JP2000187907A - Magnetic tape recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the inclination adjustment of a capstan for adjusting the running behavior of a magnetic tape without affecting the characteristic of a capstan motor in a magnetic tape recording and reproducing device. SOLUTION: A DAT(digital audio tape recorder) has a mechanism 170 adjusting the inclination of a capstan in order to adjust the running behavior of the magnetic tape. A capstan inclination adjusting mechanism 170 is constituted of a T-shaped adjusting plate member 168 which is fixed to the flange part 164b of a capstan housing 164 separately from a stator plate 163 and first and second support fixing parts 171, 172 which support both ends of arm parts 168a of the adjusting plate member 168 and an adjusting screw mechanism part 173 adjusting the leg part 168b of the member 168. Then, the adjusting plate member 168 and the capstan housing 164 are displaced by properly rotating the screw 182 of the mechanism part 173 and the angle of a capstan 157 can be adjusted without bending the stator plate 163 even a little.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape recording / reproducing apparatus, and more particularly, to a DAT (Digital Audio Tape R) used as a large-capacity external storage device of a computer device.
ecorder) It relates to the streamer capstan tilt adjustment mechanism. The DAT streamer uses a DAT tape cassette, and records and reproduces information on and from a magnetic tape by a rotating drum (rotating head) that rotates at a high speed, and runs the magnetic tape by nipping and driving between a capstan and a pinch roller. Configuration. Recording information on magnetic tape
This is performed while reproducing the recorded location and confirming that the recording has been performed. Therefore, the capstan frequently repeats the counterclockwise rotation and the clockwise rotation, and the magnetic tape runs while frequently repeating the forward running and the reverse running.

[0002] In this DAT streamer, in order to stably record and reproduce information on a magnetic tape,
The traveling of the magnetic tape in the reverse direction is as stable as the traveling in the forward direction, that is, the traveling height of the magnetic tape in the reverse direction near the capstan is the traveling of the magnetic tape in the forward direction. It is necessary that the height is the same, in other words, the behavior of the magnetic tape during backward running is the same as the behavior of the magnetic tape during forward running.

[0003] Therefore, the DAT streamer is provided with a cap that adjusts the inclination of the capstan so that the behavior of the magnetic tape when traveling in the forward direction is the same as the behavior of the magnetic tape when traveling in the reverse direction. A stun tilt adjustment mechanism is provided.

[0004]

2. Description of the Related Art FIG. 9 shows a capstan tilt adjusting mechanism 70 previously devised by the present applicant and a DA incorporating the same.
5 shows a T streamer 50. Magnetic tape 52 is loaded from loading DAT tape cassette 51 to loading pole 5.
The pinch roller 56 is pulled out by the rollers 3 and 54 and wound around a rotating drum 55 having a rotating head, and is pressed against the capstan 57 in the direction indicated by the arrow N. When the capstan 57 is rotated counterclockwise by the capstan motor 58, the magnetic tape 52
7 are guided by poles 59a and 59b and run in the forward direction as indicated by the arrow F, and information is recorded on the magnetic tape 52 by the rotating head or the rotating head is recorded on the magnetic tape 52 at the positions on both sides of 7. Play information. The capstan motor 58 rotates in the reverse direction and the capstan 5
7 is rotated in the clockwise direction, the magnetic tape 52 moves to the arrow R
The vehicle is run in the reverse direction and slightly returned as shown by. Recording of information on the magnetic tape 52 is performed while reproducing the recorded location and confirming that the recording has been performed. Therefore, the capstan 57 frequently repeats the counterclockwise rotation and the clockwise rotation, and the magnetic tape 52 runs while frequently repeating the forward running and the reverse running.

FIGS. 10A, 10B, 11 and 12
As shown, the capstan motor 58 includes a stator coil 61, a rotor magnet 60, and a capstan 57 which is press-fitted into a center hole of the rotor magnet 60 and fixed and protrudes vertically. The stator coil 61 is adhered to the lower surface of the stator plate 63. On the lower surface of the stator plate 63, in addition to the stator coil 61,
A plurality of semiconductor components 66 and an MR element 67 constituting a circuit for controlling the rotation of the capstan motor 58 are mounted. The MR element 67 faces the peripheral surface of the rotor magnet 60 and detects the rotation speed of the rotor magnet 60. The capstan housing 64 has bearings 6 at the upper and lower ends.
4a is incorporated. The capstan 57 has its upper end and root portion rotatably supported by the capstan housing 64 by bearings 64a. The stator plate 63 is fixed to the lower surface of the capstan housing 64 by caulking. The rotor magnet 60 is located below the stator coil 61 with an air gap 65 therebetween. A stator plate 63 is attached to the upper surface of the chassis 62 as described later,
Are accommodated in the opening 62a of the chassis 62. The sub-chassis 66 is attached to the upper surface side of the chassis 62 and covers the stator plate 63.

