| 摘要 |
PROBLEM TO BE SOLVED: To provide a device and a method for monitoring a medium stack included in an image formation device. SOLUTION: This system comprises a lift plate 50 on which the stack 150 is placed, a gate disposed in the image formation device and having an opened state and a closed state, and a first flag 130, and is formed so as to monitor the medium stack included in the image formation device. The first flag 130 is installed on the lift plate 50, disposed in the gate 100, and has at least one graduation. Also, the image formation device comprises first and second states. In the first state, the graduation of the first flag 130 is positioned in the gate 100 to bring the gate 100 in an open state. In the second state, the graduation of the first flag 130 is not positioned in the gate 100 to bring the gate 100 in a closed state. COPYRIGHT: (C)2004,JPO
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