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Publication numberUS3401928 A
Publication typeGrant
Publication dateSep 17, 1968
Filing dateAug 19, 1966
Priority dateAug 19, 1966
Publication numberUS 3401928 A, US 3401928A, US-A-3401928, US3401928 A, US3401928A
InventorsFrick Richard H
Original AssigneeKimberly Clark Co
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Machine for producing a longitudinally folded stack of webs
US 3401928 A
Abstract  available in
Images(3)
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Claims  available in
Description  (OCR text may contain errors)

Sept. 17, 1968 R. H. FRICK Y 3,401,928

MACHINE FOR PRODUCING A LONGITUDINALLY FOLDED STACK OF WEBS Filed Aug. 19, 1966 s Sheecs-Sheet 1 Sept. 17, 1968 R. H. FRI-CK 3,401,928

MACHINE FOR PRODUCING A LONGITUDINALLY FOLDED STACK OF WEBS Filed Aug. 19, 1966 3 Sheets-Sheet 2 R. H. FRICK Sept. 17, 1968 MACHINE FOR PRODUCING A LONGITUDINALLY FOLDED STACK OF WEBS 3 Sheets-Sheet 5 mm R-r Filed Aug. 19, 1966 United States Patent 3,401,928 MACHINE FOR PRODUCING A LON GITUDINALLY FOLDED STACK 0F WEBS Richard H. Frick, Neenah, Wis., assignor to Kimberly- Clark Corporation, Neenah, Wis., a corporation of Delaware Filed Aug. 19, 1966, Ser. No. 573,585 Claims. (Cl. 270-40) ABSTRACT OF THE DISCLOSURE A machine for folding uniform width webs of sheet material into a stack with each Web being folded to have two quarter folds on the top surface and a half width fold on the bottom, the machine comprising a series of folding devices each of which overfolds the top quarter width fold and underfolds the bottom half width fold with respect to the intermediate quarter width fold and each folding device having first, second and third folding edges disposed in a single plane and joining at a single point, a fourth folding edge extending from said point at obtuse angles to said first and second folding edges so that the central zone of the web may be passed over the first folding edge while a lateral edge strip of the web passes successively over the fourth, second and third folding edges to be folded underneath the central zone of the web, each said folding device also including a fifth folding edge extending from a second point on said first folding edge spaced from said first point and extending obliquely with respect to said first folding edge and being disposed in the same plane as said fourth folding edge and a sixth folding edge substantially in said first named plane and extending from said second point to said second folding edge so that a lateral edge strip of the web may successively pass over said fifth and sixth folding edges to be folded over said central zone of the Web.

My invention relates to papermaking machines and paper products and more particularly to folded webs of paper or other sheet material and to machines for folding the webs.

Herbert H. Scholz and I have proposed in co-pending application, Ser. No. 567,440, filed July 25, 1966, a change or modification of the longitudinal web interfolding structures disclosed in Greiner et al. Patent 3,066,932, issued Dec. 4, 1962. In brief, this modification of the Greiner et al. structures essentially was the substitution of a modified type of folding device or board for one of the series of folding devices or boards disclosed in the Greiner et al. patent. The modified type of folding device was of such construction that it not only allowed the device to be used for interfolding a web passing over the device with a previously folded stack of webs, but the modified folding device also, on a re-threading, was capable of folding the web passing over the device back upon itself along the longitudinal center line of the previously interfolded stack of webs.

It is an object of the present invention to utilize a plurality of such modified folding devices or boards positioned in tandem and in a series so that the series of devices is not only capable of longitudinally interfolding a series of webs, similar to the interfolding action of the folding devices disclosed in the Greiner et al. patent, but is also capable of laying down a series of webs having the top halves folded back upon themselves along longitudinal center lines, without any interfolding between the webs, so as to form a Z-fold type of folded stack of webs.

