JPH0686018B2 - Control device for resistance welding machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a control device for a resistance welding machine, which controls energization to three or more resistance welding machines.

(Structure of the conventional example and its problems) In the resistance welding machine, the power supply equipment becomes large in order to instantly flow a large current, and when a plurality of welding machines are moved, the energization may overlap at the same time. Power supply equipment with multiple capacity is required.

Therefore, in the past, as shown in FIG.
_A control method was adopted in which the energization of the B-machine is waited by t _A until the position indicated by the dotted line, and the energization time of the B-machine is t _B after the energization time of the A-machine ends. In the above case, since the interlock is not performed depending on the timing of turning on, as shown in FIG. 2, the C machine may not be energized. That is, the activation signal A ₁ of the A aircraft causes the energization time t _A , and after the operation, the activation signal B ₁ was used to operate B.
The machine has the energization time t _B after the end of the energization time t _A , and then the C machine operates by the start signal C _1, but waits until the end of the energization time t _B , and then the second start signal of the A machine. Depending on the timing, due to interlocking with the energization time t _A due to A ₂ , the A machine may operate, and the C machine may not be energized until the energization time t _A ends again. There was a defect that the machine C could not be energized after performing the operation and waiting again.

(Object of the Invention) The present invention eliminates the above-mentioned conventional drawbacks, and stores and ranks the sequence of inputting the energization preparation signal (or activation signal) as an energization interlock of three or more resistance welding machines. Then, by outputting the energization commands in order, the machine A is energized, the machine B is then energized, and the machine C is ... Then the machine A is energized in that order.

(Structure of the Invention) In order to achieve this object, the present invention provides a data detection circuit that detects an energization preparation signal (or a start signal) of three or more resistance welding machines, and the order of data of the data detection circuit. A storage circuit that sequentially stores data, a data extraction circuit that extracts data in the order in which they are stored, a data output circuit that issues an energization start command based on the data, and a data selection that sequentially selects a storage circuit having upper data based on the data of the data extraction circuit. Circuit and a reset circuit for erasing the data of the memory circuit selected by the output of the data output circuit, three or more resistance welding machines are sequentially energized in the order of the energization preparation signal, and the energization is mutually heavy. It was designed so that it would not become.

(Description of Embodiments) One embodiment of the present invention will be described below with reference to FIGS. 3 and 4.

Input of energization preparation signal (or start signal) A, B, C, …………
Is input to the data detection circuit 1 having the order, and the storage circuit 2 sequentially stores the signals BCD-converted by the data detection circuit 1.
5 to 5, the stored data is sequentially fed in synchronization with the pulse generation circuit 6 that generates a one-shot pulse each time a signal is input. For example, when an input of A is input, the data of A is output by the pulse generation circuit 6. It is stored in the memory circuit 2, then B,
When C is simultaneously input, B is accepted and stored in the memory circuit 2 by the ranking, and at the same time, A of the memory circuit 2 is received.
Is stored in the storage circuit 3, then C is received and stored in the storage circuit 2. At the same time, the memory circuit 2
Data is transferred to the memory circuit 3 and data in the memory circuit 2 is transferred to the memory circuit 4.

The data input in this manner is used for the data selection circuit 7
Thus, the data fetch circuit 8 is instructed in order from the higher order memory circuit, and for example, the data fetch circuit 8 fetches data from the memory circuit 4 to which A is input, and the data output circuit 9 starts the energization of A. Is output. Next, at the same time as the energization ends, the data output circuit 9 resets the reset circuit.
A signal is output to 10, and the memory circuit 4 is reset. Next, the data (B signal) of the memory circuit 3 is output and the energization is started.

In this way, even if a signal is input during energization, it is stored in order and reset when it is completed, so that the one with the earliest input is always energized.

(Effects of the Invention) According to the present invention, since a plurality of welding machines of three or more in the related art are not energized and rationally performed, it is not necessary to increase the capacity of the power source equipment by a plurality of times, and one welding machine It is possible to use a large number of welding machines in the equipment, and the production can be improved without burdening the equipment.

[Brief description of drawings]

FIG. 1 is a timing diagram showing a conventional example of interlock, FIG. 2 is a timing diagram showing a conventional example of three or more interlocks, and FIG. 3 is a block diagram showing an embodiment of the present invention. FIG. 4 is a timing diagram of the embodiment of the present invention. 1 ... Data detection circuit, 2-5 ... Storage circuit, 6 ... Pulse generation circuit, 7 ... Data selection circuit, 8 ... Data extraction circuit, 9 ... Data output circuit, 10 ... Reset circuit.

Claims (1)

[Claims] 1. A data detection circuit for detecting energization preparation signals of three or more resistance welding machines, a storage circuit for sequentially storing the order of data of the data detection circuit, and taking out the data in the order stored by the storage circuit. A data fetching circuit, a data output circuit for issuing an energization start command according to the data of the data fetching circuit, a data selection circuit for sequentially selecting a memory circuit having higher order data by the data of the data fetching circuit, and an output of the data output circuit A resistance welding machine control device comprising a reset circuit for erasing the data of the memory circuit selected by the above, and sequentially energizing three or more resistance welding machines in the order of the energization preparation signal.