Abstract: A method of regulating a drafting arrangement, in which measuring signals are acquired at a feed end of the drafting arrangement, compared with a set value to provide a differential signal, and an adjusting signal for the control unit of a variable speed motor for the pair of drafting rollers is derived from the differential signal, provides reliable control results and adjustment of the sliver where a difference has been detected. Set values are entered by a transfer address from a set-point register. The basic speed is derived from actual speed of a doffer and supplied as basic voltage to the control unit of the variable speed motor. A measuring clock pulse of low frequency is generated, dependent upon a roller of the drafting arrangement. With every measuring clock pulse a measuring signal is obtained, converted into a digital signal, compared with the activated transfer address of the set-point register and a differential signal is generated.

Abstract: A process and apparatus for detecting impurity particles in fluids, particularly in infusion solutions contained in bottles, with the apparatus including illuminating and etecting device for defining an optical path through which a fluid is conveyed along a fluid conveying path. To increase reliability of detection, pure air is blow from the optical path into a fluid conveying channel thereby ensuring freedom from dust. The conveying channel of the fluid in a vicinity of the illuminating and detecting device, in a direction of the optical path, has an opening, and a blower having a filter is located on the other side of the opening, as viewed in a direction of the conveying path.

Abstract: A method is proposed for detecting foreign bodies in fluids to investigate the fluids such as infusion liquids for foreign bodies which can lead to the plugging of infusion needles or other dangers for a patient. In the method light is directed onto the fluid and the light departing from this fluid is detected. The fluid is illuminated evenly with polarized light, and the light penetrating through the fluid is further dimmed by further polarization. The light intensity of individual measuring regions is measured through photo-electric sensing and the measured intensity is compared with an adjustable threshold so that when the threshold is exceeded at any given time during a measuring interval, corresponding signals are produced.

Abstract: A card clothing for a stationary or movable carding segments of a carding machine includes at least two rows of groups of tips. The rows are located one after another in the direction of carding and each row extends transversally of the direction of carding. Each group has from two to six tips positioned one after another. The groups of the tips in the first row are laterally spaced from each other a distance equal to at least three widths of each group. The groups of tips arranged in the following row are laterally offset relative to the groups of the previous row, as seen in the direction of carding, a distance equal to at least the width of one group.