JP7578475B2 - Piano wire position detection device - Google Patents

Description

The present invention relates to a piano wire position detection device.

When installing an elevator in a building's elevator shaft, the guide rail that guides the elevator car up and down must be installed in the elevator shaft. When installing the guide rail, it is necessary to center the guide rail precisely. For this reason, a piano wire with a weight attached is generally hung from the top to the bottom of the elevator shaft, and the guide rail is installed using this piano wire as a reference. Specifically, the worker measures the distance between the piano wire and the guide rail using a scale or similar device, adjusts the position of the guide rail based on the measurement, and then fixes the guide rail. At this time, the markings on the scale and the piano wire overlap, but the degree of overlap between the two changes depending on the viewing angle, or the scale is not properly applied, causing variations in the distance readings made by the worker. For this reason, the centering accuracy in the installation of the guide rail is not stable, and many adjustments are required due to insufficient accuracy.

Patent Document 1 describes technology related to an elevator installation measuring device that uses a sensor to detect the position of a piano wire. Specifically, Patent Document 1 describes that "an elevator installation measuring device is configured that includes a slide block that includes a sliding section that slides along a horizontally arranged gauge and has a scale reading surface, a sensor section that has a sensor that faces the piano wire, and a detector that notifies the detection state of the piano wire with light or sound based on the detection operation of the sensor attached to this sensor section." Patent Document 1 also describes that "two sets of sensors are positioned at different positions along the sliding direction of the slide block, and an alarm notifies the stopping position of the slide block by a detector and the sliding direction of the slide block to stop at this stopping position."

Special Publication No. 7-89055

However, the technique described in Patent Document 1 has the following problems.
The elevator installation measuring device described in Patent Document 1 includes two sets of fiber sensors for emitting and receiving light, and two detectors connected to the two sets of fiber sensors, and notifies the detection state of the piano wire with light or sound based on the output signal of each detector. However, the detection range of a transmission-type optical sensor, including the above-mentioned fiber sensor, is generally narrow, about several millimeters. Therefore, the technology described in Patent Document 1 only notifies when the piano wire is present within such a narrow detection range. Therefore, for example, when the elevator installation measuring device described in Patent Document 1 is used to detect the position of the piano wire in order to automate the centering work of the guide rail, the adjustment range of the guide rail is limited to a narrow range due to the narrow detection range of the transmission-type optical sensor.

The object of the present invention is to provide a piano wire position detection device technology that can detect the position of a piano wire with a wider detection range than conventional methods.

In order to solve the above problems, for example, the configurations described in the claims are adopted.
The present application includes a number of means for solving the above problems, one of which is a piano wire position detection device for detecting the position of a piano wire suspended in an elevator shaft, the device comprising a first optical detector having a first light-emitting unit and a first light-receiving unit, a second optical detector having a second light-emitting unit and a second light-receiving unit, and a zone determination unit for detecting the position of the piano wire in a zone based on a first output signal output by the first optical detector and a second output signal output by the second optical detector. The first optical detector and the second optical detector are arranged such that the position detection range of the piano wire in the first optical detector partially overlaps with the position detection range of the piano wire in the second optical detector. The zone determination unit detects the position of the piano wire in five zones based on a combination of the first output signal and the second output signal and state transitions of the first output signal and the second output signal.

According to the present invention, the position of the piano wire can be detected over a wider detection range than in the past.
Problems, configurations and effects other than those described above will become apparent from the following description of the embodiments.

1 is a perspective view showing a configuration of a piano wire position detection device according to a first embodiment. FIG. FIG. 4 is a perspective view illustrating a configuration of an X-direction position detection unit. FIG. 2 is a diagram showing the arrangement of an optical detector and a slit plate. 4 is a plan view showing an arrangement state of an X-direction position detection unit and a Y-direction position detection unit. FIG. 1 is a functional block diagram of a piano wire position detection device according to a first embodiment. FIG. 1 is a plan view showing a state in which a piano wire is positioned between a light-emitting portion and a light-receiving portion of an optical detector. FIG. FIG. 13 is a diagram showing output characteristics of an optical detector at each position on a piano wire. FIG. 2 is a plan view showing a state in which a piano wire is positioned between a light-emitting portion and a light-receiving portion of each optical detector. FIG. 13 is a diagram showing output characteristics of an optical detector at each position on a piano wire. 5 is a schematic diagram illustrating state transition of an output signal of an optical detector. FIG. FIG. 4 is a plan view showing a configuration of an indicator as an example of a notification unit. FIG. 11 is a functional block diagram of a piano wire position detection device according to a second embodiment. FIG. 4 is a diagram showing an example of a vibration waveform of a piano wire.

Embodiments of the present invention will be described in detail below with reference to the drawings. In this specification and the drawings, elements having substantially the same functions or configurations are given the same reference numerals, and duplicate descriptions will be omitted.

First Embodiment
Fig. 1 is a perspective view showing the configuration of a piano wire position detection device according to the first embodiment. In Fig. 1, in order to clarify the positional relationship of each part, two directions that intersect at right angles in a horizontal plane are defined as the X direction and the Y direction, and the vertical direction that intersects at right angles to the X direction and the Y direction is defined as the Z direction. This is the same in the other figures.

As shown in FIG. 1, piano wire position detection device 10 is a device that detects the position of piano wire 12 suspended in an elevator hoistway. Piano wire 12 is hung from the top of the hoistway, which is the top of the building, by a weight attached to it, and is stretched vertically by the weight of the weight. Guide rails 14 are components that guide the movement of the car going up and down the hoistway, and are provided in a pair on both sides of the car. Guide rails 14 are steel rails that are fixed to the wall of the building facing the hoistway. Guide rails 14 are provided with an X-Z reference surface 14a and a Y-Z reference surface 14b, and when installing guide rails 14, these reference surfaces must be precisely aligned.

The position of the guide rail 14 is adjusted based on the position of the piano wire 12. Specifically, the position of the guide rail 14 is adjusted in the XY plane based on the piano wire 12, and after adjustment, the guide rail 14 is fixed to the wall of the building using a bracket (not shown). The guide rail 14 is fixed at several points in the vertical direction to the wall of the building. This allows the guide rail 14 to be installed parallel to the vertical direction.

The piano wire position detection device 10 includes an X-direction position detection unit 16, a Y-direction position detection unit 18, a current adjustment unit 20, a zone determination unit 22, a wireless communication unit 24, a power supply unit 26, and a housing 28.

