EP3748054B1 - Ring spinning machine comprising a lappet tilting apparatus and an automatic yarn piecing assembly - Google Patents
Ring spinning machine comprising a lappet tilting apparatus and an automatic yarn piecing assembly Download PDFInfo
- Publication number
- EP3748054B1 EP3748054B1 EP20177969.1A EP20177969A EP3748054B1 EP 3748054 B1 EP3748054 B1 EP 3748054B1 EP 20177969 A EP20177969 A EP 20177969A EP 3748054 B1 EP3748054 B1 EP 3748054B1
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- EP
- European Patent Office
- Prior art keywords
- yarn
- lappet
- automatic
- piecing
- tubular arrangement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 238000007378 ring spinning Methods 0.000 title claims description 33
- 238000000034 method Methods 0.000 claims description 9
- 239000004753 textile Substances 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 3
- 238000009987 spinning Methods 0.000 description 15
- 230000008569 process Effects 0.000 description 5
- 230000000712 assembly Effects 0.000 description 4
- 238000000429 assembly Methods 0.000 description 4
- 238000003780 insertion Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 241000208202 Linaceae Species 0.000 description 1
- 235000004431 Linum usitatissimum Nutrition 0.000 description 1
- 239000004614 Process Aid Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002657 fibrous material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H15/00—Piecing arrangements ; Automatic end-finding, e.g. by suction and reverse package rotation; Devices for temporarily storing yarn during piecing
Definitions
- the present invention relates to textile spinning machines. Particularly, the present invention relates to a ring spinning machine according to the preamble of claim 1.
- ring spinning machines are generally employed for spinning of fibres, such as cotton, flax or wool, to produce a yarn.
- Fiber material may be supplied to the ring spinning machines in the form of rovings.
- the ring spinning machine draws the rovings to the desired degree of fineness and imparts sufficient twist, and finally forms a continuous yarn, which is then wound onto the bobbins for storage.
- Yarn breakage is an unavoidable plight in the ring spinning machines during the spinning operation.
- the piecing of the broken yarns is required for efficient and continuous operation of the ring spinning machine, and the process is called as yarn piecing.
- Yarn piecing is a manual process in which the broken yarns are joined/ assembled. Hence, this process aids in restarting the yarn spinning sequence at a swift rate.
- Yarn piecing process may be crucial in yarn spinning operation that determines the rate of productivity.
- automatic piecing assembly With the advent of modern technology, automatic piecing assembly have been employed in the spinning mills over the manual piecing operation.
- automatic piecing assemblies are mounted on guide rails provided in vicinity of frame of the ring spinning machines.
- the automatic piecing assemblies may employ automatic piecing equipment like robotic arms or may be configured to accommodate an operator for piecing.
- Said automatic piecing assemblies may traverse over the guide rails throughout the length of a frame of the ring spinning machine and carryout piecing operation at required spinning stations.
- the piecing assemblies may be mounted on a platform, which traverse on the mill floor for carrying the piecing assembly throughout the length of the ring spinning machine for performing piecing operations.
- automatic piecing assembly comprises plurality of modules for yarn pickup from bobbin, yarn insertion into the traveller and yarn piecing at drafting and the like.
- Each spinning stations of a ring spinning machine comprises roving supply package, drafting unit, broken yarn collection tube, yarn breakage detection arrangement, yarn guide hook or lappet, balloon controller ring, ring-traveller assembly, yarn bobbin fitted on the rotating spindle, spindle driving assembly etc.
- the delivered yarn from the drafting unit travels through lappet hook, balloon controller ring and then through ring traveller before winding on to the rotating bobbin.
- the broken end of yarn from the bobbin has to be taken off up to the drafting unit for piecing it with delivery fibre federation.
- Plurality of lappet hooks are serially mounted on a lappet rod of a spinning machine in such a way that one lappet hook for each spinning station.
