JP4200468B1 - Flat door opening and closing mechanism - Google Patents

Abstract

【Task】
A flat door that can be opened and closed smoothly without touching the adjacent door or the end face of the machine frame by applying a manual operation force in one direction with a very simple configuration, and / or the closing process At the end of this period, a low-priced and simple flat door is provided that allows the door to be pulled into a flush position without applying gravity or special manual operating force.
[Solution]
A guide roller which is formed by a straight track, an inner track continuous therewith, an outer track and a straight short track, or / and which is guided by the inner track in the initial stage of the door opening process. By operating the elastic body, the repulsive force is accumulated, and at the end of the door opening process, the repulsive force is released.
[Selection] Figure 3

Description

  The present invention slides to the left or right, and when the door is opened, one door that is opened overlaps with the other door or the front of the machine frame, and when the door is closed, the one door is connected to the other door or the machine frame. The present invention relates to a flat door opening / closing mechanism that is flush with the front surface.

  When the flat door is closed, the end surface of one door is in contact with the other door or the end surface of the machine frame, so that the flat door is tightly closed. Therefore, in order to open it, first, the end surface of one door to be opened must be smoothly separated from the other door or the end surface of the machine frame. For example, Japanese Patent Application Laid-Open No. 2002-89125 discloses an example of a conventional technique that has been devised. In this invention, from the end face where the door is rotated by applying a manual operation force to the side end of the door to be opened in a direction perpendicular to the door, and the other side end of the door is in contact. After the separation, manual operation force was applied in the direction parallel to the door, and the door was overlapped with the other door. That is, to open the door, it was necessary to apply forces in two different directions.

  In addition, in the case of a conventional flat door, when one door is closed and flush with the other door or the front of the machine frame, at the end of the closing process, one door is steadily brought to a flush position. A special force was needed to pull in (close). This is because, unless a pulling force is separately applied, it is difficult to always reliably pull back to the correct position where the door is flush. The invention of Japanese Patent No. 3861249 is one that has been devised for that purpose.

In the present invention, with the help of gravity constantly acting downward on the door, the door is raised to a slightly higher position at the end of the closing process and then dropped into the retracted position. However, in order to perform such an operation, a complicated mechanism and a sturdy structure are required, and as a result, the manufacturing cost is also expensive.
JP 2002-89125 A Japanese Patent No. 3861249

  The problem to be solved by the present invention is a problem that cannot be solved by the above-described conventional technique, that is, by applying a manual operation force in one direction with an extremely simple configuration, it is brought into contact with an end face of an adjacent door or machine frame. Flat doors that can open and close smoothly, and / or where the doors can be pulled to the same level without applying gravity or special manual operating force at the end of the closing process It is to provide an inexpensive and simple flat door.

In order to facilitate understanding, the reference numerals used in the embodiments are appended to each component.
In order to enable the door to be opened and closed without applying contact to the adjacent door or the end face of the machine frame by applying a manual operation force in one direction with an extremely simple configuration, the present invention has the following configuration. It was adopted.
One door 1 that slides to the left or right and opens when the door is opened overlaps the other door 2 or the front of the machine frame, and when the door is closed, the one door 1 is connected to the other door 2 or the machine frame. In a flat door opening / closing mechanism that is flush with the front surface, a support plate 9 extending in a right angle direction is attached to the upper edge of the one door 1, and the tip edge of the support plate 9 is located at an equal distance from the door 1. The guide track 10 is provided in the plane parallel to the support plate 9 to guide the guide portion, and the guide track 10 is parallel to the doors 1 and 2 when the door is closed. A straight track 17, an inner track 11 that curves toward the center and merges with the linear track 17, and an outer track 29 that extends obliquely toward the center and merges with the straight track 17, Parallel to the straight track 17 at the end of the outer track 29 The straight short track 18 extending in the direction is connected, the end of the inner track 11 and the straight short track 18 are arranged at positions where the two guide portions can be engaged when the door is closed, and the outer The length of the track 29 in the left-right direction is longer than the length of the inner track 11 in the left-right direction.

