US3855036A

US3855036A - Machine for producing non-woven nettings

Info

Publication number: US3855036A
Application number: US00328589A
Authority: US
Inventors: E Solbeck
Original assignee: Individual
Current assignee: Individual
Priority date: 1972-02-09
Filing date: 1973-02-01
Publication date: 1974-12-17
Anticipated expiration: 1991-12-17
Also published as: FR2171309A1; NL171180C; AT338738B; CH551521A; CA983367A; DK129170B; SE379380B; JPS565858B2; GB1416937A; ATA92673A; SU1050580A3; AU468542B2; DD102419A5; IT978937B; AU5196473A; NL7301680A; NL171180B; DE2304365A1; HK67276A; BE795178A

Abstract

A machine for producing non-woven flat nettings by laying one or more transverse threads helically across a plurality of parallel warp threads jointly advancing on a stationary support, the cross section of which is at least substantially circular so that a tubular web of netting is formed. The tubular web is slit axially into two or more individual nettings which is reshaped to a flat state by passing over stationary guide means. The guide means comprises for each netting a bail or hoop-like member, the ends of which are located in the vicinity of the points in which the tubular web is slit, and which extends forwardly from the support and preferably in continuation thereof. The netting is deflected outwardly and rearwardly (as compared to the direction of travel of the tubular web) over the bail member to a winding or feeding roller having a rectilinear axis and preferably located rearwardly of the tube slitting means. Between the roller and the bail member there may be provided a curvilinear bow roller and/or additional guide bars joined to the bail member and shaped so that relatively large zones at the edges of the netting are additionally deflected by the bars.

Description

United States Patent [1 1 Solbeck 1 i MACHINE FOR PRODUCING NON-WOVEN NETTINGS Erik Solbeck, No. 342 Vedhaek Strandvej, 2950 Vedbaek, Denmark [22] Filed: Feb. I, 1973 [21] Appl. No.: 328,589

[76] Inventor:

Primary Examiner-Daniel J Fritsch Attorney, Agent, or Firm- Browne, Beveridge, DeGrandi & Kline 1 Dec. 17, 1974 l l ABSTRACT v on a stationary support, the cross section of which is at least substantially circular so that a tubular web of netting is formed. The tubular web is slit axially into two or more individual nettings which is reshaped to a flat state by passing over stationary guide means. The guide means comprises for each netting a bail or hoop-like member, the ends of which are located in the vicinity of the points in which the tubular web is slit, and which extends forwardly from the support and preferably in continuation thereof. The netting is deflected outwardly and rearwardly (as compared to the direction of travel of the tubular web) over the bail member to a winding or feeding roller having a rectilinear axis and preferably located rearwardly of the tube slitting means. Between the roller and the bail member there may be provided a curvilinear bow roller and/or additional guide bars joined to the bail member and shaped so that relatively large Zones at the edges of the netting are additionally deflected by the bars.

9 Claims, 2 Drawing Figures PATENTEU 3.855.036

sum 1 u; 2

FIG!

PATENTEB DEC] 7 I874 SHEET 2 OF 2 MACHINE FOR PRODUCING NON-WOVEN NETTINGS BACKGROUND OF THE INVENTION The present invention relates to a machine for producing nonwoven nettings comprising warp and transverse threads which intersect or cross each other and are bonded to each other at their points of cross-over. The machine is of the kind which has a stationary support of at least substantially circular cross section and arranged for supporting a cylindrical layer of mutually parallel warp threads which are advanced along said support by any suitable means, such as a pair of rollers, through the nip between which the finished netting is pulled forward, at least one rotating thread guide for laying a transverse thread in a helical configuration around the layer of warp threads, means for axially slitting the hose-like web thus formed into at least two individual nettings, and guide means for straightening or flattening each netting during its travel from the slitting means such that the netting is at least substantially flat when it is led over a rotatable roller spaced from the, support.

Machines of this kind are known from the specifications of US. Pat. No. 2,797,728, issued July 2, 1957, to G. Slayter et a]. and US. Pat. No. 3,384,521, textile issued May 21, 1968, to G. W. B. Borup. Depending upon the properties of the processed threads, the spacing between adjacent warp and/or transverse threads,

the speed of rotation of the thread guide and the rate of advance of the warp threads, it is possible to manufacture fabrics of a widely different nature. To quote an example, netting for reinforcing paper or plastics sheet material may be produced from relatively coarse plastics or glass fibre yarn and, in the opposite extreme, the machine may be adapted to produce gauze-like fabrics of small mesh width from fine denier texile threads on yarns. The bonding between the warp threads and the transverse threads can be effected in any suitable way, eg by means of an adhesive applied to one or the other thread system or merely by heating the threads if these are fabricated from or coated with a thermoplastic material.

