GB2069895A - Flanging by rolls - Google Patents

Abstract

A method and apparatus for forming a folded edge in an elongated flat strip (12) of material comprising a supporting structure (14), a plurality of edge forming rollers (46, 48 etc.) arranged at spaced intervals along a path, said rollers being adapted to impart a shaped edge in an elongated edge of said strip as it is passed along said path, and a feed guide (16, 17) for guiding the strip (12) in a vertical disposition along said path with a vertically disposed flat surface of said strip adjacent said elongated edge. The guide 17 may comprise a felt pad 40. <IMAGE>

Description

SPECIFICATION Method and apparatus for shaping a strip This invention relates to the shaping of a generally flat material to produce a fold in one edge; more especially the invention is concerned with the shaping of sheet metal or the like into building panels.

Panels made from aluminium or galvanized steel sheet material are widely employed in the building trade. Such panels, which are frequently painted, are employed to simulate wood panels.

Panels of this general type include siding panels and fascia panels.

Siding panels are disposed in a horizontal manner on the outside walls of frame buildings to form the exposed surface of the building and are typically nailed to vertical studs with or without intervening sheathing.

Fascia panels are employed under the eaves or cornice.

Such panels are usually made by feeding a strip of sheet material through a series of edge forming or shaping roller means. Each roller means comprises an upper roll and a lower roll which coact to engage the edge of the moving strip and impart a characteristic bend in the edge of the strip as part of the total shaping operation, so that when the strip has passed through all the roller means, the strip emerges with the desired fold along its edge.

The strip is fed from a coil horizontally through the roller means.

A machine of this general character is described in Canadian Patent 983,366 of Gary A.

Knudson. This machine is designed to form two operations, however, it can be employed solely to produce a shaped edge in an elongated strip, in which case the group A rollers described in the patent are employed alone, the group B rollers being disengaged.

Such a machine is employed at the site of the building on which the panels are being applied.

The panelling is produced in a continual manner and cut, as it emerges from the machine, to the desired lengths to fit the building. Thus the machine is usually transported from site to site in a trailer and it is highly desirable to provide a compact portable machine that can be operated without special training or skill.

A particular problem with the machine described in the Canadian Patent resides in the mounting of the coil of sheet material for horizontal feeding through the shaping rollers.

In the embodiment described, and illustrated in Figure 1, of the patent, the coil is mounted for rotation above the machine. This presents some problems since such a coil of aluminium may typically weigh about 380 to 400 Ibs and a coil of galvanized steel weighs still more. In view of this it is necessary to employ a hoist to lift and mount the coil above the machine. If the coil is improperly placed or falls during mounting it may produce extensive and expensive damage to the machine parts below.

Although not shown in Figure 1 of the aforementioned Canadian Patent, the commercial embodiment of the machine has a heavy upper supporting frame, extending the length of the machine, to support a hoist for lifting and mounting a coil above the machine. This considerably increases the size and cost of the machine, and necessitates a large trailer to house the machine.

The present invention has for an object the provision of a machine, which is both compact and portable, for forming a folded edge in an elongated strip of material; and especially for forming metal panels for buildings.

It is a further object of the invention to provide such a machine in which the necessity of mounting a coil of the sheet material is avoided, as are the structure and equipment for lifting, mounting and supporting the coil above the machine.

It is a still further object of the invention to provide such a machine which enables the use of a simple turntable to mount a coil of the sheet material, for feeding into the machine.

Another object of the invention is to provide a novel method of forming a folded edge in an elongated strip of material; and especially of forming metal building panels.

Broadly the invention comprises, in one aspect, an apparatus for forming a folded edge in an elongated strip of material, including a supporting structure, a plurality of edge forming roller means mounted in said supporting structure at spaced intervals along a path, and means for guiding an elongated strip of material, in a vertical disposition along said path.

In another aspect of the invention, broadly stated, there is provided a method of forming a folded edge in an elongated strip of material, wherein the material is passed along a path in a vertically disposed manner, through a plurality of spaced apart edge forming roller means.

The successive roller means impart a characteristic bend or fold in an elongated edge of the strip to provide a total shaping operation, whereby there can be continuously or continually produced an elongated strip having a desired fold along an elongated edge.

