JPH08329569A - Tape guide post in magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE: To properly fit a cap to an upper end part of a post main body. CONSTITUTION: The tape guide post 7 for guiding a magnetic tape T drawn out of a tape cassette has the post main body 17 equipped with a lower end large diameter part 17a for supporting the lower end periphery of the magnetic tape T and an upper end small diameter part 17b for supporting a tape surface of the magnetic tape T, which is projectingly provided to be concentric and integral with an upper end part of the lower end large diameter part 17a. Then, a guide pipe 18 is rotatably fitted onto the upper end small diameter part 17b, and the cap 19 for supporting an upper end periphery of the magnetic tape T is attachably and detachably fitted to the upper end part of the post main body 17. On the tape guide post in this magnetic recording and reproducing device, the cap 19 is formed with an annular groove 22 to be engaged with an upper end part of the guide pipe 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape guide post in a magnetic recording / reproducing apparatus.

[0002]

2. Description of the Related Art A schematic structure of a magnetic recording / reproducing apparatus will be described with reference to FIG. 5, where 1 is a tape cassette having a supply reel 1a and a take-up reel 1b, and 2 is a magnetic tape T drawn from the tape cassette 1. Tape guide post for winding around the head cylinder 3, 4 full width erasing head, 5 voice erasing head, 6 voice / control head, 7 fixed tape guide post, 8 back tension post, 9 cap The stun 10 is a pinch roller support mechanism having a support arm 12 rotatably supported by a pivot shaft 11, and a pinch roller 13 is pivotally attached to one end of the support arm 12 and the other end thereof. The cam pin 14 provided in the portion is fitted in the cam groove 15 a of the rotary cam 15.

In the above structure, when the magnetic tape T for recording, reproduction, etc. is run, the magnetic tape T is pulled out from the tape cassette 1 by the movable side tape guide post 2 and wound around the head cylinder 3 as shown in FIG. By rotating the cam 15 by a predetermined angle and rotating the support arm 12, the pinch roller 13 is pressed against the capstan 9 via the magnetic tape T, and the capstan 9 is rotationally driven to move the magnetic tape T. It is designed to be run, recorded and played back.

Conventionally, the fixed side tape guide post 7 is used.
As shown in FIG. 6, is a cylindrical post having a lower-end large-diameter portion 17a erected on the chassis 16 and an upper-end small-diameter portion 17b integrally and concentrically provided on the upper end of the lower-end large-diameter portion 17a. The main body 17, a guide pipe 18 rotatably fitted to the upper end small diameter portion 17b, and a cap 19 detachably attached to the upper end portion of the post body 17 are provided. The tape surface is supported, and the cap 19 and the lower end large diameter portion 17 are provided.
Both the upper and lower edges of the magnetic tape T are supported by a, so that the magnetic tape T can be linearly run without meandering. Also, the movable side tape guide post 2
The same applies to the above.

[0005]

In the above-mentioned structure, the cap 19 has a flange portion 19a having a diameter substantially equal to that of the large diameter lower end portion 17a, and a through hole of the post body 17 protruding from the lower surface of the flange portion 19a. Pin portion 19b press-fitted into 20, and collar portion 1
9a is provided on the upper surface of 9a, and the grip portion 19c is gripped to press the pin portion 19b into the through hole 20 of the post body 17 so that the collar portion 19a contacts the upper end of the guide pipe 18. By contacting each other, the distance H between the collar portion 19a and the lower end large diameter portion 17a is set according to the width of the magnetic tape T with reference to the length of the guide pipe 18, as shown in FIG. As shown in FIG. 5, the lower surface 19A of the collar portion 19a forms the restriction surface 20 of the magnetic tape T and the pressure receiving surface 21 of the guide pipe 18, and the restriction surface 20 and the pressure receiving surface 21 are close to each other on the same surface. Therefore, the pin portion 1
When the press-fitting of 9b is too strong, as shown by the solid line in FIG. 7, the collar portion 19a is strongly pressed against the upper end of the guide pipe 18 to be deformed, and the regulation surface 20 of the magnetic tape T is displaced, so that the distance H becomes smaller. The width of the magnetic tape T becomes too wide, which prevents the magnetic tape T from running linearly, which may disturb the image or sound.

Therefore, if the press-fitting of the pin portion 19b is weakened, even in this case, the flange portion 19a does not come into contact with the upper end of the guide pipe 18 and the gap H becomes too wide with respect to the width of the magnetic tape T. There is

In view of the above-mentioned conventional problems, it is an object of the present invention to provide a tape guide post in a magnetic recording / reproducing apparatus in which the cap can be properly attached to the upper end of the post body.

