JPH0250342A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To always perform satisfactory magnetic recording and reproduction, to simplify structure and to suppress a cost by pressurizing a separable air intake contact with a compressed air supplying part arranged at the downstream in the moving direction of a slider, and spraying compressed air on a tape. CONSTITUTION:On the slider 9, a compressed air spray part 1 that is a pressing force pressing part is arranged in parallel with a tape guide 12, and presses the tape 21 on a guide drum 25 side by a variable pressing force when the tape 21 is brought into contact with the circumference of the guide drum 25 by the tape guides 12 and 13. At the downstream in the moving direction of the slider 9, the compressed air supplying part 5 is arranged, and when the slider 9 is moved and the tape guide 12 is connected, an elastic tube opening 6 is pressurized contact with a supplying opening 5a, which forms a path communicated to an air flow path 9b'. Therefore, it is possible to adjust a tape floating quantity by pressing the tape on the drum side by spraying gas from the compressed air spray part 1. In such a way, magnetic recording and reproduction can be performed satisfactorily, and also, the cost can be suppressed by simplifying the structure.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an RDAT [rotary head di
gita audio tape recorder
The present invention relates to a magnetic recording and reproducing apparatus for performing magnetic recording and reproducing by scanning a magnetic head over a tape, such as the above.

[Conventional technology]

R-DAT and home VTR (video tape)
recorder--der), etc., as shown in Figure 4,
A rotary disk attached to a rotatable drum shaft (not shown) has a tape 3 attached thereto, which rotates with the drum shaft.
An upper guide drum 35a for guiding the magnetic heads 3 is disposed on the lower surface of the upper guide drum 35a.
These magnetic heads 34 and 34, which are attached at intervals of 1800 degrees, are set at the same height so as to form the same plane by the rotation of the above-mentioned rotary disk. - On the other hand, a lower guide drum (not shown) is provided below the rotating disk and faces the upper guide drum 35a with a drum shaft loosely inserted therethrough, and this lower guide drum and the upper guide drum 35a constitute one guide drum 35.

Tape guides 32 and 33 are located near the guide drum 35.
are provided at the inlet and outlet sides of the tape, respectively, and these tape guides 32 and 33 are arranged at the feeding position (not shown) of the tape 31 and the circumferential contact with the guide drum 35 in order to cause the tape 31 to circumferentially contact the guide drum 35. Taking the entrance side as an example, as shown in FIG. 3
2 are erected. A slider drive arm 37 is attached to the lower part of the slider 36, and a fifth
As shown in Figure (b), the slider drive arm 37 moves the slider 36 as necessary to place the tape 31 on the guide drum 35 at a circumferential position where the tape guide 32 is locked with the locking member 39. It will be surrounded.

Further, the tape 3 circumferentially circumferentially surrounds the guide drum 35.
1, the tape 3 is rotated by the upper guide drum 35a.
The magnetic heads 34 and 34 alternately scan over the recording medium 1 to perform recording and reproduction.

However, when recording or playing back, the guide drum 3
5 and the tape 31 surrounding the guide drum 35, the tape 31 floats on the surface of the guide drum 35, making it difficult for the magnetic heads 34 to come into contact with the tape 31, resulting in good magnetic recording. Playback becomes impossible. Especially tape 3
The tape 31 easily floats at the circumferential contact start point 31a, which is the position where the tape 1 begins to be circumferentially covered with the upper guide drum 35.
When the rotational speed of 5a is variable, the flying height of the tape 31 also changes depending on the rotational speed, and in response to this change,
It has been difficult to automatically adjust the amount of protrusion of the tape tensile system and the magnetic heads 34, 34, etc.

For this purpose, as shown in FIG. 6, a pressing force urging member is provided around the circumferential contact start point 31a of the tape 31 to the guide drum 35, which presses the tape 31 from the side toward the circumferential surface of the guide drum 35. As shown in FIG. a) ・(b
), the compressed air injection part 4 which is a pressing force urging part
1 is set upright on a movable slider 36 in line with the tape guide 32, and a compressed air supply section 42, which is a gas supply section, is attached to the compressed air injection section 41 from below the slider 36, and is moved by a slider drive arm 47. A magnetic recording/reproducing device is being considered.

