CN1657668A - Traction rollers for combing machines - Google Patents

Abstract

The invention relates to a textile machine having at least one comb (1) between two bearing panels (30) and the obtained fibre net material (V) is conveyed to a discharge slit (12) by a conveyer (8) on a guiding device (9) wherein the discharge slit (12) is laterally bias mounted against the center (M) of the conveyer (8), thus the discharge slit (12) is off the conveyer (8) and the unfolded fibre net material (V) bundles towards the discharge slit and is conveyed to a pair of calander drums (14). The calander drum (14) comprises a driven and fixed roller (14a) and a pressure roller (14b) for enclosing the rotation axis (22), wherein the pressure roller is extruded along the radial direction of the roller (14a) by at least one spring unit (24) at the operation position of pivoting and entering.

Description

Traction rollers for combing machines

technical field

The invention relates to a combing head having at least one combing head installed between two bearing guards, the produced fiber web is conveyed by a conveying device on a guide device to a drawing hole which is laterally offset with respect to the center of the conveying device set so that the fiber web exiting and unfolding from the conveyor is bundled towards the draw hole and onto the next pair of draw rollers comprising a drive-mounted stationary roller and a press roller, the press roller The roller is mounted pivotable about a fixed axis of rotation, and in a screw-in operative position radially in the direction of the roller, the pressing roller is pressed by at least one spring member.

Background technique

Such devices and methods are already known in existing combing machines. Through the comber, the loose ends of the lap held by the nip device are combed by a circular comb. The unencumbered fiber tufts protruding from the nip overlap obliquely with the web conveyed back by the detaching roller, which is installed downstream of the nip, so that an entangled web is produced. This overlapping is also known as a joint. The result is a web with periodic irregularities called joints in the overlapping regions. Said regions lead to inhomogeneities in quality relative to the length of the web. In order to compensate for these inhomogeneities, the cohesive web is drawn eccentrically in order to bundle or form a fiber strand, since in this case the lines of the splice are arranged obliquely, resulting in a partial compensation of the period. As can be seen in the spectrogram of the formed combed sliver, a completely uniform distribution of splices still did not result. Rather, it is known that the piecing distribution phase of a comber shows a completely unevenly distributed piecing in the spectrogram. In order to compensate for the above, it is known that the movable or eccentrically rotating guide head is adjusted empirically, following the bundling of the fiber web, until the spectrogram of the combed sliver shows a better setting. As a result of this guide head which deflects the sliver on the drawing frame, the joining points of the individual slivers are displaced relative to each other, so that due to the offset structure of the guide head, the splicing can be partially compensated for each other or suppressed.

Contents of the invention

A disadvantage of the described prior art is that, for each machine, the setting of the guide head has to be found repeatedly and laboriously depending on the material, environmental conditions, etc. If deformations also occur during drafting on the draw frame, this results in a completely different phase of joint distribution. It is therefore not possible to provide any general criteria for the setting adjustment of the head.

In DE-A1-10300317.7, which has not yet been published, it is proposed that the draw-off openings, together with the draw-off rollers arranged below them, be arranged outside the web width for a further homogenization of the splice distribution. Therefore none of the fibers run in a straight line from the delivery device to the draw hole. In the first case, the fibers are deflected at least laterally, after which they enter the drawing holes. In order to achieve a very uniform distribution of splices, the fibers of the web extending close to each other withdraw from the conveying device to the drawing hole with different path lengths.

In US-PS3628219 a similar proposal is made for lateral biasing of the draw towards the width of the web. In this design, the offset structure of the pulling funnel with the pulling rollers described below is shown in full schematic form. From the illustrated embodiment it is clear how the lateral offset of the take-off rollers solves the structural design. Also in this case only a schematic solution is shown at a combing head without taking into account the overall design principle of the machine.

In principle, combers operated in practice have 8 combing heads which are arranged close to each other. In order to place or install the individual devices of the combing heads, in each case bearing cages are arranged between the combing heads, wherein in particular one of the draw-off rollers is installed, which is arranged downstream of the draw-off holes (such as the draw-off funnel) . The pressing rollers interacting with the traction rollers are in principle mounted on the traction table or pivotally mounted on the machine frame and are pressed in the screwed-in position by spring elements in the direction of the stationary drive traction rollers. The pivoting movement of the pressing roller can be realized by pivoting arms arranged at both ends of the pressing roller, at which ends of the pressing roller are integrated spring members and supporting bearings of the rotating shaft of the pressing roller. The drive for the press roller is in principle carried out in the screw-in operating position, in which the gear fixed to the press roller meshes with a further gear which is connected in a rotationally fixed manner to the drive pull-off roller superior. However, other possible drive systems are also conceivable.

