JPS61192086A - Reel pressing spring mounting structure at tape housing box - Google Patents

Abstract

PURPOSE:To assure a pressing energising at a tape reel revolving center by preventing the reel pressing spring from moving and by rendering an opening form of through hole non circular. CONSTITUTION:A tip part of its columnar projection 17 which is inducted from the through hole 16 is pressed by an ultrasonic welding machine, for example, to be extended considerably and a supporting part 13 of the reel pressing spring 12 is held between the pressed part 18 and an inside of upper half 2. And in this case,a part 18a of the pressed and pressed part 18 will come round to a space of interval between longitudinal both ends parts of the through hole 16 and the columnar projection 17 and fills this space. Thus the pressed part 18 which comes round to this through hole 16 prevents the pressing spring 12 from moving to circumference and radial directions of the columnar projection 17 and assures to fix this reel pressing spring 12 without looseness.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a tape storage box that rotatably accommodates a tape reel, and particularly relates to a reel presser that compresses and biases the center of rotation of the tape reel in the axial direction. The installation is related to the structure.

[Technical background of the invention]

For example, in a video tape cassette, in order to prevent the tape reel housed inside the cassette body from wobbling, a thin plate-like metal plate extending from the inner surface of the cassette body is placed at the center of rotation of the tape reel. The tape reel is pressed and biased from one side in the axial direction by bringing the tip of the reel presser spring into contact with the tape reel.

(Utility Model Application Publication No. 59-92483 or Utility Model Application No. 59-92483)
(Refer to Publication No. 95464) Therefore, in fixing the reel pressing spring,
A through hole is created at one end of the reel presser spring that overlaps the inner surface of the cassette body, a columnar protrusion extending from the cassette body is inserted into this through hole, and its tip is crushed using an ultrasonic welder or the like. One end of the reel pressing spring is inserted and fixed between the squashed portion and the inner surface of the cassette body.

[Problems with background technology]

However, in the past, the opening shape of the through hole and the cross-sectional shape of the columnar protrusion were both formed into a substantially perfect circle, so even if one end of the reel pressing spring was pressed between the crushed portion and the inner surface of the box, Even if it was clamped and removed, there was no restriction on the position in the circumferential direction.

Therefore, the reel pressing spring can easily rotate in the circumferential direction,
In particular, when the clearance between the through hole and the columnar protrusion is large, the reel presser spring moves not only in the circumferential direction of the hole but also in the radial direction, causing the entire spring to shake.

[Purpose of the invention]

The present invention was made based on these circumstances, and
The purpose of mounting a reel presser spring in a tape storage box is to obtain a structure that can prevent rattling of the reel presser spring and stably suppress the center of rotation of the tape reel.

, [Summary of the Invention] That is, in order to achieve the above object, the present invention is characterized in that among the columnar projection and the through hole, at least the opening shape of the through hole is non-circular.

[Embodiments of the invention]

The first embodiment of the present invention will be described below as a Teig cassette for video.
The explanation will be based on FIGS. 1 to 8 in which K is applied.

In the figure, reference numeral 1 indicates a cassette body made of ABS resin that constitutes a box body. Connected with screws, etc. A pair of tape reels 4, 4 are rotatably arranged in parallel within the cassette body 1. The tape reels 4, 4 are equipped with a cylindrical hub 6 around which the magnetic tape 5 is wound, and a disc-shaped flange 7.8 coaxially attached to both ends of the hub 60. The mounting hole 9 that one end of the professional has opened at the bottom -73,
It is presided over by 9.

The magnetic tape 5 fed out from one tape reel 4 is pulled out along a recess 1σ provided on the front surface of one side of the cassette body 1 into which a tape pull-out pin is inserted. It is wound onto the other tape reel 4.

Note that reference numeral 11 in the figure indicates an opening/closing lid that covers the front opening of the recess 10. When the cassette main body 1 is attached to the video deck side, this opening/closing lid 11 is rotated upward as shown in Figure #c8, and the magnetic tape is removed. 5 is exposed.

Incidentally, a reel presser spring 12 is attached to the inner surface of the upper half 2 to press and bias the rotational center portion 6a of the hub 6 in the axial direction from one side.

As shown in FIG. 4, this reel presser foot 12 is constructed by bending a thin metal plate with a thickness of approximately 0.10 to 0.2 nm. Kf, which can be elastically deformed from one end of the support part 13 toward the rotation center 61 of the tape reels 4, 40.
r! + bent spring plate portion 14. One end edge of the support portion 13 is in contact with a partition wall 15 that partitions the recess 10 and the internal space of the cassette body 1, and a through hole 16 is provided in the center of the support portion 13. . In this embodiment, the opening shape of the through hole 16 is similar to that of the reel presser. It is formed into a long hole shape along the longitudinal direction of 12, and a shape that is not a perfect circle. In this case, the dimension of the through hole 16 in the short axis direction is formed to be approximately equal to the diameter of the columnar projection 1r.

