Yarn laying device of a yarn joint unit of a spinning machine producing cross-wound bobbins

Abstract

The invention relates to a yarn laying device for a spinning machine for producing cross-wound bobbins, comprising a gripper tube having gripper tube nozzles to which suction air can be applied, a gripper tube flap arranged on the gripper tube and a yarn laying hook arranged in the region of the gripper tube flap, the gripper tube flap being movable between an open position in which the gripper tube nozzles are opened and a closed position in which the gripper tube nozzles are closed. In order to provide a yarn laying device in which the possibility of yarn winding on the gripper tube or the gripper tube flap is significantly reduced compared to the yarn laying devices known from the prior art, it is provided that the yarn laying hook is arranged such that it protrudes beyond the outer surface of the gripper tube flap in the closed position of the gripper tube flap and is arranged at least flush with the outer surface or set back relative to the outer surface in the open position of the gripper tube flap.

Description

Technical Field

[0001] This invention relates to a yarn laying device for a yarn splicing unit of a spinning machine for producing cross-wound bobbins, comprising: - A yarn clamping tube, the yarn clamping tube having a nozzle portion capable of being used to apply suction air. - A yarn clamp tube flap arranged on the yarn clamp tube, the yarn clamp tube flap being movable between an open position (opening the yarn clamp tube nozzle) and a closed position (closing the yarn clamp tube nozzle), and - Yarn laying hooks arranged in the area of ​​the yarn clamp tube flap. Background Technology

[0002] In a spinning machine that produces cross-wound bobbins, the yarn is transferred from the feed bobbin to the cross-wound bobbin. Here, the feed bobbin may be, for example, a spinning tube produced on a ring spinning machine, whose yarn is wound onto the cross-wound bobbin to facilitate further processing.

[0003] In this type of spinning machine, an automatic yarn splicer and, possibly, an automatic bobbin changer are activated in the event of yarn breakage or when changing feed bobbins. First, the nozzle of the yarn splicing unit is positioned against a surface that picks up the bobbin, which rotates slowly in the opposite direction of winding. Once the upper yarn has been captured, the nozzle pivots to its initial position, in which the nozzle opening is located below the splicing device and inserts the upper yarn into the device.

[0004] Essentially simultaneously with the suction nozzle, the yarn clamp tube of the yarn laying device (which is also part of the yarn splicing unit) pivots from its initial position, first entering the lower pick-up position, where it picks up the lower yarn taken from the feed bobbin and holds it until it reaches the yarn tensioner or clamping device. During normal winding operations, the yarn clamp tube is positioned in the initial position. Then, the yarn clamp tube pivots to the upper transfer position, thereby carrying the lower yarn with it. When the yarn clamp tube pivots to its transfer position, the lower yarn is positioned in the splicing device.

[0005] To pick up the lower yarn, the yarn clamp tube has a flap at its end. When the yarn clamp tube pivots to the pick-up position, the flap moves to its open position via a switch door. In this pick-up position, negative pressure draws the lower yarn into the yarn clamp tube. Upon leaving the pick-up position, the flap closes again and clamps the yarn, allowing it to be securely transferred into the splicing device. When the yarn clamp tube pivots upwards to the transfer position, it uses a yarn-layout hook to cross the tension path of the upper yarn, picking it up and correctly positioning it in the splicing device. During the transfer position, the flap opens, allowing the upper and lower yarns to be inserted into the splicing device under tension.

[0006] During normal winding operations, the yarn clamp tube in its initial position is positioned at a distance from the normal yarn path. In this position, the clamp tube is spaced apart from the traveling yarn, so that, for example, after a yarn breakage, the falling yarn should not become entangled in the clamp tube or its flap, but rather fall over it. However, it has been shown that after a breakage or cut, the yarn often does not remain on its normal path, but can move uncontrollably due to the sudden reduction in yarn tension. Therefore, the distance to the normal yarn path does not provide sufficient protection against entanglement in the clamp tube or its flap. Downstream processing is adversely affected by this entanglement, meaning that the remaining yarn cannot be reliably picked up, and therefore, splices cannot be reliably established. In the worst case, entanglement causes the spinning machine to stop, necessitating manual intervention by the operator to restart the machine. Summary of the Invention

[0007] Based on this, the object of the present invention is to provide a yarn laying device in which the possibility of yarn getting tangled in the yarn clamp tube or the flip plate of the yarn clamp tube is significantly reduced compared with yarn laying devices known in the prior art.

