US1595265A - Friction let-off for looms - Google Patents

Description

Aug. 1o 1926.

1,595,265 R. G. TURNER 1 FRICTION LET-OFF FOR LOOMS Filed March 19, 1925 Patented aug. 1o, 1926.

*UNITE STATES PTET OFFICE.

EICHARD GREllill'fl'aEAll@1 TURNER, OF WORCESTER, llfIlfiSACH'USE'FJJS,v ASSTGNOR TO CROMPTON t KNOW'LES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A COR- PORATION OF MASSACHUSETTS.

FRICTION LET-OFF FOR LOOMS.

Application led March r19, 1925. Serial' No. 16,800.

tout all the picks between the fell and the p defective pick. After these picks have been removed it is necessary to move the cloth backwardly in the lloom until the fell is in line with the reed before weaving `is resumed. It is highly desirable that the ywarp tension be the same after the pickout as it was before so that a mark will not appear on the cloth. The weaver usually releases the friction and turns the beam back by hand but with such a method there is never any assurance that the warp tension will be proper. It is also necessary to be able to release. the tension of the warp so n that the clothfcan be moved forwardly, as

which will appear as the description proceeds, my invention resides in the combination and arrangement of parts hereinafter described and set forth in the claims.

1n the accompanying drawings wherein I have shown one form of my invention,

Fig. 1 is an end elevation of a loom-hav.

'ing myV invention applied thereto,

Fig. 2 is a vertical sectijon on line 2-2 of i VFig. 1, and

Fig. 3 is an enlarged vertical section on line 3 3 of 2.

Referring more particularly to the drawingsfit .will beseenA that I have Vprovided a loomifframe 'having the :usual crank shaft 11,' connector 12,V and lay 13. The

Vrea-rpart' of the/'frame is provided with.

^ pockets. le which. receive the -gudgeons of `b e'aiiu lSecured to the lwarp beam and concentric with the gudgeons 15 are gears 16 by means of which the beam may be turned either in a forward or a backward direction.

Spaced vfrom the beam lV is a shaft 17 kmounted on supports 18 having secured thereto near one end thereof a worm gear 19 having an internal friction Yface 20. A worm 21 is secured 4to a forwardly extending shaft 22 and meshes with the worm gear 19. Y The ends of said shaft 22 are received by bearings 23 and the forward end thereof is provided with a hand wheel 2e by means of which said worm 21 may be turned in either direction.

Loosely mounted on each end'of shaft 17 is a spider 25 having a pinion 26 cast integral therewith to mesh with the adjacent gear 16 and provided with a plate 27. Slots 28 are cast in each plate 27 to receive bolts 29, said bolts extending freely through the slots 23 and being held in position by nuts 30. Said bolts extend through wings 31 which are formed on friction sectors 32 andv 33, respectively, one pair of sectors being located on each side of the loom. SaidV sectors are hinged together as at 34 and are provided with inwardly extending fingers 35 and 36, respectively, the nger 36 receiving a set screw 37 which presses against the finger 35 to expand thel sectors, each of which has a leather facing38..

The gear 19 has a hub 39 which is keyed as at 10 tothe shaft 17 and a drum 411 is secured to that end of the shaft 17 opposite the worm gear 19 by a key d2.- One. pair of sectors cooperates with face 20 of gear 19- and the other pair cooperates with face 43 of drum 41. Collars 44; prevent end motion of `the gear 19 and drum 11.

YThe operation of my improved let-off will be apparent to those skilled in the art.v During normal weaving the worm 21 will prevent rotation of the worm gear 1 9, shaft 17, and drum 11, andas the beam W and gear 16 continue to rotate the pinions 26 will be rotated to cause relative frictional movement between the leather facings .38 and the faces .120 'and 43, respectively. The

`.extent of the. friction. and therefore the out, the-weaverwll remove-the picks untilk F il the defective pick is reached, which will leave the fell of the cloth forward of the reed when the latter is on front center. VJhen the picking out operation is completed the lay will be moved to forward position and the hand wheel 24 rotated so as to cause a backward or clockwise rotation of the beam V7 as viewed in Fig. l to move the fell of the cloth back to the reed. 'lfhe hand wheel 24: can be turned a short `distance after the fell has reached the reed without putting undue tension on the warp threads inasmuch as the only pressure brought to bear upon the warp beam is thatwhich can be transmitted through the friction, and this is the same friction which resists forward movement of the beam. The warp threads will therefore be restored to their original tension and weaving may be resumed without leaving a mark in ,the cloth.

