Thermoforming machine with linear recirculation of sheet holding frames
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United States of America Patent
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Sep 24, 2002
Issued Date -
N/A
app pub date -
Sep 10, 1999
filing date -
Dec 8, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A thermoforming machine utilizes two clamping frames to advance cut sheets through heating and forming stations, with the clamping frames returned via an overhead path above the oven in the heating station. Pneumatic cylinders arranged about the inner perimeter of the frames are operated to grip the sheet and release the sheets, which are pressurized and released via fluid connections established when the frames are lifted from a transfer bar structure at the loading and forming stations. The clamping frames have pivoted end sections which are engaged by extendible gear posts at the forming station to bend the clamped sheet into greater conformity with the tooling shape prior to forming.
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