EP0709502B1 - Roving joining method and device applicable to spinning machines - Google Patents
Roving joining method and device applicable to spinning machines Download PDFInfo
- Publication number
- EP0709502B1 EP0709502B1 EP95202742A EP95202742A EP0709502B1 EP 0709502 B1 EP0709502 B1 EP 0709502B1 EP 95202742 A EP95202742 A EP 95202742A EP 95202742 A EP95202742 A EP 95202742A EP 0709502 B1 EP0709502 B1 EP 0709502B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- roving
- tubular guide
- rovings
- guide element
- old
- 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.)
- Expired - Lifetime
Links
- 238000005304 joining Methods 0.000 title claims description 23
- 238000009987 spinning Methods 0.000 title claims description 13
- 238000000034 method Methods 0.000 title claims description 7
- 230000000779 depleting effect Effects 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims 1
- 230000000694 effects Effects 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000004804 winding Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007378 ring spinning Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01H—SPINNING OR TWISTING
- D01H9/00—Arrangements for replacing or removing bobbins, cores, receptacles, or completed packages at paying-out or take-up stations ; Combination of spinning-winding machine
- D01H9/005—Arrangements for replacing or removing bobbins, cores, receptacles, or completed packages at paying-out or take-up stations ; Combination of spinning-winding machine for removing empty packages or cans and replacing by completed (full) packages or cans at paying-out stations; also combined with piecing of the roving
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H69/00—Methods of, or devices for, interconnecting successive lengths of material; Knot-tying devices ;Control of the correct working of the interconnecting device
- B65H69/06—Methods of, or devices for, interconnecting successive lengths of material; Knot-tying devices ;Control of the correct working of the interconnecting device by splicing
- B65H69/061—Methods of, or devices for, interconnecting successive lengths of material; Knot-tying devices ;Control of the correct working of the interconnecting device by splicing using pneumatic means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2701/00—Handled material; Storage means
- B65H2701/30—Handled filamentary material
- B65H2701/31—Textiles threads or artificial strands of filaments
- B65H2701/311—Slivers
Definitions
- This invention relates to a roving joining method and device, applicable to spinning machines.
- D1 DE-A-3114538
- D2 DE-A-3612229
- the device disclosed in D1 has a structure that must be opened to introduce the new and the old rovings and substantially comprises a first and a second part that must be displaced in order to put the new and the old roving in contact and to join them.
- D2 provides a splicing chamber having their axes displaced from each other. The reliability and the cost of said devices are not such as to allow them to be advantageously used on a wide scale, mainly for the following reasons:
- the roving joining operation is still preferably carried out by an operator by halting the spinning unit of the machine and manually inserting the two rovings, the old and the new, simultaneously into the drafting unit and checking that the aforesaid conditions are verified.
- the joint obtained is substantially a connection between the rovings such that the operating roving is able to drag the new roving into operation, while simultaneously allowing the subsequent drafting of the rovings even if joined.
- the connection made has the merit of still allowing relative sliding between the roving fibres even at the point of joining, and which must necessarily occur to be able to effect the subsequent drafting of the roving without defects at the joint.
- the joint is only semi-effective because, even if the new roving is sufficiently wound on the old roving to be dragged into operation, to prevent further yarn defects the tail end of the old roving must also be joined.
- tail end is formed as a result of the emptying of the bobbin on which said old roving is wound (a very rare case) or by breaking said roving is indifferent.
- the operation of the second nozzle within the tubular guide element of open cross-section generates a second stream which also winds the tail end of the old roving as helical turns onto the new roving, which is substantially taut as it is in operation.
- the device for joining the tail end of the old roving onto the new roving can also be used separately from the first device if it is required only to join the roving tail end, for example because the joint between the rovings has already been previously made manually or by a device. In either case the device for joining the tail end can operate either in collaboration with a gripper device or not.
- the gripper device is synchronized with the operation of the two nozzles 4 and 5 such that the tail end of the old roving has a length suitable for winding by the second nozzle 5.
- the tail end joining device is particularly versatile.
- the first device for joining the initial end of the new roving and the second device for joining the tail end of the old roving can use one and the same tubular guide element.
- the first and second nozzle are positioned at the two ends of said guide element respectively and must be operated selectively and sequentially to prevent the jet from one interfering negatively with that from the other.
- the tubular guide element has an open cross-section mainly to allow the roving or rovings to be joined to be rapidly and easily inserted through the relative slit. Hence it is not to be excluded that a closed guide element without the said slit can equally operate satisfactorily.
- the invention is described by way of non-limiting example in terms of an embodiment which has been improved such as to comprise a single guide serving both the the joining devices. In this respect it is assumed that such an embodiment is more suitable for current requirements.
- Figure 1 shows the device mounted on a unit of the spinning machine.
