EP1505182A1 - Cutting device for cutting double pile fabrics - Google Patents

Abstract

A textile cutting assembly separates a double pile weave as it is discharged from a loom. The cutting station is a rider (2) mounted knife (4) that slides along a rail (3) and is presented transverse to the warp. The blade is fabricated of hard metal, ceramic or compound material. The materials used in the blade are stable above 120C and embedded with supplementary particles that are carbides, nitrides, carbon-nitrides or pure carbon. The knife blade is located on a rider and may swivel (260) to a new presentation about a vertical axis. The blade cutting edge is beveled and describes an angle of 10 to 60.

Description

The invention relates to a cutting device for separating double-winged fabric on a double-file weaving machine, consisting of one across the Kettrichtung in the parting plane, along a guide rail movable Knife carriage and from a Messerschlitten positionable knife.

DE 31 04 970 C2 discloses the blade on a knife carriage to fix on a receiving part by means of cover plate and clamping screw. The clamping plate is on the knife carriage perpendicular to the direction of movement of Knife carriage against the cutting plane or against the direction of the Loom adjustable. The knife is used at every stroke or double stroke of the Knife carriage by means of a frame-mounted but yielding mounted grinding device sharpened. The repeated sharpening leads to often necessary Readjustment. The readjustment will be manual at machine shutdown at short intervals executed. In the usual use of the weaving machine are pro Layer up to two new knives needed.

DE 34 16 477 A1 proposes adjusting the receiving part automatically with the knife. For that purpose that is Receiving part guided in the knife carriage transversely to the direction of movement. The adjusting movement done by a spindle. A mother trained as a Maltese cross is, then, when a photocell, which monitors the knife, one given certain information, rotated by a fixed amount. With this automatic adjustment of the knife is only the degree of automation elevated. The regular replacement of the used blades after a short time is still required.

With EP 0 993 906 A1, a grinding element for the knife of the knife carriage proposed in the form of an abrasive belt. This band is flexible and the mass of the band is - relative to the section that the cutting edge of the knife must move during the grinding process by small amounts - low. By using such a belt, it is possible the grinding process even at higher working speeds of the weaving machine more sensitive perform. Less material is removed during the grinding process. The consumption of the knives is slightly reduced. At higher web speeds Knife temperatures are reached that are very close to Melting point of the synthetic pile yarns are. It form melt beads. Natural pile yarns such as wool and cotton start at these temperatures to char.

Another approach is taken by the disclosure in EP 1 122 348 A1. In this Document means are proposed which does not have the grinding process at each double knife stroke, but only in case of need. The knife carriage is based on existing experience or by a sensor generated Signal moves over a larger stroke when a grinding operation to be executed. In the same way, the readjustment of the Diameter. For this process, a position is provided, which is farther outside the grinding position is arranged. For adjusting the knife is the Clamp of the knife dissolved and the knife by means of spring against a pushed firmly fixed stop. This ensures that the knife during subsequent grinding process always a predetermined, exact position to the Grinding tool occupies and the bias of the grinding tool on Messer has a controllable size.

With this device and procedure, it is already possible, the service life The knife significantly increase and the cutting quality at speeds from 110rpm to 140rpm always under control. At higher speeds (from about 160 U / min), the temperatures settle at 160 ° C. Polypropylene fibers begin to form melt beads.

With the rising speeds of double-flop looms, especially for the field of application of carpet making, also increases the speed, with the knife at a designated grinding on the Grinding tool hits. This strong blow of the knife on the grinding tool causes the grinding tool not elastic and vibration-free can dodge. It leads in the area of the impact to an uncontrolled strong grinding process. Other areas of the knife edge are against it Less ground and further contribute to the increase in the blade temperature.

As the sensors for determining the cutting ability of the knife usually not sensitive enough work around the sharpness of a cutting edge in all effective To control areas, after a section above average abrasive grinding a large number of cutting strokes executed with a relatively blunt knife. This has a faulty pile surface result. The resulting high temperature of the knife can - like already mentioned - lead to melt pearls at the fiber ends. The quality of Carpets are reduced.

At warp knitting machines, it is in connection with the production of Florgeweben by the DD 116 642 and US 4,263,790 known that over Polplatinen tensioned pole loops one after the other by means of a rotating knife separate. The knives are made of a high polymer-filler mixture, wherein the filler is fine-grained (normal corundum) and abrasive. At the cutting edges The filler grains are quickly exposed and are able to To scratch fibers with their edges, so that they with increasing tension burst. The certainty that the ones making up the cutting edge are still relative do not loosen coarse grains from the knife, it was ensured with an enlargement the cutting angle to 30 ° to 45 °. To avoid a high Temperature at the cutting edge reduced the relative velocity between Knife and the fibers to be separated at about 1.5 m / s to 3 m / s. The Service life of the knives on the knitting machines was almost unlimited.

A transmission of this, the cutting-grinding-like cutting process The Doppelflorwebmaschine was therefore not because the fiber ends in such a separation process tuft-like split. The pile surface of the Carpets became dull and prone to picking up dust and dirt particles.

Another disadvantage was that the temperature of the knife carriage fixed blade - due to the lack of adequate cooling time - Increased. The tuft-like split fiber ends formed fine enamel pearls that have the negative effect of the matte finish and the increased dirt pick up even more.

The object of the present invention is therefore a cutting device which, over long periods of time, adds to the cutting ability of the knife ensures thermal protection of the fibers to be separated and also at very high speeds of loom the uncontrolled clash from grinding device and knife avoids.

Such a cutting device is defined by claim 1. The proposed Knife can through its material composition over maintain its cutting ability for a long period of time. It assures with his powdered filler particles a clean cut of all individual fibers.

The good thermal conductivity of this cutting material - it is at least twice as high as that of steel - and necessarily for this material increased blade thickness (heat dissipation takes place over a larger area) leads to a limited, superficial heating of the cutting edge (approx. 80 ° C to 90 ° C). The melting point of the most critical fibers, the polypropylene fibers, is between 163 ° C and 175 ° C. The formation of molten beads takes place therefore not held.

The knives are provided according to the invention with a plurality of cutting edges, by a position change of the knife on the knife carriage in succession can be used.

The service life of each cutting section can be determined by empirical values and has large tolerances, allowing a manual move of the Messer is sufficient and can be bought. The lifetimes a cutting portion lie when using said Cutting material regularly at several shifts or even weeks. at Hard metal knives have not been found to wear after months. During use, a high quality of the cutting process was consistently possible be guaranteed.

The shapes of the cutting sections according to claim 2 allow an optimization the cutting geometry for different pile yarns and pile densities.

The design of the cutting edge according to claim 3 allow in addition to a simplified Knife making also a permanent change of each activated Cutting in small steps or in a continuous motion. The latter also has the advantage of better cooling of the knife

The execution of the knife positioning according to claim 4 has the advantage of lower mass of the knife carriage. There are no drive elements needed the sled. In addition, the life of a cutting section without position change so long that with an occasional manual control a new cutting section with a few simple steps in the cutting position can be brought.

The embodiment of the knife positioning according to claims 5 to 9 is One should especially choose one, if one the temperature of the knife on as possible wants or needs to maintain a low level.

When using the cutting edge angle according to claim 10 ensures a clean smooth cut the fibers of the pile yarns and at the same time Optimum connection of the cutting edge forming the Fülistoffpartikel with the Knife body. The heat dissipation is increasing with larger knife thicknesses cheaper.

Fig. 1

eine perspektivische Gesamtansicht des Messerschlittens mit angehobener Spannplatte und gelöster Spannschraube,

Fig. 2

einen Querschnitt durch einen Messerschlitten mit verstellbarem Aufnahmeteil für das Messer,

Fig. 3

eine Darstellung analog zu Fig. 2, bei der das Messer zusammen mit einem Halteteil direkt an der Messerschlittenplatte befestigt ist,

Fig. 4 bis Fig. 7

einige Messervarianten, die auf unterschiedliche Weise nacheinander die Positionierung mehrerer Schneidenabschnitte des Messers in der aktuellen Schneidposition ermöglichen,

Fig. 8

eine leicht vergrößerte Darstellung der Messerpositionierung in der Ausführung nach Fig. 7,

Fig. 9 und Fig. 10

Beispiele für die unterschiedliche Gestaltung von Schneidenabschnitten eines Messers,

Figuren 11a, b, c

unterschiedliche Anordnungen einer Hartmetallschneide am Messer,

Fig. 12

eine Ansicht eines Messerschlittens mit rotierendem Messer,

Fig. 13

eine vergrößerte Schnittdarstellung der Messerlagerung am Messerschlitten gemäß Fig. 12,

Fig. 14

eine Ansicht analog Fig. 12 mit einem Klinkenantrieb und

Fig. 15

eine Draufsicht zu Fig. 14 im Bereich des Klinkengetriebes:

The invention will be explained in more detail below using an exemplary embodiment. In the accompanying drawings show:

Fig. 1

an overall perspective view of the blade carriage with raised clamping plate and dissolved clamping screw,

Fig. 2

a cross section through a knife carriage with adjustable receiving part for the knife,

Fig. 3

a representation analogous to FIG. 2, in which the knife is fastened together with a holding part directly on the knife carriage plate,

Fig. 4 to Fig. 7

some knife variants which enable the positioning of several cutting sections of the knife in the current cutting position in succession in different ways,

Fig. 8

a slightly enlarged view of the knife positioning in the embodiment of FIG. 7,

FIGS. 9 and 10

Examples of the different design of cutting sections of a knife,

FIGS. 11a, b, c

different arrangements of a carbide cutting edge on the knife,

Fig. 12

a view of a knife carriage with a rotating knife,

Fig. 13

an enlarged sectional view of the blade bearing on the knife carriage of FIG. 12,

Fig. 14

a view similar to FIG. 12 with a jack drive and

Fig. 15

a plan view of Fig. 14 in the region of the jack gear:

The cutting device according to the invention is based on a knife carriage for a double carpet weaving machine.

The knife carriage 2 is by means of toothed belt 5 transversely to the direction of the Weaving machine in regularly changing directions moved back and forth. He slides with its guides 21 on the indicated in Fig. 2 guide rail 3. The timing belt 5 receives its drive movement from a controlled Servomotor. The knife carriage 2 is detachable with a coupling 22 with the Timing belt 5 connected.

At the bottom of the carriage plate 20 may in the central region a receiving part 23 may be arranged, which carries the knife 4. This receiving part 23 becomes on the carriage plate 20 transversely to the direction of movement of the knife carriage 2 positively guided and is by means of screw 231 on the carriage plate 20 fixed after it is exactly to the correct cutting position of the Knife 4 has been set.

At the top of the free end of the receiving part 23 is a peg-shaped positioning element 232, which in the present case, an approximately Hexagonal basic shape, whose transitions are designed arcuate. Within this positioning element 232 is a threaded hole, in the clamping screw 25, which the clamping plate 251 on the Knife presses, is screwed. The knife 4 shown in Fig. 1 has a circular shape (401) in the cutting area. In the center of the knife 4 is a Fixing opening 41 is provided, the form-fitting manner on the hexagonal positioning 232 is plugged. Between the fixing hole 41 and the circumference of the positioning element 232 can be insignificant in a positive connection Be provided in the area a free space in the means for lifting the Messers can be introduced.

On the knife 4 can in the individual angle ranges, each one Cutting area 401 are assigned, applied numerals or other characters be that mark the respective angular position.

The regular construction of the positioning element 232 allows that The knife can be plugged in six different positions can, so that six different cutting sections 401 successively can be used regulated.

The knife is made of a hard metal material at least in the cutting area or a ceramic material which as a filler very fine, powdery and has hard particles. It is also possible to cut the area of the Knife 4 from a so-called. Particle composite produce. Important is, that the filler particles have sufficient hardness and are so small that the cutting edge of the knife 4 are formed very sharp can. The best results were obtained with filler particles of carbides, nitrides, Carbonitrides or made of pure carbon. The binder used metallic or synthetic type should be at the adjusting cutting temperature the particles of the filler even in the narrow cutting area still be sure to stick to the composite.

At an adjusting cutting temperature of about 90 ° C you should a reliable stability of the binder at least 120 ° C, preferably however, ensure from 150 ° C. It is favorable, if the stability also still can be guaranteed at higher temperatures. That's the regular one Case, when metals are used as binders.

The particles of the fillers in the cutting area become immediately after beginning of use freed from binder by the passing fibers and act with its hard and angular surface directly on the to be separated Fibers of the presented pile layer.

The cutting angle γ must be in contrast to that of the steel knife be chosen significantly larger. The particles involved in the cutting process of the Filler must be reliable in a wider range of angles by means of binder and be held securely on the knife body.

In Fig. 2, the knife carriage shown in Fig. 1 is again as a section in a slightly modified structure shown. Here is the receiving part 23 in his Connecting portion is bent upwards and is with its attachment portion guided on the top of the carriage plate 20 and by means of screws 231 strained.

