JPH02158949A - Tape loading device for rotary head type magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To reduce tape damage by driving belts which move loading bases with an eccentrically rotating sprocket and reducing the radius of rotation of the sprocket at the time of completion of loading. CONSTITUTION:When a cassette pack is loaded, pins provided on loading bases 15 and 16 are placed on the inside of a magnetic tape. When a sprocket 46 is driven by a motor M, two belts 41 and 42 are circularly driven and bases 15 and 16 are moved upward along grooves A and B independently of each other. Consequently, the magnetic tape is led out by pins of bases 15 and 16 and wound around a rotary head device 14. The sprocket 46 is eccentrically rotated, and belts 41 and 42 are driven with its smaller-diameter part at the time of completion of loading, and consequently, the movement speed of bases 15 and 16 is reduced and slowly wind the tape around the device 14. Thus, the tape damage can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to a rotary head type magnetic recording and reproducing device used in DAT, VTR, etc. The present invention relates to a tape loading device for winding.

[Prior art I] Rotary head magnetic recording and reproducing devices used in DATs, VTRs, etc. are equipped with a tape loading device, and the magnetic tape in the loaded cassette pack is pulled out by this tape loading device, and the magnetic tape is The tape is adapted to be wrapped around a rotating head device.

In this tape loading device, a pair of loading bases equipped with loading pins (or loading posts or loading rollers) for pulling out the magnetic tape are driven in the direction of winding the magnetic tape around a rotating drum. There is. Traditional·
In a rotary head type magnetic recording/reproducing device, the pair of loading bases described above are driven by a link mechanism or the like. However, when driven by a link mechanism, the driving mechanism is complicated and the number of parts increases.

Therefore, as shown in FIG. 8, there is a device in which the loading base is driven by a belt. This is, for example, the same type as that disclosed in Japanese Utility Model Application No. 62-175442.

In this conventional example, loading bases 2 and 3 are movably guided on a chassis 1 in directions indicated by A and B, respectively. Each loading base 2 and 3 has loading pins 2a, 2b and 3a, 3b.
is installed. By moving the loading bases 2 and 3 upward from the bottom side of FIG. 8, the magnetic tape in the cassette pack C is
b, 3a and 3b, and the magnetic tape is wound around the rotary head device 4 (
(The magnetic tape is indicated by a chain line T.) 1 For example, in the device disclosed in Japanese Utility Model Application No. 175442/1983, the loading bases 2 and 3 are driven by a toothed belt 5. The loading base 2 is fixed to the toothed belt 5 at a portion 5a, and the loading base 3 is fixed to a portion 5b. Reference numerals 6a to 6e designate guide rollers or guide gears for supporting the toothed belt 5 so that it can rotate.

The toothed belt 5 is driven by two driving gears 7 and 8. These two drive gears 7 and 8 are driven in synchronization with each other by a motor. When the toothed belt 5 is driven in the direction of arrow α, the magnetic tape T is pulled out from the cassette pack C and wound around the rotary head device 4. Also, when the toothed belt 5 is driven in the direction opposite to the arrow α, the loading bases 2 and 3
8 [Problems to be Solved by the Invention] However, the conventional example shown in FIG. 8 has the following problems.

In this type of device, the toothed belt 5 is always driven in the same state by drive gears 7 and 8. That is,
During the process from when the loading bases 2 and 3 are positioned in the cassette pack C to when the loading of the magnetic tape is completed as shown in FIG. The load torque transmission state when power is transmitted to each of the drive gears 7 and 8 is substantially constant. If the speeds of the loading bases 2 and 3 are always constant, when the magnetic tape is wound around the rotary head device 4 and when the magnetic tape in the cassette pack C starts to be pulled out by the loading bins 2a, 2b and 3a, 3b, There is a disadvantage that the magnetic tape is easily damaged due to sudden tension or pulling force acting on the magnetic tape6.Furthermore, in the tape loading device of a rotating head type magnetic recording/reproducing device, the magnetic tape T is rotated as shown in Fig. 8. A catcher (not shown) holds the loading bases 2 and 3 while being wrapped around the head device 4.
each loading pin 2a, 2b and 3a.

