JP3461869B2 - clutch - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a clutch used in a cut sheet feeding mechanism or the like.

[0002]

2. Description of the Related Art FIG. 11 is a diagram for explaining a conventional clutch. In the figure, 11 is a drive wheel, 12 is a driven wheel having a ratchet wheel portion 12a formed on the inner periphery thereof, 13 is an intermediate wheel disposed between the drive wheel and the driven wheel,
14 is an arm.

The intermediate wheel 13 is formed with a guide groove formed of guide groove portions 13a, 13b and 13c on the surface facing the drive wheel 11, and the guide groove portions 13a and 13b are made of an elastic resin portion made of an elastic resin. It is divided by 13d. The left side of the elastic resin portion 13d is integrated with the intermediate wheel 13, but the lower portion on the right side is separated from the intermediate wheel 13, and the guide groove portions 13b and 13c are acutely angled, and the guide groove portion 13 is formed.
It contacts the end of the guide groove at an angle such that the side a is obtuse.

One end of the arm 14 is supported by the drive wheel 11 as a fulcrum 14a, and a projection 14b formed at the other end at a right angle is positioned in the guide groove as an action point so that it can move according to the rotation of the drive wheel 11. There is. Also, the protrusion 14b
Is always subjected to a force in the outer circumferential direction of the drive wheel by a spring 14c arranged between the arm 14 and the drive wheel 11. Ratchet pole 13e arranged in the guide groove 13c
Is configured to engage with the ratchet wheel portion 12a formed on the driven wheel 12 against the elastic force of the spring 13f by being pushed by the protrusion portion 14b of the arm. A belt-shaped brake 15, which is a separate body, is wound on the outer side of the intermediate wheel 13, so that the intermediate wheel does not rotate until a rotational force of a predetermined value or more acts on the intermediate wheel 13.

First, when the drive wheel 11 is rotated clockwise, the protrusion 14b of the arm located in the guide groove has the fulcrum 14a of the arm supported by the drive wheel 11.
It moves along the guide groove in which it is located. Guide groove 1
The protrusion 14b of the arm located at 3a moves as it is, and the protrusion 14b of the arm located at the guide grooves 13b and 13c forms an acute angle with the elastic resin portion 13d, so that the elastic resin portion 13d is elastic. Thus, it passes through the elastic resin portion and moves to the guide groove portion 13a. In this way, when the protrusion 14b of the arm reaches one end of the guide groove 13a, the intermediate wheel 13 is rotated clockwise. In this state, the ratchet pole 13e is not pushed by the protrusion 14b of the arm, so that the ratchet pole 13e and the ratchet wheel portion 12a do not mesh with each other, and the intermediate wheel 13 and the driven wheel 12 are idling. (First step)

Next, when the drive wheel 11 is rotated in the counterclockwise direction, the arm protrusion 14b receives a force outward in the circumferential direction by the spring 14c, but the arm protrusion 14b forms a contact with the elastic resin portion 13d. Since the angle formed is an obtuse angle, the elastic resin portion hits the end of the guide groove, and the protruding portion 14b of the arm cannot pass through the elastic resin portion and moves along the guide groove portion 13a. When the protrusion 14b of the arm reaches the other end of the guide groove 13a,
The intermediate wheel 13 is rotated counterclockwise. Even in this state,
Since the ratchet pole 13e is not pushed by the protruding portion 14b of the arm, the ratchet pole 13e and the ratchet wheel portion 12a do not mesh with each other, and the intermediate wheel 13 and the driven wheel 12 are idling. (Second step)

Next, when the drive wheel 11 is rotated in the clockwise direction, the protrusion 14b of the arm moves along the guide groove 13b because it receives the force in the outer circumferential direction. The drive wheel 11 is rotated clockwise until the arm protrusion 14b reaches the entrance of the guide groove 13c. (Third step)

Next, the protrusion 14b of the arm is aligned with the guide groove 1
When the drive wheel 11 is rotated counterclockwise when reaching the entrance of 3c, since the protrusion 14b of the arm receives a force in the outer circumferential direction, the arm moves along the guide groove 13c and is guided to the guide groove 13c. Push the ratchet pole 13e provided. When the protrusion 14b of the arm pushes the ratchet pole 13e, the ratchet pole 13e is locked by the ratchet wheel portion 12a formed on the driven wheel 12, and the intermediate wheel 1
3 and the driven wheel 12 are connected, and the driven wheel rotates as the drive wheel rotates. (Fourth step)

The above-described unidirectional rotation operation consisting of four steps is performed as one operation, but the interlocking operation between the intermediate wheel and the driven wheel and the idling state are selected according to the amount of clockwise rotation in the third step. It becomes possible to do. That is, only when the protrusion 14b of the arm is located at the entrance of the guide groove 13c at the stage of shifting from the third step to the fourth step, the intermediate wheel 13
And the driven wheel 12 are interlocked, and the driven wheel rotates as the drive wheel rotates.

