EP0353617A1 - Apparatus for depositing a texile sliver in a can - Google Patents

Abstract

The invention relates to a device for depositing a textile sliver (14) into a can (1), with an outlet elbow (6) which can be rotated about an essentially vertical axis and which, with its mouth (9), faces a fixed wall (13). ends, which protrudes into the mouth cross section of the outlet elbow (6). The object of the present invention is to simplify a device of the type mentioned at the outset while protecting the sliver. This object is achieved in that in the direction of rotation (D) behind the mouth (9) of the outlet elbow (6) a moving with the outlet elbow (6) moving against the fixed wall (13) directed pressure piece (15) is arranged, wherein the coefficient of friction of the wall (13), measured in the direction of rotation (D) of the outlet elbow (6), is greater than the coefficient of friction of the pressure piece (15).

Description

The invention relates to a device for depositing a textile sliver into a jug, with an outlet bend which is rotatable about a substantially vertical axis and which ends with its mouth in front of a fixed wall which projects into the mouth cross section of the outlet bend.

Devices of the type mentioned are used to deposit the slivers fed from a card in so-called spinning cans. From there, the slivers are then fed to further processing stations.

A device of the type mentioned is known from EP-A-220 328. There, the sliver is conveyed by a pair of calender rolls into the rotating outlet elbow and from there falls down into a can that moves relative to the rotating outlet elbow. The relative movement between the can and the rotating outlet elbow is required to lay the sliver in a cycloid pattern. In the known device, the fixed wall partially protrudes into the cross section of the outlet elbow. This is to prevent the sliver from clogging the outlet manifold by pulling the frictional forces between the fixed wall and the sliver moving past the fixed wall through the rotating outlet elbow, thereby supporting the drive of the sliver by the two calender rolls. So that The sliver does not stick to the wall, the mouth of the outlet elbow is inclined downwards so that the sliver strikes the fixed wall from above at an angle.

Although it appears possible that the known device can avoid clogging of the outlet elbow and that the conveying work of the calender rolls can be supported, the sliver is subjected to undesirable stresses when it emerges from the outlet elbow. Since the relative speed between the mouth of the outlet elbow and the fixed wall should be lower than the peripheral speed of the outlet elbow, a relative speed also occurs between the emerging sliver and the fixed wall. This relative movement is superimposed by a further relative movement which results from the fact that the sliver occurs obliquely from above against the fixed wall. This affects the fiber sliver. In addition, the known device for the advance of the sliver also requires the driven calender rollers arranged above and in front of the outlet manifold, so that the relative speed between the outlet manifold and the fixed wall must be coordinated with the advance speed of the calender rollers in order to further damage the sliver avoid. As a result, complex control is required.

The object of the present invention is therefore to simplify a device of the type mentioned at the same time while protecting the sliver.

This object is achieved in that in the direction of rotation behind the mouth of the outlet elbow is arranged with the outlet elbow moving, directed against the fixed wall pressure piece, the coefficient of friction of the wall, measured in the direction of rotation of the outlet elbow, is greater than the friction coefficient of the pressure piece.

After the sliver leaves the mouth of the outlet elbow, it comes to rest on the fixed wall. When exiting the outlet elbow, there is no relative movement between the fixed wall and the sliver. The sliver is pulled out of the outlet elbow from the fixed wall, more precisely by being clamped between the pressure piece and the fixed wall. It is therefore no longer necessary to provide a pair of calender rolls in order to advance the sliver through the outlet elbow. Thus, three goals are achieved at the same time: firstly, a structural and control-related simplification of the device, secondly, protection of the sliver and thirdly, the elimination of the speed adjustment of calender rolls. In the direction of rotation behind the pressure piece, the sliver deposited on the wall can be directed downwards by a scraper, while the fixed wall is cleaned at the same time. With the device according to the invention, the tape can be deposited practically independently of the speed, with deposit speeds being achieved which are far above those which are possible with conventional devices.

According to a preferred embodiment, the outlet elbow opens into a plane which is essentially perpendicular to the fixed wall.

This has the advantage that the sliver at Impact on the fixed wall is diverted only in one level, which contributes to the further protection of the belt.

The fixed wall is advantageously designed as an inner wall of a rotating body. In the case of conical or spherical rotating bodies, it is possible to change the laying radius of the fiber sliver by adjusting the height of the outlet elbow, since the mouthpiece must then move radially outwards or radially inwards. Although this radial adjustment is omitted when the fixed wall is designed as the inner wall of a hollow cylinder, this configuration is preferred because it is structurally simple and is sufficient for most applications.

