JPS5814357A - Magnetic tape device - Google Patents

Abstract

PURPOSE:To perform a high-precision tracking stably, by arranging two taper posts before and after a capstan to incline a magnetic tape in opposite directions. CONSTITUTION:A magnetic tape 29 has the lower position regulated by taper posts 20 and 21, and taper posts 15 and 20 are arranged in the slide face side and the magnetic face side of the tape respectively before and after a capstan 19. That is, the magnetic tape 29 twisted in opposite directions by taper posts 15 and 20 arranged in the front side and the rear side of the tape respectively, and these twists are cancelled near the intersection between the capstan 19 and a pinch roller 17. Similarly, twists due to taper posts 23 and 16 are cancelled by taper posts 23 and 16 arranged in the magnetic face side and the slide face side of the tape 29 respectively. Thus, a high-precision tracking is performed stably.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic tape device that requires high-precision tracking characteristics, such as a fixed head PCM tape recorder, and the present invention has a simple configuration of a tapered post and a capstan, so that it can be easily applied to a capstan. The purpose is to stabilize the position of the tape in contact, realize stable and precise tracking, and increase the reliability of high-density recording. The main parts of a conventional magnetic tape device are explained with drawings. do. FIG. 1 is a front view, and FIG. 2 is a sectional view taken along the line B-i (hatching is omitted). In the figure, 1 is a magnetic tape, 2 is a narrow track width multi-track magnetic head, and 3 is a magnetic tape.
, 4 are guide posts, of which the guide post 3 is a parallel post and the guide post 4 is a tapered post. 6
is a capstan.

6 is a pinch roller that faces and comes into contact with the capstan, and 7 is a running board. Note that each of the above-mentioned parts is mounted perpendicularly to the running board 7, and arrow A indicates the tape running direction. The above configuration is one of the methods of regulating the position of the tape piece using the tapered post 4 in order to obtain tracking reproducibility. This is to stabilize the position of the tape in the head 2. In this case, since the magnetic tape 1 is twisted by the tapered post 4, the capstan 6
, it enters with an inclination to the pinch row 26. FIG. 2 illustrates the twisted state of the magnetic tape 1. As shown in FIG.

Originally, 37 for capstan 6 and pinch roller 6.

Therefore, it is desirable that the magnetic tape 1 be parallel with as little twist as possible, so that the position of the tape 1 at the line of intersection between the capster/6 and the pinch roller e is more stable. On the other hand, if the magnetic tape 1 is twisted relative to the capstan 6 and the pinch roller 6, the position of the magnetic tape 1 will be difficult to stabilize.
For example, specifically, a problem arises in that it takes several seconds for the position of the magnetic tape 1 (the position on the intersection line of the capstan 6 and the pinch roller 6) to become stable after the pinch roller 6 is pressed. In a magnetic tape device having a multi-head and requiring high-precision tracking as shown in FIG.
Stability became an important issue. In other words, fluctuations in the magnetic tape 1 at the capstan 6 affect fluctuations at the magnetic head 2, and the higher the accuracy of tracking, the more minute fluctuations of several microns become a problem. . On the other hand, in the above-mentioned conventional structure, the magnetic tape 1 enters with an inclination to the intersection line of the capstan 5 and the pinch roller 6, which apply a driving force to the magnetic tape 1, so that one-sided elongation deformation of the tape occurs. These problems can be solved by taper post 4
If a parallel post similar to the guide post 3 is additionally arranged between the guide post 3 and the capstan 6, this may be a temporary solution, but this increases the number of running parts and requires new space, which is not preferable.

Honsho is intended to solve the above problems.

This device is characterized by having a structure in which the direction of inclination of the tape is reversed before and after the capstan. Below is book J! An embodiment of Q will be described based on the drawings.

