| 摘要 |
PROBLEM TO BE SOLVED: To support a blade firmly against a holder and to facilitate operations for attaching and removing the blade to and from the holder during replacement of the blade. SOLUTION: A blade 2 is placed on a blade overlapping surface 7a and supported against a holder 1 while a fitting hole 18 and a fitting projection 8 are removably fitted together in such a way as to be movable relative to each other in a direction B generally perpendicular to the pressure contact surface 2a of the blade 2. A blade clamping slider 3 supported against the holder 1 moves in the extending direction of the blade 2 and can take a blade clamp releasing position and a blade clamping position Q. The holder 1 and the blade clamping slider 3 can make sliding contact with each other on their sliding surfaces 13a, 14a, 23a, 26a. In the blade clamp releasing position, the blade clamping slider 3 is separated from the blade 2 on the blade overlapping surface 7a. In the blade clamping position Q, the sliding surfaces 13a, 14a, 23a, 26a are clamped into contact and the pressure contact surface 2a of the blade 2 is clamped between the pressure contact 30 of the blade clamping slider 3 and the blade overlapping surface 7a to prevent separation of the blade 2 in the direction B of the relative movement. |
