JP2018070338A - Elevator device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the number of photoelectronic sensors in an elevator device in which photoelectronic sensors are provided in a car 2 and plates facing the photoelectronic sensors are provided in upper and lower end parts of a hoistway 1.SOLUTION: An encoder 22 is provided in a governor 15. A plate includes a gap part and shielding parts in which the gap part is sandwiched from above and below with the shielding parts. One of the shielding parts has a vertical length that is a basic unit length. The other shielding part has a vertical length that is multiple of the basic unit length. There are plural kinds of plates in which the other shielding parts have different vertical lengths. The respective plates are disposed in the hoistway 1 such that the plates having the other shielding parts with shorter vertical length are positioned at the sides of the end parts of the hoistway 1. In each plate, the one shielding part is disposed to face a center side of the hoistway 1. Accordingly, the position of the car 2 is detected by the encoder 22 and one photoelectronic sensor 23.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an apparatus for detecting the position of an elevator car traveling in a hoistway, and more particularly to an apparatus for detecting the position of a car at the upper and lower ends of the hoistway, for example, an ETS (Terminal Floor Forced Deceleration Device).

As a means for detecting the position of the elevator car traveling in the hoistway, there is a configuration in which a number of position sensors are arranged in the hoistway and a cam for operating the position sensor is installed in the car. In this technique, the position of the car is detected by turning the position sensor on and off each time the car passes the position of the position sensor.
However, this apparatus increases the number of position sensors and increases the number of position sensor wiring cables.

  Therefore, as a means for solving this problem, a photoelectric sensor is provided in the cage, and a shield plate (plate) that blocks the optical axis of the photoelectric sensor is arranged in the hoistway (for example, see Patent Document 1). Yes.

  This apparatus will be described with reference to the drawings. FIG. 13 is a view showing the arrangement of the plates in the hoistway, FIG. 14 is a view showing the main part of the car ceiling, FIG. 15 is a detailed explanatory view of the plates, and FIG. 16 is an explanatory view of the positional relationship of each plate.

In the figure, 1 is a hoistway in which the car 2 moves up and down, A1 to A6 are A phase plates arranged in the hoistway 1, similarly B1 to B6 are B phase plates, and Z1 to Z6 are Z phase plates.
4 is a photoelectric sensor installed in the upper part of the car 2, the photoelectric sensor 4a for the A phase plates A1 to A6, the photoelectric sensor 4b for the B phase plates B1 to B6, and the photoelectric sensor 4z for the Z phase plates Z1 to Z6. It has. Reference numeral 5 denotes a pair of guide rails for guiding the raising and lowering of the car 2.

  As shown in FIG. 15, a gap G is formed in the A-phase and B-phase plates, and the upper and lower portions are shielding portions S that are plate bodies. The shielding portion S blocks the optical axis of the photoelectric sensor 4, and the gap portion G can pass the optical axis of the photoelectric sensor 4, and both are alternately arranged in the vertical direction, and the length of the shielding portion S and the gap portion G is The length L0 is the same.

As shown in FIG. 13, in the upper part of the hoistway 1, in order from the top, three plates A1 with a gap G, two plates A2 with a gap G, and a plate A3 with one gap G are arranged. Has been.
On the other hand, in the lower part of the hoistway 1, in order from the top, two plates A4 with a gap G, three plates A5 with a gap G, and four plates A6 with a gap G are arranged. As described above, the closer to the upper and lower ends of the hoistway 1, the larger the number of the gaps G is arranged, and the lower plate has one more gap than the upper part.

  The B-phase plates B1 to B6 are also configured and arranged in the same manner as the A-phase plates A1 to A6. However, at the upper part of the hoistway 1, they are arranged lower than the A-phase plate by L0 / 2, and the hoistway In the lower part of 1, it is arranged 3L0 / 2 higher than the A-phase plate.

The Z-phase plates Z1 to Z6 are plates having no gaps, and are longer than the corresponding A-phase and B-phase plates. The upper ends thereof extend upward from the corresponding A-phase and B-phase plates, and the lower ends thereof are the corresponding A-phases. , Extends downward from the B-phase plate.
When the photoelectric sensor 4 detects the upper end or the lower end (edge) of the shielding portion S, it generates a pulse signal, and performs car position detection based on this pulse signal.

  Further, the hoistway 1 is divided into a number of sections with reference to the upper and lower ends of the Z-phase plates Z1 to Z6.

  As shown in FIG. 13, section 1 extends from the upper end of the plate Z1 to the upper end of the hoistway 1, section 2 extends from the upper end of the plate Z1 to the upper end of the plate Z2, and so on. Section 7 is set up to the lower end. Further, the section 11 extends from the lower end of the plate Z1 to the upper end of the hoistway 1, the section 12 extends from the lower end of the plate Z1 to the lower end of the plate Z2, and the section 17 extends from the lower end of the plate Z6 to the lower end of the hoistway 1. It is said.

  These sections also show the direction of travel of the car 2. That is, when it is determined that the car 2 that has passed through each Z-phase plate has reached the sections 1 to 6, the car 2 is rising, and the car 2 that has passed through each Z-phase plate has reached the sections 12 to 17. When it is determined that the car 2 is descending.

  The operation of this prior art will be briefly described. FIG. 16 is a detailed view of the plate A3, B3, Z3 portion of FIG. 13, and the case where the car 2 is raised will be described.

When the car 2 rises and reaches a1, the photoelectric sensor 4z detects the Z-phase plate Z3. When the car 2 further rises and reaches a2, the photoelectric sensor 4b detects the shielding part S of the B-phase plate B3. When the car 2 further rises and reaches a3, the photoelectric sensor 4a detects the shielding part S of the A-phase plate A3. When the car 2 further rises and reaches a4, the photoelectric sensor 4b ends the detection of the shielding part S of the B-phase plate B3 and detects the gap part G.
Similarly, the photoelectric sensor 4 sequentially detects the boundary between the gap G and the shielding part S of each phase plate, and the car 2 rises.

The plate group consisting of one A, B, and Z phase plate arranged in the hoistway 1 is different in the length of each phase plate, the number of gaps G and shielding portions S, and the installation position of each phase plate. The amount is different.
Therefore, although detailed description is omitted, the cage 2 has passed through which plate group in which direction by sequentially detecting the boundary portion between the gap portion G and the shielding portion S of each phase plate by the photoelectric sensor 4. Can be detected.
Thereby, it is possible to detect which section the car 2 is moving up and down.

