JPH11152957A - Automatic open-close sliding door device by body-load starting - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a new automatic open-close sliding door device, in which lack of quick response to stepping-in operation and the insufficiency of operation reliability resulting from the change of equipment environment are solved and which can be opened and closed manually and unforcedly in the same manner as a normal manual sliding door without being affected by the emergency trouble of a transmission mechanism even in the trouble and has high realizability and is started by body load. SOLUTION: The automatic open-close sliding door device has a sliding door 1, which is slidably hung down and supported in the open-close direction and moving urging force in the closing direction is applied, and treads 5 arranged on floor faces at the front-rear places of the sliding door 1 at a closing place respectively and constituted so as to generate settlement in a fixed quantity by body load. The automatic open-close sliding door device consists of transmission mechanisms transmitting the quantities of the treads 5 settled as the quantities of strokes in fixed quantities, conversion mechanisms being disposed on the opening pulling-in side of the sliding door 1 and converting the quantities of the strokes into the rotation of pulleys 12 at the fixed angles of rotation, and drag wires 15, in which one end sides are wound on the pulleys 12 and the other end sides are clamped to the sliding door 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a body load-activated automatic opening / closing sliding door apparatus for opening and closing a sliding door at an entrance by stepping on the weight of a human being to step on the door.

[0002]

2. Description of the Related Art Conventionally, a mechanism for opening and closing a sliding door at an entrance as a load displacement and a power source by a stepped human body load without using an additional power source such as an electric motor has been proposed. There were numerous applications.

For example, displacements due to loads are replaced with changes in hydraulic pressure or fluid pressure such as air pressure.
Japanese Patent Publication Nos. Sho 59-35754, Sho 54-38645, Sho 58-54178 and Sho 58-54178 disclose a method of opening a sliding door by operating a piston mechanism (hydraulic method).
JP-A-6-37482 and JP-A-7-286476.
No., etc. exist.

[0004] However, these hydraulic systems are advantageous in that they can freely transmit the amount of displacement caused by depressing, and are suitable for transmitting an operating force (opening operating force) by compressing an expandable body. The return of the telescopic body to its original size by the door (door closing operation) has a drawback that it is difficult to perform smoothly.
For this reason, another acting force means is provided or a valve is provided in the flow path, but lacks quick response with good responsiveness, and frequent ingress and egress has been troublesome. In addition, those using hydraulic pressure, etc., are affected by the surrounding air temperature, and especially when exposed to the outdoors, not only had the inconvenience that the opening and closing response differs depending on the season, but also the problem of freezing obstacles in the liquid path became a problem. Construction was still problematic.

[0005] Separately, a guide rail arranged above or below a sliding door is appropriately inclined in a desired moving direction by using a link mechanism with respect to a displacement amount due to stepping, and the sliding door is slid along this inclination (inclination). For example, Japanese Utility Model Laid-Open No. 2-2479 or Japanese Utility Model Laid-open No. 6-3
No. 7482, and the like.

However, in such a tilting method, since the movement relies only on natural movement on a slope caused by the weight of the sliding door, it is difficult to perform quick movement with good responsiveness as described above.
Frequent entry and exit was troublesome. In addition, when dust or the like is accumulated on the guide rail due to long-term use, there is a disadvantage that the dust is greatly affected by the dust.

[0007] In addition, in the case of any of the above-mentioned hydraulic system and the inclination system, if any failure occurs in the operating force transmission mechanism having the above-mentioned structure, it is impossible or very difficult to manually open and close the mechanism. There was also a disadvantage that there was.

[0008]

SUMMARY OF THE INVENTION Therefore, the present invention solves such problems, that is, inadequate responsiveness to a stepping action, and lack of operation reliability due to a change in an installation environment. Another object of the present invention is to provide a novel and highly feasible body-load-activated automatic opening / closing sliding door device which can be easily and manually opened and closed similarly to a normal manual sliding door without being affected by this.

[0009]

In order to achieve the above object, the present invention is configured as follows. That is, the sliding door is slidably supported in the opening and closing direction and is suspended and supported, and the sliding door to which the moving urging force is applied in the closing direction is disposed on the floor surface at the front and rear positions of the sliding door in the closed position. A tread plate configured to cause a fixed amount of squat, and a transmission mechanism that transmits the squat amount of the tread plate as a predetermined stroke amount,
A conversion mechanism disposed on the open draw-in side of the sliding door to convert the stroke amount into rotation of a pulley having a predetermined rotation angle; and a flexible length having one end wound around the pulley and the other end fastened to the sliding door. And a length member.

