JPS6224196B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a two-member centering attachment/detachment device.

In recent years, welding robots, painting robots, and other industrial robots have become popular, and their automatic mechanical power is used to perform various tasks such as welding various workpieces, painting, soldering, parts assembly, and press processing. It is. Now, to take a typical welding operation as an example, when a specialized welding robot suitable for a certain workpiece is introduced and a small number of products are mass produced, it is installed on the work floor. As a welding jig stand for peripheral equipment that carries workpieces into and out of a fixed robot, it is sufficient to adopt a device with a special structure and function that is suitable only for a small number of types of workpieces. This makes it possible to improve work efficiency, and even if it is quite expensive as a special order item, it is profitable for mass production of the workpiece.

However, small and medium-sized enterprises that are subcontractors of large companies that mass-produce large products must produce a wide variety of assembly parts in small or medium quantities in response to frequent model changes of the large products, and also have to produce complex parts in small or medium quantities. Parts with weld lines often have to be welded so as not to interfere with their appearance, and the quality and precision of the finished product must be extremely high. In response to such demands, it is clearly disadvantageous in terms of work efficiency and profitability to introduce the above-mentioned dedicated welding robot or a jig stand device as its peripheral equipment, and it is important to avoid versatility or flexibility. There are practical reasons for introducing welding robots that are rich in
The operating rate of such general-purpose welding robots is still not high. Even assuming that the robot itself has excellent versatility, the jig table device that works in conjunction with the robot to load and unload workpieces is capable of responding to changes in the variety of workpieces. If there is no flexibility, the result will be the same, and the operating rate of the robot will not be improved.

The versatility or flexibility of the jig table device related to peripheral equipment means that various jig tables for clamping workpieces, depending on the variety of workpieces, can be moved to a slide board for loading and unloading the robot. , meaning that it can be attached and detached with compatibility.
Furthermore, in this case, once the two members are installed, it is necessary to maintain the two members, the table and the slide plate, in a secure and stable fixed state, and to obtain excellent centering position accuracy. Otherwise, the welding action position will be out of order due to the movement of the robot, making it impossible to obtain highly accurate finished quality. Furthermore, the structure of the attachment/detachment device must be simplified to facilitate maintenance and inspection, and anyone can perform the so-called one-touch attachment/detachment operation with high efficiency. This kind of thing involves not only the welding work by the robots mentioned above, but also painting, soldering, etc.
The same can be said about fusing, parts assembly, press working, and other operations.

The present invention aims to provide a two-member centering attachment/detachment device that meets these demands, and its specific configuration will be described in detail below based on the illustrated embodiment. That is, the figure shows a general-purpose robot for arc welding as a representative example of an industrial robot, and illustrates the present invention applied to a welding jig table device as a peripheral device.
In FIGS. 1 to 11, reference numeral 1 denotes a leg stand for installation on a work floor, and the frame is made of metal squares and has a rigid rectangular parallelepiped shape as a whole. Reference numeral 2 denotes a pair of left and right slide guide rails laid on the upper surface of the foot stand 1, and extend parallel to each other along the longitudinal direction (front-back direction) of the foot stand 1. Reference numeral 3 denotes a slide drive unit that is assembled and integrated with the foot stand 1 at a mutually intermediate position between both rails 2, and drives a slide plate for transporting a workpiece, which will be described later, to reciprocate along the rails 2, thereby moving the jig. It functions to carry the work on the table into and out of the working area of the welding robot R. In this regard, the drive unit 3 uses a differential piston type rotary actuator as a drive source, and moves its mounting base 4 along a pair of guide shafts 5 in a straight line via a chain using air pressure. It involves a slide cylinder that makes reciprocating motion. However, as long as the reciprocating sliding action described above can be performed, hydraulic pressure, an electric motor, or other driving means may be used instead of pneumatic pressure. Reference numeral 6 denotes a pair of left and right air cylinders attached to one end in the longitudinal direction of the leg stand 1 (the rear end from which the workpiece is taken out), and a piston rod 7 that projects upward from this has an overhanging stop at its screw end. A cap tube 9 with a par flange 8 is screwed onto it and fixed with a lock nut 10. By turning the nut 10, the mounting height position of the cap tube 9 relative to the screw tip can be adjusted. This air cylinder 6 is used to move the lifting plate (described later) when the welded workpiece is carried out from the welding robot R as shown in Figs. It has a lifting effect (see FIGS. 7 to 9), and therefore, if such an effect can be performed, a hydraulic cylinder or other elevating means can be used in place of the air cylinder 6.

