CN1993506B - Device and method on a carding machine - Google Patents

Abstract

The invention provides a device and a method by which the air flow and fiber flow at the rollers (6, 8) can be adapted to the operating conditions by controlled positioning of an air guide element (22). This is performed by a device according to the preamble, wherein the air guide element (22) has at least one reference point and is moved along a straight line at a distance from the surface of the rollers (6, 8) and extending substantially along this surface, and by a corresponding method.

Description

Device and method on a carding machine

technical field

The invention relates to a device for adjusting the air and fiber flow distribution at the transfer point from the card cylinder to the doffer by means of the arrangement of at least one air guiding element, wherein after installation the air guiding element is arranged in conjunction with at least one High-speed rollers, ie card cylinders and/or doffers opposite, form a working gap between the air-guiding elements and the rollers, and relate to a method for configuring the air-guiding elements according to the preamble of claim 12 .

Background technique

The present invention relates to the regulation of air and fiber flow on cards. The functions of the card include separation of the fiber stream into individual fibers, removal of foreign matter, dust and short fibers, separation of neps, improvement of fiber mixing, fiber orientation and sliver formation. For this purpose, the fibrous material is primarily treated on card cylinders, often also called card cylinders.

Downstream of the card cylinder is the doffer, whose function is to pick up the individual fibers from the card cylinder and compress them to form a web.

The transfer from the card cylinder to the doffer is a very sensitive area. Once the material has been transferred to the doffer, the carding process in the strict sense is over and the cotton web can only be formed into a sliver.

At the transfer point from the card cylinder to the doffer, the fibrous material with a parallel orientation on the card cylinders is brought again to a random position required for the noil and the fiber ends are kinked. The transfer point must be adjusted in such a way that the material quality is not unduly impaired by the above-mentioned treatment.

Furthermore, the transfer point between the card cylinder and the doffer determines the carding quality to a considerable extent, since this depends on the percentage of fiber material transferred from the card cylinder to the doffer, and thus influences or determines the fiber transfer coefficient.

The tendency of the fibers to cling to the roller clothing or to loosen at the transfer point is partly influenced by the airflow around the rollers.

In DE10110824 is shown a possibility to check the airflow around the card cylinder. This document discloses a cylinder outer surface with air delivery openings. Its supply and discharge of additional air can be adjusted via pivotable air guide elements. However, this method does not allow direct influence on the sensitive area between the card cylinder and the doffer or doffer roller.

It is known from the prior art that the distribution of the air and fiber flow at the transfer point between cylinder and doffer can be influenced by air guide elements, also referred to below as guide elements or guide tongues. Such elements are known, for example, from EP984088A2, especially in different mounting forms. The distance between guide element and roller can be selected, but then fixed.

The guide elements influence the air flow through the rollers. This in turn affects the tendency of the fibrous material on the rollers to tend to attach to or detach from the rollers. EP984088A2 shows that the shape of the air guiding element is characterized by the flow path of the airflow, a laminar flow pattern being preferred.

The setting or adjustment of the guide elements is performed before the material is supplied to the carding machine. The fitter checks with the material to be processed how much volume of fiber is transferred to the doffer and what is the quality of the web produced from the noiled fiber.

Specifically, the fitter checks whether the noil web is tight, whether it has holes or thin or thick spots, whether there is unevenness, and how wooly the web is.

The fitter adjusts by manually setting the distance between the guide tongue and the roller and the angle of the guide tongue until he is satisfied with the quality of the web. An adjustment device used for this purpose is described in EP-B-790338. In the last step described, an adjustment device should be inserted through the side wall of the cylinder in such a way that it is detachable from the outside of the side wall.

However, it should also be taken into account that the air guiding elements extend over the entire working width of the card and must be arranged as wide as possible in width. Therefore, two adjustment devices must be provided on the side walls of each cylinder. However, it is impossible for the fitter to operate two such adjustment devices simultaneously.

Furthermore, since the rollers operate with different fiber materials and different operating parameters, such as roller speed, throughput, etc., it is desirable that the airflow can be selectively controlled or adjusted.

The object of the invention is to provide a device in which the air and fiber flow at the rollers can be optimally adapted to the operating conditions by arranging an air guiding element.

Contents of the invention

In a first aspect, this object is achieved by a device according to the preamble, wherein the air guiding element has at least one reference point, which can be along a straight line extending at a distance from the surface of the roller and substantially along this surface Movement is also achieved by a method according to claim 12 .

In a second aspect, the object is achieved by an adjustment device which is suitable for adjusting the air guide element over its entire width and which can be driven from a predetermined adjustment position. The machine operator preferably has easy access to this adjustment position.

In a third aspect, the object is achieved by a guide for the air guiding element, which allows adjustment of the element in the circumferential direction of the roller, in particular of the card cylinder.

A key aspect of the invention is that the air guiding element can move around the rollers.

