US 2017/0364010 A1Published application

Image forming apparatus

AssigneeCanon Kabushiki Kaisha

InventorsSatoshi Ogawara, Takashi Uehara

Life of this patent

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Abstract

An image forming apparatus includes an image bearing drum; a drum charging member at a charging position opposed to the drum, with a charging bias; a developing member for developing an electrostatic image formed on the drum with toner, with a developing bias; a transfer member for transferring a toner image from the drum onto a sheet, with a transfer bias; a transfer bias source for outputting transfer bias; and a controller for effecting control to start raising of the transfer bias so as to correspond to timing at which an area of the drum passing at a timing of starting of raising of the charging bias passes the transfer position and to complete the raising of the transfer bias so as to correspond to timing at which an area of the drum passing at a timing of completion of raising of the charging bias passes the transfer position.

Claims14

Dependent claims

An image forming apparatus comprising:

an image bearing member;
a charging member configured to charge said image bearing member at a charging position opposed to said image bearing member, by being supplied with a charging bias voltage;
a developing member configured to develop an electrostatic image formed on said image bearing member with toner, by being supplied with a developing bias voltage;
a transfer member configured to transfer a toner image formed on said image bearing member, onto a transfer material, by being supplied with a transfer bias voltage;
a transfer bias voltage source configured to output the transfer bias voltage;
and
a controller configured to effect control to start raising of the transfer bias voltage so as to correspond to a timing at which an area of said image bearing member passing at a timing of starting of raising of the charging bias voltage passes the transfer position and to complete the raising of the transfer bias voltage so as to correspond to a timing at which an area of said image bearing member passing at a timing of completion of raising of the charging bias voltage passes the transfer position.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/623,840Filed 15 Jun 2017
Priority: JP 2016-12023316 Jun 2016
Published: 21 Dec 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

G03G 15/50
Apparatus for electrographic processes using a charge pattern: machine control of apparatus for electrographic processes using a charge pattern,…
G03G 15/0266
For laying down a uniform charge, e.g. for sensitising; Corona discharge devices: arrangements for controlling the amount of charge
G03G 15/1665
Of a toner pattern, e.g. a powder pattern , e.g. magnetic transfer: by introducing the second base in the nip formed by the recording member and…
G03G 15/1675
At least one of the recording member or the transfer member being rotatable during the transfer: with means for controlling the bias applied in…