US1632912A - Weft-feeding device for weaving looms - Google Patents

Description

1,632,912 June 9 A. MULLOR ET AL WEFT FEEDING DEVICE FOR WEAVING LOOMS Filed March 23, 1926 5 Sheets-Sheet 1 1 632 912 June 1927' A. MULLOR ET AL WEET FEEDING DEVICE FOR WEAVING LOOMS Filed March 23. 1926 3 Sheets-Sheet 3 34 6 .523 6 d 36 5 a; 5 a] Patented June 21, 1927.

UNITED STATES 1,632,912 PATENT OFFICE.-

nnvmo mmnoa, or scnAux, raanca, AND Lotus cannon, or cmm'r, BELGIUI.

, WEI'I-I'EEDING-DIVICE FOB WEAVING LOOKS.

Application fled larch 28, 1826, Serial No. 96,673, and in. France March 88, 1925.,

This invention relates to weft feeding devices for looms and itha for its object to provide a device of this kind in which the weft is continuously fed in loop form without re uiring the shuttle to be stopped before it reac es the end of its travel in either direction. Anotherobject is to provide suitable means for tensioning the weft threads passed through the shed and further ob ects will be apparent from the following descr1ption.

According to our invention we provide on the one hand a thread-carrier on the shuttle and on the other hand we arrange at the entrance of each shuttle box a thread-presenting guide and an oscillating thread-gripping hook, arrangement being such that, on

each travel in the same direction of the shuttle, the thread fed from the supply selvedge, is caught by the thread-carrier on the shuttle, carrled thereby through the shed and delivered to the oscillating hook which lays it in loop ,form at the other selvedge.

In carrying out our invention We referably use a shuttle of ordinary design aving a portion cut away on its upper side and 'pr0 vided at each end with a fork-shaped threadgripping member. These members 'have their thread-gripping faces turned inwardly so that in either direction of travel the thread will be seized by the rear fork. On each side of the loom is a supply bobbin from which the weft thread is led to the selvedge through the guide which holds it across the path. of the forks on the shuttle. The weft thread being seized by the rear forklis carried throu h the shed and, as it reaches the other en it is caught by the oscillating hook which is lowered between the tines of the fork, disengages the thread from the fork-and drops it in loop form at the selvedge as the lay is being actuated.

Means are preferably provided for tensioning the loop or weft. To this end, as the shuttle enters the shuttle box it acts through suitable connections on a brake at the feeding end of the weft thread which is thus tensioned at the very moment a tightening of the loop is required. The brake mayalso be controlled by cam action but in that case it has been found that the thread is liable to break owing to undue stretching, whereas when the braking action is timed by the shuttle itself such accident is entirely precluded. v

bobbin through said guide to the nearest In order that our invention may be better understood weshall describe an embodiment thereof with reference to the accompanying drawings in which:

Fi 1 shows aside. elevation of 'a loom provided with our improved weft feeding device.

Figs. 2 and 3 are respectively a plan and an elevation of the shuttle on an enlarged scale, F ig. 4 being an enlarged cross-section on line A-B of Fig. 2.

Figs. 5 and 6 show separately one of the forks of the shuttle in front and side elevation.

Fig. 7 is a diagrammatic plan view of the shuttle race.

Figs. 8, 9 and 10 respectively show a plan view, a side elevation and an end view of the left hand shuttle box, the picker being removed in Fig. 10.

Fig. 11 is a side view of the thread-presenting hook. v

Figs. 12, 13 and 14 illustrate the engagement of the thread by the oscillating hook.

Figs. 15, 16, 17 and 18 illustrate the positioning of the loop at the selvedge by means of the oscillating hook.

- Fig. 19 is a side View of the cam controlling the operation of the thread-gripping hook.

' Figs. 20 and 21 are a side view and a sectional view of the brake for tensioning the Weft thread.

Referring to Fig. 1, 20 denotes the loom frame, 21 the main shaft, 22 the cam shaft,

23 the lay and 24 the lay swords pivoted at 25 and operated by shaft 21 through the cranks 26 and links 27 a is the warp controlled in the usual manner by the healds 28 and b is the weft fed at each side from a bobbin 29 located on the floor or on any suitable support.

The shuttle 30 is cut away on the top and provided at each end with a fork 31 (Figs.

2 to 6) secured thereto by means of a pin 32. The tines of the forks 32 have an inclined top face 33 and a thread-engaging reoess 34, ese recesses being turned inwardly, 1. e. faclng each other, as shown in Fig. 2.

