US1485827A

US1485827A - Machine for making wire fabric

Info

Publication number: US1485827A
Application number: US602422A
Authority: US
Inventors: George E Bull
Original assignee: Pittsburgh Steel Co
Current assignee: Pittsburgh Steel Co
Priority date: 1922-11-21
Filing date: 1922-11-21
Publication date: 1924-03-04
Anticipated expiration: 1941-03-04

Description

G. E. BULL MACHINE FOR MAKING WIRE FABRIC March 4 5 Sheets-Sheet 1 Mam? 4 G. E. BULL MACHINE FOR MAKING WIRE FABRIC Filed Nov. 21 1922 5 Sheets-Sheet 2 G. E. BULL MACHINE FOR MAKING WIRE FABRIC March 4 5 heets-Sheet 5 W i i Filed March 12%., 1,485,827

a. E. BULL.

MACHINE FOR MAKING WIRE FABRIC Filed NOV. 21 1922 5 Sheets-Sheet 4 March 4 G. E. BULL.

MACHINE FOR MAKING WIRE FABRIC 1922 5 Sheets-Sheet 5 Filed Nov. 21

Patented Mar. 4, 1924.

TTS

GEORGE E. BULL, OF MONESSEN, PENNSYLVANIA, ASSIGNOR TO PITTSBURGH STEEL COMPANY, OF PITTSBURGH, PENNSYLVANIA, A CORPORATION OF PENNSYLV 1 MACHINE FOR MAKING WIRE FABRIC.

Application filed November 21, 1922. Serial No. 602,422.

T all 1072 am it may concern:

Be it known that I, GEORGE E. BULL, a citizen of the United States, and resident of Monessen, in the county of VVestmoreland and State of Pennsylvania, have invented a new and useful Improvement in Machines for MakingWire Fabric"; and I do hereby declare the following to be a full, clear, and exact description thereof.

My invention relates to a machine for making wire fabric, and more especially a wire fabric having a backing sheet of paper or other suitable material permanently secured thereto, and generally employed in construction work in connection" with the walls and ceilings of buildings. Such a fabric is illustrated and described in an application filed by Edward L. Benedict, Serial No. 484,924, July 15, 1921, and the object of my invention is to provide a machine for producing such fabric incomnlc jcial quantities in sheets of any desired length.

To these ends my invention consists in the novel features hereinafter set forth and,

claimed.

In the accompanying drawings, Fig. 1 is a side elevation; Fig. 2 is a longitudinal section on the line 22, Fig. 3; Fig. 3 is a plan view with the paper roll omitted; Fig. 4 is an enlarged face view of the crim per bars, looking from the left of Fig. 1;

Fig. 5 is a section on the line 55, Fig. 4;

Fig. 6 is a section on the

line

66, 4, showing the tie wire cutter; Fig. 7 151111 enlarged detail of a portion of the upper crimping bar, at the cutter end of the bar: Fig.8 is a section similar to Fig. 5. sh0wing the crimper bars closed together to form the crimp; Fig. 9 is a section on the line 99, Fig. 8; Fig. 10 is a section similar to Fig. 8 showing the folding over of the tie wire; Fig. 11 an elevational view of Fig. 8; Fig. 12 is an elevational view of Fig. 10; Fig. 13 an enlarged detail partly in section of the pulling finger and advancing arm; Figs. 14 and 15 are enlarged plan and 7 .end elevational views respectively of said finger and arm; Fig. 16 is a sectional. plan of the folding mechanism: Fig. 17 is a detail of the paper holder; Fig. 18 is a plan view of a portion of the finished fabric; and Fig. 19 is a section taken on the line 19-19, Fig. 18; and Fig. 20 is a face view of a portion of the guide bar at the rear of the machine.

suitable frame Ain. which is mounted the main drive shaft 2 in suitable bearings. The fast and loose pulleys 3 are mounted on.the shaft 2 to be driven from any suitable source of power.

Mounted on the shaft 2 is a pinion 4 which meshes with the gear-wheel 5 mounted on the shaft 6.

The gear-wheel 7 on the shaft 6 meshes with the gear-wheel 8 on the shaft 9. A crank 10 is mounted on the end ofgthe shaft 9, and said crank is connected by the pitman v11 with the crank 12 on the stub-shaft 15. Mounted on the stub-shaft 15 is the ratchetwheel 14 with which the pawl 13, mounted on the crank-arm 12, engages, and by means of which an intermittent movement is imparted to the shaft 15.

