CS216203B2 - Method of controlling the pull tension at winding up the material bands on the roll and device for performing the same - Google Patents

Abstract

1429565 Winding webs KATAOKA MACHINE PRODUCT CO Ltd 17 July 1973 [17 July 1972] 33899/73 Heading B8R A method of controlling the tension in a wound web roll comprises the steps of continuously detecting the radius of a wound web roll, calculating the tension based on a theoretical equation and on the detected radius and applying the calculated tension to a comparison unit which stores a preset tension value to produce an output signal corresponding to the difference of the tensions compared in the unit for the purpose of controlling the winding torque applied to the wound web roll. In operation a required tension value F 0 and a tension gradient # are applied to a setting unit 10, Fig. 1, whose output forms the preset value stored in the comparison unit 11. The stored value is compared with a signal corresponding to a detected radius and emitted by detecting means 15 associated with the web roll spindle 14. The comparison unit 11 emits the torque controlling signal which is amplified in an amplifier unit 12 in turn producing an output signal which is applied to a torque actuator 13 which controls the torque applied to the spindle 14. The winding apparatus may include a plurality of web roll stands 78, Fig. 11, each supporting a plurality of pivotal arms 79 carrying respective spindles 83 on which are wound the web rolls 94. Web rolls 94 are formed from a wide web 30, fed over guide rollers 97, 98, 100, 95 and slit into a plurality of webs by a slitter 99. The arms 79 are biased by power cylinders 82 to control the nip pressure between web rolls 94 and the presser roller 95. The spindles 83 are driven by motors 90 and torque actuators 84 over belt drives 92, 89, 87 and gears 86, whereby the torque is controlled by radius detectors 81, connected to the pivotal shafts 80 of the arms 79 by endless chains 93 to indicate the angular displacement of the arms as a function of changing web roll radius.

Description

SUMMARY OF THE INVENTION The present invention relates to a method for controlling the tally voltage of a winding device and a device thereof. Concerns . in particular. tensile stress control systems for sheet winding devices and the like, with a center shaft drive, or both, a surface friction drive.

When winding a web of paper, plastic film, fabrics and the like onto a winding core with a central shaft drive, i.e. in the manufacture of coils, the commonly used method consists in arranging a differential mechanism, such as a hydraulic circuit, during winding. or · a transmission for the relationship between the touch and take-up roller drives.

In this case, due to the principle of differential mechanisms, an insufficient winding torque develops at the expense of the inversely proportional decrease in the torque moment after the winding radius is increased, especially when the winding load is increased. 'It is - in practical use, considerably irrational. - Therefore - the brake - and the applied torque - on the side - are connected to the - touch cylinder. touch roller - is controlled. Thus, winding is performed very laboriously. According to. . the value of the stress applied to the web to be wound during the winding is not itself a process value. The disadvantage of this prior art is that human work is needed, based on the operator's vision and touch, to monitor the condition of the take-up roller or the moving belt of the material and. -hand touching the roller or belt. A relatively accurate known method has been applied to a device in which the control. the signals - and the output torque are directly or - approximately directly dependent, and which are connected - with - the torque supply control device, - wherein the winding radius increase signal - is directly used as the control signal of the control device and its ¹ limits are mechanically - in advance. - so that winding takes place - with a theoretically constant voltage - or »with a pre-set course of such ·. -Tension. In this case - setting the values - voltage. can readily. controlled by an adjuster, for example a variable resistor on the outer control board and the like. Although the gradient is such a voltage or voltage reduction. between the initial and. The ultimate winding - the most important - value in this winding method, cannot - hc - be changed other than by changing the mechanical bond - between the winding radius and the sensor. In addition - there is a.-Signal for · Control the twisting. - torque '.-control · device - apply - directly ·. as a radius signal. - the winding, so that the value of such a tension acting on the web during winding is not a factor in itself which must be disadvantageously processed.

