Type action drive

Claim 1

In a typewriter having supporting means, and a rotary power roll, in combination, a plurality of type action drives, each type action Drive comprising a drive member mounted on said supporting means for turning movement about a first axis; a coupling member mounted on said drive member for turning movement about a second axis between an inoperative position out of contact with said power roll, and an operative position coupled with said power roll and moving along a first path about said second axis while moving with said drive member along a second path about said first axis for operating the respective type action, said coupling member having a first guide surface; manually operated means for moving said coupling member from said inoperative position to said operative position; a guide means movably mounted on said supporting means and having a second guide surface engaged only by said first guide surface of the same type action during movement of said coupling member with said power roll, one of said first and second guide surfaces being a curved camming surface having a center of curvature coinciding with said first axis when the movement of said coupling member along said first and second paths causes separation of said coupling member from said power roll so that said first guide surface of said coupling member moves along said second guide surface to said inoperative position and smoothly disengages from said power roll; and a manual adjusting means independent of the other type action drives, and operatively connected with said guide means for displacing said guide means relative to said coupling member so that the moments of engagement between said first and second guide surfaces and of separation of said coupling member from said power roll can be independently varied for each type action drive.