JP2556286B2 - Magnetic recording / reproducing device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary magnetic head by changing the spatial position of the rotary locus surface of a rotary magnetic head in response to a change in the running speed of a magnetic tape which runs in sliding contact with a part of the peripheral surface of a drum. The present invention relates to a magnetic recording / reproducing device in which a head can track a recording trace well.

[0002]

2. Description of the Related Art A magnetic tape wound around a part of a peripheral surface of a drum composed of an upper drum and a lower drum is run at a predetermined running speed, and a recording / reproducing operation is performed by using a rotary magnetic head. A video tape recorder (VTR) is a typical example of such a magnetic recording / reproducing apparatus. In using the VTR, in addition to the normal reproduction (normal reproduction) in which the recording information is reproduced at the same magnetic tape traveling speed as during recording, the traveling is different from the traveling speed or traveling direction of the magnetic tape during recording. Trick play in which a magnetic tape is run (including stop) at a speed or a running direction to perform a reproducing operation is also widely used.

Incidentally, the recording trace pattern (tape pattern or track pattern) recorded and formed on the magnetic tape in correspondence with the rotation locus of the rotary magnetic head is shown, for example, in FIG. 24 as the traveling speed of the magnetic tape is different. Will be different as you are. In FIG. 24, it corresponds to the portion where the lower edge Te of the magnetic tape T in the figure is designated as the starting point by an arrow and the portion of "Normal + 1- + 3-" written above the upper edge of the magnetic tape. A straight line connecting the points and a number of straight lines parallel to the straight line were used to perform a reproducing operation by running the magnetic tape at the same running speed and running direction as the running speed and running direction of the magnetic tape during recording. When [Normal recording / playback (normal recording / playback) ... S
In the P mode, the rotation locus of the rotary magnetic head drawn on the magnetic tape T is +1 and in the EP mode is +3], and in FIG.
And the straight line drawn when the starting point is connected to the position of each point described as the double speed number +6, +9 ... +21 in the EP mode is the running direction of the magnetic tape T at the time of recording. In the same direction (the running direction of the magnetic tape T at the time of recording is indicated by a + sign), the running speed of the magnetic tape T at the time of recording is twice, three times ... 6) of the running speed of the magnetic tape T during recording)
Double, 9 times ... 21 times the running speed (in EP mode),
When the magnetic tape T is run and the reproducing operation is performed (S
2 times speed, 3 times speed ... 7 times speed in P mode, 6 times speed, 9 times speed ... 21 times speed in EP mode)
The rotation locus of the rotary magnetic head drawn on the magnetic tape T is shown. Note that, in FIG. 24, the recording traces in the SP mode and the recording traces in the EP mode are illustrated as being in parallel with each other in order to avoid the complication of the drawing, but in actuality in the EP mode. The recording trace of is not parallel to the recording trace in SP mode.

Further, in the SP mode shown in FIG.
The positions of the points described as 2, -3 ...- 7, and the straight lines connecting the starting points with -6, -9 ...- 21 in the EP mode are the running directions of the magnetic tape T during recording. 2 times, 3 times ... 7 times the running speed of the magnetic tape T at the time of recording in the opposite direction (the running direction of the magnetic tape T at the time of recording is indicated by a minus sign). 6) of the running speed of the magnetic tape T during recording)
Double, 9 times ... 21 times (in EP mode) running speed,
When the reproducing operation is performed while the magnetic tape T is running, the rotation locus of the rotary magnetic head drawn on the magnetic tape T is shown. Note that, in FIG. 24, the straight line connecting the above-mentioned starting point and the point corresponding to the portion of “still image 0-0-.” Described above the upper edge side of the magnetic tape T in the figure is the magnetic line. The rotational locus of the rotary magnetic head drawn on the magnetic tape T when the reproducing operation is performed (still reproduction) while the tape T is stopped is shown.

When the magnetic recording / reproducing apparatus is constructed so as to be continuously reproducible in the standard mode of the VHS (registered trademark) system, the rotary magnetic head mounted on the rotary drum having a diameter of 62 mm is rotated at 1800 rpm. Then, when the recording / reproducing operation is performed with the magnetic tape wound around a part of the outer periphery of the drum being transported at a feeding speed of 33.35 mm / sec, the rotary magnetic head described above draws on the magnetic tape T. The recorded trace (rotational track of the rotating magnetic head) shows an angle of 5 ° 58′9.9 ″ with respect to the reference edge Te of the magnetic head T (the video track angle when the magnetic tape T is running is … 5 ° 5
8′9.9 ″}, and in the VHS (registered trademark) system described above, the video track angle when the magnetic tape T is stopped and being reproduced is 5 ° 5.
6'7.4 ", and, for example, the position of the upper edge of the magnetic tape T indicated by +7 in the SP mode shown in FIG. 24 and the indication by +21 in the EP mode. The straight line connecting the position of the upper edge of the magnetic tape T and the starting point is the reference edge T of the magnetic head T.
The angle of 6 ° 10'54 "with respect to e is shown, and further, for example, the position of the upper edge of the magnetic tape T indicated by the display of -7 in the SP mode in FIG. The straight line connecting the position of the upper edge of the magnetic tape T and the starting point, which is indicated by the display of −21 in 5 °, is 5 ° 42′25.7 ″ with respect to the reference edge Te of the magnetic head T.
Will indicate the angle of.

As is apparent from the recording trace pattern shown in FIG. 24, the rotary magnetic head drawn on the magnetic tape T by the rotary magnetic head during normal recording / reproducing (normal recording / reproducing). The rotational locus of No. 1 and the rotational locus of the rotary magnetic head drawn on the magnetic tape T by the rotary magnetic head during trick play intersect. Therefore, the signal level of the frequency-modulated wave signal of the reproduction signal reproduced during trick play changes greatly every time the rotary magnetic head crosses the recording mark.
Looking at the envelope of the frequency-modulated wave signal of the reproduction signal in the vertical scanning period, a large undulation occurs in one vertical scanning period. Therefore, as a reproduced image at the time of trick play, only a reproduced image of poor quality in which a noise bar is generated in the image can be obtained. In particular, in the consumer digital VTR, since the data amount of the video signal is compressed and recorded by the high-efficiency encoding method, the rotary magnetic head is used for the magnetic tape T such as during fast-forward reproduction and rewind reproduction. When a playback operation is performed across the recording trace,
An image may not be reproduced at all depending on the arrangement state of the blocks of data arranged in a mosaic pattern.

Recently, three recording traces having a recording trace width of 19 μm are simultaneously recorded in parallel on the magnetic tape T to form a recording trace pattern as shown in FIG. A new form of VTR has been proposed in which it is possible to record and reproduce so-called high-definition image information by forming the VTR. In the 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 two rotating magnetic heads having azimuth angles opposite to each other. Is used for recording / reproducing an image signal, and the remaining one recording mark is used for recording / reproducing an audio signal by another rotating magnetic head.

FIG. 25 (a) shows the movement locus of the rotary magnetic head when the reproducing operation from the recorded magnetic tape recorded by the new type VTR as described above is the fast-forward reproducing operation or the rewinding reproducing operation. ), The position of the upper edge of the magnetic tape T indicated by the numeral +7 or -7 described above the upper edge of the magnetic tape T in the figure. The two rotating magnetic heads for images, which have different azimuth angles, perform the reproducing operation across the three recording marks formed on the magnetic tape T. Therefore, the image reproduced will be full of noise bars.

In order to solve the above-mentioned problems, it suffices that the rotation trace of the rotary magnetic head and the recording trace of the magnetic tape T coincide with each other. As a conventional actuator in an open loop control circuit or a closed loop control circuit. A rotary magnetic head is attached to the electro-mechanical conversion element to be used, and the rotary magnetic head is displaced by the electro-mechanical conversion element so that the rotary magnetic head can be traced on the recording trace of the magnetic tape T. Kosho 63-34126
As disclosed in Japanese Laid-Open Patent Publication No. 61-158633 and Japanese Laid-Open Utility Model Publication No. 61-158633, the rotary head and the lower drum are integrally tilted so that the rotary head records a recording mark on the magnetic tape T. It is possible to trace it, or, for example, as disclosed in Japanese Patent Publication No. 61-22376,
The rotary head changes the height of guides for limiting the height in the width direction of the magnetic tape provided on the entrance side of the magnetic tape with respect to the drum and the removal side of the magnetic tape from the drum. Various solutions have been proposed, such as enabling traceability of recorded traces.

[0010]

However, in the VTR in which the electro-mechanical conversion element used as an actuator is used to control the rotational locus of the rotary magnetic head as described above, the rotary locus of the rotary magnetic head is controlled. Since the electro-mechanical conversion element for controlling the electro-mechanical conversion element must be provided in a narrow space inside the rotating drum, the electro-mechanical conversion element to be used needs to have a small geometrical size. It is difficult for the electro-mechanical conversion element to give a large displacement to the rotary magnetic head, and the rotary magnetic head displaced by the electro-mechanical conversion element does not cause a poor head touch condition with respect to the magnetic tape even when the rotary magnetic head is displaced. However, a small actuator that exhibits good operating characteristics should be used for good recording and reproducing. It is difficult to configure a VTR that operates, and it is difficult to accurately track the rotary magnetic head with respect to a recording trace having a small recording trace width in a magnetic recording medium in which high density recording is performed. There is a problem such as.

In addition, the rotary drum and the lower drum described above are integrally tilted so that the rotary head has the magnetic tape T.
In the magnetic recording / reproducing apparatus disclosed in Japanese Utility Model Publication No. 63-34126, among the magnetic recording / reproducing apparatus capable of tracing the recording trace of the magnetic tape T, the guide portion of the reference edge Te of the magnetic tape T is the magnetic tape T. Since it is only in contact with the reference edge Te of (1) in a state similar to a point contact,
When the position of the reference edge Te of the magnetic tape T is largely swung, and the magnetic tape T is recorded at a low recording density, that is, when the recording trace width is large, it is normal. Even if you can barely play it well,
At the time of trick play, since the magnetic tape T is running in a state in which the position of the reference edge Te of the magnetic tape is not correctly guided by the guide portion, the magnetic tape T is in a state of running, and therefore in both cases of fast forward reproduction and rewind reproduction. However, the problem is that the noise bar cannot be removed well.

Further, in the magnetic recording / reproducing apparatus in which the rotary drum and the lower drum are integrally tilted so that the rotary head can trace the recording traces of the magnetic tape T, in the above-mentioned actual development, Sho 61-158633. In the magnetic recording / reproducing apparatus disclosed in the publication, a member (guide portion) that can guide a portion of a predetermined length on the reference edge of the magnetic tape that is formed separately from the lower drum is fixed to the fixed portion of the apparatus. Therefore, the change in the position of the reference edge Te of the magnetic tape T, which occurs in the magnetic recording / reproducing apparatus disclosed in Japanese Utility Model Publication No. 63-34126, can be prevented from occurring at least during the normal reproducing operation. However, when the rotating drum and the lower drum to which the magnetic head is attached are integrally tilted in order to perform the fast-forward reproduction operation or the rewind reproduction operation, the magnetic tape The magnetic tape T running in a state of sliding contact with the sliding contact surface of the lower drum has a sliding contact surface with Since it has a tendency to incline with the lower drum, the reference edge Te of the magnetic tape T is moved from a member (guide portion) for guiding the reference edge Te of the magnetic tape T with the inclination of the upper and lower drums. Displacement occurs in the away direction. Therefore, in order to perform the fast-forward reproduction operation or the rewind reproduction operation, etc., when the rotary drum having the magnetic head attached and the lower drum are integrally tilted, the above-mentioned upper and lower drums are tilted, A portion in a state where the reference edge Te of the magnetic tape T is not guided by the above-mentioned member (guide portion) for guiding the reference edge Te of the magnetic tape T is generated, and the position of the reference edge Te of the magnetic tape T in that portion. May fluctuate and generate a noise bar.

That is, when the above-mentioned VHS (registered trademark) VTR is performing the recording / reproducing operation in the SP mode and the recording trace width of the recording trace of the magnetic tape T is relatively large, such as 58 μm. In order to perform a fast-forward reproduction operation, a rewind reproduction operation, or the like, when a rotating drum having a magnetic head attached and a lower drum are integrally tilted, a part of the reference edge Te of the magnetic tape T is magnetized. Even if there is a portion that is not guided by the member (guide portion) for guiding the reference edge Te of the tape T, and the position of the reference edge Te of the magnetic tape T at that portion changes, it will still occur in the reproduced image. Although a noise bar is hardly generated, for example, when the VHS (registered trademark) VTR described above is performing the recording / reproducing operation in the EP mode, the recording trace width of the recording trace of the magnetic tape T is For example, when the rotating drum to which the magnetic head is attached and the lower drum are integrally tilted in order to perform a fast-forward reproducing operation, a rewinding reproducing operation, or the like when the size is as small as 19 μm, the reference edge of the magnetic tape T is formed. T
If a portion in a state not being guided by a member for guiding e (guide portion) occurs on a part of the reference edge Te of the magnetic tape T, the position of the part changes and the reproduced image is reproduced. Was found to cause noise bars.

The above problem is that three recording marks having a recording mark width of 19 μm are simultaneously recorded in parallel on the magnetic tape T,
It goes without saying that the same applies to the VTR of the above-described new form in which the recording trace pattern as shown in FIG. 25A is formed on the magnetic tape T.
Therefore, a solution to the above-mentioned problems was sought.

[0015]

The present invention has been made in view of the above problems, and the invention according to claim 1 is
In a magnetic recording / reproducing apparatus in which a rotating magnetic head is used to perform recording / reproducing operation on a magnetic tape wound around a part of the peripheral surface of a drum structure including an upper drum and a lower drum, The reference edge of the magnetic tape so that the recording axis formed on the magnetic tape and the rotational locus surface of the rotary magnetic head are aligned with the central axis of the upper drum having the contact surface and the rotary magnetic head. First tilting drive means for tilting with respect to the central axis of the lower drum, which has a magnetic tape position regulating guide portion for regulating the position of the magnetic tape, and a sliding contact surface of the magnetic tape, and the position of the magnetic tape on the lower drum. A magnetic recording / reproducing apparatus provided with a second tilt drive means for tilting the lower drum so that the regulation guide portion is in a state of being aligned with the position of the reference edge of the magnetic tape. "

According to a second aspect of the invention, "the first tilt drive means includes a first rotation fulcrum for rotatably supporting the upper drum and the rotary magnetic head with respect to the lower drum. The second tilt drive means includes a second rotation fulcrum that rotatably supports the lower drum with respect to the base of the apparatus, and the first rotation fulcrum is orthogonal to the central axis of the lower drum and The magnetic tape is arranged on the first straight line passing through the center of the winding range of the magnetic tape around the peripheral surface of the structure, and the second rotation fulcrum is arranged on the second straight line parallel to the first straight line. The magnetic recording / reproducing apparatus according to claim 1, characterized in that

The invention according to claim 3 is that "the second straight line is
3. The magnetic recording / reproducing apparatus according to claim 2, wherein the magnetic recording / reproducing apparatus is a straight line located closer to the exit side of the magnetic tape traveling path than the center position of the winding range of the magnetic tape with respect to the peripheral surface of the drum structure. Is provided,

According to a fourth aspect of the present invention, "recording / reproducing operation is performed by using a rotary magnetic head on a magnetic tape wound around a part of a peripheral surface of a drum structure including an upper drum and a lower drum. In the magnetic recording / reproducing apparatus, an upper drum having a sliding contact surface of a magnetic tape, a rotary magnetic head,
The upper surface of the upper drum includes a sliding contact surface of the magnetic tape located on an extended surface of the sliding contact surface of the magnetic tape and a lower portion of the sliding contact surface having a smaller diameter portion that is smaller in diameter than the sliding contact surface, and is provided coaxially with the upper drum. The lower drum and the upper and lower drums are separated from each other, and the position of the reference edge of the magnetic tape, which is arranged close to the outer peripheral surface of the small diameter portion formed in the lower portion of the lower drum, is set. A guide for regulating the position of the magnetic tape to be regulated,
First tilt drive means for integrally inclining the upper and lower drums and the rotary magnetic head so that the recording trace formed on the magnetic tape and the rotation locus surface of the rotary magnetic head coincide with each other. A magnetic recording / reproducing apparatus comprising: a second tilt drive means for tilting the tape position regulating guide portion so as to match the reference edge position of the magnetic tape. Is provided,

According to a fifth aspect of the present invention, "the first tilt drive means includes a first rotation fulcrum for rotatably supporting the lower drum with respect to the position regulating guide portion of the magnetic tape, Second
The tilt drive means has a second rotation fulcrum for rotatably supporting the position regulating guide portion of the magnetic tape with respect to the base of the apparatus, and the first rotation fulcrum is the central axis of the lower drum. Is arranged on a first straight line that is orthogonal to the first straight line and passes through a substantially central position of the winding range of the magnetic tape with respect to the peripheral surface of the drum structure, and the second rotation fulcrum is a second fulcrum parallel to the first straight line. The magnetic recording / reproducing apparatus according to claim 4, wherein the magnetic recording / reproducing apparatus is arranged on a straight line. Is provided,

The invention according to claim 6 provides "the magnetic recording / reproducing apparatus according to claim 5, wherein the first straight line and the second straight line are the same straight line." ,

The invention according to claim 7 is that "the second straight line is
6. The magnetic recording / reproducing apparatus according to claim 5, wherein the magnetic recording / reproducing apparatus is a straight line located closer to the exit side of the magnetic tape traveling path than the center position of the winding range of the magnetic tape with respect to the peripheral surface of the drum structure. Is provided,

According to an eighth aspect of the present invention, "the tilting modes of the constituent parts which are respectively tilted by the first tilting drive means and the second tilting drive means are changed according to the running speed of the magnetic tape. The magnetic recording / reproducing apparatus according to any one of claims 1 to 7.

According to a ninth aspect of the present invention, there is provided a magnetic source according to any one of the first to eighth aspects, wherein the drive source in the first tilt drive means and the drive source in the second drive means are provided separately. Recording and reproducing device. "

According to a tenth aspect of the present invention, "the same drive source is used as the drive source in the first tilt drive means and the drive source in the second tilt drive means. Any magnetic recording / reproducing device. "

[0025]

[0026]

[0027]

[0028]

According to an eleventh aspect of the present invention, "the first tilt drive means includes a first screw which is in contact with the lower drum and tilts the lower drum with respect to the position regulating guide portion of the magnetic tape, The second tilt drive means comprises a second screw that abuts on the position regulation guide portion of the magnetic tape and tilts the position regulation guide portion of the magnetic tape with respect to the base portion of the apparatus. The magnetic recording / reproducing apparatus according to any one of claims 4 to 8.

[0030]

The magnetic tape in the magnetic recording / reproducing apparatus in which the recording / reproducing operation is performed by using the rotary magnetic head on the magnetic tape wound around a part of the peripheral surface of the drum composed of the upper drum and the lower drum. The center axis between the upper drum having the contact surface and the rotary magnetic head is aligned by the first tilting means so that the recording trace formed on the magnetic tape and the rotary locus surface of the rotary magnetic head coincide with each other. Further, the magnetic tape is tilted with respect to the central axis of the lower drum provided with the magnetic tape position regulating guide portion for regulating the position of the reference edge of the magnetic tape and the sliding contact surface of the magnetic tape. Further, the lower drum is tilted by the second tilt driving means so that the guide portion for controlling the position of the magnetic tape on the lower drum is in a state of being aligned with the position of the reference edge of the magnetic tape. As a result, even when the recording trace formed on the magnetic tape has a small recording trace width, high-speed reproduction and rewinding reproduction can be performed without noise bars.

