JP2000074255A - Two-shaft rotating device by one operating shaft - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two-shaft rotating device by one operating shaft, capable of automatically rotating two shafts on the basis of the proper operating order only by specifying the rotational direction of one operating shaft without considering the operating order. SOLUTION: The input side 40A of an operating shaft 40 is rotated in the valve opening direction R1 in the off state of a clutch 33, an internal thread piece 36 is advanced by the rotation of an auxiliary shaft side lead screw shaft 34, a pin 39 is made to interfere with a slit 42, an auxiliary shaft side turning arm 32 is turned, and an auxiliary valve element is opened. Next, a clutch lever 44 is made to interfere with the internal thread piece 36, the clutch 33 is turned on, a main shaft side worm wheel 31 is rotated, and a main valve element is opened. Moreover, the input side 40A is turned in the valve closing direction, the main shaft side worm wheel 31 is reversely rotated, and the main valve element is closed. Moreover, the auxiliary valve element is closed by the reversal rotation of the auxiliary shaft side lead screw shaft 34 and the reverse turning movement of the auxiliary shaft side turning arm 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-shaft rotary device having one operation shaft suitable for an opening / closing device for a butterfly valve with a built-in auxiliary valve.

[0002]

2. Description of the Related Art As shown in FIGS. 9 to 11, a butterfly valve with a built-in sub-valve comprises a valve box 1, a main valve body 2 housed in the valve box 1 so as to be openable and closable, and a main valve body 2. A sub-valve element 3 is provided so as to be openable and closable. An upper valve rod 4 and a lower valve rod 5 are fixed to the main valve body 2. The upper valve stem 4 is a cylindrical member provided with a through hole 6 in the direction of the axis C, and is rotatably and air-tightly supported around the axis C by the upper shaft support 7 of the valve box 1 so as to be above the upper shaft support 7. It is protruding. The lower valve stem 5 is rotatably and air-tightly supported around an axis C by a lower shaft supporting portion 8 of the valve box 1, and the axis C of the upper valve stem 4 and the lower valve stem 5.
The main valve body 2 opens and closes the passage of the valve box 1 by the rotation in the forward and reverse directions.

An upper valve rod 9 and a lower valve rod 10 are fixed to the sub-valve element 3, and the upper valve rod 9 is rotatable about an axis C by an upper shaft support 12 of an auxiliary valve box 11 provided on the main valve element 2. And is airtightly supported and protrudes above the upper shaft support 12. The lower valve stem 10 is rotatably and air-tightly supported around an axis C by a lower shaft support portion 13 of the sub-valve case 11.

A shaft 14 having an upper end protruding above the upper valve rod 4 is inserted through a through hole 6 provided in the upper valve rod 4 of the main valve body 2 in the direction of the axis C so as to be rotatable about the axis C. , This axis 14
And the upper end of the upper valve rod 9 of the sub-valve 3 are connected to each other via a coupling 15 so as to be able to rotate simultaneously.

[0005] A biaxial rotating device 17 is mounted on the upper shaft support 7 of the valve box 1 via a stand 16. The two-axis rotating device 17 uses the two operation shafts 18 and 19 to rotate the main valve body 2.
A first gear case 20 having an axis concentric with the axis C, and a first gear case 20 having an axis concentric with the axis C. A lower end of the first gear case 20 is fixed to the stand 16, and an upper end opening of the first gear case 20 is detachably closed by a cover 22.

The one operating shaft 18 is connected to the upper valve rod 4 of the main valve body 2.
To rotate in the forward and reverse directions around the axis C,
As shown in FIGS. 12 and 13, the second gear case 21
Is rotatably and airtightly supported around an axis C1 by a shaft support portion 23 provided at one end thereof, and protrudes above the shaft support portion 23. The rotation of one operation shaft 18 around the axis C1 is performed by a bevel pinion 24A, It is transmitted to a horizontal worm shaft 25 via a gear train 24 such as a bevel gear 24B, a pinion 24C, a spur gear 24D, and the like.
Is rotated via a worm 26 provided on the worm shaft 25 through a worm wheel 27 having an axis concentric with the axis C.
Is transmitted to The worm wheel 27 is fixed to a wheel boss 28 rotatably supported around the axis C by the first gear case 20 and the cover 22, and a central hole 28 </ b> A of the wheel boss 28 is provided at an upper end of the upper valve rod 4 of the main valve body 2. And are coupled so as to be simultaneously rotatable by, for example, a key (not shown).