In particular the folded edge is formed in a flat strip of the material and the roller means is adapted to progressively impart a shaped edge in an elongated edge of the strip as the strip is passed along the path, the strip being guided with a vertically disposed flat surface of the strip adjacent the elongated edge.

It is especially preferred to guide the strip by means of an elongated stationary support surface mounted in the supporting structure and extending adjacent the path. In particular the support surface may comprise a supported pad which is effective to prevent flexing of the strip during passage through the apparatus. This is important because flexing of the strip can produce buckling and rippling in the strip which may be unacceptable in the final product, and this is particularly so when the product is fascia, siding or other building panels.

A felt pad has been found to be especially useful in preventing flexing, whereby such buckling and rippling in the strip are avoided.

It will be understood that the reference to the strip being vertically disposed or in a vertical disposition is intended to indicate that the major flat surfaces of the strip lie in a vertical plane, as distinct from a horizontally disposed strip in which the major flat surfaces lie in a horizontal plane, as in the aforementioned Canadian Patent.

In another embodiment of the invention means are provided to successively form a fold in a second elongated edge in the strip opposed to the first mentioned edge, during the operation of forming the fold in the first edge.

The invention is especially concerned with an apparatus and method for conveniently and economically producing fascia, siding, other building panels and similar articles.

The invention is illustrated in a particular embodiment by way of example only by reference to the accompanying drawings in which: Figure 1 is an isomeric view of the entry end of a machine of the invention about to be fed with an elongated strip of sheet material, Figure 2 is an elevation view of the machine of Figure 1 as viewed from the rear of the view shown in Figure 1, Figure 3 is a top plan view of the machine, shown in Figure 2, Figure 4 illustrates schematically the drive means for the rollers and the vertical adjustability of the upper rollers, Figure 5 illustrates schematically a detail of roller station A as an end elevation, Figure 6 illustrates schematically a detail of roller station B in an isometric view, Figure 7 illustrates schematically the successive bends or folds formed in the vertically disposed elongated strip, employing the machine of Figure 1, as it is fed from a coil, Figure 8 illustrates schematically a detail of a turntable mounting the coil shown in Figure 7, Figure 9 illustrates schematically the operation of the first roller means of the sequence, in the machine of Figure 1, Figure 10 illustrates schematically the operation of the second roller means of the sequence, in the machine of Figure 1, Figure 11 illustrates schematically the operation of the third roller means of the sequence, in the machine of Figure 1, Figure 12 illustrates schematically the operation of the fourth roller means of the sequence, in the machine of Figure 1, Figure 13 illustrates schematically the operation of the fifth roller means of the sequence, Figure 14 illustrates schematically the operation of the sixth roller means of the sequence, Figure 15 illustrates schematically a front elevation of a device for mounting in the machine of Figures 1, 2 and 3 for forming a fold in a second elongated edge of the sheet material, Figure 16 illustrates a plan view of Figure 15; and Figures 17a, 17b and 1 7c show side views of successive folding elements of the device of Figures 15 and 16.

With further reference to the drawings, and in particular Figures 1,2 and 3 there is shown a machine 10 for forming a folded edge in a strip 12 to produce fascia.

The machine 10 comprises a supporting frame 14, a feed guide 16, a support surface 17, roller stations A, B, C, D, E and F in a spaced apart arrangement, chain drive means 30, a drive shaft 32 and a motor 33.

The supporting frame 14 comprises a base 34, a vertical support member 38 at the entry end and spaced apart vertical support members 43, all mounted on base 34. An elongated horizontal support member 41 is mounted on members 43 and a vertical support member 39 is mounted on horizontal support member 41 adjacent the entry end of the machine.

The feed guide 16 includes an upper guide-bar 35 mounted on support members 38 and 39, and a lower guide-bar 36 mounted on support member 38. Guide rollers 37 are rotatably mounted in the guide-bars 35 and 36.

support surface 17 includes an elongated felt pad 40 mounted on an inwardly facing surface of horizontal support member 41.

Each of roller stations A, B, C, D, E and F includes an upper roller and a lower roller designated 46 and 48; 50 and 51; 52 and 53; 54 and 56; 58 and 60; and 62 and 64 respectively.

Upper roller 46 of roller station A is mounted for rotation on the drive shaft 32. Upper rollers 50, 52, 54, 58 and 62 are rotatably mounted on central rotary support shafts 66 while lower rollers 48, 51, 53, 56, 60 and 64 are rotatably mounted on central rotary support shafts 68.

