JP2004030773A - Rotating head device and magnetic tape device - Google Patents

Abstract

An object of the present invention is to prevent the deformation of an outer ring of a bearing and improve the rotation accuracy of a rotary drum.
The rotary drum is attached to a support shaft and is driven to rotate integrally with the support shaft, and a rotating drum to which magnetic heads are attached, and a pair of bearings rotatably supporting the support shaft. , 26b is provided with a fixed drum 22 provided with a housing portion 34. The housing portion 34 is formed over the entire circumference on a sleeve portion 35b into which the bearing 26b is press-fitted, and on an inner peripheral surface of the sleeve portion 35b. The annular groove 38, a flow path 39 for injecting an adhesive into the annular groove 38, and a depth facing the annular groove 38, are formed between the sleeve portion 35b and the outer ring 28b of the bearing 26b. And a hole 40 that forms a gap S to such an extent that the adhesive injected into the annular groove 38 does not protrude. When the bearing 26b is fixed to the housing portion 34 by the adhesive injected into the annular groove 38, the bearing 26b Uneven pressure on the outer ring 28b is prevented according to the.
[Selection diagram] FIG.

Description

[0001]
The present invention relates to a rotary head device that records and / or reproduces signals on a recording medium such as a magnetic tape by a helical scan method, and a magnetic tape device including such a rotary head device.
[0002]
[Prior art]
For example, a magnetic tape device such as a video tape recorder (VTR) that records and reproduces signals on a magnetic tape by a helical scan method is provided with a rotary head device 100 as shown in FIG.
[0003]
The rotary head device 100 includes a set of a rotating drum 101 and a fixed drum 102 combined in a vertical direction, and a drive motor 103. The rotating drum 101 forming an upper drum is replaced with a fixed drum 102 forming a lower drum. Is rotationally driven by a drive motor 103 arranged below the. The rotating drum 101 has a central portion attached to a support shaft 104 and is driven to rotate integrally with the support shaft 104 by a drive motor 103. Also, a plurality of magnetic heads 105 whose front ends face the outer peripheral surface are attached to the rotating drum 101. A rotary transformer 106 for transmitting and receiving signals to and from the magnetic head 105 is provided between the rotary drum 101 and the fixed drum 102.
[0004]
The fixed drum 102 forms an outer peripheral surface that is continuous with the outer peripheral surface of the rotating drum 101, and a step called a lead for guiding a magnetic tape is formed on the outer peripheral surface. At the center of the fixed drum 102, a sleeve-shaped housing portion 108 for holding a pair of bearings 107a and 107b for rotatably supporting the support shaft 104 is provided. Of the pair of bearings 107a and 107b, the bearing 107a on the rotating drum 101 side is fixed by an adhesive (not shown) after being fitted into the housing portion 108 with a gap. On the other hand, the bearing 107b on the fixed drum 102 side is lightly press-fitted into the housing portion 108 and then fixed with an adhesive (not shown). For this reason, annular grooves 109a and 109b into which an adhesive is injected are formed on the surfaces of the housing portion 108 that are in contact with the outer rings of the bearings 107a and 107b. In addition, an injection hole 110 facing the annular groove 109a is formed in the housing portion 108 as a flow path for injecting an adhesive into the annular grooves 109a and 109b. On the other hand, a pair of groove portions 111 facing the annular groove 109 is formed on the surface of the housing portion 108 that comes into contact with the outer ring of the bearing 107b along the axial direction of the support shaft 104.
[0005]
In the rotary head device 100 configured as described above, while the magnetic tape hung on the outer peripheral surfaces of the rotary drum 101 and the fixed drum 102 travels obliquely along the leads, the rotary motor 101 Is driven to rotate in the same direction as the traveling direction. Then, while the plurality of magnetic heads 105 mounted on the rotating drum 101 slide on the magnetic tape, a signal recording or reproducing operation is performed on the magnetic tape. Specifically, at the time of recording, one of the plurality of magnetic heads 105 forms a recording track with a predetermined track width while applying a magnetic field corresponding to a recording signal, while the other recording head performs the recording. A recording track is formed with a predetermined track width while applying a magnetic field according to a recording signal adjacent to the track. Then, these recording heads repeatedly form recording tracks on the magnetic tape, thereby continuously recording signals on the magnetic tape. On the other hand, during reproduction, one of the plurality of magnetic heads 105 detects a signal magnetic field from a recording track recorded by one recording head, while another reproduction head is recorded by another recording head. A signal magnetic field is detected from a recording track. Then, these read heads repeatedly detect the signal magnetic field from the recording track, thereby continuously reproducing the signal recorded on the magnetic tape.
