DE1064743B - Cutting unit for Haeckselmaschinen with obliquely arranged disc knives working as swash plates - Google Patents

Description

GERMAN

For chopping machines, cutting units designed in the manner of a knife drum are on the drive axle inclined, known as swashplate working disc knives. These disk knives in order to be able to pass along the straight counter surface during the tumbling movements, elliptical in shape. This elliptical shape is not only difficult to manufacture in production, Sharpening such knives is also difficult to carry out. These disks also have none Infeed effect on, which is why they have to be connected upstream of driven feed rollers. One Changing the cutting length can only be done by advancing the material to be cut or by a Change the number of revolutions of the cutterhead. These are all undesirable imperfections. Therefore, circular cylindrical knives are sought, which are known as such and which are lighter can be produced as elliptical knives and are also easier to resharpen.

The chopping machines are however with a cylindrical circumference having disc knives equipped and work these in an inclined arrangement as swash plates, so you have to constantly counteract them to guide a system acting as a counter knife, special precautions must be taken, namely a special design of the contact surface, because with the tumbling movements the distance changes the contact point of the knife against the rotating roller serving as a counter surface opposite the Axis of the drive shaft.

If a roller rotating in the opposite direction to the disc knives is used as the system, this can happen changing distance between the axis of the drive shaft and the contact surface of the disk knife on the Roll according to the invention are taken into account that the roller serving as a plant in the the respective area of the wobbling movement of each circular knife on its circumference with a side view elliptical, concave recesses is provided, the lying in the middle greatest depth is the greatest radial distance between the circumference of the disk knife and the axis of the drive shaft is equivalent to.

In this embodiment, an elliptical, screwed or milled concave recess. The resulting limiting curve in side view this recess corresponds to the course of the contact point of the circular knife during a return and reversing its tumbling motion, after which it is in every position of this knife and in every position the roller serving as a plant is allowed to position the two parts against one another.

Cutting unit for chopping machines
with on the drive axle
obliquely arranged disc knives working as swash plates

Applicant:
Josef Westner,
Rosenheim (Obb.), Gillitzerstr. 10

Josef Westner, Rosenheim (Obb.)
has been named as the inventor

The invention is explained in more detail using an exemplary embodiment.

Fig. 1 shows a diagrammatic side view of the cutting mechanism with only one represented disk knife ;

Fig. 2 shows the same embodiment in a schematic side view with several circular knives.

The disc-shaped knife 2, 3, 4, 5, etc., have circular cylindrical periphery and arranged on a drivable shaft 1 at an angle a to the vertical plane determined. They therefore perform tumbling movements as the corrugations revolve.

As a counter-surface for this circular knife is a roller 6, which is arranged approximately perpendicular under the drive shaft 1 , and at such a distance that the circular knife, when they assume the extreme oblique position to one side, against the roller 6 on the top 8 to Plant come.

While the knives 2, 3, 4, 5 move from this one extreme oblique position into the opposite extreme oblique position, traversing the noted curve path 7 and then resting against the roller at 10 , the respective disc edge moves on a curve like this one is noted in FIG. 2 between points 8 and 10. The distance between the edge of the disk and the axis of the drive shaft 1 is therefore subject to constant change.

In order to take this change in distance into account, according to the invention, the roller 6 is provided with a recess in the area of each disc knife 2 on the jacket, which runs concave elliptically between points 8 and 10, i.e. over a length 11, in a side view in the middle lying greatest depth 12 the greatest radial

909 610/102

Claims (7)

distance of the circumference of the circular knife from the axis of the drive shaft 1 corresponds. The respective disk edge moves in this recess on the way from 8 to 9 to 10 and back along the noted straight line 7. The rotation ratio of the shaft 1 to the roller 6 is arbitrary here. With these circular cylindrical disc knives, which are much easier to manufacture, the material to be cut is fed in from the front. During the rotation of these circular knives, which are arranged in a fixed inclined position, along the support on the roller rotating in opposite directions, a pressure cut takes place. The cutting length is regulated by the distance between the discs and depends on the angle of inclination of the disc knife to the shaft. The inclined position of these circular knives to the counter support runs through the cutting angle 75 ° -90 ° - 75 °, so it is more favorable than in known designs in which the elliptical shaped circular knives run through a cutting angle that runs from 45 ° over 90 ° to 45 ° compared to the counter knife . The following advantages, which are inherent in the design according to the invention, can be ascertained over the known designs: 1. The circular knives in their cylindrical shape are significantly easier to manufacture than the elliptical discs. Resharpening such circular knives is much easier than the elliptical knife, where there is a risk that the resharpening will be uneven takes place, which is why an always identical permanent system can be lost after several re-sharpening. 2. The subject of the invention requires much lower circulation numbers and works z. B. with circulations of 90 tours per minute, while known types with circulations on average work from 600 tours per minute. The power requirement for the subject of the invention is therefore whole considerably less. 3. The subject of the invention is characterized by an independent collection of the goods required so no additional funding bodies and is therefore weight-wise in this respect as well lighter and cheaper. Claim: Cutting unit for chopping machines with obliquely arranged on the drive axis, as Swash disc working disc knives, which are constantly guided against a counter-surface, thereby characterized in that the roller serving as a counter-position is in the respective area of the tumbling movement of each circular knife on its circumference with elliptical in side view, concave recesses is provided, the greatest depth lying in the middle of the greatest radial distance of the circumference of the disc knife from the axis of the drive shaft is equivalent to. 1 sheet of drawings ® 909 610/102 8.