WIRE FEEDING DEVICE IN WIRE ELECTRIC DISCHARGE MACHINE

摘要

PROBLEM TO BE SOLVED: To ensure feed of a wire in a wire feeding device by providing an air injection nozzle close to drawer-rollers. SOLUTION: In this wire feeding device, an air injection nozzle 6 is provided close to drawer-rollers 17 provided in proximity to an outlet 32 of a wire guide pipe 15 for pulling in a wire 1 supplied from a lower wire head for receiving the wire after machining a work. The air injection nozzle 6 is provided with a solenoid valve 6A which is opened in response to the rotation of the drawer- rollers 17. A controller 40 opens the solenoid valve 6A of the air injection nozzle 6 in response to the rotation of the drawer-rollers 17 to control the air injection nozzle so that air is injected in the advancing direction of the wire 1.