JP3128594B2 - Lower and upper limit detection device for shutter device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shutter device which can be used both as an obstacle detecting device for a shutter device and a detecting device for reaching the lower and upper limits of a shutter curtain.

[0002]

2. Description of the Related Art Conventionally, an obstacle detecting device for a shutter device and a detecting device for reaching a lower limit or an upper limit of a shutter curtain are configured as separate mechanisms. That is, in obstacle detection, a tape switch is disposed vertically spaced apart over the entire length in the longitudinal direction of the bottom surface of the seat plate, and when the seat plate hits an obstacle, the current flowing when the upper and lower tape switches come into contact with each other is reduced. On the other hand, the detection of the arrival of the lower limit and the upper limit of the shutter curtain is performed, for example, by providing upper and lower limit switches in the guide rail, and a seat plate or the like turning on the limit switches. Thus, the detection of the lower limit and the upper limit of the shutter curtain has been performed by detecting the rotation speed of a sprocket for raising and lowering the shutter curtain. In any case, the detection of the obstacle of the shutter device and the detection of reaching the lower limit and the upper limit are configured as separate mechanisms.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of the above situation, and performs the same mechanism for detecting an obstacle in a shutter device and detecting arrival of a shutter curtain at a lower limit and an upper limit. With this configuration, the structure of the shutter device is simplified, thereby reducing the number of manufacturing steps, reducing costs, and providing a shutter device that is easy to maintain.

[0004]

SUMMARY OF THE INVENTION A shutter curtain is guided by a guide rail to move by operation of a drive switch, and is a lower limit and upper limit detection device of a shutter device which performs opening and closing operations, and is provided along the guide rail. A tape switch in which the measured resistance value changes linearly in proportion to the measurement length, an obstacle detecting means disposed on a seat plate of the shutter device, and an obstacle detecting means disposed on the seat plate and provided by the obstacle detecting means A latch mechanism protruding so as to contact the tape switch when an obstacle is detected and when the shutter curtain reaches a lower limit position or an upper limit position; and a tape switch end and a latch when the latch mechanism is operated. Resistance detecting means for detecting a tape switch resistance value between the contact position of the mechanism and a resistance detected by the resistance detecting means; Determining means for determining whether the lower limit and upper limit of the seat plate have been reached and obstacle detection by the obstacle detecting means based on the value, and a control unit for controlling the movement of the shutter curtain based on the determination result by the determining means. It has a configuration to have.

[0005]

The operation of the present invention will be described with reference to FIG. The latch mechanism 2 is activated by the operation of the obstacle detection means 1 which also detects the upper limit and the lower limit, and the latch of the latch mechanism 2 projects and comes into contact with the tape switch 3. The resistance value detecting means 5 detects a tape switch resistance value between an end of the tape switch 3 and a latch abutting on the tape switch 3. The judging means 6 judges, based on the resistance value detected by the resistance value detecting means, whether an obstacle has been detected, the upper limit has been reached, or the lower limit has been reached. In the control unit 4,
The movement of the shutter curtain is controlled in response to the result of determination by the determination means 6.

[0006]

An embodiment of the present invention will be described with reference to the drawings.
FIG. 2 is a schematic front view of the shutter device 7. In the drawing, reference numeral 8 denotes a shutter curtain, which is guided by a guide rail 9 having a U-shaped cross section to ascend and descend. Two tape switches 3a and 3b are provided as ridges from the upper end to the lower end of the guide rail 9 at a position perpendicular to the shutter curtain 8 inside the guide rail 9. As shown in FIG. 4, the tape switches 3a and 3b have a thin line at the lower end and a lead wire R at the upper end.
1 and R2 are connected to a resistance value measuring device 5 constituting the control unit 4 described later. As shown in FIG. 3, a seat plate 12 on which a pressing rod 12 ′ protrudes is disposed below the shutter curtain 8, and below the seat plate 12,
A detection plate 13 for detecting an obstacle is loosely fitted inside the object,
Locking holes 14 formed on both side surfaces of the detection plate 13 are supported by a locking rod 15 fixed to the seat plate 12 so as to be suspended. Therefore, when the lowering of the detection plate 13 stops due to the obstacle, the seat plate 12 fits into the detection plate 13 by the length of the locking hole 14. The right part of the drawing, not shown, has the same structure with respect to the locking hole 14 and the locking rod 15.

