Abstract: The invention relates to a process to determine the diameter of a bobbin at a spinning station of a spinning machine processing fiber slivers as well as to a device to carry out this process. The object is to avoid listed disadvantages and to find the applicable diameter of a bobbin in a simple manner and without directly touching said bobbin.

Abstract: To piece an open-end spinning device, the yarn end is introduced into the spinning rotor while the spinning rotor is stopped. An auxiliary suction air stream prevailing at the opener roller housing takes effect and sucks the yarn into the fiber feeding channel where it is held. The spinning rotor which was stopped until then is then again driven. Following this, the negative spinning pressure is switched on while the auxiliary suction air stream is simultaneously switched off. This causes the yarn end to be taken out of the fiber feeding channel and to be fed to the fiber collection surface of the spinning rotor where it is combined with the fibers which are again conveyed to the fiber collection surface. The yarn is then withdrawn in the form of a continuous yarn through the yarn draw-off pipe and out of the spinning rotor.

Abstract: The invention relates to an autolevelling draw-frame of the textile industry in which the drafting of the fiber sliver can be modified in a controlled and/or autolevelled manner. It is the object of the invention to analyze electrical signals or measured values of a draw-frame so that correction may be made on basis of these analyses. This object is attained in that additional, time-related signal analyses are conducted independently of autolevelling. They make it possible to recognize corrigible deviations within the analyzed signals as well as the establishment of appropriate correction values. If deviations exceed a tolerance, a determination is made in combination with the knowledge memory of a computer whether the deviation is due to a disturbance in the machine or whether the deviation can be explained as a logical consequence.

Abstract: The instant invention relates to a process and device for piecing on an open-end spinning device. Before the beginning of the piecing process the desired run-up curve for the fiber stream which is to be fed to the fiber collection surface and the acceleration curve of the fiber feeding device corresponding to this run-up curve are defined. During piecing the fiber feeding device is switched on and is driven in accordance with the defined acceleration curve. The fiber stream produced thereby is deflected and removed on its way between the fiber feeding device and a fiber collection surface. In this process the current actual values are calculated from the acceleration curve of the fiber feeding device and the fiber stream is again fed to the fiber collection surface when a predetermined desired value has been reached, before the fiber stream which is started by switching on the fiber feeding device has reached its full strength.

Abstract: Process and device are provided for the automatic adjustment of the rotational speed ratios among the operating elements of a draw frame.The invention utilizes a drive for a draw frame which is less expensive and at the same time achieves a higher degree of automation and precision for the adjustment of the rotational speed ratios between the operating elements. The total required power to be supplied to the operating elements of a draw frame is divided up between a main motor and several separate motors. The distribution of the required power capacity is such that the main motor delivers a constant required power which represents the major part of the total required power. All the separate motors which deliver selectively variable required power, together furnish the lesser share of the total required power. According to the device, the mechanical gear coupling of all operating elements among each other is at the same time coupled to individual drives for all operating elements.

Abstract: A flat can for receiving textile fiber slivers deposited therein while a jigging motion is imparted thereto comprises can sides defining an upper can bead at the top thereof. A can plate is configured to be vertically movable within the can sides between an empty position and a full position. In the empty position the can plate is at a height lower than the upper can bead. The can plate may comprise a rim around the circumference thereof which has a top generally adjacent to the upper can bead when the can plate is at the empty position. The rim may include oppositely facing incline surfaces at the ends thereof. The can sides may also include stops defined on the inner surface thereof. The stops serve to define the upper limit of travel of the can plate within the can.

Abstract: An open-end spinning machine having a spinning rotor attached to a shaft is provided wherein the shaft of the spinning rotor is driven by a driving device. The shaft of the spinning rotor is held in the nips of pairs of rearward and forward supporting disks. During spinning operations, an axial force is generated in the axial direction of the free end of the rotor shaft. The open-end spinning device further comprises a radial support surrounding at least a portion of the circumference of the rotor shaft and disposed at least in part in the area between the free end of the shaft and the area of the shaft acted upon by the rearward pair of disks.

Abstract: A process and device are utilized for severing a fiber sliver on a draw frame. A fiber sliver is conveyed through a calender roller pair of the draw frame to a sliver guiding channel of a rotary plate. The sliver is deposited through the rotary plate into a storage can. A mechanical severing device is operably disposed to sever the fiber sliver in an area between the calender roller pair and the outlet of the sliver guiding channel.

Abstract: The invention relates to a yarn guidance rod 1 and to a device for the laying of a yarn on a cross-wound bobbin in a textile machine 8.A plurality of winding stations installed next to each other is serviced by a yarn guidance rod made of a carbon fiber reinforced plastic which can be moved back and forth. The yarn guidance rod 1 is provided with a sheathing 3. The yarn guidance rod 1 has segments made of a highly heat-expandable material in order to achieve heat compensation.

