Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
  • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
  • B65H54/00—Winding, coiling, or depositing filamentary material
  • B65H54/02—Winding and traversing material on to reels, bobbins, tubes, or like package cores or formers
  • B65H54/28—Traversing devices; Package-shaping arrangements
  • B65H54/2827—Traversing devices with a pivotally mounted guide arm
• • 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
  • B65H2701/10—Handled articles or webs
  • B65H2701/17—Nature of material
  • B65H2701/174—Textile; fibres
  • B65H2701/1742—Fibreglass
• • 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 the field of winding a textile yarn on a support in order to form a reel during the various steps involved in its production (spinning, stretching, texturing, twisting or any other operation ...), said support being driven either by its axis or by pressure on a controlled organ.
• the wire In a coil, the wire is distributed along its generator in the form of helical turns, either juxtaposed and parallel, or, more generally, shifted and crossed one layer relative to the other. To perform such an operation, the wire is guided by a guide device driven by a movement back and forth along the generatrix of the coil which will be referred to in the following by device-va- and- comes.
• the speed of movement of the wire guide along the coil is constant, forming helical turns, with a reversal of motion at both ends.
• This inversion is performed as quickly as possible so that a minimum of tangent wire is deposited with the edge of the coil, to avoid the risk of collapse of these son on the sidewall, a defect usually called " fallen ends", and to limit the increased deposition of yarn in the extremities, inhomogeneity of the density and formation called "saddle of horse".
• the winding stroke which is determined by the distance between the two reversal points of the movement, is fixed or variable depending on the diameter according to a law of evolution allowing for example the formation of conical flanks .
• Many solutions have been proposed for making reciprocating systems for distributing the wire on the surface of the coil.
• the present invention more particularly relates to reciprocating devices whose wire guide is set in motion by means of an arm coupled to a motor, and driven by an alternating rotation movement between two angular positions.
• EP1089933 discloses such a reciprocating device that will be referred to in the following by means of back-and-forth device with "swingarm".
• the system consists of a wire guide mounted at the end of a pivoting arm coupled to the axis of an electric motor, which is connected to a programmable control unit. Referring to Figures 1 and 2 illustrating such a system of back and forth.
• Patent CH693337 proposes improvements, in particular arm designs with reduced moment of inertia, manufactured according to a hollow profile made of composite material based on carbon fiber.
• the arm must maintain a sufficient stiffness in the plane perpendicular to its plane of oscillation to resist the traction of the wire and bending, twisting or buckling under the effect of angular accelerations.
• the invention relates to a reciprocating device with an oscillating arm about an axis equipped with a wire guide and coupled to an electric motor itself connected to a control unit able to order a rotational movement. alternative between two angular positions.
• the oscillating arm has a width adapted to give it a high stiffness in its plane of oscillation and a thickness adapted to confer a low stiffness in a plane perpendicular to said plane of oscillation, said arm being mounted in combination with guiding means shaped to limit or prohibit any deformation in said perpendicular plane while allowing the alternating rotation movement between two angular positions.
• the width (L) of the arm, in the vicinity of the axis of rotation is greater than or equal to the width considered in the vicinity of the wire guide, the evolution profile being rectilinear, or curvilinear, and may have discontinuities (or stairs).
• the thickness (t) of the arm, in the vicinity of the axis of rotation is greater than or equal to the thickness considered in the vicinity of the wire guide, the evolution profile being rectilinear, or curvilinear, and may have discontinuities (or stairs), the ratio L / t being greater than 15 in the vicinity of the axis of rotation, and decreasing towards the end of the arm, remaining in any point greater than or equal to 4.
• the thickness (t) of the arm is constant, the ratio L / t being greater than 15 and preferably greater than 30 in the vicinity of the axis of rotation, and decreasing towards the end of the arm, remaining in all point greater than or equal to 4.
• the oscillating arm has recesses.
• the arm can be obtained by cutting into a plate of material of constant thickness, using any cutting process (for example sawing, fretwork, milling, water jet, laser, plasma The same method is used for peripheral cutting and recesses.
• any cutting process for example sawing, fretwork, milling, water jet, laser, plasma
• the guide means consist of at least two elements arranged on either side of said oscillating arm, and having surfaces or areas of contact extending over the swept area during reciprocation.
• the guide elements have points or zones placed facing each other to provide guidance, said points or zones being separated by a distance equal to the thickness of the oscillating arm increased by one set.
• the above game may result from different embodiments. Especially :
• the game is distributed on both sides of the arm when the arm is at rest;
• the game is variable from one point to another to control the deformation of the arm, for example decreasing along the arm to be minimal in the vicinity of the guide wire;
• the clearance is variable and defines limited guide zones, these zones being point, linear or surface, to minimize the contact surfaces; the guide zones of each guide element are placed opposite, on either side of the arm.
• the guide clearance is, in all points considered in the guide zones, along the arm and / or the extent of its deflection, between 0% and 100% and preferably between 40% and 60% of the thickness of the arm at the point considered, that is to say that the distance between the guide faces at a given point is between 1 and 2 and preferably between 1.4 and 1.6 times the thickness (t) of the arm at the point considered.
• Another problem to be solved by the invention is to integrate means for positioning the wire in the wire guide.
• the oscillating arm is equipped with a "U" shaped wire guide, while at least one of the guide means has a profiled shape in the portion to the right of the guide wire, arranged such that wire is positioned in the U-shaped wire guide along its reciprocating motion, by pressing on the shaped shape nearest to said guide.
• FIG. 1 is a schematic perspective view of a swing-back system, according to the prior art.
• Figure 2 is a side view corresponding to Figure 1.
• FIG. 3 is a front view of an oscillating arm made according to the invention.
• FIG. 4 is a side view of the arm according to the invention.
• Figure 5 is an example of section of the arm according to the invention.
• FIG. 6 is a schematic view of the arm in its guide system.
• Figure 7 shows a detail of Figure 6.
• Figures 8 and 9 show an alternative embodiment corresponding to Figures 6 and 7.
• FIG. 10 is a schematic perspective view of the system according to the invention.
• FIG. 11 is an example of a drawing of the oscillating arm produced according to the invention.
• FIG. 12 is an example of drawing of the profile of the guiding device or devices for changing the position of the wire in the wire guide as a function of the angle of the arm.
• the invention therefore relates to a reciprocating device consisting of a wire guide (4) attached to the end of an oscillating arm (5) around a shaft (7), coupled to an electric motor. (6) itself connected to a steering unit capable of ordering an alternating rotational movement between two angular positions.
• the wire guide (4) may be a ceramic wire guide attached by gluing on the arm (5).
• the wire guide (4) may consist of a shape formed in the arm (5), said form receiving a surface treatment capable of giving it resistance to abrasion of the wire (1) and a state of surface capable of not damaging said wire.
• this surface treatment may be the application of a ceramics deposit by plasma torch followed by polishing.
• the arm (5) is fixed by any attachment and coupling means to the motor shaft (7).
• the motor (6) is controlled by a system giving it an alternating rotational movement between two angular positions, the reversal of the direction of rotation at said angular positions being very fast.
• the axis of rotation of the shaft (7) is perpendicular to the plane of the profiled arm (5).
• the reciprocating movement of the shaft (7) is transmitted to the arm (5), which is thus subjected to oscillation movement in its own plane.
• the oscillating arm (5) has a profiled shape, cutting into a flattened plate-shaped shape of thickness (t).
• the profiled arm (5) has a thickness (t) variable or constant, which is in any point small relative to its width (L).
• the thickness (t) is constant, so that the arm (5) can be obtained by cutting in a raw material in the form of sheet, sheets or plates.
• thermosetting materials such as thermosetting materials
• the arm (5) has, given the width (L), a high stiffness in its plane of oscillation and, given its small thickness (t), a low stiffness in the plane perpendicular to this oscillation plane.
• the oscillating arm (5) has, separately or in combination, the following characteristics:
• section of the oscillating arm (FIG 5)
• the arm has particular arrangements to the right of its axis of rotation and to the right of the guide wire, in particular for the purpose of fixing, which will not be taken into account or included in the "section” thus defined.
• the section of the oscillating arm (5) is generally inscribed in a substantially rectangular shape, the large side (L) of the rectangle, which corresponds to the width of the arm to the right of the section considered, being parallel to the plane of oscillation , and the small side (t) of the rectangle which represents the thickness of the arm to the right of the section considered, being perpendicular to the plane of oscillation and parallel to the axis of rotation.
• the exposed dimensional characteristics flatness, parallelism, thickness, distances, etc. may be affected by variations due to manufacturing tolerances.
• the section of the oscillating arm (5) is scalable, so that:
• the width (L) of the arm (5) in the vicinity of the axis of rotation (7) is greater than or equal to that in the vicinity of the wire guide (4), the evolution profile being rectilinear, curvilinear, and / or having discontinuities (or stairs);
• the thickness (t) of the arm in the vicinity of the axis of rotation (7) is greater than or equal to that in the vicinity of the wire guide (4), the evolution profile being rectilinear, curvilinear, and / or having discontinuities (or stairs).
• the width (L) of the section of the oscillating arm is progressive, the thickness (t) of the arm being constant.
• the arm (5) can be obtained by cutting in a plate of constant thickness material (t), by means of any cutting process (for example sawing, fretwork, milling, water jet , laser, plasma ). This same method is implemented for peripheral cutting and recesses (8).
• the thickness (t) of the profile is chosen to be the smallest possible between 0.5 mm and 3 mm and advantageously between 0.75 mm and 1.25 mm.
• the width (L) is then calculated to give the arm a resistance and a stiffness in its oscillation plane sufficient to withstand the accelerations upon overturning at the ends of the oscillation motion. According to this calculation, the profile of the bending moment resulting from the application of the inertial force, leads to the necessary width (L) being maximum in the vicinity of the axis of rotation (7), and decreasing as and when as one moves towards the end.
• the width (L) at the end of the arm is conditioned by the embodiment or integration of the function "wire guide" (4).
• the bending calculation in the oscillation plane shows that the reduction in thickness (t) proportionally reduces the mass and therefore the inertia forces of the arm so that it would theoretically be possible to tend towards zero.
• the arm must also have a resistance to bending in the perpendicular plane to withstand on the one hand the pulling of the yarn causing bending in this perpendicular plane, as well as torsions, but especially to resist the spill phenomenon of its section, ie a deformation combining twists and buckling of the portion of the profile compressed under the effect of the bending moment.
• This spill is an unstable deformation that occurs in a direction that corresponds to the minimum axis of inertia of the profile, here the direction of the thinnest thickness (t).
• the calculation and the experiment show that the ratio between the width (L) and the thickness (t) of the profile must remain less than 8 or 10 at any point to ensure stability.
• the calculation and the experiment also show that for a ratio (L) / (t) greater than 10 the phenomenon of spill / buckling / torsion appears well before reaching the limits of the plane flexural system.
• a very small thickness of the arm is therefore adopted and, in order to reach the limits of the planar bending system in the plane of oscillation, the latter is subjected to guiding means intended to block or limit the degrees of oscillation. freedom in the direction of deformation by twisting, buckling and / or spilling.
• these guide means consist essentially of at least two elements (9, 10) arranged on either side of the oscillating arm (5) and having surfaces or zones of contact (11, 12 ) extending over the swept area during the back-and-forth movement.
• the elements (9) (10) are fixed and are secured to a frame that has, for example, a machine receiving the winding system, without excluding other modes of attachment.
• the elements (9) (10) can be integral with the winding system.
• the guide means therefore ensure the relative positioning of the reciprocating device with swing arm relative to the winding members of the coil.
• the guiding means are designed according to detailed features below, so that they block or limit the deformation capacity of the arm within the limits acceptable by the material, that is to say causing constraints in the material lower than the practical fatigue limit of the material in the direction of the deformed, taking into account the alternating forces due to the movement back and forth.
• the calculation and the experiment show that one can obtain a correct functioning of the system with a ratio (L) / (t) higher than 40 in the vicinity of the axis of rotation, and decreasing towards the end of the arm, remaining in all points greater than or equal to 5, without reaching the limits of the flexural system.
• the guide means (9, 10) of the arm (5) are determined for:
• the arm moves between the two elements (9, 10), which are defined so that, between points or zones placed facing each other and guiding, there is a distance (d) equal to arm thickness (t) increased by a game (J1 + J2), said game being distributed on both sides (Jl) and other (J2) of said arm (5) when the arm is at rest.
• J1 + J2 The game (J1 + J2) can be equal anywhere, along the arm and the extent of its movement.
• the game (J1 + J2) can be variable from one point to another to control the deformation of the piece.
• the game can move along the arm to be minimal in the vicinity of the guide wire.
• the game may be variable defining limited guide zones (11, 12), or even point or linear, to minimize the contact surfaces.
• the guide zones correspond to surfaces placed opposite.
• the guide means according to the invention consists of two parallel flat surfaces spaced by a distance (d) constant and equal to the thickness of the arm (t) increased by constant play (J1 + J2) ( Figure 7).
• the functional clearance is determined to meet the following characteristics:
• the guide clearance (J1 + J2) is, at all points considered in the guide zones, along the arm and / or the extent of its travel, between 0% and 100% of the thickness. arm (t).
• the distance between the guide faces at a given point is between 1 and 2 times the thickness of the arm at the point in question.
• the guide length which is considered here to be the width "L" of the arm (and / or possibly the width of the contact areas if these areas are discontinuous) must respect a ratio ("L" / "D") greater than 3.
• the portion guiding the wire (4) is of substantially "U" shape of elongate legs, the wire (1) being guided transversely by the legs of said "U", its positioning in the "U” being determined by the supporting the wire on said profiled fixed member.
• the support profile may be integrated in at least one of the guide means (9) or (10).
• at least one of the means (9) or (10) has a profiled shape (13) considered to the right of the guide wire.
• the wire (1) is positioned in the U-shaped wire guide along its reciprocating movement, by pressing on the profile (13) as close as possible to said guide (4).
• the means (9) or (10) having this profile receive a surface treatment conferring resistance to wear and proper sliding of the wire, at least in said contact zone of said profile (13).
• the oscillating arm (5) is made by cutting into a composite material plate made of epoxy resin and woven carbon fibers.
• the plate is formed of three layers of carbon fabric and has a constant thickness of 1 mm.
• the arm (5) is cut in this plate according to the profile shown in Figure 11. It has a useful length of 270 mm, a width of 40 mm at its axis of rotation and 6 mm at the wire guide.
• Prototypes were made with a ceramic wire guide (4), fixed by gluing to the end of the arm.
• the weight of the arm (5) thus produced is 3.8 grams.
• the arm (5) is associated with a guiding system formed of two plates (9, 10) made of steel, placed on either side of the arm (5) with a spacing (d) constant of 1.5 mm.
• One of the plates has a profile contour (13) polished so as to position the wire (1) in the wire guide depending on the angle of the arm as shown in Figure 12 given here by way of example.

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• Transmission Devices (AREA)
• Mechanically-Actuated Valves (AREA)
• Manipulator (AREA)
• Forging (AREA)
• Transplanting Machines (AREA)

Applications Claiming Priority (2)

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• 2005
  • 2005-07-11 FR FR0552138A patent/FR2888226B1/fr not_active Expired - Fee Related
• 2006
  • 2006-07-10 WO PCT/FR2006/050700 patent/WO2007007004A2/fr not_active Ceased
  • 2006-07-10 DE DE602006021422T patent/DE602006021422D1/de active Active
  • 2006-07-10 AT AT06779037T patent/ATE506312T1/de not_active IP Right Cessation
  • 2006-07-10 EP EP06779037A patent/EP1901985B1/de not_active Not-in-force

Non-Patent Citations (1)

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