JPH0525099Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a spring for supporting the reel of a videotape cassette. This invention relates to a spring for supporting a reel of a videotape cassette, which allows the reel to rotate smoothly.

[Conventional technology]

Traditionally, videotape cassettes are shown in Figures 3 and 4.
As shown in the figure, a supply reel 3 and a take-up reel 4 are housed and installed in upper and lower cases 1 and 2, and these reels 3 and 4 are guided by reel guides 5 and 6 formed in the lower case 2. It was starting to rotate. Further, a central portion of a reel supporting spring 9 is fitted into a predetermined portion of the bottom surface of the upper case 1, and a central portion of the upper surface of each of the reels 3, 4 is fitted by predetermined portions of both side ends of the reel supporting spring 9. The supply reel 3 and the take-up reel are rotated by the rotation of the supply reel stand and the take-up reel stand engaged with the lower sides of the respective reels 3 and 4 by pressing the respective reel rotating shafts 7 and 8 protruding from the reel 3 and 4. 4 was starting to rotate.

[Problem to be solved by the invention] The reel supporting spring 9 of such a videotape cassette is
The ends of both sides of the reels 3 and 4 simply push the rotating shafts 7 and 8 downward, so when the tape wound on both reels 3 and 4 runs, both reels The rotational centers of the reels 3 and 4 were inconveniently moved back and forth and left and right by the amount of play between the reels 3 and 4 and the reel guides 5 and 6. For this reason, undesirable frictional resistance occurs between each reel 3, 4 and each reel guide 5, 6, and the tape does not run smoothly, resulting in poor image quality during recording and playback. Furthermore, if the play between the supply reel 3 and the supply reel guide 5 and the play between the take-up reel 4 and the take-up reel guide 6 are not constant, tape running problems will be severe and recording・There was a drawback that the image quality during playback was even worse.

Further, since the conventional reel supporting spring 9 has a diamond shape with the central portion cut out, it requires a large amount of raw materials for manufacturing and has the disadvantage of increasing the manufacturing cost due to the large amount of loss due to the cutting. .

[Means to solve the problem]

The above-mentioned drawback is that a tension supporting embossed portion is formed at a predetermined center portion of the thin curved metal strip body, and fixing portions are formed at predetermined portions on both side edges adjacent to the tension supporting embossed portion. Holes are drilled respectively, and the fixing holes are fitted into respective fixing protrusions protruding from the bottom surface of the upper case of the videotape cassette, and tension maintaining floats are provided at predetermined locations on both side edges adjacent to the fixing holes. According to the present invention, projecting portions are respectively formed, and reel rotating shaft supporting recesses are formed upward from the lower surface of the metal strip body at predetermined portions on both side ends of the metal strip body. This problem is solved by the reel supporting spring of the videotape cassette.

[Examples and effects]

Hereinafter, embodiments of the present invention and their effects will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a spring for supporting the reel of a videotape cassette according to the present invention. As shown in the drawing, the spring is a thin plate-like curved metal having a predetermined width and both side ends curved downward. An H-shaped tension support embossed portion 12 is formed in a predetermined central portion of the strip body 11 by being depressed downward from the upper surface, and predetermined portions adjacent to the tension support embossment toward both side ends are formed. A fixing hole 13 for fitting a reel supporting spring is formed in the bottom surface of the upper case 21 of the videotape cassette, and an elliptical hole is formed in a predetermined portion toward both side ends adjacent to the fixing hole 13. Tension maintaining embossed portions 14 are formed upwardly from the lower surface, and reel rotating shaft supporting recesses 15 are formed upwardly from the lower surface at predetermined positions on both side ends of the metal strip body 11. are formed respectively.

Further, the metal strip body 11 is made of a thin metal plate spring material having a predetermined inclination from the center portion and curved downward at both side ends. The shapes of the tension supporting embossed part 12 and the tension maintaining embossed part 14 are not limited to the H-shape and ellipse, but are designed to support the tension of the reel supporting spring. It can be changed and formed into any form as long as it can be maintained.
Further, the shape of the reel rotation shaft supporting recess 15 may be formed into a hemispherical or conical shape as long as it can pivotally support the reel rotation shafts 25 and 26, respectively.

