CS254576B1 - Apparatus for measuring the speed of weft movement from the decoiler - Google Patents

Abstract

The solution relates to a device for measuring the speed of movement of the weft during withdrawal from the unwinder, consisting of at least one light source and at least one light sensor, where the light sources and light sensors are connected to a power supply and evaluation circuit. The essence of the solution is that the light sources and light sensors are placed opposite each other at the inner circumference of the limiting ring, arranged between the unwinder and the pass nozzle. The device can be advantageously used in the construction of weaving machines.

Description

BACKGROUND OF THE INVENTION The present invention relates to a device for measuring the weft moving speed of an unwinder consisting of at least one light source and at least one light sensor, wherein both light sources and light sensors are connected to a power supply and evaluation circuit.

Devices for controlling the presence of a weft in a conductor are known, most often by wiping the light source, and the light sensor indicates this shade and sends an appropriate signal to the evaluation device, which notifies the operator and / or stops the machine in the event of no weft.

A disadvantage of the prior art is that known devices can only check the weft in its forward movement, and it is not possible to accurately determine the weft movement speed from this check. Another disadvantage is the necessity of constant maintenance of light sources and light sensors, which are constantly clogged in the dusty environment of the weaving mills.

This disadvantage of the prior art is largely eliminated by a device for measuring the speed of the weft moving during withdrawal from an unwinder consisting of at least one light source and at least one light sensor, wherein both light sources and light sensors are connected to a power supply and evaluation circuit. the light sources and the light sensors are located opposite each other at the inner circumference of the restrictor ring arranged between the unwinder and the picking nozzle, the axis of the restrictor ring being parallel to the axis of the unwinder. Advantageously, the sensing surface of the light sensor is part of the inner surface of the limiting ring and / or the radiating surface of the light source is part of the inner surface of the limiting ring and if the limiting ring is adjustablely fixed to the machine frame.

An advantage of the device for measuring the speed of the weft during the withdrawal from the unwinder according to the invention is that it is able to measure the continuous weft speed during the weft picking, thus enabling correction of the picking ratios already during the weft movement. Another advantage of this device is its self-cleaning ability, where the weft continually dusts the active surfaces of light sources and light sensors.

The invention will now be described in more detail with reference to the accompanying drawing, in which an exemplary embodiment of a device for measuring the speed of weft movement during retraction from an unwinder according to the invention is schematically illustrated.

The drawing shows the dispenser 2 / which is pivotally mounted in the machine frame 2 and on which is wound a given number of turns of the weft 2 · coaxially with an unwinder 2 ίθ between the unwinder 1 and a picking jet £ disposed containment ring 2 ^»in which the oppositely facing light the sensor 2 ^{and the} light source 7 such that the radiating surface of the light source 7 and the sensor surface of the light sensor 2 are part of the inner surface 2 of the limiting ring 2. The output of the light sensor 2 θθ is connected to the input light source 2 · The second output of the power supply and evaluation circuit 2 ίθ is connected to the input parameter controller (not shown). The limiting ring 2 θθ is connected to an adjustable bracket 10 fixed to the machine frame 2.

In operation of the device for measuring the speed of the weft during the withdrawal from the unwinder according to the invention, the picking nozzle 4 starts to withdraw the weft 2 ^{from the} unwinder 2 at the beginning of the picking. on the inner surface 2 of the limiting ring 2 ^and P 1 at each passage around the light source T 1 ^{, the} light source 7 shades towards the light sensor 2, which light sensor 2 indicates by pulse of the supply and evaluation circuit 9. the weft 2 on the unwinder 2 »ίθ it is clear that during the time elapsing between two light sensor pulses 2> a weft 2 will travel a path equal to the length of the unwinder 2 circumference. weft speed 2 · Simultaneously the weft 2 continually dusts the emitting surface of the light source T and the sensing surface of the light sensor 6 as it slides on the inner surface 8 of the limiting ring 2.

The invention can be advantageously used in the construction of weaving machines.

Claims (4)

A device for measuring the weft moving speed of an unwinder, comprising at least one light source and at least one light sensor, wherein both light sources and light sensors are connected to a power supply and evaluation circuit, characterized in that the light sources (7) and the light sensors (6) are positioned opposite each other at the inner circumference of the restrictor ring (5) disposed between the unwinder (1) and the picking nozzle (4), the axis of the restrictor ring (5) being parallel to the axis of the unwinder (1). Device according to claim 1, characterized in that the sensing surface of the light sensor (6) is part of the inner surface of the limiting ring (5). Device according to claim 1 or 2, characterized in that the radiating surface of the light source (7) is part of the inner surface of the limiting ring (5). Device according to Claims 1 to 3, characterized in that the limiting ring (5) is adjustablely fixed to the machine frame (2).