Patents by Inventor Hironobu Takasawa
Hironobu Takasawa 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: 7275481Abstract: A printer of the present invention includes a timing belt passed over drive pulleys, each of which is mounted on a particular print drum, via phase adjusting means and deflection pulleys or rotary members. The deflection pulleys are rotatable in contact with the rear surface of the timing belt. The timing belt has its rear surface ground to have uniform thickness. The printer is free from the deviation of relative phase between the rotary members and offset ghosts ascribable to the irregular thickness of the timing belt, while preserving the low-cost configuration of timing belt connection.Type: GrantFiled: February 28, 2001Date of Patent: October 2, 2007Assignee: Tohoku Ricoh Co., Ltd.Inventors: Keiichi Chiba, Hironobu Takasawa
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Patent number: 6820543Abstract: A multicolor printing method using a plurality of ink drums each being loaded with a respective master and a system therefore are disclosed. A plurality of removable ink drums replaceable with each other are fed with respective masters by fixed master feeding devices smaller in number than ink drums via the replacement of the drums and are used for printing. The method and system of the present invention are low cost and enhance downsizing and accurate registration between the masters.Type: GrantFiled: September 8, 2003Date of Patent: November 23, 2004Assignee: Tohoku Ricoh Co., Ltd.Inventors: Hironobu Takasawa, Manabu Wakamatsu
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Patent number: 6715412Abstract: A printer capable of printing a multicolor image with a single pass of a paper or similar recording medium includes a plurality of print drums. Drum drive gears each are mounted on a particular print drum such that the print drum is replaceable. The print drums are interlocked to each other by rotatable members including relay gears meshing with the drum drive gears, timing pulleys fixed to the relay gears, a timing belt, and pulleys for adjustment. Each rotatable member has teeth the number of which is selected such that the number of rotations of the rotatable member to occur in a single period of the print drums is an integral multiple of the number of rotations of the print drums.Type: GrantFiled: April 9, 2002Date of Patent: April 6, 2004Assignee: Tohoku Ricoh Co., Ltd.Inventors: Keiichi Chiba, Hironobu Takasawa
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Publication number: 20040045457Abstract: A multicolor printing method using a plurality of ink drums each being loaded with a respective master and a system therefore are disclosed. A plurality of removable ink drums replaceable with each other are fed with respective masters by fixed master feeding devices smaller in number than ink drums via the replacement of the drums and are used for printing. The method and system of the present invention are low cost and enhance downsizing and accurate registration between the masters.Type: ApplicationFiled: September 8, 2003Publication date: March 11, 2004Inventors: Hironobu Takasawa, Manabu Wakamatsu
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Patent number: 6651553Abstract: A printer capable of printing a multicolor image with a single pass of a paper or similar recording medium includes a plurality of print drums. Drum drive gears each are mounted on a particular print drum such that the print drum is replaceable. The print drums are interlocked to each other by rotatable members including relay gears meshing with the drum drive gears, timing pulleys fixed to the relay gears, a timing belt, and pulleys for adjustment. Each rotatable member has teeth the number of which is selected such that the number of rotations of the rotatable member to occur in a single period of the print drums is an integral multiple of the number of rotations of the print drums.Type: GrantFiled: April 9, 2002Date of Patent: November 25, 2003Assignee: Tohoku Ricoh Co., Ltd.Inventors: Keiichi Chiba, Hironobu Takasawa
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Patent number: 6647873Abstract: A printer capable of printing a multicolor image with a single pass of a paper or similar recording medium includes a plurality of print drums. Drum drive gears each are mounted on a particular print drum such that the print drum is replaceable. The print drums are interlocked to each other by rotatable members including relay gears meshing with the drum drive gears, timing pulleys fixed to the relay gears, a timing belt, and pulleys for adjustment. Each rotatable member has teeth the number of which is selected such that the number of rotations of the rotatable member to occur in a single period of the print drums is an integral multiple of the number of rotations of the print drums.Type: GrantFiled: April 9, 2002Date of Patent: November 18, 2003Assignee: Tohoku Ricoh Co., Ltd.Inventors: Keiichi Chiba, Hironobu Takasawa
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Patent number: 6644189Abstract: A multicolor printing method and system including a master making device having plurality of removable ink drums replaceable with each other and a printing device. The plurality of removable ink drums are fed with respective masters to be used for printing, by fixed master feeding devices smaller in number than the removable ink drums. The removable ink drums fed with respective masters are then used by the printing device for printing onto paper. The method and system provides multicolor printing with lower cost, reduced size and accurate registration between the respective masters, as compared to conventional methods and systems.Type: GrantFiled: April 11, 2002Date of Patent: November 11, 2003Assignee: Tohoku Ricoh Co., Ltd.Inventors: Hironobu Takasawa, Manabu Wakamatsu
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Patent number: 6644183Abstract: A multicolor printing method and system including a master making device having plurality of removable ink drums replaceable with each other and a printing device. The plurality of removable ink drums are fed with respective masters to be used for printing, by fixed master feeding devices smaller in number than the removable ink drums. The removable ink drums fed with respective masters are then used by the printing device for printing onto paper. The method and system provides multicolor printing with lower cost, reduced size and accurate registration between the respective masters, as compared to conventional methods and systems.Type: GrantFiled: April 11, 2002Date of Patent: November 11, 2003Assignee: Tohoku Ricoh Co., Ltd.Inventors: Hironobu Takasawa, Manabu Wakamatsu
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Publication number: 20030205151Abstract: A printer of the present invention includes drive pulleys each being mounted on a particular print drum.Type: ApplicationFiled: June 4, 2003Publication date: November 6, 2003Inventors: Keiichi Chiba, Hironobu Takasawa
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Patent number: 6604459Abstract: A printer including drive pulleys each being mounted on a particular print drum. Each of the print drums has a pitch circle diameter and a number of teeth related to each other as: d/z<1 where d denotes the pitch circle diameter (mm) and z denotes the number of teeth.Type: GrantFiled: March 1, 2001Date of Patent: August 12, 2003Assignee: Tohoku Ricoh Co., Ltd.Inventors: Keiichi Chiba, Hironobu Takasawa
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Patent number: 6564707Abstract: A multicolor printing method and system including a master making device having plurality of removable ink drums replaceable with each other and a printing device. The plurality of removable ink drums are fed with respective masters to be used for printing, by fixed master feeding devices smaller in number than the removable ink drums. The removable ink drums fed with respective masters are then used by the printing device for printing onto paper. The method and system provides multicolor printing with lower cost, reduced size and accurate registration between the respective masters, as compared to conventional methods and systems.Type: GrantFiled: April 11, 2002Date of Patent: May 20, 2003Assignee: Tohoku Ricoh Co., Ltd.Inventors: Hironobu Takasawa, Manabu Wakamatsu
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Publication number: 20020117062Abstract: A multicolor printing method using a plurality of ink drums each being loaded with a respective master and a system therefore are disclosed. A plurality of removable ink drums replaceable with each other are fed with respective masters by fixed master feeding devices smaller in number than ink drums via the replacement of the drums and are used for printing. The method and system of the present invention are low cost and enhance downsizing and accurate registration between the masters.Type: ApplicationFiled: April 11, 2002Publication date: August 29, 2002Inventors: Hironobu Takasawa, Manabu Wakamatsu
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Publication number: 20020117061Abstract: A printer capable of printing a multicolor image with a single pass of a paper or similar recording medium includes a plurality of print drums. Drum drive gears each are mounted on a particular print drum such that the print drum is replaceable. The print drums are interlocked to each other by rotatable members including relay gears meshing with the drum drive gears, timing pulleys fixed to the relay gears, a timing belt, and pulleys for adjustment. Each rotatable member has teeth the number of which is selected such that the number of rotations of the rotatable member to occur in a single period of the print drums is an integral multiple of the number of rotations of the print drums.Type: ApplicationFiled: April 9, 2002Publication date: August 29, 2002Inventors: Keiichi Chiba, Hironobu Takasawa
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Publication number: 20020112620Abstract: A printer capable of printing a multicolor image with a single pass of a paper or similar recording medium includes a plurality of print drums. Drum drive gears each are mounted on a particular print drum such that the print drum is replaceable. The print drums are interlocked to each other by rotatable members including relay gears meshing with the drum drive gears, timing pulleys fixed to the relay gears, a timing belt, and pulleys for adjustment. Each rotatable member has teeth the number of which is selected such that the number of rotations of the rotatable member to occur in a single period of the print drums is an integral multiple of the number of rotations of the print drums.Type: ApplicationFiled: April 9, 2002Publication date: August 22, 2002Inventors: Keiichi Chiba, Hironobu Takasawa
