JPH04358343A - Recording and reproducing device - Google Patents

Abstract

PURPOSE:To execute the high-speed fast forwarding and rewinding of a reel stand and the low-speed forward turn and reverse by selectively engaging the two layers of oscillation gear units equipped with a friction mechanism to the two layers of intermediate gears which always engage the reel stand. CONSTITUTION:At a first height, an oscillation gear unit 30 is decelerated by the large and small gears of the oscillation gear unit 30 and the intermediate large and small gears through a friction means 33. The deceleration is transmitted to any one of reel stands 9 and 13 by the oscillation gear unit 30 to be moved according to the turning direction of a motor 2 and the reel stand is rotated in a low-speed rotation mode. At a second hight, the oscillation gear unit 30 is not decelerated by the first large diameter gear of the oscillation gear unit 30 and the intermediate small gear without interposing the friction means, such a state is transmitted to any one of the reel stands 9 and 13 by the oscillation gear unit 30 which is moved according to the turning direction of the motor 2 and the reel stand is rotated in a high-speed rotation mode.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording/reproducing apparatus such as a digital audio tape recorder, and more particularly to a reel stand drive mechanism.

0002

[Background Art] In recent years, recording and reproducing devices have become smaller, thinner,
There is a trend toward weight reduction, and recent digital audio tape recorders are no exception, and there is a desire to make them even smaller and thinner.

[0003] Devices that record and playback using tape, such as digital audio tape recorders, are equipped with a supply reel stand and a take-up reel stand, and when the tape is made to travel in the forward direction, the take-up reel stand is driven in the tape winding direction. However, when the tape is made to run in the reverse direction, the supply reel stand is driven in the tape winding direction.

[0004] Furthermore, when performing recording or playback, the tape is run at a relatively slow speed using a capstan rotated at a constant speed by a motor and a pinch roller crimped with the tape in between, and the tape is fast-forwarded or wound. When returning the tape, the reel stand in the tape winding direction is rotated at high speed to cause the tape to run at high speed.

Therefore, as means for driving the reel stand, it is necessary to have a low-speed rotation mode and a high-speed rotation mode, and also select one of the reel stands depending on the tape running direction to wind the tape. A configuration that allows rotation in the picking direction is required. Such a recording/reproducing apparatus is disclosed in Japanese Patent Laid-Open No. 1-106352.

[0006]

[Problems to be Solved by the Invention] However, although the conventional configuration has the advantage of not having to provide a complicated switching means to selectively rotate the reel base depending on the tape running direction, the high speed rotation of the reel base In order to switch between low-speed and low-speed rotation, it is necessary to provide a dedicated swing gear unit for each, resulting in a complicated mechanical configuration that requires a large number of parts and increases the size of the device.

In addition, many configurations are adopted in which the bearing part of the swing unit is shared with the center shaft of the drive gear, and as a result, the bearing part becomes thicker and it is difficult to apply a biasing force to the swing gear unit according to the direction of rotation. A large friction torque is required for the friction means between the swing gear and the swing lever to be generated, and the structure of the friction means requires a large area and thickness, and the large friction torque becomes a load on the motor, leading to power loss. When the device is powered by batteries, the battery life becomes short and the motor itself has to be made larger.

In addition, in a mechanism that moves gears in the axial direction to switch the reduction ratio and realize high-speed rotation and low-speed rotation, the tips of the gear teeth come into contact with each other during switching, and if the switching is repeated many times, the tips of the gear teeth may come into contact with each other. This has had problems such as damage and abnormal contact noise during switching.

The present invention solves the above-mentioned conventional problems by providing a high-speed and low-speed drive device for a reel stand with a small number of parts, realizing an oscillating gear mechanism with a small load on the motor, and realizing a high-speed and low-speed mode driving device. It is an object of the present invention to provide a recording/reproducing device that can switch with high reliability, can have a thin laminated gear structure, and can have most of these mechanisms small and thin between two reel stands. purpose.

0010

[Means for Solving the Problems] The recording and reproducing device according to claim 1 of the present application includes a pair of reel stands each having a gear portion, and a large diameter portion integrally formed with a small diameter portion gear that is constantly meshed with the gear portion of the reel stand. a pair of intermediary gears having a partial gear; a drive gear that drives the capstan; a large-diameter first gear that rotates while constantly meshing with the drive gear; and a rotation that is limited by friction means from the first gear. A swing gear unit consisting of a small-diameter second gear to which torque is transmitted concentrically and is biased with a moving force according to the rotational direction of the drive gear, a large-diameter gear of an intermediary gear, and a swing gear unit. At the first height position of the oscillating gear unit in which the second gear of the oscillating gear unit can be engaged, rotational torque limited according to the rotational direction of the drive gear is transmitted to either reel stand, and the small diameter of the intermediate gear is At the second height position of the swing gear unit where the first gear of the swing gear unit can mesh with the first gear of the swing gear unit, the rotational torque that is not limited by the friction means is applied to one of the two depending on the rotational direction of the drive gear. The configuration is such that the information is transmitted to the reel stand.

The recording/reproducing device according to claim 2 of the present application includes a pair of reel stands having a gear portion, and a small diameter gear that is always meshed with the gear portion of the reel stand and is integrally formed with the small diameter gear. a pair of intermediary gears having a large diameter gear;
A drive gear that rotates by being transmitted with the rotational force of the motor that drives the capstan, a large-diameter first gear that rotates in constant mesh with the drive gear, and a large and small gear that is the same as the intermediate gear for the first gear. an oscillating gear unit consisting of a small-diameter second gear having a diameter difference and concentrically transmitting rotational torque limited by a friction means; The first gear of the rocking gear unit in which the large diameter gear of the gear and the second gear of the rocking gear unit can mesh with each other.
At the height position, rotational torque limited according to the rotational direction of the drive gear is transmitted to either one of the reel stands, and the small diameter gear of the intermediary gear and the first gear of the swing gear unit can mesh with each other. At the second height position of the swing gear unit, there is a swing gear mechanism that transmits rotational torque that is not limited by the friction means to either reel stand depending on the rotational direction of the drive gear, and a swing gear mechanism that is opposite to the drive gear. A swinging lever that has a swinging center on the side and does not overlap with the gears in a plane and holds the swinging gear unit rotatably at the end, and a swinging lever that is gripped from above and below at the swinging center. The apparatus also includes a moving member that moves up and down between a first height position and a second height position of the swing gear unit using a moving means.

[0012] The recording/reproducing device according to claim 3 of the present application has a slight degree of freedom in positioning the swing gear unit in a position where it does not mesh with either of the intermediary gears at its first height position and second height position. and a regulating member that regulates swinging.

Further, in the recording/reproducing apparatus of claim 4 of the present application, the meshing width in the axial direction of the large diameter gear of the pair of intermediary gears and the second gear of the swing gear unit is greater than that of the small diameter gear of the pair of intermediary gears. This width is narrower than the axial meshing width of the first gear of the swing gear unit.

[0014]

[Operation] In the recording/reproducing apparatus according to claim 1 of the present application, the rotation of the motor that drives the capstan is transmitted to the drive gear by the above-described configuration, and when the swing gear unit is at the first height position,
The rotational torque limited by the friction means is decelerated by the large and small gears of the swing gear unit and the large and small gears of the intermediary gear, and the swing gear unit, which is biased to move by the rotational direction of the motor, moves one reel stand. is transmitted, and the reel stand rotates in a low speed rotation mode. Also. At the second height position of the swing gear unit, the rotational torque that is not limited by the friction means of the swing gear unit is not reduced by the first large diameter gear of the swing gear unit and the small diameter gear of the intermediate gear, A swing gear unit that is biased to move according to the rotational direction of the motor transmits the force to one of the reel stands, and the reel stands rotate in a high-speed rotation mode.

In the recording and reproducing apparatus according to claim 2 of the present application, the rotation of the motor that drives the capstan is transmitted to the drive gear by the above-described configuration, and the swing lever having a swing center on the opposite side from the drive gear is provided. When the swing gear unit is moved up and down by the moving member to the first height position, the rotational torque limited by the friction means is applied to the large and small gears of the swing gear unit and the large and small gears of the intermediate gear. is transmitted to one of the reel stands by a swinging gear unit that is urged to move in the rotational direction of the motor, and the reel stands rotate in a low-speed rotation mode. Furthermore, when the swing lever moves and the swing gear unit moves to the second height position, the rotational torque that is not limited by the friction means is transferred to the first large diameter gear of the swing gear unit. The rotation speed is not reduced by the small-diameter gear of the intermediary gear, but is transmitted to one of the reel stands by the swinging gear unit that is moved and urged by the rotational direction of the motor, and the reel stands rotate in a high-speed rotation mode.

[0016] In the recording/reproducing apparatus according to claim 3 of the present application, when the swing gear unit rotatably held on the swing lever by the movable member moves up and down, the movement of the swing lever is controlled by the regulating member. Each gear of the gear unit is regulated to a position where it does not mesh with each gear of the intermediary gear.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the magnetic recording and reproducing apparatus of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of essential parts showing an embodiment of the present invention. In the figure, 1 is a rotating cylinder unit equipped with a magnetic head, 2 is a motor that drives a capstan 3, 4 is a motor gear formed in the rotor of the motor 2, and 7 is a magnetic tape 5 that is wound and stored. The tape cassette 6 is a pinch roller that works with the capstan 3 to drive the magnetic tape 5. 9
1 is a supply reel stand rotatably supported on a reel spindle 12 for feeding or winding the magnetic tape 5;
0 is a reel gear integrally formed with the supply reel stand 9;
13 is a take-up reel stand which is rotatably supported on a reel spindle 16 in order to wind up or feed out the tape like the supply reel stand 9; 14 is a reel gear formed integrally with the take-up reel stand 13. . Reference numeral 17 denotes a supply side intermediate gear, in which a small diameter gear 19 is always engaged with the reel gear 10, and a large diameter gear 18 is integrally formed. Reference numeral 22 denotes a winding-side intermediary gear in which a small-diameter gear 24 always meshes with the reel gear 14 and a large-diameter gear 23 is integrally formed. 27 is a large-diameter intermediate gear that constantly meshes with the motor gear 4 and transmits the rotation of the motor 2; 28 is a small-diameter intermediate gear that is integrally formed with the intermediate gear 27 and reduces the rotation of the motor 2 to the next drive gear 29. and communicate. Reference numeral 30 denotes a swinging gear unit that is biased with a moving force in accordance with the rotation of the drive gear 29, and reference numeral 40 indicates a swinging support that rotatably holds the swinging gear unit 30 on the lower surface and serves as a center of swinging at the lower surface in the approximate center. A swinging lever with an erected shaft 44;
46 is a moving member for vertically moving the rocking lever 40 holding the rocking gear unit 30 in rotation; 47 and 48 are moving members 46 for sandwiching the rocking lever 40 from above and below while allowing some movement in the plane direction. An upper stopper and a lower stopper are integrally formed in the upper and lower stoppers, and 51 is a drive rod for vertically moving the moving member 46 (FIG. 3).
). Reference numeral 56 denotes a regulating member for regulating the swing lever 40 to a neutral position, and the regulating member pivots around a regulating member support shaft 59 and is connected to the brake rod 60 by an engaging portion 58 to rotate. 61,6
Reference numerals 3 denote brake members on the supply side and take-up side, which engage with a brake rod 60 through brake engaging portions 65 and 66, respectively, and brake the supply reel stand 9 and the take-up reel stand 13 in accordance with the movement of the brake rod 60. Braking of the reel stands 9, 13 is performed by the brake friction pieces 37 attached to the respective tips of the brake members 61, 63 by means of adhesive or the like and pressed against the cylindrical parts 11, 15 of the reels 9, 13. 62
, 64 are brake springs for applying braking force. A cam gear 53 slides the drive rod 51 and brake rod 60 through a cam groove 54 and a cam portion 55, respectively. The cam gear 53 is driven via a DC motor for driving the cam gear 53 and a gear train for deceleration and the like (not shown).

FIG. 2 is a sectional view showing details of the swing lever 40 and the swing gear unit 30. Swing gear unit 3
0 is a large-diameter first gear 31 that constantly meshes with the drive gear 29.
, a rotating base 35 to which limited rotational torque is transmitted by the friction member 33 and the pressing spring 34;
A small-diameter second gear 32 press-fitted into the first
The gear 31 and the second gear 32 have the same diameter difference as the large diameter gears 18, 23 and the small diameter gears 19, 24 of the intermediate gears 17, 22. A swing gear unit support shaft 38 is mounted on the swing lever 40 and rotatably holds the swing gear unit 30. 36 is a moving force biasing spring for generating rotational torque due to friction between the swinging gear unit 30 and the swinging lever 40 to generate a moving force in the swinging gear unit, 39 is a stop washer, and 45 is a swinging support. It is mounted on the chassis 8 with a bearing that holds the shaft 44 rotatably and movably in the axial direction.

FIG. 3 is a partial side view showing how the moving member 46 moves up and down. A drive pin 52 formed on a drive rod 51 (indicated by a broken line) engages with a cam groove 49 formed on the side surface of the moving member 46 . The moving member 46 is at the first height position close to the tape cassette 7 side when the drive rod 51 takes the position shown in FIG. 3(a), and when the drive rod 51 takes the position shown in FIG. 3(b). is chassis 8
The second height position is closer to the side. Further, the swing lever 40 and the swing lever 40 are sandwiched between an upper stopper 47 and a lower stopper 48 that are integrally formed on the moving member 46.
The swing gear unit 30 (not shown in FIG. 3), which is rotatably held by the (not shown in FIG. 3), also moves to the first height position and the second height position, respectively, in response to the movement of the moving member 46. Take a height position.

The operation of the recording/reproducing apparatus of this embodiment constructed as described above will be explained below. Figure 1
represents a plan view of a normal rotation recording/reproducing state. During normal recording and reproduction, the capstan 3 and the pinch roller 6 feed the magnetic tape 5 in the direction of arrow A at a constant low speed. The rotation of the motor gear 4, which rotates integrally with the capstan 3, is reduced in rotation speed via intermediate gears 27 and 28, and then transferred to the drive gear 29.
As a result, the drive gear rotates in the direction of arrow B. cam gear 5
3 through the drive rod 51 and the moving member 46.
The swing gear unit 30, which assumes a height position of , is connected to the drive gear 29
The rotation is transmitted to the first gear 31, which is always in mesh with the first gear 31.

Next, the friction torque generated by the moving force biasing spring 36 generates a moving force at the contact portion between the drive gear 29 and the first gear 31, and the swing gear unit 30 moves toward the winding-side intermediate gear 17. It rotates around a swing support shaft 44. At this time, the swing gear unit 30 that takes the first height position is shown in FIG.
As shown in a), the second gear 32 and the winding side intermediate gear 2
The second large diameter gear 23 meshes with the second large diameter gear 23. Since the second gear 32 is transmitted with rotational torque limited by a friction member or the like, it is transmitted to the take-up reel stand 13 via the take-up side intermediate gear 22.
The rotation of the magnetic tape 5 is limited to a constant low rotational torque, and the gear train of the swing gear unit 30 and the intermediary gear 22 decelerates the magnetic tape 5 running at a constant speed to such an extent that there is no slack, thereby winding the magnetic tape 5. . Further, the gear tooth width in the axial direction of the large diameter gear 23 of the winding-side intermediate gear 22 is set thinner than the gear tooth width of the small diameter gear 24. The engagement of the swing gear unit 30 with the winding-side intermediate gear 22 is such that the contact portion 42 provided on the swing lever 40 is connected to the intermediate gear support shaft 25.
It is maintained at an appropriate position by coming into contact with a stopper portion 26 provided at the top.

FIG. 4 shows a plan view of the reverse recording/reproducing state. The difference between the reverse recording and reproducing operation and the normal rotation is that the rotation direction of the capstan 3 is reversed, and the magnetic tape 5 runs in the direction of arrow C. Therefore, the drive gear 29 also rotates in the opposite direction of arrow D. As a result, the swing gear unit 30 rotates toward the supply-side intermediate gear 17, meshing with the supply-side intermediate gear 17 as shown in FIG. 8(b), and moving the supply reel stand 9 in the winding direction of the magnetic tape 5. Rotate. Further, similarly to the winding-side intermediate gear, the axial gear tooth width of the large-diameter gear 18 of the feed-side intermediate gear 17 is set thinner than the gear tooth width of the small-diameter gear 19. The engagement of the swing gear unit 30 with the supply-side intermediate gear 22 is similar to that during normal rotation recording and reproducing, as the contact portion 41 provided on the swing lever 40 contacts the stopper portion 21 provided on the intermediate gear support shaft 20. is kept in an appropriate position.

FIG. 5 shows a plan view in a fast forward state. In the fast forwarding state, the pinch roller 6 is separated from the capstan 3,
The magnetic tape 5 runs in the direction of arrow A only by the take-up reel stand 13. The rotation of the motor 2 is transmitted to the drive gear 29 via an intermediate gear, etc., and the drive gear 29 rotates in the direction of arrow B. The drive rod 51 and the moving member 4 are moved by the cam gear 53.
Oscillating gear unit 30 assumes a second height position via 6
The rotation is transmitted to the first gear 31 which is constantly meshed with the drive gear 29. Next, the swing gear unit 30 rotates toward the winding-side intermediate gear 17 in the same way as during normal rotation recording and reproduction. At this time, the swing gear unit 30 that takes the second height position is shown in FIG.
As shown in (c), the first gear 31 and the small diameter gear 24 of the winding-side intermediate gear 22 mesh with each other. As a result, unlike during recording and reproduction, the take-up reel stand 13 can be driven in the winding direction of the magnetic tape 5 with a large rotational torque that does not involve friction means. Further, since the rotation of the take-up reel stand 13 is not slowed down by a swing gear unit or the like at this time, the magnetic tape 5 can be wound at high speed without increasing the rotation speed of the motor 2 too much. The tooth width of the small diameter gear 24, which is thicker than the large diameter gear 23 of the winding-side intermediate gear 22, is wide enough to transmit large rotational torque when meshing with the first gear 31. It has a meshing width. The engagement of the swing gear unit 30 with the winding-side intermediate gear 22 is such that the contact portion 42 provided on the swing lever 40 engages with the stopper portion 2 provided on the intermediate gear support shaft 25, as in the case of recording and reproduction.
It is kept in an appropriate position by coming into contact with the lower side of 6.

FIG. 6 shows a plan view of the rewound state. The difference between rewinding and fast forwarding is that the rotation direction of the motor 2 is reversed, and the magnetic tape 5 is run in the direction of arrow C by the supply reel stand 9. Therefore, the drive gear 29 also rotates in the opposite direction of arrow D. As a result, the swing gear unit 30 rotates toward the supply-side intermediate gear 17, meshing with the supply-side intermediate gear 17 as shown in FIG. 8(d), and moving the supply reel stand 9 in the winding direction of the magnetic tape 5. Rotate. Similar to the winding side, the tooth width of the small diameter gear 19, which is set thicker than the large diameter gear 18 of the supply side intermediate gear 17, is designed to transmit a large rotational torque when meshing with the first gear 31. It has a wide engagement width that does not cause any problems. Supply side intermediary gear 17 of swing gear unit 30
The engagement with the contact portion 4 provided on the swing lever 40
1 comes into contact with the lower side of the stopper portion 21 provided on the intermediate gear support shaft 20, so that it is maintained at an appropriate position as in the case of recording and reproducing.

FIG. 7 shows a plan view in a stopped state. In the stopped state, the regulating part 57 of the regulating member 56 regulates the movement of the neutral position regulating part 43 provided on the swing lever 40, thereby regulating the swing so that the swing gear unit 30 does not mesh with any intermediate gear. do. Furthermore, when the swinging lever 40 is moved up and down by the moving means, it is also carried out in the swinging restricted state. At this time, since there is a slight gap between the regulating part 57 and the neutral position regulating part 43, there is no problem with the vertical movement. FIG. 8(e) shows a cross section of the gear section in a stopped state, and shows that the swing gear unit 30 is in a neutral state.

FIG. 8 shows cross-sectional views of the swing gear mechanism in various operating states. Large diameter gears 18, 2 of intermediate gears 17, 22
3 is thinner than the small diameter gears 19 and 24. This is due to the large diameter gear 18 as shown in FIGS. 8(a) and 8(b).
, 23 work only in the forward rotation recording/reproducing state or the reverse rotation recording/reproducing state, and in these states, the magnetic tape 5 is mainly fed by the capstan 2 and the pinch roller 6, so it is difficult to wind the magnetic tape 5 onto the reel stand. A low rotational torque is sufficient, and since the rotational speed is reduced by the intermediary gears 17 and 22, the rotational torque is even lower. Therefore, in the large-diameter gears 18 and 23 to which the rotational torque is transmitted from the second gear 32, the pressure on the tooth surfaces of the gears is low, and even if the axial meshing width is narrowed, sufficient rotation can be transmitted. However, Fig. 8(c),(d)
In the high-speed fast-forwarding and rewinding state shown in FIG. 3, the magnetic tape 5 is wound exclusively on the reel stand, so the rotational torque of the reel stand needs to be high enough for winding. Therefore, when the small-diameter gears 19, 24 of the intermediate gears 17, 22 engage with the first gear 31, the pressure on the tooth surfaces of the gears is high, and there is a limit to narrowing the axial engagement width.

Furthermore, in this embodiment, the swing gear unit 30
Because the swing gear unit 30 swings in a circumscribed state with respect to the drive gear 29, the swing gear unit 30 moves between the neutral position and each intermediate gear 17.
, 22, the first gear 31 and the drive gear 2
9 have different engagement depths. However, since the distance from the swing center to the first gear 31, which is the circumscribed radius, is long and the swing angle is small as seen from the plan view, the difference in meshing depth is small, and the difference in engagement depth is slightly different from that of the swing gear unit 30. The meshing can be achieved by taking simple measures such as widening the meshing center distance of the drive gear 29, reducing the tooth thickness on the arc of the gear tooth profile of the first gear 31 and the driving gear 29, or deepening the tooth bottoms. Slight differences in depth are not a problem.

As described above, according to the present embodiment, the swing gear unit 30 is connected to the supply side intermediary gear 17 or In the first height position of the swing gear unit 30, the rotation of the drive gear 29 is limited by friction means such as the friction member 33, and is sufficiently rotated. The reel stand 13 is connected to the reel stand 13 by a swinging gear mechanism that transmits the reduced rotational torque that is not reduced at the second height position of the swing gear unit to either one of the two reel stands.
. Moreover, this swing gear mechanism realizes many functions with one swing gear unit, and most of it can be placed between two reel stands, so it takes up less space in the thickness direction and plane direction of the device. It has the advantage of requiring less.

Furthermore, the center of swing of the swing lever 40 is configured at a position opposite to the drive gear 29 and does not overlap with the gears, and the swing lever 40 can be gripped from above and below at the center of swing. By providing a moving member 46 that moves up and down between the first height position and the second height position of the swing gear unit 30 using a moving means, the bearing part at the center of swing of the swing gear mechanism and The moving member does not overlap with the gears, so it does not become thick, and the force for applying the moving force to the swinging gear unit 30 is the same as that between the swinging gear unit 30 and the swinging lever 40. The force is generated by the friction torque caused by the moving force biasing spring 36 inserted between them, and the magnitude of the force is the friction torque divided by the radius of the first gear 31, which is applied to the meshing portion of the drive gear 29 and the first gear. Occur. At this time, when viewed from the swinging lever 40, a swinging force is generated in the outer part of the first gear 31 having the largest radius from the swinging center. Compared to a swing gear mechanism, even a small force generates a large swing torque. Therefore, sufficient rocking torque can be obtained without increasing the friction torque generated by the moving force biasing spring 36.

Furthermore, the swing gear unit 30 is moved to the intermediate gear 1 at the first height position and the second height position.
By providing the regulating member 56 that regulates with a slight degree of freedom in a position that does not mesh with either of the levers 7 and 22, the neutral position regulating portion 43 of the swinging lever 40 and the regulating portion are fixed when the swinging gear unit 30 moves up and down. 57, the swing gear unit 30 can move smoothly without the tips of the teeth of the intermediary gears 17, 22 coming into contact with the tips of the teeth of the swing gear unit 30. Further, the swing gear unit 30 is always in the first gear 31.
Since the teeth move up and down while meshing with the drive gear 29, there is no problem of the tips of the teeth coming into contact with each other, and even this part can be smoothly moved. Moreover, the neutral position regulating section 43 and the regulating section 57
Since the swinging is restricted with a slight degree of freedom, when the neutral position regulating part 43 moves up and down, a large frictional force is exerted between it and the regulating part 57, and the swinging is controlled without causing any damage to the vertical movement. Can be done. Furthermore, since the regulating member 56 is controlled by the brake rod 60 that controls the brake members 61 and 63, there is an advantage that no special control means is required to regulate the swinging.

Furthermore, the meshing width between the large diameter gears 18, 23 and the second gear 32 of the intermediate gears 17, 22 in this embodiment is narrower than the meshing width between the small diameter gears 19, 24 and the first gear 31. By doing so, the intermediary gear 1 has a laminated structure in order to realize high-speed rotation mode and low-speed rotation mode of the reel stand.
The axial tooth width of the large diameter gears 18 and 23 of No. 7 and 22 can be made thinner. As a result, not only can the space in that area be used effectively, but also the large diameter gears 18, 23 overlap the reel stands 9, 13, so the reel gears 10, 14 and the cylindrical parts 11, 15 for the brake (Although not shown, the cylindrical portion 11 of the supply reel stand 9 is also used as a friction surface for a band brake for tension control.) The thickness of the reel stand portion that requires this determines the thickness of the device. Since it is a major factor, its effect is large.

[0032]

As described above, the present invention includes a pair of reel stands each having a gear portion for supplying or winding tape, and a small-diameter gear that is always engaged with the gear portion of the reel stand and is integrally formed. a pair of intermediary gears having a large-diameter gear formed therein and having a diameter difference with respect to the small-diameter gear; a drive gear that rotates by being transmitted with the rotational force of a motor that drives the capstan; and a drive gear that is constantly meshed with the drive gear. a large-diameter first gear that rotates, and a small-diameter gear that has the same diameter difference as the large and small gears of the intermediary gear and concentrically transmits rotational torque limited by a friction means to the first gear. a swinging gear unit that is made up of two gears and is biased with a moving force according to the rotational direction of the drive gear, and a large diameter gear of the intermediate gear and a second gear of the swinging gear unit can mesh with each other. At the first height position of the oscillating gear unit, rotational torque that is limited depending on the rotational direction of the drive gear is transmitted to either one of the reel stands, and the small diameter gear of the intermediate gear and the oscillating At the second height position of the rocking gear unit in which the first gear of the gear unit can engage, the rotational torque that is not limited by the friction means is applied to either one of the reel stands depending on the rotational direction of the drive gear. With a swing gear mechanism that transmits data to the reel, it has a very simple configuration that allows the reel stand to operate in four modes: the low-speed rotation mode of recording/reproduction and reverse playback functions, and the high-speed rotation mode of high-speed fast forward and rewind. Moreover, this oscillating gear mechanism realizes four modes with one oscillating gear unit, and most of it can be placed between two reel stands, making the equipment smaller and thinner. It has the advantage of being inexpensive and highly reliable because it has fewer components.

[0033] In addition, a swinging device having a swinging center at a position opposite to the driving gear and not overlapping with the gears in a plane and rotatably holding the swinging gear unit at an end thereof; a lever; and a moving member that moves the swinging gear unit up and down between a first height position and a second height position by a moving means while gripping the swinging lever from above and below at the swinging center. As a result, the bearing portion at the center of the swing of the swing gear mechanism and the moving member for vertical movement do not overlap with the gears, so they do not become thick, thereby making it possible to downsize the device. In addition, sufficient swinging torque can be obtained without using a large friction torque for energizing the moving force, so there is no need for a large Hiroi area or thickness in the structure of the friction means, and there is no need to increase the load on the motor. Since the friction torque is small, there is little power loss, and there is no need to increase the size of the motor itself.

In addition, the swinging gear unit is restricted to swing with a slight degree of freedom to a position where it does not mesh with either of the intermediate gears at its first height position and second height position. The provision of a regulating member allows the swing gear unit to move up and down smoothly, and is highly reliable as there is no damage to the tips of the gear teeth, and there is no contact between the tips of the teeth during switching. It has the advantages of being quiet and high quality.

[0035] Further, an axial meshing width between the large diameter gear of the pair of intermediary gears and the second gear of the swing gear unit is such that the width of engagement in the axial direction of the large diameter gear of the pair of intermediary gears is equal to that of the small diameter gear of the pair of intermediary gears and the second gear of the swing gear unit. By making it narrower than the axial meshing width of the first gear, the large diameter gear of the intermediary gear, which has a laminated structure, can be made thinner to realize high-speed rotation mode and low-speed rotation mode of the reel stand. Since important space in the vicinity can be used effectively, equipment can be downsized.

[Brief explanation of drawings]

[Fig. 1] A plan view of main parts showing the recording and reproducing state of the device of the present invention during normal rotation.

[Fig. 2] A cross-sectional view centered on the swing gear unit of the device of the present invention.

FIG. 3 is a partial side view showing how the moving member of the device of the present invention moves up and down.

[Fig. 4] A plan view of the main part showing the recording and reproducing state when the device of the present invention is reversed.

[Fig. 5] A plan view of the main parts showing the fast-forwarding state of the device of the present invention.

[
FIG. 6: A plan view of the main parts showing the unwinding state of the device of the present invention

[Fig. 7] A plan view of the main parts showing the stopped state of the device of the present invention.

[Figure 8]
Cross-sectional views of the swing gear mechanism of the device of the present invention in various operating states

[Explanation of symbols]

2 Motor 9 Supply reel stand 13 Take-up reel stand 17 Supply side intermediary gear 18 Large diameter gear 19 Small diameter gear 22 Winding side intermediate gear 23 Large diameter gear 24 Small diameter gear 27 Intermediate gear 29 Drive gear 30 Swing gear unit 33 Friction member 40 Swing lever 43 Neutral position regulation part

Claims (4)

[Claims] 1. A pair of reel stands each having a gear portion for supplying or winding tape, and a large diameter portion gear integrally formed with a small diameter portion gear that constantly meshes with the gear portion of the reel stand. a pair of intermediary gears, a drive gear that drives the capstan, a large-diameter first gear that rotates while constantly meshing with the drive gear, and a rotating torque limited by a friction means from the first gear that is concentric with the drive gear that drives the capstan; a small-diameter second gear to which the drive gear is transmitted, and a swing gear unit that is biased with a moving force according to the rotational direction of the drive gear;
A first gear of the swing gear unit in which a large diameter gear of the intermediate gear and a second gear of the swing gear unit can mesh with each other.
At the height position, rotational torque limited according to the rotational direction of the drive gear is transmitted to either one of the reel stands, and the small diameter gear of the intermediate gear and the first
At a second height position of the rocking gear unit in which the gears of the gears can mesh with each other, a magnetic recording device transmits a rotational torque that is not limited by the friction means to one of the reel stands according to the rotational direction of the drive gear. playback device. 2. A pair of reel stands each having a gear portion for supplying or winding the tape, and a small diameter gear constantly meshing with the gear portion of the reel stand, and integrally formed with the gear portion of the reel stand; a pair of intermediary gears each having a large-diameter gear with a diameter difference; a drive gear that rotates by being transmitted with the rotational force of the motor; a large-diameter first gear that rotates in constant mesh with the drive gear; a second gear with a small diameter having the same diameter difference as the large and small gears of the intermediate gear and concentrically transmitting rotational torque limited by a friction means in the rotational direction of the drive gear; a first height position of the swing gear unit at which the large-diameter gear of the intermediary gear and the second gear of the swing gear unit can mesh with each other; Then, the rotational torque limited according to the rotational direction of the drive gear is transmitted to either one of the reel stands, and the small-diameter gear of the intermediate gear and the first gear of the swing gear unit can mesh with each other. At a second height position of the moving gear unit, a swing gear mechanism transmits a rotational torque not limited by the friction means to either one of the reel stands according to the rotational direction of the drive gear; is on the opposite side and has a swing center at a position that does not overlap with the gears in a plane, and rotatably holds the swing gear unit at the end; A magnetic recording and reproducing device comprising a moving member that moves the swing gear unit up and down between a first height position and a second height position using a moving means while gripping the swing gear unit from above and below at the center. 3. A regulating member that restricts the swinging of the swinging gear unit to a position where the swinging gear unit does not mesh with either of the intermediate gears at the first height position and the second height position, with a slight degree of freedom. 3. The magnetic recording and reproducing apparatus according to claim 2, comprising: 4. An axial meshing width between the large diameter gear of the pair of intermediary gears and the second gear of the swing gear unit is such that the width of engagement in the axial direction of the large diameter gear of the pair of intermediary gears and the second gear of the swing gear unit is equal to 4. The magnetic recording and reproducing device according to claim 3, wherein the width is narrower than the axial meshing width of the first gear.