Abstract: A printing press having an apparatus for determining the product thickness of a folded product which is fed to folding rolls for making a fold known as the third fold. The apparatus has measuring heads that are arranged on both sides of a folding roll bearing levers. For the purpose of presetting, the product to be folded is introduced slowly between folding rolls. The position of the folding rolls is determined, and a setting signal is generated therefrom and supplied to an actuating motor via a machine presetting means. The actuating motor sets the position of the folding roll levers, such that the folding rolls can be set relative to one another with regard to their mutual spacing, in accordance with the thickness of the folded product.

Abstract: The present invention relates to a sheet processor apparatus comprising: a sheet stack portion on which a sheet is stacked; a sheet conveyance path for conveying a sheet stacked on the sheet stack portion; a sheet conveyor for conveying to the sheet conveyance path the sheet stacked on the sheet stack portion; and a sheet folding device for folding a sheet in the sheet-set conveyance path. The sheet folding device is provided in the sheet conveyance path, and at least a portion of the sheet conveyance path at which the sheet folding device is positioned is formed into a curved shape.

Abstract: This invention relates to a sheet postprocessing apparatus which includes a first crease forming unit for forming a first crease on a sheet in its width direction, a second crease forming unit for forming a second crease parallel to the first crease, a first abutting member against which the leading end of a sheet introduced into the first crease forming unit abuts to position the sheet, a second abutting member against which the first crease abuts to position the sheet, a first driving mechanism for driving the first abutting member, a second driving mechanism for driving the second abutting member, and a control device for controlling the first crease forming unit, first driving mechanism, second crease forming unit, and second driving mechanism, and makes one folding process selected from a center folding process, inward three-fold process, and Z-fold process executable in the same sheet convey path.

Abstract: A sheet post-processing device is provided with a pushing device for pushing a predetermined position of a sheet stack in a direction substantially perpendicular to a direction that the sheet stack is conveyed, and a pair of rotating bodies for performing a folding operation. In the folding operation, a position of the sheet stack pushed by the pushing device is moved away from a contact point between rotational centers of the rotating bodies.

Abstract: A finisher that is capable of accurate sheet processing but is small in size, the finisher controlling a feeder and a sheet folding unit and executing 1) an operation in which the sheet is conveyed in the first direction, and after a downstream edge thereof relative to the first direction is detected by the detector during conveyance, the sheet is conveyed in the second direction, 2) an operation in which after such sheet edge is detected by the detector during conveyance in the second direction, the conveyance of the sheet in the second direction is continued for a prescribed amount based on a sheet length along a direction of conveyance, whereupon the sheet is stopped, and 3) an operation in which after the sheet is stopped, the sheet folding unit is operated to create a fold line at a prescribed position in the sheet.

Abstract: A binding apparatus includes a receiving device configured to receive a sheet from outside and convey the sheet, and a sheet folding device configured to fold the sheet, conveyed by the receiving device, in two at a center portion thereof in a direction the sheet is conveyed, so as to be a folded sheet, and convey the folded sheet with the folded portion thereof being a leading edge of the folded sheet. A jogging device includes a jogging table and is configured to receive and jog the folded sheet, conveyed by the sheet folding device, one after another, so as to be stacked into a stack of folded sheets on the jogging table. A binding device is configured to bind the stack of folded sheets stacked on the jogging table at an edge portion of the stack of folded sheets at the side where the folded portion of each folded sheet of the stack of folded sheets is located. A discharging device is configured to discharge the bound stack of folded sheets.

Abstract: An image forming apparatus integrally having a sheet post-processing apparatus is disclosed. The apparatus includes a center folding unit for creasing, a stack unit which has an angular shape, and a pushing unit which pushes up the paper sheets stacked on said stack means. The apparatus also includes a first convey unit for conveying a creased paper sheet or the like and stacking paper sheets or the like on the stack unit. The apparatus further includes a convey assistance unit provided near a top portion the stack unit and a saddle stitching unit for forming a predetermined number of paper sheets or the like stacked into a booklet. In addition, the apparatus also includes a second convey unit for conveying the saddle-stitched booklet in a two-folded state, a cutting unit for performing a cutting process, and a discharging unit for discharging the two-folded booklet outside the apparatus.

