| 摘要 |
An automatic, push-to-start, fluid-operated screwdriver is disclosed including a magazine providing a supply of fasteners so that only a source of fluid pressure is required for operation. A control valve is responsive to push-to-start actuation for automatically initiating a series of steps including (a) commencing operation of a fluid operated motor, (b) terminating operation of the motor when a predetermined torque level is applied to the fastener, (c) causing a subsequent fastener to be released from the magazine, (d) relatively shifting a fastener holder and rotary drive means for allowing the subsequent fastener to enter into alignment with the rotary drive means, (e) causing the holder to secure the fastener in engagement with the rotary drive means, and (f) thereafter returning to the condition prior to step (a) so that the machine is automatically conditioned for driving the subsequent fastener upon push-to-start actuation. The control valve also causes pressurization of a fluid reservoir during operation of the motor. After termination of motor operation, air pressure from the reservoir shifts the holder and rotary drive means for allowing introduction of the subsequent fastener, the holder and rotary drive means thereafter being returned to secure the subsequent fastener in engagement with the rotary drive means. The screwdriver also includes a magazine mounting alternate threaded fasteners with their ends in opposing relation, a gate assembly releasing individual fasteners from the magazine in uniform alignment.
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