JP5671215B2 - Automatic door closing device - Google Patents

Description

  The present invention relates to an automatic door closing device for a sliding door.

  There are several types of devices that automatically close an open sliding door. One type of device is a linear rack set horizontally in the upper horizontal frame of the door frame and a sliding door. Some include a door closing driving device that is fixed and operatively connected to the rack to drive the door to close when the door is opened. Specifically, the door-closing drive device includes a casing fixed to the sliding door, a gear that is rotatably attached to the casing and meshes with the rack and rolls along the rack as the sliding door is opened and closed. A holder for maintaining the engagement between the rack and the gear through the rack between the gear and a spring for closing the sliding door as the gear rolls along the rack when the sliding door is opened. A spring device that stores power, and a braking device that applies a brake when the sliding door that has been opened and a human hand is released is closed by the spring device.

  This type of automatic door closing device normally uses the flexibility of a rack formed of metal or hard plastic, and even if the sliding door moves up and down during opening and closing, the rack flexes accordingly and maintains meshing with the gear. The sliding door is not hindered.

  However, in order to perform smooth operation of this automatic door closing device, it is basically necessary to set a straight rack horizontally, and further, the rack should be passed horizontally between the gear and the holder. In addition, it is necessary to fix the automatic door closing device to the sliding door so that the rack insertion passage for passing the rack formed between the gear and the holder is horizontal. For this reason, the setting work is difficult.

  On the other hand, for example, in Japanese Patent Laid-Open No. 11-152955, there is an automatic door closing device in which a door closing drive device is attached to the outer surface of an existing sliding door, and both ends of a rack are attached so as to be movable up and down. An apparatus is disclosed in which it is not necessary to set the rack strictly level. However, even in this type of apparatus, it is necessary to level the rack path defined between the rack and the holder in order to make the operation smooth, and the installation requires skill. .

JP-A-11-152955

  In view of such a point, the present invention can smoothly open and close the sliding door even if the member corresponding to the rack (the door driving cord is used in the present invention) and the door driving device are not set horizontally. An object of the present invention is to provide an automatic door closing device for a sliding door.

The present invention
An automatic closing device for a sliding door,
A door driving cord that does not substantially extend in the length direction and is flexible so that it can be wound, and the upper portion of the door frame extends in the opening / closing direction of the sliding door. A door closing drive cord disposed along the frame portion, and a door closing drive cord having an opening position side end and a door closing position side end;
A closing drive device fixed to the sliding door, wherein the rotating member is rotatably mounted around an axis extending in a direction perpendicular to the opening / closing direction of the sliding door at a fixed position with respect to the sliding door and for driving the closing door. An engagement holding member that engages a cord with the peripheral surface of the rotating member and causes the rotating member to roll on the door-driving cord as the sliding door is opened and closed, and the sliding door from the closed position. The rotary member is moved by rolling on the door closing drive cord with relative movement between the door closing drive cord and the door closing drive device when moved toward the door opening position. A door drive device having a spring device including a spring member that stores a spring biasing force that rolls in a direction opposite to the rolling direction, and
The sliding door has a guided member attached on the upper edge surface near both ends of the upper edge surface in the opening / closing direction, and the guided member extends horizontally facing the upper edge surface of the sliding door. Engaging the guide member provided in the upper frame portion of the door frame, and when the sliding door is opened and closed, it is guided in the opening and closing direction by the guide member,
The door closing drive device is configured to be fitted and set in a setting recess formed on the upper edge surface of the sliding door, and the door closing drive cord is disposed along the guide member in the upper frame portion of the door frame. The opening position side end and the closing position side end are attached to the upper frame of the door frame,
The sliding door automatic closing device further corresponds to each guided member provided on the upper edge surface of the sliding door, on the upper edge surface of the sliding door on the inner side in the opening / closing direction than each guided member. attached, automatic closing device of a sliding door with a code lifting member lifts engaged from the lower side closing driving cord extending the open door position side end and the closed door position side end from the closing drive unit upward I will provide a.

  In this automatic door closing device, the closing drive cord does not substantially extend in the length direction and is flexible so that it can be wound. Even if it is not engaged, an excessive force is not applied to the cord engaged with the rotating member, and rotation of the rotating member on the cord is not hindered.

  Further, since the driving cord is lifted by the cord lifting member provided adjacent to the inner position in the closing direction of the sliding door of the guided member such as a door wheel, the cord and the guided member are not engaged. It is possible to smoothly perform the closing operation of the sliding door.

