US129718A - Improvement in heddle-actuating mechanisms - Google Patents

Description

` Y l -3Shetas-'Sheet'1.v l. CRAWSHAW. Y

lmprdvement if: Heddle ctuaing Mechanism.

N0. 129,718.- 4 Patented Jqly 23, 1872.

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Improvement in Heddl Actuating Mechanism.

129,718. i Patentedjuy23,18'72.

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NITEDSTATES" PATENT QFFIGE.

a `JOHN cnAwsHAw, or concime, I"criminal IMPROVEMENT IN HEDDLE-ACTUATING'MECHANISMS.

7 Specification forming part of' Letters Patent No. 129,718, dated July 23, 1872. A

Specification describing a new and useful Improvement in Looms, invented by'JOHN GRAWSHAW, of Cobourg,in the Province Vof Ontario and Dominion of Canada.

This invention has for its object to simplify the mechanism forproducing the harness-motion in fancy and other looms. y The invention consists `chiefly in the use of vibrating bell-` cranks on a sliding frame, the cranks serving to vibrate the jacks, whereby the harnessis raised and lowered. The harness is, by this arrangement, raised and-lowered at one motion,where hitherto two have been usually required. `The invention also. consists inother improvements regarding the cam which turns the chain, the levers which reset the jacksA and lower the harness after each stroke, and other details, as hereinafter more fully described.

a tail side view of the resetting-levers and their connection.

i Similar letters of reference indicate corresponding parts. A in the drawing represents the frame ofthe 1oom, on which the warp-drum, the windingup drum, the battcn, reed, tension, and shuttle devices are arranged, applied, and constructed in suitable manner. B is the shaft, whereby the harness mechanism receives its motion.

This shaft hangs transversely in the frame A,

and receives rotary motion by suitable connection. The heddles C (l are suspended from cords' a`a,`which pass over friction-rollers bib', and are attached tothe upper ends of v levers or jacks D D. These said jacks are hung side by side on a pin,d, which `is supported horizontally at the side of the frame A. There is one jack, D, for every heddle, G. When the upper end of a jack, D, is swung away from the loom the heddle connected with it is thereby drawn up. The lower part of each heddle is, by a cord, e, which passes over a friction roller or rollers, f, connected with the lower end of one of alower set of jacks, E E. These latter are hungkside bysideto a pin, g, which i is `supported. horizontally at the side of the loom. Itmaybe observed thatthe upper ends of lthe jacks E are directly beneath and close to the lower ends of the jacks D, and further that the two jacks D E, which pertain to each4 single heddle, are in line with each other ver-y tically. It is evident that a heddle will be drawn down whenever the lower end of, the jack E with which` it is connected is swung away from the loom. The requisite motion is imparted to the'several jacks D E by means of elbow-levers or bell-cranksF F, which han g on a pin, h, that is held in a horizontal sliding frame, G. This frame is moved back and forth by means of a crank-shaft, J, which is revolved i by bevel-wheel connection 'i with the shaft B, the cranks of the shaft J entering forward projections of the frame Gr. The frame G carries also the upper chain-drum H, from which the chain I is suspended in the ordinary manner; The projections of the chain bear, as the drum H is gradually turned in their proper succession, against the vertical arms of the bell-cranks \F, and vibrate these cranks so as to elevate their horizontal arms. In their neutral position the horizontal arms of the bell-cranks are in line with the upper ends of the lower jacks E. When the bellcranks are, however, vibrated by contact withthe chain I the ends of 'their horizontal arms will be raised in line with the lower ends of the upper jacks D. It is evident that one bell-crank, F, is provided for every pair of jacks, D E. Whenever the frame Gr is, by the crank-shaft J, drawn toward the loom, those of its elbow-levers F, which are effected by the chain I, will bear against their respective upper jacks D and vibrate them so as to raise the heddles connected thereto. The remainin gbellcranks will bear against the-upper ends of their respective lower jacks E and draw the heddlesconnected therewith down. On the return move of the frame G- that is to say, when said frame moves away from the loom-the contact of thebell-cranks with the jacks is terminated and the heddles are at liberty to resume their neutral, i. e., middle, po-

sition, which is neither entirelyup nor down. In

order to bring all heddles, on such return stroke .of the frame G, to their middle or neutral position,.two levers,vL L', arepivoted atj l., respectively, to the frame A, one above the other, (see Fig. 4,) and lock together at their contiguous ends by tenon and socket m, as shown. By means of a projecting pin, n, one of these levers, L, is connected with a rod, o, pivoted to an arm or lever, M, which is suspended at its upper end from the frame A. The lower part of the lever M is in contact with a cam, p, which is mountedupon the shaft J The levers L and L carry projecting arms r and s, respectively, behind the upper parts of the jacks D and the lower parts of the jacks E. When the frame G is on its return stroke to clear the jacks from contact with the bell-cranks, as above mentioned, the cam p swings the lever M, and there by also the levers L L', so that the latter will lay their arms r s against the jacks D E, respectively, and thereby swing the jacks baclr to their respective neutral positions, and draw the heddles all into line with each other-z'. e., so that they areneither entirely up nor down. The jacks are then in position for the next contact with the bell-cranks, which are chan ged by the chain during the return move of the frame G, or at the end of the return move, while the bell-cranks are not in contact with the jacks. Thus it will be seen that one rotation of the crank-shaft J, producing a back-'and-forward motion of the frame G and a vibration of the levers L L', will suice to move the heddles in advance of and subsequent to a shuttle movement. The mechanism is very simple and positive in its action, and under complete control. The chain-drum H receives its intermittent rotary motion by means of a Worm, t, which is attached to a sleeve, u, embracing a shaft, N. This shaft N, hanging in bearings that project from the frame G, moves back and forth with the latter, and slides meanwhile through the gear-wheel o, which gives it rotary motion. The gear-wheel o matches into another toothed wheel, w, on the shaft B, and is, by feather and groove, connected with the shaft N to rcvolve the same during the reciprocating motion of the frame G. The worm t enters a notched disk, which is mounted upon the end of the drum H, and turns the dislr and drum by passing gradually from notchto notch, one revolution of the shaft N producing` one change of notch to notch, and a consequent partial turn of the chain. The sleeve u is, by a spring, (not shown,) held with a notch in its end against a pin, y, which projects from the shaft N, as shown in Fig. 3. When from any one cause the drum H docs not turn with proper ease, so that its attempt to remain at rest will overcome the power of the concealed spring, the shaft N will carry its pin .y out of the notch in the sleeve, crowding the sleeve back against the spring, and will revolve without affecting the position of the spring. The drum H will, in that case, not be turned.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. The bell-cranks F F, hung in the reciprocating frame G to actuate the jacks D E and theloom-harncss, substantially as herein shown and described.

2. The interlocking vibrating levers L L',

provided with the projecting arms 1^ and s tol return the jacks D E and the heddles to their neutral position, arranged and operated as specified.

3. The crank-shaft J, combined with the reciprocating frame G and with the levers L L to actuate them, substantially as herein shown and described. I

4. The rotary reciprocating shaft N for carrying the adjustable sleeve u for turning the chain-drum, and the pin y for locking said sleeve, substantially as herein shown and lescribed.

JOHN CRAVVSHAN.

Witnesses:

GEORGE LEY, W. A GRAHAM.

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