The invention consists of the novel constructions, arrangements and devices to be hereinafter described and 3,401,928 Patented Sept. 17, 1968 claimed, for carrying out the above stated objects, and such other objects, as will be apparent from the following description of a preferred form of the invention, illustrated with reference to the accompanying drawings, wherein:

FIG. 1 is a partial plan view of a folding mechanism incorporating the principles of the invention and including a plurality of folding boards disposed in a series;

FIG. 2 is a view taken substantially on line 22 of FIG. 1 and showing an end perspective view of one of the folding boards of the invention;

FIG. 3 is a view similar to FIG. 2 but with the folding board being used in a different way;

FIG. 4 is a side elevational view of the folding board illustrated in FIGS. 2 and 3;

FIG. 5 is a view taken substantially on line 5-5 of FIG. 1 and showing an end perspective view of another folding board of the folding mechanism;

FIG. 6 is a view similar to FIG. 5 but with the folding board being used in a different manner;

FIG. 7 is a sectional view taben substantially on line 77 of FIG. 1 and showing a stack of paper Webs that have been folded utilizing the folding mechanism illustrated in the previous figures;

FIGS. 8 and 9 are views similar to that of FIG. 7 but with the folding boards being threaded differently to fold the webs differently;

FIG. 10 is a perspective view of a carton of C-folded tissues constituting prior art;

FIG. 11 is a perspective view of tissues as folded in FIG. 8 and disposed in a carton; and

FIG. 12 is a diagrammatic illustration of one of the folding boards setting forth various dimensions and angles of the board.

Like characters of reference designate like parts in the several views.

Referring to FIG. 1 in particular, the folding mechanism of the invention may be seen to utilize two types A and B of folding boards or devices... The two types of folding boards A and B are alternately arranged in a series, with each type B device following a type A device and being arranged betwen two type A devices except for the last type B device in the series.

As seen in FIG. 1, the particular folding device B follows the particular device A the device A which is identical to the first device A follows the device B and the device B which is identical to the device B follows the device A Likewise, in the series of folding devices B B B etc. (not shown), identical with device B will respectively follow devices A A A etc. (not shown), identical with device A Referring to FIG. 2 showing the device A each type A device comprises fiat sheet metal portions 10, 11 and 12 which are preferably made of a single piece of sheet material folded along lines 13 and 14. The portion 12 may be considered as a base portion preferably used ina horizontal position; and, as will be observed from FIG. 4, the portion 10 extends upwardly and at an obtuse angle with respect to the portion 12. The line 14, as will hereafter appear, extends parallel with the path X of movement of a web or webs passing over the folding board and parallel with the edges of the webs. The portion 12 terminates in an edge 15 which extends at an acute angle with respect to the line 14, the apex of the lines 14 and 15 being at a point 16; and the line 13, as well as the lower edge 17 of the portion 10, terminate at the point 16. The Greiner et al. Patent 3,066,932 may be referred to for the preferred relationship of the fiat portions 10, 11 and 12 and the lines defining the edges of these portions with respect to each other, in order that a web may pass over the device and be folded by it without wrinkling or stretching of portions of the web.

The flat portion 12 is preferably provided witha side extension 12a at one end of the board by means of which the portion 12 may be supported from a table 18 (see FIG. 4), and the flat portion is provided with an extension 100 by means of which the other end of the board may be supported. An upstanding stud 19 may be provided for supporting the portion 12, the stud extending through the extension 12a and a plurality of nuts 20 being provided on the stud above and below the portion 12a. The other end of the board may be supported by means of a standard 21 fixed on the table 18 with the portion 10a being fixed to a collar 22 that in turn is fixed on the standard 21.

The portion 10 is provided with a lip-like extension 23 meeting with the portion 10 along the line 17. A slot 24 is provided in the portions 10 and 23, and a rod 25 is fixed at one end to the lip portion 23 and terminates substantially above the line 14.

