Abstract: Ink duct for offset or letterpress printing machines has an ink metering device by which a respective ink gap is adjustable zonewise in the axial direction of an ink duct roller. The ink metering device has metering elements pressable against the ink duct roller through the intermediary of a foil covering the metering elements, the foil being fastened so as to be movable tangentially to the ink duct roller. A device is provided for holding the foil, and an adjusting device is coupled with a motorized drive an engageable with the foil holding device for progressively moving the foil tangentially to the ink duct roller at a substantially uniform feed rate so as to dispose succeeding locations of the foil at a given distance from the ink duct roller corresponding to the width of the respective ink gap.

Abstract: A method of determining an operating status of an adjusting drive of a printing machine having an electric motor drivable with varying direction of rotation, and a gear transmission arrangement includes determining a value of at least one of a torque produced by the electric motor and a variable dependent upon the torque, comparing the value with a corresponding value existing during an adjustment of the adjusting drive in a constant direction, and applying the value for a torque deviating by a given threshold value from the torque occurring during the adjustment of the adjusting drive in the constant direction as a criterion for an operating status deviating from the adjustment on the constant direction.

Abstract: A measuring and/or color matching table having a sheet support surface, including a device for assessing printing quality of a printed sheet deposited on the sheet support surface, and a lighting fixture disposed above and spaced from the sheet support surface, the table having a front side from which the device is operable by an operator, a front part of the sheet supported surface facing towards the operator at the front side of the table and being inclined upwardly at an obtuse angle to a rear part of the sheet support surface.

Abstract: A filter device on electrical switch cabinets, housings for electronic systems and like equipment to be maintained free of dust and impurities while being ventilated during operation includes a labyrinth filter disposed in a travel path of ventilating air upstream of an air intake opening of the equipment to be ventilated, the labyrinth filter having means for effecting a plurality of changes in direction of flow of the ventilating air therethrough so as to function in a manner similar to that of a mechanical labyrinth seal.

Abstract: A data transmission system having a plurality of devices mutually connected by electric lines affording data transmission therebetween in both directions, the devices having at least one data output and a data input separated from the data output, including an optocoupler and an electrical receiving unit contained in at least one of the devices, the optocoupler having an input connected to the data input of the one device, and having an output connected to the electrical receiving unit of the one device.

Abstract: In a rotary printing machine, a register adjustment device for adjusting circumferential register and lateral register of a plate cylinder mounted for displacement in axial direction thereof and being connected to a device for displacing the plate cylinder in axial direction includes a double gear having first and second toothings thereon, one of the toothings having obliquely extending teeth and the other of the toothings having teeth extending in a direction differing from the direction in which the teeth of the one toothing extend, both the first and the second toothings being immovable relative to one another, the double gear being also mounted for displacement in axial direction thereof and being connected to a device for displacing the double gear; a drive gear meshing with the first toothing; and a further gear meshing with the second toothing, the further gear being connected with the plate cylinder and fixed thereto against relative rotation therewith and against relative displacement in axial direct

Abstract: A printing press, in particular an offset printing press comprising a plurality of individually operable setting motors, in particular for adjusting the inkfilm density profile, each setting motor being connected to a pick-up generating electric signals characteristic of the actual position of the setting motor at any given moment (actual values) comprises an electronic comparator arrangement (35, 44) which is supplied with the actual values and, in addition, desired values for the position of the individual setting motors (9) and which repeatedly scans the actual values sequentially in a cyclical time sequence and compares each actual value with the related desired value to form a setting signal for operation of the associated setting motor in the forward or reverse direction when a given positive or negative minimum deviation is exceeded.

Abstract: Checking device for protecting against faults arising from a paper wind-up in a rotary printing machine having a printing unit with a blanket cylinder and a printing-unit protecting grid, the checking device including at least one control device disposed in stationary relationship with respect to and adjacent the blanket cylinder and upstream in travel direction of paper through the printing machine, of a location at which the paper wind-up is produced and including a photoelectric sensor formed as a contrast measurement detector for scanning the blanket of the blanket cylinder and generating a signal when a print product is present, the sensor being mounted on the protecting grid at a lower region thereof and being foldable away together with the protecting grid.

Abstract: Electrical safety device for controlling a printing machine having a control transformer with a plurality of primary and secondary taps for varying voltage levels including respective control lines connected to the secondary taps, a voltage monitoring device connected in a respective control line of one of the secondary taps, and a voltage changing switching device operatively associated with one of the primary taps, the voltage monitoring device being coupled with the voltage changing switching device.

Abstract: Device for controlling a plurality of servomotors on a printing machine having a plurality of printing units with the servomotors respectively assigned to individual zones of the printing units, a control unit connected to the servomotors for switching the servomotors on and off, and a power supply for supplying operating current to the servomotors, including a current-measuring module located in a connection between the power supply and the control unit for measuring a control current corresponding to the operating current supplied to the servomotors, the current-measuring module being controllable by a microprocessor for limiting the number of operating servomotors.