Method and apparatus for cutting corrugated strip
OwnerBernard J. Wallisinventor
Life of this patent
Estimating the term…
Abstract
A machine on which metal ribbon stock is corrugated has a toothed feed roll which engages the corrugated strip between successive corrugations to advance the strip lengthwise. Downstream from the feed roll is arranged one or more rotary-driven, toothed, unpacking rolls that are rotatably adjustable relative to the feed roll to stretch the corrugated strip advanced by the feed roll a predetermined amount so that, when the strip is cut to length at a further downstream station, it will have the desired number of corrugations per unit length.
Claims16
In a machine wherein metal ribbon stock is corrugated transversely by feeding it lengthwise between a pair of toothed corrugating rolls and the corrugated strip is advanced to a rotary driven tooth feed roll in a lengthwise compacted condition wherein the number of convolutions per unit length is greater than desired in the finished strip, said feed roll being adapted to engage the strip between the crests of the successive corrugation and advance it lengthwise in a downstream direction, the improvement which comprises a rotary driven unpacking roll located downstream from the feed roll in the path of travel of the corrugated strip, said unpacking roll having regularly spaced teeth around its outer periphery adapted to engage between the crests of the convolutions of the corrugated strip to advance the strip further in a downstream direction, means permitting rotary adjustment of the unpacking roll relative to the feed roll while the latter is stationary to stretch the section of the corrugated strip engaged by and extending between the two rolls so that the number of convolutions per unit length in said stretched section is less than the number of convolutions per unit length in the portion of the corrugated strip upstream from said feed roll and means for locking the unpacking roll in said rotatably-adjusted position relative to the feed roll.
The method of making a transversely corrugated heat exchanger strip which comprises feeding a metal ribbon between a pair of corrugated rolls to impart a zig-zag configuration to the ribbon;
- compressing the corrugated strip lengthwise to further bend the crests of the corrugations and to compress the strip to a condition wherein the number of convolutions per unit length is greater than desired in the finished strip;
- advancing the compacted corrugated strip to a rotary-driven feed roll having a plurality of regularly spaced teeth around its periphery adapted to engage between the successive crests to feed the compacted strip lengthwise;
- advancing the strip to a rotary unpacking roll located downstream from the feed roll in the path of travel of the strip, said unpacking roll also having a plurality of regularly spaced teeth around its periphery adapted to engage between the crests of the corrugated strip and advance it in a further downstream direction;
- maintaining the feed roll stationary and rotating the unpacking roll while engaged with the corrugations of said strip to stretch the section of the strip between the feed roll and the unpacking roll so that the number of convolutions per unit length therebetween is less than in the compacted strip and thereafter simultaneously rotating the feed roll and the unpacking roll such as to maintain the section of the advancing strip therebetween in said stretched condition.
Dependencies are inferred from the claim text.