EP2913428A1 - Combing machine with a web-forming device - Google Patents

Abstract

The invention relates to a device (13) for forming a fiber fleece (V) from fiber packets (F), which are fed by a take-off device (9, 11) of a combing unit of a comber of the device (13), with one, on an axis (16) rotatably mounted sieve drum (15), wherein in an operating position of the device, connected to the sieve drum drive element (Z1) is coupled to a first drive means (Z2) and arranged with a front side at one end of the sieve drum (15), suction duct (25) attached to the machine frame (MG) of the combing machine and airtightly connected to one end with a negative pressure source (D) and other ends in the operating position with the inner space (IR) of the screening drum. In order to obtain a good accessibility for keeping the device clean it is proposed according to the invention that the axis (16) on which the sieve drum (15) is mounted is fastened at its ends to pivot arms (S1, S2) which are at a parallel distance from each other Have axis (16) has a pivot axis (32), via which they are pivotally mounted on the machine frame (MG) and the device (13) via the pivot arms (S1, S2) into an inoperative position can be transferred, in which the drive connection between the drive element ( Z1) of the screen drum (15) and the first drive means (Z2) is released and the airtight connection between the suction channel (25) and the interior (IR) of the screen drum is so separated, so that ensures free access to the interior (IR) of the screen drum becomes.

Description

The invention relates to a device for forming a fiber mat of fiber packets, which are supplied from a take-off device of a combing unit of a comber of the device, with a rotatably mounted on an axis screen drum, wherein in an operating position of the device, connected to the screen drum drive element is coupled to a first drive means and with a, arranged at one end of the screen drum, attached to the machine frame of the comber suction duct, the one end with a vacuum source (D) and other ends in the operating position airtight connected to the interior (IR) of the screen drum is.

Such a device is for example from the WO-2006/012759 in which, following a combing device, the fiber tuft of a fiber material presented and combed out by a nipper unit is withdrawn from a take-off device (eg from tear-off rollers) and fed stepwise to a subsequent device for forming a fiber fleece. In the present example, individual fiber packets are placed stepwise on the peripheral surface of a driven screen drum. The interior of the screen drum is connected via a frontally mounted on the screen drum suction channel with a vacuum source in combination. By means of the negative pressure applied in the interior of the screen drum, on the one hand the already formed nonwoven fabric is held on the circumferential surface of the screen drum and on the other hand the rear end of the newly supplied fiber packet is laid like a tile on the end of the fiber web and soldered to it. In order to be able to precisely control this process (sweeping and laying of the fiber package by air flows), a driven control means is provided within the screen drum, which consists, for example, of a drum rotatably mounted coaxially with the screen drum, which has openings on its circumference. About these openings, which arrive in coordination with the Kammspielzahl in the field of Ansetzstelle (solder joint), the vacuum required there is controlled. In addition, even more stationary shields can be provided within the sieve drum. This is particularly advantageous in the area in which the nonwoven fabric formed on the screen drum is removed, in order to subsequently to form a fiber ribbon from the nonwoven fabric. Different devices may be provided for this decrease. In the cited WO'759 z. B. two deduction departments provided while in the exemplary embodiment of the pre-published EP-2 486 176 B1 a calender roll is used, which cooperates with another co-axially mounted on the screen drum calender roll to deliver the combined on the screen drum nonwoven fabric as a sliver to a subsequent sliver funnel.

To support the soldering a pivotable flap is mounted in the known designs in the field of Ansetzstelle (transfer point). The pivoting movement of this flap is synchronous with the movement of the combing unit, or with the movement of the control means within the screen drum.

The resulting, during operation fiber fly, as well as dust and other contaminants, deposits may occur in the Ansetzstelle as well as within the screen drum, which interfere with the necessary air circulation, or air currents to achieve optimum soldering.

For example, can be clogged by contamination, the through holes of the screen drum.

Therefore, it is necessary that at certain time intervals a cleaning of the screen drum and the area of the transfer point is made in order to maintain an optimal function of the device. In the known designs time-consuming disassembly work is necessary to perform this cleaning.

It is therefore the object of the invention to further develop the known devices, or to improve, so that a good and quick accessibility to the nonwoven fabric forming device is ensured in order to perform the necessary cleaning intervals optimally and without long downtime periods of the combing. The term "optimal" means that access to the sites to be cleaned is made possible so that a complete cleaning can take place.