[0008]

To achieve the above object, the present invention provides a taper guide post for guiding a magnetic tape pulled out from a tape cassette, which has a large diameter portion at a lower end for supporting a lower end edge of the magnetic tape. And a post main body having an upper end small diameter portion for integrally supporting the tape surface of the magnetic tape by concentrically projecting from the upper end portion of the lower end large diameter portion, and a guide pipe is provided at the upper end small diameter portion. In a tape guide post in a magnetic recording / reproducing apparatus, which is rotatably fitted to the outside and a cap for supporting an upper edge of a magnetic tape is detachably attached to an upper end portion of the post body, an upper end of the guide pipe is attached to the cap. It is characterized in that an annular groove for fitting the portion is formed.

[0009]

In the above structure, when assembling the tape guide post, the guide pipe is fitted to the small diameter portion of the upper end of the post body, and then the cap is attached to the upper end portion of the post body to form the lower surface of the cap. The upper end of the guide pipe may be fitted in the annular groove.

In this case, since the pressure receiving surface of the guide pipe is formed by the bottom surface of the annular groove, and the regulating surface of the magnetic tape T is separated from the pressure receiving surface, even if the cap is strongly pressed against the post body to be mounted. It is possible to properly set the gap between the cap and the lower-end large-diameter portion of the post main body according to the width of the magnetic tape without the displacement of the regulation surface.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a tape guide post 7 according to an embodiment of the present invention, in which a collar portion 19 of a cap 19 is shown.
An annular groove 22 into which the upper end of the tape guide post 7 is fitted is formed in the lower surface 19A of a. With a configuration other than the above, FIG.
Further, the same parts as those of the conventional example shown in FIG. Since the movable side tape guide post 2 has almost the same structure, its description is omitted.

In the above structure, the tape guide post 7
The assembling procedure will be described. After the guide pipe 18 is externally fitted to the upper end small diameter portion 17b of the post body 17, the cap 1
It suffices to grip the gripping portion 19c of No. 9 and press the pin portion 19b into the through hole 20 of the post body 17. by this,
The upper end portion of the guide pipe 18 is fitted into the annular groove 22 of the flange portion 19a, and the flange portion 19a and the lower end large diameter portion 17 of the post body 17 are inserted.
The interval H between the magnetic tape T and a is set according to the width of the magnetic tape T.

In this case, the pressure receiving surface 21 of the guide pipe 18 is formed by the bottom surface of the annular groove 22.
Since 1 is separated from the regulation surface 20 of the magnetic tape T, even if the pin portion 19b is press-fitted too strongly, the regulation surface 2
It is possible to properly set the interval H according to the width of the magnetic tape T without causing the position shift of 0.

When the upper end portion of the guide pipe 18 is fitted into the annular groove 22, the inner surface and the upper end surface of the guide pipe 18 come into contact with the cap 19, so-called two points. Can be firmly attached to.

[0015]

According to the present invention, since the pressure receiving surface of the guide pipe is formed by the bottom surface of the annular groove formed in the cap, and the pressure receiving surface is separated from the regulation surface of the magnetic tape formed on the cap, the cap is removed. Even if the magnetic tape is attached by pressing it strongly against the post body, the restriction surface does not shift its position, and the upper and lower edges of the magnetic tape are properly supported by the cap and the lower large diameter portion of the post body, and the magnetic tape is attached. It is possible to drive in a straight line, and there is no fear that the image or sound will be disturbed.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a tape guide post according to a first embodiment of the present invention.

FIG. 2 is a view as viewed in the direction of arrows AA in FIG. 1;

FIG. 3 is an enlarged longitudinal sectional view of the main part.

FIG. 4 is an exploded perspective view of the same.

FIG. 5 is a schematic plan view of a magnetic recording / reproducing apparatus.

FIG. 6 is a vertical cross-sectional view of a conventional tape guide post.

FIG. 7 is an enlarged vertical sectional view of the main part.

[Explanation of symbols]

 1 tape cassette 7 tape guide post 17 post body 17a post body lower end large diameter portion 17b post body upper end small diameter portion 18 guide pipe 19 cap 22 annular groove T magnetic tape

Claims (1)

[Claims] 1. A tape guide post for guiding a magnetic tape pulled out from a tape cassette, and a large diameter lower end portion for supporting a lower end edge of the magnetic tape, and a concentric unit with an upper end portion of the large diameter lower end portion. The post main body is provided with an upper end small diameter portion for supporting the tape surface of the magnetic tape, and a guide pipe is rotatably fitted to the upper end small diameter portion. In a tape guide post in a magnetic recording / reproducing apparatus to which a cap for supporting the upper edge of the tape is detachably attached, an annular groove for fitting the upper end of the guide pipe into the cap is formed. A tape guide post in a characteristic magnetic recording and reproducing device.