| 摘要 |
A torque and impulse transmitting machine with a built-in motor wherein the tool supporting spindle receives impulses from a rotary impeller gear which drives the spindle in response to rotation of the output shaft of the motor and is biased against a flange of the spindle by a strong helical spring. The impeller gear is moved axially rearwardly and away from the spindle during each revolution of the spindle by a shifting device which has two cams or two crown gears. One of the cams or crown gears is axially movably mounted in the housing of the machine and the other cam or crown gear forms part of a hub on the impeller gear. The latter strikes against the flange of the spindle whenever it is free to follow the bias of the helical spring.
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