Patents by Inventor Tadashi Iwakawa
Tadashi Iwakawa 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: 11947300Abstract: An image forming system includes an image forming apparatus, a cutting apparatus, and a controller. The cutting apparatus includes a conveyance path, a first cutting unit configured to cut, at a cutting position with respect to a conveyance direction of the sheet on the conveyance path, the sheet in a width direction perpendicularly intersecting with the conveyance direction, and a second cutting unit configured to cut, at a cutting position with respect to the width direction, the sheet in the conveyance direction. The controller is configured to control the cutting apparatus such that, in a case where the sheet is cut neither with the first cutting unit nor with the second cutting unit, the sheet is conveyed through the conveyance path with the first cutting unit and the second cutting unit retreated not to contact with the sheet passing through the conveyance path.Type: GrantFiled: June 30, 2022Date of Patent: April 2, 2024Assignee: Canon Kabushiki KaishaInventors: Atsushi Takada, Tadashi Iwakawa, Rin Ishikawa
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Publication number: 20220334524Abstract: An image forming system includes an image forming apparatus, a cutting apparatus, and a controller. The cutting apparatus includes a conveyance path, a first cutting unit configured to cut, at a cutting position with respect to a conveyance direction of the sheet on the conveyance path, the sheet in a width direction perpendicularly intersecting with the conveyance direction, and a second cutting unit configured to cut, at a cutting position with respect to the width direction, the sheet in the conveyance direction. The controller is configured to control the cutting apparatus such that, in a case where the sheet is cut neither with the first cutting unit nor with the second cutting unit, the sheet is conveyed through the conveyance path with the first cutting unit and the second cutting unit retreated not to contact with the sheet passing through the conveyance path.Type: ApplicationFiled: June 30, 2022Publication date: October 20, 2022Inventors: Atsushi Takada, Tadashi Iwakawa, Rin Ishikawa
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Patent number: 11409221Abstract: An image forming system includes an image forming apparatus, a cutting apparatus, and a controller. The cutting apparatus includes a conveyance path, a first cutting unit configured to cut, at a cutting position with respect to a conveyance direction of the sheet on the conveyance path, the sheet in a width direction perpendicularly intersecting with the conveyance direction, and a second cutting unit configured to cut, at a cutting position with respect to the width direction, the sheet in the conveyance direction. The controller is configured to control the cutting apparatus such that, in a case where the sheet is cut neither with the first cutting unit nor with the second cutting unit, the sheet is conveyed through the conveyance path with the first cutting unit and the second cutting unit retreated not to contact with the sheet passing through the conveyance path.Type: GrantFiled: June 2, 2020Date of Patent: August 9, 2022Assignee: Canon Kabushiki KaishaInventors: Atsushi Takada, Tadashi Iwakawa, Rin Ishikawa
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Publication number: 20220146975Abstract: An image forming system includes a first unit, a second unit, and a third unit. The first unit includes an image forming unit that forms an image on a sheet fed from a feed unit. The second unit is arranged on a downstream side of the first unit and includes a cutting unit that cuts the sheet on which the image is formed by the image forming unit. The third unit is arranged on a downstream side of the second unit and includes a post-processing unit that post-processes the sheet cut by the cutting unit. A sheet cut to have a first size is discharged to a first discharge unit provided in the second unit. A sheet cut to have a second size larger than the first size is discharged to a second discharge unit provided in the third unit.Type: ApplicationFiled: November 4, 2021Publication date: May 12, 2022Inventors: Rin Ishikawa, Atsushi Takada, Tadashi Iwakawa
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Publication number: 20200387100Abstract: An image forming system includes an image forming apparatus, a cutting apparatus, and a controller. The cutting apparatus includes a conveyance path, a first cutting unit configured to cut, at a cutting position with respect to a conveyance direction of the sheet on the conveyance path, the sheet in a width direction perpendicularly intersecting with the conveyance direction, and a second cutting unit configured to cut, at a cutting position with respect to the width direction, the sheet in the conveyance direction. The controller is configured to control the cutting apparatus such that, in a case where the sheet is cut neither with the first cutting unit nor with the second cutting unit, the sheet is conveyed through the conveyance path with the first cutting unit and the second cutting unit retreated not to contact with the sheet passing through the conveyance path.Type: ApplicationFiled: June 2, 2020Publication date: December 10, 2020Inventors: Atsushi Takada, Tadashi Iwakawa, Rin Ishikawa
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Patent number: 10452015Abstract: When a mechanism enters a first state, an intermediate transfer member separates from a second photosensitive member. When the mechanism enters a second state, the intermediate transfer member contacts the second photosensitive member. When a first monochrome image is formed on a sheet of a first type by using toner of a first color, the mechanism enters the first state. When a second monochrome image is formed on a sheet of a second type by using toner of the first color, the mechanism enters the second state. A rotation speed of the second photosensitive member for forming the second monochrome image on the sheet of the second type is controlled to a predetermined rotation speed. The predetermined rotation speed is slower than a rotation speed of the second photosensitive member for forming the second image.Type: GrantFiled: October 11, 2018Date of Patent: October 22, 2019Assignee: Canon Kabushiki KaishaInventors: Rin Ishikawa, Tadashi Iwakawa, Koichi Taniguchi, Akira Hamano
