JPS58220282A - Miniature tape cassette adaptor - Google Patents

Abstract

PURPOSE:To cut off the undesired load within an adaptor and to improve the operability when a tape is driven, by connecting an intermediate rotary member to a take-up reel via a revolving mechanism and having non-connection between the intermediate rotary member and a rotary member in the modes excepting a rewind mode. CONSTITUTION:The operating force of an operation knob 8 of a miniature tape cassette adaptor 1 is transmitted to take-up reels 25 and 26 of a miniature tape cassette 23. Thus transmission gears 9-13 set a tape 27 back to a position within a cassette from a position inside the adaptor 1. Then the engagement with an intermediate gear 12 is released when other gears connected to the gear 12 connected to a driving reel shaft of a recording/reproducing device. As a result, the gears outside a transmission line formed between the gear 12 and the driving reel shaft have no revolution when the tape 27 is driven by driving the driving reel shaft at a video recording/reproducing speed. Thus no driving load is produced for the driving reel shaft.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an adapter for small tape cassettes, which improves operability by removing unnecessary loads within the adapter when the adapter is attached to a standard tape cassette recording and reproducing device to drive the tape. The purpose of the present invention is to provide an adapter for a small tape cassette that can improve the performance of the tape cassette. ' Figures 1 and 2 are a partially cutaway plan view and a partially cutaway plan view of an embodiment of a small tape cassette adapter according to the present invention, respectively.
It is a longitudinal cross-sectional view along the line ■-■ in the figure.

In the figure, an adapter 1 for a small tape cassette has substantially the same external dimensions as a standard tape cassette.

Loading arms 5 and 6 have a small tape cassette storage section 2 inside and have poles 3 and 4 at their tips, respectively.
(rotating around pins 5 a' and 6 a, respectively),
and a gear train 7 etc. are incorporated.

As shown in FIG. 3, in the loading arm 5, a special chain 44 consisting of three links 41 to 43 is connected to a vertical pin 5b via pins 45 and 46, and the right end of the link 43 is connected to a gear 9 which will be described later. Cam pin 9a fixed to the bottom surface
connected to. Further, the bottles 45, 46, 9a travel while being guided by a J-shaped guide groove 15a of the lower fixing plate 15, which will be described later.

The gear train 7 includes a gear shaft 10 (having a one-way pawl clutch between a small diameter gear 10a and a large diameter gear 10b), a gear shaft 10 (having a one-way pawl clutch between a small diameter gear 10a and a large diameter gear 10b), and a gear shaft 11 (a small diameter gear 11a and a large diameter gear llb) that rotate together with the operation knob 8. ), intermediate gear 12 (disc gear 1
2a, having an inner peripheral fitting part 12b), a gear shaft 13 (having a small diameter gear 13a and a large diameter gear 13b), and a gear 9. The gear shaft 10.11 has approximately a pair of upper and lower fixed plates 14.15.
The intermediate gear 12 is supported only by the upper fixed plate 14 via a ball bearing, and the gear shaft 13 is supported between the fixed plate 14 and the lower plate 18 of the adapter 1.

Here, the gear shaft 11 is supported by a tip shaft 47a of a rotary lever 47 as shown in FIG. The large diameter gear llb is energized in the direction of the disk gear 12.
It is press-fitted with a. At this time, the inclined cam portion 47b integrally formed on the rotary lever 47 overlaps the end of the guide groove 15a.

23 is a small tape cassette, as shown in Figures 2 and 5.
It has a magnetic tape 27 wound between a pair of reels inside the plow body 24, and further has a lid 29 on the front surface that rotates upward by 90° about a pin 28 as a fulcrum. %] IJ-
The reel 25 has a reel gear 25a on the outer periphery of the lower flange, and is supported by the housing 24 without any slippage through a pin 30, and the reel 26 has a fitting part 26a and is loosely fitted into the lower hole 248 of the housing 24. Ru.

Next, the attachment of the small tape cassette to the adapter and the attachment to the recording/reproducing apparatus will be explained.

The small tape cassette 23 is stored in the storage part 2 of the adapter 1 shown in FIG. 1 (loading arms 5 and 6 are in the unloading position shown by the east line in the figure) 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.

Subsequently, the operating knob 8 is manually rotated clockwise in FIG. 1, that is, in the direction of the arrow, over a total angular range of 210 degrees, for example. Then, the gear 9 rotates as a unit, as shown in Fig. 4.
The cam pin 9a and the pins 45, 46 of the special chain 44 travel while being guided by the guide groove 15a. Therefore,
The loading arm 5 is connected to the third
Rotate clockwise from the diagram to the loading position shown in Figure 4. At this time, when the cam pin 9a in FIG. 4 rotates the last 15 degrees of the 210 degree rotation, the rotation lever 47
The rounding and rotating lever 47 contacts the inclined cam portion 47b of the disk and is sequentially suppressed and displaced, and the rotating lever 47 rotates slightly counterclockwise against the torsion spring 49, causing the large-diameter gear llb to escape from the disk gear 12a and be displaced. Release the mesh. Rotating lever 47
is biased clockwise by the torsion spring 49 in the state shown in FIG. 4, but the operating knob 8 is locked by a ball (both not shown) being press-fitted into its engagement groove. , is held in the position shown in the figure.

