JPS61199286A - Fitting structure of reel holding spring in tape storing box - Google Patents

Abstract

PURPOSE:To prevent shaking and tilting by forming a locking piece that projects inside in radial direction and stretches to the tip of a columnar projection in the periphery of opening of a through hole. CONSTITUTION:When fitting a reel holding spring 12, a columnar projection 17 is inserted in a through hole 16 of a support 13, and the support 13 is superposed on the inner face of an upper half 2. In this case, as a sharp coupling piece 18 is present on the periphery of opening of the hole 16, the tip of the coupling piece 18 makes sliding contact to the outer peripheral face of the projection 17, and when the support 13 is superposed on the inner face of the upper half 2, the tip of the coupling piece 18 cuts into the outer peripheral face of the projection 17. Thus, resistance increases against external force in the direction of coming out. Shaking and tilting of the whole spring 12 is prevented, and the support 13 is kept in the state of close contact with inner face of the upper half 2. Then, the tip of inserted projection 17 is squashed by an ultrasonic welding machine to complete fitting.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a tape storage box rotatably housing a tape reel, and in particular to a reel pressing spring that presses and biases the center of rotation of the tape reel in the axial direction. Regarding the mounting 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, the tip of a metal reel pressing spring extending from the inner surface of the cassette body is installed at the center of rotation of the tape reel. The tape reel is pressed and biased in the axial direction from one side. (Refer to Japanese Utility Model Application Publication No. 59-92483 or No. 59-95464.) By the way, this type of reel pressing spring consists of a thin and flat support portion that is superimposed on the inner surface of the cassette body, and an end of this support portion. The tape reel is provided with an elastically deformable spring plate portion that is bent toward the center of rotation of the tape reel, and is bent in the shape of a disconnection circuit.

Conventionally, such a reel pressing spring has a through hole in the center of its support part, and a columnar protrusion extending from the cassette body is inserted into this through hole, and the insertion tip of the columnar protrusion is inserted into the through hole. It is fixed to the inner surface of the box by crushing the parts as necessary.

[Problems with background technology]

However, not only is the reel presser spring not flat as a whole, but the length of the support part is shorter than that of the spring plate part, so the center of gravity is biased towards the spring plate part. When inserting the protrusion, the entire spring sometimes rattled or tilted. Therefore, there is a problem that the columnar protrusion easily comes off from the through hole, which hinders the flow of subsequent assembly work.

[Object of the invention] The present invention was made based on the above circumstances, and
To provide a mounting structure for a reel presser spring in a tape storage box, which can prevent the reel presser spring from rattling and tilting, and allows the installation work to be carried out reliably and efficiently.

(Summary of the Invention) That is, in order to achieve the above-mentioned object, the present invention has a through-hole formed in a support portion of a reel presser spring, which has a hole in the opening periphery that overhangs inward in the radial direction and extends toward the tip side of the columnar projection. A locking piece is formed, and when the columnar protrusion is inserted into the through hole, the tip of the locking piece bites into the outer peripheral surface of the columnar protrusion.

[Embodiments of the invention]

An embodiment of the present invention will be described below based on the drawings in which the present invention is applied to a video tape cassette.

In the figure, 1 is a cassette body made of ABS resin that constitutes a box body, and this cassette body 1 has a two-part structure with an upper half 2 and a lower half 3, and these halves 2.3 are abutted against each other. Connected with screws, etc. A pair of tape reels 4.4 are rotatably arranged in parallel within the cassette body 1. The tape reel 4.4 includes a cylindrical hub 6 around which a magnetic tape 5 is wound, and disc-shaped flanges 1.8 coaxially attached to both ends of the hub 6. Mounting hole 9.9 opened in the lower half 3
is supported by.

The magnetic tape 5 unwound from one tape reel 4 is pulled out along a recess 10 into which a tape pull-out pin provided on the front surface of one side of the cassette body 1 is inserted, and the leading end of the magnetic tape 5 is pulled out from the other tape reel 4. It is wound on reel 4.

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 FIG. 5 is exposed.

Incidentally, a reel pressing 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. If you press this reel 1
2 has a thickness of 0.1 m to 0.2 m as shown in Figure 3.
It is constructed by bending a metal plate as thin as + in thickness, and includes a flat support portion 13 that is overlapped with the inner surface of the upper half 2, and a flat support portion 13 that extends from one end of this support portion 13 toward the rotation center portion 6a of the tape reels 4, 4. The spring plate portion 14 is bent to be elastically deformable. The support portion 13 is formed to have a shorter overall length than the spring plate portion 14, and therefore,
The entire spring has a broken circuit shape, and the center of gravity is biased toward the spring plate portion 14 side. 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 circular through hole 16 is formed in the center of the support portion 13 by punching, for example, by a press. ing. A cylindrical columnar protrusion 17 integrally protruding from the upper half 2 side is inserted into the through hole 16, and the support portion 13 is overlapped with the inner surface of the upper half 2 by this insertion. .

