US2202540A - Corn husking machine - Google Patents

Description

w. w. P. s'rEL-rER 2,202,540 CORN HUSKING MACHINE May 2s, 1940.'

Filed DeC. 18, 1956 3 Sheets-Sheet 1 May 2s, 1940. w. w. P. STEUER CORN HUSKING MACHINE v Filed Dec. 18, 193e s sheets-sheet 2 I/v VEN rw?, WHL rfi W. Efira TE/,

May 28, 1940. v l w. w. RSTEI- TER 2,202,540

` CORN HSKINQMAGHINE I `Filed Dec. 1 8, 195e ashets-sheet s j; 7155.5 I 7 y /i Ar/v VEN raf?.

5J x WHAT-m WP. rari/f.

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www Nazi/2mm K f inasmuch as the present invention'has todo with gto-these sides arelupwardly pro-jectingside ex-4 Patented yMay 28,l 1940 UNITED Ils'lziljflesv OFFICE;

PATENT;

oonN HUSKING MACHINE fwalterw. r. steitencho, Minn. Application December A18, 1936,- Serial No. 116,593

io claims@ (o1. ,13o-5) y This invention i relates to corn husking and shredding machines,

It is one of the objects of the invention 'to provide VVnovel and improved v e feeding means for such machines.

e A "further object is to provide novel and improved husking means for such machines.

'It is more specifically an object of the inven-k tion to provide improvements on my previous in# `ventions disclosediri my U. S.'Patent No. 2,016,910 issued October 8, 1935, entitled Feeder for corn shreddershand the like"l and in .my U. S. patent entitled Feeders for` cornI Shredders and' the like No 2,085,174,1ssued June 29, 1937.'. Y v

The objects andradvantages of the invention Will'gmore fully appear. from-the following de-y scription made in connection with the"v accom panying drawings;` wherein like reference char-kI acters refer to the same or similar partsthrougli-` out the lvarious views',l and iriwhich, g v

Fig. 1 is aview the major portionsfof arcorn'hu'sker and 4shredder embodying the invention;

2 is` a longitudinal thefmachine shown in Fig. 1 on approxir'natelyr the line 2---2` of Fig. 3, as indicated by the arrows; Fig. 3 is a section taken lon the line 3-3 of Fig. 2 as indicated'by the arrows; V

` Fig. 4 is a plan view looking down on portions f ofl the husking rollers ofthe machine;

5-is a viewin enlarged scale of one of the band snappers ofthe machine.

' Fig. 6 is a Vertif al section on an enlargedscale illustrating the snapping rollers and one ofl the bridging bars carried by one of the. decks ofthe machine, and n* f Y Fig. 7 is a section taken on the line V.'I--l yof Fig. 6, as indicated by thearrows. v

rReferring to thedrawings, the major parts' of a combination corn huskingand shredding machine are illustrated. The 'front end of this* dto bev the left end of the machine is considere machine, as viewed in Fig. 1 of the drawings.

the mechanis snapp'ng `rollers of .such a machine as is illustrated and it also tifyV by number a few of the morekor less .standardized partsof the general machine.

The left side of the machine appearing at the left sideof Fig. 3 ofthe drawings is'designated by the numeral 6, while the right side of the niachine'l is designated by the numeral 1. Attached lI3 which carries the/cutters e `snapping roller I'I is springl pressed ,towards the lower snapping` roller in lin side elevation illustrating i section taken through,

6 and 1 of themachine. located at the same level vin parallel relation into 'achute 2,0 vwhich feeds to delivery of the corn asinto a wagon or the like.

therebetween. In

.l for feedingthe material into thev has to do with the huskingY mechanism, it will merelybe necessary to identhe machine to extend adjacent the rforward carries 'beveled pinions 23 ofeachpair of husking rollers I'I.

