EP1644560B1 - Clamping unit for a combing machine - Google Patents

Description

The invention relates to a gripper unit of a combing machine with a reciprocating pliers frame having a pliers plate, which can form a nip with a pliers frame movably mounted upper nipper plate in the region of the nipper plate lip and with a mounted in the nipper frame feed roller, for transport the fiber material cooperates with a feed trough above the tong plate, wherein the nipper unit is arranged downstream of a Abreisszylinderpaar stored in the machine frame and at least one clamping point for the fiber material between the feed trough and feed roller is provided.

Such an embodiment can be found, for example, from the reference "Die Kurzstapelspinnerei, Volume 3: Kämmerei, Strecken, Flyer - The Textile Institute / W. Klein" on pages 22 to 24.
Likewise, in EP-0 816 540 an embodiment is shown, wherein above a pliers plate a feed trough is mounted, which cooperates with a feed roller. In order to vary the nip line between the feed roller and the feed trough in this case the feed trough is adjustably mounted with respect to the position of the feed roller. In addition, the device shown has an additional deflecting element following a first deflection at the feed trough in order to increase the adhesive force of the fibers within the fiber amount and thus to better control floating fibers.
This first deflection in the example of EP-0 816 540 in the region of the outlet region of the feed trough defines the last nip between the feed trough and the feed roll before the fiber material or the cotton web leaves the nip between the feed roll and the feed trough.
For the tearing off of the tuft, the distance between this deflection point or the last nip and the nip line between the following tear-off cylinders forms the "tear-off distance". This tear-off distance should only be insignificantly greater than the longest fiber of the stack of the fiber material to be processed for an optimal stretching operation during the tear-off process.

In order to achieve an optimum result (economic and quality) in the combing process, the operator of the machine is required, depending on the material template, to adjust the settings of the machine accordingly. The optimal setting of the tear-off distance is also included.
With the adjustment of the feed trough shown in EP-816 540, the first deflection, or the last nip, can be varied with respect to the distance to the nip line of the following tear-off cylinders. However, the adjustment is severely limited by the fixed position of the feed roller. In addition, change in this type of adjustment, the geometric relationships of the feed trough to the feed roller, which also change the clamping conditions to the wadding path. Likewise, in this arrangement, no clearly defined clamping points between the feed trough and feed roll available.

The invention is therefore based on the object to propose a device by which a simple adjustment of the tear-off distance can be made without the position of the feed trough changes to the feed roller.

This object is achieved by proposing that the feed trough assumes a fixed position with respect to the tongs frame and at least one means changeable in its position and defining the nip is provided between the feed roll and the feed trough.
This makes it possible to easily adapt the tear-off distance without changing the geometric transport conditions for the wadding web. In addition, hereby a clearly defined nip between the feed trough and the feed roller can be adjusted. If it is necessary to adjust the Ecartement on the basis of the fiber material to be processed, or the desired Ausungskämmung, this can be compensated with the adjustment of the additional agent in the feed trough to get back to optimal conditions (tear-off distance) during tearing.

Preferably, it is proposed that the means is designed as a guide element which extends within the feed trough over the width of the feed trough and defines with the feed roller at least one nip for the fiber material.
It is provided that - seen in the transport direction of the fiber material - the front end of the guide element forms the foremost clamping point for the fiber material. This can be achieved by the arcuate surface of the guide element, which faces the feed roller, has a smaller radius than the radius of the feed roller.

For fixing the guide elements within the feed trough, it is proposed that the tong plate in the region of the feed trough be provided with receptacles which are designed to receive means attached to the respective guide element in order to fix the guide means in their installed position.

In this case - viewed over the width (B) of the feed trough - at least one row or a plurality of rows of receptacles may be provided. This ensures easy installation, since the guide elements must be inserted only in the appropriate recordings.

However, it is also possible, as further proposed, to fasten the guide elements so that they can be adjusted continuously in their position. In this case, it would be advantageous to provide markings in the individual adjusting devices, so that the adjustment can be made exactly the same for all combing heads.

In order to carry out a further adaptation within the gap between the feed trough and the feed roll, it is proposed that at least one further adjustable guide means is provided in the feed trough, which forms an additional nip with the feed roll. Thus, a second clamping point can be defined in the region of the feed roller.

