JPH117677A - Magnetic recording reproducer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic recording reproducer interchangeable with other magnetic recording reprocucer regarding recording reproducing operation. SOLUTION: At the time of completion of loading operation, the driving gear 22 of power transmission system in the height control mechanism positioned on the fixing side of the machine body is interlocked with the driven gear 7g of height control mechanism positioned on the loading pole PB side. A light shielding plate 13 for the position sensor PS on the guide pole PG, the height of which varies according to the rotation of driven gear 7g, is fixed, and a photo-interrupter 24 of position sensor PS which generates position detecting signal by detecting the state of turning displacement of light shielding plate 13 is provided on the fixing part of the machine body. Thus, by the automatic control of the height of guide pole GP through the automatic control operation of a turn of closed loop based on the output signal of position sensor PS or the output signal of rotary encorder RE, bending correction is executed to obtain a faborable regeneration signal, and at the same time by applying the data obtained at the time of regeneration of standard tape the interchangeability of recording reproducing operation with the other magnetic recording reproducer is secured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic recording / reproducing apparatus,
In particular, a magnetic coil wound around a part of the drum peripheral surface by a rotating magnetic head provided so that a rotational trajectory surface is formed at a predetermined position with respect to a fixed portion of the body of the magnetic recording / reproducing apparatus. Recording and playback operations are performed on the tape,
The magnetic tape to be wound around a part of the drum peripheral surface is provided on a pole base of a loading mechanism that is individually disposed in a traveling path between a winding start side and a winding end side of the drum peripheral surface. The height of the first and second guide poles
The first method described above obtained based on a reproduction signal from a magnetic tape.
The rotation magnetic field is changed by a height control signal generated using the bending information of the recording trace at the position near the guide pole and the bending information of the recording trace at the position near the second guide pole. A position sensor and a rotary encoder for generating information on the height of the guide pole and a fixed portion of the body of the magnetic recording / reproducing apparatus so that a closed loop automatic control operation for aligning the recording trace of the magnetic tape with the rotation locus of the head is performed. The present invention relates to a magnetic recording / reproducing apparatus having a height control mechanism including a driving source and a power transmission mechanism.

[0002]

2. Description of the Related Art A magnetic tape wound around a part of a peripheral surface of a drum is run at a predetermined running speed, and a specific recording trace pattern (track pattern) corresponding to the rotation locus of a rotary magnetic head is obtained. ) Is formed on a magnetic tape to perform a recording / reproducing operation, and is widely used as a video tape recorder (VTR) or a video cassette recorder (VCR). The above-mentioned track pattern has a specific format for each magnetic recording / reproducing method employed in the magnetic recording / reproducing apparatus, but is formed to operate according to the same magnetic recording / reproducing method. Even if the magnetic recording / reproducing device of the same standard exists, due to the variation due to the existence of the allowable manufacturing error, and other causes,
Generally, the track patterns formed on the magnetic tape corresponding to the rotation locus of the rotary magnetic head for each magnetic recording / reproducing device are different from each other.

[0003] For the above-mentioned reasons, the track pattern formed on the magnetic tape is different for each magnetic recording / reproducing device. Therefore, the recorded magnetic tape recorded by the magnetic recording / reproducing device is used for recording. When recording / reproducing is performed by a magnetic recording / reproducing apparatus other than the magnetic recording / reproducing apparatus (during compatible recording / reproducing operation), good reproducing operation may not be performed. In particular, when a track pattern is formed by recording traces having a narrow recording trace width (track width) for high-density recording, serious trouble may occur during the compatible recording / reproducing operation.

For example, in recent years, by recording three recording traces having a recording trace width of 19 μm on a magnetic tape T simultaneously in parallel, it has become possible to record and reproduce so-called high-vision image information. New form of VTR
(A so-called W-VHS VTR) has been proposed. In the above-described VTR of the new type, two adjacent recording marks among three recording marks formed in parallel on the magnetic tape T at the same time. Are used for recording / reproducing a video signal by two rotating magnetic heads having azimuth angles in opposite directions, and the remaining one recording trace is used for recording an acoustic signal by another rotating magnetic head. Used for reproduction,
The after-recording is also made possible by the rotary magnetic head for recording and reproducing the acoustic signal.

[0005] Incidentally, since the allowable value of the bending in one recording mark in the above-mentioned VTR is set to about 7 μm, for example, when after-recording is performed by the compatible recording / reproducing operation, the recorded magnetic tape is not recorded. A maximum of 1 between the recording trace and the rotation locus of the rotating magnetic head
A shift of about 4 μm may occur. So now,
Considering the case where the displacement of 14 μm occurs between the recording trace of the recorded magnetic tape and the rotation locus of the rotary magnetic head as described above, in the above case, the recording trace of the acoustic signal on the recorded magnetic tape is considered. The rotary magnetic head for recording and reproducing the audio signal to be subjected to the after-recording is shifted from the recording track for recording the audio signal on the recorded magnetic tape by 14 μm toward the recording track for recording the video signal adjacent thereto. In addition, a portion having a width of 14 μm in a recording trace for recording a video signal having a recording trace width of 19 μm is overwritten by an audio signal for after recording, and as a recording portion of an original video signal, Only the portion having a width of 5 μm is left, and the quality of the reproduced video signal is degraded.

In order to solve the above-mentioned problems, it is only necessary to match the rotation trajectory of the rotary magnetic head with the recording trace of the magnetic tape T. Conventionally, in the open loop control circuit or the closed loop control circuit, The rotating magnetic head is tracked to the recording trace of the magnetic head by being driven and displaced by a magnetic head driving device configured using an electro-mechanical conversion element (for example, a voice coil motor, a bimorph of an electrostrictive element) used as an actuator. Let them do it. For example, as disclosed in Japanese Utility Model Publication No. 63-34126 and Japanese Utility Model Application Publication No. Sho 61-158633, the rotating drum on which the rotating magnetic head is mounted and the lower drum are integrally tilted so that the rotating head becomes magnetic. The recording trace of the tape T can be tracked. For example, as disclosed in Japanese Patent Application Laid-Open No. 60-115043, the height of the guide pole is changed by the stacked piezoelectric elements.
For example, as disclosed in Japanese Utility Model Laid-Open Publication No. 61-153151, a gear is fixed to a shaft of a guide pole having a thread portion, and the gear is rotated by a motor to change the height of the guide pole. Various solutions have been proposed.

However, since about two rotary magnetic heads can be mounted on a single magnetic head drive device having a small size, it is used, for example, for recording and reproducing acoustic signals by a so-called deep recording method. In addition, it is difficult to mount an audio head on the magnetic head drive device, and the magnetic head drive device is very expensive. Is difficult to use for consumer VTRs where
Further, the rotating head and the lower drum are integrally tilted as in the above-described solution, and the rotating head is moved by the magnetic tape T.
The magnetic recording / reproducing apparatus which is capable of tracking the recording trace of the magnetic recording / reproducing apparatus has a drawback that a large driving force is required to incline a member having a large mass. It is not practical because a displacement of only a few microns can be obtained with a drive voltage of 100 volts, and it is extremely difficult to provide a motor or gear on a pole base that is moved at the time of loading operation. There was a problem.

[0008] The applicant's company has proposed a magnetic recording / reproducing apparatus as disclosed in Japanese Patent Application Laid-Open No. 7-57351, ie, a magnetic recording / reproducing apparatus, which does not cause the above-mentioned problems in the conventional apparatus. Recording and recording on a magnetic tape wound around a part of the drum peripheral surface by a rotary magnetic head provided so that a rotational trajectory surface is formed at a predetermined position with respect to a fixed portion of the body of the reproducing apparatus. A reproducing operation is performed, and the magnetic tape to be wound around a part of the drum peripheral surface is separately provided on a traveling path between a winding start side and a winding end side around the drum peripheral surface. A screw provided on the shaft of the guide pole is screwed into a screw hole threaded on the pole base of the loading mechanism to be disposed, and the structure integrated with the lower flange of the guide pole is formed. The height of the guide pole can be changed when a rotational force is transmitted to a gear of the magnetic recording / reproducing apparatus from a driving source provided in a fixed portion of the magnetic recording / reproducing apparatus via a power transmission system using the gear. The first,
When the height of the second guide pole is determined based on the reproduction signal from the magnetic tape, the bending information of the recording trace at the position near the first guide pole and the bending information of the recording trace at the position near the second guide pole are obtained. A position sensor and a rotary encoder that can be changed by a height control signal generated using the bending information of the recording trace and generate information regarding the height of the guide pole, and fixing of the body of the magnetic recording and reproducing apparatus A single closed loop automatic control system including a drive source and a power transmission mechanism provided in the unit operates so as to match the recording trace of the magnetic tape with the rotation locus of the rotary magnetic head. Has proposed a magnetic recording / reproducing apparatus provided with a height control mechanism. In the magnetic recording / reproducing device already proposed by the present applicant, the state in which the light shielding plate in the position sensor constituted by the light shielding plate and the photo interrupter shows a specific rotation phase indicates the state of the guide pole. It is made to correspond to the reference position (reference height position), and the difference between the height of the guide pole and the reference height position, that is, the difference between the upper and lower positions is detected. When the guide pole is in the reference position, the counting is performed based on the difference between the count value of the pulse from the rotary encoder and the count value counted by the counter.

According to the magnetic recording / reproducing device proposed by the present applicant company, even if the recording mark recorded on the recorded magnetic tape to be reproduced is bent, it can be detected based on the reproduced signal. The automatic control operation of a closed loop performed using the bending information of the generated recording trace enables the height of the guide poles individually arranged in the traveling path between the winding start side and the winding end side around the drum peripheral surface. Is changed by a closed loop automatic control system,
Since the recording trace is made to coincide with the rotation trajectory of the rotary magnetic head, it is possible to satisfactorily reproduce even a recorded magnetic tape recorded by another magnetic recording and reproducing device. FIG. 22 is a diagram for explaining the operation principle of the magnetic recording / reproducing apparatus already proposed by the applicant company. In FIG. 22C, Du denotes an upper drum, Dd denotes a lower drum, DB denotes a drum base, and PB1 and PB2 denote pole bases provided in a loading mechanism.

The pole base PB1 is provided with a guide pole GP1 and an inclined pole SP1, and the pole base PB2 is provided with a guide pole GP2 and an inclined pole SP2. The guide poles GP1 and GP2 are displaceable in the vertical direction with respect to the pole bases PB1 and PB2 on which the guide poles GP1 and GP2 are provided. In a state where the loading operation by the loading mechanism is completed, the guide pole GP1 is set at a predetermined position on the drum start side on the drum peripheral surface, and the guide pole GP1 is positioned at a predetermined end position on the drum peripheral surface. Installed in

FIG. 22A is a top view of the vicinity of the upper drum in a state where the loading operation by the loading mechanism has been completed. Now, as shown in FIG. 22 (a), the recorded magnetic tape T is wound around an angle range slightly over 180 degrees (center angle of the drum) on the peripheral surfaces of the upper and lower drums. When the reproducing operation is performed by running, the recorded magnetic tape T is in a state where there is no bend in the sequential recording marks recorded on the magnetic tape T (for example, an alignment tape ... a standard tape for adjustment). In addition, the guide pole GP1 is installed at a predetermined position on the drum peripheral surface at the start of winding, and is installed at a predetermined position on the drum peripheral surface at the end of winding. When the height position of the guide pole GP2 coincides with the reference height position, the envelope of the frequency modulated wave signal reproduced from the rotating magnetic head H has a substantially rectangular shape.

