Extraction equipment

Abstract

The invention relates to a suction device for guiding a yarn group, in particular at the start of a melt-spinning process. The suction device comprises a protruding suction pipe, which has a suction opening at its free end for receiving the yarn group. The suction pipe is connected via the opposite end to an ejector device for generating a suction air flow. The suction pipe is assigned a freely rotatable godet, which is held in position close to the suction opening by a bracket. In order to achieve a substantially constant yarn group pull-in angle regardless of the yarn feed, the godet with the bracket is, according to the invention, pivotably held in front of the suction opening of the suction pipe via a pivot bearing.

Description

Technical Field

[0001] The present invention relates to a suck-off apparatus for guiding a wire set. Background Art

[0002] In the melt-spinning process for producing synthetic yarn, the yarn is taken up by a suction device at the beginning of the process. This device receives the continuously extruded filaments and deposits the yarn group onto process components such as godets and yarn guides and in the winding station during the process. Therefore, this suction device is designed to be mobile and can be guided by an operator or automated control mechanism. The suction device must generate sufficient tensile stress on the yarn group through the suction force for the respective feeding operation.

[0003] In order to achieve the desired pressure setting for the respective feeding operation on the extraction device, WO 2019 / 238481 A1 discloses an extraction device in which the yarn group is guided upstream of the extraction device inlet over the circumference of a freely rotatable godet. The rotational speed of the godet is detected to record the yarn speed, so that the desired pressure setting can be achieved on the extraction device in a yarn speed-dependent manner.

[0004] However, in order to record the yarn speed, it is necessary to position the godet rollers as precisely as possible in the yarn path between the suction outlet of the extraction system and the respective processing unit. However, different entry angles of the yarn groups between the godet rollers and the suction outlet of the extraction system are unavoidable. These, however, distort the yarn speed determined from the godet roller rotational speed. Summary of the Invention

[0005] The object of the present invention is therefore to improve a suction device of this type for guiding a thread package in such a way that the thread package can be guided into the suction opening of the suction device at a defined entry angle independently of the positioning of the godet rollers.

[0006] According to the invention, this object is achieved by the fact that the godet with the bracket is held pivotably in front of the suction opening of the suction pipe by a pivot bearing.

[0007] The invention has the particular advantage that the thread group can be drawn in by the extraction device at a predetermined drawing-in angle, independently of the positioning of the godet rollers. To this end, the godet rollers are pivotally held in front of the suction opening of the extraction device. This allows the godet rollers to adapt to the respective thread path of the thread group. It is no longer necessary to orient the extraction device with the suction opening according to the thread path. Due to the pivotable godet rollers, the thread is always fed in at the optimal angle relative to the suction opening of the extraction device, independently of the thread group's entry. The movement complexity of the extraction device is thus significantly reduced.

[0008] In order to achieve a suitable entry angle of the yarn group into the suction opening of the suction pipe of the extraction device, the following modification of the invention is preferably designed, wherein the bracket is fastened to a support at the end opposite the godet, and the support is rotatably supported on the circumference of the suction pipe by a pivot bearing. In this way, the suction pipe forms the pivot axis for the godet.

[0009] Furthermore, in order to facilitate the feeding of the thread group to the godet, it is provided that the pivot bearing is held on the circumference of the suction pipe by means of a support sleeve, and that the support sleeve can be displaced on the circumference of the suction pipe by means of an actuator.

[0010] To maintain the predetermined end position of the godet relative to the suction opening of the suction pipe, the following refinement of the invention is particularly advantageous: the support sleeve is guided on a sliding sleeve that is fastened to the circumference of the suction pipe and has an end stop at each end. This allows the godet to be guided back and forth between the operating position and the system position.

[0011] In this case, the adjustment of the support sleeve on the circumference of the intake pipe advantageously takes place via an actuator which is held on the housing of the injector device.

[0012] In order to align the godet in the direction of yarn travel solely by yarn tension, the following refinement of the invention is particularly advantageous: a counterweight is arranged on the support, offset by 180° relative to the godet carrier. This way, the godet is held in a position in which it is oriented relative to the yarn run by the pivoting mounting of the counterweight on the support.

[0013] For mounting the godet, the following refinement of the invention has proven itself: the godet is fixedly connected in a co-rotating manner to a shaft end (shaft butt) oriented transversely to the suction opening and rotatably mounted on a carrier. This allows for higher rotational speeds and, therefore, higher thread travel speeds.

[0014] The shaft end is preferably rotatably mounted in the bearing sleeve, and the bearing sleeve is retained in the retaining hole of the carriage by a rubber member. Like this, the transmission of the tension fluctuation in the silk thread group can be advantageously absorbed.

[0015] In order to record the yarn speed, a rotational speed sensor is mounted on the carrier, by means of which the rotational speed of the godet roller can be detected.

