US3082796A - Threading and guiding means for the weft thread in shuttles with automatic ejection of the cop residue - Google Patents

Description

March 26, 1963 J. F SCHRODER 3,082,796 THREADING AND GUIDING MEANS FOR THE WEFT THREAD IN SHUTTLES WITH AUTOMATIC EJECTION OF THE COP RESIDUE Flled May 19, 1960 IN V EN TOR.

AT TORIVE Y5 Ta,ilt2,796 THREADENG AND GUEDENG MEANS FtBR THE vi EFT THREAD EN SHUTTLES WiTH AUTG- MATEC EEECTEUN E THE (CG? RESEDUE Iohann Friedrich Schriider, Reutlingen-Betzingen, Germany, assignor to C. C. Egelhaaf, Konnnanditgesellschaft, Rentlingen, Germany Filed May 19, 196i), Ser. No. 39,222 Claims priority, application Germany 0st. 8, 1957 1 Claim. (Ci. l3i98) The present invention relates to threading and guiding means for weft thread in shuttles with automatic ejection of the cop residue.

This application is a continuation-in-part of my application Ser. No. 746,046, filed on July 1, 1958, and now abandoned.

Looms with automatic changing of the weft carriers are known in which the weft cop in the Shuttle is monitored by means of a sensing arrangement, and the remainder or residue of the weft on the cop is removed from the shuttle automatically by means of an ejector ar rangement before the insertion of a new cop. The feeler of the sensing arrangement yields when only a small remainder of weft is on the cop and, thereby sets the ejector means in operation. As a rule, this means consists of a hook which, when made operative by the sensing arrangement, enters into the shuttle at one end thereof and removes the remainder of weft located at the other end. in a known arrangement of this kind, the weft thread is introduced into the shuttles by means of a special threading arrangement, through a weft thread channel which can be opened and closed as required, and is held resiliently in either position. With such means, however, there is a danger that on the placing of the cop, the thread will not come immediately through the then opened threading means into the correct position. In such a case, the threading means will be closed positively with the next throw of the shuttle, the weft thread remaining in the wrong position thus resulting in irregular weaving. The weaver will, therefore, be required to adjust the loom and re-thread.

It is an object of the invention to provide a weft-thread threading and guiding means for such loom shuttles in which this drawback is obviated. Accordingly, means are provided which consists of a spring pawl continuously bridging the weft thread channel, whereby the weft thread on introduction of the cop slides off downwardly by itself so that it reaches below the pawl via its free end which in its turn, on entry of the ejector hook through same, is pened and then returns automatically, springing again int its starting position. The pawl lies with its movable end in a lateral recess of the weft channel, so that the thread, after it is brought under it on introduction, is continuously guided in the channel. The pawl is advantageously arranged rotatably around a pin mounted in a recess of the shuttle wall in such manner that it can swing out around this pin on contact of the ejector hook with it, but by means of a torsion spring surrounding it, can be turned back again into this starting position on engagement of the ejector hook and can be held in this position. The torsion spring is easily exchangeable and can thus be adapted to the different stresses when weaving.

One embodiment of a weaving shuttle according to the invention is illustrated diagrammatically in the drawing, wherein:

FIG. 1 is a top-plan view of the shuttle device;

FIG. 2 is a side-elevational view of the shuttle device;

FIG. 3 is a section taken along line 33 of FIG. 1; and

FIG. 4 is a section taken along line 44 of FIG. 3.

Referring now to the drawing in detail, the shuttle body 1i) is made of two parts 11 and 12 assembled by means of 3,@8Z,7% Fatented Mar. 26, 19%.?)

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threaded portions 13 and 13a. The shuttle body is pro vided with a hollow portion 15, which for-ms a weft-cop chamber open at the periphery of the body, to an inner face of which are secured brush bristles 16 for holding a cop T8. The full cop is introduced into the shuttle in known manner and is positioned there as shown in FIG. 1. Extending from cop 13 is a weft thread 20, which is led through a peripherally open longitudinally extending channel 22 formed by spaced wall portions 24 and 26. Lo cated in a recess 28 of wall portion 26 is a pawl-support member 3%) secured by an Allen screw 31 to part ill of shuttle body it The pawl-support member 39 is provided with a rectangular opening 32, in which, a pawl 36 is pivotally mounted by means of a pin 34 passing through support 39. Pawl 36 is formed with a widened free end portion to prevent the weft thread from sliding out during the movement of the shuttle while in operation. During the drawing oil of the weft thread, loops easily form and these would get behind the pawls free end if it were not widened. The thread-guide pawl 36 extends across channel 22 into a lateral recess 38 in wall portion 24 and is normally held in that position by spring it one end 42 of which bears against face 44 of pawl-support member 36. The other end 46 of spring it) bears against a recessed edge 48 of pawl 36.

In operation the cop i8 is inserted into opening 15 between brush bristles l6, and weft thread 20 is passed over the convex outer surface of pawl 36 as shown in FIG. 3 by sequence representing arrows 5E}; The weft thread is thus positioned in the concave recess 52 of pawl 36, thereby preventing its vertical displacement during the operation of shuttle i l. The remnant of cop 18 is removed automatically, in known manner, by means of ejector hook 54, the ejector hook forcing in its travel pawl 36 in an arcuate path against the tension of spring 40. After ejector book 54 has passed pawl 36, for removal of the remnant of cop 18, in known manner, spring 40 returns pawl 36 to its original, normal position as shown in FIG. 4.

What I claim is:

In an automatic weft-cop-changing device for a loom, in combination, a support, a shuttle displaceable relatively to said support, and means including an ejection finger disposed on said support for the automatic discharge of remnants of a weft cop from said shuttle upon a displacement of the latter past said finger; said shuttle comprising an elongated shuttle body formed with a weft-cop cham ber open at the periphery of said body and a longitudinally extending channel open along said periphery and extending from said chamber toward one of the extremities of said body for paying out weft thread from a cop disposed in said chamber, a generally flattened thread-guide pawl extending into said channel above the floor thereof, said pawl being pivoted at one of its ends in one wall of said channel for angular displacement by said finger into an off-normal position at least partially out of said channel in a plane substantially transverse to said displacement of said shuttle, the other end of said pawl being limitedly spaced from an opposing wall portion of said channel in the normal position of said pawl, said pawl having a convex outer surface for guiding an inserted weft thread toward the space between said pawl and said opposing wall portion and a concave inner surface for holding said thread in said channel confined by said pawl, and spring means acting upon said pawl for swinging said pawl from said off-normal position into said normal position upon disengagement of said finger by said pawl.

References Cited in the file of this patent UNITED STATES PATENTS 2,871,889 Schlosser Feb. 3, 1959

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