Image forming apparatus, diagnostic method, and non-transitory recording medium

Patent metadata

Field	Value
Publication number	US-12422771-B2
Application number	US-202418583039-A
Country	US
Kind code	B2
Filing date	Feb 21, 2024
Priority date	Feb 27, 2023
Publication date	Sep 23, 2025
Grant date	Sep 23, 2025

Abstract

An image forming apparatus includes processing circuitry and a sensor. The processing circuitry controls formation of an image of an evaluation pattern on a transfer object. The sensor measures the image of the evaluation pattern formed on the transfer object. The processing circuitry presents a determination result of a cause of a failure based on a comparison between a reference value serving as a reference of the evaluation pattern and a measured value of the image of the evaluation pattern by the sensor.

First claim

The invention claimed is:

1. An image forming apparatus, comprising:
processing circuitry configured to control formation of an image of an evaluation pattern on a transfer object; and
a sensor configured to measure the image of the evaluation pattern formed on the transfer object,
wherein the processing circuitry is configured to present a determination result of a cause of a failure based on a comparison between a reference value serving as a reference of the evaluation pattern and a measured value of the image of the evaluation pattern by the sensor, and
wherein when there is no difference in the measured value beyond an acceptable range from the reference value, the processing circuitry is configured to control execution of printing of a second evaluation pattern on a transfer material supplied from each of one or more supply units.

2. The image forming apparatus according to claim 1 ,
wherein when there is a difference in the measured value beyond the acceptable range from the reference value, the determination result indicates that the cause exists in writing or transfer.

3. The image forming apparatus according to claim 1 ,
wherein a position misalignment beyond the acceptable range in some of a plurality of print results of the second evaluation pattern printed on the transfer material supplied from each of the one or more supply units indicates that the cause exists in any one or more of the one or more supply units.

4. The image forming apparatus according to claim 1 ,
wherein a position misalignment beyond the acceptable range in a plurality of print results of the second evaluation pattern printed on the transfer material supplied from each of the one or more supply units indicates that the cause exists in a conveyance path downstream from the one or more supply units in a direction in which the transfer material is supplied from each of the one or more supply units.

5. The image forming apparatus according to claim 1 ,
wherein the transfer object is a transfer belt,
the sensor includes a primary transfer sensor to measure an image primarily transferred to the transfer belt and a secondary transfer sensor to measure an image secondarily transferred from the transfer belt, and
the determination result indicates that the cause exists before primary transfer or in secondary transfer based on a result of a comparison of the primary transfer sensor and a result of a comparison of the secondary transfer sensor.

6. The image forming apparatus according to claim 1 ,
wherein formation of the image of the evaluation pattern starts in response to entry to a diagnostic mode, and the processing circuitry displays the determination result on a display device included in the image forming apparatus.

7. A diagnostic method for an image forming apparatus, the diagnostic method comprising:
forming an image of an evaluation pattern on a transfer object;
measuring, with a sensor, the image of the evaluation pattern formed on the transfer object;
presenting a determination result of a cause of a failure based on a comparison between a reference value serving as a reference of the evaluation pattern and a measured value of the evaluation pattern by the sensor; and
controlling execution of printing of a second evaluation pattern on a transfer material supplied from each of one or more supply units when there is no difference in the measured value beyond an acceptable range from the reference value.

8. A non-transitory recording medium storing program code which, when executed by one or more processors of an image forming apparatus, causes the one or more processors to perform a method, the method comprising:
forming an image of an evaluation pattern on a transfer object;
measuring, with a sensor, the image of the evaluation pattern formed on the transfer object;
presenting a determination result of a cause of a failure based on a comparison between a reference value serving as a reference of the evaluation pattern and a measured value of the evaluation pattern by the sensor; and
controlling execution of printing of a second evaluation pattern on a transfer material supplied from each of one or more supply units when there is no difference in the measured value beyond an acceptable range from the reference value.

Assignees

• Ono Koichi
• Uematsu Akira
• Kamijo Shinya
• Ricoh Co Ltd

Inventors

• Ono Koichi
• Uematsu Akira
• Kamijo Shinya

Classifications

• G03G2215/00409

  Transfer device · CPC title

• G03G15/5016

  User-machine interface; Display panels; Control console · CPC title

• G03G15/55

  Self-diagnostics; Malfunction or lifetime display · CPC title

• G03G15/5058 Primary

  using a test patch · CPC title