US3065551A

US3065551A - Reel dryer

Info

Publication number: US3065551A
Application number: US673474A
Authority: US
Inventors: Cohn Samuel; Cohn Eugene; Catallo Frank
Original assignee: Samcoe Holding Corp
Current assignee: Samcoe Holding Corp
Priority date: 1957-07-22
Filing date: 1957-07-22
Publication date: 1962-11-27
Anticipated expiration: 1979-11-27

Description

Nov. 27, 1962 s. coHN ETAL 3,065,551

REEL. DRYER Filed July 22, 19457 6 Sheets-Sheet v1v Nov. 27, 1962 s. col-1N ETAL REEL DRYER 6 Sheets-Sheet 2 Filed July 22, 1957 mu., TORNEYS SA-M EUG .B2 FRANK CATALLO m4, l

, pfff Nov. 27, 1962 s. col-1N ETAL REEL DRYER Filed July 22, 1957 6 Sheets-Sheet 3 "Hum lNvENToRS SAMUEL coHN I Il EUGENE coHN BY FRANK cATALLo l wwf ATTORIG Nov. 27, 1962 Filed July 22. 1957 MMF/? 8 FIG. 9

S. COHN ETAL REEL DRYER 6 Sheets-Sheet 4 Flos' INVENTORS SAMUEL COHN EUGENE COHN BY FRANK CATALLO fm www, @ma am@ W ATTORNE S NOV. 27, 19621 s.. COHN ETAL 3,065,551?

' REELDRYER Filed July 22 14957 l e sheets-sheet es` 7&6

INVENTORS SANUEL COHN EUGENE COHN FRANK CATALLO States This invention relates to apparatus for drying and conditioning textile fabrics. While the invention may be described more particularly in connection with the treatment of tubular knit materials, it may be utilized in handling woven materials and other forms of knit goods, as may be desired.

In connection with the treatment of many textile materials, it is frequently necessary to dry the material, as by passing the material in contact with dry, heated air. After drying, the material may be further processed, and eventually wound into rolls or folded. One form of apparatus for drying a web of material is shown in United States Patent No. 2,637,991, to S. Cohn, et al., issued May 12, 1953. This apparatus comprises a large housing in which are supported 4a plurality (usually 6) of large diameter dryer reels arranged in staggered relation. A web of moist material enters the housing at one end and passes sinuously -about the dryer reels, in series. As the material passes about the reels, streams of heated air are directed toward the exposed surface of the material, so that the moisture is driven from the material and carried away by the heated air. The present invention relates to a dryer apparatus of this type which is characterized by certain specific structural and mechanical improvements which render the apparatus more versatile and more efficient in its operation.

One of the specific aspects of the invention resides in the provision of a reel dryer unit of modular design, which is adapted for use individually or in combination with one or more similar units to effect the continuous drying of an elongated web of material. In this respect, the requirements of various material processing businesses vary widely in respect of the desired capacity of drying apparatus. Thus, some materials are more easily dried than others, and some material conditioning operations impart more moisture to the material than others. Accordingly, the present invention seeks to provide a dryer unit which, by itself, has a desired capacity suitable for a business having minimum capacity requirements, while at the same time being adapted for use in tandem or multiple arrangement to suit the capacity requirements of all processors. More specifically, the invention provides an improved modular drying unit having a pair of dryer reels disposed one above the other in a more or less rectangular housing. The operative elements of the dryer unit are such that the material enters the dryer housing horizontally, passes first about one and then the other of the dryer reels, and then passes horizontally out of the housing at substantially the same level as it entered. lf the nature of the material and/ or the preceding treatment is such that additional drying capacity is required, two or more of the modular drying units may be placed end to end, in series, so that the material may be passed through as many units as is required.

