Patent GB-237123-A (GB)
Title: Improvements in automatic weft replenishing looms
IPC: D03D45/20
Filed: 1924-09-05
Abstract: 237,123. British Northrop Loom Co., Ltd., and Hollins, D. M. Sept. 5, 1924. Shuttles, changing bobbins in, automatically. - In a two shuttle loom wherein a two-compartment bobbin magazine is oscillated over a single shuttle box fixed at one end of the lay, in accordance with the movements of two movable shuttle boxes at the other end of the lay so as to position for transfer a bobbin of the colour corresponding to that in the shuttle in action at the time, a single solenoid 2, Figs. 2, 3 and 8, which is energized by means of a magnetic feeler F at the single box end of the lay, is used to control the replenishment of either shuttle. When the weft is substantially exhausted, a first circuit through the solenoid 2 by means of the feeler F is closed and the solenoid core or plunger 3 is drawn down. The lower end of the core &c. 3 acts on a lever 39, the end 39<3>, Fig. 9, of which tends to raise a trip lever 37 into the path of a cam-operated lever 41 carrying a tripper heel 40, but at this moment the tripper heel is in a forward position and prevents the trip lever 37 from rising. The core &c. 3 passes through an opening in a. spring-pressed plate 28 and a conical part 3<1> engages a spring controlled plate 29, Fig. 6, carried on the plate 28, which is thereby depressed so as to remove from its locking-position a retaining-bar 27. This bar normally locks two' spring-controlled trigger plates 23, 24 in the position shown in full lines in Fig. 3. A segmental locking-member 32, Figs. 3 and 5, fast to a shaft 17, which is rocked in accordance with the shuttle box movements, has two flanged portions 32<1> and a central notch 32<2> through which one, say 23, of the released trigger levers 23, 24 moves into the position shown in dotted lines, the flanged portion 32<1> preventing the movement of the other trigger lever. The trigger lever 23 is thus allowed to contact with one or two contacts 13, 14, which are connected to contacts 9 and 10. A stud 19 on an arm 20 fast to the shaft 17 acts on a block 16 having a segmental plate 15 for connecting a source of electricity to either of the two contacts 9 and 10, so that a second circuit is now completed through the solenoid 2 by means of the plate 15, the contacts 9, 13 and the trigger lever 23 as shown in Fig. 8. If the same shuttle remains in action, the lever 41 moves forward and operates the trip lever 37, thus causing a shaft 38 to be operated to cause replenishment, the lever 41 having previously moved backwards and freed the lever 37, to allow it to rise into the path of the lever 41 under the influence of the lever 39 acted upon by the core &c. 3. If, however, the boxes change so that the shuttle becomes inactive, the circuit is broken by the movement of the plate 15, and replenishment does not occur. The trigger lever 23, however, still remains in contact with the contact 13, since the locking member 32 has moved synchronously with the plate 15 and now presents its notch 32<2> over the end of the other trigger lever 24 whilst its locking flange 32<1> thus prevents the return of the lever 23 to normal position. As soon as the first shuttle again becomes active, the circuit through the parts 15, 9, 13, 23 and the solenoid is again completed, the solenoid core is again depressed, the lever 39 is operated and replenishment is caused. When the solenoid core &c. 3 is depressed, it first engages the plate 29 and thus depresses the plate 28, and as this plate swings about its pivot, the edge of the plate 29 is carried clear of the part 3<1> of the core &c. 3, which can thus continue its downward movement, the plates 28, 29 returning to normal position. When the core &c. 3 rises, its tapered portion 3<1> bears against the plate 28 and swings it out of the way to enable the core &c. to return to normal raised position. When the trip lever 37 is operated, an abutment 36 thereon engages an arm 33' and rocks a, shaft 33, which causes a member 35, 35<2> to move downwardly and move the displaced trigger lever 23 or 24 back to normal position, with the portion 23<2> or 242 engaged behind the retaining bar. The circuit which has caused replenishment is thus broken.