US1460059A - Sheet-stacking mechanism - Google Patents

Description

June 26, 1923. M. FINE SHEET STACKINGMECHANISM 4 sheets-sheet I INVENT .Il l. III-ll I MW M ATTORNEYS B. M. FI NE SHEET. STACKING MECHANISM June 26, 1923.

Filed oct v. 1921* 4 Sheet s-Shet 2 ATTORNEYS- Ill-l llll lll B. M. FINE SHEET STACKINGMECHANISM June 26, 1923.

4 Sheets-Sheet'S Filed Oct.

INVENTOR IIIIIIIIII'IIYI $5 Q n wuug III J1me 26. 1923.

B. M. FINE SHEET STACKING MECHANISM Filed Oct. 17 {1921 4 Sheets-Sheet 4 filwl INVENTOR i minnwzvs BY- 0 aim/M Patented June 26, 1923.

BEF'NARD terms, or nnrrronn TOWNSHIP, GLOUCESTER coU'N'rY, New JERSEY, ASSIGNQR'TO' SAMUEL M. LANGSTQN COMPANY, or CAMDEN, NEW JERSEY, a con-q PORATION OF NEW JERSEY.

sHEE'r-sriioKING MECHANISM.

' Application filed October 17, 1921. .SeriaI No. 508,082.

T all 14:71pm, it may @mm.-' T

Be it known that I, BERNARD M. FINE, a citizen'of the United States, and resident .of Deptford Township, inthe county of- Gloucester and State of New Jersey, have invented certainnew and useful Improve- -ments in "Sheet-Stacking Mechanism, 7 of which the following is a specification.

This invention relates 'to machines for the stacking or piling of material, and more particularly to sheet material or sections cut from a continuously advancing sheet. My

" improved machine is designed to cute con tinuously' advancing sheet into sections, ad-

. Vance the sections at-a1 faster rate than that of. the travel of the body of the sheet so as to space the sections apart, and to deliver the 3 1 sections in predetermined numbers first to one stacking mechanism and then to another,

so that while one stack is being built up another may be rem'oved,and'.the parts restored to proper position for beginning a new stack.

One of the main objects of my invention is to'so design, arrange and construct the parts that every high speed operation is possihle aIid-accurate stacking is secured with all of the'stacks containing the same number-- -of sheets or sections. I do not wish to be limited,to the use of any particular kind of sheet material, although certain features of the construction'hereinafter described have been designed for handling sheet material of the samegeneral properties as that employed in the manufacture ofcom'position shingles.-

7 Among theiimportant features and objects of my invention are the complete and accurate severing of the sheet into sections without interfering with the uniform and continuous advancement of the-sheet, the supporting and conveying of the sectionsfrom the cut off mechanism to the feed rolls, the advancing of each, section at a faster speed than that of the body immediatelyupon its severance, the guiding or directing of the sections'to separate-conveyors, the reversing of thepositioh of the guidingmeans after-a predetermined number of sheets have been delivered toaconveyoigthe automatic control' of the position-of the conveymg'means in respect'to the top of the stack, and the maintenance of proper'operative condition of the conveyor in its different adjusted post tions. These and various other features will be pointed out more particularly in connecbroken away,

tion with the following detailed description of one of many forms which my invention may assume. I do not wish to be limited to the-specific form illustrated, except in so far as itis defined in the appended claims.

Theclaims involving the cutter mechanism have been transferred to a divisional application Serial In the accompanying drawings 1- Fig. 1 is a vertical longitudinal section of a portion of a machine-embodying my inven-' tion,

of the machine shown in Fig.1, parts being Fig.2 is a top plan view of the portion's No. 569,396, filed June 19th, 3

Fig. 3 is a sectioni similar to Fig; 1, but

showing the parts at the left of those shown in Fig. l,

Fig. 4' is a transverse section looking in the direction of the arrow A: of Fig. 3,

Fig. 5 is a transverse section looking in the direction of thearrow 5 of Fig. 1,

Fig. 6 is a side elevation of the portion of the machine at the right hand side of Fig.1,

is a sectional detail on the line 7-7 and in many respects independent of any particular mechanism forcutting the sheet transversely into sections.