(X-direction position detection unit 16)
The X-direction position detection unit 16 is a part that detects the position of the piano wire 12 in the X-direction. As shown in FIG. 2, the X-direction position detection unit 16 includes two optical detectors 161 and 162 and a slit plate 163. The two optical detectors 161 and 162 are each formed of a transmission type optical sensor. The optical detector 161 has a light emitting unit 161a and a light receiving unit 161b. The optical detector 161 is formed in a U-shape so that the light emitting unit 161a and the light receiving unit 161b face each other in the Y-direction. As a result, the optical detector 161 is configured so that the light emitted by the light emitting unit 161a is received by the light receiving unit 161b. Similarly, the optical detector 162 has a light emitting unit 162a and a light receiving unit 162b, and is formed in a U-shape so that the light emitting unit 162a and the light receiving unit 162b face each other in the Y-direction. As a result, the optical detector 162 is configured such that light emitted from the light emitting portion 162a is received by the light receiving portion 162b. The two optical detectors 161 and 162 are arranged one above the other in the vertical direction (up and down direction). One of the two optical detectors 161 and 162 corresponds to the first optical detector, and the other optical detector corresponds to the second optical detector.

The output of the optical detector 161 changes depending on the amount of light incident on the light receiving surface of the light receiving section 161b. For this reason, the current supplied to the light emitting section 161a is adjusted so that the output of the optical detector 161 is 100% when there is no obstruction between the light emitting section 161a and the light receiving section 161b, and the output of the optical detector 161 is 0% when there is an obstruction. The output of the optical detector 161 is then binarized at a threshold value of 50%, and the presence or absence of an obstruction is detected depending on whether the output of the optical detector 161 is equal to or greater than the threshold value. Examples of such optical detectors 161 include photointerrupters and fiber sensors. By using a photointerrupter for the optical detector 161, it is possible to realize a small and lightweight device. A photointerrupter is lightweight, consumes little power, and does not require a special drive circuit. This feature allows the sensor section for detecting the position of the piano wire 12 to be configured very compactly. In addition, the photointerrupter is compatible with the embedded microcomputer used in the zone determination unit 22, and the output signal can be input as is. Both the photointerrupter and the embedded microcomputer consume little power, making them battery-powered, and the entire system can be housed in a small housing 28.

The slit plate 163 is arranged so as to be located between the light emitting portion 161a and the light receiving portion 161b, and between the light emitting portion 162a and the light receiving portion 162b in the Y direction. The slit plate 163 limits the position detection range (X-direction detection width) of the piano wire 12 in each of the optical detectors 161 and 162 in the X direction, and has two slit holes 164 and 165. The slit hole 164 is arranged on the upper side of the slit plate 163 corresponding to the optical detector 161, and the slit hole 165 is arranged on the lower side of the slit plate 163 corresponding to the optical detector 162. The slit hole 164 is a hole that transmits a part of the light emitted from the light emitting portion 161a toward the light receiving portion 161b. The slit hole 165 is a hole that transmits a part of the light emitted from the light emitting portion 162a toward the light receiving portion 162b. The two slits 164 and 165 are preferably formed to have the same size and shape. The positions of the slits 164 and 165 are shifted in the X direction by a predetermined amount Δx.

3, the light receiving section 161b of the optical detector 161 is provided with a light receiving surface 161c, and the light receiving section 162b of the optical detector 162 is also provided with a light receiving surface 162c. The light receiving surface 161c is a surface that receives light emitted from the light emitting section 161a, and the light receiving surface 162c is a surface that receives light emitted from the light emitting section 162a. In contrast, the slit hole 164 is arranged to expose a part of the light receiving surface 161c of the light receiving section 161b and to block the other part. Similarly, the slit hole 165 is arranged to expose a part of the light receiving surface 162c of the light receiving section 162b and to block the other part. As a result, only light that has passed through the slit hole 164 is incident on the light receiving surface 161c, and only light that has passed through the slit hole 165 is incident on the light receiving surface 162c. For this reason, the position detection range of the piano wire 12 in the optical detector 161 (hereinafter also simply referred to as the "detection range") and the position detection range of the piano wire 12 in the optical detector 162 (hereinafter also simply referred to as the "detection range") are set to be shifted by a predetermined amount Δx in the X direction.

The position detection range of the piano wire 12 in the optical detector 161 and the position detection range of the piano wire 12 in the optical detector 162 overlap partially in the X direction. The predetermined amount Δx, which is the amount of shift between the slit holes 164 and 165, is set to be equal to or less than the diameter φd of the piano wire 12 so that the piano wire 12 overlaps both slit holes 164 and 165 at the same time when the light receiving parts 161b and 162b are viewed from the light emitting parts 161a and 162a. The width w of each of the slit holes 164 and 165 (hereinafter also referred to as the "slit width") should be set to about 1 to 2 times the diameter φd of the piano wire 12. The reason for this is as follows.

First, if the slit width w is too wide, even if the light is blocked by the piano wire 12, the light passing by the side of the piano wire 12 reaches the light receiving surfaces 161c and 162c. Therefore, the output of the optical detectors 161 and 162 when detecting the presence of the piano wire 12 cannot be sufficiently reduced. Therefore, when a threshold is set for the output of each optical detector 161 and 162 and the position of the piano wire 12 is detected, the threshold must be set higher than 50% to determine the light blocking state by the piano wire 12. Also, if the threshold is set too high, it becomes difficult to determine the level of the output signal of the optical detectors 161 and 162, and erroneous recognition is likely to occur. On the other hand, if the slit width w is too narrow, the amount of light incident on the light receiving surfaces 161c and 162c is small even when there is no obstruction. Therefore, the output of the optical detectors 161 and 162 when there is no obstruction cannot be set to 100%. Furthermore, in order to set the output of the optical detectors 161 and 162 to 100% when there is no obstruction, it is necessary to increase the current supplied to the light-emitting elements 161a and 162a to increase the amount of light emitted by the light-emitting elements 161a and 162a, which would result in inconveniences such as increased current consumption. For the above reasons, it is preferable to set the slit width w to approximately 1 to 2 times the diameter φd of the piano wire 12.

