Patent GB-605185-A (GB)
Title: An electrically operated stop motion for a warping or beaming plant
IPC: D02H13/00
Filed: 1944-04-21
Abstract: 605,185. Warping; stop motions. LAMBACH, F., and SIEGEL, W. April 21, 1944, No. 7385. Convention date, Feb. 1. [A Specification was laid open to inspection under Sect. 91 of the Acts, Nov. 13, 1944.] [Class 142(iv)] [Also in Group XXXVII] in an electrically operated stop motion, for a warping or beaming plant, having a control finger arranged for engagement by a warp yarn and a mercury switch, comprising a stationary container for mercury and a movable contact element, the movable contact element is connected directly to the control finger. In one embodiment, Fig. 4, a contact element 294 is soldered to a wire control finger 280, pivotally mounted on a bar 250, and normally supported by a yarn 36. The control finger 280 is connected to an electrical stop stop circuit through a wire 298 and, upon yarn breakage, the finger 280 falls, allowing the contact element 294 to dip into a container 284 containing mercury 286 electrically connected to the stop circuit. Dust shields 304 may be provided. In a modification, two mercury containers may be associated with a single control finger, the contact element being of inverted U- shape to dip each arm into a mercury container on yarn breakage, thus completing the circuit without using the control finger as a conductor. In a further embodiment, Fig. 10, a slidable control finger 338 carries a contact bridge 334, which closes the stop motion circuit when allowed to fall into two mercury containers 306, 308. The control finger 338 may carry a contact element connected to one side of the control circuit and arranged to dip into a single mercury container. If it is desired to immobilise the control finger when no yarn is running through the finger eyelet 336, a locking rod may be inserted through a stationary eyelet 348 and the eyelet 336 and hooked over a guiding rod 364, in order to hold the contact bridge 334 out of the mercury. When several control units are arranged side by side. they may be held in the threading position simultaneously, with the eyelets 348, 336 substantially in alignment. A lifting rod 376, guided in slots 378 in stationary end-supports, may be raised bv means of a manually operated lever 368 to-contact and lift projecting elements 350 of the contact bridges 334. The lever 368 has a toggle-like action enabling it to be spring-held in either its raised or lowered positions. A yarn tensioning rod 386, guided in slots 378, may rest loosely on the projecting elements 350. The extent to which the rod may draw downwards the control finger 338 and the yarn 36 is adjusted by screws 388 associated with each end of the rod. The Specification as open to inspection under Sect. 91 comprises also a control unit having a pivotally-mounted, totallyenclosed mercury container, a frame arranged to support a number of rows of control units and control circuits (see Group XXXVII) including means for indicating the individual control units which have fallen into yarn breakage positions. In Fig. 6 (Cancelled) is shown a spherical mercury switch 156 having a control finger 40 rigidly secured to it. Wires are fused into diametrically opposite points on the glass wall of the switch casing, their outer ends 172 acting both as pivots and as conductors, their inner ends being bent so as to be immersed in the mercury on yarn breakage. Several control units may be arranged side by side on a horizontal supporting bar, which may also carry a manual stop switch for the warping or beaming plant, a circuit-closing switch for rendering operative the row of control units, an indicator lamp which lights when one or more yarns break and a resistor to maintain continuitv of the circuit should the lamp burn out. The horizontal supporting bar mav be mounted on one of two vertical upright posts forming a frame carrying many, e.g. twenty, bars. The frame may also carry an annunciator indicating numerically the bars on which a control unit has fallen into yarn-breakage position. Reference is made to Specification 563,857, [Group XXXVII], as disclosing an example of a suitable control system for use with the stop motion of the present invention. This subjectmatter does not appear in the Specification as accepted.