EP3945150A1 - Accumulation yarn feeder provided with a spacer device for separating the loops of yarn wound on the drum - Google Patents
Accumulation yarn feeder provided with a spacer device for separating the loops of yarn wound on the drum Download PDFInfo
- Publication number
- EP3945150A1 EP3945150A1 EP21176649.8A EP21176649A EP3945150A1 EP 3945150 A1 EP3945150 A1 EP 3945150A1 EP 21176649 A EP21176649 A EP 21176649A EP 3945150 A1 EP3945150 A1 EP 3945150A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drum
- rotational coupling
- yarn feeder
- feeder according
- fingers
- 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.)
- Granted
Links
- 125000006850 spacer group Chemical group 0.000 title claims abstract description 13
- 238000009825 accumulation Methods 0.000 title claims description 22
- 238000004804 winding Methods 0.000 claims abstract description 4
- 230000008878 coupling Effects 0.000 claims description 20
- 238000010168 coupling process Methods 0.000 claims description 20
- 238000005859 coupling reaction Methods 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 3
- 230000000750 progressive effect Effects 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 description 4
- 239000004753 textile Substances 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 230000000670 limiting effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000004073 vulcanization Methods 0.000 description 2
- YACLQRRMGMJLJV-UHFFFAOYSA-N chloroprene Chemical compound ClC(=C)C=C YACLQRRMGMJLJV-UHFFFAOYSA-N 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920001084 poly(chloroprene) Polymers 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D03—WEAVING
- D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
- D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
- D03D47/34—Handling the weft between bulk storage and weft-inserting means
- D03D47/36—Measuring and cutting the weft
- D03D47/361—Drum-type weft feeding devices
-
- D—TEXTILES; PAPER
- D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
- D04B—KNITTING
- D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
- D04B15/38—Devices for supplying, feeding, or guiding threads to needles
- D04B15/48—Thread-feeding devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H51/00—Forwarding filamentary material
- B65H51/20—Devices for temporarily storing filamentary material during forwarding, e.g. for buffer storage
- B65H51/22—Reels or cages, e.g. cylindrical, with storing and forwarding surfaces provided by rollers or bars
-
- 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
Definitions
- the present invention relates to an accumulation yarn feeder provided with a spacer device for separating the loops of yarn wound on the drum.
- a yarn feeder of the so-called "accumulation" type can comprise a drum on which multiple loops of yarn forming a reserve are wound. The loops of yarn unwind from the drum by being drawn by a generic downstream textile machine.
- a motorized flywheel which is coaxial to the drum winds new yarn taken from an upstream supply spool on said drum.
- the yarn feeder can be provided with a spacer device that has the purpose of keeping the loops of yarn wound on the drum mutually and evenly spaced, so as to ensure a smooth and regular unwinding of the yarn from the drum, also as a function of the tension control to which the yarn exiting said drum is subjected.
- the spacer device can comprise a hub, which is fitted freely on the driving shaft that turns the flywheel and supports a series of fingers which are extended in a substantially longitudinal direction with respect to the axis of the hub and are inserted in respective longitudinal slits provided on the drum.
- At least one rolling bearing and a bush integral with the driving shaft are interposed between the hub and the driving shaft.
- the bush has an external cylindrical surface that has an axis that is oblique with respect to the axis of the driving shaft and is engaged by the internal ring of the bearing.
- the fingers perform an oscillating motion which has a longitudinal component, which produces the progressive advancement of the loops of yarn as they are wound onto the drum.
- said fingers are connected to the drum by means of a partially yielding joint.
- the joint has a central tubular portion made of rubber with a corrugated wall, and two annular elements made of rigid plastic material which are integral with the opposite axial ends of the central tubular portion.
- the joint is fixed respectively to the ends of the fingers and to the drum.
- the two annular elements are vulcanized on the central tubular portion.
- the aim of the present invention is to provide an accumulation yarn feeder provided with a spacer device adapted to separate the loops of yarn wound on the drum which, with respect to the known systems cited above, is cheaper to manufacture but equally easy to assemble in the drum of the feeder.
- a generic accumulation yarn feeder 10 comprises a hollow drum 12, which is adapted to carry a variety of yarn loops (not shown) that form a reserve wound thereon.
- the yarn is adapted to unwind from the drum 12 when drawn by a generic downstream textile machine (not shown).
