JPH10116453A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a motor and to reduce the loss of driving force in the transmission system of the driving force by rotating a roller on a tape cartridge side to move a transmission member by allowing the member to be direct contact with the roller to feed a magnetic tape. SOLUTION: A magnetic field is generated by performing energization with respect to the winding 49 of a stator S and a rotor R having a magnet 47 is rotated around a shaft 43 by this magnetic field with respect to a stator S. As a result, a pack 42 is rotated in a state in which it is directly pressed against the driving roller 23 side of the tape cartridge side. Since the pack 42 of a motor M and the rotor R are rotated in an E1 direction and the small radial part 23a of a driving roller 23 moves an elastic belt 33 in a D1 direction, a magnetic tape T being in between reels is fed in an S1 direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an endless transmission member accommodated in a tape cartridge which is moved by rotating a roller, and the movement of the transmission member causes the magnetic tape to move between a first reel and a second reel. The present invention relates to a motor for transporting a sheet between the motors.

[0002]

2. Description of the Related Art A magnetic tape device for recording information on a magnetic tape originated from audio recording.
Not only in this field but also as a magnetic recording device for recording television images and exchanging information as a peripheral device of a computer. As a magnetic tape device, for example, a 1/4 inch magnetic tape device is a QIC (Q
(Urter Inch Cartridge) drive or simply QIC. In recent years, the market of this type of magnetic tape device has been expanding as a computer peripheral device for data backup. A magnetic tape device used for data backup saves data in a main memory or an external memory (particularly a hard disk drive) device frequently used in a computer system to another medium in case of emergency. I do. QI
In recent years, magnetic tape devices such as C have been designed so that the size of the drive has been reduced and the thickness of the drive can be accommodated in a slot (or drive bay) of a 1-inch height format computer.

FIG. 6 shows an example of a motor in a conventional magnetic tape device. The drive roller 1 on the tape cartridge side mounted on the magnetic tape device is structured so as to rotate while being in contact with the drive side pack 2 on the drive motor 8 side. When the drive roller 1 rotates, the elastic belt 33 moves, and the movement of the belt 33 feeds the magnetic tape between the unwinding reel and the take-up reel in the tape cartridge. The pack 2 is mounted on a shaft 3 for driving the pack. The shaft 3 is rotatably supported on a base plate 9 via a bearing housing 4.
A pack pulley 5 is attached to an end of the shaft 3. On the other hand, a pulley 7 on the motor side is attached to the output shaft 8a of the driving motor 8. The stator of the motor 8 is mounted on a base plate 9. The base plate 9 is fixed to a chassis (not shown) with fixing screws 10. The pulley 7 is connected to the pulley 5 by a belt 6. The drive roller 1 on the cartridge side is made of an elastic material such as NBR (acrylonitrile butadiene rubber) or urethane rubber, and the pack 2 presses the drive roller 1 to rotate the drive roller 1. That is, when the motor 8 is operated, the pulley 7 and the pulley 5 are rotated by the belt 6 and the pack 2 is rotated. As a result, the roller 1 moves the elastic tape 33, and the elastic tape 33
, The magnetic tape is fed between the unwinding reel and the take-up reel in the forward or reverse direction.

[0004]

As described above, in the conventional magnetic tape device, since the motor 8 drives the pack 2 indirectly through the belt 6, the driving force transmission system is used. A drive loss is generated, the structure is complicated, the device cannot be made compact, and the assembly is troublesome. Also, in this type of magnetic tape device, in order to fast-forward and rewind the magnetic tape at high speed,
The current consumption of the motor is larger than that of a magnetic disk device such as a hard disk device. Therefore, the temperature rises due to the heat generated by the windings of the motor, and the temperature rise has become a problem due to the demand for miniaturization of the magnetic tape device.
It is necessary to take countermeasures. SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-described problems, to provide a motor that can reduce the size of a driving force transmission system, can be reduced in size, can be easily assembled, and can prevent a rise in temperature.

