US3831473A - Device for cutting endless material, for example for the production of staples from synthetic fibers - Google Patents

Device for cutting endless material, for example for the production of staples from synthetic fibers Download PDF

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Publication number
US3831473A
US3831473A US24665972A US3831473A US 3831473 A US3831473 A US 3831473A US 24665972 A US24665972 A US 24665972A US 3831473 A US3831473 A US 3831473A
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United States
Prior art keywords
cutting
drum
fibrous material
blade
shell
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English (en)
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H Fleissner
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Vepa AG
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Vepa AG
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Publication date
Priority claimed from DE19712119821 external-priority patent/DE2119821C3/de
Priority claimed from DE19712159485 external-priority patent/DE2159485A1/de
Priority claimed from DE19722206255 external-priority patent/DE2206255A1/de
Application filed by Vepa AG filed Critical Vepa AG
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Publication of US3831473A publication Critical patent/US3831473A/en
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    • D—TEXTILES; PAPER
    • D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
    • D01G—PRELIMINARY TREATMENT OF FIBRES, e.g. FOR SPINNING
    • D01G1/00—Severing continuous filaments or long fibres, e.g. stapling
    • D01G1/02—Severing continuous filaments or long fibres, e.g. stapling to form staple fibres not delivered in strand form
    • D01G1/04—Severing continuous filaments or long fibres, e.g. stapling to form staple fibres not delivered in strand form by cutting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S83/00—Cutting
    • Y10S83/913—Filament to staple fiber cutting
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/202—With product handling means
    • Y10T83/2066—By fluid current
    • Y10T83/207—By suction means
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/465—Cutting motion of tool has component in direction of moving work
    • Y10T83/4734—Flying support or guide for work
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/485—Cutter with timed stroke relative to moving work
    • Y10T83/494—Uniform periodic tool actuation
    • Y10T83/501—With plural tools on a single tool support
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/647—With means to convey work relative to tool station
    • Y10T83/654—With work-constraining means on work conveyor [i.e., "work-carrier"]
    • Y10T83/6545—With means to guide work-carrier in nonrectilinear path
    • Y10T83/6547—About axis fixed relative to tool station
    • Y10T83/6548—Infeed
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/647—With means to convey work relative to tool station
    • Y10T83/6579—With means to press work to work-carrier

Definitions

  • ABSTRACT A device for cutting endless fibrous material, particularly for the production of staples from synthetic fibers, which comprises a rotatably disposed support means feeding the fibrous material to a cutting zone, said support means being operatively associated with a rotatably mounted cutting means and comprising drum means subjected to a suction draft.
  • each blade is propelled transversely through a cable held between gear wheels, or the cable travels along the periphery of a rubber roll, against which a knife roller rotates; radially projecting knife blades of this knife roller beat against the. cable and separate the cable under pressure.
  • the tool life of the knives in particular, are short; furthermore, the staple lengths obtained are nonuniform.
  • the crushing of the fibers is a more advantageous method for producing simple fibers.
  • the cable is wound up spirally on a knife cage. From the outside, a solely pressure-producing roll contacts the wound-up cable package at a constant spacing with respect to the axis of the knife cage.
  • the pressure between the roll and the radially aligned knife blades of the knife cage will reach a strength sufficient to separate the fiber layers pressed directly against the blades of the cage.
  • the service life of the blades is considerably longer, because the fibers do not come into contact with the counter roll.
  • this separating method is undersirable, because very high pressures are required in order to obtain the cutting of the fibers, which pressures impair the blade.
  • a further problem which in certain cases is even more complicated, resides in holding the cable during the cutting operation. It is conventional to hold the cable by means of the teeth of two opposed gear wheels. It is also possible to retain the cable on a counter roll during the cutting operation by means of a contact roll rotating approximately coaxially with the knife cage. However, none of these possibilities as yet represents a desirable and final solution. Consequently, this invention is furthermore directed to means for holding the cable during a cutting operation which exerts a maximum amount of friction.
  • This sievedrum means canhave ashell which is perforated or otherwise suitablyaconstructed to be air-permeable.