- a weft braking device 14 which controls its mechanical tension.
- the weft braking device 14, which is not part of the aim and objects of the present invention, can be of the conventional type and therefore it will not be described herein in detail.
- winding means which in this embodiment comprise a motorized flywheel 16, wind on the drum 12new yarn taken from an upstream supply spool (not shown).
- the flywheel 16 rotates coaxially to the drum 12 under the actuation of a motor 18.
- the yarn feeder 10 is provided with a spacer device 20 the purpose of which is to keep the loops of yarn wound on the drum 12 mutually regularly spaced, so as to ensure a smooth and regular unwinding of the yarn from the drum 12, also as a function of the tension control to which the yarn is subjected by the weft braking device 14.
- the spacer device 20 can comprise a hub 22 from which a series of spokes 24, for example, five mutually angularly equidistant spokes 24, protrudes radially.
- the spokes 24 support respective fingers 26 at their external ends, which extend in a substantially longitudinal direction with respect to the axis of the hub.
- the hub 22 is fitted freely on the driving shaft 30 that turns the flywheel 16, with the fingers 26 inserted in respective longitudinal slits 28 provided on the drum 12.
- the fingers 26 are rendered integral in rotation with the drum 12 in the manner that will be described in detail hereinafter.
- At least one rolling bearing - two bearings 31 in this embodiment ( Figure 4 ) - and a bush 32 ( Figure 3 ) keyed on the driving shaft 30 are interposed between the hub 22 and the driving shaft 30.
- the bush 32 has an external cylindrical surface, which is engaged by the internal rings of the rolling bearings 31, that has an axis that is oblique with respect to the axis of the driving shaft 30.
- the fingers 26 are connected to the drum 12 by a joint 33 which is configured to prevent the rotation of the fingers 26 around the axis of the drum 12 and at the same time allow said oscillating motion.
- the joint 33 comprises a hollow body 34 which is formed in one piece and has an internal annular portion 36 provided with a series of first internal longitudinal slots 38 which engage, in a per se axially free manner, corresponding longitudinal protrusions 58 which are integral with the drum 12, so as to render the internal annular portion 36 integral in rotation with the drum 12, an external annular portion 40 provided with a series of external longitudinal slots 42 which engage, in a per se axially free manner, corresponding longitudinal ribs 46 provided on the fingers 26, so as to render the external annular portion integral in rotation with the fingers 26, and an intermediate portion 48 which is yielding in a longitudinal direction and is substantially rigid in torsion.
- the internal annular portion 36 is axially blocked with respect to the drum 12 and, for this purpose, it is sandwiched, by clamping means which will be described in greater detail hereinafter, between an abutment 50 that is integral with the drum 12 and a flange 54.
- the abutment 50 has a substantially tubular profile, is accommodated coaxially inside the drum 12, and has a series of second internal longitudinal slots 52 ( Figure 3 ) aligned with the first ones; the longitudinal protrusions 58 being provided on a tubular extension 56 of the flange 54 and engaging both the first internal longitudinal slots 38 and the second internal longitudinal slots 52.
- the hollow body 34 is made of a material that can flex elastically, advantageously neoprene or chloroprene.
- the intermediate portion 48 preferably has a thin-walled profile extending in a radial direction, and at least one corrugation in order to ensure suitable yielding in a longitudinal direction.
- the external longitudinal slots 42 are provided on respective radial protrusions 57 which extend monolithically outward from the external annular portion 40.
- the flange 54 has an outer flat portion 54a and an inner conical portion 54b which engages externally a corresponding bevel 59 provided on the internal tubular portion 36.
- the clamping means comprise a bushing 60 which is threaded internally ( Figure 4 ), is accommodated in the abutment 50 and is integral therewith, and a first screw 62 which is inserted in the flange 54 and is screwed to one end of the bushing 60.
- a screw provided with a conical head is used in order to engage the conical portion 54b of the flange 54 to ensure correct centering.
- the abutment 50 is fixed to a front wall 12a of the drum 12 by means of a second screw 64 which is provided with a knob 66 for manual tightening.
- the second screw 64 is inserted in the front wall 12a and is screwed to the opposite end of the bushing 60 with respect to the first screw 62.
- the external tubular portion 40 of the hollow body 34 is delimited axially between a first flat end surface 40a which faces the hub 22 and a second flat end surface 40b which faces the front wall 12a of the drum 12.
