Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1980-09-08
1982-08-17
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
29271, G01D 534
Patent
active
043451497
ABSTRACT:
The mounting member portion carrying the light source in an optical encoder assembly is properly centered on a motor casing with respect to the motor shaft by a centering fixture in the form of a disc-shaped element. This disc-shaped element has a central bore of diameter corresponding to the diameter of the motor shaft and an annular peripheral downwardly depending lip at a precise radial distance from the geometrical center of its bore. This radial distance corresponds precisely to the radial distance between the geometrical center of the mounting member and its circular periphery such that the disc-shaped element can overlie the mounting member with its lip engaged about the circular periphery of the mounting member and its central bore receiving the motor shaft. The geometry is such that the mounting member is necessarily held in a precise concentric relationship with respect to the motor shaft by means of the centering fixture in the form of the disc-shaped element. The mounting member can then be secured to the motor casing itself and thereafter the centering fixture removed and the remaining components assembled.
REFERENCES:
patent: 3900732 (1975-08-01), Costales
patent: 4209692 (1980-06-01), Hudspeth
Nelms David C.
Pastoriza Ralph B.
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