JPH05314720A - Tape cassette - Google Patents

Abstract

PURPOSE:To enable a stable tape running by forming a guide roller of the tape cassette with two pieces structure consisting of an inner ring and outer ring and providing an automatic core adjusting function of the outer ring, even if the inner ring is inclined against a cassette half. CONSTITUTION:The guide roller 1 consists of the inner ring 2 which is supported by supporting shafts 13, 14 erected on the cassette half 10 and forming annular recessed grooves 4 in the circumferential direction of the outer periphery of the center part, and the outer ring 3 provided with the automatic core adjusting function, the outer peripheral surface of which is made to a tape guide surface, having the annular projecting parts 5 to engage with the annular recessed grooves 4 of the inner ring 2 in the circumferential direction of the inner periphery of the center part also being inserted and fixed so as freely rotatable around the annular projecting parts 5 and capable of oscillating against the inner ring 2, then a clearance (g) for the outer diameter of inner ring 2 and the inner diameter of outer ring 3 is set to the range of 0.06-0.08mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette used in a recording / reproducing apparatus such as a video tape recorder, and more particularly to a cassette half having a pair of tape reels around which a tape such as a magnetic tape is wound. The present invention relates to a guide roller that is disposed inside and that guides the traveling of a tape wound between tape reels.

[0002]

2. Description of the Related Art Conventionally, a tape cassette used in a recording / reproducing apparatus such as a video tape recorder is a cassette in which a pair of upper and lower halves 51 and 52 are abutted to each other as shown in FIG. A pair of tape reels 5 in which the magnetic tape T is wound in the half 50.
4, 55 are rotatably supported.

The magnetic tape T accommodated in the cassette half 50 is exposed to the outside through the tape pull-out openings 57 and 58 formed on both sides of the front side of the cassette half 50 covered by the rotary lid 56. The cassette half 50 is partially extended to the front side.

When the tape cassette is inserted into the recording / reproducing apparatus, the above-described magnetic tape T is rotated by the rotating lid 56 to open the front side of the cassette half 50 and to be arranged on the recording / reproducing apparatus side. The tape loading mechanism provided automatically pulls out the cassette half 50 and loads it onto a predetermined tape running path. Therefore, on the front side of the cassette half 50, there is provided a loading mechanism entrance recess 59 facing the tape loading mechanism for pulling out the magnetic tape T.

The magnetic tape T, which is drawn out of the cassette half 50 and runs, is located at a position near each of the tape drawing openings 57 and 58 in the cassette half 50.
Guide rollers 60, 60 made of a synthetic resin molding material for guiding the traveling of the bearing are supported. In the vicinity of the guide rollers 60, 60, the tape guides 61, 6 are further provided.
1 is planted.

As a result, the pair of tape reels 54,
The magnetic tape T, which is wound between 55, is fed from one tape reel 54 on the supply side to one guide roller 60.
Through the opening 57 for pulling out one of the tapes to the front side of the cassette half 50, travels along a predetermined tape running path and enters the cassette half 50 through the opening 58 for pulling out the other tape, The other guide roller 60
The other tape reel 5 which is guided to the winding side and becomes the winding side.
Drive so that it is wound around 5.

[0007]

By the way, the guide roller 60 configured as described above is generally fixed to the cassette half 50. However, it is difficult to fix the guide roller 60 of this kind to the cassette half 50 without any inclination with respect to the cassette half 50. Therefore, the guide roller 60 is allowed to have a maximum tilt of 0.1 mm in G-spec.

However, since the magnetic tape T comes into contact with the above-mentioned inclined guide roller 60 and travels, the magnetic tape T moves in the inclination direction of the guide roller 60, and the magnetic tape T rides on the end portion of the roller. However, there is a problem that the magnetic tape T is bent and the tape edge is damaged.

The present invention has been made in order to solve the above-mentioned problems, and an object thereof is to obtain a tape cassette provided with a guide roller on which a magnetic tape can stably travel.

