Patent GB-431208-A (GB)
Title: Improvements in or relating to looms with automatic weft replenishing mechanism
IPC: D03D45/20
Filed: 1934-01-18
Abstract: 431,208. Looms with automatic weftreplenishing mechanism. POTTER, E., 3, Staple Inn, High Holborn, London.- (Assignee of Baker, W. H. ; 645, Beacon Street, Boston, U.S.A.) Jan. 18, 1934, No. 1851. Convention date, Jan. 18, 1933. [Class 142 (iii)] A change - box loom employing a number of shuttles for weft-mixing purposes is provided with a feeler for engaging the weft in shuttles successively and thereby controlling the bobbin magazine and transfer mechanism positionedaboveamulticell box. The transfer is effected while the box is locked in the raised position, the insertion of a new bobbin into the shuttle in the top box causing the spent bobbin to be ejected through the empty lower cell. The invention is described in connection with a change-box loom having twin cells at each end of the lay and employing three shuttles, a weft feeler 1, Fig. 14, being mounted on the lay above one set of change-boxes to engage the bobbin in the upper box on movement of the lower cell into line with the race. Weft feeler arrangements. Substantial exhaustion of weft produces a sidewise movement of the feeler 1 to bring a pin 13 into position to operate a bellcrank lever 15, 16 on the loom frame and propel the end 25 of a rod 23 up an inclined shoulder 24 on a stand 26. This movement raises a latch 27, which is pivoted to an arm 29 on the rock shaft 31, into the path of an actuator 33 operated by a cam rotating at one fourth of the speed of the crank shaft. The rod 23 is retained in operative position by a resiliently mounted plate on the stand 26 until positively dislodged, on the operative stroke of the actuator 33, by a cam on the underside of the latch 27. Shuttles, changing bobbins and the like in, automatically. On operation of the rock shaft 31, an arm 47, Fig. 4, thereon, acting through a yieldingly connecting rod 49 and a link 63, projects a shuttle feeler 65 across the race and causes a latch lifting arm 62 to position a transferrer dog 69 in the path of a bunter or fin 91 on the change-box. Subsequent engagement of the members 69 and 91 operates a transfer hammer 71 and thereby effects the transfer of a fresh bobbin from a magazine to the shuttle in the upper box, the empty spool being ejected through the empty lower cell. The initial movement of the arm 62 is utilized to operate, through a yielding connection 86, Fig. 18, and a lever 82, a pivoted spring controlled magazine driving pawl 78 and thereby move the first bobbin 73 against a stop 76 and immediately below the transferrer 71. On removal of the bobbin 73 from the magazine, the energy stored up in the spring 92 produces a further upward movement of the pawl 78 which then advances the rotor to bring the next bobbin into position. The change-boxes are locked against movement during transfer by moving an arm 87, Fig. 5, which is pivoted on the change-box adjacent the fin 91, into engagement with a slotted rod 120 on the lay, the same movement of the arm 87 withdrawing the shuttle binder 85 of the lower box. The arm 87 is operated during the forward movement of the lay by a pivotally mounted actuator 95 which is supported by an arm 99, Fig. 4, depending from the transferrer shaft 100 and is moved into operative position by the dog 69, the relative positions of the members 69 and 95 being such that the boxes are locked before the transfer is made. A pin 144 on the upper face of the shuttle-box and in line with the bobbin axis facilitates threading of the freshly inserted bobbin during the backward stroke of the lay, and on the first pick subsequent to replenishment the new weft end is guided out of the shuttle-box and clear of the pin 120 by guides on the lay and the change-box. The weft extending from the exhausted bobbin to a projection 154, Fig. 5, on the shuttle-box is severed by a weft parter 66 on the shuttle feeler. Specifications 334,583, [Class 142 (iii)], and 383,247 are referred to. The Specification as open to inspection under Sect. 91 comprises also means for inserting a fresh bobbin into the lower cell of a twin cell shuttle-box. the empty upper cell being used as a corridor. This subject-matter does not appear in the Specification as accepted.