US 10,520,870 B2Granted

Image forming apparatus with reduced long period gap variation

AssigneeRicoh Company, Ltd.

InventorsHiroaki Takagi, Kimiharu Yamazaki, Naoyuki Suido

Life of this patent

Estimating the term…

Loading patent…

Abstract

An image forming apparatus includes a drive device including a first drive transmission passage through which a driving force of a drive source is transmitted to a developer bearer via a first joint and a second drive transmission passage through which the driving force is transmitted to a rotary body via a second joint. The first drive transmission passage and the second drive transmission passage are defined such that one of a first drive transmission ratio to the first joint of the first drive transmission passage and a second drive transmission ratio to the second joint of the second drive transmission passage is an integral multiple of the other of the first drive transmission ratio from the drive source to the first joint of the first drive transmission passage and the second drive transmission ratio from the drive source to the second joint of the second drive transmission passage.

Claims11

Dependent claims

An image forming apparatus comprising:

a drive source configured to generate a driving force;
a first rotary body supported by a support member and configured to receive the driving force applied by the drive source and transmitted via a first joint having a first detachable engaging member and a first detachable engaged member;
a second rotary body supported by the support member sharing with the first rotary body and configured to receive the driving force applied by the drive source and transmitted via a second joint having a second detachable engaging member and a second detachable engaged member, wherein a ratio of a number of rotations of the first joint and a number of rotations of the second joint being an integer thereof;
a charging device configured to charge a surface of an image bearer;
a latent image writing device configured to optically write a latent image to the surface of the image bearer charged by the charging device;
a rotation attitude detector configured to detect a rotation attitude of the first rotary body;
and
a periodic variation device configured to vary, based on detection result of the rotation attitude detector, at least one of a charging intensity generated by the charging device, a developing bias to be applied to the first rotary body, and a latent image writing intensity generated by the latent image writing device at a rotation period of the first rotary body.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/616,822Filed 7 Jun 2017
Priority: JP 2016-1143748 Jun 2016
Published: US 2017/0357200 A114 Dec 2017
Granted: 31 Dec 2019
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G03G 15/5008
Machine control of apparatus for electrographic processes using a charge pattern, e.g. regulating differents parts of the machine, multimode…:…
G03G 15/0275
For laying down a uniform charge, e.g. for sensitising; Corona discharge devices: arrangements for controlling the area of the photoconductor to…
G03G 15/065
For developing: arrangements for controlling the potential of the developing electrode
G03G 21/1857
Means for handling the process cartridge in the apparatus body: for transmitting mechanical drive power to the process cartridge, drive…