JPH0613805Y2 - Positioning stopper - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention locks a positioning member that is biased from one stand to the other stand of two relatively horizontally moving stands. The present invention relates to a positioning stopper that improves the operability of positioning in the positioning stopper.

[Prior art]

As a technique for positioning a movable table such as a rotary table or a parallel movement table at a predetermined position on the base, a knocking pin that is elastically urged from the movable table to the base is provided on the movable table, and a positioning stopper to which the knock pin can be fitted is inserted. The indexing mechanism that is arranged on the base is widely used.

However, since the conventional positioning stopper has a structure in which a fitting hole is simply bored in the block, in order to lock the knock pin with the positioning stopper, the movable base is positively positioned at a position where the knock pin and the fitting hole are concentric. It is necessary to manually stop or decelerate. If you neglect this operation,
This is because when the knock pin passes over the positioning stopper, the knock pin cannot be smoothly fitted into the positioning stopper only by its urging force, and there is a possibility that the knock pin may pass over it.

[Problems to be solved by the invention]

As described above, in the conventional positioning stopper that merely forms the insertion hole in the block, it is necessary to positively stop or decelerate the movable table at the position where the positioning member and the insertion hole are concentric. However, in the conventional device that requires such an operation, the work efficiency is poor, and it is difficult to ensure the perfectness of the positioning operation.

The present invention solves such a problem, and eliminates the operation of actively decelerating or stopping a pair of relatively horizontally moving bases at the position where they should be positioned.
It is intended to provide a positioning stopper capable of performing positioning.

[Means for solving problems]

As a means for solving the above problems, the present invention provides a positioning stopper between two pedestals, which are arranged to face each other with a predetermined gap, and which move relatively horizontally.
A positioning member elastically propelled in a direction of vertically advancing to the other table is provided on one table so as to be movable back and forth, and the other table is horizontally moved integrally with the one table. A guide member is provided for slidingly contacting the projection end portion of the positioning member to displace the positioning member backward against the resilience of the positioning member, and the positioning member is slidably contacted with the guide member and integrally moved with one of the tables. A pair of locking members are provided at the front of the horizontal movement path of the member at a distance that allows the projecting end portion of the positioning member to enter, and the pair of locking members are located at the front and rear positions of the horizontal movement path and of the guide member. The pair of locking members is an elastic member having an elastic force smaller than the elastic force of the positioning member and is arranged on the other base so that the state of protruding from the sliding contact surface is prevented. Is vertically urged toward the The locking member on the front side of the road retracts by receiving the elastic force of the positioning member that is slidably contacted with the guide member and moved backward, and when the positioning member moves horizontally to the space between the pair of locking members. The locking member that has been pressed up to that point rebounds elastically, and the pair of locking members arranged before and after the moving path locks the positioning member from both sides thereof to position the two machine bases. It adopts a configuration for performing.

[Action]

When the positioning member slides on the guide member while the two horizontally moving bases move relative to each other, the positioning member is displaced against the urging force thereof, and the locking member is elastically pressed and displaced. At the same time, the positioning member engages between the pair of locking members. At this time, the locking member elastically returns, and the locking member locks the positioning member from the front and the rear in the relative movement direction of the table, positions one table with respect to the other table, and stops the table. .

〔Example〕

Hereinafter, the present invention will be described based on an embodiment applied to a pallet changer. The pallet changer shown in FIGS. 3 and 4 is a clamping device 1A fixed on a work table 1 of a numerically controlled machine tool such as a machining center.
And a pallet stocker 2 such as a carrier, which is rotatably supported by a pallet table 4 on a base 3.
The pallet is exchanged between the clamp device 1A and the pallet stocker 2 by rotating the pallet. The positioning stopper (82, 102, 1 shown in FIG. 4) according to the present invention is used.
03, 104) are used as an indexing mechanism for positioning the pallet mounting table 4 pivotally supported by the base 3.

Although detailed illustration of the clamp device 1A is omitted, the pallet 11 carried in from the pallet changer can be temporarily positioned and the temporarily positioned pallet 11 can be positioned and fixed at a machining position by a machine tool. After the completion of processing, the fixed state of the pallet 11 is released and the pallet 11 can be carried out to the pallet changer.