Furthermore, as shown in FIG. 7, a sharp locking piece 18 is integrally formed on the opening periphery of the through hole 16, projecting inward in the radial direction and extending toward the tip side of the columnar projection 17. has been done. The locking piece 18 of this embodiment is connected to the through hole 16.
When punching out with a press, the through hole 16 is punched out so that a burr remains at the opening periphery of the through hole 16, and the unnecessary burr that is normally removed in the punching pattern is skillfully used as the locking piece 18. The locking piece 18 is designed to bite into the outer peripheral surface of the columnar protrusion 17 when the columnar protrusion 17 is inserted into the through hole 16.

In the case of this embodiment, the insertion tip of the columnar protrusion 17 inserted into the through hole 16 is crushed and expanded by, for example, an ultrasonic melting machine, and the crushed part 19 and the upper half The support portion 13 is held between the inner surface of the support portion 2 and the inner surface of the support portion 2 .

In such a configuration, when attaching the reel presser spring 12, the columnar protrusion 11 is inserted into the through hole 16 of the support portion 13, and the support portion 13 is overlapped with the inner surface of the upper half 2. In this case, since a sharp locking piece 18 is present at the opening periphery of the through hole 16, the tip of the locking piece 18 comes into sliding contact with the outer circumferential surface of the columnar protrusion 17 due to the insertion, and the supporting portion 13 When stacked on the inner surface of the upper half 2, the tip of the locking piece 18 bites into the outer peripheral surface of the columnar projection 17. However, since the locking piece 18 faces toward the tip side of the columnar protrusion 11, the resistance increases especially against external force in the direction of removal.
Therefore, the entire reel pressing spring 12 is prevented from rattling or tilting, and the support portion 13 is kept in close contact with the inner surface of the upper half 2.

Once the reel pressing spring 12 has been positioned in this way, the insertion tip of the columnar protrusion 17 is crushed using an ultrasonic melting machine, and the support portion 13 is inserted between the crushed portion 19 and the inner surface of the upper half 2. Installation is completed by pinching.

Therefore, according to such an embodiment of the present invention, if the columnar projection 17 is inserted into the through hole 16 and the support portion 13 is superimposed on the inner surface of the upper half 2, the locking piece 18 will fit into the columnar projection. The reel presser spring 12 is bitten into the portion 11, and the reel presser spring 12 is prevented from rattling or tilting. Therefore, the support part 13 does not fall off from the columnar protrusion 17 or tilt before moving on to the next crushing operation, and the reel presser spring 12 can be reliably attached.

At the same time, there will be no hindrance to the work flow, which improves work efficiency and reduces the amount of time required to press the reel.
2 to the crushing of the columnar protrusions 17 can be arranged on a line as a series of steps, which is convenient for automating the work.

In addition, since the locking piece 18 extends toward the distal end side of the columnar projection 11, the locking piece 18 touches the outer periphery of the columnar projection 11 when inserting the columnar projection 17 into the through hole 16. There is also the advantage that there is no risk of it getting caught on the surface and it does not interfere with the insertion work.

In addition, in the above-mentioned embodiment, the support part is held between the crushed part of the tip of the columnar projection and the inner surface of the upper half, but in some cases, the reel pressing spring may be fixed only by the biting force of the locking piece. You can do it like this.

Further, the tape storage box according to the present invention is not specified for video use, but may be for audio use or computer memory use, for example.

〔Effect of the invention〕

According to the present invention described in detail above, when the columnar projection is inserted into the through hole, the locking piece bites into the outer peripheral surface of the columnar projection.
By pressing the reel, you can prevent the reel from rattling and tilting. Therefore, the support part does not fall off or tilt from the columnar protrusion before moving on to the next work, and the reel presser spring installation work can be done reliably and efficiently, which is useful for automating the work. There are advantages that come in handy.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partially sectional side view of the tape cassette, Fig. 2 is a plan view of the inside of the box, and Figs. 3 and 4 show the installation procedure of the reel presser spring. The cross-sectional view shown in FIG. 5 is a view taken from the direction of the V line in FIG.
FIG. 6 is an enlarged sectional view of the part 2 in FIG. 3, FIG. 7 is an enlarged sectional view of the through hole portion, and FIG. 8 is a perspective view of the tape cassette. 1...Cassette body), 4...Tape reel, 6a...Rotation center, 12...Reel presser,
DESCRIPTION OF SYMBOLS 13... Support part, 14... Spring plate part, 16... Through hole, 17... Column-shaped protrusion, 18... Locking piece.

Claims (1)

[Scope of Claims] A reel pressing spring made of a material harder than the box body is provided on the inner surface of the box body rotatably housing the tape reel, for pressing the rotation center of the tape reel in the axial direction. This is a tape storage box provided with a reel presser spring, and the reel press spring is superimposed on the inner surface of the box body, and a thin plate-like support portion provided with a through hole through which a columnar protrusion protruding from the inner surface of the box body is passed. and a spring plate portion that is elastically bent from the end of the support portion toward the rotation center of the tape reel to press the rotation center, and a column-shaped spring plate portion is provided in the through hole of the support portion. In the reel press spring mounting structure in which the reel press spring is attached to the inner surface of the box body by inserting the protrusion, the tip of the columnar protrusion extends radially inward at the opening periphery of the through hole. A structure for mounting a reel presser spring in a tape storage box, characterized in that a locking piece is formed that extends toward the side.