3b needs to be positioned. In the conventional example described above, when the loading bases 2 and 3 are pressed against the catcher and positioned, the tension acting on the toothed belt 5 acts on the drive gears 7 and 8 without being adjusted in any way. Therefore, a large load torque acts on the motor when loading is completed. Therefore, as for the capacity of the motor used, it is necessary to consider the time when the load torque is at its maximum as described above, which necessitates installing a motor with a larger output than necessary, and also increases power consumption. .

The present invention solves the above-mentioned conventional problems, and is capable of reducing the tape pull-out speed at the time of completion of loading when the magnetic tape is wound around a rotary head device, thereby reducing the tension acting on the magnetic tape. It is an object of the present invention to provide a tape loading device for a rotary head type magnetic recording/reproducing device in which the load torque acting on a motor can be made as small as possible.

[Means for Solving the Problems] A tape loading device in a rotary head type magnetic recording and reproducing device according to the present invention has a pair of loading bases on which loading pins are mounted, and a loading pin is mounted inside a magnetic tape in a cassette pack. The magnetic tape is guided so as to be movable from the opposing position to the position where the magnetic tape pulled out by the loading pin is wound around the rotary head device, and is connected to each of the above loading bases so that the loading base is guided along the guide direction. In a tape loading device for a rotary head type magnetic recording/reproducing device, which is provided with a belt arranged to follow a drivable circular locus and a driving rotating body that drives the belt, the driving rotating body drives the belt. When the loading base moves to a position where the magnetic tape is wound around the rotating head device, the circumferential surface having a small radius relative to the rotating shaft of the driving rotor is formed eccentrically with respect to the rotating shaft. is characterized in that it drives the belt.

[Operation] In the above means, the belt for moving the loading base is driven by the drive rotor that rotates eccentrically. When the tape loading is completed, the portion of the drive rotary body with a small rotation radius drives the belt.

Therefore, when tape loading is completed, the moving speed of the loading base is slowed down so that the magnetic tape is slowly wound around the rotating head device.
Tape damage is reduced. Also, when loading is completed, the loading base is pressed against the catcher, and the pinch roller is pressed against the capstan, increasing the tension acting on the belt. As a result, the load torque acting on the drive rotating body is reduced, and an increase in motor load can be prevented. Moreover, the circumference of the belt driving peripheral surface of the driving rotor can be increased while keeping the load torque small in the above case.
This means that the travel time of the loading base, that is, the time required for loading, can be reduced.

Embodiments] Embodiments of the present invention will be described below with reference to the drawings of FIGS. 1 to 7.

1 and 2 are plan views showing each operation of an embodiment of the tape loading device in the rotary head type magnetic recording/reproducing apparatus of the present invention, and FIG. 3 is a perspective view showing the rotating state of the belt.
Fig. 4 is a perspective view showing the overlapping state of the belts, Fig. 5 is an exploded perspective view showing the connecting portion between the loading base and the belt, and Figs. 6A to 6C are plan views showing the rotational movement of the rotary drive body. be.

In FIGS. 1 to 3, reference numeral 11 indicates a chassis. 1 and 2 show the chassis 11 from the cassette pack loading side, and FIG. 3 shows the chassis 11 from the back and side.

A supply reel stand 12 and a take-up reel stand 13 are arranged on the front side of the chassis 11, and tape reels in the cassette pack are installed on these reel stands 12 and 13, respectively. Further, a rotating head device 14 is installed above the drawings in FIGS. 1 and 2.

The rotating head device 14 is composed of a fixed drum and a rotating drum that is driven to rotate on the fixed drum, and this rotating drum is equipped with a plurality of magnetic heads.

Two guide grooves A and B are formed in the chassis 11. These two guide grooves A and B extend from a position close to the reel stands 12 and 13 to positions on both sides of the rotary head device 14 at approximately V.
A loading base 15 is slidably guided in the guide groove A, and a loading base 16 is slidably guided in the guide groove B. One loading base 15 is equipped with loading pins 17a and 17b for pulling out the magnetic tape, and the other loading base 16 is equipped with loading pins 18a and 18b. Also, catchers 51 and 52 are provided at the upper ends of each guide groove A and B.
are provided for each.

