CS272964B1 - Pickup of weft threadrange especially for jet weaving looms - Google Patents

Abstract

A pick-up device of a weft thread (6) at its final stage of introduction into the shed of a loom, particularly for jet looms, comprises a transmitter (2) and a receiver (3) of electromagnetic heat, the optical axis (14) of which is transversely to the track of the introduced weft thread (6) and is situated at a distance of at most twenty times the recounted diameter of the weft thread (6) from a plane passing through beat-up parts (15) of adjacent dents (7) of the beat-up reed (4). An arrangement is provided for indicating safely the presence of a weft thread (6) fully introduced into the shed of a loom even in case the loom is operating in dusty surroundings, which arrangement is simultaneously adjustable for different widths of the fabric.

Description

The object of the invention is a weft yarn range sensor, in particular for jet weaving machines with weft yarn clogging through a carrier medium through an insertion channel formed by shaped reed beams comprising a coaxially arranged orifice of the emitter and receiver of electromagnetic radiation arranged between the reed beams. oriented transversely to the path of the inserted weft yarn and in parallel with the bunching portions of adjacent shaped reed bunches.

Known weft yarn range sensors for jet weaving machines with air media insertion using the optoelectronic principle of weft yarn detection in the insertion channel space are bulky and require a punching beam of appropriate length when the fabric width is changed, thereby allowing the range sensor to be mounted between the range. fabrics and weft threads. X is required to shorten or extend the bumper according to the width of the fabric. Other known optoelectronic sensors operate on the principle of reflecting emitted electromagnetic radiation from the weft yarn and employ optics. They are located on the weaving loom of the weaving machine and partially affect the air medium path, causing air turbulence and underdoses with very fine weft materials. Furthermore, the known optoelectronic sensor with the sensing elements positioned opposite each other is composed of two pieces, which makes it difficult to mount on a weaving machine and problems with fixing a pair of connection cables. Another known optoelectronic transducer has the same shape as a reed beam, but is substantially wider than the spacing between the reeds, and light guides are used to introduce electromagnetic radiation into the detection area. The emitter and receiver are placed in the upper and lower brackets of the reed beam. The sensor does not allow the weaving width to be changed without adjusting the length of the beam or changing it.

A common disadvantage of the known weft yarn sensors is, in particular, their improper arrangement, which causes a not quite reliable weft control, but in particular in the dusty environment of the tissue and in the weaving of the dusty fabrics. Another disadvantage is their manufacturing, technological and assembly demands. The disadvantage is above all the necessity of the working adjustment of the punching beam, or its replacement when changing the width of the fabric.

These drawbacks and drawbacks are overcome by the weft yarn range sensor, in particular for jet weaving machines with weft yarn clogging through the carrier medium by an inlet channel formed by shaped reed beams comprising a coaxially arranged orifice of the emitter and the receiver of electromagnetic radiation, the axis is oriented transversely to the path of the inserted weft yarn and in parallel with the knocking portions of adjacent shaped reed beams, whose essence is that the optical axis of the emitter and receiver of the electromagnetic radiation is max. recalculable diameter of clogged weft yarn.

It is advantageous if the emitter and receiver of the electromagnetic radiation are provided in a sensing part of the flat-shape sensor body located between the reed beams, with a recess whose shape corresponds to the insertion profile of the reed beams and into which the emitter and receiver emit, the support body of the sensor body is mounted on the bidlen of the weaving machine.

Furthermore, it is advantageous if the sensing part is detachably connected to the support part of the sensor body.

The main advantage of the weft yarn range sensor according to the invention is its expedient arrangement ensuring reliable weft yarn range detection even in the dusty environment of the weaving mills and in the weaving of the dusty fabrics. Another advantage is the reduction of production, technological, operational and assembly demands. The sensor can be easily mounted on the weaving machine according to the width of the fabric without adjusting or replacing the punch.

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CS 272 964 Bl

Examples of embodiments of the invention are shown in the accompanying drawings. 1 is a cross-sectional view of a portion of the insertion channel and its placement on the weave of the weaving machine; 2 is an elevational view of the weft yarn range sensor in one embodiment of FIG. 1, FIG. 3 is a plan view of the sensor of FIG. 2, FIG. 4 is a front view of a weft yarn range sensor in a second exemplary embodiment, FIG. 5 is a plan view of the sensor of FIG. 4, FIG. 6 is a front view of a weft yarn range sensor in a third exemplary embodiment, and FIG. 7 is a plan view of the third exemplary embodiment of the sensor of FIG. 6th