A bevel-gear 16 on the stub-shaft 15 meshes withthe bevel-pinion 17 on the shaft 18. A gear-wheel'19 on the shaft 18 meshes with the pinion 20 on the shaft 21, and a gear-wheel 22 on said shaft 21 meshes with the pinion 23. Mounted on the shaft 21 is the pinch-wheel 21 which, in conjunction with the lower pinch-wheel 25 mounted on the shaft 24, feeds the threading or tie-wire B, as will more fully hereinafter appear. A gear-Wheel 26 on the shaft 27 meshes with the gear-Wheel 7 on the shaft 6 to drive said shaft 27, and a pinion 28 on said shaft 27 meshes with the gear-wheel 29 on the shaft 30. A pinion 31 on the'shaft meshes with the spur-gear 32 mounted on the arm 32", said arm being adjustable to provide for mounting gears of different size thereon to controlthe lengths'of the fabric, as'will more fully hereinafter appear.

The spur-gear 32 meshes with the earwheel 33 mounted on the shaft 34. gains 35 are secured to the shaft 34, said cams having. the camways 35.

Upright bars 36 are pivoted at their lower ends at 37, and at the upper ends of said bars are the rocking-arms 38 or pullers mounted on a cross rail 36 which connects said arms; said pullers being pivoted on ins 39 to a plate 36 mounted on said rail. S pringS 40 are interposed between said rocking arms and the plate 36. The rail and arms form an oscillatory frame G. The rocking-arms 38 are'provided with the hook-portions 38 which are adapted to engage the stay-wires C of the wire-fabric,

which is made up of the said stay wires C and the strand wires D, said fabric being formed in a roll E, and drawn from said roll to the machine, as will more fully hereinafter appear.

To impart an oscillatory movement to the frame G, and consequently to the rockingarms 38 to feed the fabric to the machine, cams 41 are mounted on the shaft 6, and said cams engage the idle rollers 36 on the bars 36. Springs 42 (see Fig. 2) connect said bars with the frame, and return said bars to normal position.

Longitudinally extending bars 44 are pivotally connected, as at 44, to.the upper ends of bars 43 pivotally mounted on the rod 37. The outer ends of the longitudinally extending bars 44 have notches formed therein to form shoulders 44". Secured to the bars 44 are the blocks 45 having the faces 45 which are engaged by the peripheries of the cam discs 35, and by means of which said bars 44 are normally held up so that their shoulders do not engage the projections 46 on the.

pins 47 which connect the toggle arms 48, the lower ones of which are pivotally mounted on the frame, as at 49, and the upper ones pivotally connected at 50 to the cutter blocks 51 mounted in suitable guides in the frame. A cutter-bar 52 is carried by the cutter-blocks 51 which cooperates with a stationary cutter-bar 53 mounted in cutterblocks 54 on the frame.

. Cams 57 and 58 are mounted on the shaft 6, and said cams are arranged so that the cam 57 will act slightly in advance of the cam 58, and the cam 57 engages one of the bars 43 at one side of the machine while the cam 58 engages the bar 43 at the other side of the machine. In this manner. when the camways 85 of the cams 35 come around in position where the blocks 45 drop into said camways, the shoulders 44 will come down into position to engage the projections 46 upon the next forward movement of the bars 44 and the toggle-arms 48 will be straightened out so as to move the cutter-blocks 51 upwardly to cut the fabric. By having the cams 57 and 58 engaging the rollers of the bars 43 one ahead the other, the bar 44 on one side will act slightly in advance of the bar on the other side, so that the cutter-bar 52 will be raisedinto cutting position on one side, followed by the upward movement of the cutter-bar on the other side, so that the cutting action -does not take place all at one time and the strain on the cutter-bars is relieved.

The numeral 59 designates a stationary member or cross-rail, and 60 is a movable cross-rail adapted to be moved to and from said stationary cross-rail. The movable cross-rail 60 is mounted on slide-blocks 61 which are moved u and down by a toggle comprising the

togg e-arms

62 and 62. The

Lessee? upper toggle-arm 62 is pivotally connected at 63 to said sliding-block, and the lower tog- I gle-arm 62 is pivoted to the frameat 64. A roller 65 is mounted at the connecting point of the toggle-arms, and said roller is engaged by the cam 66 mounted on the shaft 27.

The cross-rails 59 and (30 are slotted as at (37 and (37 (see Fig. 4) to receive the former-

blocks

68 and 68, respectively. The upper forn'ier-blocks 68 are provided with the recesses 69, and the lower former-blocks 68* are provided with the correspondingly shaped projections 70 adapted to enter said recesses, and said projections 70 have the recesses '70 formed therein.

