Needle bar assembly and sewing machine

Abstract

The utility model relates to a needle bar assembly and a sewing machine, and the needle bar assembly comprises a connecting structure which is connected with a sewing machine main body; the machine needle is installed on the machine needle fixing structure, the machine needle fixing structure is movably matched with the connecting structure, and the machine needle fixing structure and the connecting structure are provided with circumferential limiting structures which are matched with each other; the transmission structure is matched with the machine needle fixing structure; and the output end of the driving structure is matched with the transmission structure. According to the technical scheme, the problem that time and labor are wasted when the needle position of a sewing machine is adjusted in the prior art is effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of sewing machines, and in particular, to a needle bar assembly and a sewing machine. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing material are interwoven or sewn together.

[0003] The sewing work of the sewing machine is mainly completed by the machine needle. In some prior arts, the machine needle is detachably mounted on the needle bar assembly, and different types of machine needles can be replaced according to different sewing objects. For different types of machine needles, the upper and lower heights need to be adjusted by removing the top screw, and the adjustment of the machine needle requires repeated debugging, so it is necessary to repeatedly disassemble and install the top screw to adjust the position of the machine needle. The above-mentioned machine needle adjustment is time-consuming and labor-intensive. Utility Model Content

[0004] The present application provides a needle bar assembly and a sewing machine to solve the problem that it is time-consuming and labor-intensive to adjust the needle position of the sewing machine in the prior art.

[0005] A needle bar assembly provided according to the present application includes: a connecting structure, which is connected to a sewing machine body; a needle fixing structure, on which the needle is mounted, the needle fixing structure is movably matched with the connecting structure, and the needle fixing structure and the connecting structure have a circumferential limiting structure that matches with each other; a transmission structure, which matches with the needle fixing structure; and a driving structure, the output end of the driving structure matches with the transmission structure.

[0006] Furthermore, the connecting structure includes a hollow rod, the transmission structure includes a threaded rod, the external thread of the threaded rod is adapted to the internal thread of the hollow rod, and the first end of the threaded rod is rotatably connected to the needle fixing structure.

[0007] Furthermore, the threaded rod includes a threaded section, a reduced diameter section and a limit plate, the first end of the threaded section is connected to the limit plate through the reduced diameter section, the needle fixing structure includes a fixed seat, the fixed seat has a limit plate accommodating portion and a connecting hole, the reduced diameter section passes through the connecting hole, and the limit plate is rotatably located in the limit plate accommodating portion.

[0008] Furthermore, the fixing seat includes a seat body and a pressure cover, the seat body and the pressure cover are detachably connected by fasteners, and the limiting plate accommodating portion and the communicating hole are both located between the seat body and the pressure cover.

[0009] Furthermore, the transmission structure also includes a driving gear and a driven gear, the driving gear is installed on the output shaft of the driving structure, the driving gear cooperates with the driven gear, the end of the threaded rod away from the machine needle has a driving hole, the center axis of the driven gear has a driving shaft section that cooperates with the driving hole, or the end of the threaded rod away from the machine needle has a driving shaft section, and the center axis of the driven gear has a driving hole that cooperates with the driving hole.

[0010] Furthermore, the axial length of the drive shaft segment is greater than the distance from the upper time point to the lower time point of the needle, and the axial length of the drive hole is greater than the distance from the upper time point to the lower time point of the needle.

[0011] Furthermore, the driving hole is non-circular, and the driving shaft section is non-circular to match the driving hole.

[0012] Furthermore, the transmission structure also includes a fixed support seat, which is installed on the sewing machine body, and the central axis of the driven gear is rotatably installed on the fixed support seat.

[0013] Furthermore, one side of the needle fixing structure close to the transmission structure is at least partially located in the connecting structure, and the portion of the needle fixing structure located in the connecting structure is non-circular and matched with the connecting structure to form a circumferential limiting structure; or the portion of the needle fixing structure located in the connecting structure has a protrusion, and the connecting structure has a groove matched with the protrusion to form a circumferential limiting structure; or the portion of the needle fixing structure located in the connecting structure has a groove, and the connecting structure has a protrusion matched with the protrusion to form a circumferential limiting structure.

[0014] According to another aspect of the present application, a sewing machine is also provided. The sewing machine includes a sewing machine body and a needle bar assembly, and the needle bar assembly is the needle bar assembly mentioned above.

