Work holders – Holder mounted for movement – With plural means for changing holder positions
Patent
1975-12-01
1977-05-31
Smith, Al Lawrence
Work holders
Holder mounted for movement
With plural means for changing holder positions
B23Q 102
Patent
active
040265366
ABSTRACT:
A supporting system for an x-y table comprising four pairs of superimposed and interconnected upper and lower bearings arranged in a pyramidal array. More particularly, the pairs of bearings are located at the corners of a rectangle with the uppermost bearings of the pairs perpendicular to the lowermost bearings thereof, and with the uppermost bearings of the pairs offset horizontally inwardly relative to the lowermost bearings of the pairs in both the x and y directions, thereby producing the pyramidal array mentioned. With such a bearing array, the weight of the table, and any load thereon, act to preload all of the bearings so that there is zero play in both the x and y directions. Also disclosed is a drive system for an x-y table comprising two-speed x drive means for driving the table in the x directin and two-speed y drive means for driving the table in the y direction, each drive means including selectively operable high and low speed drive members. Antibacklash gearing in the x and y drive means eliminates play therein.
REFERENCES:
patent: 3124018 (1964-03-01), Gough
patent: 3143791 (1964-08-01), Lanahan et al.
patent: 3499642 (1970-03-01), Porter
patent: 3777616 (1973-12-01), Mueller
Smith Al Lawrence
Watson Robert C.
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