(Y-direction position detection unit 18)
The Y-direction position detection unit 18 is a section that detects the position of the piano wire 12 in the Y direction. The Y-direction position detection unit 18 is disposed below the X-direction position detection unit 16. The vertical positional relationship between the X-direction position detection unit 16 and the Y-direction position detection unit 18 may be reversed. The Y-direction position detection unit 18 includes two optical detectors 181, 182 and a slit plate 183. The Y-direction position detection unit 18 basically has the same configuration as the X-direction position detection unit 16. However, the orientations of the Y-direction position detection unit 18 and the X-direction position detection unit 16 in the horizontal plane (X-Y plane) differ by 90° as shown in FIG. 4. Specifically, the optical detectors 161 and 162 are arranged such that the light emitting parts 161a and 162a and the corresponding light receiving parts 161b and 162b face each other in the Y direction, and the optical detectors 181 and 182 are arranged such that the light emitting parts 181a and 182a and the corresponding light receiving parts 181b and 182b face each other in the X direction. The optical detectors 161 and 162 and the optical detectors 181 and 182 are arranged with appropriate shifts in the X and Y directions so that the piano wire 12 can be guided from outside the detection range of the optical detectors 161, 162, 181, and 182 into the detection range as shown by the arrow A. The slit plate 163 is arranged parallel to the X-Z plane, and the slit plate 183 is arranged parallel to the Y-Z plane. Details of the Y-direction position detection unit 18 will not be described here because they overlap with the description of the X-direction position detection unit 16 described above.

(Current Adjustment Unit 20)
The current adjustment unit 20 adjusts the current flowing to the light-emitting units 161a, 162a of the optical detectors 161, 162 and the light-emitting units 181a, 182a of the optical detectors 181, 182. The current adjustment unit 20 adjusts the current supplied to each of the light-emitting units 161a, 162a, 181a, 182a by, for example, connecting a variable resistor (described later) or a fixed resistor (not shown) in series to each of the light-emitting units 161a, 162a, 181a, 182a and changing the total resistance value. By adjusting this current adjustment unit 20, the output levels of the optical detectors 161, 162, 182, 182 can be adjusted using the light emission amounts of the light-emitting units 161a, 162a, 181a, 182a as a control parameter.

(Zone determination unit 22)
The zone determination unit 22 receives the output signals output by the optical detectors 161, 162, 181, and 182, and detects the position of the piano wire 12 in a zone based on the output signals. The output signal of the optical detector 161 is a signal output according to the amount of light received by the light receiving unit 161b, and the output signal of the optical detector 162 is a signal output according to the amount of light received by the light receiving unit 162b. Similarly, the output signal of the optical detector 181 is a signal output according to the amount of light received by the light receiving unit 181b, and the output signal of the optical detector 182 is a signal output according to the amount of light received by the light receiving unit 182b. Detecting the position of the piano wire 12 in a zone does not simply detect the presence or absence of the piano wire 12, but means detecting in which of a plurality of zones the piano wire 12 is located. In the following description, such position detection of the piano wire 12 is also referred to as zone determination. The zone determination unit 22 performs signal processing for zone determination and signal processing for outputting the result of the zone determination to the outside. Details of the signal processing for zone determination will be described later. The zone determination unit 22 can be easily realized by constructing it with an embedded microcomputer, and has a high degree of freedom in that it can be used in conjunction with other processes, etc. The zone determination unit 22 can also be constructed with a logic circuit.

(Wireless communication unit 24)
The wireless communication unit 24 is a wireless communication means for communicating with the outside using Bluetooth (registered trademark), Wi-Fi, infrared, etc. The wireless communication unit 24 is used to transmit the zone determination result by the zone determination unit 22, the output signals of the optical detectors 161, 162, 181, 182, and various statuses to an external terminal, etc. The output signals of the optical detectors 161, 162, 181, 182 are output to the outside via the zone determination unit 22. The transmission of the zone determination result by the zone determination unit 22 can be made cordless by mounting a small wireless module on the wireless communication unit 24. This makes it possible to realize a piano wire position detection device 10 that is easy to operate and does not get in the way of cords during the centering work of the guide rail 14. The wireless communication unit 24 is also used to receive control commands for the piano wire position detection device 10 from an external terminal, etc. A modularized expansion board developed for an embedded microcomputer can be used as the wireless communication unit 24.

(Power supply unit 26)
The power supply unit 26 is a power source that supplies the power required to drive the X-direction position detection unit 16 (optical detectors 161, 162), the Y-direction position detection unit 18 (optical detectors 181, 182), the current adjustment unit 20, the zone determination unit 22, and the wireless communication unit 24. The power supply unit 26 is configured, for example, with a dry cell or a rechargeable battery. The provision of this power supply unit 26 eliminates the need for a power cord, etc.

(Housing 28)
The housing 28 is a frame that contains and mounts the X-direction position detection unit 16 (optical detectors 161, 162), the Y-direction position detection unit 18 (optical detectors 181, 182), the current adjustment unit 20, the zone determination unit 22, the wireless communication unit 24, and the power supply unit 26. The housing 28 is a part of the gauge when adjusting the position of the guide rail 14 based on the position of the piano wire 12, and is therefore made of a material that is rigid and has a small thermal expansion coefficient, such as stainless steel. In addition, it is desirable to cover the outer periphery of the housing 28 that comes into contact with the piano wire 12 with a highly lubricating resin, such as polyacetal, so as not to damage the piano wire 12. The housing 28 is provided with an introduction portion 28a for introducing the piano wire 12 from outside the detection range of the optical detectors 161, 162, 181, 182 into the detection range. Providing this housing 28 makes it easier to handle the piano wire position detection device 10.

The housing 28 is removably attached to the guide rail 14 by the clip portion 30. The clip portion 30 may be one of the elements constituting the piano wire position detection device 10, or may be an element separate from the piano wire position detection device 10. The clip portion 30 is fixed to the housing 28 so that the positional relationship between the housing 28 and the clip portion 30 is constant on the X-Y plane.

The clip unit 30 has a first contact surface 30a that contacts the X-Z reference surface 14a and a second contact surface 30b that contacts the Y-Z reference surface 14b, which are two reference surfaces provided on the guide rail 14. The clip unit 30 is fixed to the guide rail 14 by the magnetic attraction of each magnet, for example, by providing a first magnet (not shown) on the first contact surface 30a and a second magnet (not shown) on the second contact surface 30b. By fixing the clip unit 30 in this manner, it is possible to suppress the floating of the first contact surface 30a relative to the X-Z reference surface 14a and the floating of the second contact surface 30b relative to the Y-Z reference surface 14b. In addition, even if the housing 28 and the clip unit 30 are released, the piano wire position detection device 10 and the clip unit 30 are held in a fixed state. Such a fixed state can also be obtained, for example, when a fixing structure using a vice is adopted. Specifically, a screw or the like is abutted against the surface of the guide rail 14 opposite the X-Z reference surface 14a, and the guide rail 14 is sandwiched between the first abutment surface 30a and the screw or the like by tightening the screw or the like.

FIG. 5 is a functional block diagram of the piano wire position detection device according to the first embodiment.
5 shows an example in which the optical detector 161 corresponds to the first optical detector and the optical detector 162 corresponds to the second optical detector, assuming that the position of the piano wire 12 in the X direction is detected by the X direction position detection unit 16. In the case where the position of the piano wire 12 in the Y direction is detected by the Y direction position detection unit 18, the optical detector 181 corresponds to the first optical detector and the optical detector 182 corresponds to the second optical detector, but the configuration for detecting the position of the piano wire 12 is basically the same as that shown in FIG. 5. In other words, the piano wire position detection device 10 has the same configuration as that shown in FIG. 5 for each of the X direction and the Y direction, which are directions in which the position of the piano wire 12 is detected. The principle of detecting the position of the piano wire 12 in the X direction is the same as that of the piano wire 12 in the Y direction. For this reason, the principle of detecting the position of the piano wire 12 in the X direction will be described below, and the description of the principle of detecting the position of the piano wire 12 in the Y direction will be omitted.

As shown in FIG. 5, the first variable resistor 31 is electrically connected to the light-emitting portion 161a of the optical detector 161, and the second variable resistor 32 is electrically connected to the light-emitting portion 162a of the optical detector 162. The first variable resistor 31 is connected in series to the light-emitting portion 161a to adjust the current flowing through the light-emitting portion 161a, and the second variable resistor 32 is connected in series to the light-emitting portion 162a to adjust the current flowing through the light-emitting portion 162a. That is, the first variable resistor 31 and the second variable resistor 32 are variable resistors that constitute the current adjustment portion 20 shown in FIG. 1. As shown in FIG. 1 above, the slit plate 163 is a member for limiting the width of the detection range of each of the optical detectors 161 and 162, and for shifting the detection range of each of the optical detectors 161 and 162 by a predetermined amount Δx in the X direction.

The output signal S1 output by the optical detector 161 and the output signal S2 output by the optical detector 162 are taken into the zone determination unit 22. The level of the output signal S1 of the optical detector 161 changes according to the amount of light received by the light receiving unit 161b, and the level of the output signal S2 of the optical detector 162 changes according to the amount of light received by the light receiving unit 162b. The level of the output signal S1 means the value of the output voltage if the optical detector 161 is a photointerrupter, for example. The same applies to the level of the output signal S2.

The zone determination unit 22 detects the position of the piano wire 12 in a zone based on the output signals S1, S2 input to the zone determination unit 22 from the optical detectors 161, 162. The selector 35 switches between outputting the signal including the determination result of the zone determination unit 22 to the outside or to the wireless communication unit 24. The output to be used can be set in advance for the selector 35. The power supply unit 26, the housing 28, and the clip unit 30 are as described above.

Next, a method for detecting the position of a piano wire using the piano wire position detection device 10 according to the first embodiment will be described. As a preferred example, a case will be described in which the amount of shift Δx in the X direction is set to the same dimension as the diameter φd of the piano wire 12, and the slit width w, which is the detection width in the X direction, is set to twice the diameter φd of the piano wire 12.

Figure 6 is a plan view showing the state in which the piano wire 12 is located between the light-emitting portion 161a and the light-receiving portion 161b of the optical detector 161. The symbols A to G in the figure indicate the positions of the piano wire 12, respectively. Meanwhile, Figure 7 is a diagram showing the output characteristics of the optical detector 161 at each position of the piano wire 12. In Figure 7, the horizontal axis indicates the position of the piano wire 12 in the X direction, the vertical axis indicates the output (%) of the optical detector 161, and the solid line indicates the output characteristics of the optical detector 161.

6, the light emitted from the light emitting portion 161a of the optical detector 161 toward the light receiving portion 161b in the direction of the arrow reaches the light receiving portion 162b through the slit hole 164 of the slit plate 163. Therefore, when the position of the piano wire 12 is detected using the optical detector 162, the light in the range of the slit width w is used as the effective light (hereinafter also referred to as "effective light") for detecting the position of the piano wire 12. In other words, the slit width w corresponds to the detection width when the position of the piano wire 12 is detected using the optical detector 161. When the piano wire 12 is located above position A in FIG. 6 with respect to the path of the effective light (hereinafter also referred to as "light path") having the same width as this slit width w, the light path 36 is not blocked by the piano wire 12, so the output of the optical detector 161 is 100%. When the piano wire 12 is displaced from position A to position C, the light path 36 is gradually blocked by the piano wire 12, so the output of the optical detector 161 gradually decreases. When the piano wire 12 is at position C, half of the width w of the optical path 36 is blocked by the piano wire 12, so the output of the optical detector 161 drops to 50%.

Meanwhile, while the piano wire 12 is displacing from position C to position E, half of the width w of the light path 36 remains blocked by the piano wire 12, so the output of the optical detector 161 remains unchanged at 50%. When the piano wire 12 displaces from position E to position G, the piano wire 12 gradually leaves the light path 36, and as a result, the amount of light received by the light receiving portion 161b increases, so the output of the optical detector 161 rises. Then, when the piano wire 12 is located below position G in Figure 6, the light path 36 is no longer blocked by the piano wire 12, so the output of the optical detector 161 becomes 100%.

In this way, the output characteristic of the optical detector 161 becomes a V-shaped characteristic due to the change in the position of the piano wire 12 in the X direction. In this output characteristic of the optical detector 161, if the threshold is set to 75%, the output of the optical detector 161 can be divided into the following two states. One is a High state (hereinafter also referred to as the "H state") in which the output of the optical detector 161 exceeds the threshold, and the other is a Low state (hereinafter also referred to as the "L state") in which the output of the optical detector 161 is equal to or lower than the threshold. As a result, when the piano wire 12 is present in the range from position B to position F, the output of the optical detector 161 becomes the L state, and when the piano wire 12 is present in any other position, the output of the optical detector 161 becomes the H state. In this way, the position of the piano wire 12 can be detected by setting a threshold value for the output of the optical detector 161 and binarizing it.

However, when the piano wire 12 is above position B in FIG. 6, or below position F in FIG. 6, the output of the optical detector 161 goes to the H state. For this reason, it is not possible to determine whether the position of the piano wire 12 is above or below the optical path 36 in FIG. 6. In other words, the position of the piano wire 12 can only be determined in one section where the output of the optical detector 161 goes to the L state.

