US96553A - Improvement in jacqttard-mechanism for looms - Google Patents

Description

NPETEES. PHOTO-LITHOGRAPNER, WASHINGTON. C.

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EZEKIEL K. DAVIS, OF NEW YORK, N. `Y., ASSIGrNOlt TO DUCKWORTH @L SONS, Oli'l PITTSFIELD, MASSACHUSETTS.

Letters Patent No. 96,553, dated November 9, 1869.

IMPROVEMENT IN JACQ'UARD-MECHANISM FOR LOOMS.

The Schedule referred to in these Letters Patent and making part of thesame.-

To all whom it may coiwern Be it known that LEZEKIEL K. DAVIS, ofthe city and county of New York, and State of New York,

'have invented certain new and usefulv Improvements in the J acquard-Mechanism of Looms; and Ido hereby declare that the following is a full and correct description thereof, reference being had to the accompanyin g drawings, and to the letters of reference thereon.

My invention relates to mechanism for operating the trap-boards, in connection with an ascending and descending suspension-board; and consists in the arrangement and combination, with the suspension-board and trap-boards, of' two T-levcrs, one on each side of the jacquard, in manner and for the purposes hereinafter more fully described; also, in. operating the card-prism, by means of a combination otl the arm of the T- lever, which operates the suspension-board, and a cam, or bent arm, attached to the rock-shaft, which reciprocates the card-prism.

Figure 1, of the drawings, represents a side elevation of a jacquard, withl my improvements applied thereto.

Figure 2, a plan View of the same.

Letter a represents the frame of the jacquard.

b, the suspension-board.

c c', the two trap-boards.

In this form. of jacquard, the shed is opened froml the middle, by simultaneously raising and loweling the wal-ps, the suspension-board moving downward to lower the warps not trapped by the ascending trapboard; and it is necessary that the suspension-board should not begin to move downward until the ascending trap-board has trapped, and begun to lift the warpthreads selected for it by the pattern-card, when the suspension-board must move down `quickly, to make up for the time thus lost by waiting for the ascending trap-board to secure its warp-threads This combination of motions is produced in a very simple manner by the first part of my said invention, as follows:

Letters d d are two T-levers, one at each side of the jacquard, and both attached to a horizontal rockshaft, e, which rocks .in suitable bearings on the under side of the frame. Y

The T-levers have each two short arms, in line with eachother, connected respectively to the two trapboards, by links ff1 f 2 f 3, in such manner that when the arms are horizontal, the-two trap-boards are in` the same horizontalplane.

The central arms of the T-levers are about twice the length of the two short arms, and are connected to the suspension-board by links h h', in such manner that when the two trap-boards are in the same horizontal plane, the links and arms of the T-levers connected with the suspension-boards are vertically in line with the rock-shaft and point of connection with the suspension-board.

' It follows, from this construction, as will be obvious from an inspection of the drawings, that when the ascending trap-board begins to rise to trap and secure its cords, the suspension-board has noappreciable motion, because its levers and links are in line', and are just moving olii` the centre, while the levers and links operating the trap-boards are at right angles, and are moving at their quickest speed. The speed of the trap-boards gradually diminishes, while that of the suspension-board increases, until the motion is arrested and reversed, and the greater length of the arms of the T-levers, which operate the suspensionboard, causes it to be moved the required distance in time.

. The rock-shaft and T-levers may receive motion from the loom by means of the adjustable arm j, attached to the rock-shaft, and a connecting-rod, k, shown broken ofi', .but to be connected with the loom` as usual'in jacquard looms..

The card-prism rm turns in bearings at the end of horizontal sliding bars m m2, which are connected to the two arms m3 m of a horizontal rock-shaft, n.

This rock-shaft n, which imparts reciprocating movement to the card-prism, is actuated by the upright armkf one of the T-levers, through a bent arm, jp, attached'to the rock-shaft n, which extends across the side frame, and bends up like a cam, to be actuated by the rounded surface of the lower end of the link, which connects the upright arm of the T-lever with the suspension-boarrhas shown in the drawings; or it may be operated by a pin, placed in the upright arm of the T-lever, just below the link-connection.

A spring, g, reacts the bent lever, and keeps it in contact with the actuating-surface of the T-lever.

I claim, as of my invention and improvement in jacquard-mechanism- The T-levers, 1n combination with the suspension# `board and trap-boards, when arranged and constructed so as to produce the mode of operation hereinbefore described.

Also, in combination with the card-prism and its.A reciprocating-meelianism, the bent arm p and the T- Y lever, arranged and constructed to operate in the manner described.

' EZEKIEL- K. DAVIS.-

Witnesses:v z

F. G. TREADWELL, Jr., JOSEPH CAMPBELL.

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