Abstract: A leading edge side shaft 6, a tail edge side shaft 12 and a pulling shaft 14 are interlocked with one another through gears. The gears are rotated by using rotation of the plate cylinder. A leading edge side part 10a of the plate 10 is clamped with a leading edge side clamp 4 in accordance with the rotation of the leading edge side shaft 6. Thereafter, a tail edge side part 10b of the plate 10 disposed on the cylinder surface of the plate cylinder 60 is clamped with a tail edge side clamp 5. The plate 10 is pulled in a plate tensioning direction as a result of moving the tail edge side clamp 5 in the direction of the arrow 90 in accordance with the rotation of the pulling shaft 14.

Abstract: A rotatable gripper drum includes a seat mounted on the drum and a gripper supported on the drum for pivotal movement relative to the seat between an open position and a closed position. The seat is made from a resilient material and includes a body portion having first and second grip surfaces. The drum has a retaining pocket for receiving the body portion of the seat to secure the seat for rotation with the drum. The seat is selectively mountable in the retaining pocket with the body portion in a first orientation in which the first grip surface cooperates with the gripper to grip sheet material or in a second orientation in which the second grip surface cooperates with the gripper to grip sheet material.

Abstract: A method of releasing a sheet from a blanket cylinder of a printing machine, wherein the sheet is guided by an impression cylinder and held by grippers thereof, includes moving, with respect to the impression cylinder, elements of the impression cylinder holding the sheet, in a direction relatively counter to the direction of rotation of the impression cylinder, so as to produce an enlarged pull-off angle after a leading edge of the sheet has passed a printing nip between the blanket and the impression cylinders; and a device for performing the foregoing method. The background to the invention is the knowledge that higher tensile forces on a sheet are disadvantageous, and the object was therefore set of making available a method and a device in which the tensile force is reduced. This is achieved by means of a method in which, in order to produce an enlarged pull-off angle (.gamma.

Abstract: A cylinder of a rotary printing machine having an inner cylinder body includes an elastically deformable cylinder jacket formed as part of a circle, the cylinder jacket being substantially intrinsically rigid, and an adjusting device for acting upon the elastically deformable cylinder jacket so as to vary the outer diameter thereof, the adjusting device having a positioning part supported on and radially displaceable relative to the inner cylinder body for shifting the cylinder jacket jointly therewith in the same radial direction, and having a force deflector displaceable over a positioning travel distance derivable from the radial displacement of the cylinder jacket for acting upon the cylinder jacket so as to deform it.

Abstract: A method for eliminating a rhythmic register error in a sheet-fed printing machine with a multiple-size sheet-conveying cylinder having at least one first and one second gripper device includes varying instants of closure of the gripper devices by adjusting adjusting devices assigned to the gripper devices so as to compensate for the register error; and a device for performing the foregoing method.

Abstract: The impression cylinder (2), which together with the cylinder (1) that prints the image, forms the printing nip, co-operates with two transfer cylinders (3, 4) which feed or remove the sheets, and has an essentially closed cylindrical circumferential surface, into which, at the beginning of each impression segment, a suction strip (5, 6) is inset to apply suction to the front edge of a sheet. The two transfer cylinders (3, 4) are similarly provided with suction strips (7, 8; 13, 14) which are arranged in good register with the suction strips (5, 6) of the impression cylinder (2), and moreover have dipping grippers (10, 12; 16, 18), which are located in gaps in the dipping strips. Sheet transfer to and from the impression cylinder (2) is effected by alternately switching on and off the suction air at the relevant suction strips.

Abstract: In order to improve a gripper opening/closing mechanism of a sheet transfer cylinder in a sheet-fed printing machine in the prior art, the gripper opening/closing mechanism of the sheet transfer cylinder in the sheet-fed printing machine comprises: a plurality of grippers; a gripper shaft whereupon the plurality of grippers are disposed over specific intervals; and a cam mechanism provided at each of two ends of the gripper shaft, which cause the gripper shaft to move when the sheet transfer cylinder has rotated to a first specific position so that the grippers and the external circumferential side surface of the sheet transfer cylinder come in contact with each other and causes the gripper shaft to move in the opposite direction when the sheet transfer cylinder has rotated to a second specific position so that the grippers and the external circumferential side surface of the sheet transfer cylinder depart from each other.

