SU279509A1 - - Google Patents

Description

DEVICE FOR SWITCHING DEFINITION THREAD ON THE MOBILE WELDING MACHINE WITH REMAINING OUTSIDE THE ZEVA OF BOBIN

A device is known for rewinding a weaving MITI on a weaving loom with a reel remaining outside the throat, containing an intermediate drive made in the form of a drum mounted on a shaft with a conical expansion at one of its ends, a thread guide and a mechanism for stopping a thread guide with excessive accumulation of the weft thread on the drum.

In this device, the drum is made rotatable, as a result of which, after the weft is inserted into the throat, the weft thread continues to unwind and loosen, which can lead to the formation of a loop.

In the proposed device, one of the parts, the shaft of the drum is made hollow, and on the other part of the shaft there is a device for protecting the drum from rotation, which is made in the form of an eccentric load located in it, and the yarn guide is made in the form of a conical funnel with a ramp located above the conical expansion of the drum mounted coaxially with the drum at the end of the shaft part having an inclined groove whose surface is an extension of the conical surface of the funnel.

repleny on the end of the cylindrical part of the drum.

The drum has a smooth light reflecting surface.

The stop mechanism of the yarn guide with excessive accumulation of weft yarn on the drum contains a light source directed to the smooth reflecting surface of the drum and a photocell placed in the path of the reflected beam, the pulses of which control the magnetic friction device mounted on the hollow part of the shaft.

The thread guide receives motion from an electric motor driven by photocell pulses.

FIG. 1 shows a device for rewinding a weft yarn on a loom; in fig. 2 is a cross-section of a drum with an eccentrically located load in it.

The device for rewinding the weft yarn 1 is mounted on the brace 2 fixed on the bed of the weaving machine between the reel 5 that is left outside the throat and the shuttle 4 pusher mechanism 4. The bracket 2 is equipped with a ball bearing 5, in which the shaft 6 is located. At the end of this part of the shaft is set loose

is driven from the electric motor 10. The pulley 8 is equipped with an end plate //, in the immediate vicinity of which on the same hollow shaft there is a disk 12 fixed to the key, carrying electromagnets 13, fed via brushes 14 from: generator 15 through switchgear 16 The disk // and the disk 12 are a magnetic friction device with which the shaft 6 is turned on and off.

The second part 17 of the shaft 6, serving as a continuation of the hollow part 7, is made splonlny. It is equipped with an intermediate storage weft yarn /, made in the form of a drum 18 with a conical expansion 19 on one of the ends. The drum 18 is mounted on the shaft 6 on the ball bearing 20 is stationary, as it is prevented from rotating along with the shaft 6 by the bores 21 permanent magnets 22 mounted on the sleeve 23 with the annular groove 24. The sleeve 23 is fixed on the bracket 2 at the end of the cylindrical part of the drum / five.

At the end of the hollow part 7 of the shaft 6 adjacent to the drum 18, there is a yarn guide, made in the form of a cone-shaped funnel 25 with an eye 26 located above the conical expansion 19 of the drum 18. In order to pass the rewindable thread / in the hollow part of the shaft 6, a grooved groove is made in front of the funnel 25 27, the surface of which is a continuation of the conical surface of the funnel. 25

On bracket 2, there is a source 28 of light from the mechanism for stopping the yarn guide with excessive accumulation of the weft yarn on the drum 18. The light source is directed to the polished, reflecting light surface of the bar: a: ban. A photocell 29 is separated from the light source 28 by the screen 30 on the path of the reflected beam. The pulses of the 2P photocell control the magnetic friction device 11-12, mounted on the zero part 7 of the shaft 6. The light source is connected by wires 31 to the generator 15.

At the end of the bracket 2, the braking device 33 of the thread 32 is controlled in the rhythm of the main shaft of the weaving machine with the help of a cam 32.

During the operation of the loom, the magnetic friction device 11-12, which is energized, is closed, as a result of which the shaft 6 and the thread guide 25 rotate at a constant number of revolutions. The weft thread 1 is inserted into the reels 3 through the peephole 34 and the brake device 35 into the hollow part 7 of the shaft 6, from which it extends through the inclined groove 27 of the latter, and passes through the eye 26 of the cone-shaped funnel 25 - the thread guide to the drum 18. Rotates around the drum, The yarn guide winds the thread / onto the tapered extension 19 of the drum 18. As the surface of the drum is polished, the turns of the weft 1 slide off the tapered expansion of the drum onto its cylindrical part, as a result several turns are assembled on it one after the other.

During the insertion of the weft yarn / into the shed 36, it passes through an annular head 24 and then

through the eye 37, whereby the balloon of the thread / is not formed in this region. Next, the thread passes through the brake assembly 33, which during the introduction of the weft thread is braked, through the thread tension regulator 38, is picked up by the shuttle 4 n and inserted into the jaw 36.

When excessive accumulation of weft yarn 1 on the drum 18, it overlaps the polished surface of the drum, as a result of which the beam coming from the source 28 of light does not reflect from the surface of the drum, the photocell 29 stops feeding impulses to the electromagnets 13 and the magnetic friction device 11-12 opens. In this way, the rotation of the shaft in and the yarn guide 25 mounted on it stops and the thread is refined / is no longer wound on the drum 18.

When, after one or several insertions of the weft yarn / into the shed 36 of the drum 18, several turns are wound up and the place of reflection of the light beam on the drum, it is again affected by the photocell 29, which includes electromagnets 13. This causes the magnetic friction device 11-12 to close. The shaft 6 and the thread guide 25 begin to rotate and wind on the weft yarn accumulator — drum 18 — from the reel 3 weft thread 1.

The drum 18 can also be fixed at all times, instead of using fixed

magnets 22, through an eccentric located in it a load 39 (see Fig. 3).

It is also possible to bring the yarn guide 25 into motion and stop it when there is an excessive accumulation of the weft thread / on the drum 18 not through the magnetic friction device 11-12, but directly from the electric motor 10, for which the current is applied to the latter through a switchgear 16 controlled by photocell pulses 29.

Subject invention

Claims (6)

1. A device for rewinding a weft yarn on a loom with a reel remaining outside the throat, containing an intermediate drive made in the form of a drum mounted on a shaft with a conical expansion on one of its ends, the yarn guide and the yarn guide stopping mechanism with excessive accumulation of the weft yarn on the drum, characterized in that it has a device for protecting the drum from rotation, and part of the shaft performed hollow. 2. The device according to claim 1, characterized in that the yarn guide is made in the form of a funnel with an eye for feeding the thread located above the conical expansion of the drum, installed la, having an inclined groove, which is a continuation of the cone-shaped surface of the funnel. 3. The device on on. 1-2, characterized in that the device for protecting the drum from rotation is made in the form of an eccentric weight located in the letter. 4. Device on PP. 1-3, characterized in that the drum has a smooth light reflecting surface. 5. Device on: P. 1, characterized in that the mechanism for stopping the yarn guide with excessive The accumulation of the weft yarn on the drum contains a light source, the rays of which are directed onto the surface of the drum, and a photocell placed in the path of the reflected beam, whose pulses control the magnetic friction iris arranged on the hollow shaft. 6. The device according to PP. I - 2, characterized in that the yarn guide receives movement from an electric motor controlled by photocell pulses. J l. 7 /; Oh lit 3 i