US 5,688,103 A · Vibration reducer for transfer apparatuses

Abstract

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.

Claims20

Dependent claims

A workpiece transfer apparatus comprising:

a workpiece holding mechanism;
a support member for supporting said workpiece holding mechanism;
a positioning unit for movably positioning said support member;
a drive unit to effect movement of said support member;
a motion transmission mechanism extending from said drive unit to said support member;
a controllable actuator provided in said motion transmission mechanism;
at least one sensing means provided on at least one of said workpiece holding mechanism, said support member, said positioning unit, and said drive unit;
and
a controller for receiving measurement signals from said at least one sensing means, said controller being adapted to determine a damping motion control input signal on the basis of said measurement signals from said at least one sensing means, and to apply said damping motion control input signal to said actuator to operate said actuator so that vibration of the transfer apparatus is reduced.

6 more elements

Dependencies are inferred from the claim text.

Vibration reducer for transfer apparatuses

Life of this patent

Vibration reducer for transfer apparatuses

Life of this patent

Abstract

Claims20