As the material passes through the dryer units, it becomes heated to a substantial degree and leaves the last dryer reel at a relatively high temperature. Accordingly, it is desirable that the material lbe cooled prior to leaving the dryer housing, and it is one of the specific features of the invention to provide an improved arrangement for `directing streams of cooling air upon the opposite surfaces of a web of material as it leaves the dryer housv v 3,065,551 Patented Nov. 27, 1962 ice ing. Further, in this respect, the modular dryer unit of the invention includes means effective when two or more dryer units are arranged in series to convert the cooling means of all dryer units except the last to means for further heating and drying the material. To this end, the dryer units include novel structural arrangements which permit the units to be readily adapted to the requirements of the user.

Another specific feature of the invention resides in the provision of improved `arrangements for circulating dry'- ing air through and about the web of material as it passes over the dryer reels. To this end, the opposite ends of the dryer reels are fully opened to a low pressure chamber leading to the intake or intakes of one or more blower devices. The arrangement is such that air passing through the fabric and into the center portion of the dryer reels ows uniformly from each end of the reels, to effect uniform drying of the fabric across its entire width.

During the process of drying the material, the drying air becomes laden with moisture and must be discharged and replaced with fresh, relatively moisture-free air. In this respect, one of the improved features of the invention resides in an arrangement for drawing cool, relatively moisture-free air into the dryer housing and discharging such air over and about the bearings of the blowers. By this means, the bearings of the blower are maintained at a lower temperature and therefore have a longer operating life. g

As a general rule, moist material passing through 'a dryer will tend to shrink to some extent as the moisture is removed progressively therefrom, and the material enteriing the dryer will be -traveling at a greater rate of speed than when it leaves the dryer. For this reason, it is corrventional to utilize the Imaterial itself to control the speed of the dryer reels and other related apparatus. This may be accomplished by providing suitable 4dancer rolls which contact the web of material and operate to slow down or speed up the individual reels and other appara'- t'us in accordance with the tension of the material. known arrangement for this purpose is disclosed and claimed in United States Patent No. 2,301,249, issued November l0, 1942, to H. W. Butterworth, Jr., et al. In accordance with one -aspectof the invention, an im"- proved arrangement is provided for controlling the operating speeds of the various drying rolls and other apparatus whereby the speed control is rendered'highly sensitive and quickly responsiveto the condition of the material; so that undesirable looseness or tension in the material is minimized. v Y

A'further feature of the invention resides in the provision of arl-improved folder apparatus which maybe advantageously utilized to receive the clothV after drying and form it into neat, at folds. The improved folding apparatus may be constructed generally in accordance with United States'Patent No. 2,761,678, but incorporates certain novel features which simplify the construction and operation of the apparatus.

Other features of the invention relate `to specific structural features of the modular dryer unit which simplify the manufacture thereof and render the apparatus-more suitable for its intended purpose. v

For a better understanding of the invention, reference should be made to the following detailed specification and accompanying drawings in which: l

FIG. 1 is a side elevation of the improved modulator dryer unit with parts broken away to illustrate certain features of construction;

FIG. 2 is a cross-sectional view taken generally along line 2'2 of FIG. '1;

FIG. 3 is a fragmentary front elevation of the dryer unit of FIG. 1, showing adjustable air intake doors incorporated therein; t 1

` themehusmofPIG; 9; f i t t t 11j is a 'simplierL shentatic!representationof an'` t,

' FIG. i2 listy signifi" p. ya.

' istan enlargedfrargnientary viewoftlieappara-j y tusy of` FIG.` l, illustrating details of the controlniea'ns utilized ytherein):for` regulatingthe `speedof` theft-drying rolls*` and` other apparatus; A.

discharging,heatedairuponthe material; j

f filGlvfs a fragmentary elevation of 'an improvec'iA fold fing device Which'may be `at,irvantageously usedwitliv `tite "10 'is an enlarged fragmentaryjtop pian paLriOf dry u v erwwitlrone 'signicjant aspect .of the invention.

