Abstract: A printing apparatus for printing a printing-paper is provided with two plate cylinders each holding a plate, two blanket cylinders coming into contact with the plate cylinders respectively and a single impression cylinder coming into contact with these blanket cylinders. Each plate has two printing areas. The two plate cylinders and the two blanket cylinders have the same diameter, which is twice that of the impression cylinder. The impression cylinder is in contact with a feed cylinder and a removal cylinder, and a reverse cylinder is provided to be in contact with the feed cylinder and the removal cylinder. The printing apparatus performs printing corresponding to one of the printing areas of each plate on a single surface of the printing-paper, reverses the printing-paper, and performs printing corresponding to the remaining printing area of each plate on another surface of the printing-paper.

Abstract: A turning device for a sheet-fed printing press contains a turning pocket (9) which is bordered by two walls (10,11) which in the interior of the turning pocket are situated close together and which at an opening side of the turning pocket are a predetermined distance from each other forming an elongated sheet intake and output opening (12) with two edges parallel to each other.

Abstract: An apparatus for personalizing identification cards with integrated circuits includes at least one printing unit and a reversing unit for reversing and transporting the printed identification card. The reversing unit has a rotor, at least one card transport device fastened thereto and a contacting device for loading the integrated circuits onto the cards.

Abstract: During first side printing, a media sheet is fed along a feed roller over a refeed guide toward a metering roller and into a print zone. As the trailing edge approaches a metering pinch line, the metering roller stops. After a drying time, the rollers reverse direction. The refeed guide directs the media sheet around the metering roller onto an inner guide having a reversible roller. When the trailing edge of the media sheet clears the refeed guide, the reversible roller is moved into contact with the metering roller causing such roller to reverse direction. The media sheet now moves back along the inner guide onto the feed roller. When the media sheet trailing edge is detected at the feed roller, the feed roller and metering roller change direction back to the original direction. The media sheet now is fed through the print zone for second side printing.

Abstract: A double gear wheel of a turning device on printing presses comprises an adjustment gear wheel (4). On the adjustment gear wheel a conical seat (7) is formed, which conical seat (7) is engaged in a conical recess (9) formed on the corresponding stationary gear wheel (2), when the two gear wheels (2, 4) are clamped to one another by means of a clamping body (5). The double gear wheel described above has a compact construction, is easy to manufacture with a high degree of precision, and without the requirement for any additional elements essentially guarantees a frictional engagement which reliably prevents the mutual rotation of the two gear wheels (2, 4) during operation of the printing press, even on printing presses which consist of a large number of printing mechanisms.

Abstract: A device for guiding sheet material in a printing press, the device having a guide surface located below a path in which a sheet is guidable, includes nozzles arranged in zones within the guide surface, the zones including a first zone extending along a longitudinal axis of the guide surface, and a second and a third zone, respectively, located at left-hand and right-hand sides of the first zone, the nozzles in the first zone being blast nozzles having a blowing direction extending generally in a sheet transport direction, the nozzles in the second and third zones being blast nozzles having a blowing direction extending generally from the longitudinal axis of the guide surface to lateral edges of the guide surface, the nozzles of the first zone being suppliable with blast air independently of a supply of air to the nozzles of the second and the third zones; and a method of operating the guiding device.

Abstract: A sheet reversing apparatus for a sheet-fed rotary press with a reversing mechanism includes a paper convey cylinder, gaps, a reversing mechanism, a paper trailing end holding member, a moving unit, and a pivoting unit. The moving unit performs a moving operation of the paper trailing end holding member which projects or retreats along an arc with respect to the outer surface of the paper convey cylinder in accordance with a pivotal movement of the paper convey cylinder. The pivoting unit performs a pivoting operation of the paper trailing end holding member in accordance with a movement of the paper trailing end holding member.

Abstract: A sheet guiding device for printing presses, wherein, for recto printing, a sheet decurler is pivotable into a gap formed in a guide surface and, for recto/verso printing, the sheet decurler is pivotable out of the gap, a surface element of the guide surface being displaceable for closing the gap wherein the sheet decurler is engageable, includes a drive lever which, for switching to recto printing, is operatable for displacing the surface element in order to form the gap and for engaging the sheet decurler and pivoting it into the gap, the drive lever, for switching to recto/verso printing, being operatable for releasing the sheet decurler to swivel out of the gap and for engaging and displacing the surface element.

