Abstract: A tamping unit for tamping sleepers of a track includes a lowerable tool carrier and oppositely positioned tamping tools. Each tamping tool is connected via a pivot arm to a squeezing drive for producing a squeezing motion and to an electric vibration drive for producing a vibratory motion. The electric vibration drive includes an eccentric shaft which, together with a rotor of an electric motor, is mounted merely in an eccenter housing. A stator of the electric motor with a motor housing is flange-mounted to the eccenter housing. As a result of the omission of a separate motor mounting, the motor housing has a particularly small overall depth.

Abstract: A track maintenance machine for compaction of ballast under sleepers of a track includes a machine frame movable by undercarriages on the track and a tamping unit which includes an electric vibration drive for vibratory actuation of tamping tools. An electric intermediate circuit has an electric energy store or storage device. An electric machine is associated with at least one undercarriage and coupled for generator operation to the intermediate circuit. The electric vibration drive is coupled to the intermediate circuit for supply. In this way, braking energy is used in an optimal manner for supplying the vibration drive. A method for operation of a track maintenance machine is also provided.

Abstract: A track maintenance wagon (1) for picking up and/or laying a track panel (10), comprising a wagon frame (2) supported on on-track undercarriages (4), wherein two longitudinal beams (7) of the wagon frame (2) delimit a free opening and are transversely displaceable relative to one another, so that the free opening is changeable as to its width and, in a working position, has greater opening dimensions as a horizontal projection of the track panel (19), and wherein crane rails (8) are arranged on the longitudinal beams (7) for a gantry crane (11) mobile in the longitudinal direction (3) of the wagon. In this, buffers (13) are arranged at two free ends (12) of the longitudinal beams (7).

Abstract: A tamping unit for tamping sleepers of a track includes a lowerable tool carrier and oppositely positioned tamping tools. Each tamping tool is connected via a pivot arm to a squeezing drive for producing a squeezing motion and to an electric vibration drive for producing a vibratory motion. The electric vibration drive includes an eccentric shaft which, together with a rotor of an electric motor, is mounted merely in an eccenter housing. A stator of the electric motor with a motor housing is flange-mounted to the eccenter housing. As a result of the omission of a separate motor mounting, the motor housing has a particularly small overall depth.

Abstract: A track maintenance machine, constructed to be mobile on a track, for consolidation of a ballast bed underneath a track, includes a machine frame supported on an undercarriage and a consolidating device, connected to the machine frame, which includes at least one consolidating element constructed to be lowered. The consolidating element is constructed as a consolidating plate which, in a working position, is larger in a longitudinal direction of the track than a distance between two sleepers of the track, and the consolidating plate is disposed to be rotatable in order to turn the consolidating plate into a passing position for lowering or raising between two sleepers. A method for consolidation of the ballast bed underneath a track by using a track maintenance machine is also provided.

Abstract: A track maintenance machine for compaction of ballast under sleepers of a track includes a machine frame movable by undercarriages on the track and a tamping unit which includes an electric vibration drive for vibratory actuation of tamping tools. An electric intermediate circuit has an electric energy store or storage device. An electric machine is associated with at least one undercarriage and coupled for generator operation to the intermediate circuit. The electric vibration drive is coupled to the intermediate circuit for supply. In this way, braking energy is used in an optimal manner for supplying the vibration drive. A method for operation of a track maintenance machine is also provided.

Abstract: A track maintenance wagon (1) for picking up and/or laying a track panel (10), comprising a wagon frame (2) supported on on-track undercarriages (4), wherein two longitudinal beams (7) of the wagon frame (2) delimit a free opening and are transversely displaceable relative to one another, so that the free opening is changeable as to its width and, in a working position, has greater opening dimensions as a horizontal projection of the track panel (19), and wherein crane rails (8) are arranged on the longitudinal beams (7) for a gantry crane (11) mobile in the longitudinal direction (3) of the wagon. In this, buffers (13) are arranged at two free ends (12) of the longitudinal beams (7).

Abstract: A track maintenance machine, constructed to be mobile on a track, for consolidation of a ballast bed underneath a track, includes a machine frame supported on an undercarriage and a consolidating device, connected to the machine frame, which includes at least one consolidating element constructed to be lowered. The consolidating element is constructed as a consolidating plate which, in a working position, is larger in a longitudinal direction of the track than a distance between two sleepers of the track, and the consolidating plate is disposed to be rotatable in order to turn the consolidating plate into a passing position for lowering or raising between two sleepers. A method for consolidation of the ballast bed underneath a track by using a track maintenance machine is also provided.

Abstract: A positioning device for a printing press, having at least one guard adjustable within an adjustment range relative to an instantaneous pole axis in a first adjusting direction counter to gravity and in an opposed second adjusting direction, and having an energy storage for setting a variable support moment in opposition to a moment of weight resulting from the gravity and engaging with the guard, includes a control cam having a predetermined contour, a cam follower contacting the control cam for controlling the support moment by motion of the cam follower relative to the control cam, the contour of the control cam being such that the guard is in equilibrium at every location within the adjustment range under the influence of the support moment and a manual force of predetermined magnitude and direction which is associated with the respective location, the manual force, upon being adjusted in the first adjusting direction, counteracting the moment of weight in an initial section of the adjustment range.

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: Device for avoiding registration errors at an oscillating pregripper of a sheet-processing machine includes a gripper bar deflectable in synchronism with the machine so that a respective sheet being processed therein undergoes stretching in a trailing region of the sheet. The gripper bar, in a middle region thereof, is guided and driven in a flexurally bending-resistant manner. A feeder cylinder carries thrust pads at both sides thereof for deflecting the gripper bar at the ends thereof in a sheet travel direction before a respective transfer of a sheet at the feeder cylinder, and for maintaining the deflection until sheet transfer has been completed.

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: An adjusting device has a pneumatically operating piston-cylinder unit pressurizable in an operating function thereof for actuating adjusting elements in a printing press. The piston-cylinder unit includes a cylinder housing formed with a cylinder chamber, a piston displaceable in the cylinder chamber, and an electromagnet for applying an activated holding force to the piston, the piston being subjectible pneumatically to a prepressurizing force in the cylinder chamber opposite to and less than the activated holding force.

Abstract: A device for securing a flexible printing plate under tension on a plate cylinder is used in combination with the plate cylinder which has an axially extending channel with side walls formed therein. There is a tensioning rail operatively associated with each end of the printing plate. Each tensioning rail is braceable against one of the side walls of the axially extending channel formed in the plate cylinder for tensioning the printing plate. The device includes one of the tensioning rails operatively associated with at least one of the ends of the printing plate which is one-piece and has a central clamping member disposed at a middle region thereof for clamping a center of the one plate end. Respective tensioning strips are disposed at end regions of the tensioning rail. Each tensioning strip is mounted for axial movement on the tensioning rail and has an edge clamping member mounted thereon for clamping an edge of the one plate end.

Abstract: Bending device for offset printing plates having a support plate formed with a head portion, a respective bending bar pivotally mounted at opposite ends of the head portion for bending respective ends of a printing plate disposed on the head portion, a lowerable down-holder member for holding a printing plate down against the head portion, and a positioning device for bending the printing-plate ends in-register to given printing-plate dimensions, includes adjusting means disposed parallel to the support plate between the opposite ends of the support-plate head portion, the adjusting means being movable into a plane wherein a printing plate is disposed on the head portion, so as to deflect at least part of the printing plate out of the plane.