Patent GB-426327-A (GB)
Abstract: 426,327. Covering cores by winding. SYNCRO MACHINE CO., 241, Laurel Avenue, Arlington, New Jersey, U.S.A. July 28, 1933, No. 21278. Convention date, Sept. 22, 1932. [Class 109] [See also Group XXXVII] A machine for wrapping a web around a core comprises a core-feeding member, web-wrapping means for applying the web to the core, positive electrical means for directly driving the corefeeding member, a second positive electrical means for driving the web-wrapping means and circuit means including a generator for causing the member and web-wrapping means to operate in a desired timed relation. As shown, the feeding member is a capstan wheel 11 which is driven, through gears in a housing 9, by the motor of a motor-generator 10, and the web-wrapping means are two serving heads 23 which are driven by motors 22. Means for causing the wheel and heads to rotate in a desired timed relation are shown diagrammatically in Fig. 6. To start the machine the switch 57 is closed and current from a three-phase A.C. mains supply energizes the fields of the motors 22 and induction generator 62 via wires 60<1> and 60<11>. A switch 69, normally open, is then momentarily closed and current flows from one wire A through wire 70, switch 69, wire 68, solenoid coil 65, wire 64 to another wire B of the same phase as A. The coil 65 is thus energized, causing switch 59 to close and remain closed, whereby (1) the field of squirrel-cage induction motor 61 is energized (via wires 60) and the motor starts rotating capstan 11 and driving generator 62 which thus supplies current via wires 63 from its slip-rings to the rotor windings of motors 22 which then also begin to rotate, (2) brake coil 79 is energized and the brake is released, and (3) current passes, via the secondary of a transformer 80, to a winding 81 which is thus energized, switch 82 is opened, thus breaking the circuit of a solenoid coil 44 which holds a clutch out of engagement, and in the casing 9 by spring action a clutch engagement is effected which transmits motion from the common shaft 36 of the motor 61 and generator 62 to a vertical shaft, (not shown), engaging with horizontal shafts, (not shown), which drive the serving heads mechanically. The take-up reel 15 is rotated mechanically via telescoping shaft 12. The serving heads are thus being driven directly and mechanically. This state of affairs, which ensures synchronism of the capstan wheel and serving heads during starting and stopping, continues until the generator 62 is up to full speed, by which time a dash-pot 83 has slowly permitted the switch 82 to close and solenoid coil 44 is thus energized and the clutch is disengaged, the serving heads being now driven wholly by their motors. When the switch 59 is opened the solenoid coil 44 is de-energized, and the clutch elements re-engage. The rotors of the motors 22 may be provided with speed adjusting devices. When switch 59 is closed by coil 65, a holding circuit for the coil 65 is as follows : wire B, wire 64, coil 65, wire 66, pole 67, wire 76, closed switch 75, wire 74, contacts 72 of an automatic stop switch, wire 71 and wire B. If the wire W breaks, a roller bearing against it and mounted on the end of a pivoted lever 73 drops, the contacts 72 separate, hold-in coil 65 is de-energized, the switch 59 opens and the machine stops. The machine shown comprises a brake 5 urged by a spring 7 to bear on the rim of the supply reel 4, guide mechanism 25 which oscillates back and forth the pulley 26 so as to feed the wire on to the take-up reel 15 in smooth layers, and spare cops of insulating material 29, 31, 32. In a modified electrical circuit the motor-generator 10 is replaced by a single induction motor (which drives the capstan) to the slip-rings of which current is supplied from a motor-generator similar to 10, the generator also supplying current to the fields of the serving head motors. A modified machine having only one serving head is provided with a device for applying an adhesive or insulating coating to the wire before it reaches the serving head, a device for applying an insulating coating on the wrapped web, and electrical means for drying the coatings.