WO2012167390A1 - Combing machine having a shielding element - Google Patents

Abstract

The invention relates to a combing machine, comprising a clamping assembly (1), which can be pivoted back and forth and which has a lower clamping plate (12) and an upper, movably supported clamping plate (14), a top comb (11), and a combing cylinder (4) rotatably supported inside a housing (50) below the clamping assembly (1), wherein the housing (50) is connected to a vacuum source (P) and has at least one opening (R2), which is connected to the space (R) between the clamping assembly (1) and a subsequent first roller pair (24), downstream of which a second roller pair (25) is arranged, and a rotatable cleaning element (34) is attached above the upper pressure rollers (24b, 25b) of the first and second roller pairs (24, 25). In order to eliminate disturbing effects on the soldering process by the air sucked out of the housing (50), it is proposed that a shielding element (30) is attached in the region between the clamping assembly (1) and the cleaning element (34), which shielding element extends over the length of the cleaning element, wherein the lower longitudinal edge (31) of the shielding element (30), which shielding element extends upward, is arranged at a distance (a) of between 0.1 mm and 7 mm from the circumferential surface (u1) of the pressure roller (24b) of the first roller pair (24).

Description

 Combing machine with a shielding element

The invention relates to a comber with a back and forth

 pivotable nipper unit with a lower tong plate and an upper, movably mounted tong plate and a fixed comb, and one, below the nipper unit rotatably mounted within a housing combing cylinder, wherein the housing communicates with a vacuum source and at least one opening which communicates with the space between the nipper unit and a subsequent, first pair of rollers is in communication, which is arranged downstream of a second pair of rollers and above the upper pressure rollers of the first and second roller pair, a rotatable cleaning element is mounted,

In the known combers with a back and forth swivel

The tongs ("tongs" for short) are grasped and combed out by a combing segment of a circular comb by means of a combing segment of a circular comb, with the tongs in a rearward position, and the tongs are then pivoted to a forward dead center position for the least distance On the way of the pliers from a rear position to a front position, the pliers are opened and then the end of the combed fiber tuft protruding from the tongs is overlapped and soldered to one end of a previously formed nonwoven fabric It is necessary that the end of the tuft comes exactly and in the correct position on the end of the fiber fleece to rest.

After the combing segment of the circular comb has ended the combing process, this passes through the rotary motion of the circular comb down in the

 Range of action of a rotating brush roller, over which the, set in the clothing of the combing segment and combed out components are removed. The circular comb, as well as the brush roller are mounted in a housing to which a vacuum source is connected. Thus, the combed components (short fibers, nits, dust, other impurities) are sucked through a connected below the housing channel and a

Disposal device supplied.

CONFIRMATION COPY The volume of air drawn off by means of the vacuum source is returned to the housing through openings in the housing, which are inter alia also in the area of the pliers and the tear-off rollers, from the surroundings of the comber. The suction of the air volume through the vacuum source is continuous, ie during the previously described soldering.

 It has been shown that with ever higher Kammspielzahlen the

Mastering an optimal soldering process is becoming increasingly difficult and requires further action. Also the suction for the combed out

Components were adjusted to the high combing numbers to keep the case clean. On the one hand ensures a high extraction of air volume the

Keeping clean the housing, or the circular comb, on the other hand, these high air circulation and air currents lead to adverse effects during the soldering process. D. h., Are in the area between the nipper unit and the

subsequent tearing rolls too large, directed downwards in the direction of the tuft air flows, so it can lead to an unclean coverage (soldering) with the end of the fiber web, which may have holes in the formed nonwoven fabric to some extent. This leads to quality losses in the subsequently formed combing machine belt. In addition, the air flow in the above-described soldering range can also be negative by, due to the high

Kammspielzahlen, ever faster rotating cleaning elements (brush roller, with plush Abstreifwalze, etc.) can be influenced.

It is therefore the object of the invention, the disadvantages of the known

Removes versions and to propose a device that ensures an optimal soldering process even at high Kammspielzahlen.