- Figure 2 is a perspective view of the device.
- Figure 3 is a plan view of the device.
- Figures 4A-4E are schematic illustrations showing the device during the various stages of operation.
- the roving joining device 1 comprises a gripper device 2, a guide element 3, a first nozzle 4 and a second nozzle 5.
- the device 1 is housed on each unit (or position) of the spinning machine between the creel 6 and the drafting unit 7, which are conventional. Consequently the spinning machine comprises a number of devices equal to the number of units.
- the creel 6 is able to contain at least one depleting bobbin 8 and at least one full bobbin 9.
- the gripper device 2 comprises a movable abutment 10 and a fixed abutment 16 separated by a gap 11 between which the roving to be broken can slide.
- the guide element 3 is of tubular form with its axis 13 parallel to the axis of movement of the roving in operation.
- the element 3 is of open cross-section because of the presence of a longitudinal slit 12 through which the roving or rovings can be inserted.
- the cross-section of the element 3 is such that an air jet directed towards its interior is able to form a swirl essentially about and along the axis 13.
- the guide 3 can have any of the following shapes: a portion of a circle, a portion of an ellipse, a portion of a circumferential involute, a portion of an Archimedes spiral, or similar and/or intermediate shapes.
- the first nozzle 4 is connected to a compressed air generator (not shown) and is positioned at a first end of the tubular guide element 3 and orientated towards the interior of said guide element 3 so as to generate an air swirl extending along the entire extension of the element 3, and having a component in the direction of advancement of the roving in operation.
- the second nozzle 5 is also connected to a compressed air generator, preferably that to which the first nozzle 4 is connected, and is positioned at a second end of the tubular guide element 3 and orientated towards the interior of said guide element 3 to generate an air swirl rotating about the axis 13 and extending along the entire extension of the element 3, but with a component directed in the opposite direction to the direction of advancement of the roving in operation.
- This breakage of the old roving 14 determines the formation of the relative tail end 14A.
- the device of the invention joins the rovings together by a method comprising the following steps:
- the tail end of the old roving is also wound about the (new) roving in operation, which is taut along a rectilinear axis.
- the winding is achieved by a further air swirl rotating about the rovings and having a component in the opposite direction to the direction of advancement of the rovings in operation so as to form further helical turns.
- the tail end of the old roving can be formed either by programmed breakage of the roving or by natural depletion of the bobbin.
- the first case is however preferred because it reduces to a minimum a region which is critical as it can easily become a source of imperfection in the yarn being produced.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
- Preliminary Treatment Of Fibers (AREA)
- Spinning Methods And Devices For Manufacturing Artificial Fibers (AREA)
- Treatment Of Fiber Materials (AREA)
Description
- The end of the new roving may encounter considerable difficulty in entering the appropriate parts of the drafting device and the guides (condensers) properly to the side of the depleting (old) roving, and hence does not advance uniformly from the drafting device.
- When it abandons the first roller of the drafting device, the end of the old roving, which is now associated with the new, tends to be transported into the drafting region at the velocity of the exit roller, and hence does not undergo drafting.
- it must be sufficiently strong to enable the operating roving to drag the new roving into operation;
- it must be sufficiently weak to allow those fibres of the joined rovings which are still free to slide under the effect of the drafting force. If not, then drafting could not be achieved and the yarn size would be such as to interrupt production due to breakage.
- achieves a joint which is sufficiently strong to enable the operating roving to drag the new roving into operation, while at the same time being sufficiently weak to allow those fibres of the joined rovings which are still free to slide under the effect of the drafting force;
- Is able to make the joint while substantially reducing operator commitment;
- joins the rovings without requiring stoppage of the spinning unit;
- is of simple and reliable structure leading to particularly low constructional and operating costs.
- a first step in which the initial end of the new roving is
positioned to the side of the old roving which at that moment is
in operation and is hence taut along a rectilinear axis parallel
to or coincident with the
axis 13; - a second step in which the initial end of the new roving is wound about the old roving in operation by an air swirl which rotates about the rovings and also has a component in the direction of advancement of the roving in operation so as to form a number of helical turns sufficient to generate a level of friction such as to overcome the dragging force;
- possible breakage of the old roving;
- a third step in which the joined rovings are inserted into the drafting device.
Claims (11)
- A roving joining device (1) applicable in particular to spinning machines, whereby comprising a first device (3, 4) for joining the initial end of the new roving originating from a full bobbin (9) to the old roving originating from a depleting bobbin (8), and a second device (3, 5) for joining the tail end of the old roving to the new roving already in operation, said first device (3, 4) comprising:a first tubular guide element (3), the axis (13) of which is positioned parallel to the axis of the movement of the roving operation;a nozzle (4) feeding compressed air into the interior of said tubular guide element (3) and inclined such that the generated jet (4) has also a component in the same direction as the direction of advancement of the roving in operation;a second tubular guide element (3), the axis (13)of which is positioned parallel to the axis of the movement of the roving in operation;a second nozzle (5) feeding compressed air into the interior of said tubular guide element (3) and inclined in the opposite direction to the direction of advancement of the new roving in operation,are of the permanently open cross-section because of the presence of a longitudinal slit (12),has permanently the same axis (13).
- A device as claimed in claim 1, characterised in that the first and the second tubular guide elements (3) are connected together to form a single element (3).
- A device as claimed in claim 1 and/or 2, characterised in that the shape of the open cross section of the tubular guide element (3) is round.
- A device as claimed in claims 1 and/or 2, characterised in that the shape of the open cross-section of the tubular guide element (3) is elliptical.
- A device as claimed in claims 1 and/or 2, characterised in that the shape of the open cross-section of the tubular guide element (3) is circumferential involute.
- A device as claimed in claims 1 and/or 2, characterised in that the shape of the open cross-section of the tubular guide element (3) is an Archimedes spiral.
- A device as claimed in claim 1, characterised by comprising, for locking the depleting roving, a device (2) positioned upstream of the tubular guide element (3).
- A method for joining together at least two rovings in a spinning machine comprising:a first step in which the initial end of the new roving is positioned to the side of roving in operation which is taut along a rectilinear axis;a second step in which the initial end of the new roving is wound about the roving in operation by an air swirl which rotates about the rovings;a third step in which the joined rovings are inserted into the drafting device;a fourth step in which the tail end of the old roving is also wound about the new roving in operation, and hence taut along a rectilinear axis, by a further air swirl rotating about the rovings,
- A method as claimed in claim 8, characterised in that the tail end of the old roving is formed by the programmed breakage of the roving.
- A method as claimed in claim 8, characterised in that the tail end of the old roving is formed by natural emptying of the bobbin.
- A method for joining together at least two rovings in a spinning machine, characterised in that the tail end of the old roving is wound about the new roving in operation and hence taut along a rectilinear axis, by an air swirl rotating about the rovings and having a component in the opposite direction to the direction of advancement of the rovings in operation so as to form further helical turns.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI942192A IT1271046B (en) | 1994-10-26 | 1994-10-26 | METHOD AND DEVICE FOR THE JOINTING OF WICKS APPLICABLE TO SPINNING MACHINES |
ITMI942192 | 1994-10-26 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0709502A1 EP0709502A1 (en) | 1996-05-01 |
EP0709502B1 true EP0709502B1 (en) | 1998-07-08 |
Family
ID=11369776
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95202742A Expired - Lifetime EP0709502B1 (en) | 1994-10-26 | 1995-10-11 | Roving joining method and device applicable to spinning machines |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0709502B1 (en) |
JP (1) | JPH0931776A (en) |
DE (1) | DE69503334T2 (en) |
ES (1) | ES2117827T3 (en) |
IT (1) | IT1271046B (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ES2685400T3 (en) | 2013-03-18 | 2018-10-08 | Bobst Mex Sa | Ejection device of a flat object during transport |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5516981A (en) * | 1979-02-09 | 1980-02-06 | Murata Mach Ltd | Pneumatic ending |
DE3114538A1 (en) * | 1981-04-10 | 1983-01-13 | W. Schlafhorst & Co, 4050 Mönchengladbach | Method and apparatus for the knot-free connection of two threads |
JPS61257877A (en) * | 1985-04-12 | 1986-11-15 | Murata Mach Ltd | Ending nozzle unit |
DE3939881A1 (en) * | 1989-12-01 | 1991-06-06 | Rieter Ag Maschf | Splicing chamber - gives counter rotating airflow to twist material back after splicing to give splice same tensile strength as remainder of material |
-
1994
- 1994-10-26 IT ITMI942192A patent/IT1271046B/en active IP Right Grant
-
1995
- 1995-10-11 DE DE69503334T patent/DE69503334T2/en not_active Expired - Fee Related
- 1995-10-11 EP EP95202742A patent/EP0709502B1/en not_active Expired - Lifetime
- 1995-10-11 ES ES95202742T patent/ES2117827T3/en not_active Expired - Lifetime
- 1995-10-24 JP JP7275942A patent/JPH0931776A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
ITMI942192A0 (en) | 1994-10-26 |
DE69503334D1 (en) | 1998-08-13 |
ITMI942192A1 (en) | 1996-04-26 |
ES2117827T3 (en) | 1998-08-16 |
DE69503334T2 (en) | 1998-12-17 |
JPH0931776A (en) | 1997-02-04 |
IT1271046B (en) | 1997-05-26 |
EP0709502A1 (en) | 1996-05-01 |
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