Patent GB-190404661-A (GB)
Title: Improvements in Warp-drawing-in Machines.
Inventor: BROOKES ALFRED GEORGE
Filed: 1904-02-25
Granted: 1904-07-14
Abstract: 4661. Brookes, A. G., [American Warpdrawing Machine Co.]. Feb. 25. Loom healds, threading; reeds, drawing warp threads through.-In warp drawing-in machines of the class described in Specification No. 6348, A.D. 1898, the drawing-in needle carriage is regularly traversed, and the reed, healds, and warp-clamping frame are supported by bearings in which they may be adjusted or moved longitudinally by auto. matically-operated screws &c., to compensate for inequalities in spacing. The carriage A which supports the drawing-in needle a<1> is traversed by means of a feed-screw E, rotated by adjustable spur gearing from the main shaft M, and engaged by a nut e<7> made in two parts which may be separated as shown by means of a handle e<10>, to stop the motion of the carriage. The drawing-in needle a' is reciprocated by toggle-lever mechanism actuated from a crank-wheel, which may, if necessary, be turned by band. The reed R is supported by spring-controlled clasps in a frame of which the upper bar rests upon grooved rollers, so that the frame is free to be adjusted longitudinally by the pressure of the reed-dent opener r<9> upon the splits. The opener r<9> is upon a shaft I<3>, which is rotated by intermittent mechanism each time that a new dent is to be presented for the passage of the drawing in needle. The opener r<9> is withdrawn from the reed, as shown, by mechanism operated by raising the handle e<10>. The handle e'‹ may be raised only when the needle a' is in its backward position, and when it is raised the carriage A may be adjusted, and the reed and warp-filled healds removed. The heald shafts are supported by rods from horizontal bars resting on antifriction rollers mounted on a frame, and the healds are kept under tension by means of weights or springs connected to their lower shafts. The cords of the healds lie in successive convolutions of helical coils of wire inserted into each heald above the eye. Shafts I, I<2> pass through the coils, and have short worms i<1> engaging the convolution of the coils, so that when the shafts are rotated the worms progress through the coils, and engage the heald cords, presenting the eyes in succession for the passage of the drawing-in needle. A tilting arm or flipper i' is supported on a rod i<5> which is rocked by a cam to tilt the flipper against each set of healds alternately. At each movement, the slotted end of the flipper embraces one heald cord below the eye, and holds it securely during the passage of the needle. Ledges serve as bearings for the healds above the eyes when the flipper is pressed against them. A stripper 0 removes each warp thread from the needle after it has been drawn into the heald eye and reed dent. By suitable mechanism, the stripper O is moved in an elliptical path, removing the thread during its quick downward movement, and rising slowly out of the path of the needle. The warp threads are held between pairs of clamping-bars mounting in a frame resting upon antifriction rollers, so that it may be moved longitudinally. The warp-clamp frame is traversed by means of a rack and a worm which is rotated by means of a sharp-toothed pawl biting upon the surface of an annular flange on the worm. The pawl is actuated through adjustable linkwork by a cam projection on the feed-screw E which may be adjusted by means of a handle. The warp-clamp frame may be adjusted by turning the worm by hand through belt gearing. The clamping-bars may be adjusted to alter the slope of the warp threads u. The warp threads are fed in succession to the needle by means of an adjustable screw portion on a shaft S. Between the lower clamping-bars and the shaft S a cranked arm bears against the warp threads, which snap off its end before they arrive at the position to be caught by the drawing-in needle. This snapping tends to separate any two threads which may be stuck together by the sizing-material or from any other cause. The shafts I, P, I<3>, S are driven by suitable gearing including an intermittent wheel having channels engaged at intervals by rollers on a rotating disc. Convex segments on this disc slide over concave segments on the intermitteut wheel, and lock it while the rollers are not engaged in the channels. When the warp threads are to be drawn into more than two sets of healds, additional shafts similar to the shafts I, I' are provided, and the driving-mechanism is caused to act intermittently upon the several shafts. A rotating drum is provided with projecting pins acting on levers which operate clutch devices, and cause the required shafts to be rotated.