Cutting – Cutting motion of tool has component in direction of moving... – Orbital motion of cutting blade
Patent
1976-07-14
1978-02-21
Schran, Donald R.
Cutting
Cutting motion of tool has component in direction of moving...
Orbital motion of cutting blade
83678, 83659, B23D 2512, B26D 156
Patent
active
040745996
ABSTRACT:
A machine for performing certain operations in the production of endless business forms has a plurality of cross-perforating knife blades for perforating the endless paper webs at predetermined increments, whereby the perforating knife blades are mounted in slots in the surface of rotating cylindrical bodies and are cutting through the paper webs with their spaced apart perforating knife edges against a rotating "anvil" cylinder which has a hardened, smooth surface. The cyclic impacts of the perforating blades on the anvil cylinder can become resonant with critical frequencies of the anvil cylinder at certain speeds of the latter and with a certain number of inserted perforating blades causing the destruction of the cutting edges of the former, and therefore the structure of the anvil must be such that no resonances will occur between the cyclic impacts of multiple perforating blades at high speed production operations of the machine. Similarly the structure of the knife blade cylinder may be such that resonance will not occur and the combined anvil cylinder and knife blade cylinder may be so structured to shift or reduce resonant frequency problems.
REFERENCES:
patent: 927846 (1909-07-01), Flett
patent: 1313325 (1919-08-01), Nordyke et al.
patent: 2882763 (1959-04-01), Fry
patent: 3866497 (1975-02-01), Wolfberg et al.
Schran Donald R.
Wood Industries, Inc.
Woronoff David S.
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