The distance between the individual bearing housings (also referred to as combing head distribution) is based on the width of the combing device and should only be selected as necessary. The larger the distance selected, the longer the frame, and therefore the heavier the weight of the machine, which on the one hand makes the cost of the machine high and on the other hand increases the load on the floor.

According to these standards, it is proposed to design or support the rolling roll behind the drawing hole (driven drawing roller with pressure roller), so that the lateral deflection of the drawing hole is as effective as possible (in terms of dimensions) outside the width of the web. position, but the spacing between the bearing housings must be greater.

The solution to this problem consists in proposing to mount the pressing roller rotatably on one side of the pivoting device, with the free end of the pressing roller directed towards the bearing cage, relative to which the pressing roller has a minimum separation distance.

Therefore, the pulling center of the pulling roller is set at a very small distance from the pulling hole without any modification of the bearing cage.

It is further proposed that the pivoting device has at least one guide device, on which a bearing is arranged which can be offset in the longitudinal direction of the pivoting device, the bearing having a distance extending parallel to the pivot axis of the pivoting device The shaft, on which the press roller is mounted so as to be pivotable, is arranged on a pivoting device, between which pivoting device and the bearing a spring member is arranged.

This allows a compact and simple design to be obtained.

It is advantageously proposed that the guide means are formed by at least two pins which protrude into the bearing opening and that at least one compression spring is provided between the pins, which is supported on the pivoting means on the one hand and on the other hand. On the one hand, it is supported on one side of the bearing.

In order to maintain the pressure roller at a predetermined distance from the pulling roller, it is proposed to provide a stop element at the free end of the pin, which limits the movement of the bearing towards the free end of the pivoting device.

For a stable and simple support of the drive take-off roller, it is proposed that the fixedly mounted roller must have at least one clamping ring, by means of which the roller is fixed to the drive shaft in a torsionally fixed manner for clamping The ring holding means are located on the front face of this roller, which is located on the opposite side of the other removable bearing cage.

Thus, the take-off roller can be fixed to the drive roller without in each case any problems caused by a side pointing away from a particular side plate, since the distance between the sides of the take-off roller closest to the bearing cage is defined. Enter.

In order to achieve a secure, torsionally fixed connection to the drive shaft, preferably the clamping rings are arranged in each case in the region of both ends of the take-off roller.

Description of drawings

Further advantages of the invention will be shown and described on the basis of the following examples. The attached drawings include:

Figure 1 shows a schematic side view of a combing head of a combing machine;

Figure 2 shows a top view of the outlet of a known comber;

Figure 3 shows a top view of the laterally offset pull hole of Figure 2;

Figure 4 shows an enlarged side view in the region of the draw hole of Figure 2; and

Fig. 5 shows an enlarged side view of Fig. 3 in the area of the pulling hole, with the pulling roller of the invention.

