KR100737394B1 - Automatic speed control apparatus for treadmill and control method thereof - 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, the treadmill can automatically adjust the moving speed of the track belt according to the walking or running speed of the user, even if the user does not separately control the moving speed of the track belt while walking or running on the track belt. Automatic speed control device and its control method The ball.

Treadmill, Force Sensor, Strain Gauge, Automatic Speed Control

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 an exploded perspective view of the load sensor module of FIG.

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

6 is an enlarged view of a portion 'B' of FIG.

7 is a control circuit diagram using the load sensor of FIG.

8 is a flow chart for explaining the principle of operation 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

190: load sensor module 191: coupling member

192: bending member 193a, 193b: rear load sensor

194a, 194b: Front load sensor R1: Rear load sensor resistance value

R2: Resistance value of the front load sensor 181: First contact

182: second contact ΔV: bridge voltage difference

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

The present invention relates to a treadmill automatic speed adjusting device and a method of adjusting the treadmill, and more particularly, a deck for supporting a user, even if the user does not separately control the moving speed of the track belt while walking or running on the track belt. The treadmill, which measures the load transmitted through the front and rear parts of the track belt and detects the user's position on the track belt from the difference, automatically adjusts the movement speed of the track belt according to the speed of the user's walking or running movement. It relates to an automatic speed control device and a control method thereof.

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 behind the track belt, it is configured to decelerate the moving speed of the track belt and 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 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 is a treadmill having a track belt rotating in an infinite track and a drive unit for driving the track belt, in order to achieve the object described above, the track to measure the load of the user exercising on the track belt A front load sensor installed in front of the 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; It provides an automatic speed control device of the treadmill including a control unit for controlling to accelerate or decelerate the drive unit by the values measured in the front load sensor and the rear load sensor, respectively.

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, 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 the front portion on the track belt and the user Located in the rear part on the track belt, the drive unit is controlled to decelerate.

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 front load sensor formed of the load cell becomes larger than the case where the user is located in the center part of the track belt. Since it is biased in the front part of the belt, a control command is issued to accelerate the movement speed of the track belt. Similarly, when the user is biased at the rear of the track belt, the load F2 measured by the rear load sensor formed of the load cell becomes larger than the case where the user is located at the center of the track belt, so that the user Since it is biased in the rear part, a control command is issued 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. In this case, four strain gauges may be formed in the front load sensor and the rear load sensor, respectively, and may constitute a complete Wheatstone bridge circuit like the load cell, respectively. Two strain gauges may be formed in the front load sensor and the rear load sensor. The strain gauges for the rear load sensor and the strain gauges for the rear load sensor may be combined to form a Wheatstone bridge circuit.

That is, the front load sensor and the rear load sensor are each formed of one strain gauge at the left, right side of the front part of the track belt, and the left and right side of the rear part, and they form a bridge bridge facing each other to form one bridge voltage. You can also find out where you are by car. Through this, it is possible to derive the change in the resistance value of the strain gauge measured in four places as one bridge voltage difference, so that even if only one relatively expensive amplifier is installed, the user's position can be accurately determined.

When the front load sensor and the rear load sensor are formed of two strain gauges, and the Wheatstone bridge is formed such that the strain gauge for the front load sensor (resistance value R2) and the strain gauge for the rear load sensor (resistance value R1) face each other. If the applied power supply is V, the bridge voltage difference ΔV is expressed by the following equation.

Therefore, when the user is biased toward the front part of the track belt, the R1 value becomes larger, and when the user is biased to the rear part of the track belt, the R2 value becomes larger, so that the sign and absolute value of the value of the bridge voltage difference ΔV are increased. By the size of the user can 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 (R1, R2) of the strain gauge for the front load sensor and the strain gauge for the rear load sensor have the same resistance value. Since it 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 ΔV 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 driving 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, the front load sensor and the rear load sensor are installed on the left and right sides of the track belt, respectively, to what extent the user is eccentrically forward or rearward, even if the user has a tendency to eccentrically move left and right. Whether or not it can be easily detected.