Abstract: A folding device of the present invention includes a fold plate and a fold roller pair for folding a sheet or a sheet stack conveyed thereto. A controller causes the fold roller pair to move back and forth while nipping the folded portion of the sheet or that of the sheet stack at its nip for thereby continuously exerting pressure on the folded portion. The fold roller pair is rotated in opposite directions for thereby sharpening the fold of the sheet or that of the sheet stack.

Abstract: A system for folding sheet material is provided, including a fold blade, two fold components biased toward one another, and first drive means for moving at least one of the fold blade and the two fold components to position the fold blade between the two fold components and thereby displace the two components away from one another, where the two fold components are mounted on different support elements.

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: An apparatus for creating a pillowless booklet, comprising: a means for accumulating a plurality of sheets to form a bundle; a means for fastening said plurality of sheets in said bundle operatively connected to said accumulating means; a means for forming a booklet spine edge operatively connected to said fastening means; and a means for flattening said booklet spine edge in order to create a pillowless booklet operatively connected to said booklet spine forming means, comprising; a crease wire; a crease roller located substantially adjacent to said crease wire; a guide operatively connected to said crease roller; a carriage roller operatively connected to said guide rail; and a clamp operatively connected to said guide rail.

Abstract: A binding apparatus includes a receiving device configured to receive a sheet from outside and convey the sheet, and a sheet folding device configured to fold the sheet, conveyed by the receiving device, in two at a center portion thereof in a direction the sheet is conveyed, so as to be a folded sheet, and convey the folded sheet with the folded portion thereof being a leading edge of the folded sheet. A jogging device includes a jogging table and is configured to receive and jog the folded sheet, conveyed by the sheet folding device, one after another, so as to be stacked into a stack of folded sheets on the jogging table. A binding device is configured to bind the stack of folded sheets stacked on the jogging table at an edge portion of the stack of folded sheets at the side where the folded portion of each folded sheet of the stack of folded sheets is located. A discharging device is configured to discharge the bound stack of folded sheets.

Abstract: An outsert-forming apparatus and method that forms outserts and booklets having printed product information thereon. The apparatus may comprise a first folding unit that forms a first folded article from a sheet of paper having printed information thereon, a second folding unit that forms a second folded article from the first folded article, a first detector positioned to detect the second folded article, an adhesive applicator positioned to apply adhesive to the second folded article, a second detector positioned to detect the adhesive applied to the second folded article, and a controller operatively coupled to the first detector, the second detector and the adhesive applicator.

Abstract: A folding/stitching apparatus (1) includes a sheet setting tray (3) having a slit (7), on which a plurality of superimposed sheets (P1) are set, a folding/stitching plate (16) provided to be freely moved between a standby position for not entering the slit (7) of the sheet setting tray (3) and a folding/stitching position for entering the slit (7) and having a staple bending portion (19) provided in an insertion tip into the slit (7), and a stapler (20) pressed into contact through the sheets (P1) with the folding/stitching plate 16 set in a folding/stitching position to stick staples into the sheets (P1). The folding/stitching plate (16) is moved between the standby position and the folding/stitching position in conjunction with an operation of a handle (12).

Abstract: A binding apparatus includes a receiving device configured to receive a sheet from outside and convey the sheet, and a sheet folding device configured to fold the sheet, conveyed by the receiving device, in two at a center portion thereof in a direction the sheet is conveyed, so as to be a folded sheet, and convey the folded sheet with the folded portion thereof being a leading edge of the folded sheet. A jogging device includes a jogging table and is configured to receive and jog the folded sheet, conveyed by the sheet folding device, one after another, so as to be stacked into a stack of folded sheets on the jogging table. A binding device is configured to bind the stack of folded sheets stacked on the jogging table at an edge portion of the stack of folded sheets at the side where the folded portion of each folded sheet of the stack of folded sheets is located. A discharging device is configured to discharge the bound stack of folded sheets.

