Switching device

Abstract

To improve the reliability of the control of the electric pressing mechanism. [Solution] An opening / closing device comprising: an opening / closing body 10 that closes in a manner that partitions a space; a guide rail 20 that guides the widthwise end of the opening / closing body 10 in the opening / closing direction; an electric pressing mechanism that pushes the closed opening / closing body 10 and presses it against a fixed part; a pressing amount sensing unit that emits a signal when the amount of movement of the electric pressing mechanism exceeds a predetermined amount; and a pressing current sensing unit that emits a signal when the operating current of the electric pressing mechanism exceeds a threshold; wherein, after the operation of the electric pressing mechanism has started, if both the signal from the pressing amount sensing unit and the signal from the pressing current sensing unit are emitted, the operation of the electric pressing mechanism is stopped.

Description

Technical Field

[0001] The present invention relates to an opening / closing device configured to press a closed opening / closing body against a fixed part to enhance the closing property.

Background Art

[0002] Conventionally, inventions of this type include an opening / closing body that closes by stacking a plurality of panels, a guide rail that guides end portions in the width direction of the opening / closing body in the opening / closing direction, an electric vertical pressing mechanism that pushes the closed opening / closing body downward and presses it watertightly against a lower frame surface or the like, and an electric horizontal pressing mechanism that pushes the opening / closing body in the horizontal direction and presses it watertightly against the guide rail (see, for example, Patent Document 1). In such a conventional technique, for each of the vertical pressing mechanism and the horizontal pressing mechanism, when the operating current exceeds a preset threshold value, it is regarded that the opening / closing body is pressed watertightly against the lower frame surface, the guide rail, or the like, and the pressing operation is stopped.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, according to the above conventional technique, there is a risk that the current value exceeds the threshold value due to mechanical friction, snagging, actuator failure, etc. before the opening / closing body is sufficiently pressed against the lower frame surface, the guide rail, or the like.

Means for Solving the Problems

[0005] In view of such problems, one aspect of the present invention has the following configuration. An opening and closing device comprising: an opening and closing body that closes in a manner that partitions a space; guide rails that guide the widthwise end of the opening and closing body in the opening and closing direction; an electric pressing mechanism that pushes the closed opening and closing body and presses it against a fixed part; a pressing amount sensing unit that emits a signal when the amount of movement of the electric pressing mechanism exceeds a predetermined amount; and a pressing current sensing unit that emits a signal when the operating current of the electric pressing mechanism exceeds a threshold; wherein, after the operation of the electric pressing mechanism has started, if both the signal from the pressing amount sensing unit and the signal from the pressing current sensing unit are emitted, the operation of the electric pressing mechanism is stopped. [Effects of the Invention]

[0006] As described above, the present invention is configured in such a way that it can improve the reliability of the control of the electric pressing mechanism. [Brief explanation of the drawing]

[0007] [Figure 1] This is a front view showing an example of an opening and closing device according to the present invention. [Figure 2] This is a longitudinal cross-sectional view along the line (II)-(II) in Figure 1. [Figure 3] This is a longitudinal cross-sectional view along the line (III)-(III) in Figure 1. [Figure 4] This is a cross-sectional view along the line (IV)-(IV) in Figure 1. [Figure 5] This flowchart shows an example of control for an electric pressing mechanism. [Figure 6] This is a flowchart showing the process that follows Figure 5. [Modes for carrying out the invention]

[0008] Next, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, "upstream side" refers to the upstream side in the assumed direction of water flow, and "downstream side" refers to the downstream side in the assumed direction of water flow, which is the opposite direction to the upstream side. In this embodiment, it is assumed that water flows from the outdoor side to the indoor side (see Figures 2 to 4).

[0009] <Specific Embodiments> Figures 1 to 4 show an example of an opening / closing device according to the present invention. This opening / closing device 1 comprises an opening / closing body 10 that closes in a manner that partitions a space, left and right guide rails 20, 20 that guide the widthwise ends of the opening / closing body 10 in the opening / closing direction, a storage section 30 that extends or stores the opening / closing body 10 above it, a vertical pressing mechanism 40 (electric pressing mechanism) that presses the closed opening / closing body 10 against a lower stationary part G (for example, the floor, ground, lower frame, threshold, etc.), a horizontal pressing mechanism 50 (electric pressing mechanism) that presses the closed opening / closing body 10 against the guide rail 20, which is a downstream stationary part, and a control unit 60 that controls the vertical pressing mechanism 40 and the horizontal pressing mechanism 50, etc. This opening / closing device 1 is installed in the opening of a building or other structure and constitutes a water-stopping shutter device that prevents water from flowing from the outside to the inside during floods.

[0010] The opening / closing body 10 stacks multiple panels 11 and 12, which are sequentially extended in the closing direction by the storage section 30, almost vertically on the immovable part G to reach a fully closed state (see Figures 2 and 3). Multiple panels 11 and 12 are connected in the opening and closing direction via a support shaft 13 and a panel connecting chain 14, etc. In the figure, reference numeral 12 denotes the uppermost panel.

[0011] When the opening / closing body 10 is fully closed, the vertically adjacent panels 11, 11 (or 11, 12) are in watertight contact via the sealing portion 16. In addition, the lowest panel 11 is in watertight contact with the lower stationary part G via the sealing portion 16 (see Figure 2).

[0012] The seal part 16 is formed of an elastic material such as rubber or an elastomer resin, and is elastically contracted by the operation of the vertical pressing mechanism 40 described later to enhance the watertightness between the upper and lower panels 11, 11 (or 11, 12) and between the lowermost panel 11 and the fixed part G.

[0013] Further, the opening / closing body 10 in the fully closed state is pushed horizontally by the horizontal pressing mechanism 50 described later and is hermetically pressed against the inside of the guide rail 20 (see FIG. 4).

[0014] The guide rail 20 has a substantially concave cross section continuously in the vertical direction so as to surround the widthwise end portions of the opening / closing body 10 in the closed state, and is formed in a long shape extending from the lower fixed part G to the storage part 30. Inside this guide rail 20, a motion direction conversion mechanism 52 constituting the horizontal pressing mechanism 50 described later, a receiving part 21 for hermetically receiving the opening / closing body 10 on its downstream side, etc. are provided. The guide rail 20 and the receiving part 21 are fixed parts that are immovable on the downstream side with respect to the opening / closing body 10 pushed by the horizontal pressing mechanism 50.

[0015] The receiving part 21 is an elastic body made of rubber or an elastomer resin and is continuous over substantially the entire vertical length of the guide rail 20. This receiving part 21 is pressed against the opening / closing body 10 and elastically contracts to enhance the watertightness between the opening / closing body 10 and the guide rail 20.

[0016] The storage part 30 is fixed to the wall surface of a housing or the like, which is the object to be installed with the opening / closing device 1, above the opening opened and closed by the opening / closing body 10. As shown in FIG. 2, this storage part 30 supports a sprocket 31 around which a panel connecting chain 14 is wound on a base 30a fixed to an immovable wall surface, an electric drive mechanism 32 for rotating this sprocket 31 in both directions, a storage rail 33 for suspending and guiding the panels 11, 12 in the front-rear direction, etc.

[0017] Further, inside the storage part 30 and the guide rail 20, there are provided a vertical pressing mechanism 40 that presses the opening / closing body 10 in a fully closed state substantially vertically so as to press it against the fixed part G, and a horizontal pressing mechanism 50 that presses the opening / closing body 10 in a fully closed state substantially horizontally so as to press it against the receiving part 21 in the guide rail 20.

[0018] The vertical pressing mechanism 40 is an electric pressing mechanism that electrically presses the opening / closing body 10 in a closed state downward to press it against the fixed part on the closing direction side. A plurality (four in the illustrated example) of the vertical pressing mechanisms 40 are provided at intervals in the width direction of the opening / closing body (see FIG. 1).

[0019] Specifically, each vertical pressing mechanism 40 includes an actuator 41 that moves a diagonally downward rod 41a forward and backward by an electric motor, and a link mechanism 42 that rotates a pressing part 42a in an arc shape by the forward and backward movement of the rod 41a. The pressing part 42a that rotates by the drive of the actuator 41 abuts against the upper end part of the opening / closing body 10 in a closed state, and is configured to push and move the opening / closing body 10 downward (see FIG. 2). According to the illustrated example, the two left and right rods 41a, 41a are connected by a single horizontally long pressing part 42a and perform forward and backward movement synchronously.

[0020] Each actuator 41 includes a vertical pressing amount sensing part 41b as means for emitting a signal when it senses that the operating part of the vertical pressing mechanism 40 has reached a predetermined position. The vertical pressing amount sensing part 41b is a contact type or non-contact type position sensor (for example, a proximity switch, a limit switch, etc.) that senses the rod 41a that has advanced to a predetermined position, and is incorporated in the actuator 41. The sensing signal of the vertical pressing amount sensing part 41b may be a contact signal that turns ON when the rod 41a advances to the predetermined position and turns OFF when the rod 41a retreats from the predetermined position. This sensing signal is input to the control part 60 via a signal line not shown.

[0021] The horizontal pressing mechanism 50 is an electrically operated pressing mechanism that pushes the closed opening / closing body 10 and presses it against a stationary part adjacent to the downstream side of the opening / closing body 10 (in the illustrated example, the receiving part 21 in the guide rail 20). Two horizontal pressing mechanisms 50 are provided, one for each of the left and right guide rails 20, 20 (see Figure 1).

[0022] Each horizontal pressing mechanism 50 includes an actuator 51 that moves a downward rod 51a forward and backward using an electric motor, a motion direction conversion mechanism 52 that converts the vertical movement of the rod 51a into horizontal movement using a link member or the like, and a pressing part 53 that moves horizontally by the motion direction conversion mechanism 52. The pressing part 53 pushes the opening / closing body 10 and presses it against the receiving part 21 in the guide rail 20 (see Figures 3 and 4).

[0023] Each actuator 51 is equipped with a horizontal pressure sensing unit 51b as a means for emitting a signal when it senses that the operating part of the horizontal pressing mechanism 50 has reached a predetermined position. The horizontal pressure sensing unit 51b is configured with a contact-type or non-contact-type position sensor (for example, a proximity switch or a limit switch) that senses the rod 51a when it has advanced to a predetermined position, and is built into the actuator 51. The sensing signal of the horizontal pressure sensing unit 51b may be, for example, a contact signal that turns ON when the rod 51a moves forward to the predetermined position and OFF when the rod 51a moves backward from the predetermined position. This sensing signal is input to the control unit 60 via a signal line (not shown).

[0024] In the figure, reference numeral 90 denotes a deflection suppression device that moves the movable column 91 towards the center in the width direction of the opening / closing body and presses this movable column 91 against the indoor side surface of the opening / closing body 10 to suppress the deflection of the opening / closing body 10.

[0025] The control unit 60 includes a sequencer (not shown) equipped with a CPU and memory device, a power supply circuit (not shown) that supplies power to each of the multiple actuators 41 and 51, and a vertical pressing current sensing unit 61 and a horizontal pressing current sensing unit 62 that measure the operating current of actuators 41 and 51.

[0026] The vertical pressing current sensing unit 61 is equipped with a current sensor or the like that senses the operating current of the actuator 41 that constitutes the vertical pressing mechanism 40, and is configured to emit an ON signal when the sensed current exceeds a predetermined threshold, and to emit an OFF signal when the sensed signal falls below the threshold.

[0027] Similarly, the horizontal pressing current sensing unit 62 is equipped with a current sensor or the like that senses the operating current of the actuator 51 that constitutes the horizontal pressing mechanism 50, and is configured to emit an ON signal when the sensed current exceeds a threshold and to emit an OFF signal when the sensed signal falls below the threshold.

[0028] These vertical pressing current sensing units 61 and horizontal pressing current sensing units 62 can be fitted with current sensors, such as current detection switches.

[0029] In this embodiment, in addition to the control unit 60 that controls the actuators 41 and 51, a control device (not shown) that controls the drive mechanism 32 is also provided. These control unit 60 and control device (not shown) can also be configured as an integrated control circuit. Furthermore, although the vertical pressing current sensing unit 61 and the horizontal pressing current sensing unit 62 are integrally incorporated into the control unit 60 in the illustrated example, they may be configured as separate components from the control unit 60.

[0030] <Flowchart> Next, an example of the control operation by the control unit 60 will be explained in detail with reference to the flowcharts shown in Figures 5 and 6. The control unit 60 starts its control operation when it receives a water shut-off ON signal while the opening / closing body 10 is in the fully closed state. Here, the water shut-off ON signal is a signal to initiate the water shut-off operation by the vertical pressing mechanism 40 and the horizontal pressing mechanism 50, and may be, for example, a signal emitted when the opening / closing body 10 is fully closed, or a signal emitted by manual operation.

[0031] When a water shut-off ON signal is received, the control unit 60 first starts operating the horizontal pressing mechanism 50 (step S1). More specifically, the control unit 60 advances the rod 51a from its initial position by supplying power to the actuator 51 of the horizontal pressing mechanism 50. As the rod 51a moves forward, the pressing unit 53 pushes the opening / closing body 10 downstream.

