EP3172364A1

EP3172364A1 - Nipper assembly of a combing machine

Info

Publication number: EP3172364A1
Application number: EP15738480.1A
Authority: EP
Inventors: Daniel Bommer; Ueli Stutz
Original assignee: Maschinenfabrik Rieter AG
Current assignee: Maschinenfabrik Rieter AG
Priority date: 2014-07-21
Filing date: 2015-07-02
Publication date: 2017-05-31
Also published as: JP2017526824A; CH709901A2; CN106661777A; WO2016012886A1

Abstract

The invention relates to a nipper assembly (10) of a combing assembly (X1-X16) of a combing machine, comprising a lower nipper plate (2) and an upper nipper plate (3) which is mounted such that it can move relative to said lower nipper plate, the lower nipper plate (2) having a feed trough (19) on its upper side into which a rotatably-mounted feed cylinder (9) projects; and comprising a front guiding surface (VF) which connects to said feed trough (19) and which has a nipper lip (5) provided at its end. In order to increase the strength of said nipper assembly and to improve the guidance of fibre material inside the nipper assembly ahead of the feed cylinder, it is suggested that at least one rear guiding surface (HF) is mounted upstream of said feed trough (19) and comprises, in the region of each of its lateral edges, a rib (40, 41) that projects beyond the upper side of said lower nipper plate (2).

Description

Nipper unit of a combing machine

The invention relates to a nipper assembly of a combing unit of a combing machine with a lower nipper plate and a movable upper nipper plate to the lower nipper plate, wherein the lower nipper plate has on its upper side a feed trough into which a rotatably mounted feed cylinder protrudes, and with a the feed trough subsequent front guide surface at the end of a nipper lip is provided Such Zangenaggregate of individual Kämmaggregaten of combers are z. B. from EP-1449944 A1. In this case, the fiber material presented to the comber is fed to a nipper unit of a respective combing unit (also called combing head). The outstanding from the closed nipper unit end (fiber tuft) of the fiber material is combed out via a combing segment of a rotatably mounted below the nipper assembly round comb (combing cylinder). About a tear-off device (in the example shown by Abreisswalzen) a fiber package is withdrawn from the combed tuft and soldered with an already formed web. In the embodiment shown is a nipper unit, which is attached to pivot arms and performs a backlash movement during a comb play. Furthermore combing units are known, which operate according to the "Heilmann principle", whereby the lower pliers plate of the pliers aggregate is fixedly connected to the machine frame and is thus immovably supported Such an embodiment is shown for example in the published WO 2012/097461 A1. In this embodiment, the feed cylinder, the top comb, and the upper tong plate loading device are mounted on a swing-up frame to improve accessibility to the lower, fixed tong plate.

Due to the increasing number of combs, increased demands are placed on the strength of the nipper units used (short: pliers). In addition, it is necessary to guide the fiber material located in the pliers, even at high comb rates, so that there are no undesired fiber shifts within the fiber material. The invention is therefore based on the object to improve previously known designs of nipper units where on the one hand increased strength values of the nipper unit can be achieved even with the use of lighter materials and on the other hand, the fiber material is optimally guided within the nipper unit.

This object is achieved by proposing that the feed trough is preceded by at least one rear guide surface, which in the region of its side edges in each case has a web which projects beyond the upper side of the lower tong plate. In this case, the side edges of the rear guide surface extend in the longitudinal direction of the forceps, which coincides with the conveying direction of the fiber material. That the two proposed webs extend in the longitudinal direction of the forceps, or the lower tong plate and have z. B. at a constant distance from each other.

By the proposed attachment of the lateral webs, on the one hand, the bending stiffness of the lower tong plate can be increased and, on the other hand, the fiber material is guided laterally exactly before it enters the food well and is clamped there over the feed cylinder cooperating with the feed trough.

Furthermore, it is proposed that a feed surface is provided between the feed trough and the rear guide surface, which together with the adjacent rear guide surface forms an obtuse angle β and the webs extend at least partially over the length of the feed surface.

