| 摘要 |
A sheet feed device comprises: a second detection unit which detects a state of the detection switch unit whose state is switched due to the change of state of the sheet feed device; a signal conversion unit which converts a detection signal obtained in accordance with a state of the detection switch into a serial signal; a communication line which connects the first detection unit to the second detection unit; and a signal line configured to connect the first detection unit to the signal conversion unit, wherein when the sheet feed device is in a first state, the first detection unit receives information indicating the state detected by the second detection unit via the communication line, and thereby detects the change of state of the sheet feed device.
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