Printing apparatus, control method therefor, and storage medium

Patent metadata

Field	Value
Publication number	US-9370946-B2
Application number	US-201514722379-A
Country	US
Kind code	B2
Filing date	May 27, 2015
Priority date	Jun 4, 2014
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

A printing apparatus comprises a feeding roller configured to feed a printing sheet, a conveyance roller configured to convey the printing sheet, a printing unit configured to print on the printing sheet, a conveyance control unit configured to control conveyance of printing sheets so that a trailing edge of a preceding sheet and a leading edge of a succeeding sheet overlap each other, a determination unit configured to determine whether the leading edge of the succeeding sheet overlaps the trailing edge of the preceding sheet, and a delay unit configured to delay conveyance of the preceding sheet when the determination unit determines that the leading edge of the succeeding sheet does not overlap the trailing edge of the preceding sheet.

First claim

What is claimed is:

1. A printing apparatus comprising:
a feeding roller configured to feed a printing sheet stacked on a stacking unit;
a conveyance roller configured to convey the printing sheet fed by said feeding roller;
a printing unit configured to print on the printing sheet conveyed by said conveyance roller;
a conveyance control unit configured to control 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 succedingly fed from the stacking unit overlap each other;
a determination unit configured to determine whether the leading edge of the succeeding sheet overlaps the trailing edge of the preceding sheet; and
a delay unit configured to delay conveyance of the preceding sheet when said determination unit determines that the leading edge of the succeeding sheet does not overlap the trailing edge of the preceding sheet.

2. The apparatus according to claim 1 , wherein said delay unit delays conveyance of the preceding sheet by decreasing the rotation speed of said conveyance roller.

3. The apparatus according to claim 1 , wherein said delay unit delays conveyance of the preceding sheet by setting a delay time between a conveyance operation and a next conveyance operation.

4. The apparatus according to claim 1 , further comprising:
a carriage configured to move with said printing unit mounted thereon;
a calculation unit configured to calculate a required time based on a time taken to convey the preceding sheet, a time taken to move said carriage, a time taken to feed the succeeding sheet, and a time taken to perform a skew correction operation of the succeeding sheet; and
a judging unit configured to judge based on the required time calculated by said calculation unit whether to delay conveyance of the preceding sheet by said delay unit.

5. A control method for a printing apparatus including a feeding roller configured to feed a printing sheet stacked on a stacking unit, a conveyance roller configured to convey the printing sheet fed by the feeding roller, and a printing unit configured to print on the printing sheet conveyed by the conveyance roller, the method comprising:
a conveyance control step of controlling 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 succedingly fed from the stacking unit overlap each other;
a determination step of determining whether the leading edge of the succeeding sheet overlaps the trailing edge of the preceding sheet; and
a delay step of delaying conveyance of the preceding sheet,
wherein when it is determined in the determination step that the leading edge of the succeeding sheet does not overlap the trailing edge of the preceding sheet, conveyance of the preceding sheet is delayed in the delay step.

6. The method according to claim 5 , wherein
conveyance of the preceding sheet is delayed in the delay step by decreasing the rotation speed of the conveyance roller.

7. The method according to claim 5 , wherein
conveyance of the preceding sheet is delayed in the delay step by setting a delay time between a conveyance operation and a next conveyance operation.

8. The method according to claim 5 , wherein
the printing apparatus further includes a carriage configured to move with the printing unit mounted thereon, and
the control method for the printing apparatus further includes a calculation step of calculating a required time based on a time taken to convey the preceding sheet, a time taken to move the carriage, a time taken to feed the succeeding sheet, and a time taken to perform a skew correction operation of the succeeding sheet, and a judging step of judging based on the required time calculated in the calculation step whether to delay conveyance of the preceding sheet in the delay step.

9. A computer-readable storage medium storing a program for causing a computer to execute each step of a control method defined in claim 5 .

Assignees

• Canon Kk

Inventors

• Nishida Tomofumi
• Suzuki Yoshiaki
• Sugiyama Noriyuki
• Asai Yasuyuki
• Ito Masashi
• Aoyama Naoki
• Kunihiro Syunichi

Classifications

• B65H2511/415

  of job · CPC title

• B65H2404/6111

  and shaped for curvilinear transport path · CPC title

• B65H2220/02

  indicating an entity which is controlled, adjusted or changed by a control process, i.e. output · CPC title

• B65H2801/12

  Single-function printing machines, typically table-top machines · CPC title

• B65H7/02

  by feelers or detectors · CPC title