FIG. 5 shows an exploded perspective view of one of the loading bases 16 attached to the chassis 11 from the back side of the chassis 11. Guide protrusions 16a and 16b are protruded from the back surface of the loading base 16, and the pair of guide protrusions 16a and 16b are inserted into the guide groove B to guide the guide without causing play. It is designed to be able to slide within the groove B.

A backing plate 19 is attached to the lower surface side of the loading base 16 with the chassis 11 in between. This patch plate 19
The small hole 19a is fitted into the bottle 16c protruding from one of the protrusions 16b on the back surface of the loading base 16. Further, a V-shaped positioning groove 19b is formed in the backing plate 19, and this positioning groove 19b is fitted into the convex portion 16a, thereby positioning the backing plate 19. Furthermore, a bracket 21 is attached to the back surface of the backing plate 19. A hole 21a is bored in this bracket 21, and the bin 16c is inserted through the hole 21a, so that the bracket 21 is rotatably supported. The bracket 21 is formed with an elongated part 21b, and the bin 23 provided on the slider 22 installed on the elongated part 21b is inserted into this elongated part 21b, so that the slider 22 can move relative to the bracket 21. ing. A first support portion 24 is formed on the bracket 21, and the slider 2
A second support portion 25 is formed on 2. A coil spring 26 is hung between the bracket 21 and the slider 22.
is biased in the direction in which the respective supports 24 and 25 approach each other. The support structure of the loading base 15 slidably provided in the other guide groove A is also the same as that of the loading base 16, and as shown in FIG. 3, a backing plate 29 is installed on the lower surface of the loading base 15. Further, a bracket 31 is rotatably supported. The bracket 31 is provided with a slider, and the bracket 31 is provided with a first slider.
A second support part 35 is provided on the slider, and a coil spring 36 is provided to urge both support parts 34 and 35 toward each other.

As shown in FIG. 3, two belts 41 and 42 are provided on the back surface of the chassis 11. One belt 41 drives the bracket 21 on the guide groove B side and the loading base 16, and the other belt 41 drives the bracket 21 and loading base 16 on the guide groove B side. The bracket 31 on the guide groove A side and the loading base 15 are driven by the belt 42. The belts 41 and 42 are thin flat belts made of a rigid material. Specific materials include a metal plate such as stainless steel or a flat plate made of rigid resin. As shown in FIG. 4, the belts 41 and 42 are supported so that they can rotate in a partially overlapping state. Reference numerals 45a to 45e are guide rollers that support the belt, and 46 is a driving rotating body.

The belts 41 and 4 are connected from the guide roller 45e to the driving rotary body 46 and the guide rollers 45a, 45b, and 45c.
2 are overlapped, and in other parts, belts 41 and 42 rotate separately. As shown in FIG. 5, an end 41a of the belt 41 located on the inside is connected to the first support part 24, and the other end 41b is connected to the second support part 25. Similarly, as shown in FIG. 3, ends 42a and 42b of outer belt 42 are connected to first support 34 and second support 35, respectively.

As shown in FIG. 4, the belt 41 is formed with perforations 41c, and the other belt 42 is formed with perforations 42c. The drive rotating body 46
A sprocket 46a provided on the circumferential surface of each belt 4
Perforations 41c and 42 formed at 1 and 42
It is commonly engaged with c.

The drive rotary body 46 is configured such that the sprocket 46a rotates eccentrically, and the center of rotation of the sprocket 46a is provided at a position offset from the support shaft 47. A gear 4B is attached to the support shaft 4 on the lower surface of the drive rotor 46.
It is provided integrally with the driving rotary body 46 so that it can rotate about 7. The power of the motor M (see FIG. 1) is transmitted to the gear 48 via a group of reduction gears. In this reduction gear group, the reduction gears are driven by an ohm gear provided on the shaft of the motor M1.

Furthermore, as shown in FIGS. 1 and 2, a capstan 55 protrudes from the surface of the chassis 1. This capstan 55 is driven by a capstan motor M2. Reference numeral 56 is a pinch roller. This pinch roller 56 is connected to the belts 41 and 42.
It is moved from the position shown in FIG. 1 to the position shown by the broken line in FIG. 2 by a lever rotatably provided coaxially with the guide roller 45a on which it is hung. The lever for moving the pinch roller 56 is moved as described above by the power of the motor M via a reduction gear. In the play mode for recording or reproducing, the motor M+ further rotates to further drive the belts 41 and 42, and the pinch roller 56 moves the capstan 55 as shown by the solid line in the figure.
The capstan 55 and the pinch roller 56
A magnetic tape is now sandwiched between them.

