JPS59167438A - Film feeding device - Google Patents

Abstract

PURPOSE:To enable proper correction of a feed distance error, by a method wherein the upper and the lower limit of a stepped roller, being attendant on a feeding distance error occurring between a continuous feed roller and an intermittent feed roller, are detected, and a proper differential motion is caused by a differential motor to exert it on the continuous feed roller so as to properly correct the feeding distance error. CONSTITUTION:With a driving shaft 7 turned under condition in that a motor 11 directly coupled to a differential mechanism 10 is locked, a continuous feed roller 12 and an intermittent feed roller 9 are turned to feed a film 15. If the sizes of the continuous and intermittent rollers 12 and 9 are set to their respective values such that their rotation amounts, proportional to one full turn of the driving shaft 7, coincide with each other, a stepped roller 13 is repeatedly moved up and down, under an ideal condition, at a specified timing and at a certain fixed location. However, a slight difference in a feed distance occurs in feeding action of the two rollers 9 and 12, due to a cause such as slips, and thereby such differences are accumulated, resulting in variation in the position where stepped roller 13 makes vetical motion. The varied amount is detected by a rotary encoder, the motor 11 is run forwardly and reversely, and a differential motion is exerted on the continuous feed roller 12 to correct the accumulated error of a film feeding distance.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a film feeding device in film manufacturing equipment or magnetic/paper tape manufacturing equipment.

2. Structure of the conventional example and its problems FIG. 1 shows a conventional example of a mechanism in which a film pass line with intermediate step rollers in between is continuously fed in the first half and intermittent fed in the latter half.

1 is a continuous feed roller, 2 is a servo motor that controls the rotation of this roller, 3 is a camshaft, which is connected to a Geneva mechanism 4.
The intermittent feed roller 6 is rotating. 6 is a film.

For both the intermittent feed and continuous feed rollers 6 and 1, differences occur in the length of the film fed during one cycle due to errors in the outer diameter of the rollers, fluctuations in rotational speed, slips between the film and the rollers, and the like. Assuming that both rollers are fed in an ideal state, the step roller repeatedly moves up and down at a certain timing every cycle of the camshaft. Therefore, the film is fed by detecting the position of the step roller at a certain timing, comparing it with the position in an ideal state, and applying feedback control to the servo motor.

In such a mechanism, since the intermittent feed roller and the continuous 3 Bohemian feed roller are rotated by separate drive sources, a delay in response tends to occur between the two. In particular, when the film feed is started from a stopped state, the delay in the start-up time of the servo motor has the greatest effect, causing a hunting phenomenon in the film and even causing the film to be cut.

Purpose of the Invention The present invention solves the above-mentioned drawbacks by rotating the continuous feed roller and the intermittent feed roller from the same drive source, and by providing differential motion to the continuous feed roller, the amount of feed generated between the two rollers is improved. This makes it possible to correct the difference, and this allows the film to be fed stably with a simple control method.

Structure of the Invention In the present invention, a continuous feed roller is rotated from one camshaft via a differential mechanism, and at the same time, an intermittent feed roller is rotated from the same camshaft via an index mechanism, and an intermittent feed roller is rotated from the same camshaft via an index mechanism. A stepped roll is installed to apply tension to the film while the roller is stopped, a detector is installed to detect the position, and a differential motor is connected to the differential mechanism. It is. As a result, the single continuous feed roller and the intermittent feed roller can be rotated by the same driving source, and by detecting the upper and lower limits of the step roller and applying an appropriate differential to the continuous feed roller with the differential motor, It has the unique effect of being able to correct feed errors between continuous and intermittent rollers while rotating the camshaft.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a perspective view of a film transport mechanism according to an embodiment of the present invention. In Fig. 2, 7 is a drive shaft, 8 is an index mechanism using a Geneva gear, 9 is an intermittent feed roller,
1o is a differential mechanism using a bevel gear, 11 is a motor that provides differential motion, 12 is a continuous feed roller, 13 is a step roller, and 14 is a rotary that detects the position of this step roller 13 as the rotation angle of its fulcrum shaft. The encoder 16 is a film.

The operation of this embodiment is as follows. By rotating the drive shaft with the motor directly connected to the differential mechanism locked, the continuous feed roller 12 and the intermittent feed roller 9 are rotated, and the film 16 is fed out. If the diameters of both the continuous and intermittent rollers 12 and 9 are set so that the amount of feed per revolution of the drive shaft 7 is the same, then in an ideal state the step roller 13 will be at a certain position at a certain timing. Repeat the up and down movement. However, since there is a slight difference in the amount of feed caused by slips between the two rollers, this is accumulated and the vertical position of the step roller 13 changes. The amount of change is detected by a rotary encoder, and the motor connected to the differential mechanism is rotated in the forward and reverse directions to correct the accumulated difference in film feed amount.

Effect of the invention According to the present invention, the following effects can be achieved.

(1) Continuous feed and intermittent feed can be driven from the same drive shaft, and completely synchronous feed can be performed every cycle.

(2) Only the difference between continuous feed and intermittent feed can be corrected, and this difference is extremely small in practice, so simple motor ON, ○FF that does not require speed control etc. This allows for more precise correction.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional example in which the film is continuously fed in the first half and intermittently fed in the second half, and FIG. 2 is a perspective view of a film feeding device according to an embodiment of the present invention. 8... Index mechanism, 9... Intermittent feed roller, 1o... Differential mechanism, 12...
...One continuous feed roller, 13...Step roller. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] It has a continuous feed roller that is continuously rotated from a camshaft via a differential mechanism, and an intermittent feed roller that is intermittently rotated from the same camshaft via an index mechanism, A step roller is installed in the middle to absorb the asynchronization of the feed timing due to the difference between continuous and intermittent rotation.The position of this step roller is detected, and if a deviation from the theoretical position occurs, the differential mechanism described above Continuous feeding by applying a differential force to the roller and increasing and lowering the rotation speed of the continuous feed roller. A film feeding device that has the function of correcting the cumulative error in feeding amount between intermittent rollers.