US1716045A - Thread cutting and removing mechanism - Google Patents

Description

June 4, 1929. lA. A. GoRDoN ET AL 1.716.045 u THREAD CUTTING AND REMOVING MECHANISM Filed June 2l, 1927 2-SheetsSheet l June 4, 1929. A,

A. GORDON ET A1. 1,716,045

THREAD CUTTING AND REMOVING.MECHANISM Filed June 21, 1927 2 sheets-sheet 2 ATTO/PNE ys Patented June 4, 1929.

anat;

'r eric.

ALBERT A. GORDON .AND ALFRED F.V MOR-BELL, OF WORCESTER, MASSACHUSETTS,

ASSIGNORS TO CROMPTON & KNGWLES LOOM WORKS, F WORCESTER, .MASSACHU- SETTS, A CORFORATION OF MASSACHUSETTS. .y

THREAD CUTTLENGl AND Application filed June 21,

This invention relates to a loom in which the weft is automatically replenished, and relates more particularly to mechanism for presenting a weft end to a thread cutting device, for severing the weft end, and for re- 'as the trailing weft ends left on transfer will y be drawn into the cloth if not promptly removed, and will cause defective cloth thereby. In a pick-and-pick loom, it is also difficult to distinguish between the trailing weft'ends re-A sulting fromweft replenishmentand the idle wefts from theinactive shuttles.

1t is one important object of our invention to provide improved means for promptly presenting the trailing 4weft ends to a thread cutter, to be severed thereby. Another object is to provide a thread cutter which will beoperative to cut the trailing weft ends butwhich will not interfere with the idle wefts. further `feature of our invention is to provide a device for promptly removing the' severed weft ends from a position in which they might possibly be drawn into the cloth.

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

A preferred form of Jthe invention is shown in the drawings in which Fig. 1 is a sectional end elevation of parts.

of a loom embodying our invention;

Fig. 2 is a plan view of our improved.

mechanism g Fig. 3 is an enlarged sectional end clevation of certain parts, taken along the line 3-3 in Fig. 2;

Fig. 4 is a detail plain view, looking in the direction of the arrow 4in Fig. 3; y

Fig. 5 is a detail sectional front elevation, taken alongthe line 5,-5 in Fig. 3; f

Fig. 6 isa detail sectional front elevation, taken along the line 6-6 in Fig. 3

Fig. 7 is a sectional end elevation, taken along the line 7 -7 in Fig. 2; and

Fig. 8 is an enlarged detail end elevation, looking in the direction of the arrow 8 in Fig. 2.

REMOVENG MECHANISIVI.

1927. Serial No. 200,472.

Referring to the drawings, We have shown portions of a weft repleni'shing, pick-andpiclr loom including a loom frame 10, a breastbeam 11, a lay 12 mounted on swords 13, a bottom cam shaft 14, and a temple thread cutter 15, all of the usual construction.

lVe have also indicated a rotary support 16 for a plurality of shuttle boxes 17, operatively positioned by a gear 18 selectively engaged by racks 19 and 20. Each shuttle box 17 is provided with a thread clamp 21, mounted on top of the shuttle boX and yieldingly actuated by a spring 22. A clamp releasing member 23 engages the clamp 21 as the lay moves forward, thus releasing the clamp fora certain limited time interval on each forward Inovement of the lay.' Y y Fora more complete description of these parts, reference is made to my prior Patent No. 1,663,941, dated March 27, 1928.

A thread cutting and clamping device 25 (Fig. 7) is mounted on the loom frame 10 adjacent `the rotary shuttle boxes 21, `and is normally` held in inoperative position by a` latch 26, adapted to be'released by a'stud 27 on an arm 28 secured to the rock shaft 29pthrough which an indication of weft exhaustion is transmitted.

Upon such indication,l the cutting and clamping device 25 is released and moves rearward to grasp and sever the weft threadI attached to the weft carrier about to be ejected. The thread cutter on the device 25 operates as the lay moves forward, severing the weft endandk holding the portion there.- of which extends to the selvage.