[0010]

However, such a conventional clutch has the following drawbacks. (1) Since the driving wheel and the driven wheel are connected through the ratchet pole and the ratchet wheel, the operation time lag is large, and the arm length is long in this structure. Grows larger. (2) Moment load because the force is transmitted in the axial direction like the drive wheel → arm fulcrum → arm action point → ratchet pole → ratchet wheel, and the arm fulcrum and action point are not on the same plane. Therefore, the arm is easily damaged or bent, and the allowable load is small. (3) The feature of the cut sheet feeding mechanism is the time after the drive wheel and the driven wheel are connected (the time during which the cut sheet is fed).
Is much longer than the time before connection (time to start feeding cut paper), but the brake wound on the intermediate wheel is
After the drive wheel and the driven wheel are connected, they slip, which causes great wear, and it is necessary to devise a method for tightening the intermediate wheel, which complicates the separate brake. (4) Since the elastic resin portion 13d utilizes the elasticity of the resin, it is easily damaged by repeated bending fatigue,
Short life and poor reliability. (5) Since each constituent element is separated in the axial direction, it is easy to disassemble during assembly, and workability in assembling the clutch is poor.

[0011]

In order to eliminate the above drawbacks, the present invention has a guide groove formed of first to third guide groove portions on one surface, and a switching valve is provided between these guide groove portions. A drive wheel having a tapered wall surface of the third guide groove portion, a first shaft portion at which the elastic C-shaped ring is locked at a predetermined pressure, and the drive wheel are snap-fitted. Between a driven wheel and a driven wheel having a shaft member including a second shaft portion having a groove formed therein and a third shaft portion forming a wedge-shaped space by the tapered surface. The intermediate wheel, which is disposed and integrated with the elastic C-shaped ring, and the columnar portion formed at one end at a substantially right angle so as to move along the guide groove while receiving a force in the direction of the center of the intermediate wheel. An arm whose other end is supported by the intermediate wheel,
Provided is a clutch characterized in that the drive wheel is rotated to change the position of the columnar portion in a guide groove, and the columnar portion is sandwiched in the wedge-shaped space to connect the drive wheel and the driven wheel. To do.

[0012]

1 to 3 are views for explaining a first embodiment of the present invention. In these figures, 1 is a driving wheel, 2 is a driven wheel, 3 is an intermediate wheel disposed between the driving wheel and the driven wheel, and 4 is an arm.

The drive wheel 1 is provided with a guide groove consisting of a first guide groove portion 1a, a second guide groove portion 1b and a third guide groove portion 1c on a surface facing the intermediate wheel 3, and a third guide groove portion 1c.
Has a tapered surface 1d. A switching valve 1e is arranged between the guide groove portions. One end of the arm 4 is supported by the intermediate wheel 3 as a fulcrum 4a, and a columnar portion 4b formed substantially at the other end at a right angle is positioned in the guide groove as an action point so as to be movable according to the rotation of the drive wheel 1. Further, the columnar portion 4b always receives a force in the center direction of the intermediate wheel by a spring 4d arranged between the force point 4c of the arm and the intermediate wheel 3.

A switching valve 1 arranged between the guide grooves.
As for e, the cylindrical portion 4b of the arm is guided from the guide groove portions 1b, 1c to 1
When moving to a, it is pushed by the cylindrical portion 4b of the arm so that it rotates and opens around the fulcrum 1f, and when moving from the guide groove portion 1a to 1b, the cylindrical portion 4b of the arm is pushed by the cylindrical portion 4b of the arm. Between the switching valve 1e and the drive wheel 1 so as to rotate and open around the fulcrum 1f and close the passage to the guide groove 1c, and to return to the original position after passing through the arm column 4b. Spring 1 arranged in
supported by g. The spring 1g may be attached not only to the surface of the drive wheel where the guide groove is formed, but also to the surface where the guide groove is not formed.

