CN113574218A

CN113574218A - Knitting machine needle and knitting system

Info

Publication number: CN113574218A
Application number: CN202080011906.7A
Authority: CN
Inventors: J·绍特; U·施廷格尔
Original assignee: Groz Beckert KG
Current assignee: Groz Beckert KG
Priority date: 2019-01-31
Filing date: 2020-01-21
Publication date: 2021-10-29
Anticipated expiration: 2040-01-21
Also published as: EP3690095B1; WO2020156875A1; CN113574218B; BR112021005119B1; TW202045789A; PT3690095T; BR112021005119A2; KR20210122223A; AR117875A1; EP3690095A1; JP2022519143A

Abstract

The invention relates to a needle (1) for a knitting machine, comprising at least the following features: a hook (2) for forming a loop, which constrains the rod (3) in the longitudinal direction (z) of the rod (3) and which terminates in a hook tip (4), and a first drive section (33) following the hook (2) in the longitudinal direction (z) of the rod (3). The knitting machine needle (1) is characterized by a predetermined breaking section (9) for separating the hook (2) from the first drive section (33). The predetermined breaking section (9) is formed by a section of the rod (3) extending in the longitudinal direction (z). The predetermined breaking section (9) is located completely in a first lever section (10) which extends in the longitudinal direction (z) of the lever (3) between the tip (4) of the needle hook (2) and the first drive section (33). Furthermore, a knitting system (15) is claimed, which has at least one knitting machine needle (1) with a predetermined breaking zone (9).

Description

Knitting machine needle and knitting system

Technical Field

The invention relates to a needle for a knitting machine (Strickmaschennadel) and a knitting system. Knitting machine needles are known in many different embodiments. A knitting machine needle is inserted into the knitting machine and is often moved in a channel of a needle bed of the knitting machine via one or more feet of the knitting machine needle. For this purpose, the foot of the needle of the knitting machine cooperates with a cam at the knitting machine. In particular in the case of fast-running knitting machines, the knitting machine needles are subjected to a strong acceleration. Knitting machine needles with latch (Zunge) are frequently used ("latch needles"). The latch performs a large number of rapid oscillating movements which are used to form a loop with the hook. Due to the high dynamics of this oscillating movement, defects can occur in the formation of the loops in the case of fast-running knitting machines. Such defects are promoted by the inevitable wear at the hook and latch. The hook and the latch are arranged at the front end of the knitting machine needle and are connected with the foot of the knitting machine needle via a rod.

Background

In some knitting machine types, a collision occurs between the foot of the knitting needle and the cam (Schloss) or the selection element (Auswahlteile). In order to inhibit lesion formation or at least to attenuate it, JP62191888U and EP1424416a1 propose the following: the foot of the knitting machine needle is loaded with a predetermined breaking point (sollbruchselle) so that the foot breaks before a larger lesion is formed. CN2534208Y also indicates similar predetermined breaking points. Additionally, the needle shown in CN2534208Y indicates a notch (Kehle) in the underside of the shank of the needle below the position of the back-up of the latch (zungenricklage). Such a recess serves to relieve the tension of the thread loop in the event that the thread loop slides over the latch which is in the standby position. This tension unloading takes place when an already existing knitted fabric, preferably the previous stitch, engages into the recess. Such a recess for the tension relief can be found in many embodiments of the knitting machine needle below or in the immediate vicinity of the latch back position. These notches are not intended to be a predetermined breaking point, since the notches are just not intended to break with a noticeable probability by the force exerted by the yarn on the hook.

DE1635837a1 indicates a needle which is equipped at the shank with a section which is intended to prevent shock waves from being transmitted from the foot to the hook. These sections can be configured as sections with altered mechanical properties or as sections with a reduction in the needle cross section. These special sections are implemented in each embodiment at the location of the bar where the bar has its maximum height. It is therefore just not a predetermined breaking point, since the rod does not break with great probability at these positions.

DE4320956a1 and DE19503048C2 indicate predetermined breaking points at the sewing needle or knitting needle.

Recently, particularly in the case of elongated knitting needles, damage occurs due to the collision of the foot of the adjacent region of the bar with the triangle.

Disclosure of Invention

The object of the present invention is to remedy this problem.

This object is achieved by a knitting machine needle according to claim 1 and a knitting system according to claim 13.