eof, h fereneenurieralvlt) defsignate'sgenerally' Withers/e120 is passend mi zi, joel-mated in been w'thevrel 2th,;V t. p A. x f .undingithe upperportionof theupperireelz side of the reel :asshow'n in FIG. 2,

ani inner VWall in fthe form of tu 19st] 'tfre s s ,Y t, reel from oneside to the 'other' thereof. AA duct Zt'gris also .poifusd y about the lower reel f2.1. the louer @dw 1 261 l n laei K40i. substantially the Same nstructinfas theupper .du zbukustallsd fiuinvertedrrelation whereby the .up -pouou Otthe'luwetreel is @Xpdf i n the n -ht 4hang end .ofv the V'housing 10, as, yiewed in lFIGLSLS an enlargedfragmentaryfrossiseetional view" iewef;

ing "now 'tol the ilram''rigsy and initially 'to FIGS." i

erallyl.invertedy U-lslhaped forni, which X;;

'ally 'about' tite reel jiforj about" thev lower portion kof thereel` t are blowers, 217,.,28'. fwhsh are. advantageously .ot atypeomprising squirreleagerotor members 29 lhav-y M fing intake openings at their opposite axialienda` I The` `stanntial` sizey ineludingthe .end areas of thereels them.-

enti

toV

, p 20" ed," schematic representation illus# ,f t

unitsy arranged in tandem f itiI auf outletsgt), 31 of the Vrespective Vblowers "27,` 28 rdiseharge" intothe ductsz, 4k2,6,to supplyair underpressure tothese j ducts As shown initio. '2t meanest/aus `11,; iaeffthetheus! f estuaire spaced outwardly ofvthtopen eudsofthedwt er reels 20,121,and,defineIrelarivelyfflrgend chambers" 32, 33 in the "opposite sides ofy the housing." lflieend y @Jambers-32,533 @rein Y0.121211,com'mutiication with, the .interim of thedryer reels 20,` 2.1,.and are `also jucorn-fi 4 municaton withthe intake openings at the opposite-ends the bluiver, rotors .297., dAdvantageously, heaters-34, 35,`

f `inletopening "36.y An exhaust fan 52 is housedin an e exhaust stack 53 foijdrawing moisture-laden air out of.

.e .l 5o sot air to be discharged 'toward the selvesitogether with thear'eas ofthe end Walls` ofthe hot air` ducts ,23. The Widthtof the eudfehambers is quite'silb-y `stautial and.' iny any event, sutcently` largerv to'` eccoti modate the heaters 34,735 disposed .between the end walls of thehot air duets and the side Walls 11, .12 of `tlie housv ting. Trione parti'eulerly ladva'ritageousrembodiment ,of they ruventikn,Yspecieally` illnstratedfherein', the width of they y fendcltamhers iSkin 'excessof A59% of the diameter. :of the` ,Y Approximately centrally locatedin the iront walllS of Y thehousing ishorizontally elongated opening StthrongllL fwhicha web"joff'inateriall' is passed,` A guide orfintake y f roller"` 38 is mountedadjaeent the opening and serves f t'opgnide the `web of ymaterial'37"through the openingiu f vtheA desired'triannert` the'illustrated form of the inven-` tion,f`irt is contemplated that the `roll 3S Willbe drivembyv a suitablelmefans'to be described, the `speed ofthe roller V38 beingdetermined Vautcznnatizally by the condition .of `the material astit leaves pre''eedingtpequipment; The 'materiali` entering thehousingltispassed about a'danser roll 39, l i .supported by pivoted arm 4,0;l and is then vpassed about' i f f'afsubstnt'ial `portion (approximately 2,40 tilegrees)` of the peripheryxof *tlieiuppetf .dryerreel 2t?. t; As the `material "lj l ylaat/'es the upper reelfztl it ispassed abou a second dancer "roll 41 ysupportedY byI afounter-weighte 'plvoted armrtifz.` t e and'-i`sq their passed! about. a substanti di du ally.. @distinguished imm L in tandem' er, multipley t e. y l' ,the 'dryer' apparatus is"Y in; operationi the" blowers 21.128 are `directing heated` Aair Junder pressure into the i hotainducts23f26 surruudingdryer reels 2%,"21, and f Astreariis` of thelheated air are? discharged from the ytransi verse openings Y 25J toward the surfaces ofthe reels. As*

