Abstract: An image forming apparatus that facilitates user's determination of necessity of setting an inspection resuming page and is improved in jam processing efficiency. A sheet having an image formed thereon by an image forming unit is conveyed along a sheet conveying path. A sheet inspection device inspects the image on a sheet being conveyed through sheet conveying path. When a jam occurs in the conveying path, image formation by the image forming unit is interrupted. When jammed sheets are removed, formation of images including those formed on the jammed sheets is resumed. When a leading one of the jammed sheets is on a downstream side of the sheet inspection device, the image formation is resumed from an image formed on the leading jammed sheet, based on a user instruction.

Abstract: A cam follower is affixed to a rotary component that is in mechanical communication with a rotary source such that the cam follower travels along a path when the first rotary source is operating. The cam follower is in mechanical communication with a mechanical component such that, when the cam follower is engaged with a retract dwell section of either of a dynamic cam or a static cam, the mechanical component is retracted. The static cam may be positioned to allow the mechanical component to retract for a predetermined portion of the path.

Abstract: A method for setting position register and color register in a sheet-fed printing press having a control computer, which provides for one setting operation, in which both position and color register are set by the control computer. For the purposes of the setting, both the register setting elements in the printing units and the setting elements in the feeder are used. The invention is distinguished by the fact that before carrying out the setting operations, during the calculation of the travels for the register setting elements and setting elements in the feeder, an optimization comprising the travels of the register setting elements and the setting elements in the feeder is carried out in the computer.

Abstract: A printing device for printing on a printable media. The printing device comprises a rotating component (1), a gripper mechanically coupled to the rotating component (1) and configured for loading and unloading the printable media to and from the rotating component (1), an actuating element (5) configured for actuating the gripper, the actuation resulting in a disturbance to the rotation of the rotating component (1), and a compensating element (6) shaped such as to reduce the disturbance by applying a compensating mechanical force to the rotating component (1) during the rotation of the rotating component (1).

Abstract: An adaptable impression drum configurable to handle either B1 or B2 sized substrates in a manner utilizing the majority of available circumferential surface area of the drum body.

Abstract: An image forming apparatus includes: an image carrier that is rotatably arranged and carries an image on an outer circumferential surface thereof; a transfer member that is rotatably arranged to face the image carrier and transfers the image carried on the image carrier onto a sheet held between the transfer member and the image carrier; a leading edge gripping member that is secured to the transfer member and grips a leading edge side of the sheet in a transport direction thereof on an outer circumferential surface of the transfer member; and a trailing edge holding member that is arranged to be rotatable around the transfer member, holds a trailing edge side of the sheet in the transport direction thereof between the trailing edge holding member and the outer circumferential surface of the transfer member, and bends to release the trailing edge side of the sheet in the transport direction thereof.

Abstract: This invention discloses a sheet processing apparatus including a sheet supply device, a first cylinder which includes at least one gripper device, a processing device, a sheet discharge device, and conveyance devices. The conveyance devices include a plurality of gripper devices including at least one reversing gripper device. The conveyance devices also include a second cylinder and reversing swing arm shaft pregripper. The second cylinder grips and conveys one edge of the sheet by one gripper device of the plurality of gripper devices. The reversing swing arm shaft pregripper is supported to be swingable between the first cylinder and the second cylinder, receives by the reversing gripper device the other edge of the sheet conveyed by the second cylinder, and transfers the received other edge of the sheet to the gripper device of the first cylinder by a gripping change.

Abstract: A mechanism includes an impression member having an impression surface and impression media covering a portion of the impression surface. In one embodiment, the impression media includes one or more apertures. In one embodiment, the impression media is held by an impression media holding mechanism.

Abstract: A transfer drum between printing units in a sheet-fed printing press includes gripper systems which can be switched to a desired mode of operation by simple measures and ensure stable and reliable transport of a sheet between printing units when in a respective operating position. A drum body has journals for supporting the drum body in side walls and two gripper systems provided on the drum body. The gripper systems are radially extendable into an operating position depending on a selected mode of operation for printing on only one side or for printing on both sides of the sheet. The gripper systems are disposed diametrically opposite each other relative to an axis of rotation of the drum body and are attached to a support disposed in the drum body to move in radial direction.

