Patent GB-489891-A (GB)
Title: Improvements in cop changing mechanisms for looms
IPC: D03D45/20
Filed: 1937-07-13
Abstract: 489,891. Looms with automatic weftreplenishment. MARTIN, W. H. July 13, 1937, No. 19419. [Classes 142 (i), 142 (ii), and 142 (iii)] In looms having shuttles with tubular cops, stoppage of the feed of the fabric, loom stoppage and actuation of automatic copchanging mechanism are controlled by means of a weft fork 14, 14a pivoted on a pin 15 on a carriage 16 and a weft feeler 2. If weft is absent and the weft fork is engaged by a hook 25 on a cam-controlled bell-crank lever 22, the carriage is moved to the right in a guide on the breast beam and a downwardly-projecting arm 16a connected by a spring 19 to a lever on the change shaft 12 tends to rock this and thereby cause weft-replenishment. The feeler 2, which is pivoted at 6 and enters the shuttle at the beat up, has a hook shaped lever 7 which if the shuttle is not exhausted engages an aperture in a bar 9 connected to the change shaft, thereby locking the shaft against rotation, but if the weft is exhausted, the change shaft is rotated and a tubular cop from a magazine is fed into the shuttle. If the shuttle is not exhausted, a first movement of the carriage merely causes a lug 26 to engage and operate a spring-urged trip lever 27 controlling the feed of the fabric. If the weft is intact at the next movement of the lever 22, this engages a catch 28 and allows the lever 27 to assume its normal position. If, however, the weft fork is again engaged and the carriage is moved twice in succession, the loom is stopped. When the carriage is first moved, a spring-controlled slotted trip plate 30, Fig. 8, pivoted on a pin 31 and normally bearing laterally against the lever 27 moves into the position shown in Fig. 8. If the carriage is moved again immediately, and before the trip lever is returned to normal position, the plate is engaged by the lug 26 and carried along thereby, so that it operates a trip rod 44 and stops the loom, Bowden wire, lever mechanism or electrical devices being used. Operation of the change shaft 12 causes a lever 33, Fig. 6, to move a plunger 35 into the path of a lay projection 42 and a lever 34 connected by a spring 36 to a slide 37 is rocked, the slide pushing a fresh tubular cop 39 from a guide 38 through an opening 40 into the shuttle, the cop being guided by a pivoted flap 41, which it displaces, and by a projection 43. The flap may be pivoted at the top or bottom. A modification is described wherein the cop is fed downwardly into the shuttle which may have lugs constricting the opening or resilient shoulders or oblique brushes. The inner edge of the shuttle opening may be rounded off. A flap 46, Fig. 14, may be used. The shuttle box may be made wide and the shuttle which is open at the top and bottom be guided on one side solely by the spring-loaded shuttle box tongue 60, and in case a new full cop is introduced before the old cop is exhausted, due, for example, to failure of the cop detector, the shuttle may be displaced to expose a greater part of the discharge opening in the base-plate 61 so as to afford clearance for the ejected cop, which enters a discharge aperture 64, and may be ejected therefrom by a positively controlled ejector 65. The tongue 60 may be mounted on its pivot 67 by an elongated slot and be acted upon not only by the spring-controlled part 75, but also by a spring operating in the direction of the elongated slot. Weft, cutting. A sickle-shaped blade on the lay cop severs the new thread, which enters through a channel into the shuttle eye provided in the bottom or side groove of the shuttle. The weft thread from the ejected cop is severed by a blade 73 having a yoke 74 engaged by the cop inserting member 45.