In order to enable the two doors to move stably and alternately without using a highly rigid material for the support mechanism, the guide mechanism, etc. with an extremely simple structure, the following structure is adopted in the present invention.
An outer track in which the distance between the two guide portions is longer than half of the width of one door 1 or 2, one straight track 17 is connected to the inner track 11 and the straight short track 18 at both ends thereof. 29 is provided.

At the end of the closing process, the repulsive force accumulated in the initial stage of the opening process can be used without failing to rely on gravity or special manual operation force, so that the door 1 can always be pulled into a position that is flush with the other. For this purpose, the present invention employs the following configuration.
A disk-shaped index plate provided with a guide roller groove on the periphery of the index base, into which the guide roller of the guide portion closer to the center is fitted, is rotatably attached, and the guide roller extends from the end of the inner track. The peripheral edge of the index plate is placed on the inner track so that the index plate rotates together as it moves to the merging point of the linear track, and the index plate is initially rotated when the door is opened. An elastic body is linked to the index plate so that the repulsive force is accumulated and the accumulated repulsive force is released by the final rotation of the index plate when the door is closed.

In order to enable the guide roller for guiding the movement of the door 1 to move stably and reliably along the track, the present invention employs the following configuration.
A guide portion is formed by a guide roller 14 and a link 12 that are pivotally attached to the support plate 9, and a guide piece 20 that moves along the track with the guide roller 14 is attached to the end of the link 12. A guide piece groove 21 into which the guide piece 20 is fitted is provided along the guide roller groove 19 on the periphery.

As a good example for ensuring that the repulsive force is accumulated in the elastic body at the initial stage of the opening process of the door 1 and the repulsive force accumulated at the end of the closing process is reliably released, the present invention adopts the following configuration. did.
An index plate and a pivot shaft are mounted on the index shaft established on the index base, an index arm is fixed to the pivot shaft, an index finger is inserted in the gap between the index plate and the index arm, and the index finger is attached to the index finger. The protruding piece that engages the index arm and the finger-like long and short fingers are provided, and the tip of the protruding piece is guided and locked at the end by the index cover mounted on the index base. Protruding piece guide grooves are provided, and an operating projection is provided on the index plate. The operating projection enters between the long finger and the short finger as the index plate rotates, causing the index finger and index arm to rotate. Accumulate repulsive force in elastic Allowed, locked at its end when the protruding piece of the index finger reaches the end of the projecting part guide groove, wherein the actuating projection is configured to be detached from the index finger escape from the tip beyond the short fingers

In order to gradually release the repulsive force at the end of the closing process, the present invention adopts the following configuration.
A damper 28 was connected to the rotating shaft.

In the invention described in claim 1, the length of the outer track in the left-right direction is longer than the length of the inner track in the left-right direction. That is, in the attached FIG. 20, the length s1 of the outer track 29 in the left-right direction is longer than the length s2 of the inner track 11. In the initial stage of the door opening process, when each guide roller 14 located at the position of the white circle in the drawing moves to the left by the distance s2, each guide roller 14 moves downward by h2 and h1 in the drawing.
At the beginning of the movement, the guide roller 14 far from the center is on the straight short track 18 and does not move downward. During this time, only the guide roller 14 closer to the center moves downward. Only the left end surface is spaced downward from the right end surface of the door 2. When the guide roller 14 moves from the straight short track 18 to the outer track 29, the downward moving distance is shorter than the downward moving distance of the guide roller 14 closer to the center, so the door 1 gradually changes its angle to the door 2. Approaching to overlap. Thereafter, both the left guide roller 14 and the right guide roller 14 are guided to the linear track 17, and the door 1 moves to a position where it overlaps the door 2 deeply.

The above operation is achieved by a simple configuration in which the lengths of the inner track and the outer track in the left-right direction are different. There is no need to use complicated mechanisms or highly rigid materials. Moreover, it is only necessary to apply a manual operating force in one direction to the door.
The present invention can also be applied to a flat door in which one door is flush with the front surface of the other door, and a flat door in which one door is flush with the front surface of the machine frame.