- Said lappet hook is a small convolute shaped steel pin with an eyelet located at the center thereof. The yarn passes through said eyelet of the lappet hook and guided properly to maintain a fixed path. Before piecing operation takes place, inserting the yarn into the lappet hook eyelet is a tricky process for an Automatic piecing unit because of the convolute hook construction in the lappet.
- EP 0 518 029 A1 discloses a procedure and device for searching for a yarn end or for laying an auxiliary yarn at a cops respectively around a cops or empty tube.
- EP 2 105 401 A2 is directed to a yarn end retrieving apparatus.
- Said apparatus includes a yarn releasing device that sucks and releases a yarn end from a surface of a bobbin, a cutter device that cuts the yarn sucked out by the yarn releasing device and a cylinder elevating and lowering device that elevates and lowers a suction cylinder.
- the cylinder elevating and lowering device is composed of a guide member, a slider that slidably elevates and lowers along the guide member, and a driving structure that uses a stepping motor as a driving source.
- the suction cylinder is fixed to the slider so as to be moveable together with a slider. Power of the stepping motor is used to elevate and lower the suction cylinder.
- An object of the present invention is to provide a lappet tilting apparatus in the yarn pickup module of an automatic yarn piecing assembly of textile ring spinning machines.
- Another object of the present invention is to provide a lappet tilting apparatus that offers hassle-free yarn insertion into the lappet hook eyelet after tail yarn pickup from the bobbin.
- the present invention provides a ring spinning machine according to claim 1.
- the present invention provides a method of piecing a tail yarn by an automatic yarn piecing assembly in a textile ring spinning machine according to claim 9.
- a ring spinning frame 1 the supply fibre federation or roving 2 is spun into yarn 3 by way of linear stretching using a drafting unit 4.
- the produced yarn 3 is guided through a lappet hook 5, a balloon controller ring 6, a ring-traveller assembly (not shown) and subsequently wound on to a ring yarn bobbin 7 before further processing.
- a ring spinning frame 1 during yarn breakage, there is a need for automatic yarn piecing to continue the ring spinning operation that is provided by an automatic yarn piecing assembly 8 for textile ring spinning machines to facilitate automatic piecing operation.
- the automatic yarn piecing assembly 8 in a ring spinning frame 1 comprises a yarn pickup module 9 mounted on a vertical column.
- the yarn pickup module 9 is configured to slide in both horizontal and vertical directions.
- the yarn pickup module 9 has a suction bell unit mounted therein.
- the suction bell unit has an elbow tubular arrangement 10 that has a first end and a second end. The first end is connected to a vacuum source (not shown), whereas the second end hangs freely. This free end forms a suction bell 11.
- the suction bell 11 is an open mouth configuration defined at the second end of the elbow tubular arrangement 10. Accordingly, the first end and the second end are also defined as fixed end and free end respectively.
- the elbow tubular arrangement 10 is flexible enough to move up and down in vertical direction.
- said free end of elbow tubular arrangement 10 is provided with a lappet tilting apparatus 12 such that said lappet tilting apparatus 12 encircles the suction bell 11 and can slide over the elbow tubular arrangement 10 and makes impermanent slippery contact with a lappet hook 5 of ring spinning machine 1 during tail yarn pickup in a piecing operation. That is, lappet tilting apparatus 12 can be freely slidable in up and down direction over the suction bell 11 on the elbow tubular arrangement 10 as shown by arrow in the Figure 2 of the present invention.
- the lappet tilting apparatus 12 has an upper portion and a lower portion that are connected and positioned along the common axis.
- the upper portion has a tubular structure.
- the lower portion has a configuration showing frustum of a hollow solid having a slant external surface.
- the hollow solid can be a hollow cone or a pyramid.
- the automatic yarn piecing assembly 8 further comprises a driving means coupled to the yarn pickup module 9 for moving the yarn pickup module 9 vertically up and down and horizontally far and away.
- the driving means can be a pneumatic driving unit, or a hydraulic driving unit having piston and cylinder arrangement with actuators.
