Patents by Inventor Ryuichi Yoshizawa
Ryuichi Yoshizawa has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10254699Abstract: An image forming apparatus includes image bearing members, an intermediate transfer member, a transfer unit, a control unit, and image forming units respectively corresponding to the image bearing members and each configured to form and transfer an image to the intermediate transfer member, which is then transferred to the conveyed recording material. Image patterns on the intermediate transfer member are detected for positional deviation detection. In a first mode, timing of image formation is determined using a first reference. In a second mode, timing of image formation is determined using a second reference. Based on timings at which formed image patterns are detected, the control unit, in the second mode, corrects timing of image formation performed by a second image forming unit or corrects timing at which the recording material is conveyed to the transfer unit.Type: GrantFiled: August 3, 2017Date of Patent: April 9, 2019Assignee: Canon Kabushiki KaishaInventors: Naoki Kanno, Ryuichi Yoshizawa
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Publication number: 20180046126Abstract: An image forming apparatus includes image bearing members, an intermediate transfer member, a transfer unit, a control unit, and image forming units respectively corresponding to the image bearing members and each configured to form and transfer an image to the intermediate transfer member, which is then transferred to the conveyed recording material. Image patterns on the intermediate transfer member are detected for positional deviation detection. In a first mode, timing of image formation is determined using a first reference. In a second mode, timing of image formation is determined using a second reference. Based on timings at which formed image patterns are detected, the control unit, in the second mode, corrects timing of image formation performed by a second image forming unit or corrects timing at which the recording material is conveyed to the transfer unit.Type: ApplicationFiled: August 3, 2017Publication date: February 15, 2018Inventors: Naoki Kanno, Ryuichi Yoshizawa
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Patent number: 9291976Abstract: An image forming system includes an option apparatus having a first conveying path; and an image forming apparatus having a second conveying path configured to be connected to the first conveying path. The image forming apparatus includes a sensor configured to detect a recording material conveyed on the second conveying path at a first speed; and a first controller configured to notify the option apparatus of a detection timing of the recording material. The option apparatus includes a second controller configured to determine whether the detection timing is different from a predetermined timing upon receiving a notification of the detection timing, and, if it is different, to determine a second speed based on the detection timing and the predetermined timing and change the conveying speed of the recording material from the first speed to the second speed.Type: GrantFiled: June 24, 2015Date of Patent: March 22, 2016Assignee: Canon Kabushiki KaishaInventors: Hiroki Hashii, Ryuichi Yoshizawa
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Publication number: 20160004203Abstract: An image forming system includes an option apparatus having a first conveying path; and an image forming apparatus having a second conveying path configured to be connected to the first conveying path. The image forming apparatus includes a sensor configured to detect a recording material conveyed on the second conveying path at a first speed; and a first controller configured to notify the option apparatus of a detection timing of the recording material. The option apparatus includes a second controller configured to determine whether the detection timing is different from a predetermined timing upon receiving a notification of the detection timing, and, if it is different, to determine a second speed based on the detection timing and the predetermined timing and change the conveying speed of the recording material from the first speed to the second speed.Type: ApplicationFiled: June 24, 2015Publication date: January 7, 2016Inventors: Hiroki Hashii, Ryuichi Yoshizawa
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Patent number: 8687988Abstract: A detection unit is disposed between a feeding unit and a secondary transfer unit on a conveyance path, and detects a transfer material that is conveyed. A control unit, if the detection unit cannot detect the transfer material by a predetermined timing after a feeding operation by a feeding unit, moves the secondary transfer unit away from a intermediate transfer member, causes the intermediate transfer member to continue rotating, and causes the feeding unit to retry feeding of the transfer material.Type: GrantFiled: May 20, 2010Date of Patent: April 1, 2014Assignee: Canon Kabushiki KaishaInventor: Ryuichi Yoshizawa
