Sheet stacking device and printing apparatus

• US 9,272,872 B2
• Filed: 02/02/2015
• Issued: 03/01/2016
• Est. Priority Date: 02/26/2014
• Status: Active Grant

• Current Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Original Assignee: Canon Ayutthaya Limited (Canon Inc.)
• Inventors: Sugiyama, Noriyuki, Saito, Hiroyuki, Asai, Yasuyuki, Ikeda, Atsushi
• Primary Examiner(s): Bollinger, David H
• Application Number:
  US14/611,506
• Publication Number:
  US 20150239702A1
• Time in Patent Office: 393 Days
• Field of Search: 271/220
• US Class Current: 1/1
• CPC Class Codes: B65H 2301/4212 of articles substantially horizontal
• CPC Class Codes: B65H 2301/42192 forming a pile of articles in zigzag fashion
• CPC Class Codes: B65H 2404/152 Arrangement of roller on a movable frame
• CPC Class Codes: B65H 2405/11151 with surface inclined upwardly in transport direction
• CPC Class Codes: B65H 2405/351 shifting transversely to transport direction, e.g. for handling stepped piles
• CPC Class Codes: B65H 2601/251 Smearing
• CPC Class Codes: B65H 2801/06 Office-type machines, e.g. photocopiers
• CPC Class Codes: B65H 31/02 with stationary end support against which pile accumulates
• CPC Class Codes: B65H 31/26 Auxiliary devices for retaining articles in the pile
• CPC Class Codes: B65H 31/34 Apparatus for squaring-up piled articles
• CPC Class Codes: B65H 31/36 Auxiliary devices for contacting each article with a front stop as it is piled
• CPC Class Codes: B65H 33/08 Displacing whole batches, e.g. forming stepped piles

Abstract

A sheet stacking device that can appropriately stack, at a fixed position, sheets that are discharged to a discharge tray, and a printing apparatus are provided. A presser member holds down, at a pressing position, the sheets stacked on the discharge tray. The presser member is moved from the pressing position to a retraction position in a period after discharging of a sheet has been started and before discharging of a succeeding sheet is started.

Claims

1. A sheet stacking device comprising:

a discharge tray configured to receive sheets that are discharged;

a presser member configured to be able to hold down the sheets stacked on the discharge tray; and

a moving unit configured to move the presser member between a pressing position at which the presser member holds down the sheets stacked on the discharge tray and a retraction position at which the presser member is separated from the discharge tray,

wherein the moving unit (a) positions the presser member at the pressing position while a sheet is discharged, and (b) moves the presser member to the retraction position from the pressing position along a stacking face of the discharge tray after discharging of the sheet is completed.

2. The sheet stacking device according to claim 1, further comprising a tray moving unit configured to move the discharge tray in a predetermined direction so as to sort sheets that are sequentially discharged, and

wherein the tray moving unit moves the presser member together with the discharge tray.

3. The sheet stacking device according to claim 1, wherein a plurality of sheets discharged sequentially are stacked on the discharge tray, and

wherein the presser member holds down a trailing edge portion of the stacked sheets from above.

4. The sheet stacking device according to claim 3, wherein the presser member holds the trailing edge portion at both sides of the sheet in a widthwise direction of the sheet.

5. The sheet stacking device according to claim 1, wherein the moving unit moves the presser member to the retraction position from the pressing position along the stacking face of the discharge tray after discharging of the sheet is completed and a part of the sheet is laid.

6. The sheet stacking device according to claim 1, wherein the presser member has a roller that contacts the sheet stacked on the discharge tray.

7. The sheet stacking device according to claim 1, wherein the presser member has a placing face on which one part of the sheet is to be laid, the placing face being inclined relative to the stacking face of the discharge tray.

8. The sheet stacking device according to claim 1, wherein the presser member has a placing face on which a part of the sheet is to be laid, the placing face being extended in parallel to the stacking face of the discharge tray.

9. The sheet stacking device according to claim 1, wherein the sheets are individually discharged.

10. A printing apparatus, which prints images on sheets, and sequentially discharges, to a sheet stacking device, the sheets on which the images are printed,

wherein the sheet stacking device comprises:

a discharge tray configured to receive sheets that are discharged;

a presser member configured to be able to hold down the sheets stacked on the discharge tray; and

a moving unit configured to move the presser member between a pressing position at which the presser member holds down the sheets stacked on the discharge tray and a retraction position at which the presser member is separated from the discharge tray,

wherein the moving unit (a) positions the presser member at the pressing position while a sheet is discharged, and (b) moves the presser member to the retraction position from the pressing position along a stacking face of the discharge tray after discharging of the sheet is completed.