JPH078797Y2 - Drive stop device for shutter - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a shutter drive stopping device, and more particularly to a shutter driving device capable of reliably preventing the occurrence of a reverse winding accident by monitoring the opening / closing state of the shutter. Regarding the stop device.

[Technical background]

An electric shutter is a motor-driven sprocket for an opening / closing machine and an endless chain such as a roller chain placed in parallel between a sprocket for a winding shaft and a slat wound around the winding shaft. When the slat is unwound and raised to the upper limit position or lowered to the lower limit position, the upper limit switch or the lower limit switch is actuated to automatically stop the driving of the motor. .

However, for example, if the setting position of the lower limit switch is incorrect, or if the slats unwinding and descending from the winding shaft hit an obstacle on the way, the slats wound around the winding shaft may A reverse winding accident occurs in which the winding is performed in the opposite direction to the regular winding direction.

[Problems of conventional technology]

Therefore, conventionally, in order to prevent such a reverse winding phenomenon of the shutter, a reverse winding prevention switch as shown in FIGS. 5 and 6 is provided.

That is, in FIG. 5, a foot switch type pressure switch 4 is arranged in a shutter case 3 accommodating a winding shaft 2 for winding the slat 1, and the slat 1 unwound from the winding shaft 2 is reversely wound. Immediately before the shift to, when the bulge due to the collapse of the coil occurs outward from the state shown by the chain line in the figure as shown by the solid line, this bulge presses the push switch 4 and issues a shutter drive stop signal. Is made.

Further, in FIG. 6, the slat 1 started to be wound in the reverse winding direction from the state shown by the chain line as shown by the solid line is pressed against the operator 7 of the limit switch 6 arranged on the lintel 5 and the shutter is released. The drive stop signal is generated.

However, in the case where the slats 1 thus collapsed are brought into contact with the pressing switch 4 or the limit switch 6 to stop the driving of the shutter, the switches 4 and 6 are collapsed by the collapsed slats 1. In addition, it may take a long time from the occurrence of the abnormality of the shutter to the stop of the driving thereof, and the shutter itself may be damaged.

Further, as shown in FIG. 5, when the swell of the slat 1 pushes the push switch 4, the switch 4
There is also a problem in that reliability is lacking because the operation of is dependent on how the slat 1 swells.

Further, when the slat 1 is wound up to the upper limit position and the upper limit switch does not operate when the shutter is opened, an accident such as the seat plate 8 attached to the lower end of the slat 1 getting into the lintel 5 may occur. It may occur.

For this reason, a type has been proposed in which the shutter slat reaches the upper limit position and the lower limit position without contact, without using a mechanical switch such as a limit switch (Actual No. Sho 59-186397). See the bulletin).

This is because a rotary encoder having through holes formed at predetermined intervals along the circumferential direction of a disk is attached to a rotating shaft of a motor, and a transmitted light is detected by an optical sensor to output a pulse signal. The number of pulses is counted to detect that the upper limit position and the lower limit position have been reached.

However, when a rotary encoder is used as a means for generating a pulse, in order to detect the upper limit position and the lower limit position with high accuracy, it is necessary to generate the pulse at a short cycle. Not only is it difficult to process, it also requires additional work to attach this to the rotary shaft of the motor, and since it is necessary to install a sensor that detects the through hole, the cost will increase. There's a problem.

Furthermore, since a normal shutter does not have a space for installing a rotary encoder and the rotary shaft is not formed so that a rotary encoder can be mounted, a shutter that is not specially designed cannot be used. It is not possible to provide a stop device.

[Purpose of device]

Therefore, in the present invention, when opening and closing the shutter, if the slats to be raised or processed do not stop even if they reach the upper limit position or the lower limit position, respectively, this is immediately detected without touching the slats and the shutter The drive can be stopped reliably, and at the same time, the manufacturing cost is low.
The purpose is to be able to easily attach it to any shutter, new or existing.

[Constitution of device]

In order to achieve this object, the present invention provides an endless chain which is hung in parallel between a sprocket rotatably driven by a motor of an opening / closing machine and a sprocket of a winding shaft to wind and unwind a slat. In the shutter drive stop device formed, a pulse generating means for outputting a pulse signal in association with the winding and unwinding of the slat, a counter for counting the output pulses,
With a control device for stopping the drive of the motor when the count result of the counter reaches a predetermined value,
The pulse generating means detects the endless chain in which the connecting shafts are provided at regular intervals, and detects the pulse when each connecting shaft passes a predetermined position when the endless chain travels in the forward and reverse directions. It is characterized by comprising a sensor for outputting.

