Yarn collection device

Abstract

The invention relates to a thread collecting device having a movable thread guide comb for guiding a plurality of threads of a thread piece, a cutting device for cutting the threads of the thread piece and a suction device for suctioning the threads of the thread piece. Here, the thread guide comb has a plurality of thread guide slots arranged in a row in a thread movement plane, wherein the cutting device has an open catching opening in which a cutting tool is arranged and which is aligned towards the thread movement plane. In order to improve the cutting of threads, in particular with a relatively high thread count and a large number of filaments, according to the invention the cutting device, together with the catching opening and the cutting tool, is configured to be pivotable into the thread movement plane of the threads.

Description

Technical Field

[0001] The present invention relates to a thread collecting device having a guide comb for guiding the movement of multiple threads in a thread group, a cutting device for cutting the threads in the thread group, and a suction device for suctioning the threads in the thread group. Background Technology

[0002] This type of thread collecting device is disclosed in DE102017009994A1.

[0003] In the production of synthetic yarns, the synthetic yarns are continuously extruded from polymer melt through multiple spinning nozzles using a spinning device. Each yarn is formed from a number of the finest filaments, which are collected after cooling to form individual yarns. To obtain specific physical properties such as strength and elongation in the freshly extruded yarns, the melt-spun yarns are drawn through a guide roller system and wound into individual yarn bobbins at the end of the production process. Yarn collection devices are typically used in the transition zone between the melt-spinning device and the guide roller system to cut yarn sheets as needed, for example, in case of yarn breakage, and to guide the yarn sheets to a waste bin via a suction device. This ensures that the continuous extrusion of yarns in the melt-spinning device can be carried out without interruption. Such yarn collection devices are disclosed in DE102017009994A1.

[0004] In known thread collecting devices, the threads are guided parallel to each other in the thread movement plane by means of a guide comb. The spacing of the thread guide grooves on the guide comb is selected so that the thread sheets can be concentrated and guided through the guide disc system. For cutting the thread sheets by a cutting device, an additional guide hook is provided, which is movable parallel to the thread movement plane and guides the thread sheets to the cutting device. For this purpose, the cutting device has a collection opening in which an internal cutting tool is housed. A suction device with an air intake port is positioned above the cutting device, the air intake port opening above the cutting device. To avoid excessive deflection, the thread is released from the guide grooves of the guide comb before being collected by the guide hook. For this purpose, the guide comb is designed to pivot about a central axis.

[0005] To be cut, the threads are guided into the cutting device via guide hooks. However, individual threads do sometimes become entangled during collection, hindering cutting by the cutting device. Cutting problems caused by thread fraying are particularly unavoidable with threads of high linear density and many long strands. Summary of the Invention

[0006] Therefore, the object of the present invention is to improve this type of filament collecting device in such a way that it can even reliably cut and draw in filaments with high filament linearity and a large number of filaments.

[0007] According to the invention, this objective is achieved by pivoting the cutting device, together with the trapping opening and the cutting tool, into the plane of the thread's movement.

[0008] This invention has a particular advantage in that the distance between the cutting tool of the cutting device and the wire of the wire sheet is reduced to a minimum. In this respect, selective cutting of the wire is facilitated because the cutting device pivots into the plane of wire movement.

[0009] It has been shown that the cutting tool should be held at an angle of less than 90° relative to the plane of the thread movement to cut the thread. In this regard, it is preferable to implement the following improvement of the invention, in which the trapping opening, together with the cutting tool, can be pivoted from a vertical rest position to a cutting angle position. Positioning the cutting device in the vertical rest position also allows the distance between the thread and the cutting tool to be set to a minimum.

[0010] The following improvement of the invention is particularly advantageous in that the trapping opening, together with the cutting tool, is positioned spaced apart from the wire sheet, such that at least one of the wires of the wire sheet can be cut during the pivoting motion of the trapping opening and the cutting tool. In this way, the relative motion between the wire sheet and the cutting tool can already be used to cut the first wire of the wire sheet.