  • the suction draft generated within thedrum by a fan arranged, for example, at the front'face the long, but still very thin cable will flatly contact the sieve drum shell and will be firmly retained thereon, so. that a bladeican be guided without difficulties through the fixedly held cable.
  • This blade as further required by this invention, to be guided relatively to the cable at a highspee'd, if possible.
  • the axes of the sieve drum and of a rotatable cutting blade, disposed at a spaced distance from each other, are suitably arranged perpendicular with respect to each other, whereby a transverse cut is also made possible'by means of a frictional movement.
  • a suitable embodiment of the cutting means consists in fashioning this means as a rotating disk provided with one or more blades along its outer circumference.
  • These blades which. can be constructed to be straight or curved in a convex manner, can'be endless (i.e..continuous) or can also be provided with interruptions.
  • there isthepossibility of constructing the cutting means as. a worm wheel with one preferably in a rotatable manner, optionally even. in a driven manner.
  • Another possibility resides in aligning the blades, formed, for example, of exchangeable razor blades or the like, in an inclined manner under an angle with respect to the tangent at the mounting point of this blade at the cutting means, so that each blade of. the cutting means executes a cut through the cable for the production of the individual staples.
  • the cable which is held in a spread-out condition fixedly on the sieve drum, is thus cut in the desired staple length by means of a blade guided through the cable at ahigh speed.
  • the .angle of the groovesobliquely to the drum axis depends on the speed ratio of the peripheral speed of the drum and the rotational speed of thecuttingdevice. These speeds vmust be extremely accurately adapted to each other, so that the blade .underno circumstances comes into contact with the outer surface of the drum.
  • the grooves in the drum shell can be milled into a finished drum.
  • it can evenbe advantageous to fashion the sieve drum shell to beconcave, so that the groove is of the same depth at-all'points over the width of the shell.
  • it is alsopossible to-manufacture the sieve drum shell of sheet metal strips, which strips are attached at the end walls at a minor spacing from one another for the formation of the grooves.
  • the minimum staple length is always determined by the spacing from one groove to the next on the drum periphery.
  • the maximum staple length is independent of the number of grooves, since this length is also dependent on the rotational speed of the cutting means; it is possible, for example, to omit one or two of the grooves in the successively conducted cutting steps.
  • the staple length can be determined, without exchanging the cutting means and also without exchanging the sieve drum, solely by the velocities of the two rotating parts with respect to each other.
  • the fibers are suitably removed from the sieve drum by an air stream and are conveyed to the subsequent treatment unit.
  • the air stream produced by the fan it is advantageously possible to utilize the air stream produced by the fan to provide the suction draft within the sieve drum.
  • this air stream can also serve for detaching the staple fibers from the sieve drum, by conducting a portion of the conveyed air from the outside against the perforations into the zone of the inner covering or baffle serving for preventing the suction draft along the portion of the shell which is not covered by the cable.
  • This stream is then again blown, from the interior of the sieve drum, to the outside of the drum at the level of the point or zone where the staple fiber is detached from the sieve drum, (after the suction draft has been interrupted by the covering).
  • the air conducted against the fibers at this point can then also serve simultaneously for the further conveying of the fibers.
  • a prerequisite for obtaining such a satisfactory cutting result is that all fibers are fixedly held at least at the cutting point or zone. Difficulties have been encountered in obtaining this objective in the device.
  • the fibers can be blown about on the drum by the draft of air coming from the direction of the cutting means. Besides, air eddies can form in the zoneof the cutting point, affecting the upper layers of the material transported on the drum.
  • Such means can be of a varying nature.
  • the means can consist of a spring or the like pressing from the outside against the fibrous material and thus against the drum; in this connection, the free end of the spring or the like should extend directly up to the cutting point.
  • Another possibility for solving the problem by the aforementioned means resides in the advantageous utilization of a suction unit removing the cut fibers. This suction unit is provided, according to this embodiment, at the half of the sieve drum not covered by the fibrous material, across from the cutting means.
  • the cover in this invention is to be extended up to the level of the cutting point, and a suction nozzle is to be disposed directly on the other side of the rotating cutting device.
