TWI790386B - Drawing devices and spinning preparation machines - Google Patents

Abstract

The invention relates to a pulling device (2) for a plurality of fiber strips (7) coming from a feed container (8), with a support (4) and in the conveying direction (6) of said fiber strips (7) An upwardly extending load-bearing profile (5) having a first side (9) and a second side (10), wherein a plurality of columns are arranged on both sides (9, 10) of the load-bearing profile (5) Shaped, rotatably mounted synchronizing elements (11) about their longitudinal axes, which are configured to convey at least one fiber strip (7) in each case in the conveying direction (6) during their rotation, according to the invention The pulling device is characterized in that each two opposing synchronizing elements ( 11 ) are the only continuous section of the outer face ( 12 ) of the component ( 13 ). Furthermore, the invention relates to a spinning preparation machine, such as a draw frame (1), with a drawing device (2) according to the invention.

Description

Drawing devices and spinning preparation machines

The invention relates to a pulling device (Abzugsvorrichtung) for a plurality of fiber strips from a feeding container (Vorlagebehälter) with a support and a carrier profile extending in the conveying direction of the fiber strips and having a first side and On the second side, a plurality of cylindrical synchronizing elements mounted rotatably about their longitudinal axes are arranged on both sides at the carrier profile, said synchronizing elements being configured to convey at least one fiber band.

Furthermore, the invention relates to a spinning preparation machine with a drawing device.

Drawing devices for fiber webs coming from feed containers are known from textile processing or manufacturing. Drawing devices are required in particular for spinning machines or spinning preparation machines, such as, for example, draw frames. The drawing device is used to supply the fiber strip from which the yarn is spun in a later processing step.

Draw frames are used to draw or stretch and elongate the fiber strips prior to further processing. The fiber web is guided in a known manner by rows of roller pairs rotating at different speeds. An example of this is available in DE 10 2016 110 897 A1.

For example, a common configuration in which a drawing frame is present includes a frame with a carrier profile, beneath which a plurality of feed containers each with a fiber ribbon is arranged, for example in the form of so-called spinning bobbins. A synchronizing element is provided on the carrier profile for each feed container, which transports the fiber strip by rotation from the feed container in the direction of a further processing unit, such as, for example, a drafting device. The tensioning units are usually constructed symmetrically, wherein the synchronizing elements are each arranged in pairs on both sides of the load-bearing profile and are driven via a common shaft.

The housings of the synchronizing elements are usually fixed on the common shaft via common wheels, also known as flanged pulleys, at the ends of the shaft. The shaft is supported on the carrier profile via at least one bearing and usually has a drive pulley, which connects the shaft, for example, to a drive belt.

A detailed description of a stretching device according to the prior art can be found in DE 10 2015 118 808 A1.

In this case, the large number of individual parts required to form the synchronizing element leads to a disadvantageous accumulation of, for example, manufacturing tolerances of the individual parts. This can in turn lead to undesired precession and vibrations of the synchronizing elements, which increases wear and reduces the service life.

It is therefore the object of the present invention to improve the known tensioning device in the area of the synchronizing element. Furthermore, the object of the present invention is to propose a spinning preparation machine with an improved drawing device.

This object is solved by a drawing device and a spinning preparation machine with the features of the independent claims.

A drawing device according to the invention for a plurality of fiber strips from a feeding container comprises a frame with a load-bearing profile extending in the conveying direction of the fiber strips, the load-bearing profile having a first side and a second side. A plurality of cylindrical synchronizing elements mounted rotatably about their longitudinal axes are arranged on both sides of the carrier profile and are designed to convey at least one fiber strip in each direction of transport during their rotation.

It is proposed that every two opposing synchronizing elements are the only outer section of the continuous component.

The number of required individual parts can be significantly limited by means of the components. The component thus combines the already mentioned functions of shaft, housing, drive wheel and flanged pulley in a single element. The component is thus more suitable in terms of manufacture, no build-up of manufacturing tolerances occurs and error-prone connection surfaces between the individual parts are omitted. The synchronizing element for conveying at least two fiber strips is preferably formed by an outer region of the component which adjoins the respective end side.

