PatentDe  


Dokumentenidentifikation EP1488031 29.11.2007
EP-Veröffentlichungsnummer 0001488031
Titel FADENKLEMMVORRICHTUNG FÜR RUNDSTRICKMASCHINEN
Anmelder SANTONI S.p.A., Brescia, IT
Erfinder LONATI, Francesco, deceased, IT;
LONATI, Ettore, I- 25121 Brescia, IT;
LONATI, Fausto, I-25128 Brescia, IT;
LONATI, Tiberio, I-25121 Brescia, IT
Vertreter derzeit kein Vertreter bestellt
DE-Aktenzeichen 60223084
Vertragsstaaten AT, BE, BG, CH, CY, CZ, DE, DK, EE, ES, FI, FR, GB, GR, IE, IT, LI, LU, MC, NL, PT, SE, SI, SK, TR
Sprache des Dokument EN
EP-Anmeldetag 17.12.2002
EP-Aktenzeichen 027983444
WO-Anmeldetag 17.12.2002
PCT-Aktenzeichen PCT/EP02/14425
WO-Veröffentlichungsnummer 2003054263
WO-Veröffentlichungsdatum 03.07.2003
EP-Offenlegungsdatum 22.12.2004
EP date of grant 17.10.2007
Veröffentlichungstag im Patentblatt 29.11.2007
IPC-Hauptklasse D04B 15/61(2006.01)A, F, I, 20051017, B, H, EP

Beschreibung[en]
Technical Field

The present invention relates to a thread gripping device in circular knitting machines for hosiery or the like.

Background Art

In circular knitting machines for hosiery or the like, at the end of a knitting process performed with the thread dispensed by a corresponding thread guide at a feed or drop of the machine, the thread guide is moved into a position in which it prevents the needles from engaging the thread and the thread is cut (see for example EP 1 059 376 A ).

The portion of thread that lies between the corresponding thread guide and the end formed by the cut is kept in a position that allows to resume knitting with that thread.

Generally, thread guides are arranged around the needle cylinder just above its upper end, and in order to prevent the needles from engaging the thread the thread dispensing end of said thread guides is raised.

At the upper end of the needle cylinder, just below the dispensing end of the thread guides, when such end is lowered to feed the thread to the needles, there is a circular cutter, which is arranged coaxially to the needle cylinder and has a slightly smaller diameter than the cylindrical surface traced by the needles as a consequence of the rotary motion of the needle cylinder about its own axis. Said cutter is provided with a plurality of teeth and generally rotates at the same speed as the needle cylinder. When a thread guide is raised in order to prevent the needles from engaging the thread and the needles that have engaged said thread are lowered into the needle cylinder, the portion of thread that lies between the thread guide and the last needle that engaged said thread is engaged by a tooth of the cutter and is drawn until said tooth of the cutter encounters a fixed abutment or blade, which cuts the thread.

In the region between the thread guide and the blade, above the needle cylinder, within the cylindrical surface traced by the needles, there is an aspirator port. In practice, the portion of thread that lies between the corresponding thread guide and the tooth of the cutter that has engaged it, before cutting, is placed below the aspirator port, so that after cutting the cut end of said thread portion is aspirated into the aspirator port. In this manner, the portion of thread that lies between the thread guide and the cut end is retained and kept tensioned, so that when the corresponding thread guide is lowered again said portion of thread descends between two contiguous needles, ensuring that said thread is engaged correctly by the first needle that is moved to knit at the feed being considered in order to knit with said thread.

When the thread is elastically extensible and is fed in a pre-tensioned condition, the retention performed by the aspirator port may be insufficient, and the thread, after cutting, might contract and return toward the dispensing end of the thread guide due to elastic reaction, to the point of sliding out of said thread guide, making it impossible to subsequently resume knitting with that thread.

In these cases, and possibly in the case of particular knitting requirements, downstream of the thread guides of a feed along the direction of rotation of the needle cylinder with respect to the thread guides there are thread gripping devices, which are designed to perform a firmer and more reliable retention of the thread when it is cut.

One of the thread gripping devices currently used in circular knitting machines or hosiery knitting machines comprises a supporting element, which is fixed to the structure of the machine that supports the thread guides proximate to a feed or drop. Said supporting element supports at least one elastic lamina element and a thread locking lever, which is pivoted to the supporting element and can rotate in a scissor-like fashion with respect to the elastic lamina element in order to catch the thread directly before it is cut and clamp it between the locking lever and the elastic lamina element.

The locking lever and the elastic lamina element are arranged on planes that are substantially radial with respect to the needle cylinder and are located above the needle cylinder.

