JPH0447780Y2 - - Google Patents

Description

[Detailed Description of the Invention] The rotating lever rotation mechanism of the present invention will be explained according to the following items.

A. Field of industrial application B. Overview of the invention C. Prior art [Figures 5 and 6] D. Problems that the invention aims to solve [Figures 5 and 6] E. Means for solving the problems F Example a Reel stand [Figures 1 to 4] b Rotating lever rotation mechanism [Figures 1 to 4] b-1 Regulation hole, engagement pin, drive gear [first
[Figures 1 to 4] b-2 Rotating lever [Figures 1 to 4] b-3 Tension spring, first rotation fulcrum of the rotating lever [Figures 1 to 3] b-4 Mode Switching lever [Figures 1 to 4]
Figure] b-5 Second rotation fulcrum of the rotation lever c Operation c-1 Operation in forward mode [Figure 1] c-2 Formation of reverse mode from forward mode [Figures 1 to 3 ] c-3 Formation of forward mode from reverse mode [Figures 1 to 3] G. Effects of the invention (A. Field of industrial application) The present invention relates to a novel rotating lever rotation mechanism.
Specifically, for example, a swinging gear that selectively meshes with each gear part of two reel stands provided in a tape recorder is supported by a rotating end part, and the swinging gear is connected to one of the two gear parts. A rotating lever such as a swinging lever that is moved between a position where it engages with one end and a position where it engages with the other end is provided, and the pivot lever moves between two positions, one end and the other end, in its rotation stroke. When the rotary lever reaches any position, the contact portion provided at the rotating end of the rotary lever comes into contact with the regulating means for regulating the position, and the contact state exerts a so-called limiter effect. This relates to a rotating lever rotating mechanism that needs to be elastically held by the elastic force of an elastic means, and by improving the structure of the rotating fulcrum of the rotating lever, the rotating The lever can be made into a one-piece structure, and a single resilient member can apply rotational force to the rotating lever in two directions that are substantially opposite to each other. It is an object of the present invention to provide a novel rotating lever rotating mechanism that can be configured with the minimum number of members without impairing any necessary functions.

(B Overview of the invention) The rotating lever rotating mechanism of the present invention includes a rotating lever that is rotated between two positions that are the positions at both ends of a predetermined rotation stroke, and the rotating lever is rotated between two positions. When the rotary lever reaches either of the two positions, one end and the other end, of the rotary stroke, the contact portion provided at the rotary end of the rotary lever abuts against a regulating means for regulating the position; In a rotating lever rotating mechanism in which the contact state is required to be elastically maintained by the elastic force of an elastic means that performs a so-called limiter action, the rotating lever rotates the rotating lever. When the lever is not pressed by the pressing means, its pivot point is closer to the rotation end than the position where the springing means is connected, and when it is pressed by the rotating lever pressing means, By arranging the pivoting fulcrum at a position opposite to the pivoting end across the location where the springing means is connected, this type of mechanism can be constructed using the minimum number of members necessary without impairing the necessary functions at all. It is designed so that it can be configured by

(C. Prior Art) [Figures 5 and 6] For example, a tape recorder, etc. is equipped with two reel stands, one of which is rotated according to a predetermined mode, and is rotated by a motor. A rotary lever (“oscillating lever”) that is always engaged with the drive gear that is rotated and is rotatably supported on the chassis side.
Alternatively, it may be called a "swing lever" or the like. A rocking gear rotatably supported at the rotating end of the reel is selectively engaged with the gear portions of the two reel stands, thereby rotating either one of them. The rotation stroke of such a rotation lever is adjusted so that the swing gear supported at the rotation end does not engage with the gear portion of the reel stand at a depth greater than a predetermined engagement depth. When it comes to the one end position of the rotation stroke, it comes into contact with one end of the predetermined regulating means, and when it comes to the other end of the rotation stroke, it comes into contact with the other end of the said regulating means, and the respective states are changed. It is adapted to be resiliently held by resilient means.

FIGS. 5 and 6 show an example a of a conventional reel stand drive device equipped with such a rotating lever.

b and c are reel stands rotatably supported on the chassis d side. Of these two reel stands b and c, the one on the right side b is engaged with the supply side tape reel f of the tape cassette e, and the one on the left side c is engaged with the take-up side tape reel g. This is the T-side reel stand, h is the gear part of the S-side reel stand b, and i is the gear part of the T-side reel stand c.

j is a rotating lever rotating mechanism.

k is a rotating lever. The rotating lever k consists of two levers, a main lever _k1 and a limiter lever _k2 , and one end of the limiter lever _k2 is rotated via a connecting pin l at approximately the center in the longitudinal direction of the main lever _k1 . In addition to being supported freely, there is a limiter spring m between these two levers _k1 and _k2 .
is tensioned, and the other end of the limiter lever _k2 is in elastic contact with the other end of the main lever _k1 while no force is applied thereto to separate it from the main lever _k1 , In this state, the two levers _k1 and _k2 are rotated integrally.

n is a support shaft erected from chassis d;
The main lever _k1 is rotatably supported by the support shaft n at a substantially central position between its one end and the connecting pin l. Therefore, the main lever _k1 is rotated using the position supported by this support shaft n as a rotation fulcrum.

A drive gear o is rotatably supported by the support shaft n and rotated by a motor (not shown), and the drive gear o is rotated counterclockwise.

p is a support shaft fixed to one end of the main lever k ₁ so as to pass through it in the thickness direction, and a swing gear q meshes with the drive gear o at the upper part of the support shaft p. The lower part of the support shaft p is located in a regulation hole r formed in the chassis d and extending in a substantially arc shape.

s is a tension spring whose one end is supported on the chassis d side, and the other end is hooked to a substantially intermediate portion between the connecting pin l of the main lever _k1 and the other end. Therefore, the rotational lever _k1 is always biased with a rotational force in the counterclockwise direction by the tension spring s.

t is a sliding lever. The right end of the sliding lever t is positioned to the right of the other end of the limiter lever _k2 , and the slide lever t is in the forward mode, that is, the magnetic tape u of the tape cassette e is pulled out from the S reel f and wound onto the T reel g. In the mode in which the vehicle is traveling in the direction in which it is being driven (hereinafter referred to as the "forward direction"), the limiter lever _k2 is held in a position where it is not pressed, and the operation mode is changed from the forward mode to the reverse mode, that is, the magnetic When switching to a mode in which the tape u is run in a direction opposite to the forward direction, it is moved to the left by a predetermined stroke, thereby moving the other end of the limiter lever _k2 to the left by a predetermined amount.

v is a direction changing gear meshed with the gear portion h of the S-side reel stand b.

Therefore, in the state where the sliding lever t is in a position where it does not press the limiter lever _k2 , that is, in the state shown in FIG. The lower part has come into contact with the left edge of the regulation hole r formed in the chassis d, and thereby the swing gear g
and the gear part i of the T-side reel stand c are engaged with each other at a predetermined engagement depth, and in this state, the rotating lever k is biased by the tensile force of the tension spring s in the counterclockwise direction. The rotational force of the support shaft p
is held by being pressed against the left edge of the regulation hole r.

When the drive gear o is rotated from this state, the T-side reel stand c is rotated clockwise, and the T-reel g is thereby rotated in the tape winding direction, so that the magnetic tape u is rotated as described above. The vehicle will be driven in the forward direction.

Furthermore, when the sliding lever t is moved to the left from the state shown in FIG. 5, the sliding lever t presses the other end of the limiter lever _k2 substantially toward the left. k is rotated clockwise around the support shaft n. The rotary lever k, which is rotated in the clockwise direction in this way, has a lower part of its support shaft p that is connected to the regulation hole r.
When it comes into contact with the right edge of the main lever _k1 , the clockwise rotation of the main lever k1 is prevented. From this state, only the limiter lever _k2 rotates around the connecting pin l, that is, the main lever k1 is rotated around the connecting pin l. It will be rotated relative to ₁ . The leftward movement stroke of the sliding lever t is long enough to move the other end of the limiter lever _k2 to a position a certain distance away from the other end of the main lever _k1 .

When the sliding lever t is moved to the left by the above-mentioned predetermined stroke, the limiter spring m is expanded, so that the main lever _k1 of the rotating lever k is now subjected to clockwise rotational force by the limiter spring m. This causes the support shaft p to be pressed against the right edge of the regulation hole r. As a result, the swing gear q and the direction changing gear v are meshed with each other at a predetermined meshing depth, and this state of meshing is maintained by the elastic force of the limiter spring m.