The air guiding element according to the invention is applied at the transfer point at which the fiber material is transferred from one roller to the next, ie from the card cylinder to the doffer. Viewed from one side, one roller rotates clockwise and the other counterclockwise, whereby at the point at which they are closest to each other both rollers move in the same direction. The air guiding elements are arranged in regions in which the roller surfaces move away from each other.

For example, it is possible for the guide elements to be mounted on the card cylinder and the doffer, or to provide only one air guide element, which has such a shape that the air flow around the two rollers through it is influenced. It is also sufficient to arrange the guide element on only one roller.

The inventive arrangement of the air guiding elements allows to move the air guiding elements closer to the area where the two rollers are closest to each other, or to move the air guiding elements further away from this area.

It should be ensured that a defined volume of fibrous material is transferred from one roller to the other in the transfer zone. Depending on the prevailing combination of a large number of operating parameters, the material tends more or less to remain on the card cylinder, or to leave the card cylinder and transfer to the doffer. Examples of such parameters are fiber type, fiber length, throughput, roller speed and climate, in particular temperature and/or humidity.

The card cylinder running at very high speeds forms an air cushion around the card clothing which is wrapped onto the card cylinder, which forms together with the rollers. In the transfer area downstream of the first point between the card cylinder and the doffer, this can generate a wake in the direction of the card cylinder which can hold more fiber material than desired on the card cylinder.

The risk of hole formation is especially great for relatively low sliver weights (eg 2-8 ktex, especially 4-6 ktex) and therefore relatively thin webs.

On the other hand, material deposits can form on the edges of the air guiding elements, which deposit at irregular intervals on the card cylinder or on the doffer. In the latter case, holes or undesirably thick spots can also form on the noil web. This occurs when there are large fluctuations in production. Examples of such fluctuations are:

a) when changing from a lower production rate (eg about 40 kg/h) to a higher production rate (eg > 150 kg/h), or

b) During spinning when accelerating from slow speed (eg about 5 kg/h) to normal production rate (eg >80 kg/h).

Transfer rate and smooth running (no web problems) are also dependent on fiber length. For example, if the distance between the air-guiding element and the closest point between the card cylinder and the doffer is too large, a volume is formed in the nip, that is, in the area where the card cylinder and doffer start to move apart, in which Short fibers will move back and forth uncontrollably. On the other hand, if the distance is too small, the longer fibers will collect on the edge facing the guide tongue entering the jaws.

The optimum conditions must be determined for each case. In order that the machine does not have to be completely refitted every time the operation is changed, it would be advantageous if the air guiding element could move within a given range, preferably one closer or further away from the nip between the card cylinder and the doffer Movement of the closest point of the mouth.

In the case of a card cylinder, the dimension of the working gap formed between the air guiding element and the roller surface on which the clothing is arranged lies in the range of millimeters or tenths of a millimeter. For this purpose, at least partial regions of the air guiding element are held in a fixed position in prior art solutions. After loose mounting, the air guiding element can thus be adjusted manually, but is otherwise fixed in a fixed position on the card frame. Compared to the working width of the cylinder in the meter range, only very small changes in the element position are of course possible.

In a preferred embodiment of the invention, the entire air guiding element is movable. Precise guidance of the element is still possible, eg because a straight line is provided on which at least one reference point of the guiding element is guided.

The reference point can be an axis running through the entire air-guiding element over the full working width, a point symmetrical to each other at the ends of the air-guiding element, or a point located in an area specially intended for installation or fixing of the air-guiding element. This reference point can also be the center of gravity of the guide element.

The standard line can in particular be formed by a corresponding guide rail or guide groove in which the guide element is held. The guide element can also be guided in a cup-shaped element, so that the standard wire according to the invention is part of the guide surface.

The straight line preferably extends substantially along the surface of the roller, in particular in the circumferential direction, allowing the movement of the guide element around the roller. If this straight line extends perpendicular to the roller surface, a movement along this straight line will only correspond to changing the distance between the guide element and the roller surface.

The guide elements can be fixed only at a few selected points on the standard line or at all points on the standard line, thus enabling infinite variable adjustment.

Depending on the position of the standard line relative to the roller surface, the distance and the angle between the air guiding element and the roller can be changed when the air guiding element is moved along this straight line.

In a preferred embodiment, at least one reference point of the guide element is guided along a straight line coaxial to the roller shaft, whereby the guide element forms a working gap. When the air guiding element is moved, the distance between the roller surface and the air guiding element remains constant.

The inventive positioning of the air guiding element can incorporate possible variations known in the prior art; for example, the distance between the air guiding element and the roller can also be adjusted and/or the air guiding element can have a reference point through which an axis extends. The reference point around which the air guiding element can rotate.

In addition, the outer surface of the rollers may have air transfer openings for the introduction and/or removal of additional air.

The position of the air guiding element may be fixed during installation of the machine; however, in a preferred embodiment, the guiding element is connected to a control device by means of which controlled movement of the air guiding element is possible. The control device can have a dedicated drive, for example a servomotor can be provided which initiates the guiding movement of the guiding element. The machine operator can determine the position of the air guiding element via this control device.

