Importance

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Abstract

This invention relates to an improved control circuit for use with a magnetic clutch and a Brunswick automatic pinsetter for the purpose of shutting down the pin retrieval function performed by the latter during those intervals when it is not needed, such circuit being characterized by a pair of parallel direct current paths to the clutch magnet, one of which is effective to instantaneously actuate the pin retrieval operation whenever a ball has been rolled while, at the same time, energizing the thermal element in a branch path to the other circuit which element, once it becomes hot, is effective to establish the alternate path to the clutch and maintain the pin retrieval function operative for a brief time interval after both the pinsetter's rake-cycle and pin-storage cycles have been completed. The improved circuit also functions to actuate the pin retrieval function even though the thermal element malfunctions and thus fails to establish the alternate current path, the only loss in function being the brief period of continued pin retrieval after the pin-raking and pin-storage cycles have been completed. The invention also encompasses the novel method of controlling the pin retrieval functions of the pinsetter which includes the steps of actuating the latter immediately upon the occurrence of an event that presumably results in the presence of downed pins that must be retrieved and stored, simultaneously energizing a thermal element and using the latter to establish an alternate way of keeping the pin retrieval function operative for a brief time interval following completion of the pinsetter's pin-raking and pin-storage cycles.

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First Claim