US369565A

US369565A - Island

Info

Publication number: US369565A
Authority: US
Publication date: 1887-09-06
Anticipated expiration: 1904-09-06

Description

(No Model.)

G. W. STAFFORD.

COMPART BUARD FOR JAGQUARD LooMs.

. No. 669,666. Patented. sept. 6, 1687.

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SPECIFICATION forming part of Letters Patent No. 369,565, dated September 6i, 1887.

Application filed December 2T, 1886. Serial No. 222.574. (No model.)

To all whom. it may concern:

Be it known that I, GEORGE W. STAFFORD, of Providence, inthe county of Providence and State of Rhode Island, have invented certain new and useful Improvements in Oompart-Boards for Jacquard Looms; and I do hereby declarethat the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, and to the letters of reference marked thereon7 which form a part of this specification. Y

This invention relates to the compartboards,77 so called, used in connection with the Jacquard devices for operating harnesses in looms for the purpose of dividing and properly arranging the harness-cords with relation to the warp-threads in the loom.

These boards have been heretofore usually constructed of wood, plain boards of this material being perforated with holes arranged in short rows across the board, the distance between the rows being such that each row will come over a certain number of the warpthreads in the loom, and each alternate row being bored a little back, so that the holes in the rows are opposite to the spaces in the rows on cach side of them.

The main objection to the wooden boards is that the harness-cords that pass through them by their continual motion back and forth cut into the sides of the holes, especially those cords near the ends of the boards where the harness-eords leave the board at an angle in the direction of the Jacquard mechanism above. The friction of the grain of the wood also frets and wears away the cords, lengthening those toward the ends, so that they become loose and rebound in moving up and down with a liability to produce an irregular motion of the warpvthreads controlled by them and break the harness-cords where they are attached to the mail-eyes. These defects all go to lessen the speed of the mechanism, and consequently the product of the loom. These objections I overcome by constructing the board of wires so arranged as to leave spaces between them in the same order as the holes are now made in the wooden boards.

Figure 1 shows a top view `of my board.

xo Fig. 2 shows a vertical section of the board,

taken lengthwise through the line x x, Fig. 1. Fig. 3 is a view in horizontal section of a part of my board, taken at the line c c, Fig. 2. Fig. 4 is a top view of the upper part of the same portion, Fig. 2. The section shown in Fig. 2 is enlarged.

a a. are strips of wood or other suitable material, through the sides of which two rows of holes are made to receive two series of wires, o o,which wires extend across from one strip a to the other in a diagonal position, the lower series of wires being inclined to the right and the upper series to the left, or vice versa, so that the two series ofwires in crossing each other diagonally divide the space between the two strips aa into alternating openings corresponding in general arrangement with the holes usually made in the wooden boards.

I have made compart-boards with wires, forming square openings having two sides parallel to the front of the board, but found these objections to them: first, the side of the square opening does not offer a steady guide for the cord to draw in, but allows itto move back and forth as it rises and falls. This difficulty is avoided in the diagonal shape of the opening in the form of compart-board illustrated in the drawings, which forms a corner for the cord to draw into and be guided steadily in its motions7 therebylessening the wear and allowing for an increase in the speed of the loom; second, another objection to the square form is that it is necessary to make' the board twice as wide and with twice as many holes in each row as there are in the diagonal form. This greatly increases .the labor ofthreading the cords in and ofrepairing them, because of the difficulty of getting into the back cords. In opening the shed it is desirable to raise as small a length of the warp-thread as possible, because the greater the length of thread raised the more it is strained. In common cloth-weaving with two heddle-frames the portion of the thread raised to the highest point is very Small; but in the Jacquard loom the warpthread in forming the shed is raised to the highest position both at the front and back of the compart-board, so that the wider the board is the longer will be the portion of the thread between the front and back that is raised to ICO the highest point. By arranging the Wires to form a diamondshaped opening instead of a square one, so as to place the cords alternately in the rows, the Width of the board Will be greatly reduced and the strain on the threads proportionally lessened; also, the time that the` threads are subjected to the action of the cords drawing over them while passing over the compart-board.

The sizes of the wires and also of the spaces left between them can be varied for different sorts of goods.

Having thus described my improvement, What'I claim as my invention is- A compart-board for Jacquard looms7 consisting of a frame with tWo series of wires placed diagonally across it, one of the series being placed diagonally across the other series, substantially as shown, to form the holes for the harnesscords to pass through.A

GEO. W. STAFFORD.

Witnesses:

RUFUs S. MATTEsoN, BENJ. ARNOLD.Y