The directions in which the inclination of the capstan 57 should be adjusted so that the behavior of the magnetic tape during backward running is the same as the behavior of the magnetic tape during forward running are indicated by arrows J1 and J2.
2. Arrows J1 and J2 are the same direction as the running direction of the magnetic tape 52 near the capstan 57. The DAT streamer 50 has a capstan tilt adjustment mechanism 70. As shown in FIGS. 10A, 10B, 11 and 12, the capstan tilt adjusting mechanism 70
First and second support fixing portions 71 and 72 for supporting and fixing the stator plate 63 are provided at two places, and an adjustment screw mechanism 73 for displacing the stator plate 63 in a direction perpendicular to the surface of the stator plate 63 is provided at one place. It is the structure provided in.

[0007] The first and second support fixing portions 71 and 72 are perpendicular to the directions indicated by the arrows J1 and J2 through the center of the capstan 57 in the plan views of FIGS. 9 and 10A. On K, it is arranged at symmetrical positions P1 and P2 on both sides with respect to the capstan 57. Note that the line K coincides with the direction indicated by the arrow N where the pinch roller 56 is pressed against the capstan 57. The adjusting screw mechanism 73 is located on a line M passing through the center of the capstan 57 and orthogonal to the above-mentioned line K and at a distance P3 away from the capstan 57 in the direction of arrow J2 by a distance L1. Holes 63a, 63 are formed in the stator plate 63 at positions corresponding to the positions P1, P2, P3.
3b and 63c are formed.

The first and second support fixing portions 71 and 72 have the same structure and are similar to a pivot. As shown in FIG. 11, reference numerals 74 and 75 denote support bases,
It is formed integrally with the chassis 62 so as to protrude further upward, and has a roof shape long in the direction of the line K. Countersunk screws 76, 77
Are screw holes 7 through holes 63a and 63b of stator plate 63.
4b, 75b and fastened to the stator plate 6
3 is a support surface 74 of the first and second support fixing portions 71 and 72
a, 75a and supported and fixed.

As shown in FIGS. 10B and 11, the adjusting screw mechanism 73 has a bolt 80 fixed vertically to the chassis 62, and a compression coil spring 8 around the bolt 80.
1 is fitted, the hole 63c of the stator plate 63 is fitted to the bolt 80, and the hole 6c of the lower surface of the stator plate 63 is
A portion around 3c is placed on the upper end of the compression coil spring 81, and a screw 82 is screwed into a bolt 80 protruding above the hole 63c.

When the screw 82 is turned in the tightening direction, the position P3 of the stator plate 63 sinks, and the capstan housing 64 is inclined.
It is inclined so as to be displaced in the direction indicated by 2. Conversely, when the screw 82 is turned in the loosening direction, the position P3 of the stator plate 63 rises by the spring force of the compression coil spring 81, the capstan housing 64 is inclined, and the capstan 57 is tilted.
Is inclined such that the tip is displaced in the direction indicated by arrow J1.

After assembling the DAT streamer 50, the magnetic tape 52 is pinched and driven by the pinch roller 56 and the capstan 57 to run in the forward and reverse directions.
An adjustment operation of appropriately tightening and loosening the screw 82 is performed so that the behavior of the magnetic tape when traveling in the forward direction is the same as the behavior of the magnetic tape when traveling in the reverse direction.

The degree of tightening of the screw 82 when adjusting the behavior of the magnetic tape when traveling in the forward direction and the behavior of the magnetic tape when traveling in the reverse direction by the assembled DAT streamer 50 is as follows. different.

[0013]

The stator plate 63 has a hole 6
3a and 63b are fixed to the support base 7 with flathead screws 76 and 77.
4, 75 are fixed. Therefore, when the screw 82 is turned in the tightening direction to sink the position P3 of the stator plate 63, the stator plate 63 bends in one direction, and the screw 82 is turned in the loosening direction to set the position P3 of the stator plate 63 to the compression coil. When the stator plate 63 is lifted by the spring force of the spring 81, the stator plate 63 bends in the opposite direction. When the stator plate 63 bends, the first
The stator coil 61 is bent and the stator coil 6
1 and the air gap 65 between the rotor magnet 60
And the air gap 65 becomes uneven in the circumferential direction. Therefore, as shown in FIG. E, when the screw 82 is strongly tightened, the difference between the maximum value and the minimum value of the rotation speed of the capstan motor 58 increases.

