CN108861865B

CN108861865B - Auxiliary device for assisting reel replacement in winding device

Info

Publication number: CN108861865B
Application number: CN201710341748.1A
Authority: CN
Inventors: 焦玉荣; 姜华; 王小兵
Original assignee: Oerlikon Textile GmbH and Co KG
Current assignee: Oerlikon Textile GmbH and Co KG
Priority date: 2017-05-16
Filing date: 2017-05-16
Publication date: 2021-07-09
Anticipated expiration: 2037-05-16
Also published as: CN108861865A; JP2018193250A; JP7030609B2

Abstract

The invention discloses an auxiliary device for assisting reel replacement in a winding device, which comprises a suction mechanism capable of rotating and moving, and a guide mechanism and a cutting mechanism which are respectively arranged on the suction mechanism, wherein the suction mechanism is provided with an open end for sucking a yarn end by using negative pressure, the guide mechanism is provided with a catching element which is matched with the open end to hold a section of yarn, the cutting mechanism is provided with a cutting element for cutting the yarn, the catching element, the open end and the cutting element are arranged side by side, and the open end is positioned between the catching element and the cutting element. According to the invention, the yarn suction, cutting and guiding can be carried out on a device with compact structure, and the inconvenience of maintenance and operation caused by the scattered distribution of the suction, cutting and guiding mechanisms can be avoided.

Description

Auxiliary device for assisting reel replacement in winding device

Technical Field

The invention relates to an auxiliary device for assisting the changing of a winding device drum in a textile machine.

Background

In the winding device, an auxiliary device for assisting the execution of the bobbin changing operation requires, without exception, a suction mechanism for sucking the yarn to perform a holding action and a cutting mechanism for cutting the yarn to make the full-wound bobbin an independent individual.

The auxiliary devices known in the prior art are roughly divided into two types. One is of the "rear type", i.e., the suction mechanism and the cutting mechanism are located on the rear side of the friction roller spaced from the yarn inlet side, as disclosed in patent No. CN 1094462C; the other is of the "front type", i.e. the suction means and the cutting means are located on the same side of the front side as the yarn inlet side, as disclosed in patent publication EP0659674B 1. The disadvantage of the "rear type" over the "front type" is that it is more difficult to access during maintenance, since it is far from the working channel.

As disclosed in EP0659674B1, the completion of the reel change operation requires a suction mechanism, a thread guide mechanism and a cutting mechanism, each located in front of a friction roller. The cutting mechanism is located near one end of the chuck of the winding device. The suction mechanism is located away from the friction roller. The guide wire mechanism is rotatably arranged, and the rotating shaft of the guide wire mechanism is positioned close to the chuck at the other end of the winding device. The thread guide mechanism comprises a long rod, one end of the long rod is connected with the rotating shaft, and the other end of the long rod is provided with a thread guide. Under the rotation action of the rotating shaft, the long rod can rotate between a position vertical to the winding pipe and a position parallel to the winding pipe to guide the yarn.

Since the suction mechanism, the wire guide mechanism, and the cutting mechanism are arranged in a dispersed form, maintenance is required to be performed separately at the time of maintenance. Meanwhile, the complex distributed structure will lead to the complicated operation of earlier stage installation and later stage disassembly.

Disclosure of Invention

Based on the aforementioned drawbacks of the prior art, the problem addressed by the present invention is to provide an auxiliary device for assisting the reel change of a winding device that avoids the aforementioned drawbacks. The purpose can be realized by the following technical scheme:

according to a first aspect of the present invention, an auxiliary device for assisting reel replacement in a winding device includes a suction mechanism that is rotatably movable, and a guide mechanism and a cutting mechanism that are respectively provided on the suction mechanism, the suction mechanism having an open end that sucks a yarn end with negative pressure, the guide mechanism having a catching member that cooperates with the open end to hold a piece of yarn, and the cutting mechanism having a cutting member for cutting yarn, the catching member, the open end, and the cutting member being provided side by side, the open end being located between the catching member and the cutting member.

