JPH0124772Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cassette tape recorder having a capstan shaft.

Conventionally, there have been devices of this type as shown in FIGS. 1 and 2.

In FIG. 1, 1 is a cassette half, 2 is a hole provided in the cassette half 1 for penetrating the capstan shaft, and 3 is a capstan shaft installed concentrically with the center of the through hole 2. In FIG.

FIG. 2 is a cutaway plan view of the main parts of FIG. 1, in which 4 is a tape, 5 is a guide fixed to the cassette half 1, and 6 is a pivotally supported roller.

In the conventional cassette tape recorder constructed in this way, the tape 4 in the cassette half 1 is
is guided by a guide 5 and rollers 6 and passes through a position close to the capstan shaft 3 (below the capstan shaft 3 in FIG. 2).

However, the distance between the capstan shaft 3 and the tape 4 is extremely short (for example,
0.25mm), so when tape 4 runs, guide 5
The tape 4 is charged due to friction with the roller 6,
If the capstan shaft 3 is rotating when the tape 4 is stopped, there is a problem in that the tape 4 sticks to the capstan shaft 3 due to electrostatic attraction and gets wound up.

SUMMARY OF THE INVENTION An object of the present invention is to provide an improved cassette tape recorder that overcomes the problems of the conventional capstan shaft device described above and can prevent the tape from being caught in the tape.

Embodiments of the present invention will be described below with reference to the drawings.

Figure 3 corresponds to Figure 2, where 1 is the cassette half, 2 is the through hole provided in the cassette half 1, 3' is the capstan shaft, and 4 is the tape 5 fixed to the cassette half 1. guide, and 6 is a pivoted roller.

What is important here is that the capstan shaft 3' in the present invention is eccentrically provided in the direction away from the tape 4 from the center C of the through hole 2.

With this eccentric configuration, even if the capstan shaft 3' rotates while the charged tape 4 is stopped, the distance between the capstan shaft 3' and the tape 4 is greater than before. , winding of the tape 4 due to electrostatic attraction force can be prevented.

To give a specific numerical example, when using a capstan shaft with a diameter of 2.5 mm (the diameter of through hole 2 is 4.5 mm according to the standard), when installed in the conventional concentric position, the distance (clearance) from the tape is 0.25mm
However, when the tape is eccentrically installed at a position 0.3 mm above the center C of the through hole as in the present invention, the distance from the tape is 0.55 mm. The attractive force due to static electricity is inversely proportional to the square of the distance, so it is about 1/5 of the conventional force, making it highly effective. No tape wrapping occurred.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the capstan shaft position of a conventional cassette tape recorder, Fig. 2 is a cutaway plan view of the main part of Fig. 1, and Fig. 3 is a capstan of a cassette tape recorder according to an embodiment of the present invention. FIG. 3 is a fragmentary plan view of a main part showing the shaft position. 1...Cassette half, 2...Through hole, 3,
3'...capstan shaft, 4...tape.

Claims (1)

[Scope of utility model registration request] A cassette tape recorder in which the tape is driven by a capstan shaft, characterized in that the mounting position of the capstan shaft is eccentric in the direction away from the tape from the center of the through hole of the cassette half.