- the drive means can also comprise of screw rod, cylinder and all types of actuating means.
- the yarn piecing assembly 8 includes a control apparatus functionally connected with driving means comprising a control unit coupled with a plurality of sensors and stoppers for precisely controlling the movement of moving yarn pickup module 9 so as to move the suction bell 11 vertically up and down.
- a negative pressure is created in elbow tubular arrangement 10 using vacuum source (not shown).
- the automatic yarn piecing assembly 8 is positioned away from the lappet hook 5.
- the yarn pickup module 9 of the suction bell unit is moved towards the yarn path by providing horizontal and vertical movement to the yarn pickup module 9 and vertical movement to the elbow tubular arrangement 10 such that the lappet tilting apparatus 12 hits a lappet hook 5 and makes it to swivel away from its home position wherein the swivelling action is supported by the lappet rod 13 mounted in the ring spinning machine 1.
- the suction bell 11 accesses the yarn axis to suck the tail yarn 3 from bobbin 7.
- the tail yarn 3 is picked on the bobbin 7 anywhere in the chase length from bottom to top.
- Figure 4 illustrates the yarn 3 pickup for another chase length position at the top of the yarn bobbin 7. While the yarn 3 breaks at top chase wound length of the bobbin 7, it is difficult for the suction bell 11 to enter near the bobbin 7 because of the size of the tilting apparatus 12 which cannot penetrate through the balloon controller ring 6.
- the bottom face of lappet tilting apparatus 12 seats over above the balloon controller ring 6 while the suction bell 11 moves down and penetrates further to reach the position above the yarn bobbin 7.
- the lappet tilting apparatus 12 freely slides over the suction bell 11 on the elbow tubular arrangement 10. Meanwhile the lifted lappet hook 5 swivels out of yarn path because of the the support of tapered conical surface in tilting apparatus 12.
- the suction bell 11 moves up from the yarn bobbin 7 after sucking the yarn 3 and engages with the tilting apparatus 12 that is resting over the balloon controller ring 6 and then the yarn pickup module 9 along with the suction bell 11 and lappet tilting apparatus 12 moves up further as a whole and carry the yarn 3 upwards further for piecing operation.
- the lappet tilting apparatus 12 as described herein above provides a hassle-free yarn insertion into the lappet hook 5 eyelet and smooth functioning of automatic yarn piecing assembly 8 without any hindrance.
- the suction bell 11 can be positioned above the bobbin 7 at a distance normally in the range of 5mm to 15mm for picking the tail yarn 3.
- the lappet tilting apparatus 12 is capable of sliding over the suction bell 11 on the tubular arrangement 10 for a distance of approximately 60mm for allowing the suction bell 11 to efficiently pick the tail yarn 3 from the top chase length position of the bobbin 7 irrespective of the hindrance caused by the balloon controller ring 6.
- the above described automatic piecing assembly for ring spinning machine provides a reliable solution for picking the broken yarn end from the bobbin and enables automatic piecing operation.
- the elbow tubular arrangement with the suction bell and the lappet tilting apparatus is able to pick the broken yarn from the bobbin anywhere from bottom to top based on the broken yarn position.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
Description
- The present invention relates to textile spinning machines. Particularly, the present invention relates to a ring spinning machine according to the preamble of
claim 1. - In textile industry, ring spinning machines are generally employed for spinning of fibres, such as cotton, flax or wool, to produce a yarn. Fiber material may be supplied to the ring spinning machines in the form of rovings. Further, the ring spinning machine draws the rovings to the desired degree of fineness and imparts sufficient twist, and finally forms a continuous yarn, which is then wound onto the bobbins for storage. Yarn breakage is an unavoidable plight in the ring spinning machines during the spinning operation. Hence, the piecing of the broken yarns is required for efficient and continuous operation of the ring spinning machine, and the process is called as yarn piecing. Yarn piecing is a manual process in which the broken yarns are joined/ assembled. Hence, this process aids in restarting the yarn spinning sequence at a swift rate. Yarn piecing process may be crucial in yarn spinning operation that determines the rate of productivity.
