JPS62293549A - Tape guide device - Google Patents

Abstract

PURPOSE:To prevent damage of tape magnetic face by quickening the peripheral speed of a tape guide part more than the running speed of a tape so as to form an air film between the peripheral face of the tape guide and the tape. CONSTITUTION:In delivering a torque to a pulley 21 from a drive source (not shown) via a belt 22, a tape guide 8 is driven and an air film 23 is formed between the tape guide 8 and the tape 18 and the tape 18 is not in contact with the peripheral face 19 of the tape guide 8. In running the tape 18 in this state, the running direction is changed by the tape 18 without being in contact with the peripheral face 19 of the tape guide 8. Plural slots 20 are formed to the face 19 of the section 8, then the contact area between the tape 18 and the tape guide 8 is decreased when the tape 18 is not driven and the initial adhesion of the tape 18 is prevented.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a tape guide device for changing the running direction of the tape, the inclination angle of the tape, etc.

[Summary of the Invention] The present invention provides a tape guide device that winds a tape around a tape guide portion and guides the tape to a predetermined state, and includes a tape guide device that rotates the tape guide portion at high speed to connect the outer circumferential surface of the tape guide portion with the tape. By configuring an air film between the edges, damage to the magnetic surface of the tape caused by the running tape coming into contact with the tape guide section can be avoided. This can prevent transmission of speed unevenness due to rotation of the guide portion.

[Prior Art] Generally, a magnetic recording/reproducing device such as a VTR or a tape recorder has a tape running path in order to bring the tape, which is a recording medium, into contact with a magnetic head at a predetermined position. A tape guide device is used to change the running direction of the tape, the tape inclination angle, etc. so that the tape runs along this tape running path.

Conventionally, these tape guide devices include a fixed type tape guide device in which a tape guide portion around which a tape is wound is fixed, and a rotary type tape guide device in which a tape guide portion around which a tape is wound is configured to be freely rotatable. Kaisho 6
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[Problems to be Solved by the Invention] However, the former fixed type tape guide device has the drawback that the magnetic surface is damaged because the tape slides on the tape guide portion.

If the magnetic surface is damaged, it may become demagnetized or generate constant noise.

Furthermore, tape wrapping has a disadvantage in that as the corner becomes larger, the tape running resistance also increases in proportion to the angle. for example,
When the winding angle is θ (rad) and the running friction coefficient is μ, the rate of increase in tape running resistance is eμθ.

On the other hand, the latter rotating type tape guide device has the disadvantage that the tape guide part also rotates as the tape runs, so that speed unevenness due to uneven rotation or eccentricity of the tape guide part is transmitted to the tape. was there.

Furthermore, since the tape guide section is rotatably provided, it is likely to vibrate, and this vibration is transmitted to the tape.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a tape guide device that eliminates the above-mentioned drawbacks.

[Means for Solving the Problems] To achieve the above object, the present invention provides a tape guide device that winds a tape around a tape guide portion and guides the tape to a predetermined state. The outer peripheral speed of the tape guide part is set higher than the running speed of the tape, and an air film is formed between the outer peripheral surface of the tape guide part and the tape.

[Effects] Therefore, the tape runs without direct contact with the tape guide section due to the air film, and the tape guide section is protected from the effects of damage, running load, speed unevenness, vibration, etc. that cause demagnetization and constant noise. I don't accept it.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, a hole 2 is formed in a chassis 1, and sub-chassis 3 are provided above the chassis 1 at regular intervals.

A tape guide hole 4 is formed in the sub-chassis 3 above the hole 2, and a support shaft 5 is disposed within the tape guide hole 4.

This support shaft 5 has a threaded portion 6 formed at its upper end and a large diameter portion 7 at its lower portion, and this large diameter portion 7 is press-fitted into the hole 2 of the chassis 1 .

The tape guide section 8 consists of a tape winding section 9 and an extending section 10 that is integrally provided below the tape winding section 9.

A shaft hole 11 is formed in the vertical direction of this tape guide portion 8, and the support shaft 5 is disposed within this shaft hole 11.
A sleeve 12 is provided in a protruding manner within the shaft hole 11 . Ball bearings 13a and 13b are provided between the tape guide section 8 and the support shaft 5 at two locations, upper and lower, and the tape guide section 8 is rotatably supported by the support shaft 5.

The upper ball bearing 13a is connected to the sleeve 12.
The lower ball bearing bearing 13b is in contact with the upper end surface and is in contact with the lower end surface of the sleeve 12, and both ball bearing bearings 13a and 13b are fixed to the tape guide portion 8 by adhesive or the like. is the support shaft 5
The tape guide portion 8 is not fixed to the support shaft 5, but is movable in the axial direction of the support shaft 5 together with the ball bearings 13a and 13b.

A boss portion 15a of an upper flange 15, which will be described below, comes into contact with the upper surface of the upper ball bearing 13a to restrict upward movement of the tape guide portion 8.

A spring receiver 16 is in contact with the lower surface of the lower ball bearing bearing 13b, and a spring 17 is interposed between the spring receiver 16 and the dog diameter portion 7 of the support shaft 5 to prevent the tape guide portion 8 from moving downward. It is regulated.

The tape wrapping portion 9 has a tape 18 wound thereon at a predetermined angle, and a plurality of annular grooves 20 are provided on the outer peripheral surface 19.

A pulley 21 is press-fitted into the lower end of the extending portion 10, and a belt 22 is hung around the pulley 21.

The other end of the belt 22 is guided to a drive source, and the tape guide section 8 is rotated by the rotational force of the drive source. As a driving source, a drum motor, capstan motor, reel motor, etc. are used. Note that the rotational force may be transmitted by a gear instead of the belt 22.

This rotational speed is determined by the tape winding speed of the tape guide section 8.
It is determined that the air film 23 is formed between the tape guide portion 8 and the tape 18 so that the outer peripheral speed vl of the tape I8 is faster than the running speed V of the tape I8.

To explain the principle of this air film 23 with reference to FIG. 2, when the tape winding part 9 of the tape guide part 8 rotates, the air near the outer circumferential surface 19 of the tape guide part 8 is transferred to this tape guide part. It moves with the rotation of 8. This moving air layer connects the tape guide section 8 and the tape 18.
An air film 23 is formed between the two.

In this embodiment, since a plurality of grooves 20 are formed in the outer circumferential surface 19 of the portion 9 for tape winding, air can be easily drawn in and the air film 23 can be easily formed.

Tape guide section 8 where this air film 23 is constructed
The outer circumferential speed V, is generally several tens of times the running speed (2) of the tape 18, and the direction of rotation is preferably the same as the running direction of the tape 18.

On the other hand, the upper flange 15 has a threaded hole 24 into which the threaded portion 6 of the support shaft 5 is screwed. As mentioned above, the boss portion 15a of the upper flange 15 is in contact with the upper ball bearing 13a, and the lower surface of the upper flange 15 is placed on the upper surface of the tape 18 at a very small distance from the upper surface of the portion 9. Directional displacement is regulated.

A flat-point screw 25 is screwed into the screw hole 24 from above, and the lower surface of the flat-point screw 25 abuts the upper surface of the support shaft 5 to prevent the upper flange 15 from loosening.

Also, the upper surface of the upper flange 15 is attached to the upper flange 15 using a tool.
A slit 26 is provided for rotating the.

The lower flange 27 is inserted into the extending portion 10, and the upper surface of the lower flange 27 is arranged at a small distance from the lower surface of the tape wrapping portion 9 to restrict downward displacement of the tape 18.

A ball bearing 13c is interposed between the lower flange 27 and the extension portion 10, so that the lower flange 27 does not rotate due to rotation of the tape guide portion 8.

Further, a spring 28 is arranged between the lower flange 27 and the sub-palm 3 to press the lower flange 27 upward.

To adjust the height of the tape guide part 8, for example, when displacing it downward, use a tool to move the upper flange 15 with the spring 17.
．． It rotates against the spring force of 28. Then, the upper flange 15. Tape guide part 8. Lower flange 27 and ball bearings 13a, 13b,
L3c is displaced downward. Finally, the flat screw 25 may be rotated until its lower surface abuts the upper surface of the support shaft 5. On the other hand, when displacing the tape guide section 8 upward, substantially the same operation as above may be performed.

The operation of the tape guide device will be explained below.

The pulley 21 is connected to the pulley 21 via the belt 22 from a drive source (not shown).
When rotational force is transmitted to the tape guide section 8, the tape guide section 8 rotates.

Then, due to the rotation of the tape guide section 8, an air film 23 is formed between the tape guide section 8 and the tape 18, and the tape 18 comes out of contact with the outer peripheral surface 19 of the tape guide section 8. When the tape 18 is run in this state, the running direction of the tape 18 can be changed without coming into contact with the outer peripheral surface 19 of the tape guide section 8.

In this embodiment, the outer circumferential surface 1 of the tape guide section 8
Since a plurality of grooves 20 are formed in the tape 9, the contact area between the tape 18 and the tape guide portion 8 is small when the tape is not running, and the initial sticking of the tape 18 can be prevented as much as possible.

[Effects of the Invention] As described above, according to the present invention, the tape guide section is rotated at high speed and an air film is formed between the tape guide section and the tape, so that the tape does not come into contact with the tape guide section. Damage to the magnetic surface of the tape caused by the tape running while contacting the tape guide section.One wrap of the tape is caused by an increase in running resistance due to an increase in angle, transmission of speed unevenness from the tape guide section, and damage to the tape magnetic surface due to the tape running while contacting the tape guide section. This has the effect of preventing the transmission of vibrations from the other parts.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention, FIG. 1 being a sectional view of a tape guide device, and FIG. 2 being a diagram showing a state in which an air film is constructed. 8... Tape guide section, 18... Tape, 19...
・Outer peripheral surface, 20...Groove, 23...Air film. 8--Table force, Id.

Claims (2)

[Claims] (1) In a tape guide device that guides the tape to a predetermined state by winding the tape around a tape guide part, the outer peripheral speed of the tape guide part is made faster than the running speed of the tape so that the outer peripheral surface of the tape guide part A tape guide device characterized in that an air film is formed between the tape and the tape. (2) The tape guide device according to claim 1, wherein a groove is provided on the outer peripheral surface of the tape guide portion.