The technical proposal ensures that the suction, the cutting and the guiding of the yarn are carried out on a device with compact structure, and avoids the inconvenience of maintenance and operation caused by the scattered distribution of the suction, the cutting and the guiding mechanisms. The presence of the open end of the suction tube between the cutting element and the catching element ensures that the yarn, after being cut, is effectively sucked by the suction tube and is held together by the suction tube and the catching element.

According to a second aspect of the invention, the open end of the suction mechanism has a groove extending through a cross-section of the open end in the direction of the cutting element and the catching element.

The distance of the yarn from the open end determines the success rate of the yarn end being sucked by the suction tube after being cut by the cutting element. Through the arrangement of the groove, the yarn can be tightly attached to the groove before being cut by the cutting element, so that the success rate of the yarn end being sucked can be remarkably improved.

According to a third aspect of the invention, the suction mechanism comprises a curved suction tube, wherein the suction tube has a vertical section and a transverse section with the open end, wherein the suction mechanism rotates with the vertical section as a rotation axis.

The suction pipe rotates by taking the vertical section of the suction pipe as a rotating shaft, so that the cutting mechanism and the guide mechanism rotate together. Therefore, an additional rotation shaft is not required and the structure of the auxiliary device is simplified.

According to a fourth aspect of the present invention, the suction mechanism is driven to rotate by a stepping motor.

The angle of rotation required during the entire operation of the auxiliary device is approximately 180 degrees. The stepping motor has the advantage of being capable of rotating at any angle, so that the auxiliary device can flexibly rotate at a certain angle to effectively process yarns under the driving of the stepping motor.

According to a fifth aspect of the present invention, the guide mechanism and the cutting mechanism are provided on the suction pipe near the open end.

By this, the auxiliary device of the invention can be obtained in a more compact structure.

According to a sixth aspect of the present invention, the cutting mechanism further includes a first raised portion provided on a side of the cutting element, and the catching member of the guide mechanism further has a second raised portion, wherein the first raised portion and the second raised portion protrude from an open end of the suction mechanism.

The first yarn rising portion is provided so that the yarn can be lifted up on the first yarn rising portion before being cut by the cutting member without being immediately cut, and therefore the yarn can be sufficiently brought into contact with the open end and the catching member before being cut. The second yarn rise enables the yarn to be lifted at the original level.

According to a seventh aspect of the present invention, the first yarn rising portion of the cutting mechanism is a guide wire plate, wherein an upper edge of the guide wire plate near the outside is higher than an upper edge of the cutting element near the outside, and the upper edge of the guide wire plate gradually falls in a direction from the inside to the outside, the upper edge of the guide wire plate near the inside is lower than the upper edge of the cutting element near the inside, and the upper edge of the cutting element gradually falls in a direction from the inside to the outside. By virtue of the above-mentioned relationship between the first thread rise and the cutting element, the thread can be lifted a distance above said first thread rise before being cut in contact with said cutting element, ensuring that the thread is sufficiently in contact with the open end.

According to an eighth aspect of the present invention, the catching member of the guiding mechanism is configured as a plate-shaped member arranged in a direction horizontal to the suction pipe, wherein the catching member includes an inner concave portion of the plate-shaped member for catching the yarn, and the second yarn rising portion is a guide wire slope surface located outside the inner concave portion and descending in an inside-to-outside direction.

The concave part and the rising part on the second yarn are arranged integrally to obtain a guide mechanism with a simpler structure.

According to a ninth aspect of the present invention, the guide mechanism and the cutting mechanism are fixed to a support portion in a spaced manner from the open end of the suction mechanism, wherein the support portion is connected to the suction mechanism.

Thus, the guide mechanism and the cutting mechanism are detachably provided.

According to a tenth aspect of the present invention, the cutting element comprises an upper cutter and a lower cutter arranged in a V-shape.

The crossing arrangement of the upper cutter and the lower cutter can form a cutting angle which is far larger than 180 degrees. Therefore, the success rate of yarn cutting can be increased.

According to an eleventh aspect of the present invention, the cutting member is located laterally rearward of the open end, and the catching member is located laterally forward of the open end.

When the auxiliary device is rotated from the initial position to the edge of the triangular area, the second yarn rising portion of the catching member may first come into contact with the yarn, then the open end comes into contact with the yarn, and the cutting member finally comes into contact with the yarn to be cut.