Abstract: A paper guide apparatus for a sheet-fed offset printing press includes a conveying unit, a gripper unit, a paper guide member, and an inspection unit. The conveying unit conveys a printed sheet delivered from a printing unit. The gripper unit is supported by the conveying unit for gripping one end of the sheet. The gripper unit has a plurality of sets of grippers and gripper pads. The paper guide unit is arranged along a sheet conveying route to guide the sheet which is being conveyed with a guide surface arranged to be substantially flush with the gripper pads. The paper guide member has a plurality of suction holes for drawing the sheet on the guide surface by suction and a plurality of grooves formed on traveling routes of the grippers. The inspection unit inspects a printed state of the sheet which is conveyed while being drawn on the guide surface of the paper guide unit by suction.

Abstract: A thermal transfer printer comprises an intermediate transfer roller, a thermal print head for transferring portions of an ink layer formed on an ink ribbon to the circumference of the intermediate transfer roller in ink dots, and a pressure drum to be pressed against the intermediate transfer roller to transfer the ink dots from the intermediate transfer roller thereto, provided with grippers on its circumference and with end plates each having a cam section. The cam sections have a height from the circumference of the pressure drum greater than that of the upper ends of the grippers from the circumference of the pressure drum at its opposite ends to avoid the collision of the grippers with the intermediate transfer roller, and have a radially outward convex curved shape. The length of the bases of the cam sections is greater than the distance between two edges between the circumference of the pressure drum and the flat surface formed by cutting a portion of the circumference of the pressure drum.

Abstract: A sheet-guiding system for a printing press, the sheet-guiding system being disposed in the vicinity of a transfer drum located between two sheet-guiding cylinders, respectively, disposed upstream and downstream of the transfer drum, as viewed in a sheet travel direction, the transfer drum being provided with rows of grippers movable along a travel path and having at least nearly closed surfaces between the rows of grippers, including an air guide element disposed above the transfer drum at a slight spacing from the travel path of the gripper rows, the air guide element defining an air chamber at the top thereof, the air chamber extending from the upstream to the downstream sheet-guiding cylinder, and a blower device for applying air to the air chamber in a direction towards the downstream sheet-guiding cylinder.

Abstract: Gripper control for a cyclically rockingly driven pregripper for single-sheet feeding in a sheet-fed printing press, the pregripper being disposed at a free end of a rocker lever, which is swivelable about a rocker shaft fixed to a frame of the printing press, and having at least one sheet gripper forcibly movable by cams about an articulated shaft disposed parallel to the rocker shaft, for closing and opening the sheet gripper when the sheet is taken over and transferred, respectively, one of the cams being revolvable a single revolution, and another of the cams being disposed on a locally stationarily swivelable roller lever carrying a cam roller engaging with the one cam, the other cam being swivelable cyclically in the position thereof, the position of the cams determining the closing time and opening time of the gripper, includes an indexing mechanism for fixing the other cam on the locally stationarily swivelable roller lever, the other cam having a first gripper-closing cam region and a first gripper-o

Abstract: A sheet-conveying drum for use between units in a printing machine is provided with a plurality of gripper bridges arranged substantially circumferentially symmetrically on the drum surface. The gripper bridges hold the paper on the drum and include gripper impact strips that are adjustable substantially radially relative to the drum in order to accommodate printing materials of different thickness. Each gripper impact strip is adjusted by means of a positioning device that is arranged on the drum radially inward of the gripper impact strip and mounted so that it can move axially relative to the drum and cam the gripper impact strip radially. The axial movement of the positioning devices is brought about by two actuating devices which are mounted opposite each other on the side frames of the printing machine. The actuating devices are preferably pneumatic cylinders and are adapted so that when they are extended they periodically engage adapters on the free ends of the positioning devices as the drum rotates.

Abstract: A gripper device for two-dimensional products on guiding cylinders for the products, the guiding cylinders having respective end faces at which the guiding cylinders are supported in respective side frames, the gripper device including grippers disposed on a driven gripper shaft and cooperatively engageable with gripper pads of a radially movable gripper impact strip, a stop mounted on the driven gripper shaft, the stop being supported on and movable with the gripper impact strip, the products to be accepted being alignable between the gripper fingers, on the one hand, and the gripper impact strip, on the other hand, at the start of a closed stage of the gripper fingers.

