US 10,649,358 B2Granted

Image forming apparatus

AssigneeOki Data Corporation

InventorTakaaki Ebe

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Abstract

An image forming apparatus includes a toner image supporting section and a medium transfer section. The toner image supporting section includes first and second toner image supporting member that support first and second toner images at first and second linear speeds, respectively. The medium transfer section transfers, onto a medium, the first and second toner images respectively supported by the first and second toner image supporting members, to thereby cause the first and second toner images to be superimposed on each other. The following conditional expression (1) is satisfied when the medium transfer section transfers the first and second toner images onto the medium, (Vd1−Vt1)/(Vt1>(Vd2−Vt2)/Vt2 (1) where Vd1 is the first linear speed, Vt1 is a first conveyance speed of the medium, Vd2 is the second linear speed, and Vt2 is a second conveyance speed of the medium.

Claims14

Dependent claims

An image forming apparatus

comprising:
a toner image supporting section that includes a first toner image supporting member and a second toner image supporting member, the first toner image supporting member supporting a first toner image at a first linear speed, the second toner image supporting member supporting a second toner image at a second linear speed;
and
a medium transfer section that transfers, onto a medium, the first toner image supported by the first toner image supporting member and the second toner image supported by the second toner image supporting member,
or comprising:
a toner image supporting section that includes a toner image supporting member, the toner image supporting member supporting a first toner image at a first linear speed, and supporting a second toner image at a second linear speed;
and
a medium transfer section that transfers, onto a medium, the first toner image and the second toner image both supported by the toner image supporting section,
wherein
the medium transfer section transfers the first toner image and the second toner image onto the medium to thereby cause the first toner image and the second toner image to be superimposed on each other, and
the following conditional expression (1) is satisfied when the medium transfer section transfers the first toner image and the second toner image onto the medium to thereby cause the first toner image and the second toner image to be superimposed on each other,
(Vd1−Vt1)/Vt1>(Vd2−Vt2)/Vt2 (1)
where Vd1 is the first linear speed,
Vt1 is a first conveyance speed of the medium at time when the first toner image is transferred,
Vd2 is the second linear speed, and
Vt2 is a second conveyance speed of the medium at time when the second toner image is transferred.

13 more elements

An image forming apparatus comprising:

a toner image supporting section that performs a first image forming operation and a second image forming operation, the first image forming operation forming a first toner image at a first linear speed, the first toner image being one of a first transparent image and a white image, the second image forming operation sequentially forming a second toner image and a third toner image each at a second linear speed, after the first image forming operation, the second toner image being a second transparent image, the third toner image being a colored image;
and
a medium transfer section that performs a first transfer operation and a second transfer operation, the first transfer operation transferring the first toner image onto a medium conveyed at a first conveyance speed before the second image forming operation, the second transfer operation transferring the third toner image and the second toner image to thereby cause the third toner image and the second toner image to be stacked in order on the first toner image transferred onto the medium conveyed at a second conveyance speed, wherein
the following conditional expression (1) and the following conditional expression (2) are satisfied,
(Vd1−Vt1)/Vt1>(Vd2−Vt2)/Vt2 (1)
Vd1>Vt1 (2)
where Vd1 is the first linear speed,
Vt1 is the first conveyance speed,
Vd2 is the second linear speed, and
Vt2 is the second conveyance speed.

7 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/903,013Filed 22 Feb 2018
Priority: JP 2017-03542327 Feb 2017
Published: US 2018/0246435 A130 Aug 2018
Granted: 12 May 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

G03G 13/16
Transferring a pattern to a second base: of a toner pattern, e.g. a powder pattern
G03G 13/01
Electrographic processes using a charge pattern: for multicoloured copies
G03G 13/20
Electrographic processes using a charge pattern: fixing, e.g. by using heat
G03G 15/1615
Using at least one intermediate support: relating to the driving mechanism for the intermediate support, e.g. gears, couplings, belt tensioning