In a magnetic recording / reproducing apparatus in which a rotating magnetic head is used to perform recording / reproducing operation on a magnetic tape wound around a part of the peripheral surface of a drum structure consisting of an upper drum and a lower drum. The upper drum having the sliding contact surface, the rotary magnetic head, the sliding contact surface of the magnetic tape located on the extension surface of the sliding contact surface of the magnetic tape on the upper drum, and the lower part of the sliding contact surface having a smaller diameter than the sliding contact surface. The lower drum, which is provided with a small-diameter portion and is coaxial with the upper drum, is configured separately from the upper and lower drums, and is provided on the outer peripheral surface of the small-diameter portion formed at the lower portion of the lower drum. A magnetic tape position regulating guide portion that regulates the position of the reference edge of the magnetic tape, which are arranged close to each other, is provided, and the upper and lower drums and the rotary magnetic head are integrated by the first tilt drive means. Tilted with first By tilting the position regulating guide portion of the magnetic tape so as to coincide with the reference edge position of the magnetic tape by the inclination driving means, the recording trace formed on the magnetic tape and the rotation locus surface of the rotary magnetic head coincide with each other. Can be made. As a result, even when the recording trace formed on the magnetic tape has a small recording trace width, high-speed reproduction and rewinding reproduction can be performed without noise bars.

[0032]

[0033]

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The specific contents of the magnetic recording / reproducing apparatus of the present invention will be described in detail below with reference to the accompanying drawings. 1, FIG. 2, FIG. 10 and FIG. 11 are overall side cross-sectional views of the essential parts of the magnetic recording / reproducing apparatus of the present invention, and FIGS. 3 and 4 show a part of the constituent parts of the magnetic recording / reproducing apparatus of the present invention. FIG. 5 is a side sectional view for explaining the operation of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 1 and 2, and FIG. 6 and FIG. 8 are overall main parts of the magnetic recording / reproducing apparatus of the present invention. FIG. 7 is a perspective view, and FIG. 7 and FIG. 9 are side sectional views of a part of the components of the magnetic recording / reproducing apparatus of the present invention.
2 is a side sectional view for explaining the operation of the magnetic recording / reproducing apparatus of the present invention shown in FIG. 10, FIG. 13 is a side view of the vicinity of the drum for explaining the tape running system of the VTR, and FIG. 14 is the front of the drum of the VTR. FIGS. 15 and 17 are overall side sectional views of the essential part of the proposed magnetic recording / reproducing apparatus used as a part of the components of the magnetic recording / reproducing apparatus of the present invention, and FIGS. 15 and 17 are side sectional views for explaining the operation of the proposed magnetic recording / reproducing apparatus used as a part of the components of the magnetic recording / reproducing apparatus of the present invention, FIG. 19 and FIG.
1 is a side view for explaining the magnetic tape position when the drum is tilted, FIGS. 20 and 22 are explanatory views of a reproduction signal waveform when the drum is tilted, FIG. 23 is a top view of the drum, and FIGS.
FIG. 6 is a diagram showing a tape pattern.

FIG. 13 is a view exemplifying a tape traveling system of a VTR, in which 1 is a machine board, Dd is a magnetic tape position regulating guide portion G for regulating the position of a reference edge Te of the magnetic tape T. Equipped lower drum, Du upper drum, 2 and 3 inclined poles, SGR guide roller on the supply side, TGR
Is a guide roller on the tick-up side, and the magnetic tape T
Is the guide roller SGR, the inclined pole 2 on the supply side, and the guide portion G for magnetic tape position regulation that regulates the position of the reference edge of the magnetic tape formed on the lower drum Dd.
And the traveling path is regulated by the guide roller TGR on the tick-up side, the upper drum Du and the lower drum D.
The magnetic tape T travels at a predetermined moving speed while slidingly contacting a part of the peripheral surface of the magnetic tape T and the upper drum Du and the lower drum D.
An inclined recording mark is formed by the rotating magnetic head rotating in the gap with d.

FIG. 14 is a front view of the above-mentioned upper drum Du and lower drum Dd. In the figure, Ha and Hb are rotary magnetic heads, and OO is the central axis of the upper drum Du and lower drum Dd. Is shown. FIG. 23 is a top view of the vicinity of the drum, in which the magnetic tape T has an upper drum Du and a lower drum D.
It is shown that the outer peripheral surface of the drum (drum structure DA) consisting of d and the drum is wound in a range corresponding to an angle slightly larger than 180 degrees at the central angle of the drum. In the drawings, the 0 ° -180 ° direction display and the 90 ° -270 ° direction display are referred to as the 0 ° -180 ° direction and the 90 ° -270 ° direction. It corresponds to the direction indicated by such expression. In FIG. 23, O indicates the position of the central axis of the drum, and the position of 90 degrees in the figure is the center position of the winding range of the magnetic tape with respect to the peripheral surface of the drum, which is 90 degrees shown in FIG. And 270
The straight line connecting the degree and the degree is the central position of the winding range of the magnetic tape with respect to the peripheral surface of the drum and the position O of the central axis of the drum.
The straight line connecting 0 ° and 180 ° shown in FIG. 23 is a straight line that connects the 90 ° and 270 °, and is a straight line that is orthogonal to the straight line that connects 90 ° and 270 °. It is a straight line passing through the position O. Note that illustration of the inclined pole is omitted in FIG.

First, the magnetic recording / reproducing apparatus of the present invention illustrated in FIGS. 1 and 2 is a magnetic tape wound around a part of the peripheral surface of a drum composed of an upper drum Du and a lower drum Dd. In addition, the upper drum Du having the sliding contact surface 4 of the magnetic tape in the magnetic recording / reproducing apparatus in which the recording / reproducing operation is performed by using the rotating magnetic heads Ha, Hb and the rotating magnetic head Ha,
For the position regulation of the magnetic tape, which regulates the position of the reference edge of the magnetic tape so that the recording trace formed on the magnetic tape and the rotation locus surface of the rotary magnetic head coincide with the central axis of Hb. First inclining means for inclining with respect to the central axis of the lower drum Dd provided with the guide portion G and the sliding contact surface 5 of the magnetic tape, and for controlling the position of the magnetic tape on the lower drum Dd described above. An embodiment of a magnetic recording / reproducing apparatus configured so as to include a second tilt drive means for tilting the lower drum so that the guide portion G is in a state of being aligned with the position of the reference edge of the magnetic tape is shown. There is.

In FIGS. 10 and 11, the magnetic tape wound around a part of the peripheral surface of the drum composed of the upper drum Du and the lower drum Dd is recorded / reproduced by using the rotary magnetic heads Ha and Hb. The upper drum Du and the rotary magnetic heads Ha and Hb, which are provided with the sliding contact surface 4 of the magnetic tape in the magnetic recording / reproducing apparatus in which the operation is performed, are located on the extended surface of the sliding contact surface 4 of the magnetic tape in the upper drum Du. The magnetic tape is provided with a lower drum Dd provided with a sliding contact surface 5 of the magnetic tape and provided coaxially with the upper drum Du, the above-mentioned upper and lower drums Du and Dd, and rotary magnetic heads Ha and Hb. First tilt drive means for integrally tilting so that the recording trace formed on the disk and the rotation locus surface of the rotary magnetic head coincide with each other, and the above-mentioned upper and lower drums Du and Dd.
And the lower drum D described above, which is configured separately from
The guide portion GA for position regulation of the magnetic tape for regulating the position of the reference edge of the magnetic tape, which is arranged close to the outer peripheral surface of the small diameter portion 82 formed in the lower part of d, is used as the reference edge position of the magnetic tape. 2 shows an embodiment of a magnetic recording / reproducing apparatus configured so as to include a second tilt drive means for tilting so as to match with.

Further, FIG. 15 shows that the lower drum in the magnetic recording / reproducing apparatus shown in FIGS. 1 and 2 has been fixed and only the tilting means corresponding to the above-mentioned first tilting means. FIG. 1 is a diagram showing a component part of a magnetic recording / reproducing apparatus having a configuration form including FIG.
The magnetic recording / reproducing apparatus having the configuration shown in FIG. Magnetic tape displacement driving means (a specific configuration example is illustrated in FIGS. 6 to 9) for performing an operation of changing the heights of a plurality of guide poles provided in the width direction of the magnetic tape. It is used to configure the magnetic recording / reproducing apparatus of the present invention.

Furthermore, FIG. 17 shows the above-described FIG. 10 and FIG.
In the magnetic recording / reproducing apparatus shown in FIG. 1, the magnetic tape position regulating guide portion GA is fixed, and only the tilting means corresponding to the first tilting means is provided. FIG. 18 is a diagram showing a component part of the reproducing device, and the component part of the magnetic recording / reproducing device of the configuration shown in FIG. 17 includes a position regulation guide portion GA of the magnetic tape and a reference edge position of the magnetic tape. The magnetic tape displacement driving means (specifically, the operation for changing the heights of the plurality of guide poles provided in the traveling path of the magnetic tape in the width direction of the magnetic tape so that 6 to 9) are used to configure the magnetic recording / reproducing apparatus of the present invention.

First, a first embodiment of the magnetic recording / reproducing apparatus of the present invention will be described with reference to FIGS. 1 and 2, DB is a drum base, BP is a base plate, DA is a drum structure DA including an upper drum Du and a lower drum Dd, and Ha and Hb are rotary magnetic heads.
As the drum structure DA to be used in the implementation of the magnetic recording / reproducing apparatus of the present invention, the upper drum Du of the drum structure DA may be configured as a rotating upper drum (rotating drum) or may not be rotated. Although it can be used either in the configured form or in either of the configuration modes,
Drum structure DA in each of the embodiments described below
Then, an example is shown in which the upper drum Du thereof is configured as a rotary drum. Even if the upper drum does not rotate, the rotating magnetic head H
It goes without saying that a member for rotating a and Hb is provided.

In the illustrated configuration example, the rotary magnetic head H
The head holder 15 to which a is attached and the head holder 14 to which the rotary magnetic head Hb is attached are
It is fixed to the upper drum Du by 17. As the rotary magnetic heads Ha and Hb to be provided at positions 180 degrees symmetrical to each other in the outer peripheral direction of the upper drum Du, for example, each has a configuration in which an SP head and an EP head are arranged adjacent to each other. A rotating magnetic head,
Alternatively, each of them is, for example, a plurality (for example, 3
Multiple rotary magnetic heads (for example, 3)
It is possible to use a rotary magnetic head having a configuration in which recording traces of (book) can be recorded in parallel, or a rotary magnetic head having any other configuration.

The upper drum Du is a drum motor M.
The upper drum fixing member 7 fixed to the rotating shaft 6 of d is fixed with screws 8 and 9. Then, when the drum motor Md rotates at a predetermined rotation speed, the rotary magnetic heads Ha and Hb fixed to the upper drum Du are rotatably supported by the bearings 10 and 11 attached to the support member SA. It rotates integrally with the rotary shaft 6. 12
Is a rotary transformer fixed to the upper drum fixing member 7,
Reference numeral 13 is a rotary transformer attached to the above-mentioned support member SA. The support member SA includes a drum motor M.
The stator part 20 of d is fixed by screws 18 and 19, and the rotor part 21 of the drum motor Md is screwed to the support 22 fixed to the rotary shaft 6 by screw 25. It is attached by 23 and 24. The drum motor Md shown in the figure is provided with an armature winding 20a on the stator portion 20 thereof,
Further, it is shown that the rotor portion 21 thereof is provided with a permanent magnet 21b.

The above-mentioned support member SA is provided in such a manner that the upper portion thereof is located in the inner space of the lower drum Dd, but the upper end 26 of the support member SA and the inner side of the fixed drum Dd. Drum structure DA between the flange 27
Rotational fulcrums 28 and 29 are provided in the 90 ° -270 ° direction as shown in FIG. In addition, the support member SA has a protruding portion 26a at the upper end 26 thereof.
Between the upper surface side of the base plate BP and the lower surface side of the support member SA fixed to the lower end portion of the lower drum Dd by screws 32 (FIG. 2). Springs 30 and 31 are mounted, and between the lower surface side of the base plate BP and the cover 33 of the drum motor Md integrally connected and fixed to the support member SA, springs 34 and 35 are provided.
Is installed. FIG. 4 shows the base plate B described above.
FIG. 3 shows a perspective view of P as seen from the back side, and FIG. 3 shows a perspective view of the base plate BP as seen from the front side.

As shown in FIG. 2, the leaf spring 4 is attached to the base plate BP by screws 40 and 41.
2 (the whole shape of the leaf spring 42 is shown in FIG. 3) is fixed, and the tip end of the leaf spring 42 is pressure-bonded to the lower surface of the drum base DB. The base plate BP is in a state of being slightly displaceable in the vertical direction with respect to the drum base DB. The positioning of the base plate BP with respect to the drum base DB is performed by using the positioning pins 43 and 44 provided on the drum base DB in the 0 ° and 180 ° directions of the drum structure.
This is performed by fitting the holes in the base plate BP {see FIG. 1 (b)}.

Between the upper surface side of the base plate BP and the lower surface side of the support member SA, an annular cam member CA (annular cam member) for adjusting the inclination of the rotary shaft 6 which functions as an inclination adjusting means for the rotary shaft 6 is provided. CA) is provided, and between the lower surface side of the base plate BP and the upper surface side of the drum base DB, an annular cam member CRA for tilt adjustment that functions as tilt adjusting means for the center axis of the lower drum Dd. The (annular cam member CRA) is provided. The positioning of the above-mentioned annular cam member CRA with respect to the drum base DB is performed by the positioning pins 45 and 46 provided on the drum base DB in the 90 ° and 270 ° directions of the drum structure (FIG. 1).
(A) and FIG. 3} is performed by contacting the inner peripheral edge of the annular cam member CRA. FIG. 3 shows a specific configuration example of the annular cam member CA for adjusting the inclination of the rotating shaft and the annular cam member CRA for adjusting the inclination of the central axis of the lower drum Dd. It is shown.

Cam followers 36 and 37 projecting from the support member SA are in contact with the cam contours 58 to 63 (see FIG. 3) formed on the upper surface of the above-mentioned annular cam member CA. When the annular cam member CA is rotated by a driving force from a driving source (not shown), the upper drum Du and the supporting member SA connected via the rotary shaft 6 are connected. The drum motor Md and the drum motor Md have a rotation center around the rotation fulcrums 28 and 29.
The central axis of the upper drum Du and the support member SA (the central axis of the rotary shaft 6) is at a predetermined angle from the central axis of the lower drum Dd in the direction of 0 ° to 180 ° of the drum structure DA {FIG. 1 (b )
It will be tilted in the left-right direction on the plane of
A specific configuration example of the annular cam member CA, an operation mode, and the like will be described later in detail with reference to FIG. 3 and other drawings.

Further, the annular cam member CRA for tilt adjustment which functions as tilt adjusting means for the central axis of the lower drum Dd provided between the lower surface side of the base plate BP and the upper surface side of the drum base DB is provided. , Annular cam member CR
The cam followers 47 and 48 protruding from the base plate BP are in contact with the cam contours 51 to 56 (see FIG. 3) formed on the upper surface of A, and the annular cam member CRA is When the lower drum Dd fixed to the above-mentioned base plate BP is rotated by a driving force from a driving source (not shown), the central axis of the lower drum Dd is at a predetermined angle from the upper drum Du. The drum structure DA is inclined in the direction of 0 ° -180 ° (the left-right direction of the paper surface in FIG. 1B) with respect to the central axis, but a specific configuration example of the annular cam member CRA described above. The operation mode and the like will be described later in detail with reference to FIG. 3 and other drawings.

FIG. 3 shows a drum base DB, and a cam follower 4 having a bottom surface rotatably mounted on the upper surface of the drum base DB and projecting from the back surface of the base plate BP.
7, 48 {see FIGS. 1 (a), (b) and FIG. 4} and the cam contours 51-56, and the fulcrum that abuts the fulcrum projections 49, 50 that are provided on the back side of the base plate BP. An annular cam member CRA having flat surfaces 38 and 39 on the upper surface, a base plate BP, and an annular cam member CA rotatably fitted in a guide groove 57 provided on the upper surface side of the base plate BP. It is a perspective view for showing the concrete composition mode of each part of. The annular cam member CA for tilt adjustment of the rotary shaft, which is rotatably fitted in the guide groove 57 on the upper surface side of the base plate BP and functions as the tilt adjusting means of the rotary shaft 6, projects from the support member SA. The cam contour 58 to which the installed cam followers 36, 37 abut
63 are configured. Reference numeral 64 denotes a connecting portion, and an arcuate gear 65 is provided at the tip end portion.

Power is supplied to the arcuate gear 65 from a drive source (not shown) through a pinion (not shown), and the annular cam member CA is guided in the guide groove 57 on the upper surface side of the base plate BP. When rotated by, the cam followers 36 and 37 projecting from the support member SA come into contact with sequentially different cam contours 58 to 63 formed on the annular cam member CA. The rotary shaft 6 rotatably supported by the bearings 10 and 11 mounted on the support member SA is rotated by a predetermined angle to the lower drum Dd.
It is possible to incline the drum structure DA in the direction of 0 ° -180 ° with respect to the central axis (left-right direction of the paper surface in FIG. 1B), whereby the upper drum Du, the support member SA, and the drum motor. The Md and the Md are integrally tilted by a predetermined angle in the direction of 0 ° -180 ° of the drum structure DA with respect to the central axis of the lower drum Dd (the left-right direction of the paper surface in FIG. 1B). be able to.

In the guide groove 57 on the upper surface side of the base plate BP described above, the notch 57a and the through holes 57b and 57c (see FIG. 3).
And FIG. 4) are provided, and the notch 57a is provided.
Pins 66 to 68 for connecting the above-mentioned two annular cam members CRA and CA are allowed to pass through the through holes 57b and 57c. The pin 66 described above has an annular cam member CA at one end thereof.
The pin 67 is press-fitted into a hole 69 formed therein, and one end of the pin 67 is press-fitted into a hole 70 formed in the annular cam member CA.
It is pressed into a hole 71 formed in A. The pins 66 to 68 are provided with notches 57a and through holes 57b provided in the guide groove 57 on the upper surface side of the base plate BP.
57c, the other end of each of the pins 66 to 68 is press-fitted into the corresponding one of the through holes 72 to 74 provided in the annular cam member CRA. The holes 75, 76 provided in the base plate BP shown in FIG. 3 and the holes 77, 78 provided in the base plate BP shown in FIG.
Is a hole into which the above-mentioned springs 30, 31, 34 and 35 shown in FIGS. 1 (a) and 1 (b) are mounted.

The arc-shaped members designated by 79 to 81 in FIG. 4 are outer peripheral wall surfaces 79a, 80a, 81a.
The position of the inner peripheral wall surface 82 of the annular cam member CRA is regulated by. As described above, the annular cam member CA provided on the upper surface side of the base plate BP and used for adjusting the inclination of the rotary shaft 6, and the base plate B.
The annular cam member CRA, which is provided on the lower surface side of P and is used for adjusting the inclination of the central axis of the lower drum Dd, is connected by the pins 66 to 68, whereby the inclination of the rotating shaft 6 is increased. Inclination of the rotary shaft 6 is performed by supplying power from an unillustrated drive source to an arcuate gear 65 provided on the annular cam member CA used for adjustment through a pinion, not illustrated. When the annular cam member CA used for adjustment is rotated in the guide groove 57 on the upper surface side of the base plate BP, the annular cam member C described above is rotated.
An annular cam member CRA used for adjusting the inclination of the central axis of the lower drum Dd is formed on the upper surface of the drum base DB on the rear surface side of the base plate BP at the same time as the rotation of A. Since the members 79 to 81 rotate while being guided by the outer peripheral surfaces of the members 79 to 81, an annular cam member CA used for adjusting the inclination of the rotary shaft 6 by the power from one driving source.
And the annular cam member CRA used for adjusting the inclination of the central axis of the lower drum Dd can be driven in conjunction with each other, so that the structure of the drive mechanism can be simplified. The annular cam member CA used for adjusting the inclination of the rotary shaft 6 and the annular cam member CRA used for adjusting the inclination of the central axis of the lower drum Dd are separated by separate drive sources. Of course, it may be configured to be driven to.