Further, a latch 16 formed of a conductive member is provided on a detecting plate 13 at a position facing the pressing rod 12 'by a biasing force of a spring (not shown) by a support shaft 17 to form a latch 45. It is pivotally supported at an elevation angle of about °. Therefore, as described above, when the lowering of the seat plate 12 is stopped due to the obstacle and the detection plate 13 is fitted, the latch 16 is pushed down by the pressing rod 12 ′. The two tape switches 3a and 3b are brought into contact with each other. Detection plate 1
The latch 16 is brought into contact with the tape switches 3a and 3b by the same operation when the drum 3 reaches the draining plate 19. A protruding rod 18 protrudes from the upper end of the guide rail 9 (see FIG. 2). When the shutter curtain 8 rises and the detection plate 13 reaches the upper end of the guide rail 9, the latch 16 starts to operate. The tape switches 3a and 3b come into contact with each other by being locked by the protruding rod 18.

Reference numeral 4 denotes a control unit having a central processing unit (CPU). A measuring device 5 for measuring the resistance value of the tape switch 3, based on the resistance value measured by the measuring device 5,
It has a comparator 6 and the like as discriminating means for discriminating whether an upper limit or a lower limit has been reached or an obstacle has been detected. That is, FIG.
Are the tape switches 3a, 3a used in this embodiment.
b is a schematic graph showing the relationship between the measured length and the resistance value at + 22 ° C. and -20 ° C. As shown in this graph, the tape switches 3a and 3b
The measured length and the resistance value are in a linear proportional relationship. Therefore, as described above, when the latch 16 is actuated and comes into contact with the tape switches 3a and 3b, the resistance value from the lead wire R1 to the lead wire R2 via the latch 16 is detected. The resistance value of the latch 16 is compared in advance by the comparator 6 to which the resistance value at the time of reaching the lower limit, the resistance value at the time of reaching the upper limit, and the resistance value at the time of detecting other obstacles are input. Can determine the contact position,
This makes it possible to determine whether the lower limit has been reached, the upper limit has been reached, or an obstacle has been detected.

As shown in FIG. 4, the tape switches 3a and 3b are formed in a thin line at the lower end. This is to clearly distinguish reaching the lower limit from obstacle detection. That is, FIG. 4A shows the contact position of the latch 16 with the tape switches 3a and 3b when the lower limit is reached. This thin line portion has an extremely high resistance value, and accordingly, the lower limit is shown. The resistance values of the tape switches 3a and 3b measured at the time of arrival are also measured as high resistance, and the contact position of the latch 16 when the upper limit is reached as shown in FIG. Can be clearly distinguished from the detected resistance values of the tape switches 3a and 3b at the contact position of the latch 16 in FIG.

Reference symbol C shown in FIG. 2 is a controller,
BS which is an operation switch for raising the shutter curtain 8
1, a push button switch of BSS which is a stop operation switch and a push button switch of BSD which is a descending operation switch, and an alarm lamp EL which lights when the obstacle detection plate 13 detects an obstacle, an alarm sound And a buzzer BZ for notifying an obstacle detection is provided. The controller C is connected to the control unit 4 by a connection line 20.

In the lower limit and upper limit detecting device of the shutter device configured as described above, first, the operation of lowering the opened shutter curtain 8 to detect the lower limit will be described. This signal is sent to the control unit 4 via the connection line 20 by the push button of the BSD, which is the lowering operation switch of the controller C. The control unit 4 receives this signal and drives the motor 11 to rotate the winding drum 10, whereby the shutter curtain 8 starts lowering. When the detection plate 13 reaches the draining plate 19 and stops by this lowering, the seat plate 12 is fitted into the detection plate 13, and at this time, the pressing rod 12 ′ pushes down the latch 16. As a result, the latch 16 comes into contact with the tape switches 3a and 3b. The measuring device 5 detects the resistance values of the tape switches 3a, 3b passing through the lead wire R1, the latch 16, and the lead wire R2 at this time. The comparator 6, which has received the detected resistance value, determines that the lower limit has been reached by comparing the resistance value data with the previously input resistance value data of the lower limit position. The control unit 4 receives a signal indicating that the lower limit has been reached from the comparator 6, and
1 is stopped. As a result, the lowering of the shutter curtain 8 stops, and a series of lowering operations ends.