From this state, when the drive gear o is rotated, the S-side reel stand b is rotated counterclockwise, thereby causing the magnetic tape u to travel in the reverse direction.

(D. Problem that the invention attempts to solve) [Figure 5,
In the conventional rotating lever rotating mechanism j described above, the rotating lever k must be composed of two levers, the main lever _k1 and the limiter lever _k2 , and the Since two spring members, a limiter spring m and a tension spring s, are required as a generating means, there are problems such as a complicated structure and an increase in cost.

(E. Means for Solving Problems) In order to solve the above-mentioned problems, the rotating lever rotating mechanism of the present invention is provided with a contact portion provided at the working end of the rotating lever. A restricting means for preventing the movement of the working end, one end of which is connected to the rotary lever and the other end supported by the chassis, and the working end of the rotary lever moves in one direction. The rotating lever is activated by pressing a resilient means for applying the rotating force to the rotating lever and a pressed portion of the rotating lever located on the reaction end side across the position where the resilient means is connected. a pressing means for rotating against rotational force, a guide hole extending in a substantially arc shape is formed in one of the chassis and the rotating lever, and the other is slidably engaged with the guide hole. It is equipped with an engaging pin.

Therefore, when the rotating lever is not pressed by the pressing means, the pivoting fulcrum of the rotating lever is in a position where it comes into contact with one end edge of the guide hole of the engagement pin, and the elasticity of the resilient means is The generated force acts as a crimping force that presses the contact portion of the rotary lever against one end of the regulating means, and when the rotary lever is pressed by the pressing means, the pivot point of the rotary lever is The pressed portion is in a position where it comes into contact with the pressing means, and the resilient force of the resilient means acts as a pressing force that presses the contact portion of the rotary lever against the other end of the regulating means. The movable lever can be made into a single-piece structure, and a single elastic means can apply rotational force to the rotary lever in two mutually opposite directions.

(F. Embodiment) The details of the rotary lever rotation mechanism of the present invention will be described below with reference to the embodiment shown in the accompanying drawings.

In the embodiment shown in the drawings, the present invention is applied to a rotating lever rotating mechanism in a reel stand drive device of an audio tape recorder.

(a Reel stand) [Figures 1 to 4] Reference numeral 1 denotes a reel stand drive device, and the reel stand drive device 1 is selectively engaged with two reel stands and the gear portions of the two reel stands. It consists of a swing gear, a swing lever that supports the swing gear, a swing lever rotation mechanism for rotating the swing lever, and the like.

2 and 3 are reel stands (only a part of which is shown in the drawing). These reel stands 2 and 3
gear portions 4, 4' formed in a substantially flat gear shape, and a shaft portion 5 erected from the center of the gear portions 4, 4';
5' and reel engaging shafts 6, 6' (see FIG. 4; only one of them is shown in the drawing) fitted onto the upper part of the shaft parts 5, 5'.
Rear end (in Figure 1, the upward direction is the rear side, and the downward direction is the front side. In addition, the left direction in the same figure is the left side, and the right direction is the right side. (In the following description, directions will be referred to in this direction.) Two reel stand support shafts 8, 8', which are erected from positions spaced from each other in the left and right direction, are separately and freely rotatable. is supported by

It should be noted that the supply side tape reel 10 (hereinafter referred to as "S reel") housed in the tape cassette 9 is removably engaged with the reel stand 2 located on the right side of the two reel stands 2 and 3. Reel stand (hereinafter referred to as
It's called the "S side reel stand." ), and the reel stand 3 located on the left side is the take-up side T reel 11 (hereinafter referred to as "T").
Reel.” ) is a reel stand (hereinafter referred to as "T-side reel stand") that is removably engaged.
Therefore, in a mode in which the magnetic tape 12 is run in the forward direction, that is, in the running direction in which it is pulled out from the S reel 10 and wound onto the T reel 11 (hereinafter referred to as "forward mode"), the T side reel is A mode in which the T-reel 11 is rotated in the tape winding direction by rotating the stand 3 clockwise, and the magnetic tape 12 is run in the reverse direction, that is, in the opposite direction to the forward direction (hereinafter referred to as " In the "reverse mode"), by rotating the S-side reel stand 2 counterclockwise, the S reel 10 is rotated in the tape winding direction.

