US3152941A

US3152941A - Multi-ply web forming apparatus with edge aligning means

Info

Publication number: US3152941A
Application number: US75861A
Authority: US
Inventors: Robert A Sherman; Lawrence H Roberts
Original assignee: Corrugating Technicians Inc
Current assignee: Corrugating Technicians Inc
Priority date: 1960-12-14
Filing date: 1960-12-14
Publication date: 1964-10-13
Anticipated expiration: 1981-10-13
Also published as: BE611418A

Description

MULTI-PLY WEB FORMING APPARATUS WITH EDGE ALIGNING MEANS Filed Dec. 14. 1960 Oct. 13, 1964 R. A. SHERMAN ETAL 4 Sheets-Sheet l INVENTORS Robert A. Sherman Lawrence H.

Roberrs Oct. 13, 1964 3,152,941

MULTIPLY WEB FORMING APPARATUS WITH EDGE ALIGNING MEANS Filed Dec. 14, 1960 R. A. SHERMAN ETA].

4 Sheets-Sheet 2 INVENTORS Roberi A. Sherman Lawrence H. Roberrs i/M ATTORNEY Oct. 13, 1964 R. A. SHERMAN ETAL 3,152,941

MULTI-PLY WEB FORMING APPARATUS WITH EDGE ALIGNING MEANS Filed Dec. 14, 1960 4 Sheets-Sheet 3 INVENTORS Roberr A.Sherman Lawrence H. Roberrs M ZTTQRNEY Oct. 13,1964 R. A. SHERMAN ETAL 3,152,941

MULTI-PLY was FORMING APPARATUS WITH EDGE ALIGNING MEANS Filed Dec. 14, 1960 4 Sheets-Sheet 4 FIG. 1C

INVENTORS Roberf A.Sherman Lawrence H. Roberfs WM ATTORNEY tion of United States Patent 3,152,941 MULTI-PLY WEB FORMING APPARATUS WITH EDGE ALIGNING BEANS Robert A. Sherman, Lancaster, Pa, and Lawrence H.

Roberts, Clifton, N.J., assignors, by mesne assignments, I

to Corrugating Technicians, Inc., Tenafly, N.J., a corporation of New Jersey Filed Dec. 14, 1960, Ser. No. 75,861 9 Claims. (Cl. 156351) sheet, known as the medium, is fed from a supply roll between two heated metal rolls having fluted surfaces which corrugate the medium. While the medium is maintained in contact with one of the corrugating rolls, it is glued to a second flat sheet called the first liner.

The gluing is performed under high heat and great pressure by means of a smooth surface roll pressing the first liner against the corrugated medium engaged with the one corrugating roll. The product at this stage is known as a sheet of single face corrugated paperboard.

In the next step of the operation, a sheet of paper called the second liner is glued to the opposite face of the medium. This is effected by applying glue to a surface of the single face and then passing the combined single face and second liner over one or more highly heated metal plates against which the two liners and the medium are pressed by a series of metal rolls. The durathe pressure heat application is varied in accordance with the weight (thickness) of the paper sheets and is regulated by varying the rate of movement of the sheets over the hot plates. a

The corrugated board'is purposely made oversize in width to allow subsequent edge trimming to provide smooth even edges, as the board emerging. from the machine, and before trimming, does not have such smooth 7 even edges. The trimmed board may then be slit to nar-' rower widths, if desired, and cut into desired lengths.

If at least one edge of each sheet could be kept in perfect alignment with the corresponding edges of the other sheets during the gluing operations, the resulting corrugatedpaperboard emerging fromthe final gluing and heating operationwould haveat least one smooth even edge. Thus, only one edge, at the most, would have to be trimmed. This would not only cut down the percentage -of scrap but would also substantially reduce the slight crushing of the board attendant upon the trimming steps. This tendency of the cutting or trimming opera-. [tions to break down the corrugations gives the board a weakened appearance.

