Creasing devices
AssigneeTech-ni-Fold Ltd.
InventorGraham Michael Harris
Life of this patent
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Abstract
A creasing device is provided that includes a counter-rotating male drum and female drum. The male drum carries a conventional creasing ring with a central rib flanked by shoulders. The female drum comprises a central channel aligned with the creasing rib on the male drum; and a pair of projecting lateral ribs on each side of the central channel that are aligned with the shoulders on the male drum. The lateral ribs press a sheet of the card or paper stock against the shoulders of the creasing ring to better define the edges of the crease and to reduce the tendency of a printed coating on the stock to crack during subsequent folding. The pair of lateral ribs may be provided by a pair of inserts. Alternatively, both ribs and the central channel may be provided by a single insert.
Claims15
A creasing device comprising:
- a female drum that comprises:
- an outer surface;
- a central channel that extends around the circumference of the drum;
- and
- a pair of lateral ribs that extend around the circumference of the drum adjacent to and on each side of the central channel, the lateral ribs projecting radially outwards relative to a region of the outer surface adjacent to the lateral ribs;
- and
- a male drum that comprises:
- a resilient creasing ring, wherein a profile of the creasing ring comprises a single central rib;
- and
- a pair of resilient shoulders flanking the single central rib;
- wherein the male and female drums are arranged with their axes parallel, wherein the single central rib of the creasing ring extends into the central channel of the female drum to crease a sheet of stock therebetween;
- and wherein the lateral ribs of the female drum engage with the resilient shoulders of the male drum to compress the sheet of stock therebetween, wherein the resilient shoulders of the male drum are integral with the resilient creasing ring.
Dependencies are inferred from the claim text.