Patent GB-562193-A (GB)
Title: Weft replenishing loom
IPC: D03D45/20
Filed: 1942-07-23
Abstract: 562,193. Looms with automatic weft replenishment.. TRIGGS, W. W. (Crompton & Knowles Loom Works). July 23, 1942, No. 4942/44. Divided out of 562,167. [Class 142 (iii)] In a pick-and-pick weft mixing loom having a gang of two shuttle boxes 38, 39 which shifts in a four-pick cycle and wherein the upper box 38 is moved to inactive position during the first pair of picks of a cycle and to active position during the second pair of picks, the weftreplenishing mechanism is actuated under control of a weft-detector to effect replenishment of the shuttle in the upper box during the first pair of picks, and means are provided for preventing the weft detector effecting replenishment during the second pair of picks. The weft-detector 136 indicates lack of weft in the shuttle in the upper box, and a revoking finger 254 is secured to the slide 135 carrying the detector 136 to detect an incorrectly positioned shuttle and prevent the detector 136 functioning. The loom may be used with a 4 x 1 setting for automatic weaving with several colours, with a 4 x 2 setting for automatic pick- and-pick weaving for mixing wefts of the same colour, and with a 4 x 4 setting for non-automatic pick-and-pick weaving ; the weft supply magazine M can be supported in raised position for the 4 x 2 setting, in a lower position for the 4 x setting, and can be swung upwardly and backwardly out of the way for the non-automatic 4 - 4 setting. The weft-replenishing mechanism comprises a bobbin-releasing device for each compartment or stack of bobbins in the magazine and a common transfer member. The bobbin-releasing member comprises a cradle 60 having a nose 61 to support the bobbins above it and a pin 62 to hold a bobbin in the cradle, and the device is operated by a slide 70 having an L-shaped slot 74 to receive an operating pin 75 on the cradle. Horizontally - spaced fingers 80, 81 on a stack selector 78 can be brought into engagement with lugs 82, 83 on any of the slides 70 to release a bobbin from a particular stack by means as described in Specification 558,966. A rod 92 is reciprocated by a cam 187 on the bottom shaft 33 and is operatively connected to a rod 87 connected to the stack selector 78 when the weft-detector 136 indicates an exhausted bobbin. The formation of the cam 187 is such that the release of the bobbin is effected in two stages ; the cradle 60 is first rocked to bobbin receiving positioning, the lowest bobbin being freed by the pin 62, and thereafter the cradle returns to its previous position, allowing the bobbin to move to transfer position. The connection between the rods 92, 87 comprises a control pin 148, Fig. 5, normally spring held out of engagement with a floating lever 88 carried by the rod 87 and moved by the detector 136 into the path of the lever 88. The lever 92 has two vertically spaced slots 159, 188 for receiving an actuating pin 158 upon the cam-operated lever 156, the spacing of the slots being determined by the difference in level of the magazine in the 4 x 1 and 4 x 2 settings. To prevent the weft-detector 136 indicating weft exhaustion during the second pair of picks, i.e. when the upper shuttle box is in active position, a cam 194 is provided on a bracket 130 and engages a lever 193 pivoted upon the carrier 132 supporting the weft-detector. When the detector is lowered with the cam boxes, the cam 194 rotates the lever 193 to bring a shoe 192 into engagement with the detector-slide 135 to lock the detector in inoperative position. Specifications 489,252 and 562,167 also are referred to.