EP3597807B1 - Machine knitting tool, in particular machine knitting needle - Google Patents

Description

The invention relates to a machine knitting needle for use in a knitting machine, for example a circular knitting machine.

Machine knitting tools are known in different configurations. Machine knitting needles, for example latch needles or compound needles, are moved in the longitudinal direction in a guide or needle channel during a knitting process in a knitting machine. A lock of the knitting machine acts on a foot part of the machine knitting tool in order to position or move the machine knitting tool in its longitudinal direction. In circular knitting machines, the knitting cylinder with the machine knitting needles is rotated relative to the lock in a circumferential direction, or vice versa, and the foot parts of the machine knitting needles are guided in a lock path. Not only does a force act on the foot parts in the longitudinal direction of the machine knitting needle, but also across it in a transverse direction. Other machine knitting tools, such as sinkers or slides of compound needles, are moved or positioned by means of a suitable drive device during knitting in a knitting machine.

In order to meet the requirements of a productive knitting process and, on the other hand, to ensure a long service life, the machine knitting tools must meet a large number of, in some cases, competing conditions. High productivity requires high movement speeds or accelerations of the machine knitting tools. As a result of these accelerations, no excessive signs of wear such as fatigue fractures on the machine knitting tool must occur. Replacing a defective machine knitting tool requires the knitting machine to stop and leads to a loss of productivity. It is just as important that the machine knitting tool can be positioned precisely so as not to cause any errors in the formation of the loop. This positioning accuracy must not be disturbed by impurities that can accumulate in the guide or needle channel, especially in the channel base. In order to do justice to these various boundary conditions, the machine knitting tool as a whole must have a design that takes all aspects into account and fulfills them as well as possible.

In the prior art, a large number of designs of the most varied machine knitting tools have already been proposed. To reduce the weight of the needle, in U.S. 3,464,237 proposed to provide a recess in a foot part of a machine knitting needle and thereby reduce the weight.

U.S. 5,154,069 A discloses a machine knitting needle with a shaft part and a foot part projecting away from the shaft part for moving the machine knitting needle. Between a front end of the machine knitting needle and the foot part, the shaft has a multi-curved, arch-shaped, resilient section. This section is intended to have a dampening effect when accelerations occur. Also are out U.S. 5,231,855 A or DE 69 218 303 T2 Meandering shaft sections are known in order to dampen the influence of jerky accelerations on the machine knitting needle and to avoid damage.

DE 28 20 925 A1 proposes a knitting tool in which the shaft part has at least one bridge, the shaft part being at a distance from the base of the guide channel or needle channel in the region of the bridge. In the area of the bridge, a web section of the shaft part should have a height that is no greater than 1.1 mm or 0.9 mm.

However, the relevant section of the shaft part has no contact with the base of a needle channel of a knitting machine in these sections serving for damping, so that impurities can collect. In addition, with machine knitting tools which have a short overall length, there is the problem that such an arcuate or meandering shaft section reduces the effective working length of the machine knitting tool available for loop formation and holding one or more loops on the shaft.

Out EP 2 799 603 A2 it is known that the lock of a circular knitting machine not only serves to move the machine knitting needle, but also supports the machine knitting needles against centrifugal forces when the knitting cylinder rotates radially outward.

DE 2 229 858 A discloses a latch needle for knitting machines. The latch needle has two foot parts which are arranged at a distance from the latch needle in the longitudinal direction and a separating zone which is arranged between them and extends down to below the level of the upper edge of the needle shaft. In this foot part section of the latch needle, in which the two foot parts are arranged, can additionally on the underside grooves of the needle shaft are present. In addition, grooves can be present in the transition from the foot parts to the shaft part on the upper side of the needle shaft. This weakening of the needle shaft in the foot section is intended to dampen shocks caused by the acceleration of the needle, which is introduced via the foot sections.

GB 2074614 A describes a punched knitting needle that is designed as a latch needle. The latch needle has recesses that penetrate transversely through the shaft and are delimited all around by webs remaining on the shaft.

U.S. 4,036,036 A relates to a latch needle with a shaft which is pierced in the transverse direction by at least one slot and / or at least one hole in order to achieve a damping effect.

