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EP 1 103 643 B1 |
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EUROPEAN PATENT SPECIFICATION |
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Mention of the grant of the patent: |
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09.06.2004 Bulletin 2004/24 |
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Date of filing: 20.11.2000 |
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Improvement to a cotton knitting machine
Verbesserung an Cotton-Wirkmaschine
Perfectionnement à un métier à tricoter du type cotton
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Designated Contracting States: |
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DE ES GB PT TR |
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Designated Extension States: |
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RO |
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Priority: |
23.11.1999 IT BO990630
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Date of publication of application: |
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30.05.2001 Bulletin 2001/22 |
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Proprietor: Tecnotessile S.r.l. |
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40026 Imola (Prov. of Bologna) (IT) |
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Inventor: |
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- Casadio, Alfio
40026 Imola,
(Prov. of Bologna) (IT)
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Representative: Modiano, Guido, Dr.-Ing. et al |
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Modiano & Associati SpA
Via Meravigli, 16 20123 Milano 20123 Milano (IT) |
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References cited: :
US-A- 2 084 732 US-A- 2 629 993
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US-A- 2 491 173
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Note: Within nine months from the publication of the mention of the grant of the European
patent, any person may give notice to the European Patent Office of opposition to
the European patent
granted. Notice of opposition shall be filed in a written reasoned statement. It shall
not be deemed to
have been filed until the opposition fee has been paid. (Art. 99(1) European Patent
Convention).
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[0001] The present invention relates to an improvement to a Cotton knitting machine.
[0002] It is known that in Cotton knitting machines each fabric forming head has a bar,
provided with slots in which sinkers slide, said sinkers distributing the thread among
the needles of a bar which is known as needle bar. Said needles (known as beak needles)
are shaped like hooks provided with a tongue which forms the eye of the needles. With
the movement of the bar, the needles, after engaging the thread and with the tongue
closed by the so-called presser, pass through the fabric and form the stitches (loops)
of a new row.
[0003] In order to form the stitches, the needle bar performs a combined movement, i.e.,
a movement which has a vertical component and a horizontal component. For this purpose,
the needle bar is supported by a first arm of a lever which is pivoted in a rocker-like
fashion to a shaft, known as lowering shaft, on the second arm whereof (arranged substantially
vertically) there is a roller which is actuated by a spring against the profile of
a radial actuation cam which is keyed onto the main shaft, known as eccentric shaft.
The cam has a profile which is partly concentric and partly eccentric. When the roller
runs along the concentric part, the needle bar remains motionless in the raised position;
when instead the roller moves along the eccentric part, the lever lowers the needle
bar.
[0004] In order to move the needle bar horizontally, there is an additional lever system
consisting of an arm which is fixed with one end to the needle bar and is articulated
to a first lever (hereinafter termed linkage for convenience in description) in which
there are usually two recesses adapted to be selected manually in order to engage
on a pivot fixed in a central region on a second substantially vertical lever pivoted
with an upper end on a shaft, known as pressing shaft, which is parallel to the lowering
shaft. Said second lever is provided with a roller which engages, due to the action
of a spring, the profile of a cam which is keyed on the eccentric shaft.
[0005] In a position for the engagement of the pivot in one of the recesses of the linkage,
the needles of the needle bar are in the active position. If the linkage is moved
so that the pivot engages the second recess, the needle bar remains shifted in the
inactive position.
[0006] The length of the stitch, and therefore the density of the knitting, depends on the
position in a horizontal direction of the needles of the needle bar. When the needles
are moved toward the sinkers, the stitch is longer and therefore the fabric is less
dense, i.e., looser.
[0007] In order to adjust the density of the fabric, one acts on the angular position of
the second lever by means of a third lever, keyed on an auxiliary shaft, which acts
on the lower end of the second lever with an adjustable abutment screw.
[0008] Substantial drawbacks are noted in the current structure of Cotton knitting machines.
[0009] First of all, the cam-follower roller, depending on the length of the stitch, is
at a different distance from the cam, i.e., is spaced from the cam along part of its
profile. Accordingly, when the cam makes contact with the roller, an impact occurs;
the higher the speed of the shaft on which the cam is mounted, the more said impact
is violent. Another drawback is that adjustment of the length of the stitch requires
an auxiliary shaft with corresponding adjustable abutments and supports which increase
the complexity of the structure. In particular, in order to pass from a loose stitch
to a tighter stitch or vice versa it is necessary to correct some movements of the
needle bar and possibly of other stitch forming elements by acting on the position
of inserts which determine the profile of the affected cams or by replacing said cams.
