Metallic scales and method of manufacturing the same

Details Metallic scales and method of manufacturing the same Metallic scales and method of manufacturing the same

1982-03-18

1985-04-09

Albritton, C. L.

Electric heating

Metal heating

By arc

219121EM, B23K 2700

Patent

active

045103712

ABSTRACT:
A surface of a linear magnetic bar is subjected to such high density energy as a fine beam of laser rays, electrons, ions, plasma or an electric current to change permeability of portions subjected to the high density energy so as to form graduations spaced uniformly. A magnetic sensor is used to detect variation in the permeability, thus measuring movement, speed or acceleration of the scale relative to the magnetic sensor. The scale may be formed on a movable portion of a machine, for example a piston rod of a die casting machine or an injection molding machine.

REFERENCES:
patent: 2914756 (1959-11-01), Heidenhain et al.
patent: 3243692 (1966-03-01), Heissmeier et al.
patent: 3478189 (1969-11-01), Estes
patent: 4253350 (1981-10-01), Ichiyama et al.

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