Sidley & Austin
Vibration reducer for transfer apparatuses
 This invention aims at reducing the vibration occurring during a motion of a vacuum transfer apparatus in a transfer press, and preventing the misfeeding of a workpiece. To achieve this object, accelerometers (30, 32) are set on one of lift bars (1) and a crossbar (21) laid laterally on a crossbar carrier (20) on each of right and left lift bars (1), and they are connected to a controller (34) through integrators (31, 33). An actuator (10) is provided on a drive rod (8) via which a lift lever (7) and a lift box (3) are connected together, and a hydraulic servo-valve (11) and the controller (34) are connected to each other through a servo-amplifier (35). The controller (34) is adapted to determine, moment by moment, a control input into the actuator (10) on the basis of measurement amounts of vibration from the accelerometers (30, 32) and the dynamic characteristics of the crossbar (21), and to operate the actuator (10) every time the control input is determined, whereby the vibration of a transfer apparatus is reduced. 
Komatsu Ltd.
B B B B
B21D B21D B21D B21D
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Shinji Hiroyuki Naoyuki Hideki Kenji
Mitsuta Ito Kanayama Tsuji Nishida