DEVICE FOR LAYING A THREAD

Description

[0001] The invention relates to a device for laying a thread according to the preamble of claim 1.

[0002] When producing synthetic yarns in a melt spinning process or when treating yarns in a texturing process, it is common for the yarns to be wound into a bobbin for storage at the end of the process. For this purpose, the yarn is guided back and forth within one bobbin width of the bobbin to be wound, resulting in a cross-winding to form the bobbin. A yarn guide is driven in an oscillating manner so that the yarn can be wound into a cylindrical or biconical cross-wound bobbin. To drive such a yarn guide, devices for laying a yarn are known in the prior art, in which the yarn guide is arranged at a guide end of a guide rod and in which the guide rod is driven in an oscillating manner. A device of this type for laying a yarn has long been known from DE 1 131 575 A1.

[0003] In the known device for laying a thread, the guide rod is rotatably mounted on a pivot axis. To drive the thread guide held at the guide end of the guide rod, a drive engages the opposite drive end of the guide rod. Since the drive end of the guide rod moves in a circular path relative to the pivot axis, the drive end is driven via a sliding connection with a multi-link gear, which is activated by a grooved disc for a uniform back and forth movement. Due to the shape of the circumferential groove in the grooved disc and its position, the guide end of the guide rod is moved back and forth, whereby a constant laying width prevails. Such mechanical coupling gears are therefore completely unsuitable for guiding a thread with the greatest possible variable laying width.

[0004] Therefore, to date, only devices in which the guide rod is held by its drive end on a driven shaft have become established for thread laying. Such systems are known, for example, from DE 199 60 024 A1 with an electric drive or from DE 15 60 360 A1 with a mechanical drive. However, all of these systems require that the kinetic energy of the guide rod be generated solely by a torque of the drive shaft. In this respect, the inertial forces of the guide rod act on the drive shaft, which requires correspondingly high braking and drive energies, particularly at the reversal points. In addition, precise angle detection and angle control are necessary to guide a thread with a variable laying width.

[0005] It is therefore an object of the invention to provide a generic device for laying a thread, in which the guide rod can be driven to an oscillating movement precisely and with easily adjustable laying widths.

[0006] This object is achieved according to the invention by a device for laying a thread according to claim 1, wherein the drive is designed as an oscillating linear drive and that the linear drive is connected to the drive end of the guide rod by a coupling member.

[0007] Advantageous further developments of the invention are defined by the features and combinations of features of the subclaims.

[0008] The invention has the particular advantage that the pivoting movement of the guide rod can be generated solely by a linear, straight-line movement. To transmit this movement to the drive end of the guide rod, which is guided on a circular path, a simple coupling element is provided between the linear drive and the guide rod, ensuring relative mobility between the guide rod and the linear drive. This allows the guide rod to be pivoted quickly and very precisely by the linear drive.

[0009] To transmit the relative movement between the linear drive and the drive end of the guide rod, which is guided along a circular guideway, the coupling element is formed by a push rod connected to the drive end of the guide rod by a swivel joint and to a plunger of the linear drive by a second swivel joint. This allows the linear movement of the linear drive to be transmitted directly to the drive end of the guide rod via the push rod.

[0010] To maintain a defined laying width for laying the thread, the linear drive is formed by a pneumatic, hydraulic, or electric actuator that moves the ram linearly back and forth within a stroke. The stroke of the linear drive thus determines the laying width at the leading end of the guide rod.

[0011] To achieve specific installation widths, the actuator stroke is preferably adjustable. This allows different coil widths or even biconical coils to be wound easily.

[0012] To achieve the most compact arrangement possible, the preferred embodiment of the invention is one in which the guide end of the guide rod is formed at the end of a guide leg and the drive end of the guide rod is formed at the end of a drive leg, with the pivot axis being arranged in the region between the guide leg and the drive leg, and with the guide leg and the drive leg spanning an angle between them in the range of 50° and 180°. Thus, L-shaped guide rods, in particular, can be used to convert the stroke movement of the linear drive into a pivoting movement of the guide end.

[0013] In order to be able to produce relatively large laying widths with the smallest possible stroke, the further development of the invention is provided in which the guide leg has a length which is many times greater than the length of the drive leg.

[0014] In this way, the lever laws can be used to create the largest possible laying widths with a relatively small stroke.

[0015] For the reproducibility and adjustability of the laying widths at the guide end, the further development of the invention is particularly advantageous, in which a laying width for laying the thread results from a calculation formula depending on the stroke of the linear drive and a length geometry of the guide rod as follows: V = L F / L A × H

[0016] Here, the laying width is designated by V, the length of the guide leg by LF, the length of the drive leg by LA and the stroke of the linear drive by H.

[0017] This allows the achieved thread laying width to be determined in advance for each adjustable stroke of the linear drive. This is particularly useful for executing stroke breathing and asymmetrical spools.

[0018] The device according to the invention for laying a thread is explained in more detail below using some embodiments with reference to the attached figures.

[0019] They represent: Fig. 1 schematically shows a view of a first embodiment of the device according to the invention for laying a thread. Fig. 2 schematically shows a view of a further embodiment of the device according to the invention for laying a thread. In the Fig. 1 A first embodiment of the device according to the invention for laying a thread is shown schematically. The embodiment has a guide rod 1, which is formed from a guide leg 1.1 and a drive leg 1.2. The guide rod 1 is rotatably mounted on a stationary pivot axis 4. The pivot axis 4 is arranged on the guide rod 1 in the area between the guide leg 1.1 and the drive leg 1.2. For this purpose, the guide rod 1 is L-shaped, so that an angle α is established between the guide leg 1.1 and the drive leg 1.2. The angle α can be in a range between 50° and a maximum of 180°. The guide leg 1.1 of the guide rod 1 has an effective length which is Fig. 1 is marked with the reference symbol LF. In contrast, the drive arm 1.2 has an effective length which is marked with the reference symbol LA in Fig. 1 is entered. The length LF of the guide leg 1.1 is several times greater than the length LA of the drive leg 1.2. The effective lengths LF and LA refer to a pivot axis 4 as the pivot point and a pivot point 8.1 on the drive leg 1.2 as well as a guide end 2.

[0020] The guide leg 1.1 has a thread guide 3 at its guide end 2. The drive leg 1.2 is connected to a drive 9 at a drive end 5. In this exemplary embodiment, the drive 9 is formed by a linear drive 6, which has an actuator 6.1 and a plunger 6.2. A coupling element in the form of a push rod 7 is arranged between the plunger 6.2 and the drive end 5 of the drive leg 1.2. For this purpose, the push rod 7 is connected to the drive end 5 of the drive leg 1.2 by a rotary joint 8.1. The push rod 7 is coupled to the plunger 6.2 of the linear drive 6 by a second rotary joint 8.2.

[0021] A control unit 10 is assigned to actuator 6.1. The control unit 10 can control the guide speed and stroke of actuator 6.1. For this purpose, actuator 6.1 can have pneumatic, hydraulic, or electrical means for moving plunger 6.2.

[0022] During operation, an oscillating drive movement is initiated at the drive end 5 of the drive leg 1.2 of the guide rod 1 via the linear drive 6. The drive leg 1.2 is thus moved back and forth with a rotation angle around the pivot axis 4. This rotational movement is transmitted to the guide leg 1.1. The pivot angle of the guide leg 1.1 and thus the laying width passing through the guide end 2 of the guide rod 1 in an oscillating manner, which corresponds, for example, to a coil width, is Fig. 1 in a dashed spool surface with the reference symbol V. In this embodiment, the spool is identified by the reference symbol 11. The laying width V, in which a thread is guided by the thread guide 3 at the guide end 2 of the guide rod 1, depends on the respectively set stroke of the linear drive 6. Here, in particular, the mean value and amplitude of the ram movement H(t) can be adjusted. This allows both a stroke breathing and a deposit position along the laying width V to be set. The stroke H thus forms the adjusting means for influencing and changing the laying width of the guide end 2. Due to the geometric relationships between the drive leg 1.2 and the guide leg 1.1, the laying width V can be predetermined using the stroke H of the linear drive 6. The following applies: V = L F / L A × H

[0023] In this respect, the laying width V can be determined for each stroke H using the lever geometries of the guide rod 1. The stroke on the linear drive 6 is adjusted by the control unit 10. The laying width can also be changed during the winding of a coil, for example, to achieve stroke breathing or a specific shape of the coil.