Abstract: A device in a printing press for applying air flow to printing stock being transferred by a transfer drum to an impression cylinder so as to achieve a flawless application of the printing stock on the impression cylinder before the printing stock reaches a printing nip defined by the impression cylinder and a blanket cylinder of the printing press includes a flat air-guide element extending over the breadth of the impression cylinder from a vicinity of the circumference of the transfer drum to as far as possible in a direction towards the printing nip so as to form a wedge-shaped space having a tip extending towards the printing nip.

Abstract: The printed products, overlapping one another in an imbricated manner, are moved, by means of the conveying device, past the first printing station in a conveying direction, where the first outer side of the printed products is provided with typographical labeling in the exposed border region. Before the printed products are guided past the second printing station, the border region of the second outer side of the printed products is exposed; for example by turning over the printed products. Printed products are then provided with typographical labeling in the border region by means of the second printing station.

Abstract: A sheet turning device including a turning drum for turning over stock or a print carrier received in an ideal path of motion from a storage drum in a recto/verso or first-form and perfector printing process is in combination with a sheet-metal guide having a surface member formed with air outlet openings for floatingly guiding the stock or the print carrier, the surface member being disposed so as to face a printed side of the stock or the print carrier below the turning drum and extending in a direction towards the storage drum.

Abstract: A sheet-guiding apparatus for a turning device in a rotary printing machine guides a sheet being printed to prevent smearing. The turning device includes a turning drum and at least one sheet-guiding cylinder. The turning drum and the sheet-guiding cylinder define a sheet transfer region and a sheet transfer path. The sheet-guiding apparatus comprises an air blower means, at least one blower/suction device, and a lower sheet-guiding device. The air blower means, which is arranged upstream of the sheet transfer region, includes a first set of air outlet openings for directing compressed air toward the sheet-guiding cylinder and at least a second air outlet opening for directing compressed air into the transfer region. The blower/suction device, which is disposed within the sheet-bearing surface of the turning drum, communicates with a plurality of openings disposed in the sheet-bearing surface and is coupled to a pneumatic device.

Abstract: Method of performing operating steps in an adjustment of a printing press, wherein adjusting members preloaded in one direction of motion are displaceable, in chronologically at least partly successive or sequential operating steps, in a direction opposite to the one direction by adjusting cylinders upon which a pressure medium is actionable includes acting, via a first pressure medium system having a pressure limitation controllable in stages, upon a second pressure medium system to which a plurality of adjusting cylinders, at least some of which are preloaded with different forces, are connected; and device for practicing the method.

Abstract: A printing switching apparatus for a sheet-fed rotary press with a reversing mechanism includes a fixed gear, a rotary gear, a fixing unit, and a proximity switch. The fixed gear is fixed to the shaft of a first cylinder. The rotary gear is coaxial with the fixed gear, coupled to be driven with a second adjacent cylinder along a paper convey direction, and phase-adjustable with respect to the fixed gear in a circumferential direction. The fixing unit fixes the rotary gear to one of the fixed gear and the shaft of the first cylinder to perform rotational transmission such that phase switching of the rotary gear between single-sided printing and perfecting printing is performed when the fixing means is released, and the rotary gear is not fixed to one of the fixed gear and the shaft of the first cylinder.

Abstract: In a printing unit of a printing press having a plate cylinder and a blanket cylinder, there is provided a combination including a press-on device having a press-on roller applicable against the plate cylinder and swivelable at a spaced distance therefrom about a swivel axis aligned parallel to respective axes of the cylinders, a finger-protection device and a blast air device for blowing air against one of the cylinders, the press-on bar having a longitudinal axis and having a plurality of rollers rotatably mounted thereon, and the blast-air device being formed of a hollow interior of the press-on bar for receiving blast air therein, and nozzle openings in the surface of the press-on bar for discharging blast air from the hollow interior thereof, the longitudinal axis of the press-on bar together with the plurality of rollers rotatably mounted on the press-on bar and the swivel axis being swivelable substantially on a plane passing through a nip between the plate cylinder and the blanket cylinder about the s

