US2710044A

US2710044A - Single facing machine

Info

Publication number: US2710044A
Application number: US432690A
Authority: US
Inventors: Hobart W Bruker
Original assignee: Individual
Current assignee: Individual
Priority date: 1954-05-27
Filing date: 1954-05-27
Publication date: 1955-06-07
Anticipated expiration: 1972-06-07

Description

H. W. BRUKER SINGLE FACING MACHINE June 7, 1955 6 Shets-Sheet 1 Filed May 27, 1954 INVEN h osmer WBEUKEE.

M MT Luz ATTORNEYS.

June 7, 1955 H. w. BRUKER 2,710,944

SINGLE FACING MACHINE Filed May 27, 1954 6 Sheets-Sheet 2 IN V EN TOR.

Hos/war WERUKER.

BYIM MTL-MZ June 7, 1955 H. w. BRUKER 2,710,044

SINGLE FACING MACHINE Filed May 27, 1954 6 Sheets-Sheet 3 IN V EN TOR. HOBART WBEUKEE.

{ w vw A TTORNEKS.

June 7, 1955 H. w. BRUKER SINGLE FACING MACHINE 6 Sheets-Sheet 4 Filed May 27, 1954 A TTOANEYS.

June 7, 1955 H. w. BRUKER 2,710,044

SINGLE FACING MACHINE Filed May 27, 1954 6 Sheets-Sheet 5 IN V EN TOR. Hos/i g1 WBEu/nse. B Y

M M m$* M June 7, 1955 H. w. BRUKER 2,710,044

SINGLE FACING MACHINE Filed May 27, '1954 6 Sheets-Sheet 6 INVENTOR. HOBART WBEUKEE.

BY 6 E I F i 2 Z M IF M m ATTORNEYS.

United States Patent Office 2,110,644 Patented June 7, 1955 SINGLE FACING MACHINE Hobart W. Bruker, Bordentown, N. J., assignor to George W. Swift, J12, Incorporated, Bordentown, N. 1., a corporation of New Jersey Application May 27, 1954, Serial No. 432,690

8 Claims. (Cl. 15431) The invention relates to single facing machines of the general type which have been used for many years in the production of single faced corrugated paper, wherein a paper web to be corrugated first passes between a pair of fluted corrugating rolls, then adhesive is applied to the peaks of the corrugated web as the latter travels part way around with the second corrugating roll While held in the flutes of the latter, and finally a facing sheet is pressed into contact with the gummed peaks of the corrugated web by a pressure roll, while the corrugated web is traveling around the second corrugating roll as above mentioned, to form single faced corrugated paper.

In machinery of the above type, it is important that the periphery of the pressure roll be positioned with extreme precision in respect to the peaks of the flutes on the second corrugating roll, i. e., close enough to insure that the facing sheet will be firmly pressed into contact with the gummed peaks of the corrugated paper web, but not so close that the pressure may be high enough to injure the paper webs or overstrain the machine.

The above considerations require that the position of the pressure roll be altered whenever paper webs of different thickness are being run through the machine. The pressure roll is customarily located at a lower level than the second corrugating roll, and heretofore it has long been conventional to provide the pressure roll with adjustable bearings, usually of the eccentric sleeve type, which are adjusted angularly through reduction gearingJoperated by a hand wheel, to alter the position of the pressure roll in accordance with the thickness of the paper running through the machine. During adjustment of the pressure roll, the latter was moved upwardly toward or downwardly away from the second corrugating roll, and the weight of the roll (usually amounting to several thousand pounds) had to be lifted in moving it closer to the second corrugating roll. Thus the last mentioned adjustment was particularly hard to make, against the weight of the roll, and the above mentioned reduction gearing was provided in an effort to ease the load, the weight of the roll being borne by the adjusting mechanism.

In prior pressure roll adjustments of the above character, the pressure roll moved substantially directly toward or from the second corrugating roll during adjustment. The resulting alteration in spacing between the two rolls accordingly was substantially as great as the movement of the pressure roll during adjustment. This has it difficult to secure the requisite precision in spacing.