[0024] In the Fig. 1 In the illustrated embodiment, the linear drive 6 generates a vertically oscillating stroke movement to drive the guide rod 1. Alternatively, however, it is also possible for the linear drive 6 to perform a horizontal stroke movement. Fig. 2 An example of this is shown in the figure. The example in Fig. 2 is identical in structure to the embodiment according to Fig. 1 , so that at this point only the differences are explained and otherwise reference is made to the above description.

[0025] In the Fig. 2 In the illustrated embodiment, the guide rod has a guide leg 1.1 and a drive leg 1.2, which form an angle α of 180° between them. In this respect, the guide rod 1 is straight, with a pivot axis 4 arranged between the guide leg 1.1 and the drive leg 1.2.

[0026] The drive 9 is coupled to the drive end 5 of the drive leg 1.2. In this exemplary embodiment, the drive 9 also has a linear drive 6, which is formed from an actuator 6.1 and a plunger 6.2. The plunger 6.2 is connected to the drive end 5 of the guide rod 1 via a push rod 7. The push rod 7 is connected to the drive leg 1.2 via a rotary joint 8.1 and to the plunger 6.2 via a second rotary joint 8.2. The plunger 6.2 is moved back and forth horizontally within a stroke H by the actuator 6.1. For this purpose, the actuator 6.1 is controlled by the control unit 10. The push rod 7 forms the coupling element to enable a relative movement between the plunger 6.2 on a linear path and the drive end 5 on a circular path. The swivel joints 8.1 and 8.2 ensure a firm connection between the linear drive 6 and the guide rod 1 in every position.

[0027] In the embodiment in Fig. 1 and 2 The device for laying a thread is shown, as it can be used, for example, in a winding station for winding a thread. However, it is also possible for the linear drive to be assigned multiple guide rods 1 in order to wind several threads simultaneously into spools. In this respect, the plunger 6.2 of the actuator 6.1 could be connected to several guide rods via several coupling links.

Claims

1. Device for laying a thread, having a pivotable guide bar (1) which has a guide end (2) with a thread guide (3) and a drive end (5) and which is rotatably mounted on a stationary pivot axis (4), wherein the drive end (5) of the guide bar (1) is coupled to a drive (9), characterized in that the drive (9) is in the form of an oscillating linear drive (6), and in that the linear drive (6) is connected to the drive end (5) of the guide bar (1) by a coupling member (7) and the coupling member is formed by a push rod (7) which is connected to the drive end (5) of the guide bar (1) by a rotary joint (8.1) and to a plunger (6.2) of the linear drive (6) by a second rotary joint (8.2).

2. Device according to Claim 1, characterized in that the linear drive (6) is formed by a pneumatic or hydraulic or electric actuator (6.1) which guides the plunger (6.2) linearly back and forth within a stroke (H).

3. Device according to Claim 2, characterized in that the stroke (H) of the actuator (6.1) is configured to be adjustable in order to set a laying width (V) of the guide end (2).

4. Device according to one of Claims 1 to 3, characterized in that the guide end (2) of the guide bar (1) is formed at the end of a guide limb (1.1) and the drive end (5) of the guide bar (1) is formed at the end of a drive limb (1.2), in that the pivot axis (4) is arranged in the region between the guide limb (1.1) and the drive limb (1.2), and in that the guide limb (1.1) and the drive limb (1.2) span between them an angle (α) in the range from 50° to 180°.

5. Device according to Claim 4, characterized in that the guide limb (1.1) has an effective length (LF) which is several times greater than an effective length (LA) of the drive limb (1.2).

6. Device according to Claim 5, characterized in that a laying width (V) for the laying of the thread results from a calculation formula in dependence on the stroke (H) of the linear drive (6) and a length geometry of the guide bar (1) as follows: V = L F / L A × H