JP2553278Y2 - Reel table of tape recorder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel table of a tape recorder, and more particularly, to prevent a tape from becoming loose due to rotation in a reverse direction due to a mode conversion in which a supply reel or a winding reel is driven in one direction. The present invention also relates to a reel table of a tape recorder having an improved structure.

[0002]

2. Description of the Related Art Generally, in a tape recorder such as a VTR or DAT, a supply reel table on which a reel of a tape cassette is seated, and a wound reel table on which a driven reel is rotated by inertia due to the inertia of a drive reel. Braking equipment will be installed to prevent unraveling.

When the power for driving the drive reel is released, the brake equipment brakes the reel table on which the driven reel is seated. However, at this time, the drive reel is rotated in the opposite direction by the reaction force due to the braking force of the brake device.
Therefore, the tape wound around the drive reel can be unwound. FIGS. 1 to 4 show a conventional reel table for preventing the above-described tape unwinding state.

FIG. 1 shows reel tables 40 and 50 on which tape reels (not shown) are seated. And FIG.
FIG. 3 is a partially cutaway plan view of the supply reel table 50, and FIG. This is a reel disk 10 on which a tape reel (not shown) is seated, a drive gear 30 in which an idler 35 for transmitting power is selectively engaged, and a brake member 21 provided between the reel disk 10 and the drive gear 30. And a braking gear 20 for performing a braking function. An annular extension 10 ′ is formed on the bottom surface of the reel disk 10.
An annular groove 22 is formed in the brake gear 20, as shown in FIG. A friction felt 43 is provided between the braking gear 20 and the driving gear 30, and a spring 41 for pushing the braking gear 20 to the driving gear 30 is provided on the shaft 41.
2 are combined. The reel disk 10 and the drive gear 30 are installed by being pushed into a shaft 41, and the braking gear 20 is installed so as to be able to slip on the shaft 41. Here, an annular brake controller 60 that is narrower than the width of the groove 22 is pushed into the annular groove 22 of the braking gear 20. On the inner wall of the brake controller 60, inclined grooves 61 are formed at predetermined intervals. A spring 6 is provided on the narrow wall of the inclined groove 61.
One end of the spring 3 is fixed, and the ball 62 is fixed to the other end of the spring 63. On the other hand, referring to FIGS. 2 and 3, the inclined directions of the inclined grooves 61 of the brake controller 60 provided in the supply reel table 50 and the winding reel table 40 are formed in opposite directions.

An extension 10 'of the reel disk 10 is interposed in a space between the inner wall of the brake controller 60 and the inner wall of the annular groove 22. In such a configuration,
For example, each of the reel tables 40 and 50 is rotated clockwise by a PLAY operation in which the idler 35 and the drive gear 30 of the winding reel table 40 are engaged with each other and driven. At this time, as shown in FIGS.
The ball 62 provided in the reel is compressed by the wall of the inclined groove 61 and the extension 10 ′ of the reel disk 10, and the ball 62 provided in the reel table 40 is compressed by the wall of the inclined groove 61 and the extension of the reel disk 10. Move away from 10 '. Thereafter, at the time of mode conversion, the idler 35 is separated from the drive gear 30 and the brake member 21 is moved to the brake gear 20 of the supply reel table 50.
When it engages, the winding reel table 40 is rotated counterclockwise by the reaction of the braking force. However, at this time, the ball 62 provided in the winding reel table 40 is squeezed by the wall of the inclined groove 61 and the extension 10 ′ of the reel disk 10 to prevent the rotation of the reel disk 10. Therefore, it is possible to prevent the tape from being unraveled at the time of mode conversion.

However, in the reel table having such a structure, the brake controller 60 has many requirements such as the ball 62 and the spring 63, so that the number of assembling steps is large and the cost of the product is increased. In particular, when the reel tables 40 and 50 are rotated at a high speed, there is a problem that noise is generated due to the vibration of the ball 62.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tape recorder reel table in which the above problems are solved. More specifically, it is an object of the present invention to provide a tape recorder reel table which has a simple structure and has no noise despite the high speed rotation of the reel table.

[0008]

According to the present invention, there is provided a reel disk on which a tape reel is seated.
A drive gear rotated and driven by a predetermined power, a reel table of a tape recorder provided with a braking gear interposed therebetween and performing a braking function by a brake member, interposed between the reel disk and the braking gear,
A tape recorder, wherein one end is fixed to a reel disk and the other end is provided with a coil spring fixed to a braking gear, and the spring comes into close contact with or drops off from the braking gear depending on the rotation direction of the reel disk. Reel table.

[0009]

The reel table of the tape recorder according to the present invention is provided with a coil spring 74 whose inner diameter is enlarged or reduced only by the rotation direction to prevent the tape from being unraveled.

