JPH0227744B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to an improvement in the reel stand structure of a cassette recorder.

[Background of the invention]

Conventionally, in cassette type recorders, in order to avoid the problem of the cassette hub meshing with the clutch part of the reel stand when the cassette is installed, the clutch has a taper on one side so that the clutch piece can move up and down, and when pressed down, the clutch spring is reduced and the clutch hub rotates to absorb the engagement.

However, in the conventional structure, when the clutch is pushed down by engagement with the hub,
For example, referring to FIG. 3 of the embodiment of the present invention, if the clutch spring 9 comes into close contact between the lower end surface of the clutch piece 8 and the spring bearing surface 7b of the clutch spring 9 of the reel base 7, the clutch piece 8 cannot move downward. For this reason, there was a drawback in that the required clutch movement amount could not be obtained, especially when there was a limit to the upper and lower thicknesses.

In addition, so that the height of the clutch spring 9 when in close contact as described above does not affect the amount of clutch movement,
A structure in which the thickness of the clutch piece 8 is made thinner is also considered, but in this case, the wobbling of the clutch piece 8 with respect to the reel base 7 becomes large, which is not preferable from the standpoint of driving the cassette hub, and furthermore, the visible range of the clutch spring increases. has the disadvantage of being unfavorable in terms of appearance.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned situation, and an object of the present invention is to provide a reel stand structure for a cassette-type recorder that has a simple structure and can reduce the height of the reel stand.

[Summary of the invention]

The reel stand structure of the cassette type recorder of the present invention includes a reel stand rotatably supported at a predetermined position of a reel stand shaft, and a clutch spring interposed therebetween to engage with and rotate the hub of the cassette half. A clutch piece is attached to the reel stand so as to be displaceable in the axial direction of the reel stand, and a cap is rotatably attached to the reel stand shaft, which guides the attachment of the cassette half and prevents the clutch piece from coming off. and the clutch spring installed between the reel base spring receiving surface and the lower surface of the clutch piece, and the upper end side of the clutch spring is fitted into the lower surface of the clutch piece that comes into contact with the upper end of the clutch spring. A cutout is formed.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The reel stand structure of a cassette recorder according to the present invention will be explained below using an embodiment with reference to FIGS. 1 to 3. Fig. 1 is a perspective view of the parts of the cassette half and reel stand arranged in the order in which they are connected, Fig. 2 is a detailed view of section A in Fig. 1 with the cap removed, and Fig. 3 is a partially sectional front view. It is. In the figure, 1 is a cassette half, and a hub 3 inside the cassette half 1 has a tape 2 wound around its outer periphery. Convex portions 3a and concave portions 3b of hub claws are alternately formed on the inner circumference of the hub 3. Convex portion 3a and concave portion 3 of clutch hub 3
b is formed to be able to fit into the clutch protrusion 8a of the clutch piece 8.

Reference numeral 4 denotes a shaft, and a reel base shaft 6 is installed on the reel base shaft 6 with a reel base shaft bush 5 interposed therebetween, and a reel base 7 is rotatably fitted into and supported by the reel base shaft 6 in contact with the upper surface of the reel base shaft bush 5. has been done. Further, a coiled clutch spring 9 is disposed on a spring receiving surface 7b on the upper surface of the reel stand 7 on the outer periphery of a hexagonal column 7a protruding upward from the center side of the reel stand 7. The upper end of the clutch spring 9 is attached to a clutch piece 8 which is loosely fitted into the hexagonal column 7a and is movable in the axial direction of the hexagonal column 7a.
A clutch recessed part 8b is formed in this abutting part, into which the upper end of the coiled clutch spring 9 is fitted. , 3b is formed. 10 is a hexagonal column 7a
A cap that is press-fitted to the upper end and has the function of preventing the clutch piece 8 from coming off, and also has the function of preventing the clutch piece 8 from coming off.
The upper part is formed into a conical shape so as to guide the reel when it is inserted, and is rotatably locked to the upper end of the reel stand shaft 6 via a retaining washer 11.

Further, in the lower part of the reel stand 7, a spring receiver 15 is press-fitted onto the outer periphery of the portion of the reel stand 7 where the reel stand shaft 6 is fitted. A friction plate 13 whose rotation is locked by the chassis 4 is loosely fitted onto the outer periphery of the press-fitted portion of the spring receiver 15 . A friction felt 12 is disposed between the upper surface of the friction plate 13 and the lower surface of the reel stand 7.
A friction spring 14 is disposed between the spring support 15 and the spring support 15, and serves as a mechanism to provide back tension during review. Therefore,
Felt 12 on the lower surface of reel stand 7, friction plate 13,
The space in the vertical direction of this part where the spring 14 and spring receiver 15 are attached is an indispensable part.

With the structure described above, when the hub 3 of the cassette half 1 is placed on the cap 10, the end surface of the cap 10 is formed into a tapered shape, so that the hub 3 is placed on the cap 10.
is smoothly guided, and the convex portion 3a and concave portion 3b are brought into contact with the clutch convex portion 8a, and as they are pressed and moved, they are rotationally driven, and the concave and convex portions 3b, 3a of the hub 3 and the clutch convex portion 8a engage. will be carried out reliably. In this case, the height at which the clutch piece 8 is displaced is determined by the displacement for fitting the clutch piece 8 because the upper end of the clutch spring 9 is located inside the lower surface of the clutch piece 8 by the depth of the clutch recessed part 8b. You can keep your distance. That is, the height (thickness) of the reel stand structure can be made thinner compared to the conventional state in which the movable distance of the clutch piece 8 is the same. The tape 2 can be driven by the reel stand 7 being driven by a motor (not shown).

In this way, the reel stand structure of the cassette type recorder of this embodiment has a structure in which the clutch retracted part is formed from the lower surface of the clutch piece and the upper end of the clutch spring is fitted into it, so that the structure is simple and the clutch retracted part is formed. Since the height of the reel stand can be reduced by the depth, the mechanism can be made thinner. Furthermore, since the thickness of the clutch piece in the axial direction does not change, wobbling relative to the reel base does not increase. Furthermore, the visible range of the clutch spring does not increase.

〔Effect of the invention〕

As described above, the reel stand structure of the cassette type recorder of the present invention has the effect of allowing the height of the reel stand to be lowered with a simple structure and the mechanism of the VTR to be made thinner.

[Brief explanation of drawings]

Fig. 1 is a perspective view of the cassette half and reel stand of an embodiment of the reel stand structure of a cassette recorder according to the present invention, in which parts are arranged in the order in which they are connected, and Fig. 2 is a detailed view of part A in Fig. 1, excluding the cap. Figure 3 is the first
A front view showing a partial cross-section of the parts shown in the figure,
FIG. 4 is a front view of the same portion as in FIG. 3, with the clutch piece pressed downward from the state shown in FIG. 1... Cassette half, 3... Hub, 6... Reel stand shaft, 7... Reel stand, 7b... Spring receiving surface, 8... Clutch piece, 8b... Clutch retracted part, 9... Clutch spring , 10...cap.

Claims (1)

[Claims] 1. The reel stand rotatably supported at a predetermined position on the reel stand shaft, and the reel stand movable in the axial direction with a clutch spring interposed in order to engage with the hub of the cassette half and rotate the hub. A clutch piece attached to the reel stand, a cap rotatably attached to the reel stand shaft that guides the mounting of the cassette half and prevents the clutch piece from coming off, a reel stand spring bearing surface, and the clutch. The clutch spring is installed between the lower surfaces of the clutch, and the upper end of the clutch spring comes into contact with the lower surface of the clutch,
A reel stand structure for a cassette type recorder, characterized in that a clutch retracted portion is formed into which the upper end side of the clutch spring is inserted.