Abstract: Rotary printing press for two-sided printing of sheets having a first and a second printing unit, respectively including an impression cylinder, the press having a sheet feeder with a device for separating sheets singly from a feeder pile and a device for feeding the singly separated sheets to the first printing unit for printing one of the sides of the respective sheets, a device for conveying the sheets to the second printing unit for printing the other of the sides of the respective sheets and through the entire printing press, a delivery having a device for conveying and depositing the sheets on a delivery pile, and a control device for controlling operational sequences performed in the rotary printing press, the first and second printing units being satellite printing units disposed in tandem horizontally and, respectively, having a plurality of printing devices arranged around each of the respective impression cylinders thereof, the sheet feeder and the delivery being disposed between the first and seco

Abstract: A rotary sheet-fed printing press for recto and verso printing has a turning drum disposed between impression cylinders having double the diameter of a conventional blanket cylinder, wherein a sheet gripped at a leading edge thereof by grippers of a first one of the impression cylinders is gripped at a trailing edge thereof by grippers of the turning drum upon transfer of the sheet to the turning drum. In the turning drum, suction nozzles are provided which suck the sheet, guided on the one impression cylinder, towards the turning drum in the vicinity of the trailing edge of the sheet and, in so doing, smooth it diagonally and peripherally on the circumference of the one impression cylinder, before the grippers of the turning drum which grip the sheet by the trailing edge thereof are closed, and the grippers of the one impression cylinder which grip the sheet by the leading edge thereof are opened.

Abstract: A sheet reversing apparatus for a sheet-fed rotary press with a reversing mechanism includes a paper convey cylinder, gaps, a reversing mechanism, a paper holding unit, a gripper moving unit, and a gripper pad moving unit. The gripper moving unit moves the gripper member of the paper holding unit from the gap to an outer surface of the paper convey cylinder in accordance with a pivotal movement of the paper convey cylinder. The gripper pad moving unit moves, in accordance with the pivotal movement of the paper convey cylinder, the gripper pad member of the paper holding unit between an operating position and a retreat position.

Abstract: A printing switching apparatus for a sheet-fed rotary press with a reversing mechanism includes a fixed gear, a rotary gear, a first inclined surface, an engaging member, and an actuating unit. The fixed gear is fixed to a shaft of a cylinder. The rotary gear is coaxial with the fixed gear, coupled to be driven with a cylinder adjacent to the cylinder, and phase-adjustable with respect to the fixed gear in a circumferential direction. The first inclined surface is formed on the rotary gear. The engaging member is movable with respect to the fixed gear and has a second inclined surface pressed against the first inclined surface of the rotary gear. The actuating unit moves the engaging means in a direction to be separated from or come close to the fixed gear, presses or releases the first inclined surface of the rotary gear and the second inclined surface of the engaging member against or from each other, and connects or disconnects rotational transmission between the fixed gear and the rotary gear.

Abstract: A sheet transferring apparatus transfers a sheet between a plurality of printing units. Multiple color press on a single surface of the sheet and a single color press on both surfaces of the sheet are selectively performed. A feed cylinder is rotatably provided between the adjacent units. A power source actuates the feed cylinder. A first rotating member is mechanically connected to the power source. A second rotating member is mechanically connected to the feed cylinder. The second member is arranged to be driven by said first member. A phase adjusting mechanism automatically adjusts a phase between the first and second members in accordance with the multiple color press and the single color press.

Abstract: A method and a device for automatically starting and stopping a sheet-turning operation during the transport of sheets through a printing press for facilitating changeover of transport drums between two printing units from single side or recto-printing mode to a perfector or recto-and-verso printing mode.

Abstract: Sheet-fed rotary printing press for making one-sided multi-color prints or recto-and-verso prints, having at least one multi-size, driven sheet-guiding cylinder disposed between impression cylinders of two printing units, devices adjustable to a sheet-length format, and gripper systems associated with the cylinders, includes at least two intermediate gears via which a drive of the cylinders is divertable, at least one of the intermediate gears being formed as a single-revolution double intermediate gear having an adjustable ring gear and a gearwheel.

Abstract: A recording apparatus such as an ink jet printer or bubble jet printer consists of a recording head to record by discharging an ink to a recording paper; a conveying device to convey the recording paper; an instructing device to instruct to convey the recording paper in the direction opposite to that upon recording; and a conveyance controller to control the conveying device so as to inhibit the backward conveyance of the recording paper in the case where the recorded ink is not fixed yet when the recording paper is conveyed backward in response to the instruction of the backward conveyance. The discrimination regarding whether the recorded ink is not fixed yet is performed on the basis of the elapsed time after the recording by using a timer.