In the magnetic recording / reproducing apparatus of the present invention illustrated in FIGS. 1 and 2, the annular cam member CA for adjusting the inclination of the rotary shaft 6 which functions as the inclination adjusting means of the rotary shaft 6,
When the arcuate gear 65 is driven by the rotation of a pinion (not shown) and rotates in the guide groove 57 on the upper surface side of the base plate BP, it comes into contact with the cam followers 36, 37 protruding from the support member SA. The cam contours 58 to 63 of the tilt-adjusting annular cam member CA that is brought into a state are sequentially changed. Further, since the tilt-adjusting annular cam member CRA that functions as the tilt adjusting means of the central axis of the lower drum Dd is connected to the above-mentioned annular cam member CA by the pins 66 to 68, the above-mentioned annular cam is used. When the ring-shaped cam member CRA performs the rotational movement in synchronization with the rotational movement of the member CA, the cam followers 47, 4 protruding from the base plate BP.
8, the cam contours 51 to 56 of the annular cam member CRA brought into contact with 8 are sequentially changed. The annular cam member C
The portions 38 and 39 in RA are annular cam members CR
A is a fulcrum plane portion that is at the same height when A is placed on the drum base DB, and the fulcrum plane portions 38 and 39 of the annular cam member CRA described above are provided with fulcrums protruding from the base plate BP. The projections 49 and 50 contact each other.

When the magnetic recording / reproducing apparatus shown in FIGS. 1 and 2 is operating in the normal reproducing mode, the cam follower 36 projecting from the supporting member SA has an annular shape for tilt adjustment. The cam follower 37 that is in contact with the cam contour 62 of the cam member CA of FIG.
It contacts the cam profile 59 of the annular cam member CA for adjusting the inclination. On the other hand, the cam follower 47 protruding from the base plate BP abuts on the cam contour 55 of the annular cam member CRA, and the cam follower 48 protruding from the base plate BP is the annular cam member CRA. Cam profile 52
Abut. The annular cam member CA for adjusting the inclination described above.
Cam contours 59, 62 of the same height, and the cam contours 55, 55 of the annular cam member CRA.
52 is the same height as the fulcrum plane portions 38, 39 of the annular cam member CRA, and therefore, when the magnetic recording / reproducing apparatus is operating in the normal reproducing mode, the upper drum Du. The central axes of the lower drum Dd and the lower drum Dd are aligned with each other, and in this operating state, the magnetic tape T has a reference edge Te formed on the outer peripheral portion of the lower drum Dd. G
Is correctly abutted over the entire area of the magnetic tape, and the running position of the magnetic tape T is the guide portion G for controlling the position of the magnetic tape.
With this, it is possible to travel at a predetermined traveling speed while being stably held in a regular position, and for example, as shown in FIG. 20A, a reproduction signal showing an envelope in a good state can be obtained.

The upper drum Du and the lower drum D when the magnetic recording / reproducing apparatus is operating in the normal reproducing mode.
19 (a) and 21 (a) show the state of d and the magnetic tape T in a state of being wound around a part of the outer peripheral surfaces of the above-mentioned upper drum Du and lower drum Dd. . FIG.
9 and FIG. 21, the solid straight line indicated by O-O indicates the upper drum Du and the lower drum Dd when the magnetic recording / reproducing apparatus operates in the normal reproducing mode as described above. It shows the position of the central axis of.

Next, when the magnetic recording / reproducing apparatus shown in FIGS. 1 and 2 is operating in the fast-forward reproducing mode (FF), the cam follower 3 protruding from the supporting member SA is provided.
6 is in contact with the cam contour 61 of the tilt-adjusting annular cam member CA, and the cam follower 37 protruding from the support member SA is the cam contour 58 of the tilt-adjusting annular cam member CA. Abut. Since the cam contour 61 of the annular cam member CA for tilt adjustment described above is configured to be higher than the cam contour 58, the central axes of the upper drum Du and the support member SA are magnetically recorded and reproduced. When the device is operating in the fast-forward playback mode, FIG.
Like the straight line shown by the broken line in (d), the positions of the central axes of the upper drum Du and the lower drum Dd when the magnetic recording / reproducing apparatus is operating in the normal reproduction mode are shown. Since the magnetic recording / reproducing apparatus shown in FIG. 1 is in a state in which the magnetic recording / reproducing apparatus shown in FIG.
The state is as illustrated in FIG.

As described above, the magnetic recording / reproducing apparatus shown in FIGS. 1 and 2 has an annular cam member CA for adjusting the inclination of the rotary shaft 6, which functions as an inclination adjusting means for the rotary shaft 6.
Two annular cam members CA and CRA with an annular cam member CRA for tilt adjustment functioning as an inclination adjusting means of the central axis of the lower drum Dd are connected by pins 66 to 68, and the two annular rings described above are provided. Although the cam members CA and CRA of FIG. 2 are configured to rotate in synchronization with each other, the magnetic recording / reproducing apparatus shown in FIGS. 1 and 2 is assumed to have the above-described lower drum Dd. When it is assumed that the annular cam member CRA for tilt adjustment functioning as the tilt adjustment means of the central axis of No. 1 is not provided (corresponding to the configuration mode shown in FIG. 15 described later). When the magnetic recording / reproducing apparatus operates in the fast-forward reproducing mode, the magnetic recording / reproducing apparatus operates normally by the operation of the annular cam member CA for adjusting the inclination of the rotating shaft which functions as the inclination adjusting means of the rotating shaft 6. The positions of the central axes of the upper drum Du and the lower drum Dd in the case of operating in the reproduction mode are inclined with respect to the straight line illustrated by the solid line indicated by OO in FIG. 19 described above. Since the upper drum Du and the supporting member SA only incline so as to be in a state like the straight line shown by the broken line in FIGS. As shown in FIG. 19B, the reference edge Te of the magnetic tape T along with the inclination of the upper drum Du is one of the guide portions G for position regulation of the magnetic tape formed on the outer peripheral portion of the lower drum Dd. As a result, the traveling position of the magnetic tape T is not correctly regulated by the position regulating guide portion G of the magnetic tape, and the traveling position of the magnetic tape T fluctuates in the width direction of the magnetic tape. To get into the state Is not properly track the recording track of the magnetic tape T by the rotational locus of the magnetic head, it is caused not only obtained reproduction signal indicating the envelope with a large variation as illustrated for example in FIG. 20 (b).

However, in the magnetic recording / reproducing apparatus illustrated in FIGS. 1 and 2 of the present invention, the lower drum Dd is provided in addition to the annular cam member CA for adjusting the inclination of the rotating shaft which functions as the inclination adjusting means of the rotating shaft 6. An annular cam member CRA for tilt adjustment which functions as a tilt adjusting means for the central axis of the disk is also provided, and when the magnetic recording / reproducing apparatus performs the reproducing operation in the fast-forward reproducing mode as described above, the annular cam described above is provided. The reference edge Te of the magnetic tape T is formed on the outer peripheral portion of the lower drum Dd as the central axis of the upper drum Du and the supporting member SA is tilted by a predetermined angle by the operation of the member CA. 1 so as to displace the position of the position regulating guide portion G of the magnetic tape formed on the outer peripheral portion of the lower drum Dd by the distance from a part of the position regulating guide portion G of FIG.
As shown in FIG. 9 (c), the central axis of the lower drum Dd is supported by the upper drum Du and the central axis of the lower drum Dd by the operation of the annular cam member CRA for tilt adjustment which functions as the inclination adjusting means of the central axis of the lower drum Dd. The reference edge Te of the magnetic tape T is inclined toward the inclination direction of the central axis of the member SA, and the reference edge Te of the magnetic tape T is formed on the outer peripheral portion of the lower drum Dd. Of the magnetic tape T so that the magnetic tape T travels at a predetermined traveling speed while the traveling position of the magnetic tape T is stably held at a regular position by the position guide portion G of the magnetic tape. By doing so, for example, as shown in FIG. 20A, a reproduction signal showing an envelope in a good state can be obtained.

That is, the magnetic recording / reproducing apparatus shown in FIGS. 1 and 2 is operated in the fast-forward reproduction mode (FF), and the cam follower 36 projecting from the support member SA is provided.
Comes into contact with the cam contour 61 of the tilt-adjusting annular cam member CA, and the cam follower 37 projecting from the support member SA and the cam contour 58 of the tilt-adjusting annular cam member CA. When brought into contact with each other, the center axis of the lower drum Dd, which is connected by the pins 66 to 68, to the annular cam member CA for adjusting the inclination of the rotating shaft, which functions as the inclination adjusting means of the rotating shaft 6 described above. A cam follower 47 protruding from a base plate BP fixed to the lower drum Dd contacts the cam contour 54 of the tilt-adjusting annular cam member CRA that functions as the tilt adjusting means, and the above-mentioned annular shape. Cam profile 51 in the cam member CRA of
Is a base plate BP fixed to the lower drum Dd.
The cam follower 48, which is provided so as to project in the position, is brought into contact with the cam follower 48.

The above-mentioned annular cam member CR for adjusting the inclination
The cam contour 54 of A is configured to be higher than the cam contour 51, and the fulcrum plane portions 38, 3 which are configured at the same height in the annular cam member CRA.
Since the fulcrum projections 49 and 50 projecting from the base plate BP are in contact with the lower plate 9, the lower drum Dd to which the above-mentioned base plate BP is fixed is attached.
Is an annular cam member CRA for adjusting the inclination in a direction orthogonal to the straight line connecting the fulcrum projections 49, 50.
Will be inclined by an angle corresponding to the height difference between the two cam contours 54, 51 at. As a result, the central axis of the lower drum Dd described above is inclined by a predetermined small angle in the direction of the central axes of the upper drum Du and the support member SA, and the reference edge Te of the magnetic tape T is the outer periphery of the lower drum Dd. The guide portion G for position regulation of the magnetic tape formed in the portion is brought into a state of being properly abutted over the entire area, and the traveling position of the magnetic tape T is stably stabilized at the regular position by the guide portion G for position regulation of the magnetic tape. This allows the vehicle to travel at a predetermined traveling speed in the retained state.

Next, when the magnetic recording / reproducing apparatus shown in FIGS. 1 and 2 is operating in the rewinding reproducing mode (FB), the cam follower 3 projecting from the supporting member SA is provided.
6 abuts on the cam contour 63 of the annular cam member CA for tilt adjustment, and the cam follower 37 projecting from the support member SA and the cam contour 60 of the annular cam member CA for tilt adjustment. Abut. Since the cam contour 63 of the annular cam member CA for tilt adjustment described above is lower than the cam contour 60, the central axes of the upper drum Du and the support member SA are magnetically recorded and reproduced. When the device is operating in the rewinding reproduction mode, FIG.
Like the straight line shown by the broken line in (d), the positions of the central axes of the upper drum Du and the lower drum Dd when the magnetic recording / reproducing apparatus is operating in the normal reproduction mode are shown. Since the magnetic recording / reproducing apparatus shown in FIG. 1 is tilted to the left with respect to the straight line shown by the solid line shown by O--O in FIG.
The state is as illustrated in FIG.

In the magnetic recording / reproducing apparatus illustrated in FIGS. 1 and 2 of the present invention, in addition to the annular cam member CA for adjusting the tilt of the rotary shaft 6, which functions as the tilt adjusting means for the rotary shaft 6, the lower drum Dd is provided. An annular cam member CRA for tilt adjustment functioning as a tilt adjusting means for the central shaft is also provided, and when the magnetic recording / reproducing apparatus performs the reproducing operation in the rewinding reproducing mode as described above, the annular cam described above is provided. As the central axis of the upper drum Du and the supporting member SA is tilted by a predetermined angle by the operation of the member CA, the reference edge T of the magnetic tape T is
21e, the lower drum D
The position of the magnetic tape position regulating guide portion G formed on the outer peripheral portion of the lower drum Dd is displaced by the distance from a part of the magnetic tape position regulating guide portion G formed on the outer peripheral portion of d. Then, as shown in FIG. 21 (c),
By the operation of the tilt-adjusting annular cam member CRA functioning as the tilt adjusting means of the center axis of the lower drum Dd, the center axis of the lower drum Dd is directed in the tilt direction of the center axes of the upper drum Du and the support member SA, The reference edge Te of the magnetic tape T is tilted by a predetermined slight angle so that the reference edge Te of the magnetic tape is correctly abutted over the entire area of the position regulating guide portion G of the magnetic tape formed on the outer peripheral portion of the lower drum Dd. The tape T is allowed to travel at a predetermined traveling speed while being stably held at a regular position by the magnetic tape position regulation guide portion G, whereby, for example, FIG.
As shown in (b), a reproduced signal showing an envelope in a good state can be obtained.

The reproduced signal showing the envelope in the defective state with many fluctuations illustrated in FIG. 22A is obtained by the magnetic recording / reproducing apparatus shown in FIGS. 1 and 2 at the center of the lower drum Dd. In the case where the tilt-adjusting annular cam member CRA functioning as the shaft tilt adjusting means is not provided (corresponding to the configuration as shown in FIG. 15 described later), magnetic recording is performed. 6 shows an example of a reproduced signal waveform obtained when the reproducing apparatus is operated in the rewinding reproduction mode. That is, the magnetic recording / reproducing apparatus shown in FIG. 1 and FIG. 2 operates only by the annular cam member CA for adjusting the inclination of the rotating shaft, which functions as the inclination adjusting means of the rotating shaft 6 during the rewinding reproduction operation. With respect to the positions of the central axes of the upper drum Du and the lower drum Dd when the magnetic recording / reproducing apparatus is operating in the normal reproduction mode (the straight line shown by the solid line indicated by OO in FIG. 21), The central axes of the upper drum Du and the support member SA are shown in FIG.
In the case where only the inclined line is tilted to a state like the straight line shown by the broken line shown in (b) to (d), the reference edge Te of the magnetic tape T is changed as the upper drum Du is tilted.
As shown in FIG. 21B, the guide portion G for controlling the position of the magnetic tape formed on the outer peripheral portion of the lower drum Dd.
Occurs, the traveling position of the magnetic tape T is not correctly regulated by the position regulating guide portion G of the magnetic tape, and the traveling position of the magnetic tape T fluctuates in the width direction of the magnetic tape. 22A, the recording trace of the magnetic tape T cannot be correctly traced due to the rotation locus of the rotary magnetic head, as shown in FIG.
It is possible that only a reproduced signal having an envelope with a large fluctuation as shown in FIG.

When the magnetic recording / reproducing apparatus shown in FIGS. 1 and 2 is operated in the rewinding reproducing mode (FB), the cam follower 36 projecting from the supporting member SA is used for adjusting the inclination. The cam follower 37 that abuts on the cam contour 63 of the annular cam member CA and that is projected from the support member SA is
When brought into contact with the cam contour 60 of the annular cam member CA for tilt adjustment, the annular cam member CA and pin 66 for tilt adjustment of the rotary shaft functioning as the tilt adjusting means of the rotary shaft 6 described above. The cam contour 56 of the annular cam member CRA for tilt adjustment functioning as the tilt adjusting means for the central axis of the lower drum Dd, which is connected to the base plate BP fixed to the lower drum Dd.
The cam follower 47 projecting from the abutment surface contacts the cam contour 53 of the annular cam member CRA, and the cam follower 48 projecting from the base plate BP fixed to the lower drum Dd is in contact with the cam contour 53. It is put in contact.

The above-mentioned annular cam member CR for adjusting the inclination
The cam profile 56 of A is configured to be lower than the cam profile 53, and the fulcrum plane portions 38, 3 which are configured at the same height in the annular cam member CRA.
Since the fulcrum projections 49 and 50 projecting from the base plate BP are in contact with the lower plate 9, the lower drum Dd to which the above-mentioned base plate BP is fixed is attached.
Is an annular cam member CRA for adjusting the inclination in a direction orthogonal to the straight line connecting the fulcrum projections 49, 50.
Will be inclined by an angle corresponding to the difference in height between the two cam profiles 56, 53 at. As a result, the central axis of the lower drum Dd described above is inclined by a predetermined small angle in the direction of the central axes of the upper drum Du and the support member SA, and the reference edge Te of the magnetic tape T is the outer periphery of the lower drum Dd. The guide portion G for position regulation of the magnetic tape formed in the portion is brought into a state of being properly abutted over the entire area, and the traveling position of the magnetic tape T is stably stabilized at the regular position by the guide portion G for position regulation of the magnetic tape. This allows the vehicle to travel at a predetermined traveling speed in the retained state.

Next, a second embodiment of the magnetic recording / reproducing apparatus of the present invention will be described with reference to FIGS. In the magnetic recording / reproducing apparatus of this embodiment, the lower drum Dd in the drum structure DA including the upper drum Du and the lower drum Dd.
As the upper drum D provided with the sliding contact surface 4 of the magnetic tape
A magnetic tape sliding contact surface 5 located on an extended surface of the magnetic tape sliding contact surface 4 at u is provided, and a small diameter portion 82 is formed below the magnetic tape sliding contact surface 5.
As the drum structure DA described above, the upper drum Du
Can be used either as a rotating upper drum (rotating drum), as a non-rotating upper drum, or in either of the configuration modes. Each of the embodiments described below In the drum structure DA in (1), an example in which the upper drum Du thereof is configured as a rotating drum is shown. Needless to say, even if the upper drum does not rotate, a member for rotating the rotary magnetic heads Ha and Hb is provided. In the configuration example shown in FIGS. 10 and 11, the head holder 15 to which the rotary magnetic head Ha is attached and the head holder 14 to which the rotary magnetic head Hb is attached are attached to the upper drum Du by screws 16 and 17. It is fixed. The rotary magnetic heads Ha and Hb to be provided at positions 180 degrees symmetrical to each other in the outer peripheral direction of the upper drum Du are, for example, those in which SP heads and EP heads are arranged adjacent to each other. A rotary magnetic head, or a rotary configuration in which each of them is capable of simultaneously recording and forming a plurality of (for example, three) recording marks in parallel by a plurality (for example, three) of rotating magnetic heads. A magnetic head or a rotary magnetic head having any other configuration can be used.

The upper drum Du is a drum motor M.
The upper drum fixing member 7 fixed to the rotating shaft 6 of d is fixed with screws 8 and 9. Then, when the drum motor Md rotates at a predetermined rotation speed, the rotary magnetic heads Ha and Hb fixed to the upper drum Du are rotatably supported by the bearings 10 and 11 attached to the fixed drum Dd. It rotates integrally with the rotary shaft 6. 1
Reference numeral 2 is a rotary transformer fixed to the upper drum fixing member 7, and 13 is a rotary transformer attached to the lower drum Dd. A stator portion 20 of the drum motor Md is fixed to the lower drum Dd by screws 18 and 19, and a rotor portion 21 of the drum motor Md is fixed to the rotary shaft 6 by screws 25. It is attached by screws 23 and 24 to the supporting body 22. The drum motor Md shown in the drawing is
It is shown as being configured with armature windings 20a on its stator portion 20 and with permanent magnets 21b on its rotor portion 21.

GA is a magnetic tape position regulating guide portion for regulating the position of the reference edge of the magnetic tape. The magnetic tape position regulating guide portion GA is a separate body from the upper drum Du and the lower drum Dd. As a matter of fact, the central axis of the position regulating guide portion GA of the magnetic tape is formed integrally with the base plate BP in such an arrangement that the outer peripheral surface of the small diameter portion 82 of the lower drum Dd is brought close to the central portion. It is provided on the drum base DB through an annular cam member CRAg used for adjusting the inclination of the. 10A in the direction of 90 degrees to 270 degrees of the drum structure DA between the guide portion GA for controlling the position of the magnetic tape, the bottom portion 83 of the small diameter portion 82 of the lower drum Dd, and the above-mentioned base plate BP. As shown in FIG.
29 are provided. An annular cam member CA used for adjusting the inclination of the rotary shaft 6 is provided between the upper surface of the base plate BP and the bottom portion 83 of the small diameter portion 82 of the lower drum Dd.

