CS207091A3 - Thread guide for guiding elastic threads in knitting machines for producing socks, stockings and the like articles - Google Patents

Description

/ -1 * 0

WIRE DRIVER, IN PARTICULAR FOR THE MANAGEMENT OF FLEXIBLE FLEXIBILITIES AND MANUFACTURE OF SOCKS, PUNCHES "Oa:> o * rc rs>

gITg-J in phthemicChPBsYCH ^ TrBkO

~~ 'IO

<Γ - <mN - <1, IS5

Technical Field l "

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a yarn guide, in particular for guiding flexible yarns in knitting machines for the manufacture of socks, stockings and the like, and in particular for medium-diameter circular knitting machines such as underwear, underwear, body stocking and the like.

Background Art

It is known that in a single cylinder circular knitting machine of small and medium diameters, where cutting of the thread is required at the end of the article, a cutting tool is arranged above the needle cylinder and coaxially therewith. More specifically, the cutting tool is essentially constituted by a disk which is rigidly connected to the needle cylinder when it is rotated about its axis in the machines with the rotating cylinder and is provided with a small toothing on the periphery to catch the thread to be cut when it is no longer captured by needles.

Indeed, at the end of the knitting part of the article, there is a wire or a conductor, a thread that has threaded the thread or threads to the needles that knit the part, so that the other needles can no longer grab the thread that has been caught by the last needle and which has been pulled into the respective needle cylinder groove. the needle cylinder is rotated relative to the conductors of the nipple, which is directed to the axis of the needle cylinder due to the rotation of the needle cylinder. The yarn is aligned along the cutting tool and is captured by its toothing opposite the inner side of the needle cylinder.

The opposite cutting edge is arranged downstream of the yarn feed and is formed by a plate which is above the cutting tool in the toothing region and cuts the yarn when the toothing that has caught it gets. s to said board.

A suction nozzle is disposed between the opposite cutting edge and the yarn supply and directed against the upper surface of the cutting tool. Due to the steady flow of air, the nozzle retains the end supplied by the respective yarn guide when the yarn is cut in order to return to the yarn guide and to avoid entanglement

-2- with other threads being fed. The suction nozzle is arranged close to the yarn feed to keep the yarn in the radial direction with respect to the needle cylinder to facilitate engagement by the yarn heaters when the yarn guide is again reduced, i.e. at the start of a new line of knitwear for which the said yarn is required. the use of resilient yarns causes problems with retention of the suction nozzles, especially when the yarn is subjected to tensioning during knitting. In this case, after the cutting operation of the cutting tool, the yarn is shortened due to elasticity and returned to the yarn guide, since the suction nozzle does not force the yarn enough to overcome the yarn elastic reaction . In yarns having a high degree of elasticity, the yarn shortening may be such as to cause a complete yarn leakage from the respective yarn guide, which requires the machine to stop and the operator to recover the correct yarn feed. Cutting and clamping units are used to solve this problem. These units are positioned above the cutting tool and work alternately with the cutting tool when a flexible thread needs to be cut. Although solving the problem of a possible yarn yarn of the respective yarn guide, these cutting yarn drawers have the disadvantage of being in need of action. controls that must: be controlled by the machine controller, generally by a microprocessor, which makes the machine programming slo- ------------ -not. ------ ....... ------- ........ ----------------- ... .. .__

Since the cutting and clamping units are arranged with a cutting tool, they can also cause confusion during design because they cause problems in the arrangement of the other elements required for the operation of the machine in that it. the area it creates again. problems during maintenance interventions on the machine. SUMMARY OF THE INVENTION It is an object of the present invention to eliminate the above-described shortcomings by providing an improved yarn guide that effectively prevents yarn leakage without cutting through the need for cutting and clamping units arranged above the cutting tool. , which allows a cutting tool to be used to cut flexible yarns as well as normal yarns.

Another object of the invention is to provide a yarn guide which,

i; · i'í

Because it does not require a cutting unit or a clamping unit, it simplifies the design of the machine and the programming of the electronic control unit that controls its operation.

It is a further object of the invention to provide a yarn guide which allows the low cost of elements required for feeding to be maintained. i

SUMMARY OF THE INVENTION

SUMMARY OF THE INVENTION The present invention solves the problem of providing a yarn guide, in particular for a flexible yarn in a sock knitting machine, which includes a rod having at least one opening in the yarn, which opening extends from the proximal end of the rod, which is adapted to be arranged proximal to the working space of the needles of the knitting machine under which the retaining means adapted to bring about the return of the yarn supplied through said opening is arranged along the path of the thread being watched.

According to a preferred embodiment of the present invention, the yarn guiding means is arranged along the bar and defines a sliding track extending above the support surface arranged in the proximal end of the bar, the catching means being a movement

-P. to or from the support surface for gripping the yarn between the support and the gripping means. . .

According to a further preferred embodiment of the present invention, the securing means comprises a resiliently flexible layer fixed at one end thereof to a portion of the rod arranged above the support portion and disposed in front of said portion along the yarn direction, said second end extending to the support surface and it forms an acute angle with respect to the direction of sliding of the yarn on said support surface.

According to a further preferred embodiment of the invention, the engagement means comprises a member articulated at one end of a portion of the bar arranged above the supporting surface, the second end of the element extending to the supporting surface and arranged by a pivot of an axis parallel to said supporting surface and perpendicular to the sliding direction of the yarn from the supporting surface biasing action of the return means.

According to a further preferred embodiment of the present invention, the return means consists of a magnet fixed to a portion of the rod 4 arranged above the support surface, which magnet is directed to an element of ferromagnetic material for its bias towards the support surface.

According to a further preferred embodiment of the present invention, the end of the element which is directed to the support surface is a lip which forms an acute angle with respect to the sliding direction of the yarn by the supporting surface.

According to a further preferred embodiment of the invention, the return means is a spring. According to a further preferred embodiment of the invention, the guide means comprises channels defined in the rod opposite the said supporting surface along the sliding direction and in the same position by the said opening. BRIEF DESCRIPTION OF THE DRAWINGS;

The invention is illustrated in the drawings, wherein FIG the feature of the two yarn guides of the present invention at the first φ? Fig. 2 is a perspective view of the yarn guide according to the present invention; 3 and 4, the yarn guide conductors 1 of the present invention are shown in a first embodiment illustrating its operation; FIG. 5 is a perspective view of the yarn guide according to the present invention; looking at the yarn guide according to the present invention in the second; and FIGS. 7 and 7 are side views of the yarn guide shown; 5, which illustrate its operation. EXAMPLES OF THE INVENTION

The yarn guide 1,1a in both embodiments includes a rod 2,2a which is mounted in the central portion rotatably through a pin hole 3.3a in the carrier 4 arranged "laterally to the circular cylinder needle bar". In the vicinity of the distal end 6.6a of the rod 2.2a, a passage 8.8a is formed for the thread 2 to be fed to the needles 4. Also, the tab 2.2a is directed towards the needle cylinder. 2 to the working space of the needles 7

According to the present invention, trays 10, 10a are provided along the yarn path 2a and 2.2a, which are actuated when the yarn return occurs through the passage 8a. More specifically, the yarn guide rod 2 in the first embodiment of the invention has a guide means for a yarn 2 which is substantially constituted by the channels 11 and 12 defined in the rod body 2 in a straight line and through the passage 8. 12 defines, together with the passage 8, a sliding path for the yarn which is fed through the passage 8. In this first embodiment of the invention, the retainer comprises an element 15 which at its upper end is hinged to a portion 16 of the rod 2 which is disposed above the supporting surface 11a of the lower end of the element. 15 is directed to the support surface 13i. The element 15 may be deflected about an axis 17 arranged above the support surface 13 and parallel to it and perpendicular to the sliding direction of the yarn 2 according to arrow 14.

Due to this arrangement, the lower end of the element 15 can be pivoted about the axis 17Z to move to and from the supporting surface 13. The movement of the element 15 in a direction opposite to the distal end 6 of the yarn guide is limited by the presence of a part, and a return means 15 acts on the yoke and biases it towards the distal end 6.

The element 15 is made of ferromagnetic material. The return means may be formed in a conventional manner as in FIG. . in the example shown, permanent magnet 1.8. associated with parts 15, rods 2 and directed to member 15. * 1

The lower end of the element 15 has a chamfer 12 on the side opposite to the distal end 6 of the rod 2, which forms a sharp hinge with respect to the yarn sliding direction 2 on the support surface 13; In this way, when the nit-2 is drawn by the needles that catch it, the actual contact of the thread 2 keeps the lower end of the element 15 spaced apart from the carrier. the return of the yarn 2 in the direction of feed causes deflection of the element 15 in the opposite direction, thereby causing the lower end of the element 15 to approach the support surface 13 and the yarn 2 θ to be compressed and thus, it is clamped between the element 15 and the supporting surface 13. The deflection of the element 15 during the return of the thread 23 is caused not only by the contact with the thread 2 but also by the action of the magnet 18.

The magnet 18 may be replaced by a simple return spring which is not shown for the sake of clarity of the drawing. -6-

In a second embodiment of the invention, the channels 11a and 12a and the support surface 13a are defined in the rod 2a in a manner similar to the first embodiment described above.

In a second embodiment of the invention, the retainer is formed as a flexibly flexible layer 15a, which at its upper end is attached to a portion 11a of the rod 2a arranged on the support surface r13a and in front of the support surface 13a in the direction of sliding of the thread 2 by the arrow J4. In this way, the progress of the yarn 2 in the direction of the arrow 14 is enabled by the elastic swiveling of the elastically flexible layer 11 due to its contact with the yarn 9, while the return of the yarn 2 in the opposite direction causes the yarn 2 to be caught which is a flexible flexible layer. 15 is pressed against the supporting surface 13a.

The yarn guide of the present invention can be used as a replacement for conventional yarn guides, for example through electromagnetic actuator 20 and spring 21. The operation of the yarn guide according to the present invention is evident from the above description and drawings, and in particular it is clear that cutting the yarn 2 on the machine it is not necessary to provide the device for clamping the yarn 2 to be withdrawn, because its return to the yarn guide is prevented by the element 15 or the flexible flexible layer 15a by a straight thread guide. Especially in the case of very elastic yarns, because of the small distance between the yarn closure point and the yarn dispensing end, the yarn 2 which remains out of the yarn guide is long enough to be caught by the pyramid? ‘........ J at the beginning of a new knit. In practice, it has been observed that the yarn guide according to the present invention!

of the present invention fully achieves the intended aim, since it eliminates the use of cutting and clamping units to date.

»V for flexible threads while effectively preventing leakage of thread from the thread.

A number of variations can be made in the yarn guide described above, all of which are within the spirit of the present invention, all yarn guide components may be replaced by technically equivalent elements.

INDUSTRIAL APPLICABILITY The present invention can be used in a wide range of textile industry on circular knitting machines for a wide range of products and yarns, especially flexible yarns.

Claims (7)

TV —in v -7- • o PATBLiTiT TJ X5> O io. • O - to3 ΓΟ ΓΟ! - o O <C | s | B3®f m> o <r ~ - <n felt &amp; 1. Yarn guide, in particular flexible; yarn in the manufacture of socks, stockings and the like, comprising at least one passageway therein for a yarn which extends from the proximal to the distal end of the rod, adapted to be arranged adjacent to the workspace of the needles of the knitting machine, A gripping means adapted for said return operation is provided by the rod returning the yarn introduced by said passage. Thread guide according to claim 1, characterized in that the yarn guide means is arranged along the bar and defines a sliding runway extending above the support surface arranged in the proximity of the distal end of the bar, wherein the gripping means is movable or from the yarn gripping surface between the support surface and the retaining means. 3. "yarn guide according to Dods 1 and 2, characterized in that the retaining means comprises a resiliently flexible layer fixed at one end thereof to a portion of the rod arranged above the supporting surface and arranged in front of said portion along the yarn sliding direction, wherein said layer extending with its second end to the support surface and forming an acute angle with respect to the sliding direction of said yarn support surface. The yarn guide according to any one of claims 1 to 3, characterized in that the retaining means comprises an element hinged at one end thereof to a portion of the rod arranged above the support surface, the other end of the element extending to the support surface and being pivotable about an axis parallel to it with said support surface and perpendicular to the yarn sliding direction away from the support surface for the biasing action of the return means. A yarn guide according to any one of claims 1 to 4, characterized in that the return means consists of a magnet fixed to a rod portion arranged above the support surface, which magnet is directed to the ferromagnetic material element for its direction towards the support surface. A yarn guide according to any one of claims 1 to 5, characterized in that the end of the element which is directed to the support surface is a bevel which forms an acute angle with respect to the sliding direction of the yarn by the supporting surface. 8 Thread guide according to any one of claims 1 to 6, characterized in that the return means is a spring. Thread guide according to any one of claims 1 to 7, characterized in that the guide means comprises channels defined in the rod against said support surface along the yarn sliding direction and in a straight line with said passage. i /! - · &amp;L; FA! Ϊ́- Represents: iý; .1