| 摘要 |
Improved apparatus for perforating strip or sheet material is provided at high perforating speeds and with an economy of material; and which may be used for the inexpensive production of perforated soft ductile metal strips for grills, acoustic devices, and the like, for example, to cover the openings of cabinets of radio receivers and other apparatus, as well as for use in filter tubes, acoustic strip ceilings, or other structural applications. The apparatus comprises a driven roller and a freely rotatable roller positioned so that a strip of soft ductile metal, such as aluminum, may be drawn between the roller surfaces as the driven roller is rotated. The driven roller is provided with rows of teeth, and the free roller has corresponding peripheral grooves, the combination being such that when the strip is fed between the rollers, the teeth of the driven roller penetrate the strip and form horizontal and longitudinal rows of slots, shallow elongated V-shaped depressions.
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