DE1135813B - Rotating circular knife for cutting sticks of cigarettes or the like and a method for its production - Google Patents

Description

GERMAN

PATENT OFFICE

M3532im / 79b

REGISTRATION DATE: SEPTEMBER 12, 1957

NOTIFICATION OF REGISTRATION AND ISSUE OF
EDITORIAL: AUGUST 30, 1962

The invention relates to a rotating circular knife for cutting cigarette rods, strands of Filter tip material for cigarettes, tobacco, and materials of similar nature and machinability as well as process for its preparation. The cigarette machines used to cut through the Knives used for the cigarette rod must necessarily be very thin, and because of the cutting work is quite heavy, they have to be constantly, i. H. after each cut. With a mouthpiece provided cigarettes or filters for insertion into cigarettes, the cutting through is extreme difficult because certain filters, e.g. B. those made of crepe, are comparatively hard, and z. B. the from Filters made from cotton require a very sharp cutting edge.

The required grinding operations require well-engineered grinding devices and drive devices to do so, and in some cases caused the sanding dust further difficulties. In addition, the constant sharpening makes quite some use of the knives quickly and the replacement requires significant costs.

There are already rotating circular knives for cutting cigarette rods, rods of filter mouthpiece material for cigarettes and materials of a similar nature and machinability with a metal body, the cutting edge of which is beveled on at least one side is known. According to the invention there is now the knife from a thin, the cutting edge forming, fixed between two layers of metal Intermediate layer made of diamond cutting particles. The diamond particles can be known per se Way through electrodeposited metal that agglomerates with the particles forms, be connected to the rest of the knife in one piece.

There are various ways of making knives of this type, and the invention also relates to one of these Production method.

The drawing illustrates exemplary embodiments of the invention, specifically shows

1 shows a cross-section, not to scale, through part of a circular knife during its manufacture, which contains a thin layer of diamond inside the metal body,

2 shows a cross-section, not to scale, through the same knife in the finished state,

Fig. 3 is an end view of the finished knife, approximately • drawn to scale,

Fig. 4 is a plan according to Fig. 3 and

5 shows a further embodiment of a circular knife.

Revolving circular knife for cutting

of cigarette rods or the like.
as well as process for its manufacture

Applicant:
Molins Machine Company Limited, London

Representative: Dr.-Ing. B. Bloch, patent attorney,
Berlin-Wilmersdorf, Ballenstedter Str. 17

Claimed priority:

Great Britain September 13, 1956 (No. 27,984)
and January 17, 1957 (No. 1837, No. 1838 and No. 1839)

James Ernest Morris and George Smith,

Deptford, London (Great Britain),

have been named as inventors

In FIGS. 1 to 4, 1 represents a metal mold which corresponds to the shape of one side surface of the knife and the surfaces 2 of which are coated with graphite, as is known in electroplating. the The mold is then placed in an electroplating bath and a metal, such as nickel, is deposited on it, until the part of the knife body which extends up to line 3 is formed. The outside surface this precipitate is then covered with a thin layer 4 of diamond dust and the shape again brought into the bath and the electroforming process continued until the dash-dotted line Lines indicated and denoted by 5 applied metal part to the previously deposited part is. Since nickel, for example, does not easily settle on nickel, a thin layer of copper can be applied first Surface to be applied at 3. Similar coating layers can be used if others Metals other than nickel can be used to form the knife body. After removing it from the Bath and the shape, the edge of part 5, which is marked in Fig. 1 by hatching, is processed, so that the finished knife the in Fig. 2

Has cross-section shown. The center hole required for a circular knife can be cut during the Electroplating by inserting a pin 6

209 635/64

through the center of the mold. The tenon is covered with asphalt or some other varnish coated to prevent metal from depositing thereon. In Figs. 1 and 2, the knife thickness is Exaggeratedly thick drawn so that you can see the details better. In practice are the knives are about 0.1 to 0.5 mm thick, depending on the diameter and the objects to be cut. The diamond layer can be about 0.1 mm thick, but it is preferably thinner so that it is a results in an extremely sharp edge.

After the diamond layer on the partially shaped The knife body is placed, the then deposited nickel forms an agglomeration of Diamond and deposited metal and firmly attached the diamond dust to the knife body. There If the sharpest possible cutting edge is to be achieved without further processing, this is the one used Diamond material of microscopic dimensions. Particles about 6 microns in diameter are suitable, although of course the various particles will be different in size can. It is essential to get the thinnest possible diamond coating.

If necessary, in the manufacture of circular knives, the shape can be designed in such a way that the knife body after the middle it becomes stronger, to a stiff disc with a relatively thin rim obtained as shown in FIG.

In the versions described, this is used Metal nickel which has been found to be satisfactory. But it can also be a different metal can be used in its place.

It has been shown that a knife with such Diamond cutting works satisfactorily for a long time and grinding devices are dispensed with can. There is also no dust problem, and the sharpness of the cutting edge brought about by the manufacture determined by the knife is maintained for a long time.

When ordinary steel knives are used for the purposes mentioned, their cutting action appears depend to a large extent on the grain size of the grinding wheel used, and by the continued sharpening and wear and tear gives the knife a slightly roughened edge, which when used a suitable grinding wheel shows the best results. A disc with diamond cutting particles can be made to have a rough edge, and this can best be done by be achieved that one chooses the diamond particles accordingly. It is known to those skilled in the art and does not belong to the invention how the roughening must be in order to achieve the best cutting effect.

Claims (6)

PATENT CLAIMS: 1. Circular circular knife for cutting cigarette rods, strands of filter mouthpiece material for cigarettes and materials of a similar nature and machinability with a metal body, the cutting edge of which is beveled on at least one side, characterized in that the knife consists of a thin, the cutting edge forming, between two metal layers attached intermediate layer consists of diamond cutting particles. 2. Knife according to claim 1, characterized in that the diamond particles are known per se Way by electrodeposited metal, which with the particles one Forming agglomeration, connected to the rest of the knife in one piece. 3. Circular knife according to spoke 1 or 2, characterized through a recess that extends around the cutting edge parallel to the central axis of the Knife extends and are fixed in the diamond cutting particles. 4. Knife according spoke 1 or 2, characterized in that its metal body through deposits made in a known galvanoplastic way is formed. 5. A method for producing a knife according to spoke 3, characterized in that the deposition of the metal is carried out until one side of the knife and one side Side of one of the metal layers or the recess-forming surface are made, whereupon a layer of diamond particles of the desired thickness is placed on this surface and the Ablagerang is then continued until the knife body is completely finished, with the Diamond particles are attached to the knife body in that they are deposited with the Metal are agglomerated and fill the spaces between the particles. 6. The method according spoke 5, characterized in that the area before the continuation the metal deposit is coated with another metal. Considered publications:
German Patent Nos. 4,024,622,823;
Austrian Patent No. 162 120;
U.S. Patent Nos. 2,571,772, 2,796,706. 1 sheet of drawings © 209 638/64 8.