JPH05185297A - Device for generating control signal in press machine - Google Patents

Abstract

PURPOSE:To safely and surely execute the adjustment of developing timing in the various kinds of control signals to the shifting position of a press ram in high workability without needing any tool. CONSTITUTION:In a control signal generating device in a press machine for generating the prescribed control signal in every time when the press ram 1 positions each position in plural prescribed shifting positions, it is detected that the press ram 1 is positioned in the front of each of plural prescribed shifting positions, where the press ram 1 generates the control signal, and proximity switches 33, 35, 37 individually outputting prepositional detecting signal at every time when the press ram positions in the front of each position, are provided and by synchronizing with the input of the pre-positional detecting signal, time count is executed by preset counters 49, 51, 53 and the prescribed control signal is outputted in the count value, which is variably set.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control signal generator for a press machine, and more particularly to a control signal generator for a press machine which generates a predetermined control signal each time the press ram is located at each of a plurality of predetermined movement positions. It relates to the device.

[0002]

2. Description of the Related Art In a press machine, a stop position of a press ram is determined in addition to a top dead center detection signal indicating that the press ram is located at the top dead center position for various press workings including nibbling. The press ram has a predetermined movement, such as a clutch disengagement signal, a workpiece movement timing during nibbing, a nibbling start signal to determine punching timing, and a punch completion signal that determines the workpiece movement timing after cycle punching. A control signal is required to indicate that each of the positions has been located.

Conventionally, a device for generating control signals such as a top dead center detection signal, a clutch disengagement signal, a nibbling start signal, and a punch completion signal as described above has a control signal for a tog drum which rotates integrally with a crankshaft for driving a press ram. Each dog is attached individually and the proximity switch fixedly arranged corresponding to each dog is used to detect the approach of each dog due to the rotation of the crankshaft by the proximity switch corresponding to each dog. However, control signals such as a top dead center detection signal, a clutch disengagement signal, a nibbling start signal, and a punch completion signal are directly generated by dog detection by each proximity switch.

[0004]

The generation timing of the top dead center detection signal with respect to the moving position of the press ram needs to be fixedly set or variably set because the top dead center position of the press ram is mechanically unchanged. Although not provided, the clutch disengagement signal, the nibbling start signal, the punch completion signal, etc. need to be variably set in terms of the generation timing with respect to the moving position of the press ram according to various conditions of press working.

In the conventional control signal generator as described above, the adjustment of the generation timing of various control signals such as the clutch disengagement signal, the nibbling start signal, and the punch completion signal with respect to the moving position of the press ram is performed by mounting the dog on the dog drum. This is done by physically changing the position.

This change of the dog mounting position must be performed mechanically by using a tool, so that it takes time to adjust the generation timing of various control signals, and it is difficult to perform precise adjustment. There is a problem called.

Further, in general, the dog drum is directly connected to the crankshaft and is located at a high place together with the crankshaft. This also makes the workability of adjusting the dog mounting position poor.

The present invention has been made by paying attention to the above-mentioned problems in the conventional control signal generator for a press machine. The clutch disengagement signal, the nibbling start signal,
A press machine improved so that adjustment of the generation timing of various control signals such as punch completion signals with respect to the moving position of the press ram can be performed with good workability, safety, and surely and highly accurately without the need for tools. It is an object of the present invention to provide a control signal generator of the above.

[0009]

According to the present invention, the above-described object is to generate a control signal for a press machine that generates a predetermined control signal each time the press ram is located at each of a plurality of predetermined movement positions. In the apparatus, it is detected that the press ram is located at a position before each of a plurality of predetermined moving positions where a control signal should be generated, and the pre-position detection is performed each time the press ram is located at each of the front positions. A moving position detecting means for outputting a signal, and a control signal for time counting in synchronization with the moving position detecting means outputting the pre-position detecting signal, and for outputting a predetermined control signal at a variably set count value. And a control means for generating a control signal for a press machine.

[0010]

According to the above-mentioned structure, the control signal is output after a predetermined time corresponding to the count value has elapsed after the movement position detection means outputs the pre-position detection signal, and the control signal is output with respect to the movement position of the press ram. The generation timing can be adjusted freely by changing the count value.

[0011]

Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of a control signal generator for a press machine according to the present invention. In FIG. 1, reference numeral 1 indicates a press ram. The press ram 1 is drivingly connected to the crankshaft 5 by the connecting member 3, and
Is reciprocated in the up-down direction by the rotation of and the striker 7 presses the punch 9. A die 11 is fixedly arranged below the punch 9.

The crankshaft 5 is selectively drivingly connected to a flywheel 15 by a clutch 13, and the flywheel 15 is rotationally driven at a predetermined speed by an electric motor 17.

A dog drum 19 is integrally attached to the bearing shaft portion 5a of the crankshaft 5. Dog drum 1
On the outer peripheral portion of 9, there are four dogs, a top dead center detection signal dog 21, a clutch disengagement signal dog 23, a nibbling start signal dog 25, and a punch completion signal dog 27, each having a predetermined rotational phase. Fixedly mounted in position.