However, the height of the guide pole GP1 provided at a predetermined position on the winding start side on the drum peripheral surface and the guide pole provided at a predetermined position on the winding end side on the drum peripheral surface are set. If the height position of the GP2 is deviated from the reference height position, the recorded magnetic tape to be reproduced is sequentially recorded on the magnetic tape as described above. Even if there is no bend in the envelope, the envelope of the frequency-modulated wave signal reproduced from the rotating magnetic head is in a state where the height positions of the guide poles GP1 and GP2 deviate from the normal height positions. , For example, as shown in FIG. 22B.

If the recording mark formed on the recorded magnetic tape T has a bend, as illustrated in FIG. The height position of the guide pole GP1 installed at a predetermined position on the winding start side and the height position of the guide pole GP2 installed at a predetermined position on the winding end side around the drum peripheral surface are defined as a reference. If the height matches the
The envelope of the frequency modulated wave signal reproduced from the rotating magnetic head H is in a state of changing in a wave shape as illustrated in FIG.

From the above description, it is possible to obtain information on the bending near the both ends of the recording trace in correspondence with the change state of the envelope of the frequency modulated signal reproduced from the recorded magnetic tape T to be reproduced. Then, a height control signal for each guide pole is generated based thereon, and a closed loop automatic control system is performed so that the envelope of the frequency modulated signal reproduced from the rotating magnetic head becomes rectangular over the entire recording trace. By controlling the height of each guide pole by the above operation, it can be seen that the recording trace of the magnetic tape can be adjusted to the rotation locus of the rotating magnetic head. Therefore, in the magnetic recording / reproducing apparatus proposed by the present applicant, in the state where the above-described loading operation is completed, the guide poles GP1 and GP2 are provided on the fixing portion of the body of the magnetic recording / reproducing apparatus (not shown). Operation of a closed-loop automatic control system based on a height control signal generated by using the information on the bending of the recording trace by engaging with a height control mechanism configured to include a driving source and a power transmission mechanism. Thus, the drive position is changed so as to change the height position, so that the recording trace of the magnetic tape matches the rotation locus of the rotary magnetic head.

[0015]

By the way, in the above-mentioned proposed magnetic recording / reproducing apparatus, when the loading operation is completed, the power transmission by the height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus is performed. If the driven gear in the height control mechanism provided on the loading pole side meshed with the driving gear of the system rotates for some reason while the loading operation is not completed, the guide pole The reference height position may deviate from the normal reference height position. However, at the time of the above-described reproduction operation, even if the reference height position of the guide pole is shifted as described above, the height of the guide pole is controlled by the above-described closed loop automatic control operation. Since the reproducing operation is performed in the state of being closed, there is no trouble in the reproducing operation.

However, the recorded magnetic tape obtained when the recording operation is performed in a state where the reference height position of the guide pole is shifted as described above is a magnetic recording / reproducing apparatus which has performed the recording operation. Magnetic recording / reproducing, in which the height of the guide pole is controlled by a closed-loop automatic control operation similar to that of the magnetic recording / reproducing apparatus which performed the above-described recording operation. When the reproducing operation is performed by the apparatus, a good reproducing signal can be obtained by the reproducing operation. However, automatic control of a closed loop in the magnetic recording / reproducing apparatus which has performed the recording operation for producing the recorded magnetic tape is performed. There is no compatibility with magnetic recording / reproducing devices that are configured so that the height of the guide pole cannot be controlled by operation Not obtained good reproduced signal be performed regeneration operation in order. Therefore, the emergence of a magnetic recording / reproducing apparatus free from the above-mentioned problems has been desired.

[0017]

SUMMARY OF THE INVENTION According to the present invention, there is provided a magnetic recording / reproducing apparatus in which a rotating magnetic head is provided so that a rotational trajectory surface is formed at a predetermined position with respect to a fixed portion of a body of a magnetic recording / reproducing apparatus. The recording and reproduction operations are performed on the magnetic tape wound on a part of the drum, and the start and end of the winding on the drum peripheral surface of the magnetic tape to be wound on a part of the drum peripheral surface described above are determined. The height of first and second guide poles provided on the pole bases of the loading mechanisms individually arranged in the traveling path of the first guide is obtained based on a reproduction signal from a magnetic tape. The curvature information of the recording trace at a position near the pole and the curvature information of the recording trace at a position near the second guide pole are changed by a height control signal generated to change the rotation magnetic head. A position sensor and a rotary encoder for generating information on the height of the guide pole and a fixed portion of the body of the magnetic recording / reproducing apparatus are provided so that a closed loop automatic control operation for aligning the recording trace of the magnetic tape with the rolling locus is performed. In a magnetic recording / reproducing apparatus having a height control mechanism including a driving source and a power transmission mechanism, the magnetic recording / reproducing apparatus is provided on a pole base provided in the loading mechanism, and when the loading operation is completed, A driven gear in a height control mechanism provided on a loading pole side engaged with a drive gear of a power transmission system in a height control mechanism provided on a fixed portion side of the body of the recording / reproducing device; and the driven gear described above. The movable member of the position sensor attached to the rotating shaft that changes the height of the guide pole in accordance with the rotation of the Provided on the fixed portion side of the body of the reproducing apparatus, the magnetic recording and reproducing apparatus comprising a fixing member position sensor that generates a position detection signal by detecting the state of displacement of the movable member of said position sensor,
In the magnetic recording / reproducing apparatus in which the closed loop automatic control operation is performed as described above, a position sensor for generating information on the height of the guide pole, a rotary encoder, and a fixed part of a body of the magnetic recording / reproducing apparatus are provided. A magnetic recording / reproducing apparatus having a height control mechanism including a drive source and a power transmission mechanism, wherein a reference edge of the magnetic tape at a winding start portion and a winding end portion of the magnetic tape on a drum peripheral surface. The first and second guide poles are positioned in a space where the guide surfaces of the first and second guide poles can be aligned with the guide portions of the magnetic tape provided near the drum peripheral surface with respect to the reference edge of the magnetic tape. When it is assumed that the reference position is the reference position of the guide surface of the pole, the predetermined range of the upper portion and the lower portion with respect to the reference position of the guide surface is set. The first and second guide poles are provided on a pole base provided in a loading mechanism in a state where the position of the guide surface in the axial direction in the inside can be changed. When the fixed part of the body of the magnetic recording / reproducing apparatus is combined, the component of the height control mechanism provided on the side of the fixed part of the body of the magnetic recording / reproducing apparatus in the above-mentioned height control mechanism, and the pole base side Means for engaging the component members of the height control mechanism provided in the first and second guide poles so that the positions of the guide surfaces of the first and second guide poles coincide with the reference position. Means for adjusting and setting by operation of a closed loop automatic control system.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific contents of a magnetic recording / reproducing apparatus according to the present invention will be described in detail with reference to the accompanying drawings.
FIGS. 1 and 11 and FIGS. 15 and 16 show the state of the pole base and the fixed part of the magnetic recording / reproducing apparatus during the loading operation of the magnetic recording / reproducing apparatus according to different embodiments of the present invention. 2 and 12 are perspective views of the magnetic recording / reproducing apparatus shown in FIG. 1 showing a state in which the magnetic recording / reproducing apparatus shown in FIG. 1 has completed the loading operation and the pole base and the fixed portion of the magnetic recording / reproducing apparatus have been joined. It is a partial perspective view. In each of the drawings described above, illustration of a magnetic tape pulled out from a tape cassette by a loading mechanism, a guide rail for guiding a pole base in the loading mechanism, and the like are omitted for simplification of illustration.

In FIG. 1, FIG. 2, FIG. 11, FIG. 12 and FIGS. 15 and 16, which are perspective views of a part of the magnetic recording and reproducing apparatus of the present invention, DB is a drum base. The drum base DB is fixed to a fixed portion of the body of the magnetic recording / reproducing apparatus. The drum base DB is also a component that functions as a fixing part of the body of the magnetic recording / reproducing apparatus. Dd is a lower drum fixed to the drum base DB, and Du is an upper drum. The upper drum Du and the lower drum Dd constitute a drum structure DA. Md is a drum drive motor provided with the rotor fixed to the upper drum Du. In the following description, it is assumed that the upper drum Du is a rotating drum.

1 is a substrate, and 2 is a drum structure DA.
The center axis 2 is fixed to the center of the lower drum Dd fixed to the drum base DB.
The upper drum Du is rotatably mounted on the center shaft 2 of the drum structure MA via a bearing. 3,4
Is a screw for fixing the stator of the drum motor Md to the substrate 1. H is a rotating magnetic head that rotates at a predetermined rotation speed in the gap G between the upper drum Du and the lower drum Dd. The rotating magnetic head H forms a rotation locus plane at a predetermined position with respect to a fixed portion of the body of the magnetic recording / reproducing apparatus. Needless to say, a required number of rotating magnetic heads H are used according to the magnetic recording / reproducing method applied to the magnetic recording / reproducing apparatus.

BC is a base catcher, and this base catcher BC is provided in the above-mentioned drum base DB. When the loading operation of the magnetic tape performed by the loading mechanism is completed, the magnetic tape is wound around a predetermined range on the outer peripheral surface of the upper drum Du and the lower drum Dd constituting the drum structure DA. Is done. The loading mechanism pulls out a magnetic tape housed in a tape cassette (not shown) at the time of the loading operation, and, when the loading operation is completed, the magnetic tape wound around a part of the drum peripheral surface. And a first pole base PB provided with a first guide pole GP and a slant pole (slant pole) SP, which are arranged on the traveling path on the winding start side around the drum peripheral surface in the first embodiment. I have.

The loading mechanism cooperates with the first guide pole during the loading operation to pull out the magnetic tape housed in the tape cassette, and in a state where the loading operation is completed, A second guide pole provided on a magnetic tape wound around a part of the drum peripheral surface on a traveling path on the end side of the drum peripheral surface, and a second inclined pole provided with an inclined pole; Pole base PB. The first and second pole bases PB are fixed to, for example, a link constituting a loading mechanism, and are fixed by a guide rail (not shown) from the position of the tape cassette to the position of the drum structure DA. It is configured to be able to move along the moving path of the vehicle.

When the loading operation of the magnetic tape by the loading mechanism (not shown) is completed, the upper drum D constituting the above-mentioned drum structure DA is completed.
u and a guide pole G for winding a magnetic tape around a predetermined range on the peripheral surface of the lower drum Dd.
P and the first and second pole bases PB provided with the pair of inclined poles SP are separate base catchers BC whose tip portions are provided corresponding to the respective pole bases PB. Combine with Thereby, the first and second pole bases PB at the time of completion of the loading operation of the magnetic tape by the loading mechanism are predetermined with respect to the fixed portion of the body of the magnetic recording / reproducing apparatus in all of the left-right direction and the up-down direction. It is set in a state where it exists at a spatial position having the specified positional relationship.

As described above, the loading mechanism includes the guide pole GP and the inclined pole SP paired with the guide pole GP.
B, two of which are shown in FIGS. 1, 2 and 1
1, FIG. 12 and FIGS. 15 and 16, one of the two pole bases described above, that is, the part wound around a part of the drum peripheral surface in a state where the loading operation is completed. Only a pole base PB provided with a second guide pole and an inclined pole provided in a traveling path on the end side of the winding of the drum peripheral surface of the magnetic tape is illustrated. The pole base PB on which the one guide pole and the pair of inclined poles are provided is not shown. The pole base PB on which the first guide pole and the pair of inclined poles are provided is a drum structure D in the drawing.
It is not shown because it exists on the opposite side of A.

