US1756392A - Zigzag-pile-forming machine - Google Patents

Description

-Apl29, 1930. y w, H, SMm-l 91,756,392

ZIGZAG PILE FORMING MACHINE 4 fr0/VMM( April 29, 1930. w. H. SMITH ZIGZAG PILE FORMING MACHINE 5 Sheets-Sheet Filed Feb. 23, 1929 Z? ze April 29, 1930. w. H. SMITH 1,756,392

' zIGzAG PILE FORMING MACHINE med Feb. 23, 1929 5 sheets-sheet s (ff) ze "4@vg 75' 446, "4 4// u i Y .April 29, 1930. w.l|!. SMITH 1,756,392

ZIGZAG PILE FORMING MACHINE April 29, 1930. w. H. sMlTH 1,756,392

ZIGZAG PILE FORMING MACHINE Filed Feb. ,25, 1929 A 5 Sheets-Sheet 5 Patented Apr. `29, 1930 UNITED STAT-Es WALTER HAROLD SMITH, vor

TORONTO, ONTARIO, CANADA, ASSIGNORTO BUSINESS SYSTEMS LIMITED, OF TORONTO, CANADA, A CORPORATIONOF CANADA ZIGZAGQPILEFORMING MACHINE Application ined February 2s, 192e. serial No. 342,255. l

My invention relates to improvements in zigzag pile forming machines, andthe obj ect of the invention is'to devise a machine which will rapidly form a ypaper strip hereinafter 1,5 referred to as theY web Yintoa `zigzag pile, at the same time accurately spacing the crease lines `apart to y,produce folds of exactly equal length so that an accurately vertical pile is built up,and simultaneously press each fold together as it is jformed tonish such fold, and thereby dispense with any manual finishing after the pile is formed, the operation of the device resulting ina completely finished pile ready for use,

of the arrangementand construction of parts as hereinafter more particularly explained.

Fig. 1 is a perspective view of my zigzag pile forming machine.

Fig. 2 is a plan view of the machine shown '2o in Fig. 1 and showing the connection to the printing device from which the web is drawn. Fig. 3 is an end view of the pile forming mechanism, part of the framebeing broken away to exhibitthe construction thereof.

Fig. 4 is a sectional view through the centre of the pile forming machine and looking from the opposite side to that shown in Fig. 3.

Fig. 5 is a sectional view through the device taken betweenthe right hand 'end plate and 3c the feed rolls, the Lend plate being illustrated by dotted lines, the section being taken on line 5 5 Fig. 2.

Fig. 6 is a sectional view on line 6-6 Fig. 2. Fig. `7 =`s an enlarged sectional detail through the feed rolls, zigzag pile and adjacentmechanism. l

Fig. 8 is an enlarged perspective detail of the'p'ressure plate and operative parts coacting therewith.

Fig. 9 is a detail yview showing the bearing supports for the shafts of the combination feed and creasing rolls.

Fig. 10 is adetail view through one of the airsupply valves taken at right angles to the section shown in Fig. 6:

Y In the drawings like characters of reference indicate corresponding parts in each figure. l'indicates a portion of a printing machine through which ,the paper 'web 2 is passed for l the :purpose of printing the necessary details and it consists essentiallyy thereon. .3 and 4 are the side bars of the frame of the printing'machine which are extended rearwardly as indicated at 3* and 4 to form av support for my device, the extreme ends of the side bars being carried by legs 3 and connected together at the bottom by a cross bar 5. .6 and 7 are the side standard plates of my device provided with feet 6* and 7 X carried upon the sidebar extensions 3X and 4X. The standard plates 6 and 7 are connected together by tie rodsS and 9. 10 and 10x are supporting rods extending between the'front and rear portions of the standard plates 6 and 7. 11 and 12 are shafts journalled in the standard plates 6 and 7 and to which are secured the combination feed andy creasing roll ers'lS .and 14. The shaft 11 is kheld in a sta-- tionary bearing in the standard plates 6 and 7 and the 'shaft 12 in lspringipressed bearings 15, whereby the feedfroller 14 is resiliently forced towards the feedroll 13 so as t'o have a feeding grip upon .the web 2'which passes downward therebetween. The feed ' rollers 13 and 14 are provided with a series of'annular grooves 13X and 14X for a purpose ywhich will hereinafter appear.Y i

