Cutting – With means to convey work relative to tool station – Cut made parallel to direction of and during work movement
Patent
1985-02-19
1987-09-15
Briggs, William R.
Cutting
With means to convey work relative to tool station
Cut made parallel to direction of and during work movement
83433, 83856, 83926H, B26D 706
Patent
active
046931570
ABSTRACT:
For cutting polymer films, e.g. a continuously moving web of polymer film, there is accomplished relative movement between the film and a cutting edge which is a substantially continuous and generally razor-sharp edge located at the periphery of an indexing steel sheet disc having a generally circular shape and a thickness in the same order of magnitude as the thickness of the polymer film; after maintaining the disc in a first angular position where an incremental portion e.g. 1 to 10 degree of a 360.degree. periphery, of the cutting edge is in film-cutting position for a period of cutting time, the disc is indexed and a subsequent incremental portion of the edge is moved into film-cutting position and held there for another period of cutting time. This is repeated until a major part and preferably all of the continuous edge has been indexed. Then, the disc is exchanged. When using an automated indexing actuator, e.g. a step-motor, and monitoring cutting time, the frequency of step-switching can be adapted to the periods of time during which the incremental edge portions of the indexing blade are in cutting position. Near completion of an indexing cycle, a signal is generated and a fresh blade is put into operation. As a consequence, a perfectly sharp edge portion of the indexing blade will be in film-cutting position at any time, thus providing for reliable cutting of the film, e.g. emerging as a tubular film from extrusion, even when highly abrasive films are processed.
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Briggs William R.
Kleeman Werner W.
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