[Function of device]

According to the present invention, a pulse signal is output from the sensor every time each connecting shaft of the endless chain that has started traveling by driving the motor of the switch passes a predetermined position, and the pulse number is counted by the counter. Since the driving of the motor is stopped when the count result of the counter reaches a predetermined value, the pulse signal output from the sensor during the stroke from the upper limit position to the lower limit position of the ascending or descending shutter. If a count number corresponding to the number is preset in the counter, the shutter is automatically stopped when the driving is started and the count number is reached.

Therefore, when closing the shutter, even if the lower limit switch does not operate even if the slat is completely unwound from the winding shaft, it immediately detects that the unwinding amount of the slat has reached the lower limit. Thus, it is possible to surely stop the driving of the shutter and reliably prevent the reverse winding accident.

Also, when opening the shutter, even if the upper limit switch does not operate even if the slat is wound up on the winding shaft, it immediately detects that the slat has reached the upper limit and drives the shutter. It is possible to reliably prevent an accident in which the seat plate attached to the lower end of the slat bites into the lintel by stopping.

In addition, since the endless chain provided in the electric shutter is used as it is to generate the pulse in order to transmit the torque of the motor to the winding shaft, it can be applied to any shutter, new or existing. can do.

Furthermore, since the connecting shafts of the endless chain are provided at short intervals, a pulse signal having a short cycle is output from the sensor, and it is possible to accurately detect that the slats have reached the upper limit and the lower limit.

〔Example〕

Hereinafter, the present invention will be described based on specific embodiments shown in the drawings.

FIG. 1 is a flow chart showing an example of a shutter drive stopping device according to the present invention.

The same parts as those in FIGS. 5 and 6 are designated by the same reference numerals, and detailed description thereof will be omitted.

In the figure, reference numeral 10 is an opening / closing machine that drives a sprocket 12 to rotate forward and backward by a motor 11, and an endless chain 14 for power transmission is hung in parallel between the sprocket 12 and the sprocket 13 of the winding shaft 2. ing.

As the endless chain 14, for example, a roller chain in which a cylindrical roller 16 is externally fitted to each connecting shaft 15 is used.

Reference numeral 17 denotes an optical sensor such as a Cds cell, a photodiode, a phototransistor, or an optical thyristor, which is vertically opposed to the light source 18 such as a light emitting diode with the endless chain 14 interposed therebetween. When the shutter is opened and closed, the pulse generating means for outputting a pulse signal is the endless chain.
14 and an optical sensor 17, the light emitted from a light source (E / O) 18 is interrupted intermittently by a roller 16 fitted on each connecting shaft 15, 15 of the endless chain 14 to generate an optical pulse. The optical sensor (O / E) 17 receives the light and outputs an electric pulse signal.

As described above, since the optical sensor 17 and the light source 18 need only be arranged with the endless chain 14 used as the driving means of the electric shutter interposed therebetween, the construction is extremely simple and the shutter provided with the endless chain 14 is arranged. In this case, it can be easily attached to any shutter, new or existing, and since the endless chain 14 has the connecting shafts 15 at short intervals, the optical sensor 17 outputs pulses with a short cycle. The signal is output.

Reference numeral 19 is a counter (electronic circuit) that counts the electric pulse signals amplified by the amplifier 20 output from the optical sensor 17, and 21 is when the rotation of the motor 11 is transmitted through a chain or gears and the shutter reaches the upper limit position. An upper limit switch that outputs a switch signal, 22 is a lower limit switch that outputs a switch signal when the shutter reaches the lower limit position, 23 is an up button 24, a stop button 25, and a down button 26
Is a push button switch.

Reference numeral 27 denotes a control device composed of, for example, a microcomputer, and from its input port, each switch signal output from the push button switch 23, the upper limit switch 21 and the lower limit switch 22, and the pulse output from the counter 19 Each counting result is input, and a reset signal for resetting the counter 19 and a control signal for turning on / off the power of the motor 11 and rotating the motor 11 in the forward direction or the reverse direction are output from the output port thereof. Has been done.

