Encoder for monitoring bidirectional motion

H - Electricity – 02 – K

Patent

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Details

318/18, 354/77,

H02K 37/00 (2006.01) H02P 8/00 (2006.01) H02P 8/20 (2006.01)

Patent

CA 1138926

ENCODER FOR MONITORING BIDIRECTIONAL MOTION ABSTRACT OF THE DISCLOSURE An encoder is provided for monitoring bidirectional motion, particularly bidirectional rotation in a closed loop step motor system. The present disclosure involves a rotational encoder having a plurality of indicia at fixed positions with respect to each other, means for rotating said indicia about an axis and means for sensing the indicia positioned along the path of rotation of said indicia. In the present apparatus, each of a plurality of said indicia has a first edge radial to said axis and trav- ersing the path of rotation and a second edge non- radial to the axis also traversing the path of rotation and the apparatus further includes means for moving the sensing means so that the position of the sensing means may be adjusted with respect to the first edges which are the leading edges when said indicia are rotated in one direction and to the second edges which are the leading edges when the indicia are rotated in the opposite direction. The means for moving the sensing means include means for moving said sensing means radial to said axis in order to vary the position of the sensing means with respect to the second edges and means for moving the sensing means in an arc concentric with the path of rotation in order to vary the position of the sensing means with respect to the first edges. AT9-78-025

349753

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