Apparatus for driving a spindle of an electroerosive machine
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United States of America Patent
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-
Jul 28, 1992
Issued Date -
N/A
app pub date -
Sep 7, 1989
filing date -
Apr 8, 1987
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The driving apparatus for the rotation of the spindle or the work piece pallet of an electroerosive machining device comprises two electric motors which drive e.g. the spindle to a rotational movement by means of two gear boxes and a plurality of gear wheels. In order to avoid any backlash in the gear box and any clearance between the gear wheels and to compensate the elasticity of the gear transmission, the two electric motors are always operated to rotate in opposite directions and/or to yield different values of torque. Thus, the entire transmission assembly is always subjected to a certain bias force so that a precise positioning of the spindle is possible by means of simple and inexpensive driving elements.
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