JPH05114202A - Guide post roller of traveling tape in magnetic recording and replay apparatus - Google Patents

Abstract

PURPOSE:To eliminate that the advantage of a very small protrusion which smoothly separates a rotary head from a tape acts as an obstacle on the other hand. CONSTITUTION:In a magnetic recording and replay apparatus, the following are provided: a head cylinder 1 which is composed of a rotary cylinder 1a provided with a magnetic head 3 and of a fixed cylinder 1b in which a very small protrusion 1b1 has been installed near the separation part of a traveling tape 4; and guide posts 5, 6 for the tape 4. In the magnetic recording and replay apparatus, a head-mounted truncated, inverted-conic part 10b which deflects the upper side part of the tape 4 toward the inside is formed at the upper part of a roller 10 at the first guide post 6 at the downstream part in the tape traveling direction from the head cylinder 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guide post roller for a running tape in a magnetic recording / reproducing apparatus having a rotary head such as a VTR or DAT.

[0002]

2. Description of the Related Art A conventional head cylinder and a guide post in a magnetic recording / reproducing apparatus are shown in FIGS. The head cylinder 1 is a magnetic head (hereinafter referred to as a head).
3 and the upper portion of the rotary cylinder 1a having a groove 1a ₁ for a plurality of air film, fine protrusions 1b ₁ and the magnetic tape is formed outward in the upper part leads along the fourth lower side (hereinafter, referred to as tape) 1b _And a lower fixed cylinder 1b having ₂ . Guide posts 5 and 6 for restricting the running of the tape 4 are provided on the upper side and the lower side of the head cylinder 1 in the tape feeding direction.
Cylindrical rollers 7 and 8 are rotatably mounted on the roller 6.

Thus, the minute projections 1b ₁ are formed in the vicinity of the traveling tape 4 separating from the fixed cylinder 1b, and the separation portion region 4a on the upper side of the tape 4 is formed.
The hatched portion in FIG. 3A is separated from the outer peripheral surface of the head cylinder 1.

This is a mode in which the tape 4 is repelled when the head 3 which rotates in synchronism with the rotary cylinder 1a is detached from the tape 4, so that the tape 4 near the detached portion vibrates, which adversely affects the playback screen ( For example, the head 3 is smoothly detached from the tape 4 for the purpose of preventing the fluctuation of the screen).

[0005]

The minute protrusion 1b ₁ in the above-mentioned conventional example facilitates the detachment of the head 3 from the tape 4, while the detached portion region 4a of the tape 4 has a slack shape. . Then, the slackened detachment portion region 4a is vibrated by the air pressure when the head 3 which is rotating at a high speed is detached, and the vibration sound becomes harsh.

The present invention has been made in view of the above-mentioned problems, and a guide for a running tape in a magnetic recording / reproducing apparatus in which the advantage of the fine projections for smoothing the detachment of the rotary head from the tape is one of the obstacles is solved. The purpose is to provide a post roller.

[0007]

In order to achieve the above object, the present invention provides a head cylinder comprising a rotary cylinder having a magnetic head, and a fixed cylinder having a minute projection near the detaching portion of a running tape. In a magnetic recording / reproducing apparatus equipped with a tape guide post, a truncated conical taper portion that deflects the upper side of the tape inward is provided above the first guide post roller that is lower than the head cylinder in the tape traveling direction. It has been formed.

[0008]

Most of the outward slack in the detaching portion area of the running tape detached from the head cylinder is corrected by the inward deflection by the truncated conical taper portion formed on the upper portion of the guide post roller, The range of slack that causes vibration is reduced.

[0009]

Embodiments of the present invention will be described with reference to the drawings.
In the present invention, the rollers of the guide post of the running tape are different from those of the conventional example, and the other parts are the same. Therefore, the rollers of the guide post will be described, and the other parts are denoted by the same reference numerals as those of the conventional example. Is omitted. As shown in FIG. 1 and FIG. 2, the roller 10 rotatably mounted on the shaft 9 of the first guide post 6 which is lower than the head cylinder 1 in the tape traveling direction is a cylindrical portion 10a and an upper end of the cylindrical portion 10a. The taper portion 10b is formed in a truncated conical shape.

The tape 4 is provided above and below the roller 10.
The flanges 11 and 12 for restricting the movement are attached to the shaft 9, and the lower flange 12 is fixed with a nut 13 for attaching the guide post 6 to the main body of the recording / reproducing apparatus.

Then, as shown in FIG.
Most of the outward slack of the detached portion area 4a of the tape 4 that is detached from the head cylinder ₁ by 1 is corrected by the inward deflection by the tapered inverted conical taper portion 10b of the roller 10 of the guide post 6. (Shown with a mesh pattern 4b), the range of the slack which becomes a vibration factor is reduced, the vibration sound of the tape 4 is remarkably reduced, and it does not feel harsh.

[0012]

According to the present invention, since the head cylinder is provided with a minute projection and the taper portion having a truncated conical shape is formed above the roller of the first guide post on the tape running lower side than the head cylinder, the tape of the rotary head is formed. With the smooth separation from the head cylinder, most of the outward slack in the separation area of the tape separating from the head cylinder is corrected, and the vibration noise of the tape is remarkably reduced, and it is not harsh.

[Brief description of drawings]

FIG. 1 is a front view of a guide post of the present invention.

FIG. 2 is an explanatory diagram of a running state of a magnetic tape using a guide post.

FIG. 3 shows a conventional example, FIG. 3 (A) is an explanatory view of a running state of a magnetic tape, and FIG. 3 (B) is a perspective view of a fixed cylinder.

[Explanation of symbols]

1 Head Cylinder 1a Rotating Cylinder 1b Fixed Cylinder 1b ₁ Micro Protrusion 3 Magnetic Head 4 Magnetic Tape 4a Separation Area 6 Guide Post 10 Roller 10a Cylindrical Section 10b Tapered Section

Claims (1)

[Claims] 1. A rotating cylinder having a magnetic head,
In a magnetic recording / reproducing apparatus equipped with a head cylinder composed of a fixed cylinder provided with a minute protrusion near the detaching portion of the running tape and a tape guide post, above the roller of the first guide post which is lower than the head cylinder in the tape running direction. A guide post roller for a running tape in a magnetic recording / reproducing apparatus, wherein a taper portion having a truncated conical shape that deflects the upper side portion of the tape inward is formed.