Drawings

Fig. 1 schematically shows a top view of a winding device with an auxiliary device according to the invention in an initial position;

fig. 2 schematically shows a partial front view of the aid;

fig. 2.1 schematically shows a side view of the severing mechanism of the aid;

fig. 2.2 schematically shows a side view of the guiding mechanism of the auxiliary device;

fig. 3 schematically shows a side view of the winding device with the auxiliary device according to the invention in an initial position;

FIG. 4 schematically illustrates a side view of the present invention before the yarn is cut by the cutting mechanism;

FIG. 5 schematically illustrates a side view of the present invention after the yarn has been cut by the cutting mechanism, with the yarn being held by the open end and the catch member;

FIG. 6 schematically shows a partial schematic view of the chuck part and the auxiliary device of the present invention when the auxiliary device is rotated to the chuck position;

figure 7 is a schematic partial view of the chuck part and the auxiliary device of the invention when the auxiliary device is counter-rotated away from the chuck as described in the market.

Detailed Description

The winding device is used in textile machinery to regularly wind yarns to form a drum with a specific shape such as a cylinder shape or a cone shape. In order to ensure the continuity of winding, there are currently fully automatic reel-changing devices which remove the completed reel from the winding device, and then load a new winding tube onto the winding device for a new winding round. During the reel change operation, it is necessary to cut, suck and hold the yarn by an auxiliary device and to deliver the held yarn to a new winding tube with the aid of this auxiliary device. The following will describe the auxiliary device of the present invention in detail, and it should be noted that: hereinafter, the "downstream side" and the "upstream side" are both referred to the advancing direction of the yarn; the "inner side" used in describing the guide mechanism and the cutting mechanism refers to a side which comes into contact with the yarn later when approaching the yarn, and the "outer side" refers to a side which comes into contact with the yarn earlier. For example, the inner recess is located inside with respect to the second yarn rise and the second yarn rise is located outside with respect to the inner recess, because the second yarn rise first comes into contact with the yarn when the guide mechanism approaches the yarn.

Fig. 1 shows schematically a top view of the invention with the auxiliary device of the winding device according to the invention in an initial position. Fig. 3 is a side view of the present invention with the auxiliary device in an initial position. Fig. 6 is a partial schematic view of the chuck part and the auxiliary device when the auxiliary device is rotated to the chuck position. The structure of the present invention will be described with reference to fig. 1, 3 and 6. As shown in fig. 1 and 3, the winding device includes a yarn inlet side 5, an auxiliary device 1, a traverse guide 4, a friction roller 3, and a cradle 2. The yarn inlet side 5 is the side of the yarn 6 entering the winding device. The cradle 2 is provided at one end with a pair of chucks 2.1 which can grip the convolute duct 7, while the other end has an axis of rotation 2.2. The cradle 2 is rotatable about the axis of rotation 2.2 so that the gripped winding tube 7 can be moved against or away from the friction roller 3. The reciprocating yarn guiding device 4 is provided with a yarn guide 4.1, a guide belt 4.2 and a driving motor 4.3. The drive motor 4.3 drives the guide belt 4.2 and moves the guide belt 4.2 in alternating directions by alternating the direction of rotation thereof. The thread guide 4.1 is fixed to the guide belt 4.2, so that the thread guide 4.1 can be moved with the guide belt 4.2 in alternating directions, i.e. axially back and forth along the winding tube 7. The contact between the friction roller 3 directly driven by a not-shown driving source and the take-up tube 7 causes the take-up tube 7 to rotate by virtue of the contact friction. The thread guide 4.1 is located upstream of the friction roller 3 and the auxiliary device 1 is located upstream of the thread guide 4.1. The thread guide 4.1 and the auxiliary device 1 are both located on one side, i.e. the downstream side, of the friction roller 3. In the normal winding process, the yarn 6 passes through the yarn inlet side 5, passes through the yarn guide 4.1, is guided by the yarn guide 4.1 to reciprocate along the axial direction of the winding pipe 7, enters the contact part of the winding pipe 7 and the friction roller 3, and is finally wound on the winding pipe 7 to form a winding drum 10.

