Abstract: A chopper folder for a rotary press folds signatures which are periodically conveyed, one signature at a time, from a folding machine. The chopper folder includes a pair of folding rollers for folding a signature parallel to the conveyance direction, a prime mover, a crank arm fixed to an output shaft of the prime mover to be rotated together with the output shaft, a blade holder connected to the crank arm via a link, a chopper blade held in the blade holder and adapted to push the signature from an upper surface thereof in order to insert the signature into a space between the pair of folding rollers, and guide units for restricting motion of the blade holder such that the blade holder reciprocates only in a direction perpendicular to a conveyance plane along which the signature is conveyed.

Abstract: A roller arrangement for booklet makers comprises at least a first (1) and a second (2) pair of rotatably driven rollers, between which booklets (4) are intended to pass successively for folding. The first pair of rollers comprises two rollers (1) that are arranged such that they can move towards and away from each other and having a spring loading towards each other, while the second pair of rollers (2) comprises two rollers with a mutual separation that can be adjusted. Mechanical means (3) are arranged to, following the insertion of a booklet between the rollers of the first pair of rollers, automatically adjust the mutual separation of the rollers of the second pair of rollers depending on the distance between the rollers of the first pair of rollers.

Abstract: A web folding machine for folding a continuously fed web into folded segments is disclosed. The machine includes a frame upon which the other components of the machine are mounted. A web supply provides continuous web material to these other components of the machine, with multiple feeds of the web material being processed in parallel relationship to one another. In one embodiment of the invention, web is pulled from a web supply by a pull roll station, which engages the web material to feed it at an approximately constant feed rate to a metering roll station. After proceeding through the metering roll station, the web reaches the folding station, where the web it is folded into a folded segment. In yet another embodiment of the invention, the web is first fed to a folding board that folds the web longitudinally. After the web is folded longitudinally by the folding board, it is fed to a pivoting marker web guide station that periodically pivots to vertically displace the web to create a marker.

Abstract: In a booklet maker or sheet folder wherein one or more sheets are pushed through a nip formed by a pair of crease rolls, a pair of flexible gate members cover the nip while sheets to be folded are being loaded. When the sheets are pushed through the nip, the flexible gate members are displaced, allowing the nip to receive the sheets. Following feeding of the sheets, the flexible gate members spring back to a closed position.

Abstract: An apparatus for folding sheet material, including a fold blade having a rounded folding surface, a fold roller, and drive means for moving at least one of the fold blade and the fold roller into operable communication such that the fold roller passes around or along the rounded folding surface.

Abstract: The folding machine with a collect run mode of this invention comprises folding cylinder fixed cam means for carrying out a straight run at pins, folding cylinder rotating cam means provided with covering section so as to enable rotation of the covering sections for covering a cam shape for carrying out the straight run, jaw cylinder fixed cam means for carrying out a straight run at jaw mechanisms, jaw cylinder rotating cam means provided with covering sections to enable rotation of the covering sections covering a cam shape for carrying out a straight run, drive transmission means for ensuring that the covering sections of the folding cylinder rotating cam means rotate at a predetermined rotational speed ratio with respect to rotation of the folding cylinder and that the covering sections of the jaw cylinder rotating cam means rotate at a predetermined rotational speed ratio with respect to rotation of the jaw cylinder, and switching means for switching over driving between the folding cylinder rotating cam

Abstract: Here is disclosed a method and apparatus for folding a continuously fed in two. The web is folded along guide means defining a folding guide line with a fold angle gradually reduced. In the course of gradually reducing the fold angle, a plurality of guide rolls through are pressed against transversely opposite side edge portions of the web. Immediately before the stage on which the web is completely folded in two, there are provided detector means adapted to detect actual positions of the respective side edge portions and swing rolls located upstream of these detector means adapted to change a crossing angle of the web with respect to a machine direction. Actuators interposed between the detector means and the swing guide rolls cause the swing guide rolls to swing and thereby to move the side edge portions toward predetermined positions.

Abstract: A folding cylinder includes a plurality of gripping devices supported on a first rotatable support with a first gripping device for holding a signature on the cylinder. A plurality of tucking devices are supported on a second rotatable support, the tucking devices including a first tucking device and a second tucking device. The first gripping device is located circumferentially between the first tucking device and second tucking device and a cover fixed to the second rotatable support extends circumferentially over the first gripping device between the first tucking device and the second tucking device. The cover has at least one aperture, with the first gripping device capable of extending through the at least one aperture. With the folding cylinder of the invention gaps between the tucking and gripping spiders can be eliminated.