[0008] This invention achieves this objective by means of a yarn laying device having the features of claim 1, and advantageous improvements of the invention are described in the dependent claims.

[0009] The yarn laying device for a yarn splicing unit according to the present invention comprises: a yarn clamp tube having a yarn clamp nozzle to which air is applied; a yarn clamp tube flap movably disposed between an open position of the open yarn clamp nozzle and a closed position of the closed yarn clamp nozzle; and a yarn laying hook disposed in the area of ​​the yarn clamp tube flap. As part of the yarn splicing unit, the yarn laying device functions in the manner described above to lay a lower yarn from a position disposed below the splicing device to engage with an upper yarn in the splicing device, wherein, during the positioning of the lower yarn in the splicing device, the yarn laying hook traverses the tension path of the upper yarn disposed in the splicing device by pivoting the yarn clamp tube, and positions the yarn in the splicing device in a functionally correct manner.

[0010] The yarn laying device according to the invention is characterized in that the yarn laying hook is configured such that, in the closed position of the yarn clamp tube flap, the yarn laying hook protrudes beyond the outer surface of the yarn clamp tube flap, and in the open position of the yarn clamp tube flap, it is configured to be at least flush with or retracted relative to the outer surface of the flap, such that the yarn laying hook then does not protrude beyond the outer surface of the yarn clamp tube flap.

[0011] In the closed position of the yarn clamp tube flap, the yarn laying hook protrudes beyond the outer surface of the yarn clamp tube flap, thus reliably ensuring that the upper yarn is reliably pressed into the splicing device via the yarn laying hook when the yarn clamp tube moves to the transition position where the yarn clamp tube flap is closed. However, at the same time, the yarn laying hook is at risk of becoming entangled in the yarn clamp tube flap, which may lead to malfunction of the spinning machine.

[0012] To prevent tangling, according to the invention, in the open position of the yarn clamp tube flap, the yarn laying hook is configured to be at least flush with or retracted relative to the outer surface. As a result, any tangling on the yarn clamp tube flap that might exist in the initial position of the yarn clamp tube due to the interaction between the lower yarn and the yarn laying hook is automatically eliminated. From the movement of the yarn clamp tube to the pickup position, in which the yarn clamp tube flap opens to receive the lower yarn in the yarn clamp tube nozzle, the yarn laying hook retracts relative to the outer surface until it is configured to be at least flush with or retracted relative to the outer surface, thereby disengaging the yarn laying hook from any tangling around the yarn clamp tube flap. The tangling can then easily slide off the yarn clamp tube flap, thus reliably avoiding problems caused by tangling.

[0013] As the yarn clamp tube subsequently moves to the transfer position, the yarn clamp tube flap closes as it leaves the lower pick-up position, thereby mechanically securing the lower yarn arranged in the nozzle of the yarn clamp tube at the flap. The yarn laying hook returns to its position protruding beyond the outer surface, thus reliably pressing the lower yarn into the splicing device in the area of ​​the transfer position.

[0014] Therefore, the yarn laying device according to the invention reliably avoids problems caused by entanglement around the yarn clamp tube in the area of ​​the yarn clamp tube flap, or existing entanglement caused by interaction with the yarn laying hook is automatically resolved, because when the yarn clamp tube flap is arranged in the open position, the entanglement can easily slide off the surface of the yarn clamp tube flap. At the same time, it ensures that the upper yarn is reliably positioned in the splicing device via the yarn laying hook.

[0015] According to another embodiment of the present invention, the yarn laying device includes a yarn guiding element arranged in the region of the yarn clamp tube flap such that the yarn guiding element protrudes beyond the outer surface of the yarn clamp tube flap in the closed position of the yarn clamp tube flap, and is configured to be at least flush with or retracted relative to the outer surface in the open position of the yarn clamp tube flap.