For the control device, it is also possible to make it automatically perform the positioning of the guide element according to a variable parameter setting, which for example represents the weight of the sliver at the outlet of the carding machine or on the can, represents the type characteristics of the raw material and/or represents the position of the rollers. speed characteristics.

In a preferred embodiment, the device is equipped with at least one optical detection element.

This element can be a camera by means of which the position of the guide tongue can be observed even when the machine is switched off. For example, by controlling one or more cameras and displaying the images on a monitor, the fitter can carry out initial adjustments of the air guiding elements which were previously carried out at machine start-up. To this end, it is advantageous to be able to observe not only the guide elements but also the quality of the fiber material held on the card cylinder and/or deposited on the doffer and display it on a display.

Observing the position of the guide element by means of a camera has the advantage that only millimeter-wide distances can be magnified and thus controlled more precisely than adjustment with the naked eye and can help to check redundant distances.

The viewing angle of the camera can be focused on the gap between the card cylinder and the doffer and/or on the gap between the air guide element and the roller. It can also be tangential to the rollers to register hairiness in the fibrous material, or centered on the rollers from the front to detect holes or thick spots in the fibrous material. A camera image of the area between the card cylinder and the doffer can provide information on whether material buildup is forming on the guide tongue.

The images recorded by the camera(s) can be transferred to an evaluation system. For example, this system makes it possible to monitor whether and to what extent the gaps are clogged with raw material, or whether the hairiness of the web exceeds a given reference thickness. If there is too much deviation from a given reference value, an alarm signal can be triggered.

The optics can also be operated with sensors for additional light sources and measure distance, angle or fiber quality.

The monitoring of the optical signal can be used as an operator aid during the initial setup of the machine, or to indicate the need to monitor setup parameters or to make new adjustments.

Signals from web monitoring devices downstream of the cylinder/doffer transfer point can also be used to adjust and/or monitor air-guiding elements, such as cameras monitoring the web in a fleece bridge.

In another advantageous embodiment, the control device is connected to at least one sensor for measured values. This measured value can be a direct or indirect measurement for the instantaneous position of the air guiding element. For example, it can display distances or angles, but can also quantify the pressure of the air draft between the air guiding element and the roller. It is particularly advantageous if the air and/or fiber flow, or the air distribution between the individual rollers, is measured directly. For this purpose, air and/or fiber flow measurements are carried out in the respective flow channels, in other words in the gap between the guide element and the card cylinder and/or in the gap between the guide element and the doffer roller. For comparison, the pressure in the area around the card cylinder can eg be measured before the air cushion reaches the transfer point.

The measured values can be displayed so that the machine operator can reposition the air guiding elements according to the displayed measured values. It is preferable to install a simple device which performs a simple and precise manual adjustment, the scale can then guarantee always the same adjustment and thus simplify the operation of changing the feeding spools.

However, the control device can also carry out a comparison with a predetermined setpoint and output a signal in the event of a deviation, to which the machine operator will respond.

The setpoints can be set by the fitter or taken from a database compiled of optimized parameter settings for the specific situation. For example, the relationship between fiber material type, desired sliver weight, production capacity and adjustment of air guiding elements can be stored in the database.

In a particularly preferred embodiment of the invention, the control device comprises a control loop by means of which the movement of the guidance element can be carried out automatically.

For example, a setpoint can be entered by the operator, on the basis of a signal from the control loop, by means of which setpoint control it is ensured that the measured value produced by the air guiding element always falls within the error range around the setpoint.

Furthermore, the object of the invention is achieved by a method in which the air guiding element is guided around the roller in a controlled manner.

An advantageous method is used for the initial setting of the air-guiding elements, wherein the positioning of the air-guiding elements is performed in a visually controlled manner by images recorded by at least one camera mounted on the device.

In a preferred embodiment, the method is characterized by the following processing steps. A control unit with a measured value verification system is provided on the device. The control device first compares the recorded measured value with a predetermined setpoint value and carries out a repositioning of the air guiding element in the event of a large deviation between the measured value and the setpoint value.

These processing steps can be repeated at settable time intervals, or the monitoring of the measured values and possibly the tracking of the guide element can be carried out continuously.

Description of drawings

Further advantageous configurations can be seen from the following figures, exemplary embodiments and claims.

Figure 1 shows a sketch in section;

Figure 2 shows a schematic diagram of a first exemplary embodiment of a device according to the invention;

Figure 3 shows a schematic diagram of a second exemplary embodiment of a device according to the invention;

Figure 4 shows a schematic diagram of a third exemplary embodiment of the device according to the invention, with the sensors shown;

Figure 5 shows a sketch of possible variations of the concentration configured according to Figure 2;

Figure 6 shows a variant of the arrangement according to Figure 3, illustrating a solution with one controllable actuator;

Figure 7 shows in principle a further development of the embodiment according to Figure 10 of EP-B-984088, which is designed according to the invention;

Figure 7A shows a detail of a first embodiment according to the principle of Figure 7;

Figure 7B shows details of a second embodiment according to the principle of Figure 7;

Figure 7C shows details of a third embodiment according to the principle of Figure 7;

Figure 8 schematically shows a reference system for a solution with controlled actuators, and

Figure 9 schematically shows an operating point for a solution with controlled actuators.

