CASSETTE TAPE RECORDING AND/OR REPRODUCING APPARATUS

Abstract: A cassette tape recording and/or reproducing apparatus capable of selectively loading at least two tape cassettes (6, 7) whose spaces between reels (11) differ from each other, has a pair of reel bases (1) moved to be made to coincide with either of the spaces between the reels (11), a pair of position reference pins (8) used in common to put either of the two tape cassettes (6, 7) in a horizontally and vertically exact position, and a pair of height reference pins (9) moved together with the pair of reel bases (1) to put either of the two tape cassettes (6, 7) in a vertically exact position, so that the bottom face (6a; P₁), the front face (6b, 7b; P₂) and the central plane (P₃) equidistant from a pair of reels (11) of the cassette (6, 7) are exactly put in respective predetermined normal face or plane positions.

Description: This invention relates generally to a cassette tape recording and/or reproducing apparatus, and more particularly to a cassette tape recording and/or reproducing apparatus, such as a cassette tape video recorder or the like, which is capable of selectively loading either of a large-sized tape cassette and a small-sized tape cassette. In commonly used cassette tape recording and/or reproducing apparatus, such as a cassette tape video recorder (hereinafter described in "VTR"), a pair of right and left position reference pins and a pair of right and left height reference pins are provided on a chassis in the apparatus, and the bottom plate of a tape cassette loaded in the apparatus is engaged with these pins so as to put the tape cassette in its horizontally and vertically exact position by the former pins and in its vertically exact position by the latter pins. And generally, the front side part of the bottom plate near the side of an opening for tape-loading is engaged with the position reference pins, and the right and left corners on the rear side of the bottom wall that are the opposite side for the opening are engaged with the respective height reference pins. An apparatus, such as a VTR which is so constructed as to be able to record on or reproduce from tape cassettes of more than two kinds selectively loaded therein, the distances between the centers of a pair of right and left reels are different from one another, such as the large-sized cassette and the small-sized cassette, is known from EP-A-O 133 822 and comprises a cassette holder movable between a cassette inserting position where the cassette is inserted and a tape loading position situated thereunder and where the tape is loaded. This apparatus is provided with a pair of right and left reel bases arranged in said tape loading position and so moved as to make the spindles projecting from them coincide with the reel centers of either the large-sized or the small-sized tape cassette. Generally, the reel bases are moved together with the reel motors which drive the reel bases. To discriminate between the different tape cassettes, there are provided electronic sensors, one for each type of tape cassette. On the other hand, a construction very similar to that of a commonly used VTR would be preferable, i.e. a VTR having height reference pins and position reference pins. However, if the height reference pins of the VTR engaging with the corner portions on the rear side of the small-sized cassette, are carelessly projected from the chassis, the height reference pins are to beset the paths of the reel bases and reel motors. In order to overcome the above problem, what is provided in the VTR of this sort is only one height reference pin engaged with the small-sized cassette at the center of the rear side of its bottom plate but the height reference pin provided like that makes it difficult to provide a guide for making the center line with respect to the width of the small-sized cassette coincide with that of the cassette holder, the guide being requisite while the small-sized cassette is inserted in a cassette holder of the VTR. Furthermore, the height reference pin is generally engaged with the corner portion of the bottom plate of the cassette for the reason why the corner portion is rigid enough to obtain the exact positioning of the cassette. On the contrary, the center portion on the side of the bottom plate is not rigid enough and apt to be deformed when the height reference pin is engaged therewith, so it is difficult to obtain the exact positioning of the cassette. Accordingly it is an object of the present invention to provide a cassette tape recording and/or reproducing apparatus of the known type such that on the basis of the commonly used apparatus an improved exact positioning is possible without interference with its reel motor. In accordance with the present invention a cassette tape recording and/or reproducing apparatus with the precharacterizing features of claim 1 is characterized by a pair of fixed right and left position reference pins (8) used in common to put either of said large-sized and small-sized tape cassettes (6, 7) in a horizontally and vertically exact position, and a pair of right and left height reference pins (9) moved together with said pair of reel bases (1) to put either of said large-sized and small-sized tape cassettes (6, 7) in a vertically exact position. Further features are shown in the subclaims. A further object of this invention to provide a cassette tape recording and/or reproducing apparatus capable of performing recording and/or reproducing of at least two tape cassette, such as a large-sized tape cassette and a small-sized tape cassette having spaces between a pair of right and left reels made difference from each other, the apparatus being so constituted as to make either of the two cassette selectively loaded therein put in an exact position. Still a further object of this invention is to provide an improved tape cassettes--a large-sized tape cassette and a small-sized tape cassette--which have spaces between a pair of right and left reels made difference from each other, the tape cassettes being selectively loaded in a cassette tape recording and/or reproducing apparatus to put themselves in the exact positions within the apparatus. In accordance with an aspect of this invention, a cassette tape recording and/or reproducing apparatus capable of selectively loading at least a large-sized tape cassette and a small-sized tape cassette whose spaces between reels differ from each other is so provided as to comprise a cassette holder movable between a cassette inserting position where the cassette is inserted and a cassette loading position situated thereunder and where the cassette is loaded, a pair of right and left reel bases arranged in the cassette loading position and moved as to be made to coincide with either of the spaces between the reels of the large-sized tape cassette and small-sized tape cassette, a pair of right and left position reference pins used in common to put either of the large-sized tape cassette and the small-sized tape cassette in a horizontally and vertically exact position, and a pair of right and left height reference pins moved together with the pair of reel bases. Also, in accordance with an aspect of this invention, a tape cassette for use in an apparatus according to claims 1 to 3 is so provided as to comprise a pair of right and left positioning holes provided in the bottom face of the cassette and engaged with a pair of right and left position reference pins disposed within the apparatus in order to put the front part of said cassette in its horizontally and vertically, exact position, and a pair of right and left recesses provided in the bottom face of said tape cassette in order to prevent said cassette from contacting a pair of height reference pins disposed within the apparatus to put the small-sized tape cassette in its vertically exact position. The invention is now discussed in detail with reference to the drawings, wherein Figure 1 is a plan view of mobile bases disposed in a cassette tape recording and/or reproducing apparatus according to a first embodiment of this invention; Figure 2 is an elevation view, partly broken away and in section, of a large-sized tape cassette mounted on the mobil bases of Figure 1; Figure 3 is a side view, partly broken away and in section, of the large-sized tape cassette loaded in the cassette tape recording and/or reproducing apparatus of Figure 1; Figure 4 is an elevation view, partly broken away and in section, of a large-sized tape cassette mounted on mobile bases disposed in a cassette tape recording and/or reproducing apparatus according to a second embodiment of this invention; Figure 5 is a side view, partly broken away and in section, of the large-sized tape cassette loaded in the cassette tape recording and/or reproducing apparatus of Figure 4; and Figure 6 is a bottom view of the large-sized tape cassette of Figure 5. Referring to the drawings in detail, a VTR capable of selectively loading a large-sized tape cassette and a small-sized tape cassette, embodying the present invention will be described. Figures 1 to 3 of the drawings show the first embodiment of this invention. As shown in Figures 1 and 2, a pair of right and left mobile bases 3 are movable in direction of arrows a and b each along a pair of guide rails 5 which are horizontally disposed on a chassis 4. A pair of right and left reel bases 1 and a pair of reel motors 2 for driving the reel bases 1 are mounted on the mobile bases 3. Further, a pair of right and left position reference pins 8 and a pair of right and left height reference pins 9 each used in common for positioning the large-sized tape cassette 6 and the small-sized tape cassette 7 are secured to the chassis 4 and the pair of right and left mobile bases 3, respectively. When the large-sized tape cassette 6 is selectively loaded in the VTR, the reel bases 1 and the height reference pins 9 are moved in advance in the direction of arrow a by the mobile bases 3, and the bottom plate 6a of the large-sized tape cassette 6 is made to come in contact with the upper end faces 8a and 9a of the position reference pins 8 and the height reference pins 9. At the same time, the reel bases 1 are fitted into a pair of right and left reel base insertion holes 10 disposed in the bottom plate 6a, so that the spindles 1a projected from the reel bases 1 are engaged with a pair of right and left reels 11 in the cassette 6. Also when the small-sized tape cassette 7 is loaded in the VTR, the reel bases 1 and the height reference pins 9 are moved in advance in the direction of arrow b by the mobile bases 3, and the bottom plate of the small-sized cassette 7 is made to come in contact with the upper end faces 8a and 9a of the position reference pins 8 and the height reference pins 9. At the same time, the spindles 1a of the reel bases 1 are engaged with a pair of right and left reels in the cassette 7. When the upper end faces 8a of the position reference pins 8 come in contact with the bottom plate of the cassette 6, 7, small-sized positioning pins 8b projected from the center of the upper end faces 8a are engaged with a pair of right and left positioning holes 12 provided in the bottom plate of the cassette 6, 7 near the front face 6b, 7b thereof, so that the front part of the cassette 6, 7 is put in its