The cord lifting member includes a supporting member fixed to the upper edge surface of the sliding door, and a roller supported by the supporting member and rotatable about an axis extending horizontally in a direction orthogonal to the opening / closing direction of the sliding door. provided, the roller can be made to lift upward engaged from the lower side thereof to the closing drive cord. By using the roller, friction between the cord and the cord lifting member is reduced, and smooth and quiet opening and closing is possible.

  The door driving cord may have rack teeth provided at a constant pitch along its length direction, and the peripheral surface of the roller may have teeth provided at a pitch that meshes with the rack teeth. . When rack teeth are provided on the cord, smooth and quiet opening and closing is possible by providing such teeth on the rollers.

  The door-closing drive device may have a casing, and the casing may hold the rotating member, the engagement holding member, and the spring device. Thereby, the attachment / detachment of the door closing drive device is facilitated.

  A base part fitted and fixed to a setting recess formed at corners at both upper ends of the sliding door in the opening and closing direction; an upper position supported by the base part and guided by the guide member; A guide bar that is displaceable to a lower position below the position, the support member of the cord lifting member is fixed to the base portion of the guided member, and the base portion is set to the setting recess of the sliding door The cord lifting member can be set by being fitted and fixed to. The guided member and the cord lifting member can be integrated, and their attachment can be simplified.

  In this case, the guided member is supported by the base member that is fitted and fixed to the setting recesses formed at the corners of the upper ends of the sliding door in the opening and closing direction, the support member fixed to the base member, and the support member. The door can be rotated about an axis extending horizontally in a direction orthogonal to the opening / closing direction of the sliding door, and can be guided by the guide member in the opening / closing direction.

  The cord lifting member has a link mechanism that is set as a support member of the lifting member and rotatably supports the roller, and the link mechanism is an upper edge surface of the sliding door when the cord lifting member is attached to the sliding door. A setting member that extends outward from the end of the sliding door in the opening / closing direction of the sliding door, and when the setting member is pushed inward in the opening / closing direction of the sliding door along the upper edge, It can be made to become the setting position. When installing the sliding door in the door frame, there is only a slight gap between the upper edge surface of the sliding door and the upper frame portion. By doing so, the cord lifting member can be easily attached. .

  In this case, it has a member that is connected to the opening position side end of the door closing drive cord and can be expanded and contracted in the opening and closing direction of the sliding door, and the opening position end is attached to the door frame via the extendable member. Can be. This makes it easy to attach the door-driving cord. The extendable member can be a coil spring.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the outline | summary of the sliding door apparatus which attached the automatic door closing apparatus which concerns on this invention, and has shown it partially notching. It is a figure which shows the principal part of the automatic door closing apparatus, (A), (B), (C) shows A, B, C in FIG. 1, respectively. It is a figure which shows the inside of the opening / closing drive device mainly of the automatic door closing device. FIG. 4 is a plan view of the door closing drive device of FIG. 3. It is a figure which shows the relationship between the guide member and to-be-guided member of the automatic door closing device. The 10th Embodiment of the automatic door closing apparatus is shown, (a) is a figure which shows the other aspect of an overwinding prevention member, (b) is the BB sectional drawing. It is a fragmentary sectional view which shows a part of opening / closing drive apparatus shown in FIG. FIG. 8 is an enlarged view of a portion indicated by IIX in FIG. 7. It is sectional drawing which shows other embodiment of an opening / closing drive device. The other modification of the cord lifting member before installing in a sliding door is shown. The state which installed the lifting member of FIG. 10 in the sliding door is shown. Yet another modification of the cord lifting member is shown, showing a state where the cord lifting member is attached to the sliding door but before the final installation state. FIG. 13 is a cord lifting member of FIG. 12 and shows a final installation state. The other modification of a code | cord | chord raising member is shown, Although it is the state attached to the sliding door, the state before becoming a final installation state is shown, (a) is the top view, (b) is a cross-sectional side view is there. The state which installed the lifting member of FIG. 14 in the sliding door is shown, (a) is the top view, (b) is a cross-sectional side view. 14 and 15 show the sliding member, where (a) is a plan view, (b) is a side view, and (c) is a right end view. FIG. FIGS. 14 and 15 show a support member for the cord lifting member of FIG. 14, wherein (a) is a plan view, (b) is a side view, and (c) is a right end view.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  FIG. 1 shows a sliding door device 12 to which a sliding door automatic closing device 10 according to the present invention is attached.

