JPS627622B2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Field of Application This invention relates to a video tape recorder (hereinafter referred to as
This invention relates to a vertical roller post of a tape guide means constituting a tape loading mechanism of a VTR (VTR).

Prior Art In the tape loading mechanism of a VTR, a pair of tape guide means including a vertical roller post and an inclined post are provided, and the tape is loaded and unloaded by moving along a guide groove formed in the chassis base. There is a format.

The vertical roller post constituting this tape guide means has conventionally been constructed as shown in FIG.

In FIG. 4, reference numeral 3 denotes a base support cylinder, which is formed into a hollow cylinder shape and is inserted through one end of the post base 2 along the top and bottom. The end projecting downward from the post base 2 is fitted into a guide groove 1a formed in the chassis base 1 so as to be slidable along the tape loading path. A positioning flange 3a that is locked onto the upper surface of the post base 2 is formed on the outer periphery of the intermediate portion of the support tube 3. A female thread 3b is provided on the inner periphery of the support tube 3 above the flange 3a. A roller shaft 4 is inserted into the center hole of the support tube 3.
The lower end of is inserted. A cylindrical intermediate member 5 is integrally press-fitted onto the outer periphery of the roller shaft 4 at a substantially intermediate portion thereof. The female screw 3 is attached to the outer periphery of the lower end of the intermediate member 5.
A male screw 5a is provided to be screwed into b.
Further, a flange portion 5b is formed at the upper end portion. The roller shaft 4 is supported by the support tube 3 by fitting the lower end into the center hole of the support tube 3 and then appropriately screwing the male screw 5a into the female screw 3b.

A roller 6 is rotatably fitted on the outer periphery of the roller shaft 4 above the flange portion 5b. roller 6
is positioned and held between the flange portion 5b of the intermediate member 5 and the flange 7 attached to the upper end of the roller shaft 4.

The roller shaft 4, intermediate member 5, roller 6, and flange 7 are assembled together in advance, and in this state, the lower end of the roller shaft 4 is first fitted into the center hole of the support cylinder 3. Next, the male screw 5a of the intermediate member 5 is screwed into the female screw 3b. At that time, if the screwing amount of the male screw 5a is adjusted appropriately, the chassis base 1
The height from the tape center to the roller 6 is adjusted up and down by the required amount. At that time, the roller shaft 4,
The roller assembly consisting of the intermediate member 5 and the roller 6 is
A rubber elastic body 8 attached to the lower part of the flange portion 5b on the outer periphery of the intermediate member 5 constantly urges the support cylinder 3 upwardly, and thereby the screws 3b, 5
The looseness caused by screwing a is absorbed.

After the roller assembly is supported by the support cylinder 3 as described above and its height is adjusted, the mounting screw 9 is screwed into the screw hole formed below the flange 3a of the support cylinder 3, and the roller shaft 4 is When the lower end is pressed against the circumferential surface of the center hole of the support tube 3, the roller assembly including the roller shaft 4 is fixed to the support tube 3, and the vertical roller post is integrally assembled.

Problems to be Solved by the Invention However, according to the conventional structure as described above, the roller shaft 4 is pressed against the inner circumferential surface of the center hole of the support tube 3 by the mounting screw 9 and fixed. If the mounting screw 9 is screwed into a portion where there is a large gap between the support tube 3 and the roller shaft 4, the necessary perpendicularity of the roller shaft 4 to the post base 2 cannot be obtained, resulting in misalignment. Therefore, the mounting screw 9 must be screwed into a position below the flange 3a of the support cylinder 3 and at a position spaced downward from the female thread 3b provided on the inner circumference thereof. Moreover, the mounting screw 9
In order to be able to perform screw-in operations without any trouble, the mounting screws 9 must be exposed above the base surface of the chassis base 1. Therefore, the intermediate member 5 attached to the support tube 3 and the roller shaft 4
The threaded member formed by the male thread 5a and the female thread 3b is always located above the screwing position of the mounting screw 9, and the threaded part is also located above the post base 2. . Therefore, an extra space in the height direction is created between the post base 2 and the roller 7 fitted to the roller shaft 4 due to the threaded portion of the male screw 5a and the female screw 3b.

Incidentally, research and development on VTRs with built-in cameras has recently been actively conducted, and progress has been made in making VTRs smaller, lighter, and thinner. Under such circumstances, it is considered important to reduce the height from the chassis base to the tape center as much as possible. This means that 2
In a 1/1 inch VTR, the cassette thickness is
It's not much of a problem since it's 25mm thick, but 8mm
This is especially important for VTRs, as the cassette is as thin as 15mm. Therefore, when developing the 8mm VTR, considerable effort and effort was required to make the VTR smaller and thinner, such as by reducing the height in 0.1mm increments. However, with the above configuration, it is not possible to reduce the height h from the chassis base 1 to the tape center of the vertical roller post due to the surplus space created above the post base, which poses major constraints on the equipment configuration. I will receive it. As a result, a problem arose in that it was not possible to make the VTR smaller, lighter, and thinner.

