Abstract: A bender bar intercepts xerographic copier paper traveling from a transfer corona to the fuser rolls in a manner that compensates for sheet skew before the sheet arrives at the nip of the transfer rollers. The bender bar is fixed in position but adjustable so that copy sheets encountering the bar can have different path lengths with respect to opposite ends of the bar as encountered by the sheets. The sheet leading edges arrive at the fuser roll nip in a manner that compensates for any transfer distortion caused by factors such as axial misalignment between the fuser and input rolls, engagement of the paper by other elements associated with the transfer station paper path, or the like.

Abstract: Successive stacks of flexible paper sheets are supplied by the conveyors of a feeding unit in a first direction and along a first horizontal path onto a succession of vertically movable sections of a horizontal table while the sections dwell in their upper positions. The sections are thereupon lowered simultaneously to the level of a second horizontal path wherein a pusher advances the lowered stack in a second direction at right angles to the first direction and along the second horizontal path into the range of two belt conveyors forming part of a removing unit. The sections of the table are disposed one behind the other, as considered in the second direction, and are raised individually back to their upper positions as soon as the pusher advances an article therebeyond. A supporting member assists the sections in supporting an oncoming article in the first path during advancement of such article to a position above the sections of the table.

Abstract: A ticket diverter module for placement in a ticket handling system includes a housing having a transport passage and a capture passage intersecting the transport passage and includes a diverter member for diverting a ticket from the main transport passage into the capture passage in response to a selective directional movement of the ticket.

Abstract: An apparatus for positioning an interleave on a finished sheet product prior to transferring and depositing the latter in a stacked relation. The apparatus includes a stripper means for removing the lowermost interleave from a stack of such interleaves and advancing the same on a conveyor arrangement to a pick-up station whereat the interleave is raised into engagement with a pair of gripping arms of a reciprocal shuttle. The shuttle transports the interleave to a forward position in vertically spaced relation to the sheet product for subsequent deposit thereon prior to removal of the sheet article along with the overlying interleave by a transfer apparatus.

Abstract: Apparatus for changing the orientation of successive stacks of overlapping paper sheets has a first conveyor which delivers stacks seriatim onto the upper side of a support located below a vertically movable and rotatable turntable having at its underside a layer consisting of rubber and formed with openings for escape of air. The support has plenum chambers which discharge streams of compressed air against the underside of a stack between the support and the turntable whereby the stack is lifted off the support and bears against the layer at the underside of the turntable before the latter begins to rotate through 90 degrees to thus change the orientation of the stack. Prior to rotating, the turntable is moved downwardly toward and bears against the stack on the support to thereby expel air from the stack and to cause opening of valves in the upper side of the support by way of the lowermost sheet of the stack.

Abstract: An apparatus for cutting and collating cards or tickets arranged on paper stock in a specific sequential printed side-by-side order by moving a common one of each pair of cards or tickets laterally of their path of movement along a camming surface, which camming surface places the moving card or ticket of each pair behind the other card or ticket of that pair of tickets all in a proper sequential arrangement.

Abstract: In a bag-making machine comprising a tube-making device and a device parallel thereto for forming bases on flattened individual tube sections fed longitudinally from the tube-making device, an apparatus for deflecting the tube sections comprises spaced parallel double belt conveyors respectively leading to and from a transverse double belt conveyor. A first turning device transfers the tube sections from one of the parallel conveyors to the transverse conveyor so that they continue to be fed longitudinally and a second turning device ensures that the tube sections are fed transversely to the base-forming device.

Abstract: A device for piling up flat workpieces especially box blanks characterized by a conveyor for transporting the box blanks in at least one stream of staggered blanks, a device for braking and separating the blanks in each stream of box blanks, a device for removing box blanks having contingent flaws from the conveyor, a piling device for forming piles of box blanks from the stream of blanks in the conveyor, a removing device for removing the piles of box blanks created in the piling device, a device for creating batches of box blanks standing on their edges from the piles and a device for transferring the piles of box blanks in an aligned fashion to the device for creating the batches. In particular the device for conveying includes a plurality of conveyors aligned one after the other in the direction of transport with the last conveyor in the direction of transport being pivotable around the drive roller and being part of the device for rejecting box blanks having contingent flaws.