In the magnetic recording / reproducing apparatus shown in each of the drawings, a control mechanism for controlling the height of the first guide pole and a control mechanism for controlling the height of the second guide pole are used. The same structure as the mechanism is used. Therefore, in the following description of the present specification, in the state where the loading operation of the magnetic tape by the loading mechanism is completed, the traveling path on the end side of the winding of the drum peripheral surface of the magnetic tape wound around a part of the drum peripheral surface A pole base PB provided with a second guide pole placed at a predetermined position in the inside and a tilt pole paired with the second guide pole, and a mechanism for controlling the height of the second guide pole Is often described simply using terms such as the guide pole GP without distinction between the first guide pole and the second guide pole.

First, the magnetic recording / reproducing apparatus shown in FIGS. 1 and 2 will be described. GP is a guide pole, and SP is a tilt pole. As the guide pole GP provided on the pole base PB shown in FIGS. 1 and 2 together with the inclined pole SP, those having various configurations as exemplified in FIGS. 3, 5 to 9, and the like, respectively. Can be used. The top view of the pole base PB shown in FIG. 3A shows the relationship between the guide pole GP, the inclined pole SP, and the magnetic tape T. FIG. FIG. 4 is a vertical cross-sectional view taken along line AA in FIG. 3A, and FIG. 3C is a vertical cross-sectional view of a guide pole GP.

Reference numeral 5 denotes a guide pole shaft. The guide pole shaft 5 is inserted into a hole 6 formed in the pole base PB near the lowermost end thereof. The moving direction of the guide pole shaft 5 is guided. The guide pole shaft 5
, A lower flange 7 having a gear 7g formed on a lower outer periphery is fitted and fixed. A screw 7a is formed on the outer peripheral surface of the boss of the gear 7g formed on the lower flange 7. The above-described gear 7g is a driven gear that is rotated by meshing with a drive gear of a height control mechanism provided on a fixed portion side of a body of a magnetic recording and reproducing apparatus described later. The screw 7a on the outer peripheral surface of the boss portion of the gear 7g is screwed into a female screw 8 provided on the pole base PB. Since the length of the female screw 8 is set to be longer than the screw 7a on the outer peripheral surface of the boss of the gear 7g, when the shaft 5 of the guide pole rotates, the guide pole GP
Will be displaced in the direction of the center line of the shaft 5.

The screw to be screwed into the female screw 8 provided on the pole base PB as described above may be provided on the outer periphery of the shaft 5 of the guide pole. An elastic ring 10 (for example, a rubber ring) is press-fitted between an upper end portion 9 of the pole base PB and a lower surface of a gear 7g formed below the lower flange 7, and the gear 7g is always kept above. Has been energized. Thereby, the screw 7a on the outer peripheral surface of the boss portion of the gear 7g formed on the lower flange 7 and the female screw 8 provided on the pole base PB are tightly screwed together without play. Therefore, the gear 7g provided as a driven gear in the height control mechanism on the pole base side meshes with the drive gear of the height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus. Other than the driving rotation, the rotation is not caused by the external force applied as a disturbance.

Reference numeral 11 denotes an upper flange. The upper flange 11 has a lower surface spaced from the upper surface of the lower flange 7 at an interval equal to the width of the magnetic tape. It is fixed to the shaft 5. A roller 12 is provided between the upper and lower flanges 7 and 11, and the roller 12 is rotatably inserted into the shaft 5 of the guide pole. On the upper end surface of the protruding portion 11a of the upper flange 11, a semicircular light-shielding plate 13 used as a constituent member of a position sensor PS described later performs a good position detection operation of the height position of the guide pole GP. The screw 1 is adjusted so as to have a predetermined mounting phase, which can be performed on the screw 1.
4 fixed. Reference numeral 24 denotes a photo interrupter in the position sensor PS that cooperates with the light shielding plate 13 described above.

In FIGS. 1 and 2 (the same applies to FIGS. 11, 12, 15, and 16), Mg is a motor, and
Is a rotary encoder. As the rotary encoder RE, any of well-known rotary encoders having a function of generating and outputting a pulse having information on the rotation direction of the rotation axis of the motor Mg and information on the rotation amount may be used. Can be selected and used. The rotary encoder RE shown in each of the above-described drawings is shown as being constituted by a light-shielding blade 16 and a photo-interrupter 17 attached to a rotating shaft 15 of a motor Mg. The above-mentioned motor Mg
A gear 18 is fixed to the shaft 15 in addition to the light shielding blade 16 of the rotary encoder RE, and a gear 19 in a power transmission system is meshed with the gear 18. Reference numeral 21 denotes a rotation shaft of the gear 19. A gear 20 is fixed to the rotating shaft 21, and the gear 20 is meshed with a gear 22 fixed to the rotating shaft 23. The gear 22 is a drive gear of a height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus.

The operation of the loading mechanism (not shown) causes the pole base PB to move along the predetermined moving path from the position of the magnetic tape cassette to the position of the drum structure DA, and the loading operation of the magnetic tape by the loading mechanism is performed. In the completed state, when the tip of the pole base PB is positioned by engaging with the base catcher BC provided corresponding to the pole base PB, the pole base PB is placed on the pole base side. A gear 7g provided as a driven gear in the height control mechanism is meshed with a drive gear 22 of the height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus.

By the way, when the operation of the loading mechanism is completed as described above, the tip of the pole base PB is positioned by engagement with the base catcher BC provided corresponding to the pole base PB. However, in order to completely engage the tip of the pole base PB and the base catcher BC as described above, the gear 7g on the pole base side and the body of the magnetic recording / reproducing apparatus are required. It is necessary that the drive gear 22 of the height control mechanism provided on the fixed portion side be completely meshed.

However, in the case where the tips of the teeth of the driving gear 22 and the driven gear 7g have a flat shape as illustrated in FIG. 10A. Immediately before the operation of the loading mechanism is completed, the flat portion at the tip of the tooth of the driving gear 22 and the driven gear 7a
Collision with the flat part of the tip of the tooth, the pole base P
The tip of B and the base catcher BC may not be completely engaged. The above problem is caused by the drive gear 2
The problem can be solved by using the toothed drive gear 22 and the driven gear 7a in which the tip of the second tooth and the tip of the driven gear 7a have no flat portion as shown in FIG. 10B. FIG.
(C) shows both gears 2 at the time of completion of the operation of the loading mechanism in the case of using the driving gear 22 having the tooth form as illustrated in FIG. 10 (b) and the driven gear 7a.
It is a figure which illustrates and illustrates the state of meshing of 2 and 7a.

FIG. 4 is a view for explaining a manner of detecting a reference position (reference height position of the guide pole GP) by the position sensor PS constituted by the light shielding plate 13 and the photo interrupter 24. In the figure, 25 is a light emitting element and 26 is a light receiving element. In the illustrated example, the light emitting element 25 is used.
The position sensor PS is configured to generate a position signal when the light-shielding plate 13 enters and exits in the optical path from the light-receiving element 26 to the light-receiving element 26. A reflection type in which light reflected by the light shielding plate 13 is received by a light receiving element to generate a position signal may be used. Instead of an optical position sensor, for example, a position sensor constituted by a permanent magnet and a magnetic detection element (for example, a Hall element) may be used.

Light shield plate 1 in position sensor PS described above.
3 is attached to the upper end surface of the protrusion 11a of the upper flange 11 in the guide pole GP as described above.
When mounting the upper flange 11 of the upper flange 11 of the light shielding plate 13 on the upper end surface, the guide surface of the guide pole GP (the upper surface of the lower flange 7 of the guide pole, the lower surface of the upper flange 11 of the guide pole, the lower surface of the guide pole) When the surface of the roller is at a predetermined regular height position for ensuring the recording / reproducing compatibility of the magnetic recording / reproducing apparatus, the light-shielding plate 13 of the position sensor PS is rotated by the reference rotation. The position, that is, the moment when the light from the light emitting element 25 is received by the light receiving element 26 when the light goes out of the optical path between the light emitting element 25 and the light receiving element 26 disposed in the photointerrupter 24 so as to face each other. The light shielding plate 13 of the position sensor PS is attached to the upper end surface of the protruding portion 11a of the upper flange 11 by the screw 14 so as to be at the position (see FIG. 4A).

The guide pole GP to which the light shielding plate 13 of the position sensor PS is attached is, as described above, a drive of the power transmission system in the height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus. When the driven gear 7g in the height control mechanism provided on the loading pole side meshed with the gear 22 is driven and rotated,
It is configured to be able to move up and down. Therefore, even when the driven gear 7g is not meshed with the driving gear 22, the guide pole GP
When any rotational force is applied to P, the guide pole GP rotates and the guide pole GP moves upward and downward.

Also, as described above, the height position of the guide surface of the guide pole GP is at the regular height position predetermined for the magnetic recording / reproducing apparatus in order to ensure recording / reproducing compatibility. At the time, the light shielding plate 1 of the position sensor PS
Even when the guide pole GP is attached to the guide pole GP such that the reference position 3 is at the reference rotation position, when the guide pole GP has rotated one or more turns, the light shielding plate 13 of the position sensor PS is at the reference rotation position. However, the position sensor PS in that state
The rotation position based on the light shielding plate 13 does not correspond to the height position of the guide surface of the guide pole GP.

Thus, the guide surface of the guide pole GP is
The light shielding plate 13 of the position sensor PS is set to a reference rotation position in correspondence with a state where the magnetic recording / reproducing apparatus is at a predetermined regular height position for ensuring recording / reproducing compatibility. After being attached to the guide pole GP, the guide pole GP is prevented from rotating even when an external force acting as a disturbance is applied to the guide pole GP, or when the external force acting as a disturbance is applied to the guide pole GP, the guide pole GP is It is desired that even if it turns, it cannot turn more than one turn. Further, it is preferable that the light shielding plate 13 of the position sensor PS can be easily attached to the guide pole GP at the reference rotation position.

As described above, after the light shielding plate 13 of the position sensor PS is mounted on the guide pole GP such that the light shielding plate 13 is at a reference rotation position with respect to the guide pole GP, an external force acting as a disturbance is applied to the guide pole GP. In order to prevent the guide pole GP from rotating, for example, as described above with reference to FIG. 3, the upper end 9 of the pole base PB and the lower surface of the gear 7g formed below the lower flange 7 An elastic ring 10 (for example, a rubber ring) is press-fitted therebetween, and a screw 7a on an outer peripheral surface of a boss portion of a gear 7g formed on the lower flange 7 and a female screw 8 provided on a pole base PB are: Means such as screwing tightly with no play is effective.

In order to make the screw connection used for the displacement of the guide pole GP similar to the above-mentioned one so that the screw connection is screwed tightly without any play, an elastic body (spring) is attached to the screw connection part. 5), FIG. 8, and FIG. 9 illustrate examples of the configuration of the guide pole GP configured to prevent the guide pole PG from rotating easily by applying the means of applying a preload according to (1).
That is, the spring 30 in the guide pole GP shown in FIG. 5 or the guide pole GP shown in FIG.
9 and the spring 43 of the guide pole GP shown in FIG.

