EP0290063B1 - Picking element for carrying out the operation of bobbin doffing and the operation of introduction of the empty tube on a spinning frame - Google Patents
Picking element for carrying out the operation of bobbin doffing and the operation of introduction of the empty tube on a spinning frame Download PDFInfo
- Publication number
- EP0290063B1 EP0290063B1 EP88200602A EP88200602A EP0290063B1 EP 0290063 B1 EP0290063 B1 EP 0290063B1 EP 88200602 A EP88200602 A EP 88200602A EP 88200602 A EP88200602 A EP 88200602A EP 0290063 B1 EP0290063 B1 EP 0290063B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- picking element
- picking
- doffing
- pin
- sleeve portion
- 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
- 238000009987 spinning Methods 0.000 title claims description 6
- 239000012530 fluid Substances 0.000 claims description 7
- 238000010079 rubber tapping Methods 0.000 claims description 4
- 230000003287 optical effect Effects 0.000 claims description 2
- 239000004753 textile Substances 0.000 claims description 2
- 230000011664 signaling Effects 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000005266 casting Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000000717 retained effect Effects 0.000 description 1
- 238000004804 winding Methods 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
- D01H9/001—Bobbin-taking arrangements
Definitions
- the present invention relates to a gripping device for the automatic doffing of bobbins and replacing of empty tubes on a textile machine, preferably a spinning frame.
- Devices for carrying out the operation of bobbin doffing and the operation of placing empty winding tubes on spindles are provided with picking elements for gripping and handling the empty tubes or the tubes filled with wound thread.
- picking elements are mounted on a longitudinal beam, in a cantilever fashion, to which beam the necessary movement is supplied, for simultaneously picking all the complete bobbins from the spindles, and, according to a suitable sequence, for simultaneously positioning all the empty tubes on the spindles.
- Picking elements are known, which are based on the use of bushes containing elastically yielding inner sleeves which, under the action of a pressurized fluid, are inflated in order to be able to grip the full bobbins, or the empty tubes.
- the picking elements destined to the automatic doffing of all the full bobbins, and those destined to the re-charge of all the empty tubes of the whole spinning bed are generally separated from one another, and are provided with well-distinct drive means.
- picking elements are known.
- a structural type of picking elements for empty tubes, or tubes filled with thread is disclosed in detail in US-A-3,367,098.
- the picking element has a pin shape, and has an elastic-bellows body having the shape of a bag which presses, after being inflated, against the inner wall of the tube to be gripped, and in such a way grips and moves it.
- This type of picking element makes some drawbacks arise, which limit its application.
- the inclination is such that, as the movements for the automatic doffing operation proceed, the empty tube, or the tube filled with thread beats against parts of the machine, which damage it, and, in extreme cases, also a damage may occur to the picking element, or to corresponding machine parts against which the same tube comes to interfere.
- the purpose of the present invention is to render only one the picking element destined to grip the tubes and the bobbins (i.e., those tubes on which desired amounts of thread have been wound) and, furthermore, to considerably simplify the manufacturing operations thereof.
- a gripping device having a picking element capable of gripping both empty tubes and complete bobbins is further known from GB-A-2 118 523.
- This device comprises a single picking element for each gripping station and has the features of the preamble of claim 1.
- Both the sleeve portion of the picking element and the elastically yielding sleeve member have a bell-shaped configuration, and they are both fastened at their top portion to the doffing beam by means of a screw screwed into the body of the beam, the screw thus extending coaxially to the picking element and the tube or bobbin to be gripped thereby.
- this known picking element is made of a relatively high number of mutually assembled components, and this increases the manufacturing costs.
- the purpose of the present invention is to provide a picking element with a considerably reduced cost and which reacts and triggers a safety action when the movement which the picking element is expected to carry out is hindered during the change in position of the empty tube, or of the tube filled with wound thread.