This control device 27 is a lift button of the push button switch 23.
When the switch button 24 or the down button 26 is turned on and each switch signal is input, a reset signal for resetting the counter 19 is output and a control signal for turning on the power supply of the motor 11 is output. Further, when the upper limit switch 21 or the lower limit switch 22 is turned on and each switch signal is input, or when it is determined that the counting result of the pulse input from the counter 19 has reached a preset predetermined value,
The control signal for turning off the power source of the motor 11 is output.

The processing procedure of the control device 27 will be described below with reference to the flowchart shown in FIG.

When the slat 1 is unwound from the take-up shaft 2 and the shutter is closed, the lowering button 26 of the push button switch 23 is turned on to start the processing shown in FIG. 2, and the counter 19 is first reset in step. After that, the process proceeds to step and the motor 11 is turned on to drive the motor 11 in the normal direction.

Next, move to the step and set the lower limit switch 22
The lower limit switch
When it is determined that 22 is ON, the process proceeds to step, the power of the motor 11 is turned off to stop the driving of the shutter, and the process is ended.

On the other hand, when it is determined in step that the lower limit switch 22 is not turned on, the process proceeds to step and it is determined whether or not the count result of the counter 19 has reached a preset predetermined value.

Here, the “predetermined value” is the number of pulse signals output from the optical sensor 17 during the stroke from the upper limit position to the lower limit position of the rising or falling shutter slat 1 is n.
In the case of individual pieces, it is set to (n + 1), for example.

If the count result of the counter 19 reaches (n + 1) in step, the process moves to step
The power supply of 11 is turned off to end the processing, and the counting result is (n +
1) If it is below, return to step.

The above is an example of the structure of the shutter drive stopping device according to the present invention. Next, its operation and effect will be described.

First, the number of pulse signals output from the optical sensor 17 is preliminarily measured during the stroke in which the shutter slat 1 moves up or down, and if the number of pulses is 250, for example, 250
The control device 27 stores and sets + 1 = 251 as a predetermined value.

In this state, when the down button 26 of the push button switch 23 is turned on, a reset signal is output from the control device 27 to the counter 19 and the value of the counter 19 is reset to "0" (step) and the power of the motor 11 is turned on. A control signal for turning on is output (step), and the sprocket 12 of the opening / closing machine 10 is rotationally driven in a direction of unwinding the slat 1 wound on the winding shaft 2 and is hung in parallel between the sprockets 12 and 13. The traveling of the endless chain 14 is started.

At the same time, the light from the light source 18 is fitted onto the connecting shafts 15, 15 ...
Is interrupted intermittently by the light source and converted into a light pulse, which is the light source.
The electric pulse signal is received by the optical sensor 17 facing the 18, and an electric pulse signal is output. The electric pulse signal is amplified by the amplifier 20 and input to the counter 19.

The counter 19 counts the pulses and outputs the counting result to the control device 27.

Next, the control device 27 determines whether or not the lower limit switch 22 is turned on (step), and at the same time, determines whether or not the counting result from the counter 19 has reached a predetermined value “251”. (Step), when the slat 1 reaches the lower limit position and the lower limit switch 22 normally outputs a switch signal (at this time, the count result of the counter 19 is "250"), the power of the motor 11 is turned off. A signal is output to stop the driving of the motor 11 (step). Further, even if the switch signal from the lower limit switch 22 is not issued, the counting result of the counter 19 is "251" which is a predetermined value.
When it reaches, the control signal for turning off the power of the motor 11 is output to immediately stop the driving of the motor 11 (step).

As a result, even if the setting position of the lower limit switch 22 is incorrect and the lower limit switch 22 does not operate normally, or even if the slat 1 that is descending hits an obstacle or the like on the way, a slight amount of slat 1 It is possible to detect excessive unwinding promptly and surely, stop driving the shutter immediately, and prevent reverse shutter winding accident. Further, since the occurrence of such an abnormality can be detected by the non-contact type non-sensor 17 without contacting the slats 1 as in the conventional case, there is no possibility that the drive stopping device itself is damaged.

Next, when the slat 1 reaches the lower limit position and opens the shutter in the closed state as described above,
This time, the up button 24 of the push button switch 23 is turned on to reset the value of the counter 19 to "0" again (step), and at the same time, the power of the motor 11 is turned on to turn on the motor.
11 is rotationally driven in the opposite direction to the above (step).

At the same time, the light from the light source 18 is intermittently converted by the connecting shafts 15, 15 ... Of the endless chain 14 to be converted into an optical pulse, and an optical pulse signal is output from an optical sensor 17 which receives the optical pulse, The number of pulses is counted by the counter 19.

