Patent Publication Number: US-2021163265-A1

Title: Reference Core Position Calculation Device for Elevator and Reference Core Position Calculation Method

Description:
TECHNICAL FIELD 
     The present invention relates to a reference core position calculation device for an elevator and a reference core calculation method. 
     BACKGROUND ART 
     An elevator installation work requires skills and is regarded as a work in a 3D (demanding, dirty, and dangerous) environment. In recent years, shortage of installation work technicians has become a major problem in the elevator industry. 
     The installation work is large, and is performed in an order of an elevator shaft (which may also be referred to as an inside of a tower) reference centering work, a rail centering and fixing work, an exit and entrance installation work, elevator cab assembly, and a test run and adjustment work. Here, the elevator shaft reference centering work is a work for determining a main position and dimensions serving as a reference for elevator installation, which particularly requires skills. The elevator shaft reference centering work is a main work that will affect elevator installation accuracy and finally affect comfort when taking an elevator if the work is carelessly performed. 
     Here, for dimension measurement in the elevator shaft related to reference centering, for example, PTL 1 discloses that “distances in both a horizontal direction and a vertical direction can be safely, easily, and automatically measured in a spiral manner by one laser range finder provided on an elevator cab while the elevator cab is normally operated without taking an elevator out of service” as a method for measuring the elevator shaft during an elevator renewal work which is an invention related to automation technology that reduces work loads and does not necessarily require skills. 
     As a method for measuring an elevator shaft during a new installation work of an elevator (hereinafter, referred to as a new installation work), for example, PTL 2 discloses that “measuring a distance in a horizontal direction that is substantially perpendicular to a longitudinal direction with a transport machine that moves in a structure body in the longitudinal direction and a distance sensor connected to the transport machine”. 
     CITATION LIST 
     Patent Literature 
     PTL 1: JP-A-2003-66143 
     PTL 2: Japanese Patent No. 5497658 
     SUMMARY OF INVENTION 
     Technical Problem 
     However, the related arts described above do not disclose specific matters related to a process of determining a reference core position of the elevator shaft that is necessary in a new elevator installation work. 
     In order to automatically measure a dimension of an elevator shaft, for example, PTL 1 discloses a technique for providing, on the elevator cab (hereinafter, referred to as a cab), the laser range finder that measures a distance up to an object and a motor that causes the laser range finder to scan the object with a laser beam, and spirally measuring dimensions in the elevator shaft by scanning the object with the laser light when the cab moves up and down. That is, PTL 1 discloses a method for measuring the elevator shaft assuming that a renewal work such as elevator repair is performed. 
     PTL 2 discloses a technique for measuring the distance in the horizontal direction that is substantially perpendicular to the longitudinal direction with the transport machine that moves in the structure body in the longitudinal direction and the distance sensor connected to the transport machine. 
     Here, when a new elevator is to be installed, it is necessary to determine a “reference core” position in an elevator shaft during installation of a rail and determine an exit and entrance position and a rail position. 
     However, as described above, PTL 1 discloses automatic measurement in an elevator shaft targeting on a renewal work when a repair work or the like is performed, but does not disclose determination of a “reference core position”. PTL does not disclose “determination of a reference core position” of the elevator shaft which is a necessary work in a new installation work. Therefore, the related arts described above cannot automatically measure a reference core position necessary in installation of an elevator in an elevator shaft. 
     The invention has been made in view of the above circumstances, and aims to automatically measure a reference core position necessary in installation of an evaporator in an elevator shaft. 
     Solution to Problem 
     In order to solve the problems described above, the invention provides a reference core position calculation device that calculates a reference core position of an elevator shaft in which an elevator is to be installed. The reference core position calculation device includes a measurement unit that measures a dimension of each portion in the elevator shaft, and a calculation unit that calculates portion dimension values of the elevator shaft based on the reference core position and the dimension of each portion measured by the measurement unit. When the reference core position is a first reference core position, the calculation unit determines whether portion dimension values of the elevator shaft calculated based on the first reference core position satisfy a predetermined specification. 
     Advantageous Effect 
     According to the invention, a reference core position necessary in elevator installation in an elevator shaft can be automatically measured. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a diagram showing a configuration example of a reference core position calculation device for an elevator shaft. 
         FIG. 2  is a block diagram showing a configuration example of the reference core position calculation device for the elevator shaft. 
         FIG. 3  is a diagram showing an example of a reference centering procedure of the reference core position calculation device for the elevator shaft. 
         FIG. 4  is a diagram showing an example of the reference centering procedure of the reference core position calculation device for the elevator shaft. 
         FIG. 5  is a diagram showing an example of an operation processing flow of the reference core position calculation device for the elevator shaft. 
