CN117144581A - Sewing machine with rotatable needle bar - Google Patents

Abstract

The invention relates to a sewing machine with a rotatable needle bar, which comprises a machine shell, a needle bar, a puncture driving module and a rotary driving module, wherein the puncture driving module is in transmission connection with the needle bar, the rotary driving module comprises a first motor and a first tooth part, the first motor is arranged on the machine shell, the first tooth part is rotatably connected with the machine shell, the needle bar is provided with a second tooth part, the second tooth part comprises teeth matched with the first tooth part, the first motor is in transmission connection with the first tooth part, the first tooth part is meshed with the second tooth part, the length of teeth in the first tooth part is longer than that of teeth in the second tooth part, and the first tooth part and the second tooth part keep a meshed state in the lifting process of the needle bar; the sewing machine can effectively prevent the needle bar from contacting and rubbing with the rotary driving module in the action process, so that the abrasion of the needle bar can be avoided, the fatigue strength of the needle bar can be effectively improved, the load in the action process of the needle bar can be effectively reduced, and the stability and the service life of the needle bar can be effectively improved.

Description

Sewing machine with rotatable needle bar

Technical Field

The invention relates to the technical field of sewing machines, in particular to a sewing machine with a rotatable needle bar.

Background

Along with the continuous progress of the sewing technology and the continuous improvement of the sewing process requirements, the patterns which can be sewn by the existing sewing equipment are more and more, the numerical control degree of the sewing equipment is higher and more, convenience is brought to the sewing work, and the application range of the sewing equipment is wider and wider.

A sewing machine with a rotatable needle bar is a common sewing device, and generally includes a machine head, a needle bar, a needle disposed on the needle bar, a puncture driving module, a rotation driving module, and a rotating shuttle mechanism (or referred to as a rotating shuttle), wherein the puncture driving module and the rotation driving module are disposed in a casing of the machine head, and the needle bar is disposed at a position corresponding to the rotating shuttle mechanism (or referred to as the rotating shuttle), so that the needle can be matched with the rotating shuttle mechanism. The puncture driving module is in transmission connection with the needle bar so as to drive the needle bar to perform up-down puncture action, and meanwhile, the rotation driving module is also in transmission connection with the needle bar so as to drive the needle bar to rotate, so that the needle of the sewing machine can perform up-down puncture action and rotate so as to be matched with a rotating shuttle mechanism at the lower part better.

In the existing sewing machine with a rotatable needle bar, the needle bar can perform a puncturing action under the driving of the puncturing driving module and can rotate under the driving of the rotating driving module, so that the needle bar and the rotating driving module are always kept in a transmission connection state when the needle bar is required to perform the puncturing action, and meanwhile, the needle bar and the puncturing driving module are always kept in a transmission connection state when the needle bar is required to perform the rotating action, and therefore, the puncturing driving module, the rotating driving module and the needle bar are required to have special transmission connection structures. In the prior art, a plurality of special transmission connection structures are disclosed, although the needle bar has the functions of puncturing and rotating, the problems that the needle bar is easy to accelerate to wear and greatly reduce the service life of the needle bar are generally existed, for example, in the existing sewing machine with the rotatable needle bar, a puncturing driving module generally comprises a motor, a puncturing driving mechanism and a connector, as shown in Chinese patent CN 109554846A, the motor is in transmission connection with the connector through the puncturing driving mechanism, the needle bar is provided with a limiting retainer ring, as shown in the attached figure 1, the connector is limited and restrained in the limiting retainer ring, and the needle bar can rotate relative to the connector, so that the needle bar can be driven to lift by the puncturing driving module, and the needle bar has the rotating degree of freedom. In the prior art, the rotary driving module generally comprises a motor and a transmission sleeve, the transmission sleeve is sleeved on a needle bar, a groove (or a plane) or a spline is generally required to be arranged on the needle bar, the needle bar is in transmission connection with the transmission sleeve through the groove or the spline, although the needle bar can be driven to rotate by the transmission sleeve and can be vertically lifted relative to the transmission sleeve by the puncture driving module, the fatigue resistance of the needle bar can be reduced, for example, in the sewing machine disclosed in China patent CN 109554846A and China patent CN 110004608A, the rotary driving module is provided with a needle bar lower sleeve (namely the transmission sleeve), a screw, a cylinder clamping block, a turbine and a motor which are matched with the needle bar, and meanwhile, a clamping surface is processed on the needle bar in a mode of directly cutting out part of the outer circle of the needle bar, the needle bar lower sleeve is provided with a pin hole and a threaded hole communicated with the pin hole, the needle bar lower sleeve is sleeved on the needle bar, the pin hole corresponds to the clamping surface, the cylinder clamping block is arranged in the pin hole, one end surface of the cylinder clamping block is contacted with the clamping surface on the needle bar, and is in threaded connection with the threaded hole, and the cylinder clamping block is tightly clamped by the cylinder clamping block, so that the aim of fixing the cylinder clamping block is achieved; the motor is connected with the turbine transmission, and the turbine links to each other with needle bar lower cover, and in the operation in-process, the motor can drive needle bar lower cover rotatory, and needle bar lower cover passes through the contact of cylinder grip block and grip surface and drives the needle bar rotatory, and when the vertical puncture action of puncture drive module drive needle bar (i.e. the lift action), the needle bar is the action about the needle bar, though can realize the puncture and the rotation function of needle bar simultaneously, but adopts such transmission connection structure, in fact, first, need be at the side processing groove of needle bar (like the grip surface), can reduce the antifatigue strength of needle bar, especially current needle bar is very thin (only 7-8 mm) generally to be unfavorable for the structural strength and the life of needle bar very much. Secondly, in the process of lifting and puncturing the needle bar and rotating the needle bar, the needle bar can be contacted and rubbed with a transmission sleeve (such as a needle bar lower sleeve) and a cylindrical clamping block, the needle bar is usually in a high-speed motion state (usually 3000r/min and even higher), particularly when Mao Xiao and other impurities enter the contact surface of the needle bar and the transmission sleeve or the cylindrical clamping block, the needle bar can be rapidly worn, and the fatigue resistance of the needle bar is greatly reduced, so that the service life of the needle bar is reduced; in the second aspect, as friction is increased, the temperature at the friction position of the needle bar is increased sharply, so that the needle bar is heated unevenly, and the needle bar is easy to deform; in the third aspect, the noise in the needle bar action process is larger; in the fourth aspect, the external load born by the needle bar during the action is large, which is also unfavorable for the fatigue resistance of the needle bar. Due to the influence of the factors, the fatigue resistance of the needle bar is seriously reduced, the needle bar is unstable, the sewing precision is influenced, the service life of the needle bar is greatly reduced, and particularly for a high-speed sewing machine, the service life of the needle bar is usually not longer than 1 month. Although the prior art discloses a plurality of needle bar structures and needle bar transmission connection structures, the problems are not solved yet, and how to improve the fatigue resistance, stability and service life of the needle bar in a narrow assembly space of a sewing machine head is still needed to be solved.