So far as certain features of the invention are concerned, it is preferable, if: not essen tial, that the cut oil mechanism be of such a type that. it does not interfere with the continuous and uniform delivery of sheet material. This is preferably accomplished by employing a cut oif mechanism which will more back and forth in the general direction of travel of thesheen'and will out;

while traveling with the sheet and at ap n'oximately'the same speed. A preferred cut off mechanism is that illustrated and claimed in the Langston Patent 1,359,076,

. ,i. ens. r

"farms u a m d to swing about" a Stat10n 10;

such. a out, off. mechanism and tobe had to said. patent for a rec mp tedisclos'ureof the construcration; -The cut off mechanism terfj ltr'mounted on a translf wliich latter, is arried by ary. axis 135A second cutter l i 'is carried by another transverse beam 15, which latter is cagrried'byarms 1.6 pivoted to the arms-12f The cutjoif mechanism is operated by .a crank connected to the ends of the arms flfi' -s'o as to give-the cutter 10 a back and forth movement in the general directionbfptravel of: the material, and an ape proximately elliptical movement of the cutter 14 andi-ntersecting the path of movement of-the cutter during the movement of the latter with the material.

Any suitablemeans may be employed for continuously and uniformly advancing the sheet between said cutters in the'direction of the arrow. Merely for purposes of illustration I have shown, in Fig. 9, a pair of driven feed rolls 17 18 for this purpose.

The advancing end of the sheet enters between a pairof superposed feed rolls 19-20 spaced just beyond the limiting position of the cut off mechanism. .The lower'feed roll 20 is made up ofa series of axially spaced material gripping or engaging portions 21 (see Fig. 2) andbetween these portions 21 there are intermediate portions 22 of reduced diameter and preferably in the form of idler rolls free to rotate in either direction in respect to the sheet-engaging pertions 21. These idler'rolls maybe in the form of sleeves or collars mounted onroller bearings. 4

cutter and the feed rolls 19-920, for guiding the sheet -to these rolls, preventingthe end from dropping down between thecutter and rolls and for acting as conveyors, I provide a plurality of flexible strips or belts 23. Thesesmay each havebne end-secured to the cutter 10 or the supporting beam of 22 and may extend between the feed rolls 1920'without engagingwiththe upperfeed I provide means for keeping these belts,

' sion.

the latter, and each may be of a width sub stantially equal' to the width of the idlers roll 19. As the two feed rolls rotate about stationary axes and the cutter is movable back and forth in respect to these feed rolls,

conveyors or supports taut, orunder ten- Such means mayinc-lude' a series of springs 24 each secured to the end of its corresponding belt section, and to anadjusting and securing connection 25. on the base or other stationary part of. the machine.

Thus, as the cutter 10 moves back and forth the portions of the belts 23 between the cutter and the feed rolls will remainftaut and" the belts willlmove back-'and-fortli between the [feed rolls b y the rotation (if-1t eidlers other. This movement. will not interfere 22, first intone direction -"and fthexifin thfi 7 o with the proper gripping and advancing of iv 1 the material between thefeedroll 19 and the portions 21 of the lower feed roll. Fur

thermore, the cut off mechanism"and the' feed, rollsrare so positioned in respect to each otheranct thecut mechanism v oper ates tomake sections of suehilength'jthat the advancing end of the .sheetgenters between the feed 'roll' l 9 20 beforethe'jcuttingaction takes place, andi.therefore theflreturn movement of the cutter and belts doesflnot intertote with the e0ntinuoi1s advancement of the cut off sections after they have. entered between the fed'r'olls 19-20, v f line length i'se slittingef the sheet has 'takenplace and the cut i 'oiffsection thereffore'of a-singlej piece ot-"full width ofjthe sheet, the number, width and spacing-of the belts 23 is comparativelyunimportant. In "that case it is; only' essential thattherebe enough of these be1t s,.;and that theybe of such widthjas will" properly support the sheet betweenjthe cutter and tlie fe'edrolls.

If the sheetQbe slitted lengthwise'into strips before the cutoff action takes place, the cut off section will include a plurality of separate places A, and in that event-the belts 23 should be properly spaced in respect to theseseparate pieces. In the manufacture of composition shingles it is customary; to cut notches a at the corners of the shingles,

as indicated in Fig. 2, and these notches may be cut even, -though the sheet is not slitted lengthwise to make individual shingl'es. If any such portion of the sheet is i cut therefrom either in the making of shinor supporting the materialbetween the "thatthe belts 23 be .so positioned that the small pieces may fall from the cut off section gles or any other articles, it is preferable and between adjacent belts 23. As shown, the belts 23 are sopositioned as to .corre-I spond in number ;to the shingles A, and

each belt comes intermediate the side edges of auc'orresponding shingle soth-at {the notchesa come between adj acentbelts.

