Abstract: In the open-end spinning unit provided with a casing and a combing roller rotatably mounted in the casing, a spinning rotor producing a twisted yarn from individual fibers carried from a combing zone defined by the combing roller, a carrying space formed between the combing roller and the inside surface of the casing, a mechanism for feeding a bundle of fibers into an upstream terminal of the carrying space, a dust removing mechanism communicated with the carrying space for discharging dust particles separated from useful fibers carried to the spinning rotor, and a combing roller provided with a plurality of combing elements, helically mounted on a main cylindrical surface thereof, the inside top or bottom surface of the dust removing formed in the dust removing mechanism is projected inside to a level corresponding to a level defined by an imaginary plan of a rotational trace of either one of the terminal ends of the combing elements helically mounted on a cylindrical body of the combing roller, in the condi

Abstract: A method of and apparatus for removing dirt particles from staple fibers and straightening the resulting clean fibers in an open-end spinning unit which includes means for feeding sliver, fiber opening means, and means for twisting the thus cleaned and opened fibers. Fibers together with dirt particles contained therein are accelerated by the opening action and are exposed to a first air flow which, by its deceleration due to its expansion, separates the dirt particles from the fibers. Immediately thereafter, the thus cleaned fibers are exposed to a second air flow by which they are straightened due to an acceleration imparted to them by said second air flow.In the apparatus of the invention there are provided three sectors, viz. a fiber opening sector, a dirt discharging sector, and a fiber straightening sector, in that order, the dirt discharging sector merging with the fiber straightening sector via a widened mouth.

Abstract: Device for temporarily stopping the operation of spinning stations of a spinning machine equipped with means for automatic inspection and/or cleaning of the machine after an interruption in the spinning operation at a spinning station and for thereafter restarting the operation of the respective spinning station includes a monitoring device associated with each spinning station having means for producing an intentional interruption of the spinning operation at the respective spinning station when a given value of a characteristic of the uninterrupted spinning process is reached or exceeded and only when no other spinning station serviced by the means for automatic inspection and/or cleaning of the machine is out of operation due to an interruption of the spinning operation performed thereat that requires correction.

Abstract: A dust removing mechanism is applied to each unit of an open-end spinning machine. In each spinning unit provided with an opening roller and a spinning rotor for creating a yarn from fibers supplied from the opening roller, a casing partly surrounds the opening roller and a dust removing opening is formed in the casing. In such mechanism, a dust removing zone is formed so that it communicates with the dust removing opening and the dust removing zone is divided into a dust separating zone and a dust discharging zone. An air-takein opening is provided so as to create an auxiliary air stream, by which the separation of dust from the useful fibers can be effectively carried out.

Abstract: A method and apparatus for cleaning fibrous material which is fed in the form of a sliver by a delivery device to an opening roller carried within a housing which opens the fibrous material and feeds the opened fibers to an open-end spinning device. A dust separator opening is provided in the housing between the delivery device and the open-end spinning device. A source of suction is connected to the dust-separator opening and a gauze-like covering extends over the dust-separator opening for maintaining the fibrous material within the effective range of the opening roller as the fibrous material is carried thereover during the opening process. The dust from the fibrous material is withdrawn through the gauze-like covering and the dust-separator opening by the source of suction. The housing can also be provided with a trash separator opening having a separator edge positioned adjacent thereto for separating trash from the fibrous material simultaneously while the dust is being removed therefrom.

Abstract: Servicing apparatus, such as rotor cleaning and yarn piecing apparatus, for servicing individual spinning assemblies of an open end spinning machine is provided. Operational disturbance responsive control equipment is provided for controlling the movement of the servicing apparatus to servicing positions at respective spinning assemblies where operational disturbances are detected. Step-by-step control equipment is also provided to control the servicing apparatus for sequential preventive maintenance servicing operations at the various spinning assemblies. In order to optimize preventive maintenance and disturbance response maintenance, a switch-over switch is provided for switching between the disturbance responsive control equipment and the step-by-step control equipment.

Abstract: Apparatus is provided for removing debris and for cleaning components of spinning assemblies of an open-end spinning machine of the type having a plurality of spinning assemblies arranged side-by-side and including shedding devices for shedding debris from the fibrous material to be spun. In order to accommodate changing configurations of collecting openings and other structure of the spinning assemblies, the component cleaning elements are provided separately exchangeable and/or adjustable with respect to the debris removing structures. Various preferred embodiments are provided, including embodiments with conveyor belts for removing debris from a plurality of collecting openings at the respective spinning assemblies, with cleaning elements being carried by the conveyor belts and being disposed so as to clean guide surfaces at the respective collecting openings. Other embodiments include movable scrapers running along a channel which accepts the debris from the collecting openings.

Abstract: To assist textile mills in complying with Government regulation of noise levels, a tunable noise suppression device or muffler is connected to the exhaust of the fiber collection box of a pneumatic spun fiber collection system of a spinning machine. The device is adjustable to reduce exhaust noise to an acceptable level while maintaining the necessary degree of suction in the fiber collection system. The noise suppression device has the ability to nullify the most predominant noise generating sound wave lengths and/or predominant noise frequencies through tuning, whereby it is unnecessary to construct various sizes and configurations of the suppression device for use on different textile machines which may possess differing predominant noise frequencies.

Abstract: A method and apparatus for removing trash and the like from an elongated collection chamber provided on an open-end spinning apparatus. The trash, after separation from the fibrous material, is deposited in the collection chamber. A conveyor belt running through the collection chamber removes the large, coarse trash particles therefrom. A pneumatically intermittently operated collecting device removes the finer trash particles from the collection chamber without adversely affecting the separation operation wherein the trash is initially separated from the fibrous material. In one particular embodiment, a stripper cooperates with the conveyor belt that is used for removing the coarse trash particles for successively positioning a stream of air through the collecting chamber for removing the finer trash particles therefrom. A mechanical stripper is utilized with the stream of air for removing the fine trash particles from the walls of the chamber.

Abstract: The yarn-piecing and cleaning system comprises an auxiliary carriage which is separate and distinct from the robot carriage but travels on the same track as this latter, is connected thereto by means of at least one compressed-air duct and contains a compressed-air generating set. Thus the design function of the auxiliary carriage is to supply air directly at the necessary pressure and also serves as a spinning waste reservoir while the robot carriage performs yarn-piecing and cleaning operations as a transfer and control unit.

Abstract: An open-end spinning apparatus having a fiber conveying path between a fibrous material feed device and a spinning compartment. A trash separating device which includes an aperture and a dividing edge is provided for removing trash from the fibrous material as it is conveyed along the conveying path extending around an opening roller. A collection chamber is provided for receiving the trash from the trash separating device. Interposed between the trash separating device and collection chamber is an auxiliary chamber. A first aperture extends through a wall of the auxiliary chamber through which a stream of air flows for being introduced into the fiber conveying path. A second aperture is provided in an opposed wall of the auxiliary chamber through which a smaller stream of air is removed from the auxiliary chamber along with small particles of fly and trash.

Abstract: A method of removing impurities from staple fibres in ringless spinning and a device for performing said method. The impurities are ejected immediately after being contacted by the combing roller into a withdrawing space by the effect of the acceleration imparted thereto by said contact. Spinning units including a fibre separating mechanism and a rotary underpressure spinning chamber are employed. The inlet or the guiding walls for said impurities are directed in view of the separating roller tangentially. The withdrawing space can be connected to the central sucking device of the machine.