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: A cushioning conversion machine (20) including a conversion assembly (30) which converts a continuous sheet of multi-ply stock material (22) into a three dimensional cushioning product (32) and a stock supply assembly (550) which supplies the multi-ply stock material (22) to the conversion assembly (30). The conversion assembly (30) includes a forming assembly (52) which inwardly turns lateral portions of the stock material (22) as the stock material (22) travels therethrough in a downstream direction. The stock supply assembly (550) includes a separating device (574) and/or constant-entry device (580) designed to minimize tearing due to excessive tension in the lateral regions of the stock material (22). Additionally or alternatively, the forming assembly (52) includes a shaping member (590) having protrusions in its turning perimeter and/or holding surface to modify the shape of the cushioning product.

Abstract: In a sheet bundle folding apparatus for folding a bundle of sheets in two, a stick-out plate for sticking the bundle of sheets is adapted to reliably stick the bundle of sheets folded while being held between rollers for folding the bundle of sheets in a folding position therefor. A first folding roller is positionally fixed. A second folding roller is movable toward and away from the first folding roller. The stick-out plate sticks the bundle of sheets and pushes it into between the first and second folding rollers. At this time, the rollers of the stick-out plate roll along a groove. The forward roller is fitted in the groove with a correction allowance above it, and is downwardly biased by a spring. The stick-out plate follows the folding position for the bundle of sheets.

Abstract: This invention relates to a sheet processing apparatus for stapling multiple sheets with a stapling means and delivering the sheets in folio, comprising two rollers for folding the sheets in folio and projecting means for projecting between the two rollers to fold the sheets in sandwiching the sheets between the two rollers. One roller of the two rollers, at least, is made movable, and a cam member is further provided capable of correcting a projecting position by the projecting means according to traveling of the roller.

Abstract: A finisher including a tray to enable the stacking of sheets; a leading end stopper, which projects from an upper surface of the tray, to contact and align an end face of a sheaf of sheets stacked in the tray; and a sheaf-conveying device, having a pair of rollers, to selectively nip (or engage) and convey a sheaf of sheets from the tray. Following an engagement by the sheaf-conveying device, the rollers are severally rotated to evenly convey an engaged sheaf of sheets while better protecting the alignment and appearance of such sheaf.

Abstract: A knife folder for folding a sheet material comprises a sheet-material feeder for feeding the sheet material in a first direction, a folder for folding said sheet material, and a sheet-material conveyer used for conveying the sheet material and comprising at least one pair of rotating conveying components whose axes of rotation are arranged in a second direction substantially at right angles to the first direction. The folder pushes the folded sheet material between the conveying components of the at least one pair of conveying components when it is at its folding position. The sheet material is advanced up to a stop. The folder comprises a knife extending in a third direction substantially at right angles to said first and said second direction. The sheet material can be conveyed in the third direction by actuating the conveying components.

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: An automatic machine for folding long sheets having first and second oscillating blades operating in a transverse motion to create alternate creases in a vertically descending sheet between a first and second upper folding rollers opposing respective first and second lower folding rollers that are rotatable with a predetermined reciprocating synchronous movement, said first and second oscillating blades being arranged to insert said sheet between said folding rollers to form folds in the sheet, whereby the folded sheet is directed towards an underlying collection shelf wherein said upper folding rollers being driven with rapid-reversal or pulse-reversal rotation by a linkage which moves them in the same direction by virtue of their connection by a toothed drive belt, engaged about their toothed end pulleys which are rotatably free, but which can be individually and alternately fixed to a shaft of their own respective roller following the operation of an electromagnetic clutch, said first upper folding roller

Abstract: A device for accurately setting a roller gap of a folding device of a rotary web-fed press uses a rotatable threaded spindle with contrarotating threads at both of its ends. A drivable differential screw gear mechanism is associated with each threaded spindle end and operates to pivot two-armed levers that support the folding rollers to thus vary the roller gap.