Then, the control device 27 determines whether or not the upper limit switch 21 is turned on (step), and also determines whether or not the counting result from the counter 19 reaches a predetermined value “251” (step). ), When the slat 1 reaches the upper limit position and a switch signal is normally issued from the upper limit switch 21 (the count result of the counter 19 is “250” at this time), a control signal for turning off the power of the motor 11 is sent. It outputs and stops the drive of the motor 11 (step). Even when the switch signal from the upper limit switch 21 is not issued, when the count result of the counter 19 reaches the predetermined value "251", the control signal for turning off the power of the motor 11 is output to output the motor. Immediately stop the driving of 11 (step).

As a result, even if the upper limit switch 21 does not operate normally due to a deviation in the setting position of the upper limit switch 21, when the shutter slightly overruns the upper limit position, the drive is immediately stopped. An accident that the seat plate 8 attached to the lower end bites into the lintel 5 is prevented in advance.

In the present invention, as shown in FIG. 3, the light emitting ends of the light transmitting optical fiber 29 and the light receiving optical fiber 30 are vertically opposed to each other with the endless chain 14 interposed therebetween so that the light source 18 such as a laser diode can be used. The emitted light passes through the light transmitting optical fiber 29 and is emitted from the rod lens 31 attached to the tip of the optical fiber 29, and is incident on the light receiving optical fiber 30 also attached to the tip of the rod lens 32. It may be converted into an electric signal through an optical sensor 30 such as a photodiode through the optical fiber 30.

Although not shown, the light emitted from the tip of the light transmitting optical fiber 29 is reflected by the roller 16 fitted onto the connecting shaft 15 of the endless chain 14 from the tip of the light receiving optical fiber 30. You may make it incident.

Further, the sensor that outputs a pulse signal each time each connecting shaft 15 of the endless chain 14 passes a predetermined position is not limited to the case where the optical sensor 17 is used as described above, and for example, an oscillation coil or an electrode plate of a high frequency oscillation circuit. Using a proximity switch that electrically detects the approach of an object as a detection head, each connecting shaft 15
The electrode pulse signal may be output each time the pulse passes.

In the present invention, the control shown in FIG. 4 may be performed by using the counter 19 capable of addition and subtraction.

That is, FIG. 4 is a flow chart showing another example of the processing procedure of the control device 27. As the counter 19, an addition / subtraction counter that does not need to be reset is used. For example, when the slat 1 of the shutter is at the upper limit position, It becomes "0" and becomes "250" when it is at the lower limit position.

Then, when the push button switch 23 is turned on, first in step it is the up button 24 or the down button 26.
If the down button 26 is turned on, the process proceeds to step and the count number n of the counter 19 is
If it is <250, and if n <250, the power of the motor 11 is turned on in step to drive the motor 11 in the normal direction to start the unwinding of the shutter, and at the same time, the process proceeds to step and the count number is increased. Will be added. If the determination result in step is not n <250, the shutter has already reached the lower limit position, and the process returns to step.

In the step, it is judged whether or not the stop button 25 or the lower limit switch 22 is turned on, and either switch 25
Or when 22 is turned on, move to step and
Turn off the power of 11 to stop the drive of the shutter, and then return to the step. If the switch 25 or 22 is not turned on, the process proceeds to step to determine whether or not the count number n of the counter 19 is n = 251. If n = 251 is not reached, the process returns to the step, and if n is reached, it is reached. After shifting to the step, the power of the motor 11 is turned off, the driving of the shutter is immediately stopped, and the processing is ended.

As a result, the occurrence of the reverse winding accident of the shutter can be prevented.

In addition, when the stop button 25 is turned on in step, the power of the motor 11 is turned off in step, and the descending button 26 is turned on again while the driving of the shutter being descended is stopped midway, the same steps as above are performed. When the processing after the step is executed and the count number of the counter 19 is started to be added again to reach n = 251 (step) or the lower limit switch 22 or the stop button 25 is turned on (step), the motor 11 The power is turned off.

Further, when the ascending button 24 is turned on with the shutter stopped halfway as described above, the process moves from step to step and it is determined whether or not the count number n> 0,
If it is determined that n> 0, the shutter has not reached the upper limit position, so the process proceeds to step, the power of the motor 11 is turned on to drive the motor 11 in the reverse direction, the winding of the shutter is started, and at the same time, the process proceeds to step. Then, the count number is subtracted. If n> 0, the shutter has already reached the upper limit position.
Return to the step without driving.