Japanese Patent Laid-Open No. 2006-141537

The prior art requires photoelectric sensors for three types of plates, A phase, B phase, and Z phase, and three types of plates, A phase, B phase, and Z phase. In addition, if the system is duplicated for the purpose of improving safety, six light sensors are required, and there is a problem that it may be difficult to install in a car.
The present invention aims to solve the above-described problems.

  The present invention provides an encoder for detecting an elevator car movement amount and a driving direction, a plurality of plates arranged in a hoistway and having a gap portion and a shielding portion, and installed in the car so as to face the plate. And a sensor for detecting a gap portion and a shielding portion of the plate, wherein the plate has a shape in which the shielding portion sandwiches the gap portion from above and below, and one of the shielding portions is a shielding portion. The vertical length is the basic unit length, and the other shielding portion has a vertical length that is a multiple of the basic unit length, and the other shielding portion has a different vertical length. There is a type, and the configuration is such that the position of the car is specified by the vertical length of the gap and the shielding part of the plate detected by the encoder and the sensor, and the operation direction of the car. thing A.

  In the present invention, the vertical lengths of the gap portion and the shielding portion of the plate are obtained from the signal from the encoder and the sensor that detects whether or not the car is currently traveling on the shielding portion of the plate. It is the structure which detects by a signal.

Further, in the present invention, the plates are arranged in the hoistway so that the plate having a short length in the vertical direction of the other shielding part comes to the end side of the hoistway. One of the shielding portions is arranged so as to face the center side of the hoistway.
The sensor detects upper and lower ends of the shielding portion. Further, the sensor is a photoelectric sensor.

  According to the present invention, the number of sensors installed in the car can be reduced.

It is the schematic which shows the whole structure by embodiment of this invention. It is a figure which shows arrangement | positioning of the plate in the hoistway by embodiment of this invention. It is detail explanatory drawing of the plate by embodiment of this invention. It is a figure which shows the principal part of the cage | basket ceiling part by embodiment of this invention. It is a block diagram which shows the logic of the cage position detection means by embodiment of this invention. It is a flowchart which shows the operation | movement of the cage position detection by embodiment of this invention. It is a flowchart which shows the operation | movement of the cage position detection by embodiment of this invention. It is a flowchart which shows the operation | movement of the cage position detection by embodiment of this invention. It is a flowchart which shows the operation | movement of the cage position detection by embodiment of this invention. It is a flowchart which shows the operation | movement of the cage position detection by embodiment of this invention. It is a flowchart which shows the operation | movement of the cage position detection by embodiment of this invention. It is a flowchart which shows the operation | movement of the cage position detection by embodiment of this invention. It is a figure which shows arrangement | positioning of the plate in the conventional hoistway. It is a figure which shows the principal part of the conventional cage | basket ceiling part. It is detail explanatory drawing of the conventional plate. It is positional relationship explanatory drawing of each conventional plate.

  Embodiments of the present invention will be described with reference to the drawings. 1 is a schematic diagram showing the overall configuration of the present embodiment, FIG. 2 is a diagram showing the arrangement of plates in a hoistway, FIG. 3 is a detailed explanatory diagram of the plates, and FIG. 4 is a diagram showing the main part of a car ceiling. FIG. 5 is a block diagram showing the logic of the car position detecting means, and FIGS. 6 to 12 are flowcharts showing the car position detecting operation.

  In FIG. 1, reference numeral 10 denotes a main rope having one end connected to the car 2, wound around a hoisting machine 12 and a deflector 13 disposed in the machine room 11, and the other end connected to a counterweight 14. . 15 is a governor disposed in the machine room 11, 16 is a tension pulley disposed in the lower part of the hoistway 1, 17 is a governor rope wound around the governor 15 and the tension pulley 16, and an intermediate portion is connected to the car 2. Has been.

Reference numeral 20 denotes a control device disposed in the machine room 11, and reference numeral 21 denotes a traveling cable for exchanging signals and electric power between the car 2 and the control device 20. An encoder 22 provided in the governor 15 outputs an A-phase signal and a B-phase signal to the control device 20 according to the amount of rotation, as in a general incremental encoder. U1 to U3 and D1 to D3 are plates arranged in the hoistway 1, and 23 is a photoelectric sensor installed on the upper part of the car 2, which detects the plates U1 to U3 and D1 to D3.

Each plate U1-U3 and D1-D3 are arrange | positioned as shown in FIG. 2, The detail is as showing in FIG. As shown in FIG. 3, each plate is provided with one gap G, and the upper and lower portions are shielding portions S (Sa, Sb) which are plate bodies. As in the conventional case, the shielding portion S blocks the optical axis of the photoelectric sensor 23, and the gap portion G can pass the optical axis of the photoelectric sensor 23.
The length of the gap G and the length of the one shielding portion Sa are both L, and in the present embodiment, this L is the basic unit length. This basic unit length L [mm] is expressed by Equation (1).

  As shown in FIG. 2, each plate is arranged so that the shielding portion Sa having a basic unit length L is directed toward the center of the hoistway 1. This shielding part Sa is used to determine whether the plate is arranged at the upper part or the lower part of the hoistway 1, and is here referred to as an installation position judging shielding part Sa.

  The length of the other shielding part Sb differs depending on the plate. For example, the first plate U1, D1 in FIG. 3 has a length of 2L, and similarly, the second plate U2, D2 has a length of 3L, and the third plate U3, D3 has a long length. Is 4L. That is, the length is (the number of plate steps + 1) × L. Here, it is referred to as a step number judging shielding portion Sb.

Further, as in the prior art, the hoistway 1 is divided into a number of sections with reference to the upper and lower ends of each plate. However, in this embodiment, in order to distinguish the gap G having the basic unit length L from the space after passing through the plate, the car 2 moves by 2L or more, which is twice the basic unit length L, after passing through the plate. As a result, the section is updated.

  Accordingly, as shown in FIG. 2, the section ZU1 extends from 2L above the upper end of the plate U1 to the upper end of the hoistway 1, the section ZU2 extends from 2L above the upper end of the plate U1 to 2L above the upper end of the plate U2, and so on. Thus, the section ZD1 extends from 2L above the upper end of the plate D1 to the lower end of the hoistway 1.

  Further, from the lower end of the plate U1 to 2Z below the upper end of the hoistway 1, the zone ZU11, from 2L below the lower end of the plate U1 to 2L below the lower end of the plate U2, the zone ZU12, and so on, from the lower end of the plate D1. The zone ZD11 extends from 2L below to the lower end of the hoistway 1.