         FIG. 6  is a diagram showing a display example of the reference core position calculation device for the elevator shaft. 
         FIG. 7  is a diagram showing a display example of the reference core position calculation device for an elevator shaft. 
         FIG. 8  is a diagram showing an example of dimension measurement and dimension value calculation in the reference core position calculation device for the elevator shaft. 
         FIG. 9  is a diagram showing an example of dimension measurement and dimension value calculation in the reference core position calculation device for the elevator shaft. 
         FIG. 10  is a diagram showing an example of dimension measurement and dimension value calculation in the reference core position calculation device for the elevator shaft. 
         FIG. 11  is a diagram showing an example of dimension measurement and dimension value calculation in the reference core position calculation device for the elevator shaft. 
         FIG. 12  is a perspective view showing an example of a return mark position jig used when a return mark position is automatically recognized and measured in the reference core position calculation device for the elevator shaft. 
         FIG. 13  is a diagram showing an example of automatically recognizing and measuring a return mark position in the reference core position calculation device for the elevator shaft. 
         FIG. 14  is a diagram showing an example of automatically recognizing and measuring a return mark position in the reference core position calculation device for the elevator shaft. 
         FIG. 15  is a diagram showing an example of automatically recognizing and measuring a return mark position in the reference core position calculation device for the elevator shaft. 
         FIG. 16  is a diagram showing an example of automatically recognizing and measuring a return mark position in the reference core position calculation device for the elevator shaft. 
         FIG. 17A  is a plan view showing a return mark position jig according to an embodiment used when a return mark position is automatically recognized and measured in the reference core position calculation device for the elevator shaft. 
         FIG. 17B  is a plan view showing a return mark position jig according to a first modification used when a return mark position is automatically recognized and measured in the reference core position calculation device for the elevator shaft. 
         FIG. 17C  is a plan view showing a return mark position jig according to a second modification used when a return mark position is automatically recognized and measured in the reference core position calculation device for the elevator shaft. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     Hereinafter, embodiments of the invention will be described in detail with reference to drawings. Each of the drawings in the present specification shows an example. In the present specification, the same reference numerals in the drawings denote the same or similar configurations or processings. Only a difference between a previous embodiment and a subsequent embodiment will be described, and description of a subsequent embodiment may be omitted. A part of or all of the embodiments and modifications can be combined within a scope of the technical idea of the invention and within an integration scope. 
     Embodiment 
     &lt;Configuration of Reference Core Position Calculation Device&gt; 
       FIG. 1  is a diagram showing a configuration example of a reference core position calculation device for an elevator shaft.  FIG. 1  is a schematic perspective view showing a reference core position calculation device  100  applied to an elevator shaft  500  for elevator installation according to an embodiment. Although an example of a building having four floors is described in the present embodiment, the invention is not limited to application to a building having four floors, and may be applied to a building having two or more floors. 
     The reference core position calculation device  100  includes a measurement unit  101 , a device housing  102  of the measurement unit  101 , a substrate  103  on which a calculation processing device (not shown) that performs calculation and control of the reference core position calculation device  100  is mounted, and a measurement distance sensor  104 . Here, an example of the distance sensor  104  includes a laser scanning distance sensor. The distance sensor  104  can measure a distance up to an object to be measured by a laser beam emitted from the distance sensor  104 . 
     The reference core position calculation device  100  further includes a suspension hook  106 , a ring portion  106   a  of the suspension hook  106 , and a rope  115 . The suspension hook  106  is integrally attached to the device housing  102 . The ring portion  106   a  is provided at a tip end of the suspension hook  106 , and is engaged with an end portion of the rope  115 . 
     A hoist machine  150  is attached in the vicinity of an elevator shaft top portion  500   u . The hoist machine  150  includes a hoist drive unit  150   a , a hoist drum  150   b , a rope guide  150   c  for guiding the rope  115  to hang vertically downward in a predetermined position in a drum width of the hoist drum  150   b , and an encoder  150   e  that detects the number of rotations of the hoist drum  150   b.    
     In the present embodiment, an example of the encoder  150   e  includes a rotary encoder. Based on output information from the rotary encoder, rotation information such as the number of rotations and a rotational speed of the hoist drum  150   b  can be detected, and a length of the rope gradually released from the hoist drum  150   b  can be determined. The reference core position calculation device  100  can also detect, by the encoder  150   e , which height position of the elevator shaft  500  the measurement unit  101  is in based on the determined rope length. Here, lifting or lowering the reference core position calculation device  100  in the elevator shaft  500  is performed by the hoist machine  150  winding up or gradually releasing the rope  115  that suspends the reference core position calculation device  100 . 