A plurality of sliding doors slidably supported in a sliding direction in the opening and closing direction, and supported by being suspended in a closing direction, and applied with a moving biasing force in a closing direction. A tread plate arranged on the floor in front of and behind the sliding door in the closed position and configured to cause a predetermined amount of settlement by body load, and a transmission for transmitting the settlement amount of the tread plate as a predetermined amount of stroke A mechanism, a conversion mechanism that is arranged on the open draw-in side of the sliding door and converts the stroke amount into rotation of a pulley having a predetermined angle, and the pulley is formed integrally with a plurality of pulleys coaxially. One end side is wound, and the other end side is a flexible long material fastened to each of the sliding doors.The diameter of each pulley is set so that each linked sliding door overlaps at the time of open retraction. The size is set in consideration of And wherein the door.

A sliding door slidably supported in a sliding direction in the opening and closing direction, and to which a moving biasing force is applied in a closing direction;
A tread plate arranged on the floor in front of and behind the sliding door in the closed position and configured to cause a predetermined amount of subsidence due to body load, and a transmission mechanism for transmitting the subsidence amount of the tread plate as a predetermined amount of stroke amount And an enlargement mechanism that is arranged on the open retracting side of the sliding door and engages with the transmission mechanism to increase the stroke amount and move the stroke amount downward, and locks one end to a downward moving portion of the enlargement mechanism, A flexible long material having the other end locked to the sliding door.

In the above-mentioned structure for applying the moving urging force, a guide rail which is inclined downward in the closing direction along the moving direction above the sliding door is arranged, and the sliding door is slidably supported by the guide rail. Thus, the urging force for moving in the closing direction may be added.

[0013] The transmission mechanism includes, for example, a seesaw-shaped balance member arranged at a lower portion of a floor surface, and applies a force from a tread plate to one end of the balance member, and slides substantially vertically in the other end side. By connecting the lower ends of the push-up rods that are arranged as possible, the movement amount of the push-up rod is transmitted as a stroke amount.

Further, the conversion mechanism has a configuration in which, for example, a rack is formed on the upper end side of the push-up rod, and the pulley is rotated via a pinion that meshes with the rack. As an example of the above-mentioned enlargement mechanism, a swing arm composed of a balance member supporting an unbalanced fulcrum is disposed on the retracted side of the sliding door, and the stroke amount from the transmission mechanism is transmitted to the stem of the swing arm, and the swing arm is moved by the unbalance movement. The moving arm tip is configured to be moved downward.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is an overall perspective view schematically showing a configuration of the first embodiment, and FIG. 2 is a front view of a main part showing an operation state of the first embodiment. FIG. 3 is an overall perspective view schematically showing the configuration of the second embodiment.

[0016]

Embodiment 1 Embodiment 1 shows a configuration in which one sliding door 1 is provided. The sliding door 1 has two hanging hooks at its upper end.
A runner roller 2r, which is rotatably supported via a shaft, is mounted on the guide rail 3 by rolling it along a guide rail 3 arranged in the opening and closing direction above the sliding door 1. It is slidable along.

The guide rail 3 is inclined downward in a door closing direction (door stop direction). In addition, this inclination angle is sliding door 1.
Is appropriately set according to the weight of the door and the desired closing speed. At the position of the floor 4 in front of and behind the sliding door 1 when the door is closed, a tread plate 5 of an appropriate shape is arranged substantially flush with the floor 4.
The tread plate 5 is moved by a predetermined amount (about 10 to 15
mm) sinks.

From the lower part of the tread 5, open the retraction side (“door pocket 6
A transmission mechanism that transmits the amount of depression of the tread plate 5 as a predetermined stroke amount (movement amount) is disposed. That is, a receiving roller 7 a made of a roller bearing that abuts on the lower surface of each tread plate 5 is disposed on the upper surface of the receiving member 7 supporting the cantilever pin, and the tip end of each receiving member 7 is a seesaw-shaped balance member 8. One end is in contact with the upper surface. The other end of the balance member 8 is link-coupled to a lower end of a push-up rod 9 arranged in a substantially vertical direction through a pin connecting portion 9p in the middle.

The push-up rod 9 is urged upward by a pulling means such as a coil spring 10 on the upper side of the pin connecting portion 9p, and is freely slidable in the vertical direction by a guide 11 fixed to the door pocket 6 side. It is kept on.

