JP2837966B2 - Tape running mechanism - 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 running mechanism such as a video tape recorder and a digital audio tape recorder.

[0002]

2. Description of the Related Art FIG. 5 is a plan view showing a tape running system of a conventional video tape recorder, and FIG.
It is a perspective view of the tape guide roller shown by 5348 gazettes. In FIG. 5, reference numeral 1 denotes a tape cassette for accommodating the magnetic tape 2, and 3 denotes a supply reel hub which winds and holds the magnetic tape 2 and supplies the magnetic tape 2 to the outside of the tape cassette 1 during recording and reproduction. And is arranged coaxially with the drive reel 29 to be driven. Reference numerals 4 and 17 are tape guide pins incorporated in the tape cassette.
6, 8, 12 and 14 are tape guide rollers whose details are shown in FIG. Reference numerals 9 and 11 denote slant pins. Reference numeral 10 denotes a rotary cylinder that records a signal on the magnetic tape 2 or reproduces a signal recorded on the magnetic tape 2. Reference numeral 7 denotes an erasing head, and reference numeral 13 denotes a voice / control head. Reference numeral 15 denotes a capstan shaft, and the pinch roller 1
6, the magnetic tape 2 is pressed against the magnetic tape 2, and the driving force is transmitted to the magnetic tape 2 by the frictional force with the magnetic tape 2 with the rotation of the capstan shaft 15 connected to the driving source. Reference numeral 18 denotes a take-up reel hub that winds and holds the magnetic tape 2 and stores the magnetic tape 2 in the tape cassette 1 during recording and reproduction, and is coaxially connected to a drive reel 19 that drives the take-up reel hub. A spring 26 whose other end is fixed and supported by a fixing member 28 is attached to the tension arm 24, and is arranged so as to always apply a biasing force to the tension arm 24 in a counterclockwise direction around the rotation support shaft 27. ing. Further, the other end of the brake belt 21 having the other end fixed by the fixing member 22 is also attached to the tension arm 24, and the tension pin 25 changes according to the tape tension received from the magnetic tape 2 by the tension pin 25. The reel drive shaft 2 on the tape supply side via the brake pad 23 corresponding to the rotation position
These are arranged to give the braking force to 9.

In FIG. 6, reference numeral 40 denotes a roller, which is rotatably supported around a central axis 44. Guide flanges 41 and 42 are fixed to the upper and lower ends of the shaft 44, and the magnetic tape 2 is supported between the upper and lower guide flanges 41 and 42 while sliding with the roller 40. I have. A screw portion 43 is provided below the lower guide flange, and is attached to a deck base (not shown) via this member.

Next, the operation of the above configuration will be described.
As shown in FIG. 5, the magnetic tape 2 coming out of the supply-side reel hub 3 is supported by a plurality of guide pins, and is recorded or reproduced by the rotary cylinder 10, and is taken up by the take-up-side reel hub 1.
8 At this time, the magnetic tape 2 is stably moved along the tape running system, and the magnetic head (not shown) attached to the rotary cylinder 10 is stably contacted with the magnetic tape 2 so that the magnetic tape 2 is stably contacted. The tape 2 is run while always applying a back tension to the tape 2 to regulate the position of the magnetic tape 2 in the tape width direction.

The position of the magnetic tape 2 in the tape width direction is regulated by sandwiching the magnetic tape 2 between an upper flange 41 and a lower flange 42 provided on the guide rollers 6, 8, 12, and 14, respectively.
When an external force acts on the magnetic tape 2 to cause displacement in the tape width direction, the upper flange 41 or the lower flange 42 comes into contact with the edge of the magnetic tape 2 to restrict displacement of the tape edge. . The height adjustment of the upper flange 41 and the lower flange 42 with respect to the deck base (not shown) in the tape width direction is performed by adjusting the length of the guide roller screw portion 43 pressed into the deck base in advance.

[0006]

In the conventional tape running mechanism constructed as described above, the positioning of the magnetic tape in the width direction is mechanically and forcibly restricted by upper and lower flanges provided on the guide roller. However, since the restricting force acts on the edge of the magnetic tape, the edge of the magnetic tape is liable to be damaged. As described above, when a tape having low rigidity is used, there is a problem that damage is particularly likely to occur at an edge portion and the magnetic tape does not run stably. Since the upper and lower flanges are fixed to the center axis of the guide roller, when the guide roller height in the tape width direction is determined, the height of the flange is also uniquely determined. Therefore, the height of the guide roller relative to the deck base needs to be precisely adjusted in advance.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to restrict the position of a magnetic tape in the width direction without mechanically and forcibly restricting the edge of the magnetic tape. It is another object of the present invention to provide a tape traveling mechanism that can perform the assembly adjustment of the magnetic tape traveling supporting member easily.