Abstract: To minimize the number of components of the printing system and require only a single impression cylinder, a sheet transport chain is carried about a second one of three rubber cylinders (3, 5, 7) to receive a sheet from the impression cylinder (2) to which the sheet is first applied for a first prime printing by a first rubber cylinder (3), the sheet being led about the second rubber cylinder and between a third rubber cylinder (7) which applies verso printing thereon, with the second rubber cylinder acting as a counter or impression cylinder for the third rubber cylinder; each one of the rubber cylinders has a plate cylinder (4, 6, 8) associated therewith, the second rubber cylinder applying the second prime print being positioned above the chain drive, the first rubber cylinder and the first plate cylinder being positioned above the impression cylinder (2) and the third blanket cylinder and the third plate cylinder being positioned below the printing cylinder, thus providing for compact construction of the

Abstract: A re-registering feeder machine which is also an improvement to a separating machine accepts sheets of paperboard or other material with various angles of skew, registers them and feeds them to a following machine. A conveyor deck moves the sheet in a first direction where at the last roll the sheet is held down by a plurality of balls in cooperative rotation with the last roll and its leading edge meets a side register guide having a plurality of pairs of tapered drive rolls to grip the sheet along the margin and move the sheet in a second direction at right angles to the first direction after the sheet has been registered. Coatings on the conveyor rolls except for the last roll which has the cooperatively rotating balls in contact therewith provide a proper friction between the rolls and the sheet allowing the sheet to turn in either direction until the angle between its leading edge and the side register guide is zero.

Abstract: A device for aligning sheets in a stack relative to at least one reference surface of a support tray. The device includes at least one movable alignment arm extending into the tray and a mechanism for transporting the arm to contact a sheet periodically and to move said sheet in a direction perpendicular to the reference surface for alignment.

Abstract: A device for sorting out individual articles which differ from the main quantity in a consecutive feedout. Articles to be conveyed in response to specific conditions, for example monetary bills which are to be discharged individually and which are to face the same direction, are supplied to a nip between a pair of rollers, with the axes of said rollers being disposed in a plane forming an acute angle to the path of conveyance through the rollers. The articles are sensed individually after passing said rollers, and if the specific condition is not fulfilled the direction of rotation of the rollers is reversed, whereby the differing articles (bills) are returned towards the place where they originally entered the nip but are conveyed down below a shield which they have passed over in their previous conveyance. The rejected articles are collected after having passed below the shield.

Abstract: Apparatus for marshalling glass sheets comprises a conveyor capable of conveying an array of sheets lying in a transverse sheet array across the conveyor to a sheet removal station, transverse conveying means extending transversely above the conveyor and transfer means operable to transfer a sheet or sheets from the conveyor to the transverse conveying means at the sheet removal station. The transfer means includes a plurality of selectively and separately operable transfer devices, such as lifting devices, extending in an array across the array of sheet positions, and control means for controlling simultaneous operation of selected transfer devices.

Abstract: A method and apparatus for segregating articles, such as envelopes (14a, b, or c) bearing address labels (15) into separate groups, with all the articles in each group having the same unique mark (such as a zip-code-area mark). The apparatus includes a right angle conveyor (12) positioned perpendicular to a discharge conveyor (10), an article deflector plate (20), and two or more freely rotatable balls (38, 40) supported in contact with the right angle conveyor (12) and spaced laterally across the face thereof. At least one freely rotatable ball (38) is selectively removable from contact with the right angle conveyor (12) by a solenoid (18) acting through a beam (32) and a control arm (26). The solenoid (18) is activated by a signal from a detector (16) which detects a change in unique markings on address labels of articles just prior to their engagement with the selectively-removable, freely-rotatable ball and the right angle conveyor.

Abstract: A copy sheet reversing apparatus is arranged on a reproduction machine for changing the direction of movement of copy sheets from the reproduction processor to the opposite direction to a finishing station. The reversing or turn-around apparatus is devised to accomplish reversal of direction in the smallest space possible without causing sheet deformation while the same is still pliable from image fixing in the processor. An arrangement of large diameter flat-rimmed wheels and cooperating transport belts join together for transporting each sheet around a fairly tight curved path.

