JPS592600B2 - Interlocking device between two devices - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an interlocking device between two pieces of equipment that starts the other piece of equipment at a timing corresponding to the rotational speed of a predetermined rotating shaft of one piece of equipment. In order to always stop the main shaft (such as a crankshaft) of a machine at a predetermined position regardless of its operating speed, it relates to a device that starts the other device, the brake, at an optimal timing in accordance with the rotational speed of the main shaft.

The present invention provides the above-mentioned interlocking device that can reliably follow the change and start the other device at the optimum timing even if the rotational speed of a predetermined rotating shaft in one device changes. It is.

Hereinafter, two embodiments of the present invention will be described in detail with reference to the drawings.

First, an embodiment will be described in which the present invention is applied to a crank press as one device and a brake installed therein as the other device.

In a crank press, a certain amount of time is required from when a stop signal is sent to the brake until the brake is activated and the crankshaft actually stops, and the crankshaft also rotates to a certain extent during this time.

The total brake/slip angle θ is the rotation angle of the crankshaft from when the press machine stop signal (hereinafter referred to as the brake start signal) is sent until the crankshaft comes to a complete stop.
If 0, this is the idle running angle θ1 from when the start signal is sent until the braking action by the brake starts, and the slip angle θ2 until the brake completely absorbs the rotational energy.
It is expressed as the sum of

Generally, the free running angle θ1 is proportional to the rotational speed of the crankshaft (therefore, the press stroke (r, p, m,)), so the total brake slip angle θ2 increases or decreases depending on the number of strokes. .

Therefore, in order to always stop the slide of the press at a predetermined position, for example, at top dead center, regardless of the number of strokes, it is necessary to change the time point at which the brake start signal is generated in accordance with the number of strokes so as to have the optimum timing.

This is particularly important in press machines with variable stroke mechanisms.

An example of a device for controlling the timing at which a brake start signal is generated according to the number of press strokes is shown in Fig. 1.
The output signal waveforms from each circuit in this figure are shown in FIG. 2A, and the relationship between the rotation angle of the crankshaft and the operation of the circuits is shown in FIG. 3, respectively.

In these drawings, a pulse generator 1 outputs equally spaced pulses A having a frequency proportional to the rotational speed of the crankshaft.

This series of pulses A is an AND circuit (gate circuit) 6, 7
sent to.

The operating range setting device 2 sets the operating range of the device shown in Fig. 1, and defines a predetermined range within one rotation of the crankshaft as an operating range N, and performs an opening operation when the rotation angle of the crankshaft is within this range. Continue outputting signal B.

The movement range N is preferably set to the upward stroke of the slide, and is, for example, from an angular position p that slightly passes 180 degrees of the crankshaft (bottom dead center) to a position q of 00 (top dead center).

Specifically, this operating range setting device 2 includes a cam attached to a rotating shaft that rotates coaxially with or synchronously with the crankshaft, and a limit switch that is turned on and off by this cam.
It can be configured with a switch.

The timer 3 is set with a predetermined set time t, which serves as a reference for measuring the rotational speed of the crankshaft.

This timer 3 is started by the rise of the operation signal B, outputs the first counting end signal C after a set time has elapsed from this point, and is reset by the fall of the operation signal B.

Timer 3 also generates an output when the crankshaft is at position p.
This means that the crankshaft has rotated from position p to r during the set time.

This position r changes depending on the rotational speed of the crankshaft.

Since the inverted signal of the output C of the timer 3 and the operation signal B are sent to the AND circuit 5, the AND circuit 5 outputs the time t from the rising edge of the operation signal B until the first counting end signal C is output. The output signal is sent to the AND circuit (first gate circuit) 6, and its gate is opened for the period t.

The preset counter 8 has a required set value set in advance, counts the pulses sent through the AND circuits 6 and 7, and starts the brake when this counted value reaches the set value. Outputs signal (timing signal) G.

This counter 8 starts at the rising edge of the operation signal B and is reset at the falling edge.

Since pulses are inputted from the pulse generator 1 via the AND circuit 6 only during the set time t, the counter 8 counts these pulses.

This is referred to as the first counting operation. The number of pulses L1 counted by this first counting operation is proportional to the rotational speed of the crankshaft.

Note that the set value is set to a value larger than the count value L1 at the set time t for any rotational speed of the crankshaft within the operating range of the press machine.

Therefore, during this period t, the signal G is not output from the counter 8, and the counter 8 temporarily stores the first count value L1.

