Sheet feeder and image formation apparatus
AssigneeFuji Xerox Co., Ltd.
InventorHidekazu Amamoto
Life of this patent
Estimating the term…
Abstract
A sheet feeder has a sheet tray for storing sheets, a moving bottom plate being disposed on the bottom of the sheet tray for stacking the sheets, the moving bottom plate being elastically urged by an elastic member, a sheet delivery unit having a sheet delivery member being placed in contact with the sheet stored in the sheet tray for delivering the sheets in order from the top through the sheet delivery member, and an interlock mechanism for regulating a move of the moving bottom plate in response to the sheet stack amount so as to keep constant the contact relationship between the top sheet position of the sheets stored in the sheet tray and the sheet delivery member.
Claims19
A sheet feeder comprising:
- a sheet tray for storing sheets;
- a moving bottom plate being disposed on a bottom of the sheet tray for stacking the sheets;
- an elastic member for elastically urging the moving bottom plate;
- a sheet delivery unit having a sheet delivery member being placed in contact with the sheet stored in the sheet tray for delivering the sheets in order from the top through the sheet delivery member;
- and
- an interlock mechanism for regulating a move of the moving bottom plate in response to the sheet stack amount so as to keep substantially constant the contact relationship between the top sheet position of the sheets stored in the sheet tray and the sheet delivery member.
A sheet feeder comprising:
- a moving bottom plate for stacking a plurality of sheets, the moving bottom plate being urged upward;
- a sheet delivery unit having a sheet delivery member being placed in contact with the sheet top face for delivering the sheets in order from the top through the sheet delivery member;
- a constraint mechanism for constraining an upward move of the moving bottom plate urged upward;
- and
- a release mechanism for releasing the constraining force of the constraint mechanism between the instant at which the top sheet position of the sheets stacked on the moving bottom plate decreases exceeding a predetermined position and the instant at which the top sheet position is restored to the predetermined position or higher.
A sheet feeder comprising:
- a moving bottom plate for stacking a plurality of sheets, the moving bottom plate being urged upward;
- a sheet delivery unit having a sheet delivery member being placed in contact with the sheet top face for delivering the sheets in order from the top through the sheet delivery member;
- a constraint mechanism for constraining an upward move of the moving bottom plate urged upward;
- and
- a constraint control mechanism for releasing the constraint of the moving bottom plate by the constraint mechanism in association with the sheet delivery member arriving at a first position with a decrease in the number of the sheets and starting the constraint of the moving bottom plate by the constraint mechanism in association with the sheet delivery member arriving at a second position above the first position.
A sheet feeder comprising:
- a sheet sending member;
- a moving bottom plate for stacking a plurality of sheets, the moving bottom plate being elastically urged to the side of the sheet sending member brought into contact with the top sheet of the sheets;
- a sheet delivery unit having the sheet delivery member for delivering the top sheet in a predetermined direction, the sheet delivery unit being placed facing the top sheet;
- and
- a restoration mechanism, if the position of the top sheet is moved to the side of the moving bottom plate beyond a predetermined position as the sheet delivery unit delivers the top sheets in order, the restoration mechanism for restoring the position of the top sheet beyond the predetermined position by the elastic urging force.
Dependencies are inferred from the claim text.