JPS6325579Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a reel holding spring in a video cassette.The purpose of this invention is to have the function of holding two reels at the same time with one spring, and to have load stability and durability. It is an object of the present invention to provide a reel presser spring for a video cassette which has sufficient quality in terms of reliability such as fatigue resistance and is advantageous in terms of material cost.

As shown in Fig. 1, the conventional reel presser spring for this type of video cassette is designed to avoid contact between the rotating reels a, a' and the welded part c of the reel presser spring b, and to maintain the stability of this spring. In order to achieve this, the fixing part d is wide, the reel presser spring b has a rhombic outer shape, and hollow holes e and e' for adjusting the reel presser force are cut out.

With this shape, the distance between welded parts c and c' can be secured, so stability is good, and by adjusting the hollow, it is possible to set the spring constant without changing the stability of the spring. It is easy to deal with issues such as load setting and fatigue resistance.

However, this shape has the drawback of high material loss and high cost. That is, as shown in Fig. 2, this type of part is manufactured by slitting and punching a band-shaped material f to the required width, but the reel presser spring b is the most stable and reliable in cutting the material. This is a case where the longitudinal direction of the shape is taken as shown in the figure with respect to the direction of the grain of the spring material.

However, this causes too much loss, so there is also a method of continuously punching diagonally as shown in Figure 3, but in this case, the direction of the grain of the material with respect to the punching shape becomes imbalanced, causing the reel presser spring b to twist. It has the disadvantage of easily generating internal stress in the direction, which is advantageous in material removal, but is unfavorable in terms of the basic performance of the spring.

Furthermore, in order to reduce the amount of material, a linear reel presser spring g as shown in Fig. 4 a and b has been considered, but such a spring has poor stability and the fixing part h and reel presser part i are not stable. The distance becomes shorter, which is unfavorable in terms of reliability such as load stability and fatigue resistance.

For this reason, as shown in Fig. 5, the cross-shaped shape,
That is, although some improvement is achieved by providing the protrusions j above and below the fixing part h, the advantage is diminished in terms of material removal.

Next, a dogleg-shaped reel presser spring k as shown in FIG. 6 can be considered, but this alone still has the drawback of insufficient stability.

This invention was designed to eliminate the above-mentioned drawbacks, and as shown in Figure 7a and b, the main body of the spring plate is doglegged, and a fixed part in the center is added to increase stability. A protruding portion 3 is attached near 2.

The shaded part in Figure 7a is the part that comes in close contact with the fixed surface,
The reel presser 4 rises from the dotted line portion X and has a spring function as shown in FIG. 7b.
Spring plate body 1 with bent dogleg shape indicated by dotted line X
By making the spring plate main body 1 perpendicular to the direction of the arm, it is prevented from twisting when the spring plate main body 1 is pressed.

Also, regarding how to raise the spring plate body 1, it is better to raise it with a curvature as shown in Figure 8b, rather than in a straight line as shown in Figure 8a, so that the spring can be raised deeply as shown by the arrow. It is preferable that there is little lifting when pushed.

Furthermore, in the case of this spring shape, when taking the material, it is better to take the longitudinal direction of the dogleg-shaped spring body 1 in the flow direction (grain direction) of the material 5, as shown in FIG. 9, for better quality as a spring.・High reliability. In this case, if the protrusions 3 are projected in an appropriate amount, there will be no loss of material at all.

Further, the longitudinal direction of the spring body 1 is
Even when the material 5 is oriented perpendicularly to the flow direction of the material 5 as shown in FIG.

This idea is constructed as described above, but first, by creating a dogleg-shaped spring body as its basic shape, the distance from the fulcrum (fixed part) to the operating point (reel presser part) is increased. It is possible,
This makes it possible to improve manufacturing reliability such as load stability and fatigue resistance, and this shape inevitably expands the area of the fixed part, and the protrusion in the center prevents it from falling over. The overall balance can be stabilized, and the distance between the welded parts can naturally be made longer.Therefore, compared to the diamond-shaped reel presser springs that are commonly used, the material used is reduced and it is advantageous in terms of cost. In addition, even when compared to a straight-shaped spring that prioritizes material reduction, there is almost no difference in terms of material considering the space for the pilot hole for moving the material.
It can be said that the difference in quality is greater.

In addition, if the spring force or load point of the two reel holders are different and the direction is specified, it is difficult to distinguish between the diamond-shaped reel holder spring and the linear reel holder spring, and special measures are required. This invention has the advantage that the mounting direction is clear and workability is good.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the arrangement of a diamond-shaped reel presser spring and a reel of a conventional video cassette; FIGS. 2 and 3 are explanatory diagrams of a material removal means for the diamond-shaped reel presser spring;
Figures 4 to 6 are plan views of various shapes that can be considered as reel presser springs, Figures 7a and b are plan views and side views showing embodiments of the reel presser spring of this invention, and Figures 8a and b. 9 is an explanatory diagram for explaining the quality of the rising shape of the reel presser spring, and FIGS. 9 and 10 are explanatory diagrams showing examples of the material taking means of the reel presser spring of this invention. DESCRIPTION OF SYMBOLS 1... Dog-shaped reel presser spring plate main body, 2... Fixing part, 3... Protrusion part, 4... Reel presser part.

Claims (1)

[Scope of utility model registration request] The reel presser spring in a video cassette consists of a dogleg-shaped spring plate body with a fixing part at the center and reel pressers at both ends, and protrudes from inside the center of the dogleg shape and extends near the fixing part. A video cassette reel presser spring consisting of a protrusion.