| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent a stacking collapse by an inexpensive constitution when stacking sheets astride a plurality of stack trays or taking out the sheets stacked astride the stack trays. <P>SOLUTION: When the sheets are detected on at least one of the stack trays by each existing sheet presence or absence sensor provided individually on two stack trays when supplying power, stacking of the sheets is inhibited on both of the two stack trays. When a take-out operation of the stacked sheets on either one of the stack trays is requested, both the stack trays are simultaneously elevated and lowered to be moved to sheet take-out positions. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
