JPS6113311B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape cassette adapter, which allows a cassette with a narrower distance between reels and a smaller external shape than an ordinary tape cassette to be adapted to the deck of an ordinary tape cassette. This is what I did.

Figure 1 shows a normal VHS video cassette and a small cassette. 1 is a VHS video cassette, 2 is a take-up reel, 3 is a supply reel, 4 and 5 are tape guides, and 6 is whether or not there is a tape. The detection mechanism 7 is a tape. Also, 8 is a small cassette, 9 is a take-up reel, 1
0 and 11 are tape guides, and 12 is a tape.
Compared to the size of a normal video cassette 1, the distance between the reels of the small cassette 8 is narrower than that between the reels 2 and 3 and between the reels 3 and 9. Naturally, the length of the tape will also be shorter, and if the longest cassette is usually 120 minutes long, then
It takes about 20 to 30 minutes, but since it is a small cassette, a small system can be created by installing a dedicated small deck. If the small cassette 8 is installed on the deck of the normal cassette 1, the distance between the reels will naturally be different, and the supply reel 3 will be in the same position.
On the take-up reel side, an adapter is required to transmit the drive of the take-up reel 9 of the small cassette to the take-up reel 2 of the normal cassette 1 via the idler 13. The tape 12 must also be pulled out from the small cassette so that the tape guide positions are moved as shown by arrows 14 and 15, respectively.

The present invention has been made in view of this point, and is designed to fit into a shaft provided in a second cassette with a smaller distance between the reels than the first cassette, and to form teeth around the flange. The take-up reel is configured to be driven by a take-up gear wheel that engages with the reel drive shaft of the deck for the first cassette via an idler gear that meshes with the teeth of the take-up reel, and the idler gear The apparatus includes an elastic member that is elastically crimped to the take-up gear wheel, and a stopper wheel that is formed into a substantially pitch circle so that the idler gear and the take-up gear do not contact each other at the bottoms of their teeth.

The present invention will be described below based on drawings showing embodiments. First, the first embodiment shown in FIGS. 2 and 3 will be described. Reference numeral 16 indicates an adapter of the same size as a normal video cassette, and reference numeral 17 indicates a small cassette. has a gear 18a,
A shaft (not shown) provided inside the cassette 17 is rotated. The supply reel 19 engages with the supply reel shaft of a normal deck in the same way as a normal cassette. 20 is an idler that meshes with the gear 18a; this idler 20 meshes with the gear 18a;
The gear 20a meshing with the gear 2 of the winding gear wheel 21
It has a gear 20b that meshes with the gear 1a. The take-up gear wheel 21 normally engages with a take-up reel shaft of a deck. The idler 20 has a stopper wheel 20c made of a pitched circle of a gear 20b, and the take-up gear wheel 21 also has a stopper wheel 21b made of a pitched circle of a gear 21a. Furthermore, the idler 20 is connected to a support shaft 2 provided on the adapter.
2 as an axis by an arm 23. This arm 23 is biased in the direction of arrow 25 by a spring 24. Further, the winding gear wheel 21 has a spring 2
6 is biased downward. The tape 27 is pulled out to the positions of tape guides 28 and 29 by an adapter. FIG. 3 is a cross-sectional view of the meshing part, and the take-up gear wheel 21 normally engages with the reel take-up shaft 30 of the deck to transmit the take-up torque to the idler 20, and furthermore, the take-up reel 1
8 rotates the shaft of the cassette to wind up the tape, but since the winding gear wheel 21 has play when attached to the deck, its rotation is unstable. Especially when the tape is fast forwarded or rewound, it becomes extremely unstable. At this time, the meshing between the idler gear 20b and the gear 21a of the take-up gear wheel 21 becomes unstable, so they are biased by the spring 24, which is provided to stabilize the meshing at this time. are the stopper wheel 20c of the idler and the stopper wheel 21b of the take-up gear wheel 21. These stopper wheels 20c and 20b, which are formed by pitch circles of the respective gears, prevent the gears from biting into each other to the bottom and make it difficult to rotate, and ensure smooth rotation at all times. 31 is adapter 1
This is the No. 6 substrate. Next, a description will be given of the second embodiment shown in FIG. 4. This embodiment is one in which another mechanism is added to the configuration of the first embodiment. Reference numeral 32 denotes an idler. A stopper wheel 32a is provided, and a stopper wheel 33a is also provided on the side of the take-up reel 33, and each of the stopper wheels 32a, 33a is connected to the idler 32 and the gears 32b, 33b formed on the take-up reel 33. Consists of Pituchi yen,
This mechanism allows the take-up reel 33 and the idler 32 to rotate more smoothly, and even if there is a slight play between the adapter 16 and the small cassette 17, they can rotate without any problem. By the way, as shown in FIG. 4, a notched stopper 36 is provided on the base plate 38 of the adapter 16, and the idler shaft 34 is regulated by the stopper 35, so that the idler 32 can be bitten deeply into the take-up reel 33 to the bottom of the tooth. By avoiding this, smoother rotation can be obtained. Furthermore, by providing a stopper 37 on the base plate 38 of the adapter for regulating the take-up reel shaft, the idler 32 and the take-up reel 3 can be
3 between the shafts, smoother rotation can also be obtained.

The tape cassette adapter of the present invention can be implemented as described above, and the following effects can be obtained. That is, in a magnetic recording/reproducing device, especially a video tape recorder, unless the video tape runs smoothly and extremely stably, the image will be distorted. The transmission of the winding torque from the adapter to the small cassette is then very important. The present invention can solve such problems,
It became possible to play from a small cassette on a regular deck via an adapter.

[Brief explanation of the drawing]

Fig. 1 is a comparative view of the external appearance of a normal cassette and a small cassette, Fig. 2 is a perspective view showing the first embodiment of the present invention, Fig. 3 is an enlarged cross-sectional view of the same main part, and Fig. 4 is a diagram showing the first embodiment of the present invention. FIG. 2 is an enlarged sectional view of a main part showing a second embodiment. 16...Adapter, 17...Small cassette, 18...
Take-up reel, 18a...gear, 19...supply reel, 20...idler, 20a, 20b...
Gear, 20c...stopper wheel, 21...take-up gear wheel,
21a... Gear, 21b... Stopper wheel, 22... Support shaft, 23... Arm, 24, 26... Spring, 27... Tape, 28, 29... Tape guide, 30... Reel winding shaft, 32... Idler, 32a... Stopper wheel ,
32b...gear, 33...take-up reel, 33
a...stopper wheel, 33b...gear, 34...idler shaft, 35...stopper, 36...take-up reel shaft, 37...stopper.

Claims (1)

[Claims] 1. A take-up reel that fits into a shaft provided in a second cassette with a smaller distance between the reels than the first cassette and has teeth formed around the flange. The reel drive shaft of the deck for the first cassette is driven by a take-up gear wheel that engages with the reel drive shaft of the first cassette deck through an idler gear that meshes with the teeth of the reel gear, and an elastic member that elastically presses the idler gear onto the take-up gear wheel. A tape cassette adapter comprising a member, and a stopper wheel formed of a substantially pitch circle so that the idler gear and the take-up gear do not touch each other at the bottoms of the teeth. 2. The tape cassette adapter according to claim 1, comprising a stopper wheel constituted by a substantially pitched circle of an idler gear and a take-up reel gear. 3. The tape cassette adapter according to claim 1, further comprising a stopper for regulating the distance between the idler gear and the take-up reel.