DE3042472A1 - PLATE KNIFE HOLDER FOR A PAPER REEL CUTTING MACHINE OR THE LIKE. - Google Patents

Description

Patent attorneys Dipl.-Ing.W.Beyer, Dipl.-Wirtsch.-Ing.B.Jochem Staufenstrasse 36 6000 Frankfurt / Main

Applicant:

Men's

Elio CAVAGNA Via Milano 13 San Zenone al Lambro (Milano) Italy

Antonio COLOMBO Via Lomeni 4 Magenta (Milano) / Italy

Description :

Plate knife holderuncr in a paper roll cutting machine or the like.

130022/0769

description

The invention relates to a plate knife holder a paper roll cutting machine or the like.

On paper roll cutting machines, the wide paper web is cut into the desired roll widths with plate knives and at the same time into hard-sounding rolls wrapped for shipping. The plate knives come into contact with the help of plate knife holders q brought with the paper and set in rotation by the movable paper web, at the same time cutting the paper web will.

In the case of the known plate knife holders, the plate knife is stored in a manually or mechanically operated support element, and the one from the plate knife, the holder as well as the drive means existing unit has a very complicated structure and is therefore expensive both in terms of the design of the components and the time it takes to assemble them.

The object of the invention is to provide such a plate knife holder to the effect to simplify that it consists of only the smallest possible number of components and of very simple design and easier assembly.

According to the invention this object is achieved by two im Transverse spacing arranged side by side and through the top

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a web to a fork-shaped knife holder with each other connected bearing plates, between which the circular knife is freely rotatably mounted, the bearing plates are articulated at about the same height as the plate knife on a support bracket with means for swiveling up and down of the knife holder and thus raising and lowering of the \ circular knife.

In an advantageous embodiment of the invention, the means for moving the knife holder up and down are from a pneumatic or hydraulic power cylinder carried by a cantilever at the upper end of the support bracket formed, the piston of which the knife holder can be moved downward against spring force.

The power cylinder and its piston preferably have a flat rectangular cross-section, and it is also expedient is that the piston is sealed against the power cylinder by a lip seal. The guide of the piston can furthermore take place in that a plunger guided in a bore in the projection is fastened to the underside of the piston whose lower end rests on the web of the knife holder,

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In this case, the knife holder is expediently in contact with a tension spring which is braced against the support bracket Plunger held. It is useful here to use compression springs between the piston and the projection of the support bracket arranged to return the piston to the raised position.

According to a special feature of the advantageous embodiment of the invention, the support bracket with a Clamping device provided for attaching to a horizontal clamping rail. With this measure you can easily Way, attach any number of such knife holders next to each other at any distance.

A preferred embodiment of the invention Knife holder is explained in more detail below with reference to the drawing. Show it :

Fig. 1 is a vertical section through the knife holder according to line A-A in Fig. 2,

Fig. 2 shows a vertical section through the knife holder along line B-B in Fig. 1 and

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3042A72

3 shows a horizontal section through the knife holder according to line C-C in Fiq. 1.

The one shown. Krel8NW «taWWKM fcSStetfc gflfl tiXSX. console 7, which can be attached to a horizontal support bar 8 in addition to any number of other such knife holders by means of a clamping device 9. The support bracket 7 has at the upper end a projection 7 extending away from the clamping bar 8 and supports two bearing plates 24 arranged at a transverse distance on a bearing pin 6, which are connected to one another at the top by a stea 23 to form a fork-shaped knife holder 3. Between the bearing plates 24 a circular knife 5 is mounted on a ball bearing by means of a Laaer pin 25, which is held in the raised position by means of a Zuafeder 4 clamped between the bearing plates 24 and the support bracket 7.

A pneumatic or hydraulic power cylinder 20 with a piston 1 is attached to the recess 7 ^1. The piston 1 and the power cylinder 20 have an elongated rectangular cross-section. The piston 1 carries on its upper side a sealing element with a lip seal 19 for sealing a working chamber 21 within the power cylinder 20

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which compressed air or pressure oil via a connection hole is feedable.

On the underside of the piston 1, a tappet 10 is attached, which ^{protrudes through a bore 22 in the projection 7 1} and is guided in this. The lower end of the plunger 10 rests on the web 23 of the knife holder 3 and moves it with the circular knife 5 down into the working position when compressed air or hydraulic fluid is passed through the bore 11 into the working chamber 21 of the power cylinder 20. Helical compression springs 2, which are braced between the piston 1 and the projection 7, lead the piston 1 back into the upper rest position when the working chamber 21 is relieved.

The knife holder shown and described consists thus from just a few individual parts that can be put together quickly. She also takes a very low rate Width that makes it possible to use any number of such knife holders at any distance to be attached next to each other on the terminal strip.

130022/0769

Claims (8)

Claims .J Plate knife holder for a paper roll cutting machine or the like, characterized by two transversely arranged side by side and at the top by a stea (23) interconnected to form a fork-shaped knife holder (3) Bearing plates (24) between which the circular knife (5) is freely rotatably mounted, the Laaer plates (24) at about the same height as the plate knife (5) are hinged to a support bracket (7), which with Means (20, 1, 10) for pivoting the knife holder (3) up and down and thus raising and lowering the circular knife (5) is provided. 2. Plate knife holder according to claim 1, characterized in that the means for pivoting the knife holder (3) up and down from one of a projection (7 ¹ ) at the upper end of the support bracket (7) carried pneumatic or hydraulic power cylinder (20) are formed, of the piston (1) of the Knife holder (3) can be moved downwards against spring force. 3. plate knife holder according to claim 1 or 2, characterized in that the Power cylinder (20) and its piston (1) have a flat one Have rectangular cross-section. 4. plate knife holder according to claim 3, characterized in that the piston (1) against the power cylinder (20) through a lip seal (19) is sealed. C 3619 / 11/10/1980 130022/0769 5. plate knife holder unit according to claim 3 or 4 *, characterized in that on the underside of the piston (1) in a bore (22) of the projection (7 ¹ ) guided ram (10) is attached, the lower end of which on the web (23 ) of the knife holder (3) sits on. 6. Plate blade holder according to claim 5, characterized aekennzeichnet that the knife holder (3) is held by a geaen the stü ^tz console (7) guyed tension spring (4) into abutment against the plunger (22). 7. plate knife holder according to claim 6, characterized in that between the piston (1) and the Auskraaunq (7 ') of the support bracket (7) compression springs (2) to return the piston to the raised position are arranged. 8. plate knife holder according to one of the preceding claims, characterized in that that the support bracket (7) with a clamping device (9) for fastening to a horizontal clamping rail (8) is provided. C 3619 / 11/10/1980 130022/0769