Abstract: Method and device for automatically and semi-automatically starting and stopping a sheet-turning operation and for sheet-format adjusting during sheet transport through a recto-and-verso printing press, wherein the sheets are singly transported in succession, by at least one transport drum, between two printing units, wherein, with the aid of remotely operated actuating and position-locking elements, gripper-control elements and sheet-holding segments of a storage drum are disposed so that sheets are transfered from the storage drum to a turning drum by the leading or trailing edge of the sheets, depending upon the mode of operation thereof, the grippers being, with respect to a suction device, adjusted to an appropriate sheet format. Adjustment of the sheet format can be performed both in recto-printing mode as well as in recto-and-verso printing mode.

Abstract: Sheet-fed rotary offset printing press having a printing unit including a plate cylinder, a rubber-blanket cylinder and an impression cylinder double the size of the plate and the rubber-blanket cylinders, respectively, at least one auxiliary unit selected from an imprinting unit and a finishing unit removably disposed on a tool-carrier shaft extending transversely to a sheet-transport direction and being mounted in a frame of the printing press, and drive elements for connecting the auxiliary unit to a drive for the printing press and for bringing the auxiliary unit into engagement with the sheet as it is being guided on the impression cylinder, comprising another tool-carrier shaft extending transversely to the sheet-transport direction and being mounted in a frame of the printing press, both of the tool-carrier shafts being disposed parallel to one another in the printing unit and offset from one another by a phase angle having a vertex on a central axis of the impression cylinder, and driving elements for

Abstract: A clutch mechanism for releasing a frictional connection in a double gearwheel drive of a sheet-fed rotary press wherein a gearwheel ring is mounted concentrically on and frictionally connected to a main gearwheel by a spring biased annular clamping element, the clutch including an annular actuator mounted on the press in alignment with but normally out of contact with the annular clamping element and the double gearwheel and means for selectively engaging the actuator with the clamping element and causing relative axial displacement thereof to overcome the spring bias and free the gearwheel ring from frictional engagement with the main gearwheel. The actuator may include an annular fluid pressure cylinder, a camming mechanism or an electromagnet for causing the relative axial displacement of the annular clamping element.

Abstract: A sheet-fed rotary printing machine having printing units for processing sheets with single-side multicolor or first form and perfector printing, a feeder for feeding the sheets to the printing units, and a preceding sheet processing unit located upstream of the printing units as viewed in sheet-feeding direction in the printing machine, also has a work and tumble device including a sheet turning device disposed in the sheet-feeding direction between the preceding sheet processing unit and the printing units for the first form and perfector printing.

Abstract: The invention relates to a device for changing over to single-side printing or perfecting on sheet-fed rotary printing machines. Two respective pairs of intermediate spur wheels are disposed between the printing cylinder spur wheel and the turning drum spur wheel, a first pair of the intermediate spur wheels being in the form of a double wheel. The second pair of intermediate spur wheels are secured to a solid shaft or hollow shaft, preferably received in a control means for selectively driving the solid and hollow shaft in unison or differentially to one another. In another embodiment a set of intermediate wheels includes spur wheels associated with first and second printing cylinders. Intermediate spur wheels are disposed between the printing cylinder spur wheels and an annular wheel coupled to the turning drum.

Abstract: A device for changing-over a gripper control on a gripper cylinder of a turning device in a sheet-fed rotary printing machine for first-form and perfector printing, including an adjusting gear and a fixed gear disposed coaxially with one another, the adjusting gear being adjustably movable so as to vary the angular position thereof relative to that of the fixed gear, and a clamping device for clamping the adjusting gear and the fixed gear frictionally together, comprising a control shaft axially displaceable in the gripper cylinder, the control shaft being rotatable and being coupled, via a first intermediate converting device, with the adjusting gear so that an adjustable movement of the adjusting gear is converted thereby into a rotary movement of the control shaft, a spring device for applying a reaction force to the control shaft in a clamping direction of the adjusting gear, an adjusting bridge carried by the gripper cylinder so as to be displaceable in axial direction thereof, an angle lever disposed in

Abstract: A turning device for a sheet-fed rotary offset printing press for first form and perfector printing having a storage drum disposed between a turning drum and a transfer drum, the storage drum having a diameter triple that of the respective turning and transfer drums, comprising a sheet run-up lock disposed at the storage drum before a sheet transfer point between the transfer drum and the storage drum, and projecting into a travel path of a sheet having an improperly gripped at its trailing edge; and device for performing the method.

