Brother Kogyo Kabushiki-kaisha

Mitsukiyo Okamura

Masataka Maeda

Takanori Uno

Tomoaki Hattori

Kenjiro Nishiwaki

Tomoaki Hazeyama

Yasuhiro Maruyama

Keisuke Takahashi

Suzue Onoda

A developer supply device is provided, which includes a casing including a developer storage section at a bottom portion therein and an opening formed at an end thereof away from the developer storage section, development agent chargeable with a predetermined polarity, stored in the developer storage section, and a transfer board that is disposed in the casing and configured to transfer the development agent stored in the developer storage section when a multi-phase alternating-current voltage is applied to transfer electrodes of the transfer board. The development agent includes a mother particle having, around an outer surface thereof, an electrically insulating layer without a polar group having a charge polarity identical to the predetermined polarity, and an external additive, absorbed to around the mother particle in an easily desorbable manner, which is an electrically insulating fine particle having a charge polarity identical to the predetermined polarity.

Developer supply device and image forming apparatus having the same

A developer supply device is provided, which includes a developer retrieving board disposed in closest proximity to a developer holding surface parallel to a first direction, across a predetermined distance in a retrieving proximity position that is downstream relative to a first position where a developer holding surface faces an intended device to be supplied with development agent and upstream relative to a second position that is upstream relative to the first position and a position where the development agent is transferred onto the developer holding surface, in a second direction as a moving direction of the developer holding surface which direction is perpendicular to the first direction. The developer retrieving board retrieves the development agent from the developer holding surface in a position downstream relative to the retrieving proximity position in a developer transfer direction along a developer retrieving path perpendicular to the first direction.

Developer supply device, developer retrieving device for the same, and image forming apparatus having the same

A developer supply apparatus is provided which supplies a toner to a supply object, the developer supply apparatus including a developer storage body which stores a powdery developer, and a transfer body which transfers the developer along the developer transfer path with traveling wave electric fields. The developer includes a toner having a predetermined charging characteristic and an electric neutralizer having an opposite charging characteristic, which is opposite to the predetermined charging characteristic.

Developer supply apparatus and image forming apparatus

A developer supply device, including a developer holding body having a cylindrical developer holding surface so that the developer holding surface moves in a direction perpendicular to the main scanning direction and a developer held on the developer holding surface is carried to a developer supply position; a developer amount limiting member that limits an amount of the developer held on the developer holding surface by contacting the developer holding surface on an upstream side in a moving direction of the developer holding surface with respect to the developer supply position; and a carrying substrate that carries the developer to the developer holding body through a traveling electric field, wherein the carrying substrate faces the developer holding surface at a developer holding position, and wherein a position to which the developer scraped off the developer holding surface falls is different from the developer holding position.

Developer supply device

A developer supply device, comprising: a developer holding body having a circumferential surface and a rotation axis extending in a main scanning direction and being placed to face a supply target at a developer supply position; a carrying substrate that has a plurality of electrodes arranged along a direction intersecting with the main scanning direction and that carries a developer in a developer transport direction through a traveling electric field generated by application of a multiphase alternating voltage to the plurality of electrodes, the carrying substrate being located such that an end of the carrying substrate in the developer transport direction is positioned to face the developer holding body; and a voltage application unit configured to apply, to the plurality of electrodes and the developer holding body, the multiphase alternating voltage having alternating components synchronizing with each other.

Growing community of inventors

Aichi, Japan

Mitsukiyo Okamura