Abstract: A jaw cylinder has sets of fixed and movable jaws arranged at circumferential spacings thereon for folding the printed sheets into signatures as the sheets are thrust into the jaw cavities by folding blades on a folding cylinder. The movable jaws are mounted fast on respective jaw carrier shafts for pivotal motion into and out of engagement with the fixed jaws. For such pivotal motion of the movable jaws, the jaw carrier shafts are engaged via cam followers with a jaw drive cam of annular shape mounted to the frame, so that the movable jaws successively pivot toward and away from the fixed jaws upon rotation of the jaw cylinder. A timing screw acts between the jaw drive cam and the frame to cause angular displacement of the former relative to the latter about the axis of the jaw cylinder, in order to time the opening and closing of all the sets of jaws to the thrusting of the sheets off the surface of the folding cylinder by the folding blades.

Abstract: A folding blade cylinder for use in a folding machine includes a cylindrical cradle and a folding blade that can be situated in various positions in the cylindrical cradle. Each position of the folding blade corresponds to a gap in the cylinder cradle surface. These gaps are separated from ach other by segments of the cylindrical cradle. In order to move the folding blade from one gap to another, the folding blade is retracted into the interior of the folding blade cylinder.

Abstract: The side walls of a folder unit are embodied with opposed recesses. Additional processing elements, which enhance the variability of the folder unit, can be introduced into the recesses. It is especially advantageous in the recesses of the side walls of the folder unit to provide a processing element which is supported pivotably and has a delivery roller.

Abstract: A sheet post-processing apparatus includes a pair of folding rollers for folding a transported sheet stack by rotation while nipping the sheet stack, a pushing plate for pushing the transported sheet stack into the folding rollers by advancing and retreating relative to the folding rollers, a stack transport upper roller and a stack transport lower roller (first load device) for applying a load to the pushing plate in pushing the sheet stack by contacting the sheet stack at an upstream side of the folding rollers, and sheet holding mechanism (second load device) having a lever for applying a load to the pushing plate in pushing the sheet stack by contacting the sheet stack at the downstream side of the folding rollers. An image forming apparatus is equipped with the sheet post-processing apparatus.

Abstract: A folding cylinder includes a plurality of gripping devices supported on a first rotatable support with a first gripping device for holding a signature on the cylinder. A plurality of tucking devices are supported on a second rotatable support, the tucking devices including a first tucking device and a second tucking device. The first gripping device is located circumferentially between the first tucking device and second tucking device and a cover fixed to the second rotatable support extends circumferentially over the first gripping device between the first tucking device and the second tucking device. The cover has at least one aperture, with the first gripping device capable of extending through the at least one aperture. With the folding cylinder of the invention gaps between the tucking and gripping spiders can be eliminated.

Abstract: A system (10) for producing folded articles includes a cutting station (58) operable to segment a fabric web (42) into a continuous stream of individual web segments (86). The system also includes a rotary folder (96) comprising a plurality of folding rollers (104, 106). The rotary folder (96) rotates about an axis spaced apart from axes of the folding rollers (104, 106). The rotary folder (96) is operable to receive the web segments (86) at a first location and fold the web segments one or more times while rotating from the first location to a second location about the rotary folder (96) axis. The system further includes a transfer station (62) operable to receive the folded web segments (86) from the rotary folder (96) at the second location and deliver the folded web segments (86) to a third location.

Abstract: A sheet folding apparatus, which may be used in conjunction with a printer or copier, includes a set of rollers forming a buckle zone, in which sheets are caused to buckle for creasing by a folding nip formed by the rollers. A blade is selectably positionable in and out of the buckle zone. When the blade is positioned in the buckle zone, any previously-folded portion of the sheet (such as in C-folding of the sheet) is prevented from being drawn away from the folding nip.

Abstract: A corrugating roll design for a corrugating machine including a pair of parallel, spaced apart, corrugating rolls which rotate in opposite directions on their respective rotational axes, the rotational axes being spaced apart a predetermined distance, and each of the corrugating rolls being formed along its outer peripheral surface with longitudinally extending teeth with tooth tips and tooth roots. Depressions are provided in the tops of the tooth tips of at least one of the corrugating rolls and spaced apart a predetermined distance along the length of the roll. Each of the depressions has a bottom surface which is located to establish a spacing between the bottom surface of the depression and the tooth root of the other corrugating roll at the actual corrugation impression zone in the nip, which spacing is greater than the thickness of the paper medium.

