US2072790A - Paper folding machine - Google Patents

Description

March 2,1937. M Amuse, E r'AL 2,072,790

' PAPER FoL'DInfG MACHINE Filed Oct. 16, 1935 5 Sheets-Shea?l l March" 2, 1937.

M. APH-zscH E1- Al.

PAPER FOLDING'MACHIINE 5 Sheets-Sheet 2 Filed Oct. 16, 1955 March 2, 193? M. APlTzscH Er AL PAPER FOLDING MACHINE Filed oet. 16; 1955 5 Sheets-SheetI 3 f2 from yl Mard '2, 1937- M, APrrzcH E1' AL 2,072,790

PAPER FOLDING MACHINE Filed Oct. 16. 1935 5 Sheets-Sheet 4 March 2, 1937. MrAPlTzscH ET AL .PAPER FOLDING MACHINE Filed oct. 15. 1955 5 sheets-sheet 5 lNvENToRs MAX APITZS C'H OSCAR "KLEINSCHMIT By M @0% UQ TT'OP/VEY Patented Mar. z, 1937 UNITED STATES PAPER FOLDING MACm Max Apitxsch and Oscar Kleinachmlt, .Leipzigf Plagwitz, Germany, assignorsjo Gebruder Brehmer, Leipzig-Plagwitl, Germany, a Gerfirm man Application october 1e, 1935, semi No. 45.322

In Germany January 31, 1935 e5 claims. (ci 27o-cz) 'Ihis invention. relates to improvements in machines for folding paper or like sheets enabling the sheets in their passage through the machine to be folded and if desired also cross folded with great accuracy without -the use of any timed mechanism such as'the customary folding knife or like device. It is concerned more particularly with a method of folding as described in the specification of U. S. Patent No."v 1,961,000, according to which the sheets to be folded are fed over a pair of inversely rotating fold rolls and are brought into contact with a guide associated with the fold rolls with its folding edge so shaped that .the sheets are progressively pressed between the'rolls, and on being seized by the latter are foldedthereby along the line of contact of theredge of the fold guide with the sheet. The means particularly described and claimed in the prior patent specication for carrying the method into effect involve the use of a stationary fold guide.

Now the object of the present invention is to carry said method into eect by the provision of means modified to enable a moving fold guide or like member to be employed with satisfactory results. To this end according to the inventiona movable guide provided to co-operate with the fold rollsis employed to cause a sheetin its passage over thel rolls to be directed into the bite of the rolls while moving along a 'path inclined to the longitudinal axes of the rolls.

By virtue of this arrangement the edge of the fold guide on meetingthe sheet travels therewith while guiding the sheet between the foldrolls with a gradually progressive pressure, so reducing drag upon the sheets and entirely obviating such drag if the fold guide is setto travel at the same speed as the sheet. Moreover by -performing the foiding of the sheets in this manner, dis.- tortion of the work is avoided, with the additional advantage over the known timed knife folding methods in that squeezing or secondary folds do *not occur or occur only to a much smaller extent,

whileat the opposite point of the li'ne of folding v the present invention for cross folding the sheets' fed thereto, from the preceding buckle fold set,

' Fig. 2 isa plan view of the arrangement shown inFig. 1, partly broken away to avoid a confusion of the parts, ,I

' Fig. 2a is a fragmentary plan view showing the mounting ofthe adjustable head-stop.

Fig. 8 is a fragmentary elevational view showing an alternative arrangement of the folding def vice of this invention;

Fig. 9 is a fragmentary elevational view showing an alternative arrangement of the cross-fold rolls, and

Fig. 10 is a plan view of the fold rolls shown in Referring more particularly to Fig. 1 the sheet folding machine shown in the drawings comprises a sheet feed table A, buckle fold section B, the cross fold section C and a delivery conveyor D. The table A is indicated as a work support upon which the sheets to be parallel folded are progressed to the first fold set of the buckle fold section. B. The fold section B does not form a specific part of the construction according to the present invention and therefore is merely diagrammatically indicatedas comprising fold rolls I0 with which are associated in well known manner'the buckle plates II, buckling stops I2 and vsheet defiector Il. Scoring discs Il are interposed between the delivery roll Ila of the third buckle 'fold' set and the cross fold section C. The y discs Il are arranged transversely to score the parallel folded sheets along the line of ,the proposed cross fold as the parallel folded sheets are fed to the cross fold section C.

