JP2002138753A - Sliding door device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sliding door device capable of holding a door body in a fully open position when necessary, while using a simple arrangement as a means for opening a sliding door by means of a switch and for closing the door by means of an automatic closure device, and capable also of achieving smooth opening and closing movements. SOLUTION: A sliding door holding means for restricting the movement of the door body 2a is actuated as long as both a full-open signal from a proximity switch 6 and a detection signal from a photoelectric switch 9 are both input to the control portion 8 of the sliding door device 1 which uses the switch 3 to drive the door for opening and uses the automatic closure device 4 to drive the door for closing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sliding door device attached to an opening of a building, and more particularly to a sliding door which is opened and closed by a switch and closed by using a spring or a dead weight of a door body. The present invention relates to a sliding door device performed by a mechanism.

[0002]

2. Description of the Related Art Conventionally, when a sliding door device is used as a fire door, it must be closed even in the event of a power failure. Therefore, an electric sliding door that opens and closes the sliding door with a switch cannot be used. Closed sliding door devices were employed. However, sliding doors installed on the indoor side are often used in hospitals and nursing homes, and in such places electric-powered sliding doors are required, so when using electric sliding doors in such places, Even in the event of a power outage, a separate battery for closing the sliding door had to be provided, resulting in a significant increase in cost.

Therefore, it is conceivable to adopt a normally-closed type sliding door in which the opening operation of the sliding door is performed by an electric drive mechanism using a switch, and the closing operation is performed by a self-closing mechanism using a spring or the weight of the door body. However, since such a sliding door device cannot hold the door body at the fully open position, if the photoelectric sensor for starting or pinching is kept blocked, the door body repeatedly opens and closes near the fully open position. Had a problem that it would occur. This is because when the door is closed and the proximity switch returns from the fully open state and the proximity switch returns, the door is opened by being activated, and the proximity switch works as soon as the door is opened and the door stops and This operation is repeated while the photoelectric sensor is closed by the self-closing mechanism.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and means for opening a door with a switch and closing the door with a self-closing mechanism has a simple structure. It is an object of the present invention to provide a sliding door device capable of holding a door body at a fully open position when necessary even though the sliding door is a normally closed sliding door. Another object is to provide a sliding door device capable of realizing a good opening / closing operation.

[0005]

The technical means adopted by the present invention to achieve the above object is a switch for opening the sliding door, a self-closing mechanism for closing the sliding door, and a fully open position of the sliding door. In a sliding door device including a proximity switch for detecting a position, a photoelectric sensor provided between the openings, and a control unit for controlling opening and closing of the sliding door, the control unit includes a fully open signal from the proximity switch and a detection signal from the photoelectric sensor. During the operation, the sliding door holding means for controlling the movement of the sliding door is operated. By doing so, when the normally closed sliding door is at the fully open position, the sliding door does not repeatedly open and close near the fully open position even when the photoelectric sensor is blocked, and is held at the fully open position. Will be. The sliding door holding means may use, for example, a brake device or an electromagnet of a switch, and when the sliding door is in the fully open position and blocks the photoelectric sensor, the sliding door is operated to regulate the movement of the sliding door. I do. The sliding door holding means is not limited to these.

The present invention further provides a switchgear for opening a sliding door, a self-closing mechanism for closing the sliding door, a proximity switch for detecting a fully opened position of the sliding door, and a control unit for controlling opening and closing of the sliding door. In the sliding door device configured, when the control unit receives a fully open signal from the proximity switch, the control unit activates a sliding door holding unit that regulates movement of the sliding door for a predetermined time. In this way, even if the sliding door is opened and reaches the fully opened position, it is not immediately closed, and the sliding door can be held at the fully opened position for a preset time, so that the user is not feared. In addition, a movement substantially equivalent to that of the electric sliding door can be realized. The sliding door holding means may use, for example, a brake device of an opening / closing device or an electromagnet. When a fully opened signal of the proximity switch is received, the sliding door holding means is operated for a predetermined time to restrict the movement of the sliding door. The sliding door holding means is not limited to these.

Further, the present invention is characterized in that, in the above-described apparatus, the sliding door holding means applies a DC voltage to the switch to restrict the movement of the sliding door. By doing so, even when the sliding door is at the fully open position and the photoelectric sensor is blocked, the sliding door does not repeatedly open and close near the fully open position. This is because when a DC voltage is applied to the AC switch, a magnetic field is generated in the winding of the switch, and the rotating shaft of the switch is locked (DC braking). Brake devices and electromagnets themselves are expensive. It is necessary to secure a storage space for mounting the device. The operation noise of the device was large and there was a problem that it was difficult to use in hospitals, etc.However, in order to implement the present invention, it is economical and only little change in the circuit and program from the conventional one, and almost no operation noise is generated Therefore, it is suitable. Further, at the time of a power failure, the DC voltage applied to the switch is cut off and the rotation shaft of the switch is unlocked, so that the self-closing mechanism closes the sliding door.

[0008]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a front view of a sliding door device according to the present invention. A sliding door device 1 according to the present invention is installed at an opening connecting the indoor and the outdoor of the building.
The basic part is composed of a door body 2a, hanger rollers 2b and 2b provided above the door body 2a, and a long hanger rail 2c extending in the left-right direction above the opening. By sliding with respect to the hanger rail 2c via the hanger rollers 2b, 2b, it is movable in the left-right direction. Reference numeral 3 denotes a switch for opening and closing the door 2a.
Reference numeral 4 denotes a sliding door closer for closing and driving the door body 2a, and each pulley 3a, 4a of the opening and closing device 3 and the sliding door closer 4.
a of the door body 2 by the drive belt 5 wound around the
The driving force of the opening and closing device 3 and the urging force of the sliding door closer 4 are transmitted to a, and the opening and closing operation of the door body 2a is performed. As shown in FIG. 8, a one-way clutch 3c is provided between the pulley 3a and the rotating shaft 3b of the switch 3, and the switch 3 has an increased startup torque by means such as not providing an oil seal. It is set low. Further, the sliding door closer 4 always biases the door body 2a in the closing direction. When the sliding door 2a is fully opened, the sliding door closer 4 overcomes the speed-up starting torque of the opening / closing device 3 and the sliding door closer 4 biases the sliding door door 2a to bias the door body 2a. It is designed to automatically close.

Reference numeral 6 denotes a proximity switch, which detects a full opening of the door 2a when a magnet 7 attached to the hanger roller 2b approaches and sends a full opening signal to a control unit 8 for controlling opening and closing of the sliding door device 1. The drive of the switchgear 3 is stopped. Further, the proximity switch 6 is configured to detect a position slightly before the fully opened position of the door 2a, and is set so that the door 2a is brought to the fully opened position by inertia after the switch 3 is stopped. The proximity switch 6 is a self-holding switch, and is configured to keep outputting a fully open signal to the control unit 8 when the door body 2a is between the detection position and the fully open position.

Reference numeral 9 denotes a photoelectric sensor provided between the openings of the sliding door device 1. When the photoelectric sensor 9 detects a person or an object when the door body 2a is closed or when the door body 2a is fully closed, the photoelectric sensor 9 sends a detection signal to the control unit 8 to open and close. The device 3 is driven to open the door 2a. Reference numeral 10 denotes a touch panel provided on the door body 2a.
Is activated to perform the opening operation of the door body 2a (actually, by bringing the hand close to the touch panel 10, the photoelectric sensor 9 detects the opening operation of the door body 2a). In the present embodiment, the touch panel 10 (photoelectric sensor 9) is used as a start-up switch. However, a separate open push-button switch may be provided. Then, by touching the touch panel 10, the control unit 8 causes the photoelectric sensor 9
Is sent, the control unit 8 drives the switchgear 3 to open, and the door 2a starts the opening operation. Thereafter, upon receiving a fully open signal from the proximity switch 6, the control unit 8 sets the switch 3
Is stopped, and the door body 2a reaches the fully open position by inertia. On the other hand, the closing of the door 2a is performed only by the urging force of the sliding door closer 4.

FIG. 2 shows a control circuit 11 provided in the control unit 8 of the sliding door device 1 according to the present invention.
A voltage of 100 V is applied. The control circuit 11 controls an AC circuit 12 that supplies an AC voltage to the switch 3 (AC switch in this embodiment), a DC circuit 13 that applies a DC voltage to the switch 3, and an opening / closing operation of the sliding door device. It is composed of a program circuit 14 having a program section 15 to control. The AC circuit 12 has an R1 relay contact 12a,
When the R1 relay contact 12a is closed, an AC voltage is supplied to the switch 3, and the rotating shaft 3b of the switch 3 rotates. The rotation direction of the rotation shaft 3b is the same as the door body 2a.
In the direction of opening operation. The DC circuit 13 includes an R2 relay contact 13a that switches when the sliding door holding unit of the present invention is operated, an R1 relay contact 13b that is a b contact, and a rectifier 13c that converts an AC voltage to a DC voltage.
The R1 relay contact 13b is connected between the AC circuit 12 and the DC circuit 1.
3 serves as an interlock to prevent the closed state at the same time. Then, when the R2 relay contact 13a is closed, the DC voltage converted from the AC voltage by the rectifier 13c is applied to the switch 3. When this state is reached, switchgear 3
Is locked (DC braking), so that the door 2
The movement of “a” is regulated. Program circuit 14
Is 100 V AC by the transformer 14a and the rectifier 14b.
Is converted to DC10V, and DC10V is applied to the program unit 15. A different sequence circuit is incorporated in the program unit 15 for each embodiment described later. In each sequence circuit, the R1 relay contacts 12a and 13b of the AC circuit 12 and the DC circuit 13 and the R2 relay contact 13a are provided. A coil for switching a contact is provided. Then, when a voltage is applied to each coil by the movement of the sliding door device, a corresponding relay contact is switched.

Next, the operation of the sliding door device 1 according to the first embodiment of the present invention will be described. FIG. 3A is a sequence circuit 16 in the first embodiment, and FIG. 5 is a flowchart for explaining the operation of the first embodiment. In FIG. 3A,
Reference numeral 16a denotes a start switch which is switched by touching the touch panel 10 with a hand. Specifically, as described above, the contact a which is switched by being detected (blocked) by the photoelectric sensor 9 provided between the openings of the sliding door device 1 is described. Switch. 16b is a proximity switch contact (b contact) that switches based on a full open signal of the proximity switch 6, 16
c is an R1 relay coil, and R1 relay coil 16c
When a current flows through the relay, the corresponding relay contact is activated. 16d is an R1 relay contact (a contact) corresponding to the R1 relay coil 16c, 16e is a proximity switch contact (a contact) switched based on a fully open signal of the proximity switch 6, 16f is a photoelectric sensor switched by detection by the photoelectric sensor 9. Contact (a contact), 16g is R
It is a 2-relay coil, and when a current flows like the R1 relay coil 16c, the relay contact corresponding thereto is switched.

In the flowchart of FIG. 5, first, S1
Is started from the start state. The start state refers to a state in which the power is supplied to the sliding door device 1 and the door body 2a is fully closed. Next, in S2, when the user touches the touch panel 10 with his or her hand, the photoelectric sensor 9 is blocked, and the start switch 16a is switched. And start switch 1
When 6a is switched, a current flows through the R1 relay coil 16c. In this state, the R1 relay contacts 12a of the AC circuit 12 are switched, and the AC circuit 12 is closed, so that the switch 3 is supplied with AC voltage. Further, the R1 relay contact 13b of the DC circuit 13 is also switched. Therefore, when the AC circuit 12 is in the closed state, the DC circuit 13 is always in the open state (interlock function). When an AC voltage is supplied to the switch 3, S
Then, the door body 2a starts the opening operation by the driving force of the switch 3. Also, the R1 relay contact 1 of the sequence circuit 16
Since the switch 6d is also switched, the supply of current to the R1 relay coil 16c is continued only by interrupting the photoelectric sensor 9 once (self-holding function). Subsequently, the process proceeds to S4, where it is determined whether or not the fully open signal from the proximity switch 6 has been sent. If the full-open signal of the proximity switch 6 has not been input here, the process returns to S3, and the door 2a has not yet reached the fully-open position.
The opening operation of a is continued. On the other hand, when the fully open signal is input from the proximity switch 6 in S4, the proximity switch contacts 16b and 16e of the sequence circuit 16 are switched and R
The current flowing through one relay coil 16c is cut off. R
When current stops flowing through one relay coil 16c, the switched R1 relay contacts 12a and 16d return to the original state. Then, the AC circuit 12 is in the open state, and the AC voltage is not supplied to the switch 3, so that the drive of the switch 3 is stopped. As described above, the proximity switch 6 detects the position before the fully opened position of the door 2a, and then the door 2a reaches the fully opened position by inertia.

In S5, it is determined whether the photoelectric sensor 9 has detected (blocked). Here, when the photoelectric sensor 9 does not detect, the process proceeds to S8, immediately after the door body 2a reaches the fully open position, the closing operation of the door body 2a is performed by the sliding door closer 4, and thereafter, the fully closed state of S9 is reached and the flowchart of FIG. The cycle ends. On the other hand, when the photoelectric sensor 9 detects in S5, the photoelectric sensor contact 16f of the sequence circuit 16 is switched, a current flows through the R2 relay coil 16g, the R2 relay contact 13a of the DC circuit 13 is switched, and the DC circuit is switched. 13 is closed, and DC voltage is supplied to the switchgear 3. In this state, the rotating shaft 3b of the switch 3 is locked by the effect of the electromagnet (direct current braking), and the movement of the door body 2a is restricted (operation of the sliding door holding means). A one-way clutch 3c is provided between the rotating shaft 3b of the switch 3 and the pulley 3a. The one-way clutch 3c engages with the ball 3d when the rotating shaft 3b rotates in the opening direction a of the door 2a. To move to the position S, the driving force of the switchgear 3 is transmitted by rotating integrally with the pulley 3a. In the state where the rotating shaft 3b is locked, when the pulley 3a tries to rotate in the opening direction A of the door body 2a, the one-way clutch 3c disengages the ball 3d from the engagement position S.
a and the rotating shaft 3b are in a free state, and the pulley 3a is rotatable. On the other hand, when the pulley 3a attempts to rotate in the closing direction B of the door body 2a, the ball 3d advances to the engagement position S, so that the ball 3d is locked and the pulley 3a cannot rotate. Therefore, the photoelectric sensor 9 detects immediately after or before the proximity switch 6 operates,
Even if the rotary shaft 3b of the switch 3 is locked immediately after the proximity switch 6 is actuated, the pulley 3a can rotate in the opening direction A of the door 2a, so that the door 2a stops suddenly. Therefore, there is no case where excessive force due to sudden braking acts on the sliding door device 1. When the sliding door closer 4 is fully opened, it receives the urging force of the sliding door closer 4, but the rotation of the pulley 3a in the closing direction B is locked, so that the door body 2a is held at the fully opened position. Generally, the proximity switch 6 is configured to detect when it comes to a position slightly before the fully closed position. However, since the one-way clutch 3c is provided, the proximity switch 6 moves to the fully open position by inertia, and moves to the fully opened position. Since the door 2a is stopped and held, the door 2a is not stopped and held at a position before the fully open position.

When the rotating shaft 3b of the switch 3 is locked in S6, the process proceeds to S7, and it is determined in S7 whether the detection signal from the photoelectric sensor 9 is continuing. Here, if the detection signal is continuing, the process returns to S6, the rotation shaft 3b of the switch 3 is kept locked, and the movement of the door 2a in the closing direction is continued to be restricted. On the other hand, if there is no input of the detection signal in S7, the photoelectric sensor contact 16f of the sequence circuit 16 switches, and the current flowing through the R2 relay coil 16g is interrupted. When the current stops flowing through the R2 relay coil 16g, the switched R2 relay contact 13a in the DC circuit 13 returns, and the DC circuit 13 is opened. The rotating shaft 3 of the switch 3 which is locked when the DC voltage supplied to the switch 3 is no longer supplied.
b becomes free. When the process proceeds from S7 to S8, the closing operation of the door body 2a is performed by the sliding door closer 4, and the process proceeds to S9.
, The door body 2a is fully closed and one cycle of the flowchart ends.

As described above, the sliding door apparatus 1 in the first embodiment is configured such that the sliding door closer 4 is closed while the signal from the photoelectric switch 9 is received when the door body 2a is fully opened.
The closing of the door body 2a is restricted by locking the rotation shaft 3b of the switchgear 3 (operating the sliding door holding means) by overcoming the urging force of the switch. For this reason, when the door body 2a is fully opened, the photoelectric sensor 9
Is continuously detected near the fully open position as in the related art, and a good sliding door opening / closing operation can be performed. In addition, at the time of a power failure, the DC voltage applied to the switch 3 is not supplied, so that the rotating shaft 3b
Is unlocked, and the door body 2a is closed by the urging force of the sliding door closer 4, so that the door body 2a is fully closed.

Next, the operation of the sliding door device 1 according to the second embodiment of the present invention will be described. FIG. 3B is a flowchart illustrating the operation of the sequence circuit 17 in the second embodiment, and FIG. 6 is a flowchart illustrating the operation of the second embodiment. In FIG. 3B,
17a to 17e are the same as 16a to 16e of the sequence circuit 16 of the first embodiment, respectively, and 17g is the same as 16g. 17f is a timer contact (b contact), 17
h denotes a timer coil, and the timer contact 17f is switched when the current continues to flow through the timer coil 17h for a preset time or longer. After the timer contact is switched once, the current flowing through the timer coil 17h is changed. It keeps the switched state until is cut off.

The operation of the second embodiment will be described with reference to the flowchart of FIG. First, start state of S1 (power ON
When the user touches the touch panel 10 from S2 to the door body 2a), the photoelectric sensor 9 is shut off, the start switch 17a is switched, and a current flows through the R1 relay coil 17c. And the R1 relay contact 1 of the AC circuit 12
2 a is switched, and the AC voltage is supplied to the switch 3. When the AC voltage is applied to the switch 3, the process proceeds to S3, and the door 2a starts the opening operation by driving the switch 3. Then, the process proceeds to S4, where it is determined whether a signal from the proximity switch 6 is input. If no signal is input here, the process returns to S3, and the opening operation is continued. On the other hand, when it is determined in S4 that the signal from the proximity switch 6 has been input, the proximity switch contacts 17b and 17e in the sequence circuit 17 are switched. When the proximity switch contact 17b is switched, the current flowing through the R1 relay coil 17c is not supplied, and the R1 relay contact 12a of the AC circuit 12 is restored, so that the supply of the AC voltage applied to the switch 3 is cut off. Then, the opening drive of the switchgear 3 is stopped. When the proximity switch contact 17e is switched, the timer coil 17h is switched.
Current flows through the timer, and at S5, the timer operates, and current also flows through the R2 relay coil 17g.
The two relay contacts 13a are switched to supply DC voltage to the switch 3, and in S6, the rotating shaft 3b of the switch 3
Is locked (the sliding door holding means is activated).

When the rotating shaft 3b of the switch 3 is locked in S6, the door 2a reaches the fully closed position by inertia and is stopped and held by the action of the one-way clutch 3c. Thereafter, the process proceeds to S7, where it is determined whether the timer operated in S5 has expired. Here, if it is determined that the time has not elapsed, the process returns to S6, the lock of the rotating shaft 3b of the switch 3 is continued, and the door body 2a is kept at the fully open position. On the other hand, if it is determined in S7 that the time is up, the timer contact 17 of the sequence circuit 17
f is switched, the current flowing through the R2 relay coil 17g is cut off, and the R2 relay contact 13a of the DC circuit 13 is turned off.
Returns. Then, the DC circuit 13 is opened and the supply of the DC voltage applied to the switch 3 is stopped,
The lock of the rotating shaft 3b is released. Incidentally, the set time of the timer is preferably about 5 seconds to 10 seconds. Preferably, the set time is adjustable.

When the lock of the rotating shaft 3b of the switchgear 3 is released in S7, the process proceeds to S8, and the door body 2a starts closing operation by the urging force of the sliding door closer 4. And door body 2a in S9
, And one cycle of the flowchart ends. As described above, in the second embodiment of the sliding door device 1 of the present invention, when the door body 2a is opened, the rotation shaft 3b of the switch 3 is locked (the sliding door holding means is activated) when the proximity switch 6 is turned on. The door body 2a is stopped and held at the fully open position. Further, when the proximity switch 6 is turned on, a timer is activated, and when a set time has elapsed, the lock of the rotating shaft 3b is released, and the sliding door closer 4 closes the door body 2a. Therefore, when the door body 2a is opened, it is stopped and held at the fully open position for a preset time, and then closed. Therefore, since the door body 2a does not close immediately when the door body 2a is opened as in the conventional normally-closing sliding door, it does not give a feeling of being likely to be caught by the user himself. Can be realized.

Next, the operation of the sliding door device according to the third embodiment of the present invention will be described. FIG. 4 is a flowchart illustrating the operation of the sequence circuit 18 in the third embodiment, and FIG. 7 is a flowchart illustrating the operation of the third embodiment. In FIG. 4, 18a to 18h
Are respectively 17a to 17a of the sequence circuit 17 of the second embodiment.
The description is omitted because it is the same as 17h. Reference numeral 18i denotes a photoelectric sensor contact (b contact), which is switched while the photoelectric sensor 9 is detecting.