Means for Solving the Problems (Technical Problems) This invention was proposed to solve the above-mentioned conventional problems, and its purpose is to improve the height from the chassis base of the vertical roller post to the tape center. The goal is to reduce the amount of noise as much as possible, thereby making the VTR smaller, lighter, and thinner.

(Technical Means) In order to achieve the above-mentioned technical problem, the present invention includes a base support cylinder inserted through one end of the post base, and a base support cylinder whose lower end is inserted into the inner space of the support cylinder. A central shaft to be inserted, a mounting screw that is attached to the lower end of the central shaft and screwed into a mounting screw hole formed on the inner circumference of the lower part of the support cylinder, and a mounting screw that is attached to the upper part of the central shaft so as to be in contact with the magnetic tape. a roller post assembly consisting of a roller body and a hollow, approximately cylindrical intermediate body fitted above the mounting screw on the outer periphery of the central axis; The main component is a push screw that presses and fixes the shaft to the inner circumferential surface of the intermediate body, and the screwing part between the mounting screw and the mounting screw hole is located below the screwing position of the push screw. has been done.

Effects According to the above configuration, the screwing part between the mounting screw provided at the lower end of the central shaft and the mounting screw hole formed on the lower inner periphery of the support cylinder is inserted into the central shaft from the circumferential direction through the intermediate body. It is located below the screwing position of the set screw that is press-fixed to the body circumferential surface, and its threaded portion is lowered to near the central axis and the lower end of the support cylinder. Therefore, there is no surplus space above the screwing position of the set screw due to the above-mentioned threaded portion, and space is saved in the height direction. Therefore, the height H from the base surface of the chassis base constituting the VTR to the tape center of the vertical roller post can be reduced.

Embodiments Hereinafter, embodiments of the present invention will be described in detail based on the accompanying drawings.

FIGS. 1 and 2 show an embodiment of a vertical roller post according to the present invention.

In these figures, reference numeral 10 denotes a chassis base constituting the main body of the VTR, and a guide groove 11 is provided at a predetermined position on the chassis base for guiding tape guide means for loading and unloading the tape along the tape loading path. It's becoming like that.

Reference numeral 12 denotes a post base constituting the tape guide means, and a vertical roller post 20 is erected at one end of the post base (the outer end with respect to the rotating cylinder installed on the chassis base).

The vertical roller post 20 is constructed as follows.

A base support cylinder 21 is attached to one end of the post base 12.
is penetrated in the vertical direction. The support cylindrical body 21 is formed into a hollow cylindrical shape that opens upward and downward, and its end projecting downward from the post base 12 is fitted into the guide groove 11 of the chassis base 10 so as to be slidable along the loading path. . Support cylinder 21
A flange portion 21a that is engaged with the upper surface of the post base 12 is formed on the outer periphery of the upper end. A mounting screw hole 21b and a receiving hole 21c having a larger diameter than the mounting screw hole 21b are formed in a stepped manner at the lower and upper inner circumference of the support cylinder 21. An insertion hole 21d for a push screw 31, which will be described later, is formed at a predetermined position on the upper outer peripheral surface of the support cylinder 21 so as to penetrate through the receiving hole 21c. Mounting screw hole 2
1b is located at the chassis base 10 when the support cylinder 21 is inserted into the guide groove 11.

A roller post assembly 22 is vertically attached to and supported by the support cylinder 21.

The roller post assembly 22 is constructed as shown in FIG. 3 and is integrally assembled with the support cylinder 21.
be assembled into. A lower flange 24 is press-fitted onto the outer periphery of an axially intermediate portion of the central shaft 23 . Further, an upper flange 25 is fitted to the upper end portion. A roller body 27 that contacts the tape is rotatably fitted between a lower flange 24 and an upper flange 25 on the outer periphery of the central shaft 23. Roller body 2
The lower end portion of the lower flange 7 is externally fitted onto a boss portion formed on the upper surface of the lower flange 24 with some play.

A mounting screw 28, which is screwed into the mounting screw hole 21b of the support cylinder 21, is integrally fitted to the outer periphery of the lower end of the central shaft 23. Moreover, a hollow, substantially cylindrical intermediate body 29 is fitted and fixed on the upper outer periphery thereof.
A screw hole 29a corresponding to the insertion hole 21d is provided at a predetermined position on the circumferential surface of the intermediate body 29. Furthermore,
Lower flange 24 on the outer periphery of the central shaft 23 and the intermediate body 2
9, an annular elastic body 30 made of rubber or the like is interposed. The lower part of the elastic body 30 is the intermediate body 29
It is fitted into a boss portion 29b formed on the upper surface of. The outer diameter of the elastic body 30 is made larger than that of the intermediate body 29 in order to increase its thickness, and when the roller post assembly 22 is assembled to the support cylinder 21, it is placed on the upper surface thereof. It's becoming like that.