[Problem to be solved by the invention]

However, in the above magnetic recording and reproducing device, in the case of FIG. 6, the driving system for rotating the pressing force urging section,
It is necessary to provide a control system associated with this drive system, and in the magnetic recording/reproducing apparatus shown in FIG. It is necessary to have a structure that can move together with the compressed air injection part 41, and both of the magnetic recording and reproducing apparatuses have disadvantages in that the structure becomes complicated and the cost increases.

[Means to solve the problem]

In order to solve the above-mentioned problems, the magnetic recording and reproducing apparatus of the present invention includes a guide drum for performing magnetic reproduction while circumferentially guiding a tape, and a guide drum for causing the tape to circumferentially surround and run the tape. a tape guide to guide the
A moving section in which the tape guide is installed vertically so as to be movable from the tape feeding position to the circumferential position on the guide drum; A magnetic recording/reproducing device comprising a pressing force urging unit that sprays gas to press the tape from the tape to the circumferential surface of the guide drum, and a gas supply unit supplying the above-mentioned gas to the pressing force urging unit. In the device, the pressing force urging section is provided in the moving section together with the tape guide,
When the tape guide is in the tape feeding position,
While the supply port of the pressing force biasing section is separated from the supply port of the gas supply section provided downstream in the moving direction of the moving section, when it is positioned in circumferential position to the guide drum, the The present invention is characterized in that the supply port is brought into pressure contact with the supply port by movement of the part, and the gas supply part is communicated with the pressing force urging part.

[For production]

According to the above configuration, in the vicinity of the position where the tape starts to be circumferentially wrapped around the guide drum, gas is blown from the side pressure urging section to press the tape against the guide drum side, thereby achieving good magnetic recording and reproduction. It becomes possible to adjust the flying height of the tape, and good magnetic recording and reproduction can always be performed.

Furthermore, it is no longer necessary to rotate the pressing force urging section or to move the gas supply section together with the pressing force urging section, making it possible to simplify the structure and reduce costs.

[Example 1] An example of the present invention will be described below based on FIGS. 1 and 2.

A case will be described in which this embodiment is applied to a magnetic recording/reproducing device for a VTR. As shown in FIG. 2, the guide drum 25 in the magnetic recording/reproducing device has a rotating disk attached to a rotatable drum shaft (not shown), and a tape 21 that rotates with the rotating disk is mounted on the upper part of the rotating disk. An upper guide drum 25a is provided for guiding the. The lower surface of the upper guide drum 25a has two
magnetic heads 24, 24 are installed at 180° intervals, and these magnetic heads 24, 24 are set at the same height so as to form the same plane by the rotation of the upper guide drum 25a. .

On the other hand, a lower guide drum (not shown) is provided below the rotating disk and faces the upper guide drum 25a with the drum shaft loosely inserted therethrough. One guide drum 25
is configured.

When the tape 21 is wrapped around the guide drum 25, tape guides 12 and 13 are provided on the entrance and exit sides of the tape 21 to the guide drum 25. In order to bring the guide drums 21 into contact with the circumferential surface of the guide drum 25, they are respectively moved on the sides of the guide drum side 5. When looking at the entrance side of the tape 21, the tape guide 12 is erected on the slider 9, which is composed of an upper slider 9a and a lower slider 9b as shown in FIG. 1(a).
The upper slider 9a and the lower slider 9b are connected to the rail 8.
・It is movably provided by sandwiching 8 from above and below. Further, a slider drive arm 7 is attached to the lower surface of the lower slider 9b for transmitting a driving force from a drive system (not shown) to move the slider on the rails 8, and a tape guide 12 is used to feed the tape 21. From this position, the slider 9 moves in the direction of the arrow 6, which corresponds to the downstream direction of movement, as shown in FIG. 1(b).
As shown in FIG.
The tape 21 is placed in contact with the circumferential surface of 5.

Further, on the slider 9, a compressed air injection unit 1, which is a pressing force urging unit, is arranged in line with the tape guide 12, and the tape 21 is circumferentially attached to the guide drum 25 by the tape guides 12 and 13. When the guide drum 2 of the tape 21
It is located on the side near the circumferential contact start point 21a with respect to the guide drum 25, and blows compressed air, which is a gas, onto the tape 21 in order to press the tape 21 against the guide drum 25 side with a variable pressing force.

The compressed air injection section 1 passes through the upper slider 9a and is fitted into the lower slider 9b, and the compressed air injection section 1 has an ejection port 1a on the circumferential surface for ejecting compressed air. ... are formed, and an air flow passage 1b is formed inside. An air flow passage 9b' is formed inside the lower slider 9b, and one end of this air flow passage 9b' communicates with the air flow passage 1b, while the slider 9 is moved. An air intake port 9b', which is a supplied port for taking in compressed air, is formed on the other end side downstream in the direction, and this air intake port 9b'' is further provided with an elastic tube port 6 made of rubber.
is installed.

Further, a compressed air supply section 5 serving as a gas supply section is disposed downstream of the slider 9 in the moving direction.
moves and the tape guide 12 is locked by the locking member 11, the elastic tube port 6 is brought into pressure contact with the supply port 5a of the compressed air supply section 5, and the compressed air supply section 5 and It is in communication with the air flow passage 9b'.

In this embodiment, the elastic body tube port 6 is attached to the air intake port 9b'', but this may be one in which the compressed air supply part 5 is pressed into contact with the air intake port 9b'' itself, or the elastic body tube port 6 is attached to the air intake port 9b''.
When using a material other than rubber, it is sufficient that the material has adhesion and durability when the compressed air supply section 5 is pressed into contact with the material.
For example, it may be made of plastic.

In the above configuration, when recording and reproducing, the tape guides 12 and 13 move in the direction of arrow A.
After the tape 21 is circumferentially wrapped around the guide drum 25, it is conveyed with the rotation of the upper guide drum 25a, and
While a rotates, the magnetic heads 24 are alternately switched to scan the tape 21 for recording and reproduction.

Here, when the tape guides 12 and 13 move from the feeding position of the tape 21 to the circumferential position to the guide drum 25, the compressed air injection part 1 is located to the side of the circumferential contact start point 21a, and the The elastic tube port 6 is pressed and compressed air is supplied. The supplied compressed air is passed through the air flow path 9
b' ・Tape 2 from injection port 1a... through 1b
1, and the guide drum 25
It is set so that an optimum tape flying height can be obtained for the upper tape 21.

In this way, the setting is made such that the compressed air jetted from the compressed air jetting section 1 can always obtain the optimal tape flying height, and the compressed air supplying section 5 disposed downstream in the moving direction of the slider 9 is On the other hand, if compressed air is supplied by pressing the air intake port 9b'' which is provided so that it can be moved into and out of contact with the tape 21, the compressed air is
It is possible to always perform good magnetic recording and reproducing by blowing compressed air into the compressed air. Movement of the injection unit 1 and supply port 5a
Since the pressure contact between the elastic body tube port 6 and the elastic body tube port 6 is performed by the movement of the slider 9, the structure is simplified and costs can be reduced.

[Embodiment 2] Another embodiment of the present invention will be described below with reference to FIG.

Note that members having the same functions as those in the first embodiment described above are denoted by the same reference numerals, and their explanations will be omitted.

Generally, when running a tape at high speed, if a rotating post that rotates as the tape runs is used as a tape guide, the rotational vibration of the rotating post is transmitted to the tape, which tends to cause wow and flutter. When a fixed post is used, the tape is wrapped around the tape guide depending on the angle at which the tape is wound, which increases the friction between the tape guide and the tape, which tends to cause tape squeal or abnormal tape tension.

In this embodiment, as shown in FIG.
At the same time, an air flow passage 12'a is formed inside a tape guide 12' erected on the upper slider 9a.
A jet port 12'b for jetting compressed air from the air flow passage 12'a onto the circumferential surface of the tape guide 12'...
is provided. Further, the tape guide 12' passes through the upper slider 9a and is fitted into the lower slider 9b, and the air flow passage 12'b passes through the upper slider 9a.
It communicates with an airflow passage 9b' formed inside b.