Also it has long been customary in the art to interpose a spring in the pressure roll adjusting mechanism, the intent being to allow the pressure roll to move away from the adjacent corrugating roll in case material of abnormal thickness should pass through the machine. Heretofore this spring relief action was obtained only after the force tending to separate the rolls had been transmitted through the above mentioned reduction gearing to the spring, so that the reduction gearing impeded the action of the spring when quick relief of the pressure between the rolls was needed.

The present invention aims primarily to overcome the above mentioned shortcomings in the machine. In accordance with the present invention, the pressure roll is positioned beneath and somewhat laterally ofiset with respect to the second corrugating roll, and is provided at its opposite ends with supporting members which bear the weight of the roll and are mounted to afford movement of the sheet pressing portion of the periphery of the pressure roll in a substantially horizontal path, which path is directed at a relatively small, oblique angle to the adjacent lower portion of the periphery of the second corrugating roll. Accordingly, no substantial portion of the weight of the pressure roll has to be lifted or otherwise borne by the adjusting mechanism during adjustment, in other words the adjusting mechanism is relieved of the weight of the pressure roll so that no reduction gearing is needed therein as heretofore, and the adjusting mechanism acts easily and freely in both directions during the precise adjustments measured in thousandths of an inch which are needed to conform to different thicknesses of paper, as well as when quick spring relief is needed as above mentioned. During adjustment, the resulting alteration in spacing between the rolls will amount only to a fraction of the movement of the pressure roll, thus promoting greater precision in the correct positioning of the pressure roll.

In another aspect, the invention comprehends a single facing machine which in addition to fine precision adjustment of the spacing of the pressure roll toward and from the second corrugating roll, to conform to different thcknesses of paper passing through the machine, provides for the wide range movement of the pressure roll assembly away from the section of machine which carries the second corrugating roll, the pressure roll assembly being readily disconnected from and coupled to the remainder of the machines as needed. In the operation of single facing machines, it has long been necessary after every run of about eight hours, to shut down the machine and clean off from parts thereof which are underneath the second corrugating roll, accumulations resulting from excess adhesive carried over from the adhesive applyingrnechanism of the machine. For many decades, these cleaning operations have been the bane of the operators of such machines, particularly in the required cleaning of the lower end portions of the arcuate guide members used in such machines, which project under the second corrugating roll. A large number of these guide members is required, spaced a few inches apart across the full width of the second corrugating roll, and in single facing machines as long heretofore constructed, the guide members have been made accessible for cleaning, by withdrawing the adhesive applying mechanism toward the entrance end of the machine and reaching in from the sides of the machine, which has long been an exceedingly awkward and difficult operation. The above mentioned wide range movement of the pressure roll .away from the second corrugating roll, i. e. toward the delivery end of the machine, provides a transverse aisle between the second corrugating roll and the pressure roll, which the operator may enter to clean the parts underneath the second corrugating roll. Thus ready access to these parts is afforded all the way across the machine, which customarily is many feet in width.

Further objects and advantages of the invention will be in part obvious and in part specifically referred to in the description hereinafter contained which, taken in conjunction with the accompanying drawings, discloses a preferred form of single facing machine constructed to operate in accordance with the invention; it should be understood, however, that changes may be made therein without departing from the invention in its broader aspects.

In the drawings:

Fig. 1 is a simplified sectional view taken longitudinally of the machine near one of its side frames, and showing primarily the pressure roll supporting and adjusting mechanisms.

Fig. 2 is a schematic view illustrating the movement of the pressure roll during adjustment, with respect to the adjacent corrugating roll.

Fig; 3 is a view similar to Fig. 1 but showing the parts of the machine in more full and complete form.

Fig. 4 is a view looking from the right hand side of Fig. 3, but showing primarily a bracket-like member associated with the pressure roll adjusting mechanism.

Fig. 5 is a vertical sectional view taken transversely of the machine at one end of the pressure roll.

Fig. 6 is a side elevation with certain parts cut away of a modified form of single facing machine embodying the invention.

Fig. 7 is a view similar to the right hand portion of Fig. 6, but showing the pressure roll assembly in withdrawn position with respect to the second corrugating roll.

Figs. 8 and 9 are detail sections taken respectively on the lines 88 and 99 of Fig. 6.

