Automatic trimming machine with split rotary knife assembly

Manufacturing container or tube from paper; or other manufacturi – With cutting – breaking – tearing – or abrading – With scrap material separation or removal

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Details

493357, 493359, 83665, B41F 1356

Patent

active

058239340

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

1. Field of the Invention
The present invention relates to automatic trimming machines for web presses and a knife blade assembly therefor, more specifically, toward the manufacture of various sizes of postal cards, insert cards, flyers, coupon books and the like in an on-line process using an automatic trimming machine which may include split rotary knife assemblies.
2. Prior Art
The existing processes for printing and cutting small postal cards and the like involve a separate process for cutting the cards after they have been printed. The prior art process involves slitting the paper on a web press into sheets. The slit sheets are then removed from the web press and cut in a separate process. This two step process is somewhat labor-intensive and time-consuming.
Additionally, the changing and servicing of knife assemblies in prior art systems have been labor-intensive. Replacing or servicing an integral blade of knife assemblies may take up to four hours due to the disassembly required to remove the integral blade from the supporting shaft or hub. Split blade assemblies have been developed for use in various areas which can reduce some of these problems. Examples of known split blade assemblies are found in U.S. Pat. Nos. 3,850,069; 3,899,955; 4,570,517 and 4,584,920.
The object of the present invention is to overcome the aforementioned drawbacks of the prior art. A further object of the present invention is to provide an automatic trimming machine for use with a web press which allows the press to cut various sized postal and insert cards, flyers, coupon books and the like in a single on-line process. A further object of the present invention is to provide a split ring knife blade assembly for automatic trimming machines and the like which provides for quick replacement of the knife blade.


SUMMARY OF THE INVENTION

The present invention provides an automatic trimming machine for use with a web press which is adapted to cut various sizes of postal and insert cards, flyers, coupon books and the like in a single continuous on-line process. The automatic trimming machine of the present invention includes a paper perforation wheel installed on a trolley of a web press. The paper perforation wheel perforates a web of paper along a folding line. The web press will sever the web of paper into individual sheets of paper in a conventional fashion. A paper folding device will fold the sheets of paper along the folding line forming a backbone along a first side of the folded paper.
The folded paper will then proceed to a preliminary trimming unit which trims the folded paper. The preliminary trimming unit includes a first, a second, a third and a fourth knife. The first knife is positioned on a second side of the folded paper for cutting the folded paper to a specified size. The second knife is positioned on the first side of the folded paper for cutting the backbone from the folded paper. The third and fourth knives are positioned to trim the top edge and bottom edge, respectively, from the folded paper. A vacuum removal device is positioned above the second knife for removing the severed backbone. In one embodiment, the knife assemblies of the preliminary trimming unit may be automatically, individually adjustable.
The paper is then cut into distinct final products in a finish trimming unit. In one embodiment, the finish trimming unit represents a separate device which can be attached to the end of a conventional three knife trimmer or similar device. The finish trimming unit includes a frame, with a feeding mechanism mounted on the frame for transporting material to be cut through the finish trimming unit. A lower knife shaft is mounted on the frame below the path of the material through the finish trimming unit, with a plurality of lower knife blades attached to the lower knife shaft at spaced locations. An upper knife shaft is mounted on the frame above the path of the material, with at least one upper knife blade adjustably positioned on the upper knife shaft. A driving mechanism

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