JPS63100656A - Magnetic tape guide device for magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify constitution and to facilitate assembly by burying, in a joining part between a table guide and a nut, a screw loosening preventive which prevents a screw from becoming loose to a prescribed rotation torque. CONSTITUTION:A cylindrical tape guide 5A is inserted into a journal 21A in a tape guide device erected in a chassis 2. The guide 5A and the not 10A are press fitted into press fit joining 5b and 10a, and all of them are integrally joined. The nut 10A is screwed in an external screw part 21a. Since a resin moldings 22 becoming the screw loosening preventive is buried in the screw part 21a, a screw is never loosened as long as a prescribed rotation torque is applied to it. The nut 10A is fine rotated to adjust the height of the integral guide 5A. Since the tape guide 5a and the nut 10A are integrally formed in such a way, the structure is simple and the assembly is significantly facilitated accordingly.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic tape guide device for a magnetic recording and reproducing device such as a video tape recorder, and particularly to a magnetic recording and reproducing device that has a simple structure and is easy to assemble. The present invention relates to a magnetic tape guide device of the device.

[Conventional technology]

A conventional magnetic tape guide device for a video tape recorder will be described.

FIG. 3 is an external perspective view showing an example of a tape running mechanism of a conventional video tape recorder, FIG. 4 is a plan view of a main part of the tape running mechanism according to FIG. 3, and FIG. a front view showing details of the magnetic tape guide device;
6 is an exploded perspective view of the magnetic tape guide device according to FIG. 5. FIG.

First, the outline of this tape running mechanism will be explained using FIG. 4.

In the figure, a magnetic tape 3 wound around a feed-out reel hub 7 and a take-up reel hub 8, which are housed in a tape cassette l, is pulled out by a tape drawer 11 and wound around a rotary head cylinder 4. , it is now possible to send and receive video signals magnetically. The magnetic tape 3 is guided by a magnetic tape guide device 12 (to be described in detail later), and its running height is regulated and the magnetic tape 3 can run either in the forward direction indicated by arrow A or in the reverse direction indicated by arrow B. It is configured to do so.

The details of the magnetic tape guide device bi12 will be explained using FIG. 5-6. A male threaded portion 21a is carved into the support shaft 21 that is set up on the chassis 2.

to this support shaft 21 via the compression spring body 9.''

A substantially cylindrical tape guide 5 having flanges 5a at both ends is attached, and the tape guide 5 is held against the elastic force of the compression spring 9 by a nut 10 having a female thread 10b. It is something that is forced in a direction.

According to the magnetic tape guide device 12 configured in this way. A method of regulating and guiding the running height of the magnetic tape 3 will be explained. a
Place the low tape on top of tape guide 5.

The nut 10 is slightly rotated while being positioned between the flanges 5a on both ends, and the nut 10 is slightly rotated while the running condition is monitored. The lower end 3a of the magnetic tape 3 in the tape width direction (sixth
This is done by finely adjusting the f6 height of the tape guide 5 so that the tape guides 5 (shown in the figure) are in contact with each other. This operation is essential for obtaining the optimum tape running condition jFA.

A related device of this type is, for example, a metal tape fixing post described in Japanese Utility Model Application Publication No. 57-164860.

[Problem that the invention seeks to solve]

The conventional magnetic tape guide device described above has a compression spring body 9.
Tape guide 5. Not only does this require three members such as the nut 10, but also three assembly stations are required when these three members are assembled using an automatic assembly machine. Nowadays, price competition for video tape recorders is fierce, and low-cost production is essential, and there is a strong need to reduce the number of nine parts required for assembly. Considering these circumstances, the structure of the conventional magnetic tape guide device is complicated, and no consideration has been given to assembly.

The present invention addresses the problems of the prior art described above and provides a magnetic tape guide device for a magnetic recording/reproducing device that is simple in structure and easy to assemble. .

[Means for solving problems]

The present invention is directed to solving the above problems. The structure of the magnetic tape guide device of a magnetic recording and reproducing device is such that a substantially cylindrical tape guide having a flange at least on the lower end side is inserted into a support shaft that is set up on a chassis and has a male threaded part, and the male threaded In a magnetic tape guide device of a magnetic recording/reproducing device, the height of the tape guide can be adjusted using a nut having a female threaded portion that is screwed into the tape guide, and the nut is integrated with the tape guide. The male threaded portion of the support shaft is coated with or embedded with a screw loosening agent that will not loosen until a predetermined rotational torque is applied to the nut.

More specifically, when the tape guide and the nut are joined together by a fastening means such as press-fitting, and the nut that is threadedly engaged with the male thread of the support shaft is rotated at the same time, the tape guide also moves up and down together with the nut. In this way, a resin molded product is embedded in the male threaded portion of the support shaft as a screw loosening preventive agent.

[Effect]

Since the tape guide and the nut are connected by fastening means such as press-fitting, when the nut is rotated and moved downward, the tape guide also moves up and down at the same time. In addition, since a thread-loosening agent is coated or embedded in the male threaded part of the support shaft that is screwed into the nut, even after adjusting the height of the tape guide by slightly rotating the nut, the threaded part of the support shaft that is screwed into the nut can be kept at the specified level. The rotational resistance torque can prevent the nut from loosening.