The needle of the knitting machine according to the invention comprises a hook for forming a stitch, which limits or starts at the shank in its longitudinal direction and which terminates in a hook tip. In the longitudinal direction of the lever, the first drive section follows the needle hook. The forces are transmitted from the cams of the knitting machine to the drive sections of the knitting machine needles for moving the knitting machine needles. The drive section may be configured as a foot which projects beyond the rod in the direction of the positive height of the rod. The drive section may be formed by a junction site (Kupplungsstelle). In this case, the coupling element generally has a foot and the force for moving the knitting machine needle acts in a known manner on the coupling point of the knitting machine needle. Furthermore, the knitting machine needle according to the invention may comprise a latch. The latch can be rotatably hinged at the lever in such a way that it closes the interior of the hook in its closed position and the tip of the latch points in its rear position in the longitudinal direction of the lever toward the first drive section. The latch can be rotatably supported at the lever on a pin, a hinge or a shaft formed at the lever.

The needle of the knitting machine according to the invention is characterized by a predetermined breaking section for separating the hook from the first drive section, which is formed by a section of the shank extending in its longitudinal direction. The "section" has in the language of the present document more than an infinitesimal stretch in the longitudinal direction of the needle. The predetermined breaking point is located completely in a first lever section which extends in the longitudinal direction of the lever between the tip of the needle hook and the first drive section.

It has surprisingly been found that the problem of damage at the needle bed and at the cams is largely suppressed by the preset breaking section which exerts its effect on the shank of the knitting machine needle and causes its breaking between the hook and the first drive section.

The predetermined breaking zone has a non-infinitesimal extension in the longitudinal direction of the knitting machine needle. When the movement of the needles in the needle bed is blocked or the knocking over of the stitches fails, the knitting machine needles break at the predetermined breaking section with a high probability due to the forces transmittable through the yarn. In the sense of the present document, the shank of the knitting machine needle extends over its entire longitudinal extension. The rod can only be divided into different functional sections. The end section of the rod forms a hook and has a section adjacent to the hook that can come into contact with the yarn during knitting. Furthermore, the bar comprises a section (driving section or foot) via which the movement of the knitting machine needles is introduced. The zones located between the above-mentioned zones are used, for example, for guiding the knitting machine needles (in the needle bed) and connecting the above-mentioned functional zones. The predetermined breaking section is advantageously located in a section of the rod that serves the function of guiding and connecting other functional sections. The rod may have sections with different heights. The sections of the rod of different heights may transition into each other at a transition point. The first transition point may be arranged near the drive section. The second transition point may be arranged in the vicinity of the hook. The second transition point can be spaced in the longitudinal direction from the hook tip, for example, twice or three times as far as the latch tip in the standby position of the latch. The distance between the second transition point and the hook tip can also take any value between the values mentioned above.

The knitting machine needle may have a predetermined breaking point which is set such that the hook can be separated from the first drive section by a force which acts at the hook and which is less than 80% of the force in which a needle of the same construction is permanently deformed without the predetermined breaking section. The predetermined breaking point can be set in particular such that the hook can be separated from the first drive section when a corresponding force acts on the hook in the negative height direction. It is clear to the expert that at least the diameter ("fineness") of the yarn is in a certain ratio to the breaking strength of the needle and this breaking strength is of course also determined by the needle fineness. The fineness also determines the maximum diameter of the yarn to be applied. The tensile strength of the yarn is of course also decisively dependent on the yarn diameter, so that the fineness is generally the needle characteristic which has a greater influence on the design of the predetermined breaking section. The fineness of the knitting machine needle (or "gauge") may be determined by the thickness of the tape from which the knitting machine needle is punched and may be measured in the width direction of the knitting machine needle. In needles with a gauge of 0.4mm, the force in which the hook is separated from the first drive section can be about 5N to 1N depending on the embodiment of the predetermined breaking section, while knitting machine needles of the same construction will be permanently deformed in the case of about 8N. "deformation" here especially represents the generic concept of "bending". A special test for verifying the suitability of the predetermined breaking section can consist in placing the needle with its underside (the side facing away from the foot in its height direction) on a table, sliding the needle with the hook forward on the table up to the table edge until the (front) part of the hook side of the needle projects beyond the table edge, at least until the predetermined breaking section. If the hook is then loaded with a defined breaking or breaking force, a break should occur at the predetermined break section. The suitability of the needle is suspected for the purpose of this document if, in the case of a further increase in force (see example above), plastic deformation occurs without fracture.

The knitting machine needle can have a predetermined breaking section completely in the second lever section, wherein the second lever section extends in the longitudinal direction of the lever between the position of the latch tip in the standby position of the latch and the first drive section.

