JP2880367B2 - Gear type power transmission device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear type power transmission device used for a recording / reproducing device such as a tape recorder.

[0002]

2. Description of the Related Art In a tape recorder, a winding reel or a supply is provided.
A gear type power transmission as means for driving the reel to rotate.
Is often used. This type of power transmission device is used for motors.
Take-up reel supply or supply from drive gear driven by
Selectively connect or cut off the rotation transmission path to the reel receiver
Or something to do.

[0003] A driven gear is wound on a take-up reel receiver or a supply reel.
-Directly or indirectly maintain engagement with
In the state of being engaged with the rotating drive gear,
When separated, usually the drive gear and the driven gear
The driven gear is moved along a line connecting the centers of the driven gears.

[0004]

However, the driven gear has
Connect the movement trajectory almost to the center of each of the drive gear and the driven gear
Drive gear, follower to set to match the line
The positional relationship between the gear and another gear that always meshes with the driven gear
Restricted, difficult to design or miniaturize
May occur.

[0005] Escaping such restrictions, the movement of the driven gear
The trajectory is driven at the mesh point between the drive gear and the driven gear.
If the gear is set almost coincident with the tangential direction of the gear,
When the car meshes with the drive gear,
It can be moved in the direction
If you try to move the driving gear in the opposite direction,
Because it will be against the direction of rotation, the rotational load
Large operation to release the meshing example in a state in which There has been an action
It will take power. In addition, instant engagement is possible
Even if it is inevitable that there is no
Not be able to do so, resulting in a heavy load on both gears
There was also a problem.

An object of the present invention is to provide a drive gear and a driven gear.
Nearly coincident with the tangential direction of the drive gear at the mesh point
Move the driven gear in the direction
Driven gear in a gear type power transmission device
The drive gear meshing and meshing release are all circular.
The purpose is to enable smooth and instantaneous operation. Of the present invention
Another purpose is to move the driven gear during disengagement.
Gear type motion that does not require a wide space and is suitable for downsizing of equipment
It is to provide a force transmission device.

[0007]

Means for Solving the Problems To achieve the above objects,
According to the first aspect of the present invention, a gear type power transmission device
To engage the dynamic gear, the driven gear is driven by the engagement means.
By moving in the direction of car rotation, meshing
Release is performed by pressing the driven gear in the tooth width direction by the release means.
And then by the return means, the driven gear
Is returned to the disengagement position before the engagement.

According to a second aspect of the present invention, there is provided a driven gear according to the first aspect.
Made of elastically deformable synthetic resin, meshing with driven gear
Press the vicinity of the part in the tooth width direction with the above-mentioned release means to bend it.
You.

Further, the device according to claim 3 is an elastically deformable slave.
The gear supporting member that supports the moving gear, the driven gear is the driving gear
With a biasing force in a direction to
The driven tooth is pressed by pressing the gear support member with meshing means.
The wheel shall be meshed with the drive gear, and the release means shall be a meshing hand.
The gear is provided integrally with the step, and the meshing means pushes against the gear support member.
In response to the operation of releasing pressure and returning, the release means
It is configured to press the meshing portion of the vehicle.

[0010] The device according to claim 4 is an elastically deformable slave.
The dynamic gear, the boss of the rotation center portion, the drive moving gear meshing tooth decay
An elastically deformable rim located outside the boss
The plurality of elastically deformable
And a unit that is integrally provided.

[0011]

According to the first aspect of the present invention, the driven gear is provided with releasing means.
To be displaced in the face width direction and mesh with the drive gear.
The operating force at this time is controlled by the driven gear
Much smaller than moving against the direction of car rotation
Is enough. Moreover, since the amount of movement of the driven gear is small,
Immediately disengaged, large negative force on the meshing part of both gears
No load is added.

According to the second aspect of the present invention , the driven gear meshes.
Is driven by the release means to bend the vicinity of the part
The mesh with the gear is released, so the entire driven gear
In the axial direction of the driven gear as in the case of
There is no need to secure a dynamic space, and around the driven gear
Other components can be placed closer to the device. Because of this,
It is suitable for shaping.

