CN109837619B - Open-end spinning machine and method for repairing yarn in an open-end spinning machine - Google Patents
Open-end spinning machine and method for repairing yarn in an open-end spinning machine Download PDFInfo
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- CN109837619B CN109837619B CN201811416677.8A CN201811416677A CN109837619B CN 109837619 B CN109837619 B CN 109837619B CN 201811416677 A CN201811416677 A CN 201811416677A CN 109837619 B CN109837619 B CN 109837619B
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- 238000007383 open-end spinning Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000009987 spinning Methods 0.000 claims abstract description 127
- 230000008439 repair process Effects 0.000 claims abstract description 82
- 238000004804 winding Methods 0.000 claims abstract description 13
- 239000000835 fiber Substances 0.000 claims abstract description 11
- 238000002360 preparation method Methods 0.000 claims description 31
- 238000005520 cutting process Methods 0.000 claims description 30
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 13
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 6
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Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H4/00—Open-end spinning machines or arrangements for imparting twist to independently moving fibres separated from slivers; Piecing arrangements therefor; Covering endless core threads with fibres by open-end spinning techniques
- D01H4/48—Piecing arrangements; Control therefor
- D01H4/50—Piecing arrangements; Control therefor for rotor spinning
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Abstract
An open-end spinning machine and a method of repairing yarn in an open-end spinning machine, the open-end spinning machine comprising: at least one spinning head having a spinning unit that generates a yarn by introducing a fiber web into a spinning rotor and a winding unit that winds the yarn on a reel obtained from the spinning unit below onto a tube, at least one repair carriage being movable so as to be able to position itself in the vicinity of each spinning head and perform repair operations of the damaged yarn. Advantageously, the repair trolley comprises: a suction mouth unit shaped so as to perform all operations of gripping the yarn end and preparing the yarn end for subsequent repair; and an introduction group of yarns shaped to grip the yarn ends prepared in advance for repair and bring them onto the spinning rotor of the spinning unit in order to repair the yarn ends by the yarn being formed. The application reduces the number of devices that complete the cycle.
Description
Technical Field
The present application relates to an open-end spinning machine with an enhanced suction mouth unit and a related repair method in an open-end spinning machine.
Background
It is known that during spinning, yarn breaks may occur in the spinning machine, resulting in interruption of yarn production. This restoration of activity involves repairing (shaping) two parts of the yarn: the portion wound on the reel, which is generated before the breakage, and the portion to be generated when the spinning is to be resumed.
In open-end spinning machines, repair is performed by "triggering" the spinning using the yarn end picked up before breaking; in particular, the fibers of the new yarn will collect on the old end, thereby achieving the continuity of the yarn produced.
Typically, in the textile industry, the process of joining the ends of yarns is carried out by means of a repair cycle (or simple repair).
Generally, the known open-end spinning machines of interest to this patent are fully automated machines in which doffing and repair cycles are performed by a single trolley (trolley).
Inside this single trolley, some devices are used solely mainly/exclusively for doffing cycles, while others are used mainly/exclusively for repair cycles.
According to a possible known solution, among the various operations performed in the repair cycle described above, the pick-up, preparation and treatment of the yarn are carried out by means of the following machines:
1. a spool suction mouth;
2. a yarn centering unit;
3. a yarn preparation unit;
4. groups were introduced and extracted.
The suction mouth picks up the end of the yarn of the reel being formed. It comprises an optical sensor for checking the presence of yarn; typically, the device is driven by a stepper motor.
The yarn centering unit captures the yarn from the mouth and guides it to the preparation unit. The device is driven by a cylinder.
The yarn preparation unit pulls in the yarn, cuts the yarn and prepares the repaired end; furthermore, it is equipped with a device to ensure the gripping of the yarn by means of the rollers of the intake/extraction group. The group is actuated by means of a cylinder and by means of a low-pressure device.
Finally, the introduction and extraction group takes the yarn from the preparation unit, brings it near the output aperture of the spinning unit and introduces it to the length required to reach the rotor throat. These groups are driven by means of a stepper motor (rotation) and by means of a cylinder (lateral displacement).
Hereinafter, the repair cycle of the known solution will be described in more detail in order to better understand the technical problem that the present application aims to solve.
Thus, one should start from the moment when the reel has been stopped by the system and then lifted from the drag cylinder by means of the stop plate. The trolley is already in the vicinity of the "spinning head" where the repair will be performed. An opening device is arranged for opening the spinning unit.
At this time, the reel is lifted from the stopping plate by means of the reel lifting arm; the reel suction mouth intervenes, which is inclined from the rest position, down to the vicinity of the reel (distance about 5/6 mm). While inhalation is driven. The tip portion of the mouth has a suction cavity in the form of a low cut as wide as the width of the spool to allow the end to be picked up at an indefinite location on the spool.
The reel is rotated by means of counter-rollers to allow the yarn end to be identified and extracted from the reel. At the same time, a specific device on the same trolley handles the holes of the rubber yarn extraction roller.
