JPS5850547Y2 - tape cassette - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a tape cassette that is improved so that the magnetic tape can run smoothly.

Conventionally, in tape cassettes, the tape has often been wound irregularly due to vibrations, shocks, etc., and the tape has been wound in stages during fast forwarding and rewinding because the tape is wound at high speed.

As a result, tape running becomes heavy and unstable. Especially in small tape cassettes called micro cassettes, the distance from the tape feed point of the tape hub to the magnetic head is short, so the tape running position cannot be fully regulated by the tape guide and during playback. , there were inconveniences such as the azimuth being shifted between the A side and the B side.

Japanese Utility Model Publication No. 50-6358 shows a device in which ribs are provided on the inner surface of the cassette half to eliminate the need for a liner sheet, but in this case, the width of the tape winding surface of the tape hub is set on the upper and lower cassette halves. Because the distance is shorter than the distance between the ribs and there is no liner sheet, there is a drawback that play occurs between the tape hub and the cassette half at the beginning or end of tape winding, causing the tape to wind erratically.

Liner sheet 1 for the one published in Utility Model Publication No. 50-6358
A conceivable example of a compact tape cassette in which the tape is inserted and the tape runs smoothly is shown in FIG.

However, in this case, there are two ribs on the inside of the cassette half.
are provided, so the vertical movement of the tape is less than in the case without them. However, since the width of the tape winding surface of the tape hub is shorter than the distance between the ribs provided on the upper and lower cassette halves, tape 3 is attached to the tape hub. 4 and held in the cassette half 5.

Therefore, depending on the accuracy of the tape hub, the tape hub may move up and down, making the tape running unstable.

This invention solves the above-mentioned drawbacks, stabilizes tape running, eliminates drawbacks such as azimuth deviation between sides A and B, and provides a tape cassette that can be converted to L, Hi-Fi, etc. purpose.

This invention will be explained in detail below with reference to the drawings.

FIG. 2 is a diagram showing the tape cassette of this invention with the upper half removed.

A reel hub receiving ring portion 12.1 is provided on the inner wall surface of the lower half 11.
Ribs 14°15.16,1 extending radially from the vicinity of 3
7 and ribs 18 are provided parallel to the longitudinal direction of the lower half 11.

These ribs 14, 15, 16, 17, and 18 are shown in FIG. 3, which is a cross section taken along line A-A in FIG. A rib 14 provided on the inner surface of the upper and lower halves so that the
, 14' is approximately equal to the tape width, and is shorter than the width of the tape winding surface of the tape hub.

That is, the height of the rib 14 is higher than the height of the hub-receiving top portion 12 of the cassette half by H.

During assembly, the liner sheet 21 placed on these ribs 14, 15, 16, 17, 18 is positioned by the positioning pins 22, 23 of the liner sheet.

This liner sheet 21 is left-right asymmetrical and shaped almost like a swallowtail butterfly, and the elongated parts 21 a and 2 l b divided into two at the bottom intersect between the pad spring 24 and the fulcrum of this pad spring 24 and the pad. It extends to the position where

Further, on the liner sheet 21, a tape hub 19 positioned by the hub receiving ring portions 12 and 13,
19' is fitted, and the tape 25 with its end fixed to this tape hub 19 is transferred from one tape hub 19 to the other via guide pins 26, 27, 28, 29° 30.31 and guide rollers 32.33. The tape is wound around the tape hub 19'.

Elongated portions 21 a, 2 l b of the liner sheet 21
A pad spring 24 is placed on top of B- in FIG.
As shown in FIG. 4, which is the B cross section (however, the cross section when combined with the upper half), the height is such that the distance d between the ribs 18 and 18' is shorter than the width C of this pad spring 24. Ribs 18, 18' are formed on the sides.

The liner seat holder provided on the lower half 11 is connected to the pin 3
4 is a cross section taken along the line C-C in FIG. 2 (however, this is the cross section when combined with the upper half).As shown in FIG. 5, its height is higher than the top of the rib 14' provided on the upper half 11'. It is further increased by a length h.