According to the third aspect of the present invention , the meshing means is provided with a tooth.
Release when releasing the pressure on the car support member and returning
The means presses the vicinity of the meshing part of the driven gear to mesh
When the engagement means returns, the driven gear
To return to the disengagement position. Therefore, from the disengagement
The return operation to the detached position is performed more smoothly.

According to the configuration of claim 4, at least the driven
Since the rim of the gear and the plurality of arms can be elastically deformed,
The vicinity of the meshing portion of the driven gear is more easily bent,
The operating force at the time of disengagement can be further reduced.

[0015]

An embodiment of the present invention will be described below with reference to the drawings. In this embodiment, the present invention is applied to a portable tape recorder.
Applied to a gear type power transmission device , as shown in FIGS.
As shown in FIG. 13, on the rectangular synthetic resin chassis 1
The tape cassette 2 is mounted on the surface side. Chassis 1 is
It is smaller than the tape cassette 2. On the top of chassis 1
Is a take-up reel receiver 3 and a supply reel as shown in FIG.
The holder 4 is rotatably mounted and the head support plate 5
Are slidably mounted in the front-rear direction. Head support plate
A reproducing head 6 is mounted on 5. Head support
A part of the holding plate 5 is a reproduction operation lever 7,
By pushing the bar 7, the head 6 is moved into the cassette 2.
It can be brought into contact with the tape 8.

In the vicinity of the take-up reel receiver 3 of the chassis 1,
The corner is a motor for attaching the tape driving motor 10.
It is a mounting portion 1a. This motor mounting part
1a is almost equivalent to the thickness of the motor as shown in FIG.
It is lower than the other parts of the chassis 1. FIG.
As shown in FIG. 1, the motor shaft 11 has a motor mounting portion 1a.
Projecting to the lower surface side of the
It is fixed. A shaft 1 fixed to the lower surface of the chassis 1
A relay pulley 14 is rotatably supported on the relay pulley 3. This
Relay pulley 14 has a large diameter portion 14a and a small diameter portion 14b.
The first belt is attached to the large diameter portion 14a and the motor pulley 12.
The rotation of the motor shaft 11 is performed in one step.
Slow down.

In FIG . 12, reference numerals 17 and 18 denote chassis 1 respectively.
A capstan and a pinch roller arranged on the upper surface of the
You. The pinch roller 18 is moved toward and away from the capstan 17
It is free. The capstan 17 is shown in FIG.
Thus, it is rotatably supported by the bearing 19 integral with the chassis 1.
The flywheel 20 is fixed to the lower end. Hula
The wheel 20 has a small gear 21 as shown in FIG.
Small diameter part of flywheel 20 and relay pulley 14
A second belt 22 is stretched around 14b. fly
The part where the belt of the wheel 20 is hung has a large diameter.
Thus, the rotation of the motor shaft 11 is further reduced by one step. What
9 and 11 is the lower end of the capstan 17.
Is a support member for supporting the
Have been.

As shown in FIG . 12, the take-up reel receiver
3 is a small diameter first reel gear 25 and a large diameter second reel gear.
The vehicle 26 is provided. The first reel gear 25 is a high-speed rotary transmission.
The second reel gear 26 is for transmitting low-speed rotation. No.
The first and second reel gears 25 and 26 are located below the chassis 1, respectively.
It is located on the surface side and the upper surface side. Also, under chassis 1
A drive gear 27 is arranged at the center on the surface side. this
The gear 27 is attached to a first swing lever 28 as shown in FIG.
It is rotatably supported, as shown in FIGS.
Has an external tooth portion 27a and an internal tooth portion 27b. External teeth 2
7a always meshes with the small gear 21. First
Swing lever 28 is formed by integral molding with the chassis 1.
The first is provided at the center of the chassis 1.
It is located in the opening 29 (see FIG. 12), and one end is a joint.
30 and the periphery of the opening of the first opening 29.
(See FIG. 8), the joint 30 is used as a fulcrum, and the arrow in FIG.
It is rotatable in the direction of the mark A.

