公开(公告)号：US10281848B2

公开(公告)日：2019-05-07

申请号：US15427735

申请日：2017-02-08

申请人： Yuuji Wada ,  Naoto Kochi ,  Hiroki Nakamatsu ,  Kazuki Yogosawa ,  Takahiro Suzuki ,  Shinya Tanaka ,  Kenji Sugiura ,  Naohiro Kumagai ,  Seiichi Kogure ,  Junpei Fujita ,  Hirokazu Ishii ,  Takehide Mizutani ,  Atsushi Nagata ,  Keigo Nakamura

发明人： Yuuji Wada ,  Naoto Kochi ,  Hiroki Nakamatsu ,  Kazuki Yogosawa ,  Takahiro Suzuki ,  Shinya Tanaka ,  Kenji Sugiura ,  Naohiro Kumagai ,  Seiichi Kogure ,  Junpei Fujita ,  Hirokazu Ishii ,  Takehide Mizutani ,  Atsushi Nagata ,  Keigo Nakamura

IPC分类号： G03G15/16 ,  G03G15/00

摘要： An improved image forming apparatus includes an image bearer, a nip forming member, a transfer power source, and a controller. The controller switches a transfer mode between a first mode to transfer the toner image onto a first type sheet having a surface smoothness higher than a surface smoothness of a second type sheet and a second mode to transfer the toner image onto the second type sheet. The controller controls the transfer power source to output the transfer bias having an opposite-peak duty of greater than or equal to 50% that is a duty on the side of the opposite-peak value in the first mode. The controller controls the transfer power source to output the transfer bias having an opposite-peak duty of less than 50%, which is different from the opposite-peak duty of the first mode, in the second mode.

公开(公告)号：US10295948B2

公开(公告)日：2019-05-21

申请号：US15483548

申请日：2017-04-10

申请人： Keigo Nakamura ,  Hirokazu Ishii ,  Kenji Sugiura ,  Takehide Mizutani ,  Atsushi Nagata ,  Naoto Kochi ,  Yuuji Wada ,  Shinya Tanaka

发明人： Keigo Nakamura ,  Hirokazu Ishii ,  Kenji Sugiura ,  Takehide Mizutani ,  Atsushi Nagata ,  Naoto Kochi ,  Yuuji Wada ,  Shinya Tanaka

IPC分类号： G03G15/00 ,  G03G21/20 ,  G03G15/16

摘要： An image forming apparatus including an image bearer, a transfer-bias power source, an environment sensor, and a controller. The controller controls the transfer-bias power source to change the DC component and the AC component, according to the at least one of temperature and humidity detected by the environment sensor and a duty of the transfer bias. The duty is A/(A+B)×100[%] where A denotes an area on a return-directional side to move toner from the recording sheet back to the image bearer, relative to a center value (Voff) of a maximum value and a minimum value of the transfer bias in one cycle of a waveform of the transfer bias, and B denotes an area on a transfer-directional side to move the toner from the image bearer to the recording sheet, relative to the center value (Voff) in the one cycle.

公开(公告)号：US20170299994A1

公开(公告)日：2017-10-19

申请号：US15483221

申请日：2017-04-10

申请人： Atsushi NAGATA ,  Shinya Tanaka ,  Hirokazu Ishii ,  Kenji Sugiura ,  Takehide Mizutani ,  Keigo Nakamura ,  Yuuji Wada ,  Naoto Kochi

发明人： Atsushi NAGATA ,  Shinya Tanaka ,  Hirokazu Ishii ,  Kenji Sugiura ,  Takehide Mizutani ,  Keigo Nakamura ,  Yuuji Wada ,  Naoto Kochi

IPC分类号： G03G15/00 ,  H04N1/032 ,  G03G15/04 ,  G06K15/12 ,  G03G15/043

CPC分类号： G03G15/5037 ,  G03G15/04 ,  G03G15/043 ,  G06K15/12 ,  H04N1/032

摘要： An image forming apparatus includes an image bearer, an image forming device to form a toner image on the image bearer with toner, a power source to output a bias to transfer the toner image onto a recording medium, and control circuitry. The circuitry controls the power source to decrease a peak-to-peak voltage of the bias in response to increase in at least one of temperature and humidity, when a time-averaged voltage of the bias is on a transfer side of transferring the toner to the recording medium, from a median value of maximum and minimum voltages of the bias. The circuitry controls the power source to increase the peak-to-peak voltage of the bias in response to increase in at least one of temperature and humidity, when the time-averaged voltage of the bias is on a return side of returning the toner to the image bearer, from the median value.

公开(公告)号：US10073386B2

公开(公告)日：2018-09-11

申请号：US15482837

申请日：2017-04-10

申请人： Naomi Sugimoto ,  Hirokazu Ishii ,  Kenji Sugiura ,  Atsushi Nagata ,  Takehide Mizutani ,  Keigo Nakamura ,  Yuuji Wada ,  Naoto Kochi ,  Shinya Tanaka

发明人： Naomi Sugimoto ,  Hirokazu Ishii ,  Kenji Sugiura ,  Atsushi Nagata ,  Takehide Mizutani ,  Keigo Nakamura ,  Yuuji Wada ,  Naoto Kochi ,  Shinya Tanaka

IPC分类号： G03G15/16

CPC分类号： G03G15/1665 ,  G03G15/1605 ,  G03G15/1675 ,  G03G15/5016 ,  G03G15/6591 ,  G03G2215/00751

摘要： An image forming apparatus including an image bearer; a nip forming member, a nip width changing device, a power source; and a controller. The controller switches between a first mode and a second mode according to a predetermined condition. In the first mode, a duty of the transfer bias is a first duty and a width of a transfer nip is a first width. In the second mode, the duty of the transfer bias is a second duty lower than the first duty and the width of the transfer nip is a second width greater than the first width. The duty is (T−Tt)/T×100% where T denotes one cycle of the transfer bias, and Tt denotes a time period, in which the transfer bias is on a transfer-directional side relative to a time-averaged value of the transfer bias, in the one cycle.

公开(公告)号：US10067454B2

公开(公告)日：2018-09-04

申请号：US15483221

申请日：2017-04-10

申请人： Atsushi Nagata ,  Shinya Tanaka ,  Hirokazu Ishii ,  Kenji Sugiura ,  Takehide Mizutani ,  Keigo Nakamura ,  Yuuji Wada ,  Naoto Kochi

发明人： Atsushi Nagata ,  Shinya Tanaka ,  Hirokazu Ishii ,  Kenji Sugiura ,  Takehide Mizutani ,  Keigo Nakamura ,  Yuuji Wada ,  Naoto Kochi

IPC分类号： G03G15/00 ,  H04N1/032 ,  G03G15/04 ,  G06K15/12 ,  G03G15/043

摘要： An image forming apparatus includes an image bearer, an image forming device to form a toner image on the image bearer with toner, a power source to output a bias to transfer the toner image onto a recording medium, and control circuitry. The circuitry controls the power source to decrease a peak-to-peak voltage of the bias in response to increase in at least one of temperature and humidity, when a time-averaged voltage of the bias is on a transfer side of transferring the toner to the recording medium, from a median value of maximum and minimum voltages of the bias. The circuitry controls the power source to increase the peak-to-peak voltage of the bias in response to increase in at least one of temperature and humidity, when the time-averaged voltage of the bias is on a return side of returning the toner to the image bearer, from the median value.

公开(公告)号：US20170299987A1

公开(公告)日：2017-10-19

申请号：US15482837

申请日：2017-04-10

申请人： Naomi SUGIMOTO ,  Hirokazu Ishii ,  Kenji Sugiura ,  Atsushi Nagata ,  Takehide Mizutani ,  Keigo Nakamura ,  Yuuji Wada ,  Naoto Kochi ,  Shinya Tanaka

发明人： Naomi SUGIMOTO ,  Hirokazu Ishii ,  Kenji Sugiura ,  Atsushi Nagata ,  Takehide Mizutani ,  Keigo Nakamura ,  Yuuji Wada ,  Naoto Kochi ,  Shinya Tanaka

