Electricity: motive power systems – Plural – diverse or diversely controlled electric motors – Work and feed motors
Patent
1975-07-10
1977-06-21
Schaefer, Robert K.
Electricity: motive power systems
Plural, diverse or diversely controlled electric motors
Work and feed motors
318433, G05B 1924
Patent
active
040314375
ABSTRACT:
A control system for a cutting machine is disclosed in which the relative motion between a cutting tool, supported by a cutting motor, and the material to be cut is controlled by a feed motor. The cutting motor load level is continuously monitored and used to derive a load level signal which is related to the cutting motor load level and a desired cutting load level. The feed motor's forward speed is controlled to increase at a selected fixed rate until the cutting motor load level is substantially equal to the desired cutting load level. Whenever the cutting motor load level increases above the desired cutting load level, representing an overload condition, the speed of the feed motor in the forward direction is reduced at the rate of increase of the overload condition. If the cutting motor load level exceeds a threshold load level, the feed motor is driven in a reverse direction at a speed which increases or decreases at a rate related to the rate at which the cutting motor load level increases above or decreases toward said threshold load level.
REFERENCES:
patent: 3633081 (1972-01-01), Weber et al.
patent: 3789279 (1974-01-01), Dempsey et al.
patent: 3896360 (1975-07-01), Meyer et al.
Dempsey Edward Justin
Kent David Earl
Concrete Cutting Equipment Inc.
Feldhaus John J.
Schaefer Robert K.
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