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41. 发明专利

JP2000231296A FIXING DEVICE AND IMAGE FORMING DEVICE PROVIDED WITH THE SAME 失效
公开(公告)号：JP2000231296A
公开(公告)日：2000-08-22
申请号：JP3193199
申请日：1999-02-09
申请人： CANON KK
发明人： INOUE KEISUKE , ISHIZUKA JIRO , OTA MITSUHIRO
IPC分类号： G03G15/20
摘要： PROBLEM TO BE SOLVED: To prevent a recording material from wrinkling at the fixing time. SOLUTION: In this fixing device, a toner image is fixed while holding/ carrying the recording material S by a fixing nip part N between a fixing roller 31 and a pressure roller 32. At this time, a pulling-back force applied from the pressure roller 32 is imparted to the rear side of the recording material S. This force is liable to become smaller at the center part, and larger at the end parts. The device is allowed to impregnate oil in only end parts A and A of the cleaning web 35a held in contact with the pressure roller 32 over whole length in the lengthwise direction, excluding the center part B. In such a manner, the coefficient of friction (μ) at end parts on the pressure roller 32 surface are reduced, the back turning force allied from the pressure roller 32 to the recording material S are equalized, therefore the wrinkles are prevented from the occurrence.

42. 发明专利

JP2000137406A FIXING DEVICE AND IMAGE FORMING DEVICE 失效
公开(公告)号：JP2000137406A
公开(公告)日：2000-05-16
申请号：JP30918598
申请日：1998-10-29
申请人： CANON KK
发明人： INOUE KEISUKE , ISHIZUKA JIRO , OTA MITSUHIRO
IPC分类号： G03G15/20
摘要： PROBLEM TO BE SOLVED: To prevent transfer material carrying a unfixed toner image thereon transferred by being inserted in a nip part between a fixing roller and the pressure roller from the generation of wrinkles. SOLUTION: This fixing device is made possible to prevent the transfer material S transported by being inserted in the nip part N between the fixing roller 11 and the pressure roller 12 from the generation of wrinkles by letting the pressure roller 12, rotated so as to be quicker than rotary speed of the fixing roller 11 being rotary driven by driving means, when the unfixed toner image is fixed on both sides of the transfer material S, and letting silicone oil impregnated in a section corresponding to a center part of the pressure roller 12 of the web 17a for cleaning held in contact with a surface of the pressure roller 12, and moreover making the coefficient of friction between the pressure roller 12 and the transfer material S on the center part with regard to the center part in the length direction of the pressure roller 12 lower than both end parts thereof.

43. 发明专利

JP2000131993A FIXING DEVICE AND IMAGE FORMING DEVICE 失效
公开(公告)号：JP2000131993A
公开(公告)日：2000-05-12
申请号：JP30596398
申请日：1998-10-27
申请人： CANON KK
发明人： INOUE KEISUKE , ISHIZUKA JIRO , OTA MITSUHIRO
IPC分类号： G03G15/20
摘要： PROBLEM TO BE SOLVED: To prevent the occurrence of wrinkles on transfer material on which an unfixed toner image is transferred and which is held and carried by a nip part between a fixing roller and a pressure roller. SOLUTION: By optionally setting the number of teeth of gears 21 to 25 connected between the fixing roller and the pressure roller and rotating the follower pressure roller at a rotational speed higher than that of the fixing roller which is rotary-driven by a driving means, the occurrence of the wrinkles on the transfer material held and carried by the nip part between the fixing roller and the pressure roller is prevented.

