Bicycle type training machine

摘要

A bicycle type training machine includes a crank arm secured to a rotation shaft, pedals being attached to the both free ends of the crank arm. A rotation shaft of a generator is coupled to the rotation shaft of the crank arm. Data of load amount to be loaded to the rotation shaft of the crank arm is outputted by a microcomputer. The load value data is then compared with a count value of a counter to which a pulse train is applied from a reference oscillator, and a pulse signal having the high level and the low level in accordance with a result of the comparison is outputted from a comparator. A duty ratio of the outputted pulse signal is decided by the periods of the high level and the low level and changed in accordance with the load value data. A switching transistor electrically connected in parallel to an armature of the generator is turned-on or -off in response to the high level or the low level of the pulse signal. Braking force of the generator is changed in accordance with the duty ratio of the switching transistor. Therefore, the load that is decided by the load value data from the microcomputer is loaded to the rotation shaft of the crank arm and thus the legs of the user.