horizontally and vertically exact position. Similarly, when the upper end faces 9a of the height reference pins 9 come in contact with the right and left corners of the bottom plate near the rear face 6c, 7c of the cassette 6, 7, the rear part of the cassette 6, 7 is put in its vertically exact position. Thus, without regard for the large-sized tape cassette 6 or the small-sized tape cassette 7, the bottom face, the front face and the plane equidistant form the right and left reels of the cassette 6, 7 are placed in normal bottom face position P₁, normal front face position P₂ and normal equidistance plane position P₃, respectively. As illustrated in Figure 3, the cassette 6, 7 is selectively inserted in a cassette holder 16 through a cassette insertion opening 15 disposed in the front panel 14 of the VTR. Thereafter, the cassetteholder 16 is horizontally withdrawn in direction of arrow c and then vertically lowered in direction of arrow d along three L-shaped grooves 17. Thus, the cassette 6, 7 is placed on the upper end bases 8a and 9a and pressed against them from above by a cassette push plate 18 so as to locate the cassette 6, 7 in its exact position. In the meantime, when the large-sized cassette 6 is much larger than the small-sized cassette 7 as shown in Figure 1, the height reference pins 9 moved by the mobile bases 3 support the large-sized cassette 6 at the bottom face near the reel base insertion holes 10 as shown in Figures 2 and 3. On the other hand, the reel 11 in the large-sized tape cassette 6 is very large in diameter, around which a long magnet tape 19 is wound, so that the bottom face 6a near the holes 10 of the large-sized tape cassette 6 is apt to be deformed downwards due to the weight of two reels 11 and its low rigidity caused by the existence of the reel base insertion holes 10. Therefore, the large-sized tape cassette 6 supported by the height reference pins 9 as mentioned above is put in a position higher by height h than the normal bottom face position P₁ as shown in Figures 2 and 3, so that the exact positioning of the large-sized cassette 6 becomes difficult. Further, the large-sized cassette 6 supported both at the front side and near the reel base insertion holes 10 of the bottom face 6a by the four reference pins 8 and 9 is apt to be unstable. The larger the cassette 6 is, the more the cassette 6 is unstable, particularly at the side near the rear face 6C of the cassette 6. To overcome such problems, a pair of right and left height reference pins 21, the space between which is large, are projected from the chassis 4 at the rear sides of the height reference pins 9, in other words, in relations that the position reference pins 8 and height reference pins 21 are disposed on opposite sides to the height reference pins 9 as indicated in chain-dotted lines in Figure 1 to 3, and thereby, the right and left corner portions 22 of the bottom face 6a near the rear face 6c of the large-sized cassette 6 are stably supported. However, as the bottom face 6a of the large-sized cassette 6 is not so accurate in its flatness and the heights of the six reference pins--two position reference pins 8 and four height reference pins 9 and 21--generally differ a little from one another, so the large-sized cassette 6 is unstably supported on these six reference pins 8, 9 and 21. It seems to overcome the above problem to make the height reference pins 9 lower downwards when the large-sized cassete 6 is loaded, but it must lead to making the construction of the apparatus complex and the manufacture thereof much difficult. Now, the second embodiment of this invention will be described on reference to Figures 4 to 6 to overcome the problem. In the following description, the same parts of the consturction as those shown in Figures 1 to 3 are denoted by the same reference numerals to make no explanation thereof. As shown in Figure 6, the large-sized cassette 6 indicated in solid lines is much larger than the small-sized cassette 7 indicated in chain-dotted lines. The position reference pins 8 used in common for positioning the large-sized cassette 6 and the small-sized cassette 7 are fixed to the chassis 4. The height reference pins 9 for positioning the small-sized cassette 7 are fixed to the mobile base 3, and the height reference pins 21 for positioning the large-sized cassette 6 are fixed to the chassis 4. The former height reference pins 9 may be fixed to the chassis 4 lest they should interfere with the movements of the mobile bases 3. Provided near the reel base insertion holes 10 in the bottom face 6a of the large-sized cassette 6 are a pair of right and left recesses 23, the inner diameters of which are larger than the outer diameters of the height reference pins 9, and these recesses 23 come just over the height reference pins 9 when the mobile bases 3 are moved in the direction of arrow a in Figure 1 so as to make them fit for the large-sized cassette 6. Thus, the bottom base 6a of the large-sized cassette 6 does not come in contact with the height reference pins 9 for positioning the small-sized cassette 7 owing to the recesses 23, when the bottom base 6a comes in contact with the upper end faces 8a of the position referencepins 8 near the front face 6b of the cassette 6 and with the upper faces 2la of the height reference pins 21 at the right and left corner portions 22 near the rear face 6c of the cassette 6. That is, as the large-sized cassette 6 is supported by not six but four reference pins position reference pins 8 and height reference pins 21--and that at the corner portions 22 of the bottom face 6a near the rear face 6c thereof, the stability of the cassette 6 is much improved, and