JPH0533376U - Tape reel - Google Patents

Abstract

(57) [Summary] [Structure] An annular portion 5 (outer diameter D2), which is slightly smaller than the opening 12 (diameter D0) of the lower half 10, is formed so as to project, and the outer diameter of the opening 12 of the lower half 10 is 12 With a slightly smaller diameter,
Moreover, when the reel stand 14 moves backward, the opening 1 of the lower half 10
The tape reel 1 is characterized in that a step 6 (outer diameter D1) having an inclined surface 6a for centering the tape reel 1 by slidingly contacting the tape 2 is attached to the outer peripheral surface of the annular portion 5. [Effect] Since the step portion 6 of the tape reel fits into the hole 12 of the lower half when not in use, the rattling in the lateral direction of the tape reel becomes minute and the lateral displacement of the tape reel can be prevented. Further, when the tape reel 1 descends together with the reel stand 14, the inclined surface 6a of the tape reel slides into the opening 12 of the lower half, so that the centering of the tape reel 1 can be achieved.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a tape cassette, particularly a tape reel suitable for a VHS-C (registered trademark) tape cassette.

[0002]

[Prior Art]

 A magnetic tape cartridge is described in Japanese Utility Model Publication No. 62-6618. This magnetic tape cartridge has engagement grooves 13 ... Engraved in the bottom wall of the main body case 1, and the lower flange 9 engages with these engagement grooves 13. A brake mechanism is provided to prevent the tape reel 4 from idling by fitting the protrusions (engaging ridges) 14 ...

As shown in FIG. 5 and FIG. 6 of the publication, a guide inclined surface 16 is formed at the tip of the engaging projection 14, and a guide inclined surface 15 is formed in the engaging groove 13, respectively. By sliding the inner inclined surface 16 onto the tape 15, the tape reel 4 is always returned to the center so that the brake operating state described above is maintained. Hereinafter, this action is called centering.

[0004]

[Problems to be solved by the device]

 On the other hand, when the tape reel 4 is laterally displaced by an external force or vibration, the guide inclined surface 16 may slide up the guide inclined surface 15, and as a result, the braking force may decrease and the tape reel 4 may slip.

Therefore, there is a demand for a tape reel structure having a large centering function while coping with lateral displacement of the tape reel.

[0006]

[Means for Solving the Problems]

 In order to meet the above-mentioned demands, the present invention has a tape reel in which an annular portion having a diameter smaller than that of the opening of the lower half is formed to project, and the outer diameter is slightly smaller than the opening of the lower half, and the reel stand is It is characterized in that a step portion having an inclined surface for centering the tape reel by slidingly contacting the opening of the lower half when retreating is attached to the outer peripheral surface of the annular portion.

[0007]

[Action]

 In the unused state, the tape reel step is fitted into the hole in the lower half, so the rattling in the lateral direction of the tape reel is very small, and the brake will not come off with some vibration.

Further, even when the tape reel descends together with the reel stand or the step portion tries to ride on the opening of the lower half due to a large impact, the inclined surface of the tape reel comes into sliding contact with the opening of the lower half, and Center the reel and return to the braking state.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. The drawings should be viewed in the direction of the reference numerals.

FIG. 1 is a cross-sectional view of a tape reel according to the present invention. The tape reel 1 comprises a cylindrical portion 2 with an upper flange 3 fused to it, and a lower portion 4 of the cylindrical portion 2 integrally formed with a lower flange 4. An annular portion 5 is formed on the lower surface of the lower flange 4 so as to project.

Further, a step portion 6 which is shorter than the annular portion 5 is attached to the outer peripheral surface of the annular portion 5, and the ridge portions 7 are radially formed outside the step portion 6. . The ridges 7 ... Engage with the groove of the lower half.

Further, as shown in the figure, the inclined surface 6a of the stepped portion 6 has an inclination angle θ of an obtuse angle (preferably 120 ° to 140 °). The outer diameter D1 of the stepped portion 6 is slightly smaller than the diameter D0 of the opening of the lower half described in FIGS. 2 (a) to 2 (c), and the outer diameter D2 of the cylindrical portion 2 is the outer diameter of the lower half. It is sufficiently smaller than the diameter D0 of the hole 12.

The operation of the tape reel having the above configuration will be described below.