(1) Outline of pallet changer First, the pallet changer as a whole will be schematically described with reference to FIGS. 3 and 4, in which a pallet changer is mounted on a base 7 fixed to the floor via anchor bolts 6 and an installation device 9 is interposed. The lift base 8 is fixed, the base 3 is fixedly arranged on the upper surface of the lift 8, and the pallet mounting base 4 is pivotally supported on the base 3 so as to be horizontally rotatable. The lifting table 8 adjusts and sets the heights of the pallet mounting table 4 and the clamp device 1A fixed on the work table 1 to be substantially equal when the pallet changer is installed. Further, the installation device 9 is used when the pallet changer is installed. The lifter 8 is fixed to the base 7 by finely adjusting the front-rear, left-right, and horizontal positions of the changer, and the height position set by the lifter 8.

Both ends in the longitudinal direction of the pallet mounting table 4 are pallets 11
The first loading / unloading port 12 and the second loading / unloading port 13 are provided, and between the first loading / unloading port 12 and the center of rotation, an appropriate number of pallets 11 loaded / unloaded through the first loading / unloading port 12 are guided and supported. Two pairs of first rails 16 including guide rollers 15 are laid, and similarly, a pallet 11 that is loaded and unloaded through the second loading / unloading port 13 is guided between the second loading / unloading port 13 and the center of rotation. An appropriate number of guide rollers 1 to support
Two pairs of second rails 18 comprising 7 are laid. On the other hand, at one end of the base 3 facing the clamp device 1A,
A guide roller 20 that supports and guides the pallet 11 that is transferred between the clamp device 1A and the pallet mounting table 4.
And a fixed pair of bridges 21 having At the other end of the base 3 facing the pallet stocker 2, a pair of bridges 23 having guide rollers 22 for supporting and guiding the pallet 11 transferred between the pallet stocker 2 and the pallet placing table 4 are provided. It is provided so that it can be selectively positioned in a substantially horizontal or vertical state.

When the first loading / unloading port 12 and the second loading / unloading port 13 of the pallet mounting table 4 are opposed to the clamp device 1A and the pallet stocker 2, respectively, a pallet (not shown) on which an unprocessed work is attached is palletized via the second loading / unloading port 13. Stocker 2
Is loaded onto the second rail 18 of the pallet mounting table 4 to wait for the transfer to the clamp device 1A, and after the processing is finished, the processed workpiece is attached via the first loading / unloading port 12 of the pallet mounting table 4. The loaded pallet 11 is loaded from the clamping device 1A of the machine tool to the first rail 16, and then the pallet mounting table 4 is rotated 180 °, while the pallet 11 to which the processed workpiece is attached is mounted. To the pallet stocker 2, and on the other hand,
A pallet (not shown) to which an unprocessed work is attached is carried out to the clamp device 1A fixed to the work table 1 of the machine tool.

As shown in FIG. 4, at the left and right positions of the pallet mounting table 4, a pair of positioning pins 78 and 98 are elastically urged to project from the bottom surface side, and the positioning pins 78 and 79 are fitted into the base 3. Positioning stoppers 82, 102, 103, 10
4 are arranged at 90 ° intervals, and the pallet mounting table 4 is positioned while the pallet mounting table 4 is being rotated. The positioning pin moves up and down in conjunction with the rotation of the hook levers 120 and 121, and the pallet 1 is loaded from outside the machine.
When the tip portion of 1 abuts on the corresponding hook lever, the positioning pin rises and separates from the stopper. With this mechanism, the pallet mounting table 4 is swung to rotate the work table 1
When the pallet 11 is exchanged between the clamp device 1A and the pallet stocker 2 fixed on the top, the pallet mounting table 4 is positioned with respect to the pallet stocker 2 and the clamp device 1A and released.

(2) Positioning Pin in Indexing Mechanism FIG. 5 shows a structure for urging the positioning pin 78. At the center of the base 3, a base block 62 composed of a stud ring 62A and a disc 62B having a bearing 61 fitted and fixed to the outer periphery is fixed, and
Further, a substantially annular center block 63 is fixed concentrically with the bearing 61. The pallet mounting table 4 is rotatably fitted in the center block 63, and the pallet mounting table 4 is inserted.
Bearing holder 64 mounted on the lower surface of the mounting table 4
It is rotatably supported by the bearing 61 via.

