Two-speed single lever stepper actuator

Details Two-speed single lever stepper actuator Two-speed single lever stepper actuator

1989-09-08

1990-12-04

Hastings, Karen M.

Paper making and fiber liberation

Apparatus

Automatic control

162344, 74142, 74522, D21F 106

Patent

active

049751514

ABSTRACT:
A two-speed stepper actuator (10) for rotationally driving a power nut (24) to adjust a slice lip spindle (20) linearly. A clamp for power nut (24) includes a bushing plate (32) driven by drive solenoid (D) which is mounted for rotation relative to power nut (24). A lever (40) is pivotally mounted on the bushing plate (32) and includes an eccentric locking cam surface (50) shaped for selective clearance of nut (24) when in the center or number 2 position and clamping engagement of nut (24) when in the opposite extreme 1 and 3 positions. A first amount of rotation of the lever (40) about its pivotal mounting (48) on said bushing plate (32) engages and locks lever end cam surface (50) against nut (24) and a second and additional rotation of the lever (40) then drives the nut (24). Three position solenoids (L) and (D) drive the bushing plate (32) and lever (40) independently and at different speeds due to an accommodation by spring (36) on pusher rod (34) of solenoid (L).

REFERENCES:
patent: 4526654 (1985-07-01), Johansson et al.
patent: 4726883 (1988-02-01), Schroeder
patent: 4770744 (1988-09-01), Dove

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