U.S. Philips Corporation

Psi Printer Systems International Gmbh

Klaus Brandenburg

Wendelin Weber

Hermann Richter

Klaus-Peter Kluge

Kurt-Hermann Richter

A method of operating a printer in which, after positioning of a paper web for printing and the printing of the web, the last printed sheet is removed and the leading edge of the web is retracted in a park position. The retraction of the leading edge of the web from this proper printing position until it passes a sensor is detected and this difference in displacement of the drive is stored for correction of advance of the same web from the parking position subsequently.

Method of operating a printer

A printer has a drum with at least one slot for receiving sheet-like record carriers. The slot extends into the circumference of the drum and is dimensioned to receive clamping means for holding the record carrier with a clamping fit. The control of the clamping means is effected, for example, by means of disks which are secured adjacent the end faces of the drum and whose circumference is also engaged by the clamping means. The disks are provided at their outer side with a first stopper element, which resiliently co-operates with a second stopper element secured to the housing of the device in such a manner that upon rotation of the drum in the printing direction of rotation one stopper element slips over the other and upon rotation of the drum in opposite direction prevent the rotation of the disk. Thus, the clamping means are passed out of the slot. Upon rotation of the drum in the printing direction of rotation, the disks, which are connected to the drum through a tensile spring, are moved in a direction opposite to the printing direction of rotation so that the clamping means are again pressed into the slot.

Printer having automatic paper positioning means

An electromagnetic drive for a recording pin of a matrix printer, comprising a cylindrical armature which is displaceable by means of an excitation coil and in which a clamping sleeve is provided which comprises an indentation which encloses the recording pin in a clamping manner and whose length governs the position of the recording pin.

Electromagnetic drive for recording pins in a matrix printer

In a magnetically operated matrix printer a circuit makes a decision when a magnet is actuated. The decision is whether or not the relevant magnet has already been actuated during the printing of the previous column of the matrix character being printed. When it has not been actuated, it is actuated with a larger quantity of energy (longer pulse). Thus the operation of the printer is in 'resonance' with the mechanical movements of the magnet armature.

Stylus printer impact energy control

In a serial electrostatic printer, the developing device has a magnetic brush feeding toner to the record carrier, divided into a large number of magnetic regions. The magnetic region trailing the printing location is activated after printing.

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Freudenberg, Germany

Klaus Brandenburg