Wire cutter

Abstract: An improved ultrasonic wire bonding method and apparatus is disclosed having a wire delivery conduit for removing coil set in the wire through a serpentine movement prior to being bonded, which also provides sufficient drag to prevent displacement as the bonder with the wire is being moved from one location to another, and which orients the wire to said bonding tool end. An improved wire cutter moves independently of the wire bonding tool and is directly connected to the main Z positioning movement of said wire bonder so that the wire bonding tool and the cutter can move independently during the process. The wire bonding tool can be biased by a magnetic bias with an armature connected to the wire bonding tool. The wire bonding apparatus and the method provide a loop in the wire between first and second bonds by forming an arcuate bend in the wire as it moves away from the first point of bonding. After a second bond, the wire is partially cut by a cutter that moves relative to the bonding tool to partially cut the wire which is then severed by pulling the bonding tool and cleating the wire in the end thereof.

Abstract: A small, simple, accurate, low-cost wire cutting and stripping apparatus includes a wire feed mechanism which periodically feeds a measured length of an insulated wire strand to a wire cutter/stripper mechanism which clamps the wire strand, severs it and scores the insulation, axially separates the wire segment cut from the wire strand and strips the scored insulation during such axial separation. The wire feed mechanism is driven intermittently by a continuously rotating electric motor through an electrically-operated wire feed clutch/brake, the clutch mechanism of which engages in response to an electric signal from a timer switch (start wire feed) and which disengages in response to an electric signal from an electric wire measuring encoder (measure and stop wire feed). The wire cutter/stripper mechanism includes a stationary pair of separable clamps, a movable pair of separable bladed cutter/stripper heads and a movable pair of separable clamps. A barrel cam is periodically rotated for one revolution by the continuously rotating electric motor through a solenoid-operated one-revolution clutch in response to an electric signal from the encoder (wire feed stopped, make one cam revolution). The barrel cam has two cam tracks and drives two linkages. One (clamp/cut) linkage simultaneously closes (and subsequently simultaneously reopens) both pairs of clamps and the pair of cutter/stripper heads. The other (strip/return) linkage extends (and subsequently retracts) the movable pair of clamps and the movable pair of cutter/stripper heads so that the former moves a greater distance than the latter along the wire path.

Abstract: A machine for automatically wiring an insulated fine wire as thin as a hair on the printed circuit board of wiring patterns are set up between adjacent conductor printed circuit board to be applied with wirings is carried by an X-Y table which is movable in X and Y directions, and the X-Y table is moved in accordance with wiring sites. A wire guide unit, a bonding unit and a wire cutter unit mounted, above the X-Y table, to a head rotatably supported about an axis perpendicular to the X-Y table surface are rotated along with the head so as to be oriented in various directions an optical device is supported for optical monitoring of the operations from above along the rotational axis of the bonding head. The wire guide unit sequentially pays out the insulated fine wire onto the printed circuit board carried by the X-Y table, the bonding unit exposes the core of the payed-out insulated wire and fuses the wire for connection thereof to the conductor pad of the printed circuit board by heating and depressing the payed-out wire, and the wire cutter unit cuts away the wire after completion of wiring.

Abstract: The present wire cutting device, intended for cutting bomb wires, has a barrel with a wire-receiving slot which is open at one side of the barrel. A blunt-faced dielectric piston in the barrel is explosively actuated to sever from the wire the complete length of the wire segment extending across the barrel at its wire-receiving slot. The explosion gases escape through the slot behind the piston and blow the severed ends of the wire away from the barrel and away from each other. Different explosive attachments are provided for detachable connection to the barrel to provide a manually-initiated percussive charge or a time fuse-initiated charge or an electrically-initiated charge.