Disclosure of Invention

The invention provides a novel sewing machine, which aims to solve the problems that in the existing needle bar rotatable sewing machine, the needle bar can contact and rub with a rotary driving module, so that the fatigue resistance of the needle bar is reduced, and the stability and the service life of the needle bar are obviously reduced, and the needle bar not only has puncture and rotation functions, but also can effectively prevent the needle bar from contacting and rubbing with the rotary driving module, and can effectively improve the fatigue resistance of the needle bar, and the main conception is that:

a sewing machine with rotatable needle bar comprises a shell, a needle bar, a puncture driving module and a rotary driving module, wherein the needle bar is provided with a limit check ring, the puncture driving module is connected with the needle bar in a transmission way and is used for driving the needle bar to perform puncture,

the rotary driving module comprises a first motor and a first tooth part, the first motor is arranged on the shell, the first tooth part is rotatably connected with the shell,

at least one limit retainer ring is provided with a second tooth part, the second tooth part comprises teeth matched with the first tooth part, each tooth is respectively arranged along the circumferential direction of the needle bar, the teeth are straight teeth,

the first motor is connected with the first tooth part in a transmission way and is used for driving the first tooth part to rotate, the first tooth part is meshed with the second tooth part and is used for driving the needle bar to rotate,

The length of the teeth in the first tooth part is longer than that of the teeth in the second tooth part, and the first tooth part and the second tooth part keep an engaged state in the process of puncturing the needle rod. In the scheme, the second tooth part is arranged on the limit retainer of the needle bar, so that the second tooth part can be connected with the needle bar into a whole, power is transmitted by the second tooth part, the second tooth part and the needle bar synchronously act, and an additional transmission part is not required to be arranged on the needle bar, so that a narrow assembly space in a machine head is adapted; the first tooth part is arranged in the rotary driving module, and the first tooth part is meshed with the second tooth part, so that rotary power is transmitted to the needle bar by utilizing the meshing of the first tooth part and the second tooth part, the problem of driving the needle bar to rotate by utilizing the first motor can be solved, in the rotating process, the needle bar is not in direct contact and friction with the rotary driving module, the abrasion of the needle bar can be avoided, the fatigue resistance of the needle bar can be effectively improved, the stress condition in the action process of the needle bar can be effectively improved, the load on the needle bar is reduced, and the stability and the service life of the needle bar are improved; through constructing the teeth of the first tooth part and the teeth of the second tooth part into straight teeth, the length direction of the straight teeth is parallel to the length direction of the needle bar, and meanwhile, the length of the teeth in the first tooth part is larger than the length of the teeth in the second tooth part, so that the first tooth part and the second tooth part can always keep the meshed state in the process of needle bar puncturing action.

