BRPI0821044B1 - METHOD FOR PRODUCING A MESH PRODUCT ON A CIRCULAR KNITTING MACHINE AND CIRCULAR KNITTING MACHINE - Google Patents

Description

(54) Title: METHOD TO PRODUCE A KNITTED PRODUCT IN A CIRCULAR KNITTING MACHINE, AND, CIRCULAR KNITTING MACHINE (51) Int.CI .: D01H 13/22; B65H 63/06; D04B 9/14; D01H 5/38 (30) Unionist Priority: 06/12/2007 DE 102007059003.4, 07/02/2008 DE 102008008210.4 (73) Holder (s): SIPRA PATENTENTWICKLUNGS-UND BETEILIGUNGSGESELLSCHAFT MBH (72) Inventor (s): WOLFGANG BAUER; AXEL FLAD; CHRISTINE ABT-SEITEL “METHOD TO PRODUCE A KNITTED PRODUCT IN A CIRCULAR KNITTING MACHINE, AND, CIRCULAR KNITTING MACHINE”

The invention relates to a method for producing a knitted product on a circular knitting machine (1) with a rotating needle cylinder (2) having knitting tools (3) and at least one knitting system (4), wherein the meshes are formed by the knitting tools (3) being lifted into a fiber receiving position (32) when passing through the knitting system (4) and then being removed again to receive a stretched fibrous material (6) by a drawing device (9), and in which the fibrous material (6) is monitored in a location positioned in front of the knitting system (4) in a fiber transport direction (v), and to a knitting machine circular comprising: a rotating needle cylinder (2), knitting tools (3) arranged in it, at least one knitting system (4) arranged on the periphery of the needle cylinder (2), a drawing device (9 ) associated with the knitting system (4) to feed a stretched fibrous material (6), means for raising the knitting tools (3) in a fiber receiving position (32) as they pass through the knitting system (4) and then removing them again to receive the fibrous material (6) fed by the drawing device (9), and a sensor unit (15) arranged in front of the knitting system (4) in a fiber transport direction (v) to monitor the fibrous material (6) .

The known circular knitting methods and machines, referred to as spinning - knitting machines, of the type of interest here (for example, PCT WO 2004/079068, PCT WO 2007/093165 A2, PCT WO 2007/093166 A2) are distinct in that that the knitted product is not produced from ordinary twisted yarns, but from fibrous material

Petition 870180028901, of 10/04/2018, p. 13/55 provided in the form of a tape, roving tape or the like, which, before forming the meshes, is drawn into a pre-selected fineness by means of a drawing system known from spinning technology and after leaving the drawing device is brought to an appropriate state for transportation to common or similar knitting systems by means of a spinning device.

In a particularly preferred variant, the spinning device contains a twisting element and a transport or spinning tube connected thereto. The fibrous material is thus converted into a temporary yarn provided with true twists, which allows it to be transported favorably over long distances. Just before processing by knitting needles or the like, the twists are reduced to zero again (false twisting effect), as a result of which an extremely smooth knit product is obtained.

Alternatively, however, the spinning device can also be configured to form a permanently bonded wire, in particular a so-called unconventional wire, and be configured, for example, as an air spinning device (check, for example) , EP 1 518 949 A2 and EP 1 826 299 A2). This yarn also has some twists or curls, but like a strand or cover yarn, for example, it is not a yarn in the classic sense. The spinning operation is preferably configured so that, as in the case described above of the temporary yarn, a ribbon which is sufficiently firm for the desired transport purposes is formed, while a sufficiently soft knitted product is still obtained.

As in the case of conventional knitting methods and machines, there is a disadvantage that a rupture or weakening of the fibrous material causes holes in the knitted product or even leads to tubular knitting.

Petition 870180028901, of 10/04/2018, p. 14/55 formed to come out of the knitting elements. This is caused by the knitting elements being lifted still in a fiber receiving position even though no ribbon is being provided, and the previously formed stitches being ejected from the knitting elements as a result. The term expulsion should be understood to mean that, without taking into account the type of knitting elements (for example, tongue needles, compound needles, hook-shaped elements, etc.), as they are raised in a position of After receiving the fibers, the old stitches first slide over a knitting element blade, and when the knitting elements are then lowered, they slide over their hooks, and the newly formed stitches slide out of the knitting elements completely.

Thus, circular knitting methods and machines of the aforementioned type are known (DE 10 2005 031079A1), in which the feeding of the fibrous material is monitored by breaking the fiber with a monitoring device that has filament sensors. If a monitoring device detects a break in the fibrous material, then an error signal intended to shut down the knitting machine and the drawing device is generated. The sensors of the known monitoring device are arranged in a location that is in front of the drawing device in the direction of transport of the tape. This would prevent the drawing device from running empty and remove the need for complicated insertion of a new tape, which is associated with several disadvantages. In addition, the knitting machine must be stopped before the end of the ribbon reaches the respective knitting systems.

In addition, it has already been proposed (DE 10 2006 056 895) to configure the circular knitting machine of the type mentioned above so that a single knitting system is switched to a non-knitting operation if fibrous material is not present and to control the transition automatically

Petition 870180028901, of 10/04/2018, p. 15/55 using a filament monitor. This results in the formation of holes in the mesh product with a length that is dependent on the time actually required for the transition to be complete. However, according to another proposal (DE 10 2007 041 171 A1), this can be avoided substantially by preventing the previously formed stitches from being ejected from the knitting tools when the ribbon breaks.

A problem not yet solved in the application of circular knitting methods and machines of the types mentioned above is that knitted products produced with fibrous materials of the types described often have an undesirably high number of visible flaws that are not caused by a break in the material fibrous. These faults must, on the contrary, be attributed to a missing quality of the fibrous material and consist of thin and thick areas in irregular sequence in the mesh product. It is assumed that, and this has also been confirmed by tests, that the real cause of this fact is that the fiber thickness and / or the fiber mass per unit length of the fibrous materials available on the market are subject to comparatively high fluctuations - seen in its longitudinal or transport direction. Thus, either mesh products of irregular quality must be accepted or costly measures must be taken to remove the flawed areas of the mesh product or to make available raw materials in the form of tapes, roving tape or the like that do not have any permissible deviations in quality for the mesh formation process.

Working with these facts, the technical problem that forms the basis of the invention is to structure or configure the aforementioned knitting methods and machines, so that failures in the finished knitted product, caused by fluctuations in the quality of the fibrous material, are avoided.

This problem is solved according to the invention by

Petition 870180028901, of 10/04/2018, p. 16/55 following aspects: by the method to produce a knitted product in a circular knitting machine (1) with a rotating needle cylinder (2) having knitting tools (3) and at least one knitting system (4), wherein the meshes are formed by the knitting tools (3) being lifted into a fiber receiving position (32) when passing through the knitting system (4) and then being removed again to receive a stretched fibrous material (6) by a drawing device (9), and in which the fibrous material (6) is monitored in a location positioned in front of the knitting system (4) in a fiber transport direction (v), where the monitoring is directed for the quality of the fibrous material (6), and that when a section (6A) of the fibrous material with an impermissible deviation from a pre-selected quality is detected, the reception of this section of fibrous material (6a) by the knitting tools ( 3) is avoided, in which the reception of the fibrous material (6a) by the knitting tools (3) is avoided by interrupting the formation of meshes in the knitting system (4), in which the formation of meshes in the knitting system (4) is interrupted by the knitting tools (3) being driven beyond the fiber receiving location (33) without expelling any of the previously formed meshes; and the circular knitting machine comprising: a rotating needle cylinder (2), knitting tools (3) arranged in it, at least one knitting system (4) arranged on the periphery of the needle cylinder (2), a drawing device (9) associated with the knitting system (4) for feeding a stretched fibrous material (6), means for raising the knitting tools (3) in a fiber receiving position (32) as they pass by the knitting system (4) and then removing them again to receive the fibrous material (6) fed by the drawing device (9), and a sensor unit (15) arranged in front of the knitting system (4) in a fiber transport direction (v) for

Petition 870180028901, of 10/04/2018, p. 17/55 monitor the fibrous material (6), where the sensor unit (15) is configured to monitor the quality of the fibrous material (6) and means to emit an error signal if the quality deviates from a tolerance range preselected are provided, in which it has means of controlling the machine (38) so that the formation of meshes in the knitting system (4) is interrupted after the emission of an error signal by the knitting tools (3) being directed beyond the receiving position of the fibers (33) without any previously formed meshes being ejected.

The method according to the invention has the advantage that as a result of monitoring the quality of the fibrous material in a location positioned in front of the knitting system, non-permissible deviations in quality in the fibrous material can be detected soon, and also after a not permissible deviation in quality has been detected, a section of fibrous material with this deviation in quality can be reliably prevented from being inserted into the knitting tools. This provides the possibility of not including a section of fibrous materials with non-permissible deviations in quality in the mesh product at all and, on the contrary, removing them from the fibrous material beforehand. In addition, using the circular knitting machine according to the invention, this method can be automated with comparatively simple means, in particular if a sensor unit monitoring the quality of the fibrous material is arranged at such a distance in front of the knitting system that the knitting tool holder (needle cylinder) can also carry out a complete revolution before a section of fibrous material with the non-permissible deviation in quality reaching the knitting system. Furthermore, as a result of this, according to a preferred modality, it is always possible to interrupt the formation of the meshes or to continue the same again in a peripheral section, a so-called turning point, of the support of

Petition 870180028901, of 10/04/2018, p. 18/55 knitting tool provided for this. The ends of fibers formed in the mesh product as a result of interruption or a new beginning of the formation of meshes and undesirable sections of the mesh product only then come to position themselves at the point of change, which can be used to cut the mesh open tubular after the knit fabric is finished, and thus does not impair the uniform appearance of the rest of the knitted product.

Other advantageous aspects of the invention are evident from the subclaims.

The invention is explained in more detail below under 10 exemplary modalities in association with the accompanying drawings.

Figure 1 shows schematically a first exemplary embodiment of a circular knitting machine according to the invention for the production of a knitted product with stretched fibrous material;

Figure 2 shows the circular knitting machine according to Figure 1 in a different operating state;

Figure 3 is a plan view on the circular knitting machine according to Figures 1 and 2 with an omitted guide cylinder;

Figure 4 shows a mesh product with a section formed by a change point;

Figure 5 shows an exemplary embodiment for the sensor unit of the circular knitting machine according to Figures 1 to 3;

Figure 6 is a front view of the cam parts of the circular knitting machine according to Figures 1 to 3;

Figure Ί is a view corresponding to Figure 1 of a second exemplary embodiment of a circular knitting machine according to the invention;

Figures 8 to 10 show different modalities of an extraction medium suitable for circular knitting machines according to

Petition 870180028901, of 10/04/2018, p. 19/55

Figures 1 to 7; and

Figure 11 is a cross-sectional view of a preferred embodiment of a suction tube for the extractor medium according to Figures 8 to 10.

Figures 1 and 2 are highly schematic partial views of a circular knitting machine 1 with a knitting tool holder, in particular a needle cylinder 2, in which common knitting tools, for example knitting needles 3 configured as tongue needles , are mounted in a displaceable manner, which has hooks 3a, pivoting tongues 3b and blades 3b, and in a knitting position, hereinafter referred to as knitting system 4, they can be moved in an appropriate fiber receiving position to receive the material fibrous 6 by means of cam parts 5 (not shown in more detail). The fibrous material 6 is fed to the circular knitting machine 1, which can be configured, for example, as a simple circular knitting machine, from storage containers 7 such as cans, supply spools or the like.

The fibrous material 6, which in the exemplary embodiment preferably consists of a tape from a roving frame, is fed to a drawing device 9 by means of transport (not shown) and possibly a guide cylinder 8 only as shown in Figures 1 and

2. Each of a plurality of knitting systems 4, of which only one is as shown in Figures 1 to 3, is provided with such a drawing device 9, which has pairs of drawing cylinders, for example, in a known manner . In the exemplary embodiment, this is the three-roll drawing device, in which a pair of feed rollers I forms a pre-stretch zone with a central roll pair II configured as a pair of double belt rollers and the pair of rollers II forms a main draft zone with a pair of withdrawal cylinders III.

Petition 870180028901, of 10/04/2018, p. 20/55

The fibrous material from the drawing device 9 which substantially consists of untwisted fibers arranged parallel to each other is fed to an associated knitting system 4 in a known manner, preferably by means of a spinning or conveying device which receives the general reference 10. According to an exemplary embodiment, currently considered to be the best, the transport device 10 contains at least one twist element 11 and a spinning or transport tube 12 connected to it which ends in a filament guide 14, which, as usual, is arranged close in front of the knitting tools 3 and is arranged so that the fibrous material 6 coming out of a hole in the filament guide 14a is inserted into the hooks 3a of these knitting tools 3 which are driven or raised in a position of receiving the fibers by the cam parts 5 at the receiving point of the fibers visible in Figure 1. For this purpose, common means, in particular c comprising cam pieces 5, they are provided on the knitting system 4 in the known manner, whereby the knitting needles 3 are first raised to the receiving position of the fibers, where, at the same time, the previously formed meshes on they slide over the needle blades 3 c (Figure 1) and under the tongues 3b, then receive the fibrous material

6 and are subsequently removed at least in an intermediate position or are removed in a non-knitting position to expel the old stitches and form new stitches. This non-knitting position is as shown in Figure 2, according to which, as compared to Figure 1, the needle hooks 3a are clearly arranged below a filament guide hole 14a, from which the fibrous material 6 is discharged.

The spinning device 10 or the transport device comprising the twisting element 11 and transport tube 12 serves to initially convert the discharged tape from the drawing device 9 into

Petition 870180028901, of 10/04/2018, p. 21/55 a temporary yarn with true twists in a known way. The temporary yarn retains the torsions substantially until the end of the transport tube 12, when these torsions are then released again, that is, they are reduced to zero (false torsion effect), until the last fibrous material received enters the knitting needles 3 Thus, a compressed, but virtually untwisted ribbon, enters the knitting needles 3.

Alternatively, other spinning devices of the type mentioned above can also be provided.

Circular knitting machines of the type described are known, for example, from the documents mentioned above, which are incorporated herein by reference to avoid repetition.

The purpose of the invention is to prevent the occurrence of the thin and thick areas mentioned above in the finished knitted product. For this purpose, a very general proposal, according to the invention, is to first examine the fibrous material 6 for the required quality aspects, in particular fluctuations in thickness and mass, before it reaches the knitting system 4, and when the sections of fibrous material marked by non-permissible deviations of a pre-selected quality are detected, to prevent these defective fibrous material sections from being inserted into the knitting needles

3. This can be achieved, for example, by monitoring the fibrous material 6 using an appropriate sensor unit 15 and when detecting a failure, which is indicated schematically in Figures 1 and 2 by a dot and provided with reference 6a, the meshing process is interrupted, the gap 6a is removed from the fibrous material 6 and the meshing process is then continued. The interruption of the knitting process can be achieved, for example, by directing the knitting tools 3 over the respective knitting system 4 beyond the fiber receiving point from the moment a failure 6a is

Petition 870180028901, of 10/04/2018, p. 22/55 detected without expelling any previously formed meshes and without receiving fibrous material 6, and for this purpose directing them to a circular movement path, for example.

The described procedure causes the delicate fibrous material 6 to tear after the knitting needles 3 are directed into the circular motion position. The result of this is that the tip of fibrous material appears in the mesh product whenever a failure 6a has been detected in the fibrous material 6. If the knitting needles 3 are raised again in the receiving position of the fibers at a later point in time in order to continue the knitting process, a tip of fibrous material occurs once again in the knitted product. These tips are visible in the mesh product and can cause undesirable imperfections in the mesh product, depending on the frequency at which a failure occurs 6a and the length of the tips formed, etc.

To avoid the uncontrolled formation of these fiber ends in the mesh fabric, another proposal, according to a particularly preferred embodiment of the invention, is to monitor the fibrous material 6 for fluctuations in thickness and mass in a location at a distance from the knit 4 respective measurements in a fiber transport direction v, which is at least as long as the length of the fibrous material 6 used per rotation of the needle cylinder 2. This allows the interruption of the knitting process to always be done in one and the same region, referred to here below as a change point, on the periphery of the needle cylinder 2. This change point is indicated in Figure 3 with reference 2a and is defined, for example, by at least one, preferably a number pre-selected, from the knitting needles 3 located adjacent to each other. In addition, it is proposed, according to the invention, to always interrupt the knitting process with a

Petition 870180028901, of 10/04/2018, p. 23/55 knit 3 located inside the change point 2a, so that the resulting fiber ends are always dragged by the last knitting needle 3 located directly in front of it. None of the knitting needles 3 after this needle 3 are raised to receive fibers. If the turning point

2a is always formed by the same, for example 20, knitting needles 3, so in a finished 16 mesh product (Figure 4) this corresponds to a product section 17 composed of the same number of adjacent strands. This section can be used in the further processing of the tubular mesh product 16 as the section, along which the mesh product 16 is cut open.

Thus, the fiber tips that are positioned in the region of change point 2a are automatically concentrated in the edge regions of the cut 16 mesh product and that can be cut without any significant damage to the 16 mesh product.

A corresponding procedure is to continue the meshing process after an interruption in the supply of the fibrous material. The possible inevitable formation of a fiber tip ai on the first needle 3 for knitting respectively then results in a filament tip going to position itself in the region of section 17 of the mesh product 16 which corresponds to change point 2a.

In the case where a spinning device 10 according to Figures 3 or any other suitable spinning device is provided, it may be expedient that the selected distance of the sensor unit 15 from the knitting system 4 is greater than fibrous material 6 used by rotating the needle cylinder 2 by a dimension corresponding to the distance of the drafting device 9 from the knitting system 4. This would ensure that as a result of an interruption of the mesh formation last performed after a rotation of the needle cylinder needle 2, but within shift point 2a, the detected fault 6a would still not have reached the

Petition 870180028901, of 10/04/2018, p. 24/55 wiring 10, in particular the twisting element 11, for example. In this way, for example, thick areas in the fibrous material 6 that are outside a tolerance range can be prevented from causing obstruction or even damage to the spinning device 10.

An exemplary embodiment of a circular knitting machine according to the invention hitherto considered to be the best is described below for the automation of the described processes.

According to Figure 4, the evident sensor unit 15 of Figures 1 to 3 is configured to monitor the quality of the fibrous material 6.

In the scope of the present application, the term quality is understood to mean the properties of the fibrous material 6 that affect the knitted product 16 made with it in the circular knitting machine 1 and in particular caused by the mentioned fluctuations in thickness and / or mass of fibrous material 6.

According to Figure 5, the sensor unit 15 includes a pivotally mounted lower cylinder 18, which is provided with a guide channel as a groove 19, on its wrap surface and is pivotal about a fixed axis 20. A second cylinder 21, which is movable with respect to the fixed axis 20, in the direction of the double arrow 23, is mounted a short distance from the surface of the cylinder envelope 18 to be rotatable about axis 22 parallel to axis 20. The rollers cylinders 18, 21, are preferably fixed in rotation by means of a motor (not shown). In addition, the second cylinder 21 is pressed against the first cylinder 18 by its gravity and / or by means of a spring (not shown), as a result of which the fibrous material 6 moved through the guide channel 19 is compressed to a degree bigger or smaller.