  In FIG. 5, reference numeral 30 denotes an encoder processing unit that determines A phase advance / B phase advance from the A phase and B phase signals 22 a from the encoder 22, and increases / decreases an internal counter. It is assumed that the signal 22a of the encoder 22 increases when the car 2 is raised and decreases when the car 2 is lowered.

31 is a direction determination unit that determines the operation direction (up or down) of the car 2 from the count value CNT from the encoder processing unit 30, and 32 is from the count value CNT from the encoder processing unit 30 and the signal 23a from the photoelectric sensor 23. This is a shielding part length measuring unit that monitors the input state of the signal 23a and specifies the length of the shielding part S.
This signal 23a will be described below assuming that the optical axis of the photoelectric sensor 23 is low when the optical axis of the photoelectric sensor 23 is shielded by the shielding part S of the plate, and is high when the optical axis is not blocked.

33, from the driving direction signal UP / DN from the direction determining unit 31 and the shielding unit length signal ΔCNT from the shielding unit length measuring unit 32, the identification of the plate through which the car 2 has passed and the position of the car 2 are determined. 2 is a car position section determination unit that outputs a car position signal 33a indicating a section in which 2 exists.
5 may be arranged in the control device 20 of FIG. 1 or may be arranged in other places such as on the car 2.

  As described above, in the present embodiment, the driving direction of the car 2 is always determined by the signal 22a of the encoder 22. Further, the length of the shielding portion S is determined by measuring the length of the section where the signal 23a of the photoelectric sensor 23 is shielded using the signal 22a of the encoder 22. Whether the car 2 is at the upper part or the lower part of the hoistway 1 is determined by providing an installation position determining shielding part Sa. Further, the position of the car 2 is determined in which section the car 2 is present from the above determination.

  Next, the operation of the present embodiment will be described using the flowcharts of FIGS. 5 and 6 to 12.

  FIG. 6 shows the initial setting when the power is turned on. In FIG. 6, Nmax is the number of plate stages, and in the case of FIG. 2, the plates are arranged in three stages above and below, so Nmax = 3. . SS is a start value that is a count value when the photoelectric sensor 23 starts detecting the shielding portion S, SE is an end value that is a count value when the photoelectric sensor 23 finishes detecting the shielding portion S, and the car 2 is It is assumed that it is in the section ZM in the initial setting.

  The operation direction of the car 2 is determined by increasing or decreasing the signal 22a of the encoder 22. FIG. 7 is a flowchart of processing in the direction determination unit 31. Here, a case where the count value CNT increases is an up direction, and a case where the count value CNT decreases is a down direction. The operation direction of the car 2 is determined by the process of FIG.

Next, FIG. 8 is a flowchart for monitoring the input state (sensor input state) of the signal 23a from the photoelectric sensor 23 in the processing in the shielding portion length measuring unit 32.
First, when the process is started (step S10), when the signal 22a of the encoder 22 is input and the previous sensor input (the signal 23a from the photoelectric sensor 23) is High, the process proceeds to step S12. A case where the previous sensor input is Low will be described with a specific example described later.

  If the optical axis of the photoelectric sensor 23 does not detect the shielding part S of the plate when the power is turned on, the current sensor input becomes High (step S12). If the optical axis of the photoelectric sensor 23 detects the shielding part S of the plate when the power is turned on, the current sensor input becomes Low. Note that the previous sensor input at power-on is set to High.

Further, since the initial value of the end value SE is 0 and the count value CNT increases or decreases, the absolute value of the difference between the count value CNT and the end value SE increases.
When the absolute value is 2L or less, NO is determined in step S13, and the process proceeds to step S17 and ends (step S18). If the absolute value is greater than 2L, YES is determined in step S13, and the process proceeds to step S14.
Here, since the initial value of the required zone update flag is OFF, in the first process, it is determined to be OFF in step S14, the process proceeds to steps S17 and S18, and the process is terminated.

When the car 2 further moves and the photoelectric sensor 23 detects the shielding part S of the plate, the optical axis of the photoelectric sensor 23 is blocked and the signal 23a becomes Low. In S12, it is determined as Low. As already described, this is the same as when the optical axis of the photoelectric sensor 23 detects the shielding part S of the plate when the power is turned on.
Accordingly, the process proceeds to step S19, and the count value CNT at that time is taken as the start value SS. Furthermore, in step S20, the zone update flag is turned ON, the process proceeds to steps S17 and S18, and the process is terminated.

  Next, when the car 2 continues to move and the photoelectric sensor 23 continues to detect the shielding portion S, the signal 23a continues to be Low, and is determined to be Low in Step S11, and the process proceeds to Step S21. Since it is also determined as Low in step S21, the process proceeds to steps S17 and S18 and the process is terminated.

  Further, when the car 2 moves and the photoelectric sensor 23 finishes detecting the shielding portion S, the signal 23a becomes High. Therefore, when it is determined as Low in Step S11 and the process proceeds to Step S21, it is determined as High in Step S21 and the process proceeds to Step S22.

  In step S22, the count value CNT at that time is taken in as the end value SE. Further, in step S23, the absolute value of the difference between the end value SE and the start value SS is taken in as a shielding part length signal ΔCNT. Next, in step S24, the shielding part passage flag is turned ON, the process proceeds to steps S17 and S18, and the process is terminated.

Next, when the car 2 moves and the photoelectric sensor 23 continues non-detection of the shielding part S, the signal 23a continues to be high, and both are determined to be high in step S11 and step S12, and step S13. Migrate to
In this step S13, when the absolute value of the difference between the count value CNT and the end value SE at the present time is 2L or less, NO is determined in step S13, the process proceeds to steps S17 and S18, and the process is terminated.

When the car 2 further moves and the absolute value of the difference between the count value CNT and the end value SE at the present time becomes larger than 2L, YES is determined in step S13, and the process proceeds to step S14. Here, since the zone update flag is already ON in step S20, the process proceeds to step S15, the driving direction is determined from the result of the flowchart of FIG. 7, the process proceeds to step S16, and the plate passage flag is set. The process is turned on, and the process proceeds to steps S17 and S18.
This indicates that the car 2 has passed through the plate and has moved away from the plate by 2L or more.

In addition, when the car 2 moves a little and detects the shielding part S again, that is, when the shielding part S is detected before the absolute value of the difference between the count value CNT and the end value SE at the current time exceeds 2L, Step S11 is judged as High and Step S12 is judged as Low, and Steps S19 and S20 are executed again. Thereafter, the process up to the end of detection of the shielding part S is the same as described above.
This indicates that the car 2 passes through the shielding part S and enters the gap G, and further passes through the gap G to detect the next shielding part S.

Next, the process of specifying the length of the shielding part among the processes in the shielding part length measuring unit 32 will be described with reference to the flowchart of FIG.
First, when the process is started (step S30), the state of the shielding part passage flag is determined in step S31. If the shielding part passage flag remains at the initial setting (OFF), the process proceeds to step S36 and the process is terminated. If the shielding part passage flag is set to ON in step S24 of FIG. 8, it will transfer to step S32 and will determine the length of shielding part length signal (DELTA) CNT.

  Here, the shielding part length signal ΔCNT is obtained by counting the signal 22a from the encoder 22, and its value is proportional to the length (the moving distance of the car 2). Therefore, the shielding part length signal ΔCNT and the basic unit length The L is compared.

  If ΔCNT <0.5L, the car 2 is reversed on the shielding portion S, and therefore, it is determined that 0 does not pass through the shielding portion S. To go to step S36, and the process goes to step S36.

  If 0.5L ≦ ΔCNT <1.5L, it is determined that the car 2 has passed the installation position determination shielding portion Sa, the length of the shielding portion is stored in the buffer in step S33, and the unreliability flag is set in step S34. The process is turned OFF, the process proceeds to step S35, the shielding part passage flag is turned OFF, the process proceeds to step S36, and the process is terminated.

  When 1.5L ≦ ΔCNT <2.5L, it is determined that the car 2 has passed through the step number determining shielding portion Sb having the shielding portion length of 2L, that is, the step number determining shielding portion Sb having the first step length, and step S33 The length of the shielding part is stored in the buffer in step S34, the unreliability flag is turned off in step S34, the process proceeds to step S35, the shielding part passage flag is turned off, the process proceeds to step S36, and the process is terminated.

  Similarly, in the case of (Nmax + 0.5) L ≦ ΔCNT <(Nmax + 1.5) L, the cage 2 has a shielding portion length of (Nmax + 1) L and the shielding portion Sb for determining the number of steps, that is, the Nmax step. In step S33, the length of the shielding part is stored in the buffer, in step S34, the unreliability flag is turned off, and the process proceeds to step S35. The passage flag is turned OFF, the process proceeds to step S36 and the process is terminated.

  Further, in the case of (Nmax +1.5) L ≦ ΔCNT, since there is no such a long shielding part, it is determined that it is unreliable, the unreliability flag is turned on, the process proceeds to step S35, and the shielding part passage flag is set. The process is turned off and the process proceeds to step S36.

  Here, when the unreliability flag is turned on, as shown in the flowchart of FIG. 10, the shielding part passage flag, the plate passage flag, and the zone update flag are turned off, and the section is ZM, that is, the car 2 is the section ZM. It is supposed to be in

Next, the processing of the car position section determination unit 33 will be described with reference to the flowcharts of FIGS.
First, when the process is started (step S40), the state of the plate passage flag is determined in step S41. As shown in the flowchart of FIG. 6, when the initial setting is left as it is, or when the unreliability flag is turned on in step S32 of the flowchart of FIG. 9, the plate passage flag is turned off. The process ends (step S42), and the process of this flowchart ends.

  If the plate passage flag is turned ON in step S16 of the flowchart of FIG. 8 and the result is stored in the buffer, the process proceeds from step S41 to step S43. Here, based on the result of the flowchart of FIG. 7, when the driving direction is determined to be up (UP), the process proceeds to step S44, and when the driving direction is determined to be down (DN), the flowchart of FIG. Move to A.

In step S44, a determination is made based on the result of step S32 in the flowchart of FIG.
Here, when it is determined that the shielding part length is 0, that is, it has not passed through the shielding part, it is determined that the car 2 has not left the section (section maintenance), and the process proceeds to B in the flowchart of FIG. .

Next, when it is determined that the installation position determination shielding portion Sa has been passed, the process proceeds to step S45, and the length of the shielding portion that the car 2 has passed last time is determined.
For example, when it has not yet passed through the shielding part last time (that is, 0), or when it has been judged that the previous time has passed the shielding part Sa for installation position judgment, the car 2 is reversed on the shielding part immediately after turning on the power, Therefore, it is determined that the car 2 has not left the section (section maintenance), and the process proceeds to B in the flowchart of FIG.

If it is determined in step S45 that the previous step has passed through the first-stage-length-determining shielding portion Sb, it is determined that the car 2 has moved to the section ZD2, and the process proceeds to step S46.
In step S46, if the required zone update flag remains OFF, the process proceeds to B in the flowchart of FIG. Also, if the required zone update flag is ON in step S20 of the flowchart of FIG. 8, the process proceeds to step S47, the reliability deficiency flag is turned OFF, and the process proceeds to B of the flowchart of FIG.

  Similarly, if it is determined in step S45 that the previous time has passed the stage number determination shielding part Sb having the Nmax stage length, it is determined that the car 2 has moved to the section ZM, and the process proceeds to step S46. In the same manner as described above, the process proceeds from step S46 and step S47 to B in the flowchart of FIG.

  If it is determined in step S44 that the first-stage length stage number determining shielding part Sb has been passed, it is determined that the car 2 has moved to the section ZU1, and the process proceeds to step S46. In the same manner as described above, the process proceeds from step S46 and step S47 to B in the flowchart of FIG.

  Similarly, when it is determined in step S44 that the Nmax stage length has passed through the number-of-stages determining shielding part Sb, it is determined that the car 2 has moved to the section ZUmax, and the process proceeds to step S46. In the same manner as described above, the process proceeds from step S46 and step S47 to B in the flowchart of FIG.

Next, the flowchart of FIG. 12 will be described.
If it is determined as DN in step S43 of FIG. 11, the process proceeds to step S50. Hereinafter, the processing from step S50 to the front of step S54 is substantially the same as the processing from step S44 to B at the lower end of FIG.

If it is determined in step S50 that the shielding portion length is 0, that is, it has not passed through the shielding portion, it is determined that the car 2 has not left the section (section maintenance), and the process proceeds to step S54.
In step S54, the shielding length buffer is cleared and the process proceeds to step S55. In step S55, the zone update flag is turned off and the process proceeds to step S56. In step S56, the plate passage flag is turned off and the process is performed. End (step S57).

