Fuji Xerox Co., Ltd.

Hitoshi Funato

Fumio Furusawa

Takashi Ohmori

Masami Kurata

Tetsuya Fujita

Nobukazu Takahashi

Ryuji Hattori

Yasutomo Ishii

Hiroyuki Saitoh

Takashi Fuchiwaki

Kazunori Numao

Junichiro Sameshima

Noriyoshi Ishikawa

Haruhiko Takahashi

Yasuo Katou

Toshiharu Inui

Masaaki Tokunaga

Nobuo Hyakutake

Yoshihiro Enomoto

Nobuyoshi Komatsu

Keiji Yamamoto

Satoru Torimaru

Svay Leng

Satoshi Fukada

Kazuhiro Mori

An image forming apparatus includes a fixing unit that heats and fixes a toner image created on a recording medium; and a cooling unit that cools the toner image heated and fixed by the fixing unit with reference to a melting point of wax contained in the toner image from a temperature higher than the melting point to a temperature lower than the melting point.

Image forming apparatus and image forming method

A fixing device includes a primary fixing device disposed in a transporting path for a recording material and a secondary fixing device disposed in the downstream of the primary fixing device The recording material is passed through only the primary fixing device after an image is recorded on an front surface of the recording material Subsequently, an image is recorded on a rear surface of the recording material and the recording material is passed through the primary fixing device and the secondary fixing device The fixing device includes a primary ejection path for ejecting the recording material having passed through the primary fixing device and a secondary ejection path for ejecting the recording material having passed through the primary fixing device and the secondary fixing device in this order.

Image forming apparatus and fixing unit used therefor

An image formation apparatus for document production of reproduction which includes a plurality of paper feed trays T,-T,placed in overlapped relation at multiple stages from top to bottom wherein the length of the top-stage paper feed tray T,in the paper feed direction is formed shorter than the length of each of the paper feed trays T,-T,at lower stages in the paper feed direction, an image support,an intermediate transfer body B, and a secondary transfer device,placed in a tray upward paper feed side space Sa above the paper feed tray T,a fuser T placed in a top-stage tray side space Sb,on the side of the top-stage paper feed tray T,and an upward side space Sb,above the space Sb,and a developing unit D placed in the upward side space Sb

Compact image formation system having a plurality of paper trays

An image formation apparatus for document production or reproduction which includes a plurality of paper feed trays T1-T4 placed in overlapped relation at multiple stages from top to bottom wherein the length of the top-stage paper feed tray T1 in the paper feed direction is formed shorter than the length of each of the paper feed trays T2-T4 at lower stages in the paper feed direction, an image support 16, an intermediate transfer body B, and a secondary transfer device 31 placed in a tray upward paper feed side space Sa above the paper feed tray T1, a fuser T placed in a top-stage tray side space Sb1 on the side of the top-stage paper feed tray T1 and an upward side space Sb2 above the space Sb1, and a developing unit D placed in the upward side space Sb2.

Image formation apparatus for document production or reproduction

An image forming apparatus includes a sheet transport channel including a registration roller for supplying a sheet that is fed from a tray to an image recording section at predetermined timing. A brake forcibly stops rotation of the registration roller. A sensor senses the occurrence of an abnormality in the paper transport channel during transport of the sheet. A controller activates the brake when the sensor has detected the abnormality. Therefore, when a POP jam occurs, sheet rushing into the cleaner due to an overrun can be reliably prevented. Also, in the case of feeding a sheet to prevent a guillotine jam, sheet rushing into the image recording section due to idle rotation of the registration roller can be prevented reliably.

Image forming apparatus enabling easy and reliable recovery from a pop

A sheet S is supported by a movable cylindrical transfer drum 12 and a toner image is transferred from a photosensitive drum 9 onto the sheet S in this state. The sheet S is curved by curl rolls 29, 30 of a conveyer unit 20 so that it is curved outward in harmony with the direction of the transfer drum 12 and that its curvature radius is smaller than that of the transfer drum 12. Then the sheet S is conveyed toward the transfer drum 12. A guide plate 40 is placed between the curl rolls 29, 30 and the transfer drum 12 and the leading end portion of the sheet S conveyed from the curl rolls 29, 30 abuts and slides on the guide face 42 of the guide plate 40. Thus, a moment is given to the following portion of the sheet S held between the curl rolls 29, 30 and the curvature radius of the following portion thereof is corrected so that the curvature radius of the following portion thereof may be increased.

