Printing apparatus and control method therefor

Patent metadata

Field	Value
Publication number	US-9428355-B2
Application number	US-201514722334-A
Country	US
Kind code	B2
Filing date	May 27, 2015
Priority date	Jun 4, 2014
Publication date	Aug 30, 2016
Grant date	Aug 30, 2016

Abstract

A printing apparatus has a conveyance control unit which controls conveyance of printing sheets so that a trailing edge of a preceding sheet as a printing sheet precedingly fed from the stacking unit and a leading edge of a succeeding sheet as a printing sheet succeedingly fed from the stacking unit overlap each other; and a skew correction unit which performs skew correction of the succeeding sheet while the succeeding sheet overlaps the preceding sheet by the conveyance control unit. The skew correction unit makes the leading edge of the succeeding sheet abut against the conveyance roller during a time from an end of a last line feed operation by the conveyance roller for printing on the preceding sheet by the printing unit to start of a next conveyance operation.

First claim

What is claimed is:

1. A printing apparatus comprising:
a feeding roller configured to feed a printing sheet;
a conveyance roller configured to intermittently convey the printing sheet fed by the feeding roller;
a printhead configured to discharge ink on the printing sheet conveyed by the conveyance roller;
a carriage configured to mount the printhead and move in a direction intersecting a sheet conveyance direction; and
a conveyance control unit
configured to form an overlap state where a trailing edge of a preceding sheet as a printing sheet precedingly fed and a leading edge of a succeeding sheet as a printing sheet succeedingly fed overlap each other between the feeding roller and the conveyance roller, and
configured to correct the skew of the succeeding sheet by making the leading edge of the succeeding sheet abut against the conveyance roller during stoppage of the conveyance roller for performing a printing operation of a last row of the preceding sheet in a case where the overlap state is formed.

2. The apparatus according to claim 1 , wherein when feeding the succeeding sheet from the stacking unit, the conveyance control unit starts to feed the succeeding sheet while having a predetermined interval with respect to the trailing edge of the preceding sheet.

3. The apparatus according to claim 2 , wherein the conveyance control unit is further configured to detected by the detection unit.

4. The apparatus according to claim 1 , further comprising:
a detection unit configured to detect a non-printing area from printing data, wherein the detection unit detects a non-printing area of the preceding sheet and a non-printing area of the succeeding sheet; and
a determination unit configured to determine whether to convey the succeeding sheet to a position facing the printing unit while keeping an overlap state by using the non-printing area of the preceding sheet and the non-printing area of the succeeding sheet which have been detected by the detection unit.

5. The apparatus according to claim 4 , wherein the detection unit detects a leading edge position of the succeeding sheet before the printing unit performs a printing operation of a last row of the preceding sheet.

6. The apparatus according to claim 1 , further comprising:
a determination unit configured to determine whether to keep an overlap state between the preceding sheet and the succeeding sheet while conveying the succeeding sheet to a position facing the printing unit,
wherein if the determination unit determines not to keep the overlap state, the conveyance control unit controls to convey the preceding sheet while feeding of the succeeding sheet stops, and to convey only the succeeding sheet to the position facing the printing unit.

7. The apparatus according to claim 6 , wherein if the determination unit determines not to form the overlap state before forming the overlap state, the conveyance control unit conveys the preceding sheet and the succeeding sheet to have a predetermined interval between the trailing edge of the preceding sheet and the leading edge of the succeeding sheet.

8. The apparatus according to claim 6 , wherein if the determination unit determines to keep the overlap state, the conveyance control unit decreases a rotation amount of the conveyance roller for performing a line feed operation of a last row of the preceding sheet, as compared with a case in which the determination unit determines not to keep the overlap state.

9. A control method of a printing apparatus having a feeding roller configured to feed a printing sheet, a conveyance roller configured to intermittently convey the printing sheet fed by the feeding roller, a printhead configured to discharge ink on the printing sheet conveyed by the conveyance roller and a carriage configured to mount the printhead and move in a direction intersecting a sheet conveyance direction, the method comprising:
forming an overlap state where a trailing edge of a preceding sheet as a printing sheet precedingly fed and a leading edge of a succeeding sheet as a printing sheet succeedingly fed overlap each other between the feeding roller and the conveyance roller; and
correcting the skew of the succeeding sheet by making the leading edge of the succeeding sheet abut against the conveyance roller during stoppage of the conveyance roller for performing a printing operation of a last row of the preceding sheet in a case where the overlap state is formed.

10. A non-transitory computer-readable storage medium storing a program for causing a computer to execute a control method of a printing apparatus having a feeding roller configured to feed a printing sheet, a conveyance roller configured to intermittently convey the printing sheet feed by the feeding roller, a printhead configured to discharge ink on the printing sheet conveyed by the conveyance roller and a carriage configured to mount the printhead and move in a direction intersecting a sheet conveyance direction, the method comprising:
forming an overlap state where a trailing edge of a preceding sheet as a printing sheet precedingly fed and a leading edge of a succeeding sheet as a printing sheet succeedingly fed overlap each other between the feeding roller and the conveyance roller; and
correcting the skew of the succeeding sheet by making the leading edge of the succeeding sheet abut against the conveyance roller during stoppage of the conveyance roller for performing a printing operation of a last row of the preceding sheet in a case where the overlap state is formed.

Assignees

• Canon Kk

Inventors

• Asai Yasuyuki
• Kunihiro Syunichi
• Aoyama Naoki
• Ogawa Katsuya
• Sugiyama Noriyuki
• Tanaami Yasufumi
• Yonemoto Ryo

Classifications

• B41J15/046

  for the guidance of continuous copy material, e.g. for preventing skewed conveyance of the continuous copy material · CPC title

• B41J13/0009

  control of the transport of the copy material · CPC title

• B65H5/24 Primary

  Feeding articles in overlapping streams, i.e. by separation of articles from a pile · CPC title

• B41J13/0018

  in the sheet input section of automatic paper handling systems · CPC title

• B41J11/0095

  Detecting means for copy material, e.g. for detecting or sensing presence of copy material or its leading or trailing end · CPC title