Patent GB-391406-A (GB)
Title: Improvements in or relating to filling replenishing looms
IPC: D03D45/34
Filed: 1932-12-28
Abstract: 391,406. Double shuttle looms with automatic weft replenishment. STEVENS A. H., 5, Quality Court, Chancery Lane, London.-(Bigelow-Sanford Carpet Co., Inc.; Thompsonville, Connecticut, U.S.A.) Dec. 28, 1932, No. 36666. [Classes 142 (i) and 142 (iii).] Shuttle-changing mechanism.-A double shuttle loom, particularly for weaving faceto-face pile fabrics in which the shuttles are picked through upper and lower sheds, is provided with two shuttle magazines and two carriers under control of weft-feelers to supply two fresh shuttles to the shuttle-boxes when weft is exhausted in either shuttle. The working parts of the loom are stopped during shuttle changing and are then restarted automatically, means being provided to prevent the automatic restarting of the loom in the event of a shuttle being trapped, and to prevent the shuttle-changing mechanism from operating on detection of a fault by either weft-fork. Shuttle feeding arrangements. When weft exhaustion has been detected in either shuttle, carriers 48, Fig. 4, arranged beneath staggered magazines 36 and mounted on cam-controlled arms 43, 44 are moved slightly to the right and turn catches 42 which allow the lowest shuttles to fall on to the carriers. The shafts 40 of the catches are connected by linkwork to cause retaining devices to enter the magazines to support the remaining shuttles. The arms 43, 44 then move to the left carrying the fresh shuttles and allowing the catches 42 to move beneath the shuttles in the magazines. Opening the shuttle-boxes ; shuttle-ejecting arrangements. When the carriers 48 are carrying the fresh shuttles to the shuttleboxes, the common shuttle-box front 56 is raised by a cam-operated rod 121 through the link-and-lever devices shown and is maintained in a substantially vertical position by pivotal connection to a lever 55 and a link 59. As the front rises, a ledge 67 engages an adjustable stop on a lever carrying the kickers 62 which eject the spent shuttles. Shuttle transfer arrangements. Each shuttle carrier 48 is formed of two spaced parts adapted to clear gaps in the shuttle-box back 59, so that, on presentation of the shuttles to the boxes, the back 56 is enabled to engage the shuttles and retain them as the carriers are being returned to the right. As the back descends, the kickers 62 are withdrawn. Weft-feeler arrangements.-A pair of weft feelers 75, Fig. 7, is adapted to enter each shuttle. When the weft is exhausted, the feelers enter far enough to allow collars 76 to make contact with a metal part 77 on the shuttle and thereby complete a circuit through a solenoid, the plunger of which is connected to a rod 80. The rod normally supports an arm 84 connected to an actuator lever 85 so that its end 86 is held out of the path of a cam-follower 87. Initiating shuttle changing ; restarting the loom. When the solenoid moves the rod 80, Fig. 7, to the right, the actuator 85 is allowed to fall into the path of the cam-follower 87. A bell-crank lever on a shaft 91x is thereby turned to depress a rod 93, while a pin 129 on the lever turns a lever 130, Fig. 9, to cause the starting handle 15 to be moved in a clockwise direction to stop the working of the loom. The rod 93 is connected to mechanism for causing a single rotation of a shaft carrying cams for controlling the raising of the shuttlebox back and the operation of the shuttle carriers, described above. A further cam on the shaft comes into operation after the shuttle change to turn the starting handle 15 again into operative position. Shuttle stop-motions.-When either shuttle is not boxed properly, one of the fingers 157, 158, Fig. 5, allows a dagger 152, 153 to engage a notch in a frog 151 which is thereby moved to the right and turns the handle 15 into position to stop the loom. Preventing automatic restarting on trapping of a shuttle. When the frog 151, Fig. 5, is actuated, link-and-lever devices 159, 160 cause a rod 139 to be raised so that a notch 141 in its slotted end is freed from a pin 142 on a spring- controlled lever 143 having a give-way connection with the starting handle 15. Normally a cam-controlled lever 136 moves the rod 139 to the left to effect restarting of the loom after shuttle changing. When, however, the rod 139 has been raised, it moves idly to the left and does not restart the loom, and the loom has then to be restarted by turning the supplementary starting handle 146 carrying the pin 142. Weft stop-motions.-Weft-forks 169, 170, Fig. 8, are normally turned so that their tails 171, 172 clear the hooked ends 175, 176 of links connected to a vertical link 177 and pivoted on an oscillating arm 88. When a weft, for example in the lower shed, fails, the corresponding fork 170 remains in the position shown in dotted lines, so that the link 177 is moved upwardly and raises the actuator 85 out of the path of the cam-follower 87. Weft replenishment is therefore not initiated, while an arm 165 carrying the weft-forks is turned and a rod 180 pivoted thereon turns a lever 130, Fig. 9, for turning the handle 15 into position to stop. the loom. Shuttle-boxes.-The partitions between the upper and lower compartments of the shuttleboxes are extended towards the centre shed, while short guides are arranged above such extended parts.