[0005]

According to the present invention, an endless transmission member accommodated in a tape cartridge is moved by rotating a roller, and the magnetic tape is moved by the movement of the transmission member. The first reel and the second reel
A motor for transporting between a reel, a stator, a rotor rotatably supported via a bearing with respect to the stator, and rotating with respect to the stator when energized, and a tape cartridge provided around the rotor. And a feed member for feeding the magnetic tape by moving the transmission member by directly contacting and rotating the side rollers. According to the present invention, the rotor is rotatably supported by the stator via a bearing, and rotates with respect to the stator by energization. The feed member is provided around the rotor. A feed member provided on the rotor directly drives the roller on the tape cartridge side. Accordingly, the driving force of the motor is directly transmitted to the transmission member via the feed member and the roller. When the transmission member moves, the magnetic tape can be transported. Therefore, the size of the motor can be reduced, and the driving force loss in the driving force transmission system can be reduced.

[0006]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

First Embodiment FIG. 1 shows a magnetic tape device 20 driven by a motor M according to the present invention. The magnetic tape device 20 is, for example, a 1/4 inch type magnetic tape device, and is also called a QIC drive or simply QIC (quick). The magnetic tape device 20 includes a cartridge insertion portion 21.
The cartridge C can be inserted into the magnetic tape device 20 from the cartridge insertion portion 21.

FIGS. 2 and 4 show the magnetic tape device 20 of FIG.
The cartridge C is inserted into the magnetic tape device 20 in a simplified manner. This cartridge C is a QIC cartridge,
The shell 22 has a substrate 200 and a cover 201 as shown in FIG. A drive roller 23, corner rollers 24 and 25, guides 27 and 28, reels 29 and 30,
Guide pins P1, P2, P3 are arranged. Between the corner rollers 25 and 24 and the drive roller 33 in FIG.
An elastic belt 33 is provided, and the elastic belt 33 is a guide mechanism for stably feeding the magnetic tape T on the reels 29 and 30. The elastic belt 33 is a transmission member having a smaller elastic force than the magnetic tape T. The path of the elastic belt 33 contacts the outer periphery of the magnetic tape T of the reel 30 via the corner rollers 25 and 24, contacts the small diameter portion 23 a of the drive roller 23 in FIG. The endless belt is in contact with the outer periphery and returns to the corner roller 25. On the other hand, the magnetic tape T of the reel 29 includes the guide 27, the guide 28, the pins P1, P
The reel 30 is reached via P2 and P3. Reel 29
, The head H of the magnetic tape device 20 is positioned. The head H is a head that records information on the magnetic tape T and reproduces information already recorded on the magnetic tape T.

The magnetic tape device 20 has a motor M. In this motor M, a ring-shaped pack 42 as a feed member is arranged. The motor M shown in FIG. 3 is a motor for driving the magnetic tape T of the cartridge C shown in FIG. Note that the cartridge C has an access door 34. The access door 34 is a door that opens to access the head H to the magnetic tape T.

The motor M shown in FIG. 3 has a rotor R and a stator S. First, the rotor R will be described. Rotor R
Is rotatably supported by a bearing (corresponding to a first bearing) 46 and a bearing (second bearing) 52 with respect to the stator S. The rotor R includes a pack 42, a shaft 43, a boss 44, a rotor case 45, a driving magnet 47, and the like. The boss 44 is made of, for example, brass or the like.
Is fixed to the upper end portion by press-fitting, for example. The boss 44 fixes the upper end of the rotor case 45 by caulking, for example. Therefore rotor case 4
5 is fixed to the shaft 43 via the boss 44. The rotor case 45 plays the role of a yoke for the driving magnet 47, is made of a magnetic material such as a galvanized steel plate, and has a substantially cylindrical shape.

The magnet 47 has a substantially ring shape and is fixed inside the rotor case 45 by, for example, an adhesive. The magnet 47 is, for example, a plastic magnet in which N poles and S poles are alternately magnetized along the circumferential direction. The pack 42 is fixed around the rotor case 45. This pack 42 is also a ring-shaped member, and the drive roller 2 on the cartridge C side
This is the part to be pressed against the third. Pack 4
Reference numeral 2 is made of an elastic member such as rubber such as NBR (acrylonitrile butadiene rubber) or urethane rubber. Pack 42 is placed around rotor case 45.
It can be fixed by an adhesive or provided by integral molding.

