Burster
AssigneeSwingline Inc.
InventorMarlin A. Schueler
Life of this patent
Estimating the term…
Abstract
An improvement in a machine for longitudinally separating portions of a continuous web of paper has a triangularly shaped breaking element engaging the under side of the web with spaced apart breaking triangles for ripping the paper along perforation lines and accommodating intermittant longitudinal web displacement.
Claims10
In a burster for separating successive sheets of paper from a continuous web along lateral perforation lines and having a pair of driven feed rollers spaced from a pair of snap rollers driven at a greater speed than said feed rollers, the improvement comprising a breaking element disposed between said pairs of rollers and having a triangular upper surface with the apex thereof horizontally aligned with the contact of said snap rollers and said triangular upper surface being inclined downwardly from the apex to the base adjacent the contact of said feed rollers and a secondary breaking unit having sides slanted inwardly and upwardly to a forward apex displaced from the apex of said triangular upper surface toward said snap rollers with said apices being horizontally aligned and also aligned longitudinally of the traverse of paper through the burster whereby paper moved by said feed rollers over said breaking element folds thereover for tearing the paper along a perforation line each time the snap rollers grip and pull the paper.
In a burster for separating successive sheets of paper from a continuous web along lateral perforation lines and having a pair of driven feed rollers spaced from a pair of snap rollers driven at a greater speed than said feed rollers, the improvement comprising a breaking element disposed between said pairs of rollers and having a triangular upper surface with the apex thereof horizontally aligned with the contact of said snap rollers and said triangular upper surface being inclined downwardly from the apex to the base adjacent the contact of said feed rollers and a secondary breaking unit in the form of a pyramid having the apex thereof horizontally aligned with the apex of said triangular surface on the side of said snap rollers therefrom and said apices being aligned with the mid-points of said rollers and separated a short distance from each other whereby paper moved by said feed rollers over said breaker element folds thereover for tearing the paper along a perforation line each time the snap rollers grip and pull the paper.
Dependencies are inferred from the claim text.