Abstract: A paper stacker for use with a printer which prints connected sheets that are to be stacked in a folded relationship having a surface for receiving the paper with a frame surrounding the paper that is raised in relationship to the paper in order to maintain paper within the confines of the frame as the frame moves upwardly. The frame is balanced by a constant force spring, and is indexed by optical sensors. The frame includes two adjustable fences for variously sized paper which adjustably moves with paddles to press the paper edges downwardly in the stack. Pinch rollers for driving the paper include low inertia drive rollers formed of a relatively low density plastic material with a pair of idler rollers. To improve stacking, ironing tractor idler rollers iron the tractor perforations, and chains orient the catenary stacking movement.

Abstract: A sheet bundle folding apparatus causes a bundle of sheets to be rolled into a pair of fold rollers thereby folding the bundle of sheets. The apparatus is provided with a drive source for rotating the pair of fold rollers in a normal direction to roll in the bundle of sheets and in a reverse direction to return the rolled-in bundle of sheets.

Abstract: A sock processing apparatus provides devices for folding, trimming, stacking, and compressing socks. The method provides folding socks by tucking them into a slot in a plate, closing a pair of rollers beneath the plate upon the socks, and thereafter pulling the socks through the slot under roller compression. The socks then move to a trimming station, where they are held in place while a trimmer removes excess threads. The socks are then stacked and moved to a compression station for compression prior to packaging.

Abstract: Pre-folding rollers and pinch rollers (1, 2 3, and 4) of identical diameter are arranged one behind the other in the folding direction (A) and rotatably mounted between two plates (5). A second pre-folding roller (2) and a second pinch roller (4) are stationarily and rotatably mounted on the plate (5). The first pre-folding roller (1) is rotatably mounted at both its ends with its bearings (1a) on lever arms (6) pivotably arranged on the plates (5). Connecting arms (7) are linked to the bearings (1a), on which arms the second pinch roller (3) is rotatably mounted on bearings (3a). The connecting arms (7) are loaded by springs (13) transverse to a folding direction and are in contact with fixed stops (8a and 10 respectively). The stops (8a and 10) are so positioned that the pre-folding and pinch rollers (1, 2 3, and 4) do not touch, so that the bearings (1a, 2a, 3a, and 4a respectively) are not subjected to load while no folding is in progress.

Abstract: An apparatus for producing printed products comprising one or more individual sub-products, e.g. newspapers, periodicals and the like. The apparatus comprises a rotating drum or drawing member having a plurality of successive receiving positions. The drum or drawing member is arranged between at least one sub-product feeding station and at least one sub-product removal station. The individual receiving positions each comprise at least one folding device and each folding device comprises a pair of folding rollers and a folding tongue which moves between the folding rollers to fold the sub-product.

Abstract: A sheet folder apparatus for use with a web-fed printing press includes upstream and downstream folding assemblies and a conveyor for delivering cross-folded sheets from the upstream assembly to the downstream assembly. A head stop is positioned within the delivery path defined by the conveyor for limiting the movement of the cross-folded sheet along the path and for positioning the sheet relative to the downstream folding assembly. The position of the head stop along the delivery path may be adjusted during operation of the apparatus so that it is not necessary to shut the apparatus down to make adjustments to accommodate various signature size and format changes in the apparatus. A registration system is also included for registering the two folding assemblies relative to the apparatus when either the upstream assembly is replaced or the downstream assembly is enabled.

Abstract: It is the object of the invention to provide a simple folding device rotating at high speed, the folding device producing a longitudinal fold without any sliding guidance device or reverse-motion device, and in which during the folding the folding blade executes a movement of stroke, perpendicular in every direction, towards the printed copy.

Abstract: A web-fed printing press with apparatus for the making of a longitudinal fold in the conveying direction of the printed copies, the longitudinal fold being preferably produced after a cylinder cross-fold. The folding device includes a folding blade disposed parallel to the conveying direction, the folding blade being moved in a reciprocal vertical fashion through the intermediary of drive cranks. Without sliding guide parts, the vertical reciprocating motion is executed towards the printed copy, and the additional crank is driven through the intermediary of a toothed belt.