The search for the end continues until the optical sensor of the mouth (yarn presence sensor) verifies its presence: if it is not detected, the search is repeated twice. If, despite various attempts, the end is not picked up, the system managing the machine sends out a warning by means of (lights/sounds), requesting operator intervention to solve the problem.
Once the yarn is picked up, the mouth moves back to the rest position. This back movement allows the yarn to be stretched, with the yarn centering unit tilted down to the working position, providing room for interference, leaving the yarn in place. By means of a special "V" shaped cavity, the centring unit intercepts the yarn and guides it in proximity to the yarn preparation unit. At which time the spool stops.
The mouth is pushed slightly forward to loosen the yarn, and the scissors of the centering unit cut the yarn picked up by the suction force by the yarn preparation unit. The cut yarn is pulled in and out as the spool suction mouth returns to its rest position.
The new end just manufactured is guided by a preparation device which wears it out by means of a jet of compressed air in preparation for the subsequent repair step. Once the yarn preparation is complete, the intake and extraction group is moved into position to pick up the yarn.
At the same time, specific devices on the same trolley clean the rotor, clean the hopper, shut down the spinning unit and prepare the web, eliminate damaged fibres. The spool lift arm then lowers the spool onto the stop plate.
The ready end picked up by the intake group first passes between the rollers of the extraction roller and then is introduced near the yarn delivery tube at the spinning unit and inserted into the tube so as to reach the rotor throat. The accuracy in positioning the yarn end in the rotor throat determines the quality of the repair.
The yarn end introduced into the throat of the rotor "triggers" the spinning so that the fibers processed by the rotor are gathered at the appropriately prepared end, thereby achieving continuity of the yarn produced. The actual patching is physically implemented.
At this point, the other devices on the same trolley resume yarn extraction by resuming the contact between the extraction roller and its motor shaft, and at the same time, the wire feed roller is activated again: and (5) restoring yarn production.
The rotation of the reel is then restarted by lowering the reel onto a drag cylinder (drag) by means of a stop plate: the pick-up is re-activated, the repair cycle is completed and normal rotation resumes. The trolley has completed the cycle and is free to leave.
As can be appreciated from the description, the operations performed by the machines of the background art are quite complex and also require relatively long waiting times.
Disclosure of Invention
The above known solutions therefore have drawbacks and limitations, mainly due to the fact that: they involve the use of complex and expensive mechanical systems to pick up the yarn end, center the yarn, prepare the yarn end for the following repair and insert/withdraw the yarn from the preparation unit to bring it near the output aperture of the spinning unit, which is necessary for the subsequent actual repair step.
In addition to increasing the complexity and cost of the machine, this known device also increases the time required to perform broken yarn repairs.
Accordingly, a need is felt to address the shortcomings and limitations mentioned with reference to the background art.
The application provides an open-end spinning machine comprising at least one spinning head having a spinning unit and a winding unit wound into a roll, the spinning unit producing yarn by introducing a fibre web into a spinning rotor, wherein the winding unit wound into a roll winds the yarn on a reel obtained from the spinning unit below onto a tube, -at least one repair trolley is movable so as to be able to position the repair trolley itself in the vicinity of each spinning head and perform repair operations of damaged yarn, wherein-the repair trolley comprises: a suction mouth unit shaped so as to perform all operations of gripping the yarn end and preparing the yarn end for subsequent repair; and an introduction group of yarns shaped to grip the yarn end prepared in advance for repair and bring the yarn end onto the spinning rotor of the spinning unit so as to repair the yarn end by the yarn being formed.
Further, the suction nozzle unit includes a suction nozzle, a yarn presence sensor located in the suction nozzle, a cutting device for cutting the yarn, and a preparation device for the yarn end.
Further, the suction mouth unit comprises a suction mouth from which the yarn is drawn, the suction mouth comprising a cavity therein defining a forced passage or channel for drawing the yarn.
Further, the suction mouth comprises an inlet portion which pulls in yarn and forms a straight cylindrical portion into which yarn is fed, the suction tube having an inner diameter.
Further, the suction mouth is provided with a flow diverter pneumatically interposed between the straight cylindrical portion and the suction duct, which diverts the axis of the straight cylindrical portion of the suction mouth, forcing the trajectory of the yarn sucked through the inside of the recess.
Further, the flow diverter is offset from the straight cylindrical portion of the air intake mouth by an offset of the axis in the flow diverter.
Further, the offset is related to the nominal inner diameter Dn according to: 1/2Dn < C <3/4Dn.
Further, the flow diverter has a double bend: a first bend between the axes of the straight cylindrical portions of the suction mouth upstream of the flow diverter; and a second bend between the flow diverter and the axis of the suction duct downstream of the flow diverter.
Further, the axes of the straight cylindrical portions of the suction mouth upstream of the suction ducts of the flow diverter are parallel to each other.