yThe feed rollers' 13 and V1,4 are provided on one side with V- shapedgrooves 16 and 16* and with recesses 160 and r161, the vrecesses 16 and 161 being diametricall'y opposite the grooves 16 and 16". Both the groovesand' recesses l'extend'longitudinallyl of the periphery of the rollers from end to` end. v

17 and 17 X are bars slidably fitting within the recesses 16"v and 161 so as to reciprocate -a short distance radially. The outer exposed face of each bar 17 yand 17 is provided with a V-shapedV rib A17'o extending` longitudinally thereof, the rib of each bar being adapted to enter the "V-shaped groove 16 or 16X as the rollers revolve.

Normally the edge of the 'V-shaped lrib 17 Ais within the periphery of the roller and whenmoved outward extends slightly beyond 1 such peripheryto enter .the vopposing groove 16er 16 for an instant as'the rollers revolve so as to pinch the web 2 into the \r''sh'apedy reces's'to form a'transverse crease across the web, such op'erationbeing 'performed justas the V-shaped groove straddles the line of grip on the web of the rollers 13 and 14.

It will be understood that as the feed rollers 13 and 14 revolve they draw the web 2 from the printing device, such draw tending to stretch the paper. It is, therefore, important that the crease line be formed at the line of grip so that in the act of forcing the paper into the groove it will not exert any eXtra stretch on the web between the feed rollers and the printing machine, the eXtra paper required to permit the forming of the crease being taken from the slack existing in the paper below the line of grip and not from the paper under tension above the line of grip. By this means no further stretch is given to the paper varying in amount according to the stretchability of the paper and therefore the distance between the crease lines is not affected by any variation of stretch in the paper, and thus insuring of each ply ofthe pile being exactly the same length to form a vertical pile as will hereinafter more clearly appear.

It will be readily understood that if the length of the plies varied each ply would slightly overhang the underlying ply at the line of fold carrying the corresponding pile face out of the vertical or to an inclined position. Y

In order to operate the bars 17 and 17X to crease the paper I provide the following device.

18 and 19 are a pair of cam plates'secured to the standard plate 7. The inner edges of the plates 18 and 19 are curved concentric to the periphery of the rollers 13 and 14 and are provided on their inner edges with small projections 18X and 19x.

v20 and 21 are rocking shafts which extend through the rollers 13 and 14 so as to be journalled therein. 22 and 23 are the arms of a double lever secured to one end of each Shaft 2O and 21. The arm 22 is provided with a roller 22X adapted to engage with the inner edge of the plates 18 or 19 as the roller 13 or 14 revolves. Each of t-he other arms 23 is connected by a curved link 23x to the corresponding end of the bar 17 or 17X, the link 23X being resiliently held by a tension spring 24 connected at one end to a pin 25 carried by the link 23X, and at the opposite end by a pin 26 extending from the roller 13 or 14.

It will, of course, be understood thatthe' opposite end of each shaft 20 and 21 is provided with a lever arm corresponding to the lever arm 23 connected by a link corresponding to the link 23X to the opposite end of the bars V17 and 1"".

It will thus be seen that as the feed rollers 13 and 14 revolve the rollers 22c are carried into engagement with the projection 18X or 19 so as to rock the rod 2O or 21, thereby swinging the lever arm 23 of each shaft 20 and 21 in a corresponding direction forcing the bar 17 or 17X very slightly outward, such operation being so timed that the corresponding groove 16 is brought into an opposing position to the rib 17 to enter it and pinch the interposed paper into a crease line.

