Electricity: motive power systems – Positional servo systems – Program- or pattern-controlled systems
Patent
1973-09-27
1976-09-07
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Program- or pattern-controlled systems
318603, 318621, G05B 1924
Patent
active
039796531
ABSTRACT:
A velocity-change control system and method are described for numerical control machines enabling the programming of higher speeds of operation for curved and straight-line paths while reducing positional errors and maintaining the acceleration and deceleration at a prescribed value. The system includes a hardwired digital logic unit for each axis interposed between the axis path generator and the axis drive. The input to each axis unit corresponds to the programmed path and velocity and is in the form of electrical pulses each representing a small fixed increment of motion for the particular axis. The output is in the form of pulses representing the same resolution of motion as the input pulses but providing an output trace which lags the input trace by a distance related to the path velocity. This lag distance is continuously stored in the control system, and is used to smooth out velocity step inputs so the outputs will be smooth accelerations and decelerations at rates which may be prescribed to be well within the axes drive response capabilities or the drive train stress limits required for reasonable mechanical wear rates.
REFERENCES:
patent: 2954514 (1960-09-01), Hemstreet
patent: 3539897 (1970-11-01), Sommeria
patent: 3668500 (1972-06-01), Kosem
patent: 3781626 (1973-12-01), Kubo et al.
patent: 3790764 (1974-02-01), Rouxel et al.
patent: 3792333 (1974-02-01), Cutler
Barish Benjamin J.
Dobeck B.
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