JPS6331237Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a support device for a cassette holder of a tape recorder or the like.

As a supporting device of this type, one in which a cassette holder 1 rotates around a fulcrum 2 has been proposed, as shown in FIG. This is because the cassette holder 1 moves circularly around the fulcrum 2, so the movement is reliable.
Since it is necessary to dodge, it is necessary to place the fulcrum 2 far away, which has the disadvantage of increasing the size of the supporting device.

The present invention was made to improve this drawback, and by pivoting the first and second links to the cassette holder and the upright plate that supports it, rotational movement is smooth and almost parallel in the closed state. A fulcrum can be provided nearby for movement, which makes it easy to downsize.

Hereinafter, one embodiment of the present invention will be described based on the drawings. FIG. 2 shows a side view of the support device according to the present invention in an open state, and FIG. 3 shows a side view of the support device in a closed state. In the figure, 6 is a base plate of the tape recorder, 7 is a drive mechanism section of the tape recorder, and the drive mechanism section 7 is provided with a reel shaft 4 and a capstan 5 as in the conventional case, but in the present invention. Base plate 6
An upright plate 8 is installed on both sides of the cassette holder 1, and the upright plate 8 and the cassette holder 1 are connected to the first link 9 and the second link.
They are connected by a link 10.

That is, the first link 9 is connected to the upright plate 8 at the proximal fulcrum a.
The second link 10 is rotatably supported on the upright plate 8 at a proximal support point c.
Further, the distal support points b and d of the first link 9 and the second link 10 are respectively rotatably supported by the cassette holder 1, and these cassette holder 1, the first link 9, and the second link 10 , forming a four-joint restraint link with the upright plate 8 as a fixed side.

A helical spring 11 is wound around the proximal fulcrum a of the first link 9, and when a lock lever 13 to which a spring 12 is stretched is pushed down, the cassette holder 1 is tilted forward and opened. .

The proximal supporting points to the distal supporting points of the first and second links 9 and 10 are constructed as follows.

That is, in FIG. 4, the proximal fulcrum of the first link 9 is O and the distal fulcrum is A, and the proximal fulcrum of the second link 10 is Q and the distal fulcrum is B, as shown in the figure. If points O and Q are set, the tip side fulcrum A is
It performs a circular motion with OA as its radius, and the tip side fulcrum B performs a circular motion with OB as its radius.

Here, AB, that is, the first and second links 9, 10
The length between the tip side fulcrums b and c is set to be longer than A ₀ B ₀ that connects the intersection of circle A and circle B on straight line P connecting points O and Q.

As a result, if the angle between AB and the tangent at point A is β, then when A is rotated by α degrees as shown in the figure, the angle θ of AB with respect to the x-axis is sequentially θ ₁ = β ₁ + α θ ₂ = β ₂ θ ₃ = β ₃ −α θ ₄ = β ₄ −2α θ ₅ = β ₅ −3α. Here, as is clear from the figure,
Since β ₃ >β ₂ >β ₁ and β ₃ >β ₄ >β ₅ , the changes in θ ₄ and θ ₅ are larger than the changes in θ ₁ to _{θ 3} .

Therefore, by selecting the position where the change in θ is small as described above near the closed state and the position where the change in θ is large near the open state, the opening angle is large when the cassette holder 1 is near the open state, and it is near the closed state. Then, the movement is close to parallel movement.

The cassette holder 1 shown by the two-dot chain line in FIG.
In front of the reel shaft 4 and capstan 5,
It can be seen that it is in a substantially upright state, and that it moves substantially in parallel when transitioning to the closed state shown in FIG.

As explained above, in the present invention, the first link and the second link are automatically rotatably supported between the cassette holder and the upright plate that supports the cassette holder, and the base end side fulcrum of the first link and the distal side support point are fixed. By appropriately selecting and arranging the fulcrum with respect to the second link, smooth rotation due to circular motion can be obtained.Moreover, since it moves almost parallel in the closed state, the fulcrum can be placed in the drive mechanism of the tape recorder. It can be installed near the reel, making it easier to make it more compact, and it also has the effect of preventing unbalanced loads from being applied to the reel shaft and capstan during opening and closing operations, thereby preventing deformation, etc.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 is a side view of an embodiment of the device of the present invention in an open state, Fig. 3 is a side view of the device in its closed state, and Fig. 4 shows the principle of operation of the present invention. FIG. 1...Cassette holder, 8...Rise plate, 9...
First link, 10...Second link, a, c...Proximal side fulcrum, b, d...Distal side fulcrum.

Claims (1)

[Scope of utility model registration request] An upright plate 8 attached to the base plate 6 of the tape recorder, a first link 9 whose proximal end is pivoted a below the upright plate 8, and a first link c whose proximal end is pivoted above the upright plate 8. The distal end side of the second link 10 and the first link 9 is pivotally supported on the lower side, and the second link 10 is
The cassette holder 1 includes a link 10 whose distal end side is pivoted upward, and a spring member disposed between the first link 9 and the base plate 6 to rotate the first link 9 in the closing direction. , the first and second links 9 and 10 and the cassette holder 1 form a four-joint restraining link with the upright plate 8 as a fixed side, and the length between the pivot points b and d is It is characterized by being formed to be longer than the length between the intersection with a circle drawn centering on the axis support point a and the intersection with a circle drawn around the axis support point c on the line connecting the axis support points a and c. Support device for cassette holder.