CH707972B1 - Sewing device and sewing method. - Google Patents

Abstract

The sewing apparatus comprises a coordinating unit for coordinately controlling the pivotal movements of the needle bar in the transverse direction x and the movement of the sewing material in the sewing direction y and in the transverse direction x. Together with a presser foot (31) comprising a web (33) oriented in the sewing direction y, the coordinated movement of needle bar pivoting movement and sewing material movement can be used to create loops and / or cut such loops.

Description

Description: The invention relates to a sewing device and a sewing method according to the preamble of claims 1 and 7.

In household sewing machines arranged in the machine head needle bar performs during sewing cyclic up-down movements. In addition, the needle bar for performing zigzag stitches can be swiveled back and forth transversely to the transport direction of the flat sewing material. The fabric is moved forward and / or back in the sewing direction in synchronism with the needle bar up-down movements. The transport of the material can be done in a known manner by a conveyor, which is arranged in the throat plate below the needle bar. The movements of the needle bar and the feed dog are synchronously controlled by the machine control, wherein the feeding of the sewing material always takes place when the sewing needle is pulled out of the sewing material after the formation of a sewing stitch. When viewed in the direction of the material feed, behind the needle bar, a presser foot is exchangeably attached to a sewing foot bar of the sewing machine. Presser feet can be designed differently depending on the function to be performed. In particular, presser feet may comprise a sole which presses the material during the feed elastically resiliently against the feed dog. The coordinated movements of the needle bar and the feed dog are controlled by the machine control of the sewing machine. The feed length or stitch length and with zigzag stitches also the stitch width can be specified for the machine control. When sewing zigzag stitches, the needle bar is alternately swung back and forth by the amount of the current stitch width after each stitch across the sewing direction. With suitably designed sewing machines, parameters such as stitch length and stitch width can also be determined by the machine control on the basis of stored default values and / or algorithms and optionally changed during sewing. In addition to simple straight stitches and zigzag stitches, many household sewing machines also master other useful stitches, ornamental or decorative stitches. In this process, more complex patterns are formed in a sequence of multiple stitches. For the arrangement of the individual stitches, the sewing material can be pushed back and forth in sewing direction. The adjustment of the position transverse to the sewing direction takes place at the individual stitches by lateral pivoting of the needle bar.

From CH 437 986 a zigzag sewing machine with a device for stitch hits is known. On the sole of the presser foot, a narrow web is attached, the upper edge of which has a slight inclination in the material feed direction. The ridge projects into a slot on the foot of the squeegee, this slit dividing the back of the suture foot into two mirror-symmetric legs adjacent the stitch hole. When sewing, the fabric is advanced gradually through the feed dog. The insertion points of the sewing needle predetermined by the stitch width of the zigzag stitch lie alternately on both sides of the web. The needle with the upper thread is pivoted between successive stitches on the web, so that between each two adjacent puncture sites in the fabric loops are formed. In the puncture sites of the upper thread is knotted in a known manner with the lower thread. When forming loops, the upper thread is not passed over the thread tensioning device. When sewing, the fabric and thus also the already formed loops are pushed backwards. When reaching the web end, the loops remain loose on the surface of the fabric. Because of the loose knotting, the size of the loops can already be changed by low tensile forces. In addition, the two puncture sites of each loop are relatively far apart, since the needle in both pivotal positions of the needle bar must be able to pass the bridge at a safe distance without touching it.

Furthermore, it is known in embroidery machines or sewing machines with means for embroidering to clamp the fabric in an embroidery hoop and to move this hoop in two independent directions of an orthogonal to the needle bar axis stitching plane. A possibly existing transporter is put into an inactive state. The machine control controls the movements of the hoop in synchronism with the needle bar up-and-down movements. According to the position information of the stitching points for the sewing needle stored in an embroidery pattern file, the embroidery frame moves the sewing material into the corresponding desired position for each sewing stitch to be executed. There, a stitch cycle or a complete off-on movement of the needle bar is then carried out. When embroidering, only straight stitches are executed. In this case, a throat plate is used with a small stitch hole. The needle bar axis is orthogonal to the top of the needle plate and is not changed by the zigzag drive during embroidering.