Abstract: The invention provides a table top folding apparatus that is easily reconfigured to provide a single fold folding apparatus or a multi-fold folding apparatus. The apparatus includes a frame, having first and second roller pairs and a first fold table and a second fold table positioned to receive material from the respective roller pairs. The apparatus also includes a fold selector assembly rotatably attached to the frame, the assembly including a diverter and a stop fence. The fold selector assembly is adjustable by a single actuation arm to rotate between a single fold position and a double fold position. The invention further provides a tabletop folding apparatus having independently adjustable fold selector and material diverter assemblies.

Abstract: A low-oscillation and space-saving drive for a changeable format folder of a rotary printing is provided, the rotary printing machine having rotating subassemblies that can be driven, in particular a cutting cylinder, a pin folding blade cylinder, a folding jaw cylinder, a gripper folding blade cylinder, and perforating cylinders belonging to a perforating device. The drive is split up into individual subsystems, and each subsystem is assigned a controlled-position drive motor. In the event of failure of a drive motor, the drive continues to operate without functional impairment.

Abstract: The present invention is directed generally to a folder apparatus for sheets, and more particularly a folder with a fold path transverse to a feed path. In an embodiment, the folder comprises a channel for receiving a sheet, feed rollers for feeding the sheet along the feed path and through the channel, the feed rollers are axially aligned with the feed path, guide rollers positioned transverse to the feed path for feeding the sheet along a fold path to pinch rollers which pinch the sheet to form folds. The paper path does not reverse and the folding action is smooth so that noise and vibration are reduced. Also, the folder has a smaller footprint than other folders.

Abstract: An apparatus and method for automatically folding a sheet of media, for example, a photographic paper about a fold line, such that a album page is formed. The photosensitive media has images only on one side. A heat activated adhesive sheet is provided between the sides of the photographic paper during folding. The adhesive sheet when exposed to heated and pressure rollers, will cause the sides of the photographic media to be secured to form a single album page.

Abstract: A rotary blade folder includes two fold rollers and a folding cylinder, the folding cylinder including a cylinder body with an outer surface, a set of tucking blades and an expansion plate adjustable to change an effective diameter of the folding cylinder. The expansion plate has at least one aperture, the set of tucking blades fitting through the at least one aperture during a tucking operation so as to present a fold in a signature to the two fold rollers. Also provided is a method of folding a signature comprising the steps of gripping a signature about a folding cylinder so that the signature is over an expansion plate of the folding cylinder, the expansion plate having at least one aperture, and folding the signature by passing tucking blades through the at least one aperture.

Abstract: A sheet finishing method in which a sheet delivered from an image forming apparatus main body is conveyed and stacked on a sheet placement table, and the stacked sheets are positioned and aligned, and then folded by a folding means composed of a paired folding rollers and a folding plate. The sheet finishing method is controlled such that a rotation motion of the paired folding rollers is switched between a state to be rotated along with an advancing motion of the folding plate and a state to be stopped in accordance with the number of sheets stacked on the sheet placement table.

Abstract: The cylinder includes first and second cylinder parts which are designed to be rotatable in relation to one another in the circumferential direction and are fitted with respective first and second operating elements for acting on a foldable product. The first cylinder part is mounted non-rotatably on a shaft and of the second cylinder part is mounted on the shaft rotatably in the circumferential direction. The shaft is mounted at one end, fixed axially, in a side wall in a bearing designed as a fixed bearing. The second cylinder part is mounted separately, with a spacing (A) from the first cylinder part, in a second fixed bearing which is independent of the first bearing.

Abstract: An apparatus for folding sheet material, including a fold blade, two fold rollers, a pinch foot for clamping against the fold blade, and drive means for moving at least one of the fold blade and the fold rollers into operable communication with one another, where each of the fold rollers rotates about an axis parallel to a longitudinal axis of the fold blade.

Abstract: A device is provided for folding a material web traveling in a machine direction. The device has a folding portion having a leading edge, a breaking wing attached to the folding portion, the breaking wing having a breaking edge, and a roller rotatably attached to the breaking wing and having a surface and a rotational axis. The rotational axis is along a transverse direction, the transverse direction being substantially perpendicular to the machine direction. The roller is for supporting a roller portion of the material web as the material web is fed to the folding portion, and the breaking wing is for supporting a wing portion of the material web as the material web is fed to the folding portion. The surface of the roller is positioned in the transverse direction at a first angle relative to the rotational axis, the breaking edge of the breaking wing is positioned in the transverse direction at a second angle relative to the rotational axis, and the first angle is different from the second angle.

