| 摘要 |
<p>A wire drive apparatus in a wire-cut electric discharge machine is provided, which is capable of effecting wire extension smoothly even by a single drive source, and of preventing wear of belts and variation in wire feed speed. Upon wire extension, a lower belt section (3) pivotally supported through links (33, 34, 36, L) is moved toward an upper belt section (2) with actuation of air cylinders (10, 12), so that belts (21, 31) of these belt sections are brought in urged contact with each other, and a wire is delivered for the wire extension by the belts which are traveled by rotary force of a wire drive roller (4) transmitted through gears. After completion of the wire extension, the lower belt section is moved to a position at which it is separated from the wire, and at this time the upper belt section is also separated from the wire, and power transmission from the wire drive roller to the lower belt section is disconnected. <H0> Abstract </H0> This invention provides a wire driving apparatus for a wire electric discharge machine, which is capable of carrying out a wire connecting operation smoothly with a single driving power source, and preventing the abrasion of a belt and variations in wire feeding speed. During a wire connecting operation, a lower belt portion (3), which is supported via links (33, 34, 36, L) so that it can freely swing, is moved toward an upper belt portion (2) by the operations of air cylinders (10, 12), so that belts (21, 31) of these two belts portions come into press contact with each other. Wires are transferred by these two belts which are moved by the rotational force, which is transmitted via gears, of a wire driving roller (4) and connected together. After the wire connecting operation has been completed, the lower belt portion is moved to a position in which it is spaced from the wires. During this time, the upper belt portion is also spaced from the wires, and the transmission of power from the wire driving roller to the lower belt portion is stopped.</p> |