The other operating shaft 19 is for rotating the upper valve stem 9 of the sub-valve 3 via the shaft 14 and the coupling 15 in the forward and reverse directions around the axis C, as shown in FIG. , Which is rotatably and air-tightly supported around an axis C by a stem cover 29 which detachably closes a center hole 22A of the cover 22 and protrudes above the stem cover 29, and is provided on the other operation shaft 19. The upper end of the shaft 14 is fitted into the blind through-hole 30 in the direction of the axis C, and is coupled to be rotatable simultaneously by, for example, a taper pin (not shown).

In the above construction, the main valve body 2 and the sub-valve element 3 are fully opened from the valve-closing state of the sub-valve built-in type butterfly valve in which the main valve element 2 and the sub-valve element 3 are fully closed. The procedure for obtaining the open state of the butterfly valve will be described.

First, the other operation shaft 19 is rotated in the valve opening direction (for example, counterclockwise on the projection plane). This rotation is transmitted to the upper valve rod 9 of the sub-valve 3 via the shaft 14 and the coupling 15, and simultaneously rotates the upper valve rod 9, the sub-valve 3 and the lower valve rod 10 in the valve opening direction. The sub-valve 3 can be fully opened.

When the differential pressure between the upstream side and the downstream side of the valve box 1 becomes small due to the full opening of the sub-valve element 3, the one operating shaft 1
8 is the valve opening direction (for example, counterclockwise on the projection plane)
Rotate to. This rotation is transmitted to the upper valve stem 4 of the main valve body 2 through a gear train 24 such as a bevel pinion 24A, a bevel gear 24B, a pinion 24C, a spur gear 24D, a worm shaft 25, a worm 26, a worm wheel 27, and a wheel boss 28. By rotating the upper valve stem 4, the main valve stem 2 and the lower valve stem 5 simultaneously in the valve opening direction, the main valve stem 2 can be fully opened.

Next, the main valve body 2 and the sub-valve element 3 are fully closed from the valve-open state of the sub-valve-incorporated type butterfly valve in which the main valve element 2 and the sub-valve element 3 are fully opened. The procedure for obtaining the closed state of the butterfly valve will be described.

First, one operation shaft 18 is rotated in a valve closing direction (for example, clockwise on a projection plane). This rotation is transmitted to the upper valve stem 4 of the main valve body 2 through a gear train 24 such as a bevel pinion 24A, a bevel gear 24B, a pinion 24C, a spur gear 24D, a worm shaft 25, a worm 26, a worm wheel 27, and a wheel boss 28. ,
The upper valve stem 4, the main valve body 2 and the lower valve stem 5 can be simultaneously rotated in the valve closing direction to fully close the main valve body 2.

After the main valve body 2 is fully closed, the passage of fluid from the upstream side to the downstream side of the valve box 1 is greatly restricted, and then the other operation shaft 19 is moved in the valve closing direction (for example, clockwise on the projection plane). Around). This rotation is transmitted to the upper valve rod 9 of the sub-valve 3 via the shaft 14 and the coupling 15, and simultaneously rotates the upper valve rod 9, the sub-valve 3 and the lower valve rod 10 in the valve closing direction, The sub-valve 3 can be fully closed.

As described above, in the butterfly valve with a built-in sub-valve, the operation order of the main valve body 2 and the sub-valve body 3 from the valve closed state to the valve open state is as follows. Opening of the sub-valve body 3 by rotating the other operation shaft 19,. The operation of the main valve 2 and the sub-valve 3 from the valve open state to the valve closed state is performed by opening the valve of the main valve body 2 by rotating one of the operation shafts 18. The valve closing of the main valve body 2 by the rotation operation of one operation shaft 18,. This is performed by closing the valve of the sub-valve body 3 by rotating the other operation shaft 19.

[0015]

For this reason, in a conventional two-shaft rotating device having two operating shafts, two operating shafts are specified each time the main valve and the sub-valve are opened and closed. Must be rotated in the valve opening or valve closing direction in the order described, which has the disadvantage of cumbersome operation, and improper operation sequence significantly increases the operating force at the time of valve opening and valve closing, It has a drawback that smooth opening and closing of the valve are hindered.

Accordingly, the present invention provides a method of automatically rotating two axes based on an appropriate operation order simply by specifying the rotation direction of one operation axis without considering the operation order. It is an object of the present invention to provide a two-axis rotating device using one operation shaft, which can facilitate the operation and can avoid an erroneous operation sequence.

