US127318A - Improvement in looms for weaving slat-blinds - Google Patents

Description

{f 2 Sheets- Sheet I. J. L. DEVOL.

Improvement in Looms for Weaving Slat-Blinds.

No. 127,318, r P'atente dMay 28,1872.

' [mi/e12 for 2 Sheets-Sheet 2 Improvement in Looms for Weaving SlabBlinds. N0, 127,318, Patented May 28.l87-2.,

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- to one another in the ordinary manner.

- batten B oscillates the rock-shaft 0 by means IUNNI'IED STATES PATENT Orrrcn.

IMPROVEMENT IN LOOMS FOR WEAVING SLAT-BLINDS.

Specification formingpart of Letters Patent N 0. 127,318, dated May 28, 1872.

Specification describing certain Improvements in Looms, invented by JONATHAN L. DEVOL, of Parkersburg, in the county of Wood and State of West Virginia.

This invention relates to looms which are more especially designed for weaving windowshades and such like articles, the woof of which is composed of splints of wood. My improvement consists, first, in such an arrangement of the take-up mechanism that the weighted levers which rotate the cloth-beam intermittingly shall be released for action very soon after the batten begins to be oscillated forward to drive up the splint, so that the warpthreads will be kept taut and close upon the splint, preventing its displacement; secondly, in a novel mechanism for giving motion to the trea- 'dle which operates the heddle-frames; thirdly, in the employment of a spring by the torsion of which the heddle-frames are prevented from moving upon each other except when operated by the treadle; fourth, in an improved mechanism for operating the dart which draws the splints through the shed.

Figure lrepresents a side elevation of a loom embodying my improvements. Fig. 2 is a plan view drawn on a smaller scale than Fig. 1. Fig. 3 is a front elevation. Fig. 4 is a rear elevation; and Fig. 5 is a rear elevation of the heddle-frames detached,'both Figs. 4 and 5 being drawn on the same scale as Fig. 2.

The same letters of reference are employed in all the figures in the designation of identical parts.

The various parts of the loom are supported upon a suitable frame-work, A A, and the principal members of the machine are all of wellknown construction, and arranged in relaai on of connecting-rods B B, which take hold of arms or cranks on the rock-shaft. The latter is constructed with a cam, O, which is recessed in its upper edge, and operates upon a swell on the lever or pedal D, which is pivoted at d in such a manner that it may have a slight lateral motion. The free end of thelever extends forward under the downwardly-projecting bars E E of the heddle-frames E E, which are alternately pushed up by the up strokes of the lever. The heddle-frames are suspended E with the cam-slot,

for trimming the from a roller overhead, and their bars are connected together by a belt which reeves over a pulley, E arranged beneath the lever B. A portion of the lower end of each bar E is cut away, so that the lever may play freely in the space in one, While it operates upon the foot 6 of the other. These feet e of the bars are of increasing width toward their lower termination, where each extends across the lever on the completion of each movement of the heddle-frames, so that it becomes necessary to give to the bars a slight lateral motion while beingmoved vertically, in order that the foot of the descending bar may clear the ascendin g lever. This lateral motion is obtained by a cam-slot, 0 in one of the bars, operating upon a fixed stud, 0 on the other. In descending, the lever slides along the oblique side of the foot 6; therefrom it is immediately pushed laterally and under such foot by the inclined side of the recess in the cam C. To prevent the heddleframes from moving up and down except when operated upon by the lever D, a spring, E is fastened to the stud 0 and firmly held near the other end between studs 0 e on the bar as best seen in Fig. 5. The cloth as fast as woven is taken up by the cloth-beam F, which, for this purpose, is intermittingly rotated by means of weighted levers G G pivoted to the frame, and provided with pawls g g, which act upon the ratchetwheels F F on the ends of the cloth-beam. Other pawls, g g, are used to hold what has been taken up in the ordinary manner. At each back stroke of the batten the weighted leversG are raised to cause their pawls to advance upon the ratchet-wheels of the clothbeam by oscillating cams H H, which are pivoted to the batten and oscillated from the arms or cranks on the rock-shaft O by rods H H. The motions of the oscillating cams H in relation to the batten and the heddlle-fram es are such that they will escape from under the levers soon after the batten begins to be thrown forward, and at the moment when the lever D begins to act upon the heddleframes to change the shed, so that the warp-threads will be constantly kept taut. The woven fabric is drawn over a cross-beam, I, to which the shears K K,

ends of the splints, are sebut the moment it escapes.

cured. The upper blade of each shear is stationary, with its cutting-edge, which is presented downward, a little distance above the upper surface of the cross-beam I, so that the splints can pass under it. The movable shearblade of each shear is operated from the batten by means of connecting-rods K, the operation being such that the blades open on the forward stroke of the batten to receive the splint which is being driven up, and close on the back stroke to trim off the ends of the splint. The prepared splints are fed to the machine through the guide-piece L, and are drawn through the shed by the dart M, which is constructedwith spring-nippers M for grasping the end of the splint. The dart slides in i the race N, which is fastened to the batten or reed at the proper point, and is operated by a cord, m, which is fastened to it at one end first, and, after being wound once or twice around a pulley, 0, directly overhead, is passed on and tied to its other end. Upon the face of the pulley O is a smaller pulley, O, which is connected by a belt with the driving-pulley P, mounted upon a shaft in the center of the batten. The shaft of the pulley P carries a handle, P, which serves the double purpose of a hand-piece for oscillating the batten, and of a crank for turning the driving-pulley to throw the dart back and forth through the shed. The friction of the cords r on the yarnroll R is regulated by shifting the weights r on the levers R, 'to which the brake-cords are tied near the fulcrums.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination, with the ratchets F on the cloth-beam F, of the weighted lever G and oscillating cams H, arranged and operating substantially as specified.

2. The combination of the oscillating batten B, connecting-rods B B, rock-shaft G 0, le-

ver D, and bars E e of the heddle-frames E,

which are connected together by a fixed stud, e moving in a cam-slot, 6 all the parts being arranged to operate in the manner set forth.

3. The combination of the spring E fastened to the studs 6 with the studs 6 e, between which it extends, substantially as and for the purpose set forth.

4. The combination of the dart M, cord m, pulleys O O, driving-pulley P, and handle P all carried by the batten, and operating substantially in the manner set forth.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' J. L. DEVOL.

Witnesses:

A. RUPPERT, y B. EDW. J. EILS.

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