  • the cable or tow disposed on the sieve drum in a more or less loose condition is tightly tensioned at the cutting point so that the cutting operation, on the one hand, can be carried out across the entire width of the two immediately upon contact of the cutting blade with the fiber, without there being the possibility that individual fibers move together with the blade by the pressure exerted by the blade; and on the other hand, even in case of texturized material, the resultant lengths of the staple fibers are always constant. It has even proved to be advantageous to shield the cutting slot proper against the suction draft by means of the inner cover; this holds true especially in case of short staple fibers, since these would otherwise be conveyed into the sieve drum through the cutting gap or groove.
  • circular cutting leaves or plates have proven to be advantageous, especially in case these are rotatably mounted, thus making it possible to utilize during the course of the cutting operation the entire circular periphery of the leaves for cutting, until the leaves have become blunt and must be exchanged for new ones.
  • This servicing of the machine makes itnecessary to leave the entire fiber producing a line at a standstill for a relatively long period of time; this should occur only at rare intervals, since it means a loss in productivity.
  • the whetting device or sharpening means of this invention will grind the cutting plates along the periphery consequently, the cutting leaves will always exhibit a uniform sharpness until the leaves have been ground down and have become too small for any further cutting steps. However, each leaf will still exhibit its original sharp cutting edge.
  • the sharpening device can be mounted fixedly to the cutting device or movably with respect to the rotating cutting disk.
  • the rotation of the cutting plates can be effected by the aforementioned friction between the plates and the cable, i.e. automatically, or also by means of a separate drive.
  • the surface of the sharpening device can be intermittent or can also be fashioned as a grinding disk. Furthermore, the grinding surface can engage the blade of the cutting plates only on one side-but also on both sides.
  • FIG. 1 is a sectional view of the cutting device of the invention with a fan housing disposed behind a sieve drum, in anelevational illustration;
  • FIG. 2 is a section through the device of FIG. 1, taken along line II-II;
  • FIG. 3 is a top view of the sieve drum shown in FIG. 1 on an enlarged scale
  • FIG. 4 is a cross section of one embodiment of the outer shell; of the sieve drum arrangement on an enlarged scale;
  • FIG. 5 is a cross section of another embodiment of the outer shell of the sieve drum arrangement on an en larged scale
  • FIG. 6 shows an embodiment of cutting disks of the device on an enlarged scale
  • FIG. 7 shows another embodiment of the cutting disks of the device on an enlarged scale
  • FIG. 8 shows still another embodiment of the cutting disk
  • FIG. 9 shows yet another embodiment of the cutting disk
  • FIG. 10 shows a sectional view of a cutting device similar to that of FIG. 1;
  • FIG. 11 is a top view of the sieve drum shown in FIG. 10 on an enlarged scale
  • FIG. 12 is a section through the drum shown in FIG. 10 in the zone of the cutting point on an enlarged scale
  • FIG. 13 is a section through a synthetic fiber tow cutting device identical to that of FIG. 10;
  • FIG. 14 shows the detail of the cutting device encircled in FIG. 13, on an enlarged scale
  • FIG. 15 is an elevational view of the cutting disk with a cutting leaf or plate in an enlarged representation
  • FIG. 16 is a section through the cutting disk according to FIG. 15, taken along line XVI-XVI;
  • FIG. 17 is a section through the cutting disk according to FIG. 15, taken along line XVII-XVII.
  • the device for cutting a cable of synthetic fibers, denoted by 1, into staple fibers 2 comprises essentially a sieve drum 3, rotatably mounted on one side in a stand 4 in a driven manner.
  • a fan 5 is likewise rotatably mounted and driven in the center of a stand 6. The fan places the interior of the sieve drum 3 under a suction draft and conveys the air sucked in through the perforations on the peripheral surface of the sieve drum shell 3' via a spirally arranged fan housing 7 into a duct 8.
  • the duct also serves simultaneously to effect transportation of the staple fibers to or in the direction of the machine disosed after the cutting device.
  • a cutting disk denoted by reference numeral 9, is arranged at right angles to the axis of the sieve drum 3;
  • the cutting disk 9 is advantageously aligned horizontally, so that the thusproduced staple fibers 2 are discharged from the cutting device solely by their own weight.
