Image printing apparatus and control method

Patent metadata

Field	Value
Publication number	US-12023913-B2
Application number	US-202117488987-A
Country	US
Kind code	B2
Filing date	Sep 29, 2021
Priority date	Sep 30, 2020
Publication date	Jul 2, 2024
Grant date	Jul 2, 2024

Abstract

An image printing apparatus and a method of controlling the same are capable of appropriately correcting the conveyance amount in each of a plurality of conveyance paths. In a case of conveying a print medium along a first conveyance path, a controller controls the driving of a conveyance motor based on first information. In a case of conveying the print medium along a second conveyance path, the controller controls the driving of the conveyance motor based on second information, which is different from the first information.

First claim

What is claimed is:

1. An image printing apparatus comprising:
a conveyance roller that conveys a print medium in a conveyance direction;
a printing unit that prints an image onto the print medium conveyed by the conveyance roller;
a first conveyance path that guides, in a predetermined direction, the print medium on which the image is printed by the printing unit;
a second conveyance path that guides, in a direction different from the predetermined direction, the print medium on which the image is printed by the printing unit; and
a control unit configured to adjust a conveyance amount of the conveyance roller,
wherein, in a case of conveying the print medium along the first conveyance path, the conveyance roller conveys the print medium based on a first conveyance amount and in a case of conveying the print medium along the second conveyance path, the conveyance roller conveys the print medium based on a second conveyance amount which is different from the first conveyance amount, and
wherein the control unit executes a first mode in which the second conveyance amount is derived based on the first conveyance amount obtained by conveying the print medium along the first conveyance path and a second mode in which the first conveyance amount is derived based on the second conveyance amount obtained by conveying the print medium along the second conveyance path.

2. The image printing apparatus according to claim 1 , wherein the first conveyance path and the second conveyance path are provided downstream of the printing unit in the conveyance direction.

3. The image printing apparatus according to claim 1 , wherein
in the first mode, while conveying the print medium along the first conveyance path, the printing unit is caused to print a predetermined adjustment pattern onto the print medium and the first conveyance amount is obtained based on an optical density of the predetermined adjustment pattern, and
in the second mode, while conveying the print medium along the second conveyance path, the printing unit is caused to print the predetermined adjustment pattern onto the print medium and the second conveyance amount is obtained based on the optical density of the predetermined adjustment pattern.

4. The image printing apparatus according to claim 3 , wherein
in the case of executing the first mode, the control unit maintains the second conveyance amount stored in a storage unit individually storing the first conveyance amount and the second conveyance amount in a case where the second conveyance amount stored in the storage unit is not an initial value, and
in the case of executing the second mode, the control unit maintains the first conveyance amount stored in the storage unit in a case where the first conveyance amount stored in the storage unit is not an initial value.

5. The image printing apparatus according to claim 4 , further comprising the storage unit.

6. The image printing apparatus according to claim 3 , wherein
in the case of executing the first mode, the control unit maintains the second conveyance amount stored in a storage unit individually storing the first conveyance amount and the second conveyance amount in a case where an elapsed time since last execution of the second mode has not exceeded a predetermined threshold value, and
in the case of executing the second mode, the control unit maintains the first conveyance amount stored in the storage unit in a case where an elapsed time since last execution of the first mode has not exceeded a predetermined threshold value.

7. The image printing apparatus according to claim 3 , further comprising a detection unit that detects the optical density of the adjustment pattern.

8. The image printing apparatus according to claim 3 , further comprising a reception unit that receives information on the optical density of the adjustment pattern.

9. An image printing apparatus comprising:
a conveyance roller that conveys a print medium in a conveyance direction;
a printing unit that prints an image onto the print medium conveyed by the conveyance roller;
a first conveyance path that guides, in a predetermined direction, the print medium on which the image is printed by the printing unit; and
a second conveyance path that includes a plurality of sections and guides, in a direction different from the predetermined direction, the print medium on which the image is printed by the printing unit, and
a control unit configured to adjust a conveyance amount of the conveyance roller,
wherein, in a case of conveying the print medium along the first conveyance path, the conveyance roller conveys the print medium based on a first conveyance amount and in a case of conveying the print medium along the second conveyance path, the conveyance roller conveys the print medium based on a second conveyance amount which is different from the first conveyance amount,
wherein the second conveyance amount is derived based on the first conveyance amount obtained by conveying the print medium along the first conveyance path,
wherein the second conveyance amount is individually set for each of the plurality of sections, and
wherein in the case of conveying the print medium along the second conveyance path, the control unit changes the driving amount of the conveyance roller based on the second conveyance amount according to the section among the plurality of sections in which a leading edge of the print medium is located.

10. The image printing apparatus according to claim 9 , wherein
in the second conveyance path, a first roller pair and a second roller pair each of which nips and conveys the print medium are disposed away from each other in the conveyance direction, and
the second conveyance path includes a first section from the first roller pair to the second roller pair, and a second section downstream of the second roller pair in the conveyance direction.

11. The image printing apparatus according to claim 9 , wherein
in the second conveyance path, a first roller pair and a second roller pair each of which nips and conveys the print medium are disposed away from each other in the conveyance direction, and
the second conveyance path includes a third section including the second roller pair, a first section from the first roller pair to a near side of the third section, and a second section downstream of the third section in the conveyance direction.

12. The image printing apparatus according to claim 11 , wherein the second conveyance amount on the third section is set at a value equal to the second conveyance amount on the second section.

13. The image printing apparatus according to claim 11 , wherein the second conveyance amount on the third section is derived based on the second conveyance amount on the first section and the second conveyance amount on the second section.

14. The image printing apparatus according to claim 1 , wherein
the conveyance roller is driven by a first driving source and a second driving source,
in the case of conveying the print medium along the first conveyance path, the conveyance roller conveys the print medium by using the first driving source and not using the second driving source, and
in the case of conveying the print medium along the second conveyance path, the conveyance roller conveys the print medium by using the first driving source and the second driving source.

15. The image printing apparatus according to claim 1 , wherein the image is printed onto the print medium by alternately repeating a printing scan in which the printing unit prints an image while being moved in a direction crossing the conveyance dir

Assignees

• Canon Kk

Inventors

• Yoshikawa Serena
• Baba Naoko
• Konno Yuji
• Marumoto Yoshitomo
• Genta Shin
• Ushiyama Takayuki
• Shimokodachi Yumi
• Yokokawa Taichi

Classifications

• B41J13/00

  Devices or arrangements {of selective printing mechanisms, e.g. ink-jet printers or thermal printers,} specially adapted for supporting or handling copy material in short lengths, e.g. sheets · CPC title

• B41J15/18

  Multiple web-feeding apparatus · CPC title

• B41J15/22

  for feeding webs in separate paths during printing · CPC title

• B41J11/42 Primary

  Controlling {printing material conveyance for accurate alignment of the printing material with the printhead; Print registering} · CPC title