In order to solve the problem of the puncture action of the driving needle bar, the puncture driving module further comprises a second motor, a puncture driving mechanism and a connector, wherein,

the connector is limited between the two limiting check rings, the needle bar can rotate relative to the connector,

the second motor is installed in the casing, and the second motor passes through puncture actuating mechanism and connector transmission to be connected for the length direction of drive connector along the needle bar removes. So as to drive the needle bar to perform the puncturing action, and simultaneously, the limiting retainer ring not only can realize limiting fit with the connector, but also can realize transmission fit with the first tooth part, so that the limiting retainer ring has multiple functions, thereby simplifying the structure and being more suitable for a narrow assembly space in the sewing machine head.

Preferably, the two limiting check rings are respectively provided with the second tooth parts, and the two limiting check rings are respectively meshed with the first tooth parts. In the scheme, because the two limiting check rings are arranged at intervals, the two second tooth parts are mutually spaced, and the two second tooth parts are combined to be respectively meshed with the first tooth part, so that on one hand, the meshing length can be effectively increased, and the transmission is more stable and more accurate; on the other hand, two second tooth portions and first tooth portion form two meshing, need not to increase the length of every second tooth portion and the thickness of spacing retaining ring can satisfy more steady transmission's demand to can satisfy the transmission demand in the narrow and small assembly space in the aircraft nose. In addition, in order to utilize two spacing retaining rings to drive the needle bar simultaneously and rotate, on the one hand, can be under the condition that does not change current puncture drive module, utilize spacing retaining ring to effectively solve in the sewing machine the needle bar can take place the friction with rotatory drive module, lead to the fatigue strength and the problem that life is showing to reduce of needle bar, on the other hand, need not increase remaining structure on the basis of current needle bar, simple structure to be applicable to narrow and small assembly space in the aircraft nose, and the commonality is better.

In order to solve the problem that the first tooth part and the second tooth part always keep the meshing state in the process of puncturing the needle rod, further, the length of the teeth in the first tooth part is L, the lengths of the teeth in the two limiting check rings are L1 and L2 respectively, the distance between the two limiting check rings is H, and the maximum puncturing travel of the needle rod is W, wherein L is equal to or greater than H+L1+L2+W. Therefore, the second tooth parts on the two limiting retainers are always in a complete meshing state with the first tooth parts in the range of the puncture stroke of the needle bar, so that the transmission is stable, the transmission precision is high, and the stability and the precision of the sewing are improved.

For solving the problem that the drive needle bar carries out the puncture action, further, puncture actuating mechanism includes transmission shaft, balancing piece, bent axle, connecting rod and guide structure, wherein, transmission shaft rotatable coupling is in the casing, the second motor is connected with the transmission shaft transmission for the drive transmission shaft rotates, and the balancing piece sets up in the transmission shaft, and the one end eccentric connection of bent axle is in the balancing piece, and the upper end rotatable coupling of connecting rod is in the bent axle, and the lower extreme rotatable coupling of connecting rod is in the connector, and the one end mobilizable constraint of connector is in guide structure, and guide structure is vertical to be set up in the casing for the connector is along needle bar length direction's removal direction. So that the second motor is used for driving the connector to move along the length direction of the needle bar, and the limiting retainer ring is used for driving the needle bar to synchronously move along the length direction of the needle bar, so that the puncture action of the needle bar is realized.

For solving the contactless transmission problem of first motor and needle bar, in some schemes, rotary drive module includes gear and transmission post, first tooth portion is for constructing in the tooth of gear, the tooth is straight tooth, and the gear is installed in the transmission post, and the rotatable setting in the casing of transmission post, transmission post and needle bar are parallel, and first motor is connected with the transmission post transmission. The first motor can drive the needle bar to rotate through the meshing of the gear and the limiting retainer ring, the whole rotary driving module is not in direct contact and friction with the needle bar, the problem of abrasion of the needle bar does not exist, and accordingly the anti-fatigue strength of the needle bar is improved.

For solving first motor and needle bar contactless transmission's problem, in other schemes, still include the transmission post, the transmission post adopts the step shaft structure, and the transmission post includes two at least axle sections, first tooth portion is for constructing in the tooth of one of them axle section, the tooth is straight tooth, the transmission post is parallel with the needle bar, first motor with the transmission post transmission is connected. In the scheme, the transmission column adopts a stepped shaft structure and comprises at least two shaft sections so as to process, position and assemble the transmission column; through directly constructing first tooth portion in one of them axle section for first tooth portion and transmission post structure as an organic whole not only be convenient for machine-shaping, can further improve transmission post's intensity and rigidity moreover, and can make whole transmission post littleer under the circumstances of guaranteeing transmission post structural strength, more satisfy the demand of assembling in the narrow and small assembly space in the aircraft nose. In addition, when the assembly, can realize the restraint and the location to first tooth portion through restraint and location transmission post, not only the assembly is more convenient, can simplify the inner structure of aircraft nose moreover, is favorable to reduce cost.

In order to solve the problem of being convenient for arrange the position of the first motor rationally, further, the rotary driving module still includes a drive mechanism, first motor pass through a drive mechanism with the transmission post transmission is connected. Through configuration first drive mechanism, can more nimble position of arranging first motor to can more reasonable utilization aircraft nose internal narrow and small assembly space.