44. 发明专利

JP2000056616A IMAGE FORMING DEVICE 失效
公开(公告)号：JP2000056616A
公开(公告)日：2000-02-25
申请号：JP23495298
申请日：1998-08-06
申请人： CANON KK
发明人： SAITO RIE , OTA MITSUHIRO , ISHIZUKA JIRO
IPC分类号： G03G21/14 , G03G15/00 , G03G15/20 , G03G21/00
摘要： PROBLEM TO BE SOLVED: To prevent a rotating body from being damaged and to secure safety by making the amount of an unfixed image transferred from recording material to the rotating body equal to the transfer amount of the unfixed image in the midst of ordinary image forming when a recording material existence detection means detects the recording material after the interruption of image forming operation. SOLUTION: In the case of stopping copying operation by detecting any abnormality in a device main body in the midst of copying operation, the existence of the recording material is detected by a sensor S detecting the existence of the recording material near a fixing roller 51. When the recording material existence sensor S detects that the recording material is in the vicinity of the roller 51, power sources for the halogen heater 56 of the roller 51 and the halogen heater 57 of a pressure roller 52 are not turned off but the temperature of both heaters 56 and 57 is controlled in the vicinity of the softening point of toner. Then, the toner exists on the recording material or near the roller 51 in a softened state, and the toner is melted in the same state as the ordinary fixed state and is not offset to the roller 51, so that releasing property is kept excellent.

45. 发明专利

JPH10340025A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH10340025A
公开(公告)日：1998-12-22
申请号：JP16211897
申请日：1997-06-05
申请人： CANON KK
发明人： MENJO TAKESHI , OTA MITSUHIRO
IPC分类号： G03G15/01 , G03G15/20
摘要： PROBLEM TO BE SOLVED: To provide a high-quality color copy image to a user by simultaneously forming the respective copy images in accordance with plural pieces of image information on the same surface of a transfer material with even image glossiness. SOLUTION: A control part is set so that the circumferential speed of a pressure roller 102 is changed whenever each copy image is fixed to a recording paper P through a driving mechanism M1 in the case of multiple copy by color toner. The control part sets the circumferential speed of the roller 102 whenever the copy image is fixed on the same surface of the paper P through the mechanism M1 based on the manual operation of an operating part by an operator so that the respective copy images in accordance with the plural pieces of image information can be fixed on the same surface of the paper P with the even image glossiness. Consequently, heat supply amount to the paper P from a fixing device 100 can be controlled whenever the respective copy images are fixed on the same surface of the paper P, so that the image glossiness of the respective copy images can be nearly uniformly kept.

46. 发明专利

JPH10161372A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH10161372A
公开(公告)日：1998-06-19
申请号：JP33500796
申请日：1996-11-29
申请人： CANON KK
发明人： MENJO TAKESHI , OTA MITSUHIRO
IPC分类号： B41J29/46 , B41J2/44 , B41J2/525 , G03G15/00 , G03G15/01 , G03G15/20
摘要： PROBLEM TO BE SOLVED: To ensure stable, high hansmissibility of an image formed on an OHP sheet. SOLUTION: A yellow solid image as a reference image is formed on the OHP sheet, it is projected by a projector 41, and the transmission density of the solid image is detected by a reader R. In case the transmission density is high, that is, transmissibility is poor, the fixing temperature of a heat-roller fixing device 9 is increased, and, thus, the image on the OHP sheet can have stable transmissibility.

47. 发明专利

JPH09305058A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH09305058A
公开(公告)日：1997-11-28
申请号：JP11680096
申请日：1996-05-10
申请人： CANON KK
发明人： MENJO TAKESHI , OTA MITSUHIRO
IPC分类号： G03G15/00 , G03G15/01 , G03G15/20 , G03G21/00
摘要： PROBLEM TO BE SOLVED: To control an image gloss, which occurs due to differences in fixingmember durability and recording-medium material, by variably setting the heating temperature of a heating/fixing device based on a reference image read by an image reading means. SOLUTION: The final temperatures of a fixing roller 51 and a pressure roller 52 are set to, for example, 170 deg.C. The fixing roller 51 and the pressure roller 52 are heated by heaters 56 and 57, respectively, and when they reach 150 deg.C, a so-called black image (reference image) in which images outputted at Y, M, C, and K solid densities are superimposed is outputted. In the image forming device for obtaining a digital color image, the black image is outputted by comparing it with a pattern generator image incorporated in it. In the same manner, also when the fixing roller 51 and pressure roller 52 are heated by the heaters 56 and 57 and reach 160 deg.C and 170 deg.C, a reference image is outputted. Thus, an optimum gloss is obtained from the data on the density of the reference image outputted at the corresponding temperature.

