JPH06243555A - Tape guide device - Google Patents

Abstract

PURPOSE:To ensure the contact between a tape and a head without adjustment by partially increasing a tension of the tape. CONSTITUTION:A thickened part 5 is formed at the upper part of an oblique guide 8 which presses the tape T onto a guide drum 1. The tape T abuts on the thickened part 5, then the tension in the upper part of tape T is increased. The contact between the tape T and rotating head 4 is ensured without adjustment by only the change of the shape of one oblique guide 8. A troublesomeness to adjust the plural oblique guides like as the conventional manner is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is, for example, a VTR, R-
The present invention relates to a tape guide device suitable for application to DAT (rotary digital audio tape recorder) and the like.

[0002]

2. Description of the Related Art A method in which a tape is wound diagonally around a guide drum and a rotary head is rotated (helical scan method).
In the VTR or the like, the guide pin is positioned near the guide drum when loading is completed so that the tape accurately contacts the rotary head.

FIG. 4 is a plan view showing a VTR guide drum, guide pins, and the like. FIG. 4 shows a state in which the tape cassette is loaded in the VTR, and the tape is pulled out from the tape cassette by the guide pin guided in the guide groove (not shown) and wound around the guide drum (state when loading is completed). Is shown.

In FIG. 1, reference numeral 1 is a tape guide drum (hereinafter referred to as "guide drum"), and this guide drum 1 is arranged on a chassis 6 with a predetermined inclination angle. As shown in FIG. 6, the guide drum 1 includes a lower drum 2 fixed to a chassis 6 (not shown in FIG. 6) and a rotating drum (upper drum) fixed to a motor shaft (not shown).
3 and a rotary head 4 disposed on the rotary drum 3 (see FIG.
B)). It should be noted that the lower drum 2 is provided with leads 2a for positioning the upper and lower positions of the tape T.

In FIG. 4, reference numerals 7 and 8 denote diagonal guides (guide pins), which are fixed to a guide base 9 (see FIG. 5) (in FIG. 5, the outlet of the guide drum 1). The one on the side is shown). Diagonal guide 7,
8 is arranged with a predetermined inclination angle so that the tape T is wound around the guide drum 1 obliquely.

Further, the guide base 9 is provided with vertical guides 10 and 11 as guide pins as shown in FIG. Diagonal guides 7, 8 and vertical guides 10, 1
1 is for winding the tape T around the guide drum 1 and pressing it.

A guide base 9 to which the oblique guide 7 and the vertical guide 10 are fixed is arranged on the inlet side of the guide drum 1, that is, on the left side. A guide base 9 to which the oblique guide 8 and the vertical guide 11 are fixed is arranged on the outlet side of the guide drum 1, that is, on the right side. The diagonal guides 7 and 8 and the vertical guides 10 and 11 on the inlet side and the outlet side are arranged at symmetrical positions as shown in FIG.

The guide base 9 is constructed so that it can be moved by being guided by a guide groove (not shown) formed in the chassis 6. Then, the tape cassette C is loaded into the VTR, and the tape T in the tape cassette C is pulled out by the oblique guides 7 and 8 and the vertical guides 10 and 11 and wound around the guide drum 1 at the time of recording and reproducing.

The rotary head 4 contacts the lower end of the tape T on the inlet side of the guide drum 1 and the upper end of the tape T on the outlet side during recording and reproduction (see the trajectory of the broken line in FIG. 6A).

As shown in FIG. 4, the chassis 6 has a plurality of posts (guide pins) 1 which come into contact with the tape T.
5, a full erase head 16, a control signal head 17, a pinch roller 18a, and a capstan 18b are arranged. Further, the tape cassette C is provided with a plurality of posts 19 for guiding the tape T, as shown by the broken line in FIG.

[0011]

By the way, the vertical guides 10 and 11 alone cannot reliably contact the tape T with the guide drum 1 (rotary head 4) obliquely arranged. Therefore, the oblique guides 7 and 8 are arranged and, for example, a tilt screw or the like for adjusting the inclination is arranged. In this case, in order to improve the contact between the tape T and the rotary head 4, the tilt of the oblique guides 7 and 8 is adjusted by a tilt screw or the like.

However, when the diagonal guides 7 and 8 are arranged one by one on the left and right sides of the guide drum 1, the tape T is bent almost at a stretch, so that the running stability of the tape T is impaired. Also, the conventional diagonal guide 8 on the exit side
As shown in FIG. 5, the portion contacting the tape T (shown by the chain double-dashed line in FIG. 5) has a straight shape (columnar shape) having the same diameter. Then, in the oblique guide 8 having this shape, as shown in FIG. 6B, the upper end of the tape T is not sufficiently pressed against the rotary head 4, and a gap S is formed between the rotary head 4 and the tape T, causing a spacing loss. To do.

In order to solve this problem, the inclination of a plurality of guide pins (oblique guides) (not shown) can be adjusted with, for example, a tilt screw so that the upper end of the tape T on the outlet side is close to the rotary head 4. Are known. In this case, in order to improve the contact between the tape T and the rotary head 4, the tilt of the oblique guide is adjusted with a tilt screw or the like.

In this case, since the tape T is not bent almost at a stroke at a stretch, the tape running can be stably maintained and the upper end of the tape T can be sufficiently pressed against the rotary head 4. However, in adjusting the inclination of the oblique guide, if the angle of one guide pin is changed, it is necessary to adjust the other oblique guides. Therefore, there arises a problem that the adjusting mechanism for adjusting the contact between the tape T and the rotary head 4 becomes complicated and the number of adjusting steps increases.

Therefore, it is an object of the present invention to provide a tape guide device which partially increases the tension of the tape and ensures contact between the tape and the head without adjustment.