The dispositions of the slot 24 and of the bar 25 are preferably those set forth in the co-pending application of Richard H. Frick and Herbert C. Scholz, Ser. No. 567,440, hereinabove referred to, in order that a web passing through the slot 24 and over the bar 25 will not be wrinkled, and these relationships are briefly the following:

Cos L-One fl W T811 W Tan The angle M denotes the angle at which the slot 24 is disposed with respect to a vertical line 26 that extends upwardly on the flat portion 10 from a point 27, which is the substantial point of intersection of the slot 24 and the inner or folding edge 25a of the bar 25. Assuming that the portion 12 is horizontal, the line 26 lies in a vertical plane which also includes a line 28 that is a longitudinal center line of a stack of interfolded webs, with the plane being parallel with the direction of movement X of the folded webs. The side edge of the stack of folded webs, as will hereinafter appear, is substantially along the line 14, and a line 29 is an imaginary line in the flat portion 10 extending upwardly and in the same vertical plane as the line 14. The lines 26 and 29 are, of course, parallel, and the same is true for the lines 14 and 28. The angle N is the angle between the bar 25 and the line 14 which is parallel with the direction of web travel X. The angle L is the angle at which the portion 10 extends with respect to the portion 12. The quantity W is equal to the width of the web portion which is folded over by the bar 25-the quantity W may, for example, in the case to be hereinafter described, be equal to One-half the width of the interfolded stack of webs or one-fourth the width of a web prior to any folding. The distance f is the distance from the line 17 to a line 30, which is the distance W in length and which intersects with both the lines 24 and 29 and is parallel to the line 17. The distance e is the component of the distance f along the path X and l is the distance from the line 17 to the intersection of the bar .25 and the line 14.

A paper web p from a roll 31 of paper web is supplied to the first folding device A (see FIG. 1). A guide bar 32 receives the web p from the roll 31; and the bar 32 is suitably mounted with respect to the table 18, at a degree angle with respect to the direction X at which the webs pass under the folding devices on the table 18. The standard 21 for the device A is provided with a guide roll 33 at its upper end, and the web 2 passes from the guide bar 32 onto the roll 33 and from thence onto the lower face of the fiat portion 10 of the first folding device A All of the type A folding devices in the folding mechanism are identical. A type B folding device is a reverse image of a type A folding device as above described, and the first folding device B in the series is shown in FIGS. 5 and 6. Each of the devices B basically is made up of plane sheet metal portions 10, 11' and 12, slots 24' and rods 25', and these parts are in the same dispositions with respect to each other as have been previously mentioned with respect to corresponding parts in a type A device. The first type B folding device B is supplied with a web q from a roll 31 which passes over a guide bar 32 to a roll 33, and these parts correspond with the similarly numbered parts described above in connection with the first folding device A The subsequent folding devices A and B illustrated in FIG. 1 are similarly supplied with webs r and s respectively, and still additional folding devices in the series (not illustrated) are similarly supplied with webs t, u, v, w, x, y and 2 (not shown in FIG. 1).

The series of type A and type B folding devices alternately arranged, as illustrated in FIG. 1, may be utilized for producing an interfolded web as illustrated in FIG. 7. In this case, the folding devices function substantially the same as the two types of folding devices described in the above mentioned patent to Greiner et al., No. 3,066,932; and, in this case, the slots 24 and 24' and the rods 25 and 25' of the folding devices are not used.

For such interfolding, the webs (q to z) passing onto their respective folding boards each has a longitudinal one-half of it passing down the lower surface of the plane portion 10 or 10' and under the lip 23 or 23 into a path of movement of the folded stack of webs in the direction X along the upper surface of the table 18. The other longitudinal halves of the webs pass under the plane portions 10 or 10', under the plane portions 11 or 11, under the plane portions 12 or 12' and around the folding edges 15 or 15 so that these halves of the Webs are folded underneath the first longitudinal halves of the Webs. If the particular 'board under consideration is one of the boards subsequent to the first board A the second longitudinal one-half of the web being folded under the first longitudinal one-half is at the same time also inserted underneath the uppermost fold of the stack of webs folded by previous folding boards.

The operation of the folding board B is particularly shown in FIG. 5, and it will be observed that the left half of the web q, as the device B is illustrated in this figure, passes downwardly underneath the plane portion 10 and under the lip 23 to move in the path of travel of the interfolded webs indicated by the arrow X. The right half of the web q passes downwardly on the lower surface of the plane portion 10', around the bend line 13, on the undersurface of the plane portion 11', around the bend line 14', on the undersurface of the plane portion 12' and from thence around the edge 15' of the portion 12 to thereby underfold this half of the web underneath the first half of the web that passes underneath the lip 23'. The half of the web passing underneath the lip 23 is indicated by the web fold q in FIGS. 2 and 5, and the half of the web underfolded by passing around the portions 10, 11' and 12' is indicated by the web fold q in these figures.

