JPS63165262A - Film intermittent feed device for bag making machine and the like - Google Patents

Abstract

PURPOSE:To perform the high-precise intermittent feed of a film, by a method wherein an output from a pulse encoder, responding to the drive speed of a bag making machine and the like, is compared with a pulse signal from the feed roller side through a pulse frequency modulating device to control a servo motor. CONSTITUTION:Through drive of a rotary shaft 2 of a bag making machine and the like, a pulse train and an origin signal ore outputted from a pulse encoder 4, and a pulse frequency modulating device 6 is set automatically or manually by means of a feed amount correction signal generating device 8. Based on a one full feed amount of a film 16, an arbitrary origin is set, and a frequency modulating pulse, the frequency of which is changed according to a triangular function wave. A deviation counter 10 controls a servo motor 14 through comparison with an output from a pulse encoder 20, and intermittently rotates a feed roller 18. This constitution facilitates setting of a film feed amount, enables high-precise control of the feed roller, and enables increase of a speed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an intermittent feeding device for film (m-shaped member) for bag making machines, sticker printing machines, etc.

[Conventional technology]

Conventionally, this type of device consists of a panel connected to the drive device of the machine,
A disk connected to the film feed roller is connected by a crank mechanism, and the continuous rotation of the disk on the drive side is converted into forward and reverse rotation of the disk on the feed roller side. The forward and reverse rotational motion of the plate on the feed roller side is transmitted to the feed roller via a one-way clutch or an electromagnetic clutch and an electromagnetic brake, and the feed roller rotates intermittently in one direction with a speed characteristic of a certain trigonometric function signal. The film, ie, the thin member, is intermittently fed by the feed roller.

The amount of film feed is adjusted by using an actuator to change the connecting portion of the crank arm of the crank mechanism with the disk on the drive side in the radial direction of the disk.

[Problem that the invention seeks to solve]

If the mechanical intermittent film feeding device was configured as described above, the structure would become complicated and the cost would increase, and furthermore, the film could not be fed intermittently at high speed and with high precision.
The present invention aims to eliminate the above-mentioned defects.

[Means to solve problems]

In order to achieve the above object, the present invention provides a first pulse encoder that is attached to a rotating shaft 2 driven by a drive device of a machine such as a bag making machine, and that converts the rotational movement of the rotating shaft 2 into a pulse signal and outputs the pulse signal. 4, a pulse frequency adjustment device [16] connected to the output end of the pulse encoder 4 and capable of modulating the frequency of the pulse signal to a frequency corresponding to an arbitrary trigonometric function wave; a deviation counter 10 connected to the output end of the adjustment device 6; a servo motor 14 connected to the output side of the deviation counter 10 and having an output shaft connected to a feed roller 18 of the machine; and a rotation shaft of the servo motor 14. and a second pulse encoder 20 whose output terminal is connected to the other input terminal of the deviation counter 10.

[Effect]

When the rotating shaft 2 is driven, the input shaft of the pulse encoder 4 rotates, and the pulse encoder 4 outputs a pulse train and an origin signal. This pulse train is input to the pulse frequency modulator 6, and the pulse frequency modulator 6 outputs a frequency modulated pulse whose frequency changes according to a trigonometric function wave whose origin is arbitrarily set. , is input to one input terminal of the deviation counter 10. On the other hand, a pulse encoder 2 converts the rotational motion of the output shaft of the servo motor 14 connected to the feed roller 18 into a pulse signal.
The output of 0 is input to the other input terminal of the deviation force counter 0. The deviation counter lO outputs a trigonometric function analog electrical signal based on input pulses at a pair of input terminals, and this output is:

The signal is amplified and supplied to the servo motor 14.

The servo motor 14 is intermittently driven by a trigonometric electric signal input thereto, and rotates the feed roller 18 intermittently.

〔Example〕

The structure of the present invention will be described below with reference to embodiments shown in the accompanying drawings.

Reference numeral 2 denotes a rotary shaft connected to a drive device of the bag making machine, and an input shaft of a commercially available pulse encoder 4 is connected to this. The output end of the pulse encoder 4 is connected to the input end of a known pulse frequency modulation device 6. The pulse frequency modulation device 6 is based on the input pulse train and origin signal from the pulse encoder 4.