[0006]
[Problems to be solved by the invention]
By the way, the track pitch of the recording tracks recorded on the magnetic tape tends to be further narrowed due to the recent increase in recording density, and accordingly, the improvement of the rotation accuracy of the rotating drum 101 and the downsizing of the rotating head device 100 are required. ing.
[0007]
However, in the conventional rotary head device 100 having the above-described structure, as shown in FIG. 8, when the bearing 107b is pressed into the housing portion 108, the outer ring of the bearing 107b is deformed by receiving uneven pressure. As a result, there is a problem that the rotational accuracy of the bearing 107b is deteriorated.
[0008]
In this case, a swing occurs in the rotation of the support shaft 104, and the plurality of magnetic heads 105 mounted on the rotating drum 101 fluctuate in a vertical direction at a cycle that does not coincide with the rotating cycle of the rotating drum 101. As a result, the pitch width of the recording track recorded on the magnetic tape by the pair of recording heads fluctuates, resulting in image quality deterioration due to insufficient output during reproduction or reducing the margin of image quality deterioration. Such a problem is not so serious in the conventional VTR format having a relatively large track pitch, but becomes very significant when the track pitch is set to, for example, 10 μm or less.
[0009]
As a countermeasure method, conventionally, the thickness of the outer ring of the bearing 107b is increased so that the outer ring of the bearing 107b does not deform even when subjected to uneven pressure. However, when the thickness of the outer ring of the bearing 107b is increased, the housing portion 108 holding the bearing 107b also needs to be increased, which makes it very difficult to reduce the size of the rotary head device 100 described above.
[0010]
Further, unlike the rotary head device 200 shown in FIG. 9, a part of the end surfaces of the bearings 107a and 107b press-fitted into the housing portion 108 is removed from the housing portion 108 without providing the annular grooves 109a and 109b for injecting the adhesive. In the case where the adhesive 201 is applied by projecting, the outer rings of the bearings 107a and 107b can be prevented from being deformed, but the workability in applying the adhesive 201 is poor and the bonding reliability is low. Would. In addition, the interval between the pair of upper and lower bearings 107a and 107b must be shortened, causing problems such as deterioration of the rotation accuracy of the rotary drum 101.
[0011]
Therefore, the present invention has been proposed in view of such conventional circumstances, and provides a rotary head device which prevents deformation of an outer ring of a bearing and improves rotation accuracy of a rotary drum. The purpose is to:
[0012]
In addition, the present invention provides such a rotary head device to perform an appropriate signal recording and / or reproducing operation on a magnetic tape even when a track pitch is narrowed in response to an increase in recording density. It is an object of the present invention to provide a magnetic tape device that enables the above.
[0013]
[Means for Solving the Problems]
In order to achieve this object, the rotary head device according to the present invention has a center portion attached to a spindle and driven to rotate integrally with the spindle, and a magnetic head whose tip portion faces from the outer peripheral surface is attached. A housing, comprising: a rotating drum; and a fixed drum that forms an outer peripheral surface that is continuous with the outer peripheral surface of the rotating drum and that has a housing portion provided with a pair of bearings that rotatably support a support shaft at a center portion. The portion is a sleeve portion into which at least the fixed drum-side bearing of the pair of bearings is press-fitted, an annular groove formed on the inner peripheral surface of the sleeve portion over the entire circumference, and an adhesive is injected into the annular groove. And a hole formed at a depth facing the annular groove and forming a gap between the sleeve portion and the outer ring of the bearing such that the adhesive injected into the annular groove does not protrude. Features.
