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US 8,428,507 B2Granted
Sheet feeding device and image forming apparatus having the same
AssigneeKyocera Mita Corporation
InventorHideaki Doyou
Life of this patent
Estimating the term…
Abstract
A sheet feeding device includes a first conveying roller conveying the sheet, a second conveying roller conveying the sheet conveyed from the first conveying roller, a first driving gear having a first number of teeth, and a second driving gear having a second number of teeth. When a first meshing frequency defined by multiplication of the first number of teeth and the number of rotations of the first driving gear is defined as A, and a second meshing frequency defined by multiplication of the second number of teeth and the number of rotations of the second driving gear is defined as B, the first meshing frequency A and the second meshing frequency B are set so as to satisfy the following expression (1):A>B.
Claims18
A sheet feeding device, comprising:
- a sheet conveying path in which a sheet is conveyed in a predetermined direction;
- a first conveying roller pair having a first conveying roller disposed in the sheet conveying path and conveying the sheet in the predetermined direction;
- a second conveying roller pair having a second conveying roller disposed downstream of the first conveying roller in the sheet conveying path and conveying the sheet, conveyed from the first conveying roller, in the predetermined direction;
- a first driving gear attached coaxially to the first conveying roller for rotation therewith and having a first number of teeth;
- a second driving gear attached coaxially to the second conveying roller for rotation therewith and having a second number of teeth;
- and
- a drive source driving the first driving gear and the second driving gear,
- wherein, when an end of the sheet on an upstream side in the predetermined direction is sandwiched by the first conveying roller pair and an end of the sheet on a downstream side in the predetermined direction is sandwiched by the second conveying roller pair, the expression A>B is satisfied, where A is a first meshing frequency defined by multiplication of the first number of teeth and the number of rotations of the first driving gear and B is a second meshing frequency defined by multiplication of the second number of teeth and the number of rotations of the second driving gear.
5 more elements
A fixing device, comprising:
- a sheet discharge path in which a sheet is discharged in a predetermined direction;
- a fixing roller disposed in the sheet discharge path and performing fixation to a toner image on the sheet;
- a pressing roller disposed to face the fixing roller in contact therewith with the sheet discharge path therebetween and forming a fixing nip portion with the fixing roller;
- a discharging roller disposed downstream of the fixing roller in the sheet discharge path and discharging the sheet, subjected to the fixation, in the predetermined direction;
- a fixing roller side driving gear attached coaxially to the fixing roller for rotation therewith and having a first number of teeth;
- and
- a discharging roller side driving gear attached coaxially to the discharging roller for rotation therewith and having a second number of teeth, wherein
- when a first meshing frequency defined by multiplication of the first number of teeth and the number of rotations of the fixing roller side driving gear is defined as F1, and a second meshing frequency defined by multiplication of the second number of teeth and the number of rotations of the discharging roller side driving gear is defined as F2, the first meshing frequency F1 and the second meshing frequency F2 are set so as to satisfy the following expression (4):
- F1>F2 (4).
6 more elements
An image forming apparatus, comprising:
- an image forming section forming an image on a sheet;
- and
- a sheet feeding device feeding the sheet to the image forming section,
- the sheet feeding device including:
- a sheet conveying path in which a sheet is conveyed in a predetermined direction;
- a first conveying roller pair having a first conveying roller disposed in the sheet conveying path and conveying the sheet in the predetermined direction;
- a second conveying roller pair having a second conveying roller disposed downstream of the first conveying roller in the sheet conveying path and conveying the sheet, conveyed from the first conveying roller, in the predetermined direction;
- a first driving gear attached coaxially to the first conveying roller for rotation therewith and having a first number of teeth;
- a second driving gear attached coaxially to the second conveying roller for rotation therewith and having a second number of teeth;
- and
- a drive source driving the first driving gear and the second driving gear,
- wherein, when an end of the sheet on an upstream side in the predetermined direction is sandwiched by the first conveying roller pair and an end of the sheet on a downstream side in the predetermined direction is sandwiched by the second conveying roller pair, the expression A>B is satisfied, where A is a first meshing frequency defined by multiplication of the first number of teeth and the number of rotations of the first driving gear and B is a second meshing frequency defined by multiplication of the second number of teeth and the number of rotations of the second driving gear.
9 more elements
An image forming apparatus, comprising:
- an image forming section forming a toner image on a sheet;
- and
- a fixing device fixing the toner image, formed on the sheet, onto the sheet,
- the fixing device including:
- a sheet discharge path in which a sheet is discharged in a predetermined direction;
- a fixing roller disposed in the sheet discharge path and performing fixation to a toner image on the sheet;
- a pressing roller disposed to face the fixing roller in contact therewith with the sheet discharge path therebetween and forming a fixing nip portion with the fixing roller;
- a discharging roller disposed downstream of the fixing roller in the sheet discharge path and discharging the sheet, subjected to the fixation, in the predetermined direction;
- a fixing roller side driving gear attached coaxially to the fixing roller for rotation therewith and having a first number of teeth;
- and
- a discharging roller side driving gear attached coaxially to the discharging roller for rotation therewith and having a second number of teeth, wherein
- when a first meshing frequency defined by multiplication of the first number of teeth and the number of rotations of the fixing roller side driving gear is defined as F1, and a second meshing frequency defined by multiplication of the second number of teeth and the number of rotations of the discharging roller side driving gear is defined as F2, the first meshing frequency F1 and the second meshing frequency F2 are set so as to satisfy the following expression (4):
- F1>F2 (4).
10 more elements
Dependencies are inferred from the claim text.