The machine operates in all instances at a high rate of production and, particularly in order to maintain a uniform tension in the transverse thread or threads, it is important that the hose-like web formed by the laying operation is at least approximately circular in cross section before it is slit axially. On the other hand, this cross sectional shape implies in the prior art machines that the reshaping of the individual nettings to the flat state which is necessary for permitting the subsequent winding-up of the nettings, takes place during a relatively long travel of the netting after the originally tubular web has been slit, and consequently the machine, which normally is vertically oriented becomes correspondingly high. In practice it has been found that the ratio between the necessary height of the machine and the width of the nettings, which can be produced in the machine, is an important restrictive factor in respect of the width of nettings which can be manufactured. It is an object of the invention to eliminate this disadvantage.

BRIEF SUMMARY OF THE INVENTION According to the invention there is provided a machine for producing a non-woven netting comprising crossing warp and transverse threads connected together at their points of cross-over, said machine having a stationary frame including support means of at least substantially circular cross section for supporting a plurality of parallel warp threads in the form of a cylindrical thread layer, means for jointly advancing said warp threads in their longitudinal direction, at least one rotary thread guide for laying a transverse thread in a helical configuration around said layer of warp threads to form a hoselike web, drive means for rotating said thread guide, means for longitudinally slitting said hose-like web into at least two individual nettings, at least two rotatably supported rollers spaced from said support means and having rectilinear axes, and guide means between said slitting means and each of said rollers for reshaping each netting into a flat shape, said guide means comprising a stationary guide member formed with a curvilinear guiding edge located adjacent the path of said hose-like web and extending from its ends, which are located downstream of the associated slitting means, symmetrically outwardly from a line connecting the slitting means and forwardly in the direction of advance of said hose-like web, whereby the centre point of said edge is located furthest away from said connecting line, the axes of said rotatable rollers being located rearwardly of said centre point of the guiding edge, as seen in the direction of travel of said hose-like fabric. I

The construction of the known machines referred to above appears to permit the conclusion that it has hitherto been generally assumed that in order to obtain a netting having at least substantially rectangular meshes, that is to say with relatively little distortion or deformation of the netting during its reshaping from a partcylindrical to a flat shape, it was mandatory to advance the individual nettings in the same direction during the reshaping as during the formation of the tubular or hose-like web and at the same time stretch them in the lateral direction and move the central position of the netting towards the axis of the tubular web.

The present invention is based on the new and surprizing recognition that it is possible to achieve the same effect by leading each netting from the point at which the tubular web is slit to the winding means across suitably shaped stationary members which at the same time successively flatten or spread out the netting to flat shape and during its flattening operation cause the netting in its entirety to follow a path extending outwardly relative to the axis of the cylindrical support. This leads to the result that the dimension of the machine in the direction of the axis may be considerably shorter than in the prior art machines. It has been found possible to construct a vertical machine, the height of which does not exceed half the circumferential length of the unslit hose-like web, that is to say, less. than half the necessary height of a machine constructed according to the principles hitherto employed. In practice this means that it is possible to install, in premises having a given ceiling height, a machine which is capable of producing netting having twice the width it has previously been possible to produce in the same premises.

With the novel guide means of the present invention for flattening the netting it is possible to ensure not only that between the slitting station and said roller, at which the netting is straightened out into a flat shape, the individual warp threads all follow equally long paths so that the flat netting has rectangular meshes, but also that the rectangular mesh shape is maintained during the flattening operation in which the various zones of the width of the netting are successively deflected across the guiding edge. This means that only comparatively weak stresses act on the individual threads and on the adhesive connections at the points of crossover because the warp threads, during their travel, do not have any significant tendency towards being displaced in the lateral direction whereby they would exert tractional forces on the connecting transverse threads.

It is possible, therefore, to reduce the quantity of adhesive used for joining the threads together and the unfolding or flattening operation may start very shortly after the tubular web has passed the area in which the thread guide laying the transverse thread is operative, that is to say, at a time when the bonded points may not have reached their full strength yet. This also contributes to reduce the dimension of the machine in the advancing direction of the tubular web, that is to say, the height of the machine in the case of the vertically oriented machine discussed above.