[0010]

In order to achieve the above-mentioned object, the tape cassette according to the present invention is provided with guide rollers for guiding the running of the tape, which are provided on both sides of the front surface of the cassette half where the tape is pulled out. In the tape cassette equipped with, the guide roller is composed of an inner ring supported by a support shaft planted in the cassette half and an outer ring having an outer peripheral surface inserted into the tape guide surface and the inner ring without the outer ring with respect to the inner ring. It has a self-aligning function that is rotatable and swingable around the engaging portion between the concave groove formed in each circumferential direction and the protruding portion as a fulcrum, and has a clearance between the outer diameter of the inner ring and the inner diameter of the outer ring. It is set in the range of 0.06 to 0.08 mm.

[0011]

The tape cassette of the present invention constructed as described above comprises an inner ring fixed to the cassette half and an outer ring rotatably and swingably inserted to the inner ring.
The clearance between the outer diameter of the inner ring and the inner diameter of the outer ring is 0.06 ~
By setting the range of 0.08 mm, if the inner ring is fixed to the cassette half in a tilted state within the standard range, the outer ring acts on the inner ring with the self-centering function, It can be set to a state without tilt. As a result, the magnetic tape can stably travel along the guide roller.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view of a main part of a tape cassette to which the present invention is applied. This tape cassette is also similar to the conventional case described above, and the guide roller is provided in the cassette half for opening the tape withdrawing portion. It is located at each vicinity.

The structure of the cassette half and the guide roller will be described in detail below. The cassette half 10 is a pair of upper and lower halves 1 formed by molding synthetic resin.
1 and 12 are butted and joined. A support shaft 13, which integrally protrudes from the upper and lower halves 11 and 12,
A guide roller 1 made of a synthetic resin member according to the present invention is attached to 14.

The guide roller 1 has a two-piece structure including a cylindrical inner ring 2 and a similarly cylindrical outer ring 3 having an inner diameter slightly larger than the outer diameter of the inner ring 2. The upper and lower open ends are the upper and lower halves 1 described above.
The support shafts 13 and 14 of 1 and 12 are non-rotatably fixed by, for example, a method such as press fitting. An annular groove 4 as an engaging portion is formed in the circumferential direction at the center of the outer peripheral surface of the inner ring 2. On the other hand, in the outer ring 3, the distal end of an annular protrusion 5 as an engaging portion formed at the center of the inner peripheral surface of the outer ring 3 is engaged with the annular groove 4 of the inner ring 2 so that the outer ring 3 with respect to the inner ring 2 has an annular protrusion. A centering function is provided which is rotatable about 5 and swings.

A clearance g is formed between the outer diameter of the inner ring 2 and the inner diameter of the outer ring 3 to allow the swinging of the outer ring 3 described above. This clearance g is the inner ring 2
Is a clearance in which the outer ring 3 is subjected to the self-aligning function with respect to the inclination within the standard and the inclination is zero.

The clearance g described above as an example can be obtained from the schematic diagram of FIG. Magnetic tape T now
Has a tape width of 12.7 mm, the inner ring 2 has a total length of 16 mm, and the inner ring 3 has a maximum of 0.1 m with respect to the magnetic tape T.
When inclined by m, the inclination of the inner ring 2 with respect to the magnetic tape T is 0.45 °. At this time, the inclination of the end portion of the inner ring 2 is about 0.1256 mm from the position perpendicular to the magnetic tape T. Therefore, as shown in FIG. 2, the clearance g for the outer ring 3 to have zero inclination with respect to the inclination of the inner ring 2 is set to 0.06 to 0.08 mm in consideration of some margin.

As described above, in the tape cassette according to the present invention, if the inner ring 2 is fixed to the cassette half 10 in a tilted state within the standard range, the outer ring 3 is fixed to the inner ring 2.
However, the automatic centering function works so that the cassette half 10 can be set so as not to be tilted. As a result, the magnetic tape T can stably run along the outer ring 3.

The present invention is not limited to the embodiments described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention. For example, in the embodiment as an engaging portion between the inner ring 2 and the outer ring 3, an annular groove 4 is formed on the outer peripheral surface on the inner ring 2 side, and an annular protrusion 5 is formed on the inner peripheral surface on the outer ring 3 side.
However, conversely, an annular projection may be provided on the outer peripheral surface on the inner ring 2 side and an annular groove may be formed on the inner peripheral surface on the outer ring 3 side. Further, the engaging portion between the inner race 2 and the outer race 3 may be an engaging means other than the annular groove 4 and the annular protrusion 5. Further, although the tape cassette of the video tape recorder has been described as an example of the recording / reproducing apparatus, it can be widely applied to tape cassettes of other recording / reproducing apparatuses.

