KR20070081476A - Treadmill Automatic Speed Control Device and Its Control Method - Google Patents

Abstract

The present invention relates to an automatic speed regulating device for a treadmill and a method for adjusting the treadmill. The front load sensor and the rear load sensor are respectively installed at the front and the rear of the track belt to measure the load of the user who is exercising on the track belt. Calculating the movement position of the user on the track belt from the values measured by the sensor and the rear load sensor, respectively, to accelerate when the user is located in front of the track belt and to decelerate when the user is located behind the track belt. By controlling the drive unit, even if the user does not separately control the moving speed of the track belt while walking or running on the track belt, the moving speed of the track belt can be automatically and precisely adjusted according to the walking or running speed of the user. Treadmill Automatic Speed Control Device There is provided a method.

Description

Automatic speed control device of treadmill and its control method {AUTOMATIC SPEED CONTROL APPARATUS FOR TREADMILL AND CONTROL METHOD THEREOF}

1 is a perspective view showing the configuration of a treadmill according to an embodiment of the present invention

Figure 2 is an exploded perspective view of the track portion of Figure 1

3 is an enlarged view of portion 'A' of FIG.

4 is a perspective view of the track portion from which the track belt of FIG. 1 is removed from the bottom;

5 shows the distribution of the load sensor on the track belt of FIG.

6 is an exploded perspective view of the front load sensor module of FIG.

7 is an enlarged view of a portion 'B' mounted with the rear load sensor module of FIG.

8 is an enlarged view of a portion 'C' mounted with the front load sensor module of FIG.

9 is a control circuit diagram using the load sensors of FIG.

10 is a flow chart for explaining the operating principle of FIG.

** Description of symbols for the main parts of the drawing **

100: treadmill 110: track portion

111: track belt 112: drive roller

113: Deck 114: Frame

114a: Deck support 115: Dustproof rubber

116: deco cover 117: support roller

118: support 120: control panel

121: control panel 122: handle

123: horizontal support 124: connecting member

161a, 162a, 163a: first contact 161b, 162b, 163b: second contact

171a and 171b: first rear load sensor 172a and 172b: second rear load sensor

173a, 173b: third rear load sensor 181a, 181b: first front load sensor

182a, 182b: second front load sensor 183a, 183b: third front load sensor

190: load sensor module 191: coupling member

192: bending member R01-R03: rear load sensor resistance value

R11-R13: Front load sensor resistance values DELTA V, DELTA V1, DELTA V2, DELTA V3: Bridge voltage difference

ΔVref: Reference bridge voltage difference △ Vset: Set bridge voltage difference

The present invention relates to a treadmill automatic speed control device and a method for adjusting the treadmill, and more particularly, the user's walking or running movement, even if the user does not separately control the movement speed of the track belt while walking or running on the track belt. The present invention relates to an automatic speed adjusting device of a treadmill for precisely adjusting the moving speed of a track belt according to a speed, and a method of adjusting the same.

The treadmill is a treadmill, which is called a treadmill, and is widely used in homes and sports centers because it can bring a walking or running effect in a narrow space by using a belt that rotates in an infinite track. Treadmills can walk or run indoors at a moderate temperature even in winter, and the running speed can be arbitrarily adjusted, so the demand is increasing day by day.

In general, a user uses a treadmill to walk or run while changing walking speed or running speed according to his / her taste in order to alleviate boredom during the walking or running exercise. Since the belt speed adjustment has to be operated every day, it is not only cumbersome but also causes a problem that the balance is disturbed during exercise.

In addition, when the movement speed of the track belt of the treadmill is manipulated according to a predetermined program, the walking or running speed may not be adjusted according to the user's physical condition or condition due to the restriction of exercising according to the uniformly programmed speed. There was a problem that forced or inefficient exercise is forced.

