JP2562829Y2 - Squeegee drive for automatic screen printing machine - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a squeegee driving device for an automatic screen printing machine, and more particularly, to a squeegee for improving driving efficiency and squeegee stopping position accuracy and for simplifying and miniaturizing the entire squeegee driving device. It relates to a driving device.

[0002]

2. Description of the Related Art A squeegee device in an automatic screen printing machine is unitized for each color and each is driven independently. Conventionally, a general-purpose motor or an inverter motor has been used for this drive.

In general, inverter motors are mainly used because general-purpose motors have a constant rotation speed, and it is difficult to change the squeegee speed. However, the inverter motor is unstable in output torque and rotation speed in a low speed range, and is therefore limited to use in a high speed range.

[0004] Therefore, a speed reduction mechanism is required, and the output shaft has only one standard direction, and a separate output shaft must be provided for driving the squeegee on the side opposite to the motor side.

For these reasons, conventionally, a deceleration drive device is required in addition to the squeegee drive motor, which hinders loss of drive efficiency, poor squeegee stop position accuracy, and miniaturization and simplification.

[0006]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to improve the squeegee drive efficiency and the squeegee stop position accuracy, and to simplify and downsize the entire squeegee drive device.

[0007]

According to the present invention, in a squeegee driving device for an automatic screen printing machine, a squeegee carrier provided on both sides of a squeegee, a squeegee driving motor provided on both sides of an output shaft, and a drive are provided. A pulse generator connected to the motor and controlling the driving of the motor by detecting the number of rotations thereof, and a squeegee drive system for drivingly connecting both sides of the output shaft and the squeegee carrier without passing through a speed reducer. Thus, the above problem is solved.

It is preferable that one output shaft of the squeegee drive motor and one squeegee drive system be connected to each other via a coupling, a connecting square shaft and a sleeve joint having a square hole so as to be extendable and non-rotatable with each other.

[0009]

The squeegee driving device of the automatic screen printing machine according to the present invention has squeegee carriers provided on both sides of the squeegee. In the present invention, the output shaft is provided on both sides for driving the squeegee carrier. Use a squeegee drive motor.

The squeegee drive motor 7 is advantageously an AC servo motor, but is not limited to this.
-It is also possible to use a C motor and an inverter motor as long as the stability of output torque and rotation speed can be maintained.

The output shaft of the drive motor 7 is 7A as shown in FIG.
7B, the squeegee carriers 12 on both sides can be directly driven on one axis. Therefore, it is possible to improve the driving efficiency and the accuracy of the squeegee stop position.

The stop position of the squeegee, that is, the stop position on both sides of the squeegee carrier 12 in the Y direction in the figure, is highly accurate from the start to the stop of the drive motor 7 by the pulse transmitted from the pulse generator 8 directly connected to the motor 7. Is controlled.

Even if the interval D between the squeegee guide frames 11 on both sides is changed with the change of the printing repeat length R, the drive transmission of the squeegee is performed by the telescopic connection between the connecting angular shaft 16 and the sleeve joint 17. The operation is easy and simple without any operation.

As described above, the conventional deceleration driving device and other devices for transmitting driving are largely omitted, and the entire printing unit including the squeegee driving device is reduced in size and simplified, operability is improved, and cost is reduced. Can be measured.

[0015]

1 shows a plan view of the entire printing unit (partially omitted) including the squeegee driving device of the present invention. On the machine base 1 of the automatic screen printing machine, necessary numbers are arranged according to the number of printings so that the illustrated printing units can move on the guide rails 6 in the X direction in the figure.

In the automatic screen printing machine, an endless belt 2 is stretched between the front and rear rollers, and is intermittently driven for each repeat length R in a direction indicated by an arrow X in FIG. Squeegee 1 via screen 4
By means of No. 4, multicolor printing is performed as is known.

As shown in FIG. 1, the printing unit includes a squeegee drive motor 7, chain cases 9 and 10, two squeegee guide frames 11 separated by a distance D, a squeegee 14, and the like. The screen 4 is supported by the support member 5 at the center thereof, and fine adjustment of the matching is performed by a screen adjusting device (not shown).

The squeegee drive motor 7 is flange-mounted on one of the chain cases 9, and as described above, its output shaft is a double shaft type of 7A and 7B. The drive motor 7 is advantageously an AC servo motor,
-A variable speed motor such as a C motor or an inverter motor can be used.

A chain wheel 19 is fixed to one output shaft 7A of the drive motor 7, and a coupling 15 is fixed to the other output shaft 7B. One end of a connection square shaft 16 is further fixed to the coupling 15, and the other end is connected to a square hole of the sleeve joint 17 so as to be able to expand and contract and not to rotate.

Due to the above-mentioned configuration, the squeegee drive can be easily and smoothly transmitted without any operation when the interval D of the printing units is changed due to the change of the repeat length R.

The sleeve joint 17 is fixedly connected to a shaft 18 which is mounted on the other chain case 10.
0 is fixed. The chain wheel 20 has the same number of teeth and the same diameter as the chain wheel 19.

In the squeegee guide frames 11 on both sides, squeegee carriers 12 are respectively guided so as to be able to travel in the Y direction in the drawing. 12 is provided with a running drive. As this driving means, a timing belt or the like is used in addition to the roller chain.

A squeegee bracket 13 is supported on the squeegee carrier 12 such that a squeegee pressure can be adjusted. Two squeegees 14 are provided as a pair as shown in the figure.

The travel distance S is set in advance in the control device, and is controlled by the number of pulses transmitted from the pulse generator 8 directly connected to the drive motor 7 in accordance with a pulse corresponding thereto. Therefore, the squeegee speed (usually 1.0 m / sec.
(2.7 m / s) is changed, the squeegee stop position is always unchanged, and the leading distance S is maintained with high accuracy.

According to the present invention, a conventional squeegee drive motor can use a conventional 1.5 kW inverter with a 1.2 kW AC servomotor, and the energy saving effect of the entire printing machine can be achieved as multicolor printing is performed. It is.

[0026]

According to the present invention, the squeegee drive efficiency and the squeegee stop position accuracy are improved by providing the two-axis drive motor and the pulse generator in a specific mechanism in the squeegee drive device. The entire device can be simplified and downsized.

[Brief description of the drawings]

FIG. 1 is a plan view of an entire printing unit (partially omitted) including a squeegee driving device of the present invention.

[Description of Signs] 1 Machine stand 2 Endless belt 3 Printing cloth 4 Screen 5 Screen support member 6 Guide rail 7 Squeegee drive motor 7A Motor output shaft 7B Motor output shaft 8 Pulse generator 9 Chain case 10 Chain case 11 Squeegee guide frame 12 Squeegee carrier 13 Squeegee bracket 14 Squeegee 15 Coupling 16 Connecting square shaft 17 Sleeve joint 18 Shaft 19 Chain wheel 20 Chain wheel 21 Roller chain 22 Chain joint

Claims (2)

(57) [Scope of request for utility model registration] 1. A squeegee driving device for an automatic screen printing machine, comprising: a squeegee carrier provided on both sides of a squeegee; a squeegee driving motor provided on both sides of an output shaft; A pulse generator for controlling the driving of the motor and a squeegee drive system for drivingly connecting both sides of the output shaft and the squeegee carrier without passing through a speed reducer. Machine squeegee drive. 2. The one output shaft and one squeegee drive system are connected to each other via a coupling, a connecting square shaft, and a sleeve joint having a square hole so as to be extendable and non-rotatable with each other. Squeegee drive.