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Patent number: 8577277Abstract: An image forming apparatus includes a paper cassette feeding a recording material, an image forming unit forming an image on a photosensitive member, a primary transfer roller transferring the image onto an intermediate transfer belt, a secondary transfer roller transferring the image onto the recording material, and a sensor detecting the size of the recording material. The timing of starting feeding the recording material is earlier than the timing of starting forming the image. When image formation on the recording material is started, until the sensor detects the size of the recording material, a plurality of images are formed on the intermediate transfer belt at a first interval according to a predetermined recording material size, and after the sensor detects the size of the recording material, a plurality of images are formed on the intermediate transfer belt at a second interval according to the detected recording material size.Type: GrantFiled: September 26, 2011Date of Patent: November 5, 2013Assignee: Canon Kabushiki KaishaInventor: Ryuichi Yoshizawa
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Patent number: 8544844Abstract: An image forming system including an image forming apparatus and a sheet feeding apparatus. The system includes: a first conveying unit conveying to the image forming apparatus a recording material; a second conveying unit conveying to an image forming unit of the image forming apparatus the recording material; a detector detecting a recording material type while the second conveying unit halts conveying the recording material; a first controller, based on detection by the detector, determining a speed for conveying the recording material to the image forming unit, and conveying the recording material at the conveying speed; and a second controller controlling recording material conveying speeds of the first conveying unit. Before the recording material reaches the second conveying unit, the second controller maintains a first conveying speed, and after the recording material reaches the second convey unit, maintains a second conveying speed determined by the first control unit.Type: GrantFiled: August 24, 2010Date of Patent: October 1, 2013Assignee: Canon Kabushiki KaishaInventors: Ryuichi Yoshizawa, Atsuya Takahashi, Akihiro Nakamura, Tadashi Okanishi, Kazuhisa Maruyama, Kaoru Sato
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Patent number: 8531695Abstract: There is provided an image forming system that automatically discharges paper sheets other than poorly fed ones without making an emergency stop, even when poor paper feeding is caused due to a paper jam or the like. At paper feeding, information showing poor paper feeding is transmitted when the poor paper feeding is detected in supplying the paper sheets. At image forming, a determination is made whether the paper conveyance in forming the image is continued or stopped when an instruction, based on the information showing the poor paper feeding. At paper discharging, a determination is made whether the paper conveyance in discharging the paper sheets is continued or stopped when an instruction, based on the information showing the defective conveyance.Type: GrantFiled: January 27, 2011Date of Patent: September 10, 2013Assignee: Canon Kabushiki KaishaInventors: Akihiro Nakamura, Atsuya Takahashi, Kaoru Sato, Ryuichi Yoshizawa, Kazuhisa Maruyama
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Publication number: 20120014730Abstract: An image forming apparatus includes a paper cassette feeding a recording material, an image forming unit forming an image on a photosensitive member, a primary transfer roller transferring the image onto an intermediate transfer belt, a secondary transfer roller transferring the image onto the recording material, and a sensor detecting the size of the recording material. The timing of starting feeding the recording material is earlier than the timing of starting forming the image. When image formation on the recording material is started, until the sensor detects the size of the recording material, a plurality of images are formed on the intermediate transfer belt at a first interval according to a predetermined recording material size, and after the sensor detects the size of the recording material, a plurality of images are formed on the intermediate transfer belt at a second interval according to the detected recording material size.Type: ApplicationFiled: September 26, 2011Publication date: January 19, 2012Applicant: CANON KABUSHIKI KAISHAInventor: Ryuichi Yoshizawa
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Patent number: 8060003Abstract: An image forming apparatus includes a paper cassette feeding a recording material, an image forming unit forming an image on a photosensitive member, a primary transfer roller transferring the image onto an intermediate transfer belt, a secondary transfer roller transferring the image onto the recording material, and a sensor detecting the size of the recording material. The timing of starting feeding the recording material is later than the timing of starting forming the image. When image formation on the recording material is started, until the sensor detects the size of the recording material, a plurality of images are formed on the intermediate transfer belt at a first interval according to a predetermined recording material size, and after the sensor detects the size of the recording material, a plurality of images are formed on the intermediate transfer belt at a second interval according to the detected recording material size.Type: GrantFiled: October 16, 2007Date of Patent: November 15, 2011Assignee: Canon Kabushiki KaishaInventor: Ryuichi Yoshizawa