The first swing lever 28 is a joint
30 part has elastic return force, fast forward operation lever
31 is pushed by the operation lever 31 and turned.
To engage the external teeth 27a with the first reel gear 25.
However, the elasticity of the joint 30 due to the return of the operation lever 31
The external tooth portion 27a is moved from the first reel gear 25 by the return force.
The rotation is returned in the direction to separate. As shown in FIG.
An intermediate gear 33 is disposed adjacent to the take-up reel receiver 3.
Have been. The gear 33 has a large gear portion as shown in FIG.
33a and a small gear portion 33b, and a second swing lever-3.
4 rotatably supported. Second swing lever 34
Is formed by integral molding with the chassis 1.
In the first opening 29 (see FIG. 12),
The end is around the opening of the first opening 29 via the joint 35.
It is connected to the edge (see FIG. 8), and the joint 35 is used as a fulcrum.
8, and can be rotated in the direction of arrow B in FIG.

The second swing lever 34 is a joint
It has an elastic restoring force at the 35 portion, and the playback operation lever 7
Is pushed by the operation lever 7 to rotate,
The large gear portion 33a and the small gear portion 33b of the intermediate gear 33 are
Mesh with the internal teeth 27b and the second reel gear 26, respectively.
However, the elasticity of the joint 35 is restored with the return of the operation lever 7.
The large gear portion 33a and the small gear portion 33b are
The direction in which the internal gear portion 27b is separated from the second reel gear 26
And return to rotation. On the other hand, the supply reel receiver 4 has its shaft
12 is rotatably supported on the chassis 1 as shown in FIG.
And a lower end of the chassis 1 at a lower end of the shaft 40.
In FIG. 11, as shown in FIG.
Fixed. The third reel gear 41 has a driven gear
42 are always engaged.

The driven gear 42 is shown in FIGS.
Rim 43 having teeth 42a on the outer periphery,
Between the bosses 44 in a radial manner by a plurality of arms 45.
Tyed synthetic resin, especially rim 43 and arm 45
Has a structure (dimensions) that is easily elastically deformed in the tooth width direction.
Also, as shown in FIG.
Shaft 46, which rotates around a gear support member 47.
Rollably supported. The driven gear 42 is
The third reel gear 41 is always meshed.

The gear support member 47 is integrated with the chassis 1.
It is formed by molding.
It has a cylindrical portion 49, and the shaft 46 is rotated on the cylindrical portion 49.
They are freely fitted. On the outside of the cylindrical portion 49,
Engagement projection 50 projecting in a direction slightly opposite to plate-like body 48
Have. The gear support member 47 is provided with a second
Position in the opening 51 (see FIGS. 1, 3 to 5 and 12)
The other end of the plate-shaped body 48 is connected to the second
The opening 51 is connected to the periphery of the opening 51 (see FIG. 8).
It is possible to rotate in the direction of arrow C in FIG.
Has become.

The gear supporting member 47 is connected to a joint 52.
The part has elastic return force, and the winding
Operation is performed by pushing the return lever 55.
Engage with the curved portion 56 of the lever 55 (see FIGS. 1 and 3 to 5).
The projection 50 is rotated by being pushed, and the driven gear 42 is moved to the third reel.
The external tooth portion of the drive gear 27 while meshing with the gear 41
27a, but with the return of the operation lever 55,
The driven gear 42 is driven by the elastic return force of the joint 52.
The rotation is returned in a direction to separate the moving gear 27 from the moving gear 27. Ie teeth
The vehicle support member 47 connects the driven gear 42 with the drive gear 27.
A return means for returning to the separated position is provided.

The position where the driven gear 42 meshes with the drive gear 27
The direction of the movement is determined by the rotation of the drive gear 27.
The direction of the roll is set. That is, as shown in FIG.
The drive gear 27 rotates counterclockwise, and
The gear 42 extends along a tangent line X at the mesh point of the drive gear 27.
Is moved upward in the figure. The rewind operation above
The operation lever 55 is provided on the lower surface side of the chassis 1 with a fast-forward operation lever.
It is mounted adjacent to the bar 31 so as to be slidable in the front-rear direction.
The distal end portion 55a is connected to the driven gear 42 and the gear supporting member 47.
I'm in the middle. The tip portion 55a has a support portion
The curved portion 5 is provided at a portion of the material 47 facing the engagement protrusion 50.
6 and a concave portion 57 connected thereto.

A lock plate 58 is provided on the upper surface of the chassis 1.
Are slidably mounted in the left-right direction. This lock
The rate 58 is a playback operation lever 7, a fast forward operation lever-3.
Pressing position of both 1 and rewinding operation lever 55
Can be locked, but only one of them can be locked
No. The playback operation lever 7 and the fast forward operation lever 31
Or on the lock plate 58 of the operation lever 55 for rewinding.
Release from the pushing position and return to the initial position.
Press the stop lever 59 (see FIGS. 11 and 12)
You only need to operate it .

The stop lever 59 is slid in the front-rear direction on the chassis 1.
It is movably mounted, and this lever 59 is pushed in.
The lock plate 58 in the unlocking direction.
By moving the operation lever, various operation levers can be returned.
The fast-forward operation lever 31 and the rewind operation lever 55
Always biased toward the initial position by the return spring 60a
Have been. Also, the reproduction operation lever 7 and the stop lever 59
Are return springs 60b and 60c (FIGS. 11 and
(See FIG. 12).
You.

As shown in FIG . 3 to FIG .
The operation lever 55 is configured to mesh between the driven gear 42 and the drive gear 27.
It has a pressing portion 61 extending toward the vicinity of the mating portion. This
The base end of the pressing portion 61 has a thick wall as shown in each of FIGS.
A thin flexible portion 62 is formed, and the pressing portion 61
Is bent up and down. Lower surface of pressing portion 61
Has a protruding portion 63 extending forward, and
A pair of protrusions 64a and 64b are provided. One
The protrusion 64a meshes with the driven gear 42 and the driving gear 27.
And between the two gears 42, 27
It has become so. Front and rear of projections 64a, 64b
As shown in FIG. 6, the surface
First and second inclined surfaces 6 inclined toward the rear of the shell 1
5a and 65b.

The pressing portion 61 and the projections 64a, 64b
Through a third opening 66 provided in the chassis 1.
The third opening 66 is exposed on the upper surface side of the chassis 1 and left and right.
Guides 67a, 67 projecting inwardly
b is projected. These guides 67a, 67b
The pressing unit 61 constitutes a release unit. The release means
When the driven gear 42 is engaged with the driving gear 27,
The gear 42 is pressed in the face width direction to release the mesh.
However, this will be described later.

The guides 67a and 67b are used for rewinding operation.
3 and 6 (a) where the bar 55 is not pushed in.
Are located in front of the projections 64a and 64b,
The rear surfaces of the guides 67a, 67b
A first guide surface 68a that is inclined toward the front side of the sheet 1;
It has become. One guide 67a extends downward.
With an elongated extension 70, the front of the extension 70
The second is inclined toward the rear of the chassis 1
Guide surface 68b.

Then, the rewind operation lever 55 is pushed in.
When made, as shown in FIG. 6B, the protrusions 64a, 64b
Of the guides 67a, 67b
The pressing portion 61 contacts the guide surface 68a, and the pressing portion 61
The projections 64a and 64b are bent
Get on the roads 67a and 67b. And the projections 64a, 6
When 4b gets over the guides 67a and 67b, FIG.
As shown in FIG.
1 rotates downward, and the projections 64a and 64b
a, 67b, and the rewind operation
The bar 55 is locked at this position by the lock plate 58.
Is done.

