EP3095898B1 - Loading arm of top rollers of a drafting system - Google Patents

Description

The present invention relates to a load carrier for top rollers of a drafting system of a spinning machine, wherein the top rollers form an input roller, a center roller and an output roller of the drafting system, with a guide rail and at least one about an axis of rotation in the guide rail rotatably mounted bridge on the at least one of the top rollers wherein the drafting device is mounted and wherein at the bridge a drive means is arranged, in which the upper exit roller of the drafting arrangement and a pinch roller of a compression device are arranged and drivingly connected to each other and wherein the guide rail and / or the bridge have at least one opening in which received the axis of rotation is and the upper exit roller is arranged by means of a loading unit to the bridge.

Generic load carrier for top rollers of a drafting system of a spinning machine are well known. They are used in particular in ring spinning machines, in which a fiber strand is stretched and then spun into a thread. Particularly high-quality spinning machines of this type have an additional compression device, which is arranged following the drafting system and in front of the actual spinning device and compresses the drawn fibers. This creates a compact yarn which has a higher quality. Known compaction equipment, as used for example in the DE 100 08 130 A1 are disclosed have a pinch roller which presses the stretched sliver on a suction device. This pinch roller is driven by a gear on the output roller of the drafting system. The drive device has in a housing on the transmission, the output roller and the pinch roller and is sold, for example, under the product name EliTop. The drive device is rotatable about the Outgoing roller stored. When the load carrier is closed, that is, when the upper rollers are pressed onto the associated lower rollers of the drafting system, the output roller is also pressed onto the output lower roller. By appropriate springs while the pinch roller is pressed onto the suction device. The disadvantage here is that the pressure of the loading arm, which is directed to the topmost roll, must be split between the topmost roll and the pinch roll. As a result, in some applications unfavorable pressure conditions, which lead to a non-optimal spin result.

Object of the present invention is to provide a load carrier and an associated compression spring with which the pressure of the pinch roller can be optimally obtained on a suction device.

The object is solved with the features of the independent claim.

The invention relates to a load carrier for top rollers of a drafting system of a spinning machine, wherein the top rollers form an input roller, a center roller and an output roller of the drafting system. Depending on the type of drafting system further center rollers may possibly be present. The load carrier is part of the drafting system and responsible for the fact that the upper rollers rest on the lower rollers of the drafting system assigned to them and these are pressed with a defined force. This force is required to ensure a proper stretching of the introduced into the drafting fiber structure.

The load carrier has a guide rail and at least one bridge rotatably mounted about an axis of rotation in the guide rail. At least one of the upper rollers of the drafting system is attached to the bridge. Furthermore, a drive device is arranged on the bridge, in which the upper exit roller of the drafting system and a pinch roller of a compression device arranged and drivingly connected to each other. The pinch roller of the compacting device presses the fiber bundle coming from the delivery roller of the drafting system against the compacting device, which usually can work pneumatically or else mechanically, and clamps the compacted fiber bundle, which is subsequently fed to a spinner device. The drive of the pinch roller is usually done by means of a belt or gear drive, which are connected to the rotating upper exit roller of the drafting system. The guide rail and / or the bridge have at least one opening in which the axis of rotation is received. The bridge is thus able to oscillate within the guide rail and exert a predetermined pressure on the upper rollers and the upper rollers on the lower rollers. The axis of rotation can go continuously through two openings in the guide rail and bridge or fixed to one of the two components, for example, be arranged as stub axle.

At least the upper exit roller is arranged in particular by means of a loading unit to the bridge. The loading unit is usually designed such that it holds the top exit roller to the bridge and on the other hand, pressure from the guide rail or the load carrier can be applied to the top exit roller. The top rollers can also be attached directly to the load carrier. According to the clamping roller is loaded in its working position by means of a compression spring and the compression spring is arranged in the opening of the guide rail and / or the opening of the bridge, preferably on the axis of rotation. If the compression spring is fixed in one of the openings, an individual adaptation of the spring pressure to the loading unit is obtained by means of an altered lever arm. By attaching the compression spring to the axis of rotation of one of the bridges, a particularly simple mounting option for the spring is provided.