Further, the tip of the columnar protrusion 12 led out from the through hole 16 is crushed and expanded widely by, for example, an ultrasonic welding machine, and between this crushed portion 18 and the inner surface of the upper half 2. The support portion 13 of the reel pressing spring 12 is held between the two ends, and at this time, as shown in FIG. 6 and FIG. It is inserted into the space between the columnar protrusion 11 and closes this space.

In such a configuration, when installing the reel presser spring 12, as shown in FIGS. 4 and 5,
The support part 13 is superimposed on the inner surface of the upper half 2, and at this time,
When the columnar protrusion 17 is inserted into the through hole 16, the reel pressing spring 12 is temporarily fixed.

After the reel pressing spring 12 is temporarily fixed to the upper convex part 72 in this way, the leading end of the columnar projection 17 is crushed to form a crushed part 18, and this crushed part 1
8 and the inner surface of the upper half 2, the support part 13 is inserted and fixed.

According to the first embodiment of the present invention, the opening shape of the through hole 16 through which the columnar protrusion 17 passes through is formed into a long hole shape for the columnar protrusion 17 having a circular cross section. When the tip of the protrusion 17 is crushed, a portion l11m of the molten crushed portion 18 is pushed into the through hole 16 and solidified.

Therefore, the presence of the squashed portion 18 pushed into the through hole 16 prevents the reel presser spring 12 from moving in the circumferential and radial directions of the columnar protrusion 12, and the reel presser spring 12 is prevented from moving in the circumferential and radial directions of the columnar protrusion 12. 12 can be securely fixed without wobbling.

In the first embodiment described above, only the through hole 16 side was formed into a long hole shape, but for example, in the second embodiment of the present invention shown in FIG.
As in the embodiment, the cross-sectional shape of the columnar protrusion 17 may be formed into a flat shape that matches the opening shape of the elongated hole.

In addition, as in the third embodiment shown in FIG.
The opening shape of 6 and the cross-sectional shape of the columnar protrusion 17 are made into a matching rhombus shape or an oval shape as in the fourth embodiment shown in FIG. 11, and furthermore, in the fifth embodiment shown in FIG. It may also have a shape like this.

Further, the tape cassette according to the present invention is not limited to use for video, but may be used for audio or memory of a combiator, for example.

〔Effect of the invention〕

According to the present invention described in detail above, it is possible to prevent the reel pressing spring from moving in the circumferential direction and radial direction of the columnar projection, so that the reel pressing spring can be securely fixed to the inner surface of the box without rattling. This has the advantage that the center of rotation of the tape reel can be reliably suppressed and biased.

[Brief explanation of drawings]

1 to 8 show a first embodiment of the present invention.
The figure is a partially sectional side view of the tape cassette, Figure 2 is a plan view of the inside of the box, Figure 3 is a plan view showing how the reel presser spring is installed, and Figures 4 and 5 are the side view of the reel presser spring. Figure 6 is an enlarged cross-sectional view of part ■ in Figure 5, Figure 7 is a cross-sectional view taken along line Ml-■ in Figure 6, and Figure 8 is a cross-sectional view showing the installation procedure.
9 is a plan view showing a second embodiment of the present invention, FIG. 10 is a plan view showing a third embodiment of the present invention, and FIG. 11 is a plan view showing a fourth embodiment of the present invention. FIG. 12 is a plan view showing a fifth embodiment of the present invention. 1...Box body (cassette body), 4...Tape reel, 6a...Rotation center, 12...Reel presser,
15... Through hole, 17... Column-shaped protrusion, 18... Squashing part.

Claims (1)

[Scope of Claims] A tape storage box in which a thin plate-like reel pressing spring is provided on the inner surface of a box body rotatably housing a tape reel, and the tape reel is provided with a thin plate-like reel pressing spring that presses and biases the rotational center of the tape reel in the axial direction, This reel pressing spring has a through hole at one end overlapping with the inner surface of the box body, through which the columnar protrusion protruding from the inner surface of the box body passes, and the columnar protrusion is inserted into this through hole. In the mounting structure of the reel presser spring, in which one end of the reel presser spring is clamped and fixed between the crushed part and the inner surface of the box body by inserting the reel presser spring and crushing its tip, the above-mentioned columnar protrusion and a structure for mounting a reel presser spring in a tape storage box, characterized in that, among the through holes, at least the opening shape of the through hole is non-circular.