JPS6325566Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an adapter for a small tape cassette, and the axial cross-sectional shape of the tooth tip of the intermediate gear of the adapter fitted to one reel shaft of a recording/reproducing device is made into an arcuate shape. An object of the present invention is to provide an adapter for a small tape cassette that can perform gear transmission.

The present applicant has previously proposed a tape cassette that is smaller than the standard tape cassette, and an adapter for use in attaching this small tape cassette to a standard recording/reproducing device. This adapter accommodates a small tape cassette and performs tape loading to form a tape path in the adapter that corresponds to the front tape path of a standard tape cassette. Similarly,
It is attached to the recording/playback device. By the play operation, the tape is pulled out from the adapter and wound around the drum, and the playback operation is performed.

In the above adapter, when attached to a recording/playback device, one intermediate gear of the adapter and one reel of the small tape cassette are respectively fitted to a pair of reel shafts of the recording/playback device so as to be able to rotate integrally, and the one reel shaft When the intermediate gear (intermediate gear) is rotationally driven, the rotational force of the intermediate gear is transmitted to the other reel of the small tape cassette via the small gear, and the other reel is rotationally driven as the take-up reel, and the recording or Regeneration, etc. are now taking place. Here, when the adapter is installed, it does not simply move downward in a horizontal state, but moves downward with a slight rotation, so the center axes of the intermediate gear and the reel shaft are likely to be misaligned, making it difficult to fit them together smoothly. Therefore, this intermediate gear must be constructed to absorb the above-mentioned deviation.

For this reason, in the above adapter, the rotating shafts of the intermediate gear and the small gear are connected by a link, and the intermediate gear is made to be able to revolve around the small gear via the link, and the shafts of the intermediate gear and the small gear are The intermediate gear had eccentric play while maintaining a constant distance and meshing state.

However, according to this, there are problems in that the structure of the link mechanism is complicated, and the directionality of the intermediate gear in the eccentric direction is limited, so that the fitting to the reel shaft tends to become unstable.

The present invention solves the above problems, and an embodiment thereof will be described below with reference to the drawings.

1 and 2 are a partially cut-away plan view and a vertical cross-sectional view taken along the line - in FIG. 1, respectively, of an embodiment of the adapter for a small tape cassette according to the present invention.
In the figure, an adapter 1 for a small tape cassette has substantially the same external dimensions as a standard tape cassette.
It has a small tape cassette storage part 2 inside, and further incorporates loading arms 5 and 6 (rotating around pins 5a and 6a, respectively) having poles 3 and 4 at their tips, and a gear train 7, etc. It will be done.

The gear train 7 includes a gear 9 that rotates integrally with the operation knob 8, and a gear shaft 10 (a small diameter gear 10a, a large diameter gear 10).
(with a one-way pawl clutch between b), gear shaft 11
(having a small diameter gear 11a and a large diameter gear 11b), an intermediate gear 12 (having a disk gear 12a), and a gear shaft 13 (having a small diameter gear 13a and a large diameter gear 13b); The intermediate gear 12 is supported only by the upper fixing plate 14, and the gear shaft 13 is supported between the fixing plate 14 and the lower plate 1a of the adapter 1.

As shown in FIG. 3, the intermediate gear 12 has a cylindrical shape having an upper disk gear 12a and an inner circumference fitting part 12b, and a ball bearing 21 is fitted into the upper inner circumference small diameter part 12c. It is attached to the upper fixing plate 14 by inserting and fixing the pin 22 into the cut-and-raised plate portion 14a of the upper fixing plate 14. According to this, only the upper side of the intermediate gear 12 is suspended from the fixed plate 14 via the ball bearing 21 and the pin 22, and the ball bearing 21
With the pin 22 as a fulcrum, as shown by the arrow in Figure 3, the center axis (pin 22) is moved by the gap between the inner and outer rings.
It can swing freely in 360° directions. As shown in FIG. 4, the disc gear 12a has a thin axial thickness and the axial cross-sectional shape of the tooth tip is formed in an arc shape. Even if it swings as shown by the middle arrow, the meshing with the gear 11b (and even the gear 13a) does not become defective and good meshing can always be achieved.

23 is a small tape cassette, and as shown in FIGS. 2 and 5, a pair of reels 25, 26,
A lid 2 which has a magnetic tape 27 wound therebetween and further rotates upward by 90 degrees with a pin 28 on the front surface as a fulcrum.
It has 9. The reel 25 has a reel gear 25a on the outer periphery of the lower flange, and is supported by the housing 24 with pins 30 without play, and the reel 26 is connected to the fitting part 26.
a, and is loosely fitted into the lower hole 24a of the housing 24.

Next, a description will be given of how to attach the small tape cassette to the adapter and to the recording/reproducing device.
The small tape cassette 23 is connected to the adapter 1 in Fig. 1.
(The loading arms 5 and 6 are in the unloading position shown by solid lines in the figure).The reel gear 25a is stored in the storage section 2 with the lid 29 open, and the reel gear 25a is meshed with the large diameter gear 13b. After that, the top cover 31 of the adapter 1 is closed.

Next, when the operating knob 8 is manually rotated clockwise in FIG. At the same time, the arm 6 rotates counterclockwise via a link and a gear train (both not shown) to reach the position indicated by a chain double-dashed line in the figure. As a result, the tape 27 is pulled out from within the small tape cassette by the poles 3 and 4, and finally forms the front tape path 32 of the standard tape cassette. During this time, the small diameter gear 10a meshing with the gear 9 also rotates counterclockwise in FIG. 1, but the large diameter gear 10b does not rotate due to the action of the one-way pawl clutch.
The rotational force from the operating knob 8 is not transmitted to the tape 27, and the tape 27 simply rotates freely as the tape 27 is pulled out.

Next, after storing the adapter 1 in the cassette housing of the recording/reproducing apparatus, the cassette housing is pushed down. Then, the adapter 1 moves downward, and as shown in FIG.
The fitting portions 26a of No. 6 are fitted to a pair of reel shafts 33 and 34 of a recording/reproducing device, respectively, so as to be able to rotate integrally therewith.
At this time, the adapter 1 does not simply move downward in a horizontal state, but moves downward while making an arc movement, but the intermediate gear 12
As mentioned above, the reel 26 is swingable in a direction of 360 degrees with respect to its central axis, and the reel 26 is also attached to the housing 24.
Since it has a predetermined clearance with respect to the lower hole 24a, it can be fitted well to the reel shafts 33 and 34 without being pinched during fitting. Also, intermediate gear 1
The disc gear 12a of No. 2 has a thin thickness and the axial cross-sectional shape of the tooth tips is arcuate, so that when the intermediate gear 12 swings, the meshing angle changes only slightly with respect to the gears 11b and 13a, resulting in good meshing. The state remains unchanged.

Next, when the recording/reproducing apparatus performs recording or reproduction, the reel shaft 33 (intermediate gear 12) on the right side in FIG. 2 is rotated clockwise. Then, the disc gear 12a, gears 13a, 13b,
The reel 25 is similarly rotated clockwise via the reel gear 25a, and the tape 27 is run in the direction of arrow A in FIG. 1, thereby performing the above-mentioned recording or reproduction. At this time, the gear shaft 11 is displaced in the escape direction with respect to the intermediate gear 12, and the gears 11b and 12a are disengaged, so that the unnecessary load is removed. Also, when rewinding the tape, the reel shaft 34 on the left side in FIG.
(Reel 26) is rotated counterclockwise, and tape 27 is run at high speed in the direction of arrow B in FIG. At this time as well, the gears 11b and 12a are disengaged.

Next, the removal of the small tape cassette 23 after the adapter 1 has been taken out from the cassette housing will be described. At this time, the gears 11b and 12a have been returned to meshing. First, when the operation knob 8 is rotated counterclockwise in FIG. 1 and returned to the position indicated by the chain double-dashed line in the same figure, the arm 5 is moved from the position shown by the chain double-dashed line in the figure through the special chain to the unloading position shown by the solid line. The arm 6 returns to the pointing position and the arm 6 similarly returns to the solid line position. During this time, the reel 25 is rotated clockwise by the sequential meshing of the gear train 7 (gear 9, gear shafts 10, 11, intermediate gear 12, gear shaft 13, reel gear 25a) to wind the tape 27 and move the tape path to the solid line position. Bring it back. Therefore, the small tape cassette 23 can be taken out from the adapter 1 in this state.

As described above, according to the tape cassette adapter of the present invention, the axial cross-sectional shape of the tooth tip of the intermediate gear, which is swingably provided in the adapter and is fitted to one reel shaft of the recording/reproducing device, is circular. Because it is arc-shaped, even though there is some rocking play when the intermediate gear is fitted to the reel shaft of the recording/reproducing device, the intermediate gear maintains a good meshing condition with only a slight change in the meshing angle with respect to other gears. It has the advantage of being able to maintain good gear transmission.

[Brief explanation of the drawing]

1 and 2 are a partially cutaway plan view and a vertical sectional view taken along the line - in FIG. 1, respectively, of an embodiment of the small tape cassette adapter according to the present invention, and FIGS. FIG. 5 is a vertical cross-sectional view of the main part of the adapter and an enlarged vertical cross-sectional partial view of the main part, and FIG. 5 is a perspective view of the small tape cassette. 1...Adapter, 5, 6...Loading arm, 7...Gear train, 8...Operation knob, 12...Intermediate gear, 12a...Disc gear, 21...Ball bearing, 23...Small tape cassette, 2
5, 26...Reel, 32...Tape pass, 3
3, 34...Reel axis.

Claims (1)

[Scope of utility model registration request] A small tape cassette adapter used when a tape cassette smaller than a standard tape cassette is installed in a recording/playback device for the standard tape cassette, which fits onto one reel shaft of the recording/playback device during the installation. The intermediate gear that transmits the rotation of the reel shaft to the take-up reel of the small tape cassette is supported so as to be swingable about the central axis thereof, and the axial cross-sectional shape of the tips of the intermediate gear is circular. An adapter for small tape cassettes formed in an arc shape.