The reel supporting spring of the videotape cassette according to the present invention formed in this manner has the center portion of the metal strip body 11 brought into close contact with the bottom surface portion of the upper case 21 of the videotape cassette, as shown in FIG. The fixing protrusions 29 protruding from the upper case 21 are connected to the fixing holes 13 of the metal strip body 11.
The reel rotating shaft supporting recesses 15 formed at both end portions of the metal strip body 11 are fitted to the rotating shaft 25 of the supply reel 23 and the rotating shaft 26 of the take-up reel 24, respectively. Install by inserting and pivoting. Unexplained code 2 in Figure 2
Reel guides 7 and 28 are formed in the lower case 22 and guide the supply reel 23 and the take-up reel 24, respectively.

The reel supporting spring of the videotape cassette according to the present invention installed in this way is designed to prevent the videotape from rotating when the reel 23, 24 is engaged with the supply reel stand and the take-up reel stand, respectively. , reel rotation shaft 25 of reels 23 and 24,
26 is inserted and pivoted into each reel rotation shaft support recess 15 of the metal strip body 11 and rotated, so the rotation centers of each reel rotation shaft 25 and 26 are free to move as in the conventional case. The center of rotation is rotated constantly while maintaining a fixed position. Therefore, the videotape runs smoothly without the occurrence of the inconvenient frictional resistance between the reels 23, 24 and the reel guides 27, 28, as in the conventional case, and the image quality is improved during recording and playback. It becomes extremely good.

[Effect of idea]

As explained above, the reel supporting spring of the videotape cassette according to the present invention has reel rotating shaft supporting recesses formed at both end portions of the reel supporting spring, and the reel rotating shaft supporting recesses Since the reel rotation shaft is pivotally supported, the rotation shaft does not move around as in the conventional case and rotates at a fixed position, resulting in extremely good image quality during recording and playback.

In addition, since the reel supporting spring of the videotape cassette according to the present invention is formed in a band-shaped metal strip, fewer materials are required in manufacturing than in the past, and the loss rate during manufacturing processing is reduced. This has the effect of lowering manufacturing costs.

Furthermore, since the reel support spring according to the present invention is formed with a plurality of raised parts recessed in mutually opposite directions, the tension of the reel support spring can be appropriately adjusted and maintained.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a spring for supporting the reel of a videotape cassette according to the present invention, and Fig. 2 is a longitudinal section showing a state in which the spring for supporting the reel of the videotape cassette according to the invention is installed in the cassette. 3 is a vertical sectional view showing a conventional videotape cassette with a reel support spring installed inside the cassette, and FIG. FIG. DESCRIPTION OF SYMBOLS 11... Metal band plate body, 12... Embossed part for tension support, 13... Fixing hole, 14... Embossed part for tension maintenance, 15... Recessed part for supporting reel rotation shaft, 23... Supply reel, 24... Take-up reel, 25, 26... Reel rotation shaft, 27, 28...
...Reel guide, 29...Fixed protrusion.

Claims (1)

[Claims for Utility Model Registration] 1. A tension supporting embossed portion is formed at a predetermined central portion of a thin curved metal strip body, and the metal strip body adjacent to the tension supporting embossed portion is Fixing holes are drilled at predetermined portions toward both side ends, and the fixing holes are fitted into respective fixing protrusions protruding from predetermined portions on the bottom of the upper case of the videotape cassette, and the metal holes adjacent to the fixing holes are fitted into the fixing holes. Tension-maintaining embossed portions are formed at predetermined portions toward both side ends of the metal strip body, and recesses are formed upward from the lower surface of the metal strip body at predetermined portions at both side ends of the metal strip body. A spring for supporting a reel of a videotape cassette, characterized in that a concave portion for supporting a rotating shaft is formed respectively. 2. Claim 1, wherein the tension supporting embossed part is recessed downward from the upper surface of the metal strip body in an H-shape.
Spring for supporting the reel of the videotape cassette described. 3. Claim 1, wherein the tension maintaining raised part is formed by being depressed upward from the lower surface of the metal strip body in an elliptical shape.
Spring for supporting the reel of the videotape cassette described.