27 and 28 are hangers carried by each rod 10 and 10". 29 is a rocking rod journalled in the lower end of each pair of hangers 27 and 28. 29X are stripper fingers extending at one end through the rocking rods 29 and secured therein by set screws 30.

The fingers 29x are so formed that when the rocking rods 29 are rocked so that their inner endportions travel'upward they are carried into the and 14.

The rocking action of thev rocking shafts 29 alternate one with the other so that the stripper lingers are alternately carried into this position. W'hen the stripper fingers are carried into this position they insure of the web being freed from the rollers so as to travel downward to `form the pile.

1 will4 now describe the mechanism by which the rocking rods 29 are alternately rocked. i

31 and-32 are cams secured to the shafts 1l and 12 of the feed rollers 13 and 14. 33 and are camlevers pivoted on a stud 35 extending from the standard plate .6. 36 and 37 are pins extended from the inner face of the levers 33 and 34 intermediately of their length and upon which are mounted cam rollers 38 and 39 which rest upon the periphery of the cams 31 and 40 is an arm secured to the end of each rocking rod 29, such arms being connected by links 41 to the corresponding ends of the levers 33 and 34.

As the cams 31 and 32 are oppositely set it will be readily seen that as they revolve they alternately raise and lower the cam levers 33 and 34, pulling alternately upon the links 4l to alternately raise the arms 40 and thereby alternately'rock the shafts 29, carrying the stripper lingers 29X alternately into engagement with the feed rollers 13 and 14 to strip the paper therefrom. In order that this mechanism `is returned to its normal position after each operation each shaft 29 is provided with an outwardly extending arm 42 connected by a tension spring 43 to the rod 10 or any other suitable point of connection.

Upon referring to F ig. 7 it will be clearly seen that as the web 2 travels downward from between the feed rollers 13 and 14 it tends to fold upon Athe transverse crease lines so as to fall alternately in opposite directions from one side tothe other of the pile 44.

45 and 46 are hangers also carried by the rod 10. 47 is a rocking rod journalledY in the lower and of each pair of hangers 45 and 46. One end of each rocking rod 47 is provided with an arm 48 connected by a tension spring 49 to any suitable point of attachment such as the shaft 10. v50 is a sleeve secured to each grooves 13X and 14x of the rollers 13 v leg 40.

` nately operate the bell crank 79 so as to al? rocking shaft 47, each sleevebeing provided with arms 51 and v52. 53 is a rocking rod journalled in the upper end of veach pair of arms 51 and 52 54 and55 'are pressure plates adapted to exert pressure on the edge of the pile over each fold Each pressure plate isr X lcarriedfby the rocking shaft 47 z 61 are front and rear vertical :guidebars kbetween which the pile 44 is built up. 62 is a pile supporting table supported on anarm 63 carried by a slide 64 slidably mountedona depending '65 is aV feed screwmounted in bearings 66 and 67. 68 isa divided nut, the members of which ment with the thread of the feed :screw 65.

69 is a pawlcarrier rotatably mounted on the upper end ofthe feed screw 65, and 70 is a ratchet secured to the -feed screw and with which the pawl711c0a'c`ts to 4rotate the feed;v

screw. 72 isa rota-ting y'member of the printing-device 1. f.

73 is a rocking shaft journal'led in the 'side bar 3)X of the main frame to which arms 74 The arm 74 is vconnected a linlr 76 to al crank vpin 77 carried eccentrically by-the rotating member 72. The arm is connected by alinkf'f'G toa-pi'n-775 depending from the pa'wl carrier'69.. As ythe member 7 2' yrotates the yl-inlr 7 '6 is reciprocated rocking the shaft 7:8 and-swinging the arms 74 and 7 5l alternately finopposlte directions so as)toreciprocate'the link-76X and thereby rock the pawl carrier 69 Aaround its vertical axis and Ithereby rotatethe'feed screw by means of lthepawl`71-and vratchet 70. Byr

this means kthe nut 68gis carried'downward so as to gradually 'feed the pile supporting.

table 62 downwardasthe pif-le is built upsoas to maintain the upper face Vof the pile at a constantlevel. 1

j ln yorder'to rock the shafts 47 I vprovide cams 78 and 7 8 which are oppositely set and respectively secured to the shafts 11 and 12 of the feed rollers '18 and 14.v

79 is a bell crank vmounted in each rod 10v and 10X. The'arin- 79X .of each vbell cran-k is 3ro-vided with a cam roller 7 9 coactino` with v v I r.:

cam 8. or 18X.- 80 1s an the corresponding arm secured to each rocking shaftl. AThe arm 80 is connected by a link .81 to the other arm 7 9*of each bell icrank 79.. n;

.as the cams' 7 8f and 7 8 revolve they alterternately rock the shafts 47 and thereby swing the arms 5 1 rand 52 alternately inward and outward ateach'side `of the machine.

are held by gravity inengage-k v82 isa bar member carried by one of the vertical bars 61. The bar members `82 are provided with lateral projections 82 and 82, the proj eetion 82X preferably carrying asct screw 83. The projection 82X-and the inner end of the set'screw 83 are directly in the path of travel of the lower end of the arm 57 of the pressure pla- te 54 or 55.

As the arms 51 and 52 travel inwardtowards the pile the arm 57 is brought into .engagement withr the lateral projectionY 82X so that sucharm is swung outward at its lower end forcing theinneredge portion of the pressure plate 54 downward against the upper face of the pile as shown in Fig. 7. lh-en the arms 51and ward away from the pile the pressure plate 54 or 55'isr held in the same relative position to the arms 51 and 52 during its outward swing, thereby'meeting the folded paper forcing it towards Vthe descending stripper fingers 29X so as to exert' a slight gripv on the foldl and pinch' it along the line of fold.Y vThe moven ment then carries the pressure 'plate clear of the pile and as the arm" 57 engages the ,set

of the plate passes over the last fold'made which has now become the top of the'pile so that the plate` in its final inwardr position presses down the top fold onto the pile and thereby exerting pressure upon the whole pile.

.'When coniparative'lytstiff or heavypaper j is being folded into a zigzag pile the paper itself will'naturallyfold on its crease lines alternately'in opposite directions as the pile is being formed.

l/Vhen, however, verylight paper similar rto tissue' paper is used supplementalmeans has' to be provided to insure of the paper folding alternately in opposite directions on its crease lines. To do this Iprovideth'e following device. f

86' is aV main air supply pipe leading to a v88 and 89 are branch pipes leading from the arms of the T. 90 and 91 are valve blocks carried upon a rod 92 supported by a cross bar 98 on the mai-n frame of the machine.v Each block 90 and 91 is provided with a down'- wardly yextending bore 922. 94 is a sleeve fitting in each bore 92X and is provided with diametric orifices 95 and 96. 97 and 98 are orifices formed in the valve block in align with the orifices 95 and 96. 99 and 100 are nipples secured in the orifices 97 and 98 at oneend, the pipes 88 Aand 89 being connected to the nipples 99- 101 are pipes leading from the nipples 100. 102 are tubes supported Yby `a rod 10. The tubes 102- are providedwitha line of perforations 104 through which air is impelled from each side of the machine to carry the web 2 alternately from one side of the pile to the other to insure that the folds are made. 105 is a piston operating within' each sleeve 94 and provided with a piston rod 106 spring pressed in its upward position by a spring 107 bearing at its lower end against the valve block 90 and at its upper end against a washer 108 secured to the piston 106. Each piston rod 106 is provided with an enlargement 106X which lits the interior of the cylinder 94 when the piston is depressed so as to form an air space for the passage ofair between the perforations 97 and 98. The upper end of the piston is located directly beneath the link 81 at each side of the machine.

It will therefore be seen that each time one of the links 81 is carried downward during the operation of the machine that a piston rod 106 will be engaged thereby, and the piston 105 forced downward so as to permit the passage of air passing alternately from the pipe 88 or 89 through the valve Vbloclr 90 or 91 into the sleeve 94 and out through the orifice 98 and nipple 100 through the pipe 101 to the respective perforated air tube 102.

Having described the principal parts involved in my invention I will briefly describe Vthe operation of the same.

The paper strip or web 2 is drawn from the printing machine by means of the revolving feed rollers 13 and 14. As the web passes between .the rollers the coacting ribs and i grooves 17o and 16 crease the paper on alternate sides at equally spaced apart positions. As the rollers continue to revolve the web is carried downward tending to follow the dott-ed line position A in F ig. 7 beneath the roller 14.y The stripper fingers 29 on the corresponding side of the machine at this point of the operation of the machine'are in engagement with the roller 14 within the grooves 14X and the ends of the ngers serve to prevent the web clinging to the roller and it assumes the full line position shown at A1 in this figure. As it passes downward it foldsV upon the crease line at B gradually assuming the dash line position C as the web continues to feed down, together with the fingers 29X. As the fingers assume this intermediate position the corresponding lingers beneath the roller 18 also assume an intermediate position travelling upward towards the roller 13. As the fold is made the fingers beneath the roller 14 finally assume the dotted line position D.

When in this position the ngers beneath the roller 13 have come into engagement with such roller and as the web continues further toy feed down between the rollers 13 and 14 it is creased on the opposite side to the crease at the point B and gradually assumes the position E folding on the crease line at F beneath the raised lingers contacting with the roller 13. The lingers beneath the roller 13 then descend as previously described in connection with the fingers beneath the roller 14 to make the fold on the opposite side of the paper. During this operation the pressure plates 54 and 55 bear against the upper face of the pile over the folded edges of the web, and as each vfold is made the pressure plate is withdrawn from beneath the fold and as it is withdrawn it has an upward movement against the lower face of the fold so as to pinch the fold between itself and the descending stripper lingers as they assume the position D. By thecontinued upward movement of the pressure plates as hereinbefore described they are carried clear of the fold and the underlying pile and as they assume their eXtreme outward position they are tilted upward as indicated by dotted lines G in Fig. 'l' so'asto insure that when the pressure plate returns it passes over and comes into bearing .position upon the last fold made pressing it down upon the top of the pile and holding it in this position until the next fold is made, this operation taking place alternately on each side of the pile as one fold is laid upon the other. As the pile is made and fold is laid upon fold the pile is automatically fed downward by the feed screw 65 so that the upper face of the pile remains in a constant position in relation to the folding mechanism.

What I claim as my invention:

l. In alzigzag pile forming machine, a pair of web feeding rollers each provided on its periphery with a longitudinal groove and with a diametrically opposite longitudinal and radial recess, a bar member movable radially in each recess, a creasing rib on the outer face of each bar normally within the periphery of the feed roller, and means for automatically carrying the bar outward as the rib and corresponding opposing groove come to a meshing position as the rollers revolve, whereby the web interposed between the feed rollers is pinched into a crease,

. 2. In a device of the class described, a pair of web feeding rollers each provided in its periphery with a longitudinal groove and to which rollers the web passes under tension to the upper side of the groove as such groove Comes to the creasing position and from which point the slack of the web depends, a bar member carried by the roller and extending longitudinally of the periphery thereof and movable radially, and a creasing rib carried by the outer face of the bar member and adapted to enter the aforesaid groove to force web slack thereinto to form a crease.

3. In a zigzag pile forming machine, a pair of web feeding rollers each provided in its periphery with aV longitudinal groove and with a diametrically opposite and longitudinal recess, a bar member movable radially in each recess, a creasing rib in the outer face ifif'rsaeez f of each bar member and normally within the web --periphery of'the'ffeedingroller, and cam toperated 'means for carrying the bar f outward as thefribfand correspondingopposinggroove come yto meshing position-as the rollers revolve, wherebythe web linterposed between the feed rollersis pinched into a crease.v

'4. In a device of the class described, apair of web feeding rollers each provided .in its periphery with a longitudinal rgroove and with a diametrically opposite longitudinal and radial recess, -a bar member spring held i i y shafts at each side of the pile support and `feed V rollers, means forrocking the shafts, stripper in its normal position in each recessya creasing rib in the outer face of each bar and movable within .theperiphery ofthe feed roller,

and means for automatically forcingthe bar `momentarily outward as the rib and correspending` opposinggroove come to a meshing position as the rollers revolve, whereby the interposed between Vthe Vfeed rollers is pinched into a crease.

5. 'In a zigzagpile forming machine, a pair of web feeding rollers each provided in its periphery with a longitudinal groove and with a diametrically opposite longitudinal and radial recess, a bar member movable radially in each recess and carrying a. creasing rib, a stationary cam plate adjacent each roller having a surface concentric thereto and provided with a projection extending from its concentric surface, a cam lever pivoted on each feed roller, a'cam roller mounted on each lever and spring held in the path of the aforesaid projection, and means operated by the cam roller as it engages the aforesaid projection for forcing the creasing rib outward as I it travels into a meshing position within the groove of the opposing roller.

6. Ina zigzag pile forming machine, a pair of web feeding rollers, means for creasing the web on alternate sides at equally spaced apart positions as it passes between the feed Y rollers, a pile support located beneath the feed rollers, stripper fingers pivotally mounted at each side of the pile support and extending at their ends beneath the corresponding feed roller, means for alternately reciprocating the lingers on their pivot and alternately into contact with the feed rollers and upper face .50 of the pile, and means coacting with the stripper lingers for pinching the sides of each fold together as it is laid on the pile.

7 .l In a zigzag pile forming machine, a pair of web feeding rollers, means for creasing the web on alternate sides at equally spaced apart positionsras it passes between the feed rollers,

a pile support located beneath the feed rollers, kstripper fingers pivotally mounted at each side of the pile support and extending at their ends beneath the corresponding feed roller, means for alternately reciprocating the ngers on their pivot and alternately into contact with the feed rollers and upper face of the pile, means coacting with the stripper fingers for pinching the sides of each foldgtogether vas it .is laidon `the ournalled in pile and'for eX- erting pressure 'against the Vpile -top over the folded edges,l and means for withdrawing suchlpressure means 'as each fold ,is laid on the l,pile topv and returning itonto the top of the new made fold.

8. In a zigzaglpile forming machine, a pair of web feeding rollers, a pile support-.onto

which the' webfis fed bythe rollers, means for creasing the -web on alternate sides so as to assume a zigzag fold to form the pile as'it is fed kronto the support, upper and lower rock lingers carried by each yupper rock'shaft and coacting with their adj acentfeed rollers,'and pressure lplates carried by the lower y shafts and adapted to coact with the stripper lingers to pinch each fold togetheras it is formed and to independently eXert pressure on the pile top over the folded edges. y 1

9, In a--zigzag pile formingfmachine, a pair of shafts 'driven from a suitable source AVand suitable bearings, a web feed roller secured y onto whichthe web is fed, meansfor creasing vthe `web on alternate sides as it is fed to the support so vas to fold alternately in opposite directions on the support to form the pile,

'upper and 'lower rock shafts located-at each side of the :pile support and feed rollers, stripper rfingers carried bythe upper rock shaft coacting with the adjacent feed roller,

pressure plates .carried by the lower rock .shaft adapted to coact with the descending stripper fingers to pinch Veach fold as'it is made and to then bear on the top vof each completed fold `on the pile top, and cam operated mechanism driven from the shafts of the feeding rollers 'for alternately rocking the rock lshafts on each side of the pile.

