JPH05151662A - Tape roller guide - Google Patents

Abstract

PURPOSE:To prevent the insertion of a magnetic tape in between an upper flange and a roller in the tape roller guide used for the tape loading mechanism of a magnetic recording/reproducing device. CONSTITUTION:A roller guide 20 is provided with upper and lower flanges 52 and 54 and a roller 56 fitted between the flanges 52 and 54 rotably around a shaft. Annular collars 60 are provided on the peripheral parts of the flanges 52 and 54 in the roller guide 20 and the movement of a tape 10 engaged with the roller 56 in the shaft direction along the roller 56 is prevented by this collar 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape roller guide suitable for use in, for example, a tape loading device of a rotary head type magnetic recording / reproducing apparatus.

[0002]

2. Description of the Related Art FIG. 4 shows an M loading type tape loading mechanism used in, for example, a rotary head type magnetic recording / reproducing apparatus.

FIG. 1 shows the case where the tape loading mechanism is in a loading mode for recording or reproducing. The magnetic tape 10 is supplied from the supply reel 14S mounted in the tape cassette 12 to the drum 16
And is taken up by the take-up reel 14T mounted in the tape cassette 12 from the drum 16.

The magnetic tape 10 supplied from the supply reel 14S includes a guide 30S arranged inside the tape cassette 12, a first guide 30A arranged outside the tape cassette 12, a second guide 30B and a third guide. Thirty
C, full width erasing head 32, impedance roller 34,
The drum 1 is passed through the roller guide 20S and the tilt guide 22S.
6 is reached. The magnetic tape 10 ejected from the drum 16 includes an inclined guide 22T, a roller guide 20T, an audio erasing head 36, an audio and CTL head 38, a capstan 40 and a pinch roller 42, a fourth guide 30E,
The tape reaches the take-up reel 14T via the guide 30T arranged in the tape cassette 12.

The supply side roller guide 20S and the tilt guide 22S are mounted on a shuttle plate 24S to form a supply side shuttle block 18S, and the winding side roller guide 20T and the tilt guide 22T are mounted on the shuttle plate 24T. Shuttle block 18 on the winding side
Make up T.

The shuttle block 18S on the supply side moves along the shuttle rail 26S on the supply side, and the shuttle block 18T on the take-up side moves on the shuttle rail 26 on the take-up side.
It is configured to move along T.

FIG. 5 shows the structure of a roller guide 20 according to the prior art. The roller guide 20 includes a shaft 50 and the shaft 50.
And a roller 56 rotatably mounted around the shaft 50 between the upper flange 52 and the lower flange 54, and between the flanges 52, 54.

An annular gap 64 extending in the radial direction is formed between the flanges 52, 54 and the roller 56.

The upper flange 52 is attached to the upper end of the shaft 50 by means such as a screw, and the lower flange 54.
Is secured to the underside of roller 56 by suitable securing means 58.

When the tape loading mechanism is operated in the loading mode, the magnetic tape 10 travels by the rotation of the roller 56 while engaging with the roller 56. While running, the magnetic tape 10 slides on the roller 56 along the axial direction when it receives a biasing force in the axial direction of the roller guide 20, but the upper flange 52 restricts the upward movement of the magnetic tape 10 and the lower flange 54 lowers the magnetic tape 10. Exercise is restricted.

[0011]

However, as shown in FIG. 6, when the magnetic tape 10 moves on the roller 56 due to the biasing force in the axial direction, the edge of the magnetic tape 10 causes the upper flange 52 and the roller 56 to move. May enter the gap 64 between the edges of the magnetic tape 10, which damages the edges of the magnetic tape 10 and shortens its life.

FIG. 7 shows a conventional roller guide 2 shown in FIG.
It is a cross-sectional view of No. 0, and the process in which the magnetic tape 10 enters the gap 64 will be described with reference to these drawings. Roller guide 20
The upper flange 52 has a cylindrical outer surface 52A, a lower side surface 52B perpendicular to the axis, and an upper side surface 52C.