Next, the operation of detecting the upper limit by raising the closed shutter curtain 8 as shown in FIG. 2 will be described. This signal is sent to the control unit 4 via the connection line 20 by the push button of the BSU which is the operation switch for raising the controller C. The control unit 4 receives this signal, drives the motor 11 to rotate the drum 10, and the shutter curtain 8 starts to rise. When the shutter curtain reaches the upper end of the guide rail 9, the projecting rod 18 projecting from the guide rail 9 locks the latch 16 of the detection plate 13, and the latch 16 comes into contact with the tape switches 3a and 3b. By this contact, the measuring instrument 5 detects a resistance value from the lead wire R1 via the tape switch 3a, the latch 16, the tape switch 3b, and the lead wire R2. The detected resistance value is sent to the comparator 6 and is compared with the resistance values of the tape switches 3a and 3b at the time of reaching the upper limit previously input to the comparator 6 to determine that the upper limit has been reached. Upon receiving this data transmission, the control unit 4 sends out a motor stop signal. As a result, the drive of the motor 11 stops, and the raising operation of the shutter curtain 8 ends.

The operation at the time of detecting an obstacle will be described. When the shutter curtain 8 hits an obstacle while descending and stops descending, as described above, the detection plate 13
Is inserted. At this time, the pushing rod 12 ′ pushes the latch 16, so that the latch 16 moves the tape switch 3 a,
Contact 3b. The measuring device 5 is the tape switch 3 at this time.
The resistance values of a and 3b are detected and sent to the comparator 6. The comparator 6 compares the resistance value data with data input in advance, determines that an obstacle has been detected, and sends the data to the control unit 4. The control unit 4 thereby stops the rotation of the motor 11 and thereby controls the shutter curtain 8.
Descent stops. At the same time, the control unit 4 sends a signal to the controller C via the connection line 20 to turn on the alarm lamp EL and sound the buzzer BZ to notify that an obstacle has been detected.

The present invention is not limited to the above embodiment, but may take various forms. For example, a single tape switch may be used, and a resistance between the end of the tape switch and the latch 16 may be used. It is also possible to configure to measure and control the value.

[0015]

As described above, according to the present invention, it is possible to perform the detection of the lower limit and the upper limit of the shutter curtain in the shutter device and the safety device at the time of detecting an obstacle by the same mechanism. . Therefore,
The structure of the shutter device can be simplified, thereby making it possible to reduce costs by reducing the number of manufacturing steps and to simplify the structure to make the shutter device easy to maintain.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of the present invention.

FIG. 2 is a schematic front view of the shutter device.

FIG. 3 is an external perspective view of a seat plate and a detection plate portion.

FIG. 4 is a diagram illustrating a tape switch used in this embodiment and a contact position of a latch that contacts the tape switch.

FIG. 5 is a diagram showing a relationship between a measured length and a resistance value of a tape switch used in this embodiment.

[Explanation of symbols]

 1. Obstacle detecting means. Upper / lower limit detecting means 2. Latch mechanism 3. Tape switch 4. Controller 7. Resistance detecting means 6. Discriminating means 7. Shutter device 8. Shutter curtain 9, guide rail 10, winding drum 11, motor 12, seat plate 12 ', pressing rod 13, detecting plate 14, locking hole 15, locking rod 16, latch 17, support shaft 18, connection wire 19, Drainer 20 ・ Connection line C ・ ・ Controller BSU ・ Push button switch for BSS ・ Stop push button switch BSD ・ Push button switch for descend EL ・ Alarm light BZ ・ Buzzer

Claims (1)

(57) [Claims] 1. A lower limit and upper limit detection device for a shutter device in which a shutter curtain is guided by a guide rail and moved by an operation of a drive switch to perform an opening and closing operation, wherein a resistance value provided along the guide rail is provided. And a tape switch that changes linearly proportional to the measurement length, and is provided on the seat plate of the shutter device, and when an obstacle is detected by the obstacle detection means and when the shutter curtain reaches the lower limit position or the upper limit position. A latch mechanism protruding so as to abut the tape switch, and a resistance value detecting means for detecting a tape switch resistance value between the tape switch end and the contact position of the latch mechanism when the latch mechanism operates. Based on the resistance value detected by the resistance value detection means, the lower limit and the upper limit of the seat plate are reached and the obstacle detection is performed. Discriminating means for discriminating the obstacle detection by stage, lower and upper detection device of the shutter device, characterized in that a control unit for controlling the movement of the shutter curtain based on the determination result by the determination means.