JP2001307398A - Method and jig for assembling pinch roller of recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily determine the size of the gap between a cap which stops a rotary bearing from falling and the upper end surface of the rotary bearing with high precision, as to a pinch roller which presses a tape against a capstan of a recording and reproducing device. SOLUTION: A jig 6 is pressed down to press a hole part 21 of the cap held by the jig 6, onto a support shaft 4. At this time, a projection 63 on the side of the jig 6 is projected downward a collar part 22 on the side of the cap 2 and the tip of the projection 63 is made to abut against the upper end surface 12 of the rotary bearing 1 to restrict the press-in margin of the cap 2. Here, the projection size L of the projection 63 is the sum of the thickness B of the collar part 22 and a proper gap size A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for assembling a pinch roller of a recording / reproducing apparatus and a jig for assembling the pinch roller.

[0002]

2. Description of the Related Art In a recording / reproducing apparatus for recording / reproducing video / audio using a magnetic tape as a medium, a capstan for feeding a tape and a pinch roller for pressing the tape against the capstan are used. -147
142 and JP-A-8-273242. JP-A-64-52133 and JP-B-1-18510 disclose a pinch roller in which a bearing type bearing fitted on a support shaft is positioned by a sleeve fitted on the support shaft. There is a description. Furthermore, Japanese Utility Model No. 3055049 also discloses that
Although there is a description of a pinch roller in which a bearing mounted in a manner fitted to a support shaft is positioned by a sleeve fitted to the support shaft, in this pinch roller, the bearing is slid with respect to the support shaft. A rotating bearing that rotates dynamically is employed.

FIG. 5 shows a main part of a pinch roller employing the rotary bearing 1, and FIG. 6 is a perspective view of a cap 2 used for the pinch roller.

In the pinch roller of FIG. 5, the lower end 4a of the support shaft 4 is press-fitted into a hole 31 of the post 3 protruding from a frame member such as a chassis (not shown) so that the support shaft 4 is inserted into the post 3. Fixed. Also, the support shaft 4
, The washer 5, the rotary bearing 1, and the cap 2 are fitted in this order, the rotary bearing 1 is slidably rotatable with respect to the support shaft 4, and the cap 2 supports the hole 21. It is attached to the support shaft 4 by press-fitting the shaft 4. Further, as shown by the phantom line in the figure, a pressing roller 10 is attached to the rotary bearing 1. Press roller 10
Has an effect of pressing the tape against a capstan (not shown). When the pressing roller 10 presses the tape against the capstan, the pressing roller 10 rotates the capstan or runs the tape. Following this, it rotates about the support shaft 4 together with the rotary bearing 1. As shown in FIG. 6, the cap 2 is formed in a cylindrical shape, has a flange 22 integrally at the lower end thereof, and
The bracket 24 is provided integrally with the cylindrical portion 23. As shown in FIG. 5, the cap 2 attached to the support shaft 4 has the lower end surface 26 of the flange 22 at the same level as the lower end surface 25 of the cylindrical portion 23 on the upper end surface 12 of the rotary bearing 1. They face each other with a gap S therebetween. Therefore, the rotary bearing 1 can be displaced in the axial direction between the washer 5 and the lower end surface 26 of the flange portion 22 by a width corresponding to the dimension A of the gap S (hereinafter referred to as “gap dimension”). The cap 2 prevents the shaft 4 from being pulled out. Note that the axial displacement of the rotary bearing 1 is "thrust play".
It is commonly called.

[0005] In such a pinch roller, if the gap A is too large, the vertical run-out width of the pressing roller 10 which rotates following the rotation of the capstan and the tape running becomes large, and the tape running performance deteriorates. Sometimes
Conversely, if the gap dimension A is too small, the rotating bearing 1 and the flange 22
The stable rotation of the pressing roller 10 may be impaired by frictional resistance caused by contact with the pressing roller 10. Therefore, the gap dimension A needs to be determined accurately and accurately.

[0006] Conventionally, a pinch roller has been assembled by the following method. That is, the washer 5 and the rotary bearing 1 are attached to the support shaft 4 attached to the post 3.
Are fitted in a fitting manner as shown in the figure, and the cap 2 is pushed down by a jig (not shown) as shown by an arrow F in FIG. At this time, the cap 2 is pushed down until the inner wall surface 27 of the hole 21 of the cap 2 abuts against the top surface 41 of the support shaft 4, and the inner wall surface 27 and the top surface 41 are brought into contact with each other. The press-fitting cost of the part 21 was regulated.

[0007]

In order to assemble the pinch roller by the conventional method and properly determine the clearance dimension A, the dimensions of each part shown in FIG. 5, that is, the depth of the hole 21 of the cap 2 are required. In addition to the requirement that the dimension D be high precision and appropriate dimensions, the thickness T1 of the washer 5, the shaft length H2 of the rotary bearing 1, the support shaft 4 from the upper end of the post 3,
It is required that each of the dimensions such as the height dimension H1 be high precision and appropriate dimensions.

