a simple mechanism. The purpose is to provide a device.

[0009]

In order to achieve the above object, a stencil printing apparatus of the present invention has a printing drum 1 having an ink permeation mechanism in a part thereof and a stencil printing base paper 6 wound around the outer periphery thereof, and a drive drum. A printing drum rotating mechanism that drives the printing drum 1 to rotate by the rotation of a motor; a paper feeding mechanism 4 that feeds the printing paper 3 to the printing drum 1 side in conjunction with the rotation of the printing drum 1; A stencil printing machine having a pressing mechanism (5) for pressing the printing paper (3) onto the printing drum (1) when the paper (3) passes near the printing drum (1) and transferring the ink to the printing paper (3). A plate discharge box 11 which is detachable from the plate unit 10 and is attached to the plate discharge unit 10 every time the used stencil sheet 6 is peeled off.
A plate discharging mechanism which is provided in the plate discharging box 11, contacts the stencil printing base paper 6 on the printing drum 1, and stores the stencil printing base paper 6 in the plate discharging box 11 by the rotation of the printing drum 1. Plate ejection box 1 for plate ejection unit 10
1. A plate discharge detecting unit 15 that detects the mounted state of No. 1 and starts rotation of the printing drum 1 at the time of mounting to start plate discharge.

Further, as described in claim 2, the stencil sheet 6 for stencil printing by the plate discharging mechanism is provided on the rear end side in the rotation direction of the printing drum 1 so as to project at an angular position excluding the ink passage region. After the sheet is housed in the plate discharge box 11, the plate discharge completion mechanism 13 may be provided that contacts the plate discharge box 11 and pushes the plate discharge box 11 out of the plate discharge section 10.

Further, as described in claim 3, the plate discharge mechanism is composed of rotatable plate discharge rollers 12a and 12b which are in contact with the printing drum 1, and the stencil printing is wound around the outer periphery of the printing drum 1. The base paper 6 may be taken in the inside of the plate discharge box 11.

Further, as described in claim 4, the plate discharge detecting means 15 detects the state where the plate discharge end mechanism 13 pushes the plate discharge box 11 out of the plate discharge section 10 and stops the printing drum 1. can do.

The operation of the above construction will be described. When the plate discharge box 11 is set in the plate discharge section 10 of the apparatus, the plate discharge roller 12b provided in the plate discharge box 11 causes the printing drum 1 to move.
In contact with the outer peripheral surface of In this set state, the plate discharge detection means 1
5, the drive motor starts to rotate and the printing drum 1 starts to rotate. At the same time, the plate discharge roller 12a, which is in contact with the plate discharge roller 12b, rotates in conjunction with the rotation of the printing drum 1. The used stencil printing base paper 6 on the printing drum 1 is rotated by the printing drum 1 to come into contact with the plate discharging roller 12b and rotate.
It is taken in toward the inside of the plate discharge box 11 between b and b. Extrusion cam 1 provided so as to project from the printing drum 1
In No. 3, the stencil printing base paper 6 is housed in the plate discharge box 11, and then the plate discharge box 11 is pushed out from the plate discharge section 10.
This state is detected by the plate discharge detection means 15, and the drive motor is stopped to stop the rotation of the printing drum 1.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the stencil printing machine of the present invention will be described below. FIG. 1 is a side view showing a schematic configuration of the device. The printing drum 1 is formed in a cylindrical shape and has an ink passing mechanism on the outer periphery, and holds stencil printing ink inside. A paper feed roller 4 is arranged at one end of the paper feed unit 3 that stores print paper in contact with the print paper. The paper feed roller 4 interlocks with the printing drum 1 by a drive interlocking mechanism to feed the printing paper toward the printing drum 1.

The printing drum 1 is located near the printing drum 1.
A pressing device 5 arranged to press is provided. The pressing device 5 also presses the printing paper fed in association with the printing drum 1 by the drive interlocking mechanism to the printing drum 1 side. A drive motor (not shown) rotates the printing drum 1 and serves as a drive source for operating the drive interlocking mechanism.

