JPH05997Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) This invention relates to a cassette guide mechanism used in a digital audio tape player (hereinafter referred to as DAT).

(Prior technology) A DAT is an audio device that plays tape by wrapping a tape around a rotating head and outputting audio using digital signals. It has the advantage of providing good sound quality.

In such a DAT, the one shown in FIG. 2A is generally known as a cassette guide mechanism for positioning and holding the inserted cassette.

In FIG. 2A, the cassette holders 2a and 2b holding the cassette 1 are biased downward by a spring, and this biasing force presses the cassette 1 onto the chassis surface and disposes it on the chassis surface. Positioning is performed by a pair of positioning main guides 3a, 3b for height regulation and a pair of positioning sub-guides 4a, 4b for height regulation. Here, engagement protrusions 5a, 5b are provided at the tips of the positioning main guides 3a, 3b.
However, the engagement hole 1a provided on the lower surface of the cassette 1,
Positioning is performed by engaging inside 1b.

(Problems to be solved by the invention) By the way, in the cassette guide mechanism having such a configuration, when the pressing forces Fa and Fb by the cassette holders 2a and 2b are applied to both ends of the surface of the cassette 1, this pressing force is Via the cassette 1, it acts as a pressing force on the positioning main guides 3a, 3b and the positioning sub guides 4a, 4b, and as a reaction, the back surface of the cassette 1 pushes the positioning main guides 3a, 3b and the positioning sub guides 4.
It is pressed by points a and 4b. That is, the front side of the cassette 1 is pressed by the cassette holders 2a and 2b, while the back side is pressed by the positioning main guide 3.
a, 3b and positioning sub-guides 4a, 4b. In this case, as shown in Figure 2B,
The pressed surfaces 6a, 6b on the front surface of the cassette 1 are the longitudinal ends of the cassette 1, while the positioning guides 3a, 3b, 4a, 4 on the back surface of the cassette 1
Since the surfaces 7a, 7b, 8a, and 8b to be pressed by b are located on the center side in the longitudinal direction of the cassette 1, the surfaces to be pressed on the front and back sides (on the back side, they are arranged on the end side in the longitudinal direction of the cassette) Pressed surfaces 7a, 7 by the positioning main guides 3a, 3b
A bending moment is generated by the distances La and Lb between the center points in the longitudinal direction of the cassette and the pressing forces Fa and Fb by the cassette holders 2a and 2b.
In response to this moment, DAT cassette 1 is
It is thinner than conventional analog type cassettes, and the resin that makes up the DAT is extremely thin, so if the inside of the DAT gets hot, the resin material that makes up cassette 1 will soften, causing a creep phenomenon. Third
As shown in the figure, the cassette 1 may be greatly deformed and the reel may become unable to rotate.

The present invention was proposed to solve the problems of the prior art as described above, and its purpose is to hold and fix the inserted cassette in a fixed position on the chassis surface, while also making it possible to hold and fix the inserted cassette in a fixed position on the chassis surface. To provide a cassette guide mechanism which prevents deformation of a cassette by not generating a bending moment even with the pressing force of a cassette holding means.

[Structure of the invention] (Means for solving the problems) The cassette guide mechanism according to the invention has a cassette holding means equipped with a cassette pressing surface that presses both ends of the cassette surface, and a cassette pressing surface of the cassette holding means. The structure is characterized in that a cassette support means is provided at a position on the chassis surface opposite to the surface in the pressing direction, the cassette support means having a cassette support surface for supporting the back surface of the cassette.

(Function) According to the present invention having the above-described configuration, the pressing force of the cassette holding means applied to both ends of the cassette front surface and the pressing force of the cassette supporting means applied to both ends of the back surface of the cassette are equal to each other in the longitudinal direction of the cassette. Since the center points in the directions overlap, no bending moments are created in the cassette. Therefore, deformation of the cassette can be prevented.

(Embodiment) An embodiment of the present invention as described above will be specifically described with reference to the drawings. In addition, Fig. 2 A,
Components that are the same as those in the prior art shown in FIG.