The mass of the components and thus the moment of inertia are also reduced by minimizing the number of components. This in turn favorably affects the rotational characteristics of the member.

In particular, the surface of the component is electrically conductive in order to dissipate any static electricity that may arise. It is conceivable that only certain sections of the surface are made conductive. In particular, the surface which is in contact with the fiber strip is considered here. Furthermore, the conductive surface or the conductive section of the surface is in particular grounded. Grounding can be effected, for example, via the load-bearing profiles and supports of the tensioning device. However, there can also be separate means for grounding, such as for example at least one sliding contact. It may also be advantageous to roughen or structure the surface in order to improve the fiber transport.

The component can, for example, be embodied as a continuous hollow cylinder with a substantially constant diameter. The member may have a diameter between 3 cm and 10 cm. The length of the member may for example be between 30 cm and 150 cm.

It is especially advantageous if the component is a roller. The rollers can be produced with little effort and have favorable rotational properties. If the component is hollow, it is advantageous if the interior of the component is protected against the penetration and deposition of dirt. For example, end caps can be provided on the end faces of the component.

It goes without saying that, depending on requirements, it is conceivable to implement the rollers as solid, which increases the quality but also the stability at the same time.

It is also advantageous if the outer surface of the component is continuous. This means a homogeneous outer surface without pronounced radial cutouts, as would occur, for example, during production by cutting. Edges at which waste fibers can accumulate or which, by acting on the fiber web, can lead to tearing of the fiber web are thus avoided.

It is conceivable that certain regions of the outer face are provided with a coating and/or with slight indentations, wherein the outer face remains substantially continuous.

For supporting the component it is advantageous if the component is connected to the load-bearing profile via at least one bearing, wherein the connection is preferably produced by crimping. During the crimping, the bearing presses against the outer face of the component, whereby a continuous mechanical pressure is generated in the connection region. The bearing brings about a uniform rotation of the component with low friction. A purely mechanical connection by means of the crimping can, for example, dispense with adhesive bonding.

Bearings are in particular rolling bearings, such as for example ball bearings, with a fixed outer ring. It is particularly advantageous if the component is fastened to the load-bearing profile with two bearings, wherein the bearings are, for example, arranged symmetrically with respect to both sides of the load-bearing profile.

It is conceivable to reinforce the surface of the component in the region of the connection with the bearing, or to provide a somewhat larger diameter here. If the connection is produced by crimping, possible damage to the surfaces can thus be prevented.

It is particularly advantageous if the component is at least partially made of stainless steel, chromed steel or aluminum with an electrically conductive coating. These materials are particularly strong and can be brought into the desired shape, for example by cutting. The electrostatic charge generated can be conducted away via the conductive surface. The conductive surface of the component also allows monitoring of the fiber sheets. For example, the components can form a switching device in a known manner using a monitoring element, which generates an electrical pulse when the fiber strip breaks, which especially causes the pulling device and, if possible, the spinning preparation machine stop. Surface tempering in the case of steel and aluminum has the additional advantage of increasing the wear resistance of the component in question. In particular, surface conditioning can also be achieved by nickel or zinc plating in addition to the already mentioned chromium plating.

In an advantageous development of the tensioning device, the outer surface of the component is connected to the drive belt in a friction fit. As already described, a separate drive wheel for the synchronizing element can be dispensed with in the pulling device according to the invention. The role of the drive wheel can be assumed by the outer face of the member.

For an advantageous force transmission between the drive belt and the outer surface, the drive belt is in particular designed as a flat belt. The drive belt can, for example, transmit the torque of a central drive, in particular an electric motor, to the component.

Alternatively, it is also conceivable to provide a common drive for each plurality of components or to drive each component individually. For example, synthetic materials, such as eg rubber, are suitable as material for the drive belt.

It is also advantageous if the outer surface of the component has a first guide region for guiding the drive element.

The guide region can be designed to increase the friction between the drive belt and the component. For example, a roughening of the outer surface in the guide region or a coating of the outer surface is suitable for this. It is conceivable for the outer recess to be provided in the guide region in order in particular to prevent lateral sliding of the drive belt.

It is particularly advantageous if the outer surface of the component additionally has a second guide region, wherein the diameter of the component in the first guide region differs from the diameter of the component in the second guide region. It is thus possible to run the component at different rotational speeds at the same rotational speed of the drive, depending on which guide region the drive belt is connected to the component. This in turn allows matching the feed speed of the fiber strip, for example into a drafting device coupled to the drafting device. Adapting the feed speed of the fiber webs is desirable, for example, in the case of mixing different fiber webs in predetermined ratios. During mixing, several fiber ribbons are stretched together, whereby new fiber ribbons are produced. The mixing ratio can be controlled here, for example, via the feed speed. The exchange of the guide region in which the drive belt is connected to the component can be effected either by moving the drive belt or by moving the component. In particular it is conceivable to rotate the components (see below).

It is expedient to produce different diameters in the guide regions by means of recesses in one guide region or in both guide regions on the outer face of the component. Alternatively, however, it is also conceivable to provide the outer projections in one guide region or in both guide regions. The protrusions may already be produced during the manufacture of the component or eg by adding attachments later or applying a coating later.

Advantageously, said component has a plane of symmetry perpendicular to its longitudinal axis, and said first guide area and said second guide area are arranged beside said plane of symmetry. In many embodiments, it goes without saying that the described plane of symmetry occurs during production of the component, for example when the component is formed as a roller. The described symmetry of the components also leads to a suitable alignment of the synchronizing elements on both sides of the pulling device. Arranging the two guide areas alongside the plane of symmetry has the advantage when also arranging the drive belt beside the plane of symmetry, that by mounting the component with a 180° rotation about the plane of symmetry it is possible to achieve the A change in the rotational speed of a component. In particular, the guide region is likewise arranged symmetrically with respect to the plane of symmetry.

Furthermore, for the controlled transport of the fiber strand it is advantageous if the pulling device has at least one load roller per component, which is connected to the outer surface of the component in the contact region. In this case, the at least one load roller can press the fiber strip against the outer surface of the component and thus increase friction and prevent the fiber strip from slipping. The load rollers can also, for example, dampen vibrations of the component and thus contribute to improved rotation.

In particular, the tensioning device has two load rollers per component, one load roller being arranged on each side of the tensioning device. For example, the pulling rollers and thus the contact area can likewise be arranged symmetrically with respect to the plane of symmetry of the component. It is conceivable that the load roller is pressed against the outside of the component by the pressure of a spring. For the case of maintenance work or for mounting and dismounting the component, it is advantageous if the load roller is mounted in a foldable manner. Furthermore, the load roller can have a friction-promoting surface, for example made of rubber.

It is additionally advantageous if the diameter of the component in the contact region differs from the diameter of the component outside the contact region. For example, a recess in the contact area can help to guide the fiber strip. More importantly, however, the speed of movement of the fiber strip can be influenced by the diameter in the contact region while the rotational speed of the components remains the same. In the case of a diameter reduction in the contact area, the movement speed of the fiber strip decreases while the properties of the pulling device generally remain unchanged.

If the load rollers or the contact areas are arranged symmetrically on both sides of the tensioning device, it is conceivable to provide different diameters in the two contact areas. It is thus possible, for example, to achieve different speeds of movement of the fiber strip on both sides of the component despite the presence of a common drive. As already mentioned, this can be advantageous for mixing the fiber strips in a predetermined fixed ratio.

In the case of a spinning preparation machine according to the invention with a drawing device, in particular in the form of a draw frame, it is proposed that the drawing device is configured as described above and/or below. The already described advantages of the drawing device according to the invention therefore continue to the spinning preparation machine.