Beyondthe feed rolls 19-20 are another pair of superposed feed rolls 27. 28 which" receive the out. as sections from the. feed rolls 19- 20. clghe sections may be guided across'from one pair of feed rolls toth'e other on a supporting platform '29, or in any other suitable manner, but'the two pairs of rolls are preferably so spaced in respect to each other than the sheet sections e'nter between the rolls 27 and 28 beforet'hey leave the rolls 19-20. In order. tofacilitate the with another, I prooperation of the stacking. mechanism and prevent the possibility of one section over-c .lapping or interferin .vide means. whereby the space between'sucoessiveisections at the transverse cut is' g opened up by agseparating of the cut off sections; This isaccomplished byoperating the; feed rolls 27-28 at a higher speed, of

surface travel than that of the rate of travel of the body of the sheet, determined 'for instance, by the speed of surface travel of the grinding action of them on thematerial and to' prevent them from retarding the movement of the cut off sections.- The driving mechanism is shown as including a drive chain operated from thesame source of power as that which advances the body of the sheet. This chain engages a sprocket 31 on the shaft 32 of the feed roll 28.: This shaft has a" gear meshing with the gear 33 ofthe upper feed roll 27' so as to drive the. two rolls at the same surface speed. The

I shaft'32 also has a gear 34 meshing with an intermediate gear 35 transmitting power to a gear 36 on the-shaft 37 of the lower feed to the shaft 37 but is connected thereto by a suitable slip friction clutch. One form which this clutch may assume is illustrated .in 7. The gear 36 has an annular flange the gear 36 .to press the disks together to give 38 inclosing a multiple disk clutch, each alternate disk being held against rotation in respect to the flange and the remaining disks being held against rotation in respect to the shaft. A collar 39 is slidable on the shaft and carriers push rods 40 projecting through the desired frictional resistance and capa-. bility of slipping. The pressure may be accurately adjusted for instance by means of a yoke arm 41 pivoted to a bracket 42 on the frame of the machine and engaging trunnions on the collar 39. A rod 43 engages this arm and carries a hand wheel 44 and spring 45 so that by rotation of the hand wheel any desired resilient pressure may be appliedto when the resistance exceeds the predetermined amount. The shaft 27 has agear 46 meshing with a gear 47 on the shaft of the upper roll 19. The gear transmission ratio is such that when there is no slipping in the clutch the feedrolls 19-20 will travel With the same surface speed as the feed rolls 2728. this speed-being materially higher than that at which the sheet of uncut material is advanced. The friction of the clutch is so adjusted that as soon as the ad vancing end of the sheetenters between the rolls 1920. the slipping takes place in the the main body of the sheet offers to an inand then slippingof the clutch may terminate and the rolls 19 20wi-ll immediately crease inspeed. I The instai t that tliecut oil action takes place this resistance terminates,

increase their speed to that" offthe rolls 27 -28. 'Thus, when the out off sectionenters between the rolls 27-1-28 it will he traveling at thejsurfacesp'eed of-the latter and theref-will be no slipping of the sheet ma' terial between these rolls... The rolls 19.-20

rotate-at'one'speedwhile' engaging with the sheet before the end 'is cut off, and,rotate at 'a higher speed as soon as the section is cut ofi. Thus-the instant that the cut off action takes place, the cut-foil section jumps forward to widen the gap'between it and the advancing end for v.thefnex't successive sec-i tion." The upper feed'rolls 1 9 and 27 are preferably mounted for such vertical movevariations in thickness of the sheet. shown, the shaft of the upper roll 19- is mounted in'a pair of pivoted arms 48, and

the shaft of the roll 27 is mounted in a pair of pivoted arms 49. roll 20. The gear 36 is not directly keyed My improved machine particularly designed for high speed operation'and buildingup stacks each containing a predetermined number of sheets. To accomplish .ment as is necessary to take. care of the this object I provide two separate stack supports and deliver apredetermined number of sheets to one stack and then the-same number to the other stack, thus providing time for the operator to remove one and to starting position while the other stack.

