JPH0713065Y2 - Capstan shaft bearing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a bearing for a capstan shaft that runs a magnetic tape such as a video tape recorder (VTR).

[Outline of the Invention] The bearing of the capstan shaft of the present invention has a support shaft portion for supporting the capstan shaft at both ends of the connecting portion, and one mounting portion connected so as to project from the connecting portion on the chassis. By mounting the capstan shaft on the capstan shaft, the capstan shaft can be supported with high vertical accuracy even when the pinch roller is pressed against the capstan shaft.

[Conventional technology]

The capstan shaft of a VTR or the like is a factor that determines the running magnetic tape tilt, azimuth, etc., so that the capstan shaft is supported by the chassis with good vertical accuracy even when the pinch roller is pressed against the capstan shaft. It is necessary.

FIG. 4 is a perspective view showing a bearing for supporting such a conventional capstan shaft. Reference numeral 11 denotes a bearing formed by aluminum die casting or zinc die casting, and a connecting portion 12 and this connecting portion 12 are shown.
Support shafts 13U and 13D provided at both ends of the
And a mounting portion 15 provided below the.
A recess 14U into which a capstan shaft described later is inserted is formed in the support shaft portion 13U, and a hole 14D through which the capstan shaft passes is formed in the support shaft portion 13D.

The connecting portion 12 has a function of supporting the support shaft portions 13U and 13D such that the centers of the recesses 14U and the holes 14D are linear. Therefore, after the bearing 11 is formed, the recess 14U and the hole 14D are accurately formed by post-processing so that the centers of the recess 14U and the hole 14D coincide with each other.

Reference numeral 21 denotes a chassis formed by aluminum die-casting or zinc die-casting like the bearing 11, and the bearing 11 has a mounting portion 15
It is attached to the chassis 21 with a screw 22 that is inserted through.

Reference numeral 23 denotes a motor to which the chassis 21 is attached, and the shaft of this motor 23 becomes a capstan shaft 24. That is, the shaft of the motor 23 is passed through the hole 14D of the support shaft portion 13D and engaged with and supported by the recess 14U of the support shaft portion 13U to form the capstan shaft 24.

25 is a pinch roller that comes in contact with and separates from the capstan shaft 24;
Indicates a magnetic tape.

The capstan shaft 24 supported by the bearing 11 as described above is
When the pinch roller 25 is pressed against the capstan shaft 24 via the magnetic tape 26 while the motor 23 is activated and rotating, the magnetic tape 26 located between the capstan shaft 24 and the pinch roller 25 is removed. The magnetic tape 26 is fed at a constant speed in the direction of arrow A, and the magnetic tape 26 is wound up by a tape winding mechanism (not shown).

[Problems to be solved by the invention]

When the magnetic tape 26 is run as described above, since the pinch roller 25 is pressed against the capstan shaft 24, the support shaft portions 13U and 13D of the bearing 11 that supports the capstan shaft 24 are respectively in the direction of arrow B. Power acts. At this time, since the bearing 11 is supported in a cantilevered state in which the bearing 11 is attached to the chassis 21 at the lower side, a bending moment in the arrow C direction about the attachment portion 15 acts on the coupling portion 12, The connecting portion 12 is bent in the arrow C direction.

Therefore, the capstan shaft 24 supported by the bearing 11
The axial hanging accuracy of the magnetic tape 26 changes from when the capstan shaft 24 is attached, and the tape path of the magnetic tape 26 changes.

Therefore, a material with high rigidity so that the connecting portion 12 does not bend,
Further, the connecting portion 12 may be formed thick by die casting or the like, but since the bearing 11 becomes large and the accuracy as the bearing housing of the capstan shaft 24 cannot be obtained by die casting, cutting is performed after the forming. Therefore, there is a problem that it is necessary to obtain accuracy and increase cost.

This invention provides a bearing for a capstan shaft that solves the above problems.

[Means for solving problems]

The bearing of the capstan shaft of the present invention is configured such that support shaft portions are provided above and below the coupling portion, and the support shaft portions are mounted on the chassis by a pair of mounting portions protruding in different directions.

[Action]

Since the bearing of the capstan shaft of this invention is mounted on the chassis by the mounting portions provided above and below, even when the pinch roller is pressed against the capstan shaft supported by the bearing,
The upper and lower mounting portions can cope with the pressure contact force of the pinch roller, and the bending of the coupling portion of the bearing does not occur.

