Fixing device for electrophotographic copying machines
AssigneeMinolta Camera Kabushiki Kaisha
InventorsSoichi Iwao, Shinji Takiguchi, Toshio Sakata
Life of this patent
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Abstract
A fixing device for an electrophotographic copying machine which includes a pair of rollers forming a nip therebetween through which the copy paper passes and an applicator which is capable of feeding a sufficient quantity of offset-preventing liquid only to the portion of the rollers where the leading end of the copy paper, will contact with the supply of offset-printing liquid to the remaining portion of the rollers being minimized to a quantity necessary for the preventing of offset. The consumption of offset-preventing liquid is reduced and the swelling of the silicone rubber coatings on the rollers, when used, is inhibited.
Claims3
A fixing apparatus for use with an electrophotographic copying machine, said fixing apparatus being capable of fixing an unfixed toner image on a copy paper passing therethrough, said fixing apparatus including
- a pair of rotatable fixing rollers which are mounted so as to be capable of being positioned in nip-defining contact, a copy paper having an unfixed toner image on one side being capable of passing therebetween, and
- an applicator means for intermittently applying a predetermined quantity of offset-preventing liquid to one of said fixing rollers, said applicator means including
- an applicator roller in contact with the surface of said one fixing roller,
- a supply tank containing offset-preventing liquid,
- a movable feeding device capable of intermittently supplying offset-preventing liquid from said supply tank to said applicator roller, and
- drive means for moving said feeding device,
- said applicator means supplying offset-preventing liquid to said one of said fixing rollers such that upon rotation of said fixing rollers a large amount of offset-preventing liquid will be located on the roller intended to contact the side of the copy paper having the unfixed toner image at the portion thereof where the leading edge of the copy paper will be positioned so as to facilitate separation therebetween, whereas a lesser amount of offset-preventing liquid will be located on the remaining portion of said roller intended to contact the side of the copy paper having the unfixed toner image thereon.
Dependencies are inferred from the claim text.