[0011] To ensure high cutting quality when cutting multifilament threads, the following improvement of the invention is particularly advantageous, wherein a pivot angle in the range of 30° to 60° is spanned between the resting position and the cutting position of the trap opening. This allows the cutting tool to reliably cut the threads that have been guided into the trap opening.

[0012] To ensure the reliable reception of the wire sheet through the collecting opening as the cutting device is pivoted into the wire movement plane, the present invention provides an improvement in which the collecting opening is V-shaped and formed on a plate-like support, the support being held on a pivot at the end opposite the collecting opening. This pivot is aligned laterally in the wire movement plane, allowing the plate-like support to receive the wire sheet via a simple pivoting motion using the V-shaped collecting opening.

[0013] In order to automatically hold the cutting device and the collection opening together in the resting position, the cutting device is preferably tensioned between the support and the mounting bracket of the V-shaped collection opening by a coiled torsion spring, so that the collection opening is held in the resting position by the spring tension of the coiled torsion spring.

[0014] In order for the cutting device to pivot inward, the actuator (so that the support can move on the pivot against the spring force of the coiled torsion spring) is mounted on the mounting bracket. In this regard, the final position of the support with the trap opening can be ensured by limiting the stroke of the actuator or by a stop on the mounting bracket.

[0015] The cutting tool placed inside the trapping opening is preferably formed by multiple cutting blades overlapping each other in a V-shape, with the cutting blades facing the open trapping opening.

[0016] To ensure that all the threads of the filament sheet are continuously and individually cut in the cutting position of the cutting device, the following improvement of the present invention is particularly advantageous: the guide comb can be reciprocated between the working position and the collection position within the plane of the thread movement by means of a linear drive device. In this way, the guide grooves disposed on the guide comb extend within the plane of the V-shaped collecting opening for the threads to be cut.

[0017] To enable the suction device to concentrate the filaments cut by both the pivoting motion of the cutting device and the movement of the guide comb, the suction device is further specified to have an air intake port laterally aligned with the plane of filament movement and having an air intake orifice at its end spaced apart from the plane of filament movement. Preferably, the air intake orifice is eccentrically positioned relative to the plane of filament movement and is minimally spaced from the cutting device.

[0018] The yarn collecting device according to the invention is particularly suitable for all melt spinning processes to ensure the transfer of yarn sheets between the melt spinning device and the guide disc system. Multifiber yarns with relatively high linear density and a large number of filaments can preferably be reliably cut during production. Attached Figure Description

[0019] The thread collecting device according to the present invention will be explained in more detail below by way of embodiments and with reference to the accompanying drawings, in which:

[0020] Figure 1 A schematic side view of a first embodiment of the thread collecting device according to the present invention is shown;

[0021] Figure 2 schematically shown Figure 1 Front view of an embodiment;

[0022] Figure 3 schematically shown Figure 1 Plan view of the embodiment; and

[0023] Figure 4.1 and Figure 4.2 Schematic illustration based on Figure 1 The embodiments are shown in side views under different operating conditions. Detailed Implementation

[0024] The first embodiment of the thread collecting device according to the present invention is in Figure 1 , Figure 2 and Figure 3 Multiple views are shown schematically in the middle. Figure 1 With side view and Figure 2 The previous view showed this embodiment, while Figure 3 The embodiment is illustrated schematically in a plan view. The following description applies to all drawings unless one drawing is explicitly mentioned.

[0025] An embodiment of the filament collecting device according to the present invention includes a suction device 14, a cutting device 4, and a filament guide comb 1, which are stacked vertically along the direction of the filament. The filament guide comb 1 has a plurality of filament guide grooves 2 on its longitudinal side, which are arranged side by side with uniform spacing.

[0026] As from Figure 3 As clearly seen in the diagram, the wire guide grooves 2 are U-shaped and arranged side-by-side. The ends of the wire guide grooves 2 form a wire movement plane 9, in which the wires 10 are guided parallel to each other. Figure 3 and Figure 2 In the diagram, the plane 9 for the movement of the filaments is marked by dotted lines. The filament guide groove 2 in the guide comb 1 is preferably formed by a ceramic insert.

