公开(公告)号：US10295939B2

公开(公告)日：2019-05-21

申请号：US15627693

申请日：2017-06-20

申请人： Hiroshi Yoshinaga ,  Kenji Ishii ,  Ippei Fujimoto ,  Takashi Seto ,  Takayuki Seki ,  Kazunari Sawada ,  Ryohei Matsuda

发明人： Hiroshi Yoshinaga ,  Kenji Ishii ,  Ippei Fujimoto ,  Takashi Seto ,  Takayuki Seki ,  Kazunari Sawada ,  Ryohei Matsuda

IPC分类号： G03G15/20

摘要： A fixing device includes an endless belt and a pressure rotator disposed opposite an outer circumferential surface of the endless belt. The pressure rotator has a first span in an axial direction of the endless belt. A nip formation pad, which is disposed opposite an inner circumferential surface of the endless belt, forms a fixing nip between the endless belt and the pressure rotator. The nip formation pad includes a belt-side face disposed opposite the endless belt. A radiant heater, which is disposed opposite the inner circumferential surface of the endless belt, heats the endless belt. A thermal conduction aid, which contacts the belt-side face of the nip formation pad, conducts heat in the axial direction of the endless belt. The thermal conduction aid has a second span within which the first span of the pressure rotator is provided at the fixing nip.

公开(公告)号：US10281850B2

公开(公告)日：2019-05-07

申请号：US15980123

申请日：2018-05-15

申请人： Ryohei Matsuda ,  Ippei Fujimoto ,  Kenji Ishii ,  Hiroshi Yoshinaga ,  Takayuki Seki ,  Kazunari Sawada

发明人： Ryohei Matsuda ,  Ippei Fujimoto ,  Kenji Ishii ,  Hiroshi Yoshinaga ,  Takayuki Seki ,  Kazunari Sawada

IPC分类号： G03G15/20

摘要： A fixing device includes an endless fixing belt, a heat source, an opposed member, a nip formation pad, and a heat conductive member. The nip formation pad includes an abutment region, a first opening portion, and second opening portions. The abutment region includes a plurality of abutment surfaces abutting a first face of the heat conductive member. The first opening portion is disposed at a center of the abutment region to form a non-contact area at which the nip formation pad does not contact the heat conductive member. The abutment region includes an upstream abutment area and a downstream abutment area from the first opening portion in a direction of conveyance of a recording medium. The second opening portions divide at least one area of the upstream abutment area and the downstream abutment area into a plurality of portions in a longitudinal direction of the nip formation pad.

公开(公告)号：US10222732B2

公开(公告)日：2019-03-05

申请号：US15440179

申请日：2017-02-23

申请人： Takayuki Seki ,  Kenji Ishii ,  Hiroshi Yoshinaga ,  Takashi Seto ,  Ippei Fujimoto ,  Kazunari Sawada ,  Ryohei Matsuda

发明人： Takayuki Seki ,  Kenji Ishii ,  Hiroshi Yoshinaga ,  Takashi Seto ,  Ippei Fujimoto ,  Kazunari Sawada ,  Ryohei Matsuda

IPC分类号： G03G15/20

摘要： A fixing device includes a fixing rotator, an opposed rotator disposed opposite the fixing rotator, a pressure pad, a lateral end heater, and a thermal conduction aid. The pressure pad presses against the opposed rotator via the fixing rotator to form a fixing nip between the fixing rotator and the opposed rotator. The lateral end heater is disposed on the pressure pad to heat a lateral end of the fixing rotator in the axial direction of the fixing rotator. The thermal conduction aid is interposed between the pressure pad and the fixing rotator to decrease a temperature gradient of the fixing rotator in an axial direction of the fixing rotator. The pressure pad includes a nip-side face disposed opposite the thermal conduction aid. The lateral end heater includes a nip-side face being disposed opposite the thermal conduction aid and projecting beyond the nip-side face of the pressure pad.

