EP0725032B1 - Flat sliver can - Google Patents

Description

The invention relates to a flat can for receiving sliver, that is delivered by cards or lines. The flat jug serves as a container to hold the delivered sliver as well as its transport to a further processing machine the spinning mill, through which the sliver from the flat can is removed again. In contrast to round cans, flat cans have the advantage that they set up more space and have it transported. The flat can can also use more sliver save as a corresponding round jug. Problematic is, however, the filling and emptying of the round can Flat can, because the sliver must not in any way in its Quality will be affected.

Known flat cans consist of two elongated, parallel ones Side walls and 2 end walls. All walls are perpendicular to the bottom of the jug arranged (EP 344 484).

The cross section of the flat can can be rectangular Shape, a rectangular shape with rounded corners (EP 344 484), a rectangular shape with rounded end pieces (DE-OS 40 15 938, Fig. 3A), or an oval shape. The appropriate form also accepts the can plate, which is known to be movable and lowered according to the filling status of the flat can or is lifted. As EP 344484 shows, it was common for flat cans that the can plate is positioned at the level of the can rim when empty is. The positioning is achieved by springs. The pantograph is intended to achieve that the can plate always remains horizontal during its lifting or lowering movement. Tilting movements nevertheless occur at high traversing speeds of the pot plate.

When filling with sliver, the flat jug is usually under the filling device is moved back and forth in the longitudinal direction of the can, so that the sliver is cycloid-shaped by this traversing movement on the can plate in the direction of an end wall the flat can is placed on the other end wall. Several stored sliver layers form a with increasing filling Band column that uses its own weight to hold the can plate slowly lowers until it stops at the bottom of the jug. The can plate as usual with other cans, points one down Stand area (can bottom) angled edge and lies with its angled surface except for a small gap on the Jug walls. According to the prior art (EP 344 484) Can plate supported on both ends by a coil spring, which the can plate in the unloaded state at the top Position the can rim.

Already when the first sliver layer is formed on the can plate there is a clear shift of the front wall the next closest loop in the direction of the can end. This local shift results from those caused by repentance the braking and acceleration forces occurring in the traversing movement. This uncontrolled displacement of the sliver leads to the disadvantage that especially during the formation of the First layer the sling over the can edge on the front is pressed. This shift is the greater, the greater the delivery speeds are, so the use of Flat cans the production speed of the card or draw frame impaired. This also applies to the following layers of sliver, albeit the shift due to growing stiction is steamed between the layers.

This shift is not only detrimental to quality the slivers on the can end, but the disturbed Sliver storage also leads to difficulties later Withdrawal of the sliver from the flat can.

The positioning of the can plate according to EP 457 099 (column 7, 41.-44. Line) even assumes that the can plate is still should be positioned somewhat higher than the top of the can, namely up to the bottom edge of the card's turntable or route. This way you can achieve the first layers of the sliver a required contact pressure. However, that has the Disadvantage that the can plate of the flat can directly on the turntable grinds at the start of the filling. A worn turntable surface affects the sliver to be removed.

With increasing height of the sliver column, which consists of a variety consists of layers of sliver lying on top of each other, theirs grows Dimensions. Especially when the flat jug hits the respective one Reversal point of the oscillation, the effect occurs that the Sliver column due to its inertia in the direction of the respective Front side fluctuates. The sliver column fluctuates in their entirety. This swaying is annoying as it is still running sliver storage affected. This not only leads to changes in density opposite the sliver near the front other storage positions, but it can also happen that sliver loops on the front side by swaying the sliver column in the current gap between sliver and Can wall slip and become jammed, which is the case when the tape is pulled off later the risk of tape breakage increases. The swaying of the sliver column continues to cause an undesirable moment of force on the Jug wall and the jug plate.

To counteract this disadvantage, according to EP 344 484, FIG 1 and 2 proposed on the inside of the elongated side walls one pantograph each (also Scherengitter or Nürnberger Called scissors) to arrange a parallel guidance of the can plate to secure to the wall. However, this is an increased one constructive effort, the tilting of the can plate not safe at high traversing speeds of the flat can avoids.

Those that are symmetrically opposite on the longitudinal edges of the can plate Pantographs cannot prevent the can plate at increased traverse speeds for tipping in Tends towards its longitudinal axis. There is a risk of tilting opposite the wall. By tilting the can plate but there is also the disadvantage that the individual suddenly loaded Spiral spring bends out of its vertical axis.