The positioning element 232 is located at the front end of the receiving part 23 and protrudes from below into the fixing opening 41 of the knife 4 used. A clamping screw 25 presses the clamping plate 251 on the knife. 4

With the adjustable receiving part 23, the exact cutting position of Knife tip set between the guided double pile fabric 1. These Position is of great importance because at the point where the knife 4 with its tip touches the fibers, through the two pile fabric 11, 12 a particular train is exerted on the fibers, which supports the separation process.

The easiest way to determine the position is in the machine itself and then for a long period by the fixing screws 231 fix. It is of course also possible this position through adjustable guide plates of the To define knife carriage 2. However, such an attitude is regular much more complicated to handle.

A similar to Fig. 2 design of the blade carriage 2 'is shown in Fig. 3. Here is a subsequent adjustment of the cutting position of the knife. 4 dispensed with the knife carriage 2. The knife 4 is here directly with the Carriage plate 20 'braced.

In FIGS. 4 to 7 are knives 4 with different shapes of the positioning elements and corresponding shapes of the fixing hole 41 of the Knife 4 shown.

Fig. 4 shows a circular blade 4, the six cutting portions 401 with a constant Radius R owns. The cutting portions 401 are zueinender order an angle α offset by 60 °. The positioning element 232 and the Fixing 41 have - as already described in Fig. 1 - each a hexagonal Basic shape, with the transitions between the outer / inner faces arcuate designed. Reduce these arcuate transitions the notch effects in the relatively brittle knife body.

In Fig. 5, a knife is shown, which has a predominantly annular fixing opening 415 with a nose 4151 has. The positioning element 242 consists of six annular centering pins. The nose 4151 is between each two adjacent centering pins form fit insertable, so that the knife 4 in six different positions a, b, c, d, e, f used and can be fixed.

This reliably ensures that the effective cutting sections 401 do not overlap after a changeover and already used cutting edge areas to be used again, it is u. U. appropriate, a Separation angle 404 between two Schneidabschn ity 401 provided.

Another embodiment is shown in FIG. 6. This knife 4 has three cutting sections 401 ', each extending over about 110 °. The locking angle α here is 120 °. The separation angle 404 is selected to be about 10 °. The positioning elements 232 'and the fixing hole 416 have approximately the same triangular shape and are form-fitting ineinanderfügbar.

Another variant that allows the knife 4 in different angular positions to fix, Fig. 7. The carriage plate 20 or the receiving part 23 have in the clamping range of the blade 4 at corresponding angular intervals (Angle α) notches 243. In these notches 243, a single am Knife 4 shaped wedge 4171, located at one end of the knife 4 (see Fig. 8) are introduced. The reliable radial guidance of the Knife 4 can in this embodiment by a cylindrical shaft 250 of the Clamping screw 25 are ensured (see also Fig. 8).

FIGS. 1 to 7 show knives arranged in a circle Have cutting sections with a radius r = R. The radius R corresponds the radius of the knife 4.

However, experience shows that it may be useful to determine the geometry of the Cutting within a cutting area to optimize. Two of these possible Blade shapes are shown in FIGS. 9 and 10.

The cutting portions 402 are in Fig. 9 between the locking angles α convex arched. The effective radius r is significantly smaller than the radius R of the average cutting circular path R. The cutting portions 402 are each formed symmetrically to a radial axis of symmetry S, so that in both directions of movement of the blade carriage 2 coinciding Cutting conditions are effective.

In Fig. 10, a prismatic cutting configuration of the cutting portions 403 in the area of the cutting circle path (radius R) is preferred. The cutting sections 403 are obtuse, wherein in the working position the Symmetry axis S and thus the tip of the cutting portion 403 am widest protrudes into the tissue 1.

Figures 11a, 11b, 11c show different shapes for positioning the cutting part made of hard metal, ceramic or a particle composite material in the cutting area.

In Fig. 11a, the knife 4 consists exclusively of a cutting part 43, the Z. B. consists of hard metal.

In Fig. 11b is a so-called. Fixierring 42 in the center of the blade 4 from a metallic material or the like. Provided. This metallic material forms the profile of the fixing hole 41. In the outer cutting area is by a Pressing operation in the form of an annular cutting part 431, the hard metal attached, which eventually forms the tip of the cutting edge 40.

In the embodiment according to FIG. 11c, the complete knife body 421 consists of a metallic material. The cutting edge forming carbide or Like. Forms only a cutting part 432 in the form of a coating.

Another modified embodiment of a blade carriage 2 "is shown in FIG. 12 is shown. The mounting of the blade 4 'is shown in Fig. 13 as enlarged To see sectional view.

The knife carriage 2 "moves in the usual way on the guide rail 3 parallel to the dividing edge of the double pile fabric 1. Instead of the positioning element 232 in the region of the pivot axis 260 is on the carriage plate 20 an upwardly directed pin 26 by means of welding or adhesive connection attached. The knife 4 'is substantially similar to that described in Fig. 11b Ranges held in a fixing ring 42 ', so that on the hard metal material of the knife, which is relatively brittle, no bending or compressive stresses be exercised. The fixing ring 42 'is on a sleeve-shaped knife guide Attached 7, which has a collar at its lower free end. At the opposite end has this knife guide 7 a thread. On this thread is a toothed belt pulley 71 screwed, which is the knife 4 'axially clamped on the knife guide 7.

A trained at the upper end central cam is of an elastic Part of the blade carriage 2 ", a so-called retaining spring 27 against the clamping point of the pin 26 is pressed. A vertical movement of the knife 4 'is thereby prevented.

On the knife carriage 2 "is in the rear of a stepper or servo motor 6 arranged, the not shown contact rails in the region of the guide rail 3 is powered and from a central control device according to a given program corresponding drive movements receives and executes.

Its drive movements are on its axis 60 via its toothed belt pulley 73, the toothed belt 72 and the toothed belt pulley 71 on the knife guide 7 transmitted to the knife 4 or 4 '.

The stepper motor 6 can be a continuous rotary motion with very low Run speed so that the tip of the blade 4 'and the cutting edges 401 on the circumference of the knife constantly their position to the tissue change. Heated cutting edges of the knife 4 'are permanently off moved out of the fabric and exposed to a cooling airflow while cooled cutting sections return to the cutting position.

To ensure a consistently uniform cutting characteristics, it is in this Case expedient, the direction of rotation of the blade 4 'of the direction of movement of the Knife carriage 2 "adapt, so that the relative speed of the knife edge always the same, absolute and opposite to the fibers to be separated has relative size.

Of course, it is also possible with the stepper motor 6, a different kind of knife movement to realize. So it may be useful, the cutting edge sections 401 at regular intervals, z. B. after one or ten Knife strokes to change in the area outside the tissue 1.

It is possible the size of the adjustment steps of the blade 4 'more or less to choose differently at random. The sudden impact of fibers at a larger acute angle to the knife edge, which to a larger or faster dissolution of individual particles at the Cutting edge leads to larger areas of the knife edge on Scope of the knife distributed.

Another form of knife adjustment is shown in FIGS. 14 and 15. Here is the indexing of the knife 4 or 4 'a jack drive. The on one axis 60 of the blade carriage 2 "'freely movable latch lever 65th has at its free end an enlarged mass 653 and one by one Spring 652 held pawl 651. The pawl 651 is used to advance the Ratchet wheel 66. The pawl lever 65 is between two with damping pad provided stops 28, 28 'on the carriage plate 20 (23) under the action the acceleration forces acting in changing directions on the mass 653 of the ratchet lever 65 in the carriage reversal movable so that he in an end position the ratchet 66 progresses and in the other end position in his starting position returns. The ratchet 66 is torsionally rigid with the Drive gear 73 of the toothed belt 72 connected and rotates about the pulley 71 continues the knife 4 or 4 'by an amount so that after each Double stroke of knife carriage 2 "'a new area of the blade of the knife 4 'reaches the cutting position.

By the retaining spring 27, the knife 4 'with its knife guide 7 on the Guide surface of the carriage plate 20 or the receiving part 23 is pressed and thus largely securely fixed during the carriage stroke.

In addition to the inertia of the ratchet lever 65 can be used to advance the ratchet wheel 66 also use other known mechanisms. Such Mechanisms could be magnets that affect the path of the knife carriage. It is also possible frame-fixed slide guides for one arm of the ratchet lever in the turning area of the knife carriage 2 "'.

With this type of intermittent progression of the knife 4 'can be achieved on the one hand, that the knife edge only briefly in the heated Cutting position is located, so that the temperature of the knife edge on a low level. On the other hand, there are always new ones Cutting edges spent in the cutting position. The total lifespan this knife 4 'becomes very tall or practically unlimited.

The knife edge of carbide knives is outside the machine when needed nachschleifbar, so that after prolonged use new particles in the Activate cutting material. Has proven to be the radial movement of the Grinding tools in the area of cutting.

