US 2013/0270764 A1Published application

Sheet conveying device, sheet feed device and image forming apparatus having the same

AssigneeKYOCERA Documentation Solutions Inc.

InventorMasahiko Mizuno

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Abstract

A sheet sender 21A includes a lift plate 21P, a feed roller 21B and a registration roller 23. A biasing spring 21S applies an upward force onto the lift plate 21P. The lift plate 21P is moved upward by eccentric cams 60 which are arranged at axial ends of the feed roller 21B and rotationally driven by arm protrusions 211 which have come in contact with the eccentric cams 60. A rotational driving force is transmitted to a feed gear 220 and a registration gear 231 from a main gear 70 to rotate the feed roller 21B and the registration roller 23. A gear of the main gear 70 that engages with the feed gear 220 is idly rotatable within a predetermined angle with respect to a gear that engages with the registration roller 23.

Claims15

Dependent claims

A sheet conveying device comprising:

a lift plate onto which a sheet of recording medium is placed;
a sheet conveying path configured to convey the sheet of recording medium placed on the lift plate in a predetermined sheet conveying direction;
a slope part attached to the lift plate and configured to slope downward in the sheet conveying direction;
a biasing member configured to apply a force to the lift plate to cause a leading edge of the sheet of recording medium in the sheet conveying direction to move upward;
a feed roller, which is arranged to be contactable with the leading edge of the sheet of recording medium, configured to be rotationally driven to feed the sheet of recording medium in the sheet conveying direction;
a conveyance roller, which is arranged downstream of the feed roller in the sheet conveying direction, configured to be rotationally driven to convey the sheet of recording medium fed out by the feed roller;
a rotation shaft, which extends in a sheet width direction perpendicular to the sheet conveying direction, configured to rotatably support the feed roller;
a cam member, which is arranged at the rotation shaft to be rotatable in unison with the rotation shaft, configured to be contactable with the slope part;
a driving unit configured to generate a rotational driving force to cause the feed roller and the conveyance roller to rotate;
and
a gear train configured to be connected to the driving unit such that the gear train is rotationally driven;
wherein
the gear train comprises:
a first transmission part configured to transmit the rotational driving force to one of the conveyance roller and the rotation shaft;
a second transmission part, which is arranged coaxial with the first transmission part, configured to be relatively rotatable with respect to the first transmission part and to transmit the rotational driving force to the other one of the conveyance roller and the rotation shaft;
and
a restriction member configured to allow a predetermined amount of relative rotation of the second transmission part with respect to the first transmission part and to subsequently restrict the relative rotation.

14 more elements

A feed device comprising:

a sheet conveying device;
and
a sheet container which accommodates a sheet of recording medium;
wherein
the sheet conveying device includes:
a lift plate onto which the sheet of recording medium is placed;
a sheet conveying path for conveying the sheet of recording medium on the lift plate into a predetermined sheet conveying direction;
a slope part which is attached to the lift plate and inclined downward toward the sheet conveying direction;
a biasing member which applies force to the lift plate so as to move a leading edge of the sheet of recording medium upward in the sheet conveying direction;
a feed roller which is arranged to be able to contact the leading edge of the sheet of recording medium, is rotary-driven, and sends out the sheet of recording medium into the sheet conveying direction;
a conveyance roller which is arranged downstream of the feed roller in the sheet conveying direction and conveys the sheet of recording medium sent out by the feed roller;
a rotation shaft which extends in a sheet width direction that is perpendicular to the sheet conveying direction and supports the feed roller rotatably;
a cam member which is arranged on the rotation shaft to be able to rotate together with the rotation shaft and can contact the slope part;
a driving unit which generates rotational driving force which rotates the feed roller and the conveyance roller;
and
a gear train which is connected to the driving unit to be rotary-driven;
wherein
the gear train includes:
a first transmission part which transmits the rotational driving force to either one of the conveyance roller and the rotation shaft;
a second transmission part which is arranged coaxial with the first transmission part, is relatively rotatable with respect to the first transmission part, and transmits the rotational driving force to the other one of the conveyance roller and the rotation shaft;
a restriction member which regulates relative rotation of the second transmission part with respect to the first transmission part after allowing a predetermined amount of the relative rotation;
and
the lift plate is arranged in the sheet container.

20 more elements

An image forming apparatus comprising:

a sheet conveying device;
a sheet container which accommodates a sheet of recording medium;
and
an image forming unit which forms an image onto the sheet of recording medium;
wherein
the sheet conveying device includes:
a lift plate onto which the sheet of recording medium is placed;
a sheet conveying path for conveying the sheet of recording medium on the lift plate into a predetermined sheet conveying direction;
a slope part which is attached to the lift plate and inclined downward toward the sheet conveying direction;
a biasing member which applies force to the lift plate so as to move a leading edge of the sheet of recording medium upward in the sheet conveying direction;
a feed roller which is arranged to be able to contact the leading edge of the sheet of recording medium, is rotary-driven, and sends out the sheet of recording medium into the sheet conveying direction;
a conveyance roller which is arranged downstream of the feed roller in the sheet conveying direction and conveys the sheet of recording medium sent out by the feed roller;
a rotation shaft which extends in a sheet width direction that is perpendicular to the sheet conveying direction and supports the feed roller rotatably;
a cam member which is arranged on the rotation shaft to be able to rotate together with the rotation shaft and can contact the slope part;
a driving unit which generates rotational driving force which rotates the feed roller and the conveyance roller;
and
a gear train which is connected to the driving unit to be rotary-driven;
wherein
the gear train includes:
a first transmission part which transmits the rotational driving force to either one of the conveyance roller and the rotation shaft;
a second transmission part which is arranged coaxial with the first transmission part, is relatively rotatable with respect to the first transmission part, and transmits the rotational driving force to the other one of the conveyance roller and the rotation shaft;
and
a restriction member which regulates relative rotation of the second transmission part with respect to the first transmission part after allowing a predetermined amount of the relative rotation, and
the lift plate is arranged in the sheet container.

21 more elements

Dependencies are inferred from the claim text.

Facts

Application: 13/861,199Filed 11 Apr 2013
Priority: JP 2012-09199913 Apr 2012
Published: 17 Oct 2013
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

B65H 5/06
Feeding articles separated from piles; Feeding articles to machines: by rollers or balls, e.g. between rollers
G03G 15/6511
Supplying of sheet copy material; Cassettes therefor: feeding devices for picking up or separation of copy sheets
G03G 21/1647
For connecting the different parts of the apparatus: mechanical connection means
B65H
Handling thin or filamentary material

Family

US 8,733,754 B2Related patent
US 2013/0270764 A1This patent

From the US filing history. Foreign family members aren’t listed.

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