As can be seen from the partial schematic view shown in fig. 6, a hook member 8 is fixed at the circumferential edge of the chuck 2.1 for hooking the yarn when the yarn is fed to the vicinity of the chuck 2.1 before the yarn winding starts, so that the yarn is wound around the winding tube. The back of the chuck 2.1 is provided with a cutter 9 for cutting the yarn which is hooked by the hook member 8 and then the hook member 8 is held together with the open end 11.3 of the suction tube 11.

As shown in fig. 1, the assist device 1 includes a suction mechanism 14, a guide mechanism 15, and a cutting mechanism 13.

As further shown in fig. 3, the suction device 14 is designed as a curved "L" -shaped suction tube 11, which is composed of a transverse section 11.1 and a vertical section 11.2. To achieve the suction of the yarn, one end of the vertical section 11.2 is connected to a source of negative pressure, not shown, and one end of the transverse section 11.1 is an open end 11.3 for sucking the yarn. When the source of underpressure communicates with the suction tube 11, the open end 11.3 of said suction tube 11 will create a suction effect. The yarn 6 can be held under tension at the open end 11.3 by the fact that the cut yarn end of the yarn 6 is held by the open end 11.3 when it is located near the open end 11.3. In order to rotate the suction device 14, the suction pipe 11 of the suction device 14 is connected to a drive. Preferably, the drive means employs a stepper motor 12. The transmission can be achieved by providing a gear on the vertical section 11.2 of the suction duct 11 and engaging with a gear on the output shaft of said stepper motor 12. Under the driving action of the stepping motor 12 and the transmission action of the gears, the suction pipe 11 can rotate by taking the vertical section 11.2 thereof as a rotating shaft.

Fig. 2 is a front view of the aid 1, fig. 2.2 is a side view of the guide means 15 of the aid 1, and the side profile of the guide means 15 is also shown in fig. 3. As shown in fig. 2, 2.2 and 3, for guiding the yarn 6, the guide means 15 comprise a catch element 16. The catching member 16 can cooperate with the open end 11.3 of the suction tube 11 to grip the yarn 6 sucked by the open end 11.3, by which the gripped yarn is fed to the vicinity of the chuck 2.1 of the winding device at an angle that can be easily hooked by the hook member 8. Preferably, the catch element 16 is provided as a plate-shaped element, which is arranged in a direction substantially in the same direction as the opening direction of the open end 11.3. The plate has an internal recess 16.1 which is concave inwards, so that the internal recess 16.1 can accommodate the yarn 6 transversely therethrough, as shown in fig. 2.2.

Fig. 2.1 is a side view of the cutting mechanism 13 of the auxiliary device 1. As shown in fig. 2.1, the severing mechanism 13 comprises a severing element 17 for severing the thread 6. The cutting element is preferably a knife with a blade. The blade is positioned to face the yarn during shredding, i.e. the blade is oriented in a direction substantially coincident with the direction of opening of the open end 11.3. Preferably, said cutting element 17 comprises an upper knife 17.1 and a lower knife 17.2 arranged in a V-shape. The cutting edges of the upper cutter 17.1 and the lower cutter 17.2 are arranged in a crossed manner, so that a cutting angle which is far larger than 180 degrees can be formed. This arrangement thus increases the success rate with which the yarn is cut.

The cutting element 17 and the catching element 16 are arranged in a side-by-side manner on both sides of the open end 11.3 of the suction duct 11 and the three elements are arranged in a relatively compact configuration. As shown in fig. 2, the cutting element 17 is arranged on one side of the open end 11.3 closer to the open end 11.3, and the catching element 16 is also arranged on the other side of the open end 11.3 closer to the open end 11.3. One side and the other side here refer to the left and right sides of the open end 11.3. Both the cutting means 13 and the guide means 15 are arranged on the transverse section 11.1 of the suction tube 11 of the suction means 14, so that the cutting means 13 and the guide means 15 can rotate as the suction tube 11 rotates. Preferably, the cutting means 13 and the guide means 15 are provided on a support 18, which support 18 is connected to the transverse portion 11.1 of the suction tube 11. Of course, the cutting mechanism 13 and the guide mechanism 15 may be formed integrally. The one-piece construction may be attached to the suction tube 11 by welding or by conventional bolt and nut fastening.

