Patent ID: 7272335

Claim:
An image forming device, comprising: a main unit having a first feed roller and being configured to supply paper from a paper supply cassette to a feeding unit; a bypass unit having a second feed roller and being configured to supply paper from an openable and closable manual feed tray; an open/close switch being configured to detect the opening and closing of the manual feed tray; and a first power supply control unit being configured to supply a specific power to the bypass unit to operate the second feed roller only when the open/close switch detects that the manual feed tray is open; a second power supply control unit being configured to supply a specific electrical power to the main unit; a control unit being configured to receive a signal from the open/close switch and to turn off power to the first power supply control unit and to turn on power to the second supply control unit when the open/close switch detects that the manual feed tray is closed; a DC power supply being connected to the first and second power supply control units; and a power switch unit being configured to receive a signal from the open/close switch and having two switches to allow power to be transmitted from an AC power supply to the DC power supply.