After the user starts walking or running on the track belt, the loads of the front and rear portions of the track belt are measured and averaged, respectively, without accelerating or decelerating the movement speed of the track belt for a predetermined time. It is stored as a 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, the reference bridge voltage difference (ΔVref) Since the propensity is already taken into account, the speed of movement of the track belt is no longer accelerated unless the user is further biased forward.

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 invention, the present invention is a method for automatically adjusting the speed of a treadmill having a track belt rotating in an infinite track and a drive unit for driving the track belt, the track in front and rear of the track belt Each measuring a load of a user exercising on the belt; Averaging the measured values by measuring loads at the front and rear of the track belt for a predetermined time to determine the propensity of movement of the user; Determining a user's position by comparing load values measured at the front and the rear of the track belt, respectively; Accelerating the driving speed of the drive unit when the user's position is located in front, and providing a method for automatically adjusting the treadmill, comprising the step of decelerating the driving speed of the drive unit when the user's position is located in the rear. do.

Here, the load of the user who is exercising on the track belt is measured by the strain gauge, the strain gauge is installed in pairs in the front and rear respectively, the front of the strain gauges installed in the front and rear strain gauges facing each other A bridge is configured, and the bridge voltage difference between the front strain gauge and the rear strain gauge is measured, and the control is performed to accelerate or decelerate the driving unit according to the sign and magnitude of the bridge voltage difference.

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.

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 which is in contact with and supported on both sides of the deck 113, the anti-vibration rubber 115 provided 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.

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 193a, 193b, 194a, and 194b that are bent and deformed together with the bending member 192 to change their resistance.

Here, 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. 7, the control unit comprises a pair of strain gauges 194a and 194b having a value of the resistance value R2 so as to measure the load of the front portion of the track belt 111 and the rear portion of the track belt 111. A pair of strain gages 193a and 193b having a value of resistance R1 facing each other to measure the load, the front strain gauges 194a and 194b and the rear strain gages 193a and 194b of the Wheatstone bridge. An amplifier for amplifying the bridge voltage difference ΔV between the first contact 181 and the second contact 182 between 193b) and an analog-to-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, the bridge between the first contact 181 and the second contact 182 between the front strain gauge 194a and the rear strain gauge 193a. The voltage difference ΔV is expressed by Equation 1 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.

At this time, the front strain gauges 194a and 194b and the rear strain gauges 193a and 193b 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 8 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 track belt 111 of the user deviates to some extent, the acceleration / deceleration is converted into the bridge voltage difference ΔV and input to the controller as the initial set value ΔVset.

Then, when the user ascends 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 not automatically accelerated or decelerated for a predetermined time of about 1 minute after the start of the exercise. The load is measured by the load sensor module 190 at the front and rear portions of the track belt 111. 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 difference DELTA V of the Wheatstone bridge circuit shown in Fig. 7 is obtained for about one minute after the start of the exercise, and the average value is stored as the acceleration / deceleration reference bridge voltage difference DELTA Vref.

Then, when the user runs faster and the user's body is biased toward the front part of the track belt 111, the bending member 192 installed in front of the user is more than the bending member 192 installed in the rear. Since bending deformation occurs, the resistance value R2 of the strain gauges 194a and 194b of the front portion becomes large, whereas the bending member 192 provided to the rear hardly causes bending deformation, so that the resistance of the rear strain gauges 193a and 193b occurs. The value R1 hardly changes. Therefore, according to equation (1), ΔV becomes a negative sign, and as the user moves to the front part of the track belt 111, its absolute value increases. At this time, when the absolute value of (ΔV-ΔVref) exceeds the absolute value of the initial setting value (ΔVset), the degree to which the user is biased toward the front part is set through the initial setting value (ΔVset). Since it is biased, the command for accelerating the moving speed of the track belt 111 in proportion to the magnitude of the absolute value of (ΔV-ΔVref) is transmitted to the control unit, so that the user's track belt 111 can be operated even if there is no user's separate operation. The position of the track belt 111 is accelerated by detecting the position on 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 the exercise, the bending member 192 installed in front of the bending member 192 installed at the rear of the user Since more bending deformation occurs, the resistance value R1 of the strain gauges 193a and 193b in the rear portion increases, whereas the bending member 192 provided in the front hardly causes bending deformation, and thus the front strain gauge 194a. , Resistance value R1 of 194b) hardly changes. Accordingly, ΔV becomes (+) according to Equation 1, and the absolute value of the ΔV becomes larger as the user moves to the rear portion of the track belt 111. At this time, when the absolute value of (ΔV-ΔVref) exceeds the absolute value of the initial setting value (ΔVset), the degree to which the user is biased to the rear part is set by the initial setting value (ΔVset). Since it is biased, the command to reduce the moving speed of the track belt 111 in proportion to the magnitude of the absolute value of (ΔV-ΔVref) is transmitted to the control unit, so that the user's track belt 111 can be operated even if there is no user's separate operation. Detects the position on the track belt 111 to slow down the movement speed of the track belt 111.