Referring to Figs. 1, 2, and 3, the framework of i the machine includes side framesY I5 and transverse frame plates I6: The rolls I0 are journalled in the side frames I5 while the buckle plates Il are supported by suitable ybrackets -(not shown) also secured to the said frames. Shafts I l, journalled in the frames I5, serve to carry the scoring discs I4 and also have mounted thereon pairs of rolls I8 which co-operate to feed the parallel folded sheets to the cross fold sectionC. f

Rolls I9, journalle'd 'in the cross frame members I 6 are set between the side frames I5 and at right angles to the fold rolls I0 to constitute the folding means of the fold section C.

The rolls I9 are set-level with the roll Illa, and the sheets to be cross folded are conveyed thereto bycontinuous conveyor tapes 2l. Shafts 2|, Zia, 2Ib, andv 2Ic extending parallel with the shaft Il and also journalled inside frames I5 to either end of the rolls I9, are provided with pulleys 2| d around which pass the. continuous conveyor tapes 20. A roll 22, carried by a shaft 22a which may engage in guide slots in the frames |5, rests in the bights of the tapes 20 as shown in Fig. 1 to tension the tapes in usual manner. The tapes 20 are driven from a friction disc 23 mounted upon a drive shaft 23a. Alternatively any or all of the shafts 2|-2Ic may be driven to eifect the drive of the conveyor'tapes. Side guides 24 are associated with the conveyor tapes 20 to guide the sheets along the correct path of travel. To this end the side guides 24.comprise members of L-shaped cross section extending parallel with the tapes 20 andsuspended from a..

cross bar' 25 -by clamps 26 so as to be laterally adjustable transversely of the conveyor tapes. Retaining strips 24E? are associated with the side guides `211 to retain therein the edges of the guided sheets. The cross bar 25 is secured at its extremities to the side frames i5 and also has attached thereto a blade spring 21 which extends towards the scoring discs i4 and bends downward to terminate immediately above a roll 29 which is carried by the shaft 2l and aligned with Athe scoring discs I4. A runner or follower disc -3|) carried in a bearing bracket secured to the free end of the bladespring 21 is set above the roll 29 to bear upon the sheets passing to the tapes "and is aligned with the scoring discs i4 so as to enter the grooves scored inthe sheets, thereby to afford additional guidance to the latterin their passage to the cross fold section.

As shown in Figs. 2 and 3, rods 46 are suspended from the cross bar 25 by adjustable clamping brackets 41 so as to extend longitudinally of the inner conveyor tapes 20. The rods 46 are laterally adjustable along the cross bar 25 and serve to carry brackets 49. Arms 50 secured to the brackets 49 and extending parallel with the tapes 20 have discs orv runners 5| mounted at their free extremities to engage the sheets and press the latter into engagement with the tapes`20. Plates 52 set beneath the upper stretches of the inner conveyor tapes 25 and extending longitudinally thereof provide a bearing surface whereby the tapes are supported in firm contact with the work conveyed thereby. The inner edges of the plates 52 closely abut beneath the left hand portions of the tapes-2li but are aredoutward towards the right handextremity of the tapes to provide a wedge shaped gap between said plates through which the sheets pass when engaged by the rolls I9.