Further, the throat has a bottom for receiving the yarn, wherein the bottom has a variable aperture angle along its extension within the suction mouth relative to a plane perpendicular to its main extension axis.
Further, at the cutting device, the hole angle is between 80 ° and 100 °.
Further, at the end preparation device, the hole angle is between 75 ° and 95 °.
Further, the cross section of the passage of air in the straight cylindrical portion of the suction mouth decreases from the inlet portion to the end preparation device and from the end preparation device to the cutting device.
Further, the reduction of the passage area in the straight cylindrical portion of the suction mouth is between 2.7% and 3.2%.
Further, in the vicinity of the recess, the cutting means is positioned within the inhalation mouth.
Further, near the recess, an end preparation device of the yarn is positioned and configured to direct a jet of compressed air onto the end.
Further, the spinning machine comprises at least one doffing trolley positionable at each spinning head and equipped with a device for picking up the tube from the tube holder basket and moving it to a pair of tailstocks of the winding unit wound into a roll.
Further, the repair carriage and the doffing carriage pass at least partially through each other so as to overlap each other along a patrol path of the spinning head of the spinning machine.
The application also provides a method of repairing a yarn in an open-end spinning machine, the method comprising the steps of: step a: detecting yarn breakage by means of a yarn presence sensor mounted on the spinning head, step b: stopping the reel using a stopping plate driven by the spinning head, step c: simultaneously, the repair trolley is brought to the spinning head, the breakage of the yarn occurs at the spinning head, and the step d: rotating the reel by means of the repair trolley to start searching for the end of the broken yarn on the reel and at the same time bringing the suction mouth unit of the repair trolley in proximity of the reel to suck the end by actuating the suction means connected to the suction mouth, step e: stopping the reel after the yarn is picked up in the suction mouth, step f: actuating a cutting device housed in the mouth of the inhalation breath, moving the cutting member from the reel side, capturing the new end made by the cutting and preparing the new end with a jet of compressed air by means of an end preparation device housed in the mouth of the inhalation breath, step g: the yarn feeding unit of the repair carriage is actuated, and the yarn feeding unit grips the prepared yarn end and inserts the prepared yarn end into the spinning unit.
Further, simultaneously with step d, arrangement e and step f, the repair trolley cleans the spinning rotor and/or the hopper of the spinning rotor and then step g, lowers the reel onto the relevant stop plate.
Further, also simultaneously with step f and step g, the spinning head prepares the web, discards the damaged web and supplies new fibers to the spinning rotor using the web supply roller.
Further, during step g, the prepared end is picked up by the feeding unit, managed by a repair trolley which clamps the end between the feeding rollers of the feeding unit to bring the end to the spinning unit.
Further, the feed roller of the feed unit is assisted by the action of a counter roller which prevents the formation of undesired loops engageable with various mechanisms by rotating the reel in order to keep the suture taut and not slack.
Further, during step g, the yarn is inserted into a specific path by the feed unit and the end is introduced into the yarn output channel, wherein a release device is provided along the path, which maintains an extra yarn length when equipped with the release device, the yarn being released by the spinning head as required, allowing the end to reach the spinning rotor.
Further, the repair trolley activates the spinning head and leaves the spinning head after completion of the task, and wherein the spinning head separation release means, the end reaches the throat of the spinning rotor and triggers the spinning, so that the fibres handled by the spinning rotor are gathered at the end properly prepared, thus achieving continuity of the produced yarn.
The application has the technical effects that: the number of devices adapted to complete the cycle is reduced; reducing the yarn path between one device and another; higher precision during the yarn cutting step; the efficiency of the whole management of machine has been improved.
Drawings
Other features and advantages of the present application will become more apparent from the following description of a preferred and non-limiting embodiment thereof, in which:
fig. 1 shows a schematic cross-sectional view of an open-end spinning machine according to an embodiment of the application;
fig. 2 shows a perspective sectional view of a spinning rotor of the spinning machine of fig. 1;
fig. 3 shows 1 perspective view of an air suction mouth unit of a spinning machine according to an embodiment of the present application;
fig. 4 shows 1 cross-sectional view of an enlarged detail IV shown in fig. 3;
fig. 5 to 10 show schematic perspective views of components of the spinning machine of the application during a yarn repair sequence;
fig. 11 to 12 show perspective views of an inhalation nozzle unit according to the present application;
fig. 13 shows a front view of the inhalation nozzle unit of fig. 11;
FIG. 14 shows a cross-sectional view of the nozzle unit of FIG. 13 along section XIV-XIV of FIG. 13;
figure 15 shows a side view of the inhalation nozzle unit of figure 13;
fig. 16 shows a cross-sectional view of the nozzle unit of fig. 13 along the section XVI-XVI shown in fig. 15;
FIG. 17 shows a cross-sectional view of the nozzle unit of FIG. 13 along section XVII-XVII shown in FIG. 15;
fig. 18 shows a cross-sectional view of the inlet of the inhalation nozzle unit of fig. 13;
figure 19 shows a front view of the spinning head of the application;
FIG. 20 shows a perspective view of an lead-in group according to the application;
fig. 21 shows a side view of a step of feeding yarn into a spinning machine according to an embodiment of the application.
