CA1322413C - Tape cassette - Google Patents
Tape cassetteInfo
- Publication number
- CA1322413C CA1322413C CA000616272A CA616272A CA1322413C CA 1322413 C CA1322413 C CA 1322413C CA 000616272 A CA000616272 A CA 000616272A CA 616272 A CA616272 A CA 616272A CA 1322413 C CA1322413 C CA 1322413C
- Authority
- CA
- Canada
- Prior art keywords
- cassette
- pair
- tape cassette
- sized
- reference pins
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
Landscapes
- Automatic Tape Cassette Changers (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A tape cassette which is the large one of at least a large-sized tape cassette and a small-sized tape cassette, whose center-to-center spaces between a pair of right and left reels differ from each other and each capable of being selectively loaded in a cassette tape recording and/or reproducing apparatus, said tape cassette comprises a pair of right and left positioning holes provided in the bottom face thereof and engaged with a pair of right and left position reference pins disposed within said apparatus in order to put itself in it horizontally and vertically exact position, and a pair of right and left recesses provided in said bottom face in order to prevent itself from contact with a pair of height reference pins disposed within said apparatus to put the small-sized tape cassette in its vertically exact position.
A tape cassette which is the large one of at least a large-sized tape cassette and a small-sized tape cassette, whose center-to-center spaces between a pair of right and left reels differ from each other and each capable of being selectively loaded in a cassette tape recording and/or reproducing apparatus, said tape cassette comprises a pair of right and left positioning holes provided in the bottom face thereof and engaged with a pair of right and left position reference pins disposed within said apparatus in order to put itself in it horizontally and vertically exact position, and a pair of right and left recesses provided in said bottom face in order to prevent itself from contact with a pair of height reference pins disposed within said apparatus to put the small-sized tape cassette in its vertically exact position.
Description
Field of the Invention 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.
Description of the Prlor Art In 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 openlng for tape-loadiny 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. :
' , ,:
, In the meantime, the recent VTR is often so constructed as to be able to record on or reproduce from the tape cassette of more than two kinds selectively loaded therein, the spaces between a pair of right and left reels of which are different from one another, s~lch as the large-sixed cassette and the small-sized cassette.
In the VTR of this sort, a pair of right and left reel bases are automatically moved so as to make the space between the reel bases coincide with the space between the reels of the loaded cassette, such as the large-sized cassette or the small-sized cassette, and generally, the reel bases are moved together with the reel motors which drive the reel bases.
~ owever, if the height xeference 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 basses and reel motors.
In order to overcome the above problem, provided in the VTR of this sort is only one height reference pin engaged with the small-siæed cassette at the center of the rear side of lts bottom plate but the height reference pin provided like that makes lt difficult to provide~ a guide for making the center line with respec to the width of the smali-sized cassette colncide : with that of the cassette holder, the guide ~eing requisite while the:small-sized cassette is lnserted in~ a oassette holder of the VTR o ' ~: - 2 -:
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, 90 it is difficult to obtain the exact positioning of the cassette.
Where a pair of height reference pins of the VTR engaging with corner portions on a rear side of a small-sized cassette are provided so as not to impede the movement of the reel bases, if the reel of a large-sized tape cassette is very large in diameter compared with that of the small-sized tape cassette, the large-sized tape cassette is supported by the height reference pins at portions near a pair of reel base insertion holes where are not rigid enough to keep the shape, with the result that the support of the large-sized tape cassette becomes unstable. Thus, it is difficult to obtain the exact positioning of the large-sized tape ~assette.
.
~ 3 -OBJECTS AND SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a tape cassette capable to be loaded in an exact position of a cassette tape recording and/or reproducing apparatus which selectively loads a large-sized tape cassette and a small-sized tape cassette whose center-to~center spaces between reels differ from each other.
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' In accordance with an aspect of this invention, a tape cassette which is the large one of at least a large-sized tape cassette and a small-sized tape cassette, whose center-to-center spaces between a pair of right and left reels differ from each other and each capable of being selectively loaded in a cassette tape recording and/or reproducing apparatus, said tape cassette comprises a pair of right and left positioning holes provided in the bottom face thereof and engaged with a pair of right and left position reference pins disposed within said apparatus in order to put itself in its horizontally and vertically exact position, and a pair of right and left recesses provided in said bottom face in order to prevent itself from contact with a pair of height reference pins disposed within said apparatus to put the small-sized tape cassette in its vertically exact position.
