JPS5828067B2 - Transfer machine start/stop control circuit - Google Patents

Description

[Detailed Description of the Invention] The present invention provides, for example, an independent transfer machine, that is, a self-driving machine or a standalone self-driving machine having a transfer device that performs operations such as machining and parts assembly. In a transfer machine that is connected by a transfer device and can be started and stopped as a whole, each individual machine is started by detecting the presence of a workpiece at the entrance of each machine, and after the transfer has been operated a specified number of times after there is no workpiece at the entrance. The present invention also relates to a start/stop control device for a lance-force machine, which stops the machine when there is no workpiece at the entrance.

In the case of conventional continuous operation standalone transfer machines that perform machining and automatic assembly, the starting condition for each cycle of the machine is detection of a workpiece at the entrance, and stopping is based on detection of a full workpiece at the exit. If the workpiece is not transported, even if there is a workpiece in the machine, it cannot be processed and taken out, and if the machine in the previous process stops, the machine in the next process will also stop.

On the other hand, with a control circuit that operates continuously regardless of workpiece detection at the entrance, the machine ends up continuing to run idly even if there is no workpiece inside the machine.

These drawbacks are particularly problematic in machines that process many types of workpieces, and the machine cannot be set up unless the old workpiece is taken out. The conventional method was inconvenient because the machine would stop if the machine stopped.

However, if continuous operation is performed regardless of the workpiece detection at the entrance, the scraping machine that the operator does not give a stop command will run idly even when the last workpiece has been unloaded, leading to an increase in operating costs. was.

In order to eliminate the above-mentioned problems, the present invention provides a limit switch for detecting the presence of a workpiece at the entrance for each machine, and combines this with a counting device that counts 1 every time the transfer conveys 1 pitch. When the required number of transfers is reached, a signal to stop the automatic cycle is issued.

When the entrance work presence limit switch detects the presence of a workpiece at the entrance, it resets the counting device and controls the machine to automatically start. Continuous motion that automatically runs all the machines without having to operate each machine by simply inputting the machine into the first machine and giving instructions using a push button, etc., and automatically stops after discharging the workpieces in all the machines. It is to make it possible.

The present invention will be explained below with reference to Examples.

FIG. 1 is a plan view showing an example of an independent transfer machine, in which single machines numbered 1 to 2 are lined up in a straight line, and workpieces are received by the general transport devices t1 to t8 and ml each has. It is transferred and conveyed from each entrance to the processing units 1-u1 to u6, and sent to the entrance of the next machine.

In the machine shown in Figure 1, Lll y 02 + 031
u5 is a machining work unit, u4 is a work unit for assembly, u6 is a workpiece reversing unit, u7 is a unit that performs machining from three directions simultaneously, and ml is a maniplex that transports the workpiece from the transfer to the machining position of u7, and is a transfer device. From tl to t5 is a lift-and-carry type, and t7 and t8 are transfer bars that move in parallel with a work lick in the middle.

The mechanism of this machine is simplified in Figure 2, where a = f
The series of actions up to this point sends one pitch work.

In Fig. a, a workpiece A is transported by a pre-processing machine 1, and a workpiece E is taken out by a post-processing machine 3.

During this time, the transfer of machine 2 is stopped at an intermediate position and does not collide with the transfers of machine 1 and 3.

Next, in figure b, the transfer 2 of one machine moves forward, and at this time, the limit switch I with inlet work is turned ON.
The full work limit switch ■ is OFF.

Further, the transfer moves upward in figure C, moves backward in figure d and sends one pitch work, and in figure e the transfer descends and returns to the original position in figure f.

Therefore, if the workpiece is not carried into the second machine after workpiece A, in order for workpiece A to reach the exit, a ” f
It turns out that it is good to repeat the cycle four times.

Namely. If the inlet work limit switch is OFF and four cycles have been counted, there will be no work in the second machine, so the machine can be stopped.

In any case, when the workpiece is transferred to the entrance and the limit switch I is turned on, the counting is reset and the machine repeats the operation.

A control circuit for realizing this is shown in FIG.

Here, CTR1 is a preset readout type counter that performs the counting function, and one turn 1 to contact 1 is sent by one turn ON/OFF of the count coil.

Presetting is done by manually setting the mouth position.

In the case shown in Figure 2, set the CTR1 port to 4.

The reset contact of CTR1 is designed to generate a count pulse to automatically return the count contact of A to O, and if R and h are connected and J is energized, A will return to the 0 position. It will be reset.

This counter is a general counter, but you can use a variety of counters without being particular about this square shape.

The counting coil h of this counter is connected in series with the b contact of the limit switch with work at the entrance and a relay contact that turns ON when the transfer sends the work, and the reset contact is connected in series with the limit switch with work at the entrance. ,
The a contact of the switch is connected.

Therefore, if there is a workpiece at the entrance, CTR1 is always reset, and only when there is no workpiece at the entrance, it is counted by one, corresponding to one transfer operation.

Furthermore, if the preset value and count value match, 1 and m
is energized and the workpiece dispensing completion relay CR5 is turned on.

The contact of CR5 is in the circuit of starting condition relay CR5, and if CR5 is turned ON, CR3 will not be turned ON after the ■ cycle is completed and the machine will stop.

At this point, the limit switch with work is turned on and CT
When R1 is reset and CR5 becomes OFF, CR4 becomes O.
Since it becomes N, the machine starts.

As described above, the present invention has the advantage that by running the machine when there is a workpiece in the machine and stopping it when there is no workpiece in the machine, it is possible to completely discharge the workpieces from the machine while preventing idle operation.

Additionally, machine setup becomes easier when processing many types of workpieces.

Although the embodiment of the present invention has been explained using an Intivepunto type transfer machine, it is not limited thereto.
It can be applied to all machines that transport one pitch of work in a cycle.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall view of a transfer machine, FIG. 2 is a simple explanatory diagram of its operation, and FIG. 3 shows a start/stop control circuit and a counter circuit. 1, n, III, IV, V, Vl, ■...Each single machine, J+ u2+ L12 + L12 + [
5+ 06 r u7”””Each work unit, tl, t
2. t3. t4. t5. t6. t7. t8...
Transfer device 1mi... Manipulator. A, B, C, D,, E... work in the machine,
■・・・Limit switch with inlet work, ■・・・
・・・・・・Departure full work limit switch, 1・・・・・・
Pre-process 1 - Transfer, 2... Transfer device, 3... Post-process 1 Transfer device, CTR
,...Work dispensing counter, h, bi...
...Count coil terminal, j, k...Reset contact, l, m...Count up contact. A: 1 count contact: Preset contact.

Claims (1)

[Claims] 1. Automated operating machines or single automated operating machines that have transfer devices that perform work such as machining or parts assembly can be connected by the transfer devices of each machine and can be started and stopped as a whole. In such transfer machines. Each machine is provided with a start/stop control circuit that enables starting/stopping of each machine even when the entire machine is in continuous operation, and the start/stop control circuit includes a counting circuit and a workpiece is transported to the entrance of each machine. It has a built-in limit switch that detects whether there is a workpiece in each machine, and starts and stops each machine by determining whether there is a workpiece in each machine.This prevents each machine from running idle, and also prevents unprocessed workpieces from entering the machine. A start/stop control circuit for a transfer machine, characterized in that no residue is left behind.