[0032] In step S2, it is determined whether the horizontal pressure amount sensing unit 51b of the horizontal pressing mechanism 50 is ON or OFF. If it is ON, the process proceeds to the next step S3; otherwise, the process moves to step S21.

[0033] In step S3, it is determined whether the horizontal pressing current sensing unit 62 is ON or OFF. If it is ON, the process proceeds to step S4; otherwise, the process moves to step S31.

[0034] In step S4, the operation of the horizontal pressing mechanism 50 is stopped by stopping the actuator 51. At this stopping point, the extension of the rod 51a of the actuator 51 pushes the opening / closing body 10 downstream, causing it to be pressed against the receiving part 21.

[0035] In other words, if signals are emitted from both the horizontal pressure amount sensing unit 51b and the horizontal pressure current sensing unit 62 after the horizontal pressure mechanism 50 has started operating, the operation of the horizontal pressure mechanism 50 is stopped.

[0036] In step S21, it is determined whether the horizontal pressing current sensing unit 62 is ON or OFF. If it is ON, the process proceeds to step S32; otherwise, the process proceeds to step S22. Note that the threshold value of the horizontal pressing current sensing unit 62 in step S21 and the threshold value of the horizontal pressing current sensing unit 62 in step S3 are the same, but they can also be made different.

[0037] In step S22, it is determined whether the count by the operation limit timer has exceeded a predetermined time limit. If it has exceeded the time limit, the process proceeds to step S32; otherwise, the process returns to step S2.

[0038] In step S31, it is determined whether the count by the operation limit timer has exceeded a predetermined time limit. If it has exceeded the time limit, the process proceeds to step S32; otherwise, the process returns to step S3.

[0039] The operation limit timer in steps S22 and S31 is a timer (not shown) provided by the control unit 60. This operation limit timer counts the elapsed time from the start of operation of the horizontal pressing mechanism 50 (step S1 above).

[0040] Furthermore, the time limit in steps S22 and S31 is a time pre-stored in the control unit 60. This time limit is set by adding an appropriate margin to the normal operating time from when the horizontal pressing mechanism 50 starts operating until the opening / closing body 10 presses the receiving part 21 by an appropriate amount.

[0041] In step S32, an abnormal operation is detected, an abnormality flag is set, an alarm is issued via sound, light, etc., and all operations of the vertical pressing mechanism 40 and the horizontal pressing mechanism 50 are stopped. This stopped state can be released by a manual reset operation, etc.

[0042] In other words, if the horizontal pressure sensing unit 51b is determined to be OFF in step S2, and the horizontal pressure current sensing unit 62 is determined to be ON in step S21, then mechanical friction, snagging, actuator failure, etc. are presumed, and an abnormality flag is set in step S32. Furthermore, if the operation limit timer exceeds the time limit in step S22 or S31, excessive operation of the horizontal pressing mechanism 50 is suspected, and therefore, an abnormality flag is set in step S32 from the standpoint of preventing damage.

[0043] Next, in step S5 shown in Figure 6, the vertical pressing mechanism 40 is activated. More specifically, the control unit 60 advances the rod 41a from its initial position by supplying power to the actuator 41 of the vertical pressing mechanism 40. This causes the rod 41a to rotate the pressing part 42a, which in turn presses the opening / closing body 10 downward.

[0044] In step S6, it is determined whether the vertical pressure amount sensing unit 41b of the vertical pressing mechanism 40 is ON or OFF. If it is ON, the process proceeds to the next step S7; otherwise, the process moves to step S61.

[0045] In step S7, it is determined whether the vertical pressing current sensing unit 61 is ON or OFF. If it is ON, the process proceeds to step S8; otherwise, the process moves to step S71.

[0046] In step S8, the operation of the vertical pressing mechanism 40 is stopped by stopping the actuator 41, thereby completing the water shutoff operation. At this stopping point, the extension of the rod 41a of the actuator 41 presses the opening / closing body 10 downward, causing it to be pressed against the immovable part G in a watertight manner.

[0047] In step S61, it is determined whether the vertical pressing current sensing unit 61 is ON or OFF. If it is ON, the process proceeds to step S72; otherwise, the process proceeds to step S62.

[0048] In step S62, it is determined whether the count by the operation limit timer has exceeded a predetermined time limit. If it has exceeded the time limit, the process proceeds to step S72; otherwise, the process returns to step S6.