Abstract: An apparatus for turning a sheet during transport through a printing press provides better printed results as a result of improved sheet guidance. A transfer drum has gripper systems disposed in channels for holding the sheet at the leading and trailing sheet edge, and guide elements covering the channels.

Abstract: A method and a device for converting a mode of operation from straight printing to perfecting in a sheet-processing machine, includes a cam/follower control for operating a gripper system, in which cam followers are maintained in a position in which they are disengaged from control cams before a conversion of the mode of operation is performed. The method and the device convert a gripper system of a reversing drum between a straight or one-sided printing mode and a perfecting or recto-verso printing mode, by controlling pivoting and opening movements of grippers of the gripper system with a control cam. Initially, a cam follower is locked in a position in which it is disengaged from the control cam. Subsequently, a further cam follower is locked in a position in which it is disengaged from a further control cam. Then the gripper system is converted.

Abstract: In an apparatus for correcting a position of a sheet which is transported in the grip of grippers on a feed drum of a sheet processing machine, in particular a sheetfed rotary printing press, provision is made for a gripper device of the drum to be mounted in independently rotatable arranged supports and for it to be possible for each support to be driven by a step-up gear mechanism.

Abstract: An apparatus for transporting sheets to or in a sheet-processing machine includes a gripper device having at least one gripper with a gripper housing and a gripper pad. The gripper is actuatable by a pivoting movement of a gripper shaft. The gripper housing and the gripper pad are pivotably disposed on the gripper shaft and are jointly pivotable about an axis of the gripper shaft under a prescribed periphery.

Abstract: A device for transporting sheets in recto or verso printing operation has tongs grippers each with upper and lower grippers. The upper gripper, or rigid gripper, that forms the gripper pad can be locked directly or indirectly in recto printing operation.

Abstract: The present invention aims at full-automatic adjustment apparatus for gripper-base height in regularly engaging condition without clutch means. Apparatus according to the invention comprises operation shaft 28 which is co-centered with cylinder axis 16 and is movable in the axial direction of cylinder; the shaft being equipped with rack portion 32 at optional position in the axial direction of cylinder and rotation engagement portion 36 at the extruded end from cylinder axis; adjustment shaft 54 which is rotary provided at the optional position in the axial direction of cylinder to the radial direction and is rotated upon receiving the force from the rack portion 32; the shaft 54 being connected by way of rotation displacement means 58 to gripper-base 22 which is adjustably provided in the radial direction; and drive means 44 which is connected to said rotation engagement portion 36 and moves said operation shaft 28 in the axial direction of cylinder.

Abstract: A printing press includes: a printing unit which performs offset printing on a sheet; a machining unit including a rotary die which performs a punching process for the sheet subjected to the printing by the printing unit; a first motor which drives an impression cylinder and the like of the printing unit; a second motor which drives the rotary die and the like of the machining unit; and a control device which controls the drives of the first motor and the second motor to be synchronized with each other.

Abstract: A method and an apparatus for turning a sheet during its transport through a printing press permit improved printing results as a result of improved sheet guidance. A sheet is tautened following a transfer from a first transport device to a second transport device.

Abstract: A sheet-fed offset printing press for printing on both sides of sheets has a compact construction and permits a number of color separations to be printed over one another in recto printing or recto and verso printing in a flexible manner and with high print quality. A plurality of printing units, which are disposed behind one another, each include at least one form cylinder, a transfer cylinder, a first impression cylinder and an inking unit having at least one ink applicator roll associated with the form cylinder. A second impression cylinder, which interacts with the transfer cylinder and the first impression cylinder, is provided in at least one printing unit.

Abstract: A mechanism for transferring an image from a first surface to printing media comprising: an impression member having an impression surface; printing media grippers associated with said impression surface adapted for holding an edge of the printing media on the impression member during said transfer and then controllably releasing the printing media after transfer; impression media held on the impression surface such that the impression media extends past the edge of the printing media held by the printing media grippers.