- the first flat end surface 40a has an annular groove 68 which engages, for centering purposes, a corresponding annular lip 22a which extends axially from the end of the hub 22.
- the abutment 50 has an appendage 70 for supporting sensors and any other accessory devices that lie outside the aim and objects of the present invention.
- the hollow body 22 prevents the rotation of the hub 22 and of the fingers 26 with respect to the drum 12 but, by deforming in the region of the intermediate portion 48, allows the above mentioned oscillating motion.
- the assembly of the spacer device 20, and particularly of the joint 33, in the drum 12 is very easy.
- the hollow body 34 can be fixed to the abutment 50 by means of the flange 54 and the first screw 62.
- the drum can be fixed to the body of the feeder 10.
- the manufacture of the joint according to the invention does not require particular treatments and therefore is much cheaper than known solutions, which are based on vulcanization treatments.
- FIG. 5 shows a further embodiment of the invention, in which elements similar or identical to those of the previous embodiment are designated by the same reference numeral increased by 100.
- this embodiment differs from the preceding one in that the longitudinal protrusions 158, which engage the first internal longitudinal slots 138 of the internal annular portion 136 of the hollow body 134, are provided on a tubular extension 156 which is integral with the abutment 150, and the internal annular portion 136 is sandwiched between the abutment 150 and a washer 154, which takes the place of the flange of the previous embodiment, by virtue of a screw 162 screwed on the tubular extension 156.
- the longitudinal slots which acts as rotational coupling surfaces
- the longitudinal protrusions and the longitudinal ribs which act as rotational coupling counter-surfaces
- the rotational coupling may be provided differently, for example, by engagement between polygonal surfaces.
- the mechanism that produces the oscillation of the fingers lies completely outside the aim and objects of the present invention and may be provided differently from what is described here and illustrated by way of example, for example, with systems based on cams or on articulated levers.
- the shape of the hollow body 34 also may be modified within the limits of what is claimed.
- the intermediate portion could be extended in an axial direction instead of radially as in the example described herein, and/or it might have a greater number of corrugations.
Landscapes
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Forwarding And Storing Of Filamentary Material (AREA)
Abstract
Description
- The present invention relates to an accumulation yarn feeder provided with a spacer device for separating the loops of yarn wound on the drum.
- As is known, a yarn feeder of the so-called "accumulation" type can comprise a drum on which multiple loops of yarn forming a reserve are wound. The loops of yarn unwind from the drum by being drawn by a generic downstream textile machine.
- As the drum empties, a motorized flywheel which is coaxial to the drum winds new yarn taken from an upstream supply spool on said drum.
- As is known, the yarn feeder can be provided with a spacer device that has the purpose of keeping the loops of yarn wound on the drum mutually and evenly spaced, so as to ensure a smooth and regular unwinding of the yarn from the drum, also as a function of the tension control to which the yarn exiting said drum is subjected.
- In a per se known manner, for example, from
EP 0829442 B1 , the spacer device can comprise a hub, which is fitted freely on the driving shaft that turns the flywheel and supports a series of fingers which are extended in a substantially longitudinal direction with respect to the axis of the hub and are inserted in respective longitudinal slits provided on the drum. - At least one rolling bearing and a bush integral with the driving shaft are interposed between the hub and the driving shaft. The bush has an external cylindrical surface that has an axis that is oblique with respect to the axis of the driving shaft and is engaged by the internal ring of the bearing.
- As a result of the engagement of the hub with the bush, the fingers perform an oscillating motion which has a longitudinal component, which produces the progressive advancement of the loops of yarn as they are wound onto the drum.
- In order to block the rotation of the hub with respect to the drum and, at the same time, allow said oscillating motion of the fingers, said fingers are connected to the drum by means of a partially yielding joint.
- In a known embodiment, the joint has a central tubular portion made of rubber with a corrugated wall, and two annular elements made of rigid plastic material which are integral with the opposite axial ends of the central tubular portion. By means of the two annular elements, the joint is fixed respectively to the ends of the fingers and to the drum.
- In known solutions, the two annular elements are vulcanized on the central tubular portion.
- As is known, this solution is appreciated because it greatly facilitates the assembly of the spacer device inside the drum, but it has the drawback that the treatments to which the annular elements must be subjected, as well as the subsequent vulcanization process, are relatively expensive.