Reference numeral 13 denotes a gear support shaft which is installed upright from a position slightly in front of the S-side reel stand 2 and slightly to the left of the chassis 7, and a relatively small diameter direction changing gear 14 is mounted on the gear support shaft 13. It is rotatably supported, and the direction changing gear 14 is meshed with the gear part 4 of the S-side reel stand 2.

(b Rotation lever rotation mechanism) [Figures 1 to 4] 15 is a rotating lever rotating mechanism.

(b-1 Regulation hole, engagement pin, drive gear) [1st
4] 16 is a regulating hole formed in the chassis 7.
The regulation hole 16 is a hole for regulating the rotation stroke of the operating end of a rotation lever, which will be described later, and is a hole for regulating the rotation stroke of the operating end of a rotation lever, which will be described later. It is formed in a shape that extends in an arc shape substantially along the left-right direction at a position slightly closer to the front.

Reference numeral 17 designates an engagement pin that is erected from a position slightly spaced from the regulation hole 16 of the chassis 7 toward the front.
The engagement pin 17 is a member that becomes a rotation fulcrum in the forward mode of the rotation lever, which will be described later, and a drive gear 18 having a relatively small diameter is rotatably supported on the upper part of the engagement pin 17.

The drive gear 18 is rotated clockwise by a motor (not shown).

(b-2 Rotating Lever) [Figures 1 to 4] 19 is a rotating lever. The rotary lever 19 is formed into an elongated substantially plate-like shape, and in the state shown in FIG. A support shaft 20 is fixed to the rotating lever 19 in the plate thickness direction (hereinafter referred to as the "working end"), and a swinging member is attached to the portion of the support shaft 20 that protrudes upward from the rotating lever 19. A moving gear 21 is rotatably supported.

Further, an elongated guide hole 22 is formed approximately at the center between the longitudinal center of the rotary lever 19 and the support shaft 20.
is formed in an arc shape extending in a direction substantially parallel to the width direction of the rotating lever 19.

Reference numeral 23 designates a spring-loaded pin that protrudes from a central portion of the rotary lever 19 in the longitudinal direction at a position slightly closer to the reaction end.

The rotating lever 19 is rotated through its guide hole 22.
The lower part of the engagement shaft 17 than the drive gear 18 is inserted into the shaft in a slidably engaged state, so that it is rotatable relative to the chassis 7, and its working end A portion of the support shaft 20 disposed in the portion 19a below the rotation arm 19 is placed in the regulation hole 16 formed in the chassis 7, and the swing gear 21 is in mesh with the drive gear 18. provided.

Therefore, the rotary lever 19 is provided so as to be rotatable with respect to the chassis 7 without using any other specific pivot point.

Further, when the rotation lever 19 is rotated, the swing gear 21 supported by the rotation lever 19 is not necessarily connected to the drive gear 1.
Although the guide hole 22 is not moved around the axis of the shaft 8, that is, the engagement pin 17, the guide hole 22 is moved in a circle around the support shaft 20, that is, the rotation center of the swing gear 21. Since the pivot lever 19 is formed to extend along the axis, the distance between the engagement pins 17 and the support shaft 20 is always a constant distance no matter which position the pivot lever 19 is pivoted about. Therefore, the depth of engagement between the drive gear 18 and the swing gear 21 does not change.

Thus, the swing gear 21 is always meshed with the drive gear 18, and is rotated counterclockwise when the drive gear 18 is rotated.

(b-3 Tension spring, first rotation lever
24 is a tension spring. The tension spring 24 has one end hooked to the spring hook pin 23 provided on the pivot lever 19, and the other end supported by a spring hook member (not shown) provided on the right side of the pivot lever 19 of the chassis 7. ing.

Therefore, the tensile force of the tension spring 24 acts on the rotary lever 19 so as to bias the rotary lever 19 in a predetermined direction.

That is, the support shaft 20 is not prevented from moving to the right, and the other end 19 is not blocked by the rotation lever 19.
b, that is, in a state where no pressing force is applied to press the end on the reaction end side (hereinafter, this end 19b is referred to as the "pressed end") approximately to the left, the rotating lever 19 The left edge 22 of the guide hole 22 of
a is pressed against the engagement pin 17, so in this state, the rotation fulcrum of the rotation lever 19 is set at the position where the left end edge 22a of the guide hole 22 abuts the engagement pin 17 (hereinafter, this position is referred to as the "first position"). 1 rotation fulcrum"). Therefore, in this state, the rotational force due to the tensile force of the tension spring 24 acts on the rotational lever 19 at a position in front of the first rotational fulcrum. A rotation force is applied in the counterclockwise direction around the rotation center.