further, the bottom face 6a thereof is exactly put in the normal bottom face position P₁. And the same may be said of the small-sized cassette 7, because the cassette 7 is supported only by the position reference pins 8 and height reference pins 9 in the same manner as mentioned in the first embodiment. And this invention can be applied not only to the VTR but also to the various kinds of cassette tape recorder and data processing device. The apparatus of this invention has the pair of position reference pins 8 used in common for the large-sized tape cassette 6 and the small-sized tape cassette 7, and two pairs of height reference pins--the pins 21 used for the large-sized tape cassette 6 and the pins 9 used for the small-sized tape cassette 7. Therefore, whether the cassette 6, 7 is large or small, the front portion of the cassette 6, 7 selectively loaded in the apparatus is put in its accurate horizontal and vertical position by the help of the position reference pins 8 which support the right and left portions near the front face 6b, 7b of the cassette 6, 7 and the rear portion of the cassette 6, 7 is put in an accurate vertical position by the help of the respective height reference pins 9, 21 which support the right and left corner portions 22 near the rear face 6c, 7c of the cassette 6, 7, so that the bottom face 6a, the front face 6b, 7b and the central plane equidistant from the pair of reels 11 of the cassette 6, 7 are exactly put in the respective predetermined normal face or plane positions P₁, P₂ and P₃. Particularly, in case of the second embodiment, the large-sized cassette 6 loaded in the apparatus is made to be out of contact with the height reference pins 9 for positioning the small-sized cassette 7, only with the pair of recesses 23 simply disposed near the reel base insertion holes 10 thereof. In other words, it is unnecessary to adopt such a very complex construction as to lower the pair of height reference pins 9 when the large-sized tape cassette 6 is loaded, so as to prevent the large-sized cassette 6 from contact with the pair of height reference pins 9. Further, the large-sized tape cassette 6 is positioned with much accuracy without being influenced by the deformation of the bottom face 6a near the reel base insertion holes 10 thereof, so that the accuracy of recording and reproducing of the large-sized cassette 6 is much improved.

Claims: A cassette tape recording and/or reproducing apparatus capable of selectively loading at least a large-sized tape cassette (6) and a small-sized tape cassette (7) with different distances between the centers of their reels (11) and comprising a cassette holder (16) movable between a cassette inserting position where the cassette (6,7) is inserted and a tape loading position situated thereunder and where the cassette (6,7) is loaded, and a pair of right and left reel bases (1) arranged in said tape loading position and so moved as to make the spindles projecting from them coincide with the reel centers of either the large-sized or the small-sized tape cassettes (6,7), characterized by a pair of fixed right and left position reference pins (8) used in common to put either of said large-sized and small-sized tape cassettes (6,7) in a horizontally and vertically exact position, and a pair of right and left height reference pins (9) moved together with said pair of reel bases (1) to put either of said large-sized and small-sized tape cassettes (6,7) in a vertically exact position. An apparatus according to claim 1, characterized in that said pair of height reference pins (9) are disposed on a pair of mobile bases (3) for moving said pair of reel bases (1) and used to put said small-sized tape cassette (7) in its horizontally exact position. An apparatus according to claim 1 or 2, characterized in that said pair of height reference pins (9) moved together with said pair of reel bases (1) are used for positioning said small-sized tape cassette (7), and a pair of right and left height reference pins (21) for positioning said large-sized tape cassette (6) and said pair of position reference pins (8) used in common are fixed to a chassis (4). A large-sized tape cassette for use in an apparatus according to anyone of claims 1 to 3, characterized by a pair of right and left positioning holes (12) provided in the bottom face (6a) thereof and engageable with the pair of right and left position reference pins (8) disposed within said apparatus in order to put the front part of said cassette (6) in its horizontally and vertically exact position, and a pair of right and left recesses (23) provided in said bottom face (6a) in order to prevent said cassette (7) from contacting a pair of height reference pins (9) disposed within said apparatus to put a small-sized tape cassette (7) in its vertically exact position. A tape cassette according to claim 4, characterized in that said pair of right and left recesses (23) are disposed near a pair of right and left reel base insertion holes (10) provided in said bottom face (6a) of said large-sized tape cassette (6). A tape cassette according to claim 4 or 5, characterized in that the corner portions (22) of said bottom face (6a) of said large-sized tape cassette (6) are formed into an exactly horizontal plane and are made to come in contact with a pair of right and left height reference pins (21) disposed within said apparatus so as to put said large-sized tape cassette (6) in its vertically exact position.

Inventors: INOUE, KENICHI C/O SONY CORPORATION, OHTANI, TAKAHIDE C/O SONY CORPORATION
Applicants: SONY CORPORATION
Application year: 1986
Main classification: G11B25
IPC codes: G11B15, G11B23, G11B25