US3522780A - Needle bar for hosiery linking machines - Google Patents

Needle bar for hosiery linking machines Download PDF

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Publication number
US3522780A
US3522780A US734982A US3522780DA US3522780A US 3522780 A US3522780 A US 3522780A US 734982 A US734982 A US 734982A US 3522780D A US3522780D A US 3522780DA US 3522780 A US3522780 A US 3522780A
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needle
bar
needle bar
hosiery
axis
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US734982A
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English (en)
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Cesare L Conti
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B7/00—Linking machines, e.g. for joining knitted fabrics

Definitions

  • a needle-bar for linking machines (loopers) for hosiery is disclosed, in which the needle is mounted eccentrically with respect to the axis of said needle-bar. Means are further provided for varying the eccentricity of the needle with respect to the needle-bar, care being taken in any case that the axes of the needle and the needle-bar are rigorously parallel to one another.
  • the advantage afforded by the novel eccentric needle bar is that, whenever the needle bar is to receive, in addition to its conventional reciprocal motion, also a partial alternating rotation about its own axis, the control mechanisms which govern the movement of the needle bar can be considerably simplified. Thus, the reliability of the machine and its working speed are considerably improved.
  • This invention relates to a constructional arrangement of needle bars, especially for hosiery linking machines.
  • linking machines in general possess, as one of their essential members for formation of the kind of stitch selected according to the work to be completed, a needle bar intended for firmly supporting the needle and imparting thereto any desired movement by the agency of appropriate mechanisms: these latter will no longer be cited in detail since they are well known to those skilled in the art and, on the other hand, they do not form an integral part of the subject invention.
  • the principal object of this invention is to simplify to the utmost the control mechanisms in all the cases in which the needle bar of a linking machine is to receive, in addition to its usual rectilinear reciprocation, a movement perpendicular thereto for achieving the cooperation between the needle bar and the impaling pins for the work: the latter movement is conventionally performed at present by means of a cam and appropriate crank mechanisms: these latter can now be dispensed with in an advantageous manner by resorting to the teachings of the present invention, the result being a considerable simplification of the construction of the machine, which also entails a remarkable increase of the speed of operation thereof.
  • the needle is eccentrically mounted with respect to the needle bar, means being preferably, but not necessarily, provided for varying, either upon assembly or during the operation of the machine, said eccentricity within a certain range, the needle bar further receiving a movement of partial alternating rotation about its own axis.
  • the means provided for varying the eccentricity of the needle with respect to the needle bar are many; thus, an infinity of these means can be envisaged without departing from the spirit and scope of this invention; what actually matters is that such an eccentricity exists and, preferably, that it be adjustable.
  • the needle-bar and needle assembly can be provided beforehand with a fixed eccentricity, said fixed eccentricity being selected to fulfil certain particular require ments, for example for the production of a certain class of hosiery articles.
  • the means provided for imparting to the needle bar the above cited alternating partial rotary movement about its own axis are also many: by way of example, see the linking machine disclosed and claimed in U.S. Patent Application Serial No. 610,948 cited hereinabove.
  • FIGURE I is a side elevational view of a needle bar having an eccentric needle according to this invention.
  • FIGURE 2 is a plan view of the needle bar shown in FIG. 1.
  • FIGURE 3 is a diagrammatical showing of the horizontal reciprocation of the needle bar and its angular swinging motion on a vertical plane which is perpendicular to the axis of the needle bar.
  • FIGURE 3a is a perspective view of a stitch-formation mechanism which utilized an eccentric-needle needle-bar according to this invention.
  • FIGURE 4 is a perspective view of a mechanical unit which imparts an elliptical or oval movement to a thread-guide of a hosiery linking machine.
  • FIGURE 1 discloses a needle bar, 1, mounted in a clamp 3. Said clamp can be tightened with a threaded-pin tightening device having a threaded pin 4, whereas a small cylinder 2 acts as an abutment for the front end (as viewed in FIG. 1) of the needle bar 1.
  • a needle, 6, is'
  • a needle-carrying block 5 integrally mounted in a needle-carrying block 5 (the needle being held in fixed position, for example, by a screw which has not been shown to simplify the drawing), and said needle-carrying block is firmly fastened to the clamp 3.
  • FIGS. 1 and 2 of the accompanying drawings is not to be construed as a limitation of the scope of the invention: as a matter of fact, the mechanical means adapted to vary the eccentricity of the needle with respect to the needle-bar can be selected among a wide variety: for example, instead of the combination clamp-blockmeedle bar, a needle-carrier can be provided, which is mounted on a small slide adapted to glide on ways integral with the front end of the needle bar, while a set screw, properly located, could serve to lock the whole assembly in the position which corresponds to the preselected eccentricity.
  • FIGURE 3 clearly shows the movements imparted to the needle. More accurately, the line la, the reference numeral being the same adopted for the longitudinal center line of the needle bar 1, denotes the reciprocal movement of the needle, whereas thesector having the center angle alpha defines an arc AB which is the arcuate path on which the needle point travels during a partial alternating half-rotation, said path corresponding to one half of the inter-pin gap or machine gauge.
  • the center angle alpha is generally in the order of magnitude of said value being, however, given by way of suggestion only.
  • FIGS. 3a and 4 hereof A PRACTICAL EXAMPLE OF APPLICATION OF THE INVENTION
  • a practical application of the inventive device to a linking machine in which the needle is mounted externally to the pin dial will be described.
  • the dial has been shown only diagrammatically, but in a manner which is largely sufficient to give a clear understanding of the invention.
  • the head 101 of the linking machine arm carries the stitchforming mechanism.
  • Said device comprises a needle, 102, eecentrically mounted on its needle-bar, 103. It will be observed that the longitudinal center lines of the needle and of the needle-bar, respectively, are not coincident, but they must be rigorously parallel to one another, otherwise the loop-stitch forming movement would be wholly irregular.
  • the needle bar 103 is both slidably and rotatably supported within a supporting member 104 which, as shown in the drawing, can be, for example, a mere extension of the head 101.
  • a crank 105 At the left end, as viewed in FIG. 3a of the needle bar 103, is mounted a crank 105 which imparts the rotary movement of the needle bar 103 about its axis.
  • the crank 105 carries, perpendicularly thereto, an end pin 106 having a spherical extension which is shown in phantom lines in FIG 3a.
  • the pin 106 is mounted on the free end of the crank 105.
  • the spherical end of the pin 106 slides within a longitudinal vertical groove 7 formed in a small block 8.
  • the block 8 is mounted at the end of a lever 9.
  • the lever 9 is pivotally mounted about an intermediate point by means ofa through-pin 10 (not shown in the drawing, which only indicates the axis of said pin), and the pin 10 is downwardly extended until it is received by a block 11.
  • the through-pin 10 is received by a second block 11, which is reciprocable along a cylindrical guide 12.
  • Said cylindrical guide 12 is affixed, at its ends, to the head 101, as shown in the drawings.
  • the lever 9 is connected to one end of a crank 13.
  • the other end of the crank 13 is integral with an arbor 14, which receives a continuous rotary drive from conventional drive-transfer members (e.g. bevel gears) actuated by the usual motor of the linking machine.
  • the arbor 14 continually driven by the machine motor, rotates the crank 13 which, in turn, oscillates lever 7.
  • the latter pivoted at 10, is rotated about its own pin and also receives a reciprocal motion whose stroke is defined by the length of the cylindrical guide 12. This stroke defines the path of reciprocal motion of the needle-bar 103.
  • the pin ofthe lever 9 is extended downwardly into block 11. The rotary movement of the needle-bar about its own axis is effected by the grooved block 8, placed at the free end of the lever 9.
  • the eccentric mounting of the needle on its needle bar eliminates the mechanism and the return spring which have heretofore been required to impart the vertical movement to transfer the needle from one impaling pin to the next one.
  • the advantage achieved thereby is especially conspicuous in linking machines having the needle mounted outside the pin dial.
  • the needle synchronization mechanism can be mounted, for a linking machine having an internal needle, in the cup-shaped space placed internally of the pin dial, whereas the mounting of such a synchronization mechanism would be extremely cumbersome for a linking machine having the needle external to the pin dial, since, in such a case, a rather intricate and costly linkage should be provided.
  • FIGURE 4 of the accompanying drawings a device has been shown which is intended to impart to the thread feeding and guiding unit the elliptical movement which is necessary to form the loop stitch in cooperation with the movement of the needle.
  • the thread feeding and guiding mechanism is mounted. It comprises, in the order given, and from the right to the left as viewed in FIG. 4, a gear pair 15, 17 by which the drive received from the motor of the machine, is transferred to the gear 17 and, therefrom, to the shaft 16 to which the latter gear is keyed.
  • a gear 18 meshing with the gear 19 To the shaft 16 is keyed a gear 18 meshing with the gear 19.
  • the gear 18 has twice the number of teeth of the gear 19, so that the relative gear ratio is 2 to 1.
  • the shaft of the gear 19 (a small portion of it can be seen) is received by a cylindrical supporting member 20 and, at the end of the shaft which rotates in 20, there is an eccentric 21, mounted internally and thus not shown in the drawings.
  • the internal eccentric 21 transfers its drive to the block 22, which carries a cylindrical rod 23.
  • the lower end of the rod 23 cooperates with a balljoint 24 mounted at the end of an arm 25, the latter protruding from a bracket 26.
  • At the upper end of the rod 23 is removably and adjustably mounted an arm 27 which is extended to form the thread-guide proper 28.
  • the tip ofthe thread-guide 28 goes over an oval path whose major axis is nearly horizontal. This movement, in cooperation with the movements of the needle, originates the desired loop stitch.
  • a linking machine equipped with the inventive device as now described is capable of attaining extremely high speeds. which are in any case higher than the working speeds obtainable with the conventional hosiery linking machines.
  • the elimination of a few component parts has led not only to the immediate consequence of first-cost reduction, but also to the elimination of undesirable inertia forces and vibrations.
  • a needle bar mounted for oscillation and for rectilinear reciprocation in the direction of the axis of oscillation of said bar
  • a needle mounted on said bar to extend parallel to but be eccentric of the axis of oscillation ofsaid bar
  • a hosiery linking machine as claimed in claim 2, wherein the means for varying the eccentricity of said needle comprises a block abutting the front end of said needle bar, a clamp for releasably securing said block to said bar, and a block in which said needle is mounted to project forwardly parallel to the axis of said bar, said clamp being releasable to adjust the amount of offset of said needle from the axis of oscillation of said bar.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Knitting Machines (AREA)
US734982A 1967-06-28 1968-06-06 Needle bar for hosiery linking machines Expired - Lifetime US3522780A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1775967 1967-06-28
IT1515868 1968-04-12

Publications (1)

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US3522780A true US3522780A (en) 1970-08-04

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US734982A Expired - Lifetime US3522780A (en) 1967-06-28 1968-06-06 Needle bar for hosiery linking machines

Country Status (5)

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US (1) US3522780A (es)
DE (1) DE1760711A1 (es)
ES (1) ES355100A1 (es)
FR (1) FR1600821A (es)
GB (1) GB1237781A (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2376238A1 (fr) * 1976-12-31 1978-07-28 Mathbirk Ltd Remmailleuse perfectionnee et procede pour assembler des pieces de tricot par un point de chainette

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2376238A1 (fr) * 1976-12-31 1978-07-28 Mathbirk Ltd Remmailleuse perfectionnee et procede pour assembler des pieces de tricot par un point de chainette

Also Published As

Publication number Publication date
GB1237781A (en) 1971-06-30
DE1760711A1 (de) 1971-12-30
FR1600821A (es) 1970-08-03
ES355100A1 (es) 1970-03-01

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