  In the invention described in claim 2, since the guide roller for guiding the movement of the door has a length exceeding half of the lateral width of the door, the movement is performed much more smoothly than in the case of the half or less of the lateral width. become. In the conventional example, when the door is opened or closed, there are many cases where the lower end of the door fluctuates. However, in the present invention, the fluctuation can be effectively suppressed. Also, since the straight part of the guide track (straight track) is one and the outer track connecting the inner track and the short straight track is provided at both ends, the straight track is used alternately at both doors. be able to. That is, when the right door is overlapped with the left door, the outer track connecting the right inner track and the straight short track is used, and when the left door is overlapped with the right door, the left door is overlapped. Since it is only necessary to use an outer track in which the inner track and the straight short track are connected, the apparatus becomes compact, the number of parts can be reduced, and the manufacturing cost can be reduced.

In the invention described in claim 3, an elastic body is linked to the index plate, and the repulsive force accompanying the rotation of the index plate in the initial stage of the door opening process is accumulated, and the accumulated repulsive force is It is configured to be released at the end of the closing process. Therefore, the door is flushed only by a one-way manual operation force that slides the door to the left or right without requiring a special manual operation force in the pulling-in or pushing-in direction at the end. It can always be reliably pulled into the position.
Unlike the conventional example, since the gravity applied to the door is not used, an operation force for lifting the door to a height is not required.

  In the invention described in claim 4, the guide roller and the guide piece are arranged side by side and attached to the support plate, and both are moved side by side along the track, so that compared to the case where there is only one guide roller. Therefore, the movement of the support plate, and thus the movement of the door, is very stable and reliable.

In the invention described in claim 5, an index plate, an index plate provided with operating projections and linked with an elastic body, a pivot shaft to which an index arm is fixed, an index piece composed of a protruding piece and finger-like long and short fingers, etc. Since the index cover provided with fingers and protruding piece guide grooves has a specific structure and is skillfully combined, the operating projection enters between the long finger and the short finger as the index plate rotates. The finger and the index arm are rotated to accumulate the repulsive force in the elastic body. When the protruding piece of the index finger reaches the end of the protruding piece guide groove, it is locked at the end, and the operating protrusion is a short finger. Smooth the movement of pressing and pushing from the tip to continue turning Constant and can be reliably performed.
In the final stage of the door closing process, these operations are performed in the reverse direction by the above-described configuration.

  In the invention described in claim 5, since the rotating shaft 32 is connected to the damper, at the end of the door closing process, the door slowly approaches a position where it is flush with the door, and is reliably pulled in and stopped.

  Slide left or right and one door that opens when the door is opened overlaps the front of the other door or machine frame, and when the door is closed, the one door is flush with the front of the other door or machine frame. In the open / close mechanism of the flat door, the index plate and the pivot shaft are mounted on the index shaft established on the index base, the index arm is fixed to the pivot shaft, and the index plate is indexed in the gap between the index plate and the index arm. A finger is inserted, the index finger is provided with a protruding piece that engages with the index arm, and a finger-like long finger and a short finger, and the tip of the protruding piece is guided by an index cover that is attached to the index base. Protruding piece guide groove shaped to be locked at the end is provided, and it is made on the index plate. As the index plate rotates, the operating protrusion enters between the long finger and the short finger, rotates the index finger and the index arm, and accumulates a repulsive force in the elastic body. When the projecting piece reaches the end of the projecting piece guide groove, the projecting piece is locked at the end, so that the operating projection can be pulled out from the tip beyond the short finger and detached from the index finger.

Embodiments of the present invention will be described with reference to the accompanying drawings.
1 to 3 are perspective views showing the relationship between the door 1 and the door 2 and the present invention, FIG. 1 is a view when both doors are in a closed state, FIG. 2 is a view when the door 1 starts to open, FIG. 3 is a view when the guide portion of the door 1 enters the linear track 17 and the door 1 is in parallel with the door 2.
FIG. 4 is a plan view of the guide track 10.
5 to 7 are schematic views showing the relationship between the doors 1 and 2, the indexes R and L, and the guide track 10, FIG. 5 is a view when both doors are closed, and FIG. FIG. 7 is a diagram when the guide portion enters the linear track 17 and the door 1 is in a state of being parallel to the door 2 and fully opened.