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

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

In the above description of the preferred embodiment of the present invention by way of example, the scope of the present invention is not limited only to this specific embodiment, it can be appropriately changed within the scope described in the claims.

That is, in an embodiment of the present invention, for convenience of installation, the two strain gauges are formed in one pair in front and rear of the track belt 111, but the present invention has been described as one strain gauge, each of the front left side, It is also included in the present invention to be installed on the front right side, rear left side, rear right side.

And, in the 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 front load sensor and a rear load sensor in front and rear of the track belt, respectively, to measure the load of the user exercising on the track belt, respectively in the front load sensor and the rear load sensor By calculating the position of the user's movement on the track belt from the measured values, the user controls the drive 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. Treadmill's automatic speed control device and method for automatically adjusting the movement speed of the track belt according to the walking or running speed of the user, even if the movement speed of the track belt is not controlled separately while walking or running on the belt. To provide.

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 (17)

A treadmill comprising a deck, a track belt rotating in an infinite orbit along a plate surface direction of upper and lower surfaces of the deck, and a drive unit for driving the track belt, A front load sensor installed on the bottom of the deck at the front of the track belt to measure the load transmitted through the deck supporting the user on the track belt; A rear load sensor mounted on the bottom of the deck at the rear of the track belt to measure the load transmitted through the deck supporting the user on the track belt; And measuring load values transmitted from the front load sensor and the rear load sensor through the deck, respectively, and as the load value measured by the front load sensor increases, the user senses that the user is located in front of the track belt. And detecting that the user is located rearward on the track belt as the load value measured by the rear load sensor increases, and operates to accelerate and decelerate the track belt according to the position on the track belt of the user. Automatic speed control device. The method of claim 1, The automatic speed adjusting device of the treadmill accelerates when the user is located in front of the track belt and decelerates when the user is located behind the track belt. The method according to claim 1 or 2, The deck is supported by both sides of the deck support protruding from the frame of the treadmill, the front load sensor and the rear load sensor is installed on the deck support to measure the load transmitted from the deck of the treadmill Automatic speed control device. The method of claim 3, wherein And the front load sensor and the rear load sensor are load cells. A treadmill comprising a deck, a track belt rotating in an infinite orbit along a plate surface direction of upper and lower surfaces of the deck, and a drive unit for driving the track belt, A front strain gauge installed on a bottom surface of the deck of the front portion of the track belt to be deformed by a load transmitted through a deck supporting the user on the track belt; A rear strain gauge installed on a bottom of the deck at a rear portion of the track belt so as to be deformed by a load transmitted through a deck supporting a user on the track belt; And the front strain gage and the rear strain gage form a Wheatstone bridge, and detect the position of the user on the track belt from the bridge voltage difference of the Wheatstone bridge, thereby adjusting the track belt according to the position of the user. Automatic speed control device of the treadmill, characterized in that configured to operate to accelerate and decelerate. The method of claim 5, And the front strain gauge and the rear strain gauge have the same resistance value. The method according to claim 5 or 6, The automatic speed adjusting device of the treadmill accelerates when the user is located in front of the track belt and decelerates when the user is located behind the track belt. The method of claim 7, wherein And an acceleration / deceleration of the driving speed of the driving unit according to the magnitude of the bridge voltage difference of the Wheatstone bridge. The method of claim 7, wherein The treadmill further includes a frame for contacting and supporting the deck, And the front strain gauge and the rear strain gauge are attached to a bending member protruding from the frame to support the deck, and deform integrally with the bending member. A treadmill comprising a deck, a track belt rotating in an infinite orbit along a plate surface direction of upper and lower surfaces of the deck, and a drive unit for driving the track belt, Two front strain gauges installed on