Each roller station further comprises an upstanding roller support 70 in which the shafts 32, 66 and 68 are rotatably mounted.

Chain drive means 30 includes a continuous chain 72 mounted between drive shaft 32 and support shaft 66 of roller station B; and additional continuous chains 72 mounted between the adjacent support shafts 66 of stations B and C; C and D; D and E; and E and F.

With further reference to Figures 5 and 6 there are shown details of roller stations A and B respectively. With particular reference to Figure 6, an outer continuous chain 72, which is disposed between stations B and C, comprises a plurality of connected links 74, which engage teeth 76 in a toothed ring 78 mounted on the end of shaft 66. A second continuous chain 72 is shown inwardly of the aforementioned chain 72, and is similarly connected to drive shaft 32 of station A (the second toothed ring on shaft 66 in Figure 6 is not shown).

Each roller support 70 includes an upper casing 80 which mates with a lower casing 82. A generally rectangular cavity 84 is defined between the casings 80 and 82. A generally rectangular block 86 is mounted in cavity 84 by means of a screw 88 engaging a threaded bore 90 in the upper casing 80, the screw 88 being keyed in block 86.

A vertically upright elongated pin 92 is mounted between an arcuate slot 94 in block 86 and an arcuate slot 96 in an inner wall of cavity 84 in lower casing 82.

With further reference to Figures 7 and 8 there is shown a convenient and simple means for the feeding of strip 12 in a vertical disposition as shown in Figures 1 and 2.

With reference to Figure 7 there is shown a coil 98 of the material of strip 12 mounted on a turntable 100.

As shown in Figure 8 the turntable 100 includes a platform 102 to support the coil 100. A shaft 106 extends downwardly from platform 2 and is mounted for rotation in a bearing 108 supported on a base 104.

With further reference to Figures 9 to 14 there is shown the successive bends or folds produced in a lower elongated edge of the strip 12 as it passes between the rollers of roller stations A to F.

The folds or bends are further illustrated in a simplified manner in Figure 7.

By reference to Figures 4 and 6 it will be seen that the upper shaft 66 of each of roller stations B to F, and the drive shaft 32 of roller station A may be raised or lowered by turning the screw 88 to move block 86 upwardly or downwardly in cavity 84 of the roller support 70. In this way the separation of the upper and lower rollers of each roller station can be adjusted to accommodate different thicknesses of strip 12.

With further reference to Figures 15 and 16, a device 110 comprises a frame 112 including a pair of spaced apart legs 114 and 116, an elongated horizontal bar 118 and mounting elements 120, 122 and 124.

Folding elements 126, 128 and 130 are mounted on the underside of elements 120, 122 and 124 respectively.

With further reference to Figure 17a, the folding element 126 comprises an angle member 132 secured by bolts 134 to the underside of mounting element 120. A pair of spaced apart rollers 136 and 138 rotatably mounted on roller shafts 136a and 138a. These axes of rollers 136a and 138a are disposed at an angle of about 600 to the horizontal.

Folding elements 128 and 130 illustrated in Figures 1 7b and 17c are of similar form, the axes of rollers 144 and 146 in Figure 17b being disposed at an angle of about 300 to the horizontal, and the axis of rollers 152 and 154 in Figure 1 7c being disposed parallel to the horizontal. The device 110 is suitably mounted by means of legs 114 and 116 on an upper surface of support member 41 shown in Figure 1, so that an upper elongated edge of strip 12 is engaged successively by the rollers of folding elements 126, 128 and 130 as strip 12 is fed through machine 10.

The device 110 can be mounted on support member so as to produce a fold in the upper edge of strip 12 on the same side of strip 12 as the fold formed along the lower edge or it can be turned through 1 800 so that the fold formed along the upper edge of strip 12 extends on the opposite side of strip 12 from the fold along the lower edge.

In operation, and before the motor 33 is switched on, the drive shaft 32 of roller station A and the shafts 66 of stations B to F are initially raised by means of their respective screws 88, whereby the upper rollers 46, 50, 52, 54, 58 and 62 are lifted clear from the lower rollers 48, 51, 53, 56, 60 and 64 respectively.

The end of strip 12 is fed between the guide rollers 37 of the upper and lower guide-bars 35 and 36. This is done manually and causes the platform 102 of turntable 100 to rotate, whereby strip 12 is drawn from coil 98.