- Conventionally, piecing of the broken yarns was performed manually, while the operator of the spinning machine moves around the spinning zones and identify the broken yarns to piece them together. In the manual piecing operation, the operator may have to periodically check through the length of the frame which may be normally of about 75 meters long and may include about 1600 spindles. In addition to periodic monitoring, the broken yarns have to be pieced and the corresponding yarn spinning sequence has to be restarted timely, in order to avoid wastage of yarn. Since, several ring spinning machines of this kind are installed in one spinning mill close to each other, it becomes tedious for the operator to access into the gangways for monitoring the ring spinning machine.
- With the advent of modern technology, automatic piecing assembly have been employed in the spinning mills over the manual piecing operation. Generally, automatic piecing assemblies are mounted on guide rails provided in vicinity of frame of the ring spinning machines. The automatic piecing assemblies may employ automatic piecing equipment like robotic arms or may be configured to accommodate an operator for piecing. Said automatic piecing assemblies may traverse over the guide rails throughout the length of a frame of the ring spinning machine and carryout piecing operation at required spinning stations. The piecing assemblies may be mounted on a platform, which traverse on the mill floor for carrying the piecing assembly throughout the length of the ring spinning machine for performing piecing operations. In general, automatic piecing assembly comprises plurality of modules for yarn pickup from bobbin, yarn insertion into the traveller and yarn piecing at drafting and the like.
- Each spinning stations of a ring spinning machine comprises roving supply package, drafting unit, broken yarn collection tube, yarn breakage detection arrangement, yarn guide hook or lappet, balloon controller ring, ring-traveller assembly, yarn bobbin fitted on the rotating spindle, spindle driving assembly etc. The delivered yarn from the drafting unit travels through lappet hook, balloon controller ring and then through ring traveller before winding on to the rotating bobbin. During yarn spinning process, in case of any yarn breakage, the broken end of yarn from the bobbin has to be taken off up to the drafting unit for piecing it with delivery fibre federation.
- Plurality of lappet hooks are serially mounted on a lappet rod of a spinning machine in such a way that one lappet hook for each spinning station. Said lappet hook is a small convolute shaped steel pin with an eyelet located at the center thereof. The yarn passes through said eyelet of the lappet hook and guided properly to maintain a fixed path. Before piecing operation takes place, inserting the yarn into the lappet hook eyelet is a tricky process for an Automatic piecing unit because of the convolute hook construction in the lappet.
- Accordingly, there is a need of a lappet tilting apparatus in automatic yarn piecing assembly of textile ring spinning machines that overcomes the above shortcoming.
-
DE 30 13 174 A1 discloses a ring spinning machine according to the preamble ofclaim 1. -
EP 0 518 029 A1 discloses a procedure and device for searching for a yarn end or for laying an auxiliary yarn at a cops respectively around a cops or empty tube. -
EP 2 105 401 A2 is directed to a yarn end retrieving apparatus. Said apparatus includes a yarn releasing device that sucks and releases a yarn end from a surface of a bobbin, a cutter device that cuts the yarn sucked out by the yarn releasing device and a cylinder elevating and lowering device that elevates and lowers a suction cylinder. The cylinder elevating and lowering device is composed of a guide member, a slider that slidably elevates and lowers along the guide member, and a driving structure that uses a stepping motor as a driving source. The suction cylinder is fixed to the slider so as to be moveable together with a slider. Power of the stepping motor is used to elevate and lower the suction cylinder. - These objectives are provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. These objectives are not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
- An object of the present invention is to provide a lappet tilting apparatus in the yarn pickup module of an automatic yarn piecing assembly of textile ring spinning machines.
