Work holders – Holder mounted for movement – With plural means for changing holder positions
Patent
1987-06-24
1988-08-16
Watson, Robert C.
Work holders
Holder mounted for movement
With plural means for changing holder positions
B23Q 104
Patent
active
047638869
ABSTRACT:
The XY-positioning table of the present invention includes a base, an X-axis-movable table and a Y-axis-movable table, as well as, X-axis, and Y-axis driving means, attached to said base: where the X-axis-movable table is provided with an X-axis nut to engage with a threaded shaft driven by said X-axis driving means; while in the interior cavity or space of the X-axis-movable table is provided a Y-axis nut capable of engaging with another threaded shaft driven by the Y-axis driving means with auxiliary bearings being provided between the Y-axis nut box and the Y-axis table for effecting X-axis rectilinear-motion, thus realizing a smooth and accurate relative X-Y directional movement between the X-axis and Y-axis movable tables and the bed. Further advantages of the present XY-positioning table are: since the Y-axis driving-mechanism is accomodated almost within the interior space or cavity of the X-axis table, the present XY-positioning table can be made smaller in size, while as the weight of the Y-axis driving-mechanism is not provided on the X-axis-movable table, the inertial force taking place upon the movement of the table can be minimized and, accordingly, the present XY-positioning table can insure highly accurate indexing or positioning of working tools relative to workpieces. Further, the provision of bearing means for effecting rectilinear motion between the X-axis-movable table and the Y-axis-movable table, in association with X-axis and Y-axis driving-mechanisms gives rise to, in the present XY-positioning table, not only a greater load resisting capacity but an accurate and stable indexing or positioning performance for an extended long period of operating time.
REFERENCES:
patent: 4610442 (1986-09-01), Oku et al.
Nippon Thompson Co. Ltd.
Watson Robert C.
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