On the other hand, when the rewind operation lever 55 is pushed in,
As shown in FIG. 4, the bending portion 56 is provided with a third swing lever.
47, and presses the driven gear 42 to the driving gear.
27. At this time, the engagement protrusion 50
Has shifted from the curved portion 56 into the concave portion 57. Driven tooth
When the wheel 42 meshes with the drive gear 27, the
The rotation of the gear 17 is performed by the small gear 21, the drive gear 27, and the driven gear 4.
Supply reel receiving via second and third reel gears 41 sequentially
4 and the tape 8 is rewound. Stop lever 59
When the button is pressed, the rewind lever 55 is moved to the initial position.
However, as shown in FIG.
The second inclined surfaces 65b of the raised portions 64a and 64b
a, 67b, and then as shown in FIG.
The pressing portion 61 does not bend downward at the flexible portion 62.
Meanwhile, the protrusions 64a and 64b are aligned with the second guide surface 68b.
To go under the guides 67a and 67b.

At this time, the pressing portion 61 is moved to the position shown in FIG.
As shown in the figure, meshing between the driven gear 42 and the driving gear 27
Depress the rim 43 or arm 45 near the position,
The vicinity of the meshing position of the driven gear 42 is bent. This
The driven gear 42 receives a rotational load such as a tape tension while receiving a rotational load.
Also easily disengages with the drive gear 27, and
The power transmission path from the supply reel 4 to the supply reel receiver 4 is shut off.
In addition, a bending portion is formed with the return operation of the rewind operation lever 55.
56 is separated from the engagement projection 50 of the gear support member 47.
The support member 47 is moved by the elastic return force of the joint 52.
The guides 67a, 67b.
b and the pressing portion 61 by the elastic return force of the flexible portion 62.
Is returned to the initial position, and the driven gear 42 is also pushed from above.
The pressure is released and returns to the initial shape by its own elastic return force,
The driven gear 42 is disengaged from the drive gear 27, and
Return to the release position.

As described above, in the configuration of this embodiment, the driving
The meshing of the driven gear 42 with the gear 27 is performed by the driven gear 42
In the direction of rotation of the drive gear 27.
No engagement is released by the release means (guides 67a, 67b
And the pressing portion 61) moves the driven gear 42 in the face width direction.
Pressing, followed by a return means (elastic return
Gear support member 4 including a joint 52 portion having a return force
7) returns the driven gear 42 to the disengaged position before meshing
It is configured to be. Therefore, the driven gear
The operating force for bending the driven gear 42 is
Much smaller than moving against the direction of rotation of 7
Is enough. In particular, the rim 43 or arm of the driven gear 42
Because only a part of 45 is partially bent,
Light operating force is sufficient. In addition, the driven gear 42
The amount of movement is so small that it can be disengaged instantly.
At the time of the disengagement,
There is no heavy load.

In addition, in the vicinity of the meshing portion of the driven gear 42
Partially bends and the engagement with the drive gear 27 is released.
Therefore, when the entire driven gear 42 is translated in the axial direction
It is not necessary to secure a wide space as in
Parts and other functional parts are arranged close to the driven gear 42.
This makes the device suitable for downsizing the device.

The present invention is not limited to the above embodiment.
Rather, instead of various modifications without departing from the spirit
It is feasible. For example, partially deflect the driven gear
Instead of disengaging them, if space allows,
Disengagement by displacing the entire dynamic gear in the face width direction
It is possible.

[0036]

According to the present invention, the driving gear and the driven gear
When a rotational load is acting on the driven gear
Even in the state where it is, without opposing the direction of rotation of the drive gear,
Disengage the two with a small operating force and instantly
Can be. Also, when disengaging , both gears
No large load is applied to the mating part, and the gear is damaged
Can also be prevented.

Further , the driven gear can be elastically deformed by a synthetic resin.
It is made of grease so that only the meshing part is bent.
Operating force can be further reduced,
There is no need to secure a wide space for operation,
It becomes more suitable for downsizing of the body. In particular, for driven gears
The rim and boss are connected by a radial arm,
By making the meshing part easy to bend, the operating force is further reduced.
Can be reduced.

