CS232388B1 - Weaving machine stopper - Google Patents

Abstract

The invention relates to a warp stop of a weaving machine, equipped with a warp thread breakage sensor, comprising a lamella with a warp f bar and a control circuit of the weaving machine. ( The essence of the invention lies in the fact that the warp thread breakage sensor is connected to a transmitter, which is connected to a receiver, while the output of the receiver is connected to the input of a galvanic separation, the output of which is connected to the input of the control circuit of the weaving machine. The invention can be advantageously used in the construction of textile, especially weaving machines.

Description

The present invention relates to a warp stop of a weaving machine provided with a warp yarn break sensor.

In current weaving machines, when the warp yarn breaks, the warp yarn lamella falls onto the warp bar to which the tension is applied. The dropped lamella shorts the warp voltage and the signal thus generated is applied directly to the weaving machine control circuit, which stops the machine, for example by an electromagnetic brake.

The disadvantages of the present state are that the means used to treat the warp threads together with the air humidity necessary for the proper operation of the weaving machine, form a layer of sizing with insulating effects on the contact bars. Due to low-voltage standards, the layer of sizing is a considerable resistance and its penetration often occurs only after several slats of the lamella on the warp bar or it may not break through at all. In practice, this implies the need to clean contact surfaces very often or to use a higher voltage than permitted by standards. The function of the whole device is not reliable, it is often characterized by a considerable delay of the rupture signal and an increase in reliability can be achieved only at the cost of very complex devices or at the expense of a considerable delay of the rupture signal.

232 388

This drawback is largely eliminated by the warp stop of the weaving machine according to the invention, comprising a warp thread break sensor comprising a warp strip lamella and a weaving machine control circuit, which is based on the fact that the warp thread breaker sensor is connected to a transmitter connected to the warp. a receiver, the output of the receiver being connected to the input of the galvanic isolation circuit, the output of which is connected to the input of the weaving machine control circuit.

The advantages of the warp stop of the weaving machine according to the invention are that the transmitter diagnoses the pore change even when the transition resistance between the warp yarn break sensor contacts is relatively large. Thus, the warp stop of the weaving machine according to the invention has a reliable function even when the warp bar is contaminated with a layer of sizing at low cost for the whole device and at the application of safe voltages corresponding to Czechoslovak and international standards. Furthermore, the machine is characterized by a long service life, low maintenance requirements and by the fact that it can be used without any major modifications to previously produced weaving machines. Another advantage is its compatibility with various electrical systems such as CMOS, DTL, TTL and higher integration.

The invention is described in more detail with reference to the accompanying drawing, in which an exemplary embodiment of a warp stop of a weaving machine is shown.

The warp yarn breaker 6 is connected to the output of the transmitter 2. The transmitter 2 is further connected to a receiver 3, the output of which is connected to the input of the galvanic isolation circuit 4, the output of which is applied to the control circuit of the weaving machine.

In an exemplary embodiment, the warp yarn break sensor 1 is formed in a known, not shown manner, by a lamella

232 388 warp threads and warp bar. The transmitter 2 is designed as an oscillating reason, while the receiver 2, a Schmitt flip-flop with a transmitter frequency detection. The galvanic separation circuit 4 is then formed as an optoelement consisting of a light-emitting diode circuit controlling the operation of the phototransistor circuit.

In the warp yarn breakage operation, the warp yarn strip falls onto the warp bar and the resistance to which the transmitter 2 transmits decreases from an infinite value to the transition resistance value between the warp yarn lamella and the warp bar. Reducing the resistance to the transmitter output and thereby dropping the transmitter from oscillations is evaluated by the receiver whose output signal is processed by the galvanic isolation circuit 4 and the information contained therein is passed to the weaving machine control circuit input to stop the machine and signal a fault. Reliable operation of the device is ensured if the internal transient resistance of the sensor, ie the transient resistance between the warp thread dropped and the warp bar, does not exceed 10 kilo ohms.

The device can be advantageously used in textile, in particular weaving machines.

Claims (2)

SUBJECT OF THE INVENTION A warp stop of a weaving machine comprising a warp yarn break sensor comprising a warp slat and a weaving machine control circuit, characterized in that the warp yarn break sensor (i) is connected to a transmitter (2) connected to a receiver (1). 3), wherein the output of the receiver (3) is connected to the input of the galvanic isolation circuit (4), the output of which is connected to the input of the machine control circuit. 2. A warp stop according to claim 1, characterized in that the internal transient resistance of the sensor (i) is less than 10 kilo ohms.