Referring first more particularly to Fig. l, the invention is there disclosed in simplified form as applied to a single facing machine wherein a paper Web 1 to be corrugated passes between a first corrugating roll 2 and a' second corrugating roll 3 to form the corrugations in the web, after which the corrugated web passes partially around roll 3 with its corrugations held in the flutes of the roll, adhesive being applied in appropriate manner to the exposed peaks of the corrugated web as indicated schematically at 4, and finally a facing paper sheet 5 is progressively pressed into engagement with the gurnmed peaks of the corrugated paper web by a pressure roll 6, to form single faced corrugated paper. The present invention is not particularly concerned with the specific construction and mode of operation of the

above parts

2, 3 and 4 of the machine, and since appropriate forms thereof are known in the art, they are not described in detail herein.

As shown in simplified form in Fig. l, the pressure roll 6 is mounted beneath and with its axis somewhat laterally offset from alignment with the axes of the

corrugating rolls

2 and 3, and substantially all of the weight of the pressure roll 6 is carried by supporting members 8, which provide bearings for the pressure roll 6 at its opposite ends, and are so mounted that the sheet pressing portion 9 of the periphery of the pressure roll may be adjusted in a substantially horizontal path toward and from the adjacent portion of the periphery of the second corrugating roll 3. In the illustrated form of the invention, the pressure roll supporting and position adjusting mechanism comprises similar units located at the opposite end portions of the roll, and therefore a description of one will serve for both.

In the illustrated formv of the invention, each of the pressure roll supporting members 8 swings about an axis 10 which is located substantially directly beneath the axis of the pressure roll 6, and therefore as indicated schematically in Fig. 2, when the pressure roll supporting members 8 are moved slightly about their axis 10, the position of the sheet pressing portion 9 of the pressure roll shifts with respect to the adjacent portion of the periphery of the corrugating roll 2 and the corrugations of paper web 1 which are carried thereby, along a path as indicated in Fig. 2 by the double ended arrow 11, which path, for practical purposes, ishorizontal, i. e. the arcuate deviation in movement of the sheet pressing portion 9 from the horizontal, is so slight as to be negligible. In this way, the adjustment ofthe pressure roll 8 toward and from the second corrugating roll 3, as needed to conform to paper webs of different thicknesses passing through the machine, may be made without imposing the weight of the pressure roll to any substantial extent upon the adjusting mechanism employed for that purpose. Therefore nothing is needed in the adjusting mechanism comparable to the reduction gearing heretofore employed since the adjustment acts freely and easily in both directions. Also it will be noted that during adjustment, the resulting alteration in spacing between the

rolls

3 and 6 is substantially less than the amount of movement of the said pressing portion 9 of pressure roll 6 during adjustment; this promotes attainment of the extreme precision in the positioning of roll 6 which is needed.

In the illustrated embodiment of the invention, the position adjusting mechanism for pressure roll 6 takes the form of substantially horizontal bars 12 (Fig. l), which are respectively connected to the supporting members 8 at the opposite sides of the machine, substantially at the level of the axis of pressure roll 6, and which pass through adjacent portions 13 of the side frames of the machine. Stop members 14, adjustable along the bars 12, are provided to limit the movement of pressure roll 6 toward the second. corrugating roll 3, and in the illustrated embodiment these stop members take the form of nuts which are threaded onto the bars 12 and provided respectively with lock nuts 15 to hold them in position.

A relief spring 16 is shown in- Fig. 1 as encircling the bar 12 and bearing against the roll supporting member 8 to urge the latter and therefore the pressure roll 6, toward the second corrugating roll 3. Under normal operating conditions, the two springs 16 hold the stop members 14 tightly against the adjacent portions 13 of the side frame of the machine, but should an abnormal thickness of material pass around with the second corrugating roll 3, the springs 16 will yield to allow the pressure roll 6 to move temporarily away from the second corrugating roll 3 and thereby permit the extra thickness of material to pass between the rolls without overstraining the latter. The pressure of spring 16 may be adjusted by a threaded collar 17 (Fig. 1), which engages in the side frame portion 13. The relief action of the springs 16 will be much easier and quicker than heretofore, since the force to be relieved acts directly on the springs without first being transmitted through reduction gearing, and without being substantially affected by the weight. of the pressure roll.