Abstract: A device for smoothly applying a sheet for printing onto an impression cylinder upstream of a printing gap of a sheet-fed rotary offset printing machine in travel direction of the sheet through the printing machine and including a jet nozzle device having at least one jet nozzle capable of being directed towards the circumference of the impression cylinder for pressing the sheet by blowing air force against the circumference, further includes a drive device couplable with the jet nozzle device for swingingly reciprocating the jet nozzle device in travel direction of the sheet during an operating cycle of the printing machine, the jet nozzle device being mounted at a spaced distance upstream from a printing gap and being swingable in a pendular manner about a pendulum axis extending parallel to an axis of the impression cylinder, the jet nozszle device being elongated and being formed with a middle region and ends offset upstream from the middle region in the travel direction of the sheet so that the sheet is

Abstract: In a sheet-fed rotary printing machine having a sheet-turning device including a gripper cylinder and an adjusting member extending in axial direction of and axially displaceable on the gripper cylinder for changing-over a gripper on the gripping cylinder, a clamping device for the adjusting member, includes a preloaded spring, clamping members disposed on both sides of and in vicinity of axial ends of the adjusting member and being displaceable radially to the gripper cylinder, and a pressure bar axially movably guided in the gripper cylinder and biased by a reaction force of the spring in a clamping direction for firmly clamping the clamping members via respective intermediate elements radially towards the gripper cylinder.

Abstract: A sheet feeding unit for a rotary sheet printing machine which is operative for selective face printing or face and back printing with turning of a sheet rear edge and which has a turning cylinder and a printing cylinder located before the turning cylinder, includes elements located underneath the turning drum and the printing drum for conducting and guiding overlong sheets in face and back printing during a turning step on a front edge. The elements include a suction member arranged rotatably over a circular path so as to take over a sheet in a point of intersection of tangent t.sub.s, a stationary segment arch arranged equidistantly relative to the circular path under a point of intersection T.sub.4,5 of the printing cylinder and a sheet guiding cylinder and also provided with guiding rollers, and a guiding plate located above a turning point of the suction member at a distance from the printing cylinder and inside the circular path over a line of a secante.

Abstract: Sheet-guiding drum for a printing machine convertible from first form to perfector printing and in reverse, including at least two sheet-guiding surfaces formed at a circumference of segments of an outer drum part which are adjustable in circumferential direction with respect to an axial support member for journalling the sheet-guiding drum, and a clamping device for locking together the segments of the outer drum part and the journalling axial support member, the clamping device having radially directed friction surfaces disposed on the segments of the outer drum part and on the journalling axial support member and being pressable with a clamping force against one another in axial direction, and a tension rod movable in axial direction of the journalling axial support member for pressing the friction surfaces on the segments and on the journalling member against one another, includes lamellar, interengaging friction elements alternately connected to one of the segments of the outer drum part and to the journ

Abstract: Sheet-fed rotary printing press with a plurality of printing units convertible from single-page printing to first form and perfector printing and the reverse and a turning device disposed between two of the printing units, the turning device including a turning drum wherein a rotatable control shaft for effecting a gripper changeover is mounted, and a device for resetting the printing units including a gearwheel pair disposed in a chain of drive gearwheels and including a fixed gearwheel on the turning drum and, concentric therewith, an adjustable gearwheel adjustable in rotational angle, the fixed and adjustable gearwheels being clampable together, comprising means disposed on the adjustable gearwheel and actuable, within a predetermined angular range of relative movement between the adjustable gearwheel and the fixed gearwheel, on members for rotating the control shaft for effecting the gripper changeover.

