JPH0628912B2 - Control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Object of the Invention [Field of Application of the Invention] The present invention relates to a control device, and more particularly, to a slave operation device that is operated faithfully in synchronization with the rotational movement of a rotary shaft of a main machine drive system. The present invention relates to a control device that controls a drive device for driving a motor.

[Conventional technology]

Conventionally, as a control device and a drive device of this type, a crank device 10 fixed to a rotary shaft 11 of a main machine drive system and a gear device 90 driven by the crank device 10 have been used as shown in FIG. That is, the arm 12 whose one end is fixed to one end of the rotary shaft 11 has a housing 12a and a shaft 12c which is disposed in the housing 12a and is rotated by a rotary lever 12b. One end of the rod 13 is engaged with the shaft 12c, and the distance between the engagement position and the position where the arm 12 is fixed to the rotary shaft 11 is adjusted by the rotation operation of the rotary lever 12b. The other end of the rod 13 was pivotally supported by a part of a fan gear 15 which was rotatable around a rotary shaft 14. A gear 18 fixed to a rotary shaft 17 was meshed with a tooth portion 16 of the sector gear 15. A gear 91 of a gear device 90 is fixed to the rotary shaft 17, and an intermediate gear 92 is attached to the gear 91.
Was engaged. An output gear 93 was connected to the intermediate gear 92 via a clutch brake mechanism (not shown). The output gear 93 was connected to the working device 60, for example, a main roller 61 for film transport in the case of a bag-making machine. The driven roller 63 was in contact with the main roller 61 for transferring the film via the film 62 which is the transferred object.

As a result, the crank device 10 is operated in perfect synchronization with the rotational movement of the rotary shaft 11 of the main machine drive system, and the operation of the crank device 10 causes it to be stretched by receiving an excessive force during the transportation of the transported object such as a film. In order to eliminate the obstacles associated with the characteristics described above, the working device 60 is made to correspond one-to-one via the gear device 90 to the control condition specified as desired, so that the working device 60 is rotated about the rotary shaft of the main machine drive system. It was operating in perfect synchronization with the rotating motion of 11.

However, when it is necessary to change the working amount of the working device 60, for example, the film feeding amount in the case of a bag making machine, the rotary lever
The rotation radius of the arm 12 was changed by rotating 12b.

[Problems to be solved]

In the above-described conventional control device, since the work amount of the work device is changed and set by changing the radius of gyration of the arm 12, there is a drawback that skill is required for setting the work amount and the setting mechanism is complicated. there were. In addition, since the crank device and the working device are mechanically connected by a gear device, there is a drawback that the range in which the working device can be installed with respect to the crank device is limited.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a control device capable of easily changing and setting the work amount of the work device.

(2) Configuration of the invention [Means for solving the problems] The control device according to the present invention is provided in the rotation output section of the main machine drive system, and the pulse interval corresponding to the change in the rotation speed of the rotation output section. A pulse encoding means for outputting a main pulse train having a change; a pulse frequency converting means for processing the main pulse train to reduce the number of pulses of the main pulse train per predetermined time at a set ratio; and the pulse frequency converting means. And a motor device for synchronously driving the working device by the pulse train obtained from the pulse frequency conversion means.

Alternatively, a power conversion means for converting the rotational power of the main machine drive system into a reciprocating rotary motion and a pulse for outputting a main pulse train having a pulse interval change corresponding to the speed change of the reciprocating rotary motion converted by the power converting means An encoding unit, a pulse frequency conversion unit that processes the main pulse train and reduces the number of pulses of the main pulse train per predetermined time, and a setting unit that sets the pulse reduction ratio by the pulse frequency conversion unit. A motor device for synchronously driving the work device by a pulse train obtained from the pulse frequency conversion means.

[Action]

In the above means, the rotation output of the rotation output section of the main machine drive system,
For example, the reciprocating rotation output is converted by the pulse encoding means into a main pulse train having a pulse coarse density corresponding to a change in rotation speed. The main pulse train is frequency-divided by the pulse frequency conversion means, for example, at a predetermined ratio, and if there is a surplus pulse as a result of the frequency division, it is thinned out to become a pulse train in which the number of pulses per predetermined time is reduced. The reduction ratio is set by the setting unit according to the work amount of the working unit. The motor device is driven based on the pulse train output from the pulse frequency conversion means, and the work device is driven in synchronization with the main machine drive system. Moreover, by setting the pulse reduction ratio, it is possible to easily change and set the work amount of the work device.

