DE1264740B - Device for guiding the band knife of splitting machines - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

B29c

German class: 39 a2-17 / 10

Number: 1264 740

File number F 36125 X / 39 a2

Filing date: February 26, 1962

Opening day: March 28, 1968

The invention relates to a device for guiding the band knife of splitting machines for cutting preferably elastic or soft materials, especially flexible foams on a natural or plastic basis.

There are known guide devices for the band knife of splitting machines in which the Band knife supported by a cutting bar serving as a guide at least to the cutting length will. The cutter bar is a rigid bar construction in which the band knife of Parts is limited, which are attached to a cross-sectionally wedge-shaped beam.

Another known design of the guide device is that guide plates of not very large thickness for the band knife are provided with a rear web a Form a structural unit that is attached to a guide rail. This also results in a Beam construction, with the stability of the guide plates only due to the beam-like guide rail is achieved.

The relatively large cross-section in the known knife guides means that the over the knife guide sliding material is severely deformed or bent. This can easily cause a deviation of the cut from the intended cutting plane, especially at the beginning and at the end of the Cut occur. The deformation of the severed material web caused by the sharp bending causes a relatively high pressure and high friction between the material and the knife guide. This effect is due to the pressure of the Top roller reinforced. With thin layers there is a risk that they will not have the proportionate can slide large depth of the knife guide as a beam construction. Soft, adhesive Material is difficult to process with the previous design of the knife guide. The attachment of guide plates on a beam running along the entire length in the cutting area of the machine is required, can also lead to the material to be cut getting caught on the fastening elements. Furthermore, there is the possibility that by heating the interconnected plates bending of the beam construction can occur. As these plates also increase the material pressure of the material to be cut, there is a tendency for the cutting knife to close in the barrel clamp. Furthermore, the adjustment of the beam construction is complex.

Device for guiding the band knife
of splitting machines

Applicant:

Fecken-Kirfel, 5100 Aachen, Goebbelgasse 15

Named as inventor:

Josef Schröder, 5102 Würselen

The object of the invention is to guide the band knife of splitting machines of the type described above Kind to design simpler and to improve significantly in effect and function.

The invention is characterized in that the cutter bar of the knife as at least one in Longitudinally held under tension steel band is formed.

Such a design of the guide device results in significant advantages over this the well-known beam construction. The cross-section of the knife guide can be extraordinary be kept small and flat. In the case of a bar

construction as a knife guide, when this beam is bent, the length is the power of three one, while in the case of the tensioned steel band, the length due to the stress on tensile only enters into a single power. In the case of large working widths of the splitting machines, the formation of the results Knife guide as a tensioned steel band a high material utilization, namely the material is with the tensioned steel band is fully utilized, while with the usual beam construction only off Strength reasons for the deflection made a corresponding accumulation of material must become. Such an accumulation of material easily leads to higher friction during the cutting process between the product to be cut and the knife guide. The tensioned steel belt is in the area of the whole Working width of the cutting machine free from one

809 520/656

Fastening element, so that the risk of the goods getting caught on such is eliminated. Furthermore, when the steel band is tensioned, it expands when it is heated compensates in the pretension of the belt. Furthermore, the tensioned steel strip can be used as a knife guide Due to its high tension, print the goods more cheaply. There is also a Simplification of the adjustment compared to a beam construction for the knife guide. the Steel plates on a beam construction have to be adjusted to the rotating band knife be aligned. On the other hand, the tensioned steel belt is held by the high tensile stress himself always on his own level. The cross section of the one made up of the tensioned steel band Knife guide is so small that it can be arranged exactly symmetrically and thus the strength the layer to be split off is no longer restricted by the shape of the knife guide.

It is advantageous to have several independent steel strips at a distance from one another as knife guides intended. Furthermore, the steel strip can be provided with cutouts or perforations be, which are advantageously arranged along the neutral zone to the degree of utilization of the material increase when twisted.

According to a further feature of the invention, the steel strip is inserted into a tenter frame, of which at least one frame leg is pivotably mounted about a support point. This will the steel belt kept in tension with simple means.

