Tension reducer for a power tool drive apparatus
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United States of America Patent
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Apr 27, 1993
Grant Date -
N/A
app pub date -
May 11, 1992
filing date -
May 11, 1992
priority date (Note) -
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Abstract
A tension reducer for a tension controller for use on a power tool such as an inverted router. The router has a drive motor, a motor driven pulley, a router bit-carrying spindle moveable between a lowered inoperative position and an raised cutting position, a drive belt for transferring rotational motion from the motor driven pulley to the spindle, and a drive belt tension control apparatus. The drive belt tension control apparatus includes a mount for mounting the motor driven pulley in continuously variable spaced-apart relation to the spindle during operation of the router and a pressure source for exerting a predetermined pressure on the motor driven pulley and thereby a predetermined tension on the drive belt during operation of the router for rotating the spindle. A tension reducer reduces the tension on the spindle during movement of the spindle between its lowered inoperative position and raised cutting positions for preventing tension-induced hesitation in the movement of the spindle.
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