[0027] As from Figure 1 and Figure 3 As clearly seen in the diagram, the guide comb 1 is mounted protrudingly on the mounting bracket 13. In this respect, the guide comb 1 on the mounting bracket 13 is connected to a linear drive device 3, which thereby enables the guide comb 1 to be guided in a reciprocating manner within the plane of the yarn movement. Figures 1 to 3 In the illustrated configuration, the guide comb 1 is positioned in the working position to guide a sheet of yarns consisting of a plurality of yarns 10 within the transfer area between the melt spinning device and the guide disc system. Here, the yarns extruded from the melt spinning device with a relatively large spacing between them must be collected at processing intervals. The processing interval between the yarns, determined by the yarn guide grooves 2, is in the range of 4 mm to 6 mm. The number of yarn guide grooves 2 in the guide comb 1 is exemplary in this embodiment. 10, 12, or 16 yarns can then be guided side by side parallel to each other by this guide comb 1.

[0028] The cutting device 4 is positioned above the guide comb 1 along the direction of the filament. The cutting device 4 has a plate-shaped support 7 with a V-shaped filament opening 5 at its free end. The end 7 of the support 7 opposite to the filament opening 5 is pivotally held on a pivot 8.

[0029] As from Figure 2 and 3As clearly seen in the diagram, the cutting tool 6 is positioned near the closed end of the wire opening 5. The cutting tool 6 is formed by multiple cutting blades 6.1 arranged in a V-shape and overlapping within the wire opening 5. For this purpose, the support 7 is formed by multiple interconnected plates 7.1 and 7.2. The cutting blades 6.1 are positioned between plates 7.1 and 7.2.

[0030] As from Figure 2 and Figure 3 As clearly seen in the illustration, pivot 8 is housed in mounting bracket 13. For visualization purposes, mounting bracket 13 is... Figure 1 It is not shown at all.

[0031] Beside the support 7, a coiled torsion spring 11 is provided in the extension of the pivot 8. The coiled torsion spring 11 has a vertical leg 11.1 and a horizontal leg 11.2. The vertical leg 11.1 is supported on one of the plates 7.2 of the support 7. The horizontally oriented leg 11.2 of the coiled torsion spring 11 is supported on the mounting bracket 13.

[0032] like Figure 1 As can be clearly seen in the diagram, the support 7, together with the wire opening 5, is thus held in a vertical resting position by the winding torsion spring 11.

[0033] An actuator 12 with an actuating plunger 12.1 is mounted on a mounting bracket 13. The free end of the actuating plunger 12.1 is supported on a support 7 above a pivot 8. By activating the actuator 12, the support 7, together with the wire opening 5, can be pivoted away from the resting position, thereby causing the wire opening 5 to drop sharply into the wire movement plane 9 of the wire 10. The function of the cutting device 4 will be explained in more detail below.

[0034] The suction device 14 is positioned above the cutting device 4 along the direction of the wire. In this embodiment, the suction device 14 is shown only via the suction port 15, which is typically connected to a suction injector. The suction port 15 has a suction orifice 16 at its free end, which extends parallel to the wire movement plane 9 and remains spaced apart from the wire 10. The suction port 15 is also fixed to the mounting bracket 13.

[0035] The following also refers to Figure 4.1 and Figure 4.2 To explain the basis Figure 1 The functionality of the embodiments. According to Figure 1 Implementation, for example Figure 4.1 and Figure 4.2 The figures show different working conditions. Figure 1 The diagram shows the condition during normal operation, where the yarn 10 of the yarn sheet is guided by the guide comb 1. Figure 4.1 This shows the cutting device 4 being pivoted from the resting position to the cutting position. Figure 4.2This shows the situation where the guide comb 1 leaves the working position and is guided into the collection position so that the filaments 10 of the filament sheet are cut and received through the suction port 15 of the suction device 14.

