JP3191370B2 - Tape guide - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a tape guide disposed on a tape running path such as T.

[0002]

2. Description of the Related Art A plurality of tape guides are provided on a tape traveling path such as a VTR and a DAT to guide a tape so that the traveling path is properly maintained.

FIG. 3 shows an example of a tape guide.
In FIG. 1, reference numeral 1 denotes a cylindrical guide support shaft. The guide support shaft 1 is configured such that a small-diameter portion 1a extends above the upper surface of the large-diameter portion 1b, and a middle-diameter portion 1c extends below the lower surface of the large-diameter portion 1b. A screw portion 1d is formed on the upper end side of the small diameter portion 1a. A coil spring 2 is arranged on the upper surface side of the large diameter portion 1b of the guide support shaft 1 in a state of being fitted into the small diameter portion 1a.

[0004] Reference numeral 3 denotes a disc-shaped lower flange member 3, and a round hole 3 a slightly larger in diameter than the small diameter portion 1 a of the guide support shaft 1 is formed in the center of the lower flange member 3. The lower flange member 3 is disposed on the upper surface side of the spring 2 in a state of being slidably fitted in the small diameter portion 1a. Even without the above, the diameter of the spring 2 is
The diameter of the large diameter portion 1 b of the guide support shaft 1 and the diameter of the lower flange member 3 are smaller.

[0005] Reference numeral 4 denotes a cylindrical sleeve, and an upper flange portion 4a having substantially the same diameter as the lower flange member 3 is integrally formed on the upper end side. The inner diameter of the sleeve 4 is the guide support shaft 1.
The sleeve 4 is arranged on the upper surface side of the lower flange member 3 in a state of being slidably fitted in the small diameter portion 1a. In this case, the length of the sleeve 4 is set such that the distance between the upper surface of the lower flange member 3 and the lower surface of the upper flange portion 4a is slightly longer than the width of the tape T.

Reference numeral 5 denotes a cylindrical roller guide, which is located on the outer peripheral side of the sleeve 4 and is connected to the lower flange member 3 and the upper flange portion 4.
a. The inner diameter of roller guide 5 is sleeve 4
And the axial length of the roller guide 5 is made shorter than the distance between the lower flange member 3 and the upper flange portion 4a. The clearance (gap) between them is always ensured, and the roller guide 5 is rotatable between the lower flange member 3 and the upper flange portion 4a.

Reference numeral 6 denotes a height adjusting screw which is screwed to a screw portion 1d formed on the upper end side of the small diameter portion 1a of the guide support shaft 1. The lower flange member 3, the sleeve 4, and the tape guide portion 7 including the roller guide 5 are always urged upward by the spring 2, but the height adjustment screw 6 restricts the upper position of the tape guide portion 7. By rotating the height adjusting screw 6, the height of the tape guide portion 7 is adjusted.

[0008] The tape guide constructed as described above is fixed to the chassis 8 by press-fitting the middle diameter portion 1c of the guide support shaft 1 into a round hole 8a formed in the chassis 8.

When the tape guide thus formed is disposed on the tape running path, the position of the tape T in the height direction is regulated by the lower flange member 3 and the upper flange portion 4a of the tape guide portion 7 as shown in the figure. You will be traveling. In addition, the roller guide 5
Is rotated, so that the tape T runs smoothly.

[0010]

In the tape guide having the above-described structure, the height of the tape guide 7 is adjusted after the mechanical deck is assembled so that the tape T always passes the correct position with respect to the drum stably. After that, the height does not change regardless of the tape running.

For this reason, when the tape T moves up and down when the running mode (reproduction, fast-forward, rewind, etc.) changes, the tape T is strongly applied to the lower flange member 3 and the upper flange portion 4a which regulate the position in the height direction. The tape T may be pressed, and abnormal side pressure may be applied to the tape edge, and the tape T may be damaged or damaged at the lower flange member 3 or the upper flange portion 4a such that the tape edge is broken or cut off. May be granted.

During the tape loading, the tape T is not likely to be in the correct tape running path, but is likely to be damaged as described above.

Accordingly, an object of the present invention is to suppress the lateral pressure applied to the tape edge to a certain value or less to reduce the damage given to the tape.

[0014]

According to the present invention, a roller guide is provided on the outer periphery of a cylindrical sleeve, and flange portions are provided at both ends of the cylindrical sleeve to constitute a tape running surface contact member. A first spring is provided on the flange side of the end, and a second spring is provided on the flange side of the other end, and the tape running surface contact member is slidably inserted into the cylindrical guide support shaft. The position of the tape is regulated by the flange portion of the tape running surface contact member inserted into the columnar guide support shaft, and the urging forces of the first and second springs are
When the pressure exerted by the tape on the flange portion exceeds a predetermined value, in the tape guide set so as to absorb the pressure by moving the tape running surface contact member in the axial direction of the cylindrical guide support shaft, the tape running surface contact member A round hole is formed in the lower flange member of the flange at both ends, and a claw portion smaller in diameter than the round hole is protruded corresponding to the round hole of the cylindrical sleeve in the tape running surface contact member, and the claw portion is a round hole. To restrict rotation of the flange portion of the tape running surface contact member.

