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Position indicator for a piston controlled robot part

  • US 5,201,838 A
  • Filed: 05/20/1992
  • Issued: 04/13/1993
  • Est. Priority Date: 09/05/1989
  • Status: Expired due to Term
First Claim
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1. A piston-cylinder assembly comprising a piston (1) capable of axially sliding in a cylinder (2), at least one permanent magnet (3) which is mounted as one piece with the piston (1), one or more Hall effect linear magnetic sensors (11, 15) mounted on the cylinder (2), said sensors being responsive to magnetic field of said permanent magnet (3) and delivering signals corresponding to positions of said piston (1) in the cylinder (2), a programmable control device (12), an automaton (31) which controls a robot according to the position of the piston (1) in the cylinder (2), a microcontroller (16) having input ports (18, 19, 20) respectively connected to said sensors (11, 15) and at least one output port (21) connected, via a digital link to said automaton (31), said control device (12) having at least a memory wherein data calculated by said control device (12) are stored or received from the automaton (31), said data being representative of predetermined positions of the piston (1) in said cylinder (2), said control device (12) supplying validation signals to the automaton, said validation signals being in a first state when the piston (1) stops in a position in which the signals delivered by the sensors (11, 15) correspond to data that has been previously stored in the control device memory, and being in a second state when the piston (1) stops in a second position in which the signals delivered by the sensors (11, 15) do not correspond to data previously stored in the control device memory.

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