The travelling fold guide whereby the sheets are pressed between the fold rolls I3 is constif tuted by a series -of elements such as, the bladeshaped members 3| shown in the drawings, which are constrained to move along a closed path in a vertical plane passing through the bite of the fold rolls. The individual elements or blades 3| may be mounted in spaced or abutting Yrelationship upon a carrier belt or chain or, as

shown in the drawings, are freely mounted in abutting relationship in acontinuous guideway. With this object in view a rigid structure comprising a pair of vertically disposed housing plates 32 are mounted above the rolls I9 so :as to extend longitudinally thereof and at an inclination to the horizontal. 'I'he plates 32 have their inner, opposed faces suitably fashioned to'form a continuous channel 33 4which is T-shaped in cross section. rIfhe tail of the T-channel comprises thelguideway to receive` and constrain the bladesl, while the cross piece of the T channel receives. and forms a runway for rollers 34 roltatably mounted upon pins 34a. which project outwardly on eitherl side from, and at right angles to the rblades, adjacent the bases thereof (see Figs. 1, 3, 4, and 5). The fold guide blades 3| thus freely travel along the gyuideway 33 and are shunted along by mutual contact between the blades, the initial. movement of which is achieved as hereinafter described. l

The plates Y32 are supported at the left hand extremity thereof (as viewed in Figs. l and 2) by bearing brackets 35 which are rigidly secured to the cross bar 25 so as to be laterally adjustable thereon and are 'bossed at their lower extremities to provide bearings for a'transverse stub shaft 36.

The shaft 36 passes through the plates 32 to tremities of the links 39 are secured by a pin 39h to a slide 4Q. grooved bracket 4|, rigidly secured to a cross bar 42 and laterally adjustable thereon, slidably supports the slide whilethe relative position of the members 40, '4| is deter-V mined by a set screw 43 which passes throughfa threaded hole in the Llug of the slide 40 to engage the bracket 4|. Thus, the right hand end of the plate 32 can be raised or lowered about the axis of the shaft 36 to adjust Athe depth of the downward movement of the guide blades 3| and the inclination of the path of travel thereof relatively to the longitudinal axes of the fold rolls |9 and it will be obvious that if desired the left hand mounting of the housing plates 32 may similarly be adjustable. Moreover, by suitably displacing the brackets 35 and 4| along-their respective cross bars the position of the fold guide is also laterally adjustable relatively to the fold rolls.

Referring more particularly to Figs. 1f'and'4, the. continuous guideway 33 is shown to comprise upper and lower T-section slots spaced apart and joined at their extremities by senil-circular slots of similar cross-section having .their radial centres upon the axes of the sprocket wheel 31 and pin 33a respectively. Each guide blade 3| is provided with two pairs of rollers 34 which are arranged so that, with the'blades closely abutting, the rollers 34 are equally spaced apart in the manner of the rollers of a' sprocket chain. The lteeth of the sprocket wheel 31 enter between the rollers of the blades which enter the left hand curved extremity ofthe guideway 33 so Vthat in the rotation of the wheel 31 each roller engaged by the teeth receives a driving thrust to urge the blades along the guideway as a collective body. Asshown in Figs. 1, 3, 4,A and 5, the guide blades 3`| when moving along the lower stretch' of the path on guideway n33 project downwardly beyond the lower edges of the plates 32 in such manner that the lower edges of the projecting blades form a continuous edge' which 'is inclined to the longitudinal axes of the rollsl I9 and when approaching the right hand end of the latter passes into the space immediately above the contacting rolls. Thesprocket shaft 36 is driven from a gear shaft 45 through the inter-AV "adjustable head stop is located to the right hand.

end of the rolls I9 (as viewed in Figs. 1 and 2) immediately above the sheet carrying stretches of the conveyor tapes 20. For this purpose, an angle bracket 53 (Figs. 2a, 6, and 7) is mounted upon a cross bar 54 forming part of one transverse frame member I6 (Fig. 2). The angle bracket comprises a horizontal body 53a, a tail piece- 53h extending downwardly therefrom for clamping to the cross bar 54 and an upwardly extending flange 53e which is drilled to form a guide for an adjusting scgew 53. As shownin Figs. 6 and '1 the bracket body 53a is providedwith a longitudinal egroove 56 in which slides a carrier 51 having an upwardly projecting I'ug 51a which is drilled and tapped to receive the threaded portion of the lscrew 55.A Collars 55a pinned to the screw 55to each side of the flange 53c'restrain the screw from longitudinal movement so that in the rotation thereof the carrier 51 is displaced in the groove 56. A shouldered set screw 38 passes through a slot 51h formed in the carrier 51 to engage the threads of a hole tapped in the bracket 53. When screwed downwards the screw 58 serves to clamp the carrier 51 in the adjusted position. The outwardly projecting extremity of the carrier is bifurcated to form arms 59 winch embrace the right hand extremities of the plates 32 and serve to support rails 60 which ex- 'tend outwardly at right anglesgto the arms 59. Adjustable lay stops comprising U-shaped members 6| are adapted to embrace the rails 60 and are adjustably clamped theretov by setscrews 62.

The work engaging faces of the lay stops 6I are fashioned so as to offer a minimum of surface to I Contact with the work engaged thereby andare suitably arranged by lateral adjustment valong the rails G0 to engage the leading edges of the folded sheets at points adjacent the lateral edges of the latter.' Extremely ne adjustment of the Astops longitudinally of the rolls I9 is effected by rotation ofthe screw 55.

In an alternative arrangement of the cross fold section C as shown in Fig. 8, the conveyor tapes 20 are-slightly inclined to the longitudinal axes .of the rolls I 9. The tapes are inclined in the 'opposite direction to the inclination of the fold guides 3| and thus rise upwardly from the rolls I9 in approaching the stops or lays lil.l By this 'arrangement any possible overrun of the sheets relative to the tapes is damped so that the sheets are smoothly halted when in contact with the lay stops. Furthermore by this arrangement of the tapes, the V-,foid of the depressedsheet, at its point of engagement in the bite of the rolls is somewhat deeper than in the rst described construction which is an advantage in folding certain kinds of paper since the rolls I9 are presented with a maximum surface of paper with which initially to engage.

A travelling belt conveyor 63 positioned adiacent the cross fold section serves to discharge the work which is deposited thereon from the rolls I9, I9a. v'The discharge conveyor'63 extends f outwardly from the machine at right angles to the rolls of the cross fold section and to this end ducing'a .S2-page book signature or pamphlet from a single sheet of paper is as follows..

The sheet is laid upon the table A and progressed towards the bite of the leading pair of buckle fold rollers I0. The sheets may be fed to, and along the table A either by hand or, in the case of a fully automatic machine by a mechaniv cal sheet feeding device which isv not shown in the drawings. In passing through the buckle fold section B, three parallel folds are imparted to the sheet whichthen is fed by rolls I0, Ilia to the feed rolls "I8 and scoring discsi4. As the feed rolls I8 progress the sheets to the conveyor tapes 20 the groove scored along the folded sheet by the discs I4 is entered by the runner disc 30 while the lateral edges of the folded sheet engage the side guides 24. 'I'he sheet, pressed upon the conveyor tapes 20 by the runners- 5I,