[0017]

In order to achieve the above object, a two-axis rotating device with one operating shaft according to the present invention is provided.
A main shaft and a sub-shaft inserted into the main shaft along the main shaft are rotated in a specified order in the normal and reverse directions around the main shaft by rotation of one operation shaft. A shaft rotating device, comprising: a main shaft side worm wheel provided so as to be able to rotate simultaneously with the main shaft; and a counter shaft side turning arm provided so as to be able to rotate simultaneously with the sub shaft so as to face the main shaft side worm wheel. And a clutch rotatably supported having an axis intersecting the axes of the main shaft and the countershaft, and intermittently transmitting and receiving power from an input side to an output side, and the main shaft side worm is provided at the output side. 1 with a worm that meshes with the wheel so that it can rotate simultaneously
One operating shaft, a sub-shaft-side lead screw shaft rotatably provided in parallel with the one operating shaft and having an external thread provided on the outer periphery, and a rotation of the input shaft of the one operating shaft on the sub-shaft-side lead screw shaft. And a female screw portion that is screwed to a male screw on the outer periphery of the counter shaft side lead screw shaft, and follows the first and second rotation directions on the input side of the one operation shaft. A female screw top that moves forward and backward in the axial direction of the lead screw shaft on the counter shaft side, and one connecting portion provided on the female screw top, and the turning shaft on the counter shaft side has an input side of the one operation shaft. When the female screw cope follows the rotation of the counter shaft side lead screw shaft accompanying the rotation in the first direction, it interferes with the one connecting portion to rotate the counter shaft side turning arm, and simultaneously rotates the counter shaft. And the second direction on the input side of the one operation axis. Interfere with the one interlocking portion during retraction of the internal thread piece to follow the accompanying rotation to reverse rotation of the auxiliary shaft side lead screw shaft is reversely pivoting the sub axis side pivot arm,
At the same time, the other connecting portion for reversely rotating the sub-shaft is provided, and from the latter half of the advancement of the female screw top to the first half of retreat, it interferes with the female screw top to turn the clutch `` ON '', and the first half of the advancement of the female screw top In the latter half of retreat, the interference with the female screw top is released and the clutch is turned "OFF".
It is characterized in that a clutch lever for causing the clutch lever is provided.

According to the present invention, by rotating one operation shaft in the first direction, the lead screw shaft on the countershaft side is rotated via the rotation transmission mechanism, and the female screw top is advanced and provided on the female screw top. The other connecting portion interferes with the other connecting portion of the countershaft-side turning arm to turn the countershaft-side turning arm, and rotates the countershaft with this turning. Since the clutch lever does not interfere with the female screw top during the first half of the advance of the female screw top,
Since the clutch is in the “OFF” state, the output side of one operating shaft, the worm, the worm wheel on the main shaft side, and the main shaft are stopped.

By continuing the rotation of one operating shaft in the first direction, the sub-shaft continues to rotate, and the clutch lever interferes with the female screw top during the latter half of the advance of the female screw top, and the clutch is released. ON ". As a result, the output side of one operation shaft, the worm, the worm wheel on the main shaft side, and the main shaft can be rotated.

In the above state, one operation shaft is
By rotating in the direction, the lead screw shaft on the counter shaft side rotates in the reverse direction via the rotation transmission mechanism, and the female screw top retreats, and one connecting portion provided on the female screw top connects to the other connection of the counter shaft side turning arm. The counter-shaft-side turning arm is caused to reversely rotate by interfering with the section, and the counter-shaft is reversely rotated with the reverse rotation. During the first half of retraction of the female screw top, the clutch lever interferes with the female screw top, and the clutch is in the “ON” state.
The output side of the two operating shafts, the worm, the worm wheel on the main shaft side and the main shaft can be rotated in reverse to return the main shaft to the original position.

Further, by continuing to rotate the one operation shaft in the second direction, the sub shaft is continuously rotated in the reverse direction and returns to the original position. In the latter half of retraction of the female screw top, the clutch is off because the clutch lever does not interfere with the female screw top.
, The output side of one operating shaft, the worm, the worm wheel on the main shaft side, and the main shaft are stopped.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, in which the present invention is applied to an opening / closing device for a butterfly valve with a built-in sub-valve in the same manner as in the prior art. Therefore, the structure of the valve box 1, the main valve body 2, the sub-valve body 3, the upper valve rods 4, 9, the lower valve rods 5, 10, the shaft 14 and the like are the same as those of the conventional example. The same or corresponding parts as in the conventional example of FIGS. 9 to 13 are denoted by the same reference numerals.