     As described above, the distance sensor  104  attached to the reference core position calculation device  100  is, for example, a scanning laser sensor. The distance sensor  104  emits a laser beam  104 L and the laser beam hits an object to be measured. The distance sensor  104  detects a reflected beam of the laser beam to output a distance up to the object to be measured. Here, since the distance sensor  104  can be rotated in a direction indicated by an arrow C in  FIG. 1 , the distance sensor  104  can measure distances to an inner wall of the elevator shaft  500  in a horizontal cross section of the elevator shaft  500 . The distance sensor  104  is not limited to a sensor using the laser beam  104 L, and may be a sensor using light or sound. 
       FIG. 1  shows a first floor surface  510 , a second floor surface  520 , a third floor surface  530 , and a fourth floor surface  540  of an elevator. A first floor exit and entrance opening  510   d  is provided on the first floor surface  510  of the elevator shaft  500 . Similarly, a second exit and entrance opening  520   d , a third exit and entrance opening  530   d , and a fourth exit and entrance opening  540   d  are respectively provided on the second floor surface  520 , the third floor surface  530 , and the fourth floor surface  540  of the elevator shaft  500 .  FIG. 1  shows a reference return mark  510   a  that is scribed in advance on the first floor surface  510  which is a reference floor. 
     The reference core position calculation device  100  includes laser oscillators  108  and  109  that detect a position of the reference core position calculation device  100  in a horizontal direction at a bottom surface end portion of the device housing  102 . Position sensitive detectors (PSD)  208  and  209  that detect positions of laser beams  108   a  and  109   a  emitted from the laser oscillators  108  and  109  are provided on an elevator shaft bottom surface  500 L of a pit of the elevator shaft  500 . 
     The reference core position calculation device  100  further includes a laser height sensor  110  that measures a distance from a bottom surface side of the device housing  102  down to the elevator shaft bottom surface  500 L. Since radiation positions (not shown) of the laser beams  108   a  and  109   a  on light receiving surfaces of PSDs  208  and  209  are changed when the reference core position calculation device  100  swings due to an influence of wind or the like blown in the elevator shaft  500 , it is possible to obtain information on how much the reference core position calculation device  100  is shifted from a vertical position in a situation in which no swing or the like occurs based on shift amounts of the radiation positions and distance information of the height sensor  110 . 
       FIG. 1  shows the return mark  510   a  serving as a reference position on a building reference floor (typically the first floor). An installation position of a rail for regulating a cab when an elevator moves up and down and an installation position of an exit and entrance door are determined based on a position of the return mark  510   a . Generally, the return mark  510   a  is also used as a reference position for another floor based on the return mark of the reference floor (the first floor in most cases). 
     Distance measurement by the reference core position calculation device  100  is started from measurement of the position of the return mark  510   a . Measurement of the return mark  510   a  of the first floor serving as a reference position is generally performed in an initial stage. 
     &lt;Functional Configuration of Reference Core Position Calculation Device&gt; 
       FIG. 2  is a block diagram showing a functional configuration example of the reference core position calculation device for the elevator shaft. As shown in  FIG. 2 , the reference core position calculation device  100  includes the measurement unit  101 , the distance sensor  104 , the laser oscillators  108  and  109 , the height sensor  110 , a power supply unit  111 , a calculation unit  112 , a control unit  113 , and the PSDs  208  and  209 . Each of the measurement unit  101 , the calculation unit  112 , and the control unit  113  is a calculation processing device such as a microcomputer. 
     The distance sensor  104  includes a rotary unit on a horizontal surface, and measures a distance to an inner wall or the like of the elevator shaft  500  at each angle position of rotation with respect to a reference angle. The laser oscillators  108  and  109  detect a planar position of the reference core position calculation device  100 . The height sensor  110  detects a height of the reference core position calculation device  100  in a lifting and lowering direction. The power supply unit  111  is a battery or an external power supply, and supplies drive power to the reference core position calculation device  100 . 
     The calculation unit  112  is a calculation processing device such as a microcomputer, and calculates distance components of the elevator shaft in an X direction and a Y direction (see  FIG. 1 ) based on the distance measured by the distance sensor  104  and an angle position at the time of measurement. The calculation unit  112  also performs an OK determination and an NG determination for a reference core position to be described later, and further performs a calculation to change the reference core position so that portion dimension values of the elevator shaft  500  is within a specification. The control unit  113  collectively controls a measurement operation, a lifting and lowering operation, measurement result display, or the like of the entire reference core position calculation device  100 . 
     As shown in  FIG. 2 , the hoist machine  150 , a drive power supply  151  that supplies power to the hoist machine  150 , and a terminal device  160  are connected to the reference core position calculation device  100 . The terminal device  160  is a personal computer, a slate terminal such as a tablet and a smart phone, a personal digital assistant (PDA), or the like that is capable of displaying a list of portion dimension values from a reference core position in the elevator shaft  500  to be described later. The portion dimension values are calculated based on a measured distance and angle information. The terminal device  160  is connected to the reference core position calculation device  100  so that wired or wireless communication can be performed. 