Y10. In a zigzag pile forming machine, vthe .combination with a pile support and means 'for zigzagging a web strip toforma pile Aon the support, of a pressure device at each side of the support each comprising a pressure platenormally bearing against the upper face of a pile carried on the support,.means Yfor withdrawing the plate as each fold is made, and means for elevating the inner edge of the l.plate so as to ,pass `vover each new :made fold yas it returns to its bearing position Von the upper face of the pile. f

ll. In a zigzag pile forming macy ine, the

combination with a pile support and means for zigzagfring-a webstrip to forma pile on the supp'ot, of a pressure device at each side of the support each comprising a pressure plate normally bearing against the upper face of the pile, means for withdrawing the plate as each fold is made, means for elevating the inner edge of the plate so as to pass over each new made fold as it returns to itsy bearing position on the upper face of lthe .plaand means lcoacting with .the presto each shaftfa pile support iis sure plate for pinching together each fold of the web as the plateV is withdrawn.

12. In a zigzag pile forming machine, the

Acombination with a pile support and means for zigzagging a web strip to form a pile on the support, of a pressure device at each side of the support each comprising a rock shaft journalled in suitable bearings, a pair of radial arms carried by the rock shaft, means for rocking the shaft to carry the arms outward and inward as each fold is made, a pressure plate tiltably carried between the arms, spring means resisting the tilting movement of the plate as it is swung outward, and means for tilting the plate upward at its inner edge as it is carried to the extreme outward position to pass Vover. a new made fold on the pile Vtop on its return movement.

13. In a zigzag pile forming machine, the combination with a pile support and means for zigzagging a web'strip to form a pile on the support, of a pressure device at each side of the support each comprising a rock shaft journalled in suitable bearings, a pair of radial arms carried by the rocking shaft, means for rocking the shaft to carry the arms outward and inward as each fold is made, a rod held in the outer end of the arms, a pressure plate provided with depending arms swung upon the aforesaid rod intermediate of their length, a leaf spring secured to one arm and bearing at its free end against an arm of the rock shaft, and means coacting with the arms of the pressure plate for swinging the inner edge of the pressure plate upward when the plate is swung outward and downward when the plate is swung inward.

14. In a zigzag pile forming machine, the combination with a pile support and means for zigzagging a web strip to form a pile 0n the support, of a pressure device at each side of the support each comprising a rockable shaft journalled in suitable bearings, a pair of radial arms carried by the rocking shaft, means for rocking the shaft to carry the arms outward and inward as each fold is made, a rod held in the outer end of the arms, a pressure plate provided with depending arms swung upon the aforesaid rod intermediate of their length, a leaf spring secured Vto one arm and bearing at its free end against an arm of the rock shaft, and a bracket carried on a suitable support and provided with latstandard plates at each side of the feeding rollers, hangers carried by the supporting rods, a rock shaft journalled in the hangers, stripper fingers carried by each rocking shaft, and cam means operated by the feed roller shafts for rocking the rock shafts.

16. In a zigzag pile forming machine, a pair of web feeding rollers through which the web is adapted to pass, means for creasing the web alternately on opposite sides as it passes therethrough, a rock shaft located at each side of the feed rollers and the pile, stripper fingers carried by the rockshafts to alternately en age the adjacent feed roll and pile top, a per orated air tube extending parallel to the rock shafts, an air supply pipe for feeding air to each tube, a valve controlling the flow of air through the supply pipe, and means for automatically opening the valves as the stripper lingers are raised into contact with the feed rolls.

IVALTER HAROLD SMITH.

eral projections located in the path of swing v of the lower ends of the arms of the pressure plate to tilt the pressure plate upward or downward as it is carried into proximity with such projections.

, 15. In a zigzag pile forming machine, the combination with a pair of opposing standard plates, a pair of shafts journalled in the standard plates, a web feeding roller secured to each shaft, means for resiliently pressing the rollers together to grip the web passing therebetween, a supporting rod carried by the

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