[0015] By applying the technical solution of the present application, the driving structure is connected to the needle fixing structure through the transmission structure, and the needle fixing structure can be movably matched with the connecting structure, so that the driving structure can drive the needle fixing structure to move along the axial direction of the connecting structure, thereby adjusting the position of the needle. The needle fixing structure and the connecting structure have mutually matched circumferential limiting structures, so that the needle does not need to be adjusted in the circumferential direction relative to the rotary shuttle. With the above structure, the position of the needle can be adjusted by only driving the driving structure, so that the method of adjusting the needle is flexible, fast, time-saving and labor-saving. The technical solution of the present application effectively solves the problem of time-consuming and labor-intensive adjustment of the needle position in the sewing machine in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 A schematic diagram of the three-dimensional structure of the needle bar assembly of the first embodiment of the present application is shown;

[0019] Figure 2 Shows Figure 1 A schematic front view of a threaded rod of a needle rod assembly;

[0020] Figure 3 Shows Figure 1 A schematic plan view of the structure of the seat of the needle bar assembly;

[0021] Figure 4 Shows Figure 1 A schematic diagram of the three-dimensional structure of the gland of the needle bar assembly;

[0022] Figure 5 Shows Figure 1 A schematic diagram of the three-dimensional structure of the fixed support base of the needle bar assembly.

[0023] The above drawings include the following reference numerals:

[0024] 10. Connecting structure; 20. Needle fixing structure; 21. Fixed seat; 211. Seat body; 212. Pressure cover; 22. Limiting plate accommodating portion; 30. Transmission structure; 31. Threaded rod; 311. Threaded section; 312. Reduced diameter section; 313. Limiting plate; 314. Drive shaft section; 32. Driving gear; 33. Driven gear; 34. Fixed supporting seat; 40. Driving structure; 100. Needle; 200. Crankshaft structure. DETAILED DESCRIPTION

[0025] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0026] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0027] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0028] like Figures 1 to 5 As shown, the needle bar assembly of the first embodiment includes: a connecting structure 10, a needle fixing structure 20, a transmission structure 30 and a drive structure 40. The connecting structure is connected to the sewing machine body. The needle 100 is mounted on the needle fixing structure 20, and the needle fixing structure 20 is movably matched with the connecting structure 10, and the needle fixing structure 20 and the connecting structure 10 have a circumferential limiting structure that matches each other. The transmission structure 30 matches with the needle fixing structure 20. The output end of the drive structure 40 matches with the transmission structure 30.

[0029] By applying the technical solution of this embodiment, the drive structure 40 is connected to the needle fixing structure 20 through the transmission structure 30, and the needle fixing structure 20 is movably matched with the connecting structure 10, so that the drive structure 40 can drive the needle fixing structure 20 to move along the axial direction of the connecting structure 10, thereby adjusting the position of the needle 100. The needle fixing structure 20 and the connecting structure 10 have mutually matched circumferential limiting structures, so that the needle 100 does not need to be adjusted in the circumferential direction relative to the rotary shuttle. Through the above structure, the position of the needle 100 can be adjusted by only driving the drive structure 40, so that the method of adjusting the needle 100 is flexible, fast, time-saving and labor-saving. The technical solution of this embodiment effectively solves the problem of time-consuming and labor-intensive adjustment of the needle position of the sewing machine in the prior art.

[0030] like Figure 1 and Figure 2As shown, in the technical solution of the first embodiment, the connecting structure 10 includes a hollow rod, the transmission structure 30 includes a threaded rod 31, the external thread of the threaded rod 31 is adapted to the internal thread of the hollow rod, and the first end of the threaded rod 31 is rotatably connected to the needle fixing structure 20. The axial movement of the threaded rod 31 relative to the hollow rod can be achieved through the relative rotation between the internal thread of the hollow rod and the external thread of the threaded rod 31. It should be noted that since the hollow rod is constrained by the crankshaft structure 200, the hollow rod will not follow the threaded rod 31 to move circumferentially or axially. The axial movement of the needle 100 is relatively stable and has high precision through the threaded transmission. And the adjustment accuracy requirements of the needle 100 can be met according to the pitch of the thread. For example, the pitch can be set to 10 threads (0.1mm), 20 threads (0.2mm), 50 threads (0.5mm), etc. as needed.

