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公开(公告)号：US20230408948A1
公开(公告)日：2023-12-21
申请号：US18331678
申请日：2023-06-08
发明人： Yasuhiro MICHISHITA , Keisuke OBA , Koji UNO
CPC分类号： G03G15/0233 , G03G15/04 , G03G21/06 , G03G15/1605 , G03G15/167 , G03G2221/0047
摘要： An image forming apparatus includes a plurality of image forming portions, an intermediate transfer belt, a primary transfer member, a secondary transfer roller, a counter roller, and a charge eliminating device. The counter roller is pressed against the secondary transfer roller via an intermediate transfer belt to thereby form a secondary transfer nip portion. The charge eliminating device includes a charge eliminating needle that is disposed with an end part thereof pointing to a downstream side in a conveyance direction of the recording medium, and that is grounded, and a charge eliminating needle protection cover that has a guide surface that is opposed to the recording medium having passed through the secondary transfer nip portion, and that maintains a constant interval between the recording medium and the charge eliminating needle, and eliminates residual charge on the recording medium having passed through the secondary transfer nip portion.
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公开(公告)号：US20240142899A1
公开(公告)日：2024-05-02
申请号：US18490578
申请日：2023-10-19
发明人： Keisuke OBA , Koji UNO , Yasuhiro MICHISHITA
CPC分类号： G03G15/1615 , G03G15/18 , G03G2215/0016
摘要： The intermediate transfer unit includes: an endless intermediate transfer belt which is turned around while carrying a toner image on its outer circumferential surface; and a plurality of rollers on which the intermediate transfer belt is turnably stretched, wherein the intermediate transfer belt has, on its inner circumferential surface, an information recording area in which belt information has been recorded, and the intermediate transfer belt has a mark at a position in the outer circumferential surface where a positional relationship between the mark and the information recording area comes to a specified relationship.
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公开(公告)号：US20230408947A1
公开(公告)日：2023-12-21
申请号：US18331662
申请日：2023-06-08
发明人： Yasuhiro MICHISHITA , Keisuke OBA , Koji UNO
IPC分类号： G03G15/01 , G03G15/045 , G03G15/16
CPC分类号： G03G15/0121 , G03G15/011 , G03G15/045 , G03G15/1605 , G03G15/1665 , G03G15/165
摘要： An image forming apparatus includes a plurality of image forming portions, an intermediate transfer belt, a primary transfer member, a secondary transfer roller, a counter roller, and a charge eliminating device. The counter roller is pressed against the secondary transfer roller via an intermediate transfer belt to thereby form a secondary transfer nip portion. The charge eliminating device includes a charge eliminating needle that is disposed with an end part thereof pointing to a downstream side in a conveyance direction of the recording medium, and that is grounded, and a charge eliminating needle protection cover that has a guide surface that is opposed to the recording medium having passed through the secondary transfer nip portion. The guide surface is formed of a conductive material having a resistance value of 106Ω or lower, and is in a floating state.
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公开(公告)号：US20230418191A1
公开(公告)日：2023-12-28
申请号：US18338010
申请日：2023-06-20
发明人： Koji UNO , Keisuke OBA , Yasuhiro MICHISHITA
CPC分类号： G03G15/1675 , G03G15/80 , G03G15/5054 , G03G15/1685 , G03G2215/1614 , G03G2215/1623
摘要： An image forming apparatus includes an image carrying member, an intermediate transfer belt, a primary transfer roller, a first belt support roller, a secondary transfer roller, a second belt support roller, a current output portion, a current sensing portion, and a control portion. The current output portion passes across the secondary transfer roller a secondary transfer current as part of an output current. The current output portion and the second belt support roller are electrically connected together. The current sensing portion senses a leakage current passing from the first belt support roller via the intermediate transfer belt to the second belt support roller. The control portion sets the output current such that the secondary transfer current has a value given by subtracting a leakage current from the output current and keeps the voltage on the second belt support roller between −50 V and 50 V, inclusive.
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公开(公告)号：US20190265627A1
公开(公告)日：2019-08-29
申请号：US16235078
申请日：2018-12-28
摘要： An image forming apparatus has an image forming portion, a fixing device, a temperature sensing device, and a control portion. The fixing device has a fixing member having a heated rotary member and a pressing member forming a fixing nip by making contact with the heated rotary member. The temperature sensing device senses the surface temperature of at least one of the heated rotary member and the pressing member in a plurality of regions in the axial direction. The control portion estimates the thickness distribution of the surface layer of at least one of the heated rotary member and the pressing member in the axial direction based on the time taken for the surface temperature in the plurality of regions to reach the predetermined temperature, and thereby estimates the lifetime of at least one of the heated rotary member or the pressing member based on the estimated thickness distribution.