- Another object of the present invention is to provide a lappet tilting apparatus that offers hassle-free yarn insertion into the lappet hook eyelet after tail yarn pickup from the bobbin.
- Object of the present invention is not limited to the above-mentioned problem. Other technical problems that are not mentioned will become apparent to those skilled in the art from the following description.
- The present invention provides a ring spinning machine according to
claim 1. - Furthermore, the present invention provides a method of piecing a tail yarn by an automatic yarn piecing assembly in a textile ring spinning machine according to
claim 9. - Other aspects and advantages of the invention will become apparent from the following description, taken in conjunction with the accompanying drawing, illustrating by way of example the principles of the invention.
- For a more detailed understanding of this invention, reference is made to the accompanying drawings in which:
-
Figure 1 illustrates the automatic piecing assembly in a ring spinning machine according to the present invention; -
Figure 2 illustrates the mounting arrangement for yarn pickup module of automatic piecing assembly, according to an embodiment of the present invention; and -
Figures 3 &4 show working of lappet tilting apparatus in two different bobbin chase lengths according to the present invention. - Persons skilled in the art will appreciate that elements in the figures are illustrated for simplicity and clarity and may have not been drawn to scale. For example, the dimensions of some of the elements in the figure may be exaggerated relative to other elements to help to improve understanding of various exemplary embodiments of the present disclosure.
- Throughout the drawings, it should be noted that like reference numbers are used to depict the same or similar elements, and features.
- The following description with reference to the accompanying drawings is provided to assist in a comprehensive understanding of exemplary embodiments of the invention as defined by the claims and their equivalents. It includes various specific details to assist in that understanding but these are to be regarded as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
- In a
ring spinning frame 1, the supply fibre federation or roving 2 is spun intoyarn 3 by way of linear stretching using adrafting unit 4. The producedyarn 3 is guided through alappet hook 5, aballoon controller ring 6, a ring-traveller assembly (not shown) and subsequently wound on to aring yarn bobbin 7 before further processing. In thering spinning frame 1, during yarn breakage, there is a need for automatic yarn piecing to continue the ring spinning operation that is provided by an automaticyarn piecing assembly 8 for textile ring spinning machines to facilitate automatic piecing operation. - As shown in
Figure 1 , the automaticyarn piecing assembly 8 in aring spinning frame 1 comprises ayarn pickup module 9 mounted on a vertical column. Theyarn pickup module 9 is configured to slide in both horizontal and vertical directions. Theyarn pickup module 9 has a suction bell unit mounted therein. The suction bell unit has anelbow tubular arrangement 10 that has a first end and a second end. The first end is connected to a vacuum source (not shown), whereas the second end hangs freely. This free end forms asuction bell 11. Thesuction bell 11 is an open mouth configuration defined at the second end of theelbow tubular arrangement 10. Accordingly, the first end and the second end are also defined as fixed end and free end respectively. Theelbow tubular arrangement 10 is flexible enough to move up and down in vertical direction. Further, said free end of elbowtubular arrangement 10 is provided with alappet tilting apparatus 12 such that saidlappet tilting apparatus 12 encircles thesuction bell 11 and can slide over theelbow tubular arrangement 10 and makes impermanent slippery contact with alappet hook 5 ofring spinning machine 1 during tail yarn pickup in a piecing operation. That is,lappet tilting apparatus 12 can be freely slidable in up and down direction over thesuction bell 11 on theelbow tubular arrangement 10 as shown by arrow in theFigure 2 of the present invention. - The
lappet tilting apparatus 12 has an upper portion and a lower portion that are connected and positioned along the common axis. The upper portion has a tubular structure. The lower portion has a configuration showing frustum of a hollow solid having a slant external surface. The hollow solid can be a hollow cone or a pyramid. Even though few configurations have been identified in the specification, the other configurations which are known to the person skilled in the art can be readily employed as per the requirement of the present invention. - The automatic
yarn piecing assembly 8 further comprises a driving means coupled to theyarn pickup module 9 for moving theyarn pickup module 9 vertically up and down and horizontally far and away. The driving means can be a pneumatic driving unit, or a hydraulic driving unit having piston and cylinder arrangement with actuators. The drive means can also comprise of screw rod, cylinder and all types of actuating means. Theyarn piecing assembly 8 includes a control apparatus functionally connected with driving means comprising a control unit coupled with a plurality of sensors and stoppers for precisely controlling the movement of movingyarn pickup module 9 so as to move thesuction bell 11 vertically up and down. - For yarn pickup function, a negative pressure is created in
elbow tubular arrangement 10 using vacuum source (not shown). - In the process of piecing operation, initially the automatic
yarn piecing assembly 8 is positioned away from thelappet hook 5. Before piecing operation, theyarn pickup module 9 of the suction bell unit is moved towards the yarn path by providing horizontal and vertical movement to theyarn pickup module 9 and vertical movement to theelbow tubular arrangement 10 such that thelappet tilting apparatus 12 hits alappet hook 5 and makes it to swivel away from its home position wherein the swivelling action is supported by thelappet rod 13 mounted in thering spinning machine 1. Thus, thesuction bell 11 accesses the yarn axis to suck thetail yarn 3 frombobbin 7. Thetail yarn 3 is picked on thebobbin 7 anywhere in the chase length from bottom to top. Meanwhile the front end of the liftedlappet hook 5 is loosely supported by the tapered conical surface of thelappet tilting apparatus 12. This impermanent slippery contact betweenlappet hook 5 and tiltingapparatus 12 continues to exist till the yarn take off. After sucking theyarn 3, thesuction bell 11 and the associatedlappet tilting apparatus 12 is moved up by moving theelbow tubular arrangement 10 from theyarn bobbin 7, and thereby thelappet hook 5 falls back to home position in the yarn path, thereby theyarn 3 is inserted into the eyelet of thelappet hook loop 5. With the carriedyarn 3, theelbow tubular arrangement 10 moves back from the yarn path and reaches upwards for subsequent piecing operation.Figure 3 illustrates the yarn pickup for bottom chase length position of theyarn bobbin 9 according to an embodiment of the present invention. -
Figure 4 illustrates theyarn 3 pickup for another chase length position at the top of theyarn bobbin 7. While theyarn 3 breaks at top chase wound length of thebobbin 7, it is difficult for thesuction bell 11 to enter near thebobbin 7 because of the size of the tiltingapparatus 12 which cannot penetrate through theballoon controller ring 6. The bottom face oflappet tilting apparatus 12 seats over above theballoon controller ring 6 while thesuction bell 11 moves down and penetrates further to reach the position above theyarn bobbin 7. Thelappet tilting apparatus 12 freely slides over thesuction bell 11 on theelbow tubular arrangement 10. Meanwhile the liftedlappet hook 5 swivels out of yarn path because of the the support of tapered conical surface in tiltingapparatus 12. Thesuction bell 11 moves up from theyarn bobbin 7 after sucking theyarn 3 and engages with the tiltingapparatus 12 that is resting over theballoon controller ring 6 and then theyarn pickup module 9 along with thesuction bell 11 andlappet tilting apparatus 12 moves up further as a whole and carry theyarn 3 upwards further for piecing operation. Thelappet tilting apparatus 12 as described herein above provides a hassle-free yarn insertion into thelappet hook 5 eyelet and smooth functioning of automaticyarn piecing assembly 8 without any hindrance. - According to an embodiment of the present invention, the
suction bell 11 can be positioned above thebobbin 7 at a distance normally in the range of 5mm to 15mm for picking thetail yarn 3. As shown infigure 4 , thelappet tilting apparatus 12 according to the present invention is capable of sliding over thesuction bell 11 on thetubular arrangement 10 for a distance of approximately 60mm for allowing thesuction bell 11 to efficiently pick thetail yarn 3 from the top chase length position of thebobbin 7 irrespective of the hindrance caused by theballoon controller ring 6. - Thus, the above described automatic piecing assembly for ring spinning machine provides a reliable solution for picking the broken yarn end from the bobbin and enables automatic piecing operation. The elbow tubular arrangement with the suction bell and the lappet tilting apparatus is able to pick the broken yarn from the bobbin anywhere from bottom to top based on the broken yarn position.
Claims (9)
- A ring spinning machine (1) comprising a swivel lappet hook (5) and an automatic yarn piecing assembly (8) for the ring spinning machine, said automatic yarn piecing assembly comprising:a yarn pickup module (9) mounted on a vertical column, said yarn pickup module (9) being capable of sliding on the vertical column in a vertical direction and a horizontal direction;a suction bell unit mounted on the yarn pickup module (9), said suction bell unit having an elbow tubular arrangement (10), the elbow tubular arrangement (10) having a first end and a second end, the first end connected to a vacuum source that creates negative pressure to suck a tail yarn (3) from a yarn bobbin (7), the second end defining a suction bell (11), said elbow tubular arrangement (10) being flexible to move up and down in a vertical direction; characterized bya lappet tilting apparatus (12) provided on the second end of the elbow tubular arrangement (10), said lappet tilting apparatus (12) encircling the suction bell (11), said lappet tilting apparatus (12) being capable of sliding over the elbow tubular arrangement (10) and of making impermanent slippery contact with the lappet hook (5) of the ring spinning machine (1) during tail yarn (3) pickup during a piecing operation, thereby making said lappet hook (5) to swivel away from a home position,said elbow tubular arrangement (10) and said associated lappet tilting apparatus (12) being vertically movable up in the yarn path such that the lappet hook (5) falls back to the home position thereby inserting the yarn (3) into the eyelet of the lappet hook loop; and said elbow tubular arrangement (10), which is carrying the yarn, is capable of further moving upwards to enable the automatic piecing operation.
- The automatic yarn piecing assembly as claimed in claim 1, wherein said lappet tilting apparatus (12) has an upper portion and a lower portion, the upper portion and the lower portion are connected and positioned along a common axis.
- The automatic yarn piecing assembly as claimed in claim 2, wherein said upper portion has a tubular structure.
- The automatic yarn piecing assembly as claimed in claim 2, wherein said lower portion has a configuration showing frustum of hollow solid having a slant external surface.
- The automatic yarn piecing assembly as claimed in claim 1, further comprises a control unit coupled with a plurality of sensors and stoppers for precisely controlling the movement of yarn pickup module (9).
- The automatic yarn piecing assembly as claimed in claim 1, wherein the suction bell (11) is positioned above the bobbin (7) at a distance in the range of 5mm to 15mm for picking the tail yarn (3).
- The automatic yarn piecing assembly as claimed in claim 1, wherein said lappet tilting apparatus (12) is capable of sliding over the suction bell (11) on the tubular arrangement (10) up to 60mm for allowing the suction bell (11) to pick the tail yarn (3) from the top chase length position of the bobbin (7).
- The automatic yarn piecing assembly as claimed in claim 1, wherein the suction bell (11) is configured to pick tail yarn (3) from the bobbin (7) at the bottom of the chase length.
- A method of piecing a tail yarn (3) by an automatic yarn piecing assembly (8) in a textile ring spinning machine (1) according to any of the claims 1 to 8, the method comprising the steps of:moving a suction bell end (11) of an elbow tubular arrangement (10) and the associated yarn pickup module (9) towards the yarn path by providing horizontal and vertical movement to the yarn pickup module (9) and vertical movement to the elbow tubular arrangement (10), such that a lappet tilting apparatus (12) hitting a swivel lappet hook (5) of the ring spinning machine thereby making said lappet hook (5) to swivel away from a home position, said lappet tilting apparatus (12) being capable of sliding over the elbow tubular arrangement (10);picking the tail yarn (3) from a bobbin (7) by a suction pull into an open mouth of the suction bell (11) in the elbow tubular arrangement (10), wherein the tail yarn (3) is picked on the bobbin (7) anywhere in the chase length from bottom to top;moving said elbow tubular arrangement (10) and the associated lappet tilting apparatus (12) vertically up in the yarn path such that the lappet hook (5) falls back to the home position thereby inserting the yarn (3) into the eyelet of the lappet hook loop; andmoving the elbow tubular arrangement (10), which is carrying the yarn (3) further upwards to enable the automatic piecing operation in the textile ring spinning machine (1).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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IN201941022424 | 2019-06-06 |
Publications (2)
Publication Number | Publication Date |
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EP3748054A1 EP3748054A1 (en) | 2020-12-09 |
EP3748054B1 true EP3748054B1 (en) | 2023-02-22 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP20177969.1A Active EP3748054B1 (en) | 2019-06-06 | 2020-06-03 | Ring spinning machine comprising a lappet tilting apparatus and an automatic yarn piecing assembly |
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EP (1) | EP3748054B1 (en) |
CN (1) | CN112048793B (en) |
Family Cites Families (12)
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US3728852A (en) * | 1971-06-03 | 1973-04-24 | Maremont Corp | Servicing assembly for automatic yarn piecing apparatus |
US3868813A (en) * | 1973-02-01 | 1975-03-04 | Heberlein Hispano Sa | Device for winding-off yarn ends |
DE3013174A1 (en) * | 1980-04-03 | 1981-10-15 | Zinser Textilmaschinen Gmbh, 7333 Ebersbach | Suction-bell for pneumatic retrieval of broken yarn - has flexible shield plate attached to lower lip |
IT1227728B (en) * | 1988-12-23 | 1991-05-06 | Savio Spa | PROCEDURE AND DEVICE TO JOIN AND RE-ATTACH THE WIRE TO THE WICK IN A RING THREADER |
DE4119382A1 (en) * | 1991-06-12 | 1992-12-17 | Zinser Textilmaschinen Gmbh | METHOD AND DEVICE FOR SEARCHING A THREAD ENDING OR POSING AN AUXILIARY THREAD ON A KOPS OR. ON A COP OR AN EMPTY SLEEVE |
JPH07166440A (en) * | 1993-10-20 | 1995-06-27 | Howa Mach Ltd | Sensor for success in piecing of yarn piecer |
IT1299799B1 (en) * | 1998-05-27 | 2000-04-04 | Gaudino Spa Off | AUTOMATIC REFITTING PROCEDURE OF THE THREAD IN FORMATION IN A THREADING MACHINE AND ITS DEVICE. |
DE10124270A1 (en) * | 2001-05-18 | 2002-12-05 | Volkmann Gmbh | Method for "restarting a twisting device after a thread break" |
JP4001052B2 (en) * | 2003-05-13 | 2007-10-31 | 株式会社豊田自動織機 | Yarn cutting method during doffing in a spinning machine |
JP2009242027A (en) * | 2008-03-28 | 2009-10-22 | Murata Mach Ltd | Yarn end retrieving apparatus of bobbin |
ITMI20110978A1 (en) * | 2011-05-30 | 2012-12-01 | Savio Macchine Tessili Spa | SUCTION DEVICE FOR SERVICE TROLLEYS FOR OPEN-END YARNS |
EP3556919A1 (en) * | 2018-04-19 | 2019-10-23 | Lakshmi Machine Works Ltd. | A piecing arm assembly for an automatic piecing apparatus and a method thereof |
-
2020
- 2020-06-03 EP EP20177969.1A patent/EP3748054B1/en active Active
- 2020-06-04 CN CN202010500745.XA patent/CN112048793B/en active Active
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CN112048793A (en) | 2020-12-08 |
EP3748054A1 (en) | 2020-12-09 |
CN112048793B (en) | 2023-05-12 |
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