JPH056747B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a positioning mechanism for a tape guide of a magnetic recording/reproducing device, and more particularly to a mechanism suitable for accurately positioning a tape guide close to a rotating cylinder.

[Background of the invention]

In conventional magnetic recording and reproducing devices, the tape guide is generally positioned by using a catcher to position and hold a block on which the tape guide is mounted. Further, the catch is mounted in a predetermined position on the base to which the rotary cylinder is fixedly positioned. Therefore, in such an apparatus, the positional relationship between the rotary cylinder and the tape is maintained through the precision and mounting precision of each of the base and catcher parts. In particular, the precision of the position and angle of the tape guide close to the rotating cylinder with respect to the rotating cylinder tends to affect the running performance of the tape, the head-tape contact, etc., and therefore the necessary and sufficient precision must be maintained.

Particularly when the tape is wound around the rotary cylinder almost over its entire circumference (for example, around 300° to 340°), the tape guide closest to the rotary cylinder has to be quite close to the rotary cylinder. In addition, in this case, the distance between the tape guide and the contact point of the tape on the rotating cylinder is inevitably shortened, so the positional accuracy of the tape guide has a greater influence on the winding angle around the cylinder, etc. Positional accuracy is required.

[Purpose of the invention]

It is an object of the present invention to solve the above-mentioned disadvantages of the prior art, and to provide a tape guide positioning mechanism for a magnetic recording and reproducing device that can realize the position and angle accuracy of the tape guide with respect to the cylinder more accurately and with better reproducibility than ever before. Our goal is to provide the following.

[Summary of the invention]

The features of the present invention are as follows: (a) A tape is loaded into a cylinder device equipped with a rotating magnetic head, and when the loading is completed, the tape is arranged adjacent to the cylinder device and wound around the cylinder device as the tape runs. In a positioning mechanism for a tape guide of a magnetic recording/reproducing device, the tape guide is held in a predetermined position or posture by a positioning member attached to a fixed cylinder, (b) the positioning member is (a) ) a first tape guide positioning surface that is fixed to the outer circumferential surface of the fixed cylinder and is arranged at a predetermined distance from the outer circumferential surface and holds the tape guide; (b) a tape guide positioning surface that holds the tape guide; a second tape guide positioning surface that holds the tape guide at a position on the opposite side in the width direction of the tape with respect to the first tape guide positioning surface at a predetermined distance from the first tape guide positioning surface; tape guide positioning surface and the second
The length in the direction in which the tape guide positioning surface is arranged is longer than the length of the tape guide.

With this configuration, the tape guide can be positioned easily and accurately.

[Embodiments of the invention]

Embodiments according to the present invention will be described in detail with reference to FIGS. 1 to 5. FIG. 1 shows a plan view around the rotating cylinder. 1 is a rotary cylinder; 2 and 3 are magnetic heads mounted on the rotary cylinder 1; 4 and 5 are fixed guides on the entrance and exit sides positioned near the rotary cylinder 1; and 6 and 7 are magnetic tape 8 running. These are entry and exit guide rollers for changing direction. The magnetic tape 8 travels in the direction of arrow B, and is spirally wound around the rotary cylinder 1 by a predetermined angle θ by the fixed guides 4 and 5 on the entrance and exit sides. Further, the rotating cylinder 1 rotates in the direction of arrow A, and the magnetic heads 2 and 3 scan the magnetic tape 8 obliquely.

FIG. 2 is a diagram of a pattern on the magnetic tape 8 obtained by this apparatus, viewed from the magnetic surface side. Tracks indicated by 2a to 2f, etc. in the figure are the scanning trajectories by the magnetic head 2, and tracks indicated by 3a to 3f, etc. are the scanning trajectories of the magnetic head 3 relative to the magnetic head 2 for each subscript. The positional relationship between the magnetic heads 2 and 3 is such that the magnetic head 3 is located at a position corresponding to the winding angle θ in the rotating plane of the head, and the magnetic head 3 is located at a position corresponding to the wrapping angle θ in the rotation plane of the head.
is mounted at a position lower than the magnetic head 2 by h. The magnetic head 2 scans the range of the winding angle .theta., and the magnetic head 3 scans the range corresponding to 2.pi.-.theta. where the magnetic head 2 does not come into contact with the magnetic tape 8.

