# US 7,412,182 B2 · Image forming apparatus with setting of an operating condition of at least one image heating device

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- Number: US 7,412,182 B2
- Document ID: US7412182B2
- Status: Granted
- Kind: B2
- Application number: 12/014,315
- Filed: 2008-01-15
- Published: 2008-05-22
- Granted: 2008-08-12
- Earliest claimed: 2004-10-25
- Assignees: Canon Kabushiki Kaisha
- Inventors: Yasuhiro Hayashi; Hiroto Nishihara; Naoto Watanabe; Yukio Yokoyama; Takako Hanada; Kuniyasu Kimura
- Web page: https://patentgrep.com/patent/US7412182B2

## CPC

- G03G 15/2046: {specially for the influence of heat loss, e.g. due to the contact with the copy material or other roller}
- G03G 15/5004: {Power supply control, e.g. power-saving mode, automatic power turn-off}
- G03G 2215/00742: of sheet weight
- G03G 2215/0081: Gloss level being selectable
- G03G 2215/00924: two or more parallel feed paths
- G03G 2215/2006: Plurality of separate fixing areas
- G03G: ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY

## Abstract

An image forming system has an image forming device, a first image heating device for heating a toner image at a first nip to maintain a target temperature, a second image heating device for heating a toner image at a second nip to maintain a target temperature, a selecting device for selecting a first image forming mode in which only the first image heating device is used for a image heating process and a second image forming mode in which the first image heating device and the second image heating device are used for the image heating process, and a delaying device for making timing at which the target temperature of the first image heating device is lowered in a stand by state later than a timing at which the target temperature of the second image heating device is lowered in the stand by state.

## Claims

### Claim 1

A image forming system comprising:
a image forming device for forming a toner image on a recording material;
a first image heating device for heating the toner image on the recording material at a first nip, said first image heating device being heated by a first heater so as to maintain a target temperature;
a second image heating device for heating the toner image on the recording material, which has been heated by said first image heating device, at a second nip provided at a position is different from the first nip, said second image heating device being heated by a second heater so as to maintain a target temperature;
a selecting device for selecting one of image forming modes including a first image forming mode in which only said first image heating device is used for a image heating process and a second image forming mode in which said first image heating device and said second image heating device are used for the image heating process; and
a delaying device for making timing at which the target temperature of said first image heating device is lowered in a stand by state later than a timing at which the target temperature of said second image heating device is lowered in the stand by state.

### Claim 2 (depends on 1)

A system according to claim 1, wherein said delaying device delays timing at which a electric power supply to said first image heating device is stopped in the stand by state later than timing at which a electric power supply to said second image heating device is stopped in the stand by state.

### Claim 3 (depends on 1)

A system according to claim 1, wherein said selecting device selects the one of image forming modes based on a type of the recording material.

### Claim 4 (depends on 1)

A system according to claim 1, further comprising a first feeding path for passing the recording material through only said first image heating device for the image heating process and a second feeding path for passing the recording material through said first image heating device and said second image heating device for the image heating process.