US1648011A - Harness motion for looms - Google Patents

Description

Nov. 8, 1927. R. J. BARTHOLOMEW HARNESS MOTION FOR LOOMS Filed Sept. 24. 1925 2 Sheets-Sheet l INVENTOR mg m ATTORNEYS Nov. 8, 1927. r 1548,01

R. J. BARTHOLOMEW HARNESS MOTION FOR LOOMS Tiled Sept. 24, 1925 2 Sheets-Sheet 2 v INVENTOR BY ma M /W- A'ITORNEYB,

Patented Nov. 8, 1927.

UNITED sres ROBERT J. BARTHOLOMEVI, OF LANSIJALE, PENNSYLVANIA, ASSIGNOR TO FLETCHER XVORKS, INCORPORATED, OF PHILADELPHIA,

PENNSYLVANIA.

than

nannnss vrorron non Looms.

Application filed September 24, 1925. Serial No. 58,234.

My invention relates to an improvement in looms, being particularly directed to an improved harness motion therefor.

One of the objects of my invention is the provision of a harness motion so constituted and arranged. as to greatly simplify the changing of the operation of the harness for the weaving of diil'erent designs of fabrics. v

Another object of my invention is the pro vision of a harness motion in which the sclective element thereof drives the cam which operates the harness directly as distinguished from merely setting certain mechanism in position whereby the harness will be operated.

A still further object of my-invention 15 the provision of an improved locking mechanism for each cam so constructed that each cam is held in locked position until the instant the cam is to be advanced.

A still further object of my invention is the provision of an improved harness motion for looms wherein each cam constituting a part thereof has its individual drive, as distinguished from the cams being fastened to each other and driven as a unit, and wherein the driving mechanism for the cams may be readily changed to effect a change in the harness motion.

In order that my invention may be clearly understood, I may state that the motions which my selective harness motion is designed to replace consist of a plurality of cams bolted together and all rotating together as a unit, and other harness motions known to the trade, such as dobby, side jacquard machine and geared head motion, etc. Assuming that in such a motion the harness is changed for each pick, one up one down, one up one down, etc, to change such a motion to two up two down, two uptwo down, etc, for example, would necessitate the sub-- stitution of entirely different cams, and to change this motion to seven up one down, for example, would necessitate the substitution of still another cam.

By my improved arrangement, however, in which each cam is driven independently by a driving chain of improved construction, to change the harness motion requires will not be described further in detail.

Each ack carries a roller 3, riding in a cam track l provided in the face of each cam 5. The cams .5 are mounted for independent rotation on a shaft 6 carried in bearings 7. The periphery of each cam is provided with teeth 8.

Mounted in any convenient location adjacent the cams 5 is a shaft 9 vcarrying idler sprockets 10, the number of idler sprockets depending upon the number of cams, there being a sprocket to correspond to eachcam. Disposed below the idler shaft 9 is a shaft 11 on which are mounted a series of drive sprockets 12, corresponding in numher to the idler sprockets 10. Adjacent one end of the shaft 11 is a bevel gear 13, in mesh constantly with a bevelled gear 14 carried atone end Of'tllQ- drive shaft 15.

Carried by each pair of idler sprockets 10 and drive sprockets 12 is a sprocket chain '16, provided at intervals as will be pointed out later in more detail, with laterally eX- tending teeth 17 adapted at the, proper time .to engage with the teeth 8 in the cams to cause the cams to be rotated independently and selectively for a distance dependingupon the motion desired;

Extending across the loom just above the peripheries of the cams 5 is a shaft 18 carrying a series of locking devices or pawls 19 pivoted thereon, the end 20 of each pawl engaging the teeth 8 on the periphery of each cam, as shown in Fig. 1, to hold the cam against movement, while the other end 21 of PENNSYLVANIA, A CORPORATION OF I driving chains.

these pawls offset to the left with respect to the chains 16, as shown in Fig. :2 is adapted to be engaged by the driving teeth 17 at the proper instant to lift the pawl out of locking position to free the cams.

The operation of my. improved structure is extremely simple. As the drive shaft 15 is rotated the drive gears 12 will be driven to drive the sprocket chains 16. As each chain reaches a position where the teeth 17 carried thereby are about to engage the teeth 8 on the face of each cam, the teeth will first of all engage the inner end 21 of each locking pawl 19 gradually lifting the same out of the locking position of Fig. 1 to the unlocked position of Fig. 3, at which time the first tooth 17 of the chains will engage a tooth 8 of the cams to thereafter cause the cam to be rotated for a distance depending upon the number of driving teeth on the chain, which in turn will depend upon the motion to be imparted to the harness. The cams as illustrated are eight time cams, that is to say each cam makes one complete revolution in eight picks of the loom. These par ticular cams illustrated happen to change the harness for each pick, one up one down, one up one down, and so on. Any combination desired, however, may be obtained by merely changing the number or location or both of the driving teeth 17 carried by the This is of course a great advantage over the usual cam motion in which the cams are bolted together and rotate as a unit, as distinguished from my structure in which each cam is rotated or driven individually. In my selective harness motion if one harness is to stay up for seven picks for example, the cam controlling this harness will be locked in stationary position automatically with the cam roller on the high point for seven picks and will then be turned on the next pick so that the harness is dropped, and will then be turned again for the following pick so that the harness is raised, in which position it will remain for the next six picks.

It will be seen therefore from the foregoing that I have provided an improved harness motion for looms in which the selective element of the motion drives the cams direct, and in which any combination of harness motions may be easily obtained.

I have not stressed the particular con- 'struction of driving chain employed, inas- It is to be understood also that the construction of the locking mechanism as well as the other parts of my structure, may be varied from that illustrated without departing from the spirit and scope of the invention.

lVhat I claim is 1. In a harness motion for looms, a plurality of cams, driving mechanism for each cam, said driving mechanism being operable during a part of its travel to intermittently drive the cam, and means controlled by each of said driving mechanisms for effecting in dividual and automatic prcdetcrn'iincd locking of the cams throughout the idle travel of the driving mechanism.

2. In a harness motion for looms, a plurality of cams. an individual selective drive operable throughout part of its motion to drive each cam, and cam locking mechanism for each cam, and individually controlled a plurality of individually rotatable cams carried by said shaft, a sprocket drive chain ing mechanism.

3. In a harness motion for looms, a shaft, a plurality of individually rotatable cams carried by said shaft, a sprocket drive chain for each cam, adjustable teeth carried by each chain for effecting individual and selective drive of each cam throughout a part of the travel of the chain, and a locking pawl for each cam individually controlled by the driving teeth of each chain to lock the cam against motion throughout the remaining travel of the chain.

1. In a harness motion for looms, a shaft, a plurality of individual rotatable cams carried by said shaft, a shaft adjacent the faces of said cams, a sprocket fixed to said shaft, a drive shaft for driving said sprocket, a plurality of idler sprockets, a drive chain for each cam carried by said idler sprockets and driven by the sprocket first n'ientioncd. sets of drive teeth projecting from each of said chains, said teeth being mounted for adjustment in said chains, gear teeth on the peripheriesof said cams and adapted to be engaged at predetermined intervals by said drive teeth, and a locking pawl for each of said cams controlled by said drive teeth for locking said cams.

5. In a harness motion for looms, jacks, cams for individually and directly driving said jacks, and directly connected thereto, and selective elements for driving each cam whereby the harness is directly operated.

This specification signed this 22d day of September, 1925.

ROBERT J. BARTHOLOMEIV.

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