Browse Prior Art Database

Carriage Position System

IP.com Disclosure Number: IPCOM000047481D
Original Publication Date: 1983-Nov-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Mundye, PA: AUTHOR [+2]

Abstract

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 [*].

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Carriage Position System

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 [*]. In order to measure and control the position of the carriage, coarse and fine position measurement systems are provided. As shown in the side and plan views of Figs. 1 and 2, the coarse system divides the track into zones whose boundaries are indicated by dotted lines 15. Each zone is identified by coded flags 16 which are read by means of an optical flag reader 17 mounted on the carriage. According to the system of coding, one flag changes at each boundary 15. Within each zone, fine position is measured by means of an electromagnetic waveguide position transducer system in which a microwave source transmits a reference microwave down a waveguide. This microwave is reflected by ...