Therefore, in the first embodiment, in order to increase the area in which the position of the piano wire 12 can be detected, two optical detectors 161, 162 are used, and a slit plate 163 is provided so that the detection ranges of the optical detectors 161, 162 are offset, thereby adopting a configuration for detecting the position of the piano wire 12. The method for detecting the position of the piano wire 12 using the two optical detectors 161, 162 is described below.

Figure 8 is a plan view showing the state in which the piano wire 12 is positioned between the light-emitting portion 161a, 162a and the light-receiving portion 161b, 162b of each of the optical detectors 161, 162. The symbols A to I in the figure indicate the positions of the piano wire 12. The optical path 36 of the effective light traveling from the light-emitting portion 161a to the light-receiving portion 161b of the optical detector 161 and the optical path 37 of the effective light traveling from the light-emitting portion 162a to the light-receiving portion 162b of the optical detector 162 are shifted by a predetermined amount Δx due to the slit holes 164, 165 of the slit plate 163. The optical paths 36 and 37 have the same width w.

Figure 9 is a diagram showing the output characteristics of the optical detectors 161 and 162 at each position on the piano wire 12. In Figure 9, the horizontal axis indicates the position of the piano wire 12 in the X direction, the vertical axis indicates the output (%) of the optical detector 161, the solid line indicates the output characteristics of the optical detector 161, and the dashed line indicates the output characteristics of the optical detector 162.

The output characteristic of the optical detector 162 is V-shaped like the output characteristic of the optical detector 161, but this V-shaped characteristic appears at a position shifted by Δx from the output characteristic of the optical detector 161. Here, the output characteristics of the two optical detectors 161 and 162 are binarized at a threshold value of 75%. Then, the state of the output signal of each of the optical detectors 161 and 162 changes as follows depending on the position of the piano wire 12.

First, in FIG. 8, when the piano wire 12 is above position B in the figure, the output signals of the optical detectors 161 and 162 are both in the H state. When the piano wire 12 is in the range from position B to position D, the output signal of the optical detector 161 is in the L state, and the output signal of the optical detector 162 is in the H state. When the piano wire 12 is in the range from position D to position F, the output signals of the optical detectors 161 and 162 are both in the L state. When the piano wire 12 is in the range from position F to position H, the output signal of the optical detector 161 is in the H state, and the output signal of the optical detector 162 is in the L state. When the piano wire 12 is below position H in FIG. 8, the output signals of the optical detectors 161 and 162 are both in the H state.

In this way, by binarizing the outputs of the optical detectors 161 and 162 at a threshold value of 75%, the state of the output signals of the optical detectors 161 and 162 changes from HH state to LH state to LL state to HL state to HH state while the piano wire 12 moves from position A to position I. In this state change, there is one section each of the LH state, the LL state, and the HL state, so the position of the piano wire 12 can be determined. However, there are two sections in the HH state, and it is not possible to determine in which section the position of the piano wire 12 is located. For this reason, the position of the piano wire 12 can be detected only in three sections where the combination of the output signals of the optical detectors 161 and 162 is the LH state, the LL state, and the HL state.

Therefore, in this embodiment, a configuration is adopted in which the position of the piano wire 12 is detected in five zones based not only on the combination of the output signals of the optical detectors 161, 162, but also on the combination of the output signals of the optical detectors 161, 162 and the state transitions of the output signals of the optical detectors 161, 162.

FIG. 10 is a schematic diagram for explaining state transitions of the output signals of the optical detectors 161 and 162. In FIG.
The circles in Fig. 10 indicate states. As shown in Fig. 10, there is an initial state (Initial) and five zone states (Zone 0, Zone 1, Zone 2, Zone 3, and Zone 4) that represent the positions of the piano wire 12. The arrows in Fig. 10 indicate the direction in which the output signals of the optical detectors 161 and 162 transition from one state to another. The subscripts attached to the arrows indicate the trigger for the transition of the states of the output signals of the optical detectors 161 and 162. Here, it is shown that the output signals of the two optical detectors 161 and 162 are the trigger.

In this embodiment, an initial state (Initial) is set when the power to the piano wire position detection device 10 is turned on (Power on). In the initial state, the state of the output signals of the optical detectors 161 and 162 is set to the HH state, that is, the same HH combination as zone 0 and zone 4. The initial state transitions to the next state when the output signals of the optical detectors 161 and 162 change to LH, LL, and HL. The reason for setting the initial state will be explained later.

As described above, zone 0 is a zone where the binarized state of the output signals of the optical detectors 161 and 162 is HH state. Similarly, zone 1 is LH state, zone 2 is LL state, zone 3 is HL state, and zone 4 is HH state. As shown in Figs. 8 and 9, the output signals of the optical detectors 161 and 162 are HH combination when the piano wire 12 is above position B in Fig. 8, i.e., in zone 0, or below position H in Fig. 8, i.e., in zone 4. The output signals of the optical detectors 161 and 162 are LH combination when the piano wire 12 is in the range from position B to position D, i.e., in zone 1, the LL combination when the piano wire 12 is in the range from position D to position F, i.e., in zone 2, and the HL combination when the piano wire 12 is in the range from position F to position H, i.e., in zone 3.

Here, both zone 0 and zone 4 are in the HH state, which is the same combination of output signals. However, the HH state in zone 0 is always a transition state from the LH state in zone 1, whereas the HH state in zone 4 is always a transition state from the HL state in zone 3. In other words, zones 0 and 4 differ in the state immediately before the state transition of the output signals of optical detectors 161 and 162 occurs. For this reason, zones 0 and 4 can be distinguished based on whether the state immediately before the state of the output signals of optical detectors 161 and 162 becomes the HH state is the LH state or the HL state.

Regarding zone 1, zone 2 and zone 3, zone 1, zone 2 and zone 3 can be individually identified based on the combination of the output signals of optical detectors 161, 162.

In view of the above, in this embodiment, in addition to the combination of the output signals of the optical detectors 161 and 162, the state transition of the output signals of the optical detectors 161 and 162 is applied to the determination of the position of the piano wire 12. As a specific means for this, the zone determination unit 22 is configured to perform the following processes: binarizing the output signals of the optical detectors 161 and 162 with a preset threshold value (75% in this embodiment); storing the state immediately before the transition when the state of the output signals of the optical detectors 161 and 162 transitions from one state to another; determining the zone in which the piano wire 12 is located based on the results of these processes; and outputting the determination result. As a result, even if part or all of the piano wire 12 is outside the detection range (optical paths 36 and 37 of the effective light) of the optical detectors 161 and 162, it is possible to detect in which direction the piano wire 12 is outside the optical paths 36 and 37 shown in FIG. 8 . Therefore, it is possible to detect the position of the piano wire 12 over a wider range.