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Publication number: 20020108512Abstract: A printer capable of printing a multicolor image with a single pass of a paper or similar recording medium includes a plurality of print drums. Drum drive gears each are mounted on a particular print drum such that the print drum is replaceable. The print drums are interlocked to each other by rotatable members including relay gears meshing with the drum drive gears, timing pulleys fixed to the relay gears, a timing belt, and pulleys for adjustment. Each rotatable member has teeth the number of which is selected such that the number of rotations of the rotatable member to occur in a single period of the print drums is an integral multiple of the number of rotations of the print drums.Type: ApplicationFiled: April 9, 2002Publication date: August 15, 2002Inventors: Keiichi Chiba, Hironobu Takasawa
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Publication number: 20020108514Abstract: A multicolor printing method using a plurality of ink drums each being loaded with a respective master and a system therefore are disclosed. A plurality of removable ink drums replaceable with each other are fed with respective masters by fixed master feeding devices smaller in number than ink drums via the replacement of the drums and are used for printing. The method and system of the present invention are low cost and enhance downsizing and accurate registration between the masters.Type: ApplicationFiled: April 11, 2002Publication date: August 15, 2002Inventors: Hironobu Takasawa, Manabu Wakamatsu
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Publication number: 20020108511Abstract: A multicolor printing method using a plurality of ink drums each being loaded with a respective master and a system therefore are disclosed. A plurality of removable ink drums replaceable with each other are fed with respective masters by fixed master feeding devices smaller in number than ink drums via the replacement of the drums and are used for printing. The method and system of the present invention are low cost and enhance downsizing and accurate registration between the masters.Type: ApplicationFiled: April 11, 2002Publication date: August 15, 2002Inventors: Hironobu Takasawa, Manabu Wakamatsu
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Publication number: 20020092431Abstract: A multicolor printing method using a plurality of ink drums each being loaded with a respective master and a system therefore are disclosed. A plurality of removable ink drums replaceable with each other are fed with respective masters by fixed master feeding devices smaller in number than ink drums via the replacement of the drums and are used for printing. The method and system of the present invention are low cost and enhance downsizing and accurate registration between the masters.Type: ApplicationFiled: March 19, 2002Publication date: July 18, 2002Applicant: Tohoku Ricoh Co., Ltd.Inventors: Hironobu Takasawa, Manabu Wakamatsu
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Patent number: 6382094Abstract: A printer capable of printing a multicolor image with a single pass of a paper or similar recording medium includes a plurality of print drums. Drum drive gears each are mounted on a particular print drum such that the print drum is replaceable. The print drums are interlocked to each other by rotatable members including relay gears meshing with the drum drive gears, timing pulleys fixed to the relay gears, a timing belt, and pulleys for adjustment. Each rotatable member has teeth the number of which is selected such that the number of rotations of the rotatable member to occur in a single period of the print drums is an integral multiple of the number of rotations of the print drums.Type: GrantFiled: March 21, 2000Date of Patent: May 7, 2002Assignee: Tohoku Ricoh Co., Ltd.Inventors: Keiichi Chiba, Hironobu Takasawa
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Patent number: 6371016Abstract: A multicolor printing method and system including a master making device having plurality of removable ink drums replaceable with each other and a printing device. The plurality of removable ink drums are fed with respective masters to be used for printing, by fixed master feeding devices smaller in number than the removable ink drums. The removable ink drums fed with the respective masters are then used by the printing device for printing onto paper. The method and system provides multicolor printing with lower cost, reduced size and accurate registration between the respective masters, as compared to conventional methods and systems.Type: GrantFiled: October 1, 1998Date of Patent: April 16, 2002Assignee: Tohoku Ricoh Co., Ltd.Inventors: Hironobu Takasawa, Manabu Wakamatsu