[0016] The thread guiding on the godet roller peripheral surface is preferably at least generated by the introduction bevel on one side. In principle, the thread moving track can also be configured on the godet roller peripheral surface by the circumferential groove having the introduction bevel on both sides.

[0017] The extraction device of the present invention is therefore particularly suitable for guidance by an automated operator that performs automated thread guidance at the start of a melt-spinning process. The extraction device of the present invention also substantially facilitates manual guidance by an operator. In particular, the constant angle at which the thread group is drawn into the suction opening of the suction pipe by the godet rollers simplifies the holding and orientation of the extraction device relative to the axial direction of the thread group. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In the following, the present invention will be explained in more detail based on some embodiments of the extraction device for guiding a wire group according to the present invention with reference to the accompanying drawings, in which:

[0019] Figure 1 A view schematically showing a first embodiment of an extraction device according to the invention; and

[0020] Figure 2 A partial cross-sectional view schematically shows another embodiment of an extraction device according to the invention. DETAILED DESCRIPTION

[0021] Figure 1 A side view of a first embodiment of an extraction device for guiding a thread group according to the invention is schematically shown. This embodiment of the extraction device comprises an ejector device 1 having at least one control valve (not shown here) and control electronics (not shown here). The ejector device 1 is connected on one side to a compressed air line 5 and a waste line 6. On the opposite side of the ejector device 1, a suction pipe 3 is arranged in a protruding manner and is connected to the ejector device 1. A suction opening 4 for receiving one or more threads is provided at the free end of the suction pipe 3.

[0022] The wire guide roller 7 is arranged in close proximity in front of the suction port 4 of the suction pipe 3. The wire guide roller 7 is rotatably held on the bracket 8 by means of a shaft 9. The shaft 9 is arranged transversely with respect to the suction port 4 of the suction pipe 3, so that tangential wire guidance between the wire guide roller and the suction port 4 is possible. The bracket 8 extends parallel to the suction pipe 3 at one opposite end and is fixedly connected to the support 13. For this purpose, the support 13 has a retaining section 13.1 and a hollow cylindrical support section 13.2. The hollow cylindrical support section 13.2 is rotatably held on the circumference of the suction pipe 3 by means of a pivot support 14. The pivot support 14 is arranged on the circumference of the bracket sleeve 11, and the bracket sleeve 11 is movably configured on the suction pipe 3.

[0023] An actuator 12 connected to a support sleeve 11 on the circumference of the suction pipe 3 is held on the housing 2 of the ejector device 1. The support sleeve 11, together with the pivot support 14 and the support 13, can be displaced along the suction pipe 3 by the actuator 12. In this way, the godet 7 can be guided into various positions in front of the suction pipe 3.

[0024] The counterweight 15 is arranged on the support section 13.2 of the support 13 in a manner opposite to the holding section 13.1 of the support 13. The counterweight 15 is arranged on the support 13 in a manner offset by 180° relative to the godet 7.

[0025] A rotational speed sensor 10 is assigned to the godet 7 , which registers the rotational speed of the godet 7 and transmits it to the control electronics of the ejector device 1 .

[0026] During operation, the extraction device is guided by an automatic operating mechanism or an operator so that the yarn group is placed on a processing component such as a yarn guide, yarn guide, preparation device, etc. at the beginning of the melt-spinning process. Here, the yarn entry varies in a manner dependent on the respective feeding operation, with the result that the yarn is moved in from above, from below or from the side of the extraction device. For this reason, it is no longer necessary for the extraction device to be oriented in the direction of yarn movement with the suction pipe 3 and the suction opening 4. The yarn group is guided before the entrance of the suction opening 4 by the yarn roller 7. The yarn roller 7 is pivotally held on the support 13 by a pivot support 14, so that the orientation of the yarn direction occurs only through the yarn roller 7. In order that the yarn roller 7 can be constantly oriented in the direction of yarn tension, the counterweight 15 is arranged to be relatively located on the support 13. Pulling the yarn group into the suction opening 4 of the suction pipe 3 occurs at a constant entrance angle between the yarn roller 7 and the suction opening 4, regardless of the respective positions of the yarn rollers. For this reason, Figure 1 This thread group is shown and designated by the reference numeral 16 .

[0027] Since the feeding operation during the melt spinning process requires different yarn tensions in the yarn group 16, a pressure setting in the ejector device 1 is necessary. To this end, the rotational speed of the godet 7 is continuously determined by a rotational speed sensor 10, so that the yarn speed can be established in a manner that is derived therefrom. To draw in the yarn group 16 at a higher or lower yarn speed, the pressure setting in the ejector device 1 is varied, for example, by a control program. Higher yarn withdrawal speeds can thus also be achieved with higher pressures.

[0028] According to an embodiment of the extraction device of the present invention ( Figure 1 The structural design of (shown) is exemplary. The installation of the godet roller and the installation of the support on the suction pipe 3 can basically have alternative forms and designs. Figure 2 Another example is schematically shown.