Next, the tape loading operation will be explained.

FIG. 1 shows the unloading state, and loading bases 15 and 16 are in guide grooves A and B, respectively.
It is located at the lower end of the diagram. When the cassette pack is loaded, a pair of tape reels inside it are installed on the reel stands 12 and 13, and the loading bases 15 and 1 are placed inside the cassette pack.
Loading pins 17a, 17b and 18a, 18b provided at 6 are located inside the magnetic tape.

Motor M is started when loading of a cassette pack is detected or when a recording or playback operation is performed. The power of this motor M is transmitted to the gear 48 shown in FIG. 4 via a group of reduction gears, and the drive rotating body 46 is driven clockwise in FIG. 1.

A sprocket 46a provided on the drive rotor 46 connects the belts 41 and 4 through perforations 41c and 42c.
2 in the direction of arrow α.

By the rotation of the belts 41 and 42, the loading bases 15 and 16 are guided by the guide grooves A and B and are driven upward in FIGS. 1 and 2. At this time, the magnetic tape in the cassette pack is pulled out by loading pins 17a, 17b and 18a, 18b provided on loading bases 15 and 16, and the magnetic tape is wound around rotary head device 14 in the state shown in FIG.

As shown in FIG. 2, when loading is completed, the loading bases 15 and 16 are connected to the catcher 5, respectively.
1 and 52, and which is moved by the power of the motor M, is moved from the position shown in FIG. 1 to the position shown in broken lines in FIG. 2 along with the movement of the loading bases 15 and 16. In the play mode where recording or playback is performed, the motor M,
Then, the belts 41 and 42 are driven for an even shorter period of time, and the belts 41 and 42 are moved a shorter distance in the α direction.

At this time, the slider 22 is slightly pulled in the α direction on one loading base 16 side, and the slider is also slightly pulled on the other loading base 15 side, so that the coil springs 26 and 36 are each extended. The elastic force of the coil springs 26 and 36 brings the loading bases 15 and 16 into pressure contact with the catchers 51 and 52, and the loading pins 17a, 17b and 18a.

18b is positioned. At the same time, the pinch roller 56 is brought into pressure contact with the capstan 55 as shown by the solid line in FIG. 2 by the power of the motor M1, and the magnetic tape is sandwiched between the capstan 55 and the pinch roller 56. Note that at this time, the drive rotor 46 does not rotate in the reverse direction due to the load on the reduction gear group, and the motor M stops at the overrotation position.

In the above tape loading operation, when the loading operation is started as shown in FIG.
As shown in the figure, the belt is driven by the small radius portion (radius R) of the drive rotor 46 that rotates eccentrically. Therefore, the speeds of the belts 41 and 42 at the time of starting become slow, and the loading pins 17a, 17b and 18a provided on the loading bases 15 and 16,
The magnetic tape inside the cassette pack is slowly pulled out by 18b. Therefore, the damage inflicted on the magnetic tape is reduced. When the zero-order loading bases 15 and 16 reach the intermediate position between the guide grooves A and B, as shown in FIG. ) drives belts 41 and 42. At this time, the moving speed of the loading bases 15 and 16 becomes maximum. Further, when the loading is completed as shown in FIG. 2, the belt 41 is moved by the small radius portion (R1) of the driving rotor 46, as shown in FIG. 6C.
and 42 are driven. Therefore, at this time, the moving speed of the loading bases 15 and 16 is slow, and the tape is slowly wound around the rotary head device 14. Therefore, tape damage can be reduced at this time as well. Furthermore, the time required for the movement of the loading bases 15 and 16 is determined by the circumference of the sprocket 46a provided on the drive rotor 46, and by securing this circumference to a certain size, it is possible to Even if the speed of the loading base 15, 16 at the time of completion is slowed down, the overall loading time can be shortened.

