EP1309256B1 - Eyelet for reinforcing the edge of a hole in a carrier strip and device for attaching an eyelet to a carrier strip - Google Patents

Abstract

The invention relates to a ringless eyelet ( 10 ') comprising a plate ( 11 ) arranged on the display side ( 23 ) of the carrier strip ( 20 ), and a tube-shaped collar penetrating the hole in the carrier strip. The hem of the collar of the eyelet element ( 10 ') is supported on the rear side ( 24 ) of the carrier strip ( 20 ). The aim of the invention is to connect the eyelet to the carrier strip ( 20 ) faster and in a more cost-effective manner. In order to achieve this, the free end part of the collar of the eyelet element ( 10 ') is provided with projections ( 16 ). An essentially closed ring profile ( 50 ), into which the collar projections ( 16 ) are integrated, is created when the collar is hemmed. After hemming, pressure points ( 40 ) are created on the carrier strip ( 20 ) between the collar projections ( 16 ) and the abutment surfaces ( 49 ) formed by the plate ( 11 ), said pressure points reliably holding the carrier strip ( 20 ). Said carrier strip ( 20 ) extends namely inside ( 51 ) the ring profile ( 50 ) beyond the pressure points ( 40 ). An eyelet is obtained using only one.

Description

The invention is initially directed to an eyelet for reinforcing the rim around a hole in a track.

Normally, two-part eyelets (EP 0 655 205 B1, US Pat. No. 4,479,287 A, FIGS. 1, 12) which consist of an eyelet part and a disk part are used for this purpose. The eyelet has a plate that comes to rest on the show side of the carrier side when riveting, while sitting on a plate tubular neck cuts a hole in the carrier web and is crimped more or less C-shaped with its free end. By flanging the tail of the neck is stiffened. The rigid end piece is supported on the disc part, whereby the carrier web is compressed between the disc part and the plate. Despite its high material cost, such a riveted two-piece eyelet has insufficient tear resistance.

There are also one-piece eyelets are known which have no disc part and consist only of an eyelet. In one case (US 4,479,287 A, FIG. 8), the neck of a such Ösenteils folded over in a U-shape, whereby the free end of the beaded neck extends substantially parallel to the flat plate of the eyelet. In another case (DE 299 03 124 Ul, Fig. 3b), the end of the neck is not only folded during the riveting process, but dissected by cutting in the riveting tool in tab-like holding elements. The folded ends of the neck are not rigid, especially when they are cut in tabs. As a result, the carrier web is not sufficiently compressed, which is noticeable in a comparison with the aforementioned two-piece eyelet less tear resistance of the riveted eyelet.

But there are also one-piece eyelets of the type mentioned in the preamble of claim 1 known (US 4,479,287 A, Fig. 2), in which the beading produced during riveting has a substantially self-contained annular profile, in which practically rolls up the entire neck length , The neck of this known eyelet has a smooth end edge. Although the neck is stiffened by its annular bead, this discless eyelet has a lower pull-out strength compared to the two-part eyelet mentioned above. Even this one-piece eyelet could not prevail in practice.

There are one-piece eyelets of another type, where the end piece of the neck is deformed C-shaped during beading. In one case (EP 0 673 611 A2), a gap remains between the smooth end edge of the C-shaped neck and the arcuately profiled plate, where the carrier web is clamped. In the crest of the plate, a circumferential ring rib is arranged with spikes in places. The transition area between the plate and the neck is provided with conical stabilizing ribs, which prevent beading of this area. The tips and the annular rib in the interior of the curved plate should cause a security against rotation of the carrier web. The carrier web assumes a labyrinth course between the annular rib and the neck end edge in the interior between the arcuate plate and the C-profile of the neck. In another case (DE 669 779 A) is. the C-shaped neck flared with its smooth End edge pressed substantially vertically into the carrier web. To avoid bursting the neck end piece when crimping, the neck od without any incision. The like. Be formed. When flanging radial riveting in the folded eyelet edge are impressed by the riveting tool, which should strengthen the crimp end. Due to the corrugated flanging end, the bending stiffness of the neck end piece already produced by the C profile is further increased, so that the folded loop edge can penetrate vertically into the surface of the carrier web. The pull-out strength of such one-piece eyelets with a C-shaped flared neck has no higher tear resistance than the two-part eyelet mentioned at the outset.

