Heidelberger Druckmaschinen Ag

Michael Merz

Oliver Koch

Bernhard Buck

Karl-Heinz Helmst&auml;dter

Markus M&ouml;hringer

For invention enables torque-compensation of alternating interference-torques in a printing machine. The printing machine, in particular a sheet-fed printing press, has one or more processing stations with cylinders and drums and at least one gear train. The gear train is formed with multiple gear-wheels that drive the cylinders and drums. In a first configuration there is provided an elastic coupling between two equidirectionally rotating gear-wheels. In a second configuration there is provided an elastic crank on a gear-wheel. There is thus impressed onto gear wheel or gear wheels, an additional and variable torque, in addition to the driving-torque of the printing machine.

Printing machine with torque compensation

A method for absorbing torsional vibrations of a printing machine, wherein at least one torsional vibration-absorbing element acts upon a gearwheel train of the printing machine, includes determining a first characteristic form and characteristic frequency of a printing machine, and assigning to at least one shaft journal of a gearwheel whereon highest amplitudes of the first characteristic frequency occur, a passive torsional vibration absorber modulated to reductions of the first characteristic frequency; and a device for performing the method.

Method and device for absorbing torsional vibrations of a printing machine

A method for compensating torsional vibrations of a printing machine by introducing torques which compensate vibration excitation, includes determining at least one characteristic form of a printing machine for at least one location on a drive train of the printing machine, determining and storing at least one respective countertorque for compensating the torques which excite vibration in a characteristic form at a location whereat the characteristic form is not zero, and applying the at least one countertorque at the corresponding location so that the vibration is maximally reduced due to the application of the at least one countertorque.

Method and apparatus for compensating torsional vibrations of a printing machine by introducing torques which compensate the vibration excitation

A method of controlling negative-pressure level of a lateral pulling device for laterally aligning sheets through the intermediary of a rotary valve, includes having, during an accelerating phase of the lateral pulling device, a high-level negative pressure at a suction pull bar of the lateral pulling device; upon reaching a maximum and constant speed of the suction pull bar, a medium-level negative pressure at the suction pull bar; and, after reaching a desired pulling path of the suction pull bar, up to an end position of the suction pull bar, a low-level negative pressure and no negative pressure, respectively, at the suction pull bar; and a device for performing the method.

Growing community of inventors

Sandhausen, Germany

Michael Merz