[0014]
As described above, in the rotary head device according to the present invention, the hole formed at the depth facing the annular groove is such that the adhesive injected into the annular groove between the sleeve portion and the outer ring of the bearing does not protrude. When the bearing is fixed to the housing by the adhesive injected into the annular groove, uneven pressure can be prevented from being applied to the outer ring of the bearing. As a result, deformation of the outer ring of the bearing can be prevented, and rotation accuracy of the rotating drum can be improved.
[0015]
Further, the magnetic tape device according to the present invention comprises a tape running means for running the magnetic tape, and recording and / or reproducing of signals while sliding the leading end of the magnetic head with respect to the magnetic tape run by the tape running means. The recording / reproducing means includes a rotating drum having a central portion attached to a support shaft, which is driven to rotate integrally with the support shaft, and a magnetic head having a front end portion facing the outer peripheral surface. A fixed drum that forms an outer peripheral surface that is continuous with the outer peripheral surface of the rotating drum, and that has a housing portion provided with a pair of bearings that rotatably support a support shaft at a central portion thereof, A sleeve portion into which at least the fixed drum-side bearing of the pair of bearings is press-fitted, an annular groove formed over the entire inner peripheral surface of the sleeve portion, and an adhesive for injecting an adhesive into the annular groove. It is characterized by having a flow path and a hole formed at a depth facing the annular groove and forming a gap between the sleeve portion and the outer ring of the bearing such that the adhesive injected into the annular groove does not protrude. And
[0016]
As described above, in the magnetic tape device according to the present invention, the hole formed at a depth facing the annular groove is such that the adhesive injected into the annular groove between the sleeve portion and the outer ring of the bearing does not protrude. When the outer ring of the bearing is fixed to the sleeve of the housing by the adhesive injected into the annular groove, uneven pressure is prevented from being applied to the outer ring of the bearing. As a result, deformation of the outer ring of the bearing can be prevented, and the rotation accuracy of the rotary drum can be improved. Therefore, a proper recording and / or reproducing operation by the magnetic head on the magnetic tape run by the tape running means can be performed. It can be performed.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a rotary head device and a magnetic tape device to which the present invention is applied will be described in detail with reference to the drawings.
[0018]
As shown in FIG. 1, a magnetic tape device 1 to which the present invention is applied records and reproduces signals on and from a magnetic tape 2 by a helical scan method. The magnetic tape device 1 includes, as tape running means, a supply reel 3 for supplying a magnetic tape 2, a take-up reel 4 for winding the magnetic tape supplied from the supply reel 3, a supply reel 3 and a take-up reel 4. And a plurality of guide rollers 5a to 5f for routing the magnetic tape 2 therebetween, so that the magnetic tape 2 can run in the direction of arrow A in FIG.
[0019]
In addition, the magnetic tape device 1 includes a pinch roller 5g on which the magnetic tape 2 is hung, and a cap stun 6 that sandwiches the magnetic tape 2 together with the pinch roller 5g, between the guide roller 5e and the guide roller 5f. . The cap stun 6 is for always running the magnetic tape 2 at a constant speed, and is rotationally driven by a cap stun motor 6a during tape running. Therefore, the magnetic tape 2 is sent out at a constant speed in the direction of arrow A in FIG. 1 by the capstan 6 being rotationally driven in the direction of arrow B in FIG. 1 by the capstan motor 6a.
[0020]
In addition, the magnetic tape device 1 includes a rotary head device 20 to which the present invention is applied, as a recording / reproducing unit that records or reproduces a signal on / from the magnetic tape 2 between the rollers 5c and 5d.
[0021]
As shown in FIGS. 2 and 3, the rotary head device 20 includes a set of a rotary drum 21 and a fixed drum 22 combined in a vertical direction, and a drive motor 23, and forms a rotary drum 21 forming an upper drum. Is driven to rotate in a direction indicated by an arrow C in FIG. 2 by a drive motor 23 disposed below a fixed drum 22 constituting a lower drum. The rotating drum 21 and the fixed drum 22 form continuous outer peripheral surfaces 21a, 22a, and the magnetic tape 2 is attached to the outer peripheral surfaces 21a, 22a of the rotating drum 21 and the fixed drum 22 by approximately 180 °. Helically multiplied over the angle range. A step 22b called a lead for guiding the magnetic tape 2 is formed on the outer peripheral surface 22a of the fixed drum 22, and the magnetic tape 2 runs along the lead.