〔Example〕

Next, the control device of the present invention will be specifically described with reference to the accompanying drawings.

FIG. 1 is an explanatory diagram of an embodiment of the present invention. FIG. 2 is an explanatory view of another embodiment of the present invention.

Reference numeral 10 is a crank device fixed to a rotary shaft 11 of a main machine drive system, and is set to perform a desired reciprocating motion in synchronization with the rotary motion of the rotary shaft 11. That is, a rotating disk 12 is fixed to the rotating shaft 11, and a rod is attached to a part of the rotating disk 12.
One end of 13 is pivoted. The other end of the rod 13 is a rotating shaft
It is pivotally supported by a part of a sector gear 15 which is rotatable around 14. The tooth portion 16 of the sector gear 15 has a gear fixed to the rotating shaft 17.
18 meshed. One end of the rotating disk 12 is the rotating shaft 11
It may be replaced with another rod fixedly attached to the rod and pivoted at one end of the rod 13 at the other end.

20 is a gear meshed with the fan gear 15 of the crank device 10.
The pulse encoder device attached to the rotary shaft 17 of 18 extracts the operation of the crank device 10 synchronized with the rotary motion of the rotary shaft 11 of the main machine drive system as an electric signal. That is, a plurality of slits 22 are formed at equal intervals along the circumference of the disc 21 fixed to the rotary shaft 17, and the slits 22 of the disc 21 are formed.
A pulse encoder circuit for generating a phase A signal and a phase B signal with a phase difference of 90 degrees from the phase A by devising the number and arrangement of the light emitting element 23 and the light receiving element 24 facing each other via
When the pulse encoder circuit 25 supplies the voltage to the phase 25, the phase A voltage output and the phase B voltage output with a phase difference of 90 degrees from the phase A, that is, the pulse output are transmitted. As the pulse encoder device 20, not only the optical device described above but also a magnetic device can be used.

30 is a pulse encoder circuit 25 of the pulse encoder device 20
In the multiplication circuit connected to, the A-phase and B-phase voltage outputs obtained by the pulse encoder circuit 25, that is, the pulse outputs, are multiplied and the output of the pulse encoder circuit 25 is multiplied by 1,
A signal having twice or four times as many pulses (hereinafter referred to as a multiplied signal) is created. That is, in the case of 1 time, the multiplied signal is created using only the rising edge or the falling edge of the A-phase or B-phase pulse output. This 1 × multiplied signal contains the same number of pulses as the number of slits 22 formed in the disk 21. In the case of doubling, the multiplied signal is created using the rising edge and the falling edge of the A-phase or B-phase pulse output. This doubled signal contains twice as many pulses as the number of slits 22. In the case of quadruple, the multiplied signal is created by using the rising edge and the falling edge of the A-phase and B-phase pulse outputs. This 4 times multiplied signal contains 4 times as many pulses as the number of slits 22. Whether the multiplication number of the multiplication circuit 30 is 1, 2, or 4 is determined by the number of slits 22 and the precision of the control signal finally required. If the multiplication number is 1, the multiplication circuit 30 may be omitted.

Reference numeral 40 is a thinning / dividing circuit connected to the multiplying circuit 30, that is, an example of a pulse frequency converting circuit in the present invention, and an appropriate number of unnecessary pulses are thinned out by the thinning circuit 41 from the multiplied signal, and the dividing circuit 42 is further used. Then, the frequency is appropriately divided to generate a desired control signal. The number of pulses to be decimated in the decimating circuit 41 (hereinafter referred to as decimating argument) and the frequency division ratio in the frequency dividing circuit 42 are set by the setters 43 and 44, respectively. The set values of the setters 43 and 44 are set by the setter 45. For example, when the setters 43 and 44 are used in a bag-making machine, the feed length or cut length of one working cycle of the film is calculated.
Properly processed at 46 and created. That is, the calculator 46 determines the shape of the control signal according to the set value of the setter 45. When the shape of the control signal is determined, the sparse and dense pulse train signal corresponding to this control signal is determined. The number of pulses of this pulse train signal is compared with the number of pulses of the multiplied signal to determine the frequency division ratio of the frequency dividing circuit 42. When the frequency division ratio is determined, the frequency division surplus appears, but this frequency division surplus is used as an argument. If the number of pulses according to the inter-argument is all thinned out at the end of one working cycle, the shape of the control signal may become unsmooth and a working error may occur. It is preferable to perform thinning processing at intervals to make the shape of the control signal as smooth as possible.