The known methods are - as already mentioned - disadvantageous. in terms of performance and maneuverability. In addition, when used, for example, in rewinders, the means associated with the control device and the means for detecting the winding radius and generating a control signal such as variable resistance, dimensionally large and large capacity, must be connected to the winding arm. To ^; it leads to further disadvantages and increases the design and degrades the quality of operating characteristics, makes maintenance and inspection difficult.

Because contrary winding arm must be as lightweight · very careful to be sensitive to · adjust · the contact pressure on the wound roll, it can be difficult to ¹ · method generally used.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method of controlling such stresses in which tensile stresses are gradually reduced based on predetermined relationships as the winding radius of the coil increases so that coils with good appearance can be produced. that these can be suitably controlled by tightening each wound layer.

Another object of the invention is to provide a method of automatically controlling the winding torque depending on the sensing of the winding coil radius and the winding of the strips while maintaining such a tension at a suitable value even if the tension cannot be detected directly before the winding coil; Finally, tensile stress control, even if it cannot be processed as an accurate value for the surface friction drive of the coil.

The object of the present invention has been solved by designing a method for controlling tensile stress at. winding strips of material onto coils in which:. is continuously measured · winding · coil radius a. driving torque - · coil controlled · v. depending on its radius, - whereby the value of tensile force is calculated in the computer from the value of the sensed. signal ^: corresponding to · sensed. ·.-Radius. coiled 'coil. according to predetermined. the equation, the calculated value, is multiplied by the · value ·. the sensed radius signal, whereupon the driving torque of the coil is adjusted. depending on the value of the product obtained. ':. .

In order to carry out the method according to the invention, a winding device has been proposed. spindle ·· and 'is' him. and an instantaneous winding sensor of the coil of which the winding shaft is arranged on. at the free end of the rocker arm in contact with the counterspindle and a group of rollers for feeding the web of material, wherein an electric transducer of the angular position change of the rocker is arranged on the support of the device. the belt winding is driven via a toothed transmission and a belt first transmission, a belt second transmission, a belt third transmission from an electric motor, the sensor being driven by a chain drive a fourth transmission. the belt drive first transmission and its output is connected to the input. comparative control unit whose output is. connected to the torque control. torque. ,. . . .. .......

According to the invention, the tensile stress is controlled electronically by controlling its two components, the tensile stress value and the tensile stress gradient value, and in addition, the tension and torque can be directly determined and the tensile stress can be controlled simply by adjusting the dial to achieve the advantages of good performance and tensile stress control that is stable during operation is easy and accurate.

In the case of cutting several narrower strips of different widths from a wide feed belt and winding the narrower strips as individual coils, it is possible to carry out the automatic control so that the adjusting members of the individual wound rollers are independently controlled to the desired suitable values. easy adjustment of tensile stress.

Since an electrical signal is derived from the mechanical part of the device, which is subjected to logical control from the outside by the control device, and the resulting control signal is re-routed to the mechanically operating part of the device, the further advantage of the invention is that the mechanical part can be simple, small and · Easy to maintain and · control.

The invention will now be described, by way of example, with reference to the accompanying drawings, in which:

Fig. 1 is a basic block diagram of a device according to the invention; Fig. 2 shows a block diagram of an apparatus using an analog control system; Fig. 3 shows a block diagram of an embodiment using a hybrid analogue digital control system; diagram of tensile stress versus winding radius, fig. 5 diagram. · 'Course' of the winding · torque · depending on the winding · radii; .. ·:

olbr. 6A, 6B, 6C ' Voltage depending on. on the winding radius at a different voltage gradient, FIG. 7 shows a side view of the winding device according to the invention,

Giant; fy: 9 · side and top view. ' winding device. Fig. 10 is an enlarged partial cross-sectional view taken along the plane X - X of the device of Fig. 8;

FIG. 11 is a side view of a three-spool winding device: FIG. 1 '' is a '' basic block diagram. The device according to the invention, which consists of an adjusting unit. 10, na. whose first input 103 - - is applied to the pulling force signal at the first thread. · · A. . . on which the second input 104 receives a proportional change signal. β tractive forces. Output · 105. the adjusting unit 10 is connected to. the first input 111 of the comparator circuit 11, the second input 112 of which is coupled to the sensor output .. 15 of the radius. K. the output 113 of the comparator circuit 11 is. the input 124 of the amplifier 12 is connected to the output 125 of which the control input 132 of the torque controller 13 is coupled to the winding shaft 14 at which the radius sensor 15 is arranged, as shown in the block diagram of FIG. 1 is shown as the connection of the winding shaft 14 to the radius sensor 15. The comparator circuit 11 is additionally provided with an outlet. 114 of the tensile force signal F, and the amplifier 12 is provided with an output 126 of the signal I of the amplifier.

The block shown in dashed line in FIG. 3 is a self-adjusting unit, conceived as an automatic control means of a mechanical device accompanying a change in the sensed belt width. Usually, the level of the sensed level is given as a condition proportional to the sensed width. The fact that the level, the voltage is not adjusted manually by the operator of the device, but automatically, is very advantageous in order to reduce the work involved and to facilitate automation.

According to the invention, the winding torque is controlled by using the coil winding radius signal to calculate according to the theoretical equation and that the tensile stress value thus obtained is compared to the tensile stress value previously set. The theoretical equation shall be used:

F = Fo (1- beta

R - Rmiin

Rmax (Rmin delta) where:

R winding radius of the lamp (imm ·).,

Rmin winding coil radius at start of winding (mm),

Rmax winding coil radius at winding end (mm),

Fo tensile stress n at the start of winding (Ikg / cm), beta (Fo - Fl) Fo (F1 stands for tensile stress at maximum coil radius) tensile stress gradient coefficient between start · and end of coiling, delta any rational positive number for example 1 / 2, 1 and 2.

The characteristic curve of the relationship between the winding radius and the tensile stress: controlled on the basis of the theoretical equation is shown in Fig. 4, the voltage gradually decreasing from Fo to F1 within the winding radius Rmin of the coil at winding and winding radius Rmax at the end of winding .

The location diagram of an analog computer circuit for calculating the value of the tension winding voltage F from a signal of any coil radius R using the theoretical equation is shown in Fig. 2.

On cibir. 2 is a block diagram of a particular embodiment of the apparatus of FIG. 1 using an analog control system.

The individual blocks of FIG. 1 are shown in such a way that the source 101 of the setpoint tension F0 and the source 102 of the setpoint value of the relative change of β-stroke are evident, the signal processing process Fo, β in the comparator circuit 11 is internal. connecting an integrator 127, a thyristor controller 121, and a switching circuit 122 to which a current sensor 123 is connected in the feedback branch. The twisting moltenity controller 13 and the winding shaft 14 provided with the radius sensor 15 described above are then connected to the output of the amplifier 12 in the manner described in FIG.

In the case where the counting part and the comparing control part are digital, the counting circuit is formed as shown in FIG.

3. In these circuits, the final signal is the FXR = = T torque control signal.

Fig. 3 shows a hybrid embodiment of the device of Fig. 1. Analog signals of the setpoint Fo of stroke and the setpoints of proportional change of β-stroke are applied to the inputs of the A / D converters 200, 201 in the digital control system 300. 251. If the signals Fo and β are in digital form, they can be loaded directly into multiplexer 251. The Miltiplexer 251 is coupled to an operating unit 252 which is coupled to a memory 254. The multiplexer 251 is further coupled to a digital analog converter 202, the output of which is according to the circuit of FIG. 1, an amplifier 12 and a torque controller are connected with the winding shaft 14 being connected _; substantially similarly as in the previous embodiments, provided with a sensor 15 the radius of which is output to him к ltiip 1 ex 251 _л interruption when p oj middle ctvím en analog to digital converter 202. The digital control system 300 may further include a control circuit 253 coupled to the operational unit 252 and a memory 254. The control circuit of the control circuit 253 is coupled to the output of an external control unit 255, to whose input 256 a control signal with a waveform is shown. The digital values of the traction signal F and the torque signal T can be taken directly from the multiplexer 251, and in analog form these signals F, T can be taken from the digital-to-analog converter 002.

In the analog counting circuit shown in Fig. Z, the signal transmitted from the counting part A represents the tensile force F at any winding radius R and the signal sent from the counting part V represents the torque T under the same conditions. It has been experimentally verified that the tensile stress value F and the torque T proceed according to the characteristics in dependence on the winding radius R shown in Figures 6A and 5.

The characteristics shown in. Fig. 6A corresponds to the case where in the theoretical delta equals 1, the beta coefficient is a parameter and the winding radius R is variable and the winding voltage F is so controlled that it decreases gradually linearly. The characteristics in Fig. 6B correspond to the case where the delta = 1/2, and the character of the isle on eb. 6C if delta, '= = 2. .

An example of the analog operating circuit shown in FIG. Fig. 2, a comparison of the control of the preset torque T and the actual torque T bude will be explained. In the example, the amplifier output signal is used as a feedback signal. This method is not desirable because it is not processed as a value of the actual torque. This circumstance can be overcome by sensing the value of the actual torque exerted by the drive strike, the electrical signal converter, and the feedback of the sensed signal, which lies outside the scope of the invention.

Fig. 7 shows a side view of a winding device on which it is applied according to the invention. The device works in conjunction with the center shaft drive and the friction drive. A shaft 20 is provided on the support 18, on which a rocker arm 19 is mounted at one end. On the side of the shaft 20 a sensor 21 is provided for detecting the angle of deflection of the arm 19. The winding shaft 23 is mounted at the upper end of the rocker arm 19. In the central part of the frame 19, the actuator 24 of the twisting mOmetalt is provided.

Between the winding shaft 23 and the torque actuator 24 there is a first transmission 25, for example a V-belt, and between the torque actuator 24 and the shaft 20 there is a second transmission 26 and further between the shaft 20 and the sensor 21 is a third transmission 27 , chained.

FIG. 7 shows the winding of the web 30 on the web. The reel 30 is wound into the coil 31 by friction drive by the touch roller 28 and the torque exerted on the evil winding shaft 23 by its control by a torque controller 24. The rocker arm 19 pivots on the shaft 20 as the winding radius of the coil 31 grows and maintains the pressure contact between it and the contact roller 28 as a constant light pressure by the pneumatic roller 22 (a hydraulic roller can also be provided).

The contact roller 28 smoothly guides the web 30 to a position just in front of the roll 31 and prevents air from entering it. The shaft 20 is the drive shaft and transmits the driving force by the second transmission 26 to the input of the torque mbment actuator 24. The increase in the winding radius compensates for the angular swing of the arm 19. The measured value signal corresponding to the increase in the radius is produced by coupling the arm 19 to an electrical signal converter or detector 21 which is a sensor, for example a very accurate potentiometer for processing very weak signals of third transmission 27. it is very fine and has a constant precise transmission ratio.

It is preferred that the torque controller 24 has a characteristic of the relationship between the control signal and the output torque directly or at least approximately directly dependent.

In the present invention, power is transmitted by a magnetic clutch powder. In addition, the power of the brushless AC or DC motor (not shown) can be directly controlled.

As already explained, FIG. 1 is a diagram of a control system based on the determined value of the winding radius.

Depending on the control system, only when the winding radius signal R is used, the values of the winding radius of the coil obtained produce a control signal, the difference between the tensile stress previously applied to the adjusting unit and stored in the comparison control unit.

The control signal is amplified by the amplifier into the power signal required to operate the torque controller 24. The torque control by the actuator 24 is caused by an electric force signal and a shaft drive · -23. ' Giant. 8-10 illustrate ^one coiling of cut strip in which the winding · Cr-OU · angular momentum is transferred by a common shaft.

