Apparatus for tracking belt for abrasive grinding machine

Details Apparatus for tracking belt for abrasive grinding machine Apparatus for tracking belt for abrasive grinding machine

1981-01-27

1983-01-25

Whitehead, Harold D.

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

B24B 2118

Patent

active

043696015

ABSTRACT:
The invention is directed to apparatus for controlling the lateral tracking movement of a wide abrasive belt back and forth over back supporting rollers. The apparatus is employed in the grinding head of an abrasive grinding machine in which the endless abrasive belt is movably carried by at least two spaced rollers. The upper roller is rotatably mounted in a cradle that pivots within the grinding head about an axis perpendicular to the roller axis and passing through the roller midpoint. Pivotal swinging of the cradle about this axis, as effected by opposed pneumatic actuators, causes the abrasive belt to track back and forth over the rollers. The tracking movement is cyclically controlled by a photodetector that cooperates with a solenoid valve to alternately actuate the pneumatic actuators. The photodetector comprises a radiation source generating a beam of radiated energy and a detector having a radiation detecting view field, the source and detector being disposed so that the radiation beam and view field intersect in a predetermined region. The photodetector is protectively disposed between the abrasive belt flights and carried so that the predetermined region may be traversed by one edge of the abrasive belt to control the solenoid valve.

REFERENCES:
patent: 3745717 (1973-07-01), Robinson
patent: 4187645 (1980-02-01), Lind

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