1 is being piled up. w The delivery mechanism includes two conveyors 5.051, each preferably in the fornrofIa set of endless belts.

Means are provided for guiding the sheets to one conveyor for a predetermined interval and then to the other conveyor for a similar interval. The feed roll 28 pref-I erably serves asone of thesupporting rollers for the conveyor belts 51; and a second pair of feed rolls 5253 are provided, the lower one 52, serving as oneof the supporting rollers for the conveyor belts 50.

The feed rolls '5253 are disposed beyond the rolls 27-28 in the general direction. of travel of the material; and preferably at' a slightly higher elevation. The conveyor 'belts 50 are arranged above the conveyor belts 51, and preferably the two diverge,

the former slightly inclined upwardly,'and

trated as a plate 54 secured to a pivot 55.

just in advance of the line of tangency of permit the delivery mechanism to return theiteedi iillsifii a3; iind' ;.'5 6 i'proje'cti g through betweenthef-rolls 27 ""28 ower roll 26 hasaseriespf spaced 4 reduced diameter, for receiving 271 fingjeig se-jiisro ct {rim the passages between the rolls formed 'by these 1 duced-diameteri-vportions"'57-.and 58, and vsuch lengthfthat r sdpositiondjand jofr renting fingers:

half of. it and between adjacent-flicks there "'ons'57fl'of reduced diam; g with corresponding. .p'or- 1 the upper v were'd {and-:- epme either bove; o'r jbelpw the ine'of tan-gency ofi t h'e material;engagingpoflions-z-df the; two {rolls 27- 28;v When 'tli'e "guide plate 54 n s g ':rsa -f t oiwer po i ns I as. indicatedfin FigfLfall {of .the out 01i.

. pivotalsupport forthe latter.

" mepe v'ersing 'thefposition the 7 guide eachhalf revolutionot the shaftg' Asshown, v the shafticarries a*cam;disk havingone 7-2 normally tends "to lift the rod .71---' an *sections erfsheet's' asjjthey pass.,between"the g "surface of the plate {to the-feed rolls and will lloe; carried away, by thei conveyon.

' limiting positiongin other words; its raised position, asi'shown FigI S, the endE of the fingers comes'abdve the line of -'tangenc v' and-all Qmh eut e sections or sheets will I pass beneath the-Yjguide plate 5.4f andwilt be carried iaf'wa'y the lower conveyor 51};

The'feedfrolls are. driven with substantially the same surface speed as the rolls- 27 28, and byany suitable driving iiicha nism. Asshown, the shaft 32; of the-lower;

feed roll 28 has" a sprocket transmitting power through a 1 chain '60 "to-"a? sprocket on the shaft-of: the lower roll 52 The upper roll 53 .'has its shaft mounted in pivoted arms 61 to permit-of variation in the thickness of the f materialpassing --bet-we en, the rolls and the. tworolls? haveiintermeshin'ggears,

24 3; r-"driving the upper P011163 So faras the operation is concerned,-v the upper conveyor might b *a. single. belt of the. d875 siredj w idth, but 'thi'sqis not .necessary, ,and- 7 preferably. a plurality of narrow belts are. 1 employed; cachfengaging a corresponding 4 reducedldiameterportion of theroll52. To

' Initf 'the' proper operation of the fingers 5Q he lowerconvevm 5lis made up of the :se'pa t-space'dl'belts. "I As-"previously no ted, the,b'elts 23' are so lposjitione'd thatl'they come intermediate of theedgeslof the separateypieces of the" cut 7 V 'ection, so vthat outputs-portions may "fall-vbetween; Preferably thebelts. 50-51 off. as

..a1e arranged alternately t ogthe'. belts 23.

ther-w'ords. they are so spaced that each p led @301. "shingle-A is supported'alongits 'twofopposite edges. asxillustrated in Fig. 2.

