US1733191A - Thread-cutting mechanism for looms - Google Patents

Description

Oct. 29, 1929. A. A. GORDON 1,733,191

THREAD CUTTING MECHANISM FOR LOOMS Filed Oct. 12, 1926 s Sheets-Sheet 1 INVENTQF? ALBERT A GORDON Oct. 29, 1929. A. A. GORDON THREAD CUTTING MECHANISM FOR LOOMS 3 SheetsSheet 3 Filed Oct. 1.2., 1926 A T'oFe NE 5 Patented Oct. 29, 1929 camp STATES PATENT OFFICE ALBERT A. GORDON, OF vWORCESTER, MASSACHUSETTS, ASSIGNOR TO CROMPTON & KNOWLES LOOM WORKS, 033 WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS THREAD-CUTTING MECHANISM FOR LOOIMS Application filed October 12, 1926. Serial No. 141,194.

This invention relates to thread cutting mechanism for a weft replenishing loom of the pick-and-pick type, in which a plurallty of shuttle boxes are provided at the magazine end of the loom.

WVhen a substantially exhausted weft carrier is replaced, it is necessary to cut and remove the trailing weft end attached to the ejected weft carrier. At the same time it is necessary to leave intact the weft ends extending tothe inactive shuttles at the magazine end of the loom.

It is the general object of my present invention to provide a thread cuttingmecha nism of an improved type and so constructed that it will co-operate with and sever the thread extending to the ejected weft carrler, but will not sever the threads extending to the inactive shuttles.

Another object is to provide a thread cutter which will sever the ejected weft end adjacent the open end of the shuttle box and that will hold the portion of weft extending to the salvage in position for engagement by a second thread cutter located ajacent the selvag'e.

My invention further relates to arrangements and combinations of parts which will be hereinafter described and more particularly pointed out in the appenced claims.

A preferred form of the invention is shown in the drawings in which Fig. 1 is a plan viewof the magazine end of a loom embodying my improvements;

Fig. 2 is a front elevation of the lay and rotary shuttle boxes, taken along the line 22 in Fig. 1;

Fig; 3 is an enlarged left hand sectional elevation, taken substantially along the line.

33 in Fig. 1; i

Fig. 4; is a left hand sectional elevation,

taken along the line 4-4 in Fig. 1;

Fig. 5 is a plan'view of the thread cutter, adjacent the selvage, looking in the direction of the arrow 5 in Fig. 4;

Fig. 6 is a detail sectionalrear elevation, taken along the line 6-6 in Fig. 4

Fig. 7 is an enlarged side elevation of the movable thread cutter shown in Fig. 3; and

Fig. 8 is a sectional front elevation, taken along the line 88 in Fig. 7.

Referring to the drawings, I have indicated parts of a pick-and-pick loom of the general type shown and described in my prior application, Serial No. 16,791, filed March 19, 1925. i

I have indicated a loom frame 10, a lay 11, and a plurality of rotary shuttle boxes 12, mounted upon a support 13 and moved angularly through the selective co-operation of a gear 1 1 and rack bars 15. The parts thus far described are fully disclosed in my prior application and in themselves form no separate part of my present invention, which relates particularly to the thread cutting mechanism which I will now describe.

For the purpose of disposing of the weft end left trailing from the ejected weft carrier, I have provided two thread cuttingdevices, one of which is located adjacent the selvage of the fabric, and the other of which is movably mounted adjacent the open ends of the shuttle boxes. The thread cutter ad: jacent the selvage operates in a substantially fixed position, while the thread cutter adja-' cent the shuttle boxes is movable rearward to operative position. V, f

I will first describe the movable thread cutter which severs the thread adjacent the shuttle boxes. This thread cutter comprises two cutting jaws 20 and 21 Fig. 3), the jaw 20 projecting rearward from a supporting member 22 mounted on a fixed .pivot 23. The movable jaw 21 is pivoted at 24 on the member 22 and a spring 25 acts to open the jaws whenever the movable jaw is-released, as will be'hercinafter described.

The movable jaw is provided with an upwardly extending arm 26 having a cam lug by which an indication of weft exhaustion is transmitted from the weft detecting mechanism to the magazine. Whenever a transfer is indicated, the shaft 86 moves in the direction of the arrow a in Fig. 3, and the stud 34. acts against the cam surface 33 to depress the hook arm 28 and release the movable thread cutter, which thereupon moves rearward to operative position under the influence of a relatively strong spring 38 (Fig. 3). The rearward position of the thread cutter is determined by an adjustable stop screw 39, engaging a lug 40 on the loom frame 10.

A spring plate 41 (Figs. 7 and 8) is secured to the side of the movable jaw 21 and acts to hold the jaws in assembled relation and also to yieldingly engage the fixed jaw 20 when the cutter is closed and thus retain the severed Weft end in position for engagement by the second thread cutter, to be described.

Upon indication of transfer, the movable thread cutter is released as above described, and moves to the position indicated in dotted lines in Fig. 3, with the parts of the thread cutter disposed as indicated in Fig. 7. As the lay 11 then moves forward, a stud A mounted on a bracket 45 carried by the lay engages the upwardly extending arm 26 of the thread cutter and first closes the cuttingjaws and thereafter moves the thread cutter forward to position for re-engagement by the hook arm 28. The movable thread cutter is thus released for a single operation only upon indication of transfer.