The web p has been folded by the previous board A and the upper fold p of this web has been trained to pass over and to lie in contact with the upper surface of the plane portion 12' of the board B so that as the lower fold q is folded by the folding edge 15' underneath the top fold q the fold q is at the same time positioned under- .neath the top fold p of the previous web p. Thus, the Web q has been longitudinally interfolded by the folding board B; with the previously folded web p.

The subsequent folding device A functions substantially in the same manner except that it folds a web from the other side of the stack, and the similar operation of the board A is illustrated in FIG. 2. As seen in this figure, the right half of the web 1' passes underneath the portion 10 and the lip 23 into the path X so as to become the web fold r The left half of the web r passes underneath the portions 10, 11 and 12 and from thence around the folding edge 15 so as to be folded underneath the web fold r to thereby become the web fold r The web fold 11 of the interfolded stack of webs leaving the folding device B is trained to pass over the horizontal plane portion 12, and the web fold r is thereby not only folded under the web fold r but is also at the same time folded under the web fold q on the top of the previously folded stack of webs so as to complete the interfolding.

The first folding device A functions in exactly the same manner as the folding device A except that, inasmuch as the folding board A is the first of the series of boards, there are no previously interfolded webs; and the folding board A thus simply has the effect of folding the fold p under the fold p;,,.

The subsequent type A boards function in the same manner as the type A boards just described, and the subsequent type B boards function in the same manner as the board B All of the folding boards, subsequent to the first board A function similarly to underfold a longitudinal half of the web passing over the board as well as to fold a longitudinal half of this web underneath the uppermost fold of the previously interfolded stack of webs. It will be understood that, for setting up the folding mechanism, each of the individual webs is threaded over its respective folding board A B A B etc., and the resultant webs are interfolded by hand in the movement path X; and, in order to set the machine in operation, the webs in their interfolded condition are simply drawn along in the path X by any suitable web pulling mechanism (not shown) so that individual webs are drawn over their individual folding boards and along the path X.

The boards A B A B etc., function with respect to webs p, q, r, s and t, in order to produce the interfolded stack of webs which is shown in FIG. 7. Referring to FIG. 7, it will be observed that the web fold q lies between the web folds p and 11 the web folds 1' and p lie between the web folds q and g the web folds q; and s lie between the web folds r and r the web folds 1' and t lie between the web folds s and s and the web fold s lies between the web folds t and t so that the stack of webs is effectively interfolded. Thus, if the elongate stack of folded webs is cut into segments, the top fold t of the stack may be grasped; and in pulling and in removing the cut segment of the web t from the stack, the fold A; will at the same time be pulled upwardly; and, assuming that the segment of interfolded webs is in a carton with a dispensing window in its top panel, the top fold s will be partially pulled through the window for subsequent removal. This particular arrangement of interfolded webs is particularly suitable if the webs are of creped tissue suitable for facial usage, and the tissues may thus be removed one at a time from the enclosing carton, and each tissue will pull a fold of the succeeding tissue into view for ready subsequent usage. Although only the five webs p, q, r, s and t have been illustrated in FIG. 7, it will be obvious that the succeeding folding boards in the series will produce subsequent folded webs which are interfolded with themselves and with previously folded webs in the same manner and with the same pattern as is illustrated with respect to the webs p to t in FIG. 7.

In the event that it is desired to produce a non-interfolded stack of webs, the slots 24 and 24 and the folding rods 25 and 25' may be utilized. In this case, each of the folding devices is threaded in a slightly different manner with the particular web folded by the device.