  8 to 12 are plan views sequentially showing the operation in the initial stage of the door opening process starting from the rotation of the index plate 2, and FIG. 8 shows that the operating projection 26 enters between the long finger 22 and the short finger 23. FIG. 9 is a view when the index arm 3 starts to rotate through the protruding piece 24, FIG. 9 is a view when the rotation further proceeds and the protruding piece 24 reaches the end of the protruding piece guide groove 25, and FIG. FIG. 11 shows a state in which the index finger 5 is slightly inclined and the protruding piece 24 is locked to the end of the protruding piece guide groove 25. FIG. 11 shows that the operating protrusion 26 continues to rotate away from the index finger 5 and the guide roller 14 is guided. FIG. 12 is a view when the index finger 5 and the index arm 3 are stopped after being separated from the roller groove 19, and FIG. 12 shows the guide piece 20 of the guide portion far from the center. Starvation is a view of it passes through the grooves 33.

FIGS. 13 and 14 are diagrams showing the configuration of the part involved in the accumulation and release of the repulsive force, both of which show (a) the configuration on the index cover side and (b) the index base side on which the index cover is mounted. FIG. 13 is a right perspective view, and FIG. 14 is a left perspective view.
15 and 16 show the guide portion, FIG. 15 is a front view thereof, and FIG. 16 is a side view thereof. FIG. 17 is a perspective view of the damper 28.

18 is an exploded view showing an arrangement positional relationship among the index arm 3, the index finger 5, and the index plate 2 to which the rotation shaft 32 is fixed. FIG. 19 is a view in which the spring 4 and the index base 1 are further added to FIG. It is an exploded view.
FIG. 20 is a schematic diagram showing a configuration in which a door can be opened and closed without applying contact to an adjacent door or an end face of a machine frame only by applying a manual operation force in one direction.
In addition, although the above drawings are described about the case where the door 1 and the door 2 move in the vertical plane, the present invention moves the door 1 and the door 2 in the horizontal plane or the like if a slight design change is made. It can also be applied to cases (although specific examples are omitted).

An embodiment of the invention described in claim 1 will be described.
Two guide portions located at the same distance from the door 1 at the front edge of the support plate 9 are attached to the lower side of the support plate 9 (see FIG. 3). It is possible to change the design so that it is attached to the side. In that case, the guide track 10 for guiding the guide portion also changes its position in response to the change.
In designing the guide track 10 provided in the machine frame, in particular, h2 should be a sufficient distance (to separate the left end face of the door 1 from the right end face of the door 2) while h1 shown in FIG. 20 is zero. In consideration of such dimensions, the length of the straight short track 18 and other lengths are determined, and the inward track 11 is curved so as to match the peripheral edge of the index plate. It goes without saying that the confluence of each track is formed so as to be connected smoothly.

An embodiment of the invention described in claim 2 will be described.
The longer the distance between the two guide portions, the more stable the movement of the door. However, since there is only one linear track 17, the door 1 is fully opened as shown in FIG. At times, it can be said that the general design is such that the index L of the door 2 is positioned between the two guide portions of the door 1.
In the figure, the shape of the track is shown with a concave cross section. However, the shape of the track is not limited to this, and the shape of the track may be a cross section like a railroad track, and the guide roller 14 or the like may have a corresponding shape. is there.

Furthermore, the following two measures can be considered as effective measures for stabilizing the parallel movement of the door.
First, factors that make the parallel movement of the door unstable will be described.
When a right angle force is applied to the right edge of the door 1 when the guide roller 14 of the guide portion far from the center passes through the junction of the inner track 11 and the linear track 17 when the door is opened, the door 1 The translation relative to the linear trajectory 17 becomes unstable. In other words, the angle formed by the two lines of the line connecting the guide roller 14 and the guide piece 20 and the center line of the linear track 17 is not zero, and the parallel movement cannot be performed. As can be easily seen from FIG. 20 and the like, the width of the groove of the linear track 17 (in this figure, the length in the direction perpendicular to the center line of the groove of the linear track 17) suddenly increases at the junction. It turned out that it was in the place where the guide roller 14 entered into the widened place.

