Method and apparatus for pressing glass cathode ray tube faceplates
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United States of America Patent
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Feb 9, 1988
Grant Date -
N/A
app pub date -
Jul 30, 1986
filing date -
Jul 30, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method and apparatus for pressing glass TV tube faceplates employing a microprocessor controlled ram and plunger operated with open loop position based speed control at relatively high rates of motion when the plunger is not in critical contact with the glass, at uniform speed as the plunger enters the glass and at closed loop pressure control after the viewing region of the cavity for the faceplate between plunger and mold has been filled out at uniform plunger pressing speed. Pressure control is employed to ramp pressure down to a pressing dwell pressure and maintain that pressure.
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