WO2010012112A1

WO2010012112A1 - Combing device for combing a fibrous material

Info

Publication number: WO2010012112A1
Application number: PCT/CH2009/000246
Authority: WO
Inventors: Ueli Stutz; Daniel Sommer
Original assignee: Maschinenfabrik Rieter Ag
Priority date: 2008-07-31
Filing date: 2009-07-09
Publication date: 2010-02-04
Also published as: EP2307597A1; EP2307597B1; CN102112670A; CH699285A2; CN102112670B

Abstract

The invention relates to a combing device for combing a fibrous material (F), which is supplied to a clamping assembly (1) that is supported in a machine frame (MS) and has a lower and upper clamping plate (2, 3), wherein the upper clamping plate (3) is movably supported with respect to the lower clamping plate (2) so as to form a clamping point (KS) and is pressurized by a loading unit (B1, B2) so as to produce a clamping force, and furthermore is provided with a feeding means (5) for supplying the fibrous material (F) to the clamping point (KS) of the clamping assembly, with which beneath thereof a combing cylinder (16) is associated that is rotatably supported in the machine frame (MS) and provided with at least one combing segment (19) on the periphery thereof, and wherein said plate is also provided with a tear-off means (8) associated with the clamping assembly. In order to enable an increase in the nipping speed, according to the invention the upper clamping plate (3) is provided with guide elements (12), which are guided on cam disks (14) for the direct control of the movement thereof, said disks being fastened non-rotatably to the rotation axis (7) of the combing cylinder (16) and the position of the lower clamping plate (2) remaining constant during a nip - as viewed in the direction of the tear-off means (8).

Description

Combing device for combing a fiber material

The invention relates to a combing device for combing a fiber material, which is fed to a stored in a Maschinengesteli nipper unit having a lower and upper nipper plate, wherein the upper nipper plate is movably mounted with respect to the lower nipper plate, to form a nip and for generating a clamping force is acted upon by a loading device and with a disposed within the nipper unit feeding means for feeding the fiber material to the nip of the nipper unit, which is assigned below a rotatably mounted in the machine frame Kämmzylinder which is provided on its circumference with at least one Kämmsegment and with a the tongs unit associated tear-off.

In today's combers is a reciprocating

The nipper unit consists of a reciprocating lower nipper plate, on which pivot arms an upper nipper plate is pivotally mounted

Pivoting movement of the upper pliers plate results from the oscillating movement of the lower pliers plate, with closed pliers, the clamping force is generated in the region of the pliers lips of upper and lower pliers plate by spring loaded arms, which are hinged on one side to pivot arms of the upper pliers plate and on the other hand on an eccentric shaft, which in Machine frame is stored. For the transfer of the upper tong plate in an inoperative position, the use of a special tool is necessary to pivot the tong plate against the permanently acting spring force. With today's combing machines, combing numbers of up to 500 KS / min are achieved on the basis of the optimizations that have been carried out in the meantime.