To this end, the "automatic speed control device of the running machine" devised by Chae Young-jin and disclosed in the Republic of Korea Patent Publication No. 2003-0069941 is an optical sensor (13, 14) consisting of a light emitting part and a light receiving part in front of the control panel of the treadmill. By detecting the position of the user on the track belt in front and rear of the track belt of the treadmill, respectively, by the optical sensor, when the user is located in front of the track belt to accelerate the movement speed of the track belt, When located at the rear of the track belt is configured to reduce the moving speed of the track belt, it is configured to automatically adjust the moving speed of the track belt. However, the optical sensor used in Chae Youngjin's "Treadmill Automatic Speed Control" itself is very expensive, so if Chae Youngjin's automatic speed control device is applied to the treadmill, the manufacturing cost of the treadmill will increase significantly and the competitiveness of the product will increase. There was a problem that greatly fell.

On the other hand, the automatic speed control device of the treadmill applying the optical sensor has a limitation that can involve very high manufacturing cost, there has been an attempt to detect the user's position using the ultrasonic sensor. That is, by positioning the ultrasonic sensor in front and accelerating the moving speed of the track belt when the distance from the ultrasonic sensor is closer to the user, and reducing the moving speed of the track belt when the distance from the ultrasonic sensor is farther away from the user, The movement speed of the track belt is automatically adjusted. However, when the ultrasonic sensor is used as described above, measurement accuracy is very low and it is difficult to accurately determine the position of the user. Therefore, there is a problem that the track belt is accelerated or decelerated even when the user is not located in front of the track belt. .

In addition, when a sensor for detecting a user's position is located in front of the treadmill, the user may quickly recognize that the user moves to the front part of the track belt by running the hand as a movement during walking or running or reaching for a control panel. However, there is a problem that causes a malfunction that accelerates the movement speed of the track belt even though the user is not running fast.

The present invention has been made to solve the above problems, even if the user does not manipulate the movement speed of the track belt while walking or running on the track belt, according to the user's walking or running movement speed of the track belt automatically It is an object of the present invention to provide a treadmill automatic speed control device for precisely adjusting the moving speed and a control method thereof.

In addition, another object of the present invention is to enable a cheap manufacturing of the automatic speed control device of the treadmill for automatically adjusting the moving speed of the track belt.

In addition, the present invention senses the position of the user on the track belt by using a load sensor, when the user is determined to be located in front of the track belt, the running speed of the user is considered to be faster than the movement speed of the track belt track When the speed of the belt is accelerated and the user is judged to be in a position behind the track belt, the treadmill's automatic speed is reduced so that the running speed of the user is considered to be slower than the speed of the track belt. Another object is to provide a speed regulating device.

It is also an object of the present invention to prevent the acceleration or deceleration too sensitively depending on the position of the user on the track belt, to provide the user with a stable automatic running speed adjustment environment.

The present invention provides a treadmill having a track belt rotating in an endless track and a drive unit for driving the track belt, in order to achieve the above object, to measure the load of the user exercising on the track belt; A plurality of front load sensors installed in front of the track belt; A rear load sensor mounted to the rear of the track belt to measure a load of a user exercising on the track belt; A control unit for controlling the driving unit to accelerate or decelerate according to values measured by the front load sensors and the rear load sensors, respectively; It provides an automatic speed control device of the treadmill, characterized in that configured to include.

It calculates the position of the user who is exercising on the track belt through the load values measured by the load sensors to control the drive unit, so that the user separately manipulates the movement speed of the track belt while walking or running on the track belt. Even if not, it is to be able to automatically adjust the movement speed of the track belt according to the user's walking or running speed.

Here, after the control unit calculates the movement position of the user on the track belt from the values measured at the front load sensors and the rear load sensor, respectively, the controller accelerates when the user is located at the front portion on the track belt. Is located at the rear side on the track belt, the drive is controlled to decelerate.

The control unit increases the degree of acceleration as the value of the load sensor biased in front of the plurality of front load sensors increases, and decreases the degree of acceleration as the value of the load sensor biased in the rear of the plurality of front load sensors increases. Adjust That is, if the user is biased in the front part of the track belt while the user is walking or running on the track belt, the load value measured from the foremost load sensor among the front load sensors becomes larger, and the user Sloped at the rear portion of the front load sensors, the load value measured from the rearmost load sensor is further smaller, it is possible to adjust the running speed of the track belt based on the measured load value.

