GB1591887A - Machine for expanding metal webs - Google Patents
Machine for expanding metal webs Download PDFInfo
- Publication number
- GB1591887A GB1591887A GB1246580A GB1246580A GB1591887A GB 1591887 A GB1591887 A GB 1591887A GB 1246580 A GB1246580 A GB 1246580A GB 1246580 A GB1246580 A GB 1246580A GB 1591887 A GB1591887 A GB 1591887A
- Authority
- GB
- United Kingdom
- Prior art keywords
- web
- expander
- arms
- arm
- expanded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D31/00—Other methods for working sheet metal, metal tubes, metal profiles
- B21D31/04—Expanding other than provided for in groups B21D1/00 - B21D28/00, e.g. for making expanded metal
Description
(54) MACHINE FOR EXPANDING METAL WEBS (71) We, EXPLOSIVE S.A., a Swiss body corporate of 11, Rue d'Italie, P.O.
Box 228, 1211 Geneva 3, Swizerland, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is la be performed, to be particularly described in and by the following statement:- The present invention relates to improvements in expander machines for forming open-mesh expanded material from webs which have beforehand been slit on a rotary slitting machine so as to provide them with an array of parallel discontinuous slit lines. The machine described in the present application is also described in our patent applications no's 36391/76 and 36392/76 (Serial No. 1591886) (cognate) from which the present application is divided. More especially, the machine is intended for production of expanded aluminium meshes for use as anti-explosive fillings such as are described in British patent no. 1,131,687 dated October 18, 1966, in the name of
Joseph Szego, although it may be employed in the production of other kinds of expanded materials.
A known form of expander machine for expanding rotary slit webs comprises a pair of expander arms with vertically and horizontally diverging edges along which the slit web is passed, the web slipping laterally over the diverging edges and being spread therebetween so as to open the slits in the web out into diamond-shaped meshes. The known form of machine is, however, subject to numerous disadvantages which we have now overcome and these are described in greater detail hereinafter.
According to the present invention there is provided a machine for expanding metal webs comprising a pair of expander arms with vertically and horizontally diverging edges along which a slit web is passed forwardly, the web slipping laterally over the diverging edges and being spread therebetween so as to open the slits in the web out into diamond-shaped meshes, the surface of each expander arm on which the web is to be supported and over which the web slips
being smooth-surfaced at least in a region
extending forwardly from the rear of the
arm and over a major part of its length, and
wherein the web is conveyed by being grip
ped at each edge between the smooth sur
face of the expander arm and a driven end
less belt which runs along the expander arm
and is pressed towards the smooth surface.
We have found that this gripping
arrangement efficiently and reliably retains
the edges of the web, and is particularly use
ful when expanding metal webs in the form
of thin foils such as the foils of five to twelve
thousandths of an inch thickness that we
describe in our above-mentioned patent
application. Moreover, the belts can accommodate metal webs of varying widths.
An expander machine in accordance with the present invention will now be more fully described, by way of example only, with reference to the accompanying drawings in which:
Figure 1 shows a perspective view of an expander machine;
Figure 2 shows in more detail the drive mechanism for the web-conveying endless belts of the machine of Figure 1;
Figure 3 shows a cross-section through the expander arms taken in the line 3-3 of
Figure 1;
Figure 4 shows a support for the endless belt at the output end of the expander arm, partly in section on the line 4-4 of Figure 1;
Figure 5 shows in plan an adjustment for the expander arms;
Figure 5a shows a transverse section on the line 5a-5a of Figure 5;
Figure 6 is a fragmentary view of the expander arm;
Figure 7 shows the support arrangement for the endless belts and the expander arms at the input side of the machine, partly in section on the line 7-7 of Figure 1;
Figure 8 is a view similar to Figure 7 showing the outer side of the upper expander arm on the line 8-8 of Figure 1;
Figure 9 shows a view from the rear of the expander arms along the line 9-9 of Figure 1;
Figure 10 is a vertical section through the main frame and sub-frame of the machine taken on the line 10-10 of Figure 1 Figure 1 1 shows a side view of the coil stock holder of the machine viewed on the arrow A in Figure 1; Figure 12 shows in detail the slippage of slit foil over the inclined edge of the expander arms.
