CS244352B1 - Yarn end drawing-in device - Google Patents

Abstract

The invention relates to a device for introducing a yarn end (17) to the delivery tube (12) of a spinning unit (1) of an open-end spinning machine by means of a driver (10) which is displaceable to and fro and which is equipped with an open guide (2) serving for guiding and tensioning the end piece (16) of the yarn in close proximity to the mouth (11) of the delivery tube (12), and with a supporting face (13) controlling the position of the end piece (16) of the yarn (3) during the movement of the driver (10). The device is characterised in that the supporting face (13) has a pneumatic holding device (8, 9, 15). In an especially advantageous embodiment, the line on the supporting face (13) opens out through some orifices (15) which are arranged next to one another in a row extending in the longitudinal direction in relation to the fixed position of the end length (16) of the yarn (3). <IMAGE>

Description

BACKGROUND OF THE INVENTION The present invention relates to a device for guiding the yarn end to the discharge tube of an open-end spinning machine spinning unit by means of a reversible withdrawal carrier provided with an open guide for guiding and tensioning the yarn end length. while the carrier is moving.

It is known that due to the negative pressure in the spinning rotor, there is a slight air flow inside the spinning unit within the spinning tube. so that it is kept taut. Once the mouth of the discharge tube reaches the end of the yarn is immediately drawn in, and the carrier may start ^p bending from ^P., et # ^when a ^{P including} m ^p oh ^Yb in una ^{e p} e is released, end length of the yarn and the yarn end sinks deeper into the drain pipe. Practically, however, is the moment of initiating the retraction. the yarn end is pre-set according to when it is expected to grip the yarn end with the air flowing in the discharge tube. There may vzrákat Oruç ^{p hy.} Bun is: oncová ^dé lk: ^pa of released too early, so shrugs and airflow Pobre it is not enough, or too late, and the yarn end runs away from the air stream.

The invention is to create such a measure to change ^í Nene introduction device ^for unwinding the NAV ter ^{é é TK} Oneco yarn ^P to ^U stí discharge tube at a position sufficient to grip it securely airflow.

This object is achieved according to the invention in that the support surface has a pneumatic yarn retainer.

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More specifically, the retainer consists of a pneumatic line which terminates on a support plate and is permanently or optionally connectable to a vacuum source.

This makes it possible to more accurately determine the moment of retraction of the yarn while holding the end length of the yarn in the tensioned state.

It is advantageous according to the invention if the pneumatic line results in a plurality of holes on the support surface, which are arranged side-by-side in a row extending in the longitudinal direction to a determined position of the end length of the yarn.

It is furthermore advantageous according to the invention if the support surface has provided guiding parts symmetrically to the holding yarn. These guide parts guide the end length of the yarn precisely to a predetermined position.

An exemplary embodiment of the device according to the invention is shown in the attached drawing, in which the figures show: Fig. 1 - a side sectional view of the device according to the invention; Fig. 2 - a section through the carrier and pneumatic retainer along line A - A in Fig. 1.

A conventional open-end spinning machine comprises in a row a side-by-side spinning units 1 from which the yarn exits through the discharge tube 12. During normal operation, the yarn is guided through an axially-spindle guide rod ^{with a} guide groove 6, pulled out of the take-off rollers (not shown). a take-up reel (not shown).

In the event of a yarn breakage, the end or, by means of scissors 18, a new yarn end 17 returned from the winding reel is generally used. This end has to be introduced into the spinning rotor of the spinning unit 1, where it is connected to the filaments to be fed and the yarn can again be normally withdrawn and wound.

244 352

To this end, the end 17 of the yarn 3 is guided to. mouth 11 of the discharge pipe 12 where it is gripped by the air flow directed into the spinning unit 1, A clogged on the spinning rotor # The unbonded fibers is fed to then end 17 of the yarn ³ prices reverse rotation of the reel spool, or fluidized interaction of specific predetermined pulling or releasing created stock loops additionally killer synchronic means, yarn.

To guide the end 17 of the yarn 3 to the discharge tube 12, in the case of the invention a carrier 10 is provided, which is arranged at the free end of the pivot lever 2 »mounted on the drive shaft 6 as a sickle-shaped part. on its outer arcuate side, a support surface 13 'for the yarn end portion 16'. You ^at the surface 13 of the U is £ ^c T ^y Rm ^and holes 15 »^ arranged APPLICABLE. ^d the le itself in RACL extending in the longitudinal direction to the intended position of the end 16 of the length of the yarn 3, a pneumatic line, which is connected to a vacuum source not shown. In addition to the aforementioned apertures 15, this pneumatic duct extends from the tubular member - and the flexible suction tube 8 attached thereto, interconnects the apertures 12 with a vacuum source, and a practically pneumatic yarn retainer. openings 15 has - Depth sestánástavkterá 'forming surface 13 symmetrical guide portion 14, 21 (see FIG. 2) ® ^Chi nNOS ^t Glare ^and Zen ^{i K} - guided ^{I to} once 17 pWze ^{3 to} odvádětrubce 12 of the spinning unit 1 according to the invention FOLLOWING the yarn 20 unwound from the take-up reel is generally set by the suction nozzle to a position located in the plane for transferring the yarn to the normal running position on the machine # Now the lever 2 pivots towards the machine # open guide 2 crosses the path of the yarn unwound from the bobbin # During pull-out movement of the carrier catches open guide the yarn 20 and carry it with it # Yarn 20 gradually wraps around the support surface

As soon as the yarn comes under the suction effect of the pneumatic retainer holes 15, an impulse is given to separate the outermost end 19 of the yarn 20.

244 3S2

Since the new end length 16 of the yarn J is further effectively retained to the support plate 13 by the pneumatic retainer, the newly formed end 17 of the yarn J cannot change its position arbitrarily to run out of the airflow in the discharge tube 12. end 17 of the yarn J closer to ^U St ⁱ 11 a ^d a ^c d ^e r ⁱ wind ^BKY £ 1 is about ^to am ^fo you VTA ^TOWING dovnHř · Now may be a pneumatic retainer switched off and the driver 10, respectively · ^levers and 1 ^No. not for a funeral ^yb ovata. cr ^E t. Here, it introduces the yarn end length J and the end 17 is retracted further into the discharge tube 12.

However, the action of the pneumatic retainer may be permanent. In this case, its suction effect is adapted to the suction effect of the discharge pipe 12 so that the end length 16 of the yarn J is detached from the pneumatic retainer whenever the end n of the yarn J is safely below the suction effect of the discharge pipe 12 and its correct position can no longer be affected by anything else.

Thus, the accuracy of the adjustment of the moment of the start of the backward movement of the carrier 10 does not matter so much in the device according to the invention, but the device does not lose its reliability.

Claims (4)

Apparatus for guiding the yarn end to the tube of a spinning unit of an open-end spinning machine by means of a spindle of an extensible carrier provided with an open guide serving to guide and tension the end length of the yarn in close proximity to the outlet tube mouth; in that the pneumatic retainer supports the yarn support surface (13). reports 2o characterized in that: Apparatus according to claim 1, ⁱⁿ the pozůst ^{a r} a ^p neumatic ^KEH about večlení, are exercised ^{on the} support surface (13), β which is permanently or selectively connectable to a vacuum source. ^y retainer in the US ^and U is on 3o Apparatus according to claim 2, characterized in that the guide terminates on the support surface (13) as a plurality of openings (15) arranged side by side in a row extending longitudinally to a predetermined position of the end length (16) of the yarn (3) · 4 # Apparatus according to claim 1, characterized in that the support surface (13) has guiding parts (14, 21) arranged symmetrically to the yarn holder.