DE1952829C3 - Density control for the bevel material in a feed chute for feeding a card - Google Patents

Description

The invention is based on the object of a

The invention relates to a density control for density control for the fiber material in a filling the fiber material in a filling chute for feeding a 5 ° chute for feeding a card so to design card with a feed device for the chute that a uniform density or thickness of the fiber and with at least a movable shaft wall, material is guaranteed and occurring sealing with form rollers for leading out the fiber material, differences in thickness can be continuously and easily greased out of the shaft and for shaping the fiber material as quickly as possible,
bahn, with a measuring device for determining the 55. This object is achieved according to the invention by the mean density of the fiber material and a drive, that the filling chute is connected to a stopper and a motor that, according to the measuring device, this stopper from a motor with changeable! given signals is controllable. Speed can be driven that as a measuring device

In the manufacture of such fiber material webs to measure the average fiber material density inside Fiber fleece machines is the maintenance of a βο a container connected to the shaft one uniform fiber fleece thickness or density is to be aimed at- light source is arranged on one side of the container practice or ensure. and that on the other side of the container, the light

It is known to have the feed chute for the fiber source opposite one another, a number of each other well-known fotoelek arranged well on one side with a movable side wall tu provided, which are provided by a motor an * 65 tric cells which the de driven vibrating roller is moved, with one of the light source emitted light intercept and rush Density influencing device controls the engine electrical signal, which is an overall result de and thereby a corresponding shaking movement on photoelectric cells, generate the zu

Maintaining a substantially uniform 40 passing through an inlet 44 of a second container In order to achieve a tight seal at the container inlet, feed the drebzahlver- 46. The rollers 40 cram the fibers in changeable drive motor that controls the tamper. the container 46. With the help of a pair of fiber fleece

The advantages achieved by the invention consist of forming rollers 48, fibers from an outlet 50 in particular that the pulled out at the end of the filling 5 of the container 46 and the carding shaft horizontal forming rollers have already been fed to a same-feed rollers 18. The fiber fleece Pre-compacted and distributed fiber material roll and the feed rollers 18 are fed syn which is driven at once and in a continuous and similar manner, so that with connual ones Process brought into its final form Stanthalthalt the fiber thickness at the outlet 50 of the Bewerden can, with a uniformly high through-io holder 46, a constant amount of fiber from the Set speed and increase in the FHeßquaütät fiber fleece forming rollers 48 is promoted, which leads to the Ersowie a particularly high uniformity and generation of a uniform fiber fleece. Density of the fiber fleece. As a result, dimensional and strength tolerances can be adhered to in order to maintain a uniform fiber tightness. Devices are provided in the container 46, so that the textile industry has one for those who control the rotation of the darning rollers 40, Fast mass production very useful raw material As shown in FIGS. 2 and 3 can be seen, is a Drehlerial, namely, the fabricated nonwoven fabric is present. variable number drive motor 51 as a drive with

An exemplary embodiment of the invention is connected to one of the S'.opf rollers, which in turn is represented by the drawing and is described below with a toothed gear ST .. having the same module as the other. It shows 20 darning roller connected so that the darning rollers 40

F i g. 1 is a side view of a nonwoven fabric being driven synchronously and in opposite directions, as it is Machine on which the invention is applied, the arrows 55 in FIG. 2 show.

F i g. 2 shows an enlarged schematic illustration. The speed of the motor is dependent on

of the invention, on the average density of the fibers in the container 46

F i g. 3 one in the direction of arrow 3 in F i g. 2 controlled 35. F i g. 2 shows one side of the container rear partial view of the drive of the ters 46 a dust-free housing 56 and a dust pusher, Case 58 on the other side. A number

F i g. 4 is a schematic diagram of the electro-photoelectric cells 54 shown in the housing 56 view of the control circuitry of the invention. ordered to be from a light source 60 in the housing In F i g. 1 is to collect the generally designated 10 30 58 emitted light. The parts of the fiber fleece forming machine in connection with an all-housing 56 and 58, the carding machine designated 12 adjacent to the container 46, consist of transparent or translucent. The material 62 produced by the fiber fleece forming machine, such as glass or the like, produced fiber fleece is fed to the card or card by the circuit for speed control of the card feed roller 18. The drive motor 51 is shown in FIG. The AnKrempel produces a fiber fleece W in the usual way, the drive motor lies between two current-carrying cables on this with the help of a conventional winder 64 and 66. Whether the drive motor is controlled by a silicon like the card a possible use of the rectifier, which shows in the conductive state fiber fleece, the invention is in no way γ * the drive motor, the positive half of the oscillation is limited to a specific use, each electrical impulse supplies. An ignition circuit because the fiber fleece for feeding a needle felt machine 70 works synchronously with the rectifier 08 and can serve as a machine or any other machine to control the ignition angle of the rectifier 68 in the position of non-woven textiles. Way that those during the positive half-speed fiber web forming machines are commonly 43 longer or shorter in order to supply more or less current to the motor as direct cards, shaft cards, drivers, mixers. This part is known etc. the motor control is standardized and in general As shown in Fig. 1 and 2, with the help of Electric Manual GEK-4660 from May 1967 in more detail a conveyor 28 digested fiber material is written.