In another one-piece eyelet, in which the neck of the eyelet also has only one C-profile (US Pat. No. 2107,375), a blunt neck end is important in order to avoid bursting of the neck end. Therefore you strengthen the neck end occasionally with a circumferential bead. Furthermore, the neck end is compressed prior to riveting by means of a special tool, whereby in the compression area flattened mountains and arcuate passages arise. When upsetting arise radial end extensions, which increase the wall thickness of the neck in addition to the edge bead and therefore increase the flexural rigidity of the bead. Nevertheless, the pull-out strength of such a riveted eyelet with respect to the two-part eyelet mentioned above is lower.

Insofar as radial or axial profilings are provided in the prior art (DE 669 779 A, US Pat. No. 2,107,375 A) at the beaded edge or at the front end of the neck, they serve to reinforce and stiffen the beaded neck end piece. These profiled neck ends are, as stated, used only in connection with a C-profile and therefore encounter substantially vertical and blunt on the surface of the carrier web. As a result, the profiled neck ends extend only transversely to the tensile loads exerted on the carrier web in the case of use, which explains the low pull-out strength of these known eyelets.

The invention has for its object to develop an inexpensive, quickly attachable eyelet specified in the preamble of claim 1 species, which is characterized by a high pull-out strength after Annieten on the carrier web. This is inventively achieved by the measures listed in claim 1, which have the following special significance.

Already in the unprocessed initial state axial projections are arranged at the free end of the neck and the neck is practically deformed during beading with its entire neck length to a substantially self-contained ring profile, in which the projections are included. This results in holding means in which the neck projections produce special pressure points on the detected carrier web, against which the carrier web is subject to tensile stresses. The integrated in the ring profile neck projections are the interposition of the hole edge portion of the carrier web to abutment surfaces, which are formed by the curvature of the plate or the transition between the plate and the neck of the eyelet. In the annular beading, the neck projections point in the opposite direction to the tensile loads exerted on the carrier web in the case of use, which makes the eyelet according to the invention considerably safer than the prior art. This surprising result can be explained as follows.

In contrast to the prior art, which aims at the highest possible stiffness at the neck end, the flexural rigidity of the beaded edge is reduced in the eyelet according to the invention. This is achieved by the initial axial extending neck projections, which act compared to the substantially rigid, shaped to a ring profile neck rest like a wreath flexible tongues and after the beading, as I said, the tensile loads are directed opposite. At the pressure points, there is a step-shaped increase of the web material in front of the neck projections. For tensile loads, the bendable neck projections are taken, spread apart with respect to the axis of the riveted eyelet apart and against the circumferential Abutment surface of the plate pressed. The tongue-like neck projections thus act as "spreading clamps", which are increasingly pressed against the carrier web with increasing pull-out force. In comparison with the much more expensive two-piece eyelets obtained in the invention, a 30% to 75% higher tear resistance. This is especially true when riveting in flexible or stretchable carrier webs that could not be satisfactorily equipped with a one-piece eyelet so far.

For the formation of the axial neck projections, it is recommended to provide the neck of the eyelet with a serrated end edge. The neck projections are already co-produced in the production of the eyelet, whereby special operations or processing tools for profiling can be saved. When pulling the ring mold during the beading, the tooth digs into the web material and it can come to a step-like increase along the tooth profile. Apart from the aforementioned Spreizklemmung it then comes to a positive connection between the tooth and the carrier web. The higher the tensile load applied to the carrier web, the stronger the carrier web digs in front of the antiparallel tooth.

