Apparatus having a variable stroke reciprocating member and means responsive to a predetermined stroke to control a circuit

Apparatus including operating means including a working element reciprocated thereby with the length of its stroke varying in a predetermined relation to the work accomplished, control means including a switch responsive to a predetermined stroke length that is a measure that the work accomplished by the reciprocating means has reached a predetermined state, a follower member, and a track member with which said follower member is in engagement and which includes first and second courses each including an end section representing the retracted position of the element, first and second course shifters between said courses, the first adjacent said end sections and the second at a location representing said predetermined stroke length, said first course shifter operable to transfer the follower member to the second course on appropriate travel of the element from the first end section, said second course shifter operable to permit the follower member to pass therethrough and return via the first course if the stroke of the element permits the follower member to pass through the second course shifter, the follower member otherwise returning along the second course, said control switch associated with one end section to be operated by the follower member when therein and the other end section receiving the follower member until said predetermined stroke length is attained, one member being fixed and the other member including a connection with said operating means operable to cause relative reciprocating movement between the members in proportion to the strokes of the element.