Abstract: It is an object of the present invention to provide a sheet-fed printing press that prevents occurrence of troubles, such as damages of a surface treatment member such as a film for the surface treatment of, for example, a sheet of paper, by a simple structure. A gripping surface of a claw block provided in a cylinder of a treatment section is formed into an inclined surface that comes closer to the rotational axis as it advances downstream in a sheet conveying direction of the cylinder, so as not to have the gripper of the cylinder contacting the treatment means. A gripping surface of a claw block provided in a cylinder most adjacent to the treatment section, of plural cylinders, is formed into an inclined surface that, projects further through an outline of this cylinder as it advances downstream in the sheet conveying direction.

Abstract: A process provides for the safe operation of a printing machine. The printing machine has a first cylinder driven by a first motor, and a second cylinder driven by a second motor. The first cylinder accepts sheets of paper from the second cylinder or delivers them to the second cylinder by a gripper system. In the case of a deviation in the synchronized running between the cylinders, the gripper system is retracted at least in part far enough into the first cylinder that the possibility of a collision of the gripper system with the second cylinder is eliminated.

Abstract: In a device for changing over a gripper control in a turning configuration of a sheet-processing machine, there is provided a slide to be guided axially displaceably by radial stops. The device changes over a gripper control from recto printing to verso printing on a transfer device such as a drum or a cylinder of a turning configuration in a sheet-processing machine.

Abstract: The present invention aims at providing a gripper-base mechanism which is suitable for automatic and fine adjustment of gripper-base height, superior in durability and easy for manufacturing. In the gripper-base mechanism according to the invention, rotation displacement means 28 by screw mechanism is disposed between an adjustment shaft 24 which is provided in the radial direction within a sheet transfer cylinder 10 and a gripper-base bar 12 whose height can be adjusted in the radial direction of sheet transfer cylinder 10. A screw-base 32 which composes the rotation displacement means 28 has two male screw portions 38, 40 with oppositely directed thread and is key-jointed with one end of the adjustment shaft 24. Additionally, a tool receiving portion 46 is formed between two male screw portions 38, 40 and the gripper-base bar 12 is always spring-loaded by a spring member 50 in the direction of the adjustment shaft 24.

Abstract: An apparatus and method for retaining individual sheets of substrate in a curved configuration during coating or printing is disclosed.

Abstract: A reversing gripper system of a sheet-processing machine includes respective drive motors for driving cooperating fixed grippers and spring-loaded grippers to create pivoting and opening movements. The motors may be stationary or may be disposed inside the periphery of a reversing drum. A transmission between a drive motor and the gripper system preferably includes a belt drive. A reversing drum, a printing press and a method of automated electronic adjustment of a gripper position and of gripper opening and closing times, are also provided.

Abstract: A sheet convey apparatus for a sheet-fed offset rotary printing press with a convertible mechanism includes a gripper device and a gripper pad shaft. The gripper device swings between a first position to receive a sheet from a chucking cylinder on an upstream side in a sheet convey direction and a second position to transfer the sheet to a gripper device on a downstream side in the sheet convey direction. The gripper pad shaft extends in a widthwise direction of the sheet and pivots together with the gripper device. A position of a rotating shaft axis at an intermediate portion of the gripper pad shaft is set within a range of an angle which is formed by a line that connects rotating shaft axes at two ends of the gripper pad shaft and a sheet holding position of the gripper device at the first position and a line that connects the rotating shaft axes at the two ends of the gripper pad shaft and a sheet holding position of the gripper device at the second position.

Abstract: A sheet-fed rotary printing press for selective recto printing and recto and verso printing includes a three-drum reversing device having three cylinders cooperatively disposed behind one another between respective impression cylinders of two adjacent printing units. The three cylinders include one at least double-size transfer cylinder, one at least double-size storage drum, and one at least single-size reversing drum. Grippers prescribe a circular periphery of the transfer cylinder. The transfer cylinder has an outer contour smaller than the circular periphery prescribed by the grippers of the transfer cylinder. Other grippers prescribe a circular periphery of the reversing drum. The reversing drum has an outer contour smaller than the circular periphery prescribed by the grippers of the reversing drum. A method of operating the three-drum reversing device is also provided.