thematerial' passes co-secutivelyabout the lipl and u rlowerrreelsrz, 21, rstone side 'andjthen the other of the` 't material is `exposed .to thefstreams of heated aipjso' that moisturelris picked up bythev 'air,andi-thtreby removed i front/the material. VThefrriaterial,of coursegis of' a pertuis riettztire,as4 are the surfacesof the dryer reels/Ztl, i `21,- 'sotl'iat'tlie streams of fheatedu'ir directed radially 'toy YWand the wdryer u reels passy tln'ougii` VAthe material and `tlnfougti thezouter walls of` thereels. Trie moisturelatlen-pv kaiijin lttieinterior olf the rels `is drawn axially out of the reels, "from the oppositejendsthereof intothe low, pres-` f sure chambers 32, Y3? The air Vis otlaiirbe'ris'32,*` 33` through thelieatersf 34,' '735, into the` t intakes tf the respective blowers Z7,28;forreeircuiation As thudryiug operation piogressesytlie eir'cireulatng whichY extends .downwardlyalohgsfthe `frontWall 13 of` thehousing`, terminating'at orslightly above the material theharobers 32,@331; asvwellasy for drawing in any han' drawn from the llustrated'in FIG. 8, to "DeV described in greater' stack 53 is provided with an adjustable damper '54 to provide for regulation of the exhausted air.

As moisture-laden air is exhausted from the housing 10, such air must be replaced with fresh air from the atmosphere. Advantageously, at least a portion of such fresh air may be drawn in through small intake ducts 55, 56' (see FIG. 2) which have inlet openings exposed outside of the housing and discharge outlets adjacent the bearings (such as indicated at 57) of the blower rotors 29. The arrangement is such that fresh, cool air ilows in through the duct 55, 56 and is discharged over and about the bearings 57 to aid in maintaining such bearings at a relatively low operating temperature.

In the illustrated apparatus, additional means are provided for admitting fresh air into the housing 10, to` provide for an increased supply of fresh air where desired. Thus, as shown in FIG. 1 and FIG. 3, directly below the material inlet opening 36 is a fresh air opening 58 which may be controlled-by a pair of sliding doors 59, 6ft. The opening 58 communicates with the

end chambers

32, 33 leading to the intake openings of the blowers 27, 28. The doors S9, 60 may be advantageously positioned at any point between fully opened and fully closed positions to facilitate regulation of the supply of fresh air.

Asthe material travels around the dryer reels 2li, 21 it lbecomes heated to a relatively high temperature, and it is therefore advantageous to col the material somewhat before it is further processed, as by the folder in FIG. V8. To this end,'the new dryer unit is provided with cooling air ducts 61, 62 which are respectively above and below the chamber 48 and, in elfect, define the chamber 48. As shown in FIG. l, the cooling air ducts 61, 62 are horizontally disposed and extend for a substantial length in the direction of movement of the material. At their outer ends, the ducts 61, `62 are connected to the outlet of a blower 63 arranged to draw air from the atmosphere. Cool air supplied to the ducts 61, 62 is discharged therefrom through transverse slots or` openings 64 extending transversely of the material, whereby streams of cool air are directed upon the opposite surfaces of the material.

In accordance with the invention, the cooling chamber 48 is isolated from the heating or drying chamber by means of the sealing rollers 46, 47 between which the material passes before entering the chamber 48. As shown in FIG. l, sealing rolls 46, 47 are in contact with the material and, at their opposite sides, are in close proximity to

walls

65, 66 of the

hot air ducts

23, 26. The arrangement is such that the rollers 46, 47 effectively isolate the heating and cooling chambers, while permitting the material to move freely from one chamber to :the other.