Abstract: An electrical circuit-breaking device for protecting a clamping device of a sheet-guiding drum of a printing machine, wherein the clamping device has an actuating member formed with a thread and being turningly screwable therewith in axial direction over a first travel phase and a second travel phase between end positions, includes a switching member for an electrical switch connected in a power-supply circuit for driving the printing machine, the switching member being actuatable in the first travel phase of the actuating member, a device defining at least one friction surface on the sheet-guiding drum and at least one friction surface of a drum part adjustable on the drum in circumferential direction thereof, intermediate members for pressing the friction surfaces against one another, the intermediate members being actuatable in the second travel phase of the actuating member, a stop device effective in turning direction of the actuating member including a cam on the actuating member, and two cams on a mach

Abstract: A sheet-fed rotary printing machine for producing single-sided multi-color printing or perfector printing having a sheet-transfer cylinder disposed in travel direction of a sheet between impression cylinders of a first and a second printing unit, and having gripper systems assigned to all of the cylinders, includes a device defining a transfer gap between the sheet-transfer cylinder and the impression cylinder of the second printing unit, a device for enlarging the width of the transfer gap in relation to a normal gap width to the impression cylinder of the first printing unit, a gripper system having a device for bridging the enlarged width of the transfer gap, the gripper system being movable out of the circumference of the sheet-transfer cylinder so as to grip a leading or trailing edge of the sheet and transfer the gripped sheet to the outer cylindrical surface of the impression cylinder, and a device for driving the sheet-transfer cylinder and the following impression cylinder at identical circumferentia

Abstract: A method and apparatus for use with a grooved perfecting cylinder in a sheet-fed rotary printing press of the type capable of one sided or two sided sheet printing, the apparatus including a substantially rigid covering having a friction reducing coating thereon and which can be quickly and easily installed and removed over the sheet supporting surface of the perfecting cylinder when the press is operated in the one sided printing mode to permit an anti-marking fabric net to be installed and used over the sheet supporting surface of the perfecting cylinder.

Abstract: Device for adjusting a sheet format on a sheet-guiding drum of a printing machine having at least one supporting element for a sheet processing device mounted on a shaft of the drum and being adjustable in circumferential direction of the drum shaft, comprising an adjusting shaft mounted in the drum shaft and operatively connected to the sheet processing device for adjusting the sheet processing device, the adjusting shaft having a turning element at an outwardly extending end thereof, and a pinion located at an inner end thereof, the drum shaft having a bearing journal of solid material formed with a bore wherein the adjusting shaft is mounted eccentrically and substantially parallel to a central longitudinal axis of the drum shaft, and a toothed segment disposed on an end face of the supporting element at a location adjacent to the bearing journal, the pinion on the adjusting shaft being in meshing engagement with the toothed segment.

Abstract: A device for adjusting a rotational position between coaxial fixed and adjusting gears and for changing-over a gripper by axially displacing an adjusting member on a cylinder of a turning device of a sheet-fed rotary printing press, includes a pressure member for effecting a spring coupling of the gears via a radially extending pressure lever. An adjusting member which reduces the spring force is axially displaceably guidable on the cylinder and becomes effective upon the pressure member only after traversing a distance for actuating a switch of an electrical safety device in a power supply circuit of a driving device. Another electrical safety device is between control positions of the adjusting member for interrupting the supply circuit to change over the gripper control.

Abstract: A sheet-fed rotary printing press for performing alternatively single-side multicolor printing or first form and perfector printing with a sheet transfer cylinder disposed in a direction of travel of a sheet between impression cylinders of two printing units, all of the cylinders having grippers associated therewith, comprising a sheet support disposed downstream from the sheet transfer cylinder in the travel direction of the sheet and having a substantially flat upper support surface located substantially tangentially to the sheet transfer cylinder, the sheet transfer cylinder carrying grippers for grippings a trailing edge of the sheet and being rotatable so as to deposit the sheet on the support surface, with a free leading edge thereof first, as the grippers approach the sheet support, the sheet transfer cylinder being further rotatable beyond the sheet support with the grippers maintaining their grip on the trailing edge of the sheet so that the sheet is lifted from the support surface with the trailing

Abstract: A sheet reversing unit for a sheet printing press which includes a reversing gripper device and a suction lever. A cam follower is pivotally mounted on a cam lever and is brought into contact with a cam surface of a cam mechanism for opening and closing the sheet gripper. A regulating cam is arranged outside the moving path of the cam follower, so as to prevent the cam follower from falling outside its normal moving path.