Thus, on the one hand, the lateral guidance of the fiber material is ensured until it is detected by the feed cylinder in the feed trough and, on the other hand, the flexural strength in the longitudinal direction of the lower tong plate is increased.

To that, z. B. merge supplied from two delivery points fiber material to a desired width for the subsequent processing process, it is further proposed that the, opposing guide surfaces of the webs in their immediately adjacent to the feed trough end regions each over a partial area - seen in the longitudinal direction of the webs - under at an angle, so that the clear distance between the guide surfaces in the direction of the feed trough steadily decreases. By thus, seen in the conveying direction of the fiber material, existing continuous narrowing of the lateral guidance of the webs, the fiber material is gently brought together to a predetermined width. In order to it is ensured that the subsequent feed cylinder, a fiber material is supplied with a constant width constant.

So that the fiber mass is also supplied with a constant constant width to the subsequent nip in the region of the front nipper lip of the lower nipper plate, it is further proposed that above the front guide surface two, spaced from each other having guides are mounted. These side guides for the fiber material may additionally be provided with guide sections arranged under a winding, by means of which the width of the fiber mass is again brought together to a predetermined width before it is clamped for the combing operation. In this combination, even protruding edge fibers can be incorporated.

In order to also improve the guidance of the fiber material between the lateral webs, in particular when feeding a plurality of fiber material strands (eg several slivers from different supply sources), it is further proposed that at least one guide web be provided between the lateral webs on the rear feed surface is, which extends in the longitudinal direction of the rear feed surface and divides the area between the lateral webs into at least two equal sections.

For the use of the nipper assembly for a process according to the "Heimann principle", with fixed lower pliers plate is proposed that the lower pliers plate on its underside, starting from its pliers lip, an arcuate, concave portion extending portion, which the front guide surface and the Opposite the food trough.

This makes it possible to mount a combing cylinder rotatably mounted below the pliers with the enveloping circle of its combing segment at a very small distance from the pliers lip of the lower stationary pliers plate, without causing collisions between the lower pliers plate and the combing segment of the combing cylinder.

For a simple and positionally accurate fastening of the lower tong plate to a carrier of the machine frame of the combing unit, it is proposed that the lower Tere pliers plate on its underside, which is opposite to the rear guide surface has a support surface.

Advantageously, the support surface is arranged in a recess of the lower tong plate. This makes it possible to install spacer elements in this depression in order to precisely set the distance between the nipper lip of the lower nipper plate and the enveloping circle of the combing segment of the combing cylinder. This can also compensate for existing tolerances or combing resp. the combing quality can be influenced.

Thus, even with a (in relation to a horizontal plane) inclined lower tong plate safe horizontal supply of the fiber material to the lower tong plate can be done, it is further proposed that the lower tong plate has a feed surface, to which - seen in the conveying direction of the fiber material - the rear Guide surface adjoins and forms an obtuse angle γ with this.

It is advantageous in relation to the guidance of the supplied fiber material on the lower tong plate when the at least one guide web and the webs extend into the region of the insertion surface.

For simple and inexpensive production is further proposed that the lower pliers plate consists of a one-piece casting, preferably of an aluminum die-cast. The upper pliers plate (also called pliers knives) cooperating with the lower pliers plate including the associated pliers

Swivel arms can also be made of a cast part (eg aluminum die-cast). In order to keep the wear of the lower and upper tong plate low, in particular in the area of the fiber guiding surfaces and the tong lip, it is proposed that the surface of the lower and upper tong plate is at least partially hard-metallized. That The surface of the lower and upper tong plate can be provided with a surface coating.