Another reason why such continuous monitoring of the sheet edges is important is that various papers have different amounts of shrinkage when-subjected to high temperatures and pressures. It is not possible to determine this shrinkage in advance, so that, even with papers havingexactly the same width initially, misalignment of edgesv may occur; due to variable shrinkage-when the "paper-is subjected to the high temperatures" and pressures,- such as the 280 to 350 F. used in the gluing step, a

during combining of the sheets into corrugated bo ard. In U.SL Patent No; 2,941,572,'issued June 21,1960,

there is shown and described ed'ge aligning means'including edge sensing means operating through a mech'ani: cal linkage type of serve and follow-up mechanism to maintain the corresponding edges of, the sheets in accurate alignment with each other. While this apparatus operates satisfactorily in practice, it has been found that 3,152,941 Patented Oct. 13, 1964 there is some undesirable play in the mechanical linkage, for which is difiicult to fully correct or to compensate. Also, adjustment of the trimming means, to compensate for any errors in initial setting, is diflicult during operation of the apparatus.

The present invention is directed to improvements in the general type of edge aligning mechanism shown and described in the mentioned Densen et al. patent. More particularly, a novel type of hydraulically operated servo and followup mechanism is used, including roller supporting bridges which may be shifted bodily laterally of the paper webs to effect edge alignment.

The servo and follow up mechanism is under the control of vacuum operated pilot valves which shift position with changes in the degree of vacuum. The degree of vacuum on each valve is controlled by a movable edge sensing element in contact with a sheet edge. In addition, certain of theservo mechanism are hydraulically interlocked for conjoint operation on longitudinally spaced portions of the web. I

A novel feature is the web slitting arrangement which is mounted on a bridge which is bodily shiftable laterally of the completed web. Thereby, after the knives have been adjusted spatially for the desired slit widths, the entire slitter may be shifted to properly and conjointly adjust all the knives relative to the edge of the web. In

addition the slitter includes three or more knife supports selectively movable into operative relation with the web. The then inoperative sets of knives can be adjusted as to slit width before being moved to the web slitting position. For an understanding of the invention principles, reference is made to the following description of a typical embodiment thereof as illustrated in the accompanying drawing.

In the drawings:

FIG. 1 is a somewhat schematic perspective view of apparatus embodying the invention;

FIG. 2 is a partial enlarged perspective view of one of the edge sensing mechanisms; and

FIGS. 1A, 1B and 1C are enlarged schematic per-spective views of the apparatus embodying the invention as shown in FIG. 1, representing the left, middle and right portions respectively of the schematic perspective view shown in FIG. 1.

In the drawing, electrical connections are illustrated by broken, or dash lines, vacuum lines by dot and dash lines, and hydraulic lines by solid Referring t9 the drawing a firstjweb 10, known as the medium and designed to' bie corrugated, is drawn path as set by the micro-switches.

Web 10 passes over idler roll 14A and under idler roll 14B which maintains web 10 firmly engagedwith a steering roll 15. Steering rolls 14B and 15 are shiftablelaterally, by means described hereinafter, with roll 15 further being pivotal about a vertical axle 16 to which it is connected by a radius arm 17. Leaving steering roll 15, web 10 passes under-and over, respectively, idler rolls 18A .-and,18B.an d then between corrugating rolls 25, ZS which are longitudinally tinted to impart corrugations to theme dium 10. Rolls. 25,- 25 heat .Web 10 to fiom 280-F. to' 350 F. while, at the same time, imparting a high pressure thereto. Thisrelatively high heating and pressure fixes or sets the corrugations in medium 10. Beyond

corrugating rolls

25, 25, a glue roller 26 applies glue to the corrugations of medium 10. .7 i i V At the same time, a second paper web 20, known as the first liner, is drawn from a roll 21 adjustable laterally or axially by means powered by reversible electric motor 22 controlled by adjustably positionable microswitches 23 operatively associated with the edges of first liner 20 to maintain this web aligned along a predetermined path as it is drawn from roll 21. Web 20 passes over idler roll 24A, under idler roll 24B, and then around pressure roll 27 which presses first liner 20 against the I make either a single faceweb or a double face web. To

make a double face web, the single face web 35 is drawn over idler rolls 28A and 28B, and then around idler rolls 41 of a single face bridge guide 4t? which is bodily shiftable laterally of the web. Bridge 40 may be provided with a second set of wrap-around idler rolls 42, useable alternatively with respect to wrap-around idler rolls 41. From bridge 40, the single face web 35 passes under an idler roll 43- engaging the first liner 20 surface of the single face Web. The single face liner then passes between a glue roll 44, fed by a roll 46, and a pressure roll 47. Roll 44 applies glue to the flutes of the corrugated medium 10.

At the same time,.a paper web 30, known as the second liner, is drawn from a roll 31 which is bodily shiftable laterally of the web by mechanism driven by a reversible electric motor 32 controlled by microswitches 33 operatively associated with the edges of second liner 30. Second liner 30 is then drawn under idler rollers 34 and 36A, and over idler roller 363 which presses it against the glue coated flutes of medium forming part of single face web 35. The three

webs

10, 20 and 30 are then drawn between plates 58 and pressure rolls 59, which press web 30 into firmly adher'ingrelation with medium 10 to form the double face web 45. g

' As stated, if the corresponding edges of the three webs are not accurately aligned, material must be trimmed from both edges of double face web 45 to form smooth even edges on the corrugated board. This not only wastes material but may also result in slight crushing and weakciated regulator R which is a pilot'valve whose position is controlled by the effective vacuum thereon. The vacuum is effected by an exhausting device 57. A motordriven pump 58 supplies hydraulic fluid from a reservoir 59 to each valve R, and each valve R is connected by a pair of hydraulic lines H to the associated fluid pressure actuator or actuators F. Depending upon the position of valve R, as determined by the effective vacuum thereon, the valve will allow hydraulic fluid under pressure to flow from pump 58 through one line and return to reservoir 59 through the other line. 1

Edge feeler 51-1 of sensing device S-1 contacts the control edge of web or first liner 20 just downstream of roll 24B. Any lateral movement of web 20 will vary the opening of the vacuum aperture in element'50-1, and shift valve R-l accordingly. A hydraulic line H-ll connects valve R-ll to the inner end of fluid pressure actuator F-l, and a hydraulic line H-IZ connects valve R-l to the outer end of actuator F-Z. The outer end of actuator F-l is connected to theinner end of actuator F-Z by a hydraulic line H-13 which is always filled solidly with hydraulic fluid. f

Thus, depending upon the direction of lateral shifting of web 20, hydraulic fluid is applied either to actuator F-l or actuator F-Z. If actuator F-l isshifted, actuator F-2 is correspondingly shifted through the medium of line H-l3, and vice versa. Sensing device S2 moves with actuator F-2. Consequently, anyshifting of web 20 results in corresponding shifting of element 502 and edge feeler 51-2 of sensing device S-2. This results in shifting of valve R-Z due to variation in its effective vacuum.

. Hydraulic lines H-21 and H-22 connect valve R-Z to opposite ends of actuator FA, so that actuator FA is of web 20. The movement; continues until valve R-1 is ening of the medium 10 as illustrated in FIG. 4'of the Densen et al. patent. The weakened appearance of the crushed board materially detracts from its sales appeal.

To maintain corresponding edges of the three webs, hereinafter. referred to as the control or near edges of the three webs, in accurate alignment, the apparatus in-.

Y illustrated as controlling the relative aperture of the vacuum line 44. In the present arrangement, anelement operated by the finger 51 controls the relative sizejof such aperture. Also, each regulator R may be substantially the same asthe'regulator R shown in FIG. 5 of said Densen et al. patent except that the diaphragm 45 controls a valve which varies the relative amount of fluid flowing through a pair of fluid lines. 1 In other words, each regulator R comprises a diaphragm operated pilot valve, such as are well known to those skilled in the As best seen in FIG. 2,'-element.5tl is mounted, by means of an arm schematically indicated at 52, on a block 53 which is adjustable along a calibrated shaft 55 by'means of a threaded shaft 54 operated 'bya control handle 56.

A vacuum line V connects each element F to the. assorestored to its neutral position, which occurs when the control edge of web 20 is restored to its preet position.

To effect exact alignment of the control edges of webs 1i) and 20, elements 504 and -2 are adjusted to the same position or reading on their respective calibrated shafts before the apparatus is started. It will be noted that sensing device 3-2 is operative on single face web 35 in advance of idler roll 28A.

Single face web 35 and web 30 have their control edges maintained exactly aligned in the same manner as described; Sensing device S3 is associated with web 35 just beyond bridge 40, and sensing device 8-4 is associated with web 30 just beyond idler roll 34. However, in this case, in place of a moving steering roller 15, actuator FB shifts bridge 40 laterally.

. A feature of the invention is the slitter having the slitter knives adjustable as to number and lateral spacing. Between sensing devices S3,S-4 andthe slitter 60, the double face web 45 can weave or shift laterally even though allthree control edges of the

webs

10, 20, 30 are exactly aligned. .Thus, the cutting or slitting rollers must be correspondingly shifted so as to main their exact positions relative to the control edges. V

' The slitter 60 comprises a pair of essentially triangu- Theseplates support three calibrated graduated-shafts extending across the web, one shaft being at each corner of the triangles. The knives 65 are adjustable axially of these shafts, by having hubs provided with set screws. Only one shaft is in operative relation with the web at any time, so that the knives may be set and adjusted on the other shafts for a change in cutting or slitting pattern. The. slitter is mounted on rollers 63, for bodily lateralshifting by'actuator FC.

An edge sensing device S-S engages web 45 between the pressure means 58, 59 and slitter 60'. Any shifting of edge feeler 51-5, due to shifting of web 45, results in aoperation ofvalve R-S connected by lines -H-51 .and H-SZto actuator FC. "The latter is thus operated to lateral shift of web 45. It should be noted that the far knife 65 is an edge trimmer for the far or uncontrolled edge of the board. A rotary knife may be provided at the control edge to function in the event of failure of sensing mechanism S-5. v

The hydraulic actuating system with the vacuum controls is much more readily adaptable to any corrugated board making machine than is a mechanical type of edge aligning mechanism. "As one example, it is much less simple and expensive to run the hydraulic lines than to position and accurately set mechanical linkage. Furthermore, the play, which can never be completely eliminated from relatively movable mechanical parts, is not present in hydraulic servo and fol-low up mechanism. Thus, the control is much more sensitive and accurate.

Microswitches

13, 23 and 33 are provided to assure

rolls

11, 21 and 31 being positioned within the control range of the edge aligning mechanism. These switches are set'vvith a positional relation to the size of the rolls. If a new roll is fed into the machine in a position outside such control range, the microswitches operate motors 12,

22 or 24 to adjust the roll to aposition within the control range.

While a specific embodiment of the invention has been shown and described in detail to illustrate the application of the invention principles, it will be understood that the invention may be embodied otherwise without departing from such principles.

What is claimed is:

1. In apparatus for uniting paper webs in superposed relation to form multi-ply paper strip, and of the type including means for progressively withdrawing a first liner web from a supply, means for progressively withdrawing a medium web from a supply, means for progressively applying adhesive to a surface of the mediumweb, and means for progressively pressing the liner web against the adhesive coated surface of the medium web to form a two-ply strip: the improvement comprising edge aligning means including a first support extending laterally of said first liner web; a first edge detector engaged with a control edge of the first liner web and mounted on said first support for adjustment laterally of said first liner web; said first edge detector being movable from a neutral position responsive to lateral shifting of said first liner web from a predetermined path; a first hydraulic fluid actuator operable to shift said first support laterally of said first liner web; a second support extending laterally of said strip; a second edge detector engaged with a control edge of said strip corresponding to the control edge of said first liner web and mounted on said second support for adjustment laterally of said strip; said second edge detector being movable from a neutral position responsive to lateral shifting of said strip from a predetermined path; a second hydraulic fluid actuator operable to shift said second support laterally of said strip; a source of hydraulic fluid under pressure; a first regulator connected to said first edge detector and between said source of hydraulic fluid and one end of said first actuator and the opposite end of said second actuator,

'and selectively operable to supply fluid "to one of said actuators, upon movement of said first edge detector from its neutral position, to shift the associated support in a direction opposite to the direction of shift of said first liner web; a continuous hydraulic fluid filled line, uninterrupted by valves or branches, connecting the opposite'end of said first actuator to the one end of said second actuator, said line being continuously solidly filled with hydraulic fluid whereby, upon operation of either actuator, the other actuator is operated correspondingly as to direction'and degree; lateral guiding means engaging the medium web in advance of the adhesive applying means; a third hydraulic fluid actuator connected to said guiding means to actuate the latter to shift the medium Web laterally; and a second regulator connected to said second edge detector and between said source and said third actuator and operable, upon movement of said second detector from its neutral position due to shifting of said second support, to supply fluid to said third actuator in a direction to operate the latter to actuate said guiding means to shift the medium web laterally in direction and degree corresponding to the shift of the first liner web.

2. Edge aligning means asclaimed in claim 1 in which each support includes a graduated shaft extending laterally of the web; each detector being supported on a mount movable along the associated graduated shaft; whereby the lateral positions of the detectors may be coordinated in advance of starting the forming operation.

3. Edge aligning means as claimed inclaim 1 in which the supplies are rolls of paper; laterally adjustable mounts for each roll; reversible electric motor means for laterally shifting each mount; and adjustably positioned switch means controlling operation of the associated motor means and operable by a roll, when the latter is positioned in amount laterally beyond the control range of the edge aligning means, to energize the associated motor means to shift its controlled mount laterally to position the roll within such control range.

4. Edge aligning means as claimed in claim 1 in which said guiding means is a steering roller;

5. Edge aligning means as claimed in claim 1 in which said apparatus includes means for progressively withdrawing a second liner web from a supply, means for progressively applying adhesive to the exposed surface of the medium web of said strip, and means for progressively pressing the second liner web against the adhesive coated exposed surface of the medium web to form a three-ply strip: a laterally shifitable bridge; roller means on said bridge engaged by said two-ply strip; a third support extending laterally of said strip beyond said bridge; a third edge detector engaged with said control edge of the strip and mounted on said third support for adjustment laterally of said strip; said third detector being movable from a neutral position responsive tolateral shifting of said strip; a'fourth hydraulic fluid actuator operable to shift said third support laterally of said strip; a fourth support extending laterally of said second liner web in advance of said last named pressing means; a fourth edge detector engaged with a control edge of said second liner web corresponding to said first-named control edges; and mounted on said fourth support for adjustment laterally of the second liner web; said fourth detector being movable from a neutral position responsive to lateral shifting of said second liner web; a fifth hydraulic fluid actuator operable to shift said fourth support laterally of said second liner web; a third regulator connected to said fourth edge detector and between said source and one end of said fourth actuator and the opposite end of said fifth actuator; and selectively operable to supply fluid to one of said fourth and fifth actuators, upon movement of said fourth edge detector from its neutral position, to shift the associated support in a direction opposite to the direction of shift of said second liner web; a continuous hydraulic fluid filled line, uninterrupted by valves or branches, connecting the opposite end of said fourth actuator to the one endtofsaid fifth actuator, said line being continuously solidly filled with hydraulic fluid whereby upon operation of either actuator, the other actuator'is operated correspondingly as to direction and degree;a sixth hydraulic fluid actuator connected to said bridge to actuate the latter .to shift said twoply strip laterally; and a fourth regulator connected to said third edge detector and between said source and said sixth actuator and operable, upon movement of said third detector from its neutral position due to shifting of said third support, to supply fluid to said sixth actuator in a direction to operate the latter to actuate bridge to shift the,