Thisprevents-the side edges from curling down *duringthe, comparatively longer run {5 alongthese conveyors. For controllingnd ,r' of the guide 'plate 54 I provide acontroltimin g the operation shaft .64.;with controlling mechanism for rey been built up to the desired height. Ach "jacent to the support 74 thereis a carriage 76 mounted for vertical movement, and hav-.

ingsa pair of rollers 7778, the lower of .which carries the corresponding, conveyor belt 51. The carriage 76 is vertically mov- 54' to' ts 'upperipos itionr as shown 3 in" Fig. 8,

andthe 'cut off sections or sheets may pass beneath-the late. --;Thu s,ftheguide plate is T positively he d in a lowered positiom and the e mer tes. t a p'a i fifrom theother'fhal ii by shoulder or inc1i 1d' portionsfit .I The'motioni-maybeltransihittedq- I; 7 1 t -mm I e gei ep1e e em var 1 ous different-ways, that'illustrated incl' i'ding a,v pivoted lever: 67 mounted to en age "the working face of the cam, and connected by a flink 68,to' abell crank lever 69.; The. I latter-is'jcohhecteid-;byja rod 'ZOto an arm-71 5 "connected-t0. the-guide plate 5'4 or ito' e 1 coil sprin I Q thuls hold the operating end of the lever 67* againstlthe cam; The c am,,d)1ring a half; reyolution;holds'therod' down and kee s the 'ide 54 in'it'sglowermost position. Vhen to y spring acts only to hold'it in raised position Wllflll'lil is not supporting sheets passing over it.- v v There are two'separate stacking Ine'chanisms for the two conveyors 50and 51$ For the weight of any the .p'resentxl will consider only 'thestackirig mechanism for the conveyor 5'1. This includes a support-upon which theshee'ts may be stacked and means for'varying the relative elevation ofthe support and the con-' veyor as the stack increases in height. This I} variation in elevation-might be accomplished by a gradual lowering of the stack support,

forby a gradual risingof the outer end of the conveyor. As' shown, the stack support is in the form of a platform '74 vhich may be laterally movable intoand out of operaltive position On a transverse guide of some character. That illustrated includes aseries of rollers along which the platform 74 move with its load when the stack has able on aframe part 79 and tilting-or irregular movement may be prevented by providing the frame part with apair of station'- ary rack. bars 80 meshing with pinions 81 I keyed to a transverse shaft 82 mounted ;on

the carriage. The same shaftbi which op- .eratesito control the guide 54: also acts for the raising and lowering of the carriage. As shown, the shaft is provlded with a cam 83 engaging with an anti-friction roller 84 on the carriage. The cam is-of such form' that during a half revolution of the shaft 64; the carriage is raised at a slow and uniform rate and is lowered during the remaining half revolution of the shaft.

The difference inmaximum and minimum radii .of the cam is equal to the height of .th'e'stack, which it is desired to build up on the platform 74, and the curvature of the ca-ni and speed of rotation of the shaft 61 I sion.

-ically operating belt tighteners which are preferably in the form of rollers 85, each is such in respect to the thickness of the material-operated uponthat the carriage will rise a'distance' equal to the thickness of each operation of the 'cut off more .nearly horizontal and therefore would tend to loosen the belts or reduce their ten- To prevent this I provide automatmounted' to engage with its corresponding belt 51, and each carried by a lever 86 piv ted on the "carriage. Each lever is pivoted Y intermediate of its ends and the end oppositeto the roller' 85 is connected to some stationary part of the machine by a spring 87. As the carriage rises the fulcrum of the lever'rises and the spring acts with gradually increasing force to hold the rollers 85 against their corresponding belts-and keep the belts properly taut at all times.

The sheets, as delivered by the conveyor 51 between thexrolls 77' and 78 are ordinarily traveling at fairly high speed and even after leaving-the rolls tend to continue in the same general direction. For in uring the'building up of an even and regular stack, a stop 90 forming a back wall against which the sheets may abut, is provided. This may be carried by a pair of supporting rods 91, and

be adjusted toward and from the end of the conveyor in accordance with the length of the sheets being pile-d. The carriage also preferably carries friction means tending to slow down the speed of the sheets as they pass on to the stack, and prevent any return movement after reaching the stop 90. This is shown as a pair of transversely extending 'brushes9293 carried by a frame 94 pivoted on the carriage and movable upwardly with the latter. The brushes are inclined in the direction of travel of the shafts so that they effectively prevent the sheets from bounding back from the stop 90. r