In Figs. 3 to 5, the invention is shown in more complete physical embodiment. Figs. 3 and 5 show one end extension of the pressure roll shaft 6a as having abearing in one of the pressure roll supporting members 8 above referred to, the lower portion of this supporting member being provided with forked extensions 8a (Fig. 5) which embrace a portion 13a of the corresponding side frame of the machine, andthe shaft 10 is journaled in this portion. of the side frame to constitute the. axis about which the supporting member 8 swings during adjustment of the pressure roll 6. One of the forks 8a of the supporting member 8 (see lower right hand portion of Fig. 5) is shown as having bolted thereto a pair of downwardly extending arms 8b, between the lower ends of which a roller is journaled about a spindle 8d. As shown in Fig. 3, astop stud 8e, adjustable by loosening a nut 8 may be provided to engage with one of the downwardly extending arms 812, when the pressure roll 6 has been set in accurately adjusted position by adjustment of the limit stop 14 previously referred to. This stop member 8e acts in conjunction with the stop 14 to prevent the pressure of the springs 16 from moving the pressure roll too close to the second corrugating roll. Heretofore, the pressure on the pressure roll which urges it toward the corrugating roll 3, has tended to force it into a position where the portions of the facing sheet 5 which lie between the peaks of the flutes on the second corrugating roll 3, were. forced slightly inside of the surface of the cylinder-defined by the peaks of the corrugated web carried around by corrugating roll 3, resulting in a hammering action ofv the peaks of the flutes on the,

B corrugating roll 3 as they traveled past the sheet pressin portion 9 of the pressure roll. The above mentioned stop members prevent such a hammering action.

While the machine is in normal action, the rollers 80 are idle, but when it is desired to spread the

rolls

3 and 6 apart temporarily, a cam shaft 8g (Fig. 3) running across the machine, may be turned to bring eccentric cams Sh into contact with the rollers 80 and thereby rock the supporting members 8 against the pressure of springs 16, to move the pressure roller 6 into a position relatively widely spaced from the second corrugating roller 3. When the cams 8h are moved back to the position shown in Fig. 3, the pressure roller 6 will be moved by springs 16 back to its normal spacing from the second corrugating roll 3 as determined by the setting of the stop members 14, the stop members 8e being adjusted to conform to this setting as above described.

Fig. 3 also shows one of the above mentioned springs 16 enclosing its corresponding horizontal bar 12 and bearing against a collar 18 which loosely surrounds the 1 bar 12 and is provided with a thrust bearing member 19 which engages the threaded collar 17 previously mentioned. The side frame portion 13 of the Fig. 1, through which the bar 12 passes, is shown in Figs. 3 and 4 as constituted by a bracket-like member which may be understood as having forked extensions 13b (Fig. 4), which are appropriately fastened to a part of the web 13a of one of the main side frames. The detailed structure of the side frames, however, is not important to the present subject matter. The bar 12 may be engaged loosely enough in collar 17 and frame portion 13, to allow for the slight rocking movements of arm 12 which will accompany its endwise, substantially horizontal movements.

At the right hand portion of Fig. 5, the end 6b of the shaft of pressure roll 6 is shown as provided with a driving sprocket 20. The surface speed of pressure roll 6 or the facing sheet carried thereby, should be accurately conformed to the surface speed of the gummed peaks of the paper corrugations which are being carried around by roll 3. For this purpose the sprocket 20 may be assumed to be driven from an appropriate motor through a variable speed transmission (not shown). The sprocket 20 may be understood as mounted loosely on the shaft extension 6b, and as driving a friction band 21 (Fig. 5) by means of a lug 22 on the band which engages with a flange 23 on the adjacent side of sprocket 20. A friction lining 24 is interposed between band 21 and a friction drum 25, fixed to the shaft extension 6b. Since friction drives of the above type are known in the art, the same will not be described in further detail.

Referring now to Figs. 6 to 9, I have there shown a single facing machine having a first corrugating roll 26 and a second corrugating roll 27, both of which may be assumed to be of usual or any appropriate form, and which are mounted in main frames 28 at the opposite sides of the machine. An appropriate mechanism is also indicated schematically in Fig. 6 for applying adhesive to the peaks of the corrugated web as they pass partially around with the second corrugating roll. This portion of the machine may also be assumed to be of usual form, having an adhesive containing pot 29, adhesive applying roll 30 and an auxiliary scraper roll 31.

