The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 14, 1998
Filed:
Oct. 30, 1995
Kazuo Sakai, Ibaraki-ken, JP;
Fumio Takeda, Ushiku, JP;
Taichiro Yamashita, Tsuchiura, JP;
Fujio Tajima, Tsuchiura, JP;
Takao Terayama, Ushiku, JP;
Tomokazu Ishii, Ibaraki-ken, JP;
Kooetsu Okuyama, Tsuchiura, JP;
Takayuki Munemoto, Ibaraki-ken, JP;
Nobuyuki Kaku, Kanagawa-ken, JP;
Kenmei Masuda, Yokohama, JP;
Shigeyuki Kobata, Odawara, JP;
Fukuyasu Abe, Fujisawa, JP;
Kenji Ogiro, Yokohama, JP;
Shigemitsu Higuchi, Fujisawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
As a method of increasing the storage capacity of a magnetic recording and reproducing apparatus for recording and reproducing information to and from a magnetic tape in a cartridge, there is a helical scan recording method in which the magnetic tape is diagonally wound around a drum which rotates a magnetic head. With an apparatus adapted to this method, the disposition of the cartridge and the take-up reel for taking up the magnetic tape on the same plane arises a necessity of considerably bending the magnetic tape at the drum portion and, accordingly, the magnetic tape is damaged. In order to prevent the damage of the foregoing type, the tape passage surface from the cartridge to the drum and the tape passage from the drum to the take-up reel are formed by an angle at which the direction in which the magnetic tape is moved is changed due to winding of the magnetic tape around the drum so that the magnetic tape is not bent excessively. A threading device capable of three-dimensionally controlling the position of the magnetic tape in accordance with a predetermined tape passage is provided for the apparatus structured as described above. The threading device is formed by a link mechanism to be moved along the locus of a cam groove so that the three-dimensional position control can be performed.