The operation of the third embodiment will be described with reference to the flowchart of FIG. First, start state of S1 (power ON
When the user touches the touch panel 10 from S2 to the door body 2a), the photoelectric sensor 9 is blocked, the start switch 18a is switched, and a current flows through the R1 relay coil 18c. And the R1 relay contact 1 of the AC circuit 12
2 a is switched, and the AC voltage is supplied to the switch 3. When the AC voltage is applied to the switch 3, the process proceeds to S3, and the door 2a starts the opening operation by driving the switch 3. Then, the process proceeds to S4, where it is determined whether a signal from the proximity switch 6 is input. If no signal is input here, the process returns to S3, and the opening operation is continued. On the other hand, if it is determined in S4 that the signal from the proximity switch 6 has been input, the proximity switch contacts 18b and 18e in the sequence circuit 18 are switched. When the proximity switch contact 18b is switched, the current flowing in the R1 relay coil 18d is not supplied, and the R1 relay contact 12a of the AC circuit 12 is restored, and the supply of the AC voltage applied to the switch 3 is cut off. The opening drive of the switchgear 3 is stopped. Subsequently, the process proceeds to S5, where it is determined whether or not a detection signal from the photoelectric sensor 9 is input.
When the photoelectric sensor 9 detects, the photoelectric sensor contact 18i is switched, and the proximity switch contact 18e at S4 is switched.
The current flows only through the R2 relay coil 18g in accordance with the switching of the above, the rotation shaft 3b of the switch 3 is locked (the sliding door holding means is operated) in S6, and the door 2a is held at the fully open position. Further, in S7, it is determined whether or not the detection signal of the photoelectric sensor 9 is continuously input. If the detection signal is being continued, the process returns to S6 and the full opening of the door body 2a is maintained. If no detection signal is input in S7, the photoelectric sensor contact 18i returns and the timer coil 1
A current flows through 8h, and a timer operates in S8. In S9, the lock of the rotating shaft 3b of the switch 3 is continued, and it is determined in S10 whether the timer has expired. If the time is not up, the process returns to S9, and the lock of the rotating shaft 3b is maintained (the door body 2a is held at the fully open position), and if the time is up, the timer contact 18f is switched to R2.
Since the current flowing through the relay coil 18g stops,
The lock of the rotating shaft 3b of the switch 3 is released, and the process proceeds to S11, where the door body 2a starts the closing operation by the urging force of the sliding door closer 4. Then, the fully closed state of S12 is reached, and one cycle of the flowchart ends.

On the other hand, if there is no signal from the photoelectric sensor in S5, a current flows through the timer coil 18h and the timer operates in S8, and a current also flows through the R2 relay coil 18g. Rotary shaft 3 of switchgear 3
b is locked (the sliding door holding means is actuated), and the door body 2a is stopped and held at the fully opened position. Then S
At 10 it is determined whether the timer has timed out. If the time has not expired, the process returns to S9 and the lock of the rotating shaft 3b (the door body 2a is held at the fully open position) is continued. Is switched to R
2 Since the current flowing through the relay coil 18g is interrupted, the lock of the rotating shaft 3b of the switch 3 is released, and the process proceeds to S11, where the door body 2a starts closing operation by the urging force of the sliding door closer 4, and S12. Then, the door body 2a is fully closed and one cycle of the flowchart ends.

As described above, in the sliding door device 1 according to the third embodiment of the present invention, when the door 2a is normally opened and the proximity switch 6 is turned on, the rotating shaft 3b of the switch 3 is locked (normally). The sliding door holding means is actuated), and the door body 2a is stopped and held at the fully open position. Further, at the same time when the proximity switch 6 is turned on, a timer is operated. When a preset time elapses, the lock of the rotating shaft 3b is released, and the door body 2a is closed by the sliding door closer 4. Therefore, when the door body 2a is opened, it is stopped and held at the fully open position for a preset time, and then closed. Also door 2
While receiving the signal from the photoelectric switch 9 when a is in the fully opened state, the rotating shaft 3b of the opening and closing device 3 is locked by overcoming the urging force of the sliding door closer 4 (the sliding door holding means of the present invention). Since the closing of the door 2a is regulated by this, even if the photoelectric sensor 9 continues to be detected in the fully opened state of the door 2a, the opening and closing are not repeated near the fully opened position as in the related art. In addition, when the signal from the photoelectric sensor 9 disappears from this state, the timer is activated, and the lock of the rotating shaft 3b is released after a predetermined time has elapsed, so that the signal from the photoelectric sensor 9 disappears. Also, it is possible to realize a suitable sliding door opening / closing operation that is gentle to the user without immediately closing the door body 2a.

