JPS58152754A - Film carrying through apparatus - Google Patents

Abstract

PURPOSE:To stably carry through a film by installing a film tension detector between the respective film driving parts of a film carrying through device and a rolling-out part etc., and controlling the driving of the film on the rolling-out part etc. so that a constant detection signal can be obtained. CONSTITUTION:When the starting edge of a film 5 is fixed at A point to a bar 8, and a chain 9 is driven by a motor 10, a motor 3 representing the driving part for the film 5 located on the original rolled film 1 side in relation to the position of a tension detector 4 is driven at the same time, and the output of the motor 3 is controlled so that a constant detection signal of the tension detector 4 can be obtained. Therefore, the tension of the film 5 is stabilized independently of the output of the motor 10, e.g., the variation of the speed of the chain 9, and carrying through of the film is stabilized. In this case, if the film processing apparatus is not equipped with a tension detector and a tension detector is installed at B point on the film 5, carrying through of the film can be performed by using a motor 7 together with the motor 10.

Description

Detailed Description of the Invention The present invention involves unwinding a film from an original film, printing,
In film processing equipment that has a processing section over a relatively long distance for performing processing such as drying after processing such as painting, it is provided to insert the starting end of each raw film into the processing section. This invention relates to a film threading device.

First, an example of a film printing press, which is an example of a film processing apparatus having such a film threading device, will be described with reference to FIG.

1 is an original film, and the film 5 is unwound by a drive roll 2 driven by a drive motor 3, printed by a plate cylinder 6 driven by a plate cylinder drive motor 7, and then passed through a dryer 11.
After fi/not shown.

Sent to processing, winding equipment, etc. When the dryer 11 is in operation I, the film 5 is transported on rollers. Drive roll 2
A tension detector 4 is attached to the film 5 between the plate cylinder 6 and the plate cylinder 6, and adjusts the outputs of the drive motors 3 and 7 during operation.

A film threading chain 9 driven by a drive motor 10 is provided to insert the starting end of each original film in the dryer 11 into the dryer 11, and the chain 9 is provided with a film threading bar 8. . Drive motor 10
Induction motors are generally used.

Conventionally, when threading a film, the starting end of the film is fixed at point A to the bar 8 attached to the film threading chain 9, and at point B, an operator pulls out the film from the film feeding printing section side, and the film is threaded. After accumulating a sufficient amount of water, the chain 9 was driven, and the worker manually fed the film in accordance with the movement of the chain 9, and the chain 9 carried the starting end of the film to the zero point. However, if there is a roller driven by a DC motor or the like on the feeding printing unit side, that roller becomes a load and it becomes difficult for one worker to continuously feed the film. In many cases, it is difficult to pull the film from the unwinding side using only an electric motor. It is conceivable to use the feed-out drive motor 3 or plate cylinder drive motor 7 together with the chain drive motor, but since the chain drive motor is an induction motor and its speed changes depending on the load, the chain drive motor is used as the feed-out side motor. It is difficult to operate in synchronization,
This may lead to accidents such as breakage of the bar 8 of the chain 9.

Therefore, it is desired to be able to perform this film threading operation smoothly and automatically.An object of the present invention is to eliminate the inefficient work of conventional film threading devices, and to perform the film threading operation smoothly and automatically. The purpose of the present invention is to provide a device that can perform film threading.

The film threading device according to the present invention provides a film tension detector between the film drive part of the film threading device and the film drive part of the unwinding or processing section, or uses an existing tension detector to detect the tension. This device is characterized by having a means for controlling the drive of the film in the unwinding or processing section so that the detection signal value from the device is constant.

EMBODIMENT OF THE INVENTION Hereinafter, the apparatus of this invention will be explained in detail based on the drawing of an Example. First, the application of the apparatus of the present invention to the film printing apparatus shown in FIG. 1 will be explained. The apparatus shown in FIG. 1 is a sectional drive type apparatus in which each drive section is driven by a separate motor 3.7. In this rod device, the output of each drive source is adjusted by tension control or the like. The device of FIG. 1 is equipped with a tension detector 4 for this purpose. Therefore, this tension detector 4 can be used in the device of the present invention. That is, when fixing the starting end of the film 5 to the bar 8 at point A and driving the drive motor 10 of the chain 9, the tension detector 4 detects the original film 11IIll.
The drive motor 3 of the drive portion of the film 5 is also operated at the same time, and the output of the drive motor 3 is controlled so that the detection signal of the tension detector 4 is constant. As a result, the tension of the film is stabilized regardless of variations in the output of the chain drive motor 10, that is, the speed of the chain 9, and stable film threading can be performed without the need for assistance from an operator.

If the film processing device is not equipped with a tension detector, it is of course necessary to provide one.

For example, in the apparatus shown in FIG. 1, if a tension detector is provided at point B of the film 5, the plate cylinder drive motor 7 can be used in conjunction with the chain drive motor 10 to thread the film.

A control circuit for the film threading device in the apparatus shown in FIG. 1 is shown in a block diagram in FIG. Film threading start signal 1
01 is input to the motor 3 control device 104 and the motor 10 control device 105, each control device 104 and 10
5 drive motors 3 and 10, respectively. On the other hand, the detection signal value from the tension detector 4 is compared with the setting signal value from the tension setting device 103, and the motor 3 is controlled by the control device 104 so that the detection signal value from the tension detector 4 is constant. Ru. Here, if the speed of the motor 10 decreases, the tension of the film in the D section decreases and the detection signal of the detector 4 also decreases, so the motor 3 is controlled to increase the tension in the D section and the speed decreases. Furthermore, even if the speed of motor 10 increases, motor 3
is controlled. As a result, even if there is some variation in the speed of the chain drive motor, the drive motor 3 is controlled to follow the speed change, allowing continuous and stable film threading without operator assistance. It can be performed.

When the film reaches the 0 point and the film threading is finished,
A film threading stop signal 102 is output manually or automatically, and both motors 3 and 10 are stopped.

Generally, film dryers have a distance of 40-50 m. The film is passed through this dryer using a film passing device as described above. Generally, the speed is about 10 m/min.

That is, with conventional equipment, a worker can spend 4 to 5 minutes
Film had to be continuously fed to the film threading device.

When using the apparatus of the present invention, the operator does not have to intervene at all from the time the film threading device is operated until the film threading is finished, and moreover, stable film threading can be performed.

The apparatus of the present invention can be used at a very low cost because it can utilize the original functions of the processing equipment for which the apparatus of the present invention is normally installed, i.e., the equipment and signals used during processing such as printing and coating. Realization is possible.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a film printing apparatus, and FIG. 2 is a block diagram of a control system of an embodiment of the apparatus of the present invention. 1... Unwinding film, 2... ffi movement 1:l-/l
', 3.7.10... Drive motor, 4... Tension detector, 5... Film, 6... Plate cylinder, 8... Bar for film threading, 9... For film threading Che 7.11...
·Dryer.

Claims (1)

[Claims] After unwinding and processing the film from the original film, the starting end of each original film is passed through the processing part l in a film processing device that has a processing part spanning a relatively long distance for processing such as drying. In a film threading device provided for the purpose of A film threading device characterized by comprising means for controlling the drive of the film in the unwinding or processing section so that the detection signal value from the tension detector becomes constant.