  As illustrated, the automatic door closing device 10 includes a door closing drive cord 18 having a door closing position side end 24 and a door opening position side end 26 fixed to the upper frame portion 16 of the door frame 14, and a sliding door 20. And a closing drive device 22 which is fitted and set in a recess 20-2 provided at a substantially central position of the upper edge surface 20-1 and is operatively connected to the closing drive cord 18.

  The sliding door 20 has a guided member 23 (on the illustrated example, as shown in FIG. 2, the upper edge surface 20-) mounted on the upper edge surface 20-1 near both ends in the opening / closing direction of the sliding door. 1 has a pair of door wheels 23-2) that are rotatably attached to the front and rear of the support member 23-1 that protrudes from 1 and that are respectively arranged on the left and right as shown in FIG. Engaging with a guide member 25 (FIG. 5) provided along the upper frame portion 16 of the door frame 14, the guide member 25 is guided in the opening / closing direction when the sliding door 20 is opened / closed. Yes.

  The closing drive cord 18 does not substantially extend in the length direction, is flexible enough to be wound, and extends in the opening / closing direction (horizontal direction in the illustrated example) of the sliding door 20. The door closing position side end 24 and the door opening position side end 26 at both ends are attached to the upper frame portion 16. Flexibility to the extent that it can be wound is opened and closed because it is made elongated like a rack made of synthetic resin or metal as disclosed in the above-mentioned JP-A-11-152955. It does not mean that the sliding door is flexible enough to move up and down, but it means that the sliding door is flexible enough to be wound up to a diameter of several tens of centimeters, for example. In the prototype made by the inventor of the present application, by using a flexible rack that can be wound to a diameter of about 30 cm, an automatic door closing device that is extremely easy to install and that can be smoothly opened and closed is used. I was able to.

  Specifically, the door driving cord 18 is formed of a hard resin layer provided around a core wire such as steel, and as shown in FIG. 2, the length of the door driving cord is provided on the resin layer. The rack teeth 28 may be formed at a constant pitch along the direction. Eyelets or the like can be attached to the closing position side end portion 24 and the opening position side end portion 26 and attached to the upper frame portion 16 with screws or the like.

  The door closing drive device 22 includes a casing 30 fitted and fixed in the recess 20-2 of the upper edge surface 20-1 of the sliding door 20, a gear 32 as a rotating member rotatably attached to the casing, and a door closing drive. An engagement holding member for engaging the rack teeth 28 of the cord 18 with the teeth 34 of the gear 32 so that the gear 32 rolls along the door closing cord 18 as the sliding door 20 is opened and closed. 36 and a spring spring 37 provided concentrically with the gear 32 on the inner side of the gear 32, and the gear 32 is rotated along with the rolling of the gear 32 when the sliding door 20 is moved from the door closing position toward the door opening position. A spring device in which the spring spring 37 stores a spring biasing force that causes the spring to roll in a direction opposite to the rolling direction.

  Specifically, in the spring device, one end of the spring spring 37 is connected to a shaft body 39 provided coaxially with the gear 32, and the other end is connected to the inner wall surface of the gear 32. As shown in FIG. 2, the shaft 39 has a locking member 42 in one of the locking recesses 52-2 provided on the outer peripheral surface of the spring biasing force adjusting member 52 fixed to the end on the near side. By engaging, it is held at a required angular position. Specifically, the spring urging force adjusting member 52 rotates the shaft body 39 by rotating the shaft 39 by engaging the tip of the driver with a linear groove 52-1 provided in the central portion thereof. The degree of winding of the mainspring around the body is adjusted, and the locking member 42 is formed by bending an elongated spring member, and stands from a horizontal portion 42-1 fixed to the casing 30. By engaging the raised and rounded tip locking portion 42-2 with the concave portion 52-2 of the spring adjustment member 52 rotated by a required amount, the spring adjustment member 52 is locked at the rotational position. It has become.

  The engagement holding member 36 is fixed on the top wall 30-1 of the casing 30, and includes an upper wall 36-2 and a lower wall 36-that define a horizontal cord insertion path 36-1 through which the door closing drive cord 18 passes. Of the casing 30 and the gear 32 facing the code insertion path 36-1 through the lower wall 36-3 of the engagement holding member 36. It is sandwiched between the top wall 30-1 so that the door closing drive cord and the gear teeth 28 and 34 are engaged with each other so as not to come off.

