抄録
Recently, "Washer Dryer" type of washing machines with horizontal or slant drum becoming popular in Japan. We have measured and analyzed the posture while using the machines with the 3 dimensional motion capture measurement device. Subjective Kansei and usability questionnaire were also used. After the measurement, measured working postures are analyzed with the human kinematics model (3D SSPP) that can estimate theoretical value of the muscle tension and loads on the lumber vertebrae, knees and ankles. Three types of washers (European type ; box shape and horizontal drum, Conventional Japanese type ; a vertical drum, New type ; slant drum with higher profile) were used for the experiment. Subjects were 12 females and those age were between 22 to 43. Theoretical muscular forces (%MVC ; a percentage of the maximum muscular force of 50 percentile female) on elbow, hip, knee and ankle were estimated. Sum of the %MVC of the new type was 116, European type was 133 (knee tension is high) and conventional Japanese type was 284 (ankle tension is 110, which exceeds the limit). The new type requires only 40% of the muscular force than conventional Japanese type. From the subjective evaluation, the new type was better than the European type washer and conventional type on two of the question, subjective fatigue and general evaluation, with statistical significance with one-way ANOVA.
