Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Locking means
Patent
1985-03-25
1987-01-13
Staab, Lawrence
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Locking means
74426, B23B 2924, F16H 116
Patent
active
046355073
ABSTRACT:
A ridge spirally wound around an outer peripheral cam is held between each pair of followers of a rotatable body including a plurality of such followers planted therearound at equal intervals. The ridge of the outer peripheral cam consists of a gentle slope portion having a minute but substantial lead angle other than zero degree and steep slope portions having large lead angles and being continuous from the gentle slope portion at opposite ends thereof. The steep slope portions at opposite ends of the ridge are juxtaposed to each other in parallel relationship. The rotatable body is rotated at a high speed when the followers are engaged with the steep slope portions but rotated at a slow speed when the followers are engaged with the gentle slope portion of the ridge, as the outer peripheral cam is rotated. The output shaft is connected to the rotatable body. The outer peripheral cam is driven by a control motor adapted to be stopped at a desired angular position. The output shaft has respective desired indexed positions preselected within respective ranges in which the output shaft is rotated at a slow speed. Rotational angles of the outer peripheral cam are measured with respect to the respective desired indexed positions and stored in a memory of a control device. The control motor is stopped on the basis of the respective stored values so that the output shaft is repeatedly stopped at the respective desired indexed positions.
REFERENCES:
patent: 3686979 (1972-08-01), Petri et al.
patent: 3817116 (1974-06-01), Georgieff
patent: 3850051 (1974-11-01), Woltjen et al.
patent: 4189963 (1980-02-01), Sano et al.
patent: 4366421 (1982-12-01), Eto et al.
Adams Bruce L.
Burns Robert E.
CKD Kabushiki Kaisha
Lobato Emmanuel J.
Staab Lawrence
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