The guide edge may extend at least substantially contiguous. to the cylindrical path of movement of the hose-like fabric and the axes of the rotatable rollers may be located rearwardly of the line connecting the end points of the guiding edge. Both these details contribute to reducing the space requirement of the machine in the axial direction as well as perpendicularly hereto.

The guiding edge may be formed by a curvilinear bail or hoop-like member which, between its ends is supported relative to the frame of the machine by means of at least two struts, the length of which is adjustable. Thus, the friction on the netting during the flattening operation is reduced, since it moves freely both upstream and downstream of the bail. It is, however, within the scope of the invention to employ guide means having larger dimensions in the direction of movement of the netting, for example, a guide means made from sheet metal. With such a more or less continuous guiding means it is possible to achieve correspondingly more gradual or uniform deflections or changes of direction in the paths of the individual threads.

Two stationary guide bars may be arranged between the bail and the roller so as to issue symmetrically from two points between the extremities of the bail and extend outwardly towards the ends of the roller. By adding these guide bars it is possible to render the changes in direction of the warp threads in the edge zones of the netting less sudden or acute and hence to reduce the stresses on these threads.

It has been found expedient to connect the guide bars to the bail at points, the projections of which upon the axis of the associated roller are located approximately one third of the roller length from the ends thereof, so that the two outermost thirds of the width of the netting are deflected across both the bail and the guide bars, while the centremost third is deflected only over the centremost portion of the bail.

The aforesaid length-adjustable struts for supporting the bail may be connected to the bail at the same points as the guide bars, which latter may be supported or braced relative to the frame of the machine by means of length-adjustable struts, whereby a fine adjustment of the path lengths of the warp threads is rendered possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 of the accompanying drawings is an elevational view of a machine embodying the invention, and

FIG. 2 is a view seen from the lefthand end of FIG. 1.

In both figures portions of the machine and the nettings produced have been cut away in order to provide a clearer view.

DETAILED DESCRIPTION The machine illustrated in the drawings has a frame comprising two heavy, substantially mirror-image, boxshaped end members 1 and 2 connected at the base of the machine by means of longitudinally extending box girders 3. Four oblique struts 4 projecting upwardly from the end members I and 2 are, at their top, connected to two box girders 5 extending in the longitudinal direction and being, in turn, connected through horizontal transverse girders 6. Four vertical columns or supports 7 are suspended in the centre of the machine from the transverse girders 5 and the supports which, in a suitable manner, may be additionally braced against each other, carry the means described below for supporting the warp threads of a netting that is being produced in the machine.

Said supporting means comprise an annular heating means 8 secured to a strong base plate 9 which is rigidly connected to supports 7. As shown, heating means 8 may be a hollow sheet metal structure the inside of which is filled with a suitable insulation material 10. On the inside of ring 8, a heating element 11 is fitted. A cooling ring 12 is mounted above ring 8 and, as shown, ring 12 may be provided with apertures in its surface behind which motor-driven blowers I3 aremounted for ejecting cooling air through the apertures. Each aperture can, as shown to the left-hand side of FIG. 1, be covered by a filter screen or mesh. An additional cooling ring 14 mounted above ring 12 is hollow and a liquid coolant may be circulated through ring 14 to effect an additional cooling of the produced netting. Rings 12 and 14 are secured to supports 7 in a manner not shown in detail.

Two concentric rings 15 and 16 are suspended on the underside of plate 9 and the rings, which may be fabricated from round bars, are provided with radially aligned pairs of cuts or recesses which serve as guides for the warp threads mentioned above and shown in FIG. 1 at 17. The warp threads are supplied from stationary bobbins (not shown) or similar supplies mounted outside the machine, that is to say, to the lefthand side in FIG. I, and each warp thread is passed through a flexible tube 18 that may be fabricated from transparent plastics material. As indicated in FIGS. 1 and 2, tubes 18 may expediently be held together by clips 19 and 20, of which the former surround all the tubes while each clip 20 surrounds a smaller group of tubes, the arrangement being adapted to obtain the desired uniform distribution of warp threads 17 along the circumference of guide rings 16 and 15.