However, since it is very difficult to determine all the dimensions of the above parts with high precision and appropriateness,
There have been many difficulties in satisfying the running stability of the tape by making the size of the thrust play of the rotary bearing 1 appropriate.

The present invention has been made under the above circumstances, and has a depth D of the hole 21 of the cap 2 and a washer 5.
Thickness T1, shaft length H2 of rotary bearing 1, post 3
Regardless of the accuracy of the height dimension H1
It is an object of the present invention to provide a method for assembling a pinch roller of a recording / reproducing apparatus which can appropriately and easily determine the pinch roller.

Another object of the present invention is to provide a jig for assembling a pinch roller of a recording / reproducing apparatus which can be suitably used when such an assembling method is adopted.

[0011]

According to the present invention, there is provided a method for assembling a pinch roller of a recording / reproducing apparatus, comprising: a support shaft, a rotary bearing fitted to the support shaft, and a hole formed in the support shaft. A cap attached to the support shaft by press-fitting and having a lower end face opposed to the upper end face of the rotary bearing with a gap therebetween, and the pressing roller for pressing the tape against the tape feed capstan is The present invention can be suitably applied to a recording / reproducing device attached to a rotary bearing.

[0012] In the assembling method according to the present invention, the hole of the cap is inserted into the jig to which the cap is attached until the tip of the projection projecting from the lower end face of the cap hits the upper end face of the rotary bearing. A procedure of press-fitting the support shaft is adopted. According to this method, the above-mentioned gap size is determined unitarily by the width of the projection provided on the jig from the lower end surface of the cap. Therefore, the size of the thrust play of the rotary bearing can be determined with high accuracy only by making the protrusion width dimension of the projection match the desired gap dimension.

In the assembling method according to the present invention, the jig includes:
It has a function of holding the cap so that it can be displaced in the axial direction, and a receiving surface that receives the cap when press-fitting the hole of the cap to the support shaft and regulates the retreat position of the cap with respect to the jig in the axial direction. Alternatively, after the receiving surface receives the cap, it is possible to adopt a procedure in which the cap is pressed by the receiving surface to press-fit the hole of the cap into the support shaft. According to this method, at an initial stage in which the hole of the cap held by the jig is pressed into the support shaft, the cap retreats with respect to the jig, and the cap is received on the receiving surface on the jig side. Therefore, it is only necessary to hold the cap on the jig at the beginning of press-fitting. In the press-fitting operation after the cap is received on the receiving surface on the jig side, the receiving surface presses the cap, and the hole of the cap is pressed into the support shaft.

When this method is adopted, the width of the projection from the lower end face of the cap when the receiving surface receives the cap and the retracted position of the cap is regulated corresponds to the gap. It is necessary to be set to the dimensions, and in such a case, the gap size described above is unitarily determined by the width of the projection provided on the jig from the lower end surface of the cap, The size of the thrust play of the rotary bearing is determined with high precision.

A jig for assembling a pinch roller of a recording / reproducing apparatus according to the present invention is provided by press-fitting a support shaft, a rotary bearing fitted to the support shaft, and a hole into the support shaft. A cap attached to the support shaft and having a lower end face opposed to the upper end face of the rotary bearing with a gap therebetween, and a pressing roller for pressing the tape against the tape feed capstan is attached to the rotary bearing. It can be suitably used when assembling a pinch roller of a recording / reproducing apparatus.

The jig has a cylindrical cap holding portion into which the cap can be axially displaceably fitted, and a flange formed at a lower end surface of the cap holding portion and provided at a lower end portion of the cap. A receiving surface that is in contact with an upper end surface of the cap, and a projection that extends from the cap holding portion and protrudes below the flange when the upper end surface of the flange is in contact with the receiving surface. In addition, the tip of the projection is formed as a contact portion that abuts against the upper end surface of the rotary bearing when the hole of the cap is press-fitted into the support shaft and regulates the press-fitting of the hole into the support shaft. Have been.

According to this jig, the gap size described above is
It is determined unitarily by the width of the protrusion of the projection projecting below the flange of the cap from the flange. Therefore, it is possible to determine the size of the thrust play of the rotary bearing with high accuracy only by making the protrusion width dimension of the projection coincide with the desired gap dimension.

The jig of the present invention can be used for a cap in which the lower end surface of the cap and the lower end surface of the flange portion of the cap are at the same level. 6 and the like.

In the jig according to the present invention, the protrusion is projected from the receiving surface as a starting point, and the protrusion is inserted into a mouth provided in a state penetrating the flange in a thickness direction. It is desirable to be able to. With this configuration, the jig can be used even when the diameter of the rotary bearing is not larger than that of the flange of the cap.