[0015]

When the pressure of the tape T applied to the flange portion exceeds a predetermined value, that is, when an abnormal lateral pressure is applied to the tape edge, the flange portion is moved so as to absorb the pressure of the tape T. Thereby, the lateral pressure applied to the tape edge is reduced, and the damage given to the tape T is reduced.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. In FIG. 1, portions corresponding to those in FIG. 3 are denoted by the same reference numerals.

In FIG. 1, reference numeral 1 denotes a cylindrical guide support shaft. The guide shaft 1 has a small diameter portion 1a extending above the upper surface of the large diameter portion 1b and a middle diameter portion 1c extending below the lower surface of the large diameter portion 1b. Small diameter part 1
A threaded portion 1d is formed on the upper end side of a. Guide spindle 1
The coil spring 2 is arranged on the upper surface side of the large diameter portion 1b in a state of being fitted into the small diameter portion 1a.

Reference numeral 11 denotes a cylindrical sleeve, and a flange 11a is integrally formed at the lower end thereof. The inner diameter of the sleeve 11 is slightly larger than the small diameter portion 1a of the guide shaft 1, and the sleeve 11 is disposed on the upper surface side of the spring 2 in a state of being slidably fitted in the small diameter portion 1a. Even if not described above, the diameter of the spring 2 is the large diameter portion 1b of the guide support shaft 1.
And the diameter of the flange 11 a of the sleeve 11.

Reference numeral 4 denotes a cylindrical sleeve, and an upper flange portion 4a is integrally formed on the upper end side. The inner diameter of the sleeve 4 is slightly larger than the outer diameter of the main body of the sleeve 11, and the sleeve 4 is arranged so as to be able to smoothly move upward without being restricted by the flange 11 a while being fitted into the sleeve 11.

3 is an upper flange portion 4 of the sleeve 4 described above.
a circular lower hole 3a having substantially the same diameter as the outer diameter of the body of the sleeve 4 at the center thereof.
Are formed. After a roller guide 5 to be described later is fitted around the outer periphery of the sleeve 4, the lower end of the sleeve 4 is pressed into the round hole 3 a of the lower flange member 3, and
Is substantially integral with the sleeve 4.

Although not described above, the length of the sleeve 4 is set so that the distance between the upper surface of the lower flange member 3 and the lower surface of the upper flange portion 4a is slightly longer than the width of the tape T.

As shown in FIG. 2, a small-diameter round hole 3b is formed at a predetermined angular position of the lower flange member 3, and a round hole 3b is formed from the upper surface of the flange 11a of the sleeve 11.
A claw portion 11b having a smaller diameter than the round hole 3b is provided so as to correspond to
The claw portion 11b is loosely inserted into the round hole 3a. Thereby, rotation is prevented without hindering smooth upward movement of the sleeve 4 and the lower flange member 3, thereby stabilizing the tape running.

Reference numeral 5 denotes a cylindrical roller guide, which is located on the outer peripheral side of the sleeve 4 and is connected to the lower flange member 3 and the upper flange portion 4.
a. The inner diameter of roller guide 5 is sleeve 4
And the axial length of the roller guide 5 is made shorter than the distance between the lower flange member 3 and the upper flange portion 4a. The clearance (gap) between them is always ensured, and the roller guide 5 is rotatable between the lower flange member 3 and the upper flange portion 4a.

Reference numeral 6 denotes a height adjusting screw which is screwed to a screw portion 1d formed on the upper end side of the small diameter portion 1a of the guide support shaft 1. Although the sleeve 11 is always urged upward by the spring 2, the upper position of the sleeve 11 is restricted by the height adjusting screw 6. By rotating the height adjusting screw 6, the height of the sleeve 11 of the tape guide portion 7 is adjusted, and as a result, the lower flange member 3, the sleeve 4
The height of the tape guide portion 7 including the roller guide 5 is adjusted.

Reference numeral 12 denotes a coil spring, which is disposed between the upper flange portion 4a of the sleeve 4 and the height adjusting screw 6 so as to be fitted into the sleeve 11. The diameter of the spring 12 is smaller than the diameter of the upper flange 4 a of the sleeve 4 and the diameter of the height adjusting screw 6.

The spring 12 keeps the upper flange 4a of the sleeve 4 constantly urged downward. The spring force of the spring 12 is set as follows. That is, the tape T applied to the upper flange 4a of the sleeve 4 when the tape T moves up and down during the change of the running mode, and is larger than the pressure Fa applied by the tape T to the upper flange 4a of the sleeve 4 during the normal running of the tape T. Pressure F
b (at this pressure Fb, an abnormal lateral pressure is applied to the tape edge, and the tape T may be greatly damaged).

Here, since the values of the pressures Fa and Fb are different depending on the tape used, the winding angle of the tape around the tape guide, the tape tension, and the like, the spring force cannot be determined unequivocally. Can be easily obtained. Then, the setting and management can be easily performed by the space between the upper flange portion 4a of the sleeve 4 and the height adjusting screw 6 and the design and manufacturing management of the spring 12.