The guide pole GP having such a configuration that even when the guide pole GP is rotated when the external force acting as a disturbance is applied to the guide pole GP as described above, the guide pole GP cannot rotate more than one rotation is provided. For example, as illustrated in FIG. 6 and FIG.
This can be realized by providing stoppers 32 (in the case of FIG. 6) and 33 (in the case of FIG. 7) in the movement path of the control. Further, the guide pole GP has a configuration in which the light shielding plate 13 of the position sensor PS can be easily attached to the reference rotation position with respect to the guide pole GP described above.
For example, as illustrated in FIGS. 5, 8, and 9, a long hole 28 is provided in the light shielding plate 13 of the position sensor PS, and the light shielding plate 13 is rotated so as to be a reference rotation position. It can be easily realized by fixing with screws 27 after adjusting the movement.

Next, the guide pole GP illustrated in FIGS. 5 to 9 will be described. First, the guide pole GP shown in FIG. 5 is configured such that a light shielding plate 13 having an elongated hole 28 formed in a part of the upper surface of a gear 7g provided on the lower flange 7 of the guide pole GP is rotated by a predetermined rotation phase. After adjusting to the state shown in FIG. The screw 7a on the outer peripheral surface of the boss of the gear 7g formed on the lower flange 7 to which the shaft 5 of the guide pole is inserted and fixed.
Is screwed into the female screw 8 provided on the pole base PB. Since the length of the female screw 8 is set to be longer than the screw 7a on the outer peripheral surface of the boss of the gear 7g, when the shaft 5 of the guide pole rotates, the guide pole GP It will be displaced in the direction of the center line of the shaft 5. 5A is a side sectional view, and FIG. 5B is a transparent top view of a guide pole portion.

A stopper 29 is attached near the lower end of the shaft 5 of the guide pole. The upper surface of the stopper 29 and the upper wall of the cavity 29 formed in the pole base PB. A spring 30 is provided between the guide poles GP.
Are always biased downward. Therefore, the screw 7a on the outer peripheral surface of the boss portion of the gear 7g formed on the lower flange 7 and the female screw 8 provided on the pole base PB are tightly screwed together without play. The gear 7g provided as a driven gear in the height control mechanism on the pole base side is driven by meshing with a drive gear of a height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus. Other than the rotation, it does not rotate due to an external force applied as a disturbance.

Next, in the guide pole GP shown in FIG. 6, the operating portion 32a of the stopper 32 is provided in the rotation locus of the light shielding plate 13 attached to the upper end surface of the protrusion 11a of the upper flange 11 of the guide pole GP. The light shielding plate 13 cannot rotate more than one rotation. FIG. 6A is a perspective view, and FIGS. 6B and 6C are plan views illustrating the operation of the operating portion 32a of the stopper 32 with respect to the light shielding plate 13. FIG.

The guide pole GP shown in FIG. 7 is provided with a stopper 33 in the rotation path of the light shielding plate 13 attached to the lower end surface of the gear 7g provided on the lower flange 7 of the guide pole GP.
Are arranged so that the light shielding plate 13 cannot rotate more than one rotation. 34 is a set screw. 7A is a side sectional view, and FIG. 7B is a transparent top view of a guide pole portion.

Next, the guide pole GP shown in FIG. 8 has a lower flange 7 into which the shaft 5 of the guide pole is inserted.
The screw 7a provided on the peripheral surface of the projecting portion below the
Is screwed into a female screw provided in the hole at the center of the hole. Also,
The gear 37g is provided with a light-shielding plate 13 having a long hole 28 formed therein, the screw 27 being adjusted to a predetermined rotational phase.
It is designed to be installed with. The shaft 5 of the guide pole is inserted through the lower flange 7 and the upper flange 11 of the guide pole GP, and a stopper 35 is fixed to the lower end of the shaft 5 of the guide pole. The stopper 35 is provided with protrusions 35a and 35b for stopping rotation. The lower end of the guide pole shaft 5 and the stopper 35 protrude into a cavity 38 provided in the pole base PB, and the detents 35a and 35b for stopping rotation are provided in the pole base PB. The slits 39 and 40 are loosely fitted.

Reference numeral 36 denotes a spring provided between the upper surface of the stopper 35 and the upper wall of the cavity 38 provided in the pole base PB. Are always biased downward. Therefore, the screw 7a provided on the peripheral surface of the projecting portion below the lower flange 7 and the gear 37
The female gear provided in the hole at the center of g is in a tightly screwed state without play, and is provided as a driven gear in the height control mechanism on the pole base side. The 37g is not rotated by an external force applied as a disturbance, except that the 37g is driven and rotated by being engaged with a drive gear of a height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus. 8A is a side sectional view, FIG. 8B is a top view, and FIG. 8C is a bottom view.

In the guide pole GP shown in FIG. 9, the lower end of the shaft 5 of the guide pole projects from below the pole base, and a screw 5a provided on the outer peripheral surface of the lower end of the shaft 5 of the guide pole is provided. It is screwed into a female screw provided in a hole at the center of the gear 37g. The light-shielding plate 13 having a long hole formed in a part of the upper surface of the gear 37g is adjusted to a predetermined rotation phase and then attached with the screw 27. Also, the guide pole shaft 5
Are the lower flange 7 and upper flange 11 of the guide pole GP.
Has been inserted. The hole 7b provided on the lower surface side of the lower flange 7 and the hole 45 provided on the pole base PB have:
A detent member 44 is provided.

Recess 42 provided on top of pole base PB
A spring 43 is provided between the bottom of the lower flange 7 and the lower surface of the lower flange 7, and the guide pole GP is urged by the spring 43 so as to be constantly pushed upward. Thus, the screw 5a provided on the outer peripheral surface of the lower end of the shaft 5 of the guide pole and the female screw provided in the hole at the center of the gear 37g are tightly screwed together without play. The gear 37g provided as a driven gear in the height control mechanism on the pole base side meshes with the drive gear of the height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus. In addition to the drive rotation, it does not rotate due to an external force applied as a disturbance. 9A is a side cross-sectional view, FIG. 9B is a bottom view, and FIG. 9C is a vertical cross-sectional view of a detent portion.

In the magnetic recording / reproducing apparatus described above with reference to FIGS. 1 to 10, fixing means for attaching the light shielding plate 13 of the position sensor PS to the flange of the guide pole GP. The screw 14 was used as. However, when the screw 14 is used as a fixing means for attaching the light shielding plate 13 of the position sensor PS to the flange of the guide pole GP as described above, the upper flange and the guide are provided to provide a screw hole in the flange. To prevent the press-fitting of the pole shaft 5 from being removed, increase the number of screw tightening steps, or to protrude the screw head upward, and to prevent the screw head from protruding upward as described above, In the case where is used, there may be a problem in production such as a necessity of a dulling step.

FIGS. 11 and 12 show that the light shielding plate 13 of the position sensor PS is formed by using an elastic material as the light shielding plate 13 of the position sensor.
1 shows a magnetic recording / reproducing apparatus having a configuration in which the magnetic recording / reproducing apparatus is fixed to the guide pole GP without using a mounting screw (14 in FIGS. 1 and 2). FIG.
1 and the light shielding plate 13 of the position sensor shown in FIG.
FIG. 13 is a diagram for explaining a specific configuration of FIG.
(A) is a top view of the pole base PB, and (b) of FIG.
13A is a longitudinal sectional view taken along the line AA in FIG. 13A, FIG. 13C is a perspective view of the light shielding plate 13 of the position sensor, and FIGS. FIG. 7E is a longitudinal sectional view showing various mounting examples of the light shielding plate 13 of the position sensor made of an elastic material. FIG.
10s in (b) is a spring for urging the lower flange 7 on which the driven gear 7 is provided.

The light shielding plate 13 of the position sensor illustrated in FIG. 13C has the whole or at least the attachment portion 13a made of an elastic material. The elastic material is selected from various synthetic resin materials, various metals and the like. 13b is a light shielding plate 13 of the position sensor
This hole is used when press-fitting and fixing to the shaft 5 of the guide pole or press-fitting and fixing to the outer periphery of the protruding portion 11a of the upper flange 11. (B) of FIG.
The light shielding plate 13 of the position sensor illustrated in FIG.
3 shows a case in which the hole 13b of the position sensor 3 is press-fitted and fixed to the shaft 5 of the guide pole, and the light-shielding plate 13 of the position sensor illustrated in FIG. 13 shows a case where the light-shielding plate 13 of the position sensor illustrated in FIG. 13E is fixed to the outer periphery of the protrusion 11a of the upper flange 11 by press-fitting. The outer part is the upper flange 1
1 shows a case in which the protrusion 11a is press-fitted and fixed to the inner periphery of the protrusion 11a. Since the light shielding plate 13 of the position sensor is made of an elastic material as described above, the mounting screw (14 in FIGS. 1 and 2) is used for mounting the light shielding plate 13 of the position sensor PS. Therefore, the above-mentioned problem can be satisfactorily solved.

In the magnetic recording / reproducing apparatus described with reference to FIGS. 1 to 10, the diameter of the upper flange 11 and the diameter of the lower flange 7 of the guide pole GP are used as the light shielding plate 13 of the position sensor PS. A larger diameter is used, and further meshes with a drive gear 22 of a height control mechanism provided on a fixed portion side of the body of the magnetic recording and reproducing device.
As the driven gear 7g in the pole base-side height control mechanism, one having a diameter larger than the diameter of the upper flange 11 and the diameter of the lower flange 7 of the guide pole GP has been used.
In the magnetic recording / reproducing apparatus, as described above, the guide pole GP provided on the pole base PB is:
Prior to the start of the loading operation, the openings Msu and Mt provided in the tape cassette indicated by the arrow TC in FIG.
u.

The guide pole GP provided on the pole base PB is moved from the position indicated by the arrow UL in FIG. 14 before the start of the loading operation to the end of the loading operation by the operation of the loading mechanism. Is moved to the position indicated by the arrow LE in FIG. FIG.
The tape cassette TC shown in FIG. 1 is shown in a perspective view in order to facilitate the description of the operation, and the cassette lid is not shown. By the way, the guide pole GP provided on the pole base PB before the start of the loading operation indicated by the arrow UL in FIG.
Is a position very close to the magnetic tape stretched over the tape cassette TC in the small openings Msu and Mtu provided in the tape cassette.

If the magnetic tape housed in the tape cassette TC is in a slack state for some reason, it is supported by the cassette housing (not shown) at the start of the loading operation. Openings Msu, Mt in the tape cassette TC
When a guide pole GP or a slant pole SP provided on the pole base PB is inserted into u, a position sensor having a diameter larger than the diameter of the upper flange 11 or the diameter of the lower flange 7 of the guide pole GP. PS light shielding plate 13
Also, the driven gear 7g of the height control mechanism on the pole base side having a diameter larger than the diameter of the lower flange 7 of the guide pole GP may contact the slack magnetic tape and damage the magnetic tape. . So, FIG.
In the magnetic recording / reproducing apparatus shown in FIG. 12, the light shielding plate 13 of the position sensor PS, the driven gear 7g in the height control mechanism on the pole base side, and the like are used for the diameter of the upper flange 11 of the guide pole GP and the lower flange. 7 has a diameter smaller than the diameter of 7, so that the above-mentioned problem does not occur.

