主权项 |
1. A pneumatic device adapted to drive movement of a saw blade, comprising:
a cylinder including a cylinder wall that surrounds an axis and that defines an air chamber therein; a buffer member positioned within said air chamber, and having a tubular wall that surrounds the axis to define a communicating hole therein, said tubular wall having a length along the axis that is greater than the wall thickness thereof; and a piston unit including a sealing member, and a rod member that is movably extends through said communicating hole of said buffer member and that is adapted to be mounted with the saw blade, said rod member having a driven section that is received within said air chamber, said sealing member being mounted to said driven section of said rod member, being co-moveable with said driven section, and being in air-tight contact with an inner surrounding surface of said cylinder wall, said piston unit being able to be driven pneumatically to move between a restoring position where said driven section is spaced apart from said buffer member, and an impact position where at least one of said driven section and said sealing member is in contact with said buffer member. |