JP7154730B1 - Large Scale and Method for Detecting and Notifying Retreat of Subject - Google Patents

Abstract

The present invention relates to a large weighing scale and method for detecting and notifying a person to be weighed of moving backward on the tread surface. A rectangular weighing platform on which a person to be weighed sits, weighing sensors arranged at four corners of the weighing platform, and a control unit that calculates a weighing value of the person to be weighed based on output values of the weighing sensors. a first total value of the output values of the pair of weighing sensors arranged on the front side of the weighing platform; The moving direction of the person to be weighed is determined based on a second total value of the output values of the pair of weighing sensors arranged on the rear side of the weighing platform and a third total value of the output values of all the weighing sensors. To provide a large weighing scale characterized by comprising a detection part for detecting and notifying when backward movement is detected. The moving direction of the person to be weighed is detected from the output value of the weighing sensor. [Selection drawing] Fig. 1

Description

TECHNICAL FIELD The present invention relates to a large weighing scale on which a person to be weighed can move on a tread, and more particularly to a large weighing scale that detects and notifies the person of being weighed backward on the tread and a method therefor.

Traditionally, hospitals and nursing homes have used large, thin scales with handrails and ramps so that people in wheelchairs can climb onto the weighing platform without having to lift their legs or directly step on the weighing platform to weigh themselves. (For example, Patent Literature 1 and Patent Literature 2). A person who is able to walk grabs the handrail, climbs up the slope, climbs onto the weighing platform, and measures their weight. measure. After completing the weigh-in, either walk forward or move forward in a wheelchair to get off the weighing platform. Only one pair of slopes and handrails is provided on the weighing platform, so that the person to be weighed can recognize the direction of travel.

Japanese Patent Application Laid-Open No. 2020-112359 JP-A-11-211550

However, some persons to be weighed tend to move backwards to get off the weighing platform instead of moving forwards to get off the weighing platform after weighing. It is very dangerous for people using wheelchairs or walking aids to go backwards on slopes because they may not be able to check the condition of their feet and fall. In Patent Document 2, the position of the person to be weighed is detected by a plurality of position sensors.

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and provides a weighing scale that detects a moving direction of a person to be weighed, especially backward movement, and notifies danger.

In order to solve the above problem, in one aspect of the present disclosure, a rectangular weighing platform on which a person to be weighed is placed, weighing sensors arranged at four corners of the weighing platform, and based on the output values of the weighing sensors, and a control section for calculating a weight value of a person to be weighed, wherein the person to be weighed can move on the tread surface of the weighing platform, and a pair of the weighing scales arranged on the front side of the weighing platform. a first total value of the output values of the sensors, a second total value of the output values of the pair of weighing sensors arranged on the rear side of the weighing platform, and a third total value of the output values of all the weighing sensors and a detection unit for detecting the direction of movement of the person to be weighed based on the above, and for notifying the person when retreating is detected.

According to the above aspect, the moving direction of the person to be weighed is detected from the output value of the weighing sensor used for weighing. It is possible to measure the weight of the person to be weighed and detect the direction of movement without adding any special equipment. By notifying when the person to be weighed moves backward, it is possible to reduce the risk of falling due to the person to be weighed moving backward.

In one aspect, after the third total value is stabilized for a predetermined period of time, the detection unit detects that the ratio between the value obtained by subtracting the second total value from the first total value and the third total value is , when the vehicle has decreased by a predetermined value or more, it is determined that the vehicle is moving backward, and a notification is given.

Further, in the method of detecting and informing the person to be weighed that the person to be weighed moves backward according to an aspect of the present disclosure, the person to be weighed is placed on a rectangular weighing platform on which the person to be weighed is placed. A method of detecting and notifying that the person being weighed is moving backward using a large weighing scale capable of moving on the tread surface of the weighing platform, wherein the output of the pair of weighing sensors arranged on the front side of the weighing platform. a first total value of the values, a second total value of the output values of the pair of weighing sensors arranged on the rear side of the weighing platform, and a third total value of the output values of all the weighing sensors. , after the third total value is stabilized for a predetermined time, the direction of movement is detected from a ratio between the first total value minus the second total value and the third total value, and the ratio is a predetermined value; When the vehicle has decreased more than the above, it is determined that the vehicle is moving backward, and a notification is given.

As is clear from the above description, it is possible to provide a weighing scale that detects and notifies the person to be weighed of moving backward.

1 shows a perspective view of a weight scale according to a preferred embodiment of the disclosed arrangement; FIG. It is a rear view of the same weight scale. It is a top view of the same weight scale. It is a control block diagram of the same weight scale. It is a weighing flow using the same weight scale. 4 is a graph of test data showing output values; 1 is a graph of test data showing first and second sum values; 1 is a graph of test data showing pre- and post-rates.

