US3604302A

US3604302A - Brush anvil

Info

Publication number: US3604302A
Application number: US11174A
Authority: US
Inventors: Craig W Smythe
Original assignee: DOVEY Manufacturing Co
Current assignee: DOVEY Manufacturing Co
Priority date: 1970-02-13
Filing date: 1970-02-13
Publication date: 1971-09-14
Anticipated expiration: 1988-09-14

Abstract

An anvil for a rotary cutting device including a section having brush bristles with terminal ends defining a cylindrical anvil surface against which a cutting knife operates.

Description

United States Patent Inventor Craig W. Smythe Muncie, lnd. App]. No. 11,174 Filed Feb. 13. 1970 Patented Sept. 14, 1971 Assignee Dovey Manufacturing Company Anderson, Ind.

BRUSH ANVlL 11 Claims, 4 Drawing Fig.

0.8. CI 83/659, 83/347, 93/58.4 Int. Cl 826d 7/20, 826d 1/56 Field of Search 83/659,

[56] References Cited UNITED STATES PATENTS 3,363,496 1/1968 Sauer 83/659 3.508,460 4/1970 Goettsch 83/659 X Primary Examiner.lames M. Meister Attorney-Meyer, Tilberry & Body ABSTRACT: An anvil for a rotary cutting device including a section having brush bristles with terminal ends defining a cylindrical anvil surface against which a cutting knife operates.

PATENTED SEP] 4 I97! SHEET 1 OF 2 &

PATENT USEP] 4 I971 SHEET 2 OF 2 BRUSH ANVIL BACKGROUND OF THE INVENTION This application pertains to the art of cutting and more particularly to cutting of cardboard, corrugated board and similar materials.

The invention is particularly applicable to high-speed rotary-cutting devices in which a cutting knife attached to a rotatable support acts against a rotatable anvil to cut sheet material being fed between the anvil and knife support.

In the art of cutting cardboard and corrugated paper board or the like, it is common to feed sheets of such material between a rotatable anvil and a rotatable knife support. The anvil is commonly covered with a resilient material such as urethane plastic. The knife support includes one or more rule knives having cutting edges which press against the resilient anvil surface to cut the sheet material. The knife or knives commonly include cutting edges which make cuts in a plane perpendicular to the rotational axis of the anvil. These cutting edges may be termed longitudinal or circumferential cutting edges. The knives also commonly have lateral cutting edges which contact the surface of the anvil along lines extending from one side edge of the anvil toward the other. The anvil is rotated to a new indexed position with each cut so that each lateral cutting edge contacts the anvil along a new line with each succeeding cut. For example, a cylindrical anvil having a diameter of one foot has a circumference of around 37.7 inches. If a lateral cutting edge contacts the anvil along a line which is l/64 inch wide, it is theoretically possible to make over 2,400 lateral cuts without contacting the anvil along the same line with that lateral cutting edge. While such accurate indexing is not possible in practice, it is still possible to make an extremely large number of lateral cuts without contacting the anvil along the same line. Therefore, deterioration of the anvil surface due to contact with lateral cutting edges is minimized. In contrast, a longitudinal or circumferential cutting edge contacts the anvil along the same circumferential line with each succeeding cut. This causes very rapid deterioration of the anvil surface in a localized area. In addition, contact of the longitudinal cutting edge in a localized area causes a rapid buildup of fibers from the sheet material being cut. That is, fibers from the material being out are forced into the anvil surface. The anvil then becomes less resilient in the localized area contacted by the longitudinal cutting edge and the longitudinal cutting edge will become dull must more rapidly than a lateral cutting edge. Attempts have been previ ously made to solve this problem. One of these involved using an anvil having a brush bristle surface. With a brush bristle surface, the longitudinal cutting edge will simply project downwardly into the brush bristles and rapid localized deterioration will not occur. In addition, fibers displaced from the material acted upon by the longitudinal cutting edge will simply be forced downwardly into the brush bristles and localized loss of resiliency will not occur to cause dulling of the longitudinal knife. This type bristle anvil could not support the sheet. It would be driven into the anvil. Consequently, previous attempts to utilize brush bristle anvils have not been very successful because lateral cuts were also made against a brush bristle surface and the sheet material being cut lacked adequate support against the readily deformable brush bristles. This becomes particularly troublesome as the cutting knives become dull. In addition, proper indexing of the anvil would not occur because the brush bristles lacked sufi'rcient stiffness to self-index through contact with a moving lateral blade. In other arrangements, multiple station cutting apparatus has been utilized. That is, one resilient surface rotary anvil was used for lateral cuts and the material was then fed to another cutter for longitudinal cuts. It is very difiicult to obtain proper positioning of the lateral and longitudinal cuts relative to one another in this type of device.

SUMMARY In accordance with the present invention, a cutting device of the type described is provided with an anvil having both a brush bristle anvil surface and a resilient surface of urethane plastic or similar material. More specifically, the brush anvil of the present invention includes an arcuate support member extending over an arc of substantially The support member has an outer arcuate surface and brush bristles are secured to the support member so as to extend outwardly from the outer surface of the support member. The brush bristles have terminal ends defining a cylindrical surface extending over an arc of substantially 180. The support member includes attaching means for attaching the support member to a cylindrical anvil for use in cutting apparatus of the type described.

In accordance with one arrangement, the brush bristles are secured to a brush back and the brush back in turn is secured to the support member. In addition, the attaching means for the support member extends laterally thereof so that the support member can be attached to the side edge of a cylindrical anvil. In one arrangement, the brush back may be flexible so that it can be bent into conformity with the arcuate outer surface of the support member.

In accordance with a preferred arrangement, the rotary cylindrical anvil of the present invention includes mounting means for mounting a pair of arcuate resilient surface members and a pair of brush bristle support members. Each of the arcuate resilient surface members extend over an arc of substantially 180. The arcuate resilient surface members are positioned with their terminal ends abutting one another and with their concave inner surfaces facing one another so as to define a cylindrical resilient anvil surface. The arcuate resilient surface members have side edges and at least one of such side edges is formed with an interlocking means for cooperating with an interlocking means formed on a side edge of a brush bristle support member so that attachment of the support member to the mounting means also holds the resilient surface members in position on the mounting means. The improved anvil of the present invention is used in combination with a rotatable knife support positioned adjacent the anvil. Knife means attached to the knife support includes longitudinal cutting edge means positioned for contacting the brush bristles on the anvil, and lateral cutting edge means positioned for contacting the resilient anvil surface.

It is a principle object of the present invention to provide an improved rotary cylindrical anvil for use in rotary cutting apparatus.

It is a further object of the present invention to provide an improved rotary cylindrical anvil which is not subject to rapid deterioration in a localized circumferential area due to substantially continuous contact with a longitudinal cutting edge.

It is also an object of the present invention to provide a rotary cylindrical anvil having an improved brush anvil surface.

It is an additional object of the present invention to provide an improved arcuate brush for use as a brush anvil in a rotary cylindrical anvil.

BRIEF DESCRIPTION OF THE DRAWING The invention may take physical form in certain parts and arrangements of parts, a preferred embodiment of which will be described in detail in the specification and illustrated in the accompanying drawings which form a part hereof.

FIG. 1 is a side elevational view of a rotary cutting apparatus of the type in which the improved anvil of the present invention is used;

FIG. 2 is a plan view of a cutting knife looking in the direction of arrows 2-2 of FIG. 1;

FIG. 3 is a plan view of the improved anvil of the present invention looking in the direction of arrows 3-3 of FIG. 1; and

FIG. 4 is a perspective view showing the improved anvil of the present invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT Referring now to the drawings, wherein the showings are for purposes of illustrating a preferred embodiment of the invention only and not for purposes of limiting same, FIG. 1 shows rotary cutter A which rotates in the direction of arrow 12, and cooperates with rotary anvil B which rotates in the direction of arrow 14 to cut sheet material fed between cutter A and anvil B in the direction of arrow C. The material acted upon may be cardboard, or corrugated paper board and like materials. Such material is fed between cutter A and anvil B in flat sheet form to be cut in appropriate locations for any desired purpose such as forming blanks adapted to be folded into a box. Cutter A and anvil B are mounted for rotation about axes 16 and 18 in a known manner. Rotary cutter A may have any desired number of cutting knives of any desired shape mounted on the outer periphery thereof and only one such cutting knife is shown at D. Knife D includes a longitudinal or circumferential cutting edge 22 and a lateral cutting edge 24. It will be recognized that the cutting edges may be serrated for improved cutting performance. Longitudinal cutting edge 22 may be curved into conformity with the curvature of rotary cutter A as shown in FIG. 1 if so desired.

It will be recognized that longitudinal cutting edge 22 contacts anvil B along a circular line which lies in a plane perpendicular to rotational axis 18 of anvil B. In contrast, lateral cutting edge 24 will contact anvil B in a different location every time a cut is made due to the fact that anvil B is indexed or rotated to a new position with each succeeding cut. Therefore, it is possible to make an extremely large number of cuts with lateral cutting edge 24 before the same area of anvil B is contacted by lateral cutting edge 24.

In accordance with the invention, anvil B is provided with a resilient cylindrical anvil surface E formed of such materials as urethane plastic, or natural or synthetic rubber, and a cylindrical brush bristle anvil surface G. With this arrangement, rotary cutter A and anvil B are positioned so that longitudinal cutting edge 22 will act against cylindrical brush bristle surface G while lateral cutting edge 24 acts against resilient anvil surface E. It will be recognized that a short length of lateral cutting edge 24 adjacent longitudinal cutting edge 22 may also act against brush bristle surface G. In this manner, longitudinal cutting edge 22 pierces material being cut and projects into brush bristle surface G without causing rapid deterioration of the anvil surface in a localized area due to repeated cuts by longitudinal cutting edge 22. In addition, fibers from material being out are simply forced downwardly into brush bristle anvil surface G, and do not buildup in a localized area acted upon by longitudinal cutting edge 22 and cause loss of resiliency to the anvil surface and dulling of the cutting edge. At the same time, resilient anvil surface E provides a wide firm support for material being cut so that cutting action by longitudinal cutting edge 22 will occur. Without support from resilient surface E, material being cut could simply be pressed inward of brush bristle surface G by deformation of the brush bristle so that effective cutting action by longitudinal cutting edge 22 would not take place. In addition, contact of material being cut with resilient surface E provides high frictional contact for proper feeding of the material through the cutting apparatus. Contact of lateral cutting edge 24 with the resilient surface E will also properly index anvil B and this might not occur if the entire anvil were formed of brush bristles. Where an entire anvil is made of brush bristles, the entire anvil surface is easily deformed when knife D contacts sheet material and the deformation may be sufficient to prevent complete penetration of knife D through the sheet material. With the anvil of the present invention, accurate penetration is maintained by having a relatively wide and less easily deformable resilient surface E against which sheet material being cut is supported. With the sheet material in contact with resilient anvil surface E, it will support itself as it cantilevers out from resilient surface E over brush bristle surface G. 11: would be necessary to bend or break the cantilever portion before it would be pressed deep enough into brush bristle surface G to prevent complete penetration by longitudinal cutting edge 22. At the same time, brush bristle surface G provides sufiicient support to prevent such bending or breaking of the cantilever portion, and also provides sufficient support to insure clean cuts and prevent tearing as longitudinal cutting edge 22 penetrates through to the back side of sheet material being cut.

In a preferred arrangement, anvil B includes a pair of substantially identical mounting members H and J which define mounting means for resilient anvil E and brush bristle surface G. Each mounting member H and J has an arcuate convex

outer surface

26 and 28, and a concave inner surface 30 and 32. Mounting members H and J have terminal ends 34 and 36, and 38 and 40. Each mounting member H and J extends over an arc of substantially I". Mounting members H and J are positioned with concave inner surfaces 30 and 32 facing one another, and with terminal ends 34 and 38, and 36 and 40, abutting one another. In this position,

outer surfaces

26 and 28 of mounting members H and J cooperate to define a cylindrical surface. Inner surfaces 30 and 32 of mounting members H and J may be provided with suitable axially extending recesses as at 42 and 44 for keying mounting members H and J on a rotatable mandrel.

Mounting members H and J may be secured together in any desirable manner and in one arrangement the terminal ends of mounting members H and J are recessed for receiving an assembly member. Terminal ends 38 and 40 of mounting member J are provided with

recesses

46 and 48, and it will be understood that terminal ends 34 and 36 of mounting member H are similarly recessed. Pairs of aligned holes 50 and 52 are formed in mounting members H and J and enter

recesses

46 and 48. Suitable pins, only one of which is shown at 54, are inserted through aligned holes 50 and 52 so as to extend across

recesses

46 and 48. A securing device K includes a screw member L having left-hand threads 56 on one end and righthand threads 58 on the other end. Securing members 60 and 62 are threadedly received on threads 56 and 58 so that selective rotation of screw L will cause securing members 60 and 62 to move toward and away from one another. Each securing member is provided with a pair of substantially

U-shaped slots

64 and 66, and 68 and 70. With pins 54 received through all of aligned pairs of holes 50 and 52, screw L may be rotated to move securing members 60 and 62 toward one another so that they will fit in

recesses

46 and 48 between pins 54. Screw L is then rotated in an opposite direction to move securing members 60 and 62 away from one another so that pins 54 will be received in slots of 64, 66, 68 and 70 to hold mounting members H and J together.

Outer surfaces

26 and 28 of mounting members H and J are provided with recessed

shoulders

74 and 76, and 78 and 80. Side edges 84 and 86 of mounting members H and J are provided with circumferentially spaced threaded bores 88 and 90, and

shoulder portions

92 and 94 project outwardly from side edges 84 and 86. The opposite side edges of mounting members H and J are similarly formed. In accordance with a preferred arrangement, a pair of substantially identical resilient surfaces anvil members M and N are provided. Each resilient surface anvil member M and N includes a rigid arcuate portion 08 and 102, and an outer relatively rigid but

resilient covering

104 and 106 of such materials as urethane plastic, or natural or synthetic rubber.

Resilient members

104 and 106 may be bonded to the outer surfaces of rigid members 98 and 102 by any suitable adhesive in a known manner. The inner surface of rigid member 98 is provided with projections adjacent the side margins thereof, only one of which is shown at 108, for reception in recessed

shoulders

76 and 74 of mounting member H. Rigid member 102 is similarly provided with projections 1 l0 and 112 for reception in recessed shoulders 78 and 80 of mounting member J. Resilient surface anvil member M includes terminal ends 116 and 1 18, while resilient surface anvil member N has terminal ends 120 and 122.

Resilient surface anvil members M and N are positioned with terminal ends 116 and 120, and 118 and 122, contacting one another so that the outer surfaces of

resilient members

104 and 106 define a cylinder. Resilient surface anvil members M AND N include side edges 126 and 128, and 130 and 132. Spaced inwardly from

side edges

126 and 128, resilient surface anvil member M is formed with arcuate grooves in rigid backing member 98, and only one of which grooves is shown at 134. A corresponding groove is formed in rigid backing member 98 spaced inwardly from side 126 of resilient anvil surface member M. Resilient anvil surface member N is also formed with arcuate grooves in rigid backing member 102 spaced inwardly from

side edges

130 and 132 as at 136 and 138. One side of each groove 136 and 138 is defined by a projecting flange 140 and 142. It will be understood that the grooves adjacent side edges 126 and 128 of resilient surface anvil member M are correspondingly formed with flanges.

In accordance with a preferred arrangement, brush bristle anvil surface G of FIG. 3 is defined by a pair of arcuate brush anvil members P and R as shown in FIG. 4. Brush anvil members P AND R are substantially identical and each includes a rigid

arcuate support member

150 and 152.

Support members

150 and 152 include concave inner surfaces 154 and 156, and terminal ends 158 and 160, and 162 and 164. Each

support member

150 and 152 extends over an arc of substantially l80 between terminal ends 158 and 160, and 162 and 164.

Support members

150 and 152 have

axial holes

168 and 170 extending completely therethrough. Each

support member

150 and 152 further includes a

side edge surface

172 and 174 which lies in a plane substantially perpendicular to cylindrical inner concave surfaces 154 and 156. Support member 152 includes an opposite side edge 176 and it will be understood that support member 150 is formed with a corresponding side edge. Side edge 176 has an arcuate groove 178 formed therein and one side of arcuate groove 178 is defined by an outwardly projecting flange 180. Arcuate groove 178 lies on the circumference of a circle and extends from terminal end 162 to terminal end 164 along side edge 176. It will be understood that support member 150 is similarly formed with a groove and projecting flange corresponding to groove 178 and flange 180 along its side edge opposite side edge 172. The outer surface of support member 152 is formed with an arcuate recess extending from terminal end 162 to terminal end 164 and the recess has a cylindrical bottom surface 182. Support member 152 includes a pair of spaced-

apart flanges

184 and 186 which are spaced outwardly from bottom surface 182 and project toward one another to define arcuate grooves 188 and 190 at opposite sides of the arcuate recess. It will be understood that support member 150 is formed with a recess in its outer surface in the same manner as support member 152. A flexible and bendable brush back member 194 formed of any desirable bendable material such as polyamide or urethane has holes formed therein for receiving tufts of brush bristles in a manner well known in the brush art. Tufts of brush bristles 198 are positioned in such holes and held in place as by stitching, stapling or adhesives. Brush bristles 198 may be formed of synthetic material such as polyamide or may be of natural bristle material. Brush bristles 198 do not occupy the entire front face of brush back 194 so that the opposite side portions of brush back 194 are absent any bristles and can be received in grooves 188 and 190. The opposite side portions at one terminal end of bush back 194 are positioned in alignment with grooves 188 and 190. An axial force is then applied to brush back 194 so that its side edge portions will slide into grooves 188 and 190 with a tight fit. Brush back 194 is formed so as to be coextensive in length with support member 152 between terminal ends 162 and 164. It will be recognized that there are many other ways of attaching brush bristles to the outer surface of

support members

150 and 152 if so desired.

In the preferred arrangement, mounting members H and J are assembled as previously described with resilient surface anvil members M AND N positioned thereon. Brush anvil R is then moved toward side edge 132 of resilient surface anvil member N until flange 180 on side edge 176 is positioned in groove 138 of rigid backing member 102. Flange 142 on rigid backing member 102 will then be received in groove 178 on side edge 176 of support member 152. Holes 170 in support member 152 are then aligned with threaded bores in mounting member J. A plurality of bolts, only one of which is shown at 202, extend freely through holes 170 and thread into bores 90 to tightly clamp support member 152 against the side of mounting member J. Groove 138 and flange 142 on rigid backing member 102, and groove 178 and flange 180 on support member 152, cooperate with one another to define an interlocking means for holding resilient surface anvil member N securely against mounting member J. Brush anvil P is positioned against mounting member H and holds resilient surface anvil member M against mounting member H in same manner as described with reference to the cooperation between support member 152, resilient surface anvil member N and mounting member J. With both brush anvil members P and R assembled, terminal ends 158 and 162, and 160 and 164, abut one another and the outer terminal ends of brush bristles 198 define a cylinder. The parts are dimensioned so that the edge of brush bristles 198 adjacent side edge 176 of support member 152 abut side edge 132 of resilient surface member N when the parts are assembled as described. A pair of clamping members S and T are provided for holding the opposite sides of resilient surface anvil members M and N to mounting members H AND J. Each clamping member 8 and T extends over an arc of substantially 180 and is provided with circumferentially spaced

holes

206 and 208. Each clamping member S and T is also provided with an

arcuate groove

212 and 214, and a projecting

flange

216 and 218. Flange 218 on clamping member T is receivable in arcuate groove 136 of rigid backing member 102, and flange is receivable in groove 214. Bolts similar to that shown at 202 are then received through

holes

206 and 208 in clamping members S and T and thread into threaded bores corresponding to those at 88 and 90 in the opposite side edges of mounting member H and J. In the preferred arrangement,

outer surfaces

220 and 222 of clamping members S and T have a width which is the same as, or slightly less than, the distance from the bottom of groove 136 to side edge 130. With such an arrangement, it is possible to position a plurality of anvil members B on a common mandrel in abutting relationship with one another. In addition, it is possible to provide a resilient surface anvil member adjacent side edges 172 and 174 of support members and 152 so that brush anvils P and R have resilient surface anvil members extending outwardly from both sides thereof.

In the preferred arrangement, the cylinder defined by the outer terminal ends of brush bristles 198 has a diameter slightly greater than the diameter of resilient surface anvil member E. With such an arrangement, firm support against the back side of sheet material being cut by longitudinal knife 22 is ensured.

An anvil of the type described is commonly referred to in the industry as a stitch lap anvil. Previous stitch lap anvils have included a circumferential slot in which a longitudinal portion of a cutting knife is receivable. The longitudinal cutting knife contacts a side face of the slot with a scissors action. Due to the desirability of a scissors action, the sidewall of the slot is made of metal. Anvils of this prior type have included resilient anvil surfaces extending laterally from the circumferential slot. However, a metal transition surface exist between the slot and the resilient anvil surface. This metal transition surface requires that a portion of the lateral cutting knife act against a metal surface. That portion of the cutting knife acting against this metal transition surface becomes dull very rapidly and results in incomplete cuts being made. The improved anvil of the present invention has no metal transition surface and the transition is directly from a brush anvil surface to a resilient anvil surface. Therefore, a small portion of the lateral cutting edge will act against a brush anvil surface and the problem with rapid dulling of that portion of the lateral knife is eliminated.

It is to be understood that the disclosed embodiment is illustrative and is not to be taken in a limiting sensev The present invention includes all equivalent variations and obvious modifications of the disclosed embodiment and is limited only by the scope of the claims.

I claim:

1. A brush anvil for a rotary cutting device comprising; an arcuate support member extending over an arc of substantially 180, said support member having an outer arcuate surface, brush bristle means secured to said support member and extending outwardly from said outer surface, said bristle means having terminal ends defining a cylindrical surface extending over an arc of substantially 180 said support member including attaching means for attaching said support member to a cylindrical anvil.

2. The brush anvil of claim 1 and further including brush back means, said bristle means being secured to said brush back means and said brush back means being secured to said support member.

3. The brush anvil of claim I wherein said attaching means extends laterally of said support member.

4. The brush anvil of claim 1 wherein said support member has opposite arcuate side surfaces, at least one of said side surfaces having interlocking means formed thereon for interlocking said support member with a cover member for a cylindrical anvil.

S. The brush anvil of claim 4 wherein said interlocking means comprises an arcuate groove extending along the entire extent of said one side surface.

6. The brush anvil of claim 1 wherein said bristle means are secured to a flexible backing member and said backing member is deformed to an arcuate shape and secured to said support member.

7. The brush anvil of claim 6 wherein said support member has terminal ends and said outer surface of said support member has an arcuate recess formed therein extending throughout the length thereof from one terminal end to the other, said recess having a bottom surface and opposite side edges, said support member having flange means spaced outwardly from said bottom surface of said recess and projecting over portions of said bottom surface from said side edges of said recess to define arcuate grooves, said flexible backing member having opposite side edge portions received in said grooves.

8. A cylindrical anvil for a rotary cutting device comprising; a cylindrical resilient anvil surface having opposite circular side edges, and a cylindrical brush bristle anvil positioned adjacent at least one of said side edges, said brush bristle anvil being defined by brush bristles having terminal ends lying on the surface of a cylinder having a larger diameter than the diameter of said cylindrical resilient anvil surface.

9. The anvil of claim 8 wherein said brush bristle anvil is defined by a pair of arcuate support members each extending over an arc of substantially 1 each of said support members having an outer arcuate surface, said brush bristles being secured to said support members and extending outwardly from said outer surfaces.

10. The anvil of claim 9 wherein said resilient anvil surface is defined by a pair of arcuate resilient surface members each extending over an arc of substantially l80, said anvil including mounting means for said support members and said resilient surface members, said support members including attaching means for attaching said support members to said mounting means, said support members and said resilient surface members having cooperative interlocking means for holding said resilient surface members to said mounting means.

11. The device of claim 8 and further including a rotatable knife support positioned adjacent said anvil, knife means attached to said knife support, said knife means having longitudinal cutting edge means positioned for contacting said brush bristles and lateral cutting edge means positioned for contacting said resilient anvil surface.

Claims

1. A brush anvil for a rotary cutting device comprising; an arcuate support member extending over an arc of substantially 180*, said support member having an outer arcuate surface, brush bristle means secured to said support member and extending outwardly from said outer surface, said bristle means having terminal ends defining a cylindrical surface extending over an arc of substantially 180 *, said support member including attaching means for attaching said support member to a cylindrical anvil.

3. The brush anvil of claim 1 wherein said attaching means extends laterally of said support member.

5. The brush anvil of claim 4 wherein said interlocking means comprises an arcuate groove extending along the entire extent of said one side surface.

9. The anvil of claim 8 wherein said brush bristle anvil is defined by a pair of arcuate support members each extending over an arc of substantially 180* each of said support members having an outer arcuate surface, said brush bristles being secured to said support members and extending outwardly from said outer surfaces.

10. The anvil of claim 9 wherein said resilient anvil surface is defined by a pair of arcuate resilient surface members each extending over an arc of substantially 180*, said anvil including mounting means for said support members and said resilient surface members, said support members including attaching means for attaching said support members to said mounting means, said support members and said resilient surface members having cooperative interlocking means for holding said resilient surface members to said mounting means.