     &lt;Reference Centering Procedure&gt; 
       FIGS. 3 and 4  are diagrams showing a reference centering procedure of the reference core position calculation device for the elevator shaft.  FIGS. 3 and 4  show a cross section of the elevator shaft  500 . When the elevator shaft  500 , an elevator shaft wall  505 , the floor surface  510  in front of the elevator, and a return mark position  600  (the same as the return mark  510   a ) serving as an installation origin are positioned as shown in  FIGS. 3 and 4 , an axis in which a vertically upper side passing through the return mark position  600  is a positive direction is defined as an X axis  610  and an axis in which a horizontal left side passing through the return mark position  600  is a positive direction is defined as a Y axis  620 . 
     When a work is to be performed in an elevator, a right direction and a left direction are typically defined by viewing an elevator shaft  500  side from a hall side on the floor surface  510 . In the present embodiment, a right direction and a left direction are also defined according to the above-described definition. 
     Here, “D (right)” shown in  FIG. 3  is a distance from a right reference core position P 1  to a front side wall of the elevator shaft  500 . “G (right front)” is a distance from the reference core position P 1  to a corner where a front side wall and a vertical wall of the elevator shaft  500  intersect in a Y direction. “C (right)” is a distance from the reference core position P 1  to the front side wall. “H (right)” is a distance from the reference core position P 1  to a rear side wall. “G (right rear)” is a distance from the reference core position P 1  to a corner where a rear wall and the vertical wall of the elevator shaft  500  intersect in the Y direction. “D (left)”, “G (left front)”, “C (left)”, “H (left)”, and “G (left rear)” shown in  FIG. 3  are terms obtained by substituting “right” in “D (right)”, “G (right front)”, “C (right)”, “H (right)”, and “G (right rear)” with “left”, and indicate a part of portion dimension values calculated based on a reference core position P 2  located at a left side as viewed from a floor surface  510  side. “G (right front)”, “G (left front)”, “G (right rear)”, and “G (left rear)” are distances measured in a case in which a three-side frame (not shown) is provided. 
       FIG. 4  shows a part of portion dimension values when the reference core positions P 1  and P 2  are intentionally shifted to reference core positions P 1 ′ and P 2 ′. 
     For an actual elevator installation work, in a manual reference centering work in the related art, based on figure information, two piano wires (not shown) hang, with respect to the return mark position  600  shown in  FIG. 4 , from the elevator shaft top portion  500   u  toward the known right side reference core position P 1  and the left side reference core position P 2  that are design values. Next, feet of the two piano wires coincide with the reference core positions P 1  and P 2  on the reference floor. Then, distances from piano wire positions to portions of the elevator shaft are measured by a convex, a straightedge, or a curved ruler on each floor and are recorded. After the measurement work is repeated from the first floor to an uppermost floor, it is confirmed whether recorded dimension values converge in a predetermined specification and are proper dimensions. Here, when a part of the dimensions does not converge in the specification, the reference core positions P 1  and P 2  are intentionally moved to the reference core positions P 1 ′ and P 2 ′, or a part of the elevator shaft wall  505  is removed so as to converge the part of the dimensions in predetermined dimensions. This work needs to be performed when an elevator installation work technician negotiates with a building customer, and is a work that requires skills. 
     In this manner, in the manual reference centering work in the related art, the work technician measures a distance using a convex, a straightedge, or a curved ruler. In contrast, in the present embodiment, the distance sensor  104  emits the laser beam  104 L to a measurement object, measures time by using a reflected beam of the laser beam  104 L, and measures a distance by applying triangulation. In the present embodiment, the distance sensor  104  is mounted on a rotary stage (not shown), and measures a distance while the rotary stage is rotated, so that the distance sensor  104  can measure any distance by performing scanning in the elevator shaft  500 . 
     &lt;Operation of Reference Core Position Calculation Device&gt; 
       FIG. 5  is a diagram showing an operation processing flow of the reference core position calculation device for the elevator shaft. The reference core position calculation device  100  receives an operation from the work technician and starts a processing (step S 100 ). First, in step S 110 , the reference core position calculation device  100  acquires the number of floors (FL) of the elevator shaft  500 , an allowable tolerance of a dimension of each portion, and figure information such as reference core position information taking a return mark position as a reference (an origin). A method of setting the acquired information may be inputting the information in the reference core position calculation device  100  by the work technician, or downloading the information automatically from CAD data of the elevator shaft  500  to the reference core position calculation device  100 . For example, first, the reference core position calculation device  100  may be moved up and down in the elevator shaft  500  and the number of exits and entrances is counted to set the number of floors (FL). 