DE 3843420 C1 describes a punched trick tool with a shaft having an opening. Vibration-damping material, for example polyamide, is arranged in the opening.

DE 2610078 A1 relates to a latch needle with a shaft assembled from several shaft parts. The shaft parts are positively connected to one another.

EP 1 229 158 A1 discloses a compound needle with a needle shaft and a slide which is mounted displaceably guided in a longitudinal recess of the needle shaft.

Based on the prior art, it can be considered a task of the present invention are considered to improve the guidance and positioning of the machine knitting needles in the knitting machine and thereby provide sufficient damping of initiated shocks or vibrations.

This object is achieved by a machine knitting needle with the features of patent claim 1.

The machine knitting needle according to the invention is a latch needle. The machine knitting needle has a shaft part which extends in a longitudinal direction and which has a bearing surface on an underside. The support surface is set up to rest on the base of a guide or needle channel in a knitting machine. The shaft part has a front end to which a front end section is connected. In the front end section the shaft part has a means for loop formation, in particular a needle hook. The shaft part has a rear end opposite the front end portion in the longitudinal direction. Outside the front end section, the support surface extends continuously to the rear end within a single plane - wherein the support surface can merge with a radius into the rear end. The shaft part has a total length from the front end to the rear end which is preferably a maximum of 100 mm. The front end section, which is set up for loop formation, has a maximum length of 5% of the total length of the shaft part. The front end section preferably does not extend beyond the tongue bearing and ends, for example, between the needle hook and the tongue bearing.

The machine knitting needle has a front guide section in which a guide arm protrudes in a height direction away from the shaft part, and a rear guide section in which a further guide arm protrudes in the height direction away from the shaft part. Between the two guide sections there is a foot section in which a foot section protrudes from the shaft section in the vertical direction. The foot part is designed to work together with a lock or another drive of a knitting machine in order to move the machine knitting needle in the longitudinal direction within a needle or guide channel of the knitting machine.

Each guide arm has an arm limb which, with the area of the shaft part arranged below it in the vertical direction, delimits an intermediate space which is open in the longitudinal direction on the side facing away from the foot part. The boom leg can extend parallel to the longitudinal direction or at an angle of inclination of less than 15 degrees or 10 degrees relative to the longitudinal direction. The guide arm and the shaft part form, so to speak, a fork-shaped area of the machine knitting needle in the respective guide section.

Due to the inventive design of the machine knitting needle with a continuous flat support surface, which is in particular free of elevations or depressions or perforations, there is no space available in the area of the needle shaft in which impurities can collect and the alignment or guidance of the machine knitting needle in the guide channel or Can affect the needle channel. It also avoids that by an accumulation of dirt, increased friction or increased wear and tear occurs when the machine knitting needle moves in the guide channel. The machine knitting needle is designed and suitable in particular for knitting a staple yarn or a cotton yarn. With such yarns, a particularly high level of soiling occurs in the knitting machine due to yarn remnants from the staple fiber yarn. The machine knitting needle is therefore particularly insensitive to such soiling and is particularly suitable for knitting such yarns.

In order to further improve the guidance and positioning accuracy, guide sections are provided on both sides of the foot part or the foot part section, wherein the distance between the guide sections from the foot part or from the foot part section can be the same or different. For example, both guide sections can directly adjoin the foot section. In one embodiment, one of the guide sections and in particular the front guide section can directly adjoin the foot section, while an intermediate section can be located between the other guide section and in particular between the rear guide section and the foot section.

The guide arms support the needle against forces occurring in the vertical direction and / or in a transverse direction which is oriented at right angles to the height direction and at right angles to the longitudinal direction. The intermediate space between the boom leg and the area of the shaft part located therebelow creates a spring-elastic effect when forces act on the boom leg in the vertical direction. These forces therefore do not act directly on the shaft part, but can be at least partially elastically received or supported in the guide arm. This results in very precise guidance and positioning of the machine knitting needle. The refinements can also reduce tilt tendencies about an axis extending in the transverse direction and / or an axis extending in the longitudinal direction.

It is advantageous if each guide arm has a connecting leg which connects the arm leg to the shaft part. The connecting leg can include an angle of inclination with respect to the longitudinal direction which has an amount in the range from approximately 20 degrees to approximately 90 degrees, preferably from approximately 25 degrees to approximately 65 degrees. The connecting leg of each guide arm preferably extends obliquely from the shaft part and at the same time away from the foot part.

In a preferred exemplary embodiment, each guide arm in a transition section to the shaft part has a width which is at least twice as large as the maximum shaft height of the shaft part. The width of the guide arm is measured lengthways in the transition section. The shaft height of the shaft part is the distance between the bearing surface on the underside and an upper side of the shaft part that is opposite in the vertical direction. In particular, the width of the guide arm in the transition section is twice as large as the shaft height in the respective guide section.

In one embodiment, the boom leg can have a width at right angles to its direction of extension which is as large as the shaft height of the Shank part in the respective guide section. The shaft height is preferably constant in each guide section.

The boom leg of the rear guide boom has a free end which has the same position in the longitudinal direction as a rear end of the shaft part. The arm leg of the rear guide arm and the shaft part are flush with one another. It is thereby achieved that the guide sections or the guide arms have the greatest possible distance from one another in the longitudinal direction without increasing the overall length of the machine knitting needle. In one embodiment, the distance between the front guide arm and the foot part can be smaller than the distance between the rear guide arm and the foot part. The front guide arm can be arranged as close as possible to the foot part in order to maximize an effective working length of the shaft part from the front end section to the front guide arm. A front shaft portion of the shaft part can be connected to the front end portion, which is at least partially protruded from the front guide arm. This front shaft section is ready for receiving a loop, which can slide along the front shaft section in the front end section and in the front shaft section up to the connection point of the front guide arm with the shaft part, with a maximum of about half the length of the front shaft section for receiving stitches in conventional knitting processes is used. In one embodiment, half the length of the front shaft section is set up to receive stitches.

In a preferred embodiment, the foot part can have a transition area to the shaft part Have foot part base, the length of which in the longitudinal direction is smaller than the length of an upper foot part area of the foot part adjoining in the height direction. The foot part base can for example form a constriction of the foot part in the longitudinal direction. This measure makes it possible to reduce a load which acts on the foot part when a force is introduced to accelerate the machine knitting needle in the longitudinal direction. According to the invention, the damping effect can be further improved in that the bearing surface rests over the entire or almost the entire length of the shaft part in the guide channel of the knitting machine.

It is advantageous if a base height of the foot part base is greater than a shaft height in the guide sections. Additionally or alternatively, the base height can be smaller than the guide jib height of the guide jib. The guide boom height is the maximum distance between an upper side of the boom leg and the underside of the shaft part. The base height is the height of the foot part base starting from the adjoining upper side of the shaft part. The foot part base and the adjoining upper foot part area merge at the point at which the foot part has reached its maximum length in the longitudinal direction.

In a preferred embodiment, the foot part base has a curved section on each of its two longitudinally opposite sides. The curved section facing the front guide section can merge directly into the front guide bracket and in particular the connecting leg of the front guide bracket. The rear guide boom is preferred at a distance from the curved section of the foot part base facing it.

At least one or both of the curved sections can have a constant radius of curvature or a changing radius of curvature. The changing radius of curvature can be greatest in the region of the curved section which, viewed in the height direction, adjoins the shaft part.

It is also advantageous if the foot part has at least one foot part recess. The foot part recess can be arranged at a distance from the shaft part in the height direction and is located in particular outside the foot part base exclusively in the upper foot part area. The foot part recess, viewed in the vertical direction, can be open on the side opposite the shaft part. The total weight of the machine knitting needle can be reduced by the at least one foot part recess. If the foot part recess extends completely outside of the foot part base, an excessive weakening of the foot part can be avoided, since forces that frequently change in the longitudinal direction act on the foot part to accelerate the machine tool.

In one embodiment, the shaft part in the foot part section can have a shaft part height that is a maximum of 1.1 mm. The shaft part height in one or both guide sections is smaller or at most as large as the shaft part height of the shaft part in the foot part section.

