JP3360361B2 - Impedance roller assembly for video tape recorder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an impedance roller assembly for a video tape recorder.

[0002]

2. Description of the Related Art As disclosed in Japanese Utility Model Publication No. Sho 61-5636, for example, a video tape recorder is provided with an impedance roller assembly in front of a loading roller on a tape supply side. The solid is a shaft, an upper flange attached to the top of this shaft, a lower flange attached to the bottom of the shaft,
A roller disposed between the upper and lower flanges and rotatably mounted on a shaft, and a flywheel fitted and fixed to the upper end of the roller, the jitter of the tape supplied to the guide drum is provided. Is to be deterred.

[0003]

In the impedance roller assembly as described above, the upper end of the roller is press-fitted into the center hole of the flywheel with an interference, and the flywheel is fitted to the upper end of the roller. , It is fixed, but when thermal fluctuations are repeatedly applied to the fitting and fixing part, stress relaxation occurs there and there is no interference,
The flywheel may not be securely fixed at the upper end of the roller, and the flywheel may fall out of the upper end of the roller, and in some cases, the flywheel may not rotate even if the roller is rotated.

[0004] The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a method in which a flywheel is connected to one end of a roller even if the flywheel is fitted to the roller and stress is reduced in a fixed portion. An object of the present invention is to provide an impedance roller assembly for a video tape recorder, which can eliminate the situation of slipping out of the flywheel and does not cause the rotation lock phenomenon of the flywheel.

[0005]

According to the present invention, the object is to provide a shaft, an upper flange mounted on an upper portion of the shaft, a lower flange mounted on a lower portion of the shaft, and a space between the upper and lower flanges. Roller set for a video tape recorder, comprising: a synthetic resin roller rotatably mounted on a shaft disposed on a shaft; and a flywheel fitted and fixed to the roller near one end surface of the roller. A groove is formed on the outer circumferential surface on one end surface side of the roller, the groove extending in the circumferential direction of the roller, and a side surface of the flywheel located on one end surface side of the roller from one end surface of the roller. The roller is pressed into the flywheel so that the distance from the roller to one end of the roller is longer than the distance from the one end of the roller to the open end of the groove located on the one end of the roller .
The groove is the part of the roller pressed into the flywheel.
And one end face of the roller from one end face of the roller.
Between the roller section up to the open end of the groove
This is achieved by an impedance roller assembly for a video tape recorder which is arranged so as to be recessed from the outer circumferential surface of the portion .

The groove in the present invention may extend in the circumferential direction of the roller. In a preferred example, the groove is an endless annular groove having a continuous recess. At least one such endless annular groove or the like may be provided, but in some cases, a plurality of endless annular grooves or the like may be provided at intervals in the axial direction. The cross-sectional shape of the groove may be any of rectangular, semicircular, trapezoidal, etc., but it makes it easy to press the roller into the flywheel, but also prevents the flywheel from slipping out of the roller when used. Are preferred. The flywheel according to the present invention may be fitted and fixed to one end of the roller adjacent to either the upper flange or the lower flange, but is preferably fitted to one end of the roller adjacent to the upper flange. In this case, one end surface of the roller according to the present invention is disposed on the upper flange side.

[0007]

The impedance roller assembly of the present invention is mounted on a video tape recorder chassis via a shaft.
The tape runs in contact with the rollers of the impedance roller assembly. The roller is rotated by the contact of the running tape, which also rotates the flywheel fixed to the roller in the vicinity of one end of the roller.
During use, stress relaxation occurs in the fitting and fixing portions of the flywheel due to thermal changes and the like, but a groove formed on the outer circumferential surface of the roller causes a portion from the groove to one end surface of the roller to reduce the stress. Be unaffected.

Next, the present invention will be described in more detail based on preferred embodiments shown in the drawings. The present invention is not limited to these specific examples.

[0009]

In [Examples] Figures 1-3, an example ruby Deo tape recorder 2 impedance roller assembly 1 of the present invention is applied, the loading roller support table 3 and 4 is the position in the tape cassette 5, the chassis 6 The tape 9 of the tape cassette 5 is locked by the loading rollers 10 and 11 and pulled out of the tape cassette 5 to perform a tape loading operation. Video tape recorder 2
In this state, the supports 9 and the stoppers 13 and 14 on the left and right sides of the guide drum 12 are locked and positioned. The three-dimensional body 1 is brought into contact with an audio control head 17 and further wound around a guide drum 12 having a video head, and a pinch roller 18 and a capstan 19 are driven so as to sandwich the tape 9 and run.

The impedance roller assembly 1 includes a shaft 3 fixed to the chassis 6 at a lower end 31 by screws or press fitting.
2, an upper flange 34 fitted and fixed to the upper part 33 of the shaft 32, a lower flange 36 fitted and fixed to the lower part 35 of the shaft 32, and a distribution between the upper and lower flanges 34 and 36. Made of synthetic resin rotatably mounted on the shaft 32,
More specifically, a roller 37 made of polyacetal resin and a small-diameter portion 3 of the roller 37 close to one end face 38 of the roller 37.
9 is provided with a flywheel 40 fitted and fixed with a predetermined interference, and the outer circumferential surface 45 of the small diameter portion 39 on the one end surface 38 side of the roller 37 is provided in the circumferential direction of the roller 37. And a distance A from one end face 38 of the roller 37 to the side face 51 of the flywheel 40 located on the one end face 38 side of the roller 37 is formed.
The small diameter portion 39 of the roller 37 is aligned with the center hole 53 of the flywheel 40 so as to be longer than the distance B from the one end surface 38 of the roller 37 to the opening end 52 of the groove 46 located on the one end surface 38 side of the roller 37. It is press-fitted from the end face 38 side ,
The groove 46 is provided with the roller 37 press-fitted into the flywheel 40.
(The part corresponding to the center hole 53 of the flywheel 40)
) And one end of the roller 37 from one end surface 38 of the roller 37.
Roller 3 up to open end 52 of groove 46 located on surface 38 side
7 between the portion 62 and the outer circumferential surface of these portions.
It is also arranged with a recess . The cross-sectional shape of the endless annular groove 46 of this example is substantially trapezoidal, and one of the side walls 54 is arranged orthogonally to the axial direction, and the other side wall 55 is inclined.

In the video tape recorder 2 provided with the impedance roller assembly 1 formed as described above, the tape 9 runs in contact with the roller 37. The roller 37 is rotated by the contact of the running tape 9, whereby the flywheel 40 fixed near one end face 38 of the roller 37 is also rotated, and the flywheel 40 is rotated.
With this rotation, the jitter of the tape 9 supplied to the guide drum 12 is suppressed.

By the way, even if the fitting of the flywheel 40 and the relaxation of the fixing portion 61 occur due to the thermal change during use, and the interference at the portion 61 is reduced, the impedance roller assembly 1 of the present embodiment can be used. The endless annular groove 46 is the roller 3
7, the portion 62 from the open end 52 of the endless annular groove 46 to the one end surface 38 of the roller 37 is not affected by this stress relaxation.
The portion 62 is maintained such that its outer diameter 63 is larger than the inner diameter 64 of the flywheel 40 by the interference. Therefore, even if stress relaxation occurs in the portion 61 and the interference thereof is reduced, the flywheel 40 can be moved to the portion 62.
Is prevented from getting out of the small diameter portion 39 of the roller 37. In the endless annular groove 46 of the present example,
Since the side wall 55 is inclined, the small-diameter portion 39 of the flywheel 40 can be easily pressed into the center hole 53 of the flywheel 40, while the small-diameter portion 39 of the flywheel 40 can be easily formed because the side wall 54 is orthogonal to the axial direction. Is effectively prevented in addition to the above effects.

[0013]

According to the present invention, there is provided a groove formed on the outer circumferential surface of a roller, which is press-fitted into a flywheel.
Roller part and one end of this roller from one end face of the roller
Between the roller part up to the open end of the groove located on the surface side
At the outer circumference of these parts.
That the groove, part of one end face of the roller from the groove will not be affected by the stress relaxation, and Thus, the low
Press-fit the flywheel into the flywheel.
In addition, it is possible to prevent a situation in which the flywheel comes off from one end of the roller, and it is possible to eliminate the occurrence of a rotation lock phenomenon or the like of the flywheel.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of one preferred embodiment of the present invention.

FIG. 2 is an explanatory diagram of a video tape recorder including the impedance roller assembly of the specific example shown in FIG.

FIG. 3 is a partially enlarged view of the specific example shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Impedance roller assembly 32 axis 34 upper flange 36 lower flange 37 roller 40 flywheel 46 endless annular groove

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) G11B 15/60

Claims (3)

(57) [Claims] A shaft, an upper flange mounted on an upper portion of the shaft, a lower flange mounted on a lower portion of the shaft,
A video comprising a synthetic resin roller disposed between the upper and lower flanges and rotatably mounted on a shaft, and a flywheel fitted and fixed to the roller near one end surface of the roller. An impedance roller assembly for a tape recorder, the outer circumferential surface on one end side of the roller,
A groove extending in the circumferential direction of the roller is formed, and a distance from one end surface of the roller to a side surface of the flywheel located on one end surface side of the roller is from one end surface of the roller to one end surface side of the roller. The roller is press-fitted into the flywheel so as to be longer than the distance to the open end of the groove located, and the groove is formed by the roller press-fitted into the flywheel.
Part and one end face of this roller from one end face of the roller.
Between the roller and the open end of the groove to be placed.
An impedance roller assembly for a video tape recorder disposed so as to be recessed from the outer circumferential surface of these portions . 2. The video tape recorder impedance roller assembly according to claim 1, wherein the groove is an endless annular groove. 3. The impedance roller assembly for a video tape recorder according to claim 1, wherein one end surface of the roller is disposed on the upper flange side.