As described above, the thinning / dividing circuit that is the pulse frequency converting means.
By 40, frequency division is performed at a predetermined ratio, and excess pulses due to the frequency division ratio are thinned out. Thereby, with respect to the output pulse from the multiplier circuit 30, that is, for the pulse train in which the pulse interval changes coarsely and finely based on the speed change of the reciprocating rotary motion of the disk 21,
A pulse train is generated in which the number of pulses per predetermined time is reduced at a predetermined rate, and the density relationship due to speed change remains. When the work device on the driven side is driven by this pulse train, the work device is driven at a speed change corresponding to the speed change of the disk 21, and the work amount, for example, the feed size of the film is changed based on the reduction ratio of the pulse train. To be

Reference numeral 50 denotes a motor device connected to the thinning / dividing circuit 40, which is rotated by a constant angle in accordance with the number of pulses included in the control signal output by the thinning / dividing circuit 40. Therefore, as the motor device 50, an NC servo motor, a PLL-controlled servo motor, a step motor, or the like is used. The control signal may be given to the motor after being processed by an appropriate processing circuit (not shown) depending on the type of the motor specifically used as the motor device 50.

A working device 60 is connected to the motor device 50 and performs an appropriate work on the work. For example, in the case of a bag-making machine, it is a main roller 61 for film transport. In this case, the driven roller 63 is in contact with the main roller 61 via the film 62 which is the work piece.

Further, the operation of the control device of the present invention will be described in detail.

First, in the setting device 45 of the thinning / dividing circuit 40, the working amount of the working device 60, for example, in the case of a bag-making machine, the feeding length of the film for one working cycle is set. The set value of the setter 45 is immediately given to the calculator 46, and the frequency division ratio of the frequency dividing circuit 42 and the argument of the thinning circuit 41 are calculated from the set value and the number of pulses included in the multiplied signal. The calculated inter-argument and frequency division ratio are setter 4 respectively.
It is set to 3 and 44 to specify the operation of the thinning circuit 41 and the frequency dividing circuit 42.

When the rotary disk 12 fixed to the rotary shaft 11 of the main machine drive system is rotated in the arrow A direction in synchronization with the main machine drive system, one end of the rod 13 is also rotated in the arrow A direction. This makes the fan-shaped gear
Since 15 is rotated about the rotation shaft 14 in the directions of arrow B and C, the tooth portion 16 also rotates the gear 18 in the directions of arrow D and E. At this time, the rotation of the fan gear 15 is an approximate sinusoidal curve motion because the rotation of the rotating disk 12 is a constant velocity motion, and thus the rotation of the gear 18 is also an approximate sinusoidal curve motion. In other words, the rotation operation of the gear 18 approximately draws a sine curve.

The rotation operation of the gear 18 is performed by the slit 22 formed in the disc 21 of the pulse encoder device 20 mounted on the rotating shaft 17 and the disc.
A light emitting element 23 and a light receiving element 24 arranged via 21 and a pulse encoder circuit 25 connected to the light receiving element 24 produce an appropriate voltage output, that is, a pulse output, which is output as an output of the pulse encoder device 20. The voltage output delivered by the pulse encoder circuit 25 is a pulse of an approximate sinusoidal curve because the rotational movement of the gear 18 and thus the disc 21 is an approximate sinusoidal curve motion.

The voltage output, that is, the pulse output, sent from the pulse encoder device 20 is given to the multiplication circuit 30 and appropriately multiplied. The multiplication rate is determined by the number of pulses included in the voltage output of the pulse encoder device 20 and the work accuracy of the work device 60.

