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US 6,237,910 B1Granted
Sheet processing apparatus provided with sheet sensor and image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorWataru Kawata
Life of this patent
Estimating the term…
Abstract
A sheet processing apparatus has a sheet stacking tray supported for upward and downward movement, a lifting/lowering unit for lifting and lowering the sheet stacking tray, a first sensor for sensing the uppermost surface position of a batch of sheets on the stacking tray and lowering the stacking tray a prescribed amount through the lifting/lowering unit, and a second sensor for sensing that the batch of sheets on the stacking tray is partly drawn out and lifting the stacking tray through the lifting/lowering means to thereby return the stacking tray to a position proper to discharge sheets.
Claims29
A sheet processing apparatus, comprising:
- sheet stacking tray supported for upward and downward movement;
- lifting/lowering means for lifting upward and lowering downward said sheet stacking tray;
- first sensor means for sensing a position of an uppermost surface of a batch of sheets on said stacking tray and for moving said stacking tray in order that the position of said uppermost surface of a batch of sheets is lower than and does not reach to the detecting position of said first sensor means by control of said lifting/lowering means;
- and
- second sensor means for sensing that the batch of sheets on said sheet tray is partly drawn out and for moving said sheet stacking tray by control of said lifting/lowering means to thereby return said sheet stacking tray to a position proper to discharge sheets.
2 more elements
A sheet processing apparatus, comprising:
- a sheet stacking tray supported for upward and downward movement;
- lifting/lowering means for lifting upward and lowering downward said sheet stacking tray;
- first sensor means for sensing a position of an uppermost surface of a batch of sheets on said stacking tray and for moving said sheet stacking tray in order that the position of said uppermost surface of a batch of sheets is lower than and does not reach the detecting position of said first sensor means by control of said lifting/lowering means;
- and
- second sensor means for sensing that the batch of sheets is placed on said sheet stack means and for moving said sheet stacking tray through said lifting/lowering means to thereby return said sheet stacking tray to a position proper to discharge sheets.
2 more elements
An image forming apparatus, comprising:
- image forming means for forming an image on a sheet and discharging the sheet to a sheet processing apparatus, the sheet processing apparatus comprising:
- a sheet stacking tray supported for an upward and downward movement;
- lifting/lowering means for lifting upward and lowering downward said sheet stacking tray;
- first sensor means for sensing a position of an uppermost surface of a batch of sheets on said stacking tray and for moving said stacking tray in order that the position of said uppermost surface of a batch of sheets is lower than and does not reach to the detecting position of said first sensor means by control of said lifting/lowering means;
- and
- second sensor means for sensing that the batch of sheets on said sheet tray is partly drawn out and for moving said sheet stacking tray by control of said lifting/lowering means to thereby return said sheet stacking tray to a position proper to discharge sheets.
3 more elements
An image forming apparatus, comprising:
- image forming means for forming an image on a sheet and discharging the sheet to a sheet processing apparatus, the sheet processing apparatus comprising:
- a sheet stacking tray supported for upward and downward movement;
- lifting/lowering means for lifting the upward and lowering downward said sheet stacking tray;
- first sensor means for sensing a position of an uppermost surface of a batch of sheets on said stacking tray and for moving said stacking tray in order that the position of said uppermost surface of a batch of sheets is lower than and does not reach to the detecting position of said first sensor means by control of said lifting/lowering means;
- and
- second sensor means for sensing that the batch of sheets on said sheet tray is partly drawn out and for moving said sheet stacking tray by control of said lifting/lowering means to thereby return said sheet stacking tray to a position proper to discharge sheets;
- wherein said first sensor means and said second sensor means are each a light transparent type sensor having a light emitting unit and light receiving unit;
- and
- wherein the light receiving unit of said second sensor means is disposed approximately below the light receiving unit of said first sensor means in a direction substantially perpendicular to said first sensor.
6 more elements
An image forming apparatus, comprising:
- image forming means for forming an image on a sheet and discharging the sheet to a sheet processing apparatus, the sheet processing apparatus comprising:
- a sheet stacking tray supported for upward and downward movement;
- lifting/lowering means for lifting upward and lowering downward said sheet stacking tray;
- first sensor means for sensing a position of an uppermost surface of a batch of sheets on said stacking tray and for moving said sheet stacking tray in order that the position of said uppermost surface of a batch of sheets is lower than and does not reach to the detecting position of said first sensor means by control of said lifting/lowering means;
- and
- second sensor means forming an optical axis which intersects a plane on which the batch of sheets is stacked for sensing that the batch of sheets is placed on said sheet stack means for moving said sheet stacking tray by control of said lifting/lowering means to thereby return said sheet stacking tray to a position proper to discharge sheets.
3 more elements
Dependencies are inferred from the claim text.