Two transverse or weft threads 21 and 22 are supplied from separate stationary thread supplies via guide tubes 23 and 24, respectively, which, via rotary or swivel couplings 25, are connected to opposite ends of a rotating hollow shaft 26 journalled coaxially with the rings 8, 12 and 14. A pulley 27 is secured to shaft 26 for driving the shaft through a belt (not shown) from a motor 28 shown diagrammatically in FIG. 2, e. g. a hydraulic motor that is fed from a pump (not shown) in the frame of the machine. To the rotating shaft 26 there is secured a twin thread guide comprising two hollow arms 29, which project from shaft 26 in diametrically opposed directions and which, at their ends, are formed with eyelets or other suitable means for guiding the two transverse threads 21 and 22 which thus are helically wound around the warp threads 17 advancing in an upwardly direction along ring 8. Thus, there is produced a tubular netting, the meshes of which, with a fairly good approximation, are rectangular depending upon the ratio between the rate of advance of the warp threads 17 and the peripheral speed of the thread guides rotating with shaft 26.

The warp threads and the transverse threads may be joined together at their mutual points of crossover or intersection in a manner known per se. For instance, each warp thread may be coated, prior to its introduction into the associated guiding tube 18, with an adhesive which melts under the influence of the heat transferred from ring 8 to the threads and which subsequently solidifies due to the cooling effect of rings 12 and 14.

When the warp and/or transverse threads are fabricated from thermoplastic material or are coated with such a material, it might alternatively be possible to carry out the bonding operation solely by heating the threads during their passage along ring 8 which, incidentally, may be heated in any appropriate manner, including direct oil or gas burners mounted internally of the ring.

The netting thus formed, which, after having passed cooling ring 14, still has a hose or stocking-like shape, is subsequently slit axially at two diametrically opposed points by means of electrically heated wires 30 that project inwardly between two adjacent warp threads and which sever the transverse threads during the advance of the netting. The wires 30 are mounted on two brackets 31 which, with the aid of struts 32, are secured to a plate 33 which, in turn, is secured to horizontal girders 34 extending between the vertical supports 7.

To each plate 33 there are secured two bail or hoop shaped guide members 35 that may be fabricated from tubing and which, from their opposite ends at which they are mounted on said plates-extend obliquely upwards towards the apex or centre of each member. As shown, the members 35 extend generally in or on a cylindrical surface which is coaxial with rings 8, 12 and 14 and has approximately the same diameter as the rings. As can be seen from FIG. 1, the central portion 35a of each member 35 is comparatively slightly curved, while the two end portions 35b are more strongly curved, i.e. they have smaller radii of curva ture. Members 35 are, besides being secured to plates 33 at their ends, supported from the frame of the machine approximately at the points where

sections

35a and 35b merge into each other. The additional support is provided by two oblique struts 36 the lower ends of which are secured to the end members 1 and 2 of the frame. The length of struts 36 may be adjustable by means of adjusting mechanisms 37 of the turnbuckle type provided with right and left hand thread, which mechanisms may be provided at one or, as shown, both ends of each strut. The lower end of a guide bar 38 bent through an obtuse angle and which, like the members 35 and struts 36, may be fabricated from tubing, is secured to each strut 36 by means of an adjusting mechanism 37. The upper end of each guide bar 38 is joined to one of members 35 in the proximity of the point where the associated strut 36 is connected. Guide bar 38 is not secured to member 35 but is connected to strut 36 by means of a tab 39 secured to the strut and a pivot pin extending through a fork 40 secured to guide bar 38. Furthermore, each guide bar is supported relative to the adjoining end member 1 or 2 of the frame by means of a rod 41, and by forming rod 41 with right and left hand threads analogously with adjusting mechanisms 37, its length may be adjustable.

Two rotatable bow rollers 42 having curvilinear axes are supported on the end members 1 and 2 of the frame outside members 35 and with the virtual or imaginary axis of each roller, that is to say, the straight line connecting the ends thereof, extending parallel to the connecting line between the two points at which the netting hose is severed by means of wires 30. Each roller comprises in a known manner an external tubular sheath 51 made of rubber or similar material and journalled on a curved shaft 52 by means of anti-friction bearings (not shown) distributed at appropriate intervals along the length of the roller. At each end shaft 52 is connected, by means of a universal joint 53, to a stub shaft 54 which, during the operation of the machine, is held stationary in a bearing pedestal 55. Sheath 51 is thus able to rotate on the stationary curved shaft 52, the orientation of which relative to the vertical axis of the machine can be adjusted by turning the stub shafts 54 in their bearing pedestals 55 with the aid of suitable adjusting devices (not shown). Moreover, the bearing pedestals may be adapted to be individually shifted on frame members 1 and 2 towards and away from the vertical axis, that is to say, towards the left or the right in FIG. 2. Due to their curvature, the rollers counteract possible tendencies towards the formation of creases in the netting webs and, in addition the above-mentioned adjustments of the orientation of each roller axis permit a fine adjustment of the lengths of the paths travelled by the individual warp threads analogously with the adjustment effected with the aid of rods 41 which support the guide bars 38.

