Textiles: knitting – United needle machines – Straight
Patent
1989-07-21
1991-02-05
Schroeder, Werner H.
Textiles: knitting
United needle machines
Straight
D04B 2322
Patent
active
049894234
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a warp knitting machine whose guide bars are displaced according to a pattern by means of displacement step motors, which obtain their displacement information in the form of a certain number of displacement pulses (displacement pulse number) from a pattern memory in a control device.
An apparatus for this type of control of a warp knitting machine is known from the German Pat. No. 24 19 694. A warp knitting machine controlled in this manner must be shut down, for example during work interruption overnight and operation interruption can also occur through power failure.
During shut down, power failure and in particular through short-time power interruption it can not be excluded that disturbances overlap the displacement pulses so that the guide bars are in a false displacement position. It is therefore the object of the invention to insure that the guide bars retain their correct positions according to the pattern when restarting.
In accordance with the invention this is achieved in that each guide bar is connected to the indicator of an electrical proximity switch, for detecting and correcting the position of the guide bars of a warp knitting machine shut down in the underlay position, whose sensor is mounted on a measuring slider shiftable in the displacement direction of the guide bars. The slider is shiftable over the displacement region of the indicator by means of a measurement step motor beginning from a starting position, which corresponds to the zero-position of the guide bar. In addition, a pulse counter is provided for counting the steps of the measurement step motor during this shifting until the indicator and sensor coincide and counted number is compared by means of a comparator with the displacement pulse number taken from the pattern memory, which defines the required shift according to the pattern. The correction pulse number determined as the difference in the comparator is supplied to the respective displacement step motor.
In this manner the respective positions of the individual guide bars are determined absolutely by means of the measurement slider when the warp knitting machine shuts down in the underlay position, namely by counting the steps of the measurement step motor when shifting the measurement slider in the form of electrical pulses where an individual number of pulses results for each guide bar. The counting of these pulses begins at a starting position of the measurement slider, which corresponds to the zero-position of the guide bar or respectively guide bars. This number of pulses taken as the result of a pulse counter which counts the steps of the measurement step motor is then compared with the displacement pulse number which is available as displacement information from the pattern memory in the control device and which indicates the position which the concerned guide bar should retain depending on the stored pattern. This comparison of the displacement pulse number obtained from the pattern memory with the count result of the mentioned pulse counter then takes place by means of a comparator. The difference determined by this comparison represents a correction pulse number, which is then supplied to the respective displacement step motor. The displacement step motor, depending on the sign of the difference determined in the comparison, then carries out a corresponding number of steps in the forwards or backwards direction, whereby the concerned guide bar is brought into the position where it should be according to the displacement pulse number taken from the pattern memory. The warp knitting machine can then be started again and the guide bars are located in the correct position for the respective pattern.
Since a warp knitting machine normally is equiped with several guide bars, one can mount several sensors on one measurement slider which is shifted by one common step motor for measurement. When the individual indicators pass over the respective sensors, the number of steps up to that point are stored for the indicator and its associated gui
REFERENCES:
patent: 4570462 (1986-02-01), Roth
patent: 4611475 (1986-09-01), Bergmann
patent: 4614095 (1986-09-01), Porat
patent: 4761973 (1988-08-01), Gangi
Knitted Outerwear Times, 48-Bar Raschet Has Unit Operator at 260 RPM, vol. 37, No. 42, 10-1978, pp. 86-87.
Calvert John J.
Liba Maschinenfabrik GmbH
Schroeder Werner H.
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