  • the cutting disk 9 is likewise rotatably mounted in a housing and is driven at a high rate of speed.
  • the function of the devices illustrated in FIGS. 1 and 2 is quite simple and clear.
  • the endless cable 1 of synthetic fibers which is conducted to the sieve drum via a spreading device 10 by means of a guide roller 11, is
  • the air taken in by the fan 5 through the shell 3 of the sieve drum is not only utilized for retaining the cable 1, but also for the discharge of the cut staple fibers 2.
  • the spiral housing 7 is extended, at its outlet duct-8, into the region where the staple fibers 2 drop from the cutting zone.
  • the exhaust air of the fan 5 is additionally conducted into the space between the cover 12 and the sieve drum outer surface, with the aid of a baffle 16, in order to blow any staple fibers adhering to the sieve drum away from the shell surface by an air stream (shown by arrows). This air stream then likewise serves for the further transporting of the staple fibers 2.
  • the sieve drum 3 is provided with grooves 13 on its perforated drum shell 3'; the blade of the cutting disk 9, during its movement transversely through the cable 1, penetrates into these grooves with its edge. In this way, the blade does not come into contact with the surface of the sieve drum; this has a particularly advantageous affect on the service life of the blade.
  • the grooves 13 in the sieve drum surface must be aligned obliquely with respect to the axis of the sieve drum, because the sieve drum continues its rotation during the cutting step. The extent of this obliqueness depends on the relationship between the speeds of rotation of the cutting disk 9 and the sieve drum 3.
  • the velocities must be accurately adapted to each other, so that during each revolution of the drum the cutting attached to the disk 9 exactly enters into the individual grooves.
  • the spacing of the individual grooves 13 in the sieve drum shell 3' depends on the required staple lengthS.
  • the minimum staple length is determined by the distance of the iridividual grooves from one another; whereas the maximum staple length depends merely on the ratio of the rotational speeds.
  • FIGS. 4 and 5 show two differently constructed sieve drums 3; the drum of FIG. 4 has a shell surface aligned in parallel to the drum axis; whereas the shell surface according to FIG. 5 is curved in a concave manner.
  • This concave configuration of the sieve drum shell surface makes it possible to offer an always uniform depth of penetration into the groove 13 for the path of movement of the blade, illustrated in dot-dash lines.
  • the groove 13 can be milled into the shell surface or-as shown in FIG. 4the groove can be formed by a gap between strips forming the shell of the sieve drum.
  • the cutting disk 9, illustrated only schematically in FIG. 1, is shown in greater detail in FIGS. 6 through 9 with different embodiments.
  • the blade can be fashioned as an endless (i.e. continuous) or as an intermittent knife. In case of an endless blade, this blade must form either a spiral or helical curve. In case of a spiral shape, as shown in FIG. 8, the blade extends in a plane, whereas, in case of a helical extension of the blade, as shown in FIG. 9, a type of worm wheel is required for the production of the staples.
  • the blades according to FIGS. 6 and 7 are formed by cutting elements or means individually attached to the disk. According to FIG. 6, these elements can be, for example, razor blades 14; whereas according to FIG. 7 additional cutting disks 15 are provided which are mounted in the support disk 9 in a rotatable and optionally also in a driven manner.
  • the portion of the disks 15 which comes into contact with the cable to be cut changes automatically with each cutting step, so that the small disks 15 are worn off uniformly along their circumference.
  • the curvature along the blade necessary to effect an easier cutting operation, is provided by the configuration of the cutting disks 15, whereas this feature is obtained in case of the elements 14 only due to their oblique positioning in the support disk 9.
  • the cutting device or apparatus according to FIG. 10 is similar to that of FIG. 1.
  • the cable 1, fed from a different direction, is cleanly cut through on the drum 3 by the rotating disk, shown in dot-dash lines.
  • the drum instead of being a sieve drum with slots 13, can also consist of a slotted drum 3 according to FIG. 1].
  • the inner cover l2otherwise, an outer cover 12' is providedreaches directly to the cutting point. In this way, the cable transported by the drum 3 is no longer held at the cutting point on both sides by the suction draft ambient within the drum.
  • the drum 3 is effective as a conveying element with its suction draft only above the cutting point.