As shown in fig. 2 and 2.1, the cutting mechanism 13 further includes a first yarn raising portion 19. The first raised portion 19 is a guide plate member mounted in close contact with the cutting element 17. The mutual positional relationship of the raised portion 19 on the first yarn and the lower knife 17.2 of the cutting element 17 is: the upper edge 19.1 of the first on-yarn rising portion 19 near the outer side is higher than the upper edge 17.3 of the lower cutter 17.2 near the outer side, and the upper edge 19.1 of the first on-yarn rising portion 19 gradually falls in the direction from the inner side to the outer side, wherein the upper edge 19.1 of the first on-yarn rising portion 19 near the inner side is lower than the upper edge 17.3 of the lower cutter 17.2 near the inner side, and the upper edge 17.3 of the lower cutter 17.2 gradually falls in the direction from the inner side to the outer side. Therefore, when the cutting mechanism 13 approaches the yarn 6, the upper edge 19.1 of the raised portion 19 on the first yarn comes into contact with the yarn 6 first. The yarn then moves inwardly along the rising upper edge 19.1. After moving a certain distance, the yarn 6 comes into contact with the lower blade 17.2 of the cutting element 13 and is cut by the lower blade 17.2 of the cutting element 13.

As shown in fig. 2 and 3, the catching element 16 of the guide mechanism 15 has a second yarn rising section 16.2. The second yarn rise 16.2 is part of a plate-shaped element, which is a guide wire ramp arranged next to the inner recess 16.1 and outside the inner recess 16.1. The guide wire ramp is gradually descending in the medial to lateral direction. Therefore, the yarn 6 moves upward along the second yarn rising portion 16.2 before falling into the concave portion 16.1.

The orientation of the open end 11.3 is defined as "forward" and the direction opposite to the orientation of the open end 11.3 is "rearward". As shown in fig. 1, in order to achieve a better effect of sucking and cutting the thread, the catching element 16, the cutting element 17 and the open end 11.3 have a specific positional relationship: the cut-off element 17 is located laterally behind the open end 11.3 and the catch element 16 is located laterally in front of the open end 11.3. Based on this positional relationship, the second yarn rising portion 16.2 of the catching member 16 can first come into contact with the yarn 6 without the cutting member 17 first coming into contact with the yarn 6 when the auxiliary device 1 starts rotating from the initial position to come into contact with the yarn 6. The auxiliary device 1 continues to rotate until the yarn 6 comes into contact with both the open end 11.3 and the concave portion 16.1 of the catch element 16, before the yarn 6 comes into contact with the cutting element 17 and is cut. The angle of the connecting line between the open end 11.3, the cut-off element 17 and the recess 16.1, viewed in plan view, is therefore different from 90 degrees to the transverse section 11.1 of the suction tube 11.

The working steps of the auxiliary device 1 will be described in detail below with reference to fig. 1 and 3 to 7.

Fig. 1 and 3 are a top view and a side view of the auxiliary device 1 in an initial position, respectively. After being processed by the processing device on the upstream side, the yarn 6 passes through a lifting yarn guide 20, and enters the winding device. The lifting thread guide 20 can be raised and lowered between a lower position and an upper position by means of a cylinder 20.1. After passing the lifting thread guide 20, the thread 6 passes a traversing thread guide 4.1 and then enters the contact gap between the friction roller 3 and the drum 10. The guide wire 4.1 is kept in reciprocating motion in the axial direction of the winding tube 7 during operation. Therefore, the area covered by the motion track of the yarn between the lifting yarn guide 20 and the yarn guide 4.1 is a triangular area 6.1, as shown by the hatched area in fig. 1. In order to avoid disturbances of the yarn during normal operation, the auxiliary device 1 does not need to be operated outside the triangular region 6.1. Preferably, the transverse section 11.1 of the suction tube 11 is now in a position substantially perpendicular to the winding tube 7 and away from the winding drum 10. Meanwhile, when the yarn 6 is normally wound, the lifting yarn guide 20 is in a low position.

