G - Physics – 05 – D
Patent
G - Physics
05
D
327/102, 154/29
G05D 23/24 (2006.01) B29C 65/02 (2006.01) B29C 65/22 (2006.01)
Patent
CA 1271815
ABSTRACT An apparatus automatically controlling the temperature of welding bands used to weld plastic films or the like comprises a dividing circuit for determining the temperature of the welding band in dependence on the out- put voltage and current of the heating circuit and a controller for controlling the output power of the heating circuit in dependence of the deviation of the determined actual temperature of the welding band from a predetermined desired value. The output voltage of the dividing circuit, which output voltage is an analog voltage representing the high-temperature resistance of the welding band, and an analog voltage representing the low-temperature resistance of the welding band, are applied as input voltages to a second dividing circuit, which generates an analog voltage representing the quotient of said two input voltages of said second dividing circuit. Said output voltage is multiplied in a multiplying circuit with the output voltage generated by an analog adder as the sum of an analog voltage representing the low-temperature at which the low- temperature resistance of the welding band has been measured and an auxiliary analog voltage, which represents a calculated auxiliary temperature. A first subtracting circuit is provided for subtracting the auxiliary voltage from the output voltage of the multiplying circuit and for generating an analog voltage which represents the actual temperature of the hot welding band. A second subtracting circuit is provided, which generates a differential voltage representing the difference between the analog voltage representing the determined actual temperature of the welding band and the analog voltage representing the predeter- mined desired temperature of the welding band and applies said differential voltage to the controller. The apparatus can simply and quickly be adjusted to match the welding band employed and in particular after a replacement of a welding band can simply and quickly be adjusted to match the possibly different dimensions and composition of the new welding band.
508479
Marek Rainer
Marks & Clerk
Windmoller & Holscher
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