Cooling air discharged into the chamber 48 is, in part, exhausted therefrom through opening 67 at the opposite sides of the chamber, near the outer or right hand end thereof. In addition, some of the air ilows along with the material and is discharged at the end of the chambe 48. i

On of the important features of the invention resides in the modular design of the dryer unit, whereby two or more units may be arranged in series relation to provide increased drying capacity. In such cases, it is generally not desirable to provide for cooling of the material as it leaves one dryer unit 'and travels to a subsequent unit. Accordingly, when two or more dryer units are used in series, the blower 63 is removed, as by removing bolts 68 which secure the blower housing to the dryer unit. In addition,

removable walls

69, 70 at the inner ends of the cooling ducts 61, 62 are taken out, so that the ducts 61, 62 are in direct communication with the

hot air ducts

23, 26. With this arrangement, hot air is supplied to the ducts 61, 62 and is directed upon the material as it travels through the chamber 48. The invention contemplates that, as the material emerges from the outer end of the chamber 48, it will pass directly into a sub- 6 sequent unit for further drying. The number of units employed may be as high as necessary to provide the desired drying capacity, and it will be understood that the last one of the units will generally be arranged to cool the material as it passes through the chamber 48.

One of the improved structural features of the invention resides in the construction of the

hot air ducts

23, 26, as shown in greater detail in FIG. 7. In accordance with known design principles, it is desirable to provide the hot air ducts with a large plurality of closely spaced openings disposed transversely of the material and extending across its width, whereby as the material travels about the

dryer reels

20, 21 streams of hot air are directed upon the mate-` rial to promote eiiicient drying of the material. The nvention provides an improved and simplified structural arrangement for providing the desired slots in the hot air ducts with a minimum of manufacturing cost, and in a manner such that the construction of `the duct work is generally simplified. Thus, in accordance with the invention, the hot air ducts may be formed of a pair of generally

U-shaped side panels

71, 72 which are positioned at the opposite ends of the

dryer reels

20, 21. AExtending between the

side panels

71, 72, at closely spaced intervals are channel shaped members 73 having tab portions 74 at the ends thereof which are `bent at right angles to the members 73 and overlap the

side panels

71, 72. The arrangement is such that the channel shaped members 73 may be rigidly secured to the

panels

71, 72, yby 'bolting or otherwise securing the tab 74 to the respective panels. As shown in FIG. 7, the channel shaped members 73 are disposed in parallel lrelation and are spaced a short `distance apart whereby to dene between them elongated slots or openings 75 extending from one side to the other of the ducts. The side walls or anges of the channel shaped members 73 are divergently related, so that openings 75 between adjacent channel shaped members 73 are more or less in the form of convergent nozzles. The arrangement is such that air is discharged from the openings 75 in relatively concentrated streams, and considerable turbulence is set up ybetween adjacent openings to promote efficient drying of the material.

In order to reduce the flow of air axially from the ends of the nozzle-like openings 75, small baffle plates 76, of generally trapezoidal form, are secured to the

panels

71, 72 to restrict ends of the openings 75. A slight owof air axially Vfrom the spaces between the hot air ducts and the dryer reels is not particularly objectionable.

In a normal drying operation, it can Ebe expected that the material will shrink somewhat as the moisture is removed therefrom and various tensions in .the threads of the material are relieved. To accommodate such shrink'- age and to prevent the material from being unduly stressed, it is conventional to utilize the various dancer rolls 39, 41', 44 to control the speed of the reel 20, reel 21 and the related processing or handling apparatus, such as the folder of FIG. 8. In addition, the speed of the intake roller 38 is usually controlled by a dancer roll (not shown) which is carried by the equipment preceeding the dryer. Controlling the operation of lthe various components of the apparatus in this manner is, of course, well known in the general sense, and is described in United States Patent 2,301,249, issued November l0, 1942, to H. W. Butterworth, Ir., et al. However, in accordance with one aspect ofthe invention, improved control arrangements are provided whereby the operation of the apparatus is rendered more sensitive and more responsive to the condition of the material. A typical such arrangement is shown in FIG. l2.