Now, in the magnetic recording / reproducing apparatus shown in FIGS. 1 and 2 and FIGS. 11 and 12, the loading operation is completed and the tip of the pole base PB is provided corresponding to the pole base PB. Base catcher B
C, the driven gear 7g of the pole base-side height control mechanism meshed with the drive gear of the height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus. When the recording / reproducing operation is performed after the state has been set, the running path of the magnetic tape on the drum peripheral surface of the magnetic tape wound on a part of the drum peripheral surface is at the start of winding on the drum peripheral surface. The height of the lower flange 7 of the first guide pole arranged in the running path of the magnetic tape, and the height of the lower flange 7 of the second guide pole arranged in the running path of the magnetic tape on the end side of the drum peripheral surface. It can be changed by changing the height of the flange 7 as described above.

When the loading operation of the magnetic tape by the loading mechanism is completed, the magnetic tape wound around a part of the drum peripheral surface is arranged at a predetermined position in the running path on the side of the winding start side of the drum peripheral surface. A first guide pole in a closed state, and a second guide pole arranged in a predetermined position on a traveling path on the end side of the winding of the drum peripheral surface of the magnetic tape wound around a part of the drum peripheral surface. The height of the lower flange 7 of each of the guide poles is set to be a predetermined regular height for ensuring the compatibility of the recording / reproducing operation of the magnetic recording apparatus. In a state where the recording / reproducing apparatus is in the reproducing mode, the height of the lower flange 7 of the first guide pole is obtained based on the reproduction signal from the magnetic tape. A height control signal generated by using the bending information of the recording trace at a close position is changed by a height control mechanism, and the height of the lower flange 7 of the second guide pole is set to a value from the magnetic tape. The height of the rotary magnetic head is changed by a height control signal generated by using a height control signal generated by using the bending information of the recording trace at a position near the second guide pole obtained based on the reproduction signal. By performing a control operation such that the recording trace of the magnetic tape matches the rotation trajectory, a good reproduction operation can be realized.

That is, the normal recording mark bend appearing in the recording trace of the recorded magnetic tape to be reproduced in the magnetic recording / reproducing apparatus is S-shaped, and the S-shaped bend of the recording trace is the drum peripheral surface. The height of the lower flange of the first guide pole which is arranged at a predetermined position in the traveling path on the side of the winding start side of the drum around the drum peripheral surface of the magnetic tape wound around a part of the magnetic tape (magnetic tape Of the magnetic tape wound around a part of the drum peripheral surface, and the lower portion of the second guide pole disposed at a predetermined position in the traveling path on the end side of the drum peripheral surface of the drum. The height of the flange 7 (the position of the running path of the magnetic tape) and the opposite direction, namely,
If one is raised, the other is low, and so on by changing the heights of the first and second guide poles in directions opposite to each other. A first guide pole disposed on a traveling path on the magnetic tape at the beginning of winding on the drum peripheral surface so that correction is performed, and a first guide pole disposed on a traveling path on the magnetic tape at the winding end side of the drum peripheral surface. The height of the lower flange 7 with respect to the second guide pole is controlled by a height control mechanism to which a control signal obtained on the basis of the information on the curvature of the recording trace is applied, whereby the curvature of the recording trace can be easily adjusted. And a good reproduction signal free from the influence of the above can be obtained.

The state of the envelope of the reproduced frequency modulated wave signal obtained from the magnetic recording / reproducing apparatus in the reproducing mode is wavy corresponding to the S-shaped curve of the recording trace. Then, after detecting the reproduced frequency modulated wave signal by the amplitude detector, for example, a signal portion near the head of the envelope signal corresponding to each one recording trace sequentially output from the amplitude detector, Sampling is performed at a time position at which a signal portion near the end and an intermediate signal portion can be extracted, and sampling is performed from a signal portion near the head in the envelope signal corresponding to each of the above-described sequential recording traces. The height of the lower flange 7 of the first guide pole disposed in the traveling path on the drum start side on the drum peripheral surface is changed based on the detected signal and the signal extracted from the intermediate signal portion. And generates a height control signal having a magnitude and a direction to supply the control signal to the motor Mg of the height control mechanism of the lower flange 7 of the first guide pole.

Further, based on the signal sampled from the signal portion near the end and the signal extracted from the intermediate signal portion in the envelope signal corresponding to each of the recording traces in sequence, the drum peripheral surface is determined. A height control signal having a size and a direction for changing the height of the lower flange 7 of the second guide pole disposed in the traveling path on the end side of the winding to the second guide pole and generating the control signal. The second guide pole is supplied to the motor Mg of the height control mechanism of the lower flange 7 of the guide pole. The magnitude of the signal sampled from the intermediate signal portion in the envelope signal corresponding to the reproduced frequency-modulated wave signal reproduced from one recording trace depends on the height of the first and second guide poles. Even if the height is changed, it does not change significantly. The information on the change in height can be easily obtained by comparing successive sample values on the time axis at the same position in the reproduced frequency modulated wave signal reproduced from each recording trace and the corresponding envelope signal. Is obtained. The height control signal can be generated by a control device including a microprocessor.

The different heights for changing the height of the lower flange 7 of the first and second guide poles to which the drive signal corresponding to the height control signal generated as described above is supplied. The motor Mg in the control mechanism of (1) is controlled by a drive signal corresponding to a height control signal having a magnitude and a direction that are individually supplied to the signal in the forward (or reverse) direction according to the signal. Rotate by the appropriate amount. The rotational force of the motor Mg is transmitted to the driving gear 22 via the gears 18, 19, 20 fixed to the rotating shaft 15, and transmitted to the driven gear 7g meshed with the driving gear 22. The driven gear 7g rotates in the forward (or reverse) direction. As a result, the guide pole GP is displaced in the direction of the center line of the guide pole shaft 5, so that the position of the lower flange 7 fixed to the guide pole shaft 5 depends on the amount of rotation of the driven gear 7g. It will be displaced upward and downward.

In the magnetic recording / reproducing apparatus described above, the light shielding plate 13 of the position sensor PS obtained from the position sensor PS is used.
And a pulse output from the rotary encoder RE and having information on the rotation direction and the amount of rotation of the rotation shaft 15 of the motor Mg are supplied to the control device. Generates a control signal for the height of the first and second guide poles, thereby driving the motor Mg of the height control device. It is easy to set the height of the lower flange 7 (the height of the guide surface of the guide pole GP) with high accuracy.

That is, the height of the guide surface (height of the lower flange 7) of the guide pole GP fixed to the shaft 5 of the guide pole is at the reference rotation position of the light shielding plate 13 of the position sensor PS. Of the position sensor PS from the reference rotation position of the light-shielding plate 13 of the position sensor PS corresponding to the above-mentioned reference height. Thus, the reference height position of the guide surface of the guide pole GP can be determined from the output signal from the position sensor PS, and the amount of change in the height (time) from the reference height position of the guide surface of the guide pole GP. The movement amount) can be known from the number of output pulses of the rotary encoder RE. The height of the lower flange 7 fixed to the shaft 5 of the first and second guide poles (the height of the guide surface of the guide pole GP) is output when the height is at the reference height position. The counter is preset to a predetermined value by the output signal of the position sensor PS, and counts the number of pulses output from the rotary encoder RE provided on the motor Mg used to rotate the guide pole GP. It can be detected by counting.

Next, the setting of the standard height of the guide pole GP at the time of manufacturing the magnetic recording / reproducing apparatus (regular height predetermined for ensuring compatibility of the recording / reproducing operation) will be described. First, a standard tape (recorded magnetic tape having no bent recording traces) is mounted on the magnetic recording / reproducing apparatus, and the height of the guide pole GP on the winding start side of the magnetic tape around the drum peripheral surface is increased. The motor Mg in the control mechanism is rotated forward or backward until a signal corresponding to the reference rotation position of the light shielding plate 13 is output from the position sensor PS. The counter counts until a signal corresponding to the reference rotation position of the light shielding plate 13 is output from the position sensor PS in the height control mechanism of the guide pole GP on the winding start side of the magnetic tape around the drum peripheral surface. The preset number of pulses output from the rotary encoder RE is preset to a predetermined value (for example, zero). A guide pole G at the end of winding of the magnetic tape around the drum peripheral surface is similar to the above.
The same applies to the P height control mechanism.

Next, the standard tape is run, and after the running state is stabilized, the reproduced frequency-modulated wave signal is detected by the envelope detection circuit. Sampling is sampled at a time position such that a signal portion near the head, a signal portion near the end, and a signal portion in the middle can be extracted from the envelope signal corresponding to each successive recording trace output from the envelope detection circuit and corresponding to each recording trace. And analog-to-digital conversion of the sample value is given to the CPU. The CPU detects the above-mentioned envelope signal and uses the motor Mg in the height control mechanism of the guide pole GP on the winding start side of the magnetic tape around the drum peripheral surface to control the guide pole on the winding start side of the magnetic tape around the drum peripheral surface. The height of the GP is changed over its variable range, and the envelope value that changes with the change in the height of the guide pole GP (counter value of the counter) is calculated and written to the memory. From the envelope signal obtained over the variable range of the height, a counter value indicating the state of the highest flatness is written to an external nonvolatile memory.

The same applies to the height control mechanism for the guide pole GP at the end of winding the magnetic tape around the drum peripheral surface. The counter value written in the external non-volatile memory as described above is determined by the magnetic recording / reproducing apparatus by the standard height of the guide pole GP (the regular height determined in advance for ensuring the compatibility of the recording / reproducing operation). Height).
Therefore, at the time of the recording operation of the magnetic recording / reproducing apparatus, if the height position of each guide pole GP is set corresponding to the counter value written in the external nonvolatile memory,
The height position of each guide pole GP is set to a predetermined regular height for ensuring compatibility of the recording / reproducing operation.

Now, as has been apparent from the description which has been given so far with reference to FIGS. 3 to 10 and the magnetic recording / reproducing apparatus shown in FIGS. 1 and 2, FIGS. In the magnetic recording / reproducing apparatus according to an embodiment of the present invention, the tip of the pole base PB moves along a predetermined moving path from the position of the cassette of the magnetic tape to the position of the drum structure DA by the operation of the loading mechanism. When the loading operation is completed, a base catcher BC provided corresponding to the pole base PB is provided.
When the position is determined by engagement with the pole base PB, it is provided as a driven gear in a pole base side height control mechanism provided for changing the height of the guide pole GP provided on the pole base PB. 7g of gear
Are completely meshed with the drive gear 22 of the height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus, and the guide pole GP The light-shielding plate 13 of the position sensor PS corresponds to the state where the guide surface is at a predetermined regular height position with respect to the magnetic recording / reproducing apparatus for ensuring recording / reproducing compatibility. Guide pole G so that
After mounting on P, the external force acting as disturbance
To prevent the guide pole GP from rotating even if it joins P
A preload is applied by an elastic body to the screw connection portion so that the screw connection state used for the displacement of the guide pole GP is in a tightly screwed state without play, The external force acting as a disturbance is the guide pole GP
When the guide pole GP is rotated when
A stopper may be provided in the movement path of the light shielding plate 13 of the position sensor PS so that the rotation cannot be performed more than the rotation. Further, the light shielding plate 13 of the position sensor PS may be easily moved relative to the guide pole GP to the reference rotation position. An elongated hole 28 is provided in the light-shielding plate 13 of the position sensor PS so that the light-shielding plate 13 can be attached in a state, and the light-shielding plate 13 is adjusted to rotate so as to be a reference rotation position, and then fixed with the screw 27. The magnetic tape to be wound around a part of the drum peripheral surface is provided on a pole base of a loading mechanism that is individually disposed in a traveling path between a winding start side and a winding end side of the drum peripheral surface. The heights of the first and second guide poles are determined based on the bending information of the recording trace at a position close to the first guide pole obtained based on the reproduction signal from the magnetic tape. Automatic control of a closed loop that adjusts the recording trace of the magnetic tape to the rotation locus of the rotating magnetic head by changing the height according to the height control signal generated using the bending information of the recording trace at a position near the second guide pole. It is configured to include a position sensor and a rotary encoder for generating information regarding the height of the guide pole so that the operation is performed, and a drive source and a power transmission mechanism provided on a fixed portion of the body of the magnetic recording / reproducing apparatus. A magnetic recording / reproducing apparatus having a height control mechanism, even during a recording operation, performs the above-described closed loop automatic control operation, thereby ensuring a regular recording / reproducing apparatus which is predetermined with respect to the magnetic recording / reproducing apparatus in order to ensure recording / reproducing compatibility. The height position of the guide surface is automatically set at the height position.

