Reel for registry of a material web provided with crease lines
AssigneeAB Tetra Pak
InventorHakan Lesse
Life of this patent
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Abstract
In the processing of a material web provided with crease lines a reel is used frequently for registry. The reel comprises one or more axial rules, the distance between these being adapted to the distance between transverse crease lines of the material web. To ensure a correct engagement with the crease lines, the rules are relatively sharp which may cause damage to the material web. Supporting elements are provided at the end of the rules so that any material extending beyond the ends is not folded or broken. The reel moreover comprises adjustment facilities for adapting it to varying distances between the transverse crease lines of the material web.
Claims9
A rotating reel for supporting an advancing web of flexible material that has crease lines extending transversely to the direction of advance of said material, said reel comprising:
- a central axis;
- means for rotating said reel about a central axis;
- a plurality of rules mounted on said reel, said rules being spaced radially from said central axis and each rule having an edge with a central major portion extending substantially parallel to said axis and comparatively smaller end portions whose distance from said central axis is less than that of said central major portion;
- said rules having a support element mounted on said smaller end portions of the edge, said support elements having a support surface spaced from said central axis a distance less than said central major portion, whereby the central portion of said advancing web is tensioned over said central major portion as the reel rotates, while the lateral edges of said web are carried over said support surfaces.
Dependencies are inferred from the claim text.