On the basis of moving at high accelerations parts of the nipper unit at these Kammspielzahlen but you have encountered mechanical limits that a further increase in Kammspielzahlen with the conventional elements is very difficult to perform, or even these may not allow. In the early years of the development of combing machines combing machines had been developed, which worked according to the Heilmann principle. The lower tong plate was substantially fixedly mounted in the machine frame, while the upper tong plate was pivotally hinged to open and close the pliers to the lower tong plate. In some versions of these machines, it was still envisaged that the nipper lip of the lower nipper lip could still make a slight vertical movement. Such an embodiment is z. Example, from GB-PS 474 456, wherein the control of the pivoting movement of the upper tong plate via an additionally mounted cam gear, which communicates with an output rod with the pivot levers of the upper pliers plate in connection. The demolition of the combed tuft takes place here with a tear-off, which together with a mounted on the circumference of the combing cylinder tear-off, which forms a nip with the withdrawal roller. The torn-off fiber packet is subsequently delivered to subsequent soldering rollers or soldering devices. Although only the upper tong plate was moved, only limited Kammspielzahlen were feasible with the illustrated embodiment of the cam gear. A similar embodiment is known from DE-PS 218606, wherein the movement of the upper tong plate is also controlled by a separately mounted cam gear. In this example, the tearing of the tuft is done by a separately arranged pair of tearing rollers. From a recent publication of DE-38 31 020 A1, the drive of a nipper unit is known, wherein the lower nipper plate performs a reciprocating motion, which is controlled by a roller which is guided on a cam (cam drive). The cam is mounted on the combing cylinder axis. The upper tong plate is taken over the reciprocating movement of the lower tong plate and is connected via a lever with another guide roller in connection, which is guided in an additional guide. Also in this embodiment, the movement of the upper tong plate is dependent on the movement of the driven lower tong plate and has additional guide elements to a corresponding movement to create during a comb play. This device is not suitable to increase the usual today Kammspielzahlen, or production quantities significantly. The invention is therefore based on the object, the nipper unit of a combing machine form with his drive so that it is possible that the previously achieved Kammspielzahlen and thus the production quantities can be significantly increased. Furthermore, the oscillations and also the noise development in the region of the nipper unit should also be kept constant or even reduced at higher comb rates with the proposed load device. This object is achieved by proposing that the upper

Pliers plate is provided with guide elements, which are guided for direct control of their movement on cams, which are rotatably mounted on the axis of rotation of the combing cylinder and the position of the lower pliers plate during a comb play - seen in the direction of Abreissmittels - constant. With this embodiment, the control of the movement of the upper tong plate is removed directly from the rotational movement of the combing cylinder, while the lower tong plate in the machine frame remains stationary with respect to the tear-off. With the proposed definition of the protection area, an embodiment is also included, wherein the lower tong plate may perform a slight vertical movement of its tong lip during the tearing operation to better transfer the tuft to a subsequent tearing device. Depending on the design of the tear-off device, the lower tong plate can remain completely immobile in position during comb play. Since essentially only the upper tong plate is driven, few moving parts are involved in the combing process, whereby an increase in Kämmspielzahlen is made possible without causing mechanical overloading of the drive elements. The proposed direct drive the movement of the upper tong plate of a non-rotatably seated on the combing cylinder axis curve, the rotational movement of the circular comb is accurately transferred to the movement of the upper tong plate. As a result, an exact synchronization between the combing cylinder and the nipper unit is given.

It is proposed to carry out the guide elements as rotatably mounted rollers. This gives a low-friction leadership. For damping at Start up and also to Lärmmindθrung these roles can be covered with a rubbery layer.

Preferably, it is further proposed that the upper tong plate is provided with lateral pivot arms via which it is pivotally mounted about an axis of rotation in the machine frame or on a tong frame of the lower tong plate, wherein the rollers are arranged on the pivot arms at a distance from the axis of rotation.

Furthermore, an embodiment is proposed, wherein the lower tong plate is mounted in the machine frame such that it occupies a substantially constant position during a comb play and the tear-off means is formed of a tear-off, which to form a nip in the direction of, on the circumference of the combing cylinder attached Abreisssegmentes is slidably mounted. This results in a compact design with little moving parts, the combing cylinder is directly involved in the tearing in cooperation with the tear-off.

In particular, for noise reduction and vibration damping at high Kammspielzahlen is proposed that the loading device consists of a compressed air source with compressed air acted upon bellows cylinder, which is supported in each case with one end directly or indirectly on the machine frame and with its other end connected to the upper pliers plate elements , Such a loading device could also be used in conjunction with other types of nipper units. By using bellows cylinders for the load of the upper tong plate, as already described, the noise level and the vibrations can be reduced, while at the same time only a small space requirement for these bellows cylinder is necessary. In addition, such bellows cylinder can compensate for certain angular deviations from their loading direction, making them ideal for this purpose, as will be described in more detail in subsequent embodiments. The use of bellows cylinders in this application allows stepless adjustment of the

Clamping force, as well as a central monitoring of the loading means. Likewise, no special tools are necessary to pivot the upper tong plate into an inoperative position. The term "bellows cylinder" is understood to mean a pneumatic lifting device that can be pressurized with compressed air and that is generally provided with a rotationally symmetrical bellows Elastomer is reinforced with a high-strength textile insert.

