Image forming apparatus that can enhance usability by reducing the number of times a chart is placed on a reading device

Patent metadata

Field	Value
Publication number	US-11681247-B2
Application number	US-202117545898-A
Country	US
Kind code	B2
Filing date	Dec 8, 2021
Priority date	Dec 18, 2020
Publication date	Jun 20, 2023
Grant date	Jun 20, 2023

Abstract

An image forming apparatus that includes an image bearing member which can bear a toner image, a transfer member used to transfer a toner image onto a recording material from the image bearing member, and a reading device which reads density information of images on recording material disposed on a platen. The image forming apparatus forms a first chart on a first recording material and a second chart on a second recording material by sequentially transferring a plurality of test images while applying a plurality of test voltages to the transfer member. The two charts are read by the reading device and the transfer voltage is adjusted based on the reading result.

First claim

What is claimed is:

1. An image forming apparatus comprising:
an image bearing member configured to bear a toner image;
a transfer member configured to transfer a toner image onto a recording material from the image bearing member;
an application unit configured to apply a voltage to the transfer member;
a platen on which a recording material is disposed when an image on the recording material is to be read;
a reading device configured to read an image on a recording material disposed on the platen; and
a control unit configured to execute an adjustment mode for adjusting a transfer voltage to be applied to the transfer member,
wherein, in the adjustment mode, the control unit outputs a first chart formed by transferring a plurality of first test images to a first recording material by applying a plurality of first test voltages to the transfer member, and a second chart formed by transferring a plurality of second test images to a second recording material by applying a plurality of second test voltages to the transfer member, and is configured to adjust the transfer voltage applied to the transfer member based on a reading result of the reading device when the first recording material and the second recording material set together on the platen are read by the reading device.

2. The image forming apparatus according to claim 1 , further comprising a display unit configured to display information prompting an operator to set the first recording material and the second recording material together on the platen in the adjustment mode.

3. The image forming apparatus according to claim 1 ,
wherein first identification information for identifying an orientation of the first chart is formed on a surface on which the first test images are formed, and second identification information for identifying an orientation of the second chart is formed on a surface on which the second test images are formed, and
wherein the control unit is configured to adjust the transfer voltage based on a reading result of the first test images, the second test images, the first identification information, and the second identification information that is obtained by the reading device.

4. The image forming apparatus according to claim 1 ,
wherein first identification information for identifying page information of the first chart is formed on a surface on which the first test images are formed, and second identification information for identifying page information of the second chart is formed on a surface on which the second test images are formed, and
wherein the control unit is configured to adjust the transfer voltage based on a reading result of the first test images, the second test images, the first identification information and the second identification information that is obtained by the reading device.

5. An image forming apparatus comprising:
an image bearing member configured to bear a toner image;
a transfer member configured to transfer a toner image onto a recording material from the image bearing member;
an application unit configured to apply a voltage to the transfer member;
a reading device configured to read an image on a recording material; and
a control unit configured to execute an adjustment mode for adjusting a transfer voltage to be applied to the transfer member,
wherein, in the adjustment mode, the control unit outputs a first chart formed by transferring a plurality of first test images to a first recording material by applying a plurality of first test voltages to the transfer member, and a second chart formed by transferring a plurality of second test images to a second recording material by applying a plurality of second test voltages to the transfer member, and forms first identification information for identifying an orientation of the first chart on a surface on which the first test images are formed, and second identification information for identifying an orientation of the second chart is formed on a surface on which the second test images are formed, and
wherein the control unit is configured to adjust the transfer voltage based on a reading result of the first test images, the second test images, the first identification information, and the second identification information that is obtained by the reading device.

6. The image forming apparatus according to claim 5 ,
wherein third identification information for identifying a page of the first chart is formed on a surface on which the first test images are formed, and fourth identification information for identifying a page of the second chart is formed on a surface on which the second test images are formed, and
wherein the control unit is configured to adjust the transfer voltage based on a reading result of the third identification information and the fourth identification information that is obtained by the reading device.

7. The image forming apparatus according to claim 6 , wherein the third identification information and the fourth identification information are patch images formed using toners of different colors.

8. The image forming apparatus according to claim 6 , wherein the first identification information and the third identification information are formed at different positions.

9. The image forming apparatus according to claim 8 , wherein, in a width direction orthogonal to an array direction of the plurality of first test images, the first identification information and the third identification information are arranged.

10. The image forming apparatus according to claim 5 , wherein the reading device includes a platen on which a recording material is disposed, and, in the adjustment mode, the control unit is configured to adjust the transfer voltage applied to the transfer member based on the reading result when the first recording material and the second recording material set together on the platen are read by the reading device.

11. The image forming apparatus according to claim 10 , wherein, in the adjustment mode, whether the first recording material is set in a first direction on the platen or the first recording material is set in a second direction, opposite to the first direction, on the platen, the control unit is configured to adjust the transfer voltage based on the reading result of the first test images, the second test images, the first identification information, and the second identification information that is obtained by the reading device.

12. The image forming apparatus according to claim 5 , wherein the reading device includes a conveyance portion configured to sequentially and automatically convey the first recording material and the second recording material to the reading unit, and a reading portion configured to read an image on a recording material sequentially and automatically conveyed by said conveyance portion, and in the adjustment mode, the control unit is configured to adjust the transfer voltage applied to the transfer member based on the reading result when the first recording material and the second recording material sequentially and automatically conveyed by said conveyance portion are read by the reading portion.

13. The image forming apparatus according to claim 5 , wherein the first identification information and the second identification information are belt-like patch images formed using black toner.

14. An image forming apparatus comprising:
an image bearing member configured to bear a toner image;
a transfer member configured to transfer a toner image onto a recording material from the image bearing member;
an application unit configured to apply a voltage to the transfer member;
a reading devi

Assignees

• Canon Kk

Inventors

• Kobayashi Masato
• Kato Wataru

Classifications

• G03G15/1645

  Arrangements for controlling the amount of charge · CPC title

• G03G15/0266

  Arrangements for controlling the amount of charge · CPC title

• G03G15/5062 Primary

  by measuring the characteristics of an image on the copy material · CPC title

• G03G15/1675

  with means for controlling the bias applied in the transfer nip · CPC title

• G03G15/1665 Primary

  by introducing the second base in the nip formed by the recording member and at least one transfer member, e.g. in combination with bias or heat · CPC title