The reference position setter 4 sets the second position when the rotation angle of the crankshaft reaches a predetermined angular position U (reference position) within the operating range N.
It outputs a counting signal E and maintains this signal E until the falling edge of the operating signal B.

The reference position setter 4, like the operating range setter 2, can be realized by a cam and a limit switch.

The reference position U is set closer to the top dead center than the position r for any rotational speed of the crankshaft within the operating range of the press machine.

When the rotation angle of the crankshaft passes the position r and reaches the reference position U, the second count signal E is output, so the gate of the AND circuit (second gate circuit) 7 is opened, and the pulse generator 1 Pulse A is sent to counter 8 via this circuit 7.

Therefore, the counter 8 starts the second counting operation and the first
The number of pulses is counted while being added to the count value L1.

Then, when the total count value of counter 8 reaches the set value,
A brake starting signal G is output.

At this time, the rotation angle of the crankshaft is at a certain position W between the reference position U and the top dead center, and the angular difference between this position W and the reference position U is equal to the set value of the counter 8 and the first Count value L
It is proportional to the difference from 1.

The angular position W of the crankshaft at which the engine start signal G is output varies depending on the rotational speed of the crankshaft.

That is, when the rotational speed of the crankshaft is slow, the first count value L1 is also a small value, and therefore the difference from the set value becomes large, so the position W is closer to the top dead center.

On the other hand, when the rotation speed of the crankshaft is high, the first count value L1 becomes a large value, so the difference between this count value L1 and the set value becomes small, and the position W is far from the top dead center. Shifts to the far side closer to the reference position U.

Therefore, since the timing at which the brake start signal is generated changes depending on the rotational speed of the crankshaft and therefore the total brake slip angle θ2, the crankshaft is always at a predetermined position (for example, top dead center) at any rotational speed. It will be completely stopped.

Furthermore, when the rotation angle of the crankshaft reaches 0°,
As a result of the fall of operation signal B, all operations are completed.

Then, when the position p is reached again, the above operation is repeated.

FIG. 4 shows a modification of the reference position setting device 4. As shown in FIG.

Here, the reference position setter 4 has a set value Lo corresponding to the reference position U set in advance, and a recent counter 9 that outputs a second count signal E1 when the counted value reaches this set number Lo. and a gate circuit 10 that is connected between the counter 9 and the pulse generator 1 and opens the gate only when the operation signal B is output.

When the crankshaft passes through position p and the operation signal B is output, the gate of the gate circuit 10 is opened, so the pulse A from the pulse generator 1 is input to the counter 9, and the counter 9 starts counting operation. do.

No matter what speed the crankshaft is rotating, the counted value of the counter 9 will reach its set value Lo only when the crankshaft reaches the reference position U. A count signal E1 is output (see Figure 2).

The other configuration in FIG. 4 is the same as that shown in FIG. 1, and it will be easily understood that even if the above-described reference position setting device is used, exactly the same operation will be performed.

Next, an embodiment will be described in which the present invention is applied to a transfer device as one device and one or several press machines as the other device.

As shown in Fig. 5, the transfer press line includes one transfer device 1 that is independently driven and continuously operated.
1, and a plurality of press machines 12 that are started at appropriate timings according to the operating speed of this device 11 and operated intermittently at the same constant speed are arranged.

The transfer device 11 is equipped with a pair of left and right feed bars equipped with fingers, and the feed bars move forward by gripping the material or semi-finished product with the fingers, and then move back by releasing the material etc. A series of rectangular movements are performed to move the material etc. between or within the press machines 12.

The press machine 12 is interlocked with the feed bar 13
While the robot is making a backward movement, the machine is operated to process the materials, etc. that have been transported.

By the way, when the operating speed of the transfer device 11, that is, the forward and backward movement speed of the feed bar 13 is changed, it is necessary to prevent interference between the feed bar 13, fingers, etc., and the press mold, and therefore damage thereof. At the same time, in order to improve the efficiency of the line, the starting timing of the press machine 12 must be optimally adjusted according to the above-mentioned movement speed.

Press machine 1 according to the operating speed of transfer device 11
Adjustment of the activation timing in step 2 is realized by the interlocking device shown in FIG.

FIG. 6 shows the stroke curves of the feed bar 13 and the press machine 12 in the transfer device 11.

In this figure, the feed bar 13 first moves forward while gripping the material, then moves outward (in the direction of moving away from each other) in parallel to release the material, and then retreats and moves further inward. Repeat the action of grabbing the material, etc. while moving towards each other (in the direction of approaching each other).

One cycle of these series of operations exactly corresponds to one rotation of the main shaft of the transfer device 11, and since this main shaft is continuously rotated, the above-mentioned operations are also performed continuously without interruption.

