SU1673660A1 - Control device for feeding fabric to thermocutters on the weaving loom - Google Patents

Abstract

The invention relates to tissue-forming devices and can be used on textile machines. The purpose of the invention is to improve the accuracy of control. To do this, two comparators are introduced into the device, which control the level of voltage on thermal cutters and, in the event of its exceeding the set limits, disconnect the coupling placed between the drive and the fabric feed mechanism. 2 Il.

Description

The invention relates to tissue-forming devices and can be used on textile machines.

The purpose of the invention is to improve the accuracy of controls.

FIG. 1 shows a block diagram of the device: FIG. 2 - circuit diagram in principle.

The device contains a thermo-cutter control unit 1, a switching element 2 made on the basis of a thyristor, and a rectifier 5 rectifier 5 included in the block 1 and connected to the power rails in the control unit 1 and connected to the power buses thermo cutters, comparators 6 and 7. combined by inputs and connected with output of rectifier 5, inverter 9 connected between comparator 7 and input of logic element OR 8, the other input of which is connected with output of comparator 6, and output with control winding and an intermediate relay.

The device works as follows.

The voltage of the comparators 6 and 7 is preliminarily set, corresponding to the lower and upper limits of the allowable voltage on thermal cutters and the range of relative heating of the cutters for high-quality cutting and melting of the fabric edge. and 7. When the voltage on the cutters is less than or lower than the lower limit, which is observed, for example, as a result of a voltage drop in the supply network or the power supply unit fails, ommparators 6 and 7 are closed, inverter 9 is open, comparator 8 is open, normally open contacts of relay 10 are closed and voltage is applied to switching element 2 Relay 3 disconnects the friction clutch 4 of the fabric transport drive from the engine.

When the voltage across the thermal cutters is within acceptable limits, the comparator 6 is open, the comparator 7 is closed, the inverter 9 is open, the comparator 8 is closed, the relay 10 is not

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its contacts are open, the switching element 2 is closed, the normally closed contacts of the relay 3 hold the friction clutch in the position in which the drive is connected to the engine.

When the voltage on the thermal cutters rises above the permissible limit, which is observed, for example, during voltage fluctuations of the network and partition of one of the thermal cutters, a comparator 7 opens, causing the inverter 9 to close and the comparator 8 to open, turning on the relay 10. Relay contacts are normally open 10 closes, opening the switching element 2, the relay 3 is activated and the friction clutch 4 disconnects the motor.

Claims (1)

Claims of the invention A device for controlling the supply of fabric to thermal cutters on a loom, comprising a control unit for thermal cutters having a rectifier connected to the power supply tires of thermal cutters and an intermediate relay whose contact is included in the control circuit of the switching element connected in series with the control winding of the relay for activating the fabric transport drive coupling, characterized in that, in order to increase control accuracy, it additionally has a comparators, an inverter and an OR gate, and the rectifier output is connected to the inputs of the comparators, the output of one of which is connected through the inverter, and the output of the other is directly with the corresponding inputs of the OR gate, the output of which is connected to the control winding of the intermediate relay. h - / Fig. / U.2 / - ° EP eight CD FIG. 2