24 also `carries at itsy 55rte'nsions or wings 8 and' 9 respectively, which are `not found in the usualma'china and these wings project forwardly `from'the rear end of the mal chine and they are l'cross connectedat their for- 1 ward portions byja curved plate I0 which overlies `5 andcloses off thespace ,abovev the Vsnapping rollers I I, the cutterbar I2 and the cutter head I4. AThe upper the `snapping rollers I Iv and the ycutter I3 extend between and arev journaled 'in the forward portions of the extensions 8 and 9 in the usual relation., `Of coursethe cutter bar l2 also extends between the extensions 'and 9. VSlightly rearwardly from the curved'plate Ill'the extensions 8 f and 9 'arefadditionallygcross 'connected yby! a curved plate `I5.of arcuate shape in cross section andhaving` va forwardly projecting extension at its lower edge. A deck and 4rearwardly from adjacent the rear side of the flower snapping '-roller` II to deliver thek earsof'corn snapped off Vthe stalks by the snapping rollers II to the receiving ends of a plurality of husking rollers Il; located considerably below the level of the snapping rollers Il andare journaled inv bearings I8 carriedbya pair'of cross bars I9 of langular shape, rwhich extend across-between the two sides and they slant "downwardly and rearwardly at a gradual inclination from theirreceiving ends. The husked rather ends toward their discharge corn Vis discharged from l' the ari-elevator 2| for rollers I'I extend gen- ,fA course, the rhvusking the machine and they erally l longitudinally ofr the .usualV manner 'and' 10 I6 inclinesvdownwardly e These huskingrollers I1 are 25` All the rollers I1 are 3,0VL

husking' rollers I'I 35I are varranged inA cooperating pairs in the usual 4o mannenthe'tworollers of eachpair rotatingin opposite directionsl to` form-a bight for the yhusks they illustrated embodiment,

the upper portions of thehusking'rollers I1 are provided with snapping recesses to secure a secondary snappingl action to releasev any ears that vmay be carried downwith stalks from` the snappingv rollers II. A cross shaft 22 extends between and is journaled in the sides 6 and 1 of of the various husking rollers I'I and this shaft meshing with beveled forward endsrof one gears 24'- connected to .the

Thel roller cfa pair carrying a gear ends rear end a pinion Z5 in mesh with a gear 26 attached to the rear end of the cooperating husking roller il of the pair and it will thus be seen that all the rollersI Il are properly driven, as the shaft 22 is rotated.

In accordance with the present invention, a plurality of feed decks l are disposed above the husking rollers Il between the sides i and 'l of the machine and to form in reality the bottom of a trough, the sides of which are composed largely of the side extensions 8 and l.V These decks are of channel-shapein transverse cross section with the sides of the decks projecting upwardly and the upper edges of the sides of the decks having forwardly and upwardly projecting teeth 21a formed therein. Attached by angular brackets 28 to the under side of each deck 2l are a pair of longitudinally spaced cap bearings 29. The forward bearings 29 receive within them the crank portions of a forward crank shaft 3l! which extends beneath and is journaled in the side walls 6 and 'l of the machine, while similarly the rear bearings 29 receive within them the crank portions of a rear crank shaft 3| which also extends between and is journaled in the sides 6 and l. The crank portions of the two crank shafts Sil and 3| are similarly formed and set and in the illustrated embodiment each crank shaft has four crank portions for cooperation with the bearings 29 for four decks 2'? and the various crank portions of each crank shaft are angularly displaced from adjacent crank portions by This permits of gyration of each deck 27 as aA unit as the forward crank shaft 3l! is rotated and it also permits differently timed gyratory motion to be imparted to the several decks.

Extending transversely between the sides of the various decks at longitudinally spaced pointsr are cleats 2lb which have upwardly and for-r wardly projecting teeth extending above the bot-` toms of the decks. The forward ends of at least certain of the decks 21 are equipped with bridging bars 32 which'project to points contiguous to the snapping rollers Il and as these bridging bars are originally secured to the bottoms of the decks 2T, a gyratory movement will be imparted to these bridging bars as the decks are actuated. These bridging bars curve upwardly somewhat from the forward ends of the decks 2l' so that when the bridging bars are in their iorwardmost position, the forward ends of the bridging bars will extend well into the bight between the two snapping rollers H, as best shown in Fig. 6. These bridging bars have teeth i320, formed as side flanges thereon and these teeth inclinefupwardly and forwardly. As shown in dotted lines, Fig'. 6, the forward ends oi the bridging bars gyrate through the circular path and in the direction indicated. The inner sides of the two outer decks 2! and both sides of the inner decks 2 have attached thereto upwardly projecting cord snapping plates 33. These plates project well above the upper edges of the sides of the decks proper and they have forwardly and upwardly projecting teeth 33a, formed at their upper edges. Between adjacent teeth 33a hookshaped notches 33h are formed, as best shown in Fig. 5 of the drawings. The cord snapping plates 33 extend from adjacent the rear ends of the decks 2l to points spaced slightly rearwardly shaped notches 35D extending to the forward ends of the corn snapping plates 33.

