Carrier device

Details Carrier device Carrier device

1995-02-07

1997-08-26

Watson, Robert C.

Work holders

Holder mounted for movement

With plural means for changing holder positions

269329, B23Q 125

Patent

active

056603819

ABSTRACT:
A device to simply control a position and an amount of rotation of a carrier and to prevent a decrease of the control accuracy upon thermal expansion of the carrier. On a base (15), a carrier (16) is slidably and at the same time rotatably supported. The carrier (16) has arms (41, 42 and 43) which are driven by a respective drive element (21, 22 and 23) for each of three axes (X, X', and Y). The drive elements of each axis (21, 22, 23) are the same distance from a reference axis which functions as the center of rotation of the carrier (16). When the carrier (16) moves in the X direction, by means of the drive elements (21 and 22), two of the arms (41 and 42) are moved by the same amount. For movement in the Y direction, the third arm (43) is moved by the third of the drive elements (23). When the carrier (16) is turned, the drive elements (21, 22 and 23) move all of the arms (41, 42 and 43) the same amount in the direction in which the carrier is turned.

REFERENCES:
patent: 4417843 (1983-11-01), Bonga
patent: 4544311 (1985-10-01), Husain
patent: 4610442 (1986-09-01), Oku et al.
patent: 4667415 (1987-05-01), Barsky
patent: 4821595 (1989-04-01), Podeschwa et al.
patent: 4948330 (1990-08-01), Nomura et al.
patent: 5031547 (1991-07-01), Hirose

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