According to an advantageous development, the fixed wall is formed with a substantially vertically oriented corrugation. The corrugation causes the friction of the fixed wall in the tangential direction, i.e. the direction of rotation of the outlet elbow is increased, while it can be kept very low in the vertical direction, so that the sliver can fall downward into the spinning can only by gravity at low belt speeds behind the pressure piece.

In a particularly advantageous manner, the pressure piece can be designed as a sliding guide attached to the mouth of the outlet elbow and tangentially adhering to the mouth of the outlet elbow and tangentially clinging to the fixed wall. As a result, the number of moving parts is kept low, which contributes to the structural simplification of the device. On the other hand, the pressure piece can also advantageously be designed as a rotatable roller, the axis of rotation of which is essentially parallel to the fixed wall. The lower coefficient of friction of the roller compared to the fixed wall is measured in this embodiment according to the rotary bearing of the roller. It does not matter whether the surface of the roller has a low coefficient of friction, since its surface does not move relative to the sliver. Although a movable component is added with a rotatable roller, this embodiment can be advantageous in particular for devices with lower belt speeds, since a roller, as a rotating body, can be easily produced.

Although, depending on the design of the fixed wall and the respective belt speed, gravity may already be sufficient for the fiber sliver to fall down behind the pressure piece, according to a preferred embodiment, an inclined surface that leads the fiber sliver down the wall is arranged behind the pressure piece in the direction of rotation of the outlet piece . This inclined surface is particularly advantageous when the device is intended for high belt speeds. The inclined surface causes the sliver pressed against the wall by the pressure piece to be stripped from the fixed wall.

The mouth of the outlet elbow is particularly preferably formed by a gas injector, to which the pressure piece adjoins. It is possible to automatically pull the sliver into the outlet elbow and press the beginning of the sliver against the fixed wall. As soon as the pressure piece detects the beginning of the sliver and presses against the fixed wall, the gas injector can be switched off.

It is also favorable if the inner cross section of the mouth of the outlet elbow tapers conically in the conveying direction of the sliver. The sliver can be very compactly pulled out of the outlet elbow and put down. This not only achieves a higher degree of filling of the cans, the sliver is also less susceptible to external mechanical influences.

If the pressing piece has a substantially horizontally extending groove opening into the conveying path of the sliver, which extends essentially from the mouth of the outlet elbow to a pressing surface running essentially parallel to the fixed wall, the sliver can be in this groove during the laying process be performed. On the other hand, when the sliver is inserted, that is to say when the gas injector is in operation, this groove has the effect that the air required for the insertion of the sliver can escape in a simple manner without it being trapped behind the mouth of the outlet elbow.

In order to promote the beginning of the sliver when it is drawn into the gap between the pressure piece and the fixed wall, it is advantageous if the pressure piece adjoining the gas injector of the outlet elbow forms a mouthpiece channel, which is on the one hand from the sliding guide and on the other hand through an opposite flow wall is formed. The opposite flow wall causes an air flow that is aimed precisely in the gap between the pressure piece and the fixed wall. The beginning of the sliver is therefore conveyed into this gap.

The targeted air flow to introduce the beginning of the sliver into the gap between the fixed Wall and the pressure piece can be easily achieved in that the flow wall has substantially the same curvature as the sliding guide.

If an air slot is left in the flow wall, excess air can simply escape without causing an air congestion.

The gas injector is advantageously connected to a control circuit which switches off the air supply to the gas injector as soon as the beginning of the sliver has reached the pressing piece. Then the transport of the sliver through the discharge elbow is taken over by the fixed wall, past the mouth of the discharge elbow.

According to a preferred embodiment of the invention, the outlet elbow, the gas injector and the pressure piece are arranged on a turntable, the inclined surface arranged behind the pressure piece being formed as part of the edge of the turntable and the turntable being fitted with the edge into the fixed wall. In this way, a structural unit is achieved which can be easily removed downward from the housing having the fixed wall for maintenance or replacement purposes.

The edge is advantageously made of plastic. This has the advantage that the edge can shrink in relation to the fixed wall, so that there is only minimal play between the edge and the wall.

