Apparatus for sensing the temperature of a thermoplastic sheet in a differential pressure forming machine
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United States of America Patent
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Nov 23, 1993
Grant Date -
N/A
app pub date -
Nov 5, 1991
filing date -
Nov 5, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Apparatus the temperature of a thermoplastic sheet including a hollow wave guide having a bend therein, for receiving and transmitting infrared energy emitted by the sheet between a sheet heater at a sheet forming station and differential pressure forming apparatus at a forming station. One end of the hollow channel is mounted adjacent the sheet. At the opposite end of the hollow channel, a plurality of infrared energy sensors is mounted for sensing the infrared energy. Infrared sensors include mechanism for converting the infrared energy to electrical energy to operate a control system which controls the level of electrical power to the heater and thus controls the temperature of the sheet.
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