The magnetic tape 10 travels by the rotation of the roller 56 while engaging with the peripheral surface of the roller 56 at the central angle θ. The magnetic tape 10 has a portion that crosses the lower side surface 52B of the upper flange 52 on both sides of such an engaging portion with a length L, and when the magnetic tape 10 is displaced in the axial direction during traveling, The portion of such central angle θ and the length L
The edge portion of the portion comes into contact with the lower side surface 52B.

When the magnetic tape 10 is further biased in the axial direction by the biasing force, the edge portion of the portion of the magnetic tape 10 having the central angle θ can be bent into the gap 64 as shown in FIG. This is because the edge portion of the length L of the magnetic tape 10 is bent at the same time.

It is conceivable to make the gap 64 between the lower side surface of the upper flange 52 and the upper end face of the roller 56 smaller than the thickness of the magnetic tape 10 so that the magnetic tape 10 does not enter the gap 64. However, it is difficult when the thickness of the magnetic tape 10 is extremely small.

In view of the above point, the present invention is such that, in the roller guide 20 used in the tape loading device of the magnetic recording / reproducing apparatus, the magnetic tape 10 does not enter the gap between the upper flange 52 and the roller 56. The purpose is to do so.

[0017]

SUMMARY OF THE INVENTION In accordance with the present invention, a roller guide 20 having an upper flange 52, a lower flange 54, and a roller 56 mounted between the flanges 52,54.
In this case, the flanges 52 and 54 have an annular collar portion 60 on their peripheral portions, and the collar portion 60 prevents the tape 10 engaging with the roller 56 from moving on the roller 56 in the axial direction thereof. Is configured to be.

[0018]

When the magnetic tape 10 engaged with the roller 56 of the roller guide 20 moves axially along the roller 56, the edge of the magnetic tape 10 abuts on the flanges 60 of the flanges 52 and 54, thereby causing magnetic force. Movement of the tape 10 in the axial direction is prevented.

The flange portions 60 of the flanges 52 and 54 have a surface 60B perpendicular to the axis line, and when the magnetic tape 10 is displaced in the axial direction while the magnetic tape 10 is running, the edge portion of the flange portion 6 is formed.
It abuts the 0 surface 60B. At this time, since the edge of the magnetic tape 10 abuts the surface 60B obliquely, the magnetic tape 10 is prevented from further moving in the axial direction and entering the gap 62.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS. In addition, in FIGS. 1 to 3, FIGS.
The same reference numerals are given to the portions corresponding to, and the detailed description thereof will be omitted.

FIG. 1 shows the structure of the roller guide 20 of this example. Each of the upper flange 52 and the lower flange 54 of the roller guide 20 has an annular collar portion 60 on its peripheral edge, and the collar portion 60 extends in the circumferential direction so as to surround the end portion of the roller 56.

FIG. 2 shows details of the upper end portion of the roller guide 20. The flange portion 60 of the upper flange 52 has an inner surface 60A and an outer surface 60C having a cylindrical surface shape, and a lower surface 60B perpendicular to an axis connecting the inner surface 60A and the outer surface 60C, and the inner surface 60A and the roller. An annular gap 62 is formed between the outer surface 56 </ b> A of 56.

In the roller guide 20 of the conventional example shown in FIGS. 5 and 6, an annular gap 64 extending in the radial direction is formed between the flanges 52, 54 and the roller 56, but in this example, the collar portion 60 is provided. It should be noted that the provision forms an axially extending annular gap 62.

FIG. 3 is a line AA of the roller guide 20 of FIG.
FIG. 4 is a cross-sectional view taken along the line of FIG. 5, and a state in which the flange portion 52 of the flanges 52, 54 prevents axial movement of the tape 10 engaged with the roller 56 will be described with reference to these drawings. ..

The magnetic tape 10 engages on the peripheral surface of the roller 56 by a central angle θ, and further extends across the lower side surface 60B of the collar portion 60 by a length L on both sides of the engaging portion. Have. When the magnetic tape 10 moves in the axial direction by the biasing force while engaging with the roller 56, the portion of the edge of the magnetic tape 10 having the length L is the lower side surface 60B.
Abut.

Even if an axial biasing force is applied to the magnetic tape 10, the portion of the length L of the magnetic tape 10 is the lower surface 60.
Further bias is prevented due to engagement with B. At this time, only the portion of the magnetic tape 10 having the central angle θ engaging with the peripheral surface of the roller 56 is further displaced in the axial direction, and the gap 6 is formed.
You can't get into 2.

