IMAGE FORMING APPARATUS AND IMAGE FORMING METHOD

• US 20190332048A1
• Filed: 04/17/2019
• Published: 10/31/2019
• Est. Priority Date: 04/25/2018
• Status: Active Grant

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Yamanaka, Shinichi
• Granted Patent: US 10,725,415 B2
• Time in Patent Office: Days
• CPC Class Codes: G03G 15/5029 by measuring the copy material characteristics, e.g. weight, thickness
• CPC Class Codes: G03G 15/5062 by measuring the characteristics of an image on the copy material
• CPC Class Codes: G03G 15/6579 Refeeding path for composite copying

Abstract

The printer includes an image forming unit which forms an image on a sheet and a media sensor which detects a characteristic of the sheet. If the characteristics of the sheet do not support automatic double-sided printing, the printer forms an image on the first side of the sheet and discharges the sheet to an FD sheet discharge portion or an FU sheet discharge portion. After discharging the sheet, the printer instructs a user to place the discharged sheet on a cassette or a manual feed tray. If the sheet having the image formed on the first side is placed on the cassette or the manual feed tray, the printer forms an image on a second side of the sheet. In this manner, the printer can perform the double-sided printing even if the sheet does not support the automatic double-sided printing.

Claims

1. An image forming apparatus configured to perform, based on a print job to be input, double-sided printing in which front and back of a recording material is reversed on a conveying path after a first side of the recording material is printed and thereafter a second side of the recording material is printed, or single-sided printing in which a first side of a recording material is printed and the recording material is discharged, the image forming apparatus comprising:

a feeder configured to feed the recording material;

an image forming unit configured to form an image on the recording material according to image data;

a discharge tray to which the recording material with the image formed is discharged;

a detector configured to detect a characteristic of the recording material fed by the feeder; and

a controller configured to determine whether the recording material supports the double-sided printing or not based on a detection result of the detector for the recording material fed by the feeder;

wherein the controller is further configured to control the image forming unit to form an image of an even-numbered page of the print job on the first side of the recording material in an order of page number, to discharge a recording material with an image formed on a first side to a discharge tray, to prompt a user to place the discharged recording material on a feeder for second side printing, and to control the image forming unit to form an image of an odd-numbered page on the second side of the recording material with the image formed on the first side which is fed from the feeder for the second side printing if it is determined that double-sided printing is specified by the print job and the recording material does not support the double-sided printing based on a detection result of the detector.

2. The image forming apparatus according to claim 1,

wherein the discharge tray includes a first discharge tray to which a side with an image of an odd-numbered page of the recording material formed is discharged downward, and a second discharge tray to which a side with an image of an odd-numbered page of the recording material formed is discharged upward, and

wherein the controller is further configured to determine a printing order of an odd-numbered page and an even-numbered page according to a discharge tray specified by the print job if it is determined that the recording material does not support the double-sided printing based on the detection result of the detector.

3. The image forming apparatus according to claim 1,

wherein the controller is further configured to perform notification to the user notifying that the recording material does not support the double-sided printing and prompting to place the recording material with an image formed on the first side and discharged to the discharge tray on a feeder for the second side printing if it is determined that the recording material does not support the double-sided printing.

4. The image forming apparatus according to claim 3,

wherein the notification prompting to place the recording material on the feeder includes a first notification which is notified when the number of printed page of the print job is predetermined value or less, and a second notification which is notified when the number of printed page of the print job exceeds the predetermined value.

5. The image forming apparatus according to claim 1,

wherein the feeder comprises a first feeder on which the recording material that an image of an even-numbered page is formed is placed with facing downward and a second feeder on which the recording material that an image of an even-numbered page is formed is placed with facing upward,

wherein the controller is further configured to determine a printing order of an odd-numbered page according to one feeder to be used between the first feeder and the second feeder.

6. The image forming apparatus according to claim 1,

wherein the discharge tray includes a first discharge tray and a second discharge tray;

wherein the controller is further configured to select the discharge tray as a discharge destination of a recording material with an image of an odd-numbered page formed according to the one feeder to be used feeder.

7. The image forming apparatus according to claim 3,

wherein the controller is further configured to end the print job without controlling the image forming unit to form an image if the user does not instruct to perform processing in response to the notification.

8. The image forming apparatus according to claim 1,

wherein the print job includes print mode data indicating a print mode for performing printing according to a characteristic of a recording material, and

wherein the controller is further configured to control the image forming unit to form an image if the characteristic of the recording material supports a print mode indicated by the print mode data, and to end processing without controlling the image forming unit to form an image if the characteristic of the recording material does not support the print mode.

9. The image forming apparatus according to claim 8,

wherein the controller is further configured to control the image forming unit to start forming an image on a first side of the recording material if the double-sided printing is specified by the print job and the recording material does not support the double-sided printing.

10. An image forming method which is performed by an image forming apparatus which comprises a feeder configured to feed a recording material, an image forming unit configured to form an image on the recording material according to image data,

a discharge tray to which the recording material with the image formed is discharged, and a detector configured to detect a characteristic of the recording material fed by the feeder, and configured to perform, based on a print job to be input, double-sided printing in which front and back of a recording material is reversed on a conveying path after a first side of the recording material is printed and thereafter a second side of the recording material is printed, or single-sided printing in which a first side of a recording material is printed and the recording material is discharged, the method comprising:

determining whether the recording material supports the double-sided printing or not based on a detection result of the detector for the recording material fed by the feeder,

forming, by the image forming unit, an image of an even-numbered page of the print job on the first side of the recording material in an order of page number and discharging a recording material with an image formed on a first side to a discharge tray if it is determined that double-sided printing is specified by the print job and the recording material does not support the double-sided printing,

prompting a user to place the discharged recording material on a feeder for second side printing, and

forming, by the image forming unit, an image of an odd-numbered page on the second side of the recording material with the image formed on the first side which is fed from a feeder for the second side printing.