Printing apparatus and control method therefor

Patent metadata

Field	Value
Publication number	US-9443173-B2
Application number	US-201514722324-A
Country	US
Kind code	B2
Filing date	May 27, 2015
Priority date	Jun 4, 2014
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

A printing apparatus comprises 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 a 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 determination unit which determines 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. The determination unit determines whether the printing sheet is suitable for overlap conveyance, and if the determination unit determines that the printing sheet is unsuitable for overlap conveyance, the conveyance control unit conveys the succeeding sheet while the succeeding sheet does not overlap the preceding 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 contact member arranged between the feeding roller and the conveyance roller, wherein a state of the contact member is changeable by swinging when the contact member contacts the printing sheet;
a conveyance control unit configured to control conveyance of printing sheets so as 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
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 canceling the overlap state based on a state change of the contact member.

2. The apparatus according to claim 1 , wherein the determination unit divisionally determines once or a plurality of times whether the fed printing sheet is suitable for overlap conveyance.

3. The apparatus according to claim 1 , wherein the determination unit determines whether the fed printing sheet is suitable for overlap conveyance by using an nth (n is a natural number) printing sheet including a first printing sheet.

4. The apparatus according to claim 1 , further comprising:
a sensor configured to detect a state change of the contact member and output a value indicating the state change of the contact member,
wherein based on an output value of the sensor, the determination unit determines whether to convey the succeeding sheet to the position while keeping the overlap state, or to convey the succeeding sheet to the position after canceling the overlap state.

5. The apparatus according to claim 4 , wherein the determination unit determines to convey the succeeding sheet to the position after canceling the overlap state in a case where the output of the sensor is not changed when the contact member contacts a printing sheet fed by the feeding roller.

6. The apparatus according to claim 4 ,
wherein the convey control unit performs a skew correction operation to make a leading edge of a printing sheet abut against the conveyance roller and to correct the skew of the printing sheet before a printing operation,
wherein the determination unit determines to convey the succeeding sheet to the position after canceling the overlap state in a case where the output of the sensor is not changed when the skew correction operation is completed.

7. The apparatus according to claim 1 , further comprising:
a sensor configured to detect the state change of the contact member and output a value indicating the state change of the contact member,
wherein based on comparison of an output value of the sensor and a threshold, the determination unit determines whether to convey the succeeding sheet to the position while keeping the overlap state, or to convey the succeeding sheet to the position after canceling the overlap state.

8. The apparatus according to claim 1 , wherein if the determination unit determines not to maintain the overlap state, the conveyance control unit controls to convey the preceding sheet while feeding of the succeeding sheet stops, and convey only the succeeding sheet to a position facing the printing unit.

9. 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.

10. 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, a printing unit configured to print the printing sheet conveyed by the conveyance roller, a contact member arranged between the feeding roller and the conveyance roller, wherein a state of the contact member is changeable by swinging when the contact member contacts the printing sheet, the method comprising:
controlling conveyance of printing sheets so as 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
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 after canceling the overlap state based on a state change of the contact member.

11. A non-transitory computer-readable storage medium storing a program for causing a computer to execute a control method to control 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, a printing unit configured to print the printing sheet conveyed by the conveyance roller, and a contact member arranged between the feeding roller and the conveyance roller, wherein a state of the contact member is changeable by swinging when the contact member contacts the printing sheet, the control method comprising
controlling conveyance of printing sheets so as 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
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 after canceling the overlap state based on a state change of the contact member.

Assignees

• Canon Kk

Inventors

• Taguchi Motoyuki
• Kunihiro Syunichi
• Saito Tetsuya
• Suzuki Yoshiaki
• Sugiyama Noriyuki
• Asai Yasuyuki
• Yonemoto Ryo

Classifications

• B41J13/0018 Primary

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

• B65H29/66

  Advancing articles in overlapping streams · CPC title

• B65H2511/414

  of mode of operation · CPC title

• B65H5/062

  between rollers or balls · CPC title

• B65H2511/22

  Distance · CPC title