JP3556892B2 - Door locking device for automatic opening and closing door - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to those with door locking means a door locking device in an automatic door.
[0002]
[Prior art]
Any of various has been proposed in to as door locking devices. For example, Japanese Unexamined Utility Model Publication No. 6-58048 discloses an overall configuration as shown in FIG . 3 and a door lock means as shown in FIG. Automatic door of FIGS. 3 and 4, it transmits the rotation of the motor a deceleration mechanism b, connecting this with the rotating driving pulley c and the driven pulley d and over hung around the endless belt e the door f This is run openably and closably in the left and right directions under the guidance of a running rail (not shown) . The automatic door of the conventional example is different from the general-purpose motor that Ru is projected the first output shaft g1 only one side, it adopted the first special motor a second output shaft g1, g2 are oppositely arranged on both sides, and, or so as to transmit power to the speed reduction mechanism b in the first output shaft g1, constitute a door locking means or adding such specific components of FIG. 4 to the second output shaft g2.
[0003]
To explain the conventional example above further fitted a shaft hole i of the constraint sprocket h such shown in FIG. 4 (B) to the second output shaft g2 of the motor a, the energization of the electromagnetic solenoid j provided separately place and the plunger k is infested operated in a non-energized, thereby infested the through guide hole p of the guide block n the constraining rod m which projects from the plunger k. Thus, the restraining rod m can be freely inserted into the interdental space r between the sprocket claws q of the restrained sprocket h . Since this rotation of the restrained sprocket h is prevented by the rotation of the motor a is prevented from locking state of the door f Ru is ensured.
[0004]
Conventional example above, like this, the motor a do not need to adopt a special motor rather than a general-purpose motor is expensive, that Do and private parts also need separately, such as the restrained sprocket h and the guide block n. Accordingly, the cost is considerably increased, and a considerable amount of labor and time is required for the assembling work. And special motor production process is complicated, because standard components are not available, properly reduced fiddle productivity efficiency.
[0005]
On the other hand, a door locking device using an electromagnetic brake S as shown in FIG. 5 is also known. The configuration is as follows. The conventional example of FIG. 5 also requires a special motor a . In Figure 5 the first output shaft g1 is connected to the deceleration mechanism b, power spring u is interposed between the movable plate t and the motor a, which is fitted through the second output shaft g2. Rotating friction plate v which is fixed to the distal end of the second output shaft g2 is shall be sandwiched between the fixed plate portion w and the movable plate t. Further electromagnetic stator y that is magnetized by the excitation of the exciting coils x provided on the outer peripheral side of the power spring u is Ru is fixed to the inner peripheral side of the power spring u. Thus, the electromagnetic brake S is configured.
[0006]
When energization of at the door locking device of FIG. 5 to the exciting coil x as in Fig (A) is Ru is blocked, press the variable rotation plate t and rotational friction plate v is to the right by the elastic force of the power spring u It is moved and pressed against the fixed plate portion w. Even if this tends to rotate the rotating friction plate v of the second output shaft g2 by driving the motor a, prevents rotation of the motor a is in frictional force generated between the rotating friction plate v and the fixed plate portion w Is done. Incidentally frictional force during this (static torque 3 approximately 5 kgf · cm) is made restraining force is increased in reduction ratio multiple of the deceleration mechanism b (about 1/10) and (static torque 30~50kgf · cm) Acts on the door f. Then as in FIG. 5 (B), the the excitation coils x of the electromagnetic brake S is passing Den励 magnetic, movable plate t by a magnetic force of the exciting electromagnetic stator y is against the elastic force of the power spring u adsorption to change position. As a result , as shown in FIG. 5B, the rotating friction plate v is free to rotate with respect to the fixed plate portion w, and the second output shaft g of the motor a is released from the restrained state and can rotate. because door f will be able to open and close.
[0007]
In the case of the conventional example using the electromagnetic brake S as shown in FIG. 5, if the door f is pulled by the external force (50 kgf · cm or more) which is higher than the frictional force, the door is opened. This can not be satisfactory in terms of the reliability of crime prevention. Further disadvantage and that must be using a special motor, also labor on the assembly work, which must be incorporated into the electromagnetic brake S to the motor a and integrated, making it difficult to provide an inexpensive door locking device.