FIG. 1 is a plan view of an embodiment of the present invention when a main valve body and a sub-valve body are closed, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. It is a side view. In these figures, the biaxial rotating device 17 has a main shaft side worm wheel 31, a sub shaft side swivel arm 32, an axis crossing the axis of the upper valve rod 4 and the shaft 14, and is rotatable on a casing 41. And is divided into an input side 40A and an output side 40B via a clutch 33.
And a single operation shaft 40 provided with a worm 42 on the OB.

The upper end of the upper valve rod 4 of the main valve body 2 is fitted to the boss-like base 31A of the main shaft side worm wheel 31, and is coupled to each other by a key (not shown) so as to be simultaneously rotatable. Further, the upper end of the shaft 14 is fitted to the counter-shaft-side turning arm 32 and is coupled to be rotatable simultaneously by a key (not shown).

The casing 41 has a male screw 34A on the outer periphery.
Is provided so as to be rotatable in parallel with one operation shaft 40, and the rotation of the input side 40 </ b> A of one operation shaft 40 is controlled by the rotation transmission mechanism 35 to rotate the sub-shaft lead screw. It is transmitted to the shaft 34. The rotation transmission mechanism 3
Reference numeral 5 includes a drive gear 35A fixed to the input side 40A of one operation shaft 40, an intermediate gear 35B, and a driven gear 35C fixed to the countershaft side lead screw shaft 34.

Male screw 3 on the outer periphery of the lead screw shaft 34 on the counter shaft side
Female screw top 36 having female screw portion 36A screwed to 4A
Is provided. At one end of the female screw top 36,
A guide 37 provided in parallel with the countershaft side lead screw shaft 34 penetrates slidably. Accordingly, the female screw top 36 moves forward and backward in the axial direction of the countershaft-side lead screw shaft 34 following the forward / reverse rotation of the countershaft-side lead screw shaft 34.

On the other hand, the female screw top 36 is provided with one connecting portion 38 formed by pins projecting upward. Also, one connecting portion 3 is attached to the counter shaft side turning arm 32.
The other connecting portion 39, which is mainly formed in the shape of an arc and is formed by a slit which slidably passes through the connecting portion 8, penetrates in the thickness direction.

On the other hand, a fulcrum of a clutch lever 44 is pivotally connected to the pin 43. The point of action of the clutch lever 44 is engaged with the clutch 33, and the point of force faces the path of the female screw top 36. Therefore, from the latter half of the forward movement of the female screw top 36 to the first half of the backward movement thereof, the force point of the clutch lever 44 interferes with the female screw top 36, and the clutch 33 is moved to "O".
N ", the interference between the female screw top 36 and the force point of the clutch lever 44 is released in the first half of the forward movement and the second half of the backward movement of the female screw top 36, and the clutch 33 is turned" OFF ".

A procedure for fully opening the main valve body 2 and the sub-valve element 3 from the valve-closed state of the sub-valve built-in butterfly valve in which the main valve element 2 and the sub-valve element 3 are fully closed will be described. .

The main valve body 2 and the auxiliary valve body 3 shown in FIGS.
Is fully closed, the spindle-side worm wheel 31
The self-locking function caused by meshing with the worm 42 prevents the swing of the main valve body 2 due to the load of the fluid, and the other connecting portion 39 is inserted into the one connecting portion 38 to thereby make the sub shaft-side swing arm 32 The self-locking function that restrains the turning of the valve prevents the swing of the sub-valve body 3 due to the load of the fluid.

In this state, the input side 40 of one operating shaft 40
When A is rotated in the valve opening direction R1, this rotation is transmitted to the counter shaft side lead screw shaft 34 via the rotation transmission mechanism 35,
As the counter shaft side lead screw shaft 34 rotates, the female screw top 36 advances, and one connecting portion 38 provided on the female screw top 36 interferes with the other connecting portion 39 of the counter shaft side turning arm 32, and The side turning arm 39 is turned to the position shown in FIG. 5, and the shaft 14 is rotated by 90 degrees around the axis with this turning, and the sub-valve 3 is opened as shown in FIG. Female screw top 36
During the forward movement from the position shown in FIG. 1 to the position shown in FIG. 5, the force point of the clutch lever 44 does not interfere with the female screw top 36, and the clutch is in the “OFF” state. 40 output side 40B, worm 4
2. The main shaft side worm wheel 31, the upper valve rod 4, and the main valve body 2 are stopped.

