DE617205C - Motorized hand shears - Google Patents

Description

In the case of hand shears, especially motorized hand shears, with straight Mn and moving knives and a product support, which essentially bucket aisle S corresponds to a coreless snail! the cutting edges of the upper and lower knives are each at a certain angle to the plane of the ^ table-shaped food to be cut. It has been found that for good maneuverability in curves When using hand scissors, this cutting angle must be as large as possible.

But the larger these angles, i. Il. the more pointed the scissor knives are chosen, the more the undesired occurs As a result, there are lockstitch-like markings along the cutting edge are.

According to the invention, the turning maneuverability of hand scissors of the aforementioned

ao type is increased by the fact that the sliding surface of the knife facing the counter knife and the edge formed by the knife back flute the knife in the immediate vicinity of the knife tip with a recess rounding off the edge is provided.

The new knife training is based on the knowledge that a pair of scissors is marked Type is the more necessary, the narrower with the greatest mesis coverage the.

Coverage area (measured in the direction of the cutting material prescnubsi). With the same size Knife overlap is -so 'the pair of knives with the larger snow angle in Be an advantage. With a large cutting angle, however, there is the disadvantage described above connected. Therefore, according to the invention, the width of the overlap area (in the measured direction in question) in a completely different way, namely vice versa their rear limitation (seen in the direction of the feed of the product) a recess on the through 'the knife back surface and facing the counter knife Mesa sliding surface formed knife edge, at least in the area of the largest Blade overlap, is brought closer to the cutting angle apex.

By applying the invention finally also achieved that the cutting angle of the knives are now granted so small can that the quilted search markings no longer appear and yet one Sufficient curve maneuverability when using the hand scissors.

The recessed point of that knife edge starts as close as possible to the tip of the knife, but on both knives a short stretch of the edge measured from the tip and should be smaller than the stroke of the moving knife. The measured in the direction of the edge The length of the recessed point is a multiple of the largest to be cut Cutting thickness.

An exemplary embodiment of the subject matter of the invention is shown schematically in the drawing shown.

Fig. Ι shows a scissor head with the new knives,

Fig. 2 is leash and back

Fig. 3 a. Side view of the Obermes'ser, by the

Fig. 4 shows a section along IV-IV (Fig. 2).
Fig. 5 is a back and

Fig. 6 is a side view of the bottom knife, this in

Fig. 7 is drawn in plan view. The images show upper and lower " ίο knives each in the position that they are in operation to each other '.

From Fig. Ι the arrangement of the knives on a Scheireinkopf 7 can be seen ', which is to be thought of as being attached to a handle motor (not shown). In the head 7, the knife ram 6, which is accessible at the cut-out point j ^{a of} the housing 7, slides up and down in the head 7, driven by a suitable gear mechanism. The upper knife .1 is screwed onto this plunger 6 with two screws 5. The lower knife 2 is fastened to the worm gear-shaped 'product support table 3 with screws 4. Figures 2 to 7 provide detailed information about the design of the knives themselves. The cutting edges are denoted by ΐ ^Λ or 2 *, the knife tips with i ^b or 2 ^Ö , the knife sliding surfaces with i ^c or 2 ^C , the knife back with i ^d or 2 ^d .

The knife edge j passing through the knife tip I ⁶ or i ^b, at which the surfaces i ^c and i ^d or z ^c and 2 ^d meet, points in the vicinity of the knife tip; a recess i ^e or 2 ^e . Between the knife tip and the - recessed edge section x ^e , 2 ^e . 'a short distance I ^ or zf of the sharp. Edge left. The recess is rounded and takes up one i ^b _x 2 ^{b with increasing distance from the knife tip}

increasing radius, which becomes smaller again at the upper knife 1 after exceeding a maximum amount. If, as is the case with the upper knife, the edge to be cut out is long enough, the recess i ^e , 2 ^e remains limited to 'a certain distance between sharp-edged' edge parts, which is expediently 4 to 10 times the amount of the largest the thickness of the product being cut. The length of the sharp-edged distance between the knife tip i ^b , 2 * and the recess i ^d , 2 ^d should expediently be smaller than the knife stroke.

Claims (3)

Patent claims: ι. Motor-operated hand shears with a knife moved in a straight line here and a cutting material support which essentially corresponds to a garig 'of a coreless screw, characterized in that the knife sliding surface (i ^c , 2 ^C ) facing the counter knife and the Knife back surface (i *, 2 ^d ) formed edge of the knife (1, 2) in the immediate vicinity of the knife tip (i ⁶ , '2 ύ): is provided with a recess (i ^e ; 2 ^e ) which ^{rounds off the edge.} 2. Hand shears according to claim I _3, characterized in that the entire length of the recess (i ^e ) on the upper knife (1) in the direction of the edge is approximately 4 to 10 times the greatest thickness of the material to be cut. 3. Hand scissors according to claim 1 and 2, • characterized in that the ge between the knife tip and the rounding. placed sharp-edged edge distance ( \ t, 2 /) on the upper and lower knife (τ, 2) is smaller than the stroke of the moving knife. For this iJ31att drawings. , *