| 摘要 |
PROBLEM TO BE SOLVED: To prevent a carriage from being pushed up by providing a link supporting member for supporting a tube by forming a radius of curvature and supporting the link supporting member by means of a flexible elastic member and a nonflexible multijoint link supporting member. SOLUTION: When a carriage 6 is located on the right side viewed from the front side of a body 23, a caterpillar fixing member 18 is pushed upward in the direction of arrow P at L-part by a reaction to bending of a tube 4. Since a flexible member supporting member 5 is also pushed upward in the direction of arrow P at M-part by a reaction to bending of a flexible member 3, a caterpillar 2 is moved in the direction of arrow P at L and M parts. Since the caterpillar 2 is supported by a caterpillar supporting plate 31, it is not moved in the direction of Q by the bending reaction of the tube 4 and the flexible member 3. |
