SU478901A1 - Thread tension regulator - Google Patents

Description

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The invention relates to control systems used in the textile industry and is intended to stabilize the tension of threads, for example, on weaving machines.

Known tension regulators for yarns include a tension sensor, a stepper motor, a control unit, electronic keys, a signal generator, angular displacement sensors, and a setpoint adjuster.

However, the intra-cycle regulation of the tension of the threads in the known regulators cannot be carried out with sufficient accuracy due to the inertia of the rock, during the movement of which the tension sensor is triggered. In addition, the controllers have a complex structure, due to the large number of elements.

In order to improve the design and increase the speed in the controller, the tension sensor uses a frequency sensor-adder of noise signals connected to the comparison node through an amplifier and a converter.

FIG. 1 shows a yarn tension sensor; in fig. Figure 2 shows a block diagram of a tension control system for weaving machine threads.

The sensor-adder of the tension control system for the filaments (see Fig. 1) contains elastic

the element (wire) 1, which the threads of the warp 2 are touching during its movement; bracket 3, for attaching the sensor to the machine base 4; electromagnetic system with coil 5 and

core 6, in which there is emf when the tension of the tensioned wire 1 in the process of movement of the threads 2 of the base.

The thread tension regulator (see Fig. 2) consists of a sensor-adder 7 with an elastic element 1 connected through an amplifier 8, an AC-to-constant converter 9, a comparison element 10, an analog-to-digit converter 11 and a switch 12 to a step switch engine 13 with gear 14 serving for

driving 15. The signal corresponding to the nominal tension from the setpoint adjuster 16 is fed to the reference element 10. The device operates as follows.

The noise signal arising in the elastic element 1 when the tension of the thread changes, leads to the excitation of an electric signal in the winding of the accumulator 7. This signal is fed to the amplifier 8 and then to the converter 9, where it is converted into a DC signal. The converted signal is fed to the element of comparison 10, where it is compared with the master signal coming from the setter of natia 16, which corresponds to the set natii of the warp threads.

Due to the friction of the threads on the elastic element of the sensor, for example (tensioned steel wire), a noise stationary random process occurs in the controller.

The tension adder of individual threads in this system instead of a magnetic or semiconductor summing device is an elastic element of the sensor (wire tension), which allows to sum the noise signals excited by the individual threads.

The analogue-digit device 11 converts the error signal into an equivalent sequence of pulses. The pulses are fed to the switch 12, which controls the stepper motor 13. Depending on the sign of the error signal, the stepper motor, rotating 16 through the gearbox 14, levels the tension of the filaments to a predetermined value.

The present invention may be used in the development of automatic weaving machines for in-loop adjustment of the tension of warp threads and other purposes.

Subject invention

A thread tension regulator, for example, bases for weaving machines, comprising a tension sensor, a comparison unit, a tension adjuster, an analog-to-digital converter, an amplifier, a switch and a stepping motor, characterized in that, in order to simplify the design and increase speed, The controller uses a frequency sensor-adder of noise signals as a tension sensor, which is connected to the reference node via an amplifier and a converter.

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