[0029] Figure 2A schematic cross-sectional view of a front section of another embodiment of an extraction device according to the present invention is shown. This cross-sectional view shows the protruding end of the suction pipe 3 with the suction opening 4. A sliding sleeve 24 is fastened to the circumference of the suction pipe 3. At each end, the sliding sleeve 24 has an end stop 24.1 and 24.2, respectively. The support sleeve 11 is movably guided on the circumference of the sliding sleeve 24. The end of the support sleeve 11 opposite the suction opening 4 is connected to the actuator 12. A bearing sleeve 25 is arranged on the circumference of the support sleeve 11. The bearing sleeve 25 supports a pivot support 14 on which a hollow cylindrical support 13 is rotatably mounted. The hollow cylindrical support 13 extends substantially parallel to the suction pipe 3 and surrounds it. Here, the pivot support 14 is arranged at one end of the support 13. At the opposite end, the support 13 is connected to the bracket 8. In this embodiment, the bracket 8 and the support 13 are designed as a single piece. The bracket 8 has a retaining hole 20 at its free end. The bearing sleeve 18 is elastically retained in the retaining hole 20 by a plurality of rubber elements 19. The shaft end 17 is rotatably mounted in the bearing sleeve 18 via a plurality of rolling elements 26. The godet 7 is fastened to the end of the shaft end 17 that protrudes from the bearing sleeve 18 and the retaining hole 20. The speed sensor 10 is assigned to the shoulder 17.1 of the shaft end 17 at the opposite end of the shaft end 17 within the retaining hole 20.

[0030] The godet 7 has a thread guide 22 on its circumference. The thread guide 22 is delimited at one end of the godet 7 by an inlet bevel 23.1. The thread guide 22 of the godet 7 extends essentially perpendicularly to the suction opening 4 of the suction pipe 3. This allows the thread, which leaves the thread guide 22 and enters the suction opening 4 of the suction pipe 3, to enter almost tangentially.

[0031] However, as an alternative, the wire moving track 22 can also be defined on both ends of the circumference of the godet roller 7 by the introduction bevels 23.1 and 23.2. In this case, the wire moving track 22 forms a wire moving groove on the circumference of the godet roller 7. Figure 2 The introduction bevels 23.1 and 23.2 are shown in dashed lines.

[0032] According to an embodiment of the extraction device of the present invention ( Figure 2 ) is identical to the previous embodiment with respect to the function of its guide wire group. Therefore, no further explanation is given here, but reference is made to the above description.

Claims

1. A suction device for guiding a group of threads, the suction device comprising a protruding suction pipe (3), the suction pipe (3) having a suction opening (4) for receiving the group of threads at a free end and being connected to an ejector device (1) for generating a suction flow via an opposite end, and the suction device comprising a freely rotatable guide roller (7), the guide roller (7) being held in close proximity in front of the suction opening (4) of the suction pipe (3) by a bracket (8), Its characteristics are: The guide roller (7) together with the bracket (8) are pivotally held in front of the suction port (4) of the suction pipe (3) via a pivot support (14), wherein the bracket (8) is fastened to a support (13) via an end opposite to the guide roller (7), and the support (13) is freely rotatably held on the circumference of the suction pipe (3) via the pivot support (14), wherein a rotation speed sensor (10) is held on the bracket (8), and the rotation speed of the guide roller (7) can be detected by means of the rotation speed sensor (10).

2. The extraction equipment according to claim 1, characterized in that: The pivot support (14) is held on the circumferential surface of the intake pipe (3) by a bracket sleeve (11), and the bracket sleeve (11) can be displaced on the circumferential surface of the intake pipe (3) by an actuator (12).

3. The extraction equipment according to claim 2, characterized in that: The support sleeve (11) is guided on a sliding sleeve (24), which is fastened to the circumference of the intake pipe (3) and has an end stop (24.1, 24.2) at each end.

4. The extraction equipment according to claim 2, characterized in that: The actuator (12) is arranged on the housing (2) of the injector device (1).

5. The extraction device according to any one of claims 1 to 4, characterized in that: The counterweight (15) is arranged on the support (13) in a manner offset by 180° relative to the bracket (8) of the godet (7).

6. The extraction device according to any one of claims 1 to 4, characterized in that: The godet (7) is fixedly connected in a co-rotating manner to a shaft end (17), which is oriented transversely relative to the suction opening (4) and is rotatably mounted on the bracket (8).

7. The extraction equipment according to claim 6, characterized in that: The shaft end (17) is rotatably mounted in a bearing sleeve (18), and the bearing sleeve (18) is retained in a retaining hole (20) of the bracket (8) via a rubber member (19).

8. The extraction device according to any one of claims 1 to 4, characterized in that: The wire guide roller (7) has a wire moving rail (22) on its circumference. The wire moving rail (22) has an introduction bevel (23.1) on one side or a plurality of introduction bevels (23.1, 23.2) on both sides.

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