Next, we will explain the processing performed by the zone determination unit 22.

When the device is turned on, the judgment state of the zone judgment unit 22 transitions to the initial state. In the initial state, the piano wire 12 is assumed to be outside the detection range of the optical detectors 161 and 162, and the HH state is set. The zone judgment unit 22 waits in the initial state until the state of the output signal of the optical detectors 161 and 162 becomes other than the initial state (a state other than HH). If a state other than HH is detected, the unit transitions to one of five zones representing the position of the piano wire 12 according to the state transition of the output signal between the zones, and performs zone judgment. To trigger the transition to this zone judgment, the operator pinches the piano wire 12 and passes it once through the detection range of the optical detectors 161 and 162. This releases the initial state in the zone judgment unit 22, and the subsequent zone judgment functions effectively.

When performing zone determination in the zone determination unit 22, it is not necessarily necessary to set the unit to an initial state when the device is powered on. However, to properly perform zone determination without setting the zone determination unit 22 to an initial state would complicate the processing circuitry of the zone determination unit 22. For this reason, setting the zone determination unit 22 to an initial state would simplify the processing circuitry of the zone determination unit 22.

When the zone determination unit 22 detects a state other than HH as the state of the output signal of the optical detectors 161 and 162, it cancels its own initial state. The initial state is canceled when the state of the output signal of the optical detectors 161 and 162 becomes LH, LL, or HL, which is different from the initial state (HH), as shown in FIG. 10. In addition, in order to cancel this initial state, for example, if an operator picks up the piano wire 12 and passes it through the detection range of the optical detectors 161 and 162 from the top to the bottom in FIG. 8, the state of the output signal of the optical detectors 161 and 162 changes in the order of HH → LH → LL → HL → HH. Conversely, if an operator picks up the piano wire 12 and passes it through the detection range of the optical detectors 161 and 162 from the bottom to the top in FIG. 8, the state of the output signal of the optical detectors 161 and 162 changes in the order of HH → HL → LL → LH → HH.

At that time, the zone determination unit 22 stores the state immediately before the transition of the state of the output signals of the optical detectors 161 and 162. As a specific example, when the state of the output signals of the optical detectors 161 and 162 transitions from LH to LL, the zone determination unit 22 stores the LH state, which is the state immediately before the transition to LL, and when the state transitions from HL to HH, the zone determination unit 22 stores the HL state, which is the state immediately before the transition to HH. In addition, the zone determination unit 22 re-stores the previous state every time the state of the output signals of the optical detectors 161 and 162 transitions. In other words, the "previous state" stored by the zone determination unit 22 is updated every time the state of the output signals of the optical detectors 161 and 162 transitions. This storage process is performed not only when the initial state is released, but also after the initial state is released.

After releasing the initial state, the zone determination unit 22 executes a zone determination process for detecting the position of the piano wire 12 in five zones.
First, the zone determination unit 22 determines that the piano wire 12 is in zone 1 if the state of the output signals of the optical detectors 161, 162 is LH, determines that the piano wire 12 is in zone 2 if the state is LL, and determines that the piano wire 12 is in zone 3 if the state is HL. Furthermore, if the state of the output signals of the optical detectors 161, 162 is HH, the zone determination unit 22 checks the state immediately before the transition to the HH state. Then, if the state immediately before the transition to the HH state is LH, the zone determination unit 22 determines that the piano wire 12 is in zone 0, and if the state immediately before is HL, determines that the piano wire 12 is in zone 4. In this way, the zone determination unit 22 can detect the position of the piano wire 12 in five zones.

Next, a method for centering the guide rail 14 using the piano wire position detection device 10 according to this embodiment will be described.
First, an operator assembles piano wire position detection device 10 with high precision. In doing so, the operator uses housing 28 of piano wire position detection device 10 as part of a gauge and assembles the device while controlling with high precision the distance from clip portion 30 to the detection position of piano wire 12. Fine adjustment of the distance can be performed by adjusting the positions of slit plates 163 and 183. In this case, the operator adjusts the distance from clip portion 30 to the detection position of piano wire 12 by outputting output signals of optical detectors 161, 162, 181, and 182 to an external device or the like for monitoring, so that the position where piano wire 12 should be aligned is the position of zone 2.

Next, the worker fixes the piano wire position detection device 10, for which the above-mentioned distance adjustment has been completed, to the guide rail 14 using the clip portion 30. At this time, the worker brings the first abutment surface 30a of the clip portion 30 into contact (close contact) with the X-Z reference surface 14a of the guide rail 14, and brings the second abutment surface 30b into contact (close contact) with the Y-Z reference surface 14b. At this point, the guide rail 14 has not been centered, so the piano wire 12 is located outside the detection range of the optical detectors 161, 162 and the detection range of the optical detectors 181, 182.

Next, the operator grasps the piano wire 12 with his/her hand and introduces it through the introduction portion 28a of the housing 28, while passing the piano wire 12 once through the detection ranges of the optical detectors 161, 162 and the detection ranges of the optical detectors 181, 182 so that the piano wire 12 crosses these detection ranges. This causes the zone determination unit 22 to cancel its own initial state and then start the zone determination process. The details of the zone determination process are as described above.

The result of the zone determination process is output from the zone determination unit 22 to the outside via the selector 35. There are various output methods. For example, by using the switching function of the selector 35, it is possible to select a method of transmitting to an external device via a wire or a method of transmitting to the outside wirelessly via the wireless communication unit 24. In addition, as shown in FIG. 11, for example, an indicator 39 having a plurality of LED lamps 38 may be provided on the upper surface of the housing 28 so that the worker can recognize the position of the piano wire 12 determined by the zone determination unit 22. The indicator 39 corresponds to a notification unit that notifies the worker, etc. of the position of the piano wire 12 detected by the zone determination unit 22. The indicator 39 is composed of LED lamps 38 that form a 5×5 matrix. The lighting positions of the LED lamps 38 in the indicator 39 are switched depending on the result of the zone determination process by the zone determination unit 22. The switching of the lighting positions may be performed by the zone determination unit 22 or by a lighting control unit (not shown).

If zone 0 in the X direction is the lower part of FIG. 11, zone 4 in the X direction is the upper part of FIG. 11, zone 0 in the Y direction is the left part of FIG. 11, and zone 4 in the Y direction is the right part of FIG. 11, the lighting position of LED lamp 38 in indicator 39 is controlled as follows according to the result of the zone determination process.