Preferably, the first transmission mechanism comprises a coupling or a gear transmission mechanism or a belt transmission mechanism.

The second aspect of the invention is to solve the problem of adapting to a narrow assembly space in a sewing machine head, further, the other shaft section of the transmission column is also provided with a third tooth part, and the rotary driving module further comprises a first transmission mechanism, and the first transmission mechanism is in transmission connection with the third tooth part. In the scheme, the first tooth part and the third tooth part are integrated at the same time in the transmission column, so that the transmission column is convenient to integrally process and form, on one hand, the structural strength of the transmission column can be effectively ensured, the whole assembly in the machine head of the sewing machine is convenient, and independent positioning structures, constraint structures and the like are not required to be respectively configured for the first tooth part and the third tooth part, so that the requirement on the installation space can be reduced; on the other hand, the whole transmission column can be made smaller under the condition of ensuring the structural strength, and the transmission column is more suitable for a narrow installation space in a sewing machine head.

The third aspect of the invention aims to solve the problem of axial movement of the transmission column in the process of high-speed puncture of the needle rod, and further comprises a first limit structure for adapting to the transmission column and a second limit structure for adapting to the transmission column, wherein the first limit structure is used for limiting the transmission column to move along one axial direction, and the second limit structure is used for limiting the transmission column to move along the other axial direction. In this scheme, through configuration first limit structure, can restrict the transmission post and remove along one of them axial direction, and through configuration second limit structure, can restrict the transmission post and remove along another axial direction, through the cooperation of first limit structure and second limit structure, can spacing constraint transmission post to can prevent effectively that the needle bar high-speed puncture action from driving transmission post axial float.

Preferably, the first limiting structure and the second limiting structure are limiting blocks arranged at two ends of the transmission column respectively. So that the two ends of the transmission column are limited by the limiting blocks.

The fourth aspect of the present invention is to solve the problem of easy replacement of the needle bar, further, the limit retainer ring is configured with a central hole adapted to the needle bar and a connection hole, one end of the connection hole is communicated with the central hole, the other end penetrates through the outer side surface of the limit retainer ring, the connection hole is configured with an internal thread,

The needle rod is characterized by further comprising a fastener, wherein the fastener is provided with external threads matched with the internal threads, and the fastener is connected with the limiting retainer ring in a threaded manner and abuts against the needle rod. In this scheme, the fixed spacing retaining ring of mode that adopts the top tight not only is convenient for install, dismantle and adjust the position of spacing retaining ring to be convenient for the change and the assembly of needle bar, make the spacing retaining ring can more firm install in the needle bar moreover, show the joint strength who improves spacing retaining ring and needle bar, pass through the spacing retaining ring and pass through bigger moment of torsion to the needle bar, can satisfy the rotatory demand of utilizing spacing retaining ring drive needle bar.

Compared with the prior art, the sewing machine with the rotatable needle bar can effectively prevent the needle bar from contacting and rubbing with the rotary driving module in the action process, not only can avoid abrasion of the needle bar and deformation caused by uneven heating of the whole needle bar, thereby effectively improving the fatigue resistance of the needle bar, but also can effectively reduce the load in the action process of the needle bar, remarkably reduce the noise, and further effectively improve the stability and the service life of the needle bar, and is particularly suitable for high-speed sewing machines.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural view of a puncture driving module in a conventional sewing machine.

Fig. 2 is a schematic structural view of a puncture driving module in the sewing machine according to embodiment 1 of the present invention.

Fig. 3 is a cross-sectional view of the joint of fig. 2.

Fig. 4 is a schematic structural view of a rotary driving module in a sewing machine according to embodiment 1 of the present invention.

Fig. 5 is a cross-sectional view at A-A in fig. 4.

Fig. 6 is an enlarged partial schematic view of fig. 4.

Fig. 7 is a schematic structural view of a driving post in a sewing machine according to embodiment 2 of the present invention.

Fig. 8 is an end view of fig. 7.

Fig. 9 is a schematic structural view of a rotary driving module in a sewing machine according to embodiment 2 of the present invention.

Fig. 10 is a schematic structural view of a rotary driving module in a sewing machine according to embodiment 3 of the present invention.

Fig. 11 is a cross-sectional view of a stop collar in a sewing machine according to embodiment 4 of the present invention.

Description of the drawings

The rotary drive module 1, the first motor 11, the first transmission mechanism 12, the driving pulley 121, the driven pulley 122, the timing belt 123, the driving post 13, the first tooth portion 14, the teeth 15, the third tooth portion 16, and the optical axis 17

Puncture driving module 2, second motor 21, puncture driving mechanism 22, connector 23, sleeve 231, and second transmission mechanism 24

Drive shaft 31, counterweight 32, crankshaft 33, connecting rod 34, and guide structure 35

Needle bar 4, needle 41

Limit retainer ring 5, second tooth portion 51, central hole 52, connecting hole 53, internal thread 531

First limit structure 61 and second limit structure 62

Rotating shuttle mechanism 7

Bearing 8

And a fastener 9.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present invention.