As a conversion mechanism for converting the stroke amount of the push-up rod 9 into the rotation of the pulley 12 having a predetermined angle, a rack 9r is formed at the tip of the push-up rod 9, and the pinion 13 meshed with the rack 9r. Through the pulley 12
And the shaft gear 14 attached to the rotating shaft of the first embodiment.

The pulley 12 is rotatably supported by a shaft at an appropriate position above the sliding door 1, and a pulling wire 15 as a flexible long material is wound around the outer periphery thereof. The end side is fastened to the upper part of the sliding door 1 via the mounting member 16. In addition, this flexible long material is not limited to the above-described pulling wire 15, but may be a string, a belt, a band, a hollow, if it has flexibility (a material that can be bent or bent freely). , Etc. may be selected and used.

A weight 19 is attached to the sliding door 1 via a linking wire 17 extending to the door pocket 6 and a pulley 18 to apply a moving urging force (tension) to the door pocket 6 side. The weight 19 is not essential, but is used to smooth the opening movement of the sliding door 1 and to adjust the moving speed when the door is closed, and is appropriately set.

[0023]

The operation of the first embodiment will be described below. When a person who walks toward the sliding door 1 steps on the tread plate 5, the tread plate 5 sinks down by a predetermined amount D (about 10 to 15 mm in the embodiment) with its weight (arrow a). That is, since a load is applied to the receiving roller 7a contacting the lower surface of the tread plate 5, one end of the balance member 8 is pushed down through the receiving member 7 (arrow b), and the other end moves upward in conjunction with this. Then, the push-up rod 9 is pushed up (arrow c). At this time, depending on the setting of the position of the fulcrum 8c of the balance member 8, the magnification of the upward linear movement amount (stroke amount) S of the push-up rod 9 with respect to the settlement amount D is determined.

Push-up movement of push-up rod 9 (arrow c)
Is converted into the rotation of the pulley 12 via the rack 9r, the pinion 13, and the shaft gear 14 (arrows d and e), and the rotation pulls the pulling wire 15 to draw the sliding door 1 into the door pocket 6 side ( Arrow f).

In this embodiment, the sinking amount D of the tread 5 is about 15
mm, the fulcrum 8c of the balance member 8 is set so that the stroke amount S at this time is about 50 mm, and the rack 9r, the pinion 13, and the shaft are so rotated that the pulley 12 (diameter about 25 cm) rotates about one turn. The number of teeth of the gear 14 is set. One rotation of the pulley 12 causes the half-way sliding door 1 to be opened.

The receiving roller 7a of this embodiment is provided for smoothly moving the tread plate 5 up and down. However, the receiving roller 7a may be modified as appropriate or omitted if unnecessary. Is also possible.

Next, when the load on the tread plate 5 is released after passing by the person, the push-up rod 9 falls downward (arrow g) by its own weight and returns to the original position, and the sliding door 1 is moved to the guide rail 3 It moves in the closing direction according to the inclination (arrow h).

In the above operation step, since the coil spring 10 pulls the push-up rod 9 upward with an elastic force, the coil spring 10 acts to urge the push-up rod 9 during the push-up movement and also to alleviate a sudden drop during the fall. I have.

Since the weight 19 acts as a biasing force (arrow i) in the direction of pulling the sliding door 1 in the direction of the door pocket 6, the weight 19 is urged to open and moves with a lighter force and good responsiveness. On the other hand, when the door is closed, the door is prevented from suddenly hitting due to the acceleration of the slope movement, and is adjusted to a moderate speed to move the door closed.

Further, when the sliding door 1 is moved in the opening direction by hand, the pulling wire 15 which is a flexible material is flexed and can be moved along the guide rail 3 without any resistance.

[0031]

Embodiment 2 Next, Embodiment 2 shows a case in which the sliding doors 20 are composed of a plurality of sliding doors, and two sliding doors 20a and 20b are arranged in a substantially planar shape by overlapping near the ends of each other. It has a wide open frontage. Here, the configuration of the tread plate 5, its receiving member 7, the balance member 8 as the transmission mechanism, the push-up rod 9, the rack 9r as the rotation conversion mechanism, the pinion 13, and the shaft gear 14 are the same as those of the first embodiment. Since the configuration is the same as that described above, the same reference numerals are given on the drawings, and detailed description thereof will be omitted.