Abstract: A sheet-folding device having pairs of prefolding and pressure rollers (3, 4 and 8, 9, respectively) of identical diameters successively arranged for rotation in a machine frame (1). A first pressure roller (8) is stationarily mounted to machine frame (1) for rotation, whereas the first prefolding roller (3) is rotatably mounted on spring-urged support members (10) which are slidable normally to the folding direction (A). The second prefolding roller (4) is mounted for rotation on shaft (14), said shaft being supported in lever arms (15) pivotally mounted to machine frame (1). Connecting arms (21) are hinged to the shaft (14) to support the second pressure roller (9) for rotation on shaft (13).

Abstract: An improved paper guide device is disposed close to folding rollers in a folding machine of a rotary press as spaced from an outer circumference of a folding drum. During normal operation, the paper guide device is preset to allow for minute movement of the folding rollers during the folding operation. But when the folding rollers clog with paper and move apart beyond a predetermined distance, the paper guide device moves as interlocked with the folding rollers. Therefore, paper guides of the paper guide device never contact the folding rollers. Preferably, the position of the paper guides relative to the folding rollers can be changed such that the widths of the respective gaps between the paper guides and the folding rollers can be adjusted.

Abstract: A chopper folding machine including a chopper blade and a conveyor belt driven synchronously by a drive system for a folding apparatus put in juxtaposition with a printing machine, and a timing adjusting device provided in a drive system for at least one of the chopper blade and the conveyor belt for adjusting the timing of chopper folding. Thus, the timing of the conveyance of a signature, to be folded, by the conveyor belt and that of vertical movement of the chopper blade are adjusted.

Abstract: A folding machine of a rotary press is of the type that after superposed paper sheets have been cut out by means of a folding drum and a cutting drum, a folding blade is projected from the folding drum to insert the cut paper sheets between a pair of folding rollers for folding. A gap adjusting device for the folding rollers is composed of a pair of support arms for the folding rollers which are swingable about a pair of fixed shafts. Vertically movable adjusting tables are disposed under the respective support arms and a pair of links connect the adjusting tables with the respective support arms. In a variation a pair of arms pivotably supporting the folding rollers are coupled via a pair of adjusting levers pivotably supported from a single support shaft disposed under a middle portion of the support shafts of the arms and links.

Abstract: A method and apparatus for folding a length of material includes forming first and second transverse folds at opposite ends of the material whereby the material defines first and second end parts and a central part. Longitudinal corrugations are formed in the first and second end parts in order to reduce a transverse dimension of the first and second end parts. A third transverse fold is formed in the central part in order to bring the first and second end parts into superposition. In the resulting folded material, edges of the first and second end parts are recessed inward from edges of the central part.

Abstract: Flexible drapable sheets, such as cloth sheets or garments, are folded and stacked. A first horizontal conveyor conveys the garments past an automatic sewing machine to a lifting device which engages a middle portion of the garment and stuffs it into the inlet of a vertical second conveyor formed from two sets of horizontally spaced conveyor tapes. At a discharge end of the second conveyor, the garments are discharged onto a receiving surface formed by a number of bent wire sections interleaved with the conveyor tapes of the second conveyor. The receiving surface is flipped over (pivoted about a horizontal axis) to flip the folded over garment onto a platform above the first conveyor. The garments are stacked to a desired height on the platform.

Abstract: A general-purpose document folding machine comprises a folding module including at least one folding blade on a main document path. A pair of feed rollers and a pair of ejector rollers for advancing and ejecting documents are associated with each folding blade, disposed one on each side thereof and adapted to have the rollers driven to advance documents along the main path. At least one deflector flap on the main path diverts selectively from the main path documents that are to be folded. Drive means displace each folding blade transversely to a diverted document facing it in order to fold the document and also displace each folding blade along the main path at a longitudinal speed substantially equal to the rate of advance of the documents along the main path. This is in order to fold a diverted document while in motion and insert it between the rollers of the respective pair of ejector rollers.

Abstract: A device for halting sheet products transported by a conveyor belt, comprising an abutment having a conveyor belt passing through it and an adjustable braking device placed ahead of the abutment. By this arrangement it is possible to ensure a high degree of convenience of operation and of reliability if the impact of the products on the abutment is able to be sensed by means of a sensing device and the position of the braking device is able to be corrected in accordance with an output value produced by the sensing device.