     Next, in step S 120 , the reference core position calculation device  100  resets a counter N indicating a floor number to 0. Next, in step S 140 , the reference core position calculation device  100  increments the counter N by +1 and prepares for measurement of an N-th floor. Next, in step S 150 , the reference core position calculation device  100  determines whether N=1. When N=1 (YES in step S 150 ), the reference core position calculation device  100  proceeds the processing to step S 160 . On the other hand, when N&gt;1 (NO in step S 150 ), the reference core position calculation device  100  proceeds the processing to step S 190 . 
     In step S 160 , the reference core position calculation device  100  determines whether the counter N is equal to or less than a total number of floors FL. When N≤FL (YES in step S 160 ), the reference core position calculation device  100  proceeds the processing to step S 170 . On the other hand, when N&gt;FL (NO in step S 160 ), the reference core position calculation device  100  proceeds the processing to step S 250 . 
     When N=1 (YES in step S 150 ) and N≤FL (YES in step S 160 ), the reference core position calculation device  100  performs measurement for the first floor. First, the return mark position  600  shown on the floor surface  510  needs to be measured in advance. Therefore, in step S 170 , the reference core position calculation device  100  measures the return mark position  600  using the distance sensor  104 . The return mark position  600  may be input based on the figure information. 
     Next, in step S 180 , the reference core position calculation device  100  confirms a horizontal position of the distance sensor  104  using the laser oscillators  108  and  109 , and corrects a measurement value of the return mark position of the reference floor measured in step S 170  based on changes in positions on the light receiving surface of the PSDs  208  and  209 . Steps S 170  and S 180  are setting processings unique to the reference floor. 
     Next, in step S 190 , the reference core position calculation device  100  corrects a position of the measurement unit  101  in the same manner as in step S 170  for the counter N incremented by +1 in step S 140 . Next, in step S 200 , the reference core position calculation device  100  measures a dimension of each portion of the elevator shaft  500  on the N-th floor. 
     Next, in step S 210 , the reference core position calculation device  100  performs smoothing for measurement results in step S 200 , performs first-order approximation for data in a straight line portion, and calculates coordinates of corner portions of the elevator shaft  500 . A method for calculating the coordinates of the corner portions will be described in detail later. Next, in step S 220 , the reference core position calculation device  100  calculates distances Lm (m is a positive integer indicating an index) from the reference core positions P 1  and P 2  in the figure information to the corner portions of the elevator shaft  500 , calculates portion dimension values based on the distances Lm, and stores the portion dimension values in a predetermined storage area. 
     Here, the distances Lm refer to, for example, L 1  to L 12  to be described later with reference to  FIG. 11 . The portion dimension values calculated based on the distances Lm refers to portion dimension values necessary in elevator installation, such as “measurement positions” “A (left)”, “A (right)”, “B (left)” . . . “G”, and “H” as shown in, for example,  FIGS. 6 and 7 . The portion dimension values calculated based on the distances Lm are the distances Lm, or are calculation results based on the distances Lm. 
     In  FIGS. 6 and 7 , numerical values displayed on display cells corresponding to “floors” and “measurement positions” are omitted. 
     Next, in step S 230 , the reference core position calculation device  100  further displays, on the terminal device  160 , distances from the reference core positions P 1  and P 2  to corners of the elevator shaft, that is, portion dimensions necessary in elevator installation, on a floor basis. Then, when acquisition of measurement data on a floor basis is completed in steps S 190  to S 230 , in step S 240 , the reference core position calculation device  100  moves the measurement unit  101  up by one floor using the hoist machine  150 . 
     Subsequent to step S 240 , the processing returns to step S 130  and step S 140 , the reference core position calculation device  100  increments the counter N by +1. The reference core position calculation device  100  repeats processings of incrementing the counter N by +1 instep S 140 , NO in step S 150 , and processings in steps S 190  to S 240  until N&gt;FL (NO in step S 160 ). 
     When measurement for all floors is completed and N&gt;FL (NO in step S 160 ), in step S 250 , the reference core position calculation device  100  displays, on the terminal device  160 , the portion dimension values (for example, main dimension values) that are measured and calculated from the reference floor (the first floor) to the uppermost floor and are calculated based on the distances Lm from the reference core positions P 1  and P 2 . Here, in step S 260 , the reference core position calculation device  100  determines whether the portion dimension values satisfy a specification based on reference information or the like input in step S 110 . For a portion dimension value outside the specification, the reference core position calculation device  100  displays a warning to identify the portion dimension value outside the specification from other dimension values in a corresponding display portion (a display cell) as shown in the example in  FIG. 6 . In the example in  FIG. 6 , a hatched display cell corresponds to a warning display. 