The driven wheel 2 is for snap-fitting the drive shaft 1 and the first shaft portion 2a on which the elastic C-shaped ring 3b having the convex portion 3a is locked at a predetermined pressure at a predetermined pressure. The second shaft portion 2b having the groove 2d formed therein and the tapered surface 1d of the guide groove portion 1c of the driving wheel form a wedge-shaped space.
And a shaft member composed of the shaft portion 2c. Therefore, the second
After the shaft portion 2b and the inner diameter portion of the drive wheel 1 are snap-fitted and the groove 2d of the second shaft portion and the inner diameter portion of the drive wheel 1 are loosely fitted, the drive wheel 1, the intermediate wheel 3 , And driven wheel 2
Does not decompose. A concave portion 3c is formed in the intermediate wheel 3, and the concave portion 3c is fitted with the convex portion 3a of the elastic C-shaped ring, whereby the intermediate wheel 3 and the elastic C-shaped ring 3b are integrated. Therefore, the intermediate wheel 3 has the elastic C-shaped ring 3b.
The first wheel 2a of the driven wheel is engaged with the first wheel 2a with a predetermined pressure, and the intermediate wheel does not rotate until a rotational force of a predetermined value or more acts on the intermediate wheel.

First, when the drive wheel 1 is rotated clockwise,
Since the columnar portion 4b of the arm located in the guide groove is supported by the intermediate wheel 3 whose fulcrum 4a of the arm does not rotate and the guide groove is formed on the rotating drive wheel 1, its position Move along the guide groove that is Here, FIG. 3A shows a case where the columnar portion 4b of the arm is located in the guide groove portion 1c. The columnar portion 4b of the arm located in the guide groove portion 1a moves as it is, and the guide groove portions 1b, 1
The cylindrical portion 4b of the arm located at c is shown in FIG.
, Press the switching valve 1e to switch the switching valve 1e.
Is rotated about the fulcrum 1f, opened, passes, and moves to the guide groove 1a. The cylindrical portion 4b of the arm is the guide groove portion 1
When moving to a, the switching valve 1e returns to the original position as shown in FIG. 3 (c). In this way, when the cylindrical portion 4b of the arm reaches the one end of the guide groove portion 1a, the intermediate wheel 3
Rotate clockwise. In this state, since the elastic C-shaped ring 3b and the driven wheel 2 are slipping, the intermediate wheel 3 and the driven wheel 2 are idling and the driven wheel does not rotate. (First step)

Next, when the drive wheel 1 is rotated counterclockwise, the columnar portion 4b of the arm moves along the guide groove portion 1a, and as shown in FIG. 3 (d), the switching valve 1e is pushed to switch the switching valve 1e. 1e is rotated about the fulcrum 1f, opened, passes, and moves to the guide groove portion 1b. At this time, the cylindrical portion 4b of the arm receives a force in the direction of the center of the intermediate wheel by the spring 4d arranged between the force point 4c of the arm and the intermediate wheel 3, and therefore tries to move to the guide groove portion 1c. (D), the switching valve 1e closes the passage to the guide groove portion 1c.
Do not move to c. The cylindrical portion 4b of the arm is the guide groove portion 1b.
When moved to, the switching valve 1e returns to the original position as shown in FIG. When the cylindrical portion 4b of the arm moves along the guide groove portion 1b and reaches the other end of the guide groove portion 1b, the intermediate wheel 3 is rotated counterclockwise. Even in this state, since the elastic C-shaped ring 3b and the driven wheel 2 are slipping, the intermediate wheel 3 and the driven wheel 2 are idling and the driven wheel does not rotate. (Second step)

Next, the drive wheel 1 is rotated clockwise to move the columnar portion 4b of the arm along the guide groove portion 1b to the entrance of the guide groove portion 1c, as shown in FIG. 3 (f). (Third step)

Next, when the drive wheel 1 is rotated counterclockwise, the arm cylinder 4b is forced to move toward the arm force point 4c and the intermediate wheel 3.
Since the spring 4d arranged therebetween receives a force in the direction of the center of the intermediate wheel, the columnar portion 4b of the arm moves along the guide groove portion 1c. The cylindrical portion 4b of the arm is shown in FIG.
As shown in FIG. 2, when the drive wheel 1 and the driven wheel 2 are locked by the wedge-shaped space formed by the tapered surface 1d of the drive wheel and the third shaft portion 2c of the driven wheel, the drive wheel 1 and the driven wheel 2 are connected to each other, and The driven wheel rotates as it rotates. (Fourth step)

The unidirectional rotation operation consisting of the four steps as described above is performed as one operation, but the driving wheel and the driven wheel are interlocked with each other and the idling state is selected depending on the amount of clockwise rotation in the third step. It becomes possible to do. That is, only when the columnar portion 4b of the arm is located at the entrance of the guide groove portion 1c at the stage of shifting from the third step to the fourth step, the drive wheel 1 and the driven wheel 2 are connected to rotate the drive wheel. The driven wheel rotates accordingly.

