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：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：US09256167B2

公开(公告)日：2016-02-09

申请号：US14449270

申请日：2014-08-01

申请人： Atsushi Nagata ,  Kenji Sugiura ,  Naohiro Kumagai ,  Seiichi Kogure ,  Junpei Fujita ,  Yuuji Wada ,  Yusuke Mitani ,  Kazuki Yogosawa

发明人： Atsushi Nagata ,  Kenji Sugiura ,  Naohiro Kumagai ,  Seiichi Kogure ,  Junpei Fujita ,  Yuuji Wada ,  Yusuke Mitani ,  Kazuki Yogosawa

IPC分类号： G03G15/16

CPC分类号： G03G15/1665 ,  G03G15/5058

摘要： An image forming apparatus includes an image bearer; a toner image forming unit, a transfer unit, a detector, and a controller. The toner image forming unit forms a plurality of types of density detection patterns on the surface of the image bearer in mutually-different positions in a surface-movement direction of the image bearer. The density detection patterns have mutually-different lengths in a direction orthogonal to the surface-movement direction of the image bearer. The transfer unit transfers the density detection patterns onto the surface of the transfer member. The detector detects image densities of the density detection patterns transferred on the surface of the transfer member. The controller calculates an image density difference between the density detection patterns on a basis of a detection result obtained by the detector, and corrects a transfer bias for transferring a toner image on a basis of a value of the image density difference.

摘要翻译： 图像形成装置包括图像载体; 调色剂图像形成单元，转印单元，检测器和控制器。 调色剂图像形成单元在图像承载体的表面移动方向上的相互不同的位置的图像载体的表面上形成多种类型的浓度检测图案。 密度检测图案在与图像载体的表面移动方向正交的方向上具有相互不同的长度。 转印单元将浓度检测图案转印到转印部件的表面上。 检测器检测在转印部件的表面上转印的浓度检测图案的图像浓度。 控制器基于由检测器获得的检测结果来计算浓度检测图案之间的图像浓度差，并且基于图像浓度差的值来校正用于转印调色剂图像的转印偏压。

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：US09519245B2

公开(公告)日：2016-12-13

申请号：US14712307

申请日：2015-05-14

申请人： Haruki Nagata ,  Ryo Hasegawa ,  Naoto Kochi ,  Atsushi Nagata ,  Takahiro Konishi

发明人： Haruki Nagata ,  Ryo Hasegawa ,  Naoto Kochi ,  Atsushi Nagata ,  Takahiro Konishi

IPC分类号： G03G15/16

CPC分类号： G03G15/1665 ,  G03G15/1605 ,  G03G2215/00738 ,  G03G2215/0193

摘要： An image forming apparatus includes an image bearer, a nip forming device, a contact-and-separation device, a thickness information retrieving device, and a controller. The contact-and-separation device moves the image bearer and the nip forming device to contact and separate from each other. The controller controls the contact-and-separation device based on information on a thickness of a recording medium obtained by the thickness information retrieving device such that in a case in which a thickness of a preceding recording medium and a thickness of a successive recording medium are different in continuous printing in which a plurality of recording media is printed out continuously, the contact-and-separation device adjusts a space between the image bearer and the nip forming device when the preceding recording medium exits the transfer nip to a preset size corresponding to the thickness of the successive recording medium that enters the transfer nip.

摘要翻译： 图像形成装置包括图像载体，压区形成装置，接触 - 分离装置，厚度信息检索装置和控制器。 接触分离装置使图像载体和辊隙形成装置相互接触和分离。 控制器基于由厚度信息检索装置获得的记录介质的厚度的信息来控制接触 - 分离装置，使得在先前记录介质的厚度和连续记录介质的厚度为 在连续打印多个记录介质的连续打印不同的情况下，当前一记录介质离开传送辊隙时，接触 - 分离装置调整图像载体和辊隙形成装置之间的空间，使其对应于 进入转印辊隙的连续记录介质的厚度。

公开(公告)号：US09046853B2

公开(公告)日：2015-06-02

申请号：US14209330

申请日：2014-03-13

申请人： Yuuji Wada ,  Atsushi Nagata

发明人： Yuuji Wada ,  Atsushi Nagata

IPC分类号： G03G15/08 ,  G03G15/00 ,  G03G15/01 ,  G03G15/16

CPC分类号： G03G15/553 ,  G03G15/0189 ,  G03G15/1605 ,  G03G15/1675 ,  G03G15/556

摘要： An image forming apparatus includes a primary transfer bias adjuster to adjust, in a second mode, a primary transfer bias by a correction amount in accordance with a degree of deterioration of a developing agent detected by a first developing agent condition detector so as to reduce a primary transfer current of the primary transfer bias upon transferring a toner image from a first image bearing member onto an intermediate transfer member, and to adjust, in a first mode, the primary transfer bias by a correction amount less than the correction amount in the second mode or not to adjust the primary transfer bias in accordance with the degree of deterioration of the developing agent detected by the first developing agent condition detector upon primarily transferring the toner image from the first image bearing member onto the intermediate transfer member.

摘要翻译： 一种图像形成装置包括一次转印偏压调节器，用于根据由第一显影剂状态检测器检测到的显影剂的劣化程度，在第二模式中将一次转印偏压调整为校正量，从而减少 在将调色剂图像从第一图像承载部件转印到中间转印部件上时，一次转印偏压的一次转印电流，并且以第一模式将一次转印偏压调整小于第二转印偏差中的校正量的校正量 模式或不是根据在将调色剂图像从第一图像承载部件转印到中间转印部件上时由第一显影剂条件检测器检测到的显影剂的劣化程度来调整一次转印偏压。