In this regard, in the figure, the angle stay 11 is welded to the side surface of the installation base 1, and the mounting flange 12 of the air cylinder 6 is joined to the stay 11.
Further, although it is fixed by a plurality of bolts 13 and nuts 14, the means for attaching and fixing it is not limited to these. In addition, the pair of cylinders 6 face each other on a diagonal line of a substantially rectangular slide plate in relation to the planar form of the slide plate, lifting plate, jig table, etc. (see Figs. 3 and 6). Although they are fixedly installed on the footrest 1, it goes without saying that the arrangement is not limited to this arrangement.

A slide plate 15 for transporting the workpiece is fixedly installed on the mounting base 4 of the drive unit 3 so as to reciprocate integrally with the base 4, and has a substantially rectangular shape when viewed from above. Reference numeral 16 denotes a plurality of rail receiving seats fixed to the lower surface of the slide board 15, and as is clear from FIGS. 4 and 8, the grooves form the rails so that they can be slid freely onto the rails 2 on the base 1. are combined. 17 is also slide board 1
A stopper flange 18 protrudes near the head of a plurality of elevating guide pins installed on the upper surface of the elevating board 5, and positions and regulates the upper limit of the elevating plate, which will be described later. In the figure, the guide pin 17
is fixed to the slide board 15 by screwing from above, but other means can be used for the mounting and fixing means.

Reference numeral 19 denotes a jig table fixedly attached to the slide board 15 so as to be removable and replaceable, and may also be called a jig pallet. Although the details are not shown, a welding jig suitable for the workpiece is installed in advance, and the workpiece can be detachably set or clamped by this jig. In the present invention, various types of jig tables with welding jigs corresponding to the different shapes of the workpieces are prepared in advance for replacement in order to produce a wide variety of workpieces in small quantities and in medium quantities. The jig table 19 is interchangeably attached to the slide plate 15 by an attachment/detachment device which will be described in detail later, and is used for automatic welding of the workpiece.

The elevating plate 20 includes a slide plate 15 and a jig table 1
An escape port 21 is provided in the center of the table 19, which is approximately rectangular when viewed from the plane, so that the table 19 can move up and down smoothly without interfering with the attachment/detachment device of the table 19. has been done.
(See FIGS. 3 and 6) Reference numeral 22 designates a plurality of eject pins installed on the upper surface of the elevating table 20, and correspond to pin ejecting holes 23 formed through the jig table 19. That is, as the elevator plate 20 rises, the eject pin 22 penetrates the jig table 19 and removes the welded work from the welding jig on the table 19, as is clear from FIGS. 7 to 9. This will push it up a little to make the removal process easier. The eject pin 22 is
The pins 22 are freely inserted and removable into grooves dotted on the top surface of the elevator board 20, and therefore the pins 22 themselves can be replaced or inserted into other grooves freely. can. Extract pin 2 like this
2 and its recessed holes 23, their number and arrangement are appropriately determined in response to various changes in the workpiece. Reference numeral 24 designates holes for receiving a plurality of guide pins, which are also opened through the elevating plate 20, and are fitted in correspondence with the elevating guide pins 17 of the slide plate 15, thereby allowing the elevating plate 20 to move up and down correctly and smoothly. It acts as a guide. Since the elevating plate 20 is always assembled to the slide plate 15 through the fitting state of the guide pin 17 and its receiving hole 24, it is also possible to reciprocate integrally with the slide plate 15. .