Second, as the distance between the MR element 67 and the peripheral surface of the rotor magnet 60 changes, as shown in FIG. F, when the screw 82 is strongly tightened, the FG pulse of the FG pulse extracted from the MR element 67 is increased. Fluctuations (capstan jitter), which are shifts in the time axis, increase. Therefore, the state of the screw 82 when adjusted so that the behavior of the magnetic tape when traveling in the forward direction and the behavior of the magnetic tape when traveling in the reverse direction are the same as the state of the DAT where the tightening is strong.
In the case of the streamer 50, the behavior of the magnetic tape when traveling in the forward direction is the same as the behavior of the magnetic tape when traveling in the reverse direction, but the maximum value and the minimum value of the rotation speed of the capstan motor 58 are reduced. The difference from the value exceeds the permissible value and the characteristic of the capstan motor 58 changes beyond the permissible value, or the fluctuation of the FG pulse (capstan jitter) exceeds the permissible value and is detected. In some cases, the characteristics may change beyond the allowable value, and the product may need to be readjusted.

Accordingly, an object of the present invention is to provide a magnetic tape recording / reproducing apparatus which has solved the above-mentioned problems.

[0016]

According to the first aspect of the present invention, the magnetic tape 152 is provided with a pinch roller 156 and a capstan 15.
7, and the capstan 157 is fixed to a rotor 160 of a capstan motor composed of stators 161 and 163 and a rotor 160. The upper and lower ends are rotatably supported by a capstan housing 164, and the stator 163 is fixed to the capstan housing 164.
Reference numeral 60 denotes a configuration fixed to the lower end of the capstan 157, and the chassis 1 of the magnetic tape recording / reproducing apparatus.
The capstan tilt is provided on the top 62 to adjust the inclination of the capstan so that the behavior of the magnetic tape when traveling in the forward direction is the same as the behavior of the magnetic tape when traveling in the reverse direction. In the magnetic tape recording / reproducing apparatus having the adjusting mechanism 170, the capstan tilt adjusting mechanism is fixed to the capstan housing 164, and includes an adjusting plate member 168 mounted on the chassis 162 and the adjusting plate member. An adjusting screw mechanism 173 for displacing a position different from the mounting position on the chassis in a direction perpendicular to the surface of the adjusting plate member. When the adjusting screw mechanism is operated, the adjusting plate member Are tilted with respect to the mounting location on the chassis, and the capstan housing 164 is
1, 163 and the rotor 160 are inclined so that the capstan 157 is inclined.

Since the inclination of the capstan is adjusted by adjusting the adjusting plate member provided separately from the stator, the stator is not bent when the inclination of the capstan is adjusted. That is, the adjustment of the inclination of the capstan can be performed without any bending of the stator. Therefore, the characteristics of the capstan motor do not deteriorate due to the adjustment of the inclination of the capstan. Therefore, in the case where the inclination of the capstan is adjusted so that the behavior of the magnetic tape when traveling in the forward direction is the same as the behavior of the magnetic tape when traveling in the reverse direction, in the assembled magnetic tape recording / reproducing apparatus. However, although the behavior of the magnetic tape is good, the characteristics of the capstan motor are deteriorated, and as a result, the characteristics are not satisfied.
A magnetic tape recording / reproducing apparatus which can be manufactured with high productivity including adjustment after assembly can be realized.

According to a second aspect of the present invention, in the first aspect, the adjusting plate member 168 is mounted on the support bases 174 and 175 which are formed on the chassis and form a roof, and are provided with holes 168d of the adjusting plate member. , 168e, and mounted on the chassis by flathead screws 176, 177 screwed into the support base. Since the support base is of a roof type and the screws are countersunk screws, the restraining force of the support plate at the mounting portion on the chassis with respect to the rotation of the support plate is reduced. Therefore, the rotational displacement of the adjusting plate member for adjusting the inclination of the capstan is smoothly performed without bending the adjusting plate member.

