Sheet feeding device with guide member

• US 8,109,501 B2
• Filed: 03/24/2009
• Issued: 02/07/2012
• Est. Priority Date: 03/27/2008
• Status: Active Grant

• Current Assignee: Konica Minolta Business Technologies Incorporated (Konica Minolta Inc.)
• Original Assignee: Konica Minolta Business Technologies Incorporated (Konica Minolta Inc.)
• Inventors: Suzuki, Tomoo
• Primary Examiner(s): Severson, Jeremy R
• Application Number:
  US12/409,750
• Publication Number:
  US 20090243191A1
• Time in Patent Office: 1,050 Days
• Field of Search: 271/121, 271/122, 271/124, 271/125, 271/161
• US Class Current: 271/121
• CPC Class Codes: B65H 2301/51256 Removing waviness or curl, smoothing
• CPC Class Codes: B65H 3/5261 Retainers of the roller type, e.g. rollers
• CPC Class Codes: B65H 3/68 immovable in operation

Abstract

As a guide member provided on a conveyance path through which a sheet is conveyed toward a separation device, a guide member having a sloping guide surface is used, and the aforesaid guide member is arranged so that an uppermost stream point of the sloping guide surface may be positioned at the upstream side of a separation point of the aforesaid separation device and a lowermost stream point of the aforesaid guide surface may be positioned at the downstream side of the aforesaid separation point.

Claims

1. A sheet feeding device, comprising:

a pickup device which feeds a sheet by rotating while the pickup device comes in contact with a sheet located at an outermost position of a loaded stack of sheets; and

a separation device which separates the sheet fed by the pickup device from another sheet and conveys the sheet;

the separation device comprising;

a conveying device for conveying the sheet in a conveyance direction; and

a removing device for providing conveyance resistance on a lower surface of the sheet, the sheet feeding device further comprising,

a guide member for guiding the sheet from a point upstream of the separation device to a point downstream of the separation device in the conveyance direction,

wherein the guide member comprises a sloping guide surface which is a slope inclined with respect to a conveyance surface of the sheet in the conveyance direction of the sheet so as to form a conveyance gap which is wider on an upstream side and narrower on a downstream side in the conveyance direction,

wherein the guide member extends toward both sides from a center in a width direction perpendicular to the conveyance direction,

wherein, at an end portion of the sloping guide surface in the width direction, the sloping guide surface is formed so that an uppermost stream point of the slope is positioned on an upstream side of a separation point which is formed by the conveying device and the removing device in the conveyance direction and a lowermost stream point of the slope is positioned on a downstream side of the separation point in the conveyance direction, and

wherein, at the center in the width direction, the sloping guide surface is formed so that both an uppermost stream point and a lowermost stream point of the slope are positioned on the upstream side of the separation point.

2. The sheet feeding device of claim 1, further comprising,

an opposing guide member which is positioned on an opposite side of a sheet conveyance path from the guide member to face the guide member and has a guide surface which is a slope so as to form a conveyance gap which is wider on an upstream side and narrower on a downstream side in the conveyance direction on the upstream side of the separation point.

3. The sheet feeding device of claim 1,

wherein the guide member has a parallel guide surface parallel to a the conveyance surface on an upstream side of the sloping guide surface in the conveyance direction.

4. The sheet feeding device of claim 1,

wherein, at the end portion, the guide member has a parallel guide surface parallel to a the conveyance surface on an upstream side of the sloping guide surface in the conveyance direction.

5. An image forming apparatus provided with the sheet feeding device of claim 1.

6. The sheet feeding device of claim 1,

wherein the slope of the sloping guide surface is formed so that an upstream side of the sloping guide surface is higher than a downstream side of the sloping guide surface with respect to the conveyance surface.

7. The sheet feeding device of claim 1,

wherein the sloping guide surface extends toward the end portion from the center in the width direction.

8. The sheet feeding device of claim 7,

wherein the sloping guide surface extends so that the end portion of the sloping guide surface is located in a downstream side of the center of the sloping guide surface.

9. The sheet feeding device of claim 1,

wherein an end part of downstream side of the guide member in the conveyance direction is inclined from the width direction perpendicular to the conveyance direction.

10. The sheet feeding device of claim 9,

wherein the end part of downstream side of the guide member in the conveyance direction is inclined so that the end part of the guide member at the end portion is located in a downstream side of the end part of the guide member at the center.