The position of the shaft 22, and thus the spacing of the peripheral faces of the two cylinders 18, 21, is determined by means of a probe 24, which is requested in the direction of the peripheral face of the second cylinder 21 in

Petition 870180028901, of 10/04/2018, p. 25/55 a housing 25 of the sensor unit 15. If a section of fiber material with a thin or thick area or a changed mass moves through the channel and guide 19 during transport of the fibrous material 6, then the second cylinder 21 it is lowered or raised with respect to the first cylinder 18 more severely than applicable to the fibrous material 6 with the desired quality. The change in position caused by this is measured by means of the probe 24 and an electronic unit connected to it and housed in the housing 25 and is converted into an analog or digital signal, as required, which indicates the magnitude of the respective deviation in thickness or mass of a pre-selected quality.

In an evaluation unit 26 (Figure 1), which is arranged in the housing itself 25 or outside and having a microprocessor, for example, the measurement signal emitted by a sensor unit 15 is examined to determine whether the fiber thickness or fiber mass rests within a pre-selected tolerance range. If the fiber thickness or fiber mass is outside this tolerance range, then an error signal is issued by the evaluation unit 26 which indicates that the section of fibrous material with a failure 6a (Figure 1) distinguished by an impermissible deviation of a desired quality, in particular a non-permissible thickness or mass of the fibrous material 6, has just passed through a sensor unit 15. The error signal is distributed on output lines 27, 28 (Figure 1) of the evaluation unit 26 and is used in the manner explained above to prevent the detected fault 6a from being worked on the mesh product.

Sensor and evaluation units 15, 26 suitable for the specified purpose are generally known to the person skilled in the art in different variants of spinning and drawing device technology (eg DE 28 50 775 A1, DE 32 37 371 A1, DE 38 26 861 A1, DE 199 50 901 A1, DE 102 04 328 A1, GB 2 062 704 A) and thus need not be explained in

Petition 870180028901, of 10/04/2018, p. 26/55 more details.

To prevent the knitting needles 3 from receiving sections of fibrous materials with a failure 6a detected by the sensor unit 15, each knitting system 4 is provided with cam pieces 5, the course of which is as shown in Figure 6. It is considered, in Figure 6 that, as in ordinary knitting machines, the knitting needles 3 themselves or selectors or auxiliary needles associated with them are provided with joints 29, which cooperate with the cam pieces 5 arranged in the knitting systems 4. As a As a result, all knitting needles 3 are raised, for example, first out of a simple operating or non-knitting position along an elevator path 30 to the fiber receiving position evident in Figure 1 and are then removed again at along a withdrawal path 31 to move them in the simple operating position after passing through a coulier rejection path 32. The movement of the knitting needles 3 in relation to the cam pieces 5 occurs n the direction of an arrow w in Figure 6. The fiber receiving position is reached near a higher point 33 of the elevator path 30 and serves to arrange the knitting needles 3 in a position where they are raised to such a distance that the meshes formed in a previous knitting system 4 and located on their hooks 3a slide over the open tongues 3b over the needle blade 3c (Figure 1), while at location 34, for example, it indicates the position of the guide hole of filament 14a, the fibrous material 6 can be fed so that it is inserted into its hooks 3a last during the withdrawal of the knitting needles 3. The withdrawal of the knitting needles 3 serves to pull the fibrous material 6 inserted through the meshes previously formed hanging on the needle blades 3c and at the same time completely expelling the old stitches on the hooks 3a as the latch 3b closes.

Petition 870180028901, of 10/04/2018, p. 27/55

In addition, according to Figure 6, an extension 35, where the junctions 29 can be selectively guided to the elevator path 30 or within a simple operating position 36, is provided at the beginning of the elevator path 30, as indicated for some junctions 29a. For example, an electromagnet 37 arranged in the region of branch 35 can serve as a selector device. In the simplest case, this electromagnet 37 can be controlled so that all the needles 3 on the respective knitting system 4 are guided in the simple operating path 36 following an error signal from the evaluation unit 26. This is indicated in the Figures 1 and 2 by a conductor 39 that connects a control means of the machine 38 to the respective cam pieces 5 having the electromagnet 37. The knitting needle guide 3 in the simple operating path 36 prevents the old stitches from being ejected and the section of fibrous material with faults 6a to be incorporated into the 16 mesh product. This state is maintained, for example, until fault 6a passes through the filament guide 14 and can no longer be taken by needles 3. Needles 3 are then guided in the lift path 30 again by actuating an electromagnet 37 accordingly, so that the normal knitting process can be continued with perfect fibrous material 6.

In a particularly advantageous way, the control of the knitting needles 3 in the region of the branch 35 is carried out so that the transition from the raised path 30 to the simple operating path 36 only occurs when the change point 2a as shown in Figure 1 reaches extension 35. For this purpose, the output line 27 is connected to the machine 38 control means of the circular knitting machine shown in Figures 1 and 2. The error signal of the evaluation unit 26 indicates to the machine control means 38 that a corresponding control signal must be sent to the electromagnet 37 as soon as the change point 2a reaches the knitting system 4, that is, as soon as a knitting needle 3, defining the start of the change point 2a, for example

Petition 870180028901, of 10/04/2018, p. 28/55 example knitting needle No. 1, reach branch 35. Control systems of this type are generally known in standard control systems of circular knitting machines and thus do not need to be applied in more detail. The changing points of the type of interest here are also applied, for example, in conjunction with filament changers, when inserting separation filaments or in the production of knitted articles with different knitting patterns.

If, as required by way of example above, the sensor unit 15 is at a distance from the knitting system 4 which is at least precisely as extensive as the fibrous material used by rotation of the needle cylinder 2, then the change 2a in any event reaches the respective knitting system 4 at a time before the failure 6a has reached the knitting system 4. Thus, the redirection of the knitting needles 3 also occurs before the failure 6a reaches the knitting system 4.

Due to the property explained above that the fibrous material 6 will tear if the knitting needles 3 are guided in the circular motion path 36 (Figure 6), this tearing occurs in a controlled manner according to the invention and so that the tip of resulting fibrous material start at a knitting needle 3 of change point 2a or as early as at a knitting needle 3, which directly precedes this knitting needle and further processed fibrous material 6 into a knit in an orderly fashion. The precise location of the break in the fibrous material 6, i.e. the length of the resulting fibrous material tip hanging freely in the mesh product, is not critical, because section 17 of the mesh product 16 associated with change point 2a is cut, as mentioned.

Any filament tips present that result from guiding the knitting needles 3 in the simple operating path 36 thus become part of section 17 with which the last knitting needle 2 is also associated

Petition 870180028901, of 10/04/2018, p. 29/55 according to the invention. Thus, in each case, a section 17 results which is cut open and removed after the tubular mesh product 16 is finished, so that the remaining part of the mesh product 16 is free from failures.