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公开(公告)号：US20180335748A1
公开(公告)日：2018-11-22
申请号：US15953039
申请日：2018-04-13
发明人： Tamotsu SHIMIZU , Yoshihiro YAMAGISHI , Akifumi YAMAGUCHI , Koji UNO , Kenichi KASAMA , Yuta KITABAYASHI , Nobuyuki HAYASHI
CPC分类号： G03G21/0058 , G03G5/005 , G03G5/14704 , G03G15/0865 , G03G15/5008 , G03G15/5037 , G03G15/55 , G03G15/751 , G03G21/0011 , G03G21/0064 , G03G2221/0089
摘要： An image forming apparatus has a photosensitive member, a charging member, an exposing device, a developing device, a transfer member, a polishing member, a driving device, a voltage applying device, a torque detector, and a control portion. The photosensitive member has a photosensitive layer and a surface protection layer formed on the surface of the photosensitive layer. The polishing member has an elastic layer on its circumferential surface, and rotates with a linear velocity difference from that of the photosensitive member. The torque detector detects the torque of the driving device. The control portion estimates an attachment condition of discharge products to the surface of the photosensitive member based on the torque of the driving device detected by the torque detector. When the torque is equal to or higher than a predetermined value, the control portion performs an image degradation suppression process.
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公开(公告)号：US20160132015A1
公开(公告)日：2016-05-12
申请号：US14936218
申请日：2015-11-09
发明人： Koji UNO
IPC分类号： G03G21/00
CPC分类号： G03G15/161 , G03G15/0136 , G03G21/00 , G03G21/0035
摘要： An image forming apparatus includes an image forming unit, an intermediate transfer belt, a brush roller, a drive mechanism, a contact control mechanism, and an operation control unit. The image forming unit includes a photoconductor drum, and forms a toner image on an outer circumferential surface of the photoconductor drum. The operation control unit is configured to perform a cleaning mode including cleaning the brush roller while an image forming operation is not being performed, cause the contact control mechanism to set the photoconductor drum and the intermediate transfer belt to the non-contact phase in the cleaning mode, and cause the drive mechanism, in the non-contact phase, to drive the brush roller to rotate at a rotation speed higher than a rotation speed of the brush roller in the image forming operation, and drive the intermediate transfer belt.
摘要翻译： 图像形成装置包括图像形成单元，中间转印带，刷辊，驱动机构，接触控制机构和操作控制单元。 图像形成单元包括感光鼓，并且在感光鼓的外圆周表面上形成调色剂图像。 操作控制单元被配置为执行清洁模式，包括在不执行图像形成操作的同时清洁刷辊，使得接触控制机构将感光鼓和中间转印带设置在清洁中的非接触相位 模式，并且在非接触阶段使得驱动机构以高于图像形成操作中的刷辊的旋转速度的旋转速度驱动刷辊，并驱动中间转印带。
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公开(公告)号：US20230418205A1
公开(公告)日：2023-12-28
申请号：US18336835
申请日：2023-06-16
发明人： Koji UNO , Keisuke OBA , Yasuhiro MICHISHITA
CPC分类号： G03G15/80 , G03G15/162 , G03G15/0806 , G03G15/0131 , G03G15/5004 , G03G2215/00632
摘要： An image forming apparatus includes an image carrying member, an intermediate transfer belt, a primary transfer roller, a first belt support roller, a secondary transfer roller, a second belt support roller, a current feeder, a controller, a current sensor, and a rectifier. The current sensor has a lead member. The rectifier shuts off a current passing from the second belt support roller to the ground if the voltage on the second belt support roller is less than a predetermined reference voltage. The controller controls the output current such that the secondary transfer current has a current value resulting from subtracting a leak current from the output current and, when the lead member is in a conducting state, keeps the voltage on the second belt support roller less than the reference voltage.
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公开(公告)号：US20150301494A1
公开(公告)日：2015-10-22
申请号：US14685910
申请日：2015-04-14
发明人： Yuta KITABAYASHI , Koji UNO , Satoshi UEMURA
IPC分类号： G03G15/00
CPC分类号： G03G15/161 , G03G2215/1661
摘要： An image forming apparatus includes an image carrier, a cleaning member, a rotation controlling part, a first obtaining part and a mode changing part. The image carrier has a surface to carry a toner image transferred onto a sheet. The cleaning member contacts the surface of the image carrier at a downstream side in a rotating direction of the image carrier from a transferring position transferring the toner image to collect a toner from the image carrier and to hold the toner. The rotation controlling part has a first speed control mode rotating the cleaning member at a first rotational speed and a second speed control mode rotating the cleaning member at a second rotational speed faster than the first rotational speed and switches from the first speed control mode to the second speed control mode at predetermined switch timing.
摘要翻译： 图像形成装置包括图像载体，清洁构件，旋转控制部，第一获得部和模式改变部。 图像载体具有用于承载转印到片材上的调色剂图像的表面。 清洁构件在图像载体的旋转方向的下游侧从转印调色剂图像的转印位置接触图像载体的表面，以从图像载体收集调色剂并保持调色剂。 旋转控制部具有第一速度控制模式，以第一旋转速度旋转清洁部件，第二速度控制模式以比第一旋转速度快的第二旋转速度旋转清洁部件，并且从第一速度控制模式切换到 第二速度控制模式。
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