FIG. 4 is a diagram for explaining the second embodiment of the present invention. In this embodiment, the third shaft portion 2 of the driven wheel is used.
By forming the tooth portion 2e on c, the holding torque is increased. Others are similar to those described in the first embodiment, and similar effects can be obtained.

FIG. 5 and FIG. 6 are views for explaining the third embodiment of the present invention. In this embodiment, the driven wheel 2 has an inner diameter surface 2 instead of the third shaft portion 2c in the first embodiment.
f is formed, and a wedge-shaped space is formed by the inner diameter surface 2f and the tapered surface 1d formed on the wall surface of the third guide groove portion 1c of the drive wheel 1. Further, in this embodiment, the position of the force point 4c of the arm is changed from that of the first embodiment so that the cylindrical portion 4b always receives the force in the outer circumferential direction of the intermediate wheel.

First, when the drive wheel 1 is rotated clockwise,
Since the columnar portion 4b of the arm located in the guide groove is supported by the intermediate wheel 3 whose fulcrum 4a of the arm does not rotate and the guide groove is formed on the rotating drive wheel 1, its position Move along the guide groove that is The arm cylindrical portion 4b located in the guide groove portion 1a moves as it is, and the arm cylindrical portion 4 located in the guide groove portions 1b and 1c.
b, press the switching valve 1e to set the switching valve 1e to the fulcrum 1
Rotate around f, open and pass through the guide groove 1a
Move to. When the columnar portion 4b of the arm moves to the guide groove portion 1a, the switching valve 1e returns to the original position. In this way, when the cylindrical portion 4b of the arm reaches the one end of the guide groove portion 1a, the intermediate wheel 3 is rotated clockwise. In this state, since the elastic C-shaped ring 3b and the driven wheel 2 are slipping, the intermediate wheel 3 and the driven wheel 2 are idling and the driven wheel does not rotate. (First step)

Next, when the drive wheel 1 is rotated counterclockwise, the columnar portion 4b of the arm moves along the guide groove portion 1a and pushes the switching valve 1e to push the switching valve 1e to the fulcrum 1f.
Is rotated about the center of the arrow to open, pass, and move to the guide groove 1b. At this time, the columnar portion 4b of the arm receives a force in the outer circumferential direction of the intermediate wheel by the spring 4d arranged between the force point 4c of the arm and the intermediate wheel 3, so that it tries to move to the guide groove portion 1c. Since the switching valve 1e closes the passage to the guide groove portion 1c, the columnar portion 4b of the arm is fixed to the guide groove portion 1c.
Do not move to c. The cylindrical portion 4b of the arm is the guide groove portion 1b.
When moved to, the switching valve 1e returns to the original position.
When the cylindrical portion 4b of the arm moves along the guide groove portion 1b and reaches the other end of the guide groove portion 1b, the intermediate wheel 3 is rotated counterclockwise. Even in this state, since the elastic C-shaped ring 3b and the driven wheel 2 are slipping, the intermediate wheel 3 and the driven wheel 2 are idling and the driven wheel does not rotate. (Second step)

Next, the drive wheel 1 is rotated in the clockwise direction so that the column portion 4b of the arm is guided along the guide groove portion 1b.
Move to the entrance. (Third step)

Next, when the drive wheel 1 is rotated in the counterclockwise direction, the arm column portion 4b is moved to the arm force point 4c and the intermediate wheel 3.
Since the spring 4d arranged in between receives the force in the outer circumferential direction of the intermediate wheel, the columnar portion 4b of the arm is guided by the guide groove portion 1a.
Move along c. When the columnar portion 4b of the arm is caught in the wedge-shaped space formed by the tapered surface 1d of the drive wheel and the inner diameter surface 2f of the driven wheel and cannot move, the drive wheel 1 and the driven wheel 2 are connected to rotate the drive wheel. The driven wheel rotates accordingly. (Fourth step)

The unidirectional rotation operation consisting of the above-described four steps is performed as one operation, but the driving wheel and the driven wheel are interlocked with each other and the idling state is selected according to the amount of clockwise rotation in the third step. It becomes possible to do. That is, only when the columnar portion 4b of the arm is located at the entrance of the guide groove portion 1c at the stage of shifting from the third step to the fourth step, the drive wheel 1 and the driven wheel 2 are connected to rotate the drive wheel. The driven wheel rotates accordingly.