The problems mentioned so far have been introduced with the flat can prevented in practice because delivery speeds like them are common with the round jug, could not be realized.

The object of the invention is to fill an iridescent Flat jug to achieve proper tape storage, which too error-free tape removal enables and economic Filing speeds as possible with round cans are.

A feature of the invention is that the can plate has a bottom, the lowered compared to the edge of the can in the empty position is. The depth of the depression in relation to the edge of the can corresponds about a stretch, the two superimposed sliver layers take in. It is advantageously achieved that sliver loops at the beginning of the filling, not beyond the edge of the can can be relocated. The angled edge of the can plate points towards the upper edge of the can rim and lies on the Can wall. This jug edge angled upwards is enough about to the top of the can. But it is also possible that the angled edge of the can plate angled to the base of the jug and is also parallel to the can wall. In In such a case, the can plate will be empty when the Flat can at a stop below the upper edge of the can held. The stop is positioned on the can wall that the can plate in the lowered opposite the can edge Position is held.

An advantageous further embodiment is that the two End sections of the can plate to the middle section as surfaces are inclined. The inclination of these surfaces can be changed and fixed be. This embodiment ensures that the Contact pressure of the sliver against the turntable in the end sections is reached earlier than in the middle section. This also prevents the slings from moving.

Another feature is that the surface of the can bottom is structured so that the static friction to the sliver increases is.

With these technical features, the advantage is achieved that the first sliver layers on the can plate when filling do not move when traversing and a clean storage of the Tapes in the desired cycloid shape over the entire length of the can plate.

Another feature of the invention is that the side walls of the Flat jug near the top edge or curled over the entire surface are. This corrugation of the side walls results numerous resistance points that lead to an additional and thus increased static friction between the fiber band column and the can wall to lead. With this constructively simple measure it is possible to do that To dampen fluctuations in the sliver column due to inertia. This also has the advantage of increased bending stiffness the side wall.

Another feature of the flat can is that between two coil springs arranged in the area of the end walls are, only a pantograph is arranged. This single pantograph is located in the middle of the jug bottom and at the crossing points this pantograph are arranged horizontally struts, which are rotatably mounted in the respective crossing point. The The ends of the struts are with the opposite spiral spring articulated. It is therefore in every position of the can plate and avoided at high traversing speeds that the spiral spring bends out of its vertical position as caused by swaying the sliver column can.

Figur 1

Flachkanne in einer Changiervorrichtung einer Strecke

Figur 2

Lagerung des Faserbandes im Bereich der Stirnwandung bei bekannten Flachkannen

Figur 3 a

Seitenansicht des Kannentellers einer Flachkanne

Figur 3 b

Seitenansicht einer weiteren Ausführungsform des Kannentellers einer Flachkanne

Figur 3 c

Aufbau einer Flachkanne

Figur 3 d

Draufsicht auf den Kannenteller einer Flachkanne

Figur 4

Wandung einer Flachkanne

Figur 5

Wandung einer Flachkanne mit Anschlag für Kannenteller

Figur 6

Flachkanne mit bekannter, unterer Kannenwulst

Figur 7

Flachkanne mit neuer Anordnung der unteren Kannenwulst

dargestellt.The invention is based on an embodiment of the

Figure 1

Flat can in a traverse device of a stretch

Figure 2

Storage of the sliver in the area of the end wall in known flat cans

Figure 3 a

Side view of the can plate of a flat jug

Figure 3 b

Side view of another embodiment of the can plate of a flat can

Figure 3 c

Structure of a flat can

Figure 3 d

Top view of the can plate of a flat jug

Figure 4

Wall of a flat jug

Figure 5

Wall of a flat can with a stop for can plates

Figure 6

Flat jug with known, lower jug bead

Figure 7

Flat can with a new arrangement of the lower can bulge

shown.

