JPH07308406A - Treadle type exercise machine - Google Patents

Abstract

PURPOSE:To enable a user to attain exercise for the target time under adequate exercise load. CONSTITUTION:A helical gear 12 of a crank pedal shaft 17 and a helical gear 11 of a handlebar oscillation link mechanism are meshed with a worm gear 14 of an induction motor 13. A control section is provided with a function to set a reference number of revolutions and a function to drive/brake the induction motor and reads the number of revolutions of the induction motor 13 by a revolution sensor 29. The user makes exercise by treading pedals 15, 16 and running the induction motor 13. The pedals are braked by the DC current and the exercise load is applied on the user when the number of revolutions of the induction motor 13 is above the reference number of revolutions. The induction motor 13 is driven and the exercise is continued when the number of revolutions is below the reference number of revolutions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foot-operated exercise machine, and more particularly, to a foot-operated exercise machine capable of electrically adjusting an exercise load.

[0002]

2. Description of the Related Art As conventional foot-operated exercise machines, a step-type exercise machine that alternately depresses a lever-type pedal and a bicycle-type exercise machine that rotates a crank pedal are known. A load device for a step type exercise machine is generally one in which a brake such as an oil damper is interposed between a lever type pedal and a frame. As a load device for a bicycle-type exercise machine, a flywheel is connected to a crank pedal shaft and a mechanical brake is interposed on the flywheel, or a pair of electromagnets are arranged so as to sandwich the flywheel. Some have eddy current brakes.

[0003]

It is known that exercise is effective in improving cardiopulmonary function and the like by continuously performing the exercise for a certain period of time. However, in a conventional foot-operated exercise machine that applies a constant exercise load, the exercise amount may be interrupted before the target time is reached due to fatigue or diminished motivation, and the target exercise amount may not be achieved.

Therefore, there is a technical problem to be solved in order to ensure that a desired exercise effect can be obtained by continuing exercise for a target time without overloading an exerciser. The present invention aims to solve the above problems.

[0005]

DISCLOSURE OF THE INVENTION The present invention is proposed in order to achieve the above object, and is a foot-operated motion in which a frame is provided with a pedal such as a rotatable crank pedal or a swingable lever-type pedal. In the machine, the pedal and the induction motor are connected via a gear device, and a detector for detecting the rotation speed of the induction motor is provided, and a reference rotation speed setting means and a drive speed control unit for the induction motor are provided. Provided is a foot-operated exercise machine having a comparison means for comparing a reference rotation speed and a measured rotation speed, and a control means for switching between driving and braking of the induction motor according to the comparison result.

[0006]

The pedal of the foot-operated exercise machine of the present invention is connected to and interlocks with the induction motor, and the reference speed can be set in the control section of the drive circuit. The rotation speed of the induction motor is detected by the rotation detector, and the control unit compares the detected rotation speed with the reference rotation speed. When the rotation speed is lower than the reference rotation speed, the control unit drives the induction motor, and conversely, when the rotation speed is higher than the reference rotation speed, the induction motor is braked.

When the exerciser drives the pedal at a speed higher than the reference rotation speed, the pedal is braked and a load is applied to the exerciser.
Further, when the number of revolutions drops below the reference number of revolutions due to fatigue or the like, the induction motor is driven to rotate the pedals, and the exercise is continued without overloading the exerciser.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. 1 and 2 show a bicycle-type exercise machine 1, in which a base frame 2 of the bicycle-type exercise machine 1 has horizontal frame members 4 and 5 in the left-right direction fixed in front of and behind a central frame member 3 arranged in the front-rear direction. It is set up. A handle post 6 is erected on the front portion of the central frame member 3, and a saddle support post 7 is erected on the rear portion thereof. A saddle post 8 is fitted to the saddle support post 7 so that its vertical position can be adjusted, and the saddle 9 fixed to the upper portion of the saddle post 8 can be fixed at an arbitrary height.

A gear box 10 is provided above and below the handle post 6 and the saddle support post 7, and a pair of helical gears 11 and 12 having the same number of teeth are provided in the gear box 10 at the front and rear. In addition, the worm gear 14 fitted to the shaft of the induction motor 13 arranged upward on the central frame member 3 includes the pair of helical gears 1.
The pair of helical gears 11 and 12 are interposed between the first and the second gears 12, and are formed so as to interlock with each other via the worm gear 14.