The invention is further directed to a device for attaching the eyelet according to the invention. In the known device (US 1,838,973 A), which is, however, intended for two-piece eyelets, jump the pressure ring in the lower tool against the local cutting edge. The upper tool has an axially movable central insert with a bore that projects axially relative to the adjacent surfaces of the upper tool. During the working stroke of the two tools, the carrier web is pressed into the pressure ring by the central insert of the upper tool; before the central insert hits the cutting edge of the lower tool and thereby cuts the hole in the carrier web. The carrier web is in the local two-piece eyelet, which also has the part already mentioned above except the eyelet unsightly attached. It comes to wrinkles in the carrier web.

The invention is therefore based on the further object of developing a device for the one-piece eyelet mentioned in claim 1, which can be fastened beautiful and tear-resistant to the carrier web. This is inventively achieved by the measures mentioned in the characterizing part of claim 9, which have the following special significance.

In the invention, the pressure ring in the lower tool in the opposite direction kraftbetasteter counter-pressure ring in the upper tool is assigned. It is recommended, according to claim 10, to provide these two rings with mutually facing oblique and Gegenschrägflächen. During the stroke movement of the two tools, the carrier web is clamped between these two rings, wherein the inclined surfaces provide for an additional smooth pulling of the carrier web. This will maintain a smooth course of the carrier web during subsequent crimping of the one-piece eyelet, resulting in a proper attachment of the eyelet to the carrier web. Clamping minimizes material feed. This has the consequence that the pitches between the eyelets can be maintained exactly and the tolerance deviations are greatly limited even over long tarpaulin lengths.

Fig. 1 und 2,

jeweils in Draufsicht, die Schauseite bzw. die Rückseite einer mit der erfindungsgemäßen Öse ausgerüsteten Trägerbahn,

Fig. 3,

in starker Vergrößerung, eine Querschnittansicht durch die in Fig. 1 gezeigte angesetzte Öse längs der dortigen Schnittlinie III - III,

Fig. 4

einen Axialschnitt durch den besonderen Ösenteil der erfindungsgemäßen scheibenlosen Öse im Ausgangszustand, nämlich vor seiner Verarbeitung an der Trägerbahn,

Fig. 5,

in Vergrößerung, eine ebene Abwinklung eines Teilstücks des mit Ziff. V in Fig. 4 gekennzeichneten Randbereichs vom erfindungsgemäßen Ösenteil und

Fig. 6,

in axialem Halbschnitt, Bruchstücke einer zweiteiligen erfindungsgemäßen Vorrichtung zur Verarbeitung des in Fig. 4 gezeigten Ösenteils, wobei das Oberwerkzeug sich gegenüber dem Unterwerkzeug im oberen Endpunkt seiner Hubbewegung befindet.

Further measures and advantages of the invention will become apparent from the dependent claims, the following description and the drawings. In the drawings, the invention is shown in one embodiment. Show it:

1 and 2,

each in plan view, the show side or the back of a equipped with the eyelet invention carrier web,

3,

in high magnification, a cross-sectional view through the attached eyelet shown in Figure 1 along the section line III - III there,

Fig. 4

an axial section through the special Ösenteil the discless eyelet according to the invention in the initial state, namely before its processing on the carrier web,

Fig. 5,

in magnification, a flat bend of a section of the with ziff. V in Fig. 4 marked edge portion of the eyelet according to the invention and

6,

in axial half-section, fragments of a two-part device according to the invention for processing the eyelet shown in Fig. 4, wherein the upper tool is opposite to the lower tool in the upper end point of its stroke movement.

An eye should, as shown in FIGS. 1 and 2, reinforce the edge region 21 of a hole 22 cut in a carrier web 20. The carrier web 20 is usually a flexible and optionally stretchable structure, eg a motor vehicle tarpaulin. The invention achieves the desired hole reinforcement with a one-piece eyelet 10. In Fig. 4 and 5, the eyelet 10 is shown in its initial state, before the Processing. By contrast, FIGS. 1, 2 and 3 show the eyelet part 10 'after its processing, in the finished state of use, during its hole reinforcing function.