Referring to FIG. 3 illustrating the folding device A it will be observed that the right fourth of the web r is directed through the slot 24 and over the folding bar 25 instead of passing underneath the lip 23 with the rest of the right half width of web r. The distance from the point 16 to the end of the slot 24 at point 27, in the particular form of the folding device illustrated, is equal to one-fourth the width of the complete web r, and the right one-fourth of the web r as it passes through the slot 24 and over the folding rod 25 is folded over the other one-fourth of the web which would otherwise constitute a part of the web fold r if the board A were used as first described. Thus, as is illustrated in FIG. 3, with the slot 24 and the rod 25 being utilized; the folding device A folds the half web fold or width r underneath; a quarter fold r passes underneath the lip 23 so as to remain on top of the web fold 1' and a quarter width web fold r is folded on top of the quarter width web fold r None of the previously folded webs, utilizing the boards in this manner, passes over the plane portion 12; and, therefore, there is no interfolding. The web p is folded by the first type A board in the same manner as the web r is folded by the board A and the web p appears as shown in FIG. 3; with a bottom half width fold p and upper quarter folds p and 17 The board B functioning in the same manner as do the type A boards as just described, has the left onequarter of the web q passing through its slot 24 and over its folding bar 25 (see FIG. 6). The board B folds in the same manner as the boards A and A but in the opposite direction so that the board B produces a lower one-half width web fold q, and upper one-quarter width folds q and q.,,.

The boards as used in this manner do not interfold, and the stack produced by the boards operating in this manner is illustrated in FIG. 8. All of the webs are folded in the same manner so that each has two, one-fourth width, folds located above a full one-half width fold. This folding may be termed a modified Z-fold, and the webs simply lie one on another. Due to the fact that the type A boards and type B boards fold in opposite directions, the one-fourth width folds lie on opposite sides of the stack and the crease or f-old between the quarter width folds lies substantially on the longitudinal center line of the stack of folded webs. If the webs p, q, r, s and t are of facial quality tissue cut into segments and packaged in cartons with openings in the top panels, the segments of the individual webs may be withdrawn through the top openings individually without disturbance of the webs located underneath, since the boards used in this manner do not interfold the webs. In particular, referring to FIG. 8, it will be observed that the web p, with its half fold p and its quarter folds p and p is located in the stack completely beneath all parts of the web q. Likewise, the web q, with its half fold q and its quarter folds (1 and 11 is located below all parts of the succeeding webs r, s and t. Also, it will be observed that the quarter folds p and p extend from the left side of the stack substantially to the longitudinal center of the stack while the quarter folds q and (1 of the web q also extend substantially to the longitudinal center of the stack, but from the right hand side of the stack. The other webs alternate from opposite sides of the stack as illustrated. Since the quarter folds of the individual webs extend to the longitudinal center of the stack, the crease between the quarter folds of the uppermost web segment may be easily grasped by a person thrusting his hand through the tissue withdrawal opening in the top panel of a carton in which segments of the folded webs are packaged, so that the uppermost web can be easily grasped and withdrawn from the carton.

It is also possible using the modified Z-fold and using the type A and type B boards in the manner just described, to interfold the paper webs, and the webs as so interfolded are illustrated in FIG. 9. In this case, each of the boards after the first board A has the lowermost one-fourth fold of the previously folded web trained on and traveling over the horizontal plane portion 12 or 12' of the board, so that the half fold of the web folded by the particular board is inserted between the half fold and the lowermost quarter fold of the previously folded web.

As previously described in connection with FIG. 6, the folding board B has the effect of folding the half width fold q, under the fold q;; and folding the: quarter width fold up, over the fold q If the fold p of the previously folded web is made to travel on and pass over the upper surface of the plane portion 12' of the board B the fold q is inserted between the folds p and 17 as shown in FIG. 9. The operation of the board A in utilizing the slot 24 and rod 25 is illustrated in FIG. 3; and, as previously described, the board operating in this manner underfolds the one-half width fold r under the one-fourth width fold 1' and overfolds the one-fourth width fold r over the one-quarter width fold r If the fold (1 from the previously folded web is made to pass along and over the upper surface of the plane portion 12 of the board A the fold r is positioned between the folds q and g as shown in FIG. 9. The first folding board A functions in the same manner as the board A but there is no previously folded web traveling under the board A into which its lower one-half width fold p may be positioned.

