JPH02274Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to an automatic plate discharge device for automatically peeling off used base paper from a rotating drum in a stencil printing machine.

Prior Art In general, in a stencil printing machine, the work of manually peeling off used base paper from a rotating drum involves the risk of staining hands and clothes with ink because the base paper is wrapped around the drum due to the adhesive force of the ink. This is a highly disliked task.

The device shown in FIG. 1 is a conventional automatic plate ejection device that was developed in view of the problems described above when peeling used base paper from the drum.
are arranged close to each other, and their tips are positioned near the outer peripheral surface of the drum 5, so that as the drum 5 rotates, the claw 1 enters between the base paper 2 and the drum 5, and the base paper 2 is moved to the drum 5. The paper is peeled off from the paper, and then sandwiched between rollers 3 and 4 and sent to a discharge section (not shown).

However, in the conventional automatic plate ejecting device as described above, (1) the gap between the tip of the claw 1 and the outer periphery of the drum must be adjusted very precisely, making maintenance extremely troublesome; The base paper may get caught at the tip of the claw or get stuck and cannot be peeled off smoothly, resulting in jamming at the tip of the claw 1, or (3) the paper may get stuck between the tip of the claw 1 and the base paper clamp part of the drum 5. It has various drawbacks, such as the fact that it is very troublesome to adjust the timing of the operation of the claws 1 in order to prevent interference.

Purpose This invention was made in order to eliminate the drawbacks of the conventional automatic plate ejection device mentioned above, and it is possible to perform reliable automatic plate ejection using only the plate ejection roller without using any claws. The object of the present invention is to provide an automatic plate ejecting device for a stencil printing machine.

Configuration This invention will be explained below based on the embodiment shown in the drawings.

In FIG. 2 or 3, the stencil paper 2 is close to the rotating drum 5 wrapped around it by the adhesive force of the ink, and the arm 11 is pivoted on the main body frame so as to be parallel to the axis of rotation of the rotating drum 5. Axis 1
The arm 11 is attached to the arm 11 so as to be swingable about the shaft, and the tip is biased in a direction toward the drum 5 by a spring 13 interposed between the rear end of the arm 11 and the main body frame. has been done. A discharge roller 7 is rotatably attached to the shaft 10, and a rotary shaft 15 is fitted into a long hole 14 bored along the longitudinal direction at the distal end of the arm 11, and the peeling roller 8 is attached to the shaft 10. The discharging roller 7
is pressed against. Further, the discharge roller 7 or the peeling roller 8 is connected to a drive device via a gear device (not shown), and is configured to rotate in the direction of arrow A in the figure.

The arm 11 is configured such that the peeling roller 8 is locked in a state separated from the drum 5 by a hook 12 that is swingably attached to the main frame near the tip thereof. Note that 6 is a portion on which the edge of the base paper rides up to prevent the base paper 2 from being sticky with ink.

During the printing process, the automatic plate ejecting device described above locks the distal end of the arm 11 with a hook 12, and the peeling roller 8 is attached to the drum 5, as shown in FIG.
When printing is finished, hold it away from the
Rotate the hook 12 in the direction of arrow B in the figure to disengage it from the arm 11. Then, the arm 11 is urged by the spring 13 and swings around the shaft 10, the peeling roller 8 is pressed against the drum 5, and the peeling roller 8 is swung in the direction of arrow A by the drive device. As shown in FIG. 3, the rotational direction of the peeling roller 8 is the same as the paper discharge rotation direction C of the drum, and the peeling roller 8 and the drum 5 are rubbed together at the contact portion.

When the base paper riding part 6 of the drum 5 comes into contact with the peeling roller 8, as shown in FIG. a) is scooped up by frictional resistance with the peeling roller 8 and peeled off from the outer peripheral surface of the drum 5. Then, by the rotation of the peeling roller 8, the end of the base paper 2 is guided to the contact portion between the discharge roller 7 and the peeling roller 8, as shown in FIG. 5, and is sandwiched therebetween. Then, the base paper 2 is peeled off from the drum 5 by the rotation of the discharge roller 7 and the peeling roller 8, and is discharged to the plate discharge box 16.

Note that while the raw paper 2 is being discharged by the discharge roller 7 and the peeling roller 8, the arm 11 is swung against the biasing force of the spring 13 by a device such as a cam (not shown), and the peeling is performed. The roller 8 is separated from the drum 5, the tip of the arm 11 is engaged with the hook 12, and the standby state shown in FIG. 2 is returned.

Further, the peeling roller 8 is made of a material such as rubber or sponge that has a high coefficient of friction against the stencil paper 2, and in order to ensure the scooping up of the stencil paper, tooth profiles may be formed on the outer peripheral surface. is also valid.

Effects As described above, this invention uses the frictional force of the peeling roller to peel the base paper from the rotating drum.
Since the release roller is in pressure contact with this peeling roller, the plate is ejected by being pinched, so compared to conventional plate ejection devices that use claws, it is easier to adjust, there is very little paper jam during plate ejection, and the plate is ejected reliably. It has an excellent effect in that it can be carried out.

[Brief explanation of the drawing]

FIG. 1 is a schematic side view showing a conventional automatic plate ejection device, FIG. 2 is a schematic side view showing an embodiment of this invention in a standby state, FIG. 3 is a schematic side view showing the same embodiment in an operating state, and FIG. 4 and 5 are explanatory diagrams showing the state of discharge of the original paper in the same embodiment. 2...Base paper, 5...Rotating drum, 7...Ejection roller, 8...Peeling roller, 10...Shaft, 11...
Arm, 12... Hook (holding member) 13... Spring.

Claims (1)

[Scope of utility model registration request] An arm is attached near the outer peripheral surface of the rotating drum of a stencil printing machine so that it can swing freely by a shaft that is parallel to the rotation axis of the rotating drum, and the tip of the arm approaches the drum, and the tip of this arm is attached to the arm that can be rotated freely. a peeling roller attached to the base paper, the arm being oscillated to come into pressure contact with the rotating drum when the base paper is discharged; a drive device that rotates in the same direction; a discharge roller that is pivotally supported on a main body frame and that pinches and discharges the peeled base paper in pressure contact with the peeling roller; and the arm is held in a state where the peeling roller is separated from the rotating drum. An automatic plate ejection device for a stencil printing machine, characterized in that it has a holding member.