Referring now to FIGS. l and 4, there is shown an improved control arrangement for controlling the speed of the dryer reel Ztl in accordance with the condition of the material approaching the reel. It lwill be understood that the control arrangements -for other components of the dryer unit and related apparatus are similar, and the illustrated control apparatus may be considered represen,-

back and forth along the support 107 while simultaneously feeding the material 37 downwardly, so that the material folds back upon itself successively, in a series of flat folds.

While the folding mechanism shown in FIG. 8 may be otherwise as generally described in the aforementioned Patent No. 2,761,678, the apparatus of the present invention incorporates certain specific improvements relating to the movement of the guide rollers 105, 106 back and .forth on the overhead support, while simultaneously positively feeding the material downwardly toward the pile 108. Thus, with reference to FIGS. 9 and 10, the supports 107 comprise horizontally disposed angle members 109 having on their upper Surfaces elongated track members 110. The track members 110 are spaced apart a distance somewhat greater than the maximum Width of material to be handled and have upper surface portions of inverted V-shaped cross section.

Guide rollers 105, 106 are supported by shafts 111, 112, respectively, which extend axially from the ends of the guide rollers, and adjacent the outer ends of the shafts 111, 112 are pulleys 113 having V grooves therein, the pulleys being arranged to be supported on the track members 110, for movement therealong. Advantageously, the track members 110 and pulleys 113 are so arranged that the pulleys 113 frictionally grip the track members, whereby upon movement of the pulleys along the track members the pulleys will be caused to rotate.

' y In accordance with the invention, the pulleys 113 are rotatably supported on the shafts 111, 112 and are rigidly connected to the driving elements 11451 of overrunning clutches 114. The driven elements 114b of the overrunning clutches are keyed or otherwise secured to the vguide roller shafts, whereby the guide rollers 105, 106 may be driven in one direction by rotation of the pulleys 113. In accordance with the invention, the overrunning clutches 114 are so arranged that the respective guide rollers 105, 106 are adapted to be driven in opposite directions.

Shown best in FIG. 10, the guide rollers 105, 106 are spaced a xed distance apart by means of links 115 which engage projecting end portions of the shafts 111, 112, the spacing being such as to permit the web of material 37 to pass betwen the rollers while being gripped thereby.

Keyed or otherwise secured to the respective guide roller supporting shafts are gears 116 which are arranged in meshing relation, so that upon rotation of one of the guide rollers, the other guide roller is caused to rotate at the same speed in an opposite direction. The arrangement is such that Irotation of the guide rollers causes the web of material to be fed downwardly between the rollers, with each of the rollers exerting a driving influence upon the material.

In order to move the guide rollers 105, 106 back and forth along the track members 110, a drive chain 117 is provided, the drive chain being entrained about sprockets 118, 119, the latter sprocket being driven synchronously with feed roller 104. One of the links of the drive chain 117 is pivotally connected to a driving arm 120 which, in turn, is pivotally connected to the shaft 111, by means of a` bearing assembly 121. Accordingly, as the chain 117 moves undirectionally throughout its cycle, the guide rollers 105, 106 are moved rst in one direction and then the other along the track members 110.

As the guide rollers move in one direction along the track members 110, the pulleys 113 supporting both rollers will be caused to rotate in the same direction. In accordance with the invention, however, the arrangement of the overrunning clutches 114 is such that only one of the clutches will drive its associated guide rollers. For example, if the guide rollers move from right to left, as viewed in FIG. 8, the clutches associated with the guide roller 106 will be operative, and the guide roller 106 will be driven in a counterclockwise direction. At the same time, the guide roller 105 will be driven through the gears 116 in a clockwise direction, the clutch 114 associated with this guide roller merely overrunning during such rotation. When the rollers 105, 106 reach their innermost limit of right-to-left movement, and begin to move from left to right, the clutch associated with the roller becomes operative, while the second clutch begins to overrun. This causes the roller 105 to be driven in a clock- Wise direction by its clutch, while the roller 106 is driven in a counterclockwise direction through the meshing gears 116. The arrangement is such, as will be readily understood, that the rotation of the guide rollers is the same regardless of the direction in which the rollers move along the track members 110.