Detailed ways

Figure 1 shows a flat card in operation, for example a Rieter Card C60, with a working width of 1.5 m and a storage box 1 . The figure shows the general processing in the device on which the device according to the invention is preferably applied.

The fiber tufts are transported through a conveying pipe (not shown in the figures) and processed through a multistage air chamber (also not shown) and finally to the storage box 1 of the carding machine. It transfers the fiber tufts as batt to the carding machine. Feed rollers 3 and troughs 2 feed the fiber tufts to licker-in rollers 5 . Licker-in rollers 5 open the fiber tufts and remove part of the dust particles. The last licker-in transfers the fibers to the card cylinder 6, also commonly called card cylinder or drum. The card cylinder 6 runs with the card flat 7 to further parallelize the fibers. The card flats 7 are cleaned by a flat cleaning device (shown schematically in FIG. 1 on the right side of an operating flat card, but without specific reference numerals).

The area between the card cylinder 6 and the card flat 7 is called the "main carding area", while the area on the opposite side with respect to the axis of the main carding area cylinder is called the "second carding area". district".

As the fibers pass through the card cylinder 6 several times in some cases, they are stripped from the card cylinder 6 by doffers 8, also called "short doffers", fed to output rollers 9 and finally as card sliver 10 is placed in cans (not shown in the figures) in the coiler. Additional cleaning or separation points are provided on the card cylinder 6 , for example a carding element 12 or a separating element with a yarn clearer knife 11 . To drain the removed dirt, additional drains are provided downstream of the individual cleaning points. The outlet ducts that are locally assigned to the individual cleaning elements are combined on one side of the card to form a central outlet duct. One embodiment of such a discharge system is described in EP750059 (Rieter).

The closed-loop (open-loop) controlled positioning of the air guiding element 22 according to the invention is preferably provided in the region in which the fiber material enters the region of the second carding zone or is taken up by the doffer 8 .

FIG. 2 shows a schematic view of a device 221 according to a first exemplary embodiment of the invention, which is arranged in the area between the card cylinder 6 and the doffer 8 . The device comprises a first air guiding element 222 which forms the working gap S with the rollers, in this case the card cylinder 6 .

The air guide element 222 has at least one reference point, indicated in the drawing with the reference number 223 , which is movable on a straight line 224 which extends at a distance 225 around a part of the surface 226 of the card cylinder 6 . This straight line 224 preferably lies in a circle coaxial to the card cylinder 6 . In this case, the distance between the reference point 223 and the surface 226 of the card cylinder 6 remains constant.

In the case of a movement of the air guiding element 222 according to the invention, the distance 227 between the air guiding element 222 and the point of closest approach 230, ie the minimum distance between the card cylinder 6 and the doffer, changes.

The positioning of the second air-guiding element 228 , which forms a working gap with a roller, in this case a doffer 8 , can be performed analogously.

EP0984088A2 shows various possibilities for installing air guiding elements. For example, Figures 1 and 2 of EP0984088A2 show an air guiding element designed as a baffle or guide tongue, which is connected by a tail to a bracket which in turn is fixed at its tail end to a frame part. In order to carry out the movement of the partition according to the invention, the support can have a bearing surface opposite its end, which is opposite the roller surface, and on which the air guiding element can slide back and forth. In this case, the bearing surface of the support defines the standard line of the partition.

Another form of mounting is shown in Figures 3-11 of EP0984088A2. The air guiding elements are arranged here on so-called flat segments, which form part of the side walls of the cylinder arranged on both sides of the card. In a preferred embodiment (according to FIGS. 7-10 ), air guiding elements, in this case called guide tongues, are mounted on the arms on each side.

For the positioning of the air guide element according to the invention, the standard line can be determined in the form of an arm on which the guide tongue can be moved back and forth, or in the form of an arm with a fixed guide tongue which performs a movement relative to the side wall of the cylinder.

Figure 3 shows a schematic diagram of a device 321 according to a second exemplary embodiment of the present invention. In this embodiment there is only one air guiding element 322 with a first surface 329 forming a working gap S with the card cylinder 6 and a second surface 330 forming a further working gap S' with the doffer 8.

The air guiding element 322 is movable around the card cylinder 6 along a line 324 and is furthermore pivotably mounted around an axis 331 . Rotation of the air guiding element 322 about the axis 331 allows the width of the working gap S, S' to be varied.

FIG. 4 shows another exemplary embodiment in which the device 421 according to the invention again has only one air guiding element 422 which can be moved along two straight lines relative to the card cylinder 6 and the doffer 8 . In this figure, the two straight lines are each represented by double-headed arrows on element 422 .

Furthermore, Figure 4 shows in general terms where the sensors can be placed. A first sensor 432 monitors the fiber flow on the card cylinder 6 before the fiber reaches the doffer 8 .

Sensor 432 may be an optical sensor, such as a camera, or a measuring device, such as measuring the pressure of air or fiber flow.

Additional sensors 433, 434 may be provided to monitor the flow rate through the working gaps S and S'. This monitoring can also take place optically, in other words by cameras or optical sensors, or by means of acquired air pressure or flow measurements.

A further sensor 435 can be used to monitor whether or to what extent fibrous material is deposited on the edge 436 of the air guiding element 422 . The short fibers can stick there and vibrate back and forth in the gap 437 between the card cylinder 6 and the doffer 8, or the long fibers can accumulate with one end attached to the card cylinder 6 first.

Additional orientations of the sensors are possible. For example, the camera may be oriented tangentially to the roller surfaces to observe fiber hairiness or aimed directly at the working gap S or S', or the camera may be oriented perpendicular to the roller surfaces and provide an image of the fiber material on each roller. A suitable monitoring system for the interior of a card with a mechanical housing is described, for example, in DE-A-10259475. To ensure adequate image quality, it may be necessary to install additional light sources.

Figure 5 shows a copy of Figure 2 with minor changes. According to a first variant, the air guiding element 222A on the cylinder 6 has a "head" at the free end. This head is substantially the same as that provided on the air guiding element according to Figure 1 of EP-A-432430 (or EP-B-790338). The design of this head helps to completely separate the fiber/air flow which follows the cylinder 6 on the one hand and the doffer 8 on the other hand. The position of the second air guide element 228 assigned to the doffer 8 remains unchanged in FIG. 5 compared to FIG. 2 , since this is only a schematic illustration. In practice, however, the mutual positioning of these two elements must be optimized. This is considerably simplified by the adjusting device according to the invention.

According to a second change shown in dashed lines in FIG. 5 , the reference point 223 is moved radially “inwards” with respect to the cylinder 6 . This creates a new line of motion 224A. This is made possible by providing element 222A with a boom 227 extending radially inwards from the elongate body of the element at a point remote from the head outside the working width of the machine. The reference point 223A is now located in this cantilever 227 . The radial distance of the reference point from the pivot axis of the cylinder can therefore be chosen to be smaller or larger than the cylinder radius, or equal to this radius. The line of motion 224A also need not be circular or chosen to be concentric with the pivot axis of the cylinder. Proper choice of the geometry of this line allows for radial adjustment of the actuator 222A while simultaneously actuating this element's adjustment in the cylinder's circumferential direction.

Figures 6 and 7 each show schematically and on a larger scale than the other Figures a variant of an adjustment device suitable for use with the invention. The solution according to FIG. 6 includes a controllable actuator. In FIG. 6 , the cylinder is indicated by reference numeral 6 , the doffer is indicated by reference numeral 8 , and the closest point between these rollers is indicated by reference numeral 230 . The air guiding element is indicated by reference numeral 322A (cf. Fig. 3) and basically comprises a profile extending across the entire working width (1-1.5 meters) of the card. This profile is connected by rods 350 (only one shown) to a transverse-element 352 by means of a pivot axis 331A (compare FIG. 3 ). Transverse-element 352 has openings for guide rods 354 (only one rod 354 shown) secured to frame 355 by brackets 356 . A bracket also carries a motor 357 that turns a screw 358 that interacts with a nut or threaded hole 359 in the transverse-element 352 .

As the lead screw 358 is rotated by the electrode 357, the transverse-element 352 moves along the rod 354, changing the distance between the "nose" 360 of the profile 322A and the point of closest approach 230. However, the profile 322A can also be rotated about the pivot axis 331A in order thereby to adjust the distance between the cylinder 6 and the surface of the profile 322A facing the cylinder. For this purpose, the transverse element has, for example, a disc 362 connected to a shaft 364 . Axis 364 is the axis of electrode 366 supported by transverse-element 352 . Contour 322A is located on the curved outer surface of a disc connected eccentrically to the motor pivot shaft. Rotation of the shaft 364 thus changes the distance between the transverse-element 352 and the outer surface of the profile 322A that contacts the disc 362 . In order to be able to carry out controlled movements, the actuator can comprise, for example, a stepper motor or an electric motor with an encoder or a resolver.

The implementation according to FIG. 6 is necessarily complex and expensive, and is therefore not suitable for low-cost designs. The solution according to Fig. 7 is much simpler. This is basically a further development of the embodiment according to Fig. 10 of EP-B-984088. The air guiding element 222B (compare Fig. 2) - called "guide tongue" in EP-B-790338 - has a continuous cast profile. This profile is attached to the underside of the arm 112 by suitable means - described in detail below. The outer surface of the cylinder wire (not shown) is indicated by dashed lines and is indicated by reference 1A. A gap E remains free between the outer surface 1A and the element 222B and its opposite surface.

Arm 112 forms what is commonly referred to as a cover segment 125 which is mounted in the frame by bolts 126 . As explained in detail in EP-B-984088, due to the preload, the arm 112 attempts to move outwards in the direction of the outer surface 1A, and is thus limited by a stop formed by the tip of the adjustment screw 132, and thus The width of the gap E is effectively determined. The machine operator can reach this screw 132 from the outside of the machine side wall 121 . The design according to FIG. 7 therefore basically corresponds to the solution according to FIG. 10 of EP-B-984088, whereby in the latter embodiment the air guiding element is connected to the support arm. According to the invention, however, the element 112 should be adjustable in a direction away from the closest point of approach between the card cylinder and the doffer (not shown in Figure 7, cf. point 230 of Figure 2).

In order to allow the last-mentioned adjustment above, the profile 222B may be provided with a support end at each end interacting with the respective flat segment outside the working width of the rollers - one end is indicated by dotted line 223 in Fig. 7 department. Each end portion 223 also has a rod 130 which is guided by a bushing 131 fastened to the arm 112 . At its free end, the rod 130 supports a disc 123, and the spring 120 acts between the bushing 131 and the disc 123 in such a way that the air guiding element is pushed back into a position away from the closest point 230 ( figure 2). However, this movement away from the closest point is limited by an adjustable stop, which in this embodiment is formed by the cam 124 . The cam 124 is fixed to a shaft 125 which is supported in such a way as to allow rotation in the cylinder side wall (not shown in Figure 7). The cam 124 has a cylindrical outer surface (without reference numeral) which is arranged eccentrically with respect to the pivot axis 125 . By rotating the shaft 125, it is thus possible to continuously compress the spring 120 by moving the disc 123 and move the air guide element 222B in the direction of the above-mentioned closest point of approach 230, or to release the spring 120 and thus allow the movement of the element 222B away from the closest point of approach.

The sketches in Figures 7A, B and C each show a possible implementation according to the principle of Figure 7 . In these detailed sketches, the cover plate segment is in each case designated by the reference numeral 125 , the arm by the reference numeral 112 and the air guiding element by the reference numeral 222B. The solutions only show one side of the machine in all cases, but the same solution principle can be applied as a mirror image on the other side of the machine.

In the solution according to FIG. 7 , the aforementioned support head is designed as a slide 150 which runs in a groove-shaped guide 152 in the side of the arm 112 . The rail runs concentrically with the outer surface 1A (not shown in FIG. 7A , compare to FIG. 7 ), so element 222B maintains its end position relative to the outer surface 1A, while it is adjusted relative to the closest point 230 (FIG. 2 ). The bush 131A is designed as a sliding bush, whereby two pivots 154 , 156 must additionally be provided to allow the necessary angular adjustment of the rod 130 relative to the guide element 222B.

In Fig. 7B, the solution to the guiding problem remains the same, and the same reference numerals 150, 152 are used for the slider and the guide groove, respectively. In this variant, however, the bushing 131B has the function of guiding the rod 130 ; it serves here only to mount the compression spring 120 ( FIG. 7 ). The opening in the bushing 131B must allow sufficient clearance relative to the rod 130 to allow changing the angular position of the rod 130 (indicated by dashed lines) during the adjustment movement of the element 222B.

In the solution according to FIG. 7C , the rod 130 is guided by two sliding bushes 131C, thus allowing only a linear movement of the rod and element 222B, as indicated by the dashed lines in FIG. 7C . The adjustment of the element 222B in the circumferential direction is thus in this case accompanied by an adjustment in the radial direction. To simplify the sketch, during movement of the element in the direction of the closest point 230 (FIG. 2), a radial adjustment of increasing radial distance is assumed, whereby during adjustment in the direction of the closest point, through the sliding bushing 131C The design of the geometry can provide a reduction in the radial distance.

A shaft 125 may be provided for both cams 124 and may extend through the cylinder side wall on one or both sides of the card so that the shaft 125 is accessible to the operator. On the outside of the side walls, the shaft may have a hand crank or a device for a hand crank, so that the adjustment of the air guiding element 222B along the arm 112 can be done manually from a predetermined position near the carding machine.

This allows the adjustment of the air guiding element 222B in the circumferential direction of the card cylinder, whereby the adjustment of the air guiding element in the radial direction must still first be carried out on one side of the card and then on the other side - or both at the same time. sideways. It is obvious to the person skilled in the art that the adjustment in the radial direction can also be performed by means of a continuous shaft which has to be arranged below the cylinder 6 and connected to the movement on the arm 112 by means of suitable transmission elements stop block.