Detailed ways

Figure 1 shows a schematic side view of a combing head 1 of a known combing machine. The supply rollers are mounted to rotate in a jaw arrangement 2 having a lower clamping plate 2b and an upper clamping plate 2a, said upper clamping plate 2a being mounted pivotable on the lower clamping plate 2b, said rollers performing continuous sports. This movement results in the periodic appearance of lap pieces W unwound from the lap (not shown) onto the circular comb 5 arranged to rotate beneath the jaw arrangement 2 . With the closed jaws 2, the ends protruding from the jaws are combed by the circular comb section 5a. Behind the jaw arrangement 2 are detaching rollers 6 which are arranged to rotate forwards and backwards. When what is known as the piecing process takes place, the detaching rollers 6 lay the yarn tufts clamped between them on top of the fiber tufts released by the jaw device 2, thereby creating an entangled fiber web. After this stacking process, also called piecing, the detaching roller 6 rotates again in the opposite direction and in the process draws the gripped fiber - via the jaw arrangement 2 opened again - away from the supply roller 3 and fixes it Cotton lap sheet W. Before its separation, the fixed comb 4 inserts a row of needles into the fiber tufts so that the rear of the web is combed as the fibers are drawn through said needles. The detaching roller 6 leaves a web having splice points arranged close to each other along its width. The fiber web is then conveyed to the drawing table 9 by means of a conveying device 8 designed as a pair of drawing rollers and introduced into the drawing hole 12 of the funnel 11 via a fiber web tray 7 arranged upstream as a material storehouse, And it is drawn out of the traction hole 12 by the downstream rolling roll 14 . The rolling roll 14 comprises a traction roller 14a and a pressure roller 14b, the traction roller 14a is fixed to the traction shaft 20 in a torsion-resistant manner, the pressure roller 14b is located at the lower part of the traction table 9 and can be rotated by a pivot arm 21 The pivot shaft 22 pivots. An end stop is additionally provided, not shown, which prevents further downstream pivoting of the pressure roller 14b in the position shown. A spring member 24 is incorporated in the pivot arm 21, which pivot wall 21 is supported at one end on the pivot arm itself and at the other end on a bearing 25 in which the axis of rotation of the pressing roller 14b is fixed. Due to the action of the spring member 24, the pressing roller 14b is pressed toward the pulling roller 14a. The movement of the bearing 25 along a guide (not shown) of the pivoting arm 21 is however limited by an end stop, so that in the shown operating position the pressing roller 14b does not directly contact the pulling roller 14a. The drive of the pressing rollers in the shown working position is produced by a gear connected to the pulling roller 14a and the pressing roller 14b, said pulling roller 14a and pressing roller 14b cooperating with each other in this position. These gears are described and shown in detail in FIGS. 4 and 5 . After the rolling roller 14, the fiber web that is now bundled into a fiber sliver passes through the drawing frame 16 together with the other sliver coming from the adjacent combing head 1 into the drafting device of the combing machine.

FIG. 2 shows the known structure at the outlet of the combing head 1 in a simplified top view. The combing head 1 is arranged between two laterally arranged bearing cages 30 which represent the lateral delimitation of the combing head and are provided with support positions for mounting the means of the combing head. The fiber web V output from the detaching roller 6 passes through a fiber web pan 7 to the take-off roller 8 and leaves the take-off roller 8 with a material width b, so as to then pass through a not shown rolling roller 14 (under the take-off table 9) The eccentric conveyance is through the drawing hole 12 of the funnel 11 which is inserted into the opening of the drawing table 9 . The drawing hole 12 is arranged exactly flush with an edge of the fiber web in this position, so that the fibers 8 enter the drawing hole 12 . The guide head 15 is arranged downstream of the draw-off roller 8 which deflects the sliver FB by 90° and guides it into a drafting device (not shown).

Traction eccentric construction means setting the joint lines in a diagonal direction, resulting in partial compensation of the joint period. This means that along the direction of web extension, joint lines are obtained which run in a diagonal direction and which are arranged one behind the other, but inhomogeneities are nonetheless clearly recognizable in the spectrum.

Figure 3 shows an arrangement similar to that of Figure 2, but this results in a more even distribution of joint points. In this case, the drawing openings 12 are arranged outside the web width b, which defines the conveying width relative to the drawing rollers 8 . The drawing holes 12 are arranged laterally offset with respect to the near-edge spacing c of the web. With this configuration, the entire web V is laterally biased on its way from the take-off roller 8 to the take-off hole 12 . This leads to less overlapping of the combing cycle or piecing cycle, which can also be seen in the spectrogram of the combed sliver.

A rolling roll 14 with a take-off roller 14a and a pressure roller 14b is shown in part. The shaft 20 , on which the take-off roller 14 a is secured against rotation, as well as the separation roller 6 and the delivery roller 8 are mounted in side bearing housings 30 . The pivot axis 22 of the pressing roller 14 b is shown in dashed lines, which pivot axis 22 is mounted on the underside of the traction table 9 . The traction table itself is mounted to pivot about an axis not shown and can be pivoted into a rest position. When the traction table is pivoted into this position, access to the traction roller 14a and the pressing roller 14b is possible. Simultaneously with the pivoting of the traction table 9, the pressing roller 14b is swiveled out of its working position into an inactive position.

In order to guide the web V more precisely to the laterally offset drawing hole 12, a web guiding device 10 is provided in FIG. In the illustrated embodiment, the web guiding device 10 is designed as a deflector plate which approximately guides the portion of the web that is removed from the drawing hole 12 . In addition to this, it is also possible to provide a guide plate on the side close to the hole. However, it is also possible to construct a solution without guide plates.

In an alternative embodiment not shown, the web guiding means 10 , for example substantially in the form of one or more guiding plates, are formed as an integral part with the drawing table 9 . The drawing table 9 can also be designed as a groove, so that the web material V is guided to the drawing hole 12 in the web guiding device, which is designed as a groove.

FIG. 4 shows an enlarged side view of the known embodiment from FIG. 2 , in the region of the pulling opening 12 the pulling table 9 is only schematically shown.

The shafts 20 of the conveying roller 8 and of the take-off roller 14a are in each case mounted in bearings L of the bearing cages. The take-off roller 14a is connected to the shaft 20 by means of screws S in a rotationally fixed manner. Coaxially fixed to the traction roller 14a is a gear Z1 which, in the operative position shown, cooperates with a gear Z2 which is fixedly connected to the pressure roller 14b.

The pressing roller 14b is rotatably mounted on the shaft 32 through a bearing L1. The shaft 32 is fixed between two bearings 25 which are guided in each case in a guide groove 26 provided in the pivot arm 21 (pivot means). The pivoting arm 21 is pivotally mounted on the underside of the traction table 9 via a fixing device 34 . Between the bearing 25 and the fixed shaft 22 is located a spring member (compression spring), said member pushing the bearing 25 and thus the pressure roller 14b towards the traction roller 14a. In this case, the bearings 25 are moved along the longitudinal hole 26 until they touch the end of this longitudinal hole 26 . This is at the same time an end stop, a free play still exists between the pulling roller 14a and the pressing roller 14b. As already described, in this position the two gears Z1, Z2 are in driving connection, so that the pressing roller 14b is also driven by the drive shaft 20 to which the pulling roller 14a is connected. The downstream pivoting movement of this pivoting arm 21 is limited by a stop element which is not shown in detail.

As can be seen from this embodiment, with this known design only a small lateral displacement of the draw hole is possible, since the particular left pivot arm 21 and the bearing 25 arranged directly opposite the bearing cage 30 can only Displacement to the bearing housing 30 by a limited amount. In cases where a large lateral displacement c of the draw hole 12 is desired, the separation distance A (see FIG. 2 ) between the two bearing cages 30 has to be increased, necessitating a significant intervention in the entire structural design, and the above-mentioned disadvantages may occur.

Therefore, a design embodiment of the present invention respectively proposes a support structure as shown in FIG. Sufficient lateral displacement of the draw hole 12 is enabled without any major structural design errors. Through the embodiment described later, the distance h between the front surface of the pulling roller 14a and the front surface of the pressing roller 14b and the bearing housing 30 is very small, so the lateral displacement of the pulling hole 12 can be designed to be greater than that according to FIG. 4 Possibilities for the design of the embodiment.

In the embodiment shown in FIG. 5 , the delivery roller 8 and the shaft 20 of the take-off roller 14 a are similarly mounted on a bearing L in a bearing housing 30 . The fixing of the take-off roller 14 a on the shaft 20 takes place in this case by means of a clamping ring R. In this case, the flange 36 is pushed against the contact surface 37 of the outer roller 38 of the take-off roller 14a by means of a clamping screw 38, which can be accessed from the surface side of the take-off roller 14a. Thus, the clamping rings R located between the flange 36 and the contact surface 37 are displaced in such a way that they establish a clamping action between the shaft 20 and the outer roller 38 between which an intermediate ring is arranged 40. This construction also ensures that the distance h between the surface of the take-off roller 14a and the bearing cage 30 is very small. Via this clamping screw 35 the gear wheel Z1 can also be connected in a rotationally fixed manner to the traction roller 14a. However, other fastening means are also conceivable.

The press roller 14b is rotatably mounted on the shaft 42 via a bearing L1. For ease of viewing, the fixing elements for axially fixing the pressure roller are not shown, nor are the cover parts for protecting the bearing L1 from dust.

The shaft 42 is connected to a bearing 25 provided on one side of the press roller 14 b which is displacedly guided through an opening (bored hole) 44 on a guide pin 45 . The guide pins 45 may be provided on one end with a threaded portion 47 by which they are fixed into threaded holes of the bearing portion 33 . At the opposite end, the guide pin is provided with a widened head 46 which prevents further displacement of a contact plate 48 similarly provided with an opening and displaceably mounted on the guide pin and arranged at between the bearing and the head 46 of the guide pin 45 .

