US2034487A - Weaving in looms having nipper shuttles for drawing weft threads from stationary supplies - Google Patents

Description

March 1936- R. ROSSMANN 2,034,487 WEAVING IN LOOMS HAVING NIPPER SHUTTLES FOR DRAWING WEFT THREADS FROM STATIONARY SUPPLIES Filed May 25, 1955 Patented Mar. 17, 1936 UNITED STATES PATENT orr ce wanvmc in rooms rmvmc mrrna srw'r TLES FOIL DRAWING WEFT FROM STATIONARY SUPPLIES THREADS Rudolf Ro'ssmann, Gautlng, near Munich, Gerg'nor to firm Tefag Textil-Finanz y, A. G., Zurich, Switzerland Application May 23, 1933, Serial No, 672,390 In Germany May 23, 1932 I 5 Claims.

This invention relates to an improvement in or modification of the method and apparatus for weaving in looms having nipper shuttles as claimed in the U. S. patent application Ser. No. 482,323 according to which each weft thread,

after being inserted in the'shed, is cut off to a" length somewhat greater than that required by' other, but in addition due to the thread ends" 20 of the weft tending to fray so that an unsightly pile may result in the finished selvedge. According to the present invention each end of the weft thread is held by a clip arranged adjacent to the edge of the fabric and the end of 25 the thread is drawn out of the clip as and when the ends are bent in. In this way the end of the thread is engaged by the clip until the bending-in operation is substantially complete.

In apparatus for carrying the invention into 30 practice there may be associated with each clip a movable device which engages the weft thread while the latter is still held by the clip, and draws the thread from the clip and bends the thread into the shed. Each clip and the associated 35 bending-in device are preferably constructed and relatively arranged so that as and when bendingin takes place the clip with the end of the weft thread in it enters or passes through an opening in the bending-in device and the latter then 40 draws the thread out of the clip.

Conveniently the bending-in of each end of the weft thread is effected by a device having,

its operative part formed as a tube, eye or the like through or into which the clip can vpass, 45 said device being movable in the direction of the length of theweft thread and into the shed, when the clip-holding the end of the weft thread will pass into or through the said tube or the like, whichthen engages the thread, inserts it 50 into the shed and at the same time draws the end of the thread from the clip.

Alternatively each bending-in device may comprise a member in the form of aehook which is moved between the warp threads, first in an 55 outward direction towards the edge of the fabric where it engages the weft thread between the clip which holds it and the adjacent edge of the fabric, the hook returning. and moving in the-inward direction thereby drawing :the weft thread into the shed and simultaneously drawing the end of the thread from the clip. 7

After insertion of each end of the weft thread Y into the shed, the ends of the thread are beaten up. by the beating-up operation to which the succeeding weft thread is subjected- If desired 10 however the bending-in could be effected during the formation of one of the succeeding sheds and the beating-up effected together with the .next weft thread. but one.

When the hooked type of bending-in device is employed the angle of the hook preferably lies in a plane parallel to the warp thread whilst each clip may hold an end portion of a weft thread so that 'this end portion is inclined to the main part of that thread which lies in the shed. The hook will thus not tend to engage the warp threads as the bending-in device'ls moved during operation, whilst, in addition, the hook will readily engage the weft thread between the clip and the edge of the fabric. Each'clip '25 thus tends to give a slight twist to the weft thread so that the end of the weft is bent or forms a loop which can be readily'engaged by the hook on the bending-in device. To facilitate such engagementeach clip may bemo'ved substantially parallel to the warp threads so that as the hooked portion of the bending-in device emerges from the shed the weft thread adjacent to the clip is engaged by the hook.

' With a view to obviating the possibility of the hook portion on the bending-in device fouling or engaging the warp threads the part which carries the hook is enlarged adjacent to the hook.

in a direction transverse to the plane of the hook. During movement of the bending-in de- 40 vice through the warp therefore the warp threads are forced apart by the thickened partof the bending-in device and the hooked end can pass freely between the separated warp threads. If

. desired the hooked end of the bending-in device may be furnished with a latch adapted to close V the hook during the return or inward movement of the bending-in device, thereby obviating the possibility of a warp thread being engaged by the hook during the returnmovement of the bendingin device.

coming'disengaged from the bending-in device until the bending-in operation is complete.- The bending-in operation is thus effected accurately 'so that the ends'ofeach thread are perfectly anchored in the cloth and these ends cannot turn up to form'a pile in the seived8e.

In the accompanying drawing Fig. i is a diagrammatic showing of a modi-,

fled bending-in mechanism with the bending-in finger in rest position. 7

-Fig. 2 is a side view of the showing of Fig. 1 taken in the direction of the arrow on Fig. 1.

Fig. 3 is a diagrammatic showing of the bending-in mechanism as per Figs. 1 and 2 with the bending-in finger in the position it takes ust before picking up the end of the thread to be bent in.

Fig.4 is .a 'sideview of the showing of Fig. 3 taken in ,the direction of the arrow on Fig. 3.

Fig. 5 is a diagrammatic showing of the bending-in mechanism as per Figs. 1 and 2 with the bending-in finger in the position it takes Just after picking upthe thread end to be bent in. Fig. 6 is a side view of the showing of Fig.6.

Fig. 7 is a diagrammatic showing 'of the bending-inmecha'nism as per Figs. 1 and 2 -with the bending-in figure and the thread-end grippers in the position they take after having placed the thread-end'in the desired position.

Fig. a is aside view of the showing of Fig. 7..

Fig. 9 1s a detailside' view of the end of the finger used in connection with the mechanism illustrated by Figs. 1.to.8. Y

Fig. 10 is a top view of the finger-end illustrated by Fig. 9. v I Fig. 11 is a detail side view of the finger-end used in connection with the mechanism illustrated by Figs. 1 to..8and having a lock.

Fig. 12 is a top view of the showing of Fig. 11. Fig. 13 is a diagrammatic showing of the clippers holding the weft thread and in open position.

Fig. 14 is a side view of the showing of Fig. 13. Figures 1 to 8 inclusive illustrate an-alternative arrangement of apparatus according tothe invention. In this arrangement aclip r' is arlranged adjacent to the edge pf the cloth havingclamp'ing jaws t1, h" for engaging the end 9' of a weft thread a, whereby the end of the thread within the jaws ti, t1"'lies in a direction at right angles to 'the'lengthof the warp threadsas clearly shown in Figure 2 which is a side view fromleft to right of the arrangement illustrated wise direction so that the hooked portiona is in Figure 1. an operative portion 0' carried on an arm is pivoted on an axis i, thefree end of the'portion a" *being furnished with 'a hook o with .the arm h lying .below the plane of the fabric.

When a weft thread has been inserted,'beaten up by the reed k and engaged by the'clip r' between the corresponding edge of thefabric and thepoint of weft supply, a slight twist is im-' parted to the end a of the weft a due to, the

position of the jaws ti and tr, as shownin Fig-' ure 2. The weft thread is then cut oil! adjacent to the clip 1" whereupon the reed It moves back and-a new shed is formed. The arm 71 is now rocked about the pivot i in the counter-clockmoved in the outward direction, that is to, say

towards the edge .of'the fabric so as to pass be-' tween the warp threads indicated at b', b" intov the shed, as clearly shown in Figure 3, this. forward movement of the bending-in device 'con. tinuing until the hook o emerges adjacent to the clip 1''. As the hooked end of the portion 9' access? and substantially parallel to the length The bending-in device comprises 4 emerges, the clip r towards the hook in a direction indicated by the arrowin Figuret m:

fabric so that the end a of the weft which lies between. the edge of the fabric and'the clip 2" passes intothe hook o, the end a of the weft v thread thus being looped about the end of the bending-in device a as shown in Figure 4. At this operation some of the warp threads overlying a'are slightly distorted as, e. 3., threads" on Figure 4; The arm h andoperative portion a of the" bending-in device are now moved in the reverse or inward direction, 1. e. from the edge of the fabric inwards, so that the end a of the weft is pulled in the form of a loop into the shed, as shown inFiguresB and 8, the end of the weft thread being at the same time drawn out of the clip 1*. When the bending-in operation is complete, the jaws ti and ti" are in the position shown in Figure 7, the succeeding weft thread-is picked into the shed and beaten up I by the reed Is, this beating-up. operation simultaneously beating the bent-in-ends of the previ- 5- tion a of the bending-in. device is furnished on opposite sides with ribs-u, u". Thedimension In the construction of the portion a'- as measured in a directiozi'at right angles to theplane of the hook o towardsthe hook, and when the hook-o'moves between the warp threads, these are held spaced apart by the ribs 11', u" a suflicient distance to allow the hook to pass between-the warp threads without engaging them.

A further construction of the operative v for the bending-in device is illustrated in Figures 11 and 12in which a latch p is pivoted at time thatafter the end of a weft-thread has en-' gaged by the hook and the operative g has commenced to move on itsreturn on inward movement between the warp threads, the latch c clear-ofthe hook, as soon as the hook a proaches the end of weft thread to.

' I claim:

. 1. Mechanismfor bending a tvefttliread over theedge of the fabric of' which itforms a part and for weaving said weft thread into the warp threads of said fabric, said mechanism consisting substantially of a holder for holding. said weft swingingly operated bending-in device having a hookfor movement between the warp threads to: ward the-edge of, the fabric, engagement with said closes over the hookwhich is thus prevented from eng ging the warp threads. The latch ai s how-' ever returned to its open position, that isito say thread during the bendingin' operation and a weft thread, reversal of the direction of move-- ment and pullling said weft thread in between' I said warp threads and out of said holder.

. 2. Mechanism for bending a weft thread over the edge of the fabric of which it forms apart threads of said fabric; said-mechanism consisting and for weaving said weft thread into the warp Y substantially of a holder adapted to hold. said weft thread during the bending-in operation and is; l,

, threads, reversing the direction of movement and pulling said weft thread in between said warp threads and out of said holder, saidbending-in device being, adjacent to the hook, and in a direction transverse to the plane of said hook, enlarged for the purpose set forth.

3. Mechanism for bending a weft thread over the edge of the fabric of which it forms a part and for weaving said weft thread into the warp threads of said fabric, said mechanism consisting substantially of a holder adapted to hold said weft thread during the bending-in operation and a swingingly operated bending-in device having a hook for movement between the warp threads toward the edge of said fabric, engaging said weft thread, reversing the direction of movement and pulling said weft thread in between said warp threads and out of said holder, said'hook being provided with a latch adapted to close said hook during the reverse movement or the bending-in device.

4. Mechanism-for forming a selvedge by bending over a cut weft thread end and weaving it into the warp threads comprising movable means for holding the weft thread end and swinging bending-over means for pulling the weft thread in between the warp threads and out of said holder, substantially as described, as, and for, the purposes set forth.

, 5. Mechanism for forming a selvedge by bending over a cut weft thread end andweaving it into the warp threads comprising movable means for twistingly engaging and holding the weft thread end and bending-over means for pulling the weft thread in between the warp threads and'out of said holder, substantially as described and as, and for, the purposes set forth.

RUDOLF RQSSMANN.' 20

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