are conveyed above the rolls I9 in a path parallel with the longitudinal axes thereof while the guide blades 3i are moved downwards in a path inclined to the rolls to meet and engage the sheet. Since the guideblades are travelling at a speed substantially the same as the speed of the travel of the sheet, and the angle of inclination of the moving line of guide blades to the surface of the sheet is comparatively small the relative displacement of the sheet and contacting guide blades is negligible so that the sheet is progressively pressed between the rollers by the downwardly moving guid'e blades with a minimum 'of friction or distortion of the work. When the depressed point of the head ofY the signature reaches the bite of the cross fold rolls I9`which coincides with the registration of the leading edge of the signature with the lay stops 6I. the rolls seize the depressed portion of the work and cross fold the entire signature in drawing it through the' cross folded signaturesawith their edges fat an angle .to the axes of the rolls is immaterial, ybut if it is desired to discharge the signatures with the line of thecross fold at right angles to the direction of their subsequent travel as" would be vdesirable if further folding of the signatures is to be effected, the rolls preferably would be formed frusto-conical in shape as shown in Figs. 9 and l0, so that while the leading edge or head of the signature would be oblique to the axes of the rolls when 4engaged thereby the completely1 folded signature wouldbe delivered therefrom with its leading edge positioned at the desired angle. As shown in Figs. 9 and 10, the. third roll I9a of the normal cross fold set is replaced by a deecting plate 65 whereby the cross folded sheet as it emerges from the bite of the frusto-conical fold roll I9 is guided onto the discharge conveyor 63 or directed into a further fold set (not shown).

The signatures folded in this manner can either be stacked by thev discharge conveyor as shown in Fig. 3 or may be fed to another fold section (not shown) which may for example operate. in a manner similar to that of the cross fold sec, tion above described. A,

To those skilled in the art it will be obviousv that the invention as herein defined constitutes a folding unit not only useful as a machinebyY itself, but also useful as an attachment applicable to any kind of sheet folding machine without material deviation, while the particular construction herein described may'be readily modiiied without departing from the spirit of the invention as hereinafter set forth.

We claim:- i. In a machine for folding sheets, afold unit 5 comprising co-operating fold rolls, work conveying means arranged to present a sheet to said trolls, a, travelling guide member arranged to move along a path inclined to the longitudinal axes of y said rolls and leading to the bite thereof, and. '10 means for moving said guide member. along said path to engage the presented sheet and deect it into the bite of said rolls. l

In a machine for folding sheets, a fold unit comprising'co-operating fold rolls, work conveying means arranged to present a sheet to said rolls, a travelling guide member arranged to move along a path inclined to the longitudinal axes ofsaid rolls and lying in a plane which passes through the bite thereof, and means for-moving said guide member along said path to engage the presented sheet and deflect it into the bite of said rolls.

` 3. In a machine for folding sheets, a` fold unit comprising co-operating fold rolls, work conveying reans for progressing a. sheet longitudinally of said rolls, a travelling guide member arranged to move along a path inclined to the longitudinal axes of said rolls and leading t the bite thereof, and means for movingsaid guide along said path to engage the sheet progressively along its intended fold line and deflect it into the bite of said rolls. 'f

4. In a machine for folding sheets, a fold unit A comprising co-operating foldV rolls, la travelling guide member arranged to move along a path inclined to the longitudinal axes of said rolls and leading to the bite thereof, conveying means for' moving a sheet between said rolls and said guide member. and means for moving said guide mem- 40 bei' along said path progressively to engage the sheet and press it into the bite of said rolls. 5. In a machine for folding sheets, a fold unit comprising co-operating fold rolls, a travelling guidemember arranged to move along a path inclined to the longitudinal axes of said rolls and lying in a plane which passes through the bite thereof, work conveying means for moving a sheet between said rolls and said guide member and meins forpmoving said guide to engage said sheetl and deflect it into the bite of said rolls.l y

6. In 'a machine for folding sheets, a fold u nit comprising co-op'erating fold rolls, work conveying means arranged to present-a sheet to said rolls' at a predetermined rate of travel, a travelling-'guide member arranged to move along a path vinclined to the longitudinal axes of s aid` rolls and leading to the bite thereof, and means for moving saidfguide at a speed substantially equal to' the rate of travel of the presented sheet so as progressively to engage the latter and del ect it into the bite of said rolls.

. 7. In a machine for folding sheets, a fold unit comprising co-operating fold` rolls, work convey-v ing means arranged to present a sheet-to said rolls at a predetermined rate of travel. a plu-r rality of travelling guide members arranged to move in a continuous train alonga path inclined to the longitudinal axes ofsaid rolls and leading 'to the bite thereof, "and means for movingy said 70 guide members at a speed substantially equal to the rate of travel oi the presented sheet so that a n ber of said members ccessively engage the/sheet and deflect it into the bite of said rolls.

' 8. In a. machine for folding sheets, a fold unit -75 'comprising c'o--operatingfold rolls, work conveying means arranged to present a sheet to said rolls, a plurality of travelling guide members arranged to move in a continuous train along a path inclined to the longitudinal axes of said rolls and lying in a plane which passes through the bite thereof, and means for moving said guide members so that a number of these members successively engage the sheet and deflect it into the bite oi said rolls.

9. In a machine for folding sheets, a fold unit comprising co-operating fold rolls, work conveying means arranged to present a sheet to said rolls, a plurality of travelling guide members, a guideway for said guide members having a part thereof inclined to the longitudinal axes of said rolls and leading tothe bite. of the latter, and means fory moving said guide members in a continuous train along said guideway so that a number of said guide members successively engage the presented sheet and deflect it into the bite of said rolls. y l

l0. In a machine for folding sheets, a fold unit comprising co-operating fold rolls, work conveying means to progress a sheet longitudinally of said rolls, a plurality of travelling guide members, a guideway having some part thereof inclined to the longitudinal axes of said rolls and lying in a plane which passes through the bite of said rolls, and means for moving said guide members in' a continuous train along said vguideway so that a number of said guide members-successively engage the sheet and deflect it into the bite of said 1'0 S.

A 11. In a machine for folding sheets, a fold unit comprising co-operating fold rolls, a guideway having a part'thereof inclined'to the longitudinal axes of said rolls and leading to the bite of the latter, a train of guide members positioned along said guideway in abutting relation, and means for positively displacing each guide member in turn to shunt said abutting guide members along said guideway in a continuous path of movement so that a number of said guide members successively engage the presented sheet and .deflect it into the bite of said rolls.

12. In a sheet-folding machine, a fold vunit as claimed in claim 10 which includes at least one runway associated with the guideway, and bearing members mounted upon the guldemembers so as to travel along said runway.

13. In a machine for folding sheets, a fold unit comprising co-operating fold rolls, work conveying means arranged to present a sheet to said rolls, at least vone guide member arranged to move along a path inclined to the longitudinal axes of said rolls and leading to the bite thereof, means for moving said guide member so as to engage the presented sheet and deect it into the bite of said rolls. and means for adjusting the position of said guide member relatively to said rolls and the work presented thereto.v

14. In a machine for folding sheets, a fold unit comprising cio-operating fold rolls, work conveying means arranged to present a sheet to said rolls, a' work stop associated with said rolls to register said work in favpredetermined position relative to said rolls, at least one travelling guide member arranged to move along a path inclined 'to the longitudinal axes of said rolls and leading ing means arranged to convey a sheet longitudinally of .said rolls, an adjustable work stop associated withsaid rolls to register the sheet in a predetermined folding position relative to said rolls, at least one travelling guide member arranged to move along a path inclined to the longitudinal axes of said rolls and lying in a plane which passes through the bite thereof, and means for moving said guide member to-engage the registered sheet and deilect it into the bite of said rolls.

16. In a sheet folding machine, a fold unit comprising co-operating fold rolls, continuous conveyor tapes arranged to travel longitudinally of said rolls to present the work thereto, at least e one travelling guide member arranged to move along apath inclined to the longitudinal axes of said rolls and lying in' a plane which passes through the bite thereof, and means for moving said guide member along said path to engage the sheet carried. upon said tapes and deect it into the bite of said rolls.