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BRIEF DESCRIPTION OF THE DRAWINGS.
Figure 1 is a plane view of mobile bases disposed in a cassette tape recording and/or reproducing apparatus according to a first embodiment of this invantion : - 5 -`r, '~
1 3~24 t 7) Figure 2 is an elevation view, partly broken away and in s~ction, of a large-sized tape cassette mounted on the mobil bases of Figure l;
Figure 3 is a side viewl partly broken away and in section, of the large-sized tape cassette loaded in the cassette tape recording and/or reproducing apparatus of Figure l;
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 si~ed tape cassette loaded in the casse~te 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.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Refexring 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 fixst embodiment of this invention. As shown in Figures 1 and 2, a pair of right and left mobile bases 3 are movable in directlon of arrows a and b each along a pair of guide ralls 5 whi~h are horizontally disposed on a chassis 4. A pair of right and left reel bases 1 and a pair of reel motors 2 or driving the reel bases 1 are mounted on the mobile bases 3 Further, a pair of right and left .
~ 1 3224 1 3 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 movile bases 3, and the bottom plate 6a of the large-sized tape cassette 6 is made to come in contact wi~h 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 la 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 heiyht reference plns 9 are moved in advance in the direction of arrow b by the mobile bases 3, and the bottom plate o~ the small-sized cassette 7 ls 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 la of the reel bases 1 are engaged with a pair of r~ght 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, 7~ thereof, so that the front part of the cassette 6, 7 is put in its horizontally and vertically exact position.
Simllarly, 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-siz~d 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 Pl, normal front face position P2 and normal equidistance plane position P3, respectively~
As illustrated in Figure 31 the cassette 6, 7 is selectively inserted in a:cassette holder 16 through a cassette insertion opening 15 disposed ln the front panel 14 of the VTR.
Thereafter, the cassetteholder 16 is horizontally wi~hdrawn in direction o~ arrow c and then vertically lowere:d~in dire~tlon of .
:
`-~ 1322413 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 hases 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 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 helght reference pins 9 as mentioned abave is put in a position higher by height h than the normal bottom face position P as shown in Figures 2 and 3, so that the exact positioning of the large-sized cassette 6 becomes difficult~ Further, the laxge-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 xeference 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 5.
: ~ _ 9 _ :
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' , " ~ ' ' ' . , , , , ~ .
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1 ~224 1 3 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 50 accurate ln 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-si2ed 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-siæed 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.
, .
13~2~13 As shown in Figure 6, the large- ized 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. ~he height reference pins 9 for positioning the small~sized casRette 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 hase 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 wlth the upper end faces 8a of the position referencepins 8 near the front face 6b o~ the cassette 6 and with the upper faces 21a o~ the height reference pins 21 at the right and left corner portlons 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 Pl.
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 helght reference pins 9 in the same manner as mentioned in the first embodiment.
Having described illustrative embodiment of this invention with reference to the accompanying dxawings, it is to be understood that the invention is not limited to those precise embodiments, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention as defined in the appended claims.
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 cassetté
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 positlon by the help of the respective height reference pins 9, 21 whlch support the right and le~t 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 Pl, P2 and P3.Particularly, in case of the second embodiment, the large-sized cassette 6 loaded in the apparatus is made to be out o~ contact with the height reference pins 9 for positloning 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 constructin 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 oontact with the pair of helght reference pins 9. Further, the large-sized tape cas-~ette 6 is positioned with much accuracy without beiny lnfluenced by the defonmatlon 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.
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Description of the Prlor Art In 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 openlng for tape-loadiny 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. :
' , ,:
, In the meantime, the recent VTR is often so constructed as to be able to record on or reproduce from the tape cassette of more than two kinds selectively loaded therein, the spaces between a pair of right and left reels of which are different from one another, s~lch as the large-sixed cassette and the small-sized cassette.
In the VTR of this sort, a pair of right and left reel bases are automatically moved so as to make the space between the reel bases coincide with the space between the reels of the loaded cassette, such as the large-sized cassette or the small-sized cassette, and generally, the reel bases are moved together with the reel motors which drive the reel bases.
