# US 8,351,803 B2 · Image forming apparatus

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- Number: US 8,351,803 B2
- Document ID: US8351803B2
- Status: Granted
- Kind: B2
- Application number: 12/827,198
- Filed: 2010-06-30
- Published: 2011-01-06
- Granted: 2013-01-08
- Earliest claimed: 2009-07-02
- Assignees: Brother Kogyo Kabushiki Kaisha
- Inventors: Masataka Yamazaki
- Web page: https://patentgrep.com/patent/US8351803B2

## CPC

- G03G 15/234: {by inverting and refeeding the image receiving material with an image on one face to the recording member to transfer a second image on its second face, e.g. by using a duplex tray; Details of duplex trays or inverters}
- G03G 15/50: {Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode copiers, microprocessor control (sequencing control G03G21/14)}
- G03G 2215/00434: Refeeding tray or cassette
- G03G 2215/00586: duplex mode
- G03G 2215/00599: Timing, synchronisation
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An image forming apparatus is provided. The image forming apparatus includes: a printing section configured to perform duplex printing including printing N sheet on a first side thereof and subsequently printing M sheet on a second side thereof, wherein M is equal to or smaller than N, a suspension section which is configured to suspend the duplex printing in response to receiving a request for image adjustment during the duplex printing, while the sheet having the first face thereof printed is caused to stay in the image forming apparatus during the suspension, a correction section which is configured to update a correction data for image adjustment while the duplex printing is suspended by the suspension section, and a restarting section which is configured to restart the duplex printing suspended by the suspension section after the correction data has been updated by the correction section.

## Claims

### Claim 1

An image forming apparatus comprising:
a printing section configured to perform duplex printing including printing N sheet on a first side thereof and subsequently printing M sheet on a second side thereof, wherein M is equal to or smaller than N;
a suspension section which is configured to suspend the duplex printing in response to receiving a request for image adjustment during the duplex printing, while the sheet having the first side thereof printed is caused to stay in the image forming apparatus during the suspension;
a correction section which is configured to update a correction data for image adjustment while the duplex printing is suspended by the suspension section;
a restarting section which is configured to restart the duplex printing suspended by the suspension section after the correction data has been updated by the correction section; and
a storage section which is configured to store a correction data acquired before the suspension of the duplex printing and to store the updated correction data,
wherein the printing section prints the second side of the sheet which is caused to stay in the apparatus during suspension of the duplex printing based on the correction data acquired before the suspension; and
wherein the printing section is configured to print a sheet fed after the restart of the duplex printing or to print a job started after the restart of the duplex printing, based on the correction data updated by the correction section.

### Claim 2 (depends on 1)

The image forming apparatus according to claim 1,
wherein the printing section is configured to repeatedly feed a sheet while fulfilling a relationship that N is equal to M, from start of the duplex printing.

### Claim 3 (depends on 1)

The image forming apparatus according to claim 1,
wherein the duplex printing includes feeding sheets while fulfilling a relationship that N is larger than M.

### Claim 4 (depends on 1)

The image forming apparatus according to claim 1,
wherein, when a request for image adjustment is received while an unprinted data value is equal to or smaller than a threshold value, the correction section updates the correction data after printing of the unprinted data without suspending the duplex printing.

### Claim 5 (depends on 1)

The image forming apparatus according to claim 1,
wherein the correction section is configured to form a test image on an image carrier, measure the test image, and determine a correction data in accordance with a result of the measurement.

### Claim 6 (depends on 1)

The image forming apparatus according to claim 1,
wherein the printing section prints the second side of the sheet based on the same correction data used to print the first side of the sheet.

### Claim 7 (depends on 1)

The image forming apparatus according to claim 1,
wherein the printing section is configured to perform duplex printing of a print job comprising a plurality of sheets, the correction section updates the correction data after the printing section completes printing of the print job.