In step, it is determined whether or not the stop button 25 or the upper limit switch 21 is turned on. When these switches 25 or 21 are turned on, the process proceeds to step and the motor
Turn off the power of 11 to stop the drive of the shutter, and then return to the step. When it is determined that the switch 25 or 21 is not turned on, the process proceeds to step to determine whether or not the count number n = −1, and when n = −1, the process proceeds to step, The power of the motor 11 is turned off and the process is ended.

Therefore, even if the upper limit switch 21 does not operate, it is possible to immediately stop the driving of the shutter that has reached the upper limit position and reliably prevent an accident such as a seat plate biting into the lintel. .

Thus, the counter 19 at the shutter upper limit position
Is set to "0", the count number at the lower limit position is set to "250", and the control shown in FIG. 4 is performed using the addition / subtraction counter 19 that subtracts or adds the count number when the shutter moves up or down. If you perform a complicated operation such as stopping the descending shutter halfway and raising it, or stopping the rising shutter halfway and lowering it, the shutter will reach the upper limit position or the lower limit position. When the count number is "0" or less or "250" or more, the driving of the shutter can be reliably stopped.

[Effect of device]

As described above, according to the present invention, when the shutter is closed, even if the lower limit switch does not operate even if the slats are completely unwound from the winding shaft, the unwinding amount of the slats Has an excellent effect that the drive of the shutter can be surely stopped by detecting that the lower limit has reached the lower limit, and the occurrence of the reverse winding accident can be surely prevented.

Also, when opening the shutter, even if the upper limit switch does not operate even if the slat is wound up on the winding shaft, it immediately detects that the slat has reached the upper limit and drives the shutter. There is also an effect that the seat plate attached to the lower limit of the slats can surely be prevented from accidentally cutting into the lintel.

Moreover, as the pulse generating means, the endless chain used to open and close the electric shutter by transmitting the rotational force of the motor to the winding shaft is used as it is, and it is detected by the sensor that the connecting shaft has passed the predetermined position. Since it detects it, the sensor can be installed along the endless chain and it can be easily attached to any shutter, new or existing, and the endless chain has a short connecting shaft. Since it is provided in, the sensor outputs a pulse signal with a short cycle,
It has a very excellent effect that the position of the slat can be detected with high accuracy.

[Brief description of drawings]

FIG. 1 is a flow sheet diagram showing an example of a shutter drive stopping device according to the present invention, FIG. 2 is a flowchart showing a processing procedure of the control device, and FIG. 3 is a main part showing another embodiment of the present invention. FIG. 4 is a flow sheet diagram, FIG. 4 is a flowchart showing another example of the processing procedure of the control device, and FIGS. 5 and 6 are diagrams showing a conventional drive stopping device. Explanation of reference numerals 1 ... slat, 2 ... winding shaft, 5 ... grass, 8 ... seat plate, 10 ... opening / closing machine, 11 ... motor, 12 ...
Sprocket, 13 ... Sprocket, 14 ... Endless chain, 15 ... Connecting shaft, 17 ... Optical sensor, 18 ... Light source, 19 ...
… Counter, 21 …… Upper limit switch, 22 …… Lower limit switch, 23 …… Push button switch, 24 ……
Up button, 26 …… Down button, 27 …… Control device.

Claims (2)

[Scope of utility model registration request] 1. An endless chain (1) is provided between a sprocket (12) rotatably driven by a motor (11) of a switch (10) and a sprocket (13) of a winding shaft (2).
In a drive stop device for a shutter configured to wind and unwind the slat (1) by being hung in parallel with each other, a pulse generating means for outputting a pulse signal in association with the winding and unwinding of the slat (1). A counter (19) for counting the output pulses, and a controller (27) for stopping the driving of the motor (11) when the count result of the counter (19) reaches a predetermined value. At the same time, in the pulse generating means, the endless chain (14) in which the connecting shafts (15) are provided at regular intervals, and the endless chain (14) travel in the forward and reverse directions so that each connecting shaft (15) is predetermined. A drive stop device for a shutter, comprising: a sensor (17) which detects the passing of a position and outputs a pulse. 2. The sensor (17) receives light from a light source (18) which is intermittently converted by each connecting shaft (15) of the endless chain (14) and converted into an optical pulse to generate an electric pulse signal. Claim 1 of the utility model registration which is an optical sensor for output
The drive stop device for the shutter according to the item.