Printing – Processes – With heating or cooling
Patent
1995-04-03
1997-04-01
Eickholt, Eugene H.
Printing
Processes
With heating or cooling
219216, 219388, 34634, 34242, 34 86, 34572, B41J 302
Patent
active
056156146
ABSTRACT:
A thermography machine to be subject in use to periods of waiting for supplies of sheets to be processed is provided with a control system whereby at any time the conditions of a normal "run" mode of operation can be switched to or from operations in a "standby" mode, with retention of a high heating chamber temperature in readiness for processing sheets yet with important reductions of heat losses from the heating chamber, so reduced infusion of heat into the ambient workshop air, and decreases of power consumption and of wear and deterioration in the driving of the conveyors and several other components of the machine. Heating chamber temperature and wattage output of the heaters are controlled over a wide range of A.C. supply line voltages in both modes of operation by supplying current to the heaters from a thermocouple heat control coupled with a proportional voltage control. Heat losses and power usage during standby periods are greatly reduced by curtailing the speed of driving of the conveyors to an abnormally low rate, and further by disposing insulating doors across the passageways for sheets transport at the ends of the heating chamber. An "automatic" mode of operation of the machine is also provided, so that the switchings between its "run" mode and its "standby" mode of operation will be effected in response to cessations and resumptions, respectively, of operating conditions of a sheet-fed printing press that delivers sheets imprinted for processing in the thermography machine.
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Eickholt Eugene H.
Van Pelt Equipment Corporation
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