This object is achieved in that it is proposed that the axis on which the screen drum is mounted, is fastened at its ends to pivot arms which have a pivot axis at a parallel distance from the axis, via which they are pivotally mounted on the machine frame and the device via the pivot arms in an inoperative position is transferred, in which the drive connection between the drive element of the drum and the first drive means is released and the airtight connection between the suction channel and the interior of the drum is so separated Free access to the interior of the screening drum is ensured.

With this proposed embodiment, a free access to the inner region of the screen drum and also to the transfer area is made possible when the device has been pivoted via the pivot arms into an inoperative position. The simultaneous decoupling of the drive for the sieve drum ensures that the cleaning is carried out safely only when the sieve drum is stationary.

However, it is also a device according to the invention conceivable, wherein the drive connection between the drive and the drive element of the screen drum during pivoting into the inoperative position is not separated. In this case, the drive connection must be matched to the pivoting movement of the screen drum and adjusted accordingly.

By pivoting the sieve drum over the pivot arms in an inoperative position (which can be fixed by an end stop), the connection between the suction channel and the drum is released and thus allows free access to the interior of the drum for cleaning.

Furthermore, it is proposed that a control means, which is rotatably mounted on the axis within the sieve drum, be arranged, which has a drive element which is arranged outside the sieve drum and coupled to a second drive means in the operating position and decoupled in the inoperative position.

To achieve the inoperative position, the device is swung out by its pivot arms in a fixed position in which the free access to the inner region of the drum and thus also to the control means can take place from the front side of the drum, on which the suction channel rests sealingly in operation.

Advantageously, it is further proposed that the pivot arms are mounted on a common frame which has a common pivot axis for the

Has pivot arms. This allows a compact and stable construction and a synchronous pivoting of the pivot arms.

It is further proposed that the control means and the drive element of the control means are mounted on a projecting into the sieve drum hollow shaft, and the hollow shaft is rotatably supported by bearing elements on the axis.

Thus, a simple assembly of the screen drum and the control means on the shaft is made possible, with a quick disassembly of the individual parts is also guaranteed for cleaning and replacement. In this case, preferably, the screen drum is rotatably mounted at least at one of its ends via a bearing element on the hollow shaft.

In order to ensure the concentricity of the mounted on only one end screen drum, it is further proposed that the screen drum on the opposite end of the bearing element in the radial direction on a guide element (support member) is supported, which is mounted on the axle.

In order for the angular position of the control means in the transfer from an inoperative position to the operating position with respect to the elements involved in comb play (eg, circular comb, pliers, tearing cylinder, hinged flap) can be exactly aligned, it is proposed that for adjustment the position of the angle of rotation of the control means are provided markings on the control means or connected to the control means elements, which faces at least one mark on a pivoting arm.

In order to be able to carry out a simple and secure coupling and end coupling of the drives, it is proposed that the drive element connected to the sieve drum and the first drive means which can be coupled to the drive element be designed as toothed wheels. For the same reason, it is further proposed that the drive element connected to the control element and the second drive means which can be coupled to the drive element are designed as toothed wheels.

In order to keep the pivot arms and thus the device for fiber web formation in its operating position safely, it is proposed that a locking device be provided in the region of the pivot arms in order to fix the device in its operating position.

For fixing the device in an inoperative position, an end stop can be provided. It would also be possible to provide a lock for the inoperative position.

In order to obtain an airtight connection between the suction channel and the interior of the screen drum in the operating position, it is proposed that the suction channel is provided in the region of its, directed towards the open end of the screen drum outlet opening with a circumferential seal, which in the operating position on a surface of a supported with a passage opening pivot arm supported.

For easy release of the airtight connection before swinging the screen drum in an inoperative position is further proposed that the suction channel is mounted movable in the axial direction to the axis in a guide via an adjusting means.

Air-tight connection means that in the area of the coupling point in the operating position no air from the environment (external air) in the encapsulated inner area of the suction drum and the suction channel.

Further advantages of the invention will be shown and described in more detail in subsequent embodiments.

Fig.1

eine schematische Seitenansicht einer Kämmvorrichtung einer Kämmmaschine mit einer schwenkbar angebrachten Siebtrommel zur Faservliesbildung

Fig.2

eine vergrösserte Schnittdarstellung A-A der Siebtrommel nach Fig.1

Fig.3

eine schematische Draufsicht X nach Fig.1

Fig.4

eine Teilansicht Y nach Fig.3 ohne Saugkanal

Fig.5

eine weitere Ausführungsform nach Fig.3

Show it:

Fig.1

a schematic side view of a combing a combing machine with a pivotally mounted screen drum for fiber web formation

Fig.2

an enlarged sectional view AA of the screen drum after Fig.1

Figure 3

a schematic plan view X according to Fig.1

Figure 4

a partial view Y after Figure 3 without suction channel

Figure 5

a further embodiment according to Figure 3

Fig. 1 shows a partial view of a combing head 1 of a combing machine, wherein the size ratios of the individual elements are not representative of each other.