When such a rotational force is applied to the rotational lever 19, the lower part of the support shaft 20 comes into contact with the left edge 16a of the regulation hole 16 formed in the chassis 7. Then, the rotating lever 19 comes to a position where its swing gear 21 meshes with the gear portion 4' of the T-side reel stand 3 (hereinafter, this position will be referred to as the "initial position").

(b-4 Mode switching lever) [Figures 1 to 4
Figure ] 25 is a mode switching lever (only a part of which is shown in the drawing). The main part of the mode switching lever 25 extends substantially in the left-right direction, and is formed with a plurality of long holes 26 (only one is shown in the drawing) that are long in the left-right direction.
A guide pin 27 erected from the front end of the chassis 8 is slidably engaged with the guide pin 6 . It is supported so that it can move in any direction. The right end portion of the mode switching lever 25 is bent rearward at a substantially right angle, and a pressing piece 25a is located in the bent portion at a position facing the pressed end portion 19b of the rotary lever 19 from substantially the right side. is formed.

Note that the mode switching lever 25 is similar to the rotating lever 19.
When the pressing piece 25a is in the initial position described above, the pressing piece 25a is pressed against the pressed end 1 of the rotating lever 19.
9b to the right (hereinafter, this position is referred to as the "forward position"), and when the reverse mode is formed, the elongated hole 26 is held as shown in FIG. The right edge is moved to a position where it is close to the guide pin 27 (hereinafter, this position will be referred to as a "reverse position").

(b-5 Second rotation fulcrum of the rotation lever) Therefore, when the mode switching lever 25 is moved toward the reverse position from the state where the rotation lever 19 is at the initial position, the pressing piece 25a
presses the pressed end 19b of the rotary lever 19 toward the left, so that the rotary lever 19
It will be rotated clockwise around the rotation fulcrum. And the rotation lever 19
When the is rotated in the clockwise direction by a predetermined rotation stroke in this manner, the lower part of the support shaft 20 comes into contact with the right edge 16b of the regulation hole 16 formed in the chassis 7, as shown in FIG. I will be in contact with you,
From this state, the lever switching lever 25 is moved a little further to the left to reach the reverse position.

Therefore, even after the support shaft 20 of the rotary lever 19 comes into contact with the right edge 16b of the regulation hole 16, the rotation lever 19 is further rotated in the clockwise direction. When the right edge 16b comes into contact with the right edge 16b, the movement of the support shaft 20 to the right is blocked there, so the rotation lever 19 in turn moves against the support shaft 20.
is rotated clockwise using the position where it abuts on the right edge 16b of the regulating hole 16 as a rotation fulcrum.

Then, when the mode switching lever 25 comes to the reverse position, the rotation of the rotating lever 19 is stopped, and in this state, the rotating fulcrum of the rotating lever 19 is such that the pressed end 19b is connected to the mode switching lever. 25 (hereinafter, this position will be referred to as the "second rotation fulcrum").

Therefore, in this state, the rotating lever 19
Since the rotational fulcrum is located in front of the spring hook pin 23, the tensile force of the tension spring 24 is applied to the rotational lever 19 in a clockwise direction about the second rotational fulcrum. This acts to bias the rotational force of.

(c. Operation) Therefore, the operation of the reel stand driving device 1 configured as described above is performed as follows.

(c-1 Operation in forward mode) [Fig. 1] In the forward mode, the mode switching lever 25 is in the forward mode position described above.

Therefore, the pivot lever 19 has its pressed end 19
b is not pressed, its pivot point is the first pivot point, that is, the left edge 2 of the guide hole 22.
2a is in a position where it comes into contact with the engagement pin 17, and the tensile force of the tension spring 24 acts on the rotating lever 19 so as to apply a rotating force in the counterclockwise direction.

As a result, the lower part of the support shaft 20 is attached to the chassis 7.
Since the rotary lever 19 is held in the initial position, the swing gear 21 is engaged with the gear portion 4' of the T-side reel stand 3. Therefore, these states are maintained by the counterclockwise rotation force applied to the rotation lever 19 by the tensile force of the tension spring 24.

The depth of engagement between the swing gear 21 and the gear portion 4' is regulated when the support shaft 20 is in contact with the left edge 16a of the regulation hole 16. The meshing depth is maintained at a predetermined depth determined by the distance between the shafts.

When the drive gear 18 is rotated from this state, the swing gear 21 is rotated counterclockwise, so the gear portion 4' is rotated clockwise. Since the T-side reel stand 3 is rotated clockwise, the T-reel 11 is rotated in the tape winding direction, and the magnetic tape 12 is run in the forward direction.

(c-2 Formation of reverse mode from forward mode) [Figs. 1 to 3] When forming the reverse mode, the mode switching lever 25 is moved to the reverse position described above, and the rotating lever 19 The pressed end 19b of is pressed substantially to the left.

Then, in the initial rotation state, the rotation lever 19 is rotated clockwise about the first rotation fulcrum against the tensile force of the tension spring 24, and the support shaft 20 is rotated clockwise. From the state in which the support shaft 20 is in contact with the right edge 16b of the hole 16, the support shaft 20 is rotated clockwise about the position in which it abuts the right edge 16b of the regulating hole 16, while further expanding the tension spring 24. As a result, the left end edge 22a of the guide hole 22 moves away from the engagement pin 17 substantially to the left.

Note that when the support shaft 20 comes to a position where it comes into contact with the right edge 16b of the regulation hole 16, the swing gear 21 meshes with the direction conversion gear 14.

When the mode switching lever 25 is moved to the reverse position, the rotation of the rotation lever 19 in the clockwise direction is stopped, and in this state, the rotation fulcrum of the rotation lever 19 is set to the second rotation position. The fulcrum, that is, the pressed end 19b is in contact with the pressing piece 25a of the mode switching lever 25.

As a result, the tensile force of the tension spring 24 acts on the rotating lever 19 to apply a rotating force in the clockwise direction about the second pivot fulcrum. Due to the rotational force in the clockwise direction, the lower part of the support shaft 20 is kept in contact with the right edge 16b of the regulation hole 16, and the swing gear 21 is kept in mesh with the direction changing gear 14. Become.

The depth of meshing between the swing gear 21 and the direction conversion gear 14 is determined by the distance between the support shaft 20 and the gear support shaft 13, which is defined when the support shaft 20 is in contact with the right edge 16b of the regulation hole 16. The meshing depth is maintained at a predetermined depth determined by the distance between the shafts.

When the drive gear 18 is rotated from this state, the swing gear 21 is rotated counterclockwise, so that the direction changing gear 14 is rotated clockwise.
Also, the gear portions 4 of the S-side reel stand 2 are rotated counterclockwise, which causes the S-side reel stand 2 to rotate counterclockwise, so that the S reel 10 is rotated counterclockwise. The magnetic tape 12 is rotated clockwise, that is, in the tape winding direction, and the magnetic tape 12 is run in the reverse direction.

(C-3 Formation of forward mode from reverse mode) [Figs. 1 to 3] When forming forward mode from reverse mode shown in Fig. 2, mode switching lever 25 is moved from reverse position to forward position. be returned to.
As a result, the rotational lever 19 is released from being pressed to the left against its pressed end 19b.
Due to the tensile force of the tension spring 24, the support shaft 20 is rotated counterclockwise around the position where it contacts the right edge 16b of the regulation hole 16, and the left edge 22a of the guide hole 22 is rotated. When it comes into contact with the engagement pin 17, it will be further rotated counterclockwise around the corresponding contact position, that is, the first rotation fulcrum.

Then, the support shaft 20 is connected to the left edge 16 of the regulation hole 16.
When it comes into contact with a, its rotation is stopped, and the swing gear 21 is brought into mesh with the gear portion of the T-side reel stand 3.

