JPH0298479A - Device for returning rotary drum to normal position - Google Patents

Abstract

PURPOSE:To return a rotary drum to a normal position and stop the drum even when the drum is stopped at an abnormal position due to a failure in a power supply by providing a backup battery, a backup changeover switch, a rotary drum position detecting switch, and a backup connecting circuit. CONSTITUTION:A rotary drum stop position detecting switch 22 is a switch which detects the position of a rotary drum, and is turned OFF or ON according as the drum is in a normal stop position or is in other position. Upon a failure in a power supply, a backup changeover switch 21 is closed. When the drum is stopped at a position other than the normal stop position, the switch 22 is turned ON, whereby a backup motor 16 is connected to a battery. The motor is thereby rotated through a spring clutch 15, and when the drum is brought to the normal position, the switch 22 is turned OFF, so that the drum is stopped at the normal position.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention is capable of restoring the rotary drum to its normal position and stopping the f9 when an unexpected power failure occurs while the stencil rotary press is in operation. This invention relates to a device for returning a rotary drum to its normal position.

(Prior Art) Some well-known rotary stencil presses use a rotary drum having a portion provided with ink permeation holes and a bottomed portion without ink permeation holes.

The stencil paper is wrapped around the outer circumference of this rotary drum and rotates.
Stencil printing is performed using ink supplied to the outside from the ink penetration holes.

In this type of rotary stencil press, ink in the rotary drum accumulates on the inner surface of the ink reservoir at the bottom of the rotary drum when the rotary stencil press is in a normal stop position and inactive.

For this reason, the fixed stop position of the drum is determined, and the rotary drum is stopped with the bottom surface, which does not have ink penetration holes, facing down.

(Problem to be Solved by the Invention) However, when the above-mentioned type of stencil rotary press is stopped and left outside the above-mentioned fixed position due to a power outage or unplugging, there is a possibility that ink may drip from the ink penetration holes. be.

Some conventional stencil rotary presses are equipped with a plate or the like to catch the ink that oozes out in the event of an accident where the rotary drum is stopped outside the normal orientation and ink drips.

If the positioning stops due to a power outage or careless unplugging of the outlet, it may lead to cleaning of dripped ink, ink stains on the rollers, and irreversible contamination of electrical components.

SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary drum return device that can return the rotary drum to the regular position and stop the rotary drum when an unexpected power failure occurs while the stencil rotary press is in operation. .

(Means for Solving the Problems) In order to achieve the above object, the apparatus for returning a rotary drum to a normal position according to the present invention has a part provided with ink permeation holes and a bottomed ink reservoir part without ink permeation holes. In a stencil rotary press that uses a rotary drum, there is a backup battery, a back-up switch that is normally closed when the power is cut off, and a rotary drum stop that detects the stop position of the rotary drum and opens at the normal stop position. a position detection switch, and a backup for rotating a main motor that drives the rotary drum using the bank up changeover switch and the rotary drum stop position detection switch when the rotary drum is not at the normal stop position when the power is turned off. It consists of a connection circuit that connects the motor or the main motor to the backup switching circuit.

(Function) According to the above configuration, even if the rotary drum is stopped in an unfavorable position due to a power failure or the like, the rotary drum can be returned to a normal position where ink does not bleed and the rotary drum can be stopped. .

(Example) Hereinafter, the present invention will be explained in more detail with reference to the drawings.

FIG. 1 is a perspective view of a main part of a first embodiment of a device for returning a rotary drum to a normal position according to the present invention, which uses a backup motor.

FIG. 3 is a circuit diagram corresponding to this embodiment.

FIG. 2 is a schematic diagram for explaining the configuration of the rotary drum.

The rotary drum 10 is shown in detail in FIG.
A portion 10b where ink penetration holes are provided on the surface of the drum 10, and a bottomed ink reservoir portion 10 without ink penetration holes.
I have a.

Ink 11 is housed inside.

A screen (not shown) is wound around the surface of the drum 10, and a stencil paper is wound around the screen for use.

As shown in FIG. 2(B), the state in which the rotary drum 10 has the bottomed ink reservoir portion 10a facing down is the normal stopping position, and the state shown in FIG. 2(C) is a stopping position where ink may protrude by 1ξ.

In the present invention, even if the power supply stops in the unfavorable state shown in FIG. 2(C) due to an accident with the power supply,
Return to position X shown in B) and stop.

In the embodiment shown in FIG. 1, a backup motor 16 that rotates the main motor 1 that drives the rotary drum 10 when the rotary drum 10 is not at the normal stop position when the power is cut off is connected to the bank-up battery. A connection circuit (Fig. 3) is used.

During normal operation, the main motor 1 is normally connected to the power supply circuit 25
(See Figure 3).

The rotational output of the main motor 1 is transmitted to the transmission shaft 6 via gears 2.3, 4.5.

