Carriage Position System
Original Publication Date: 1983-Nov-01
Included in the Prior Art Database: 2005-Feb-07
The position of a carriage on a track is determined within coarse position zones by means of a fine position transducer of the type employing a microwave source and waveguide in conjunction with a magnet. In this system a curved waveguide is mounted on the carriage and has a linear portion equal to the zone length. A stationary magnet arrangement through which the waveguide passes is mounted alongside each zone. The curve in the waveguide allows the bulky microwave source to pass over rather than through the magnet arrangement. As best shown in section in Fig. 3, carriage 10 is supported for movement along a box section track 11 by bearings 12. The carriage drive is not shown but may, for example, be a linear induction motor as described in a previous article [*].