JPS5964200A - Device for stopping variable speed press at home position - Google Patents

Abstract

PURPOSE:To provide a titled device which has improved operability, safety and feed accuracy by the constitution wherein the output angle for a stop signal set with a digital switch is automatically selected according to an operating speed and the stop signal is outputted when the prescribed crank angle is attained. CONSTITUTION:When the operating speed of a variable speed press is changed over, a speed signal is outputted from a multi-stage switch 1 of a speed setter to a selection circuit 4, which selects the output angle of the stop signal corresponding to various operating speeds set beforehand in digital switches 3,... and connects the same to the reference terminal of a comparator 5. On the other hand, the revolution of a crank shaft by the operation of the press is counted as the pulse from a crank angle sensor 2 in a counter 6 and is inputted from the comparison terminal of the comparator 5, which outputs the stop signal by driving an output relay 8 through a storage circuit 7 when the crank angle signal coincides with the optional reference value set by the switch 3.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fixed position stopping device for a variable speed press that improves the fixed position accuracy and increases safety and feeding accuracy.

In a variable speed press, the slip angle of the press required from the six stop signal output ports until the press actually stops changes depending on the operating speed. For this reason, if the output timing (angle) of the stop signal is fixed, the fixed position will change as the operating speed changes.
There is a problem that the safety of the press and the feeding accuracy are reduced. For this reason, conventionally, each time the operating speed of the press was changed, the wiring at the terminal block was changed, and the output timing of the stop signal (
Since the angle) is changed, there is a drawback that troublesome adjustment work is required to improve the accuracy of stopping at a fixed position.

The present invention was made in view of the above-mentioned circumstances, and when the operating speed of the press is changed, the output timing (angle) of the stop signal is automatically changed according to the operating speed. The purpose of this invention is to improve the operability, safety, and feeding accuracy of variable speed presses by providing a fixed position stop device.

The present invention will be explained in detail below based on an illustrated embodiment.

A speed setting device (not shown) for setting the operating speed of a variable speed press (not shown) is provided with a speed setting device multi-stage switch 1 that outputs a speed signal according to the output of the speed setting device (operating speed of the press). The press is provided with a photoelectric crank angle sensor 2 that outputs a pulse signal every time the crankshaft of the press rotates by a unit angle.

3.3. ... is a two-digit digital switch.

The output timing (angle) of each stop signal can be set arbitrarily. And each digital switch 3,
3 is connected to the input terminal of the selection circuit 4 controlled by the speed setting Z-blade multi-stage switch 1, and the output terminal of the selection circuit 4 is connected to the reference terminal of the comparator 5. An output terminal of a counter 6 that counts pulses output from the crank angle sensor 2 is connected to a comparison terminal of a comparator 5. Then, the output of comparator 5 ":L,!
When the crank angle signal supplied to JJ' via the memory circuit 7 to the output relay 8 matches an arbitrary reference value set by the digital switch 3, the relay 8 is driven to 1 and a -C stop signal is output. It has become. 9 is a counter reset signal, and 10 is an external takeout signal.

In the configuration described in 2, when the operating speed of the variable speed press is not set (when the speed setting device (not shown) is operated, a speed signal corresponding to the set speed is supplied from the speed setting device multi-stage switch 1 to the selection circuit 4. i'shiru. In addition, Digiswitch 3
,3. ···for.

It is not necessary to explain in detail that the stop signal output timing (angle) in response to various operating speeds is set in advance.

Furthermore, when a speed signal is supplied as described in section 2, the digital switch 3, which controls the output timing in response to the speed, is connected to the reference terminal of the comparator 5 via the selection circuit 4. Ru.

On the other hand, when the press is operated and the crankshaft rotates, one pulse is supplied from the crank angle sensor 2 to the counter 6 for each unit angle. Then, when a counter set signal 9 is output by a rotary cam switch or the like at a predetermined angle before the bottom dead center, the counter 6 starts counting from this point, and the memory circuit 7 is cleared by the counter set signal 9.

In this way, when the count value (crank angle) of the pulses output from the crank angle sensor 2 for each unit angle matches the output time M (angle) supplied via the selection circuit 4, the comparator 5 Output is 11: [, +1 to 'I-
I'', the output relay 8 is driven 5, and the stop signal is output. Therefore, no matter how you change the operating speed of the press, the angle corresponding to the slip angle corresponding to each operating speed will be moved toward you from the fixed position. Since the stop signal is output at the point in time, fluctuations in the stop position due to changes in operating speed can be reduced.

It is preferable that the number of digiswitches 3 is the same as the number of steps set for the operating speed, but if the fixed position stopping accuracy is not so rough, the number of digiswitches 3 should be greater than the number of steps for the operating speed.
Reduce the number of.

Alternatively, the number of digiswitches 3 is the same as the number of steps at the regular operating speed, and when operating at other operating speeds with less frequency, the output timing (angle) of the stop signal is changed by operating the din switch 3. You may also do this.

As explained above, according to the present invention, the output timing (angle) of the stop signal can be arbitrarily set without changing the wiring at the terminal block as in the conventional case.

Moreover, the optimum timing is automatically selected from among the multiple output timings set in advance with the DIN switch, and a stop signal is generated when the press timing is reached. Since the variable speed press is configured to output a large amount of output, it is possible to improve safety and feed accuracy by increasing the fixed position stop M degree of the variable speed press without deteriorating operability.

[Brief explanation of the drawing]

The figure is a block diagram of one embodiment of the present invention. ■...Speed setter multi-stage switch 2 ・Screw angle sensor 3...Digi switch 4
...Selection circuit...Comparator 6...Counter 8...Output relay 9...Counter reset signal patent Applicant AIDA Engineering Co., Ltd. Shirokawa 1 person J Physician Kiyoshi Nakayama (and 1 other person)

Claims (1)

[Claims] There are multiple digital switches that can arbitrarily set the output angle of the stop signal, a speed setting multi-stage switch that selects the digital switch connected to the reference terminal of the comparator according to the operating speed of the press, and a speed setting switch that can adjust the crank angle of the press. a crank angle sensor that detects and supplies the signal to the comparison terminal of the comparator; and an output relay that outputs a stop signal when the crank angle signal supplied to the comparison terminal of the comparator matches the set angle signal supplied to the reference terminal. Fixed position stop device for variable speed press.