Below each roller 42 two

rollers

43 and 44 are journalled in the frame members 1 and 2, and

rollers

43, 44 which are normally biased against each other, are driven by a common motor in opposite directions of rotation, so that they serve to advance or pull forward the netting between them. From roller 44, the netting passes over two guide rollers 45 before it is wound onto a driven winding roller 46. The two

rollers

43 and 44 are driven at a normally constant speed which is related to the speed of rotation of shaft 26 in such a way that the desired mesh width is obtained in the netting. Roller 46 may be driven by a motor adapted to deliver a torque which is constant irrespective of the variations in the diameter of the web of netting wound onto roller 46.

It will be understood from what has been explained above that during the operation of the machine, two webs of netting are formed which from the original semi-cylindrical cross-sectional shape are successively reshaped into a plane or flat condition before each web passes into the gap between

rollers

43 and 44. For effecting this straightening or flattening operation each netting is first advanced upwardly and outwardly across the associated member 35 and, subsequently, across 'roller 42 whereby, however, the edge zones the width of which, in the embodiment shown, approximates one third of the total width at each side of the netting, are additionally led over the guide bars 38 between member 35 and roller 42. By appropriate shaping of said guide or flattening means it is possible to achieve that the length of the path travelled by each individual warp thread I7 of the netting from the cuttin point to the gap between

rollers

43 and 44 is identical for all warp threads. This means that also in the flattened and subsequently rolled-up netting the transverse threads 21 and 22 are located practically perpendicularly to the warp threads, to be more precise, at the same angle thereto during the helical winding of the transverse threads when the warp threads are supported by ring 8. Since the width of the flattened netting, as appears from FIG. 1, is considerably greater than the diameter of the hose-like netting, viz. approximately 1.57 times as big, the outermost warp threads of the netting which, in the drawings, are designated by 17a, have to move outwardly in the direction of the axis of winding spool 46, however, the greater length of travel of these warp threads as compared to the travel of the centremost warp threads 17b in the netting is compensated for by the extension of the path of travel of threads 17b, which is achieved by the shape of the upwardly directed member 35 and the guide bars 38 descending therefrom.

It is remarked that the slitting of the hose-like netting into two or more individual netting structures may be effected in any suitable manner, it is possible, for instance, to employ rotating knives instead of the heated wires shown for slitting a netting fabricated from glass fibres.

What I claim is:

1. In a machine for producing a non-woven netting comprising crossing warp and transverse threads connected together at their points of crossover, said machine including a stationary frame having support means of at least substantially circular cross section for supporting a plurality of parallel warp threads in the, form of a cylindrical thread layer,

means for jointly advancing said warp threads in their longitudinal direction,

at least one rotary thread guide for laying a transverse thread in a helical configuration around said layer of warp threads to form a hose-like web, drive means for rotating said thread guide,

means for longitudinally slitting said hose-like web into at least two individual nettings,

at least two rotatably supported rollers spaced from said support means and having rectilinear axes, and guide means between said slitting means and each of said rollers for reshaping each netting into a flat shape, the improvement wherein said guide means comprises a. a stationary guide member formed with a curvilinear guiding edge located adjacent the path of said hose-like web with its ends located downstream of the associated slitting means and extending from said ends symmetrically outwardly relative to a line connecting the slitting means and forwardly in the direction of advance of said hose-like web whereby the center point of said edge is located furthest away from said connecting line, the axes of said r0- tatable rollers being located rearwardly of said center point of the guiding edge, as seen in the direction of travel of said hose-like fabric, and

b. two stationary guide bars each located between said guiding edge and an associated roller, which bars issue symmetrically from two points intermediate the ends of the guiding edge and extend outwardly towards the ends of the roller.

2. A machine as claimed in claim 1, wherein said guiding edge extends at least substantially contiguous to the cylindrical path of movement of said liosc-like fabric.

3. A machine as claimed in claim 1 wherein the axes of the rotatable rollers are located rearwardly of a line connecting the ends of said guiding edge, as seen in the direction of travel of the hose-like web.

4. A machine as claimed in claim 1, wherein said guiding edge is provided by a curvilinear bail-like member and at least two struts having means for adjusting their length are connected between said frame and said bail-like member intermediate the ends thereof.

5. A machine as claimed in claim 4, wherein the struts connecting said frame with said bail-like member and the guide bars are connected to the bail-like member at the same points as said stationary guide bars.