The subsequent type A boards and the subsequent type B boards function in the same manner as just described in connection with the board A and the board B to fold the lowermost one-half width fold produced by the particular board in between the one-half width and lowermost one-fourth width folds produced by the previous folding board, and thus the type of interfolding in FIG. 9 is produced by the boards operating in this manner. With this type of interfolding, it will be observed that the onequarter width folds of any particular web having the subscripts 3 and 4 are positioned bet-ween the one-half width folds of the subsequent two webs. For example, the folds p and p from the web p passing over the folding board A are located between the one-half width folds q and r of the subsequent two webs q and r. As will be observed, on the top of the stack as shown in FIG. 9, there are four folds present, namely the folds Z3, Z4, 31/ and y; Each of these folds is one-fourth width and therefore the fold lines between these folds lie along the longitudinal center of the stack. Therefore, assuming that a segment of the stack as illustrated in FIG. 9 is positioned in a cartoon with a windowed top panel, the users hand may be reached into the carton through the window and either of the webs z or y may be grasped in order to remove a web segment from the carton. Since the webs are interfolder, a withdrawal of one web from the carton acts to pull a lower web partially through the window of the carton so as to make it available. In order to increase the adherence of one web with respect to the other to promote this action, the tissue webs as so folder may be compressed, such as for example, as is described in Patents 3,172,563, issued to kenneth J. Harwood on Mar. 9, 1965, and 3,172,564 issued to Kenneth M. Enloe and LeRoy L. Peterson on Mar. 9, 1965; and such compression also has the effect, as described in these patents, of allowing the webs to be packed in cartons of less height than would otherwise be possible.

Referring to FIG. 8, it will be observed that the modified Z-folded webs, without interfolding, provide an edge on the top of the stack along the longitudinal center line of the stack, which is a folded edge rather than a cut edge. With this arrangement, there is no opposite edge, cut or otherwise, on the top surface of the stack; and a person may easily grasp the folded edge on the top of a cut segment of the web stack for the purpose of removing the top web out of a carton, for example, for the cut segment.

In addition, it will be noted that since the folded edge on the top of the stack extends to the longitudinal center line of the stack, the stack may be exactly one-half the width of each of the webs before folding. A stack, such as is illustrated in FIG. 8, is shown positioned in FIG. 11 within a carton 34 having an oval shaped perforation line 35 in its top panel for the purpose of providing an opening in the top panel when the perforation line is broken. Since the FIG. 8 stack is equal in width to onehalf the width of a tissue web prior to folding, the carton 34 may be only slightly greater in width than this dimension.

The conventional tissues now on the market which are individually removable from a carton are ordinarily C- folded, as illustrated in FIG. 10, each tissue comprising a lowear bottom fold k extending for the width of the stack and upper narrower folds k and k A carton 34a for the C-folded tissues is slightly larger than the stack of tissues in width and is also commonly provided with an oval shaped perforation line 35a which provides an Opening in the top panel for removal of the tissues one at a time from the carton. A gap of about /2 inch is commonly provided between the inner cut edges of the folds k and it so as to allow a person reaching through the opening in the top panel to grasp one or the other of the cut edges forming the ends of the folds k and k of the uppermost web segments. Dut to this gap between the folds k and k the width of the stack of webs must be greater than onehalf the width of a web in its unfolded condition; and, therefore, both the width of the C-folded stack of webs as well as the width of the carton for the stack segments must be greater than the widths of the stack of web segments and carton, respectively, using the modified Z-fold, as will be noted from comparing FIG. 10 with FIG. 11. Thus, a carton for the modified Z-folded tissues may be less space consuming than a carton for the conventional C-folded tissues.

With respect to the modified Z-folded tissues as interfolded, illustrated in FIG. 9, the width of the stack also may be exactly equal to one-half the width of a web as contrasted to the C-folded tissues, a stack of which has a width greater than one-half the web width.