〔Example〕 The present invention will be explained below by way of examples.

FIG. 1 is a partial sectional view showing a magnetic tape guide device of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the magnetic tape guide device according to FIG. 1. In each figure, the same parts are denoted by the same numbers as in Fig. 5.6.

First, the outline of this magnetic tape guide device will be explained using the drawings.

This magnetic tape guide device fi12A is installed on the chassis 2, and is attached to a support shaft 21A having a male screw portion 21a carved therein.
A tape guide 5A having a substantially cylindrical shape having flanges 5a on both lower ends is inserted, and the crystalness of the tape guide 5A is adjusted using a nut IOA carved with a female thread 10b that screws into the male thread 21a. The tape guide 5A and the nut IOA are integrally connected, and the male threaded portion 21a of the support shaft 2LA is applied with a predetermined rotational torque to the nut IOA. This is a magnetic tape guide device in which a resin molded product 22 containing a screw loosening preventive agent is embedded.

This will be explained in detail below.

The tape guide 5A has flanges 5a on both upper and lower end sides,
A press-fit joint 5b is provided at the top, and since the magnetic tape 3 slides on the surface of the tape guide 5A, it is manufactured by lathe processing or the like using stainless steel.

The nut IOA has a hexagonal head and is provided with a press-fit joint 10a at the bottom that can be press-fitted inside the press-fit joint 5b of the tape guide 5A. It is manufactured at low cost using materials such as rolling and forging. These tape guides 5A and nuts LOA are connected to both press-fit joints 5b and l.
They are press-fitted together at the oa and joined together into one piece. A resin molded product 22 containing a screw loosening agent is embedded in the male threaded portion 21a of the support shaft 21A. This resin molded product 22
is, for example, nylon.

With this structure, the magnetic tape guide device 12A can be installed by simply inserting the tape guide 5A integrally connected to the nut IOA into the spindle 21A and screwing the nut 10A onto the male threaded portion 21a. Assembly is completed (this assembly can be performed with one automatic assembly machine)
The subsequent fine adjustment work for the height of the tape guide 5A may be performed in the same manner as in the prior art.

A specific example will be shown.

Male threaded part 21a of support shaft 21A (M3 thread = outer diameter 3mφ
), when the resin molded product 22 (nylon) is embedded in the
Until the return torque (1kg-am) is negative 4,
The tape guide 5A did not loosen. The magnitude of this rotational torque has enough margin for normally expected tape rotational torque, external torque due to vibration, etc., and the tape guide 5A will never loosen during use.

According to the embodiment described above, the tape guide 5A and the nut IOA are integrally connected, and by simply assembling only one part, the magnetic tape guide device i! l 2
Since the assembly of A can be completed, the structure is fWJt
This has the advantage that it is possible to provide a magnetic tape guide device for a magnetic recording/reproducing device that is extremely easy to assemble. For example, a conventional magnetic tape guide device requires three assembly machines when an automatic assembly machine is used for its assembly, whereas the present embodiment only requires one assembly machine. It brings significant economic benefits.

In addition, in this embodiment, the male threaded portion 2 of the support shaft 21A
Although a resin molded product 22 is embedded in 1a as a screw loosening preventive agent, the same effect can be obtained by spraying a resin such as nylon instead of the resin molded product 22.

Furthermore, in this embodiment, the flange 5a is provided on the upper and opposite end sides.
Although the magnetic tape guide device equipped with the tape guide 5A having
Needless to say, the present invention can be similarly applied to a tape guide equipped with a tape guide.

〔Effect of the invention〕

As explained in detail above, according to the present invention, the structure is WJ
It is possible to provide a magnetic tape guide device for a magnetic recording/reproducing device that is easy to assemble.

[Brief explanation of the drawing]

FIG. 1 is a partial sectional view showing a magnetic tape guide device of a magnetic recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the magnetic tape guide device according to FIG. 1, and FIG. The figure is an external perspective view showing an example of the tape running mechanism of a conventional video tape recorder, FIG. 4 is a plan view of the main part of the tape running mechanism according to FIG. 3, and FIG. FIG. 6, a front view showing details of the guide device, is an exploded perspective view of the magnetic tape guide device according to FIG. 5. 2...Chassis, 5A...Tape guide, 5a...
・Tsubabe. 5b...Press-fit joint, IOA...Nut, loa.
...Press-fit joint part, 10b...Female thread part, 12A...
Magnetic tape guide device, 21A... Support shaft, 21a...
・Male thread part, 22...Resin molded product.

Claims (1)

[Claims] 1. A substantially cylindrical tape guide having a flange at least on the lower end side was inserted into a support shaft that was set up on the chassis and had a male threaded part carved therein, and a female threaded part was carved into it to be screwed into the male threaded part. In a magnetic tape guide device of a magnetic recording and reproducing device, in which the height of the tape guide can be adjusted using a nut, the tape guide and the nut are integrally connected, and the male threaded portion of the support shaft is A magnetic tape guide device for a magnetic recording and reproducing device, characterized in that the nut is coated with or embedded with a screw loosening preventive agent that does not loosen until a predetermined rotational torque is applied to the nut.