For example, if the result of the zone determination process indicates that the position of the piano wire 12 in the X direction is zone 2 and that the position of the piano wire 12 in the Y direction is also zone 2, then the LED lamp 38a located in the center of the matrix is lit. On the other hand, if the position of the piano wire 12 in the X direction is zone 3 and that the position of the piano wire 12 in the Y direction is zone 1, then the LED lamp 38b located fourth from the bottom and second from the left in the matrix is lit. By displaying the position of the piano wire 12 with the indicator 39 in this way, the worker can recognize the position of the piano wire 12 by looking at the positions of the lit LED lamps 38.

If the lighting position of the LED lamp 38 in the indicator 39 is shifted from the center of the matrix, the worker shifts the position of the guide rail 14 so that the lighting position of the LED lamp 38 approaches the center of the matrix. Then, finally, the position of the guide rail 14 is adjusted so that only the LED lamp 38a in the indicator 39 is lit. This completes the centering of the guide rail 14.

The means for notifying the worker of the position of the piano wire 12 may be a display other than the indicator 39, or may be a sound emitted by a buzzer, speaker, etc. When notifying the worker of the position of the piano wire 12, the length, frequency, number of times, etc. of the sound may be changed depending on the result of the zone determination process to allow the worker to recognize the position of the piano wire 12.

As described above, the piano wire position detection device 10 according to the first embodiment includes a zone determination unit 22 that detects the position of the piano wire 12 in the X direction in five zones based on the combination of output signals from the optical detectors 161 and 162 and the state transitions of the output signals from the optical detectors 161 and 162. Also, with respect to the position of the piano wire 12 in the Y direction, a zone determination unit 22 that detects the position of the piano wire 12 in five zones based on the combination of output signals from the optical detectors 181 and 182 and the state transitions of the output signals from the optical detectors 181 and 182. This allows the position of the piano wire 12 to be detected over a wider detection range than ever before.

In the first embodiment, the X-direction position detection unit 16 is configured such that the position detection range of the optical detector 161 is offset from the position detection range of the optical detector 162 by Δx (see FIGS. 2 and 3), which is the same dimension as the diameter φd of the piano wire 12 in the X-direction. Similarly, the Y-direction position detection unit 18 is configured such that the position detection range of the optical detector 181 is offset from the position detection range of the optical detector 182 by Δy (not shown), which is the same dimension as the diameter φd of the piano wire 12 in the Y-direction. This allows the output signal states of the optical detectors 161 and 162 and the output signal states of the optical detectors 181 and 182 to be reliably switched according to the five zones in both the X and Y directions.

In the first embodiment, the X-direction position detection unit 16 is configured such that the position detection range of the optical detector 161 and the position detection range of the optical detector 162 each have a detection width twice the diameter φd of the piano wire 12 in the X-direction. Similarly, the Y-direction position detection unit 18 is configured such that the position detection range of the optical detector 181 and the position detection range of the optical detector 182 each have a detection width twice the diameter φd of the piano wire 12 in the Y-direction. This allows the X-direction position detection unit 16 to sufficiently reduce the output of the optical detectors 161 and 162 when the piano wire 12 is present in the position detection ranges of the optical detectors 161 and 162. Furthermore, the output of the optical detectors 161 and 162 can be set to 100% when there is no obstruction in the position detection ranges of the optical detectors 161 and 162 without increasing the current supplied to the light-emitting units 161a and 162a. This is also true for the Y-direction position detection unit 18.

In addition, the first embodiment has a first variable resistor 31 connected in series to the light-emitting portion 161a of the optical detector 161, and a second variable resistor 32 connected in series to the light-emitting portion 162a of the optical detector 162. This allows the current supplied to the light-emitting portions 161a and 162a to be easily adjusted by the corresponding variable resistors 31 and 32.

Second Embodiment
FIG. 12 is a functional block diagram of a piano wire position detection device according to the second embodiment.
In the second embodiment, the same components as those in the first embodiment described above are denoted by the same reference numerals, and duplicated explanations will be omitted.
12, piano wire position detection device 10A differs from piano wire position detection device 10 according to the first embodiment in that it includes a second zone determination unit 42. Based on the determination results of zone determination unit 22, second zone determination unit 42 measures the residence time of piano wire 12 in five zones, and detects the position of piano wire 12 in each zone based on the measurement results. This will be described in detail below.

The piano wire 12 is hung from the top of the elevator shaft by a weight, but there are cases where a worker touches the piano wire 12, the building vibrates, or the wind causes the piano wire 12 to vibrate. In such cases, the vibration of the piano wire 12 does not decay easily, and it may take several minutes for the vibration to subside. In such cases, in order for the zone determination unit 22 to accurately detect the position of the piano wire 12, it is necessary to wait until the vibration of the piano wire 12 subsides, and during that time, the centering work of the guide rail 14 must be suspended.

In the second embodiment, in order to avoid interrupting the centering operation of the guide rail 14, when the piano wire 12 is vibrating, the vibration center of the vibrating piano wire 12 is found using the zone determination result by the zone determination unit 22. Since the vibration of the piano wire 12 is a string vibration, the vibration waveform can be considered to be a sine wave as shown in Figure 13. In Figure 13, the horizontal axis indicates the phase angle of the vibration of the piano wire 12, and the horizontal axis indicates the position of the piano wire 12.

A sine wave has the property that the time required for the upper amplitude is the same as the time required for the lower amplitude. For this reason, for example, if the center of the vibration amplitude of the piano wire 12 is in zone 2, the residence time t01 during which the piano wire 12 stays in zones 0 and 1 is approximately the same as the residence time t34 during which the piano wire 12 stays in zones 3 and 4. In contrast, if the center of the vibration amplitude of the piano wire 12 is biased toward zone 0 or zone 4, a difference will occur between the residence time t01 and the residence time t34 depending on the degree of bias. For example, in FIG. 13, the center P2 of the vibration amplitude of the piano wire 12 is biased toward zone 4 with respect to the center P1 of the five zones, so the residence time t34 is longer than the residence time t01. Therefore, the second zone determination unit 42 measures the residence time t01 and residence time t34 when the piano wire 12 is vibrating, and detects in which of the five zones the center of the vibration amplitude of the piano wire 12 is located based on the difference between the residence times t01 and t34 based on the measurement results. Specific examples are given below.