As shown schematically, the combing head 1 a nipper unit 2 (called "pliers" for short), which fiber material W is supplied in the form of a cotton or in the form of slivers. Within the forceps 2, a feed cylinder 3 is rotatably mounted, via which the fiber material gradually a nip K of the forceps is supplied. As is known, the forceps consists of a lower forceps plate P1 and an upper forceps plate P2, which, as indicated schematically by a double arrow, is pivotally mounted to the lower tong plate P1. At its front end, the pliers 2 on a nip K, when the pliers is closed. In the example shown, the forceps 2 is opened and the tuft protruding from the tuft FB of the fiber W is clamped in a nip P between a tear roller 11 and a tear segment 9 of a rotatably mounted below the forceps circular comb 5. The circular comb 5 is rotatably supported by an axis 6 in the machine frame and connected to a gear G which is driven by a motor M.

About the, on the circumference of the circular comb 5 mounted Kämmsegment 8 previously the tuft FB, which protruded with closed pliers from the nip K, combed out.

In the example shown, the device is in a tear-off position, wherein over the clamping point P a fiber package F is withdrawn from the fiber tuft FB and for web formation, or for the soldering process in the region of a transfer point S is transferred to a subsequent web-forming device 13. To support the soldering process of the withdrawn fiber package F or for attaching the rear end of the fiber package F to the end of an already formed fiber web V, in the transfer area S, a flap 23 pivotable about an axis 23 is attached.

In the WO 2006/012759 A1 the transfer and soldering process using such a flap 22 is shown and described in detail, to which reference is hereby made.

The web-forming device 13 consists of a rotatably mounted screen drum 15, on the peripheral surface U, the formed fiber web V is guided and held. In order that the nonwoven fabric V is held on the outer circumference U of the screening drum up to a take-off point B, the sieve drum 15 has openings L which, as shown schematically in the enlarged sectional view AA of FIG Fig.2 is shown, extend over the peripheral surface U. The interior IR of the screen drum 15, in which the openings L protrude, is connected to a vacuum source D in combination.

How out Fig.2 can be seen, the sieve drum 15 is pot-shaped, wherein it is rotatably mounted at its closed end E1 via a bearing 20 on a hollow shaft 18. The hollow shaft 18 is rotatable on a fixed shaft 16 via the bearings L1 and L2 stored. The shaft 16 is fixedly connected at its ends with pivot arms S1, S2 respectively. As in particular from the Figure 3 (Top view X after Fig.1 ), the pivot arms S1, S2 at a parallel distance from the shaft 16 on an axis 32, via which they are pivotally mounted on the machine frame MS. The pivot arms are connected via a cross member 30 with each other.

In order to guide the screen drum also in the region of its open end E2 in the radial direction, an annular support member 28 is mounted on the shaft 16 via a hub 27 in this area. The annular support member 28 is connected via webs H to the hub 27, whereby a sufficient space 72 is provided for the air passage. The screen drum projects beyond the outer circumference of the support element 28 with its inner surface and can rest on it during its rotation in the radial direction.

The pivot arm S2, which is directly adjacent to the support member 28, is fixedly connected to the shaft 16 and also has like the support member 28 an annular shape to a sufficient clearance - passage opening 70 - to ensure the air passage (as shown schematically by arrow) , As seen from the view Y ( Figure 3 ) in Figure 4 can be seen, the swivel arm S2 in the region of its attachment to the shaft 16 an annular flange 35 which is supported by webs E on a hub 36 which is fixedly connected to the shaft 16. The above-described webs H of the support member 28 are preferably - seen in the circumferential direction - in the same position as the webs E of the annular flange 35 is mounted.

On the - viewed in the axial direction of the shaft 16 - outwardly facing surface 33 of the annular flange 35 is in operating position sealing an endless seal 24, which is fixed to a suction channel 25. The suction channel 24 is attached to the machine frame MG via fastening means, not shown, and via a line (hose) 26 to a vacuum source D in combination. About the vacuum source D, the required negative pressure in the interior IR of the screen drum 15 is generated, which is necessary for web formation.

As further from the embodiment of Figure 5 can be seen, the suction channel 25 is fixed to a holder HA, which - seen in the axial direction of the axis 16 - between two fixed to the machine frame MG guides 64, 65 slidably is appropriate. In order to carry out this displacement, a pressure cylinder ZL is fastened to the holder HA, which is supported on the opposite end side via a bearing 60 on the schematically indicated machine frame MG.

