Importance

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Abstract

A pair of microswitches are mounted in the housing of an automatic screwdriver in the path of relative movement of the barrel thereof as it is urged rearwardly to activate a throttle valve and thus operate the drive mechanism of the screwdriver. Closure of both microswitches, which occurs during the driving of a fastener, resets the entire control circuit in readiness for the automatic emplacement of a new fastener upon completion of one driving operation. Release of one of the microswitches, as when the driving is completed activates a timer and air cylinder to drive the barrel forward into an extended receiving position. At the receiving position a new fastener is emplaced in the chamber of the mechanism. On completion of a predetermined time cycle, the barrel is returned to its normal position with one microswitch engaged, one not engaged, and a fastener in the barrel against the kit ready for the driving operation. Thus, a new fastener is automatically delivered to the chamber responsive to the completion of the driving of the previous fastener. Further the screw in the chamber cannot be inadvertently removed therefrom except by the driving operation.

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First Claim