It goes without saying that the embodiment of the drawing device should be adapted to the requirements of the spinning preparation machine. For example, a spinning preparation machine with a drawing device having a total of three components is conceivable, in which fiber strips can be drawn from six feed containers and processed.

The drafting device of the draw frame, in which the drawing and possibly mixing of the fiber strips takes place, comprises a plurality of roller pairs, which rotate at different speeds.

Furthermore, the spinning preparation machine may comprise sensors for monitoring and means for guiding the fiber strip.

Further advantages of the invention are described in the following examples. in:

In the following description of the figures, the same reference signs are used for features which are respectively identical and/or at least equivalent in the different figures. Individual features, their configuration and/or mode of action are mostly explained in detail only at their first mention. If the individual features are not explained again in detail, their design and/or mode of operation correspond to those of the already described features with the same function or with the same name.

FIG. 1 shows a draw frame 1 according to the invention (as an example of a spinning preparation machine) comprising a drawing device 2 and a machine housing 3 only partly shown, in which there is a belt There are generally multiple roller pairs in the drafting arrangement. The tensioning device 2 has a support 4 to which a support profile 5 is fastened. The carrier profile 5 extends in the conveying direction 6 ( FIG. 2 ) of the fiber web 7 ( FIG. 2 ), which is drawn from the feed container 8 and conveyed in the direction of the machine housing 3 .

The support profile 5 has a first side 9 and a second side 10 , wherein on both sides ( 9 , 10 ) synchronizing elements 11 are arranged which ensure the described conveyance of the fiber strip 7 . Every two synchronizing elements 11 are formed by the outer faces 12 of the respective continuous component 13 . The component 13 is configured as a roller, for example. The components 13 can be set in rotation, for example via a drive belt 14 ( FIG. 4 ), in particular by a common drive 15 . The carrier profile 5 can simultaneously serve as a housing for the drive belt 14 .

The components 13 are each fastened to the load-bearing profile 5 by two symmetrically arranged bearings 16 . The bearing 16 brings about a low-friction and uniform rotation of the component 13 . Furthermore, the drawing device 2 has, in particular for each synchronizing element 11 , a load roller 17 which presses the respective fiber strip 7 against the outer face 12 of the component 13 . The load rollers 17 can be mounted, for example in pairs, jointly and in particular in a foldable manner.

In this embodiment the drawing device 2 comprises three components 13 which can be divided into six synchronizing elements 11 and which are able to simultaneously convey the same number of fiber strips from six feeding containers 8 in the direction of the machine housing 3 7. It goes without saying that the drawing device 2 according to the invention can be dimensioned almost arbitrarily according to the requirements of the machine for further processing the fiber strip 7 .

FIG. 2 schematically illustrates the transport direction 6 of the fiber strip 7 from the feed container 8 in the direction of the machine housing 3 . The stretching device 2 here preferably has the same features as the stretching device 2 from FIG. 1 . A continuous component 13 arranged on the carrier profile 5 is characteristic, which forms the synchronizing element 11 for the fiber strip 7 . Different filling levels of the fiber strip 7 are shown in the feed container 8 . This fill level can then be configured, for example, if the fiber strip 7 is drawn at different speeds. This can be brought about in particular by an advantageous embodiment of the component 13 , as will be explained further in the following figures.

FIG. 3 illustrates possible geometrical properties of the member 13 . The synchronizing element 11 , the guide areas 20 , 21 for the connection to the drive belt ( FIG. 4 ) and the contact areas 18 , 19 for the connection to the load roller 17 are arranged symmetrically with respect to the plane of symmetry 22 . The component 13 has a diameter D2 in the first guide area 20 , a diameter D3 in the second guide area 21 , a diameter D4 in the first contact area and a diameter D5 in the second contact area. Outside the mentioned regions 18 , 19 , 20 , 21 the component 13 has a component diameter D1 . D1 is in particular the diameter with which the component 13 is produced, wherein the other diameters D2 , D3 , D4 , D5 are produced by additional machining of the component 13 . This further machining can be, for example, machining or applying a coating. It is also conceivable to add at least one attachment in the respective area 18 , 19 , 20 , 21 . Diameters D1, D2, D3, D4 and D5 may all be different. It is however conceivable that some of the diameters D1, D2, D3, D4 and D5 are the same. It is particularly expedient if at least one of the diameters D2 or D3 corresponds to the component diameter D1.

FIG. 4 shows a detailed view of the surroundings of a component 13 of the stretching device 2 according to the invention. The component 13 has a substantially continuous outer face 12 which forms two synchronizing elements 11 in the outer region of the component 13 . Two symmetrically arranged load rollers 17 are frictionally connected to the outer face 12 in a first contact region 18 and in a second contact region 19 . In order to improve friction, the load roller 17 can have a friction-increasing surface, for example a surface made of rubber.

A drive belt 14 , for example a flat belt, is provided for driving the component 13 , which is frictionally connected to the outer face 12 of the component 13 in the first guide region 20 . In addition, the outer face 12 of the component 13 can have a second guide region 21 . The diameter D3 of the component 13 in the second guide area 21 may differ from the component diameter D1 and in particular from the diameter D2 of the component 13 in the first guide area 19 . In addition, the two guide regions 20 , 21 are arranged symmetrically spaced apart with respect to the plane of symmetry 22 of the component 13 . Thus, if the component 13 is rotated by 180° around an axis existing in the plane of symmetry 22, the drive belt 14 is connected to the outer face 12 of the component 13 in the second guide area 21, which due to the change in speed of the drive belt 14 is constant The diameter D3 results in a change in the rotational speed of the member 13 .

Two symmetrically arranged bearings 16 are provided for the support component 13 , which are designed, for example, as roller bearings. For connection to the outer face 12 of the component 13 the bearing 16 can be pressed on, for example.

FIG. 5 shows another embodiment for the surroundings of the component 13 of the stretching device 2 according to the invention. The features present largely correspond to those already explained in FIG. 4 . However, the diameters D2 , D3 , D4 in the first guide region 20 , the second guide region 21 and the first contact region 18 are the same as the component diameter D1 . The diameter D5 is for example smaller than the other diameters D1 , D2 , D3 , D4 . As a result, the speed of movement of the fiber strip 7 pulled by the synchronizing element 11 on the side of the second contact region 19 can be reduced. In the case of different diameters D4 , D5 in the two contact regions 18 , 19 it is possible to achieve different speeds of movement of the fiber strip 7 pulled by the component 13 despite the common drive by the drive belt 14 . This is advantageous in particular when a certain mixing ratio of the fiber strips 7 is to be produced.

It is possible to bring about a speed change with the fiber strips 7 facing each other by rotating the components by 180° about an axis present in the plane of symmetry 22 . It goes without saying that it is also possible to adapt the individual speed of the fiber strip 7 brought about by adapting the diameters D4 , D5 in the two contact areas 18 , 19 and by changing the diameter in the two guide areas 20 , 21 . The diameters D2, D3 of the diameters D2, D3 cause the already described adaptation of the rotational speed of the component 13 in combination. A precise adjustment of the speed of movement of the individual fiber strips 7 can thus be achieved by virtue of the precise properties of the component 13 without changing other features of the drawing device 2 .

The invention is not limited to the illustrated and described embodiments. Variations and combinations of features within the framework of the patent claims are also possible, even if they are shown and described in different exemplary embodiments.