The voltage output multiplied by the multiplier circuit 30, that is, the control signal is given to the thinning and dividing circuit 40. In the thinning / dividing circuit 40, since the thinning argument of the thinning circuit 41 and the frequency dividing ratio of the frequency dividing circuit 42 are set in advance, the thinning processing and the frequency dividing processing are executed in accordance with them.

The multiplication signal subjected to the thinning / dividing processing is given to the motor device 50 as a control signal. The motor device 50 is operated with an appropriate speed waveform according to the control signal.

A working device 60 is connected to the motor device 50. The case of the bag making machine shown in FIG. 1 will be described in detail. A main roller 61 for transferring a film is connected to the output shaft of the motor device 50, and a film 62 disposed between the main roller 61 and the driven roller 63 is provided. It is conveyed by a predetermined distance in the direction of arrow F at a speed corresponding to the operation waveform of the motor device 50.

Although the thinning / dividing circuit 40 is used in the above description, a thinning circuit or a dividing circuit can be used as necessary if the working accuracy of the working device does not require very high accuracy. Depending on the case, it can be omitted altogether.

Further, in the above description, the case where the rotating disk, the rod and the fan gear are used as the crank device has been mainly described, but a crank device having another structure may be used. For example, as shown in FIG. 2, an arm whose one end is fixed to a rotary shaft 11
One end of the rod 13A is pivotally supported on the other end of the rod 12A, and the other end of the rod 13A is pivotally supported on one end of the rod 15A to reciprocate the rod 15A so that the gear 18 is rotated by the gear 16A formed on its peripheral surface. May be.

(3) Effects of the Invention As described above, in the present invention, the rotation output from the main machine drive system, for example, the output of the reciprocating rotary motion is converted into a pulse train, and the working device is driven at a speed based on the density variation of this pulse train. . By reducing the number of pulses in the pulse train at a set ratio, the work amount of the working device, such as the film feed size, can be changed. This work amount can be set only by setting the reduction ratio of the number of pulses, and therefore the change setting is very simple.

[Brief description of drawings]

FIG. 1 is an illustration of an embodiment of the present invention, FIG. 2 is an illustration of another embodiment of the present invention, and FIG. 3 is an illustration of a conventional example. 10 …… Crank device 11 …… Rotating shaft 12 …… Rotating disc 13 …… Roller 14 …… Rotating shaft 15 …… Fan-shaped gear 16 …… Tooth part 17 …… Rotating shaft 18 …… Gear 20 …… Pulse encoder device 21 ...... Disc 22 ...... Slit 23 ...... Light emitting element 24 ...... Light receiving element 25 ...... Pulse encoder circuit 30 ...... Multiplier circuit 40 ...... Thinning frequency dividing circuit 41 ...... Thinning circuit 42 ...... Dividing circuit 43,44,45 …… Setter 46 …… Calculator 50 …… Motor device 60 …… Working device 61 …… Main roller 62 …… Film 63 …… Driven roller

Claims (2)

[Claims] 1. A rotation output section of a main machine drive system,
A pulse encoding means for outputting a main pulse train having a pulse interval change corresponding to the change of the rotation speed of the rotation output unit, and the main pulse train processed to obtain the number of pulses per predetermined time of the main pulse train at a set ratio. A pulse frequency conversion means for reducing the pulse frequency by the pulse frequency conversion means, a setting part for setting the pulse reduction ratio by the pulse frequency conversion means, and a motor device for synchronously driving the working device by the pulse train obtained from the pulse frequency conversion means. A control device characterized by the above. 2. A power conversion means for converting rotational power of a main machine drive system into a reciprocating rotary motion, and a main pulse train having a pulse interval change corresponding to a speed change of the reciprocating rotary motion converted by the power converting means is output. Pulse encoding means for processing the main pulse train to reduce the number of pulses per predetermined time of the main pulse train at a set ratio, and a pulse reduction ratio by the pulse frequency conversion means. A control device comprising: a setting unit; and a motor device that synchronously drives a work device by a pulse train obtained from the pulse frequency conversion means.