The strip 12 is fed between the upper and lower rollers of each of roller stations A to F. The screws 88 are adjusted to move the upper rollers of each of stations A to F downwardly so that the lower elongated edge of strip 12 is engaged between the upper and lower rollers of each of the roller stations A to F. The screws 88 should not be tightened, since undue pressure of the rollers on the strip 12 will mar the surface of the strip 12 and may cause cracks in a painted coating on the strip 12, or indeed in the metal. The strip 12 when seated between the upper and lower rollers is maintained in its vertical upright position by the felt pad 40 with which it is in contact (see Figures 9 to 14). The felt pad 40 prevents flexing of the strip 12 so that buckling and ripples are avoided during the subsequent passage of the strip 12 through the machine 10.

The motor 33 is switched on and this drives the drive shaft 32, which drives the shafts 66 of roller stations B to F, by means of the chain drive means 30.

In this way the upper roller of each of roller stations A to F is caused to rotate. The engagement of the upper rollers with the strip 12, and the engagement of the strip 12 with the lower rollers of each of roller stations A to F, is such that the lower rollers are caused to rotate in a direction opposite to the direction of rotation of the upper rollers and the strip 12 is drawn through the machine, through the rollers of the successive roller stations A to F.

A folding or bending operation is carried out at each roller station as illustrated in Figures 9 to 14, and the strip 12 emerges from roller station F with the completed fold along its lower edge.

The disposition of the rollers in the roller stations A to F is such as to define a substantially straight path for the strip 12.

The straight path in conjunction with the support provided by felt pad 40, which ensures that the strip 12 is maintained in a vertical position, avoids undue bending of the strip 1 2 which might cause buckles and which would necessitate discarding of lengths of the strip 12.

The motor 33 can be switched off at will by the operator so as to cut desired lengths of the folded strip emerging from the machine 10.

The machine 10 is simple in structure and compact and can be moved from place to place on a small trolley mounted on wheels. The turntable 100, likewise provides a simple means for feeding of the strip into the machine 1 0 and avoids the necessity of hoists to lift the coil 98 above the machine, and of space consuming upper supporting structure to mount the coil above the machine as in the aforementioned Canadian Patent 983,366.

The position of upper guide-bar 35, mounted on vertical support members 38 and 39 is vertically adjustable whereby the separation of the upper and lower guide-bars 35 and 36, respectively can be adjusted to accommodate strips of different widths.

The vertical adjustability of the upper rollers of roller stations A to F permits adjustment in the separation of the upper and lower rollers to accommodate strips of different thicknesses.

The ability to modify the machine 10, by simple adjustment, to accommodate strips of different widths and thicknesses renders the machine 10 highly flexible in use and effects significant advantages over the conventional machines.

The necessary adjustment of the upper rollers df stations A to F to accommodate the strip 12 is readily determined by trial. The upper and lower rollers of each of roller stations A to F, in operation, frictionally engage the opposed flat surface of the strip 12 adjacent the lower elongated edge. The frictional engagement need only be that necessary for the rotating rollers to draw the strip 12 through the stations A to F.

It will be understood, in connection with Figure 6, that a second vertically upright elongated pin 92 is mounted between arcuate slots 94 and 96 in the side of the block 94 opposed to that visible in Figure 6.

In the operation of device 110 which is optionally included, the device is suitably mounted on support member 41 adjacent the exit end of the machine 10. As the strip 12 is fed between the upper and lower rollers of roller stations A to F, the upper elongated edge of strip 12 is engaged between the freely rotatable rollers 136 and 138 of folding element 126 and subsequently between rollers 144 and 146 of element 128, and rollers 1 52 and 1 54 of element 130, so that a fold is progressively imparted in the upper elongated edge of strip 12.

The device 110 is suitably located such that the elongated upper edge of strip 12 is subjected to the folding operation while the lower elongated edge is being subjected to folding operations in roller stations E and F or D, E and F.

The machine 10 is compact and can be moved easily from site to site; it can be manufactured inexpensively, and there is ready access to all parts of the machine; this is to be contrasted with the rather complex arrangement as described in the aforementioned Canadian Patent.