When the reel 10 reaches the predetermined parameter criteria (e.g., reel diameter, winding time), the reel 10 is completed and can be unloaded for replacement with a new winding tube. The cylinder for driving the lifting thread guide 20 receives a signal to lift the lifting thread guide 20 to a high position, as shown in fig. 4, in which the triangular area 6.1 is higher than in the lower position, so that the thread 6 is at the same height level as the auxiliary device 1. The stepping motor 12 for driving the assist device 1 receives a rotation signal to cause the stepping motor 12 to drive the assist device 1. At the same time, the suction tube 11 is connected to a negative pressure source. Under the drive of the stepping motor 12, the vertical section 11.2 of the suction pipe 11 rotates, and the transverse section 11.1 synchronously rotates and approaches to the triangular area 6.1. After rotating to the edge of the triangular area 6.1, the auxiliary device 1 comes into contact with the yarn 6. Due to the above-mentioned specific positional relationship between the catching member 16, the cutting member 17 and the open end 11.3, the yarn 6 first comes into contact with the second yarn rising portion 16.2 of the guide mechanism 15. During the continued rotation of the auxiliary device 1 in the original direction, the thread 6 continues to be lifted on the second thread rise 16.2 and finally falls into the recess 16.1. As the auxiliary device 1 continues to rotate, the yarn 6 then comes into contact with the open end 11.3 of the suction duct 11 of the auxiliary device 1, so that the yarn 6 can come into contact both with said open end 11.3 and with said internal recess 16.1, as shown in fig. 4. Then, the yarn 6 is then brought into contact with the first yarn rising portion 19 of the cutting mechanism 13, and with the rotation of the first yarn rising portion 19, the yarn 6 is lifted upward relative to the first yarn rising portion 19 until being brought into contact with the cutting element 17 to be cut. The yarn 6 is cut into two yarn ends, the yarn end connected to the spool 10 being brought onto the spool 10 by the rotating spool 10; the other end is sucked by the open end 11.3 of the working suction tube 11. A part of the yarn is thus held between the open end 11.3 and the inner recess 16.1, as shown in fig. 5.

After the winding of the reel 10 has been completed, the cradle 2 is rotated about the axis of rotation 2.2 by means of a cylinder, not shown, and the reel 10 is lifted and separated from said friction roller 3. After the full roll of the reel 10 has been removed from between the chucks 2.1, a new winding tube 7 is loaded between the two chucks 2.1. The cradle 2 rotates in reverse, bringing the new winding tube 7 into contact with the friction roller 3 to rotate. Likewise, the chuck 2.1 is also rotated again with the winding tube 7.

The auxiliary device 1, which holds a portion of the yarn through the open end 11.3 and the recess 16.2, continues to rotate in the original direction under the drive of the stepper motor 12. Until this part of the held yarn is located in the vicinity of the chuck 2.1, i.e. in the hand-over position, the auxiliary device 1 receives a stop rotation signal. When the auxiliary device 1 is in the interface position, as shown in fig. 6, the held portion of the yarn intersects the face where the chuck 2.1 is located. Hook elements 8, which are located on the circumference of the chuck 2.1 and project beyond the chuck 2.1, when rotated into contact with the thread 6, hook this portion of the held thread 6 and bring it into rotation to be wound on the winding tube 7. Shortly after the yarn 6 has been hooked by the hook element 8, the portion of the yarn held by the open end 11.3 of the suction tube 11 together with the hook element 8 is cut off in contact with the cutter 9 provided on the chuck 2.1, the end connected to the yarn on the winding tube 7 becoming the reel end, the other end being sucked away by the suction tube 11. At this time, the yarn 6 is continuously fed from the processing device on the upstream side, caught in the concave portion 16.1 of the catching member 16, and wound around the winding tube 7. Since the catching member 16 of the auxiliary device 1 is held stationary for a short time at the delivery position, the yarn 6 is repeatedly wound in superposition at one position at the end of the winding tube 7, forming a so-called tail 21.

Subsequently, the auxiliary device 1 receives a signal command to rotate the auxiliary device 1 in the direction opposite to the original rotation direction. During the reverse rotation, the yarn 6 hanging on the concave portion 16.1 of the catching element 16 can automatically leave the concave portion 16.1, fall on the plane with the same height as the reciprocating yarn guide 4.1, and be caught by the yarn guide 4.1 to reciprocate, as shown in fig. 7.