The machine should also be understood as having a series of arcuate guide members 32, spaced transversely apart a few inches along the second corrugating roll 27 and having their lower end portions extending under the roll 27 to points adjacent the periphery of the pressure roll 33, as shown in Fig. 6. An previously mentioned, in the operation of the machine the portions of the guide members 32 which extend between the adhesive applying roll 30 and the pressure roll 33, have to be frequently cleaned to remove accumulated adhesive therefrom.

In the form of the invention under discussion, the pressure roll assembly is mounted upon a carriage, and this carriage is in turn mounted upon guides which af- 6 ford wide range movement of the pressure roll away from the second corrugating roll, i. e. movement of the pressure roll assembly toward the delivery end of the machine to the position shown in Fig. 7. This movement, which may be of the order of one and a half to two feet, provides an aisle as indicated at A in Fig. 7, extends transversely all the way across the machine between the

rolls

27 and 33, which aisle the operator may enter and move along to obtain ready access to the parts underneath the second corrugating roll 27 for cleaning purposes. Insofar as I am aware, in all single facing machines as heretofore constructed and used for many years, access to the parts underneath the second corrugating roll has been obtained for cleaning purposes (with much awkwardness and difiiculty), from the entrance or forward side of the roll 27, i. e. from the left as the parts appear in Figs. 6 and 7. The pressure roll and associated parts have prevented access from the delivery side of the second corrugating roll.

The pressure roll supporting carriage is shown in Figs. 6 to 8 as having side pieces 34 carrying wheels 35 mounted on axles 36, the wheels running on longitudinal tracks 37 at the opposite sides of the machine, which are secured respectively to the main side frames 28. Spring bumpers 38 (Figs. 6 and 7) may be provided to limit the withdrawing movement of the carriage.

The side pieces 34 are shown as having auxiliary side members 39 mounted thereon at the opposite sides of the machine, and which are connected by cross pieces 40. Auxiliary side frames 41 are mounted respectively on the side members 39 at the opposite sides of the machine to carry the pressure roll 33 and associated parts as hereinafter described.

A releasable lock mechanism is preferably provided to hold the above described carriage in predetermined position longitudinally of the machine, with respect to the main frame 28 and parts carried thereby, when the pressure roll 33 is in its operating position shown in Fig. 6. Inthe form shown, the main frames 28 carry a cross spindle 42 provided with flattened portions 43 (Fig. 9) at its opposite ends, a crank 44 being located on the side of the machine at which the operator usually stands, to turn the spindle 42 as required. The auxiliary side frames 41 are shown as provided with positioning plates 45 which may be carefully adjusted as to longitudinal position by means of stop screws 46 and bolts 47 (Fig. 9). The left hand ends of the plates 45, as the parts appear in Figs. 6 and 7, are provided with circularly shaped recesses 48 (Fig. 7), having throats 49 leading to the left hand ends of the plates 45. With the crank 44 and the flattened portion 43 of spindle 42 in the position shown in Fig. 7, the above described carriage and the pressure roll assembly may be moved to the left from the position shown in Fig. 7 until the flattened portions 43 of the spindle 42 enter the recesses 48. Then when the crank 44 is turned to the position shown in Fig. 6, the cylindrically curved surfaces of the fiattened portions 43 will fit snugly against the walls of recesses 48 to insure that the carriage is locked precisely in predetermined longitudinal position with respect to the main frames 28. This insures that the pressure roll 33 will be accurately in operating position with respect to the second corrugating roll 27. e

