Barmag Ag

Barmag Barmer Maschinenfabrik Ag

Gerhard Martens

Heinz Schippers

Karl-Werner Frolich

Erich Lenk

Herbert Turk

Manfred Mayer

Uwe Baader

Werner Pieper

Karl-Ludwig Rafflenbeul

Lothar Schewe

Siegfried Putsch

Gunter Honigmann

Yarn advancing heated godet having temperature controlling sensors

An apparatus for driving a plurality of motors at different variable speeds. The apparatus includes a rectifier for supplying direct current power to a dc bus circuit. A plurality of inverters are connected to the dc bus circuit and each inverter drives a respective motor. Each inverter is controlled by an individual controller connected thereto for controlling the frequency of the output of the inverter to thereby control the speed of the associated motor. The inverters are preferably mounted on a common heat sink to reduce electrical and mechanical complexity. The apparatus permits the rectifier and the dc bus circuit to be sized to handle a maximum rating of less than the sum total of maximum loads of each of the motors. The dc bus circuit also serves to distribute energy generated by a slowing motor, for example, to other motors driven from the bus circuit. A chopper resistor may be included and switched across the dc bus circuit to provide braking to the motors.

Frequency inverting apparatus

The yarn tension at each of a plurality of yarn processing stations is continuously monitored, while continuously determining the mean value of the monitored tension at each station, and while also continuously determining the differential between the monitored value and the mean value. Also, an alarm signal is generated whenever the mean value leaves a predetermined tolerance range, and whenever the differential value leaves a second predetermined tolerance range. An alarm signal may serve to actuate a visual error indicator, or to shut down the associated processing station.

Method and apparatus for monitoring the tension of an advancing yarn

A method and apparatus to centrally collect measured values of a variable parameter from each of a plurality of work stations, and so as to facilitate quality control. Each work stations includes a sensor for generating an output signal which is a function of the variable parameter, and the output signal is converted to digital signals, which represent discrete increments within the measuring range of the variable parameter. The digital signals are stored during a predetermined period of time in a memory unit so as to be available for periodic scanning by the central computer, after which the stored signals are cleared so that the memory unit is free to record the values during the next period of time. Also, circuitry is provided whereby only the extreme values of the output signalsd ar stored, together with the mean value, which are adequate to provide a complete statement of the quality of the process and product being monitored.

Method and apparaus for centrally collecting measured values

A method and apparatus for producing a ribbon free randomly wound yarn package is disclosed, and wherein a plurality of critical winding ratios at which undesirable pattern formations or ribbons would normally occur are determined and stored in a microprocessor control unit. During the winding operation, the spindle speed and traversing frequency are monitored by sensors and are transmitted to the control unit, and the control unit computes the optimum time for rapidly changing the traversing frequency so that the actual winding ratio moves rapidly through each of the approaching critical winding ratios. The original traversing frequency is re-established after having passed beyond each of the critical winding ratios.

Ribbon free wound yarn package and method and apparatus for producing

A method and apparatus for winding textile yarns into core-supported packages is provided in which the formation of thickened and hardened places in the yarn packages at opposite ends thereof are avoided by a recurrent series of stroke modification cycles in which the length of traverse stroke is varied aperiodically as determined by a random number sequence. Additionally, the formation of undesirable patterns in the windings of yarn forming such packages is avoided by continuously varying the speed of traverse of the yarn guide by accelerating and decelerating the traversing yarn guide between predetermined maximum and minimum speeds. The stroke modification cycles and traverse motion speed changes are coordinated in such manner that the periods of high traverse motion speed coincide with the periods of short traverse stroke length and vice versa.

Method and apparatus for winding textile yarns

A method and apparatus for winding textile yarns into packages are provided in which the formation of undesirable patterns in the windings of yarn is completely avoided. According to this invention, any one of the variable parameters of traverse motion speed, such as time intervals between reversals from acceleration to deceleration or vice versa, traverse motion speed attained between such reversals or changes, or rates of acceleration or deceleration, is varied aperiodically, and the control of such speed changes may be accomplished digitally or analogically in response to a random number sequence.

An inductively heated godet is mounted on a supporting frame which carries a rotatable drive shaft. A stationary primary winding is mounted about a magnetic core carried by a body which is fastened to the frame. A rotatable hollow shell which concentrically surrounds the primary winding is removably secured to the rotatable drive shaft. The magnetic core and rotatable hollow shell have in their longitudinal section essentially opposing L-shaped profiles with the flank portions thereof being concentric to the godet turning axis and the foot portion of each L-shaped profile extending substantially radially with respect to the godet turning axis toward the opposing flank portion of the other L-shaped profile such that the flank and foot portions of the shell and magnetic core form radially spaced annular gaps therebetween which are concentric to the godet turning axis. In addition, the axially directed gaps necessarily formed between the magnetic core and rotatable hollow shell are relatively large with respect to the annular gaps so that magnetic flux created by the primary winding will flow almost entirely over the smaller annular gaps. In one embodiment, the foot portion of the L-shaped profile of the shell has a recess formed therein which may be filled with an electrically conductive material which helps direct the magnetic flux and increase the heating effect in that zone of the shell. In another embodiment, the primary winding is formed of multiple electrically interconnected partial coils which are slidable on to the magnetic core.

Growing community of inventors

Remscheid, Germany

Gerhard Martens