The locking lever has, on its lower side, which faces the upper end of the needle cylinder, a lug that forms a shoulder that is directed toward the axis of the needle cylinder.

In order to grip the thread, the locking lever is turned about its own pivoting axis, on its plane of arrangement, which lies substantially radially with respect to the needle cylinder, so that its lower end moves transversely to the path of the thread in order to engage said thread by means of said shoulder and move the thread toward the axis of the needle cylinder and grip it between said locking lever and the elastic lamina element.

Assurance of thread grip is entrusted to the correct engagement of the thread by said shoulder.

If, at the end of the thread feeding step and directly before or during the rotation of the locking lever meant to catch the thread in order to grip it, the thread moves accidentally toward the axis of the needle cylinder, with the gripping device described above the shoulder of the locking lever, in its movement toward the axis of the needle cylinder, cannot engage the thread, and therefore the device is unable to grip the thread.

Disclosure of the Invention

The aim of the present invention is to solve the problem noted above, by providing a device for gripping thread in circular hosiery knitting machines or the like that provides great assurance of thread grip during thread cutting.

Within this aim, an object of the invention is to provide a device that ensures correct thread grip even if, at the end of the thread feeding step or during its engagement for gripping, the thread moves abnormally toward the axis of the needle cylinder.

Another object of the invention is to provide a structurally simple device that can be installed on a wide range of circular hosiery knitting machines or the like.

This aim and these and other objects that will become better apparent hereinafter are achieved by a device for gripping thread in circular hosiery knitting machines or the like, comprising a supporting element that can be fixed to the structure of the machine that supports the thread guides proximate to a drop or feed, above the needle cylinder and proximate to the needle work area, said supporting element bearing at least one elastic lamina element that is arranged on a plane that lies substantially radially with respect to the needle cylinder, said supporting element furthermore supporting a thread locking lever that is pivoted to said supporting element with one of its portions and has a pivoting axis that is orientated substantially at right angles to the plane of arrangement of said elastic lamina element, said locking lever being laterally adjacent to said elastic lamina element and having a grip portion that can engage the thread dispensed by at least one thread guide at the corresponding feed or drop, actuation means being provided for actuating said locking lever for its scissor-like rotation with respect to said elastic lamina element about said pivoting axis for the passage of said locking lever from an inactive position, in which said thread grip portion is spaced from said elastic lamina element in the opposite direction with respect to the axis of the needle cylinder, to an active position, in which said thread grip portion is closer to said elastic lamina element and laterally superimposed thereon, in order to grip the thread between said elastic lamina element and said locking lever, or vice versa, characterized in that said thread grip portion has two mutually opposite shoulders that delimit bilaterally the movement of the thread toward or away from the axis of the needle cylinder.

Brief description of the Drawings

Further characteristics and advantages of the invention will become better apparent from the description of a preferred but not exclusive embodiment of the device according to the invention, illustrated only by way of non-limitative example in the accompanying drawings, wherein:

  • Figure 1 is a partially sectional side elevation view of the device according to the invention, with the locking lever in the active position;
  • Figure 2 is a view, similar to Figure 1, of the device according to the invention, with the locking lever in the inactive position;
  • Figure 3 is a sectional view of Figure 1, taken along the line III-III;
  • Figure 4 is an exploded perspective view of the locking lever;
  • Figure 5 is a sectional view, similar to Figure 3, of the device according to the invention, applied above the needle cylinder of a circular knitting machine or hosiery knitting machine, which is shown only schematically for the sake of simplicity.

Ways of carrying out the Invention

With reference to the figures, the device according to the invention, generally designated by the reference numeral 1, comprises a supporting element 2, which can be fixed to the structure of the machine that supports the thread guides 3, proximate to a drop or feed, above the needle cylinder 4 and proximate to the needle work area 5.

The supporting element 2 supports at least one elastic lamina element 6a and 6b, which is arranged on a plane that is substantially radial with respect to the needle cylinder 4. The supporting element 2 further supports a thread locking lever 7, which is pivoted to the supporting element 2, with one of its portions, about a pivoting axis 7a, which is substantially perpendicular to the plane of arrangement of the elastic lamina element 6a and 6b.

The locking lever 7 is laterally adjacent to the elastic lamina element 6a and 6b and has a grip portion 8, which can engage the thread 9 dispensed at the corresponding feed or drop of the machine.