  In the illustrated example, the door closing drive device 22 has a gear 38 meshed with the gear 32, and when the gear 32 is rotated in accordance with the movement of the sliding door 32 toward the door closing position, the rotation is braked. A braking device 40 is provided for braking the sliding door. This braking device is disclosed in, for example, the above-mentioned Japanese Patent Application Laid-Open No. 11-152955 and is well known to those skilled in the art, and thus detailed description thereof is omitted.

  In the illustrated example, an overwinding prevention member 58 for preventing the spring spring 37 from being overwound in the spring device described above is provided. The details of the overwinding prevention member 58 are shown in FIG. 6 and are formed in an annular shape as a whole. The outer circumferential surface of the overwinding preventing member has a large diameter portion 58-1 and a small diameter portion 58-2, and the small diameter portion 58-2 is provided with a plurality of concave portions 62 at equal intervals in the circumferential direction. . The inner peripheral surface 58-3 has a circular shape as a whole, and is fitted to a shaft portion 30-1 protruding from the casing 30 as a second shaft body as shown in FIG. It can rotate around the shaft 30-1. A rotational force resistance member that presses and engages with the outer peripheral surface of the shaft portion 30-1 on the inner peripheral surface 58-3 to provide a resistance force against the rotation of the overwinding prevention member 58 around the shaft portion. 84 are provided at equal intervals. Each rotational force resistance member 84 protrudes inward in the radial direction from the bottom surface of the concave portion 84-2 provided on the inner peripheral surface 58-3, and a tip portion thereof becomes an inner position of the inner peripheral surface 58-3. It is comprised by the convex part 84-1 which was made to press-engage to 30-1. By having this rotational force resistance member, a resistance force in the rotational direction of the overwinding prevention member due to frictional force is applied.

  In contrast to the above-described overwinding prevention member 58, the spring biasing force adjusting member 52 is provided with one convex portion 64 on its outer peripheral surface, and the convex portion is provided each time the spring biasing force adjusting member is rotated once. 64 engages with the recess 62 to rotate the overwinding prevention member 58 by a predetermined angle.

  When the spring biasing force adjusting member 52 is rotated and the convex portion 64 comes into engagement with the large-diameter portion 58-1 without the concave portion 62, even if the spring biasing force adjusting member tries to further rotate, the rotation is It is blocked by the overwinding prevention member 58 to prevent overwinding of the spring.

  As shown in FIG. 8, the convex portion 64 of the spring biasing force adjusting member 52 has a semicircular concave portion 68 formed at the center in the width direction. This is to allow the concave portion 68 to pass over the front end locking portion 42-2 when the convex portion 64 passes through the front end locking portion 42-2 of the locking member 42. is there.

  As shown in FIGS. 1 and 2, the automatic door closing device 10 further includes a cord lifting member 27 attached to the upper frame portion 16 on the inner side in the opening / closing direction than the guided members corresponding to the guided members 23. The cord lifting member 27 is engaged with the closing drive cord 18 extending from the casing 30 of the closing drive device 22 to the opening position side end 26 and the closing position side end 24 from below. The door closing drive cord 18 is not directly engaged with the guided member 23. In this embodiment, the cord lifting member 27 includes a roller 27-2 that is rotatably supported with respect to a support member 27-1 fixed to the upper edge surface of the sliding door. The roller 27-2 can be provided with teeth having the same pitch as the rack teeth provided in the door closing drive cord 18.

  10 and 11 show an example in which the guided member 23 and the cord lifting member 27 are attached to the sliding door 20 by one unit. That is, in the cord lifting member 27, the inverted L-shaped attachment member 27-10 to which the support member 27-1 is fixed is attached to the base portion 23-3 of the support member 23-1 of the guided member 23. The sliding door 20 is fixed by screws, and the base portion 23-3 is fitted into a rectangular setting recess 20-1 formed in the upper corner portion of the sliding door 20 from the side and fixed by an appropriate fixing means. The guided member 23 and the cord lifting member 27 are attached to the head.

  12 and 13 show another embodiment of the guided member 23 and the cord lifting member 27 and a method of attaching the same. The guided member 23 has a rectangular base portion 23-3 similar to that shown in FIGS. 10 and 11, and can be displaced in the vertical direction from the base portion, and is attached to the upper position shown in the figure by a spring 23-5. It has a guided bar 23-4 that is biased. The guided bar 23-4 replaces the door wheel 23-2 in the above-described embodiment, and is guided by the guide member 25 in the sliding door opening / closing direction. The cord lifting member 27 is fixed to the upper surface of the base portion 23-3, extends to the right (as viewed in the figure), and is fixed to the upper edge surface 20-1 of the sliding door, and the base portion 23-3. A sliding member 27-3 slidably mounted in the left and right direction (as viewed in the figure), and a link 27 having one end pivotally attached to the supporting member 27-1 and the sliding member 27-3, respectively. -4, 27-5, and a toothed roller 27-2 attached so as to be rotatable around a pivot axis between the links 27-4, 27-5. When the guided member 23 and the cord lifting member 27 configured as one unit in this way are installed in the sliding door, first, as in the case of FIGS. 10 and 11, the sliding member 20 is formed at the upper corner. The base 23-3 is fitted into the recess 20-1, and the base 23-3 and the support member 27-1 are fixed to the sliding door by an appropriate means to obtain the state shown in FIG. Next, the sliding member 27-3 is pushed to the right (as viewed in the figure), the links 27-4 and 27-5 are folded and the toothed roller 27-2 is raised as shown in FIG. The lifting member 27 is set to the installation position as shown in FIG. When installing the sliding door in the door frame, the guided member 23 is pushed down against the spring 23-5 so as not to hit the upper edge portion of the door frame.

  FIGS. 14 and 15 show still another embodiment of the guided member 23 and the cord lifting member 27. This embodiment is basically the same as that shown in FIGS. 12 and 13, with the toothed roller 27-2 around the pivot axis of the links 27-4 and 27-5. The toothed roller 27-2 is attached to the toothed roller 27-2 by pushing the sliding member 27-3 from the position shown in FIG. 14 (b) to the position shown in FIG. 15 (b). It is supposed to be the installation position. In this embodiment, unlike the embodiment of FIGS. 12 and 13, a pair of guide disks 27-6 is provided at both ends of the rotation shaft of the toothed roller 27-2 so as to sandwich the roller. The door closing drive cord 18 that is engaged with and lifted by the toothed roller 27-2 is prevented from being detached from the toothed roller 27-2. Further, the link 27-5 is provided at one end thereof, and a connecting rod 27-8 extending horizontally is provided at the right end of the sliding member 27-3 so that it can slide in the second recess 20-2 of the door wheel. Is supported in a vertically movable slot 27-13 formed in the support portion 27-7 so that the slide member 27-3 is pushed in, so that the support portion 27-7 is a second recess. When being slid to the right in 20-2, the cam member 27-9 set in the second recess 20-2 is guided to the position shown in FIG. 15B. Yes. In the drawing, reference numeral 27-11 denotes a slot formed in the sliding member 27-3 for passing the guided member 23, and 27-12 pivotally supports one end of the link 27-4 to the support member 27-1. The pivotal part of

  That is, in the door closing drive device 22 according to this embodiment, the overwinding preventing member 58 is not provided. The spring urging force adjusting member 52 has a hexagonal shape, and the locking member 42 is formed into a C shape by bending a long and slender spring member, and a parallel portion of the side surface 52-facing the locking member. 3, the angular position of the spring biasing force adjusting member 52 is fixed.

  A special feature of this embodiment is that a coil spring 44 is attached to the opening position side end portion 26 of the door closing drive cord 18, and the opening position position side end portion 26 is connected to the upper frame portion 16 via the coil spring. It is attached.

  By doing so, the cord can be set without sagging by attaching the door-driving driving cord to the upper frame portion with the coil spring slightly extended. Further, the mounting position is not limited by the coil spring, and can be easily installed.

  Although the embodiment of the present invention has been described, the present invention is not limited to this. For example, a gear as a rotating body may be a V-shaped pulley, and a closing drive cord may be a V-belt. Is possible.

Automatic door closing device 10; Sliding door device 12; Door frame 14; Upper frame portion 16; Door closing drive cord 18; Sliding door 20; Upper edge surface 20-1; Recess 20-2; Door 23-2; Base 23-3; Guided bar 23-4; Spring 23-5; Door closing position side end 24; Guide member 25; Door opening position side end 26; Cord lifting member 27 Support member 27-1, roller 27-2, sliding member 27-3, link 27-4, 27-5, guide disk 27-6, support portion 27-7, connecting rod 27-8, cam member 27- 9; mounting member 27-10; slot 27-11; pivot 27-12; slot 27-13; rack tooth 28; casing 30; gear 32; tooth 34; engagement holding member 36; Body 39; braking device 4 0; coil spring 44; spring biasing force adjustment member 52; groove 52-1; locking recess 52-2; overwinding prevention member 58;

Claims (9)

An automatic closing device for a sliding door,
A door driving cord that does not substantially extend in the length direction and is flexible so that it can be wound, and the upper portion of the door frame extends in the opening / closing direction of the sliding door. A door closing drive cord disposed along the frame portion, and a door closing drive cord having an opening position side end and a door closing position side end;
A closing drive device fixed to the sliding door, wherein the rotating member is attached to the sliding door so as to be rotatable about an axis extending in a direction perpendicular to the opening / closing direction of the sliding door at a fixed position with respect to the sliding door, and the closing drive cord Is engaged with the peripheral surface of the rotating member so that the rotating member rolls on the door closing drive cord as the sliding door is opened and closed, and the sliding door is opened from the closed position. The rotating member is moved by rolling on the closing drive cord with relative movement of the closing drive cord and the closing drive device when moved toward the door position, and the rotating member is moved by the rotation. A closing device having a spring device having a spring member that stores a spring biasing force that rolls in a direction opposite to the movement,
The sliding door has a guided member attached on the upper edge surface near both ends of the upper edge surface in the opening / closing direction, and the guided member extends horizontally facing the upper edge surface of the sliding door. Engaging the guide member provided in the upper frame portion of the door frame, and when the sliding door is opened and closed, it is guided in the opening and closing direction by the guide member,
The door closing drive device is configured to be fitted and set in a setting recess formed on the upper edge surface of the sliding door, and the door closing drive cord is disposed along the guide member in the upper frame portion of the door frame. The opening position side end and the closing position side end are attached to the upper frame of the door frame,
The sliding door automatic closing device further corresponds to each guided member provided on the upper edge surface of the sliding door, on the upper edge surface of the sliding door on the inner side in the opening / closing direction than each guided member. attached, automatic closing device of a sliding door with a code lifting member lifts engaged from the lower side closing driving cord extending the open door position side end and the closed door position side end from the closing drive unit upward .   The cord lifting member is fixed to the upper edge surface of the sliding door, and the roller is supported by the supporting member and is rotatable about an axis extending horizontally in a direction perpendicular to the opening / closing direction of the sliding door. The automatic door closing device for a sliding door according to claim 1, wherein the roller engages with the door closing drive cord from below and is lifted upward.   3. The door closing cord has rack teeth provided at a constant pitch along the length direction thereof, and the peripheral surface of the roller has teeth provided at a pitch engaging with the rack teeth. Automatic sliding door closing device.   The automatic door closing device for a sliding door according to any one of claims 1 to 3, wherein the door closing drive device has a casing, and the casing holds the rotating member, the engagement holding member, and the spring device. .   A base part fitted and fixed to a setting recess formed at corners at both upper ends of the sliding door in the opening and closing direction; an upper position supported by the base part and guided by the guide member; A guide bar that is displaceable to a lower position below the position, the support member of the cord lifting member is fixed to the base portion of the guided member, and the base portion is set to the setting recess of the sliding door The automatic door closing device according to any one of claims 1 to 4, wherein the cord lifting member is set by being fitted and fixed to.   A guided member is fitted and fixed to a setting recess formed at corners at both upper ends of the sliding door in the opening and closing direction, a supporting member fixed to the base, and supported by the supporting member, A door wheel that is rotatable about an axis that extends horizontally in a direction orthogonal to the opening and closing direction, and that is guided by the guide member in the opening and closing direction, and the support member of the cord lifting member is the guide member The automatic door closing device according to any one of claims 1 to 4, wherein the cord lifting member is set by being fixed to a base and fitting and fixing the base to a setting recess of the sliding door. The cord lifting member has a link mechanism that is set as a support member of the lifting member and rotatably supports the roller, and the link mechanism is configured so that when the cord lifting member is attached to the sliding door, The link mechanism has a setting member extending outward in the opening / closing direction of the sliding door from the end of the upper edge surface, and the link mechanism is pushed inward in the opening / closing direction of the sliding door along the upper edge surface. The automatic door closing device according to claim 2 or 3 , wherein the roller rises and the roller is set to a predetermined setting position.   It has a member that is connected to the opening position side end of the door closing drive cord and can be expanded and contracted in the opening / closing direction of the sliding door, and the opening position end is attached to the door frame via the expandable member 8. The automatic door closing device for a sliding door according to claim 1, wherein the sliding door is automatically closed. The automatic door closing device for a sliding door according to claim 8, wherein the extendable member is a coil spring.

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