Hereinafter, specific embodiments of the configuration of the present disclosure will be described with reference to the drawings. The embodiments are illustrative rather than limiting, and not all features or combinations thereof described in the embodiments are necessarily essential to the invention.

(embodiment)
A preferred embodiment according to the configuration of the present disclosure will be described with reference to the drawings. FIG. 1 is a perspective view of a weight scale 100 according to an embodiment. FIG. 2 is a front view of weight scale 100. As shown in FIG. FIG. 3 is a plan view of weight scale 100. As shown in FIG. FIG. 4 is a block diagram of the control system of weight scale 100. As shown in FIG.

As shown in FIG. 1, the weight scale 100 is a large weight scale that allows the person to be weighed not only to stand on it to measure the weight, but also to measure the weight of the person to be weighed while sitting in a wheelchair. configured to

The weighing scale 100 has a weighing platform 20 on which a load to be weighed is applied, legs 8 , handrails 6 , and a display 10 .

The weighing platform 20 is formed in a large rectangular shape, and has a wide upper surface serving as a tread surface and a thin overall structure so that the person to be weighed can step on it safely. The weighing platform 20 has a structure having sufficient rigidity, and is configured, for example, by sandwiching a honeycomb-shaped reinforcing plate (not shown) between an iron frame and an iron plate.

A front slope 18 is provided on the front side of the weighing platform 20, and a rear slope 19 is provided on the rear side of the weighing platform 20, so that a person to be weighed in a wheelchair can climb onto the weighing platform 20 in a wheelchair. It is The front slope 18 and the rear slope 19 are gentle slopes connected to the floor surface, and each surface is provided with a non-slip so that the person to be weighed does not slip when getting on and off. The tread surface of the weighing table 20 is configured to have a size that allows the person to be weighed to move, and is large enough for a person to be weighed in a wheelchair to safely climb on and stop on the tread surface.

A left side bar 22 and a right side bar 24 are connected to the left and right ends of the weighing platform 20 . Each of the side bars 22 and 24 is formed in a hollow columnar shape, and wiring, electronic substrates, etc. are accommodated therein. Handrails 6 are attached to the upper surfaces of the side bars 22 and 24 so that the person to be weighed who has difficulty in walking can catch and stand.

A pole 30 is detachably and rotatably attached to the upper surface of one of the side bars 22 and 24 (the right side bar 24 in this embodiment) near the handrail 6. ing. The pole 30 is erected vertically, then curved and horizontal, and the display 10 is attached to the tip thereof.

As shown in FIG. 3, in this embodiment, a pole 30 is attached to the front of the upper surface of the right side bar, and the horizontal portion of the pole 30 is directed forward and parallel to the right side of the weighing platform 20 . The angle is adjusted so that From the arrangement of the handrail 6, the front slope 18, the rear slope 19, the pole 30, etc., as indicated by the thick arrow in FIG. It is possible.

The display 10 is provided with a display screen 34 and an input section 36 . The display screen 34 is, for example, a liquid crystal display. The display screen 34 displays setting conditions, weighing results, data such as the moving direction of the person to be weighed, which will be described later, and other displays necessary for setting.

The input unit 36 is, for example, a key switch. The weigher can perform various settings and commands such as "tare subtraction", "output of weighing value", and "zero point reset" from this key switch. In addition, the display screen 34 and the input unit 36 may be configured integrally and provided as a touch panel type input unit 36 .

A control unit 38 and a power source (battery or the like) 40 for performing various arithmetic processing are also provided inside the display device 10 . As shown in FIG. 4, the display 10 further includes a notification unit 37, which is information notification means such as an LED that indicates the state by means of light emission, a buzzer, and a speaker that emits sound. The display screen 34 may display notification information, and the display screen 34 may also serve as the notification unit 37 .

A leg 8 is provided on the lower surface of each side bar 22 , 24 . The legs 8 are arranged at both ends of each side bar 22 , 24 , that is, at each corner of the weighing platform 20 . Weighing sensors 42a-42d are provided between the legs 8 and the side bars 22, 24, and the weighing platform 20 is supported via the weighing sensors 42a-42d.

Here, the depth side of the weight scale 100 is the front, and the front side is the rear. A second weighing sensor 42b provided on the left rear of the weighing platform 20), a third weighing sensor 42c provided on the front of the right side bar 24 (left front of the weighing platform 20), a rear of the right side bar 24 (left of the weighing platform 20) ) are collectively referred to as the measurement sensor 42 unless otherwise specified.

