Combing machine

Abstract

the invention relates to a combing machine, designed for producing combed fibres, comprising at least one combing head (20) with a feed device, wherein the combing head (20) has at least one feed cylinder (7), which is designed to supply fibres that are connected to one another from the feed device to a nipper assembly (5), which is designed to clamp the interconnected fibres, as well as comprising at least one pair of pull-off rollers (10, 12; 11, 13) which is designed to pull the clamped fibres out of the nipper assembly (5), wherein each pair of pull-off rollers (10, 12; 11, 13) has a pull-off roller (10, 11) that is driven from both sides by a drive, wherein the pull-off roller (10, 11) that is driven from both sides has a separation point (35) or the pull-off roller (10, 11) is formed by two separate segments, such that the pull-off roller (10, 11) can be driven on both sides in a different rotational direction. The invention is characterised in that the separation point (35) is formed in the region of a mounting point, or in that the two separate segments are mounted together in the region of a mounting point.

Description

[0001] The present invention relates to a combing machine according to the preamble of claim 1.

[0002] In the classic combing method, e.g., according to Heilmann, cotton wool is removed from a cotton roll and fed to a pair of tongs by means of a feed roller. In a retracted position, the tongs are closed and hold a protruding front end section of the cotton wool in the form of a fiber beard. This protruding fiber beard is combed out by the round comb located below the tongs. The tongs are then moved to a forward, open position, whereby the tear-off rollers, by rotating backward, convey a previously combed-out fiber beard, along with its rear end section, towards the front end section of the cotton wool held by the tongs. The fiber beard combed out by the round comb lies on this rear end section and is drawn together into the clamping point of the tear-off rollers, as the tear-off rollers reverse their direction of rotation.During this rotation, where the angle of rotation is approximately twice that of the preceding reverse rotation, the fiber strand is torn from the cotton wool located in the clamping unit. The rear end of the torn fiber strand is then pulled through the fixed comb.

[0003] The stripping rollers perform a stepping motion, returning an end piece of the fiber stripped during the previous combing cycle during a return rotation. The beginning piece of the fiber strip is placed onto this end piece and, after a reversal of rotation, soldered together by the pressure of the two stripping rollers. With each combing cycle, the stripping rollers must not only change their direction of movement twice, but also travel a shorter distance on the return stroke than on the forward stroke. A cam disc, cam wheel, or cam groove is often used for this movement of the stripping rollers, which is rigidly coupled to the gripper movement via a gearbox. This reciprocating stepping motion of the stripping rollers, when the adjacent combing heads are coupled via a gearbox, places an extremely high load on the shafts at combing cycles exceeding 400 per minute, leads to significant vibrations in the combing machine, and consumes a great deal of energy.The drive motors for the stripping rollers must be very powerful and also require high-performance servo drives to power them. The constant acceleration and deceleration result in significant power losses, which impact the combing machine's energy consumption and necessitate water cooling of the electric motors when the combing speed exceeds 500 strokes per minute. This makes the motors very expensive.

[0004] Typically, the individual components of the combing machine, such as the gripper unit, the circular comb, and the stripping rollers, are driven by an interconnected motor-gearbox combination located on one side of the combing machine. This combination causes a corresponding twist in the shafts along the drive length. This shaft twist is undesirable because it leads to inaccuracies in the delivery of what is usually at least eight fiber slivers from the comb heads. To achieve higher productivity, the number of comb heads is increased, as the stepping motion reaches its limit at around 700 cycles per minute. However, this further increases the torsion in the drive shafts, as they must be made 10 to 16 comb heads longer.

[0005] From EP 2397584 B1, a combing machine is known in which the two pairs of stripping rollers are driven from both sides of the combing machine. The driven stripping rollers have a separate drive motor at each end, which are synchronized with each other but can be controlled independently of the overall drive-gearbox combination of the combing machine. This significantly reduces the torsion of the stripping rollers, thereby also lowering the energy consumption of the combing machine.

[0006] EP 2246464 A1 discloses a tear-off roller which, for manufacturing reasons, consists of several segments, since hardening many short segments is more cost-effective than hardening a 4m to 6m long shaft. The individual segments are screwed and bonded together to form a continuous tear-off roller, with each segment having a threaded bore and a threaded stud on one end face. In one embodiment, it is disclosed to connect the segments by means of a separate stud that engages in the threaded bores of both segments. At the separation point, the segments are thus reconnected by the stud. With this design, it is not possible to drive the segments connected by the stud independently of each other in alternating directions of rotation.Even if the connection point with the pin has opposing threads, at the high changing frequency either a length compensation of the entire breakaway roller must be carried out permanently, or the connection point must be additionally secured.

[0007] Despite the synchronization of the drive motors, they do not run perfectly in sync. A time delay of a few milliseconds was observed, meaning that the first motor in the rotation is always driving against the torque of the second motor. This is compounded by play in the drive components, which is exacerbated by the time delay. This is particularly noticeable when changing the direction of rotation, as the first motor in the rotation heats up more after the direction is reversed and consequently has to drive against the torque of the second motor, which has not yet completed the change in direction.

[0008] Accordingly, the invention is based on the objective of further developing a combing machine in such a way that the disadvantages of the drive concept are eliminated and the assembly of the tear-off rollers is simplified.

[0009] The invention solves the stated problem by means of a system with the features specified in claim 1. Advantageous embodiments of the invention are defined in the dependent claims.

[0010] The invention relates to a combing machine designed for the production of combed fibers, comprising at least one combing head with a feeding device. The feeding device can be configured as a support for cotton wool coils or as a feeder for fiber slivers placed in cans. The at least one combing head has at least one feeding cylinder configured to feed interconnected fibers from the feeding device to a clamping unit. The clamping unit is configured to clamp the interconnected fibers. At least one pair of tear-off rollers is arranged downstream of the clamping unit, configured to tear the clamped fibers from the clamping unit. Each pair of tear-off rollers has a tear-off roller that is driven from both sides by a drive mechanism.

[0011] The invention includes the technical teaching that the at least one breaker roller, driven from both sides, has a separation point or is formed from two separate segments, so that this breaker roller can be driven simultaneously from both sides in different directions of rotation. The ability to drive the breaker roller from both sides and simultaneously in different directions of rotation achieves torque compensation between the two drive motors, preventing the breaker rollers from being subjected to opposing torsional forces. Consequently, the drive motors consume less energy and generate less heat, resulting in a higher number of comb cycles during combing operation. Furthermore, driving the at least one breaker roller in different directions of rotation offers the technological advantage that the breaker roller can be operated with different breaker curves for groups of comb heads.This allows for improved uniformity of nonwoven quality across all combing heads. For example, the at least one split stripper roll can deliver different strip masses along the length of the combing machine. Depending on the combing machine configuration, it may be sufficient to design a single driven stripper roll that can be operated in different directions of rotation. This could be the first or second stripper roll after the gripper unit, depending on the desired effect. Depending on the combing concept, the function of the second stripper roll can be taken over by another element, such as a suction strip or roller. However, with two pairs of stripper rolls, both double-sided driven stripper rolls are usually designed so that they can be operated simultaneously in opposite directions.

[0012] The at least one tear-off roller can have a separation point, so that the continuous tear-off roller is designed in two parts. Alternatively, the tear-off roller can consist of two separate segments. Each segment of the tear-off roller is driven by its own drive, so that the segments of a tear-off roller can be operated independently of each other. For example, the first segment of the tear-off roller, which is assigned to the comb heads furthest from the drafting unit, can be operated with a different tear-off curve than the second segment. This can, for example, produce a slightly higher strip count, since these strips are subject to greater distortion over the longer transport distance to the drafting unit.

[0013] If the segments of a tear-off roller are operated with different tear-off curves, the corresponding upper – non-driven – tear-off roller is preferably also divided, corresponding to the lower, driven tear-off roller. This minimizes wear on the tear-off rollers and prevents distortion of the fiber beard or the soldered fiber web. However, the technological necessity of a divided upper tear-off roller depends on the difference between the various tear-off curves.

[0014] Because the separation point is located at a bearing point, or because the two separate segments are supported together at a single bearing point, this bearing point can be designed as a floating bearing. The fixed bearing of the segments is then located on the frame of the combing machine in the area of ​​the drive motors. A connection between the two segments is then no longer necessary. This simplifies the assembly of the combing machine.

[0015] The segments of the tear-off roller can be connected at the separation point by means of a bearing shell designed to allow the segments to rotate in opposite directions. Both segments, or parts of the separated tear-off roller, are supported in a common bearing shell, which simplifies the design and alignment of the segments relative to each other. The tear-off roller thus has two separate segments, which are, however, axially aligned via the bearing shell. The two segments can be driven simultaneously and independently in opposite directions.

[0016] The end pieces or shaft journals of the adjacent segments of the tear-off roller can be inserted into bearing shells, within which the end pieces or shaft journals are supported by means of rolling bearings, preferably needle bearings.

[0017] The separation point or the storage of the separated segments can be arranged symmetrically or asymmetrically between the comb heads. This allows for the operation of four comb heads, groups of three or five comb heads, or two or six comb heads with varying break-off curves. For combing machines with more than eight comb heads, for example, ten, twelve, or sixteen comb heads, the arrangement can be analogous.

[0018] The tear-off roller can have a number of roller sections corresponding to the number of comb heads. A separate roller section is provided for each comb head, and these sections are connected to each other at a bearing point. This simplifies the axial alignment and bearing of the tear-off roller and reduces manufacturing and assembly costs. Each segment of the tear-off roller can have at least one roller section, preferably at least two.

[0019] The roller sections are preferably joined in the area of ​​the bearing points of the breaker roller by means of threaded studs and threaded holes. A permanent connection is achieved by additional bonding or soldering, or alternative fixing of the thread or the roller sections to each other, so that this section of the segment can be described as a single piece. Bearing shells are mounted over the connection point to ensure centering.

[0020] If the combing machine has two pairs of stripping rollers, preferably only one driven stripping roller is split or consists of two segments. This is preferably the first stripping roller, which is arranged after the gripper unit, since this one consumes the most energy due to the stripping motion of the fiber strand.

[0021] Preferably, both driven tear-off rollers can have a separation point or be formed from two separate segments, whereby both driven tear-off rollers and / or their separate segments can be driven with different tear-off curves. This allows for a smooth movement of the tear-off rollers relative to each other, but also across the width of the combing machine, which saves energy and can influence the strip quality.

[0022] Further measures improving the invention are described in more detail below together with a description of a preferred embodiment of the invention with reference to the figures.

[0023] They show: Figure 1: a schematic side view of a combing head of a combing machine according to the prior art; Figure 2: a schematic view of a drive concept for the tear-off rollers of a combing machine according to the prior art; Figure 3: a view of the tear-off rollers according to the invention; Figure 3a: an enlarged view of the separation point of the tear-off rollers.

[0024] The following are, with reference to the Fig. 1 and 2 the state of the art and in the Figures 3 and 3a Preferred embodiments of the combing machine according to the invention are explained. Identical features in the drawing are identified by the same reference numerals. It should be understood that the drawing is simplified and, in particular, not to scale.

[0025] In Figure 1A combing head 20 according to the prior art is shown, of which at least eight are mounted on a combing machine. For the sake of clarity, the exemplary embodiment is shown and described using only one combing head 20, wherein the details shown are installed on each of these combing heads, except for the common drive units and the tape tray. The combing head 20 consists, among other things, of two winding transport rollers 2, 3, on which a wadding roll 1 with a winding sleeve rests and from which the wadding tape 4 is unwound by a tensile load from a feed roller 7. The winding transport rollers 2, 3 can be driven individually or both together. The design of the winding transport rollers 2, 3, whether they are only rotating and not driven, or individually or both driven, is not relevant to the invention.

[0026] The wadding strip 4 is transferred to a feed cylinder 7 of a gripper assembly 5. The gripper assembly 5 is movable back and forth via levers and driven by a shaft 6, which is connected to a gearbox 17. According to the illustrated example, the gripper assembly 5 is in a forward position and transfers the combed-out fiber strand to a subsequent pair of tear-off rollers 10, 12, the first in the fiber transport direction. A circular comb 8 is rotatably mounted below the gripper assembly 5, and its comb segment combs out the fiber strand presented by the closed gripper. The circular comb 8 is also driven by the gearbox 17. A ratchet wheel (not shown) is mounted on the feed cylinder 7. The ratchet wheel is rotated incrementally by the back-and-forth movement of the gripper assembly 5 via a pawl (also not shown), thereby feeding the wadding strip 4 to the gripper jaws for combing.During operation, the wadding strip 4 is continuously unwound by the rotary motion of the wadding coil 1 over the winding transport rollers 2, 3 and reaches the feed cylinder 7. The wadding is then fed via the feed cylinder 7 to the gripper jaws of the gripper unit 5 for combing and subsequently discharged to the first pair of tear-off rollers 10, 12 in the fiber transport direction. The discharged fiber fragment is drawn through the fixed comb 9 and soldered to the preceding fiber fragment. The resulting fiber web 14 is transferred via a second pair of tear-off rollers 11, 13 in the fiber transport direction. The fiber web 14 formed here, which consists of individual soldered pieces of fiber fragment, is drawn through a hopper 15 by means of take-off rollers 16 and formed into a fiber strip 21. This strip, along with the fiber strips also formed at the other comb heads, is fed to a drawing unit (not shown).The fleece emerging from the drawing machine is gathered into a fiber strip, the so-called combing machine strip, and transferred to a strip tray for placement in a can.

[0027] In this state of the art, the gripper unit 5 is moved into a forward, open position, whereby the tear-off rollers 10, 12, by means of a reverse rotation, convey a previously combed-out fiber strand with its rear end section towards the front end section of the cotton wool clamped by the gripper. The tear-off rollers 11, 13 perform the same movement, so that the fiber pile 14 is moved back a short distance. The fiber strand combed out by the round comb 8 lies onto this rear end section and is drawn together with it into the clamping point of the tear-off rollers 10, 12, as the tear-off rollers 10, 12 and 11, 13 reverse their direction of rotation again. During this rotation, in which the angle of rotation is approximately twice that of the preceding reverse rotation, the fiber strand is torn from the cotton wool located in the gripper unit 5. The rear end of the torn fiber beard is pulled through the fixed comb 9.The stripping rollers 10, 12, 11, 13 perform a stepping motion, retracting an end piece of the fiber strip removed during the previous combing cycle during a return rotation. The beginning piece of the fiber strip is placed onto this end piece and, after a reversal of rotation, soldered together by the pressure of the two stripping rollers 10, 12. The stripping rollers 10, 12, 11, 13 must not only change their direction of movement twice during each combing cycle, but also rotate a shorter distance on the return stroke than on the forward stroke. In this embodiment, all components of the combing machine described here are driven by a motor 18, in which a complex transmission rigidly converts the movement of the gripper assembly 5, the fixed and circular combs 8, 9, as well as the stripping rollers 10-13 and the feed roller 7. A change in the sequence of movements requires a fixed change in the transmission 17, i.e., by replacing gears.The productivity of the combing machine can be adjusted, among other things, using control unit 19.

[0028] Fig. 2 The drive concept according to the state of the art of EP 2397584 B1 is shown, according to which the drive of the lower tear-off rollers 10, 11 is derived from the drive concept of the Figure 1 The combing machine described is decoupled. The tear-off rollers 10, 11 are driven from both sides by separate drive motors 29, 30. As in Fig. 2As shown, a gearbox 24 is provided at each end of the combing machine along its longitudinal direction. Shafts 25, 26 of the stripping rollers 10, 11 are arranged parallel to each other between the gearboxes 24. The ends of the shafts 25, 26 project into the gearboxes 24 and are supported there. Gears 27, 28 are attached to the ends of the shafts 25 and 26, respectively, to rotate integrally with the shafts 25 and 26. The gears 27, 28 have the same number of teeth and the same diameter. Two drive motors 29, 30, designed as servo motors, are attached to each gearbox 24 to drive the shafts 25 and 26, respectively. The drive motors 29, 30 have motor shafts 29a, 30a, which each project into the gearboxes 24. Drive gears 31, 32 are attached to the motor shafts 29a, 30a in order to rotate integrally with them.The drive gears 31, 32 have the same number of teeth and the same diameter as the gears 27, 28. Each gear unit 24 has an intermediate gear 33 that meshes with the gear 27 and the drive gear 31. The intermediate gear 34 meshes with the gear 28 and the drive gear 32. The intermediate gears 33, 34 are designed to have the same number of teeth and the same diameter. That is, the shafts 25, 26 are driven via gear trains between the motor shafts 29a, 30a and the shafts 25, 26, and the gear trains include the intermediate gears 33, 34. The shafts 25, 26 are rotated at a speed ratio of 1:1 with the motor shafts 29a and 30a, respectively. The drive motors 29, 30 are driven synchronously by a (not shown) control unit to rotate in the forward or reverse direction.

[0029] Shaft 25 is driven at both axial ends by two drive motors 29. Similarly, shaft 26 is driven at both axial ends by two drive motors 30. The drive motors 29 and 30 are driven synchronously, so that shafts 25 and 26 are driven synchronously. In other words, the two shafts 25 and 26 are driven by four motors. Thus, when using motors of the same power, it is possible to drive the tear-off rollers 10 and 11 with a torque that is twice that of the prior art. Since shafts 25 and 26 are continuously pivoted back and forth at high speed, for example at 300 rpm, they have greater torsion than if they were rotated in one direction at a constant speed. However, since both ends of the shafts 25, 26 are driven by the drive motors 29 and 26 respectively.When driven by 30, the amount of torsion is one quarter of the torsion produced in a structure where the shafts 25, 26 are driven only on one side.

[0030] Despite the synchronization of drive motors 29 and 30, they do not run perfectly in sync. A time delay of a few milliseconds was observed, meaning that the first drive motor in the rotation is always working against the torque of the second drive motor. This is compounded by play in the drive components, which is exacerbated by the time delay. This is particularly noticeable when the direction of rotation changes, as the first drive motor heats up more after the direction of rotation reverses and consequently has to work against the torque of the second drive motor, which has not yet completed the reversal.

[0031] According to the invention, the tear-off rollers 10, 11 are provided to be divided in the middle or off-center. This allows the drive motors 29, 30 to drive the tear-off rollers 10, 11 for, for example, 4 comb heads each in an 8-head machine, or 6 comb heads each in a 12-head machine, or 8 comb heads each in a 16-head machine. An asymmetrical division of the tear-off rollers 10, 11 is also possible, for example, a division for 1 and 7 comb heads, or 2 and 6 comb heads, or 3 and 5 comb heads.

[0032] In Figs. 3 and 3aThe two lower tear-off rollers 10, 11 are partially shown in a top view. For example, the tear-off rollers 10, 11 correspond to an embodiment for eight comb heads, such that the separation point 35 is located in the bearing area between the fourth and fifth comb heads. Each tear-off roller 10, 11 consists of the same number of separate roller sections as the number of comb heads, which are screwed together by means of threaded studs and threaded bores (not further specified) and permanently bonded with adhesive. For example, the third roller section 10c of the third comb head is connected to the fourth roller section 10d by a threaded stud in a threaded bore. Permanent fastening is achieved by bonding the thread. During the assembly of the roller sections 10c and 10d, a bearing shell 36 is simultaneously fitted over the connection point, which is mounted in the frame of the combing machine between the comb heads.This process is carried out analogously with two adjacent roller sections at a time, until the entire breaker roller 10 or 11 is assembled. In this embodiment, the breaker rollers 10, 11 are separated at the midpoint between comb heads four and five, with eight comb heads. To the left and right of the separation point 35, this results in two segments of the breaker roller 10, 11, which can be driven in opposite directions. At the separation point 35, both roller sections 10d and 10e or 11d and 11e are also connected by means of a bearing shell 37. Within the bearing shell 37, the end pieces or the shaft journals are supported in a rolling bearing 38, 39, which can be designed as a needle roller bearing.

[0033] This allows the connected roller sections 10a-10d and 11a-11d to rotate relative to the other connected roller sections 10e-10h and 11e-11h at the separation point 35 to any extent without the roller sections being subjected to an opposing torque. According to the invention, the separation point 35 is designed to compensate for any rotation of the roller sections, so that the two parts of the tear-off roller can be operated with different tear-off curves. In a continuous tear-off roller with a drive on both sides, if the drive motor is connected with a right-hand thread on one side and a left-hand thread on the other, the connections can loosen if the drive motors are not synchronized. This loosening is prevented by the shaft separation.

[0034] Dividing the lower tear-off rollers 10, 11 creates a torque balance between the drive motors 29, 30 on both sides, as the motors no longer work against each other, even with backlash in the gearboxes and the short time delay of synchronization. Torsion in the tear-off shafts 10, 11 is avoided, and the drive motors 29, 30 consume less energy. The overall power consumption of the combing machine is reduced, and the drive motors 29, 30 generate less heat, allowing for a higher number of comb cycles during continuous operation. The reduced torsion of the tear-off rollers results in less variance between the comb heads, leading to improved and more uniform fleece quality across all comb heads. The CV values ​​of the combed sliver become more uniform across all comb heads, consequently improving yarn quality, for example, through greater yarn uniformity.The achievable improvements depend on the loads acting on the breaker rollers. These loads vary with the number of comb heads, the breaker curves used, the set comb cycle count, and, among other things, the pressure of the upper breaker rollers 12, 13. The higher the loads, the greater the positive effect achieved by separating the breaker rollers.

[0035] The embodiment described here of the Figures 3 and 3a The design provides for two driven peel rollers 10, 11, each driven by two drive motors. Since the peel roller 10 closest to the gripper unit 5 has to handle the greatest drive load, energy savings would be achieved if only this peel roller 10 were split. The second peel roller 11, which can be driven by a different cam, can be designed as a continuous peel roller 11, as in the prior art.

[0036] Optionally, the second pair of tear-off rollers 11 can be driven with a different cam rotation than the first pair of tear-off rollers 10, so that a smoother motion is produced which also saves energy.

[0037] Conversely, only the second tear-off roller 11 can be divided. This roller can then also be driven differently on each section of the tear-off roller 11.

[0038] When the tear-off rollers 10, 11 are separated, it is possible that, for example, a higher strip number is produced for the rear fiber strips, as these are subject to greater distortion during the transport to the drawing unit.

[0039] Separating the tear-off rollers 10 and 11 allows individual sections of the combing machine, for example, four comb heads each, to be driven with different tear-off curves in order to achieve an optimum between nonwoven quality and energy consumption. Since the fiber ribbon 21 resulting from the comb heads furthest from the drafting unit enters the drafting unit with a higher degree of distortion, the split tear-off roller 10e-10h and 11e-11h with a different curve can be operated for these comb heads.

[0040] If the tear-off rollers 10, 11 are operated with different tear-off curves across the width of the combing machine, the upper, non-driven tear-off rollers 12, 13 may also have to be designed with the same pitch or separation, otherwise there may be increased wear of the tear-off rollers 10, 11, 12, 13 and distortion between the lower and upper tear-off rollers 10, 11 or 12, 13.

