Winding – tensioning – or guiding – Strand tensioning device – Tortuous course
Patent
1988-03-07
1989-07-04
Werner, David
Winding, tensioning, or guiding
Strand tensioning device
Tortuous course
242199, 360 60, 360132, G11B 2304
Patent
active
048443778
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a tape cassette employed, for example, for video tape recorders (which will hereinafter be referred to as VTR) and so on, and more particularly to such a tape cassette suitable for VTRs which allows loading of tape cassettes of two, large and small, classes (kinds) whose dimensions and mechanisms are respectively different from each other.
BACKGROUND OF THE INVENTION
Known hitherto as such a VTR system are 3/4-inch VTRs and VHSVTRs and, in 3/4-inch VTRs, in order to allow use of two, large and small, classes of cassettes, each of said cassettes is arranged to have guide channels so as to be guided to a predetermined position in a cassette garage. On the other hand, in VHSVTR cassettes, an adapter is attached to a smaller cassette so as to be used similarly to a larger cassette and the smaller cassette is guided to a predetermined position in a cassette garage.
Here, a prior arrangement of the VHSVTR system will be described with reference to FIGS. 18 through 24.
A structure of a VTR is illustrated in FIG. 18, in which numeral 1 represents a tape-cassette garage (which will hereinafter be referred to as cassette garage) for guiding insertion of a cassette. The cassette garage 1 has a frontage 2 whose dimension is slightly greater in length and height than that of the larger cassette and is provided with a pair of holes 3 and a projection 4 at its bottom surface 1a and equipped with a pair of cut-and-raised portions 5 at the front edge of its bottom surface 1a. In addition, the cassette garage 1 is arranged to be movable upwardly and downwardly by means of a sliding mechanism, not shown. On the other hand, below the cassette garage 1 are provided a pair of reel bases 7 which are fixed on a bedplate 6 and which are rotated by means of a motor, not shown, so that the reel bases 7 are fitted in the holes 3 in response to downward movement of the cassette garage 1.
FIG. 19 is an illustration of a structure of a large cassette 8. The body 9 of the large cassette 8 is made up by engagement and fastening of an upper case 9a and a lower case 9b and encases a pair of tape reels 10. At the front face of the cassette body 9 is defined an opening portion 11 and along the opening portion 11 is stretched a magnetic tape (not shown) wound around the tape reels 10. Numeral 12 is an opened and closed cover provided rotatably with respect to the case body 9 for covering from the outside the magnetic tape (not shown) stretched along the opening portion 11. At a substantial center portion of the opened and closed cover 12 is provided a recess 13 for prevention of a reverse-insertion and, when as shown in FIG. 20 the large cassette 8 is inserted with the upper portion and lower portion thereof being reversed, the projection 4 and the recess 13 come into contact with each other so as to prevent the insertion in advance. Numeral 14 represents a guide channel provided at the bottom surface of the cassette body 9 and numeral 15 designates a safety lug. FIG. 21 shows a structure of a small cassette 16. The body 17 of the small cassette 16 is made up with engagement and fastening of an upper case 17a and a lower case 17b and encases a pair of tape reels 18, 19. On the periphery of a lower flange 19a of the tape reel 19 are formed teeth 20 which are exposed from a side surface of the cassette body 17. Numeral 21 is an opened and closed cover provided on the case body 17 for covering a magnetic tape (not shown) wound around the tape reels 18 and 19 from the front side.
FIG. 22 illustrates the structure of a cassette adapter 22, whose outer dimension is equal to that of the large cassette 8, for encasing the small cassette 16. The cassette adapter 22 has the same outer dimension as the large cassette 8 and, at the left side, has a space 23 for encasing the small cassette 16. In the space 23 are provided arms 25 each of which has a guide roller 24 planted at one end portion thereof for stretching the magnetic tape (not shown) wound around the reels 18, 19 up to the same position
REFERENCES:
patent: 3758048 (1973-09-01), Sugaya et al.
patent: 4536812 (1985-08-01), Oishi et al.
patent: 4680660 (1987-07-01), Ueda
patent: 4757399 (1988-07-01), Peterson et al.
Kamiyama Toshibumi
Kawagishi Masao
Matsui Masahiko
Nishimura Akihiro
Sakumoto Hideki
Matsushita Electric - Industrial Co., Ltd.
Werner David
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