[0016]

According to the present invention, in a tape guide device having an oblique guide arranged obliquely for pressing a tape against a tape guide drum, a predetermined part of the oblique guide is made thicker than other parts. It was done.

[0017]

Since the predetermined portion of the oblique guide (for example, the one on the outlet side of the guide drum 1) 8 is thicker than the other portions, the thick portion (thick portion) 5, 21, 22 partially increases the tape tension. To do. Therefore, the tape T surely contacts the head 4, so that the spacing loss can be reduced. Therefore, the tape T and the head 4 can be surely brought into contact with each other without adjustment by only changing the shape of the single oblique guide 8, and the troublesomeness of adjusting a plurality of oblique guides as in the conventional case can be eliminated.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. This example shows V shown in FIG.
This is an example applied to TR. 1 and 2, in FIG.
The parts corresponding to those in FIG. 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 1, 5 is a thick portion having a tapered surface 5a, and this thick portion 5 is formed on the upper portion of the oblique guide 8 on the outlet side. Here, the thick portion 5 is formed on the upper portion of the oblique guide 8 in order to increase the tension on the upper portion of the tape T. The thickness of the thick portion 5 is adjusted according to the amount of tension to increase the tape.

The tapered surface 5a is formed so that its diameter becomes thicker toward the upper part of the oblique guide 8. The tape T has a taper surface 5a as shown by the chain double-dashed line in FIG.
It comes into contact with and is bent gently.

Further, the oblique guide 8 and the vertical guide 11 arranged on the guide base 9 on the outlet side of the guide drum 1 of this embodiment.
Guides the tape T mainly with the vertical guide 11 during the loading of winding the tape T around the guide drum 1, and with the oblique guide 8 at the completion of the loading.
Is pressed against the guide drum 1.
This example is configured as described above, and is otherwise similar to the example of FIG.

In this example, when the loading is completed, the tape tension on the upper portion of the tape T is increased by the thick portion 5a of the oblique guide 8, so that the upper end of the tape T is pressed against the rotary head 4 side as shown in FIG. 2B. The upper end of the tape T is surely brought into contact with the rotary head 4. Therefore, spacing loss can be reduced.

According to this embodiment, the tape T and the rotary head 4 can be surely brought into contact with each other without adjustment by changing the shape of the single oblique guide 8 without changing the conditions of a plurality of guide pins (not shown). Therefore, according to this example, it is possible to eliminate the trouble of adjusting a plurality of guide pins as in the conventional case.

According to this embodiment, the tape T is mainly guided by the vertical guide 11 during loading, and the tape T is pressed against the guide drum 1 by the oblique guide 8 after the loading is completed. It is possible to prevent stress on the tape T due to the thick portion 5 of the oblique guide 8 inside.

FIG. 3 shows another embodiment. VT
Depending on the type of deck such as R, the portion where the tape tension is desired to be increased differs, so FIG. 3 is configured to accommodate this.

In the example of FIG. 3A, the thick portion 21 of the oblique guide 8 is not formed with a tapered surface. In the example of FIG. 3B, a thick portion 22 is formed substantially at the center of the diagonal guide 8.
Tapered surfaces 23 are formed above and below, respectively. According to this example, it is possible to increase the tension in the approximate center of the tape. Further, since the tapered surfaces 23 are formed above and below the thick portion 22,
The tape T can be bent smoothly. Other functions and effects of the above-described embodiments are similar to those of the example of FIG.

The portions for forming the thick portions 5, 21, 22 are not limited to those in the above-mentioned embodiments, and may be formed at the portions where the tension of the tape is desired to be increased. For example, when increasing the tension on the lower part of the tape, the tape can be formed on the lower part of the diagonal guide 8 in the same manner. Also, the shape of the thick part is
It is limited to the above-mentioned embodiments.

Further, the tape guide device of this example is a VTR.
However, if the present invention is of the helical scan type, the present invention can be similarly applied to, for example, R-DAT.

[0029]

According to the present invention, since the predetermined portion of the oblique guide is thicker than the other portions, the tension of the tape can be partially increased by the thick portion. Therefore, according to the present invention, the contact between the tape and the head can be surely made without adjustment by only changing the shape of the single oblique guide. Therefore, according to the present invention, it is possible to eliminate the trouble of adjusting a plurality of diagonal guides as in the conventional case.

[Brief description of drawings]

FIG. 1 is a diagram showing an example.

FIG. 2 is a diagram showing a usage state of the embodiment.

FIG. 3 is a diagram showing another embodiment.

FIG. 4 is a plan view of the VTR at the time of loading.

FIG. 5 is a diagram showing a conventional example.

FIG. 6 is a diagram showing a usage state of a conventional example.

[Explanation of symbols]

 1 guide drum 4 rotary head 5,21,22 thick part 5a, 23 taper surface 7,8 diagonal guide 9 guide base 10,11 vertical guide T tape C tape cassette S spacing between rotary head and tape

Claims (4)

[Claims] 1. A tape guide device comprising an oblique guide arranged obliquely for pressing a tape against a tape guide drum, wherein a predetermined part of the oblique guide is thicker than other parts. apparatus. 2. The tape guide device according to claim 1, wherein the oblique guide is an oblique guide arranged on the outlet side of the tape guide drum. 3. The tape guide device according to claim 1, wherein the predetermined portion is an upper portion of the oblique guide. 4. A vertical guide is arranged on a guide base together with the diagonal guide, and the tape is wound around the tape guide drum by the movement of the guide base. During the loading, the tape is mainly moved by the vertical guide. The tape guide device according to claim 1, wherein the tape is pressed against the tape guide drum by the oblique guide when the loading is completed.