Abstract: A linear motor, comprises at least one stator device (14) with a plurality of permanent magnets (18, 18-1, 18-2) of different polarity and with at least one carrier rail (24), and at least one rotor device (12) with at least three electrical coils (44) and with at least one supporting means (26), which can be or which is supported on the carrier rail (24) of the stator device (14), wherein the rotor device (12) and the stator device (14) are moveable to and fro with respect to each other along a movement direction (FR) defined by the carrier rail (24) by interaction of magnetic fields of the permanent magnets (18, 18-1, 18-2) with the magnetic fields of the coils (44), through which current flows if required, wherein the stator device (14) is formed from at least one stator module (16-1, 16-2), wherein the stator module (16-1, 16-2) is configured such that a stator device (16) with two or more consecutively arranged stator modules (16-1, 16-2) can be formed, and wherein at the stator module (16-1, 16-2) at le

Abstract: A linear motor, comprises at least one stator device (14) with a plurality of permanent magnets (18, 18-1, 18-2) of different polarity and with at least one carrier rail (24), and at least one rotor device (12) with at least three electrical coils (44) and with at least one supporting means (26), which can be or which is supported on the carrier rail (24) of the stator device (14), wherein the rotor device (12) and the stator device (14) are moveable to and fro with respect to each other along a movement direction (FR) defined by the carrier rail (24) by interaction of magnetic fields of the permanent magnets (18, 18-1, 18-2) with the magnetic fields of the coils (44), through which current flows if required, wherein the stator device (14) is formed from at least one stator module (16-1, 16-2), wherein the stator module (16-1, 16-2) is configured such that a stator device (16) with two or more consecutively arranged stator modules (16-1, 16-2) can be formed, and wherein at the stator module (16-1, 16-2) at le

Abstract: When the size of the frame of a format mask is changed, an automatic frame-area measurement is performed, so that the exposure-duration control system of the copying machine be informed of the size of the format-mask frame to be employed. The machine is provided with photo-detectors which receive light through a transparent original for exposure-duration control purposes. At least one photodetector is used for the format-size measurement, the photodetector signal being transmitted through a controllable-gain amplifier to the exposure-duration control circuit. When an automatic frame-area measurement is commanded, all filters and shutter elements move out of the copying-light path and a calibration filter moves in so that the light incident on the photodetector does not greatly exceed that transmitted by a typical original.

Abstract: The exposure control of a photographic copying machine has several detectors which are exposed to surrounding light as well as to original-modulated copying light to transmit first signals which denote the color composition and/or density of originals. The influence of surrounding light upon the first signals is compensated for by discrete circuits which generate and store second signals corresponding to those portions of first signals which are attributable to the influence of surrounding light upon the respective detectors. The second signals are subtracted from first signals during exposure of an original to copying light whereby the resulting third signals denote the color composition and/or density of the original as if the detectors were not exposed to surrounding light.