Abstract: A reversing mechanism for use with a cut sheet item feeder in a printer/copier wherein a pair of contrarotating roller members each of which is angularly oriented relative to the horizontal rotative axes thereof operate in conjunction with individual spring biased pressure rollers solenoid actuated so as to cause sheet items disposed therebetween to move selectively in either one of two opposite directions and wherein a one-way movable member disposed in the path of the items prevents the items from returning back into the input pathway. Photo optical control means actuated by passage of each item time the reversal mode of the apparatus by applying a reversal signal to the solenoid actuating device controlling the contrarotating rollers.

Abstract: A method and apparatus are provided for transporting documents in first and second adjacent parallel transport paths in aligned rows of two documents transverse to the paths and for arranging the documents into a single stack of documents wherein the two adjacent documents of each row in the transport paths are stacked one on top of another so that the document from the first path is below the adjacent document from the second path.

Abstract: A sheet inverter which accommodates the reversal of motion of sheets of different sizes within a curved fixed length inversion chute having a variable buckle control provided by highly flexible and low force spring members chordally intersecting the inverter chute which provide assistance in positively feeding the sheet back out of the chute, after it has been positively buckled therein against the chute end, but allows the undisturbed formation of buckles of various dimensions within the chute depending on the size of the sheet.

Abstract: A stacker apparatus for flat sheet material has a suction drum rotating on a stator. The suction drum grips the flat sheet material at one tangential position, arcuately moves it, and releases it on a stack at a second tangential position. The suction drum has a section containing a plurality of suction openings for gripping the sheet material. A plurality of peripheral suction channels on the stator communicate with the suction openings. The width of the suction channels decreases step-wise along their length so that the suction openings are initially in full communication with the channels, thereafter the suction openings are partially closed, and finally, selected ones of the suction openings are completely closed as the drum rotates.

Abstract: Stacking apparatus for stacking sheets in corner registration to form sets positioned with respect to a finishing device such as a stitcher or stapler. The apparatus comprises a stack support surface which is inclined downwardly towards an endless belt extending across the surface and which forms a registration stop. The belt aligns the sheets in one plane and full corner registration is achieved by driving the belt to feed the sheets against a second registration stop.

Abstract: Apparatus for stacking sheets in corner registration comprises a stacking surface inclined downwardly towards a registration corner and a pair of coacting sheet feed rolls of tapered cross-section adjacent the upper end of the stacking surface for directing sheets into the registration corner. With such an arrangement the sheets are so oriented that they present a leading corner to the registration corner along a line following the direction of advance and aimed into the registration corner. The rolls may be continuous or discontinuous.

Abstract: An apparatus for dividing an imbricated stream of printed products into individual mutually separated sections, comprising a separator device which, in the conveying direction of a conveyor device, can be moved with a speed which is smaller than the conveying speed of such conveyor device. The separator device is equipped with a clamping device which selectively retains, for a certain time, a printed product and which can be forwardly moved at the speed of motion of the separator device. Owing to the lower speed of movement of the fixedly-retained printed product, in relation to the conveying speed of the conveyor device, there is formed a gap with respect to the leading printed product of the preceding section and which printed product moves forwardly at the full conveying speed. By means of this gap the successive sections can be separated from one another.

Abstract: Apparatus for producing copies having images on both sides thereof. The apparatus includes a movable image transfer member, and image forming station for producing first and second unfixed transferable images on the image transfer member and first and second image transfer stations for transferring the images from the image transfer member to a copy sheet. Located between the first and second image transfer stations are a plurality of vacuum rollers including at least a first roller located adjacent to the image transfer member and a guide member associated with the vacuum rollers, the vacuum rollers and guide member forming a copy sheet inversion path.

Abstract: A sheet reversing mechanism having drive rolls independently activated for driving sheets into and out of a sheet reversing station at different rates. A first shaft supports a drive roll engaging an idler roll supported on a second shaft and a drive roll supported on the second shaft engages an idler roll supported on a third shaft. The diameters of the idler roll and the drive roll on the second shaft are different providing corrugations in sheets driven out of the reversing station.

Abstract: Belt type conveyors for letters and the like, having a switching device between them, which device comprises a roller having a flattening on its circumference i.e. a segmented roller, driven by means of a one-rotation coupling when a letter is sensed on the conveyor approaching the switching device.

Abstract: Method of and apparatus for squaring reams of paper as they are fed toward a wrapper, the squaring up being accomplished as the reams are moving forward toward the wrapper.