The front load sensor and the rear load sensor are each formed of one or more load cells. The load cell is composed of one or more strain gauges whose electrical resistance changes in proportion to the amount of deformation or compression as they are loaded from the outside.The voltage value around the strain gauge changes as the electrical resistance of the strain gauge changes. The sensor calculates the deformation amount of the strain gauge from this, and measures the load applied from the outside in consideration of the physical properties of the material to which the strain gauge is attached. Accordingly, the front load sensor and the rear load sensor formed of a load cell output different voltage values according to the degree of the user's bias toward the front part or the rear part of the track belt, and the output voltage values are respectively converted into an amplifier and an analog-digital converter. Each load value can be measured via.

For example, when the user is biased in the front part of the track belt, the load F1 measured by the foremost front load sensor among the front load sensors formed of the load cell has an absolute value as compared to the case where the user is located in the center of the track belt. As a result, the user is inclined to the front part of the track belt, thereby giving a control command to accelerate the movement speed of the track belt. Similarly, if the user is biased at the rear part of the track belt, the load F2 measured by the rearmost front load sensor among the front load sensors formed of the load cell becomes larger than the case where the user is located at the center of the track belt. Thus, the user is inclined to the rear portion of the track belt, thereby giving a control command to slow down the movement speed of the track belt.

In contrast, the front load sensor and the rear load sensor may be formed of a strain gauge. At this time, two strain gauges are formed for the front load sensor and the rear load sensor, respectively, and each of the front load sensors and the rear load sensor may form a complete Wheatstone bridge circuit, or two for each of the front load sensor and the rear load sensor. The strain gage for the sensor and the strain gage for the rear load sensor may be combined to form a Wheatstone bridge circuit.

However, when the load sensors are each formed of a pair of strain gauges, the front load sensors are formed at the positions of the plurality of track belts with one strain gauge on the left and right sides of the front part of the track belt, respectively, and the rear load The sensors are formed at fixed positions at the left and right sides of the rear portion of the trek belt, forming a whistle bridge in which the strain gauges of the front load sensor and the strain gauges of the rear load sensor face each other, so that their bridge voltage difference You can also find out where the user is.

When the front load sensor and the rear load sensor are formed of two strain gauges, and the Wheatstone bridge is formed so that the strain gauge for the front load sensor (resistance value R1) and the strain gauge for the rear load sensor (resistance value R0) face each other. If the applied power supply is V, the bridge voltage difference ΔV is expressed by the following equation.

Therefore, three front load sensors and three rear load sensors are formed, and the resistance values of the front load sensors are sequentially called R11, R12, and R13 from those located at the forefront, and the resistance value of the lower shelf load sensor is Ro (rear load). When the sensors are all formed at the same position, the six resistance values Ro of the rear load sensor all have almost the same value, so all six resistance values of the rear load sensor may be referred to as Ro). The respective bridge voltage differences DELTA V1, DELTA V2 and DELTA V3 between the sensor and the front load sensor are expressed as follows.

Therefore, when the user is biased toward the front part of the track belt, the R11 value becomes larger, and when the user is biased toward the rear part of the track belt, the R13 value becomes larger, and the sign of the bridge voltage difference? V1 to? V3 The magnitude of the and absolute values allows the user to accurately detect whether the user is biased forward or backward, and to what extent. Through this, by accelerating or decelerating the driving speed of the driving unit for driving the track belt, it is possible to implement an automatic speed control device that is automatically accelerated or decelerated even without user's manipulation. At this time, the resistance values (Ro, R11, R12, R13) of the strain gauges for the front load sensor and the strain gauges for the rear load sensor all have the same resistance value. Since the sign of ΔV is converted, it is preferable in view of ease of control.

When the user runs faster on the track belt, the user is biased toward the front part on the track belt. Since the bridge voltage difference ΔV1 of the Wheatstone bridge increases and decreases in proportion to the degree of deviation of the user, The amount of acceleration and deceleration of the drive speed of the driver is adjusted in proportion to the bridge voltage difference ΔV of the Wheatstone bridge.