According to a third aspect of the present invention, in the first aspect, the adjusting plate member 168 is provided with respect to a line M passing through the center of the capstan housing and passing through the center of the capstan housing and the adjusting screw mechanism. The configuration is such that portions on both sides of the center of the capstan housing 164 on the orthogonal line K are mounted on the chassis.

The mounting position of the adjustment plate member on the chassis is on a line passing through the center of the capstan housing and orthogonal to a line passing through the center of the capstan housing and the adjustment screw mechanism, and Since the adjustment plate member is attached to the chassis on both sides with respect to the center of the cap, the pinch roller's pressing force on the capstan is firmly received, and the pinch roller's pressing force on the capstan causes the capstan to move. The tilt will not occur.

According to a fourth aspect of the present invention, in the first aspect, the adjusting plate member 168 and the capstan housing 164 are
A configuration in which the screw is fixed at a position on a line U which is at 45 degrees to a line M passing through the center of the capstan housing and the adjustment screw mechanism, and at both sides of the capstan housing. It is what it was. The place where the adjusting plate member is screwed to the capstan housing is a position on a line that forms an angle of 45 degrees with a line that passes through the center of the capstan housing and the adjusting screw mechanism, and is located on both sides of the capstan housing. First, since the position of the adjusting plate member when inclining the capstan is disengaged from the warped portion so as to swell, the force in the direction in which the screw comes off does not act strongly. Can be prevented from loosening. Second, the capstan housing can be fixed to the adjustment plate member both in the direction of adjusting the inclination of the capstan and in the direction in which the pinch roller presses the capstan against the capstan.

[0022]

FIG. 1 shows a DAT streamer 150 as a magnetic tape recording / reproducing apparatus according to an embodiment of the present invention.
And a capstan tilt adjusting mechanism 170 incorporated in the DAT streamer 150. DA attached
The magnetic tape 152 is pulled out from the T tape cassette 151 by the loading poles 153 and 154, wound around a rotating drum 155 having a rotating head, and a pinch roller 156 is moved from the direction indicated by an arrow N in the direction of the capstan 15.
7. When the capstan 157 is rotated counterclockwise by the capstan motor 158, the magnetic tape 152 is guided by the poles 159a and 159b at positions on both sides of the capstan 157, and travels in the forward direction as indicated by the arrow F. The information is recorded on the magnetic tape 152 by the rotating head, or the rotating head reproduces the information recorded on the magnetic tape 152. When the capstan motor 158 rotates in the reverse direction and the capstan 157 rotates clockwise, the magnetic tape 152 runs in the reverse direction as shown by the arrow R and is slightly returned. Recording of information on the magnetic tape 152 is performed while reproducing the recorded location and confirming that the recording has been performed. Therefore, the capstan 157 frequently repeats the counterclockwise rotation and the clockwise rotation, and the magnetic tape 152 runs while frequently repeating the forward running and the reverse running.

As shown in FIGS. 3 to 6, the capstan motor 158 is press-fitted into a stator coil 161, a rotor magnet 160, and a central hole of the rotor magnet 160, and is fixed and protrudes vertically. Capstan 157. The stator coil 161 is bonded to the lower surface of the stator plate 163. Stator plate 16
In addition to the stator coil 161, a plurality of semiconductor components 166 and an MR element 167 that constitute a circuit for controlling the rotation of the capstan motor 158 are mounted on the lower surface of 3. The MR element 167 faces the peripheral surface of the rotor magnet 160, and detects the rotation speed of the rotor magnet 160.

The capstan housing 164 has bearings 164a at the upper and lower ends. The capstan housing 164 has a flange portion 164b on the lower end side. The capstan 157 has its upper end portion and root portion connected to the capstan housing 16 by a bearing 164a.
4 rotatably supported. Screw holes 164d and 164e are formed on the upper surface of the flange portion 164b.

The stator plate 163 is provided on the lower surface of the flange portion 164b of the capstan housing 164 with reference numeral 164c.
It is caulked and fixed as shown by. The rotor magnet 160 is located below the stator coil 161 with an air gap 165 therebetween. Reference numeral 168 denotes an adjusting plate member, which will be described later.
Two screws 169 are provided on the upper surface of the 64 flange portions 164b.
a, 169b. This adjustment plate member 1
68 is attached to the upper surface side of the chassis 162 as described later, and the rotor magnet 160 is accommodated in the opening 162a of the chassis 162.

