JPH0741506B2 - Phase automatic adjustment mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a work phase automatic adjustment mechanism, and more specifically, a work is held between a first gripping means and a second gripping means, and is rotationally driven. The present invention relates to a phase automatic adjustment mechanism configured to rotate either one of the first gripping means or the second gripping means under the driving action of a source to perform phase matching and perform a machining process on a work.

BACKGROUND OF THE INVENTION In an internal combustion engine, a camshaft is used as a component of a valve opening / closing mechanism for opening / closing valves such as intake valves and exhaust valves via rocker arms. In fact, since the cam shaft slides on the rocker arm, the cam sliding surface is required to have particularly high wear resistance. In this case, since a special alloy is required to manufacture a camshaft having a high wear resistance as a whole with only a metal material, there is a disadvantage that the camshaft itself becomes extremely expensive.

Therefore, various surface hardening treatment apparatuses have been adopted for forming a thin film having a hardness higher than that of a metal material formed of a cam shaft, that is, having excellent wear resistance on the cam sliding surface. For example, a so-called remelting / hardening apparatus that forms a hardened layer on the cam sliding surface by remelting the cam sliding surface using an arm made of plasma gas or the like and then performing cooling treatment is a preferable example. I will be raised.

This type of remelting / hardening apparatus generally includes a gripping member that grips and rotates both ends of a camshaft, and a plasma torch that is displaceable in the longitudinal direction of the camshaft and in the vertical direction. including. Therefore, in order to perform the surface hardening treatment on the camshaft using the remelting and hardening treatment apparatus, first, the camshaft is manually held in the horizontal direction, and then both ends of the camshaft are held by the holding members. While maintaining the state where the plasma torch and the surface of the cam shaft are separated by a predetermined distance, the plasma torch is reciprocally displaced by facing the cam sliding surface of the cam shaft and re-melting the cam shaft sliding surface. It is carried out.

However, in view of the current needs of companies for mass production, the work of holding a relatively heavy camshaft by hand and then positioning it on the gripping device does not significantly improve productivity. Also, a considerable number of workers are required.

Therefore, the applicant has devised a mechanism for transporting the camshaft as a work to the remelting and hardening treatment apparatus by using a manipulator, but still manpower is required to position the work at a desired position with respect to the gripping device. It has been pointed out that the inconvenience of not getting a profit.

The present invention has been made to overcome the above inconvenience, and when performing the surface hardening treatment of a work using a plasma torch, the phase matching of the work held by the first holding means and the second holding means is performed. It is an object of the present invention to provide an automatic phase adjusting mechanism for a work which enables the above to be suitably faced with a plasma spraying mechanism or the like.

[Means for Achieving the Object] In order to achieve the above object, the present invention provides first and second gripping means which are arranged to face each other and grip a work by abutting against the end of the work. A rotary drive source for rotating at least one of the first and second gripping means, and a displacing means for displacing the first and second gripping means so as to abut the respective end portions of the work. The first gripping means includes a first center positioning pin that is fitted in a first recess defined in the center of one end of the work, and a first center positioning pin defined near the first recess of the work. A first protrusion that is fitted into the first phase-adjusting recess, and the second gripping unit is defined as a second recess that is formed substantially at the center of the other end of the workpiece under the displacement action of the displacement unit. Second center positioning pin fitted in the And a second protrusion fitted into a second phase matching recess defined in the vicinity of the second recess of the work, and the second protrusion is elastically moved to the second phase matching recess. An elastic member that biases the second center positioning pin, the distal end portion of the second center positioning pin is provided so as to project toward the workpiece side from the distal end portion of the second protrusion, and the first end portion of the workpiece on the one end portion side is provided. The first center positioning pin is fitted into the concave portion, while the second center positioning pin is fitted into the second concave portion on the other end side of the work, and the second phase matching concave portion is provided under the urging action of the elastic member. The second projection is fitted, the rotary drive source is rotated, and the first projection is fitted in the first phase matching recess to perform phase matching.

[Operation] In the automatic phase adjustment mechanism according to the present invention, first, the first gripping means and the second gripping means are relatively displaced to the work side under the biasing action of the displacement means. As a result, the first center positioning pin that constitutes the first gripping means and the second center positioning pin that constitutes the second gripping means have the first concave portion and the second concave portion that are defined substantially at the center of the end portion of the work. The work is retained by being fitted in the recess. In this case, since the tip of the second center positioning pin is provided so as to project to the work side from the tip of the second protrusion, the second protrusion is It is not fitted in the second phase matching recess defined near the second recess.

Then, the rotary drive source is rotated, and the second
The protrusion is pressed toward the workpiece to fit into the second phase matching recess, and the first protrusion fits into the first phase matching recess to automatically adjust the phase with respect to the work.

[Embodiment] Next, a preferred embodiment of the automatic phase adjusting mechanism according to the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1, reference numeral 10 indicates a work processing apparatus incorporating the phase automatic adjustment mechanism according to the present embodiment. The work processing apparatus 10 includes a support mechanism 12, a work transfer mechanism 14, and a phase automatic adjustment mechanism 16. Basically composed. The support mechanism 12 is a support table 18a, 1 which is arranged on the floor at a predetermined interval.
Columns 20a and 20b, which include 8b and extend in the vertical direction, are provided above the supporters 18a and 18b, respectively. This pillar 20
A guide bar 22 is bridged to the a and 20b so that their upper ends are substantially parallel to the floor surface. Although the guide bar 22 has a substantially prismatic shape, the guide bar 22 projects on one side of the guide bar 22.
22a is provided, and the rotary drive source 24 is provided on one end side of the upper surface thereof. A pulley 24a is attached to the drive shaft of the rotary drive source 24. On the other hand, a pulley 24b is arranged on the other end side of the guide bar 22, and the pulley 24a
A belt 26 is suspended between and.

Next, the work transfer mechanism 14 will be described. In fact, the work transfer mechanism 14 includes a housing 32, and a work mounting table 34 is movably arranged on the upper surface of the housing 32 so as to mount a camshaft as a work. As easily understood from FIG. 2, the work mounting table 34 engages with the first cylinder 36 provided on the housing 32, and moves forward and backward under the urging action of the first cylinder 36. the 36a, in FIG. 2, is freely displaced in the arrow a ₁ -A ₂ direction. That is, the cylinder rod 36a is engaged with the projecting portion of the work mounting table 34, and the plurality of works mounted on the recess defined by the mounting table 34 can be sequentially positioned at predetermined positions. The work transfer mechanism 14 further includes a moving table 38 that moves under the displacement of the belt 26. The movable base 38 has a vertically-arranged holding plate 40, and the holding plate 40 is provided with a second cylinder 42.

A plate 44 that bends is attached to the cylinder rod 42a of the second cylinder 42, and the third cylinder 46 is attached to the plate 44.
Is stuck. A grip portion 48 is arranged at the tip of the third cylinder 46. The grip 48 is the third cylinder
Includes claw members 49, 49 that open and close under the urging action of 46.
A pair of guide rollers 47a and 47b pivotally supported on the back of the holding plate 40 is provided. This pair of guide rollers 47a, 47b
Rolls on the guide rail 22a to transfer the holding plate 40 to a desired position.

On the other hand, the automatic phase adjusting mechanism 16 according to the present invention is arranged near the work transfer mechanism 14. The automatic phase adjustment mechanism 16 includes a fixed base 52, and a pair of support columns 54a and 54b are vertically installed on the fixed base 52, and the first work holding mechanism 56a is provided on each of the support columns 54a and 54b.
(First gripping means) and second work gripping mechanism 56b (second gripping means) are arranged. Therefore, the first work holding mechanism 56a will be described first.

Substantially, the first work gripping mechanism 56a includes a first base 58a mounted on the fixed base 52 and a cylinder 60 supported by the base 58a. The cylinder 60 has a first port 62a,
A second port 62b is defined and has a piston 6 therein.
4 is slidably arranged. A rod 66 is connected to one end of the piston 64, and a tail end portion of the rod 66 is exposed to the outside of the cylinder 60 and a piston position detecting member 68.
To face. The piston position detection member 68 is equipped with a proximity switch 68a which the tog of the rod 66 faces. Piston 6
A plate 72 is attached to the end of the piston rod 70 that is integral with the 4
Is fixed to the plate 72, and the proximity switch 76 is attached to the plate 72 via a plate 74 that is bent. A center positioning pin 80 (first center positioning pin) is rotatably supported on the plate 72 via a bearing 78. The center positioning pin 80 has a tip portion 80a formed with an acute-angled taper, and bearings 84, 88 engaged with a cylindrical body 82.
The rotation is secured by. These cylinders 82
Are surrounded by a larger diameter cylinder 90, which is prevented from relative rotation by a key 92. An elastic body, preferably a coil spring 94, is provided inside the cylindrical body 90.
A plate that is internally installed and closes the opening of the cylindrical body 90.
96 is pressed in the direction of arrow B. Plate 96 contains a pair of auxiliary locating pins for easy understanding.
98a and 98b (first protrusion) are planted. In the figure,
Reference numeral 99 indicates a dog that can face the proximity switch 76.

Next, the second work holding mechanism 56b will be described. The second work holding mechanism 56b includes a second base 58b mounted on the fixed base 52 and a cylinder 100 supported in a hollow shape by the second base 58b, like the first work holding mechanism 56a. .
The cylinder 100 has a first port 102a and a second port 102b.
And a hollow piston 104 is slidably disposed therein. A first bush 106a and a second bush 106b are fitted in the hollow portion of the piston 104, and a main shaft 108 is rotatably held by the bushes 106a and 106b. A center positioning pin 110 is provided on one end of the spindle 108.
The (second center positioning pin) is fixed, and the tip of the center positioning pin 110 is formed with a sharp taper like the center positioning pin 80. The center positioning pin 110 is substantially fixed to a casing 114 by a bolt 112, and phase matching drivers 116a and 116b (second protrusions) are formed on the end surface of the casing 114 so as to project therefrom. A cylindrical body 120 is fitted onto a main shaft 108 extending outward from the bush 106b via a key 118, the cylindrical body 120 is rotatably supported by bearings 122 and 124, and the bearings 122 and 124 are cylindrical. It is held by the casing 126. Further, a pulley 128 is fitted to the end of the center positioning pin 110, and the holding plate 13
A timing belt 138 is suspended between a pulley 136 mounted on a rotary shaft 134 of a rotary drive source 132 supported by 0.

A rod-shaped piston position detecting means 140 is fixed to the center positioning pin 110, a piston forward end dog 142 and a piston backward end dog 144 are fixed to the piston position detecting means 140, and the dogs 142 and 144 are provided with a first member. Through the third proximity switches 146, 148 and 50. In the figure, reference numeral 152 indicates a coil spring (elastic member) that elastically presses the drivers 116a and 116b in a predetermined direction.

Next, pillars 153a and 153b are vertically provided on the upper surface of the fixed base 52, and the rotary drive source 15 is provided near the upper ends of the pillars 153a and 153b.
The ball screw 156 that rotates by 4 is bridged. A holding body 158 meshes with the ball screw 156 and is displaceable in the directions of arrows C ₁ -C ₂ . The arrow C ₁ is attached to the tip of the holder 158.
The plasma spraying mechanism 160 is mounted so as to be orthogonal to the −C ₂ direction.

The plasma spraying mechanism 160 will be schematically described below with reference to FIGS. 5 and 6.

This plasma spraying mechanism 160 has a hollow shield cap 1
62, a first nozzle tip 166 having a conical tip portion 164 at the lower end, and a first passage 1 for shield gas between the first nozzle tip 166 and the shield cap 162.
A second nozzle tip 172 that defines 68 and a second passage 170.
And high-hardness metal powder introduction tubes 174a, 17 that are integrally held by the second nozzle tip 172 and the shield cap 162.
Including 4b and.

That is, the main body 176 that constitutes the mechanism 160 has a substantially cylindrical shape, and the inner peripheral surface of the main body 176 has a screw hole 178 formed therein. Then, the electrode 180 is arranged in the main body portion 176, and the screw portion 182 formed at one end portion of the first nozzle tip 166 is screwed into the screw hole 178. The first nozzle tip 166
A hole 184 for inserting the electrode 180 is formed in the center of the hole 184, and a plasma gas outlet nozzle 186 having a smaller diameter than that of the hole 184 is formed to communicate with the outlet of the hole 184 via a step. Further, the outer peripheral portion of the first nozzle tip 166 and the main body portion 176
An opening 188 is defined between the inner periphery of the opening 1 and the opening 1
Cooling water is supplied to 88.

On the other hand, on the outer peripheral portion of the main body portion 176, the shield gas ejection member 1
92 is fixed, and a passage 194 communicating with a shield gas supply source (not shown) is formed inside the ejection member 192. A step portion 196 is formed on the outer peripheral portion of the ejection member 192,
An insulator 198 is disposed in contact with the step 196, and
One end of the nut member 200 engages with this insulator 198. In this case, the insulator 198 is preferably formed of a heat resistant resin material such as ceramic or Teflon. Therefore, the second nozzle tip 172 and the shield cap 162 are integrally supported by the main body 176 via the nut member 200.

A threaded portion 202 that is screwed into the nut member 200 is formed at one end of the outer periphery of the second nozzle tip 172, and the central portion of the second nozzle tip 172 is relatively large from the end side where the threaded portion 202 is provided. An opening 204 having a large diameter is formed, and an insulator 206 is interposed in the opening 204. Therefore, the second nozzle tip 172 and the ejection member 192 are electrically insulated via the insulators 198 and 206, respectively. In addition, the insulator 206 and the ejection member 1
A chamber 208 is defined by 92, the main body portion 176, and the first nozzle tip 166, and the chamber 208 communicates with a shield gas supply source (not shown) via the ejection member 192.

The first nozzle tip 166 is provided on the inner periphery of the second nozzle tip 172.
A cover member 209 formed corresponding to the outer peripheral surface shape of the is fixed, and the cover member 209 and the second nozzle tip 172 are attached.
And a cooling water opening 210 is defined therebetween. An insulator 212 is fitted and fixed to an inner peripheral portion of the cover member 209, and a thin first passage 168 is defined between the insulator 212 and the first nozzle tip 166. The upper end of the first passage 168 is a chamber
The other end on the lower side of the first passage 168 communicates with 208, and is coaxial with the nozzle portion 186 of the first nozzle tip 166 and the nozzle portion 186.
It communicates with a nozzle portion 214 having a diameter slightly larger than 186. In addition, a plurality of passages 216 are formed in the second nozzle tip 172, one end of which communicates with the chamber 208 and the other end of which communicates with the second passage 170, and the second nozzle tip 172 horizontally extends from the outer peripheral portion of the second nozzle tip 172. On the other hand, the hole portions 218a and 218b are formed so as to be inclined at a predetermined angle.

On the other hand, the shield cap 162 is fixed to the outer peripheral end of the second nozzle tip 172, and the second passage 170 defined between the shield cap 162 and the second nozzle tip 172 is the passage 21.
6. It communicates with the passage 194 of the ejection member 192 through the chamber 208. Then, the second nozzle chip 1 is attached to the shield cap 162.
Holes 220a and 220b coaxial with the holes 218a and 218b of 72 are bored, and the introduction pipes 174a and 174b are integrally fitted to the holes 218a, 220b and 218b, 220b.

In FIG. 1, reference numeral 250 denotes a lift table provided on the fixed base 52 and vertically displaceable by a cylinder (not shown). The lift table 250 includes a set of standing claw members 252a, With 252b. A work can be horizontally mounted via the claw members 252a and 252b as described later.

The work machining apparatus incorporating the automatic phase adjustment mechanism according to the present invention is basically constructed as described above. Next, its operation and effect will be described.

As shown in FIGS. 1 and 2, a plurality of works, for example, cam shafts are placed in parallel on the placing table 34. Therefore, the second cylinder 42 is driven to drive the cylinder rod.
42a is lowered, and then the third cylinder 46 is urged to maintain the claw members 49, 49 of the grip portion 48 in the open state. Next, when the first cylinder 36 is driven, the cylinder rod 36a moves to the mounting table 34.
Is displaced in the direction of the arrow A ₂ so that the first work W is located at the intermediate portion between the claw members 49, 49. Then, the cylinder 46 is driven to close these claw members 49, 49 to hold the work W.

Next, the mounting table 34 is returned to the original position by the urging action of the cylinder 36, while the first cylinder 36 is raised and positioned at a predetermined position. Next, when the rotary drive source 24 is rotationally driven, the belt 26 suspended by the pulleys 24a and 24b is displaced in the direction of arrow C ₂ , and as a result, the holding plate 40 that constitutes the work transfer mechanism 14 is moved by the arrow C ₁ It will be displaced in the direction. At this time, the guide roller pair 47a, 47b rolls on the guide rail 22a provided on the guide bar 22, and smoothly reaches the phase automatic adjustment mechanism 16 according to the present invention. Then, the second cylinder 42 is urged, and the cylinder rod 42a moves downward. At this time, the elevating table 250 moves up under the action of a driving source (not shown), and thus the work W reaches the claw members 252a, 252b. Therefore, the third cylinder 46 is urged to push the claw members 49, 49.
Is largely opened, and the work W gripped by it is positioned on the claw members 252a, 252b.

The preparatory stage is completed through the above steps, and then the automatic phase adjustment mechanism 16 is energized. That is, the work W is provided on its end face with the tip portion 80a of the center positioning pin 80 in advance.
And a recess into which the positioning pins 98a and 98b are fitted is formed. On the other hand, the other end of the work W is formed with a recess in which the other center positioning pin 110 and the drivers 116a and 116b are fitted. Therefore, first, compressed air is introduced from the port 62a to displace the piston 64, whereby the center positioning pin 80 is fitted into the recess formed on the one end side of the work W. This is detected by the proximity switch 68a. At this time, the positioning pins 98a and 98b are the work W
Has not yet been fitted into the corresponding recess.

At the same time, compressed air is similarly introduced into the cylinder 100 from the port 102b, and the piston 104 is displaced in the direction of arrow C ₁ . As a result, the tip 1 of the center positioning pin 110
10a is fitted in a recess formed on the other end side of the work W. At this time, the drivers 116a and 116b have not yet been fitted into the pair of grooves defined in the other end of the work W. That is, the work W is the center positioning pin 80
And 110. This positional displacement is detected by the dogs 142 and 144 and the proximity switches 146 to 150.

Therefore, the rotary drive source 132 is driven. This rotary drive source 1
The rotational force of 32 rotates the drive shaft 134 and the pulley 136 causes the belt 13 to rotate.
The main shaft 108 is rotated by rotating 8 through the pulley 128. Therefore, the casing 114 rotates as the center positioning pin 110 rotates, and as a result, the casing 114 rotates.
Driver 116a, 116b integrated with the coil spring 152
Under the elastic action of, the work W is fitted into the groove existing on the other end side. Therefore, the entire work W is rotated in accordance with the rotating operation of the casing 114, and the positioning pin is provided in the pair of recesses formed on the one end side of the work W under the elastic action of the coil spring 94. 98a and 98b are connected. As a result, the work W reaches a predetermined position and its phase matching is automatically achieved.
In other words, on the side of the first work gripping mechanism 56a, the plate 96 is constantly positioned by the coil spring 94 so that the positioning pins 98a and 98b are kept.
Is being pressed. Therefore, the pair of holes on one end side of the work W is rotated to a predetermined position, and the positioning pin is generated by the elastic force of the coil spring 94.
98a and 98b are fitted into the holes of the work W.

After the phase of the work W is automatically adjusted in this way, the plasma spraying mechanism 160 is energized.

Therefore, after the plasma spraying mechanism 160 is positioned in the vicinity of the portion of the work W that will be the sliding contact portion, the electrode 180 is connected to the negative side of a DC power source (not shown), while the work W is connected to the positive side. Further, a working gas such as argon gas is supplied to the hole 184, and a shield gas is supplied to the ejection member 192 from a shield gas supply source (not shown). Therefore, the electrode 18
An arc is generated between 0 and the work W, and this plasma gas is squeezed by the nozzle portion 186 of the first nozzle tip 166 to form a high-speed plasma arc from the tip portion 164 to the second portion.
It is led out to the outside through the nozzle portion 214 of the nozzle tip 172.

In this case, as shown in FIG. 6, after the shield gas supplied to the ejection member 192 is introduced into the chamber 208 from the passage 194,
A part of the plasma gas enters the relatively thin first passage 168, and the other shield gas passes through the second passage 170 through the plurality of passages 216 and is discharged from the nozzle portions 186 and 214 of the plasma arc. Be sprayed on. Therefore, the plasma arc can be further reduced in diameter under the action of the converging effect due to the gas flow and the thermal pinch effect due to the cooling due to the shield gas supplied from the circumferential direction, and the high temperature can be obtained at a desired portion of the work W. , Jet a high-speed plasma arc to melt it effectively. As a result, the molten pool 222 can be formed in the work W.

On the other hand, powdery high-hardness metal 224 is supplied into the plasma arc from the respective introduction pipes 174a and 174b. that time,
The high hardness metal 224 may be supplied alone or in combination of two or more.

