Abstract: Polysuccinimide, polyaspartic acid and their salts are prepared by reaction of maleic anhydride and ammonia, polycondensation of the resulting product in the presence of a solubilizing agent and, if appropriate, hydrolysis.

Abstract: Polysuccinimide is prepared by reaction of fumaric acid, maleic acid or a derivative thereof with urea, isourea, carbamic acid, ammonium carbamide, ammonium bicarbonate, diammonium carbonate or mixtures of the abovementioned substances in a reactor at temperatures of preferably 100.degree. C. to 300.degree. C. over reaction times of preferably 0.5 minute to 300 minutes.

Abstract: The lubricator is disposed at the picking end of the picking element return device and has a guide duct for receiving a picking element prior to the next pick. The lubricator has oil mist nozzles which face only those surfaces of the picking element which will rub on the guide teeth in the next pick.Very low-quantity lubrication or lean lubrication is feasiable and soiling of the fabric by lubricant is obviated. The lubrication effect is sufficient to obviate metal abrasion between the picking element and the guide teeth so that soiling of the fabric by abraded metal can be avoided.

Abstract: The projectile weaving machine is provided with a retractor apparatus at the braking device in which an elastically yielding and damping body is disposed to absorb impact forces and damp vibrations. The elastically yielding and damping body is located between the stop surface of the retractor and a fulcrum between the retractor and a lever for moving the retractor within the apparatus. In some embodiments, the body is positioned between two parts of the retractor while in other embodiments, the body may be disposed between the retractor and the moving means or may be incorporated in the retractor itself.

Abstract: The brake uses a slow brake feature whereby a positioning member, such as a lever, is actuated directly via a first spring to cause braking in response to faults only on the weaving side as well as a fast or normal brake feature whereby the positioning member is able to transmit the braking force of a second spring to effect braking in response to faults on the weaving side or mechanical side. The second spring acts on the positioning member via an abutment which is moved against the positioning member upon release of the second spring. The second spring can be released via an electromagnet in response to a weaving fault on the weaving side or by a stop-motion rod in response to a mechanical fault.

Abstract: The braking system for the textile machine is provided with a multiplicity of brake elements which are individually controlled via a common control means. Each brake has a different braking characteristic from the other so that the machine components or attachments can be separately braked. The braking system can be electronically controlled so as to not only brake but also to permit adjustment of the brakes.