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Publication number: 20110274454Abstract: An image forming apparatus to which a paper handling unit is connected thereto is provided. The image forming apparatus detects the size of a sheet in a direction in which the sheet is conveyed for image formation. The image forming apparatus outputs sheet size mismatch information indicating that the size of the sheet does not match a predetermined size to the paper handling unit before a size detecting operation thereof has been completed detecting the trailing edge of the sheet is greater than the predetermined size.Type: ApplicationFiled: July 19, 2011Publication date: November 10, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Eiichiro Teshima, Tatsuto Tachibana, Ryuichi Yoshizawa, Kazuhisa Maruyama, Atsuya Takahashi, Akihiro Nakamura, Kaoru Sato
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Patent number: 8000616Abstract: An image forming apparatus to which a paper handling unit is connected thereto is provided. The image forming apparatus detects the size of a sheet in a direction in which the sheet is conveyed for image formation. The image forming apparatus outputs sheet size mismatch information indicating that the size of the sheet does not match a predetermined size to the paper handling unit before a size detecting operation thereof has been completed detecting the trailing edge of the sheet is greater than the predetermined size.Type: GrantFiled: June 7, 2007Date of Patent: August 16, 2011Assignee: Canon Kabushiki KaishaInventors: Eiichiro Teshima, Tatsuto Tachibana, Ryuichi Yoshizawa, Kazuhisa Maruyama, Atsuya Takahashi, Akihiro Nakamura, Kaoru Sato
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Publication number: 20110116121Abstract: There is provided an image forming system that automatically discharges paper sheets other than poorly fed ones without making an emergency stop, even when poor paper feeding is caused due to a paper jam or the like. At paper feeding, information showing poor paper feeding is transmitted when the poor paper feeding is detected in supplying the paper sheets. At image forming, a determination is made whether the paper conveyance in forming the image is continued or stopped when an instruction, based on the information showing the poor paper feeding. At paper discharging, a determination is made whether the paper conveyance in discharging the paper sheets is continued or stopped when an instruction, based on the information showing the defective conveyance.Type: ApplicationFiled: January 27, 2011Publication date: May 19, 2011Applicant: CANON KABUSHIKI KAISHAInventors: Akihiro NAKAMURA, Atsuya TAKAHASHI, Kaoru SATO, Ryuichi YOSHIZAWA, Kazuhisa MARUYAMA
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Patent number: 7916318Abstract: There is provided an image forming system that automatically discharges paper sheets other than poorly fed ones without making an emergency stop, even when poor paper feeding is caused due to a paper jam or the like. At paper feeding, information showing poor paper feeding is transmitted when the poor paper feeding is detected in supplying the paper sheets. At image forming, a determination is made whether the paper conveyance in forming the image is continued or stopped when an instruction, based on the information showing the poor paper feeding. At paper discharging, a determination is made whether the paper conveyance in discharging the paper sheets is continued or stopped when an instruction, based on the information showing the defective conveyance.Type: GrantFiled: May 8, 2006Date of Patent: March 29, 2011Assignee: Canon Kabushiki KaishaInventors: Akihiro Nakamura, Atsuya Takahashi, Kaoru Sato, Ryuichi Yoshizawa, Kazuhisa Maruyama
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Publication number: 20100322651Abstract: A detection unit is disposed between a feeding unit and a secondary transfer unit on a conveyance path, and detects a transfer material that is conveyed. A control unit, if the detection unit cannot detect the transfer material by a predetermined timing after a feeding operation by a feeding unit, moves the secondary transfer unit away from a intermediate transfer member, causes the intermediate transfer member to continue rotating, and causes the feeding unit to retry feeding the transfer material.Type: ApplicationFiled: May 20, 2010Publication date: December 23, 2010Applicant: CANON KABUSHIKI KAISHAInventor: Ryuichi Yoshizawa