1'7. In a sheet folding machine, a fold unit comprising co-operating fold rolls, continuous conveyor tapes having sheet carrying stretches extending parallel with said rolls, means for driving said tapes so that a sheet laid thereon is presented to said rolls, at least one travelling guide member arranged to move along a path inclined to the longitudinal stretches said tapes and lying in a plane which passes through the bite of said rolls, and means for moving said guide member along said path to engage the sheet carried upon said tapes and deect it into the bite of said rollers.

lso that asheet placed thereon is carried to said rolls,v at least one travellingzguide member ar ranged to move along a path inclined both to said tapes and to the longitudinal axes of said rolls and lying in a plane which passes through the bite of the latter, andA means for moving said guide member along said path to engage the sheet carried upon said tapes and deflect it into the ,bite 'of said rolls.

- rality of guide members arranged'to move in at continuous path part of which is inclined to the, longitudinal axes of said rollsand lies` in a plane which passes through the bite thereof, continuous conveyor tapes arranged to travel between said rolls and said guide members to present the sheet to said rolls, said tapes being inclined to said rolls, and means for moving said -guide members to engage the sheet carried upon said tapes and deflect it-into the bite of said rolls. y i

r24). In awmachinefor folding sheets, 'a fold unitcOmprising co-ioperating fold rolls, work. conveying means arranged to present asheet to said rolls, a scoringY device arrangedVv tooscorei said sheet along the line of the intended fold, a f travelling guidemember arranged to move along a path inclined to the longitudinal axes of said rolls and lying in a .plane which passes through the bite'of said rolls,and means-*for moving said, guide member alongv saidpath toengage the presented .sheet and deflect the lscored portion thereofl into the bite of said rolls.-

2l. In a sheet folding machine, a foldunit as said rolls. f

y forth.

claimed in claim 20, including at least one runner disc arranged to enter the groove scored in said sheet as the latter is moved towards the fold rolls. l

22. In a machine for folding sheets, a fold unit comprising co-operating fold rolls, work conveying means arranged to present a sheet to said rolls, a structure extending longitudinally of said rolls and having a continuous runway channel and continuous guideway channel formed therein, means for supporting said structureso that some part of said guideway channel lies at an inclination to the longitudinal axes of said rolls and in a plane which passes through the bite of said rolls, a train of guide members arranged in abutting relation in said guideway channel, bearing members secured to said guide members and arranged to run along said runway channel, driving means for moving said guide members along said guideway so that a number of said guide members engage the presented sheet -and deflect it into -the bite of said rolls, and means for adjusting said structure supporting means so that the position of said strucveying means may be varied as desired.

23. A machine for folding sheets which in' cludes a parallel fold section provided with means for imparting at least one fold to a sheet fed thereto, across fold section arranged to receive vand cross-fold the folded sheets delivered from parallel fold section to said cross fold roll section, and means for moving said guide member along-saidpath to engage the parallel folded sheet during the feed thereof to said cross fold rolls, so as to deect said sheetinto the biteof 24. In asheet folding machine, a fold unit as 'claimed in claim 1 in which the cca-operating fold rolls are frustro-'conical for the purpose set 25. A machine for folding sheets which includes a parallel fold section provided with means for imparting at least one fold to a sheet fed thereto, a cross fold section arranged to receive and cross fold the folded sheets delivered from said parallel section, said cross fold section comprising co-operating -fold rolls, a plurality of travelling guide members arranged to move along a-contin'uous path part of which-is inclined to the longitudinal axes of said rolls and lies in a plane passing through the bite thereof, continuous conveyor tapes arranged between said parallel fold and cross' fold sections to convey tapes to control the sheet laid upon the latter.

means" for driving said tapes, meansz'for'moving Y said guide members along said path to engage the parallel folded sheet during the feed thereof to said cross fold rolls, -so as to deect said sheet into the bite of said rolls, and means for adjusting the operative position of said guide members relative to said cross fold rolls and said conveyor tapes. Y

OstlARV Kimm.

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