Rear (right in FIG. 1) helical gear 1
2 is a crank pedal shaft 17 to which pedals 15 and 16 are attached
Crank levers 19 and 20 having different phases from each other are fitted to the left and right ends of the crank lever shaft 18 fitted to the front helical gear 11. Crank handles 22, 23 are loosely fitted to the left and right of a shaft 21 in the left-right direction provided at the upper end portion of the handle post 6, levers 24, 25 integrated with the crank handles 22, 23, and the front helical gear 11 described above. Crank lever 19,
20 is connected via links 26 and 27, respectively. Therefore, the left and right crank handles 22 and 23 are alternately oscillated back and forth in conjunction with the rotation of the front helical gear 11.

The helical gears 11 and 12 are formed to have a large twist angle, and when the pedals 15 and 16 are rotated to rotate the helical gear 12, the worm gear 14 and the front helical gear 11 are interlocked with each other, and the induction motor 13 and the crank. The handles 22 and 23 are driven. Further, an electric circuit device 28 such as a power supply unit, a control unit, and a drive circuit is installed behind the saddle support post 7, and a rotation sensor 29 arranged near the shaft of the induction motor 13 is connected to the control unit. .

The gear box 10, the link mechanism, the electric circuit device 28 and the like described above are covered with an outer casing 30, the left and right crank handles 22, 23 and the saddle 9 are exposed from the outer casing 30, and the handle post 6 is provided. An operation panel 31 and a liquid crystal display device 32 are provided on the upper surface of the outer casing 30 corresponding to the upper part of the, and are respectively connected to the control unit. The control unit controls the drive circuit of the induction motor 13 and controls the output current based on the input data from the operation panel 31 and the detection value of the rotation sensor 29.

FIG. 3 shows the drive circuit 33, and the induction motor 1
3 is an AC power source 3 via a bidirectional 3-terminal thyristor 34.
5, the gate of the bidirectional three-terminal thyristor 34 is controlled by the switching transistor Q ₁ to control the phase of the alternating current and change the drive current of the induction motor 13. Further, rectifying the DC power obtained by rectifying by the diode D ₁ is connected to the induction motor 13 through the transistor Q _2, calculates the transistor Q ₂ amplifiers 36
Controlled by the above, an arbitrary DC current is supplied to the induction motor 13 so that the induction motor 13 can be braked.

The control unit 37 stores DC current / rotation speed data of three stages of braking torque of 1 kgm, 2 kgm, 3 kgm as shown in FIG. 4, and by selecting an arbitrary braking torque value. The current control is executed according to the braking torque value, and a constant rotational load can be obtained regardless of the rotation speed of the crank pedal shaft 17. Further, the reference rotation speed R, which is a switching point between driving and braking, can be arbitrarily set, and as shown in FIG. 5, the induction motor 13 is driven with a predetermined torque below the reference rotation speed R, and set above the reference rotation speed. It is configured to brake with torque.

Next, the control procedure of the controller 37 will be described with reference to FIG. First, an arbitrary braking torque value and reference rotation speed are set by the keys on the operation panel 31 (step 10).
1). Then, the rotation speed of the rotor of the induction motor 13 is read via the rotation sensor 29 (step 102) and compared with the reference rotation speed R (step 103). Since the rotation speed A is equal to or lower than the reference rotation speed R at the time of starting the training, the drive current for the set drive torque is calculated from the rotation speed A (step 104), and the induction motor 13 is driven with a predetermined torque (step). 105).

Then, the exerciser voluntarily pedals 15, 1.
When row number 6 is started and the number of revolutions A and the reference number of revolutions R match, the drive current to the induction motor 13 is turned off (step 103 → 106). When the pedal rotation speed of the exerciser increases and the rotation speed A exceeds the reference rotation speed R, the braking current amount is calculated from the DC current / rotation speed data of the braking torque shown in FIG. 4 (step 107). A DC current corresponding to the calculated value is output to brake the induction motor 13, and step 1
The braking load set in 01 is applied to the exerciser.

When the pedal rotation speed A of the exerciser becomes lower than the reference rotation speed R due to fatigue, diminished motivation for exercise, or the like, the step 1 goes through the OFF state of step 106 to step 1
In the order 03 → 104 → 105, the induction motor 13 is driven to continue the rotary motion. Further, when the rotation speed A rises above the reference rotation speed R due to recovery from fatigue, etc., the control shifts to the above-mentioned braking control, and driving and braking are automatically switched and set in advance by a timer or the like (not shown). Exercise continues until the specified target time is reached.