Then, the upper drum Du and the lower drum Dd
And the drum motor Md, when the annular cam member CA used for adjusting the inclination of the rotary shaft 6 is rotated as described later, the base plate BP and the lower drum Dd.
In the direction perpendicular to the straight line connecting the rotation fulcrums 28 and 29 provided in the 90 ° -270 ° direction of the drum structure DA with the bottom portion 83 of the small diameter portion 82 in
Direction of 0 ° -180 ° of the drum structure DA {Fig. 10 (b)
Can be integrally tilted in the left and right directions in.

Holes 84 and 85 shown in FIG. 10A and holes 77 and 78 shown in FIG. 10B are provided on the lower surface side of the base plate BP. Between the holes 84, 85, 77, 78 described above and the cover 33 of the drum motor Md integrally connected to the lower drum Dd, individual springs 86,
87, 34 and 35 are attached. Further, as shown in FIG. 11, the base end portion of the leaf spring 42 (the overall shape of the leaf spring 42 is shown in FIG. 3) is fixed to the base plate BP by screws 40 and 41 as shown in FIG. The base plate BP is integrally formed with the position regulating guide portion GA of the magnetic tape as described above by pressing the tip end portion of the leaf spring 42 against the lower surface of the drum base DB. Is in a state in which it can be slightly displaced in the vertical direction with respect to the drum base DB.

The positioning of the base plate BP with respect to the drum base DB is carried out at 0 ° and 1 in the drum structure.
This is performed by fitting the positioning pins 43 and 44 provided on the drum base DB in the 80 degree direction into the holes provided in the base plate BP {see FIG. 10 (b)}.
It is shown in FIGS. 10 and 11 that the detailed structure of the base plate BP used in the magnetic recording / reproducing apparatus shown in FIGS. 10 and 11 is not specifically illustrated by using another drawing. The base plate BP used in the present magnetic recording / reproducing apparatus is integrally formed with the magnetic tape position regulating guide portion GA, and the above-mentioned four holes 84 on the back surface side of the base plate BP. , 8
5, 77 and 78 are provided (see FIGS. 1 and 2 described above).
In the base plate BP used in the magnetic recording / reproducing apparatus shown in FIG. 2, two holes 75, 76 out of the four holes for spring mounting are provided on the lower surface side of the base plate. 78 is provided) and FIGS.
The structure and operation of the magnetic recording / reproducing apparatus shown in FIGS. 10 and 11 are different from those of the base plate BP shown in FIG. Because it is considered possible.

As described above, between the upper surface side of the base plate BP integrally formed with the above-described magnetic tape position regulating guide portion GA and the bottom portion 83 of the small diameter portion 82 of the lower drum Dd. An annular cam member CA (annular cam member CA) for adjusting the inclination of the rotary shaft, which functions as an inclination adjusting means for the rotary shaft 6, is provided. Between the lower surface side of the integrally formed base plate BP and the upper surface side of the drum base DB, the inclination adjustment of the central axis of the guide portion GA for position regulation of the magnetic tape integrally formed with the base plate BP is adjusted. Annular cam member C for tilt adjustment which functions as a means
Although the RAg (annular cam member CRAg) is provided, the drum base D of the annular cam member CRAg described above is provided.
Positioning with respect to B is 90 degrees and 2 in the drum structure.
Positioning pins 45 and 46 (see FIG. 10A and FIG. 3) provided on the drum base DB in the 70 degree direction are brought into contact with the inner peripheral edge of the annular cam member CRAg.

Concrete examples of the above-mentioned annular cam member CA for adjusting the inclination of the rotating shaft and the annular cam member CRAg for adjusting the inclination functioning as the inclination adjusting means of the central axis of the guide portion GA for position regulation of the magnetic tape. The general configuration may be similar to that shown in FIG. Cam contour 5 formed on the upper surface of the annular cam member CA described above
8 to 63 (see FIG. 3) are in contact with cam followers 36 and 37 projecting from the lower drum Dd, and the annular cam member CA is from a drive source (not shown). When a drive force is applied to rotate the drive shaft, the above-mentioned upper drum Du, the lower drum Dd, and the drum motor Md, which are connected to each other via the rotary shaft 6, have the above-described rotary fulcrums 28, 29. With the center of rotation as the center of rotation, the center axis of the upper drum Du and the lower drum Dd (the center axis of the rotary shaft 6) is rotated by a predetermined angle with respect to the center axis of the magnetic tape position regulation guide portion GA. It is tilted in the direction of 0 ° -180 ° (the horizontal direction of the paper surface in FIG. 10B).

Also, for the tilt adjustment which functions as a tilt adjusting means for the central axis of the guide portion GA for position regulation of the magnetic tape provided between the lower surface side of the base plate BP and the upper surface side of the drum base DB. Annular cam member CRAg
On the cam contours 51 to 56 (see FIG. 3) formed on the upper surface of the annular cam member CRAg.
When the cam followers 47, 48 projecting from the abutment are in contact with each other and the annular cam member CRAg is rotated by being given a driving force from a driving source (not shown), The central axis of the guide portion GA for position regulation of the magnetic tape fixed to the base plate BP is a predetermined angle, and the central axis of the upper drum Du is 0 ° -1 of the drum structure DA.
Direction of 80 degrees (left and right direction of paper surface in FIG. 10B)
Will be inclined at.

Power is supplied to the arcuate gear 65 shown in FIG. 3 from a drive source (not shown) through a pinion (not shown), so that the annular cam member CA.
When the rotary motion is performed in the guide groove 57 on the upper surface side of the base plate BP, the above-described component portion including the upper drum Du, the lower drum Dd, and the drum motor Md rotates the rotary fulcrums 28 and 29. The center axis of the upper drum Du and the lower drum Dd (the center axis of the rotary shaft 6) is set as a center of movement, and the drum assembly DA is 0 degrees with respect to the center axis of the magnetic tape position regulating guide portion GA by a predetermined angle. -180 degree direction {Fig. 10 (b)
The specific operation mode of tilting in the left-right direction on the paper surface} and the annular cam member CRAg for tilt adjustment functioning as the tilt adjusting means of the central axis of the guide portion GA for position regulation of the magnetic tape are illustrated. When a driving force is applied from a non-driving source to perform rotational movement on the drum base DB, the central axis of the position regulating guide portion GA of the magnetic tape fixed to the base plate BP is set at a predetermined angle. However, the drum structure DA is 0 with respect to the center axis of the upper drum Du.
A specific operation mode of tilting in the direction of −180 degrees (the left-right direction of the paper surface in FIG. 10B) will be described with reference to FIGS. 1 and 2 and FIG. Since it can be inferred, detailed description thereof is omitted here.

An annular cam member CA provided on the upper surface side of the base plate BP and used for adjusting the inclination of the rotary shaft 6 and a lower surface side of the base plate BP for guiding the position regulation of the magnetic tape. Since the annular cam member CRAg used for adjusting the inclination of the central axis of the portion is connected by the pins 66 to 68, the annular cam member CA used for adjusting the inclination of the rotary shaft 6 is connected to the annular cam member CRAg. Power is supplied to the arcuate gear 65 provided from a drive source (not shown) via a pinion (not shown), and an annular cam member CA used for adjusting the inclination of the rotary shaft 6 is generated. When it is rotated in the guide groove 57 on the upper surface side of the base plate BP, it is used for adjusting the inclination of the central axis of the guide portion for regulating the position of the magnetic tape at the same time as the rotation of the annular cam member CA. The annular cam member CRAg being rotated is guided by the outer peripheral surfaces of the arc-shaped members 79 to 81 provided on the rear surface side of the base plate BP on the upper surface of the drum base DB, and therefore rotates one driving source. Both the annular cam member CA used for adjusting the inclination of the rotary shaft 6 by the power from the motor and the annular cam member CRAg used for adjusting the inclination of the central axis of the guide portion for controlling the position of the magnetic tape. Since they can be driven in conjunction with each other, the structure of the drive mechanism can be simplified.

An annular cam member CA used for adjusting the inclination of the rotary shaft 6 and an annular cam member CRAg used for adjusting the inclination of the central axis of the magnetic tape position regulating guide are provided. Of course, they may be configured to be separately driven by individual driving sources. Further, the number of cam contours in the annular cam member CA used for adjusting the inclination of the rotary shaft 6 and the annular cam member CRAg used for adjusting the inclination of the central axis of the guide portion for position regulation of the magnetic tape. It is needless to say that can be arbitrarily determined, and this point is the same for the magnetic recording / reproducing apparatus shown in FIGS. 1 and 2 and other figures.

Also in the magnetic recording / reproducing apparatus of the present invention illustrated in FIGS. 10 and 11, an annular cam member C for adjusting the inclination of the rotary shaft 6 which functions as a tilt adjusting means for the rotary shaft 6.
When A is driven by the rotation of a pinion (not shown) of the arc-shaped gear 65 and rotates in the guide groove 57 on the upper surface side of the base plate BP, the cam followers 36, 37 protruding from the lower drum Dd and The cam contours 58 to 63 of the annular cam member CA for tilt adjustment brought into contact with each other are sequentially changed, and the tilt adjustment functions as a tilt adjusting means of the central axis of the guide portion for magnetic tape position regulation. The ring-shaped cam member CRAg of the above-mentioned ring-shaped cam member CA and the pin 66-.
Since they are connected by 68, when the annular cam member CRAg performs the rotational movement in synchronization with the rotational movement of the annular cam member CA described above, the cam follower 47 projectingly provided on the base plate BP. , 48, the cam contours 51 to 56 of the annular cam member CRAg brought into contact with each other sequentially change. The portions 38 and 39 of the annular cam member CRAg are fulcrum plane portions that are at the same height when the annular cam member CRAg is placed on the drum base DB. The fulcrum plane portions 38 and 39 are brought into contact with fulcrum projections 49 and 50 which are provided on the base plate BP.

When the magnetic recording / reproducing apparatus shown in FIGS. 10 and 11 is operating in the normal reproducing mode, the cam follower 36 protruding from the lower drum Dd is
The cam follower 3 that is in contact with the cam contour 62 of the annular cam member CA for adjusting the inclination and that is provided to project from the lower drum Dd.
7 is a cam contour 59 of an annular cam member CA for tilt adjustment.
Abut. On the other hand, the cam follower 47 protruding from the base plate BP abuts the cam contour 55 of the annular cam member CRAg, and the cam follower 48 protruding from the base plate BP is the annular cam member CRAg. Abut the cam contour 52. The cam contours 59 and 62 of the annular cam member CA for tilt adjustment described above are configured to have the same height, and the cam contours 55 and 52 of the annular cam member CRAg are the same as the annular cam member CRAg. When the magnetic recording / reproducing apparatus is operating in the normal reproducing mode, the central axes of the upper drum Du and the lower drum Dd coincide with each other because the fulcrum plane portions 38 and 39 of the same are arranged at the same height. In this operating state, the reference edge Te of the magnetic tape T is in proper contact with the entire area of the position regulating guide portion GA of the magnetic tape, and the running position of the magnetic tape T is It is possible to travel at a predetermined traveling speed while being stably held in a regular position by the position regulating guide portion GA of the magnetic tape, as illustrated in FIG. 20A, for example. Reproduction signal is obtained indicating the envelope of good condition so that.

Next, when the magnetic recording / reproducing apparatus shown in FIGS. 10 and 11 is operating in the fast-forward reproduction mode (FF), the cam follower 36 projecting from the lower drum Dd Cam profile 6 of annular cam member CA for tilt adjustment
The cam follower 37 that abuts on the lower drum Dd abuts on the cam contour 58 of the tilt-adjusting annular cam member CA. The cam contour 61 of the annular cam member CA for tilt adjustment described above is configured to be higher than the cam contour 58, and therefore the upper drum Du.
When the magnetic recording / reproducing apparatus is operating in the fast-forward reproduction mode, the central axes of the lower drum Dd and the lower drum Dd are shown in FIG.
Like the straight line shown by the broken line in (d), the positions of the central axes of the upper drum Du and the lower drum Dd when the magnetic recording / reproducing apparatus is operating in the normal reproduction mode are shown. The magnetic recording / reproducing apparatus shown in FIG. 10 corresponds to the state in which the magnetic recording / reproducing apparatus shown in FIG. The state is as illustrated in (a).

As described above, the magnetic recording / reproducing apparatus shown in FIGS. 10 and 11 has an annular cam member CA for adjusting the tilt of the rotary shaft 6, which functions as tilt adjusting means for the rotary shaft 6.
And an annular cam member CRA for tilt adjustment that functions as tilt adjustment means for the central axis of the guide portion for controlling the position of the magnetic tape.
g and two annular cam members CA and CRAg
6 to 68 are connected to each other, and the two annular cam members CA and CRAg described above are configured to rotate in synchronization with each other. However, as shown in FIGS. If the magnetic recording / reproducing apparatus described above does not include the annular cam member CRAg for tilt adjustment that functions as the tilt adjusting means of the central axis of the guide portion for position regulation of the magnetic tape, the magnetic recording is not performed. When the reproducing device operates in the fast-forward reproducing mode, the magnetic recording / reproducing device operates in the normal reproducing mode by the operation of the annular cam member CA for adjusting the inclination of the rotating shaft which functions as the inclination adjusting means of the rotating shaft 6 described above. When the upper drum Du
The position of the central axis with respect to the lower drum Dd is shown in FIGS. 19B to 19D which are inclined with respect to the straight line shown by O-O in FIG. Since the upper drum Du and the lower drum Dd only incline so that the upper drum Du and the lower drum Dd are inclined so as to be in a state like a straight line shown by a broken line in the figure, the reference edge of the magnetic tape T is increased in accordance with the inclination of the upper drum Du. As shown in FIG. 19B, a state occurs in which Te is separated from a part of the magnetic tape position regulating guide portion GA, which causes the running position of the magnetic tape T to be restricted by the magnetic tape position. Since the guide position GA does not properly control the traveling position of the magnetic tape T in a state of varying in the width direction of the magnetic tape, the recording trace of the magnetic tape T is correctly traced by the rotation locus of the rotary magnetic head. I can't do it anymore It happens that only obtained reproduction signal indicating the envelope with a large variation as illustrated in FIG. 20 (b).

However, in the magnetic recording / reproducing apparatus illustrated in FIGS. 10 and 11 of the present invention, the annular cam member CA for adjusting the inclination of the rotary shaft 6 functions as the tilt adjusting means of the rotary shaft 6.
Besides, an annular cam member C for tilt adjustment which functions as a tilt adjustment means for the central axis of the guide portion for position regulation of the magnetic tape.
RAg is also provided, and when the magnetic recording / reproducing apparatus performs the reproducing operation in the fast-forward reproducing mode as described above, the central axes of the upper drum Du and the lower drum Dd are moved by the operation of the annular cam member CA described above. As the reference edge Te of the magnetic tape T moves away from a part of the magnetic tape position regulating guide portion GA as it is inclined by a predetermined angle, the position of the magnetic tape position regulating guide portion GA is displaced. To let
As shown in FIG. 19C, the position of the magnetic tape is regulated by the operation of the tilt-adjusting annular cam member CRAg functioning as the tilt adjusting means of the central axis of the guide for regulating the position of the magnetic tape. The upper axis of the center axis of the guide part GA is D
The reference edge T of the magnetic tape T is inclined by a predetermined slight angle in the direction of inclination of the central axes of u and the lower drum Dd.
The state in which e is correctly abutted over the entire area of the position regulation guide portion GA of the magnetic tape, and the running position of the magnetic tape T is stably held at the regular position by the position regulation guide portion GA of the magnetic tape. Therefore, the vehicle is made to travel at a predetermined traveling speed.
As shown in 0 (a), a reproduced signal showing an envelope in a good state can be obtained.

By operating the magnetic recording / reproducing apparatus shown in FIGS. 10 and 11 in the fast-forward reproduction mode (FF),
The cam follower 36 projecting from the lower drum Dd abuts the cam contour 61 of the annular cam member CA for tilt adjustment,
In addition, the cam follower 37 protruding from the lower drum Dd
Is brought into contact with the cam contour 58 of the annular cam member CA for tilt adjustment, the annular cam member CA for tilt adjustment of the rotary shaft functions as the tilt adjusting means for the rotary shaft 6 described above. The cam contour 54 of the tilt-adjusting annular cam member CRAg functioning as the tilt adjusting means of the central axis of the magnetic tape position restricting guide portion connected by the pins 66 to 68 has a magnetic tape position restricting guide. A cam follower 47 protruding from a base plate BP integral with the portion GA abuts on the base plate BP, and the annular cam member C is also used.
The cam contour 51 in RAg is brought into contact with the cam follower 48 projecting from the base plate BP integral with the magnetic tape position regulation guide portion GA.

Annular cam member CR for adjusting the inclination described above
The cam profile 54 of Ag is designed to be higher than the cam profile 51 and has the annular cam member CRA.
fulcrum plane part 3 which is configured at the same height in g
Since the fulcrum projections 49 and 50 projecting from the base plate BP are in contact with the base plates 8 and 39, the magnetic tape position regulating guide portion GA integral with the base plate BP is formed. , The fulcrum projection 49,
Two cam contours 5 on the annular cam member CRAg for tilt adjustment described above in a direction orthogonal to a straight line connecting 50.
It will be inclined by an angle corresponding to the height difference of 4,51. As a result, the center axis of the guide portion GA for regulating the position of the magnetic tape is tilted by a predetermined slight angle in the tilt direction of the center axes of the upper drum Du and the lower drum Dd, and the reference edge of the magnetic tape T is tilted. The state in which Te is in proper contact with the entire area of the position regulation guide portion GA of the magnetic tape, and the traveling position of the magnetic tape T is stably held at a regular position by the position regulation guide portion GA of the magnetic tape. Therefore, it is possible to drive at a predetermined traveling speed.

Next, when the magnetic recording / reproducing apparatus shown in FIGS. 10 and 11 is operating in the rewinding reproduction mode (FB), the cam follower 36 projecting from the lower drum Dd. Is the cam profile 6 of the annular cam member CA for tilt adjustment.
The cam follower 37 that abuts on the lower drum Dd abuts on the cam contour 60 of the annular cam member CA for tilt adjustment. The cam contour 63 of the annular cam member CA for adjusting the inclination is configured to be lower than the cam contour 60, so that the upper drum Du.
The central axes of the lower drum Dd and the lower drum Dd are shown in FIG.
Like the straight line shown by the broken line in (d), the positions of the central axes of the upper drum Du and the lower drum Dd when the magnetic recording / reproducing apparatus is operating in the normal reproduction mode are shown. Since the magnetic recording / reproducing apparatus shown in FIG. 10 has a state in which the magnetic recording / reproducing apparatus shown in FIG. The state is as illustrated in (b).

In the magnetic recording / reproducing apparatus illustrated in FIGS. 10 and 11 of the present invention, in addition to the annular cam member CA for adjusting the tilt of the rotary shaft 6, which functions as the tilt adjusting means for the rotary shaft 6,
Also provided is an annular cam member CRAg for tilt adjustment which functions as tilt adjusting means for the central axis of the guide portion for controlling the position of the magnetic tape, and as described above, the magnetic recording / reproducing apparatus performs the reproducing operation in the rewinding reproducing mode. In this case, the upper drum Du and the lower drum D are moved by the operation of the annular cam member CA described above.
As the central axis with d is inclined by a predetermined angle,
As shown in FIG. 21B, the reference edge Te of the magnetic tape T is separated from a part of the magnetic tape position regulating guide portion GA, and thus the magnetic tape position regulating guide portion GA is formed.
21C, the annular cam member CRA for tilt adjustment that functions as tilt adjusting means for the central axis of the guide portion for position regulation of the magnetic tape is displaced as shown in FIG.
By the operation of g, the guide portion GA for position regulation of the magnetic tape
The central axis of the magnetic tape T is tilted by a predetermined slight angle in the direction of inclination of the central axes of the upper drum Du and the lower drum Dd so that the reference edge Te of the magnetic tape T extends over the entire area of the position regulating guide GA of the magnetic tape. Make sure they are in proper contact,
The magnetic tape T is caused to travel at a predetermined traveling speed in a state where the traveling position of the magnetic tape T is stably held at the regular position by the magnetic tape position regulating guide portion GA, whereby an example is shown in FIG. 22 (b). As described above, a reproduced signal showing an envelope in a good state is obtained.