As a countermeasure not to cause the above phenomenon, it was considered that the groove depth of the straight track 17 is made slightly deeper than the groove depth of the inner track 11 (see FIG. 11). And the guide roller 14 and the guide piece 20 of the guide part far from the center were made into the length corresponding to the depth.
If it does so, the guide roller 14 will be introduced only to the linear track | orbit 17 and will move, without entering into the place where the confluence | merging point became wide. This measure is also effective when the guide portion is composed of only the guide roller 14.
Further, as a measure for reducing the instability, it has been considered to increase the distance between the guide roller 14 and the guide piece 20. Then, even if the preceding guide roller 14 enters the widened area, the angle formed by the two lines of the line connecting the guide roller 14 and the guide piece 20 and the center line of the linear track 17 (see above) It can be made smaller than when the separation interval is short. As the angle decreases (ie, when the angle is close to zero), the instability of movement is reduced.

An embodiment of the invention described in claim 3 will be described.
As shown in FIGS. 8 to 12, 18 and 19, the guide roller groove 19 provided on the peripheral edge of the disk-shaped index plate 2 is easy to fit the guide roller 14 of the guide portion closer to the center. Make it easy to pull out.
As the elastic body linked to the index plate 2, the tension spring 4 is shown in the figure. However, the design may be changed slightly, and it may be a compression spring, or a weight connected to a pulley or a wire can be used, or the built-in gas can be compressed. However, a gas spring that generates a repulsive force may be used.
The spring 4 shown in FIGS. 8 to 14 is stretched between the index base 1 and the mooring piece 30 provided on the rotating shaft 32 as clearly shown in FIGS. 19, 13, and 14. When the door 1 is opened, the repulsive force is designed to be accumulated with the rotation of the index arm 3 fixed to the rotation shaft 32.
When an object other than a spring is used as an elastic body, a design change suitable for it must be made.

An embodiment of the invention described in claim 4 will be described.
Details of the guide portion are shown in FIGS. 15 and 16. In the figure, a guide portion is provided at the end of the support plate 9, and the link 12 and the guide roller 14 are pivotally supported by the link shaft 13.
The guide piece 20 is such that the guide roller 14 that guides the movement of the door 1 can stably and reliably move along the track. The shape of the guide piece groove 21 provided in the index plate 2 can be determined with reference to the shape of the guide roller groove 19 described above. As for the arrangement of the guide piece 20, the guide portion closer to the center is arranged in front of the end guide roller 14, and the guide portion farther from the center is placed in front of the guide piece 20 at the end. 14 is desirable.
In the figure, although the stability roller 15 is attached to the side part of the link 12, the movement of the door is further stabilized thereby. Further, as shown in FIGS. 8 to 12, 18, and 19, a biting recess 31 (see FIG. 19) is provided on the linear track 17 side at the junction of the inner track 11 and the linear track 17. Since the guide roller groove 19 and the guide piece groove 21 can be deepened, the engagement with the guide piece 20 and the guide roller 14 is further stabilized.

An embodiment of the invention described in claim 5 will be described.
Each component of claim 5 is constructed to complete the following operations.
The door opening process starts from FIG.
In FIG. 8, the index plate 2 rotates in the same direction as the guide roller 14 rotates in the clockwise direction, and starts to extend the spring 4. That is, the operating protrusion 26 fixed to the index plate 2 enters between the long finger 22 and the short finger 23 to push the index finger 5, and the protruding piece 24 of the index finger 5 is formed in the protruding piece guide groove 25 of the index cover 7. The index arm 3 is rotated clockwise while being guided.
In designing the components involved in this, great care must be taken to ensure that the above described rotation can be performed smoothly and stably.