[0049] In step S71, it is determined whether the count by the operation limit timer has exceeded a predetermined time limit. If it has exceeded the time limit, the process proceeds to step S72; otherwise, the process returns to step S7.

[0050] The time limits in steps S62 and S71 are set by adding an appropriate margin to the normal operating time from when the vertical pressing mechanism 40 starts operating until the opening / closing body 10 is pressed by an appropriate amount against the immovable part G.

[0051] Note that the time limits for step S22 and step S62 are different because they depend on the structure of the vertical pressing mechanism 40 and the horizontal pressing mechanism 50, respectively, but it is possible to make them approximately the same.

[0052] In step S72, an abnormal operation is detected, an abnormality flag is set, an alarm is issued via sound or light, and all operations of the vertical pressing mechanism 40 and the horizontal pressing mechanism 50 are stopped. This stopped state can be released by a manual reset operation.

[0053] In other words, if the vertical pressure sensing unit 41b is determined to be OFF in step S6, and the vertical pressure current sensing unit 61 is determined to be ON in step S61, then mechanical friction, snagging, actuator failure, etc. are presumed, and an abnormality flag is set in step S72. Furthermore, if the operation limit timer exceeds the time limit in step S62 or S71, excessive operation of the vertical pressing mechanism 40 is suspected, and therefore, an abnormality flag is set in step S72 from the standpoint of preventing damage.

[0054] Therefore, the opening / closing device 1 with the above configuration improves the reliability of the control of the vertical pressing mechanism 40 and the horizontal pressing mechanism 50, and ensures that the opening / closing body 10 is sufficiently pressed against the lower fixed part G and the downstream fixed part (guide rail 20), thereby achieving good watertightness.

[0055] <Variation> In the above embodiment, the vertical pressure sensing unit 41b is a sensor built into the actuator 41. However, this vertical pressure sensing unit 41b can also be a sensor located outside the actuator 41 that senses the operating parts of the vertical pressing mechanism 40 (for example, the rod 41a, the link mechanism 42, the pressing part 42a, etc.). Similarly, the horizontal pressure sensing unit 51b can also be a sensor located outside the actuator 51 that senses the operating parts of the horizontal pressing mechanism 50 (for example, the rod 51a, the motion direction changing mechanism 52, the pressing part 53, etc.).

[0056] Furthermore, in the above embodiment, the vertical pressure sensing unit 41b senses when the operating part of the vertical pressing mechanism 40 reaches a predetermined position and emits a signal. However, as another example of the vertical pressure sensing unit 41b, it is also possible to configure it to emit a signal when the operating time of the vertical pressing mechanism 40 reaches a predetermined time, and the operating amount of the vertical pressing mechanism 40 is deemed to have exceeded a predetermined amount. Similarly, another example of the horizontal pressure sensing unit 51b is a configuration in which, when the operating time of the horizontal pressing mechanism 50 reaches a predetermined time, the operating amount of the horizontal pressing mechanism 50 is deemed to have exceeded a predetermined amount, and a signal is emitted.

[0057] Furthermore, in the above embodiment, both the vertical pressing mechanism 40 and the horizontal pressing mechanism 50 are configured to push the closed opening / closing body 10 and press it against the immovable part, but as an alternative example, it is also possible to configure the system so that only one of the vertical pressing mechanism 40 or the horizontal pressing mechanism 50 pushes the closed opening / closing body 10 and presses it against the immovable part. In other words, for example, vertical watertightness can be ensured solely by the weight of the multiple panels 11, 12, and in such cases, the vertical pressing mechanism 40 can be omitted.

[0058] Furthermore, in the above embodiment, as a particularly preferred example, the horizontal pressing mechanism 50 was activated first and then the vertical pressing mechanism 40 was activated. However, other examples include the opposite configuration, where the vertical pressing mechanism 40 is activated first and then the horizontal pressing mechanism 50 is activated, or where the horizontal pressing mechanism 50 and the vertical pressing mechanism 40 are activated almost simultaneously, or where the operation of one of the vertical pressing mechanism 40 or the horizontal pressing mechanism 50 is started while the other is being operated.

[0059] Furthermore, the present invention is not limited to the specific configurations described above, and can be modified as appropriate without altering the essence of the invention.

