US 4,548,637 AGranted

Servo-control of machine motions in manufacture of glass containers

AssigneeOwens-Illinois, Inc.

InventorPeter S. Miller

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Abstract

A servo control system and method for controlling repetitious or oscillatory motion of a member in a glass manufacturing process between predetermined points. A desired trajectory between such points is first established as a function of time, and this trajectory is then loaded into a digital electronic memory as a plurality of discrete trajectory position signals arranged in an incremental series as a function of time. Control logic, which includes a real time oscillator, periodically accesses the memory so as to sequentially select and read therefrom the incremental trajectory position signals. These incremental signals are fed as a desired position control signal to a servo amplifier, which receives a second input from a position transducer coupled to the movable member and provides an amplifier output to a servo motor and then to the member.

Claims5

Dependent claims

In a system for manufacture of glass containers, a servo system for controlling oscillatory motion of a member between predetermined end points .theta..sub.1 and .theta..sub.2, said system comprising a motor coupled to propel said member between said end points, a transducer coupled to said member to provide a signal indicative of actual member position .theta., and servo amplifier means for energizing said motor as a function of a difference between said actual position signal .theta. and a second signal .theta..sub.s (t) indicative of desired member position, means for providing said second signal .theta..sub.s (t) comprising

memory means having stored therein a sequence of signals f(t) indicative of desired motion of said member along a preselected motion trajectory between trajectory end points .theta..sub.i and .theta..sub.f, said signals being stored as incremental functions of time t,
means for electronically translating said trajectory end points .theta..sub.i and .theta..sub.f to correspond with said predetermined end points .theta..sub.1 and .theta..sub.2,
means including an oscillator for periodically accessing said memory means to provide sequential signals f(t) indicative of incremental desired position along said trajectory, and
means responsive to said sequential signals f(t) and to said electronically translating means for directing said sequential signals .theta..sub.s (t) as a function thereof to said servo amplifier means on said second input.

1 more element

Dependencies are inferred from the claim text.