CN113293463A

CN113293463A - Lap guide for a combing machine

Info

Publication number: CN113293463A
Application number: CN202110196641.9A
Authority: CN
Inventors: B·林丁格; F·凯勒
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2020-02-21
Filing date: 2021-02-22
Publication date: 2021-08-24
Also published as: EP3868931A1; EP3868931B1; BR102021001433A2; CH717160A1

Abstract

The invention relates to a lap guide for a combing machine for guiding a lap (3). The lap guide device comprises a side frame (18) and a cover (24) as well as a pressure roller (8) and a lower lap inlet (14) and an upper lap inlet (10). The lower lap inlet (14) comprises a lower cover (15) and a lower lap guide (16) at a distance from the lower cover (15) in the region of the lap (3) to be guided, and the upper lap inlet (10) comprises an upper cover (11) and an upper lap guide (12) at a distance from the upper cover (11) in the region of the lap (3) to be guided, the upper lap guide (12) being connected to the lower lap guide (16) by a flexible element (17). The upper cover (11) is fastened in the lap guide independently of the upper lap guide (12) by means of a holding device, which is provided for fastening the upper cover (11) in the side frame (18) or to the cover (24) or to the pressure roller (8).

Description

Lap guide for a combing machine

Technical Field

The invention relates to a lap guide for a combing machine, for guiding a lap, comprising a side frame and a cover, as well as a pressure roller and a lower and an upper lap inlet.

Background

In combing machines comprising an automatic lap splicing (piecing) device, as known from EP 0368059 a1, the start of the lap web (lap web) from a new lap is automatically spliced to the end of the lap web from the previous lap, thus ensuring a predetermined overlap (overlap) of consistent quality of the two lap ends.

After connecting the two ends of each lap web using a lap splicing device, the lap is fed in the conveying direction to the feed drum of the combing machine by means of transport rollers via a lap guiding device, such as the one known from CN 206467357U. A common lap guide device has an upper lap entrance with an upper cover and an upper lap guide connected to a lower lap guide by a flexible element.

With regard to automatic roll splicing devices, the essential purpose of the upper cover of the upper roll entrance is to gently transfer the newly spliced rolls into the roll guides. If the upper cover of the upper lap entrance is missing, especially at high carding cycle numbers in excess of 350 KS/min, the newly spliced lap will be thrown out through the lower lap entrance and accumulate such that the lap will not reach the feed drum. This therefore results in an interruption of the operation of the combing machine.

Furthermore, conventional lap guiding devices for automatic lap splicing devices are designed such that on the one hand they guide the lap from the transport roller to the feed drum without buckling stress and on the other hand they oppose the back and forth movement of the gripper unit. To achieve this, the upper lap guide performs a dynamic movement depending on the speed of the combing machine (number of combing cycles). The movement of the lap guide is designed to prevent possible buckling stresses during transport of the lap in the lap guide. In this case, the transport of the lap from the transport roller to the feed drum by the lap guide and also the to-and-fro movement of the gripper unit act on the upper lap guide, so that no warping of the lap is caused as far as possible.

Since the known lap guide is designed such that the upper cover is connected to the upper lap guide via the locking cam and the retaining clip, the upper cover together with the upper lap guide is likewise subjected to a dynamic movement.

Newer generations of combing machines operate at higher combing cycles from 500 KS/min to 700 KS/min. This results in a high dynamic interaction between the upper lap guide and the upper cover at the point of connection of the locking cam and the retaining clip, due to the high number of combing cycles associated with the cotton to be processed and possibly heavily contaminated. This in turn leads to increased wear and associated failure of these connection points between the upper cover and the upper lap guide. Therefore, the upper cover falls into the inside of the combing machine and damages parts of the combing machine (such as the circular comb and the top comb). As a result, in the case of the known lap guide, undesirable faults at high carding cycle numbers of more than 350 KS/min were recorded, which caused considerable costs for the owner of the textile mill.

Disclosure of Invention

It is therefore an object of the present invention to provide a lap guiding device which allows reliable and trouble-free operation of the combing machine, in particular in the case of high combing cycles numbers exceeding 350 KS/min.

This object is achieved by the features of the independent claims and the associated disengagement of the upper cover from the upper lap guide.

A lap guiding device for guiding a lap is proposed, which includes side frames and a cover, as well as pressure rollers and a lower and an upper lap entrance. The lower lap inlet comprises a lower cover and a lower lap guide, which is at a distance from the lower cover in the area of the lap to be guided. The upper roll inlet comprises an upper cover and an upper roll guide, which is at a distance from the upper cover in the area of the roll to be guided. The upper roll guide is connected to the lower roll guide by a flexible element. The upper cover is fastened in the lap guide independently of the upper lap guide by means of a holding device provided for fastening the upper cover in the side frame or to the cover or to the pressure roller.

The fact that the upper cover is disengaged from the upper lap guide in all alternatives of fastening and is held in a fixed position by means of suitable holding means results in the following advantageous technical effects: no dynamic or mechanical interaction between the upper cover and the upper lap guide occurs, which completely eliminates the risk of wear of the components and the corresponding malfunction. This also means that the combing machine connected to the lap guide device according to the invention does not have to interrupt its operation at any time due to wear effects or malfunctions, which means that the productivity of the combing machine can be greatly increased, in particular in the case of high numbers of combing cycles of more than 350 KS/min.

In a first embodiment, the upper cover is fastened in the lap guide independently of the upper lap guide by means of a holding device provided for fastening the upper cover in the side frame.

Since the upper cover is fastened independently of the upper roll guide, it is possible for the upper roll guide to move without affecting the position of the upper cover. The movement of the upper lap guide is required to prevent possible buckling stresses in the lap during its transport in the lap guide device. The transport of the lap from the transport roller to the feed drum by the lap guide device and also the back and forth movement of the gripper unit act on the upper lap guide, so that if the upper lap guide is exposed to these dynamic interactions, it will cause the lap to warp.

Advantageously, a shaft is provided in the side frame for pivotally holding the upper lap guide, the holding means comprising a shaft clamp for fastening the upper cover in the side frame. The upper lap guide, which is held on the shaft, makes it possible to move the upper lap guide, which is possible depending on the operation. However, the holding device of the upper cover has a shaft clamp and is therefore held on the shaft independently of the upper lap guide. It should be noted that the shaft does not rotate but only serves as a fixed pivot point for the upper lap guide and a holding point for the shaft clamp of the upper cover.

Preferably, a recess at a distance from the shaft is provided in the side frame, and the holding means comprise a cam corresponding to the recess, which holding means is rotatably held on the shaft, and the upper cover is held in a fixed manner in the side frame by means of a cam engaging in the recess in the side frame. This creates a two-point mount for the upper cover. The upper cover is positioned on one side with a shaft clamp on the shaft and brought into an operationally desired position by latching the cam into the recess. This has the following advantages: the upper cover is removable from the cam and pivots away about an axis to remove dust or blockages. This provides an unobstructed access to the upper roll guide and to the transition from the upper roll entrance to the lower roll entrance without having to completely remove the upper cover.

In this embodiment, it is necessary to manually attach the upper cover, and the upper cover remains in its position until it is manually removed from that position again. In this embodiment, the first cover can be attached to the lap guide from another location remote from the combing machine to operate. After the combing machine has completed the operation, the upper cover can be removed from the lap guide device again in a simple manner, so that optimum access to the surface of the upper lap guide or into the inlet opening of the lower lap inlet is possible, for example, in order to clean unwanted fibre fly from these areas before the next operation.

It is particularly preferred that the recess in the side frame is provided in the form of a groove, the depth of which corresponds to the height of the cam and the shape of which corresponds to the rotational movement of the cam about the axis. This configuration allows, on the one hand, a simple way of mounting the upper cover and, on the other hand, cleaning by lifting the upper cover when required. The upper cover can remain attached to the shaft by its shaft clamp, while the cam extends through the slot as the upper cover rotates about the shaft. In order to achieve a particularly stable fastening, springs can be used as cams which allow the groove to extend imprecisely in the rotational movement of the upper cover. This results in a latch when the cam is in the end position.