Abstract: The present invention is directed generally to a folder apparatus for sheets, and more particularly a folder with a fold path transverse to a feed path. In an embodiment, the folder comprises a channel for receiving a sheet, feed rollers for feeding the sheet along the feed path and through the channel, the feed rollers are axially aligned with the feed path, guide rollers positioned transverse to the feed path for feeding the sheet along a fold path to pinch rollers which pinch the sheet to form folds. The paper path does not reverse and the folding action is smooth so that noise and vibration are reduced. Also, the folder has a smaller footprint than other folders.

Abstract: A system for folding sheet material, including a fold blade, a fold roller, and a driver for moving at least one of the fold blade and the fold roller along a first path into operative communication with one another. The operative communication causes displacement of the fold roller along a longitudinal axis of the fold blade.

Abstract: A continuous web of printed paper is cut by a cutting cylinder into discrete sheets on being wrapped around part of a folding cylinder. The folding cylinder has sets of the folding blade in the cavity each aligned parallel to the cylinder axis and all arranged at constant circumferential spacings. Each folding blade is movable radially of the folding cylinder for pushing one sheet of printed paper off the cylinder surface in the middle of the sheet. Disposed opposite the folding cylinder, a jaw cylinder has cavities opening to its surface at constant circumferential spacings, each for receiving the midpart of the sheet being pushed by the folding blade in the cavity. Each cavity has a movable jaw arranged therein for pivotal motion toward and away from a fixed jaw in order to crease the sheet. An indentation is formed in the fixed jaw so as to be in opposed relationship to the insert part of the folding blade on the folding cylinder in the cavity as the folding blade is inserted in the cavity with the sheet.

Abstract: A device for folding printing copies in a web-fed rotary printing machine includes a folding knife, controls for reciprocatingly moving the folding knife at least approximately in one plane, the controls including a first and a second toggle lever, which, at one of the ends thereof, respectively, are movably attached to frame-fixed parts of the printing machine and at the other ends thereof, respectively, are movably attached to the folding knife, and a rotary element simultaneously actable upon both the first and the second toggle levers for operating the controls; a folder including the folding device; and an assembly including the folder with the folding device.

Abstract: A method and apparatus for forming informationbal items such as outserts and booklets may include folding a sheet of paper having product information printed thereon by making a plurality of folds in the sheet of paper to form a first folded article, the folds in the sheet of paper being made using a first folding apparatus having a plurality of folding rollers; (b) making a fold in the first folded article to form a second folded article, the fold being parallel to a second direction perpendicular to the first direction, the fold being made using a second folding apparatus having a plurality of folding rollers; (c) applying pressure at least about 30 psi and no greater than about 500 psi to the second folded article a first pressing unit having a pair of pressure rollers; and (d) making one or more folds in the second folded article to form an outsert using a third folding apparatus having a plurality of folding rollers having a nip therebetween and a movable blade member, the movable blade member making con

Abstract: The folding device of a folding machine, which can perform parallel double folding and delta folding, and which can smoothly and reliably transfer a parallel single-folded signature between first and second jaw cylinders regardless of paper quality. A first jaw cylinder and a second jaw cylinder arranged with circumferential surfaces thereof opposed to and in contact with each other. At least one belt is looped between the first jaw cylinder and a set of rollers, and wherein one of the rollers is moved to switch the belt between a guide position and a retreat position.

Abstract: A folding mechanism couples to a printing mechanism and receives media for folding therein.

Abstract: A folder in a signature-processing machine has a transfer cylinder and a folding cylinder. The two cylinders are mounted to be rotatable in relative counter-rotation at a substantially equal peripheral speed. They form a nip through which a signature is transported. The signature is taken up by the folding cylinder at a folding location between its leading edge and its trailing edge. In order to reduce the formation of dog-ears and crumpling when the signature tail is ripped away from the transfer cylinder, there is provided a fold-off guide at the exit side of said nip. In order to adapt for speed changes of the folder, and to allow for the fold-off guide to change its shape in synchronicity with each signature, the fold-off surface of the guide is movably disposed. The fold-off guide, in a simple embodiment, may be a flexible plate. In a dynamically varying embodiment, the fold-off guide may be cam or an eccentric with or without the intermediary of an endless belt which travels with the folding cylinder.

Abstract: A machine for cutting and folding sheets of aluminum foil dispensed from a roll. The machine comprises means for mounting a roll of aluminum foil so that aluminum foil can be advanced through the machine. Two adjacent rollers can be electrically driven to advance aluminum foil by frictional force from the roll. The machine further comprises a knife mechanism for cutting off a sheet of aluminum foil after it has passed between the rollers and means for folding an edge of a cut sheet produced by the knife mechanism. A control unit for controlling the knife mechanism ensures that the aluminum foil is cut only during predetermined intervals.

Abstract: The device for rotary converting a web or sheet matter equips a processing station arranged in a machine (2) particularly producing packagings by means of cylindrical tools (10, 11). These tools are arranged in a cassette (7) and rotated by a driving device (40) equipped with a motor (42). The cassette (7), coming from an extrinsic equipment to that which normally equips the machine (2), is placed in another so-called adaptive cassette (20), which is removable and secured to the driving device (40). The latter is arranged on the adaptive cassette (20).

Abstract: The present invention is directed generally to a folder apparatus for sheets, and more particularly an improved knife folder. In an embodiment, the folder comprises an inducer which is repositionable between a first position and second position, and an idler roller. In the first position the idler roller and a fold roller form a nip. The inducer further comprises a blade adjacent to the idler roller. A first side of the blade and another fold roller define a portion of the feed path adjacent to the another fold roller. When the inducer is in a second position an auxiliary feed path is formed and the sheet may travel along the auxiliary feed path and subsequently be buckled by the blade when the inducer returns to the first position.

Abstract: Sheet media is folded in a folding apparatus. The apparatus has an input conveyor, first and second pairs of positioning rollers, first and second folding mechanisms, and first and second media paths. The media is conveyed into the apparatus with the input conveyor. The input conveyor may be a pair of input rollers or any other type of media conveyor. The media is buckled by capturing and positioning the media with a first pair of positioning rollers, while the media is conveyed with the input conveyor. The buckle in the media is captured with the first folding mechanism and drawn from the input conveyor and the first pair of positioning rollers. The first folding mechanism may be a pair of folding rollers or any other mechanism for capturing a buckle in the media. The media is buckled again by capturing and positioning the media with the second pair of positioning rollers, while the media is drawn by the first folding mechanism.

Abstract: A sheet folding method has the first introduction process to introduce a sheet between the first rotary folding body and the first rotary pressure-contact body, and between the second rotary folding body and the second rotary pressure-contact body, respectively; the first folding process in which, under the condition that the first and second rotary folding bodies are in contact with the first and second rotary pressure-contact bodies, respectively, and rotated in the reversal direction to each other, thereby the conveying force of reversal directions to each other is acted and the sheet is bent and a fold is formed, and the fold of the sheet is conveyed between the first and second rotary folding bodies thereby the sheet is folded; the second introduction process to introduce the sheet folded by the first folding process using the similar structure to the first introduction process; and the second folding process using the similar steps to the first folding process.

Abstract: An apparatus and method for automatically folding a sheet of a media, for example a photographic paper, about a fold line such that a album page is formed. The photosensitive media has images only on one side. A heat activated adhesive sheet is provided between the sides of the photographic paper during folding. The adhesive sheet when exposed to heated and pressure rollers will cause the sides of the photographic media to be secured to form a single album page.

Abstract: A method of folding pants is suitable for use with discrete articles including mechanical fastening components and suitable for the manufacture of prefastened and refastenable pants. The discrete articles define leading and trailing halves with opposed side panels. The leading side panels can be maintained separate from the trailing side panels during folding and until the discrete articles are downstream of a folding nip.

Abstract: There is disclosed a method and apparatus for making a looped label and accumulating labels in a stack. An intermediate portion of the label is inserted into the nip of a pair of rotating rolls which fold or loop the label into two side-by-side or face-to-face label portions. The looped label is transported between the nip of a pair of pressing rolls which press or iron the label at the fold line while the label is stationary between the rolls to maintain the label in the folded condition. From there the label is passed into a stacker in which successively looped labels are stacked.

Abstract: An on-the-fly cut sheet folder has a pinch feeding conveyor for pinch feeding a medial panel of a cut sheet in order to feed the sheet in a downstream direction. A fold up plough extends along one side of the pinch feeding conveyor and a fold down plough extends along the other side of the conveyor. A folded sheet conveyor extends below and downstream of the pinch feeding conveyor. The ploughs extend beyond the downstream end of the pinch feeding conveyor and toward the folded sheet conveyor in order to guide sheets folded by the ploughs onto the downstream conveyor.