The fixed-side member 29 individually corresponds to the top dead center detection signal dog 21, the clutch disengagement signal dog 23, the nibbling start signal dog 25, and the punch completion signal dog 27, respectively. Proximity switch 31 for point detection signal
The clutch disconnection signal proximity switch 33, the nibbling start signal proximity switch 35, and the punch completion signal proximity switch 37 are fixedly mounted.

The proximity switch 31 for the top dead center detection signal, the proximity switch 33 for the clutch disengagement signal, the proximity switch 35 for the nibbling start signal, and the proximity switch 37 for the punch completion signal are for the top dead center detection signal due to the rotation of the crankshaft 5. The dog 21, the clutch disengagement signal dog 23, the nibbling start signal dog 25, and the punch completion signal dog 27 are individually opened and closed to turn on / off signals as shown in FIGS. 2 (a) to 2 (d). The output is provided to the input unit 41 of the NC device 39.

The mounting position of the dog 21 for the top dead center detection signal is
Similarly to the conventional case, when the press ram 1 is actually located at the top dead center position, the press ram 1 is set at a position approaching the proximity switch 31 for the top dead center detection signal. Is a position close to the clutch disengagement signal proximity switch 33 when the press ram 1 is located at a position before the travel position where the clutch disengagement signal should actually be generated, and the mounting position of the nibbling start signal dog 25 is actually When the press ram 1 is located at a moving position before the moving position at which the nibbling start signal should be generated, the punch 27 is set at a position close to the proximity switch 35 for the nibbling start signal, and the punch 27 is actually attached at the punch completion signal. When the press ram 1 is located at the moving position before the moving position at which the punch should be generated, the punch completion signal proximity switch 3 They are respectively set at a position close to.

Accordingly, the ON / OFF signals output from the clutch disengagement signal proximity switch 33, the nibbling start signal proximity switch 35, and the punch completion signal proximity switch 37 are the predetermined movements at which the press ram 1 should generate a predetermined control signal. It is input to the input unit 41 of the NC device 39 as a pre-position detection signal for detecting that it has been positioned before the position.

The on-off signal (FIG. 2) output from the proximity switch 31 for the top dead center detection signal and input to the input section 41 is used.
(A)) is the NC device 3 as the top dead center detection signal as it is.
It is used in the programmable controller etc. in 9.

The input section 41 includes trigger generation sections 43, 4
5, 47 are connected, and the pre-position detection signal for the clutch disengagement signal input to the input unit 41 from the clutch disengagement signal proximity switch 33 is supplied to the trigger generation unit 43 and the nibbling start to the trigger generation unit 45. The pre-position detection signal for the nibbling start signal input to the input unit 41 from the signal proximity switch 35 is transmitted to the trigger generation unit 47 by the punch completion signal input to the input unit 41 from the punch completion signal proximity switch 37. The pre-position detection signal for each is individually input.

Each of the trigger generators 43, 45 and 47 generates a trigger signal as shown in FIGS. 2 (e) to 2 (g) when the input signal, that is, the pre-position detection signal changes from on to off. The trigger signal is sent to the trigger generator 4
It outputs to preset counters 49, 51 and 53 which are individually connected to 3, 45 and 47, respectively.

The preset counters 49, 51 and 53 are
Each of them is given a clock signal by a pulse signal of a constant frequency from the clock generator 55, and the trigger generator 43,
When the trigger signals from 45 and 47 are used as start signals, the number of pulses of the clock signal is counted, that is, the time count is performed, and when this reaches a predetermined count value, FIG.
A count-up signal as shown in (h) to (j) is connected to each of the preset counters 49, 51 and 53, a clutch disengagement signal generator 57, a nibbling start signal generator 59, and a punch completion signal generator 61. It outputs to and stops the time count and resets.

Count value setting sections 63, 65 and 67 are individually connected to the preset counters 49, 51 and 53, respectively. The count value setting units 63, 65, 67 are externally operated by the user, and the count value setting unit 63 sets the count value of the preset counter 49 to the count value setting unit 65.
Indicates that the count value of the preset counter 51 and the count value setting unit 65 individually and variably set the count value of the preset counter 53.

The clutch disengagement signal generator 57 is configured to generate a clutch disengagement signal having a predetermined width as shown in FIG. 2 (k) by inputting a count-up signal from the preset counter 49.

The nibbling start signal generator 59 is configured to generate a nibbling start signal of a predetermined width as shown in FIG. 2 (l) by inputting a count-up signal from the preset counter 51.

The punch completion signal generator 59 is configured to generate a punch completion signal having a predetermined width as shown in FIG. 2 (m) by inputting a count-up signal from the preset counter 53.

The signal width of each of the clutch disengagement signal, the nibbling start signal and the punch completion signal has a default value according to the signal width corresponding to each control signal, which is set by the signal width setting units 69, 71 and 73. Each can be variably set by an external operation.

