| 摘要 |
A scissor shear apparatus is disclosed for shearing material. The apparatus includes a frame and a first shear blade having a first and a second end, the first shear blade being pivotally secured to the frame about a first pivotal axis which extends through the frame and through the first shear blade between the ends thereof. The first shear blade defines a first cutting edge which is disposed adjacent to the first end thereof. A second shear blade has a first and a second extremity, the second shear blade being pivotally secured to the frame about the first pivotal axis between the extremities thereof. The second shear blade defines a second cutting edge which is disposed adjacent to the first extremity thereof such that the cutting edges cooperate together for shearing the material when the second end of the first shear blade and the second extremity of the second shear blade move away from each other for pivoting the shear blades relative to each other. A first link has a first and a second end, the first end of the first link being pivotally secured to the second end of the first shear blade for rotation thereof about a second pivotal axis which is disposed parallel and spaced relative to the first pivotal axis. A second link has a first and a second extremity, the first extremity of the second link being pivotally secured to the second extremity of the second shear blade for rotation thereof about a third pivotal axis which is disposed parallel and spaced relative to the first and second pivotal axes. An axle is disposed adjacent to the second end of the first link and the second extremity of the second link such that the axle and second end and extremity respectively of the links pivot about a fourth axis which is disposed spaced and parallel relative to the first, second and third axes. A first arm has a first and a second end, the first arm being secured to the frame about a fifth pivotal axis which is disposed spaced and parallel relative to the first, second, third and fourth axes. The fifth axis is disposed between the ends of the first arm. The first end of the first arm defines a lost motion linkage which is connected to the axle such that when the first arm pivots about the fifth axis, the axle is moved by the lost motion linkage for moving the second end of the first shear blade and the second extremity of the second shear blade towards and away from each other for pivoting the shear blades relative to each other. A second arm has a first and a second extremity, the first extremity of the second arm being pivotally secured to the second end of the first arm for pivotally driving the first arm. A crank is rotatably secured to the flame about a first rotational axis. The crank includes a crank pin which has a second rotational axis which is disposed spaced and parallel relative to the first rotational axis such that, when the crank rotates about the first rotational axis, the second rotational axis of the crank pin orbits about the first rotational axis. The crank pin is pivotally secured to the second extremity of the second arm such that, when the crank is rotated about the first rotational axis, the second arm is reciprocated for pivoting the first arm about the fifth pivotal axis so that the cutting edges of the blades shear the material.
|