An object of the present invention is to provide a sewing apparatus and a sewing method in which in addition to the movement of the fabric in the sewing plane and the pivotal movement of the needle bar can be used.

This object is achieved by a sewing apparatus and by a sewing method according to the features of claims 1 and 7.

Further advantageous embodiments of the invention are specified in the dependent claims. These include, in particular, a method and a device for forming loops or pile threads which protrude from a flat sewing material and whose connecting points with the sewing material have a comparatively small mutual distance.

A fundamental idea of the invention is to use the pivoting movement of the needle bar when attaching pile threads to a flat fabric to perform stitches on two sides of a finger-like web, and the fabric additionally with a Nähgutantrieb in the sewing plane in the pivoting direction of the needle bar to move. If the sewing needle for forming a loop is pivoted from one side of a web arranged between the needle bar and the fabric support web on the other side, can be reduced by the additional material movement of the distance between the successive puncture sites in the fabric.

Based on some figures, the invention will be described in more detail below. Show

1 is a sewing machine with attached embroidery device in front view,

2 is a plan view of a sewing machine with embroidery module,

3 shows three examples of the arrangement of puncture sites relative to the positions of an embroidery pattern file,

4 is a presser foot with a finger-like web in side view,

5 is a first situation representation,

6 is a second situation diagram,

7 is a third situation diagram,

8 is a fourth situation diagram in the production of a loop,

9 is a detailed view of a beaten over the web loop of the upper thread with a small distance of the injection sites,

10 is a detailed view of a beaten over the web loop of the upper thread with stitch spacing of the puncture sites,

11 is a first situation representation when creating a pile,

Fig. 12 is a second situation diagram when creating a Flors.

Fig. 1 shows a sewing machine 1 with a coupled embroidery module 3 as a sewing device in front view. Fig. 2 shows a plan view of such an arrangement. The embroidery module 3 is preferably detachably connected to the sewing machine 1 again by means of latching connecting elements, the upper side formed as an embroidery surface 5 being flush with the upper side of the lower arm 7 of the sewing machine 1. The embroidery module 3 comprises an embroidery arm 9 which can be displaced transversely to the sewing direction y or in the transverse direction x and which can be driven by a transverse drive (not shown). On embroidery arm 9, a carriage 11 or carriage is slidably mounted in the sewing direction y, said carriage 11 (not shown) by a longitudinal drive can be driven. On the carriage 11 coupling elements 13 are formed for releasably securing an embroidery frame 15. The embroidery module 3 or its drives or its drive control is connected to the machine control 17 of the sewing machine 1. At the bottom of the machine head 19 of the sewing machine 1, a needle bar 21 protrudes. At the lower end of this needle bar 21 coaxial with the needle bar axis A a sewing needle 23 is releasably held in a needle holder 25. The needle bar 21 is movable up and down in the direction of the needle bar axis A for performing sewing stitches, and is driven by the main drive (not shown) of the sewing machine 1. In addition, the needle bar 21 is mounted pivotably on the machine head 19 in the transverse direction x or transverse to the sewing direction y. Below the needle bar 21, an exchangeable throat plate (not shown) with a puncture opening (not shown) for the sewing needle 23 is arranged on the upper side of the lower arm 7. When sewing, stitch cycles are repeated. In this case, the sewing needle 23 is inserted through the sewing material 27 and through the puncture opening of the throat plate in a gripper region of the forearm 7. The upper thread 24 (FIGS. 6 and 7) pulled through the eye of the needle 23a is connected to the lower thread (not shown) below the throat plate. Subsequently, the sewing needle 23 is again pulled out of the sewing material 27 in the direction of the machine head 19. The position of the knots relative to the sewing material 27 is dependent on the thread tensions of the upper thread 24 and the lower thread. It is known to set, control or regulate the thread tension of the upper thread 24 and / or the lower thread in sewing machines 1 by suitable means.

Since the embroidery frame 15 is rigidly connected to the carriage 11 of the embroidery module 3 in the region of the coupling elements 13, the puncture site PN of the sewing needle 23 is in the embroidered frame 15 in the embroidery frame 27 relatively to a common reference position PR of the embroidery frame 15 and of the carriage 11 is uniquely determined by the position of the carriage 11 or by the position coordinates of the reference position PR in the transverse direction x and in the sewing direction y relative to a reference point P0 of the embroidery module 3. For stitching conventionally throat plates are used with small, round puncture openings and measures taken to prevent pivoting movements of the needle bar 21. The movements of the embroidery frame 15 are controlled by the machine controller 17 in synchronism with the movements of the needle bar 21. Based on stored motif data representing the puncture sites Pn and their sequence, embroidery patterns can conventionally be created with straight stitches in an unambiguous manner. Since, according to the present invention, both the fabric 27 can be displaced in the transverse direction x and the needle bar 21 can be pivoted in the transverse direction X, the throat plate must comprise a transversely aligned x elongated puncture opening, as is commonly used for zigzag sewing. Since the puncturing points PN are no longer uniquely determined by the stitch pattern data or by the position coordinates of the reference position PR, the machine control 17 comprises a coordination unit 29 (FIG. 1) which controls the movements of the embroidery frame 3 or the drive means for moving the sewing material 27 and the pivoting movements of the needle bar 21 in the transverse direction x coordinated with each other such that the puncture points PN of the sewing needle 23 are clearly defined in the fabric 27 according to predetermined or predetermined criteria. The co-ordinating unit 29 is preferably a part of the machine controller 17 having prescriptions defining the processing of embroidery pattern data together with data for controlling the pivotal movement of the needle bar 23. On the output side, the coordination unit 29 supplies control variables for controlling the drive means of the embroidery module 3 and the pivoting movement of the needle bar 21.

Preferably, the processing instructions and / or one or more parameters, which are required for the coordinated control of the drives of the embroidery module 3 and the needle bar 21, stored changeable in a memory of the coordination unit 29 or the machine control 17. For different operations to be performed, parameters or processing instructions may be appropriately selected, adjusted or changed. For clarification, some possibilities are listed below: a) The actual puncture sites PN correspond to the positions stored in the embroidery pattern file independently of the pivotal position of the needle bar axis A. The conditional by the pivotal position of the needle bar axis A offset Δχν in the transverse direction x is compensated by the fact that the coordination unit 29 corrects the position of the reference position Pr by a same large offset AxR. The pivoting position of the needle bar axis A can optionally be constant or changed according to other predetermined or predefinable criteria. These criteria may be stored as parameters or functions or processing instructions in the machine control 17 or the coordination unit 29. In particular, the pivotal position of the needle bar axis A can be alternately changed between two positions analogous to zigzag stitches after each stitch. More generally, a change of position can also occur after every n stitches, where n is a natural number. Instead of a periodic change between two pivoting placements, the respective pivoting position can be adjusted for each stitch in any manner, e.g. be specified by a function. In the embodiments described above, the pivotal position of the needle bar axis is set independently of the embroidery pattern data for each stitch to be formed. The coordination unit 29 may alternatively comprise provisions which calculate the pivotal position of the needle bar 21 as a function of the embroidery data. When calculating the pivot position for a sewing stitch to be formed, not only the information of the corresponding point from the design file can be taken into account, but the corresponding information of several points or point sequences. In particular, the coordination unit 29 may be e.g. include stored criteria for optimizing embroidery. Such a criterion may, for example, be the minimization of accelerations or changes in position of the embroidery frame 15 during embroidering. Correspondingly, the coordination unit 29 may comprise processing instructions which continuously determine optimal combinations of pivoting positions of the needle bar 21 and the reference points PR in the transverse direction x on the basis of the stitch data of the following stitches to be formed such that the movements or position changes of the embroidery frame 15 in the transverse direction x are minimal ,

B) The actual puncture points PN may differ from the positions indicated in the design file. The co-ordinating unit 29 processes the embroidery pattern data and settings for the pivotal position of the needle bar 21 as input variables to control quantities for positioning the embroidery frame 15 and the pivotal position of the needle bar 21 for the sewing stitches to be formed. In particular, the coordination unit 29 may be designed to cause the execution of two or more stitches for individual, several or all of the positions stored in the design file whose actual puncture sites PN are predetermined relative to the associated setpoint positions Ps from the motif file. FIG. 3 shows by way of example three stitch sequences. The actual puncture sites PN represented by black dots are offset from the corresponding target positions Ps represented by white dots. The individual offset of each of the puncture sites PN may comprise a component in the sewing direction y and / or a component in the transverse direction x. For each of the puncture sites PN, the coordination unit 29 controls the drives for the alignment of the needle bar 21 and / or for the positioning of the embroidery frame 15 in a suitable manner and triggers a stitch cycle. At the beginning and at the end of a sequence of sewing stitches or in other places, additional fastening stitches may be formed, as shown symbolically in FIG. 3 by the broken semicircular lines. This is particularly useful when the upper thread 24 and / or the lower thread between adjacent puncture sites PN loosely forms loops.

Fig. 4 shows a presser foot 31 with a finger-like narrow web 33, which can be used for the manufacture or attachment of such loops or pile threads on the surface of the sewing material 27. The presser foot 31 is fastened analogously to conventional presser feet on the presser foot bar (not shown) of the sewing machine 1. The web 33 is preferably in the sewing direction y forward over the needle bar axis A protruding portion of a formed sheet. The height H1 of the web 33 is less than or equal to the height of the loops to be formed. Preferably, the distance of the web 33 can be changed to the fabric 27, wherein the height position of the sheet metal part with the web 33 on the presser foot 31, for. by means of a thumbwheel 35 or alternatively by means of a servomotor (not shown) is changed. As a result, the distance H2 of the upper edge of the web 33 to the sewing material 27 between a minimum value, which is predetermined by the height of the web 33, and a larger value can be changed. This distance H2 of the upper edge of the web 33 determines the height of the loops to be formed. The web 33 is arranged so that the sewing needle 23 in different pivotal positions of the needle bar 21 for performing sewing stitches on both sides of the web 33 can be guided. Preferably, the needle bar axis A intersects the web 33 in its central pivot position, which is used to execute straight stitches. To form a loop of the upper thread 24, a first stitch cycle is carried out in a first pivot position of the needle bar 21 on one side of the web 33. Thereafter, the needle bar 21 is moved to a second pivot position and executed a further stitch cycle on the other side of the web 33. The upper thread 24 is stretched over the web 33 and forms a loop. In this way, several loops can be successively formed. One or more stitches are made alternately on each of the two sides of the web 33. Between the individual stitch cycles, the sewing material 27 can be moved forwards or backwards in the sewing direction y by an amount predetermined in each case by the control. The stitch sequences shown in Fig. 3 can be used in conjunction with the presser foot 31 of Fig. 4 for forming loops. In the stitch sequence shown on the left, in each case two stitch cycles are carried out with an intermediate pivoting movement of the needle bar 21 for forming a loop, without moving the sewing material 27 in the sewing direction y. These puncture points PN have in the transverse direction x a distance Β-ι, which is identical to the stitch width B2, which is predetermined solely by the pivot angle of the needle bar 21. This is followed by a sewing material movement in the sewing direction y by the amount of a stitch length Li. In this position of the sewing material 27, two stitch cycles are again carried out with pivoting movement of the needle bar 21 executed therebetween. The execution of two or more consecutive stitch cycles on the same side of the web 33 serves to secure the individual loops. In the middle stitch sequence in Fig. 3 takes place between the two stitch cycles, which form the loop, in addition alternately a forward or backward movement of the fabric 27 by an amount AL-i in the sewing direction y. This has the consequence that the loop planes are rotated relative to a normal plane to the sewing direction y by an angle β, which is preferably in the range of -45 ° to + 45 °. In the stitch sequence shown on the right in FIG. 3, not all loop levels have the same orientation. On the right side of the web 33, only one stitch cycle is executed at a time, so that two loops are formed directly in succession. The fixation of the loops by an additional stitch cycle takes place only on the left side of the web 33rd

In addition to the movement of the material 27 in the longitudinal direction y, the coordination unit 29 can also control movements of the material 27 in the transverse direction x and coordinate these with the pivoting movements of the needle bar 21. This can be used, in particular, to reduce the stitch width B-1 or the spacing of adjacent puncturing points PN from loops in the transverse direction x. FIGS. 5 to 8 show a sequence of situations that occur when creating such loops. 5 shows an arrangement in which the sewing needle 23 on the left of the web 33 is inserted into the sewing material 27. After the upper thread 24 has been connected or connected to the lower thread below the throat plate, the needle bar 21 is pulled up with the sewing needle 23 (FIG. 6). Subsequently, the needle bar 21 is pivoted to the right in the direction of the arrow P. Due to this pivoting movement alone, the distance B-1 of the puncture points PN in the transverse direction x would be equal to the stitch width B2 set on the sewing machine 1. By additionally moving the embroidery frame 15 with the sewing material 27 in the transverse direction x to the right, the distance is changed to the desired value Bi, as shown in FIGS. 7 and 8. Fig. 9 shows an enlarged view of the web 33 with a loop of the upper thread 24, wherein the two puncture PN have due to a coordinated movement of the needle bar 21 and the embroidery frame 15 in the transverse direction x only a small distance Bi to each other, in the order of the width of the web 33 lies. In comparison, Fig. 10 shows the web 33 with a loop of the upper thread 24, which was made only by the pivotal movement of the needle bar 21 in the transverse direction x. The distance B2 of the two puncture sites PN is significantly greater than the distance Bi.

The coordination unit 29 can drive the longitudinal drive and the transverse drive of the embroidery frame 15 coordinated with the zigzag drive for pivoting the needle bar 21. When the embroidery frame 15 is moved stepwise in the direction of sewing y forward or opposite to the sewing direction y, a series of several loops can be created in succession. If the distance traveled in the sewing direction y exceeds a length L2 given by the protrusion of the leading land end above the y-position of the needle bar axis A (Figure 4), the front loops slide over the front end of the land 33 and are then no longer guided by the bridge 33. If the embroidery frame 15 is moved stepwise in sewing direction y while creating loops, the loops at the rear end of the web 33 strike a cutting device arranged on the sewing foot 31. In the embodiment illustrated by way of example, the cutting device comprises a section of the sheet metal adjoining the web 33 at the rear, the obliquely upwardly projecting upper edge of which is designed as a cutting edge 37. Once the hoop 15 has been advanced by a distance L3 in sewing direction y, meet the first loops of the upper thread 24 on the cutting edge 37 and are separated by this when moving the embroidery frame 15 in two approximately equal length of pile threads which protrude upwards on the fabric 27 , The coordination unit 29 may include control rules for creating one or more rows with one or more pile threads in the form of closed and / or split loops or in any desired combinations. Preferably, one or more parameters e.g. can be preselected or adjusted via setting means on the sewing machine 1. Such parameters are e.g. the pile height or the height of the loops or the length of the pile threads determined by the adjustable distance H2 of the web 33 from the sewing material 27. The height H2 can be set constant for all pile threads. Alternatively, the height H2 may also be e.g. for each stitch or for groups of stitches individually, so that the resulting pile has a three-dimensional structure. In the coordination unit 29 additional information may be stored, which are assigned to one, several or all puncture sites PN. Such information can be, for example, actions that are to be executed when reaching a puncture site PN or when moving to the puncture site PN. In particular, it can be determined for each puncture site PN whether a puncture cycle should be performed at this puncture site PN or not. Changes in position of the embroidery frame 15 and / or the needle bar 21 without subsequent execution of a stitch cycle, for example, have the following functions: removing the loops from the web 33, cutting loops, which are placed over the web 33 or subtracting a certain amount of the upper thread 24. Die For example, one or more of the following information may include: default value for adjusting the flea position of the presser foot or web 33, details for uncoupling the needle bar 21 from the main drive, and / or for coupling any other tool (not shown) the Flauptantrieb, default value for the pivot position of the needle bar 21, speeds or speed gradients for the hoop drive, the Flauptantrieb and / or the drive for the pivoting movement of the needle bar 21 when approaching the respective puncture site Pn, default value for setting the Fa The voltage and / or the active conveying of the upper thread 24. Such information can be stored, for example, in a table-like manner with a clear reference to the respective puncture site PN in a storage medium accessible to the coordination unit 29.

When creating loops, the puncture PN next to each other at a small distance B-ι (Fig. 9), the upper thread 24 is in the movement of the fabric 27 in the transverse direction x laterally on the web 33 and is thus easily in the opposite direction Page pressed. When creating a filling pattern, the sequence of the individual puncture sites PN is defined so that the already created part of this filling pattern always lies only on one side of the ridge 33. This applies equally to the creation of conventional embroidery patterns, filling patterns with loops or pile threads or any combination thereof. Since the web 33 laterally pushes already created pile threads (FIGS. 11 and 12), the risk of depression and puncturing of these pile threads is minimized.

If the sewing machine 1 comprises means for controlling or controlling the thread tension and / or the feeding of the upper thread 24, the coordinating unit 29 may also be designed to control these means by e.g. for the various puncture sites PN corresponding setpoints for these funds. For example, when creating a sling, the upper thread tension can be reduced at short notice. With active promotion of the upper thread 24 between successive stitches loops can also be formed independently of a web 33, wherein the height of the pile threads or loops can be predetermined by the amount of thread feed.

With the sewing device according to the invention different functions can be performed, wherein the fabric 27 remain clamped unchanged in the hoop 15. In particular, areas with loops and / or cut pile threads can additionally be formed in embroidery work.

For sewing machines 1, which include a conveyor with longitudinal and transverse drive, this conveyor can be used as an alternative to the embroidery module 3 with the hoop 15 for moving the material 27. Also, the presser foot 31 with the web 33 may be formed in a different manner and e.g. a sole for holding down the sewing material 27 include (not shown).

Legend of the reference signs I Sewing machine 3 Embroidery module 5 Embroidery area 7 Lower arm 9 Embroidery arm II Carriage 13 Coupling elements 15 Embroidery frame 17 Machine control 19 Machine head 21 Needle bar 23 Sewing needle

Claims (12)

24 Needle thread 25 Needle holder 27 Sewing material 29 Coordination unit 31 Presser foot 33 Bridge 35 Adjusting wheel 37 Cutting edge A Needle bar axis Patent claims 1. sewing apparatus comprising a sewing machine (1) with a machine head (19) on which a needle bar (21) up and down movable and in a transverse direction x is mounted transversely to the sewing direction y pivotally, a device for moving the material (27) below the needle bar (21) in the sewing direction y and in the transverse direction x, and a machine controller (17) for controlling the movements of the needle bar (21) and the device for moving the sewing material (27), characterized in that the controller (17) is a coordinating unit (29), which is designed to provide control variables for the drives of the device for moving the sewing material (27) and for the drive for pivoting the needle bar (21) in the transverse direction x. 2. Sewing device according to claim 1, characterized in that the coordination unit (29) stored processing instructions for processing embroidery pattern data together with other data, which serve to control the pivoting movement of the needle bar (23), and stored in a memory of the coordination unit (29) are included, to control variables for the Nähgutbewegung and for the pivoting movement of the needle bar (21). 3. Sewing device according to claim 2, characterized in that the further data comprise at least one of the following information: a) the pivot positions for the needle bar (21) assigned to the nominal positions Ps represented by the stitch pattern data, b) indication whether the position of the sewing material (27 ) in accordance with the pivot position of the needle bar (21) is to be adjusted so that the puncture PN of the sewing needle (23) represented by the embroidery pattern data represented desired positions Ps, c) note whether the pivotal movement of the needle bar (21) to optimize the embroidery d) stitch patterns or reference to a stored stitch pattern with multiple puncture sites PN, which are predetermined relative to the desired positions Ps of the embroidery pattern file and instead of individual stitches at these desired positions Ps are executed, e) by the stitch pattern data represented desired positions Ps associated Specification of whether or not to execute a stitch cycle. F) Information on swivel positions or areas of the needle bar (21) in which no sewing cycles may be performed. G) Specification of a preset value for setting an elevation of a presser foot attached to the presser foot (31 ). 4. Sewing device according to one of claims 1 to 3, characterized in that on a presser foot of the machine head (19) a presser foot (31) is releasably secured again, said presser foot (31) comprises a web (33) extending in the sewing direction y extends beyond the position of the needle bar axis A, wherein the upper edge of this web (33) to the Nähgutebene has a distance H2. 5. Sewing device according to claim 4, characterized in that the web (33) is a portion of a formed sheet, and in that a to the web (33) adjacent portion of the sheet is formed as obliquely upwardly projecting cutting edge (37). 6. Sewing device according to one of claims 4 or 5, characterized in that the height position of the web (33) on the presser foot (31) and / or the height position of the presser foot bar are adjustable. A sewing method with a sewing apparatus according to any one of claims 1 to 6, wherein the cloth (27) is moved below the needle bar (21) in the sewing direction y and in the transverse direction x, and wherein the needle bar (21) performs stitch cycles in which one Sewing needle (21) held on the needle bar (21) is inserted into the fabric (27) and pulled out again, characterized in that the coordination unit (29) embroidery pattern data together with further data on control variables for the drives of the device for moving the material (27 ) in the sewing direction y and in the transverse direction x and for the drive for pivoting the needle bar (21) in the transverse direction x, such that the puncture points PN of the sewing needle (23) are clearly defined in the fabric (27) according to predetermined or specifiable criteria. A sewing method according to claim 7, wherein a presser foot (31) is mounted on a presser rod of the machine head (19) and comprises a web (33) extending in the sewing direction y beyond the position of the needle bar axis A, the upper edge thereof Web (33) to the fabric plane has a distance H2, characterized in that in a first pivot position of the needle bar (21) a first stitch cycle is performed, wherein the sewing needle (23) on the one side of the web (33) and pasted into the fabric (27) is inserted, that then the needle bar (21) pivoted in a second pivot position and the fabric (27) are moved in the transverse direction x that in this second pivot position, another stitch cycle is performed, the sewing needle (23) on the other Side of the web (33) guided past and into the fabric (27) is inserted, such that the upper thread between the adjacent puncture points PN on the web (33) is guided and a Noose forms. 9. sewing method according to claim 8, characterized in that a plurality of loops in the sewing direction y are arranged one behind the other, wherein the fabric (27) in each case after a maximum of two stitch cycles in the sewing direction y and / or moved back, and wherein at least on one side of the web (33) Reinforcement stitches are performed by running at least two stitch cycles in succession on that side of the web (33). 10. The method according to any one of claims 7 to 9, characterized in that the distance H2 of the upper edge of the web (33) is set to the Nähgutebene when creating loops as a constant value or changed according to a predetermined pattern. 11. The method according to any one of claims 7 to 10, characterized in that at least for each of the puncture points PN after moving the Nähguts (27) no stitch cycle is performed. 12. The method according to any one of claims 7 to 11, characterized in that when moving the material to be sutured (27) in the sewing direction y already formed loops are cut by the cutting edge (37).