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US 9,540,204 B2Granted
Sheet discharge apparatus and image forming apparatus
AssigneeKonica Minolta, Inc.
InventorsTakumi Michibata, Takao Shibazaki, Hideyuki Nukumi
Life of this patent
Estimating the term…
Abstract
A sheet is discharged from between a discharge roller and a feeding roller as pinched between the rotating discharge roller and feeding roller. In this arrangement, a guide is arranged from an upstream side to a downstream side in a sheet discharge direction. The guide is arranged to contact the discharge roller at a downstream position in the discharge direction from a position where the discharge roller contacts the feeding roller.
Claims20
A sheet discharge apparatus comprising:
- a first discharge roller;
- a second discharge roller that is arranged to oppose the first discharge roller, wherein the first discharge roller and the second discharge roller are arranged to pinch a sheet therebetween and to discharge the sheet to a sheet delivery portion by rotation;
- and
- a guide which is arranged from an upstream side to a downstream side in a discharge direction of the sheet and which contacts the first discharge roller at a position that is downstream in the discharge direction from a position where the first discharge roller contacts the second discharge roller;
- wherein the guide is formed of an elastic material, and
- wherein the first discharge roller is arranged in an upper side of the second discharge roller.
3 more elements
An image forming apparatus comprising a sheet discharge apparatus for discharging a sheet with a toner image formed thereon to a sheet delivery portion, wherein the sheet discharge apparatus comprises:
- a first discharge roller;
- a second discharge roller that is arranged to oppose the first discharge roller, wherein the first discharge roller and the second discharge roller are arranged to pinch the sheet therebetween and to discharge the sheet to the sheet delivery portion by rotation;
- and
- a guide which is arranged from an upstream side to a downstream side in a discharge direction of the sheet and which contacts the first discharge roller at a position that is downstream in the discharge direction from a position where the first discharge roller contacts the second discharge roller;
- wherein the guide is formed of an elastic material, and
- wherein the first discharge roller is arranged in an upper side of the second discharge roller.
3 more elements
A sheet discharge apparatus comprising:
- a first discharge roller;
- a second discharge roller that is arranged to oppose the first discharge roller, wherein the first discharge roller and the second discharge roller are arranged to pinch a sheet therebetween and to discharge the sheet to a sheet delivery portion by rotation;
- and
- a guide which is arranged from an upstream side to a downstream side in a discharge direction of the sheet and which contacts the first discharge roller at a position that is downstream in the discharge direction from a position where the first discharge roller contacts the second discharge roller;
- wherein the first discharge roller and the second discharge roller are vertically arranged one above the other to allow the second discharge roller to contact a lower side of the first discharge roller, and the guide is arranged to contact the first discharge roller at the position that is downstream in the discharge direction from the position where the second discharge roller contacts the first discharge roller;
- and
- wherein a horizontal distance ‘b’ between a position of a shaft center of the second discharge roller and the contact position between the guide and the first discharge roller satisfies a condition:
- b>r−v·(2a/g)1/2,
- where
- ‘r’ denotes a radius of the second discharge roller;
- ‘a’ denotes a vertical distance between the position of the shaft center of the second discharge roller and the contact position between the guide and the first discharge roller;
- ‘v’ denotes a velocity at which the first discharge roller discharges the sheet;
- and
- ‘g’ denotes acceleration due to gravity.
11 more elements
An image forming apparatus comprising a sheet discharge apparatus for discharging a sheet with a toner image formed thereon to a sheet delivery portion, wherein the sheet discharge apparatus comprises:
- a first discharge roller;
- a second discharge roller that is arranged to oppose the first discharge roller, wherein the first discharge roller and the second discharge roller are arranged to pinch the sheet therebetween and to discharge the sheet to the sheet delivery portion by rotation;
- and
- a guide which is arranged from an upstream side to a downstream side in a discharge direction of the sheet and which contacts the first discharge roller at a position that is downstream in the discharge direction from a position where the first discharge roller contacts the second discharge roller;
- wherein the first discharge roller and the second discharge roller are vertically arranged one above the other to allow the second discharge roller to contact a lower side of the first discharge roller, and the guide is arranged to contact the first discharge roller at the position that is downstream in the discharge direction from the position where the second discharge roller contacts the first discharge roller, and
- wherein a horizontal distance ‘b’ between a position of a shaft center of the second discharge roller and the contact position between the guide and the first discharge roller satisfies a condition:
- b>r−v/·(2a/g)1/2,
- where
- ‘r’ denotes a radius of the second discharge roller;
- ‘a’ denotes a vertical distance between the position of the shaft center of the second discharge roller and the contact position between the guide and the first discharge roller;
- ‘v’ denotes a velocity at which the first discharge roller discharges the sheet;
- and
- ‘g’ denotes acceleration due to gravity.
10 more elements
Dependencies are inferred from the claim text.