The structure of current Cotton knitting machines is increased in complexity and bulk
not only by said auxiliary shaft but also by the presence of the two lowering and
pressing shafts.
[0010] An example of a Cotton knitting machine is available from document US-A-2 084 732.
[0011] The aim of the present invention is therefore to provide an improvement which allows
to greatly simplify the construction of a Cotton knitting machine as regards the means
that allow to adjust the length of the stitch and to form said stitch.
[0012] Within this aim, an object of the present invention is to provide an improvement
which allows to eliminate one of the two shafts onto which the lever systems that
transmit the horizontal and vertical movements of the actuation cams to the needle
bar are articulated.
[0013] This aim and this object are achieved with an improved Cotton knitting machine according
to the present invention, that has the features of claims 1 and 6.
[0014] Further features of the present invention will become better apparent from the following
detailed description of a preferred embodiment thereof, illustrated only by way of
non-limitative example in the accompanying drawings, wherein:
Figure 1 is a schematic view of the lever system for the horizontal and vertical actuation
of the needle bar;
Figure 2 is a schematic view of the needle bar with the needles in various operating
conditions;
Figure 3 is a sectional view of the region of articulation between the first lever
and the second lever; and
Figure 4 is a sectional view, taken along the line IV-IV of Figure 3.
[0015] With reference to Figures 1 and 2, the reference numeral 1 designates the needle
bar, which supports needles 2 that protrude upward.
[0016] The reference numeral 3 designates sinkers which, by being pushed by the couliering
cams by virtue of the undulations, push the thread, distributed in front of them,
between the needles 2 of the bar 1.
[0017] The distribution of the thread occurs when the needles are raised to a level at which
their beaks lie above the sinkers 3.
[0018] An arm 4 is rigidly coupled to the bar 1 of the needles 2, protrudes downward and
has a first lever or linkage 5 articulated to its lower end; said linkage extends
substantially horizontally toward the operator side and ends with an actuation handgrip
6.
[0019] Two recesses 7 and 8 are formed in the lower edge of the linkage 5 and can be individually
engaged on a pivot 9 which can be positioned along a slot 10 formed in a second lever
11 which is keyed, with an upper end, on a shaft 12 having a horizontal axis and supported
so that it can oscillate in the structure of the Cotton knitting machine and constituting
the pressing shaft.
[0020] The slot 10 is shaped like a circular arc which is substantially concentric with
respect to an axis 13 for articulation between the arm 4 and the linkage 5 and lies
predominantly radially with respect to the oscillation axis of the shaft 12.
[0021] The second lever 11 extends downward and supports, in a central position, below the
slot 10, a roller 14 which follows a cam 15 keyed onto a main shaft 16 or eccentric
shaft of the Cotton knitting machine.
[0022] The roller 14 is actuated against the profile of the cam 15 by a traction spring
17 which connects the lower end of the lever 11 to a footing 18 of the Cotton knitting
machine.
[0023] The cam 15 has a profile which is mostly circular and has protrusions in the remaining
part.
[0024] It is evident that as already mentioned, as long as the roller 14 runs along the
circular portion of the cam 15 the second lever 11 remains perfectly inactive, so
that no oscillating movement is transmitted to the needle bar 1. However, when the
roller 14 moves along the portion of the cam 15 that is provided with protrusions,
the needle bar 1 performs an oscillating movement about the rod 18' by way of which
it is articulately connected to the lever system that actuates the vertical movement
(described below). The extent of this oscillation depends on the position of the pivot
9 along the slot 10. If the pivot 9 is arranged in the upper point F of the slot,
the arc traced by the pivot 9 with respect to the axis of the shaft 12 is smaller
than the arc traced when the pivot is at the midpoint M or lower point L.
[0025] In any case, by virtue of the shape of the slot 10 which is concentric to the axis
13, the distance "d" between the axis 13 and the pivot 9 remains constant, so that
the position for the closure of the needles 2 on the part of the press 19 does not
occur only when the pivot 9 is in the midpoint M of the slot 10 but also occurs in
any point along the slot 10. In particular, during the vertical movement of the bar
the needles 2 always close against the press 19 in any position of the pivot 9 that
lies between the point F (thick knitting) and the point L (loose knitting).
[0026] Figure 2 illustrates the needle bar 1 with the needles 2 in the upper and lower positions
of their vertical movement, which correspond to the position of the pivot in the points
L, M and F of the slot 10.
[0027] As can be seen, when the needle bar 1 is in the upper position which corresponds
to the thread distribution position, depending on the position of the pivot 9 along
the slot 10, the needles 2 are closer to, or further spaced from, the bar of the sinkers
3 and therefore are such as to determine the chosen length of the stitch (loop). When
the pivot 9 is in the position L, one has looser knitting, since the bar 1 performs
a smaller oscillation, moving slightly away the needles 2 from the sinkers 3, which
can therefore penetrate between them by a longer extent.
[0028] Vice versa, the position of the needles moves away from the sinkers as the pivot
9 is moved toward the points M and F of the slot 10, so as to reduce the length of
the loops.
[0029] When the needle bar 1 descends, the needles 2 are first closed by the presser 19
and then deposit the stitch onto the secondary lowering sinkers 20. It should be noted
that the two paths L-L and F-F, traced by the needles 2 during the stroke for forming
the tighter and looser stitch, intersect one another at the point of engagement on
the presser 19.
[0030] Another feature of the improvement according to the invention is that at the end
of the descent stroke of the needle bar the position assumed by the needles 2 is such
that when the pivot 9 is in the position F, the needles 2 are closer to the bar of
the sinkers 3 than when the pivot is in the position L. This, with the aid of the
favorable shape of the secondary sinkers 20, produces the correct formation of the
stitch owing to the fact that the lowering is proportional to the length of the loops
formed by the penetration of the sinkers between the needles.
[0031] The described improvement fully achieves the intended aim and object. In addition
to the elimination of the auxiliary shaft and the adjustable abutments for the lever
11, particular importance is given to the fact that the roller 14 remains constantly
in contact with the perimeter of the cam 15 so as to avoid impacts, noise and abnormal
mechanical stresses.
[0032] According to another aspect of the invention, it is possible to use the shaft 12
as a lowering shaft, i.e., for the articulation of the rocker lever 21, which articulately
supports the rod 18' with one arm 22 and is controlled, by means of the other arm
23 and by means of a roller 24 and a spring 25, by a cam 26 which is keyed onto the
eccentric shaft 16.
[0033] Numerous modifications and variations are possible in the practical embodiment of
the invention, and all are within the scope of the inventive concept.
[0034] Figures 3 and 4 illustrate a solution which allows to automate the position of the
pivot 9 along the slot 10. For this purpose, the lever 11, at the level of the region
of articulation to the linkage 5, has a seat 27 which is defined between two portions
28 and 29 of the lever 11. Two slots 30, 31 are provided in the portions 28 and 29
and are concentric to the axis 13. The opposite ends of the pivot 9 are guided in
the slots 30, 31, and said pivot has a central expansion 32 which is guided in the
seat 27.
[0035] The threaded stem 33 is engaged by screwing in the central expansion 32 and constitutes
the output shaft of a motor 34 which is articulated to the lever 11 along an axis
35 which is parallel to the pivot 9.
[0036] The opposite ends of the pivot 9 protrude out of the slots 30, 31 in order to be
able to engage recesses 36, 37 which are formed in two respective arms 38, 39 into
which the linkage 5 is divided in order to externally wrap around the portions 28,
29 of the lever 11.
[0037] From the above description it is evident that by actuating the motor 34 the pivot
9 is moved along the slots in order to adjust its position with respect to the shaft
12 and therefore adjust the oscillation of the needle bar 1.
[0038] In another embodiment, the pivot 9 is stationary on the lever 11 and the slot 10
is provided in the arm 4 concentrically to the pivot 9. In this case, the axis 13
is preset to be adjusted along the slot 10.
[0039] The disclosures in Italian Patent Application No. BO99A000630 form the basis from
which this application claims priority.
[0040] Where technical features mentioned in any claim are followed by reference signs,
those reference signs have been included for the sole purpose of increasing the intelligibility
of the claims and accordingly such reference signs do not have any limiting effect
on the scope of each element identified by way of example by such reference signs.
1. An improved Cotton knitting machine, wherein the needle bar (1) is actuated by a lever
system which comprises an arm (4) which is fixed to the needle bar and is articulately
connected to a first lever (5) provided with recesses (7, 8) for engagement to a pivot
(9) which is fixed on a second lever (11) which is radial with respect to a horizontal
supporting shaft (12) and is controlled by an actuation cam (15) by way of a roller
(14) which is urged onto the profile of said cam by elastic means (17), characterized in that it further comprises a slot (10), said slot (10) being formed on said second lever
(11) concentric to an articulation axis (13) of said first lever (5) in said arm (4)
and said pivot (9) being positionable in said slot (10) so as to produce an oscillation
of said arm (4), by action of said first lever (5), according to a preset criterion.
2. The improved knitting machine according to claim 1, characterized in that said a slot (10) is shaped as a circular arc which is concentric to the articulation
axis (13) of said first lever (5) in said arm (4), the extent of said oscillation
of said arm (4) depending on the position of the pivot (9) along the slot (10).
3. The improved knitting machine according to claim 2, characterized in that said pivot (9) is adjustable along said slot (10) by means of an actuator (33,34).
4. The improved knitting machine according to claims 2 or 3, characterized in that said second lever (11) comprises two portions (28, 29) which define, between them,
a seat (27) and in which two respective slots (30, 31) are provided, said slots being
concentric to the axis of articulation of said arm (4) with respect to said first
lever (5), the opposite ends of said pivot (9) being guided in said slots (30, 31),
said pivot being centrally provided with an expansion (32) which is guided in said
seat (27), said opposite ends of said pivot being suitable to engage respective recesses
(36, 37) formed in two respective arms (38, 39) into which said first lever (5) is
divided in order to externally wrap around said portions (28, 29) of said second lever
(11), a threaded stem (33) being engaged by screwing in said central expansion (32),
said stem being actuated by a motor (34) which is articulated on said second lever
(11).
5. The improved knitting machine according to one of the preceding claims, characterized in that said needle bar (1) is actuated with a vertical motion by means of a lever system
which comprises a lever (21) which is pivoted like a rocker on said articulation shaft
(12) of said second lever (11) and is provided with a first arm (22) which is pivoted
to said needle bar (1) and with a second arm (23) which is controlled by an actuation
cam (26).
6. An improved Cotton knitting machine according to claim 1, modified in that the slot
(10) is provided in the arm (4) concentrically to the pivot (9) that is stationary
fixed on the second lever (11), the articulation axis (13) between said arm (4) and
said first lever (5) being adjustable along a said slot (10).
7. The improved Cotton knitting machine according to claim 4, characterized in that said actuator comprises the threaded stem (33) that is engaged by screwing in the
central expansion (32) provided at said pivot (9) and the motor (34), said threaded
stem (33) constituting the output shaft of said motor (34) actuation whereof producing
movement of the pivot (9) along the slots (30,31) provided in said second lever (11).
8. The improved Cotton knitting machine according to one or more of the preceding claims,
characterized in that said slot (10) comprises a midpoint (M) an upper point (F) and a lower point (L),
positioning of said pivot (9) at the lower point (L) of the slot (10) providing loose
knitting and positioning of the pivot (9) at the upper point (F) of the slot (10)
providing thick knitting.
1. Verbesserte Cotton-Strickmaschine, bei der die Nadelbarre (1) über ein Hebelsystem
betätigt wird, das einen Arm (4) aufweist, der an der Nadelbarre befestigt und beweglich
mit einem ersten Hebel (5) verbunden ist, der Ausnehmungen (7, 8) zum Ineingrifftreten
mit einem Bolzen (9) aufweist, der in einem zweiten Hebel (11) befestigt ist, der
radial zu einer horizontalen Stützwelle (12) verläuft und von einem Betätigungsnocken
(15) über eine Rolle (14) gesteuert ist, die über Federmittel (17) auf das Profil
des Nockens gedrückt wird, dadurch gekennzeichnet, dass sie weiterhin einen Schlitz (10) aufweist, der in dem zweiten Hebel (11) konzentrisch
zu einer Drehachse (13) des ersten Hebels (5) in dem Arm (4) ausgebildet ist, der
Bolzen (9) ist in dem Schlitz (10) anordbar, um ein Hin- und Herschwingen des Armes
(4) aufgrund der Bewegung des ersten Hebels (5) gemäß eines eingestellten Kriteriums
zu bewirken.
2. Verbesserte Strickmaschine nach Anspruch 1, dadurch gekennzeichnet, dass der Schlitz (10) wie ein Kreisbogen geformt ist, der konzentrisch zu der Drehachse
(13) des ersten Hebels (5) in dem Arm (4) verläuft, das Maß des Hin- und Herschwingens
des Armes (4) ist abhängig von der Stellung des Bolzens (9) entlang des Schlitzes
(10).
3. Verbesserte Strickmaschine nach Anspruch 2, dadurch gekennzeichnet, dass der Bolzen (9) über einen Aktuator (33, 34) entlang des Schlitzes (10) einstellbar
ist.
4. Verbesserte Strickmaschine nach Anspruch 2 oder 3, dadurch gekennzeichnet, dass der zweite Hebel (11) zwei Abschnitte (28, 29) aufweist, die zwischen ihnen einen
Sitz (27) ausbilden und in denen zwei entsprechende Schlitze (30, 31) vorgesehen sind,
diese Schlitze verlaufen konzentrisch zu der Drehachse des Armes (4) in Bezug auf
den ersten Hebel (5), die gegenüberliegenden Enden des Bolzens (9) sind in den Schlitzen
(30, 31) geführt, der Bolzen ist zentral mit einer Ausbauchung (32) versehen, die
in dem Sitz (27) geführt ist, die gegenüberliegenden Enden des Bolzens sind geeignet,
um in die entsprechenden Ausnehmungen (36, 37) einzugreifen, die in den jeweiligen
Armen (38, 39) ausgebildet sind, in die der erste Hebel (5) aufgeteilt ist, um von
außen die Bereiche (28, 29) des zweiten Hebels (11) zu umfassen, ein mit einem Gewinde
versehener Schaft (33) steht mittels Verschrauben in der zentralen Ausbauchung (32)
in Eingriff, der Schaft wird durch einen Motor (34) betätigt, der gelenkig an dem
zweiten Hebel (11) befestigt ist.
5. Verbesserte Strickmaschine nach einem der voranstehenden Ansprüche, dadurch gekennzeichnet, dass die Nadelbarre (1) in einer vertikalen Bewegung über ein Hebelsystem betätigt wird,
das einen Hebel (21) aufweist, der wie ein Kipphebel an der Drehwelle (12) des zweiten
Hebels (11) drehbar gelagert ist und mit einem ersten Arm (22), der drehbar an der
Nadelbarre (1) gelagert ist, und mit einem zweiten Arm (23) versehen ist, der durch
einen Betätigungsnocken (26) gesteuert ist.
6. Verbesserte Cotton-Strickmaschine nach Anspruch 1, dadurch verändert, dass der Schlitz
(10) in dem Arm (4) konzentrisch zu dem Bolzen (9) angeordnet ist, der stationär an
dem zweiten Hebel (11) befestigt ist, die Drehachse (13) zwischen dem Arm (4) und
dem ersten Hebel (5) ist entlang des Schlitzes (10) einstellbar.
7. Verbesserter Cotton-Strickmaschine nach Anspruch 4, dadurch gekennzeichnet, dass der Aktuator den mit einem Gewinde versehenen Schaft (33), der durch Verschrauben
in der zentralen Ausbauchung (32) des Bolzens (9) in Eingriff steht, und den Motor
(34) aufweist, dieser mit einem Gewinde versehene Schaft (33) bildet die Ausgangswelle
des Motors (34), dessen Betätigung eine Bewegung des Bolzens (9) entlang der Schlitze
(30, 31), die in dem zweiten Hebel (11) vorgesehen sind, hervorruft.
8. Verbesserte Cotton-Strickmaschine nach einem oder mehreren der voranstehenden Ansprüche,
dadurch gekennzeichnet, dass der Schlitz (10) einen Mittelpunkt (M), einen oberen Punkt (F) und einen unteren
Punkt (L) aufweist und die Anordnung des Bolzens (9) an dem unteren Punkt (L) des
Schlitzes (10) eine lockere Strickweise bewirkt und die Anordnung des Bolzens (9)
an dem oberen Punkt (F) des Schlitzes (10) eine feste Strickweise bewirkt.
1. Métier à tricoter perfectionné du type Cotton, dans lequel la barre d'aiguilles (1)
est actionnée par un système de levier qui comporte un bras (4) qui est fixé sur la
barre d'aiguilles et est relié de manière articulée à un premier levier (5) muni d'évidements
(7, 8) destiné à venir en prise avec un pivot (9) qui est fixé sur un second levier
(11) qui est radial par rapport à un arbre de support horizontal (12) et est commandé
par une came d'actionnement (15) par l'intermédiaire d'un galet (14) qui est repoussé
sur le profil de ladite came par des moyens élastiques (17), caractérisé en ce qu'il comporte de plus une fente (10), ladite fente (10) étant formée sur ledit second
levier (11) concentriquement à un axe d'articulation (13) dudit premier levier (5)
sur ledit bras (4) et ledit pivot (9) pouvant être positionné dans ladite fente (10)
de manière à produire une oscillation dudit bras (4), par l'action dudit premier levier
(5), conformément à un critère prédéfini.
2. Métier à tricoter perfectionné selon la revendication 1, caractérisé en ce que ladite fente (10) a la forme d'un arc de cercle qui est concentrique à l'axe d'articulation
(13) dudit premier levier (5) sur ledit bras (4), l'étendue de ladite oscillation
dudit bras (4) étant fonction de la position du pivot (9) le long de la fente (10).
3. Métier à tricoter perfectionné selon la revendication 2, caractérisé en ce que ledit pivot (9) peut être ajusté le long de ladite fente (10) au moyen d'un actionneur
(33, 34).
4. Métier à tricoter perfectionné selon la revendication 2 ou 3, caractérisé en ce que ledit second levier (11) comporte deux parties (28, 29) qui définissent, entre elles,
un siège (27) et dans lesquelles deux fentes respectives (30, 31) sont agencées, lesdites
fentes étant concentriques à l'axe d'articulation dudit bras (4) par rapport audit
premier levier (5), les extrémités opposées dudit pivot (9) étant guidées dans lesdites
fentes (30, 31), ledit pivot étant muni centralement d'une partie agrandie (32) qui
est guidée dans ledit siège (27), lesdites extrémités opposées dudit pivot étant adaptées
pour s'engager dans des évidements respectifs (36, 37) formés dans deux bras respectifs
(38, 39) dans lesquels ledit premier levier (5) est divisé afin d'envelopper extérieurement
lesdites parties (28, 29) dudit second levier (11), une tige filetée (33) étant engagée
par vissage dans ladite partie agrandie centrale (32), ladite tige étant actionnée
par un moteur (34) qui est articulé sur ledit second levier (11).
5. Métier à tricoter perfectionné selon l'une quelconque des revendications précédentes,
caractérisé en ce que ladite barre d'aiguilles (1) est actionnée selon un mouvement vertical au moyen d'un
système de levier qui comporte un levier (21) qui pivote comme un culbuteur sur ledit
arbre d'articulation (12) dudit second levier (11) et est muni d'un premier bras (22)
qui pivote sur ladite barre d'aiguilles (1) et d'un second bras (23) qui est commandé
par une came d'actionnement (26).
6. Métier à tricoter perfectionné du type Cotton selon la revendication 1, modifié en
ce sens que la fente (10) est agencée dans le bras (4) concentriquement au pivot (9)
qui est fixé de manière stationnaire sur le second levier (11), l'axe d'articulation
(13) entre ledit bras (4) et ledit premier levier (5) pouvant être ajusté le long
de ladite fente (10).
7. Métier à tricoter perfectionné du type Cotton selon la revendication 4, caractérisé en ce que ledit actionneur comporte la tige filetée (33) qui s'engage par vissage dans la partie
agrandie centrale (32) agencée au niveau dudit pivot (9) et le moteur (34), ladite
tige filetée (33) constituant l'arbre de sortie dudit moteur (34) dont l'actionnement
produit un déplacement du pivot (9) le long des fentes (30, 31) agencées dans ledit
second levier (11).
8. Métier à tricoter perfectionné du type Cotton selon l'une quelconque des revendications
précédentes, caractérisé en ce que ladite fente (10) comporte un point médian (M), un point supérieur (F) et un point
inférieur (L), le positionnement dudit pivot (9) au point inférieur (L) de la fente
(10) fournissant un tricot lâche et le positionnement du pivot (9) au point supérieur
(F) de la fente (10) fournissant un tricot serré.