The sub-chassis 166 is attached to the upper surface side of the chassis 162, and covers the adjustment plate member 168 and the stator plate 163. The directions in which the inclination of the capstan 157 should be adjusted so that the behavior of the magnetic tape when traveling in the reverse direction is the same as the behavior of the magnetic tape when traveling in the forward direction are directions indicated by arrows J1 and J2. Arrows J1, J2
Is the same direction as the running direction of the magnetic tape 152 near the capstan 157.

The DAT streamer 150 has a capstan tilt adjusting mechanism 170. As shown in FIGS. 1 to 4, the capstan tilt adjusting mechanism 170
, 1st, 2nd support fixing parts 1 which support and fix 8
71 and 172 are provided at two places, and the adjusting plate member 168 is provided.
Adjustment screw mechanism 17 for displacing in the direction perpendicular to the surface of
3 is provided in one place.

The adjusting plate member 168 has a T-shape including an arm portion 168a and a leg portion 168b extending at a right angle to the arm portion 168a, and the leg portion 168b is connected to the arm portion 168a. A circular opening 168c is formed at the base, holes 168d and 168e are formed at both ends of the arm 168a, and a hole 168f is formed at the tip of the leg 168b. Further, screw holes 168g and 168h are formed at the base of the leg 168b to the arm 168a and around the circular opening 168c.

Q is the center line of the arm 168a, and S is the center line of the leg 168b. The circular opening 168c is formed at the intersection O1 between the center line Q and the center line S. Hole 1
68g and 168h are formed on a line U passing through the point O1 and forming an angle α (45 degrees) with respect to the line S and symmetrically with respect to the point O1. The adjusting plate member 168 has the screws 169a and 169b respectively having the holes 168g and 16g when the circular opening 168c is fitted in the capstan housing 164.
It is screwed into the screw holes 164d and 164e through 8h and tightened, and is fixed to the upper surface of the flange portion 164b.

First and second support fixing parts 171 and 172
1 is on a line K passing through the center of the capstan 157 and orthogonal to the directions indicated by the arrows J1 and J2 on the plan views of FIGS. 1 and 2 and symmetrical positions P11 and P12 on both sides with respect to the capstan 157. It is arranged in. Note that the line K coincides with the direction indicated by the arrow N in which the pinch roller 156 is pressed against the capstan 157. The adjusting screw mechanism 173 is disposed at a position P13 on a line M passing through the center of the capstan 157 and orthogonal to the above-described line K and separated from the capstan 157 by a distance L11 in the arrow J2 direction. Distance L
11 is as long as about 30 mm.

First and second support fixing parts 171 and 172
Are the same structure, similar to a pivot. FIG.
As shown in FIG. 4, reference numerals 174 and 175 denote support bases, which protrude above the chassis 162 and
2 and is a roof type long in the direction of the line K. The top support surfaces 174a and 175a have a narrow width W1 in a direction orthogonal to the line K of about 1 mm and a long and narrow shape in the direction of the line K. Vertical screw holes 174b and 175b are formed in each of the support bases 174 and 175.

As shown in FIGS. 3 and 4, the adjusting screw mechanism 173 has a bolt 180 fixed vertically to the chassis 162 and a compression coil spring 18 around the bolt 180.
1 is fitted, and the screw 182 is screwed to the bolt 180. Hole 168d, 1 of adjustment plate member 168
68e and 168f are the positions P11, P12 and P1 described above.
It is formed at the site corresponding to 3.

Capstan motor 158, stator plate 1
63, the capstan 157 and the capstan housing 164 are fixed at both ends of the arm 168a of the adjustment plate member 168 to the support bases 174 and 175, and the ends of the legs 168b of the adjustment plate member 168 are connected to the adjustment screw mechanism 173. The chassis 162 is supported and supported at three dispersed locations, and the line Q coincides with the line K and the line S coincides with the line M.
It is attached to the upper surface side of.

Looking at both end portions of the arm portion 168a, the flathead screws 76 and 77 are provided in the holes 168 of the adjustment plate member 168.
The screws 174b and 175b are screwed into the screw holes 174b and 175b through d and 168e and fastened, and are fixed on the support surfaces 174a and 175a of the support bases 174 and 175. Looking at the tip of the leg 168b, the hole 16
8f is fitted to the bolt 180, and a portion of the lower surface of the leg 168b around the hole 168f is
1, and a screw 182 is screwed into a bolt 180 projecting above the hole 168f.

When the screw 182 is turned in the tightening direction, the position P13 of the adjustment plate member 168 sinks, and the adjustment plate member 1
68 is slightly moved so as to rotate about the line Q,
The capstan motor 158, the stator plate 163, the capstan 157, and the capstan housing 164 are integrally inclined, and the capstan 157 is inclined such that the tip is displaced in the direction indicated by the arrow J2. Conversely, screw 18
2 is turned in the loosening direction, the position P13 of the adjustment plate member 168 rises due to the spring force of the compression coil spring 181.
The adjustment plate member 168 is minutely moved so as to rotate about the line Q, and the capstan motor 158 and the stator plate 1
63, the capstan 157 and the capstan housing 164 are integrally inclined, and the capstan 157 is inclined such that the tip is displaced in the direction indicated by the arrow J1. Since the distance L11 is as long as about 30 mm, the capstan 157
Is finely adjusted.

After assembling the DAT streamer 150,
The magnetic tape 152 is driven by being pinched by the pinch roller 156 and the capstan 157 so that the magnetic tape 152 is driven in the forward and reverse directions, and the screw 182 is adjusted and tightened or loosened as appropriate. And the behavior of the magnetic tape when traveling in the opposite direction is adjusted to be the same.

Here, the behavior of the stator plate 163 when turning the screw 182 in the tightening direction or the loosening direction to appropriately tilt the capstan 157 will be examined. The stator plate 163 is merely inclined integrally with the capstan housing 164 and does not bend at all. Therefore, first, the air gap 165 between the stator coil 161 and the rotor magnet 60 does not change, and the air gap 165 does not become uneven in the circumferential direction and is kept uniform. For this reason, as shown in FIG. 7, even when the screw 182 is strongly tightened, the difference between the maximum value and the minimum value of the rotation speed of the capstan motor 158 does not particularly increase, and the characteristics of the capstan motor 58 are within the allowable range. Is maintained.

Second, the distance between the MR element 67 and the peripheral surface of the rotor magnet 60 does not change. For this reason, as shown in FIG. 8, even when the screw 182 is strongly
The fluctuation (capstan jitter) of the FG pulse extracted from the element 67 does not particularly increase, and the detection characteristics are maintained within an allowable range. Therefore, although the behavior of the magnetic tape when traveling in the forward direction is adjusted to be the same as the behavior of the magnetic tape when traveling in the reverse direction, the characteristics of the capstan motor 58 and the detection characteristics of the MR element 67 are changed. It does not happen that the assembled DAT streamer 150 becomes an item that needs to be readjusted.

Next, other features of the above embodiment will be described. (1) As shown in FIGS. 2 and 4, the screwing point of the adjustment plate member 168 to the flange portion 164 b of the capstan housing 164 passes through the point O1 and the angle α (45 degrees) with respect to the line S. On the line U forming That is, the screwing position is shifted from the position on the line S.

When the operation of turning the screw 182 is performed as described above, the adjustment plate member 168 is curved in the longitudinal direction of the leg 168b. Therefore, when the screwing point of the leg portion 168b is set to a point on the line S, the screwing point is a place where the adjustment plate member 168 is to be deformed so as to expand, and when traveling in the forward direction. When the behavior of the magnetic tape is adjusted to be the same as the behavior of the magnetic tape when traveling in the opposite direction, the pull-out direction force acts on the screws 169a and 169b, and the screws 169a and 169b may be loosened. There is.

Further, if the screwing position is a position on the line Q, the above problem does not occur, but the degree of fixation of the capstan housing 164 to the adjusting plate member 168 in the direction of the line S becomes insufficient, and the capstan The adjustment of the angle 157 may be unstable. In this embodiment, as shown in FIGS. 2 and 4, the screwing point of the adjusting plate member 168 to the flange portion 164 b of the capstan housing 164 passes through the point O1 and the angle α (45) with respect to the line S.
), The degree of swelling of the adjustment plate member 168 when adjusted is small, and therefore, the screws 169a and 169b do not loosen. Further, a line S corresponding to the adjustment plate member 168 of the capstan housing 164 is formed.
The direction of the capstan 157 is also sufficiently fixed, and the capstan 157 is firmly fixed at the position where the angle is adjusted.
The adjustment of the angle of 57 is performed stably.