IPC分类号： G03G15/16

CPC分类号： G03G15/1665 ,  G03G15/1605 ,  G03G15/1675 ,  G03G15/5016 ,  G03G15/6591 ,  G03G2215/00751

摘要： An image forming apparatus including an image bearer; a nip forming member, a nip width changing device, a power source; and a controller. The controller switches between a first mode and a second mode according to a predetermined condition. In the first mode, a duty of the transfer bias is a first duty and a width of a transfer nip is a first width. In the second mode, the duty of the transfer bias is a second duty lower than the first duty and the width of the transfer nip is a second width greater than the first width. The duty is (T−Tt)/T×100% where T denotes one cycle of the transfer bias, and Tt denotes a time period, in which the transfer bias is on a transfer-directional side relative to a time-averaged value of the transfer bias, in the one cycle.

公开(公告)号：US20130236201A1

公开(公告)日：2013-09-12

申请号：US13785621

申请日：2013-03-05

申请人： Takehide Mizutani ,  Shinya Tanaka ,  Yasunobu Shimizu ,  Hirokazu Ishii ,  Keigo Nakamura

发明人： Takehide Mizutani ,  Shinya Tanaka ,  Yasunobu Shimizu ,  Hirokazu Ishii ,  Keigo Nakamura

IPC分类号： G03G15/16 ,  G03G15/08

CPC分类号： G03G15/1675 ,  G03G15/1605 ,  G03G15/556 ,  G03G15/6591

摘要： An image forming apparatus includes a toner forced consumption control unit that performs toner forced consumption control in which toner in a developing unit is forcibly consumed when a certain condition to perform the toner forced consumption control is met. The certain condition to perform the toner forced consumption control includes a specific performance condition that a transfer bias switching condition to switch a transfer bias to a superimposed transfer bias in which an alternating current component is superimposed on a direct current component, from a direct current transfer bias is met. When the specific performance condition is met, the toner forced consumption control unit performs preliminary toner forced consumption control in which the toner forced consumption control is performed before an image forming operation using the superimposed transfer bias is started.

摘要翻译： 图像形成装置包括调色剂强制消耗控制单元，其执行调色剂强制消耗控制，其中当执行调色剂强制消耗控制的特定条件时，显影单元中的调色剂被强制消耗。 执行调色剂强制消耗控制的特定条件包括：特定的性能条件，即转印偏压切换条件，其将转印偏压切换到其中交流分量叠加在直流分量上的叠加转印偏压，从直流转印 偏见得到满足。 当满足特定性能条件时，调色剂强制消耗控制单元在开始使用叠加的转印偏压的图像形成操作之前执行调色剂强制消耗控制的初步调色剂强制消耗控制。

公开(公告)号：US09046830B2

公开(公告)日：2015-06-02

申请号：US14173122

申请日：2014-02-05

申请人： Shinya Tanaka ,  Hirokazu Ishii ,  Yasunobu Shimizu ,  Takehide Mizutani ,  Keigo Nakamura

发明人： Shinya Tanaka ,  Hirokazu Ishii ,  Yasunobu Shimizu ,  Takehide Mizutani ,  Keigo Nakamura

IPC分类号： G03G15/16

CPC分类号： G03G15/1675 ,  G03G15/1605

摘要： An image forming apparatus includes a rotatable image bearing member, a nip forming member, and a power source. The rotatable image bearing member bears a toner image on a surface thereof and rotates. The nip forming member contacts the surface of the image bearing member to form a transfer nip therebetween. The power source applies a transfer bias to the transfer nip to transfer the toner image from the image bearing member onto a recording medium interposed in the transfer nip. The transfer bias includes a superimposed transfer bias in which an alternating current (AC) component is superimposed on a direct current (DC) component and a polarity of the superimposed transfer bias changes with time. A phase difference between an AC voltage and an AC current output from the power source is equal to or less than 0.47 cycles.