The various rollers i1 rotate in the directions indicated by the arrows in Fig. 3 and located above the rollers, extending longitudinally of the rollers, and bridging the space between adjacent pairs of rollers as well as the space immediately above the upwardly rotating portions of the two adjacent rollers of adjacent pairs, are guard bars 34 of inverted V-shape in vertical transverse cross section. These guard bars 34 have downwardly and outwardly projecting tabs at their respective ends attached to the bearings I3 for the husking rollers. Other guards 35 are attached to the sides and 1 respectively of the machine to extend longitudinally above the upwardly rotating portions of the outer rollers of the two outermost pairs of rollers I1. Vertical divider plates 36 of `right triangular-shape are attached to the guard bars 34 and these divider plates project upwardly from the peaks of the guard bars with the hypothenuses of the triangles slant-ing diagonally upwardly from points spaced rearwardly from the forward ends of the rollers a distance slightly less than half the length of the rollers. Side wings 31 and 38 respectively have attaching flanges secured to the divider plates 36 and these side wings are of greater width near their lower ends than at their upper ends, they incline upwardly and rearwardly from their lower ends toward their upper ends and they slant out from the divider plates 36, so that their outer edges are more rearwardly disposed than are the edges attached to the divider plates, all as shown in Figs. 2, 3 and 4. v

Secured to angular-shaped brackets 21o attached to the under sides of the various decks 2'! are a number of jostlers 39 `and 40. These jostlers are formed of sheet material having some flexibility, such as leather or rubberized belting material, and when the machine is at rest the jostlers lie in substantially vertical planes extending longitudinally ci the machine immediately above the bights between cooperating husking rollers i1. In the illustrated embodiment, each deck 27 carries two of the jostlers 39 and one jostler 4B, the jostler 4D being attached to the forward portion of a deck and the two jostlers Si@ being spaced rearwardly from the jostler di) and also being spaced from each other. The jostlers 39 have a series of teeth cut .in their lower edges and these teeth are capped by metal caps M of U-shape in horizontal cross section, the caps being secured in place by rivets or the like. The jostlers 4! have only one tooth at their lower ends, this tooth being capped by a metal cap ft2 similarly secured. When the decks 21 are in motion, the jostlers 33 and 40 have a gyratory motion in a vertical plane upwardly, forwardly, downwardly and rearwardly relative to the husking rollers H and they also, due to vibratory action, have a swinging movement transversely of the rollers I1, as indicated in dotted lines Fig. 3. y

Journaled in the side extensions and 9 above the forward portions of the decks 21 is a cross shaft A33. A sleeve 134 is journaled in the left side extension 8 on the shaft 43 and secured to this sleeve outwardly from the side extension 8 is a sprocket 45. he sleeve projects inwardly from the side extension 8 and carries near its inner end a pinion t. Journaled on the sleeve 4d and on the shaft 43 is a retarder drum 41 of hollow cylindrical shape, which eX- tends between the side extensions 8 and 9. This jacent the inner end of the sleeve 44 is an arm s 49 which has' journaled therein atits outer end I a stub shaft' 50 upon which is mounted a gear meshing with the pinion 46. This gear 5|,y

in turn, carries an eccentrically disposed pin 52 to which one end of a vlink 53 is pivotally con-J A nected. v The other end of the link 53 is pivotally connected to aflug 54 attached'to the innerv side Y of the retarder drum 41.

' 'RearWardly disposed from the retarder drum 41fand journaled at a somewhat higher level than the shaft 43- in the side extensions 8 and 9 is' a drum vshaft 55' to which av drum 56' is secured. The drum 56 extends'betweenthe side extensions 8 and 9 and this drum has a number n of radial blade-like portions withV concave portions joining adjacent blade-like portions.