(2) As shown in FIGS. 3 and 4, the support surfaces 174a and 175a of the support bases 174 and 175
The width W1 in the direction perpendicular to the horizontal direction is as narrow as about 1 mm, and the portions where the heads 176a and 177a of the flat head screws 176 and 177 hold down the adjusting plate member 168 are formed at the edges 1 of the holes 168d and 163e.
68d1, 163e1 (hole 168
d, 163e are not pressed), the first and second support fixing portions 171 and 17 of the adjustment plate member 168.
The binding force at 2 is small. Therefore, the adjustment plate member 168
The clockwise and counterclockwise rotational displacements within a small angle range around the line K do not deflect the adjusting plate member 168, that is, smoothly generate no stress on the adjusting plate member 168. Done.

(3) The first support fixing portion 171 and the second support fixing portion 172 are arranged in the direction of the force N for pressing the capstan 157. Therefore, the second support fixing portion 17
2 support surface 175a and head 176a of countersunk screw 176
However, the force N by which the pinch roller 156 is pressed against the capstan 157 is most efficiently received. Therefore, the first,
The second support fixing portions 171 and 172 have rigidity so that the stator plate 63 does not move in a direction perpendicular to the surface of the stator plate 63.

The deviation of the direction in which the screws 169a and 169b are arranged from the direction of the force N is 45 degrees. Therefore,
The screws 169a and 169b well receive the force N for pressing the pinch roller 156 against the capstan 157. Therefore, the rigidity of the capstan 157 in the direction of the force N is high, and the capstan 157 does not tilt due to the pressure N by the pinch roller 156.

[0045]

As described above, the first aspect of the present invention is provided on the chassis of the magnetic tape recording / reproducing apparatus, and adjusts the inclination of the capstan to adjust the inclination of the magnetic tape when traveling in the forward direction. In a magnetic tape recording / reproducing apparatus having a capstan inclination adjusting mechanism for adjusting the behavior of a magnetic tape when traveling in a direction opposite to the behavior, the capstan inclination adjusting mechanism is provided separately from a stator. An adjustment plate member fixed to the housing and mounted on the chassis, and the adjustment plate member is moved to a position different from a mounting position on the chassis in a direction perpendicular to the surface of the adjustment plate member. When the adjusting screw mechanism is operated, the adjusting plate member, which is a member different from the stator, is mounted on the chassis. Is inclined respect, the capstan housing does not occur that the stator is deflected when adjusting the inclination of the structure and because the capstan of the capstan is tilted together with the stator and the rotor is tilted. That is, the adjustment of the inclination of the capstan can be performed without any bending of the stator. Therefore, the characteristics of the capstan motor do not deteriorate due to the adjustment of the inclination of the capstan. Therefore, in the case where the inclination of the capstan is adjusted so that the behavior of the magnetic tape when traveling in the forward direction is the same as the behavior of the magnetic tape when traveling in the reverse direction, in the assembled magnetic tape recording / reproducing apparatus. Although the behavior of the magnetic tape is good, the characteristics of the capstan motor deteriorate, and as a result, the characteristics will not be satisfied. A magnetic tape recording / reproducing apparatus that can be manufactured with high productivity can be realized.

According to a second aspect of the present invention, there is provided a plate wherein the adjusting plate member is formed on the chassis and is mounted on a roof-shaped support base, and is screwed into the support base through a hole of the adjustment plate member. Since the support base is a roof type and the screws are countersunk screws, the support plate is restrained against the rotation of the support plate at the mounting portion of the support plate on the chassis. The force is reduced.
Therefore, the rotational displacement of the adjusting plate member for adjusting the inclination of the capstan does not cause the adjusting plate member to bend much,
This makes it possible to adjust the inclination of the capstan smoothly without any special stress.

According to a third aspect of the present invention, the adjustment plate member is on a line passing through the center of the capstan housing and orthogonal to a line passing through the center of the capstan housing and the adjustment screw mechanism. With the configuration in which both sides of the center of the capstan housing are mounted on the chassis, the mounting portion of the adjustment plate member on the chassis firmly receives the pressing force of the pinch roller on the capstan, and The capstan can be prevented from tilting due to the pressing force of the roller against the capstan.

According to a fourth aspect of the present invention, the adjusting plate member and the capstan housing are located on a line at 45 degrees with respect to a line passing through the center of the capstan housing and the adjusting screw mechanism. , And at the positions on both sides of the capstan housing are screwed,
First, when the capstan is tilted, the adjustment plate member is disengaged from the warped portion so as to expand, so that the force in the direction in which the screw comes out does not act strongly, thus preventing the screw from being loosened. I can do it. Second, the capstan housing can be fixed to the adjustment plate member both in the direction of adjusting the inclination of the capstan and in the direction in which the pinch roller presses the capstan against the capstan.