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

Show it:

1 shows a schematic side view of a known combing machine with several combing units

2 shows a schematic side view of an embodiment according to Fig.1 3 shows a schematic side view X of Figure 2

4 is an enlarged view of Figure 3 with the present invention formed nipper unit

5 is an enlarged view of Figure 4

6 is a plan view H of Figure 5 of the lower tong plate

Fig. 1 shows an already known embodiment of a comber 1, wherein a longitudinal part LT, which extends between a drive unit A and a tape tray BA, a side member 8, on which a plurality of juxtaposed Kämmaggregaten X1 to X16 are attached. These combing units generally have a smaller dimension than the combing heads of conventional combing machines, especially since they are loaded with only two fiber edges Z, which are drawn off from jugs F2 to Fx parked below the longitudinal member 8.

The combing units X1 to X16 with a width C are arranged directly adjacent to one another and screwed to the carrier 8, as can be seen from FIG.

102006026841 A1 can be seen. The combing units X1 to X16 each have a housing which is provided with corresponding bearing points to support the drive shafts, which are driven by the drive unit A.

The fiber slivers B formed on the individual combing units are deposited on a conveyor table FB (eg a driven conveyor belt) and fed in a transport direction D adjacent to a following drafting system S. The fiber material warped in the drafting system S is combined into a fiber sliver following the drafting system and then fed to a calender roll pair KW via schematically illustrated transport means. This transfers the sliver to a subsequent funnel TR, via which the sliver is placed in a pot K looped. In this embodiment, a free space FR below the housings of the combing units X1 to X16 with a distance FA to the floor O. This space allows good accessibility to the combing units. In a further exemplary embodiment (FIGS. 2 to 4), the attachment of a nipper unit designed according to the invention to a combing machine is shown. An embodiment of the nipper assembly according to the invention will be described in more detail in Figures 5 and 6 and shown.

In the embodiment of Figure 2, a longitudinal part LT of a combing machine 1 is shown, wherein the laterally adjoining this longitudinal part drive unit A is indicated only schematically. Likewise, a subsequent tape tray BA with a drafting unit S is indicated only schematically. These can be designed as in known designs (see FIG. 1). The longitudinal part LT in Figure 2 and Figure 3 consists of a longitudinal member 7, which is fixed to frame elements RE via schematically shown screws R at its two ends. He has a distance FA to the ground O on. The two frame elements RE are provided on their undersides each with two height-adjustable feet 20, via which they are supported on the floor O. With the adjustable feet, the longitudinal part can be compensated in relation to the ground condition.

Below the longitudinal member 7, a suction channel 17 is mounted, which (see Figure 2 and Figure 3) protrudes into openings 23 of the frame elements RE and there fastened (not shown) is. Suction nozzles (smaller suction channels) 17a, which lead to the respective combing unit X1-X8, in which the components combed out during the combing process (noils, dirt, nits, etc.) are sucked off from the suction nozzles 17a and open into the suction channel 17, open at a distance from each other Suction channel 17 are supplied. Via the suction channel 17, which communicates with a source of vacuum, not shown, the aspirated components e.g. fed to a central disposal facility.

The term "combing unit" is to be understood as meaning a device for combing out a pulp with subsequent banding of the combed pulp., Such a device generally consists of the following individual components such as a nipper unit, round comb (also called combing cylinder), fixed comb, pull-off cylinder or one, with the circular comb cooperating tear-off roller (Heilmann principle) with a subsequent soldering device (eg., a screen drum) and a nonwoven merging with banding. From Fig.2 it can be seen that on the side rail 7 at a distance G, a plurality of frame shields RS are fixed, which extend vertically upwards. As can be seen from the side view X of FIG. 2 in FIG. 3 and the enlarged partial view of FIG. 4, the side member 7 has a U-shaped longitudinal profile U with a bottom wall U1. In extension of the bottom wall U1 adjoins the longitudinal profile U, a side wall SW, which extends vertically upwards in the mounted position.

In the resulting space 22 between the one leg of the longitudinal profile U and the side wall W is a lower part of the respective frame plate RS to rest on the side member 7. That is, the frame RS is located with one side on the side wall SW and with its base GF on the longitudinal profile U on. As indicated schematically (FIG. 4), bores 21 are provided in the area of the installation from the respective frame plate RS to the longitudinal member 7, through which screws R protrude. The threaded portion (not shown) protrudes after mounting in threaded holes (indicated schematically) of the frame plate, whereby the frame plate RS is firmly connected to the side member 7.