The knitting machine needle can have a predetermined breaking point completely in a third lever section which begins in the longitudinal direction of the knitting machine needle at a point which is spaced apart from the hinge point of the latch by two latch lengths in the direction toward the first drive section and which ends in the longitudinal direction of the knitting machine needle at a point which is spaced apart from the hinge point of the latch by three latch lengths in the direction toward the first drive section, wherein the latch length is the distance between the hinge point of the latch and the latch tip. This hinge or bearing point of the latch can have a bearing in the form of a circular split in the latch, into which a shaft or a pin engages. The latch length can be measured from the centre of the split. The latch tip is the point of the latch that is furthest from the center and the separation of these two aforementioned points may be the latch length. By specifically determining the position of the predetermined breaking zone in the longitudinal direction of the knitting machine needles, the variance between the individual samples of a large number of knitting machine needles with respect to the force values in which the separation of the hook from the drive zone is achieved can be reduced. The above-described starting and ending positions of the third rod section are particularly advantageous when the hinge length is 6.5 mm. The length of the hinge is measured in the longitudinal direction of the lever from the hook-side end of the needle in the longitudinal direction of the lever to the latch tip in the standby position of the latch. In the case of a knitting machine needle with a hinge length of 7.5mm, the third lever section can start at a point spaced 1.5 latch lengths from the hinge point of the latch and end at a point spaced 3 latch lengths from the hinge point of the latch length. In the case of a knitting machine needle with a hinge length of 5.5mm, the third lever section can start at a point spaced from the hinge point of the latch by a length of 2 latches and end at a point spaced from the hinge point of the latch by a length of 3.5 latches. In the case of a knitting machine needle with a hinge length of 4.5mm, the third lever section can start at a point spaced from the hinge point of the latch by a length of 2.5 latches and end at a point spaced from the hinge point of the latch by a length of 4 latches. The position of the third lever section can be deduced accordingly for values of the hinge length not mentioned.

The predetermined breaking section may be in the fourth or fifth rod section. The fourth bar section may extend from the hinge point of the latch up to the second transition point. The fifth rod section may extend from the position of the latch tip in the armed position up to the second transition point. In the case of a knitting machine needle without latch (for example a compound needle), the preset breaking section can be in the sixth bar section described below: the compound needle has a guide means (hook closing element) for the slider at a distance from the hook tip in the longitudinal direction, which extends in the longitudinal direction toward the drive section. These guide means do not extend until below the hook tip. This results in a minimum distance between the hook tip and the guide means in the longitudinal direction. The sixth rod section may extend from the hook tip from 1.5 times the minimum pitch to three times the minimum pitch.

The needles of the knitting machine can have a spacing of at least 75mm from the end of the needle on the hook side in the longitudinal direction of the shank up to the beginning of the first drive section or the first foot on the hook side in the longitudinal direction.

The knitting machine needle may have a shank which, in the region in which the latch is hinged at the shank, has a height ("chest height") of 0.8 to 1.5mm at the highest point in this region. The height is measured in the height direction. The knitting machine needle may have a shank having a height of between 50% and 70% of the chest height in the section in which the predetermined breaking section is arranged.

The knitting machine needles may have the following stems: the bars are punched out of the strip material and have a thickness, measured in the width direction, of 0.3 to 0.6mm or up to 0.7mm in the region in which the thickness of the bars still corresponds to the thickness of the strip material.

The knitting machine needle may comprise a predetermined breaking section with a reduction of the shaft cross section perpendicular to the longitudinal direction. The "perpendicular to the longitudinal direction" extends in particular with a plane which is spanned by the height direction x and the width direction y of the needles.

The knitting machine needles can have a predetermined breaking section with a reduction in the shaft cross section, which is achieved by a reduction in the height direction of the shaft. The predetermined breaking section thus designed may have the advantage that it can be installed together at the time of the stamping process and thus does not require a separate manufacturing process. The predetermined breaking section can thus be produced at low cost. The height of the bars can be reduced in the height direction from above and/or from below. However, it is also conceivable to install a recess (or recesses) in the rod which does not pass through the top and bottom surfaces of the working (durchgreifen) rod or the predetermined breaking section. The needles of the knitting machine can have a predetermined breaking section with a minimum 10% and a maximum 60% reduction in the height or height dimension of the adjacent bar or of the adjacent bar section at the location with the largest reduced cross section. Thus, 40% to 90% of the cross-sectional area (in a plane transverse to the longitudinal direction of the needle) remains at the thinnest point of the predetermined breaking section. The relevant cross-sectional reduction or height reduction can also be distributed over different subsections (20% from above, 25% from below) of the predetermined breaking section, in particular when there are a plurality of grooves engaging into the bar from different directions (for example from above and from below). A groove-like design of the region of reduced cross section of the predetermined breaking section makes it possible to obtain a relatively precisely defined position in the longitudinal direction for the needle hook to be separated from the drive section. Stress concentration occurs at the location of the predetermined breaking section. In addition or alternatively, the width of the needle can naturally also be reduced. Measures comparable to those described above for the height reduction of the rod dimensions can be taken here.

