Patent GB-190510484-A (GB)
Title: Improvements in and relating to Machines for Uniting Warp Threads.
Inventor: COLMAN HOWARD DARLING
IPC: D03J1/16
Filed: 1905-05-18
Granted: 1906-05-17
Abstract: 10,484. Colman, H. D. May 19, 1904, [date applied for under Patents Act, 1901]. Warp threads, uniting.-The old and the new warps are clamped in two parallel planes, one above the other, the lower set of warps being fixed in position. A carriage carrying the tying-mechanism &c. is fed forwards until the foremost warp in the lower set of warps comes in contact with a sensitive feed-arm. A carriage carrying the clamp for the upper set of warps is moved backwards or forwards till its end warp just comes in contact with another sensitive feedarm. The two warps are then in position to be engaged by two vertical selector needles, which vibrate up and down across the planes of the warps and carry the foremost warp from each set respectively downwards and upwards into two inner planes. Two horizontal plates situated just outside these inner planes then slide forwards, covering these two threads and preventing them from springing back into the outer planes. The threads are then guided into a keyhole opening in a plate, and are held by suction against the ends of two exhaust tubes, while they are tied together, their ends being also cut off and carried away by these tubes. Means are described by which, if only one thread is caught by the selector needles, it is moved back again into its former plane and another trial is made by the selectors, the apparatus Leing stopped after a predetermined number of successive failures. The old or loom warp is, in the first case, held by a supporting- bar, 320, Fig. 36, and clamped in a clamp 321 on standards 318, 319. The new warp is clamped in clamps 20, 28 on a truck 6, 7, which is wheeled to the loom and supports the main carriage. The latter slides along the gib 94 of the bed 7, and carries the tying-in mechanism, and also a driving-motor, fan, and centrifugal waste-collector. The threads between the clamps are then stretched by rotation of a shaft 34 by means of a handle, toggle-lever mechanism &c. 32, 33 causing the ciamp 28 to move outwards. The old warp is them similarly placed in and stretched between the clamps 37, 38 of an upper carriage 41 carried by hooks 76 on rods, fitting through sockets, one of which is fitted with a locking-arrangement but the upper carriage is furnished with wheels which normally run on parts of the main or lower carriage. The upper warp carriage can thus be raised from the lower by means of a handle and special mechanism. The clamp bars 49, 21 have grooves in which ribbons having rough or serrated edges are moved by levers, thus displacing the warps somewhat, so that they readily spring back into position when released. The clamps being adjusted &c., the machine is started, and by belt gearing &c., a shaft 108, Fig. 11, on a pivoted arm 107, Figs. 2 and 11, is rotated, from which by spur gearing 109, 114, &c. the knotting- shaft 121, Fig. 2, and a shaft carrying eccentrics operating blocks 138 &c. are driven. These eccentrics cause two selector-levers 134,135, having bifurcated rear ends, to approach and recede, so that selectors 149, adjustably spring-mounted in a special manner, are caused to move up and down, spearing and engaging the foremost warps from the upper and lower warps, the two threads being freed from their ribbons and moved inwards. Immediately afterwards, the wings 187 of two horizontal separating-blades 183, 184, Fig. 7, carried by a slide 166, Figs. 2 and 11, driven from a crank-pin on the wheel 114, come forward and separate these two warps from the remainder along the whole of their lengths. Forks are placed between and fixed to the two blades, which force the two threads closer together until they ultimately pass into a throatway and keyway of a plate 211 attached to a suction tube 207. At the same time, they are placed between the vertical fingers of an embracer fork 215, Fig. 7, carrying a spring which holds the threads against the far wall of another suction tube 206. The loose ends of the threads are then cut off by a shearing-edge on the sliding plate or blade 183 engaging with a shearing-edge on a plate fixed to the main carriage. The closed end of one of the forks carries the threads under the point of a tying- bill 288 &c. on a bill shaft 226 provided with a sleeve and interior cam and driven from the shaft 121. A cam-cylinder 124, Fig. 27, on the shaft 121 is provided with cam-grooves 125, 126, which, by special mechanism, cause clamping- fingers 248 to move up and down on each side of a thread-hook 249, the thread-hook and fingers being also given a swinging motion about a pin 241. The mechanism for tying the threads is stated to be similar to that described in Specifications No. 2311, A.D. 1903, and No. 18,778, A.D. 1900, [Abridgment Class Sewing &c.]