• Fig. 1 in einer Seitenansicht eine teilweise geschnittene erfindungsgemäße Vorrichtung, gemäß einer ersten Ausführungsform,
• Fig. 2 eine vergrößerte Ansicht auf einen Teil des Drehtellers der Vorrichtung aus Fig. 1, teilweise geschnitten entlang der Linie II-II,
• Fig. 3 einen Schnitt durch Fig. 2 entlang der Linie III-III,
• Fig. 4 einen Schnitt entlang der Linie IV-IV aus Fig. 2,
• Fig. 5 einen Schnitt entlang der Linie V-V aus Fig. 2,
• Fig. 6 einen Schnitt entlang der Linie VI-VI aus Fig. 2 und
• Fig. 7 in einer ähnlichen Ansicht wie in Fig. 2 eine schematische Darstellung einer weiteren Ausführungsform.

Exemplary embodiments of the invention are explained in more detail below with reference to a drawing. Show it:

• 1 is a side view of a partially sectioned device according to the invention, according to a first embodiment,
• FIG. 2 shows an enlarged view of part of the turntable of the device from FIG. 1, partly in section along the line II-II, FIG.
• 3 shows a section through FIG. 2 along the line III-III,
• 4 shows a section along the line IV-IV from FIG. 2,
• 5 shows a section along the line VV from FIG. 2,
• Fig. 6 is a section along the line VI-VI of Fig. 2 and
• Fig. 7 in a similar view as in Fig. 2 is a schematic representation of another embodiment.

1 shows a device according to the invention for depositing a textile sliver into a spinning can 1. The device comprises a housing 2 in which a turntable 3 which is rotatable relative to the housing 2 about an essentially vertical axis is arranged. The turntable 3 is held in the housing 2 via a bearing 4. Above the bearing 4, a pulley 5 is fastened to the turntable 3, around which a drive belt, not shown, can be placed, which leads to an electric motor, also not shown. The turntable 3 can be rotated relative to the housing 2 by means of the motor, the belt and the pulley 5.

On the turntable 3 is a rotating with it Outlet manifold 6 attached. The outlet elbow 6 connects to a fixed pipe 8 via a rotary coupling.

The mouth of the outlet elbow 6 is formed by a gas injector 9 mounted on the turntable 3. Such a gas injector 9 is explained in more detail in EP-A-261 330, which is why the details of such a gas injector are not discussed in detail.

The gas injector 9 is connected via an air line 10 to a compressed air source 11. The air line 10 leads through the rotary coupling 7, so that the upper part of the air line 10 is fixed and the lower part of the air line rotates with the outlet manifold.

The housing 2 has a base plate 12 lying approximately at the level of the turntable 3, which surrounds the turntable 3 with a cylinder wall 13. The cylinder wall 13 is fixed relative to the turntable 3.

In the embodiment shown here, the sliver can 1 is moved relative to the housing 2, so that a relative movement is generated between the rotating turntable 3 and the sliver can 1, which results in the storage of the sliver 14 in the sliver can 1 in cycloid form. The same can also be achieved if the housing 2, like the turntable 3, is rotated about an axis parallel to the axis of rotation of the turntable 3. Such devices have long been known from the prior art.

As can be seen clearly from FIG. 1, the cylinder wall 13 projects into the mouth cross section of the outlet elbow 6. More specifically, the cylinder wall 13 covers the Mouth cross section of the outlet elbow 6 completely.

As can still be seen better from FIG. 2, a pressure piece 15 is arranged behind the gas injector 9 in the direction of rotation D of the outlet elbow 6 behind the gas injector 9 and moves against the stationary cylinder wall 13, the coefficient of friction of the cylinder wall 13 in the direction of rotation D of the outlet elbow 6 is greater than the coefficient of friction of the pressure piece 15. For this purpose, the fixed cylinder wall 13 is provided with a substantially vertically oriented corrugation 16.

The pressure piece 15 is fastened to the gas injector 9 and, on the one hand, conforms tangentially to the mouth of the gas injector 9 as a sliding guide and, on the other hand, tangentially to the fixed wall 13.

The gas injector 9 and pressure piece 15 are mounted on a pivot axis 17 which is aligned parallel to the cylinder wall 13. On the pressure piece 15 there is also a pivotally connected lever 18 which is supported on the base plate of the turntable 3 via a spring 19. As a result, the pressing piece 15 is always pressed elastically resiliently against the cylinder wall 13 with a pressing surface 20. In Fig. 2, the pressing surface 20 is shown spaced from the fixed wall 13, since there is already the sliver 14 between the pressing surface 20 and the fixed wall 13.

