WO2011150527A2

WO2011150527A2 - Device for setting a carding gap in a revolving flat card

Info

Publication number: WO2011150527A2
Application number: PCT/CH2011/000116
Authority: WO
Inventors: Emil Medvetchi
Original assignee: Maschinenfabrik Rieter Ag
Priority date: 2010-06-02
Filing date: 2011-05-20
Publication date: 2011-12-08
Also published as: DE112011101863A5; CN102906321A; CN102906321B; WO2011150527A3; CH703251A1

Abstract

The invention relates to a device for setting a carding gap in a revolving flat card, comprising a machine frame and a drum having a drum axis, wherein the drum is provided with a drum clothing, and comprising a revolving flat arrangement, which is formed by a plurality of revolving flats, which are connected to each other and provided with flat clothings. The revolving flats are guided along the circumference of the drum at the ends of the revolving flats on sliding surfaces of flexible bows arranged on both sides of the revolving flat card. The carding gap can be changed by changing the radial position of the flexible bow or parts thereof with respect to the drum axis. The flexible bow is retained at at least three support points of the machine frame by means of support elements, and a sliding element is provided between the flexible bow and the support elements in such a way that the radial position of the flexible bow and thus the carding gap can be simultaneously adjusted at all support points by moving the sliding element.

Description

Device for setting a carding gap in a revolving flat card

The present invention relates to a device for adjusting a carding nip in a revolving flat card.

In a carding machine, the lid area together with the drum forms the main carding zone and, as a function, has the dissolution of the flakes into individual fibers, removal of impurities and dust, elimination of very short fibers, the dissolution of nits and the parallelization of the fibers. Depending on the application of a card, fixed covers, revolving lids or a mixture of fixed and revolving lids are used. When using a revolving lids or a mixture of hard covers and revolving lids, one speaks of a revolving flat card. Between the sets of covers and the clothing of the drum forms a narrow gap called the carding nip. It results in the use of revolving lids by the revolving lids, guided by arcuate strips - so-called flexible arch, Regulierbogen, Flexbogen or Gleitbogen - are guided along a predetermined distance by these strips in the circumferential direction of the drum. The size of the carding nip lies with a revolving flat card between 0.10 to 0.30 mm for cotton or up to 0.40 mm for man-made fibers.

It is known that the flexible elbow must be designed to be radially adjustable in order to ensure a consistent over the entire course of the flexible arch carding. The radial adjustability is necessary for various reasons:

a) To readjust the carding gap during the production of the card or after a replacement of the drum set. In this case, an individual adjustment of individual bearings is necessary to allow a concentric adjustment of the flexible sheet opposite the drum surface.

b) For adjustment of the carding gap in case of wear of the trimmings, in which case a uniform adjustment of all bearings is desired.

c) To re-adjust the carding gap after sanding the sets. d) To correct the carding gap due to the thermal expansion of the drum.

The present invention addresses the problem of adjusting and correcting the carding gap setting after making the basic setting of the flexographic sheet.

In EP 1 201 797 a device for adjusting the carding nip has been proposed, in which the flexible sheet is supported on rotatably mounted rollers. The rollers are designed as rotatable helical cams. Upon rotation of these cams is raised by the worm shape of the flexible bend at the corresponding support point and in the radial direction away from the drum axis or to these. The fact that all cams are interconnected and moved at the same time, a uniform adjustment of the flexible bend over all bearings is possible. For a further type of adjustment of the flexible bend this is even moved in the drum rotation direction, which means that changes the radial distance of the flexible sheet of the drum axis.

A disadvantage of the device is that either the entire flexible sheet has to be moved or a complicated mechanism is necessary to adjust the carding gap. In particular, the fine adjustment is provided by the movement of the flexible sheet itself, which is associated with a considerable expenditure of force and leads to a displacement of the flexible sheet along the drum surface.

In CH 693 674 A5, a device is proposed, which provides for the arrangement of a second arc below the flexible bend. The two contacting surfaces of the sheets are not concentric with the drum surface. Now, if one of the two sheets is moved in its longitudinal direction, this causes a radial displacement of the surface of the flexible sheet and thus a change in the carding gap. The disadvantage of the device is that a precise production of the sheet is necessary and a radial adjustment of the sliding surface of the flexible sheet, on which the moving lid are guided, is not possible. The invention of the present application has for its object to provide a device for adjusting a flexible sheet and thus the carding of a Wanderdeckelkarde simple construction, which allows exact adjustment of the carding through a relative to the drum axis radial displacement of the sliding surface of the flexible sheet and independent of the number of bearing points of the flexible bend and their coarse adjustment is.

The object is solved by the features in the characterizing part of the independent claims.