公开(公告)号：US20180356754A1

公开(公告)日：2018-12-13

申请号：US15984674

申请日：2018-05-21

申请人： Hiroshi Yoshinaga ,  Ippei Fujimoto ,  Kenji Ishii ,  Takayuki Seki ,  Kazunari Sawada ,  Ryohei Matsuda

发明人： Hiroshi Yoshinaga ,  Ippei Fujimoto ,  Kenji Ishii ,  Takayuki Seki ,  Kazunari Sawada ,  Ryohei Matsuda

IPC分类号： G03G15/20

CPC分类号： G03G15/2064

摘要： A fixing device includes an endless fixing rotator, a heater, a nip formation assembly, and an opposed rotator. The endless fixing rotator is rotatable in a direction of rotation. The heater heats the fixing rotator. The nip formation assembly is disposed opposite an inner circumferential surface of the fixing rotator. The opposed rotator is pressed against the nip formation assembly via the fixing rotator to form a fixing nip between the fixing rotator and the opposed rotator. The nip formation assembly includes a nip former to contact the inner circumferential surface of the fixing rotator, maintain a constant thickness against pressure from the opposed rotator, and transfer heat. The opposed rotator is shorter than the nip former in a longitudinal direction of the opposed rotator. The opposed rotator is disposed within an area opposite the nip former.

公开(公告)号：US10025247B2

公开(公告)日：2018-07-17

申请号：US15447709

申请日：2017-03-02

申请人： Kazunari Sawada ,  Ippei Fujimoto ,  Kenji Ishii ,  Takashi Seto ,  Takayuki Seki ,  Hiroshi Yoshinaga ,  Ryohei Matsuda

发明人： Kazunari Sawada ,  Ippei Fujimoto ,  Kenji Ishii ,  Takashi Seto ,  Takayuki Seki ,  Hiroshi Yoshinaga ,  Ryohei Matsuda

IPC分类号： G03G15/20

摘要： A fixing device includes fixing rotator, a heater to heat the fixing rotator, a pressure rotator disposed opposite an outer circumferential surface of the fixing rotator, a pressure pad disposed opposite an inner circumferential surface of the fixing rotator, a support to support the pressure pad, and a thermal conduction aid to conduct heat in an axial direction of the fixing rotator. The pressure pad presses against the pressure rotator via the fixing rotator to form a fixing nip between the fixing rotator and the pressure rotator. The pressure pad includes a nip-side face disposed opposite the inner circumferential surface of the fixing rotator. The thermal conduction aid covers the nip-side face of the pressure pad. The nip-side face of the pressure pad includes at least one mouth therein defining a non-contact area in which the pressure pad does not contact the thermal conduction aid.

公开(公告)号：US10197957B2

公开(公告)日：2019-02-05

申请号：US15969912

申请日：2018-05-03

申请人： Ippei Fujimoto ,  Kazunari Sawada ,  Kenji Ishii ,  Hiroshi Yoshinaga ,  Takayuki Seki ,  Ryohei Matsuda

发明人： Ippei Fujimoto ,  Kazunari Sawada ,  Kenji Ishii ,  Hiroshi Yoshinaga ,  Takayuki Seki ,  Ryohei Matsuda

IPC分类号： G03G15/20

摘要： A fixing device includes a fixing rotator, a plurality of heat sources having different heat distributions to heat the fixing rotator, a pressing member to press the fixing rotator and form a nip to fix the unfixed toner image on the recording material, a shield disposed between the plurality of heat sources, a plurality of temperature sensors each disposed opposite to the heat source, a processor to control the plurality of heat sources so that a temperature detected by the temperature sensor becomes a predetermined target temperature. The processor controls the heaters so that a temperature difference ΔT=T2−T1 becomes greater than zero, wherein T1 is the target temperature for the temperature sensor close to an entrance of the nip, and T2 is the target temperature for the temperature sensor far from the entrance of the nip.

公开(公告)号：US20180348680A1

公开(公告)日：2018-12-06

申请号：US15969912

申请日：2018-05-03

申请人： Ippei Fujimoto ,  Kazunari Sawada ,  Kenji Ishii ,  Hiroshi Yoshinaga ,  Takayuki Seki ,  Ryohei Matsuda

发明人： Ippei Fujimoto ,  Kazunari Sawada ,  Kenji Ishii ,  Hiroshi Yoshinaga ,  Takayuki Seki ,  Ryohei Matsuda

IPC分类号： G03G15/20

CPC分类号： G03G15/2039 ,  G03G15/2042 ,  G03G15/206

摘要： A fixing device includes a fixing rotator, a plurality of heat sources having different heat distributions to heat the fixing rotator, a pressing member to press the fixing rotator and form a nip to fix the unfixed toner image on the recording material, a shield disposed between the plurality of heat sources, a plurality of temperature sensors each disposed opposite to the heat source, a processor to control the plurality of heat sources so that a temperature detected by the temperature sensor becomes a predetermined target temperature. The processor controls the heaters so that a temperature difference ΔT=T2−T1 becomes greater than zero, wherein T1 is the target temperature for the temperature sensor close to an entrance of the nip, and T2 is the target temperature for the temperature sensor far from the entrance of the nip.