By the compression spring according to the invention ensures that the pinch roller can be pressed largely independent of the output roller on the elements of the compression device, such as a suction pipe. The pressure of the pinch roller can thus be selected depending on the arrangement or strength of the compression spring, without significantly affecting the pressure of the output roller. Due to the arrangement of the compression spring in the opening of the guide rail and / or bridge or on the axis of rotation of the bridge retrofitting in existing load carriers is very easy. The existing openings of the guide rail and / or bridge or the already existing rotation axis for the bridge can be used to arrange the compression spring there and apply a largely independent of the output roller pressing force on the pinch roller. The load carrier with the output roller and pinch roller having drive device is thus very easy to improve and a much better and more uniform fiber composite is thus achieved. This allows a more uniform and stronger thread to be spun. In addition, it is very easy to replace the compression spring and the loading unit. If the load unit only abuts against the spring, it can be removed from its attachment to the bridge, regardless of the spring. The compression spring is removed for replacement or for a change of their pressure force from their storage in a first opening and fixed again in another opening.

It is particularly advantageous if the compression spring is supported on the guide rail. As a result, a defined travel is achieved and the pressure force on the pinch roller can be obtained in a predetermined manner. The lever arm of the compression spring extends from the support point on the guide rail to the contact point of the compression spring on the housing of the drive device and can be independent of the attachment of the compression spring in the opening of the guide rail and / or bridge or the axis of rotation. Since usually the support point of the compression spring on the guide rail between the opening or the axis of rotation and the contact point of the compression spring on the housing of the drive device, a more or less rigid compression spring can be obtained thereby.

If two bridges are advantageously arranged on the guide rail, the upper input roller and the second bridge being arranged on the first bridge and the upper center roller and the upper output roller being arranged on the second bridge with the drive device, a pendulum mechanism is obtained with which the drive forces of the individual upper rollers are obtained whose bottom rollers can be set very targeted. The two bridges are rotatable with respect to each other and with respect to the guide rail. As a result, the top rollers are optimally adapted to the bottom rollers and the pressure forces are applied in a particularly uniform and targeted manner.

If, in a particularly preferred embodiment, the first bridge is rotatably arranged in the guide rail by means of a first axis of rotation and the second bridge is rotatably arranged on the first bridge by means of a second axis of rotation, this likewise serves to optimally equalize the pressure of the upper rollers on the lower rollers.

If the first bridge and the second bridge advantageously have a plurality of openings for receiving their axis of rotation, then the individual lever arms can be adjusted thereby and the force distribution is optimally adjusted depending on the application and the fiber material to be processed.

If the compression spring is advantageously arranged on the first axis of rotation or one of the free openings of the first bridge not currently required by the axis of rotation, then this is directly connected to the guide rail and can thus produce a targeted and uniform force on the drive device or its housing and thus apply to the pinch roller.

If the drive device is arranged to be rotatable about the top exit roller, this also ensures in a particularly advantageous manner that a simple and proven attachment of the drive device is used and yet the load on the pinch roller can be largely independent of the top exit roller.

In order to limit the rotation of the drive device to the upper exit roller, a stopper is preferably arranged on the drive device and / or the loading unit. This prevents that the drive device in the unloaded state unhindered about its axis of rotation, i. usually around the top exit roller commutes and thus would have to be adjusted when closing the load carrier only. By the stopper ensures that the load carrier can be closed without further handling of the drive device and thus both the upper exit roller and the pinch roller automatically comes to rest at the right place.

If top rollers and pinch rollers for two parallel drafting arrangements are arranged on the load carrier, then a load carrier known per se can advantageously be equipped with the present invention. The load carrier carries twin rolls, these rolls are connected to an axis and the axis is held in the guide rail directly or indirectly. The corresponding upper rollers are then exposed laterally of the guide rail and cooperate there with their associated lower rollers of the adjacent drafting systems.

In a particularly advantageous embodiment, the compression spring is designed as a leaf spring. This leaf spring is strong enough that it can press the pinch roller on the compression device, in particular the suction tube. It is also easy to install and position due to its wide and flat shape.

A corresponding compression spring for a load carrier, as described above, has a receptacle for attachment in a guide rail and a pressure surface for loading a pinch roller in its working position. According to the invention, the compression spring has a stop surface in order to support itself in its working position on the guide rail of the load carrier. This stop surface has the advantage that the length between the stop surface on the guide rail and the contact point of the compression spring is defined on the housing of the drive device. In this way, a defined force can be selectively applied to the drive device and thus the pinch roller. Regardless of the attachment point of the guide rail thus a sufficiently high Drucckraft is achieved.

The compression spring is advantageously designed according to the foregoing description of the load carrier, said features may be present individually or in any combination.

Preferably, the compression spring between its stop surface and its pressure surface is bent. This ensures a better positioning and stabilization of the compression spring in the guide rail.

If the receptacle is an eyelet, it is possible in a particularly advantageous manner for the compression spring to be arranged in one of the axes of rotation of the load carrier, in particular the axis of rotation anchored in the guide rail. The axis of rotation is threaded through the eyelet and fixed in the openings of the guide rail or the bridge. As a result, the compression spring is secured correspondingly advantageous.

It is particularly advantageous if the stop surface is arranged between the receptacle of the compression spring and the pressure surface of the compression spring. Thus, the force of the compression spring on the pinch roller is determined geometrically by the distance between the stop surface and the pressure surface.

Figur 1

einen vertikalen Längsschnitt durch einen erfindungsgemäßen Belastungsträger und

Figur 2

eine horizontalen Längsschnitt durch den Belastungsträger der Figur 1.

Further advantages of the invention are described in the following exemplary embodiments. It shows:

FIG. 1

a vertical longitudinal section through a load carrier according to the invention and

FIG. 2

a horizontal longitudinal section through the load carrier of FIG. 1 ,

In FIG. 1 is a longitudinal section through a load carrier 1 according to the invention outlined. The load carrier 1 has a guide rail 2, a first bridge 3 and a second bridge 4. The first bridge 3 is rotatably arranged on the guide rail 2 by means of a rotation axis 5. The axis of rotation 5 is fixed in one of three openings 6 and thus causes a rotatable mounting of the first bridge 3 in the guide rail 2. The second bridge 4 is rotatably connected to a further axis of rotation 7 in one of three openings 8 with the first bridge 3 , The openings 6 and 8 are preferably arranged correspondingly in the first bridge 3 and the guide rail 2 or in the second bridge 4 and the first bridge 3, about the rotation axis 5 or the rotation axis 7 as connection of the first bridge 3 with the guide rail 2 or the second bridge 4 with the first bridge 3 to effect. Depending on the positioning of the axes of rotation 5 and 7, other lever arms and thus other pressure forces of the load carrier 1 can be effected on the upper rollers arranged thereon.

The top rollers are shown in the present load carrier 1 as the upper input roller 9, upper center roller 10 and upper exit roller 11. The upper input roller 9 is fastened to the first bridge 3 by means of a holder 12. The upper center roller 10, which is looped by a strap 13, is fastened to the second bridge 4 by means of a holder 14. Likewise, the upper exit roller 11 is attached by means of a holder 15 to the second bridge 4. Between the second bridge 4 and the. Upper exit roller 11, a loading unit 16 is arranged, which causes a force transmission from the second bridge 4 on the upper exit roller 11. Also for loading the upper input roller 9 and the upper center roller 10 can be arranged in a similar manner, not shown here, a loading unit.

The upper exit roller 11 is arranged together with a pinch roller 17 in a drive device 18. The pinch roller 17 is drivingly connected via a gear, not shown, with the upper exit roller 11. The gear causes according to the intended gear ratio upon rotation of the pinch roller 17, a corresponding rotation of the upper exit roller 11. The pinch roller 17 is intended to be pressed on a compression device, not shown, to compress a fiber composite pneumatically or mechanically.

The drive device 18 is, as indicated by a double arrow, arranged rotatably about its axis 24 of the upper exit roller 11. Thus, the pinch roller 17 can be pressed independently of the upper exit roller 11 on the compression device. In order to prevent unintentional further rotation of the pinch roller 17 about the upper exit roller 11, a stopper 19 is provided on the drive means 18. The stopper 19 strikes in the embodiment shown here, for example, on the holder 15, when the rotation of the drive means 18 and the pinch roller 17 to the upper exit roller 11 is too far. As a result, on the one hand, the system of the pinch roller 17 is provided on the compression device. On the other hand can When opening the load carrier 1, that is at a lifting of the top rollers of the associated lower rollers, too much rotation of the drive means 18 are avoided to the top exit roller 11, whereby at a renewed delivery of the load carrier 1 to the lower rollers of the drafting accurate positioning Pinch roller 17 is made possible in the region of the compression device.

At the rotational axis 5, which connects the first bridge 3 with the guide rail 2, a compression spring 20 is arranged. The compression spring 20 has at its first end an eyelet 21, through which the axis of rotation 5 is threaded. This eyelet 21 causes a rotatable reception of the compression spring 20. The other end of the compression spring 20 has a pressure surface 22. The pressure surface 22 presses the drive device 18 and thus the pinch roller 17 downwards, that is in the direction of the compression device. The compression spring 20 acts thereby an elastic force on the pinch roller 17 and on the compression device. As a result, a predetermined contact pressure of the fiber composite is effected on the compression device.

The compression spring 20 also has a stop surface 23. The stop surface 23 is supported by compression spring 20 on the guide rail 2. As a result, a defined spring force is effected on the drive device 18. Between the stop surface 23 and the pressure surface 20, it is the compression spring 20 is bent. This bend serves to stabilize the compression spring 20 and a defined application of force to the drive device 18th

By attaching the compression spring 20 in one of the openings 6 of the first bridge 3 or guide rail 2, different lever arms can be adjusted to the drive device 18. As a result, the distance of the pressure surface 22 from the rotation axis 24 on the upper exit roller 11 increases or decreases, as a result of which different forces are exerted on the drive device 18 or pinch roller 17. In a different design of the compression spring 20, it is also possible that the compression spring 20 is fixed to the axis of rotation 7 or one of the openings 8. Due to the mobility of the second bridge 4 with respect to the first bridge 3, however, it is more advantageous if the compression spring 20 is attached to the first bridge 3 or the guide rail 2, since otherwise the mobility of the two bridges could be limited.

In FIG. 2 is a horizontal section through the load carrier 1 of FIG. 1 outlined. It can be seen in particular from this illustration that the corresponding top rollers are twin rollers which can serve two drafting devices arranged parallel to one another. The load carrier 1 thus serves for the supply and the pressing of the top rollers of two parallel drafting units. On the guide rail 2, the first bridge 3 is rotatably supported by means of the axis of rotation 5. At the first bridge 3, in turn, the second bridge 4 is rotatably supported by means of the axis of rotation 7. On the rotation axis 5, the compression spring 20, which is formed as a leaf spring with a small thickness and a substantially larger width. The spring 22 is fixed in the eyelet 21 on the axis 15. The compression spring 20 presses the drive device 18 about the axis of rotation 24 of the upper exit rollers 11 in the direction of a below the pinch roller 17 compression device.

The upper input rollers 9 and 9 ', and the upper center rollers 10,10' with their straps 13,13 ', the upper exit rollers 11,11' and the pinch rollers 17,17 'are each mounted in the load carrier 1 and are common to the two parallel drafting sub-rollers delivered at a closing of the load carrier 1.

