US2072158A - Weft inserting apparatus for looms with fixed weft bobbins - Google Patents

Description

March 2, 1937. p w s 2,072,158

WEFT INSERTING APPARATUS FOR LOOMS WITH FIXED WEFT BOBBINS Filed Feb. 3, 1933 INVENTO R FWMO/Vfl Din A5 ATTORNEY Patented Mar. 2, 1937 UNITED STATES WEFT INSERTING APPARATUS FOR L OOMS WITH FIXED WEFT BOBBINS Raymond Dewas, Amiens, France Application February 3, 1933, Serial No. 655,021 In Germany February 19, 1932 1 Claim.

The present invention relates to weaving looms with continuous feed by means of fixed weft bobbins.

It has for its object a device for inserting the weft as single threads more particularly applicable to vertical looms and is characterized by:

A weft feeder or pirnless shuttle having a body of bifurcated form between the prongs of which there is a spring clip shaped like a hairpin, the

springy prongs of which are arranged in the same direction as the prongs of the bifurcated member, are in contact with one another for a great part of their length and are bent over towards the outside at their ends so as to facilitate the introduction of the end of the weft thread which must be passed through the shed.

A member intended to present to the weft feed er, at the moment when it enters the shed, the taut weft at the entrance of the said shed, the said member consisting of a clip which may have the same shape as that of the weft feeder and which is mounted, either on the sley or in some other suitable manner.

A member which has for its object the free- 5 ing of the end of the weft from the weft feeder after the passing of the thread.

In order to explain the invention, and by way 'of an example of application, the latter is described and illustrated hereinafter, applied by 0 way of an example to a vertical loom in which the parts of the loom, generally, are arranged vertically, the threads of the warp and the shed being vertical, the weft feeder passing vertically from top to bottom through the vertical shed, and 35 the return movement of the weft feeder and its subsequent throw being ensured by suitable transporters and distributors of an already known design.

In the drawing: 0 Figure 1 is a perspective view in elevation of the weft feeder.

Figure 1a is a section along the line a-a of Fi 1.

Figure 2 is a detail view showing the spring 45 clip which holds the weft and which is arranged in the inside of the weft feeder between the prongs.

Figure 3 is a side elevation of a vertical loom,v a single weft thread having been passed through and beaten up, the said weft being caught by the clip on the sley.

Figure 4 is a similar view, the shed having been formed and theweft stretched at the en- 55 trance of the shed in the path of the weft feeder in order to be gripped and carried along by the latter through the shed.

Figure 5 is a plan view ,of Figure 4 seen from above.

Figure 6 is a side elevation of the guide.

Figure 7 is a section through the guide along the line 1-1 of Fig. 6.

The weft feed consists principally of a weft carrier I, preferably of metal, of bifurcated form having two prongs 2 on account of its being di- 6 vided for the greater part of its height by a centrally disposed slot 3. In this slot and disposed in seats 2a and 21) (Fig. la) arranged on the interior faces of the slot is placed the spring clip 4 which consists of a fiat band bent into the shape 15 of a hairpin (Fig. 2), the prongs 5 of which are arranged in the same direction as the prongs of the bifurcated part, in springy contact with each other and at their ends 5' bent outward so as to facilitate the insertion of the end of the weft thread which is to be introduced into the shed.

The clip 4 is held in the slot 3 of the weftcarrier i by its ends 5' situated within the seats 21) and by its round portion situated within the seat 2a (Fig. la).

The diflerent members of the loom are arranged vertically and are as follows: 6 is the warp beam, 1 are the threads of the warp divided into two groups of threads la and 1b when they form the shed 8, and 9 is the cloth roller.

i0 is the sley and H are the healds.

i2 is a spring clip which seizes hold and presents the weft to the feeder. This clip is similar to the clip 4 of the body part I and is arranged in any desired way at the end of the sley Ill, holding the end of the weft l3, stretched between it and the feed bobbin l4, passing through the eyelet i5 which is arranged at the end of the guide piece i5 of the distributor for the weft feeder i, the tension of the weft 43 being ensured automatically by a mobile tensioning rod l6 which takes up the slack of the weft which is required by the play of the sley when the weft is beaten up.

Owing to this device for inserting the weft, when the end E3 of the weft thread I3 is held in the spring clip i2 and the sley ID has moved back towards the healds ll (Figure 1) the weft I3 is stretched across the shed 8 (Figure 5).

The weft feeder l on leaving the guide 50 piece I5 will be disposed astride the thread l3 which is stretched, gripping it between its prongs 5 which form part of the clip 4. The thread is easily engaged between the ends 5 of the clip 4 due to the shape thereof. when the thread I! 66 is moved, its resistance will partly balance that exerted by the clip I2 on the end I3; the thread I3 will be moved further towards the round portion of the clip 4 and will be held more and more tightly by the prongs 5, until the gripping force of the prongs 5 will be stronger than the force exerted by the clip I2 on the end I3. This will cause the pulling of the end I3 of the weft thread I3 out of the springy clip I2 of the sley "I.

When the weft feeder I has traversed the shed the sley ID will beat up the weft which has beenpassed and the clip I2 will seize, at the point of weaving of the piece of stuff I I (Fig. 3), the weft which comes from the bobbin and which is guided over asmall cutting blade I 8 which severs it between the said point I! and the said clip I2, the end of the cut thread I3 thus remaining held in the clip whilst the sley moves backwards and the movable tensioning rod I 6 maintains the tension of the weft I3 between the clip and the bobbin.

Figures 6 and 7 illustrate the cooperation of the weft carrier I with the guide I5. As shown in these figures, the guide I5 has the form of a hollow rectangular tube. The weft carrier I is caused to move within this tube by any suitable means of the generally known type.

The weft is inserted from only one side of the loom, namely, from top to bottom by the weftcarrier I which is either thrown or falls by gravity from the guide piece I5; the weft-carrier I grasps the weft thread stretched across the shed 8 above the upper threads of the warp Ia and lb and between the eyelet I5' and the clip I2, and then passes through said shed.

After the weft-carrier I carrying the weftthread has passed through the shed 8, the sley It) beats this thread against the preceding thread of the fell I! of the cloth.

The thread pressed against the fell is held in the usual manner by the change of the shed which traverses the divided threads of the warp.

The weft-carrier, after having passed throughthe shed 8 is stopped and pushed into a guiding member or groove bringing it to a conveyer which transports it to the guidepiece I5. From there, it is again thrown through another shed, since obviously there are many weft-carriers which are thrown successively one after another through successive sheds.

The end I3 of the weft-thread is disengaged from the prongs 5 of the clip 4 at the time when the weft-carrier is pushed into the groove towards the conveyor. The end I3 of the weft-thread is caused to slide along the prongs 5 until it leaves these prongs by the tractive force exerted by the weft-carrier which is moving in the groove.

It is also possible to provide a finger attached to the inner portion of the sley II) which pushes the thread stretched between the inner extremity of the cloth and the weft-carrier after the latter has passed through the shed 8. This finger pulls the thread out of the prongs 5 of the clip 4.

I claim:

A device for inserting the weft as single threads by a pimless shuttle or weft feeder for weaving looms having fixed weft bobbins, more particularly for vertical looms, said device comprising a weft feeder of bifurcated form, said weft feeder comprising a pair of prongs; and an elastic clip having the shape of a hairpin and situated between the prongs of said weft feeder, said clip comprising a pair of elastic prongs; the prongs of said clip extending in the same direction as the prongs of said weft feeder and being in contact with the prongs of said weft feeder, the ends of the prongs of said clip being bent outwardly to facilitate the insertion of the weft-thread.

RAYMOND DEWAS.

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