[0036] If it is desired to cut the thread 10 of the wire sheet, the actuator 12 is activated. The actuating plunger 12.1, pressing against the support 7, guides the support 7, along with the thread opening 5, toward the wire sheet. The thread 10, guided immediately beside the support 7, drops abruptly into the thread opening 5 and is partially cut by the cutting tool 6. The support 7 is guided into the cutting position by the actuator 12. In the cutting position of the support 7, the cutting tool 6 within the thread opening 5 has a cutting angle advantageous for cutting the thread. Figure 4.1 The pivot angle indicated by the letter α in the middle is as follows: Figure 4.1 The resting position and the cutting position of the support 7, indicated by the dashed line, are defined. Here, the angle α is in the range of 30° to 60° to obtain a favorable cutting angle between the wire 10 and the cutting blade 6.1, depending on the type of wire.

[0037] Once the cutting device 4 is in the cutting position, the linear drive device 3 of the guide comb 1 is activated. The guide comb 1 is guided from the working position toward the mounting bracket 13 and into the collection position. Here, the wire 10 guided in the wire guide groove 2 is continuously guided into the wire opening 5 and the cutting tool 6. This process occurs in... Figure 4.2 It is shown in the middle.

[0038] exist Figure 2 In the operating condition shown, all the threads 10 of the wire sheet have been cut and guided to the waste bin via the air intake port 16 of the air intake port 15. The actuator 12 is now deactivated, thereby winding the torsion spring 11 to guide the support 7 along with the wire opening 5 back to the resting position. The linear drive 3 is also actuated to guide the guide comb 1 back to its operating position.

[0039] Figures 1 to 3 The embodiment of the thread collecting device of the present invention shown is illustrative in terms of its structural design. Importantly, the thread opening, together with the cutting tool, can pivot into the thread movement plane.

Claims

1. A thread collecting device comprising a guide comb (1) for guiding multiple threads of a thread sheet, a cutting device (4) for cutting the threads of the thread sheet, and a suction device (14) for suctioning the threads of the thread sheet, wherein, The guide comb (1) has a plurality of thread guide grooves (2) arranged in a row in the thread movement plane (9), and wherein the cutting device (4) has an open trapping opening (5) in which a cutting tool (6) is placed and the trapping opening is aligned with the thread movement plane (9), characterized in that the cutting device (4) together with the trapping opening (5) and the cutting tool (6) is configured to pivot into the thread movement plane (9) of the thread, wherein the trapping opening (5) together with the cutting tool (6) is pivotable from a vertical resting position to a cutting angle position, and wherein the pivoting angle (α) in the range of 30° to 60° spans between the resting position and the cutting position of the trapping opening (5).

2. The thread collecting device according to claim 1, characterized in that, The trapping opening (5) together with the cutting tool (6) is positioned at a distance from the filament sheet, so that at least one of the filaments (10) in the filament sheet can be cut during the pivoting motion of the trapping opening (5) together with the cutting tool (6).

3. The thread collecting device according to claim 1 or 2, characterized in that, The trapping opening (5) is arranged in a V-shape on a plate-shaped support (7), which is held on a pivot (8) at the end opposite to the trapping opening (5).

4. The thread collecting device according to claim 3, characterized in that, The pivot (8), which is aligned transversely to the plane of the silk thread movement (9), is mounted on the mounting frame (13), thereby holding the trapping opening (5) in the resting position. The coiled torsion spring (11) is tensioned between the plate support (7) and the mounting frame (13).

5. The thread collecting device according to claim 4, characterized in that, in The mounting bracket (13) is provided with an actuator (12), and the plate support (7) can move on the pivot (8) by means of the actuator (12) to overcome the spring force of the coiled torsion spring (11).

6. The thread collecting device according to claim 1 or 2, characterized in that, The cutting tool (6) is formed by multiple overlapping cutting blades (6.1) in a V-shape.

7. The thread collecting device according to claim 1 or 2, characterized in that, The guide comb (1) is guided in a reciprocating manner between the working position and the collection position within the filament movement plane (9) by means of a linear drive device (4).

8. The thread collecting device according to claim 1 or 2, characterized in that, The suction device (14) has a suction port (15) which is aligned laterally with the thread moving plane (9) and has a suction opening (16) at its end spaced apart from the thread moving plane (9).

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