In order for the magnetic tape 10 to be further biased in the axial direction, the portion of the magnetic tape 10 at the central angle θ and the length L are set.
It is necessary for the parts of the to be bent at the same time at their edges by approximately the same width, which is not achieved.

The gap 62 extending in the axial direction allows the central angle θ of the magnetic tape 10 to move in the axial direction, but prevents the magnetic tape 10 from being bent in a direction perpendicular to the axial direction, and the lower surface 60B of the collar portion 60. Is because it allows the portion of the length L of the magnetic tape 10 to be bent in a direction perpendicular to the axis, but prevents it from moving in the axis direction.

The roller guide 2 according to the conventional example shown in FIG.
0 does not have such a function as described above. That is, the radial gap 64 allows the portion of the magnetic tape 10 having the central angle θ to be bent in a direction perpendicular to the axis, but prevents the magnetic tape 10 from moving in the axial direction. Allow the length L portion of 10 to be bent in a direction perpendicular to the axis but prevent it from moving axially.

Therefore, in the conventional example, the portion of the central angle θ of the magnetic tape 10 and the portions of the length L on both sides thereof are simultaneously and substantially the same width by the radial gap 64 and the lower side surface 52B of the upper flange 52. The edge of the magnetic tape 10 can be bent further, and the magnetic tape 10 can be further displaced in the axial direction. Therefore, the portion of the magnetic tape 10 having the central angle θ is allowed to enter the gap 64.

In the conventional example, the width of the radial gap 62 must be made smaller than the thickness of the magnetic tape 10 to make the magnetic tape 1.
It is not possible to prevent 0 from entering the gap 62, but according to an example of the present invention, even if the width of the gap 62 in the axial direction is larger than the thickness of the magnetic tape 10, the above-mentioned function is not impaired. Be understood.

Although the embodiments of the present invention have been described above in detail, those skilled in the art will understand that the present invention is not limited to the above-mentioned embodiments and various other configurations can be adopted without departing from the gist of the present invention. Easy to understand.

[0033]

According to the present invention, in the tape roller guide used in the tape loading mechanism of the magnetic recording / reproducing apparatus, the magnetic tape 10 is prevented from entering between the flanges 52, 54 and the roller 56. Therefore, there is an advantage that the life of the magnetic tape 10 can be kept long.

According to the present invention, the roller guide 20 can be manufactured so that the gap 62 between the flanges 52, 54 and the roller 56 is larger than the thickness of the magnetic tape 10, so that the manufacturing process is made efficient. There is an advantage that can be.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of a roller guide according to the present invention.

FIG. 2 is a partial detailed view showing an example of a roller guide according to the present invention.

FIG. 3 is an explanatory diagram illustrating a function of a roller guide according to the present invention.

FIG. 4 is an explanatory diagram illustrating a usage example of a roller guide.

FIG. 5 is a diagram showing an example of a roller guide according to a conventional technique.

FIG. 6 is an explanatory diagram illustrating a roller guide according to a conventional technique.

FIG. 7 is an explanatory diagram illustrating a function of a roller guide according to the present invention.

[Explanation of symbols]

 10 tape 12 cassette 14 reel 14S supply reel 14T take-up reel 16 drum 18 shuttle block 20 roller guide 22 tilt guide 24 shuttle plate 26 shuttle rail 30 tension guide 32 full width erasing head 34 impedance roller 36 audio erasing head 38 audio CTL head 40 cap Stan 42 Pinch roller 50 Shaft 52 Upper flange 52A Outer side surface 52B Lower end surface 52C Upper side surface 54 Lower flange 56 Roller 56A Outer side surface 58 Fixing means 60 Collar portion 60A Outer side surface 60B Lower end surface 60C Inner side surface 62 Gap 64 Gap

Claims (1)

[Claims] 1. A tape roller guide having an upper flange, a lower flange, and a roller mounted between the two flanges and rotatable about an axis, wherein at least one of the upper flange and the lower flange has a peripheral portion. And an annular collar portion, and the collar portion is configured to prevent the tape engaging with the roller from moving along the roller in the axial direction thereof. Tape roller guide.