[Brief description of the drawings]

FIG. 1 is a rear view showing a periphery of a driven gear mounting portion of a chassis according to an embodiment of the present invention.

FIG. 2 is a rear view showing a relationship between a driven gear and a rewinding operation lever.

FIG. 3 is a rear view showing the relationship between the rewind operation lever and the gear support member before the rewind operation lever is pressed.

FIG. 4 is a rear view showing the relationship between the rewinding lever and the gear support member after the rewinding lever is pushed in;

FIG. 5 is a rear view showing the relationship between the rewind operation lever and the gear support member when the rewind operation lever is at a position during return.

FIG. 6A is a cross-sectional view showing a relationship between a rewind operation lever, a guide of a chassis, and a driven gear before the rewind operation lever is pressed. (b) is a sectional view showing the relationship between the rewind operation lever, the guide, and the driven gear while the rewind operation lever is being pushed. (c) is a sectional view showing the relationship between the rewind operation lever, the guide, and the driven gear after the rewind operation lever is pushed in. (d) is a sectional view showing the relationship between the rewind operation lever, the guide, and the driven gear during the return of the rewind operation lever.

FIG. 7 is a sectional view showing a state in which the driven gear and the drive gear have disengaged from each other;

FIG. 8 is a plan view schematically showing a power transmission path from a capstan to a take-up reel receiver.

FIG. 9 is a sectional view showing the relationship among a capstan, a small gear, and a drive gear.

FIG. 10 is a sectional view showing a relationship between a driven gear and a gear supporting member.

FIG. 11 is a rear view showing a mechanical part of a tape recorder provided with a gear type power transmission device.

FIG. 12 is a plan view showing a mechanical part of a tape recorder provided with a gear type power transmission device.

FIG. 13 is a side view of FIG. 12 viewed from a direction D.

[Explanation of symbols]

 Reference Signs List 10 motor 27 drive gear 42 driven gear 42a tooth 43 rim 44 boss 45 arm 47 return means (gear support member) 55 engagement means (rewinding operation lever) 56 bending part 61, 67a, 67b release means (Pressing part and guide)

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16H 1/20 F16H 3/34 G11B 15/26

Claims (4)

(57) [Claims] 1. A drive tooth rotatably driven by a motor (10).
The meshing position between the wheel (27) and this drive gear, and the same surface as the drive gear
A driven gear (42) movable between the disengagement positions above, and the driven gear is driven relative to the rotating driving gear.
On the same surface as the gear, move from the disengaged position to the meshing position,
Meshing means (55) for moving in the direction of rotation of the driving gear
And the driven gear is displaced in the face width direction to thereby form the driven tooth.
Release means (61, 67a, 67) for disengaging the drive gear from the vehicle
b) and the driven gear separated from the drive gear by the release means
A gear type power transmission device comprising: a return means (47) for returning to a disengaged position . 2. The apparatus according to claim 1, wherein said driven gear (42) is
It is made of an elastically deformable synthetic resin, and the release means (61, 67a, 67b) closes the meshing portion of the driven gear.
A gear-type power transmission device characterized in that a side is pressed in a width direction of a tooth to bend . 3. The apparatus according to claim 2, wherein
With a gear support member (47) that rotatably supports the dynamic gear (42)
This gear support member moves the driven gear to the above-mentioned disengaged position.
The engagement means (55) has an elastic return force to the position to be positioned, and the meshing means (55) presses the gear support member to
Moving the car from the disengagement position to the meshing position.
And, said release means (61,67a, 67b) is integrally formed of the meshing allowed means
And the meshing means releases the pressing against the gear supporting member.
Near the meshing part of the driven gear
A gear-type power transmission device characterized by pressing the side . 4. The driven gear (42) according to claim 2, wherein
Are the boss (44) at the center of rotation and the teeth meshing with the drive gear.
(42a) and an elastically deformable rib located outside the boss
(43) and multiple elastic members radially connecting the boss and rim
A gear type power transmission device, comprising a deformable arm (45) integrally .