DE1134500B - Foam cutting machine - Google Patents

Description

GERMAN

PATENT OFFICE

K32612X / 39a ²

REGISTRATION DATE: AUGUST 2, 1957

NOTICE
THE REGISTRATION
AND ISSUE OF THE
EDITORIAL: AUGUST 9, 1962

The invention relates to a foam cutting machine, with one going up and down in the longitudinal direction and one of its back and side surfaces comprehensive sheath guided knife is provided, the knife and at least that of the Knife edge facing the sheaths with a toothing consisting of teeth and tooth gaps provided and the tooth flanks of the knife and the sheath are sharpened. With previously known cutting machines However, this toothing has pointed teeth and tooth gaps that form the base of the tooth gap converge to a point. With such a toothing, a foam could not be cut cleanly because the tips and the converging tooth space limits the elastic Push foam in front of you when cutting and push it away from the cut. This pushing back of the foam to be cut during the cutting process then has the consequence that none smooth incisions come about and that the zo incision is not in the intended place he follows.

However, as far as knives for cutting machines have already become known, the teeth of which have a These knives also adhere to the cutting edge in a straight line and in the stroke direction the disadvantages mentioned, since the tooth gaps to the tooth gap base also with this type of design converge towards, so the elastic foam when cutting in front of you and away from the interface push away.

In the last-mentioned embodiment, the cutting knife is not guided in a sheath, so that thus the tooth flanks of the sheath which support the cutting effect in the first-mentioned type completely miss.

The particular difficulties encountered in cutting foam are made in accordance with the invention corrected by the fact that the tooth gaps have a shape that widens towards the base of the gap and the Teeth, as is known per se, an expediently straight face cutting edge that runs in the stroke direction exhibit.

With such a design of the knife and the sheath thighs when cutting on the A force component exerts a force component in the material to be cut protruding into the gaps between the teeth, which converts the material to be cut into the Tried to pull in the knife.

In the drawing, an embodiment of the subject matter of the invention is shown schematically. In it shows

Fig. 1 shows a cross section through the sheath and knife, foam cutting machine

Applicant:
Krauss & Reichert

Special machine factory and apparatus construction,
Fellbach (Württ), Stuttgarter Str. 68

Hans Knoll, Stuttgart-Obertürkheim,
has been named as the inventor

FIG. 2 shows a view of the knife in the direction of arrow A in FIG. 1,

3 shows a longitudinal section through the sheath according to section line 3-3 in FIG. 1.

The knife sheath shown in cross section in FIG. 1 with a knife guided therein must be seen think connected to an electric hand-held device, i. H. z. B. a handle-like containing an electric motor Device that has a gear at its front end for converting the rotary motion of the motor into a back and forth forward movement carries. The guide housing for the reciprocating straight knife is then again connected to the face of the gear housing.

The push knife, which performs a reciprocating movement, is denoted by 11 in the drawing. It has at its front edge a sloping ground surface Ua, which forms together with the one side surface of the knife cutting edge 11 b. During its to-and-fro movement, which is indicated in FIG. 3 by a double arrow C, this knife is guided in a sheath which essentially consists of the two sheath legs 12 and 13. The rear ends of these two sheath legs 12 and 13 - seen in the direction of advance of the knife - are firmly connected to one another with the insertion of spacers 14 which leave free flow gaps between them. Spot welding is most likely to be used for this connection. The knife 11 slides up and down in the cavity that remains free due to this U-shaped cross-sectional configuration of the sheath.

The two sheath legs 12 and 13 are also designed with oblique edges that converge towards the knife edge.

209 629/249

surfaces 12 α and 13 α provided, which form cutting edges 12 & 13 c with the inner side surfaces of the sheath legs.

As shown in FIGS. 2 and 3, dovetail-like, that is, rear-engaging cutouts lic are provided in the front face of the knife 11 , which therefore widen towards the base of the cutout. The extending to the knife edge 11 and at a slightly inclination deviating from the perpendicular side edges lld these cutouts lic are still lie by further inclined surfaces on which the inclined surface 11a carrying side of the knife blade-like bevelled 11, so that therefore the knife with both the front end edge 11 b as well as with the cutting edges lld can cut.

As can be seen in FIGS. 2 and 3, the sheath 12 is also provided with dovetail-shaped cutouts (tooth gaps) 12 c. Here, too, the cutting edges 12 d are sharpened like a knife by inclined surfaces 12 e , so that they form a pair of scissors with a correspondingly inclined cutting edge 11 d , the angle of which opens in the direction of arrow B and thereby exerts a pull in the direction of arrow B on the material .

The knife edge 11 b, which is at most 0.5 mm in front of the tendon 12 &, is intended to score the material to be cut that is initially compressed when the cutting device is advanced. The elastic material to be cut arches into the gaps between the teeth of the knife and is cut there with the front parts of the cutting edges 11a * and 12d, which work together as scissors. Tooth width and tooth gap width are expediently the same.

When cutting with the cutting edges Hd and lld is due to their the knife back diverging towards the direction to which c in the cutouts 11 during pushing forward (opposite to the direction of the arrow B) of the blade 11 bulging, in Fig. 3 dash-dotted lines to be cut 15, a force component in Direction of arrow B exercised.

In the present case, the sheath leg 13 is also provided with exactly corresponding dovetail recesses 13 c , which are only indicated in FIG. 1.

On this side, however, these do not have the task of forming scissors together with the knife, but only the purpose, due to the unevenness of the outer surface of the sheath 13 to prevent the cutting material sliding along it, the up and down movements of the knife to participate. This purpose can of course also be differently designed cutouts or even only external ones Fulfill wells. For manufacturing reasons, however, it is advisable to use the same cut-outs as in the Schenkell2 to use the same pre-machined strip material for the production of a symmetrical To be able to use scabbard.

The cutting edge 13 b is only so far back behind the cutting edge 11 b that the facing side surface of the knife 11 going up and down is not exposed in order to prevent the cutting device from oscillating.

The gaps between the pieces 14 serve to remove any that has gotten into the bottom of the vagina Pieces of the food to be cut.

Claims (1)

PATENT CLAIM: Foam cutting machine, in which a knife is provided that goes up and down in the longitudinal direction and is guided in a sheath encompassing its back and side surfaces, the knife and at least the sheath leg facing the knife edge being provided with teeth consisting of teeth and tooth gaps and the tooth flanks of the knife and the scabbard are sharpened, characterized in that the tooth gaps have a shape widening towards the base of the gap and the teeth, as known per se, have an expediently straight cutting edge extending in the stroke direction. Considered publications:
German Patent No. 40,945;
Swiss patent specification No. 278 26 ™.
U.S. Patent No. 2671267. 1 sheet of drawings © 20 »629/249 7.62