| 摘要 |
PROBLEM TO BE SOLVED: To miniaturize a retractor, enable high speed drawing and high speed winding and lower pressed feeling of a person who wears the belt by providing an intermediate gear which is engaged with a winding shaft main gear, a planetary gear moving on a raceway concentrically with the engaged intermediate gear rotary shaft and a rotary plate with which teeth of a spiral passage are engaged. SOLUTION: When a belt is drawn, a main gear 20 performs A direction revolutions, intermediate gears 30 A, B perform B direction speed reduction revolutions and planetary gears 50 A, B perform C direction revolutions. The planetary gears 50 A, B move by engaging teeth 54 A, B with teeth 62 A, B within spiral grooves 61 A, B of a rotary plate 60 and perform D direction revolutions for the rotary plate 60. At this time, the rotary plate 60 winds and fastens a helical spring on a projecting part. Because the speed reduction ratio of the rotary plate 60 gradually becomes larger as the main gear 20 revolves in a belt drawing direction, belt tensile force can be maintained almost constant, regardless of the number of revolution of a winding shaft. Thus, the belt is surely pulled in and is lightly drawn, and movement of a person who wears the belt is not constrained when the person wears the belt. |