[0016] In some spinning machines equipped with circular bobbins, the yarn guide element is used to insert the lower yarn into the splicing device, in contrast to the case of "normal" yarn breakage, i.e., when changing bobbins. In the case of bobbin changes, an empty sleeve or bobbin is placed on a mandrel that cannot be further unwound without special preparation; the bobbin is transported away by a conveyor belt. The circular bobbin of the changing device then advances, allowing one of the spare bobbins to enter the conveying position of the circular bobbin and reach the mandrel pivoting at the pickup position through an opening in the bobbin base, a bobbin slide, and a centering flap. The mandrel then pivots back to the unwinding position along with a new feed bobbin. The yarn end of the feed bobbin, held in the center suction nozzle of the circular bobbin, forms the lower yarn strand, which is laid and held there in the direction of the yarn tensioner by an auxiliary yarn clamp.

[0017] During yarn bobbin replacement, the yarn clamp tube is in its initial position, which is set at a distance from the conventional yarn path. Once a new feed bobbin is installed, the yarn clamp tube pivots to an upper transfer position, where the yarn clamp tube nozzle draws a circular path. A yarn clamp tube flap, located in the area of ​​the yarn clamp tube nozzle, captures the lower yarn using its yarn guiding element and lays it along the direction of the splicing device. Since the circular path also traverses the yarn path, the upper yarn is also picked up by the yarn laying hooks arranged on the yarn clamp tube and similarly laid along the direction of the splicing device. In an improved yarn laying device with yarn laying hooks and yarn guiding elements, in the closed position of the yarn clamp tube flap, the yarn laying hooks typically protrude from the front side of the yarn clamp tube flap, while the yarn guiding elements protrude beyond the rear side of the outer surface.

[0018] This arrangement of the yarn guide element ensures that, in the open position of the yarn clamp tube flap, the yarn guide element is positioned at least flush with or retracted relative to the outer surface. This guarantees that, when using the yarn guide element, any entanglement that may form on the yarn guide element during the opening of the yarn clamp tube flap can automatically slide off the outer surface, as the entanglement disengages from the yarn guide element in the open position. In embodiments of the yarn laying device that also have a yarn guide element in addition to the yarn laying hook, problems caused by undesirable entanglement around the yarn clamp tube flap are thus reliably prevented, while simultaneously expanding the application range of the yarn laying device.

[0019] The arrangement of the yarn laying hooks and / or yarn guiding elements is essentially free to be chosen, such that they protrude beyond the outer surface of the yarn clamp tube flap in the closed position and are positioned at least flush with or retracted relative to it in the open position, thereby preventing or automatically eliminating tangling. However, according to another embodiment of the invention, the yarn clamp tube flap is configured to pivot between an open and closed position on a flap support connected to the yarn clamp tube, wherein the flap support is connected to the yarn laying hooks and / or yarn guiding elements such that they protrude through a slotted through-opening in the yarn clamp tube flap in the closed position and are retracted into the through-opening in the open position.

[0020] According to this embodiment of the invention, the yarn laying hook and / or yarn guiding element are connected to or integrated with the flip-plate bracket. In the closed position of the yarn clamp tube flip-plate, the yarn laying hook and / or yarn guiding element protrudes through a suitable groove-shaped through opening in the yarn clamp tube flip-plate, and protrudes beyond the outer surface of the yarn clamp tube flip-plate in the closed position. The yarn clamp tube flip-plate is pivotally connected to the flip-plate bracket, wherein, when the yarn clamp tube flip-plate moves from the closed position to the open position, the yarn laying hook and / or the yarn guiding element moves relative to each other in the groove-shaped through opening, the groove-shaped through opening extending in the pivoting direction of the yarn clamp tube flip-plate, such that in the open position, the yarn laying hook and / or the yarn guiding element are arranged in the groove-shaped through opening such that they no longer protrude beyond the outer surface of the yarn clamp tube flip-plate.

[0021] This embodiment of the invention ensures, in a particularly reliable manner, the flat outer surface of the yarn clamp tube flap in the open position, whereby the wrapped material can reliably slide off the yarn clamp tube flap. The use of a slotted through-hole particularly ensures that the outer surface is formed without any protrusions that would facilitate entanglement.