[0008]

A tape running mechanism according to a first aspect of the present invention is a tape running support member disposed in a tape running path along which a magnetic tape runs. tape running with and the member that slides, a sensor for detecting the height position of the tape width direction relative to the sliding member of the magnetic tape, and a mechanism for controlling the height position of the width direction before Symbol magnetic tape Mechanism
And a mechanism for controlling the height position of the magnetic tape in the width direction.
Is provided on the surface of the sliding member and the magnetic tape
A contacting electrode and a device for applying positive and negative charges to this electrode
And adjusting the positive and negative charges given to the electrode to
Changing the electrostatic attraction force between the air tape and the electrode
Controlling the height of the magnetic tape in the width direction.
It is characterized by the following.

Further, the tape running according to claim 2 of the present invention.
The row mechanism includes a positive electrode provided with the positive charge and the negative electrode.
And negative electrodes to which electric charges are applied are alternately arranged in a comb shape .

[0010]

According to the first aspect of the present invention, there is provided the tape running apparatus as described above.
In the mechanism, the positive and negative electrodes are
When a load is applied, the magnetic tape
Polarized inside and emitted in the electrode on the sliding member and in the magnetic tape
The magnetic tape is attracted to the member by the attractive force generated by the different poles
Slide. This adsorption force changes depending on the amount of charge added.
Therefore, the amount of charge to be added when the magnetic tape is running
When the tape is changed in the width direction, the magnetic tape
Change in direction. At this time, the force acting on the magnetic tape is
The magnetic tape will change in its width direction due to imbalance.
It will run while standing.

Also, in the present invention, the combs are alternately formed.
Adjust the charge applied to the positive and negative electrodes
Changing the electrostatic attraction force between the air tape and each electrode
As a result, the height of the magnetic tape in the width direction is obtained.
The position is controlled.

[0012]

[Embodiment 1] FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG. 2 is a developed view of an electrode pattern portion sliding with a magnetic tape in FIG. In the figure, the same or corresponding members as those of the above-described conventional device are denoted by the same reference numerals, and description thereof is omitted. Reference numeral 30 denotes a tape running support member, the cylindrical side surface of which contacts and slides with the magnetic tape 2 to support the magnetic tape 2. This member is fixed to a central shaft 44,
4 is attached to a deck base (not shown) by the screw portion 43 fixed to the base 4. Electrodes are arranged on the side surface of the tape running support member 30, and the first electrode 31, the second electrode 32, and the third electrode 33 are alternately arranged in a comb shape as shown in detail in FIG. Each electrode is connected to a power source (not shown) via connection terminals 34, 35, and 36. Reference numerals 37 and 38 denote position sensors using light, which detect the positions of the edge portions of the magnetic tape 2 indicated by broken lines in FIG.

Next, the operation will be described. In the tape running mechanism configured as described above, the first electrode 31 and the second electrode 32 have the same polarity on the electrodes provided on the surface of the tape running support member 30 that slides in contact with the magnetic tape 2. Third
When the positive and negative charges are applied to the electrodes having different polarities, the electrode 3
The inside of the magnetic tape 2 is polarized according to the polarities of 1, 32 and 33. FIG. 3 is a cross-sectional view of the contact portion between the magnetic tape 2 and the first electrode 31 and the third electrode 33, showing the state. The electrodes shown in FIG. It is a cross section. In FIG. 3, inside the magnetic tape 2 near the first electrode 31 having a positive charge,
The negative electrode 46 is concentrated, and the third electrode 3 having a negative charge
Positive charges 47 are concentrated inside the magnetic tape 2 close to 3. At this time, the first electrode 31 on the support member 30 and the third electrode 31
The magnetic tape 2 is attracted to and slides on the support member 30 by the electrodes 33 and the attracting force of the different polarities of the static electricity generated in the magnetic tape 2. Similarly, a second electrode 32, a third electrode 33,
Even between the magnetic tapes 2, a suction force between different poles due to static electricity is generated, and the magnetic tape 2 slides by suction with the support member 30. Since the magnetic tape 2 slides on the surface of the support member 30 as described above, the kinetic frictional force due to the sliding acts on the magnetic tape 2 as back tension, but the sliding strength differs in the width direction of the tape. Then, a moment acts in the in-plane direction of the magnetic tape 2, and the magnetic tape 2 travels while being displaced in the width direction. That is, when the upper end of the magnetic tape 2 slides strongly, the magnetic tape 2 is displaced to the upper side 51 in the tape width direction, and when the lower end is strongly slid, the magnetic tape 2 is displaced to the lower side 52 in the tape width direction.

The electrostatic attraction force increases as the potential difference between the adjacent positive and negative electrodes increases. That is, the attraction force changes according to the added potential difference.
When the potential difference to be applied in the tape width direction is changed at the time of traveling, the attraction force of the magnetic tape 2 changes in the width direction.
The magnetic tape 2 travels while being displaced in the width direction. In the present embodiment, the third electrode 33 is used as a common pole, and the first electrode 31 disposed at a position facing the lower part of the magnetic tape 2 and the second electrode 31 disposed at a position facing the upper part of the magnetic tape 2. The magnetic tape 2 is divided into upper and lower regions in the width direction of the magnetic tape 2 so as to correspond to each other, and the potential difference between the potential applied to the first electrode 31 and the potential applied to the second electrode 32 is determined. By imbalance, the magnetic tape 2 is displaced to the upper side 51 or the lower side 52 in the tape width direction. Position regulation in the tape width direction is performed by the position sensor 3
By constantly monitoring the edge portion of the magnetic tape 2 by 7 and 38 and detecting the amount of deviation from the reference position,
The first electrode 31 and the second electrode 32
This is made possible by changing the potential difference between them.

Embodiment 2 FIG. In the first embodiment, of the first electrode 31, the second electrode 32, and the third electrode 33 sliding on the magnetic tape 2, the electrodes having positive and negative charges are arranged so as to be orthogonal to the running direction 58 of the magnetic tape 2. Although the electrode pattern is arranged in FIG. 4, it may be arranged as shown in FIG. FIG. 4 shows the comb-shaped electrodes shown in the first embodiment arranged in the running direction 58 of the magnetic tape 2. Also in this embodiment, an electrostatic attraction force between the first electrode 31, the second electrode 32, the third electrode 33 and the magnetic tape 2 is generated,
An effect equivalent to that described above is shown.

[0016]

As described above , according to the tape running mechanism of the present invention, the magnetic tape provided on the surface of the sliding member is provided.
And a device that provides positive and negative charges to this electrode.
To adjust the positive and negative charges given to the electrode
Change the electrostatic attraction force between the magnetic tape and the electrode
By controlling the height position in the width direction of the magnetic tape
The mechanism for controlling the width of the magnetic tape can be regulated without mechanically and forcibly regulating the edge of the magnetic tape, and the assembly and adjustment of the magnetic tape traveling support member is easy. There is an effect that a tape running mechanism can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a developed view showing an electrode pattern portion according to the first embodiment of the present invention.

FIG. 3 is a sectional view showing a contact portion between a magnetic tape and an electrode according to the first embodiment of the present invention.

FIG. 4 is a developed view showing an electrode pattern portion according to a second embodiment of the present invention.

FIG. 5 is a plan view showing a traveling system of a conventional video tape recorder tape.

FIG. 6 is a perspective view of a conventional tape guide roller.

[Explanation of symbols]

 2 Magnetic Tape 30 Tape Travel Supporting Member 31 First Electrode 32 Second Electrode 33 Third Electrode 37 Position Sensor 38 Position Sensor

Claims (2)

(57) [Claims] 1. A tape running support member disposed in a tape running path along which a magnetic tape runs, a member supported by a base and sliding with the magnetic tape, and a tape for sliding the magnetic tape with respect to the sliding member. a sensor for detecting the height position of the width direction, before Symbol a tape running mechanism and a mechanism for controlling the height position of the width direction of the magnetic tape, controls the height position of the width direction of said magnetic tape A mechanism for contacting the magnetic tape is provided on the surface of the sliding member.
And a device for applying positive and negative charges to this electrode.
And adjusting the positive and negative charges applied to the electrodes to adjust the magnetic tape
By changing the electrostatic attraction force between the
A tape running mechanism for controlling a height position of the magnetic tape in a width direction . 2. The method according to claim 2, wherein the positive electrode provided with the positive charge and
2. The tape running mechanism according to claim 1, wherein the negative electrodes to which a negative charge is applied are alternately arranged in a comb shape.