Next, when it is determined that the installation position determination shielding portion Sa has been passed, the process proceeds to step S51, and the length of the shielding portion that the car 2 has previously passed is determined.
For example, when it has not yet passed through the shielding part last time (that is, 0), or when it has been judged that the previous time has passed the shielding part Sa for installation position judgment, the car 2 is reversed on the shielding part immediately after turning on the power, Therefore, it is determined that the car 2 has not left the section (section maintenance), and the process proceeds to step S54. Further, in the same manner as described above, the process proceeds to step S54 to step S57 and the process is terminated.

If it is determined in step S51 that the previous step has passed through the first-stage-length-stage-determining shielding portion Sb, it is determined that the car 2 has moved to the section ZU12, and the process proceeds to step S52.
In step S52, if the required zone update flag remains OFF, the process proceeds to step S54. If the required zone update flag is ON, the process proceeds to step S53, the unreliability flag is turned OFF, and similarly to the above, the process proceeds to step S54 to step S57 and the process is terminated.

  Similarly, if it is determined in step S51 that the previous time has passed the stage number determination shielding part Sb having the Nmax stage length, it is determined that the car 2 has moved to the section Z1M, and the process proceeds to step S52. Then, in the same manner as described above, the process proceeds to step S52 to step S57 and the process is terminated.

  If it is determined in step S50 that the first-stage length stage number determination shielding portion Sb has been passed, it is determined that the car 2 has moved to the section ZD11, and the process proceeds to step S52. Then, in the same manner as described above, the process proceeds to step S52 to step S57 and the process is terminated.

  Similarly, if it is determined in step S50 that the Nmax stage length has passed through the number-of-stages determining shielding part Sb, it is determined that the car 2 has moved to the zone ZD1max, and the process proceeds to step S52. Then, in the same manner as described above, the process proceeds to step S52 to step S57 and the process is terminated.

  Further, in the flowchart of FIG. 11, what is supposed to shift to B of the flowchart of FIG. 12 shifts to step S54 in the flowchart of FIG. Thereafter, similarly to the above, the process proceeds to step S54 to step S57 in sequence, and the process is terminated.

Next, the flowchart will be described using a specific example.
Here, the case where the car 2 is between the plates U3 and D3 in FIG.
As described above, the initial setting at the time of turning on the power is as shown in FIG.

  Here, since the encoder 22 is attached to a rotating body (governor 15) that supports the rope vibration system, the count value of the encoder 22 always moves slightly up and down even when the car 2 is stopped. Therefore, the count value CNT is approximately zero.

In the flowchart of FIG. 8, when the car 2 starts to rise (step S10), when the signal 22a of the encoder 22 is first input, the initial state of the previous sensor input (signal 23a from the photoelectric sensor 23) is Since the optical axis is not blocked, it is determined that the previous sensor input is high in step S11, and the process proceeds to step S12. And since this sensor input is also High, it is judged as High in Step S12, and it shifts to Step S13.
Here, since the count value CNT is approximately 0 and the initial value of the end value SE is also 0, NO is determined in step S13, and the process proceeds to step S17 to end the process (step S18).

When the car 2 further rises, the signal 22a of the encoder 22 is input to the direction determination unit 31 as the count value CNT from the encoder processing unit 30 of FIG. At this time, since the count value CNT is set to increase when the car 2 rises, the count value CNT increases as the car 2 rises.
When the count value CNT is input, the previous count value CNT is compared with the current count value CNT in the flowchart of FIG. Since the previous count value CNT is approximately 0 and the current count value CNT is larger, it is determined that the operation direction is UP.

Next, in the shielding part length measurement part 32, the monitoring of the input state of the signal 23a from the photoelectric sensor 23 is processed as shown in the flowchart of FIG.
In the flowchart of FIG. 8, when the process is started (step S10), the previous sensor input is high (step S11), and the current sensor input is also high (step S12), so the process proceeds to step S13.

Here, since the initial value of the end value SE is 0 and the count value CNT increases, the absolute value of the difference between the count value CNT and the end value SE increases.
If the absolute value of the difference between the count value CNT and the end value SE is greater than 2L, YES is determined in step S13 and the process proceeds to step S14. However, the zone update flag remains at the initial value, that is, is OFF. In step S14, it is determined to be OFF, and the process proceeds to steps S17 and S18 to end the process.

Since the shielding part passage flag is OFF, the flowchart of FIG. 9 proceeds to steps S30, S31, and S36 and ends. Further, since the plate passage flag is also OFF, the flowchart of FIG. 11 proceeds to steps S40, S41, and S42, and the process is terminated.
That is, the flowcharts of FIGS. 9 and 11 are not substantially executed unless the shielding portion passage flag and the plate passage flag are turned on.

When the car 2 further rises and the photoelectric sensor 23 detects the installation position determination shielding portion Sa of the plate U3, the optical axis of the photoelectric sensor 23 is blocked and the signal 23a becomes Low. Therefore, Step S11 is High, but Step S12 is determined to be Low.
As a result, the process proceeds to step S19, and the count value CNT at that time is taken in as the start value SS. Furthermore, in step S20, the zone update flag is turned ON, the process proceeds to steps S17 and S18, and the process is terminated.

  Since both the shielding part passage flag and the plate passage flag are OFF, the flowcharts of FIGS. 9 and 11 are not substantially executed as described above.

  Furthermore, if the car 2 continues to rise and the photoelectric sensor 23 continues to detect the installation position determination shielding portion Sa, the signal 23a continues to be Low, and is determined to be Low in Step S11, and the process proceeds to Step S21. To do. Since it is also determined as Low in step S21, the process proceeds to steps S17 and S18 and the process is terminated.

  Further, when the car 2 rises and the photoelectric sensor 23 ends the detection of the installation position determination shielding portion Sa and detects the gap G, the signal 23a becomes High. Therefore, when it is determined as Low in Step S11 and the process proceeds to Step S21, it is determined as High in Step S21 and the process proceeds to Step S22.

In step S22, the count value CNT at that time is taken in as the end value SE. Further, in step S23, the absolute value of the difference between the end value SE and the start value SS is taken in as a shielding part length signal ΔCNT. In this embodiment,
ΔCNT≈L.
Next, in step S24, the shielding part passage flag is turned ON, the process proceeds to steps S17 and S18, and the process is terminated.

Next, the flowchart of FIG. 9 is executed.
First, when the process is started (step S30), the state of the shielding part passage flag is determined in step S31. Since the shielding part passage flag is ON in step S24, the process proceeds to step S32, and the length of the shielding part length signal ΔCNT is determined.