[0031] like Figure 2 As shown, in the technical solution of the first embodiment, the threaded rod 31 includes a threaded section 311, a reduced diameter section 312 and a limit plate 313. The first end of the threaded section 311 is connected to the limit plate 313 through the reduced diameter section 312. The needle fixing structure 20 includes a fixed seat 21. The fixed seat 21 has a limit plate accommodating portion 22 and a connecting hole. The reduced diameter section 312 passes through the connecting hole. The limit plate 313 is rotatably located in the limit plate accommodating portion 22. The threaded rod 31 of this embodiment has a compact structure, is easy to disassemble and assemble, and has a good operating effect. The connecting hole is located at the upper part of the fixed seat 21 (the orientation here is Figure 1 orientation, which is easy to understand), connecting the limit plate accommodating portion 22 and the outside of the fixed seat 21, and the axis of the connecting hole is coaxially arranged with the axis of the fixed seat 21. The limit plate accommodating portion is circular, and the center of the circle is located on the axis of the fixed seat 21. The fixed seat 21 has an installation countersunk hole at one end away from the transmission structure 30, and the machine needle 100 is located in the installation countersunk hole. The diameter of the threaded section 311 is larger than the diameter of the limit plate 313, and the diameter of the limit plate 313 is larger than the diameter of the reduced diameter section, so that the threaded rod 31 is easy to cooperate with the fixed seat 21, install, limit and drive. The threaded rod 31 can rotate relative to the fixed seat 21. When the threaded rod 31 moves axially, it can drive the fixed seat 21 to move up and down, thereby realizing the up and down movement of the machine needle 100.

[0032] like Figure 3 and Figure 4As shown, in the technical solution of the first embodiment, the fixed seat 21 includes a seat body 211 and a gland 212, the seat body 211 and the gland 212 are detachably connected by fasteners, the limit plate accommodating portion 22 and the connecting hole are both located between the seat body 211 and the gland 212, and the gland 212 has a step on the side facing the seat body 211. The structure that the seat body 211 and the gland 212 are detachable by fasteners makes it convenient to disassemble and assemble the threaded rod 31 and the fixed seat 21. The gland 212 has a step on the side facing the seat body 211, so that the seat body 211 and the gland 212 are accurately matched, that is, the step has a positioning function. In addition, the lower surface of the limit plate accommodating portion 22 is a step surface, and the axial height of the limit plate accommodating portion 22 is the same as the axial height of the limit plate 313. Such a structure transmits a driving force that is more accurate and stable.

[0033] like Figure 1 As shown, in the technical solution of the first embodiment, the transmission structure 30 also includes a driving gear 32 and a driven gear 33. The driving gear 32 is installed on the output shaft of the driving structure. The driving gear 32 cooperates with the driven gear 33. The end of the threaded rod 31 away from the needle has a driving shaft section 314, and the central axis of the driven gear 33 has a driving hole that cooperates with the driving hole. The cooperation of the driving gear 32 and the driven gear 33, on the one hand, makes the transmission of the driving structure 40 relatively stable, and has the effect of buffering and shock absorption; on the other hand, a better speed ratio can be achieved by setting the modulus of the driving gear 32 and the driven gear 33.

[0034] It should be noted that the driving gear 32 and the driven gear 33 may be directly meshed or may be transmitted through an intermediate gear, and the transmission ratio may also be set according to actual needs.

[0035] like Figure 1 and Figure 2 As shown, in the technical solution of embodiment one, the axial length L of the drive shaft segment 314 is greater than the distance h from the upper time point to the lower time point of the needle, and the axial length H of the drive hole is greater than the distance h from the upper time point to the lower time point of the needle. In this way, when the crankshaft structure 200 drives the needle 100 to move, the drive structure 40 (a drive motor is used in this embodiment) will not move up and down with the needle 100, which greatly reduces the centrifugal force. It should be noted that L-h ≥ 1mm; H-h ≥ 1mm. In this embodiment, the difference range of L-h is between 1mm and 12mm, and 3mm can be taken. Similarly, the difference range of H-h is between 1mm and 12mm, and 3mm can be taken.

[0036] like Figure 1 and Figure 2As shown, in the technical solution of the first embodiment, the driving hole is non-circular, and the driving shaft section 314 is non-circular to match the driving hole. In this way, the driving hole and the driving shaft section 314 can achieve driving through their own structure, that is, the central axis of the driven gear 33 can drive the threaded rod 31, and no other auxiliary components are required. It should be noted that the above-mentioned non-circular shape includes elliptical, rectangular, spline shape and other regular and irregular shapes, as long as it can ensure that the central axis of the driven gear 33 drives the threaded rod 31 to rotate, and the driving shaft section 314 and the driving hole can move axially relative to each other.