Abstract: Sheet transfer drum mounted between printing units within side walls of a rotary printing press includes two gripper bars arranged symmetrically on a circumference of the sheet transfer drum so as to be located diametrically opposite one another on a y-axis of the sheet transfer drum; a drum body core formed with side surfaces extending between the gripper bars over the entire length of the sheet transfer drum within the circumference of the sheet transfer drum and having a convex curvature with a curvature gradient which is largest in the region of the x-axis and diminishes continuously towards the gripper bars.

Abstract: Overshooting-sheet safety device for sheet deliveries of printing presses includes a triggering member responsive to overshooting sheets for triggering a stoppage of the printing press, the triggering member extending across the width of an oncoming sheet and being mounted in bearings at both sides thereof, the triggering member being deflectable perpendicularly to a line connecting said bearings for triggering a stoppage of the printing press.

Abstract: The beveled ends of a flexible printing plate are clamped in a cylinder slot by a plurality of spring teeth that are receivable cutouts in the plate beveled ends. The spring teeth are part of a comb plate that is supported by a rotatable clamping lever. These teeth will also function as plate end ejectors when the clamping spindle is rotated in a plate end ejecting direction.

Abstract: A device for fastening a rubber blanket unit to a blanket cylinder utilizes a rubber blanket secured to the surface of a support plate which is provided with beveled ends. These ends are insertable into a narrow slit in the cylinder and are held in the slit by pressure elements. The beveled support plate end lateral surfaces are in contact with each other.

Abstract: A gripper cylinder configurable as a printing cylinder of a sheet-fed printing machine, a feeder drum in a sheet-fed printing machine, or a gripper cylinder in a folder unit. The gripper cylinder includes a stationary stator and a gripper spindle assembly mounted to the cylinder. The gripper spindle assembly includes a gripper pivotably mounted to a gripper support. Instead of using a mechanical cam, the gripper can be controllably pivoted together with a cam roller by an armature that can be magnetized but is not permanently magnetic when an electric current flows through the stator thereby magnetizing a housing of the stator. The armature may be magnetically urged against the restoring force of a spring.

Abstract: A sheet-conveying drum for a printing machine with speed apart bearings, the drum including a drum body with a prismatic shape including end faces and side faces, drum journals secured to the end face for journalling the drum for rotation in the bearings, at least two gripper bridges extending between the end faces and disposed symmetrically about the periphery of the drum body, the side faces including communicating openings extending into and through the drum body for allowing the flow of air therethrough as the drum rotates.

Abstract: A plate end of a flexible printing plate is clamped or retained in a narrow slit in the surface of a plate cylinder. A rotatable spindle is situated adjacent a radial inner end of the cylinder slit. This spindle carries a group of pressure elements having pressure cams that are engageable with the plate ends during rotation of the spindle and which secure or clamp the plate ends in the narrow cylinder slit.

Abstract: A plate end of a flexible printing plate is released or ejected from a narrow slit in the surface of a plate cylinder. A rotatable spindle is situated adjacent a radial inner end of the cylinder slit. This spindle carries a group of resilient ejectors having free ends that are engageable with the plate ends during rotation of the spindle and which push the plate ends out of the narrow cylinder slit.

Abstract: A plate clamping device which is usable to secure at least one end of a flexible plate to a cylinder utilizes a group of spring fingers that are shiftable radially in an axially extending slit in the cylinder to engage apertures in the end of the plate. The spring fingers have barbs that are receivable in these plate end apertures. The spring fingers are shiftable radially in the cylinder slit by rotation of a spindle situated in the cylinder.

Abstract: A method and apparatus that uses chain delivery system to deliver printed sheets to one of two sheet stacks is disclosed. The sheets are grasped by chain gripper systems and are transported along an upper chain strand. A transfer cylinder is positioned in the path of sheet travel between the two sheet stacks. Sheets destined for the second sheet stack are removed from the upper chain strand by the transfer cylinder and delivered to the second sheet stack by a lower chain strand.