Example 1

In this embodiment, there is provided a sewing machine with a rotatable needle bar, comprising a machine head, a needle bar 4, a puncture driving module 2, a rotation driving module 1 and a rotating shuttle mechanism 7, wherein,

As shown in fig. 2-4, the needle bar 4 may be vertically arranged on the casing of the handpiece so as to perform up-and-down puncturing actions along the vertical direction; simultaneously, puncture drive module 2 is connected with needle bar 4 transmission to utilize puncture drive module 2 to drive needle bar 4 to carry out the puncture action along vertical direction. In practice, the needle bar 4 is arranged above the rotating shuttle 7, the needle bar 4 is provided with a limit retainer 5, as shown in fig. 2 and 3, the limit retainer 5 can be matched with the puncture driving module 2, and in practice, the end of the needle bar 4 is also provided with an organic needle 41, as shown in fig. 2, so as to be matched with the rotating shuttle 7 below. In practice, the rotating shuttle mechanism 7 may employ an existing rotating shuttle mechanism 7 (or referred to as a rotating shuttle body) so as not to be illustrated herein. In the implementation, the limiting retainer ring 5 can be fixed on the needle rod 4 in a conventional fixing manner, which is not described herein.

In this embodiment, as shown in fig. 2 and 4, the rotary driving module 1 includes a first motor 11 and a first tooth portion 14, the first tooth portion 14 includes a plurality of teeth 15, the teeth 15 are straight teeth, the length direction of the straight teeth is parallel to the length direction of the needle bar 4, the first motor 11 is mounted on a housing, the first tooth portion 14 is rotatably connected to the housing of the machine head, and the first motor 11 is in transmission connection with the first tooth portion 14, so that the first tooth portion 14 is driven to rotate by the first motor 11.

In this embodiment, as shown in fig. 2 and 4, the needle bar 4 is provided with the second tooth portion 51, so that the second tooth portion 51 can be connected with the needle bar 4 into a whole, so that the needle bar 4 and the second tooth portion 51 can act synchronously. The second tooth portion 51 includes teeth 15 adapted to the first tooth portion 14, each of which is arranged in the circumferential direction of the needle bar 4, and is likewise straight, and the length direction of the straight teeth is parallel to the length direction of the needle bar 4. During assembly, the first tooth part 14 is meshed with the second tooth part 51, and the needle bar 4 can be driven to rotate through the first tooth part 14, so that the aim of driving the needle bar 4 to rotate by utilizing the first motor 11 is fulfilled; the second tooth portion 51 can also linearly move along the central axis direction of the needle rod 4 relative to the first tooth portion 14, and the first tooth portion 14 cannot block the second tooth portion 51 in the moving process.

In practice, the length of the teeth in the first tooth portion 14 is longer than the length of the teeth in the second tooth portion 51, as shown in fig. 4, so that the first tooth portion 14 and the second tooth portion 51 can always maintain the engaged state during the puncturing operation of the needle rod 4.

In order to drive the needle bar 4 to perform the puncturing action, in one embodiment, as shown in fig. 2, the puncturing driving module 2 includes a second motor 21, a puncturing driving mechanism 22 and a connector 23, wherein two spacing check rings 5 are disposed on the needle bar 4, as shown in fig. 2, the connector 23 is limited between the two spacing check rings 5, not only the needle bar 4 can rotate relative to the connector 23, but also the needle bar 4 can be driven to vertically lift by the connector 23. In practice, the second motor 21 is mounted on the housing, and the second motor 21 may be in transmission connection with the connector 23 through the puncture driving mechanism 22, so that the connector 23 is driven by the second motor 21 to move along the length direction (i.e., the axial direction, which will not be described in detail later) of the needle shaft 4. In order to realize rotatable connection between the connector 23 and the needle bar 4, as an example, as shown in fig. 2 and 3, one end of the connector 23 is configured with a sleeve 231 adapted to the needle bar 4, the inner diameter of the sleeve 231 is larger than the outer diameter of the needle bar 4, meanwhile, the length of the sleeve 231 is smaller than the distance between two limit stops, and the sleeve 231 is sleeved on the needle bar 4 between two limit stops 5, as shown in fig. 2 and 3, so that the needle bar 4 and the limit stops can rotate relative to the sleeve 231 of the connector 23. In addition, as another example, one end of the connector 23 may be configured to be adapted to a fork of the needle bar 4, and the fork is limited to two limit stops, so that the same effect can be achieved.