When the rotation of the input side 40A of one operating shaft 40 in the valve opening direction R1 is continued in a state where only the sub-valve element 3 shown in FIGS. As the female screw top 34 rotates, the female screw top 36 advances, and one connecting portion 38 provided on the female screw top 36 interferes with the other connecting portion 39 of the counter shaft side turning arm 32 to move the sub shaft side turning arm 39 in FIG. And the shaft 14 is rotated by 90 degrees around the axis. The advance of the female screw top 36 at this time causes the force of the clutch lever 44 to interfere with the female screw top 36, and the clutch 33 is set to “O”.
N ". Thereby, the output side 40B of one operation shaft 40, the worm 42, and the main shaft side worm wheel 3
By rotating the upper valve stem 1 and the upper valve rod 4, the main valve body 2 can be opened as shown in FIG. The state shown in FIG. 8 is maintained by the self-lock function described above.

On the other hand, when the input side 40A of one operation shaft 40 is rotated in the valve closing direction R2 in the state shown in FIGS. 7 and 8, this rotation is transmitted to the input side 40B via the clutch 33, and Reverse the input side 40B. Further, the rotation of the input side 40A in the valve closing direction R2 is transmitted to the countershaft-side lead screw shaft 34 via the rotation transmitting mechanism 35, and reversely rotates the countershaft-side lead screw shaft 34. By the reverse rotation of the counter shaft side lead screw shaft 34, the female screw top 36 is retracted,
One connecting portion 38 provided on the female screw top 36 interferes with the other connecting portion 39 of the counter shaft side turning arm 32 to turn the counter shaft side turning arm 39 backward to the position shown in FIG. The shaft 14 is reversely rotated 90 degrees around the axis. While the female screw top 36 is moving backward from the position shown in FIG. 7 to the position shown in FIG. 5, the force point of the clutch lever 44 interferes with the female screw top 36 and the clutch is in the “ON” state. Output side 40B of two operating shafts 40, worm 42,
The main shaft side worm wheel 31 and the upper valve rod 4 rotate in the reverse direction to close the main valve body 2 as shown in FIG.

The counter-shaft-side swing arm 32 swings backward from the position shown in FIG. 7 to the position shown in FIG. 5, and as shown in FIG.
When the rotation of the input side 40A of one operating shaft 40 in the valve closing direction R2 is continued in a state where the valve is closed and the sub-valve element 3 is opened, the reverse rotation of the sub-shaft worm shaft 34 and the female screw 36 continues to retreat, and one connecting portion 38 provided on the female screw top 36 interferes with the other connecting portion 39 of the countershaft-side turning arm 32 to cause the countershaft-side turning arm 39 to turn back to the position shown in FIG. With this rotation, the shaft 14 is reversely rotated 90 degrees around the axis, and the sub-valve 3 is closed as shown in FIG. When the female screw top 36 is retracted, the force point of the clutch lever 44 does not interfere with the female screw top 36, so that the clutch 33 is in the "OFF" state. As a result, the output side 40B of one operating shaft 40, the worm 42, the main shaft side worm wheel 31, and the upper valve stem 4 are stopped, and the main valve body 2 is closed.

As described above, the rotation direction of one operating shaft 40 is specified simply without considering the opening / closing operation sequence of the main valve body 2 and the sub-valve body 3, and the main valve body 2 and the sub-valve body 3 are automatically determined based on the opening / closing operation sequence. By rotating the two axes of the upper valve stem 9 of the sub-valve element 3 via the upper valve stem 4 and the shaft 14 of the valve element 2, the main valve element 2 and the sub-valve element 3 can be opened and closed in a specified order. Therefore, the main valve body 2 and the sub-valve body 3 are arranged like a conventional two-shaft rotating device having two operation shafts.
Each time the valve is opened and closed, the complicated operation of rotating the two operation axes in the specified direction in the valve opening or valve closing direction is not required, and the operation can be easily performed. No errors occur.

In the above-described embodiment, the two-shaft rotating device with one operating shaft according to the present invention is applied to the opening / closing device of the butterfly valve with a built-in auxiliary valve. The present invention is not limited to only the opening and closing device for the butterfly valve, but can be applied to a device for rotating two members rotating around an axis in a specified order in a forward direction and a reverse direction.