Abstract: A printing press having a jaw mode assembly and a rotary mode assembly with a single folding cylinder adapted to feed either the jaw mode assembly or the rotary mode assembly is disclosed. A moving web of material is initially trained about the folding cylinder and cut into a signatures which are then temporarily held on the folding cylinder. A folding blade extends from the folding cylinder to initiate a fold in each signature and direct each signature to either the jaw mode assembly or the rotary mode assembly. The timing of the folding blade is coordinated and adjusted using an indexable spider assembly to feed either the jaw mode assembly or the rotary mode assembly.

Abstract: The present invention is related to a paper conducting cylinder in a folder which is assigned to a rotary printing press such as a rotary newspaper printing press. A plurality of cylinder's surface sections (19) is mounted about the circumference of said cylinder (8). Each of said surface sections (19) being of layered structure comprises a compressible material (24) adhesively attached thereto. Said surface sections (19) are removably secured to mounting surfaces (29) of said cylinder (8), preferably on its side walls.

Abstract: Signatures that are cross-folded to form cross folded products can be formed without damaging the product whether the cross-folded product is thick or thin. The signatures are given a pre-fold by a pre-fold cylinder that utilizes a plurality of pre-fold gripping element systems. The pre-folded product is carried by the pre-fold cylinder to a pair of folding rollers which finish fold the cross-folded signatures.

Abstract: An apparatus for folding and sealing a sheet having a pressure sensitive adhesive positioned thereon is disclosed. The apparatus includes a first roller and a second roller. The second roller has a roller surface, and a plurality of independent sealing protrusions extending from the roller surface. The sealing protrusions are positioned in operative contact with the first roller during advancement of the sheet between the first roller and the second roller. The apparatus yet further includes a third roller. The sealing protrusions of the second roller are positioned in operative contact with the third roller during advancement of the sheet between the second roller and the third roller. The sealing protrusions extend from the roller surface at locations such that advancement of the sheet between the second roller and the third roller causes the sealing protrusions to operatively contact the adhesive.

Abstract: The invention is an apparatus for converting sheets of paper into cushioning dunnage. The apparatus includes a supply assembly, a conversion mechanism, a cutting assembly and a cutting assembly interlock device. The supply assembly supports the paper which is to be converted. The conversion assembly crumples single ply paper into cushioning dunnage and the cutting assembly cuts the newly formed dunnage into desired lengths, where the dunnage is allowed to fall into a container to cushion an item within the container. The cutting assembly interlock device permits activation of the cutting assembly only when the cutting assembly has fully moved into the proper, cutting position.

Abstract: A folding apparatus in a rotary printing press utilizes a cutting blade cylinder, a transport cylinder and a folding jaw cylinder. Operation of the various assemblies on the transport cylinder, such as folding blades and gripper systems is accomplished by control cams and associated cam rollers. The control cams are carried on the transport cylinder and rotate in the direction of the transport cylinder and at a speed which is different from the speed of rotation of the cylinder itself. This ensures low wear of the control cams and of the cam rollers.

Abstract: A configuration for folding sheets with an increased functional reliability and field of use folds sheets of different lengths through the use of folding rolls and an adjustable stop in such a way that automatic matching of a folding gap to a thickness of a material to be folded is carried out and a folding blade and a folding pocket can be dispensed with, while executing the functions of simple folding, multiple folding, turning and smooth passage. The configuration includes folding rolls which rest against each other in a resilient manner and have a given diameter. Pressure rolls with a diameter which is smaller than half the given diameter are disposed in such a manner as to be adjustable and axially symmetrical in relation to the folding rolls. Furthermore, a stop can be adjusted into a region between the pressure rolls and at the same time is a diverting element.

Abstract: A pivotedly mounted pressure roller unit, associated with which is a folding roller pair, is arranged on the transport path of a sheet to be folded. The pressure roller unit has a first and a second roller group, having rollers offset alternatingly eccentrically with respect to one another and mounted in independently rotatable fashion, which coact with the folding rolls in such a way that simultaneously, the rollers of the first roller group can be laid nonpositively against the one folding roller, and the rollers of the other roller group against the other folding roller. The transport speed (v.sub.2) of the folding rolls can be reduced to a lower transport speed (v.sub.1), thus causing a transport roller pair driven at an unchanging transport speed to bulge the sheet into an arc prior to entry into the folding rolls. By pivoting the pressure roller unit against the folding rolls, the arc and the trailing end of the sheet are transported simultaneously by the pressure roller unit.