The magnetic recording / reproducing apparatus shown in FIGS. 10 and 11 operates by only the operation of the annular cam member CA for adjusting the inclination of the rotating shaft which functions as the inclination adjusting means of the rotating shaft 6 during the rewinding reproducing operation. , The upper drum Du when the magnetic recording / reproducing apparatus is operating in the normal reproducing mode,
21 (b) to 21 (d), the central axes of the upper drum Du and the lower drum Dd are shown with respect to the position of the central axis of the lower drum Dd (the straight line shown by O-O in FIG. 21). 21B, the reference edge Te of the magnetic tape T is shown in FIG. 21B when the upper drum Du is inclined as described above. As described above, a state in which the magnetic tape position regulating guide portion GA is separated from a part occurs, and thus the running position of the magnetic tape T is not correctly regulated by the magnetic tape position regulating guide portion GA. Since the running position of the magnetic tape T changes in the width direction of the magnetic tape, the recording trace of the magnetic tape T cannot be correctly tracked due to the rotation locus of the rotary magnetic head. For example, as shown in FIG. As illustrated That only a reproduction signal indicating the envelope having deal of variation is not obtained at the occur.

The magnetic recording / reproducing apparatus shown in FIGS. 10 and 11 is operated in the rewinding reproduction mode (FB),
The cam follower 36 projecting from the lower drum Dd contacts the cam contour 63 of the annular cam member CA for tilt adjustment,
In addition, the cam follower 37 protruding from the lower drum Dd
Is brought into contact with the cam contour 60 of the annular cam member CA for tilt adjustment, the annular cam member CA for tilt adjustment of the rotary shaft functions as the tilt adjusting means of the rotary shaft 6 described above. The cam contour 56 of the annular cam member CRAg for tilt adjustment that functions as the tilt adjusting means of the central axis of the guide portion for magnetic tape position restriction connected by the pins 66 to 68 has a guide for position control of the magnetic tape. A cam follower 47 protruding from a base plate BP integral with the portion GA abuts on the base plate BP, and the annular cam member C is also used.
The cam contour 53 at RAg is brought into contact with the cam follower 48 projecting from the base plate BP integral with the magnetic tape position regulating guide GA.

The above-mentioned annular cam member CR for adjusting the inclination
The cam profile 56 of Ag is designed to be lower than the cam profile 53, and said annular cam member CRA.
fulcrum plane part 3 which is configured at the same height in g
Since the fulcrum projections 49 and 50 projecting from the base plate BP are in contact with the base plates 8 and 39, the lower drum Dd to which the base plate BP is fixed is used for the fulcrum. In the direction orthogonal to the straight line connecting the protrusions 49, 50, the inclination is inclined by an angle corresponding to the difference in height between the two cam contours 56, 53 of the annular cam member CRAg for adjusting inclination. As a result, the central axis of the lower drum Dd is tilted by a predetermined slight angle in the direction of the central axes of the upper drum Du and the lower drum Dd, and the reference edge Te of the magnetic tape T is located at the position of the magnetic tape. The magnetic tape T is brought into proper contact with the entire area of the regulation guide portion GA, and the traveling position of the magnetic tape T is stably maintained at a regular position by the magnetic tape position regulation guide portion GA at a predetermined traveling speed. It makes it possible to drive.

The first embodiment of the magnetic recording / reproducing apparatus of the present invention described so far with reference to FIGS. 1 to 5 is the sliding of the magnetic tape on the drum structure DA including the upper drum Du and the lower drum Dd. The center axes of the upper drum Du having the contact surface 4 and the rotary magnetic head are magnetized so that the recording trace formed on the magnetic tape T and the rotation locus surface of the rotary magnetic head coincide with each other. A mechanism for inclining with respect to the central axis of the lower drum Dd, which includes a magnetic tape position regulating guide portion G for regulating the position of the reference edge Te of the tape T, and a sliding contact surface of the magnetic tape; Lower Drum Dd
So that the position control guide portion G of the magnetic tape in FIG.
The second embodiment of the magnetic recording / reproducing apparatus of the present invention described with reference to FIGS. 10 to 12 is a sliding contact surface of a magnetic tape. 4, an upper drum Du and a rotary magnetic head, a magnetic tape sliding contact surface 5 located on an extension of the magnetic tape sliding contact surface 4 of the upper drum Du, and coaxial with the upper drum Dd. A lower drum Dd that is provided in a specific manner, the above-mentioned upper and lower drums, and a rotary magnetic head,
A mechanism for integrally inclining the recording trace formed on the magnetic tape and a rotation locus surface of the rotary magnetic head to be in a state of being coincident with each other, and the above-mentioned upper and lower drums are configured separately from each other, Further, the guide portion GA for magnetic tape position regulation, which is arranged close to the outer peripheral surface of the small diameter portion 82 formed in the lower portion of the lower drum Dd, for regulating the position of the reference edge of the magnetic tape, Reference edge Te of magnetic tape T
Is a magnetic recording / reproducing apparatus configured to incline so as to match the position of the magnetic recording / reproducing apparatus, and in any of the above-described magnetic recording / reproducing apparatuses, the mechanism for inclining the drum and the position regulation of the magnetic tape. And a mechanism for inclining a member having a guide function.

Further, four kinds of modified examples of the above-mentioned second embodiment will be further described. In both the first and second embodiments described above, the drum motor Md is the lower drum D.
The upper drum Du is provided below the d and is driven to rotate via the rotary shaft 6. However, each modified example described here is shown in FIG. As shown, the rotor of the drum motor Md is directly attached to the upper drum Du, and the shaft itself that supports the upper drum Du and the lower drum Dd does not rotate. Modification 1 Hereinafter, Modification 1 of the second embodiment will be described with reference to FIGS. 26 to 31. FIG. 26 is a view corresponding to FIG. 10 previously described in the second embodiment, and FIG. 26 (a) cuts the main part of the magnetic recording / reproducing apparatus of the present invention in the direction of 90 ° -270 ° in FIG. 26 is a side cross-sectional view of FIG.
(B) is a side sectional view similarly cut in the direction of 0 ° to 180 °. Similarly, FIG. 27 is a diagram corresponding to FIG. 12 described in the second embodiment, and FIG. 27A shows a main part of the magnetic recording / reproducing apparatus of the present invention in the fast-forward reproduction mode (FF). FIG. 27B is a side sectional view taken along line 0-180 degrees in FIG. 27, and FIG. 27B similarly shows the main part of the magnetic recording / reproducing apparatus of the present invention in the rewinding reproduction mode (FB).
FIG. 3 is a side sectional view taken along line 0-180 degrees in FIG. In this modification, a drum base DB fixed to a chassis of a device (not shown), a guide portion GA for controlling the position of a magnetic tape placed on the drum base DB via seated fulcrum pins 206 and 207, and The lower drum Dd placed on the guide portion GA for position regulation of the magnetic tape via the seated fulcrum pins 202 and 203, the upper drum Du and the drum motor integrated with the lower drum Dd via the drum shaft 201. It is composed of Md and
The details will be described below.

In FIG. 26, 201 is a drum shaft, one end of which is press-fitted and fixed to the lower drum Dd.
An outer peripheral surface of the lower drum Dd is a sliding contact surface 5 around which the magnetic tape T is wound and guided, and a small diameter portion 8 having a smaller diameter than the sliding contact surface 5.
2 and a rotary transformer 13 that is arranged facing the rotary transformer 12 mounted on the upper drum Du and transmits and receives signals. Further, the drum shaft 201 has bearings 212, 21.
3, the upper drum Du is rotatably attached, and the stator 214 of the drum motor Md is attached to the other end.
Are fixed to the bearings 212, 213 via the collar 210 by the screws 215, 216 and the set screw 211 in a preloaded state. Also, for the upper drum Du,
The rotor 217 of the drum motor Md has screws 218 and 219.
Attached by the rotary magnetic head Ha,
Hb is attached by screws 16 and 17. In this way, the lower drum Dd, the upper drum Du, and the drum motor Md are integrally configured via the drum shaft 201.

On the other hand, the guide portion GA for controlling the position of the magnetic tape
Is a member separate from the lower drum Dd, the inner diameter of which is smaller than the sliding contact surface 5 of the lower drum Dd and larger than the small diameter portion 82 of the lower drum Dd, and the small diameter portion 82 of the lower drum Dd is a magnetic tape. The position control guide portion GA is loosely fitted to form a slight clearance. Also,
Leads L for guiding the reference edge Te of the magnetic tape T are formed on the upper surface of the magnetic tape position regulating guide portion GA (see FIGS. 29 and 31). As shown in FIG. 26 (a) or FIG. 29, the magnetic tape position regulating guide portion GA includes seated fulcrum pins 206 and 207 that are planted in the 90 ° -270 ° direction of the drum base DB. A fulcrum with a seat mounted on the drum base DB via the magnetic tape position control guide portion GA, which is planted in the direction 90 ° to 270 ° of the magnetic tape position control guide portion GA. The lower drum Dd is placed via the pins 202 and 203. Here, the seated fulcrum pins 206 and 207 are press-fitted and attached to the drum base DB, and
The respective tips are in a state of loosely fitting with a slight clearance into the holes 208 and 209 provided in the position regulating guide portion GA of the magnetic tape. Similarly, the seated fulcrum pins 202 and 203 are similarly press-fitted and attached to the magnetic tape position regulating guide portion GA, and their tips are slightly clearanceed from the holes 204 and 205 provided in the lower drum Dd. Is loosely fitted (see FIG. 30).

A leaf spring 220 is attached to the bottom surface 271 of the lower drum Dd with screws 221 and 222. As shown in FIG. 26 (a) or FIG. 29, the leaf spring 220 has arm portions 220 a, 2 in the direction of 90 ° -270 °.
20b are provided and these arm portions 220a, 22
Since 0b sandwiches the bottom surface 273 of the drum base DB, a force is generated to press the lower drum Dd and the magnetic tape position regulating guide portion GA against the respective bearing surfaces of the seated fulcrum pins 202, 203, 206, 207. There is. On the other hand, as shown in FIG. 26B, a spring 223 is provided between the drum base DB and the lower drum Dd at a position of 180 degrees in the cross section in the direction of 0 degrees to 180 degrees, and the seated fulcrum pin is provided. An urging force is applied to rotate the lower drum Dd counterclockwise about the straight line CL1 connecting the lines 202 and 203 as an axis. Similarly, a spring 224 is provided between the drum base DB and the magnetic tape position regulating guide portion GA at a position of 180 degrees in a cross section in the direction of 0 degrees to 180 degrees, and the seated fulcrum pin 206, An urging force is applied to rotate the magnetic tape position regulating guide portion GA counterclockwise about the straight line CL2 connecting the lines 207.

On the other hand, the guide portion GA for controlling the position of the magnetic tape
0 in the cross section of the bottom surface 274 of the direction of 0 degrees to 180 degrees
A screw hole 229 is provided at the degree position so as to penetrate through the bottom surface 274 of the magnetic tape position regulating guide portion GA, and the gear screw 227 having a gear at one end is screwed into the screw hole 229. When it fits, its tip is the lower drum D
It is in contact with the bottom surface 270 of d. Similarly, at the position of 0 degrees in the cross section of the bottom surface 273 of the drum base DB in the direction of 0 degrees to 180 degrees, the screw hole 230 has the screw hole 230.
It is provided so as to penetrate the bottom surface 273 of B, and the screw hole 230 has a gear screw 2 having a gear formed at one end.
28 is screwed together, and its tip is in contact with the bottom surface 274 of the magnetic tape position regulating guide portion GA. And
Gears formed at one ends of the gear screws 227 and 228 mesh with an intermediate gear 226 provided on the drum base DB, and when the intermediate gear 226 is rotationally driven by the motor 225, the gear screw 22
7, 228 are shown in FIG. 26 according to the rotation direction of the motor 225.
(B) In the middle, it moves forward or backward in the vertical direction.

Next, the operation of the magnetic recording / reproducing apparatus of the first modification will be described with reference to FIGS. 26 (b), 27 (a) and 27.
A brief description will be given with reference to (b). In the normal reproduction mode, as shown in FIG. 26B, the central axes of the drum shaft 1 and the magnetic tape position-regulating guide portion GA coincide with each other, and these axes are perpendicular to the surface 275 of the drum base. Has become. That is, in this state, the magnetic tape T recorded in the standard mode has its reference edge Te guided by the lead L of the position control guide portion GA of the magnetic tape and has a predetermined speed corresponding to the normal reproduction mode (VHS system VTR). When traveling at 33.35 mm / sec, the rotating magnetic head H
The rotational trajectories of a and Hb are in a state in which they coincide with the track pattern recorded on the magnetic tape T, and as shown in FIG. 20A, a reproduction signal showing a good envelope is obtained.

To change from the normal reproduction mode to the fast-forward reproduction mode (FF), as shown in FIG. 27 (a), the motor 225 is driven to drive the gear screw 227 in accordance with the fast-forward multiple speed. , 228 may be extended upward in the figure. That is, when the gear screw 227 is paid out, the tip thereof presses the bottom surface 270 of the lower drum Dd. As a result, the lower drum Dd, the upper drum Du, and the drum motor Md, which are integrally configured via the drum shaft 201, rotate clockwise around the straight line CL1 against the biasing force of the spring 223. By this rotation operation, the angle of the rotation locus surface of the rotary magnetic heads Ha and Hb with respect to the lead L of the position control guide portion GA of the magnetic tape changes, and the lead L and the rotary magnetic head Ha that match the desired fast-forward multiple speed. ，
The relative angle of the rotation trajectory plane of Hb is obtained. (Hereinafter, the correction for changing the relative angle between the lead L and the rotation locus surfaces of the rotary magnetic heads Ha and Hb described here may be referred to as "track correction" for convenience.)

Further, since the gear screw 228 is also simultaneously extended upward in the figure at this time, the tip of the gear screw 228 presses the bottom surface 274 of the guide portion GA for position regulation of the magnetic tape. As a result, the magnetic tape position regulating guide portion GA rotates clockwise around the straight line CL2 by a predetermined angle against the biasing force of the spring 224. As described above with reference to FIG. 19 in the second embodiment, this is because the magnetic tape T is pulled in the direction of rotation by the rotation of the drum structure DA associated with the track correction, so that the magnetic tape T is moved relative to the drum structure DA. On the entrance side of the magnetic tape T, the reference edge Te tends to move away from the lead L, and on the exit side, the reference edge Te.
Since e tends to be pressed against the lead L, the guide portion GA for position regulation of the magnetic tape is rotated to align the lead L with the reference edge Te of the magnetic tape T. (Less than,
The correction for rotating the lead L to match the displacement of the reference edge Te of the magnetic tape T accompanying the track correction may be referred to as "lead correction" for convenience. Therefore, even if the reference edge Te of the magnetic tape T is separated from the lead L by the track correction, the reference edge Te of the magnetic tape T is stabilized by the lead L over the entire winding range around the drum structure DA by the lead correction. 20A, when the magnetic tape T travels at the desired fast-forward multiple speed, the rotational loci of the rotary magnetic heads Ha and Hb are in a state of being coincident with the track pattern recorded on the magnetic tape T, as shown in FIG. A reproduced signal is obtained which exhibits a good envelope as illustrated.

Next, for example, in order to change the state from the normal reproduction mode to the rewinding reproduction mode (FB), the motor 225 may be rotationally driven contrary to the above-mentioned fast-forward reproduction mode (FF). . As a result, the gear screws 227 and 228 retract downward as shown in FIG. 27B, and the lower drum Dd and the magnetic tape position regulating guide portion GA are straight lines CL1 and CL1, respectively, due to the urging force of the springs 223 and 224. It is easily understood that the track correction and the lead correction are performed by rotating counterclockwise around CL2.

Modification 2 Next, Modification 2 of the second embodiment will be described with reference to FIGS. 32 to 36. In the modified example 1 described above, the seated fulcrum pins 202 and 203 are implanted in the position regulating guide portion GA of the magnetic tape to form a rotation fulcrum for track correction, and the seated fulcrum pins 206 and 207 are formed. Although the rotation fulcrum for lead correction is formed by implanting it in the drum base DB, the second modification is different only in the configuration of the rotation fulcrum, and other points are described. Modification 1
Therefore, only the structure of this rotation fulcrum will be described below, and description of other points will be omitted. FIG.
FIG. 32 (a) is a side sectional view of a main part of the magnetic recording / reproducing apparatus of the present invention cut in the direction of 90 ° -270 ° in FIG. 23, and FIG. 32 (b) is similarly taken in the direction of 0 ° -180 °. It is the sectional side view cut. Also, FIG. 7C is the same as FIG.
FIG. Similarly, FIG. 33 (a) is a side sectional view of the main part of the magnetic recording / reproducing apparatus of the present invention in the fast-forward reproduction mode (FF) taken along the direction of 0 ° -180 ° in FIG. ) Is similar to the rewind playback mode (F
FIG. 24 is a side sectional view of a main part of the magnetic recording / reproducing apparatus of the present invention at the time B) taken along the direction of 0 ° to 180 ° in FIG. 23.

In this modified example, a rotation fulcrum for rotatably supporting the lower drum Dd with respect to the position control guide portion GA of the magnetic tape for track correction and a magnetic base for the drum base for lead correction. The rotation fulcrum that rotatably supports the tape position regulating guide portion GA is constituted by a pair of common shafts 240 and 241. That is, FIG.
As shown in (a), FIG. 34, or FIG. 36, the pair of shafts 240, 241 is a guide portion G for position regulation of the magnetic tape.
The mounting plate 244 is arranged along the V grooves 242 and 243 provided on the bottom surface 274 of A in the direction of 90 degrees to 270 degrees.
It is fixed by attaching 245 with screws 246 to 249. In addition, these shafts 240, 241
The distance between the end surfaces 240a and 241a is set to the distance W between the U grooves 255 and 256 formed in the small diameter portion 254 of the lower drum Dd. It is adjusted and fixed so as to be positioned symmetrically (see FIG. 35). That is, U of the lower drum Dd
When the grooves 255 and 256 are fitted into the inner end portions 240c and 241c of the shafts 240 and 241 from above,
These shafts 240 and 241 are arranged so that the drum shaft 201 that integrally supports the upper drum Du and the lower drum Dd and the central axis of the magnetic tape position regulation guide portion GA coincide with each other. It is fixed to GA.

On the other hand, the shafts 240, 241 fixed to the position regulating guide portion GA of the magnetic tape in this manner.
The outer ends 240b and 241b thereof are received by the V grooves 250 and 251 formed in the bearing portions 276 and 277 of the drum base DB, respectively, and are rotatably supported by being pressed by the mounting plates 252 and 253. It At this time, the positioning of the magnetic tape position regulating guide portion GA with respect to the drum base DB in the directions of the shafts 240 and 241 (the left-right direction in FIG. 32A) is performed by positioning the outer peripheral surface of the magnetic tape position regulating guide portion GA. Bearing parts 276, 27 of the drum base DB
It is performed by abutting on 7. As described above, in the second modification, the rotation fulcrum for track correction is used as the shaft 24.
The inner end portions 240c, 241c of the shafts 0, 241, and the U grooves 254, 255 formed in the small diameter portion 254 of the lower drum Dd are fitted to each other, and the rotation fulcrum for lead correction is provided as the shafts 240, 241. The outer end 240b of the
241b and bearing portion 27 formed on the drum base BD
6 and 277, any rotation fulcrum has a common straight line C passing through the shaft centers of the shafts 240 and 241.
It can be placed on L3.

