Classifications

• • D—TEXTILES; PAPER
  • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
  • D04H—MAKING TEXTILE FABRICS, e.g. FROM FIBRES OR FILAMENTARY MATERIAL; FABRICS MADE BY SUCH PROCESSES OR APPARATUS, e.g. FELTS, NON-WOVEN FABRICS; COTTON-WOOL; WADDING ; NON-WOVEN FABRICS FROM STAPLE FIBRES, FILAMENTS OR YARNS, BONDED WITH AT LEAST ONE WEB-LIKE MATERIAL DURING THEIR CONSOLIDATION
  • D04H18/00—Needling machines
  • D04H18/02—Needling machines with needles

Definitions

• the present invention relates to a needling machine used to mechanically consolidate a sheet of fibers obtained for example from a lapper spreader.
• Known needling machines include a support called a board on which needles are fixed. By means of connecting rod-crank devices, the board is driven in an alternating movement so that these needles cross the sheet of fiber at a rate which can go into production from 1000 to 2000 strokes per minute.
• Complementary devices also make it possible to regulate the flow of fibers entering and leaving the machine with or without drawing and at speeds chosen as a function of the striking rate in number of strokes per minute, equivalent to the number of alternating movements of the needles per minute .
• each connecting rod-crank device extends between an eccentric connected to a motor, and a joint at the end of a sliding rod to which a needle board support is fixed.
• the sliding rod passes through two sliding bearings located at a certain distance from each other.
• This arrangement has the disadvantage that the bearings are strongly loaded radially in a direction which is always the same, namely the direction of the lateral reaction force which appears between the connecting rod and the rod due to the angle formed between them, taking into account the angular movement of the rod around its axis of articulation with the rod. It is especially the bearing which is closest to the joint which is the most loaded, typically five to ten times more than the other. These bearings undergo their maximum load, with an inclination to the arc all the stronger when the rod is inclined, when the rod pushes the rod to penetrate the needles into the fibrous products. Furthermore, in certain cases, the tensile forces of the nonwoven product are transmitted to the needles when the latter are inserted into the product.
• the object of the present invention is thus to propose a needling machine in which the problem of wear of the sliding bearings is significantly reduced.
• the needling machine for mechanically consolidating a sheet of fibers comprising,
• a mobile assembly comprising a needle board support and at least one rod mounted to slide in a direction transverse to the ply in at least one sliding bearing,
• a connecting rod having a first end articulated to a driving crank and a second end connected to the rod by an articulation, to transmit to the support an alternating movement back and forth is characterized in that the bearing is angularly adjustable ent around the axis of the rod relative to the needling machine case.
• the adjustable bearing (s) When the adjustable bearing (s) are worn along an axis of ovalization, it suffices to rotate it (s) by a fraction of a turn so that the diametral play due to wear is henceforth angularly offset with respect to the direction of the dangerous radial forces, that is to say in general with respect to the plane of oscillation of the connecting rod.
• FIG. 1 is a schematic elevational view, partly in section, of a needling machine according to the invention.
• - Figure 2 is a view along II-II of the figure
• the needling machine shown in FIG. 1 comprises a generally horizontal perforated table 1 and a retaining plate 2, also called “stripper", placed approximately parallel to a certain distance above the table 1.
• the table 1 and the stripper 2 define between them a path in a substantially horizontal plane for a sheet of fibers 3.
• the stripper 2 includes perforations aligned with those of the table 1.
• introducer means 4 schematically in the form of 'A pair of drive rollers between which passes the sheet 3.
• extractor means 6 also shown schematically by two drive rollers between which passes the sheet.
• the stripper 2 is placed between the path of the ply 3 and a needle board 7.
• the board 7 carries on the side of the stripper 2 a large number of needles 8 oriented perpendicular to the plane of the path of the ply 3, with their point directed towards the ply 3.
• Each needle is positioned in face of a perforation of the stripper 2 and of a corresponding perforation of the table 1.
• the needle board 7 is fixed, on the side opposite the needles 8, to a support 9 itself fixed at the end of at least a rod 11 slidingly mounted along an axis 12 parallel to the needles 8 and perpendicular to the plane of the path of the web 3. If several rods 11 are provided, these are for example aligned one behind the other when they are seen as shown in Figure 1.
• each sliding rod 11 is guided in two coaxial sliding bearings 13 and 14, axially spaced.
• the bearings 13 and 14 are made integral, by means which will be described later, with a casing 16 which is only partially shown.
• the bearings 13 and 14 include anti-friction rings 17 for contact with the rod 11.
• the movable assembly consisting of the sliding rod (s) 11, the support 9 and the board 7 is driven in service by an alternating movement back and forth in the direction 12 between a position 7a in which the end of the needles, designated in this case by 8a, passes through the stripper 2, the ply 3 and the table 1, and a release position 7b in which the needles 8 are completely released at least from the table 1 and the ply 3, and possibly from the stripper 2.
• the rod 11 is articulated by a joint 18 at one end of a connecting rod 19, the other end of which is connected by a joint 21 to a crank 22 driven in rotation by means motors not shown.
• the two bearings 13, 14 are made integral with one another by being formed on a common tubular mount 41 which is coaxial with the rod 11 and which can be adjusted angularly around the axis 12 of the rod 11 relative to the casing 16.
• the anti-friction rings 17 are fixed in the frame 41.
• the casing 16 has, through a lower wall facing the support 9, a circular orifice 42 centered on the axis 12.
• the mount 41 is mounted through the orifice 42 and has a flange 43 for centering in the orifice 42. From side of the outside of the casing 16 the mount 41 is terminated by a flange 44 comprising for example six fixing holes 46 regularly distributed angularly around the axis 12, intended to receive six clamping means 47, such as bolts, coming engaged in corresponding holes in the housing 16.
• the clamping means 47 are dismantled, the frame is made to perform a rotation of for example 60 ° equivalent to an integer number of times the step of succession of the clamping means 47 around the axis 12, and the clamping means are replaced.
• marks 48 and respectively 49 which are coincident when the machine is new but which, as shown in FIG. 2 by way of example, are then angularly offset by the adjustments successively made for the mount 41.
• An arrow 51 also indicates the direction of rotation recommended for making the adjustments, so that we know, from a given setting, the direction to choose so as not to return to a position already used .
• the rod 11 comprises, from its end 27 facing the connecting rod 19, a first region 28 having a cylindrical outer wall which is slidably engaged in that of the bearings 13 and 14 which is closest to the crank 22.
• the rod 11 further comprises a second region 32 which has a smaller diameter than the first region 28.
• the cylindrical outer wall of the second region 32 slides in the bearing 14 which is closest to the needle board 7, and which has a smaller diameter than the bearing 13.
• the bearing 13, which is the busiest in service, has a considerably increased diameter which makes it particularly resistant to wear.
• the force F transmitted by the connecting rod 19 when it is inclined relative to the rod 11 has a transverse component Fp which tends to ovalize the bearings 13 and 14 according to a diameter parallel to the angular plane of movement of the connecting rod 19.
• the frame 41 is angularly adjusted with respect to the casing 16, as has been said above, so that the force Fp is now exerted on the bearings 13 and 14 according to the diameters thereof. which have not yet been enlarged by the ovalization phenomenon.
• the invention is not limited to the example described and shown.
• the two bearings could be adjustable independently of each other. It would also be possible for only one of the bearings, for example the bearing 13 which is the most stressed, to be adjustable.
• each bearing could be produced by means of a bore comprising an appropriate surface treatment, for example a bore made directly in the material of a pivoting mount corresponding moreover to the 7 frame 41.
• the invention is applicable to all types of needling machines, in particular needling machines with a perforated table as described, but also needling machines for the production of velvet, loops, etc.

Landscapes

• Engineering & Computer Science (AREA)
• Textile Engineering (AREA)
• Nonwoven Fabrics (AREA)
• Looms (AREA)
• Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
• Finger-Pressure Massage (AREA)
• Sewing Machines And Sewing (AREA)

Applications Claiming Priority (3)

Publications (2)

Family

ID=9469592

Family Applications (1)

Country Status (11)

Families Citing this family (11)

Family Cites Families (3)

• 1994
  • 1994-12-08 FR FR9414759A patent/FR2727989A1/fr active Granted
• 1995
  • 1995-12-07 JP JP8517375A patent/JPH10510329A/ja active Pending
  • 1995-12-07 CA CA002208433A patent/CA2208433A1/fr not_active Abandoned
  • 1995-12-07 US US08/849,857 patent/US5864930A/en not_active Expired - Fee Related
  • 1995-12-07 DE DE69511429T patent/DE69511429T2/de not_active Expired - Fee Related
  • 1995-12-07 AT AT95942220T patent/ATE183256T1/de not_active IP Right Cessation
  • 1995-12-07 EP EP95942220A patent/EP0796364B1/de not_active Expired - Lifetime
  • 1995-12-07 ES ES95942220T patent/ES2136324T3/es not_active Expired - Lifetime
  • 1995-12-07 WO PCT/FR1995/001619 patent/WO1996017988A1/fr active IP Right Grant
  • 1995-12-07 CN CN95197485A patent/CN1076411C/zh not_active Expired - Fee Related
  • 1995-12-13 TW TW084113273A patent/TW283172B/zh active

Non-Patent Citations (1)

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