A pair of center plates 66 are fixedly arranged on the pallet mounting table 4 symmetrically with respect to the turning center and parallel to the pair of first rails 16. Partition plates 68 and 69 are fixed between both center plates 66 near the carry-in / out port 12. As shown in FIG. 5, a pipe 70 is provided at the center of one partition plate 68 near the center block 63.
Is slidably fitted in the longitudinal direction of the first rail 16, and the other partition plate 69 is fitted with a slidable rod 72 concentric with the pipe 70.
Then, the push rod 73 having a screw at the intermediate portion is screw-fitted to couple the both. Lock nuts 74 and 75, which prevent the loosening of the push rod 73 with respect to the rod 72 and the pipe 70 by adjusting the amount of screwing the push rod 73 with respect to the rod 72 and the pipe 70, are screwed into the intermediate portion of the push rod 73, and the push rod 73 is pushed from the left end surface of the pipe 70. Make the tip protrude. On the axial extension of the push rod 73, a positioning pin 78 is slidably fitted into a bush 77 fixed through the front and back of the pallet mounting table 4, and the head of the pin 78 and the right end of the rod 72 are fixed. , L-shaped ring 80 pivotally supported on the center plate 66. The push rod 73 is inserted into the rod 72 by inserting the compression coil spring 81 by bringing both end portions into contact with the partition plate 69 and the lock nut 75.
Is elastically urged toward the center block 63, so that the positioning pin 78 is always urged in the descending direction.

The second loading / unloading port 13 with respect to the turning center of the pallet mounting table 4.
The side is also constructed similarly to FIG.

(3) Configuration of Positioning Stopper The positioning stoppers 82, 102, 103, and 10 described above.
4 has basically the same structure, and as shown in FIG. 1 showing a longitudinal section thereof, when the pallet mounting table 4 is swung, the locating pins 78 (98) are projected to the lower end portion of the positioning pin 78 (98). A stopper holder as a guide member having upwardly inclined surfaces 110A and 110B capable of slidingly moving the pin 78 (98) upward against the urging force of the compression coil spring 81 on both sides of the passage of the positioning pin 78 (98). 1
11 is fixed to the base 3, and a pair of slide stoppers as locking members are elastically urged upward by compression coil springs 112A and 112B having a smaller elastic force than the compression coil spring 81 in a central opening thereof. 113A and 1
Slide guides 13B at a predetermined interval from each other.
The slide stoppers 113 </ b> A and 1 </ b> A that are supported and inserted so as to be vertically movable by 12 and that are elastically urged upward
The stop plate 114, which abuts the upper end of 13B, is fixed on the stopper holder 111 on the side that is out of the passage of the positioning pin 78 (98). Curved surfaces 115A and 115B having substantially the same curvature as the positioning pins 78 (98) are formed in the central portions of the facing surfaces of the slide stoppers 113A and 113B so that the positioning pins 78 (98) can be fitted therein.
Make up 6.

In the indexing mechanism, when the positioning pin 78 (98) is lowered by the urging force of the compression coil spring 81, when the positioning pin 78 (98) slides on the upward slope 110A while the pallet mounting table 4 is turning. The pin 78 (98) is gradually displaced upward against the urging force of the compression coil spring 81 as the pallet placing table 4 pivots. Positioning pin 78 (9
When the lower end surface of 8) reaches above the slide stopper 113A, as shown in FIG. 2, the positioning pin 78 (98)
The slide stopper 113A descends while elastically displacing downward. When the pallet mounting table 4 is further swung to bring the outer periphery of the positioning pin 78 (98) into contact with the other slide stopper 113B, the positioning pin 7 is correspondingly moved.
When the lower end surface of 8 (98) is separated from the upper end surface of the slide stopper 113A, the stopper 113A is elastically raised and returned, whereby the pair of slide stoppers 113A and 113B are moved to the positioning pins 78 (9).
8) is fitted and restrained in the positioning hole 116 formed by the curved surfaces 115A and 115B. Therefore, it is not necessary to positively stop or decelerate the rotational movement of the pallet mounting table 4 at a position where the positioning pin 78 (98) can be concentric with the positioning hole 116. The pallet mounting table 4 can be positioned on the base 3 automatically by inserting and restraining the positioning pins 78 (98) only by rotating the pallet mounting table 4 until the 78 (98) contacts the slide stopper 113B. . Particularly in the case of this embodiment, the positioning stopper 82,
Since 102, 103, and 104 have a bilaterally symmetrical structure along the turning direction of the pallet mounting table 4, they also act similarly when the pallet mounting table 4 is rotated in the opposite direction to the above.

