US1971515A - Attachment for loom let-off mechanisms - Google Patents

Description

Aug. 28, 1934. R. B. TRANSUE v ATTACHMENT FOR L OOM LET-OFF MECHANISM Filed May 9. 1932 INVENTOR.

ATTORNEY.

Patented Aug. 28, 1934 ATTACHMENT For: Loon r LET-OFF MECHANISMS "Rogers B. Transue, C hambersburg, Pa. 7 Application my 9, [1932, Serial No. 610,053 f '1 Claim. (01. 188.33)

My invention relates to attachments for loom let-off mechanisms.

Loom let-off mechanisms and used in the cloth weavingindustry are for the purpose of exerting a constant and even ten sion on the warp beams from which the threads are drawn and comprise an assembly of gears together with a weight so arranged that the necessary tension will be exerted on the threads as aforesaid. After some use, however, there is a tendency of the gears to wear so that the warp beam may over run more or less independently of the let-01f mechanism causing a bad mark in the cloth being woven.

It is the main object of my invention to provide a device which may be readily attached to a letoff mechanism after it has become worn without alteration thereof and which may then be as readily adjusted to provide the necessary frictional grip on one of the gear shafts so that said gear and the let-off mechanism may be prevented from the over-running described above.

Another object is to provide an attachment for this purpose in a simple, inexpensive and eficient form.

The foregoing and other objects together with means whereby the same may be carried into effect will best be understood from the following description of a preferred embodiment of my invention taken in connection with the accompanying drawing wherein:

Figure 1 is a side elevation-partly broken away, of a conventional form of let-oif mechanism showing my invention applied thereto.

Figure 2 is an enlarged side elevation partly broken away and in section, showing my inven tion alone.

Figures 3, 4 and 5 are plan views of the friction washer, adjusting washer, and collar respectively which constitute the working parts of my invention.

Referring now with more particularity to the drawing Figure 1 illustrates a let-off mechanism of the type covered by Patent Number 1,803,143

.lissued April 28, 1931 to Oscar V. Payne and my invention is shown as applied to this mechanism though it is understood that it may be applied when possible and desirable to all other types of mechanisms.

In the structure shown the reference character A designates a shaft which is extended from the warp beam B over which the warp threads T pass forward to the usual lease rods and harnesses (not shown) of the loom (also not shown).

. worm gear C is attached to and rotates with as commonly knownthe shaft A and turns within a housing D which is normally pulled in a counterclockwise direction as viewed in Figure 1 by the weight E. A worm F meshing with the worm gear C and fixed on aishaft G journaled inthe housing D in effect acts to lock the housing on the worm gear and to the warp beam B so that the clockwise movement or strain on the warp beam as the threads T are drawn off acts to raise the weight E. A tension or strain is thus exerted on the warp threads by the weight which is of course selected to provide the proper warp tension. Additional mechanism is provided to cause a periodic rotation of the worm F in order that the worm gear C may rotate as the warp threads are drawn off while at the same time the housing D will be held by the threads in such position that the weight E is pulled upward and exerts the desired tension on the threads.

After some use the worm gear C and worm F become worn and the constant strain imposed by the weight E on these gears will cause the worm gear to slip or turn backward in a counter-clockwise direction at times resulting in a decrease or loss of the tension exerted by this weight on the warp threads and causing a bad mark in the cloth being woven. It is to prevent this action that my invention is used.

My invention comprises a friction washer l of fibre or other suitable material and having an inner diameter such that it may slip freely over the lower extended end of the shaft G. A pressure washer 2 of similar size and dimensions but formed of metal is provided and has in one face three, more or less, equally spaced sockets or depressions 3. A collar 4 also of metal and having a bore 5 suitable to fit the shaft G is provided and is of such thickness that threaded sockets 6 may be extended radially inward from its outer periphery into the bore 5 to receive set screws '7 having head sockets 8 by means of which. they may be adjusted by a tightening tool (not shown) Pressure screws 10 are threaded through bores 11 in the collar 4 at equally spaced points and in parallelism with the axis of the bore 5 and have their ends 12 rounded off to enter the depressions 3 in the pressure washer 2. The opposite ends of the screws 10 have screw driver kerfs 13 and lock nuts 14 are mounted on these ends to lock the screws in an adjusted position. It is understood that any number of set screws '7 or pressure screws 10 may be employed and of course that the depressions 3 in the pressure washer 2 will be provided in number and position to suit. In use the frictionwasher 1 is slipped over the lower end of the shaft G and up against the lower edge of the housing D and the pressure washer 2 is placed up against this washer 1 with its face bearing the depressions 3 turned downwardly. The collar 4 is then placed over the shaft G and locked in place by the set screws '7 and the pressure screws 10 engaged with the depressions 3 and turned to exert a pressure on the pressure Washer. This of course presses the friction washer 1 tightly between washer 2 and the lower edge of the housing D and restrains the shaft G against over-running or other undesired movement under the pull exerted by the weight E as aforesaid by virtue of the frictional contact and engagement between the washers and housing. The necessary pressure to prevent loss of tension on the warp threads T having been secured by this means the lock nuts 14 are of course tightened. Continuous and convenient adjustment for wear is provided by the pressure screws 10 to com pensate both for wear in the gears C and F and the friction washer 1.

Obviously my attachment may be used in similar manner on other mechanisms wherever their construction permits and will in any case provide an efficient and convenient means for maintaining the mechanism in its proper operating condition.

While I have herein set forth a certain preferred embodiment of my invention it is understood that I may vary from the same in details so as best to construct a practical device for the purposes intended, not departing from the spirit of the invention and within the scope of the appended claim.

I claim:

In a device of the kind described, the combination with a loom let-01f mechanism, a housing and a worm shaft extended from the housing of a fibre friction washer mounted on the shaft next to the housing, a metal pressure washer mounted on the shaft next to the friction washer and having depressions in its face remote from the housing, a collar mounted on the worm shaft and spaced outwardly from the pressure washer, set screws extended radially inward through the collar against the shaft to lock the collar to the shaft, and pressure screws threaded through the collar parallel with the shaft and extended at their ends into the said depressions in the pressure washer.

ROGERS B. TRANSUE.

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