[0022]
The rotating drum 21 is formed of a metal material such as an aluminum alloy into a substantially cylindrical shape, and has a hub 25 attached to a support shaft 24 at the center thereof. The rotary drum 21 is attached to the support shaft 24 by screwing one end of the support shaft 24 into the center hole 25 a of the hub 25 after press-fitting. The support shaft 24 is rotatably supported by a pair of bearings 26a and 26b. The pair of bearings 26a, 26b have a structure in which balls 27a, 27b are fitted into grooves 24a, 24b formed around the axis of the support shaft 24, and the balls 27a, 27b are held by outer rings 28a, 28b. I have. A coil spring 29 is provided between the pair of bearings 26a and 26b. The coil spring 29 biases the pair of bearings 26a and 26b in a direction in which the pair of bearings 26a and 26b are separated from each other while the support shaft 24 is inserted. are doing. Therefore, the pair of bearings 26a and 26b improve the rotation accuracy by a structure integrated with the support shaft 24 having no inner ring, and eliminate the gap between the support shaft 24 and the outer rings 28a and 28b by the urging of the coil spring 29 to rotate the pair of bearings 26a and 26b. This prevents rattling at the time.
[0023]
A substantially disk-shaped balance ring 30 is attached to the upper surface of the rotary drum 21 with a double-sided adhesive tape or the like fitted in the hub portion 25. A plurality of holes having different diameters are formed in the balance ring 30, and the rotation balance of the rotary drum 21 can be adjusted by press-fitting steel balls into these holes.
[0024]
A pair of recording magnetic heads (hereinafter, referred to as recording heads) 31a and 31b for performing a signal recording operation on the magnetic tape 2 and a signal reproducing operation for the magnetic tape 2 are provided on the rotating drum 21. And a pair of reproducing magnetic heads (hereinafter, referred to as reproducing heads) 32a and 32b are screwed in such a manner that the front end faces from the outer peripheral surface 21a of the rotating drum 21 and the outer peripheral surface 22a of the fixed drum 22. It is attached by a stop. Further, the recording head 31a and the reproducing head 32a and the recording head 31b and the reproducing head 32b are disposed on the outer peripheral surface 21a of the rotating drum 21 so as to face each other with a phase difference of 180 °. The recording heads 31a and 31b and the reproducing heads 32a and 32b are arranged so that the recording gap and the reproducing gap are oblique to the direction substantially perpendicular to the running direction of the magnetic tape 2 according to the azimuth angle. I have.
[0025]
A rotary transformer 33 for transmitting and receiving signals to and from the recording heads 31a and 31b and the reproducing heads 32a and 32b is provided between the rotary drum 21 and the fixed drum 22. The rotary transformer 33 has a rotor transformer 33a attached to the rotary drum 21 by bonding and a stator transformer 33b attached to the fixed drum 22 by bonding. 33b are arranged opposite to each other.
[0026]
The fixed drum 22 is formed of a metal material such as an aluminum alloy into a substantially cylindrical shape, and a center portion thereof is provided with a housing portion 34 that holds the pair of bearings 26a and 26b described above. The housing portion 34 has an upper sleeve portion 35a to which the bearing 26a on the rotating drum 21 is fixed, and a lower sleeve portion 35b to which the bearing 26b on the fixed drum 22 is fixed.
[0027]
After the bearing 26a on the rotating drum 21 side is fitted to the upper sleeve portion 35a (with a gap of several μm), the bearing 26a is bonded by using an adhesive (not shown) called a medium viscosity having a viscosity of around 100 cps. Fixed. For this reason, an upper annular groove 36 into which an adhesive is injected is formed on the entire inner peripheral surface of the upper sleeve portion 35a. Further, as a flow path for injecting the adhesive into the upper annular groove 36, an injection hole 37 facing the annular groove 36 from the outer peripheral surface is formed in the upper sleeve portion 35a.