The shaft 22, although it may be driven from anyy moving part of the machine,` is illustrated in the drawings as carrying lat its right'endk a vpui-- ley 51 which may be driven as by a-belt, not illustrated, from an engine such as that found on the ordinary farm tractor. The shaft` 22 may be driven in a vcounterclockwise direction, as viewed in Fig. 2. The crank shaft 30 carries adjacent its left end a sprocket 58 over which.

is trained a sprocket chain'59 andnthis sprocket chain 59 also worksover a sprocket 50 carried at the left end ofshaft 22. Accordingly, the crank shaft 3|) will be rotated also in a counter clockwise direction, ras viewed in Fig. 2i. lThe rotation of the shaft 3|! will impart gyratory movement to the various decks 21, first -upwardly then forwardly then downwardly and thenrearfwardly successively relative to the snapping rollers I|. Asv bridging bars 32 are rigidly attached to the decks, these bridging bars willhave similar movement. Also as the jostlers'v 39 and are attached to the decks, they Will similarly gyrate. Of course the toothed sides of the decks will move with the decks as will the cord snap ping decks 33. .n

Thesleeve 44 for the retarder is driven from the crank shaft 3|) through thel medium of a sprocket 6| attached to the crank shaft, a sprocket chain 62 and a sprocket 63 attached to the left end of the sleeve 44. Accordingly, the

sleeve 44 is driven in a counterclockwise direction,

as viewed in Fig. l. l

To drive the drum shaft 55 a stuby shaft 64 is mounted in-the left side extension 8 .andxthis stub shaft carries a sprocket G5. lA sprocket chain '55 is trained' over the sprocket 65 vandA a l sprocket 61 carriedat the left end of the drum shaft 55. The lower run of this sprocket chain 66 alsor passes over the sprocket attached to sleeve 44 and motion is'imparted tothe sprocket chain 66 through themedium of the sprocket 45. With this arrangement, it will be seen that the drum shaft will be driven in a'clockwise direction, as viewed in Figs. 1 and'2, and that, accordingly,

the drum 56 willA be driven in a clockwise direc'- tion. To drive the retarder shaft 43, drum` shaft l 55 is equipped at its' right endwith a sprocket 68 and a sprocket chain 59 is trained over the sprocket 68 and a sprocket 10 carriedv at the right end of the shaft 43. Accordingly, the shaft 43 v' is driven in a clockwise direction,I as viewedin Figs.f1 and 2.4 v Y v As the shaft lliro-tates in a clockwise direction,

the arm 49 will besimilarly rotated but as the sleeve 44 rotates in a counterclockwisedirec- 'I tion,!the pinion 46 lwill be'rotated invr a. counter- `movement about the shaft 43, aswell as farotational movement about' the axis of the stub lshaft 50, will transmit through the link 53 eccentrically connected to the gear 5|, rst a movement to the retarder drum 41, first in one direction and 'then in the opposite direction, the

movement vintheclockwise direction as viewed in Fig.. 2, being greater than the movement in the Acounterclcckwise direction.

' Inoperating the machine bundles of corn tied c by cord in the usual manner, are thrown onto Thesejdecks are rall differently n timed, so that as one deck moves'forwardly, an-

the decks 21.

other deck moves downwardly, .a` third deck' moves vrearwardly andl a fourth deck moves upwardlyv The teeth 33a of the cord snapping 'plates 33' workinto the corn so as tocatch thecords tying the bundles of corn together in certain of the notches 33h. Ihe differently timed v gyratory movement of the decks. then causes the cords to be broken after beingv caught in the notches 33h. The decks, due to their gyrating action spread the bundles of corn longitudinally as well as laterally `and advance the `cornstalks toward the snapping yrollers ||,.v .This advancing action is created very largely by the vcord, snappingplates 33 which work on the main body of the corn and it is assisted by the transverse toothed cleats'21b` which advance'the finer and looser material.' As the material advances to a point beneath the drum 56, this drum, if the material hasy built upto a high enough point, acts to compress the material downwardly to a certain. extent, while feeding the upper runof the material towards the retarder. drum 41.' Also 's this drum' 56 acts in conjunction with the fore ward'teeth 33a `of the corn snapping plates to cause these teeth to catch into the 'corn and thereby engage occasional cords which may not have been broken by the more rearwardly disposed teeth of the cord snapping plates. The retarder drum 41' acts on the upper strata ,ofthe material, 'moving towards the snapping rollers: to prevent feed of too great quantities of `the material to the snapping rollers at one time. The lower portion of the retarder drum 41 moves first through a certain arc ina' forward direction and then vthrough a` certain arclessthan the first arc in a rearward direction and thus thisy 'drum'. tends yto spread out the material lengthwise of the machine and it prevents choking of the material at the point of entry of the material into the bight between thesnapping rollers. l