[0037]

As described above, according to the present invention, the rotation direction of one operation shaft is specified only by specifying the rotation direction of one operation shaft without considering the opening / closing operation sequence of the main shaft and the sub shaft. The two axes can be rotated based on a simple opening / closing operation sequence. Therefore, as in a conventional two-axis rotating device having two operation axes, each time two axes are rotated, the two operation axes are specified in the specified order. This eliminates the need for a complicated operation of rotating in the forward or reverse direction, allows easy operation, and improves the reliability because no error occurs in the operation order.

[Brief description of the drawings]

FIG. 1 is a plan view showing a main valve body and a sub-valve body when an embodiment of the present invention is closed.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a side view of a rotation transmission mechanism.

FIG. 4 is an explanatory diagram showing a closed state of a main valve body and a sub-valve body.

FIG. 5 is a view corresponding to FIG. 1 when a main valve body is closed and a sub-valve body is opened.

FIG. 6 is an explanatory diagram showing a valve closing state of a main valve body and a valve opening state of a sub valve body.

FIG. 7 is a view corresponding to FIG. 1 when the main valve body is opened.

FIG. 8 is an explanatory diagram showing a valve open state of a main valve body.

FIG. 9 is a front view of a conventional example applied to a butterfly valve with a built-in sub-valve.

FIG. 10 is a plan view of FIG. 9;

FIG. 11 is a side view of FIG. 9;

FIG. 12 is an enlarged sectional view taken along line BB of FIG. 10;

FIG. 13 is an enlarged sectional view taken along line CC of FIG. 10;

[Explanation of symbols]

 Reference Signs List 4 Upper valve shaft (main shaft) 14 shaft (sub shaft) 17 2-axis rotating device 31 main shaft worm wheel 32 sub shaft turning arm 33 clutch 34 sub shaft lead screw shaft 34A male screw 35 rotation transmission mechanism 36 female screw top 37 female screw top 38 Pin (one connecting portion) 49 Slit (the other connecting portion) 40 Operating shaft 40A Input side of operating shaft 40B Output side of operating shaft 42 Worm 44 Clutch lever R1 Valve opening direction (first rotation direction) R2 Valve closing direction (2nd rotation direction)

Claims (1)

[Claims] 1. A main shaft and a sub shaft inserted through the main shaft along an axis of the main shaft are specified in forward and reverse directions around an axis of the main shaft by rotation of one operation shaft. A two-axis rotating device for rotating the main shaft in a sequential order, the main shaft-side worm wheel being provided so as to be simultaneously rotatable with the main shaft, and being provided on the sub-shaft so as to be opposed to the main shaft-side worm wheel. A countershaft side swing arm, a clutch rotatably supported having an axis intersecting the axes of the main shaft and the countershaft, and having a clutch for interrupting power from an input side to an output side, and One operation shaft provided with a worm meshing with the main shaft side worm wheel so as to be rotatable at the same time; a sub shaft side lead screw shaft provided rotatably in parallel with the one operation shaft and provided with an external thread on the outer periphery; A rotation transmission mechanism for transmitting rotation on the input side of the operating shaft to the countershaft-side lead screw shaft; and a female screw portion screwed to a male screw on the outer periphery of the countershaft-side lead screw shaft. A female screw piece that moves in the axial direction of the counter shaft side lead screw shaft following the first rotation direction and the second rotation direction on the input side, and one connecting portion provided on the female screw piece; The side pivot arm interferes with the one connecting portion when the female screw top advances following the rotation of the counter shaft side lead screw shaft accompanying the rotation of the input side of the one operation shaft in the first direction. The female screw piece that rotates the countershaft-side turning arm, simultaneously rotates the countershaft, and follows reverse rotation of the countershaft-side lead screw shaft accompanying rotation of the input shaft of the one operation shaft in the second direction. When retreating, it interferes with the one connecting portion and The other linking portion is provided for rotating the shaft-side rotating arm in the reverse direction and simultaneously rotating the sub-shaft in the reverse direction. From the latter half of the advancement of the female screw top to the first half of the backward movement, the clutch interferes with the female screw top and turns the clutch “ON”. In the first half of the forward movement and the second half of the backward movement of the female screw top, interference with the female screw top is released, and a clutch lever for turning off the clutch is provided. Shaft rotation device.