  • a duct 17 is disposed below, the suction opening of which extends up to directly beneath the cutting point and has a sealing action with respect to the surface of the drum 3', on the other end of this duct, a fan 18 is provided for the production of a strong suction draft.
  • the suction draft of fan 18 the free end 1 of the crimped tow l is sucked into the suction opening of the duct 17 and tightly stretched at the cutting point against the holding force of the drum 3. This makes it possible to cleanly cut also texturized material without any difficulties by the rotating blades of the cutting device 9.
  • the holding device 19 serves as a further auxiliary measure for the prevention of a blowing about of fiber layers or the blowing away of fibers not in direct contact with the drum 3 and thus not retained by the suction draft within the drum; this holding device is fashioned as a resilient plate and presses, under tension, against the cable 1 held by the suction draft onto the drum 3.
  • the free end of the spring 19 is disposed directly above the blades, so that the cable conveyed by the drum 3 is retained on both sides of the cutting point. It is now no longer possible for the fibers to be shifted in the direction of the rotating knives, and no eddies of air can become effective, for example, by the rotation of the cutting blades; such eddies are substantially prevented by the unit 20 encompassing the cutting device.
  • FIG. 13 The device of FIG. 13 is similar to that of FIG. 10. The detail encircled in this figure will be described and explained hereinbelow.
  • the cutting blades are formed by cutting plates or leaves 15, disposed at regular intervals along the periphery of the cutting disk 9 and being rotatably mounted about a pin 21.
  • they are held between two bearing disks 22 of bearing metal.
  • the metal can be self-lubricating, but it is also possible to provide the bearing disks with lubricating points oriented toward the cutting plate 15.
  • the cutting plate 15 When the cutting plate 15 cuts through the tow lying on the sieve drum 3, the cutting plate 15, due to the thus-occurring friction between the tow I and the blade, will rotate about the pin 21even if only by a few millimetersso that, at the subsequent cutting step, the plate 15 contacts the tow with a different cutting edge.
  • the rotation of the plate can also be effected in a controlled fashion by special means so that, upon each cutting step, the plate is rotated by a specific amount.
  • a motor can be provided.
  • each cutting plate 15 is associated with sharpening devices which sharpen the plate either unilaterally or bilaterally along the edge during the operation of the cable cutting device.
  • the sharpening devices can be of varying types.
  • grinding lamellae 25 are attached to the device 20 surrounding the cutting disk 9. This device 20 serves for the prevention of air currents which could unduly shift or lift the cable disposed on the sieve druin 3.
  • the sharpening lamellae 25 are aligned obliquely with respect to the alignment of the cutting plates or leaves, namely in parallel to the associated cutting surface. Furthermore, the grinding lamellae 25 are disposed so that they are offset with respect to one another, so that first the topside of the plates and then the underside of the plates are sharpened. In this arrangement of the sharpening lamellae 25, a high relative speed exists which causes an effi' cient sharpening of the plates 15.
  • the grinding device can also be attached to the cutting disk 9.
  • One embodiment thereof is shown in FIG. 15 in connection with FIGS.
  • grinding lamellae 26 are mounted to strips 27 of spring steel by means of bolts 28 at the cutting disk 9
  • the grinding lamellae 26 likewise contact alternatingly the topside and the underside of the respective cutting plate 15, so that a sharpening of the plate takes place on both sides.
  • a one-sided grinding operation can be sufficient.
  • the sharpening lamellae 25 or,26 can also be replaced by grinding rings or segments thereof.
  • a grinding ring can be fixedly arranged concentrically about the axis of the cutting disk 9, or such ring can be driven, so that the relative speed between the cutting plates and the grinding surface can be influenced.
  • the movement of the plates alone due to the friction of the cable during the cutting step will be sufficient to effect sharpening, since the cuts take place continuously at a high rate.
