Printing apparatus and printing method

Patent metadata

Field	Value
Publication number	US-9434196-B2
Application number	US-201313905270-A
Country	US
Kind code	B2
Filing date	May 30, 2013
Priority date	Jun 8, 2012
Publication date	Sep 6, 2016
Grant date	Sep 6, 2016

Abstract

Printed products can be efficiently sorted into non-defective ones and defective ones even when a discharge failure occurs during the printing operation. Two inspection patterns for detecting discharge failure are printed before and after a plurality of images. The inspection patterns are read to determine the type of discharge failure. Printed media are sorted based on whether it is determined that there is a continuous discharge failure, whether it is determined that there is an accidental discharge failure, or whether it is determined that the discharge is normal.

First claim

What is claimed is:

1. A printing apparatus comprising:
a printhead having nozzles for printing a plurality of images and inspection patterns on a continuous print medium;
a reading unit configured to read and inspect the inspection patterns;
a cut unit configured to cut the continuous print medium on which the plurality of images are printed to form a print product;
a discharge unit configured to discharge the print product; and
a control unit configured to, based on inspection results of two successive inspection patterns inspected by said reading unit, control said discharge unit to discharge the print product which is printed between the two successive inspection patterns discriminately from another print product.

2. The apparatus according to claim 1 , wherein said control unit controls said discharge unit such that a first print product formed in a first case where no printing failure has occurred in both of the two successive inspection patterns, a second print product formed in a second case where printing failure has occurred in both of the two successive inspection patterns, and a third print product formed in a third case where printing failure has occurred in one of the two successive inspection patterns and no printing failure has occurred in the other of the two successive inspection patterns are discharged discriminately from each other.

3. The apparatus according to claim 2 , further comprising:
a first tray to which the first print product formed in the first case is discharged;
a second tray to which the second print product formed in the second case is discharged; and
a third tray to which the third print product formed in the third case is discharged.

4. The apparatus according to claim 2 , further comprising a tray,
wherein said control unit causes said discharge unit to discharge the first, second and third print products to discriminated positions on said tray in the first case, the second case, and the third case, respectively.

5. The apparatus according to claim 1 , wherein said control unit is further configured to:
detect a discharge state of ink of the nozzles based on inspection results of said reading unit, and
determine that a case where a number of nozzles where discharge failure has occurred is less than or equal to a threshold is no printing failure, and a case where a number of nozzles where discharge failure has occurred is more than the threshold is printing failure.

6. The apparatus according to claim 1 , wherein said control unit is further configured to perform complementary printing based on inspection results of said reading unit.

7. A method for printing with a printhead for discharging ink, comprising:
printing a plurality of images and inspection patterns on a continuous print medium;
reading and inspecting the inspection patterns;
forming a print product by cutting the continuous print medium on which the plurality of images are printed; and
discharging, based on inspection results of two successive inspection patterns, the print product which is printed between the two successive inspection patterns discriminately from another print product.

8. The method according to claim 7 , wherein in a case where the print product formed between the two successive inspection patterns is discharged based on the inspection results of the two successive inspection patterns, a first print product formed in a first case where no printing failure has occurred in both of the two successive inspection patterns, a second print product formed in a second case where printing failure has occurred in both of the two successive inspection patterns, and a third print product formed in a third case where printing failure has occurred in one of the two successive inspection patterns and no printing failure has occurred in the other of the two successive inspection patterns, are discharged discriminately from each other.

9. A printing apparatus comprising:
a printhead having nozzles for printing a plurality of images and inspection patterns on a continuous print medium;
a reading unit configured to read and inspect the inspection patterns;
a cut unit configured to cut the continuous print medium on which the plurality of images are printed to form a print product; and
a discharge unit configured to discharge the print product,
wherein the discharge unit discharges the print product formed between two successive inspection patterns in a case where a result of inspecting the two successive inspection patterns is a first result discriminately from the print product formed between two successive inspection patterns in a case where the result of inspecting the two successive inspection patterns is a second result different from the first result.

10. The apparatus according to claim 9 , further comprising a determination unit configured to determine that the result of inspecting the two successive inspection patterns is the first result in a case where no printing failure has occurred in both of the two successive inspection patterns, and determine that the result of inspecting the two successive inspection patterns is the second result in a case where printing failure has occurred in both of the two successive inspection patterns.

11. The apparatus according to claim 10 , further comprising:
a first tray to which the print product is discharged in a case where the result of inspecting the two successive inspection patterns is the first result; and
a second tray to which the print product is discharged in a case where the result of inspecting the two successive inspection patterns is the second result.

12. The apparatus according to claim 10 , wherein said determination unit determines that the result of inspecting the two successive inspection patterns is a third result in a case where no printing failure has occurred in one of the two successive inspection patterns and printing failure has occurred in the other of the two successive inspection patterns, and
said discharge unit discharges the print product in a case where the result of inspecting the two successive inspection patterns is the third result discriminately from the print product in a case where the result of the two successive inspection patterns is the second result.

13. The apparatus according to claim 12 , further comprising a third tray to which the print product is discharged in a case where the result of inspecting the two successive inspection patterns is the third result.

14. The apparatus according to claim 10 , further comprising a tray to which the print product in a case where the result of inspecting the two successive inspection patterns is the first result and the print product in a case where the result of inspecting the two successive inspection patterns is the second result are shifted from each other and discharged.

15. The apparatus according to claim 9 , further comprising an inspection unit configured to detect discharge failure of the nozzles based on inspection results of said reading unit.

16. The apparatus according to claim 15 , wherein said inspection unit determines that printing failure has occurred in a case where a number of the nozzles having the discharge failure exceeds a threshold.

17. The apparatus according to claim 16 , wherein a complementary printing operation is performed in a case where said inspection unit determines that the printing failure has occurred.

18. The apparatus according to claim 16 , further comprising a wiping unit configured to wipe a nozzle surface of the printhead,
wherein said wiping unit wipes t

Assignees

• Canon Kk

Inventors

• Fukasawa Takuya
• Murayama Yoshiaki
• Azuma Satoshi
• Teshigawara Minoru

Classifications

• B41J29/393 Primary

  Devices for controlling or analysing the entire machine {; Controlling or analysing mechanical parameters involving printing of test patterns} · CPC title

• B41J2/2146

  for line print heads · CPC title

• B41J2029/3935

  by means of printed test patterns · CPC title

• B41J2/2142 Primary

  Detection of malfunctioning nozzles (generating single droplets or particles on demand by pressure, e.g. electromechanical transducers B41J2/045, B41J2/05; jet deflection sensors B41J2/125; for cleaning purposes B41J2/16579) · CPC title