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US 7,609,983 B2Granted
Image forming apparatus and sheet heating apparatus
AssigneeCanon Kabushiki Kaisha
InventorsHidehiko Kinoshita, Jun Yamaguchi, Atsushi Nakagawa, Masaaki Moriya
Life of this patent
Estimating the term…
Abstract
When an abnormality factor occurs in a second heating device, a sheet located upstream of a branch portion is discharged onto a discharge tray through a second conveying path. After the abnormality factor in the second heating device is removed and the sheet discharged to the discharge tray through the second conveying path is set in a paper refeeding tray, a sheet feeding portion feeds the sheet set in the paper refeeding tray to the second heating device.
Claims13
An image forming apparatus comprising:
- a first heating device which heats a sheet with a toner image formed thereon;
- a second heating device which heats said sheet heated by said first heating device;
- a first conveying path which conveys said sheet conveyed from said first heating device to said second heating device;
- a second conveying path which branches from said first conveying path at a location upstream of said second heating device in said first conveying path for conveyance of said sheet without conveying it to said second heating device;
- a discharge tray to which said sheet being conveyed on said second conveying path is discharged;
- a feeding portion which feeds sheets put on a paper refeeding tray;
- and
- a feeding conveying path which conveys a sheet fed by said feeding portion to said second heating device, said feeding conveying path having a downstream portion merged into said first conveying path at a location between said first heating device and said second heating device;
- an abnormality control portion which issues an abnormality factor that occurs in said second heating device, and a sheet located upstream of said branch portion in said first conveying path is discharged to said discharge tray through said second conveying path;
- and
- an annunciation portion is provided which serves to inform that said sheet discharged to said discharge tray should be set in said refeeding tray when said sheet has been discharged to said discharge tray upon occurrence of the abnormality factor in said second heating device.
8 more elements
An image forming apparatus comprising:
- a first heating device which heats a sheet with a toner image formed thereon;
- a second heating device which heats said sheet heated by said first heating device;
- a first conveying path which conveys said sheet conveyed from said first heating device to said second heating device;
- a second conveying path which branches from said first conveying path at a branch portion upstream of said second heating device in said first conveying path for discharging said sheet without conveying it to said second heating device;
- a discharge tray to which said sheet being conveyed on said second conveying path is discharged;
- a feeding portion which feeds sheets put on a paper refeeding tray;
- and
- a feeding conveying path which conveys a sheet fed by said feeding portion to said second heating device, said feeding conveying path having a downstream portion merged into said first conveying path at a location between said first heating device and said second heating device;
- an abnormality control portion which issues an abnormality factor that occurs in said second heating device, and a sheet existing between said branch portion and said second heating device in said first conveying path is conveyed upstream of said branch portion, and the sheet thus conveyed upstream of said branch portion is discharged onto said discharge tray through said second conveying path.
6 more elements
A sheet heating apparatus comprising:
- a first conveying path which conveys a sheet being conveyed from an image forming apparatus main body that includes an image forming portion for forming a toner image on said sheet and a first heating device for heating said sheet having said toner image formed thereon by means of said image forming portion;
- a second heating device which heats said sheet being conveyed on said first conveying path;
- a second conveying path which branches from said first conveying path at a branch portion upstream of said second heating device in said first conveying path for discharging said sheet without conveying it to said second heating device;
- a discharge tray to which said sheet being conveyed on said second conveying path is discharged;
- a feeding portion which feeds sheets put on a paper refeeding tray;
- and
- a feeding conveying path which conveys a sheet fed by said feeding portion to said second heating device, said feeding conveying path having a downstream portion merged into said first conveying path at a location between said first heating device and said second heating device;
- an abnormality control portion which issues an abnormality factor that occurs in said second heating device, and a sheet located upstream of said branch portion is discharged onto said discharge tray through said second conveying path;
- and
- after said abnormality factor in said second heating device is removed and said sheet discharged to said discharge tray through said second conveying path is set in said paper refeeding tray, said feeding conveying path feeds the sheet set in said paper refeeding tray to said second heating device.
7 more elements
Dependencies are inferred from the claim text.