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US 4,723,977 AGranted
Electronic servo control of glass gob distribution
AssigneeEmhart Industries, Inc.
InventorsMarty J. Grant, George T. Peterson, Robert P. Andersen
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AssigneeEmhart Industries, Inc.
InventorsMarty J. Grant, George T. Peterson, Robert P. Andersen
Estimating the term…
Method and apparatus for electronically controlling a servo motor drive for glass gob distribution apparatus, to provide accurate high speed motion of one or more scoops. At the set-up stage, the operator adjusts the scoop position with respect to each trough to align scoop and trough in a straight line. During automatic operation, upon receipt of a MOVE command a motion control computer provides digital output signals to move the scoops through a prescribed motion profile, such profile having suitable characteristics to move the scoops over various distances without vibration or overshoot. A digitalized cubic-parabolic-cubic (CPC) curve or similar cam profile is scaled to the amplitude and direction of the required motion, and the motion profile computer outputs command signals on a point-by-point basis over the time span of this stored motion profile. Such time span is designed to provide sufficient dwell time to allow the gobs to traverse the scoops. This motion sequence is reiterated for each successive receiving trough according to the prescribed firing order, using the prior target location to define the starting location of the succeeding scaled motion profile.
A method for controlling the motion of a glass gob distribution device, such device including at least one scoop which is moveable into alignment with a plurality of receiving troughs, a mechanism for moving the scoop driven by a servo-motor, a motion controller for providing a position signal for the servo-motor in accordance with a digital position value, said motion controller including memory means for storing digital position values representing scoop locations proximate each of the troughs, comprising the steps of
A method for controlling the motion of glass gob distribution apparatus, such apparatus being of the type including at least one scoop which is moveable into alignment with a plurality of receiving throughs, a mechanism for moving the scoop driven by a servo motor, and a motion controller for providing a position signal for the servo motor in accordance with digital position values, said motion controller containing a digitalized motion profile curve comprising a sequence of scoop displacement points and timing means for periodically, sequentially reading the sequence of scoop displacement points to produce the digital position values;
Apparatus for controlling the motion of glass god distribution system, such system including at least one scoop which is moveable into alignment with a plurality of receiving troughs, a mechanism for moving the scoop driven by a servo motor, and a motion controller for providing position signals for the servo motor in accordance with stored digital position values, said motion controller including,
Dependencies are inferred from the claim text.