[0028]
On the other hand, as shown in FIGS. 4 and 5, after the bearing 26b on the fixed drum 22 side is lightly press-fitted (tightly fitted to several μm) into the lower sleeve portion 35b, an adhesive called a medium viscosity of about 100 cps is applied. It is fixed by bonding using an agent (not shown). For this reason, a lower annular groove 38 into which an adhesive is injected is formed on the entire inner peripheral surface of the lower sleeve portion 35b. The lower annular groove 38 preferably has a depth at which the adhesive flows smoothly in accordance with the viscosity of the injected adhesive. In this case, an adhesive having a viscosity of about 110 cps is used. The height was about 0.1 mm. The width of the lower annular groove 38 may be determined by the adhesive strength between the lower sleeve portion 35b and the outer ring 28b of the bearing 26b. In addition, a pair of injection grooves 39 are formed on the inner peripheral surface of the lower sleeve portion 35b along the axial direction of the support shaft 24 from positions opposing each other as a flow path for injecting the adhesive into the lower annular groove 38. Is formed. The pair of injection grooves 39 can secure the strength of the lower sleeve portion 35b as compared with the case where an injection hole facing the lower annular groove 38 is formed from the outer peripheral surface of the lower sleeve portion 35b. Can be shortened. When the adhesive is injected into the lower annular groove 38, the adhesive is injected from the other injection groove 39 while performing suction from one injection groove 39. Thus, the adhesive can be smoothly and easily injected over the entire circumference of the lower annular groove 38.
[0029]
By the way, when fixing the pair of bearings 26a, 26b to the housing portion 34, by pressing one of the bearings 26b, the accuracy of the bearing in the vertical direction with respect to the drum can be improved. However, when the bearing 107b is press-fitted into the housing portion 108 as in the conventional rotary head device 100 shown in FIG. 8 described above, the outer ring of the bearing 107b is deformed by receiving uneven pressure, and the bearing 107b is deformed. There was a problem that the rotation accuracy of 107b deteriorated.
[0030]
Therefore, in order to prevent deformation of the outer ring 28b of the bearing 26b, light press-fitting is performed with a press-in allowance of about several μm, and the lower sleeve 35b is provided on the surface of the lower sleeve 35b which is in contact with the outer ring 28b of the bearing 26b. A hole 40 is formed between the bearing 26b and the outer ring 28b so as to form a gap S that does not allow the adhesive injected into the lower annular groove 38 to protrude. As shown in FIG. 6, the hole 40 is formed to have a depth facing the lower annular groove 38 from the lower surface of the lower sleeve portion 35b, and the lower sleeve portion 35b and the outer ring 28b of the bearing 26b are formed by the hole 40. A gap S of about 10 μm to 20 μm is formed between them. Thereby, when the bearing 26b is fixed to the lower sleeve portion 35b by the adhesive injected into the lower annular groove 38, it is possible to prevent uneven pressure from being applied to the outer ring 28b of the bearing 26b.
[0031]
In order to ensure the accuracy of the bearing 26b in the vertical direction with respect to the fixed drum 22, the surface of the lower sleeve 35b into which the bearing 26b is press-fitted into the outer ring 28b of the bearing 26b is reduced by 1/2 to 2/3. It is preferable to secure the degree.
[0032]
As shown in FIGS. 3 and 4, the drive motor 23 is attached to the other end of the support shaft 24 that penetrates the fixed drum 22, and is driven to rotate integrally with the support shaft 24, and the main motor facing the fixed drum 22. A rotor 42 having a magnet 41 attached to its surface, a magnet 41 of the rotor 42 facing the magnet 41 at a predetermined interval, a yoke 43 attached to the rotor 42, and a rotor 42 between the yoke 43 and the rotor 42. A stator 44 is attached to the fixed drum 22 and has a coil (not shown) attached to a main surface facing the magnet 41.