At this time, in order to prevent malfunction due to too high sensitivity in the control of the acceleration and deceleration, the movement speed of the track belt is not accelerated or decelerated when the user is not biased forward or rearward by a predetermined amount. Instead, the movement speed of the track belt may be accelerated or decelerated only when the user is biased further to the front portion or the rear portion than the predetermined amount on the track belt.

In addition, in order to prevent some strain gauges from malfunctioning, the trek belt is moved by the sign and the value of the remaining bridge voltage difference except for the maximum value and the minimum value among the bridge voltage differences ΔV 1, ΔV 2, ΔV 3. You can also adjust the speed.

In addition, the front load sensor and the rear load sensor are respectively installed on the left and right of the track belt, even if the user has a tendency to move to some extent eccentric left and right, whether the user is biased to the front or rear Can be easily detected.

After the user starts walking or running on the track belt, each bridge voltage difference is measured by measuring the loads of the front and rear portions of the track belt without accelerating or decelerating the movement speed of the track belt for a predetermined time. (ΔV1, ΔV2, ΔV3 ...) are averaged and stored as the reference bridge voltage difference ΔVref. This is because the running positions on the track belt are different for each user's inclination, so that the movement position according to the user's inclination can be accurately identified initially, and the moving speed of the track belt can be effectively adjusted according to the user's inclination. For example, if a user has a tendency to move in a slightly biased position in the front part of the track belt, even if the user is somewhat inclined in the front part of the track belt, it is already in the reference bridge voltage difference ΔVref. Since the propensity is taken into account, the speed of movement of the track belt is no longer accelerated unless the user is further biased forward.

Here, the values of the respective bridge voltage differences DELTA V1, DELTA V2, DELTA V3 ... can be calculated in real time, so that only the average value of the bridge voltage differences DELTA Vavg is used to control the movement speed of the track belt. By adjusting the degree of acceleration and the degree of deceleration according to the change amount of the bridge voltage difference (ΔV1) from the front strain gauge, the degree of bias of the user can be grasped more quickly, and according to the position on the track belt of the user More precisely, the movement speed of the track belt can be controlled. Therefore, as compared with the case of using one front strain gage and one rear strain gage, it is possible to automatically adjust the speed according to the user's intention with more precise and faster response speed.

At this time, it is controlled to accelerate or decelerate the driving speed of the driving unit according to the sign and magnitude of the average value of the bridge voltage differences between the front load sensors and the rear load sensor.

In addition, the front load sensor and the rear load sensor are installed in contact with the frame for supporting the deck placed between the upper and lower parts of the track belt so as to support the load of the user in the treadmill. That is, the front load sensor and the rear load sensor may be installed between the frame and the deck, the load of the deck to measure the amount of deformation of the frame to be installed to calculate the load from the deck therefrom It may be.

On the other hand, according to another field of the present invention, the present invention provides a method for automatically adjusting a treadmill having a track belt rotating in an infinite track and a drive unit for driving the track belt. Measuring a load of a user exercising on the track belt at one location, respectively; Determining a user's position by comparing load values measured at the front and the rear of the track belt, respectively; Accelerating a driving speed of the driver when the position of the user is located in front of the user; It provides an automatic speed control method of the treadmill, characterized in that configured to include.

At this time, by adjusting the driving speed of the drive unit by using the average value of the load values measured from the front, it is possible to automatically correct the traveling speed of the track belt even if a measurement error occurs.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration of the automatic speed control device of the treadmill according to an embodiment of the present invention.

1 is a perspective view showing the configuration of a treadmill according to an embodiment of the present invention, Figure 2 is an exploded perspective view of the track portion of Figure 1, Figure 3 is an enlarged view of the portion 'A' of Figure 2, Figure 4 is Fig. 5 is a perspective view of the track portion from which the track belt is removed from the bottom, Fig. 5 shows the distribution of the load sensor on the track belt of Fig. 1, Fig. 6 is an exploded perspective view of the front load sensor module of Fig. 4, and Fig. 7 is a rear view of Fig. 4. 8 is an enlarged view of portion 'B' mounted with a load sensor module, FIG. 8 is an enlarged view of portion 'C' mounted with the front load sensor module of FIG. 4, FIG. 9 is a control circuit diagram using the load sensors of FIG. Is a flowchart for explaining the principle of operation of FIG.