As can be seen particularly well from FIGS. 3 and 6, in the direction of rotation D of the outlet elbow 6, behind the pressure piece 15, more precisely behind the pressure surface 20, an inclined surface 21 adjoins the Sliver 14 deflects downwards. The inclined surface 21 is provided by a recess 22 in the edge 23 of the turntable 3. The turntable 3 is fitted with its edge 23 into the cylinder wall 13, so that there is practically no play between the edge 23 and the cylinder wall 13.

Looking at Fig. 1, it can be seen that the outlet manifold 6 or the gas injector 9 opens into a plane which is arranged at right angles to the cylinder wall 13. Since the cylinder wall is oriented vertically in this embodiment, the gas injector opens horizontally. The gas injector converges conically, so that the sliver 14 is tapered and compressed. 3 and 5, the sliver emerging from the gas injector is guided in a groove 24 which opens into the conveying path of the sliver 14 and from there reaches the pressing surface 20. The groove 24 forms one half a mouthpiece channel of the gas injector, which is completed from the other side by a flow wall 25. The flow wall has essentially the same curvature as the sliding guide or the groove 24. An air slot 26 is provided on the underside of the flow wall 25, through which excess air can escape, so that an air build-up behind the gas injector 9 is avoided. The gas injector 9 is connected to a control circuit 27 which switches off the air supply to the gas injector 9 as soon as the beginning of the sliver 14 has reached the pressure piece 15. The pressure prevailing in the air line 10, which changes when the sliver 14 is introduced into the gas injector, can be used for this control. It is also possible to use the deflection of the pivoting lever 18 when the sliver 14 is inserted into the gap between the fixed wall 13 and the pressure piece 15.

The function and the mode of operation of the device according to the first exemplary embodiment are explained in more detail below. First, the turntable 3 is driven via the pulley 5 and set in rotation. Compressed air is then supplied to the gas injector 9 by the compressed air source 1 via the air line 10, as a result of which a flow occurs in the pipeline 8 and in the outlet elbow 6. This air flow sucks a sliver 14 through the pipe 8 through the gas injector 9 into the gap between the pressure piece 15 and the fixed cylinder wall 13. As soon as the sliver has passed the gas injector 9, the pressure in the air line 10 increases, so that the control circuit 27 interrupts the air supply to the gas injector. Air which is at the time before the mouth of the gas injector 9 can escape through the air slot 26. As soon as the fiber sliver 14 is clamped between the pressure piece 15 loaded by the spring 19 and the fixed cylinder wall 13, the conveyance of the fiber sliver through the outlet elbow is achieved exclusively by this clamping action: the fiber sliver 14 is held by the pressure piece on the cylinder wall 13 while being held the outlet manifold 6 rotates with the turntable 3. Since the pressure piece 15 has a very smooth surface, it can move with the mouth or the gas injector 9 of the outlet elbow 6 without the sliver 14 being moved as well. Rather, the sliver 14 remains, seen in the circumferential direction of the outlet elbow 6, stationary on the cylinder wall 13. As soon as the pressing piece 15 has released the sliver 14, it can slide downwards by gravity, since the corrugation 16 is oriented vertically and only an increase in the Coefficient of friction in the circumferential direction of the outlet elbow 6 causes, but not in the vertical Direction. The sloping surface 21, which is formed in the edge 23 of the rotary plate 3, presses the sliver 14 downward, so that it moves helically downward into the spinning can 1. Since the spinning can 1 is rotated relative to the housing 2 of the device about an axis lying eccentrically to the turntable axis, the sliver 14 is deposited in the spinning can 1 in a cycloid shape.

A further exemplary embodiment of a device according to the invention is shown schematically in FIG. 7. This device corresponds essentially to the device according to FIGS. 1 to 6, which is why identical reference numerals are used for the same and similar components. Instead of the pressure piece designed as a sliding guide, however, a pressure roller 28 is provided in the second exemplary embodiment, which presses the fiber sliver 14 against the cylinder wall 13 after exiting the gas injector 9. Otherwise, the function is the same as in the first embodiment.

Although in the embodiment described here the fixed wall is designed as a cylinder wall, it is also conceivable that the fixed wall can be designed as the inner wall of a cone or a hemisphere open at the bottom. It would then be possible to vary the distance between the mouth of the outlet elbow and the axis of rotation of the turntable.

