Patent GB-191510128-A (GB)
Title: Improvements in Automatic Weft-replenishing Looms.
Inventor: WHITTAKER JOHN
IPC: D03D51/00
Filed: 1915-07-12
Abstract: 10,128. Whittaker, J., Bradshaw, R., and Briggs, J. July 12. Stop-motions, weft; stop-motions acting on too frequent weft-replenishment. In automatic weft-replenishing looms, there is provided a lostmotion device which is adjustable to stop the - loom after three or two successive indications of weft-failure, or to make the loom act as an ordinary loom with stoppage after one such indication, the lost-motion device being actuated by a pawl, which is normally clear thereof, and being constructed as described below. In one form of the device, upper and lower levers 5, 6, Fig. 3, are pivoted on one pin on the breast beam. The lever 5 has an abutment to act on the lever 6 and has secured to it the sliding rod 3 of the weft-fork holder. Upon weft-failure, the lever 5 is moved forwards with the rod 3 and moves the lever 6 into the first dotted-line position, where the lever 6 is held by a detent 21 on a two-armed lever 19, 20 pivoted at 18 and acted upon by a spring 23. If there is no successive indication of weft-failure, a pin 24 on the weft hammer 4 acts on the arm 20 and frees the detent 21 from the lever 6, which thereupon returns to normal position under spring action. If, on the other hand, the rod 3 is again moved forwards, an extension 15, on a pawl 12 pivoted to the lever 5, is freed from an abutment 17, and the pawl 12 drops, so that a catch 13 thereon engages the displaced lever 6 and moves it into the second dotted-line position, where it is held by a second detent 22. A further indication of weft-failure causes a further catch 14 on the pawl 12 to move the lever 6 to act on the shipper-handle and stop the loom. The lever 6 has a two-stepped adjustable block, which may be moved along the lever to bring either stop opposite the shipper-handle to stop the loom after two indications of weft-failure or one such indication. In another form of the device, the rod 3, Fig. 4, slides in guides 6<a>, 7<a> and has a block 11<a> with a pivoted pawl 13<a>, which cooperates with three notches in a. lever or quadrant 14<a> connected by a spring 26<a> to an arm on a pivoted detent 25<a>, which co-operates with notches 18<a>, 19<a> in the lever 14<a>. This lever is moved forwards step by step by the pawl, and a pin 24<a> may be inserted in one of three holes 21<a>, 22<a>, 23<a> in the lever 14<a> to act on a lever 28<a> after one, two, or three indications of weft-failure. The lever 28<a> may act directly on the shipper-handle 2 or, as shown, may have an attached arm 29<a> with guides for a sliding rod 30<a>, which is interposed between a hunter 31<a> on the lay and the handle 2 to stop the loom. The detent 25<a> is released from the notches 18<a>, 19<a> if there is no indication of weftfailure, by the weft hammer 4 moving on a.n arm 27<a> secured to the shaft 9<a> of the detent. The pawl 13<a> is normally held raised by contact of an extension 32<a> thereof with an extension 33<a> of the guide 6‹. A sliding-rod device similar to the device 29<a>, 30<a> may be used in connexion with the lever 6, Fig. 3, and the pivoted levers 6, 14<a> may be replaced by sliding devices. An equivalent part of weft-detector mechanism may replace the rod 3.