Furthermore, during tape loading, the drive rotating body 46
The load torque acting on the drive radius (R
1, R-, Rs) and the belt load at that time (F, , F,
, F, ). FIG. 7 is a diagram showing the relationship between load torque and rotation angle of the drive rotor. In the same figure, (a) shows the case of an embodiment of the present invention using a drive rotor that rotates eccentrically, and (b) shows a case where the drive rotor of the same diameter is rotated without eccentricity. ing. As described above, when the loading is completed and the transition to the play mode occurs, the coil springs 26 and 36 shown in FIGS.
3) increases. Further, a load for bringing the pinch roller 56 into pressure contact with the capstan 55 also acts on the motor M1.

However, since the drive radius R3 of the drive rotor 46 at this time is small, it is possible to suppress an increase in the load torque acting on the drive rotor 46, as shown in (a') in FIG. The load torque is reduced compared to the case where a non-eccentric drive rotating body shown by (mouth') in FIG. 7 is used. Note that the load torque shown by (a) in FIG. 7 increases slightly during the loading operation.

This is due to the following reason. As shown in FIG. 6B, during loading, the belts 41 and 42 are driven by the large radius portion (R2). Also, these belts 41 and 4
This is because the circumferential length of the belt 2 is extended, and this extended portion is absorbed by the extension of the coil springs 26 and 36, and the belt load F2 increases by the extension of the coil springs 26 and 36.

In this way, when loading is completed, the drive rotating body 46
It is possible to suppress the load l and torque acting on the motor, and it is possible to give some margin to the motor load.

Next, when the cassette bag is ejected, the motor M is reversed from the state shown in FIG. 2, the belts 41 and 42 are driven in the direction opposite to α, and the loading bases 15 and 16 are guided Along grooves A and B, the first
It is driven to the position shown in the figure.

Note that the present invention can also be implemented when the loading base is driven by a single belt.

For example, in the conventional example shown in FIG. 8, if the drive gears 7 and 8 are rotated eccentrically, the same effects as in the above embodiment can be achieved.

〔effect〕

As described above, in the present invention, by providing the driving rotor that rotates eccentrically, the pulling speed of the magnetic tape when the magnetic tape is wound around the rotary head device can be reduced.
Tape damage can be reduced. Furthermore, the load torque can be reduced upon completion of loading and further upon transition to play mode, and the motor load can be reduced.

[Brief explanation of the drawing]

1 to 7 show embodiments of the present invention, and the first
2 and 2 are plan views showing each operation of the tape loading mechanism in a rotary head type magnetic recording/reproducing device from the front side of the chassis, FIG. 3 is a perspective view shown from the back side of the chassis, and FIG. 4 shows the overlapping state of the belts. FIG. 5 is an exploded perspective view showing the guide portion of the loading base from the back side of the chassis. FIGS. 6A to 6C are plan views showing the rotational states of the eccentrically rotating drive rotary body according to its operation. FIG. 7 is a diagram showing changes in the load torque of the driving rotating body during tape loading, and FIG. 8 is a plan view showing a tape loading device in a conventional rotary head type magnetic recording/reproducing device. 11...Chassis, A, B...Guide groove, 14...
- Rotating head device, 15. 16... Loading base, 17a, 17b, 18a, 18b - Loading pin, 21... Bracket, 22... Slider, 24
．． 25... Support part, 26... Coil spring, 4
1.42... Belt, 41c, 42c... Perforation, 46... Drive rotating body, 47... Support shaft, 48... Gear, M... Motor. Figure 5 Figure 8 Procedural Amendr Yo (Method) Display of the Case Person who amends the name of the invention of Patent Application No. 314756 of 1988

Claims (1)

[Claims] 1. A pair of loading bases on which loading pins are mounted move from the position where the loading pins face the inside of the magnetic tape in the cassette pack to the position where the magnetic tape pulled out by the loading pins is wound around the rotating head device. a belt that is freely guided and arranged to follow a circular locus that is connected to each of the loading bases and can drive the loading base along the guide direction; and a drive rotating body that drives the belt. In a tape loading device for a rotary head type magnetic recording/reproducing device, the drive rotor has a circumferential surface that drives the belt eccentrically with respect to the rotation axis, and the magnetic tape is loaded onto the rotary head device. In a rotary head type magnetic recording and reproducing device, the belt is driven by a circumferential surface having a small radius relative to the rotating shaft of the driving rotary body when the loading base moves to a position where the belt is wound. tape loading device