As described above, in the second modification, the rotation fulcrum can be arranged on the common straight line CL3 passing through the axis of the drum shaft 201. Further, since the bearing portion can be processed as a V groove or a U groove, it is easy to obtain positional accuracy in the height direction.

Modification 3 Next, with reference to FIGS. 37 and 38, modification 3 of the second embodiment.
Will be described. In the modified example 2 described above, the rotation fulcrum for track correction is used as the inner end portions 240c and 241c of the shafts 240 and 241 and the small diameter portion 254 of the lower drum Dd.
And the U-shaped grooves 254 and 255 formed on the shaft 24.
The outer end portions 240b and 241b of 0 and 241, and the bearing portions 276 and 277 formed on the drum base BD. On the other hand, in the third modified example, through holes are provided in the drum base DB, the guide portion GA for magnetic tape position regulation, and the lower drum Dd, respectively, and stepped shafts are inserted into these through holes to form a rotation fulcrum. To do. Hereinafter, the configuration of the rotation fulcrum will be described, and other points are the same as those of the second modification described above, and thus the description thereof will be omitted. FIG. 37 (a) is a side sectional view of the main part of the magnetic recording / reproducing apparatus of the present invention cut in the direction of 90 ° -270 ° in FIG. 23, and FIG. 37 (b) similarly shows 0 ° -180 °. It is a sectional side view cut in the direction. FIG. 38 shows the guide portion G for controlling the position of the drum base DB and the magnetic tape.
FIG. 6 is an exploded perspective view showing the configurations of A, the lower drum Dd, and the periphery thereof.

In this modification, a rotation fulcrum for rotatably supporting the lower drum Dd with respect to the guide portion GA for position regulation of the magnetic tape for track correction and a magnetic support for the drum base for lead correction. A pair of stepped shafts 264 and 265 are common with the rotation fulcrum that rotatably supports the tape position regulating guide portion GA. That is,
As shown in FIG. 37 (a) or FIG. 38, the drum base D
B bearing portions 278 and 279 have large through holes 266 and 2
67, medium diameter through holes 260 and 261 in the magnetic tape position regulation guide portion GA, and small diameter through hole 2 in the lower drum Dd.
62 and 263 are 90 degrees-270 in FIG. 23, respectively.
It is formed in the direction of degrees. The large-diameter step portions 264a and 265a and the medium-diameter step portions 264b and 2 are provided in these through holes.
65b, a pair of stepped shafts 264, 265 having small diameter stepped portions 264c, 265c are inserted from the outside of the drum base. Where the stepped shaft 264,
265 large diameter stepped portions 264a, 265a and drum base D
The large diameter through holes 266 and 267 of B are press-fitted, and the collar portions 264d and 265d are the bearing portions 27 of the drum base.
It is fitted up to the position where it abuts on No. 8,279 and does not fall off. Further, the fitted state of the medium-diameter step portions 264b, 265b of the stepped shafts 264, 265 and the medium-diameter through holes 260, 261 of the magnetic tape position regulation guide portion GA, and the small-diameter step portions 264c, 265c and the lower drum Dd. The fitted state with the small-diameter through holes 262 and 263 is such that the magnetic tape position regulating guide portion GA and the lower drum Dd can freely rotate. Here, in FIG. 37 (a), the drum base DB and the magnetic tape position regulating guide portion G
A and the lower drum Dd are positioned in the left-right direction by large-diameter step portions 264a and 265 of the stepped shafts 264 and 265, respectively.
a, the length of the intermediate diameter stepped portions 264b, 265b is set to a predetermined length E
2, E1. In addition, in order to fix the stepped shafts 264 and 265 to the drum base DB, V is attached to the drum base DB as in the second modification described above.
Bearing portions 276 and 277 in which grooves 250 and 251 are formed are provided, and stepped shafts 264 and 2 are provided in the V grooves 250 and 251.
65 large-diameter step portions 264a, 265a are attached to the mounting plates 252, 2
It may be fixed at 53.

As described above, in the third modification, the through holes 266, 267, 260, 261, 26 in which the rotational fulcrum for track correction and the rotational fulcrum for lead correction are formed coaxially with each other.
2, 263 and a pair of stepped shafts 264, 265 inserted into these through holes,
Similar to the second modification described above, each rotation fulcrum has a common straight line CL passing through the axial centers of the stepped shafts 264 and 265.
No. 4, the position of this straight line CL4 is the straight line CL in the modified example 2 when compared with the modified example 2.
It can be arranged at a position closer to the rotation locus surface of the rotary magnetic heads Ha and Hb than the position of 3. This means that the swing displacement in the left-right direction of the drum structure DA and the position regulating guide portion GA of the magnetic tape due to the track correction or the lead correction can be made smaller than that of the second modification in FIG. 37 (b). It is preferable in terms of the load on the magnetic tape T and the balance of the running diameter of the magnetic tape T.

Modification 4 Next, Modification 4 of the second embodiment will be described with reference to FIG. 39 and FIGS. 26 to 31 referred to in Modification 1 above. In the modified example 1 described above, both the rotation fulcrum for track correction and the rotation fulcrum for lead correction are oriented in the direction of 90 degrees to 270 degrees in FIG.
It was constructed on straight lines CL1 and CL2 passing through the axis of 01. On the other hand, the present modification 4 is different in that the rotation fulcrum for lead correction is formed on the straight line CL2 ′ which is displaced in parallel to the direction CL of FIG. 1 is basically different in its configuration. In addition, also in this modification,
The rotation fulcrum for track correction is 90 ° -27 in FIG.
Modification 1 is configured on a straight line CL1 that faces the direction of 0 degree and passes through the axis of the drum shaft 201, and other configurations.
Is the same as Therefore, the structure of the rotation fulcrum for lead correction and its function and effect will be described below, and description of other points will be omitted.

FIG. 39 is an exploded perspective view showing the structures of the drum base DB, the magnetic tape position regulation guide portion GA, the lower drum Dd, and the periphery thereof. In this modification, as shown in FIG. 39, the rotation fulcrum for track correction is the straight line C on the position regulating guide GA of the magnetic tape, as in Modification 1.
Seated fulcrum pins 202 and 203 planted on L1 (in FIG. 23, facing the direction of 90 degrees to 270 degrees and passing through the axis of the drum shaft 201) and the lower drum Dd into which the tips thereof are loosely fitted. And holes 204 and 205 formed in the. On the other hand, the rotation fulcrum for lead correction is a straight line CL2 ′ on the surface 275 of the drum base DB (Modification 1).
39. The seated fulcrum pins 231 and 232 are planted on the straight line CL2 in FIG.
And the tips thereof are formed by holes 233 and 234 formed in the position regulating guide portion GA of the magnetic tape in which they are loosely fitted.

In this modification, since the rotation fulcrum for lead correction is provided on the straight line CL2 'displaced rightward from the straight line CL2 in FIG. 23, the magnetic tape position regulation associated with the lead correction is performed. The rotation mode of the guide section GA is different from that of the first modification. That is, with the lead correction, the gear screw 228 or the spring 22
When the guide portion GA for position regulation of the magnetic tape is rotated around the straight line CL2 'by being pressed by 3, the position of the magnetic tape on the entrance side of the magnetic tape T with respect to the drum structure DA (direction of 0 degree in FIG. 23). The displacement amount of the lead L of the regulation guide portion GA is larger than the displacement amount of the lead L of the position regulation guide portion GA of the magnetic tape on the outlet side of the magnetic tape T (the direction of 180 degrees in FIG. 23). is there.

The reason why such a configuration is adopted in this modification will be described below. The inventors of the present application prototyped a device in which the first modification described above is applied to a VHS VTR. Then, using this apparatus, evaluation experiments were carried out at various speeds for fast-forward reproduction and rewinding reproduction. As a result, it was confirmed that a noiseless search without so-called noise bar was possible up to a considerably high speed in both SP mode and EP mode for fast-forward reproduction, but for rewind reproduction at a relatively low speed. Although there was no problem with, it was confirmed that the reproduction output became non-uniform at high speeds and a noise bar was generated at a certain speed.
And this tendency was especially remarkable in the EP mode.

Therefore, the inventors of the present application have clarified the cause by the lead L of the guide portion GA for position regulation of the magnetic tape.
Is cut to modify the device so that the reference edge Te of the magnetic tape T becomes substantially free, and the magnetic tape at the entrance side and the exit side of the magnetic tape T with respect to the drum structure DA is modified by using an endoscopic camera. The behavior of T was observed. As a result, the amount of rise of the magnetic tape T on the entrance side and the amount of fall of the magnetic tape T on the exit side are almost the same in the fast-forward reproduction mode, but the amount of fall of the magnetic tape T on the entrance side is in the rewind reproduction mode. It has become clear that the above-mentioned tendency tends to be larger than that at the exit side. In addition,
Although the mechanism by which such a phenomenon occurs is not necessarily clear, the magnetic tape T is wound around the drum structure DA in an inclined manner, and the magnetic tape T is drum structure DA.
It is considered that this is closely related to the fact that the position wound around and the position of the rotation fulcrum for track correction are separated from each other in the axial direction of the drum shaft 201.

As is clear from the above-described experimental results, by adopting the configuration of the fourth modification, the magnetic tape T on the entrance side and the exit side of the magnetic tape T in the drum structure DA in the rewinding reproduction mode. Since it is possible to displace the lead L of the magnetic tape position regulating guide portion GA in conformity with the imbalance between the descending amount and the ascending amount, the lead L of the magnetic tape position regulating guide portion GA can be displaced.
Allows the reference edge Te of the magnetic tape T to be stably guided over the entire winding range. As described above, in the fast-forward reproduction mode, the rotation fulcrum for lead correction is changed from CL2 to CL2 '.
It is not necessary to displace like. Therefore, the amount x by which the rotation fulcrum for lead correction should be displaced from CL2 to CL2 '.
Should be determined by the balance between the two in consideration of the performance in the fast-forward reproduction mode and the performance in the rewinding reproduction mode.

Although the configuration of the modified example 4 and the operation and effect thereof have been described above including the experimental evaluation, the contents described here can be similarly applied to the first example described above. That is, in the first embodiment, as the track correction, the upper drum Du is rotated with respect to the lower drum Dd, and as the lead correction, the lower drum Dd provided with the magnetic tape position regulating guide portion G is rotated. However, in this case, the fulcrum protrusions 49 and 50 that rotatably support the lower drum Dd are straight lines CL in the modified example 4.
It should be provided on a straight line corresponding to 2 '.

Next, referring mainly to FIGS. 6 to 9 and FIGS. 15 to 18, the third embodiment of the magnetic recording / reproducing apparatus of the present invention will be described.
An example and a fourth example will be described. Since these embodiments have many parts in common with their configurations, they will be described in parallel below. The magnetic recording / reproducing apparatus according to the third embodiment is
The central axis of the upper drum Du having the sliding contact surface 4 of the magnetic tape and the rotary magnetic head is set so that the recording trace formed on the magnetic tape and the rotation locus surface of the rotary magnetic head coincide with each other. , So that it can be inclined with respect to the central axis of the lower drum Dd provided with the magnetic tape position regulating guide portion G for regulating the position of the reference edge Te of the magnetic tape T and the sliding contact surface 5 of the magnetic tape. It has a drum structure (see FIG. 15) having a special configuration. Further, in the magnetic recording / reproducing apparatus in the fourth embodiment, the sliding contact surface 4 of the magnetic tape is used.
The upper drum Du and the rotary magnetic head, and the magnetic tape sliding contact surface 5 located on the extension surface of the magnetic tape sliding contact surface 4 of the upper drum Du. The lower drum Dd provided in
A mechanism for inclining integrally so that the recording trace formed on the magnetic tape and the rotation trajectory surface of the rotary magnetic head coincide with each other is provided, and the above-mentioned upper and lower drums Du and Dd are different from each other. The position of the reference edge of the magnetic tape is fixed to the fixed portion of the machine body in such a manner that it is formed in a body and is arranged close to the outer peripheral surface of the small diameter portion formed in the lower part of the lower drum described above. And a drum structure (see FIG. 17) having a special configuration such as a magnetic tape position regulating guide portion. In these embodiments, by changing the running position of the magnetic tape, the position of the reference edge Te of the magnetic tape is provided on the drum structure DA side. ), Variable height guide poles SGRv, TGRv, which are constructed as a structure that can be displaced in the width direction of the magnetic tape, are arranged in the running path of the magnetic tape. By providing a drive mechanism that changes the heights of the variable guide poles SGRv and TGRv in a predetermined manner, a noise bar does not appear even when the recording trace formed on the magnetic tape has a small recording trace width. A magnetic recording / reproducing apparatus capable of performing high-speed reproduction and rewinding reproduction by means of a magnetic recording / reproducing apparatus, and a typical configuration example thereof is shown in FIGS. 6 and 8.

In FIGS. 6A and 8, DA is a drum structure, and as the drum structure DA, for example, one having a configuration mode as illustrated in FIG. 15 or 17 is used. be able to. The drum structure DA illustrated in FIG. 15 corresponds to the drum structure DA in the magnetic recording / reproducing apparatus described above with reference to FIGS. 1 and 2.
This is a configuration mode in which components such as the base plate BP and the annular cam member CRA for tilt adjustment which functions as the tilt adjustment means of the central axis of the lower drum are omitted, and the drum structure illustrated in FIG. DA is a ring for tilt adjustment that functions as tilt adjustment means for the center axis of the base plate BP or the guide portion GA for position regulation of the magnetic tape from the drum structure DA in the magnetic recording / reproducing apparatus described above with reference to FIGS. The cam drum CRAg of FIG. 15 is omitted, and the lower drum Dd and the lower drum Dd in the drum structure DA shown in FIG.
The magnetic tape position regulating guide portion GA in the drum structure DA shown in FIG. 17 is fixed to the fixed portion of the machine body.

Drum structure DA shown in FIG. 1 and FIG.
5, the components corresponding to each other in the drum structure DA shown in FIG.
In addition, since the same reference numerals are given to corresponding components in the drum structure DA shown in FIG. 10 and the drum structure DA shown in FIG. 17, the respective drum structures described above are attached. The structural differences between DAs will be immediately apparent. That is, in the drum structure DA shown in FIG. 1, the springs 30 and 31 are attached to the holes 75 and 76 provided on the upper surface side of the base plate BP, and
The springs 34 and 35 are attached to the holes 77 and 78 provided on the lower surface side of the base plate BP. In the drum structure DA shown in FIG. 15, the springs 30 and 31 are provided on the upper surface side of the drum base DB. 15 and the springs 34 and 35 are attached to the holes 92 and 93 provided on the lower surface side of the drum base DB, and the lower drum of the drum structure DA shown in FIG. D
d is directly fixed to the drum base DB by a screw 94, and functions as a base plate BP provided in the drum structure DA shown in FIG. 1 and a tilt adjusting means for the central axis of the lower drum. It is immediately apparent that the components such as the annular cam member CRA for tilt adjustment are omitted.

Similarly, in the drum structure DA shown in FIG. 10, the springs 86 and 87 are connected to the base plate BP.
Of the base plate BP, the springs 34 and 35 are attached to the holes 77 and 78 of the base plate BP, and the rotation fulcrums 28 and 29 are attached to the base plate BP and the lower drum. Although it is provided between Dd,
In the drum structure DA shown in FIG.
6, 87 are holes 96 provided on the lower surface side of the drum base DB,
95, the springs 34 and 35 are attached to the holes 97 and 98 provided on the lower surface side of the drum base DB, and the pivots 28 and 29 are provided between the drum base DB and the lower drum Dd. A certain point, and the guide portion GA for regulating the position of the magnetic tape in the drum structure DA shown in FIG. 17 is directly fixed to the drum base DB by the screw 99, and the drum structure DA shown in FIG.
The components such as the base plate BP provided therein and the annular cam member CRAg for tilt adjustment that functions as the tilt adjustment means of the central axis of the guide portion GA for position regulation of the magnetic tape are omitted. Is immediately understood.

In the drum structure DA illustrated in FIG. 15, the annular cam member CA for adjusting the tilt of the rotary shaft 6 which functions as the tilt adjusting means for the rotary shaft 6 is used as shown in FIG.
An annular cam member C having a configuration as illustrated in FIG.
When A is used, the arcuate gear 65 is driven by the rotation of a pinion (not shown), and the annular cam member CA rotates in the guide groove 100 provided on the upper surface of the drum base DB. When moved, the cam contours 58 to 63 of the annular cam member CA for tilt adjustment are brought into contact with the cam followers 36 and 37 protruding from the support member SA.
Will change sequentially. Further, in the drum structure DA illustrated in FIG. 17 described above, as an annular cam member CA for adjusting the inclination of the rotating shaft, which functions as an inclination adjusting unit of the rotating shaft 6, as illustrated in FIG. When the annular cam member CA of the configuration mode is used, the arcuate gear 65 is driven by the rotation of a pinion (not shown), and the annular cam member CA is provided on the upper surface of the drum base DB. When rotated in the guide groove 100, the cam profile of the annular cam member CA for tilt adjustment brought into contact with the cam followers 36, 37 protruding from the bottom portion 83 of the small diameter portion 82 of the lower drum Dd. 58-63
Will change sequentially.

When the magnetic recording / reproducing apparatus using the drum structure DA illustrated in FIG. 15 (or FIG. 17) is operating in the normal reproducing mode, for example,
Support member SA (or small diameter portion 82 in lower drum Dd)
The cam follower 36 protrudingly provided at the bottom portion 83) of the cam contacts the cam contour 62 of the annular cam member CA for tilt adjustment,
Support member SA (or small diameter portion 82 in lower drum Dd)
The cam follower 37 protrudingly provided on the bottom portion 83) of the cam contacts the cam contour 59 of the annular cam member CA for tilt adjustment. ), The support member S
A (or the bottom portion 8 of the small diameter portion 82 in the lower drum Dd)
The cam follower 36 projecting from 3) contacts the cam contour 61 of the annular cam member CA for tilt adjustment, and the support member S
A (or the bottom portion 8 of the small diameter portion 82 in the lower drum Dd)
The cam follower 37 protrudingly provided in 3) comes into contact with the cam contour 58 of the annular cam member CA for tilt adjustment.

As described above, since the cam profile 61 of the annular cam member CA for adjusting the inclination is higher than the cam profile 58, the upper drum Du and the support member SA ( Or upper drum Du and lower drum D
When the magnetic recording / reproducing apparatus is operating in the fast-forward reproduction mode, the central axis of FIG.
8 (a)}, the magnetic recording / reproducing apparatus in the normal reproducing mode is operated as shown in FIG.
(Or FIG. 17) It is in a state of being inclined to the right with respect to the position of the central axis of the upper drum Du and the supporting member SA (or the upper drum Du and the lower drum Dd) shown in FIG.

Next, when the magnetic recording / reproducing apparatus using the drum structure DA illustrated in FIG. 15 (or FIG. 17) is operating in the rewinding reproduction mode (FB), for example, The cam follower 36 protruding from the support member SA (or the bottom portion 83 of the small diameter portion 82 of the lower drum Dd) abuts the cam contour 63 of the annular cam member CA for tilt adjustment, and also the support member SA. (Or lower drum Dd
The cam follower 37 protrudingly provided on the bottom portion 83) of the small-diameter portion 82 at the position abuts on the cam contour 60 of the annular cam member CA for tilt adjustment. Since the cam contour 63 of the annular cam member CA for adjusting the inclination is configured to be lower than the cam contour 60, the upper drum Du and the support member SA (or the upper drum Du and the lower drum Dd). When the magnetic recording / reproducing apparatus is operating in the rewinding reproducing mode, the central axes of and are shown in FIG.
15B in the case where the magnetic recording / reproducing apparatus is operating in the normal reproducing mode, as shown in FIG.
(Or FIG. 17) It is in a state of being inclined leftward with respect to the position of the central axis of the upper drum Du and the supporting member SA (or the upper drum Du and the lower drum Dd) shown in FIG.

