Patent GB-190707834-A (GB)
Title: Improvements in Warp Leasing Apparatus.
Inventor: FISCHER OTTO
IPC: D03J1/14
Filed: 1907-04-03
Granted: 1907-07-18
Abstract: 7834. Fischer, O. April 3. Yarns, leasing.-In a machine for leasing warps, the leasing is effected by means of two spindles, which have their ends bent in opposite directions, and means are provided for tensioning the warps. The spindles receive the threads, which are separated in succession from the edge of the warp by a finger, and are caused to pass alternately over and under the threads to form the lease. The warp to be leased is passed through open grippers 2, 3, Fig. 3, in a frame 1 to the usual brush roller 4. Two bars 6 are placed across the warp and engagad by a hook 7, and the grippers are closed. The gripper 3 is pivotally supported, and is adjustable by means of a hand-crank and worm gearing to give the warp the required tension. A bar 11 is then rotated into a vertical position below the warps to support them, and the bar is held in this position by a spring. The leasing-apparatus is stationary while the thread at the edge of the warp is being separated therefrom and leased, and is then moved towards the warp through a distance approximately equal to the distance between two threads. This movement is effected by means of a screwed rod 21, which is rotated in a screw-threaded eye 22 on the frame 1 by means of a ratchet-wheel 20 and a pawl on a bell-crank lever oscillated by a cam on a shaft 16. This shaft is rotated through wormgearing from a hand-wheel 15. A spring-pressed needle 23, Fig. 11, is moved down by the action of a cam on the shaft 16, and separates a thread from the edge of the warp. Two needles 38 are lowered in a similar manner, and serve to retain the remainder of the warp in place. A lever 40, which is pivoted to the bar of the needles 38, is lowered therewith and seizes the separated thread. The upper end of the lever 40 is connected to a camactuated lever, whereby the lower end of the lever is moved to carry the separated thread to the spindles 27, 28, which pass below and above the thread respectively. The spindles have at their ends pinions gearing with the toothed edge of a plate 44, Fig. 3, which is provided with four pins adapted to be engaged by a hook 43 pivoted to a cam 17 on the shaft 16. When the spindles have engaged the threads, they are rotated through a half-revolution, so that the next thread will be engaged in the opposite manner by the spindles and the leasing will be effected. The part of the warp which is within reach of the separating - device passes between upper and lower fork-shaped guides, of which the upper is fixed and the lower is movable. A yoke attached to the rod of the needle 38 abuts against the warp behind the guides. In order to prevent two threads from being separated simultaneously, the leasing-device is moved through a distance slightly less than the distance between two threads, and if a thread is not separated the spindles are not rotated. The separated thread moves a bell-crank lever and prevents its hooked end from being engaged by a cam-actuated lever. If a thread is not separated, the bell-crank lever is engaged, and a rod on which it is pivoted is moved, and by means of a bell-crank lever prevents the book 43 from engaging a pin on the plate 44, so that the spindles are not rotated. The unleased warps are kept tight by an elevated part on a rod 50 raising the warps between the rods 6. The rod 50 is moved towards the warp with the leasing- apparatus, so that its elevated part is removed from under the leased warps. In the case of woollen and like warps, there is provided an additional separating-device, which may consist of a pivoted arm 51 provided with a laterally-projecting arm 52. The arm 51 is rocked by suitable mechanism and enaages the separated thread, which is moved by the arm 52 towards the spindles. Needles 57, 58 carry threads for maintaining the lease. When the leasing has been effected, the lower warp guide is moved down by means of a hand-lever, and the tensioning-bar 11 is simultaneously rotated to remove the tension from the warps. At the same time, the hook 43 is rendered inoperative by an abutment on an axially-movable shaft, and another hook 69 is rendered operative to cause the spindles to be rotated in the opposite direction by a reversed rotation of the wheel 15. Another abutment on the movable shaft removes the pawl from the ratchet-wheel 20. The rod 21 is rotated to move back the leasing-apparatus more quickly by chain gearing 74 connecting the rod with the shaft 16, the chain-wheel on the shaft 16 being locked by a pawl hitherto inoperative. If the warp is exceptionally close, a wheel provided with pins upon its periphery is arranged adjacent to the upper warp guide, and is rotated very slowly for the purpose of holding the threads at the proper distance apart.