Abstract: The invention concerns a method and a circuit arrangement for electrically driving print electrodes in an electroerosion printer by means of driver stages producing relatively strong and relatively short ignition pulses as well as by means of driver stages producing relatively weak burning pulses which are of longer duration than the ignition pulses. The burning pulse is first initiated and if an arc is struck, the ignition pulse is not required. Use of the burning pulse alone produces a sharp edge printing mark. Only if the burning pulse is unable to strike an arc is the ignition pulse delivered to assure that printing occurs.

Abstract: Logic analyzer adapter includes a time measuring adapter. Only a subset of the input channels of the signal analyzer are used to store input data when an event occurs, i.e., when one or more of the binary input signals change their value. A time counter is provided for measuring the time that has elapsed between two consecutive events. The contents of the time counter are transferred to the logic analyzer on the remaining input channels. In another mode of operation, the signal on a predetermined input channel is used to control the storing operation. The time counter is reset after each storing operation. In still another mode of operation, the signal on a predetermined channel can be used to inhibit or to allow the storing of the signals on the remaining input channels.

Abstract: A yieldably supported ramp controls the lowering of a print head onto a record carrier. An elastically deformable element having non-linear deformation characteristics is preferred to define the desired force displacement characteristics.

Abstract: The invention concerns a method of recording information on an electrosensitive record carrier, preferably a record carrier covered with a metallic or metalliferous layer, by means of a print head movable relatively parallel to the surface of the record carrier and comprising at least one print electrode controllable by print pulses, and a control circuit for the timely generation of the print pulses from digital or analog signals received in such a manner that the duration and amplitude of each print current pulse are chosen so that the print process triggered by the individual print pulse is completed by the time the print pulse stops.

Abstract: For record carriers with a greatly varying thickness of the metal layer, the burn out process is effected dynamically with respect to the current strength. During the starting phase up to the beginning of the actual arcing phase a relatively high current is applied which is sufficient to burn out even thick metal layers. As burning out proceeds, the print current, after a particular arc voltage has been reached, is reduced in a short time, maintaining the arc and avoiding an undesirable burning out which would increase the print spot. For thinner metal layers the burn out current is correspondingly lower. The maximum burn out current is automatically adjusted to the thickness of the metal layer by measuring the arc voltage between electrode and metal surface of the record carrier. Suitable arrangements for controlling the burn out current are characterized by an (arc) voltage-controlled current control circuit.