Abstract: Sheet pressing means for a multi-color sheet-fed press adapted for both first-side printing and perfecting printing wherein the press includes a press frame and first and second impression cylinders with a sheet-turning cylinder therebetween. The sheet pressing means includes a plurality of hollow air-blowing fingers disposed after the printing zone of the first impression cylinder for directing blown air to press a sheet onto the surface of the first impression cylinder, with the fingers being disposed in substantially equidistant relationship to one another on a support tube which is disposed above the first impression cylinder and substantially parallel to the axis thereof along substantially the entire length of the first impression cylinder.

Abstract: Sheet-fed rotary printing machine having printing units arranged in tandem for processing both paper as well as cardboard with single-side multicolor or first form and perfector printing and having at least one sheet-turning device, each of the printing units having four cylinders consisting, in addition to a plate and a blanket cylinder of given diameter, of an impression cylinder and a transfer cylinder each having double the diameter of the respective plate and blanket cylinders, includes a base frame located between two of the printing units and carrying only two cylinders consisting of a transfer cylinder and a storage cylinder, each having a diameter double that of the respective plate and blanket cylinders, the one of the two printing units located downstream of the base frame in travel direction of a sheet through the printing machine having a transfer cylinder in the form of a sheet-turning cylinder with respective rows of tongs-grippers disposed 180.degree.

Abstract: In a suction member fixing apparatus for a sheet-fed printing press, two side plates are pivotally fitted on two end shafts of a double-diameter cylinder so that the surfaces of the side plates are in contact with end faces of the cylinder body. A fixing shaft having a head portion at one end and a threaded portion at the other end extends through central axial holes of the cylinder body and the two end shafts. Press rods radially extend through base portions of the two end shafts, are in contact with end faces of the side plates opposite to the cylinder body, and are moved upon threadable engagement of a screw member with the threaded portion to fix the side plates and the cylinder body by a surface pressure. Belleville springs are interposed between one press rod and the screw member to absorb extension of the fixing shaft due to an increase in temperature during printing.

Abstract: In a sheet turn-over apparatus for a sheet-fed rotary printing press, the right cams are a turn-over cam for gripper units A and opening/closing cams for gripper units B, while the left cams are a turn-over cam for gripper units B and opening/closing cams for gripper units A. The cams cooperate with the corresponding torsion bars arranged at the pivotal centers of cam levers to turn over and open/close the gripper units A and B. The cams are fixed at predetermined positions of frames and need not be shifted in the single side printing and double side printing. The gripper opening/closing cams need not be shifted in the non-turn-over and turn-over modes.

Abstract: A sheet fed rotary printing press is switchable between recto and recto and verso printing. A sheet transfer drum carries sheet leading and trailing edge grippers which are shiftable with respect to each other by use of a disengagable clutch. When the sheet transfer drum is placed in the recto position, stops that are carried in the leading and trailing edge grippers abut each other.

Abstract: The present invention provides a method and a device for printing images on halves of both sides of a group of receiving sheets by passing each sheet seriatim four times directly in succession through a printing station thereby printing the four halves of the sheet. The sheets thus printed are together folded double to form a book in which the sequence of the images corresponds to the sequence of the original images.

Abstract: The invention relates to a sheet turning device for rotary presses of the in-line type with double-size impression cylinders associated with a single double-size transfer or turn-over drum. To enable the sheet end to be gripped by gripper devices, the impression cylinder preceding the turn-over drum is provided with an adjustable covering, preferably a roller blind with a foil covering thereabove, to give the impression cylinder its actual diameter.

Abstract: A shift-over device for controlling the turning drum grippers of a rotary sheet printing press optionally changeable for one-side printing or two-side printing and having a relatively rotatable gripper opening cam and an axially movable gripper turning cam includes a rotatable switching shaft carrying a stop arm with adjustable stops mounted on the press frame for engaging the stop arm and limiting the rotation of the switching shaft in opposite directions. A first crank arm is secured to the switching shaft and carries a lash lever coupled to the gripper opening cam for relatively rotating it incident to oscillations of the switching shaft. A second crank arm is secured to the switching shaft and coupled to a push arm having face cams engageable with push rods connected to the gripper turning cam for axially shifting it incident to oscillations of the switching shaft.