In the jig according to the present invention, the protrusion width of the protrusion from the receiving surface must be set to a size obtained by combining the thickness of the flange and the size corresponding to the gap. There is.

According to the jig of each of the above-mentioned inventions, the above-described assembling method according to the present invention can be performed very easily.

[0022]

FIG. 1 is a sectional view of a main part of a pinch roller for explaining an assembling method according to the present invention, FIG. 2 is a plan view of a cap 2, and FIG. FIG. 4 is a schematic perspective view of the jig 6.

The cap 2 shown in FIGS. 2 and 3 has the cylindrical portion 23 and the flange portion 22 integrally, and has the flange portion 22 and the cylindrical portion 23 at three positions at equal circumferential intervals. And the cylindrical portion 2 is integrally provided.
3 and the lower end surface 26 of the flange 22 are at the same level. In addition, 3 at every circumferential angle of the flange 22
A notch-shaped mouth portion 22a is formed in a location penetrating in the thickness direction. The hole 21 of the cap 2 is formed as shown in FIGS.
Is slightly deeper than that of the conventional cap 2 described in (1). On the other hand, the height of the support shaft 4 from the upper end of the post 3 shown in FIG. 1 is the same as that shown in FIG. Therefore, the inner wall surface 27 of the hole 21 of the cap 2 is brought into contact with the top surface 41 of the support shaft 4 so that the clearance A
Cannot be properly determined. It is not necessary to determine the depth dimension of the hole 21 with high accuracy.

In the jig 6 shown in FIG. 4, the lower end surface of the cylindrical cap holding portion 61 is formed on the receiving surface 62, and the projection 63 projects from the receiving surface 62 as a starting point.
3 is formed as an end 64. Since the abutting portion 64 in the illustrated example is a flat surface, the abutting portion 64 exerts a large force on the upper end surface 12 of the rotary bearing 1 as described later.
It does not collapse when pressed against. The cap holding portion 61 is provided with a slit-like cut 65 extending from the lower end in the axial direction. Then, the cylindrical portion 23 of the cap 2 shown in FIGS.
When the cap 2 is inserted, the cap 2 is held in the cap holding portion 61 so as to be movable in the axial direction, and the receiving surface 6
2 faces the upper end surface of the flange 22 on the cap 2 side. When the bracket 24 of the cap 2 is fitted into the notch 65 of the jig 6 and the upper surface 28 of the flange 22 of the cap 2 is received on the receiving surface 62, the jig 6 is received.
The protrusion 64 on the side protrudes below the flange 22 through the mouth 22 a of the flange 22. The width L of the protrusion 64 protruding from the receiving surface 62 is determined to be a combination of the thickness B of the flange 22 of the cap 2 and the appropriate gap A (see FIG. 1). .

Next, a method of assembling the pinch roller using the jig 6 described with reference to FIG. 6 will be described.

As shown in FIG. 1, the lower end 4a of the support shaft 4 is press-fitted into a hole 31 of a post 3 protruding from a frame member such as a chassis (not shown).
Are fixed to the post 3. Further, the washer 5 and the rotary bearing 1 are fitted to the support shaft 4 in this order. The rotary bearing 1 is slidably rotatable with respect to the support shaft 4.

On the other hand, the jig 6 holds the cap 2.
When the jig 6 holds the cap 2, as described above, the cylindrical portion 23 of the cap 2 is inserted into the cap holding portion 61, and the receiving surface 62 becomes the upper end surface 2 of the flange 22 on the cap 2 side.
8 and the bracket 24 on the cap 2 side with the jig 6
The projection 64 on the jig 6 is inserted through the opening 22 a of the flange 22.

Then, after the opening edge of the hole 21 of the cap 2 is opposed to the top of the support shaft 4, the jig 6 is pushed down as shown by the arrow F in FIG. In this case, since the cap 2 retreats with respect to the jig 6 at the initial stage of the press-fitting, the upper end surface 28 of the flange 22 of the cap 2 is received by the receiving surface 62 of the jig 6. When the jig 6 is further pushed down as shown by the arrow F in FIG. 1 at this stage, the receiving surface 62 presses the cap 2 via the upper end surface 28 of the flange 22 of the cap 2. The hole 21 of the cap 2 is pressed into the support shaft 4. When this press-fitting operation is performed until the tip of the protrusion 63 on the jig 6 side, that is, the abutting portion 64 abuts on the upper end surface 12 of the rotary bearing 1, the same width as the protrusion width of the protrusion 63 protruding below the flange portion 22 is obtained. The lower end surface 25 of the flange portion 22 and the upper end surface 12 of the rotary bearing 1 face each other at a certain distance. Here, since the protrusion width dimension of the projection 63 is the same as the appropriate gap dimension A, the gap dimension A is determined with high accuracy, and a thrust having an appropriate size is obtained. In addition,
After attaching the cap 2 to the support shaft 4, the pressing roller 10 (see FIG. 5) is attached to the rotary bearing 1.