The weighing sensor 42 is a sensor that measures the load applied to the weighing platform 20, and a load cell is used, for example. The weighing sensors 42a to 42d individually output, which are amplified by amplifiers 44a to 44d and can be transmitted to the controller 38 in the display 10. FIG. The configuration of the weighing sensor 42 is not particularly limited, and for example, a load cell is used. Although illustration is omitted, as a specific configuration of the weighing sensor 42, four gauges are attached to the four thin-walled portions of the strain-generating body of the Roberval load cell, and these four gauges constitute a bridge circuit. The control unit 38 can determine the output values (data that have not been converted into weighing values or have undergone arithmetic processing). Not only the configuration of the weighing sensor 42 but also the shape of the strain generating body is not particularly limited, and conventionally known configurations such as column type, Roberval type, and ring type may be used.

The control unit 38 is a microcomputer in which at least a CPU and memory are mounted on an integrated circuit, and performs arithmetic processing based on programs stored in the memory. Mainly, the control unit 38 calculates the weight values of the objects to be weighed on the weighing table 20 based on the output values W1 to W4 from the weight sensors 42a to 42d, and controls to display the weight values on the display screen 34. do.

The weighing scale 100 has a moving direction detection section 39 that detects the moving direction of the person to be weighed who has climbed onto the weighing platform 20 . The movement direction detection unit 39 is stored as a program in the memory of the control unit 38 and configured in the control unit 38 as software. The output value of the weighing sensor input to the control unit 38 and the data in the memory are also provided to the moving direction detection unit 39 .

The movement direction detection unit 39 performs arithmetic processing based on the output values W1 to W4 of the weighing sensors 42a to 42d, and if it determines that the person to be weighed is moving backward, it is displayed on the display screen 34 or the notification unit 37. Inform the person to be weighed of danger by notifying with sound and light.

(Detection method)
The moving direction detection unit 39 detects a first total value S1, which is the sum of the output values W1 and W3 of the pair of weighing sensors 42a and 42c arranged on the front side of the weighing platform 20, and a pair of sensors arranged on the rear side of the weighing platform 20. A second total value S2, which is the total value of the output values W2, W4 of the weighing sensors 42b, 42d, and a third total value S3, which is the total value of all the weighing sensors 42a to 42d, run onto the platform 20 to be weighed. The direction of movement of the person to be weighed, especially the movement of the person to be weighed, is detected. Specifically, the movement direction detection unit 39 first calculates the first total value S1, the second total value S2, and the third total value S3, and calculates the difference value between the first total value S1 and the second total value S2. A front/rear ratio R1 is calculated as a ratio to the third total value S3. When the front-to-rear ratio R1 increases, it is determined that the person to be weighed has moved forward on the tread surface, and when it has decreased, it is determined that the person to be weighed has moved backward.

First, when the person to be weighed climbs onto the rear slope 19 provided on the rear side of the weighing platform 20 and stands still on the tread surface in order to measure the weight, the output value of the weighing sensor 42 stabilizes. Weight is calculated.

After the weighing, the person to be weighed moves forward and descends from the front slope 18 provided on the front side of the weighing platform 20, so when the tread moves forward, the front-to-rear ratio R1 starts to increase. Conversely, when the weigher retreats and retreats on the tread to get off the rear slope 19 used for riding, the front-to-rear ratio R1 begins to decrease.

The movement direction detection unit 39 immediately notifies the person being weighed of danger through the notification unit 37 or the display screen 34 when the front-rear ratio R1 decreases or decreases to a predetermined value or more after weighing. The notification method includes, for example, displaying an alert on the display screen 34, emitting sound or voice from the notification unit 37, lighting or blinking light (LED), and the like. In order to quickly inform the person to be weighed of the danger and stop the backward movement, it is preferable that the notification method emits not only light but also sound.

When the weight is measured, that is, when the third total value S3 is stable for a predetermined time, the front-rear ratio R1 may be used as a reference. Considering the preliminary motion for moving from the stationary state at the time of measurement, a judgment value is provided, and when the front-rear ratio R1 decreases by the judgment value or more (for example, 0.01 to 0.1), it is judged that the vehicle is retreating. may be configured.

(control flow)
FIG. 5 shows an example of the control flow of the weight scale 100. As shown in FIG.

As shown in FIG. 5, first, in step S101, the weight scale 100 is powered on.

Next, in step S102, settings such as zero point reset and tare subtraction are performed. When the tare weight is subtracted, a numerical value for the deducted mass of clothes, wheelchairs, and the like is set.

