Patent GB-190502716-A (GB)
Title: Improvements in and connected with Warp Stop Motions for Looms for Weaving
Filed: 1905-02-10
Granted: 1905-10-19
Abstract: 2716. British Northrop Loom Co., [Northrop Loom Co.]. Feb. 10. Loom stop-motions.-In warp stop-motion mechanism, comprising thin metal detectors, which are normally supported by the warps and are reciprocated vertically as the warps are shed, the detectors 1, Figs. 1 and 2, are arranged in two banks, divided by a separator 6 behind the healds M, M', and are guided by flat bars 4 passing through elongated slots at their upper ends and supported by brackets bolted to the loom frame. A feelerbar 13 is carried by arms 12 fast on a rock-shaft 11, and a loose collar 15, Fig. 2, on the shaft is rocked through an arm 16, a link 23, and a pivoted lever 24, Fig. 1, by a cam C on the cam-shaft C<x>, the lever 24 normally being pressed against the cam by a spring s<x>. As the collar 15 is rocked in the forward direction, it acts through a spring 17, Fig. 2, secured to it and to a fast collar 18 surrounding the spring, to rock the shaft 11, and as the collar 15 is rocked in the backward direction it acts through a lug 19 on it engaging a lug 20 on a fast collar 21 to rock the shaft 11 and with it the feeler arms and bar. When a warp thread breaks, its detector falls and arrests the motion of the feeler-bar, the detector being forced against one of two stop-bars 8. If the feeler is stopped by a detector in the front bank, the spring 17 yields to permit the rotation of the collar 15, and if the feeler is stopped by a detector in the rear bank the spring 8<x> is held stretched. As the shaft 11 is rocked, it acts through an arm 26, a link, and an arm 28 to rock a short shaft 29 mounted in an elongated bearing 30 on the breast beam A<40>. A slotted arm 32 on the shaft 29 is linked to a dog 35 pivoted on the lower end of a lever h. The dog 35 is thus moved into and out of the path of a bunter a<x> on the lay, and if the feeler is arrested the dog is struck by the bunter and the lever h is turned to act upon the shipper H and stop the loom. The slot in the arm 32 affords clearance for the knocking-off movement of the lever h. In order to free the fallen detector from the pressure of the feeler when the loom is stopped, a cam 39 is mounted on a rock-shaft 38 mounted in a bearing connected to the bearing 30. A controller 40 on the rock-shaft 38 is pressed by a spring S<x> against the side of the shipper H, and when the latter is moved, the spring acts to turn the cam 39, which in turn acts upon a finger 45 on the shaft 29. A rocking movement of the latter is transmitted to the feeler shaft 11, which is rocked to move the feeler into the central position. In order to enable the operative to ascertain readily in which bank a detector has fallen, or if the loom has been stopped by other mechanism, the cam 39 is provided with a handle 46, by means of which the cam 39 can be moved back into its normal position, thereby freeing the finger 45. By means of a lateral handle 47, the finger may then be rocked, the rocking movement being transmitted to the shaft 11 and to the feeler. If the feeler is free to rock in both directions, the loom has not been stopped by warp failure, and if the feeler is stopped when rocked in one direction the operative can tell in which bank a detector has fallen. As shown in Fig. 1, the device is arranged so that the feeling stroke of the feeler is effected when the detectors are raised by the shedding movements of the warps in order that a slightly slack warp may not cause the stoppage of the loom: The feeling stroke may be effected when the detectors are down by turning the cam C through 180 degrees on its shaft.