According to Fig.1, the sliver is delivered from the drafting device to the turntable 2. The delivery direction A of the sliver is determined by the arrow. The turntable 2 with its mouth of the tape guide channel 1 rotates stationary and is surrounded by a machine table 3. The sliver leaves the mouth in the turntable 2 and is placed in the flat can 4 in a cycloid form. The storage of the sliver is not shown. Each individual layer of sliver is laid down over the entire width and length of the can plate. The can plate is movably arranged on the can wall. With an increasing number of sliver layers, the can plate must be able to lower towards the can base.
The movement of the can plate can be carried out, for example, by an externally controlled lifting mechanism which is arranged under the can plate. The lifting mechanism is in engagement with the can plate.
Another possibility is that springs are arranged below the can plate, which move depending on the load on the can plate from an initial position (empty flat can) to a lowered position.

A filled flat can is used for further processing of the tape transported to a spinning machine. The width of a flat jug therefore corresponds to the working width of a single spinning station. The flat can 4 can have a rectangular or oval base. The rectangular base area is preferably rounded Corners. The flat can 4 becomes one below the turntable 2 Length or card in the longitudinal direction (according to double arrow B) back and forth (shifts) so that the pot plate (in Figure 1 not shown) over its entire length with sliver is occupied. In order to be able to change the flat can 4, this is available with its lower can bulge 50 on a roller conveyor 6. Die Roller conveyor 6 consists of a large number of freely movable rollers, which are arranged side by side and at least the traversing path correspond. The flat can 4 is oscillated on this roller conveyor 6. Located on the side boundary of the roller conveyor 6 guide rollers 7 and 70 spaced apart on both sides, (usually more than two per side) that the flat can 4 in Give a tour of the stand area. For the period of change the flat can in the upper third (below the lower can bulge 5) on both sides by a traverse bracket 8 and 80 detected, these traversing brackets with a chassis 9th keep in touch. This chassis 9 has one here Not shown drive. The drive becomes one Program for filling the flat jug 4 controlled. The chassis 9 is guided along the rail 10.

FIG. 2 documents the can structure known up to now according to EP 344 484, as can be seen within the can wall 13 and below the can plate 14. A spiral spring 11 and a pantograph 12 are arranged on each of the long sides.
The flat jug is moved back and forth, ie it changes. The traversing speed is decelerated to the value zero at the reversal point, in order then to accelerate to the traversing speed immediately after passing through the reversing point. In the opposite reversal point, the analogous braking and acceleration process takes place. As a result of the braking and accelerating, known flat cans after the formation of the first sliver layers for the end sling are displaced beyond the edge of the can (see FIG. 2). This is very unfavorable, especially in the high-speed area of traversing. Since, according to FIG. 2, the can plate 14 in known cans is arranged in one plane with the edge of the can or a little higher, a shifting of the end sling is favored. In practice it has been shown that the pressure of the sliver on the turntable intended by the raised can plate is not sufficient to hold the slings in the area of the end wall of the flat can.
This design of the can plate and its arrangement (Fig. 2) avoids the formation of uniform sliver layers and later hinders the pulling of the sliver from the flat can. There is a risk of the tape breaking.

To shift the first sliver layers when traversing the To avoid flat jugs, the pot plate will cover its entire Length lowered compared to the can rim (upper can bead 5). Figure 3a shows this fact. The depth of the lowering of the Can plate 140 opposite the can rim corresponds approximately to one Line that take two layers of sliver lying on top of each other.

With this lowering it is achieved that the first two layers of tape can not be pressed over the edge of the can, but are held in their storage position by the wall. There between the can plate and the can wall for reasons of mobility the can plate must be kept a narrow gap, parts of the sliver could become jammed. Around To avoid such jamming, it is suggested the can plate 140 to bend upwards. The angled surface forms an edge. The edge is parallel to the wall of the flat can and ends just below the top of the can (Fig. 3a).

Figure 5 shows the lowering of a can plate 142, the Lowering is forced by the stop 51. The stop 51 is arranged on the inner wall below the upper can bead 5. When the can plate 142 is lifted this is always the stop 51 is arranged below the upper can bead 5. The stop 51 is not an additional component but can expediently taken into account when shaping the can wall will.

However, an embodiment of the can plate is also feasible in which the two end sections of the can plate are angled in accordance with an inclined plane (FIG. 3b). Slightly spherically curved surfaces can also be used.
The length L of each of the two inclined planes corresponds to a deposit radius of the cycloidally laid fiber sliver. The height H of this inclined plane corresponds to a sufficiently small free space between the top of the can and the flat part of the can plate 141, as is present at the start of filling. The inclined planes in the end sections of the can plate have the effect that the first sliver layer and the immediately following ones in this area are pressed onto the machine table 3 earlier and stronger than the rest of the layers in the middle section. The increased pressure of the sliver layers between the can plate 141 and the machine table 3 in the end sections of the can plate prevents the sliver layers from shifting.

