Patents by Inventor Kazunori Kubota

Kazunori Kubota 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).

  • Patent number: 6037037
    Abstract: The present invention provides a thin multilayer magnetic recording medium having improved electromagnetic conversion property and durability, comprising coating layers of a lower non-magnetic layer and an upper magnetic layer. The non-magnetic layer of this magnetic recording medium comprises a non-magnetic needle body having an average major axis length of 0.25 to 1.0 .mu.m and an average minor axis length of 0.005 to 0.0151 .mu.m, a first binding resin having a glass transition temperature (Tg.sub.1) of 30 to 50.degree. C., and fatty acid ester. The content of the first binding resin is 15 to 30 wt % with respect to the non-magnetic needle body. The content of the fatty acid ester is 2 to 15 wt % with respect to the first binding resin. The magnetic layer having a dry thickness of 0.5 .mu.m or less comprises ferromagnetic powder and a second binding resin having a glass transition temperature (Tg.sub.2) of 40 to 70.degree. C. Tg.sub.1 is at least 5.degree. C. lower than Tg.sub.
    Type: Grant
    Filed: July 6, 1998
    Date of Patent: March 14, 2000
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazunori Kubota, Fumio Echigo, Yukihiro Shimasaki, Takumi Haneda, Hirofumi Ito, Tetuo Fuchi, Kiyoshi Kobata
  • Patent number: 5882012
    Abstract: An oil-submerged sliding member which has a good sealability and wear resistance and low attack to the mating member and which can be used with either a soft or a non-soft mating member. It is made from a resin composition comprising 30-88% by weight of a crosslinked polyallylene sulfide resin having a melt viscosity of 2000-5000 poise at 300.degree. C., 10-45% by weight of a carbon fiber, and 2-25% by weight of recycled polytetrafluoroethylene resin powder, and if required, not more than 10% by weight of molybdenum disulfide. Also, oil seal rings comprising the oil-submerged sliding member.
    Type: Grant
    Filed: November 27, 1996
    Date of Patent: March 16, 1999
    Assignee: NTN Corporation
    Inventors: Hiroshi Niwa, Kazunori Kubota, Eiichiro Shimazu
  • Patent number: 5811179
    Abstract: A magnetic recording medium including a non-magnetic polymeric support and a magnetic layer on the non-magnetic polymeric support. The magnetic layer is positioned to be in contact with a record/playback head and includes ferromagnetic powder, abrasive material and binder resin, with at least 40 parts by weight of the abrasive material per 100 parts by weight of the ferromagnetic powder. The ferromagnetic powder has a saturation magnetization .sigma.s of 80 emu/g or more and long axis length of 0.25 .mu.m or less.
    Type: Grant
    Filed: November 6, 1995
    Date of Patent: September 22, 1998
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Kazunori Sakamoto, Hideo Hatanaka, Yasuhiro Ueyama, Kiyoshi Kobata, Kazunori Kubota, Hideki Okumura
  • Patent number: 5701225
    Abstract: A tape cassette has a pair of reels each including a reel hub, with each hub having an anchor groove defined in an outer peripheral surface thereof so as to extend in a lengthwise direction thereof. A generally elongated clamping piece is received within the anchor groove and has a predetermined width as measured circumferentially of the reel hub. A tape medium includes a length of magnetic recording tape having opposite ends, and a leader tape connected with each of the opposite ends of the length of magnetic recording tape by of a splicing tape of a predetermined length. One end of the leader tape remote from the length of magnetic recording tape is received within the reel hub and anchored to the reel hub with the clamping piece snapped into the anchor groove. The splicing tape is, when the tape medium is wound around the reel hub, positioned immediately radially outwardly of and encompassing the predetermined width of the clamping piece.
    Type: Grant
    Filed: June 6, 1995
    Date of Patent: December 23, 1997
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Hideki Okumura, Kazunori Sakamoto, Kiyoshi Kobata, Kazunori Kubota
  • Patent number: 5263697
    Abstract: A finisher capable of binding a stack of sheets at a plurality of desired positions by a single stapler. When a plurality of stacks of sheets should be each stapled at two positions, the stapler is controlled such that the last stapling position of the preceding stack is the position where the following stack is stapled first.
    Type: Grant
    Filed: October 9, 1991
    Date of Patent: November 23, 1993
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideo Yamazaki, Kazunori Kubota, Yuichi Fujii, Mituru Ichikawa, Yukitaka Nakazato, Kenji Yamada, Yasuo Kosuga
  • Patent number: 5121911
    Abstract: A finisher for use with a copier, printer or similar image forming apparatus for sorting or otherwise finishing recording sheets sequentially driven out of the apparatus. A positioning member in the form of a fur brush urges paper sheets sequentially delivered from the apparatus to a tray of the finisher to a predetermined position. At this instant, the paper positioning member does not interfere with a shifting motion of the tray.