The invention is explained below with reference to the exemplary embodiments shown in the drawing.

F i g. 1 schematically shows a cross section through the knife guide;

Figure 2 is a top plan view of Figure 1;

F i g. 3 illustrates a side view in the direction of arrow III of FIG. 2 in a smaller representation;

F i g. Fig. 4 shows a further embodiment for guiding the band knife;

Figure 5 is a cross-section through the knife guide of Figure 5. 4;

F i g. 6 corresponds to the cross section of FIG. 5, but with a different position of the knife guide;

F i g. 7 shows a third embodiment of the knife guide in cross-section in plan view; F i g. 8 is a top plan view of FIG. 7th

A block of material 3 to be cut rests on a table 2 which can be moved back and forth in the direction of arrow 1 or on a rotating conveyor belt. B. soft plastic-based foam, foam rubber, sponge rubber and the like., Is. The cutting or splitting off of layers of any thickness takes place by means of a band knife 4, which is sharpened on one or both sides on the side facing the material block 3. The band knife 4 is advantageously endless and guided around two deflection disks 5 and 6. The band knife 4 or the table 1 or the like or both parts can be adjusted in height relative to one another.

The guide of the band knife 4 consists of a steel band 7 held under tension on one side or, preferably, another steel band 8 on the other side of the band knife 4. The steel bands 7 and 8 can be provided with bevelling la or 8a on the side facing the knife edge be that the sharpening of the band knife 4 can be adapted. The steel strips 7 and 8 can completely cover the width of the band knife. You can be kept taut in such a way that the ends of the steel strips 7 and 8 are used in a tenter frame. This clamping frame has frame legs 9 and 10, which are connected by a tie rod 11 that is adjustable in length. The one frame leg 9 can be on a paragraph

12 of the machine frame rest, while the other frame leg 10 around a support point

13 is pivotably mounted. By tightening the tie rod 11, the frame legs spread 9 and 10 and thus keeping the steel strips 7 and 8 connected to them tensioned Steel strips 7 and 8 can have a cross-section over the clamping length that corresponds to the center plane of the The clamping length becomes stronger, i.e. the belt can be reinforced in the middle. Such a contour of the tape is illustrated in the steel strip 8 with the dashed line 86.

In the embodiment according to FIG. 4 and 5 are the steel strips 14 and serving as guides 15 provided with recesses or perforations 16 running in the longitudinal direction. The steel bands 14,15 can be at an acute angle to the table surface (see Fig. 5) or lying horizontally, as in Fig. 6 is shown. The inclination of the steel belts is expedient so that the pivot point is placed in the knife sheath.

Instead of a wide steel band, the guidance along the width of the band knife 4 can then also take place by means of several steel bands that are spaced apart from one another. In the embodiment according to FIG. 7 and 8, the upper guide of the narrow steel strips 17 α and 176 and the lower guide of the steel belts 18 a and 186. These are advantageously arranged close to the longitudinal edges of the band knife. 4 With very wide band knives, more than two independent steel bands can be provided on one side of the band knife.

Claims (4)

Patent claims: 1. Device for guiding the band knife of splitting machines for separating preferably elastic or soft materials, in particular soft foams on natural or Plastic base in which the band knife is guided by a cutter bar is supported at least to the cutting length, characterized in that the cutting bar of the band knife (4) as at least a steel band (7, 8) held under tensile stress in the longitudinal direction is formed. 2. Apparatus according to claim 1, characterized in that several, at a distance from one another horizontal and independent steel strips (17 a, 176; 18 a, 186) are arranged. 3. Apparatus according to claim 1, characterized in that the steel strip (14, 15) with Recesses or openings (16) is provided. 4. Device according to one of claims 1 to 3, characterized in that the steel strip (7, 8) is inserted into a clamping frame (9, 10, 11), of which at least one frame leg (10) is pivotably mounted about a support point (13). Considered publications: German Patent No. 920 034; German utility model No. 1745 441, 000, 1792757. 1 sheet of drawings 809 520/656 3.68 ® Bundesdruckerei Berlin