| 摘要 |
PURPOSE:To perform fixing and releasing of a printing sheet while fixing pressure is kept constant by providing a second electromagnet on the side of a sheet fixing device on the opposite side from a first electromagnet provided on the side of a rotary roller, and switching polarity direction of the second electromagnet to positive or negative relative to the first electromagnet. CONSTITUTION:An electromagnet 4 is provided on the side of a rotary roller 1, and an electromagnet 5 is provided through a column 3 on opposite side of the electromagnet 4 on the side of a printing sheet fixing device 2 for pressing a printing sheet against the roller 1. Both electromagnets 4, 5 are then energized by DC power supply 7, and polarity of the electromagnet 5 is switched relative to the electromagnet 4 by an interlocking switch 6. Fixing ans releasing of the printing sheet can thus be performed by the interlocking switch 6, and pressure for fixing the printing sheet can be kept constant. |