[0010]

Referring to FIGS. 5 and 6, reference numeral 70 indicates a reel table 70 according to the present invention. This is a reel disc 71 on which a tape reel (not shown) is seated.
And a drive gear 73 with which an idler 76 for transmitting power selectively meshes, a reel disc 71 and a drive gear 73.
, And a braking gear 72 that is braked by a brake member 75. An annular extension 71 'is formed on the bottom surface of the reel disk 71. The brake gear 72 has an annular groove 72 ′. A friction felt 77 is provided between the braking gear 72 and the driving gear 73, and a spring 80 for pressing the braking gear 72 to the driving gear 73 is connected to the shaft 90. The reel disc 71 and the driving gear 73 are installed by being pushed into a shaft 90, and the braking gear 72 is installed so as to be able to slip on the shaft 90. Here, an extension 71 'of the reel disc 71, which is narrower than the width of the groove 72', is inserted into the annular groove 72 'of the braking gear 72. The inner wall 72b of the annular groove 72 'of the braking gear 72 and the extension 7 of the reel disc 71
A coil spring 74 is interposed between 1 '. One end of the coil spring 74 is fixed to the extension 71 'of the reel disc 71, and the other end is fixed to the inner wall 72b of the groove 72'. At this time, the coil spring 74 is connected to the extended portion 71 'of the reel disc 71 and the outer wall 72 of the annular groove 72'.
a.

In such a configuration, for example, the supply reel table (not shown) and the winding reel table 70 are rotated clockwise in a reproducing operation in which the idler 76 and the driving gear 73 of the winding reel table 70 are engaged and driven. . At this time, since the reel disk 71 and the braking gear 72 are rotated in the same direction, the inner diameter of the spring 74 does not change.

Thereafter, when the mode is changed from the reproduction mode to the stop mode or the rewind mode, the idler 76 is driven by the drive gear 73.
, The rotation of the brake gear 72 of the winding reel table 70 is stopped by the brake member 75. At this time, the reel disk 71 tries to rotate in the counterclockwise direction due to the reaction due to the braking force. At this time, one end of the coil spring 74 fixed to the braking gear 72 is stopped, and the other end fixed to the extension 71 'of the reel disc 71 is rotated counterclockwise. At the same time, the coil spring 74
The inner wall 72b of the annular groove 72 'is reduced while its inner diameter is reduced.
Squeezed. Therefore, the reel disk 71 is stopped by being brought into close contact with the braking gear 72 by the coil spring 74. Accordingly, it is possible to prevent the tape from being unraveled from a winding reel (not shown) seated on the winding reel table 70.

On the other hand, a supply reel disk (not shown) has the same configuration as the winding reel disk 70, except that the winding direction of the coil spring 74 is different. Therefore, STO in REW mode or REV mode
The description of the operation at the time of mode conversion in the P mode or the PLAY mode is similar to that of the above-described embodiment, and thus a detailed description is omitted.

[0014]

As described above, the reel table of the tape recorder according to the present invention is provided with the coil spring 74 whose inner diameter is enlarged or reduced only by the rotation direction, thereby preventing the tape from being unwound. Therefore, the reel table according to the present invention has a simpler structure than the conventional reel table having a braking controller composed of a ball and a spring, and does not generate noise despite high-speed rotation.

As described above, the present invention provides a reel table of a tape recorder that can reduce production and assembly time and production cost.

[Brief description of the drawings]

FIG. 1 is a partially cutaway sectional view showing a conventional supply reel table or winding reel table.

FIG. 2 is a partially cutaway plan view of the supply reel table of FIG. 1;

FIG. 3 is a partially cutaway plan view of the winding reel table of FIG. 1;

FIG. 4 is a schematic sectional view showing a conventional braking gear.

FIG. 5 is a partially cutaway sectional view showing the winding reel table of the present invention.

FIG. 6 is an exploded perspective view of an important part of the winding reel table of FIG. 5;

[Explanation of symbols]

 71 Reel disk 72 Brake gear 73 Drive gear 74 Coil spring 75 Brake member

Claims (1)

(57) [Scope of request for utility model registration] 1. A reel for a tape recorder comprising a reel disk on which a tape reel is seated, a driving gear rotated and driven by a predetermined power, and a braking gear interposed therebetween and performing a braking function by a brake member. In the table, there is provided a coil spring interposed between the reel disk and the brake gear, one end of which is fixed to the reel disk, and the other end of which is fixed to the brake gear, and the spring is connected to the brake gear depending on the rotation direction of the reel disk. A reel table for a tape recorder, wherein the reel table comes into close contact or falls off.