Abstract: A cornering conveyor, meaning a conveying enabling infeed of products in one direction and outfeed thereof in another direction, usually but not exclusively, essentially at right angles to one another. The conveyor or conveyor system of the invention comprises an infeed conveyor and an outfeed conveyor which travels past the discharge end of the infeed conveyor and at an angle with regard to its direction of conveying of the products or the like. The outfeed conveyor operatively has associated therewith essentially conical clamping bodies mounted to be rotatable about their related axis and arranged in succession in the direction of conveying of the outfeed conveyor and in spaced relationship from the discharge end of the infeed conveyor. The tips of the clamping bodies are directed towards the conveying direction of the infeed conveyor.

Abstract: An apparatus is disclosed for transferring sheet material from a receiving station to a stacking station. A vertically reciprocative roll case is mounted to a stationary main frame by airsprings. Horizontally reciprocative transfer arms mounted on the main frame between the parallel rolls of the roll case, extend to transfer a sheet assembly to an adjacent stacking station when the roll case drops to a level below such arms. Stacking arms extending between but below the extended transfer arms are cantilevered from a vertically movable carriage on a support frame and receive the sheet assembly when the transfer arms retract. Accumulator arms parallel to and vertically aligned with the stacking arms are carried by a separate carriage movable vertically on the support frame. The stacking arms index downwardly a short distance upon receipt of each sheet assembly from the transfer arms.

Abstract: Apparatus is disclosed for offset stacking two or more sets of sheets produced by a copier or the like. The apparatus includes two rotatable sheet-engagable rollers which form a sheet propelling nip. At least one of the rollers is selectively movable between two positions, so that in the first position the nip imparts a first velocity profile to sheets of the first set to move them seriatim to a first stacking position and in the second position the nip imparts a different velocity profile to sheets of the second set to move them seriatim to a second stacking position offset from the first stacking position.

Abstract: The invention concerns a sheet feed for rapidly and accurately placing a sheet onto a processing station. A carriage is movably mounted above this processing station and reciprocated for feeding. Two belts extend between the sheet feed frame and opposite ends of the movable carriage, leaving an opening in the carriage. When the carriage is reciprocated, the belts transport the sheet to register it, feed it through the carriage opening onto the processing station, hold it down on the processing station, and remove it from there.

Abstract: A conveying unit for feeding preshaped pieces of cardboard to a machine for packaging cigarettes into hinged lid packets, the unit including a first and a second conveyor arranged substantially at right angles to one another and along each of which said pieces are advanced in contact with a support surface, the second of said support surfaces being arranged at a higher level than the first, and a transfer mechanism being provided to raise said pieces one by one from said first surface, support each raised piece in said raised position, and then push the same on to said second surface.

Abstract: The method and apparatus for offsetting sheets laterally with respect to their travel in a predetermined direction along a path. The method includes directing the sheets away from the path and through a second curved path aligned in skewed relation to their direction of travel in the original path and then directing the sheets back into the original path. Where some sheets are selectively fed through the second path and others only along the original path, they all can then be collected in a single stack in laterally offset relation to each other. The apparatus for offsetting the sheets includes feeding means for feeding the sheets in the predetermined direction along the original path and guide structure for directing the sheets along the curved path. The guide structure is curved about an axis skewed relative to the direction of travel of the sheets along their original path to effect the offsetting.

Abstract: A method for changing the direction of travel of a sheet includes the steps of providing a pocket, guiding a sheet traveling in a first direction into the pocket, and providing a fluid stream in the pocket to bias the sheet in a substantially opposite direction, thereby reversing the direction of travel of the sheet.

Abstract: A slip plate located at the discharge end of an endless band transport device is provided with apertures on both sides at the end remote from the transport device and a stop located at that edge between the apertures. Alternately operating clamping devices movable at right angles to the direction of movement of the textile pieces of the slip plate convey the textile pieces by clamping at the apertures to stacking tables to the right and left of the slip plate.

Abstract: A process and apparatus are provided for joining overlapping fore and rear ends of two pieces of deformable material which are placed in overlapping relationship through the conjunctive use of a first fixed support surface supporting a protruding rear edge of one of the pieces of material and a second rotative support surface supporting a non-protruding fore edge of the second piece of material. Each support surface is provided with associated devices for shifting an associated support edge of material to create small waves of material near the edges of the first and second pieces of material. The shifted pieces of material are overlapped by rotating the second support surface into substantial alignment with the first support surface thereby bringing the fore edge of the second piece under and in contact with the rear protruding edge of the first piece. A pressing device joins the overlapped edges of the two pieces of material by pressing them against the second support surface.