The liner sheet holder of the upper half 11' is connected to the pin 34',
A similar relationship exists with the ribs 14 provided on the lower half 11.

With the above structure, when the tape cassette of this invention is assembled, as shown in FIG. be able to.

Therefore, there is almost no vertical movement of the tape when it runs.

In addition, the liner sheets 21, 21' have tape wrapping surfaces 2
Since these sheets are forcibly bent outward near zero, an elastic force is generated in these sheets in a direction that grips the tape hub 19.

Therefore, since the tape hub is received in a sandwiched state by the upper and lower liner sheets rather than by the hub receiving ring of the cassette half, the tape hub does not move up and down when the tape runs, and is held at the center of the tape hub.

Therefore, the amount of tape wound around the tape hub is reduced, and stable running is ensured even if the tape is not directly received by the ribs through the liner sheet.

Further, as shown in FIG. 4, the ribs 18, 18' and the pad spring 24 force the length portions 21b, 21b of the liner sheet 21, 21' to curve.

That is, since the liner sheet 21 is incorporated with elasticity, when the tape is wound around the tape hub, it is constantly pressed by the liner sheet and wound, so that no irregular winding occurs.

Moreover, the liner sheet has an elongated portion 21a. 21b is in contact with the pad spring 24, so the curved state is
It remains stable.

On the other hand, since the pad spring 24 is held in a sandwiched state by the liner sheet, the pad spring itself is positioned in the center, and the positional relationship between the pad 24a t 24b and the head is favorable.

Furthermore, as shown in FIG. 5, even if the liner sheet itself is slightly spaced apart during assembly, the liner sheet holder is fixed to the liner sheet 21, 21 by the pins 34, 34'.
' the lower corners of each are curved outwards, so that
- After the carrier tape is separated from the tape hub, the side surface of the tape does not come into contact with the liner sheet again, and the tape is fed out in a stable state.

Furthermore, when the tape is wound around the tape hub, even if the tape moves up and down to some extent, the position of the tape is corrected along the curved portion of the liner sheet as it is wound, and the tape is wound up in an orderly manner.

As described above, the tape cassette of this invention mainly has the distance between the ribs provided on the inner walls of the upper and lower cassette halves shorter than the width of the tape winding surface of the tape hub to directly hold the tape and to The liner sheet is curved toward the outside of the cassette half near the surface, and the liner sheet has elasticity to hold the tape, so that winding disorder does not occur when the tape is wound.

Further, since the tape hub is also held between the liner sheets, the tape hub is always held in the center and a constant load torque is applied regardless of the amount of tape wound around the tape bub.

Therefore, there is almost no vertical movement of the tape as it runs, and appropriate back tension is applied.
There is no need for the tape to be wound in stages or for the azimuth of sides A and B to be out of order, making it possible to make the tape cassette Hi-Fi.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a conventional tape cassette. FIG. 2 is a diagram showing the tape cassette of this invention with the upper half removed. Figures 3, 4, and 5 are the A-A cross section and the B-B cross section of the upper half of the tape cassette in Figure 2 assembled, respectively.
It is a figure showing a -B cross section and a CC cross section. 11...Lower half, 11'...Upper half, 12゜13...Reel hub receiving ring, 14
, 15 , 16° 17.18... Rib, 19
, 19'...Tape winding surface, 21.21'...
... Liner sheet, 20 ... Tape wrapping surface.

Claims (1)

[Scope of utility model registration request] The upper and lower cassette halves are provided with a required number of ribs provided near the reel hub receiving top on the inner wall surface, a tape hub, and a liner sheet, and when the upper and lower cassette halves are assembled, the distance between the ribs is The width should be shorter than the width of the tape winding surface of the tape hub, and
A tape cassette characterized in that the liner sheet inserted between the rib and the tape winding surface is bent toward the inner wall surface of the cassette half in the vicinity of the tape winding surface.