[0022] According to another embodiment of the invention, the yarn clamp tube flap has a guide section that abuts against the outer side of the flap support. According to this embodiment, the yarn clamp tube flap abuts against the side of the flap support opposite to the yarn clamp tube nozzle, thereby ensuring, in a particularly reliable manner, undisturbed pivoting movement of the yarn clamp tube flap between the open and closed positions. Therefore, jamming of the yarn clamp tube flap caused by tilting pivoting movement between the open and closed positions is particularly reliably prevented.

[0023] The yarn clamp tube flap closes the yarn clamp tube nozzle in the closed position and opens it in the open position, so that in the pick-up position, the lower yarn can subsequently be picked up by the suction flow applied to the yarn clamp tube nozzle. According to a particularly advantageous embodiment of the invention, the yarn clamp tube flap is provided with a closing element that closes the yarn clamp tube nozzle in the closed position, and this closing element is particularly preferably shaped to suit the yarn clamp tube nozzle; in particular, the closing element is formed as a plug concentrically arranged with the yarn clamp tube nozzle in the closed position. Using a correspondingly adapted closing element ensures in a particularly reliable manner that the yarn clamp tube nozzle is closed in the closed position of the yarn clamp tube flap, thereby interrupting the suction flow and simultaneously ensuring reliable mechanical clamping of the lower yarn disposed in the yarn clamp tube nozzle. Furthermore, in a corresponding improvement to the closing element, it can be particularly reliably ensured that the yarn clamp tube flap is closed under the action of a negative pressure present at the yarn clamp tube nozzle.

[0024] According to another embodiment of the invention, the yarn clamp tube flap has a control cam capable of engaging with a grooved control guide. According to this embodiment, the control cam reliably opens the yarn clamp tube flap in the regions of a pick-up position and an upper transfer position, wherein for this purpose, the control cam engages with a corresponding grooved guide arranged on the spinning machine, thereby cooperating with the grooved guide to cause a pivoting movement of the yarn clamp tube flap. Therefore, a separate opening device for moving the yarn clamp tube flap can be eliminated, wherein reliable movement of the yarn clamp tube flap between the open and closed positions in the pick-up position and in the transfer position can be ensured by the control cam and the correspondingly designed grooved guide.

[0025] To arrange the flap support on the yarn clamp tube, according to an advantageous embodiment, the flap support is provided with a clamping element for releasably securing the flap support to the yarn clamp tube. Using the clamping element, such as a clamping ring coaxially surrounding the yarn clamp tube in the region of the yarn clamp tube nozzle, makes it easy and reliable to install the yarn clamp tube flap, which is pivotally connected to the flap support, onto the yarn clamp tube. With the aid of the clamping element, the position of the yarn clamp tube flap can be aligned with the yarn clamp tube nozzle in a particularly precise manner. Furthermore, by using the clamping element, the yarn clamp tube flap can be easily replaced in case of damage.

[0026] To avoid destructive entanglement around the yarn clamp tube flap in a particularly problematic manner, a further development according to the invention specifies that the yarn clamp tube flap is configured with an outer surface having a planar and / or convex surface. According to this embodiment of the invention, the outer surface of the yarn clamp tube flap does not have recesses that promote entanglement. The planar and / or convex outer surface particularly facilitates good slippage of the entangled material. It is particularly advantageous to specify that the front and rear sides of the yarn clamp tube flap are connected to each other via arcuate portions of the outer surfaces, with the yarn laying hook protruding beyond the front side of the yarn clamp tube flap in the closed position, and an optional yarn guiding element protruding beyond the rear side of the yarn clamp tube flap in the closed position, wherein the inner angle between the front and rear sides of the yarn clamp tube flap has an angle >90°, thereby preventing entanglement in a particularly reliable manner. Attached Figure Description