Next, in the magnetic recording / reproducing apparatus of the present invention, which will be described with reference to FIGS. 15 to 21, a pole base moving along a predetermined moving path from the position of the cassette of the magnetic tape to the position of the drum structure DA. Even if the guide pole GP provided on the PB is rotated by an external force that causes disturbance, the configuration is such that the height position of the guide pole GP does not change due to the rotation. Height of the first and second guide poles provided on the pole bases of the loading mechanism individually arranged on the traveling path between the winding start side and the winding end side of the magnetic tape to be wound around the drum peripheral surface. And the recording information bending information at a position near the first guide pole obtained based on a reproduction signal from a magnetic tape and the position near the second guide pole. The guide pole is changed by a height control signal generated by using the bending information of the recording trace so that the closed loop automatic control operation for aligning the recording trace of the magnetic tape with the rotation locus of the rotary magnetic head is performed. A magnetic sensor having a height control mechanism including a position sensor and a rotary encoder for generating information relating to the height of the vehicle, and a drive source and a power transmission mechanism provided on a fixed portion of a body of the magnetic recording and reproducing apparatus. The recording / reproducing apparatus, even during the recording operation, by the above-described closed loop automatic control operation, at a regular height position predetermined for the magnetic recording / reproducing apparatus in order to ensure recording / reproducing compatibility,
The height position of the guide surface is automatically set.

In the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 15 and 16, the first and the last parts provided corresponding to the start and end of the magnetic tape on the drum peripheral surface are provided.
The second guide pole GP is located within a range between a predetermined upper portion and a lower portion with respect to a predetermined regular height position of the magnetic recording / reproducing apparatus for ensuring recording / reproducing compatibility. The individual pole bases PB are slidably provided such that the height position of the guide surface can be changed in the axial direction. That is, as described in detail later with reference to FIGS. 17 to 19, the first and second guide poles GP are moved in one direction by a spring while being slidable in the axial direction. As an energized configuration, it is provided on an individual pole base PB. FIGS. 15 and 16 show a state during the loading operation by the loading mechanism. FIG.
5 and FIG. 16 do not show a magnetic tape.

When the loading operation of the magnetic tape by the loading mechanism is completed, the drum structure DA
A guide pole GP in which a magnetic tape is wound around a predetermined range on the peripheral surface of the upper drum Du and the lower drum Dd constituting the guide pole GP;
The first and second pole bases PB provided with the inclined poles SP forming a pair with the first and second pole bases PB are connected to the individual base catchers BC, and the first and second pole bases PB are connected to the first and second pole bases PB.
Each of the second pole bases PB is set to a spatial position having a predetermined positional relationship with respect to a fixed portion of the body of the magnetic recording / reproducing apparatus.

The positioning of the pole base PB is performed by coupling the concave portion indicated by 48 in FIGS. 15 and 16 of the fixing portion of the fuselage with the portion indicated by 49 of the pole base PB in the horizontal plane of the pole base PB. Positioning in the inward direction is performed, and the vertical positioning projection 50 provided on the pole base PB and the positioning portion provided on the base catcher BC engage with the positioning base 50 so that the pole base PB is positioned in the vertical direction. Is performed.

Incidentally, the first and second guide poles GP
Are provided on the individual pole bases PB in such a manner that they can be slid in the axial direction and are urged in one direction by a spring. A component of the height control mechanism provided on the fixed part side of the body of the magnetic recording / reproducing apparatus in the height control mechanism used to change the height of the guide pole GP in a state where it is connected to the catcher BC. And the component members of the height control mechanism provided on the pole base side are engaged, the guide pole G
The height of the guide surface of P will be set to the height determined by the height control mechanism at that time.

FIG. 17A is a side view of the pole base PB in the magnetic recording / reproducing apparatus shown in FIG. 15, and FIG. 17B is a view of FIG. An engaging portion 54a formed at the tip of a lower flange 54 shown therein and a boss portion of a gear 46 in a height control mechanism provided on a fixed portion side of the body of the magnetic recording / reproducing apparatus. It is a partial side sectional view which illustrates and illustrates the engaged state with the engaged engaging groove 46b. 5 is the guide pole GP
The shaft 5 of this guide pole is
The lower part of it is inserted into a hole drilled in the pole base PB, and the guide pole shaft 5 is
The sliding can be performed in a state where the moving direction is guided on the wall surface of the hole.

In FIG. 17, reference numeral 11 denotes an upper flange fixed to the shaft 5 of the guide pole.
4 is a lower flange. The lower flange 54 has an engaging portion 54a which can engage with an engaging groove 46b formed in a boss portion of a gear 46 in a height control mechanism provided on a fixed portion side of the body of the magnetic recording / reproducing apparatus. Is formed. Reference numeral 12 denotes a roller having a length equal to the width of the magnetic tape T. A spring 56 is wound around the guide pole shaft 5 between the lower surface of the lower flange 54 and the concave portion 55 provided at the upper end of the pole base PB. Thereby, the upper and lower flanges 11, 54 fixed to the shaft 5 of the guide pole
The roller 12 and the like rotating about the shaft 5 as a center of rotation between the upper and lower flanges 11 and 54 are urged upward by the spring 56.

At the lower end of the guide pole shaft 5, a hollow portion 59 provided in the pole base PB is provided.
Since the washer 57 is fixed with the screw 58 in a state of being protruded inward, the guide pole GP is
The upper limit position of the displacement is determined in a state where the washer 57 is in contact with the upper wall of the hollow portion 59 provided in B. In FIG. 15, a light-shielding blade plate 16 forming a part of a rotary encoder RE and a gear 18 forming a part of a power transmission system are fixed to a rotating shaft 15 of a motor Mg. Reference numeral 17 denotes a photo interrupter which forms a part of the rotary encoder RE.

A gear 19 is engaged with the gear 18 fixed to the rotating shaft 15 of the motor Mg. Reference numeral 20 denotes a gear provided on the same rotating shaft 21 as the gear 19 described above, and the gear 20 is meshed with a gear 46. An engagement groove 46b is formed in the boss of the gear 46. In addition, the gear 2
The light-shielding plate 13, which constitutes a part of the position sensor PS, is attached to the upper part of the rotation shaft 47 by a screw 14. Reference numeral 24 denotes a photo interrupter that constitutes the position sensor PS together with the light shielding plate 13 described above. A screw 47g is provided on the outer peripheral surface of a portion below the rotation shaft 47 of the gear 46.
Is screwed, and the screw 47g is a drum base D
B is screwed into a female screw 53g screwed into the protrusion 53.

When the magnetic recording / reproducing apparatus changes from a state in the middle of the loading operation illustrated in FIG. 15 to a state in which the loading operation is completed (not shown), as described above, the tip of the pole base PB is turned on. However, in combination with the base catcher BC, the pole base PB is set to a spatial position having a predetermined positional relationship with respect to the fixed portion of the body of the magnetic recording / reproducing apparatus. When the magnetic recording / reproducing device has completed the loading operation,
An engaging portion 54a formed at the tip of a lower flange 54 used as a member functioning as a part of a component member provided on the pole base side in the height control mechanism;
A state is established in which the engaging groove 46b formed in the boss portion of the gear 46 used as a member functioning as a component member provided on the fixed portion side in the height control mechanism is engaged.

The engaging portion 54a formed at the tip of the lower flange 54 has a V-shaped cross section, and engages with the engaging portion 54a formed at the tip of the lower flange 54. The engaging groove 46b has a V-shaped cross-sectional shape that matches the V-shaped cross-sectional shape of the engaging portion 54a. Therefore, immediately before the magnetic recording / reproducing apparatus completes the loading operation, the lower flange 5 is closed.
4 from the state in which the engaging portion 54a formed at the tip of the gear 4 and the engaging groove 46b formed in the boss portion of the gear 46 have begun to engage until the loading operation is completed. The engaging operation is performed well.

When the magnetic recording / reproducing apparatus of the present invention shown in FIG. 15 starts the recording / reproducing operation and rotates the motor Mg after the loading operation by the loading mechanism is completed, the gears 18 and 19 of the power transmission mechanism described above. , 20, the gear 46 rotates. When the gear 46 rotates, the screw 47g screwed below the rotation shaft 47 of the gear 46 rotates in a state of being screwed into the female screw 53g screwed to the protrusion 53 of the drum base DB. Meanwhile, the rotation shaft 47 of the gear 46 moves upward or downward according to the rotation direction.

When the rotation shaft 47 of the gear 46 rotates, the position sensor P mounted on the rotation shaft 47
The light shielding plate 13 of S rotates and the position signal is output from the photo interrupter 24 of the position sensor PS. Further, with the rotation of the rotating shaft 47 of the gear 46, the rotating shaft 47 is rotated.
Is moved upward and downward, the engaging portion 54a formed at the tip of the lower flange 54 engaged with the engaging groove 46b formed in the boss portion of the gear 46 also moves to the rotating shaft 47. It moves upward and downward as it moves upward and downward. Therefore, the guide pole GP moves upward and downward by the rotation of the motor Mg.

FIG. 18A is a side view of the pole base PB in the magnetic recording and reproducing apparatus shown in FIG. 16, and FIG. 18B is a side view of FIG. a) An engaging portion 54b formed at the tip of the lower flange 54 shown in the figure, and a gear 4 in a height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus.
6 is a partial cross-sectional view illustrating the state of engagement with the distal end of a screw 52g provided near the upper end of the rotary shaft 52. FIG. 18 (c) is the lower part of FIG. 18 (a). It is a top view of an end part. In FIG. 18, reference numeral 5 denotes a shaft of a guide pole GP. The shaft 5 of the guide pole is inserted into a hole whose lower portion is formed in the pole base PB. The sliding can be performed in a state where the moving direction is guided on the wall surface of the hole.

In FIG. 18, reference numeral 11 denotes an upper flange fixed to the guide pole shaft 5, and reference numeral 12 denotes a roller having a length equal to the width of the magnetic tape T. Numeral 54 denotes a lower flange. The lower flange 54 has a screw provided near the upper end of the rotating shaft 52 of the gear 46 in the height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus. Engaging part 54 that can engage with the tip of 52g
b is formed. The tip of a screw 52g provided near the upper end of the rotating shaft 52 of the gear 46 in the height control mechanism on the lower surface of the engaging portion 54b of the lower flange 54 during the loading operation is easily provided on the engaging portion 54. An inclined portion 54b1 is provided to enable engagement. A stopper 60 is fixed to the lower end of the shaft 5 of the guide pole. The stopper 60 is provided with protrusions 60a and 60b for stopping rotation.

