| 摘要 |
PROBLEM TO BE SOLVED: To improve safety by detecting short-circuiting of a heating element in a sheet heating device and surely stopping the device. SOLUTION: This sheet heating device is provided with an unbalanced electric current detecting means 22 detecting an unbalanced state of input/output electric current of a first heating wire 15 or a second heating wire 16, and is stopped by forcibly opening an electric current breaking means 18, by determining generation of short-circuiting between two heating wires 15, 16 when the unbalance is generated in inflow/outflow electric current. COPYRIGHT: (C)2007,JPO&INPIT
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