Portal frame controlling device, has control units for providing control signals based on actual positions of drive units, to adjust portal frame, without causing rotation of support that is at position same as that of head

摘要

The device (11) has control units (15, 17) for providing control signals (Fcont1, Fcont2) to respective drive units (2, 4), to approximate an actual position of a head (5) to a target position (xref). A compensation unit (19) has a correction control unit (25) that supplies correction signals for the respective control signals. The control units provide the control signals based on actual positions (x1, x2) of the drive units, to adjust a portal frame (1), without causing rotation of a support (3) that is at a position same as that of the head.