7 and 8 are views for explaining the fourth embodiment of the present invention. In these embodiments, the length of the switching valve 1e is made longer than that of the first and third embodiments, and when the switching valve 1e is rotated to the guide groove portion 1a side or the guide groove portion 1b side, the guide groove portion 1a side , Or the guide groove portion 1b side, and the guide groove portion 1a
Side or the guide groove portion 1 so that the columnar portion 4b of the arm can get over the switching valve 1e protruding toward the guide groove portion 1b.
The width of a and 1b is widened to eliminate the need for the spring 1g.

With this configuration, in the first step, the columnar portion 4b of the arm is guided by the guide groove portions 1b and 1c.
When moving from the guide groove portion 1a to the guide groove portion 1a, the switching valve 1e protruding toward the guide groove portion 1b is raised while the guide groove portion 1a is being raised.
Switching valve 1 which is rotated to the side and protrudes to the guide groove 1a side
It goes over e and moves to the guide groove 1a. Further, in the second step, when the arm column portion 4b moves from the guide groove portion 1a to the guide groove portion 1b, the arm column portion 4b is moved.
Rotates to the guide groove portion 1b side while raising the switching valve 1e protruding toward the guide groove portion 1a, and moves over to the guide groove portion 1b over the switching valve 1e protruding toward the guide groove portion 1b side. At this time, since the columnar portion 4b of the arm receives a force in the center direction of the intermediate wheel or in the outer circumferential direction, it tries to move to the guide groove portion 1c, but the switching valve 1e closes the passage to the guide groove portion 1c. Therefore, the cylindrical portion 4b of the arm
Does not move to the guide groove 1c. Further, in the third step, the columnar portion 4b of the arm moves to the inlet of the guide groove portion 1c while raising the switching valve 1e protruding toward the guide groove portion 1b. Others are similar to those described in the first embodiment, and similar effects can be obtained.

9 and 10 are diagrams for explaining the fifth embodiment of the present invention. Although the third guide groove portion having the tapered surface is provided at one place in the above embodiments, in these embodiments, the guide groove portion 1c ′, the tapered surface 1d ′ and the guide groove portion 1c are provided on the guide groove portions 1a and 1b side, respectively. By forming the tapered surface 1d, the drive wheel and the driven wheel are connected regardless of whether the drive wheel 1 is rotated clockwise or counterclockwise as needed. When using the guide groove portion 1c 'and the tapered surface 1d', the first
If the guide groove portion is read as 1b and the second guide groove portion is read as 1a, the operation from the first step to the fourth step is the same as that described in the first embodiment. With this configuration, the range of uses of the clutch can be further expanded.
When attaching the spring 1g to the switching valve 1e,
In order not to hinder the movement of the cylindrical portion 4b of the arm, it is necessary to mount it on the surface opposite to the surface where the guide groove of the drive wheel is formed.

[0031]

As described above, according to the present invention, the following effects can be obtained. (1) Since the arm arranged on the intermediate wheel is sandwiched by the wedge-shaped space formed by the driving wheel and the driven wheel to connect the driving wheel and the driven wheel, the operation time lag is small and the arm length is long. Since the length may be short, the outer diameter can be reduced. (2) Since the power points of the driving wheel, the arm, and the driven wheel are on the same plane, a moment load is not applied and a high load can be accommodated. (3) The elastic C-shaped ring integrated with the intermediate wheel locked to the first shaft portion of the driven wheel is between the first shaft portion of the driven wheel after the drive wheel and the driven wheel are connected. Since it does not slip, the amount of slippage is extremely small compared to the conventional clutch, and the elastic C-type ring, which is a brake, can have a simple mechanism. (4) Since the switching valve that opens with the passage of the arm is arranged on the drive wheel, it is not necessary to use the elasticity of the resin,
High durability against repetition. (5) Since the drive wheel and the driven wheel are locked by the snap fit, the respective constituent elements are not separated and workability at the time of assembling the clutch is good. (6) It is possible to control not only the movement in one direction but also the movement in two directions.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a first embodiment of the present invention.

FIG. 2 is a diagram for explaining the first embodiment of the present invention.

FIG. 3 is a diagram for explaining the first embodiment of the present invention.

