FR2493352A1 - IMPROVEMENT IN CURSORS FOR SPINNING RINGS - Google Patents

Abstract

Travellers for spinning rings which guide a yarn (1) between the underside of the traveller (4) and the topside of the running track (5) of the ring. According to the invention, the traveller has a warped or skew shape, and its centre line extends, for example, essentially along the arc of a helix, which means that the lower ends (12) of the traveller are offset on both sides relative to a plane passing through the middle part (13) of the traveller. On this traveller, a greater yarn freedom between the traveller and the running track is obtained at high spindle rotation speeds.

Description

 Per @@@@@ training on the sliders for spinning channels.

 The invention relates to the textile industry and more particularly to ring spinning machines as well as similar canvas machines as to webs & twists.

 A ring spinning machine consists of a plurality of identical work stations arranged side by side, each essentially comprising a spindle driven in rotation by any known means. Said pin serves as a support for a tube on which is wound the wire coming out of a pair of delivery rollers, guided by an eyelet and wound by the movement of a sliding cursor on an annular track carried by a ring concentric with the pin0 fixed or itself rotated! the wire passing between the internal surface of the cursor and the external surface of the track.

 However, it turns out that when the system works at high speed, the cursor may tend to fold.

 ct which decreases the space of passage, of the wire which happens to be sheared between the cursor and the edge of the track and to break. This defect is all the more accentuated as the cursor is lower, that is to say that the passage of the wire is narrower. However, to turn at high speed, it is essential to use a cursor as low as possible to bring the center of traction of the wire closer to the center of friction of the cursor on its track.

 An improvement is obtained by giving the cursor a round or half-round section, the rounding facing the track, but this does not entirely resolve the difficulty.

 The invention aims to further improve the situation. It relates to a slider for spinning rings characterized in that it has a helical shape whose pitch is opposite to that of the twist of the wound thread.

 The description which follows, as well as the appended figures, will better understand the interest of the invention.

 The ficur @ 1 repr @@ entes the orga @ es carenti @@@ of a work station of a continuous spinning.

 FIG. 2 is a section on a larger scale of the area C of FIG. 1.

FIGS. 3A and 3B represent the positions taken by a conventional cursor during the operation of the machine.
FIGS. 4A and 4B are similar views, with a cursor according to the invention, and illustrate the improvement made by the invention.

 FIGS. 5A and SB are plan views of the cursor according to the invention.

 As is known, the wire 1 (FIG. 1) leaving the delivery cylinders 2 crosses the eyelet 3, passes through the space between the cursor 4 and the track 5 of the ring 6 on which it slides under the tensile force of the wire, then winds on the spool 7-surrounding the spindle 8 driven in rotation by the belt 9 via the nut 10.

 As is more visible in FIG. 2, the cursor 4 is applied by centrifugal force to the zone 11 of the track 5 of the ring 6 and the wire 1 passes in the space thus formed between the cursor 4 and the track 5.

 By observing with the strobe the operation of a spinning station equipped with conventional cursors, it is visible, as shown in Figure 3, that the plane of the cursor 4 which, at very low speeds, merges with a radial plane of the ring 6 (Figure 3A) tilts relative to the latter (Figure 3B) when the speed increases.

 Because of this lying position "of the cursor, the passage of the wire between the cursor and the track is even narrower, which increases the risk of shearing of the wire.

 A conventional cursor, such as that shown in FIGS. 2 and 3. is "flat" or "planar", that is to say that the two "ends 12 of the cursor folded inwards are in the same plane as the central part 13 of the cursor.

 According to the invention, instead of making a "plane" cursor, a "left or" warped "cursor is produced.

A part is used, for example, the center line of which is substantially a helical arc. It can be seen, in FIGS. 4 and 5, that the two ends 12 of the cursor are not found pa8 in the median plane passing through the central part 13 of the cursor but are, on the contrary, offset on either side of this plane.

 During operation, the system configuration becomes that of FIGS. 4 and 5. At the start of the spinning process, the cursor 4 is inclined in the opposite direction to the direction of movement of the cursor 4 on its track 5 (FIGS. 4A, 5A).

As the speed of rotation of spindle 8 increases.

the cursor, under the pulling force of the wire, tends to move in the direction of movement of said cursor 4 and therefore to approach the vertical position (FIGS. 4B, 5B), thus increasing the passage space of the wire 1 between the cursor 4 and its track S. Thus, the wire no longer risks being sheared between the internal face of the cursor 4 and the edge of the track.

 This construction therefore makes it possible to work with very low sliders, allowing high speeds while substantially reducing the number of breaks.

 Obviously, the pitch of the propeller must be opposite to that of the twist of the wound wire, otherwise the original inclination of the cursor 4 would increase with the increase in speed and the result would be much worse than with a plane cursor. This therefore requires a change of cursor, when it is necessary to change the direction of twist of the wire. Copendant. most of the threads have the twist X. which rcnd oc'raior: cllc the need to change the runner.

au @@ e @@@@. the decrease in the number of breakages and the increase in speed resulting from the use of a left cursor amply justifies this subjection.

 Of course, the invention is in no way limited to the embodiment described and represents, it is likely to have numerous variants accessible to those skilled in the art, depending on the applications envisaged and without departing from the scope of the invention. 'invention.

Claims (3)

K @@@@ DICATIONS  1. Slider for spinning ring, characterized here. what it has a left shape.  2. Slider according to claim 1. characterized in that its star line has substantially the force of a propeller are.  3. Slider according to claim 2. characterized in that the pitch of the @elice is opposite to that of the twist of the product wire.