The eyelet 10 can be divided into a curved, substantially radially extending plate 11 and an axially extending tubular neck 12. For reasons of a better dimensional stability and to be described in more detail annular flange of the neck 12 of the plate 11 is provided with a buckling profile 13. This results in a particularly conspicuous arcuate transition 14 between the plate 11 and the neck 12. The neck is provided in its free end 15 with axial, so in the direction of the neck 12 extending projections 16. These consist in the present case of a recognizable in Fig. 5 arcuate toothed end edge 17. This has the following special appearance.

The tooth tips 17 are provided with convex curves 27, while the tooth spaces 18 have concave curves 28. This results in the tooth profile 19 a waveform. The waveform is unbalanced. That is, the radius of curvature of the curves 27 of the tooth tips 17 is made smaller than that of the curves 28 of the tooth spaces.

This eyelet 17 is attached to the carrier web 20 in the device 30 shown in FIG. The device 30 consists of essentially five mutually axially displaceable parts with respect to time. This first includes a stationary in the present case lower tool 32, which carries a contrast axially movable pressure ring 34. Furthermore, the device 30 includes an upper tool 31 which is actively movable relative to the lower tool 32 and has a central insert 33 arranged coaxially therein, which, in contrast, is also passively axially movable. Finally, the upper tool 31 is enclosed in the peripheral region by a likewise axially passively axially movable counter-pressure ring 54. The central insert 33 and the counter-pressure ring 54 are force-loaded in the sense of the force arrows 35 and 55 against the lower tool 32, while the pressure ring 34 in the lower tool 32, to a mirror image, in the sense of the force arrow 36 against the upper tool 31 under the action of a crowd of springs 56th stands, which are mounted in axial bores of the lower tool 32. The springs 56 are as Spiral springs formed in the helical interior of the pressure ring 34 seated pins 57 engage. The tool group 31, 33, 54 on the one hand and 32, 34 on the other hand are lift-movable relative to one another, as illustrated by the movement arrow 37 of the upper tool group 31, 33, 54.

The counter-pressure ring 54 is guided on the circumferential surface 63 of the upper tool 31. The force load 55 from the counter-pressure ring 54 is generated by a compression spring 64, which is supported between an edge of a peripheral flange 65 of the upper tool 31 and the abutting surface of a cutout 66 in the counter-pressure ring 54. The Ausschubposition of the counter-pressure ring 54 is determined by end stops. These consist in the present case of the head 67 of a family of guide rods 68 which are adjustable in length by threaded engagement 69 and a lock nut 71. The rod end 67 is supported at rest on the upper flank of the flange 65. As a result, the desired extension 70 of the counter-pressure ring 54 with respect to the upper tool 31 is determined.

In Fig. 6, as already mentioned, the upper reversal point of the lifting movement 37 is shown, where the upper tool 31 is opposite the lower tool 32 in the maximum stroke distance 38. Thereby, an eyelet 10 can be easily used on the receiving profile of the upper tool 31 and central insert 33. For this purpose, the upper tool 31 has a profile of the plate 11 corresponding receptacle 39. The area provided with the receptacle 39 is subject to wear under normal use. For ease of repair of a worn device 30, therefore, the lower portion of the upper tool is provided with an insert 31 ', the od by the indicated screw. Like. With the upper portion of the upper tool 31 is detachably connected. This insert 31 'has the receptacle 39.

After insertion of the eyelet 10, the end of the neck 20 is supported on the peripheral surface of the central insert 33 from. The central insert 33 is provided with a flat end surface 43. To secure the position of the Ösenteils in the tools 31, 33 is used in the peripheral region of the central insert 33 arranged holding element 44, which consists in the present case of a spring-loaded pin radially outward.