     Next, in step S 270 , in order to converge the dimension value outside the specification in a specification value, the reference core position calculation device  100  outputs a warning to manually change the reference core positions P 1  and P 2 , or automatically change coordinates of the reference core positions P 1  and P 2  relative to the return mark position  600 . In the example in  FIG. 6 , in step S 270 , the reference core position calculation device  100  displays the reference core positions P 1 ′ and P 2 ′ before and after a change on a reference core position change content display  1010   c . Further, in an example in  FIG. 7 , in step S 270 , the reference core position calculation device  100  displays, as a changed reference core position display  1010   d , portion dimension values based on new and changed reference core positions P 1 ′ and P 2 ′ on the terminal device  160  again. 
     For example, the work technician may appropriately manually shift coordinate positions of the reference core positions P 1  and P 2  to coordinate positions of the reference core positions P 1 ′ and P 2 ′ corresponding to a warning output of manually changing the coordinate positions of the reference core positions P 1  and P 2 . Alternatively, for example, the calculation unit  112  of the reference core position calculation device  100  may automatically calculate the coordinate positions of the reference core positions P 1  and P 2  so as to change the coordinate positions of the reference core positions P 1  and P 2  to the coordinate positions of the reference core positions P 1 ′ and P 2 ′, so that a sum of errors of the distances Lm from the reference core positions P 1  and P 2  from the reference floor to the uppermost floor is minimum. Alternatively, the calculation unit  112  of the reference core position calculation device  100  may automatically calculate the coordinate positions of the reference core positions P 1  and P 2  so as to change the coordinate positions of the reference core positions P 1  and P 2  to the coordinate positions of the reference core positions P 1 ′ and P 2 ′, so that an error is preferentially reduced from a distance Lm having a high importance degree among the distances Lm. As a result, finally, all portion dimension values calculated based on the distances Lm are converged in specification values, and a warning display of a dimension value outside the specification is canceled as shown in  FIG. 7 . 
     Next, in step S 280 , when not all portion dimension values on all floors are converged in specification values, the reference core position calculation device  100  displays, on the terminal device  160 , distances Lm based on which a corresponding portion dimension value cannot be converged in a specification value, and reference core positions P 1 ′ and P 2 ′ that are estimated to be appropriate positions in a case in which a corresponding portion dimension value is not converged in a specification value, and portion dimension values at the reference core positions P 1 ′ and P 2 ′. When the processing in step S 280  is completed, the reference core position calculation device  100  ends a series of measurement and reference centering work processings (step S 290 ). Here, the reference core positions P 1 ′ and P 2 ′ may be set so that a worker can intentionally change and input a reference core position. 
     &lt;Display Example in Reference Core Position Calculation Device&gt; 
       FIGS. 6 and 7  are diagrams showing display examples in the reference core position calculation device for the elevator shaft.  FIGS. 6 and 7  are diagrams showing a list of portion dimension values that are measurement and calculation results and are necessary in elevator installation. 
     As shown in  FIGS. 6 and 7 , the terminal device  160  includes a monitor screen  1000 . The monitor screen  1000  includes a display area  1010  for displaying portion dimension values obtained by measuring and calculating dimensions of the elevator shaft  500 . The display area  1010  is a GUI or the like. The display area  1010  includes a display area  1010   a  for displaying portion dimension values and specifications of the portion dimension values, and a display area  1010   b  for displaying measurement and calculation results of the portion dimension values. 
     An elevator work technician negotiates with a building customer to confirm whether there is a problem in an elevator installation work with reference to the table shown in the display area  1010 . 
     Although not shown, “-” may be displayed in a display cell in  FIGS. 6 and 7 , which refers to that a corresponding item in the display cell is an item that does not necessarily require measurement or calculation. 
     A hatched display cell in  FIG. 6  displays a value indicating that a measurement and calculation result, a portion dimension value, is not within a specification, that is, a dimension error. When one or a plurality of portion dimension values calculated based on the distances Lm from the reference core positions P 1  and P 2  are not converged in a predetermined dimension tolerance, as shown in  FIG. 6 , a corresponding display cell is hatched in a red background color or the like to warn the work technician, and the work technician can recognize that it is necessary to shift the reference core positions P 1  and P 2  to appropriate positions. 
     The terminal device  160  includes a touch panel and other input devices in addition to the monitor screen  1000 . The work technician can change and input a portion dimension value displayed in a display cell by touching a portion of a display cell, or operating an input device such as a keyboard and a mouse. 