公开(公告)号：US10082751B2

公开(公告)日：2018-09-25

申请号：US15804459

申请日：2017-11-06

申请人： Takashi Seto ,  Kenji Ishii ,  Hiroshi Yoshinaga ,  Takayuki Seki ,  Ippei Fujimoto ,  Hiroyuki Shimada ,  Kazunari Sawada ,  Ryohei Matsuda

发明人： Takashi Seto ,  Kenji Ishii ,  Hiroshi Yoshinaga ,  Takayuki Seki ,  Ippei Fujimoto ,  Hiroyuki Shimada ,  Kazunari Sawada ,  Ryohei Matsuda

IPC分类号： G03G15/20

CPC分类号： G03G15/2025 ,  G03G15/2028 ,  G03G15/2053 ,  G03G2215/2035

摘要： A fixing device includes a belt, a pressure rotator disposed opposite the belt, and a nip formation unit that forms a fixing nip between the belt and the pressure rotator. The nip formation unit includes a guide face disposed upstream from the fixing nip in a rotation direction of the belt and contoured to separate from the pressure rotator in a direction opposite the rotation direction of the belt. The guide face is adhered with a lubricant moved from an inner circumferential surface of the belt. The belt rotates in the rotation direction when an outer circumferential surface of the belt has a temperature lower than a fixing temperature at which the belt fixes a toner image on a recording medium. The belt rotating in the rotation direction brings the lubricant adhered to the guide face into contact with the belt.

公开(公告)号：US10295937B2

公开(公告)日：2019-05-21

申请号：US15684298

申请日：2017-08-23

申请人： Kazunari Sawada ,  Ippei Fujimoto ,  Kenji Ishii ,  Hiroyuki Shimada ,  Takashi Seto ,  Hiroshi Yoshinaga ,  Takayuki Seki

发明人： Kazunari Sawada ,  Ippei Fujimoto ,  Kenji Ishii ,  Hiroyuki Shimada ,  Takashi Seto ,  Hiroshi Yoshinaga ,  Takayuki Seki

IPC分类号： G03G15/20

摘要： A fixing device includes a heat generator being disposed inside a loop formed by a rotator and including a heat generating portion to radiate radiant heat. A reflector is disposed inside the loop formed by the rotator and includes a reflection face to reflect the radiant heat radiated from the heat generator toward the rotator. A support supports the reflector. A holder holds each lateral end of the support in a longitudinal direction of the support, which is perpendicular to the rotation direction of the rotator. A fastener attaches the reflector to the support at an attachment position disposed at each lateral end of the reflector in a longitudinal direction of the reflector. The attachment position is disposed outboard from a lateral edge of the heat generating portion of the heat generator and disposed inboard from the holder in the longitudinal direction of the reflector.

公开(公告)号：US09989905B2

公开(公告)日：2018-06-05

申请号：US15604294

申请日：2017-05-24

申请人： Takayuki Seki ,  Takashi Seto ,  Hiroshi Yoshinaga ,  Kenji Ishii ,  Ippei Fujimoto ,  Kazunari Sawada

发明人： Takayuki Seki ,  Takashi Seto ,  Hiroshi Yoshinaga ,  Kenji Ishii ,  Ippei Fujimoto ,  Kazunari Sawada

IPC分类号： G03G15/20

CPC分类号： G03G15/2053 ,  G03G15/2042 ,  G03G2215/2035

摘要： A fixing device includes a nip formation pad which is disposed opposite an endless belt and forms a fixing nip between the endless belt and a pressure rotator. A contact heater is disposed at least at one lateral end of the nip formation pad in a longitudinal direction thereof and heats at least one lateral end of the endless belt in an axial direction thereof. A thermal conduction aid contacts a belt-side face of each of the nip formation pad and the contact heater and conducts heat in the axial direction of the endless belt. A cover is disposed outboard from the thermal conduction aid in a longitudinal direction thereof. The cover covers the belt-side face of the contact heater. The contact heater includes a power supply portion disposed outboard from the thermal conduction aid in the longitudinal direction thereof and covered by the cover.