- Therefore, the aim of the present invention is to provide an accumulation yarn feeder provided with a spacer device adapted to separate the loops of yarn wound on the drum which, with respect to the known systems cited above, is cheaper to manufacture but equally easy to assemble in the drum of the feeder.
- This aim and other objects which will become better apparent from the following description are achieved by a yarn feeder having the characteristics described in claim 1, while the dependent claims define other advantageous characteristics of the invention.
- The invention will be now described in greater detail, with reference to some preferred but not exclusive embodiments thereof, illustrated by way of non-limiting example in the accompanying drawings, wherein:
-
Figure 1 is a perspective view of an accumulation yarn feeder of the type to which the present invention relates; -
Figure 2 is an exploded perspective view of an end portion of the accumulation yarn feeder ofFigure 1 , in which a spacer device according to the invention is incorporated; -
Figure 3 is an exploded perspective view showing separately the spacer device ofFigure 2 ; -
Figure 4 is an axial sectional view of the end portion ofFigure 2 ; -
Figure 5 is a view similar toFigure 3 , showing a further embodiment of the invention. - With initial reference to
Figure 1 , a genericaccumulation yarn feeder 10 comprises ahollow drum 12, which is adapted to carry a variety of yarn loops (not shown) that form a reserve wound thereon. The yarn is adapted to unwind from thedrum 12 when drawn by a generic downstream textile machine (not shown). In a per se known manner, before being transferred to the textile machine, the yarn being unwound from thedrum 12 passes through aweft braking device 14 which controls its mechanical tension. Theweft braking device 14, which is not part of the aim and objects of the present invention, can be of the conventional type and therefore it will not be described herein in detail. - As the
drum 12 empties, per se known winding means, which in this embodiment comprise a motorizedflywheel 16, wind on the drum 12new yarn taken from an upstream supply spool (not shown). Theflywheel 16 rotates coaxially to thedrum 12 under the actuation of amotor 18. - The
yarn feeder 10 is provided with aspacer device 20 the purpose of which is to keep the loops of yarn wound on thedrum 12 mutually regularly spaced, so as to ensure a smooth and regular unwinding of the yarn from thedrum 12, also as a function of the tension control to which the yarn is subjected by theweft braking device 14. - In a per se known manner, the
spacer device 20 can comprise ahub 22 from which a series ofspokes 24, for example, five mutually angularlyequidistant spokes 24, protrudes radially. Thespokes 24 supportrespective fingers 26 at their external ends, which extend in a substantially longitudinal direction with respect to the axis of the hub. - The
hub 22 is fitted freely on thedriving shaft 30 that turns theflywheel 16, with thefingers 26 inserted in respectivelongitudinal slits 28 provided on thedrum 12. Thefingers 26 are rendered integral in rotation with thedrum 12 in the manner that will be described in detail hereinafter. At least one rolling bearing - twobearings 31 in this embodiment (Figure 4 ) - and a bush 32 (Figure 3 ) keyed on thedriving shaft 30 are interposed between thehub 22 and thedriving shaft 30. - In a per se conventional manner, the
bush 32 has an external cylindrical surface, which is engaged by the internal rings of therolling bearings 31, that has an axis that is oblique with respect to the axis of thedriving shaft 30. - The rotation of the
bush 32 imparts to thehub 22 and to thefingers 26 integral therewith, an oscillating motion that has a longitudinal component. In a per se conventional manner, this oscillating motion produces a progressive advancement of the loops of yarn, as they are wound on thedrum 12, by virtue of which the loops of yarn remain regularly mutually equidistant. - The
fingers 26 are connected to thedrum 12 by ajoint 33 which is configured to prevent the rotation of thefingers 26 around the axis of thedrum 12 and at the same time allow said oscillating motion. - The
joint 33 according to the invention comprises ahollow body 34 which is formed in one piece and has an internalannular portion 36 provided with a series of first internallongitudinal slots 38 which engage, in a per se axially free manner, correspondinglongitudinal protrusions 58 which are integral with thedrum 12, so as to render the internalannular portion 36 integral in rotation with thedrum 12, an externalannular portion 40 provided with a series of externallongitudinal slots 42 which engage, in a per se axially free manner, correspondinglongitudinal ribs 46 provided on thefingers 26, so as to render the external annular portion integral in rotation with thefingers 26, and anintermediate portion 48 which is yielding in a longitudinal direction and is substantially rigid in torsion. - Preferably, the internal
annular portion 36 is axially blocked with respect to thedrum 12 and, for this purpose, it is sandwiched, by clamping means which will be described in greater detail hereinafter, between anabutment 50 that is integral with thedrum 12 and aflange 54. - In this embodiment, the
abutment 50 has a substantially tubular profile, is accommodated coaxially inside thedrum 12, and has a series of second internal longitudinal slots 52 (Figure 3 ) aligned with the first ones; thelongitudinal protrusions 58 being provided on atubular extension 56 of theflange 54 and engaging both the first internallongitudinal slots 38 and the second internallongitudinal slots 52. - Preferably, the
hollow body 34 is made of a material that can flex elastically, advantageously neoprene or chloroprene. Furthermore, theintermediate portion 48 preferably has a thin-walled profile extending in a radial direction, and at least one corrugation in order to ensure suitable yielding in a longitudinal direction. - Advantageously, for lightening purposes, the external
longitudinal slots 42 are provided on respectiveradial protrusions 57 which extend monolithically outward from the externalannular portion 40. - With reference to
Figure 4 , theflange 54 has an outerflat portion 54a and an innerconical portion 54b which engages externally acorresponding bevel 59 provided on the internaltubular portion 36. - The clamping means comprise a bushing 60 which is threaded internally (
Figure 4 ), is accommodated in theabutment 50 and is integral therewith, and afirst screw 62 which is inserted in theflange 54 and is screwed to one end of the bushing 60. Advantageously, as shown in the figures, a screw provided with a conical head is used in order to engage theconical portion 54b of theflange 54 to ensure correct centering. - The
abutment 50 is fixed to afront wall 12a of thedrum 12 by means of asecond screw 64 which is provided with aknob 66 for manual tightening. Thesecond screw 64 is inserted in thefront wall 12a and is screwed to the opposite end of the bushing 60 with respect to thefirst screw 62. - With particular reference to
Figures 3 and4 , the externaltubular portion 40 of thehollow body 34 is delimited axially between a firstflat end surface 40a which faces thehub 22 and a secondflat end surface 40b which faces thefront wall 12a of thedrum 12. The firstflat end surface 40a has anannular groove 68 which engages, for centering purposes, a correspondingannular lip 22a which extends axially from the end of thehub 22. - In the embodiment described herein, the
abutment 50 has anappendage 70 for supporting sensors and any other accessory devices that lie outside the aim and objects of the present invention. - In operation, in a per se conventional manner, while the driving
shaft 30 turns in order to wind new loops of yarn onto thedrum 12 by virtue of theflywheel 16, thehub 22, and thefingers 26 with it, perform an oscillating motion imparted by the bush on which thehub 22, by means of therolling bearings 31, is fitted. - The
hollow body 22 prevents the rotation of thehub 22 and of thefingers 26 with respect to thedrum 12 but, by deforming in the region of theintermediate portion 48, allows the above mentioned oscillating motion. - In practice it has been demonstrated that the system according to the invention allows to fully achieve the intended aim and objects.
- In particular, the assembly of the
spacer device 20, and particularly of thejoint 33, in thedrum 12 is very easy. For example, first thehollow body 34 can be fixed to theabutment 50 by means of theflange 54 and thefirst screw 62. Then it is possible to fix the unit thus assembled to thedrum 12 by means of thesecond screw 64. Finally, the drum can be fixed to the body of thefeeder 10. By placing thedrum 12 axially adjacent to the body of thefeeder 10, the externallongitudinal slots 42 of the externaltubular portion 40 engage thelongitudinal ribs 46 of thefingers 26, while theannular groove 68 engages theannular lip 22a of thehub 22, thus ensuring a perfect centering. - The manufacture of the joint according to the invention does not require particular treatments and therefore is much cheaper than known solutions, which are based on vulcanization treatments.
-
Figure 5 shows a further embodiment of the invention, in which elements similar or identical to those of the previous embodiment are designated by the same reference numeral increased by 100. - In particular, this embodiment differs from the preceding one in that the
longitudinal protrusions 158, which engage the first internallongitudinal slots 138 of the internalannular portion 136 of thehollow body 134, are provided on atubular extension 156 which is integral with theabutment 150, and the internalannular portion 136 is sandwiched between theabutment 150 and awasher 154, which takes the place of the flange of the previous embodiment, by virtue of ascrew 162 screwed on thetubular extension 156. - Some preferred embodiments of the invention have been described, but of course the person skilled in the art will be able to make various modifications and variations within the scope of the claims.
- For example, the longitudinal slots, which acts as rotational coupling surfaces, and the longitudinal protrusions and the longitudinal ribs, which act as rotational coupling counter-surfaces, might be swapped. Moreover, the rotational coupling may be provided differently, for example, by engagement between polygonal surfaces.
- Naturally, the mechanism that produces the oscillation of the fingers lies completely outside the aim and objects of the present invention and may be provided differently from what is described here and illustrated by way of example, for example, with systems based on cams or on articulated levers.
- The shape of the
hollow body 34 also may be modified within the limits of what is claimed. For example, depending on the available spaces, the intermediate portion could be extended in an axial direction instead of radially as in the example described herein, and/or it might have a greater number of corrugations. - The disclosures in
Italian Patent Application No. 102020000018535 - Where technical features mentioned in any claim are followed by reference signs, those reference signs have been included for the sole purpose of increasing the intelligibility of the claims and accordingly, such reference signs do not have any limiting effect on the interpretation of each element identified by way of example by such reference signs.
Claims (15)
- An accumulation yarn feeder, comprising a hollow drum (12) on which motorized winding means (16) wind loops of yarn, and a spacer device (20) provided with a series of fingers (26) which are inserted in respective longitudinal slits (28) of the drum (12) and are actuated with an oscillating motion that has a longitudinal component, so as to produce the progressive advancement of the loops of yarn while winding on the drum (12), said fingers (26) being connected to said drum (12) by a partially yielding joint (33) which is configured to prevent the rotation of the fingers (26) around the axis of the drum (12) and allow said oscillating motion, characterized in that said joint (33) comprises a hollow body (34) which is formed in one piece and has- an internal annular portion (36) provided with first rotational coupling surfaces (38) which engage, in a per se axially free manner, corresponding first rotational coupling counter-surfaces (58) which are integral with the drum (12), so as to make said internal annular portion (36) integral in rotation with the drum (12),- an external annular portion (40) provided with second rotational coupling surfaces (42) which engage, in a per se axially free manner, corresponding second rotational coupling counter-surfaces (46) which are integral with the fingers (26), so as to make said external annular portion (40) integral in rotation with the fingers (26), and- an intermediate portion (48) which is yielding in a longitudinal direction and is substantially rigid in torsion.
- The accumulation yarn feeder according to claim 1, characterized in that said internal annular portion (36) is sandwiched, by clamping means (60, 62), between an abutment (50) that is integral with the drum (12) and a flange (54).
- The accumulation yarn feeder according to claim 2, characterized in that said abutment (50) has a substantially tubular profile and is provided with third rotational coupling surfaces (52) aligned with the first rotational coupling surfaces (38); said first rotational coupling counter-surfaces (58) being provided on a tubular extension (56) of said flange (54) and engaging both said first rotational coupling surfaces (38) and said third rotational coupling surfaces (52).
- The accumulation yarn feeder according to claim 3, characterized in that said first rotational coupling surfaces comprise a series of internal longitudinal slots (38) provided on said internal annular portion (36), said third rotational coupling surfaces comprise a series of internal longitudinal slots (52) provided on said abutment (50), and said first rotational coupling counter-surfaces comprise a series of longitudinal protrusions (58) which are inserted in said first internal longitudinal slots (38) and said second internal longitudinal slots (52).
- The accumulation yarn feeder according to one of claims 1-4, characterized in that said second rotational coupling surfaces comprise a series of external longitudinal slots (42) and said second rotational coupling counter-surfaces comprise a series of corresponding longitudinal ribs (46) provided on said fingers (26).
- The accumulation yarn feeder according to claim 5, characterized in that said external longitudinal slots (42) are provided at the ends of respective radial protrusions (57) which extend monolithically outward from said external annular portion (40).
- The accumulation yarn feeder according to one of claims 3-6, characterized in that said clamping means comprise a bushing (60) which is threaded internally and is inserted in said abutment (50), and a first screw (62) which is inserted in said flange (54) and is screwed to one end of said bushing (60).
- The accumulation yarn feeder according to claim 7, characterized in that said abutment (50) is fixed to a front wall (12a) of said drum (12) by means of a second screw (64) that is inserted in the front wall (12a) and is screwed to the opposite end of said bushing (60).
- The accumulation yarn feeder according to claim 8, characterized in that said second screw (64) is provided with a knob (66) for manual tightening.
- The accumulation yarn feeder according to one of claims 1-9, wherein said fingers are integral with a hub (22) which is coaxial with said drum (12), characterized in that said external tubular portion (40) is delimited axially by a flat surface (40a) which faces said hub (22) and is provided with an annular groove (68) which engages, for centering purposes, a corresponding annular lip (22a) which extends axially from said hub (22).
- The accumulation yarn feeder according to one of claims 1-10, characterized in that said hollow body (34) is made of an elastically yielding material.
- The accumulation yarn feeder according to one of claims 1-11, characterized in that said intermediate portion (48) has a thin-walled profile extending in a radial direction.
- The accumulation yarn feeder according to one of claims 1-12, characterized in that said intermediate portion (48) has at least one corrugation.
- The accumulation yarn feeder according to claim 2, characterized in that said abutment (50) has a substantially tubular profile and said first rotational coupling counter-surfaces (158) are provided on said abutment (150).
- The accumulation yarn feeder according to claim 14, characterized in that said first rotational coupling surfaces comprise a series of internal longitudinal slots (138) provided on said internal annular portion (136), and said first rotational coupling counter-surfaces comprise a series of longitudinal protrusions (158) provided on a tubular extension (156) of the abutment (150) and inserted in said first internal longitudinal slots (138).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102020000018535A IT202000018535A1 (en) | 2020-07-30 | 2020-07-30 | ACCUMULATION YARN FEEDER EQUIPPED WITH SPACER DEVICE FOR THE SEPARATION OF THE YARN TURNS WINDING ON THE DRUM. |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3945150A1 true EP3945150A1 (en) | 2022-02-02 |
EP3945150B1 EP3945150B1 (en) | 2023-01-25 |
Family
ID=72801974
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21176649.8A Active EP3945150B1 (en) | 2020-07-30 | 2021-05-28 | Accumulation yarn feeder provided with a spacer device for separating the loops of yarn wound on the drum |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3945150B1 (en) |
CN (2) | CN216712386U (en) |
IT (1) | IT202000018535A1 (en) |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07133553A (en) * | 1993-11-09 | 1995-05-23 | Toyota Autom Loom Works Ltd | Device for measuring length of weft and storing weft in jet loom |
JP2000073255A (en) * | 1998-08-24 | 2000-03-07 | Tsudakoma Corp | Measured amount-adjusting and setting device in weft yarn length measuring and storing device |
EP0829442B1 (en) | 1996-09-11 | 2002-02-20 | L.G.L. Electronics S.p.A. | Device for spacing turns of thread for weft feeders |
EP3587643A1 (en) * | 2018-06-28 | 2020-01-01 | Memminger-IRO GmbH | Thread delivery device and system with such a device |
-
2020
- 2020-07-30 IT IT102020000018535A patent/IT202000018535A1/en unknown
-
2021
- 2021-04-27 CN CN202120891658.1U patent/CN216712386U/en active Active
- 2021-04-27 CN CN202110458497.1A patent/CN114059222A/en active Pending
- 2021-05-28 EP EP21176649.8A patent/EP3945150B1/en active Active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH07133553A (en) * | 1993-11-09 | 1995-05-23 | Toyota Autom Loom Works Ltd | Device for measuring length of weft and storing weft in jet loom |
EP0829442B1 (en) | 1996-09-11 | 2002-02-20 | L.G.L. Electronics S.p.A. | Device for spacing turns of thread for weft feeders |
JP2000073255A (en) * | 1998-08-24 | 2000-03-07 | Tsudakoma Corp | Measured amount-adjusting and setting device in weft yarn length measuring and storing device |
EP3587643A1 (en) * | 2018-06-28 | 2020-01-01 | Memminger-IRO GmbH | Thread delivery device and system with such a device |
Also Published As
Publication number | Publication date |
---|---|
IT202000018535A1 (en) | 2022-01-30 |
EP3945150B1 (en) | 2023-01-25 |
CN114059222A (en) | 2022-02-18 |
CN216712386U (en) | 2022-06-10 |
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