     &lt;Dimension Measurement and Dimension Value Calculation&gt; 
       FIGS. 8 to 11  are diagrams showing examples of dimension measurement and dimension value calculation in the reference core position calculation device for the elevator shaft.  FIGS. 8 to 11  show cross sections of the elevator shaft  500 . In  FIGS. 8 to 11 , an elevator cab  650  accommodated in the elevator shaft  500  and surrounded by the elevator shaft wall  505  is indicated by a two-dot chain line. A plate  300  contact-fixed to the elevator shaft wall  505  closes a space between two font side walls of the elevator shaft  500  from the hall side of the floor surface  510 . The laser beam  104 L emitted from the distance sensor  104  is used to measure, at a plurality of measurement points  250 , a distance from a measurement center of the distance sensor  104  to an inner wall of the elevator shaft wall  505 . The plate  300  is not necessarily a continuous plate, and may be provided at two ends in contact with at least the two front side walls of the elevator shaft  500 . 
     The distance sensor  140  measures a distance L from the measurement center to the elevator shaft wall  505  while being rotated continuously or stepwisely by controlling an angle θ around a rotation center of the distance sensor  140 . An X axis direction distance and a Y axis direction distance to the center of the distance sensor  104  can be calculated by converting the distance L into a return mark X direction (X axis) component and a return mark Y direction (Y axis) component based on the distance L and the angle θ during measurement. 
       FIG. 9  shows a state in which the distance sensor  104  is rotated by 360° around the center of the distance sensor  104 , and measures the inner wall of the elevator shaft wall  505  over a round. Similarly, a plurality of measurement points obtained by measurement are indicated by the measurement points  250 . 
     In  FIG. 10 , each side of the elevator shaft wall  505  in  FIG. 9  is approximated by a primary straight line  250 L, and each intersection point  260  at each corner portion is indicated by a rhombus ♦.  FIG. 11  shows the distances Lm (m is a positive integer indicating an index) indicated by double-ended arrows. Calculation results of the portion dimension values based on the distances Lm are automatically loaded into the tables as shown in  FIGS. 6 and 7 . 
     &lt;Automatic Recognition and Measurement of Return Mark Position&gt; 
       FIG. 12  is a perspective view showing an example of a return mark position jig used when a return mark position is automatically recognized and measured in the reference core position calculation device for the elevator shaft.  FIGS. 13 to 17  are diagrams showing examples of automatically recognizing and measuring a return mark position in the reference core position calculation device for the elevator shaft. 
     As shown in  FIG. 12 , a return mark position jig  700  includes a top portion  700   a  and a flat surface portion  700   b . The top portion  700   a  has a triangular prism shape formed of two inclined surfaces that face each other and form an intersection line (a ridge). When viewed from an upper side, one of the two inclined surfaces has a ridgeline  700   c  and the other inclined surface has a ridgeline  700   d  in the top portion  700   a.    
       FIG. 13  shows a diagram of providing the return mark position jig  700  at the return mark position  600  at the hall side of the elevator shaft  500 .  FIG. 14  shows a state in which the distance sensor  104  is rotated while changing the angle θ around the center of the distance sensor  104 , and performs scanning to measure distances to the return mark position jig  700 . As shown in  FIG. 14 , a distance from the measurement center of the distance sensor  104  to the return mark position jig  700  is measured at a plurality of measurement points  255  using the laser beam  104 L. 
       FIG. 15  is a diagram showing the measurement points  255  measured using the return mark position jig  700 . Similar to the measurement of a distance to the inner wall of the elevator shaft wall  505 ,  FIG. 15  shows a state in which straight line portions from the measurement points  255  are approximated to draw approximate straight lines  255 L 1 ,  255 L 2 , and  255 L 3 .  FIG. 16  shows a diagram in which each of three intersection points of the approximate straight lines  255 L 1 ,  255 L 2 , and  255 L 3  shown in  FIG. 15  is indicated by a rhombus ♦. Here, a distance JL in  FIGS. 15 and 16  is known as a dimension of the return mark position jig  700 . Therefore, the return mark position  600  that cannot be directly measured by the laser beam  104 L can be estimated based on the distance JL. 
     &lt;Modification of Return Mark Position Jig&gt; 
     Modifications of the return mark position jig will be described with reference to  FIGS. 17A to 17C .  FIG. 17A  is a plan view showing the return mark position jig according to the present embodiment used when the return mark position is automatically recognized and measured in the reference core position calculation device for the elevator shaft.  FIG. 17B  is a plan view showing a return mark position jig according to a first modification used when a return mark position is automatically recognized and measured in the reference core position calculation device for the elevator shaft.  FIG. 17C  is a plan view showing a return mark position jig according to a second modification used when a return mark position is automatically recognized and measured in the reference core position calculation device for the elevator shaft. A return mark position jig  710  shown in  FIG. 17B  according to the first modification and a return mark position jig  720  shown in  FIG. 17C  according to the second modification will be described in comparison with the return mark position jig  700  shown in  FIG. 17A  according to the present embodiment. 