(4) Structure for disengaging the positioning pin As shown in FIG. 5, hooks that can swing to face the push rod 73 are respectively provided at the centers of the center plates 66 and 67 located inside the center block 63. The levers 120 are concentrically supported, and a friction member such as a disc spring (not shown) is interposed between the opposed end surfaces of the hook lever 120 and the center plate 66, so that each hook lever 120 can receive a predetermined external force. It is constructed so that it can retain its pivot position unless it is actuated. The hook lever 120 has a cushion 122 that can come into contact with the end surface of the pallet 11.
And the ball 123 facing the push rod 73 is fixed, and the groove 11A formed in the lower end of the pallet 11 is fixed.
The hook 124 which can be locked is erected. Hook lever 1
The lower end of the 20 is slidable along the circumferential surface of the center block 63, and the positioning stopper 8 is provided on the circumferential surface of the center block 63.
Reverse trapezoidal recesses 126 are formed at intervals of 90 ° toward 2, 103, 102, and 104, respectively. Therefore, when the pair of positioning pins 78 and 98 sandwiches the center block 63 and is fitted and restrained by the pair of positioning stoppers 82 and 102 (103 and 104), the hook 124 is positioned.
The lower end of the hook fits into the recess 126 and the hook lever 120
When is rotated downward, the hook 124 is detached from the groove 11A of the pallet 11 so that the pallet 11 can be loaded and unloaded. For other parts of the circumferential surface of the center block 63, the hooks 124 are attached to the grooves 11 of the pallet 11.
A guide plane 127 that keeps a fixed height so that it can be locked and retained by A
It is said that.

Center block 63 facing the push rod 73
The outer peripheral surface of is a circumferential surface 128 that can be slidably contacted with the protruding end of the push rod 73, and the circumferential surface 128 is at 90 ° intervals toward the positioning stoppers 82, 103, 102, 104. Through holes 129 are radially formed, and idle pins 130 are fitted in the through holes 129 so as to be retractable, and both end surfaces of the idle pins 130 can be brought into contact with the push rod 73 and the balls 123. On the outer peripheral surface of the center block 63 located above each idle pin 130, there is provided a stop lever 131 which can be rotated to a substantially horizontal state by the elastic urging force of the torsion coil spring 125 and contact the end surface of the pipe 70. Pivot.

Since the lower end surface of the stop lever 131 is positioned above the axis of the pipe 70 when the stop lever 131 is in a substantially horizontal state, the stop lever is attached to the outer peripheral surface of the pipe 70 while rotating the pallet mounting table 4. When 131 is brought into contact, the lever 131 is pushed up by the outer peripheral surface of the pipe 70 and placed on the pipe 70, and the state shown in FIG. 5, for example, can be adopted.

According to FIG. 5, the first loading / unloading port 12 of the pallet mounting table 4
Is facing the clamp device 1A, the stop lever 1
31 is placed on the outer circumference of the pipe 70 and does not restrain the displacement of the push rod 73 integrated with the pipe 70. Therefore,
Locating pin 78 connected to it via a link 80
The downward movement of the compression coil spring 81 is not suppressed, whereby the positioning pin 78 is fitted into the positioning stopper 82, and the pallet mounting table 4 is positioned on the base 3. In this state, the push rod 73 is elastically urged by the compression coil spring 81.
Is the idle pin 130 and the ball 12 facing it.
The hook lever 120 is forcibly rotated via 3 in the direction of forcibly lowering, so that the hook 124 is forcibly removed from the groove 11A of the pallet 11, and the pallet 11 can be carried out from the pallet mounting table 4. If the unprocessed work is attached to the pallet 11, the pallet 1
1 is carried out to the clamp device 1A fixed on the work table 1 of the machine tool, and is carried in again after the processing is completed.

When the pallet 11 having the processed work is carried into the pallet mounting table 4 through the first carry-in / out port 12, as shown in FIG. When the cushion 122 is pressed and brought into contact with the cushion 122, the hook lever 120 is rotated in the counterclockwise direction by the force, and the ball 123 and the idle pin 130 are rotated.
Push rod 73 through compression coil spring 8
1 is displaced in the right direction in the figure against the elastic urging force, the positioning pin 78 is displaced upwardly and disengaged from the positioning stopper 82, and the stop lever 131 is pushed from the outer peripheral portion of the pipe 70. It falls on the outer periphery of 73. Therefore, as shown in FIG. 7, the pallet 1
1 is carried in and the hook lever 12 by the pallet 11
Even if the pressing action of 0 is released, the stop lever 131
Locks the tip of the pipe 70 to maintain the disengaged state of the positioning pin 78 from the positioning stopper 82. At this time, the hook lever 120, which is rotationally displaced in the half-hour hand direction, maintains its rotational position by the frictional braking action of a disc spring (not shown).
24 is fitted and maintained in the groove 11A of the pallet 11.

