Printer sheet discharge method

• US 5,779,234 A
• Filed: 05/24/1996
• Issued: 07/14/1998
• Est. Priority Date: 05/24/1995
• Status: Expired due to Term

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Akahane, Takashi, Hayashi, Shigeki, Tomii, Tsuyoshi
• Primary Examiner(s): Milef, Boris
• Application Number:
  US08/653,163
• Time in Patent Office: 781 Days
• Field of Search: 271/225, 271/188, 271/184, 271/902, 271/3.14, 271/119, 271/3.19, 271/3.2
• US Class Current: 271/3.2
• CPC Class Codes: B41J 13/106 for the sheet output section
• CPC Class Codes: B65H 2601/251 Smearing
• CPC Class Codes: Y10S 271/902 Reverse direction of sheet movement

Abstract

A method for discharging a sheet from a printer that includes feeding a first sheet from a sheet tray, conveying the sheet by the force applied by the driving roller until a leading edge of the first sheet contacts the trailing edge of a second sheet, thereby urging the second sheet in the feed direction such that the second sheet is no longer supported by supporting portions, and reversing the direction of the first sheet by reversing the rotation of the driving roller.

Claims

1. A method for discharging at least two sheets from a printer, comprising the steps of:

feeding a first sheet, having a leading edge and a trailing edge, in a feed direction through a feed path and supporting the first sheet in the feed path with a support structure;

feeding a second sheet, having a leading edge and a trailing edge, in the feed direction through the feed path and causing the leading edge of said second sheet to contact the trailing edge of said first sheet to urge said first sheet forward in the feed direction and then feeding said second sheet in a direction opposite from the feed direction, to cause the first sheet to become unsupported by the support structure and to be disengaged from the second sheet.

2. A method for discharging at least two sheets, comprising the steps of:

feeding a first sheet, having a leading edge and a trailing edge, from a sheet tray in a feed direction through a feed path to a first position and supporting said first sheet in the feed path with a support structure;

feeding a second sheet in the feed direction by rotating a driving roller in a rotating direction to a second position and causing a leading edge of said second sheet to contact a trailing edge of said first sheet to urge said first sheet forward in the feed direction and then feeding said second sheet in a direction opposite from the feed direction to a third position by rotating said driving roller in a direction opposite to the rotating direction to cause said first sheet to become unsupported by the support structure and to be disengaged from said second sheet.

3. The method of claim 2, comprising the steps of:

printing upon said second sheet as said second sheet is conveyed through a print region of the feed path prior to contacting said trailing edge of said first sheet; and

after the second sheet is fed to the third position, feeding said second sheet in the feed direction to the second position by rotating said driving roller in the rotating direction.

4. The method of claim 2, wherein the feeding of said first sheet from said sheet tray in the feed direction is performed by rotating a sheet feed roller positioned to be in contact with said first sheet.

5. The method of claim 4, comprising the steps of:

feeding said second sheet from said sheet tray in the feed direction by bringing said sheet feed roller in contact with said second sheet disposed in said sheet tray and rotating said sheet feed roller; and

disengaging said sheet feed roller from contact with a third sheet disposed in said sheet tray prior to feeding said second sheet to the third position.

6. The method of claim 5, wherein said sheet feed roller is disengaged from said third sheet by moving said sheet feed roller away from said second sheet tray.

7. The method of claim 6, comprising the step of

after the second sheet is fed to the third position, feeding said second sheet in the feed direction to the second position by rotating said driving roller in the rotating direction.

8. The method of claim 4, wherein said sheet feed roller has a D-shaped cross section including a straight face and an arcuate face.

9. The method of claim 8, wherein said sheet feed roller feeds said second sheet from said sheet tray by contacting said second sheet with said arcuate face.

10. The method of claim 5, wherein said sheet feed roller has a D-shaped cross section including a straight face and an arcuate face, and wherein the step of disengaging said feed roller from said third sheet disposed in said sheet tray is performed by bringing said straight face of said sheet feed roller into a facing relationship with said sheet tray.

11. The method of claim 10, comprising the step of, after the second sheet is feed to the third position, feeding said second sheet in the feed direction to the second position.

12. The method of claim 10, wherein said sheet feed roller feeds said second sheet from said sheet tray by contacting said second sheet with said arcuate face.