To the holder HA and thus also the suction channel 25 from the operating position (seal 24 is applied with a contact pressure on the surface 33 of the swing arm S2) in the dashed lines shown to shift out of operation, the pressure cylinder ZL is acted upon by the line 61 from a pressure source D1 , Once the seal 24 no longer rests on the surface 33 of the pivot arm S2 by the previously described displacement of the holder HA, the screen drum 15 via the pivot arms S1, S2 and the axis 15 in an in Fig.1 shown in dashed lines position to be pivoted (manually or via appropriate adjusting means). By the in Figure 5 shown displacement of the suction channel 25, the wear of the seal 24 can be minimized. Likewise, it is ensured via the pressure cylinder ZL that the seal 24 rests on the surface 33 with a sufficient pressure load in order to ensure the airtight connection in this region.

Coaxially to the sieve drum 15, a rotatably mounted control means 40 is disposed in the interior IR, which is also cup-shaped. The open end R2 of the control means 40 points in the direction of the suction channel 24. In the region of the opposite closed end R1, the control means is fixedly connected to the hollow shaft 18 (shown by a tongue and groove connection).

The control means 40 has on its periphery at least one window-shaped recess M1, via which the connection between the openings L of the screen drum 15 and the vacuum source D is controlled. Here is on the content of the pre-published WO 2006/012759 A1 See, in which the control for web formation has already been described via the control means. As indicated by dashed lines, further fixed shielding means 42 may additionally be provided within the control means 40 in order to shield in particular the removal region B from the negative pressure within the sieve drum.

On the outer end face of the closed end E1 of the screen drum 15, a gear Z1 is fastened to the screen drum via screws 46. The gear Z1 is drivingly connected to a gear Z2 in the operating position shown. there the gear Z2 is mounted on a shaft 43 which is driven by a gear G. The gear G is driven by a motor M.

Furthermore, a gear Z3 (adjacent to the gear Z1) fixedly mounted on the hollow shaft 18 and thus drivingly connected to the control means 40, which is also mounted on the hollow shaft 18. The gear Z3 is in drive connection with a gear Z4 in the position shown, wherein the gear Z4 is mounted on a shaft 44, which is also connected to the gear G. Instead of the transmission, it would also be possible to drive the shafts 43, 44 with individual electromotive drives.

The nonwoven fabric formed on the screen drum 15 is in the region of a take-off point B, for. taken from a schematically indicated take-off roll 48 of the screen drum and fed to a subsequent hopper unit with calender rolls 50 for band formation. The fiber sliver Fx formed there is then delivered to a conveyor table 51, on which it is fed with further slivers of a subsequent drafting unit.

Of course, other solutions are possible for the removal of the nonwoven fabric and banding. In the published EP-2452001 B1 For example, the nonwoven summary on appropriate guide means directly on the screen drum and the combined fiber material is then calendered via a coaxial on the screen drum mounted calender roll in cooperation with another calender and discharged via guide means to a conveyor table.

In the illustrated embodiment of the Fig.1 only the essential components of a web-forming apparatus are shown, which are necessary to illustrate the invention. On the presentation of other, necessary for the web formation elements such as shielding elements and guide elements in the area of the transfer point S has been omitted for reasons of clarity. Such elements are already known from the cited prior publications.

In the in Fig.1 and Figure 3 shown position, the web-forming device 13 is in the operating position in which it is held and fixed by a schematically attached to the machine frame MG locking unit 54. In this case, a spring-loaded latch engages around a bolt 38, which is attached to the respective pivot arm S1, or S2.

If it is necessary to clean the web-forming device 13, then the locking units 54 are released and pivoted about the pivot arms S1, S2, the screen drum 15 with the other components (control means, gears Z1, Z3, etc.) of the device 13 about the pivot axis in the arrow direction until the pivot arms come to an end stop 52 to the plant. The pivoting process is in Fig.1 indicated by dashed lines. In this pivoting operation, on the one hand, the drive connections between the gears Z1, Z2 and Z3, Z4 are released and, on the other hand, the open ends E2 and R2 of the sieve drum 15 and the control means 40 are accessible, since the suction channel 25 is not pivoted with the seal 24 and remains in its position. That is, the access to the interior IR of the suction drum 15 is now easily accessible to carry out the cleaning. In this position, it is also possible to replace individual elements by axial withdrawal from the shaft 16 after releasing one of the pivot arms S1, S2. Likewise, the transfer point S is freely accessible in this swung-out position, which also clean cleaning work can be carried out there.