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Patent number: 10416605Abstract: There is provided a cleaning device in which both sidewalls of a scraper holding unit are formed so that a center line between both the sidewalls of the scraper holding unit is directed substantially toward the center of a fur brush.Type: GrantFiled: July 10, 2017Date of Patent: September 17, 2019Assignee: Canon Kabushiki KaishaInventor: Tadashi Iwakawa
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Patent number: 10295950Abstract: A cleaning device includes a cleaning member, a container, a feeding screw including a blade for feeding toner inside the container toward an outside of the container, and a loosening member, stretching along a rotation axis direction of the feeding screw, for loosening toner on a container wall surface provided around the feeding screw by being swung about a rotational axis along the rotation axis direction in a direction crossing the rotation axis direction, and the loosening member includes a contact portion for rotating the loosening member in a first direction with rotation of the feeding screw in contact with the blade when the feeding screw is in a predetermined phase range and includes an urging portion for imparting, to the loosening member, a force for rotating the loosening member in a second direction opposite to the first direction.Type: GrantFiled: August 28, 2018Date of Patent: May 21, 2019Assignee: Canon Kabushiki KaishaInventors: Tadashi Iwakawa, Masato Yuasa, Keita Shigihara
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Publication number: 20190064707Abstract: An image forming apparatus includes a photosensitive drum, a driving source for driving the photosensitive drum, a charging roller, a cleaning roller for cleaning the charging roller, a bearing member having an space which allows the charging roller to be moved to a first position in which the charging roller is in contact with the cleaning roller and the photosensitive drum and a second position in which the charging roller is separated from the cleaning roller and is in contact with the photosensitive drum, and a biasing member which biases the bearing member.Type: ApplicationFiled: August 21, 2018Publication date: February 28, 2019Inventors: Michihiro Yoshida, Takayuki Suzuki, Tadashi Iwakawa
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Publication number: 20190041783Abstract: When a mechanism enters a first state, an intermediate transfer member separates from a second photosensitive member. When the mechanism enters a second state, the intermediate transfer member contacts the second photosensitive member. When a first monochrome image is formed on a sheet of a first type by using toner of a first color, the mechanism enters the first state. When a second monochrome image is formed on a sheet of a second type by using toner of the first color, the mechanism enters the second state. A rotation speed of the second photosensitive member for forming the second monochrome image on the sheet of the second type is controlled to a predetermined rotation speed. The predetermined rotation speed is slower than a rotation speed of the second photosensitive member for forming the second image.Type: ApplicationFiled: October 11, 2018Publication date: February 7, 2019Inventors: Rin Ishikawa, Tadashi Iwakawa, Koichi Taniguchi, Akira Hamano
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Publication number: 20180364634Abstract: A cleaning device includes a cleaning member, a container, a feeding screw including a blade for feeding toner inside the container toward an outside of the container, and a loosening member, stretching along a rotation axis direction of the feeding screw, for loosening toner on a container wall surface provided around the feeding screw by being swung about a rotational axis along the rotation axis direction in a direction crossing the rotation axis direction, and the loosening member includes a contact portion for rotating the loosening member in a first direction with rotation of the feeding screw in contact with the blade when the feeding screw is in a predetermined phase range and includes an urging portion for imparting, to the loosening member, a force for rotating the loosening member in a second direction opposite to the first direction.Type: ApplicationFiled: August 28, 2018Publication date: December 20, 2018Inventors: Tadashi Iwakawa, Masato Yuasa, Keita Shigihara
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Patent number: 10146163Abstract: When a mechanism enters a first state, an intermediate transfer member separates from a second photosensitive member. When the mechanism enters a second state, the intermediate transfer member contacts the second photosensitive member. When a first monochrome image is formed on a sheet of a first type by using toner of a first color, the mechanism enters the first state. When a second monochrome image is formed on a sheet of a second type by using toner of the first color, the mechanism enters the second state. A rotation speed of the second photosensitive member for forming the second monochrome image on the sheet of the second type is controlled to a predetermined rotation speed. The predetermined rotation speed is slower than a rotation speed of the second photosensitive member for forming the second image.Type: GrantFiled: June 20, 2017Date of Patent: December 4, 2018Assignee: Canon Kabushiki KaishaInventors: Rin Ishikawa, Tadashi Iwakawa, Koichi Taniguchi, Akira Hamano
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Publication number: 20180017931Abstract: There is provided a cleaning device in which both sidewalls of a scraper holding unit are formed so that a center line between both the sidewalls of the scraper holding unit is directed substantially toward the center of a fur brush.Type: ApplicationFiled: July 10, 2017Publication date: January 18, 2018Inventor: Tadashi Iwakawa
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Publication number: 20180017915Abstract: When a mechanism enters a first state, an intermediate transfer member separates from a second photosensitive member. When the mechanism enters a second state, the intermediate transfer member contacts the second photosensitive member. When a first monochrome image is formed on a sheet of a first type by using toner of a first color, the mechanism enters the first state. When a second monochrome image is formed on a sheet of a second type by using toner of the first color, the mechanism enters the second state. A rotation speed of the second photosensitive member for forming the second monochrome image on the sheet of the second type is controlled to a predetermined rotation speed. The predetermined rotation speed is slower than a rotation speed of the second photosensitive member for forming the second image.Type: ApplicationFiled: June 20, 2017Publication date: January 18, 2018Inventors: Rin Ishikawa, Tadashi Iwakawa, Koichi Taniguchi, Akira Hamano
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Patent number: 9829833Abstract: An image forming apparatus includes an image bearing member, a toner image forming unit, an intermediary transfer member, a first driving source, a second driving portion, a speed instruction value changing portion, an executing portion for executing an operation in a detecting mode in a first detection period in a first state and in a second detection period in a second state larger in frictional force than in the first state, and a setting portion. In each of the first and second detection periods, the speed instruction value of the second driving source is set at a fixed value and the speed instruction value of the first driving source is successively changed to different values, and the setting portion sets the speed instruction value of the first driving source used during the image formation on the basis of a detection result in the detecting mode.Type: GrantFiled: March 1, 2016Date of Patent: November 28, 2017Assignee: Canon Kabushiki KaishaInventors: Tadashi Iwakawa, Koichi Taniguchi, Takuya Matsumura
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Patent number: 9581927Abstract: An image forming apparatus includes a primary transfer unit, a secondary transfer unit, a registration roller pair placed upstream of the secondary transfer unit in a sheet transport direction, and a drive unit driving the registration roller pair. In addition, a detection sensor unit is placed on a sheet transport path downstream of the secondary transfer unit and detects a sheet transported after a toner image is secondary transferred by the secondary transfer unit, and a transport unit transports the sheet after the secondary transfer.Type: GrantFiled: February 1, 2012Date of Patent: February 28, 2017Assignee: CANON KABUSHIKI KAISHAInventors: Tadashi Iwakawa, Keitaro Taoka
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Publication number: 20160259275Abstract: An image forming apparatus includes an image bearing member, a toner image forming unit, an intermediary transfer member, a first driving source, a second driving portion, a speed instruction value changing portion, an executing portion for executing an operation in a detecting mode in a first detection period in a first state and in a second detection period in a second state larger in frictional force than in the first state, and a setting portion. In each of the first and second detection periods, the speed instruction value of the second driving source is set at a fixed value and the speed instruction value of the first driving source is successively changed to different values, and the setting portion sets the speed instruction value of the first driving source used during the image formation on the basis of a detection result in the detecting mode.Type: ApplicationFiled: March 1, 2016Publication date: September 8, 2016Inventors: Tadashi Iwakawa, Koichi Taniguchi, Takuya Matsumura
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Patent number: 9423760Abstract: A developer accommodating container, comprising: an accommodating portion provided with a falling inlet; an optical portion which forms a light path inside the accommodating portion; a space portion which is provided in the middle of the light path and capable of accumulating the developer accommodated in the accommodating portion; a casing portion which has a cover portion covering the space portion not to flow in the developer to the space portion except a surface of the opposite side which is formed the falling inlet seeing from the space portion, and that has a introducing inlet which can introduce the developer to the space portion from upper position than at least a bottom of the space portion, and that has a discharge outlet which can discharge the developer at a lower position than the space portion.Type: GrantFiled: June 24, 2013Date of Patent: August 23, 2016Assignee: Canon Kabushiki KaishaInventors: Masaki Kakitani, Koichi Taniguchi, Tadashi Iwakawa
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Patent number: 9244380Abstract: An image forming apparatus is capable of executing, in non-image formation, for example, in a sheet-to-sheet interval, a developer bearing member stop mode in which the developer conveyance by a development sleeve is stopped. For example, the apparatus turns off primary transfer bias in the sheet-to-sheet interval. Even if fogging toner is no longer supplied after the development sleeve drive is stopped, the apparatus can reduce frictional force variation between the photosensitive drum and the intermediate transfer belt to prevent speed variation of the photosensitive drum or the intermediate transfer belt, thus reducing the possibility of image unevenness and out of color registration.Type: GrantFiled: August 6, 2013Date of Patent: January 26, 2016Assignee: Canon Kabushiki KaishaInventors: Yoshiro Tsukada, Kengo Sato, Tadashi Iwakawa
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Patent number: 8983361Abstract: An image forming apparatus has an image bearing member bearing a toner image, a transfer part transferring the toner image from the image bearing member onto a sheet, a separation/feeding part separating and feeding sheets stacked on a sheet stacking member, and a transport part transporting the sheet fed by the separation/feeding part to the transfer part, in which a transporting operation of the transport part is changed according to a length of the sheet to be transported in a transport direction of the sheet. A control is configured to control so that a timing to decelerate to the transfer speed by the transport part with respect to a start of image formation is changed according to a length of the transported sheet in a transport direction of the sheet.Type: GrantFiled: March 13, 2013Date of Patent: March 17, 2015Assignee: Canon Kabushiki KaishaInventor: Tadashi Iwakawa