- Each action of detaching of the picking element from the longitudinal support beam may be simultaneously signalized by an optical or acoustical signal, so that the attention of the attending staff is drawn onto the operative malfunctioning, and the attending staff may eliminate it with no delay, in order to restore the optimum conditions for carrying out the whole automatic doffing operation.
- the safety element may advantageously have the structure of a self-tapping screw, which connects the longitudinal support beam with a pin suitably housed in a hole of the picking element.
- Said pin is provided, through its middle, with a smooth bore, which is self-tapped under the action of the self-tapping screw.
- the self-thread generated by the screw in the pin is in fact the actual safety element, in that it results to have a limited, preset, strength, on a value preset during the design step.
- the handling integrity is restored by simply replacing the pin provided with said smooth bore, which gets self-tapped during the action of screw connection, as above disclosed. Incidentally, the functionality of the picking element is restored without it having to be replaced.
- a picking element 1 has a rigid sleeve portion 2 (e.g., of a plastics material) housing an elastically yielding sleeve member 10 secured at its opposite ends to the sleeve portion 2.
- the picking element 1 is a single-piece element further having a bracket portion 2a extending generally radially to the sleeve portion 2 for cantilever supporting the picking element 1 by a longitudinal doffing beam 4, supporting all the picking elements 1 of the whole operating bed, which associates the spinning spindles in an approached position side-by-side to each other.
- a ring space 5 suitable for introducing a compressed fluid for inflating the elastically yielding sleeve member 10 surrounds the sleeve member 10 in the sleeve portion 2.
- a rigid ring 6 serves for positioning the bottom lip of the elastical sleeve member 10 for the single high-pressure mould-casting operation during which the picking element 1 is manufactured.
- a channel 8 places the ring space 5 in fluid communication with a central feed duct 9 of the beam 4, so that a compressed fluid supplied to the duct 9 feeds all the picking elements 1 of the whole operating bed through the respective channels 8.
- the compressed fluid causes the elastically yielding inner sleeve member 10 to be inflated in order to grip the top end portion of an empty tube, or of a tube filled with the wound thread (i.e. a bobbin).
- the sleeve portion 2 has two wings 12 integral therewith, which have the shape of two circular sectors forming a divergent funnel extending downwards for inviting and guiding the picking element 1 on the outer portion of the top end of the tube or bobbin to be handled during the automatic doffing operating cycle.
- a safety element in form of a pin 14 is interposed between the bracket portion 2a and a fastening means in form of a screw 16 securing the picking element to the doffing beam 4.
- the pin 14 is housed in a hole 3 of the bracket portion 2a.
- the hole 3 extends perpendicularly to the axis of the sleeve portion 2a of the picking element 1.
- the pin 14 is further provided, substantially through its middle, with a smooth bore wherein the screw 16, which is a self-tapping screw, is screwed, so generating a screw-thread inside the bore of the pin 14 and binding the picking element 1 to the beam 4.
- the automatic doffing device is positioned in such a way that the beam 4 positions the picking element 1 around the portions close to the top end of said either empty or thread-filled tube, and electrovalves, or similar means are then operated, which deliver compressed air to the main duct 9. Then, through the communication channel 8, compressed air is fed to the ring space 5, which causes the deformation of the elastically yielding member 10 to occur, causing the empty tube, or the tube filled with wound thread, to be gripped thereby.
- the subsequent handling causes either the doffing of the tube filled with wound thread from the spinning spindle, or the bringing of the empty tube in place of the already removed tube filled with wound thread, the whole according to a precise sequence of operating steps known from the prior art.
- the calibrated strength connection formed by the pin 14 in which the screw 16 is self-tapped causes the picking element 1 to get detached from the beam 4, whereas the beam itself can continue its operating movement with all the other picking elements 1 fastened thereto and without that parts of the machine or of the doffing device and picking element other than the pin 14 are damaged.
- the pin 14 can subsequently be easily replaced.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Spinning Or Twisting Of Yarns (AREA)
- Replacing, Conveying, And Pick-Finding For Filamentary Materials (AREA)
Description
- The present invention relates to a gripping device for the automatic doffing of bobbins and replacing of empty tubes on a textile machine, preferably a spinning frame.
- Devices for carrying out the operation of bobbin doffing and the operation of placing empty winding tubes on spindles are provided with picking elements for gripping and handling the empty tubes or the tubes filled with wound thread. Such picking elements are mounted on a longitudinal beam, in a cantilever fashion, to which beam the necessary movement is supplied, for simultaneously picking all the complete bobbins from the spindles, and, according to a suitable sequence, for simultaneously positioning all the empty tubes on the spindles.
- Picking elements are known, which are based on the use of bushes containing elastically yielding inner sleeves which, under the action of a pressurized fluid, are inflated in order to be able to grip the full bobbins, or the empty tubes.
- The picking elements destined to the automatic doffing of all the full bobbins, and those destined to the re-charge of all the empty tubes of the whole spinning bed are generally separated from one another, and are provided with well-distinct drive means.
- However, other structural forms of picking elements are known. A structural type of picking elements for empty tubes, or tubes filled with thread, is disclosed in detail in US-A-3,367,098. In said patent, the picking element has a pin shape, and has an elastic-bellows body having the shape of a bag which presses, after being inflated, against the inner wall of the tube to be gripped, and in such a way grips and moves it. This type of picking element makes some drawbacks arise, which limit its application. These drawbacks are represented, in particular, by the non-universal nature of said picking element, in that some tubes have at their top end a limited-size bore, for advantageously providing a reinforcer rim, or, in extreme cases, the bore top end is closed by means of a plug, also used for reinforcement purposes.
- Another drawback occurs whenever the pin-shaped picking element has to operate in connection with tubes whose top rim is damaged. In these cases, the empty tube, or the tube filled with wound thread (the bobbin), retained and gripped by the pin-shaped picking element, positions itself in an inclined position relatively to the longitudinal axis of the spindles, thus creating unfavourable conditions for reaching, in a correct position, the position provided for by the spindle, or supporting pin. That may cause unfavourable conditions for a correct support positioning on the spindle, or on the supporting pin. Sometimes the inclination is such that, as the movements for the automatic doffing operation proceed, the empty tube, or the tube filled with thread beats against parts of the machine, which damage it, and, in extreme cases, also a damage may occur to the picking element, or to corresponding machine parts against which the same tube comes to interfere.
- However, still other structural forms are known for the picking elements destined to the doffing of the tubes filled with wound thread, and to the re-charge of the empty tubes.
- In the past, devices for the automatic doffing have been developed, wherein the picking element destined to the doffing of the tubes filled with wound thread and the picking element destined to the re-charge of the empty tubes are combined with each other in a single base rigid sleeve, as disclosed in IT-U-156,780 or FR-A-2 182 870.
- These picking elements, together with some advantageous characteristics, like their relatively small overall dimensions and the simplicity of the operating cycle within the scope of the double-gripping device, suffer from some drawbacks, which complicate their manufacturing and assemblage steps and which consequently cause a considerable increase in their manufacturing costs. These drawbacks are mainly represented by the presence of two picking elements, which determine a double fastening, and which are manufactured with a plurality of mechanical elements associated with, and fastened to, one another, by means of assemblage operations, of a considerable overall cost.
- In fact, in order to produce such picking elements, an operation of folding and clamping must be carried out in order to bind the elastic sleeves and the rigid sleeves at the ends of the two picking elements by snap-applying metal rings to the end edges, as well as assemblage operations have to be carried out in order to house ring gaskets inside the rigid sleeves, and still other operations have to be performed; furthermore, the feed of compressed air (or of another pressurized fluid), to feed the expandible chambers of the picking elements, takes place through separated ducts, each of said separated ducts being prearranged in order to feed bores and slots relevant to each elastically yielding sleeve; all the above contribute to increase the end cost of these double-gripping devices.