An alignment notch 21e and a protrusion 29c are provided at the upper end of the support cylinder 21 on the opposite side to the insertion hole 21d and on the upper outer periphery of the intermediate body 29 on the opposite side from the screw hole 29a. are formed respectively. By this engagement, the insertion hole 21d and the screw hole 29a are aligned.

Note that the intermediate body 29 described above is formed of, for example, resin.

In assembling the vertical roller post configured as described above, first, the support cylinder 21 is inserted into one end of the post base 12 from above, and the flange portion 21a is locked to the top surface of the post base. Insert until the end. The support cylinder 21 is now attached to the post base 12 and slidably fitted into the guide groove 11. Next, the lower end side of the central shaft 23 of the roller post assembly 22 assembled integrally as described above is attached to the support cylinder 2 with the mounting screw 28.
1 and insert the mounting screw 28 into the mounting screw hole 2.
1b, the intermediate body 29 is press-fitted into the receiving hole 21c of the support cylinder 21 while keeping the distance between the lower flange portion 24 and the intermediate body 29 constant using an adjustment jig. At this time, the recess 21e and the protrusion 29b
An insertion hole 21d formed in the support cylinder 21 and a screw hole 29a formed in the intermediate body 29 by positioning engagement with the
are aligned. When the mounting screw 28 has been screwed in to a certain level, the height of the entire roller post assembly 22 can be adjusted vertically by adjusting the screwing amount by the required amount up and down. Accordingly, an adjustment is made to regulate the height from the base surface of the tape that comes into contact with and is wound around the roller body 27. At this time, the elastic body 30 is pressed between the upper surface of the support cylinder 21 and the lower flange 24, and the entire roller post assembly 22 is pushed against the lower flange 24 by the elastic force.
4, it is constantly pushed upwardly. This absorbs the play caused by the screw engagement between the mounting screw 28 and the mounting screw hole 21b.

When the height of the roller post assembly 22 from the base surface is adjusted, that is, the tape height is adjusted by turning the mounting screw 28, the set screw 31 is inserted through the insertion hole 21d of the support cylinder 21 into the intermediate position. It is screwed into the screw hole 29a of the body 29. Then, the center axis 23 of the roller post assembly 22 is aligned with the intermediate body 29.
is pressed against the inner circumferential surface of and fixed. In that case,
The center shaft 23 is supported around the entire circumference by the inner peripheral surface of the intermediate body 29, and this part is pressed by a set screw 31, so that the pressing force prevents the perpendicularity to the post base 12 from going out of order or changing. will not occur. That is, the perpendicularity of the vertical roller post to the post base 12 is maintained with high precision.
The vertical roller post is thus assembled and attached to the post base 12. Thereafter, the end of the support cylinder 21 projecting downward from the post base 12 is slidably fitted into the guide groove 11 of the chassis base 10.

According to the structure of this embodiment described above, the set screw 31
Since the screwing position is higher than the screwing part between the mounting screw 28 and the mounting screw hole 21b, and the screwing part is lowered to approximately the same height as the chassis base 10, the push that conventionally occurs can be avoided. It is possible to eliminate the surplus space due to the threaded portion above the screwing position of the screw. Therefore, the height H from the chassis base 10 to the tape center can be reduced by at least that amount.

Effects of the Invention As explained in detail above, according to the vertical roller post according to the present invention, the threaded portion between the mounting screw hole provided in the support cylinder and the mounting screw provided at the lower end of the center axis Since it is located below the push screw to be pressed and fixed, and its threaded portion is lowered to the position of the chassis base, there is no surplus space due to the threaded portion that conventionally occurred above the threaded position of the push screw. Therefore, the height from the chassis base to the tape center of the vertical roller post can be reduced by at least that amount. As a result, we were able to
It is possible to easily make VTRs, especially 8mm VTRs, smaller, lighter, and thinner.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the assembled vertical roller post according to the present invention, FIG. 2 is an exploded perspective view thereof, FIG. 3 is a cross-sectional view of the roller post assembly according to the present invention, and FIG. FIG. 3 is a cross-sectional view showing a vertical roller post. 12...Post base, 21...Support cylinder, 2
3...Central axis, 21b...Mounting screw hole, 28...
Mounting screw, 27...Roller body, 29...Intermediate body,
22...Roller post assembly, 31...Push screw.

Claims (1)

[Claims] 1. A hollow base support cylinder inserted into one end of the post base, a central shaft whose lower end side is inserted into the inner space of the support cylinder, and the support cylinder attached to the lower end of the central shaft. a mounting screw screwed into a mounting screw hole formed on the inner periphery of the lower part; a roller body mounted on the upper part of the central shaft so as to be in contact with the magnetic tape; and a roller body fitted above the mounting screw on the outer periphery of the central shaft. A roller post assembly consisting of a hollow substantially cylindrical intermediate body, and a push screw that is screwed into the intermediate body through the circumferential surface of the support cylinder to press and fix the central shaft to the inner circumferential surface of the intermediate body. A vertical roller post, characterized in that a threaded portion between the mounting screw and the mounting screw hole is located below the push screw.