(G Effect of the invention) As is clear from the above description, the rotating lever rotating mechanism of the present invention includes a rotating lever rotatably supported by the chassis, and a rotating lever provided on the chassis side. a regulating means that prevents movement of the working end by being brought into contact with an abutting part provided at the working end; one end is connected to the rotating lever and the other end is supported on the chassis side; At the same time, an elastic means for applying a rotational force to the rotating lever so that its working end moves in one direction, and a reaction end side of the rotating lever across the position where the elastic means is connected. a pressing means for rotating the rotary lever against the rotational force by pressing a pressed portion located at the rotary lever, and a guide hole extending in a substantially arc shape in either the chassis or the rotary lever. and an engagement pin that slidably engages with the guide hole is provided on the other side, and when the pivot lever is not pressed by the pressing means, the pivot fulcrum of the pivot lever is engaged with the engagement pin. The pin is in a position where it comes into contact with one end edge of the guide hole, and the resilient force of the resilient means acts as a pressing force that presses the abutting part of the rotary lever against the one end of the regulating means, and the rotary lever is pressed. When pressed by the means, the pivoting fulcrum of the pivoting lever is at a position where the pressed portion comes into contact with the pressing means, and the elastic force of the elastic means causes the abutting section of the pivoting lever to be brought into contact with the above-mentioned regulation. It is characterized in that it acts as a crimping force for crimping the other end of the means.

Therefore, according to the present invention, the rotational force in the predetermined direction required when the rotation lever is at one end position of its rotation stroke, and the above required rotation force when the rotation lever is at the other end position. Since the rotational force in the opposite direction can be obtained by a single-piece rotating lever and one triggering means, this type of mechanism can be used in the minimum number necessary without compromising the necessary functions. It can be constructed from the following members.

In the above-mentioned embodiment, the guide hole was formed on the rotary lever side and the engagement pin was provided on the chassis side. may be provided on the rotating lever side.

Further, in the above embodiment, the engagement pin is used as a pin that supports the gear that supports the drive gear, but for example, when applying this rotation lever rotation mechanism to a tape recorder, etc. If there is a member that can be used as an engaging pin, such as a pushbutton sleeve or a cassette positioning pin, it may be possible to use that member.

Furthermore, the rotary lever rotation mechanism of the present invention is not limited to the application example shown in the above embodiment, but can also be used when the rotary lever is at any of the two positions, one end and the other end, of its rotation stroke. The abutting portion provided at the rotating end of the movable lever abuts the regulating means for regulating the position, and the abutting state is caused by the elastic force of the elastic means acting as a so-called limiter. It can be applied to various types of rotating lever rotating mechanisms that require resilient holding.

[Brief explanation of drawings]

Figures 1 to 4 show an example of an embodiment in which the rotating lever rotating mechanism of the present invention is applied to a rotating lever rotating mechanism in a reel stand drive device of an audio tape recorder. A partially cutaway plan view in the mode, and FIG. 2 is a partially cutaway plan view in the reverse mode. FIG. 3 is a partially cutaway plan view showing an intermediate state when the mode is switched, FIG. 4 is a sectional view taken along the - line in FIG. 1,
Figures 5 and 6 show an example of a rotary lever rotating mechanism in a conventional reel stand drive device, with Figure 5 being a partially cutaway plan view in forward mode, and Figure 6 being a partially cutaway plan view in reverse mode. FIG. 3 is a partially cutaway plan view. Explanation of symbols, 7... Chassis, 15... Rotating lever rotating mechanism, 16... Regulating means, 17... Engaging pin, 19... Rotating lever, 19b... Pressed part, 20... Contact portion, 22...Guide hole, 24...
...impulse means, 25...pressing means.

Claims (1)

[Claim for Utility Model Registration] A rotary lever rotatably supported by the chassis is brought into contact with an abutting portion provided on the chassis side and provided at the working end of the rotary lever. a regulating means for preventing movement of the working end; one end connected to the rotary lever and the other end supported by the chassis; and a restricting means for preventing the working end from moving in one direction. The rotational force is applied to the rotational lever by pressing a resilient means for energizing the power and a pressed portion of the rotational lever located on the reaction end side across the position where the resilient means is connected. a pressing means for rotating the chassis and the rotary lever; a guide hole extending in a substantially arc shape is formed in one of the chassis and the rotary lever, and an engagement pin slidably engages with the guide hole in the other; is provided, and when the rotating lever is not pressed by the pressing means, the pivoting fulcrum of the rotating lever is in a position where it comes into contact with one end edge of the guide hole of the engaging pin, and the elasticity of the resilient means is The generated force acts as a crimping force that presses the contact portion of the rotary lever against one end of the regulating means, and when the rotary lever is pressed by the pressing means, the pivot point of the rotary lever is The pressed portion is in a position where it comes into contact with the pressing means, and the resilient force of the resilient means acts as a pressing force that presses the contact portion of the rotary lever against the other end of the regulating means. Features a rotating lever rotating mechanism.