GB127229A - Apparatus for Electro-magnetically Controlling Jigging Conveyors. - Google Patents

Abstract

127,229. Candlot, C. May 24. 1918, [Convention date]. Reciprocating-machines; solenoids. - A jigging conveyer is actuated directly by one element of a solenoid. The conveyer 4, Fig. 1, is connected by brackets 3 to the core 2 of a solenoid the coil 1 of which is fixed to the ground. Buffers 5 limit the stroke. The coil is connected by wires 0-0, 1-1, 2-2, &c. to segments 0, 1, 2, &c. of a switch 6, which diminish in length, and current is distributed successively to the convolutions of the coil -situated between each pair of wires 0-0, 1-1, 2-2, &c. by a contact lever arm 7, Fig. 3, mounted on the same axis as a pendulum 8. The movement of the pendulum is maintained by a solenoid 11 the core 12 of which carries a conducting-strip 13 that establishes current in the solenoid only when it rubs on the pair of resilient conductors 14. In a modification, the distances between the points of connexion of the pairs of wires 0-0, 1-1, &c. with the coil are unequal, and the thickness of the wire composing the coil is not uniform. In this arrangement, Fig. 7, successive portions of the winding of the solenoid are cut out by the movement of the rotary arm 30, Fig. 9, carrying the contact brush 28 around the commutator 26. Current is supplied to the brush 28 by a rubbing contact 33, insulated ring 31, and a wire (not shown). A worm-wheel 34 keyed on the boss of the arm 30 is rotated by a. worm 36 mounted on the shaft of a small electro-motor. The solenoid, Fig. 7, may be controlled alternately by the electro-magnetic relay, Fig. 11, and, in this arrangement, the segments 7<1>, 6<1>, &c. of the commutator corresponding to the return stroke are slightly different from the corresponding segments 7, 6, &c. of the forward stroke. When the brush 28 is on any segment.of the commutator 26, a current of low intensity flows in the corresponding coil, e.g. the coil 22 of the relay, and causes the core 23 carrying the contact 24 to move up until contact is made with the two segments 25. The commutator is then coupled to the main circuit in which flows a current of great intensity. When the current ceases in the coil 22, the core 23 drops and the current is interrupted at 0; but since the brush has passed on to the adjacent segment of the commutator, the next core is raised, current is established at 1, and so on. In another modification, Fig. 12, the coil 1 of the solenoid is fixed to the conveyer 4 and the connexions are spaced uniformly along the length of the coil, but the wire of the various sections of the coil is of different thicknesses. The connexions 1, 2, &c. are connected to segments 46 mounted on an insulating-bar 47 which carries a bar terminal 49 for the supply of current to one end of the coil. A brush contact-arm 48 moves over the segments 46 and is carried by a sleeve 51 of non-magnetic metal that connects two soft-iron alined cores 52, 53 which are alternately actuated by the solenoids 54, 55 owing to the action of a double-pole interrupter 56. Current is fed to the interrupter by an arm 57 fixed on a rod 58 provided with projections 59, 60 which are in the path of a stop 61 secured to the coil. The buffer springs 45 may be replaced by pneumatic cushioning-devices 62, 66, Fig. 14, the former of which slowly retards the movement at the end of the return stroke, and the other suddenly stops the conveyer and sends it backward. The cushioning-device 66 comprises a piston 63 fixed to the core and a cooperating hollow member 66 secured to the coil. The member 66 for about half its length is of greater diameter than the piston 63, and for the remainder of its length it gradually decreases in diameter until it snugly fits the piston. The cushioning-device 62 comprises a piston 64 and a cylinder 62. In a modification, two solenoids may be connected by a core forming a closed magnetic circuit. In other modifications, the core is hollow and mounted on a tube of magnetic or non- magnetic material, and a second coil may be wound on the core. The core may be of circular or polygonal cross-section and may be solid, hollow. built-up, or laminated.