As shown in the figure, the treadmill 100 equipped with an automatic speed regulating device according to an embodiment of the present invention is a track configured to move the track belt 111 in an endless track for the user to walk or run. The unit 110, the control panel unit 120 for displaying the amount of calories consumed according to the operating speed or the exercise amount of the track belt 111 at the waist height of the user, and the load of the user exercising on the track belt 111 Control unit for controlling the moving speed of the track belt 111 on the basis of the load sensor module 190 for measuring the front and rear of the track belt 111, respectively, and the load value measured by the load sensor 190 ( Not shown).

The track unit 110 includes a track belt 111 moving in an infinite track, a driving roller 112 for guiding the movement of the track belt 111 at both ends of the track belt 111, and a driving roller 112. The deck 113 is formed to include a deck 113 formed in a plate shape so as to support a user's weight between the driving unit 112a for driving rotation, the upper and lower portions of the track belt 111, and the user's weight. The frame 114 to contact and support both sides of the deck 113, the anti-vibration rubber 115 is installed to absorb the shock between the deck 113 and the frame 114, and the frame 114 is exposed to the outside Deco cover 116 formed to cover both sides of the frame 114 with a plastic or metal material that enhances the aesthetic so as not to be, the support roller 117 for supporting the front of the treadmill 100, and the rear of the treadmill 100 It is configured to include a support 118 for supporting the part.

Here, as shown in Figure 2, the track belt 111 is installed so as to be movable in an endless track between the drive roller 112, the deck 113 is inserted between the upper and lower surfaces of the track belt 111. . In addition, both sides of the deck 113 supporting the user's weight and exercise shock are supported by a deck support 114a protruding in a 'b' shape from the frame 114. And, between the deck support (114a) and the deck 113, the anti-vibration rubber 115 is installed, to attenuate the impact load of the user to protect the user's knees and the like.

The control panel unit 120 includes a control panel 121 which displays a moving speed, a running moving distance, calories burned, etc. of the track belt 111, and a button for instructing start and stop of a walking or running exercise, and the like; The handle 122 which extends from the lower end of the control panel 121 and protrudes so that the user can hold it during exercise or emergency, and the control panel 121 is vertically fixed upright from the track 110 so that the control panel 121 is installed at the waist level of the user. And a horizontal support 123 connecting between the member 124 and the connecting member 124 to reinforce the lateral rigidity of the connecting member 124. However, since the moving speed of the track belt 111 is automatically adjusted according to the intention of the user, a separate speed control button is not formed on the control panel 121.

The load sensor module 190 is respectively installed in the front and rear portions of the deck 113 to measure the load transmitted to the deck 113, the coupling member 191 protruding laterally from the frame 114 And a bending member 192 coupled to the coupling member 191 and formed to an appropriate thickness such that an appropriate amount of bending deformation occurs by a load from the deck 113, and attached to the bottom surface of the bending member 192 to be in the elastic region. And strain gages 171a-173b and 181a-183b which are bent and deformed together with the bending member 192 to change the resistance thereof.

At this time, the strain gauge module with one strain gauge (181a-183a, 181b-183b) attached to the front of the deck 113 is mounted at different front positions on both sides of the track belt 111, and the deck ( At the rear portion of 113, strain gauge modules equipped with three strain gauges 171a-173a and 171b-173b are mounted on both sides of the track belt 111. Here, the strain gauges 171a-173a and 171b-173b attached to the rear portion of the deck 113 are attached to the bending members 192 side by side in the width direction, and three pairs of bending deformations of the bending members 192 are performed. Strain gauges 171a-173a and 171b-173b are provided to have the same resistance value.

The coupling member 191 and the bending member 192 are firmly fixed to be integrally deformed by a fastening means such as a bolt in a state where the four fastening holes 191a and 192a overlap each other. Further, another through hole 192b of the bending member 192 communicates with a through hole formed in the center of the anti-vibration rubber 115 and is used to fix the anti-vibration rubber 115.