  Here, since ΔCNT≈L (0.5L ≦ ΔCNT <1.5L) in step S23, it is determined that the car 2 has passed the installation position determination shielding portion Sa, and the length of the shielding portion is determined in step S33. Is stored in the buffer, the unreliability flag is turned off in step S34, the process proceeds to step S35, and the shielding part passage flag is turned off, and the process is terminated (step S36).

  Subsequently, in FIG. 11 which is a flowchart of the process of the car position section determination unit 33, since the plate passage flag is OFF, the process proceeds to Steps SS40, S41, and S42 as described above, and the process ends.

Next, returning to the flowchart of FIG. 8, if the car 2 continues to rise and the photoelectric sensor 23 continues to detect the gap G of the plate U3, the signal 23a continues to be high, step S11 and step S11. In S12, both are determined to be High, and the process proceeds to Step S13.
Since the detection of the gap G is continued, the absolute value of the difference between the count value CNT and the end value SE at the present time is 2L or less. Therefore, NO is determined in step S13, and the process proceeds to steps S17 and S18. Exit.

When the car 2 further rises and the photoelectric sensor 23 detects the stage number determination shielding portion Sb of the plate U3, the optical axis of the photoelectric sensor 23 is blocked and the signal 23a becomes Low. For this reason, Step S11 is High as in the previous case, but is determined Low in Step S12.
As a result, the process proceeds to step S19, and the count value CNT at that time is newly taken in as the start value SS. Furthermore, in step S20, the zone update flag is turned ON, the process proceeds to steps S17 and S18, and the process is terminated.

  Furthermore, if the car 2 continues to rise and the photoelectric sensor 23 continues to detect the stage number determination shielding part Sb, the signal 23a continues to be Low, and is determined to be Low in Step S11, and the process proceeds to Step S21. . Since it is also determined as Low in step S21, the process proceeds to steps S17 and S18 and the process is terminated.

  Further, when the car 2 rises and the photoelectric sensor 23 ends the detection of the stage number determination shielding portion Sb, the signal 23a becomes High. Therefore, when it is determined as Low in Step S11 and the process proceeds to Step S21, it is determined as High in Step S21 and the process proceeds to Step S22.

In step S22, the count value CNT at that time is taken in as the end value SE. Further, in step S23, the absolute value of the difference between the end value SE and the start value SS is taken in as a shielding part length signal ΔCNT. In this embodiment,
ΔCNT≈4L.
Next, in step S24, the shielding part passage flag is turned ON, the process proceeds to steps S17 and S18, and the process is terminated.

Next, the flowchart of FIG.
First, when the process is started (step S30), the state of the shielding part passage flag is determined in step S31. Since the shielding part passage flag is ON in step S24, the process proceeds to step S32 to determine the length of the shielding part length signal ΔCNT.

  Here, since ΔCNT≈4L (3.5L ≦ ΔCNT <4.5L) in step S23, it is determined that the car 2 has passed through the third-stage length stage number determination shielding portion Sb, and in step S33. The length of the shielding part is stored in the buffer, the unreliability flag is turned off in step S34, the process proceeds to step S35, the shielding part passage flag is turned off, the process proceeds to step S36, and the process is terminated.

  Next, returning to the flowchart of FIG. 8, if the car 2 continues to rise and the photoelectric sensor 23 continues to detect the space above the plate U3, the signal 23a continues to be high, step S11 and step S11. In S12, both are determined to be High, and the process proceeds to Step S13. If the absolute value of the difference between the count value CNT and the end value SE at the current time is greater than 2L, YES is determined in step S13, and the process proceeds to step S14.

  Here, since the zone update flag is already ON in step S20, the process proceeds to step S15. Then, it is determined from the result of the flowchart in FIG. 7 that the driving direction is UP, the process proceeds to step S16, the plate passage flag is turned on, the process proceeds to steps S17 and S18, and the process is terminated.

Next, the processing of the car position section determination unit 33 will be described with reference to the flowcharts of FIGS.
First, when the process is started (step S40), the state of the plate passage flag is determined in step S41.
Since the plate passage flag is ON in step S16 of the flowchart of FIG. 8 and the driving direction is UP according to the flowchart of FIG. 7, the process proceeds from step S41, S43 to step S44.

  In step S44, the latest shielding part length is determined. Here, since ΔCNT≈4L is satisfied in step S23, it is determined that the car 2 has passed through the third-stage-length-stage determining shielding portion Sb, so that it is determined that section = ZU3, and step S46. Migrate to Here, since the required zone update flag is ON in step S20, the process proceeds to step S47, the reliability lack flag is turned OFF, and the process proceeds to B in the flowchart of FIG.

  Next, the process proceeds to step S54 from B in the flowchart of FIG. In step S54, the shielding length buffer is cleared and the process proceeds to step S55. In step S55, the zone update flag is turned off and the process proceeds to step S56. In step S56, the plate passage flag is turned off and the process ends ( Step S57).

  As described above, according to the present embodiment, it can be seen that the car 2 is in the zone ZU3 and is rising.

Next, a case where the car 2 is between the plates U2 and U3 in FIG.
As described above, the initial setting at the time of turning on the power is as shown in FIG.
Here, similarly to the above-described embodiment at the time of increase, the processing immediately after the power is turned on is performed, and the count value CNT becomes approximately zero.

When the car 2 further descends, the signal 22a of the encoder 22 is input to the direction determination unit 31 as the count value CNT from the encoder processing unit 30 of FIG. At this time, since the count value CNT is set to decrease when the car 2 is lowered, the count value CNT is decreased as the car 2 is lowered.
When the count value CNT is input, the previous count value CNT is compared with the current count value CNT in the flowchart of FIG. Since the previous count value CNT is approximately 0 and the current count value CNT is smaller, the operation direction is determined to be DN.

Next, in the shielding part length measurement part 32, the monitoring of the input state of the signal 23a from the photoelectric sensor 23 is processed as shown in the flowchart of FIG.
In the flowchart of FIG. 8, when the process is started (step S10), the previous sensor input is high (step S11), and the current sensor input is also high (step S12), so the process proceeds to step S13.

Here, since the initial value of the end value SE is 0 and the count value CNT decreases, the absolute value of the difference between the count value CNT and the end value SE increases.
If the absolute value of the difference between the count value CNT and the end value SE is greater than 2L, YES is determined in step S13 and the process proceeds to step S14. However, the zone update flag remains at the initial value, that is, is OFF. In step S14, it is determined to be OFF, and the process proceeds to steps S17 and S18 to end the process.

