Printing apparatus and image processing apparatus

Patent metadata

Field	Value
Publication number	US-11766882-B2
Application number	US-202117479015-A
Country	US
Kind code	B2
Filing date	Sep 20, 2021
Priority date	Sep 24, 2020
Publication date	Sep 26, 2023
Grant date	Sep 26, 2023

Abstract

A printing apparatus includes an image processing unit and generates a product by performing printing on a print medium conveyed in a conveyance direction intersecting a width direction, based on data for printing, and then cutting a width-direction end portion of a printed image, wherein the image processing unit calculates a first ink application amount of a first area formed at one end portion in the width direction on a leading edge side of the image which is located on a downstream side in the conveyance direction during printing and a second ink application amount of a second area formed at the other end in the width direction on the leading edge and enlarges the image data at a predetermined ratio to obtain the data for printing in a case where at least one of the first ink application amount and the second ink application amount exceeds a threshold value.

First claim

What is claimed is:

1. A printing apparatus comprising:
a conveyance unit configured to convey a print medium in a conveyance direction;
a printing unit configured to print an image by applying ink to the print medium which is conveyed by the conveyance unit;
a slitter unit disposed on a downstream side in the conveyance direction relative to the printing unit and configured to cut the print medium along the conveyance direction at a position according to a size of a product in a width direction of the print medium, the width direction intersecting the conveyance direction;
an image processing unit configured to perform image processing on image data to obtain data for printing; and
a control unit configured to control the slitter unit to cut a width-direction end portion of the printed image after the image is printed based on the data for printing, so as to thereby generate the product,
wherein the image processing unit
calculates a first ink application amount of a first area and a second ink application amount of a second area, based on the image data, the first area being formed at one end portion in the width direction on a leading edge side of the image which is located on the downstream side in the conveyance direction during printing, the second area being formed at the other end in the width direction on the leading edge, and
enlarges the image data at a predetermined ratio to obtain the data for printing in a case where at least one of the first ink application amount and the second ink application amount exceeds a threshold value.

2. The printing apparatus according to claim 1 ,
wherein, for obtaining the data for printing, the image processing unit enlarges the image data at a second enlargement rate that is smaller than a first enlargement rate, which is the predetermined ratio, in a case where both of the first ink application amount and the second ink application amount are equal to or less than the threshold value.

3. The printing apparatus according to claim 1 ,
wherein a resolution of the image data used by the image processing unit to calculate the ink application amounts is lower than a resolution of the image data used to obtain the data for printing.

4. The printing apparatus according to claim 1 ,
wherein the threshold value is a lower limit value of ink application amount with which floating occurs to the print medium or a value that is less than the lower limit value by a predetermined amount.

5. The printing apparatus according to claim 1 ,
wherein the first area is a rectangular area having a predetermined length in the conveyance direction and a predetermined length in the width direction from a first corner on one side of the width direction on the leading edge side of the image which is located on the downstream side in the conveyance direction during printing, and
wherein the second area is a rectangular area having the predetermined length in the conveyance direction and the predetermined length in the width direction from a second corner on the other side of the width direction on the leading edge side.

6. The printing apparatus according to claim 1 ,
wherein an ink application amount calculated by the image processing unit is a printing duty which indicates an ink application amount for a unit area.

7. The printing apparatus according to claim 1 ,
wherein the generated product is a product in which a margin adjacent to the width-direction end portion of the printed image is not formed.

8. The printing apparatus according to claim 7 ,
wherein the threshold value is a lower limit value of ink application amount which causes the print medium to float, which forms a margin adjacent to the width-direction end portion of the image that is cut by the slitter unit, or a value that is less than the lower limit value by a predetermined amount.

9. The printing apparatus according to claim 1 ,
wherein the image processing unit performs image processing on not-enlarged image data to obtain the data for printing, and
wherein, after printing is performed based on the obtained data for printing, the slitter unit cuts a position which is separated from the width-direction end portion of the printed image, so that a product in which a margin adjacent to the width-direction end portion of the image is formed can be further obtained.

10. A printing apparatus comprising:
a conveyance unit configured to convey a print medium in a conveyance direction;
a printing unit configured to print an image by applying ink to the print medium which is conveyed by the conveyance unit;
a slitter unit disposed on a downstream side in the conveyance direction relative to the printing unit and configured to cut the print medium along the conveyance direction at a position according to a size of a product in a width direction of the print medium, the width direction intersecting the conveyance direction;
an image processing unit configured to perform image processing on image data to obtain data for printing; and
a control unit configured to control the slitter unit to cut a width-direction end portion of the printed image after the image is printed based on the data for printing, so as to thereby generate the product,
wherein the image processing unit
calculates a first ink application amount of a first area, a second ink application amount of a second area, a third ink application amount of a third area, and a fourth ink application amount of a fourth area, based on the image data, the first area being formed at one end portion in the width direction on a leading edge side of the image which is located on the downstream side in the conveyance direction during printing, the second area being formed at the other end portion in the width direction on the leading edge side, the third area being formed at one end portion in the width direction on a rear edge side of the image which is located on an upstream side in the conveyance direction during printing, the fourth area being formed at the other end portion in the width direction on the rear edge side,
rotates the image data by 180° to obtain the data for printing in a case where at least one of the first ink application amount and the second ink application amount exceeds a threshold value and both of the third ink application amount and the fourth ink application amount are equal to or less than the threshold value, and
enlarges the image data at a predetermined ratio without rotating the image data to obtain the data for printing in a case where at least one of the first ink application amount and the second ink application amount exceeds the threshold value and at least one of the third ink application amount and the fourth ink application amount exceeds the threshold value.

11. The printing apparatus according to claim 10 ,
wherein, for obtaining the data for printing, the image processing unit enlarges the image data at a second enlargement rate that is smaller than a first enlargement rate, which is the predetermined ratio, in a case where both of the first ink application amount and the second ink application amount are equal to or less than the threshold value and in a case where at least one of the first ink application amount and the second ink application amount exceeds the threshold value and both of the third ink application amount and the fourth ink application amount are equal to or less than the threshold value.

12. The printing apparatus according to claim 10 ,
wherein the first area is a rectangular area having a predetermined length in the conveyance direction and a predetermined length in the width direction from a first corner on one side of the width direction on the leadin

Assignees

• Canon Kk

Inventors

• Konno Yuji
• Wada Satoshi
• Baba Naoko
• Nagai Hajime
• Nishioka Shingo
• Yoshizawa Kei
• Saito Junichi
• Yoshikawa Serena

Classifications

• B41J11/68 Primary

  cutting parallel to the direction of paper feed · CPC title

• B41J2/01

  Ink jet · CPC title

• B41J11/42

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

• B41J11/663

  Controlling cutting, cutting resulting in special shapes of the cutting line, e.g. controlling cutting positions, e.g. for cutting in the immediate vicinity of a printed image · CPC title

• B41J11/0065

  Means for printing without leaving a margin on at least one edge of the copy material, e.g. edge-to-edge printing · CPC title