Abstract: A winding device, in particular for conical bobbins, including; a rotatable friction roller which rotates a bobbin through friction. The friction roller consists of several rotatable elements installed next to each other which are mounted on a shaft. One of the elements is connected non-rotatably with the shaft, the other elements of the friction roller are freely rotatable on the shaft and are connected to each other by a differential gear transmission. The differential gear transmission is in the form of a friction wheel transmission. The axes of the friction wheel transmission are at a perpendicular to the shaft.

Abstract: An open-end spinning machine with a machine frame with at least one section. The latter is provided for each longitudinal machine side with a rigid structural unit which consists of several longitudinal structural elements and two end walls. Intermediate walls are provided at least between two adjoining pairs of spinning stations. These intermediate walls are rigidly connected to the longitudinal structural elements as are the intermediate walls, whereby the groups of technological spinning elements, including the parts of drive units and the winding mechanisms are attached to longitudinal structural elements and/or to the intermediate walls. The end walls of the two structural units are connected to each other in pairs.

Abstract: A bearing setup is provided for the supporting disks of an open-end spinning machine, the supporting disks being supportively fixed on the ends of a shaft extending through a bearing sleeve of a supporting disk bearing. The bearing setup includes a fastening system configured with the bearing sleeve so that the supporting disk bearing can be readily and easily removed from the pillow block of the spinning machine without disassembly of the pillow block from the machine frame. The fastening system may include a threaded bore defined in the axial sleeve for engagement with a threaded screw member extending through the pillow block.

Abstract: The opener roller housing of an open and spinning device is provided with a stop for a rotor cover and for axial adjustment of the rotor shaft support. The stop is located on the side of the fiber feeding channel section of the opener roller housing which is closest to the open-end spinning rotor and is preferably an integral part of the opener roller housing. The stop is furthermore connected to a guide for the rotor cover.

Abstract: A process for piecing a broken yarn on an open-end spinning device in which the fiber feed to the fiber collection surface, and which has been interrupted during stoppage of the open-end spinning device. The fiber feed is switched back on and is immediately brought to full production speed. In this process the combed-out state of the fiber tuft at the point in time of when fiber feed is switched back on is ascertained. The point in time when yarn draw off is switched back on and the speed of it are adapted to when the feeding of fibers to the fiber collection surface becoming effective. The yarn is subjected to a multi-phase acceleration. The first phase of the draw-off acceleration is adapted to the incorporation of fibers into the back-fed yarn end. At least one additional phase of the draw-off acceleration serves to reach and/or to maintain the desired fiber mass.

Abstract: The invention relates to a process and to a device for the cleaning of a textile machine belt by means of a suction pipe. The belt is taken through the suction pipe and is subjected to suction. The suction pipe is provided with two slits for that purpose, by means of which the suction pipe surrounds the belt.

Abstract: The invention relates to a device for heat removal from the interior space of a control cabinet of a textile machine for spinning or winding. The invention reduce the sophistication of the design for the heat removal from interior spaces of a control cabinet of a textile machine for spinning or winding which is heated by the operation of electric and electronic instrument. It is a characteristic of the invention that the cooling air channel (K) is constituted by several tube-shaped segments (Q2, Q2, Q3, Q4). A pipe-shaped segment (Q1) is formed by the arrangement of two inverting rectifier modules (30, 31) in the horizontal plane of a frame (13) of the control cabinet (12).

Abstract: A process and device to detect and count yarn defects in a yarn segment including a camera (5), a computer (8) and an image processing program. The yarn (30) is illuminated with an intensity dependent upon the thickness of the yarn (30) and is photographed by the camera (5). The photographed image is digitalized in the computer with the image processing program and low-contrast points are filtered out. The remaining points are gathered together into coherent areas the sizes of which are classified into predetermined size classes and are stored.

Abstract: To spin a yarn with an open-end rotor spinning device, the fibers are fed to a fiber guiding surface from which the fibers are deposited on the sliding wall of a spinning rotor after passing over a gap. At the same time, an air stream is guided through the gap into the interior of the spinning rotor and is then removed from the interior of the spinning rotor without passing through the gap again. To produce the air stream, a device for the production of a pressure drop which produces the air flow flowing into the interior of the spinning rotor is assigned to the gap (17).

Abstract: A fleece hopper of a textile draw frame is located between a pair of draw-off rollers and a fiber sliver pipe. Fiber fleece is gathered together in the hopper and deflected into the hopper outlet. The hopper outlet includes a pipe-shaped insert removably fitted therein. The insert can be removed and replaced without disturbing or adjusting the hopper itself.

Abstract: The invention is a process and a device for the jigging of a flat can in a textile draw frame. According to the invention, the flat can is subjected to different dynamic moments in the translational movement along the jigging path. It is a characteristic of the invention that the speed is regularly modified in proximity of the reversal points (P1, P2), i.e. in the area of the reversal paths (UW1, UW2). The jigging device is provided with a driving device which renders the constant translational movement changeable in proximity of the reversal point (P1, P2). The driving device may be a servomotor controlled by a computer which serves as the control device. In another embodiment the diving device is a different, less expensive electric motor on the drive shaft of which belt pulleys capable of being coupled are installed.