Abstract: A method of varying a drum profile of a vario drum for transporting printing material sheets, in which shell segments of the vario drum are pivoted inward and outward. Sheet supporting elements assigned to the shell segments are reversibly deformed by pivoting the shell segments. A vario drum suitable for implementing the method and a machine containing the vario drum for processing printing material sheets contain the shell segments and the associated sheet supporting elements.

Abstract: Devices for turning sheets in a rotary printing machine are described. The devices have a storage drum for handling sheets, which are each held by a holding device, and a turning drum is disposed downstream of the storage drum and has a holding device for engaging a rear edge of the sheet to be turned. An operation of detaching the sheet to be turned from the storage drum and carrying it along by the turning drum leads to the formation of a pressure reduction in an area formed between the sheet to be turned, the storage drum and the turning drum. The pressure reduction is compensated for by supplying ambient air, blast air and/or compressed air. The turning device has a channel and/or a passage orifice connected to an inner chamber of the turning drum. Via the channel and/or passage orifice air can be sucked and/or blown into the reduced-pressure area.

Abstract: A machine for processing sheets of printing material has a cylinder for transporting the sheets and sheet supports which are mounted such that they can be rotated about a sheet support axis of rotation and in each case contain supporting segments for pressing the sheets onto the cylinder. The supporting segments are mounted such that they can be pivoted as desired into an active position and into a passive position about pivot axes that are skewed relative to the sheet support axis of rotation or about rotary joints determining the pivot axes.

Abstract: The invention concerns a digital printing machine for sheet printing with a digital printing mechanism with free format in the peripheral direction, an intermediate cylinder which is connected downstream of the digital printing mechanism and is at least partially coated with an elastic material, and a counterpressure cylinder which is connected downstream of the intermediate cylinder, wherein the counterpressure cylinder has grippers holding the sheet and the intermediate cylinder periphery is provided with recesses for receiving the grippers.

Abstract: Gap guards are attached to a notch of an impression cylinder in such a manner as to allow grippers to project from inside the notch, and have respective guide surfaces. The guide surfaces extend between a circumferentially first end portion and a second end portion of the notch and have a curvature substantially equal to that of the outer circumferential surface of the impression cylinder. The guide surfaces are flush with the outer circumferential surface of the impression cylinder at the second end portion, whereas a clearance is formed between the guide surfaces and the outer circumferential surface of the impression cylinder at the first end portion. Grippers have respective guide surfaces. The guide surfaces have a curvature substantially equal to that of the outer circumferential surface of the impression cylinder such that the guide surfaces are flush with the outer circumferential surface of the impression cylinder at the first end portion.

Abstract: A cylinder apparatus includes a cylinder body, support member, shaft, coned disc spring, air cylinder, and levers. The cylinder body is rotatably supported by a pair of frames. The support member is supported to be movable in a circumferential direction with respect to the cylinder body, and supports a suction head. The shaft is supported to be movable in an axial direction of the cylinder body. The coned disc spring biases the shaft in a first direction. The air cylinder moves the shaft in a second direction opposite to the first direction against an elastic force of the coned disc spring. The levers are swingably supported by the cylinder body and swing upon movement of the shaft to fix/release the support member with respect to the cylinder body.

Abstract: In a method of operating a machine processing printing material sheets and having a sheet transport drum in various operating modes, drum circumferential shells are kept fixed on the sheet transport drum in an outer position in a first of the operating modes and in an inner position in a second of the operating modes. During a drum conversion to be carried out before the start of a third of the operating modes, the drum circumferential shells are removed from the sheet transport drum and, in this third operating mode, the sheet transport drum is rotated without the drum circumferential shells.

Abstract: A printing machine having at least one roller and at least a first and a second functional element for executing cyclic movements synchronized with a rotational movement of the roller and driven, together with the roller, by a drive unit, includes spring elements, respectively, assigned to the functional elements, the spring elements being stressed in one phase of the cyclic movement and relieved of stress in another phase of the cyclic movement, respectively, a phase wherein a first one of the spring elements is stressed being synchronized with a phase wherein a second one of the spring elements is relieved of stress.