Further, reference numeral 25 denotes a pair of left and right positioning stoppers fixed to the lower surface of the elevator board 20, and
As is clear from FIGS. 9 and 10, the piston rod 7 is releasably engaged with the cap tube 9 of the piston rod 7. In other words, when the jig table 19 is unloading the workpiece to the welding robot R, the stopper 25 and the cap tube 9 are used to stop the lifting plate 20 at a predetermined position as shown in FIGS.
The air cylinder 6 is adapted to engage with the air cylinder 6, and is operated in its stopped state.
The elevator platform 20 is pushed up as shown in Figures 7 to 9,
The eject pin 22 pushes up the welded workpiece from the jig on the table 19.

On the other hand, when carrying the workpiece into the welding robot R, as shown in FIGS.
The lock between the stopper 25 and the cap tube 9 is released, and after the workpiece is removed, the lifting plate 20 returns to its lowered position, and the workpiece for next welding is placed on the jig table 19 without any hindrance. Preparation for installation continues, and slide plate 15
It is carried into the welding robot R by the forward movement of the welding robot R.

In the figure, the stopper 25 is formed into a groove-shaped or horseshoe-shaped seat with one end (rear side) open along the sliding direction of the elevator board 20 when viewed from the bottom (see Figure 11). ), and is fixed to the lower surface of the elevator board 20 with a plurality of bolts 26. Reference numeral 27 denotes a receiving stepped portion provided on the inner wall surface of the concave groove with respect to the cap tube 9, and is removably engaged with the stopper flange 8 protruding from the cap tube 9 of the piston rod 7. Therefore, the elevating platform 20 can be lowered positively and quickly by the air cylinder 6, and the work efficiency is excellent. As shown in the figure, the cap tube 9 at the screw end of the piston rod 7 protrudes so as to always block the slide path of the elevator plate 20 with a stopper 25, and is correctly faced with the positioning stopper 25.

Such welding jig table devices are used as a pair of parallel configurations as shown in FIG. The state in which the workpiece is being carried forward into the welding robot R by the slide plate 15 that reciprocates along the rail 2 on the installation base 1 (see Figs. 5 and 6);
The workpieces are each held in the same backward and forward unloading state (see Figures 2 and 3), are safely subjected to automatic welding at the former stop position, and are welded workpieces removed at the latter stop position;
Preparations are made to attach the workpiece for next welding. Then, when removing it, the elevator plate 20 is
The lifting operation as shown in FIG. 9 and the subsequent lowering and return of the lifting plate 20 during welding preparation are both as described above.

In that case, as suggested in Fig. 1, the two welding jig stand devices perform the above-mentioned functions alternately to operate the welding robot R efficiently, but the number of installed Arrangement forms other than those shown can be adopted. For example, a plurality of jig stand devices may be installed in a radial arrangement with the welding robot R at the center.
Since the welding robot R itself is not the object of the present invention, it is only shown schematically in the figure, but it is actually an articulated type with 5 to 6 degrees of freedom, and is fixed on the work floor. The so-called control
PTP method is used. In any case, the above-mentioned operation of the jig table device is of course electrically controlled in conjunction with the automatic welding operation by the welding robot R, so that the operator must control the control panel. All you have to do is press the button.

The above-mentioned attachment/detachment device for the jig table 19 constitutes an assembled unit, and is interposed between the upper and lower sides of the table 19 and the slide plate 15, which face each other, as a pair as shown in FIGS. 1 to 8. ing. That is, the 12th ~
In the enlarged view of Figure 21, 28 is jig table 1
9 is a nail plate removably fixed to the lower surface of 9 by a plurality of bolts 29, and its hanging tip is a circular flange pawl 30 that projects outward, and the flange pawl 30 has a part halfway around its circumference. Further, a plurality of lock release grooves 31 are cut out to open on the outside. In the case of the figure, the grooves 31 are arranged as a pair of two facing each other on a straight line, but the number may be further increased as long as they are arranged at equal intervals on the flange pawl 30. Reference numeral 32 designates a large-diameter cylindrical portion stepped at the center opening of the claw plate 28, into which a centering guide bush 33 made of hardened steel is fitted and fixed.

On the other hand, 34 is a nail plate on the slide plate 15 side that faces the nail plate 28 on the table 19 side, and is fixed to the upper surface of the slide plate 15 via a mounting seat plate 36 fixed to the lower surface with bolts 35. There is.
Numeral 37 is a bolt for removably fixing the seat 36. This claw board 34 has a cylindrical shape, and the upright end has a flange claw 3 on the table 19 side.
A flange pawl 38 corresponding to 0 and a continuous concave circumferential groove 39 are formed directly below the flange pawl 38. In that case, the figure suggests that the flange pawl 38 on the slide board 15 side does not have the above-mentioned lock release groove 31. Reference numeral 40 denotes a large-diameter cylindrical portion which is also stepped at the center opening of the claw plate 34, and serves as a spring storage chamber. Reference numeral 41 designates a centering guide post made of bearing steel that is press-fitted into the center opening of the claw board 34 from below, and the lower end thereof is preferably shielded by the mounting seat board 36. The upper end of the nail plate 3
The ball retainer 42 protrudes from the upper surface of the ball retainer 4 and faces into the pawl board 28 on the table 19 side, and a ball retainer 42 that tightly fits into the centering guide bush 33 in a removable manner is fitted onto the protruding portion. The race portion of the ball retainer 42 is made of synthetic resin, aluminum, copper, brass, etc., and a group of steel balls 43 are embedded and held therein so as to freely slide, and are in point contact with the guide bush 33. 44 is a coil spring that always applies upward force to the retainer 42 from below, and its elasticity and helical direction combine to make the ball retainer 42
This allows for the lifting and lowering and rotation of the table 19 side pawl board 28, thereby facilitating the fitting and disengaging action with the table 19 side pawl board 28, while maintaining a highly accurate state of close contact with the guide bush 33 after the fitting. The spring 44 is enclosed within the spring storage chamber 40. Reference numeral 45 denotes a slip-off prevention plate for the ball retainer 42, which is detachably fixed by a screw 46 screwed into the upper surface of the guide post 41.

Also, 47 is a nail plate 28 on the jig table 19 side,
These hook segments are for engaging and fixing the claw plate 34 on the slide plate 15 side, and are made of hardened steel, and are scattered as a plurality of hook segments with a size and arrangement that match the above-mentioned lock release groove 31. There is. The segment 47 has a horizontal U-shaped cross section and is attached from the outside so as to straddle between the upper and lower flange claws 30 and 38 of both claw plates 28 and 34, and the upper end hook portion 48 By table 1
The flange pawl 30 on the 9 side is restrained to prevent it from coming off, and the lower end hook portion 49 is also secured to the pawl plate 34 on the slide plate 15 side.
It is rotatably fitted into the concave circumferential groove 39 at.

50 is a rotation ring for integrally rotating a plurality of segments 47;
It is fixed from the outside with bolts 51.
Reference numeral 52 denotes a segment receiving groove cut out in the middle of the inner circumferential surface of the rotating ring 50;
Therefore, the segment 47 is restrained and fixed in the lock 2, and the segment 47 can match with the unlocking groove 31 cut out in the pawl plate 28 on the table 19 side. Reference numeral 53 denotes an operating handle protruded from the middle of the rotating ring 50, which is rotated by the operator when attaching or detaching the table 19 to or from the slide plate 15. 54
When the table 19 is removed,
This is a positioning stopper screw for preventing free rotation of the rotating ring 50, and a steel ball 55 held at the tip thereof is pressed by a coil spring 56 sealed inside the screw 54. Such a stopper screw 54 is screwed into the middle of the rotation ring 50, and the ball 55 at its tip constantly presses the flange pawl 38 on the pawl plate 34 on the slide plate 15 side. Frictional resistance is applied to the free rotation of the movable ring 50, thereby preventing the operating position of the operating handle 53 from changing from time to time.