When the positioning pin 98 on the opposite side is similarly detached and maintained from the positioning stopper 102, the pallet mounting table 4 is
A turning movement is allowed around the center block 63. When the pallet mounting table 4 is swung from the state shown in FIG. 7, the pipe 70 slides laterally on the end surface of the stop lever 131 accordingly, and the positioning pin 78 (98) is positioned directly above the positioning stopper 82 (102). The stop lever 131 separates from the end surface of the pipe 70 at a position away from the position. Then, the push rod 73 is displaced by the elastic urging force of the compression coil spring 81 until the tip of the push rod 73 contacts the circumferential surface 128 of the center block 63, and the positioning pin 78 (98) is displaced downward by following it. . Therefore, when the pallet mounting table 4 is rotated at least 90 ° from the positioning state shown in FIG. 5, the positioning state shown in FIG. 5 is automatically achieved again only by the turning operation.

In this way, the positioning stoppers 82 and 102 (103
And 104) with the positioning pins 78 and 98 locked, the positioning pins 78 and 98 are individually moved based on the transport force of the pallet 11 loaded into the pallet loading table 4 from the pallet loading / unloading ports 12 and 13. When the pallet mounting table 4 is positioned relative to the base 3, the pallet mounting table 4 is automatically lifted off from the positioning stopper and the lifted state of the positioning pins 78 and 98 is automatically released by the pivotal movement of the pallet mounting table 4 allowed thereby. The releasing operation and the releasing operation can be performed mechanically and sequentially by a series of operations from the turning operation of the mounting table 4 to the loading operation of the pallet 11 to the pallet mounting table 4.

(5) Pallet exchange operation example Next, an example of the pallet exchange operation by the pallet changer will be described as a whole.

FIG. 4 shows a state in which the clamp device 1A and the pallet stocker 2 fixed on the work table 1 are arranged opposite to the bridges 21 and 23, respectively, as shown in FIG. At this time, the positioning stoppers 103 and 104
Are substantially unnecessary, their positioning holes 11
6 is fitted with a blind plug 117, and the positioning stopper 1
03 and 104 are essentially non-functional. The bridge 23 is set horizontally. Both positioning stoppers 103 and 104 may be removed from the base 3.

For example, as shown in FIG.
While facing the loading / unloading port 12 to the clamp device 1A,
With the second loading / unloading port 13 facing the pallet stocker 2, one positioning pin 78 is fitted into the positioning stopper 82 and the other positioning pin 98 is fitted into the positioning stopper 102.
The pallet mounting table 4 is positioned on the base 3. At this time, the pallet mounting table 4 supports the pallet 11 a on which the unprocessed work is mounted on the pair of first rails 16. In this state, first, attach the pallet 11a to the clamp device 1A.
Delivered to and entrusted to machine tool processing. Next, from the pallet stocker 2 to the pallet stocker 2 1
It is carried into the pair of second rails 18 and waits for transfer to the clamp device 1A. At this time, the tip of the pallet 11b carried into the pallet mounting table 4 comes into contact with the cushion 122 and pivotally displaces the hook lever 121 by that force. Therefore, as shown in FIG. It is lifted off from 102, and its state is maintained by the stop lever 131. At this time,
Since the positioning pin 78 is still fitted in the positioning stopper 82, rotation of the pallet mounting table 4 is not allowed. Next, when the pallet 11a on which the processed work is placed is carried into the pair of first rails 16 after the processing is completed, the tip of the carried pallet 11a is cushioned by the cushion 12.
Since the hook lever 120 is brought into contact with 2 to be rotationally displaced by the force, the positioning pin 78 is lifted and separated from the positioning stopper 82, and this state is maintained by the stop lever 131, as shown in FIG. In this way, the pallet 1 on which the unprocessed work for the next processing is placed
1b and the pallet 11a on which the processed work is placed are not loaded into the pallet mounting table 4 until the pallet mounting table 4
Turning operation is allowed.