'As the thread cutter moves forward, it raises the severed weft end W (Fig. 2) and holds it in a position substantially separated from the ends W extending to the shuttles in the shuttle boxes. In this position the ejected weft end W may be engaged by a hookshaped knife (Fig. 4) formed on a slide 51 mounted in a guide-way or casing 52 on the rear end of a yieldingly mounted bar 53. A spring 5 4 holds the knife 50 yieldingly in rearward position, and a depending-lug 55 extends downward from the knife 50 into the path of the lay 11. The position of the knife 50 in relation to the severed weft end W and to the other weft ends W is clearly indicated in Figs. 1 and 2 and is of great importance, as the problem of severing the ejected weft end without at the same time severing the other weft ends in a pick-and-pick loom has been the cause of a great deal of difficulty.

- The usual temple more closely adjacent the selvage will commonly be used in addition to r the two thread cutters shown in the drawapparent.

ings, but the temple is not illustrated in this application.

haustion and moves rearward to promptly box and the severed portion is held by the,

movable thread cutter until the jaws are opened upon the next rearward movement thereof upon indication of further weft exhaustion. I

Having thus described my invention and.

the advantages thereof, I do not wish to be limited to the details herein disclosed otherwise than as set forth in the claims, but what I claim is:

1. In a weft replenishing pick-and-pick loom, a lay, a plurality of shuttle boxes movably mounted at each end thereof, means to move the shuttle boxes at the replenishing end of the lay so that the active shuttle box will always be elevated above the inactive shuttle boxes, and means to sever the trailing weft end of the ejected weft carrier imme diately after indication of weft exhaustion and at points adjacent the shuttle box and also adjacent the selvage, while leavingthe wefts of the inactive shuttles intact. i

- 2. In a weft replenishing pick-and-pick loom, a lay, a plurality of shuttle boxes mov ably mounted at each .end thereof, means to move the shuttle boxes at the replenishing end of the lay so that the active shuttle box will always be elevated above the inactive shuttle boxes, and means to sever and hold the trailing weft end of the ejected weft carrier immediately after indication of weft exhaustion and to thereafter move said severed end forward and continuously upward and to retain said weft end in raised position, while leaving the wefts ofthe inactive shuttles intact. p I

3.,In a weft replenishing pick and-pick loom, a lay, a plurality of shuttle boxes mov ably mounted at each end thereof, means to move the shuttle boxes at the replenishing end. of the la so that the activeshuttle box will always e elevated above the inactive shuttle boxes, means to out the trailing weft end of the ejected weft carrier and to grip and elevate thesevered end,- and means to thereafter out said severed end a'second time at a point substantiallynearer the selvage while ,the first severed part of said Weft end is held elevated andthe wefts of the inactive shuttles remain intact. I

4. In a weft replenishing pick-and-pick loom, lay, a plurality of shuttle boxes movably mounted at each end thereof, means to move the shuttle boxes at the replenishing end of the lay so that the active shuttle box will always be elevated above the inactive shuttle boxes, means to sever and hold the trailing weft end of the ejected weft carrier immediately after indication of weft exhaustion, and to thereafter elevate the weft holding means by a forward and upward movement, and additional means effective to engage and sever the weft end, while thus held, at a point substantially nearer the selvage while leaving the wefts of the inactive shuttles intact.

5. In a weft replenishing pick-and-pick loom, a lay, a plurality of shuttle boxes movably mounted at each end thereof, means to move the shuttle boxes at the replenishing end of the lay so that the active shuttle box will always be elevated above the inactive shuttle boxes, means to cut the trailing weft end of the ejected weft carrier and to grip and elevate the severed end, and to thereafter hold said severed end until a further indication of weft exhaustion, and a hook shaped cutter adjacent the selvage efiective to separate the trailing weft end from the weft threads extending to the shuttles in the shuttle boxes and to sever said trailing enda second time, while a part thereof is still held elevated and while the wefts of the inactive shuttles remain int-act.

6. In a weft replenishing pick-and-pick loom, a lay, a plurality of shuttle boxes movably mounted at each end thereof, means to move the shuttle boxes at the replenishing end of the lay so that the active shuttle box will always be elevated above the inactive shuttle boxes, means to cut the trailing weft end of the ejected weft carrier and to grip and elevate the severed end, and to thereafter hold said severed end until a further indication of weft exhaustion,,and a hook shaped cutter adjacent the selvage effective to separate the trailing weft end from the weft threads ex tending to the shuttles in the shuttle boxes and to sever said trailing end a second time while the wefts of the inactive shuttles remain intact, both of said cutters being actuated by the lay on its forward movements and said first cutter being operated once only and being thereafter maintained in inoperative forward position until again released upon indication of transfer.

7 In a weft re lenishing pick-and-pick loom, a lay, a plura ity of shuttle boxes movably mounted at each end thereof, means to move the shuttle boxes at the replenishing end of the lay so that the active shuttle box will always be elevated above the inactive shuttle boxes, a thread cutter operative adjacent the open ends of the shuttle boxes and movable to and from operative position, means to hold said cutter normally in forward inoperative position, means to release said cutter upon indication of weft exhaustion, and means to thereafter actuate said cutter and return said cutter to normal inoperative position by a continuous upward movement as the lay moves forward, said cutter when in inoperative position being substantially elevated above its weft-engaging operative position.

8. In a weft replenishing pick-and-pick loom, a lay having a plurality of shiftin shuttle boxes movably mounted at each en thereof, means adjacent the open end of the active shuttle box effective to cut and hold the trailing weft end of an ejected weft carrier in the active shuttle box on the first forward movement of the lay after indication of weft exhaustion, and means to separate the trailing weft end from the weft threads extending to the inactive shuttles and to thereafter sever said separated weft end a second time and substantially nearer the selvage, while leaving the wefts of the inactive shuttles intact.

In testimony whereof I have hereunto affixed my signature.

ALBERT A. GORDON.

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