To solve the problem, an apparatus for adjusting a carding nip in a revolving flat card with a machine frame and a drum with a drum axis is proposed, wherein the drum is provided with a drum set. The Wanderdeckelkarde is provided with a revolving lid assembly, which is formed from a plurality of interconnected and provided with flat fittings moving lids, wherein the revolving lids are guided at their ends on sliding surfaces of both sides of the Wanderdeckelkarde arranged flexible arc along the circumference of the drum. The carding nip is changeable by changing the radial position of the flexible sheet with respect to the drum axis or parts thereof. The flexible sheet is held at least three supporting points of the machine frame via support members and between the flexible sheet and the support elements, a displacement means is provided such that by moving the displacement means, the radial position of the flexible sheet and thus the carding at all support points is adjustable simultaneously. The flexible bend is supported on the machine frame. For this purpose, several support points, so-called support points are provided. The number of support points depends on the design of the flexible sheet, in particular its length. For stable storage at least three support points are necessary. The support points may be arranged symmetrically or asymmetrically with respect to the flexible arch. However, if the flexible sheet is executed in several parts or leads over a larger circumference of the drum, more than three support points, for example five support points, are necessary. The storage of the flexible sheet takes place in such a way 2011/000116

4 that the traveling lid sliding on the flexible sheet are guided in the desired manner along the surface of the drum.

Various designs of supporting points for flexible sheets are known from the prior art. Normally, these support points are provided adjustable to make an adjustment of the flexible sheet and thus the carding gap at the individual support points can. The supporting elements used for this purpose are known in various designs. For example, the support elements can be formed from bolts, screws or circular segments. The support elements used in each case form at a support point a point or line support for the flexible sheet, which are referred to as support points in the sequence.

According to the invention, it is provided that a displacement means is arranged between the flexible sheet and the respective support point of a support element. The flexible sheet is held on at least three support points from the machine frame via support elements. Between the flexible sheet and the support elements, a displacement means is provided such that by moving the displacement means, the radial position of the flexible sheet and thus the carding gap at all support points is simultaneously adjustable.

The displacement means is designed such that on the one hand results in a distance between the support point of the support element and the flexible bend, which is occupied by the dimensions of the displacement means, and on the other hand changed by a movement of the displacement means, this distance between the respective support member and the flexible bend radially to the drum axis , The displacement means is composed of the supporting elements associated displacement elements and intermediate connecting elements. The displacement elements are designed the same for all support points or support points. The displacement element consists of a conical element, which causes by its displacement an enlargement or reduction of the distance between the support point and the flexible bend. The individual displacement elements are connected via connecting elements, whereby only one movement of all displacement elements can take place together. As connecting elements, elements known from the prior art can be used, for example cables, wires, sheets.

Sliding elements and connecting elements can also be assigned to an integrally manufactured displacement means. In this case, the region of the displacement means to be assigned to a support point forms the displacement element, and that part of the displacement means which is located between the support points can be seen as a connecting element.

The displacement means is connected to a drive. Advantageously, this drive is arranged at one of the ends of the displacement means. However, it is also an endless design of the displacement means conceivable, wherein the drive is to be arranged at a technically favorable location. As a drive, a manual drive or a motor drive can be provided. As motor drives are, for example, electric motors or pneumatic and hydraulic drives. The drive is held by the machine frame and connected to the displacement means such that a movement of the displacement means in the region of the support points in the circumferential direction of the drum is possible.

In a further embodiment, the displacement means is connected to a tensioning means. Advantageously, the tensioning means is arranged at the end of the displacement means, which lies opposite the drive. By means of the clamping means, the displacement means is connected to the machine frame and causes a tension of the displacement means, so that a play-free movement of the displacement means by the drive is possible. The tensioning means also allows movement of the shifting means in both directions by the drive.

In an endless design of the displacement means is advantageously one of the pulleys perform as a clamping device. Thereby, a play-free movement and a fixation of the set position of the displacement means can be ensured. In an advantageous embodiment, the displacement means may be embodied, for example, as a metal strip leading over the support points. The sheet-metal strip is provided with a uniform shape change in each case in the region of a support point, so that the distance between the support point of the support element and the flexible bend changes as the sheet-metal strip moves in the circumferential direction of the drum. Since such a sheet metal strip is moved by all bearings simultaneously, learns the flexible sheet in its entirety a simultaneous adjustment of the radial distance to the drum axis at all Abstützpunkten. The metal strip is designed at each support point with such a change in shape that moving the metal strip in the circumferential direction of the drum causes a change of the carding nip. The change in shape of the displacement means at the location of a respective support element is designed such that for a change of the carding nip by 0.01 mm, the displacement means must be moved by 2 to 10 mm. Advantageously, a movement of the displacement means in the circumferential direction of the drum by 2 mm causes a change in the carding gap of 0.025 mm.

In a further development of the invention, the proposed device can be used as automatic Deckelaktorik for a Wanderdeckelkarde. In combination with a known measuring device for measuring the carding nip, automatic adjustment of the carding nip via such a lid actuator can be carried out by a controller. In this case, data are forwarded by the measuring device to the controller, which allows the control via the displacement means to influence the carding gap in such a way that the carding gap is in a predefined area. As measuring devices, for example, mechanical measuring devices or electronic measuring devices can be used.

For example, a predetermined range for the carding nip in a revolving flat card is less than 0.1 mm. Preferably, the area to be maintained by a cover actuator for the carding gap in today's precision machines is less than 0.05 mm, for example 0.01 mm. In the following the invention will be explained with reference to an exemplary embodiment and explained in more detail by drawings.

Figure 1 Schematic representation of a side view of a revolving flat card according to the prior art

FIG. 2 Schematic representation of the cross section X-X according to FIG. 1

Figure 3 Schematic representation of a storage of a flexible arch after the

State of the art

Figure 4 Schematic representation of an embodiment of the invention

Figure 5 Enlarged view of a support point according to the invention

Figure 6 displacement means in a schematic representation

FIG. 1 shows a known revolving flat card 1. Flakes are fed from a filling shaft 2 to a fiber feeding device 3 and a subsequent drum 4. The revolving flat card 1 comprises a single drum 4 (main cylinder or so-called drum), which is rotatably supported in a machine frame 5. The drum 4 works in a known manner with a traveling lid assembly 6, a fiber feeding device 3, and a fiber pickup 8 together, the latter in particular has a so-called takers 9. Carding elements and fiber guiding elements, which are not shown here in detail, can be arranged between the revolving lid arrangement 6, the fiber feeding device 3 and the fiber dispensing system 8. The fiber-receiving system 8 conveys the sliver 10 to a schematically indicated sliver storage 11.

A plurality of revolving lids 13 are provided on said revolving cover arrangement 6, wherein only individual revolving lids 13 are shown schematically in FIG. Currently used traveling lid assemblies 6 include closely spaced a plurality of traveling lids 13 that circulate. For this purpose, the moving lid 13 are supported in the vicinity of their respective end faces of endless belts 12 and moved against or with the direction of rotation of the drum 4 and guided on flexible sheet 7 on the underside of the traveling lid assembly 6 on the surface of the drum 4 along. 2 shows a cross section through the revolving flat card in the drum axis at the point XX of Figure 1 is shown. The machine frame 5 is shown schematically by the drum plates attached to the flexible sheet 7 on both sides of the drum 4. Also held by the machine frame 5, the drum 4 with the drum axis 16. The attachment of the flexible sheet 7 via support elements (not shown). On the flexible sheet 7, the moving lid 13, which are guided on endless belts 12 of the surface of the drum 4 along. The drum 4 is provided on its surface with a drum set 15. The moving lid 13 are provided with a flat fitting 14 on its underside, which is arranged opposite the drum 4. Flat set 14 and drum set 15 are arranged uniformly over the working width B of the Wanderdeckelkarde. Between the flat clothing 14 and the drum set 5, the carding gap A is formed, which normally has a constant height over the entire working width B. The carding gap A is shown greatly enlarged in FIG. 2 and is between 0.4 and 0.15 mm for today's precision carding machines. If the drum set 15 or the cover set 14 are reground, the carding gap A increases in the order of 0.05 to 0.1 mm.

FIG. 3 schematically shows a flexible bend 7 according to the prior art. The flexible sheet is held at three supporting points 22 by supporting elements 21. On the side opposite the supporting elements 21 side of the flexible arch is the sliding surface 20 on which the revolving flats are guided. The support elements 21 are shown by way of example as circle segments, which are connected to the machine frame. Other shapes of the support elements 21, such as round bolts or adjusting screws, are likewise possible as long as a point-like or line-shaped support point for the flexible bend 7 results.

FIG. 4 shows a schematic representation of a flexible bend 7 with three support points 22. At each support point 22, the flexible bend 7 rests on a support element 21. Between the support point of the support element 21 and the flexible sheet 7, a displacement means 40 is inserted. The displacement means 40 is provided such that it is guided through all support points 22 of the flexible sheet 7. In the region of the support points 22, the displacement means 40 is designed with a varying thickness. During a movement 41 of the displacement means 40 in the circumferential direction of the drum, this causes the flexible sheet 7 to be displaced radially relative to the support point of the support element 21 in relation to the drum axis 16.

The displacement means 40 is connected at one of its ends to the machine frame 5. The displacement means 40 is held flexibly in the machine frame 5. The holder is designed for example with a spring or other clamping means 43. At a bias voltage of the clamping means 43 is ensured that the displacement means 40 is movable in both directions along the drum surface and can be held in a selected position. For movement 41 of the displacement means 40, this is connected at its second end to a drive 42. The drive 42 can be done manually or by motor, for which purpose various drive means are suitable, for example electric motors or pneumatic drives.

