| 摘要 |
A rotary head mounts a straight cutter blade the working edge of which intercepts the plane of an associated flat anvil to form an acute included angle. The anvil is provided with a longitudinally concave working edge which is contiguous to the working edge of the blade uniformly throughout their cooperative lengths, and preferably with a longitudinally concave and transversely sinusoidal working face, the opposite longitudinal edges of which are reverse images of each other, whereby the anvil is reversible. This anvil construction is provided by traversing the working face with a rotary cutting tool which defines a cutting arc having the same radius as the rotational radius of the blade, with the intercepting planes of the anvil and direction of relative movement of the anvil and cutting tool being arranged to form the aforementioned acute included angle.
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