The upper cross-rail 59 has the longitudinally extending groove 71 formed therein, and the lower edges of said groove between the former-blocks has the inclined faces'73. Just beyond each former-block 68 the groove 71 has the beveled portion 71 which act to deflect the tie-wire B in case it should extend upwardly at its forward end and direct it accurately through the crimps, as y will more fully hereinafter appear. The movable cross-rail 60 has its upper surface beclines act to deflect the tie-wire B should itextend downwardly at its forward end, and guide it accurately through the crimps.

A pair of rocker-

arms

78 and 78 are mounted'on the rocker-shaft 7 8 mounted in suitable bearings 7 8. The rocker-arm 78 has secured at its lower end the cutter 7 6 which is adapted to cut the tie-wire after it has been fed the proper distance, as will more fully hereinafter appear.

The lower cross-rail 60 has the folder arms 83 pivotally mounted thereon at 83, the lower ends of said folder-arms being connected by the spring 83 which acts to hold said folder-arms normally in a vertical position, as shown in Fig. 4. The upper ends of the folder-arms are adapted to engage the projecting ends of the tie-wire and bend them upwardly into the position shown in Figs. 8 and 11 when said lower rail rises, and in order to bend the wire over into the position shown in Figs. 10 and 12 to complete the loop, the rocker-arms ,7 8 and 7 8 are each provided with the fingers 82 having angular nose portions or cams 82 which engage the rear of the folder-arms, as shown in Fig. 16, and cause said folder-arms to pivot inwardly, as shown in Fig. 12, thus bending the upwardly projecting end of the tie-wire into a loop around the crimp. In order to support the tie-wire in the forming of this loop, anvil blocks 82 are provided which are carried by a bracket 60 on the lower cross rail 60.

To provide for the rocking of the rockshaft 78, the arm 79 is connected to said shaft and the inner end of'said arm is conre ease? for the throw of the crank, and imparts only a slight movement to the arm 79, or just sufficient movement to permit the

rocker arms

78 and 78"" to perform their proper functions.

Just beyond the pinch-

rolls

21 and 25 is the guide 84 through which the tie-wire B passes, and a supplemental guide 85 is provided just beyond said guide 84:, said supplemental gulde 85 being shorter than the first-named guide, and is readily replaceable in case it wears out.

Straightening rolls 86, 87 and 88 are provided for straightening the fabric as it comes from the roll E, so that it will be delivered flatwise to the machine.

Above the'straightening rolls, carried by the housin 89, is the roll 90 of paper or other suita' le material. A. shaft 91 passes through the central opening 92 in the roll, and said shaft rests in forked bearings 93 in said housings. Mounted on the shaft 91 are the square tapering plugs 94 which are driven 'into the] ends of t e roll and are then secured to said shaft by the set screws 95.

Just in front of the straightening rolls are the guides 96 which are secured to the frame by bolts 97, saidguides being spaced at thesame-distance apart as the strand wire D of the wire-fabric. and said guides are provided with the notches 98 which are adapted to receive the strand-wires after the stay-wires C have passed over said guides, and in this way the accurate feedin of the wire-fabric to t e machine is insure [The operation of the machine is as follows:

Power is applied through the shaft 2 to the pulleys 3 and the wire-fabric is unrolled from the roll E and passed through the straightening rolls 86, 87 and 88 until said fabric is in position to be engaged by the pullers 38. The pullers, having been brought into engagement with one of the stay-wires C of the wire-fabric,-the bars 36 are moved to the left and the fabric is pulled through the machine. This is an intermittent action, as the bars 36 oscillate, and the pusher in movin to the right. yields so as to allow the hoo 38 to engage the staywire, as clearly shown in Figs. 1 and '13. In this manner the fabric is advanced the distance between the stay-wires C at each operation of the puller.

Each time the fabric comes to rest the lower cross-rail 60 is elevated by the action of the cam66 on the

toggle arms

62 and 62 and as said cross-rail rises it forms with the upper cross-rail 59 the crimps 100 in the strand-wires of the fabric by reason of the formers it) entering the recesse 71. Just as soon as the crimps 100 are formed the tie-wire C is advanced by the pinch rolls 21 and 25, and said tie-wire advancing through the guides 84' and 85 enters the groove 71 in the upper cross-rail 59. and in case said wire should be bent slightly upward at its outer end it will strike the beveled face 71 and will be directed straight through the groove and through the crimps 100, or in case the wire should be bent downwardly it will strike the beveled *faces 72 of the lower cross-rail 60,- and will be directed thereby in a straight direction through the groove 71, so that there Will be no liability of the tie-wire missing the crimp and being obstructed so a to prevent the successful operation of the machine.

It should have been stated that the paper F from the roll 90 passing between the tension rolls 101 is arranged between the crossrails 59 and 60, so that as the lower crossrail is raised the crimp 100 is formed and by the formation of this crimp the paper is also perforated, and when the tie-wire passes throughthe' crimps, as above described, it

passe abovethe paper, acting to tie or secure the paper to the fabric.

- At the same time that the lower cross-rail is raised to form the crimp the folder-arms 83 engage the underside of the projectin ends of the preceding tie-wire and hen said ends upwardly in the position shown in Fig. 10, whereupon the rocker shaft 78 is rocked by the action of the pitman and the arms 78- are moved in toward the cross-rails, said arms carrying the fingers 82 with the cam portions 82 which engage the rear of the folder-arms 83 and causes said folder-arms to pivot inwardly, as shown in Fig. 11. thus bending the upright projecting end into a loop around the crimp on the anvil-block 82".

In thi manner the fabric is fed forward by an intermittent movement, and at each rest period the crimps are formed and the paper perforated and the tie wire passed through the crimp to secure the paper, while at the same time the ends of the preceding tieflvire are bent over in the. form of a loop around the outside crimps.

The cutting of the fabric into lengths is accomplished by the

knives

52 and 53, and as above stated, provision is made for the operating of one end of'the knife 52 before the other end by the action of the cams 57 and 58 in advancing the bars 44, the one slightly ahead of the'other, which will cause the above-described action of the cutter bar. It is-appa-rent that instead of perforating the paper by means of the crimps the paper might be previously perforated and brought into interlocking engagement with the crimps.

What I claim is:

1. In apparatus for attaching sheet-material as a backing for wire-fabric, the combination with a suitable frame, of means for advancing the fabric, means for forming crimps in the strand-wires of the fabric, means for applying the sheet-material, whereby it is perforated by said crimps, and means for threading a wire through said crimps.

2. In apparatus for attaching sheet-material as a backing for wire-fabric, the combination with a suitable frame, of means for advancing the wire-fabric, intermittently. means for forming crimps in the strand-wires of the wire-fabricymeans for applying the sheet-material, whereby said material is perforated by said crimps, and means for threading a wire through said crimps. v

3. In apparatus for attaching sheet-material as a backing for wire-fabric, the combination'with a suitable frame, of a reciprocating uller adapted to enga e the staywires 0 the fabric to advance t e same, intermittently, means for forming crimps on the strand-wires, meansfor applying the sheet-material, whereby said material is perforated by said crimps, and means for threading a wire through said crimps.

4. In apparatus for attaching sheet-material as a backing for wire-fabric, the combination with a suitable frame, of a yieldingly mounted reciprocating puller adapted to engage the said wires of the fabric to impart an intermittent movement to said fabric, means for'forming crimpsin the strand-wires of the fabric, means for applying sheet-material, whereby the said material is perforated by said crimps, and means for threading a wire through said crimps.

5. In apparatus for attaching sheet-material as a backing for wire fabric, the combination with a suitable frame, of an oscillating frame mounted therein, means for'oscillating said frame, a yieldingly mounted puller mounted on said oscillating frame adapted to engage the stay-wires of the fabric to impart an intermittent movement thereto, means for forming crimps in the strandwires of the fabric, means for applying sheet material, whereby the material is perforated by said crimps, and means for threading a wire through said crimps.

6. In ap aratus for attaching sheet material as a acking for wire-fabric, the combination with a suitable frame, of an oscillatory spring-actuated frame, a cam engaging said frame, a yieldingly mountedpuller on said oscillatory frame adapted to engage the stay-wires -of the fabric to advance the same intermittentl means for forming crimps in thestran means for applying. sheet-material, whereby said material is perforated by said crimps,

-w1res of the said fabric,

insane? and means for threading a wire through said crimps.

. 7. In apparatus for attachingsheet material as a acking for wire fabric, the combination with a suitable frame, of a yieldingly mounted puller having a hook portion adapted to engage a stay-wire of the .fabric, means for reciprocating saidpuller to impart an intermittent movement to said fabric, means for forming crimps in the strandwires of said fabric, means for applying sheet-material, whereby said material is perforatedby said crimps, and means for threading a wire through said crimps.

8. In apparatus for attaching sheet material as a backing for wire-fabric, the combination with a suitable frame, of means for advancing the wire-fabric, means for forming crimps in the strand-wires of said fabric, means for applying sheet-material, whereby said material is perforated by said crimps, means for threading a wire through the crimps, and means for severing said threading wire.

9., In apparatus for attaching sheet material as a backing for wire-fabric, the combination with a suitable frame, of means for advancing a wire-fabric, means for forming crimps in the stay-wires of said fabric, means for applyingsheet material, whereby said material is perforated by said crimps, means for threading a wire through said crimps, and means for folding over the ends of said threading wire.

10. In a paratus for attaching sheet-ma terial as a acking for wire-fabric, the combination with a suitable frame, of means for advancing the wire-fabric, means for forming crimps in the strand-wires of said fabric, means for applying sheet-material, whereby said material is erforated by said crimps, means for threading a wire through said crimps, and means beyond said crimping, means for folding over the ends of said threading wire.

11. In apparatus for attaching sheet-material as a backing for wire-fabric, the combination with a suitable frame,'of means for advancing the wire-fabric, members having crimping dies movable the one with reference to the other,

in the strand wires of said fabric, means for whereby crimps are formed V applying sheet material between said memhers, whereby said material is perforated in the forming of the crimps, and means for threading a wire through said crimps.

12. In a paratus for attachin terial as a tacking-for wire-fabric, the combination with a suitable frame, of means for advancin the wire-fabric, an upper stationary mem er having a longitudinally extending groove formed therein, and crimp-forming notches, a lower movable member having projections adapted to enter said notches,

said projections being -recesseiil, means vfor sheet ma-J ins-ease? applying sheet material between said movable members, means for raising said lower member, whereby crim s are formed in the strand-wires of the fabric, and said sheet material perforated, and means for threading a wire through the crimps formed by said movable members. v

13. In a paratus for attaching sheet material as a acking for wire-fabric, the combination with a suitable frame, of means for advancing the wirerfabric, a stationary upper member having a longitudinally extendin groove and crimp-forming notches formed at intervals therein, a lower movable member having rojections coinciding with said notches, said projection being recessed, means for applying sheet material between said members, means for raising said lower member, whereby crimps are formed in the strand-wires of said fabric,

and said sheet material perforated thereby, means for threading a wire through said crimps, and folding means carried by said movable member in advance thereof adapted to engage the ends of the preceding threading wire.

14. In a paratus for attaching sheet material as a backing for wire fabric, the combination with a suitable frame, of means for feeding the wire fabric, a stationary memher having a longitudinally extending groove and crimp-forming notches formed at intervals therein, a movable member having projections coinciding with said notches, said projections being recessed, means for applying sheet material between said mem bers, means for raisin said lower member, whereby crimps are ormed in the strand wires of the fabric and said sheet material perforated thereby, means for threading a wire throu h said crimps, a pivotally mounted foIder carriedv by said movable member in advance thereof adapted to engage the projectin ends of the preceding threading wire, and means for moving said folder on its pivot to bend said projecting ends inwardly.

15, In a paratus for attachin sheet material as a backing for wire fabric, the combination with a suitable frame, of means for advancing the wire fabric, a stationary member with a longitudinally extending groove formed therein and crimp-forming notches at intervals, a movable member having projections coinciding with said notches, said projections being recessed, means for applying the sheet material between said mem ers, means for raising said movable member whereby crimps are formed in the strand wires of said fabric, and said sheet material perforated thereby, means for threading a wire through said crimps, pivotally mounted folders carried by said movable member adaptedto engage the projecting ends of the preceding threading wire, rocker members mounted in said frame having cam portions adapted to engage said folders to move said folders inwardly on their pivots to fold over said projecting ends of the threading wire, and means for operating said rocker members. v

16. In apparatus for attaching sheet material as a backing for wire fabric, the combination with a suitable frame, of means for advancing the wire fabric, a stationary member having a longitudinally extending groove, and notches at intervals adapted to receive crimps on the strand-wires, the portions of said groove between said notches having beveled faces just beyond said notches, a movable member having projections coinciding with said notches, said projections being recessed, said movable member having angular inclined faces between said projections and inclined faces on the upper member with which the inclined faces on the lower member engage, means for applying sheet material between said members, means for raising said lower member, whereby said sheet member is perforated b said crimps, and means for directing a t reading wire through said crimps when said lower member is raised.