  • a device for cutting endless fibrous materials, particularly for the production of staple fibers from synthetic fibrous material which comprises a rotatably mounted support means, including drum means subjected to a suction draft, for feeding endless fibrous material to a cutting zone, and a rotatably mounted cutting means operatively associated with said drum means for cutting the fibrous material into staple length in said cutting zone; said drum means 'comprising a drum having an outer shell provided with an air permeable surface for retaining said fibrous material thereon by said suction draft and having an axis arranged at a spaced distance from and at right angles to an axis of rotation of said cutting means, said cutting means including a rotating disk having at least one cutting blade at its outer circumference for cutting through the fibrous material retained on said surface of the drum and said outer shell having means for preventing said at least one blade from contacting the surface of the outer shell during cutting of said fibrous material.
  • each cutting blade comprises a circular cutting disk smaller as compared to the rotating disk, these cutting disks being mounted on the outer periphery of the rotating disk in a rotatable manner, optionally in a driven manner.
  • each cutting blade is fashioned to be straight, but is aligned at an angle obliquely with respect to the tangent at the mounting point of this blade at the rotating disk.
  • each blade is attached at the rotating disk in an exchangeable manner.
  • the cutting means includes a worm wheel with at least one flight, a cutting edge being provided on said flights.
  • drum means has an outer air-permeable shell with a surface curved in a concave mariner.
  • drum means includes a drum that has an outer cylindrical shell, said shell being provided with grooves aligned obliquely with respect to the axis of the drum and spaced to determine the minimum staple length.
  • drum shell is formed by perforated sheet metal strips of a width approximately corresponding to the staple length.
  • said drum means includes fan means for producing said' suction draft
  • said device further including means so that the airdrawn by the fan means through the shell surface of the drum for retaining the fibrous material is at least partially conducted to the cutting zone in order to discharge the cut fibrous material.
  • said drum is a sieve drum covered by a cover along the portion of the shell not occupied by the fibrous material and the exhaust air of the fan means is conducted through a conduit into the space between the cover and the shell of the drum.
  • the device of claim 1 further comprising guide means forcing the fibrous material tautly stretched in the longitudinal direction on a drum of said drum means and engaging the material at least at the cutting zone.
  • the guide means includes a spring pressing from the outside against the material and thus against the drum.
  • the device of claim 17, further comprising a suction device discharging the cut fibrous material on the half of the drum not covered by the material on the other side with respect to the cutting means, a cover associated with the drum is extended up to the level of the cutting zone; and a suction nozzle is arranged directly beyond the rotating cutting means.
  • said means for preventing contact between the surface of the outer shell and said at least one cutting blade comprises means defining a plurality of parallel grooves on said outer shell, said grooves being spaced from each other to determine the minimum staple length and to allow successive entry of said at least one cutting blade therein during cutting of said fibrous material.
  • a device for cutting endless fibrous material, particularly for the production of staples from synthetic fibers which comprises a rotatably disposed support means for feeding the fibrous material to a cutting zone, said support means including drum means subjected to a suction draft; a rotatably mounted cutting means operatively associated with said drum means for cutting said fibrous material in said cutting zone; said drum means including a sieve drum having an outer shell and fan means for producing said suction draft; means operatively associated with said drum means so that the air drawn by the fan means through the shell surface of the drum for retaining the fibrous material thereon is at least partially conducted to the cutting zone in order to discharge the cut fibrous material; and a spiral housing surrounding the fan means extending, with its outlet duct, up to the cutting zone to thereby provide a staple fiber conveying duct, said sieve drum being covered by a cover along a portion of the shell not occupied by the fibrous material and exhaust air of the fan means being conducted through a conduit into the space between the cover and the shell of the drum.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Preliminary Treatment Of Fibers (AREA)
US24665972 1971-04-23 1972-04-24 Device for cutting endless material, for example for the production of staples from synthetic fibers Expired - Lifetime US3831473A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19712119821 DE2119821C3 (de) 1971-04-23 1971-04-23 Vorrichtung zum Zerschneiden von Endlosgut, z.B. Herstellen von Stapeln aus Chemiefasern
DE19712159485 DE2159485A1 (de) 1971-12-01 1971-12-01 Vorrichtung zum zerschneiden von endlosgut z. b. herstellen von stapeln aus chemiefasern
DE19722206255 DE2206255A1 (de) 1972-02-10 1972-02-10 Vorrichtung zum zerschneiden von endlosgut z. b. herstellen von stapeln aus chemiefasern

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US (1) US3831473A (enrdf_load_stackoverflow)
FR (1) FR2134430A1 (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4014231A (en) * 1974-12-06 1977-03-29 Akzona Incorporated Method and apparatus for cutting tow
US4254536A (en) * 1979-12-28 1981-03-10 Leigh Fibers Incorporated Fiber cutter
US4391169A (en) * 1980-08-11 1983-07-05 Hartford Fibres, Ltd. Cutter with angular blades and method for cutting rope therewith
US4896572A (en) * 1988-11-15 1990-01-30 Norandex Inc. Saw chip collector
US5060345A (en) * 1990-03-07 1991-10-29 Basf Corporation Loop cutter for bulked continuous filaments
US11453961B2 (en) * 2017-02-15 2022-09-27 Spinnova Oy Method and apparatus for manufacturing natural fiber based staple fibers on a common surface

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US2128746A (en) * 1936-12-05 1938-08-30 Joa Curt G Inc Sanitary napkin machine
US2217766A (en) * 1939-11-24 1940-10-15 Du Pont Staple cutting apparatus
GB639466A (en) * 1945-10-26 1950-06-28 Union Des Fabriques Belges De Improvements in or relating to machines for cutting bundles of continuous filaments into uniform lengths
DE1087317B (de) * 1955-02-28 1960-08-18 Emil Blaschke Vorrichtung zum fortlaufenden Schneiden endloser kuenstlicher Fadenbaender oder Kabel
US3218898A (en) * 1962-01-31 1965-11-23 Ici Ltd Rotating tools and grinders mounted on revolving toolholder for cutting artificial filaments
US3242783A (en) * 1963-12-02 1966-03-29 Schmermund Alfred Devices for cutting webs
US3342093A (en) * 1964-11-19 1967-09-19 Du Pont Perforated feed rolls with induced gas flow therethrough
US3410162A (en) * 1966-06-15 1968-11-12 Us Envelope Co Apparatus for manufacturing film record cards
US3468356A (en) * 1967-02-08 1969-09-23 Armour & Co Multi-edge rotary blade

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2128746A (en) * 1936-12-05 1938-08-30 Joa Curt G Inc Sanitary napkin machine
US2217766A (en) * 1939-11-24 1940-10-15 Du Pont Staple cutting apparatus
GB639466A (en) * 1945-10-26 1950-06-28 Union Des Fabriques Belges De Improvements in or relating to machines for cutting bundles of continuous filaments into uniform lengths
DE1087317B (de) * 1955-02-28 1960-08-18 Emil Blaschke Vorrichtung zum fortlaufenden Schneiden endloser kuenstlicher Fadenbaender oder Kabel
US3218898A (en) * 1962-01-31 1965-11-23 Ici Ltd Rotating tools and grinders mounted on revolving toolholder for cutting artificial filaments
US3242783A (en) * 1963-12-02 1966-03-29 Schmermund Alfred Devices for cutting webs
US3342093A (en) * 1964-11-19 1967-09-19 Du Pont Perforated feed rolls with induced gas flow therethrough
US3410162A (en) * 1966-06-15 1968-11-12 Us Envelope Co Apparatus for manufacturing film record cards
US3468356A (en) * 1967-02-08 1969-09-23 Armour & Co Multi-edge rotary blade

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4014231A (en) * 1974-12-06 1977-03-29 Akzona Incorporated Method and apparatus for cutting tow
US4254536A (en) * 1979-12-28 1981-03-10 Leigh Fibers Incorporated Fiber cutter
US4391169A (en) * 1980-08-11 1983-07-05 Hartford Fibres, Ltd. Cutter with angular blades and method for cutting rope therewith
US4896572A (en) * 1988-11-15 1990-01-30 Norandex Inc. Saw chip collector
US5060345A (en) * 1990-03-07 1991-10-29 Basf Corporation Loop cutter for bulked continuous filaments
US11453961B2 (en) * 2017-02-15 2022-09-27 Spinnova Oy Method and apparatus for manufacturing natural fiber based staple fibers on a common surface

Also Published As

Publication number Publication date
FR2134430A1 (enrdf_load_stackoverflow) 1972-12-08

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