As shown in Fig. 9, the control unit has a pair of strains having values of resistance values R11, R12, and R13 so as to measure the load of the front part by position L1, L2, and L3 of the track belt 111, respectively. The gauges 181a-183a and 181b-183b and three pairs of strain gauges 171a-173a and 171b-173b having resistance values R01, R02 and R03 to measure the load of the rear portion of the track belt 111 are mutually different. The first contact 161a-163a and the first contact between the Wheatstone bridge formed to face each other, and the front strain gauges 181a-183a and 181b-183b and the rear strain gauges 171a-173a and 171b-173b of the Wheatstone bridge. And an amplifier for amplifying the bridge voltage differences DELTA V1, DELTA V2, and DELTA V3 respectively between the two contacts 161b to 163b, and an analog / digital converter for converting the amplified signal into a digital signal. Then, the digital signal converted through the analog-to-digital converter is transmitted to the controller, and the moving speed of the track belt 111 is adjusted by adjusting the driving speed of the driving unit 112a.

At this time, when the power supply (POWER SUPPLY) is applied to the Wheatstone bridge, respectively, the first between the front strain gauges (181a-183a, 181b-183b) and the rear strain gauges (171a-173a, 171b-173b). The bridge voltage difference DELTA V1, DELTA V2, DELTA V3 between the contacts 161a-163a and the second contacts 161b-163b is expressed by Equations 2 to 4 as described above.

Therefore, when the user is biased toward the front part or the rear part of the track belt 111, the strain gauge provided on the biased side becomes larger than the resistance value of the strain gauge on the unbiased side, so that the sign of ΔV is Depends on the direction of eccentricity. In addition, the greater the bias toward either side, the larger the resistance value of the strain gauge on the biased side, while the resistance value of the non-biased strain gauge becomes relatively smaller, so that the absolute value of ΔV in proportion to the bias Will change. Therefore, the automatic speed adjusting device of the treadmill according to the embodiment of the present invention is configured to accelerate or decelerate the moving speed of the track belt 111 according to the sign of ΔV and the magnitude of the absolute value.

In this case, the front strain gauges 181a-183a and 181b-183b and the rear strain gauges 171a-173a and 171b-173b are preferably formed to have the same resistance value. However, it may have any resistance value such as 120Ω or 350Ω.

Hereinafter, with reference to Figure 10 will be described the operation principle of the automatic speed regulating device of another treadmill 100 in an embodiment of the present invention configured as described above.

When the position on the user's track belt 111 is out of the range, acceleration / deceleration is converted into a bridge voltage difference ΔV and input to the controller as an initial set value ΔVset. At this time, the initial set value DELTA Vset is set based on the average values of the respective bridge voltage differences DELTA V1, DELTA V2, and DELTA V3.

Then, when the user goes up the track belt 111 and presses the exercise start button and starts a walking or running exercise, the movement speed of the track belt 111 is automatically adjusted for a predetermined time of about 10 seconds to about 1 minute after the start of the exercise. Without accelerating and decelerating, the load is measured with the load sensor module 190 at the front part and the rear part of the track belt 111, respectively. Through this, the user who is currently running on the track belt 111 determines which position on the track belt 111 has a tendency to run. Specifically, the average value of the bridge voltage differences DELTA V1, DELTA V2, and DELTA V3 of the Wheatstone bridge circuit shown in FIG. 9 for about one minute after the start of the exercise is obtained and stored as an acceleration / deceleration reference bridge voltage difference DELTA Vref. Put it.

