EP3868931B1 - Lap guiding device for automatic lap piecing device - Google Patents

Description

The present invention relates to a lap guide device for a combing machine for guiding a lap, the lap guide device having a side frame and a cover and a pressure roller and a lower and an upper lap inlet.

In a comber with an automatic lap piecing, as from the EP 0 368 059 A1 known, a beginning of a cotton tape from a new roll is automatically attached to an end of a cotton tape from a previous roll, with a qualitatively consistent and predetermined coverage of the two cotton ends is guaranteed.

After connecting the two ends of the respective lap band with the winding piecing, the lap is by means of a transport roller - in the conveying direction - via a lap guide device, such as from the CN206467357 U known, led to a feed cylinder of a comber. The generic lap guide device has an upper lap inlet with an upper cover and an upper lap guide, the upper lap guide being connected to a lower lap guide via a flexible element.

In connection with the automatic lap piecing, the top cover of the upper lap inlet has the main task of gently transferring the newly attached lap into the lap guide device. If the upper cover of the upper lap inlet were missing, the newly attached lap would overshoot the lower lap inlet and accumulate, especially with high numbers of combing cycles of over 350 KS/min, so that the lap would not reach the feed cylinder. This accordingly leads to an operational interruption of the combing machine.

Furthermore, the conventional lap guiding device for the automatic lap piecing is designed in such a way that on the one hand it guides the lap from the transport rollers to the feed cylinder without distortion stresses and on the other hand counteracts the reciprocating movement of a gripper unit. To accomplish this, the upper batt guide performs a dynamic movement depending on the speed of the comber (number of combing cycles). The movement of the lap guide is designed to prevent possible distortion stresses during transport of the lap in the lap guide device. The lap transport from the transport rollers through the lap guide device to the feed cylinder and also the reciprocating movement of the gripper unit act on the lap guide in such a way that as little as possible a distortion of the lap is caused.

Since the known lap guide devices are designed in such a way that the upper cover is connected to the upper lap guide via locking cams and a retaining clip, the upper cover is also subjected to the dynamic movements together with the upper lap guide.

Combers of the newer generation are operated with far higher numbers of combing cycles from 500 KS/min to 700 KS/min. Due to the high number of combing cycles in connection with a cotton to be processed and possibly heavily soiled, this leads to a high dynamic interaction between the upper batting guide and the upper cover at the connection points of the locking cams and the retaining clip. This in turn leads to increased wear and associated failure of these joints between the top cover and the top batt guide. Accordingly, the top cover falls into the interior of the combing machine and damages the components of the combing machine such as the circular combs and top combs. Consequently, with the known lap guide device, at high numbers of combing cycles of over 350 KS/min, undesired downtimes have to be recorded, which cause considerable costs for the spinning mill owner.

The object of the present invention is therefore to provide a lap guide device which enables reliable and trouble-free operation of the combing machine, particularly at higher combing cycles above 350 KS/min. This object is achieved by the features of the independent patent claim and an associated decoupling of the top cover from the top batting guide.

A lap guide device for guiding a lap is proposed, the lap guide device having a side frame and a cover hood and a pressure roller and a lower lap inlet and an upper lap inlet. The lower lap inlet has a lower cover and a lower lap guide spaced apart from the lower cover in the area of the lap to be guided. The top lap inlet has a top cover and a top lap guide spaced from the top cover in the area of the lap to be guided. The upper batting guide is connected to the lower batting guide by a flexible member. The top cover is fixed independently of the top lap guide in the lap guide device with a holder, the holder being provided for fastening the top cover in the side frame or on the cover hood or on the pressure roller.

Due to the fact that the upper cover is decoupled from the upper lap guide in all alternatives of attachment and is held in the fixed position via corresponding holding devices, the advantageous technical effect results that no dynamic or mechanical interactions can take place between the upper cover and the upper lap guide , which completely eliminates the risk of wear and tear and the corresponding failure of the component. This also means that the combing machine in connection with the inventive lap guide device does not have to interrupt its operation at any time due to wear effects or failures, which means that the productivity of the combing machine can be significantly increased, especially with high combing cycles over 350 KS/min.

In a first embodiment, the top cover is fixed independently of the top lap guide in the lap guide device with a holding device, the holding device being provided for fixing the top cover in the side frame.

Mounting the top cover independently of the top batt guide allows the top batt guide to move without affecting the position of the top cover. The movement of the upper lap guide is necessary in order to prevent possible distortion stresses in the lap during transport of the lap in the lap guide device. The lap transport from the transport rollers through the lap guide device to the feed cylinder and also the reciprocating movement of the gripper unit act on the upper lap guide in such a way that this would cause the lap to be distorted if the upper lap guide were exposed to these dynamic interactions.

Advantageously, an axle for the pivotable mounting of the upper lap guide is provided in the side frame, the holding device for fastening the top cover in the side frame having an axle clamp. The mounting of the upper batting guide on the axis allows the movements of the upper batting guide which are operationally possible. The top cover retainer, on the other hand, has an axle clamp and is held on the axle independently of the top lap guide. It should be noted that the axle does not rotate, it merely serves as a fixed pivot point for the top lap guide and as a fulcrum for the top cover axle clamp.

Preferably, a recess is provided in the side frame at a distance from the axle and the holding device has a cam corresponding to the recess, the holding device being held rotatably on the axle and the upper cover being held in place in the side frame by engagement of the cam in the recess in the side frame is. This creates a two-point bearing for the top cover. On the one hand, the upper cover is positioned on the axle with the axle clamp and brought into the operationally desired position by engaging the cams in the recess. This has the advantage that the top cover can be removed from the cams and pivoted away around the axis to remove dirt or blockages. This creates free access to the upper batting guide as well as to the transition from the upper one Cotton spout to the bottom cotton spout without having to completely remove the top cover.

In this embodiment, manual attachment of the top cover is required and the top cover remains in place until manually removed therefrom. In this embodiment, the first cover can be placed in the lap guide device for operation from a different location, away from the comber. After the operation of the combing machine has ended, the upper cover can be easily removed from the lap guide device, so that optimal access to a surface of the upper lap guide or to an inlet opening of the lower lap inlet is possible in order to prevent these areas from flying fibers, for example to be cleaned before the next operation.

The depression in the side frame is particularly preferably provided in the form of a slot, the depth of which corresponds to a height of the cam and the shape of which corresponds to a rotary movement of the cam about the axis. On the one hand, this design allows easy assembly of the top cover and, on the other hand, cleaning by folding up the top cover if necessary. The top cover can remain fixed with its axle clamp on the axle while the cams are extended via the slots with a rotating movement of the top cover about the axle. In order to achieve a particularly stable attachment, springs can be used as cams, which allow the slots not to run exactly in the rotational movement of the top cover. This results in locking when the cams are in the end position.

In a second alternative embodiment, the top cover is fixed independently of the top lap guide in the lap guide device with a holding device, the holding device being provided for fastening the top cover to the cover hood. Combers and lap guide devices are equipped with hoods. If the cover hood is opened for operational or maintenance reasons, the combing unit cannot continue to be operated. At the same time, the top cover is opened by the movement of the cover hood also moved away from the upper lap guide and easy access to the upper lap guide results.

The holding device preferably has a holder for fastening the top cover to the hood, and the top cover is designed with screws or with a clip-like connection for fastening to the holder of the hood. A holder is provided on the cover hood, to which the upper cover of the upper cotton inlet is attached. When the cover hood is closed, the design of the holder means that the upper cover hood is in the position provided for operation. The connection of the top cover with screws on the holder of the cover results in a secure position of the top cover in the closed position of the cover, even if the cover moves repeatedly or jerkily. Alternatively, the top cover is connected to the cover holder with a clip. This has the advantage that the top cover can be replaced quickly.

In a third alternative embodiment, the top cover is fixed independently of the top lap guide in the lap guide device with a holding device, the holding device being provided for fixing the top cover to the pressure roller. The pressure rollers work together with the automatic lap piecing and are only lowered onto the transport roller during a piecing process. This circumstance is exploited by the claimed embodiment and the upper cover is also brought into the operating position during a piecing process by being fastened to the contact pressure roller. Since the upper covering is only necessary for the period of the attachment process until the compressed wadding reaches the lower wadding inlet, there is the advantage that the upper wadding inlet is automatically enlarged when this is not necessary.

Preferably, the holding device has a fixation for non-rotatable attachment to the contact pressure roller. The fixation is designed in such a way that the upper cover moves with the pressure roller, but the necessary Maintains alignment that the top cover must have with respect to the top batt guide. A clamping connection with a non-rotating axis of the pressure roller or a screw connection on the end shields of the pressure roller is conceivable as a fixation. Due to the fact that the contact pressure roller is only lowered onto the transport roller during a piecing process, the top cover is also brought into a guide position only during this phase. After the piecing process, the pressure roller is lifted off the transport roller, automatically increasing the distance between the top cover and the top lap guide. This allows the wadding to pass unhindered via the upper wadding guide into the lower wadding inlet.

More preferably, the top cover is provided with reinforcing ribs. The reinforcing ribs have the advantageous effect that the upper cover with its specific shape can be made relatively thin-walled because the reinforcing ribs allow sufficient material strength so that the upper cover cannot break apart during the entire operation of the combing machine.

Particularly preferably, the upper and lower cover and the upper and lower lap guide each have a sliding surface with low static friction on a mutually facing side. This means that the lap can get from the inlet opening to the feed cylinder without stress, without the risk of distortion stresses due to friction effects in the lap guide device. The low static friction can be achieved by an appropriate surface design or a coating.

A combing machine with a lap guide device according to the above description is also claimed.

Figur 1

eine schematische Darstellung einer ersten Ausführungsform einer Watteführungsvorrichtung;

Figur 2

eine schematische perspektivische Darstellung eines oberen Watteeinlaufs der ersten Ausführungsform nach Figur 1 ;

Figur 3

eine schematische Darstellung einer zweiten Ausführungsform einer Watteführungsvorrichtung und

Figur 4

eine schematische Darstellung einer dritten Ausführungsform einer Watteführungsvorrichtung.

Exemplary embodiments of the invention are explained in more detail below with reference to the drawings. In these show:

figure 1

a schematic representation of a first embodiment of a lap guide device;

figure 2

a schematic perspective view of an upper wad inlet of the first embodiment figure 1 ;

figure 3

a schematic representation of a second embodiment of a lap guide device and

figure 4

a schematic representation of a third embodiment of a lap guide device.

figure 1 shows a schematic representation of a first embodiment of a lap guiding device. The illustration shows a lap roll 2, which rests on a front winding roller 4 and a rear winding roller, not shown. A lap 3 is brought to a lap applicator 6 by rotation of the lap roll 2 . The lap applicator 6 serves to attach a beginning of a lap 3 of a new lap roll 2 to an end of a lap of an empty lap roll. The cotton piecing is shown here only schematically for a better understanding of the processes. During a piecing process, the beginning of the new lap 3 from the new lap roll 2 is placed on the end of an old lap sliver with an overlap by the lap piezer 6 . The overlap results in a thick point, which is then compressed by means of a transport roller 7 in conjunction with a pressure roller 8 that can be lowered onto the transport roller 7 . Following the transport roller 7, the lap 3 reaches an upper lap inlet 10. In the upper lap inlet 10, the lap 3 is guided between an upper cover 11 and an upper lap guide 12 to a lower lap inlet 14. The lower lap inlet 14 consists of a lower cover 15 and a lower lap guide 16.

The upper lap guide 12 is connected to the lower lap guide 16 by a flexible member 17 . The shape of the upper lap guide 12 has a straight section starting from a side facing the transport roller 7 and an arcuate section downstream. This enables a trouble-free Transport of the lap 3 and an optimal transition from the upper lap inlet 10 via the flexible element 17 into the lower lap inlet 14.

The upper lap guide 12 is rotatably mounted on an axle 19 . By transmitting the movements of the lower lap guide 16 via the flexible element 17, a slight movement 13 takes place (see FIG figure 2 ) of the upper lap guide 12 about the axis 19. So that this movement 13 is not transmitted to the upper cover 11, the upper cover 11 is held on a side frame 18 of the lap guide device. The top cover 11 is rotatably mounted on the one hand with an axle clamp 20 on the same axis 19 as the upper lap guide 12 and on the other hand held with cams 22 in corresponding recesses 21 in the side frame. Axle clamp 20 and cam 22 are provided on both sides of the upper cover 11 on the outer sides thereof, seen from the cotton wool 3 . In the event of maintenance work, the cams 22 of the top cover 11 can be released from the recesses 21 in the side frame 18 and the top cover 11 can be pivoted about the axis 19.

2 12 shows a schematic perspective view of an upper lap inlet 10 of the first embodiment figure 1 as an enlargement. The illustration shows the side frame 18 of the lap guide device in which the axle 19 is held. The upper lap guide 12 of the upper lap inlet 10 is supported on the axle 19 and is rotatably mounted on it. The movement 13 of the upper lap guide 12 about the axis 19 is illustrated by a representation of the upper lap guide 12 with solid lines on the one hand and dashed lines on the other.

The top cover 11 is supported on the axle 19 and is held on this with the axle clamp 20 . The axle 19 is partially encompassed by the axle clamp 20 and is thus held on the axle 20 . A cam 22 mounted on the top cover 11 engages a recess 21 provided in the side frame 18, thereby preventing the top cover 11 from rotating about the axis 19 and holding it in a fixed position. The top cover 11 has a number of reinforcement ribs 27 which improve the strength of the top cover 11 .

figure 3 shows a schematic representation of a second embodiment of a lap guide device. A lap roll 2 is mounted on a front winding roller 4 and a rear winding roller 5 . A lap is conveyed from the lap roll 2 via a lap piecing 6 and a transport roller 7 to an upper lap inlet 10 . From the upper lap inlet 10 the lap enters a lower lap inlet 14 which leads the lap to the combing unit 1 . During a change from an old lap to a new lap, a connecting point of the lap is pressed onto the transport roller 7 by lowering a pressure roller 8 before the latter is guided into the upper lap inlet 10 .

The combing unit 1 and the lap guide device are protected by a cover 24 against external influences and manual intervention. The hood 24 is pivotally mounted about a pivot point 28 as shown by movement 25 in the comber. The movement 25 of the cover 24 about the pivot point 28 is illustrated by a representation of the cover 24 with solid lines on the one hand and dashed lines on the other figure 3 illustrated. A holder 23 is provided on the cover hood 24, to which the upper cover 11 of the upper cotton inlet 10 is fastened. The upper cover 11 is also moved in each case via the holder 23 by the movement 25 of the cover hood 24 . The upper cover 11 is held independently of the upper lap guide 12 by the holder 23 . This has the advantage that movement of the top lap guide 12 is not transmitted to the top cover 11 .

4 shows a schematic representation of a third embodiment of a lap guiding device. The cotton roll 2 is over the winding rollers (in figure 4 only the front winding roller 4 is shown) driven in such a way that the unrolled lap 3 is brought into the upper lap inlet 10 via the lap piecing 6 and the transport roller 7 . The lap 3 passes from the upper lap inlet 10 into the lower lap inlet 14 which transfers the lap 3 to the combing unit 1 . The upper lap inlet 10 has an upper lap guide 12 and an upper cover 11 and the lower lap inlet 14 has a lower lap guide 16 and a lower cover 15 . The upper lap guide 12 is connected to the lower lap guide 16 via a flexible Element 17 connected. Because the upper lap guide 12 rests freely on an axis 19 , a movement of the lower lap guide 16 is transmitted to the upper lap guide 12 via the flexible element 17 .

