Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorAkinori Tanaka
Life of this patent
Estimating the term…
Abstract
In case a fixing speed is lower than a transferring speed, the individual conveyor units are controlled such that, while a downstream conveyor unit (61) is conveying a sheet (S1) being fixed at the same speed (V2) as the fixing speed, an upstream conveyor unit (60) may convey the succeeding sheet (S2) at the same speed (V1) as the transferring speed. As a result, the spacing of the two sheets in a fixing unit (9) can be sufficiently narrowed to improve the image forming efficiency. Moreover, the transferring speed need not be decelerated according to the fixing speed. It is, therefore, possible to prevent the deterioration in the image quality and to shorten the image forming time period of the first sheet.
Claims21
An image forming apparatus comprising:
- transfer means for transferring an image to a sheet at a transferring speed;
- fixing means for fixing and feeding the sheet at a fixing speed lower than the transferring speed;
- and
- conveyor means for conveying the sheet from said transfer means to said fixing means,
- wherein said conveyor means includes a plurality of conveyor units, which are so controlled that, while a downstream conveyor unit is conveying a sheet being fixed at the same speed as said fixing speed, an upstream conveyor unit may convey the succeeding sheet at the same speed as said transferring speed.
An image forming apparatus comprising:
- transfer means for transferring an image to a sheet at a specified transferring speed;
- fixing means capable of changing a fixing speed in accordance with the kind of the sheet;
- and
- conveyor means for conveying the sheet from said transfer means to said fixing means,
- wherein said conveyor means includes a plurality of conveyor units, which are so controlled in case the fixing speed is lower than the transferring speed that, while a downstream conveyor unit is conveying a sheet being fixed at the same speed as said fixing speed, an upstream conveyor unit may convey the succeeding sheet at the same speed as said transferring speed.
An image forming apparatus comprising:
- transfer means for transferring an image to a sheet at a specified transferring speed;
- fixing means capable of changing a fixing speed in accordance with the kind of the sheet;
- and
- conveyor means for conveying the sheet from said transfer means to said fixing means,
- wherein said conveyor means includes a plurality of conveyor units, which are so controlled in case the fixing speed is lower than the transferring speed that only the conveyor unit conveying the sheet being fixed may take the same speed as said fixing speed.
An image forming apparatus comprising:
- transfer means for transferring an image to a sheet at a specified transferring speed;
- fixing means capable of changing a fixing speed in accordance with the kind of the sheet;
- and
- conveyor means for conveying the sheet from said transfer means to said fixing means,
- wherein said conveyor means includes a plurality of conveyor units, which are so controlled that the spacing between the preceding sheet and the succeeding sheet in said fixing means in case the fixing speed is lower than the transferring speed is narrower than that in case the transferring speed and the fixing speed are equal.
Dependencies are inferred from the claim text.