It should be noted that, before the auxiliary device 1 rotates reversely, the cylinder for driving the lifting yarn guide 20 receives a signal to drive the lifting yarn guide 20 to descend to the low position. This ensures that the auxiliary device 1 does not interfere with the normal running thread 6 during the reverse rotation.

Thereafter, the assist device 1 continues to rotate in the reverse direction until it returns to the initial position, waiting for the next task to be performed.

In order to increase the success rate of the yarn suction, the open end 11.3 of the suction device 14 has a groove 11.4 extending through the cross section of the open end 11.3 in the direction of the cutting element 17 and the catching element 16. In the above description of the working steps of the auxiliary device 1, after the drum 10 has reached the predetermined parameters, the yarn 6 is on the plane that can be processed by the auxiliary device 1 when the lifting yarn guide 20 is lifted, and the yarn 6 comes into contact when the auxiliary device 1 rotates to the triangular area 6.1. The yarn 6 comes into contact with the open end 11.3 of the suction duct 11 and with the internal recess 16.1 of the catching element 16 before being cut by the cutting element 17. The distance of the yarn 6 from the open end 11.3 at this time determines the success rate of the yarn end being sucked by the suction tube 11 after the yarn 6 has been cut by the cutting element 17. Thus, by providing the above-mentioned groove 11.4, the yarn 6 can be sufficiently in contact with the open end 11.3, that is, the yarn 6 can be sufficiently tightly attached to the open end 11.3. Said open end 11.3 can stably hold the yarn end when the yarn 6 is cut at the cutting element 17.

Claims

1. An auxiliary device for assisting reel replacement in a winding device, comprising a suction mechanism which is rotatably movable, and a guide mechanism and a cutting mechanism which are respectively provided on the suction mechanism, wherein the suction mechanism has an open end for sucking a yarn end with a negative pressure, the guide mechanism has a catching member which cooperates with the open end to hold a length of yarn, and the cutting mechanism has a cutting member for cutting the yarn,

the catch element, the open end and the cutting element are arranged side by side, wherein the open end is located between the catch element and the cutting element.

2. An accessory device as claimed in claim 1, characterised in that the open end of the suction mechanism has a recess extending across the cross-section of the open end in the direction of the cutting element and the catch element.

3. The accessory device of claim 1, wherein the suction mechanism comprises a curved suction tube, wherein the suction tube has a vertical section and a transverse section having the open end, wherein the suction mechanism rotates with the vertical section as an axis of rotation.

4. An accessory device as claimed in claim 3, in which the suction mechanism is driven to rotate by a stepper motor.

5. An accessory device as claimed in claim 3, in which the guide means and the cutting means are provided on the suction tube adjacent the open end.

6. The assisting apparatus of any one of claims 1 to 5, wherein the cutting mechanism further includes a first thread rising portion provided on a side of the cutting member, and the catching member of the guide mechanism further has a second thread rising portion, wherein the first thread rising portion and the second thread rising portion protrude from an open end of the suction mechanism.

7. The assist device according to claim 6, wherein the first yarn rising portion of the cutting mechanism is a guide wire plate, wherein an upper edge of the guide wire plate near the outer side is higher than an upper edge of the cutting member near the outer side, and the upper edge of the guide wire plate gradually falls in a direction from the inner side to the outer side, the upper edge of the guide wire plate near the inner side is lower than the upper edge of the cutting member near the inner side, and the upper edge of the cutting member gradually falls in a direction from the inner side to the outer side.

8. An accessory device as claimed in claim 6, characterized in that the catching member of the guide means is provided as a plate-shaped member arranged in a direction horizontal to the suction tube, wherein the catching member comprises an inner recess of the plate-shaped member for catching the yarn, and wherein the second yarn rise is a guide wire slope descending in an inner-to-outer direction outside the inner recess.

9. The supplemental device of claim 1, wherein said guide mechanism and said cutting mechanism are secured to a support in spaced relation to said open end of said suction mechanism, wherein said support is connected to said suction mechanism.

10. The supplemental device of claim 1, wherein the severing element comprises an upper cutter and a lower cutter arranged in a V-shape.

11. The accessory of claim 1, wherein the cut-off element is laterally rearward of the open end and the catch element is laterally forward of the open end.