Next, the stator S will be described. The stator S includes a laminated iron core 48, a winding 49, a base plate 50, a bearing housing 51, and a bearing (first bearing) 4.
6, a bearing (second bearing) 52 is provided. The bearing 46 is
It is set for the upper end of the bearing housing 51.
On the other hand, another bearing 52 is provided in the bearing housing 5.
1 is set at the lower end. The set span of the two bearings 46 and 52 is indicated by SP in FIG. Specifically, the outer ring 46a of the bearing 46 is fixed to an upper portion of the bearing housing 51, and the outer ring 52a of the bearing 52 is
1 is fixed to the lower part. The inner rings 46b and 52b are fixed to the shaft 43 by bonding or the like.

For this reason, the rotor R has two bearings 4
6 and 52, it is rotatably supported by the bearing housing 51 of the stator S. Bearing housing 51
Is fixed to the base plate 50 by caulking or the like. The laminated iron core 48 is formed by laminating electromagnetic steel sheets such as a silicon steel sheet, for example, and a winding 49 is provided around the laminated steel sheet. The iron core 48 is fixed around the bearing housing 51 and faces the magnet 47 in the diameter direction. The fastening means of the rotor case 45 and the boss 44 and the fastening means of the base plate 50 and the bearing housing 51 adopt a caulking method in FIG.
Of course, bonding or screwing may be used.

In FIG. 3, an operating point MP at which the pack 42 and the drive roller 23 on the cartridge side are in contact with each other.
Is the set span S of the bearing 46 and the bearing 52 in the axial direction.
It is located within the range of P. Similarly, the center points CP1 and CP2 in the longitudinal direction (axial direction of the shaft 43) of the driving magnet 47 and the iron core 48 are also located between the set spans SP. By doing so, the rigidity of the motor M in the radial direction is increased, so that there is an effect of suppressing vibration accompanying the driving of the motor M itself and external vibration due to tape driving. That is, since vibration during tape running is suppressed, stable running of the magnetic tape is obtained, so that reliability of data recording and reproduction is improved, and vibration and acoustic noise of the entire apparatus can be suppressed.

Next, an operation example of the motor M will be described. The cartridge C in FIG.
The cartridge is inserted from the cartridge insertion portion 21. When the access door 34 is opened as shown in FIG. 2, the head H comes into contact with the magnetic tape T, and the pack 42 of the motor M is driven by the drive roller 23 on the cartridge C side.
Contact directly. First, a magnetic field is generated by energizing the winding 49 of the stator S, and the rotor R having the magnet 47 rotates about the shaft 43 with respect to the stator S by the magnetic field. Thereby, the pack 42 of FIG. 4 rotates while being directly pressed against the drive roller 23 side. The pack 42 and the rotor R of the motor M shown in FIG.
The magnetic tape T between the reels 29 and 30 is sent in the S1 direction by rotating the elastic belt 33 in the D1 direction by the small diameter portion 23a of the drive roller 23 rotating in the X direction. Conversely, the pack 42 and the rotor R of the motor M rotate in the E2 direction, and the small-diameter portion 23a of the drive roller 23 moves the elastic belt 33 in the D2 direction, so that the magnetic tape T between the reels 29 and 30 moves in the S2 direction. Sent.

As described above, in the embodiment of the present invention, the pack 42 of the rotor R of the motor M can directly rotate the drive roller 23 on the tape cartridge side. In this point, unlike the prior art, in the prior art, the drive side pack 2 of FIG. 4 is indirectly driven via a belt to rotate the tape cartridge side drive roller. Thus, the structure is simple, and the transmission loss of the driving force can be reduced. Since a space for a belt is not required, space saving around the motor M shown in FIG. 3 can be achieved, the structure is simplified, the number of parts is reduced, and assembly is easy.