If, after this process involving breaking the fiber, fault 6A has been removed from the fibrous material 6 or has passed beyond the knitting needles 3 without being caught by them, then the electromagnet 37 is checked again over the respective knitting system 4 , so that the knitting needles 3 are guided into the elevator path 30 at branch 35. Because the fibrous material has been torn, it must be inserted once again into the knitting needles 3 during this change, as a result of more points of fibrous material are formed. Thus, according to the invention the knitting needle 3 located within the change point 2a is selected as the first knitting needle 3 to be guided into the lift path 30. All knitting needles 3 following this knitting needle 3 they are likewise guided into the elevator path 30. As a result, the fiber tips formed by the recently started knitting operation are also positioned in section 17 of the 16 mesh product, so that they can be removed from the latter.

To ensure that the knitting process is automatically interrupted and continued again when a failure 6a occurs without the failure 6a being captured by the knitting needles 3, another development of the invention provides that at least one suction tube 40 (Figures 1 to 3), which ends close behind the knitting needles 3, for example, and is connected to an outlet (not shown) working under pressure, is arranged in a location located behind the knitting needles 3 and opposite the associated filament guide 14. The suction tube 40 has no effect during a normal meshing operation. However, if a failure 6a is detected in the fibrous material 6, then the suction tube 40 serves the

Petition 870180028901, of 10/04/2018, p. 30/55 in order to cause the rupture of the fibrous material 6 resulting from the guide of the knitting needles 3 within the simple operating path 36 comparatively quickly and extracting and removing the fibrous material 6b (Figure 2) still provided by the drawing device 9.

This situation is as shown in Figure 6. Here it is considered that fault 6a already moved far from Figure 1 in the direction of knitting system 4 led to an error signal from evaluation unit 26, change point 2a has already passed by the knitting system 4 and consequently the knitting needles 3 in this knitting system 4 are no longer raised in the fiber receiving position, as shown in Figure 1, but remain, for example, in the simple operating path 36 (Figure 6) . Thus, because the needle hooks 3a pass through the filament guide 14 below a filament guide hole 14a, the fibrous material 6a that is still being fed but is no longer meshed is received by the suction tube 40. As a As a result of this, the fibrous material 6 which is at the same time dragged by the last knitting needle 3 to knit slots and form a comparatively short fibrous material tip after the last knitting needle 3 to knit them.

If instead of failure 6a the fibrous material 6 is moved at an unaltered transport speed in the direction of arrow v, then after a complete rotation of needle cylinder 2, during which the knitting needles 3 were directed in the circular motion path 36 , fault 6a passed safely through the knitting system 4 and reached the suction tube 40. Thus, the mesh formation can be started again after the rotation of the needle cylinder 2 as soon as the change point 2a has passed through the system to knit 4 once again. Thus, it is automatically ensured that fault 6a is not dealt with in the 16 mesh product, but is directed outwards through the outlet.

Petition 870180028901, of 10/04/2018, p. 31/55

Between the drawing devices 9 and the knitting systems 4, the circular knitting machine 1 described on the basis of Figures 1 to 3 is provided with a respective spinning and transporting device 10 which has the spinning or twisting element 11 or the like , for example. Because this twisting element 11 can become blocked or even damaged by larger faults 6A (thicker), the sensor unit 15 is arranged further away from the knitting system 4 than the fibrous material used 6 by rotation of the needle cylinder, preferably by a dimension corresponding to the distance between the drawing device 9 (or its pair of withdrawal cylinders III) and the knitting system 4. This ensures that when the change point 2a reaches the knitting system, a fault 6a detected by sensor unit 15 is further arranged in front of the twisting element 11b in the fiber transport direction v. The procedure is analogous when other suitable wiring devices are applied. In such cases, the following procedures are possible.

Because this can be determined by means of the evaluation unit 26 and the sensor unit 15 described, whether or not a fault detected 6a large or small (thick or thin), it is required that the section of fibrous material containing a large fault 6a be transported a short distance in front of the twisting element 12 at most. In this case, as shown schematically in Figures 1 and 2, the evaluation unit 26 is also expediently connected to the control systems for the engines (not shown) of the drafting system cylinders I to III to shut down these engines and so the complete drawing device 9, after a period of time corresponding to the fault distance 6a, travels from the sensor unit 15 to the twisting element 11.

In this case, the knitting needles 3 are also guided in the circular motion path 36 (Figure 5) as described above. This

Petition 870180028901, of 10/04/2018, p. 32/55 now allows the operator to remove fault 6a manually, before it passes to wiring device 10. An automatic fault removal would also be conceivable.

After removing the fault, the drawing device 9 is first switched on again. If a continuous fiber transport of the fibrous material 6 then occurs again and possibly the new front edge or the dividing area or the like of the fibrous material 6 has been stretched in the suction tube 40, the meshing process is continued as soon as the change point 2a runs to the knitting system 4 again. This can be done with a manual key 41 (Figures 1 and 2), which is connected to an evaluation unit 26 or also directly to the machine control means 38 and is configured so that the guide of the knitting needles 3 for the lift path 30 is delayed until change point 2a reaches the respective knitting system. In addition, the manual key 41 also serves expediently to start the motors of the drawing devices 9 again when it is activated.

To also automate this procedure in other respects, a sensor 42, which is suitable for detecting the presence or absence, and particularly the movement and stop, of the fibrous material

6 to be fed into the knitting system 4, it is expediently arranged in the space between the drawing device 9 and the knitting system 4. This monitoring can take place based on the fibrous material 6 coming out of the transport tube 12, based on a temporary wire or the like guided in the transport tube 12. In the latter case, the respective transport tube 12 preferably has a window or an intermediate section made of a totally transparent material, through which the temporary wire can be detected by sensor 42. This is particularly advantageous if sensor 42 is arranged as close as possible to the respective

Petition 870180028901, of 10/04/2018, p. 33/55 so that ruptures or other failures occurring in the same can also be discovered in the fibrous material 6.

Common sensors used in normal knitting machines such as filament monitors that emit an electrical error signal when the fibrous material to be monitored is absent or stopped, can be provided as sensors. As soon as this error signal disappears and sensor 42 thus indicates that the drawing device 9 monitored by it is supplying fibrous material 6 again and that the fibrous material 6 is moving, that is, being transported in the direction of transport v, the electromagnet 37 can be controlled again the next time change point 2a passes through knitting system 4, so that knitting needles 3 are guided into lift path 30. The output signals generated by sensor 42 are fed to the evaluation unit 26 or directly to the machine control system 38 according to figures 1 and 2.

In addition, sensor 42 has the advantage that it can also indicate other undesirable defects. For example, a fault 6a, which was recognized by the sensor unit 15 as not being so thick and which, therefore, was allowed to pass without an error signal being issued, could still cause the twisting element 11 to clog and thus cause a rupture in the fibrous material 6 within the spinning device 10. In such a case, the fiber rupture is detected by sensor 42 and indicated with the consequence, for example, that the knitting needles 3 are guided into the circular motion path 36 immediately and without taking into account the current position of shift point 2a. However, because such a case appears comparatively rarely, the associated defects in the 16 mesh product are tolerable.

Alternatively to the exemplary mode described, it would be possible to raise the knitting needles 3 at change point 2a to an intermediate position, for example, a capture position, as shown

Petition 870180028901, of 10/04/2018, p. 34/55 schematically in figure 7, and this intermediate position moves them beyond the point of reception of the fibers 33 (Figure 5). There is no significant difference from this with respect to the remaining functions. However, it would be ensured that the space between the filament guide hole 14 and the suction tube 40 would also remain as free as possible during the passage of the knitting needles 3 located in the intermediate position so that the necessary succession force is not affected when a 6a fault occurs. For this reason, it is provided, in figure 7, to arrange the suction tube 4 at such a height above the needle cylinder 2 that it is arranged above the hooks 3a of the knitting needles when they are located in the capture position. In addition, the filament guide 14 is configured to be movable parallel to the knitting needles 3, as a double arrow x indicates. A conductor 43 indicates that the machine control means 38 is connected to a motor (not shown) for the filament guide 14. As a result, when an error signal from the evaluation unit 26 occurs and, for example, whenever the first knitting needle 3 of change point 2a is guided in the intermediate position, the filament guide 14 is always moved out of an occupied position during normal knitting, as shown in figure 1, in an elevated position evident from figure 7, where the hole of the filament guide 14a remains freely opposite the suction tube 40. The full suction force is consequently available as soon as the free end of the fibrous material 6 must be stretched into the suction tube 40. If, at a later stage, the knitting needles 3 are raised again in the fiber receiving position 33 (figure 6), then the filament guide 14 is moved backwards in the position according to figure 1 by the control means of machine 38.

Figures 8 to 10 show possible exemplary embodiments for the suction tube 40.

Petition 870180028901, of 10/04/2018, p. 35/55

It is assumed that, in Figure 8, similar to Figure 1, four adjacent knitting systems of a circular knitting machine 1 are each supplied with fibrous material 6 by a respectively associated drawing device 9. In contrast to Figure 1, however, two spinning and conveying devices 10a, 10b connected behind each other are present between the drawing devices 9 and each associated knitting system. In addition, all four drawing devices 9 are mounted on a common support 44 and are driven by the same motors (not shown). Each knitting system has an associated suction tube 40a to 40b, fixedly behind the knitting needles 3 which are opposite a filament guide 14 of the respective knitting system in the same way as in Figure 1.

Figure 9 shows an exemplary embodiment that substantially corresponds to Figure 8. In contrast to this, however, only a suction tube 40 is provided here which is arranged to pivot around an axis parallel to the knitting needles 3. A pivoting mechanism (not shown) for the suction tube 40 is provided with a motor connected to the machine control means 38. When a failure 6a is detected in the fibrous material 6, the suction tube 40 is pivoted behind the knitting needles

3 of the knitting system within the illustrated room, in which failure 6a occurred.

The possible positions of the suction tube 40 are indicated by dotted lines in Figure 9.

The exemplary embodiment according to Figure 10 corresponds to that according to Figure 9 with the difference that the suction tube 40 is attached to a rod 46, which can be moved back and forth perpendicularly to the knitting needles 3 and in direction of a double z arrow through a motor (not shown). As in the case of Figure 9, the motor is connected to the machine control means 38, so that, in

Petition 870180028901, of 10/04/2018, p. 36/55 a failure 6a, the suction tube 40 is moved behind the knitting needles 3 of the knitting system where the failure 6a occurred. The possible positions of the suction tube 40 are also indicated by dotted lines here.

Finally, Figure 11 shows a schematic front view of the suction tube 40 and an associated lift and withdrawal path 30, 31 configured according to Figure 6 for the knitting needles joints 29 3. The application of a suction tube 40 with a circular cross section has shown that, depending on how the suction tube 40 is curved towards the outlet (see, for example, Figure 1), the fibrous material 6 aspired tends not to be positioned in the center of the suction tube 40, but to position yourself again in an upper, lower or lateral section of this inner part. This can result in the disadvantage that, when the stitches continue to form after a fiber break, the fibrous material 6 does not occupy precisely the position that is beneficial for receiving the fibers by the first knitting needles 3 to perform the knitting. Thus, it is proposed that an inner wrap face of a suction tube 47 receives a flat oval shape, for example, as shown in Figure 11 and is arranged horizontally if the suction tube 47 is curved upwards or downwards, where the height of the suction tube 47 substantially corresponds to the thickness of the fibrous material 6. If the curvature is to one side, the long axis of the suction tube 47 can be arranged vertically instead of horizontally in Figure 11. As a result this, the fibrous material 6 always occupies a favorable position for the continuation of the mesh formation process in the suction tube 47 without the friction ratios being adversely affected by this.

The mentioned spacing of the sensor unit 15 from the knitting system 4 is determined expediently based on the respective number of knitting tools 3 on the needle cylinder 2, the material

Petition 870180028901, of 10/04/2018, p. 37/55 fibrous 6 used for each mesh formation and the drawing carried out on the drawing device 9. If, for example, a total of 2640 knitting needles 3 are present in the needle cylinder 2 and the amount of fibrous material 6 used by mesh respectively reaches 3 mm, then the fibrous material 6 used for rotation of the needle cylinder 2 reaches approximately 7920 mm. If a total draw (pre-draw and main draw) of approximately 50 times is aimed at the drawing device 9, then the sensor unit 15 can be arranged, for example, at a distance x of approximately 158, 4 mm from the pair of feed rollers I of the drawing device 9, that is 158.4 mm in front of the pair of feed rollers I in the fiber transport direction v. This distance x is calculated as x = [(number of knitting needles 3 in the needle cylinder · fiber used per mesh): drawing] and, in all circumstances, ensures that a failure 6a does not reach the respective knitting system 4 before to go through shift point 2a. Finally, it can be noted that the drawing in the drawing device 9 does not occur abruptly, but gradually between the pair of feed rollers I and the withdrawal roll III. With the inclusion of all these parameters, a distance from the sensor unit 15 from the respective knitting system can always be obtained which ensures that a measured failure 6a is carried at most as far as the knitting system 4, if after the fault detection 6a, the needle cylinder 2 makes one more complete rotation, as would be necessary if the change point 2a had just passed the respective knitting system 4 at the instant when the fault 6a was detected. However, if the fault 6a is required to be transported after a rotation of the needle cylinder 2 only just in front of the spinning device 10, then the distance from the sensor unit 15 must be correspondingly longer to also take into account the distance between the pair of withdrawal cylinders III of the device

Petition 870180028901, of 10/04/2018, p. 38/55 of stretch 9 (or of the spinning device 10) and the knitting system 4. Regardless of which types of faults 6a are monitored, it can also be advantageous to dimension the distance of the sensor unit 15 in each case of so that fault 6a is only carried to the spinning device 10. However, if the distance between the pair of withdrawal rollers III of the drawing device 9 and the knitting system 4 is comparatively large, an unnecessarily high consumption of material fibrous 6 can be associated with this distance, in particular if the fibrous material 6 is very irregular. Thus, it seems to be better, currently, to configure the evaluation unit 26 so that it can distinguish small (thin) 6a faults from large (thick) 6a faults. It is then possible to program the machine's control means so that small faults 6a are allowed to pass through it until the knitting system 4, while large faults 6a are only allowed to pass through it until the pair of withdrawal cylinders III. A corresponding procedure could be followed if large or small fluctuations in the mass are related.

Without taking this into account, it is evident that the incorporation of faults 6a in the knitting needles 3 can also be prevented by stopping the knitting tool holder 2 when an error signal appears or by immediately switching off the respective drawing device 9 or the complete set of drawing devices mounted on support 44 in Figures 8 to 10. In these cases, the gaps 6a would be removed manually or automatically, the fibrous material provided with a split point or the like and the meshing process could then be continued.

The described circular knitting methods and machines are also used according to the invention to introduce and / or automate a required change of cans, bobbins or other storage containers 7 for the fibrous material 6. For this, the sensor unit 15

Petition 870180028901, of 10/04/2018, p. 39/55 and / or the evaluation unit 26 are programmed in such a way that a particular error signal is always generated when the thickness of the fibrous material 6 is practically zero, that is, fibrous material 6 is no longer supplied. or with the rupture (comparatively unlikely) of the fibrous material at a location positioned in front of the drawing device 9 or with the respective storage container 7 running empty. In this case, the described guide of the knitting tools 3 in the circular motion position is started after the emission of such an error signal. In addition, the respective drawing device 9 or the respective drawing device group is switched off, preferably after a change point 2a passes through the respective knitting system 4, ensuring that the knitting tools 3 have already passed through the operating path. simple 36 to prevent premature tearing of the fibrous material 6. The rupture of the filament is then repaired or a new storage container 7 is made ready, the leading edge of the torn or new fibrous material 6 is inserted into the drawing device 9 or is also connected to the old fibrous material 6, then the drawing device 9 is switched on again and finally the mesh formation is continued as described. As when a failure 6a occurs, after a change of storage container 7 possibly carried out automatically, the formation of new meshes can also be delayed until any present split area has been sucked in by the suction tube 40 or until the sensor 42 indicates that the material fibrous is being supplied again by the drawing device 9.

Instead of the described programming of the sensor and / or evaluation unit 15/26, it is naturally also possible to have another sensor corresponding to sensor 42 next to sensor unit 15 which will only cause the generation of an error signal if no fibrous material is provided.

Petition 870180028901, of 10/04/2018, p. 40/55

The invention is not limited to the exemplary described modalities that can be modified in various ways. In particular, different means for transporting the knitting tools 3 beyond the fiber receiving point as shown in Figure 6 can be used. Other selector means, for example, controllable cam pieces, can be used instead of the electromagnet 37. If the transition from knitting to not knitting, and vice versa, occurs in the region of a shift point 2a formed by a plurality of knitting needles 3, this transition does not need to occur precisely on this specific knitting needle 3, so a specifically precise needle guide is not necessary. In addition, this can also be ensured by means other than those shown in the space between the hole in the filament guide 14 and a suction tube 40, 47 remains free to interfere with the knitting needles 3, even if these are guided in a intermediate position instead of within the simple operating path

36. For example, it would be possible to remove these knitting needles 3 to a low enough level just before passing the filament guide hole 14a. In addition, it is evident that fault tolerance limits 6a can be selected widely, as desired. For fibrous material 6 in the form of a roving tape 2.5 mm thick, for example, a tolerance range of + 0.03 mm to 0.07 mm proved to be expedient. In addition, means other than the described suction tube 40, 47 can be provided to ensure that the fibrous material 6 fed by the drawing devices 9 and possibly having faults 6a is directed outward on the simple operating path 36 after controlling the needles knit 3 before the knitting process is continued. In addition, when applying the suction pipe 40, 47, it is expedient, in order to save energy, to ensure that the suction pipes 40, 47 are connected to the outlet by means of appropriate valves, preferably

Petition 870180028901, of 10/04/2018, p. 41/55 electrically controllable, or the like, only when a fault 6a is detected. In addition, only a single suction tube is required, in principle, if it can be moved to any desired knitting system within the needle loop. It would be additionally conceivable to arrange the sensor unit 15 within a drawing device 9 provided that it is only ensured by considering the remaining draft that a detected fault 6a is carried as far as the respective knitting system 4 or as far as the thread. pass the pair of withdrawal cylinders III (or even the twist element 11 or the like) at most before the first non-knitting needle 3 of change point 2a has passed through the respective knitting system 4. In addition, arrangements other than those described can be used instead of sensor units 15,

42. For example, the application of capacitive measurement systems is particularly advantageous, in particular those that operate according to the three-electrode measurement principle, where the measurement signal is generated by the change in capacitance of at least one capacitor of precision. In addition, a different knitting tool holder can be provided instead of needle roller 2, for example a dial, and more than one change point can be provided. Particularly in the case of knitting tool holders of very large diameters, it would be possible, for example, to provide two diametrically opposite points of change and cut through the mesh products formed at both points of change. Finally, it is understood that different aspects can also be applied in different combinations from those described and represented.

Petition 870180028901, of 10/04/2018, p. 42/55

Claims (2)

1/7 -Q Ο G) 00 CO CO 00 CM CO CO Petition 870180028901, of 10/04/2018, p. 49/55 1. Method for producing a knitted product on a circular knitting machine (1) with a rotating needle cylinder (2) having knitting tools (3) and at least one knitting system (4), 5 meshes are formed by the knitting tools (3) being raised in a fiber receiving position (32) when passing through the knitting system (4) and then being removed again to receive a stretched fibrous material (6) fed by a drawing device (9), and where the fibrous material (6) is monitored in a location positioned in front of the 10 knitting system (4) in a fiber transport direction (v), characterized in that the monitoring is directed to the quality of the fibrous material (6), and that when a section (6A) of the fibrous material with a deviation does not allowance of a pre-selected quality is detected, the reception of this section of fibrous material (6a) by the knitting tools (3) is avoided, 15 in which the reception of the fibrous material section (6a) by the knitting tools (3) is avoided by interrupting the formation of meshes in the knitting system (4), in which the formation of meshes in the knitting system (4) is interrupted by the knitting tools (3) being directed beyond the fiber receiving location (33) without ejecting any of the stitches previously 20 trained. Method according to claim 1, characterized in that the monitoring is directed to non-permissible deviations from the mass or thickness of the fibrous material (6). Method according to claim 1 or 2, characterized in that the monitoring of the fibrous material (6) takes place at a location (15) at a distance from the knitting system (4), which is at least as large as the length of fibrous material (6) used per rotation of the knitting tool holder (3). Petition 870180028901, of 10/04/2018, p. 43/55 Method according to claim 3, characterized in that a turning point (2a) formed by adjacent knitting tools (3) is associated with the needle cylinder (2) and the interruption of the formation of the meshes is initiated with a knitting tool (3) at the change point 5 (2a) after an impermissible deviation in quality is detected. Method according to claim 1 or 2, characterized in that the reception of the fiber material section (6a) by the knitting tools (3) is avoided by turning off the drawing device (9). Method according to claim 1 or 2, characterized in that the reception of the section of fiber material (6a) by the knitting needles (3) is avoided by stopping the needle cylinder (2). Method according to one of claims 3 to 6, characterized in that the distance from the monitoring point (15) from the knitting system (4) is selected to be greater than the fibrous material 15 (6) used by rotating the needle cylinder (2) by at least one dimension corresponding to the distance of the drawing device (9) from the knitting system (4). Method according to one of claims 4 to 7, characterized in that after interrupting the mesh formation caused by 20 and section of fiber material (6a) a continuation of the meshing takes place with a knitting tool (3) of the change point (2a). Method according to one of claims 1 to 8, characterized in that when a circular knitting machine (1) with a plurality of knitting systems (4) is present, operation proceeds in 25 all knitting systems (4). 10. Circular knitting machine comprising: a rotating needle cylinder (2), knitting tools (3) arranged in it, at least one knitting system (4) arranged on the periphery of the Petition 870180028901, of 10/04/2018, p. 44/55 needle cylinder (2), a drawing device (9) associated with the knitting system (4) to feed a stretched fibrous material (6), means for raising the knitting tools (3) in a position of receiving fibers (32) as they pass through the knitting system (4) and then 5 remove them again to receive the fibrous material (6) fed by the drawing device (9), and a sensor unit (15) arranged in front of the knitting system (4) in a fiber transport direction (v) to monitor the fibrous material (6), characterized in that the sensor unit (15) is configured to monitor the quality of the fibrous material (6) and media 10 to issue an error signal if the quality deviates from a pre-selected tolerance range are provided, in which it has means of controlling the machine (38) so that the knitting in the knitting system (4) is interrupted after the emission of an error signal by the knitting tools (3) being directed beyond the receiving position of the fibers (33) without any 15 previously formed meshes being ejected. Circular knitting machine according to claim 10, characterized in that the sensor unit (15) is configured to monitor the mass or thickness of the fibrous material (6). 12. Circular knitting machine according to claim 20 10 or 11, characterized in that the sensor unit (15) is arranged at a distance from the knitting system (4), which is at least as wide as the length of the fibrous material (6) used per rotation of the needle cylinder (2). 13. Circular knitting machine according to claim 25 10, characterized in that a turning point (2a) formed by adjacent knitting tools (3) is associated with the needle cylinder (2) and the machine control means (38) is configured so that the interruption of the knitting is started with a knitting tool (3) from the point Petition 870180028901, of 10/04/2018, p. 45/55 change (2a) after an error signal has been issued. Circular knitting machine according to one of claims 10 to 13, characterized in that it has means (26) for disconnecting the drawing device (9) and / or for stopping the needle cylinder (2) after the 5 emitting an error signal. Circular knitting machine according to one of claims 10 to 14, characterized in that the sensor unit (15) is also configured to detect the presence of the fibrous material (6). Circular knitting machine according to one of 10 claims 12 to 15, characterized in that the distance of the sensor unit (15) from the knitting system (4) is greater than the fibrous material (6) used by rotation of the needle cylinder (2) by at least one dimension corresponding to the distance of the drawing device (9) from the knitting system (4). 15 17. Circular knitting machine according to one of claims 13 to 16, characterized in that the machine control means (38) is configured so that after an interruption of the meshing caused by an error signal a continuation of the forming Knitting takes place with a knitting tool (3) at the change point (2a). 18. Circular knitting machine according to one of claims 10 to 17, characterized in that it has a plurality of knitting systems (4) and drawing devices (9) associated with them, in which at least one unit of knitting sensor (15) is respectively associated with each knitting system (4). 19. Circular knitting machine according to claim 18, characterized in that the machine control means (38) is arranged so that the interruption of the formation of meshes on the associated knitting system (4) is initiated with a knitting tool from the change point Petition 870180028901, of 10/04/2018, p. 46/55 (2a) after the emission of an error signal from each of the sensor units (15). Circular knitting machine according to claim 18 or 19, characterized in that the drawing devices (9) of at least 5 two adjacent knitting systems (4) are joined together to form a group of drawing devices and the machine control means (38) is configured so that when an error signal is emitted by the sensor unit (15) of the knitting systems (4) adjacent, the entire group of drawing devices is switched off. 10 21. Circular knitting machine according to one of claims 10 to 20, characterized in that it contains at least one extractor means arranged behind the knitting tools (3). 22. Circular knitting machine according to claim 21, characterized in that the extractor means contains a suction tube (40), which 15 is movable back and forth between at least two knitting systems (4). 23. Circular knitting machine according to claim 21 or 22, characterized in that the suction tube (40) is arranged above the fiber receiving position (33) and a filament guide (14), which is vertically mobile forward and backward, it is associated with the 20 knit (4) associated. 24. Circular knitting machine according to claim 23, characterized in that the filament guide (14) has a motor connected to the machine control means (38) and the machine control means (38) is configured for displacement the filament guide (14) in the case of a 25 interruption caused by an error signal or a continuation of meshes after this interruption. 25. Circular knitting machine according to one of claims 10 to 24, characterized in that the sensor unit (15) is Petition 870180028901, of 10/04/2018, p. 47/55 configured as a capacitive sensor unit, which works in particular according to the three electrode measurement principle. Petition 870180028901, of 10/04/2018, p. 48/55 2/7 <ο ΙΟ ce co Ι ** · CM