JPH01189059A - Tape guide body for magnetic recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a video tape recorder (hereinafter referred to as VTR).
The present invention relates to a tape guide for a magnetic recording and reproducing device that regulates and guides the running height of a magnetic tape in such a magnetic recording and reproducing device.

[Conventional technology]

The structure of the magnetic tape guide of a conventional VTR will be explained with reference to FIGS. 3 to 6. Fig. 5 is a plan view of the main part of the tape running mechanism of a VTR, Fig. 4 is an external perspective view of the tape running mechanism of the VTR, Fig. 5 is a front view showing the installation state of the magnetic tape guide, and Fig. 6 is FIG. 3 is an exploded perspective view of the magnetic tape guide.

In FIG. 3, a magnetic tape 4 wound around a feed-out reel hub 2 and a take-up reel hub 3, which are self-selected to a tape cassette 1, is wound around a rotary head cylinder 6 by a tape drawer 5. It is a well-known technology that the device is configured to magnetically transmit and receive video signals.

The appearance of a VTR mechanism with such a function is shown in the fourth section.
Shown in the figure.

As shown in FIG. 5, the magnetic tape 4 is configured to run both in the forward direction indicated by the arrow A and in the reverse direction indicated by the B arrow. The tape guide 7 shown in FIG. 7 regulates and guides the running height.

Details of this tape guide 7 are shown in FIGS. 5 and 6.

In FIGS. 5 and 6, a support shaft 9 is mounted on the chassis 8, and a male threaded portion 9a is carved at the tip thereof. A cylindrical tape guide 7 having flanges 7a at both ends is attached to the support shaft 9 via a compression spring 10, and the tape guide 7 is attached to the compression spring 1o using a nut 11 having a female thread. The structure is such that it is pressed toward the chassis 8 against the elastic force.

Next, a method of regulating and guiding the running height of the magnetic tape 5 will be explained.

In FIG. 5, the magnetic tape 4 is positioned between the flanges 7a on both sides of the tape guide 7 and is run, and the nut 11 is slightly rotated while monitoring the running condition to allow the magnetic tape 4 to run on the flanges 7a of the tape guide 7 on the chassis 8 side. This is done by finely adjusting the height of the tape guide 7 so that the lower end 4a of the magnetic tape 4 in the tape width direction comes into contact with the end surface (above Bp in FIG. 5). This operation is essential and important in order to obtain optimal tape running conditions.

Incidentally, related devices of this type include, for example, the device described in Japanese Utility Model Application Laid-Open No. 57-1648750.

[Problem to be solved by the invention]

However, the above-mentioned conventional magnetic tape guide requires three members: the compression spring 10, the tape guide 7, and the nut 11, and furthermore, when assembling these three parts with an automatic assembly machine, three parts are required. Requires assembly of stationary run. These days V
Due to intense TR price competition, it is essential to produce VTRs at low cost, and there is a strong demand for semi-assembly and reduction of parts. Considering these circumstances, conventional magnetic tape guides are complicated and require many assembly stages.
However, there was a problem in that it required a large amount of equipment and was an obstacle to cost reduction.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a tape guide for a magnetic recording/reproducing device that solves these problems and has a simple structure, easy assembly, and cost reduction.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a magnetic tape guide that has flanges at both ends and regulates and guides the running height of a magnetic tape. This member is integrally coupled with a second member having a flange on the other end side and having a female thread.

[Effect]

Since a first member having a generally cylindrical shape having a flange at one end and a second member having a flange at the other end and having a female thread are integrally connected, an integrated member is formed. By assembling the tape guide, it becomes possible to complete the assembly of the tape guide. Further, when the second member is rotated, the first member is also rotated and moved up and down, so that the height can be adjusted.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the tape guide of the magnetic recording and reproducing apparatus according to the present invention, and is a partially cutaway front view of the attached state, in which 20 is the tape guide, 21 is the first member, and 21a is the collar. 22 is a second member, 22a is a flange portion, and 22b is a female screw portion. Portions corresponding to those in FIG. 5 are given the same reference numerals.

