JPH0447784Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a tape guide in a magnetic recording/reproducing device such as a video tape recorder (VTR), and particularly relates to a magnetic tape generated at the upper flange of the tape guide when the tape runs. The present invention relates to a tape guide structure suitable for preventing magnetic tape from curling and ensuring stable running of a magnetic tape.

[Background of the idea]

FIG. 4 shows the arrangement of a cylinder and a tape guide disposed near the cylinder in a magnetic recording/reproducing apparatus such as a VTR, which is the subject of the present invention. Fourth
In the figure, 1 indicates a cylinder. Cylinder 1 is
It consists of an upper cylinder 1b on which a magnetic head 1a is mounted and rotates at a predetermined rotational speed in the direction of arrow A, and a fixed lower cylinder 1d equipped with a lead 1c for defining the running position of the magnetic tape 2. There is. The magnetic tape 2 runs in the direction of arrow B,
The running direction is changed by the entrance guide roller 5, and the lead 1c is guided by the entrance inclined pin 3 along the lead 1c, and is wound around the outer peripheral surface of the cylinder 1 at a predetermined angle. The magnetic tape 2 that has come out of the lead 1c is guided to the output guide roller 6 by the output side inclined pin 4, the running direction is changed by the output side guide roller 6, and the magnetic tape 2 is returned to a cassette (not shown).

Here, in order to obtain a predetermined track tracing performance, it is necessary to run the tape stably along the lead 1c portion of the cylinder 1.

Next, 10~ used in conjunction with long-term recording.
A suitable tape regulation method for an ultra-thin tape with low rigidity of about 13 μm thickness will be explained using FIG. In FIG. 5, the cylinder 1 and the entry side inclined pin 3 are arranged so that the running tape shown by 2-B takes a running path that forms an elevation angle ηi on the entry side and an elevation angle ηo on the exit side with respect to the lead 1c of the cylinder. and exit side inclined pin 4
Set the relative position. Next, from both sides of the cylinder 1, the entrance guide roller 5 and the exit guide roller 6 are
By pressing and deforming the tape 2-B along the lead 1c by the upper flanges 5a and 6a, the tape 2-B is made to take a traveling path shown by 2-C. The magnetic tape 2 in this state has the lead 1
The leads 1c are subjected to forces Fi and Fo at the inlet and outlet ends of lead 1c, respectively, and are in a bending deformation state such that the deflection angles are ηi and ηo at the inlet and outlet ends of lead 1c.
That is, the magnetic tape 2 is subjected to forces Fi and Fo at the entrance and exit ends of the lead 1c of the cylinder 1.
It is pressed against the surface of the lead 1c and regulated.

According to the above regulation method, the tape 2 is pressed against the lead 1c by the upper flanges 5a and 6a of the guide rollers 5 and 6 on both sides, and as a reaction force, the tape 2 is bent and deformed in the width direction. The rising force that is generated is F.

By the way, the conventional tape guide shown in FIG.
An upper flange 5a and a lower flange 5c are press-fitted and fixed to the shaft 5E, and a rotating cylindrical portion 5d is provided therebetween. However, when the above-mentioned tape regulation method was used, the tape 2 rose to the position shown by the solid line due to the rising force F, and a curl I occurred at the upper flange 5a as shown by the broken line circle G. As a result, there were problems such as damage to the tape and deterioration of image jitter.

[Purpose of invention]

The purpose of the present invention is to prevent damage to the magnetic tape and performance deterioration such as an increase in image jitter by preventing curling of the magnetic tape caused by the upper flange of the tape guide when the tape is running. An object of the present invention is to provide a tape guide that can be used as a tape guide.

[Summary of the idea]

In the present invention, the upper flange of the guide roller is structured to have a protrusion that reaches the inclined pin part, thereby supporting the rising force F of the tape generated at the inclined pin part, and as a result, the tape is pushed onto the guide roller. It is restricted so that it runs parallel to the upper flange. This prevents the tape from curling, which conventionally occurs at the upper flange.

[Example of idea]

An embodiment of the tape guide according to the present invention will be described below with reference to FIGS. 1, 2, and 3.

In FIG. 1, 10 indicates a guide roller.
Here, 10d is a shaft, and this shaft 10d is press-fitted and fixed to the upper flange 10a.

Then, the upper flange 10a and the lower flange 10 are arranged so that the rotating cylindrical portion 10b can rotate.
An appropriate gap γ is formed between the shaft 10c and the rotating cylindrical portion 10b, so that the lower flange 10c is connected to the shaft 10.
d is press-fitted and fixed. FIG. 2 shows the shape of the upper flange 10a. Moreover, FIG. 3 shows a perspective view. Here, the upper flange 10a is extended to reach the inclined pin 11 portion, and the inclined pin 11 is configured to pass through the hole 10a'. As described above, by extending the upper flange of the conventional tape guide to reach the inclined pin part, the reaction force (rising force) from the lead is supported by this protruding part, and the upper flange 1
At 0a, the running position of the tape can be regulated within a plane perpendicular to the shaft 10d. As a result, it is possible to prevent the magnetic tape 2 from curling, which conventionally occurs at the end of the flange 10a as described above. The above guide roller 10 and inclined pin 1
1, when installed on one common base aircraft, the relative accuracy between the two can be particularly improved.

[Effect of idea]

According to the present invention, when the tape runs, the flange part of the tape guide extending to the inclined pin part supports the reaction force (rising force) from the lead, and the flange of the tape guide regulates the running position. The magnetic tape can be guided parallel to the inclined pin. As a result, curling that occurs in the flange of the conventional structure can be prevented, and performance deterioration such as damage to the magnetic tape and increase in image jitter can be prevented.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a main part showing the structure of a tape guide according to an embodiment of the present invention, Fig. 2 is a shape diagram of the upper flange of the tape guide according to the present invention, and Fig. 3 is a tape guide according to the present invention. FIG. 4 is a perspective view showing the configuration and arrangement of a tape guide in a magnetic recording and reproducing device;
FIG. 5 is an explanatory diagram showing the principle of tape regulation in the cylinder portion, and FIG. 6 is a structural diagram of a conventional tape guide. 1...Cylinder, 2...Magnetic tape, 1c...
Lead, 10... Guide roller, 11... Inclined pin, 10a... Upper flange.

Claims (1)

[Claims for Utility Model Registration] 1. A tape guide for a magnetic recording/reproducing device that is equipped with a guide roller having a flange portion and an inclined pin disposed adjacent to the guide roller and guides the running of the tape, wherein the guide roller is provided with a cylinder. A magnetic recording and reproducing device characterized in that a flange portion disposed on the side that sandwiches the tape with respect to the lead is constructed separately from the inclined pin and extends along the longitudinal direction of the tape to the position of the inclined pin. tape guide. 2. The guide roller has an engaging portion in which the flange portion disposed on the side that sandwiches the tape with respect to the lead of the cylinder is capable of sandwiching the inclined pin and moving in the direction of the center axis of the guide roller relative to the inclined pin. A tape guide for a magnetic recording/reproducing device according to claim 1 of the utility model registration claim, which has a configuration comprising: