JPH10106068A - Magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic recording/reproducing device in which each engaging teeth part is deviated from engagement with each other when the rotating force is transmitted by engaging the engaging teeth parts of a rotation force transmitting member each other. SOLUTION: A direct connection mechanism for transmitting the rotating force of a driving source to a supply reel base or a take-up reel base in the direct connection state is composed of a center pulley 13 and an output gear 21, and the plural engaging teeth parts 13a, 13b, 21b are projectingly formed respectively in the direction approaching each other from the surfaces of these center pulley 13 and output gear 21 confronted each other so that the engaging teeth parts 13a, 13b, 21b are freely engaged each other, then the projecting height of one engaging teeth part 13b among the engaging teeth parts 13a, 13b of the center pulley 13 is formed lower than that of another engaging teeth part 13a, thereby the deviated engagement of the engaging teeth parts 13a, 13b, 21b with each other is prevented.

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 in which a reel stand is driven by a capstan motor for driving a capstan.

[0002]

2. Description of the Related Art As a magnetic recording / reproducing apparatus in which a reel stand is also driven by a capstan motor for driving a capstan, the present applicant has proposed the one shown in FIGS.

In this magnetic recording / reproducing apparatus, as shown in FIGS. 7 to 10, a rotary head 2 having a magnetic head (not shown) for recording and reproducing on and from a magnetic tape 1, and a magnetic tape 1 wound around Supply reel base 3 and take-up reel base 4 on which supply reels and take-up reels are mounted, respectively;
A capstan 6 for moving the magnetic tape 1 in cooperation with the pinch roller 5, a drive motor 7 for driving the capstan 6, and a pinch for bringing the pinch roller 5 into contact with and separating from the capstan 6 via the magnetic tape 1. Rotational lever 8 serving as a roller moving unit, and a rotation that can be switched between a clutch transmission mode in which the torque of the capstan 6 is transmitted through clutch means described later and a direct connection mode in which the torque of the capstan 6 is directly transmitted. The force switching transmission means 9 and the torque from the torque switching transmission means 9 are transmitted to the capstan 6.
And a reel base selecting means 10 for selectively transmitting to the supply reel base 3 and the take-up reel base 4 according to the rotation direction of the reel base.

More specifically, as shown in FIGS. 7 to 16, a drive motor 7 rotates a capstan tree 11 coaxial with the capstan 6, and the rotational driving force is applied to the belt
2, the power is transmitted to a center pulley 13 rotatably disposed below an intermediate position between the supply reel table 3 and the take-up reel table 4. On the lower surface side of the center pulley 13, a clutch plate 15 having a felt 14 (see FIG. 13) attached to the upper surface is arranged, and on the upper surface side of the center pulley 13, a rotation engaging member 16 is arranged. The shaft of the clutch plate 15 is the center pulley 1
3, the clutch plate 15 and the rotation engaging member 16 are freely movable in the axial direction with respect to the center pulley 13. ing. Then, a first compression spring 17 is interposed between the rotation engagement member 16 and the center pulley 13, and the first compression spring 17
Is pressed against the center pulley 13 via the felt 14.

The shaft of the rotation engaging member 16 is rotatably supported by a support shaft 19 attached to a chassis 18, and a spacer 20 is provided above the shaft of the rotation engagement member 16 on the support shaft 19. An output gear 21 is provided.
The output gear 21 is supported so as to be axially movable with respect to the rotation engagement member 16 in a state of being fitted to the rotation engagement member 16, and is interposed between the output gear 21 and the rotation engagement member 16. The output gear 21 is urged by the mounted second compression spring 22 (see FIG. 13) in a direction away from the rotation engagement member 16. Further, the rotation engaging member 16 is formed with four convex portions 16a that protrude in the circumferential direction, and the convex portions 16a are engaged with concave portions 21a formed on the output gear 21. The gear 21 is configured to rotate integrally.

Further, the output gear 21 is formed with a large number of engaging teeth 21b projecting downward at appropriate intervals, and a center pulley is provided so as to face the engaging teeth 21b of the output gear 21. 13 on the upper surface of the circumferential direction
The engaging tooth portion 13a is formed to protrude at a location,
Above the output gear 21, there is provided an elevating lever 23 capable of pushing the output gear 21 downward.

By lowering the elevating lever 23 against the urging force of the second compression spring 22, the engaging teeth 21b of the output gear 21 are brought into engagement with the center pulley 13 as shown in FIG. A direct connection mode in which the rotational force of the center pulley 13 is directly transmitted to the output gear 21 by meshing with the teeth 13a can be provided. That is, a direct coupling mechanism is formed by the engaging teeth 21b of the output gear 21 and the engaging teeth 13a of the center pulley 13, the center pulley 13 functions as a drive-side rotating member, and the output gear 21 is driven by a driven-side rotating member. Function as

Here, the engaging teeth 21b of the output gear 21
The engaging tooth portion 13a of the center pulley 13 is formed into a shape with a sharpened tip at each part, and the two engaging tooth portions 13a of the center pulley 13 are formed.
a is arranged at the target position, and its height H0 is formed identically as shown in FIG.

On the other hand, when no downward force is applied to the lifting lever 23, the engaging teeth 21b of the output gear 21 and the engaging teeth 13a of the center pulley 13 do not mesh as shown in FIG. In this state, the rotational force of the center pulley 13 is transmitted to the clutch plate 15 and the rotational engagement member 16 by the frictional force of the felt 14, and then transmitted from the rotational engagement member 16 to the output gear 21.
That is, in this case, the felt 14, the clutch plate 15
The clutch transmission mode is such that the rotational force is transmitted to the output gear 21 via clutch means including the rotary engagement member 16.

As shown in FIG. 15, an upper small gear portion 21c and a lower large gear portion 2 are provided above the output gear 21.
1d are formed in close contact with each other. 7 to 10
As shown in FIG. 5, a substantially fan-shaped swing arm 24 is interposed between the output gear 21 and the chassis 18 so as to be swingable. A take-up reel intermediate gear 26 is rotatably supported. The intermediate gear 25 for the supply reel and the intermediate gear 26 for the take-up reel have small teeth 25a, 26a and large teeth 25b which can mesh with the small gear 21c and the large gear 21d of the output gear 21, respectively. , 26b are integrally formed at intervals. When the output gear 21 is depressed by the lifting lever 23, FIG.
2, the large gear portion 21d of the output gear 21, the intermediate gear 25 for the supply reel, and the intermediate gear 2 for the take-up reel.
6 are meshed with the large tooth portions 25b and 26b, and the output gear 2
1 is not pressed down, as shown in FIG. 11, the small gear portion 21c of the output gear 21, the small tooth portions 25a and 26a of the supply reel intermediate gear 25 and the take-up reel intermediate gear 26, and Are designed to engage.

When the swing arm 24 swings toward the supply reel 3, the large teeth 25 b of the supply reel intermediate gear 25 mesh with the teeth 3 a formed below the supply reel 3. When the swing arm 24 is swung toward the take-up reel 4, the large tooth portion 26b of the take-up reel intermediate gear 26
Are engaged with the teeth 4a formed at the lower portion of the take-up reel 4.

Therefore, at the time of reproduction, as shown in FIG. 7, while the magnetic tape 1 is pressed against the capstan 6 by the pinch roller 5, the capstan 6 and the cap stampy 11 are rotated in the direction a, and the magnetic tape 1 is rotated. 1
And the center pulley 13 is rotated via the belt 12 in the direction c. The lifting lever 2
3, the output gear 21 is held at the upper position by the urging force of the second compression spring 22 so that the engaging teeth 21b of the center pulley 13 It is held in a state where it is not meshed with the engaging teeth 13a. Since the clutch plate 15 is pressed via the felt 14 by the biasing force of the first compression spring 17, the clutch plate 15 can slide when an external force larger than the frictional force of the felt 14 is applied. The rotational force of the center pulley 13 is transmitted to the clutch plate 15 and the rotation engaging member 16.

The rotational force transmitted to the rotation engaging member 16 is transmitted to the output gear 21 by the engagement between the convex portion 16a and the concave portion 21a of the output gear 21, and the small gear portion of the output gear 21 at the upper position. The intermediate gear 25 for the supply reel and the intermediate gear 26 for the take-up reel engage in the d direction and the e direction via the large tooth portions 25b, 26b of the intermediate gear 25 for the supply reel and the intermediate gear 26 for the take-up reel meshed with 21c. At a relatively low speed.

Since the output gear 21 is also rotated in the direction c along with the center pulley 13, the swing gear supporting the supply reel intermediate gear 25 and the take-up reel intermediate gear 26 meshing with the output gear 21 is supported. The moving arm 24 swings in a direction approaching the take-up reel table 4 as shown in FIG. 7, whereby the take-up reel table 4 is compared via the take-up reel intermediate gear 26 in the clutch transmission mode. Very low speed
Rotated in the direction. At this time, the rotation peripheral speed of the take-up reel table 4 is set so that the magnetic tape 1 at the position of the capstan 6 does not slack from the position of the capstan 6.
Is set to be slightly higher than the transfer speed.

On the other hand, at the time of reverse reproduction, as shown in FIG.
While the magnetic tape 1 is pressed against the capstan 6 by the pinch roller 5, the capstan 6 and the cap stampy 11 are rotated in the direction g to move the magnetic tape 1 to h.
The center pulley 13 is rotated in the i direction via the belt 12 while being sent in the direction. Further, the lifting lever 23 is set at the upper position as shown in FIG. 11, and the output gear 21 is accordingly held at the upper position and the engaging teeth 2
1b is held so as not to mesh with the engaging teeth 13a of the center pulley 13. And felt 14
And the center pulley 13 via the clutch plate 15
Is transmitted to the clutch plate 15 and the rotation engaging member 16 and also to the output gear 21, and the supply reel intermediate gear 25 and the winding gear meshing with the small gear portion 21c of the output gear 21 at the upper position. Intermediate gear for reel 26
The intermediate gear 25 for the supply reel and the intermediate gear 26 for the take-up reel are rotated at relatively low speeds in the j and k directions via the large tooth portions 25b and 26b.

Since the output gear 21 is also rotated in the i-direction along with the center pulley 13, the swing arm 24
8, as shown in FIG. 8, swings in a direction approaching the supply reel base 3, whereby the supply reel base 3 is moved in the clutch transmission mode at a relatively low speed in the m direction via the supply reel intermediate gear 25. Is rotated. At this time, the rotational peripheral speed of the supply reel base 3 also depends on the magnetic tape 1 at the position of the capstan 6.
Is set to be slightly higher than the transfer speed.

When high-speed reproduction or high-speed reverse reproduction is performed, the capstan 6 is rotated at a slightly higher speed in the same state as described above. At the time of rapid traverse, as shown in FIG.
Is moved away from the capstan 6, the capstan 6 and the cap stampy 11 are rotated at high speed in the direction a, and the center pulley 13 is rotated via the belt 12 in the direction c. The elevating lever 23 is lowered to the lower position as shown in FIG.
1 is held down in a direct connection state (direct connection mode) in which the engaging teeth 21b are engaged with the engaging teeth 13a of the center pulley 13, and the rotational force of the center pulley 13 is reduced by the output gear 21. Directly transmitted to

Since the output gear 21 is located at the lower position, the small gear 2 of the intermediate gear 25 for the supply reel and the intermediate gear 26 for the take-up reel are attached to the large gear portion 21d of the output gear 21.
5a and 26a mesh with each other, whereby the supply reel intermediate gear 25 and the take-up reel intermediate gear 26 are rotated at higher speeds in the d and e directions. Since the output gear 21 is also rotated in the direction c along with the center pulley 13, the swing arm 24 swings in a direction approaching the take-up reel table 4, as shown in FIG. The take-up reel base 4 is rotated at a high speed in the f-direction in the direct connection mode via the take-up reel intermediate gear 26, and as a result, the magnetic tape 1 is fed at a high speed in the b-direction.

At the time of rewinding, as shown in FIG. 10, the capstan 6 and the cap stampy 11 are rotated at a high speed in the g direction while the pinch roller 5 is separated from the capstan 6, and Center pulley 1
3 is rotated in the i direction. The lifting lever 23 is shown in FIG.
As shown in FIG. 2, the output gear 21 is lowered to the lower position.
1b is held in a direct connection state (direct connection mode) in which the engagement tooth portion 13a of the center pulley 13 is engaged, and the rotational force of the center pulley 13 is directly transmitted to the output gear 21.

Since the output gear 21 is located at the lower position, the small gear 2 of the supply gear intermediate gear 25 and the take-up reel intermediate gear 26 is attached to the large gear portion 21d of the output gear 21.
5a and 26a mesh with each other, whereby the supply reel intermediate gear 25 and the take-up reel intermediate gear 26 are rotated at higher speeds in the j and k directions. Further, since the output gear 21 is also rotated in the i direction along with the center pulley 13, the swing arm 24 swings in a direction approaching the supply reel table 3 as shown in FIG. The supply reel base 3 is rotated at a high speed in the m direction in the direct connection mode via the intermediate gear 25 for the reel, and as a result, the magnetic tape 1 is fed at a high speed in the g direction.

[0021]

However, in the magnetic recording / reproducing apparatus having the above-described structure, when the elevating lever 23 is lowered and the output gear 21 is pushed down to the lower position, the output gear 21 is engaged. Since the teeth 21b are formed of resin, they are bent due to aging or the like, and the
As shown in (1), the engaging teeth 21b of the output gear 21 may bend in the directions facing each other in the radial direction of the output gear 21, and a displacement may occur. Then, the engaging teeth 21b of the output gear 21 are connected to the center pulley 13
12 may move along the inclined surface of the distal end portion of the engaging tooth portion 13a and mesh with each other, and the engaging tooth portion 21b of the output gear 21 may not be lowered to a normal position as shown in FIG. .

Further, when the output gear 21 is pushed down to the lower position, the distal end of the engaging tooth portion 21b of the output gear 21 and the distal end of the engaging tooth portion 13a of the center pulley 13 come into contact with each other. In this case, the tips of the two engaging teeth 13a of the center pulley 13 and the tips of the engaging teeth 21b of the output gear 21 come into contact almost simultaneously at two places. The teeth 13a may mesh with each other along the inclined surface on the opposite side of the tip portion.
1b may not be able to descend to the normal position as shown in FIG.

The present invention solves the above-mentioned problem, and when engaging the engaging teeth of the members for transmitting the rotational force to transmit the rotational force, the engaging teeth are displaced and engaged with each other. It is an object of the present invention to provide a magnetic recording / reproducing apparatus without any problem.

[0024]

In order to solve the above-mentioned problems, the present invention provides a supply reel table and a take-up reel table on which a supply reel and a take-up reel around which a magnetic tape is wound, respectively. A rotational force switching transmitting means capable of switching between a clutch transmitting mode in which the rotational force of the drive source is transmitted via the clutch means and a direct coupling mode in which the rotational force of the capstan is directly coupled and transmitted by a direct coupling mechanism; A magnetic recording / reproducing apparatus comprising: reel unit selecting means for selectively transmitting the rotational force from the means to the supply reel table and the take-up reel table in accordance with the rotation direction of the drive source. The direct coupling mechanism of the rotational force switching transmission means is constituted by a driving side rotating member and a driven side rotating member which are arranged so as to be close to and releasable from each other. A plurality of engaging teeth are formed to project from each other in a direction approaching each other from the opposing surfaces of the member so that the engaging teeth can freely engage with each other. The projection height of the remaining engaging teeth is made lower than the two engaging teeth.

This prevents the engaging teeth from shifting and meshing with each other when transmitting the rotational force by engaging the engaging teeth of the members for transmitting the rotational force.

[0026]

DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, there is provided a supply reel table and a take-up reel table on which a supply reel and a take-up reel on which a magnetic tape is wound, respectively, and a driving source. A torque transmission transmitting means capable of switching between a clutch transmission mode for transmitting the rotational force of the capstan via a clutch means and a direct coupling mode for directly transmitting and transmitting the rotational force of the capstan by a direct coupling mechanism; and And a reel table selecting means for selectively transmitting the rotational force of the drive source to the supply reel table and the take-up reel table in accordance with the rotation direction of the drive source. The direct coupling mechanism of the switching transmission means is constituted by a driving-side rotating member and a driven-side rotating member which are arranged so as to be approachable and detachable from each other, and the driving-side rotating member and the driven-side rotating member are mutually connected. A plurality of engaging teeth are formed so as to project from each other in a direction approaching each other from the opposing surfaces so that the engaging teeth can freely engage with each other, and one of the rotating members is engaged with one of the engaging teeth. The projecting height of the remaining engaging tooth portion is formed lower than the tooth portion,
When the driving side rotating member and the driven side rotating member are directly connected to each other, the engaging tooth portion having a high protruding height of one of the rotating members is engaged with the other rotating member prior to the engaging tooth portion having a low protruding height. When the engaging tooth portion of the other rotating member abuts on the engaging tooth portion having a high protruding height, the rotating members are circumferentially relative to each other at a regular meshing position because the engaging tooth portion abuts on the engaging tooth portion. After that, the engaging teeth having a low protruding height mesh with the engaging teeth of the other rotating member, and as a result, the engaging teeth are prevented from shifting and meshing with each other.

According to a second aspect of the present invention, the engaging tooth portion having a low protruding height has a tip portion formed flat, and according to this, the driving side rotating member and At the time of direct connection with the driven-side rotating member, due to an error in the assembling position of the driving-side rotating member or the driven-side rotating member or a product dimensional error, the engaging tooth portion having a high protruding height becomes the engaging tooth portion of the other rotating member. Almost simultaneously with the contact, even if the engaging tooth portion having a low protruding height abuts the engaging tooth portion of the other rotating member, even if the engaging tooth portion has a low protruding height, When the engaging tooth portion of the other rotating member abuts on the flat portion, no force acts in the circumferential direction between the rotating members, and the engaging tooth portion having a high protruding height is used for engaging the other rotating member. When the teeth come into contact with each other and mesh with each other, the rotating members move in the circumferential direction only from this point of contact. Relatively moved by receiving, after this,
The engaging tooth portion having a low protruding height meshes with the engaging tooth portion of the other rotating member without causing a positional shift.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Only different points from the magnetic recording device proposed conventionally will be described, and the portions having the same functions will be denoted by the same reference numerals and description thereof will be omitted.

As shown in FIGS. 1 and 2, in this magnetic recording apparatus, the projecting height H1 of one engaging tooth 13b of the center pulley 13 functioning as a driving-side rotating member.
Is formed lower than the protruding height H0 of the other engaging tooth portion 13a. In addition, these engagement teeth 13a, 13
Each of the tip portions b has a triangular shape and has inclined surfaces on both sides.

With this configuration, when the lifting lever 23 is lowered and the center pulley 13 as the driving side rotating member and the output gear 21 as the driven side rotating member are directly connected,
And when the engagement tooth portion 21b of the output gear 21 and the engagement tooth portion 13a of the center pulley 13 are in the opposite position,
The engagement tooth portion 13a of the center pulley 13 having a high protrusion height contacts the engagement tooth portion 21b of the output gear 21 before the engagement tooth portion 13b of a low protrusion height. When the engaging tooth portion 21b of the output gear 21 comes into contact with the engaging tooth portion 13a having a high protruding height, the output gear 21 is normally aligned with the center pulley 13 along the inclined surface at the tip end. , And descends while moving in the circumferential direction until the meshing position is reached. Thereafter, the engaging teeth 13 b having a low protruding height are engaged with the engaging teeth 2 of the output gear 21.
Meshes with 1b. Thereby, the teeth 13a, 13b for engagement of the center pulley 13 and the output gear 21 at the time of direct connection,
21b are prevented from shifting and meshing with each other,
As a result, the output gear 21 does not stop rotating at the time of direct connection.

Further, the engaging teeth 21b of the output gear 21
Is formed of resin, it is bent due to aging or the like, and as shown in FIG. 3, the engaging teeth 21b of the output gear 21 bend in the directions facing each other in the radial direction of the output gear 21, resulting in misalignment. Also occurs, the engaging tooth portion 13a of the center pulley 13 having a high protruding height is higher than the engaging tooth portion 13b of the output gear 21 before the engaging tooth portion 13b having a low protruding height. Will be in contact. Then, at the time when the engaging tooth portion 21b of the output gear 21 abuts on the engaging tooth portion 13a having a high protruding height, as shown in FIG. As a result, the engaging tooth portion 21b of the output gear 21 is positioned on the right side of the center pulley 13 in FIG. When oriented, the engaging tooth portion 21 of the other output gear 21
4b is directed to the right side on the paper surface of FIG. 4 with respect to the tip of the engaging teeth 13b having a low protruding height, and the engaging teeth 21b of the two output gears 21 have the protruding height. High engaging teeth 13a, low engaging teeth 1
3b, and the output gear 21 descends while rotating in the circumferential direction until the output gear 21 is brought into a regular meshing position with the center pulley 13. Thereafter, the engaging teeth 13b having a low protruding height mesh with the engaging teeth 21b of the output gear 21. This prevents the engaging teeth 13a, 13b, 21b between the center pulley 13 and the output gear 21 from slipping and meshing with each other when the engaging teeth 21b of the output gear 21 are directly deformed. As a result, the output gear 21 does not stop rotating at the time of direct connection.

FIGS. 5 and 6 relate to another embodiment of the present invention. In this magnetic recording apparatus, one engagement tooth 13c of a center pulley 13 functioning as a driving-side rotating member projects. The height H2 is the other engaging tooth 1
Not only is the protrusion 3a formed to be lower than the protruding height H0, but also the tip of the engaging tooth portion 13c having a low protruded height is formed flat. Note that the engaging teeth 13 having a high protruding height are used.
The tip end of a has a triangular shape and has inclined surfaces on both sides.

That is, in the structure shown in FIGS. 1 and 2, the engaging tooth portions 13a, 13a of the center pulley 13 are provided.
Despite the fact that b is manufactured with a different height, the positional relationship and posture between the center pulley 13 and the support shaft 19 are deviated due to a slight gap between the center pulley 13 and the support shaft 19, Output gear 21, spacer 20, and support shaft 19
Between the output gear 21 and the support shaft 19
The center pulley 13 has a high protruding height when the engagement gear 13a is directly connected to the output gear 21 when the members are directly connected to each other due to a positional relationship or posture deviation from the product, or a product dimensional error of these members overlaps.
Almost simultaneously with the contact with the engagement tooth portion 21b, the engagement tooth portion 13b having a low protruding height is brought into contact with the engagement tooth portion 2 of the output gear 21.
1b.

However, according to this magnetic recording apparatus, since the flat surface 13d is formed at the tip of the engaging tooth portion 13c having a low protruding height, the center pulley 13 has a high protruding height when directly connected. The combined tooth portion 13a is the output gear 2
Almost simultaneously with contact with the first engaging tooth portion 21b, even when the engaging tooth portion 13c having a low protruding height comes into contact with the engaging tooth portion 21b of the output gear 21, even if the
The engagement tooth portion 21b has a low protruding height.
No force is applied in the circumferential direction. Then, the engaging teeth 2 of the output gear 21 are attached to the engaging teeth 13a having a high protruding height.
1b comes into contact with the center pulley 13 and descends while moving in the circumferential direction until the output gear 21 reaches a regular meshing position with the center pulley 13 along the inclined surface at the tip end thereof. Is engaged with the engaging tooth portion 21b of the output gear 21. Accordingly, it is possible to more reliably prevent the engaging teeth 13a, 13c, 21b of the center pulley 13 and the output gear 21 from shifting and meshing with each other at the time of the direct connection, and as a result, the output gear 21 does not rotate at the time of the direct connection. I do not even do.

In these embodiments, the engaging teeth 13a, 13b, 13
The case where c is formed at two places has been described, but three or more engaging teeth are formed, and the protruding height of the remaining engaging teeth is formed lower than one of the engaging teeth. May be. Also, a large number of engaging teeth are formed on the side of the driving side rotating member such as the center pulley 13, and two or more engaging teeth are formed on the side of the driven side rotating member such as the output gear 21. It is also possible to form them differently.

[0036]

As described above, according to the present invention, the protruding height of the remaining engaging teeth of one of the engaging teeth of the rotating member to be directly connected is made lower than that of one of the engaging teeth. The formation prevents the engaging teeth of the rotating members from shifting and meshing with each other at the time of direct connection, and as a result, the reliability of the directly connected portion is improved.

Further, by forming the tip end of the engaging tooth portion having a low protruding height flat, it is ensured that the engaging tooth portions of the rotating members are displaced and mesh with each other when directly connected. As a result, the reliability of the directly connected portion is further improved.

[Brief description of the drawings]

FIG. 1 is a side view of a main part of a magnetic recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a side view of a center pulley of the magnetic recording / reproducing apparatus according to the embodiment.

FIG. 3 is a side view of a main part of a center pulley and an output gear of the magnetic recording / reproducing apparatus.

FIG. 4 is a side view of a main part of a center pulley and an output gear of the magnetic recording / reproducing apparatus.

FIG. 5 is a main part side view of a magnetic recording / reproducing apparatus according to a second embodiment of the present invention.

FIG. 6 is a side view of a center pulley of the magnetic recording / reproducing apparatus according to the embodiment.

FIG. 7 is a plan view of a main part during reproduction of the magnetic recording / reproducing apparatus.

FIG. 8 is a plan view of a main part of the magnetic recording / reproducing apparatus during reverse reproduction.

FIG. 9 is a plan view of a main part of the magnetic recording / reproducing apparatus during fast forward.

FIG. 10 is a plan view of a main part of the magnetic recording / reproducing apparatus during rewinding.

FIG. 11 is a side view of a main part of a conventional magnetic recording / reproducing apparatus in a clutch transmission mode.

FIG. 12 is a side view of a main part of a conventional magnetic recording / reproducing apparatus in a direct connection mode.

FIG. 13 is a side sectional view of a main part of a conventional magnetic recording / reproducing apparatus.

FIG. 14 is a plan view of a rotation engagement member of the magnetic recording / reproducing apparatus.

FIG. 15 is a side view of a rotation engaging member of the magnetic recording / reproducing apparatus.

FIG. 16 is a bottom view of the rotation engagement member of the magnetic recording / reproducing apparatus.

FIG. 17 is a main part side view of a center pulley and an output gear in a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 12 Belt 13 Center pulley (driving-side rotating member) 13a, 13b, 13c Engaging tooth portion 15 Clutch plate 19 Support shaft 21 Output gear (driven-side rotating member) 21a Recess 21b Engaging tooth portion 23 Elevating lever 24 Swing arm 25 Intermediate gear for supply reel 26 Intermediate gear for take-up reel

Claims (2)

[Claims] 1. A supply reel base and a take-up reel base on which a supply reel and a take-up reel on which a magnetic tape is wound, respectively, and a clutch transmission mode for transmitting a rotational force of a drive source via clutch means. And a direct connection mode in which the rotational force of the capstan is directly coupled and transmitted by a direct coupling mechanism, and a rotational force switching transmitting means that can be switched to a direct coupling mode. The rotational force from the rotational force switching transmitting means is changed according to the rotational direction of the drive source. What is claimed is: 1. A magnetic recording / reproducing apparatus comprising: a reel stand selecting means for selectively transmitting a signal to a supply reel table and a take-up reel table. The driving-side rotating member and the driven-side rotating member are arranged so that the driving-side rotating member and the driven-side rotating member have a plurality Are formed so as to protrude from each other so that the engaging teeth can be freely engaged with each other, and the engaging teeth of one of the rotating members are set to the remaining engaging teeth than the one of the engaging teeth. A magnetic recording / reproducing apparatus having a low protrusion height. 2. The magnetic recording / reproducing apparatus according to claim 1, wherein the engaging tooth portion having a low protruding height has a flat end portion.