Printing apparatus and control method thereof for adjusting the distance between a printhead and a print medium

Patent metadata

Field	Value
Publication number	US-11945235-B2
Application number	US-202218061664-A
Country	US
Kind code	B2
Filing date	Dec 5, 2022
Priority date	Jun 19, 2020
Publication date	Apr 2, 2024
Grant date	Apr 2, 2024

Abstract

There is provided a printing apparatus which includes the following: A printhead including a plurality of nozzles that discharge ink to a print medium. A first detection unit that detects a distance between the printhead and a platen. An adjustment unit that adjusts the distance between the printhead and the platen. An acquisition unit that acquires difference information concerning a difference of a distance between the platen and each of the nozzle on an upstream side and the nozzle on a downstream side in a conveyance direction of the print medium. The adjustment unit adjusts the distance based on a detection result of the first detection unit and the difference information acquired by the acquisition unit.

First claim

What is claimed is:

1. A printing apparatus comprising:
a printhead including a plurality of nozzles configured to discharge ink to a print medium;
a platen configured to support the print medium and including a platen patch which is provided at a position facing the printhead;
a first detection unit configured to detect a distance between the printhead and the platen by detecting the platen patch;
an acquisition unit configured to acquire information concerning a difference between a first distance between the platen and an upstream nozzle area on an upstream side of the printhead in a conveyance direction of the print medium and a second distance between the platen and a downstream nozzle area on a downstream side of the printhead in the conveyance direction,
a control unit configured to cause the printing apparatus to perform a predetermined operation based on a detection result of the first detection unit and the information acquired by the acquisition unit.

2. The apparatus according to claim 1 , wherein the information is information based on a print result by the printhead.

3. The apparatus according to claim 1 , further comprising an acceptance unit configured to accept input by a user,
wherein the information is input information input by a user to the acceptance unit based on a print result by the printhead.

4. The apparatus according to claim 1 , further comprising a second detection unit configured to detect a print result by the printhead,
wherein the information is information based on a detection result of the second detection unit.

5. The apparatus according to claim 1 , wherein the information is information based on a first pattern image printed on the print medium by the printhead moving at a first speed and a second pattern image printed on the print medium by the printhead moving at a second speed.

6. The apparatus according to claim 1 , wherein the control unit cause the printing apparatus to perform the predetermined operation in a preliminary step before a printing operation in which ink is discharged from the nozzles to the print medium to print an image on the print medium is performed.

7. The apparatus according to claim 1 , wherein the platen includes a plurality of platen patches which are provided at positions facing the printhead.

8. The apparatus according to claim 1 , further comprising an adjustment unit configured to adjust the distance between the printhead and the platen; and
a setting unit configured to set, based on a detection result of the first detection unit and the information acquired by the acquisition unit, data that is associated with distance information about a distance between the printhead and the platen and a control parameter of the adjustment unit,
wherein the predetermined operation is an adjustment operation performed by the adjustment unit based on the detection result and the information, and
the adjustment unit executes adjustment of the distance between the printhead and the platen based on the data set by the setting unit.

9. The apparatus according to claim 8 , wherein the distance information is an average value of the distance between the platen and at least one nozzle in the upstream nozzle area on the upstream side and the distance between the platen and at least one nozzle in the downstream nozzle area on the downstream side.

10. The apparatus according to claim 8 , wherein the information is information based on a first pattern image printed on the print medium by the printhead moving at a first speed and a second pattern image printed on the print medium by the printhead moving at a second speed, the first speed and the second speed being different from each other,
the printhead respectively prints the first pattern image and the second pattern image in a plurality of ranges different from each other in a widthwise direction crossing the conveyance direction of the print medium, and
the setting unit sets the data based on the difference information in each of the plurality of ranges.

11. The apparatus according to claim 10 , wherein the distance information is an average value of a maximum value and a minimum value of the distance between the platen and at least one nozzle in the upstream nozzle area on the upstream side and at least one nozzle in the downstream nozzle area on the downstream side in each of the plurality of ranges.

12. The apparatus according to claim 8 , wherein the setting unit sets the data based on the detection result and the information according to a size of the print medium in a widthwise direction crossing the conveyance direction.

13. The apparatus according to claim 8 , wherein the setting unit executes the setting of the data in accordance with power-on of the printing apparatus.

14. The apparatus according to claim 8 , further comprising a storage unit configured to store the data,
wherein the setting unit updates the data stored in advance in the storage unit, based on the detection result and the information.

15. The apparatus according to claim 8 , further comprising a carriage including the printhead and capable of reciprocally moving in a widthwise direction of the print medium crossing the conveyance direction,
wherein the adjustment unit includes a motor capable of adjusting the distance between the printhead and the platen, and
the control parameter is a parameter concerning a rotation angle of the motor.

16. The apparatus according to claim 3 , wherein the acceptance unit includes a display unit configured to display information used to accept input by a user.

17. A control method of a printing apparatus having a printhead including a plurality of nozzles configured to discharge ink to a print medium, the method comprising:
detecting a distance between the printhead and a platen by detecting a platen patch provided in the platen at a position facing the printhead;
acquiring information concerning a difference between a first distance between the platen and an upstream nozzle area on an upstream side of the printhead in a conveyance direction of the print medium and a second distance between the platen and a downstream nozzle area on a downstream side of the printhead in the conveyance direction; and
controlling the printing apparatus so as to perform a predetermined operation based on a detection result of the detecting and the information acquired in the acquiring.

18. The method according to claim 17 , wherein the information is information based on a print result by the printhead.

19. The method according to claim 17 , further comprising accepting input by a user,
wherein the information is input information input by a user in the accepting based on a print result by the printhead.

20. The method according to claim 17 , further comprising detecting a print result by the printhead,
wherein the information is information based on a detection result in the detecting the print result.

21. The method according to claim 17 , wherein the information is information based on a first pattern image printed on the print medium by the printhead moving at a first speed and a second pattern image printed on the print medium by the printhead moving at a second speed.

22. The method according to claim 17 , further comprising
adjusting the distance between the printhead and the platen, and
setting, based on a detection result in the detecting and the information acquired in the acquiring, data with which distance information between the printhead and the plat

Assignees

• Canon Kk

Inventors

• Abe Tomohito
• Kuronuma Daigo
• Takahashi Ryutaro
• Wada Naoaki
• Aoki Noriyuki
• Maruyama Ryohei
• Nagashima Masakazu
• Yamaguchi Toshiaki

Classifications

• B41J25/3082 Primary

  with print gap adjustment means on the print head carriage, e.g. for rotation around a guide bar or using a rotatable eccentric bearing · CPC title

• B41J11/008

  Controlling printhead for accurately positioning print image on printing material, e.g. with the intention to control the width of margins · CPC title

• B41J25/3086 Primary

  with print gap adjustment means between the print head and its carriage · CPC title

• B41J25/3088

  with print gap adjustment means on the printer frame, e.g. for rotation of an eccentric carriage guide shaft · CPC title