In the above configuration, when recording and reproducing are performed, the elastic tube port 6 is brought into pressure contact with the supply port 5a of the compressed air supply section 5, compressed air is supplied, and this compressed air is supplied to the air flow passage 9b'/i.
b・12′ a Through the injection port 1a...12′ b
..., so that the tape on the guide drum can always obtain the optimal tape floating height, and by interposing air between the tape guide 12' and the tape, vibrations and Since friction can be reduced, the above-mentioned wow and flutter, tape squeal, abnormal tape tension, etc. that tend to occur when the tape is run at high speed can be eliminated, and even better magnetic recording and reproduction can be performed.

〔Effect of the invention〕

As described above, the magnetic recording and reproducing apparatus according to the present invention includes a guide drum for performing magnetic reproduction while circumferentially guiding a tape, and a guide drum that circumferentially circumferentially guides the tape to guide the tape. a tape guide for the tape guide, a moving part in which the tape guide is erected and is movable between the tape feeding position and the circumferential position on the guide drum; a pressing force urging section that sprays gas near the starting point to press the tape from the side toward the circumferential surface of the guide drum; and a gas supply section that supplies the above-mentioned gas to the pressing force urging section. In the magnetic recording and reproducing apparatus, the pressing force urging section is provided in the moving section together with the tape guide, and when the tape guide is located at the tape feeding position, the feeding port of the pressing force urging section is provided. is separated from the supply port of the gas supply section provided downstream in the direction of movement of the moving section, while when it is positioned in circumferential position to the guide drum, the above-mentioned supply port is opened by the movement of the moving section. The gas supply section is configured to be brought into pressure contact with the supply port to communicate the gas supply section with the pressing force urging section.

This has the effect that the tape flying height can be maintained at an optimum level and good magnetic recording and reproduction can be performed, and that the structure can be simplified and costs can be suppressed.

[Brief explanation of the drawing]

FIGS. 1 and 2 show one embodiment of the present invention, and FIG. b) is a plan view showing the structure of the compressed air injection section erected together with the tape guide, and FIG. 2 is a plan view showing the compressed air injection section arranged near the rotating drum. FIG. 3 shows another embodiment of the present invention, and is an explanatory cross-sectional view showing the structure of a tape guide and a compressed air injection section. 4 to 7 show a conventional example, in which FIG. 4 is a plan view showing the arrangement near the rotating drum, and FIG. 5(a) is an explanatory diagram showing the structure of an upright tape guide. , the same figure (b
) is a plan view showing the structure of an upright tape guide;
The figure is a plan view showing the arrangement of the compressed air jetting part that is movable around the rotating drum, FIG. 7(a) is an explanatory diagram showing the structure of the tape guide and the compressed air jetting part, b)
is its plan view. l is compressed air injection part (pressing force urging part), 1a/12'
b is a blowout port, 1b, 9b', 12'a is an air flow path, 5 is a compressed air supply part (gas supply part), 5a is a supply port,
6 is an elastic tube port, 7 is a slider drive arm, 8 is a rail, 9 is a slider, 9a is an upper slider, 9b is a lower slider, 9b' is an air intake port (supplied port), 11 is an engaging member, 12・12' ・13 is a tape guide, 21 is a tape, 21a is a circumferential contact starting point, 24 is a magnetic head, 25 is a guide drum, and 25a is an upper guide drum. Figure (a) Happy figure (b) Shizu-A Figure 5 (a) Figure (b) Happy figure 6

Claims (1)

[Scope of Claims] 1. A guide drum for performing magnetic reproduction while guiding the tape circumferentially; a tape guide for guiding the tape by circumferentially guiding the tape around the guide drum; a moving section in which a tape guide is provided so as to be movable between the tape feeding position and the circumferential position on the guide drum; In a magnetic recording and reproducing device comprising a pressing force urging section that sprays gas to press a tape against the circumferential surface of a guide drum, and a gas supply section supplying the above-mentioned gas to the pressing force urging section. , When the pressing force biasing section is provided in the moving section together with the tape guide, and the tape guide is located at the tape feeding position, the supply port of the pressing force biasing section is located downstream in the moving direction of the moving section. While it is separated from the supply port of the provided gas supply section, when it is positioned in circumferential position to the guide drum, the above-mentioned supply port is pressed against the supply port by the movement of the moving section, and the above-mentioned press A magnetic recording/reproducing device characterized in that the pressure urging section is configured to communicate with a gas supply section.