The invention has been described in particular by reference to a machine for producing fascia, however, it will be understood that other building panels and similar articles can be produced within the invention. Different roller stations can be employed to impart different folds in the production of such panels and similar articles, particularly from aluminium or building steel, for example, galvanized steel.

Claims (25)

1. An apparatus for forming a folded edge in an elongated, flat strip of material comprising: a supporting structure, a plurality of edge forming roller means mounted in said supporting structure at spaced intervals along a path, said roller means being adapted to progressively impart a shaped edge in an elongated edge of said strip as said strip is passed along said path; and means for guiding said elongated strip in a vertical disposition along said path with a vertically disposed flat surface of said strip adjacent said elongated edge.

2. Apparatus according to claim 1 , wherein said means for guiding comprises an elongated stationary support surface mounted on said structure, extending adjacent said path and adapted to supportingly contact said vertically disposed flat surface of said strip and maintain it in said vertical disposition; said path defining a straight line.

3. Apparatus according to claim 2, wherein said support surface comprises a supported felt pad effective to prevent flexing of the strip, whereby buckling and rippling in the strip are avoided.

4. Apparatus according to claim 2, wherein said means for guiding further includes upper and lower roller guide means mounted on said structure, adapted to engage upper and lower elongated edges of the vertically disposed strip, for feeding said strip to said roller means.

5. An apparatus for forming building panelling from an elongated strip of metal sheet material comprising a supporting structure, a plurality of aligned edge forming roller means mounted in said structure at spaced intervals, each roller means comprising an upper roller connected to drive means and a lower, freely rotatable, roller, a straight path for a vertically disposed elongated strip of sheet material being defined between the upper and lower rollers of said plurality, said roller means being adapted to progressively impart a shaped edge in a lower elongated edge of said strip, as said strip is passed along said path between upper and lower rollers of successive roller means, guide means for guiding said strip in a vertical disposition along said path including an elongated stationary support surface mounted in said structure, extending adjacent said path and adapted to supportingly contact a vertically disposed flat surface of said strip and maintain it in a vertical disposition, and upper and lower roller guide means mounted in said structure adapted to engage upper and lower elongated edges of the vertically disposed strip, for feeding the strip to the roller means along said path.

6. Apparatus according to claim 5, wherein each upper roller is mounted in said structure for independent vertical movement whereby separation of the upper and lower rollers can be adjusted to accommodate strips of different thickness.

7. Apparatus according to claim 6, wherein each of said upper rollers is mounted on a supporting shaft, and including a motor operatively connected to directly rotate the supporting shaft of one of said upper rollers, a plurality of continuous drive chains, each drive chain operatively connecting a pair of adjacent supporting shafts of adjacent upper rollers, whereby rotation of the supporting shaft of said one upper roller effects rotation of the other upper rollers.

8. Apparatus according to claim 7, wherein each said roller means is rotatably mounted in a roller support, each said upper roller being mounted in a vertically moveable block in said roller support.

9. Apparatus according to claim 5, 6 or 7, wherein at least one of said roller guide means is vertically adjustable whereby the separation of said roller guide means can be adjusted to accommodate strips of different widths.

10. Apparatus according to claim 5, 6 or 7, in combination with a turntable adapted to support a strip of sheet material wound in a coil for feeding said strip in a vertical disposition to said upper and lower roller guide means.

11. An apparatus for forming a folded edge in an elongated strip of metal sheet material comprising a supporting structure, a plurality of aligned edge forming roller means mounted in said structure at spaced intervals, each roller means comprising an upper roller and a lower roller, a straight path for a vertically disposed elongated strip of sheet material being defined between the upper and lower rollers of said plurality, said roller means being adapted to progressively impart a shaped edge in a lower elongated edge of said strip, as said strip is passed along said path between upper and lower rollers of successive roller means, guide means for guiding said strip in a vertical disposition along said path including an elongated stationary support surface mounted in said structure, extending adjacent said path and adapted to supportingly contact a vertically disposed flat surface of said strip and maintain it in a vertical disposition, and guide means mounted in said structure adapted to engage upper and lower elongated edges of the vertically disposed strip for feeding the strip to the roller means along said path.