Between the guide pins 45 is provided a spring member 24 which is supported at one end by the bearing member 33 and at the other end by the bearing 25a. Thus, the bearing is pushed towards the head 46, which engages the contact plate 48, limiting displacement movement. In this end position, the outer circumference of the pressure roller 14b has a smaller separation distance d relative to the outer circumference of the take-off roller 14a. At the same time, in this operating position, the gears Z1 and Z2 cooperate, thus driving the pressing roller via the shaft 20 . Since the fiber material FB is conveyed between the rolling rolls ( 14 a , 14 b ) during operation, this spacing distance d can be increased against the spring force of the spring element 24 . In this case the pressure exerted on the fiber material bundles (rolls) the fiber material so that the fiber sliver FB is formed with sufficient holding force.

This bearing part 33 is mounted to rotate on the shaft 22, which shaft 22 may be fixed by means of fixing means 34, for example on the underside of the traction table 9, as shown in schematic form. In order to keep the shaft 42 in an axially parallel position with respect to the shaft 20, and thus with respect to the pull-off roller 14a, the bearing components are mounted on the shaft 22 in at least two positions, either of which There is a distance between them.

In this embodiment, the traction table is fixed to pivot about a pivot axis between two support plates 30, not shown, so that in the unscrewed state, the traction roller 14a is accessible, facing the direction of the traction table 9. Simultaneously with the outward pivoting, the pressure roller 14b is also pivoted into the rest position.

The embodiment shown in this way ensures the spatial conditions available for an optimal implementation, because the design between the bearing cages thus ensures a sufficient lateral displacement of the traction bore 12 .

Claims (6)

1 has the combing machine that at least one is installed in the combing head (1) between two bearing cages (30), wherein the transport (8) that is directed on the device (9) of the fiber web of being produced (V) is transported to towing pad (12), this towing pad (12) side direction biasing ground, center (M) of this transport (8) relatively is provided with, therefore the fiber web quilt that leaves this transport (8) and launch is towards the towing pad boundling and be transported to down a pair of rolling roller (14), described rolling roller (14) comprises that one drives and hard-wired roller (14a) and one are mounted to the pressurization roller (14b) that can rotate around fixing rotating shaft (22), wherein should be pushed towards the radial direction of roller (14a) by at least one spring element (24) edge in screwing in the operating position by the pressurization roller, it is characterized in that, this pressurization roller (14b) is installed on the side of pivoting device (28) rotatably, the free end of pressurization roller (14b) points to bearing cage (30), this pressurization roller is this bearing cage (30) relatively, has minimum spacing distance (h).

2 combing machines according to claim 1, it is characterized in that, this pivoting device (28) has at least one guiding device (45), on this guiding device (45), bearing (25a) has been installed, this bearing (25a) can move along the longitudinal direction of pivoting device (28), wherein this bearing (25a) has axle (42), this axle (42) extends with pivotal axis (22) the parallel interval ground of the device that is pivoted relative to each other, pressurization roller (14b) is installed on this pivotal axis (22) pivotly, between pivoting device (28) and bearing (25a), this spring members (24) is set.

3 combing machines according to claim 2, it is characterized in that, this guiding device is formed by at least two pins (45), described pin (45) extend in the opening (44) of bearing (25a), and between pin, be provided with at least two pressing spring (24), this pressing spring (24) is supported on this pivoting device (28) on the one hand, is supported on the other hand on the bearing (25a).

4 combing machines according to claim 3 is characterized in that, at least one stop part (46,48) is arranged in the free end zone of pin (45), and this pin (45) defines bearing (25a) and moves along the free-ended direction of pivoting device.

5 according to each described combing machine among the claim 1-4, it is characterized in that, fixed installation roller (14a) has at least one holding ring (R), by the antitorque commentaries on classics of this roller of this holding ring (R) (14a) be fixed on that axle (20) is gone up and the clamping device (35) that is used for holding ring (R) is arranged on the front surface of this roller (14a), this front surface is arranged on the opposite of another dismountable bearing cage (30).

6 combing machines according to claim 5 is characterized in that, in each situation, are provided with holding ring (R) in two end regions of traction roller (14a).

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