EP1848847A1

EP1848847A1 - Top cylinder carrier for drafting systems in spinning machines.

Info

Publication number: EP1848847A1
Application number: EP05807852A
Authority: EP
Inventors: Josef Winter
Original assignee: Accotex Texparts GmbH
Current assignee: Saurer Spinning Solutions GmbH and Co KG
Priority date: 2005-02-05
Filing date: 2005-11-09
Publication date: 2007-10-31
Anticipated expiration: 2025-11-09
Also published as: DE102005005382A1; US20080040894A1; CN100540770C; WO2006081852A1; CN101115871A; ES2364758T3; US7624563B2; EP1848847B1; JP4691111B2; JP2008528824A

Abstract

The invention relates to a top cylinder carrier (1) for drafting systems in spinning machines, comprising at least one pair of feeding cylinders, one pair of apron cylinders and one pair of output cylinders and top cylinder holding devices, wherein the top cylinders are mounted in such a manner that they are rotatable on the ends of axes (5, 6) which are centrally supported between the top cylinders, respectively. A common holding device (2) is provided for the axis (5) of the output cylinders (8) and for the axis (6) of the apron cylinders (7) and is movably connectable to the top cylinder carrier (1), wherein said axes (5, 6) are mutually offset at a fixed distance therebetween.

Description

Description:

Top roller carrier for drafting systems on spinning machines

The invention relates to a top roll carrier for drafting systems on spinning machines according to the preamble of claim 1.

Oberwalzenträger are commonly used as a support and loading arm for upper roller pairs and with respect to the machine-mounted lower rollers withdrawn.

In drafting systems, it is known to make an adaptation to the fiber material or the staple length of the fiber material required for textile technological reasons and to change the distance between the clamping lines formed by the roller pairs of the drafting system. This distance is also called field width. It is known to form the Oberwalzenträger for field width adjustment so that the distances between the upper rollers are adjustable. DE 43 35 889 C2, for example, shows a top roller carrier for drafting of spinning machines, in which the top rollers are mounted in holders of slides. The slides are in each case in the longitudinal direction of the Oberwalzenträgers separately adjustable for field width adjustment. The Riemchenwalze is assigned a holder for Oberriemchen. In Oberwalzenträger an elastic hollow body is formed, which is pneumatically or alternatively hydraulically pressurized. The pressure acts on tappets via a bottom plate of the hollow body and acts on both the input and output rollers as well as the apron roller and the upper apron holder with a force which presses against the lower rollers and causes the upper rollers to act as pressure rollers. The German Utility Model G 92 14 598 Ul describes a Oberriemchenhalter for spinning machine drafting with a Riemchenführer, which deflects the Oberriemchen and tensioned under the pressure of a spring. The strap guide is held on a center piece of the upper strap holder.

From the generic DE 38 37 667 Al a load carrier for drafting of spinning machines is known, in which the axes of the upper rollers are respectively mounted in brackets which are independently displaceable in longitudinal guides of the Oberwalzenträgers for field width adjustment. The drafting system is a three-roll drafting system, in which the top rollers are designed as Druckwalzenzwillinge. The pressure on the top rollers is applied by the holders acting as a spring element due to their shape. The brackets are not designed to vary the pressure force.

The brackets of the known Oberwalzenträger, as described in the aforementioned publications, have the common drawback that they require a large number of items and require time-consuming and error-prone field width settings for Riemchen- and exit roller.

The CH 656 647 A5 shows a Riemchenstreckwerk, which is used on a spinning machine and having three each consisting of upper and lower rollers roller pairs. The top rollers are supported in the top roller carrier, which is arranged pivotable about a pivot pin to the machine stand. The box-shaped ^'trained top roller carrier contains a guide arrangement for the top roller carrying pins. To this engage in their length mid-range spring-loaded hold-down with which for all pairs of rollers about the same Spaltandruckkraft to be achieved. The Oberwalzentragzapfen are guided in guide slots of Oberwalzenträgers. The ever-occurring game between top rollers and leading edges precludes a precise adjustment of the terminal point and leads to wear problems. The distance between the upper rollers with each other in the longitudinal direction of the Oberwalzenträgers is not changeable for this reason. An adjustment of the field widths, as it is necessary when adapting to the respective fiber material to be processed, is not possible.

Both GB 691615 and OS 3256570 show three-roll drafting systems for spinning machines in which the top roll carrier has slots spaced apart from one another in the longitudinal direction of the top roll carrier for guiding the top roll center pins and the axes of top rolls, respectively.

The GB 691615 it can be seen that for a change in the distance of the top roll carrier guided top rollers of the existing top roll carrier must be replaced with a top roll carrier, in which the arrangement or the distance of the slots deviates correspondingly to the changed requirements. For an exemplary cotton-to-viscose fiber material change, the provision of two or three alternatively usable or replaceable top roll carriers is said to be sufficient. Such an exchange of Oberwalzenträgers including removal and installation of the top rollers is very expensive. - A -

In the drafting system of US 3256570, all three top rollers are each supported at their axle ends by a frame-like top roller carrier. The guides of the Oberwalzentragzapfen are as well as the Riemchenstreckwerk the CH 656 647 A5 tainted and particularly susceptible to wear due to the co-rotating with the upper roller Oberwalzentragzapfen. US 3256570 describes how the pivoting of the top roll carrier can be facilitated with magnetically supported top rolls and gives no indication as to how the distances of the top rolls could be changed. Even with the drafting system of US 3256570 this is only possible by means of a very complex replacement of Oberwalzenträgers.

It is an object of the invention to improve the known Oberwalzenträger.

The object is achieved by means of a Oberwalzenträgers with the features of claim 1.

Advantageous embodiments of the Oberwalzenträgers are the subject of the dependent claims.

The holding device according to the invention, which is movably connected to the upper roll carrier, unites the axle holders for the delivery roller and the apron roller in one component. The position of the axle receptacles in the holding device and thus the position of the axes of the output roller and the apron roller to each other can be produced with high manufacturing accuracy. In this way, an extremely accurate positioning of the clamping points of Riemchenwalze and exit roller to achieve and maintain. The parallelism of the delivery roller and apron roller is always guaranteed. On the addition of usual safety distances can be waived. Such usual safety distances are taken into account, for example, when setting the desired field width, because the achievable accuracy in the field width adjustment can only be insufficient. Manufacturing and assembly inaccuracies, which can add up in multi-part mounts, allow an inclination of the top rollers, which adversely affects the setting of the field widths. This should counteract surcharges in the form of safety distances. The holding device according to the invention reduces the number of components for the holding device compared to conventional holding devices. In order to be able to act on the holding device with a force in the direction of the counter rolls, only a single common device, for example a spring device, is necessary. The application of force to the delivery roller and apron roller can be done separately from other top rollers such as the input roller. The cost incurred in a change in the significant field width adjustment between Riemchenwalze and input roller effort is low. The required effort in ^' production and assembly is reduced because fewer and simpler parts are needed.

Advantageously, the holding device comprises a top apron deflecting device, wherein the top apron deflecting device is designed as a wing, which terminates at the free end with a deflection edge. This further reduces the number of components on the top roll carrier. The orientation of the top apron deflector to the apron roller is very precise and can not be adversely affected by the effect of assembly tolerances or the summation of manufacturing tolerances of multiple components. The deflection can not be due to poor setting or heavy deformable fiber materials are deflected from the parallel alignment. Such a deflection would disadvantageously lead to number fluctuations or even to axially running straps. The opening size remains the same.

If the deflecting edge is designed as a chromed metal rail and the metal rail is attached to the wing, only little friction occurs during the deflection process, and the deflecting edge is subjected to only minimal wear. Due to the low-friction deflection edge, the loop slip is minimized.

