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：US10042293B2

公开(公告)日：2018-08-07

申请号：US15383369

申请日：2016-12-19

申请人： Naoto Kochi ,  Shinya Tanaka ,  Takehide Mizutani

发明人： Naoto Kochi ,  Shinya Tanaka ,  Takehide Mizutani

IPC分类号： G03G15/16

摘要： An image forming apparatus includes a transfer power supply and a controller. The controller is configured to execute control for an end-portion voltage that is a DC voltage of a transfer bias at a time of transferring a toner image to an end portion of a recording sheet and a body-portion voltage that is a DC voltage of a transfer bias at a time of transferring a toner image to a body portion on a rear side of an end portion of a recording sheet, such that the end-portion voltage is set to be higher than the body-portion voltage in the DC transfer bias and a value obtained by dividing the end-portion voltage by the body-portion voltage in the superimposed transfer bias is set to be smaller than a value obtained by dividing the end-portion voltage by the body-portion voltage in the DC transfer bias.

公开(公告)号：US09395659B2

公开(公告)日：2016-07-19

申请号：US14259337

申请日：2014-04-23

申请人： Shinya Tanaka ,  Hirokazu Ishii ,  Tsutomu Kato ,  Yasufumi Takahashi ,  Takehide Mizutani ,  Osamu Ichihashi ,  Yuji Kato ,  Atsushi Nagata ,  Kazuosa Kuma ,  Ryo Hasegawa ,  Haruki Nagata ,  Naoto Kochi

发明人： Shinya Tanaka ,  Hirokazu Ishii ,  Tsutomu Kato ,  Yasufumi Takahashi ,  Takehide Mizutani ,  Osamu Ichihashi ,  Yuji Kato ,  Atsushi Nagata ,  Kazuosa Kuma ,  Ryo Hasegawa ,  Haruki Nagata ,  Naoto Kochi

IPC分类号： G03G15/16

CPC分类号： G03G15/1675 ,  G03G15/1605

摘要： An image forming apparatus includes an image carrier that carries a toner image; a transfer member that forms a transfer nip between the transfer member and the image carrier; and a power supply capable of outputting a superimposed transfer bias in which an alternating current component is superimposed onto a direct current component. The toner image on the image carrier is transferred onto a recording medium in the transfer nip by the superimposed transfer bias or a direct current bias consisting of the direct current component output by the power supply. The apparatus also includes a controller that controls the power supply so that an output target value of the direct current component when the direct current component rises up is larger than an output target value of the direct current component when the toner image is transferred onto the recording medium.

摘要翻译： 图像形成装置包括承载调色剂图像的图像载体; 转印部件，其在转印部件和图像载体之间形成转印辊隙; 以及能够输出叠加在直流分量上的交流分量的叠加转印偏压的电源。 图像载体上的调色剂图像通过叠加的转印偏压或由电源输出的直流分量组成的直流偏压转印到转印辊隙中的记录介质上。 该装置还包括控制器，其控制电源，使得当直流分量上升时直流分量的输出目标值大于当调色剂图像被转印到记录上时的直流分量的输出目标值 中。

公开(公告)号：US20140328604A1

公开(公告)日：2014-11-06

申请号：US14259337

申请日：2014-04-23

申请人： Shinya TANAKA ,  Hirokazu Ishii ,  Tsutomu Kato ,  Yasufumi Takahashi ,  Takehide Mizutani ,  Osamu Ichihashi ,  Yuji Kato ,  Atsushi Nagata ,  Kazuosa Kuma ,  Ryo Hasegawa ,  Haruki Nagata ,  Naoto Kochi

发明人： Shinya TANAKA ,  Hirokazu Ishii ,  Tsutomu Kato ,  Yasufumi Takahashi ,  Takehide Mizutani ,  Osamu Ichihashi ,  Yuji Kato ,  Atsushi Nagata ,  Kazuosa Kuma ,  Ryo Hasegawa ,  Haruki Nagata ,  Naoto Kochi

IPC分类号： G03G15/16

CPC分类号： G03G15/1675 ,  G03G15/1605

摘要： An image forming apparatus includes an image carrier that carries a toner image; a transfer member that forms a transfer nip between the transfer member and the image carrier; and a power supply capable of outputting a superimposed transfer bias in which an alternating current component is superimposed onto a direct current component. The toner image on the image carrier is transferred onto a recording medium in the transfer nip by the superimposed transfer bias or a direct current bias consisting of the direct current component output by the power supply. The apparatus also includes a controller that controls the power supply so that an output target value of the direct current component when the direct current component rises up is larger than an output target value of the direct current component when the toner image is transferred onto the recording medium.

摘要翻译： 图像形成装置包括承载调色剂图像的图像载体; 转印部件，其在转印部件和图像载体之间形成转印辊隙; 以及能够输出叠加在直流分量上的交流分量的叠加转印偏压的电源。 图像载体上的调色剂图像通过叠加的转印偏压或由电源输出的直流分量组成的直流偏压转印到转印辊隙中的记录介质上。 该装置还包括控制器，其控制电源，使得当直流分量上升时直流分量的输出目标值大于当调色剂图像被转印到记录上时的直流分量的输出目标值 中。

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：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：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：US09645530B2

公开(公告)日：2017-05-09

申请号：US15142424

申请日：2016-04-29

申请人： Naoto Kochi ,  Kenji Sugiura ,  Hirokazu Ishii ,  Hiroyoshi Haga ,  Yuuji Wada ,  Takehide Mizutani ,  Naohiro Kumagai ,  Junpei Fujita ,  Tatsuya Ohsugi ,  Kazuki Yogosawa

发明人： Naoto Kochi ,  Kenji Sugiura ,  Hirokazu Ishii ,  Hiroyoshi Haga ,  Yuuji Wada ,  Takehide Mizutani ,  Naohiro Kumagai ,  Junpei Fujita ,  Tatsuya Ohsugi ,  Kazuki Yogosawa

IPC分类号： G03G15/16

CPC分类号： G03G15/163 ,  G03G15/1605 ,  G03G15/1675 ,  G03G2215/0129

摘要： An image forming apparatus includes an image bearer, a transfer device contacting the image bearer to form a transfer portion, a transfer bias power source, and a controller. A ratio of a time period of application of the opposite-directional bias to a total time period of one cycle of the AC component of the superimposed bias is greater than 50%. A ratio of a value of the DC component of the superimposed bias output within a region ranging from a leading end of the recording medium to a predetermined length to a value of the DC component of the superimposed bias output outside the region is greater than a ratio of a value of the AC component of the superimposed bias output within the region to a value of the AC component of the superimposed bias output outside the region.