According to the above configuration, the clutch disengagement signal proximity switch 33 provides the pre-position detection signal for the clutch disengagement signal as shown in FIG. 2B when the clutch disengagement signal dog 23 approaches. The signal is output to the input unit 41, and the trigger generation unit 43 outputs the trigger signal as shown in FIG. 2E to the preset counter 49.
As a result, the preset counter 49 starts time counting, and when it reaches the count value variably set by the count value setting unit 63, the count-up signal as shown in FIG. Output to 57. As a result, the clutch disengagement signal generator 57 is set to
A clutch disengagement signal having a predetermined width as shown in (k) is generated.

The proximity switch 35 for the nibbling start signal outputs a pre-position detection signal for the nibbling start signal to the input section 41 as shown in FIG. 2C when the dog 25 for the nibbling start signal approaches. As a result, the trigger generator 45 outputs a trigger signal as shown in FIG. 2 (f) to the preset counter 51. As a result, the preset counter 51 starts time counting, and when it reaches the count value variably set by the count value setting unit 65, the nibbling start signal generating unit outputs a count up signal as shown in FIG. Output to 59. As a result, the clutch disengagement signal generator 59 generates a nibbling start signal having a predetermined width as shown in FIG.

When the punch completion signal proximity switch 37 approaches the punch completion signal dog 27, a pre-position detection signal for the punch completion signal as shown in FIG. 2C is output to the input section 41. As a result, the trigger generator 4
7 outputs a trigger signal as shown in FIG. 2 (g) to the preset counter 53. As a result, the preset counter 53 starts time counting, and when it reaches the count value variably set by the count value setting section 67, the punch-up signal generating section outputs a count-up signal as shown in FIG. Output to 61. As a result, the punch completion signal generator 61 generates a punch completion signal having a predetermined width as shown in FIG.

In this case, the count value setting section 6 is used to adjust the generation timing of the clutch disengagement signal, the nibbling start signal, and the punch completion signal with respect to the moving position of the press ram 1.
Preset counters 49, 5 by 3, 65, 67
Only by changing the setting of the count values of 1, 53, the clutch disengagement signal dog 23 and the nibbling start signal dog 2
5. It can be freely performed without changing the mounting position of the punch completion signal dog 27.

In addition, the trigger generators 43, 45 and 47,
The preset counters 49, 51, 53, the clutch disengagement signal generation unit 57, the nibbling start signal generation unit 59, and the punch completion signal generation unit 61 may be configured by either hardware configuration or software configuration. Can be easily configured with high reliability.

Further, as means for outputting a signal after inputting the pre-moving position detection signal and after a variable predetermined time has elapsed,
Besides the preset counter, a variable delay element having a software configuration or a hardware configuration may be used.

In the above, the present invention has been described in detail with respect to a specific embodiment, but the present invention is not limited to this, and various embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art.

[0035]

As can be understood from the above description, according to the control signal generator for a press machine of the present invention, the moving position detecting means such as the proximity switch outputs the pre-position detecting signal and then responds to the count value. After a predetermined time has elapsed, control signals such as a clutch disengagement signal, a nibbling start signal, and a punch completion signal are output.Adjustment of the generation timing of these control signals with respect to the moving position of the press ram requires changing the dog mounting position. Since it is performed by changing the setting of the count value without performing the adjustment, adjustment of the generation timing of various control signals such as the clutch disengagement signal, the nibbling start signal, and the punch completion signal with respect to the press ram movement position
It becomes possible to perform work accurately, safely, reliably and with high precision without using a tool.

In this control signal generator, the moving position detecting means must be provided for each control signal in order to obtain the pre-position detection signal for each control signal. It is given, and by this, each control signal is output individually and each control signal is output.For example, time counting is continuously performed for one press cycle in synchronization with the top dead center detection signal, and each time this reaches a predetermined value. Compared to the case of outputting a predetermined control signal, it is less susceptible to the error due to fluctuations in the rotation speed of the crankshaft, the correction is no longer necessary, and when the press ram stops in the middle of vertical movement, The subsequent control signals are not erroneously output, and the reliability of the control signals is improved.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a control signal generator for a press machine according to the present invention.

FIG. 2 is a time chart showing an operation example of the control signal generation device of the press machine according to the present invention.

[Explanation of symbols]

 1 Press ram 5 Crankshaft 21 Top dead center detection signal dog 23 Clutch disengagement signal dog 25 Nibbling start signal dog 27 Punch completion signal dog 31 Top dead center detection signal proximity switch 33 Clutch disengagement signal proximity switch 35 Nibbling start Proximity switch for signal 37 Proximity switch for punch completion signal 39 NC device 43, 45, 47 Trigger generator 49, 51, 53 Preset counter 57 Clutch disengagement signal generator 59 Nibbling start signal generator 59 61 Punch completion signal generator 63, 65, 67 Count value setting section

Claims (1)

[Claims] 1. A control signal generator for a press machine, which generates a predetermined control signal each time the press ram is located at each of a plurality of predetermined movement positions, wherein a plurality of press rams are to generate the control signal. Of each of the predetermined movement position of the detected position, the press position each time the press ram is located at each of the front position, a movement position detection means for outputting a pre-position detection signal, and the movement position detection means A press machine comprising: a control signal generating unit that performs time counting in synchronization with outputting the pre-position detection signal and outputs a predetermined control signal at a count value that is variably set. Control signal generator.