If the difference between the stay times t01 and t34 divided by the combined value of the stay times t01 and t34 is less than ±5%, the second zone determination unit 42 determines that the center of the vibration amplitude of the piano wire 12 is in zone 2. Furthermore, if the stay time t01 is longer than the stay time t34 and the time difference (t01-t34) divided by the combined value of the stay times t01 and t34 is 5% or more but less than 10%, the second zone determination unit 42 determines that the center of the vibration amplitude of the piano wire 12 is in zone 1, and if it is 10% or more, it determines that it is in zone 0. Furthermore, if the residence time t34 is longer than the residence time t01 and the time difference (t34-t01) divided by the combined value of the residence times t01 and t34 is 5% or more and less than 10%, the second zone determination unit 42 determines that the center of the vibration amplitude of the piano wire 12 is in zone 3, and if it is 10% or more, it determines that it is in zone 4. Note that, based on the nature of the sine wave described above, the zone in which the center of the vibration amplitude of the piano wire 12 is present coincides with the zone in which the non-vibrating piano wire 12 is present.

As described above, the piano wire position detection device 10A according to the second embodiment is equipped with a second zone determination unit 42 that measures the residence time of the piano wire 12 in five zones based on the determination results of the zone determination unit 22, and detects the position of the piano wire 12 in the zone based on this measurement result. As a result, even if the piano wire 12 is vibrating, the position of the piano wire 12 can be accurately detected by the second zone determination unit 42 without waiting for the vibration to subside. Therefore, the centering work of the guide rail 14 can be performed efficiently.

<Modifications, etc.>
The present invention is not limited to the above-described embodiment, but includes various modified examples. For example, the above-described embodiment has been described in detail to facilitate understanding of the contents of the present invention, but the present invention is not necessarily limited to having all the configurations described in the above-described embodiment. It is also possible to replace a part of the configuration of one embodiment with the configuration of another embodiment. It is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to delete a part of the configuration of each embodiment, add another configuration, or replace it with another configuration.

For example, the piano wire position detection device 10, 10A can be used not only for centering the guide rail 14, but also for centering other installation components such as thresholds.

10, 10A... piano wire position detection device, 12... piano wire, 14... guide rail, 16... X-direction position detection section, 18... Y-direction position detection section, 22... zone determination section, 31... first variable resistor, 32... second variable resistor, 42... second zone determination section, 161, 162, 181, 182... optical detector, 161a, 162a, 181a, 182a... light emitting section, 161b, 162b, 181b, 182b... light receiving section

Claims (5)

A piano wire position detection device for detecting the position of a piano wire suspended in an elevator hoistway, comprising:
a first optical detector having a first light emitting portion and a first light receiving portion;
a second optical detector having a second light emitting portion and a second light receiving portion;
a zone determination unit that detects the position of the piano wire in a zone based on a first output signal output by the first optical detector and a second output signal output by the second optical detector;
Equipped with
the first optical detector and the second optical detector are arranged such that a position detection range of the piano wire in the first optical detector partially overlaps with a position detection range of the piano wire in the second optical detector;
the zone determination unit detects the position of the piano wire in five zones based on a combination of the first output signal and the second output signal and on state transitions of the first output signal and the second output signal ;
The zone determination unit stores a state immediately before the state of the first output signal and the state of the second output signal transitions.
Piano wire position detection device. A piano wire position detection device for detecting the position of a piano wire suspended in an elevator hoistway, comprising:
a first optical detector having a first light emitting portion and a first light receiving portion;
a second optical detector having a second light emitting portion and a second light receiving portion;
a zone determination unit that detects the position of the piano wire in a zone based on a first output signal output by the first optical detector and a second output signal output by the second optical detector;
Equipped with
the first optical detector and the second optical detector are arranged such that a position detection range of the piano wire in the first optical detector partially overlaps with a position detection range of the piano wire in the second optical detector;
the zone determination unit detects the position of the piano wire in five zones based on a combination of the first output signal and the second output signal and on state transitions of the first output signal and the second output signal;
The zone determination unit is set to an initial state when the device is powered on, and the initial state is released when the states of the first output signal and the second output signal become states other than the initial state.
Piano wire position detection device. A piano wire position detection device for detecting the position of a piano wire suspended in an elevator hoistway, comprising:
a first optical detector having a first light emitting portion and a first light receiving portion;
a second optical detector having a second light emitting portion and a second light receiving portion;
a zone determination unit that detects the position of the piano wire in a zone based on a first output signal output by the first optical detector and a second output signal output by the second optical detector;
Equipped with
the first optical detector and the second optical detector are arranged such that a position detection range of the piano wire in the first optical detector partially overlaps with a position detection range of the piano wire in the second optical detector;
the zone determination unit detects the position of the piano wire in five zones based on a combination of the first output signal and the second output signal and on state transitions of the first output signal and the second output signal;
The position detection range of the first optical detector and the position detection range of the second optical detector are shifted from each other by the same dimension as the diameter of the piano wire in the position detection direction of the piano wire.
Piano wire position detection device. A piano wire position detection device for detecting the position of a piano wire suspended in an elevator hoistway, comprising:
a first optical detector having a first light emitting portion and a first light receiving portion;
a second optical detector having a second light emitting portion and a second light receiving portion;
a zone determination unit that detects the position of the piano wire in a zone based on a first output signal output by the first optical detector and a second output signal output by the second optical detector;
Equipped with
the first optical detector and the second optical detector are arranged such that a position detection range of the piano wire in the first optical detector partially overlaps with a position detection range of the piano wire in the second optical detector;
the zone determination unit detects the position of the piano wire in five zones based on a combination of the first output signal and the second output signal and on state transitions of the first output signal and the second output signal;
a current adjusting unit that adjusts a current flowing through the first light emitting unit and the second light emitting unit;
The current adjusting section is configured by a variable resistor connected in series to the first light emitting section and the second light emitting section.
Piano wire position detection device. A piano wire position detection device for detecting the position of a piano wire suspended in an elevator hoistway, comprising:
a first optical detector having a first light emitting portion and a first light receiving portion;
a second optical detector having a second light emitting portion and a second light receiving portion;
a zone determination unit that detects the position of the piano wire in a zone based on a first output signal output by the first optical detector and a second output signal output by the second optical detector;
Equipped with
the first optical detector and the second optical detector are arranged such that a position detection range of the piano wire in the first optical detector partially overlaps with a position detection range of the piano wire in the second optical detector;
the zone determination unit detects the position of the piano wire in five zones based on a combination of the first output signal and the second output signal and on state transitions of the first output signal and the second output signal;
The piano wire may be moved to a different zone from the five zones based on the result of the determination by the zone determination unit.
Piano wire position detection device.

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