12. An apparatus for forming a folded edge in an elongated strip of material comprising: a supporting structure, a plurality of edge forming roller means mounted in said supporting structure at spaced intervals along a path, and guiding means for guiding said elongated strip in a vertical disposition along said path, said guiding means comprising an elongated stationary support surface comprising a supported felt pad mounted on said structure, and extending adjacent said path, said supported felt pad being adapted to supportingly contact a vertically disposed flat surface of said strip to prevent flexing of the strip whereby buckling and ripples in the strip are avoided and said vertical disposition is maintained.

13. An apparatus according to claim 1,3 or 5, further including a second plurality of edge forming rollers mounted at spaced intervals along said path, said second plurality being adapted to progressively impart a shaped edge in a second elongated edge of said strip opposite the first edge.

14. An apparatus according to claim 11 or 12, further including a second plurality of edge forming rollers mounted at spaced intervals along said path, said second plurality being adapted to progressively impart a shaped edge in a second elongated edge of said strip opposite the first edge.

1 5. A method of forming a folded edge in an elongated strip of material comprising: passing the strip in a vertically disposed manner along a path, and progressively imparting a fold in an elongated edge of said strip in said path, while maintaining a flat surface of said strip adjacent said elongated edge, vertically disposed.

16. A method according to claim 15, including supportingly contacting said flat surface with a stationary supported felt pad extending adjacent said path to prevent flexing of the strip whereby buckling and ripples in the strip are avoided, and withdrawing a strip having a fold in an elongated edge and a flat surface free of buckles and ripples adjacent the folded edge.

17. A method according to claim 16, wherein said fold is progressively imparted in said elongated edge by a plurality of spaced apart edge forming roller means along said path, comprising frictionally engaging said elongated edge with said roller means, and drawing said strip along said path by rotation of the rollers of said roller means, the fold being progressively imparted as the strip is drawn along said path between rollers of successive roller means.

18. A method according to claim 17, wherein said path defines a straight line.

19. A method according to claim 1 5, 16 or 18.

which further comprises progressively imparting a fold in a second elongated edge of the strip in said path, opposite the first elongated edge.

20. An apparatus for forming a folded edge in an elongated, flat strip of material comprising: a supporting structure, a plurality of edge forming roller means mounted in said supporting structure at spaced intervals along a straight path, said roller means being adapted to progressively impart a shaped edge in an elongated edge of said strip as said strip is passed along said path; and means for guiding said elongated strip in a vertical disposition along said path with a vertically disposed flat surface of said strip adjacent said elongated edge; said means for guiding comprising an elongated support surface extending adjacent said path and adapted to supportingly contact said vertically disposed flat surface of said strip and maintain it in said vertical disposition.

21. An apparatus for forming a folded edge in an elongated, flat strip of material comprising: a supporting structure, a plurality of edge forming roller means mounted in said supporting structure at spaced intervals along a path, said roller means being adapted to progressively impart a shaped edge in an elongated edge of said strip as said strip is passed along said path; and means for guiding said elongated strip in a vertical disposition along said path with a vertically disposed flat surface of said strip adjacent said elongated edge, said means for guiding comprising an elongated stationary support surface mounted on said structure, extending adjacent said path and adapted to supportingly contact said vertically disposed flat surface of said strip and maintain it in said vertical disposition; said path defining a straight line.

22. A method of forming a folded edge in an elongated strip of material comprising: passing the strip in a vertically disposed manner along a path, and progressively imparting a fold in an elongated edge of said strip in said path, while maintaining a flat surface of said strip adjacent said elongated edge vertically disposed, including supportingly contacting said flat surface with an elongated support surface extending adjacent said path to prevent flexing of the strip whereby buckling and ripples in the strip are avoided, and withdrawing a strip having a fold in an elongated edge and a flat surface free of buckles and ripples adjacent the folded edge.

23. A method of forming a folded edge in an elongated strip of material comprising: passing the strip in a vertically disposed manner along a path, and progressively imparting a fold in an elongated edge of said strip in said path, while maintaining a flat surface of said strip adjacent said elongated edge vertically disposed, including supportingly contacting said flat surface with a stationary supported felt pad extending adjacent said path to prevent flexing of the strip whereby buckling and ripples in the strip are avoided, and withdrawing a strip having a fold in an elongated edge and a flat surface free of buckles and ripples adjacent the folded edge.

24. Apparatus for forming a folded edge in an elongated flat strip of material substantially as herein described with reference to the accompanying drawings.

25. A method for forming a folded edge in an elongated flat strip of material substantially as herein described with reference to the accompanying drawings.