Image forming apparatus with removal of dust resulting from a parting agent contained in toner
AssigneeCanon Kabushiki Kaisha
InventorKoji Nojima
Life of this patent
Estimating the term…
Abstract
A control portion of an image forming apparatus causes an operation of a first fan start and then causes a second fan to start. The time when the operation of the second fan starts is from a predetermined time before the time when the leading end of one sheet reaches a fixing nip to the time when the rear end of the one sheet passes through the fixing nip. In this way, since the second fan operates after the first fan operates, fine particle dust is hardly discharged to the outside of the image forming apparatus, and it is possible to suppress dew condensation inside the image forming apparatus.
Claims16
An image forming apparatus comprising:
- an image forming portion for forming a toner image on a recording material by using toner containing a parting agent;
- a transfer portion configured to transfer the toner image formed by said image forming portion to a sheet at a transfer nip portion;
- a fixing portion configured to heat fixing the toner image transferred by said transfer portion on the sheet at a fixing nip portion;
- a duct provided with a suction opening opposite to a sheet feeding passage between said transfer nip portion and said fixing nip portion;
- a filter provided on said duct;
- a first fan configured to discharge an air taken into said duct from said suction opening to an outside;
- a second fan configured to discharge an air in a neighborhood of a sheet exit of said fixing portion;
- a control portion configured to control operations of said first fan and said second fan,
- wherein said control portion is constructed to perform operations such that in a case in which a signal for forming the image on the sheet is inputted, an operation of said first fan is started before the fixing portion reaches a target temperature, and an operation of said second fan is started before a first sheet passes through said fixing nip portion after the operation of said first fan is started.
Dependencies are inferred from the claim text.