~ owever, if the height xeference 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 basses and reel motors.
In order to overcome the above problem, provided in the VTR of this sort is only one height reference pin engaged with the small-siæed cassette at the center of the rear side of lts bottom plate but the height reference pin provided like that makes lt difficult to provide~ a guide for making the center line with respec to the width of the smali-sized cassette colncide : with that of the cassette holder, the guide ~eing requisite while the:small-sized cassette is lnserted in~ a oassette holder of the VTR o ' ~: - 2 -:
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, 90 it is difficult to obtain the exact positioning of the cassette.
Where a pair of height reference pins of the VTR engaging with corner portions on a rear side of a small-sized cassette are provided so as not to impede the movement of the reel bases, if the reel of a large-sized tape cassette is very large in diameter compared with that of the small-sized tape cassette, the large-sized tape cassette is supported by the height reference pins at portions near a pair of reel base insertion holes where are not rigid enough to keep the shape, with the result that the support of the large-sized tape cassette becomes unstable. Thus, it is difficult to obtain the exact positioning of the large-sized tape ~assette.
.
~ 3 -OBJECTS AND SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a tape cassette capable to be loaded in an exact position of a cassette tape recording and/or reproducing apparatus which selectively loads a large-sized tape cassette and a small-sized tape cassette whose center-to~center spaces between reels differ from each other.
.
: : - 4 -r d~
.
' In accordance with an aspect of this invention, a tape cassette which is the large one of at least a large-sized tape cassette and a small-sized tape cassette, whose center-to-center spaces between a pair of right and left reels differ from each other and each capable of being selectively loaded in a cassette tape recording and/or reproducing apparatus, said tape cassette comprises a pair of right and left positioning holes provided in the bottom face thereof and engaged with a pair of right and left position reference pins disposed within said apparatus in order to put itself in its horizontally and vertically exact position, and a pair of right and left recesses provided in said bottom face in order to prevent itself from contact with a pair of height reference pins disposed within said apparatus to put the small-sized tape cassette in its vertically exact position.
.
BRIEF DESCRIPTION OF THE DRAWINGS.
Figure 1 is a plane view of mobile bases disposed in a cassette tape recording and/or reproducing apparatus according to a first embodiment of this invantion : - 5 -`r, '~
1 3~24 t 7) Figure 2 is an elevation view, partly broken away and in s~ction, of a large-sized tape cassette mounted on the mobil bases of Figure l;
Figure 3 is a side viewl partly broken away and in section, of the large-sized tape cassette loaded in the cassette tape recording and/or reproducing apparatus of Figure l;
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 si~ed tape cassette loaded in the casse~te 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.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
Refexring 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 fixst embodiment of this invention. As shown in Figures 1 and 2, a pair of right and left mobile bases 3 are movable in directlon of arrows a and b each along a pair of guide ralls 5 whi~h are horizontally disposed on a chassis 4. A pair of right and left reel bases 1 and a pair of reel motors 2 or driving the reel bases 1 are mounted on the mobile bases 3 Further, a pair of right and left .
~ 1 3224 1 3 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 movile bases 3, and the bottom plate 6a of the large-sized tape cassette 6 is made to come in contact wi~h 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 la 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 heiyht reference plns 9 are moved in advance in the direction of arrow b by the mobile bases 3, and the bottom plate o~ the small-sized cassette 7 ls 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 la of the reel bases 1 are engaged with a pair of r~ght 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, 7~ thereof, so that the front part of the cassette 6, 7 is put in its horizontally and vertically exact position.
Simllarly, 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-siz~d 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 Pl, normal front face position P2 and normal equidistance plane position P3, respectively~
As illustrated in Figure 31 the cassette 6, 7 is selectively inserted in a:cassette holder 16 through a cassette insertion opening 15 disposed ln the front panel 14 of the VTR.
Thereafter, the cassetteholder 16 is horizontally wi~hdrawn in direction o~ arrow c and then vertically lowere:d~in dire~tlon of .
:
`-~ 1322413 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 hases 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 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 helght reference pins 9 as mentioned abave is put in a position higher by height h than the normal bottom face position P as shown in Figures 2 and 3, so that the exact positioning of the large-sized cassette 6 becomes difficult~ Further, the laxge-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 xeference 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 5.