Furthermore, this embodiment is described using a moving spinning can. But it is also possible that the housing 2 of the turntable 3 itself is driven about an axis parallel to the axis of rotation of the turntable 3 in order to achieve a cycloidal storage of the sliver in the spinning can.

Claims (19)

1. Device for depositing a textile sliver (14) in a jug (1), with an outlet bend (6) rotatable about a substantially vertical axis, which ends with its mouth (9) in front of a fixed wall (13), which in protrudes into the outlet cross section of the outlet elbow (6),
characterized,
that in the direction of rotation (D) behind the mouth (9) of the outlet bend (6) a pressure piece (15), which moves with the outlet bend (6) and is directed against the fixed wall (13), is arranged, the coefficient of friction of the wall (13) measured in the direction of rotation (D) of the outlet elbow (6) is greater than the coefficient of friction of the pressure piece (15). 2. Device according to claim 1, characterized in that the outlet elbow (6) opens into a plane which is substantially perpendicular to the fixed wall (13). 3. Apparatus according to claim 1 or 2, characterized in that the fixed wall (13) is designed as an inner wall of a rotating body. 4. Device according to one of claims 1 to 3, characterized in that the fixed wall (13) is designed as an inner wall of a hollow cylinder. 5. Device according to one of claims 1 to 4, characterized in that the fixed wall (13) with a substantially vertically oriented corrugation (16) is formed. 6. Device according to one of claims 1 to 5, characterized in that the pressure piece (15) as at the mouth (9) of the outlet elbow (6) attached and tangential to the mouth (9) of the outlet elbow (6) and on the other hand is formed tangentially to the fixed wall (13) sliding guide. 7. Device according to one of claims 1 to 6, characterized in that the pressure piece (15) is designed as a rotatable roller (28) whose axis of rotation is substantially parallel to the fixed wall (13). 8. Device according to one of claims 1 to 7, characterized in that in the direction of rotation (D) of the outlet elbow (6) behind the pressure piece (15) a sliver (14) on the wall (13) downward sloping surface (21) is arranged. 9. Device according to one of claims 1 to 8, characterized in that the mouth of the outlet elbow (6) is formed by a gas injector (9) to which the pressure piece (15) connects. 10. Device according to one of claims 1 to 9, characterized in that the inner cross section of the mouth (9) of the outlet elbow (6) in the conveying direction (F) of the sliver (14) tapers conically. 11. The device according to one of claims 1 to 10, characterized in that the pressing piece (15) is a substantially horizontal and in the Conveying path of the sliver (14) has an opening groove (24) which extends essentially from the mouth (9) of the outlet elbow (6) to a pressing surface (20) running essentially parallel to the fixed wall (13). 12. The device according to one of claims 1 to 11, characterized in that the pressure piece adjoining the gas injector (9) of the outlet elbow (6) forms a mouthpiece channel which is formed on the one hand by the sliding guide and on the other hand by an opposite flow wall (25) . 13. Device according to one of claims 1 to 12, characterized in that the flow wall (25) has substantially the same curvature as the sliding guide (15). 14. Device according to one of claims 1 to 13, characterized in that an air slot (26) is recessed in the flow wall (25). 15. Device according to one of claims 1 to 14, characterized in that the gas injector (9) is connected to a control circuit (27) which switches off the air supply to the gas injector (9) as soon as the beginning of the sliver has reached the pressure piece (15). 16. The device according to one of claims 1 to 15, characterized in that the outlet elbow (6), the gas injector (9) and the pressure piece (15) are arranged on a turntable (3), the arranged behind the pressure piece (15) Inclined surface (21) as part of the edge (23) of the turntable (3) and the turntable (3) with the edge (23) is fitted into the fixed wall (13). 17. The device according to one of claims 1 to 16, characterized in that on the pressure piece (15) engages on the turntable (3) supporting spring (19) and spring-loaded in the direction of the fixed wall (13). 18. Device according to one of claims 1 to 17, characterized in that the pressing piece about a fixed wall (13) parallel pivot axis (17) is pivotally mounted on the turntable (3), the pivot axis (17) from the pressing surface ( 20) of the pressure piece (15) is spaced. 19. Device according to one of claims 1 to 18, characterized in that the edge (23) of the turntable (3) is made of plastic.

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