When switching between driving and braking, delay control is performed so that the driving current or braking current gradually increases from a low current value to reach the target value, and shock during switching is prevented, resulting in a comfortable feeling of use. Is obtained. Further, the reference rotational speed R may be set to R ± α to provide a dead zone between driving and braking, or a hysteresis characteristic may be given to the switching operation. Further, the drive circuit is not limited to the above-mentioned circuit, and the current may be turned on / off by a relay, or may be by the inverter control shown in FIG. 7. In the drive circuit shown in the figure, the AC power supply 38 is full-wave rectified by a diode bridge 39, and the + power supply and the − power supply are connected by two pairs of switching transistors Q ₃ , Q ₄ and Q ₅ , Q ₆ . The switching transistors Q ₃ and Q connected in series, respectively.
_An induction motor 13 is connected between ₄ and Q ₅ and Q ₆ .

Switching transistors Q ₃ , Q ₅ and Q
₄ and Q ₆ are symmetrically turned on / off by the control unit 40 to drive the induction motor 13, PWM control the on / off duty ratio, and output a pseudo sine wave. Then, the rotation speed is controlled by changing the frequency of the pseudo sine wave. When the induction motor 13 is braked, the switching transistors Q ₄ and Q ₅ are turned off and Q ₃ and Q ₆ are turned on, so that a direct current is supplied to the induction motor 13 and a rotational load is applied to the crank pedal shaft 17. Given. Then, the DC current value can be varied by changing the duty ratio of the switching transistor Q ₃ , and the driving force and the braking force can be controlled as in the driving circuit shown in FIG.

Although not shown in the drawings, also in a step type exerciser in which a pair of lever type pedals are stepped on alternately, a longitudinal guide groove is provided in the front portion of the lever type pedal, and this guide groove is used as a crank for the helical gear 12. The induction motor 13 can be driven and braked by adopting such a structure as engaging the pedal shaft 17 and converting the up-and-down movement of the pedal into the rotational movement of the helical gear 12. Further, the present invention can be variously modified within the technical scope of the present invention, and it goes without saying that the present invention extends to those modifications.

[0021]

As described in detail in the above-mentioned one embodiment, the present invention connects the pedal of the foot-operated exercise machine to the induction motor, and when the rotation speed of the induction motor is equal to or higher than the arbitrarily set reference rotation speed. The induction motor is braked, and conversely, when the rotation speed is equal to or lower than the reference rotation speed, the driving state is switched to. Therefore, even if the exerciser decelerates or stops the rotational movement of the pedal due to fatigue during exercise in the braking state, the rotation of the pedal continues, so that it is possible to prevent the exercise from stopping before the target time, and to prevent excessive exercise. It is possible to reliably achieve the target amount of exercise without giving a load.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view of a bicycle-type exercise machine showing an embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the bicycle-type exercise machine shown in FIG.

FIG. 3 is a drive circuit diagram of the bicycle-type exercise machine.

FIG. 4 is a rotation speed / DC current graph showing a braking torque characteristic of a drive circuit.

FIG. 5 is a graph showing a relationship of switching between rotation speed and driving / braking.

FIG. 6 is a flowchart of drive / braking switching control.

FIG. 7 is a circuit diagram of an inverter control type drive circuit showing another embodiment.

[Explanation of symbols]

 1 Bicycle type exercise machine 2 Base frame 10 Gear box 11,12 Helical gear 13 Induction motor 14 Worm gear 15,16 Pedal 17 Crank pedal shaft 18 Crank lever shaft 19,20 Crank lever 22,23 Crank handle 24,25 Lever 26,27 Link 28 Electric Circuit Device 29 Rotation Sensor 31 Control Panel 33 Drive Circuit 37 Control Section

Claims (1)

[Claims] 1. A foot-operated exercise machine having a frame provided with a pedal such as a rotatable crank pedal or a swingable lever-type pedal, wherein the pedal and the induction motor are connected via a gear device, A detector for detecting the rotation speed of the induction motor is provided, and a reference rotation speed setting means and a comparison means for comparing the reference rotation speed and the measurement rotation speed are provided in the drive control section of the induction motor, and the reference rotation speed is measured according to the comparison result. A foot-operated exercise machine comprising control means for switching between driving and braking of an induction motor.