This object is achieved by proposing that in the area between the nipper unit (or the fixed to the nipper unit comb) and the cleaning element, a shielding is attached, which extends over the length of the cleaning element, wherein the lower longitudinal edge of the after above extending shielding element is arranged at a distance between 0.1 mm and 7 mm to the peripheral surface of the pressure roller of the first pair of rollers. With this device, the air flow generated by the vacuum source can be better controlled. By the partitioning of the cleaning element, which rotates above the respective pressure roller of the first and second roller pair, via the proposed shielding element, also air flows with respect to the opening between the first pair of rollers and the pliers can be retained, which are generated by the cleaning element. At the same time, a smaller passage opening is formed between the shielding element and the fixed comb. That is, the supplied air volume is reduced in this area. Thus, it can be achieved that the soldering process is not adversely affected by the air supplied from above reduced. If the air velocity, or the air volume in the soldering area (where the end of the tuft is placed on the end of the fibrous web to each other), so there is a risk that the end of the tuft is pressed down in the direction of the circular comb, causing it a faulty and dirty cover (soldering) of the two ends comes.

Preferably, it is further proposed that the distance between the

Peripheral surface of the pressure roller and the lower longitudinal edge of the shielding element is preferably between 1 mm and 5 mm. The smaller this distance is selected, the better the sealing off of the cleaning element with respect to the passage opening between the pliers and the subsequent first pair of rollers (also called tear-off rollers). On the other hand, this distance must not be too small so that it is not when setting fiber material on the pressure roller for

Winding comes and damage is thus excluded. It is further proposed to carry out the shielding as a plate. This can be easily installed in this area despite the tight

Installation conditions. In addition, no deposits of fiber material can form on the flat plate.

 Particularly advantageous is the attachment of the shielding to a, in

Machine frame pivotally mounted frame, which also carries the pressure rollers of the first and second roller pair. This makes it possible, the frame, with the pressure rollers and the shielding as a structural unit pre-assemble. Likewise, the shielding can be swung out of its operating position for cleaning purposes.

 Furthermore, it is proposed that the shielding element is provided with a cover extending in its longitudinal direction and protruding in the direction of the ridge of the nipper unit, the free end of the cover being spaced from the ridge when the nipper unit is in a forward dead center position. Thus, the air velocity in the attachment area can be further reduced. The additional cover acts as a chicane for the intake air volume.

This baffle effect can be further increased by further proposing that the fixed on the pliers Fixkamm with a, in its longitudinal direction

extending cover is provided, the free end in the direction of

Shielding element shows and - seen in the vertical direction - above or below the cover of the shield extends and the sum of the heights of the covers is greater than the distance between the shield and the fixed comb in the region of the covers when the nipper unit is in its forward dead center. That the cover of the shielding element and the cover of the fixed comb act together as a labyrinth, whereby the

Air velocity of the supplied volume of air in this area can be further reduced.

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

Show it:

 1 shows a schematic side view of a combing head of a known

 Combing machine in the region of the nipper unit with a shield attached according to the invention.

2 shows another embodiment of FIG. 1 in a partial view.

3 is an enlarged view of Fig.2

Figure 1 shows a known nipper unit 1 (called "tongs" for short), which is pivotally mounted on the crank arms 2, 3. In this case, two crank arms 2 are each mounted laterally of a circular comb 4 on the circular comb shaft 5 pivotally. Of the Round comb 4 has a comb segment 7 on a part of its circumference. The other end of the pivot arms 2 is rotatably on axes 10 on a

Clamp frame 8 attached. The rear pivot arm 3 (there may also be two) is rotatably mounted on a forceps shaft, not shown. The opposite free end of the pivot arm 3 is connected via a shaft. 9

rotatably connected to the clamp frame 8.

In general, several combing heads are arranged side by side on a combing machine, each combing head having a pair of pliers 1. In the examples, however, the attachment of a shielding element according to the invention is shown and described only on a single combing head.

The forceps 1 consists essentially of a fixed to the forceps frame 8 lower pliers plate 12 and an upper pliers plate 14 (sometimes called also pliers knife), 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 a strut 18th

connected, which in turn are mounted on an axis 20 on a driven eccentric 21. Seen in the material flow direction F of the fiber material W to be processed, a first pair of rollers 24 is provided behind the forceps 1. This

Roller pair 24 is also known in practice as "Abreisswalzenpaar or

Tear-off cylinder pair "and consists of a lower tear-off roller 24a, which cooperates with a tear-off pressure roller 24b to form a tear-off clamping line K. The first pair of rollers 24 is followed by a second pair of rollers 25, wherein the produced solder joint is still solidified.

 In order to free the pressure rollers 24b, 25b (which are provided with a rubber coating) of adhering components, above these rollers is a

Cleaning roller 34 (a brush roller in the example shown) freely rotatably mounted. In this case, the brush roller 34 lies with its own weight on the peripheral surfaces IM, U2 of the pressure rollers 24b, 25b and is driven by friction of pressure rollers. The brush roller 34 is mounted on its axis 35 in a slot 38 parallel to the axis 35 slidably and freely rotatably. The slots 38 (only one shown) are on both ends of the brush roller 35 mounted in a frame 40 which is pivotally mounted about the axis 41 in the machine frame MS of the combing machine.

 Likewise, the two pressure rollers 24b, 25b are freely rotatably mounted on the frame 40 via their axes A1, A2 and can be pivoted together with the shielding element 30 into an inoperative position via frames, as indicated by dashed lines in FIG. Before this pivoting operation, the brush roller is lifted out of the slots 38. The pressure rollers 24b, 25b are driven by friction from the lower rollers 24a, 25a connected to a drive (not shown). The drive generates, as is well known, a pilgrim movement.

Schematically indicated is a fixed comb 11, the means not shown on

Clamping frame 8 is fixed and in which the tuft FB of the fiber material W (eg., A cotton or fiber ribbons) is drawn in when its end E in the direction of the terminal point K of the subsequent first pair of rollers 24 on the movement of the end E1 of an already existing nonwoven fabric V is transported. This is indicated by dashed lines in FIG.

Within the pliers 1, a feed roller 27 is rotatably mounted, which is connected via a drive not shown in detail and performs a discontinuous rotational movement in order to transport the supplied cotton W in sections. Of the

 Feed cylinder 27 has a shaft 28, via which it is rotatably mounted on both ends via bearings not shown in detail in bearing receptacles of the nipper frame. The drive of the feed roller 27 can be done via a known jack drive, which is controlled by the movement of the upper tong plate 14. However, it is also possible to make the drive of the feed roller 27 regardless of the movement of the upper tong plate, where he z. B. can be done via a cam, as e.g. is shown in GB-PS 933,946. It would also be possible in this

Version used to install cam directly on the circular comb shaft, as shown for example in DE-PS 231 797. The drive of the feed roller 27 can be done in the forward or reverse of the pliers or pro rata in the forward and reverse. The feed roller 27 conveys the fibrous material W intermittently in the direction of the tong lip 30 of the lower tong plate second The combing takes place with Zangel closed, if this is in a rear position (not shown). In this case, the end of the fiber material projecting from the tongs (also called fiber tuft FB) reaches the area of the combing segment 7 of the circular comb 4 and is combed out. The clamping force for holding the fiber W during the combing process is generated by the schematically shown strut 18 which is pivotally mounted on the machine frame MS via the axis 20 and the eccentric 21.

After the combing out, the pliers 1 are pivoted into a foremost position (FIGS. 1 to 3) and simultaneously opened. In this case, the combed end of the fiber tuft FB is placed on the end of a previously partially transported back fiber web V and then transferred by the transport movement of the fiber web to the nip K of the first pair of rollers 24. During the described movement of the tuft FB comes in the area of the needles one

 Fixkammes 1, which is attached to the forceps frame 8. By the rotational movement of the first pair of rollers 24, the fibers of the fiber tuft FB, which arrive at the terminal point K are pulled out of the tuft and soldered to the end of the web V. In this case, the fiber tuft is pulled through the fixed comb 11, the nonwoven fabric is removed via the second subsequent roller pair 25 on a nonwoven table VT and then combined via known devices into a sliver and further transported.

Below the circular comb 4, a brush roller 44 is rotatably mounted in a housing 50, in which the circular comb 4 is located. The brush roller 44 is connected to a drive, not shown, and has bristles 45, with which it engages in ^■ the clothing of Kämmsegmentes 7 and removes the combed out components located therein. Under the action of a Saugluftströmung SA generated by a vacuum source P via the opening 51 in the lower region of the housing 50, the combed components and the removed by the brush roller 44 from the combing segment 7 parts of a disposal point not shown in detail. The, through the Saugluftströmung discharged air volume is through the Above the housing existing openings from the ambient air of the combing machine fed back to the housing 50. Such an opening is z. B. with R between the pliers 1, or, attached to the pliers Fixkamm 11 and the subsequent first pair of rollers 24 available. Another opening R1 is provided in the rear region of the pliers 1. Pointing upward to the pliers 1, an opening R2 is provided in the housing 50.

 This is only an example, since even more openings can be provided in the housing, via which air from the ambient air of the comber is tracked to compensate for the air volume.