1‧‧‧Draw frame 2‧‧‧Pulling device 3‧‧‧Machine shell 4‧‧‧Bracket 5‧‧‧bearing profiles 6‧‧‧Transportation direction 7‧‧‧Fiber belt 8‧‧‧Feeding container 9‧‧‧first side 10‧‧‧second side 11‧‧‧Synchronous components 12‧‧‧outside 13‧‧‧Component 14‧‧‧Drive belt 15‧‧‧Driver 16‧‧‧Bearing 17‧‧‧Loading roller 18‧‧‧First contact area 19‧‧‧Second Contact Area 20‧‧‧The first guide area 21‧‧‧The second guide area 22‧‧‧symmetry plane D1‧‧‧component diameter D2‧‧‧diameter in the first guide area D3‧‧‧diameter in the second guide area D4‧‧‧The diameter in the first contact area D5‧‧‧diameter in the second contact area

Figure 1 shows a view of a draw frame according to the invention, FIG. 2 shows a schematic top view of a drawing frame drawing frame according to the invention, Figure 3 shows a detailed view of the components of the stretching device according to the invention, Figure 4 shows a detail view of another embodiment of the components of the pulling device, and Figure 5 shows a detail view of a third embodiment of the components of the stretching device.

1‧‧‧Draw frame

2‧‧‧Pulling device

3‧‧‧Machine shell

4‧‧‧Bracket

5‧‧‧bearing profiles

8‧‧‧Feeding container

9‧‧‧first side

10‧‧‧second side

11‧‧‧Synchronous components

13‧‧‧Component

15‧‧‧Driver

16‧‧‧Bearing

17‧‧‧Loading roller

Claims (11)

A pulling device, a pulling device (2) for a plurality of fiber strips (7) from a feed container (8), with a support (4) and in the direction of transport of said fiber strips (7) ( 6) An upwardly extending load-bearing profile (5) having a first side (9) and a second side (10), wherein the load-bearing profile (5) is arranged on both sides (9, 10) A plurality of cylindrical, rotatably mounted synchronizing elements (11) about their longitudinal axes are configured to convey at least one fiber strip (7) in each case in the conveying direction (6) during their rotation, which is characterized in that each two opposing synchronizing elements (11) are sections of a single continuous outer face (12) of a component (13) which is continuous and It is frictionally connected with the drive belt (14). According to the pulling device (2) described in item 1 of the patent scope of the application, wherein, the member (13) is a roller. According to the pulling device (2) described in item 1 or 2 of the aforementioned patent scope, wherein, the member (13) is connected with the load-bearing profile (5) through at least one bearing (16), wherein at least The connection between a bearing (16) and said member (13) is preferably established by press fit. The pulling device (2) according to claim 1 or 2 of the aforementioned claims, wherein the member (13) is at least partially made of stainless steel, chrome-plated steel or aluminum, preferably with an electrically conductive coating. According to the pulling device (2) described in item 1 or 2 of the aforementioned patent scope, wherein the pulling device (2) has at least one driver (15) connected to the driving belt (14). The pulling device (2) according to claim 1 or 2 of the aforementioned claims, wherein the outer face (12) of the member (13) has a first guide area (20) for guiding the drive belt (14). The pulling device (2) according to claim 6 of the aforementioned patent claims, wherein the outer surface (12) of the component (13) additionally has a second guide area (21), wherein the component (13) The diameter (D2) in the first guide area (20) is different from the diameter (D3) of the member (13) in the second guide area (21). According to the pulling device (2) described in item 7 of the aforementioned patent scope, wherein, the member (13) has a plane of symmetry (22) perpendicular to its longitudinal axis, wherein the first guiding area (20) and The second guide area (21) is arranged beside the axis of symmetry (22). According to the pulling device (2) described in item 1 or 2 of the aforementioned patent scope, wherein, the pulling device (2) has at least one load roller (17) for each of the members (13), the load The rollers are connected to the outer face (12) of the component (13) in contact areas (18, 19). According to the pulling device (2) according to item 9 of the aforementioned patent scope, wherein, the diameter (D4, D5) of the member (13) in the contact area (18, 19) is the same as that in the contact area (18, 19). The component diameters (D1) outside the regions (18, 19) are different. A spinning preparation machine, preferably in the form of a draw frame (1), with a drawing device (2), characterized in that the drawing device (2) is configured from items 1 to 10 of the aforementioned patent scope structure.

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