The cutting and clamping device l25 is again engaged by the latch 26 as the llay reaches front center and is retained in forward position until tl'ienext indicationof transfer. For a more complete description of the operation of the cutting and clamping device 25 and the parts. associated therewith, reference'is made to the prior application of Albert A. Gordon, Serial No. 141,194, filed October 12, 1926.

ln, the working out of our invention, we have provided a vthread cutterof special design which is mounted adjacentthe selvage, above the plane of the cloth, and to the rear of the fell of the cloth. Our improved thread lcutter comprises a stand 30 yhaving-a cutter 31 slidably mounted therein and yieldingly pressed rearward by a spring 32, the normal l3 and 4. The cutter 3l has a hook-like blade formed on its upper edge.

A holding arm 33 is pivoted at 34 on the stand 30 and has an upwardly extending portion 35 engaging a cross bar 36 and normally positioned thereby. The cutter 3l has a depending portion 38 engaged by an upwardly extending arm 39, pivoted at 40 `on a bracket 4l secured to the breast-beam 1l.

The arm 39 has a rearwardly extending portion 42 (Fig. 3) having a cam-like lower face43 resting upon a roll 44 carried by a bracket 45 secured to the lay l2. As the lay moves rearward, the arm 42 is moved upward, thereby advancing the arm 39 and giving the cutter 3l an operative movement. As the lay moves forward the cutter returns to the inoperative position shown in Fig. 3.

An important featurefof our invention relates to the thread positioning member (Figs. 3 and 5) by which the weft ends are presented to the selvage thread cutter 3l. The member 50 has a hook-shaped lower end 5l andit is also provided with a depen ding hook-like wire or projection 52.

The member 50 is pivoted at 53 on a projection 54 of the lay 12 and has an upwardly projecting arm 55 to which a spring 56 is connected, the rear end of the spring being connected te the loom frame 10, as indicated in Fig. l. A light spring 57 is also connected at its front end to the positioning member- 50 and at its rear end to an upward projection 53 on a bracket 59- secured'to the lay l2. As the lay moves rearward, the spring 56 Aloses its tension andthe light spring 5?` swings the positioning device back out of the path of the shuttle, as indicated in dotted lines in Fig. 3. As the lay thereafter moves forward, the spring 56 is tightened, overcoming the light spring 57, and swinging the device 50 to the position indicated in full lines (Fig. y

In' its forward movement, the hook-shaped portion 5l engages the weft end l of the fresh weft carrier in the shuttle which has just been picked -to the opposite or non-replenishing side of the loom. At the same time the depending hook 52 engages the part of Ythe weft end W pertaining to the substantially exhausted weft carrier just ejected from the running shuttle and extending from the selvage to the clamping device 25. On the replenishing pick or beat-up, the weft end lV is too close to the shuttle race to be engaged by the hook 52, but on the nent sucA ceeding beat-up it is elevated by the clamping device 25 to a position in the path of the hook 52. V

Both of these weft ends W and W7 are moved forward and upward by the positioning member 50, as indicated in Fig. 8, so that they are carried .over the hook-like rear end of the cutter 3l and are deposited in front of the upper cutting blade thereof, in which position they are retained by the rearwardly `projecting arm 33, which has been swung yieldingly upward to permit their insertion thereunder.

The forward and upward swinging movement of the member 5() takes place before the lay l2 reaches its front center, so that the hook-like projections thereof are raised above the cloth and cannot engage the idle wefts. As the lay thereafter nieves rearward, the arm 39 is actuated to push the cutter 3l forward, severing the weft ends thus inserted over the hook-like blade of the cutter. l

It will be noted that the weft end W is held elevated by its clamp 2l and the weft end WV is held elevated by the device 25, so that both of these weft ends may be engaged by the swinging member 50, while the regular weft during weaving operations will lie close to the shuttle race, and will be cleared by the hook 52.

