Mannesmann Aktiengesellschaft

Deutsche Thomson-Brandt Gmbh

Wilfried Rohde

Arthur Kurz

Engelbert Laufer

Jurgen Krause

Rupert Baur

Lothar Bauer

In a multifunction printer with a journal device (13) for recording of data processed in the printer for purposes of data securing or, respectively, documentation, at least one print unit (6) is provided for the printing of the input data. In addition, in most cases, further printer modules (9), coordinated to a respective printer function, are furnished. In order to solve the space requirements of a space-volume-requiring journal device (13), and in order to achieve the smallest possible dimensions of the overall printer, a journal device (13) is coordinated to a form print unit (15) or to an additional sales-receipt print unit (11), which journal device (13) comprises a secondary controller (16), selectable from the pull-in controller (3) of the main platen (2), with an interface (17) and with a data storage memory (18), where the input data are permanently filed in the data storage memory (18) and are recallable and are printable with the aid of a form print unit (15) or of the sales-receipt print unit ( 11).

Multifunction printer with a journal device

In a control loop for automatically adjusting variable-gain amplification, a sinusoidal signal with a frequency f.sub.o that is critical for the control loop is superimposed over a positioning parameter W. Two synchronous rectifiers S1 and S2 filter out the oscillation components of a control parameter x and of a control difference x.sub.d that contain frequency f.sub.o, and the components are compared in a comparator VL. A control and regulating circuit C continues to vary the variable-gain amplification at controls RG until the amplitudes of the oscillation components being compared in the comparator are equal. The variable-gain amplification is correct at that point. The variable-gain amplification can even be adjusted in a compact-disk player while the player is in operation.

Method of and circuitry for automatically adjusting the variable-gain

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Unterkirnach, Germany

Wilfried Rohde