Then, when the pallet mounting table 4 is rotated, when the mounting table 4 is rotated 180 °, the positioning pin 78 (98) is automatically fitted into the stopper 102 (82) and positioned. In this state, the pallet 11b on which the unprocessed work is placed is carried out to the clamp device 1A,
Pallet 11a on which the previously processed workpiece is placed
Is carried out to the pallet stocker 2, the pallet for the next processing is exchanged, and the same operation is repeated if necessary.

Although the present invention has been described in detail based on the embodiments, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the scope of the invention.

For example, in the above-described embodiment, the case where the positioning stopper is applied to the pallet changer has been described, but the present invention is not limited to this, and a two-machine platform that horizontally moves so as to relatively swivel or translate. It can be widely applied to a mechanical configuration for positioning one of the tables on the other table. Further, the positioning stopper is not limited to being provided on the base such as the base, but the positioning stopper may be provided on the movable base such as the pallet mounting table and the positioning member may be provided on the base, contrary to the above embodiment.

Regarding the configuration of the positioning stopper itself, the positioning stopper is configured so as to be a target along the moving direction of the movable table as in the above embodiment, and the positioning member can be locked in both moving directions of the movable table. There is no limitation, and for example, the turning direction of the pallet mounting table with respect to the base can be set by a one-way clutch or the like.
In the case of regulating in the direction, one of the pair of locking members such as the slide stopper of the above-described embodiment is elastically displaceable with respect to the one locking member located ahead of the pallet mounting table in the turning direction. It may be fixed without being biased.

Further, in the above-described embodiment, the case where the movable table such as the pallet table is manually operated has been described, but it goes without saying that the invention can be applied to the case where the operation is performed by a driving force such as a motor.

[Effect of device]

According to the positioning stopper of the present invention, when the positioning member slides on the guide member while the pair of bases move relative to each other,
Following this, the positioning member is displaced against the biasing force thereof, and this positioning member elastically presses and displaces the locking member, and at the same time the positioning member engages between the pair of locking members. , The displaced locking member returns by elastic force, and the two machines can be locked from the front and rear in the relative movement direction. The table can be easily positioned on the other table. Therefore, when moving the pair of bases relatively,
There is no need for special operations such as actively stopping the relative movement or reducing the moving speed at the position where the positioning member and the positioning stopper overlap as in the past, thereby improving the positioning efficiency and perfect positioning. You can have sex.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of a positioning stopper according to the present invention, FIG. 2 is an explanatory view of the operation of locking a positioning pin by the positioning stopper, and FIG. 3 is a pallet to which the positioning stopper is applied. FIG. 4 is a schematic plan view of the pallet changer, FIG. 5 is a partial vertical sectional view of an indexing mechanism in the pallet changer, and FIGS. 6 and 7 are partial views of the indexing mechanism. FIG. 1 ... Work table of machine tool, 2 ... Pallet stocker, 3 ... Base, 4 ... Pallet mounting table, 11 ... Pallet,
79 and 98 ... Positioning pins, 81 ... Compression coil springs, 82, 102, 103, and 104 ... Positioning stoppers, 110A and 110B ... Upward slopes, 111 ...
Stopper holders, 113A and 113B ... Slide stoppers, 115A and 115B ... Compression coil springs.

Claims (1)

[Scope of utility model registration request] 1. A positioning stopper between two pedestals, which are opposed to each other with a predetermined gap and move relatively horizontally, wherein one pedestal is perpendicular to the other pedestal. A positioning member elastically propelled in the advancing direction is provided so as to be able to move forward and backward, and a projection end portion of the positioning member, which is horizontally moved integrally with the one base, is slidably brought into contact with the other base. Is provided with a guide member for displacing backward of the positioning member against its resilience, and in front of the horizontal movement path of the positioning member which is slidably contacted with the guide member and integrally moved with one of the bases,
A state in which the pair of locking members is positioned at the front and rear positions of the horizontal movement path and is projected from the sliding contact surface of the guide member is spaced apart from each other with a space allowing the projecting end portion of the positioning member to enter. The pair of locking members are vertically urged toward the one table separately by elastic members having an elastic force smaller than the elastic force of the positioning member, The locking member on the front side of the movement path is retracted by receiving the elastic force of the positioning member that is slidably contacted with the guide member and moved backward, and the positioning member horizontally moves to the gap space between the pair of locking members. When it comes, the locking members that have been pressed all the way back elastically return, and a pair of locking members arranged before and after the movement path locks the positioning member from both sides of the locking member, and the two machines stand. Positioning stopper characterized by performing positioning of .