Abstract: Sheet guiding cylinder of a printing press includes a cylinder casing rotatable about an axis of rotation, and having an outer cylindrical surface defining a skeletal framework; the skeletal framework being formed by guide vanes extending in longitudinal direction of the sheet guiding cylinder and having a curved guide vane profile disposed in planes perpendicular to the axis of rotation, the guide vanes beginning from respective locations radially inward from the outer cylindrical surface and terminating substantially radially in an imaginary cylindrical envelope surface enveloping the outer cylindrical surface and being symmetrical with the axis of rotation.

Abstract: A sheet-conveying drum for use between units in a printing machine is provided with a plurality of gripper bridges arranged substantially circumferentially symmetrically on the drum surface. The gripper bridges include gripper impact strips that are adjustable substantially radially relative to the drum in order to accommodate printing materials of different thickness. Each gripper impact strip is adjusted by means of a positioning device that is arranged on the drum radially inward of the gripper impact strip and mounted so that it can move axially relative to the drum and cam the gripper impact strip radially. The axial movement of each positioning device is brought about by an adjusting means which is selectively operated by a drive that is disposed in one of the drum journals.

Abstract: Mounting arrangement of the bars supporting the grippers in a map-making or security-paper printing machine, wherein each bar consists of a pair of parallel tubular rods and is supported at its opposite ends on two transport chains slidable along two parallel fixed guides, each bar end being mounted on a pair of pins fixed to the chains and projecting therefrom towards the bar. Between the bar ends and the pairs of support pins there is interposed an intermediate support, formed by two elements adapted to slide telescopically one in respect of the other in a direction parallel to the sliding plane of the chains and lengthwise of the chains, one of these elements, in the form of a plate, comprising two transverse bores to house the pins of the chain, while the other element, in the form of a slide, is fixed to an end of each bar and is slidably mounted on the plate.

Abstract: A sheet-conveying drum for use between units in a printing machine is provided with a plurality of gripper bridges arranged substantially circumferentially symmetrically on the drum surface. The gripper bridges hold the paper to the drum and include gripper impact strips that are adjustable radially relative to the drum in order to accommodate printing materials of different thickness. Each gripper impact strip is adjusted by means of a positioning device that is arranged on the drum radially inward of the gripper impact strip and mounted so that it can move axially relative to the drum and cam the gripper impact strip radially. The axial movement of each positioning device is brought about by an actuating device which is preferably a pneumatic cylinder and is disposed on the body of the drum at the free end of each positioning device. An energy supply sequentially actuates each actuating device resulting in the piston of each cylinder either extending or retracting.

Abstract: Grippers for sheet-fed printing presses having gripper seats arranged on a gripper bar housing, gripper finger supports with gripper fingers swivellably carried by a gripper shaft adjacent the gripper bar housing, a drive acting via the gripper shaft, springy elements for determining a closing force of the grippers, and entrainer pins carried by the gripper shaft and engaging in slots formed in the gripper finger supports.

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: An image printing apparatus having high quality image printing capability due to minimized registration errors is provided. The image printing apparatus has a thermal head 18 and a platen roller 15 which is shorter in its circumference than the length of a pro-cut print medium 2 to be printed. An image is printed on the print medium by transporting the print medium and a ink ribbon 23 between the thermal head and the platen roller. A pair of clamp rings 3, 3 are rotatably and respectively provided approximately along both sides of the print medium, and each clamp ring has a circumference being same to or longer than the length pre-cut print medium, and has an internal gear 3b1. A clamper 5 is installed to connect the clamp rings together, and rotates with the print medium being clamped thereby. A capstan roller 7 is installed between the clamp rings and connected to a drive motor 8 to rotate constantly.

Abstract: Device for connecting a machine element to a structural member, which is movable about a longitudinal axis thereof, so that the machine element and the structural member are secured against relative rotation, includes a tension band firmly connected to a machine element and embracing more than 180.degree. of a circumference of the structural member, and a thrust piece having an inner side matching the circumference of the structural member, the thrust piece extending across a part of the circumference of the structural member other than a part thereof embraced by the tension band, and at least one clamping device to which the tension band is fixed for radially clamping the thrust piece against the structural member.