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Publication number: 20100314824Abstract: An image forming system including an image forming apparatus and a sheet feeding apparatus. The system includes: a first conveying unit conveying to the image forming apparatus a recording material; a second conveying unit conveying to an image forming unit of the image forming apparatus the recording material; a detector detecting a recording material type while the second conveying unit halts conveying the recording material; a first controller, based on detection by the detector, determining a speed for conveying the recording material to the image forming unit, and conveying the recording material at the conveying speed; and a second controller controlling recording material conveying speeds of the first conveying unit. Before the recording material reaches the second conveying unit, the second controller maintains a first conveying speed, and after the recording material reaches the second convey unit, maintains a second conveying speed determined by the first control unit.Type: ApplicationFiled: August 24, 2010Publication date: December 16, 2010Applicant: CANON KABUSHIKI KAISHAInventors: Ryuichi Yoshizawa, Atsuya Takahashi, Akihiro Nakamura, Tadashi Okanishi, Kazuhisa Maruyama, Kaoru Sato
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Patent number: 7802791Abstract: An image forming system including an image forming apparatus and a sheet feeding apparatus. The system includes: a first conveying unit conveying to the image forming apparatus a recording material; a second conveying unit conveying to an image forming unit of the image forming apparatus the recording material; a detector detecting a recording material type while the second conveying unit halts conveying the recording material; a first controller, based on detection by the detector, determining a speed for conveying the recording material to the image forming unit, and conveying the recording material at the conveying speed; and a second controller controlling recording material conveying speeds of the first conveying unit. Before the recording material reaches the second conveying unit, the second controller maintains a first conveying speed, and after the recording material reaches the second convey unit, maintains a second conveying speed determined by the first control unit.Type: GrantFiled: April 21, 2006Date of Patent: September 28, 2010Assignee: Canon Kabushiki KaishaInventors: Ryuichi Yoshizawa, Atsuya Takahashi, Akihiro Nakamura, Tadashi Okanishi, Kazuhisa Maruyama, Kaoru Sato
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Patent number: 7729005Abstract: An engine control section detects that a sheet in a cassette is exhausted during duplex image formation. If a sheet with its first surface being printed is on standby in a duplexer, an image formation timing signal is output for a first surface of a sheet not fed because of a paper-out. Subsequently, an image formation timing signal is output for a second surface of the sheet that is in the duplexer and has its first surface printed. After completing the image formation of the second surface of the sheet, the operation is halted.Type: GrantFiled: December 7, 2005Date of Patent: June 1, 2010Assignee: Canon Kabushiki KaishaInventors: Tadashi Okanishi, Kazuhisa Maruyama, Ryuichi Yoshizawa, Akihiro Nakamura, Atsuya Takahashi
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Patent number: 7595912Abstract: At step S301, since none of conveyance sensors 114, 116 and 121 detect residual paper, a CPU 203 notifies a CPU 201 that it is in a residual paper check start instruction waiting mode. At step S302, since a conveying path sensor 111 in an optional paper feed unit 101 does not detect residual paper, the CPU 202 notifies the CPU 201 that it is in a residual paper check start instruction waiting mode. At step S303, since an inlet sensor 122 of an optional paper output unit 103 does not detect residual paper, the CPU 204 notifies the CPU 201 that it is in a residual paper check start instruction waiting mode. After confirming that all the units are in the waiting mode, the CPU 201 issues a residual paper check start instruction to all the units simultaneously to improve usability by reducing initializing time.Type: GrantFiled: May 8, 2006Date of Patent: September 29, 2009Assignee: Canon Kabusihiki KaishaInventors: Atsuya Takahashi, Akihiro Nakamura, Kaoru Sato, Kazuhisa Maruyama, Ryuichi Yoshizawa
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Patent number: 7551306Abstract: In an image forming apparatus constructing a color table corresponding to a kind of recording material, provided is an image forming apparatus which includes an engine controlling unit for outputting a vertical synchronizing signal in consideration of a time required for a controller to construct the color table. The engine controlling unit and the controller are included. The engine controlling unit notifies the controller of an assumed kind of recording material and the kind of recording material actually detected. When the two are not identical, the controller reconstructs the color table corresponding to the detected kind of recording material. The engine controlling unit does not output, to the controller, the vertical synchronizing signal for outputting image data during the time when the controller constructs the color table.Type: GrantFiled: July 24, 2006Date of Patent: June 23, 2009Assignee: Canon Kabushiki KaishaInventors: Ryuichi Yoshizawa, Atsuya Takahashi