 In order to keep the influence of the sucked through the opening R air volume to a certain size at which the attachment or the soldering operation is not disturbed, a shielding element in the form of a plate 30 is attached to the pivotable frame 40. The plate 30 may also be adjustably fastened. In this case, the lower longitudinal side 31 of the plate 30 extends at a small distance a (between 0.1 and 7 mm) to the peripheral surface U1 of the pressure roller 24b of the first pair of rollers 24. Thus, on the one hand the area of the brush roller 34 (can also be a plush-covered roller be) largely sealed off from the opening R and on the other hand the feed opening for tracking air in the housing 50 is reduced. This will influence the generated in the field of soldering

Air speed taken.

 In the embodiment of Figure 2 and Figure 3 (enlarged view of Figure 2), an additional shield 55 is attached to the plate 30, which extends in the longitudinal direction of the plate 30 and protrudes in the direction of the fixed comb 11. The term "longitudinal direction" in this case means "transverse to the conveying direction F of the fiber material". The term "fixed comb" includes the fixed comb holder and the combing set attached thereto.

In addition, a further shield 56 is attached to the fixed comb 11, which points in the direction of the plate 30. In this case, the longitudinal direction of the fixed comb 11 extends transversely to the conveying direction of the fiber material W. In the front dead center position shown in Figure 3, the shield 55 has a distance s to the top comb 11, while the shield 56 has a distance u from the plate 30. In the middle region, the shields 55, 56, overlap that a labyrinth forms, through which the sucked air is resisted, as shown by the arrows. Thus, in addition, the air velocity in the soldering area can be reduced, thereby preventing negative influences on the soldering process. The vertical coverage of the covers 55, 56 to form the labyrinth takes place during the

 Forward movement of the pliers 1 from a dashed line in Figure 3 position shown in the leading position shown by solid lines (dead center). Ie. as soon as the soldering process begins, the air flow is already between the

Covers 55, 56 deflected.

With the proposed attachment of a shielding is prevented in a simple manner that it comes despite higher Kammspielzahlen quality problems during the soldering process.

Claims

Claims. Combing machine with a reciprocally pivotable nipper unit (1) with a lower nipper plate (12) and an upper, movably mounted nipper plate (14) and a fixed comb (11), and one below the nipper unit (1) within a housing (50) rotatably mounted Kämmzylinder (4), wherein the housing (50) with a vacuum source (P) is in communication and at least one opening (R2) which communicates with the space (R) between the  Nipper unit (1) and a subsequent, first pair of rollers (24) in  Connection is, which a second pair of rollers (25) is arranged downstream and above the upper pressure rollers (24b, 25b) of the first and second roller pair (24, 25), a rotatable cleaning element (34) is mounted, characterized  characterized in that in the region between the nipper unit (1) and the cleaning element (34) a shielding element (30) is mounted, which extends over the length of the cleaning element, wherein the lower longitudinal edge (31) of the upwardly extending shielding element (30) at a distance (a) between 0.1 mm and 7 mm to the peripheral surface (u1) of the pressure roller (24b) of the first pair of rollers (24) is arranged. 2. combing machine according to claim 1, characterized in that the distance (a) between the peripheral surface (U1) of the pressure roller (24 b) and the lower  Longitudinal edge (31) is preferably between 1 mm and 5 mm. 3. Combing machine according to one of claims 1 to 2, characterized in that the shielding element consists of a plate (30). 4. comber according to one of claims 1 to 3, characterized in that the pressure rollers (24b, 25b) of the first and second roller pair (24, 25) and the shielding member (30) on a pivotable frame (40) in the machine frame (MS) stored, or are attached. Combing machine according to one of Claims 1 to 4, characterized in that the shielding element (30) is provided with a cover (55) extending in its longitudinal direction and projecting in the direction of the fixing comb (11) of the nipper unit (1), the free end the cover has a distance (s) to the fixed comb (11) when the nipper unit (1) is in a front dead center. The term "front dead center" means the position of the pliers, in which it has the smallest distance to the first pair of rollers and at this point the reversal of the pivotal movement of the pliers takes place in the direction of a rear dead center. Combing machine according to Claim 5, characterized in that the fixing comb (11) is provided with a cover (56) running in its longitudinal direction, the free end of which faces in the direction of the shielding element (30) and, viewed in the vertical direction, above or below the latter Cover (55) of Shielding element (30) extends and the sum of the heights (h1, h2) of the Covers (55, 56) is greater than the distance between the shielding element (30) and the fixed comb (11) in the region of the covers (55, 56) when the nipper unit (1) is in its forward dead center position. Shielding element (30) for use on a combing machine according to one of claims 1 to 6.