On the other hand, the press machine 12 is started in the vicinity of the release operation I of the feed bar 13, press work is performed while the feed bar 13 is in the retreating operation J, and is stopped during the gripping operation. During this time, the crankshaft is rotated once.

While the feed bar 13 is in the forward motion H, it is on standby at the top dead center.

The pressing operation is performed once during one cycle of the transfer device 11, and is performed intermittently.

Now, the pulse generator 1 in the interlocking device is attached to the main shaft of the transfer device 11 or a rotating shaft that rotates in synchronization with the main shaft.

Then, the operation start point P of the operation section setter 2 is made to correspond to the start point of the forward motion H, and the completion point 9 is made to correspond to the completion point of the release motion.

The reference position U of the reference position setter 4 is made to correspond to the vicinity of the end point of the forward movement H.

A position r corresponding to the end of the first count of the counter 8 exists between positions p and U.

Therefore, when the operating speed of the transfer device 11 is slow, the first count value L1 of the counter 8 becomes a small value, so the difference between the set value and the first count value L□ increases, and In the second counting operation of the counter 8 that is started, it is relatively slow for the total count value of the counter 8 to reach the set value, and the starting signal G of the press machine 12 (corresponding to the starting signal of the brake in the above embodiment) The position W corresponding to the time point when the timing signal) is generated is close to the position q.

On the other hand, when the operating speed of the transfer device 11 is fast, the first count value L1 of the counter 8 becomes a large value, so the difference from the set value becomes small, and the time point when the start signal G of the press machine 12 is generated. The position W corresponding to , moves closer to the reference position U.

In this way, since the startup timing of the press machine 12 is automatically adjusted according to the operating speed of the transfer device 11, regardless of the operating speed of the transfer device 11,
Pressing is always performed during the backward movement of the feed bar 13, so that the molds and the like do not collide with the feed bar 13 or its fingers, and damage to these is prevented. , efficiency improvements in the transfer press line are also achieved.

It goes without saying that the apparatus shown in FIG. 4 can also be applied to this embodiment.

As explained in detail below, according to the present invention, whether two devices are a press machine and its brake, a transfer device and a press machine, or between other devices, According to the rotational speed of a predetermined rotating shaft in one device, the start timing of the other device can be optimally and automatically adjusted.

Then, by appropriately changing the operating range of the operating range setting device, the reference position of the reference position setting device, the timer setting time, the counter setting value, etc., it is possible to sufficiently cope with a wide range of speed changes of the specified rotating shaft of one of the devices. Obtainable.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a block diagram of an interlocking device, FIG. 2 is a time chart of the block diagrams shown in FIGS. 1 and 4, and FIG. An explanatory diagram showing the relationship between the rotation angle of the crankshaft and the operation of the above block diagram when applied to a machine and its brake,
Fig. 4 is a block diagram showing a modified example, Figs. 5 and 6 show a case where the present invention is applied to a transfer device and a press machine, Fig. 5 is an arrangement diagram, and Fig. 6 is a stroke curve diagram. It is. 1... Pulse generator, 2... Operation range setter, 3... Timer, 4... Reference position setter, 6...・AND circuit (first gate circuit), 7...AND circuit (second gate circuit), 8
...Preset counter (counter).

Claims (1)

[Claims] 1. A device for starting another device at a timing corresponding to the rotational speed of a predetermined rotating shaft in one device, the device comprising:
an operation range setting device that continues to output an opening operation signal in which the rotation angle of the rotary shaft is within this range, with a required range of one rotation of the rotary shaft as an operation range; and a frequency corresponding to the rotational speed of the rotary shaft. a pulse generator that outputs pulses of A timer that starts and outputs a first counting end signal after a required set time has elapsed and is reset by the falling edge of the operation signal; A reference position setter that continues to output the second counting signal from the time when the required angular position within the section is reached until the time when the operation signal falls, and the reference position setter is connected in parallel between the pulse generator and the counter. It consists of a first and a second gate circuit, and the first gate circuit is controlled to open its gate from the rising edge of the operation signal until the first counting end signal is output based on the timer. , the gate of the second gate circuit is opened while the second counting signal is being outputted, and the counter calculates the pulse input while the gate of the first gate circuit is open, and the pulse of martyrdom. 1 count is performed, and after that, from the time when the gate of the second gate circuit is opened, the number of pulses inputted through the second gate circuit is added to the first count value and counted again, and the total count value is obtained. An interlocking device between two devices, which outputs a timing signal when the above-mentioned required setting value is reached.