Abstract: A method and an apparatus for folding paperlike material, such as documents, which may have different quality and length and are conveyed in assembled form or successively in a transport track, said paperlike material having a leading and a trailing edge and being provided with a fold at a location between its leading and its trailing edge by bending the leading edge and the contiguous portion of the material out of the transport track during conveying of the material until the trailing edge reaches a predetermined position and creating a sharp folding edge by bringing the edge to be folded between folding means by a folding blade moving substantially in the transport track.

Abstract: A web of flat plastic bag stock formed with transverse perforations and heat seals is separated into individual bags, then individually formed in plural folds and the folded bags are stacked for packaging. To form as many as three folds, four rollers are used. The individual, separated bag is forced between the first and second rolls by a reciprocating first "blade" which contacts the middle of the bag. After being formed with the first fold, the bag is forced between the second and third rolls by a reciprocating second "blade". The twice-folded bag is then forced between the third and fourth rolls by a third reciprocating "blade" and, after the third fold, is conveyed away on belts to a stacking station where plural bags are deposited as a layer on a table. The layers may be packaged by hand or by suitable machinery.

Abstract: A quarter-folder operates at high speed by reducing the leading edge to leading edge distance between successive papers, and continuing to move the papers forward while urging the papers down between folding rolls. The folding rolls are obliquely disposed so that a tucking blade urges a portion of the paper between the rolls, and the angular disposition causes the paper to continue. A plurality of pairs of folding rolls receives a paper for complete folding. Retarding brush rollers will slow the folded paper to be received by a conventional creel.

Abstract: The present invention relates to second-fold rollers for a folding device adapted for cutting and folding superposed paper webs into a folded section of superposed sheets. The second-fold rollers are arranged in a pair in parallel each other, at least one of which is provided with at least one of non-contact section so formed as to prevent from contacting with the rear corners of the paper sheet to be passed between these second-fold rollers. The non-contact section is a recess partially formed in its cylindrical surface near each end of the second-fold roller.

Abstract: A sheet folding machine having a pair of sheet folding rollers and a widthwise displacing direction sheet stopper provided in a sheet conveying path. The pair of sheet folding rollers are rotatable perpendicular to the sheet conveying direction of the sheet conveying path and abut against each other with the sheet stopper disposed along the sheet conveying direction. An idle roller adapted to depress a sheet against one of said sheet folding rollers. A curving member bends the sheet towards the nipping region of the pair of sheet folding rollers. A control mechanism detects the delivery of the sheet to the pair of sheet folding rollers and operates the operating mechanism for a predetermined period of time.

Abstract: This invention provides an apparatus for quarter folding sheet products such as newspapers and the like, which includes a pair of cooperating fold rolls, a sheet supporting surface above the fold rolls, a rotatable cage assembly carrying a tucker blade that tucks a sheet into the nip of the fold rolls during each revolution of the fold rolls, a pressing device for exerting a force against one group of the ends of the product being folded and cam device operating the pressing device in timed relationship with the tucking of a sheet product into the fold rolls.

Abstract: The invention is a drive system for folding blades for the folding of flat material, preferably paper, in folding devices working by the principle of blade folding, consisting of one or several universal joints interposed between the drive and output shafts of the folding-blade drive. Universal joints may be used so that the shafts are in different planes and the angle of intersection of the shafts is greater than zero. The irregularity of the angular velocity achieved will cause an extreme displacement of the point of return, so that the folding blade will contact the sheet with a small velocity and will then be considerably accelerated to reach the velocity of the folding rollers prevailing at the moment of transferring the sheet to be folded to the folding rollers. The drive and output shafts may also be telescopic shafts.

Abstract: A folding machine for flat material such as bed sheets or blankets which folds the material into thirty-seconds, conveys the material to an integral stacker and stacks the same. The machine includes a positive drive to each of a pair of relatively movable folding rolls through a single belt which insures that the two rolls are driven at exactly the same speed. The conveyor also serves to smooth the material by removing wrinkles so that the folded material has an ironed look. The stacker is shaped to give the material extra rigidity so the conveyor can push the material onto the stacker and includes a pair of drop doors sized and positioned to achieve maximum stack height without increasing the size of the overall folding machine.