Machine element or mechanism – Mechanical movements – Rotary to rotary
Patent
1991-08-30
1992-11-03
Lorence, Richard
Machine element or mechanism
Mechanical movements
Rotary to rotary
74 22R, 74 84R, 74393, B23Q 1700
Patent
active
051598469
ABSTRACT:
An apparatus for rotatably moving and positioning an indexing table is disclosed. The apparatus of the present invention allows an indexing table to be quickly rotated between a plurality of index positions to within an accuracy of less than 0.001 inches on a repeated basis. Further, the apparatus has no looseness or physical separation between motion transmission elements while at or near each index position that would otherwise allow for externally induced movement of the indexing table. While at or near each index position, a first side of the cogs of a first planetary gear is kept in continual contact with the first side of the cogs of a main gear, and the second side of the cogs of a second gear is kept in continual contact with the second side of the cogs of a main gear. Also, a first interfacing portion of a first rotating drive mechanism is kept in continual contact with a first interfacing surface on the indexing table, and a second interfacing portion of a second rotating drive mechanism is in continual contact with a second interfacing surface on the indexing table. Thus, a drive arrangement is achieved that can drive the indexing table rotationally in either of two directions without any physical lag or looseness due to gear backlash while the indexing table is at or near each index position.
REFERENCES:
patent: 2775128 (1956-12-01), Young
patent: 2784612 (1957-03-01), Liska
patent: 2788673 (1957-04-01), Liska
patent: 2868032 (1959-01-01), Miller
patent: 4075911 (1978-02-01), Brems
patent: 4512214 (1985-04-01), Surman
patent: 4528860 (1985-07-01), Barr
Hewson Donald E.
Lorence Richard
Trousdell William O.
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