6. A machine as claimed in claim 1, wherein the guide bars are connected to the guide member at points, the projections of which upon the axis of the associated roller are located approximately one third of the roller length from the ends thereof.

7. A machine as claimed in claim 1 comprising struts having means for adjusting their length and connected between said guide bars and said frame of the machine.

8. A machine as claimed in claim 1, wherein said guide means further comprises a freely rotatable bow roller having a curvilinear axis and being mounted between each guiding edge and the associated rotatable roller having a rectilinear axis.

9. A machine for producing a non-woven netting comprising crossing warp and transverse threads connected together at their points of crossover, said maching including a stationary frame having support means of at least substantially circular cross section for supporting a plurality of parallel warp threads in the form of a cylindrical thread layer,

means for jointly advancing said warp threads in their longitudinal direction,

at least one rotary thread guide for laying a transverse thread in a helical configuration around said layer of warp threads to form a hose-like web,

drive means for rotating said thread guide,

at least two rotatably supported rollers spaced from said'support means and having rectilinear axes, and guide means between said slitting means and each of said rollers for reshaping each netting into a flat shape, the improvement wherein said guide means comprises a. a stationary guide member formed with a curvilinear guiding edge located adjacent the path of said hose-like web with its ends located downstream of the associated slitting means and extending from said ends symmetrically outwardly relative to a line tion of travel of said hose-like fabric, and

b. two freely rotatable bow rollers having curvilinear axes, each of said bow rollers being mounted between one of said guiding edges and the associated rotatable roller having a rectilinear axis.

Claims

1. In a machine for producing a non-woven netting comprising crossing warp and transverse threads connected together at their points of crossover, said machine including a stationary frame having support means of at least substantially circular cross section for supporting a plurality of parallel warp threads in the form of a cylindrical thread layer, means for jointly advancing said warp threads in their longitudinal direction, at least one rotary thread guide for laying a transverse thread in a helical configuration around said layer of warp threads to form a hose-like web, drive means for rotating said thread guide, means for longitudinally slitting said hose-like web into at least two individual nettings, at least two rotatably supported rollers spaced from said support means and having rectilinear axes, and guide means between said slitting means and each of said rollers for reshaping each netting into a flat shape, the improvement wherein said guide means comprises a. a stationary guide member formed with a curvilinear guiding edge located adjacent the path of said hose-like web with its ends located downstream of the associated slitting means and extending from said ends symmetrically outwardly relative to a line connecting the slitting means and forwardly in the direction of advance of said hose-like web whereby the center point of said edge is located furthest away from said connecting line, the axes of said rotatable rollers being located rearwardly of said center point of the guiding edge, as seen in the direction of travel of said hose-like fabric, and b. two stationary guide bars each located between said guiding edge and an associated roller, which bars issue symmetrically from two points intermediate the ends of the guiding edge and extend outwardly towards the ends of the roller.

2. A machine as claimed in claim 1, wherein said guiding edge extends at least substantially contiguous to the cylindrical path of movement of said hose-like fabric.

5. A machine as claimed in claim 4, wherein the struts connecting said frame with said bail-like member are connected to the bail-like member at the same points as said stationary guide bars.

9. A machine for producing a non-woven netting comprising crossing warp and transverse threads connected together at their points of crossover, said maching including a stationary frame having support means of at least substantially circular cross section for supporting a plurality of parallel warp threads in the form of a cylindrical thread layer, meaNs for jointly advancing said warp threads in their longitudinal direction, at least one rotary thread guide for laying a transverse thread in a helical configuration around said layer of warp threads to form a hose-like web, drive means for rotating said thread guide, means for longitudinally slitting said hose-like web into at least two individual nettings, at least two rotatably supported rollers spaced from said support means and having rectilinear axes, and guide means between said slitting means and each of said rollers for reshaping each netting into a flat shape, the improvement wherein said guide means comprises a. a stationary guide member formed with a curvilinear guiding edge located adjacent the path of said hose-like web with its ends located downstream of the associated slitting means and extending from said ends symmetrically outwardly relative to a line connecting the slitting means and forwardly in the direction of advance of said hose-like web whereby the center point of said edge is located furthest away from said connecting line, the axes of said rotatable rollers being located rearwardly of said center point of the guiding edge, as seen in the direction of travel of said hose-like fabric, and b. two freely rotatable bow rollers having curvilinear axes, each of said bow rollers being mounted between one of said guiding edges and the associated rotatable roller having a rectilinear axis.