# US 8,571,424 B2 · Image forming apparatus

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- Number: US 8,571,424 B2
- Document ID: US8571424B2
- Status: Granted
- Kind: B2
- Application number: 12/946,223
- Filed: 2010-11-15
- Published: 2011-06-16
- Granted: 2013-10-29
- Earliest claimed: 2009-12-14
- Assignees: Canon Kabushiki Kaisha
- Applicants: Yuki Sugiyama; Takeshi Shimba
- Inventors: Yuki Sugiyama; Takeshi Shimba
- Web page: https://patentgrep.com/patent/US8571424B2

## CPC

- G03G 21/14: Electronic sequencing control
- 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 15/6564: {with correct timing of sheet feeding}
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An image forming apparatus that reduces a time period during which no image is formed due to a margin in leading end portion, by calculating the margin in leading end portion from position information of an image and moving forward output timing of a /TOP signal according to the margin in leading end portion.

## Claims

### Claim 1

An image forming apparatus comprising:
an image forming unit configured to form an image; and
a control unit configured to control timing to send a signal to request image information for causing the image forming unit to form an image,
wherein the control unit controls the timing to send the signal to request the image information according to information on a margin from a leading end of a recording medium to a leading end of the image formed on the recording medium in a conveying direction of the recording medium so that the timing to send the signal to request the image information is earlier than timing to request predetermined image information after preparation for forming an image is completed.

### Claim 2 (depends on 1)

An image forming apparatus according to claim 1, wherein the control unit is configured to receive position information on the image to be formed by the image forming unit and obtain the information on the margin according to the position information of the image.

### Claim 3 (depends on 1)

An image forming apparatus according to claim 1,
wherein the image forming unit includes a plurality of image bearing members and a plurality of developing units configured to develop an image of a plurality of colors on the plurality of image bearing members, and
wherein the control unit controls the timing to send the signal to request the image information based on information on a margin of a color with a shortest length of a margin area in the conveying direction of the recording medium.

### Claim 4 (depends on 3)

An image forming apparatus according to claim 3, wherein the control unit controls, based on information on a margin of a color with a latest timing to finish rendering a trailing end of the image to be formed on the recording medium in the conveying direction of the recording medium, an operation to stop the plurality of image bearing members and the plurality of developing units so that the operation starts.

### Claim 5 (depends on 1)

The image forming apparatus according to claim 1, wherein the control unit controls timing to start conveying a recording medium based on the timing to send the signal to request the image information.

### Claim 6

An image forming apparatus comprising:
an image forming unit configured to form an image; and
a control unit configured control timing to send a signal to request image information for causing the image forming unit to form an image,
wherein the image forming unit includes a plurality of image bearing members and a plurality of developing units configured to develop an image of a plurality of colors on the plurality of image bearing members, and
wherein the control unit controls the timing to send the signal to request the image information according to information on a margin from a leading end of a recording medium to a leading end of the image formed on the recording medium in a conveying direction of the recording medium so that the timing to send the signal to request the image information is earlier than timing to request predetermined image information after preparation for forming an image is completed.