[0008]
[Problems to be solved by the invention]
In view of the above-mentioned problems of the prior art, the present invention provides a door locking device for an automatic opening / closing door, which can realize the adoption of a general-purpose motor, the reliability of the locking state, the simplification of assembly work, the reduction in size, and the reduction in cost. I will provide a.
[0009]
[Means for Solving the Problems]
A door locking device for an automatic opening / closing door according to claim 1 of the present invention is characterized by the following means for solving the problem in order to achieve an intended purpose. That is, in the door locking device of the first aspect, the automatic opening / closing door has a horizontal base on an upper side thereof, and a space for disposing a pulley or a belt is interposed between the automatic locking door and the horizontal base. Is mounted on the horizontal base, and the reduction unit having the reduction unit input shaft and the reduction unit output shaft is provided on the front side of the mounting plate body, and the front end of the reduction unit output shaft is on the front side of the mounting plate body. The rear end of the input shaft that protrudes and that of the reduction unit input shaft penetrates the mounting plate and protrudes to the back side of the mounting plate, and decelerates to the rear end of the reduction unit input shaft that is behind the mounting plate. The output pulley is attached to the front end of the output shaft on the front side of the mounting plate, and the output pulley is attached to the front end of the output shaft. Mounted on the front side of the mounting plate And the motor output shaft penetrates through the mounting plate, and the penetrated end protrudes from the back side of the mounting plate. The pulley is attached, and the reduction gear toothed belt is wound around the motor toothed pulley and the reduction gear input toothed pulley on the back side of the mounting plate, and on the front side of the mounting plate. The output portion toothed belt is stretched around the reduction gear output toothed driven pulley and the corresponding toothed driven pulley, and the door is attached to the output portion toothed belt, and the motor is provided. The rotation of the toothed pulley is transmitted to the reduction unit input toothed pulley via the reduction unit toothed belt, and the rotation of the reduction unit output toothed driven pulley is transmitted to the toothed driven pulley via the output unit toothed belt. The automatic opening and closing door on the premise that the door is opened and closed, it is provided with an electromagnetic solenoid having a plunger, and the restraining rod is connected to the plunger, and the electromagnetic solenoid is It is arranged near the motor toothed pulley and is attached to the back side of the mounting plate body, and the distal end of the restraining rod and the interdental recess of the motor toothed pulley correspond to each other so as to be freely latchable, and In relation to the relative relationship between the motor toothed pulley and the restraining rod, when the electromagnetic solenoid is energized or de-energized, the restraining rod is actuated together with the plunger toward the motor toothed pulley and locked in the interdental recess of the motor toothed pulley. When the electromagnetic solenoid is de-energized or energized, the restraining rod returns together with the plunger and the inter-tooth recess of the motor toothed pulley Characterized in that it is separated from the
[0010]
A door locking device for an automatic opening / closing door according to a second aspect of the present invention is characterized by the following means for achieving the intended object. That is, in the door locking device of the second aspect, the automatic opening / closing door is provided with a horizontal base on an upper side thereof, and a space for disposing a pulley or a belt is interposed between the automatic locking door and the horizontal base. Is mounted on the horizontal base, and the reduction unit having the reduction unit input shaft and the reduction unit output shaft is provided on the front side of the mounting plate body, and the front end of the reduction unit output shaft is on the front side of the mounting plate body. The rear end of the input shaft that protrudes and that of the reduction unit input shaft penetrates the mounting plate and protrudes to the back side of the mounting plate, and decelerates to the rear end of the reduction unit input shaft that is behind the mounting plate. The output pulley is attached to the front end of the output shaft on the front side of the mounting plate, and the output pulley is attached to the front end of the output shaft. Mounted on the front side of the mounting plate And the motor output shaft penetrates through the mounting plate, and the penetrated end protrudes from the back side of the mounting plate. The pulley is attached, and the reduction gear toothed belt is wound around the motor toothed pulley and the reduction gear input toothed pulley on the back side of the mounting plate, and on the front side of the mounting plate. The output portion toothed belt is stretched around the reduction gear output toothed driven pulley and the corresponding toothed driven pulley, and the door is attached to the output portion toothed belt, and the motor is provided. The rotation of the toothed pulley is transmitted to the reduction unit input toothed pulley via the reduction unit toothed belt, and the rotation of the reduction unit output toothed driven pulley is transmitted to the toothed driven pulley via the output unit toothed belt. The automatic opening and closing door on the premise that the door is opened and closed, it is provided with an electromagnetic solenoid having a plunger, and the restraining rod is connected to the plunger, and the electromagnetic solenoid is It is arranged near the reduction unit input toothed pulley and attached to the back side of the mounting plate body, and the tip of the restraining rod and the interdental recess of the reduction unit input toothed pulley correspond to each other in a freely latchable manner. In the relative relationship between the motor toothed pulley and the restraining rod, when the electromagnetic solenoid is energized or de-energized, the restraining rod is operated together with the plunger toward the deceleration part input toothed pulley, and The locking rod is locked with the interdental recess, and when the electromagnetic solenoid is de-energized or energized, the restraining rod returns with the plunger and the deceleration part is input. The toothed pulley is detached from the interdental recess .
[0011]
[Action]
In the door locking device according to the first aspect of the present invention, the electromagnetic solenoid is turned on or off when locking or unlocking the door. As an example, when the plunger operates to the motor toothed pulley side by energizing the electromagnetic solenoid, the tip of the restraining rod connected to the plunger enters the interdental recess of the motor toothed pulley and locks it. State. This locked state is the door locked state. When the device is locked, the rotation of the motor toothed pulley is blocked by the restraining rod, thereby restricting the movement of the entire transmission system, so that the door does not move even if a force in the door opening and closing direction is applied . Conversely, when the plunger returns due to the non-energization of the electromagnetic solenoid, the tip of the restraining rod connected to the plunger is disengaged from the interdental recess of the motor toothed pulley and the locking ( locking) is released. You. In this case, a series of transmission systems using a motor as a power source can be operated, so that the door can be automatically opened and closed.
[0012]
The door locking device according to the second aspect of the present invention also turns on or off the electromagnetic solenoid when locking or unlocking the door. As an example, when the plunger is actuated to the deceleration portion input toothed pulley side by energizing the electromagnetic solenoid, the tip of the restraining rod connected to the plunger enters the interdental recess of the deceleration portion input toothed pulley. This is the locked state. This locked state is the door locked state. When the device is in a locked state, the rotation of the reduction unit input toothed pulley is blocked by the restraining rod, thereby restricting the movement of the entire power transmission system, so that the door does not move even if a force in the door opening and closing direction is applied . Conversely, when the plunger returns due to the non-energization of the electromagnetic solenoid, the tip of the restraining rod connected to the plunger is disengaged from the interdental recess of the pulley with input teeth of the reduction unit, and the locking ( locking) is performed. It is released. In this case, a series of transmission systems using a motor as a power source can be operated, so that the door can be automatically opened and closed.
[0013]
Incidentally, the force for preventing the rotation of the motor toothed pulley through the restraining rod may be reduced by the speed reduction ratio times the speed reduction unit, so that the force acting on the door side (the reduction gear output toothed driving pulley side) is reduced. The ratio may be doubled. On the other hand, the force for preventing the rotation of the reduction portion input toothed pulley via the restraining rod is different from that described above by the reduction ratio of the motor toothed pulley: the reduction portion input toothed pulley.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
For door locking device in the automatic door of the present invention will be explained based on this embodiment in the accompanying drawings, similar to the previous Symbol conventional example is also a door locking device at that time, to attached to the known automatic door Things.
[0015]
Automatic door A which is illustrated in FIGS. 1 and 2, for the horizontal direction based B of the heights is constructed by attaching a drive mechanism C as follows. A general-purpose motor 1 is used as a power source of the drive mechanism C, and a pulley 1 b with a motor tooth is attached to an output shaft 1 a of the motor 1. The reduction section 2 is provided adjacent to the motor 1. The reduction unit input toothed pulley 2a of the reduction unit 2 is attached to the reduction unit input shaft 2c, and the reduction unit output toothed driven pulley 2b of the reduction unit 2 is attached to the reduction unit output shaft 2f. In this case, the reduction portion toothed belt 3 is stretched around the motor toothed pulley 1b and the reduction portion input toothed pulley 2a. Accordingly, the rotation of the motor toothed pulley 1b is transmitted to the reduction portion input toothed pulley 2a via the reduction portion toothed belt 3 . On the other hand, the toothed driven pulley 4 is arranged so as to correspond to the reduction portion output toothed main pulley 2b, and the output portion toothed belt 5 extends between the reduction portion output toothed main pulley 2b and the toothed driven pulley 4. It is hung around. More specifically, a door 6 is attached to the output portion toothed belt 5 via a connector 5a. Thus the rotation of the deceleration section output toothed driving pulley 2b is transmitted to the toothed driven pulley 4 via the output unit toothed belt 5. The door 6 is opened and closed by guiding the running rail or the like ( not shown) by the operation of the output portion toothed belt 5 in this manner .
[0016]
For the reduction unit 2 illustrated in Figure 2, the first intermediate gear 2d is or attached to the reduction gear unit input shaft 2c, the second intermediate gear 2e meshing with the first intermediate gear 2d is attached to the speed reduction unit output shaft 2f It has been shown that it has a deceleration function. In this case, the body 2g of the reduction unit 2 supports the reduction unit input shaft 2c and the reduction unit output shaft 2f via the input side bearing 2h and the output side bearing 2i .
[0017]
In one embodiment of the present invention, an electromagnetic solenoid 7 in the vicinity place of the motor toothed pulley 1b at the automatic door A as described above it is installed. The electromagnetic solenoid 7 includes a plunger 7a and a constraining rod 7b. As can be understood from FIG. 1B, the distal end of the restraining rod 7 and the interdental recess 7d of the motor toothed pulley 1b correspond to each other so as to be freely locked. In this case, when the electromagnetic solenoid 7 is energized or de-energized , the plunger 7a and the restraining rod 7b operate or return to the motor toothed pulley 1b. For example , when the restraining rod 7b enters the interdental recess 7d by energizing the electromagnetic solenoid 7, both are locked. In addition, in this locked state, the spring 7e is in a compressed state. Even Ru Kotogaa such that collision with the tooth portion 7c not restraining rod 7b is antidiarrheal engages the interdental recess 7d in such a locking operation, tooth restraining rod 7b is when actually is opened and closed the door 6 manually Susumu entrance to Rukara never lock is Ru disturbed during recess 7d. In the non-energization of the electromagnetic solenoid 7, the restoring force of a spring 7e in a compressed state acts on the plunger 7a and restraining rod 7b, the above lock is released so constrained rod 7b is disengaged from the teeth between the recesses 7d.
[0018]
The following can be said when using the door locking device according to the above embodiment of the present invention . It is possible to achieve the purpose of locking with the use of general-purpose motor. Since advantage of the motor toothed pulley 1b suffice attached electromagnetic solenoid 7. Since the rotation of the motor toothed pulley 1b is prevented by the restraining rod 7b, the opening and closing movement force acting on the door 6 can be prevented with a stopping force that is twice the reduction ratio. As for the electromagnetic solenoid 7, it is not necessary to use one having such a large mechanical strength.
[0019]
For another embodiment of the present invention, the basic configuration of this to be the same as the above embodiment. The difference between this embodiment and the above-described embodiment (not shown) is that the restraining rod 7b of the electromagnetic solenoid 7 is provided in the interdental recess 2k formed between the teeth 2j of the pulley 2a with the reduction gear input. it is to be engaging. Thus such embodiments operational effects are essentially identical to those described above, when the ratio solid to those relative locking and restraining rod 7b and the motor toothed pulley 1b, blocking force against the opening and closing of the door 6 but but you decrease somewhat, it can be subjected practical use is enough.
[0020]
Other items relating to each embodiment of the present invention are as follows with reference to FIGS. Motor 1 and the speed reduction unit 2 is installed in a separately prepared by mounting plate body 8 means integrally formed Toka Toka screwed to the front side 8a (not shown) adjacent to each other. In this case, the front end of the reduction unit output shaft 2f projects to the front side of the mounting plate 8, the rear end of the reduction unit input shaft 2c penetrates the mounting plate 8 and projects to the back side 8b of the mounting plate 8, The first output shaft 1a also penetrates through the mounting plate 8, and its penetrating end protrudes to the rear side of the mounting plate 8. A reduction unit input toothed pulley 2a is attached to the rear end of the reduction unit input shaft 2c on the rear side of the mounting plate 8, and a reduction unit is mounted on the front end of the reduction unit output shaft 2f on the front side of the mounting plate 8. An output toothed driving pulley 2b is attached, and a motor toothed pulley 1b is attached to an end of the output shaft 1a protruding from the rear side of the mounting plate 8. The reduction portion toothed belt 3 is stretched around the motor toothed pulley 1b and the reduction portion input toothed pulley 2a on the back side of the mounting plate 8, and the output portion toothed belt 5 outputs the reduction portion output on the front side of the mounting plate 8. It is wound around the toothed driven pulley 2b and the corresponding toothed driven pulley 4. In this case, the motor toothed pulley 1b and the speed reduction portion input toothed pulley 2a are exposed on the back side 8b of the mounting plate 8, as shown in FIG. So electromagnetic solenoid 7, after being positioned as in FIG. 1 (B), is fixed by bis 8c on the back side 8b of the mounting plate member 8.
[0021]
Positioning the upper SL is when the electromagnetic solenoid 7 to the excitation or non-excitation state in FIG. 1 (B), the interdental recesses interdental recesses 7d or decelerating unit input toothed driving pulley 2b of the motor toothed pulley 1b This is performed so that the 2k and the constraint rod 7b can be locked . Since such positioning operation is carried out in advance in the production process of the product, when installing the automatic door A in sideways base B of the entrance designated by the customer, this kind of adjustment is not necessary. Therefore Bayoku is to secure the mounting plate member 8 at a predetermined position secured with screws, as shown in FIG. 1 (A), personnel working position adjustment of the electromagnetic solenoid 7 will not be performed when by this.
[0022]
【The invention's effect】
The door locking device in the automatic opening / closing door according to the present invention has the following effects.
(1) Since the rotation of the motor toothed pulley attached to the output shaft of the motor has a configuration that can be blocked by operation of the electromagnetic solenoid, it is possible to adopt a general-purpose motor instead of a special motor. Therefore, the manufacturing process can be simplified and an inexpensive product can be provided.
(2) There is no need for labor, unlike the conventional example , in which separately prepared constrained sprockets and guide blocks are attached at the time of installing the automatic door.
(3) because those using motor toothed pulley and deceleration unit input toothed pulley and deceleration unit output toothed driving pulley, a driven pulley and deceleration portions toothed belt output unit toothed belt toothed slip between these members Does not occur . Therefore, even if an external force acts , unintended door opening and closing due to slip does not occur , and the locking device is highly reliable .
(4) The configuration in which the rotation of the pulley with toothed teeth of the reduction unit can be prevented by the operation of the electromagnetic solenoid can also exhibit the same operation and effect as described above .
(5) Since the electromagnetic solenoid is mounted on the back side of the mounting plate on which the motor and the reduction unit are mounted , the electromagnetic solenoid can be mounted in a predetermined position on the mounting plate in advance. Thus automatic door of the positioning of the hand electromagnetic solenoid needs rather Na performed upon installation, is reduced effort hence aerial, it can be performed quick work.
[Brief description of the drawings]
FIG. 1 is a front view schematically showing an automatic opening / closing door having a door locking device of the present invention, and an enlarged rear view of a main part.
FIG. 2 is an enlarged plan view showing a main part of the door locking device of the present invention with a part thereof cut away .
FIG. 3 is an overall front view schematically showing a conventional automatic opening / closing door together with a door locking device .
FIG. 4 is an enlarged plan view schematically showing a main part of the apparatus shown in FIG.
5 is a plan view of the flat plane view of another conventional door locking device main parts partially cutaway door locking state shown substantially its canceled state.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 motor 1a output shaft 1b motor toothed pulley 2 reduction gear 2a reduction gear input toothed pulley 2b reduction gear output toothed main pulley 2k interdental recess 3 reduction gear toothed belt 4 toothed driven pulley 5 output gear toothed belt 6 Door 7 Electromagnetic solenoid 7a Plunger 7b Restraining rod 7d Interdental recess 8 Mounting plate 8a Front side 8b Back side A Automatic door

Claims (2)

The automatic opening / closing door has a horizontal base on its upper side, and the mounting plate is attached to the horizontal base with a space for arranging pulleys and belts interposed between the automatic base and the horizontal base, In addition, a reduction unit having a reduction unit input shaft and a reduction unit output shaft is provided on the front side of the mounting plate body, and the front end of the reduction unit output shaft projects to the front side of the mounting plate unit and is located behind the reduction unit input shaft. The end portion penetrates through the mounting plate and protrudes to the back side of the mounting plate, and a speed reducing portion input toothed pulley is attached to the rear end of the speed reducing portion input shaft on the back side of the mounting plate. A drive pulley with a reduction unit output tooth is attached to the front end of the reduction unit output shaft on the front side of the mounting plate, and a motor is mounted on the front side of the mounting plate adjacent to the reduction unit. The motor output shaft is also a mounting plate That the penetrated end thereof protrudes to the back side of the mounting plate body, and that the motor toothed pulley is attached to the end of the motor output shaft protruding to the back side of the mounting plate body, and The reduction gear toothed belt is stretched around the motor toothed pulley and the reduction gear input gear pulley on the back side of the mounting plate, and the reduction gear output toothed main pulley and the The output portion toothed belt is wound around the corresponding toothed driven pulley, the door is attached to the output portion toothed belt, and the rotation of the motor toothed pulley is reduced by the reduction portion toothed. The door is opened / closed by being transmitted to the reduction unit input toothed pulley via a belt or the rotation of the reduction unit output toothed driven pulley is transmitted to the toothed driven pulley via the output unit toothed belt. It is assumed that the automatic opening and closing door is provided with an electromagnetic solenoid having a plunger, and that a constraining rod is connected to the plunger, and that the electromagnetic solenoid is mounted near the motor toothed pulley. It is attached to the back side of the plate, and the tip of the restraining rod and the interdental recess of the motor toothed pulley correspond to each other so as to be freely latchable. In relation to this, when the electromagnetic solenoid is energized or de-energized, the restraining rod moves to the motor toothed pulley side together with the plunger and locks in the inter-tooth recess of the motor toothed pulley, and the electromagnetic solenoid is de-energized or de-energized. It is characterized in that the restraining rod returns with the plunger when energized and separates from the interdental recess of the motor toothed pulley. Door locking device for automatic opening and closing doors. The automatic opening / closing door has a horizontal base on its upper side, and the mounting plate is attached to the horizontal base with a space for arranging pulleys and belts interposed between the automatic base and the horizontal base, In addition, a reduction unit having a reduction unit input shaft and a reduction unit output shaft is provided on the front side of the mounting plate body, and the front end of the reduction unit output shaft projects to the front side of the mounting plate unit and is located behind the reduction unit input shaft. The end portion penetrates through the mounting plate and protrudes to the back side of the mounting plate, and a speed reducing portion input toothed pulley is attached to the rear end of the speed reducing portion input shaft on the back side of the mounting plate. A drive pulley with a reduction unit output tooth is attached to the front end of the reduction unit output shaft on the front side of the mounting plate, and a motor is mounted on the front side of the mounting plate adjacent to the reduction unit. The motor output shaft is also a mounting plate That the penetrated end thereof protrudes to the back side of the mounting plate body, and that the motor toothed pulley is attached to the end of the motor output shaft protruding to the back side of the mounting plate body, and The reduction gear toothed belt is stretched around the motor toothed pulley and the reduction gear input gear pulley on the back side of the mounting plate, and the reduction gear output toothed main pulley and the The output portion toothed belt is wound around the corresponding toothed driven pulley, the door is attached to the output portion toothed belt, and the rotation of the motor toothed pulley is reduced by the reduction portion toothed. The door is opened / closed by being transmitted to the reduction unit input toothed pulley via a belt or the rotation of the reduction unit output toothed driven pulley is transmitted to the toothed driven pulley via the output unit toothed belt. In the automatic opening / closing door on the premise that an electromagnetic solenoid having a plunger is provided and a restraining rod is connected to the plunger, and the electromagnetic solenoid is arranged near the pulley with a reduction unit input tooth. that the interdental recesses of the reduction unit input toothed pulley and the distal end portion of the restraining rod with attached to the back side of the mounting plate member corresponds freely relative locking Te, and the motor toothed pulley In the relative relationship between the solenoid and the restraining rod, the restraining rod is actuated together with the plunger to the deceleration part input toothed pulley side to lock the interdental recess of the deceleration part input toothed pulley by energizing or deenergizing the electromagnetic solenoid. In addition, when the electromagnetic solenoid is de-energized or energized, the restraining rod returns with the plunger and separates from the interdental recess of the pulley with toothed reduction unit input. A door locking device for an automatic opening / closing door.

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