2 (a) to 2 (c) are operation diagrams of the tape reel of the present invention, and FIG. 2 (a) shows an unused tape reel, in which the ridge 7 of the lower flange of the tape reel 1 is shown. ... meshes with the recessed grooves 11 of the lower half 10 to generate a predetermined braking force. At this time, since the difference between the diameter D0 of the opening 12 of the lower half 10 and the outer diameter D1 of the step portion 6 on the tape reel side is small, the gap t1 becomes small, the rattling of the tape reel 1 is small, and some impact is generated. But you can keep the brakes.

When the tape cassette is mounted on a tape deck (not shown), the reel table 14 on the tape deck side pushes up the tape reel 1 as shown in FIG. 2B. The ridges 7 of the tape reel 1 are disengaged from the concave grooves 11 of the lower half 10 and the braking force disappears and the tape reel 1 is allowed to rotate. At this time, the gap t2 between the annular portion 5 and the opening 12 of the lower half becomes equal to the standard value determined conventionally.

When the center of the tape reel 1 is not aligned with the center of the reel base 14, the center of the tape reel 1 follows the center of the reel base 14.

Therefore, when the reel stand 14 descends, the stepped portion 6 of the tape reel 1 may ride up on the opening 12 of the lower half 10 as shown in FIG. 2C.

However, since the inclined surface 6a of the stepped portion 6 is a moderately inclined surface, the tape reel 1 descends while self-centering as shown by the arrow, and as a result, the state shown in FIG. 2A is set.

That is, in the tape reel 1 of this embodiment, a large displacement due to the relative movement of the reel base 14 is absorbed by the gap t2. On the contrary, it is characterized in that a small gap t1 is formed between the opening 12 of the lower half 10 and the tape reel 1 when not in use. Also, when a large impact is applied to the tape reel 1 while it is not used and the step portion 6 tries to ride on the opening 12, the same effect can be obtained.

FIG. 3 is a cross-sectional view of a main part of a tape reel according to another embodiment of the present invention. In this tape reel 21, one end of the inclined surface 22 a of the step portion 22 is aligned with the end surface of the annular portion 5. There is a feature here.

The tape reel 21 shown in FIG. 3 is slightly uncompressed when not in use as compared with the tape reel 1 shown in FIG. 1, but the tape reel 21 moves laterally and descends as the reel stand rises. Centering becomes smoother as the inclined surface 22a is longer.

The tape reels 1 and 21 are suitable for a small tape cassette, but can be applied to a standard tape cassette.

Further, the stepped portions 6 and 22 may have a perfect circular ring shape in a plan view, or may have a radial sawtooth shape.

[0024]

[Effect of the device]

 As described above, the present invention forms an annular portion that is slightly smaller than the opening of the lower half, and has an outer diameter slightly smaller than the opening of the lower half, and when the reel stand moves backward. Since a stepped portion having an inclined surface for centering the tape reel by sliding contact with the opening of the lower half is attached to the outer peripheral surface of the annular portion, the tape reel stepped in the opening of the lower half when not in use. By fitting the parts together, the rattling in the lateral direction of the tape reel becomes small, and the lateral displacement of the tape reel can be prevented. Also, when the tape reel lowers along with the reel stand or when a large impact is applied, and the tape reel step portion tries to climb into the lower half opening, the tape reel sloped surface The tape reel can be centered by sliding contact with the opening.

[Brief description of drawings]

FIG. 1 is a sectional view of a tape reel according to the present invention.

FIG. 2 is an operation diagram of the tape reel according to the present invention.

FIG. 3 is a sectional view of a main part of a tape reel according to another embodiment of the present invention.

[Explanation of symbols]

1 ... tape reel, 5 ... annular portion, 6 ... step portion, 6a ...
Inclined surface, 7 ... ridge, 10 ... lower half, 11 ... concave groove, 12 ... open hole, 14 ... reel stand.

Claims (1)

[Scope of utility model registration request] 1. A tape reel in which a convex strip engages with a groove in the lower half of a tape cassette to prevent idling, and a reel stand that moves up and down a fixed amount on a reel stand penetrating through an opening in the lower half, This tape reel has a circular ring portion that is slightly smaller than the opening of the lower half and projects outward, and has an outer diameter slightly smaller than the opening of the lower half and the opening of the lower half when the reel stand retracts. A tape reel characterized in that a step portion having an inclined surface for centering the tape reel by sliding contact is attached to an outer peripheral surface of the annular portion.