Moreover, the operating point MP of the pack 42 of the rotor R and the driving roller 23 is located between the set spans SP of the bearings 46 and 52, and the center point CP1 of the magnet 47 and the center point of the laminated iron core 48. Since the CP2 is also located between the set spans SP, the radial rigidity of the motor M can be increased, and the effect of suppressing the vibration accompanying the driving of the motor M itself and the external vibration due to the tape driving can be exerted. it can. Incidentally, the diameter d of the rotor R in FIG. 3 is set to be substantially the same as or larger than the outer diameter D of the pack 42. This is because packs 42, 1
This is because 42 can be fitted and attached to the outer peripheral portion of the rotor case 45 of the rotor R.

Second Embodiment A motor M1 shown in FIG. 5 is a motor according to a second embodiment for driving the magnetic tape T of the cartridge C shown in FIG.

The motor M1 shown in FIG.
It has. First, the rotor R will be described. The rotor R is rotatably supported by the bearing 146 and the bearing 152 with respect to the shaft 143 of the stator S. The rotor R is
A pack 142, a bearing housing 104, a rotor case 145, a driving magnet 147 and the like are provided. The bearing housing 104 is made of a material having excellent heat dissipation properties, for example, brass, aluminum alloy, zinc alloy, etc.
The heat radiating means 105 is provided. The heat radiating means 105 has a plurality of fins F, and a groove 106 is formed between the fins F over the entire circumference. Moreover, the fin F and the groove 106
Are along the rotation direction of the rotor R, and the rotor R can be efficiently cooled when the rotor R rotates. The heat radiation groove 106 is
Although it can be made by cutting, when the bearing housing 104 is made by die casting, it can be realized easily and inexpensively by a die casting die. The rotor case 145 serves as a yoke for the driving magnet 147, is made of a magnetic material such as a steel plate, and has a substantially cylindrical shape.

The magnet 147 has a substantially ring shape and is fixed inside the rotor case 145 by, for example, an adhesive. The magnet 147 is made of a magnetic material, and is, for example, a plastic magnet in which N poles and S poles are alternately magnetized along the circumferential direction. A pack 142 is fixed around the rotor case 145. The pack 142 is also a ring-shaped member, and is a portion to be pressed against the drive roller 123 on the cartridge C side. Pack 142 is an NBR
(Acrylonitrile butadiene rubber) or an elastic member such as rubber such as urethane rubber. Pack 1
The reference numeral 42 may be fixed to the periphery of the bearing housing 104 with an adhesive or provided by integral molding.

Next, the stator S will be described. The stator S includes a shaft 143, a laminated iron core 148, and a winding 14.
9, motor base 111, shaft support 111a, bearing 14
6,152. The bearings 146 and 152
43 are set side by side between the upper end of the bearing 43 and the bearing housing 104. Specifically, an outer ring 146 a of the bearing 146 is fixed to an upper portion of the bearing housing 104, and an outer ring 152 a of the bearing 152 is fixed to a lower portion of the bearing housing 104. Inner ring 146b of bearing 146 and inner ring 1 of bearing 152
52b is fixed to the shaft 143 by bonding or the like.

From this, the rotor R is mounted on the bearing 146, 1
Using 52, it is supported rotatably with respect to the shaft 143 of the stator S. The shaft 143 is fixed to the shaft support 111a. The motor base 11 has a harness 112 for external connection. The laminated iron core 148 is formed by laminating electromagnetic steel sheets such as a silicon steel sheet, for example. The iron core 148 is fixed around the shaft supporting portion 111a, and faces the magnet 147 in the diametric direction. Rotor case 145
Although the caulking method is adopted in FIG. 6 for the fastening means between the shaft and the bearing housing 104, it is needless to say that bonding or screwing may be used.

Next, an operation example of the motor M1 will be described. The cartridge C in FIG.
No. 0 is inserted from the cartridge insertion portion 21. When the access door 34 of the cartridge C is opened as shown in FIG. 2, the head H comes into contact with the magnetic tape T, and the pack 42 of the motor M1 shown in FIG.