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' , " ~ ' ' ' . , , , , ~ .
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1 ~224 1 3 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 50 accurate ln 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-si2ed 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-siæed 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.
, .
13~2~13 As shown in Figure 6, the large- ized 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. ~he height reference pins 9 for positioning the small~sized casRette 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 hase 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 wlth the upper end faces 8a of the position referencepins 8 near the front face 6b o~ the cassette 6 and with the upper faces 21a o~ the height reference pins 21 at the right and left corner portlons 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 Pl.
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 helght reference pins 9 in the same manner as mentioned in the first embodiment.
Having described illustrative embodiment of this invention with reference to the accompanying dxawings, it is to be understood that the invention is not limited to those precise embodiments, and that various changes and modifications may be effected therein by one skilled in the art without departing from the scope or spirit of the invention as defined in the appended claims.
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 cassetté
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 positlon by the help of the respective height reference pins 9, 21 whlch support the right and le~t 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 Pl, P2 and P3.Particularly, in case of the second embodiment, the large-sized cassette 6 loaded in the apparatus is made to be out o~ contact with the height reference pins 9 for positloning 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 constructin 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 oontact with the pair of helght reference pins 9. Further, the large-sized tape cas-~ette 6 is positioned with much accuracy without beiny lnfluenced by the defonmatlon 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
THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE PROPERTY OR
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A tape cassette which is the large one of at least a large-sized tape cassette and a small-sized tape cassette, whose center-to-center spaces between a pair of right and left reels differ from each other and each capable of being selectively loaded in a cassette tape recording and/or reproducing apparatus, said tape cassette comprising a pair of right and left positioning holes provided in the bottom face thereof and engaged with a pair of right and left position reference pins disposed within said apparatus in order to put itself in its horizontally and vertically exact position, and a pair of right and left recesses provided in said bottom face in order to prevent itself from contact with a pair of height reference pins disposed within said apparatus to put the small-sized tape cassette in its vertically exact position.
2. A tape cassette according to claim 1, wherein said pair of right and left recesses are disposed near a pair of right and left reel base insertion holes provided in said bottom face of the tape cassette.
3. A tape cassette according to claim 1, wherein the corner portions of said bottom face of the tape cassette are formed into an exactly horizontal plane and are made to come in contact with a pair of right and left height reference pins disposed within said apparatus so as to put said large-sized cassette in its vertically exact position.
PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A tape cassette which is the large one of at least a large-sized tape cassette and a small-sized tape cassette, whose center-to-center spaces between a pair of right and left reels differ from each other and each capable of being selectively loaded in a cassette tape recording and/or reproducing apparatus, said tape cassette comprising a pair of right and left positioning holes provided in the bottom face thereof and engaged with a pair of right and left position reference pins disposed within said apparatus in order to put itself in its horizontally and vertically exact position, and a pair of right and left recesses provided in said bottom face in order to prevent itself from contact with a pair of height reference pins disposed within said apparatus to put the small-sized tape cassette in its vertically exact position.
2. A tape cassette according to claim 1, wherein said pair of right and left recesses are disposed near a pair of right and left reel base insertion holes provided in said bottom face of the tape cassette.
3. A tape cassette according to claim 1, wherein the corner portions of said bottom face of the tape cassette are formed into an exactly horizontal plane and are made to come in contact with a pair of right and left height reference pins disposed within said apparatus so as to put said large-sized cassette in its vertically exact position.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985194863U JPH0648588Y2 (en) | 1985-12-18 | 1985-12-18 | Cassette positioning device |
| JP194863/85 | 1985-12-18 | ||
| CA000524909A CA1310749C (en) | 1985-12-18 | 1986-12-10 | Cassette tape recording and/or reproducing apparatus |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000524909A Division CA1310749C (en) | 1985-12-18 | 1986-12-10 | Cassette tape recording and/or reproducing apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1322413C true CA1322413C (en) | 1993-09-21 |
Family
ID=25671174
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000616272A Expired - Lifetime CA1322413C (en) | 1985-12-18 | 1992-03-03 | Tape cassette |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1322413C (en) |
-
1992
- 1992-03-03 CA CA000616272A patent/CA1322413C/en not_active Expired - Lifetime
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| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed | ||
| MKEC | Expiry (correction) |
Effective date: 20121205 |