FIG. 4 is a diagram for explaining a second embodiment of the present invention.

FIG. 5 is a diagram for explaining a third embodiment of the present invention.

FIG. 6 is a diagram for explaining a third embodiment of the present invention.

FIG. 7 is a diagram for explaining the fourth embodiment of the present invention.

FIG. 8 is a diagram for explaining the fourth embodiment of the present invention.

FIG. 9 is a diagram for explaining a fifth embodiment of the present invention.

FIG. 10 is a diagram for explaining the fifth embodiment of the present invention.

FIG. 11 is a diagram for explaining a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Driving wheel 1a ... 1st guide groove part 1b ... 2nd guide groove part 1c, 1c '...
Third guide groove portions 1d, 1d '... Tapered surface 1e ... Switching valve 1f ... Switching valve fulcrum 1g ... Spring 2 ... Driven wheel 2a ... First shaft portion 2b ... Second shaft portion 2c ... Third shaft portion 2d ... Groove 2e ... Tooth portion 2f ... Inner surface 3 ... Intermediate wheel 3a ... Convex portion 3b ... Elastic C-shaped ring 3c ... Recessed portion 4 ... Arm 4a ... Arm fulcrum 4b ... Cylindrical portion 4c ... Arm force point 4d ... Spring 11 ... Drive wheel 12 ... Driven wheel 12a ... Ratchet wheel portion 13 ... Intermediate wheels 13a, 13b, 13c ... Guide groove portion 13d ... Elastic resin portion 13e ... Ratchet pole 13f ... Spring 14 ... Arm 14a ... Arm fulcrum 14b ... Projection portion 14c ... Spring 15 ... Brake

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16D 41/00-47/06 B41J 11/00-15/24 B65H 1/00-85/00

Claims (6)

(57) [Claims] 1. A guide groove composed of first to third guide groove portions is formed on one surface, a switching valve is arranged between these guide groove portions, and a wall surface of the third guide groove portion is a tapered surface. Drive wheel, a first shaft portion at which the elastic C-ring is locked at a predetermined pressure, a second shaft portion having a groove for snap-fitting the drive wheel, and the taper. A driven wheel having a shaft member composed of a third shaft portion forming a wedge-shaped space with the surface, and an intermediate wheel disposed between the drive wheel and the driven wheel and integrated with the elastic C-ring. And an arm whose other end is supported by the intermediate wheel so that a columnar portion formed at one end at a substantially right angle can move along the guide groove while receiving a force in the center direction of the intermediate wheel,
A clutch characterized in that the position of the columnar portion in the guide groove is changed by the rotation of the drive wheel, and the columnar portion is sandwiched in the wedge-shaped space to connect the drive wheel and the driven wheel. 2. The clutch according to claim 1, wherein a tooth portion is formed on the third shaft portion. 3. A guide groove composed of first to third guide groove portions is formed on one surface, a switching valve is arranged between these guide groove portions, and a wall surface of the third guide groove portion is a tapered surface. And a second shaft portion having a groove in which the drive wheel is snap-fitted, and a first shaft portion in which the elastic C-shaped ring is locked by a predetermined pressure. A driven wheel having a member and an inner diameter surface forming a wedge-shaped space by the tapered surface; an intermediate wheel disposed between the drive wheel and the driven wheel and integrated with the elastic C-ring; A columnar portion formed at one end at a substantially right angle is provided with an arm whose other end is supported by the intermediate wheel so as to be able to move along the guide groove while receiving a force in the outer circumferential direction of the intermediate wheel, The rotation of the drive wheel changes the position of the cylinder in the guide groove, A clutch characterized in that the drive wheel and the driven wheel are connected by sandwiching a portion in the wedge-shaped space. 4. The switching valve is characterized in that
The columnar part moves from the first guide groove part to the second guide groove part so that when it is moved from the third guide groove part to the first guide groove part, it is pushed by the columnar part to rotate and open around the fulcrum. The clutch according to claim 1 or 3, wherein the clutch is supported so as to be pushed by a columnar portion to rotate around a fulcrum and open when closing, and to close a passage to the third guide groove portion. 5. The intermediate wheel has a recess formed therein,
4. The intermediate wheel and the elastic C-shaped ring are integrated with each other by fitting the concave portion with a convex portion formed on the elastic C-shaped ring. clutch. 6. The third guide groove portion is formed on the first and second guide grooves.
The clutch according to claim 1 or 3, wherein the guide grooves are formed on both sides of the guide groove.