. The tying-bill first makes three-fourths of a revolution, winding the threads under its fingers. Towards the end of this period, the ends of the threads are clamped to the waste tube 20,6, Fig. 7, by a spring finger 259 actuated by a bell crank 260 and a cam 119 on the shaft 112. Then is opened a jaw 232, Fig. 50, which has a shearing and clamping surface, so that the threads are sheared and clamped, the loose ends passing down the suction tube 206. The tying is completed by the clamping-fingers 248 moving upwards and clamping the threads, then swinging outwards to tighten the knot, and finally opening out to free the thread, the clamping-jaw being also released, and the operation of tying requiring two revolutions of the tying-bill. The united threads are then thrust out by a stripper fork 205, Fig. 2. The two warps, in their inward motion, act on latches 264, 265 fixed to the main carriage, and force them out of the path of the reciprocating blades 183, 184, Fig. 7, &c. If one of the selectors fails to engage a warp, the corresponding latch is not moved inwards and remains in the path of one of the blades, thus stopping the motion of the blades and slide 166, the telescopic connecting-rod 172, 173, Fig. 11, collapsing. A latch 174 on the tubular portion 172 engages with a latch 175 on the solid portion, normally causing the connecting-rod to act as if solid. At each revolution of the wheel 114, a pin 278 thereon turns a ratchet-wheel 270 one tooth. The ratchet-wheel, however, has a spring tending to turn it back again, but it is provided with a pawl 275 to prevent this action. When the slide 166 reciprocates, however, a projection thereon acts on this pawl and frees the ratchet-wheel for a moment, so that it may return to its usual position. When the slide is stopped from reciprocating by the latches, the pawl is not freed, and if this should occur consecutively for a number of times, a pin fitting in one of the holes 281 comes in contact with and depresses the arm 128 of a lever 129, so that a notch 131 therein no longer bears against a projection 111 on the arm 107. The latter is then forced out by spring action, and, the pinions 109, 114 being no longer in gear, the tying-in mechanism &c. is stopped. The sensitive feeds for advancing the main carriage carrying the warp-tying mechanism and for moving the upper warp carriage are similar. The former comprises sensitive bell-crank feedlever 313, Fig. 2, shaped so that its horizontal fingers 318 may engage the warp outside the parts where it is held by the ribbons. If the main carriage is in correct position, the foremost warp engaging the fingers 318 causes the arm 314 of the bell-crank lever to be depressed into the path of a semicircular projection 294 on a bell crank 299 &c. carrying a pawl 292, thus limiting the movement of the bell crank, which is rocked by a pin connected to a socket on the arm 135, so that it does not traverse the extent of one tooth, and therefore does not turn a ratchet-wheel 288. If the carriage is not in correct position, the arm 314 remains elevated, so that the pawl 292 can move over the space of one tooth, by which the ratchet 288 and pinion 287 are turned, and the latter, gearing with a fixed rack 27, Fig. 36, is fed forwards till the sensitive feed-lever again engages the foremost of the lower warps. By similar means, the wheel 287<a> is turned when the threads on the upper warp are not in correct position, the rack with which the wheel gears having an oscillatory movement, as the wheel besides turning round also moves bodily forwards with the main carriage on which it is carried. All the warp threads having been tied, the shaft 9, Fig. 36, is turned by means of a handle, so that the arms 17 are swung upwards, the part 15 of the latch 16 coming in contact with the base 7 of the truck and releasing the warp beam from the hook 14, so that it can be rolled into a recess in the loom frame. The clamps are of special form. Means for turning the slide 166 to its rear position when one thread only is caught by the selectors are described. The latches 264, 265 can be placed out of action by a hand-operated slide. Other details are described.