Then, when the user runs faster and the user's body is inclined to the front part of the track belt 111, the bending member 192 to which the user's foremost strain gauges 181a and 181b are attached is located at the rear. Since more bending deformation occurs than the bending member 192 to which the strain gauges 183a and 183b are attached, the resistance value R11 of the strain gauges 181a and 181b at the foremost part is applied to the strain gauges 183a and 183b at the rear thereof. On the contrary, since the bending member 192 provided in the rear hardly causes bending deformation, the resistance values R01, R02, and R03 of the rear strain gauges 171a-173a, 171b-173b hardly change. Therefore, according to the equations (2) to (4), ΔV1, ΔV2, and ΔV3 have a sign of (−), and the absolute value thereof increases as the user shifts the front part of the track belt 111. That is, the absolute value of DELTA V1 becomes larger than the absolute value of DELTA V3. At this time, if the average value of ΔV1, ΔV2, and ΔV3 is ΔVavg, when the absolute value of (ΔVavg-ΔVref) exceeds the absolute value of the initial setting value ΔVset, the user may move forward. Since the negative bias is the bias set by the initial set value (ΔVset), the command to accelerate the movement speed of the track belt 111 is proportional to the magnitude of the absolute value of (ΔVavg-ΔVref) to the controller. By transmitting, the user's position on the track belt 111 is sensed without the user's separate operation, thereby accelerating the moving speed of the track belt 111.

Similarly, when the user's body is inclined to the rear part of the track belt 111 as the running speed is slowed while the user is tired during exercise, the bending members 192 to which the front strain gauges 181a and 181b of the user are attached. ), Smaller bending deformation occurs than the bending member 192 with the strain gauges 183a and 183b attached to the rear thereof, so that the resistance value R11 of the strain gauges 181a and 181b at the foremost portion of the strain gauges While smaller than 183a and 183b, the bending member 192 provided at the rear hardly causes bending deformation, so that the resistance values R01, R02, and R03 of the rear strain gauges 171a-173a, 171b-173b become larger. . Therefore, according to the equations (2) to (4), the sign DELTA V1, DELTA V2, DELTA V3 becomes positive (+), and the absolute value decreases as the user shifts the front part of the track belt 111. That is, the absolute value of DELTA V1 becomes smaller than the absolute value of DELTA V3. At this time, if the average value of ΔV1, ΔV2, and ΔV3 is ΔVavg, when the absolute value of (ΔVavg-ΔVref) exceeds the absolute value of the initial setting value ΔVset, the user is rearward. Since the negative bias is the bias set by the initial set value (ΔVset), the control unit sends a command to reduce the moving speed of the track belt 111 in proportion to the magnitude of the absolute value of (ΔVavg-ΔVref). By transmitting, the position of the user's track belt 111 is sensed even if there is no separate operation by the user, thereby reducing the moving speed of the track belt 111.

Here, the acceleration and deceleration of the track belt 111 are set so as to be proportional to the magnitude of the absolute value of (ΔV1-ΔVavg) or the magnitude of the absolute value of (ΔV3-ΔVavg).

On the other hand, the average value of the bridge voltage difference ΔV2 in the middle portion is excluded except for the front and rear ΔV1 and ΔV3 without controlling the moving speed of the track belt 111 around ΔVavg which is the average value of all bridge voltage differences. It is also possible to control the movement speed of the track belt 111 alone.

At this time, whether to accelerate or decelerate the movement speed of the track belt 111 depends on the sign of (ΔVavg−ΔVref).

The adjustment of the movement speed of the track belt is continued until the user's running movement ends.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope described in the claims.

That is, in one embodiment of the present invention, the load sensor module 190 has been described as an example installed between the deck 113 and the frame 114, the deck support portion (a) of the '114' shape of the frame 114 It is also within the scope of the present invention to determine the position of the user by attaching strain gauges to invert the load from the deformation amount of the frame 114 itself.

In addition, in identifying the position of the user on the track belt 111, it has been described with an example including the step of identifying which position on the track belt 111 according to the user's inclination, as an example, except that the track belt 111 Can be controlled immediately in accordance with the sign and magnitude of the bridge voltage difference ΔV. And in order to suppress the sensitivity which detects acceleration / deceleration too much, the initial setting which does not perform the acceleration / deceleration adjustment of the track belt 111 when the absolute value of the bridge voltage difference (DELTA) V is smaller than a predetermined value. Although the value? Vset has been illustrated to be set, this may be selectively applied. In this case, since the moving speed of the track belt 111 is accelerated and decelerated in the absence of the initial set values of ΔVref and ΔV, the moving speed of the track belt is adjusted only by the absolute value and the sign of ΔV.