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: To make it possible that the leading end of the stencil proceeds beyond the stencil leading end mounting device toward the stencil exhausting means in the process of exhausting the stencil even when the space required for the open/close operation of the stencil leading end mounting device for mounting the leading end of the stencil to the printing drum of the rotary stencil printer is made small, a snap-up member 84, 86 and 88 is provided adjacent inlet edge of an open/close type clamp member 76 of the stencil leading end mounting device so that the leading end 116 of the stencil released from the clamping by the clamp member 76 in the process of exhausting the stencil is snapped up to the upper side of the clamp member 76.

Abstract: Pregripper of a sheet-fed printing press includes a drive unit for pivotally driving a pregripper bar secured to a pregripper support device, the drive unit having main and auxiliary cam elements disposed on a drive shaft so as to be fixed against rotation relative thereto, and cam follower members cooperatively engaging with the cam elements so as to produce a movement of the pregripper bar, the pregripper support device engaging the pregripper bar approximately centrally for introducing a force to produce the pivoting movement.

Abstract: Adjusting device for a gripper opening cam in a chain delivery for delivering sheets in a sheet-fed printing press, wherein grippers disposed on gripper carriages of endlessly revolving chains have a cam roller running onto the gripper opening cam for opening the grippers, includes an adjusting shaft journalled in a press frame and having an axis, a lever arm swivellable about an axis transverse to the axis of the adjusting shaft and articulatingly connected to the gripper opening cam, and a linkage for converting rotation of the adjusting shaft into swivelling of the lever arm, the linkage being formed of a combination of a left-hand and a right-hand thread, the adjusting shaft being formed at opposite ends thereof with respective spindle threads of mutually opposite pitch, a spindle nut fixedly disposed on the press frame and a spindle nut connected to the lever arm, the spindle nuts being formed with threads of mutually opposite pitch, the adjusting shaft being screwable by the respective spindle threads t

Abstract: A plate cylinder of a rotary printing press having a cylindrical outer surface which forms a resting surface for a printing plate which is to be clamped thereon, and having a receiving gap which is open towards the outer surface and extends transversely to the circumferential direction of the cylinder, within which gap there is a clamping device for the printing plate which has a displaceable clamping element, is disclosed. This clamping element is displaceable, for the fastening or loosening of the printing plate, along a path concentric to the axis of rotation of the plate cylinder in the circumferential direction of the cylinder.

Abstract: In order to ensure that the leading end of a print sheet mounted to the back press means by a clamp member is engaged by a claw member for removing the print sheet from the back press means when the leading end has been released from the clamping by the clamp member, there is provided a means for lifting up the leading end of the print sheet above a supporting surface therefor of the back press means after the release of the leading end from the clamp member.

Abstract: A protective sheet protects a recording surface of a recording sheet. Plural recording sheets are stacked with the recording surface of the recording sheets oriented toward the protective sheet. The recording sheet is fed for recording while an advancing edge of the recording sheet is advanced. The protective sheet includes a discriminative mark, disposed away from the advancing edge and on a surface oriented opposite to the plural recording sheets for signaling presence of the protective sheet. For use with those sheets, a printer records with a thermal head on a recording surface of a recording sheet set on a platen drum in rotation of the platen drum. The advancing edge is clamped by a clamper on the platen drum. The recording sheets and the protective sheet are fed one after another toward the platen drum, to pass the advancing edge of the one fed sheet inside the clamper. The advancing edge at the clamper is detected by the position sensor.

Abstract: There are method and apparatus for automatically clamping and cinching a flexible sheet medium on a rotatable supporting surface with clamping and cinching forces which independently increase as function of the rotational speed of the support surface. The clamp applies such forces to at least one edge of the sheet medium in a manner so that the sheet edge will not bend or push the sheet edge away from a pivot axis of the clamp so as to reduce sheet medium separation.

Abstract: A folding cylinder for a web-fed rotary printing press is provided with signature end engaging point spurs. The cylinder is also provided with signature grippers which will engage the signature end or sides so that the point spurs can be retracted at a slower rate of speed to thereby avoid damaging the signature end.

Abstract: In a sheet gripper for a sheet-processing machine, a swingable gripper arm has at one of its ends a gripper tip which can be pressed against an abutment and, at its other end, a spring section which is bent back towards the gripper tip in the manner of a bent leaf spring and connects the gripper arm to a gripper shaft. The gripper arm is of substantially inflexible construction. The bent-back spring section and the gripper tip lie on opposite sides of a plane which extends substantially perpendicular to the gripper arm and radially of the gripper shaft. The bent-back end of the spring section forms an attachment arm which rests, with a contact surface adapted to the curvature of the gripper shaft, on the side of the gripper shaft facing the gripper arm and is releasably attached to the gripper shaft by means of a screw.