In the above, the operating handle 53 and the stopper screw 54 are installed independently, but as long as the above purpose can be achieved, the 22nd, 2nd
As shown in FIG. 3, the stopper screw 54 may be enclosed within the operating handle 53. Accordingly, by rotating the stopper screw 54 back and forth with the operator's hand holding the handle 53, the ball 55 and the spring can be removed. This can be said to be effective in that it can provide frictional resistance to the rotation ring 50 without requiring the rotation ring 56. The reference numeral 57 added to both figures indicates the above-mentioned mounting seat plate 36.
This is a dowel pin that is driven and fixed at the center of the slide plate 15 so as to protrude from the bottom surface of the slide plate 15.
When the heel plate 34 is attached with a plurality of bolts 37, it is useful to facilitate the alignment work and to improve the parallelism accuracy of the attachment state between the plurality of attachment/detachment devices. The lower surface of the mounting seat 36 and the upper surface of the claw plate 28 are both polished with high precision, so that the slide plate 15 and the jig table 19 can be kept in a correct parallel state with each other. It's summery.

Figures 12 to 15 show the slide panel 1 on the installation base 1.
In this state, the hook segment 47 that is fitted and fixed to the rotating ring 50 is in the unlocking groove 31 of the nail plate 28 on the table 19 side. are in a mutually misaligned relationship that does not match,
Therefore, the upper end hook portion 48 of the segment 47 restrains the table 19 from slipping out upward from the slide plate 15.

Therefore, when removing the table 19 from the slide plate 15 in order to replace it with another one, for example, the rotation ring 50 must be removed so that the hook segment 47 matches the lock release groove 31 of the claw plate 28.
from FIG. 14 by its handle 53.
The rotation operation is performed by a certain rotation angle θ to the state shown in FIG. 6. Then segment 47
The upper end hook portion 48 and the flange claw 30 of the claw plate 28
Since the locking action is released, the table 19 can be pulled up along its centering guide post 41, and can be completely removed from the slide board 15 as shown in FIGS. 19-21. FIG. 17 shows, so to speak, the state in the middle of the process. By aligning the segment 47 with the lock release groove 31 of the nail plate 28 and pushing the nail plate 28 downward along the guide post 41, the table 19 can be moved into the slide plate 15.
Of course, it can be attached and fixed to.

In any case, the nail plate 28 on the table 19 side and the centering guide post 41 on the slide plate 15 side are connected to each other by a centering guide bush 33 fitted and fixed in the center opening of the former, and a centering guide bush 33 fitted externally to the latter. The rotatable ball retainer 42 can be freely fitted and removed through point contact with the balls 43, and the retainer 42
Since a pushing force is also applied by the coil spring 44 to the retainer 42, the lifting and lowering of the retainer 42 and the free rotation of its balls 43 can be facilitated. Therefore, such movement allows the attachment and detachment of the table 19 to be performed in a so-called one-touch type. It can be done easily and efficiently. In addition, despite its excellent operability,
Once the table 19 is installed, the ball retainer 42 of the centering guide post 41 and the centering guide bush 33 maintain a tight fit, ensuring a highly accurate positioning state with no lateral vibration, and a complete positioning of the table 19 by the segments 47. A fixed lock state can be achieved. The fact that the guide bush 33, guide post 41, and ball retainer 42 are assembled components that are of high quality and easy to finish also contributes to achieving this effect.

Mutual opening width dimension S of the upper and lower end hook portions 48 and 49 of the horizontal U-shaped cross-sectional hook segment 47
As suggested from the enlarged view of FIG. 18, by setting the rotation ring 50 in a tapered shape that gradually becomes narrower as the rotation ring 50 is rotated in one direction, the operation handle 53 can be rotated in one direction. It is preferable that the rotation in the opposite direction automatically be used as the locking direction of the table 19, and the rotation in the opposite direction as the unlocking direction of the table 19, and that instructions and guidance for the operation be provided to each operator. be. It goes without saying that the rotation angle θ of the operating handle 53 can be determined to the most appropriate constant value depending on the degree of steepness of the inclination angle in this tapered shape.

