Abstract: The yarn traversing guide is slidably mounted within a pair of slats disposed across the face of the drum housing for reciprocating motion. Each slat is provided with a rigid center section and two spring-elastically deflectable end sections. The end sections deflect to a limited degree during reversing of the high speed traversing guide without impairing the life of the traversing guide.

Abstract: A method of and apparatus for catching, severing and sucking-off a continuously arriving thread and rethreading said thread onto a new empty bobbin tube, wherein the thread is caught in the zone of a thread traversing triangle, severed and continuously sucked off, retracted from the zone of the bobbin package and after the bobbin change the thread is inserted into the bobbin tube and the incoming thread is taken up by the bobbin tube and simultaneously is severed from the thread end extending to the suction device.

Abstract: A chuck device for a tube used for supporting thread packages of textile yarns or threads comprisng a thread severing ring provided with protruding substantially tooth-shaped cutting elements and an adjacent thread guide ring which, for the purpose of guiding the thread in a direction towards the thread severing ring, is provided with a thread guide surface extending beneath the cutting elements and an adjacent extension or projection. The extension has recess means and radially movable clamping means are arranged in the recess means. At the operational rotational speed of the chuck the radially movable clamping means in conjunction with the cutting elements form clamping points or locations for the thread caught therebetween.

Abstract: A pneumatic measuring means is placed over the main cylinder to measure pressure variations due to changes in fiber layer thickness. The measured pressures are transmitted to a measuring and control means which compares the measured pressures to a pre-set value and produces a difference signal which is then used to control the card. The difference signal can be imposed on the supply means for the card, the doffing means or the drafting means.

Abstract: A bobbin tube clamping device for a bobbin chuck for textile bobbins comprising a tubular sleeve member for supporting the textile bobbin tube and a chuck member movable within the sleeve member in the axial direction of the bobbin chuck. The bobbin chuck contains at least three openings extending substantially in the axial direction of the lengthwise axis of the bobbin chuck. Each opening is provided with at least two guide surfaces for guiding an associated bobbin tube clamping element. The portion of the bobbin tube clamping element which is guided by the associated opening is substantially segment shaped at least at its end protruding from the bobbin chuck and the oppositely situated parallel surfaces or walls of such segment-shaped end of the bobbin tube clamping element slidingly contact the guide surface of the associated opening.

Abstract: An apron drafting arrangement for fibrous material comprising a pair of back rolls, a pair of intermediate rolls, a pair of front rolls, the intermediate pair of rolls including a top roll and bottom roll. Deflecting elements are arranged to each side of such top roll and a top apron is loosely placed about the top roll and about such deflecting elements. The deflecting elements, viewed in the direction of material flow, are located upstream and downstream of the top roll of the intermediate pair of rolls. A top apron guide cage takes up the top intermediate roll and the deflecting elements and a bottom apron is loosely guided about a respective deflecting element located upstream and downstream of the bottom roll of the pair of intermediate rolls. The intermediate pair of rolls is arranged closer to the downstream located deflecting elements.

Abstract: The electrical circuit between the power supply line and each motor or motor pair has an apparatus for re-transferring power from one mechanically driven and/or electrically braked motor to another of the motors. This apparatus includes a levelling or equalizing circuit and a plurality of back coupling devices such as diodes arranged in opposition in series. Each back coupling device electrically connects the intermediate DC circuit loosely to the levelling circuit. Upon braking of a motor, the power flows back through the associated intermediate circuit and then via the back coupling devices and levelling circuit to the other motors.

Abstract: The fiber collecting groove is located at the largest inside diameter of the rotor and is formed by two surfaces which define an angle of aperture .alpha. from 45.degree. to 90.degree.. The bottom of the groove is of a radius of from 0.1 to 0.5 millimeters. Also, the bisector of the angle of aperture .alpha. forms an angle .beta. with the plane of rotation of the groove of a value from 0.degree. to 45.degree. while the yarn take-off direction forms an angle with the plane of rotation of from 0.degree. to 25.degree..Trash accumulations are reduced to a minimum without detrimentally effecting yarn quality.

Abstract: An apparatus for supplying or charging a spinning preparatory machine with cans transported on transporting trolleys and moving to and from a can filling position of the spinning preparatory machine. There is provided a revolving can transporting device which is driven incrementally or stepwise and which contains a plurality of essentially equally spaced can entrainment members for entraining or engaging empty cans placed upon the transporting trolleys and for moving such cans into the spinning preparatory machine where the empty cans are filled and for moving the refilled cans back onto a transporting trolley. Further there is provided a trolley shifting device which can be moved substantially at right angles to, and outside the path of, the can transporting device, the trolley shifting device being movable in coordinated stepped sequence to the movement of the revolving can transporting device.