Of course, the shaft 125 could (also) be connected to a controlled motor, so adjustments could be made in a controlled manner without direct manual intervention. A suitable actuator for this purpose is shown schematically, for example, in EP-A-627508 (Figs. 12 and 13), and a motor with a piezoelectric encoder is described in Fig. 2 of EP-B-787841. Further development. A common adjustment shaft for radial adjustment can also be driven by a motor, or a controlled motor can be provided for each of the two stops on the arm 112 .

The embodiment according to figures 6 and 7 is intended only as an example of two possible forms of the actuator and should not be seen as limiting in any way. One possibility, FIG. 6 , consists in performing all movements of the air-guiding elements by means of one controlled actuator, which can be controlled, for example, from the control panel of the machine—compare FIG. 9 below. A second possibility, FIG. 7 , consists in carrying out the movement by means of a relatively simple adjustment mechanism, which can preferably be driven from one adjustment position, ie without having to provide actuating elements on both sides of the machine. Numerous alternative embodiments are known which satisfy the requirements of both possibilities. For example DE-A-3702588 shows controlled actuators for the linear movement of the working elements of a carding machine (Figures 2, 5 and 6 of the DE publication), and for the controlled rotational movement of such elements (Figures 3 and 4 ) controlled actuator. Controlled rotational movements are also known and described in DE-A-3825419 and DE-A-10231829. The same actuator can in principle be used together with the adjustment of the air guiding element.

If the air guiding elements are to be continuously set by the operator, as in FIG. 7 , it is not absolutely necessary to define a reference point for the controller. A given value, such as a predetermined distance between adjacent working elements, can be determined and monitored by an operator. The effect of the new setting can also be observed directly on the cotton net product, and if the result of the first adjustment is unsatisfactory, further adjustments can be made as needed. However, at least for automatic operation, the reference point must be determined, so that the regulation initiated by the controller starts from a predeterminable starting position. A possible reference point is shown in FIG. 8 , whereby the diagram is illustrated only as a principle example and never as a specific implementation.

In FIG. 8 the cylinder is likewise indicated by the reference numeral 6 and the curve 6A represents the outer surface of the card clothing. The direction of movement of the clothings is indicated by arrows. The air directing element is indicated at 822 and is shown in greatly simplified form to simplify illustration. The element 822 has an "inner surface" 823 which should be at least at one point at a given distance from the outer surface 6A of the cylinder wire. Furthermore, the element 822 has a nose 824A which should be kept a given distance from the closest point of approach 230 (compare FIG. 2 ) between the cylinder 6 and the doffer (not shown in FIG. 8 ). In Fig. 8, it has been assumed that the inner surface 823 remains at a given distance from the clothing at two points, namely at point 824B (distance b) and at point 824C (distance c). The distance b is, for example, 1-5 mm, and the distance c is 0.5-3 mm.

Three stoppers 830, 831 and 832 are provided for determining the reference value of the above distance. The distances mentioned above each have a predetermined value when the member 822 contacts all the stops. The actuator can start from these preset values when performing control movements. From its position in contact with the stop 830 , the element 822 can be moved within a predetermined adjustment range t in the circumferential direction of the cylinder 6 . This adjustment range covers, for example, an interval t of 5-30 mm. The invention is not limited to the system shown for reference point formation. For example, a measuring device can be provided to measure the distance between a given point on the air guiding element and a corresponding reference point on the machine frame, for example on the cover section (bend). When using a separate encoder with the actuator, a reference outside the actuator is not necessary if the actuator is installed in the machine at the intended location.

Figure 9 shows a detail of Figure 1 to schematically illustrate the connection between the machine and the controller. Elements already explained in conjunction with FIG. 1 are not repeated here. However, a console 900 is provided for the illustrated machine, having a computer 902 , a monitor 904 and a keyboard 906 . Computer 902 receives signals from sensor elements in the machine and provides signals to actuators on the machine. Only the actuator 908 for the air guide element 922 is important in connection with the invention.

Three sensor elements 910 , 911 and 912 are shown schematically, so that these sensor elements only serve as examples of a large number of possibilities. Element 910 is a sensor for measuring the relevant distance between the air-guiding element and the reference point, as already described for example in conjunction with FIG. 8 . Measuring systems for measuring relatively small distances of this type are known, for example, from DE-A-4235610 and EP-A-1158078.

Element 911 is a camera, for example according to DE-A-10259475, for monitoring the conditions in the gap upstream of the air-guiding element. Images produced by the camera 911 may be displayed on the monitor 904 .

Element 912 is a sensor for detecting the quality of the cotton web product.

Such elements are known, for example, from DE-A-4115968, DE-A-3928279, EP-A-738792 and EP-A-1068380.

