Automatic level adjusting means for sustaining the crossrail used in double housing type machine tools in its accurate horizontal position

Claim 1

An automatic crossrail level adjusting mechanism for use in double housing type machine tools comprising a pair of electroscales, a pair of electrosensing elements for detecting the crossrail losing its horizontal balance, an input signal transfer circuit connected to said electrosensing elements, an output member connected to said circuit, a compensating mechanical means coupled with said output member; said input signal transfer circuit including a pair of detector circuits connected to each of said electrosensing elements, a pair of signal shaping circuits connected to each of said detector circuits and producing a shaped output pulse when energized, a phase discriminator for detecting phase difference, a low-pass filter for converting said phase difference into DC level, at least one clamp circuits as a DC restorer which produces the output corresponding to said phase difference; said output member having a servomotor for level compensating, a SCR drive and a servoamplifier; said compensating mechanical means having a differential gear means.