In order to obtain a uniform over the width of the nipper unit clamping force is proposed that in each case a bellows cylinder is supported on the pivot arms of the upper pliers plate. For lateral stabilization and fixation of the bellows cylinder is proposed that in the region of the support of the bellows cylinder on the upper tong plate each have a support surface is provided which has an opening into which a, the end face of the respective bellows cylinder protruding extension projects when this on the support surface rests. Advantageously, the extension of the respective bellows cylinder and the opening in the support surface may be dimensioned such that together they exert a clamping action on each other. This makes it possible that the upper clamp knife is lifted by the pivot arms for certain applications when moving the bellows cylinder by a certain amount. In order to obtain a free access to the nipper unit, or to allow the pivoting of the upper tong plate in a non-operating position, it is proposed that the bellows cylinder are secured to the machine frame pivotally mounted arms. That after swinging the bellows cylinder over the arms, the upper pliers plate can also be swung out. Of course, the claimed arms can also be directly connected to each other and form a total of a pivotable frame which is pivotable as an integral element.

In order to fix the arms with the bellows cylinders in a stable position in their working position, it is proposed that at least one locking device is provided on the machine frame in order to fix the frame in this position. For short-term relieving the upper pliers plate is proposed that the bellows cylinder is connected via a control valve with a compressed air source, which is reversible via a control unit for generating a Unterduckes.

Further advantages of the invention will be described in more detail with reference to the following embodiments and shown. Show it:

1 shows a schematic side view of an inventively designed combing device

1a is an enlarged partial view of Fig.1

Fig. 2 shows an embodiment of Figure 1 with open pliers

Fig. 3 is a plan view X of Figure 2

Fig. 4 shows a further embodiment according to Fig.1

1 shows the schematic view of a combing head of a combing machine. As a rule, a multiplicity (for example eight) of such combing heads are arranged next to one another and are connected to one another in terms of drive via continuous drive elements (longitudinal shafts). However, it is also possible to equip each of the combing heads with individual drives.

Above a combing cylinder (16) connected to a driven axle (7) there is provided a nipper unit 1 (called nipper 1 for short), which is provided with a lower nipper plate 2 and an upper nipper plate 3. The upper tong plate 3 is connected to lateral arms 4a, 4b (see also Fig.3), which are pivotally mounted about a pivot axis 6 on the lower tong plate. Since in the present example, the lower tong plate 2 assumes a stationary position (ie, is immovable during a comb play), the pivot axis 6 could also be mounted directly in the machine frame MS. On the arms 4 a, 4 b is in each case a bracket 10 is fixed (schematically two screw connections are indicated), which has at its free end an axis 11 on which a respective roller 12 is rotatably mounted. The rollers 12 may be provided for damping with an elastic layer (eg rubber) on its peripheral surface and are depending on the angular position of the combing cylinder 16 on a peripheral surface U of a cam 14 (Figure 2), which rotatably on the Axis 7 of the combing cylinder is attached. The cam plate 14 is provided with respect to the axis 7 with radically different radii R1, R2 on a portion of the circumference of the combing cylinder 16 a tear-off 20 is fixed, which for tearing off the combed fiber tuft FB (Figure 2) with a displaceable tear roller 8 a Clamping line KL forms.