conveyed from a first container 30. The first 50. The normal Motoi control circuit contains except containers the fibers from a potentiometer 72, generally controlled by a hand, 32 designated storage facility supplied. The fibers that provide tensile stress. This reference is made by a stripping roller 33 from the conveying voltage is more accurate for a given engine speed removed and spaced in a filling chute 34. During the negative half oscillation, at threw. The conveyor 28 conveys a fiber over 55 which the rectifier 68 is not permeable, creates shot, so that the hopper 34 is always filled, the DC motor an electromotive force while the remaining fiber excess through (EMF), which changes with the Motofdxehzahl. Of the blown a return chute 35 to the first container * ignition circuit compares the difference between sen wid to again conveyed by the conveyor 28 the emf and the reference voltage and receives it to become. 60 by changing the ignition angle of the rectifier

The filling chute 34 contains a fixed plate 36 and 68 substantially constant. The engine speed falls vibrating plate 38, which for the downward movement from below a certain speed, so sinks generation of the fibers and the EMF generated to a uniform width distribution, which leads to an increase in the ment of the fiber material in the machine is used and the difference between the reference voltage and the In addition, the nonwoven fabric forming machine 10 is caused a far 65 EMF. The ignition circuit 70 responds to feeds uniform divides on the way. this difference by calculating the ignition angle of the

As can be seen in particular from Figure 2, contains rectifier 68 brought forward so that this during the fiber fleece forming machine 10 a pair of tamping rollers each half oscillation remains permeable longer, where-

5 6 y

if more current is supplied by the armature and to measure density in the container 46, this is done by the the engine speed increases. If the signal emitted by the motor speed cell is above the predetermined speed due to the signal generated by the hand pick, then the activated speed control 72 increases the generated EMF signal, as a result of which the torque decreases. When the density of the between the light source difference between the reference voltage and the fiber material ab-EMF passing through the cells. To this decrease in the increase, the stronger incidence of light causes a greater difference. The ignition circuit 70 reacts by delaying the current output of the cells. This enlarged Increase the ignition angle of the rectifier 68, so the current output increases the difference between the that this short-term cell signal and the EMF with every half oscillation. The ignition circuit reacts is permeable, which means that the armature has less current to this difference by moving the armature forward receives and the engine speed drops. The reference ignition angle of the rectifier 68, which increases the motor voltage in the potentiometer can be changed by hand. The increased engine speed causes to set the speed as required. a faster rotation of the tamping rollers, where-

In contrast to the normal circuit for the Mo- through more material between the light source and

^ speed control with which the motor speed ts is passed through the cells,

can be kept constant, is the one shown in FIG. 4 due to an increased material density between the

set control circuit for the motor speed in the light source and the photocells, the current

has been modified in such a way that the turning ability of the cells is diminished. The degradation of the

The number of the motor can be changed automatically to deliver a current of the cells reduces the difference

Maintain a specified density of the material. ao between the cell signal and the emf. Demented

In the modified circuit of the invention, speaking, the ignition circuit delays the ignition angle

two signals are still included, which the ignition circuit of the rectifier 68, which decreases the mo-

are fed. One of the signals is the EMF, which results in door speed. This will make the

while the other of the photoelectric cells stuffs, it turns around more slowly and it gets less

54 is generated. The photocell signal is amplified as the fiber material between the light source and the cell

and takes the place of those mentioned above, brought by hand.

set reference voltage. It is important that the cells are excited by the light which is held by the light source for the mean fiber density within Starting from 70, radiation passes through the bell container 46. The cutting through the entire width of the photocell container causes a signal which is characteristic of 30 years 46. This is why is amplified by an amplifier circuit 74. When there are a number of cells that are larger than the Cells 54 are photocells with the outer width of the container are distributed so that photoelectric effect, which when excited by each of the cells emit light from the light source 60 emp-light energy a small current. It can begin, which passes through another section of the Resistance cells can also be used when the container 46 has passed through. If you step between each other, the resistance changes depending on the light falling below the density of the two ends of the container. Let the latter be explored, so the cells are differentiated It is a separate energy source, but both are excited to a certain extent Construction types produce one proportional to the light intensity are integrated into a single display, so cflß tional small stream. 40 the resulting signal is therefore an image of the

The in F i g. The circuit shown in FIG. 4 may show medium fiber density across the container 46. Operated manually or automatically. With the help of the light source 60 can be from a number of a double pole in the form of a double switch 75, lamps, one for each photocell, ocer off which has two switch hubs 76 and 77, which can consist of a fluorescent light source Circuit can then be operated by hand when 45 is over the entire translucent surface 62 of the arms 76 and 77 in the form shown in FIG. 4 emits a homogeneous light in the pulled-out housing 58. If the position shown is in a dashed line. If desired, the intensity of the light source can be adjusted with Circuit is closed in this way, the machine can use a conventional intensity control loop operated by hand, the engine speed must be changed, denoted by 80 in Fig. 4 change until the desired density of the fiber is 50. The light intensity can therefore depend on fleece is achieved. For this motor speed, the type of fiber used or the dei associated, manually controlled reference in density of the nonwoven fabric produced is increased or a combination of matching circuit 78 is entered. Which are diminished by.