Abstract: Apparatus for duplex printing comprising: a first impression roller (24) on which a first side of a sheet (22) having a leading edge and a trailing edge is printed referenced to the leading edge; a second impression roller (26) on which a second side of the sheet is printed; and a transport system (20) that removes a printed sheet from the first impression roller (24) and transports it to the second impression roller (26), the transport system comprising a perfector (32) that receives the sheet and grips it along both the leading and trailing edges of the sheet, which perfector turns the sheet over and transfers the sheet trailing edge first towards the second impression roller.

Abstract: A plate cylinder of a printing press, with a tensioning channel which extends in the axial direction, in which means for fixing the plate ends of at least one printing plate which can be positioned on the plate cylinder are arranged. The leading plate end can be fixed by a holding element against a contact surface by means of a tensioning rail which can be moved in the tensioning channel. After that, and after the plate cylinder has been rotated, it is then possible to hook the trailing plate end on the extended tensioning rail. After that, it is possible to draw the tensioning rail back in again to tension the trailing plate end.

Abstract: A quality inspection apparatus for a double-sided printing machine which includes a rubber impression cylinder and a rubber cylinder; inking unite for supplying ink to the rubber impression cylinder and the rubber cylinder; and a transport mechanism for transporting the printed paper to a delivery unit. The transport mechanism includes first through third transport cylinders for transporting the paper from the first delivery chain, and a delivery chain for transporting the paper from the first through third transport cylinders. The quality inspection apparatus includes an inspection camera for detecting a status of printing on one face of the paper when transported by the first transport cylinder, and an inspection camera for detecting a status of printing on the other face of the paper when transported by the second transport cylinder.

Abstract: The invention relates to a guiding device for metal sheet printing machines and metal sheet painting machines, which have at least two printing cylinders and a transfer drum situated therebetween. The guiding device is arranged on said transfer drum and, to be precise, is located close to the imaginary cylindrical outer surface of the transfer drum. The guiding device comprises at least one guiding element with an outwardly turned bearing surface for supporting the rear edge of the metal sheets. The guiding element is pivotally mounted by means of a swivel bearing whose pivotal axis is parallel to the axis of the transfer drum. The guiding element is coupled to a pivot drive by means of which its bearing surface can be adjusted to different pivoting angles (?) with regard to the tangent to the imaginary cylindrical outer surface of the transfer drum.

Abstract: A device for locking, with respect to a first power transmission element, a further power transmission element that is lockable in a rotational position thereof, provides for the first and the further power transmission element to have a common working chamber with a variable volume to which a pressure medium can be applied, it being possible for the pressure medium in the working chamber to be solidified by applying an electric voltage or a magnetic force field thereto.

Abstract: A reversing or turning assembly of a sheet-processing machine includes an impression cylinder having a circumferential surface for transporting sheets thereon for printing the sheets in a printing nip associated with the impression cylinder. Gripper devices are provided for gripping the printed sheets at a respective trailing edge thereof and for lifting the gripped sheets off the impression cylinder for reversing the gripped sheets. The circumferential surface of the impression cylinder is formed with recesses in a region thereof occupied by the trailing edge of the sheets, for permitting the gripper devices to penetrate or dip into the recesses to grip the sheet trailing edge. The recesses have a position being variable in circumferential direction of the circumferential surface of the impression cylinder for adapting to different sheet formats.

Abstract: A printing machine, which includes at least two printing unit groups having drives which are decoupled from one another and assigned, respectively, to one printing unit group, and having printing units with transfer cylinders, include compensation elements for compensating for speed differences and positional errors between two printing unit groups. The compensation elements are assigned to a printing unit group which is an accepting printing unit group, in order to compensate for transfer errors.