Even if the height of the tape guide 7 is adjusted by rotating the height adjusting screw 6, the upper flange 4
The distance between a and the height adjusting screw 6 does not change. Therefore, even if the height of the tape guide portion 7 is adjusted, the spring force of the spring 12 once set does not change.

The spring force of the spring 2 is set to be, for example, ten times or more the spring force of the spring 12.

The tape guide constructed as described above is fixed to the chassis 8 by press-fitting the middle diameter portion 1c of the guide support shaft 1 into a round hole 8a formed in the chassis 8. In addition, you may fix using a screw with press fitting or using only a screw.

When the tape guide thus formed is arranged in the tape running path, the position of the tape T in the height direction is regulated by the lower flange member 3 and the upper flange portion 4a of the tape guide portion 7 as shown in the figure. You will be traveling. In addition, the roller guide 5
Is rotated, so that the tape T runs smoothly.

In this embodiment, for example, when the tape running mode is changed, the tape T moves up and down, and the tape T causes the upper flange portion 4a of the sleeve 4 to have a pressure Fb (at this pressure Fb,
When abnormal side pressure is applied to the tape edge, and the tape T may be seriously damaged),
The upper flange 4a (sleeve 4) moves upward against the spring force of the spring 12. Therefore, an abnormal lateral pressure is not applied to the tape edge, and the tape T is not damaged or damaged so that the tape T is not damaged so much as to hinder reproduction.

Also, when pressure Fb is applied to the upper flange portion 4a of the sleeve 4 by the tape T during tape loading, the upper flange portion 4a moves upward in the same manner as described above, and is thus applied to the tape T. Damage is reduced. As a result, the degree of freedom in designing the guide path at the time of tape loading is increased, and the size of the mechanical deck can be reduced, and the loading time can be reduced (the loading guide moving speed can be increased).

In this embodiment, the upper flange portion 4a
Since the roller guide 5 also moves upward with the movement of the lower flange member 3 along with the movement of the (sleeve 4), the gap between the upper flange portion 4a of the sleeve 4 and the roller guide 5 increases with the movement. Therefore, it is possible to prevent the tape T from entering the gap and causing damage to the tape T. In this sense, when the movement amount is minute, only the upper flange portion 4a may be moved without moving the roller guide 5 together.

In the above embodiment, when the pressure Fb is applied to the upper flange portion 4a by the tape T,
The upper flange 4a (sleeve 4) is moved upward.
1 and the lower flange member 3, when the pressure Fb is applied to the lower flange member 3 by the tape T, the lower flange member 3 (sleeve 4) moves downward, and the tape Lateral pressure applied to the edge can be reduced.

In this case, the round hole 3b provided in the lower flange member 3 in the example of FIG. 1 is provided in the upper flange portion 4a of the sleeve 4, and the sleeve 1 in the example of FIG.
The claw portion 11b provided on one flange 11a is provided on the upper flange portion 4a side.

[0037]

According to the present invention, for example, when the tape pressure applied to the flange portion exceeds a predetermined value when the tape running mode is changed, that is, when an abnormal lateral pressure is applied to the tape edge, the tape pressure is absorbed. Since the flange portion moves as described above, the side pressure applied to the tape edge is reduced, and the damage given to the tape can be reduced.

Further, even when the pressure applied to the flange portion by the tape during the tape loading exceeds a predetermined value, the damage given to the tape is similarly reduced, so that the degree of freedom in designing the guide path at the time of tape loading is increased. ,
The size of the mechanical deck can be reduced, and the loading time can be shortened (the loading guide moving speed can be increased). Furthermore, since the rotation of the flange is prevented,
The tape running can be stabilized.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an essential part showing a configuration of an embodiment.

FIG. 2 is a diagram for explaining a rotation prevention mechanism.

FIG. 3 is a cross-sectional view of a main part showing a configuration of a conventional example, which is cut off.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Guide spindle 2, 12 Coil spring 3 Lower flange member 4, 11 Sleeve 4 a Upper flange part 5 Roller guide 6 Height adjustment screw 7 Tape guide part 8 Chassis T Magnetic tape

Claims (1)

(57) [Claims] 1. A roller guide is provided on the outer periphery of a cylindrical sleeve, and flange portions are provided at both ends of the cylindrical sleeve to constitute a tape running surface contact member. A first spring and a second spring are provided on the other end portion on the side of the flange portion, respectively.
The tape running surface contact member is slidably inserted into the cylindrical guide support shaft, and the position of the tape is regulated by the flange portion of the tape running surface contact member inserted into the cylindrical guide support shaft. The urging forces of the first and second springs move the tape running surface contact member in the axial direction of the columnar guide shaft when the pressure exerted by the tape on the flange portion exceeds a predetermined value. In the tape guide set so as to absorb the pressure, a round hole is formed in a lower flange member of a flange at both ends of the tape running surface contact member, and the round hole corresponds to the round hole of the cylindrical sleeve in the tape running surface contact member. A protrusion having a smaller diameter than the round hole is protruded and the rotation of the flange portion of the tape running surface contact member is restricted by loosely inserting the claw portion into the round hole. Tape guide characterized by doing.