The reference voltage obtained from the photocells 54 is The amplified signal is also sent to the matching circuit by means of a sensitivity control circuit 83, which is used to differentiate between these reference voltages displayed on a voltmeter which can be adjusted on the fore-fresh signal. The switching side of a switchboard is arranged. The value of the circle S3 controls the speed with which the Ma . Cell signal is changed until it is exactly de gates speed depending on changes enlarged or reduced with the reference signal entered by hand over the photoelectric signal agrees so that the voltmeter becomes a difference of. Anyone who does not suffer from sensitivity can do it If the signals are used in this way, NnII volts will indicate a two hand operated circuit have been adjusted, the switch socket 76 can contain potentiometers, mn the charging mw and 77 of the switch 75 to be in the discharge speed of a capacitor in dashed lines in FIG brought the position shown, whereby the circuit 65 correct, is switched to automatic. The electrical control device described;

When the circuit in FIG. 4 to automatic - offers a high degree of adaptability, so dal

Has been put to the changes in fiber- they cover a wide range of fiber and fiber

Animal conditions are unique. It is indispensable that even very low engine speeds can be brought about within a very short period of time. The silicon

In this way sixty rectifiers are fed to the motor, each of which is influenced by the intensity of the cell signal. Any change in fiber density measured above el · 46 immediately affects the engine speed.

1 sheet of drawings

Claims (3)

ι 2 VJ the movable side wall to determine the Dott ... Density of the fiber material transfers (British patent claims: tentschrift 930234). With this design, however, a sufficient and even prediction 1. Density control for the fiber material in a 5 seal of the fiber material is not achieved, since the fixed FuHschacbt for feeding a card with a position of the fiber density by purely mechanical MU-Liefervorricbtung for the shaft and with min- takes place, which is only very imprecise and with a considerable amount of at least one movable shaft wall, with a delay, a constant regulation of the density of the forming rollers to lead out the fiber material can be carried out, from the shaft and for shaping the fiber to In another known, the density gutbahn, with a measuring device zurrt determination or thickness of a fiber fleece measuring device men the average density of the fiber material and the finished fiber fleece between rollers is a drive motor that according to the supplied from the measuring table and smoothed on this, the signals given to the measuring device then being controllable, a measurement of the density or thickness of the, characterized in that the fiber fleece is connected downstream by means of a photoelectric Einrich-FüIIschacht (34) and this device connects (U.S. Patent 2,466,615). Here the tamper can be driven by a motor (51) with variable speed when there is no pre-compression of the fiber material, that as a measuring device or even a density control takes place, but by means of measuring the average fiber material density in the corresponding control of the feed speed inside one of the shaft (34 ) connected 20 of the already ferti-container (46) running through the rollers, a light source (60) on a layer of fiber material, either a thinner or holder jite is arranged and that on the other - a thicker fiber fleece is produced, which because of the ren On the side of the container, opposite the light source (60) due to the variable roller speeds, a number of different ordered, well-known photoelectric tensile stresses caused by the non-woven fabric, a uniformity in the density of cells (54) are provided, which the or thickness may not always have.
Light source to collect light emitted and an electrical signal in front of the nonwoven forming rollers, which represents an overall result of the ordered photoelectric measuring device on the photoelectric cells, to generate the feed shaft of the fiber material known (French that for maintaining an essentially 30 patent specification 972 692). In this design, there is a uniform density at the BehiUierauslaß (50) which the signals coming from the photocells transmit to the variable-speed drive motor (51) of the forming rollers, whereby this one controls the tamper. always the corresponding one in the feed chute 2. Device according to claim 1, characterized in that the speed of the fiber material is changed indicates that the photoelectric cells 35 can. With this measure, however, that and the light source in translucent, dusty fiber material is insufficiently uniform Housings (56, 58) are housed. Much density can be kept because of the high 3. Device according to claim 1, characterized ge circumferential forces of the rollers time delays indicates that the tampers roll open in the form of tamping between signal occurrence and signal execution (40) are formed. 40 th, which result because on the one hand for the Deceleration and acceleration of the rollers require a lot of effort and, on the other hand, a certain amount Time is needed. The speed of the Roller can never exactly match the conditions 45 can be adjusted in the feed chute so that a uniform density of the fiber material between the rollers is to be maintained.