The present invention is a normally-closed sliding door device in which the door 2a is opened and closed by a switch 3 and the door is closed by a self-closing mechanism. Not only can be realized, but also the door body 2a of the sliding door can be opened and closed with a smaller amount of electric power than an electric sliding door device that performs opening and closing with a switch. In addition, since the closing of the sliding door is performed by a self-closing mechanism using the spring or the weight of the door body 2a, the sliding door can be closed even during a power failure and does not require a battery. Further, when the door 2a is closed, the door 2
Even if it touches the tip of a, since it is closed by the self-closing device, it does not receive a large impact force in opening and closing unlike the electric sliding door device performed by the switch.

The sliding door holding means of the present invention is configured such that by applying a DC voltage to the switch 3, the rotating shaft 3a of the switch 3 is locked (DC braking) and the door 2a is held at the fully open position. Therefore, there is no need to employ an electromagnet or a brake device for holding the sliding door. For this reason, the cost of the electromagnet and the brake device can be reduced, and
This is suitable because there is no need to separately secure a storage space for mounting these devices. In addition, electromagnets and brake devices generate loud operating noises and are not suitable for use in hospitals, etc., but the sliding door holding means of the present invention using DC braking produces almost no sound during operation, so the demand for sliding door devices is high. It can be used in hospitals, etc. where is expected.

In the embodiment of the present invention, the sliding door apparatus 1 is controlled by the above-described sequence control. However, it is needless to say that the present invention can be implemented by control of a microcomputer. The proximity switch 6 is used to detect the fully opened position of the door 2a (including the position slightly before the fully opened position). For example, a limit switch or a potentiometer may be used. What is necessary is just to be able to detect the fully open position.

[Brief description of the drawings]

FIG. 1 is a front view of a sliding door device.

FIG. 2 is a control circuit diagram

FIG. 3A shows a sequence circuit according to a first embodiment of the present invention. FIG. 3B shows a sequence circuit according to a second embodiment of the present invention.

FIG. 4 is a sequence circuit according to a third embodiment of the present invention;

FIG. 5 is a flowchart for explaining the operation of the sliding door device in the first embodiment of the present invention.

FIG. 6 is a flowchart illustrating the operation of the sliding door device according to the second embodiment of the present invention.

FIG. 7 is a flowchart illustrating the operation of the sliding door device according to the third embodiment of the present invention.

FIG. 8 is a diagram showing a relationship between a rotating shaft of a switch and a pulley.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sliding door apparatus 2a Door body 3 Switch 3b Rotating shaft 3c One-way clutch 6 Proximity switch 8 Control part 9 Photoelectric sensor 11 Control circuit

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E052 AA03 BA06 CA06 DA02 DB04 EA16 EB03 EC01 GA06 GB01 GB06 GB20 GC01 GC07 KA08

Claims (3)

[Claims] An opening / closing device for opening a sliding door, a self-closing mechanism for closing the sliding door, a proximity switch for detecting a fully opened position of the sliding door, a photoelectric sensor provided between the openings, and a switch for opening and closing the sliding door. In a sliding door device comprising a control unit for controlling, while the control unit receives both a fully open signal from the proximity switch and a detection signal from the photoelectric switch, a sliding door holding unit that regulates movement of the sliding door. Sliding door device characterized by operating. 2. A switchgear for opening a sliding door, a self-closing mechanism for closing the sliding door, a proximity switch for detecting a fully opened position of the sliding door, and a control unit for controlling opening and closing of the sliding door. In the sliding door device, when the control unit receives a fully open signal from the proximity switch, the control unit activates a sliding door holding unit that restricts movement of the sliding door for a predetermined time. 3. The sliding door device according to claim 1, wherein the sliding door holding means applies a DC voltage to the switch to restrict the movement of the sliding door.