The stacking mechanism for the conveyor 50 may be substantially identical with that for the conveyor 51 except that the conveyor 50 extends over or above the stacking mechanism of the conveyor 51 and therefore the frame part 7 9 of one stack mechanism is made low, and the frame part 79 of the other stack mechanism (see Figs. 3 and 4) is made comparatively high. The shaft 64: has a second cam 83 similar to the cam 83 but with its high part diametrically opposite to that of the cam 83 so that it acts to lower the carriage 76 While the cam 83 is raising the carriage 76. As the two cams 83 and 83 are mounted on the same shaft, the carriage 76 may differ somewhat in design from the carriage 76 so as to space the rollers 7 7, 78 to a greater distance above the roller 84*. The frame part 79 may serve as the supportfor the stop 90 and mayalso carry rods 91 for supporting the stop 90. Otherwise the construction of the stacking mechanism of the conyeyor 50 may be substan tially the same as that for the conveyor 51. The shaft 64 may be rotated at the proper speed, dependent upon the thickness of the sheet material and the maximum difference in elevation produced by the cams 83 and 83 The driving mechanism for the shaft should be connected to or properly timed in respect to the operating. mechanism for the J sheet feeding and cut off mechanism.

As shown, the shaft 64; has a worm wheel 96 -meshi-ng with a worm 97 driven by a chain 98 and sprocket 99. The driving mechanism for the chainmay extend to the same driving mechanism that operates the chain Having thus described my invention, what I claim as new and desire to secure by Letters Patent is '1. A machine of the class described, in-

cluding two spaced pairs of superposed feed rolls, the lower roll of each pair having por- 30, and the out off mechanism. The-speed tions of reduced diameter, separate sets of conveyor belts engaging with the reduced diameter portions of said Iowe'rrolls, and

means for guiding material from one set of rolls to the other, independently of the conveyor belts of .the first mentioned rolls.

2. A machine .of the class described, ineluding two spaced pairs of superposed feed rolls, the lower roll of each pair having portions of reduceddiameter,-separate sets of conveyor belts engaging with the reduced diameter portions of said lowerrolls, and a guide for preventing-or permitting the ma terial passing from one of said pairs of rolls to the other.

3. A machine of the class described, including a support upon which sheet material may be stacked, a conveyor for delivering sheets to said support guide means for controlling the delivery of sheets to said conveyor, and a pair of cams operatively connected, one cam acting to effect-a gradual variation in the relative elevations ofsaid support and conveyor, and the other cam operating said guide to permit the delivery of sheets to said conveyor only during the relative movement of said support and conveyor in one direction.

4. A machine of; the class described, in-

eluding a support upon which sheet material'may be stacked, a rolleradjacent to said support, a conveyor belt. extending around said roller, said roller and support being relatively movable vertically, and a rotatable cam operating during a portion of a revolution togradually raise one of them to a height dependent upon the height of the stack to be piled on said support, and

during. the remainder of the revolution to lower it to starting position.

- 5. A machine of the class described, hav ing a pair of rollsone arranged above and in advance ofthe other, separate conveyor belts extending over saidrrolls, means for directing subdivided material to one of said rolls, guiding means, and means for operating the latter to direct aplurality of sheets of material from said first mentioned roll to the second rolland to the conveyor belt of the first mentioned roll, alternately.

,6. A machine of the class described, in-- cluding a pair of superposed IO.lls,-e'ach having portions of reduced diameter, a series of spaced conveyor belts engaging with the lowerroll and guiding means having portions projecting between said rolls at saidv portions of reduced diameter and movable to prevent or permit-the conveying of material from said rolls on said belts.

' 7. A machine of the class described, including a pair of superposed rolls, each having portions of reduced diameter, a series of spaced conveyor belts engaging with the lower roll, and a pivoted guiding member projecting between said rolls and movable to either side of the line of tangency of said rolls to prevent or permit the conveying of material from said rolls by said belts.

8. A machine of the-class described, including two pairs of feed rolls arranged in succession, a conveyor belt extending around the lower roll of one pair and beneath the.

secondpair, a second conveyor belt extending aroundthe lower roll of the second pair and a guide plate pivoted adjacent to the line of tangenc-y of the second mentioned rolls and terminating adjacent to the line of tangency of the first mentioned rolls and having the last mentioned end adjustable to positions above or below the material passing between the first mentioned rolls.