• Figur 1 ein Ausführungsbeispiel einer Maschinenstricknadel in einer schematischen Seitenansicht,
• Figur 2 einen Querschnitt durch einen Schaftteil der Maschinenstricknadel aus Figur 1 gemäß der Schnittlinie II-II in Figur 1,
• Figur 3 eine vergrößerte Teildarstellung eines Abschnitts der Maschinenstricknadel aus Figur 1 im Bereich eines vorderen Führungsabschnitts und eines sich daran anschließenden Fußteilabschnitts und
• Figur 4 eine vergrößerte Teildarstellung eines Abschnitts der Maschinenstricknadel aus Figur 1 im Bereich von einem hinteren Führungsabschnitt bis zum Fußteilabschnitt.

Preferred embodiments of the invention emerge from the dependent claims and the description and the drawings. In the following, preferred exemplary embodiments of the invention are explained in detail with reference to the accompanying drawings. Show it:

• Figure 1 an embodiment of a machine knitting needle in a schematic side view,
• Figure 2 a cross section through a shaft part of the machine knitting needle Figure 1 according to section line II-II in Figure 1 ,
• Figure 3 an enlarged partial illustration of a section of the machine knitting needle Figure 1 in the area of a front guide section and an adjoining foot section and
• Figure 4 an enlarged partial illustration of a section of the machine knitting needle Figure 1 in the area from a rear guide section to the foot section.

Figure 1 4 shows a side view of an exemplary embodiment of a machine knitting tool 10 in the form of a machine knitting needle 11. The machine knitting needle 11 has a shaft part 12 which extends between a front end 13 and a rear end 14. At the front end 13, the shaft part 12 is designed to form a loop when knitting in a knitting machine. In the exemplary embodiment, the shaft part 12 is shaped into a needle hook 15 at the front end 13. In order to be able to open and close an inner region of the needle hook 15, the machine knitting needle 11 has a closing element 16 in the form of a tongue 17. The tongue 17 is around one The pivot axis A extending in a transverse direction Q is mounted pivotably and can rest with its end region opposite the pivot mounting on the needle hook 15 in order to close the inner region of the hook.

The shaft part 12 extends in a longitudinal direction L. It has a total length xg between the front end 13 and the rear end 14, which, according to the example, is a maximum of 100 mm.

A front end section 18, which is set up for loop formation, adjoins the front end 13 in the area of the needle hook 15. The front end section 18 extends starting from the front end 13 up to the end of the tongue bearing of the tongue 17 at the most. A length x1 of the front end section 18 is preferably at most 5% of the total length xg of the shaft part 12.

A front shaft section 19 of the shaft part 12 directly adjoins the front end section 18. In this area, the shaft part 12 is designed to receive one or more loops through which the shaft part 12 extends during knitting. The front shaft section 19 has a length x2 in the longitudinal direction L which is greater than the length x1 of the front end section 18.

The shaft part 12 of the machine knitting needle 11 has a shaft height z in a height direction H at right angles to the longitudinal direction L and at right angles to the transverse direction Q, which can vary in the longitudinal direction L in different sections of the shaft part 12. The shaft height z is generally in Figure 2 drawn. The shaft part 12 has in the height direction H on an underside, a support surface 20 which extends predominantly in a single plane E and, apart from a roughness, has no projections or depressions with respect to this plane E. Only in the front end section 18 and in a transition radius to or at the rear end 14 can the underside of the shaft part 12 deviate from the extent from the plane E, for example in order to set up the front end section 18 for loop formation, in particular to form the needle hook 15. At least the underside of the shaft part to form the bearing surface 20 is designed so that it extends continuously without a recess within the plane between the foremost point at which the underside of the shaft part lies in plane E and the rearmost point at which the underside of the shaft part lies in plane E E extends.

The shaft part 12 has an upper side 21 on the side opposite the bearing surface 20. The bearing surface 20 and the upper side 21 are connected by two side surfaces 22 which are arranged in the transverse direction Q on opposite sides of the shaft part 12. The shaft part 12 thus has a substantially rectangular cross-section, with the corner areas being able to be rounded or chamfered with a radius ( Figure 2 ). The shaft part 12 can alternatively also have a different cross-sectional contour, for example an elliptical or circular cross-section.