LIST OF REFERENCE NUMBERS

1

double-pile

11, 12

pile fabric

2,

Knife cuts (general)

2 ', 2 ", 2"'

blade slide

20, 20 '

carriage plate

21

guide elements

22

clutch

23

receiving part

231

Screw connection (adjustable)

232, 232 '

Positioning element (to receiving part)

24

Positioning element (on slide plate)

241

hexagon

242

Zapf group

243

locking grooves

25

clamping screw

250

- shaft

251, 251 '

chipboard

26

spigot

260

axis

27

retaining spring

28, 28 '

attack

3

guide rail

4

Knives (general)

4 '

Knife (carbide cutting edge used in fixing ring)

4 '

Knife (harmetallbeschichtet)

40

Cutting edge (general)

401

Cutting section, part of the circular shape

402

Cutting section, curved (r <R)

403

Cutting section, prismatic

404

separating region

41

Fixing opening (general)

414

- hexagon

415

- Drilling

4151

- - Nose

417

- Drilling

4171

- - Nose

42, 42 '

fixing

421

Fixing ring as a knife body

43

cutting part

431

Cutting part, connected with fixing ring

432

Cutting edge, applied to body

5

toothed belt

6

Stepper motor / servomotor

60

axis

65

ratchet lever

651

pawl

652

feather

653

Dimensions

66

ratchet

7

knife guide

71

Timing pulley

72

toothed belt

73

Timing pulley

a, b, c, d, e

f angular positions (general)

a6, b6, c6

Angular positions (Fig. 6)

R

Radius of the cutting circle path

S

axes of symmetry

r

Radius of a cutting section

α

Locking angle / angle (distance between two angular positions)

γ

cutting angle

Claims (10)

Cutting device for separating double pile fabric on a double pile loom, consisting
from a transverse to the warp direction in the parting plane, along a guide rail (3) movable blade carriage (2) and
of a knife (4) which can be positioned on the knife carriage (2) and which at least in the area of the cutting edges (40)
made of tungsten carbide or
from a ceramic material or
made of a particle composite material
with in a, at a temperature of over 150 ° C stable material embedded filler particles
carbides, nitrides, carbonitrides or
is made of pure carbon,
the knife (4)
on the knife carriage (2) is mounted adjustably about a vertical pivot axis (260),
is provided at its periphery with a plurality of radial symmetry axes (S) symmetrical cutting portions (401, 402, 403) which are arranged at the same distance from the pivot axis (260), and
with cutting angle In (γ) between 10 ° and 60 °. Cutting device according to claim 1, characterized in that the cutting portions (402, 403) to the respective axis of symmetry (S) are convex arcuate or obtuse. Cutting device according to claim 1, characterized in that the arcuate cutting sections (402) of the blade (4) are combined to form a circular cutting edge (401) of uniform radius (r = R). Cutting device according to claim 1, characterized in that the knife (4) on the knife carriage (2) positioning elements (232; 232 '; groups of pins 242; notches 243) are assigned according to the spline principle such that optionally each of the cutting portions 402, 403) in the Positionable cutting position and with the knife carriage (2) or the receiving part (23) is clamped. Cutting device according to claim 1, characterized in that the knife (4) on the knife carriage (2) for forming the pivot axis (260) is associated with a vertical pin (26) and
in that means (for example servo or stepper motor 6, pawl drive 65, 66) for adjusting the blade (4) are provided on the knife carriage (2 ") for activating another cutting section (401, 402, 403). Cutting device according to claim 1, characterized in that for the drive of the knife (4) a pawl drive (65, 66) is provided, the drive energy of which is derived from the movement of the knife carriage (2). Cutting device according to claim 1, characterized in that for the controlled drive of the blade (4) an electromechanical actuator (eg stepping motor 6) is provided on the blade carriage (2) and
in that the continuous or intermittent rotary drive movement is transmitted by means of a toothed belt (72) to the blade (4) movable about the pin (26). Cutting device according to claim 1 and one of claims 5 or 6,
characterized in that the drive (servomotor 6 or pawl drive) of the blade (4) are associated with means for its program activation. Cutting device according to claim 1, 3 and 7, characterized in that the stepping motor (6) are associated with means for controlling a nearly continuous rotational movement and means for controlling the direction reversal depending on the change of direction of the knife carriage. Cutting device according to claim 1, characterized in that the cutting angle (γ) between 20 ° and 35 ° is selected.

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