17. In a paratus for attaching sheet material as a backing for wire-fabric, the combination with a suitable frame, of means for advancing the wire-fabric, a stationary member having a groove extending longitudinally thereof, and notches at intervals adapted to receive crim s on the strandwires, a movable member aving projections coinciding with said notches, said projections being recessed, means for applying sheet material between said members, a toggle connected to said movable member, a

shaft, a cam on said shaft enga ing said toggle, means for feeding a threa ing wire through the crimps formed by said members, pivotally mounted folders carried by said movable member in advance thereof adapted to engage the projecting ends of the preceding threading wire, rocker members, a rocker shaft, a pit-man connected to said first-named shaft having a slot formed therein, an armconnecting said rock shaft with said pitman, said arm engaging said slot, and a cam carried by said rocker member adapted to engage said folder to move the same on its pivot over in folding position.

18. In aparatus for attaching sheet material as a acking for wire fabric, the combination with a suitable frame, of means for advancing the wire fabric, means for forming crimps in the strand-wires of said fabric, means for applying sheet-material,

whereby said material is perforated by said crimps, means for threading a wire through ltd ' crimps, a

said crimps, and cutting mechanism beyond "said crimp-forming means for cutting the fabric into lengths.

19. In apparatus for attaching sheet material as a backing for wire fabric, the combination with a suitable frame, of means for forming crimps in the strand-wires of said fabric, means for applying sheet material, whereby said material is perforated by said crimps, means for threading wire through said crimps, cutter-mechanism for cutting said fabric into suitable lengths, comprising a stationary and a movable knife, means for elevating one end of said knife and then raising the opposite end.

'- 20. In apparatus for-attaching sheet material as a backing for wire fabric, the combination with a suitable frame, of means for advancing the wire fabric, means for forming crimps in the strand-wires of said fabric,

means for applying sheet-material, whereby said material is perforated by said crimps, means for threading a wire through the reciprocating bar, cutting mechanism for cutting the fabric into lengths comprising a stationary cutter bar and a m'ovable cutter bar, a toggle connected to said movable cutter-bar, said reciprocating bar bein normally out of engagement with said togge, and means for bringing said bar into engagement with said toggle to operate same to raise said movable cutter-bar.

2].. ln apparatus for attaching sheet materialas a backing for wire fabric, the combination with a suitable frame, of means for advancing the wire-fabric, means for forming crimps in the strand-wire thereof, means for applying sheet material, whereby said material is perforated b said crimps, means for threading a. wire tirough said crimps, cutting mechanism for cutting said fabric into lengths, said cutting mechanism coinprising astationary cutter bar and a movable cutter bar, a. toggle connected to the said movable cutter bar, a projection at the toggle joint, a reciprocating bar having a shoulder normally held out of engagement with said projection, a cam engaging said reciprocating bar having a camway whereby said bar is lowered to bring said shoulder into engagement with said projection to opcutting mechanism A toggle arms,

31 Add ,837

(grate said toggle to raise said movable cutter- 22. In apparatus for attaching sheet material as a backing for wire fabric, the com.- bination with a suitable frame, of means for advancing wire fabric, means for forming crimps in the strand-wires thereof, means for applying sheet material, whereby said material is perforated by for threading a wire through sai crimps,

for cutting the fabric into lengths comprising a stationary cutter bar and a movable cutter bar, toggles connected to said movable cutter-bar having projections at the points of connection of the longitudinally extending bars having shoulders normally out of engagement with said projections, cams engaging said longitudinally extendin bars, having camways to permit said shou ders to engage said projections, the ends of said bars being connected independently to pivotally mounted upright members, and cams adapted to engage said members to advance said bars, said cams being ofiset with relation to each other, whereb one of said bars is advanced slightly in a Vance of the other, whereby one end of the movable cutter bar is raised previous to the other.

23 In apparatus for attaching sheet material as a backing for wire fabric, the combination with a suitable frame, of means for advancing the fabric, means for forming crimps in the strand wires of the fabric, means for applying the sheet material, whereby-it is perforated by the crimping operation and means for threading a wire through said crimps.

24. In apparatus for attaching sheet material as a backing for wire fabric, the combination with a suitable frame, of means for advancing the fabric, means for forming crimps in the strand wires of the fabric, means for bringing the sheet material into interlocking engagement with said crimps, and means for threading a wire through said crimps.

lln testimony whereof l, the said GEORGE E. Bonn, have hereunto set my hand. 1

GEURGE E. BULL.

sa l crim s, means ill)