In addition, and at a distance from the longitudinal member 7, a transverse web QS is provided in each case between two adjacent frame plates RS, which has a length which corresponds to the distance G. As indicated schematically in Figures 4 and 5, the transverse webs at their respective ends, with which they rest against the respective frame plate RS, have laterally projecting tabs, over which they are fastened by means of fastening means (eg screws) P on the Side shield SE are attached. The side plate may be provided with corresponding stops or depressions, via which the respective transverse web QS is positioned on the frame shield RS.

The individual side plates SE are provided with a plurality of bearing receptacles 14 for receiving and supporting longitudinal shafts (eg the circular comb shaft 15 or the shaft of the brush roller 13). These longitudinal shafts are driven by drive elements, which are located in the drive unit A. As can be seen in particular from FIG. 5 (enlarged partial view of FIG. 4), in each case a lower tong plate 2 of a nipper unit 10 (referred to as "tongs" for short) is fastened to the transverse webs Q. The lower nipper plate 2 has on its underside te a bearing surface AF, with which it rests on an upper surface OF of the cross web QS. The respective transverse web QS is arranged at an angle α with respect to a horizontal plane E. To set the distance a between a front tong lip 5 and the enveloping circle HK of a combing segment 29 of a pliers 10 rotatably mounted combing cylinder 1 1, one or more spacer plates 25 between the surface OF of the transverse web QS and the support surface AF of the lower tong plate. 2 be provided. This can be done during assembly using setting gauges. The lower tong plate is positioned by means of two cylindrical pins (not shown) exactly in their longitudinal direction (corresponding to the conveying direction F) on the transverse web QS. The recess V in the support surface AF supports the positioning of the tong plate during assembly. For fastening the lower pliers plate 2 on the transverse web QS screws M are also provided which, as shown schematically, project through through holes DB of the transverse web QS and protrude into threaded holes GB of the lower pliers plate 2. If spacer plates 25 are used, they must also be provided with corresponding through holes for the screws M.

Thus, the distance a between the enveloping circle HK of the combing segment 29 of the combing cylinder 1 1 and the nipper lip 5 of the lower nipper plate 2 can be kept as small as possible, the lower nipper plate on its underside following the nipper lip 5 an arcuate, concave extending portion 35 on , in which the combing cylinder 1 1 projects with its enveloping circle HK.

On the upper side of the lower tong plate 2, which is opposite to the arcuate section 35, it has, starting from its front tong lip 5, an obliquely rising front guide surface VF, to which a feed trough 19 (opposite to the conveying direction F) adjoins. The front guide surface VF extends in the installed position of the lower tong plate 2 and counter to the conveying direction F with respect to a horizontal plane E at an angle δ between 60 ° and 80 °.

In order to keep the fiber material Z supplied from the feed trough 19 of the front tong lip 5 at a desired width, lateral guides 44, 45 are provided above the front guide surface VF at a distance d (FIG. 6). These guides 44, 45 can, viewed in the conveying direction F, be connected at an angle n. be provided guide surfaces, which narrow the fiber material in the implementation between the guides again in their width before it reaches the nip at the nipper lip 5. This ensures that the fiber material Z is present with a constant width constant for the subsequent Auskämmprozess.

In the feed trough 19 protrudes within the pliers 10 rotatably mounted feed cylinder 9, which is driven in steps by a drive not shown in detail. The fiber material Z (for example in the form of fiber slivers) fed to the forceps 10 via a pair of rollers 28 arranged upstream of the forceps is guided in a first section on an upper feed surface ZF of the lower forceps plate 2. This feed surface extends approximately horizontally and forms an obtuse angle γ with a (in the conveying direction F) located on the upper side of the lower tong plate 2 rear guide surface HF, on which the fiber material Z is further guided in the direction of the subsequent feed trough 19. Viewed in the conveying direction F, the rear guide surface HF is arranged sloping in the installation position shown by an angle α between 40 ° and 60 ° with respect to a horizontal plane E.