[0037] like Figure 1 and 5 As shown, in the technical solution of the first embodiment, the transmission structure 30 also includes a fixed support seat 34, which is mounted on the sewing machine body, and the central axis of the driven gear 33 is rotatably installed on the fixed support seat 34. The setting of the fixed support seat 34 plays a role in limiting the driven gear 33, and the driven gear 33 can rotate relative to the fixed support seat 34. It should be noted that in this embodiment, the central axis of the driven gear 33 is matched with the fixed support seat 34 through an interference fit of the bearing, the fixed support seat 34 is interference fit with the outer ring of the bearing, and the central axis of the driven gear 33 on the side away from the needle 100 is interference fit with the inner ring of the bearing. The driving structure 40 includes a driving motor, which is mounted on the sewing machine body, and the driving motor is detachably mounted on the sewing machine body through fasteners.

[0038] like Figure 3 and Figure 4 As shown, in the technical solution of Example 1, the side of the needle fixing structure 20 close to the transmission structure 30 is at least partially located in the connecting structure 10, and the part of the needle fixing structure 20 located in the connecting structure 10 is non-circular and compatible with the connecting structure 10 to form a circumferential limiting structure. In this way, the circumferential limiting between the needle fixing structure 20 and the connecting structure 10 can be achieved through their own structure, and the axial movement between the needle fixing structure 20 and the connecting structure 10 can be achieved. That is, the hollow rod has an upper threaded hole section and a lower limiting hole section. As other embodiments, the part of the needle fixing structure 20 located in the connecting structure 10 can have a protrusion, and the connecting structure 10 can have a groove that matches the protrusion to form a circumferential limiting structure. Or the part of the needle fixing structure 20 located in the connecting structure 10 can have a groove, and the connecting structure 10 can have a protrusion that matches the protrusion to form a circumferential limiting structure.

[0039] The difference between the technical solution of the second embodiment and the technical solution of the first embodiment is that the height of the limit plate receiving portion in the axial direction is greater than the axial height of the limit plate 313, and plane bearings are installed on the upper and lower parts of the limit plate 313. The limit plate 313 is circular, and the limit plate receiving portion is also circular, and the diameter of the limit plate receiving portion is greater than the diameter of the limit plate 313. This greatly reduces the friction and wear between the limit plate 313 and the fixed seat 21, and reduces the processing accuracy and installation accuracy of the matching parts between the threaded rod 31 and the fixed seat 21.

[0040] The difference between the technical solution of the third embodiment and the technical solution of the first embodiment is that the end of the threaded rod 31 away from the needle has a driving hole, and the central axis of the driven gear 33 has a driving shaft section that matches the driving hole. Such a structure improves the versatility of the threaded rod 31 and the driven gear 33, that is, the positions of the driving hole and the driving shaft section can be selected according to the actual processing difficulty.

[0041] The difference between the technical solution of Example 4 and the technical solution of Example 1 is that the driven gear 33 is fixedly connected to the threaded rod 31, and the matching length between the driven gear 33 and the driving gear 32 is greater than or equal to the distance between the upper point and the lower point of the needle. The axial movement of the needle 100 can also be achieved. At this time, the axial movement of the needle 100 needs to drive the driven gear 33 to move together.

[0042] The difference between the protection scheme of the fifth embodiment and the technical scheme of the first embodiment is that the driving motor is located at the end of the threaded rod 31 away from the machine needle 100, rather than at the side of the threaded rod 31, so there is no need to set the driving gear 32 and the driven gear 33. It should be noted that the matching length between the output end of such a driving motor and the threaded rod 31 should also be greater than the distance from the upper time point of the machine needle 100 to the lower time point of the machine needle 100.

[0043] The present application also provides a sewing machine, which includes a sewing machine body and a needle bar assembly, wherein the needle bar assembly is the above-mentioned needle bar assembly. The sewing machine of the present application has high adjustment efficiency, high adjustment accuracy, high adjustment automation, and saves manpower and material resources when adjusting the position of the machine needle 100.

[0044] The sewing machine of the present application also includes a control component, the sewing machine body includes a fuselage and a crankshaft structure 200, the crankshaft structure 200 is mounted on the fuselage, the control component is arranged on the fuselage, the drive structure 40 of the needle bar assembly is connected to the fuselage, the connection structure 10 of the needle bar assembly is detachably connected to the crankshaft structure 200, and the drive structure 40 is electrically connected to the control component. The setting of the control component makes the sewing machine of the present application more automated. It should be noted that a position collector is arranged on the drive motor of the present application, and the number of revolutions of the drive motor can be collected by the position collector, and then converted into the axial movement distance of the needle 100 through the information pre-entered in the control component, and displayed on the display screen on the fuselage. There are many control methods for the movement of the needle 100. The first method is to move the needle 100 by entering information in the control component, for example, inputting a downward movement of 1mm, and the drive motor drives the needle 100 to move downward by 1mm. The second method is to set the control component to move a fixed distance, for example: short press the upward arrow once, the needle 100 moves upward 0.2mm, long press the upward arrow once, the needle 100 moves upward 0.5mm; short press the downward arrow once, the needle 100 moves downward 0.2mm, long press the downward arrow once, the needle 100 moves downward 0.5mm. In the present application, the drive motor is detachably connected to the machine body by screws, and the crankshaft structure 200 is detachably connected to the outer wall of the connecting structure 10 by screws. The sewing machines of the present application include sewing machines, stitching machines, embroidery machines, quilting machines, etc.

[0045] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0046] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0047] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A needle bar assembly, characterized in that: include: A connecting structure (10), the connecting structure being connected to a sewing machine body; A machine needle fixing structure (20), the machine needle (100) being mounted on the machine needle fixing structure (20), the machine needle fixing structure (20) being movably matched with the connecting structure (10), and the machine needle fixing structure (20) and the connecting structure (10) having mutually matched circumferential limiting structures; A transmission structure (30), the transmission structure (30) cooperates with the needle fixing structure (20); A driving structure (40), wherein an output end of the driving structure (40) cooperates with the transmission structure (30).

2. The needle bar assembly according to claim 1, characterized in that: The connecting structure (10) includes a hollow rod, and the transmission structure (30) includes a threaded rod (31). The external thread of the threaded rod (31) is adapted to the internal thread of the hollow rod, and the first end of the threaded rod (31) is rotatably connected to the needle fixing structure (20).

3. The needle bar assembly according to claim 2, characterized in that: The threaded rod (31) includes a threaded section (311), a reduced diameter section (312) and a limit plate (313), wherein the first end of the threaded section (311) is connected to the limit plate (313) via the reduced diameter section (312), and the needle fixing structure (20) includes a fixing seat (21), wherein the fixing seat (21) has a limit plate accommodating portion and a connecting hole, wherein the reduced diameter section (312) passes through the connecting hole, and the limit plate (313) is rotatably located in the limit plate accommodating portion.

4. The needle bar assembly according to claim 3, characterized in that: The fixing seat (21) comprises a seat body (211) and a pressure cover (212); the seat body (211) and the pressure cover (212) are detachably connected via fasteners; the limiting plate accommodating portion (22) and the communicating hole are both located between the seat body (211) and the pressure cover (212).

5. The needle bar assembly according to claim 2, characterized in that: The transmission structure (30) further comprises a driving gear (32) and a driven gear (33), wherein the driving gear (32) is mounted on the output shaft of the driving structure, the driving gear (32) cooperates with the driven gear (33), the end of the threaded rod (31) away from the needle (100) has a driving hole, and the central axis of the driven gear (33) has a driving shaft section that cooperates with the driving hole, or The end of the threaded rod (31) away from the machine needle has a driving shaft section (314), and the central axis of the driven gear (33) has a driving hole that matches the driving hole.

6. The needle bar assembly according to claim 5, characterized in that: The axial length of the drive shaft segment (314) is greater than the distance from the upper time point of the machine needle (100) to the lower time point of the machine needle (100), and the axial length of the drive hole is greater than the distance from the upper time point of the machine needle (100) to the lower time point of the machine needle (100).

7. The needle bar assembly according to claim 5, characterized in that: The driving hole is non-circular, and the driving shaft section (314) is non-circular to match the driving hole.

8. The needle bar assembly according to claim 5, characterized in that: The transmission structure (30) further comprises a fixed support seat (34), wherein the fixed support seat (34) is mounted on the sewing machine body, and the central axis of the driven gear (33) is rotatably disposed on the fixed support seat (34).

9. The needle bar assembly according to any one of claims 1 to 8, characterized in that: A side of the needle fixing structure (20) close to the transmission structure (30) is at least partially located within the connecting structure (10). The portion of the needle fixing structure (20) located inside the connecting structure (10) is non-circular and matches the connecting structure (10) to form the circumferential limiting structure; or The part of the needle fixing structure (20) located inside the connecting structure (10) has a protrusion, and the connecting structure (10) has a groove matched with the protrusion to form the circumferential limiting structure; or The portion of the needle fixing structure (20) located within the connecting structure (10) has a groove, and the connecting structure (10) has a protrusion that matches the protrusion to form the circumferential limiting structure.

10. A sewing machine, characterized in that: The sewing machine comprises a sewing machine body and a needle bar assembly, and the needle bar assembly is the needle bar assembly according to any one of claims 1 to 9.

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