1. A limit switch assembly comprising slider means movable with axial movement of an input shaft, cam means carried by said slider means for movement therewith and actuator means located adjacent switch means and having a first position spaced from said switch means and a second position in engagement with said switch means, said cam means being engaged with said actuator means in said first and second positions thereof and being operatiave to move said actuator means from said first position to said second position when said slider means moves in one direction, whereby a limit signal is developed, said cam means further being adjustable whereby the spacing between said first and second positions of said actuator means is adjustable.

15. A limit switch assembly including a housing member having a slider plate slideably carried therein, said slider plate being fixed to a slideable shaft member extending therefrom and adapted to be mounted to a rotary drive shaft for axial movement therewith, spring means bearing on opposite faces of said slider plate for exerting a force locating said slider plate in said housing member, cam means mounted on said slider plate for movement toward and away from actuator means mounted adjacent switch means, said actuator means having a first position spaced from said switch means and a second position in engagement with said switch means, said cam means including a cam member rotatably mounted about a pin member extending from said slider plate along an axis adjacent said actuator means, said cam member further being formed with a plurality of notches on a first side adjacent said slider plate and cooperating with a locking pin carried on said pin member for locking said cam member against rotation when one of said notches seats on said locking pin, spring means bearing on a second side of said cam member adjacent the free end of said pin member and being retained in engagement with said second side by a nut assembly whereby the force exerted on said cam member can be varied to lock said cam member or allow rotation thereof, said actuator means including a pivoted arm member having one end adjacent said cam member and the other end adjacent said switch means, said arm member being biased to said first position, and being movable to said second position by said cam member when said slider plate moves in one direction, the spacing between said other end of said arm member and said switch means being adjustable by said cam member whereby the distance said slider plate and said drive shaft can move before said actuator means moves from said first position to said second position is also adjustable.