Elements or portions of elements common between the embodiments described below will be denoted by the same reference numerals.
Detailed Description
With reference to the preceding figures, numeral 4 generally indicates a general schematic of an open-end spinning machine according to the application.
In particular, the spinning machine 4 comprises at least one spinning head 8, the spinning head 8 having a spinning unit 12 and a winding unit 16 wound into a roll, wherein the winding unit 16 wound into a roll winds the yarn on a reel 18 obtained from the spinning unit 12 below on a tube 20.
The spinning unit 12 produces the yarn 22 by introducing a web into a spinning rotor 24.
The spinning machine 4 comprises at least one mobile repair trolley 28 in order to be able to position itself in the vicinity of each spinning head 8 and to perform repair operations of the damaged yarn 22.
The spinning machine 4 comprises at least one doffing trolley 32, which doffing trolley 32 can be positioned at each spinning head 8 and is equipped with means for picking up the tube 20 from the tube holder basket and moving the tube 20 in a known manner onto a pair of tailstocks of the winding unit 16 wound into a roll.
Preferably, the repair trolley 28 and the doffing trolley 32 penetrate each other at least partially so as to overlap each other along the patrol path of the spinning head 8 of the spinning machine 4.
Penetrating each other means that they have a shape and follow a trajectory such that they can meet and pass each other in any intermediate portion without interfering with each other.
Advantageously, the repair trolley 28 comprises a suction mouth unit 36 and an introduction group 40 of yarns.
As better described below, the suction mouth unit 36 is shaped so as to perform all the operations of grasping the end of the yarn 22 and preparing it for subsequent repair. The yarn introduction group 40 is shaped to grasp the end of the yarn 22 prepared in advance for repair and bring it in proximity to the spinning rotor 24 of the spinning unit 12 for repair with the yarn being formed.
According to an embodiment, the suction mouth unit 36 comprises a suction mouth 44, a yarn presence sensor 48 inside the suction mouth 44, a cutting device 52 for cutting the yarn 22 and a device 56 for preparing the end of the yarn 22.
The suction mouth 44 is pneumatically connected by means of a suitable duct system, not shown in the figures, with a suction device, not shown in the figures, which is able to generate the necessary low pressure to pull the yarn in; typically, the suction means comprise a fan rotatably placed by means of an electric motor.
Preferably, as better described below, the air intake mouth 44 includes a cavity 60 defining a forced passage or passageway therein for drawing the yarn 22.
The suction mouth 44 comprises a slit-shaped inlet portion 70, which inlet portion 70 pulls in the yarn and forms a straight cylindrical portion 72, in which straight cylindrical portion 72 the yarn is conveyed. The straight cylindrical suction portion 72 has a nominal inner diameter Dn.
According to one embodiment, the suction mouth 44 is provided with a flow diverter 68, which flow diverter 68 is pneumatically interposed between an inlet portion 70 and the suction duct, on which the mouth (not shown in the figures) is interposed.
The purpose of this device is to deviate from the axis of the suction duct, forcing the trajectory of the drawn yarn to change to pass inside the cavity 60. The flow diverter 68 is configured so as to ensure dimensional continuity of the suction tube inside diameter while avoiding any abrupt cross-sectional and roughness changes to avoid pinching of the yarn that could be pinched.
The flow redirector 68 is offset relative to the suction pipe by an offset (misalignment) C of the axis in the flow redirector 68; preferably, this offset 68 is related to the nominal inner diameter Dn according to the following equation: 1/2Dn < C <3/4Dn.
Due to this offset C, the air flow and the yarn drawn in thereby have a double bend: a first curvature 76 between the axis Y' of the straight cylindrical portion 72 of the suction mouth upstream of the flow diverter 68, and a second curvature 80 between the flow diverter 68 and the axis Y "of the suction duct downstream of the flow diverter 68. It should be noted that the axes Y', y″ of the suction ducts 72 upstream and downstream of the flow diverter 68 are preferably parallel to each other.
In the path between the inlet portion 70 and the flow diverter 68, the first bend 76 and the second bend 80 applied by the flow diverter 68 force the yarn tangentially through the two bends themselves, selecting a smaller distance path; this ensures that the yarn position is always on the bottom 84 of the cavity 60. The bottom 84 is formed by a portion of the cavity 60 designed to receive the drawn-in yarn.
The chamber 60 extends longitudinally along the suction duct 72 and preferably has a symmetrical cross-section with respect to a transverse plane orthogonal to the axis Y' of the straight cylindrical portion 72 of the suction mouth 72 upstream of the flow diverter 68.
The cross-section of the chamber 60 has a slightly different size and shape when passing between the various lateral portions of the suction duct 72.