Maintenance intervals can be extended. The apron roller only needs to be removed rarely or not at all.

Preferably, the holding device is assigned a Riemchenspanner, which is aligned axially parallel to the upper rollers and movable relative to the holding device. This design allows easy flexible tensioning of the top aprons. An excellent Riemchengleichlauf is guaranteed.

With a holding device which has a head part, and in which by means of the head part by a force acting from above on the upper roller formed as a Riemchenwalzen and output rollers, a load pressure can be exercised, the required contact force can be easily applied. If the head part is designed as a separate component which can be displaced longitudinally relative to the holding device, the distribution of the compressive force on the apron roller and the output roller can be changed.

Both a head part, which is designed as a pressure plate, over which an elastic hollow body is arranged, and wherein with Help the hollow body which is sufficient to generate the load pressure force pneumatically or hydraulically generated, as well as a head over the Oberwalzenträger a spring is arranged, by means of which the head part is acted upon with the force, allow a metered pressurization of the output roller and the Riemchenwalze with a compressive force. With even pressure distribution through the uninterrupted pressure plate, the wear can be reduced, the service life increased and the maintenance intervals can be extended. For the application of the load pressure on the output roller and Riemchenwalze only a single device is required for both rolls. A common adjustable force application of the output roller and Riemchenwalze separately from other top rollers as the input roller is possible.

A holding device made of plastic can be produced particularly inexpensively, has little weight, is resistant to corrosion and meets the elasticity requirements imposed on the holding device. Polyoxymethylene, referred to as POM, is characterized by high hardness, stiffness and toughness and is particularly well suited for this application. If the plastic is electrically conductive, an uncomplicated dissipation of electrostatic charges is ensured. This avoids interference caused by electrostatic charge during spinning operation.

Time-consuming and error-prone field width adjustment methods for apron and outfeed rollers are eliminated. Only one simple setting is required for the input roller. Further details of the invention are explained below with reference to FIGS.

Show it:

Fig. 1 is a simplified partial representation of a

Oberwalzenträgers with a holding device in side view, partly in section,

2 shows the holding device of FIG. 1 in the view A-A, partly in section,

3 is a plan view of the Oberriemchen-ümlenkeinrichtung the holding device of FIG. 1 in the view I-I, partially in section,

4 shows a deflection edge of the Oberriemchen-deflection device with metal rail, in side view,

4A a deflection edge of Oberriemchen-deflection device with the metal rail in an alternative position, in side view,

5 shows the simplified partial representation of a

Oberwalzenträgers with a spring-loaded holding device in side view, partially in section,

In Fig. 1, a part of a Oberwalzenträgers 1 is shown, which carries a holding device 2. Such Oberwalzenträger be used on drafting of spinning machines. The holding device 2 has Ächsaufnahmen 3, 4 for the axes 5, 6 of the Riemchenwalzenpaares and the output roller pair on. The position of the Riemchenwalzenpaares and the output roller pair is in each case indicated by a Riemchenwalze 7 and an output roller 8. Both axle mounts 3, 4 are part of the one-piece holding device 2. The holding device 2 consists of the elastic plastic POM. Due to the elasticity, the axles 5, 6 can be easily pressed into the axle receptacles 3, 4 during assembly. The axes 5, 6 are held securely in the snap connection. Riemchenwalzenpaar and pair of output rollers together with the inlet roller pair, not shown in Fig. 1, the upper rollers of the drafting system. The associated ünterwalzen 9, 10 are positioned so that their axes of rotation 11, 12 to the rotation axes 13, 14 of the output roller 8 and the Riemchenwalze 7 are offset. The axis of rotation 11 of the lower roller 9 is not perpendicular in the illustration of FIG. 1 below the axis of rotation 13 of the output roller 8, but slightly offset to the right. On the other hand, the axis of rotation 12 of the lower roller 10 is offset somewhat to the left towards the axis of rotation 14 of the apron roller 7. If the Riemchenwalze 7 and the output roller 8 is pressurized and pressed against the lower rollers 9, 10, horizontal force components occur. The horizontal force component acting on the output roller 8 is directed to the left in the illustration of FIG. 1 and is referred to as a curtain force. The horizontal force component acting on the Riemchenwalze 7 is directed to the right in the illustration of FIG. 1 and is referred to as a return force. Curtaining force and return force in the illustrated embodiment of FIG. 1 are substantially the same, so that only a small or no horizontal force component acts on the holding device 2. This is an almost frictionless coupling associated with the Oberwalzenträger 1 holding device 2 to the Oberwalzenträger 1 given. It turns a stable position of the Riemchenwalze 7 and the output roller 8 to the lower rollers 9, 10 a.

The pressurization of the apron roller 7 and the output roller 8 is pneumatically. On the holding device 2 designed as a pressure plate 15 head portion is arranged, on which the bottom plate 16 of an elastic hollow body 17 rests. By applying the hollow body 17 with compressed air, the holding device 2 is pressed down, the pressure on the Riemchenwalze 7 and the output roller 8 transmitted and the Riemchenwalze 7 and the output roller 8 on the ünterwalzen 9, 10 pressed. The pressure plate 15 is displaceable relative to the holding device 2 in the longitudinal direction of the Oberwalzenträgers 1. If the pressure plate 15 is moved to the left in the illustration of FIG. 1, the pressure on the output roller 8 increases, and the pressure on the Riemchenwalze 7 is lower. When the pressure plate 15 is shifted to the right, the pressure on the output roller 8 decreases, and the pressure on the apron roller 7 becomes larger. In this way, the pressure distribution on the Riemchenwalze 7 and the output roller 8 can be made variable.

The holding device 2 has a slot 18, the edges 19, 20 each extend on the radius R _TR , which is struck around the pivot point of the Oberwalzenträgers 1. In the slot 18, a hollow bolt 21 is guided, which is connected by means of screws 22 fixed to the Oberwalzenträger 1 ^' is. Due to the interaction of elongated hole 18 and hollow pin 21, the holding device 2, regardless of the altitude, which occupies the Oberwalzenträger 1, be positioned. Of the Metallic hollow pin 21 stiffens the U-shaped, downwardly open body of the Oberwalzenträgers first

To the axle receptacles 3, 4, the holding device 2 has a designed as a wing 23 Oberriemchen deflection device over which the Oberriemchen 24 is guided. The free end of the blade 23 has a distance R from the axis of rotation 14 of the apron roller 7. The distance R is, for example, in an embodiment for the processing of short staple fiber material 35 mm. The free end forms the deflection edge 25 for the two Oberriemchen 24, 26 of the Riemchenwalzenpaares. The width of the blade 23 is tuned to the largest required spindle pitch. In the effective direction of the force by which the top aprons 24, 26 are tensioned, the wing 23 is very stiff. In the vertical direction, the deflecting edge 25 can be moved at the free end of the wing 23 without much effort. Thus, the opening dimension X can be easily adjusted for the required jaw widths. The shape of the wing 23 can be seen in Figures 2 and 3. The position of the over-crotch 2-6-is-tn-Fig- ^• 2-ges-teeieheit is indicated. The wing 23 carries a nose 27, on which a piston 28 applies a bearing force. The bearing force is given to the piston 28 of the bottom plate 16. The piston 18 is movably guided in a bore 29 of the holding device 2.

4 shows an alternative embodiment to the wing 23 shown in FIGS. 1-3. The wing 30 has a receptacle 31 for a chromed interchangeable metal rail 32. The receptacle 31 is designed such that the metal rail 32 is alternatively positionable in two different positions. Fig. 4 shows a first position of the metal rail 32, in which the distance Ri of the axis of rotation 14 of the Riemchenwalze 7 results. Fig. 4A shows a second position of the metal rail 32, in which the distance R ₂ results. The distance R ₂ is smaller than the distance Ri. Due to the possibility of exchanging the metal rail 32, the position of the deflection edge 25 can be adapted to the respective production conditions by suitably selecting the metal rail 32 and / or by selecting the position of the metal rail 32 optimal spinning geometry is ensured. The position of the Umlenkkante.25 can be selected so that a sufficient distance between the output roller 8 and Oberriemchen 24 is ensured. A quality-affecting strip of Oberriemchens 24 on the output roller 8 is reliably avoided. The chromed metal rail 32 is particularly resistant to wear and causes a low-friction deflection of the. Upper apron 24, 26. Slip slip and wear of top aprons 24, 26 is reduced.

The holding device 2 has between the wing 23 and the axle 3 a vertically oriented and downwardly open slot 33. The slot 33 serves as a ^' guide slot for the support shaft 34 of a Riemchenspanners 35. On the support axis 34 is on both sides depending on a guide element 36, 37 attached as shown in Fig. 2. The guide members 36, 37 hold the top aprons 24, 26 in the desired position and prevent their axial displacement. The gap 38 between the wing 23 and underside of the holding device 2 is slightly smaller than the diameter of the support shaft 34. When installing the support shaft 34 of the wing 23 is deflected due to its elasticity and the support shaft 34 can be easily pressed into the slot 33. Falling out of the support shaft 34 from the holding device 2 is prevented in this way. A spring element 39 presses from below against the carrier axis 34. The top aprons 24, 26 are tensioned by means of the carrier axis 34 with a selectable force. The position of the tensioned Oberriemchens 26 is indicated by dashed lines in the illustration of FIG. The top apron 24 assumes a corresponding mirror-image position on the left side of the holding device 2, but is not shown in FIG. Also not shown in FIG. 2 are the upper rollers and the lower rollers, including axles.

The holding device 2 has on each side of a nub 66, with which the holding device 2 is held in the top roll carrier 1.

5 shows a top roll carrier 40 with a holding device 41 which is acted upon by a spring force in order to produce the pressure of the apron roll 42 and the output roll 43 required for the spinning process on the bottom rolls 44, 45. In Fig. 5, the bearings of the lower rollers 44, 45, 46 and formed as inlet rollers 47 upper rollers are not shown for reasons of simplification. The axle receptacle 49 supports the axis 51 of the output roller 43. The curtain force of the output roller 43 and the rearward force of the apron roller 42 are substantially equalized in the embodiment of FIG. 5, so that on the holding device 41 only a small or no horizontal force component acts, as is the case with the holding device 2 shown in FIG. 1. On the holding device 41 designed as a pressure plate 52 headboard is arranged. The Pressure plate 52 is made of steel. The pressure plate 52 is suitable both for holding devices for the processing of short staple fiber material and for holding devices which are to be used for the processing of medium or long staple fiber material. The holding devices are easy and quick to replace. By means of a snap connection and a bolt 53, the pressure plate 52 and attached to it holding device 41 is pivotally connected to a pressure tab 54. The pressure flap 54 is pivotable about a pivot axis 55 fixedly connected to the top roll carrier 40. The compression spring 56 is supported on the one hand on a transverse pin 57 of the pressure plate 54 and on the other hand on a support plate 58 from. The support plate 58 abuts against an eccentric element 59. The eccentric element 59 is rotatably mounted on a rotation axis 60. The rotation axis 60 is fixedly connected to the top roll carrier 40. By means of rotation of the eccentric element 59, the force is adjustable with which the compression spring 56 acts on the pressure flap 54 and thus on the holding device 41, the apron roller 42 and the output roller 43. The pressure flap 54 is designed so that the holding device 40 is acted upon by a largely constant force, even if the height position of the Oberwalzenträgers 40 is adjusted within a certain range. This area can be approx. 6 mm. A compression spring 61 urges the wing 65 with a certain downward force. The vane 65 serves to deflect the upper apron 62 of the Riemchenwalze 42 and the other upper apron and the associated other Riemchenwalze, both of which are not shown in Fig. 5, and with the Oberriemchen 62 and Riemchenwalze 42 in each case form a pair. For tensioning the Oberriemchens 62 and arranged in mirror image Oberriemchens serves a Riemchenspanner 63, as shown in Fig. 1, 2 or 4. The strap tensioner 63 is moved up and down in the slot 64 and is pressed by an unillustrated spring element upwards.

By means of the lever 67, the operating position of the Oberwalzenträgers 40 shown in Fig. 5 is secured.

The holding devices each designed for the processing of kurzstapeligem, mittelstapeligem or langstapeligem fiber material can be easily and simply replaced.

The Riemchenführer can be easily rotatable, whereby the loop slip can be further reduced.

In the context of the invention, further embodiments of Oberwalzenträgern are possible. For example, instead of the wings 23, 30, 65 shown in the figures, which form an integral part with the holding device 2, 41, a wing is used, which is designed as a separate part and is attached to the holding device 2, 41.

Claims

Claims:

1. Oberwalzenträger for drafting on spinning machines with at least one pair of input rollers, a Riemchenwalzenpaar and a pair of output rollers as top rollers and holding devices for the top rollers, the top rollers rotatably mounted on the ends of axes and the axes are each mounted centrally between the top rollers,

characterized,

in that for the axis (5, 51) of the output rollers (8, 43) and the axis (6, 50) of the apron rollers (7, 42) there is provided a common holding device (2, 41) connected to the top roller carrier (1, 40 ) is movably connected and fixed the two axes (5, 51, 6, 50) at a fixed distance from each other.

2. Oberwalzenträger according to claim 1, characterized in that the holding device (2, 41) comprises a Oberriemchen- deflection device.

3. Oberwalzenträger according to claim 2, characterized in that the Oberriemchen deflection device as a wing (23, 30, 65) is formed and at the free end with a deflection edge (25) terminates.

4. Oberwalzenträger according to claim 3, characterized in that the deflection edge (25) is designed as a chromed metal rail (32) and that the metal rail (32) on

Wing (30) is fixed, wherein the metal rail (32) is alternatively positionable in at least two positions.

5. Oberwalzenträger according to any one of the preceding claims, characterized in that the holding device (2, 41) is associated with a rotationally symmetrical shaped Riemchenspanner (35, 63) aligned axially parallel to the upper rollers (7, 8, 42, 43, 47) and relative to

Holding device (2, 41) is movable under tension.

6. Oberwalzenträger according to any one of the preceding claims, characterized in that the holding device (2, 41) has a head part and that by means of the head part by a force acting from above on the upper roller formed as apron rollers (7, 42) and output rollers (8, 43) a load pressure is exercisable.

7. Oberwalzenträger according to claim 6, characterized in that the head part is formed as a separate relative to the holding device (2, 41) longitudinally displaceable component.

8. Oberwalzenträger according to one of claims 6 or 7, characterized in that an elastic hollow body (17) over the pressure plate (15) formed head portion is arranged and that with the aid of the hollow body (17) the force is pneumatically or hydraulically generated.

9. Oberwalzenträger according to any one of claims 6 or 7, characterized in that a spring (56) over the head part in the Oberwalzenträger (40) is arranged, by means of the

Headboard with the force can be acted upon.

10. Oberwalzenträger according to any one of the preceding claims, characterized in that the holding device (2, 41) made of plastic, preferably made of polyoxymethylene.

11. Oberwalzenträger according to claim 10, characterized in that the plastic is electrically conductive.

12. Oberwalzenträger according to claim 1, characterized in that the distance between the Riemchenwalze (7, 42) and the input roller (47) is adjustable.