In the second embodiment, the structure of the pulley 21 is different. In the first embodiment, the single pulley 12 is used, but in the second embodiment, a plurality of pulleys 21 corresponding to the number of the sliding doors 1 are coaxially overlapped and fixed to be integrated. Although the pulleys 21 rotate at the same rotation angle, respective diameters are set in consideration of a required movement amount of the linked sliding door 20. For example, since the A sliding door 20a requires a movement amount approximately twice as large as the B sliding door 20b, the diameter of the pulley 21 linked to the A sliding door 20a is approximately twice the diameter of the pulley 21 linked to the B sliding door 20b. Is set to

The weight 19 is attached to each of the A and B sliding doors 20a and 20b. Although the guide rail 3 is constituted by one in the second embodiment, the two sliding doors 1 substantially overlap at the time of opening and retracting.
The hanging hooks 2 are arranged so as not to interfere with each other. Alternatively, a guide rail may be separately provided for each sliding door 1.

[0034]

The operation of the second embodiment is basically the same as that of the first embodiment. However, since the pulleys having different diameters are set for each sliding door 1, the respective movement amounts are the same even at the same rotation angle. In contrast, when the sliding doors 1 are drawn into the door pocket 6, the two sliding doors 1 are almost overlapped. As a result, an opening frontage for approximately two sliding doors is secured.

[0035]

Third Embodiment Next, a third embodiment is a modification of the first embodiment, in which the stroke amount transmitted by the transmission mechanism is converted into a downward moving force together with the enlarged movement amount via the enlargement mechanism. The sliding door is pulled by a flexible elongate material by a downward moving force and is drawn into the door pocket.

Hereinafter, a third embodiment will be described in detail with reference to the accompanying drawings. Components similar to those in the first and second embodiments are denoted by the same reference numerals in the drawings, and description thereof will be omitted. . FIG. 4 is an overall perspective view schematically showing a configuration of the third embodiment, FIG. 5 is an overall front view showing an operation state, and FIGS. 6 and 8 are main part front views thereof. FIG. 7 is a front view showing a modification of the main part shown in FIG.

Two balance members 31 constituting the transmission mechanism are arranged in a substantially Y-shape, and the base 31b thereof is engaged with the lower end 32d of the push-up rod 32, and each of them is connected to the unbalanced fulcrum 31c. It is operably supported by a seesaw, and each of its tip portions 31t is arranged in contact with the lower surface of a substantially central portion of the two tread plates 5, 5 arranged at the front and rear positions via receiving roller 31r.

The push-up rod 32 is, as in the first embodiment,
It is allowed to move upward and is held by the guide 33, and a downward moving force is applied by the adjusting weight 32 w and an upward pulling force is applied by the tension spring 34. The adjustment weight 32w and the tension spring 34 are optional, and the adjustment weight 32w is
In order to assist the downward movement of the step 2 and to hold the tread plate 5 at the upper position, the tension spring 34 has a load amount set to alleviate the sudden downward movement of the push-up rod 32. .

Next, as an enlarged mechanism, as shown in the figure, the swing arm 35 composed of a rod-like member supported at an unbalanced fulcrum unequal distance from both ends is connected to the retracting side 6 (door pocket side) when the sliding door is opened. ) At a position that does not interfere with the sliding door 1, and the base (short distance end side from the fulcrum) 35 of the swing arm 35
b and the push-up rod 32 are engaged. The engagement is provided on the middle side surface of the push-up rod 32.
2t, the stem 35b of the swing arm 35 is brought into contact with the engagement protrusion 32t from below, and the stem 35b
The upper part of the engaging projection 32t of the push-up rod 32 is connected by a spring 36.

The push-up rod 32 and the swing arm 35
As shown in FIG. 7, in addition to the above-described configuration, a long hole 35h is opened in the trunk 35b of the swing arm 35, and the engagement protrusion of the push-up rod 32 is formed in the long hole 35h. 3
2t may be penetrated and engaged.

A balance weight 35w capable of adjusting the sliding movement is attached to the trunk shaft of the swing arm 35 at the tip end 35t side (the long-distance end side from the fulcrum), and the pulley 35p is attached to the tip end 35t. Is rotatably mounted. A pulling wire 37 as a flexible long material is slidably hung on the pulley 35p, and a weight 38 as a downward load is attached to an end of the pulling wire 37 in a suspended manner. (See FIG. 8). On the other hand, the other end of the pulling wire 37 is locked to the upper end of the sliding door 1 via a guide pulley 39 arranged at the upper part on the door pocket side.

