Flexible mechanism and gantry device having the same

A gantry device comprising:

• a seat having a seat body, two upright walls, two guide channels and two drive members, the two upright walls being respectively fixedly disposed on two ends of the upper face of the seat body, the two guide channels being respectively disposed on the upper face of the seat body in parallel to each other, the two drive members being respectively disposed on top ends of the upright walls;
• a beam member having two slide members and a beam body, the slide members being respectively slidably disposed in the guide channels and connected with the drive members to reciprocally move along a first axis, the beam body being positioned above and the seat body between the two slide members;
• and
• a first flexible mechanism including a first connection member, a second connection member, a first flexible member and a second flexible member, the first connection member and the second connection member being respectively disposed on the beam member and relatively movable, the first flexible member being positioned in the direction of the first axis and bridged between the first connection member and the second connection member, the second flexible member being positioned in a direction different from the direction of the first axis and bridged between the first connection member and the second connection member, whereby when the first connection member and the second connection member are driven by the beam member to be relatively moved, the first flexible member is deformed, the gantry device being characterized in that the rigidity of the first flexible member is larger than the rigidity of the second flexible member for enhancing the anti-deformation ability of the first flexible member in the direction of the first axis.