Abstract: An optical time domain reflectometer for determining properties of an optical transmission fiber, the optical time domain reflectometer comprising an electro-absorption modulator comprising a waveguide and two electrodes, wherein the waveguide is arranged between the electrodes, a light source configured for emitting sampling light into the waveguide, wherein the waveguide is connected or to be connected between the fiber and the light source, and a control unit for controlling the operation of the light source and a modulation voltage between the electrodes. The electro-absorption modulator is capable of assuming an absorption state, wherein the electro-absorption modulator is further configured for receiving reflected light pulses resulting from the reflection of the pulses of sampling light in the fiber, wherein the absorption of reflected light pulses in the electro-absorption modulator results in the creation of a photocurrent between the electrodes.

Abstract: An optical time domain reflectometer for determining properties of an optical transmission fiber, the optical time domain reflectometer comprising an electro-absorption modulator comprising a waveguide and two electrodes, wherein the waveguide is arranged between the electrodes, a light source configured for emitting sampling light into the waveguide, wherein the waveguide is connected or to be connected between the fiber and the light source, and a control unit for controlling the operation of the light source and a modulation voltage between the electrodes. The electro-absorption modulator is capable of assuming an absorption state, wherein the electro-absorption modulator is further configured for receiving reflected light pulses resulting from the reflection of the pulses of sampling light in the fiber, wherein the absorption of reflected light pulses in the electro-absorption modulator results in the creation of a photocurrent between the electrodes.

Abstract: A machine for processing printed sheets includes a sheet delivery having a first conveying device for leading sheet ends, a second conveying device for trailing sheet ends, and a setting device for adjusting one of the two conveying devices relative to the other in a manner dependent on sheet format. The setting device includes a variable ratio gear unit for superimposing two movements.

Abstract: A machine for processing printed sheets includes a sheet delivery having a first conveying device for leading sheet ends, a second conveying device for trailing sheet ends, and a setting device for adjusting one of the two conveying devices relative to the other in a manner dependent on sheet format. The setting device includes a variable ratio gear unit for superimposing two movements.

Abstract: The inventive method serves to transmit data signals by means of virtually linked partial signals via synchronous data networks. To this end, the transmission capacity formed by the number of virtually linked partial signals is greater than the minimally required transmission capacity for transmitting the data signal.

Abstract: A device for torque compensation in a sheet-processing machine includes a cam-controlled compensating mechanism having an energy storage device for exerting a force, a cam disk, and a cam follower to be thrown onto the cam disk by action of the force from the energy storage device. At least one actuating element locks the cam follower in a rest position. A reversing drum with a torque compensation device is also provided.

Abstract: A device for preventing a spring-loaded control roller from being lifted off a control cam therefor in a gripper control system in a sheet processing machine, includes a support mechanism disposed separately from the gripper control system. The support mechanism impresses an additional force upon the control roller in critical regions.

Abstract: A device for picking up a sheet trailing edge from an upstream cylinder and transferring the sheet trailing edge to a gripper system of a downstream drum, as viewed in sheet travel direction, includes a sucker guide mechanism having a movably mounted sucker carrier whereon sucker heads subjectible to an application of vacuum or suction air are disposed. The sucker carrier is constructed as a tubular part having a longitudinal axis and being movable perpendicularly to the longitudinal axis thereof. The tubular part is formed with a vacuum or suction air duct extending in the interior thereof and is formed of carbon fiber-reinforced plastic-material laminate.

Abstract: A device for torque compensation in a sheet-processing machine includes a cam-controlled compensating mechanism having an energy storage device for exerting a force, a cam disk, and a cam follower to be thrown onto the cam disk by action of the force from the energy storage device. At least one actuating element locks the cam follower in a rest position. A reversing drum with a torque compensation device is also provided.

Abstract: An assembly including a device for holding a sheet on a cylinder participating in a reversal of the sheet, includes a region wherein the holding device is effective for holding a sheet, the effective region for the holding device being located downline, as viewed in a sheet transport direction, from an upline effective region wherein the sheet is gripped by a lifting device.

Abstract: A device for preventing a spring-loaded control roller from being lifted off a control cam therefor in a gripper control system in a sheet processing machine, includes a support mechanism disposed separately from the gripper control system. The support mechanism impresses an additional force upon the control roller in critical regions.

Abstract: A printing-machine cylinder includes a basic cylinder body and a covering element fitted to the basic cylinder body, one of the basic cylinder body and the covering element being formed with a multiplicity of recesses connectable to one of a suction-air source and a blast-air source and having, in the region of the recesses, through-channels extending from the recesses to the peripheral surface of the covering element and defining blasting/suction sections for acting upon the underside of a sheet conveyed on the peripheral surface of the cylinder; a printing machine Including the cylinder; and a method for producing the cylinder.

