JPH0594653A - Reel device for tape recorder - Google Patents

Abstract

PURPOSE:To correctly mount a tape cassette even when a reel hub is eccentric by forming one part of a conical surface to be continued to a conical surface formed with driving claws on an upper surface of a reel cap. CONSTITUTION:The reel cap 3 having an outer diameter that is larger than an outer diameter of a reel shaft 2 is equipped on the top of the reel shaft 2 provided on a reel base 1 to be driven by a motor. Moreover, the device is equipped with the driving claws 4 for driving the reel hub Dc of the tape cassette D by rotating almost integrally with the reel shaft 2 in the rotating direction under freely slidable movement in the axial center direction of the reel shaft 2 and a reel spring 5 for energizing these claws 4 towards the reel cap 3. One part of the conical surface 4a to be continued to the conical surface 3a formed on the upper surface of the reel cap 3 is formed by these driving claws, and an outer circumference of the reel cap 3 is fitted with play into a min. diameter part 4b of this conical surface 4a as an inner diameter, and an abutting part 4c is equipped in this inner circumference to be abutted against the reel cap 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel device for a tape recorder which uses a tape cassette having no opening for driving a reel hub on one side.

[0002]

2. Description of the Related Art In recent years, audio equipment has tended to be digital audio, and with the development of technology, a tape recorder with high fidelity by digital recording and digital reproduction has been developed, and R-DAT by a rotary head and S-by a fixed head. DA
Two schemes of T have been proposed. Especially S-DAT
Because of the fixed head, the structure of the head and the tape cassette is similar to the analog tape recorder that is widely used at the present time, so that one tape recorder can record and reproduce both analog and digital signals. Is expected to be commercialized.

The currently proposed tape recorder of the type capable of recording and reproducing both analog and digital signals is configured so that a tape cassette as shown in FIG. 3 can be shared. That is, a conventional analog tape cassette A having a thickness Aa at a portion having a front opening for inserting a magnetic head and a pinch roller as shown in FIG. A digital tape cassette D of a shutter Da for covering the front opening for inserting the magnetic head and the pinch roller when not in use and sliding the magnetic tape in the traveling direction of the magnetic tape or in the opposite direction to open the front opening when in use. Both tape cassettes can be installed in the same tape recorder.

By the way, in the above-mentioned conventional analog tape cassette A, openings Ab are provided on both sides for reel driving. For this reason, most reel devices for tape recorders have a sufficient margin in the height direction and are of a type that penetrates the tape cassette. An example of the conventional reel device of a tape recorder will be described below with reference to the drawings.

FIG. 4 shows a reel device of a conventional tape recorder. In the figure, reference numeral 21 is a reel base driven by a motor (not shown) through gears and the like.
Reference numeral 2 is a reel shaft, and 23 is a reel cap which is press-fitted into the reel shaft 22 to be integrated. Reference numeral 24 is a drive claw for driving the reel hub of the tape cassette. The drive claw 24 is slidably guided and held by the reel shaft 22 only in the thrust direction so as to rotate substantially integrally. The reel spring 25 biases the reel cap 23 toward the reel cap 23, and the reel cap 23 prevents the reel cap 23 from falling off. Here, the reel device is configured to penetrate through the opening Ab formed in the tape cassette A,
The drive claw 24 is the reel hub A of the tape cassette A.
As shown in the drawing, the upper end 23 of the conical surface 23a of the reel cap 23 faces the pin Ad of c.
b penetrates to the upper surface side of the tape cassette A.

[0006]

However, in the case of the reel device of the conventional tape recorder as described above, in the case of the above-mentioned digital tape cassette D of FIG. 3 (b), as shown in FIG. Since the opening Db for driving the reel is formed only on one side of the lower surface, in order to deal with this,
The entire reel device must be lowered. Therefore,
As shown in FIG. 5, by merely lowering the reel cap 23, when the tape cassette D is loaded, the pin Dd portion of the reel hub Dc abuts on the flat portion of the upper end 23c of the reel cap 23. However, there was a problem that it could not be loaded correctly. Further, as shown in FIG. 6, when the pin Dd of the reel hub Dc enters between the reel cap 23 and the drive claw 24, the opening Db of the tape cassette D does not penetrate, so that this There was a problem that it would fall into a fatal situation that the tape cassette could not be taken out.