[Brief description of the drawings]

FIG. 1 is a diagram showing an overall configuration of a DAT streamer according to one embodiment of the present invention.

FIG. 2 is a plan view of a capstan tilt adjusting mechanism in FIG. 1;

FIG. 3 is a side view of the capstan tilt adjusting mechanism in FIG. 1;

FIG. 4 is an exploded view of the capstan tilt adjusting mechanism of FIGS. 2 and 3;

FIG. 5 is an exploded view showing a capstan motor in FIG. 4;

FIG. 6 is a sectional view of a portion of the capstan motor in FIG. 4;

FIG. 7 is a diagram illustrating a change in characteristics of a capstan motor when a capstan tilt adjustment is performed.

FIG. 8 is a diagram showing a change in FG pulse fluctuation of a capstan motor when a capstan tilt adjustment is performed.

FIG. 9 is a diagram showing the overall configuration of a DAT streamer devised earlier by the present inventors.

FIG. 10 is a view showing a capstan inclination adjusting mechanism in FIG. 9;

FIG. 11 is an exploded view of the capstan tilt adjusting mechanism of FIG. 9;

FIG. 12 is a sectional view of a portion of a capstan motor in FIG. 11;

FIG. 13 is a diagram showing a change in characteristics of a capstan motor when a capstan tilt adjustment is performed.

FIG. 14 is a diagram showing a change in FG pulse fluctuation of a capstan motor when a capstan tilt adjustment is performed.

[Explanation of symbols]

 150 DAT streamer 152 Magnetic tape 155 Rotary drum 156 Pinch roller 157 Capstan 158 Capstan motor 163 Stator plate 168 Adjustment plate member 168a Arm 168b Leg 170 Capstan tilt adjustment mechanism 171 First support fixing part 172 Second support Fixing part 173 Adjustment screw mechanism part 174,175 Support base part 176,177 Countersunk screw 180 Bolt 181 Compression coil spring 182 Screw

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masahiro Harima 1601 Sakai, Atsugi-shi, Kanagawa F-term in Atsugi Works, Mitsumi Electric Co., Ltd. 5D071 AA08 BB02 BB09

Claims (4)

[Claims] 1. A structure in which a magnetic tape is nipped and driven by a pinch roller and a capstan to travel in a forward direction and a reverse direction, and the capstan is fixed to a rotor of a capstan motor including a stator and a rotor. The upper and lower ends are rotatably supported by a capstan housing, the stator is fixed to the capstan housing, and the rotor is fixed to the lower end of the capstan. Yes, and provided on the chassis of the magnetic tape recording and reproducing device, the behavior of the magnetic tape when traveling in the forward direction and the behavior of the magnetic tape when traveling in the reverse direction by adjusting the inclination of the capstan A magnetic tape recording / reproducing apparatus having a capstan inclination adjusting mechanism for adjusting the capstan so that The tilt adjustment mechanism is fixed to the capstan housing, and an adjustment plate member mounted on the chassis, and a position different from a place where the adjustment plate member is mounted on the chassis, the adjustment plate member And an adjusting screw mechanism for displacing the capstan housing in a direction perpendicular to a surface of the chassis. When the adjusting screw mechanism is operated, the adjusting plate member is inclined with respect to a mounting position on the chassis, and the capstan housing is fixed to the stator. A magnetic tape recording / reproducing apparatus characterized in that the capstan is tilted together with the rotor to tilt the capstan. 2. The chassis according to claim 2, wherein said adjusting plate member is formed on said chassis, and is mounted on a roof-shaped support base, and said chassis is screwed into said support base through a hole of said adjustment plate member. 2. The magnetic tape recording / reproducing apparatus according to claim 1, wherein the magnetic tape recording / reproducing apparatus is mounted on the magnetic tape. 3. The capstan housing, wherein the adjustment plate member is on a line passing through the center of the capstan housing and orthogonal to a line passing through the center of the capstan housing and the adjustment screw mechanism. 2. The magnetic tape recording / reproducing apparatus according to claim 1, wherein both sides of the center of the magnetic tape are mounted on the chassis. 4. The adjustment plate member and the capstan housing are positioned on a line at 45 degrees to a line passing through the center of the capstan housing and the adjustment screw mechanism, and 2. The magnetic tape recording / reproducing apparatus according to claim 1, wherein screws are fixed at positions on both sides of the stun housing.