Abstract: A device for transferring sheets in a sheet-processing machine includes a cylinder having at least one gripper device for the sheets, and a control device for opening and closing the gripper device, the control device having a first control cam for recto printing and a second control cam for recto/verso printing, at least one follower element for following the first and second control cams, each of the first and second control cams being formed with a through opening for accommodating a bearing element and, respectively, a cutout formed in the periphery of the first and second control cams and extending as far as the through opening for fitting the first and second control cams to and removing them from the bearing element radially. The first and second control cams, respectively, are of unipartite construction and, in peripheral direction, are aligned with one another so as to provide an at least approximately closed contour path for the at least one follower element.

Abstract: A device for picking up a sheet trailing edge from an upstream cylinder and transferring the sheet trailing edge to a gripper system of a downstream drum, as viewed in sheet travel direction, includes a sucker guide mechanism having a movably mounted sucker carrier whereon sucker heads subjectible to an application of vacuum or suction air are disposed. The sucker carrier is constructed as a tubular part having a longitudinal axis and being movable perpendicularly to the longitudinal axis thereof. The tubular part-is formed with a vacuum or suction air duct extending in the interior thereof and is formed of carbon fiber-reinforced plastic-material laminate.

Abstract: A method for taking over a sheet by a trailing edge thereof from an upline cylinder of a sheet-fed rotary printing press and transferring the sheet by the trailing edge thereof to a gripper system, by placing a suction gripper on the sheet in a marginal region of the trailing edge and, during the sheet takeover, having the suction gripper follow the periphery of the upline cylinder, having the suction gripper guided at a constant tangent into the periphery of a downline inverting drum and, along this course, having the suction gripper execute a relative motion in the direction of the tangent so as to tauten the sheet, which comprises, upon reaching a transfer position at the gripper system, having the suction gripper execute a relative motion in the sheet transport direction and, when the grippers close, having the suction gripper and the gripper system disposed at rest relative to one another; and a transmission system for performing the method.

Abstract: A device for transferring sheets in a sheet-processing machine includes a cylinder having at least one gripper device for the sheets, and a control device for opening and closing the gripper device, the control device having a first control cam for recto printing and a second control cam for recto/verso printing, at least one follower element for following the first and second control cams, each of the first and second control cams being formed with a through opening for accommodating a bearing element and, respectively, a cutout formed in the periphery of the first and second control cams and extending as far as the through opening for fitting the first and second control cams to and removing them from the bearing element radially. The first and second control cams, respectively, are of unipartite construction and, in peripheral direction, are aligned with one another so as to provide an at least approximately closed contour path for the at least one follower element.

Abstract: A suction gripper for transferring a trailing edge of a sheet guided on an upstream sheet-conveying cylinder to a downstream sheet-conveying cylinder of a turning device of a sheet-fed rotary printing machine includes a holding arm. The holding arm can be extended out of the circumferential surface of the downstream sheet-conveying cylinder, to which a suction head is movably fastened. The suction head is connected to the holding arm via a spring and its movement in a direction toward a circumferential surface of the upstream sheet conveying cylinder is limited by a stop.

Abstract: A device for transferring to a downline sheet-guiding cylinder of a reversing device in a sheet-fed rotary printing machine, a trailing edge of a sheet guided on an upline sheet-guiding cylinder, includes at least one lifting device for lifting the trailing edge of the sheet from the upline sheet-guiding cylinder, and a gripper device disposed on the downline sheet-guiding cylinder, the gripper device having a gripper pad extensible out of the periphery of the downline sheet-guiding cylinder for receiving the trailing edge of the sheet from the lifting device outside the periphery, and retractable into the periphery of the downline sheet-guiding cylinder after receiving the trailing edge of the sheet, the lifting device being at least one adjustable blowing nozzle disposed in a stationary manner or on the upline sheet-guiding cylinder, for blowing air beneath the trailing edge of the sheet; and a method of transferring the trailing edge of the sheet.

Abstract: A method for eliminating rhythmic register errors in sheet-fed rotary printing machines, the sheets therein being transported by an impression cylinder of double size having two gripper arrangements, includes bringing front lays, which have been provided for orienting the sheets at a feed table, out of an end position outside a conveying plane of the sheets and into a first orientation position on the feed table, then bringing the front lays back into the end position, and thereafter bringing the front lays into a second orientation position on the feed table; and a device for performing the method.

Abstract: In a reversing device of a sheet-fed rotary printing machine, there is provided a suction gripper for taking over a trailing edge of a sheet conveyed on an upline sheet-conveying cylinder, the suction gripper being movable out of a periphery of a downline sheet-conveying cylinder, gripping the sheet to be reversed in a region of the trailing edge thereof, and being movable back in a substantially radial direction towards the downline sheet-conveying cylinder for transferring thereat the trailing edge of the sheet to a further gripper device, including a device for converting the substantially radial return movement of the suction gripper into an axial movement of the suction gripper so as to tauten the sheet.