By the way, the above-mentioned FIG. 15 (or FIG.
Since the magnetic recording / reproducing apparatus using the drum structure DA exemplified in 7) operates in the fast-forward reproduction mode (FF) or the rewinding reproduction mode (FB), for example, the above-mentioned annular cam member CA is used. The central axes of the upper drum Du and the support member SA (or the upper drum Du and the lower drum Dd) are shown in FIG. 15 (or FIG. 17) when the magnetic recording / reproducing apparatus is operating in the normal reproducing mode by the operation. When the center axis of the upper drum Du and the supporting member SA (or the upper drum Du and the lower drum Dd) that are being held is inclined to the right (or) left, As described above, the upper drum Du and the supporting member SA
The reference edge Te of the magnetic tape T is illustrated in FIG. 19 (b) {or 21 (b)} as the central axes of (or the upper drum Du and the lower drum Dd) are inclined by a predetermined angle. As described above, a state occurs in which the magnetic tape is positioned away from a part of the magnetic tape position regulating guide portion G (or the magnetic tape position regulating guide portion GA) formed on the outer peripheral portion of the lower drum Dd. Since the traveling position of the magnetic tape T is not correctly regulated by the magnetic tape position regulating guide portion G, and the traveling position of the magnetic tape T changes in the width direction of the magnetic tape, the rotation of the rotary magnetic head is increased. Due to the locus, the recording trace of the magnetic tape T cannot be correctly traced, and only a reproduction signal showing an envelope with a large fluctuation occurs.

The magnetic recording / reproducing apparatus shown in FIGS. 6A and 8 respectively uses the drum structure DA as illustrated in FIG. 15 (or FIG. 17) as described above. Since the device operates in the fast-forward reproduction mode (FF) or the rewind reproduction mode (FB), the upper drum Du and the support member SA (or the upper drum Du and the lower drum Dd) are operated by the operation of the annular cam member CA described above. The central axis of the upper drum Du and the supporting member SA (or the upper drum Du and the lower drum Dd) shown in FIG. 15 (or FIG. 17) when the magnetic recording / reproducing apparatus operates in the normal reproducing mode. ) With respect to the position of the center axis of the upper drum Du and the supporting member SA (or the upper drum Du and the lower drum Dd), the center axes of the upper drum Du and the supporting member SA are inclined by a predetermined angle. Accordingly, the reference edge Te of the magnetic tape T is separated from a part of the magnetic tape position regulating guide portion G (or the magnetic tape position regulating guide portion GA) formed on the outer peripheral portion of the lower drum Dd. The problem that the traveling position of the magnetic tape T is not correctly regulated by the position regulating guide portion G of the magnetic tape due to the occurrence of such a state is solved by changing the position of the magnetic tape traveling path before and after the drum structure DA. It is of such a configuration mode that can be performed.

In the magnetic recording / reproducing apparatus shown in FIGS. 6 (a) and 8 respectively, the drum structure DA used as a part of the components thereof is as described above with reference to FIG. However, even if the drum structure DA having the structure described above with reference to FIG. 17 is used, or the inclination angle of the central axis of the drum structure is changed in accordance with the change of the recording / reproducing mode. It is needless to say that the drum structure DA having another configuration configured to be changed may be used. In FIGS. 6A and 8, the lower drum Dd of the drum structure DA is fixed to the drum base DB, and the upper drum Du has the rotation shaft 6 as exemplified in FIG. In accordance with the rotational movement of the annular cam member CA for adjusting the inclination of the rotary shaft that functions as the inclination adjusting means of the rotary shaft of the drum assembly DA, in a plane including the rotary shaft in the direction of 0 ° to 180 ° in the drum structure DA. Can be tilted.

In the magnetic recording / reproducing apparatus shown in FIG. 6A, Mg is a motor with a speed reducer, and a pinion 102 is fixedly attached to its output shaft 101. The pinion 102 is meshed with an arcuate gear 65 provided on the annular cam member CA via a connecting portion 64. Then, when the rotational force of the motor driven according to the control operation by the control unit (not shown) is transmitted to the annular cam member CA via the output shaft 101, the pinion 102, and the connecting portion 64, the annular cam member CA. C
In A, the tilt angle of the rotary shaft 6 is changed by the operation as described above. A connecting pin 103 is planted in the above-mentioned connecting portion 64, and penetrates through a hole 104 formed in an intermediate portion of the arcuate actuating member FA. Two actuators 1 are provided at each end of the arcuate actuating member FA.
05-108 are provided.

As shown concretely in FIG. 6B, each of the above-mentioned actuating bodies 105 to 108 is provided with a plurality of cam contours 109 to 120, respectively. The plurality of cam contours 109 to 120 formed on the actuating bodies 105 to 108 are provided with variable height guide poles SGR.
The lower surface of the lower flange 135 in v and TGRv is abutted as a cam follower. Between the operating body 105 and the operating body 106, and between the operating body 107 and the operating body 1 described above.
08, the height of the variable guide pole SGRv, T
Gaps 121 and 122 are provided so that the cylindrical portion 140 (FIG. 7) protruding downward from the lower flange 135 of the GRv and penetrating the shaft 134 can be inserted. The above-mentioned arc-shaped actuating member FA has elongated holes 123,
124 is provided, and the guide holes 127 and 12 provided in the drum base DB are provided in the long holes 123 and 124.
Corresponding ones of the guide pins 125 and 126 implanted in the No. 8 penetrate.

The arcuate actuating member FA is driven by a motor Mg with a speed reducer, and the rotational force of the output shaft 101 is applied to the arcuate gear 65 via the pinion 102, whereby an annular cam member is formed. In the guide groove 100 (FIG. 15) provided on the upper surface of the drum base DB integrally with the connecting portion 64 by the connecting pin 103 planted in the connecting portion 64 when the CA performs the pivoting operation. Rotate and work with. The arcuate actuating member FA is an arcuate actuating member FA when the height-adjustable guide poles SGRv, TGRv attached to the loading mechanism are in the correct positions to be positioned during the recording / reproducing operation. Two actuating elements 105, 106, 10 arranged at both ends of the
The portions of the gaps 121 and 122 in 7 and 108 are the height-adjustable guide poles SGRv and TGR.
The guide groove 12 provided in the drum base DB with the tubular portion 140 protruding downward from the lower flange 135 (FIG. 7) at v.
Since the arcuate actuating member FA, as described above, is configured to have a curvature such that it can be guided by 7, 128 to perform a rotary operation, when the arc-shaped actuating member FA performs a rotary operation, a circle is formed. Two actuating members 105, 106, 107, 108 formed at both ends of the arc-shaped actuating member FA.
Of the plurality of cam contours 109 to 120 provided in the above sequentially contact the lower surface of the lower flange 135 of the height-adjustable guide poles SGRv and TGRv functioning as cam followers.

FIG. 7 shows a concrete configuration example of the height-adjustable guide pole SGRv on the supply side and the height-adjustable guide pole TGRv on the tick-up side, and the magnetic recording / reproducing apparatus operates in the normal reproduction mode. 2), the arc-shaped actuating member FA is arranged at both ends of the operation member FA, when operating in the fast-forwarding reproduction mode (FF) and when operating in the rewinding reproduction mode (FB). By the plurality of cam contours 109 to 120 provided on the individual actuating bodies 105, 106, 107, 108, the above-mentioned supply side height-adjustable guide pole SGRv and the tick-up side height-adjustable guide pole are provided. FIG. 6 is a diagram illustrating and explaining how the height of TGRv (the position of the traveling path of the magnetic tape) changes. 7 (a),
(B) shows the operating bodies (105, 106, 107, 108) formed at both ends of the arcuate operating member FA when the magnetic recording / reproducing apparatus is operating in the normal reproducing mode.
The height of the height-adjustable guide poles SGRv, TGRv (position of the magnetic tape running path) is restricted by a selected one of the plurality of cam contours (109 to 120) provided in the. Is shown.

7 (c) and 7 (d), when the magnetic recording / reproducing apparatus is operating in the fast-forward reproducing mode, the actuating members (10) formed at both ends of the arcuate actuating member FA are shown.
5, 106, 107, 108) selected from a plurality of cam profiles (109-120)
1, 118, 114, and 115 show a state in which the height of the height-adjustable guide poles SGRv and TGRv (the position of the magnetic tape running path) is restricted. By the way, the drum structure D as illustrated in FIG.
When the magnetic recording / reproducing apparatus having the structure shown in FIG. 6A using A is operated in the fast-forward reproduction mode (FF),
When the magnetic recording / reproducing apparatus operates in the normal reproduction mode, the central axes of the upper drum Du and the supporting member SA are moved by the operation of the annular cam member CA, and the upper drum Du and the supporting member are shown in FIG. When tilted with respect to the position of the central axis with respect to SA, the above-mentioned upper drum Du and supporting member S
As shown in FIG. 19B, the reference edge Te of the magnetic tape T along with the inclination of the central axis with respect to A is formed on the outer peripheral portion of the lower drum Dd. The state where the reproduction signal is deteriorated due to a state where the tape is separated from a part of the position control guide portion G of the tape.
However, in the magnetic recording / reproducing apparatus having the configuration shown in FIG.
When it is operating in the fast-forward reproduction mode, the height of the height-adjustable guide poles SGRv, TGRv (position of the magnetic tape running path) is as shown in FIGS. 7 (c) and (d). 19D, the reference edge Te of the magnetic tape T extends over the entire magnetic tape position regulating guide portion G formed on the outer peripheral portion of the lower drum Dd, as illustrated in FIG. 19D. In the guided state, the magnetic tape T is in a stable running state, and a reproduction signal in a good state can be obtained.

7 (e) and 7 (f), when the magnetic recording / reproducing apparatus is operating in the rewinding reproducing mode, the actuating members (105, 1) formed at both ends of the arcuate actuating member FA are shown.
06, 107, 108) and a selected one of a plurality of cam contours (109-120) 109, 1
20, 112 and 117 show the state in which the heights of the variable height guide poles SGRv and TGRv (the positions of the magnetic tape running path) are restricted. By the way, when the magnetic recording / reproducing apparatus having the configuration shown in FIG. 6A, which uses the drum structure DA as illustrated in FIG. 15 described above, is operated in the rewinding reproduction mode (FB), The operation of the cam member CA causes the upper drum Du and the supporting member S to move.
When the central axis of A is tilted with respect to the central axis position of the upper drum Du and the support member SA shown in FIG. 15 when the magnetic recording / reproducing apparatus is operating in the normal reproducing mode, As shown in FIG. 21B, the reference edge Te of the magnetic tape T is increased as the central axes of the upper drum Du and the supporting member SA are inclined by a predetermined angle, and The state where the reproduction signal is deteriorated due to the state where the magnetic tape is separated from a part of the position regulation guide portion G of the magnetic tape formed in the portion. However, in the magnetic recording / reproducing apparatus having the configuration shown in FIG. 6A, when the magnetic recording / reproducing apparatus is operating in the fast-forward reproduction mode, the height of the height-adjustable guide poles SGRv, TGRv (the position of the magnetic tape running path ) Is set in the state as shown in FIGS. 7E and 7F, the reference edge Te of the magnetic tape T is the outer peripheral portion of the lower drum Dd as illustrated in FIG. 21D. Guide portion G for controlling the position of the magnetic tape formed on the
The magnetic tape T being guided over the entire
Becomes a stable traveling state, and a reproduction signal in a good state can be obtained.

The variable height guide pole SGRv and the variable height guide poles SGRv, TGRv may have the same configuration as shown in FIG.
The height-adjustable guide pole SGRv (TGRv) is a support portion P attached to the substrate 129 of the loading mechanism.
It is configured to be vertically displaceable with respect to S. The support part PS is composed of two supporting components 130 and 138 which are provided so as to sandwich the substrate 129 of the loading mechanism. The support portion PS is fixed to the substrate 129 of the loading mechanism by sandwiching and coupling.

Support component parts 130, 138 of the support part PS
Among the above, a hollow portion 131 is provided below the supporting component portion 130 provided below the substrate 129 of the loading mechanism, and the hollow portion 13 is provided.
A slit S is formed on the outer wall of a part of 1. In addition, the support component parts 130 and 138 of the support part PS described above.
A shaft 134 is inserted through a hole provided at the center of the shaft, and a pin 132 is fixed to the end of the shaft 134.
When the shaft 134 moves in the vertical direction, both ends of the pin 132 are guided by the slits S provided in the outer wall of a part of the hollow portion 131, so that the shaft 1
The detent operation of 34 is performed. Also, the above-mentioned pin 1
Between the shaft 32 and the bottom of the hollow portion 131, the shaft 1
Spring 1 that always operates to urge 34 downward
33 are mounted.

Further, the supporting component part 1 of the supporting part PS described above.
A hollow portion 139a having a diameter larger than the diameter of the shaft 134 is formed in the small diameter portion 140 of the upper portion of the supporting component portion 138 provided above the substrate 129 of the loading mechanism among the members 30, 138. The hollow part 1
The height of the guide pole SGR is variable in the annular space formed around the shaft 134 passing through the center of the shaft 39a.
In the v and TGRv, the cylindrical portion 1 is provided so as to project downward from the lower surface of the lower flange 135 and penetrates the shaft 134.
It functions as a guide portion when the 40 is moved in the vertical direction. 1
A roller 37 having a length corresponding to the width of the magnetic tape is rotatably mounted on the shaft 134. An upper flange 136 is fixed to the upper end of the shaft 134 described above. Therefore, the magnetic tape T is in sliding contact with the peripheral surface of the roller 137 provided between the upper surface of the lower flange 135 and the lower surface of the upper flange 136, and the upper surface of the lower flange 135 and the upper flange. The vehicle travels in a state where the position in the width direction is restricted by the lower surface of 136.

According to the reproduction mode of the magnetic recording / reproducing apparatus,
When the above-mentioned arcuate actuating member FA is pivotally operated, the above-mentioned arcuate actuating member FA supports the support portion PS at the height-adjustable guide pole SGRv (TGRv) at the bottom surface thereof. Each of the two actuating members 105, 106, 107, 108 which are in sliding contact with the end face of the small diameter portion 140 formed on the upper part of the constituent portion 138 and which are formed on both ends of the arcuate actuating member FA, respectively. Of the lower flange 13 in the height-adjustable guide poles SGRv, TGRv.
In the state of sandwiching the tubular portion 140 protruding downward from 5 and penetrating the shaft 134, it is guided by guide grooves 127 and 128 provided in the drum base DB to perform the pivoting operation.

As described above, when the arcuate actuating member FA is pivotally moved, two actuating members 105, 106 formed at both ends of the arcuate actuating member FA, respectively.
A plurality of cam contours 109 provided on 107 and 108
7 to 120 sequentially contact the lower surface of the lower flange 135 of the height-adjustable guide poles SGRv and TGRv functioning as cam followers, as shown in FIG. According to the reproduction mode of the magnetic recording / reproducing apparatus, the height of the height-adjustable guide poles SGRv, TGRv (the position of the magnetic tape running path) is changed to a predetermined state as shown in each drawing of FIG. hand,
Regardless of the reproduction mode in which the magnetic recording / reproducing apparatus operates, the reference edge Te of the magnetic tape T is entirely covered by the position regulating guide portion G of the magnetic tape formed on the outer peripheral portion of the lower drum Dd. As the guided state, the magnetic tape T is brought into a stable running state, so that a reproduction signal in a good state can be obtained.

An arcuate actuating member F shown in FIGS. 6A, 6B and 7 (the same applies to FIG. 8 described later).
A is two actuators (1
05, 106, 107, 108) has a plurality of specific cam contours (109 to 120),
The arcuate actuating member FA shown in FIG. 9 has two actuating members provided at both ends thereof (only one actuating member is shown in FIG. 9; Is displayed), but the cam profile 14 has a uniform inclined surface.
9, 151) is an example of the configuration in the case of being configured as the configuration mode. In addition, the operating body FAf provided at both ends of the arcuate operating member FA also has the bottom surface of the guide pole SGRv (TGR) whose height is variable.
In the above-mentioned height by the two parts which are in sliding contact with the end face of the small diameter part 140 formed on the upper part of the support component part 138 of the support part PS in v) and are arranged in parallel in the vicinity of the tip end thereof. Variable guide poles SGRv, TGR
The rotary operation is performed with the tubular portion 140 protruding downward from the lower flange 135 at v and having the shaft 134 penetrating there between.

When an arcuate actuating member FA having an actuating member FAf having cam contours 149 and 151 having uniform inclined surfaces as shown in FIG. 9 is used, When the arcuate actuating member FA is pivotally moved, the cam contours 149, 151 having uniform inclined surfaces in the actuating body FAf formed at both ends of the arcuate actuating member FA become Since the heights of the variable guide poles SGRv, TGRv of the height adjustable guide poles SGRv, TGRv are in contact with the lower surface of the lower flange 135 of the variable height guide poles SGRv, TGRv, , It will be in a state of stepless change.
Height-adjustable guide poles SGRv, TGR as described above
When the height of v (the position of the running path of the magnetic tape) is changed steplessly, the height of the above-mentioned variable height guide poles SGRv, TGRv (the running path of the magnetic tape). Corresponding to the stepless change mode of the position), the inclination angle of the central axis of the upper drum Du and the support member SA (or the upper drum Du and the lower drum Dd) can be changed steplessly. It is a desirable embodiment to use an annular cam member CA having a different cam profile. The structure of the height-adjustable guide poles SGRv, TGRv shown in FIG. 9 is the same as that of the height-adjustable guide poles SGRv, TGRv described with reference to FIG. The description is omitted.

In the magnetic recording / reproducing apparatus of the present invention described above with reference to FIG. 6, an annular cam member CA for changing the inclination angle of the central angle of the drum structure DA according to the reproducing mode of the magnetic recording / reproducing apparatus. Of the guide pole SGRv, T whose height is variable according to the rotational movement of the magnetic pole and the reproducing mode of the magnetic recording / reproducing apparatus.
The rotation of the arcuate actuating member FA for changing the height of GRv (position of the traveling path of the magnetic tape) is performed by using the power from one driving source. The drive source for rotating and rotating the annular cam member CA for changing the inclination angle of the central angle of the drum structure DA according to the reproduction mode of the magnetic recording / reproducing apparatus, and the reproduction of the magnetic recording / reproducing apparatus. Separately from a driving source for rotating the arcuate actuating member for changing the height of the guide poles SGRv, TGRv (position of the magnetic tape running path) whose height is variable according to the mode. Then, the magnetic recording / reproducing apparatus of the present invention may be configured. An example of the configuration is shown in FIG.
Shown in

In the magnetic recording / reproducing apparatus shown in FIG.
Each of g, Mg1 and Mg2 is a motor with a speed reducer, and a pinion 102 is fixed to the output shaft 101 of the motor Mg with a speed reducer.
Reference numeral 2 denotes a rotational force of a motor which is meshed with an arcuate gear 65 provided on the above-mentioned annular cam member CA via a connecting portion 64 and which is driven by a control operation by a control unit (not shown). Output shaft 101 and pinion 1
02, the arcuate gear 65, and the connecting portion 64, the magnetic recording / reproducing apparatus is rotated by the rotation of the annular cam member CA, and the magnetic recording / reproducing apparatus operates as described above. The tilt angle is changed.