    Type: Grant
    Filed: December 13, 1990
    Date of Patent: June 16, 1992
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideo Yamazaki, Kazunori Kubota, Yuichi Fujii
  • Patent number: 5083760
    Abstract: A finisher for use with a copier, printer or similar image forming apparatus for stapling or otherwise finishing paper sheets sequentially driven out of the apparatus. A paper sheet is introduced in a stapling section of a stapling device by being switched back, while being accurately guided by a guide member having a sufficient length. The stapling device is movable, independently of jogger fences which position paper sheets, to a particular position which is optimal for the size of stacked paper sheets and the position in which they are used. When a staple error detector detects a stapling error, a discharge path in use is switched over to another path. When a stapled paper stack is discharged, it is deformed in a wave-like configuration in a direction perpendicular to an intended direction of transport to be provided with a certain degree of rigidity. This allows the stapled paper stack to be driven out stably, epecially without being loosened at the discharge side.
    Type: Grant
    Filed: April 6, 1990
    Date of Patent: January 28, 1992
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideo Yamazaki, Kazunori Kubota, Yuichi Fujii, Mituru Ichikawa, Yukitaka Nakazato
  • Patent number: 5072920
    Abstract: A finisher for an image forming apparatus for stapling or otherwise finishing paper sheets which are sequentially driven out of an image forming apparatus such as a copier or a printer. The finisher is capable of stapling a stack of paper sheets at any desired position or positions of the sack. A pair of reference fences and a pair of jogger fences are provided on a paper receiver for positioning paper sheets in an intended direction of paper transport and a direction perpendicular thereto, respectively. The reference fences and the jogger fences are reciprocatingly movable in a predetermined direction independently of each other, and each is movable in a symmetrical relation. The jogger fences move independently of a stapler, while the reference fences move along with the stapler by being connected to latter.
    Type: Grant
    Filed: September 12, 1990
    Date of Patent: December 17, 1991
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazunori Kubota, Hideo Yamazaki
  • Patent number: 5056774
    Abstract: A finisher for use with a copier, printer or similar image forming apparatus for stapling or otherwise finishing paper sheets sequentially driven out of the apparatus. The paper sheets entering the finisher one after another are collected on a tray. A paper sorting mechanism moves the tray in a reciprocating motion in a horizontal plane in a direction perpendicular to an intended direction of paper discharge onto the tray. The paper sorting mechanism has a paper pressing member movable in a reciprocating motion in interlocked relation to the tray, a paper positioning member for urging the paper sheet discharged onto the tray to a predetermined position, a drive source for causing the tray into a reciprocating motion, and a drive source for driving the tray in the vertical direction such that the tray receives paper sheets at an optimal level. A height sensor is associated with the paper pressing member for determining that the paper sheets sequentially stacked on the tray has reached a predetermined height.
    Type: Grant
    Filed: April 16, 1990
    Date of Patent: October 15, 1991
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazunori Kubota, Hideo Yamazaki, Yuichi Fujii, Mitsuru Ichikawa
  • Patent number: 5037077
    Abstract: An image forming after-treatment apparatus for stapling sheets of recording paper discharged from an image forming device comprises a discharging tray device arranged in an upper portion of a machine frame of the apparatus; a staple section arranged in a lower portion of the machine frame; an inlet for the sheets of recording paper discharged from the image forming device; a first passage formed from the inlet to the discharging tray device; a second passage formed from the inlet to the staple section; a third passage formed from the staple section to the discharging tray device; and a stapling device arranged in the staple section and stapling the sheets of recording paper on a recording paper receiving portion.
    Type: Grant
    Filed: June 28, 1989
    Date of Patent: August 6, 1991
    Assignee: Ricoh Company, Ltd.
    Inventors: Kazunori Kubota, Hideo Yamazaki
  • Patent number: 4880223
    Abstract: A sorter in which a stepwise bin driving mechanism which includes helical cams moves bins, which are arranged in multiple steps, sequentially and intermittently to a sheet delivery position for loading the respective bins with sheets. The sorter includes pin guides and support frames which are constituted by side plates each being provided with an elongate slot for guiding a pin, which is provided on each side of the base end of a bottom plate of each bin. Cam members are provided at both sides of the other or free end of each bin. The cam members of the lowermost one of the bins have a greater height than those of the other bins so that, while the sorter is in a sort mode, the space available above the bottom plate of the lowermost bin for receiving sheets becomes greater than those available above the other bins. A bin drive motor which serves as a drive source for the bin driving mehanism is implemented with an AC reversible motor.
    Type: Grant
    Filed: December 20, 1988
    Date of Patent: November 14, 1989
    Assignee: Ricoh Company, Ltd.
    Inventors: Hideo Yamazaki, Kazunori Kubota