In view of the above-mentioned problems of the prior art, the present invention is a re-reader.
Even if the tape recorder is compatible with a new type of tape cassette that has only one side with an opening for driving the tape, it does not cause a problem when the tape cassette is loaded. -The purpose of the invention is to provide an electronic device.

[0008]

In order to solve the above-mentioned problems, a reel device of a tape recorder according to the present invention comprises a reel base driven by a motor and a reel shaft provided on the reel base. , A reel cap fixed to the upper end of the reel shaft and having an outer diameter larger than the outer diameter of the reel shaft, and the reel cap is slidable in the axial direction of the reel shaft and rotates substantially integrally with the reel shaft in the rotation direction. Drive hook for driving the reel hub of the tape cassette, and a reel spring for biasing the drive hook toward the reel cap. The drive hook is a conical surface continuous with the conical surface formed on the upper surface of the reel cap. And a part of the conical surface is used as an inner diameter and is loosely fitted to the outer periphery of the reel cap,
An abutting portion that abuts the reel cap is provided on the inner periphery thereof.

Further, the top end of the conical portion of the driving claw is formed to be located above the bottom end of the conical portion of the reel cap, and the pawl portion of the driving claw faces the pin of the reel hub when the tape cassette is loaded. It is configured.

Further, the smallest diameter of the conical surface at the uppermost end of the drive claw is smaller than the smallest distance when the pin tip of the reel hub of the tape cassette comes closest to the center of rotation of the reel. ..

[0011]

According to the present invention, when the tape cassette is loaded, the pin of the reel hub is guided while contacting the conical surface of the drive pawl, and when the tape cassette is completely loaded, the pin is guided around the outer periphery of the drive pawl. Therefore, no matter how eccentric the reel hub is, it can be loaded correctly.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a reel device for a tape recorder according to the present invention will be described in detail below with reference to FIGS. FIG. 1 shows a tape recorder according to the first embodiment of the present invention.
FIG. 2 is a partial cross-sectional view of the reel device of the da and the digital tape cassette D whose one side is closed, and FIG. 2 is a cross-sectional view of the loaded state.

In FIG. 1, reference numeral 1 is a reel base driven by a motor (not shown) through gears, and 2 is a reel shaft provided on the reel base 1.
A reel cap 3 is press-fitted and integrally fixed to the upper end of the reel cap 3. The reel cap 3 has an outer diameter larger than the outer diameter of the reel shaft 2a of the mounting portion. A driving claw 4 is slidably guided and held on the reel shaft 2 only in the thrust direction, and is configured to rotate substantially integrally with the reel shaft 2 to drive the reel hub Da of the tape cassette D. There is. Reference numeral 5 is a reel spring for urging the drive pawl 4 toward the reel cap 3.

Here, the drive claw 4 forms a part of a conical surface 4a which is continuous with the conical surface 3a formed on the upper surface of the reel cap 3, and the conical surface 4a has an uppermost end 4b having the smallest diameter. With the inner diameter as the inner diameter, the reel cap 3 is loosely fitted to the outer periphery of the reel cap 3, and the inner periphery of the reel cap 3 is formed with a contact portion 4c that abuts against the reel cap. The radius L1 of the uppermost end 4b of the drive pawl 4 is the minimum from the center of rotation of the reel when the reel hub Dc is eccentric by the maximum amount of play play to the tip of the pin Dd of the reel hub Dc. It is configured to be smaller than the distance L2.

Further, the drive claw 4 has a lower inner circumference 4d formed in a hexagonal sectional shape so as to rotate integrally with the reel shaft 2, and is fitted with a hexagonal column portion 2b of the reel shaft 2. Have been combined. The difference (H1-H2) between the thrust range movable range H1 of the drive claw 4 and the dimension H2 from the uppermost end 4b of the conical portion 4a of the drive claw 4 to the contact portion 4c (H1-H2) is the tape that engages with the drive claw 4. Diameter H of pin Dd of reel hub Dc of cassette D
It is configured to be 3 or less.