The machine knitting needle 11 has a foot part section 26 in which a foot part 27 projects away from the shaft part 12 in the height direction H. The foot part 27 and the shaft part 12 are integrally formed according to the example. The foot part 27 has one in the height direction H directly the foot part base 28 adjoining the shaft part 12. On the side opposite the shaft part 12, an upper foot part area 29 adjoins the foot part base 28. The foot part base 28 has a shorter length in the longitudinal direction L compared to the upper foot part area 29. The upper foot section 29 defines the maximum length x3 of the foot section 27, and consequently the length x3 of the foot section 26. The upper foot section 29 has a front foot section edge 30 and a rear foot section edge 31, which each extend in the height direction H and in the longitudinal direction L. Are arranged spaced. The distance between the front foot part edge 30 and the rear foot part edge 31 corresponds to the maximum length x3 of the foot part 27. As shown in FIG Figure 1 is illustrated, the foot part base 28 adjoins the two foot part edges 30, 31. The ends of the two foot part edges 30, 31 that adjoin the foot part base 28 thus define the transition point 32 between the foot part base 28 and the upper foot part area 29. The transition point 32 is in the Figures 1 and 2 shown in dashed lines.

The front foot part edge 30 and the rear foot part edge 31 are connected to one another by an upper foot part edge 33. In the exemplary embodiment, the upper foot part edge 33 runs parallel to the longitudinal direction L only in sections. In the upper foot part region 29, a foot part recess 34 is made, which completely penetrates the foot part 27 in the transverse direction Q. In the exemplary embodiment described here, the foot part recess 34 is open in the height direction H on the side opposite the shaft part 12, that is to say it is open at the top. The foot part recess 34 is delimited by a section of the upper foot part edge 33.

As is particularly the case in Figure 3 As can be seen, the foot part recess 34, viewed in the transverse direction Q, has an approximately V-shaped cross-sectional shape, which is delimited by two flanks 35 running inclined in the height direction, which are connected to one another via a connecting section 36 curved with a first radius of curvature R1. The flanks 35 and the connecting section 36 are each formed by a section of the upper foot part edge 33.

The foot part recess 34, viewed in the height direction H, has a depth t which describes the maximum distance between the connecting section 36 and the sections of the upper foot part edge 33 that adjoin the flanks 35.

Between the front foot part edge 30 and the shaft part 12, an edge with a front curved section 40 extends along the foot part base 28 and an edge with a rear curved section 41 extends between the rear foot part edge 31 and the shaft part 12 the foot part base 28 represents a constriction of the foot part 27 with a shorter length than the upper foot part area 29. The curved sections 40, 41 form, so to speak, concave edge areas. The front curved portion 40 has a second radius of curvature R2 and the rear curved portion 41 has a third radius of curvature R3. The second radius of curvature R2 and / or the third radius of curvature R3 can be constant at least in sections, so that the curved sections 40, 41 are each formed by one or more adjoining circular arcs to let. The curved sections 40, 41 can also be formed by continuously changing amounts of the radii of curvature R2, R3, which is shown in FIG Figure 3 is illustrated schematically by the dash-dotted lines.

The two curved sections 40, 41 are preferably arranged mirror-symmetrically to a plane of symmetry which is oriented at right angles to the longitudinal direction L and which runs centrally through the foot part 27. In particular, the entire foot part 27 can be designed symmetrically to this plane of symmetry.

The curved sections 40, 41 merge into the upper side 21 of the shaft part 12. From the upper side 21 of the shaft part 12 to the transition point 32, i.e. to the upper foot part area 29, the foot part base 28 has a base height b. According to the example, the base height b is greater than the maximum shaft height z of the shaft part 12.

The machine knitting needle 11 also has two guide sections, between which the foot section 26 is arranged, namely a front guide section 45 and a rear guide section 46. The two guide sections 45, 46 are designed essentially the same. At least the front guide section 45 directly adjoins the foot part section 26, whereas the rear guide section 46 is arranged at a distance from the foot part section 26 according to the example. Each guide section 45, 46 has a guide arm 47 which projects away from the shaft part 12. In the exemplary embodiment, each guide arm 47 has a connecting leg 48 which runs obliquely to the height direction H and to the longitudinal direction L and a connecting leg 48 which is essentially parallel to the longitudinal direction and consequently extension arm 49 extending parallel to the shaft part 12. The extension arm 49 is arranged at a distance from the shaft part 12 in the height direction. The guide arm 47, together with a section of the shaft part 12, delimits an intermediate space 50 which, according to the example, is open on one side in the longitudinal direction L. The intermediate space 50 is arranged between the extension arm 49 and the region of the shaft part 12 arranged below it and is delimited in the longitudinal direction L on one side by the connecting arm 48. The guide arm 47 and the region of the shaft part 12 adjoining the intermediate space 50 thus form a fork-like part of the machine knitting needle 11.

Compared to the longitudinal direction L, the connecting leg 48 extends inclined at an angle of inclination α. The angle of inclination α is at least 15-20 degrees and at most 90 degrees and in preferred exemplary embodiments can be in the range from 25 degrees to 45 degrees or up to 65 degrees. The connecting leg 48 extends in the height direction H from the shaft part 12 and at the same time in the longitudinal direction L away from the foot part 27. The spaces 50 of the two guide sections 45, 46 are each open away from the foot part 27 in the longitudinal direction L.

In the embodiment illustrated here, the boom legs 49 extend parallel to the longitudinal direction L. Compared to the longitudinal direction L, the boom legs 49 can also run inclined with relatively small angles of inclination in the range of a maximum of 10-15 degrees.

The boom leg 49 extends from the connecting leg 48 to a leg end 49. Im At the rear guide area 46, the leg end 51 of the boom leg 49 and the rear end 14 of the shaft part 12, viewed in the longitudinal direction L, have the same position and are flush. Thus, a plane oriented at right angles to the longitudinal direction L can be created which touches both the rear end 14 and the leg end 51 and is not penetrated by either the rear end 14 or the leg end 51.

Following the leg end 51, the boom leg 49 has a section with a first leg width s1 at right angles to its direction of extension. Since the boom leg 49 is aligned, for example, parallel to the longitudinal direction L, the first leg width s1 of the boom leg 49 is measured in the height direction H. The first leg width s1 is approximately as large as a first shaft height z1 of the shaft part in the guide section 45, 46.

In a transition area to the shaft part 12, the connecting leg 48 has a second leg width s2 which is at least 1.5 times greater than the first shaft height z1 of the shaft part 12 and / or like the first leg width s1. The second leg width s2 is measured in the longitudinal direction L after the shaft part 12.

The maximum distance between the support surface 20 and an upper side or an upper edge of the boom leg 49 defines a guide boom height c. In the height direction H, the space in the region of the leg end 51 has a space height d. The gap height d decreases below the connecting leg 48.

Adjacent to the intermediate space, an inner edge 52 of the connecting leg 48 merges with a curved region which has a fourth radius of curvature R4 into the top side 21 of the shaft part 12.

The front guide section 45 adjoins the foot section 26 directly. An outer edge 53 of the connecting leg 48 opposite the inner edge 52 thereby merges directly into the front curved section 40. In this connection area between the outer edge 53 and the front curved section 40, the shaft part 12 has a second shaft height z2, which can be different from the first shaft height z1. The second shaft height z2 is a maximum of 1.1 mm. In the exemplary embodiment, the second shaft height z2 is greater than the first shaft height z1. Alternatively, the first shaft height z1 and the second shaft height z2 could also be of the same size.

Like it in Figure 1 As can be seen, the guide arm 47 and in particular the arm leg 49 of the front guide section 45 overlaps the front shaft section 19. The front shaft section 19 thus extends into the space 50 of the front guide section 45.

The front guide section 45 and the rear guide section 46 have the same length x4 in the exemplary embodiment. Alternatively, the lengths of the two guide sections 45, 46 could also be of different sizes. The length x4 of the guide sections 45, 46 is on the one hand through the leg end 51 and on the other hand through the transition from Guide arm 47 is defined in the shaft part 12 and, for example, from the transition point of the outer edge 53 into the upper side 21 of the shaft part 12. The length x4 of the guide sections 45, 46 can roughly correspond to the length x3 of the foot section 26.

In the Figures 1 and 4th It can be seen that the rear guide section 46 does not directly adjoin the foot section 26 and that an intermediate section 57 is located between the rear guide section 46 and the foot section 26, in which the shaft part 57 has a substantially rectangular cross section and is free of projections or depressions . In the longitudinal direction L, the intermediate section 57 has a length x5. The length x5 of the intermediate section 57 is, for example, smaller than the length x3 of the foot section 26 and / or smaller than the length x4 of the guide sections 45, 46. In other embodiments, the intermediate section 57 can also be longer than the foot section 26 and / or the guide sections 45 , 46. In the intermediate section 57, the shaft part 12 has a third shaft height z3 which, for example, can be as large as the first shaft height z1 or the second shaft height z2.

The length x2 of the front shaft section is preferably greater than the length x4 of the guide sections 45, 46 and / or greater than the length x3 of the foot section 26 and / or greater than the length x5 of the intermediate section 57. While knitting often only part of the Length x2 used for the stitch take-up, for example about half. However, the free length of the shaft part 12 in the front shaft section 19 dampens shocks and vibrations, which in particular via the foot part 27 into the Machine knitting needle 11 are initiated.

Using the guide arms 47 in the guide sections 45, 46, the machine knitting needle 11 can pass through the lock and / or the opposite channel walls of the guide or needle channel in the transverse direction Q at points spaced apart from one another in the longitudinal direction L both in the height direction H and in the transverse direction Q a knitting machine are supported. For example, in a circular knitting machine, centrifugal forces occur due to the rotation of the knitting cylinder relative to the lock, as well as forces acting laterally on the foot part 27. In addition, the machine knitting needle 11 is accelerated in the longitudinal direction L through the lock path of the lock by means of the foot part 27. Due to the constriction in the foot part base 28, the forces acting in the longitudinal direction on the foot part 27, which are introduced in particular via the two foot part edges 30, 31, can be dampened, so that the stress on the machine knitting needle 11 is reduced and deviations in the positioning accuracy during loop formation are reduced become. The guidance and positioning of the machine knitting needle 11 is further supported by the guide arms 47, the arm legs 49 of which extend in the height direction H at a distance from the shaft part 12, forming an intermediate space 50. The boom legs 49 can move elastically relative to the region of the shaft part 12 lying therebelow. Forces acting in the height direction H on the boom legs 49 through the lock are therefore at least partially absorbed by the elasticity of the boom legs 49. In this way, the machine knitting needle 11 in a guide or needle channel of a knitting cylinder with the support surface 20 rests very well on the base of the needle channel or the guide channel. This improvement in the positioning accuracy is also improved in particular by the fact that the bearing surface 20 is free of depressions and recesses in which dirt can collect during knitting. This is particularly advantageous when knitting with staple yarns.

The invention relates to a machine knitting needle 11 with a shaft part extending in a longitudinal direction L and having a support surface 20 on an underside. Outside of a front end section 18 set up for loop formation, the support surface 20 extends continuously in a plane E up to the transition into the rear end 14 of the shaft part 12 opposite the front end section 18. Between a front guide section 45 and a rear guide section 46 there is a foot section 26 a foot part 27 is present. In each guide section there is a guide arm 47 which projects away from the shaft part 12 in a height direction H and delimits an intermediate space 50 between a arm leg 49 of the guide arm 47 and the area of the shaft part 12 arranged below it.

List of reference symbols:

10

Machine knitting tool

11

Machine knitting needle

12th

Shaft part

13th

front end

14th

rear end

15th

Needle hook

16

Closing element

17th

tongue

18th

front end section

19th

front shaft section

20th

Support surface

21st

Top

22nd

Side face

26th

Foot section

27

Foot part

28

Foot part base

29

upper foot section

30th

front foot part edge

31

rear edge of the foot part

32

Transition point

33

upper edge of the foot part

34

Foot section recess

35

Flank

36

Connection section

40

front curved section

41

rear curved section

45

front guide section

46

rear guide section

47

Guide boom

48

Connecting leg

49

Outrigger legs

50

Space

51

Leg end

52

Inner edge of the connecting leg

53

Outer edge of the connecting leg

57

Intermediate section

α

Inclination angle

A.

Swivel axis

b

Base height

c

Guide boom height

d

Clearance height

H

Height direction

L.

Longitudinal direction

Q

Transverse direction

R1

first radius of curvature

R2

second radius of curvature

R3

third radius of curvature

R4

fourth radius of curvature

s1

first leg width

s2

second leg width

t

Depth of the foot section recess

xg

overall length

x1

Length of the front end section

x2

Length of the front shaft section

x3

Length of the foot section

x4

Length of the guide section

x5

Length of the intermediate section

z

Shaft height

z1

first shaft height

z2

second shaft height

z3

third shaft height

Claims (15)

1. Machine knitting needle (11) formed as a latch needle,
   with a shaft part (12) extending in a longitudinal direction (L) and having on an underside a support face (20), wherein the shaft part (12) in a front end portion (18) is configured to form a stitch, and wherein the support face (20) extends continuously in one plane (E) at least between the front end portion (18) and a rear end (14),
   with a front guide portion (45) in which a guide arm (47) protrudes from the shaft part (12) in a height direction (H), and with a rear guide portion in which a further guide arm (47) protrudes from the shaft part (12) in the height direction (H),
   and with a foot part portion (26) which is arranged between the two guide portions (45, 46) and in which a foot part (27) is present which protrudes from the shaft part (12) in the height direction (H) and is configured to cooperate with a drive device of a knitting machine,
   characterised in that
   each guide arm (47) has an arm limb (49) which, together with the region of the shaft part (12) arranged below this in the height direction (H), delimits an intermediate space (50) that is open in the longitudinal direction (L),
   wherein a front shaft portion (19) of the shaft part (12) is provided directly adjacent to the front end portion (18), wherein the shaft part (12) is configured to receive one or more stitches through which the shaft part (12) extends during knitting,
   wherein the front guide arm (47) at least partially protrudes over the front shaft portion (19) so that the front shaft portion (19) extends into the intermediate space (50) of the front guide portion (45).
2. Machine knitting needle according to claim 1, characterised in that each guide arm (47) has a connecting limb (48) which connects the arm limb (49) to the shaft part (12).
3. Machine knitting needle according to claim 2, characterised in that the connecting limb (48) encloses with the longitudinal direction (L) a slope angle (α) which has an amount in the range from 20° to 90° or 25° to 65°.
4. Machine knitting needle according to any of the preceding claims, characterised in that in a transitional region to the shaft part (12), each guide arm (47) has a width (s2) in the longitudinal direction (L) which is at least 1.5 times as great as the maximum shaft height (z) of the shaft part (12).
5. Machine knitting needle according to any of the preceding claims, characterised in that at right angles to its extent direction, the arm limb (49) has a width (s1) which is as great as a shaft height (z1) of the shaft part (12) arranged below this.
6. Machine knitting needle according to any of the preceding claims, characterised in that in the rear guide portion (46), the arm limb (49) of the guide arm (47) has a free limb end (51) which in the longitudinal direction (L) has the same position as a rear end (14) of the shaft part (12).
7. Machine knitting needle according to any of the preceding claims, characterised in that in a transitional region to the shaft part (12), the foot part (27) has a foot part base (28) whose length in the longitudinal direction (L) is smaller than the length of an upper foot part region (29) adjacent thereto in the height direction (H).
8. Machine knitting needle according to claim 7, characterised in that a base height (b) of the foot part base (28) is greater than a shaft height (z1) in the guide portions (45, 46), and/or the base height (b) of the foot part base (28) is smaller than the guide arm height (c) of the guide arm (47) starting from the support face (20) of the shaft part (12).
9. Machine knitting needle according to claim 7 or 8, characterised in that the foot part base (28) has a curved portion (40, 41) on each of its two opposite sides in the longitudinal direction (L).
10. Machine knitting needle according to claim 9, characterised in that the curved portion (40, 41) has a constant radius of curvature (R2, R3).
11. Machine knitting needle according to claim 9, characterised in that the curved portion (40, 41) has a changing radius of curvature (R2, R3) which is at its greatest adjoining the shaft part (12).
12. Machine knitting needle according to any of the preceding claims, characterised in that the foot part (27) has at least one foot part recess (34) which is arranged spaced from the shaft part (12) in the height direction (H).
13. Machine knitting needle according to claim 12, characterised in that the at least one foot part recess (34) is open on the side opposite the shaft part (12) in the height direction.
14. Machine knitting needle according to any of the preceding claims, characterised in that in the foot part portion (26), the shaft part (12) has a shaft part height (z2) of maximum 1.1 mm.
15. Machine knitting needle according to any of the preceding claims, characterised in that in the longitudinal direction (L), the shaft part (12) has a total length (xg) of maximum 100 mm.

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