摘要翻译： 图像形成装置包括可旋转图像承载部件，辊隙形成部件和动力源。 可旋转图像承载部件在其表面上承载调色剂图像并旋转。 辊隙形成构件接触图像承载构件的表面以在它们之间形成转印辊隙。 电源将转印偏压施加到转印压区，以将调色剂图像从图像承载部件转印到介于转印辊隙中的记录介质上。 转印偏压包括其中交流（AC）分量叠加在直流（DC）分量上并且叠加转印偏压的极性随时间变化的叠加转印偏压。 交流电压与从电源输出的交流电流之间的相位差等于或小于0.47个周期。

公开(公告)号：US08965227B2

公开(公告)日：2015-02-24

申请号：US13785621

申请日：2013-03-05

申请人： Takehide Mizutani ,  Shinya Tanaka ,  Yasunobu Shimizu ,  Hirokazu Ishii ,  Keigo Nakamura

发明人： Takehide Mizutani ,  Shinya Tanaka ,  Yasunobu Shimizu ,  Hirokazu Ishii ,  Keigo Nakamura

IPC分类号： G03G15/16 ,  G03G15/00

CPC分类号： G03G15/1675 ,  G03G15/1605 ,  G03G15/556 ,  G03G15/6591

摘要： An image forming apparatus includes a toner forced consumption control unit that performs toner forced consumption control in which toner in a developing unit is forcibly consumed when a certain condition to perform the toner forced consumption control is met. The certain condition to perform the toner forced consumption control includes a specific performance condition that a transfer bias switching condition to switch a transfer bias to a superimposed transfer bias in which an alternating current component is superimposed on a direct current component, from a direct current transfer bias is met. When the specific performance condition is met, the toner forced consumption control unit performs preliminary toner forced consumption control in which the toner forced consumption control is performed before an image forming operation using the superimposed transfer bias is started.

摘要翻译： 图像形成装置包括调色剂强制消耗控制单元，其执行调色剂强制消耗控制，其中当执行调色剂强制消耗控制的特定条件时，显影单元中的调色剂被强制消耗。 执行调色剂强制消耗控制的特定条件包括：特定的性能条件，即转印偏压切换条件，其将转印偏压切换到其中交流分量叠加在直流分量上的叠加转印偏压，从直流转印 偏见得到满足。 当满足特定性能条件时，调色剂强制消耗控制单元在开始使用叠加的转印偏压的图像形成操作之前执行调色剂强制消耗控制的初步调色剂强制消耗控制。

公开(公告)号：US09195179B2

公开(公告)日：2015-11-24

申请号：US13747629

申请日：2013-01-23

申请人： Yasunobu Shimizu ,  Shinya Tanaka ,  Hiromi Ogiyama ,  Hirokazu Ishii ,  Keigo Nakamura

发明人： Yasunobu Shimizu ,  Shinya Tanaka ,  Hiromi Ogiyama ,  Hirokazu Ishii ,  Keigo Nakamura

IPC分类号： G03G15/16 ,  G03G15/00 ,  G03G15/01

CPC分类号： G03G15/1645 ,  G03G15/0189 ,  G03G15/1605 ,  G03G15/5029 ,  G03G2215/00751

摘要： A transfer device includes a transfer bias power source, a switching device, and a sheet dependent condition setting device. The transfer bias power source applies to a transfer member, based on sheet dependent conditions for a recording medium onto which a toner image is transferred, one of a DC transfer bias and a superimposed transfer bias including an alternating current (AC) component superimposed on a DC component. The switching device switches a transfer mode between a DC transfer mode in which the DC transfer bias is applied to the transfer device and a superimposed-bias transfer mode in which the superimposed transfer bias is applied to the transfer device. The sheet dependent condition setting device sets arbitrarily at least one of the sheet dependent conditions for the recording medium at the superimposed-bias transfer mode. The sheet dependent conditions include a DC component value and an AC component value.

摘要翻译： 转印装置包括转印偏压电源，开关装置和片材相关条件设定装置。 转印偏压电源基于转印有调色剂图像的记录介质的片材相关条件，转印偏压电源施加到转印偏压电源，其中DC转印偏压和包括交叠电流（AC）分量叠加在一起的叠加转印偏压 直流分量。 切换装置在其中向转印装置施加DC转印偏压的DC转印模式和向转印装置施加叠加的转印偏压的叠加偏压转印模式之间切换转印模式。 片材相关条件设定装置以叠加偏置传送模式任意设定记录介质的片材相关条件中的至少一个。 片材相关条件包括DC分量值和AC分量值。