Between the two tool parts 31, 32, the carrier web 20 is inserted, which is initially unperforated. The above-mentioned springs 56 hold the pressure ring 34 in a defined, recognizable from Fig. 6 starting position At maximum stroke of the tools, the relevant top 45 of the pressure ring 34 is above or expediently at the same height with a provided cutting tool 32 cutting edge 42. This results in the pressure ring 34 a recognizable from Fig. 6 dash-dotted lines illustrated horizontal support plane 60 for the carrier web 20th

During the downward stroke 37 of the upper tool group 31, 33, 54, first the leading counterpressure ring 54 strikes the carrier web 20 lying above the pressure ring 34. The two rings 34, 54 are provided with ramps 58 and 59 extending essentially parallel to one another, which support web 20 between them, whereby the carrier web 20 is initially slightly tensioned. The inclined surface 58 of the pressure ring 34 extends at an acute angle 61 relative to the dot-dash line in Fig. 6 clarified support plane 60, which is determined by the serving for supporting the carrier web 20 end face 45 of the pressure ring 34. The counter-pressure surface 59 of the mentioned pressure ring 54 extends substantially parallel to the pressure surface 58. When Gegengegenfahren 37 of the two tools 31, 32, therefore, the carrier web 20 is pulled around the edge 62, which is formed between the end face 45 and the inclined surface 58 of the pressure ring 34. As a result, the carrier web is pulled smoothly in the region 29 to be punched. The carrier web 20 thus assumes an extended position in the mentioned support plane 60.

Then the loaded by the press ram central insert 33 hits the upwardly facing display side 23 of the carrier web 20 and presses against the resting on the support base 24 cutting edge 42 from the lower tool 32. As a result, a circular hole punched from the carrier web 20 is cut out. In this case, the hole radius 46 determined by the cutting edge 42 is smaller than the neck radius 26 of the eyelet neck 12 marked 26 in FIG. 6.

When the upper tool 31 continues to lower in the direction of the lifting arrow 37, the carrier web 20 is fixed between the two bevels 58, 59 of the clamped two rings 34, 54. The neck 12 moves from the eyelet 10 through the resulting hole in the lower tool until the plate 11 of the eyelet 10, with the interposition of the carrier web 20, touches the pressure ring 34. In this downward movement 37, the upper tool 31 overcomes the spring force 36 from the lower-side pressure ring 34 and there is the curling of eyelet neck 12 and the axial projections 16 on the flaring profile 47 of the lower tool 32. The spring force 54 from the upper-side pressure ring 54 is smaller than that on the Pressure ring 34 acting Ausschubkraft 36. Similar to the upper tool 31 and the lower tool 32 has a positioned in the axial region insert 32 ', which has the relevant flare 47. This hemming profile 47 wears out after prolonged use. Then it is sufficient only to replace this insert 32 '.

When flanging, the particular, apparent from Fig. 3 riveting arise. Virtually all of the neck length 48 of the eyelet part shown in FIG. 4 is rolled into a ring profile 50 recognizable from FIG. 3 on the back side 24 of the carrier web 20. The neck projections 16 are included in this ring formation 50. With the interposition of the mentioned and also indicated in Fig. 6 hole edge portion 21 of the carrier web 20, these neck projections 16 are pressed against a generated by the described curvature 13 of the plate 11 abutment surface 49. There comes to the recognizable from Fig. 3 annular peripheral Andruckstellen 40. In the inner ring profile 51, the carrier web 20 continues with an end zone 41 on, which adapts to the profile 50 like an annular segment. Even when rolling the end zone 41 during the riveting process, the bevels 58, 59 hold the carrier web 20 firmly.