[0027] Exemplary embodiments of the present invention will now be described with reference to the accompanying drawings. The drawings show: Figure 1 It is a first perspective view of a yarn laying device having a yarn clamp tube flap arranged in the closed position; Figure 2 yes Figure 1 A second perspective view of the yarn laying device; Figure 3 yes Figure 1 A third perspective view of the yarn laying device; Figure 4 It has a yarn clamp tube flap that is positioned in the open position. Figure 1 First perspective view of the yarn laying device; Figure 5 yes Figure 4 A second perspective view of the yarn laying device; Figure 6 yes Figure 4 A third perspective view of the yarn laying device; Figure 7 It is on the flip-board bracket Figure 1 First perspective view of the yarn clamp tube flap of the yarn laying device; Figure 8 yes Figure 1 A second perspective view of the yarn clamp tube flap of the yarn laying device; Figure 9 yes Figure 1 The third perspective view of the yarn clamp tube flap of the yarn laying device; Figure 10 It is set in Figure 1 A first perspective view of the flap support on the yarn clamp tube of the yarn laying device; and Figure 11 yes Figure 1A second perspective view of the flap support of the yarn laying device. Detailed Implementation

[0028] Figure 1 A perspective view of the yarn laying device 18 of a yarn splicing unit (not shown) for producing cross-wound bobbins is shown. The yarn laying unit 18 has an angled yarn clamp tube 1, which is pivotally connected to a suction air source on the spinning machine via a hollow yarn clamp tube shaft 7.

[0029] At the end opposite to the yarn clamp tube shaft 7, the yarn clamp tube 1 has a yarn clamp tube flap 2, which is mounted to facilitate the use of a flap bracket 5 connected to the yarn clamp tube 1. Figures 1 to 3 The closing position shown is the same as Figures 4 to 6 The device pivots between the open positions shown. In the closed position, the yarn clamp tube flap 2 closes the yarn clamp tube nozzle 8 of the yarn clamp tube 1, while in the open position, it opens the yarn clamp tube nozzle 8. To allow the yarn clamp tube flap 2 to be pivotally arranged in the area of ​​the yarn clamp tube nozzle 8, a bolt 6 is used. This bolt forms the pivot axis of the yarn clamp tube flap 2 and extends through the opposing bolt receptacles 10a, 10b of the yarn clamp tube flap 2, and is fixed to the flap bracket 5 in the bolt receptacle 9 (see [link]). Figures 7 to 9 ).

[0030] In order to position the flap 2 of the yarn clamp tube relative to the nozzle 8 of the yarn clamp tube on the yarn clamp tube 1, an annular clamping body 11 is used. This clamping body is connected to the flap bracket 5 by bolts 17 and coaxially surrounds the yarn clamp tube 1 in the assembled position.

[0031] exist Figures 1 to 3 In the closed position of the yarn clamp tube flap 2 shown in Figure 7, the yarn laying hook 3 and the yarn guiding element 4 protrude through the slotted through opening 13 in the yarn clamp tube flap 2, so that they protrude beyond the outer surface 19 of the yarn clamp tube flap 2. Here, the yarn laying hook 3 protrudes beyond the front side 21 of the yarn clamp tube flap 2, and the yarn guiding element 4 protrudes beyond the rear side 22 of the yarn clamp tube flap 2.

[0032] When the yarn clamp tube 1 pivots about the longitudinal axis of the yarn clamp tube shaft 7, in the areas of the lower pick-up position and the upper transfer position of the yarn clamp tube 1, the control cam 16 engages with the grooved control guide (not shown here) on the spinning machine and realizes the pivoting of the yarn clamp tube flap 2. Figures 4 to 6The diagram shows the open position, in which the yarn clamp nozzle 8 is open. When the yarn clamp tube flap 2 moves to the open position, the yarn laying hook 3 and the yarn guiding element 4 within the slotted through opening 13 are relatively displaced to a position where they are set back relative to the outer surface 19, i.e., they no longer protrude beyond the front side 21 or the rear side 22. Any entanglement that may be present against the yarn laying hook 3 and / or the yarn guiding element 4 slides off the outer surface 19 of the yarn clamp tube flap 2.