If for any reason it is necessary to move the cloth forwardly in the loom this result can be accomplished by turning hand wheel 24 in the opposite direction. ln so doing the warp is slaclrened without releasing t-he friction or its adjustment. The worm acts as a stop to hold the worm gear in any position.

From the foregoing it will be seen that l have provided a very simple friction let-off for looms so arranged as to permit the beam to be reversed without putting the warp threads under undue tension, because of the fact that the reverse movement is accomplished by reversing the friction which normally resists forward movement of the beam and this friction is the same whether the beam be turning forwardly or rearwardly and is not changed in any way during the picking` out operation.

Having thus described my invention it will be apparent that changes and modications may be made therein by those skilled in the art without departing from the spirit and scope of the invention, and l do not wish to be limited to the details her-ein disclosed, but what I claim is:

l. In a let-off mechanism for looms, a warp supply, a friction member movable with the supply as the latter supplies the demand of the loom for warp, a second friction member to cooperate with and resist the movement lof the first named friction member and warp supply, and a reversing device connected to the second named friction member, said device effective to hold said second named friction member in fixed position during the normal running of the loom and being effective to turn the second named friction member backwardly to reverse the direction of movement of the first named friction member and the warp supplyV connected thereto. l

2. In a let-off mechanism for' looms, a

warp supply, a friction member movable with the supply as the latter supplies the demand of the loom for warp, a second friction member to cooperate with and resist the movement of the first named friction member and warp supply, and a reversing device connected to the second named friction member in fixed position during the normal running of the loom and being effective to turn the'second named friction mem-- ber baclrwardly to reverseV the direction of movement of the first named friction member and the warp supply connected thereto while the same frictional contact is preserved between the members as exists under normal running conditions.

3. In a let-off mechanism for looms, a warp supply, a friction member movable therewith as the supply moves to furnish the warp required by the operation of the loom, a second friction member normally contacting with the first friction member, and a reversing device effective under normal conditions to hold the second named member in fixed position to cause the same to resist normal forward movement of the first named friction member and the warp supply, said reversing device being effective also to turn the second named member backwardly and by means of the normal friction existing between the members to thereby cause reverse movement of the first named friction Vmember and the warp supply coniected thereto. Y

4L. ln a let-off mechanism for looms, a warp supply, a friction member movable therewith as the supply moves to furnish the warp required by the operation of the loom, a secondY friction member' normally contacting with the first friction member, and a reversing device effective under normal conditions to hold the second named member in fined position to cause the same to resist normal forward movement of the first named friction member and the warp supply, said reversing` device being effective also to turn the second named member backwardly and by means of the normal friction exist-ing between the members to thereby cause reverse movement of the first named friction member and the warp supply connected thereto, said device including a worm gear rigid with respect to the second named vfriction member and a worm cooperating with Ysaid worm gear and normally held in fixed longitudinal position. A

5. In. a let-off mechanism for'looms. a warp supply, a gear movable with the first named gear, a friction element movable with the second named gear and comprising a substantially closed ring adjustable askto diameter, a second friction member cooperating withl the first named member to resist movement-thereofand'the gears and warp supply, a worm gear fixedwith respect to the second named friction member, and a Worm cooperating with the Worm gear to hold the latter in fixed position under normel conditions and efeetve to move seid worm gear baokwardly to reverse the direction of movement of the first named frieton member and the Warp supply, the normal frietional Contact between the members being maintained during the reversing' movement.

In testimony whereof I have hereunto aiixed my signature. f

RICHARD GREENLEAF TURNER.

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