Patent GB-222599-A (GB)
Title: Improvements in automatic weft replenishing mechanism for looms
IPC: D03D45/20
Filed: 1923-07-16
Abstract: 222,599. British Northrop Loom Co., Ltd., and Hollins, D. M. July 16, 1923. Shuttles, changing bobbins in automatically.- In looms having drop boxes at one end thereof and a weft feeder a, Fig. 1, associated with a stationary shuttle box at the other end, substantial exhaustion of weft causes the closing of a circuit from an adapter plug w through a wire x<1>, a switch y, the feeler a, an insulated contact r, Figs. 1, 2, 6, and 7, thence through one of a series of levers p', p, solenoid coils h', wires w<3>, and shuttle-box indicator levers e<1> to e<4>, and finally through wires w<2>, w<1> back to the plug w. When a particular shuttle-box is brought to the level of the rail way, a corresponding rod &c. 10, Fig. 12, rocks the corresponding indicator lever, say e<1>, on its pivot against spring action by acting on an insulated abutment 9 of the lever. A contact 6 on this lever then contacts with a particular one of a series of contacts 7 connected to the wires w<3>, and if the feeler a indicates weft exhaustion a circuit is closed, as described, and a particular solenoid h is energized. The spring-controlled core h<2> of this solenoid is thereby drawn downwards, moving a spring catch q from a position in which it engages the associated indicator lever p, p<1>. This particular lever is thus freed, and under spring action moves from the contact r to a contact s. The original circuit is thus broken and a fresh circuit is closed through wires w<4> and an electromagnet c' controlling the transferring mechanism referred to below. The depressed core h<2> has meanwhile moved downwards a hooked catch-lever j<2> into the path of a hooked member n, n' fast to a shaft oscillated by lever mechanism and a cam. The member n, n' at this time, however, is moving away from the catch-lever and does not engage it. If the drop boxes do not change, the circuit described remains closed, the member n, n<1> engages the catch-lever j<2>, which is pivoted to an angle-lever j, j<1>, and this lever is rocked on its pivot. A slotted part of the lever receives one arm k<1> of a bell-crank lever k<1>, k<2>, the other arm of which engages a pin &c. l on a rocking cradle l<2>, whereby this cradle is rocked against spring action to release a bobbin from the magazine compartment b concerned and allow it to drop into position to be transferred into the shuttle. If the boxes change, the circuit is broken by the movement of the box indicator levers, but is re-established when the original shuttle again comes into action, and through the mechanism described a bobbin is released and drops to transfer position. The indicator lever p. p<1> which has been displaced from the contact r to the contact s is moved back to the contact r by means of a lever v linked to the angle-lever j, j<1>. Parts l, l<2>, k<1>, k<2>, j, j<1>, h<2>, q, p, p<1>, and v are provided for each compartment of the magazine. Each bobbin cradle comprises a bobbin-head support l<2>, l<3> , Figs. 2 and 5, and a bobbin-tip support secured to a rod l<1>. A looselymounted central pivoted part l<5> is acted upon by a coil spring l<6> to cause a projection l' thereon to be held normally against a part L<8> on the member l<2>. Projecting pins on the members l<2> are connected by springs. When a cradle is rocked to release the lowest bobbin in the compartment the member l<5> is brought yieldingly into contact with the next lowest bobbin so as to support it. When the electromagnet c<1> Figs. 1 and 17, of the transferring mechanism is energized, its armature c<7> raises a trip lever c', but is prevented from raising this to its full extent till a later period by the tripper heel c<6> of a cam-controlled lever c<4>. The trip lever is subsequently raised into position to be moved by the lever c', whereby the changing motion shaft c<2> is rocked and the transferring mechanism is actuated. Specification 131,831 is referred to.