The knitting machine needles may have a reduction of the shank in the height direction, which has a triangular shape with an opening angle of 60 ° to 120 °. An opening angle of 90 ° may be particularly advantageous. Here, three corners formed in the rod may be rounded. In the case of a small reduction in the height direction, a radius of the rounding of at least 0.02mm is advantageous, and in the case of a large reduction in the height direction, the rounding can also advantageously be implemented with a radius of 0.35mm or, for example, also 0.4mm or 0.5 mm. The height reduction can also be implemented trapezoidally, in the form of steps or in another geometric shape. From the point of view of the previous embodiment, what becomes evident here with respect to the groove unloading the loop, for example in the case of sliding via the latch in its rear standby position, is the following difference: such grooves have a larger opening angle and a flat course in order to allow easy entry and exit of the coil. In contrast, most predetermined breaking sections should cause a defined break at a defined point, so that the opening angle of the flank (Seitenflanke) is smaller in such predetermined breaking sections. Also due to the particular shape that is advantageous for the predetermined breaking section, it is advisable to position such predetermined breaking section at a location that is just not considered for the coil unloading groove: the coil relief groove is at a location over which the coil slides away. The pre-designed break section, due to its shape, may "catch" the stitch and thus threaten the knitting process. It is therefore advantageous, as mentioned, to position the predetermined breaking point behind the position of the tip of the latch in the event of a backup of the latch. A further consideration that supports the positioning of the pre-set breaking section in the rear region of the needle is leverage: when the loop, and in particular the loop which is not looped here, transmits a high force to the inner region of the hook, the spacing from the hook increases the leverage of this force on the predetermined breaking section.

The knitting machine needles may have preset breaking zones, the material of which has a lower elongation at break (BruchDehnung) than the zones of the remaining stems. The behaviour of the knitting machine needles in case of overload can be specifically controlled by this embodiment of the preset breaking zone (in addition or alternatively to the height reduction or similar measures). The different deformations in the plastic range of the material are advantageously suppressed for targeted breaking in the case of loads which significantly exceed the design of the knitting machine for this purpose. The knitting machine needles are advantageously made of steel. The influence of the elongation at break can be performed in the case of steel by targeted adjustment of the hardness or the structure. The structure in the predetermined breaking section can therefore be implemented in a targeted manner, brittle and/or coarse-grained manner.

As already mentioned at the outset, the problem with damage at the needle bed and the cams occurs primarily in knitting systems in which elongated knitting machine needles are used in the case of high knitting speeds. In the current literature, the concept of "needle bed" is applied as a generic concept for the components of a knitting system that guide needles during a knitting run. This is in particular the knitting cylinder and the dial (Rippscheibe) of circular knitting machines and the flat bed in flat knitting machines.

DE331136a1 and DE102014118217a1 describe measures for further increasing the power capacity of fast-running knitting machines and show in the figures an example of a typical knitting system with corresponding knitting machine needles. The invention is particularly directed to improvements in knitting machine needles and knitting systems that are suitable for the high power requirements indicated in these documents. Both documents describe knitting systems with needles having a very long thin shank section between the hook and the first foot. The majority of these long and thin rod sections are guided laterally (in the direction of the width of the needles) in the relevant needle bed not by the webs of the needle bed but by the sinkers (platines) according to the two above-mentioned documents. Knitting systems of the aforementioned type achieve greater knitting power in the case of higher fineness. The contents of these two aforementioned documents are hereby incorporated into the application at least with regard to the shape of the needles used and with regard to the arrangement of the needles and the sinkers into the relevant knitting system.

The knitting system according to the invention comprises a needle bed with guide means and at least one passage base which are set to accommodate and guide and support the knitting machine needles in their longitudinal direction in the event of intermittent movement thereof. Needle beds in the form of needle cylinders, needle disks or flat needle beds, for example, for flat knitting machines, can be considered here. The knitting machine needles are accommodated in the channels by the needle bed and are guided in the width direction of the knitting machine needles by the channel webs and are supported by the channel bases in the negative height direction of the knitting machine needles. In particular, the guiding of the knitting machine needles in the width direction does not necessarily have to take place over the entire longitudinal extension of the knitting machine needles, but can also take place only in the rear section of the knitting machine needles. The knitting machine needles can also be guided in the width direction in other sections of their longitudinal extension, for example, by other knitting tools (this is the case, for example, in knitting systems according to documents DE3311361a1 and DE102014118217a 1). A similar applies to the support of the knitting machine needles on the channel bases.

Furthermore, the knitting system according to the invention comprises at least one triangle (Schlossteil) for transmitting forces to at least one first drive section of a knitting machine needle accommodated in the needle bed. Frequently, the feet of the needles of the knitting machine project from the channels of the needle bed and are accommodated in orbital recesses ("trigones") in the triangle. Generally, circular knitting machines have a plurality of triangles, which accordingly define part of the path of the loops through (the connecting element) in the case of a complete rotation of the needle cylinder of the circular knitting machine. By this relative movement of the knitting machine needle with respect to the cam in the width direction of the needle, the cam transmits a force to the associated drive section or stitch which moves the needle in the longitudinal direction of the needle in the circular knitting machine during the knitting operation.