In practice, the puncture driving mechanism 22 may also have various embodiments, for example, in one embodiment, the puncture driving mechanism 22 includes a transmission shaft 31, a balance block 32, a crankshaft 33, a connecting rod 34, and a guiding structure 35, as shown in fig. 2, where the transmission shaft 31 may be rotatably connected to the casing through a bearing 8, the second motor 21 may be connected to the transmission shaft 31 through a coupling, a second transmission mechanism 24 such as a belt transmission mechanism or a gear transmission mechanism, for driving the transmission shaft 31 to rotate, the balance block 32 is disposed on the transmission shaft 31, one end of the crankshaft 33 is eccentrically connected to the balance block 32, the upper end of the connecting rod 34 is rotatably connected to the crankshaft 33, the lower end of the connecting rod 34 is rotatably connected to the connecting head 23, as shown in fig. 2, one end of the connecting head 23 is movably restrained to the guiding structure 35, the guiding structure 35 is parallel to the needle bar 4, and the guiding structure 35 may be a guiding groove or a guiding rail, so as to guide the puncture motion of the connecting head 23, thereby more precisely drive the connecting head 23 along the length direction of the needle bar 4 by using the second motor 21. In other embodiments, the puncture driving mechanism 22 may also be a cam mechanism, a crank-link mechanism 34, a linear module, or the like, so long as the connector 23 can be driven to move back and forth along the length direction of the needle shaft 4, which is not illustrated here.

In practice, the second tooth portion 51 has various embodiments, and as an example, the teeth in the second tooth portion 51 may be directly configured on the outer surface of the needle bar 4 and form a circle along the circumferential direction of the needle bar 4, but because the needle bar 4 is very thin, this embodiment greatly increases the processing difficulty of the needle bar 4 and significantly increases the cost. As another example, the second tooth portion 51 may be a gear, which is mounted on the needle bar 4, but this embodiment adds one or two gears to the head of the existing sewing machine, which not only increases the difficulty of assembling the needle bar 4, but also occupies more space in the head, so that the space in the head is smaller. In order to solve these problems, in the preferred embodiment provided in this embodiment, at least one of the limit retainers 5 is provided with a second tooth portion 51, that is, the second tooth portion 51 may be preferentially provided on the limit retainer 5, and by providing the second tooth portion 51 on the limit retainer 5 of the needle shaft 4, on one hand, the second tooth portion 51 may be connected with the needle shaft 4 into a whole, so that the second tooth portion 51 is used to transmit power, and the second tooth portion 51 and the needle shaft 4 are synchronously operated, so as to achieve the purpose of driving the needle shaft 4 to rotate; on the other hand, the limit retainer ring 5 not only can realize limit fit with the connector 23, but also can realize transmission fit with the first tooth part 14, so that the limit retainer ring 5 has multiple functions, thereby simplifying the structure, avoiding the need of configuring additional transmission parts on the needle bar 4, being more suitable for a narrow assembly space in the sewing machine head, and having obvious advantages which cannot be achieved by other embodiments.

In one embodiment, a second toothing 51 can be provided on one stop collar 5, with which stop collar 5 a drive connection with the first toothing 14 is possible. In another preferred embodiment, the two limit stops 5 are respectively provided with the second teeth 51, as shown in fig. 2-4, and the teeth on the two limit stops 5 are in one-to-one correspondence, so that the two limit stops 5 can respectively mesh with the same first teeth 14. Specifically, because the two limiting retainers 5 are arranged at intervals, the two second tooth parts 51 are mutually spaced, and the two second tooth parts 51 are combined to be respectively meshed with the first tooth part 14, so that on one hand, the meshing length can be effectively increased, and the transmission is more stable and more accurate; on the other hand, two second tooth parts 51 and the first tooth parts 14 form two meshing positions, the requirement of smoother transmission can be met without increasing the length of each second tooth part 51 and the thickness of the limiting retainer ring 5, and the transmission requirement in a narrow assembly space in a machine head can be met. In addition, in order to utilize two spacing retaining rings 5 to drive needle bar 4 simultaneously and rotate, on the one hand, can be under the condition that does not change current puncture drive module 2, utilize spacing retaining ring 5 to effectively solve in the sewing machine needle bar 4 can take place the friction with rotatory drive module 1, lead to the fatigue strength and the life of needle bar 4 to show the problem that reduces, on the other hand, need not increase remaining structure on the basis of current needle bar 4, simple structure to be applicable to the interior narrow and small assembly space of aircraft nose, and the commonality is better.

It can be appreciated that, in implementation, the second tooth portion 51 may be machined on the existing limit retainer 5, or an existing gear may be directly adopted as the limit retainer 5, so that the purpose of driving the needle rod 4 to rotate can be achieved. In this embodiment, the teeth in the second tooth portion 51 enclose a circle along the circumferential direction of the limit collar 5, as shown in fig. 4 and 5, so as to achieve rotation at any angle. Of course, in other embodiments, the teeth in the second tooth portion 51 may also be rounded in the circumferential direction of the retainer ring 5, so as to achieve a rotation of a specific angle.