FIG. 3 is a plan view showing an embodiment of a magnetic tape device on the main island. In the figure, 11 is a supply reel, 12 is a take-up reel, 13.14 is a guide post, and 16.16 is a guide post of a tapered post.
This will be explained in detail using FIG. 7. 19 is the capstan,
17.18 are pinch rollers, 20, 21. ♀2, 23 are tape (post guide boss, 24, 25, 26, 2
7 is a magnetic head for erasing, recording, and reproducing; 28 and 29 are driven by being held between a capstan 19 and pinch rollers 17 and 18, and are sent from the supply reel 11 to the take-up reel 12. Figure 4 shows arrow C in Figure 3.
This is a side view seen from the direction.

FIG. 6 is a side view similarly seen from the direction of the arrow.

In FIGS. 4 and 6, 30 is a running board, and each running component is mounted perpendicularly to this board. The numbers of the traveling parts correspond to those in FIG.

In FIG. 4, the magnetic tape 29 is tapered (tapered) 20.
The lower position is regulated by the head 21, and highly accurate tracking is performed by the heads 24 and 26. Further, the tapered posts 16 and 20 are arranged before and after the capstan 19, and on the smooth side and magnetic side of the tape, respectively.

FIG. 6 is a cross-sectional view taken along the line E-E' in FIG. 4 (note that "/" is omitted), and illustrates the twisted state of the magnetic tape 29. FIG. That is, the magnetic tape 29 receives twisting in opposite directions from the tapes 61, 16, 20 arranged on the front and back sides of the tape, respectively. .

Therefore, near the intersection line between the capstan 19 and the pinch roller 17, the front and rear torsions cancel each other out. Similarly in FIG. 6, the magnetic tape 29 is Cagnutan 190.
At the front and rear, tapered posts 23 and 16 are arranged on the magnetic side and the smooth side of the tape, respectively, and the tape is twisted in opposite directions from each side. FIG. 7 shows F − of FIG. 6.
This is a cross-sectional view F', illustrating the twisted state of the tape. In this case as well, the twisting caused by the tapered posts 23 and 16 cancels each other out near the intersection line between the capstan 19 and the pinch roller 18.

This will be further explained using FIG. 8. FIG. 8 shows a twisted state of the magnetic tape, and it may be assumed that there are tapered posts at both ends of the figure. Since both ends of the magnetic tape are tilted in opposite directions,
There is a portion with relatively little slope as shown by arrow G. By crimping the capstan and pinch roller from the front and back sides at the part indicated by arrow G, the twist state of the magnetic tape changes almost completely before and after the crimping point 7:,
.

In other words, stable tape drive can be obtained. Therefore, it is possible to shorten the time from when the pinch roller operates to when tracking becomes stable. Furthermore, since it is difficult to apply excessive force to the magnetic tape when the pinch roller is pressed, it is possible to prevent the magnetic tape from being stretched or deformed on one side.

As is clear from the above examples, according to Honya, 2
By arranging the book's tapered post before and after the capstan and making the magnetic tape tilt in opposite directions, fluctuations in the tape position at the capstan can be reduced and high-precision tracking can be performed stably. becomes possible. Furthermore, even if a tapered post must be provided close to the capstan, it is possible to prevent pinch roller pressure bonding and one-sided stretching deformation of the magnetic tape due to capstan drive. Therefore, more stable and highly accurate tracking becomes possible, and reliability can be improved even in high-density recording and reproduction, which has great practical effects.

[Brief explanation of the drawing]

FIG. 1 is a front view of essential parts of a conventional magnetic tape device, FIG. 2 is a sectional view taken along line BB' in FIG. Figure 4 is a side view from direction C in Figure 3, Figure 6 is a side view from direction D in Figure 3,
Figure 6 is an E-Σ' cross-sectional view of Figure 4, Figure 7 is Figure 5 OF
F sectional view/FIG. 8 is a plan view for explaining tape twisting. 15.16...Theba Post, 17.18...
...Pinch roller%19...Capstan, 20.23...Taba post. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure bow' Figure 2 Figure 3 Figure 4 Figure 6 Figure 7 ↓

Claims (1)

[Claims] A first tapered post is provided on the entry side of the capstan, and a second tapered post is provided on the inlet side of the capstan.
A tapered post is provided on the exit side of the capstan, and the direction in which the magnetic tape is tilted by the second tapered post is opposite to the direction in which the magnetic tape is tilted by the first tapered post. tape device.