In Figs. 6 to 8 the pressure roll 33 is shown as supported by bearing members 50 at the opposite sides of the machine, which are supported by pins 51 carried respectively by the auxiliary side members41, which are located substantially directly beneath the pressure roll 33. Thus when the pressure roll assembly is in operative position with respect to the second corrugating roll 27, as shown in Fig. 6, the peripheral portion of pressure roll 33 adjacent the second corrugating roll, may be adjusted to conform to different thicknesses the angular position of bearing members 50, in substantially the same way as already described in connection with Figs. 1 to 5. To effect the above adjustment, I have shown in Figs. 6 and 7 a thrust rod 52, one of which should be understood as used at each side of the machine. The rod 52 passes loosely through a hole 53 in the auxiliary frame 41 and is pivotally connected at its upper end to a link 54 which latter is in turn pivotally connected to an arm 55 extending out from each bearing member 50. The stop member 56 shown in the form of a nut in Figs. 6 and 7, may be considered as equivalent to the stop member 14 above described in connection with Fig. l, and the lock nut 57 of Figs. 6 and 7 corresponds to the member 15 of Fig. 1. Likewise I have shown in Figs. 6 and 7 a hydraulic cylinder 58 which is of known construction, and which may be regarded as equivalent in function to the spring 16 of Fig. l, i. e. the fluid pressure in cylinder 58 normally pushes the pressure roll 33 as close to the second corrugating roll 27 as is permitted by the setting of the stop member 56, but the roll 33 is permitted to move temporarily somewhat away from roll 27 against the fluid pressure, in case material of abnormal thickness should be fed between the rolls.

In the above manner, precision spacing of the pressure roll 33 to conform to different thicknesses of paper passing through the machine, is secured by adjustment of the rod 52, the above mentioned locking mechanism being released and the carriage withdrawn to the position shown in Fig. 7, for cleaning purposes as needed; The carriage may be moved back and forth by hand or by an appropriate motor (not shown) as desired, the locking mechanism being relied upon to insure that the parts are accurately restored to working relation, after the cleaning operation is completed. A roll 59 may be mounted on the above described carriage to guide the facing sheet 60 in its travel to the pressure roll 33.

This application is a continuation in part of my earlier application, Ser. No. 360,722, filed June 10, 1953, and entitled Single Facing Machine, now abandoned.

While the invention has been disclosed as carried out by machines of the above described specific constructions, it should be understood that changes may be made therein without departing from the invention in its broader aspects, within the scope of the appended claims.

I claim:

1. A single facing machine of the character described, having mating corrugating rolls, a pressure roll positioned below the second corrugating roll and having an upper portion of its periphery in sheet pressing relation to a lower portion of the second corrugating roll, supporting members at the opposite ends of said pressure roll which bear substantially the entire weight of the pressure roll, said supporting members being constructed to afford movement of the sheet pressing portion of the pressure roll toward and from the adjacent portion of the second corrugating roll in a substantially horizontal path, and pressure roll adjusting mechanism acting substantially horizontally to position said pressure roll with its sheet pressing portion located selectively at various points along said path.

2. A single facing machine of the character described, having mating corrugating rolls, a pressure roll positioned below the second corrugating roll and having an upper portion of its periphery in sheet pressing relation to a lower portion of the second corrugating roll, supporting members at the opposite ends of said pressure roll which bear substantially the entire weight of the pressure roll, said supporting members being mounted to swing angularly about an axis located substantially directly beneath the pressure roll to afford movement of the sheet pressing portion of the pressure roll toward and from the adjacent portion of the second corrugating roll in a substantially horizontal path, and pressure roll adjusting mechanism connected to the upper portions of said pressure roll supporting members, said pressure roll adjusting mechanism acting substantially horizontally to position said pressure roll with its sheet pressing portion located selectively at various points along said path.

3. A single facing machine of the character described, having mating corrugating rolls, a pressure roll positioned below the second corrugating roll and having an upper portion of its periphery in sheet pressing relation to a lower portion of the second corrugating roll, supporting members at the opposite ends of said pressure roll which bear substantially the entire weight of the pressure roll, said supporting members being mounted to swing angularly about an axis located substantially directly beneath the pressure roll to afford movement of the sheet pressing portion of the pressure roll toward and from the adjacent portion of the second corrugating roll in a substantially horizontal path, and pressure roll adjusting mechanism connected to the upper portions of said pressure roll supporting members, said pressure roll adjusting mechanism including substantially horizontal bars connected respectively to the upper portions of said supporting members, and means affording endwise adjustment of each of said bars with respect to the frame of the machine to position the sheet pressing portion of the pressure roll selectively at various points along said path.