When printing is performed by this apparatus, the stencil printing base paper 6 with image perforations is wound around the outer circumference of the printing drum 1. As shown in the perspective view of FIG. 2, the stencil printing base paper 6 is provided with a thick mount portion 7 at one end, and the mount portion 7 has a plurality of engaging holes in the width direction. An opening 7a is formed.

A clamp portion 8 for engaging and holding the mount portion 7 is provided on the printing drum 1, and the clamp portion 8 has a plurality of engaging pins corresponding to the engaging holes 7a of the mount portion 7. 8a. Therefore, when the rotation switch is operated with the engagement pin 8a of the clamp portion 8 engaged with the engagement hole 7a of the mount portion 7, the printing drum 1 rotates and the stencil printing base paper 6 is placed on the printing drum 1. Wrapped around. By the way, in the winding state of the stencil printing base paper 6 shown in FIG. 1, the stencil printing base paper 6 is shown in a state of floating above the printing drum 1, and the mount portion 7 is described thickly. It is in close contact with the printing drum 1 and its thickness is also small.

When the user operates the print start switch, the drive motor is rotated and the printing drum 1 is moved to the arrow C.
Continuous rotation in the direction. Further, the paper feed roller 4 rotates at regular intervals via the drive interlocking mechanism, and the printing paper of the paper feed unit 3 is fed in the direction of the printing drum 1 (direction of arrow A). Further, when the printing paper passes near the printing drum 1,
The pressing device 5 moves in the direction of arrow B and presses the printing paper in the direction of the printing drum 1.

As a result, the stencil printing ink inside the printing drum 1 is transferred to the printing paper through the stencil printing base paper 6 and printing is performed. The printed paper that has been printed is output to the paper output unit 9
To be loaded.

When printing using a new original,
It is necessary to discard the stencil sheet 6 on the printing drum 1. In this case, after setting the feed roller so as not to rotate so as to stop the feeding of the printing paper of the paper feed unit 3, the plate ejection box 11 is installed in the plate ejection unit 10 provided in the apparatus.
The stencil box 11 has a width larger than that of the stencil printing base paper 6, and will be described later.
When it is discarded, it is taken in through the opening 11a and accommodated.

The plate discharge section 10 is formed by cutting out a part of the apparatus in accordance with the shape of the plate discharge box 11, and the plate discharge box 11 can be mounted freely. A plate discharge detecting means 15 for detecting a state in which the plate discharge box 11 is attached to the plate discharge section 10.
Is provided. The detection signal of the plate discharge detecting means 15 outputs different signals when the plate discharge box 11 is mounted and when it is separated, and the drive motor can be rotated at the start of the plate discharge operation based on the mounting state of the plate discharge box 11 Sometimes the drive motor is stopped. The plate discharge detecting means 15 may use a non-contact photosensor in addition to a mechanical switch that contacts the plate discharge box 11 to switch the contact as shown in the figure, and any other device can be used as long as it can detect detachment of the plate discharge box 11. You may use the thing of a structure.

The plate discharge box 11 has an opening 11a at a portion facing the printing drum 1, and a pair of plate discharge rollers 12a and 12b are rotatably provided in the vicinity of the opening 11a with their peripheral surfaces in contact with each other. ing. Further, a part of the peripheral surface of one plate discharging roller 12 b is provided so as to project from the plate discharging box 11.

Therefore, as shown in FIG. 1, the plate discharge roller 12b is in contact with the outer peripheral surface of the printing drum 1 with the plate discharge box 11 stored in the plate discharge section 10. A plurality of plate discharge rollers 12a and 12b are provided at predetermined intervals on a rotary shaft provided in the width direction (depth direction in FIG. 1) of the stencil printing base paper 6, respectively. Also, this plate discharge roller 12
The a and 12b may be composed of a single piece having a width corresponding to the width of the stencil printing base paper 6. Therefore, the plate ejection box 1
In the state in which 1 is stored in the plate discharge section 10, the plate discharge roller 12b contacts the stencil printing base paper 6.