. 7 6. In apparatus for uniting paper webs in superposed relation toform multi-ply paper strip, of the type including means for maintaining corresponding control edges of the WBbSlIl lateral alignment during formation of the v multi-ply paper strip; means for laterally sub-dividing the strip and trimming the uncontrolled edge thereof comprising, in combination, a knife support extending across the strip; knives adjustable longitudinally of said support, in accordance with pre-set slit widths of the strip, and including a knife for trimming the uncontrolled edge of the strip; a bridge extending transversely of the strip and mounting said knife support; an actuator effective to shift said bridge laterally of the strip; an edge detector support movable with said bridge; an edge detector adjustable along said detector support and operatively associated with the controlled edge of the strip in advance of said knife support, and movable from a neutral position upon lateral shifting of the strip; and servo-mechanism interconnecting said detector and said actuator and operable, upon shifting of said edge detector from a neutral position, to control said actuator to shift said bridge laterally in direction and degree corresponding to the lateral shifting of the strip.

7. Means as claimed in claim6 including a pair of plates rotatably mounted .on said bridge on either side of the strip; and plural knife supports extending between said plates and selectively positionable inoperative relation to the strip, one at a time, by rotation of said plates.

8. Means as claimed in claim 6 including a knife on said knife support engageable'with such controlled edge to trim the same upon failure of said edge detector or said servo-mechanism.

9. Means as claimed in claim 6 in which said actuator is a hydraulic fluid actuator.

Q References Cited in the file of this patent UNITED STATES PATENTS 2,412,576 Giles Dec. 17, 1946 2,914,957 Johnson Dec. 1, 1959 2,941,572 Densen et all June 21, 1960 UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3,152, 941 October 13, 1964 Robert A. Sherman et al It is hereby certified that error appears in the above numbered .patent requiring correction and that the said Letters Patent should read as corrected below Column 4,

lines

43 and 44, strike out "noted that sensing device S-Z is operative on single face web 35 in advance of idler roll 28A." and insert instead noted that sensing device 5-2 is operative on web 10 in advance of corrugating roll 25 (FIG. 1A) column 5,

lines

49, 50, 53, 54 and 57, for "strip", each occurrence, read medium web Signed and sealed this 6th day of July 1965.

(SEAL) Attest:

ERNEST W. SWIDER EDWARD J. BRENNER Aitesting Officer Commissioner of Patents

Claims

1. IN APPARATUS FOR UNITING PAPER WEBS IN SUPERPOSED RELATION TO FORM MULTI-PLY PAPER STRIP, AND OF THE TYPE INCLUDING MEANS FOR PORGRESSIVELY WITHDRAWING A FIRST LINER WEB FROM A SUPPLY, MEANS FOR PROGRESSIVELY WITHDRAWING A MEDIUM WEB FROM A SUPPLY, MEANS FOR PROGRESSIVELY APPLYING ADHESIVE TO A SURFACE OF THE MEDIUM WEB, AND MEANS FOR PROGRESSIVELY PRESSING THE LINER WEB AGAINST THE ADHESIVE COATED SURFACE OF THE MEDIUM WEB TO FORM A TWO-PLY STRIP; THE IMPROVEMENT COMPRISING EDGE ALIGNING MEANS INCLUDING A FIRST SUPPORT EXTENDING LATERALLY OF SAID FIRST LINER WEB; A FIRST EDGE DETECTOR ENGAGED WITH A CONTROL EDGE OF THE FIRST LINER WEB AND MOUNTED ON SAID FIRST SUPPORT FOR ADJUSTMENT LATERALLY OF SAID FIRST LINER WEB; SAID FIRST EDGE DETECTOR BEING MOVABLE FROM A NEUTRAL POSITION RESPONSIVE TO LATERAL SHAIFTING OF SAID FIRST LINER WEB FROM A PREDETERMINED PATH; A FIRST HYDRAULIC FLUID ACUTATOR OPERABLE TO SHIFT SAID FIRST SUPPORT LATERALLY OF SAID FIRST LINER WEB; A SECOND SUPPORT EXTENDING LATERALLY OF SAID STRIP; A SECOND EDGE DETECTOR ENGAGED WITH A CONTROL EDGE OF SAID STRIP CORRESPONDING TO THE CONTROL EDGE OF SAID FIRST LINER WEB AND MOUNTED ON SAID SECOND SUPPORT FOR ADJUSTMENT LATERALLY OF SAID STRIP; SAID SECOND EDGE DETECTOR BEING MOVALBE FROM A NEUTRAL POSITION RESPONSIVE TO LATERAL SHIFTING OF SAID STRIP FROM A PREDETERMINED PATH; A SECOND HYDRAULIC FLUID ACTUATOR OPERABLE TO SHIFT SAID SECOND SUPPORT LATERALLY OF SAID STRIP; A SOURCE OF HYDRAULIC FLUID UNDER PRESSURE; A FIRST REGULATOR CONNECTED TO SAID FIRST EDGE DETECTOR AND BETWEEN SAID SOURCE OF HYDRAULIC FLUID AND ONE END OF SAID FIRST ACTUATOR AND THE OPPOSITE END OF SAID SECOND ACTUATOR, AND SELECTIVELY OPERABLE TO SUPPLY FLUID TO ONE OF SAID ACTUATORS, UPON MOVEMENT OF SAID FIRST EDGE DETECTOR FROM ITS NEUTRAL POSITION, TO SHFIT THE ASSOCIATED SUPPORT IN A DIRECTION OPPOSITE TO THE DIRCTION OF SHIFT OF SAID FIRST LINER WEB; A CONTINUOUS HYDRAULIC FLUID FILLED LINE, UNINTERRUPTED BY VALVES OR BRANCHES, CONNECTING THE OPPOSITE END OF SAID FIRST ACTUATOR TO THE ONE END OF SAID SECOND CTUATOR, SAID LINE BEING CONTINUOUSLY SOLIDLY FILLED WITH HYDRAULIC FLUID WHEREBY, UPON OPERATION OF EITHER ACTUATOR, THE OTHER ACTUATOR IS OPERATED CORRESPONDINGLY AS TO DIRECTION AND DEGREE; LATERAL GUIDING MEANS ENGAGING THE MEDIUM WEB IN ADVANCE OF THE ADHESIVE APPLYING MEANS; A THIRD HYDRAULIC FLUID ACTUATOR CONNECTED TO SAID GUIDING MEANS TO ACTUATE THE LATTER TO SHFIT THE MEDIUM WEB LATERALLY; AND A SECOND REGULATOR CONNECTED TO SAID SECOND EDGE DETECTOR AND BETWEEN SAID SOURCE AND SAID THIRD ACTUATOR AND OPERABLE, UPON MOVEMENT OF SAID SECOND DETECTOR FROM ITS NEUTRAL POSITION DUE TO SHIFTING OF SAID SECONDSUPPORT, TO SUPPLY FLUID TO SAID THIRD ACTUATOR IN A DIRECTION TO OPERATE THE LATTER TO ACTUATE SAID GUIDING MEANS TO SHIFT THE MEDIUM WEB LATERALLY IN DIRECTION AND DEGREE CORRESPONDING TO THE SHIFT OF THE FIRST LINER WEB.