Next, the process proceeds to step S<b>103 , and the person to be weighed gets on the weight scale 100 . When the person to be weighed is on a wheelchair, he uses the rear slope 19 and rides on the weighing platform 20 together with the wheelchair.

Next, the process proceeds to step S104, and the weighing sensors 42a to 42d measure loads.

Next, in step S105, the control unit 38 calculates the weight of the person to be weighed based on the output values W1 to W4, and causes the display screen 34 to display the weight. The output values W1 to W4 that have been stabilized for a predetermined period of time are fixedly displayed on the display screen 34 as fixed values.

Next, the process proceeds to step S106, and the movement direction detection unit 39 determines whether or not the front-rear ratio R1 has decreased from step S105. In other words, it is determined whether or not the person to be weighed on the weighing platform 20 has retreated on the tread surface. Specifically, the sum of the output values of the pair of measurement sensors 42a and 42c on the front side (first total value S1) is changed to the sum of the output values of the pair of measurement sensors 42b and 42d on the rear side (second total value S2 ) is subtracted to calculate a difference value, which is then divided by the sum of all output values (third total value S3). Using the front-to-rear ratio R1 in step S105 as a reference, if the front-to-rear ratio R1 increases, the person to be weighed has moved forward, and if the front-to-back ratio decreases, the person to be weighed has retreated. If the front-to-rear ratio R1 has decreased, it is determined that the person to be weighed is moving backward, and the process proceeds to step S107. If the front/rear rate R1 has not decreased, the weighing flow ends. It may be determined that the vehicle is in reverse when the front-to-rear ratio R1 has decreased by a predetermined value or more.

When the front-to-rear ratio R1 decreases, the process proceeds to step 107, and the notification unit 37 immediately notifies danger by sound or light.

The weighing scale 100 configured as described above detects the moving direction of the person to be weighed on the weighing platform 20 after being weighed, and notifies the person of danger when the person to be weighed retreats from the tread surface.

Scales larger than household scales, such as the scale 100, are mainly used in medical settings, nursing homes, and the like. often Since the weight of the person to be weighed is measured, the person to be weighed stands alone on the tread surface of the weighing platform 20 and stands still. After the weighing, if the person to be weighed retreats on the tread surface of the weighing platform, the person to be weighed descends down the slope without being able to see his/her feet, which is very dangerous because there is a possibility of falling. In addition, in nursing care facilities, there are cases in which residents measure their weight in groups. There is also the danger of being lost. Especially when the weigh-in person is in a wheelchair, if the weigh-in person moves backwards onto the slope, the person will slide down the slope. You may end up rear-ending another person with your car on, which increases the danger. Weight scale 100 detects the backward movement of the person to be weighed, thereby suppressing the occurrence of the above accident.

The direction of movement can be known as it is in the flow of measuring the weight, and the timing of determination after weight measurement can also be known from the output value. Safety can be ensured in the weight measurement that the person to be weighed must move by himself.

The moving direction of the person to be weighed is detected using the weighing sensor 42 for measuring the weight, and the moving direction can be easily known without adding special equipment. The weight scale 100 can also be configured by adding the moving direction detector 39 to a conventional weight scale equipped with four weighing sensors. It is also possible to retrofit the movement direction detector 39 as a program to an existing weight scale, so that the backward movement detection function can be easily implemented at low cost rather than introducing a dedicated device. By notifying the person when the backward movement is detected, the risk of injury or accident caused by the backward movement of the person to be weighed can be suppressed.

(test data)
FIGS. 6 to 8 show data obtained by actually conducting a test and getting on and off the weighing scale 100 while the person to be weighed is in a wheelchair. As a comparison test, both the case where the person to be weighed moved forward on the tread after weighing and the case where the person to be weighed retreated were conducted, and data was acquired.

FIG. 6 is a graph showing the output values W1-W4 of the weighing sensors 42a-42d obtained by testing. The horizontal axis indicates elapsed time. FIG. 6(A) shows a case where the person to be weighed moves forward from the back of the weight scale 100, climbs onto the weighing platform 20 from the rear slope 19, measures the weight, and after the measurement, moves forward and descends from the front slope 18. measurement data. FIG. 6B shows measurement data when the person to be weighed climbs onto the weighing platform 20 from the rear slope 19 of the weight scale 100, measures the weight, retreats from the tread surface after the measurement, and then descends from the rear slope 19 onto which the person is weighed. is.

FIG. 7 shows the first total value S1 and the second total value S2 calculated based on the output values W1 to W4 obtained in FIG. In FIGS. 6(B) and 7(B), the dashed line indicates the start of backward movement.

