Multichannel sequencing system

Claim 1

A multichannel sequencing system for a machine tool element which is shiftable along a respective axis, said system comprising: a rotatable drum having an axis of rotation and an axially extending bounding surface; a plurality of axially extending slots in said bounding surface, said slots being angularly spaced apart from one another; stop means axially slideably engaged in each of said slots; track means extending axially adjacent and parallel to said surface; first switch means having two control conditions and axially slideably mounted to said track means and carried thereby sO as to be engageable with the said stop means to assume one control condition, and to clear the stop means at another axial position to assume another control condition, the first switch means being physically interconnectable with the machine tool element in order that its axial movement will be proportional to that of the machine tool element, a second switch means in serial connection with the first switch means, a moveable surface whose position relative to the second switch means is indexed to the rotary position of the drum, whereby different portions of the moveable surface are respectively aligned with the second switch means when respective slots are aligned with the first switch means, and actuating means carried by the moveable surface to actuate the second switch means when the first switch means is to be effective.