9. A machine of the class described, includingtwo pairs of feed rolls arranged in succession, a-conveyor belt extending around the lower roll of one-pair and beneath the second pair, a second conveyor belt extending around the lower roll of the second pair,

i i a guideplate pivoted adjacent to the line oftangencyof the second mentioned'rolls and terminating adjacent to the line of tangency of the first mentioned rolls and having the lastmentioned end adjustable to positions )'above or below the materialpassing between. :thefirst mentioned rolls, and means operating automatically to move said guide plate predetermined intervals.

T 10. A machine of the class described, in

cluding two pairs'of feed rolls arranged in back andI 'forth between said positions at succession, a conveyor belt extending around 'the lower rolLof one pair and beneath the second pair; a secon conveyor belt .extend- 4 ing around the lower roll of the second pair and a guide plate pivoted adjacent to the line of tangency of the second mentioned rolls and terminating adjacent to the line of;

tangency of the first mentioned rolls and having th last mentioned end adjustable to positions above orbelow the material passing-between the first mentioned rolls, and

means for shifting said plate at predeter-.

mined intervalsfrom. one position to the veyor belts alternately. Y V 11. A machine of the class described, including a pair of supports upon which sheet mate: i ll may be stacked, separate conveyors extending 'to p nts adjacent to said sup- .other to permit the delivery of predetermined quantities of material over said conports, means for raising and lowering'the raised during the lowering movement of the other, and" means for deliveringsheet material to each conveyor during the raising movement of the latter.

delivery ends of said conveyors, one being 12) A machine of the class described, in

movement and preventing said deliver'y dur-- ing the lowering movement.

14. A machine of the class rolls, one rotatable about a fixed axis, means for raising and lowering the other roll, a guide for permitting or preventing the delivery of sheet material to said conveyor belt, and means for-shifting the position of said guide each time the direction of movement of said second mentioned roll is reversed.

15. Amachine of the class described, in-

eluding a support upon which sheet material.

may be stacked, a vertically movable carriage adjacent thereto, a conveyor belt, a pair of supportlng, rolls therefor, one rotatable about a fixed. axisand the other mounted on said carriage, guiding means fogpermitting or preventing the delivery of said described, ineluding an'endless' belt,'a pair of supporting l l i mounted on said carriage, guiding means for permitting or preventing the delivery of sheets to said conveyor belt, and a control shaft hav ng-means for raising said carriage .during a half revolution of the shaft and lowering it during the other half, and means for shifting the position of said guiding means .twice during each revolution of the shaft atftime intervals corresponding to'the reversal of the direction of movement of the carriage.

' ,rial may be stacked, a vertically movable carriage adjacent thereto, a roller, carried sition.

1 7. A'machine of the class described, including a support upon which sheet matethereby, a conveyor belt extending around .said roller, and a rotatable cam operating 30 during a portion'of a revolution to gradu: ally raisesaid carriage to a height dependent upon the height of the stack to be piled on said 'supportand during the remainder of the revolutionto lower it to starting po- 18. A machine of the-class described,in-

eluding a-pair of'supports upon which sheet material maybe stacked, a pair of vertically movable carriages, one mounted adjacent to each'support, delivery meansffor the sheets, a. pair of conveyors, one extending from said delivery means to one carriage and the other to the other carriage. and means for guiding the sheets from said delivery means to either conveyor, a shaft, and a pair of.

cams thereon for raising and lowering said carriages, the cams being so positloned as to raise one during the lowering movement of the other.

19. A machine of the class described, including a pair of supports upon which sheet material may be stacked, a pair of vertically movable carriages, one adjacent 'toeach support, conveyors extending to said carriages,

a control shaft. a pair of cams on said shaft for raising and lowering said carriages, one acting to IBJSQ onecarriage while the other is lowering the other carriage, and a third cam on said shaft and acting to control the delivery of sheets to, said conveyors only during the upward movement of .the corresponding carriages 20. A machine of the class described, including a support upon which sheets may be stacked, a vertically movable carriage adjacent thereto, a pair of stationary rack bars adjacent to opposite ends of said carriage a shaft carried by said carriage and-having -pinions meshing with said rack bars, a pair of rollers carried .by said carriage and between which the sheets are delivered, and

a conveyor belt extending around the lower a of said rollers.

' 21. A machine of the class described, in- I eluding a support upon which sheets may be stacked, a vertically "movablecarriage adja- 'cent thereto, a pair of stationary rack bars adjacent to opposite ends of 'said carriage, a shaft carried by said carriage and having pinions meshing with said rack bars, a roller carried by said carriage-and a conveyor belt extending around said roller and acting to deliver sheets to the 'top of the:

stack. 22. A machine of the class described, including a support upon which sheets maybe stacked, a vertically 1 movable carriage, a'

roller carried thereby, a second roller rota table about a fixed a'xis,-a conveyor belt supported by said rollers, and means secured to the carriage for automatically maintaining the tension of the belt during the vertical movement of the carriage.

23. A machine of the classdescr1bed,*including a support upon-which sheets may be stacked, a vertically movable carriage, a

roller carried thereby, a secondroller rotatable about a fixed axis, a conveyor-belt supported by said rollers, a lever pivoted to said carriage, a belt-tightening rollercarried by said lever, and means for swinging" the lever to maintain the" tension of the-belt during the vertical movement of the earriage.

- 24. A machine of the class described, in-

eluding a support upon which sheets may be stacked, a' vertically-movable carriage, a roller carr ed thereby, asecond roller rota table'about a fixed axis, a conveyor belt sup-.

ported by said rollers, and means for automatically maintaining the tension of thebelt during the vertical movement of the carriage, including a lever pivoted inter-- mediate of its ends on said-carriage, tension means connected to one end of-said lever, and a belt tightening roller carried by the opposite end of said lever.

25. A machine of the class described, in-

eluding a pair of supports upon which sheet material may be stacked, and disposed at. different elevations, a pair of vertically movable carriages, one adjacent to each support, a pair of superposed conveyor belts,

one extending to one carriage and the other extending above said carriage and its corresponding support to the other carriage, means for raising and lowering said carriages alternatelyandmeans for delivering cessive'sheets are delivered,

sheet material to said conveyor belts alternatelyQ; v

126. A machine of the class described, in; cli 1ding a pair of supports upon which sheet i5. material 'may, be stacked, and disposed at different elevations, a 'dpair v of ;verticallly "movable carriages, one a jacent toe ach sup- "porg'apair ofsuperposed conveyor belts; onefextending to one carriage andthe other fextendingabove said carriage and its corresponding support to the other carriage, means forjraisingand lowering said car'- 27.15 machine of the class described? ineluding a support upon which sheet material 'may' be stacked, a' vertically movable carriage. adjacent thereto, .a conveyorbelt extending to said carriagexforg the delivery of: SIlCCGSSlXG sheets, a stop 7 for preventing,

' movement of th sheets-acrosssa1dsupport .past -a' predetermined point, andineans for the top of the stack and beneath which suciiaiges' alternately andmeansfor delivering *"sheetymaterial to said conveyorbelts alter-' i5 na tely, andonly during the upward move Inent of the corresponding carriage.

preventing return movement of the sheets,- i said means '-including vav brush pivotally' mounted upon thecarriageand resting upon lower said carriage,'and the other operating to move said guide.

29. A machine of theclass described, including a support upon which sheets may'be stacked, a vertically movable carriage adjacent thereto, a roller supported bysaid carriage, a conveyor extending around said] .roller, :1 pivoted guide for permitting or preventing the delivery of sheets to said conveyor, a controlshaft having a pair of cams thereon, one operating to raise and lower said carriage, and the other operatlng to move said.guide, a guide forcontrolling the delivery of sheetsto-said conveyor, and. Y

a cam operating"in'j synchronisin with the 'first mentioned cam for operating said guide.

30 eluding a-pair of rollers, a conveyor belt A machine of class described, in-' supported thereby, means for deliverin sheets to saidbelt adjacent to one of sai rollers, said roller and said delivery means I being relatively movable to permit-or pre-" vent said delivery, sheet receiving means 'a'd-" jacent to the other roller, said last men-' tioned roller and said 'last mentioned means,

being relatively movable vertically, and control 'means for preventing delivery of sheets.

to said conveyor during. relative movement of said receiving means and said last m.entfoned roller in one direction, and permitting delivery during relative movement in the opposite direction.

den'and State of New J ersey this 13th day ofOctober A. 11.1921. i 4 f BERNARI? VF NE.

l Signed at Camden inthecounty of Cain-

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