Within the pliers 1, a feed roller 5 is rotatably mounted, which intermittently during a comb play fiber material F (tapes, nonwoven, wadding) from a source, not shown (wraps, cans, etc.) in the direction of the nip K of the forceps 1 supplies. The supply is carried out in dependence on the angular position of the axis 7 of the combing cylinder 16 by a gear, not shown. Following the tear-off roller 8, a fiber-fleece-forming device 22 is shown schematically, by means of which the fiber packets delivered by the tear-off roller 8 are brought together to form a fiber fleece or soldered. The fiber fleece-forming device 22 is hereby provided with a rotating screen drum 23, which is arranged downstream of a doffer roller pair. Such

Device may, for. B. the illustrated embodiment of published WO 2006/012759 A1 correspond.

As can be seen in Fig. 1, the pliers 1 is in the closed state, in which a tuft FB protrudes from the closed pliers 1 and is combed out of the combing segment 19 of the combing cylinder 16.

The clamping force of the clamp for clamping the fiber material is generated by bellows cylinder B1, B2, which at one end via an end face 30 on a transverse strut 28, which is connected to the pivot arms 4a, 4b of the upper tong plate 3, supported. This can also be seen in the enlarged partial view of FIG. 1a and the plan view X in FIG. The bellows cylinders are provided in the region of the end face 30 with an extension 31, which protrudes for lateral fixation of the respective bellows cylinder B1, B2 in an opening 33 of the transverse strut 28. The extension 31 and the opening 33 may be formed in the form or in the dimensions such that a releasable clamping connection (clamping force connection) between the extension 31 and the transverse strut 28 is formed. This makes it possible that when a negative pressure to the bellows cylinder B1, B2 and the resulting constriction of the bellows cylinder and the cross strut 28 and thus also the upper pliers plate 3 is lifted from the lower pliers plate 2. The Balgzyiinder B1, B2 are attached at their other ends via a receptacle 35 on a strut 36 via screws S. The strut 36 is fixedly connected to the pivot arms 37, 38 which are pivotally mounted about the pivot axis 40 in the machine frame MS. In the position shown in Fig.1 to Fig.3, the pivot arms 37, 38 are in a locked position in which they are fixed by a locking device 50. Of course, the locking in this position must be designed in such a way that it can not be released automatically during operation. The proposed solution is shown by way of example only. In this case, per Verrieglungsvorrichtung (one per swivel lever) provided on the machine frame MS bolt 51 is provided on which rests in the position shown a latch 54 under the action of a compressive force. The latch 54 has a sloping surface 52 on which the bolt 51 slides along when the pivot lever from a high tilted position (see dash-dotted line position in Figure 2) are transferred to the locking position shown. The bars are each connected to a spring 55, which are guided in a sleeve 57. The sleeve is in each case connected to a lug 58, which is attached to the pivot arm 37, and 38, respectively. In order not to excessively load the loading device and the guide elements for the upper tong plate during the transfer to the locking position, an end stop 60 is provided, by means of which the pivoting movement in the direction of the combing cylinder 16 is restricted. That is, when pivoting the pivot lever 37, 38 in the locking position shown, the pivot lever 37, 38 on the respective stop 60 at. However, once the Balgzyiinder B1, B2 are supplied with compressed air, the levers 37, 38 are lifted up to a distance a, wherein the further lifting is prevented by the locking device 50.

Via a respective port 42, the Balgzyiinder B1, B2 are connected to a line 44 which is attached to a valve 27. For uniform loading with compressed air, the individual lines of the respective Balgzyiinder B1, B2 are combined to form a common line which is connected to the valve 27. For reasons of clarity, however, only one line 44 is shown in the present example. The circuit of the valve 27 via an electromagnet 21, which is controlled via the line 46 by a control unit ST. A compressed air source 26 is connected via line 48 to the valve in connection. As indicated schematically, the drive of the shaft 7 of the combing cylinder 16 via a transmission G, which is controlled via the line 47 of the control unit ST.

In order in particular to control the fiber packages drawn off by the tear-off roller 8 in cooperation with the tear-off segment 20 (Heilmann principle) and to deliver them to the following fiber fleece-forming device 22 at a certain transfer speed, it is advantageous if the combing cylinder 16 is provided with a modulated speed from the transmission G is driven. Ie. The circumferential speed of the combing cylinder changes during a combing cycle and is adapted to the special working cycle (combing, tearing off). For example, the peripheral speed of the combing cylinder 16 during tearing off could be lower, in order to ensure a gentle discharge of the drawn fiber packets onto a subsequent screening drum. The application of modulated speeds in a combing cylinder (circular comb) of a conventional combing machine is already common prior art, such. In JP-57056525 (A).

In the position shown in Figure 1, the roller 12 is not on the circumference U of the cam 14 with the radius R2, so that the compression force generated by the under pressure Balgzylindern B1, B2 at the nip K of the pliers is fully effective , Upon further rotation of the shaft 7, or the cam plate 14, the area of the cam plate 14 with the larger radius R1 reaches the area of the roller 12, as shown in FIG. Characterized the roller 12 is raised with respect to the stationarily arranged lower tong plate 2 and thereby pivots the pivot arms 4a, 4b about the axis 6, whereby the forceps 1 opens.

In the meantime, the tear-off roller 8 has been displaced in the direction of the axis 7 and, together with the tear-off segment 20, forms a nip line for detecting the end of the already combed fiber tuft FB. The tear-off roller 8 is pressed against the tear-off segment 20 with a loading device, not shown, in this position. The departure process is now started, wherein the fiber packets torn off via the nip line are delivered to a screen drum, on which the formation of a fiber web takes place, which is removed via the pickup rollers for further processing. When tearing off is a schematically shown Fix comb FK engaged in tuft FB, through which the withdrawn fiber material is pulled through. For reasons of clarity, the illustration of the fixed comb FK in FIGS. 1 and 3 to 4 has been dispensed with. By pivoting the upper tong plate 3, the roller 12 is moved from the position shown in phantom to the position shown in solid lines. At the same time, the position of the support surface of the transverse strut 28 to the position of the support surface of the strut 36 with respect to the support of the bellows cylinder changed. In this case, the vertical of the support surface of the transverse strut 28 shifts to the vertical of the strut 36 by the angle α, as indicated in Figure 2. This angular displacement is, however, without problems by the use of

Balg cylinder compensated, without which it leads to functional problems. Due to the elasticity of the bellows cylinder, such a lateral displacement can be permitted without loss of function. Therefore, the use of such bellows cylinder for this application is particularly suitable and also has the already described further advantages in terms of noise reduction and vibration damping.

Upon further rotation of the axis 7 and thus of the cam 14, the roller passes again in the region of the smaller radius R2, where it again assumes the position already described in Figure 1. At the same time the tear-off roller 8 is lifted and the combing cycle begins again. As already described, for cleaning purposes or to eliminate malfunctions, the swivel arms 37, 38 can be transferred into an upwardly swung-out position after release of the locking device 50, as indicated in phantom in FIG. The extensions 31 of the bellows cylinder B1, B2 are pulled out of the openings 33 of the cross strut and the bellows cylinder B1, B2 pivoted with the pivot arms in the upper position of inoperative position. However, before carrying out the described swiveling, make sure that the bellows cylinders are no longer loaded with compressed air. In order to fix the pivot arms in this position, a locking device, not shown, may be provided. After swiveling out the pivot arms 37, 38, the upper pliers blade 3 can also easily be pivoted about the pivot axis 6 via the pivot arms 4a, 4b. The pivoting back into the working position takes place in the corresponding reverse order. In Fig. 4, a further embodiment is shown, wherein most of the elements also coincide with the elements which have been shown in the example of Fig. 1. Therefore, the same reference numerals are used for this example. The only difference to the embodiments previously shown is the different attachment of the upper tong plate 3. This is performed in this example in the vertical direction in side guides 70 which are fixed to the machine frame and which allow relative to the lower tong plate 2, a vertical displacement of the upper tong plate 3 , This embodiment is made possible by the lower tong plate 2 is not moved in its installed position during a comb play. The bracket 10, which carry the rollers 12 are, as indicated schematically, here in the vertical, in which moves the upper tong plate 3, or in the direction of the pressure load of the bellows cylinder B1, B2. This embodiment also includes the advantages which have been described in connection with the example according to FIG. 1. There are in the context of the invention still a variety of design variants possible.