To further increase the adhesion between sliver layers and can plate increase, the can plate receives a structured surface 17 (Fig. 3d). But it is also a version with a nubbed surface conceivable.

Figure 3 c shows a flat can in the inner structure. The can plate 140 is made by a single pantograph 120 worn, which is arranged centrally below the can bottom 140 is. At the crossing points of the pantograph are horizontal Position struts 16, 160 arranged which are rotatable in the respective Crossing point are stored. The ends of the struts are with the each opposite annular spring 110, 111 articulated. The articulated connection is achieved by the ends of the struts (16, 160) to eyelets (16.1, 16.2; 160.1, 160.2) are. It is therefore in every position of the can plate and at high Traversing speeds avoided that the spiral spring buckled from its vertical position is done as before Fluctuations of the sliver column is caused.

With increasing sliver deposition due to the sliver weight the can plate is pressed down. It forms from the multitude of sliver layers a sliver column, which as a result their inertia in the reversal points of the oscillation tends to fluctuate. The swaying develops forces on the The can wall and the traversing bracket work. For this swaying the sliver during the traversing of the flat can dampen, the side walls near the upper edge (upper Jug bead 5) corrugated. But it can also cover the entire side be curled. The corrugation 18 is such that starting in Near the upper can bead 5 of the can 4, wave crests and valleys follow the perpendicular to the can stand, i.e. towards the lower edge show (Figure 4). But it is also a different version feasible, i.e. Wave peaks and valleys run parallel to the Upper and lower edge of the side wall. The corrugation 18 creates numerous Resistance points that lead to an increased adhesion between Guide the sliver column and the can wall. The advantage is, that a fluctuation in the sliver column is reduced.

As already shown, the flat can 4 has an upper can bead 5 and a lower can bulge 50. Upper and lower can bulge 5, 50 are known to protrude laterally at the same distance beyond the can wall. This known condition is documented Figure 6. There are excerpts of a flat can 4 and 40 under one spinning station S1 and S2. Each flat jug has about the width of a spinning station, with a small side distance a remains between the adjacent flat cans 4, 40. Because of this Side distance a is small, and to make changing the can easier, guide rails are arranged on the base of the spinning machine, Extracted guide rail LS1, LS2 and LS3. These guardrails shorten the side distance a in the area of lower can bead 50. It can jam when changing the can the flat can come because the tolerance of the side distance a is tight, which can lead to delays in changing the can. Out for this reason, the flat can is designed so that the lower one Jug bead 50 is displaced inwards. The result is that the Flat can on the upper can bead 5 is wider than on the lower can bead 50. Between guardrail and lower can bead a distance is obtained through this measure, the corresponds to half a side distance a. This makes it possible to increase the tolerance in the area of the guardrails, so that a Jamming of the flat jug when changing is avoided. Figure 7 shows the inventive design of the flat can in the area the lower can bulge 50.

Claims (5)

1. A flat-top can for receiving textile sliver, the walls of the flat-top can being formed from two longitudinally extending side walls and two end walls enclosing a substantially rectangular base area, and the flat-top can having an upper bead (5) and a lower bead (50), wherein the width of the flat-top can is determined by the distance of the can bead of one side wall from the can bead of the opposite side wall, characterized in that when the side walls are arranged parallel the lower can bead (50) is offset with respect to the upper can bead (5) so that the flat-top can is wider at the upper can bead (5) than at the lower can bead (50).
2. A flat-top can according to Claim 1, characterized in that the lower can bead (50) does not extend substantially beyond the can wall laterally.
3. A flat-top can according to one or both of Claims 1 and 2, characterized in that the side walls of the flat-top can are corrugated in the vicinity of the upper can bead (5) thereof.
4. A flat-top can according to one or both of Claims 1 and 2, characterized in that the side walls of the flat-top can are corrugated from the upper can bead (5) as far as the lower can bead (50).
5. A flat-top can according to one or more of Claims 1 to 4, characterized in that a stop (51), which is arranged below the upper can bead (5), is formed by the can wall itself on the inside thereof.

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