[0033]
The rotor 42 is formed by forming a soft magnetic material into a substantially disk shape, and a boss portion 45 attached to the support shaft 24 is provided at the center thereof. The rotor 42 is attached to the support shaft 24 by press-fitting the other end of the support shaft 24 that penetrates the fixed drum 22 into a center hole 45 a of the boss 45. A substantially disk-shaped balance ring 46 is attached to the lower surface of the rotor 42 by a double-sided adhesive tape or the like while being fitted to the hub portion 45. A plurality of holes having different diameters are formed in the balance ring 46, and the rotational balance of the drive motor 23 can be adjusted by press-fitting steel balls into these holes. The back yoke 43 is formed by molding a soft magnetic material into a substantially disk shape, and has a shape in which the center portion protrudes in a substantially cylindrical shape. The back yoke 43 forms a magnetic path together with the rotor 42 by attaching the center of the back yoke 43 to the rotor 42 by bonding. The stator 44 is formed in a substantially disk shape, and its outer peripheral portion is attached to the lower end of the fixed drum 22 by bonding.
[0034]
Therefore, when a drive current is supplied to the coil of the stator 44, a magnetic field is generated in the coil, and the rotor 42 is driven to rotate integrally with the support shaft 24 by a magnetic action between the coil and the magnet 41 facing the coil. Thereby, the drive motor 23 can drive the rotary drum 21 to rotate integrally with the support shaft 24.
[0035]
In the magnetic tape device 1 configured as described above, the magnetic tape 2 hung on the outer peripheral surfaces 21a, 22a of the rotating drum 21 and the fixed drum 22 is rotated by the drive motor 23 while traveling in the direction of arrow A in FIG. When the drum 21 is driven to rotate in the direction of arrow C in FIG. 1, the pair of recording heads 31 a and 31 b and the pair of reproducing heads 32 a and 32 b mounted on the rotating drum 21 slide on the magnetic tape 2 while sliding. A signal recording operation or a reproduction operation is performed.
[0036]
Specifically, at the time of recording, one recording head 31a forms a recording track with a predetermined track width while applying a magnetic field corresponding to a recording signal to the magnetic tape 2, and the other recording head 31b A recording track is formed with a predetermined track width while applying a magnetic field according to a recording signal adjacent to the recording track. Then, the recording heads 31 a and 31 b form recording tracks repeatedly on the magnetic tape 2, thereby continuously recording signals on the magnetic tape 2.
[0037]
On the other hand, at the time of reproduction, one reproduction head 32a detects a signal magnetic field from a recording track recorded by one recording head 31a with respect to the magnetic tape 2, and the other reproduction head 32b is controlled by the other recording head 31b. A signal magnetic field is detected from the recorded recording track. Then, the reproducing heads 32a and 32b continuously reproduce the signal recorded on the magnetic tape 2 by repeatedly detecting the signal magnetic field from the recording track.
[0038]
As described above, in the rotary head 20 to which the present invention is applied, the hole 40 is formed at a depth facing the lower annular groove 38 from the lower surface of the lower sleeve 35b, and the lower sleeve 35b is formed by the hole 40. Since a gap S is formed between the outer ring 28b of the bearing 26b and the outer ring 28b so that the adhesive does not protrude, the lower sleeve 26 is formed by the adhesive injected from the pair of injection grooves 39 into the lower annular groove 38. When fixed to the portion 35b, it is possible to prevent uneven pressure from being applied to the outer race 28b of the bearing 26b.
[0039]
Accordingly, it is possible to prevent deformation of the outer ring 28b of the bearing 26b on the fixed drum 22 side, and it is possible to improve the rotational accuracy of the rotary drum 21 that is driven to rotate integrally with the support shaft 24. An appropriate signal recording or reproducing operation can be performed on the magnetic tape 2 without causing a vertical step change in the pair of recording heads 31a, 31b and reproducing heads 32a, 32b mounted on the rotating drum 21. It is possible.
[0040]
Therefore, in the magnetic tape device 1 including such a rotary head device 20, even when the track pitch of the recording track recorded on the magnetic tape 2 is reduced in response to the increase in recording density, the image quality is not deteriorated. In addition, it is possible to increase the margin of image quality deterioration, and it is possible to further reduce the size of the rotary head device 20.