The present invention is not limited to the illustrated and described embodiments. Variations within the scope of the claims are also possible as a combination of features, even if they are shown and described in different embodiments.

LIST OF REFERENCE NUMBERS

1

Weighting Arms

2

guide rail

3

first bridge

4

second bridge

5

axis of rotation

6

openings

7

axis of rotation

8th

openings

9

Upper feed roller

10

Upper center roll

11

Upper exit roll

12

holder

13

Strappy

14

holder

15

holder

16

Physical stress

17

pinch roller

18

driving means

19

stopper

20

compression spring

21

eyelet

22

print area

23

stop surface

24

axis

Claims (13)

1. A loading arm of a drafting system of a spinning machine, with a top intake roller (9), a top middle roller (10), and a top discharge roller (11) of the drafting system and a clamping roller of a condensing device,

   - having a guide rail (2), and

   - at least one bridge (3; 4)

   - on which at least one of the top rollers of the drafting system is mounted, and

   - a drive device (18) being disposed on the bridge, in which

   ∘ the top discharge roller (11) of the drafting system and

   ∘ the clamping roller (17) of a condensing device are disposed and connected to each other for driving, and

   - the top discharge roller (11) being disposed on the bridge (3; 4) particularly by means of a load unit (16) and

   - the clamping roller (17) is loaded by means of a pressure spring (20 in the working position thereof,
   characterized in that

   - the bridge (3; 4) is rotatably supported about a rotary axis (5) disposed in the guide rail (2),

   - the guide rail (2) and/or the bridge (3; 4) comprising at least one opening (6; 8), in which the rotary axis (5; 7) is received in the guide rail (2) and

   - the pressure spring (20) is disposed in the opening (6; 8) of the guide rail (2) and/or of the bridge (3; 4), preferably on the rotary axis (5; 7).
2. The loading arm according to the preceding claim, characterized in that the pressure spring (20) is supported on the guide rail (2).
3. The loading arm according to any one or more of the preceding claims, characterized in that two bridges are disposed on the guide rail (2), wherein the top intake roller (9) and the second bridge (4) are disposed on the first bridge (3) and the top middle roller (10) and the top discharge roller (11) with the drive device (18) are disposed on the second bridge (4).
4. The loading arm according to claim 3, characterized in that the first bridge (3) is rotatably disposed in the guide rail (2) by means of a first rotary axis (5) and the second bridge (4) is rotatably disposed on the first bridge (3) by means of a second rotary axis (7).
5. The loading arm according to claim 4, characterized in that the first bridge (3) and the second bridge (4) comprise a plurality of openings (6; 8) for receiving the rotary axes (5; 7) thereof.
6. The loading arm according to claim 5, characterized in that the pressure spring (20) is disposed on the first rotary axis (5) or one of the openings (6) of the first bridge (3).
7. The loading arm according to any one or more of the preceding claims, characterized in that the drive device (18) is disposed rotatably about the top discharge roller (11).
8. The loading arm according to any one or more of the preceding claims, characterized in that a stopper (19) is disposed on the drive device (18) and/or on the loading unit (16) in order to limit the rotation of the drive device (18) about the top discharge roller (11).
9. The loading arm according to any one or more of the preceding claims, characterized in that top rollers and clamping rollers (17) for two drafting systems running in parallel are disposed on the loading arm (1).
10. The loading arm according to any one or more of the preceding claims, characterized in that the pressure spring (20) is a leaf spring.
11. The loading arm according to any one or more of the preceding claims, characterized in that the pressure spring (2) having a mount for mounting in a guide rail (2), having a pressure surface (22) for loading a clamping roller (17) in a working position thereof, as well as a contact surface (23) for supporting said spring (20) on the guide rail (2) of the loading arm (1) in the working position thereof.
12. The loading arm according to claim 11, characterized in that the pressure spring (20) is curved between the contact surface (23) and the pressure surface (22) thereof.
13. The loading arm according to claim 11, characterized in that the mount is an eye (21) in which a rotary axis (5; 7) can be disposed.

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