Abstract: A card reader is disclosed for reading cards and like materials one at a time, the card reader having a transport mechanism and special control circuitry for control of same so as to provide single feed card transport over a predetermined transport cycle. The reader controls provide means for selecting the amount of data to be read from the transported card and for controlling the transport cycle in accordance with the selected portion of the card which is to be read. The reader of this invention is suitably a subcombination of an addressable system comprising a plurality of like devices which are addressably controlled by a central processing unit.

Abstract: The aperture mask conveyor and inspection system comprises a pair of belt conveyor assemblies which between them grip and transport an aperture mask from the end of the processing unit to a chute assembly which chute assembly feeds the mask onto a belt conveyor, a densitometer is centrally positioned on the belt conveyor to provide a measure of the amount of light transmitted through the center portion of the mask which is passed beneath the densitometer. After passing under the densitometer the mask is deposited on an adjacent tray.

Abstract: In the automatic conveyor system for conveying corrugated cardboard sheets from a sheet making machine, the sheets are delivered to a right angle roller conveyor to change the direction of the travel of the sheets at right angles to the delivery from the sheet making machine; a transfer conveyor receives the sheets from the right angle conveyor and transfers the sheets to a stacker conveyor, at the stacker end of which latter the sheets are stacked. A back-up aligning device facing toward the direction from which the sheets are delivered from the sheet making machine is adjustable in accordance with the size of sheets. Above the transfer conveyor is a snubber with predetermined relation to the sheets thereon, and means are provided to adjust the snubber conveyor also in accordance with the size of the sheets. At the stacker end of the stacker conveyor are back-stops against which the sheets abut to be aligned in the stack.

Abstract: Sheet handling apparatus including burster apparatus for separating continuous form webs into sheets and for feeding the just-burst sheets along a sheet path to a stacker mechanism where the sheets are stacked on end in the same order they were in the web. A plurality of feeding means is spaced along the sheet path and these feeding means are selectively actuated to feed any size sheet and as the sheets are fed along the sheet path, each sheet can be selectively laterally offset to a plurality of laterally separated positions to facilitate the separation of the sheets into sets of copies, data sets or jobs.

Abstract: Apparatus for applying plastic material to the four edges of a multiple-pane window comprises first and second pairs of nozzles and first and second carriers for moving the window horizontally between the nozzles of each pair in succession. Transfer means, particularly a rotating column with a laterally extending arm, transfers the window from one carrier to the other and rotates the window to bring the edges uncoated at the first station in position for coating at the second station. The transfer device is advantageously correlated with the downstream limit of the first carrier and the upstream limit of the second carrier to transfer and rotate the window about its axis of symmetry. A function of the window length on the first carrier is measured and the separation of the nozzles of the second pair adjusted accordingly. A supply device centers a window and deposits it in a predetermined centered position in the first carrier.

Abstract: A sheet handling means is provided for use with a duplicating machine. A duplicator is provided having first and second printing couples for printing first on one face of a copy sheet and then on the other and whose paper feed paths are arranged substantially normal to each other. The duplicator also includes special sheet handling means for passing the copy sheet from the first to the second printing couple and also inverting the sheet. The copy sheet is advanced in a first path and direction away from the first printing couple and is advanced in a second path substantially normal to the first path in a second direction towards the second printing couple. The sheet handling means comprises a sheet turn-over device positioned to intersect the copy sheet paths for receiving and progressively inverting the copy sheet as it is advanced in the first path and simultaneously directing the sheet from the first to the second path.

Abstract: The device is of the type having a stacking drum with openings in its cylindrical periphery by means of which the articles to be conveyed can be adhered by suction to the drum and accumulated in an orderly stack, with the suction air being effective only within a predetermined circumferential range of the stacking drum. The stacking drum is so arranged in the conveying system that the articles to be conveyed are fed tangentially to the drum, and the stacking drum has only a single row of openings in its circumference, with the row extending parallel to the axis of the drum. The openings may be selectively connected either to vacuum or to a source of air under pressure so that, with suction being effective in the openings, the articles are grasped by the stacking drum at the leading edge, discharged around the stacking drum and fed to the stack while, with compressed air being supplied to the openings, the articles pass by the stacking drum and move on to a following conveying system.