     When viewed from an upper side, the return mark position jig  710  according to the first modification includes a top portion  710   a  having ridgelines  710   c  and  710   d  as shown in  FIG. 17B . The top portion  710   a  corresponds to the top portion  700   a  of the return mark position jig  700 . As can be seen from a comparison between  FIGS. 17A and 17B , the return mark position jig  710  only includes the top portion  710   a  without a flat surface portion, and an intersection point of the ridgeline  710   c  and the ridgeline  710   d  is at the return mark position  600 . 
     When viewed from an upper side, the return mark position jig  720  according to the second modification includes a top portion  720   a  having ridgelines  720   c  and  720   d  as shown in  FIG. 17C . The top portion  720   a  corresponds to the top portion  700   a  of the return mark position jig  700 . As can be seen from a comparison between  FIGS. 17A and 17C , the return mark position jig  720  only includes the top portion  720   a  without a flat surface portion, and an intersection point of the ridgeline  720   c  and the ridgeline  720   d  is at the return mark position  600 . 
     The return mark position  600  can be estimated by measuring a distance to a surface on a jig by the distance sensor  104  with any one of the return mark position jig  710  according to the first modification and the return mark position jig  720  according to the second modification. 
     &lt;Embodiment Effect&gt; 
     According to the present embodiment, a reference core position necessary in elevator installation in an elevator shaft is automatically determined based on a comparison between specification values and portion dimension values calculated based on an automatic measurement result of a shape and a dimension of an inner wall of the elevator shaft, so that an elevator shaft reference core position in the elevator shaft can be safely and easily calculated in a short time without requirement for skills. Therefore, it is possible to improve efficiency of reference core position design which is difficult for those who are not skilled workers having skills or know-how and improve efficiency of a negotiation work with customers. 
     A shape or dimension measurement work of an inner wall of an elevator shaft is automated, so that a work technician can proceed with another work, and work efficiency of an overall elevator installation work can be improved. Further, the shape or dimension measurement work of an inner wall of an elevator shaft in the related art includes a work at a high place and is a dangerous work. In contrast, since many processings are automated according to the present embodiment, a work technician can be relieved from the dangerous work. 
     The invention is not limited to the embodiments described above, and includes various modifications. For example, the embodiments described above have been described in detail for easy understanding of the invention, and the invention is not necessarily limited to those including all configurations described above. A part of configurations of one embodiment can be replaced with configurations of another embodiment, and configurations of one embodiment can be added to configurations of another embodiment. A part of configurations of the embodiments may be added, deleted, or distributed in other configurations, or may be integrated or replaced with other configurations. Processings described in the embodiments may be appropriately distributed or integrated based on processing efficiency or implementation efficiency. 
     REFERENCE SIGN LIST 
     
         
           100  reference core position calculation device 
           101  measurement unit 
           102  device housing 
           103  substrate 
           104  distance sensor 
           104 L laser beam 
           106  suspension hook 
           106   a  ring portion 
           108 ,  109  laser oscillator 
           108   a ,  109   a  laser beam 
           110  height sensor 
           111  power supply unit 
           112  calculation unit 
           113  control unit 
           115  rope 
           140  distance sensor 
           150  hoist machine 
           150   a  hoist drive unit 
           150   b  hoist drum 
           150   c  rope guide 
           150   e  encoder 
           151  drive power supply 
           160  terminal device 
           208  PSD 
           250  measurement point 
           250 L primary straight line 
           255  measurement point 
           255 L 1 ,  255 L 2  approximate straight line 
           260  intersection point 
           300  plate 
           500  elevator shaft 
           500 L elevator shaft bottom surface 
           500   u  elevator shaft top portion 
           505  elevator shaft wall 
           510  floor surface 
           510   a  return mark 
           510   d  exit and entrance opening 
           520   d  exit and entrance opening 
           530   d  exit and entrance opening 
           540   d  exit and entrance opening 
           600  return mark position 
           610  X axis 
           620  Y axis 
           700  return mark position jig 
           700   a  top portion 
           700   b  flat surface portion 
           700   c  ridgeline 
           700   d  ridgeline 
           710  return mark position jig 
           710 ,  720  return mark position jig 
           710   a  top portion 
           710   c  ridgeline 
           710   d  ridgeline 
           720  return mark position jig 
           720   a  top portion 
           720   c  ridgeline 
           720   d  ridgeline 
           1000  monitor screen 
           1010  display region 
           1010   a  display area 
           1010   b  display area 
           1010   c  reference core position change content display 
           1010   d  changed reference core position display