Abstract: Device for stiffening a rotary printing press having at least one stock-conducting printing-unit cylinder cooperating with at least one ink-conducting transfer cylinder disposed in accordance with a satellite formation, the cylinders being journalled in side walls of the rotary printing press, includes a stiffening member passing through a hollow space formed in the printing-unit cylinder and having respective end regions, and adapters secured to the side walls wherein the printing-unit cylinder is journalled, the respective end regions of the stiffening member being connected to the adapters, respectively.

Abstract: A sheet-guiding drum for use in printing machines and having gripper links spaced uniformly around the periphery of the drum. Gripper contact strips of the gripper links are adjusted uniformly in order to accommodate different printing material thicknesses. Such adjustment is achieved by the provision of a drive motor in the journal of the drum, the drive motor being connected by a coupling to adjusters which extend radially from the center of the drum. Each adjuster moves a rod axially of the drum and effects radial adjustment of the associated contact strip by virtue of co-acting wedges carried by the rod and the contact strip.

Abstract: A cylinder for a rotary printing press is provided with a press blanket clamping device that is usable to secure the ends of the press blanket to the cylinder. A blanket end ejection device is used to dislodge an edge strip of a blanket leading edge from an edge strip receiving groove portion of the clamping device. The ejection device uses one or more ejection pins and cooperating leaf springs to position the edge strip during its insertion and ejection into and from the press blanket clamping device.

Abstract: Printing machine with a sheet-guiding surface, at least part of which is a cover surface of a pneumatic-flow box, the cover surface being formed with pass-through openings for pneumatic fluid, includes a pneumatic-flow nozzle connecting the pneumatic-flow box to a source for supplying pneumatic fluid to the pneumatic-flow box, the pneumatic-flow box having a flow resistance profile decreasing therein with increasing distance from a location at which the pneumatic-flow nozzle is connected to the pneumatic-flow box.

Abstract: Cam-oscillating drive which operates to compensate for the cyclically occurring variations in the course of the drive moment by means of at least one cam disc mounted on the drive shaft and a rolling cam follower in engagement with the cam disc, wherein the cam follower has an oscillating part with an oscillating mass driven by the cam follower, and wherein the oscillating part has a curved section that cooperates with a curve roller and a potential energy storage such that the kinetic energy of the oscillating part is stored in the potential energy storage during the deceleration phase, while during the acceleration phase the energy is again drawn from the potential energy storage.

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 printer accurately controls the passage of print media therethrough and maintains the print media taut as the print media passes through a printing zone while the media is printed by an ink jet printer. The print media sheet is preferably carried by a rotating drum in a first direction through the printing zone, with the drum being reversed to cause the exiting of the print media sheet from the printer. A pressure fixing or fusing apparatus may be positioned to flatten ink spots on the print media as the print media exits from the printer. The pressure fixing or fusing mechanism is preferably used in the case of a hot-melt or phase-change ink jet printer.

Abstract: A printer for printing characters and images on recording paper comprising: a paper cassette for storing the recording paper; a platen roller around which the recording paper is wound at the time of the transfer of images for printing; a clamping mechanism for clamping the recording paper between the clamping mechanism and the platen roller; a motor for driving the platen roller through a gear unit; a thermal printing head for transfferring images onto the recording paper; a paper feeding rollers for feeding the recording paper from the paper cassette to the clamper; a paper discharging rollers for discharging the recording paper upon the completion of the transfer of images thereto; and an ink cassette storing an ink sheet inside thereof; in which the clamping mechanism comprises a clamper which is mounted on the platen roller in such a manner as to permit the free movement of the clamper, holds the recording paper by pushing the recording paper onto the platen roller in a first position and also releases th

Abstract: A printing machine plate cylinder having a plate tensioning slide rail adjustably mounted within a hollow of the cylinder. The slide rail is supported by a plurality of roller ring modules which stably support the slide rail and permit easy and exact movement of the slide rail in any direction in the adjusting plane.