Press machine and method for detecting top dead center thereof
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United States of America Patent
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Oct 13, 2015
Grant Date -
Oct 9, 2014
app pub date -
Jun 26, 2012
filing date -
Jul 29, 2011
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Abstract
A press machine includes a controller including a top-dead-center detector adapted to: rotate a main shaft in a predetermined direction selected from a normal rotation direction and a reverse rotation direction to place a slide at a first position displaced relative to a top dead center of the slide by a predetermined height; while outputting and counting pulses from an angle detector, rotate the main shaft in a direction opposite to the predetermined direction to move the slide to a second position located at the same height as the first position beyond the top dead center; and rotate the main shaft from the second position in the predetermined direction by an amount corresponding to a half of the counted pulses to detect the top dead center.
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