Abstract: Devices for turning sheets in a rotary printing machine are described. The devices have a storage drum for handling sheets, which are each held by a holding device, and a turning drum is disposed downstream of the storage drum and has a holding device for engaging a rear edge of the sheet to be turned. An operation of detaching the sheet to be turned from the storage drum and carrying it along by the turning drum leads to the formation of a pressure reduction in an area formed between the sheet to be turned, the storage drum and the turning drum. The pressure reduction is compensated for by supplying ambient air, blast air and/or compressed air. The turning device has a channel and/or a passage orifice connected to an inner chamber of the turning drum. Via the channel and/or passage orifice air can be sucked and/or blown into the reduced-pressure area.

Abstract: A recto and verso printing press, comprising an upper gripper and a lower gripper, respectively, centrally pivotable with respect to an introduction of force, said upper gripper, in recto printing position thereof, being cooperable with a gripper pad fixed to a cylinder of the printing press, said upper gripper and said lower gripper being arranged centrally in relation to one another and to said gripper pad, and having a common center line.

Abstract: There is provided a double-sided printing press that includes a sheet-turning-over mechanism for turning sheets upside down at a sheet-turning-timing according to a set length of sheets, which has been previously set for the sheet-turning-over mechanism; and a sheet-length-detection means for detecting the length of sheets, which are fed to the sheet-turning-over mechanism; wherein where the length of sheets, which are fed to the sheet-turning-over mechanism and detected by the sheet-length-detection means, is deferent from the set length of sheets as a result of comparison therebetween, the sheets are stopped from being transferred to the sheet-turning-over mechanism.

Abstract: An apparatus for guiding and transferring a sheet in a printing machine from a first cylinder to a gripper of a second cylinder in which the apparatus has a guide device for a holding element, which is held outside the first and second cylinder. In this way, the design of the guide apparatus can be independent of the first and second cylinders. In addition, a longer time period is available for gripping, tensioning and transferring the sheet. The apparatus can be used both in a recto printing machine and in a turner device in recto and verso printing.

Abstract: A device includes a cylinder having a gripper system for holding a sheet of printable material, the gripper system having at least one gripper mounted so as to be pivotable relative to at least one gripper support and being capable of performing a dipping movement into a channel formed in the cylinder below an outer jacket contour thereof, and having a control cam for controlling the pivoting of the gripper relative to the gripper support, the control cam also serving to control the dipping movement of the gripper system into the channel.

Abstract: A paper discharging apparatus, which is provided in a printing machine, for transferring sheets of paper having different thickness. The paper discharging apparatus has a first gripper unit fixed in a groove, which extends along the cylindrical surface of a printing cylinder, and a second gripper unit, which moves along a discharging rail. The second gripper unit has a gripper and a base to hold the sheet. The position of the base is adjusted in accordance with the thickness of the sheet. A relatively thin sheet of paper is held by the first gripper unit and a relatively thick sheet of paper is held by the second gripper unit.

Abstract: A sheet-fed rotary printing press with a convertible mechanism includes a convertible cylinder, a plurality of gripper units, a plurality of holding members, a convey mechanism, and a pair of paper guide members. The convertible cylinder conveys a sheet. The gripper units are arranged on an outer surface of the convertible cylinder and lined up in an axial direction of the convertible cylinder, and grip the sheet. The holding members are arranged on the outer surface of the convertible cylinder to be adjacent to the gripper units, and lined up in the axial direction of the convertible cylinder to be phase-shifted from the gripper units. In single-sided printing, the convey mechanism conveys the sheet fed from an upstream convey cylinder by gripping its leading edge upon opening/closing operation of the gripper units.

Abstract: An offset printing machine including an impression cylinder, a sheet feed cylinder and a blanket cylinder. An outer peripheral surface of the blanket cylinder is divided into a plurality of color sections in a circumferential direction thereof, and an outer peripheral surface of the sheet feed cylinder has a peripheral length equal to the circumferential length of each color section. A sheet held in the sheet feed cylinder is transferred to the impression cylinder each time the sheet feed cylinder rotates a predetermined number equal to the number of the color sections. One of impression cylinder grippers and a sheet feed cylinder gripper intermittently confront with each other upon rotation of these cylinders.