[0019]

As described above, in the tape cassette of the present invention, the guide rollers, which are respectively disposed on both sides of the front side of the cassette half where the tape is pulled out, and which guide the tape traveling, are set in the cassette half. The inner ring supported by the supported support shaft and the outer ring having the outer peripheral surface inserted into the inner ring without the tape guide surface and the inner ring, and the outer ring being engaged with the groove formed in each circumferential direction with respect to the inner ring and the protrusion. It has a self-centering function that is rotatable and swingable around the joint, and the clearance between the outer diameter of the inner ring and the inner diameter of the outer ring is 0.06
If the inner ring is tilted within the standard range with respect to the cassette half by setting the range to 0.08 mm,
The outer ring can be set so that it does not tilt with respect to the cassette half by the self-aligning function of the inner ring against the inner ring. As a result, the tape can run stably along the guide roller and is highly reliable. It becomes a tape cassette.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a tape cassette according to the present invention.

FIG. 2 is a cross-sectional view of a main part of a tape cassette in which an inner ring of a guide roller is in a tilted state.

FIG. 3 is a schematic diagram for setting a clearance between an inner ring and an outer ring of a guide roller.

FIG. 4 is an exploded sectional view showing an example of a conventional tape cassette.

[Explanation of symbols]

 1 Guide roller 2 Inner ring 3 Outer ring 4 Annular concave groove 5 Annular protrusion 10 Cassette half 11 Upper half 12 Lower half 13,14 Support shaft g Clearance

[Procedure amendment]

[Submission date] July 2, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction content]

The magnetic tape T, which is drawn out of the cassette half 50 and runs, is located at a position near each of the tape drawing openings 57 and 58 in the cassette half 50.
Fixed guide roller 6 made of metal to guide the running of
0,60 are supported.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

As a result, the pair of tape reels 54,
The magnetic tape T wound around 55 is fed from one tape reel 55 on the supply side to one guide roller 60.
Through the opening portion 58 for pulling out one tape to the front side of the cassette half 50, travels along a predetermined tape running path, and enters the cassette half 50 through the opening portion 57 for pulling out the other tape, The other guide roller 60
The other tape reel 5 which is guided to the winding side and becomes the winding side.
Run so that it will be wound around 4 .

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

The guide roller 1 has a two-piece structure including a cylindrical inner ring 2 and a similarly cylindrical outer ring 3 having an inner diameter slightly larger than the outer diameter of the inner ring 2. The upper and lower open ends are the upper and lower halves 1 described above.
The support shafts 13 and 14 of 1 and 12 are non-rotatably fixed by, for example, a method such as press fitting. An annular groove 4 as an engaging portion is formed in the circumferential direction at the center of the outer peripheral surface of the inner ring 2. On the other hand, the outer race 3 is engaged with the annular projection 5 as an engaging portion formed at the center of the inner peripheral surface of the inner race 2 so that the leading end portion of the annular projection 5 has a gap between the upper and lower portions of the annular groove 4 of the inner race 2. In contrast to 2, the outer ring 3 is rotatable about the annular projection 5 and is provided with a self-aligning function of swinging.

[Procedure amendment 4]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

[Procedure Amendment 5]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

Claims (2)

[Claims] 1. A tape cassette provided with guide rollers arranged on both sides of a front surface of a cassette half where the tape is pulled out, for guiding the running of the tape, wherein the guide rollers are planted in the cassette half. The inner ring supported by the support shaft, and the outer ring that has the outer peripheral surface not serving as the tape guide surface and is inserted and attached to the inner ring.The outer ring has the engaging portions formed in the respective circumferential directions with respect to the inner ring as fulcrums. A tape cassette having a self-aligning function that is rotatable and swingable, and a clearance between the outer diameter of the inner ring and the inner diameter of the outer ring is set in the range of 0.06 to 0.08 mm. .. 2. The tape cassette according to claim 1, wherein the engaging portion includes a concave groove and a protrusion that engages with the concave groove.