Since the shielding part passage flag is OFF as in the case of the above-described rising, the flowchart of FIG. 9 is ended by moving to steps S30, S31, and S36, and the plate passage flag is also OFF. Thus, in the flowchart of FIG. 11, the process proceeds to steps S40, S41, and S42, and the process ends.
Therefore, as in the case of the above-described rise, the flowcharts of FIGS. 9 and 11 are not substantially executed unless the shielding portion passage flag and the plate passage flag are turned on.

When the car 2 further descends and the photoelectric sensor 23 detects the stage number determination shielding portion Sb of the plate U3, the optical axis of the photoelectric sensor 23 is blocked and the signal 23a becomes Low. Therefore, Step S11 is High, but Step S12 is determined to be Low.
Accordingly, the process proceeds to step S19, and the count value CNT at that time is taken as the start value SS. Furthermore, in step S20, the zone update flag is turned ON, the process proceeds to steps S17 and S18, and the process is terminated.

  Since both the shielding part passage flag and the plate passage flag are OFF, the flowcharts of FIGS. 9 and 11 are not substantially executed as described above.

  Further, when the car 2 continues to descend and the photoelectric sensor 23 continues to detect the stage number determination shielding portion Sb, the signal 23a continues to be Low, and is determined to be Low in Step S11, and the process proceeds to Step S21. . Since it is also determined as Low in step S21, the process proceeds to steps S17 and S18 and the process is terminated.

  Further, when the car 2 descends and the photoelectric sensor 23 ends the detection of the stage number determination shielding part Sb and detects the gap part G, the signal 23a becomes High. Therefore, when it is determined as Low in Step S11 and the process proceeds to Step S21, it is determined as High in Step S21 and the process proceeds to Step S22.

In step S22, the count value CNT at that time is taken in as the end value SE. Further, in step S23, the absolute value of the difference between the end value SE and the start value SS is taken in as a shielding part length signal ΔCNT. In this embodiment,
ΔCNT≈4L.
Next, in step S24, the shielding part passage flag is turned ON, the process proceeds to steps S17 and S18, and the process is terminated.

Next, the flowchart of FIG. 9 is executed.
First, when the process is started (step S30), the state of the shielding part passage flag is determined in step S31. Since the shielding part passage flag is ON in step S24, the process proceeds to step S32 to determine the length of the shielding part length signal ΔCNT.

  Here, since ΔCNT≈4L (3.5L ≦ ΔCNT <4.5L) in step S23, it is determined that the car 2 has passed through the third-stage length stage number determination shielding portion Sb, and in step S33. The length of the shielding part is stored in the buffer, the unreliability flag is turned off in step S34, the process proceeds to step S35, the shielding part passage flag is turned off, and the process is terminated (step S36).

  Subsequently, in FIG. 11 which is a flowchart of the process of the car position section determination unit 33, since the plate passage flag is OFF, the process proceeds to Steps SS40, S41, and S42 as described above, and the process ends.

Next, returning to the flowchart of FIG. 8, if the car 2 continues to descend and the photoelectric sensor 23 continues to detect the gap G of the plate U3, the signal 23a continues to be high, step S11 and step S11. In S12, both are determined to be High, and the process proceeds to Step S13.
Since the detection of the gap G is continued, the absolute value of the difference between the count value CNT and the end value SE at the present time is 2L or less. Therefore, NO is determined in step S13, and the process proceeds to steps S17 and S18. Exit.

When the car 2 further descends and the photoelectric sensor 23 detects the installation position determination shielding portion Sa of the plate U3, the optical axis of the photoelectric sensor 23 is blocked and the signal 23a becomes Low. For this reason, Step S11 is High as in the previous case, but is determined Low in Step S12.
As a result, the process proceeds to step S19, and the count value CNT at that time is newly taken in as the start value SS. Furthermore, in step S20, the zone update flag is turned ON, the process proceeds to steps S17 and S18, and the process is terminated.

  Further, when the car 2 continues to descend and the photoelectric sensor 23 continues to detect the installation position determination shielding portion Sa, the signal 23a continues to be Low, and is determined to be Low in Step S11, and the process proceeds to Step S21. To do. Since it is also determined as Low in step S21, the process proceeds to steps S17 and S18 and the process is terminated.

  Further, when the car 2 descends and the photoelectric sensor 23 finishes detecting the installation position determination shielding portion Sa, the signal 23a becomes High. Therefore, when it is determined as Low in Step S11 and the process proceeds to Step S21, it is determined as High in Step S21 and the process proceeds to Step S22.

In step S22, the count value CNT at that time is taken in as the end value SE. Further, in step S23, the absolute value of the difference between the end value SE and the start value SS is taken in as a shielding part length signal ΔCNT. In this embodiment,
ΔCNT≈L.
Next, in step S24, the shielding part passage flag is turned ON, the process proceeds to steps S17 and S18, and the process is terminated.

Next, the flowchart of FIG.
First, when the process is started (step S30), the state of the shielding part passage flag is determined in step S31. Since the shielding part passage flag is ON in step S24, the process proceeds to step S32 to determine the length of the shielding part length signal ΔCNT.

  Here, since ΔCNT≈L (0.5L ≦ ΔCNT <1.5L) in step S23, it is determined that the car 2 has passed the installation position determination shielding portion Sa, and the length of the shielding portion is determined in step S33. Is stored in the buffer, the unreliability flag is turned off in step S34, the process proceeds to step S35, and the shielding part passage flag is turned off, and the process is terminated (step S36).

  Next, returning to the flowchart of FIG. 8, when the car 2 continues to descend and the photoelectric sensor 23 continues to detect the space below the plate U3, the signal 23a continues to be high, and the steps S11 and S11 are performed. In S12, both are determined to be High, and the process proceeds to Step S13. If the absolute value of the difference between the count value CNT and the end value SE at the current time is greater than 2L, YES is determined in step S13, and the process proceeds to step S14.

  Here, since the zone update flag is already ON in step S20, the process proceeds to step S15. Here, it is determined from the result of the flowchart of FIG. 7 that the driving direction is DN, the process proceeds to step S16, the plate passage flag is turned ON, the process proceeds to steps S17 and S18, and the process is terminated.

Next, the processing of the car position section determination unit 33 will be described with reference to the flowcharts of FIGS.
First, when the process is started (step S40), the state of the plate passage flag is determined in step S41.
Since the plate passage flag is ON in step S16 of the flowchart of FIG. 8, the process proceeds to step S43. Further, since the operation direction is DN according to the flowchart of FIG. 7, the process proceeds to A of the flowchart of FIG.

