System for fabricating contour muntin bars from sheet material

Details System for fabricating contour muntin bars from sheet material System for fabricating contour muntin bars from sheet material

B - Operations, Transporting

21

C

B21C 37/06 (2006.01) B21C 47/16 (2006.01) B21D 5/14 (2006.01) B21D 17/00 (2006.01) B21D 53/74 (2006.01) B23P 13/00 (2006.01) B23P 15/00 (2006.01) E06B 3/663 (2006.01) E06B 3/673 (2006.01)

Patent

CA 2310993

Method and apparatus for making a contoured muntin bar. A supply of sheet material having a finished surface on at least one side in the form of a coiled ribbon is unwound and fed along a strip path of travel to a punch station. At the punch station a ribbon punching mechanism punches the ribbon at a precisely predetermined locations along the ribbon to form one of a plurality notch patterns that define a portion of a contoured muntin bar. Downstream along the travel path from the punch station the ribbon is fed through a forming station having a succession of forming rolls that define a succession of forming roll nips to bend the ribbon and form a generally closed cross-sectional tube. The rolls form a number of bending stages to produce a muntin bar tube having a contoured shape with raised sides to provide an attractive appearance to a muntin grid.

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