CS233453B1 - Weft yarn sensor - Google Patents

Abstract

The invention solves the sensing of the weft thread in the controlled space of pneumatic jet textile machines. The invention relates to the inlet stop for pneumatic jet machines, unorthodoxly, with weft clogging by the rocking movement of a lamella ridge formed by a system of lamellas. The essence of the invention is the placement of sensing elements in the control lamella, which are used to sense the range of the weft face into the controlled space.

Description

BACKGROUND OF THE INVENTION The present invention relates to a weft yarn detector of a photoelectric range stopper for non-orthodox weaving machines with weft insertion by swinging a lamella ridge formed by a lamella assembly, where it addresses sensing weft range to a controlled area of an air channel serving for weft thread.

The prior art weft yarn range sensor includes a radiation transmitter with an even number of radiation receivers, utilizing the screening of one receiver as a disturbance of the bridge wiring condition, provided that the other receiver remains unchanged. A similar weft yarn range sensor comprises a plurality of radiation transmitters arranged to transmit radiation, each transmitter delivering radiation for an even number of receivers of at least two placed in a circular shape.

These range sensors do not include the possibility that when the weft reaches, it oscillates in the controlled area, thereby obscuring an even number of radiation receivers involved in the bridge circuit and causing a dysfunction. A similar situation occurs when weaving two or more wefts per stroke. The described transducer uses transversal motion components during weft stopping and compares these with the exact frequency set by the electronic circuit, without taking into account machine start-up and speed fluctuations, so a dysfunction occurs in these conditions. Also, this range sensor must take into account the arrival and departure of the weft yarn from the circular controlled area. Another known range sensor operating to change the cepacity by passing the weft yarn shows a dysfunction in weaving very fine weft yarns.

The aforementioned drawbacks are overcome by a weft yarn range sensor according to the invention, comprising a control lamella in a shape identical to the slats forming an air channel, comprising an electromagnetic radiation emitter and a nth number of radiation receivers disposed on the perimeter channel at the maximum emitting angle of the transmitter. the receiver supplies a signal from the weft yarn, which is processed by the electronic circuit.

By positioning the nth number of radiation receivers along the perimeter of the draining channel into the angular section of one electromagnetic radiation transmitter, the weft yarn head is sensed regardless of the transverse weft yarn components that arise when weft is arrested, and the sensor emits an electrical signal .

The attached drawing shows an example of an embodiment of a weft yarn range sensor, in which an electromagnetic radiation transmitter 1 is located in the control lamella, which covers the entire control space 6 over the weft front transition 6, generating an electrical pulse impedance adapted to the electronic circuit g. for dirt processing.

Claims (1)

OBJECT OF THE INVENTION A weft yarn detector comprising an electromagnetic radiation transmitter, characterized in that 1 to n electromagnetic radiation receivers (2) located on the perimeter of the bed channel cover the entire control area (4) for weft front transition (6), the electronic circuit (5) being part.