Referring to the drawings, the machine comprises a main frame 20, and a sub-frame 21 pivoting on the main frame about horizontal axis 22. At one end, the frame 20 carries an upright 23 in which horizontal shaft 24 of the sub-frame pivots freely within a bearing 26. At this end, the subframe 21 is defined by a plate 27 to which shaft 24 is connected.
The opposite end of the sub-frame is constituted by a generally D-shaped mounting portion 28 (also shown in Fig. 10) connected to the end plate 27 by a pair of vertically spaced horizontal tie rods 9.
The mounting portion 28 of the subframe is supported at one side on a vertical extension 31 of the main frame 20 by a locking bolt 32 for clamping the mounting portion 28 to a projection 33 of extension 31.
The locking bolt 32 enters an arcuate slot 34 in the projection 33.
At its lower end, the mounting portion 28 has an arcuate raised key 36 sliding in a curved key way channel 37 secured on the main frame 20. The centre of curvature of the key way channel 37 and of the slot 34 is arranged coaxial with shaft 24, so that the whole sub-frame 21 may be rotated about this axis.
For tilting the sub-frame about this horizontal axis, a hand wheel 38 is provided on a threaded shaft 39 engaging a threaded sleeve coupled to a portion 28 through a pivotal coupling 42.
A holder for a coil of slit metal stock has side plates 43, and front and rear tie bars 44 and 46 of which the front bar 44 slides at its ends in bearing 47 on the main frame 20.
The rear bar 46 has a key block 48 sliding in a horizontal channel key guide way 49 connected on the frame 20, so that the whole holder may be shifted laterally. Blocks 51 are connected on the side plates 43, carrying bearings 52 through which passes a shaft 53 around which the coil stock is wound. The blocks 51 have hinged sections 54 releasably held in place by clamping screws 56 allowing the shaft 53 to be lifted from the machine when fresh coil stock is to be placed in the holder.
For keeping the feed of the slit web stock 58 in proper alignment, a pair of edge detectors 59 are mounted on frame 20 adjacent the feed of the web. These control the operation of an hydraulic cylinder 60 connected between frame 20 and one side plate 43 of the holder and shift the holder laterally in response to signals from the edge detectors 59, so that the slit metal web 58 is maintained in alignment with the horizontal axis of sub-frame 21.
The shaft 53 of the coil stock holder is provided with a brake to keep tension in the web and to prevent over-feeding. A brake drum 66 on one side plate 43 has a friction band 67 passing over it and is fixed at one end to the plate 43. The other end of the band 67 carries a weight 68 holding it in frictional engagement with the drum 66.
The drum 66 connects to the shaft 53 through a shaft 64, a gear 63, and an upper gear 62.
The plates 43 also carry posts 69 which support a roller 71 over which the web passes towards the sub-frame 21.
The form of coil stock holder employed is separable as a distinct unit from the remainder of the machine. This facilitates the change-over procedure if fresh coil stock is to be substituted, and may enable the coil stock holder to be employed for reeling up slit foil supplied from a metal slitting machine. In Figure 1, the main frame 20 is divided in two halves 20a and 20b separable along a joint 72. A latch 73 serves to retain the frame parts releasably together.
From the holder, the web 58 passes beneath a roller 74 journalled at one end in a bearing 76 on end plate 27 and at the other end in an extension of the D-shaped mounting portion 28. The web 58 then pas ses to a smooth circular section bar 77 nonrotatably secured to end supports 78 connected on the tie rods 29. The axis of the bar 77 is parallel to the plane of the web at a region 79 where it subsequently approaches a pair of diverging expander arms 81 and 82. The upper surface of the bar 77 is aligned with the rear end edges of the arms 81 and 82 and its axis is inclined with respect to the direction of travel of the web along the expander arms 81 and 82, so as to redirect the web from its initial direction of lateral feed from the coil stock holder, to the arms 81 and 82. In the present instance, where the coil stock holder and the expander arms 81 and 82 are arranged perpendicular to one another, the axis of the bar 77 is inclined at 45C to the final direction of travel along the arms 81 and 82.
We have found that if a roller is used instead of the non-rotatable bar 77, the web tends to creep upwardly along the roller, rcsulting in misaligned delivery of the web.
The mounting portion 28 of the sub-frame 21 has a pair of supporting side plates 210 that are attached directly to the mounting portion 28.
Each plate 210 has a right-angled lower rear extension 221, through which the plates 210 are bolted on the mounting portion 28 with bolts 222. The plates 210 are braced on the outer sides by triangular fillets 223. The upper parts of the plates 210 are connected by a cylindrical cross brace 224, and the lower parts by a rectangular channel section cross brace 226.
The upper of the two rubber-covered rollers 87 is vertically slidably mounted on the plates 210, and a control bar 225 extending between the plates 210 serves to control upward and downward shifting of the upper roller. The bar 225 is rotatable mounted in each plate 210 and at each end carries an eccentric pin connected to the mounting of the upper roller, whereby when the bar 225 is rotated, the upper roller 87 can be shifted upwardly so as to be separated from the lower roller to facilitate threading the web 58 into the machine and can thereafter be closed up again to grip the web firmly. An operating handle 225a is connected on the bar 225 for rotating the bar 225.
Forwardly of the rollers 87, the web 58 is supported between and guided by a pair of guide plates 227 and 228, best seen in Figure 7, which are aligned with the nip of the rollers 87, For the sake of clarity of the drawing, the arrangement for supporting the plates 227 and 228 is not shown in Figure 1.
The plate 227 is carried on a pair of spaced arms 229 connected to the channel-section cross-brace 226. The plate 228 is carried on a pair of transversely spaced arms 231 which are pivotally connected to arms 232, allowing the plate 228 to be swung towards and away from the plate 227. Each arm 232 is connected through a rotatably adjustable mounting on the cylindrical cross brace 224.
The plate 228 is movable by hand towards and away from the plate 227 through operation of a spring-loaded toggle linkage, comprising a bar 236 pivotally connected to the middle portion of the plate 228, and a bar 237 pivotally connected to the bar 236 at a knee 238 and itself pivotally mounted on a split clamp 239 secured with a clamping screw 234 on the cylindrical cross brace 224 between the clamps 233. The two parts of the toggle linkage 236 and 237 are biased together by a tension spring 241, and are shiftable by a hand lever 242 from the closed position shown in solid lines to the open position shown in broken lines in which the plate 228 is swung open to allow the leading edge of the web 58 to be fed into the machine.
As shown in Figure 7, the leading and trailing edges of the guide plates 227 and 228 are rounded to avoid tearing of the thin foils with which the machine is intended to be used.
On loosening the clamp 239, the position of the guide plate 228 can be adjusted to align it parallel with the plate 227.
A pair of hollow rectangular section support arms 101, which carry the expander arms 81 and 82, are supported on the inner sides of the side plates 210 forwardly of the guide plates 227 and 228. As shown in Figures 7 and 8, each arm 101 is supported on its plate 210 through two bolts 243 passing through arcuate slots 244 in the outer wall of each support arm 101.
Each support arm 101 is pivotally connected to its adjacent side plate 210 through a dowel pin 246, the position of which is shown in Figures 7, 8 and 9, located in a bore passing perpendicularly through the side plate 89 and in a bore passing partly through the wall of the arm 101 and partly through a small block 245 welded on the support arm 101. The arcuate slots 244 in the support arms 101 are concentric with the dowel pins 246, so that when the bolts 243 are loosened the angle between the support arms 101 can be adjusted by swinging them about the pivotal axis provided by the dowel pins. The two dowel pins 246 are co-axial, so that the support arms 101 together with the expander arms 81 and 82 pivot about a common axis.
As shown in Figure 1, each of the expander arms 81 and 82 is secured to the support arms 101 by a bolt 247 fitting in a circular hole at the rear or entrance end of the expander arm, and acting as a pivot point about which the expander arm can be swung in its own plane, and a series of bolts 248 passing through short arcuate slots 249 concentric with the bolt 247, to allow limited swinging adjustment of the expander arms 81 and 82 relative to their respective support arms 101 about the bolt 247. A fine adjustment member is provided on each arm for controlling this adjustment. The adjustment member, as shown in Figures 1 and 5, consists of a screw 251 passing through a bracket 252 connected on the arm 101. The screw 251 is retained against axial movement by bosses 253 connected on the screw 251 and abutting on opposite sides of the bracket 252. The screw 251 threads into a dower 254 freely turning in a block 256 fixed on the expander arm 82. Within the block 256 is a bore 257 which accommodates the screw 251 with sufficient clearance to allow for the limited swinging of the block 256 relative to the screw 251. A knurled knob 255 is provided for turning the screw 251, so as to shift the arm 81 transversely relative to the support arm 101.
The expander arms 82 are in the form of generally triangular flat plates. The rear edges of the expander arms 81 and 82 are parallel and slightly offset, one above the other. Relative to the plane of the web 58 and the region 79 where it approaches the expander arms 81 and 82, the left hand arm 81 is inclined upwardly in the longitudinal direction of travel of the web, while the right hand arm 82 is inclined downwardly. The expander arms 81 and 82 are also inclined to the horizontal in the transverse direction.
The flat plates which constitute the expander arms 81 and 82 lie perpendicularly to the planes through which their respective support arms 101 pivot about the pivotal support bolts 102. Thus, with the expander arms 81 and 82 inclined upwardly and downwardly with respect to the initial plane of the input web at the point where it enters the expander arms, the inner edges of the expander arms 81 and 82 diverge vcrtically and horizontally.
Each of the expander arms 81 and 82 is provided with gripper devices for retaining and conveying the edges of the web in its travel along the expander arms.
The gripper device for retaining the edge of the web 58 and conveying it along the expander arm, compriscs an endless rcsi licnt belt 258 which runs along the expander arm adjacent the outer margin thercof in contact with the surface of the arm 81 or 82 over which the web 58 travels.
Each belt 258 is supported at opposite ends of the expander arm on pullcys 259 and 261 which are mounted on the inner sides of the support arms 101. The pulley 259 at the rear end of the expander arm is driven while the pulley 261 at the front end is an idler pulley. The pulleys 259 and 261 and the inner surface of the belts 258 have cooperating ribbing to give a positive engagement and positive drive to the belts.
As shown in Figure 6, the belts 258 may be of composite construction, consisting of an inner ribbed wcar rcsistant layer 262 and a thin outer facing layer 263 of a softcr resi licnt material adhered thereto, e.g. of neop rcnc rubber, which can better engage with the webs to be expanded.
The run of the belts 258 which lies adjacent the respective expander arms 81 or 82 is pressed towards the expander arm for increased frictional engagement with the web 58 by a series of pressure shoes 264.
The shoes 264 are arranged along the entire length of the belt with only small spacing between the individual shoes, and each shoe consists of a flat metal plate with gently upwardly curved ends 266 to avoid the edges of the ribbing on the belt 258 catching on the end edges of the shoes.
Each shoe 264 is retained loosely on a central post 267 lying parallel with the general plane of the shoe and secured at its outer end by connection to the inner side of the support arm 101 . At its inner end each post 267 receives a bolt 268 which retains a guide strip 269 extending along the inner edges of the shoes 266 and partly overlapping and engaging against the side edge of the belt 258 so as to guide the belt 258 and retain it against transverse movement.
The post 267 has a narrow central portion 271, and a pair of circumferencial grooves 272 spaced on either side of the portion 271. Each shoe has a guide block 273 secured centrally thercto which is formed at its free end with a central slot 274 receiving the necked portion 271 in loosely rubbing engagement. The sides of the guide block 273 are in rubbing engagement with the end shoulders of the necked portion 271. A split pin 276 may be passed through the free end of the guide block 273, so that the guide block 273 together with the shoe 266 is loosely retained on the post 267.
Each groove 272 in the post 267 reccives a bight portion of a stiff wire spring 277, the ends of which press the shoe 266 towards the expander arm 81 so as to exert spring pressure on the belt 258 to grip and retain the edge of the web 58 against the expander arm 81.
In order to provide a tensioning adjustment for the belts 258, each idler pulley 261 has a longitudinally adjustable support shown in Figure 4. The support arm 101 is formed with slots 278 and 279 in its inner and outer sides which accommodate a cylindrical mounting member 281 receiving the axle of the pulley 261. At the inner side the mounting member 281 has spaced shoulder plates 282 and 283 which bear slidingly on the edges of the slot 278 in the support arm 101. Longitudinal adjustment of the position of the mounting member 281 together with the pulley 261 is effected by an adjusting bolt 284 whose head engages on the end wall 286 of the support arm 101 and whose threaded shank engages in a threaded bore 287 in the mounting member 281.
An anglcd-section covcr 288 or guard is provided over the belt 258 and pressure show arrangement and is screwed to the support arm 101 with screws 289.
The surfaces of the arms 81 and 82 over which the web 58 travels i.e. the upper surface of the left-hnd arm 81 and the lower surface of the arm 82, are made smooth surfaced at least along a major part of their length extending forwardly from the rear or entrance ends of the arms. These surfaces may be polished and may have a polished chromium-plated surface. Alternatively, the surfaces may have a low-friction coating e.g.
a low-friction plastics coating, such as a
TEFLON (Registered Trade Mark) coating, so that the web to be expanded will glide smoothly over the arms 81 and 82. It has becn found that with this arrangement tearing, deformation or wcar of thin foils to be expanded is reduced, while satisfactory grip on and retention of the edges of the web can be obtained. at least where the full width of the belts 258 is applied on the expander arm surface. However, as can best be seen from
Figure 1, at the forward end of the expander arms 81 and 82 the belts 258 extend beyond the inclining inner edges of the arms 81 and 82, and at this region the width of foil 58 gripped between the belt 258 and the arm 81 or 82 is somewhat smaller. To avoid premature release of the edges of the foil, the expander arms 81 and 82 may be grooved at the forward end on the surface adjacent the belt 258 so as to increase the frictional grip. For convenience of machining, and also to allow substitution of a smooth-surfaced end portion where it is found that the grooves are unnecessary for a satisfactory grip or that they unduly tear, deform or wear a particular foil, the expander arms have separable end pieces 8 la and 82a on which the grooves 290 are formed, as shown in Figures 5 and 5a. The grooves 290 extend parallel to the support arm 101 and are of saw tooth profile with their inclining faces sloping away from the inner edges of the pieces 81a and 82a so as to give a configuration tending to resist transverse withdrawal of the foil. The end pieces 81a and 82a are retained in abutting alignment with the main portions of the arms 81 and 82 by securement to the block 256 of the fine adjustment device with bolts 300, and are further retained on the support arms 101 by the bolt 248 at the forward end of the support arm 101.
Referring now to Figure 2, the drive mechanism for the belts 258 and rollers 87 is shown. A motor 138 drives a pulley 139 through a gear box 141. A belt 142 transmits the drive to a main drive pulley 143 which turns a spur gear 144 carried on a shaft 146 extending transversely of the adjacent support arm 101 carrying the expander arm 81. The shaft 146 is journalled in a bracket 291 on the outer side of the side plate 89. The gear 144 meshes with the spur gear 147 on a parallel shaft 148 journalled in the support arm 101 which turns the pulley 259 driving the belt 258.
The main drive 143 connects co-axially with a sprocket wheel 156 driving a chain 157 which turns a sprocket wheel 158 connected through a shaft 159 to one of the rubber covered rollers 87 which feed the web 58 towards the expander arms 81 and 82. The rollers 87 are coupled together through interengaging gears 161 and 162 at one end. A shaft 163 extending from one of the rollers 87 at the other end drives a sprocket 164. The sprocket 164 is coupled through chain 165, to a sprocket wheel 166 connected on a shaft 167 journalled in a bracket 292 on the outer side of one side plate 210. The shafts 146 and 167 are coaxial with one another and with the dowel pins 246 about which the expander arms 81 and 82 swing, so that when the angle of the expander arms is adjusted, the gear 147 and 171 rock around the gears 144 and 169, respectively, without losing driving engagement.
It should be noted that the drive gear 161 which drives the rubber covered feed rollers 87 additionally drives a sprocket wheel 174 coupled to a power take-off shaft 176 through a shaft 177 and a pair of bevel gears 178. The power take-off shaft 176 may be used to drive apparatus which composes the output web of expanded metal from the expander machine into a multiple layer mass, or may serve to synchronize the operation of such apparatus with the operation of such apparatus with the operation of the expander machine.
In operation of the machine, the guide plate 228 should initially be in open position and the rollers 87 in separated position until after the web has its edges are gripped between the belts and the arms. The guide plate 228 and the rollers 87 are then restored to the closed position so that in subsequent running of the machine, the rollers 87 feed the web forwardly and the plates 277 and 228 smooth out the feed of the web and will deliver it directly to the expander arms 81 and 82 in alignment with the rear edges of the arms. The spacing between the plates 227 and 228 is selected so that with the thickness of web 58 to be employed, the web 58 can run freely between the plates yet will be positively guided without opportunity for misalignment. The edges of the web 58 are gripped between the belt 258 and the outer edges of the arms 81 and 82 so that the forward movement of the belts draws the web forwardly along the expander arms 81 and 82. The web is carried longitudinally over the upper surface of the left-hand expander arm 81 and over the lower surface of the right-hand expander arm 82. With the left-hand expander arm 81 inclined upwardly with respect to the initial plane of the web 58, and the right-hand expander arm 82 inclined downwardly, the inner edges of the expander arms 81 and 82 diverge both in the lateral direction and in the direction normal to the initial plane of the web. As the web moves progressively forwardly, it slips laterally over the inner edges of the expander arms.
Figure 12 shows the expansion of slit metal foil 58, which has an array of parallel longitudinal slits 194 of uniform length arranged in regularly spaced parallel longitudinal rows, with the slits in adjacent rows being longitudinally staggered with respect to one another. As a result of the divergence of the expander arms 81 and 82, a lateral force of tension is developed in the web 58 causing the slits 194 to open out into diamond shaped meshes along the zones where the web 58 passes over the edges of the expander arms. In the regions of the web 58 remaining in contact with the flat sur faces of the expander arms 81 and 82, the web 58 is supported against deformation, and the slits 194 thus remain unopened until the web 58 slips over the edge of the expander arm.
In order to obtain uniformly sized and orientated diamond meshes, it is desirable to arrange the expander arms 81 and 82 so that their inner edges are inclined with respect to the slits 1 94 in the web so as to be parallel to the angle at which laterally adjacent slits 194 are off-set. This orientation is shown in Figure 1 2. It will be noted that adjustment of the portion of the arms 81 and 82 noted previously, in order to obtain uniformly sized and orientated diamond shaped meshes, can be carried out using the fine adjustment member 251.
The degree of lateral expansion of the web, i.c. the increase in the width of the expanded web as compared with the original web can be varied by swinging the expander arms 81 and 82 towards or away from one another about the axes of the dowel pins 246.
When adjustments are made in the angles of inclination of the arms 81 and 82, by tilting the support arms 101 about the axes of the dowel pins 246, the forward ends of the expander arms 81 and 82, where the output expanded web is released from gripping engagement between the belts 258, will swing about a tilted axis, so that one arm becomes raised while the other lowers as the adjustment is made. Once the adjustment is made, the sub-frame 21 of the machine can be tilted about the axis 22 by turning the handwheel 38, thus restoring the plane of the output expanded web to the horizontal.
The expander machine can accommodate input webs of varying widths, and the permissible range of variation of the width is approximately twice the transverse width of the belts 258 which are employed. Within these limits, the edges of the web can be gripped between the area of overlap between the belts 258 and the expander arms 81 and 82.
The form shown in the drawings, in which belts 258 are supported so as to extend beyond the inner inclining edges of the expander arms 81 and 82 at the front end is especially advantagcous since it allows the web to be expanded across its full width without Icaving any unexpanded selvedge and without deforming the edges of the web out of the general plane of the unexpanded product. As can be seen in Figure 6, towards the forward end of the expander arms, the belt 258 extcnds inwardly beyond the inner inclining edges of the expander arms. It has been found that in practice this does not interfere with the frec expansion of the web, since as can be seen in Figure 6, the expanded material 291 slopcs sharply away from the belt 258 at the point where it slips over the edge of the expander arm 81. Forwardly of the region shown in Figure 6, the edge portions of the web 58 slips over the inclining inner edges of the arms 81 and 82, and it is found that with the appropriate angled orientation between the inner edges of the arms 81 and 82 and the slits in the web 58, as explained above with reference to
Figure 12, the edge portions of the web 58 are expanded to the same desired extent as the intervening parts of the web which have been expanded before the web reaches the for
Claims (5)
1. A machine for expanding metal webs comprising a pair of expander arms with vertically and horizontally diverging edges along which a slit web is passed forwardly, the web slipping laterally over the diverging
edges and being spread therebetween so as to open the slits in the web out into diamond-shaped meshes, the surfaces of each expander arm on which the web is to be supported and over which the web slips being smooth-surfaced at least in a region extending forwardly from the rear of the arm and over a major part of its length, and wherein the web is conveyed by being gripped at each edge between the smooth surface of the expander arm and a driven endless belt which runs along the expander arm and is pressed towards the smooth surface.
2. A machine as claimed in claim 1 in which the belt has an inner wear-resistant layer and an outer layer of softer resilient material which presses against the web.
3. A machine as claimed in claim 1 or 2 wherein the belt extends beyond the diverging edge of each expander arm at the forward end and at this end the expander arm has longitudinal grooves for engaging frictionally with the web.
4. A machine as claimed in claim 3 wherein the grooves are of saw-tooth section.
5. A machine for expanding metal webs substantially as described herein with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1246580A GB1591887A (en) | 1977-09-01 | 1977-09-01 | Machine for expanding metal webs |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1246580A GB1591887A (en) | 1977-09-01 | 1977-09-01 | Machine for expanding metal webs |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1591887A true GB1591887A (en) | 1981-07-01 |
Family
ID=10005113
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1246580A Expired GB1591887A (en) | 1977-09-01 | 1977-09-01 | Machine for expanding metal webs |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1591887A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0251735A2 (en) * | 1986-06-30 | 1988-01-07 | Watership Pty. Ltd. | A process and machine for the formation of expanded mesh materials |
-
1977
- 1977-09-01 GB GB1246580A patent/GB1591887A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0251735A2 (en) * | 1986-06-30 | 1988-01-07 | Watership Pty. Ltd. | A process and machine for the formation of expanded mesh materials |
| EP0251735A3 (en) * | 1986-06-30 | 1990-02-07 | Watership Pty. Ltd. | A process and machine for the formation of expanded mesh materials |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |