US 6,615,699 B2 · Method and device for cutting continuously conveyed, flat objects

Abstract

The described method serves for trimming or cutting during conveyance in a conveying direction (F) substantially in parallel to their main surfaces, flat objects along predetermined cutting lines parallel to the conveying direction (F). The objects are conveyed between a first and a second cutting edge (SK1 and SK2) and are cut by a relative movement of the two cutting edges. The first cutting edge (SK1) is positioned, e.g. stationary, in the plane of a support surface supporting the objects and for each cutting process, the second cutting edge (SK2) is moved past the first cutting edge in such a manner that at least the cutting point on the second cutting edge has a speed component in conveying direction (F) which has the same size as the conveying direction and a speed component perpendicular to the support surface. This is advantageously realized by a swiveling or rotating movement of the second cutting edge (SK2) around a rotation axis (M) arranged above the support surface, whereby for fulfilling the above condition, the distance (y) of the rotation axis from the support surface and the rotation speed (ω) are correspondingly matched. Advantageously, a plurality of second cutting edges (SK2) are arranged in a star-shaped manner in a plane perpendicular to the rotation axis (M) and the arrangement of second cutting edges (SK2) is rotated around the rotation axis at a constant speed (ω).

Claims14

Dependent claims

A method for cutting laminar objects having major faces during a continuous motion in a conveying direction with a conveying speed VG, the conveying direction defining a downstream edge for each object and an upstream edge for each object, in which method the objects are cut along a cut line between first and second substantially linear cutting edges, the cut line substantially parallel to the conveying direction, the method defining a cutting process for each object, the method comprising:

positioning the first cutting edge close to one of the major faces of the objects;
rotating the second cutting edge about a pivot perpendicular to the conveying direction at a velocity ω and spaced away by a distance y from the major faces of the objects, the pivot defining a rotation axis, the rotation of the second cutting edge relative to the first cutting edge defining a crossing point where a cutting occurs, said crossing point further defining a region of the second cutting edge about the crossing point;
the rotation of the second cutting edge carried out so that VG=yω2π, whereby during the cutting, the region of the second cutting edge about the crossing point has a velocity, the velocity having a component in the conveying direction substantially the same as the conveying speed, and
the cutting carried out so that each cut of an object is performed by only one second cutting edge;
the cutting carried out so that the conveying direction is parallel to the faces of the objects to be cut, and that the cutting edges are positioned or moving in a plane parallel to the conveying direction and substantially perpendicular to the faces of the objects.

2 more elements

An apparatus for cutting laminar objects during continuous motion in a conveying direction, the objects having major faces, the apparatus comprising:

a conveyor conveying the laminar objects in a continuous motion in the conveying direction with a conveying speed VG;
first and second substantially linear cutting edges, the objects being cut along a cut line between the first and second cutting edges;
the motion of the laminar objects substantially parallel to the cut line;
means positioning the first cutting edge close to one of the major faces of the objects;
means for rotating the second cutting edge about a pivot perpendicular to the conveying direction at a velocity ω and spaced away by a distance y from the major faces of the objects, the pivot defining a rotation axis, the rotation of the second cutting edge relative to the first cutting edge defining a crossing point where a cutting occurs, said crossing point further defining a region of the second cutting edge about the crossing point;
the rotating means further characterized in that the rotation of the second cutting edge is carried out so that VG=yω2π, whereby during the cutting, the region of the second cutting edge about the crossing point has a velocity, the velocity having a component in the conveying direction substantially the same as the conveying speed;
and
the length and positioning of the second cutting edge characterized in that each cut of an object is performed by only one second cutting edge;
the cutting carried out so that the conveying direction is parallel to the faces of the objects to be cut, and that the cutting edges are positioned or moving in a plane parallel to the conveying direction and substantially perpendicular to the faces of the objects.

6 more elements

Dependencies are inferred from the claim text.

Method and device for cutting continuously conveyed, flat objects

Life of this patent

Method and device for cutting continuously conveyed, flat objects

Life of this patent

Abstract

Claims14