In order to prevent .the possibility of the new weft end VV being carried into the cloth we have provided a withdrawing member60 (Fig. l) slidably mounted in a bracket 6l and having a hook 62 at its upper end. At its lower end, it is connected by a link 63 to a lever 64 pivoted at 65 and having'a roll 66 engaging a cam 67 on the cam shaft 14. A

spring 68 holds the roll 66 against the cam 67. The parts are so timed that the hook 62 is moved upward as the lay moves forward, and so that it is moved promptly downward as the lay starts its rearward movement, en-

the new weft end W before the time of operation of the cutter 31. By such engagement the weft end W is pulled sharply downward, removing it from the path of the shuttle, and pulling the weft end W free from its clamp 2l on the shuttle box before it is cut at the'selvage, thus removing it entirely from the shuttle box. The cutter 3l thereafter operates, usually at or near back center, and by so doing severs both weft end-s at the selvage. The severed weft end may then be pulled away from the clamping device 25 or lmay be left depending therefrom until the device is released upon the next indication of transfer. In either case, it will not reenter-the cloth or cause damage thereto. Y

Having thus described the details of construction of our improved thread cutting and removing `mechanisnnthe advantages thereof will be readily apparent, and it will be seen that we have severed and disposed of the trailing weft ends, without interfering withV theidle wefts of the inactive shuttles, and that we have eectively prevented the drawing-in of the severed weftends into the cloth to cause defects therein. f

Having thus described our invention and the advantages thereof, we do not wish to be limited to the details herein disclosed otherf wise than as set forth in the claims, but what we do claim is l. In a weft replenishing loom, a breast beam, a thread cutter mounted thereon above the plane of the cloth, a lay, means mounted on said lay effective to raise the trailing weft ends of the ejected weft carrier and the newly inserted weft carrier to said thread cutter upon the first forward movement of the lay after weft replenishment, and means to actuate said thread cutter.

2. In a weft replenishing loom, a breastbeam, a thread cutter mounted thereon above the plane of the cloth, a lay, a. device mounted ,on said lay effective to raise the trailing weft end of the ejected weft carrier to said thread cutt-er upon the first forward movement of the lay after weft replenishment, said weft being normally below the path of movement of said device, a thread cutting and clamping .mechanism positioned adjacent the mouth of the shuttle box and effective to raise the weft end of the ejected weft carrier into the path of movement of said weft raising device between the weft replenishing beat-up of the lay and the next succeeding beat-up thereof, and means to actuate said thread cutter upon the next subsequent rearward movement of the lay.

8. In a weft replenishing loom, a breastbeam, a thread cutter mounted thereon above the plane of the cloth, a lay, and means mounted on said lay having a definite portion adapted to engage and present the weft end of the ejected weft carrier to said thread cutter and having another 'definite portion adapted to engage and present the weft end of the newly inserted weft carrier to said thread cutter as the lay moves forward, and

means to thereafter operate saidthread cut-l ter as the lay moves rearward.

4. In a weft replenishing loom having a loom frame, and a lay with a shuttle race and shuttle boxes thereon, in combination, a thread cutter mounted on said frame, means positioned laterally of the loom adjacent the mouth of the shuttle box in which transfer takes place, eifectivevto hold both the outgoing and incoming weft endselevated above the shuttlevrace on the lay, and means mounted on the lay effective to engage said elevated weft ends and raise said ends higher for presentation to said thread cutter at the beatup next succeeding weft replenishment.

5. In a weft replenishing loom, a thread cutter adjacent the cloth selvage, a clamp on 'the shuttle box at the outer end thereof for 'end downward and out of said clamp by direct downward movement of said device before substantial rearward movement of the lay and before actuation of said thread cutter to sever said weft end. v

In testimony whereof we have hereunto aiiixed our signatures.

ALBERT A. GORDON. ALFRED r. MoRRRLL.

Images