Abstract: The subject device prevents a moving document from lifting off a support deck. A plurality of stiffly resilient flaps extend from a frame close to the deck and are canted in the direction of card travel. Removable mounting blocks clamp the flaps to the frame, with opposed surfaces of adjacent blocks guiding the flaps in the proper orientation. An end flap may be extended in length for further document guidance.

Abstract: The stack forming device according to the invention comprises a traction surface which is rotatably driven. The portion of the trailing edge of a sheet to be stacked is kept in contact with the traction surface so that the trailing edge of the sheet is displaced in synchronism with said surface. This displacement is carried out over a period which follows the abutment of the leading edge of the sheet against a stop provided on a stacking platform. As a consequence the sheet acquires a convex configuration and is finally propelled against the platform or the preceding sheet after release by the traction surface. The device may be equipped with supplementary blowers in order to facilitate the release from the traction surface. It is of particular interest for high speed stacking of photographic film sheets, preferably double-side coated ones.

Abstract: A system for automatically loading mail into a postal tray. A tray support mechanism holds a postal tray at a steep angle at each of two loading stations within the system. A transport system conveys articles of mail to one of the two stations where each piece of mail is ejected laterally into the tray. The tray is gradually moved downward as it is filled. When completely filled, a changeover mechanism begins to fill the tray at the other station while the filled tray is removed and replaced.

Abstract: A system for presenting documents to a xerographic exposure station includes a first fluidic storage station in which a rack for storing documents is located. The rack includes a plurality of pockets in each of which a document may be stored, the rack being movable in a vertical direction. A fluid stream is used to move a document in a pocket out of the storage apparatus through an opening and into orthogonal registration at the exposure station. Exposed documents are fluidically moved to a second fluidic storage station which is similar to the first, the exiting direction being generally transverse to the path followed by a document in entering the exposure station. Vertical movement of the racks at the first and second storage stations is used to serially feed documents to the exposure stations and to provide a pocket for each of the exposed documents.

Abstract: A cartridge is provided for microfiche in the form of a box having a series of elongated rectangular pockets in a stacked array, one above the other and with exposed front openings. Each pocket is dimensioned to receive one microfiche. Cut-out portions are provided on opposite sides of the box to intersect the pockets and expose edge portions of each microfiche stored in the pockets. With this arrangement, appropriate friction wheels in the cut-out portions of the box can be provided on a stationary frame structure to eject a microfiche from the cartridge automatically and pass the same onto a microfilm viewer.

Abstract: In order to make utmost use of the time and effort of an operator, a duplication system has been devised in which first the duplicator equipment feeds the copy paper along a linear path while producing the copies, the path then turns, and the copy is fed by a direction changing means in a direction substantially normal to the original path into a sheet distributor which has its unloading apertures arranged so as to be convenient to an operator standing at an operator station beside the discharge end of the duplicator device at the operation side thereof. The distributor is of a type such that the unloading openings are exposed to operator access at or slightly above waist level, and is preferably a rotary distributor capable of moving the filled pockets to a fixed unloading position.

Abstract: A conveyor is provided for accepting sheets moving in one direction from a duplicator and conveying them at an angle to the initial direction; e.g., 90.degree.. The conveyor consists of rollers of relatively large diameter arranged with close spacing so that sheets of paper will pass easily from one to the other, and entering sheets will find fairly continuous support whatever their size. The rollers are set at an angle to the desired feed path to provide an effect urging the sheets towards a side alignment stop and the construction is such that the angular roller setting may be readily made during manufacture, to act towards whichever side of the feed path is selected as the one to carry the alignment stop surface.

Abstract: A sheet material conveying and stacking apparatus is provided which utilizes a pivotally connected conveyor having air jets with a further conveyor located downstream also having air jets. The pivotally connected conveyor is placed in a first position so that sheets of material will be transported to the subsequent conveyor which utilizes air jets to displace the sheets of material onto a further conveyor which transports the sheets to a weight-responsive stacker. After the sheets have filled the stacker, the pivotally connected conveyor may be pivoted to a second position which locates the air jets above the passline of the sheets being transported by the conveyor preceding the pivotal conveyor. The sheets are then displaced by the air jets onto another conveyor located below the air jets, the sheets then being stacked in another weight-responsive stacker.