FIG. 9 shows the state where the rotation has progressed and the protruding piece 24 has reached the end of the protruding piece guide groove 25. The actuating projection 26 still proceeds to tilt the index finger 5 a little to lock the protruding piece 24 to the end of the protruding piece guide groove 25. At this time, the spring 4 is stretched and accumulates a repulsive force.
FIG. 10 shows the actuating protrusion 26 moving further and beyond the tip of the short finger 23. The index arm 3 and the index finger 5 stop rotating at this point.

FIG. 11 shows that the index plate 2 continues to rotate after that and the guide roller 14 is separated from the guide roller groove 19 of the index plate 2. Here, the rotation of the index plate 2 is temporarily stopped, and the guide roller 14 enters the linear track 17 of the guide track 10 and proceeds to the left.
FIG. 12 shows a state in which the guide portion far from the center passes through the index R. In that case, in the illustrated example, the guide roller 14 of the guide portion far from the center enters the escape groove 33 provided on the peripheral edge of the index plate 2 following the guide roller groove 19 and further rotates the index plate 2. And then move away from the index R.
Through the above process, the door 1 overlaps the door 2 and is opened.

In the closing process, the above process is performed in the reverse direction.
That is, when the door 1 is moved to the left, the guide portion farther from the center passes through while turning the index plate 2, and the guide portion closer to the center then reaches the index R. The state at that time is shown in FIG. Next, the guide roller 14 pushes the right wall of the guide roller groove 19 to further rotate the index plate 2. When the rotation advances and the operating protrusion 26 pushes the long finger 22, the protruding piece 24 is disengaged from the locking of the protruding piece guide groove 25, and at the same time, the operating protrusion 26 enters between the long finger 22 and the short finger 23.

Then, the unconstrained index arm 3 rotates counterclockwise by the repulsive force accumulated in the spring 4. The rotation of the index arm 3 is transmitted to the index plate 2 via the index finger 5 and the operating projection 26. The index plate 2 moves the guide roller 14 in the guide roller groove 19 counterclockwise (index shaft 8). The door 1 is reliably pulled back to a position where it is flush with the other.
Each of the above components must, of course, be designed to ensure that the described operation is performed.

An embodiment of the invention described in claim 6 will be described.
According to FIG. 17, FIG. 18 or FIG. 19, the damper 28 is connected via the pinion 6 and the gear 27 to the rotating shaft 32 to which the gear 27 is fixed.
However, the connection mode is not limited to this, and other known connection mechanisms may be used. Also, the damper may be any damper as long as it has a function of gradually releasing the repulsive force at the end of the closing process, and various known ones are used.

It is a perspective view when the door 1 and the door 2 are in a closed state. It is a perspective view when the door 1 begins to open. FIG. 6 is a perspective view when both guide portions of the door 1 enter the linear track 17 and the door 1 is in parallel with the door 2. 2 is a plan view of a guide track 10. FIG. It is a schematic diagram which shows the relationship of the three of the doors 1 and 2, the indexes R and L, and the guide track 10 when both doors are in a closed state. It is a schematic diagram which shows the relationship of the said three when the door 1 begins to open. It is a schematic diagram which shows the relationship of the above-mentioned three when the guide part enters the linear track 17 and the door 1 is in a parallel state with the door 2 and is fully opened. FIG. 6 is a plan view when the operating protrusion 26 enters between the long finger 22 and the short finger 23 and starts to rotate the index arm 3 through the protruding piece 24. 7 is a plan view when the index arm 3 is further rotated and the protruding piece 24 reaches the end of the protruding piece guide groove 25. FIG. The operation projection 26 is a plan view when the index finger 5 is slightly tilted so that the protruding piece 24 is locked to the terminal end of the protruding piece guide groove 25 and exceeds the tip of the short finger 23. The operation protrusion 26 continues to rotate away from the index finger 5, and the guide roller 14 is detached from the guide roller groove 19, and the index finger 5 and the index arm 3 are stopped. It is a top view when the guide piece 20 of the guide part far from the center passes through the escape groove 33. FIG. It is a right perspective view which shows the structure of the part involved in accumulation | storage and release of a repulsive force, (a) shows the structure by the side of an index cover, (b) shows the structure by the side of the index base to which an index cover is attached. It is a left perspective view which shows the structure of the part involved in accumulation | storage and release of a repulsive force, (a) shows the structure by the side of an index cover, (b) shows the structure by the side of the index base to which an index cover is mounted | worn. It is a front view of a guide part. It is a side view of a guide part. 3 is a perspective view of a damper 28. FIG. FIG. 3 is an exploded view showing a positional relationship between three members of an index arm 3, an index finger 5 and an index plate 2 fixed to a rotating shaft 32. It is an exploded view in which a spring 4 and an index base 1 are further added to the above three members. It is the schematic diagram which showed the structure which can open and close a door only by adding the manual operation force of one direction, without making it contact | abut to the end surface of an adjacent door or a machine frame.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Index base 2 Index plate 3 Index arm 4 Spring 5 Index finger 7 Index cover 8 Index shaft 9 Support plate 10 Guide track 11 Inner track 12 Link 14 Guide roller 17 Linear track 18 Straight short track 19 Guide roller groove 20 Guide piece 21 Guide piece groove 22 Long finger 23 Short finger 24 Projection piece 25 Projection piece guide groove 26 Actuation projection 28 Damper 29 Outer track