Next, a method for positioning the tape guide will be described with reference to FIGS. 3 to 5. FIG. 3 shows the structure of the rotary cylinder 1. The rotating cylinder 1 is an upper fixed cylinder 9,
It consists of a middle rotating cylinder 10 and a lower fixed cylinder 11. The middle rotating cylinder 10 is equipped with magnetic heads 2 and 3, and the lower fixed cylinder 11 is provided with a lead 23 for guiding the running of the magnetic tape 8. There is. Also upper and lower fixed cylinders 9 and 1
1 is connected to a connecting member 12. Connecting material 12
are a regulating surface 13 for determining the clearance with the rotary cylinder 1 for positioning the tape guide, and a regulating surface 14 for determining the position around the rotary cylinder.
and a member 15 for determining the height. FIG. 4 shows the structure of tape guides. The entrance fixed guide 4 and the entrance guide roller 6 are implanted in the base 16. Further, in the front of the base 16, there is a recess 24 that engages with the protrusion 15 of the connecting member 12.
However, bosses 17 and 18 are provided further below to guide the movement of the base 16. Boss 18 has
An arm 19 containing a spring 21 is rotatably connected, and the other end of the arm 19 engages with a pin 20 provided on a loading ring 22 to transmit the driving force from the loading ring 22. FIG. 5 is a partial sectional view showing a state in which the tape guide is positioned. The entrance fixed guide 4 is fixed at its upper and lower sides by the regulating surfaces 13 and 14, and its height is determined at a predetermined position by the engagement of the projection member 15 and the recess 24.

〔Effect of the invention〕

As explained above, according to the present invention, in order to directly determine the gap between the cylinder and the tape guide closest to it by the positioning means such as a member,
Very narrow gaps can be defined with high precision and high reproducibility. At the same time, it is also possible to prevent accidents in which the tape guide comes into contact with the rotating cylinder or magnetic head.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the rotating cylinder and its surroundings in an embodiment of the present invention, Fig. 2 is a pattern diagram recorded on a magnetic tape, Fig. 3 is a perspective view of the rotating cylinder, and Fig. 4 is a perspective view of the tape guide. , FIG. 5 is a partial cross-sectional view of the rotary cylinder and tape guide. 1... Rotating cylinder, 2, 3... Magnetic head,
4...Inlet fixed guide, 5...Outlet fixed guide,
6... Inlet guide roller, 7... Outlet guide roller, 8... Magnetic tape, 9... Upper fixed cylinder,
10... Medium rotation cylinder, 11... Lower fixed cylinder, 12... Connecting material, 13, 14... Regulating surface, 1
5... Projection member, 16... Base, 24... Recessed portion.

Claims (1)

[Scope of Claims] 1. A tape is loaded into a cylinder device equipped with a rotating magnetic head, and when the loading is completed, the tape placed adjacent to the cylinder device and wound around the cylinder device is placed in a predetermined position with respect to the running of the tape. In the tape guide positioning mechanism of a magnetic recording/reproducing device, the tape guide is held in a position or attitude by a positioning member attached to a fixed cylinder, and the positioning member is attached to the outer circumferential surface of the fixed cylinder. a fixed tape guide positioning surface that holds the tape guide and is spaced a predetermined distance from the outer peripheral surface; and a first tape guide that is fixed and spaced a predetermined distance from the tape running surface of the cylinder device. a second tape guide positioning surface that holds the tape guide at a position opposite to the positioning surface in the width direction of the tape, the first tape guide positioning surface and the second tape guide positioning surface; A positioning mechanism for a tape guide of a magnetic recording/reproducing device, characterized in that the length in the direction in which the tape guide is arranged is longer than the length of the tape guide.