The operator can now enter via the keyboard a setpoint for the distance between the air guiding element and a given reference point. This setpoint or setpoint serves at least as a basic setting. The computer then provides a signal to the actuator 908, whereby the air guiding element is moved into a defined base position, whereby the signal from the measurement sensor 910 is evaluated by the computer. However, it is now possible to have the sensor 912 detect defects in the web and transmit its signal to the computer 902 . The computer evaluates the signal from the sensor 912 and in the event of a fault it can be corrected by changing the setting of the air guiding element if then providing a signal to the actuator 908 to initiate the necessary adjustments taking into account the signal from the sensor 910 . It is also possible that the operator finds a problem in the gap monitored by the camera 911 from the image displayed on the monitor 904 . Since a new adjustment of the air guiding elements can also be performed during the operation of the card, it is possible to enter a new setpoint for the positioning of the air guiding elements via the keyboard and to observe in the monitored gap and at the product The effect of the change.

The solution of the actuator according to FIGS. 6 and 7 is suitable for adjusting the air guiding element over the entire working width. They may also be controlled and/or operated from predetermined "adjustment positions". In the case of the solution according to FIG. 6 , this adjustment location is, for example, next to the console, where the operator can issue control commands for the actuators by means of operating elements, such as a keyboard or a monitor. This adjustment position is undoubtedly easier to reach for the machine operator. But also in the case of the solution according to FIG. 7 , the operator is now able to adjust the air guiding element from an adjustment position close to at least one end of the shaft 125 ( FIG. 7 ), even during the operation of the card.

It will be obvious to a person skilled in the art that a suitable locking device can be provided in order to securely hold the air guiding element in a selected operating position, but which can therefore also be released. In the case of a manually operated adjustment device (for example according to FIG. 7 ), the locking device can also be manually operated, for example in the form of a pawl, which prevents the cam from rotating. In the case of a controlled actuator (for example according to FIG. 6 ), the locking device can also be controlled.

Claims (15)

1. carding machine, have one and be used for influencing the stream induction element of flow regime of transferring to doffer's zone at fiber from cylinder, it is characterized in that a kind of adjusting device, it is suitable for raising the throttling induction element at whole working width, and it can be operated from predetermined adjustment position.

2. carding machine as claimed in claim 1 is characterized in that: adjusting device comprises controlled actuator, and it is controlled that this actuator can be adjusted the position from this.

3. carding machine, have one and be used for influencing the stream induction element of flow regime of transferring to doffer's zone at fiber from cylinder, it is characterized in that a kind of guider that is used to flow induction element, its permission is regulated in the circumferencial direction of cylinder this stream induction element.

4. one kind is used to adjust the regulator of the distribution of air and fibre stream by locating at least one air guide element in the transfer from drum cylinder to the doffer, wherein this air guide element is set to relative with at least one of drum cylinder and doffer after installation, so that working clearance of formation between at least one of air guide element and drum cylinder and doffer, it is characterized in that: air guide element (22,222,228,322) has at least one reference point (223), it can be along at least one surface (a 226) certain distance (225) and (226) line (224, a 324) motion of extending substantially surfacewise of leaving drum cylinder (6) and doffer (8).

5. regulator as claimed in claim 4 is characterized in that: described line (224,324) forms the part circle, and this circle central point is positioned on drum cylinder (6) and doffer's (8) at least one the axis.

6. as claim 4 or 5 described regulators, it is characterized in that: air guide element (22,222,228,322,422) and the distance between at least one of drum cylinder (6) and doffer (8) be adjustable, and/or air guide element (22,222,228,322,422) have the reference point that axle (331) extends through, air guide element (22,222,228,322,422) can rotate around this axle (331).

7. as a described regulator among the claim 4-5, it is characterized in that: air guide element (22,222,228,322,422) be connected to control device, by this control device air guide element (22,222,228,322,422) motion can be controlled.

8. as a described regulator among the claim 4-5, it is characterized in that: this regulator comprises at least one optical detection element (432).

9. as a described regulator among the claim 4-5, it is characterized in that: this regulator comprises at least one sensor.

10. device as claimed in claim 9 is characterized in that: this regulator comprises flowmeter.

11. device as claimed in claim 7 is characterized in that: this control device is carried out the comparison with set-point.

12. device as claimed in claim 7 is characterized in that: this control device comprises a control loop, and by means of this control loop, the motion of air guide element (22,222,228,322,422) can automatically perform.

13. one kind is used to adjust the method for adjustment of the distribution of air and fibre stream by locating at least one air guide element at the branchpoint from drum cylinder to the doffer, thus

-after installation this air guide element be set to relative with among drum cylinder and the doffer at least one,

Form a working clearance between-in air guide element and drum cylinder and doffer at least one, it is characterized in that: air guide element (22,222,228,322) has at least one reference point (223), this reference point can be along (226) line (224, a 324) motion of extending and can being directed substantially surfacewise.

14. the method described in claim 13 is characterized in that: can carry out optics control by the optical detection element.

15. a described method as among the claim 13-14 is characterized in that: a control device and measured value detection system are provided, its

-with measured value with can be predetermined set-point relatively;

-execution relocating under measured value and set-point situation devious to air guide element (22,222,228,322).

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