Patent GB-191010130-A (GB)
Title: Improvements in Automatic Weft Replenishing Looms.
IPC: D03D45/20
Filed: 1910-04-26
Granted: 1911-04-20
Abstract: 10,130. Crossley, B., Lawson, S., and Palatine Automatic Loom Go. April 26. Speed, varying ; driving-arrangements; brake mechanism. - In order that weft - replenishing looms may be run at a high normal speed, a spring or elastic resistance is used to reduce the speed of the lay and loom after the weft fork or feeler mechanism has been operated and whilst the changing-mechanism is in action, the spring &c. accelerating the speed of the lay and loom again most strongly at the commencement of the backward movement of the lay, whereby the first pick after replenishment may be given with normal force. The retarding- mechanism may act directly upon the lay, or it may put a brake on the loom shaft; the loom shaft has a spring drive, described below, in the latter case, the driving-strap slipping in the former case, or the spring drive being also used in this case. The spring or elastic buffer may be carried by the frame or by the lay-sword. As shown in Figs. 1 and 3, a swivel catch 14 pivoted on the lay-sword may normally be raised by a spring 16 out of the path of a nut 13 on one of two rods 12, 11 between which a spring 10 is stretched. When the usual changing-shaft 7 is operated, a lever 17 rocks the catch 14, so. that the end 15 thereof engages behind the nut 13. During the forward movement of the lay, the spring 10 is thereby stretched and the speed of the lay is reduced, the nut and lever being held engaged by a forward projection 15<a> on the catch entering a corresponding recess in the nut 13, till the lay has nearly returned to its backward position, whereupon the rod 12 is held back by a nut 19, the projection 15<a> and nut 13 becoming disengaged and the spring 16 pulling the catch into normal position. The catch may engage with a lip forged on the rod 12. A modification is described, in which a flat spring is used instead of the helical spring 10. In another modification, the lever 17, Fig. 7, raises a lever 37 pivoted on the lay-sword, so that, at the end of the backward movement of the lay, a screw 35 encounters the arm 33 of a bell-crank 33, 32 and moves the arm 32 upwards free from the arm 29<a> of a bell-crank 29, 29<a> fixed on a shaft 27, a spring 30 then turning the shaft 27 and drawing a brake-shoe 28 against the brake pulley 31 of the loom. When the lay beats up, a screw 36 returns the lever 32, 33 to normal position, the curved end of the arm 32 pressing against a projection on the arm 29<a> and returning the shaft 27 to normal position and taking the brake off the pulley 31. In the spring drive for the loom shaft, the driving- pulley is loose on its shaft 41, Fig. 10.- Springs 45 are stretched between lugs 44 on the driving- pulley and lugs on arms 42 fast to a sleeve 40 keyed on the shaft 41. The springs are abnormally stretched while the brake is on, but expand again when the brake is taken off, the speed of the crank-shaft and lay being thus reduced and then increased as in the other arrangements. According to the Provisional Specification, the usual spring for returning the changing-mechanism to normal position may be used instead of a separate retarding-spring, and the weft-fork mechanism may be used to shift the driving-belt partly on to the loose pulley.