- On considering the above, the purpose of the present invention is to render only one the picking element destined to grip the tubes and the bobbins (i.e., those tubes on which desired amounts of thread have been wound) and, furthermore, to considerably simplify the manufacturing operations thereof.
- A gripping device having a picking element capable of gripping both empty tubes and complete bobbins is further known from GB-A-2 118 523. This device comprises a single picking element for each gripping station and has the features of the preamble of claim 1.
- Both the sleeve portion of the picking element and the elastically yielding sleeve member have a bell-shaped configuration, and they are both fastened at their top portion to the doffing beam by means of a screw screwed into the body of the beam, the screw thus extending coaxially to the picking element and the tube or bobbin to be gripped thereby.
- Such a construction has the main drawback that when the movement of the beam with the picking element is hindered, especially on depositing incorrectly aligned tubes on the spindles, considerable forces act onto the interfering elements which can damage the picking element or parts of the gripping device or of the machine owing to the axial compression of these members between the spindles and the beam.
- Furthermore, this known picking element is made of a relatively high number of mutually assembled components, and this increases the manufacturing costs.
- Summing-up, the purpose of the present invention is to provide a picking element with a considerably reduced cost and which reacts and triggers a safety action when the movement which the picking element is expected to carry out is hindered during the change in position of the empty tube, or of the tube filled with wound thread.
- This purpose is achieved by a gripping device as claimed in the characterizing portion of claim 1.
- With a device according to the present invention, it becomes possible to prevent, even to a practically complete extent, any possible risks of damage to parts or elements of the automatic doffing device, or to machine parts, or the like, in a substantially better way than it was heretofore possible.
- Each action of detaching of the picking element from the longitudinal support beam may be simultaneously signalized by an optical or acoustical signal, so that the attention of the attending staff is drawn onto the operative malfunctioning, and the attending staff may eliminate it with no delay, in order to restore the optimum conditions for carrying out the whole automatic doffing operation.
- In particular, the safety element, owing to cost reasons, may advantageously have the structure of a self-tapping screw, which connects the longitudinal support beam with a pin suitably housed in a hole of the picking element.
- Said pin is provided, through its middle, with a smooth bore, which is self-tapped under the action of the self-tapping screw.
- The self-thread generated by the screw in the pin is in fact the actual safety element, in that it results to have a limited, preset, strength, on a value preset during the design step.
- In case the safety action is performed - which derives from a previously unexpected resistance due to an impact, or to a casual interference, and which causes the picking element to get detached from the longitudinal support beam -, the handling integrity is restored by simply replacing the pin provided with said smooth bore, which gets self-tapped during the action of screw connection, as above disclosed. Incidentally, the functionality of the picking element is restored without it having to be replaced.
- The invention is now explained in the following in greater detail, on the base of an example of practical embodiment shown in the figures of the hereto attached single drawing sheet, it being understood, in this connection, that the invention can be practiced according to many further forms of practical embodiment.
- In the drawing:
- Figure 1 shows a schematic cross-section of a picking element fastened to a longitudinal doffing beam according to the present invention;
- Figure 2 shows a schematic view, in axonometric perspective, of the picking element together with the longitudinal beam.
- The operation of some elements which operate in mutual cooperation with the picking elements in the automatic doffing device is not described in detail, because such elements are already known, and also because they do not concern the improvement according to the present invention.
- Referring to the drawing, a picking element 1 has a rigid sleeve portion 2 (e.g., of a plastics material) housing an elastically yielding
sleeve member 10 secured at its opposite ends to thesleeve portion 2. The picking element 1 is a single-piece element further having abracket portion 2a extending generally radially to thesleeve portion 2 for cantilever supporting the picking element 1 by alongitudinal doffing beam 4, supporting all the picking elements 1 of the whole operating bed, which associates the spinning spindles in an approached position side-by-side to each other. Aring space 5 suitable for introducing a compressed fluid for inflating the elastically yieldingsleeve member 10 surrounds thesleeve member 10 in thesleeve portion 2. Arigid ring 6 serves for positioning the bottom lip of theelastical sleeve member 10 for the single high-pressure mould-casting operation during which the picking element 1 is manufactured. A channel 8 places thering space 5 in fluid communication with acentral feed duct 9 of thebeam 4, so that a compressed fluid supplied to theduct 9 feeds all the picking elements 1 of the whole operating bed through the respective channels 8. The compressed fluid causes the elastically yieldinginner sleeve member 10 to be inflated in order to grip the top end portion of an empty tube, or of a tube filled with the wound thread (i.e. a bobbin). - The
sleeve portion 2 has twowings 12 integral therewith, which have the shape of two circular sectors forming a divergent funnel extending downwards for inviting and guiding the picking element 1 on the outer portion of the top end of the tube or bobbin to be handled during the automatic doffing operating cycle. A safety element in form of apin 14 is interposed between thebracket portion 2a and a fastening means in form of ascrew 16 securing the picking element to thedoffing beam 4. Thepin 14 is housed in ahole 3 of thebracket portion 2a. Thehole 3 extends perpendicularly to the axis of thesleeve portion 2a of the picking element 1. Thepin 14 is further provided, substantially through its middle, with a smooth bore wherein thescrew 16, which is a self-tapping screw, is screwed, so generating a screw-thread inside the bore of thepin 14 and binding the picking element 1 to thebeam 4. - If gripping and handling an empty tube, or a tube filled with wound thread, is desired, first of all the automatic doffing device is positioned in such a way that the
beam 4 positions the picking element 1 around the portions close to the top end of said either empty or thread-filled tube, and electrovalves, or similar means are then operated, which deliver compressed air to themain duct 9. Then, through the communication channel 8, compressed air is fed to thering space 5, which causes the deformation of the elastically yieldingmember 10 to occur, causing the empty tube, or the tube filled with wound thread, to be gripped thereby. The subsequent handling causes either the doffing of the tube filled with wound thread from the spinning spindle, or the bringing of the empty tube in place of the already removed tube filled with wound thread, the whole according to a precise sequence of operating steps known from the prior art. - If the picking element 1 encounters any hindrance to its movement with the
doffing beam 4, the calibrated strength connection formed by thepin 14 in which thescrew 16 is self-tapped, causes the picking element 1 to get detached from thebeam 4, whereas the beam itself can continue its operating movement with all the other picking elements 1 fastened thereto and without that parts of the machine or of the doffing device and picking element other than thepin 14 are damaged. Thepin 14 can subsequently be easily replaced.
Claims (4)
- A gripping device for automatically doffing bobbins and replacing empty tubes on a textile machine, particularly a spinning frame, comprising a picking element (1) having a sleeve portion (2) for receiving therein an end of a bobbin or tube, an elastically yielding sleeve member (10) housed inside the sleeve portion (2) and secured thereto at opposite ends, an annular space (5) surrounding the sleeve member (10) in the sleeve portion (2), a channel (8) in the picking element (1) providing fluid communication between said annular space (5) and a feed duct of a doffing beam (4), and screw means (16) for fastening the picking element (1) onto the doffing beam (4), characterised in that the picking element (1) is a single-piece element having a bracket portion (2a) extending generally radially from the sleeve portion (2) for cantilever supporting the picking element (1) by the doffing beam (4), and in that a safety element (14) with a preset limited strength is interposed between said bracket portion (2a) and said fastening screw means (16), whereby the picking element (1) gets detached from the doffing beam (4) when the movement of the picking element (1) with the beam (4) is hindered.
- A gripping device according to claim 1, characterised in that said safety element comprises a pin (14) within a hole (3) of said bracket portion (2a) and in that said fastening screw means comprise a self-tapping screw (16) screwed into a bore of said pin (14).
- A gripping device according to claims 1 and 2, characterised in that said hole (3) and said pin (14) extend substantially perpendicularly to the axis of said sleeve portion (2).
- A gripping device according to claim 1, characterised in that it further comprises an optical or acoustical signalling device associated to the picking element (1) for signalling detachment of the picking element (1) from the doffing beam (4).
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT2042787 | 1987-05-08 | ||
IT20427/87A IT1205005B (en) | 1987-05-08 | 1987-05-08 | GRIPPING ELEMENT TO CARRY OUT THE LEVEL OPERATION OF THE COIL AND THAT OF INTRODUCTION OF THE EMPTY TUBE IN A SPINNING MACHINE |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0290063A1 EP0290063A1 (en) | 1988-11-09 |
EP0290063B1 true EP0290063B1 (en) | 1992-10-21 |
Family
ID=11166788
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP88200602A Expired - Lifetime EP0290063B1 (en) | 1987-05-08 | 1988-03-30 | Picking element for carrying out the operation of bobbin doffing and the operation of introduction of the empty tube on a spinning frame |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0290063B1 (en) |
DE (1) | DE3875371T2 (en) |
ES (1) | ES2036663T3 (en) |
GR (1) | GR3006121T3 (en) |
IT (1) | IT1205005B (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1249023B (en) * | 1990-06-29 | 1995-02-11 | Savio Spa | DEVICE FOR LOADING TUBES ORIENTED IN SEQUENCE TO THE LEAVING BELT OF A THREADING MACHINE |
US5289674A (en) * | 1990-06-29 | 1994-03-01 | Savio | Winding machine with an in-line package preparer, and an improved spinning-winding method |
IT1249025B (en) * | 1990-06-29 | 1995-02-11 | Savio Spa | DEVICE FOR THE SEQUENTIAL LOADING OF TUBES ADJUSTABLE TO A THREADING MACHINE |
DE4117730A1 (en) * | 1991-05-30 | 1992-12-03 | Zinser Textilmaschinen Gmbh | METHOD FOR REMOVING COILS AND FOR PLACING COIL SEALS ON SPINDLES ON A MACHINE SIDE OF A SPINDING OR TWINING MACHINE, AND DEVICE FOR CARRYING OUT THE METHOD |
CN113896048B (en) * | 2021-12-10 | 2022-02-08 | 新沂利业织造有限公司 | Automatic grabbing device of a circular cone yarn section of thick bamboo |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2309754A1 (en) * | 1972-03-16 | 1973-09-27 | Nuova San Giorgio Spa | GRIPPING DEVICE FOR REMOVING FULL SPOOLS AND REPLACING THE EMPTY CASES IN A SPINNING MACHINE |
FR2466534A1 (en) * | 1979-09-28 | 1981-04-10 | Alsacienne Constr Meca | DEVICE FOR GRIPPING WIRE SUPPORTS ON TEXTILE MACHINES WITH ROTARY PINS |
DE3214128C2 (en) * | 1982-04-16 | 1984-11-15 | Schubert & Salzer Maschinenfabrik Ag, 8070 Ingolstadt | Pneumatic gripper |
-
1987
- 1987-05-08 IT IT20427/87A patent/IT1205005B/en active
-
1988
- 1988-03-30 ES ES198888200602T patent/ES2036663T3/en not_active Expired - Lifetime
- 1988-03-30 DE DE8888200602T patent/DE3875371T2/en not_active Expired - Fee Related
- 1988-03-30 EP EP88200602A patent/EP0290063B1/en not_active Expired - Lifetime
-
1992
- 1992-10-30 GR GR920402448T patent/GR3006121T3/el unknown
Also Published As
Publication number | Publication date |
---|---|
GR3006121T3 (en) | 1993-06-21 |
ES2036663T3 (en) | 1993-06-01 |
EP0290063A1 (en) | 1988-11-09 |
IT1205005B (en) | 1989-03-10 |
DE3875371D1 (en) | 1992-11-26 |
DE3875371T2 (en) | 1993-04-08 |
IT8720427A0 (en) | 1987-05-08 |
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