Printing apparatus, control method therefor and storage medium

Patent metadata

Field	Value
Publication number	US-9586780-B2
Application number	US-201514623860-A
Country	US
Kind code	B2
Filing date	Feb 17, 2015
Priority date	Mar 10, 2014
Publication date	Mar 7, 2017
Grant date	Mar 7, 2017

Abstract

A printing apparatus includes 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, a printing unit configured to print the printing sheet conveyed by the conveyance roller, a conveyance control unit configured to control conveyance of printing sheets so that the trailing edge of a preceding sheet as a printing sheet precedingly fed from the stacking unit and the leading edge of a succeeding sheet as a printing sheet succeedingly fed from the stacking unit overlap each other, 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 between the preceding sheet and the succeeding sheet.

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 convey the printing sheet fed by the feeding roller;
a printing unit configured to print the printing sheet conveyed by the conveyance roller;
a conveyance control unit configured to control conveyance of printing sheets so that an overlap state, in which a trailing edge of a preceding sheet as a printing sheet precedingly fed by the feeding roller and a leading edge of a succeeding sheet as a printing sheet succeedingly fed by the feeding roller overlap each other, is formed between the feeding roller and the conveyance roller; and
a determination unit configured to determine whether to convey the succeeding sheet to a position facing the printing unit while keeping the overlap state or to convey the succeeding sheet to the position after cancelling the overlap state.

2. The apparatus according to claim 1 , wherein when feeding the succeeding sheet by the feeding roller , 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 makes the succeeding sheet catch up with the preceding sheet by rotating the feeding roller, which feeds the succeeding sheet, at a rotation speed higher than that of the conveyance roller while the preceding sheet is conveyed by the conveyance roller.

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 the determination unit determines whether to convey the succeeding sheet to the position facing the printing unit while keeping the overlap state by using the detected non-printing area of the preceding sheet and the detected non-printing area of the succeeding sheet.

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 , wherein if the determination unit determines to convey the succeeding sheet to the position after cancelling the overlap state, the conveyance control unit controls to convey the preceding sheet until the preceding sheet is output while feeding of the succeeding sheet stops, and then to convey the succeeding sheet to the position.

7. The apparatus according to claim 1 , 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 1 ,
wherein in a case that an overlap amount of the trailing edge the preceding sheet and the leading edge of the succeeding sheet is smaller than a threshold value, the determination unit determines to convey the succeeding sheet to the position after cancelling the overlap state.

9. The apparatus according to claim 1 ,
wherein in a case that the leading edge of the succeeding sheet is not conveyed to a predetermined position when the succeeding sheet is conveyed to a printing start position at which a printing operation by the printing unit is started, the determination unit determines to convey the succeeding sheet to the position after cancelling the overlap state.

10. The apparatus according to claim 1 ,
wherein in a case that there is no gap between a last row of the preceding sheet and a row immediately preceding the last row, the determination unit determines to convey the succeeding sheet to the position after cancelling the overlap state.

11. A method of controlling a printing apparatus including a feeding roller configured to feed a printing sheet , a conveyance roller configured to convey the printing sheet fed by the feeding roller, and a printing unit configured to print the printing sheet conveyed by the conveyance roller, the method comprising:
controlling conveyance of printing sheets so that an overlap state, in which a trailing edge of a preceding sheet as a printing sheet precedingly fed by the feeding roller and a leading edge of a succeeding sheet as a printing sheet succeedingly fed by the feeding roller overlap each other, is formed between the feeding roller and the conveyance roller; and
determining whether to convey the succeeding sheet to a position facing the printing unit while keeping the overlap state or to convey the succeeding sheet to the position facing the printing unit after the overlap state has been cancelled.

12. A non-transitory computer-readable storage medium storing a program for causing a computer to execute each step of a method of controlling a printing apparatus including a feeding roller configured to feed a printing sheet, a conveyance roller configured to convey the printing sheet fed by the feeding roller, and a printing unit configured to print the printing sheet conveyed by the conveyance roller,
the method comprising:
controlling conveyance of printing sheets so that an overlap state, in which a trailing edge of a preceding sheet as a printing sheet precedingly fed by the feeding roller and a leading edge of a succeeding sheet as a printing sheet succeedingly fed by the feeding roller overlap each other, is formed between the feeding roller and the conveyance roller; and
determining whether to convey the succeeding sheet to a position facing the printing unit while keeping the overlap state or to convey the succeeding sheet to the position facing the printing unit after the overlap state has been cancelled.

Assignees

• Canon Kk

Inventors

• Nishida Tomofumi
• Sugiyama Noriyuki
• Asai Yasuyuki
• Taguchi Motoyuki
• Saito Tetsuya
• Suzuki Yoshiaki
• Kunihiro Syunichi

Classifications

• B65H2701/1313

  trailing edge · CPC title

• B41J11/0095 Primary

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

• B65H7/125 Primary

  sensing the double feed or separation without contacting the articles · CPC title

• B65H2404/6111

  and shaped for curvilinear transport path · CPC title

• B65H5/24

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