[0042]

Operation of Embodiment 3 With the above configuration, Embodiment 3 operates as follows. When a person approaches the sliding door 1 and steps on the tread plate 5, the pushing force (arrow k) due to the body load acting on the tread plate 5 acts on the receiving roller 31r, and the balance member 31 operates the seesaw to move the push-up rod 32. Push up (arrow 1). As a result, when the engagement protrusion 32t moves upward (arrow m) to release the engagement of the base 35b of the swing arm 35, the movement of the unbalanced swing arm 35 and the tension of the tension spring 34 are combined. The seesaw operates, and the tip 35t moves downward (arrow n). By this downward movement (arrow n), the pulley 3
The weight 38 of the pulling wire 37 hung by 5p acts as a stopper, pulls down the pulling wire 37 downward, and the pulling force pulls the sliding door 1 into the door pocket side 6 (arrow o).

Next, when the depression of the tread plate 5 is released (after the passage of a person), the push-up rod 32 moves downward (arrow p) due to the total load of its own weight and the adjustment weight 32w. As a result, the engagement protrusion 32t is
5, the base 35b is pushed down (arrow q), and the tip 35t moves upward (arrow r) by the seesaw operation. At this time, since the pulling wire 37 is slidably hung on the pulley 35p, the weight 38 attached to the tip of the pulling wire 37 and the guide rail 3 inclined and disposed.
The sliding door 1 slowly moves (arrow s) in the closing direction along the guide rail 3 while the inclination moving force of the sliding door 1 is balanced.

When the configuration shown in FIG. 7 is employed, the swinging arm 32t is linked by the upward moving force (arrow t) of the engaging projection 32t because the engaging projection 32t is linked to the elongated hole 35h. The tip 35t of 35 is moved downward (arrow u).

If the sliding door 1 is manually opened when the tread plate 5 does not operate for any reason or when the push-up rod 32 does not move upward, the swing arm 35 does not operate. 3 of the pull wire 37
7 l result. The loose pulling wire 37 is connected to the pulley 35
The weight 37 moves downward (arrow v) due to the weight of the weight 38 via p and the guide pulley 39, and the slack 371 is absorbed (see FIG. 8).

[0046]

[Effect] Since the present invention is configured as described above,
The sliding door can be quickly moved in the opening direction in response to the depression operation of the tread plate. In addition, since the moving urging force is applied to the movement of the sliding door in the closing direction, there is no need to apply an external force for closing the sliding door. Further, by using a plurality of sliding doors, a wide open frontage can be easily secured.

According to the third aspect of the present invention, since the number of components can be reduced with a simple structure, it is possible to provide a more reliable device with no failure. When the structure described in claim 4 is adopted as the means for applying the moving urging force, a simple structure utilizing the own weight of the sliding door can be obtained, and the urging force can be easily set by appropriately setting the inclination angle. Can be adjusted.

In the case where the transmission mechanism has the structure described in claim 5, since a rigid material is used, a quicker response can be ensured. When the configuration described in claim 6 is employed for the conversion mechanism, a simple and reliable configuration can be achieved by selecting a pinion or a pulley,
There is an advantage that the setting of the retraction speed and the retraction force can be easily changed.

Further, since the retraction is based on the pulling of the flexible long material, a failure occurs in a transmission mechanism such as a balance member, a push-up rod, or a conversion mechanism such as a rack, a pinion, or a pulley for some reason. Even if automatic opening and closing cannot be performed, there is an advantage that the opening and closing can be performed manually without difficulty.

As described above, since the opening / closing sliding door device having such a remarkable effect is of the type in which the opening and moving is performed by the body load at the time of stepping on a person, it is difficult to secure electric power for the electric motor. It has the effect that it can be easily constructed on outdoor simple buildings.

[Brief description of the drawings]

FIG. 1 is an overall perspective view schematically showing a configuration of a first embodiment.

FIG. 2 is a front view of a main part showing an operation state of the first embodiment.

FIG. 3 is an overall perspective view schematically showing a configuration of a second embodiment.

FIG. 4 is an overall perspective view schematically showing a configuration of a third embodiment.

FIG. 5 is an overall front view showing an operation state of the third embodiment.

FIG. 6 is a main part front view showing an operation state of the third embodiment.