`rhe sides of the U-shaped decks 21 as well'as 'the' cord snapping plates 33 prevents cordsA and vmaterial from being carried to any appreciable extent between adjacent decks to interfere with the action of 'the decks. The bridging bars 32 as illustrated in Fig. 6, actually act to push the stalks pass von to the cutter bar l2 and the cutter i3, while the ears in unhusked condition drop down the deck i6 onto the receiving ends of the rollers il. The guard plates 3ft and 35, or course, prevent the ears from moving to points between adjacent pairs of husking rollers and the jostlers 4l! and 39, which have both a gyratory movement in a vertical plane as well as a swinging action in a plane transversely of the husking rollers ll, due to the natural vibration of the machine, strike and jostle the ears so as to agitato them and tend to align them anew with the bights between the husking rollers` In other words, the jostlers 39 and it give the ears of corn kicks which tends to turn the ears somewhat. In conjunction with the downward movement of the ears by gravity, these kicks imparted to the ears tend to bring the ears more in parallel alignment v with the husking rollers il and to bring different portions of each ear adjacent the bights oi these rollers, so that a much more thorough husking action is secured than would otherwise be obtained without the use of these jostlers 3S and lill. '.lihe divider plates 35 separate the ears into different channels after they have had some opportunity through the rotational movement of the'husking rollers li and the upper jostlers to align with the husking rollers. The wings attached to the divider plates 36 tend to retard the movement of the ears somewhat so that a morel thorough husking action can be obtained. Of course, the jostlers 39 and fili, the divider plates 36 and the wings 3l all work together to secure the desired thorough husking action, While the wings 3T tend to retard the ears the jostlers 39 tend to cause the husking rollers to take different holds upon the husks of corn. Of course, the jostlers 3S also assist materially in feeding the loose husks, stalks, etc. into the bight between husking rollers. The teeth at the lower edges of the jostlers 39 and lill are provided with caps di and l2 respectively, to prevent undue wear upon these teeth. The flexibility of the material forming the jostlers permits the vibration of the machine to give the jostlers the side swinging motion transversely of the rollers ll above referred to.

It will be seen that an eicient feeding and husking action is secured in a simple manner in accordance with the present invention. While the invention is described in connection with corn husking and shredding machines, it will be understood that it is not limited to such machines alone, inasmuch as the principles of the invention may be applied to other machines.

It will, of course, be understood that various changes may be made in the form, details, arrangement and proportions of the various parts without departure from the scope of the present invention, which generally stated, consists in the matter shown and described and set forth in the appended claims.

What is claimed is:

l.. In a corn` husking machine, pairs of cooperating oppositely rotating husking rolls forming bights therebetween, said rolls being parallel to each other and one pair oi rolls being adjacent to another pair, fixed guard plates overlying the adjacent halves of the two adjacent rolls of adjacent pairs directing the ears to the bights between cooperating rolls, vertical dividers xed carried by said guard plates and side wings attached to said vertical dividers, said side wings acting in conjunction with the dividers to retard the ears of corn passing over the rolls and to assist in aligning the ears with the bight between rolls.

2. In a corn husking machine, pairs of cooperating oppositely rotating husking rolls forming bights therebetween, said rolls being parallel to each other and one pair of rolls being adjacent to another, stationary guard Yplates overlying the adjacent halves of the two adjacent rolls of adjacent pairs, vertical dividers carried by said guard plates, side wings attached to said dividers and moving jostlers above the rolls adjacent saidA dividers acting in conjunction with the guard plates, dividers and side wings to assist in aligning the ears with the bights between rolls.

3. In a corn husking machine having snapping rollers, a gyratory deck for feeding material to thesnapping rollers, pairs of cooperating husking rollers underlying said deck vand having receiving ends receiving from said snapping rollers and discharge ends located at a somewhat lower level than the receiving ends, there being a bight between the husking rollers of a pair, vertical di.- viders projecting upwardly between adjacent pairs. of husking rollers, side wings attached to said dividers and moving jostlers carried by said deck, projecting downwardly therefrom adjacent said dividers and movable in respect to said dividers, said jostlers acting in conjunction with said dividers and side wings to assist in aligning the ears with the bights between cooperating husking rollers.