The lower end of the shaft 5 of the guide pole and the stopper 60 protrude into a cavity 59 provided in the pole base PB. The protrusions 60a and 60b for stopping rotation are connected to the pole base PB. Are loosely fitted in the slits 61 and 62 provided in the first and second slits. Reference numeral 56 denotes a spring provided between the upper surface of the stopper 60 and the upper wall of the hollow portion 59 provided in the pole base PB, and the guide pole GP is always controlled by the spring 56. It is urged to be pulled downward. A screw 52g is screwed on an outer peripheral surface of a portion above the rotation shaft 52 of the gear 46, and the screw 52g is screwed to a female screw 53g screwed to the protrusion 53 of the drum base DB. .

When the magnetic recording / reproducing apparatus changes from a state in the middle of the loading operation illustrated in FIG. 16 to a state in which the loading operation is completed (not shown), the tip of the pole base PB as described above. However, in combination with the base catcher BC, the pole base PB is set to a spatial position having a predetermined positional relationship with respect to the fixed portion of the body of the magnetic recording / reproducing apparatus. When the magnetic recording / reproducing device has completed the loading operation,
A lower surface of an engaging portion 54b formed at a tip of a lower flange 54 used as a member functioning as a part of a component provided on a pole base side in the height control mechanism, and a fixed portion in the height control mechanism Gear 46 used as a member functioning as a constituent member provided on the side
And the tip of the screw 52g in the upper part of the rotary shaft 52 is engaged.

When the magnetic recording and reproducing apparatus of the present invention shown in FIG. 16 starts the recording and reproducing operation and rotates the motor Mg after the loading operation by the loading mechanism is completed, the gears 18 and 19 of the power transmission mechanism described above. , 20, the gear 46 rotates. When the gear 46 rotates, the screw 52g screwed above the rotation shaft 52 of the gear 46 rotates in a state of being screwed into the female screw 53g screwed to the protrusion 53 of the drum base DB. Meanwhile, the rotation shaft 52 of the gear 46 according to the rotation direction,
Move up or down.

When the rotating shaft 52 of the gear 46 rotates, the position sensor P attached to the lower portion of the rotating shaft 52
The light shielding plate 13 of S rotates and the position signal is output from the photo interrupter 24 of the position sensor PS. Also, with the rotation of the rotation shaft 52 of the gear 46, the rotation shaft 52
When the shaft moves upward and downward, the engaging portion 54b formed at the tip of the lower flange 54 also moves upward and downward with the above-described upward and downward movement of the rotary shaft 52. Therefore, the guide pole GP moves upward and downward by the rotation of the motor Mg.

Next, a configuration example illustrated in FIG. 19 will be described. Guide pole GP shown in FIG.
Is a configuration in which an inclined surface 11b is formed on the upper surface of the upper flange 11 of the guide pole GP described above with reference to FIG. In the configuration example illustrated in FIG. 19, when the magnetic recording / reproducing device completes the loading operation, the inclined surface 11b on the upper surface of the upper flange 11 of the guide pole GP is provided on the fixed portion side of the height control mechanism. The engaging inclined surface 63a of the engaging member 63 provided on the rotating shaft 47 of the gear 46 used as a member functioning as a constituent member.

When the motor 46 is rotated through the gears 18, 19, 20 of the power transmission mechanism when the motor Mg rotates after the recording / reproducing operation starts, the motor Mg is screwed below the rotating shaft 47 of the gear 46. Screw 47g is drum base DB
The engagement member 63 provided on the rotating shaft 52 of the gear 46 moves upward or downward according to the rotation direction in order to rotate in a state of being screwed into the female screw 53g screwed into the projecting portion 53 in FIG. I do. Thereby, the engagement member 6
As it moves upward or downward, the guide pole GP moves upward and downward due to the rotation of the motor Mg.

Next, FIGS. 20 and 21 show examples of the configuration of components used as a part of the components provided on the fixed portion side in the height control mechanism. 20 and 21 can be used, for example, for controlling the height of the guide pole GP having the configuration described above with reference to FIG. First, in the constituent members shown in FIG. 20, 53 is a protruding portion in the drum base DB, and 64 is an L-shaped bracket. A hole 65 provided in a lower portion of the L-shaped bracket 64;
The L-shaped bracket 64 is combined with the protruding portion 53 of the drum base DB so that the holes 70 and 71 provided in the holes communicate with each other. Then, the pin 69 is inserted. Thus, the L-shaped bracket 64 is rotatably coupled to the projecting portion 53 of the drum base DB around the pin 65 as a rotation axis.

Reference numeral 46 in FIG. 20 is a gear corresponding to the gear 46 shown in FIGS. A light-shielding plate of the position sensor PS is fixed to one end of the rotation shaft 47 of the gear 46. In addition, the aforementioned rotary shaft 4
At the other end of the screw 7, a screw 47 g is screwed. After the screw 47g is inserted into the spring, the female screw 68 screwed into the protruding portion 53 of the drum base DB.
Screw. Screw 47 of the rotating shaft 47 of the gear 46
When g rotates while being screwed into the female screw 68 screwed into the protrusion 53 of the drum base DB, L is rotatably coupled to the protrusion 53 of the drum base DB. The mold bracket 64 rotates about the pin 69 as a rotation axis, whereby the distal end portion 64a of the L-shaped bracket 64 moves back and forth.

When the magnetic recording / reproducing apparatus has completed the loading operation, the lower flange 54 in FIG. 18 used as a member functioning as a part of the component provided on the pole base side in the height control mechanism is set. The lower surface of the engaging portion 54b formed at the distal end and the distal end portion 6 of the L-shaped bracket 64 used as a member functioning as a component member provided on the fixed portion side in the height control mechanism.
4a is engaged.

Then, after the loading operation by the loading mechanism is completed, when the recording / reproducing operation is started and the motor Mg is rotated, the gear 46 is rotated via the gears 18, 19 and 20 of the power transmission mechanism as described above. The screw 47g of the rotating shaft 47 of the gear 46 is connected to the drum base DB.
When rotated in a state of being screwed into the female screw 68 screwed into the protruding portion 53, the engaging portion formed at the distal end of the lower flange 54 in contact with the surface of the distal end portion 64a of the L-shaped bracket 64 54b also moves upward and downward. Therefore, the guide pole GP moves upward and downward by the rotation of the motor Mg. Also,
When the gear 46 rotates, the rotation shaft 47 of the gear 46 rotates, so that the light shielding plate 13 of the position sensor PS attached to the lower portion of the rotation shaft 52 rotates, and A signal is output.

Next, in the components shown in FIG. 21, reference numeral 53 denotes a projecting portion on the drum base DB.
3 is a rack plate. 73L is a rack provided on the rack plate 73. The light shielding plate 13 of the position sensor is also attached to the rack plate 73. An inclined surface 74 is formed at an end of the upper surface of the rack plate 73. The upper surface of the rack plate 73 functions as a component provided on the fixed portion side of the height control mechanism. 2
Reference numeral 4 denotes a photo interrupter of the position sensor PS.
The rack plate 73 is slidably attached to a concave portion 75 (see FIG. 21B) of the projecting portion 53 of the drum base DB. The rack plate 73 of the rack plate 73
A pinion 72 is meshed with L. The gear 19 is attached to the rotation shaft 21 of the pinion 72.

Further, the gear 18 has a structure shown in FIG.
As shown in the figure, the gear is meshed with a gear 18 attached to the rotating shaft 15 of the motor Mg. A light-shielding blade 16 that forms part of the rotary encoder RE is also attached to the rotation shaft 15 of the motor Mg. Reference numeral 17 denotes a photo interrupter which forms a part of the rotary encoder RE. When the magnetic recording / reproducing device has completed the loading operation, a member formed at the tip of the lower flange 54 in FIG. The lower surface of the joint portion 54b and the upper surface of the rack plate 73 used as a member provided as a component provided on the fixed portion side of the height control mechanism are engaged.

Then, after the loading operation by the loading mechanism is completed, when the recording / reproducing operation is started and the motor Mg is rotated, the pinion 72 is rotated via the gears 18 and 19 of the power transmission mechanism as described above. The rack 73 that engages with the pinion 72 moves upward and downward.
Accordingly, the engaging portion 54b formed at the tip of the lower flange 54 that is in contact with the upper surface of the rack plate 73 used as a member that functions as a component provided on the fixed portion side of the height control mechanism is also provided. , Move up and down. Therefore, the guide pole GP moves upward and downward by the rotation of the motor Mg.
When the pinion 72 rotates and the rack 73 meshing with the pinion 72 moves upward and downward, the rack plate 7
The light shielding plate 13 of the position sensor PS attached to the position sensor 3 also moves, and a position signal is output from the photo interrupter 24 of the position sensor PS.

The recording operation and the reproducing operation in the magnetic recording and reproducing apparatus of the present invention described with reference to FIGS. 15 to 21 and the standard height of the guide pole GP performed by using a standard tape at the time of manufacturing the magnetic recording and reproducing apparatus. The operation of setting the height is the same as that described above with reference to FIGS. 1 to 10, and a detailed description thereof is omitted.
Also in the magnetic recording / reproducing apparatus of the present invention described with reference to FIGS. 5 to 21, during the recording operation of the magnetic recording / reproducing apparatus, each guide pole If the height position of the GP is set, the height position of each guide pole GP is set to a predetermined regular height for ensuring compatibility of the recording / reproducing operation, and the recording operation and the reproducing operation are performed. It works well.

[0097]

As is apparent from the above description, in the magnetic recording / reproducing apparatus of the present invention, the loading mechanism operates to move the magnetic tape from the cassette position to the drum structure in a predetermined moving path. When the tip of the pole base moving along is positioned by engagement with the base catcher provided corresponding to the pole base when the loading operation is completed, the tip of the pole base is provided on the pole base. The driven gear of the pole base-side height control mechanism provided for changing the height of the guide pole is a drive gear of the height control mechanism provided on the fixed part side of the body of the magnetic recording / reproducing apparatus. The guide surfaces of the guide poles are completely engaged with the magnetic recording / reproducing device to ensure recording / reproducing compatibility. Corresponding to the state of being at the predetermined regular height position, after the light shielding plate of the position sensor is mounted on the guide pole so as to be in the reference rotation position, an external force acting as a disturbance is applied to the guide pole. In order to prevent the guide pole from rotating even if it is applied, the screw connection used for the displacement of the guide pole is set in a tightly screwed state without play, and external force that becomes a disturbance is applied to the guide pole. In addition, even if the guide pole rotates, it cannot be rotated more than one rotation by a stopper provided in the movement path of the light shielding plate in the position sensor, and further, a long hole provided in the light shielding plate in the position sensor. By fixing the light shielding plate with a screw so as to be a reference rotation position, the light shielding plate of the position sensor with respect to the guide pole,
A guide pole provided on a pole base moving along a predetermined moving path from the position of the cassette of the magnetic tape to the position of the drum assembly can be easily attached to the state of the reference rotation position. By adopting a configuration in which the height position of the guide pole does not change even when rotated by an external force, the winding of the magnetic tape to be wound around a part of the drum circumferential surface on the drum circumferential surface is started. 1 and 2 provided on a pole base of a loading mechanism that is individually arranged in the traveling path between the side and the end side of the winding.
The height of the second guide pole is determined based on the read signal from the magnetic tape, and the information on the curvature of the recording trace at a position near the first guide pole and the position at the position near the second guide pole. The guide pole is changed by a height control signal generated by using the bending information of the recording trace so that the closed loop automatic control operation for aligning the recording trace of the magnetic tape with the rotation locus of the rotary magnetic head is performed. A magnetic sensor having a height control mechanism including a position sensor and a rotary encoder for generating information relating to the height of the magnetic disk, and a drive source and a power transmission mechanism provided on a fixed portion of a body of the magnetic recording and reproducing apparatus. The recording / reproducing apparatus is related to a magnetic recording / reproducing apparatus for ensuring recording / reproducing compatibility by performing the closed loop automatic control operation even during a recording operation. The height position of the normal which is determined in advance, since the height position of the guide surface is automatically set, the conventional problems described above by the present invention can be satisfactorily resolved, also,
Since the mounting of the light shielding plate of the position sensor is easy, the number of manufacturing steps is small, and the light shielding plate of the sensor that enters the tape cassette,
By reducing the diameter of the driven gear provided on the pole base of the loading mechanism, there is obtained an advantage that the magnetic tape is not damaged when the tape cassette is attached or detached.

