Nitto Kogyo Co., Ltd.

Oriental Yeast Co., Ltd.

Minolta Camera Kabushiki Kaisha

Nippon Kokan Kabushiki Kaisha

Hodaka Kogyo Co., Ltd.

Youichi Ishikawa

Takeshi Kato

Minoru Ohashi

Yuichiro Higashi

Makoto Shouda

Tamon Watabe

Sanji Inagaki

Tetsuya Yamada

Kesaaki Kitazawa

Kazuyoshi Sato

Kiyoshi Koibuchi

Kazuo Fukaya

Kenji Takahashi

Eiichiro Konishi

Junichi Tamaoki

Yasushi Iijima

Naotaka Nishikawa

A fixing apparatus is capable of ensuring the increase of the feeding speed of the recording medium, by effectively accomplishing to preheat the recording medium. In order to accomplish the object, the fixing apparatus (,) have a fixing roller (,), and a pressing roller (,) being rollingly contacted the fixing roller (,) by a predetermined pressure, wherein an unfixed toner image which is carried on a sheet (S) is fixed thereon by passing the sheet (S), on which the toner image is carried, through a nip portion between the fixing roller (,) and the pressing roller (,) along one direction, and further have a heater (,) provided so as to be remote from said fixing roller (,), a heating roller (,) provided so as to be remote from the fixing roller (,), a fixing belt (,) endlessly trained around the heating roller (,) and fixing roller (,), for heating the sheet (S) passing through the nip portion upon receiving the heat from the heater (,), a supporting member (,) fixed on an upstream side of pressing roller (,) with respect to one direction, for supporting the undersurface of the sheet (S) prior to passing through the nip portion, and a heating member (,) for heating the supporting member (,) to preheat the sheet (S) prior to pass through the nip portion.

Fixing apparatus

A toner image fixing apparatus has a fixing roller, a pressing roller, and a heating roller which are rotatable about their own axes. The pressing roller presses a sheet carrying an unfixed toner image against the fixing roller to fix the unfixed toner image to the sheet. The heating roller is disposed on one side of the fixing roller remotely from the pressing roller. An endless heat transfer belt is trained around the heating and fixing rollers for transferring heat from a heater to heat the unfixed toner image on the sheet. A guide plate is positioned upstream of the pressing roller for guiding the sheet to enter between the fixing and pressing rollers. The heat transfer belt and the guide plate are so spaced from each other that the sheet prior to being entering between the fixing and pressing rollers is kept out of contact with the heat transfer belt. The heat transfer belt may be positioned outside of a region where the sheet guided by the guide plate possibly passes. An angle between a line segment interconnecting the centers of the heating and fixing rollers and a reference line interconnecting the centers of the fixing and pressing rollers lies in a range from 105.degree. to 255.degree.. The fixing roller is a resilient roller with an outer resilient layer. The temperatures of the fixing and pressing rollers are kept in a predetermined temperature range in a standby mode.

Toner image fixing apparatus

Disclosed herein is an oil application roll for electrophotograph fixation, which comprises a roll base, an oil holder provided on the roll base, and a porous fluororesin surface layer provided on the oil holder. The porous fluororesin surface layer has a maximum pore diameter of less than 0.1 .mu.m, an air permeability of 500 to 6000 s/100 cc, and a surface roughness of less than Ra 0.5 .mu.m. There is also provided a method of fabricating an oil application roll for electrophotograph fixation, which comprises the steps of (a) providing an oil holder on a roll base, (b) mounting a cylindrical film consisting of porous fluororesin having a thermal shrinkage of more than 30% onto the oil holder to obtain a roll body, and (c) heating the roll body so that the oil holder is covered with the cylindrical film. The cylindrical film consisting of porous fluororesin has a maximum pore diameter of less than 0.1 .mu.m, a void ratio of between 25% and 70%, an air permeability of between 500 s/100 cc and 4000 s/100 cc, and a surface roughness of less than Ra 0.5 .mu.m.

Oil application roll for electrophotograph fixation and method of

A fixing device to be used in electrophotographic apparatus for providing a clear fixed image with no offset with use of no oil or the least amount of oil, wherein an endless fixing belt provided with a metal body having a release thin film thereon is stretched between a fixing roller having a elastic surface and a heating roller, a pressing roller is arranged to press the surface of the elastic fixing roller upwardly from the lower side thereof through the fixing belt to form a nip portion between the fixing belt and the pressing roller, a guide plate for unfixed image carrying support member is provided underneath the fixing belt, between the heating roller and the nip portion, to form substantially a linear heating path between the guide plate and the fixing belt, and the metal body of the fixing belt has a heat capacity per cm.sup.2 within a range of 0.001 to 0.02 cal/.degree.C.

Fixing device for electrophotographic apparatus

The invention provides a method of manufacturing a hydraulic hardening material having the steps of milling vitreous blast furnace slag and classifying the milled slag to provide slag powder having a blaine specific surface area of 6,000 to 12,000 cm.sup.2 /g. The hydraulic hardening material manufactured by the method is used as a Portland blast furance cement raw material.

Hydraulic hardening material and method of manufacturing the same

Disclosed is an oil applying roller provided in contact with the surface of a fixing roller of an electrophotographic copying apparatus. The oil applying roller comprises a core member, an oil retaining layer and a surface layer. The surface layer has less oil retaining ability than that of the oil retaining layer. Thus the oil applying roller can supply a small amount of oil to the fixing roller stably.

Oil applying roller for use in an electrophotographic copying apparatus

An electrical membrane probe for the measurement of dissolved oxygen concentration in fluids, particularly designed for monitoring or control of fermentation process and characterized as follows:

Electrical oxygen probe

An electrical membrane probe for the measurement of dissolved oxygen concentration in fluids, particularly designed for monitoring or control of fermentation process and characterized as follows;

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Tokyo, Japan

Youichi Ishikawa