In practice, the first tooth portion 14 has various embodiments, and the rotary driving module 1 further includes a gear, where the first tooth portion 14 may be a tooth 15 configured on the gear, and the tooth 15 is a straight tooth, the gear is rotatably disposed on the casing, a central axis of the gear is parallel to a central axis of the needle shaft 4, and the first motor 11 is connected with the gear in a transmission manner so as to drive the gear to rotate. In implementation, the gear may be mounted on a transmission column 13, as shown in fig. 4, the transmission column 13 may be connected to the casing through a bearing 8, and the first motor 11 is in transmission connection with the transmission column 13, so as to drive the transmission column 13 and the gear to rotate synchronously, thereby achieving the purpose of driving the needle rod 4 to rotate. In practice, the gear may preferably be a cylindrical gear, and the length of the teeth in the gear is greater than the length of the teeth in the second tooth portion 51, so as to meet the requirement that the first tooth portion 14 and the second tooth portion 51 remain engaged during the puncturing action of the needle rod 4. In this embodiment, the first motor 11 can drive the needle bar 4 to rotate through the engagement of the gear and the limit retainer ring 5, the whole rotary driving module 1 is not in direct contact and friction with the needle bar 4, the problem of wearing the needle bar 4 does not exist, and the fatigue resistance of the needle bar 4 can be remarkably improved. Of course, in practice, the driving post 13 may preferably be of a stepped shaft configuration for machining, positioning and assembly.

As another example, the rotary driving module 1 further includes a driving post 13, where the driving post 13 adopts a stepped shaft structure, and the driving post 13 includes at least two shaft segments, as shown in fig. 4-6, the first tooth portion 14 is a tooth configured on one of the shaft segments, the tooth is a straight tooth, and the driving post 13 may be rotatably disposed on the housing through a bearing 8, as shown in fig. 4, and the driving post 13 is parallel to the needle shaft 4, as shown in fig. 4, so that a center-to-center distance between the driving post 13 and the needle shaft 4 is kept constant along a length direction of the needle shaft 4, so that the needle shaft 4 moves relative to the driving post 13; the first motor 11 is in transmission connection with the transmission column 13, so that the transmission column 13 and the first tooth part 14 arranged on the transmission column 13 are driven to synchronously rotate by the first motor 11. In this embodiment, the transmission column 13 is in a stepped shaft structure, and the transmission column 13 comprises at least two shaft sections, so as to process, position and assemble the transmission column 13; through directly constructing first tooth portion 14 in one of them axle section for first tooth portion 14 and transmission post 13 structure as an organic whole not only is convenient for machine-shaping, can further improve transmission post 13's intensity and rigidity moreover, and can make whole transmission post 13 littleer under the circumstances of guaranteeing transmission post 13 structural strength, more satisfies the demand of assembling in the narrow and small assembly space in the aircraft nose. In addition, during assembly, the first tooth part 14 can be restrained and positioned through the restraining and positioning transmission column 13, so that the assembly is more convenient, the internal structure of the machine head can be simplified, and the cost is reduced.

It will be appreciated that in practice, the teeth of the first tooth portion 14 may be rounded in the circumferential direction of the drive post 13 to effect rotation at a particular angle, while in a preferred embodiment, the teeth of the first tooth portion 14 may be rounded in the circumferential direction of the drive post 13 to effect rotation at any angle.

In order to facilitate the rational arrangement of the position of the first motor 11, in a further embodiment the rotary drive module 1 further comprises a first transmission 12, the first motor 11 being in driving connection with the drive column 13 via the first transmission 12. By configuring the first transmission mechanism 12, the position of the first motor 11 can be more flexibly arranged, so that a narrow assembly space in the machine head can be more reasonably utilized. In practice, the first transmission 12 may comprise a coupling or a gear transmission or a belt transmission. As an example, as shown in fig. 4, the first transmission mechanism 12 is a synchronous belt 123 transmission mechanism, and the synchronous belt 123 transmission mechanism includes a driving pulley 121 disposed on an output shaft of the first motor 11, a synchronous belt 123, and a driven pulley 122 disposed on the driving post 13, where the synchronous belt 123 is tensioned between the driving pulley 121 and the driven pulley 122, so that the driving post 13 can be driven to rotate by using the first motor 11.

As shown in fig. 4 and 6, in one embodiment, the second teeth 51 on the two limit collars 5 are respectively meshed with the first teeth 14 on the driving post 13, and because straight teeth are adopted, the length direction of the straight teeth is parallel to the length direction (axial direction) of the needle bar 4, and a certain gap is also formed between the mutually meshed teeth, so that the limit collars 5 can move back and forth relative to the driving post 13 along the length direction of the needle bar 4 under the driving of the connector 23, thereby realizing the puncturing action of the needle bar 4, and in the process of performing the puncturing action of the needle bar 4, the second teeth 51 are always in a meshed state with the first teeth 14, namely, in the limit position, the partial region of the teeth is still kept in a meshed state with the first teeth 14 along the length direction of the teeth in the second teeth 51. Of course, in order to improve the stability of engagement, in a preferred embodiment, the second tooth portion 51 may be always in a completely engaged state with the first tooth portion 14 during the puncturing operation of the needle bar 4, that is, the teeth engaged with the first tooth portion 14 along the length direction of the teeth in the second tooth portion 51, and the entire teeth are engaged with the first tooth portion 14, that is, the second tooth portion 51 does not exceed the range of the first tooth portion 14 during the puncturing operation of the needle bar 4. For convenience of explanation, as shown in fig. 6, at this time, the length of the teeth in the first tooth portion 14 is L, the lengths of the teeth in the two limit retainers 5 are L1 and L2, the distance between the two limit retainers 5 is H, and the maximum penetration stroke of the needle shaft 4 is W, where l+h+l1+l2+w. Therefore, the second tooth parts 51 on the two limiting check rings 5 are always in a complete meshing state with the first tooth parts 14 in the puncture stroke range of the needle bar 4, so that the transmission is stable, the transmission precision is high, and the stability and the precision of the sewing are improved.