In the illustrated embodiment, the present invention is applied to a jig stand device as a peripheral device of a welding robot, but it is not limited to such welding work, but can also be applied to painting, soldering, fusing, parts assembly, pressing, etc. The present invention can also be applied to various operations such as processing. In this sense, the jig table 19 and the slide plate 15 are only representative examples of two members that can be attached and detached in the centering state. As for the attachment/detachment device, it can be used interposed between two members that face each other vertically, so to speak, in a vertical installation position, or fixedly installed in a horizontal installation position or tilted at a certain angle. It goes without saying that you can get it.

As described above, in the two-member centering attachment/detachment device according to the present invention, due to its structure, the claw board 28 should be fixed to one member, and the claw should be fixed to the other member opposite thereto. A centering guide post 41 fixedly erected from the center of the other nail plate 34 so as to be removably fitted into the center opening of one of the nail plates 28 and 34; A rotating ring 50 is attached to both outer circumferential surfaces of the flange claws 30 and 38 correspondingly protruding from each tip, and the inner circumferential surface of the rotating ring 50 can be integrally rotated. , and a plurality of hook segments 4 having a horizontal U-shaped cross section and fixed in a radially symmetrical arrangement.
7, and one end of the hook segment 47 has a hook portion 49.
is freely rotatable into the concave circumferential groove 39 formed in the middle of the outer peripheral surface of the other nail plate 34, and the nail plate 34
The other end of the hook portion 4 of the hook segment 47 is fitted in a restrained state to prevent it from coming off by the flange claw 38 of the hook segment 47.
8 is the flange pawl 3 on one of the pawl plates 28.
0, so that the flange claw 30 is locked so that it cannot come out, and is aligned with a plurality of lock release grooves 31 cut out on the outer peripheral surface of the flange claw 30.
It is determined that the locking action can be released only when the hook segment 47 is rotated by a certain angle θ by the rotation ring 50, and the center opening of the centering guide post 41 and one of the nail plates 28 is provided. The fitting surface with the ball retainer 42 attached to the outer peripheral surface of the guide post 41
The ball 43 is held in point contact with the centering guide bush 33 press-fitted into the inner peripheral surface of the nail plate 28, and the ball is held in point contact by the coil spring 44, which is also attached to the middle of the outer peripheral surface of the guide post 41. Since a pushing force is always applied to the retainer 42 from below, the requirements mentioned at the beginning can be met by applying this force to a jig stand device such as the illustrated embodiment. , it becomes possible to make the jig stand device exhibit versatility or flexibility.

That is, when the two members are attached, the flange pawl 30 protrudes from one pawl plate 28 and the flange pawl 38 correspondingly protrudes from the other pawl plate 34.
are restrained and fixed in the axial direction along the guide post 41 by the hook segment 47, and the deflection in the direction perpendicular to that direction is also prevented from coming off through the ball retainer 42 for centering. Since this is prevented by the close fitting action between the guide post 41 and the guide bush 33, a reliable and stable fixed state and extremely excellent centering accuracy can be achieved. Although such installation accuracy without backlash may seem contradictory, as it may cause difficulty in attachment/detachment operations, in the present invention, the above-mentioned centering guide bush 33 and ball retainer 4 are
The ball retainer 42 is configured to make point contact with the ball 43 of No. 2, and since the ball retainer 42 is always given a pushing force from below by the coil spring 44, the hook segment 47 is simply pressed in advance. By only rotating by a certain angle θ,
You can attach and detach two parts extremely easily and efficiently.

Furthermore, its structure is extremely simple as an assembly unit, and all of its assembly parts are mass-produced products that are of high quality and easy to finish, so it can be provided as a product itself at a low cost.
9 and 37, it can be said to be a practical invention as it can be used for general purpose mounting not only on the jig table 19 and the slide board 15 but also on other two members to be attached and detached.

