Manufacturing container or tube from paper; or other manufacturi – With cutting – breaking – tearing – or abrading – And with bending
Patent
1987-03-17
1989-03-28
Smith, James G.
Manufacturing container or tube from paper; or other manufacturi
With cutting, breaking, tearing, or abrading
And with bending
493400, 493404, 269 21, B31B 125, B31B 102
Patent
active
048160156
DESCRIPTION:
BRIEF SUMMARY
PRIOR ART
The invention is based on a machine for producing pattern cardboard articles.
In a known machine, a scoring wheel which has a relatively large diameter is moved by the guiding device across a workpiece for impressing the scoring line; to make additional scoring lines, or scoring lines extending in a different direction, the workpiece is moved into a corresponding position, while the scoring wheel always follows the same reciprocating path, although in that case the scoring board serving as a backing can be relatively narrow. To enable transporting the workpiece, pneumatically actuated tongs, on the one hand, and an adjuster arm equipped with suction devices for grasping the workpiece, on the other, are provided. The disadvantage of this known machine is that exact positioning of the workpiece for the scoring operation is quite difficult, so a number of measuring transducers which monitor the position of the workpiece at any time must be provided, quite aside from the fact that the entire apparatus is extraordinarily expensive. A substantial disadvantage is that only rectilinear scoring lines can be made, rather than curved ones. Especially in modern cardboard articles, there is an increasing demand for packages with curved fold lines. A further substantial disadvantage of this known machine is that equipping it with numerical control is extremely complicated, if not impossible. Numerical control requires a coordinate system in which set points can be approached, but such a system is difficult to provide because additional coordination must be effected between the transportation of the workpiece and that of the tool; transporting of the workpiece must moreover be effected by two different transporting methods, which also requires one program associated with another one.
In producing ready-cut and scored pattern boxes, it is important that this machine-made and hence reproducible and identical pattern be as similar as possible to the mass-produced product that will later be produced on special stamping and scoring machines; that is, the prerequisites for good machine manufacture must already be apparent and should also already be present in the pattern workpiece. The properties of the packaging material, such as the depth and width of the scoring lines as well as the extent of compression of the material in the vicinity of the scoring line, must already be taken into account in the pattern piece, so that no later than when tests are made with this pattern using the planned subsequent mass production process, the results obtained will deviate little, if at all, from those appropriate for the mass production. Since the force required for folding a box, for example, that is, the prevailing restoring forces, the allowable folding speed, the allowable folding angle, and so forth, depend on the scoring depth and width, it is important that this data already be present in the pattern workpiece. The cardboard that is cut to a pattern and scored on a mass production basis undergoes complex strains in the course of its further processing, which may lead to serious, unforeseeable defects in the product, if there are deviations between the pattern workpiece and the mass-produced workpiece.
Unlike the production of pattern cardboard articles, in the mass production of such folding boxes the scoring is produced via a so-called scoring knife, which has a dull blade that is pressed into the cardboard - so that the cardboard is compressed, but not cut; this scoring knife is disposed in a tool holder and cooperates with scoring grooves in a bottom scoring die. The depth to which the scoring knife penetrates the material is defined exactly, and this corresponds to a defined material compression. Where scoring lines intersect, this can easily be accomplished by means of suitable crossings of the scoring knife or scoring grooves. Naturally, it is much too expensive to manufacture patterns by means of scoring knives, because special tools with suitable scoring knives and scoring grooves (band steel cutter and bottom sc
REFERENCES:
patent: 2075287 (1937-03-01), Jagusch
patent: 2679104 (1954-05-01), Whitton
patent: 2996961 (1961-08-01), Polayes
patent: 3294392 (1966-12-01), Dunham
patent: 3308723 (1967-03-01), Bergh
patent: 4544367 (1985-10-01), Vossen
Holder Karl
Ulmer Walter
Greigg Edwin E.
Smith James G.
Terrell William E.
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