In a second alternative embodiment, the upper cover is fastened in the lap guide independently of the upper lap guide by means of a holding device provided for fastening the upper cover to the cover. The combing machine or the lap guide is equipped with a cover. If the canopy is opened for operational or maintenance reasons, the combing unit will not continue to operate. At the same time, the movement of the cover also moves the upper cover away from the upper lap guide, resulting in easy access to the upper lap guide.

Preferably, the retaining means comprise a retainer for fastening the upper cover to the cover, and the upper cover is provided with screw-or clip-like connections for fastening to the retainer of the cover. A holder is provided on the cover, to which holder the upper cover of the upper roll inlet is fastened. When the cover is closed, the design of the holder means that the upper cover is in a position intended for operation. The holder connecting the upper cover to the cover by means of the screw results in the fixed position of the upper cover being in the closed position of the cover even if there are multiple movements or jounce movements of the cover. Alternatively, the upper cover is connected to the holder of the cover by a clip. This has the following advantages: the upper cover can be replaced quickly.

In a third alternative embodiment, the upper cover is fastened in the lap guide independently of the upper lap guide by means of a holding device provided for fastening the upper cover to the pressure roller. The pressure roller interacts with the automatic lap splicing device and is only lowered onto the transport roller during the splicing process. This fact is exploited by the claimed configuration and by fastening the upper cover to the pressure roller during each splicing process, the upper cover is also brought into the operating position. Since the upper cover is only needed during the splicing process until the pressed lap reaches the lower lap entrance, the following advantages exist: when the upper cover is not needed, the upper cotton roll inlet is automatically enlarged.

Preferably, the holding device comprises a fixing (fastening) for attaching to the pressure roller in a rotationally fixed manner. The fixing element is designed so that the upper cover does move together with the pressure roller, but maintains the necessary alignment that the upper cover must have with respect to the upper lap guide. For example, a clamping connection to a non-rotating shaft of the pressure roller or a threaded connection to an end shield (end shield) of the pressure roller can be envisaged as a fixing element. Since the pressure roller is only lowered onto the transport roller during the splicing process, the cover is also only brought into the guiding position during this phase. After the splicing process, the pressure roller is lifted off the transport roller and thus automatically increases the distance between the upper cover and the upper lap guide. This allows the lap to enter the lower lap entrance unimpeded via the upper lap guide.

More preferably, the upper cover is provided with a reinforcing rib. The reinforcing ribs have the following advantageous effects: the cover with its particular shape can be made relatively thin-walled, since the reinforcing ribs allow sufficient material strength so that the cover does not split during the entire operation of the combing machine.

It is particularly preferred that the upper and lower covers and the upper and lower lap guides each have a sliding surface on the side facing each other, which sliding surface has a low static friction. This means that the lap can reach the feed drum without stress from the inlet opening, without the risk of warping stress due to friction in the lap guide. Low static friction can be achieved by a corresponding surface design or coating.

A combing machine comprising a lap guide device as described above is also claimed.

Drawings

Embodiments of the invention are explained in more detail below with reference to the drawings, in which:

FIG. 1 is a schematic view of a first embodiment of a lap guide;

FIG. 2 is a schematic perspective view of the upper roll inlet in the first embodiment according to FIG. 1;

FIG. 3 is a schematic view of a second embodiment of a lap guide; and

fig. 4 is a schematic view of a third embodiment of a lap guide.

Detailed Description

Fig. 1 is a schematic view of a first embodiment of a lap guide. This view shows a lap roll (roll) 2 resting on a front lap roll 4 and a rear lap roll (not shown). By rotating the lap reel 2, the lap 3 is brought to the lap splicing device 6. The lap splicing device 6 is used to splice the starting point of the lap 3 of the new lap reel 2 to one end of the lap on the empty lap reel. For a better understanding of these processes, the lap splicing device is shown here only schematically. During the splicing process, lap-joining is performed by means of the lap splicing device 6, placing the start of the new lap 3 from the new lap reel 2 to the end of the old lap web. The overlapping produces a thick spot which is then pressed by means of a transport roller 7 connected to a pressure roller 8 which can be lowered onto the transport roller 7. After the transport roller 7, the lap 3 reaches the upper lap entrance 10. In the upper roll inlet 10, the lap 3 is guided between the upper cover 11 and the upper roll guide 12 to the lower roll inlet 14. The lower roll entrance 14 consists of a lower cover 15 and a lower roll guide 16.

The upper roll guide 12 is connected to the lower roll guide 16 by means of a flexible element 17. The upper lap guide 12 is shaped with a straight portion starting from the side facing the transport roller 7 and with an arcuate portion downstream. This allows a trouble-free transport of the lap 3 and an optimal transition from the upper lap entrance 10 to the lower lap entrance 14 via the flexible element 17.

The upper lap guide 12 is rotatably mounted on a shaft 19. By transferring the movement of the lower lap guide 16 via the flexible element 17, a slight movement 13 of the upper lap guide 12 about the shaft 19 is carried out (see fig. 2). In this way, this movement 13 is not transmitted to the upper cover 11, and the upper cover 11 remains on the side frame 18 of the lap guide. The upper cover 11 is rotatably fastened by means of a shaft clamp 20 to the same shaft 19 as the upper lap guide 12 on the one hand, and is held in a corresponding recess 21 in the side frame by means of a cam 22 on the other hand. The shaft clamp 20 and the cam 22 are provided on either side of the upper cover 11 on the outside thereof, as viewed from the lap 3. In the case of maintenance work, the cam 22 of the upper cover 11 can be detached from the recess 21 in the side frame 18, and the upper cover 11 can be pivoted about the shaft 19.

Fig. 2 is a schematic perspective view of the upper roll inlet 10 in the first embodiment according to fig. 1 as an enlarged view. This view shows the side frame 18 of the lap guide, in which the shaft 19 is held. The upper roll guide 12 of the upper roll inlet 10 is supported on a shaft 19 and is rotatably mounted thereon. The movement 13 of the upper lap guide 12 about the shaft 19 is illustrated by a view of the upper lap guide 12 in solid lines on the one hand and in broken lines on the other hand.

The upper cover 11 is supported on the shaft 19 and held thereon by a shaft clamp 20. The shaft 19 is partially surrounded by a shaft clamp 20 and is thus held on the shaft 20. The cam 22 attached to the upper cover 11 engages in a recess 21 provided in the side frame 18, which means that the upper cover 11 is prevented from rotating about the shaft 19 and is held in a fixed position. The upper cover 11 has a large number of reinforcing ribs 27, which improves the strength of the upper cover 11.

Fig. 3 is a schematic view of a second embodiment of a lap guide. In this case, the lap rolls 2 are mounted on a front lap roll 4 and a rear lap roll 5. The lap is transported from the lap reel 2 via the lap splicing device 6 and the transport roller 7 to the upper lap inlet 10. The lap passes from the upper lap inlet 10 into the lower lap inlet 14, which guides the lap to the combing unit 1. During the change from the old lap to the new lap, the lap joint is pressed by lowering the pressure roller 8 onto the transport roller 7, after which the lap is guided into the upper lap entrance 10.

The combing unit 1 and the lap guide are protected from external influences and manual interventions by a cover 24. The hood 24 is mounted in the combing machine so as to be pivotable about a pivot point 28, as indicated by the movement 25. The movement 25 of the cover 24 about the pivot point 28 is illustrated in fig. 3 by a view of the cover 24 in solid lines on the one hand and in dashed lines on the other hand. A holder 23 is provided on the cover 24, to which the upper cover 11 of the upper roll inlet 10 is fastened. Due to the movement 25 of the cover 24, the upper cover 11 is also moved via the holder 23. The upper cover 11 is held by the holder 23 independently of the upper lap guide 12. This has the following advantages: the movement of the upper lap guide 12 is not transmitted to the upper cover 11.

