Conveying device, image forming apparatus incorporating the conveying device, position detecting method of the image forming apparatus, and recording medium

Patent metadata

Field	Value
Publication number	US-11186456-B2
Application number	US-201916356667-A
Country	US
Kind code	B2
Filing date	Mar 18, 2019
Priority date	Mar 30, 2018
Publication date	Nov 30, 2021
Grant date	Nov 30, 2021

Abstract

A conveying device includes a sensor to read a sheet to be conveyed, a first conveyor arranged on an upstream side from the sensor in a sheet conveying direction of the sheet, a second conveyor arranged on a downstream side from the sensor in the sheet conveying direction, and correcting circuitry to correct a distance of the sheet having an error detected when the sensor reads the sheet conveyed by the first conveyor and the second conveyor, to an actual distance. The correcting circuitry uses at least a first correction value correcting a distance read by the sensor when the first conveyor conveys the sheet and a second correction value correcting a distance read by the sensor when the second conveyor conveys the sheet.

First claim

What is claimed is:

1. A conveying device comprising:
a sensor configured to read a sheet to be conveyed;
a first conveyor arranged on an upstream side from the sensor in a sheet conveying direction of the sheet;
a second conveyor arranged on a downstream side from the sensor in the sheet conveying direction of the sheet; and
correcting circuitry configured to correct a distance of the sheet having an error detected when the sensor reads the sheet conveyed by the first conveyor and the second conveyor, to an actual distance,
the correcting circuitry configured to use a first correction value correcting a distance read by the sensor when the first conveyor conveys the sheet and a second correction value correcting a distance read by the sensor when the second conveyor conveys the sheet.

2. The conveying device according to claim 1 ,
wherein the correcting circuitry is configured to correct a distance that the sensor has read in accordance with a length of the sheet and a position of a pattern printed on the sheet.

3. The conveying device according to claim 1 , further comprising:
a memory configured to store sheet information relating to the sheet,
wherein the correcting circuitry is configured to calculate the first correction value and the second correction value in accordance with the sheet information.

4. The conveying device according to claim 3 ,
wherein the sheet information includes information relating to a thickness of the sheet.

5. The conveying device according to claim 3 ,
wherein the sheet information includes information relating to a type of the sheet.

6. The conveying device according to claim 1 ,
wherein a correction value corrected by the correcting circuitry includes a third correction value to correct a distance of the sheet that the sensor has read when both the first conveyor and the second conveyor convey the sheet.

7. An image forming apparatus comprising:
the conveying device according to claim 1 ; and
an image forming device configured to form an image on a sheet.

8. A position detection method comprising:
reading, with a sensor, a sheet to be conveyed by a first conveyor and a second conveyor that are arranged on an upstream side and a downstream side, respectively, from the sensor in a sheet conveying direction of the sheet; and
correcting a distance of the sheet having an error detected by the reading, to an actual distance,
the correcting using a first correction value correcting a distance read by the sensor when the first conveyor conveys the sheet and a second correction value correcting a distance read by the sensor when the second conveyor conveys the sheet.

9. A non-transitory recording medium storing computer-readable program code which, when executed by a computer, cause the computer to perform a method, the method comprising:
reading, with a sensor, a sheet to be conveyed by a first conveyor and a second conveyor that are arranged on an upstream side and a downstream side, respectively, from the sensor in a sheet conveying direction of the sheet; and
correcting a distance of the sheet having an error detected when the sensor reads the sheet conveyed by the first conveyor and the second conveyor, to an actual distance,
the correcting using a first correction value correcting a distance read by the sensor when the first conveyor conveys the sheet and a second correction value correcting a distance read by the sensor when the second conveyor conveys the sheet.

Assignees

• Ishii Tatsuya
• Chiba Takehiro
• Karikusa Yuji
• Ricoh Co Ltd

Inventors

• Ishii Tatsuya
• Chiba Takehiro
• Karikusa Yuji

Classifications

• B65H2513/52

  Age; Duration; Life time or chronology of event · CPC title

• H04N1/00745

  Detecting the leading or trailing ends of a moving sheet · CPC title

• B65H2701/1313

  trailing edge · CPC title

• B65H5/06 Primary

  by rollers {or balls, e.g. between rollers (transport by suction rollers B65H5/226)} · CPC title

• B65H5/02

  by belts or chains {, e.g. between belts or chains (by combinations of endless conveyors and grippers B65H5/085; by suction belts B65H5/224)} · CPC title