4. In a corn husking machine having snapping rollers, gyratory decks for feeding material to the snapping rollers, cord snapping members attached to and projecting upwardly from said decks and terminating at their upper edges in a multiplicity of forwardly inclined teeth with hook-shaped notches between adjacent teeth, pairs of cooperating husking members underlying said decks and having receiving ends receiving from said snapping rollers and discharge ends located at a somewhat lower level than the receiving ends, there being bights between the husking rollers of pairs, vertical dividers projecting upwardly between adjacent pairs of husking rollers, side wings attached to said dividers and moving jostlers carried by said decks and depending downwardly to points above the b-ights of said husking rollers and acting in conjunction with said dividers and side wings to assist in alinf ing the ears with the bights between cooperating husking rollers.

5. In acorn husking machine, pairs of cooperating oppositely rotating husking rolls forming bights therebetween, said rolls being parallel to each other and one pair of rolls being adjacent to another pair, said rolls having receiving ends located at somewhat higher levels than discharge ends, guard plates overlying adjacent portions of the two adjacent rolls of adjacent pairs and vertical dividers carried by said guard plates in spaced relation from the receiving ends of said rolls and slanting upwardly from said guard plates toward the discharge ends of the rolls.

6. The structure defined in claim 5, said guard plates being of inverted V-shape in transverse cross section to form ridges and said dividers projecting yupwardly from said ridges.

7. In a corn husking machine having snapping rollers, a gyrating deck mounted to move upwardly, forwardly, downwardly and rearwardly in the order named in contiguity with the snapping rollers for feeding material to said rollers, a pair of cooperating husking rollers underlying said deck and having receiving ends receiving ing upwardly and from said snapping rollers and discharge ends.

located at a somewhat lower level than their receiving ends, said vhusking rollers having a bight between the same, jostlers attached to said deck and depending vdownwardly therefrom' toA positions adjacent said husking rollers, said jostlers'v having iiexibility for lateral movement relative to said husking rollers and guard plates overlying the portions of the husking rollers remote from said bight, and vertical dividers carried bysaid guard plates in spaced relation from the receiving ends of the husking rollers and slantivng upwardly from said guard plates toward the discharge ends'.

of the husking rollers.

k8. In a corn husking machine, pairs of cooperating oppositely rotating husking rolls forming bights therebetween, said rolls beingfparallel to each other and onepair oflrolls'being adjacent to another pair, guard plates overlying the' adjacent 1 halves of the two adjacent rolls of adjacent pairs, vertical dividers carried by saidguard lplates and side wings attached to said vertical dividersysaid side wings acting in conjunction with the dividers to retard thel ears of corn passing over the rolls and to assist in aligning the ears with the bight between rolls, said dividers projecting upwardly from said rolls and having upper edges joining said guard plates' in vspaced relation from the re ceiving ends of the rolls, said upper' edges slanttoward thef discharge `ends of the rolls. f

9. In a corn'husking machine, pairs of coopereachother and yone pair of rolls being adjacent Nto another painguard plates overlying the adja- Vcent halves of the two adjacentrolls ofk adjacentpairs, vertical dividers 'carried by said y guard vplates and side wings 'attached to said vertical dividers,lsaid side wings acting in conjunction with the dividers to retard the ears ofvvcorn passing over therolls and to assist in raligningl the ears with the bight v,between rolls, said dividers being spaced from the receiving ends of the rolls and being of triangular shape Withthe hypothe- 'knuse edges of the triangle slanting upwardly and `toward the discharge ends ofthe rolls.

10. In a corn husking machine, kpairs of coopereach other and one pair of rolls being adjacent to another pair, guard plates overlying the adjacent halves of the two adjacentrolls of adjacent pairs,

vv-ertical"dividers carried bysaid guard plates and side wings attached. to saidvertical dividers, said side wings acting in conjunction with the dividers. to retard the Vearsof corn passing over the rolls and to assist inV aligning'the ears-with the bight j betweenfthe rolls,.said wings .slanting outwardly and 'somewhattoward the dischargeA ends ofrsaid ating oppositely rotating husking rolls forming bights therebetwen, V'said rolls being parallel 'tof ating oppositely rotating husking rolls forming L bights'therebetween, said rolls being Yparallel to

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