*Configuration of Example* As shown in FIG. 1A, in this example,
A cassette support for supporting the back surface of the cassette 1 is located at a position opposite to the cassette pressing surfaces of the cassette holders (cassette holding means) 2a and 2b that press both ends of the surface of the cassette 1 on the chassis surface in the pressing direction. Deformation prevention guides (cassette support means) 9a and 9b having surfaces are provided.
Here, the deformation prevention guides 9a, 9b have a cylindrical shape with a diameter that is the same as the width of the cassette pressing surfaces by the cassette holders 2a, 2b, that is, the band-shaped pressed surfaces 6a, 6b of the cassette 1. In the direction orthogonal to the cassette 1, the cassette support surface, which is a circular plane, is pressed by the pressed surfaces 6a,
It is provided so as to be located at the center position of 6b. Note that the heights of the deformation prevention guides 9a, 9b are set equal to or slightly lower than the heights of the positioning guides 3a, 3b, 4a, 4b.

*Effect of the embodiment* In this embodiment having the above configuration,
Pressed surface 6 formed in a band shape at the end of cassette 1
When the pressing force of cassette holders 2a, 2b is applied to a, 6b, as shown in FIG. As a reaction to this pressing force, the cassette supporting surfaces of the deformation prevention guides 7a and 7b move against the back surface of the cassette 1 (the pressed surface 10).
The center point of the force in the longitudinal direction of the cassette overlaps with the pressing force applied to a and 10b). Therefore, unlike the prior art in which a bending moment is generated due to the deviation La and Lb between the center points of the pressing forces on the front and back sides of the cassette 1, the pressing forces of the cassette holders 2a and 2b simply bend the ends of the cassette 1 on both sides. Since the pressing force is applied to clamp the cassette 1 from the cassette 1 and no bending moment is generated, deformation of the cassette 1 can be prevented.

In addition, in this embodiment, the deformation prevention guide 7
The heights of a, 7b are the same as those of the positioning guides 3a, 3b,
Since the height is equal to or slightly lower than that of 4a and 4b, there is also the advantage that the cassette 1 can be positioned reliably.

*Other Embodiments* The present invention is not limited to the above-mentioned embodiments; for example, the shape of the cassette support means can be changed as appropriate, and a configuration in which not only one pair but a plurality of cassette support means are provided is also conceivable. . Further, the cassette supporting means may be constructed by using an appropriate dedicated member, or may be formed by standing up a chassis.

[Effects of the Invention] As explained above, in the present invention, in a cassette guide mechanism having a cassette holding means equipped with a cassette pressing surface that presses both ends of the cassette surface, the cassette pressing surface of the cassette holding means is By simply improving the structure by providing a cassette support means with a cassette support surface, it is possible to prevent the generation of bending moment, which has been a problem in the past, resulting in a high-performance cassette guide that can reliably prevent cassette deformation. mechanism can be provided.

[Brief explanation of the drawing]

FIG. 1A is a sectional view showing a cassette insertion state of a cassette guide mechanism according to an embodiment of the present invention;
Figure B is a plan view showing the pressed surface of the cassette in Figure 1A, Figure 2A is a sectional view showing the cassette inserted state of the conventional cassette guide mechanism, and Figure 2B is Figure 2A.
FIG. 3 is a plan view showing the pressed surface of the cassette, and FIG. 3 is a front view showing the cassette in a deformed state. 1...cassette, 1a, 1b...engaging hole, 2
a, 2b...Cassette holder (cassette holding means), 3a, 3b...Positioning main guide, 4
a, 4b...Positioning sub guide, 5a, 5b...
...Engaging protrusions, 6a, 6b, 7a, 7b, 8a, 8
b, 10a, 10b...Pressed surface, 9a, 9b...
...Deformation prevention guide (cassette support means).

Claims (1)

[Claims for Utility Model Registration] (1) A plurality of positioning guide means provided on the chassis surface so as to come into contact with the back surface of the cassette, and a cassette pressing surface for pressing both ends of the cassette surface, the cassette and a cassette holding means for holding the cassette by pressing it against the surface of the chassis, and for positioning the horizontal coordinates and height of the cassette, the cassette guide mechanism has the following: A cassette guide mechanism characterized in that cassette support means having a cassette support surface for supporting the back surface of the cassette is provided at an opposing position on the overlying chassis surface. (2) The cassette guide mechanism according to claim 1, wherein the cassette supporting means has a height of the cassette supporting surface relative to the chassis surface that is equal to or slightly lower than that of the positioning guide means. (3) Utility model registration claim 1, in which the cassette supporting means has a cylindrical shape with a diameter that is approximately the same as the width of the cassette pressing surface of the cassette holding means.
The cassette guide mechanism described in section.