Fig. 4 is a schematic view of a third embodiment of a lap guide. The lap reel 2 is driven via a lap roller (only the front lap roller 4 is shown in fig. 4) so that the unwound lap 3 is brought into the upper lap entrance 10 via the lap splicing device 6 and the transport roller 7. From the upper lap inlet 10, the lap 3 enters the lower lap inlet 14, which transfers the lap 3 to the combing unit 1. The upper roll inlet 10 comprises an upper roll guide 12 and an upper cover 11, and the lower roll inlet 14 comprises a lower roll guide 16 and a lower cover 15. The upper roll guide 12 is connected to the lower roll guide 16 by means of a flexible element 17. Since the upper roll guide 12 rests on the shaft 19 so as to be freely movable, the movement of the lower roll guide 16 is transmitted to the upper roll guide 12 via the flexible element 17.

During the splicing process, the pressure roller 8 is lowered onto the transport roller 7 in order to press the splicing area of the lap 3. The upper cover 11 of the upper lap inlet 10 is fastened to the pressure roller 8 by means of a fixing element 26. Fixing 26 is applied so that upper cover 11 automatically moves into the correct position during movement 9 of pressure roller 8. Due to the movement 9 of the pressure roller 8 after the lap 3 has been spliced, the upper cover 11 is lifted off the upper lap guide 12, which means that the passage in the upper lap entrance 10 is widened.

List of reference numerals

1 combing unit

2 roll of cotton roll

3 Cotton roll

4 front cotton roll

5 rear lap roller

6 lap splicing device

7 transport roller

8 pressure roller

9 movement of the pressure roller

10 lap inlet

11 upper cover

12 lap guide

13 movement of the lap guides

14 lower lap entrance

15 lower cover

Guide for lap under 16

17 Flexible element

18 side frame

19 shaft

20 axle clamp

21 concave part

22 cam

23 holder

24 cover

25 movement of the cover

26 fastener

27 reinforcing rib

28 pivot point of the cover.

Claims

1. A lap guiding device for guiding a lap (3), comprising side frames (18) and a cover (24) as well as a pressure roller (8) and a lower lap entrance (14) comprising a lower cover (15) and a lower lap guide (16) at a distance from the lower cover (15) in the area of the lap (3) to be guided, and comprising an upper lap entrance (10) comprising an upper cover (11) and an upper lap guide (12) at a distance from the upper cover (11) in the area of the lap (3) to be guided, the upper lap guide (12) being connected to the lower lap guide (16) by a flexible element (17), characterized in that the upper cover (11) is fastened to the lap guiding device independently of the upper lap guide (12) by means of a holding device Wherein the holding device is provided for fastening the upper cover (11) in the side frame (18) or to the cover (24) or to the pressure roller (8).

2. Lap guide device according to claim 1, characterised in that a shaft (19) is provided in the side frame (18) for pivotally holding the upper lap guide (12), the holding device comprising a shaft clamp (20) for fastening the upper cover (11) in the side frame (18).

3. Lap guide according to claim 2, characterised in that a recess (21) at a distance from the shaft (19) is provided in the side frame and in that the holding means comprise a cam (22) corresponding to the recess (21), which holding means are rotatably held on the shaft (19) and in that the upper cover (11) is held in a fixed manner in the side frame (18) by means of the cam (22) engaging in the recess (21) in the side frame (18).

4. Lap guide according to claim 3, in which the recess (21) in the side frame (18) is provided in the form of a groove, the depth of which corresponds to the height of the cam (22) and the shape of which corresponds to the rotational movement of the cam (22) about the shaft.

5. Lap guide according to claim 1, characterized in that the retaining means comprise a retainer (23) for fastening the upper cover (11) to the cover (24), and in that the upper cover (11) is provided with screw-or clip-like connections for fastening to the retainer (23) of the cover (24).

6. Lap guide according to claim 1, characterized in that the retaining means comprise a fixing element (26) for attaching in a rotationally fixed manner to the pressure roller (8).

7. Lap guide according to any one of the preceding claims, characterized in that the upper cover (11) is provided with reinforcing ribs (27).

8. Lap guide device according to any one of the preceding claims, characterized in that the upper cover (11) and the lower cover (15) and the upper (12) and lower (16) lap guides each have a sliding surface on the side facing each other, which has a low static friction.

9. Combing machine comprising a lap guide device according to at least one of the preceding claims.