Claims (4)

Slide left or right and one door that opens when the door is opened overlaps the front of the other door or machine frame, and when the door is closed, the one door is flush with the front of the other door or machine frame. In the flat door opening and closing mechanism, a support plate extending in a right angle direction is attached to the upper end edge of the one door, and two guide portions located at an equal distance from the door are provided at the front end edge of the support plate, A guide track that guides the guide portion in a plane parallel to the support plate is provided on the machine frame, and the guide track is curved toward the center when the door is closed, and curved toward the center. A straight line that is formed from an inner track that merges with the track and an outer track that extends obliquely toward the center and merges with the linear track, and extends outward in parallel with the linear track at the end of the outer track. Connect short track, end of inner track and straight short track The two guide portions respectively disposed at a position capable of engaging when closing, and configured so that the length of the lateral direction of the outer track is longer than the length in the horizontal direction of the inner raceway In addition, a disk-shaped index plate having a guide roller groove on the periphery of which the guide roller of the guide portion closer to the center is fitted is attached to the index base so that the guide roller can rotate inward. The peripheral edge of the index plate is arranged so as to overlap the inner track so as to rotate together as it moves from the end of the straight track to the confluence of the linear track , and the initial position of the index plate when the door is opened A repulsive force is accumulated with the rotation of the index plate so that the repulsive force accumulated by the final rotation of the index plate when the door is closed is released. Opening and closing mechanism of the flat door, characterized in that the elastic body was linked to bets. The guide part is formed by a guide roller and a link pivotally attached to the support plate, and a guide piece that moves along the track along with the guide roller is attached to the end part of the link, and the guide roller groove is provided on the periphery of the index plate. 2. The flat door opening and closing mechanism according to claim 1 , further comprising a guide piece groove into which the guide piece is fitted side by side. An index plate and a pivot shaft are mounted on the index shaft established on the index base, an index arm is fixed to the pivot shaft, an index finger is inserted in the gap between the index plate and the index arm, and the index finger is attached to the index finger. The protruding piece that engages the index arm and the finger-like long and short fingers are provided, and the tip of the protruding piece is guided and locked at the end by the index cover mounted on the index base. Protruding piece guide grooves are provided, and an operating projection is provided on the index plate. The operating projection enters between the long finger and the short finger as the index plate rotates, causing the index finger and index arm to rotate. Accumulate repulsive force in elastic When the protruding piece of the index finger reaches the end of the protruding piece guide groove, it is locked at the end, and the operating projection protrudes from the tip beyond the short finger and can be detached from the index finger. The opening / closing mechanism for a flat door according to claim 1 or 2 , characterized in that: 4. A flat door opening and closing mechanism according to claim 1, wherein a damper is connected to the rotating shaft.

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