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

Show it:

Fig.1

a schematic side view of a known nipper unit

Fig.2

an enlarged partial view of Figure 1 with claimed according to the invention guide elements

Figure 3

a sectional view A-A of Figure 2

Fig. 4

a further embodiment of Figure 2 with multiple guide elements

Figure 5

A stepless adjustment of the guide elements according to Fig.2

Figure 1 shows a nipper unit 1, which is pivotally mounted on the crank arms 2, 3. In this case, two crank arms 2 each side of a schematically indicated circular comb 4 are pivotally mounted on the circular comb shaft 5. The other end of the pivot arms 2 is rotatably mounted on the clamp frame 8. The rear pivot arm 3 (there may also be two) is rotatably mounted on a gun shaft 10. The opposite free end of the pivot arm 3 is rotatably connected via a shaft 9 with the clamp frame 8.

The nipper unit 1 consists essentially of a fixed to the forceps frame 8 lower pliers plate 12 and an upper pliers plate 14 (partially also called pliers blade), which is attached to two pivot arms 15, 15 '. These pivoting arms are pivotally mounted on the tong frame 8 via a pivot axis 16. The pivot arms 15, 15 'are each connected to a spring leg 18, which in turn are mounted on a driven eccentric 21 via an axis 20. Seen in the material flow direction T behind the nipper unit a Abreisszylinderpaar 24 is provided. On the presentation of a Fixkammes, which is associated with the forceps frame 8, was omitted for the sake of clarity.
The nipper unit 1 is located in the view of Figure 1 in a front position in which it is open and the tearing operation is performed with the end of the wadding web W. This end is commonly referred to as tuft FB. In this foremost position (also called front dead center position) there is a distance X Following the nip P at the end of the feed trough, a first deflection for the Wattebahn transported between the feed roller 27 and the feed trough 26, from which they in the direction of the nip line takes place between the nip PA of tear-off cylinders 24 and the last nip P of the feed trough PA the tear-off cylinder 24 transports, bez. is deducted.
The distance X is equal to the tear-off distance during the tear-off process. For carrying out the feed by means of the feed roller 27, a pressure force between the feed roller 27 and the feed trough 26 is exerted on the wadding web at least in partial regions of the feed nip. The amount of compressive force on the pulp is defined by the distance between the feed trough and the feed roll. That is, at the point where this distance is the lowest, the compressive force acting on the fiber mass is greatest. This point forms the actual clamping point, which defines the tear-off distance X.

FIG. 2 shows an enlarged partial view of FIG. 1 with the guide means claimed according to the invention, which is subsequently designated by the term "insert E". This insert E extends, as shown in the sectional view AA in Figure 3, across the width B of the feed trough 26 and is applied to the curvature. Insert E moves the clamping point P to P1, which also changes the break distance to X1. The curvature of the insert E, which faces the feed roller has a smaller radius R1 than the radius R of the feed roller 27. By appropriate mounting within the feed trough ensures that a precisely defined nip for the cotton web between the insert E and the feed roller at the front end of the insert E is formed.
An increase in tear-off distance X1 may be necessary, for example, when a material for combing out has to be combed with a larger stack (characteristic for fiber length). That is, by using a sliding insert E, the tear-off distance X can be adapted to different pile lengths without having to change the ecartement e. On the other hand, it is of course possible, if the Ecartement must be adjusted (eg to change the Kämmlingsanteils), that with the adjustment of the use again optimal Conditions during tearing can be adjusted. For example, with an increase in the Ecartements e of the insert E can be adjusted in the direction of the tear-off to hold the tear-off distance X kontant.

The insert E is provided with a plurality of spaced apart over the width B pins S, which protrude into receptacles 29 and thus secure the insert E in the transport direction T against displacement. If necessary, additional fuses could be provided, which secure the pins S in the direction of its longitudinal axis to prevent lifting from the feed trough. On the presentation of lateral guides for the cotton in the area of the feed trough 26 was omitted for reasons of clarity.

As can be seen from the representation of FIG. 2, several rows of receptacles 29 are arranged one behind the other, as seen in the transporting direction T. This allows the insert E to be secured by simply "repositioning" in e.g. a position is moved, which is drawn in dashed lines in the example with E1. This increases the tear-off distance to X2. Depending on the number of shots 29 several settings are possible.

