Linear drive

Details Linear drive Linear drive

1987-12-18

1991-05-21

Look, Edward K.

Motors: expansible chamber type

Working member position feedback to motive fluid control

Electrical input and feedback signal means

91459, 91465, 92137, 92163, F15B 902, F15B 1500

Patent

active

050165194

ABSTRACT:
A modular handling system is assembled from a plurality of linear drive, rotary drive, or tool modules. The linear drive used as a cylinder block with a cylindrical bore therein and cylinder heads sealing off the cylindrical bore. A pneumatically actuated piston travels within the cylindrical bore. A carriage runs on the cylinder block and is connected with the piston by means of a flexible belt attached to both the piston and the carriage and deflected by deflection rollers mounted on the cylinder heads. Cartridge-type valves are integrated into both cylinder heads for controlling displacement of the piston. One of the cartridge valves is made as a pressure-servo-valve allowing linear control of valve output pressure vs. valve operating current. The cartridge valve integrated into the opposite cylinder head may be either another pressure-servo-valve or a displacement-servo-valve allowing linear control of valve spool displacement vs. valve operating current. Thus, a stable operating point is achieved in the intersection of the characteristic curves of both valves. Further, a third or more additional valves are integrated into the cylinder heads for controlling additional modules, particularly tools attached directly on the front end side of the cylinder heads.

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