GB816675A - Improvements in wire tying machines - Google Patents

Abstract

816,675. Bundling machines. GERRARD INDUSTRIES Ltd., and RYLANDS BROS. Ltd. Aug. 30, 1956 [July 4, 1955], No. 19298/55. Class 94(1). In a machine for applying wire ties to coils of wire or rod and securing their ends by twisting on the inside of the coils, the tying wire is fed from a supply on a drum 7 through a guide 18 and between feeding and tensioning rollers 5 carried by a work head which is mounted on a rod 16 supported by a counterweighted lever 12 and guided for vertical movement within an aperture in a rotatable table (not shown) on which the coil C to be tied is supported. One roller 5 is spring-loaded and the other is driven through gearing and an extensible splined shaft 4 by a reversible electric motor 2. The wire is fed from the rollers 5 through a guide 20 to pass freely between the first of a pair of toothed grippers 21, 22 and the central post 23 of a rotary block 24 in which the grippers are mounted, and is then led under the coil C and back around the coil for insertion between the second gripper 22 and the post 23. The grippers are movable axially in a tapering slideway 25 and are actuated by a spring 26 under the control of a manually-operated lever (not shown). The block 24 is rotatable through gearing and an extensible splined shaft 6 by an electric motor 3 to effect twisting of the wires and is formed with a knife edge 28 which severs the wire from the supply at the commencement of this operation. The machine is controlled by a pedal-operated lever 8 coupled to a link 10 having a pin and slot connection with the lever 12. The initial movement of the pedal actuates a microswitch 17 to energise the motor 2 and cause wire to be fed beneath the coil C, the work head being in the lowered position. The head is then raised by a further depression of the pedal and locked in the raised position by a latch (not shown) controlled by the gripperoperating lever and the pedal is then released to stop the wire feeding operation. After the wire has been trained around the coil and its free end clamped by the gripper 22, a switch is depressed to start the motor 2 in the reverse direction so that the wire is drawn back by the rollers 5 and tensioned about the coil. This operation pulls the coil towards the work head so that it depresses a lever 29 to cause operation of two micro-switches, one of which stops the motor 2 and the other srats the motor 3 to cause rotation of the block 24 to sever the wire from the supply and twist the ends of the tie. The shaft 6 carries a worm 19 which drives adjustable mechanism operating a switch which stops the motor 3 after a predetermined number of twists have been made. The gripperoperating lever is then actuated to release the grippers and latch to free the coil and allow descent of the work head. The table is then rotated to position the coil for the application of a second tie spaced circumferentially from the first.