Next, FIG. 3 is a side view showing the plate discharge transmission mechanism 20. The plate discharge transmission mechanism 20 is used for the printing drum 1
It is composed of a gear or the like for transmitting the rotational force of 1 to one plate discharge roller 12a. A gear 2 is provided on one side of the printing drum 1.
1 is formed, and this gear 21 is transmitted from the gear 22 fixed to the device side to the gear 23. This gear 2
3 is provided on one side of the plate discharge box 11 and meshes with a gear 24 fixed to the rotation shaft of the plate discharge roller 12a.

Therefore, the plate discharge box 11 is replaced by the plate discharge unit 1.
When it is mounted at 0, the plate discharge detecting means 15 detects this and the drive motor rotates, and the printing drum 1 rotates in the direction C in the drawing. The rotation of the printing drum 1 causes the plate discharge roller 12a to rotate counterclockwise via the gears 21 to 24 of the plate discharge transmission mechanism 20, and the plate discharge roller 12b to be joined is driven to rotate clockwise.

As a result, the stencil printing base paper 6 in contact with the plate discharge roller 12b is first discharged from the plate discharge roller 1 from the mount portion 7 portion.
The plate discharge rollers 12a and 12b which are wound around 2b and face each other.
It is taken in from the space toward the inside of the plate discharge box 11. When the printing drum 1 makes one revolution, all of the stencil printing base paper 6 wound around the printing drum 1 is discarded and stored inside the plate discharge box 11.

At the rear end portion of the printing drum 1 in the rotational direction (side portion of the clamp portion 8), an extrusion cam 1 as a plate discharge completion mechanism is provided.
3 is provided so as to project by a predetermined amount. Therefore, immediately after the printing drum 1 rotates in the C direction and all of the stencil printing base paper 6 is housed inside the stencil box 11, as shown in the operation diagram of FIG. Will come into contact with the sides. As a result, the plate ejection box 1
1 is pushed outward from the plate discharge portion 10 according to the amount of protrusion of the extrusion cam 13.

At this time, at the same time, the plate discharge roller 12a becomes free from the plate discharge transmission mechanism 20. Further, when the plate discharge box 11 is detached from the plate discharge section 10, the plate discharge detection means 1
5 detects this and stops a drive motor, and rotation of the printing drum 1 stops.

It is optimum that the plate discharge box 11 contacts the extrusion cam 13 after accommodating the used stencil printing base paper 6 and disconnects the driving force transmission between the plate discharge roller 12a and the printing drum 1. Therefore, as shown in FIG. 2, the push-out cam 13 is provided at an angular position deviating from the screen 1a in the ink passage area on the printing drum 1. It needs to be provided on the rear end side in the rotation direction C of the printing drum 1. The push-out cam 13 can be provided at any position on the printing drum 1, and may be provided on a side portion of the printing drum 1 as long as it is in contact with the plate discharge box 11.

In this way, when the stencil printing base paper 6 is discharged, the operator sets the plate discharge box 11 in the plate discharge section 10, and the plate discharge detecting means 15 detects this and the printing drum 1 Is rotated once, and is automatically stopped when the plate discharge box 11 is detached. At this time, the used stencil printing base paper 6 is discarded and stored in the plate discharge box 11, so that the plate discharge operation can be facilitated and the hands are not soiled. Then, the used stencil printing base paper 6 can be collectively discarded by moving the stencil printing box 11 together with a predetermined number of sheets to a disposal site. Further, after the plate discharge box 11 is set on the plate discharge section 10, the drive motor may be rotated by the operation of the operation switch to rotate the printing drum 1.