Between the feed trough 19 and the rear guide surface HF, the lower tong plate 2 has an insertion surface EF which forms an obtuse angle β with the rear feed surface HF.

The proposed oblique arrangement of the lower tong plate 2, in particular the rear guide surface HF, the material flow within the forceps 10 can be visually monitored by an operator visually. Also, the accessibility to the lower tong plate 2 is improved in order to perform appropriate service. At the same time, the proposed inclined position of the lower tong plate 2 also simplifies access to the combing cylinder 1 1 mounted below the forceps 10 and the brush roller 13 from the rear side of the comber.

FIG. 6 shows a plan view H (according to FIG. 5) on the lower tong plate 2. In the respective edge regions of the lower tong plate 2 webs 40, 41 are provided, which extend over the feed surface ZF, the rear guide surface HF and partly over the insertion surface EF. These webs 40, 41 serve on the one hand for lateral guidance of the fiber material moving on the upper side of the lower tong plate. Z, which is present in the example shown in the form of two slivers Z and on the other hand to increase the strength of the lower tong plate 2. This can, for. B. be made of an aluminum die-cast.

To that, z. B. merge supplied from two delivery points fiber material Z to a desired width for the subsequent processing process, the guide surfaces 42, 43 of the webs 40, 41 in their immediately adjacent to the feed trough 19 end regions each with an inwardly inclined by an angle I surface Mistake. This results - seen in the conveying direction F of the fiber material - a narrowing of the lateral guide by the webs 40, 41st That is, the clear distance between the guide surfaces 42, 43 is steadily reduced in the conveying direction F. As a result of this continuous constriction of the lateral guide surfaces 42, 43 of the webs 40, 41, the fiber material is gently gathered to a predetermined width. This ensures that the subsequent feed cylinder, a fiber material is supplied with a constant width constant.

So that collisions (displacements and loosening of fibers in the edge areas) between the two fiber slivers Z supplied at least in the area of application of the fiber material Z to the lower tong plate 2 (ie above the feed surface IF), a guide web 38 is centrally located above the feed surface ZF attached, which partially protrudes into the subsequent rear guide surface HF and divides this area into two equal sections (T1, T2). As a result, the merging of the two fiber slivers Z supplied in a width c into a closed fiber material flow takes place only in a region of the insertion surface EF, shortly before the fiber material is detected by the feed cylinder.

Threaded holes GB are still schematically shown in FIG. 6, via which the tong plate 2 is fastened by means of screws M on the transverse web QS.

Mounted above the lower tong plate 2 is a pivotable frame 4 (or pivot arms) which carries an upper tong plate 3 which, together with the lower tong plate 2, can form a nip in the area of the front tong lip 5, as shown in the present view of FIG .5 can be seen. The frame 4 is by means not shown pivotally mounted about an attached to the frame signs RS axis 6 (see double arrow).

In the example shown, the fiber beard FS protruding beyond the clamping point is combed out by a combing segment 29 of a combing cylinder 11. The tuft FS represents the free end of a fiber material, which in the form of one or more slivers Z, which are withdrawn from cans KV, the clamping point of the forceps are fed under the action of the feed cylinder 9. On the opposite side of the combing segment 29, a tear-off segment 30 is mounted, which cooperates in the tearing off of the combed end of the tuft FS with an undeliverable tear-off roller 12. The withdrawn fiber packets are then brought together (soldered) on a subsequent screening drum 16 and formed into a sliver B on a unit 26 (with fleece straightener and calender rolls).

A detailed description of such a device may e.g. B. also be taken from EP-2 350 361 A1.

The fiber sliver B formed in this way is deposited on a conveyor table FB (FIG. 4), on which it is transferred to a subsequent drafting unit S with further, adjacent sliver bands of adjacent combing units. The conveyor table FB may consist of a driven conveyor belt.

As already described, the fiber sliver formed on the drafting unit S is fed to a depositing device (belt deposit BA), by means of which it is deposited in cans K in the shape of a loop.

To keep clean the combing cylinder 1 1, a brush roller 13 is disposed below the combing cylinder, which is mounted in storage units, which are integrated in the frame signs RS.

To increase the strength of the longitudinal member 7 and thus the entire longitudinal part LT transverse struts 18 are mounted within the U-shaped longitudinal profile. Seen in the longitudinal direction of the longitudinal member 7, the adjacent transverse struts 18 each extend at an opposite angle b to a horizontal plane, whereby a honeycomb-shaped structure of the stiffeners, seen over the length of the U-profile results. The individual stiffeners extend - seen transversely to the longitudinal direction of the longitudinal member - about the height of the free legs of the U-profile U.

Claims

claims

1 . Nipper unit (10) of a combing unit (X1 - X16) of a comber having a lower tong plate (2) and an upper tong plate (3) movably mounted to the lower tong plate, the lower tong plate (2) having on its upper side a feed trough (19 ), in which a rotatably mounted feed cylinder (9) protrudes, and with a, to the feed trough (19) adjoining front guide surface (VF) at the end of a tong lip (5) is provided, characterized in that the feed trough (19) has at least one rear guide surface (HF) in front, which in the region of its side edges each one, the top of the lower tong plate (2) superior web (40, 41).

2. nipper unit (10) according to claim 1, characterized in that between the feed trough and the rear guide surface (HF) a feed surface (ZF) is provided, which together with the adjacent rear guide surface

(HF) forms an obtuse angle (β) and the webs (40, 41) extend at least partially over the length of the feed surface (ZF).

3. nipper unit (10) according to one of claims 1 to 2, characterized in that, the mutually opposite guide surfaces (42, 43) of the webs

(40, 41) in their directly adjacent to the feed trough (19) adjacent end regions in each case over a partial area - seen in the longitudinal direction of the webs - at an angle (I), such that the clear distance between the guide surfaces (42, 43) steadily reduced in the direction (F) to the feed trough (19).

4. nipper unit (10) according to any one of the preceding claims, characterized in that above the front guide surface (VF) two, a distance (d) to each other having guides (44, 45) are mounted.

5. nipper unit (10) according to any one of the preceding claims, characterized in that between the lateral webs (40, 41) on the rear feed surface (HF) at least one guide web (38) is provided, which in Extends longitudinally of the rear feed surface (RF) and divides the area between the lateral webs (40, 41) into at least two identical subsections (T1, T2).

6. pliers unit (10) according to any one of the preceding claims, characterized in that the lower pliers plate (2) on its underside, starting from its pliers lip (5), an arcuate, concave portion extending portion (35), which the front guide surface ( VF) and the feed trough (19) is opposite.

7. nipper unit (10) according to any one of the preceding claims, characterized in that the lower nipper plate (2) on its underside, which the rear guide surface (HF) opposite a support surface (AF).

8. nipper unit (10) according to claim 7, characterized in that the bearing surface (AF) in a recess (V) of the lower tong plate is arranged.

9. nipper unit (10) according to any one of the preceding claims, characterized in that the lower nipper plate (2) has a feed surface (ZF) to which the rear guide surface (HF) adjoins and forms an obtuse angle (γ) with this.

10. nipper unit (10) according to claim 9, characterized in that the at least one guide web (38) and the webs (40, 41) in the region of the insertion surface (EF) extend.

1 1. Nipper unit (10) according to one of the preceding claims, characterized in that the lower tong plate (2) consists of a one-piece casting.

12. nipper unit (10) according to claim 1 1, characterized in that the casting consists of aluminum die cast.

13. nipper unit (10) according to any one of claims 1 1 to 12, characterized in that the surface of the lower and upper tong plate is at least partially hartemataliert.

14. Combing machine with a nipper unit according to one of claims 1 to 13.