Cutting – Tool or tool with support – Toothed blade or tooth therefor
Patent
1997-01-22
2000-07-18
Rachuba, M.
Cutting
Tool or tool with support
Toothed blade or tooth therefor
83840, 83844, 83934, B27B 3302
Patent
active
060891386
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of The Invention
The invention concerns a rotating, drivable cutter for the cutting of printed products or lengths of flexible materials, such as paper, plastic, fabric, leather or metal.
2. Background Of The Related Art
Such a cutter is disclosed in DE - B - 37 19 721 in which a knife holder is formed at the rear side facing away from the cutting plane by a ring-shaped surface that slopes toward the outside. The cutting knives are arranged on the ring-shaped surface in guide grooves such that they can be moved and fixed in place with respect to the cutting plane. The cutting knives are fixed in place with screws that project through a slot in the knife shank and fit flush against the latter with the head. The cutting force is absorbed in part by the screws as bending and shearing forces, and the shank of the cutting knife is weakened considerably by the slot so that this a design is inadequate per se.
It is the object of the invention at hand to create a cutter of the aforementioned type for which the disadvantages mentioned have been corrected, in which the guide grooves are protected, and which permits a faster knife replacement.
SUMMARY OF THE INVENTION
The solution according to the invention is a rotatably driven cutter for the cutting of printed products or lengths of flexible materials, such as paper, plastic, fabric, leather or metal, composed of a circular knife holder, which is connected removably to a drive shaft and has knives that are distributed across and project over the circumference and can be adjusted in guide grooves, which are fastened to a clamping arrangement that extends conically from the hub to the circumference of the knife holder, wherein the knife ends that project at the circumference for the knife holder form a cutting plane that is perpendicular to the rotational axis of the cutter, characterized in that the knives have a clamping cross section that can be moved in dovetail-shaped guide grooves and can each be locked in place in pairs by a clamping plate that is arranged between them and which can be tightened against the knife holder. The clamping cross section for the shank remains constant.
BRIEF DESCRIPTION OF THE DRAWING
The invention is explained in the following with the aid of an exemplary embodiment and by referring to the drawing, to which reference is made with respect to all details not explained further in the description. The drawing shows:
FIG. 1 a frontal view of a cutter; and
FIG. 2 a cross section of the cutter along the line II--II in FIG. 1.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
FIGS. 1 and 2 show a rotating, driven cutter 1 for cutting single or multiple page printed products or material lengths, which comprises a circular knife holder 2 having a hub 3 which is mounted to a drive shaft 14 for a gear such that it can be detached again. Through holes 4 for screws are provided for this. A conical surface extends from hub 3 in a radial direction toward the circumference of the knife holder 2, on which radially extending guide grooves 5 are provided that are distributed over the circumference and end in front of hub 3.
One pair of guide grooves 5 with a clamping plate 6 in between form a clamping arrangement for the cutting knives 7. Cutting knifes 7 can be moved in the guide grooves 5 and are clamped in by their shank 8.
The shank 8 of the cutting knife 7 has a trapezoid cross section, so that it fits longitudinally displaceably into the dovetailed guide groove 5.
Ends 9 of cutting knives 7 project over the circumference of the knife holder 2 and form a cutting plane 11, which is located in front of the face of knife holder 2 and runs perpendicular to the rotational axis 10 of the cutter 1.
In conformance to the guide grooves 5 or cutting knives 7, which are here arranged at a pointed angle, the clamping plate 6 is designed in a trapezoid shape with the same angle and is connected to the knife holder 2 through a fastening device and two screws. The clamping plate 6, which is tapered toward the rotational axis
REFERENCES:
patent: 1150555 (1915-08-01), Thau
patent: 1650290 (1927-11-01), Metzger
patent: 1728264 (1929-09-01), England
patent: 1861928 (1932-06-01), Loeffelman
patent: 1879574 (1932-09-01), Sproul
patent: 3706252 (1972-12-01), Hawkes et al.
patent: 3726167 (1973-04-01), Barbour, Jr.
patent: 3828409 (1974-08-01), Aspinwall
patent: 3990337 (1976-11-01), Barbour, Jr.
patent: 4132138 (1979-01-01), Miyamoto
patent: 4303113 (1981-12-01), Anderson
patent: 4418593 (1983-12-01), Frydel
patent: 4480518 (1984-11-01), Futterer
patent: 4840098 (1989-06-01), Gammerler
patent: 5165319 (1992-11-01), Snyder et al.
patent: 5367928 (1994-11-01), Geiser et al.
Langenegger Daniel
Schoenenberger Joerg
Grapha-Holding AG
Rachuba M.
Spencer George H.
Wells Ashley J.
LandOfFree
Rotating, drivable cutter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Rotating, drivable cutter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Rotating, drivable cutter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2025437