48. 发明专利

JPH0990800A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH0990800A
公开(公告)日：1997-04-04
申请号：JP24337995
申请日：1995-09-21
申请人： CANON KK
发明人： OTA MITSUHIRO , MENJO TAKESHI , KUMAGAI HIROAKI , KAWAMOTO HIDEO , KISHINO KAZUO
IPC分类号： G03G15/20 , G03G21/10
摘要： PROBLEM TO BE SOLVED: To provide excellent durability and image stability by containing a metal ionic compound of a metal selected from the group consisting of transition metal, aluminium and gallium in an application oil to be supplied to a fixing roller. SOLUTION: This device has a fixing device 18 for carrying a recording material P between a fixing roller 29 and a pressure roller 30 followed by fixing and an oil applying device 50 for supplying a coating oil 41 to the fixing device 18. The fixing roller 29 has a high temperature vulcanized silicone rubber layer 32 and a room temperature vulcanized silicone rubber layer 33 on a core metal 31, and the pressure roller 30 has a high temperature vulcanized silicone rubber on a core metal 34 and a fluorine resin layer 35 on its surface. A metal ionic compound of a metal selected from the group consisting of transition metal, aluminium and gallium is contained in the coating oil 41, whereby the rubber deterioration of the fixing roller 29 and the pressure roller 30 is reduced. As the transition metal, scandium, titanium and vanadium are desirably used.

49. 发明专利

JPH08305213A IMAGE FORMING APPARATUS 失效
公开(公告)号：JPH08305213A
公开(公告)日：1996-11-22
申请号：JP12754995
申请日：1995-04-28
申请人： CANON KK
发明人： SAITOU RIE , ISHIZUKA JIRO , SAKAMI YUJI , INOUE MASAHIRO , OTA MITSUHIRO
IPC分类号： B41J2/525 , G01B11/06 , G03G15/20
摘要： PURPOSE: To provide an image forming apparatus, by which good fixability and glossiness can be obtained according to the thickness of a recording material without damaging high speed performance even if the rubber layer of the surface layer of a fixing roller is thick by making both the fixing roller and a pressure roller as a roller of a three-layer structure in which the surface layer and the lowermost layer are silicone rubber and the intermediate layer is an oil resistant layer of fluorine-contained rubber. CONSTITUTION: An upper roller 121 and a lower roller 122 are disposed on this side of a register roller, and the thickness of recording paper P clamped between the upper roller 121 and the lower roller 122 is detected in the process of copy sequence by an amplifier type displacement sensor 123. According to the inclusion of the detection or the copy number, the optimum fixing speed is selected from a previously stored table, and fixing is performed at the selected fixing speed by a fixing device.

50. 发明专利

JPH08202199A IMAGE FORMING DEVICE 失效
公开(公告)号：JPH08202199A
公开(公告)日：1996-08-09
申请号：JP835895
申请日：1995-01-23
申请人： CANON KK
发明人： INOUE MASAHIRO , SAKAMI YUJI , SAITOU RIE , ISHIZUKA JIRO , OTA MITSUHIRO
IPC分类号： G03G15/20 , G03G15/00 , H04N1/00 , H04N1/29
摘要： PURPOSE: To reproduce glossiness faithful to an original image and to form a high-quality image by selecting a fixing condition or the kind of a recording material according to the glossiness of the original image and deciding the image formed on the first surface of the recording material. CONSTITUTION: When an original 101 is irradiated by irradiation light sources 103 and 108, light reflected from the original 101 by the light source 103 passes through an image forming element array 104 and an infrared-ray cut filter 105 and it arrives at a CCD (contact type color sensor) 106. Then, the image thereof is formed. On the other hand, the light reflected from the original 101 passes through a condensing lens 110 and it arrives at a photodetector 109. Then, an optical system unit 107 successively scans the original 101 on a platen 102 while it moves in a direction shown by an arrow C. Based on image information read by the CCD 106, the range of the original, the irradiating light quantity of the original and the like are calculated and decided. Besides, the reflected light is converted to a gloss value (glossiness) based on the image information of the photodetector 109. Then, the correction value of the fixing condition is decided and transmitted to a printer side.

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