Classifications

• • D—TEXTILES; PAPER
  • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
  • D06B—TREATING TEXTILE MATERIALS USING LIQUIDS, GASES OR VAPOURS
  • D06B3/00—Passing of textile materials through liquids, gases or vapours to effect treatment, e.g. washing, dyeing, bleaching, sizing, impregnating
  • D06B3/34—Driving arrangements of machines or apparatus
  • D06B3/36—Drive control

Definitions

• the invention relates to a control device of the type corresponding to the preamble of claim 1.
• Such a control device is known from practice. It is a control device for a textile finishing system in which the web is conveyed in the running direction by a number of successive driven pairs of nip rollers. Between two successive pairs of squeeze rollers, a pendulum roller is provided in the web, which controls the preferred speed of the subsequent or the previous pair of squeeze rollers.
• the pendulum roller is connected to the tap of a potentiometer on which there is a voltage dependent on the setpoint. Using the potentiometer, an additional voltage amount can be applied to the speed controller of the respective motor, which corresponds to a fraction of the setpoint, for example 20%.
• the invention has for its object to accelerate the setting of proper conditions when starting a multi-engine system.
• the maximum correction value is derived from the target value and is a fraction of the target value given by the resistance conditions on the potentiometer.
• the actual instantaneous correction value is again only a fraction of the maximum correction value determined by the instantaneous system deviation.
• the actual correction value can therefore be very small with small setpoints in the start-up phase, so that the setting of stationary conditions takes a long time.
• the invention now includes that the maximum correction value proportional to the desired value is replaced by a fixed higher amount, so that the setting of stationary conditions is faster. From a certain target value or a certain running speed of the web, the transition to the correction values proportional to the target value, which are then also large enough and mean sufficiently large speed differences, takes place again, the rapid corrections in the event of deviations from the target conditions enable.
• the measuring device for the path length between two successive drive stations can comprise a potentiometer, the tap of which is connected to a pendulum roller lying in the path.
• a voltage proportional to the setpoint is applied to the potentiometer, and a fraction of this Depending on the position of the pendulum roller or the tap, this voltage is additionally switched to the speed controller of one of the neighboring motors.
• the gate keeps the voltage derived from the target value away from the respective potentiometer in the lower region and instead outputs the fixed, larger correction value.
• the gate can be implemented in the manner described in claim 4.
• the drawing shows an embodiment of the invention in the form of a control device for a textile finishing system.
• Fig. 1 shows a circuit diagram of the system
• FIG. 1 shows a textile fabric web 10 which, in the direction of arrow 20, runs through a plurality of nip roller pairs 1, 2, 3, 4 one after the other, between which the individual machines of the finishing system are located, which are not shown but only by the interruptions 5,6,7 of the web 10 are indicated.
• pendulum roller arrangements 15, 16 and 17 which, as shown in the pendulum roller arrangement 15, have two arranged at the same height Include deflecting rollers 8, 9, via which the web 10 is guided into a loop 10 ′ running downward, in which the actual pendulum roller 18 lies below.
• the pen delroller 18 is guided on both ends of the links 25 which are approximately horizontal in the normal position shown in the drawing.
• the links 25 thus have a swivel range, the limits of which are designated 25 'or 25 "in FIG. 1.
• the links 25, 26, 27 of the pendulum roller arrangements 15, 16, 17 are connected to the tapping of potentiometers 31, 32 and 33 via connecting links 28, 29, 30 which are only indicated in FIG. 1.
• a different voltage signal is tapped at the potentiometers 31, 32, 33, which signal is available for the respective position of the pendulum roller or between the pinch roller pairs 1, 2, 2, 3, and 3, 4 Web length is representative.
• the parts 18, 25, 28, 31 and 18, 26, 29, 32 and 18, 27, 30, 33 thus form measuring devices for the respective web length.
• the squeeze roller pairs 1, 2, 3, 4 are driven by electric motors 11, 12, 13, 14, the first three motors being assigned speed controllers 21, 22, 23, each of which has two inputs 21 ', 21 "and 22 ', 22 "or 23', 23".
• the signals from the associated potentiometers 31, 32, 33 are located at the inputs 21 ', 22', 23 '.
• the motor 14 of the pair of squeeze rollers 4 is the master motor , whose speed controller 24 has only one input 24 ", on which the setpoint value for the speed of the system as a whole is given to it. Only in the case of the other squeeze roller pairs 1, 2, 3 is it necessary to compensate for any lengthening or shrinkage that occurs during the passage of the web, which is brought about by the values tapped at the potentiometers 31, 32, 33.
• control signals are in the form of voltages.
• the setpoint generator 34 outputs, for example, a negative voltage in the range from -0.5 to -10 volts at its output Speed range of the web from 5 m / min to 100 m / min corresponds.