A pulley 7 is provided at the other end of the transmission shaft 6, and power is transmitted via a belt 8 to a pulley 9 provided on the shaft of the rotary drum 10.

The output of the backup motor 16 is spring clutch 7ch 15. It is connected to the shaft of the main motor 1 via an Itl wheel 14.13.

The spring clutch 15 is a clutch that can transmit the rotation from the backup motor 16 to the main motor 1, but does not transmit the rotation from the main motor 1 to the backup motor 16.

As the power supply battery 1, it does not require a very large capacity battery,
Uses dry batteries.

A small capacity rechargeable battery may also be used.

Next, referring to the backup connection circuit shown in FIG. 3, the operation of this circuit and the above embodiment in the event of a power failure will be described.

A bank-up connection circuit 26 connects the backup motor 16. A bank up changeover switch 211 and a rotary drum stop position detection switch 22 are connected in series.

The backup changeover switch 21 is a switch that is closed when a power supply failure occurs, and is normally closed by detecting a voltage drop in the power supply circuit and operating a relay or the like.

The rotary drum stop position detection switch 22 is a switch that detects the position of the rotary drum and is turned off when the rotary drum 10 is at the normal stop position shown in FIG. 2(B) and turned on at other times.

In the event of a power failure, the backup switch switch knob 21
is closed. When the rotary drum 10 is stopped at a position other than the normal stop position as shown in FIG. 2(C), the rotary drum stop position detection switch knob 22 is turned on and the backup motor 16 is connected to the power source.

As a result, the motor 10 is rotated via the spring clutch 15, and when the rotary drum 10 is brought to the normal position, the rotary drum stop position detection switch 22 is turned off, and the rotary drum 10 is stopped at the normal position. .

FIG. 4 is a circuit diagram of a second embodiment of the circuit of the rotary drum home position return device according to the present invention.

Although the above-mentioned embodiment used the backup motor 16,
Main motor 1 is a motor that can be directly driven by a battery (
For example, if it is a DC motor), the backup motor 16
is not necessary.

The backup connection circuit 26 is provided with a bar-no-qua-knob changeover switch 21 and a rotary drum stop position detection switch 22, which are opened and closed by a relay driven by detection of a power outage.

The function of the rotary drum stop position detection switch 22 is the same as that described above, but the hack-up changeover switch 21 is
It has a function of switching and connecting the main motor 1, which is normally connected to the power supply circuit, to the backup connection circuit 26.

If there is a power failure, the backup selector switch 21 is activated. When the rotary drum 10 is stopped at a position other than the normal stop position, as shown in FIG. 2(C),
The rotary drum position detection switch 22 is turned on, and the main motor 1 is connected to the backup power source.

As a result, the main motor 1 is rotated, and when the rotary drum 10 is brought to a normal position, the rotary drum stop position detection switch 22 is turned off. As a result, the rotary drum 10 returns to its normal position and is stopped.

(Effects of the Invention) As described above in detail, the apparatus for returning a rotary drum to a normal position according to the present invention is provided with a backup battery, a backup changeover switch, a rotary drum position detection switch, and a backup connection circuit.

Therefore, even if the rotary drum is stopped in an abnormal position due to a power failure such as a power outage or inadvertent unplugging of the outlet, it can be returned to the normal position and stopped.

As a result, ink leakage is prevented, so there is no need to clean areas contaminated with leaked ink.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a main part of a first embodiment of a device for returning a rotary drum to a normal position according to the present invention. FIG. 2 is a schematic diagram for explaining the configuration of the rotary drum. FIG. 3 is a circuit diagram showing a first embodiment of the circuit of the rotary drum home position return device according to the present invention. FIG. 4 is a circuit diagram of a second embodiment of the circuit of the rotary drum home position return device according to the present invention. 1... Main morph 2, 3. 4.5... Gear 6... Transmission shaft 7.9... Pulley 8... Belt 10... Rotating drum 13.14... Gear 15. ...Clutch 16...Backup motor 20...Bank up battery 21...Backup changeover switch 22...Rotary drum stop position detection switch 25...
Normal power supply circuit 26... Backup connection circuit Patent applicant Tokyo Aircraft Instrument Co., Ltd. Agent Patent attorney Inoro Mizotsukizu (B) (C) 0a UO Figure 3

Claims (1)

[Claims] In a stencil rotary press using a rotary drum having a portion provided with ink penetration holes and a bottomed ink reservoir portion without ink penetration holes, a backup battery and a backup changeover switch that is normally closed when the power is cut off; a rotary drum position detection switch that detects a stop position of the rotary drum and is opened when the rotary drum is at the normal stop position; and a backup changeover switch and the rotary drum stop position when the rotary drum is not at the normal stop position when the power is normally turned off. A device for returning a rotary drum to a normal position, comprising a backup motor that rotates a main motor that drives the rotary drum by a detection switch, or a backup connection circuit that connects the main motor to the backup battery.