[Brief description of the drawings]

FIG. 1 is a perspective view of a part of a magnetic recording / reproducing apparatus according to an embodiment of the present invention during a loading operation.

FIG. 2 shows a state in which a loading operation is completed.
1 is a perspective view of a part of the magnetic recording and reproducing apparatus of the present invention shown in FIG.

FIG. 3 is a diagram for explaining a guide pole provided on a pole base.

FIG. 4 is a diagram for explaining the operation of the position sensor.

FIG. 5 is a diagram for explaining a guide pole provided on a pole base.

FIG. 6 is a diagram illustrating a guide pole provided on a pole base.

FIG. 7 is a diagram illustrating a guide pole provided on a pole base.

FIG. 8 is a diagram for explaining a guide pole provided on a pole base.

FIG. 9 is a diagram for explaining a guide pole provided on a pole base.

FIG. 10 is a diagram illustrating a configuration of a gear.

FIG. 11 is a perspective view of a part of another magnetic recording / reproducing apparatus of the present invention during a loading operation.

FIG. 12 is a perspective view of a part of another magnetic recording / reproducing apparatus of the present invention during a loading operation.

FIG. 13 is an explanatory diagram of a configuration example of a light shielding plate of the position detector.

FIG. 14 is a diagram for explaining a configuration example of a light shielding plate of the position detector.

FIG. 15 is a perspective view of a part of another magnetic recording / reproducing apparatus of the present invention during a loading operation.

FIG. 16 is a perspective view of a part of another magnetic recording / reproducing apparatus of the present invention during a loading operation.

FIG. 17 is a diagram for explaining a guide pole provided on a pole base.

FIG. 18 is a diagram for explaining a guide pole provided on a pole base.

FIG. 19 is a diagram for explaining a guide pole provided on a pole base.

FIG. 20 is a perspective view showing a configuration example of a height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus.

FIG. 21 is a perspective view showing a configuration example of a height control mechanism provided on a fixed portion side of the body of the magnetic recording / reproducing apparatus.

FIG. 22 is a diagram for explaining a problem of the magnetic recording / reproducing device.

[Explanation of symbols]

DB: drum base, Dd: lower drum, Du: upper drum, H: rotary magnetic head, BC: base catcher,
DA: drum structure, PB: pole base, Md: drum drive] motor, Mg: motor, GP: guide pole, S
P: inclined pole, T: magnetic tape, RE: rotary encoder, PS: position sensor, 5: guide pole shaft, 7, 54, ... lower flange, 7g, 37g: driven gear, 18, 19, 20, 46 ... Gears, 10 ... elastic body, 1
DESCRIPTION OF SYMBOLS 1 ... Upper flange, 12 ... Roller, 13 ... Light shielding plate, 15 ...
Rotary axis of motor Mg, 16 ... Rotary encoder RE
, A photo interrupter, 22, a drive gear, 30, 36, 43, 5
6, 66 ... spring, 39, 40, 61, 62 ... slit, 46b ... engagement groove of the gear 46, 53 ... protrusion of the drum base, 54a, 54b ... engagement part provided on the lower flange 54, 64 ... L Mold bracket, 72 ... pinion, 73 ...
Rack plate, 73L ... rack,

Claims (13)

[Claims] 1. A magnetic recording / reproducing apparatus, which is wound around a part of a drum peripheral surface by a rotary magnetic head provided so that a rotational trajectory surface is formed at a predetermined position with respect to a fixed portion of a body of a magnetic recording / reproducing apparatus. The recording and reproducing operations for the magnetic tape are performed, and the magnetic tape to be wound around a part of the drum peripheral surface is individually moved along the running path between the winding start side and the winding end side around the drum peripheral surface. A recording mark at a position close to the first guide pole obtained based on a reproduction signal from a magnetic tape by setting heights of first and second guide poles provided on a pole base of a loading mechanism to be arranged. Of the magnetic tape on the rotation locus of the rotary magnetic head by changing the height control signal generated by using the bending information of the rotating magnetic head and the bending information of the recording trace at a position near the second guide pole. A position sensor and a rotary encoder for generating information on the height of the guide pole, and a drive source and a power transmission provided on a fixed portion of the body of the magnetic recording / reproducing apparatus so that a closed loop automatic control operation for adjusting the recording is performed. A magnetic recording / reproducing apparatus including a height control mechanism configured to include a mechanism, provided on a pole base provided in the loading mechanism, and when the loading operation is completed, the magnetic recording / reproducing apparatus includes: The driven gear in the height control mechanism provided on the loading pole side engaged with the drive gear of the power transmission system in the height control mechanism provided on the fixed part side of the fuselage, and the rotation of the driven gear described above The movable member of the position sensor attached to the rotating shaft that changes the height of the guide pole and the fixed part of the body of the magnetic recording and reproducing device Magnetic recording and reproducing apparatus be provided, comprising a fixing member position sensor that generates a position detection signal by detecting the state of displacement of the movable member of said position sensor to. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the guide pole provided on the pole base is prevented from rotating beyond a predetermined angle by a stopper. 3. The magnetic recording and reproducing apparatus according to claim 1, wherein the driven gear in the height control mechanism provided on the loading pole side has a diameter smaller than a diameter of a guide pole flange. 4. A movable member of a position sensor provided on a pole base side is a light shielding plate, and is provided on a fixed portion side of a body of the magnetic recording / reproducing apparatus, and controls a rotating state of the movable member of the position sensor. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the fixing member of the position sensor that detects and generates a position detection signal is a photo interrupter. 5. The magnetic recording / reproducing apparatus according to claim 1, wherein the light shielding plate of the position sensor is provided so that the mounting phase in the rotation direction thereof can be adjusted. 6. The magnetic recording apparatus according to claim 1, wherein the mounting portion of the light shielding plate of the position sensor is formed of an elastic body, and the mounting portion of the light shielding plate is press-fitted and fixed to a small diameter portion of the upper flange of the guide pole. Playback device. 7. The magnetic recording apparatus according to claim 1, wherein the mounting portion of the light shielding plate of the position sensor is formed of an elastic body, and the mounting portion of the light shielding plate is press-fitted and fixed to the inner diameter portion of the upper flange of the guide pole. Playback device. 8. The magnetic recording / reproducing apparatus according to claim 1, wherein the mounting portion of the light shielding plate of the position sensor is formed of an elastic body, and the mounting portion of the light shielding plate is press-fitted and fixed to the shaft of the guide pole. 9. The magnetic recording / reproducing apparatus according to claim 1, wherein the light shielding plate of the position sensor has a diameter smaller than the diameter of the guide pole flange. 10. The magnetic recording / reproducing apparatus according to claim 1, further comprising a preload means for preventing backlash of a screw provided on a rotating shaft for changing the height of the guide pole in accordance with the rotation of the driven gear. apparatus. 11. When the loading operation is completed, a height provided on a loading pole side engaged with a drive gear of a power transmission system in a height control mechanism provided on a fixed portion side of the body of the magnetic recording / reproducing apparatus. The driven gear in the control mechanism, and corresponding to the rotation of the driven gear, the position of the guide surface in the axial direction within the range of a predetermined upper portion and a lower portion with respect to the reference position of the guide surface. 2. The magnetic recording / reproducing apparatus according to claim 1, further comprising a guide pole that is displaced so as to be changeable. 12. A magnetic recording / reproducing apparatus, which is wound around a part of a drum peripheral surface by a rotary magnetic head provided so that a rotational trajectory surface is formed at a predetermined position with respect to a fixed portion of a body of a magnetic recording / reproducing apparatus. The recording and reproducing operations for the magnetic tape are performed, and the magnetic tape to be wound around a part of the drum peripheral surface is individually moved along the running path between the winding start side and the winding end side around the drum peripheral surface. A recording mark at a position close to the first guide pole obtained based on a reproduction signal from a magnetic tape by setting heights of first and second guide poles provided on a pole base of a loading mechanism to be arranged. Of the magnetic tape by the height control signal generated using the bending information of the rotating magnetic head and the bending information of the recording trace at a position near the second guide pole. A position sensor and a rotary encoder for generating information on the height of the guide pole, and a drive source and power transmission provided on a fixed portion of the body of the magnetic recording and reproducing apparatus so that a closed loop automatic control operation for adjusting the recording trace is performed. A magnetic recording / reproducing apparatus having a height control mechanism including a mechanism, wherein a reference edge of the magnetic tape at a winding start portion and a winding end portion of the magnetic tape on the drum peripheral surface is set on the drum peripheral surface. The spatial position of the guide surfaces of the first and second guide poles in a state where they can be matched with the guide portion with respect to the reference edge of the magnetic tape provided in the vicinity is determined by the guide surfaces of the first and second guide poles. When the reference position is assumed to be the reference position, the guide in the axial direction within the range between the upper portion and the lower portion that are predetermined with respect to the reference position of the guide surface described above. The first and second guide poles are provided on a pole base provided in the loading mechanism in a state where the position of the surface can be changed, and upon completion of the loading operation, the pole base and the body of the magnetic recording / reproducing apparatus are moved. When the fixed portion is coupled, the component of the height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus in the above-described height control mechanism, and the height provided on the pole base side Means for engaging the components of the control mechanism with the first and second
Means for adjusting and setting by operation of a closed loop automatic control system such that the position of the guide surface of the guide pole coincides with the above-mentioned reference position. 13. A change in the position of the guide surface in the axial direction within a range between a predetermined upper portion and a lower portion with respect to the reference position of the guide surface is free under the bias of the spring. The guide pole is slidably provided on a pole base provided in the loading mechanism, and when the above-mentioned pole base and the fixed portion of the body of the magnetic recording / reproducing apparatus are coupled by the completion of the loading operation, the height of the above-mentioned height is increased. The components of the height control mechanism provided on the fixed portion side of the body of the magnetic recording / reproducing apparatus in the control mechanism are engaged with the components of the height control mechanism provided on the pole base side. 13. The magnetic recording / reproducing apparatus according to claim 12, wherein: