Method of operating a combing machine for textile preparation and combing machine

Abstract

The invention relates to a method for operating a combing machine (100) for textile preparation, having a rotationally driven circular combing roller (1), through which a fibre strand (10) is guided in a periodic sequence in order to comb out the fibre strand, having an upper nipper plate (2) and a lower nipper plate (3), by means of which the fibre strand (10) to be combed out is clamped and released again in a periodic sequence, having a rotationally driven front separating roller (4) and a rotationally driven rear separating roller (5), wherein the separating rollers (4, 5) are rotated back and forth in the form of a Pielou motion with reversal points (U1, U2) configured therefor, and wherein the fibre strand (10) is separated in a periodic sequence at least by means of the front separating roller (4). According to the invention, the rear separating roller (5) is rotationally driven with a phase (P2) which is behind the phase (P1) of the rotationally driven front separating roller (4) between the reversal points (U1, U2).

Description

TECHNICAL FIELD

[0001] The invention relates to a method for operating a combing machine for textile preparation, which has a rotationally driven circular combing roller through which a fibre bundle is guided in a periodic sequence in order to comb out the fibre bundle, which has an upper and a lower nipper plate by means of which the fibre bundle to be combed out is clamped in a periodic sequence and released again, which furthermore has a rotationally driven front separating roller and a rotationally driven rear separating roller, wherein the separating rollers are rotated back and forth in the form of a pirouette movement in the case of a reversal point being configured, and wherein the fibre bundle is separated in a periodic sequence at least by means of the front separating roller. BACKGROUND

[0002] A combing machine of this type for textile preparation is known, for example, from DE 10 2012 011 030 A1 and the front separating roller and the rear separating roller are driven by a common control drive, wherein, for the drive, a first motor for a continuous rotary movement and a second motor for a superimposed, discontinuous rotary movement are applied in order to produce a pirouette movement. For this purpose, the separating rollers are driven by a planetary gear drive and the separating rollers are rigidly connected in their rotary phase on the driven side of the planetary gear drive, so that both separating rollers likewise perform a corresponding strong acceleration and retardation of the rotary movement. By the pirouette movement, some large rotary accelerations are produced, which, due to the synchronous rotary movement of the rollers, are not transformed into one another, so that a great energy requirement arises for the synchronous operation of the separating rollers in the combing head of the combing machine in the form of a pirouette movement.

[0003] From EP 2 444 534 B1, a method for operating a combing machine for textile preparation is known, wherein it is proposed that, by means of the application of a control unit having a calculation unit and an input unit, the movement curve in time of the separating rollers is to be established in the simplest possible manner and by giving scattered reversal points. The pirouette movement can be performed accordingly after inputting the scattered reversal points and the auxiliary points in between, in that the servo motor is controlled as required according to the curve progression.

[0004] However, the separating rollers are driven and retarded with large accelerations without variation, so that likewise by means of the programming of the auxiliary points in the pirouette movement already described, a large energy requirement is produced without variation in the operation of the combing machine. SUMMARY

[0005] It is the task of the invention to further improve the operation of the combing machine by reducing the energy requirement of the combing machine. The length exerted on the combed fibre bundle in the time unit should here be kept as constant as possible.

[0006] The task is solved by the method according to the preamble of claim 1 and in combination with the features indicated. Advantageous variants of the application are given in the dependent claims.

[0007] The technical teaching underlying the application consists in driving the rear separation roller in phase rotationally behind the phase of the front separation roller at the reversal points of the plectonemic motion.

[0008] The separation process for separating the fiber bundle is carried out only or predominantly by the front separation roller, wherein the rear separation roller is necessary only for guiding the fiber bundle and also for exerting at least partial forces on the fiber bundle, in particular when the fiber bundle is again joined together. The situation in which the fiber bundle is again joined together is referred to as the so-called joining. Therefore, the additional rear separation roller is essentially necessary in order to reinforce the fiber bundle that is again joined together in the joining position by the fiber bundle traversing the rear separation roller in the plectonemic motion also several times.

[0009] If the rear separation roller is operated in a manner according to the application between the reversal points more slowly by at least a phase-wise smaller change in the rotational speed over time, this means that energy savings can be achieved thereby. The reason for this is the less "violent" reversal movement of the roller before and after the reversal points and the "gentler" change in the rotational speed. The phase of the separation roller is then again in agreement at the reversal points, whereas the front separation roller experiences a more intensive change in the rotational speed per time unit compared to the rear separation roller, in particular with regard to the curve progression before and after the reversal points. By this, energy can be saved by the less energy-intensive operation of the rear separation roller, in particular also by the operation of the motor near the ideal operating point.

[0010] Advantageously, the rear separation roller is operated with a maximum rotational acceleration between the reversal points that is smaller than the maximum rotational acceleration of the front separation roller. In other words, the curve of the phase of the rear separation roller has a smaller slope over time than the curve of the phase of the front separation roller. The maximum slope of the curve of the phase of the front separation roller is in particular greater than the maximum slope of the curve of the phase of the rear separation roller.

[0011] By this, the change in the rotational speed per time unit of the rear separation roller can be smaller than the change in the rotational speed per time unit of the front separation roller before and / or after a phase period through the reversal points.

[0012] According to a further advantageous design of the method according to the application, the front separating roller and the rear separating roller are driven separately from one another by means of motorized drives. The advantage resulting therefrom is that a control unit can be provided by means of which the motorized drives of the front separating roller and the rear separating roller can be controlled separately from one another. It is particularly advantageous if the motorized drives of the front separating roller and the rear separating roller are not connected to one another by means of a transmission. A further advantage is that the motorized drive of each separating roller is disconnected from the drives of the remaining rotating components of the combing machine. The separating rollers can comprise a rotation angle sensor by means of which the rotational position of the roller can be transmitted to the control unit at any time in order to control the roller accordingly by means of a phase-regulated loop. The separating rollers can in particular be configured by means of a rotor of an electric motor or have a torque-proof connection to a rotor of an electric motor, so that they can be controlled electrically and in particular in an electrically regulated loop, alone and in particular with a very dynamic curve of the phase of the separating roller.

[0013] According to an important aspect of the application, the phase of the rear separating roller deviates from the phase of the front separating roller in such a way that the sections of the fiber strand between the separating rollers are configured in a periodic sequence to reproduce a loop. The loop can here likewise be configured as a further straight extension of the fiber strand and in a certain sense as an abstract form of the loop, but in which the fiber strand in the sections between the separating rollers is not under tensile stress or in which the tensile stress in the fiber strand between the separating rollers occurs as a pulsating repeated tensile fatigue force as long as the tensile force is substantially > 0. By means of the deviating phase of the rear separating roller, the loop of the fiber strand is preferably at least to a small extent configured between the separating rollers, whereas the loop already exists when the fiber strand no longer forms a straight line between the separating rollers.

[0014] The motorized drive of the rear separating roller is operated with a smaller average power and / or with a smaller maximum power during a Pielstick cycle than the motorized drive of the front separating roller. Smaller overall necessary energy requirements are thereby obtained, wherein the front separating roller must adhere to the process-relevant phase in order to coordinate the combing procedure and the separating process, the combing-out and the engagement process of the phases of the other rotating components of the combing head of the combing machine for each combing cycle (Kammspiel).

[0015] The application furthermore relates to a combing machine for textile preparation, which has a control unit by means of which the combing machine can be operated in accordance with the aforementioned method. The combing machine has in particular a first motorized drive and a second motorized drive, and the first motorized drive drives the front separating roller and the second motorized drive drives the rear separating roller, wherein the motorized drives are configured separately from one another and can be controlled by the control unit of the combing machine. BRIEF DESCRIPTION OF DRAWINGS

[0016] Further measures for improving the application are shown in the following description of preferred embodiments of the application together with the drawings.

[0017] In the drawings:

[0018] Fig. 1 shows a schematic view of a gill box according to the prior art,

[0019] Figure 2 a diagram showing a gill box according to Fig. 1 with features according to the application, and

[0020] Figure 3 a diagram showing the curve progression of the phase of the front separating roller and the phase of the back separating roller over time. DETAILED DESCRIPTION

[0021] The foregoing description of the solution according to the application thus includes, inter alia, various feature combinations defined by the subsequently consecutively numbered embodiments:

[0022] 1. Method for operating a gill box (100) for textile preparation, the gill box having a rotationally driven cylinder roller (1), through which a fibre strand (10) is guided in a periodic sequence in order to be combed out, the gill box further having an upper nipper plate (2) and a lower nipper plate (3), by means of which the fibre strand (10) to be combed out is clamped in a periodic sequence and released again, the gill box furthermore having a rotationally driven front separating roller (4) and a rotationally driven back separating roller (5), wherein the front separating roller (4) and the back separating roller (5) are rotated back and forth in the form of a Pielou motion with reversal points (Ul, U2) being configured, and wherein the fibre strand (10) is separated in a periodic sequence at least by means of the front separating roller (4), wherein the back separating roller (5) is rotationally driven with a phase (P2) which is subsequent to the phase (PI) of the rotationally driven front separating roller (4) between the reversal points (Ul, U2), wherein the phase (PI) of the front separating roller (4) and the phase (P2) of the back separating roller (5) coincide again at the reversal points (Ul, U2).

[0023] 2. Method according to embodiment 1, wherein the back separating roller (5) is operated with a maximum rotational acceleration between the reversal points (Ul, U2) which is smaller than the maximum rotational acceleration of the front separating roller (4) between the reversal points (Ul, U2).

[0024] 3. The method according to claim 1 or 2, wherein the rotational speed change per time unit of the back doffer (5) is less than the rotational speed change per time unit of the front doffer (4) before and / or after passing the phase (P1, P2) by one reversal point (U1, U2).

[0025] 4. The method according to any one of claims 1 to 3, wherein the front doffer (4) is driven individually by means of a motorized drive (6) assigned to the front doffer (4) and the back doffer (5) is driven individually by means of a motorized drive (7) assigned to the back doffer (5).

[0026] 5. The method according to any one of the preceding claims, wherein the phase (P2) of the back doffer (5) is offset from the phase (P1 ) of the front doffer (4) such that sections of the fiber strand (10) are configured between the front doffer (4) and the back doffer (5) in a periodically recurring loop (S).

[0027] 6. The method according to any one of the preceding claims, wherein the motorized drive (7) of the back doffer (5) is operated with less average power and / or with less maximum power during a Pielou cycle than the motorized drive (6) of the front doffer (4).

[0028] 7. A combing machine (100) for textile preparation, having a rotationally driven circular combing roller (1 ) which is configured for combing out a fiber strand (10) in a periodically recurring sequence, having an upper nipper plate (2) and a lower nipper plate (3) which are configured for clamping and releasing again the fiber strand (10) to be combed in a periodically recurring sequence, having a rotationally driven front doffer (4) and a rotationally driven back doffer (5), wherein the front doffer (4) and the back doffer (5) are for rotating back and forth in the form of a Pielou movement with reversal points (U1, U2) configured, and having a control unit (8) by means of which the combing machine (100) can be operated according to the method of any one of the preceding claims.

[0029] 8. The combing machine (100) according to claim 7, wherein the front doffer (4) has a first motorized drive (6) and the back doffer (5) has a second motorized drive (7), which motorized drives are configured to be controllable separately from one another by the control unit (8).

[0030] Fig. 1 and Figure 2A combing machine 100 in the region of a combing head is shown, all features of the combing head according to Fig. 1 of the prior art are shown and all features of the combing head according to Fig. 2 of the present application are shown Figure 2 All features of the combing machine 100 according to Fig. 1 and Figure 2 of the present application are described in the following together.

[0031] The combing machine 100 according to Fig. 1 and Figure 2 is shown with a combing head for the combing out of a fiber mass 10, which can also be called a fiber web or a cotton. The fiber mass 10 is stored in a fiber lap 17 or in an uncombed state in a not shown can and the fiber lap 17 is accommodated on two lap rollers 18, 19. By means of the rotation of the lap rollers 18, 19 the fiber lap 17 is unwound and delivered to the combing head.

[0032] First, the fiber mass 10 is delivered by means of a feed cylinder 11 and then to a nipper device comprising an upper nipper plate 2 and a lower nipper plate 3. The upper nipper plate 2 and the lower nipper plate 3 release the fiber mass 10 in a state in which the nipper plates 2, 3 are open and the fiber mass can move outwardly by means of the front output side of the nipper device. In the shown phase of the combing machine 100 the fiber mass 10 enters directly into a front separating roller 4, by means of which the fiber mass 10 is clamped to some extent between the front separating roller 4 and a counter separating roller 15 and the fiber mass 10 is finally guided between the front separating roller 4 and the front counter separating roller 15.

[0033] In the further course of the fiber mass 10 this fiber mass enters this time a further back separating roller 5 and is clamped between the back separating roller 5 and a back counter separating roller 16. For further use the fiber mass 10 then enters a delivery roller pair 20 and is thus further transported, for example for further processing in a drawing frame.

[0034] In order to control the upper and lower nipper plates 2, 3 in their movement accordingly, a nipper plate arm 12 is provided, on which the lower nipper plate 3 is hinged, and which is mounted on a nipper plate shaft 13 which performs a periodic back-and-forth movement. The upper nipper plate 2 is likewise driven in an unshown manner and releases the fibre strand 10 in the shown phase of the combing head. If the combing head is driven back by the front nipper plates 2, 3 passing through the plane of the drawing to the left away from the front separating roller 4, the fibre strand is briefly separated by the separating action before the front separating roller 4, and a further section of the fibre strand 10 is released by the feed roller 11. The fibre fluff released in this way reaches the return position of the combing head with its free length by the rotationally driven circular comb roller 1, and the combing arc 14 present on the circular comb roller 1 combs the fibre fluff. The combing head then again drives to the left towards the front separating roller 4 and the rear separating roller 5, which in this phase move the combed fibre strand 10 back towards the nipper plates 2, 3 by a section, so that the newly combed fibre strand can be joined together with the fibre strand driven back from the front separating roller 4.

[0035] The fibre fluff combed by the combing arc 14 is here placed in an overlapping manner on the end section of the fibre strand 10 guided back, and is drawn into the clamping position of the first front separating roller 4 in connection with the front counter separating roller 15 in order to be joined together with this fibre strand. The front separating roller 4 and the rear separating roller 5 are then turned forward by a larger angle, so that a larger section of the fibre strand 10 is guided towards the delivery roller pair 20.

[0036] In this respect, the front separating roller 4 and the rear separating roller 5 must be turned back by a predetermined phase angle in each combing cycle, and then turned forward again by a further, larger predetermined phase angle, so that the fibre strand 10 is transferred to the delivery roller pair 20 by the forward turning. This movement is called a Pielmorer movement.

[0037] The prior art according to Fig. 1 is provided with a drive unit 9 which co- drives the front separating roller 4 and the rear separating roller 5 in the same phase. The operation of the rollers can take place by means of a first motor-type drive which conducts a continuous rotation into a roller transmission, and a second motor-type drive which superimposes a non-continuous rotational movement into the continuously driven transmission, for example a planetary gear transmission. By this, a Pielmorer movement is produced which can be varied by different control of the electric drives.

[0038] According to Figure 2The inventive separating rollers 4, 5 are each assigned a separate motorized drive 6, 7, and the motorized drive 6 drives only the front separating roller 4 and the second motorized drive 7 drives only the rear separating roller 5. The counter-roller 15 rotates together with the driven front separating roller 4 by contact and the counter-roller 16 rotates together with the driven rear separating roller 5 by contact.

[0039] A control unit 8 is provided for controlling the motorized drives 6, 7, which control unit can have an input / output interface in a manner not further shown, so that an operator can program the gill motion via the control unit 8.

[0040] According to the invention, the rear separating roller 5 is driven rotationally in a phase which follows the phase of the front separating roller 4 which is driven rotationally. By this, a loop S can be constructed between the front separating roller 4 and the rear separating roller 5, which loop is drawn out of the fiber strand 10 by each combing cycle by the straight extension of the fiber strand between the front separating roller 4 and the rear separating roller 5, especially under the application of a small tensile stress, and the loop S is reconstructed in the following combing cycle. The loop S is always constructed here between the reversal points of the phase course of the rotational movement of the front separating roller 4 and the rear separating roller 5, wherein the front separating roller 4 runs with a greater angular acceleration between the reversal points than the rear separating roller 5. By this, the fiber strand 10 is guided through a greater section by the front separating roller 4 than by the rear separating roller 5.

[0041] It is also conceivable that the front separating roller 4 and the rear separating roller 5 are driven by means of a common drive and the different rotational phase courses are produced by a rigid or in certain cases variable transmission connection to one another, either manually or automatically.

[0042] Figure 3 A diagram is shown which shows the rotational angle of the front separating roller 4 and the rear separating roller 5 as a function of the running time t in milliseconds. The phases Pl, P2 show a typical course of the gill motion, especially with reversal points Ul, U2, wherein only one combing cycle is shown. The continuity of the combing cycle continues the rotational angles al, a2 continuously, so that the curve course always continues in a certain manner in a concatenated manner.

[0043] The diagram shows the deviation of the phase Pl, P2 of the rotational movement in time of the front separating roller 4 and the rear separating roller 5, wherein the phase Pl describes the phase course in time of the front separating roller 4 and the phase P2 describes the phase course in time of the rear separating roller 5.

[0044] It can be seen after the first reversal point U1 that the phase Pl of the front separating roller 4 and the phase P2 of the rear separating roller 5 are offset from one another. The offset is formed in such a way that the maximum change in rotational speed per time unit of the rear separating roller 5 is less than the maximum change in rotational speed per time unit of the front separating roller 4. By this, energy for operating the rear separating roller 5 is saved, while the front separating roller 4 passes through the phase Pl in time which is necessary for the process level and which is prescribed for the actual combing process. By the phase P2 of the rear separating roller 5 being up to 10% of the rotational speed difference of the front separating roller 4 behind the phase Pl of the front separating roller 4, a more gentle, smooth phase profile is produced, in which the phases Pl, P2 coincide again at the reversal points U1, U2. Here, in particular the angular velocity, the angular acceleration of the phase profile of the rear separating roller 5 relative to the front separating roller 4 varies over the combing cycle. Different power consumption of the motorized drives 6, 7 occurs, wherein the motorized drive 7 of the rear separating roller 5 can have a power consumption which is up to 20% less than the motorized drive 6 of the front separating roller 4.

[0045] The application in its implementation aspects is not limited to the previously preferred embodiments. Rather, a number of variants are conceivable which can likewise be used in fundamentally differently embodied implementations from the solutions shown. All features and / or advantages derived from the embodiments, the description or the drawings, including structural details or spatial arrangements, can be embodied on their own and / or in different combinations.

[0046] List of reference signs

[0047] 100 combing machine

[0048] 1 circular combing roller

[0049] 2 top nipper

[0050] 3 bottom nipper

[0051] 4 front separating roller

[0052] 5 rear separating roller

[0053] 6 motorized drive

[0054] 7 motorized drive

[0055] 8 control unit

[0056] 9 drive unit

[0057] 10 fiber strand

[0058] 11 feed cylinder

[0059] 12 clamp arm

[0060] 13 clamp shaft

[0061] 14 circular comb segment

[0062] 15 front pair of separating rollers

[0063] 16 back pair of separating rollers

[0064] 17 fiber lap

[0065] 18 winding roller

[0066] 19 winding roller

[0067] 20 delivery roller pair

[0068] α1 angle of rotation

[0069] α2 angle of rotation

[0070] P1 phase of front separating rollers

[0071] P2 phase of back separating rollers

[0072] U1 first reversal point

[0073] U2 second reversal point

[0074] S ring

Claims

1. A method for operating a combing machine (100) for textile preparation, the combing machine having a rotary-driven circular combing roller (1) through which fiber bundles (10) are guided in a periodic sequence for combing out, the combing machine also having an upper clamping plate (2) and a lower clamping plate (3) by means of which the fiber bundles (10) to be combed out are clamped in a periodic sequence and released again, the combing machine further having a rotary-driven front separating roller (4) and a rotary-driven rear separating roller (5), wherein, The front separating roller (4) and the rear separating roller (5) rotate back and forth in a Pierce motion with reversal points (U1, U2) constructed therein, wherein the fiber bundle (10) is separated in a periodic sequence at least by means of the front separating roller (4), characterized in that the rear separating roller (5) is rotated with a phase (P2) which is after the phase (P1) of the rotating front separating roller (4) between the reversal points (U1, U2), wherein the phase (P1) of the front separating roller (4) and the phase (P2) of the rear separating roller (5) re-align at the reversal points (U1, U2).

2. The method according to claim 1, characterized in that, The rear separation roller (5) operates with the maximum rotational acceleration between the reversal points (U1, U2), which is less than the maximum rotational acceleration of the front separation roller (4) between the reversal points (U1, U2).

3. The method according to claim 1, characterized in that, Before and / or after passing through the phases (P1, P2) at a reversal point (U1, U2), the rotational speed change of the rear separation roller (5) per unit time is less than the rotational speed change of the front separation roller (4) per unit time.

4. The method according to claim 2, characterized in that, Before and / or after passing through the phases (P1, P2) at a reversal point (U1, U2), the rotational speed change of the rear separation roller (5) per unit time is less than the rotational speed change of the front separation roller (4) per unit time.

5. The method according to any one of claims 1-4, characterized in that, The front separating roller (4) is driven independently by a motor-driven unit (6) associated with the front separating roller (4), and the rear separating roller (5) is driven independently by a motor-driven unit (7) associated with the rear separating roller (5).

6. The method according to any one of claims 1-4, characterized in that, The phase (P2) of the rear separating roller (5) is offset from the phase (P1) of the front separating roller (4), such that a segment of the fiber bundle (10) is constructed between the front separating roller (4) and the rear separating roller (5) in a periodically repeating sequence of loops (S).

7. The method according to claim 5, characterized in that, The phase (P2) of the rear separating roller (5) is offset from the phase (P1) of the front separating roller (4), such that a segment of the fiber bundle (10) is constructed between the front separating roller (4) and the rear separating roller (5) in a periodically repeating sequence of loops (S).

8. The method according to any one of claims 1-4 and 7, characterized in that, Compared to the motor drive unit (6) of the front separation roller (4), the motor drive unit (7) of the rear separation roller (5) operates with a lower average power and / or a lower maximum power during the Pierce cycle.

9. The method according to claim 5, characterized in that, Compared to the motor drive unit (6) of the front separation roller (4), the motor drive unit (7) of the rear separation roller (5) operates with a lower average power and / or a lower maximum power during the Pierce cycle.

10. The method according to claim 6, characterized in that, Compared to the motor drive unit (6) of the front separation roller (4), the motor drive unit (7) of the rear separation roller (5) operates with a lower average power and / or a lower maximum power during the Pierce cycle.

11. A combing machine (100) for textile preparation, comprising a rotary-driven circular combing roller (1) configured to comb out fiber bundles (10) in a periodic sequence, the combing machine further comprising an upper clamping plate (2) and a lower clamping plate (3) configured to clamp the fiber bundles (10) to be combed out in a periodic sequence and release them again, the combing machine further comprising a rotary-driven front separating roller (4) and a rotary-driven rear separating roller (5), wherein, The front separating roller (4) and the rear separating roller (5) are used to rotate back and forth in a Pierce motion when reversal points (U1, U2) are constructed. The comber also has a control unit (8) by means of which the comber (100) can be operated by any one of claims 1-10.

12. The combing machine (100) according to claim 11, characterized in that, The front separation roller (4) has a first motor drive unit (6) and the rear separation roller (5) has a second motor drive unit (7), and these motor drive units are configured to be separate from each other and can be controlled by the control unit (8).

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