According to an embodiment, the bottom 84 of the chamber 60 has a variable angle aperture 100 along the extension within the suction mouth 44, with respect to a cross-sectional plane perpendicular to the main extension axis of the chamber.
According to a possible embodiment, the cavity 60 in the first portion is narrower and then widens after the portion of the cutting device 52: this ensures a more accurate positioning during the cutting and preparation steps, which will ensure a better quality of the subsequent repair.
For example, at the cutting device 52, the angle of the hole 100 is between 80 ° and 100 °.
At the end preparation device 56, the angle of the hole is slightly narrower, i.e. between 75 ° and 95 °.
In any case, the purpose of the chamber 60 is to deliver the drawn yarn, creating as little turbulence as possible, which may disturb the movement of the air carrying the yarn.
Thus, the movement of air within the straight cylindrical portion 72 of the air intake mouth 72 should be as laminar as possible; for this purpose, the inner side surface of the straight cylindrical portion 72 of the suction mouth 72 is connected and free of roughness, which may facilitate the separation of the air fluid from the wall, thus creating turbulence. Turbulence will cause undesired displacements of the yarn, making its position indeterminate, compromising the accuracy of the relative operation.
For this reason, in order to ensure a sufficient suction phenomenon without excessively increasing the air passage speed, in practice, the air passage portion between the three portions, which are respectively:
1. the inlet portion 70 is configured to receive a fluid,
2. the end preparation device 56,
3. the cutting means 52 are provided with a cutting device,
the reduction in the pass-through area is limited. Based on the actual tests performed, it has been demonstrated that the best reduction tradeoff is between a 2.7/3.2% reduction in pass area.
According to an embodiment, the cutting means 52 are positioned in the vicinity of said cavity 60 within the mouth 44.
According to an embodiment, the end preparation device 56 of the yarn 22 is positioned, according to known systems, in proximity to said cavity 60, configured to direct a jet of compressed air onto said yarn end 22 in order to be ready for the subsequent repair step.
The operation of the open-end spinning machine according to the present application will now be described.
Specifically, the spinning machine 4 is operated continuously, producing yarn by means of the spinning unit 12; at the same time, the repair carriage 28 and doffing carriage 32 patrol the various spinning heads 8; if necessary, the repair trolley 28 performs all of the repair operations required.
In fact, in the event of yarn breakage, the repair process is actuated.
In particular, the repair method comprises the steps of:
a) The yarn breakage 22 is detected, for example by means of a further yarn presence sensor 49 mounted on the spinning head,
b) The reel 18 is stopped by means of a stop plate actuated by the spinning head 8,
c) At the same time, the repair trolley 28 is brought to the spinning head 8, where breakage of the yarn 22 occurs,
d) The reel 18 is rotated by means of a reel turning unit (not shown) of the repair carriage 28, to start searching for the end of the yarn 22 broken on the reel 18, and at the same time the suction mouth unit 36 of the repair carriage 28 is brought near the reel 18, to suck the end by actuating suction means suitably connected to the suction mouth 44,
e) The spool 18 is stopped after the yarn 22 is picked up into the suction mouth 44, (e.g., an operation detected by a yarn presence sensor housed in the suction mouth 48),
f) Actuating the cutting means 52 housed in the suction mouth 36, removing the cutting member from the reel side 18, capturing the new end made by cutting and preparing it with a jet of compressed air by means of the end preparation means 56 housed in the suction mouth 44,
g) The yarn feeding unit 40 of the repair carriage 28 is actuated, and the yarn feeding unit 40 grips the prepared yarn end and inserts it into the spinning unit 12.
According to a possible embodiment, simultaneously with steps d), e) and f), the repair trolley 28 handles the cleaning of the spinning rotor 24 and/or the cleaning of the hopper of said spinning rotor 24 and then to step g), lowering the reel 18 onto the relative stop plate.
According to a possible embodiment, simultaneously with steps f) and g), the spinning head 8 prepares the web, which discards the damaged web and feeds new fibers to the spinning rotor 24 by means of a web feed roll.
Preferably, during step g), the prepared end is picked up by the introduction group of the yarn 40, managed by the repair trolley 28, the repair trolley 28 sandwiching the end between its feed rollers 64 to bring the yarn to the spinning unit 12.
According to an embodiment, said feed roller 64 of the introduction group of yarn 40 is assisted by the action of a counter-roller which, by rotating the reel 18, prevents the formation of undesired loops which may engage with various mechanisms, so as to keep the yarn taut without slackening.
According to an embodiment, during step g), the yarn 22 is inserted in a specific path by means of the yarn displacer 51 of the feeding device through the introduction group 40 and the end is fed into the yarn output channel.
Along such a path, a release device 50 is preferably provided which, when equipped, holds an extra length of yarn, which is released by the spinning head 8, on request, allowing the end to reach the throat of the spinning rotor 24.
At this point, the repair trolley 28 enables the spinning head 8 to be actuated and to leave it after completing its task.
The spinning head 8 separates the release means, the end reaches the throat of the spinning rotor 24 and "triggers" the spinning so that the fibres processed by the spinning rotor 24 are gathered at a suitably prepared end, thus achieving the continuity of the yarn produced.
The steps of the repair cycle are summarized below, with TF (spinning head) and CR (repair carriage), respectively, in brackets, designating the means to perform each step.
Starting from the moment after the yarn break detected by the sensor, the following will occur:
1) Stopping the winding reel 18 (TF) by lifting the winding reel 18 from the drag cylinder by means of a stop plate;
2) Holes (TF) of the rubber yarn extraction roller;
3) Approaching the repair trolley 28 to the associated spinning head 8, stopping and stabilizing (CR) by actuating the parking brake;
4) A hole (CR) of the spinning unit 12;
5) Cleaning the spinning rotor 24 and the hopper (CR);
6) Closing the spinning unit 12 (CR);
7) Lifting (CR) the reel 18 from the stop plate;
8) Rotating the reel 18 by means of counter-rollers to allow searching for the end (CR);
9) Suction is performed through a suitable suction mouth 44 to capture the end (CR) of the reel 18;
10 Stopping the rotation (CR) of the reel 18;
11 Blocking the arrival (CR) of the feed unit of yarn by sandwiching the yarn between rollers 64,
12 Cutting the yarn (CR) by a small suction;
13 Preparing a newly produced yarn end (CR);
14 Lowering the reel 18 (CR) on the stop plate;
15 Preparing a web, discharging damaged fibers, and supplying new fibers (TF) to the spinning rotor 24 by rotation of the web supply roller;
16 After being fed into a specific predetermined path by the feeding group, introducing the previously prepared end into the yarn delivery Channel (CR);
17 Sending an approval signal to enter the spinning head 8 (CR);
18 Releasing the parking brake by the repair trolley 28 and leaving the spinning head 8 (CR);
19 Releasing the yarn 22 by a specific releasing means; in particular the extra length that is kept, allows to reach the Throat (TF) of the spinning rotor 24;
20 Restoring yarn extraction by resetting the rubber extraction roller; yarn production recovery (TF);
21 The rotation of the spool 18 is re-activated by the stop plate lowering the spool 18 onto the drag cylinder (TF).
And with the recovery of the winding of the reel, repairing and recovering spinning are completed.
As shown, some of the previous operations may also be performed simultaneously, as they are performed by different devices located on the repair trolley 28 (CR) or on the spinning head 8 (TF).
It will be appreciated from what has been described that the open-end spinning machine and the method of yarn repair of the open-end spinning machine according to the application allow overcoming the drawbacks set forth in the background art.
For the background art solutions, the new yarn pick-up system has several advantages.
The main advantages are:
1. reducing the number of devices adapted to complete the cycle;
2. reducing yarn paths between one device and another device;
3. higher precision during the yarn cutting step;
4. the efficiency of the whole management of machine is improved.
In more detail, the reduction of the means suitable for performing the cycle certainly requires a reduction in overall dimensions, not only of the physical means, but also of the volume required for the movement of the actuation means themselves.
Reducing the number of devices helps limit costs, as not only redundant structures (sensors, motors, actuators, etc.) but also relative energy consumption.
The overall reliability of the system will also increase, as the possible malfunctions of the mechanical parts will be reduced (the number is reduced) and also the necessary maintenance of the device will be reduced.
Furthermore, the integration of different devices allows to eliminate redundant functions, such as aspiration systems, centering units, or various sensors and motor systems allowing the movement of the device itself, to be repeated on the preparation unit in order to collect the waste.
Using a smaller number of devices for manipulating the yarn means that the number of yarn paths from one device to another is reduced; in particular, instead of three intermediate passages envisaged by the known systems (nozzle/centring unit, centring unit/preparation unit, preparation unit/supply unit), the present application provides only one intermediate passage (nozzle/supply unit).
Fewer passes allow for saving time in transferring yarn from one device to another.
The smaller number of passes also means that the yarn is less likely to "escape" during transfer, with the result that machine time is lost to resume the yarn upon resumption of circulation.
Another advantage of reducing yarn transfer is that the possibility of damaging the yarn itself is reduced, for example, by moving parts of the friction device during passage from one device to the other.
Another benefit of the new pick-up system is that it will give a higher precision in the cutting step: the distance between the end of the ready yarn, which end is to be fed into the yarn delivery tube, and the point clamped between the rollers of the feeding unit is accurately maintained and with the same accuracy, since the yarn does not have to pass further through the passage.
It is very important that the length of the yarn portion is accurate during the step of inserting the yarn delivery tube: the quality of the repair achieved during the repair step, and thus the quality of the entire yarn spool, is decisively dependent on it.
Another advantage deriving from the new pick-up system is a higher efficiency of machine management due to the reduction of yarn processing time, since not only is the passage reduced, but also the possible program re-execution time in case of "loss" during the yarn passage.
The improvement in efficiency also results from a reduction in energy consumption (fewer engines, fewer sensors, etc.) and less energy required to operate them. Furthermore, reducing maintenance (with fewer devices) has a positive impact on overall machine efficiency.
Numerous modifications and variations of the machine and repair method of the present application will occur to those skilled in the art in order to meet the contingent and specific requirements, but all are included within the scope of the application, as defined by the following claims.
Claims (20)
1. Open-end spinning machine (4) comprising at least one spinning head (8) with a spinning unit (12) for producing a yarn (22) by introducing a fibre web into a spinning rotor (24) and a winding unit (16) wound into a roll, wherein the winding unit (16) winds the yarn on a reel (18) obtained from the spinning unit (12) below onto a tube (20),
at least one repair trolley (28) movable so as to be able to position itself in the vicinity of each of the spinning heads (8) and to perform repair operations of the damaged yarn (22),
wherein,,
-the repair trolley (28) comprises: a suction mouth unit (36) shaped so as to perform all the operations of gripping the yarn ends and preparing the yarn ends for subsequent repair; and an introduction group (40) of yarns shaped to grip the yarn ends previously prepared for repair and to bring them onto the spinning rotor (24) of the spinning unit (12) in order to repair them by the yarn being formed,
wherein the suction mouth unit (36) comprises a suction mouth (44) having an inlet portion (70) from which the suction mouth unit pulls in the yarn (22) and a cutting device (52) for cutting the yarn,
characterized in that the suction mouth unit further comprises a yarn presence sensor (48) located in the suction mouth (44) and a yarn end preparation device (56) for the yarn end, and in that the inlet portion (70) develops into a straight cylindrical portion (72) into which the yarn is fed and into which the straight cylindrical portion develops into a suction tube having an inner diameter Dn,
and wherein the suction mouth (44) comprises a cavity (60) therein defining a passage into which the drawn yarn is forced, wherein the cross-section of the passage of air in the straight cylindrical portion (72) of the suction mouth decreases from the inlet portion (70) to the yarn end preparation device (56) and from the yarn end preparation device (56) to the cutting device (52).
2. Open-end spinning machine (4) according to claim 1, characterized in that the suction mouth (44) is provided with a flow diverter (68) pneumatically interposed between the straight cylindrical portion (72) and the suction duct, the flow diverter (68) diverting the axis of the straight cylindrical portion (72) of the suction mouth, forcing the trajectory of the sucked yarn through the inside of the cavity (60).
3. Open-end spinning machine (4) according to claim 2, characterized in that the flow diverter (68) is offset from the straight cylindrical portion (72) of the suction mouth by an offset C of the axis in the flow diverter (68).
4. An open-end spinning machine (4) according to claim 3, characterized in that the offset C is related to the inner diameter Dn according to: 1/2Dn < C <3/4Dn.
5. Open-end spinning machine (4) according to claim 2, 3 or 4, characterized in that the flow diverter has a double bend: -a first bend (76) on the flow diverter (68) on the axis Y' side of the straight cylindrical portion (72) of the suction mouth; and a second bend (80) in the flow diverter (68) on the axis Y '' side of the suction duct.
6. Open-end spinning machine (4) according to claim 5, characterized in that said axis Y' and said axis y″ are parallel to each other.
7. Open-end spinning machine (4) according to any one of claims 1 to 4, characterized in that the cavity (60) has an aperture angle (100) in a plane perpendicular to the main extension axis of the cavity, the extension of the Kong Jiaodu inside the suction mouth (44) being variable.
8. Open-end spinning machine (4) according to claim 7, characterized in that at the cutting device (52) the hole angle (100) is at 80 o To 100 o Between them.
9. Open-end spinning machine (4) according to claim 7, characterized in that at the yarn end preparation device (56), the hole angle is 75 o To 95 to o Between them.
10. Open-end spinning machine (4) according to any one of claims 1 to 4, characterized in that, in the vicinity of the cavity (60), the cutting device (52) is positioned inside the suction mouth (44).
11. Open-end spinning machine (4) according to any one of claims 1 to 4, characterized in that, in the vicinity of the cavity (60), the yarn end preparation device (56) of the yarn is positioned and configured to direct a jet of compressed air onto the yarn end.
12. Open-end spinning machine (4) according to any one of claims 1 to 4, characterized in that the spinning machine (4) comprises at least one doffing trolley (32) positionable at each spinning head (8) and equipped with a device for picking up a tube (20) from a tube holder basket and moving it to a pair of tailstocks of the winding unit (16) wound into a roll.
13. Open-end spinning machine (4) according to claim 12, characterized in that the repair trolley (28) and the doffing trolley (32) pass at least partially through each other so as to overlap each other along the patrol path of the spinning head (8) of the spinning machine (4).
14. Method for repairing a yarn (22) in an open-end spinning machine (4) according to any one of claims 1 to 13, characterized in that it comprises the following steps:
step a: detecting the breakage of the yarn (22) by means of a yarn presence sensor (49) mounted on the spinning head,
step b: stopping the reel (18) using a stopping plate driven by the spinning head (8),
step c: at the same time, the repair trolley (28) is brought to the spinning head (8) where the breakage of the yarn (22) occurs,
step d: rotating the reel (18) by means of the repair trolley (28) to start searching for broken yarn ends of the yarn on the reel (18) and simultaneously bringing the suction mouth unit (36) of the repair trolley (28) in proximity of the reel (18) to suck the yarn ends by actuating suction means connected to the suction mouth (44),
step e: stopping the reel (18) after the yarn is picked up in the suction mouth (44),
step f: actuating the cutting device (52) housed in the suction mouth (44), removing the cut-off segment from the reel (18), capturing the new yarn end made by cutting and preparing said new yarn end with a jet of compressed air by means of a yarn end preparation device (56) housed in the suction mouth (44),
step g: -actuating an introduction group (40) of yarns of the repair trolley (28), which grips a prepared yarn end and inserts it into the spinning unit (12).
15. Method according to claim 14, characterized in that, simultaneously with said step d, said step e and said step f, said repair trolley (28) cleans said spinning rotor (24) and/or a funnel of said spinning rotor (24) and then said step g lowers said reel (18) onto the relative stop plate.
16. Method according to claim 14 or 15, characterized in that also simultaneously with step f and step g the spinning head (8) prepares the web, discards the damaged web and feeds new fibers to the spinning rotor (24) using a web feed roller.
17. Method according to claim 14 or 15, characterized in that during said step g, the ready yarn end is picked up by the yarn introduction group (40), managed by the repair trolley (28) which clamps the yarn end between the feed rollers (64) of the yarn introduction group to bring the yarn end to the spinning unit (12).
18. The method according to claim 17, characterized in that the feed roller (64) of the yarn introduction group (40) is assisted by the action of a counter roller which prevents the formation of undesired loops engageable with various mechanisms by rotating the reel (18) in order to keep the yarn taut without slackening.
19. Method according to claim 14 or 15, characterized in that during said step g the yarn (22) is inserted through the yarn introduction group (40) into a specific path and the yarn end is introduced into the yarn output channel, wherein a release device is provided along said specific path, wherein an additional yarn length is maintained when equipping the release device, which yarn is released by the spinning head (8) as required, allowing the yarn end to reach the spinning rotor (24).
20. Method according to claim 19, characterized in that the repair trolley (28) activates the spinning head (8) and leaves the spinning head after completion of the task, and in that the spinning head (8) is released from the release device, the yarn end reaches the throat of the spinning rotor (24) and triggers spinning, so that the fibers processed by the spinning rotor (24) are gathered at the ready yarn end, whereby continuity of the produced yarn is achieved.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| IT201700135982 | 2017-11-27 | ||
| IT102017000135982 | 2017-11-27 |
Publications (2)
| Publication Number | Publication Date |
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| CN109837619A CN109837619A (en) | 2019-06-04 |
| CN109837619B true CN109837619B (en) | 2023-10-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821961583.4U Withdrawn - After Issue CN209669418U (en) | 2017-11-27 | 2018-11-26 | Free end type spinning machine |
| CN201811416677.8A Active CN109837619B (en) | 2017-11-27 | 2018-11-26 | Open-end spinning machine and method for repairing yarn in an open-end spinning machine |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821961583.4U Withdrawn - After Issue CN209669418U (en) | 2017-11-27 | 2018-11-26 | Free end type spinning machine |
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| Country | Link |
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| EP (1) | EP3489399B1 (en) |
| CN (2) | CN209669418U (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3489399B1 (en) * | 2017-11-27 | 2021-06-09 | Savio Macchine Tessili S.p.A. | Open-end type spinning machine with enhanced intake nozzle unit and relative piecing method |
| DE102019120592A1 (en) * | 2019-07-30 | 2021-02-04 | Maschinenfabrik Rieter Ag | Method for piecing a spinning nozzle of an air-jet spinning machine and air-jet spinning machine |
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| DE3123282C1 (en) * | 1981-06-12 | 1988-12-22 | Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt | Device for picking up a thread from a bobbin and transferring it to a working organ |
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- 2018-11-22 EP EP18207907.9A patent/EP3489399B1/en active Active
- 2018-11-26 CN CN201821961583.4U patent/CN209669418U/en not_active Withdrawn - After Issue
- 2018-11-26 CN CN201811416677.8A patent/CN109837619B/en active Active
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| JPS5969373A (en) * | 1982-10-13 | 1984-04-19 | Toyoda Autom Loom Works Ltd | Upward moving mechanism for bobbin holder |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN209669418U (en) | 2019-11-22 |
| EP3489399A1 (en) | 2019-05-29 |
| CN109837619A (en) | 2019-06-04 |
| EP3489399B1 (en) | 2021-06-09 |
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