As described above, the present invention provides a plurality of front load sensors and rear load sensors in front and rear of the track belt, respectively, to measure the load of the user exercising on the track belt, the plurality of front load sensors and the rear By calculating the position of movement of the user on the track belt from the values measured at each load sensor, by controlling the drive unit to accelerate when the user is located in front of the track belt and to decelerate when the user is located behind the track belt. The automatic speed of the treadmill can adjust the speed of the track belt automatically and precisely according to the speed of the user's walking or running movement, even if the user does not separately control the speed of the track belt while walking or running on the track belt. It provides an adjusting device and a method of adjusting the same.

In addition, the present invention can be implemented inexpensively implement a treadmill automatic speed control device that can automatically adjust the movement speed of the track belt by forming the front load sensor and the rear load sensor with a low-cost strain gauge.

In addition, the present invention by using the user's load on the track belt to determine the biased position on the track belt by adjusting the movement speed of the track belt, so that the signal for the user position is not distorted by the user's hand movements, etc. It provides an automatic speed control device of the treadmill to implement the acceleration or deceleration having.

Claims (12)

A treadmill comprising a track belt rotating in an endless track and a drive unit for driving the track belt, A plurality of front load sensors installed in front of the track belt to measure a load of a user exercising on the track belt; A rear load sensor mounted to the rear of the track belt to measure a load of a user exercising on the track belt; A control unit for controlling the driving unit to accelerate or decelerate according to values measured by the front load sensors and the rear load sensors, respectively; Automatic speed control device of the treadmill, characterized in that configured to include. The method of claim 1, The control unit increases the degree of acceleration as the value of the load sensor biased in front of the plurality of front load sensors increases, and decreases the degree of acceleration as the value of the load sensor biased in the rear of the plurality of front load sensors increases. Automatic speed control device of the treadmill, characterized in that for adjusting. The method of claim 1, The control unit calculates the movement position of the user on the track belt from the values measured by the front load sensor and the rear load sensor, respectively, and accelerates when the user is located in front of the track belt. The speed control device of the treadmill, characterized in that for controlling the drive unit to decelerate. The method of claim 1, The rear load sensor is a plurality of automatic speed adjusting device of the treadmill, characterized in that formed. The method according to any one of claims 1 to 4, And the front load sensor and the rear load sensor are load cells or strain gauges. The method of claim 5, The front load sensor and the rear load sensor are formed of a strain gauge having the same resistance value, The front load sensors are each formed of two strain gauges on the same traveling position (L1, L2 ...) of the track belt, and the rear load sensors are also formed of two strain gauges, Two strain gauges forming the front load sensor and two strain gauges forming the rear load sensor each forming a Wheatstone bridge facing each other; And measuring the bridge voltage difference between the front load sensors and the rear load sensor to adjust the driving speed of the driving unit according to the measured bridge voltage difference. The method of claim 6, And a driving speed of the drive unit is accelerated or decelerated according to a sign of an average value of bridge voltage differences between the front load sensors and the rear load sensors. The method of claim 6, And an acceleration / deceleration degree of a driving speed of the driving unit according to an average value of bridge voltage differences between the front load sensors and the rear load sensor. The method according to any one of claims 1 to 4, A deck formed to support a load of a user between the track belts; A frame supporting the deck; And the front load sensors and the rear load sensors are installed in contact with the frame to measure the load of the user applied to the deck. The method of claim 9, And the front load sensors and the rear load sensors are installed between the deck and the frame. An automatic speed adjusting method of a treadmill having a track belt rotating in a caterpillar and a drive unit for driving the track belt, Measuring a load of a user exercising on the track belt at a plurality of locations in front of the track belt and at one location in the rear of the track belt; Determining a user's position by comparing load values measured at the front and the rear of the track belt, respectively; Accelerating a driving speed of the driver when the position of the user is located in front of the user; Automatic speed control method of the treadmill, characterized in that configured to include. The method of claim 11, Automatic speed control method of the treadmill, characterized in that for controlling the drive speed of the drive unit by using the average value of the load values measured from the front.

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