JPS599427Y2 - Tape reel support device for tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape reel support device for a tape recorder in which a pulley is formed at the joint between a reel receiver and a reel hub shaft.

For example, in a cassette-type tape recorder as shown in FIG. 1, a pair of tape reels in a tape cassette are supported by a pair of reel hub shafts 2a and 2b provided on the upper surface of a fixed base plate 1 of the tape recorder, and played back. By pressing the button 3a or by pressing the play button 3a and the record button 3b at the same time, the magnetic tape wound during both tape reeling is brought into contact with the magnetic head 4, and the tape is brought into contact with the capstan shaft 5.
It is supported by a vinci roller 6 and rotated by the rotation of a capstan shaft 5 to run at a constant speed in the right direction in the figure, thereby performing a playback or recording operation.

A constant speed drive pulley 8 is provided on the reel receiver 7a on the winding side.
are pressed against each other to rotate the reel hub shaft 2a counterclockwise in the drawing, and the magnetic tape fed out from between the capstan shaft 5 and the vinyl roller 6 is given an appropriate tension and wound onto the tape reel on the winding side. It will be done.

When the fast forward button 3C is pressed, the idler 9a comes into pressure contact with the reel receiver 7a on the winding side, and the rotational force of the flywheel 10 fixed to the capstan shaft 5 is applied to the reel receiver 7a on the winding side via the idler 9a. As a result, the reel hub shaft 2a rotates at high speed, and the magnetic tape is wound onto the tape reel on the winding side.

Similarly, when the rewind button 3d is pressed, the idler 9b comes into pressure contact with the reel receiver 7b on the supply side, and the idler 9a comes into pressure contact with the idler 9b, so that the rotational force of the flywheel 10 is transmitted through these two idlers 9a and 9b. The magnetic tape is transmitted to the reel receiver 7b on the supply side, the reel hub shaft 2b rotates at high speed, and the magnetic tape is rewound onto the tape reel on the supply side.

Such tape fast-forwarding or rewinding operations are often performed when searching for a specific tape position, and a counter 11 is usually used as a means to facilitate this search.

A pulley 12 is attached to the worm shaft of the counter 11, and this pulley 12 and a pulley 13 integrated with the upper surface of the supply reel receiver 7b are interlocked by an endless belt 14. The number of revolutions of the tape reel on the supply side is counted and displayed.

By the way, in this type of conventional device, the V-pulley 13 is integrally formed on the upper surface of the reel receiver 7b as shown in FIG. It is necessary to use a split mold that can be separated into left and right sides on a plane that includes the rotation axis, and as a result, the reel receiver 7b has poor roundness, and the joining line of the split mold remains on the belt hanging surface of the pulley. There was also the risk of damaging the belt.

Furthermore, when the pulley 13 is formed on the upper surface side of the reel receiver 7b, the height increases accordingly, which also has the disadvantage of hindering miniaturization of the tape recorder itself.

The present invention was developed in order to eliminate these conventional drawbacks, and the purpose is to form an annular groove in the joint part of the reel receiver and the hub shaft, and to make this part function as a pulley. It is an object of the present invention to provide a tape reel support device which enables manufacturing by cutting out a reel receiver and a reel hub shaft in the axial direction, and which enables miniaturization of a tape recorder by minimizing the height dimension.

That is, the tape reel support device of the present invention, as shown as an embodiment in FIG.
An upright support shaft 22, a disk-shaped reel receiver 23 rotatably supported by the support shaft 22, and the reel receiver 23.
It has a truncated conical protrusion 24 formed on the upper surface and a truncated conical protrusion 25 on the base end surface, and is fixed to the upper surface of the reel receiver 23 so that the conical surface of the protrusion 25 and the reel receiver are fixed to the upper surface of the reel receiver 23. 2
An annular groove 2 having a ■-shaped cross section is formed between the conical surface of the protrusion 24 of
6-shaped reel hub shaft 27.

Therefore, if the tape reel support device of the above structure is installed at the position of the supply side reel hub shaft 2b and the reel receiver 7b in the cassette type tape recorder shown in FIG.
An endless belt 14 is stretched around the reel 6, and the joint portion between the reel receiver 23 and the reel hub shaft 27 can function as a pulley.

When both the reel receiver 23 and the reel hub shaft 27 are molded with resin, they have a shape that can be cut out in the axial direction.
By manufacturing by die-cutting in the axial direction, it is possible to avoid joining lines of split dies on the belt contact surfaces, that is, the respective conical surfaces of the protrusions 24 and 25, and the belt can be made to last for a long time.

Furthermore, since no pulley is formed on the upper surface of the reel receiver as in the conventional case, the height dimension can be reduced, and the tape recorder can be made smaller.

Further details of the embodiment shown in FIG. 2 are as follows.

The support shaft 22 has a large diameter portion 22a at its base end, and the center portion of the lower surface of the reel receiver 23 abuts against the upper end surface of the large diameter portion to determine the height position of the reel receiver 23.

Further, an annular groove 22b is provided on the outer periphery of the tip end of the support shaft 22, and an E-ring 28 is fitted into this groove 22b to prevent the reel hub shaft 27 from coming off.

A rubber material 29 with a large friction coefficient is provided on the outer periphery of the reel receiver 23.
is attached, and the idler 9b in Figure 1 is attached to this rubber material 29.
This ensures reliable power transmission.

Further, a cylindrical boss portion 30 is protruded from the center of the upper surface of the protruding portion 24, and a pair of spring pieces 31 and 31 are protruded from the upper end surface of the boss portion 30. The reel hub shaft 22 is elastically pressed against the outer periphery of the reel hub shaft 22 to apply an appropriate braking force to the rotation of the reel hub shaft 27.

Accordingly, this braking force applies an appropriate tension to the tape fed out from the tape reel on the supply side, and it is possible to prevent problems in the playback and recording operation conditions due to loosening of the tape.

On the other hand, the inner diameter of the tip of the reel hub shaft 27 is
The inner diameter of the lower part is made large enough to accommodate the spring pieces 31, 31, and the inner diameter of the proximal opening is made slightly larger than the outer diameter of the boss part 3.
It is set to be press-fitted into this according to the outer diameter dimension of 0.

Therefore, the reel receiver 23 and the reel hub shaft 27 can be easily joined.

Note that, on the outer periphery of the reel hub shaft 27, three retaining protrusions 32 that engage with the reel hub of the tape reel are formed at equal angular intervals, similar to the conventional one.

Although the structure of the tape reel support device of the present invention has been described above based on the illustrated embodiments, the present invention can be implemented with various modifications.

For example, the fitting portions of the reel receiver 23 and the reel hub shaft 27 may be made polygonal to prevent slippage in the rotational direction, or both 23. 27 may be fixed by adhesive, screwing, or other means.

Further, by providing the spring piece 31, a special effect can be obtained as described above, but the present invention is not particularly limited to this.

As described in detail above, according to the present invention, an annular groove is formed in the joint portion of the reel receiver and the reel hub shaft, and this portion can function as a pulley, and as a result, the reel receiver and the reel hub shaft It is possible to provide a tape reel support device for a tape recorder, which can be manufactured by cutting out a tape in the axial direction, and which can reduce the height of the tape recorder, thereby making it possible to downsize the tape recorder.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the general structure of a cassette tape recorder, and FIG. 2 is a longitudinal sectional view of a tape reel support device showing an embodiment of the present invention. 1, 21... Fixed board, 22... Support shaft, 23... Reel holder, 24, 25...
...Protrusion, 26...Annular groove, 27...
・Reel hub shaft.

Claims (1)

[Scope of utility model registration request] A support shaft installed on the fixed base of the tape recorder, a disc-shaped reel receiver rotatably supported by the support shaft, a truncated conical protrusion formed on the top surface of the reel receiver, and a base. The reel receiver has a truncated conical protrusion on its end surface and is fixed to the upper surface of the reel receiver, forming an annular groove having a V-shaped cross section between the conical surface of the protrusion and the conical surface of the protrusion of the reel receiver. A tape reel support device for a tape recorder equipped with a reel hub shaft.