It is configured to produce a frequency modulated pulse output whose frequency is modulated according to a trigonometric function wave having an arbitrary origin. A feed amount correction signal generating device 8 is connected to the control end of the pulse frequency adjusting device @6, which outputs a signal for increasing or decreasing the number of output pulses of the device.

10 is a deviation counter, which counts the pulses input to a pair of input terminals, and outputs an analog electrical signal that is proportional to the frequency of the output pulse of the frequency modulator 6, and when the deviation between the two is O, the output is O. This outputs the following. One input terminal of the deviation counter IO is connected to the output terminal of the pulse frequency modulation device 6.

12 is a servo amplifier, which is connected to the output terminal of the deviation counter 10. 14 is a servo motor connected to the output end of the servo amplifier 12, and its output shaft is:
It is connected to a feed roller 18 for feeding the film 16. 20 is a pulse encoder whose input shaft is connected to the output shaft of the servo motor 14, and whose pulse output end is connected to the other input end of the deviation counter 10.

Next, the operation of this embodiment will be explained.

When the rotating shaft 2 is driven, the input shaft of the pulse encoder 4 rotates, and the pulse encoder 4 rotates.

A pulse train 22 and a yK point signal, that is, a two-signal 24 are output. A sine curve 21 in FIG. 2(a) indicates the phase angle e of the rotating shaft 2. The pulse train 22 and Zr1 24 are input to the pulse frequency modulator 6, and the pulse frequency modulator 6 generates an arbitrarily set trigonometric function waveform, for example (1-
cos2θ), and outputs a modulated output 26. This modulated output 26 is supplied to one input end of the deviation counter 10. On the other hand, the output pulses of the pulse encoder 20 are input to the other input terminal of the deviation counter 10. The deviation counter lO is.

The pulses inputted to the pair of input terminals are counted, and an analog electrical signal 28 is outputted which is proportional to the frequency of the output pulse of the frequency modulation device 6 and has an output of 0 when the deviation between the two is 0. This signal has a waveform of K·(1-cos 2 e), where 1, for example, K is a constant. signal 2
8 is supplied to a servo motor 14 via a servo amplifier 12. The servo motor 14 is.

The output shaft is driven to rotate intermittently by a trigonometric function electric signal 28 of K.(1-cos 2 e) inputted thereto, and the film 16 is intermittently fed. Frequency modulator 6
The number of output pulses N2 is determined by N2=NIXn (n is the correction signal).

Note that N1 is the number of output pulses of the pulse encoder 4 in one half rotation of the rotating shaft 2. The feed amount of the film 16 by one driving operation of the servo motor 14 is determined by the pulse frequency modulator 6 based on the output n of the feed amount correction signal generator 8.
The output pulse number N2 can be adjusted automatically or by changing it by manual setting means.

〔effect〕

As mentioned above, the present invention does not use a crank mechanism, so the structure is simple and can be manufactured at low cost.Since the present invention uses a pulse frequency modulation device, it is easy to set the film feed amount and the feed roller can be controlled with high precision. Moreover, there are effects such as speeding up.

[Brief explanation of the drawing]

FIG. 1 is a block circuit explanatory diagram, and FIG. 2 is a waveform diagram. 2... Rotation axis, 4... Pulse encoder. 6.Pulse frequency modulation device, 12..Servo amplifier, 14..Servo motor, 16.
...Film, 18...Feed roller. 20...Pulse encoder

Claims (1)

[Claims] (1) A first pulse encoder 4 that is attached to a rotating shaft 2 driven by a drive device of a machine such as a bag making machine and converts the rotational movement of the rotating shaft 2 into a pulse signal and outputs the pulse signal; A pulse frequency modulator 6 is connected to the output end of the pulse frequency modulator 4 and is capable of modulating the frequency of the pulse signal to a frequency corresponding to an arbitrary trigonometric function wave, and one input end is connected to the output end of the pulse frequency modulator 6. a servo motor 14 connected to the output side of the deviation counter 10 and having an output shaft connected to a feed roller 18 of the machine;
An intermittent film feeding device for a bag making machine or the like, comprising a second pulse encoder 20 connected to the rotating shaft of the servo motor 14 and having an output end connected to the other input end of the deviation counter 10.