Patent GB-388082-A (GB)
Title: Improvements relating to automatic shuttle changing looms
IPC: D03D45/34
Filed: 1931-05-23
Abstract: 388,082. Looms with automatic weft replenishment. DOBSON, R., Fabrica Cruzeiro, Andarahy Grande, Rio de Janeiro. May 23, 1931, No. 15263. [Classes 142 (i) and 142 (iii).] Shuttle-changing mechanism.-The shuttlebox front provided with a bottom portion is pivoted coaxially with and normally moves with the slay D, but is separated therefrom, as shown on Fig. 2, and maintained in a stationary position for one revolution of the crank shaft by the engagement of hooks c<1>, c<3>, whilst a fresh shuttle is inserted by a pusher E from a magazine into a carrier F, F<1>, which is rotated to feed the shuttle over the front plate c on to the front C. The spent shuttle is received on a raised spring-controlled guide Q and is directed on to a tray or shoot R. Initiation of shuttle change.-This is caused by the rotation of a feeler shaft N controlled by weft-feeler mechanism and actuating lever mechanism for clutching a normally stationary shaft J to a disc driven by chain gearing from the bottom shaft, the shaft J being thus given a complete rotation, devices described being used to prevent the disengagement of the clutch until the shaft J has made a complete revolution and to retain the declutched shaft in correct position. A cam K on the shaft J operates lever mechanism for rotating a shaft k concentric with the shaft N. The shaft k is spring connected to the adjustable hooked arm c<2>, which is raised into position to engage the hook c<3> on the front C and retain this in a forward position against the action of a spring c<10> acting on lever mechanism c<9>, c' and a strap &c. c<4>. Shuttle transfer mechanism.-A second cam f<14> actuates lever mechanism for turning shafts H, e<3>. These actuate lever mechanism for controlling the pusher E and rotating the shuttle carrier, which comprises two jaws F, F<1> pivoted on a shaft f<3>. The jaw F<1> may be narrower than the jaw F and may be moved towards it by a spring coiled around the shaft f<3>, a stop holding the shuttle carrier normally in a vertical position and this stop may also normally hold the jaws in a non-gripping position to receive a shuttle fed by the pusher E. When the shuttle carrier is rotated into a horizontal position, the jaws F, F<1> grip the shuttle, which is fed over stationary guides f<10> and over the front plate c on to the front C, the jaw Fl entering a slot therein. When the lay returns, taking the front C with it, the shuttle is withdrawn from the carrier. Shuttle-ejecting arrangements. -The guide Q is normally held by the front in a lowered position, but is raised by a spring q<2>, when the front and lay separate, into position to receive and deflect the spent shuttle. The shuttle swell a may be moved out of the shuttle box at the time by parts a<2>, a<5>, a<6>, connected to the shaft of the spring-controlled devices for connecting the box front and back together. The guide is positively lowered, before the return of the front C to normal position, by a flexible connection q<4> and lever mechanism actuated in a manner described. Positioning picker. The picker s<2> is positively returned by a strap s<4> and short stick s<3> on a slotted spring-controlled plate s<5> engaged by a pin &c. s<8>. Stop-motion acting when the weft-replenishing mechanism is obstructed. The shuttle carrier shaft is carried by L-shaped arms f<4> on a spring-controlled shaft, so that in case of obstruction the shuttle carrier may move away from the lay and arrest the transferring operation. This yielding movement may also actuate mechanism for stopping the loom. According to the Provisional Specification the shuttle carrier is turned by an upright hook actuated by lever mechanism from a cam on the bottom shaft.