During proper use of attached to the carrier web 20 Ösenteils arise by the force arrows 52 in Figs. 1 to 3 illustrated tensile loads. These tensile loads 52 are absorbed by the pressure points 40. At the pressure points 40 is initially a clamping action between the neck projections 16 and the abutment surface 49 before. In addition, because of the described profiling 19 of these projections 16 is also given a positive engagement. The tooth tips 17 penetrate into the web material, but because of the curves 27, 28 of the tooth profile 19, no cracking occurs in the web 20. A notch effect is thereby avoided. Before Tooth tips and also in the curved tooth spaces 18 created beyond these Andruckstellen 40 with a 53 in Fig. 3 designated step-like increase in the web thickness. The web 40 is namely at 53 anxious again to raise their original track thickness 25 itself. At the tensile loads 52 of the web 20, these step-like elevations 53 of the web material 20 dig into the wavy edges of the neck projections 16. As a result, the positive connection is increased and a surprisingly high tensile strength of the riveted eyelet 10 'on the web 20 is achieved.

List of reference numbers:

10

Eyelet (initial state, Fig. 4)

10 '

Rinse state of 10 (FIGS. 1 to 3)

11

Plate of 10

12

Neck of 10, eyelet neck

13

Arching profile of 11

14

arcuate transition between 11, 12

15

Tail of 12

16

axial neck protrusion at 15 (Figure 4)

17

Tooth tip (Fig. 5)

18

gap

19

Tooth profile at 15 (Figure 5)

20

support web

21

Hole edge area of 20

22

Hole in 20 (Fig. 1, 2)

23

Show side of 20

24

Back of 20

25

Web thickness of 20 (Figure 6)

26

Neck radius of 12 (Figure 6)

27

convex rounding of 17 (Fig. 5)

28

concave rounding of 18 (Figure 5)

29

Punch from 20 (Fig. 6)

30

contraption

31

Upper tool of 30

31 '

replaceable insert in 31

32

Bottom tool of 30

32 '

replaceable insert in 32

33

Central employment in 31

34

Pressure ring in 33

35

Force load arrow of 33

36

Arrow of the spring force of 34

37

Stroke movement arrow from 31 to 32 (FIG. 6)

38

maximum stroke distance between 31, 32

39

Recording in 31 for 11

40

Pressure location of 20 between 16, 49 (FIG. 3)

41

End zone of 20 beyond 40 (Figure 3)

42

Cutting edge at 32

43

flat face of 33 (Figure 6)

44

Retaining element for 10 at 33 (FIG. 6)

45

Face for 20 to 34

46

Hole radius of 29 (Figure 6)

47

Beading profile in 32 (FIG. 6)

48

Neck length of 12 (Fig. 4)

49

Abutment surface at 11 for 16 (FIG. 3)

50

Ring profile of 12 at 10 '(Figure 3)

51

Ring profile inside of 50 (Figure 4)

52

Arrow of the tensile load on 20

53

incremental increase of 20 past 40 (FIG. 3)

54

Counterpressure ring

55

Force load of 54

56

Spring for 36

57

Pin at 34 for 56

58

Slope of 34, bevel

59

Counter bevel of 54, counter bevel

60

support plane

61

Angular course of 58 opposite 45

62

Edge between 45, 58 of 34

63

Circumferential area of 31

64

compression spring

65

flange

66

neckline

67

Head of 68

68

guide rod

69

thread engagement

70

extension length

71

locknut

Claims (12)

1. Eyelet for reinforcing the area (21) around the edge of a hole (22) in a carrier web (20),

   - with a diskless eyelet part (10, 10'), consisting of a plate (11), which rests on the visible side (23) of the carrier web (20) during riveting, a tubular neck (12) which passes through the hole (22), and an arc-shaped transition area (14) between the plate (11) and the neck (12);