In Fig. 4, a further embodiment is shown, wherein a second insert E2 is inserted in the feed trough 26, which is inserted in the region of the introduction of the cotton wool W between the feed roller 27 and the feed trough 26. Also this insert E2 is, as shown by a double arrow in its position in the transport direction T movable. Due to the position of the insert E2, an additional clamping point KP between the feed cylinder 27 and the insert E2 can be defined. This further clamping point KP has an influence on the retention force on the fibers during the tearing process and on the transport of the cotton wool during the feeding process. The insert E defines the foremost clamping point P1. Both inserts E, E2 have pins S, which protrude into receptacles 29 of the feed trough 26 and thus ensure the fixation in their position. The inserts E and E2 also have, as described in Figure 2, a smaller radius of curvature R1, as the radius R of the feed roller 27. Thus, an exact nip is defined.

5 shows a further embodiment, wherein the insert E is fixedly connected on both sides, each with an arm 31 which are connected on their opposite sides with a disc 33. These discs 33 are pivotally mounted on a schematically shown axis 32. The axis 32 coincides with the center of the radius r of the feed trough 26. The discs 33 are each provided with two elongated holes 34, through which screws 35 protrude. The screws are received in not shown threaded holes of a schematically indicated bearing plate 38, which is connected to the frame 8 and at the same time can be provided for the storage of the feed roller. By loosening the screws 35 on both sides of the receptacle E (only one side shown), this can be adjusted as indicated by a double arrow within the feed trough 26 about the axis 32 continuously. Once the desired position is reached, the screws 35 are tightened, whereby the disc 33 is clamped against the bearing plate 38 and thus the set position is fixed by the clamp. It is also conceivable to provide on the disc 33 markings, which result in interaction with markings on the bearing plate 38 a precise adjustment. This design allows a variety of settings of the terminal point P1, but is somewhat more expensive.
It is also possible to provide an insert E, which extends approximately over the entire length of the feed trough 26 and also ensures the adjustment of the nip P1.
It would also be conceivable to provide inserts for replacement, which have different contours on the surface opposite the feed cylinder 27.

Claims (9)

1. A nipper unit (1) of a comber comprising a nipper frame (8) which can be moved to and fro, which has a cushion plate (12) which can form a nip with an upper cushion plate (14) movably mounted in the nipper frame (8) in the area of the cushion plate lip (13) and comprising a feed roller (27) mounted in the nipper frame (8) which cooperates with a feeding trough (26) above the cushion plate (12) for transport of the fibre material (W) wherein a pair of detaching rollers (24) mounted in the machine frame is positioned after the nipper unit (1) and at least one nip (P) for the fibre material (W) is provided between the feeding trough (26) and the feed roller (27), characterised in that the feeding trough (26) occupies a fixed position in relation to the nipper frame (8) and at least one means (E) defining the nip (P1), whose position can be varied, is provided between the feed roller (27) and the feeding trough (26).
2. The nipper unit (1) according to claim 1, characterised in that the means are embodied as a guide element (E) which extends inside the feeding trough (26) over the width (B) of the feeding trough and with the feed roller (27) defines at least one nip (P1) for the fibre material (W).
3. The nipper unit (1) according to claim 2, characterised in that, seen in the direction of transport (T) of the fibre material (W), the front end of the guide element (E) forms the nip (P1) for the fibre material (W).
4. The nipper unit (1) according to any one of claims 2 to 3, characterised in that the cushion plate (12) is provided with receptacles (29) in the area of the feeding trough (26) which are embodied to receive means (S) attached to the respective guide element (E) to fix the guide element (E) in its built-in position.
5. The nipper unit (1) according to claim 4, characterised in that, seen over the width (B) of the feeding trough (26), at least one row of receptacles (29) is provided.
6. The nipper unit (1) according to claim 5, characterised in that, seen in the direction of transport (T) of the fibre material (W), a plurality of rows of receptacles (29) are provided one after the other.
7. The nipper unit (1) according to claim 2, characterised in that means (31, 33, 35) are provided which, seen in the direction of transport (T) of the fibre material (W), allow continuous adjustment of the guide element (E) and subsequent fixing.
8. The nipper unit (1) according to any one of claims 1 to 7, characterised in that at least one further adjustable guide element (E2) is provided in the feeding trough (26) which with the feed roller (27) forms at least one further nip (KP).
9. The nipper unit (1) according to any one of claims 2 to 8, characterised in that the guide element (E, E2) seen in the direction of transport (T) is constructed as arc-shaped and the concave face lying opposite to the feed roller has a smaller radius of curvature (R1) than the radius (R) of the feed roller (27).

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