First, a magnetic field is generated by energizing the winding 149 of the stator S, and the rotor R having the magnet 147 rotates about the shaft 143 with respect to the stator S by this magnetic field. Thereby, the pack 14
2 rotates while being directly pressed against the drive roller 23 side. The pack 142 and the rotor R of the motor M1 shown in FIG.
The magnetic tape T between the reels 29 and 30 is sent in the S1 direction by rotating in one direction and the small diameter portion 23a of the drive roller 23 moving the elastic belt 33 in the D1 direction.
Conversely, when the rotor R of the motor M1 rotates in the direction E2 and the small-diameter portion 23a of the drive roller 23 moves the elastic belt 33 in the direction D2, the magnetic tape T between the reels 29 and 30 is sent in the direction S2.

When the rotor R of the motor M1 rotates, since the heat radiating means 105 is provided on the rotor R, the surface area for cooling is larger than that in the case where the heat radiating means is not provided, and the groove 106 extends along the rotating direction. In addition, the cooling action works with the rotation of the rotor R. Since there is a groove 106 for heat radiation, the rotor R
It is conceivable that a power transmission loss due to windage may occur at the time of rotation. However, considering the load of the motor M1 for pressing and driving the drive roller 23, the windage is very small and almost negligible, and has no adverse effect. .

The heat radiation means provided on the rotor of the motor M1 according to the second embodiment can be provided on the motor M shown in FIG. By providing the heat radiating means 105 to the rotor R as in the second embodiment, it is possible to prevent the temperature of the motor M1 from rising due to the heat generated by the windings of the motor M1, and to reduce the size of the magnetic tape device. As in the first and second embodiments, the tape drive packs 42 and 142 are provided directly on the rotor R, and the packs 42 and 142 that rotate together with the rotor R drive the drive roller 23 on the tape cartridge side. Since the magnetic tape T is fed using the elastic belt 33, the transmission loss of the driving force for feeding the magnetic tape T can be reduced.

[0027]

As described above, according to the present invention,
Loss of the driving force transmission system can be reduced, miniaturization can be achieved, and temperature rise can be prevented.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a magnetic tape device including a motor according to the present invention.

FIG. 2 is a plan view showing the inside of the magnetic tape device of FIG. 1 and an example of a cartridge.

FIG. 3 is a partially cutaway side view showing an example of the motor shown in FIG. 2;

FIG. 4 is a perspective view showing a motor and a tape cartridge according to the first embodiment of the present invention.

FIG. 5 is a diagram showing a motor according to a second embodiment of the present invention.

FIG. 6 is a diagram showing an example of a conventional indirect drive type motor.

[Explanation of symbols]

23 ... the drive roller on the tape cartridge side,
..Elastic belt (transmission member), 42 ... pack (feed member), 43 ... shaft, 44 ... boss, 4
5: rotor case, 46: bearing (first bearing), 47: magnet, 48: laminated iron core, 4
9 ... winding (coil), 50 ... base plate,
51 ... bearing housing, 52 ... bearing (second bearing), 104 ... heat dissipation means, 106 ... heat dissipation groove,
F: radiation fin, C: tape cartridge (cartridge), MP: operating point, SP: set span, CP1, CP2: center point, R: rotor, S ... Stator

Claims (6)

[Claims] An endless transmission member accommodated in a tape cartridge is moved by rotating a roller, and the movement of the transmission member causes a magnetic tape to be transported between a first reel and a second reel. In the motor of the above, a stator, and rotatably supported via a bearing with respect to the stator,
A rotor that rotates with respect to the stator when energized; and a feed member that is provided around the rotor and that directly contacts and rotates the roller on the tape cartridge side to move the transmission member and feed the magnetic tape. A motor characterized in that: 2. A rotor is rotatably supported by a first bearing and a second bearing with respect to a stator. An operation point at which a feed member and a roller on a tape cartridge side are in contact with each other, a magnet of the rotor and an iron of the stator. The center point in the rotation axis direction of the rotor with respect to the core is defined by the first bearing and the second bearing.
2. The motor according to claim 1, wherein the motor is located between bearings. 3. The motor according to claim 1, wherein the diameter of the rotor is set substantially equal to or smaller than the diameter of the feed member. 4. The motor according to claim 1, wherein the rotor has heat radiation means. 5. The motor according to claim 1, wherein the heat radiating means has a plurality of fins. 6. The magnetic tape of the tape cartridge comprises:
2. The motor of claim 1 wherein the motor is a quarter inch cartridge tape.