In the normal operation of the folding apparatus of FIGS. 8-10, the guide rollers 105, 106 are moved continuously back and forth along the track members 110 at a rate corresponding to that at which the material is fed around the

rollers

102, 103, 104. The feeding of material downwardly through the guide rollers 105, 106 takes place at a corresponding rate, so that the material is laid in neat, flat folds upon the pile 108.

The apparatus of the invention incorporates several advantageous features providing greater versatility in the use of the apparatus and improving the efficiency of the operation thereof. The new modular drying unit is so designed as to provide a complete unit having a drying capacity suitable for businesses having minimum drying requirements. Thus, material processors having such minimum requirements may reduce equipment expense to a practical minimum and at the same time realize a substantial savings in factory floor space. Businesses requiring additional drying capacity may utilize the modular units in multiple arrangement, in a manner best suited to their particular demands. Thus, in all cases, the drying apparatus may be utilized with maximum effectiveness.

One of the advantageous features of the new modular unit resides in the ease with which the unit may be alternatively adapted for individual or multiple use. In this respect, a dryer unit adapted for individual use, or for use as the last dryer for a multiple series, advantageously includes means to cool the material as it leaves the dryer. In accordance with the invention the means to cool the material may be readily converted into means to heat the material, whereby to add additional drying capacity to the dryer units, where appropriate and desirable. The new dryer unit also incorporates several advantageous structuralfeatures, including an improved structure for the hot air ducts, improved arrangements for directing the flow of drying air uniformly across the material, and `irnproved arrangements for drawing fresh air into the dryer to replace moisture-laden air discharged therefrom.

Another important'advantageous feature of the invention resides in the provision of improved control arranger ments for regulating the speed of various material conveying components of the dryer and of apparatus related thereto. To this end, the invention incorporates a simple fluid driven motor, actuated by a fluid system including a solenoid-operated cut-off valve and a variable pressure regulating valve, the latter being operated automatically in accordance with the condition of the material adjacent the respective conveying components. The new control arrangement is highly sensitive and responds quickly to changes in the condition of the material, so that the traveling web of material is maintained under desired tensions at all times.

The invention also provides improvements in folding devices, advantageously used following drying operations, whereby a pair of material-feeding guide rollers may be caused to move back and forth over a support while simultaneously feeding the material thereto, so that the material is laid in a series of at folds. In this respect, the invention provides a simplied and improved mechanism for driving the guide rollers to feed the material in the manner desired.

It should be understood, however, that the specic ap- UNITED STATES PATENT oEEICE CERTIFICATE OF CORRECTION Patent No. 3,065,551 November 27, 1962 Samuel Cohn et al,

lt is hereby certified that error appears in the above numbered pat-a ent requiring correction and that the said Letters Patent should read as corrected below.

Column 5, line 27, for "col" read cool 1-; line 59, for '"On" read One column 6, line 58, for "preceeding" read preceding --5

lines

67 and 68, strike out "A typical such arrangement is shown in FlG l2," and insert the same after 48H, in line 5, same column 6; column 8, line 25, for "The" read Similar means may be utilized to control the column 9, line 62, for "'undirectionally" read unidirectionally column ll, lines 24, 32, and 36, for the claim reference numeral "'2", each occurrence, read l Signed and sealed this 22nd day of October 1963 (SEAL) Attest: EDWIN L. REYNOLDS -EIPLS'I W. SWIDER Attesting Officer Ac ting Commissioner of Patents