At the entrance of each shuttle box 35 (Fig. 7) are the thread-presenting means'36, 37 for co-operating. with the shuttle as it is shot outwards, and the oscillating threadgripping hook 38 for co-operating with the no shuttle as it flies into the box. The thread-presenting means comprise an The weft thread extending from the eye 36 on a rod 39, ahd a hook 37 secured to the rail on the lay 23 (Figs. 8 to bin 29 to the selvedge 70 (Fig. 7) .passes through the e 'e 36 and thence under the hook37 where y it is held across the path of the forks 310 the shuttle. Owing to the incline '33. at the p'of the forks, the thread I will slide over the front fork but it will be 1O caught and carried away in loop form by the recess 34 in the rear fork on the shuttle being shot outwards. The rod 39 is pivoted to the frame at 41 (Fig. 1 and actuated by the cam shaft 22 through t e link 42 and the roller 43 on thecam arm 44, the movement of the rod 39 being intended to lift the weft thread out of the path of the thread-engagin forks when the shuttle flies in.

%he oscillating hook 38 (Figs. 8 to 10) is mounted axially of the'shuttle on a shaft 45 mounted in bearings 76 on the rail 40. To theshaft45 is secured an arm 46 connected to a rod 47 pivoted at 48 (Fig. 1) to an oscillatin'g lever 49. This lever is pivoted at one end to the frame at 50 and it carries at its other end a roller 51 riding on a cam 52 secured to the-cam shaft 22. As shown in Figs. 12 to 18 the hook 38 is provided with a wedge-shaped tail piece 53 for thepurpose of assisting the hook in picking up the weft thread from the fork 31 as will be ex lained hereinafter.

11 its way from the bobbin 29 to the thread-presenting 'means 36, 37 the weft thread passes between the jaws 54, 55 of a brake actuated by the-shuttle as it reaches the far end of the race in order to secure the desired tensioning of the weft. To this end we utilize, in the example illustrated, the

shaft 56 of an automatic stop mechanism of current design, which is mounted in bearings 66 in the lay-swords 24. This shaft is held by the spring 57 in such position that a dog 58 on said shaft is adapted to strike against an abutment 59 (Fig. 1) and stop the operation of the lay swords when the shuttle fails to reach the shuttle-box. When the shuttle operates normally, it moves the box swell 60 on entering the shuttle box (Figs. 8 to 10 and thus causes the lever 61 to rock the sha 56 and lift the dog 58 out of the path of th .sto; 59, as is well known.

r the purposes of the'present invention the shaft 56 is extended at both ends under the shuttle boxes 35, and to each end of shaft 56 is secured an arm62 connected by links 63, 64 to a spindle 65 on which is secured the brake jaw 55 (Figs. 10, 20, 21). The brake jaw 54 is stationary and secured to a frame 67 secured to the lay by means of an arm and having e elets 68, 69 for guiding theweft thread 5. e brakes at both ends ofthe shuttle race are actuated at the same time, but onl one is operative, i. e. the thread is tensioned by the right-hand brake when the shuttle enters and vice-versa.

When the loom is not provided with a stop I motion mechanism offthe: kind. described, a

rock shaft such as 56 can ..easily be 'fittedum der the lay and shuttle boxes. f

- The operation is as follows:

tion of Fig. 12. The hook being centrally.

positioned in the path of the forks 31, the

the left-hand box fork tines will pass on either side of it and the wedge-shaped tail piece 53 will engage beneath the portion of the thread 6. extending across the two tinesof the rear fork 31 (Fig. 13). The shuttle continuing itsmotion the thread is raisedby the tail 53 which picks it. off the fork and drops it into the rearwardly curved book 38 (Fig. 14).

As the lay advances to beat up the weft the hook 38 swinging on its pivot 45 in the di* 'rection of the arrow (Fig. 15), carries the end of the loop to the selvedge (Fig. 16). The lay continuing toadvance, the hook 38 is then swung inthe opposite direction (Fig. 17) drops the end of the loop at the selvedge 70 and resumes its inoperative position shown in Fig. 18. In order successively to imipart to the thread-gripping book 38 two di erent oscillating movements the cam 52 (Fig. '19) has two cam portions 72, 73 for controlling the operation of the hook and holding it in its position of rest.

Meanwhile, as the shuttlereachos the end of its travel and enters the shuttle box it moves the box swell 60 about its pivot 74 (Fig. 8) and through the medium of the arm 61 it'causes the abutment shaft 56 to turn slightly in the direction of the arrow (Fig. 10). By means of the arm 62 and links 63,

64, this movement is transmitted to the spindle 65 which moves the brake jaw 55 towards the jaw 54 and grips the thread 5. While, as stated before, the shaft 56 actuates at the same time the brakes of the two shuttle boxes, in the position illustrated in Figs. 8 to 10 (with the shuttle within the left-hand box) it is obviousl the'operation of the righthand box brake t at MS under tension the loop just transferred mm the shuttle to the left-hand hook 38. By thus placing the operation of the brake under the control of the shuttle itself, we are able to time exactly the tensioning of the weft and avoid any undue stretching and breakage of the loop.

When the shuttleis shot out of the box 35 the box swell 60 and shaft 56 resume their initial positions under the action of the spring 57 and the released brakes permit the free passage of the thread. The braking ac- It is obvious that changes may be made in the arrangement of the thread-enga ing means on the shuttle and in the shape 0 the co-op'erating means on the lay without de- 3 parting from the scope of the appended claims.

1 We claim:

1. In a loom, the combination of a lay, a

weft supply, a shuttle on said lay, a forkshaped thread-carrier on said shuttle having its tines in a plane extending transversely of the shuttle, thread-presenting means on said lay, a downwardly extending thread-gril ping member on said lay for picking up weft thread from'said thread-carrier, and means for causing said thread-gripping meimber to drop the weft thread at the selve ge. a

2. In a loom, the combination of a lay, a weft supply, a shuttle on said lay, threadenga ging means on said shuttle, means for presenting the weft thread to said threadengaging means, and an oscillating member on the lay for picking up the weft from said thread-engaging means and dropping it in loop form at the selvedge.

3. In a loom, the combination of a lay, a weft supply, a shuttle on said lay, a threadengaging fork on said shuttle, means for presenting the weft thread across said fork, and a thread-gripping hook pivotally arranged on the lay centrally of the path of said fork and adapted to pick up the thread therefrom.

4. In a loom, the combination of'a lay, a weft supply. at each end of said lay, shuttle boxes and a shuttle on said lay, a threadcarrler on said shuttle, means at the entrance of each shuttle box respectively for presentmg the thread to said thread-carrier on the shuttle flying out and for picking up the thread from said thread-earner on the shuttle flying in, means for controlling the operation of said thread-presenting and of said thread-picking up means, means for tensiomng the thread from each weft supply, and means controlled by said shuttlefor operating said tensioning means.

5. In a loom, the combination of a lay, a

shuttle on said lay, a pair of u standing forks secured each to one end of said shuttle, the tines of said forks having an outwardly sloping top face and an inwardly turned thread-engaging recess, and thread-gripping means on said lay adapted to co-operate with said forks.

. 6. In a loom, the combination of a la ,a shuttle on said lay, a thread-engaging ork on said shuttle, a thread gripping hook pivoted to said lay and located centrally of the path of said fork, and means for rocking said hook.

7. In a 100m, the combination of a lay, a shuttle on said lay, a thread-engaging fork on said shuttle, a thread gripping member pivoted to said lay and located centrally of the path of said fork, said member c0mpris-' ing a hook and a wedge-shaped tail piece adapted to pass between the tines of said fork, and cam-controlled means for alternately swinging said member through different angles.

8. In a loom, the combination of a lay, a weft supply, a shuttle on said lay, a threadcarrier on said shuttle, means for presenting the weft thread to said thread carrier, means on said lay for picking up the thread from said thread-carrier, and means between said weft supply and said thread-presentmg means for braking the weft thread.

9. In a loom, the combination of a lay, a weft supply, a shuttle on said lay, a threadcarrier on said shuttle, means for presenting the weft thread to said thread-carrier, means for removing the thread from said threadcarrier, and means controlled by said shuttle for braking the weft thread.

10. In a loom, the combination of a lay, a weft supply, shuttle boxes and a shuttle on said lay, a rock shaft extending below said lay and shuttle boxes, means in each shuttle box for controlling the motion of said shaft, said means being controlled by said shuttle,

a thread-carrier on said shuttle, thread-presenting and thread-gripping means on said lay for 'co;operating with said thread-carrier, and thread-braking means controlled by said shaft.

In testimony whereof we aflix our signatures.

ALVARO MULLOR. LOUIS CARRIOL.

Images