Further, the stencil printing base paper 6 is the stencil box 1
After being housed in the plate 1, the plate ejection box 11 is repelled from the plate ejection unit 10 by the push-out cam 13, so that the user can easily know the time when the plate ejection is completed. Further, since the drive motor is automatically stopped when the plate discharge box 11 is detached, it is possible to prevent the printing drum 1 from rotating unnecessarily after the plate discharge is completed. After this, the stencil printing base paper 6 that is newly used for printing is wound around the printing drum 1 again, and printing can be performed by the above-described operation.

[0032]

According to the present invention, when the plate discharge detecting means detects that the plate discharge box is attached to the plate discharge section of the apparatus, the printing drum starts to rotate and the plate discharge mechanism provided in the plate discharge box prints. Since the stencil printing base paper on the printing drum is stored in the stencil ejection box, the operator can eject the stencil printing base paper without touching the used stencil printing stencil by simply setting the stencil ejection box. It can be done easily without getting dirty. If the plate discharge mechanism is configured so that the plate discharge roller comes into contact with the printing drum and rotates, the stencil printing base paper can be taken into the plate discharge box by the rotation of the plate discharge roller.

Further, since the plate discharge completion mechanism provided so as to project on the printing drum pushes out the plate discharge box from the plate discharge section after accommodating the stencil printing base paper, the user can easily know when to finish the plate discharge. The transition to the next work can be facilitated. Then, the plate discharge detection means detects that the plate discharge box is pushed out from the plate discharge section and stops the printing drum, thereby preventing unnecessary rotation of the printing drum after the plate discharge is completed.

[Brief description of drawings]

FIG. 1 is a side view showing a stencil printing apparatus of the present invention.

FIG. 2 is a perspective view showing a stencil printing base paper and a printing drum.

FIG. 3 is a side view showing a plate discharge transmission mechanism.

FIG. 4 is a diagram showing an extruding operation of a plate discharge box by an extruding cam.

[Explanation of symbols]

1 ... Printing drum, 3 ... Paper feeding unit, 6 ... Stencil printing base paper,
7 ... Mount part, 8 ... Clamp part, 9 ... Discharge part, 12a, 1
2b ... plate discharge roller, 13 ... extrusion cam, 15 ... plate discharge detecting means, 20 ... plate discharge transmission mechanism, 21-24 ... gears.

Claims (4)

[Claims] 1. A printing drum having a part of an ink permeation mechanism, around which a stencil printing base paper is wound, a printing drum rotating mechanism for rotationally driving the printing drum by rotation of a drive motor, and a printing drum. A paper feed mechanism that feeds the printing paper to the printing drum side in synchronization with the rotation of the drum, and when the printing paper passes near the printing drum, presses the printing paper against the printing drum to transfer the ink to the printing paper. In a stencil printing machine having a pressing mechanism, the stencil printing machine is detachably attached to the stencil printing machine and is attached to the stencil printing machine every time the used stencil printing base paper is peeled off. A stencil printing mechanism that is in contact with the stencil printing base paper on the printing drum and stores the stencil printing base paper in the stencil discharge box by rotation of the printing drum; Detect the condition,
A stencil printing device comprising: a plate discharge detection unit that starts rotation of the printing drum to start plate discharge when mounted. 2. A rear end side in the rotation direction of the printing drum, which is provided so as to project at an angular position excluding an ink passage region, and after the stencil printing base paper by the plate discharging mechanism is housed in a plate discharging box, The stencil printing machine according to claim 1, further comprising a plate discharge completion mechanism that comes into contact with the plate discharge box and pushes the plate discharge box out of the plate discharge portion. 3. The plate discharge mechanism is composed of a rotatable plate discharge roller that comes into contact with the printing drum, and takes in the stencil printing base paper wound around the outer periphery of the printing drum toward the inside of the plate discharging box. The stencil printing apparatus according to claim 1, 4. The stencil printing apparatus according to claim 2, wherein the plate discharge detection means is configured to stop the printing drum by detecting a state in which the plate discharge completion mechanism pushes out the plate discharge box from the plate discharge section.