Heatable roll

Electric heating – Heating devices – Combined with container – enclosure – or support for material...

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Details

219471, H05B 102

Patent

active

045608601

ABSTRACT:
A heatable roll has a plurality of annular, preferably electrical, heating elements (13) distributed internally along the length of the roll body (10,11). A slip-ring arrangement (22) rotating with the roll connects the heating elements with a heating current source (20) located outside the roll. A heating output setting device (9) arranged inside the roll is provided for each heating element and is connected to a signal transmitting arrangement (31 to 34). A control signal is formed for each heating element in a control center (21) located outside the roll, and is supplied to a parallel-serial converter (31). This converter forms one serial signal sequence from the plurality of parallel control signals, and this sequence is supplied, for example by means of slip-rings (22a), to a serial-parallel converter (34) located in the roll. This converter converts the serial signal sequence back again into parallel control signals which are supplied to the individual heating output setting devices.

REFERENCES:
patent: 2777931 (1957-01-01), Bimdegaard et al.
patent: 3177799 (1965-04-01), Justus et al.
patent: 3182587 (1965-05-01), Woodhall
patent: 3376407 (1968-04-01), Wagner
patent: 3624353 (1971-11-01), Bjorklund
patent: 4304985 (1981-12-01), Miller
patent: 4307501 (1981-12-01), Ahrweiler
patent: 4384514 (1983-05-01), Larive et al.
patent: 4425489 (1984-01-01), Pav et al.

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