a bottom surface of the deck of the front portion of the track belt so as to be deformed by a load transmitted through a deck supporting a user on the track belt; Two rear strain gauges installed on a bottom of the deck at a rear portion of the track belt so as to be deformed by a load transmitted through a deck supporting a user on the track belt; And the front strain gage and the rear strain gage have the same resistance value, and form a Wheatstone bridge such that the front strain gages face each other and the rear strain gages face each other to form a bridge voltage of the Wheatstone bridge. By detecting a user's position on the track belt from a car, the automatic speedometer of the treadmill accelerates when the user is located in front of the track belt and decelerates when the user is located behind the track belt. Treadmill Automatic Speed Control. The method of claim 10, The two front load sensors are respectively installed on the left and right sides of the track belt, And the two rear load sensors are installed on the left and right sides of the track belt, respectively. An automatic speed control method of a treadmill having a deck, a track belt rotating in an endless track along a plate surface direction of the upper and lower surfaces of the deck, and a drive unit for driving the track belt, Measuring load values (F1, F2) transmitted through the deck supporting the user on the track belt at the front and rear of the track belt, respectively; As the load value measured in front of the track belt increases, the user senses that it is located in front of the track belt, thereby accelerating the driving speed of the drive unit, and as the load value measured behind the track belt increases, the user A speed adjusting step of sensing the rear side of the track belt to reduce the driving speed of the driving unit; Automatic speed control method of the treadmill, characterized in that configured to include. An automatic speed control method of a treadmill having a deck, a track belt rotating in an endless track along a plate surface direction of the upper and lower surfaces of the deck, and a drive unit for driving the track belt, Measure the bridge voltage difference (ΔV) of the Wheatstone bridge formed of strain gauges installed on the bottom of the deck in the front and rear portions of the track belt so as to be deformed by the load transmitted through the deck supporting the user on the track belt. Making a step; The position of the user on the track belt is determined from the bridge voltage difference, and the speed of driving the driving unit is accelerated when the position of the user is located forward, and the driving speed of the driving unit is reduced when the user position is located behind Adjusting step; Automatic speed control method of the treadmill, characterized in that configured to include. The method of claim 13, And setting the acceleration / deceleration when the user position on the track belt is changed to an initial setting value ΔVset converted into the bridge voltage difference ΔV. And the speed adjusting step accelerates and decelerates the track belt only when the bridge voltage difference ΔV exceeds the initial set value ΔVset. The method according to claim 12 or 13, A preliminary measuring step of measuring the bridge voltage difference [Delta] V without automatically accelerating and decelerating the movement speed of the track belt for a predetermined time after the user starts exercising; Storing the difference between the bridge voltage difference and the load value in the preliminary measurement step as a reference bridge voltage difference (ΔVref); The speed adjusting step may further include determining the position on the user's track belt from the difference (ΔV-ΔVref) between the bridge voltage difference (ΔV) and the reference bridge voltage difference (ΔVref) to add or subtract the track belt. Automatic speed control method of the treadmill, characterized in that belonging. The method of claim 14, A preliminary measuring step of measuring the bridge voltage difference [Delta] V without automatically accelerating and decelerating the movement speed of the track belt for a predetermined time after the user starts exercising; Storing the difference between the bridge voltage difference and the load value in the preliminary measurement step as a reference bridge voltage difference (ΔVref); The speed adjusting step may include the case where the difference (ΔV−ΔVref) between the bridge voltage difference (ΔV) and the reference bridge voltage difference (ΔVref) exceeds the initial set value (ΔVset). Automatic speed control method of the treadmill, characterized in that for accelerating and decelerating the track belt. The method according to claim 12 or 13, When the position of the user does not accelerate or decelerate the moving speed of the track belt within a predetermined range around the middle portion of the track belt, and the position of the user exceeds the predetermined range around the middle portion. Automatic speed control method of the treadmill, characterized in that for accelerating or decelerating the movement speed of the track belt.

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