[0060] <Summary> As described above, the above embodiment discloses the following invention. (1) An opening / closing device (see Figures 1 to 6) comprising: an opening / closing body that closes in a manner that partitions a space; guide rails that guide the widthwise end of the opening / closing body in the opening / closing direction; an electric pressing mechanism that pushes the closed opening / closing body and presses it against a fixed part; a pressing amount sensing unit that emits a signal when the amount of movement of the electric pressing mechanism exceeds a predetermined amount; and a pressing current sensing unit that emits a signal when the operating current of the electric pressing mechanism exceeds a threshold; wherein, after the operation of the electric pressing mechanism has started, if both the signal from the pressing amount sensing unit and the signal from the pressing current sensing unit are emitted, the operation of the electric pressing mechanism is stopped. (2) The opening / closing device according to (1) (see Figures 2 and 3), characterized in that the pressing amount sensing unit considers the amount of operation of the electric pressing mechanism to have exceeded a predetermined amount when the operating part of the electric pressing mechanism reaches a predetermined position. (3) The opening / closing device according to (1), characterized in that the pressing amount sensing unit considers the amount of operation of the electric pressing mechanism to have exceeded a predetermined amount when the operating time of the electric pressing mechanism reaches a predetermined time. (4) A switchgear according to any one of (1) to (3) (see Figures 5 and 6), characterized in that if no signal is emitted from the pressure amount sensing unit and a signal is emitted from the pressure current sensing unit, it is considered to be abnormal operation. (5) The opening and closing device according to any one of (1) to (4) (see Figures 5 and 6), characterized in that if no signal is emitted from the pressing current sensing unit and the operating time of the electric pressing mechanism exceeds a predetermined time limit, it is considered to be abnormal operation. (6) An opening / closing device according to any one of (1) to (5) (see Figures 1 to 6), comprising a vertical pressing mechanism that presses the closed opening / closing body against a fixed lower part, and a horizontal pressing mechanism that presses the closed opening / closing body against the guide rail, wherein at least one of these two mechanisms constitutes the electric pressing mechanism. [Explanation of Symbols]

[0061] 1. Switching device 10 Opening / closing mechanism Panels 11 and 12 20 Guide Rails 21 Receiving Department 30 Storage compartments 40. Vertical pressing mechanism (electric pressing mechanism) 41 Actuator 41a Rod 41b Vertical pressure sensing unit 42 Link mechanism 42a Pressing part 50 Horizontal pressing mechanism (electric pressing mechanism) 51 Actuator 51a Rod 51b Horizontal pressure sensing unit 52 Motion direction change mechanism 53 Pressing part 60 Control Unit 61 Vertical pressing current sensing unit 62 Horizontal pressing current sensing unit

Claims

1. The device comprises an opening / closing body that closes to partition a space, a guide rail that guides the widthwise end of the opening / closing body in the opening / closing direction, an electric pressing mechanism that pushes the closed opening / closing body and presses it against a stationary part, a pressing amount sensing unit that emits a signal when the amount of movement of the electric pressing mechanism exceeds a predetermined amount, and a pressing current sensing unit that emits a signal when the operating current of the electric pressing mechanism exceeds a threshold, An opening / closing device characterized in that, after the operation of the electric pressing mechanism has started, if both the signal from the pressing amount sensing unit and the signal from the pressing current sensing unit are emitted, the operation of the electric pressing mechanism is stopped.

2. The opening / closing device according to claim 1, characterized in that the pressing amount sensing unit considers the amount of operation of the electric pressing mechanism to have exceeded a predetermined amount when the operating part of the electric pressing mechanism reaches a predetermined position.

3. The opening / closing device according to claim 1, characterized in that the pressing amount sensing unit considers the amount of operation of the electric pressing mechanism to have exceeded a predetermined amount when the operating time of the electric pressing mechanism reaches a predetermined time.

4. The switching device according to claim 1, characterized in that if no signal is emitted from the pressure amount sensing unit and a signal is emitted from the pressure current sensing unit, it is considered to be abnormal operation.

5. The opening and closing device according to claim 1, characterized in that if no signal is emitted from the pressing current sensing unit and the operating time of the electric pressing mechanism exceeds a predetermined time limit, it is considered to be abnormal operation.

6. An opening / closing device according to any one of claims 1 to 5, comprising a vertical pressing mechanism that presses the closed opening / closing body against a fixed part below, and a horizontal pressing mechanism that presses the closed opening / closing body against the guide rail, wherein at least one of these two mechanisms constitutes the electric pressing mechanism.

Images