4. A single facing machine of the character described, having mating corrugating rolls, a pressure roll positioned below the second corrugating roll and having an upper portion of its periphery in sheet pressing relation to a lower portion of the second corrugating roll, supporting members at the opposite ends of said pressure roll which bear substantially the entire weight of the pressure roll, said supporting members being mounted to swing angularly about an axis located substantially directly beneath the pressure roll to afford movement of the sheet pressing portion of the pressure roll toward and from the adjacent portion of the second corrugating roll in a substantially horizontal path, and pressure roll adjusting mechanism connected to the upper portions of said pressure roll supporting members, said pressure roll adjusting mechanism including substantially horizontal bars connected respectively to the upper portions of said supporting members, and means affording endwise adjustment of each of said bars with respect to the frame of the machine to position the sheet pressing portion of the pressure roll selectively at various points along said path, said last mentioned means including pressure roll relief mechanism urging the sheet pressing portion of the roll yieldably into a sheet pressing position.

5. A single facing machine of the character described, having mating corrugating rolls, a pressure roll positioned below the second corrugating roll and having an upper portion of its periphery in sheet pressing relation to a lower portion of the second corrugating roll, supporting members at the opposite ends of said pressure roll which bear substantially the entire weight of the pressure roll, said supporting members being mounted to swing angularly about an axis located substantially directly beneath the ,pressure roll to afford movement of the sheet pressing portion of the pressure roll toward and from the adjacent portion of the second corrugating roll in a substantially horizontal path, and pressure roll adjusting mechanism connected to the upper portions of said pressure roll supporting members, said pressure roll adjusting mechanism including substantially horizontal bars connected respectivelyto the upper portions of said supporting members, each of said bars having pressure relief springs surrounding the bars and yieldably urging the said pressing portion of the pressure roll toward said pressing position, and each of said bars having a stop member adjustable therealong, and engageable with the frame of the machineto limit the movement of the said pressing portion of the ,pressure roll toward the second corrugating roll.

6. A single facing machine-of the character described, havingmatingcorrugating rolls,,a pressure roll positioned below the second corrugating roll and having an upper portion of its periphery in sheet pressing relation to a lower portion of the second corrugating roll, supporting members at the opposite ends of said pressure roll which bear substantially the entire weight of the pressure roll, said supporting members being constructed to afford movement of the sheet pressing portion of the pressure roll toward and from the adjacent portion of the second corrugating roll in a substantially horizontal path, and pressure roll adjusting mechanism acting substantially horizontally to position said pressure roll with its sheet pressing portion located selectively at various points along said path, said pressure roll adjusting mechanism including means yieldably urging the sheet pressing portion of the pressure roll toward said pressing position, and adjustable stop means limiting the movement of the said pressing portion of the pressure roll toward the second corrugating roll.

7. A single facing machine of the character described, having mating corrugating rolls, a pressure roll positioned below the second corrugating roll and having an upper portion of its periphery normally positioned in sheet pressing relation to a lower portion of the second corrugating roll, said machine having a series of guide members spaced transversely across the machine and extending into the space which is under the second corrugating roll and located forwardly of the pressure roll, a carriage supporting said pressure roll, said machine having means guiding said carriage to afford wide range movement of said pressure roll away from the second corrugating roll, thereby to provide an aisle extending transversely of the machine between said last mentioned rolls, from which aisle said guide members are rendered accessible.

8. A single facing machine of the character described, having mating corrugating rolls, a pressure roll positioned below the second corrugating roll and having an upper portion of its periphery normally positioned in sheet pressing relation to a lower portion of the second corrugating roll, said machine having a series of guide members spaced transversely across the machine and extending into the space which is under the second corrugating roll and located forwardly of the pressure roll, a carriage supporting said pressure roll, said machine having means guiding said carriage to aiford wide range movement of said pressure roll away from the second corrugating roll, thereby to provide an aisle extending transversely of the machine between said last mentioned rolls, from which aisle said guide members are rendered accessible, means releasably locking the carriage in normal operating position with respect to the second corrugating roll, and means mounted on the carriage to afford fine adjustment of the pressure roll toward and from the second corrugating roll.

No references cited.