Further, the conical portion 4a of the drive claw 4 has the uppermost end 4b.
Is formed so as to be located above the lowermost end of the conical portion 3a of the reel cap 3, and the pawl portion 4e of the drive pawl 4 faces the pin portion Dd of the reel hub Dc when the tape cassette D is loaded. Further, the conical portion 4a of the drive claw 4
And the inclination angle of the conical portion 3a of the reel cap 3 are substantially equal to each other.

The operation of the reel device of the tape recorder thus constructed will be described below.

In the tape cassette D, the reel hub D
Since c is constructed with play in the radial direction,
When the reel hub Dc is eccentric due to the weight of the tape and is about to be loaded, the tip portion of the pin portion Dd of the reel hub Dc contacts the conical surface 4a of the drive pawl 4, and While pressing 4 is guided and loaded. At this time, due to the relationship of the above dimension L1 <L2, the tip of the pin portion Dd of the reel hub Dc is guided without riding on the flat upper end portion of the reel cap 3.

Further, as described above, the dimensions (H1-H2)
Due to the relationship of <H3, even if the tape cassette D is eccentric to a predetermined loading position or more and the pin Dd of the reel hub Dc comes into contact with the conical surface 3a of the reel cap 3, the reel hub is not supported. The tip of the pin portion Dd of Dc is not pinched between the lower end of the reel cap 3 and the uppermost end 4b of the drive claw 4.

As described above, according to this embodiment, when the tape cassette is loaded, no matter how eccentric the reel hub is, the reel hub is correctly loaded, or at least a fatal situation as in the conventional example is avoided. It will be possible.

[0021]

As described above, according to the present invention, even in a tape recorder corresponding to a new type tape cassette having a reel driving opening on only one side, the tape cassette can be loaded. At any time, no matter how eccentric the reel hub is, it is at least possible to avoid a fatal situation such that the reel hub is properly loaded or the tape cassette cannot be taken out as in the conventional example.

[Brief description of drawings]

FIG. 1 is a sectional view of a reel device for a tape recorder according to a first embodiment of the present invention.

FIG. 2 is a sectional view of the same tape cassette installed

FIG. 3A is a perspective view of an analog tape cassette,
(B) is a perspective view of the digital tape cassette

FIG. 4 is a sectional view of a reel device of a conventional tape recorder in a tape cassette mounted state.

FIG. 5 is a sectional view showing the improved type.

FIG. 6 is a sectional view showing a defective state of the improved type.

[Explanation of symbols]

 1 reel stand 2 reel shaft 3 reel cap 4 drive claw 5 reel stand spring

Claims (5)

[Claims] 1. A reel base driven by a motor,
A reel shaft provided on the reel base, a reel cap fixed to the upper end of the reel shaft and having an outer diameter larger than the outer diameter of the reel shaft, and a rotation direction that is slidable in the axial direction of the reel shaft. Is provided with a drive claw that rotates almost integrally with the reel shaft to drive the reel hub of the tape cassette, and a reel spring that biases the drive claw toward the reel cap. The drive claw is provided on the upper surface of the reel cap. A part of a conical surface which is continuous with the formed conical surface is formed, and the conical surface having the smallest diameter is used as an inner diameter to be loosely fitted to the outer periphery of the reel cap, and the inner periphery of the conical surface that contacts the reel cap. A reel device for a tape recorder, which is provided with a contact portion. 2. The upper end of the conical portion of the drive pawl is formed to be located above the lowermost end of the conical portion of the reel cap, and the pawl portion of the drive pawl faces the pin of the reel hub when the tape cassette is loaded. 2. The structure according to claim 1, wherein
Reel device of the tape recorder described. 3. The smallest diameter portion of the conical surface at the uppermost end of the drive claw is smaller than the smallest distance when the tip of the pin of the reel hub of the tape cassette comes closest to the center of rotation of the reel. The reel device of the tape recorder according to claim 1 or 2. 4. A tape cassette reel that engages with the drive claw by the difference (AB) between the thrust movable range A of the drive claw and the dimension B from the uppermost end of the conical portion of the drive claw to the contact portion. 4. The reel device for a tape recorder according to claim 1, wherein the reel device has a pin diameter C or less. 5. The teeth according to claim 1, wherein the inclination angle of the conical portion of the drive claw and the inclination angle of the conical portion of the reel cap are substantially equal. -Precoder reel device.