Patent ID: 8829895
Filing Date: 2014-09-09
Classification: B25J,G01D,G05B

Abstract:
1. A machine, comprising: a first member, a second member that is rotatable relative to the first member with reference to an axis, a control device, a drive, which is connected with the control device for moving the first and second members relative to one another, a Hall sensor that is connected with the control device and is arranged on the first member, and first, second and third magnets, which are arranged next to each other on a common circular trajectory on the second member such that the Hall sensor is situated in a specific position in a detection zone of the magnets during a rotation of the two members relative to one another, wherein the second magnet which is developed as the center magnet is facing towards the Hall sensor with another magnetic pole than the first and third magnets; wherein the control device is set up to control the drive as part of a reference run such that the first and second members rotate relative to one another and determine the position based upon signals originating from the Hall sensor, wherein the strength of the signal of the Hall sensor increases and therefore has a rising signal edge, as soon as the Hall sensor gets into the detection zone of the second magnet, and the strength of the signal of the Hall sensor drops and therefore has a falling signal edge, as soon as the Hall sensor leaves the detection zone of the second magnet again, the control device of which is set up to evaluate the rising and falling signal edge of the Hall sensor to determine the position.