Abstract: A cleaning unit (10) for an ink jet printer has a suction and parking cap (16) with an orifice (18), which can be placed on a print head in order to totally prevent any light from getting in.

Abstract: The invention relates to an ink jet printer (10) for different media with a print head unit (14) having at least one print head (16) for applying print to the medium (101) and a printing table (110) for positioning and/or guiding the medium (101) to be printed, and a displacement mechanism for varying a distance between the print head unit (14) and the medium (101) in a direction perpendicular to the guide surface as well as a control system (120).

Abstract: A gripping apparatus for reel material includes a reel support, a first clamping device and a second clamping device as well as a cutting device arranged between the clamping devices. The first clamping device is spring-mounted along two non-parallel axes so that the paper web can be evenly clamped and cut transversely to the web direction without twisting and formation of undulations.

Abstract: A take-up apparatus for reel material of an image exposing device has a driven winding drum and a sensor provided to control the drive of the winding drum. The sensor detects the position of the reel material ahead of the winding drum. In this case, the drive of the winding drum is controlled in such a manner that the reel material forms a bulge (A) ahead of the winding drum with a substantially constant curvature.

Abstract: A diaphragm adjusting arrangement in an enlarging appartus having several lenses with an adjustable diaphragm includes a motor drive for the common adjustment of the diaphragms of all lenses and a device for detecting the adjusting path. By means of the comparison of the actual position of the diaphragms with a given desired position in a control circuit, a control signal is generated for the motor drive to move the diaphragms into the given position.

Abstract: A light measuring apparatus for measuring the light transmitted through filters to a light sensor is equipped with a filter wheel having non light transmissive segments alternating with the light transmissive filters, which filter wheel is manually rotatable by a lever. By repositioning the lever through a certain angle, its motion is translated via a spring and various gears and additional transmission elements to rotate the filter wheel and periodically shield the light sensor. The shielding of the light sensor for short periods permits a determination of an error signal in the light measuring apparatus. To obtain a shielding time period above a required minimum independent of the speed with which the lever is moved, the motion of the filter wheel is automatically delayed by mechanical means.

Abstract: A color filter-determining apparatus, which indicates the color component to be balanced, has two measuring circuits, each of which contains a pair of photoelectric transducers. One of the photoelectric transducers in each measuring circuit is sensitive to the same primary color and the other transducers are sensitive to different primary colors. The measuring circuits comprise resistance measuring bridges, which are complemented by resistors and diagonally supplied by separate power sources and also diagonally connected to inputs of operational amplifiers, such as sum-and-difference amplifiers.