Claims

claims

A combing device for combing a fibrous material (F) supplied to a nipper unit (1) mounted in a machine frame (MS), comprising a lower and upper nipper plate (2,3), the upper nipper plate

(3) with respect to the lower tong plate (2), for the formation of a clamping point (KS), is movably mounted and for generating a clamping force of a loading device (B1, B2) is acted upon and with a feed means (5) for feeding the fiber material (F) to the clamping point (KS) of the nipper unit (1), which below, a rotatably mounted in the machine frame (MS)

Combing cylinder (16) is associated, which is provided on its circumference with at least one Kämmsegment (19) and with a tongs aggregate associated tear-off (8), characterized in that the upper tong plate (3) is provided with guide elements (12) which for direct control of their movement on cams (14) are guided, which are rotatably mounted on the axis of rotation (7) of the combing cylinder (16) and the position of the lower tong plate (2) during a comb play - in the direction of the tear-off (8) seen - remains constant.

2. combing device according to claim 1, characterized in that the guide elements are rotatably mounted rollers (12).

3. combing device according to claim 2, characterized in that the upper pliers plate (3) with lateral pivot arms (4a, 4b) is provided by which they about an axis of rotation (6) pivotally mounted in the machine frame (MS) or on a

Pliers frame of the lower pliers plate (2) is mounted, wherein the rollers (12) on the pivot arms (4a, 4b) are arranged at a distance from the axis of rotation (6).

4. combing device according to one of claims 1 to 3, characterized in that the lower tong plate (2) is fixed in such a manner in the machine frame (MS) that it occupies a substantially constant position during a comb play and the tear-off means from a tear-off roller (8 ) is formed, which for forming a nip line (KL) in the direction of, on the circumference of the combing cylinder (16) attached Abreisssegmentes (20) is slidably mounted.

5. combing device according to one of claims 1 to 4, characterized in that the loading device from a compressed air source (26) can be acted upon with compressed air bellows cylinder (B1, B2), which has an end (35) directly or indirectly on the machine frame (MS) and other ends (30) on elements (4a, 4b, 28) connected to the upper tong plate (3).

6. combing device according to claim 5, characterized in that in each case a bellows cylinder (B1, B2) on the pivot arms (4a, 4b) of the upper tong plate (3) is supported.

7. combing device according to one of claims 5 to 6, characterized in that in the region of the support of the bellows cylinder (B1, B2) on the upper

Pliers plate (3) each having a support surface (28) is provided, which has an opening (33) into which, the end face (30) of the respective bellows cylinder (B1, B2) protruding extension (31) protrudes when this on the support surface (28).

8. combing device according to claim 7, characterized in that the

Extension (31) of the respective bellows cylinder (B1, B2) and the opening (33) in the support surface (28) are formed such that they together exert a clamping action on each other.

9. combing device according to claim 5, characterized in that the bellows cylinder (B1, B2) in the machine frame (MS) pivotally mounted arms (37, 38) are attached.

10. combing device according to claim 9, characterized in that the machine frame (MS) at least one locking device (50) is provided to the arms (37, 38) to fix in their working position.

11. combing device according to claim 10, characterized in that the arms (37, 38) are interconnected

12. combing device according to one of claims 5 to 11, characterized in that the bellows cylinder (B1, B2) via a control valve (25) with a compressed air source (26) are connected, which is reversible via a control unit (ST) for generating a Unterduckes ,