Knitting systems with a large number of knitting machine needles, each of which contains the following features in its respect, are also the subject of the current literature:

a hook for forming a loop, which constrains the rod in its longitudinal direction and which terminates in a hook tip,

the first drive section following the needle hook in the longitudinal direction of the bar.

The knitting system according to the invention is characterized in that at least one of the knitting machine needles has a predetermined breaking section for separating the hook from the first drive section. The predetermined breaking section is formed by a first section of the rod extending in its longitudinal direction. The predetermined breaking section is located completely in the first lever section, which extends in the longitudinal direction of the lever between the tip of the needle hook and the first drive section.

Due to the predetermined breaking zone, an extraordinarily large force acting on the hook in the negative height direction of the knitting machine needles causes a separation of the hook from the first drive zone. This force is thus not transmitted to the section of the lever which lies immediately adjacent to the triangle. Damage to the needle bed and to the triangle triggered by the collision is eliminated or at least reduced by this measure.

The knitting system according to the invention can be designed in such a way that the positions of the guide means and the at least one passage base, the at least one cam and the drive section and the predetermined breaking section of the needle bed at the at least one knitting machine needle are coordinated in such a way that the at least one knitting machine needle is at least at times moved out of the guide means so far during the knitting operation that the guide means at least partially no longer support the predetermined breaking section of the at least one knitting machine needle. The predetermined breaking section is located above the first triangular section at least in the removed state of the knitting machine needle. By means of this special coordination, the behavior of the system can be precisely controlled when exceptionally high forces act at the hook or at the section of the knitting machine needle which is no longer supported. High forces can then act on the relatively long lever from the hook up to the predetermined breaking section if necessary. Since the predetermined breaking section is approximately at the point at which the removed knitting machine needle starts by the support of the needle bed, the highest probability of a highly defined break at or in the predetermined breaking section results. It is therefore important here that the predetermined breaking section is arranged at the front not too far in the direction of the hook, since otherwise undefined breaks may occur due to the lever action at the location where the knitting machine needles are again supported by the needle bed. If the predetermined breaking zone is located entirely in the supported region, undefined breaks may occur at the edge of the needle bed. High forces can occur, for example, as a result of the fabric winding (Warenabzug) when the loops are not unseated and collect in the hooks. The winding force can then be applied quickly to the hook, for example by a factor of 2 or more above the conventionally occurring winding force.

The use of needles according to the current document is particularly advantageous in knitting systems such as those described in DE3311361a1 and DE102014118217a 1. The knitting system which is the subject of the present document also advantageously has the additional properties of DE3311361a1 and DE102014118217a 1.

Drawings

Figure 1 shows a knitting machine needle in a general view,

figure 2 shows an enlarged section of the knitting machine needle of figure 1,

figure 3 shows an enlarged section of an alternative embodiment of a knitting machine needle similar to that in figure 2,

figure 4 shows an alternative embodiment of a needle of a knitting machine in a general view,

figure 5 shows an enlarged section of the knitting machine needle of figure 4,

figure 6 shows an enlarged section of an alternative embodiment of a knitting machine needle similar to that in figure 5,

fig. 7 shows an enlarged section of the knitting machine needle according to fig. 2, with the closed position of the latch and two cross-sectional views additionally illustrated,

fig. 8 shows, in a symbolically illustrated form, a knitting system according to the invention.

Detailed Description

Fig. 1 shows a knitting machine needle 1 in a general view. The illustration is not to scale and details not essential to the invention have been omitted. The further figures are also simplified correspondingly. For illustration, a coordinate system is shown, which shows the defined direction at the knitting machine needle 1. Here, the longitudinal direction of the knitting machine needle 1 is designated by z, the width direction by y, and the height direction by x. The hook 2 can be found in the longitudinal direction z of the knitting machine needle 1 at the left-hand end in fig. 1. Shortly in the longitudinal direction z, at the right-hand end of the knitting machine needle 1 in fig. 1, the knitting machine needle 1 has a foot 5 (also referred to as drive section 33). The foot 5 projects beyond the knitting machine needle 1 in the positive height direction x. In all the figures, only one foot 5 is shown at the knitting machine needle 1. In the case of all embodiments, however, it is conceivable for the knitting machine needle 1 to extend still further to the right and to have one or more further feet. Between the hook 2 and the foot 5 extends a shank 3 of the knitting machine needle 1. The bar 3 has a long and thin profile that is clearly recognizable. The length from the hook-side open end 20 of the knitting machine needle 1 up to the hook-side open end 19 of the first foot 5 is 78mm in the present exemplary embodiment. For illustration, three sections (10,11,13) of the longitudinal extension of the shank 3 of the knitting machine needle 1 are shown in braces. The first section 10 and the second section 11 extend at their right-hand end as far as the beginning of the first foot 5 on the hook side. At the rod 3, a predetermined breaking section 9 is mounted in a third section 13 surrounded by the first section 10 and the second section 11 together. This predetermined breaking zone and further details can be better recognized in the enlarged illustration of the left-hand region of the knitting machine needle 1 in fig. 2.

The hook tip (4) and the hook-side end 20 of the knitting machine needle 1 can be recognized in particular in the enlarged view of fig. 2. During the knitting process, a yarn loop (garnschelafen) for stitch formation is held in the interior of the hook 2 below the hook tip 4. The latch 6, which is shown in its rear position 8, also participates in the formation of a loop. In this position, the latch tip 12 reaches a point at which the latch tip points in the longitudinal direction z maximally towards the foot 5 (also referred to as the drive section 33). The latch 6 is rotatably fixed at a hinge 14 at the lever 3. The bar 3 has a predetermined breaking section 9 with a groove or recess in which the height of the bar or bar dimension is reduced from above in the height direction x. The relevant recess has a triangular shape with a rounded tip. In the rounded tip, the triangle has an angle of 90 ° ("opening angle"). The height of the bar 3 is reduced by about 50% at the location of the smallest residual cross section.

Fig. 3 corresponds approximately to fig. 2, and shows only one alternative embodiment of the predetermined breaking section 9. The size of the cross-sectional reduction is smaller than in the embodiment of fig. 2. The rounding of the tips of the formed recesses of the predetermined breaking portion is not present or is so small that it cannot be recognized in this illustration. In each embodiment, the tip of the formed recess may be rounded. The edges formed on the left and right at the predetermined breaking section 9 at the upper edge of the rod 3 can also be rounded in all embodiments.

Fig. 4 shows a further embodiment of the knitting machine needle 1 in a general view. The knitting machine needle 1 corresponds to a large extent to the knitting machine needle 1 of fig. 1, only one alternative embodiment of the predetermined breaking point 9 being shown. Additionally, the first transition point 28 and the second transition point as well as the fourth section 30 of the rod 3 and the fifth section 31 of the rod 3 are illustrated in braces. The bar 3 has a maximum height (dimension in the height direction x) starting from the foot 5 up to the first transition point 28. After the first transition point 28 in the direction towards the needle hook 2, the height of the shank 3 decreases rapidly to a medium height. After the second transition point 29 in the direction towards the hook 2, the height of the shank 3 decreases again. The fourth section 30 of the shank 3 extends in the longitudinal direction z of the knitting machine needle 1 from the articulation 14 of the latch 6 up to the second transition point 29. A fifth section 31 of the shank 3 extends in the longitudinal direction z of the knitting machine needle 1 from the tip 12 of the latch 6 in the rear position 8 up to the second transition point 29. In both regions, a minimum height of the rod 3 and thus a suitable position for the preset breaking section 9 can be determined. The rod section between the second transition point 29 and the first drive section 33 has a greater height of the rod and therefore does not provide an optimal position for the predetermined breaking section 9.

The predetermined breaking section 9 can be better recognized in the enlarged illustration in fig. 5. The knitting machine needle 1 of fig. 5 differs from the knitting machine needle 1 of fig. 2 and 3 substantially only by the embodiment of the predetermined breaking zone 9. The predetermined breaking point 9 is formed by a reduction in the height of the bar 3 from below in the height direction x. Furthermore, this reduction "from below" is configured identically to the reduction "from above" shown in fig. 2. In general, for all embodiments of the knitting machine needle 1, the reduction of the shank cross section can be advantageously carried out from above, from the lower right or from both sides. Alternatively or in combination, a reduction in the width direction y may also be applied. Additionally, the flanks 25, the height-reduced profile 26 of the dimension of the bar height in the z-x plane and the opening angle 27 of the height reduction are also illustrated in fig. 5.

Fig. 6 shows an enlarged illustration of the front region of the knitting machine needle 1, which corresponds approximately to the knitting machine needle 1 shown in fig. 1 to 5, except for the embodiment of the predetermined breaking point 9. In this embodiment, the predetermined breaking section 9 is formed by a section of the rod 3 whose cross section does not adapt to the configuration of the predetermined breaking section 9. Instead, the hatching of the shaft 3 in the predetermined breaking section 9 indicates that the material of the predetermined breaking section 9 has adapted properties and in particular a lower elongation at break than the

adjacent regions

23,24 of the shaft 3. Such a matching of the material properties in the predetermined breaking section 9 can be advantageously applied for all embodiments of the invention alternatively or in combination with other measures (for example a cross-sectional reduction).

Fig. 7 corresponds approximately to fig. 2. At the knitting machine needle 1 of fig. 7, the latch 6 is shown in its two extreme positions for illustration. The latch is shown not only in its closed position 7 but also in its standby position 8. Furthermore,

adjacent regions

23,24 of the predetermined breaking section are illustrated.

Furthermore, cross-sections A-A and B-B are drawn in FIG. 7 at two locations on the rod 3. The relevant section is arranged on the right side of the knitting machine needle 1 in fig. 7 and shows on the one hand the non-reduced shank cross section 22 and on the other hand the reduction of the shank cross section 21. These cross sections show the first foot 5 and the first transition point 28 and the second transition point 29 in the background.

Figure 8 shows a section through a passage of the needle bed 16 of the knitting system 15 according to the invention. Here, the section line is directly in front of (and parallel to) the side wall of the needle 1 in the width direction y. Knitting system 15 is similar to the knitting systems shown in documents DE3311361a1 and DE102014118217a1, wherein the illustration is not to scale and parts which are important for the knitting process, such as further knitting tools (here in particular sinkers), are removed. As already mentioned above, the sinkers, not shown, guide the knitting machine needles 1 in their width direction y in the region in front of the channel walls 17 in the longitudinal direction z of the needles 1. The sinker adjacent to the needle 1 is thus normally partially visible behind the needle 1. The knitting machine needle 1 is guided in two dimensions of the guide means 17 of the needle bed 16. In the height direction x, the knitting machine needle 1 is supported by the passage base 32 of the needle bed 16. In the width direction y, the knitting machine needle 1 is guided by two channel walls 17. In the illustration of fig. 8, only one channel wall 17 of the needle bed 16 is shown, which guides the knitting machine needle 1 in the width direction y in the rear region of this channel wall, in which the foot 5 is also located (the sinker bearing this is removed as mentioned in the front region). The foot 5 of the knitting machine needle 1 engages into a triangle 18 shown in cross section. In the front region of the needles 1 (in particular from the hook 2 up to the predetermined breaking point 9), the knitting machine needles 1 are not supported in the height direction x by the needle bed 16 in the position shown. The situation shown occurs in the knitting system 15 according to the invention at least when the knitting machine needles 1 are moved out to the maximum extent during the knitting operation. In the withdrawn position of the needles 1, in which the needle bed 16 or other knitting element no longer ensures the supporting function for at least a large part of the preset breaking section 9 or the part of the needles that is in front of the hook side of the preset breaking section, preset breaks are particularly possible. This applies in comparison to the situation in which a predetermined breaking by the force F in the shown loaded position is very likely due to the "breaking" of the front part of the needle 1 by means of the needle hook 2. This breaking is facilitated (leveraged) by the length of the lever (here the distance of the hook 2 from the predetermined breaking section 9).

List of reference numerals:

1 knitting machine needle

2-needle hook

3 rod

4-needle hook tip

5 feet part

6-needle latch

7 closed position

8 back-up position of latch 6

9 predetermined breaking section of latch 6

10 first section of rod 3

11 second section of the rod 3

12 needle tongue tip

13 third section of the rod 3

14 hinged part of latch 6

15 knitting system

16 needle bed

17 guide device

18 triangle

19 the hook-side open end of the first leg 5

20 beginning of the hook side of the knitting machine needle 1

21 reduction of the cross-section of the rod

Cross section of 22 bar

23 adjacent to the predetermined breaking zone 9

24 adjacent to the predetermined breaking section 9

25 side wing

Height-reducing profile of dimension 26 height of bar in z-x plane

27 opening angle of reduced height

28 first transition point

29 second transition point

30 fourth section of the rod 3

31 fifth section of the rod 3

Channel base 32 of 32 needle beds 16

33 drive section

Force F

In the X height direction

Y width direction

Z longitudinal direction.

Claims

1. A needle (1) of a knitting machine comprising at least the following features:

a hook (2) for forming a loop, which bounds the shank (3) in the longitudinal direction (z) of the shank (3) and which terminates in a hook tip (4),

a first drive section (33) following the hook (2) in the longitudinal direction (z) of the lever (3),

it is characterized in that

A predetermined breaking section (9) for separating the hook (2) from the first drive section (33),

the predetermined breaking section is formed by a section of the rod (3) extending in the longitudinal direction (z),

and the predetermined breaking section is completely located in a first lever section (10) which extends in the longitudinal direction (z) of the lever (3) between the tip (4) of the needle hook (2) and the first drive section (33).

2. Knitting machine needle (1) according to claim 1, characterized by the fact that

A predetermined breaking section (9),

the predetermined breaking section breaks under a load acting at the needle hook (2) with a force that is less than 80% of the force in which a needle of identical construction is permanently deformed without the predetermined breaking section.

3. Knitting machine needle (1) according to claim 1 or 2, characterized by the fact that

A latch (6) which is rotatably hinged at the lever (3) in such a way that it closes off the interior of the hook (2) in its closed position (7) and the tip of the latch (6) points in its back-up position (8) in the longitudinal direction (z) of the lever (3) towards the drive section (33).

4. Knitting machine needle (1) according to claim 3,

the predetermined breaking section (9) is completely located in the second rod section (11),

wherein the second lever section (11) extends in the longitudinal direction (z) of the lever between the position of the latch tip (12) in the standby position of the latch (6) and the hook-side beginning (19) of the first drive section (33).

5. Knitting machine needle (1) according to claim 3 or 4,

the predetermined breaking section (9) is completely located in the third rod section (13),

the third lever section begins in the longitudinal direction (z) of the knitting machine needle (1) at a point which is spaced in the direction of the first drive section (33) by between 1.5 and 2.5 latch lengths from the articulation point (14) of the latch (6),

and the third lever section ends in the longitudinal direction (z) of the knitting machine needle (1) at a point which is spaced between three and four latch lengths from the articulation point (14) of the latch (6) in the direction toward the first drive section (33),

wherein the latch length is the distance between the hinge point (14) of the latch and the latch tip (12).

6. Knitting machine needle (1) according to one of the preceding claims,

the hook-side opening (19) of the first drive section (33) has a spacing in the longitudinal direction (z) of at least 75mm from the hook-side opening (20) of the needle (1) in the longitudinal direction (z) of the shank (3).

7. Knitting machine needle (1) according to one of the preceding claims,

the drive section (33) is formed by a foot (5) which projects beyond the rod (3) in the direction of the positive height (x) of the rod (3).

8. Knitting machine needle (1) according to one of the preceding claims,

the predetermined breaking section (9) has a reduction (21) of the rod cross section perpendicular to the longitudinal direction (z).

9. Knitting machine needle (1) according to one of the preceding claims,

the predetermined breaking section (9) has a reduction (21) of the rod cross section (22) due to a reduction of the rod dimension in the height direction (x).

10. Knitting machine needle (1) according to claim 9,

a predetermined breaking section (9) having a minimum of 10% and a maximum of 50% of the reduction of the rod dimension in the height direction (x) at its location with the maximum reduction (21) of the rod cross section (22).

11. Knitting machine needle (1) according to one of the claims 9 to 10,

the reduction of the rod size in the height direction (x) has a course which has a triangular or trapezoidal shape (26) in a plane which is unfolded through the height direction (x) and the longitudinal direction (z), the flanks (25) of the shape having an opening angle of 60 to 120 ° to each other.

12. Knitting machine needle (1) according to one of the preceding claims,

the predetermined breaking section (9) is at least partially made of a material having a lower breaking elongation than the remaining sections (10,11,13) of the rod (3) and in particular than the regions (23,24) of the rod (3) adjacent to the predetermined breaking section (9).

13. A knitting system (15) comprising at least the following features,

a needle bed (16) with guide means (17) and at least one passage base (32) set to accommodate the knitting machine needles (1) and to support and guide the knitting machine needles (1) in their longitudinal direction (z) in the case of intermittent movement thereof,

at least one cam (18) for transmitting a force to at least one first drive section (33) of a knitting machine needle (1) accommodated in the needle bed (16),

a plurality of knitting machine needles (1), wherein each of these knitting machine needles (1) comprises in its respect the following features:

it is characterized in that the preparation method is characterized in that,

at least one of the needles (1) of the knitting machine has a predetermined breaking section (9) for separating the hook (2) from the first drive section (33),

the predetermined breaking section is formed by a first section (10) of the rod (3) extending in its longitudinal direction (z),

and the predetermined breaking section is located completely in the first lever section (10) which extends in the longitudinal direction (z) of the lever (3) between the tip of the hook (2) and the hook-side opening (19) of the first drive section (33).

14. Knitting system (15) according to claim 13, characterized in that the guiding means (17) and at least one channel base (32) of the needle bed (16), the at least one triangle (18) and the positions of the first driving sector (33) and the preset breaking sector (9) at the at least one knitting machine needle (1) are coordinated such that

The at least one knitting machine needle (1) is moved out of the guide means (17) and the at least one channel base (32) at least at times during the knitting operation so far that

The guide means (17) and the at least one channel base (32) no longer support, at least in part, a predetermined breaking section (9) of the at least one knitting machine needle (1).