The process moves from A in the flowchart of FIG. 12 to step S50. In this step S50, the latest shielding part length is determined.
Here, since ΔCNT≈L in step S23, it is determined that the car 2 has passed the installation position determination shielding portion Sa, and the process proceeds to step S51.

In step S51, the previous length of the shielding portion is determined. Since the previous shielding portion length is 4L, that is, the third step length, it is determined that section = Z1M, and the process proceeds to step S52. Here, since the required zone update flag is ON in step S20, the process proceeds to step S53, the reliability lack flag is turned OFF, and the process proceeds to step S54.

  In step S54, the shielding length buffer is cleared and the process proceeds to step S55. In step S55, the zone update flag is turned off and the process proceeds to step S56. In step S56, the plate passage flag is turned off and the process is performed. End (step S57).

  As described above, according to the present embodiment, it can be seen that the car 2 is in the zone Z1M and is descending.

  As described above, according to the present embodiment, there is only one kind (one row) of plates and one photoelectric sensor for the plates. Therefore, the number of plates and photoelectric sensors can be reduced as compared with the prior art.

  In the above-described embodiment, each plate has a plate with a long stage number determination shielding portion Sb arranged on the center side of the hoistway 1. However, if this apparatus only detects the position of the car 2, In addition, it is also possible to arrange a plate having a short stage number judging shield Sb on the center side of the hoistway 1.

  However, when used for ETS, the arrangement of the above embodiment is desirable. For example, in FIG. 2, the long plate U3 with the stage number judging shielding part Sb is arranged on the upper end side of the hoistway 1, and then the plate U2 and the short plate U1 with the stage number judging shielding part Sb are arranged on the central side of the hoistway 1. The following problems can occur:

  When the car 2 rises after the power is turned on in the vicinity of the middle of the stage number judging shield Sb of the plate U3 on the upper end side, the car 2 passes only a part of the stage number judging shield Sb of the plate U3. Is determined to have passed through a plate having a short plate number determination shielding portion Sb, for example, plate U1.

  That is, it is determined that the car 2 has passed the plate located on the center side of the hoistway 1. If it does so, since it will be judged that the cage | basket | car 2 exists in the position away from the upper end of the hoistway 1, the cage | basket | car 2 will be raised at high speed. For this reason, the car 2 may collide with the upper end of the hoistway 1.

  However, when the short plate of the stage number determination shielding part Sb is arranged on the end side of the hoistway 1 as in the above embodiment, the car 2 passes only a part of the stage number determination shielding part Sb. In this case, it is determined that the car 2 has passed through a plate having a short plate number determination shielding portion Sb, that is, a plate closer to the upper end than the actual plate. Therefore, the speed of the car 2 is decelerated, which is safe.

  Each plate is arranged such that the installation position determination shielding portion Sa faces the center of the hoistway 1, but conversely, the installation position determination shielding portion Sa faces the upper and lower ends of the hoistway 1. It is also possible to arrange.

Furthermore, although the length of the shielding part S (Sa, Sb) and the gap G of each plate is a multiple of the basic unit length L, the length of each shielding part S (Sa, Sb) and the gap G is the same. As long as it is a distinguishable length, it is not necessarily a multiple of the basic unit length L.
Furthermore, in the said embodiment, although the plate is arrange | positioned at three places each on the upper and lower sides of the hoistway 1, it is not restricted to three places, What is necessary is just to increase / decrease the number of plates as needed.

  In the above-described embodiment, the upper and lower plates of the hoistway 1 are vertically symmetric (U1 and D1 etc.) about the center of the hoistway 1, but it is also possible to make all the plates have different lengths. .

  Further, in the above-described embodiment, the initial value of the car position section is set to ZM in order to avoid erroneous detection at normal acceleration after power-on. However, the initial value of the car position section may be the end side of the hoistway 1 such as ZU1 or ZD1. In this case, in consideration of safety, it is desirable to drive at a low speed until it passes through any of the plates.

Although the elevator having the machine room 11 has been described with reference to FIG. 1, it is needless to say that the elevator can be similarly applied to an elevator without a machine room. Further, the roping of the main rope 10 is not limited to the configuration shown in FIG.
Moreover, although the encoder 22 is provided in the governor, it can also be provided in a governor tension pulley, a sheave or a motor of a hoisting machine.

Furthermore, although the said plate is arrange | positioned at the upper and lower parts of a hoistway, it is also possible to arrange | position to only one of the upper and lower parts of a hoistway as needed.
Moreover, although the photoelectric sensor 23 is used as a sensor, you may use other sensors, such as an infrared sensor, a magnetic sensor, an ultrasonic sensor, and image recognition.

DESCRIPTION OF SYMBOLS 1 Hoistway 2 Car 15 Governor 16 Tension pulley 22 Encoder 23 Photoelectric sensor G Gap part L Basic unit length Sa Installation position judgment shielding part Sb Stage number judgment shielding part U1-U3, D1-D3 Plate

Claims (5)

An encoder that detects the amount of movement and the direction of operation of the elevator car,
A plurality of plates disposed in the hoistway and having a gap and a shield;
A sensor that is installed in the car so as to face the plate, and detects a gap portion and a shielding portion of the plate;
In those with
The plate has a shape in which the shielding portion sandwiches the gap portion from above and below, and one shielding portion of the shielding portions has a basic unit length in the vertical direction, and the other shielding portion is in the vertical direction. There are a plurality of types whose length is a multiple of the basic unit length and whose length in the vertical direction of the other shielding portion is different,
An elevator apparatus characterized in that the position of the car is specified by the vertical lengths of the gap and the shielding part of the plate detected by the encoder and the sensor, and the driving direction of the car.   The vertical lengths of the gap and the shielding part of the plate are detected by a signal from the encoder and a signal from the sensor that detects whether or not the car is currently traveling on the shielding part of the plate. The elevator apparatus according to claim 1, wherein the elevator apparatus is configured as described above.   Each of the plates is disposed in the hoistway so that the plate having a short vertical length of the other shield is on the end side of the hoistway, and in each plate, the one shield is The elevator apparatus according to claim 1, wherein the elevator apparatus is disposed so as to face a center side of the hoistway.   The elevator apparatus according to any one of claims 1 to 3, wherein the sensor detects upper and lower ends of the shielding portion.   The elevator apparatus according to any one of claims 1 to 4, wherein the sensor is a photoelectric sensor.