[0033] To close the yarn clamp nozzle 8 in the closed position of the yarn clamp tube flap 2, a closing element 12 matching the yarn clamp nozzle 8 is arranged on the inner side of the yarn clamp tube flap 2 on a closing element bracket 15. The closing element is concentrically arranged with the yarn clamp nozzle 8 in the closed position. The closing element 12 is held on the yarn clamp tube flap 2 by a screw (not shown), which can be screwed into the closing element bracket 15 and extends through a hole 14 on the front side 21 of the yarn clamp tube flap 2.

[0034] The yarn clamp tube flap 2 rests against the outer side 20 of the flap bracket 5 on its lower side, thereby ensuring reliable pivoting movement around the pivot axis formed by the bolt 6.

[0035] List of reference numerals 1 yarn clamp tube 2 yarn clamp tube flap 3. Yarn laying hook 4 yarn guiding elements 5-panel bracket 6 bolts 7. Yarn clamp tube shaft 8. Yarn clamp nozzle 9-pin housing (flip-top bracket) 10a, 10b Pin Receiving Section (Yarn Clamp Tube Flip Plate) 11 clamping main body 12 shut-off components 13 through openings 14 holes 15. Close the component bracket 16 control cams 17 screws 18 Yarn laying device 19 outer surface 20 outer 21 front side 22. Rear side.

Claims

1. A yarn laying device (18) for a yarn splicing unit of a spinning machine that produces cross-wound bobbins, comprising: - Yarn clamp tube (1), the yarn clamp tube having a nozzle (8) capable of being induced to draw air, - A yarn clamp tube flap (2) arranged on the yarn clamp tube (1), the yarn clamp tube flap being movable between an open position where the yarn clamp tube nozzle (8) is open and a closed position where the yarn clamp tube nozzle (8) is closed. - Yarn laying hooks (3) arranged in the area of ​​the yarn clamp tube flap (2), and - Yarn guiding elements (4) arranged in the area of ​​the yarn clamp tube flap (2), Its features are, The yarn laying hook (3) is configured such that, in the closed position of the yarn clamp tube flap (2), the yarn laying hook protrudes beyond the outer surface (19) of the yarn clamp tube flap (2), and in the open position of the yarn clamp tube flap (2), it is configured to be at least flush with the outer surface (19) or retracted relative to the outer surface. The yarn guiding element (4) is arranged such that when the yarn clamp tube flap (2) is closed, the yarn guiding element protrudes beyond the outer surface (19) of the yarn clamp tube flap (2), and when the yarn clamp tube flap (2) is open, it is set to be at least flush with the outer surface (19) or retracted relative to the outer surface.

2. The yarn laying device (18) according to claim 1, characterized in that, The yarn clamp tube flap (2) is configured to pivot between an open position and a closed position on a flap support (5) connected to the yarn clamp tube (1), wherein the flap support (5) is connected to the yarn laying hook (3) and / or the yarn guiding element (4) such that the flap support protrudes through a slotted through opening (13) in the yarn clamp tube flap (2) in the closed position and is arranged in the through opening (13) in the open position.

3. The yarn laying device (18) according to claim 2, characterized in that, The yarn clamp tube flap (2) has a guide section that abuts against the outer side (20) of the flap support (5).

4. The yarn laying device (18) according to any one of claims 1 to 3, characterized in that, The yarn clamp tube flap (2) has a closing element (12) that closes the yarn clamp tube nozzle (8) in the closed position.

5. The yarn laying device (18) according to claim 4, characterized in that, The closing element (12) has a shape suitable for the nozzle portion (8) of the yarn clamp.

6. The yarn laying device (18) according to claim 5, characterized in that, The closing element (12) is formed as a plug arranged concentrically with the nozzle portion (8) of the yarn clamp in the closed position.

7. The yarn laying apparatus (18) according to any one of claims 1 to 3, characterized in that, The yarn clamp tube flap (2) has a control cam (16) that can engage with a slotted control guide.

8. The yarn laying device (18) according to claim 2, characterized in that, The flip plate bracket (5) has a clamping body (11) for releasably fastening the flip plate bracket (5) to the yarn clamp tube (1).

9. The yarn laying apparatus (18) according to any one of claims 1 to 3, characterized in that, The yarn clamp tube flap (2) has a flat and / or convex outer surface.

Images