FIG. 8 shows the front/rear rate R1 calculated based on the data acquired in FIG. Both cases of weighee advance and weighee retreat are shown together in one graph. The ratio R1 before and after weighing and time are used as references. The longitudinal ratio R1 on the vertical axis is expressed in percentage.

As shown in FIG. 6, when the person to be weighed moves forward from behind the weight scale 100 and climbs onto the weighing platform 20 from the rear slope 19, the weight sensors 42a to 42d start measuring the load. Since the robot climbs onto the weighing platform 20 from behind, the output values W2 and W4 of the pair of weighing sensors 42b and 42d arranged on the rear side of the weighing platform 20 are detected to be large at first. Although the output values W1 to W4 fluctuate immediately after the start of measurement, the output values W1 to W4 converge as the person to be weighed stands still on the tread surface of the weighing platform 20. FIG. When the measurement value of the weighing sensor 42 is stabilized for a predetermined time, the weight of the person to be weighed is calculated based on the value and displayed on the display screen 34 .

As shown in FIG. 7A, when the person to be weighed moves forward to get off the front slope 18 of the weighing platform 20 after weighing, the pair of weighing sensors 42a and 42c provided on the front side of the weighing platform 20 output The value of the first total value S1, which is the total value, increases, and the second total value S2, which is the total output value of the pair of weighing sensors 42b and 42d provided on the rear side, decreases.

On the other hand, as shown in FIG. 7B, when the person to be weighed retreats from the rear slope 19 of the weighing platform 20 after weighing, the first total value S1 decreases, and the second total value S2 To increase.

As shown in FIG. 8, the front-to-rear ratio R1 continues to increase when the person to be weighed moves forward, and continues to decrease when the person to be weighed moves backward, with reference to the time of weight measurement.

(Modification)
In the present embodiment, the direction in which the pole 30 is installed is the front, and the person to be weighed climbs onto the weighing platform 20 from behind and gets off from the front, but is not limited to this. From the layout of the place where the weight scale 100 is installed, even if the direction of travel is reversed and the user climbs onto the weighing platform 20 from the front slope 18 and descends from the rear slope 19, the user will not be able to move backwards (trying to descend from the front slope 18 that has been climbed on). behavior) can be detected. In this case, the entry direction is automatically determined from the input unit 36 or the output values W1 to W4. In this case, the moving direction detection unit 39 determines that the person to be weighed moves forward when the front-to-back ratio R1 decreases after weighing, and determines that the person to be weighed moves backward when the front-to-back ratio R1 increases.

Preferred embodiments and modifications of the present invention have been described above, but the above embodiments are examples of the present invention, and it is possible to combine them based on the knowledge of those skilled in the art. Included within the scope of the invention.

20: Weighing platform 38: Control unit 39: Moving direction detection unit (detection unit)
42: Weighing sensor 100: Weight scale S1: First total value S2: Second total value S3: Third total value
R1: Before and after rate (ratio)
W1 to W4: Output value

Claims (3)

a rectangular weighing platform on which the person to be weighed is placed;
Weighing sensors arranged at the four corners of the weighing platform;
a control unit that calculates the weight value of the person to be weighed based on the output value of the weight sensor;
A large weighing scale that allows the person to be weighed to move on the tread surface of the weighing platform,
a first total value of the output values of the pair of weighing sensors arranged on the front side of the weighing platform and a second total value of the output values of the pair of weighing sensors arranged on the rear side of the weighing platform; a detection unit that detects the moving direction of the person to be weighed based on a third total value of the output values of all of the weighing sensors, and notifies the person when backward movement is detected;
A large weighing scale comprising: When the ratio of the value obtained by subtracting the second total value from the first total value and the third total value decreases by a predetermined value or more after the third total value is stabilized for a predetermined time , determines that the vehicle is moving backward and notifies the vehicle,
The large scale according to claim 1, characterized in that: A large weighing scale that allows the person to be weighed to move on the tread surface of the weighing table, in which weighing sensors are arranged at the four corners of a rectangular weighing platform on which the person to be weighed is placed, detects and notifies that the person to be weighed is moving backward. a method for
a first total value of the output values of the pair of weighing sensors arranged on the front side of the weighing platform and a second total value of the output values of the pair of weighing sensors arranged on the rear side of the weighing platform; calculating a third total value of the output values of all the weighing sensors;
After the third total value is stabilized for a predetermined time, the moving direction is detected from the ratio of the first total value minus the second total value and the third total value, and the ratio is equal to or greater than a predetermined value. If the
A method for detecting and notifying the retreat of a person to be weighed, characterized by:

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