After completion of the cleaning and any other work is the web-forming device 13 via the pivot arms about the pivot axis 32 back into the in Fig.1 pivoted operating position shown. By a corresponding embodiment of the bolt of the locking unit 54 of the bolt 38 passes automatically during the pivoting operation in the locking position shown. When reaching this position, the gears Z1, Z2 and Z3, Z4 again come into engagement and again form a drive connection (drive coupling). Likewise, in this pivoting operation, the seal 24 of the suction channel 25 again comes to rest on the outer surface 33 of the annular flange 35 of the pivot arm S2.

In order to align the position of the control means with respect to the angular position of the circular comb 5 exactly a mark 56 is mounted on the gear Z3, which is to bring according to the scale with a mark on the pivot arm S1 in accordance. The control, or the drive for the pivoting movement of the flap 22 may be in drive connection with the drive of the gears Z3, Z4. If this is the case, then the control flap 22 is also attached to the web-forming device 13 and pivoted during the pivoting operation.

Claims (13)

Apparatus for forming a fiber fleece (V) from fiber packets (F), which are supplied from a combing unit (9, 11) of a combing unit to a comber of the apparatus (13), with a sieve drum (15) rotatably mounted on an axle (16) in which, in an operating position of the device, a drive element (Z1) connected to the sieve drum is coupled to a first drive means (Z2) and to a suction passage arranged on one end of the sieve drum (15) on the machine frame (MG) of the comber (25), the one end with a vacuum source (D) and other ends in the operating position airtight with the interior (IR) of the screen drum is connected, characterized in that the axis (16) on which the screen drum (15) is mounted , at its ends to pivot arms (S1, S2) is attached, which at a parallel distance from the axis (16) has a pivot axis (32), via which it pivotally mounted on the machine frame (MG) b efestigt are and the device (13) via the pivot arms (S1, S2) into an inoperative position can be transferred, in which the drive connection between the drive element (Z1) of the screen drum (15) and the first drive means (Z2) is released and the airtight connection between the suction channel (25) and the interior (IR) of the screen drum is separated so that a free access to the interior (IR) of the screen drum is ensured. Apparatus according to claim 1, characterized in that a, within the screen drum (15) rotatably mounted on the axis (16) control means (40) is arranged, which has a drive element (Z3) which is arranged outside the screen drum and with a second drive means ( Z4) is coupled in the operating position and decoupled in an inoperative position. Device according to one of the preceding claims, characterized in that the pivot arms (S1, S2) are mounted on a common frame (30) having a common pivot axis (32) for the pivot arms. Device according to one of the preceding claims, characterized in that the control means (40) and the drive element (Z3) of the control means are mounted on a, in the sieve drum (15) projecting hollow shaft (18), and the hollow shaft (18) via bearing elements ( L1, L2) is rotatably mounted on the axle (16). Apparatus according to claim 4, characterized in that the screening drum (15) at least at one end (E1) via a bearing element (20) is rotatably mounted on the hollow shaft (18). Apparatus according to claim 5, characterized in that the screen drum (15) on the opposite end (E2) of the bearing element (20) in the radial direction on a guide element (28) is supported, which is mounted on the axle (16). Device according to one of the preceding claims 2 to 7, characterized in that for setting the position of the rotation angle of the control means (40) markings (56) on the control means (40) or connected to the control means elements (Z3) are provided, which at least one Marking (57) on a pivot arm (S1) facing. Device according to one of the preceding claims, characterized in that the drive element (Z1) connected to the sieve drum (15) and the first drive means (Z2) which can be coupled to the drive element are designed as toothed wheels. Device according to one of the preceding claims 2 to 8, characterized in that the drive element (Z3) connected to the control element (40) and the second drive means (Z4) which can be coupled to the drive element are designed as toothed wheels. Device according to one of the preceding claims, characterized in that in the region of the pivot arms (S1, S2) a locking device (54) is provided to fix the device in its operating position. Device according to one of the preceding claims, characterized in that the suction channel (25) in the region of its, against the open end (E2) screen drum (15) directed output opening (67) is provided with a peripheral seal (24), which is in the operating position on a surface (33) of a, provided with a passage opening (70) pivot arm (S2) is supported. Apparatus according to claim 13, characterized in that the suction channel (25) in the axial direction to the axis (16) in a guide (64, 65) via an adjusting means (ZL) is movably mounted. Combing machine with at least one device (13) according to one of the preceding claims.

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