Abstract: A measuring head is used to measure a yarn characteristic while generating a continuous signal proportional to variations in the measured characteristic. The signal is multiplied by an identical second signal obtained either from a second measuring head located downstream of the first measuring head a distance corresponding to a predetermined periodic interval of yarn length (L) or by a time-delay of the first signal corresponding to the periodic interval (L). The multiplication of the signal deviations occurring at the periodic intervals, should such be present, produces a strong output signal indicative of the yarn irregularities. This output signal can be used to interrupt operation of the yarn processing machinery.

Abstract: The drive system is used for spinning, twisting or false-twisting machines. The spindles are driven by a tangential drive belt which is tensioned between a drive roll and a tensioning roll. The tensioning roll is mounted by a lever to pivot about a fixed axis. In addition, a rotatable axle is mounted about the fixed axis in order to drive additional working elements of the machine. The tangential belt is maintained under constant tension by a biasing means which biases the lever about the fixed axis.

Abstract: A method of, and apparatus for, automatically changing textile bobbins on a cantilevered bobbin chuck of a textile winding machine, wherein there is cut and sucked-off a thread moving towards a textile bobbin package placed on the bobbin chuck, the textile bobbin package is removed from the stopped bobbin chuck and transferred to a bobbin transporting device held in readiness, then positioning an empty bobbin tube, placing the empty bobbin tube onto the stopped bobbin chuck, and rethreading the sucked-off thread onto the empty bobbin tube placed on the bobbin chuck which, in the meantime, has been set into rotation.

Abstract: Apparatus for applying preparation agents onto a large filament bundle passing through substantially vertically, comprising an applicator head with a slit for applying the preparation agent and at least one guide edge for guiding the filament bundle. A supply duct supplies the preparation agent to the slit. The applicator head consists of at least two opposite surfaces forming the slit and the guide edge, which surfaces are provided at least in the slit with a roughness assisting the distribution of the agent in the slit.

Abstract: The speed of the friction drive drum is electronically controlled as a function of the thread speed. The apparatus allows winding of a precision wound package or a random wound package. The apparatus employs an electronic control unit which calculates a desired value signal for the speed of the drive drum as a function of the thread speed from a mathematical formula and compares this value to the actual value in order to obtain a correction signal for the drive of the drive drum. A similar calculation is also made for controlling the speed of the traversing thread guide shaft.

Abstract: A pneumatic measuring means is placed over the main cylinder to measure pressure variations due to changes in fiber layer thickness. The measured pressures are transmitted to a measuring and control means which compares the measured pressures to a pre-set value and produces a difference signal which is then used to control the card. The difference signal can be imposed on the supply means for the card, the doffing means or the drafting means.

Abstract: A bobbin package storage box which is movable on at least one rail and provided with an endless chain revolving in a substantially vertical plane. A bobbin transfer point associated with a winding machine is located at a region along the path of travel of the chain. Bolts or pins provided on the chain support full textile bobbin packages. The chain extends substantially parallel to the longitudinal direction or the direction of movement respectively, of the storage box, and the position of the bolts at the bobbin transfer point is variable while the bolts in an idling position are maintained in a predetermined position.

Abstract: The bobbin chuck is provided with a pneumatically operated bobbin tube holding means and is arranged to be pivoted against a brake shoe to be braked to a standstill. The brake shoe is pivotally mounted about a remote axis and is movable radially of this axis when engaged by the rotating bobbin chuck. The brake shoe has a push-off piston which closes off a pneumatic connection from a pressurized chamber in the brake shoe and the bobbin tube holding means as the brake shoe is pivoted under the braking momentum generated by the bobbin chuck during braking. After braking and disappearance of the braking momentum, the pressure in the pressure chamber causes the brake shoe to pivot in the opposite direction and thus opens the pneumatic connection to the bobbin tube holding means. The tube is then released.

Abstract: The current circuit arrangement is used to reduce the switch-on power dissipation of a power transistor which intermittently switches a direct-current voltage to an ohmic-inductive load and in which a voltage limiting diode is arranged parallel to the load. The current circuit arrangement employs a non-linear resistance member in series with the diode which resistance member includes at least one additional diode. In addition,a reactance member is used in parallel to the resistance member. Various one-phase and three-phase invertor stages may use the current arrangement.

Abstract: The deviations in measuring the density of the fiber strand caused by manufacturing tolerances in the take-off rolls are monitored by integrating the deviations in densities from a preset value over periodic intervals in a control device. The integrator is controlled by periodic impulse signals and is used to adjust the transporting air stream so as to regulate the pressure drop to achieve an even strand.

Abstract: Two bobbin tubes are mounted on a common bobbin chuck and a common thread severing means and suction means is used to sever and hold the threads during a bobbin change. After the threads are severed and drawn into the suction tube, a rod which carries two thread holders and the suction tube are pivoted into the thread path and around the fresh empty bobbin tubes on the chuck. A second pair of thread holders guide the threads during this time. After re-threading on the bobbin tubes, the rod and suction tube are returned to their initial positions to place the threads into respective reserve winding devices and thread guides.