   - wherein, during riveting, the neck is flanged on the rear surface (24) of the carrier web (20) and the flanging of the neck (12) essentially comprises an inherently closed ring-shaped profile (50) into which virtually the entire length (48) of the neck is rolled,

   characterised in that
      the free end part (15) of the neck (12) is provided with projections (16), which extend in the axial direction before the riveting of the eyelet part (10) and are included in the ring-shaped profile (50) after the flanging,
      in that support surfaces (49) are formed inside the ring-shaped profile (51) by the convexity (13) of the plate (11) or transition area (14), against which the neck projections (16) are pressed, thereby intercalating the area (21) of the carrier web (20) around the edge of the hole, and produce compression points (40) on the gripped carrier web against which the carrier web bears under tensile stress,
      in that the neck projections (16) at the compression points (40) oppose the tensile stresses (52) exerted on the carrier web (20) during use and grip the carrier web (20), and
      in that, in the interior (51) of the ring-shaped profile, the end part (41) of the carrier web (20) extends beyond the flat compression points (40) to the edge of the hole and conforms to the shape of the ring-shaped profile (50) as a ring segment.
2. Eyelet according to claim 1, characterised in that the axial projections (16) on the neck consist of a pronged edge (19) at the end of the neck (12).
3. Eyelet according to claim 2, characterised in that the tips (17) of the prongs are convexly rounded, in that the gaps (18) between the prongs are concavely rounded, and
      in that the two rounded areas (27, 28) define a wave-like course of the pronged edge (19).
4. Eyelet according to claim 3, characterised in that the pronged edge (19) is asymmetrically wave-like.
5. Eyelet according to claim 3 or 4, characterised in that the convexly rounded areas (27) of the prong tips (17) are smaller than the concavely rounded areas (28) of the prong gaps (18).
6. Eyelet according to one of claims 1 to 5, characterised in that the material of the carrier web (20) is flexible and/or stretchable.
7. Eyelet according to claim 6, characterised in that the carrier web (20) consists of a canvas tarpaulin.
8. Eyelet according to claim 6, characterised in that the carrier web (20) consists of a reinforced plastic sheet.
9. Device (30) for installing eyelet parts (10) in a carrier web (20) according to one of claims 1 to 8,
      with a lower tool (32), which comprises the flanging profile (47) for the neck (12) of the eyelet part (10) and which also has a ring-shaped cutting edge (42);
      with an upper tool (31), which holds the eyelet part (10), can move up and down (37) relative to the lower tool (32), and has a central insert (33), which is able to move in the axial direction against spring force (35);
      where the carrier web (20) is positioned between the two tools (31, 32), and the cutting edge (42) of the lower tool (32) works with the end surface (43) of the central insert (33) to perform a hole-cutting action (29) on the carrier web (20) situated between them;
      with a thrust ring (34) in the lower tool (32), which is located a certain radial distance away from the flanging profile (47) and is subjected to a force (36) directed toward the upper tool (31);
      where the radius (46) of the hole of the cutting edge (42) is smaller than the outside radius (26) of the neck (12) of the eyelet part (10),
   characterised in that
      the end surface (43) of the central insert (33) is essentially flat and free of pretensioning pins which prestretch the carrier web (20);
      in that, at the point of maximum stroke between the two tools (31, 32), the thrust ring (34) is located essentially on the same level as the cutting edge (42) of the lower tool (32) and together with the cutting edge (42) forms a support plane (60) for the carrier web (20) to be placed between the two tools (31,32);
      in that a counter-thrust ring (54) in the upper tool (31) is associated with the thrust ring (34) and is subject to a force (55) directed toward the lower tool (32); and
      in that the carrier web (20) is tensioned between the two rings (34, 54) during the stroke movement (37).
10. Device according to claim 9, characterised in that the two rings (34, 54) are provided with two opposing bevelled surfaces (58, 59), which face each other, and which tension the carrier web (20) between them during the working stroke of the tools (31, 32).
11. Device according to claim 10, characterised in that the bevelled surface (58) and the support plane (60) form an acute angle (61) pointing in the direction (37) of the stroke, the support plane being determined by the support surface (45) of the thrust ring (34); and
       in that the opposing bevelled surface (59) of the counter-thrust ring (54) is essentially parallel to the bevelled surface (58) of the thrust ring (34).
12. Device according to one of claims 9-11, characterised in that a helical compression spring has a ring-shaped end surface, and
       in that this terminal ring-shaped surface forms the thrust ring (34), while the compression spring produces the force (36).