Image forming apparatus having sheet curvature correcting device

A transfer device includes a photosensitive drum on the outer surface of which an image to be transferred is formed; a transfer drum arranged in parallel to the photosensitive drum and substantially in contact with the outer surface of the photosensitive drum, the transfer drum capable of adsorbing a sheet on its outer surface; and a sheet guide for guiding the sheet supplied toward the transfer drum to a transfer position between the photosensitive drum and the transfer drum. At an end of the sheet guide on the side of the transfer position, a hill-shaped guide is provided which flexes at a flexing point in a plane orthogonal to the rotary axis of each of both drums so as to be convex toward the photosensitive drum. The side of the hill-shaped guide from the flexing point toward, and closest to, the transfer position is inclined toward the photosensitive drum with respect to a tangent of the photosensitive drum passing the transfer position.

Transfer device having a copy medium guide

An image recording apparatus includes a paper bending assembly for bending an image recording medium in accordance with the supporting surface of an image transferring drum. A degree of the bending of the image recording medium is set in accordance with the kind of image recording medium by varying the distance between the shafts of the paper bending assembly.

Image recording apparatus with recording medium bending

A paper feeder is suitable for use in an image forming apparatus such as a copier, a printer or the like and is capable of suitably correcting the direction of a sheet of paper conveyed from a registration device to a transfer unit. A paper conveying path is provided in curve form between a resist roller pair and a conveying roller pair provided on the upstream side of the resist roller pair as seen in a paper feeding direction. A fixed guide member is provided on the concave side of the paper conveying path. A movable guide member rotatably supported by a rotatable shaft with the rotatable shaft taken as the center, is provided on the convex side of the paper conveying path. The movable guide member is urged toward the fixed guide member by a torsion spring. A film-shaped elastic member which extends toward the downstream side as seen in the paper conveying direction, is mounted on a leading end portion of the movable guide member. Thus, a force for pressing the leading end portion of the paper against the resist roller pair suitably acts on the paper so that the oblique feeding of the paper is reliably corrected.

Paper feeder

A copying machine records an image on a recording sheet through the use of an ink donor sheet with thermally transferable ink. The copying machine includes a platen of glass for supporting an original to be copied, a scanner unit movable reciprocally relative to the platen for reading a series of lines on the original and for generating an image signal for each line, a thermal head having a heating region for selectively generating thermal pulses in response to the image signal from the scanner unit, an ink donor sheet supply assembly for supplying the thermal head with an ink donor sheet coated with thermally transferable ink which can be fluidized or sublimable upon being heated, a recording sheet supply assembly for supplying a recording sheet in the vicinity of the thermal head, a contacting assembly for bringing the supplied recording sheet into intimate contact with a heating region of the thermal head with the ink donor sheet interposed between the thermal head and the recording sheet, and a recording sheet discharging assembly for discharging the recording sheet peeled off the ink donor sheet after the image has been recorded on the recording sheet.

Copying machine

A two-color copying machine records an image on a recording sheet in two colors such as red and black by using thermally transferable red and black inks on ink donor sheets. The two-color copying machine includes a platen for supporting an original to be copied, a scanner unit movable reciprocally with respect to the platen for reading the original and for generating an image signal for each line which is separated into two single color image signals, each corresponding to one of the two colors, a pair of thermal heads each for selectively generating thermal pulses in response to the image signal from the scanner unit, an ink donor sheet supply assembly for supplying the thermal heads with respective ink donor sheets coated with thermally transferable inks of different colors, respectively, which can be fluidized or sublimated upon being heated, a recording sheet supply assembly for supplying a recording sheet in the vicinity of the thermal heads, a recording sheet contacting assembly for bringing the supplied recording sheet into intimate contact with a heating region of each of the thermal heads with the ink donor sheet interposed between a thermal head and an ink donor sheet, a recording sheet peeling assembly for peeling the recording sheet off the ink donor sheets after the image has been recorded on the recording sheet, and a discharge assembly for discharging the peeled recording sheet.

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Ebina, Japan

Hitoshi Funato