[0041]
【The invention's effect】
As described in detail above, according to the present invention, the hole formed at the depth facing the annular groove is such that the adhesive injected into the annular groove does not protrude between the sleeve portion and the outer ring of the bearing. , It is possible to prevent uneven pressure from being applied to the outer ring of the bearing when the outer ring of the bearing is fixed to the sleeve of the housing by the adhesive injected into the annular groove. is there. As a result, it is possible to prevent deformation of the outer ring of the bearing and improve the rotational accuracy of the rotating drum. Therefore, when the track pitch of the recording tracks recorded on the magnetic tape is narrowed in response to high recording density. However, it is possible to perform an appropriate recording and / or reproducing operation on the magnetic tape by the magnetic head, and it is possible to increase a margin of image quality deterioration. Further, it is possible to reduce the size of the rotary head device.
[Brief description of the drawings]
FIG. 1 is a plan view showing a magnetic tape device to which the present invention is applied.
FIG. 2 is a perspective view showing a rotary head device to which the present invention is applied.
FIG. 3 is a sectional view showing the rotary head device.
FIG. 4 is a sectional view showing a main part of the rotary head device.
FIG. 5 is a plan view of the rotary head device as viewed from a fixed drum side.
FIG. 6 is an enlarged perspective view showing a portion surrounded by an arrow D in FIG. 5;
FIG. 7 is a sectional view showing an example of a conventional rotary head device.
FIG. 8 is a sectional view showing a main part of the conventional rotary head device.
FIG. 9 is a sectional view showing a modification of the conventional rotary head device.
[Explanation of symbols]
Reference Signs List 1 magnetic tape device, 2 magnetic tape, 3 supply reel, 4 take-up reel, 5a to 5f guide roller, 5g pinch roller, 6 capstan, 20 rotating head device, 21 rotating head, 22 fixed head, 23 driving motor, 24 Support shaft, 26, 26b A pair of bearings, 28a, 28b Outer ring, 29 coil spring, 30 balance ring, 31a, 31b recording head, 32a, 32b reproducing head, 33 rotary transformer, 34 housing part, 35a upper sleeve part, 35b lower sleeve Part, 36 upper annular groove, 37 injection hole, 38 lower annular groove, 39 pair of injection grooves, 40 holes, 41 magnet, 42 rotor, 43 yoke, 44 stator, 46 balance ring

Claims (2)

A rotating drum to which a magnetic head whose center is attached to the support shaft and driven to rotate integrally with the support shaft and whose front end faces from the outer peripheral surface is attached,
A fixed drum provided with a housing portion in which a pair of bearings for rotatably supporting the support shaft are held at a center portion while forming an outer peripheral surface continuous with the outer peripheral surface of the rotary drum,
The housing portion includes a sleeve portion into which at least the bearing on the fixed drum side of the pair of bearings is press-fitted, an annular groove formed over the entire inner peripheral surface of the sleeve portion, and an annular groove. A flow path for injecting an adhesive, formed at a depth facing the annular groove, such that the adhesive injected into the annular groove does not protrude between the sleeve portion and the outer ring of the bearing. A rotary head device having a hole forming a gap. Tape running means for running a magnetic tape,
Recording / reproducing means for recording and / or reproducing signals while sliding the tip of the magnetic head with respect to the magnetic tape run by the tape running means,
The recording / reproducing means includes a rotating drum having a central portion attached to a spindle and being driven to rotate integrally with the spindle, and having the magnetic head attached to a tip end face from an outer peripheral surface, an outer periphery of the rotating drum. A fixed drum provided with a housing portion in which a pair of bearings rotatably supporting the support shaft are held at a central portion, while forming an outer peripheral surface continuous with the surface,
The housing portion includes a sleeve portion into which at least the bearing on the fixed drum side of the pair of bearings is press-fitted, an annular groove formed over the entire inner peripheral surface of the sleeve portion, and an annular groove. A flow path for injecting an adhesive, formed at a depth facing the annular groove, such that the adhesive injected into the annular groove does not protrude between the sleeve portion and the outer ring of the bearing. A magnetic tape device having a hole forming a gap.

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