Further, since the mounting portions are installed in different directions, they can be easily mounted on the chassis with screws or the like.

〔Example〕

FIG. 1 is a perspective view showing a bearing of a capstan shaft according to an embodiment of the present invention, and FIG. 2 is a plan view of the bearing of the capstan shaft of FIG.

In these drawings, reference numeral 1 denotes a bearing molded by a synthetic resin, for example, polycarbonate, and a connecting portion 2 and supporting shaft portions 3U and 3D provided at both ends of the connecting portion 2,
A pair of mounting portions 5U, 5D protruding in different directions from the support shaft portions 3U, 3D at both ends of the connecting portion 2 are integrally formed. Then, the support shaft portion 3U has a recess 4U into which the capstan shaft is inserted, and the support shaft portion 3D has a hole 4D through which the capstan shaft passes.
Are formed.

The connecting portion 2 has a function of supporting the support shaft portions 3U, 3D so that the centers of the recesses 4U, holes 4D are linear.

FIG. 3 shows a perspective view of the bearing 1 attached to the chassis,
The same reference numerals as those in FIG. 4 indicate the same parts.

In FIG. 3, reference numeral 31 denotes a chassis molded by aluminum die casting or zinc die casting.

Since the bearing 11 of the present invention has the structure as described above, the mounting portion 5D is mounted on the chassis 31 by the screw 22 and the mounting portion 5U is a hill on the chassis as shown in FIG. When attached to the fixed base 31A, even when the pinch roller 25 is pressed against the capstan shaft 24 and the magnetic tape 26 is run as described above, the force of the pinch roller 25 pressed against the capstan shaft 24 is the support shaft portion 3U, 3D to mounting part 5U, 5D
And is received by the chassis 31.

Therefore, the bending moment does not act on the connecting portion 2, the axial hanging accuracy of the state where the capstan shaft 24 is attached to the chassis 31 is maintained, and the tape path of the magnetic tape 26 sent in the arrow A direction by the capstan shaft 24. Will not go mad.

When the bearing 1 is molded from synthetic resin as described above, the support shaft 3
Since the recesses 4U and the holes 4D of the U and 3D can be formed by aligning the centers at the time of forming, post-processing is not necessary and the bearing 1 can be manufactured at low cost.

Although the bearing 11 is made of synthetic resin in the above-mentioned embodiments, it goes without saying that it may be made of aluminum die casting or zinc die casting as in the conventional case.

[Effect of device]

As described above, in the capstan shaft bearing of the present invention, the support shaft portions are provided above and below the connecting portion, and the capstan shaft is mounted on the chassis by the pair of mounting portions protruding in different directions from the support shaft portion. Since it is configured to support, the force of the pinch rollers that press against the capstan shaft supported by the support shaft can be received by the upper and lower mounting parts, the connecting part of the bearing does not bend, and the axial hanging accuracy of the capstan shaft is Axial accuracy when attached can be maintained.

Therefore, there is an advantage that the tape path of the magnetic tape sent by the capstan shaft becomes constant. Further, since the mounting portions project in different directions, there is an advantage that the mounting work can be facilitated when fixing the bearing on the chassis.

[Brief description of drawings]

FIG. 1 is a perspective view showing a bearing of a capstan shaft according to an embodiment of the present invention, FIG. 2 is a plan view of the bearing of the capstan shaft of FIG. 1, and FIG. 3 is a chassis of the bearing of the capstan shaft. FIG. 4 is a perspective view showing a conventional capstan shaft bearing. In the figure, 1 is a bearing, 2 is a connecting portion, 3U and 3D are support shaft portions, 5U and 5D are mounting portions, 24 is a capstan shaft, and 31 is a chassis.

Claims (1)

[Scope of utility model registration request] 1. A connecting portion (2) formed on both ends of a support shaft portion (3U, 3D) arranged outside the capstan shaft and supporting two points of the capstan shaft, and a connecting portion (2) different from the support shaft portion. And a pair of mounting portions (5U, 5D) protruding in a direction and connected to each other, one of the pair of mounting portions is fixed to the chassis, and the other mounting portion is fixed to a fixing base protruding from the chassis. A bearing for a capstan shaft, which is characterized in that