According to this embodiment, the projection 6 on the jig 6 side
3 is a mouth 22a provided on the flange 22 of the cap 2.
Therefore, even if the diameter of the rotary bearing 1 is not larger than the diameter of the flange portion 22 of the cap 2, the above-described assembling method can be adopted.

[0030]

As described above, according to the assembling method of the present invention, the depth of the hole of the cap, the thickness of the washer,
The gap size between the lower end surface of the cap (the lower end surface of the flange) and the upper end surface of the rotary bearing can be determined with high accuracy regardless of the dimensional accuracy of other parts such as the shaft length of the rotary bearing and the height of the post. It can be determined appropriately and easily. Also,
According to the jig of the present invention, the above assembling method can be easily performed.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a pinch roller for explaining an assembling method according to the present invention.

FIG. 2 is a plan view of a cap.

FIG. 3 is a sectional view taken along the line III-III in FIG. 2;

FIG. 4 is a schematic perspective view of a jig.

FIG. 5 is a cross-sectional view of a main part of a pinch roller employing a rotary bearing.

FIG. 6 is a perspective view of a cap used for a pinch roller.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotation bearing 2 Cap 4 Support shaft 6 Jig 10 Press roller 12 Upper end face of rotation bearing 21 Hole 22a Mouth 23 Cylindrical part 25 Lower end face of cylindrical part (lower end face of cap) 26 Lower end face of flange part (of cap) (Lower end surface) 61 Cap holding portion 62 Receiving surface 63 Projection 64 Abutting portion A Gap size (dimension corresponding to the gap) L Outer width size B Thickness size of flange S S Gap

Claims (7)

[Claims] 1. A support shaft, a rotary bearing fitted to the support shaft in a fitted state, and a hole portion fitted to the support shaft by press-fitting the hole into the support shaft so that a lower end surface is above the rotary bearing. A method for assembling a pinch roller of a recording / reproducing apparatus, comprising: a cap facing an end face with a gap therebetween; and a pressing roller for pressing a tape against a tape feed capstan attached to the rotary bearing. The hole of the cap is press-fitted to the support shaft until the tip of the projection provided on the jig provided with the cap and projecting from the lower end face of the cap hits the upper end face of the rotary bearing. A method for assembling a pinch roller of a recording / reproducing apparatus. 2. A function of holding the cap in the jig so as to be displaceable in the axial direction, and receiving the cap when the hole of the cap is press-fitted to the support shaft, and the cap being retracted with respect to the jig in the axial direction. And a receiving surface that regulates
2. The method according to claim 1, wherein after the receiving surface receives the cap, the cap is pressed by the receiving surface to press-fit the hole of the cap into the support shaft. 3. The protrusion width from the lower end face of the cap when the receiving surface receives the cap and the retreat position of the cap is regulated is set to a dimension corresponding to the gap. Item 3. An assembling method of the pinch roller of the recording / reproducing apparatus according to Item 2. 4. A support shaft, a rotary bearing fitted to the support shaft in a fitted state, and a hole portion fitted to the support shaft by press-fitting the hole into the support shaft so that a lower end surface is above the rotary bearing. A jig for assembling a pinch roller of a recording / reproducing apparatus, comprising: a cap facing an end face with a gap therebetween; and a pressing roller for pressing a tape against a tape feed capstan attached to the rotary bearing. A cylindrical cap holding portion into which the cap can be axially displaceably fitted, and abutting against an upper end surface of a flange formed at the lower end portion of the cap and formed by the lower end surface of the cap holding portion; And a projection extending from the cap holding portion and projecting below the flange when the upper end surface of the flange is in contact with the reception surface. Of the cap supports the hole of the cap. A pinch roller for a recording / reproducing apparatus, which is formed as a butting portion which comes into contact with an upper end surface of the rotary bearing when press-fitted into the shaft to restrict a press-fitting of the hole into the support shaft. Utensils. 5. The pinch of a recording / reproducing apparatus according to claim 4, wherein the cap has a cylindrical portion and the flange, and has a lower end surface of the cylindrical portion and a lower end surface of the flange at the same level. Roller assembly jig. 6. The projection is projected from the receiving surface as a starting point, and the projection is inserted into an opening provided in the flange so as to penetrate in the thickness direction. A jig for assembling a pinch roller of the recording / reproducing apparatus according to claim 4 or 5. 7. A projection width dimension of the projection from the receiving surface,
7. The jig for assembling a pinch roller of a recording / reproducing apparatus according to claim 6, wherein the dimension is determined by combining a thickness dimension of the flange portion and a dimension corresponding to the gap.