The device comprises means 10 for actuating the locking lever 7 in order to produce its scissor-like rotation, with respect to the elastic lamina element 6a and 6b, about the pivoting axis 7a for the passage of the locking lever 7 from an inactive position, shown in Figure 2, in which the grip portion 8 of the locking lever 7 is moved away from the elastic lamina element 6a and 6b in the opposite direction with respect to the axis of the needle cylinder 4, to an active position, in which said grip portion 8 is closer to, and laterally superimposed on, the elastic lamina element 6a and 6b, in order to grip the thread 9 between the elastic lamina element 6a and 6b and the locking lever 7 and vice versa.

According to the invention, the grip portion 8 has two mutually opposite shoulders 11a and 11b, which delimit bilaterally the movement of the thread 9 toward or away from the axis of the needle cylinder 4.

Preferably, instead of a single elastic lamina element, which might be constituted by the elastic lamina element 6a, there are two elastic lamina elements 6a and 6b, which are arranged side by side and can flex elastically toward or away from each other.

The locking lever 7, in passing from the inactive position to the active position, wedges itself at least with the grip portion 8 between the pair of elastic lamina elements 6a and 6b.

At least the portion of the locking lever 7 that is meant to wedge itself between the pair of elastic lamina elements 6a and 6b is flat, and at least the region 7b thereof meant to be the first to penetrate between the elastic lamina elements 6a and 6b in passing from the inactive position to the active position is wedge-shaped.

Conveniently, the side of the pair of elastic lamina elements 6a and 6b that is directed toward the locking lever 7 in the inactive position is bent so as to form a guiding flared portion 6c for the wedging of the locking lever 7 between the pair of elastic lamina elements 6a and 6b.

The device is meant to be mounted above the needle cylinder 4, so that the lower side of the locking lever 7, on which the shoulders 11a and 11b are formed, lies above the circular cutter 12 usually provided in circular knitting machines or hosiery knitting machines, and the elastic lamina elements 6a and 6b lie within the cylindrical surface traced by the needles 5 as a consequence of the rotation of the needle cylinder about its own axis.

The locking lever 7, in the inactive position shown in Figure 2, is arranged so that the region located between the shoulders 11a and 11b lies at the path of the thread 9 at the end of its feeding to the needles 5 of the machine, as will become better apparent hereinafter.

The rotation of the locking lever 7 about the pivoting axis 7a, in passing from the inactive position to the active position or vice versa, occurs on a plane that is substantially radial with respect to the needle cylinder 4, so that the lower end of the locking lever 7, on which the shoulders 11a and 11b are formed, moves transversely to the path followed by the thread 9 during its feeding to the needles 5 of the machine.

Conveniently, the shoulders 11a and 11b have an undercut region, which forms a receptacle for retaining the thread 9 so as to assuredly prevent the thread from exiting from the region of the locking lever 7 that is indeed delimited by the shoulders 11a and 11b.

In positioning the device on the machine, the axis 7a for pivoting the locking lever 7 to the supporting element 2 is arranged above the region of mutual lateral overlap of the locking lever 7 with the elastic lamina elements 6a and 6b.

The actuation means 10 comprise a pneumatic cylinder 20, which is connected to, or integrated with, the supporting element 2.

In the illustrated embodiment, the pneumatic cylinder 20 is formed directly within the supporting element 2. More particularly, in the supporting element 2 there is a cylindrical chamber 21, which slidingly accommodates a piston 22, which acts on a region of the locking lever 7 that lies between the pivoting axis 7a and the elastic lamina elements 6a and 6b.

The chamber 21 has an opening that is connected to a supply connector 23, which can be connected selectively to a compressed air line or to a vent in order to produce the translational motion of the piston 22 toward the locking lever 7 or to allow the sliding of the piston 22 in the opposite direction, in a per se known manner.

The passage of the locking lever 7 from the active position to the inactive position, performed by virtue of the actuation of the pneumatic cylinder 20, is contrasted by elastic means, constituted by a spring 24 in which one end is connected to the supporting element 2 and the opposite end is connected to the locking lever 7.

Advantageously, the region 40 of the locking lever 7 that is in contact with the thread 9 during its gripping is made of a material that has a higher friction coefficient, in relation to the thread 9 to be gripped, than the remaining part of the locking lever 7.

Conveniently, said material is constituted by an elastically deformable material, preferably natural or synthetic rubber.

The region 40 is preferably formed by an insert 41, made of said material, which is applied to the body of the locking lever 7 at a suitable recess 42 formed in the side of the locking lever 7 that cooperates with the elastic lamina element 6a in gripping the thread 9.

The insert 41 protrudes slightly from said side of the locking lever, and its surface that protrudes from the side of the locking lever 7 is conveniently blended with the surface of said side of the locking lever 7.

It should be noted that the insert 41 is limited only to the region of the locking lever 7 that makes contact with the elastic lamina element 6a when the thread 9 is gripped, so as to limit the extent of the sliding of the insert 41 against the elastic lamina element 6a and thus limit the wear of the insert 41.

Preferably, the insert 41 also covers the region in which the shoulder 11a is formed.

According to requirements, the device according to the invention can be arranged proximate to the thread guides 3, as shown, or proximate to the thread aspirator port, if provided, which is usually provided in circular knitting machines for hosiery or the like.

For the sake of completeness in description, it should be noted that the locking lever 7 has, on the opposite side with respect to its lower end, in which the shoulders 11a and 11b are provided, an extension 25 that protrudes upward from the supporting element 2 in order to allow, if required, the manual actuation of the locking lever 7.

Furthermore, with reference to Figure 5, downstream of the thread guides 3 along the direction of rotation of the needle cylinder 4 about its own axis there is, in a per se known manner, a blade 26 that cooperates with the teeth of the cutter 12 in cutting the thread 9.

Operation of the device according to the invention is as follows.

During the feeding of the thread 9 to the needles 5, the corresponding thread guide 3 is lowered toward the needles 5 or in any case in a position that allows the needles 5 of the machine to engage the thread 9. In this operating condition, the locking lever 7 can be in the active position, shown in Figure 1, or in the inactive position, shown in Figure 2.

If the locking lever 7 is in the active position, before the end of the step for feeding the thread 9, i.e., before lifting the thread guide 3, the locking lever 7 is moved into the inactive position, shown in Figure 2. At the end of the step for feeding the thread 9, the thread guide 3 is raised or otherwise moved into a position that prevents the needles 5 from engaging the thread, and the thread 9 remains engaged with the last needle fed. The portion of thread 9 that lies between the thread guide 3 and the last needle that engaged it, as a consequence of the movement of the thread guide 3 and of the traction performed by said needle, rises and moves toward the axis of the needle cylinder 4, arranging itself in the space of the locking lever 7 that is delimited by the shoulders 11a and 11b, which limit the possibility of lateral movements of the thread 9. In particular, the shoulder 11b, which is directed away from the axis of the needle cylinder 4 and is located between the axis of the needle cylinder 4 and the thread 9, limits, during this step, the possibility of movement of the thread 9 toward the axis of the needle cylinder 4.

The portion of thread 9 that lies between the thread guide 3 and the last needle that engaged it is caught by a tooth of the cutter 12, which gradually draws it toward the blade 26. Just before the thread 9 undergoes the cutting action of the blade 26, the pneumatic cylinder 20 is discharged, so that by virtue of the action of the spring 24 the locking lever 7 is rotated about the pivoting axis 7a, passing from the inactive position to the active position, i.e., moving with its lower end toward the axis of the needle cylinder 4. As a consequence of this movement of the locking lever 7, the shoulder 11a engages the thread 9 and draws it between the elastic lamina elements 6a and 6b. The thread 9 is thus gripped between the locking lever 7 and the elastic lamina elements 6a and 6b. In particular, the thread is gripped between the elastic lamina element 6a and the locking lever 7.

More particularly, the thread 9 is gripped between the region of the locking lever 7 at which the insert 41 is located and the elastic lamina element 6a. By way of the high friction and the deformability ensured by the insert 41, the thread 9 is retained with absolute assurance even if the thread 9 is constituted by an elastic thread that has a small diameter and is fed in a pre-tensioned condition, and even if the elastic lamina element 6a is not perfectly parallel to the grip portion 8 of the locking lever 7.

When one wishes to resume knitting with the thread retained by the locking lever 7, the thread guide 3 is moved again into a position that is suitable to allow the thread 9 to be gripped by the needles 5, and the locking lever 7 is returned, by way of the actuation of the pneumatic cylinder 20, to the inactive position, in contrast with the action of the spring 24.

In practice, it has been found that the device according to the invention fully achieves the intended aim, since by avoiding abnormal movements of the thread in the direction of the axis of the needle cylinder of the machine during the step in which feeding ends and the thread is engaged, it is capable of gripping the thread with absolute assurance during its cutting.

Furthermore, thanks to the presence of the insert applied to the locking lever, one achieves high reliability in the gripping of small-diameter elastic threads.

The device thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the appended claims; all the details may further be replaced with other technically equivalent elements.

In practice, the materials used, as well as the dimensions, may be any according to requirements and to the state of the art.


Anspruch[de]
Vorrichtung zum Greifen eines Fadens in Strumpf-Rundstrickmaschinen oder dergleichen, umfassend ein Trägerelement (2), das an die Konstruktion der Maschine befestigbar ist, welche die Fadenführer (3) nahe einer Abnahme oder Zuführung, über dem Nadelzylinder (4) und nahe der Arbeitsfläche (5) der Nadel, trägt, wobei das Trägerelement (2) mindestens ein elastisches Blattelement (6a, 6b) hält, das in einer Ebene angeordnet ist, die im Wesentlichen radial zum Nadelzylinder (4) ist, das Trägerelement (2) ferner einen Faden-Arretierhebel (7) hält, der mit einem seiner Teile an dem Trägerelement (2) angelenkt ist und eine Schwenkachse (7a) hat, die im Wesentlichen rechtwinklig zur Anordnungsebene des elastischen Blattelements (6a, 6b) ausgerichtet ist, der Arretierhebel (7) seitlich an dem elastischen Blattelement (6a, 6b) angrenzt und einen Greifabschnitt (8) aufweist, der in den Faden (9) eingreifen kann, der von mindestens einem Fadenführer (3) an der entsprechenden Abnahme oder Zuführung freigegeben wird, Betätigungsmittel (10), die vorgesehen sind, den Arretierhebel (7) für seine in Bezug auf das elastische Blattelement (6a, 6b) scherenähnliche Rotation um die Schwenkachse (7a) zu betätigen, damit der Arretierhebel (7) aus einer inaktiven Position, in welcher der Greifabschnitt (8) in die von der Achse des Nadelzylinders (4) wegweisende Richtung von dem elastischen Blattelement (6a, 6b) beabstandet ist, in eine aktive Position übergeht, in welcher der Greifabschnitt (8) näher dem elastischen Blattelement (6a, 6b) und seitlich diesem überlagert ist, um den Faden (9) zwischen dem elastischen Blattelement (6a, 6b) und dem Arretierhebel (7) oder umgekehrt zu greifen, dadurch gekennzeichnet, dass der Greifabschnitt (8) zwei einander gegenüberliegende Schultern (11a, 11b) aufweist, welche die Bewegung des Fadens (9) in Richtung der Achse des Nadelzylinders (4) oder von dieser weg doppelseitig begrenzen. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Vorrichtung zwei elastische Blattelemente (6a, 6b) umfasst, die nebeneinander angeordnet und aufeinander zu oder voneinander weg elastisch biegsam sind, wobei sich der Arretierhebel (7) selbst bei seinem Übergang aus der inaktiven Position in die aktive Position zumindest mit dem Greifabschnitt (8) zwischen den beiden elastischen Blattelementen (6a, 6b) verkeilt. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass mindestens der Abschnitt des Arretierhebels (7), der sich selbst zwischen den beiden elastischen Blattelementen (6a, 6b) verkeilen kann, flach ist. Vorrichtung nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Abschnitt (7b) des Arretierhebels (7), der sich selbst zwischen den beiden elastischen Blattelementen (6a, 6b) verkeilen kann, keilförmig ist, und dass die Seite der beiden elastischen Blattelemente (6a, 6b), die zum Arretierhebel (7) in der inaktiven Position gerichtet ist, derart gebogen wird, dass sie einen aufgeweiteten Abschnitt (6c) bildet, um das Verkeilen des Arretierhebels (7) zwischen den beiden elastischen Blattelementen (6a, 6b) zu führen. Vorrichtung nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Greifabschnitt (8) des Arretierhebels (7) an der unteren Seite des Arretierhebels (7), die der Oberseite des Nadelzylinders (4) zugewandt ist, ausgebildet wird. Vorrichtung nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Achse (7a), um die der Arretierhebel (7) zu dem Trägerelement (2) geschwenkt wird, oberhalb des Bereichs des seitlichen Überlapps der elastischen Blattelemente (6a, 6b) bezüglich des Arretierhebels (7) angeordnet ist. Vorrichtung nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die einander gegenüberliegenden Schultern (11a, 11b) einen unterschnittenen Bereich aufweisen, der eine Aufnahme zur Aufbewahrung des Fadens (9) bildet. Vorrichtung nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Betätigungsmittel (10) einen pneumatischen Zylinder (20) umfassen, der mit dem Trägerelement (2) verbunden oder in diesem integriert ist, wobei der pneumatische Zylinder (20) mit seinem Kolben (22) auf einen Bereich des Arretierhebels (7) wirkt, um diesen gegenläufig zu elastischen Rücksetzmitteln (24), die den Arretierhebel (7) mit dem Trägerelement (2) verbinden, aus der aktiven Position in die inaktive Position zu überführen. Vorrichtung nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Bereich (40), der den Faden (9) zwischen dem Arretierhebel (7) und dem mindestens einen elastischen Blattelement (6a, 6b) greift, zwischen der zylindrischen Oberfläche angeordnet ist, entlang der die Nadeln im Nadelzylinder (4) und die Achse des Nadelzylinders (4) angeordnet sind. Vorrichtung nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Bereich (40) des Arretierhebels (7), der während des Greifens mit dem Faden (9) in Kontakt steht, aus einem Material besteht, das in Bezug auf den zu greifenden Faden (9) einen höheren Reibungskoeffizienten hat, als der andere Teil des Arretierhebels (7). Vorrichtung nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Material aus einem elastisch verformbaren Material besteht. Vorrichtung nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das elastisch verformbare Material (41) aus Gummi besteht. Vorrichtung nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, dass der Bereich (40) des Arretierhebels (7), der während des Greifens mit dem Faden (9) in Kontakt steht, durch einen Einsatz (41) gebildet wird, der an einer Aussparung (42), die auf der Seite des Arretierhebels (7) ausgebildet ist, welche beim Greifen des Fadens (9) mit dem elastischen Blattelement (6a) zusammenwirkt, an dem Körper des Arretierhebels (7) angebracht ist, wobei der Einsatz (41) von der Seite des Arretierhebels (7) vorsteht. Vorrichtung nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, dass die Oberfläche des Einsatzes (41), die von der Seite des Arretierhebels (7) vorsteht, mit der Seite des Arretierhebels (7) zusammenpasst. Vorrichtung nach einem oder mehreren der vorangehenden Ansprüche, dadurch gekennzeichnet, dass das Material auf den Bereich des Arretierhebels (7) begrenzt ist, der dazu bestimmt ist, mit dem elastischen Blattelement (6a) in Kontakt zu kommen, wenn der Faden (9) gegriffen wird.
Anspruch[en]
A device for gripping thread in circular hosiery knitting machines or the like, comprising a supporting element (2) that can be fixed to the structure of the machine that supports the thread guides (3) proximate to a drop or feed, above the needle cylinder (4) and proximate to the needle work area (5), said supporting element (2) bearing at least one elastic lamina element (6a, 6b) that is arranged on a plane that lies substantially radially with respect to the needle cylinder (4), said supporting element (2) furthermore supporting a thread locking lever (7) that is pivoted to said supporting element (2) with one of its portions and has a pivoting axis (7a) that is orientated substantially at right angles to the plane of arrangement of said elastic lamina element (6a, 6b), said locking lever (7) being laterally adjacent to said elastic lamina element (6a, 6b) and having a grip portion (8) that can engage the thread (9) dispensed by at least one thread guide (3) at the corresponding feed or drop, actuation means (10) being provided for actuating said locking lever (7) for its scissor-like rotation with respect to said elastic lamina element (6a, 6b) about said pivoting axis (7a) for the passage of said locking lever (7) from an inactive position, in which said thread grip portion (8) is spaced from said elastic lamina element (6a, 6b) in the opposite direction with respect to the axis of the needle cylinder (4), to an active position, in which said thread grip portion (8) is closer to said elastic lamina element (6a, 6b) and laterally superimposed thereon, in order to grip the thread (9) between said elastic lamina element (6a, 6b) and said locking lever (7), or vice versa, characterized in that said thread grip portion (8) has two mutually opposite shoulders (11a, 11b) that delimit bilaterally the movement of the thread (9) toward or away from the axis of the needle cylinder (4). The device according to claim 1, characterized in that it comprises two elastic lamina elements (6a, 6b) that are arranged side by side and are elastically flexible toward or away from each other, said locking lever (7), in passing from said inactive position to said active position, wedging itself with at least said thread grip portion (8) between said pair of elastic lamina elements (6a, 6b). The device according to claims 1 and 2, characterized in that at least the portion of said locking lever (7) that can wedge itself between said pair of elastic lamina elements (6a, 6b) is flat. The device according to one or more of the preceding claims, characterized in that the portion (7b) of said locking lever (7) that can wedge itself between said pair of elastic lamina elements (6a, 6b) is wedge-shaped, and in that the side of said pair of elastic lamina elements (6a, 6b) that is directed toward said locking lever (7) in said inactive position is bent so as to form a flared portion (6c) for guiding the wedging of said locking lever (7) between said pair of elastic lamina elements (6a, 6b). The device according to one or more of the preceding claims, characterized in that said thread grip portion (8) of said locking lever (7) is formed on the lower side of said locking lever (7) that faces the top of the needle cylinder (4). The device according to one or more of the preceding claims, characterized in that the axis (7a) about which said locking lever (7) is pivoted to said supporting element (2) is arranged above the region of mutual lateral overlap of said elastic lamina elements (6a, 6b) with respect to said locking lever (7). The device according to one or more of the preceding claims, characterized in that said mutually opposite shoulders (11a, 11b) have an undercut region that forms a receptacle for retaining the thread (9). The device according to one or more of the preceding claims, characterized in that said actuation means (10) comprise a pneumatic cylinder (20), which is connected to said supporting element (2) or integrated therein, said pneumatic cylinder (20) acting with its piston (22) on a region of said locking lever (7) in order to pass from said active position to said inactive position in contrast with elastic return means (24) that connect said locking lever (7) to said supporting element (2). The device according to one or more of the preceding claims, characterized in that the region (40) for gripping the thread (9) between said locking lever (7) and said at least one elastic lamina element (6a, 6b) is arranged between the cylindrical surface along which the needles are arranged in the needle cylinder (4) and the axis of the needle cylinder (4). The device according to one or more of the preceding claims, characterized in that the region (40) of said locking lever (7) that is in contact with the thread (9) during gripping is made of a material that has a higher friction coefficient, in relation to the thread (9) to be gripped, than the remaining part of said locking lever (7). The device according to one or more of the preceding claims, characterized in that said material is constituted by an elastically deformable material. The device according to one or more of the preceding claims, characterized in that said elastically deformable material (41) is constituted by rubber. The device according to one or more of the preceding claims, characterized in that said region (40) of the locking lever (7) that is in contact with the thread during gripping is formed by an insert (41) that is applied to the body of said locking lever (7) at a recess (42) formed on the side of said locking lever (7) that cooperates with said elastic lamina element (6a) in gripping the thread (9), said insert (41) protruding from said side of the locking lever (7). The device according to one or more of the preceding claims, characterized in that the surface of said insert (41) that protrudes from said side of the locking lever (7) is blended with the side of said locking lever (7). The device according to one or more of the preceding claims, characterized in that said material is limited to the region of said locking lever (7) that is meant to make contact with said elastic lamina element (6a) when the thread (9) is gripped.
Anspruch[fr]
Dispositif pince-fil pour métiers à tricoter circulaires d'articles de bonneterie ou analogues, comprenant un élément de support (2) pouvant être fixé à la structure de la machine qui supporte les guide-fil (3) à proximité d'une chute ou d'une amenée, au-dessus du cylindre à aiguilles (4) et à proximité de la zone de travail d'aiguille (5), ledit élément de support (2) supportant au moins un élément de lame élastique (6a, 6b) qui est disposé sur un plan reposant sensiblement radialement par rapport au cylindre à aiguilles (4), ledit élément de support (2) supportant en outre un levier de verrouillage de fil (7) pivoté sur ledit élément de support (2) avec une de ses parties et ayant un axe de pivotement (7a) qui est orienté pour sensiblement à angle droit par rapport au plan de l'agencement dudit élément de lame élastique (6a, 6b), ledit levier de verrouillage (7) étant latéralement adjacent audit élément de lame élastique (6a, 6b) et ayant une partie de saisie (8) pouvant introduire le fil (9) distribué par au moins un guide-fil (3) à l'amenée ou à la chute correspondante, des moyens d'actionnement (10) étant fournis pour actionner ledit levier de verrouillage (7) de façon à le faire tourner à la manière d'un ciseau par rapport audit élément de lame élastique (6a, 6b) autour dudit axe de pivotement (7a) pour faire passer ledit levier de verrouillage (7) d'une position inactive, dans laquelle ladite partie pince-fil (8) est écartée dudit élément de lame élastique (6a, 6b) dans la direction opposée par rapport à l'axe du cylindre à aiguilles (4), vers une position active dans laquelle ladite partie pince-fil (8) est plus proche dudit élément de lame élastique (6a, 6b) et superposée latéralement dessus, afin de saisir le fil (9) entre ledit élément de lame élastique (6a, 6b) et ledit levier de verrouillage (7), ou inversement, caractérisé en ce que ladite partie pince-fil (8) a deux épaulements (11 a, 11 b) mutuellement opposés qui délimitent bilatéralement le mouvement du fil (9) en s'approchant ou s'éloignant de l'axe du cylindre à aiguilles (4). Dispositif selon la revendication 1, caractérisé en ce qu'il comprend deux éléments de lame élastique (6a, 6b) disposés côte à côte et élastiquement flexibles lorsqu'ils sont approchés ou éloignés l'un de l'autre, ledit levier de verrouillage (7), lorsqu'il passe de ladite position inactive à ladite position active, s'enfonçant lui-même avec au moins ladite partie pince-fil (8) entre ladite paire d'éléments de lame élastique (6a, 6b). Dispositif selon l'une des revendications 1 et 2, caractérisé en ce qu'au moins la partie dudit levier de verrouillage (7) pouvant s'enfoncer elle-même entre ladite paire d'éléments de lame élastique (6a, 6b) est plate. Dispositif selon une ou plusieurs des revendications précédentes,

caractérisé en ce que la partie (7b) dudit levier de verrouillage (7) pouvant s'enfoncer elle-même entre ladite paire d'éléments de lame élastique (6a, 6b) a une forme de cale, et en ce que le côté de ladite paire d'éléments de lame élastique (6a, 6b) dirigé vers ledit levier de verrouillage (7) dans ladite position inactive est incurvé pour former une partie évasée (6c) pour guider l'enfoncement dudit levier de verrouillage (7) entre ladite paire d'éléments de lame élastique (6a, 6b).
Dispositif selon une ou plusieurs des revendications précédentes,

caractérisé en ce que ladite partie pince-fil (8) dudit levier de verrouillage (7) est formée sur le côté inférieur dudit levier de verrouillage (7) faisant face à la partie supérieure du cylindre à aiguilles (4).
Dispositif selon une ou plusieurs des revendications précédentes,

caractérisé en ce que l'axe (7a) autour duquel ledit levier de verrouillage (7) est pivoté par rapport audit élément de support (2) est disposé au-dessus de la région du recouvrement latéral mutuel desdits éléments de lame élastique (6a, 6b) par rapport audit levier de verrouillage (7).
Dispositif selon une ou plusieurs des revendications précédentes,

caractérisé en ce que lesdits épaulements (11a, 11b) mutuellement opposés ont une région amoindrie formant un réceptacle pour retenir le fil (9).
Dispositif selon une ou plusieurs des revendications précédentes,

caractérisé en ce que lesdits moyens d'actionnement (10) comprennent un cylindre pneumatique (20) qui est relié audit élément de support (2) ou intégré à lui, ledit cylindre pneumatique (20) agissant avec son piston (22) sur une région dudit levier de verrouillage (7) afin de passer de ladite position active à ladite position inactive par opposition à des moyens de retour élastique (24) qui relient le levier de verrouillage (7) audit élément de support (2).
Dispositif selon une ou plusieurs des revendications précédentes,

caractérisé en ce que la région (40) pour saisir le fil (9) entre ledit levier de verrouillage (7) et ledit au moins un élément de lame élastique (6a, 6b) est disposée entre la surface cylindrique le long de laquelle les aiguilles sont disposées dans le cylindre à aiguilles (4) et l'axe du cylindre à aiguilles (4).
Dispositif selon une ou plusieurs des revendications précédentes,

caractérisé en ce que la région (40) dudit levier de verrouillage (7) qui est en contact avec le fil (9) pendant la saisie est fabriquée à partir d'un matériau ayant un coefficient de frottement plus élevé, par rapport au fil (9) à saisir, que la partie restante dudit levier de verrouillage (7).
Dispositif selon une ou plusieurs des revendications précédentes,

caractérisé en ce que ledit matériau est constitué d'un matériau élastiquement déformable.
Dispositif selon une ou plusieurs des revendications précédentes,

caractérisé en ce que ledit matériau élastiquement déformable (41) est constitué en caoutchouc.
Dispositif selon une ou plusieurs des revendications précédentes,

caractérisé en ce que ladite région (40) du levier de verrouillage (7) qui est en contact avec le fil pendant la saisie est formée par un insert (41) appliqué sur le corps dudit levier de verrouillage (7) en un renfoncement (42) formé sur le côté dudit levier de verrouillage (7) coopérant avec ledit élément de lame élastique (6a) lors de la saisie du fil (9), ledit insert (41) saillant hors dudit côté du levier de verrouillage (7).
Dispositif selon une ou plusieurs des revendications précédentes,

caractérisé en ce que la surface dudit insert (41) saillant hors dudit côté du levier de verrouillage (7) est unie au côté dudit levier de verrouillage (7).
Dispositif selon une ou plusieurs des revendications précédentes,

caractérisé en ce que ledit matériau est limité à la région dudit levier de verrouillage (7) conçu pour établir le contact avec ledit élément de lame élastique (6a) lors de la saisie du fil (9).






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