[0041] Of course, an off-center separation of the tear-off rollers 10, 11 is also possible. Independently of this embodiment, combing machines with only one tear-off roller are known, in which the soldering process takes place on a suction-fed belt or roller. This tear-off roller can also be separated centrally or off-center with a drive on both sides. Reference sign

[0042] 1 Cotton winding 2 Winding transport roller 3 Winding transport roller 4 Cotton belt 5 Clamping unit 6 Shaft 7 Feed cylinder 8 Circular comb 9 Fixed comb 10 First lower tear-off roller 10a - 10h Roller section 11 Second lower tear-off roller 11a - 11h Roller section 12 First upper tear-off roller 13 Second upper tear-off roller 14 Fiber web 15 Hopper 16 Discharge rollers 17 Gearbox 18 Motor 19 Control 20 Combing head 21 Fiber belt 24 Gearbox 25 Shaft 26 Shaft 27 Gear 28 Gear 29 Drive motor 29a Motor shaft 30 Drive motor 30a Motor shaft 31 Drive gear 32 Drive gear 33 Intermediate gear 34 Intermediate gear 35 Separation point 36 Bearing shell 37 Bearing shell 38 Rolling bearing 39 Rolling bearing

Claims

1. Combing machine, configured to produce combed fibres, having at least one combing head (20) with a feed device, the combing head (20) having at least one feed cylinder (7) which is configured to supply interconnected fibres from the feed device to a nipper unit (5) which is configured to clamp the interconnected fibres, and having at least one pair of detaching rolls (10, 12; 11, 13) which is configured to detach the clamped fibres from the nipper unit (5), wherein at least one detaching roll (10, 11) has a separation point (35) or that the at least one detaching roll (10, 11) is formed from two separate segments, characterized in that each pair of detaching rolls (10, 12; 11, 13) having a detaching roll (10, 11) that is driven from both sides by means of a drive, wherein the separation point (35) is formed in the region of a bearing point, to compensate for any twisting of the roll sections, or that the two separate segments are jointly mounted in the region of a bearing point so that the segments of a detaching roll can be operated simultaneously independently of one another.

2. Combing machine according to claim 1, characterised in that the segments of the at least one detaching roll (10, 11) are connected in the region of the separation point (35) by means of a bearing shell (37) which is configured to allow rotation of the segments in opposite directions.

3. Combing machine according to claim 2, characterised in that the adjoining segments of the at least one detaching roll (10, 11) are mounted by means of roller bearings (38, 39) inside the bearing shell (37).

4. Combing machine according to any one of the preceding claims, characterised in that the separation point (35) or the bearing of the separate segments is arranged symmetrically or asymmetrically between the combing heads.

5. Combing machine according to claim 1, characterised in that the associated upper detaching roll (12, 13) of the at least one detaching roll (10, 11) likewise has a corresponding separation point or is formed from two separate corresponding segments.

6. Combing machine according to any one of the preceding claims, characterised in that the detaching roll (10, 11) consists of a number of roll sections (10a-10h; 11a-11h) which corresponds to the number of combing heads.

7. Combing machine according to claim 6, characterised in that the roll sections (10a-10h; 11a-11h) are joined in the region of the bearing points of the at least one detaching roll (10, 11) by means of a threaded pin and a threaded bore and are mounted in bearing shells (36) over the connection points.

8. Combing machine according to claim 7, characterised in that the roll sections (10a-10h; 11a-11h) are non-detachably joined to one another, especially preferably adhesively bonded or soldered, in the region of the bearing points.

9. Combing machine according to any one of the preceding claims, characterised in that only one of the two detaching rolls (10, 11) has a separation point (35), or the at least one detaching roll (10, 11) is formed from two separate segments.

10. Combing machine according to any one of the preceding claims, characterised in that only the first detaching roll (10) has a separation point (35) or is formed from two separate segments.

11. Combing machine according to any one of the preceding claims, characterised in that both detaching rolls (10, 11) have a separation point (35), or the two detaching rolls (10, 11) are formed from two separate segments, and both detaching rolls (10, 11) and / or the separate segments thereof are driven with different detaching curves.

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