Simultaneously with the clockwise rotation of the arm 5, the arm 6 also rotates counterclockwise via a link and a gear train (both not shown) to reach the position shown by the dashed line in FIG. As a result, the tape 27 in FIG. 1 is pulled out from its position in the small tape cassette by the ball 3.4, forming the tape path 32 on the front surface 111 of the standard tape cassette at the end. During this period, the small diameter gear 10a meshing with the gear 9 is also rotating counterclockwise in FIGS. 1 and 3, but the large diameter gear 10b does not rotate due to the action of the one-way pawl clutch, so The rotational force from the operation knob 9 is not transmitted, 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 device, the cassette housing is pushed down. Then, the adapter l moves downward, and as shown in FIG. 2, the fitting portion 12b of the intermediate gear 12 and the fitting portion 26a of the reel 26 are fitted to the pair of reel shafts 33 and 34 of the recording/reproducing device, respectively, so that they can rotate together. be done.

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, and reel gear 25a are sequentially activated to rotate the reel 25 clockwise, and the tape 27 is run in the direction of arrow A in FIG. 1 to perform the recording or reproduction described above.

At this time, the gear shaft 11 is displaced from the intermediate gear 12 and the gears llb, 1';a are disengaged, and the unnecessary load for rotating the gear shaft 11 and the gear 10b is removed. Also, when rewinding the tape, the reel shaft 34 (reel 26) on the left side in FIG. 2 is driven to rotate counterclockwise.
The tape 27 is run at high speed in the direction of arrow B in FIG. Also at this time, the meshing of gears llb and 12a is released.

Next, a description will be given of how to remove the small tape cassette 23 after taking out the adapter 1 from the cassette housing. First, rotate the operation knob 8 counterclockwise to return it to the position shown in two-dot chain line in FIG. Then, the arm 5 returns to the unloading position shown by the solid line from the position shown by the chain double-dashed line in the same figure via the special chain 44, and the arm 6 similarly returns to the position shown by the solid line. During this period, when the operating knob 8 returns to the counterclockwise rotation by 15 degrees, the cam bin 9a is moved to the inclined cam portion 47b of the rotating lever 47.
Since the rotating lever 47 is rotated clockwise again by the torsion 9 spring 49, the large diameter gear Ilb is returned to be pressed into contact with the disc gear 12B.

Therefore, when the operation knob 8 returns to rotation beyond the above 15 degrees, the reel is rotated via the gear train 7 (gear 9. gear shaft 10° 11, intermediate gear 12.'!'I gear shaft 13. reel gear 25a). 25 starts rotating clockwise and the tape 27
- Wind and pull back to return the tape path to the solid line position.

Therefore, it is sufficient to take out the small tape cassette 23 from the adapter l in this state.

As described above, according to the small tape cassette adapter of the present invention, the transmission gear train transmits the operating force of the operating knob to the take-up reel of the small tape cassette and pulls the tape back from the position inside the adapter to the position inside the cassette. Of these, the other gears that mesh with the intermediate gear that is coupled to the drive reel shaft of the recording/reproducing device are configured to disengage from the intermediate gear when the gear is coupled, so that the drive reel shaft is not driven. When the tape is run at a recording or playback speed, etc., the gears other than the intermediate gear and the transmission line between the drive reel shafts in the transmission gear train do not rotate and do not become a load for driving the drive reel shaft. . Therefore, the driving reel shaft has the advantage of being able to operate smoothly with a light load and improving operability.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 and 2 are a partially cutaway plan view and a vertical cross-sectional view taken along the line -■ in FIG. , 3 and 4 are plan views of the adapter and its operating state, respectively, and FIG. 5 is a perspective view of the small tape cassette. 1...Adapter, 5.6...Loading arm,
7... Gear train, 8... Operation knob, 9-13... Gear, 9a... Cam bin, 23... Small tape cassette, 25.26... Reel, 33.34... Reel shaft, 44...Special chain, 47...Rotating lever,
47b... Inclined cam part.

Claims (1)

[Claims] 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, the tape being inserted into the small tape cassette from a position within the cassette to a predetermined position within the adapter. The tape loading arm that is pulled out to the position and the operating means that makes the arm reciprocate are pulled out!
- a transmission mechanism that applies the operating force of the operating means to the take-up reel in the cassette through a rotating member and an intermediate rotating member in order to perform a predetermined pulling back of the tape into the cassette; An adapter for a small tape cassette, characterized in that the cough intermediate rotating member is connected to the take-up reel via a rotating mechanism, and is configured not to be connected to the rotating member except for the pulling-back operation.