If the drive 42 is connected to a controller 45, which in turn is connected to a measuring device 44 for determining the height of the carding gap A, a cover actuator can be operated with the aid of the displacement means 40. A lid actuating mechanism is used for automatic adjustment of the carding gap A between the flat clothings 14 of the revolving lids 13 and the drum set 15 of the drum 4 of a revolving flat card 1 (see FIG. 2). If the drum sets 15 or the cover sets 14 are reground, for example, this change in the carding gap A is detected by the measuring device 44 by the controller 45 and compensated automatically by a movement 41 of the displacement means 40.

Figure 5 shows an embodiment of a displacement means 40 in a schematic representation. As a displacement means 40 while a metal strip 50 is provided, which is guided through all support points 22 therethrough. The metal strip 50 is between the see support member 21 and the flexible sheet 7 threaded. In the area of a support point 22, the metal strip 50 is ground in each case and forms the displacement element 51. Due to the shape of the displacement element 51 results a change in the distance between the support element 21 and the flexible sheet 7 proportional to the movement 41 of the displacement element 51. The displacement elements 51 are connected via connecting elements 52 with each other. Assuming that the support element 21 is stationary, the distance between the support elements 21 and the flexible bend 7 is increased or reduced in a movement 41 of the displacement element 51. As a result of the connection of the individual displacement elements 51 with the connection elements 52, the flexible arch 7 is at the same time displaced radially relative to the drum axis 16 at all supporting points 22. Instead of a metal strip 50, another displacement means 40 can be used, which withstands the load of the flexible sheet 7.

FIG. 6 shows a displacement means 40 in a schematic representation. The displacement means 40 is composed of the displacement element 51 and the connection elements 52, wherein the displacement element 51 is arranged in the region of the support point 21. The displacement element 51 is provided with a linear change in shape in a region of the support point 21, shown as a change in the cross section of the displacement element 51 under a deformation angle. As a result, in the case of a movement 41 of the displacement element 51, an elevation standing in a linear relationship to the movement 41 of the displacement element 51, respectively lowering of the support point of the flexible sheet causes.

Legend

1 revolving flat card

2 hopper

3 fiber feeding device

4 drum

5 machine frame

6 revolving lid arrangement

7 flexible bend

8 fiber pickup system

9 customers

10 sliver

1 sliver tray

12 endless belt

13 revolving lids

14 flat fitting

15 drum set

16 drum axis

20 sliding surface

21 support elements

22 support point

40 shifting means

41 Movement of the shifting means

42 drive

43 clamping devices

44 measuring device

45 control

50 sheet metal strips

51 sliding element

52 connecting element

A carding nip

B working width

α strain angle

Claims

claims

Anspruch [en] A device for setting a carding nip (A) in a traveling blanket (11) with a machine frame (5) and a drum (4) with a drum axis (16), the drum (4) being provided with a drum set (5), and with a revolving flat top arrangement (6) which is formed from a multiplicity of revolving lids (13) provided with flat fittings (14), the revolving lids (13) being arranged at their ends on sliding surfaces (20) on both sides of the traveling blanket (1) Flexible bow (7) are guided along the surface of the drum (4) along, wherein the carding gap (A) by a change in, with respect to the drum axis (16) radial position of the flexible sheet (7) or parts thereof, is changeable thereby in that the flexible sheet (7) is held on at least three support points (22) of the machine frame (5) via support elements (21) and between the flexible sheet (7) and the support elements (21) Verschi ebemittel (40) is provided such that by moving (41) of the displacement means (40), the radial position of the flexible sheet (7) and thus the carding gap (A) at all support points (22) is simultaneously adjustable.

2. Apparatus according to claim 1, characterized in that the displacement means (40) from the support points (22) associated with displacement elements (51) and intermediate connecting elements (52) is composed.

3. Apparatus according to claim 1 or 2, characterized in that the displacement means (40) is connected to a drive (42).

4. Apparatus according to claim 1 to 3, characterized in that the displacement means (40) with a tensioning means (43) is connected.

5. Apparatus according to claim 1 to 4, characterized in that the displacement means (40) is designed as a sheet-metal strip (50). Apparatus according to claim 5, characterized in that the metal strip (50) at each support point (22) is designed with such a change in shape that moving the metal strip (50) in the circumferential direction of the drum (4) causes a change in the carding gap (A) ,

Deckelaktorik for a revolving flat card (1) with a device according to one of claims 1 to 6, with a measuring device (44) for measuring the carding nip (A) and a controller (45), characterized in that of the measuring device (44) data to the controller (45) are forwarded, which enable the control (45) via the displacement means (40) to influence the carding nip (A) such that the carding nip (A) is in a predetermined range.

Deckelaktorik according to claim 7, characterized in that the predetermined range for the carding gap (A) is less than 0.1 mm.