(57) A resistance mechanism for an exercising device includes a frame, a bi-directional
electric motor installed on the frame and provided with an output axle, a pulley fixedly
mounted on the output axle and formed with two parallel circular grooves, an idle
wheel rotatably arranged on the frame, a first belt having one end connected with
one of the grooves of the pulley and wound thereon in a direction, a second belt having
one end connected with another one of the grooves of the pulley and wound thereon
in an opposite direction and engaged with the idle wheel, and an oscillating arm having
one end pivotally connected with the axle of the exericsing device and another end
fixedly connected with another end of the first belt and another end of the second
belt, whereby a resistance force will be applied to the axle when theelectric bi-directional
motor is turned on.
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