[Brief explanation of the drawing]

The figure exemplifies the present invention as applied to a welding jig table device for loading and unloading workpieces into and out of a welding robot, and FIG. 2 is a partially cutaway side view of the device, FIG. 3 is a partially cutaway plan view with the jig table removed, and FIG. 4 is a front view of FIG. 4 to 4 also show the state of unloading the workpiece to the robot (returning state of the slide plate). Fifth,
Figure 6 also shows the loading state of the workpiece (the forward movement state of the slide board), Figure 5 is a partially cutaway side view corresponding to Figure 2, and Figure 6 is a partially cutaway side view corresponding to Figure 3. It is a notch top view. 7 and 8 show the raised state of the elevator, FIG. 7 is a partially cutaway side view corresponding to FIG. 2, and FIG. 8 is a front view corresponding to FIG. 4. Figure 9 is a partially enlarged sectional view taken along line 9-9 in Figure 3, and Figure 10 is a 10-10 view in Figure 9.
- A cross-sectional view taken along line 10, Figure 11 is an enlarged bottom view showing the positioning stopper of the elevator platform, and Figure 1
2 to 21 are enlarged views of the attaching/detaching device related to the main parts of the present invention, and FIG.
Figures 3 to 15 are lines 13-13 and 14-1 in Figure 12.
Sectional views along line 4 and line 15-15, No. 16
The figure is a sectional view corresponding to Fig. 14, which also shows the unlocked state, Fig. 17 is a half-cut sectional view taken along line 17-17 in Fig. 16, and Fig. 18 is an enlarged slope showing an extracted hook segment. Fig. 19 is a half-cut sectional view corresponding to Fig. 12 showing the removed state of the table, Fig. 20 is a plan view showing the slide plate side pawl plate after its removal, and Fig. 21 is the same table side pawl plate. A bottom view showing the board, and FIGS. 22 and 23 are half-cutaway sectional views showing two types of modifications corresponding to FIG. 13. 15...Slide board, 19...Jig table,
28, 34... Nail board, 30, 38... Flange claw, 33... Centering guide bush, 41... Centering guide post, 42... Ball retainer,
43...Ball, 44...Coil spring, 47...
Hook segment, 50... Rotating ring, 53... Operation handle.

Claims (1)

[Claims] 1. Nail plate 28 to be used firmly on one member
and a nail plate 34 to be used fixedly to the other member so as to face this, and a nail plate 34 fixedly erected from the center of the other nail plate 34 so as to removably fit into the center opening of the one nail plate 28. centering guide post 41, a rotating ring 50 fitted over both outer circumferential surfaces of the flange claws 30, 38 correspondingly protruding from the tips of both claw plates 28, 34, and the rotating ring. hook segments 4 having a horizontal U-shape in cross section and fixed as a plurality of hook segments arranged radially symmetrically so as to be integrally rotatable toward the inner circumferential surface of the hook segment 50;
7, and one end of the hook segment 47 has a hook portion 49.
is freely rotatable into the concave circumferential groove 39 formed in the middle of the outer peripheral surface of the other nail plate 34, and the nail plate 34
The other end of the hook portion 4 of the hook segment 47 is fitted in a restrained state to prevent it from coming off by the flange claw 38 of the hook segment 47.
8 is the flange pawl 3 on one of the pawl plates 28.
0, so that the flange claw 30 is locked so that it cannot come out, and is aligned with a plurality of lock release grooves 31 cut out on the outer peripheral surface of the flange claw 30.
It is determined that the locking action can be released only when the hook segment 47 is rotated by a certain angle θ by the rotation ring 50, and the center opening of the centering guide post 41 and one of the nail plates 28 is provided. The fitting surface with the ball retainer 42 attached to the outer peripheral surface of the guide post 41
The ball 43 is held in point contact with the centering guide bush 33 press-fitted into the inner peripheral surface of the nail plate 28, and the ball is held in point contact by the coil spring 44, which is also attached to the middle of the outer peripheral surface of the guide post 41. A two-member centering attachment/detachment device characterized in that a pushing elastic force is always applied to the retainer 42 from below. 2. The two-member centering attachment/detachment device as set forth in claim 1, wherein a rotation urging force in one direction is applied to the ball retainer 42 due to the helical directionality of the coil spring 44. 3. The mutual opening width dimension S of the hook portions 48 and 49 at both ends of the hook segment 47 is determined by the rotation ring 5.
The two-member centering attachment/detachment device according to claim 1, characterized in that the two-member centering attachment/detachment device is set in a tapered shape that gradually becomes narrower as it is rotated in one direction.