Abstract: A method is provided for isolating a compound in a sample by chromatography. The method includes determining an analytical gradient of an analytical system; performing an analytical run using the analytical gradient; identifying a target compound in the sample and determining an analytical retention time of the target compound using chromatographic results of the analytical run; determining an elution point of the target compound using the analytical retention time, the analytical gradient and characteristics of the analytical system; determining automatically a focusing gradient of a preparative system, including a slope segment; and performing a preparative run using the focusing gradient to separate the target compound from the sample. The slope segment includes a slope determining a concentration of solvent in a solvent mixture, which linearly increases from a first offset below the elution point of the target compound to a second offset above the elution point of the target compound.

Abstract: A method is provided for isolating a compound in a sample by chromatography. The method includes determining an analytical gradient of an analytical system; performing an analytical run using the analytical gradient; identifying a target compound in the sample and determining an analytical retention time of the target compound using chromatographic results of the analytical run; determining an elution point of the target compound using the analytical retention time, the analytical gradient and characteristics of the analytical system; determining automatically a focusing gradient of a preparative system, including a slope segment; and performing a preparative run using the focusing gradient to separate the target compound from the sample. The slope segment includes a slope determining a concentration of solvent in a solvent mixture, which linearly increases from a first offset below the elution point of the target compound to a second offset above the elution point of the target compound.

Abstract: A thread brake arrangement for use in a textile processing machine includes two brake elements with the thread running there between. An actuator, preferably a piezoelectric actuator, variably actuates one of the brake elements relative to the other to exert an adjustable braking force onto the thread. The thread exerts a reaction force in the thread running direction onto the brake elements. At least one of the brake elements is movably supported to be movable along the thread running direction, and is mechanically coupled to a force transducer that measures the reaction force, which is proportional or equal to the thread tension force. A regulating arrangement receives the measured force signal, and controls the actuator to adjust the adjustable brake element, so as to vary the applied braking force and thus regulate the arising thread tension responsive to and dependent on the measured reaction force.

Abstract: In a gripper weaving loom which weaves several different types of weft threads into a fabric, it is desirable to keep weft material waste to a minimum. For this purpose a weft thread (7) already inserted into the loom shed is simultaneously held by a weft presenting clamp (13) and by a holding clamp (18). As soon as the weft is held by both clamps the weft is cut by a cutter (20) effective between the two clamps to form a trailing weft end (7B) of the already inserted weft and a leading weft end (7A) of a weft yet to be inserted. The holding clamp (18) keeps holding the trailing end (7B) until beat-up of the weft by the reed (4) is completed. For this purpose, the holding clamp (18) moves with the reed (4) into the beat-up position. When beat-up is completed the holding clamp (18) releases the trailing weft end (7B) and returns into a weft receiving position (22B). The weft presenting clamp (13) still holds the leading end (12A).

Abstract: A thread brake arrangement for use in a textile processing machine includes two brake elements with the thread running therebetween. An actuator, preferably a piezoelectric actuator, variably actuates one of the brake elements relative to the other to exert an adjustable braking force onto the thread. The thread exerts a reaction force in the thread running direction onto the brake elements. At least one of the brake elements is movably supported to be movable along the thread running direction, and is mechanically coupled to a force transducer that measures the reaction force, which is proportional or equal to the thread tension force. A regulating arrangement receives the measured force signal, and controls the actuator to adjust the adjustable brake element, so as to vary the applied braking force and thus regulate the arising thread tension responsive to and dependent on the measured reaction force.

Abstract: In a gripper weaving loom which weaves several different types of weft threads into a fabric, it is desirable to keep weft material waste to a minimum. For this purpose a weft thread (7) already inserted into the loom shed is simultaneously held by a weft presenting clamp (13) and by a holding clamp (18). As soon as the weft is held by both clamps the weft is cut by a cutter (20) effective between the two clamps to form a trailing weft end (7B) of the already inserted weft and a leading weft end (7A) of a weft yet to be inserted. The holding clamp (18) keeps holding the trailing end (7B) until beat-up of the weft by the reed (4) is completed. For this purpose, the holding clamp (18) moves with the reed (4) into the beat-up position. When beat-up is completed the holding clamp (18) releases the trailing weft end (7B) and returns into a weft receiving position (22B). The weft presenting clamp (13) still holds the leading end (12A).