The high-hardness metal 224 supplied into the plasma arc from the respective introduction pipes 174a and 174b is heated by the plasma arc and mixed into the molten pool 222 at high speed. Here, the ejection pressure of the plasma arc acts on the high-hardness metal 224, and the movement of the mechanism 160 is controlled so as to be displaced in the predetermined direction above the work W, so that the high-hardness metal 224 is agitated and melted. Disperse evenly in 222. At this time, if the high-hardness metal 224 is easily melted, this molten pool 222
If it is difficult to melt, it is dispersed in the molten pool 222.

In this way, the mechanism 160 is displaced to form the molten pool 222 at a predetermined portion of the work W, and then the power supply to the electrode 180 and the work W is stopped. Next, when the work W is cooled for a predetermined time, a hardened layer in which the high hardness metal 224 is uniformly dispersed or mixed is formed on a desired surface layer portion of the work W.

[Advantages of the Invention] As described above, according to the present invention, a worker conventionally holds a long work such as a cam shaft and performs phase matching while visually recognizing the work process of a plasma spraying mechanism or the like. On the other hand, according to the present invention, it is possible to automatically perform the phase alignment of the work without requiring human labor. As a result, the production efficiency is improved in the processing without allocating a large number of personnel, and the processing step capable of sufficiently responding to the mass production currently required for automation is performed. Furthermore, since the device itself has an extremely simple structure and the phase can be easily adjusted through a single drive source, there is no concern that the production cost will be increased so much. Moreover, since it is not necessary to arrange a large number of workers at a work site where a high-temperature arc is generated such as plasma spraying, various effects such as further improvement in safety can be obtained.

Although the present invention has been described with reference to the preferred embodiment, the present invention is not limited to this embodiment,
It goes without saying that various improvements and design changes can be made without departing from the scope of the present invention.

[Brief description of drawings]

FIG. 1 is a schematic front view of a processing apparatus incorporating an automatic phase adjustment mechanism according to the present invention, FIG. 2 is a schematic side view of the processing apparatus shown in FIG. 1, and FIG. 3 is an automatic phase adjustment according to the present invention. First to configure the mechanism
FIG. 4 is a partial vertical explanatory view of the work gripping mechanism, FIG. 4 is a vertical schematic explanatory view showing a second work gripping mechanism of the phase automatic adjustment mechanism according to the present invention, and FIG. 5 is an exploded perspective view of essential parts of the plasma spraying mechanism. FIG. 6 is a vertical cross-sectional explanatory view of an assembled state of the plasma spraying mechanism shown in FIG. 10 …… Work processing device 14 …… Work phase mechanism 16 …… Automatic phase adjustment mechanism 24 …… Rotation drive source 34 …… Work placement table 38 …… Movement table 52 …… Fixed table 80,110 …… Center positioning pin 98a , 98b …… Positioning pins 116a, 116b …… Driver 160 …… Plasma spraying mechanism

Claims (3)

[Claims] 1. A first and a second gripping means, which are arranged so as to face each other and grip a work by contacting an end portion of the work, and at least one of the first and second gripping means is rotated. And a displacement means for displacing the first and second gripping means so as to contact the end portions of the work, respectively, wherein the first gripping means is substantially the same as the one end portion of the work. A first center positioning pin fitted in a first recess defined in the center; and a first projection fitted in a first phase matching recess defined near the first recess of the work. The second gripping means is provided with a second center positioning pin fitted in a second recess defined in the center of the other end of the work under the displacement action of the displacement means, and the rotation action of the rotary drive source. Below the first recess defined near the second recess of the work. The second center positioning pin includes: a second protrusion that is fitted into the two-phase alignment recess; and an elastic member that elastically biases the second protrusion toward the second phase alignment recess. Is provided so as to project from the tip of the second protrusion toward the work side, and the first center positioning pin is fitted in the first recess on the one end side of the work, while the other end of the work is provided. The second center positioning pin is fitted in the second concave portion on the side, and the second projection is fitted in the second phase matching concave portion under the urging action of the elastic member, and the rotary drive source is rotated to rotate the rotary drive source. 1. An automatic phase adjustment mechanism characterized in that the first projection is fitted in the phase matching recess to perform phase matching. 2. The mechanism according to claim 1, wherein the first protrusion of the first gripping means comprises a driven side auxiliary positioning pin,
The automatic phase adjusting mechanism, wherein the second protrusion of the second gripping means comprises a driver provided on the rotary drive source side. 3. The automatic phase adjusting mechanism according to claim 1 or 2, wherein the displacement means comprises a cylinder.