Giant. 8 is a side view and FIG. 9 is a plan view of the device. The strip 30 fed from the unwinding device (not shown) is guided by the guide roller 43 to the expansion roller 44 for smoothing and straightening the folds. The belt is further guided through the contact roller 45 to the groove drum 46 and the strap cutter 47 and continuously. being cut into strips 41, 42 of a predetermined width.

The slit strips are wound onto coils 51, 52, 53, 54 which are contacted by the tactile roller 48, 49. The coils 51, 52, 53, 54 are wound up by shafts 59, 60, 61, 62 arranged transversely between the front ends of the rockers arms 57a, 57b, 58a, 58b mounted rotatably on the support shafts 55, 56 and continuously increasing the winding radii. In the exemplary embodiment, this means that the coil 51 is supported by the winding shaft 59 and the swinging arms 57a, 57b on both sides.

The other coils 52, 53, 54 are carried the same. In the embodiment where the narrower strip has a very small width, as in the case of the coil 52, for example, an arrangement can be chosen in which the winding shaft 61 is disposed in a single arm 76.

The contact rollers 48, 49 and the respective coils 51 are held in a measured contact control of the thrust forces exerted independently on the respective rocker arms 57a, etc. A corresponding design between the rocker arms 57a and 1a. and winding shafts 59 etc. is shown by way of example in FIG. 10.

The winding shaft 59 '(FIG. 10) of the winding coil 53 is supported at both ends in the rocker arms 57a, 57b. At the side of the arm 57a are provided torque control means pirio and means for detecting the winding radius. The support shaft 55 of the swing arms 57a, 57b is also driven by the shaft with the necessary torque. A central transmission ring 64 is mounted on the support shaft 55 on the po21620 3 spoke 63. At one end of the front ring 64 a torque transmission 66 is provided to the input side of the torque actuator 65. The swing arm 57a rotates freely on the bearings 67 on the outer periphery of the central transmission ring 64 carried on the frame 68. The swing arm 57a can follow the increase in the winding radius of the coil 53. The torque controlled by the torque controller 65 is applied to the winding shaft 59 by a belt drive 69. The sensor for detecting the winding measure of the lamp 53 is so arranged that the angular swing of the rocker arm 57a is transmitted by coupling means, for example a chain transmission 70, very fine and with a very precise transmission ratio, to an electrical signal converter 71, for example. potentiometir.

The swing arm 57b MIA similar construction to the swinging arm 57a and ^not: the free end of the other end a freely rotating winding shaft 59, in addition to means for controlling the torque and the detection coil winding radius * 53rd

In operation, a constant value torque is first fed from the support shaft 55, which is simultaneously the drive shaft, to the intermediate gear ring 64 and is further guided by the transmission 66 to the input side of the torque actuator 65.

Further, the winding radius signal is detected by the electrical signal converter 71, the following comparison of the tensile voltage therewith generating a signal for controlling the torque controller 65 which is thus controlled. Thereafter, a torque is generated at the output side of the actuator and is guided by a gear 69 to the winding shaft 59. As a result, the winding coil 53 of the narrower strip 41 is wound at a suitable torque at a suitable tensile stress. The arms 73, 74 (FIG. 9) do not follow the shaft 62 of the wider belt roll 54.

As already mentioned, the tensile stress is electronically controlled by two values, the tensile stress value and its gradient value.

In addition, tensile stress and torque can be determined directly and voltage can be controlled by simply adjusting the dial. As a result, good operating characteristics are achieved and constant voltage control is very accurate and easy.

FIG. 9 shows a case in which a wide strip is cut into several narrower stripes. Under these conditions, an independent control of the tensile stress system příslušných of the respective rollers can be provided according to the invention. However, this leads to an increase in equipment and hence to costs with an increase in the number of actuated rollers, and maintenance becomes more difficult. In such a case, it is advisable to use multiple control systems commonly used by the individual cylinders. Such a system can be relatively easily formed using known electroinical circuits, using an analog or digital method.