Further, the motor Mg1 with the decelerator described above
The pinion 142 is fixed to the output shaft 141 of
The pinion 142 is meshed with an arc gear 143 provided on the arc actuating member FAf1. Furthermore, a pinion 145 is fixedly attached to the output shaft 144 of the motor Mg2 with a decelerator described above.
Reference numeral 5 is meshed with an arc gear 146 provided on the arc actuating member FAf2. The above-mentioned arcuate actuating members FA1 and FA2 are the above-mentioned motor Mg with a speed reducer.
1, when the Mg2 is driven according to a control operation by a control unit (not shown), the motors Mg1 and Mg2 each provided with the above-described reducer and the individual arc-shaped actuating members FA1 and FA2 are provided. By the power transmission by the power transmission system between and, the rotary movement is performed in the arc-shaped guide grooves 147 and 148 respectively provided in the drum base DB. 155 is a long hole formed in the arcuate actuating member FA1, 157 is a long hole formed in the arcuate actuating member FA2, and 156 and 158 are pins implanted in the base plate DB. is there.

Actuators FAf1 and FAf2 are provided at one end of each of the above-mentioned arcuate actuating members FA1 and FA2. The actuating members FAf1 and FAf2 are formed of two parts arranged in parallel with gaps 153 and 154. . In FIG. 8 (see also FIG. 9), the operating body FAf1 provided at one end of the arcuate operating member FA1 has a cam profile 149 with a uniform inclined surface, It is said that the two parts, that is, the part having the cam contour 150 formed by such an inclined surface, are arranged side by side with a gap 153, and the arc-shaped actuating member FA2.
The actuator FAf2 provided at one end of the two parts has a cam profile 151 with a uniform inclined surface and a cam profile 152 with a uniform inclined surface. It is said that the configuration is such that the gaps 154 are provided side by side.

The operating body FAf1 provided at one end of the arcuate operating member FA1 and the operating body FAf2 provided at one end of the arcuate operating member FA2 are the arcuate operating member FA1. And the arcuate actuating member FA2, when the pivoting operation is performed as described above, the bottom surface of the actuating member FA2 is located above the support constituent portion 138 of the support portion PS in the guide poles SGRv, TGRv. By the two portions that are slidably contacting the end surface of the small diameter portion 140 that is configured and that are arranged in parallel near the tip of the small diameter portion 140, the lower portion of the lower flange 135 of the height-adjustable guide poles SGRv, TGRv is lowered. Rotation is performed while sandwiching a cylindrical portion 140 that is projected and has a shaft 134 penetrating therethrough.

Actuators FAf1, F having the cam contours 149 to 152 having the uniform inclined surface as described above are formed.
When the arcuate actuating members FA1 and FA2 provided with Af2 are used, when the arcuate actuating members FA1 and FA2 rotate and operate, the arcuate actuating members FA1 and FA2 are
Actuators FAf1 and FAf formed at one end of FA2
Cam profile 149-15 with uniform slope in 2
Since 2 is in contact with the lower surface of the lower flange 135 of the height-adjustable guide poles SGRv, TGRv functioning as cam followers, the height-adjustable guide pole SG
Height of Rv and TGRv (position of magnetic tape running path)
Will be in a state of continuous change. As described above, when the heights of the height-adjustable guide poles SGRv and TGRv (positions of the magnetic tape running path) are changed steplessly, the height-adjustable guide pole S described above is used.
Height of GRv, TGRv (position of magnetic tape running path)
A cam capable of continuously changing the inclination angle of the central axis of the upper drum Du and the support member SA (or the upper drum Du and the lower drum Dd) corresponding to the stepless change mode of the cam. It is a desirable embodiment to use an annular cam member CA with a contour.

As the cam contours formed on the actuating bodies FAf1 and FAf2 formed at one end of the arcuate actuating members FA1 and FA2, for example, a plurality of stepwise cam contours as illustrated in FIG. Of course, the arc-shaped actuating members FA1 and FA2 may be integrated and rotated by one motor with a speed reducer. However, like the magnetic recording / reproducing apparatus illustrated in FIG. 8, two arcuate actuating members FA1 and FA2 are used, and each arcuate actuating member FA1 and FA2 is configured at one end. The height of the variable guide pole SGRv on the supply side (position of the magnetic tape running path) and the variable guide pole T on the take-up side are controlled by the actuating elements FAf1 and FAf2.
When the height of GRv (the position of the magnetic tape running path) can be changed individually, the height of the height-adjustable guide poles SGRv and TGRv (the position of the magnetic tape running path) can be changed. Changes can be diversified.

In the magnetic recording / reproducing apparatus shown in FIG. 8, the drive of each of the motors Mg, Mg1, Mg2 described above is controlled according to the control operation by the control unit (not shown) in accordance with the reproduction mode to drive each of the driven motors. The annular cam members CA, 2 for changing the inclination angle of the central angle of the drum structure DA as described above by applying the rotational force of the drum via the respective power transmission systems.
The rotation of the annular cam member CA for changing the inclination angle of the central angle of the drum structure DA in accordance with the reproduction mode by transmitting to the individual arcuate actuating members FA1, FA2 causes the drum structure DA to move. Inclining the central angle by the angle required in each playback mode,
The height-adjustable guides on the supply side are rotated by rotating the arcuate actuating members FA1 and FA2 in accordance with the reproduction mode, and by actuating members FAf1 and FAf2 configured at one end of the arcuate actuating members FA1 and FA2. The height of the pole SGRv (the position of the magnetic tape running path) and the height of the take-up side variable height guide pole TGRv (the position of the magnetic tape running path) are required in each playback mode. Since the height is changed so that the height becomes higher, it is possible to always obtain a good reproduction signal regardless of the change in the reproduction mode.

In the magnetic recording / reproducing apparatus shown in FIGS. 6 and 8, the rotation amount of the annular cam member CA to be changed according to the change of the reproducing mode and the reproducing mode of the magnetic recording / reproducing apparatus are set. In order to control the amount of rotation of the arcuate actuating members FA, FA1, FA2, etc., which should be changed in accordance with the above, for example, a position sensor is provided in the above-mentioned constituent member that performs each rotation operation, and output from the position sensor. This can be easily performed by operating each drive source (motor) by a control signal generated by a control unit (not shown) based on the obtained position information. A control circuit selected from the above may be adopted.

[0147]

As is apparent from the above detailed description, the magnetic recording / reproducing apparatus of the present invention is a magnetic tape wound around a part of the peripheral surface of a drum including an upper drum and a lower drum. In the magnetic recording / reproducing apparatus in which the recording / reproducing operation is performed by using the rotating magnetic head, the center axis between the upper drum having the sliding contact surface of the magnetic tape and the rotating magnetic head controls the position of the reference edge of the magnetic tape. First tilting means which is provided with a tape position regulating guide portion and a sliding surface of the magnetic tape and which is inclined to the central axis of the lower drum, and the position regulation of the magnetic tape on the lower drum. The guide portion for driving is configured to include a second tilt drive means for tilting the lower drum so as to form a bear which matches the position of the reference edge of the magnetic tape, or the upper and lower drums. Become A magnetic tape wound around a part of the peripheral surface of a ram is provided with a sliding contact surface of the magnetic tape in a magnetic recording / reproducing apparatus in which a recording / reproducing operation is performed by using a rotating magnetic head. The head, the lower drum provided coaxially with the upper drum, which is provided on the extension surface of the sliding contact surface of the magnetic tape on the upper drum, and the lower drum described above, The first tilt drive means for tilting the drum and the rotary magnetic head integrally, and the above-mentioned upper and lower drums are constructed separately from each other, and have a small diameter formed under the lower drum. A second position guide portion for controlling the position of the reference edge of the magnetic tape, which is arranged close to the outer peripheral surface of the magnetic tape, is inclined so as to match the reference edge position of the magnetic tape. With tilt drive means Since those configured as having, it can be matched to the recorded traces formed on the magnetic tape and the rotation locus surface of the rotary magnetic head. Further, in the magnetic recording / reproducing apparatus of the present invention, when the inclination of the central axis of the upper drum and the rotating magnetic head or the inclination of the central axis of the upper drum, the rotating magnetic head and the lower drum is changed corresponding to the change of the reproducing mode. In the above, the reference edge of the magnetic tape is well guided over the entire position regulation guide portion of the magnetic tape, and therefore, the running state of the magnetic tape is stabilized regardless of the reproduction mode. According to the present invention, a good reproduced image without a noise bar can be obtained even in the fast-forward reproduction mode by the EP mode and the rewind mode by the EP mode. Also, a good reproduced image can be easily obtained even when applied to a VTR in which three recording traces each having a recording trace width of 1/3 of the conventional recording trace are simultaneously recorded and reproduced in parallel. Door can be.

[Brief description of drawings]

FIG. 1 is an overall side sectional view of a main part of a magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is an overall side sectional view of a main part of a magnetic recording / reproducing apparatus of the present invention.

FIG. 3 is an exploded perspective view of a part of the components of the magnetic recording / reproducing apparatus of the present invention.

FIG. 4 is a perspective view of a part of the components of the magnetic recording / reproducing apparatus of the present invention.

5 is a side sectional view for explaining the operation of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 1 and 2. FIG.

FIG. 6 is an overall perspective view of a main part of the magnetic recording / reproducing apparatus of the present invention.

FIG. 7 is a side cross-sectional view of part of the components of the magnetic recording / reproducing apparatus of the present invention.

FIG. 8 is an overall perspective view of a main part of the magnetic recording / reproducing apparatus of the present invention.

FIG. 9 is a side sectional view of a part of a component of the magnetic recording / reproducing apparatus of the present invention.

FIG. 10 is an overall side sectional view of a main part of a magnetic recording / reproducing apparatus of the present invention.

FIG. 11 is an overall side sectional view of a main part of the magnetic recording / reproducing apparatus of the present invention.

12 is a side sectional view for explaining the operation of the magnetic recording / reproducing apparatus of the present invention shown in FIG.

FIG. 13 is a side view of the vicinity of a drum for explaining a tape running system of a VTR.

FIG. 14 is a front view of a drum of a VTR.

FIG. 15 is an overall side sectional view of a main part of a proposed magnetic recording / reproducing apparatus used as a part of a component of the magnetic recording / reproducing apparatus of the present invention.

16 is a side sectional view for explaining the operation of the already proposed magnetic recording / reproducing apparatus used as a part of the components of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 15 and 17. FIG.

FIG. 17 is an overall side cross-sectional view of a main part of a proposed magnetic recording / reproducing apparatus used as a part of a component of the magnetic recording / reproducing apparatus of the present invention.

FIG. 18 is a side sectional view for explaining the operation of the already proposed magnetic recording / reproducing apparatus used as a part of the components of the magnetic recording / reproducing apparatus of the present invention shown in FIGS. 15 and 17;

FIG. 19 is a side view for explaining the position of the magnetic tape when the drum is tilted.

FIG. 20 is an explanatory diagram of a reproduction signal waveform when the drum is tilted.

FIG. 21 is a side view for explaining the position of the magnetic tape when the drum is tilted.

FIG. 22 is an explanatory diagram of a reproduction signal waveform when the drum is tilted.

FIG. 23 is a top view of the drum.

FIG. 24 is a diagram showing a tape pattern.

FIG. 25 is a diagram showing a tape pattern.

FIG. 26 is an overall side sectional view of a main part of the magnetic recording / reproducing apparatus of the present invention.

27 is a side sectional view for explaining the operation of the magnetic recording / reproducing apparatus of the present invention shown in FIG.

FIG. 28 is an overall perspective view of a main part of the magnetic recording / reproducing apparatus of the present invention.

FIG. 29 is an exploded perspective view of a part of the components of the magnetic recording / reproducing apparatus of the present invention.

FIG. 30 is a perspective view of the lower drum as viewed from the bottom side.

FIG. 31 is a perspective view of a guide portion for regulating the position of a magnetic tape as seen from the bottom surface side.

FIG. 32 is an overall side sectional view of an essential part of the magnetic recording / reproducing apparatus of the present invention.

33 is a side sectional view for explaining the operation of the magnetic recording / reproducing apparatus of the present invention shown in FIG. 32.

FIG. 34 is an exploded perspective view of a part of the components of the magnetic recording / reproducing apparatus of the present invention.

FIG. 35 is a perspective view of the lower drum as viewed from the bottom side.

FIG. 36 is a perspective view of the position regulating guide portion of the magnetic tape as viewed from the bottom side.

FIG. 37 is an overall side sectional view of a main part of the magnetic recording / reproducing apparatus of the present invention.

FIG. 38 is an exploded perspective view of a part of the components of the magnetic recording / reproducing apparatus of the present invention.

FIG. 39 is an exploded perspective view of a part of the components of the magnetic recording / reproducing apparatus of the present invention.

[Drawing reference number]

Dd ... Lower drum, Du ... Upper drum, SGR ... Supply side guide roller, TGR ... Tickup side guide roller, G, GA ... Magnetic tape position regulation guide portion, L ... Lead, SA ... Support member, Ha , Hb ... rotary magnetic head,
Md ... Drum motor, BP ... Base plate, DB ... Drum base, PS ... Support part, T ... Magnetic tape, CA, C
RA, CRAg ... annular cam member, Mg, Mg1, Mg2
... Motor with decelerator, FA, FA1, FA2 ... Arc-shaped operating member, Te ... Reference edge of magnetic tape, 1 ... Machine plate, 2,
3 ... Inclined poles, 4, 5 ... Sliding surface of magnetic tape, 6 ... Rotating shaft, 7 ... Upper drum fixing member, 10, 11 ... Bearing, 1
2, 13 ... Rotating transformer, 14, 15 ... Head holder,
20 ... Stator portion of drum motor Md, 21 ... Rotor portion of drum motor Md, 26 ... Upper end of support member SA, 26a ... Projection of upper end 26, 27 ... Fixed drum D
Inward projection edge portion of d, 28, 29 ... Rotation fulcrum, 30, 31,
34, 35, 86, 87 ... Spring, 33 ... Drum motor Md cover, 36, 37 ... Cam followers projecting from the support member SA, 38, 39 ... Support point plane portion, 42
... Leaf springs, 43 to 46 ... Positioning pins, 47, 48 ... Cam followers protruding from the base plate BP, 49,
50 ... a fulcrum protrusion projecting on the back surface side of the base plate BP, 57 ... a guide groove provided on the upper surface side of the base plate BP, 58-63, 109-120, 149-15
2 ... Cam contour, 64 ... Connection part, 65, 143, 146 ...
Arc gears, 79 to 81 ... Arc members, 82 ... Small diameter portion, 101 ... Output shaft, 102 ... Pinion, 103 ... Connecting pins, 105-108, FAf1, FAf2 ... Actuator, 1
29 ... Substrate of loading mechanism, 130, 138 ... Support component, 134 ... Shaft, 135 ... Variable guide pole S
Lower flanges 136, ... Upper flanges, 137 ... Rollers having a length corresponding to the width of the magnetic tape in GRv, TGRv, 140 ... Cylindrical portion, 201 ... Drum shaft, 20
2, 203, 206, 207, 231, 232 ... fulcrum pin with seat, 220 ... Leaf spring, 223, 224 ... Spring, 225 ... Motor, 226 ... Intermediate gear, 227, 22
8 ... Gear screw, 240, 241 ... Shaft, 24
2, 243, 250, 251 ... V groove, 264, 265 ...
Stepped shaft

Claims (11)

(57) [Claims] 1. A magnetic recording / reproducing apparatus in which a recording / reproducing operation is performed by using a rotary magnetic head on a magnetic tape wound around a part of a peripheral surface of a drum structure composed of an upper drum and a lower drum. The center axis of the rotating drum and the upper drum, which has the sliding contact surface of the magnetic tape, is adjusted so that the recording trace formed on the magnetic tape and the rotation locus surface of the rotating magnetic head are aligned. In the lower drum, there is provided first tilt drive means for inclining with respect to the central axis of the lower drum, which includes a magnetic tape position regulating guide portion for regulating the position of the reference edge of the tape and a sliding contact surface of the magnetic tape. A magnetic recording / reproducing apparatus comprising: a second taper drive means for tilting the lower drum so that the guide portion for controlling the position of the magnetic tape coincides with the position of the reference edge of the magnetic tape. 2. A first tilt drive means for rotatably supporting an upper drum and a rotary magnetic head with respect to a lower drum.
The second tilt drive means includes a second rotation fulcrum for rotatably supporting the lower drum with respect to the base of the apparatus, and the first rotation fulcrum is the lower fulcrum. It is arranged on a first straight line that is orthogonal to the center axis of the drum and that passes through a substantially central position of the winding range of the magnetic tape with respect to the peripheral surface of the drum structure, and the second rotation fulcrum is parallel to the first straight line. The magnetic recording / reproducing apparatus according to claim 1, wherein the magnetic recording / reproducing apparatus is arranged on the second straight line. 3. The second straight line is a straight line located on the exit side in the running path of the magnetic tape from the substantially central position of the winding range of the magnetic tape with respect to the peripheral surface of the drum structure. 2. Magnetic recording / reproducing device. 4. A magnetic recording / reproducing apparatus in which a recording / reproducing operation is performed by using a rotary magnetic head on a magnetic tape wound around a part of a peripheral surface of a drum structure including an upper drum and a lower drum. The upper drum having the sliding contact surface of the magnetic tape, the rotary magnetic head, the sliding contact surface of the magnetic tape located on the extension surface of the sliding contact surface of the magnetic tape on the upper drum, and the lower part of the sliding contact surface having a smaller diameter than the sliding contact surface. And a lower drum that is provided coaxially with the upper drum and a lower drum that is a separate structure from the upper and lower drums, and that is formed on the lower portion of the lower drum. The guide portion for controlling the position of the magnetic tape, which is arranged close to the surface, for controlling the position of the reference edge of the magnetic tape, the recording trace formed on the magnetic tape, and the rotation locus surface of the rotary magnetic head. So that they match A first inclination driving means for integrally inclining the lower drum and the rotary magnetic head, and a second inclination driving means for inclining the position regulating guide portion of the magnetic tape so as to coincide with a reference edge position of the magnetic tape. A magnetic recording / reproducing apparatus comprising: 5. The first tilt drive means comprises a first rotation fulcrum for rotatably supporting the lower drum with respect to the position regulating guide portion of the magnetic tape, and the second tilt drive means comprises , A second rotation fulcrum for rotatably supporting the position regulating guide portion of the magnetic tape with respect to the base portion of the device, the first rotation fulcrum being orthogonal to the central axis of the lower drum and The magnetic tape is arranged on the first straight line passing through the center of the winding range of the magnetic tape with respect to the circumferential surface of the structure, and the second rotation fulcrum is arranged on the second straight line parallel to the first straight line. The magnetic recording / reproducing apparatus according to claim 4, wherein 6. The magnetic recording / reproducing apparatus according to claim 5, wherein the first straight line and the second straight line are the same straight line. 7. The second straight line is a straight line located on the exit side of the running path of the magnetic tape from the substantially central position of the winding range of the magnetic tape with respect to the peripheral surface of the drum structure. 5. Magnetic recording / reproducing apparatus. 8. A tilt mode of a component part which is respectively tilted by a first tilt drive means and a second tilt drive means,
8. The magnetic recording / reproducing apparatus according to claim 1, wherein the magnetic recording / reproducing apparatus is changed according to the running speed of the magnetic tape. 9. A drive source and a second in the first tilt drive means.
9. The magnetic recording / reproducing apparatus according to claim 1, wherein the drive source in the drive means is separately provided. 10. The magnetic recording / reproducing apparatus according to claim 1, wherein the same drive source is used as the drive source in the first tilt drive means and the drive source in the second tilt drive means. . 11. The first tilt drive means comprises a first screw which contacts the lower drum and tilts the lower drum with respect to a position regulating guide portion of the magnetic tape, and the second tilt drive means comprises: 9. A second screw, which is in contact with a position regulation guide portion of the magnetic tape and inclines the position regulation guide portion of the magnetic tape with respect to the base of the apparatus. Any magnetic recording / reproducing device.