The combination folding boards A B A ,B etc., which may be used to either provide a modified Z-fold as illustrated in FIG. 8, or a conventional inter-fold as illustrated in FIG. 7, allow the machine to be used for making either type of tissue stack with only a rethreading of webs to make the change. In this connection, it may be desirable to utilize the FIG. 8 type of folding with relatively deep cartons, while utilizing the FIG. 7 interfold ing with thinner cartons and simply by rethreading the same machine, either type of folding may be produced, and two separate machines are not necessary.

It is to be understood that the invention is not to be limited to the specific constructions, arrangements and devices shown and described, except only insofar as the claims may be so limited, as it will :be understood to those skilled in the art that changes may be made without departing from the principles of the invention.

What is claimed is:

1. In a machine for folding uniform width webs of sheet material into a stack of a width of one-half web width, a plurality of folding devices disposed in series and each adapted to fold a web drawn over the device and along an ultimate path of travel, each of said folding devices having web guide means over which a longitudinal intermediate zone of its respective web may be drawn along said path without being folded over or under adjacent web zones and each said folding device including first folding means across which a first web edge zone on one side of said intermediate zone may be drawn and which folds the web zone underneath said intermediate web zone along a first fold line and each said folding device also including second folding means across which a second web edge zone on the other side of said intermediate zone may be drawn for the purpose of overfolding said second edge zone over said intermediate zone on a second fold line, said folding devices being positioned with respect to each other so that said first fold line produced by said folding devices are substantially on the longitudinal center of the respective webs folded by said devices and on opposite sides of said path for alternate ones of said folding devices in said series and the second fold lines for alternate ones of said folding devices in the series are disposed substantially one-fourth the width of the web from opposite edges of the respective webs folded by the devices as the webs travel over said folding devices into said path so that the machine produces an elongate stack of folded webs in said path with each web being overfolded from substantially the longitudinal center of the stack to an edge of the stack.

2. In a machine as set forth in claim 1, said guide means of each said folding device including a first straight edge over which the longitudinal intermediate zone passes and said first folding means including a second folding edge having a point of intersection with said first edge and extending along one edge of said path, a third folding edge extending diagonally from said point to the other edge of said path with said three folding edges disposed in a common plane, and a fourth folding edge extending at obtuse angles with respect to said first and second folding edges whereby the first web edge zone of the respective web passes successively over said fourth, second and third folding edges to be folded underneath said intermediate web zone.

3. In a machine as set forth in claim 2, said second folding means of each said folding device including a fifth folding edge disposed in a common plane with said fourth folding edge and extending from a point spaced from said first named point and at an obtuse angle with respect to said first folding edge and a sixth folding edge extending from said second named point obliquely to said second folding edge whereby said second edge zone of the respective web passes successively over said fifth and sixth folding edges to be folded over said intermediate zone.

4. In a machine for folding a stack of webs of sheet material, a plurality of folding devices disposed in tandem and each adapted to fold a web drawn over the device and along an ultimate path of travel, each of said folding devices having a surface over which a longitudinal intermediate zone of its respective Web may be drawn along said path without being folded over or under adjacent web zones, each said folding device also having a plurality of folding edges across which a first web edge zone on one side of said intermediate zone may be drawn and which fold the edge zone underneath said intermediate web zone, each said folding device also having a plurality of other folding edges across which a second web edge zone on the other side of said intermediate zone may be drawn for the purpose of overfolding said second edge zone over said intermediate zone whereby to produce a stack of such folded webs traveling in said path, said surface of each of said folding devices extending at an angle with respect to said ultimate path and having the complete Width of the web folded by the device passing over said surface, said plurality of other folding edges including an edge in said surface and an edge providing bar in said path and extending at an acute angle across said path, said second edge zone passing sequentially over said first edge and over said bar so as to overfold said second edge zone over said intermediate zone.