Giant. 11 shows a side view of a device to which the present invention is applied and a winder with a belt cutter, with special drives. A shaft 80 is provided on the fixed slide 78 to receive one end of the rocker arm 79. The tilt shaft 80 is a sensor 81 for detecting the swinging angle of the rocker arm 79. Between the rocker arm 79 and the slide 78 a winding shaft is mounted at the rear. 83. A torque actuator 84 is mounted on the front of the supoirite 78. For example, a belt drive 87 is provided between the take-up shaft 83 and the intermediate shafts 85 and between the intermediate shaft 85 and the drive shaft 80 there is a belt drive 87. Another belt second gear 89 is between the shafts 88 of the torque control 84 and the drive shaft 80. 92 is then provided between the shaft 88 of the actuator 84 and the shaft 91 of the electric motor 90, and finally the drive shaft 80 is connected to the sensor 81 by a chain fourth gear 93.

After cutting the strip 30 (FIG. 11), each of its parts is wound by a take-up shaft 83 into the coil 94 by a contact roller 95.

As shown, the device is arranged symmetrically with respect to the touch roller 95, and like parts have the same reference numerals.

The left part of the machine, indicated by solid lines (Fig. 11), indicates the position at the beginning of the winding, the part indicated by the dotted line at the end of the winding.

The continuously supplied belt 30 is guided through the guide roller 96. After aligning the folds on the expansion roller 97, it is cut into narrower belts of a predetermined width on the groove drum 98 with the slitted belt 99.

The slit strips are brought into contact with the contact roller 95 via the supply roller 100 and are distributed to the individual reels of the winding shafts and contact the front and rear sides of the contact roller 95.

The expanding roller 97, the groove drum 98, the feed roller 100 and the touch roller 95 are movably coupled and driven by a control electric motor (not shown). Each winding shaft 83 is driven separately by the electric motor 90 and the gears 92, 87, 89, 86. Because the belt 30, due to the guiding of the groove drum 98, is behind the expansion by the cylinder. 97 in the S-shape, a considerable friction force is generated. This compensates for the unevenness of the feed of the guide roller 96 and detects the continuous winding. A pneumatic hydraulic cylinder 82 is provided to create a suitable constant light pressure between the tactile roller 95 and each coil 94. The influence of surface frictional drive by contact of the tactile roller 95 with coils 54 can be mitigated to enhance the drive of the intermediate winding shafts 83.

The winding radius is determined so that the angular swing of the rocker arm 79 is transmitted to the transducer 81, which is a trick-wave transducer, for example a potentiometer, by a chain fourth gear 93. The signal from the transducer 81 is returned to the comparison control unit 11 as shown Giant. 1. The control signal generated by the comparator control unit 11 is applied to a torque controller 84 (FIG. 11). In the operation of the present invention, it is necessary to consider the delimitation of mechanical losses and inertia due to the design of the device. Conventional means adapted to the normal operating conditions of the device may be used to remove them.

Claims (2)

A method of controlling tensile stress when winding strips of material onto coils, wherein the coil winding radius is continuously sensed and the coil driving torque is controlled according to its radius, characterized in that the value of the tensile force is calculated in the computer from the value of the sensed signal corresponding to the sensed radius of the coiled winding according to a predetermined equation, the calculated value is multiplied by the value of the sensed radius signal, whereupon the driving torque of the coil is adjusted according to the value of the obtained product. 2. Apparatus for carrying out the method according to claim 1, comprising a winding spindle and its drive and an instantaneous winding radius sensor of a coil, the winding shaft of which is arranged at the free end of the rocker arm in contact with the counterspindle and a group of rollers for feeding the material; an electric sensor (81) for changing the angular position of the rocker arm (79) is provided on the support (78), the winding shaft (83) is driven via a gear (86) and a belt first gear (87), a belt second gear ( 89) and a third belt transmission (92) from the electric motor (90), the sensor (81) being driven by a chain fourth transmission (93) from the belt first transmission (87) and its output coupled to the input of the comparator control unit (Ί1), the output of which is connected to a torque controller (84).