FIG. 2 is an exploded perspective view of a tape guide of a magnetic recording/reproducing apparatus according to the present invention, and parts corresponding to those in FIG. 1 are given the same reference numerals.

In these figures, the tape guide 20, which is a tape guide, has a first cylindrical shape having a flange 21a at one end.
The member 21 has a flange portion 22a on the other end side and a female screw portion 22.
The second member 22 provided with b is press-fitted into an integral structure.

Generally, tape guides are manufactured from stainless steel by lathe processing or the like. However, stainless steel is very hard, and if the second member 22 provided with the female threaded portion 22b is made of stainless steel, it is very difficult to process the female threaded portion 22b. Therefore, in the tape guide 20 of the present invention, the first member 21 is made of stainless steel material by lathe processing, etc.
Since the second member 22 has a female threaded portion 22b, it is easy to process and is made of non-magnetic material such as an aluminum alloy. Furthermore, since the second member 22 is made of an aluminum alloy that is easy to process, it is produced by a manufacturing method such as rolling or forging that can be produced at low cost. The configuration of the tape guide 20 processed in this manner is the lowest cost combination. In addition, the tape guide 2 is made of soft aluminum alloy.
It has been confirmed through experiments that even when used for the flange 21a of No. 0, the performance equivalent to that of stainless steel material can be achieved by alumite treatment or the like.

On the other hand, a male threaded portion 9a is provided at the upper part of the support shaft 9 which is erected on the chassis 8, and a screw loosening preventive agent 23 is applied to this male threaded portion 9a. As the screw loosening preventive agent 25, there is a method such as spraying a resin.

The installation of the tape guide 20 described above is completed by inserting it into the support shaft 9 and screwing the female threaded portion 22b of the second member 22 into the male threaded portion 9a. The adjustment method is as follows: The magnetic tape 4 is attached to the flanges 21a, 2 at both ends of the tape guide 2o.
2a, run the tape guide 2o, and rotate the tape guide 2o slightly while monitoring the running condition.
This is done by finely adjusting the height of the tape guide 20 so that the lower end 4a of the magnetic tape 4 in the tape width direction comes into contact with the end of the flange 21a on the chassis 8 side of the magnetic tape 4 (on line B in FIG. 1). .

In the embodiment described above, since the first part 21 and the second part 22 are integrally connected, the note tape guide 20 can be assembled by essentially assembling one part. If it is possible to complete the process, it can be handled with extremely simple work and can bring significant economic benefits. For example, with the conventional structure, if an automatic assembly machine was used for assembly, three assembly machines were required.
In this embodiment, only one unit is required.

〔Effect of the invention〕

As explained above, according to the present invention, the first member;
Since it is integrally connected to the second member, it is possible to complete the assembly of the tape guide by essentially assembling one part, and it is possible to complete the assembly of the tape guide with only extremely simple work. In addition, instead of requiring three automatic assembly machines as in the prior art, the present invention requires only one automatic assembly machine, which can bring significant economic benefits.

[Brief explanation of the drawing]

FIG. 1 and FIG. 2 are explanatory diagrams showing one embodiment of the present invention,
FIG. 1 is a partially cutaway front view of a tape guide of a magnetic recording and reproducing apparatus according to the present invention, FIG. 2 is an exploded perspective view, and FIGS. 5 and 6 are views of a tape guide of a conventional magnetic recording and reproducing apparatus. 5 is a plan view of essential parts showing the tape running mechanism of the VTR, FIG. 4 is a perspective view showing the tape running mechanism of the VTR, FIG. 5 is a front view showing the mounting state of the tape guide, and FIG. FIG. 6 is an exploded perspective view of the tape guide. 4... Magnetic tape, 9... Support shaft, 20... Tape guide, 21... First member, 22... Second member. E'

Claims (1)

[Claims] 1. In a magnetic tape guide having flanges at both ends to regulate and guide the running height of the magnetic tape, a first member having a substantially cylindrical shape having a flanged portion on the one end side, and a flanged portion on the other end side. 1. A tape guide for a magnetic recording and reproducing device, characterized in that a second member having a section and a female screw section is integrally connected to the second member.