In the weaving machine (not shown), the bead 5 performs a reciprocating pivoting movement from the insertion position; 1 with solid lines, in the direction 9 into the stroke position, FIG. 1 in dotted lines. A groove 16 is arranged in the groove 16, the shaped reeds 7 having recesses 8, which in the reed system 7 form an insertion channel for inserting the weft yarn 6 into the open alive, consisting of a set of upper and lower warp threads 21 and 22, from a main nozzle and blower nozzles (not shown) mounted on the bidlen 5 longitudinally adjustable in the groove 20. The weft yarn detector comprises a coaxially arranged orifice of the emitter 2 and the electromagnetic radiation receiver 3, for example from the infrared region. 4, their optical axis 14 being oriented transversely to the draining of the inserted weft yarn 6 and parallel to the knock-in parts 15 of the adjacent shaped reed 7 of the knocker 4. From the functional radius of detecting the range of the inserted weft yarn 6, it is important that the optical axis 14 receiver 3 electromagnetic The distance of the radiation from the plane interlaced by the knocking parts 15 of the adjacent cane 7 of the spoke 4 is at most twenty times the calculated diameter of the inserted weft yarn

The electromagnetic radiation transmitter 2 and receiver 3 are preferably provided in the sensor portion 11 of the sensor body 11. The sensing portion 11 is of flat shape and is located between the reels 7 of the punching beam 4. It has a recess 13, the shape of which corresponds to the punching profile of the shaped reeds 7 of the beam 4, ie. in particular with their recesses 8. The emitter 2 and the receiver 3 of the electromagnetic radiation open into the recess 13, in which case the support part 19 of the sensor body 1 is fixed to the biden 5 of the weaving machine. This fastening of the sensor body 11 during weaving allows a partial relative movement of its sensing part 11 and the adjacent shaped cane 7, thereby disrupting the deposition of textile dust which is blown off by the air flow. In terms of manufacturing and assembly, it is advantageous if the sensor portion 11 is detachably connected to the support portion 19 of the sensor body 19, for example with countersunk screws (not shown). The mountings of the weft yarn arrival sensor carrier portion 19 on the baffle 5 are shown by way of example in the accompanying drawings. In the exemplary embodiment of FIG. 1, 2, 3, the support portion 19 of the sensor body 1 has a fastening protrusion 12, which, together with the punch 4, is fastened to the groove 5 in the groove 16. In the second embodiment of FIG. 4 and 5, the carrier portion 19 of the sensor body 1 has a groove 18 for fastening to the rear of the perch 5 by screws. In the third embodiment of FIG. 6 and 7, the sensor body support portion 19 has a guide protrusion 23 for receiving in the groove 20 for the blower nozzles 10. In this embodiment, the sensor body portion 11 of the sensor body 1 is inserted between the shaped reeds 7 of the spoke 4 at the front. Each support body 19 of the sensor body 11 has an opening 17 for mounting a connector (not shown) for connecting the sensor to the electrical evaluation circuits of the weaving machine (not shown).

During weaving, the bidlen 5 rhythmically moves from the picking up to the punching position and to sleep, in each turn of the weaving machine. In the insertion position, the weft yarn 6 is inserted into the insertion channel. As the weft yarn moves between the mouth of the emitter Z and the electromagnetic radiation receiver 3, which occurs either when it is clogged or when the bidlen 5 is moved into the stroke position, the intensity of the electromagnetic radiation changes, creating an electrical pulse. on the looms of the weaving machine, it allows further operation of the machine. If this pulse is missing, the evaluating circuits stop the weaving machine for the absence of the weft yarn 6, i.e. the weft yarn. do not fly.

Claims (4)

OBJECT OF THE INVENTION A Q-thread detector sensor, in particular for jet weaving machines, with the insertion of a weft yarn by a carrier medium through an insertion channel formed by shaped thirds of a punching beam, comprising a coaxially arranged orifice of the emitter and the electromagnetic radiation receiver. to the path of the inserted weft yarn and in parallel with the knock-in parts of the prickly shaped reed beams, characterized in that the optical axis (14) of the mouth of the emitter (2) and the electromagnetic radiation receiver (3) is from the plane intersected by the pricked parts (15) 7) a hammer (4) spaced at most twenty times the countable diameter of the inserted weft yarn (6). 2. The sensor according to claim 1, characterized in that the emitter (2) and the receiver (3) of the electromagnetic radiation are arranged on the sensing part (11) of the sensor body (1) in a flat shape, located between the reeds (7). with a recess (13), the shape of which corresponds to the insertion profile of the shaped cane (7) of the striker (4), into which the emitter (2) and the receiver (3) of the electromagnetic radiation are discharged, it is mounted on the bidlen (5) of the weaving machine. 3. The sensor according to claim 2, characterized in that the sensor part (11) is connected in a detachable manner by a support part (19) of the sensor body (1).