5. In a machine for folding a stack of webs of sheet material, a plurality of folding devices disposed in tandem and each adapted to fold a web drawn over the device and along an ultimate path of travel, each of said folding devices having a surface over which a longitudinal intermediate zone of its respective web may be drawn along said path without being folded over or under adjacent web zones, each said folding device also having a plurality of folding edges across which a first web edge zone on one side of said intermediate zone may be drawn and which fold the edge zone underneath said intermediate web zone, each said folding device also having a plurality of other folding edges across which a second web edge zone on the other side of said intermediate zone may be drawn for the purpose of overfolding said second edge zone over said intermediate zone whereby to produce a stack of such folded webs traveling in said path, said surface of each of said folding devices extending at an angle With respect to said ultimate path and having the complete width of the web folded by the device passing over said surface, said first named plurality of folding edges including a first edge in said surface, a second edge extending in said ultimate path and at the edge of the said stack, and a third edge in said path and extending at an acute angle across said path, said first edge zone passing over said first, second and third edges sequentially in order to fold said first edge zone underneath said intermediate web zone, said plurality of other folding edges including a fourth edge in said surface and a fifth edge provided by a bar in said path and extending at an acute angle across said path, said second edge zone passing sequentially over said fourth and fifth edges so as to overfold said second edge zone over said intermediate zone.

References Cited UNITED STATES PATENTS 10/1965 Presnell et al. 27040 12/ 1966 Couzens et al 27040

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3199861 *Apr 10, 1961Aug 10, 1965Scott Paper CoApparatus for folding web material
US3291478 *May 25, 1964Dec 13, 1966Deitz Machine WorksApparatus for producing z-folded web material
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3841620 *Feb 12, 1971Oct 15, 1974Int Paper CoWeb folding apparatus and method
US4131271 *Jun 13, 1977Dec 26, 1978Paper Converting Machine CompanyMethod and apparatus for interfolding
US4502675 *Jul 15, 1983Mar 5, 1985Kimberly-Clark CorporationLongitudinal folding of webs, folding board system therefor
US6045002 *Jul 10, 1998Apr 4, 2000Paper Converting Machine CompanyStack comprising V-Z folded sheets
US6168848Oct 7, 1999Jan 2, 2001Paper Converting Machine Co.Stack comprising W-Z folded sheets
US6565500 *Aug 8, 2000May 20, 2003The Procter & Gamble CompanyMethod for batch production of stacks of folded sheets
US6599228 *Dec 3, 2002Jul 29, 2003The Procter & Gamble CompanyDevice for batch production of folded sheets
US6604651Mar 21, 2001Aug 12, 2003Kimberly-Clark Worldwide, Inc.Storage and dispensing package for wipes
US6730012 *Oct 1, 2001May 4, 2004Uni-Charm CorporationProcess for manufacturing sheet stack
US6740021Dec 28, 2001May 25, 2004Kimberly Clark Worldwide, Inc.Device and method for longitudinally folding a stack of webs
US6749083May 12, 2003Jun 15, 2004Kimberly-Clark Worldwide, Inc.Stack of fan folded material and combinations thereof
US6840401Dec 19, 2002Jan 11, 2005Kimberly-Clark Worldwide, Inc.Multiple layer baffle structure for dispenser for wipes
US6905748May 31, 2001Jun 14, 2005Kimberly-Clark Worldwide, Inc.Stack of fan folded material and combinations thereof
US7008364Sep 27, 2002Mar 7, 2006C.G. Bretting Manufacturing Company, Inc.Sheet folding apparatus and method
US7081080 *May 30, 2002Jul 25, 2006Kimberly-Clark Worldwide, Inc.Stack of fan folded material and combinations thereof
US7625333 *Oct 20, 2003Dec 1, 2009Georiga-Pacific Consumer Products LPSingle-ply dispenser napkin
US7758486Feb 2, 2006Jul 20, 2010C.G. Bretting Manufacturing CompanySheet folding apparatus and method
US8097326Oct 27, 2008Jan 17, 2012Paper Converting Machine CompanyStack comprising multi-folded four panel sheets and folding boards therefor
EP0747313A1 *Jun 9, 1995Dec 11, 1996Katsu YoneyamaMultiple folded paper for continuous disposal
Classifications
U.S. Classification270/40
International ClassificationB65H45/24, B65H45/12
Cooperative ClassificationB65H45/24, A47K2010/428
European ClassificationB65H45/24