Apparatus for detecting limits of travel

Details Apparatus for detecting limits of travel Apparatus for detecting limits of travel

1977-07-22

1979-01-09

Aegerter, Richard E.

Geometrical instruments

Miscellaneous

Light direction

200 47, 200161, 29 65, 90 131, H01H 1712, B23Q 500, B23Q 554

Patent

active

041331117

ABSTRACT:
A motor driven plotter has a plotting head which is translated in two coordinate directions over the work surface of a plotting table. The plotting head is mounted on a first carriage which moves in one coordinate direction and a second carriage is mounted on the first for movement in the second coordinate direction. The limits of both carriages in each coordinate direction are directed by means of a pull cord suspended in a rectangular pattern from the first carriage. A cord portion or segment is intersected and extended by a contact at each limit of travel in the coordinate directions. A switch connected to the cord produces a limit signal when the cord is extended.

REFERENCES:
patent: 2014474 (1935-09-01), Hopkins
patent: 2620256 (1952-12-01), Kerns et al.
patent: 2640131 (1953-05-01), Cole
patent: 2843689 (1958-07-01), Roberts
patent: 3738007 (1973-06-01), Tuskos

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