Minolta Camera Kabushiki Kaisha

Minolta Company, Ltd.

Hiroshi Fukao

Ichiro Demizu

Yoshihiro Mikuriya

Yoshikazu Nishihara

Mitsutoshi Nakamura

Mineyuki Sako

Shinobu Nakasawa

Fumiko Nakazawa

Hiroyuki Fukuda

Kuniya Matsuura

Sanji Inagaki

Yoshihiro Hattori

Kenzo Toya

Yuji Shintani

Tetsuya Yamada

Shingo Hirota

Kazuhiro Sakamoto

Etsuaki Urano

Hiroshi Sakakibara

Keiji Asakawa

Toshikazu Muramatsu

Fumiko Hirano

A toner is provided for electrostatic latent image developing which exhibits desirable smearing, offset and filming characteristics during copying, and which has excellent toner flow characteristics and chargeability properties. The toner of the present invention contains at least a binder resin containing polyethylene wax, and at least polypropylene wax, and colorant. The toner of the present invention is made by a process whereby polyethylene wax is added to a binder resin to form a mixture. The mixture is then added or mixed with a colorant and polypropylene wax.

Toner for electrostatic latent image developing

An image forming apparatus, such as a printer or photocopier, has a cleaning device for cleaning an image carrier. The efficiency with which the cleaning device cleans the image carrier is varied in dependence upon the image forming conditions, to thereby reduce wear on both the cleaning device and the image carrier. In one embodiment, cleaning efficiency is varied by changing the contact pressure between a cleaning blade and the image carrier. In a color apparatus with multiple image-forming units, the image forming conditions relate to whether the image to be formed is monochrome, composite color or simul-color.

Image forming apparatus with variable efficiency cleaning mechanism

An image forming apparatus includes a movable recording medium bearing member, an image forming device for forming an image on the image bearing member with a developer having an additive and a cleaning device having a cleaning member which makes a contact with the image bearing member for cleaning thereof at a cleaning station. The apparatus further includes a transferring device for transferring the image from the image bearing member to a recording medium. A processing device is mounted between the transfer station and the cleaning station for processing the additive that has not been transferred but still remains on the image bearing member such that one component of the additive remains on the image bearing member and another component of the additive is removed.

Image forming apparatus having a device for removing charged materials

The present invention relates to toners for developing electrostatically charged images which contains polyethylene fine particles and polypropylene fine particles as wax, which have a specific particle size. By incorporating such polyethylene and polypropylene fine particles into toners the prevention of smear, offset, filming, and improvement of fluidity and chargeability of the toners can be achieved.

Toners for developing electrostatically charged images

A toner for two-component developing agent is provided which can prevent smearing and offsetting during copying operation, and which is not liable to fluidity decrease and chargeability deterioration. The toner contains polyethylene and polypropylene as toner waxes and incorporates a magnetic powder having a certain BET specific surface area.

Toner for two-component developing agent

The present invention relates to a toner for developing electrostatic latent images which has silica and titania or alumina on the toner surface at specified ratio or in specified states, so that environmental stability in chargeability and stable copy images with fine texture can be obtained.

Toner for developing electrostatic latent images

The present invention relates to a toner for developing electrostatic latent images, comprising titanium oxide or aluminum oxide having two peak values within the range between 10 and 20 m.mu.m and between 30 and 60 m.mu.m in primary particle size.

Toner for developing electrostatic latent image

This invention relates to a developing method for electrostatic latent images for developing the electrostatic latent images retained on an electrostatic latent image retaining member, comprising

Developing method of electrostatic latent images for full color image

An image forming apparatus provided with a transport device for discharging waste toner remained on a holding member of electrostatic latent image in an image forming section after transporting the toner onto a cleaning web arranged for cleaning fixing rollers of a fixing device. The waste toner transported and discharged by the transport device is absorbed into a wide area of the cleaning web and rolled therein since used portion of the cleaning web is rolled up. The transport device includes a mechanism for dispersing the discharged waste toner onto the cleaning web thereby collecting the waste toner in a wide area of the cleaning web.

Image forming apparatus

A heat fixing unit in an electrophotographic copying apparatus is disclosed. The heat fixing unit comprises a heat fixing roller with a heater, a pressure roller with a plurality of fibers, and driven ring components disposed on the ends of the pressure roller for adjusting the contact amount between the heat fixing roller and the pressure roller. The heat fixing unit offers a less warming up time and a better paper delivery performance, and requires less material cost. The heat fixing unit in an electrophotographic copying apparatus may employ a fixed type or a rotary type curing unit for raising the plurality of fibers.

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Toyokawa, Japan

Hiroshi Fukao