During a piecing process, a pressure roller 8 is lowered onto the transport roller 7 in order to press a piecing region of the lap 3 . The upper cover 11 of the upper lap inlet 10 is attached to the pressure roller 8 with a fixation 26 . The fixation 26 is designed in such a way that the upper cover 11 automatically gets into the correct position when the pressure roller 8 moves 9 . Due to the movement 9 of the pressure roller 8 after the lap 3 has been placed, the upper cover 11 is lifted off the upper lap guide 12, as a result of which the passage in the upper lap inlet 10 widens.

Legend

1

combing unit

2

cotton wrap

3

cotton

4

Front winding roller

5

Rear winding roller

6

cotton piecing

7

transport roller

8th

pressure roller

9

Pressure roller movement

10

Upper cotton enema

11

Top cover

12

Top batting guide

13

Movement Upper batting guide

14

Lower cotton inlet

15

Bottom cover

16

Bottom batting guide

17

Flexible item

18

side frame

19

axis

20

axle clamp

21

deepening

22

cam

23

holder

24

cover hood

25

movement hood

26

fixation

27

reinforcement ribs

28

Pivot cover hood

Claims (9)

1. Lap guiding device for guiding a lap (3), comprising a side frame (18) and a cover hood (24) and a pressure roller (8) and a lower lap inlet (14), which comprises a lower cover (15) and a lower lap guide (16) that is at a distance from the lower cover (15) in the region of the lap (3) to be guided, and comprising an upper lap inlet (10), which comprises an upper cover (11) and an upper lap guide (12) that is 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), characterized in that the upper cover (11) is fastened in the lap guiding device independently of the upper lap guide (12) by means of a retaining device, the retaining device being provided for fastening the upper cover (11) in the side frame (18) or to the cover hood (24) or to the pressure roller (8).
2. Lap guiding device according to claim 1, characterized in that a shaft (19) is provided in the side frame (18) for pivotally retaining the upper lap guide (12), the retaining device comprising a shaft clamp (20) for fastening the upper cover (11) in the side frame (18).
3. Lap guiding device according to claim 2, characterized in that a recess (21) that is at a distance from the shaft (19) is provided in the side frame, and in that the retaining device comprises a cam (22) corresponding to the recess (21), the retaining device being rotatably retained on the shaft (19) and the upper cover (11) being retained in the side frame (18) in a fixed manner by the cam (22) engaging in the recess (21) in the side frame (18).
4. Lap guiding device according to claim 3, characterized in that the recess (21) in the side frame (18) is provided in the form of a slot, the depth of which corresponds to a height of the cam (22) and the shape of which corresponds to a rotational movement of the cam (22) about the shaft.
5. Lap guiding device according to claim 1, characterized in that the retaining device comprises a retainer (23) for fastening the upper cover (11) to the cover hood (24) and the upper cover (11) is formed by screws or a clip-like connection for fastening to the retainer (23) of the cover hood (24).
6. Lap guiding device according to claim 1, characterized in that the retaining device comprises a fixing (26) for being attached to the pressure roller (8) in a rotationally fixed manner.
7. Lap guiding device according to any of the preceding claims, characterized in that the upper cover (11) is provided with reinforcing ribs (27).
8. Lap guiding device according to any of the preceding claims, characterized in that the upper cover (11) and the lower cover (15) and the upper lap guide (12) and lower lap guide (16) each have a sliding surface having low static friction on one side facing one another.
9. Combing machine comprising a lap guiding device according to at least one of the preceding claims.

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