DE1192920B - Device for cutting cardboard tubes - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. α .:

B 31 c

German KL: 54c-l

Number: 1192 920

File number: H 51113 VII b / 54 c

Filing date: December 12, 1963

Open date: May 13, 1965

The invention relates to a device for cutting cardboard tubes with at least a circular knife, preferably slidable on a support, which is equipped with a cylindrical, the mandrel carrying the cardboard tube cooperates, the mandrel extending over the entire circumferential surface having extending annular groove for each circular knife.

However, the known devices of this type have the disadvantage that the cutting edge of the circular knife usually becomes dull after a short period of use, since despite careful adjustment of the The pressure exerted on the knife does not prevent the knife from cutting through the Cardboard tube comes into direct contact with the substrate.

Attempts have been made to prevent this by increasing the distance between the outer ones, which limit the annular grooves Side edges taking into account the special design of the circular knives used is dimensioned so that these side edges limit the depth of penetration of the knife and accordingly keep the knife edge at an appropriate distance from the bottom of the groove. With the known Devices in which the annular grooves provided on the mandrel are made from the material of the dome itself are, these side edges are subject to very heavy wear. The ring grooves are thereby gradually wider, and you can no longer prevent the circular knife after cutting through the cardboard tubes come into contact with the bottom of the groove again and become blunt will. Replacing the entire cathedral would be too costly in this case. According to the invention this deficiency is now remedied by the fact that the annular groove is made in an applied to the dome a hard material, preferably made of hardened steel ring, the outer surface of which with the Surface of the dome runs flush, is arranged and the outer side edges of the annular groove as the Penetration depth of the circular knife limiting stops are formed.

According to the invention, the ring can also consist of two ring disks with two side surfaces abut one another, the annular groove being provided by one in at least one of these side surfaces Recess is formed. The ring or the ring disks can also have an internal thread provided and screwed onto the cylindrical mandrel.

Such an embodiment has the particular advantage that the individual ring disks can easily be removed from the device for cutting pipes
made of cardboard

Applicant:

W. Hamburger, Kartonagenwerk, Pitten

(Austria)

Representative:

Dipl.-Ing. F. Weickmann,

Dr.-Ing. A. Weickmann,

Dipl.-Ing. H. Weickmann

and Dipl.-Phys. Dr. K. Fincke, patent attorneys,

Munich 27, Möhlstr. 22nd

Claimed priority:

Austria of December 18, 1962 (1A9875 / 62)

are changeable and the annular grooves or the distance between the side edges delimiting them, if necessary can also be adapted to the ring knives used in each case.

The invention is described below using an exemplary embodiment which is shown in the drawing is explained in more detail. In this shows

F i g. 1 in a schematic representation the view of a cutting mandrel section provided with two metal rings and a circular knife cooperating with them,

F i g. 2 shows a side view of the device according to FIG. 1 and

F i g. 3 shows a detailed section through the circular knife and through annular disks applied to the dome on a larger scale.

In the embodiment shown in the drawing, a known per se, for. More colorful the pressure of an adjustable spring or the like standing circular knife 1 against a on a cutting arbor 2 pushed cardboard tube 3 brought into action. Such circular knives are guided in known way mostly by knife holders, which are either on a support or around a common, parallel to the axis of the cutting mandrel arranged support arm pivotable and on this can be determined at a predetermined distance. For the sake of simplicity, the circular knife 1 is in the drawing shown only schematically and the holder, guide, suspension, etc. of the same have been omitted

509 569/13

the. The cutting mandrel 2 together with the cardboard roll 3 pushed on this is also by a drive, not shown, brought into rotating motion in the direction of the arrow. This will also be on the cardboard tube 3 acting knife 1 rotated in the opposite direction. Opposite the circular knife 1 a ring 4 is arranged on the cutting mandrel 2, which in the exemplary embodiment, as in FIG. 3 shows consists of two circular disks 4 ', 4 ", which lie against one another with two side surfaces and their outer surfaces run flush with the outer surface of the dome. The annular disk 4 'is in the vicinity of the circumference a recess forming an annular groove 5. The annular groove 5 could just as well go through a recess is formed in the annular disk 4 "or by recesses in both annular disks 4 ', 4" be. The ring disks 4 ', 4 ", which are preferably designed as hardened steel disks, can pushed onto the end of the dome 2 or with an internal thread onto the end of the dome 2 be screwed on. The circular knife 1 acting on the cardboard tube 3 is set so that the After cutting through the cardboard roll 3, the cutting edge 6 can safely penetrate a little into the annular groove 5 can. Since the annular groove 5 is much narrower than the circular knife 1, form the outer side edges the annular groove 5 stops for the circular knife 1 and keep the knife edge 6 at a distance from the bottom of the groove and thus extend their effectiveness many times over. The outer side edges the annular groove 5 also form a fixed abutment when the cardboard roll 3 is cut.

The cutting dome 2 can be made up of several individual ones that can be connected to one another at the end and are exchangeable Pieces are formed. The distance at which the rings 4 are arranged on the dome 2, depends on the length in which the cardboard tube 3 pushed onto the dome 2 is to be cut. Of course, several can also be arranged at a corresponding distance from one another Circular knife 1 brought into action at the same time on a cardboard tube pushed onto the mandrel 2 will.

Claims (3)

Patent claims: 1. Device for cutting cardboard tubes with at least one, preferably on a support displaceable circular knife, which with a cylindrical, the cardboard tube carrying Dome cooperates, the dome having an annular groove extending over the entire circumferential surface for each circular knife, thereby characterized in that the annular groove (5) in one applied to the mandrel (2), from one hard material, preferably made of hardened steel ring (4), the outer surface of which with. the surface of the dome (2) runs flush, is arranged and the outer side edges of the Annular groove are designed as the penetration depth of the circular knife (1) limiting stops. 2. Apparatus according to claim 1, characterized in that the ring (4) consists of two annular disks (4 ', 4 "), the annular groove (5) from one in at least one of these annular disks (4 ', 4 ") provided recess is formed. 3. Apparatus according to claim 1 or 2, characterized in that the ring (4) or the Ring disks (4 ', 4 ") are provided with an internal thread and can be screwed onto the mandrel (2) are. Considered publications:
German Patent No. 307 727;
U.S. Patents No. 1,817,481, Re 23,899. 1 sheet of drawings 509 569/13 5.65 © Bundesdruckerei Berlin