• the output voltage of the setpoint generator 34 is increased in an arbitrary time dependency according to the amount as the conditions of the system allow, in order to reach the stationary working speed of 100 m / min as quickly as possible.
• the operational amplifier 35 In the operational amplifier 35, only a sign reversal is carried out, so that a positive. sitive voltage in the range from +0.5 volts to +10 volts appears, which is fed via line 43 as the basic setpoint to the inputs 21 ", ..., 24" of all speed controllers 21, ... 24 .
• the output voltage of the operational amplifier 35 reaches the input 38 of the operational amplifier 40 and the input 46 of the further operational amplifier 41 via the line 44.
• a constant voltage source 36 is assigned to the operational amplifier 40, at which a selectable but fixed negative voltage can be tapped via a potentiometer 37, which is applied to the second input 39 of the operational amplifier 40.
• the operational amplifier 40 has the property that it outputs one of the total input voltage at the inputs 38, 39 the same output voltage at its output 42, but only does so as long as this total input voltage is negative. Only in this case does a signal appear at the output 42 of the operational amplifier 40, which is connected to the one input 45 of the further operational amplifier 41, the setpoint of which lies at the other input 46.
• the operational amplifier 41 has the property of outputting a sign of the opposite output voltage corresponding to the total input voltage, which is present at point b and is fed via line 47 to the input 48 of an identical operational amplifier 49, which in turn supplies the pre sign reverses and a corresponding tension on the Point c there.
• the corresponding connections of the potentiometers 31, 32, 33 are connected to the points b and c. The lines are omitted in FIG. 1 for reasons of clarity.
• the correction signal which arises at the inputs 21 *, 22 ', 23' would thus be a maximum of 20% of the instantaneous setpoint, namely when the pendulum roller in question is completely in its end position. If the system is started up with a basic speed of 5, which corresponds to the setpoint of 0.5 volts, there is only a maximum correction value of 1 m / min. With such a small difference in speed between a pair of squeeze rollers and an adjacent one, it takes a long time until a certain deficit in the web length has been drawn out.
• the correction value below a certain limit setpoint that is set on the potentiometer 37 is not proportional to the setpoint, but a fixed value that corresponds to the voltage value set on the potentiometer 37.
• this voltage value is -2 volts.
• This voltage is present at input 39.
• the setpoint at the output of operational amplifier 35 is also found at input 38 of operational amplifier 40, namely as a positive voltage.
• the total input voltage is thus the sum which appears in changed polarity, that is to say as a positive amount, at the output 42 and reaches the input 45 of the operational amplifier 41, on the other input 46 of which the likewise positive setpoint voltage lies.
• the operational amplifier 40 additionally supplies the voltage that the target value lacks in the amount of the limit voltage set on the potentiometer 37.
• FIGS. 2 and 3 show a diagram in FIGS. 2 and 3.
• 2 shows a pure linearity, with very low correction values occurring in the lower speed ranges, which result in long start-up times until stationary conditions are set.
• Fig. 3 it can be seen that in the initial phase up to the set 2 volts, the voltage at points b, c is constantly 2 volts, which results in larger correction values.
• the relationships are shown in FIG. 4 in relation to the speed.
• the middle straight line represents the target curve, ie practically the speed as a function of the target value, as is present on the pair of squeeze rollers 4, which is driven by the guide motor 14.
• the straight lines 61, 62 above or below indicate the limits of the correction value that can be supplied by the potentiometers 31, 32, 33, which in the exemplary embodiment is + 20% of the value of the respective point on the curve 60. If the pendulum roller 18 is in an end position, a correction value of the curves 61 or 62 results. If the deviation from the target position is only slight, the actual correction value lies somewhere between the curves 61 and 62. Above the target value 2 Volts, curves 61, 62 are proportional to curve 60.
• the curves 61, 62 take the courses 61 ', 61 "in which they are parallel to the curve 60, ie a maximum amount of tension can be expected as the maximum correction value when the pendulum roller 18 is in the end position
• the limit curves 61 ', 62' merge into the curves 61, 62 which are proportional to the set point a, ie the maximum correction value is then proportional to the set point.
• the -2 volts set on the potentiometer 37 are only one feature of the exemplary embodiment.
• This limit voltage or limit speed, up to which a constant larger correction voltage corresponding to the set limit value can be applied independently of the actual current setpoint, can also be selected differently.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
• Treatment Of Fiber Materials (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6417701

Family Applications (1)

Country Status (2)

Citations (3)

• 1990
  • 1990-11-06 DE DE19904035188 patent/DE4035188C1/de not_active Expired - Lifetime
• 1991
  • 1991-10-22 WO PCT/DE1991/000823 patent/WO1992007986A1/de active Application Filing

Patent Citations (3)

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