FIG. 7 is a front view showing a modification of the main part shown in FIG.

FIG. 8 is a front view of a main part showing an operation state of the third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sliding door 2 Hanging hook 2r Runner roller 3 Guide rail 4 Floor surface 5 Tread plate 6 Open draw-in side (door bag side) 7 Receiving member 7a Receiving roller 8 Balance member 8c Support point 9 Push-up rod 9p Pin connecting part 9r Rack 10 Coil spring 11 Guide REFERENCE SIGNS LIST 12 pulley 13 pinion 14 shaft gear 15 pulling wire 16 mounting member 17 linking wire 18 pulley 19 weight 20 sliding door 20a A sliding door 20b B sliding door 21 pulley (from the second embodiment) 31 balance member 31c unbalanced fulcrum (of balance member) 31r Receiving part roller 32 Push-up rod 32d Lower end (of push-up rod) 32t Engagement protrusion 33 Guide 34 Tension spring 35 Swing arm 36 Spring 37 Towing wire 38 Weight 39 Guide pulley

Claims (7)

[Claims] 1. A sliding door slidably supported in a sliding direction in an opening and closing direction and supported by a movable door in a closing direction, and a floor disposed at a front and rear position of the sliding door in a closed position. A tread plate configured to generate a predetermined amount of squat by a load; a transmission mechanism for transmitting the squat amount of the tread plate as a predetermined amount of a stroke amount; and An automatic body load activation device, comprising: a conversion mechanism that converts the rotation into the rotation of a square pulley; and a flexible long material having one end wound around the pulley and the other end fastened to the sliding door. Sliding door device. 2. A plurality of sliding doors slidably supported in a sliding direction in an opening and closing direction, supported by being suspended in a closing direction, and applied with a biasing force in a closing direction. A tread plate arranged on the floor in front of and behind the sliding door in the closed position and configured to cause a predetermined amount of settlement by body load; and a transmission for transmitting the settlement amount of the tread plate as a predetermined stroke amount. A conversion mechanism, which is disposed on the open draw-in side of the sliding door and converts the stroke amount into the rotation of a pulley having a predetermined angle, wherein the pulley has a plurality of pulleys integrally formed coaxially, and each pulley has One end side is wound around each other, and the other end side is made of a flexible long material fastened to the respective sliding doors. The diameter of each pulley is set so that each linked sliding door overlaps at the time of open retraction. The size should be set in consideration of Automatic opening and closing sliding door device body load boot according to claim. 3. A sliding door slidably supported in a sliding direction in an opening and closing direction and supported by a suspension and to which a biasing force is applied in a closing direction, and a floor disposed at a front and rear position of the sliding door in a closed position. A tread plate configured to cause a predetermined amount of subsidence by a load; a transmission mechanism that transmits the subsidence amount of the tread plate as a predetermined amount of stroke amount; and a transmission mechanism that is disposed on the open retracting side of the sliding door and engages with the transmission mechanism. An enlargement mechanism for increasing the stroke amount and moving the stroke downward, and a flexible elongate member having one end locked to a downward moving portion of the expansion mechanism and the other end locked to the sliding door. An automatic opening / closing door device which is activated by body load, characterized by comprising: 4. A movement in a closing direction by arranging a guide rail inclined in a closing direction along a moving direction above the sliding door and slidably supporting the sliding door on the guide rail. 4. An automatic opening / closing sliding door apparatus according to claim 1, wherein an urging force is applied. 5. A transmission mechanism, wherein a seesaw-shaped balance member is arranged at a lower portion of a floor surface, a force from a tread plate is applied to one end of the balance member, and the other end is slidable in a substantially vertical direction. 4. The automatic body load activation method according to claim 1, wherein the lower end portion of the disposed push-up rod is connected to transmit a movement amount of the push-up rod as a stroke amount. Sliding door device. 6. The conversion mechanism according to claim 1, wherein a rack is formed on the upper end side of the push-up rod, and the pulley is rotated via a pinion that meshes with the rack. Automatic opening and closing sliding door device that starts with body load. 7. A magnifying mechanism, wherein a swing arm comprising a balance member supporting an unbalanced fulcrum is disposed on a retracting side of the sliding door, and a stroke amount from the transmission mechanism is transmitted to a stem of the swing arm, and the unbalanced movement is performed. 4. The automatic opening / closing sliding door device according to claim 3, wherein the tip of the swing arm is moved downward.