According to the sewing machine provided by the embodiment, the first tooth part 14 is arranged in the rotary driving module 1, and the first tooth part 14 is meshed with the second tooth part 51, so that the rotary power is transmitted to the needle bar 4 by utilizing the meshing of the first tooth part 14 and the second tooth part 51, the problem that the needle bar 4 is driven to rotate by the first motor 11 can be solved, in the rotating process, the needle bar 4 is not in direct contact and friction with the rotary driving module 1, the abrasion of the needle bar 4 can be avoided, the anti-fatigue strength of the needle bar 4 can be effectively improved, the stress condition in the action process of the needle bar 4 can be effectively improved, the load on the needle bar 4 is reduced, and the stability and the service life of the needle bar 4 are improved; by constructing the teeth of the first tooth portion 14 and the teeth of the second tooth portion 51 as straight teeth, the length direction of the straight teeth is parallel to the length direction of the needle bar 4, and simultaneously constructing the length of the teeth in the first tooth portion 14 to be longer than the length of the teeth in the second tooth portion 51, the first tooth portion 14 and the second tooth portion 51 can always maintain the meshed state during the puncturing operation of the needle bar 4, and the design is as follows: first, can effectively prevent first tooth portion 14 and second tooth portion 51 mutually separate, can effectively avoid the problem that how to realign, how to prevent the meshing process from bumping, how to guarantee meshing precision etc. that the re-meshing process brought to can effectively simplify mechanical structure and effectively reduce the control degree of difficulty. Secondly, make the lift puncture action and the rotation action of needle bar 4 mutually noninterfere to can be more smooth and easy mutually supporting, and in the in-process of needle bar 4 puncture action and rotation action, needle bar 4 also can not with rotatory drive module 1 direct contact and friction, can effectively avoid needle bar 4 to take place wearing and tearing, effectively improve the antifatigue intensity and the life of needle bar 4, the fact proves that the life of needle bar 4 is showing in this sewing machine increases, and needle bar 4 in the high-speed sewing machine can both be used more than half year at least generally, and change frequency is showing and is reducing, use cost is showing also reducing. Thirdly, can greatly reduced the load on the needle bar 4, simultaneously, the needle bar 4 also does not have the problem that the heat is concentrated, the distribution is inhomogeneous for the needle bar 4 is more stable in the sewing process, and is difficult to warp, is favorable to improving sewing accuracy and sewing quality of sewing machine. Fourth, noise generated during the operation of the needle bar 4 can be effectively reduced, and particularly, friction sound is not generated during the high-speed operation. Fifth, the needle bar 4 does not need to be processed and improved, the existing conventional needle bar 4 is adopted, the universality is better, and the cost is lower.

Example 2

In order to solve the problem of adapting to the narrow assembly space in the sewing machine head, the main difference between the present embodiment 2 and the above embodiment 1 is that, in the sewing machine provided in this embodiment, the other shaft section of the transmission post 13 is further configured with a third tooth portion 16, the third tooth portion 16 includes teeth configured on the shaft section, and the teeth enclose a circle along the circumferential direction of the shaft section, as shown in fig. 7-9, at this time, the rotation driving module 1 further includes a first transmission mechanism 12, where the first transmission mechanism 12 is in transmission connection with the third tooth portion 16, so that the transmission post 13 is driven to rotate by the third tooth portion 16, the first tooth portion 14 drives the second tooth portion 51 to rotate by the transmission post 13, and finally, the needle bar 4 is driven to rotate by the second tooth portion 51.

In this embodiment, by integrating the first tooth portion 14 and the third tooth portion 16 on the driving post 13 at the same time, it is convenient for integrally processing and forming, on one hand, not only the structural strength of the driving post 13 can be effectively ensured, but also the whole assembly in the machine head of the sewing machine is convenient, and it is unnecessary to configure separate positioning structures and constraint structures for the first tooth portion 14 and the third tooth portion 16, respectively, so that the requirement on the installation space can be reduced; on the other hand, the whole transmission column 13 can be made smaller under the condition of ensuring the structural strength, and is more suitable for a narrow installation space in the sewing machine head.

The third tooth portion 16 has various embodiments, and when the first transmission mechanism 12 is a gear transmission mechanism, the teeth in the third tooth portion 16 may be straight teeth or helical teeth. When the first transmission mechanism 12 adopts a synchronous belt 123 transmission mechanism, the teeth in the third tooth portion 16 adopt teeth of the synchronous belt 123, as shown in fig. 7-9, for example, in an embodiment, the first transmission mechanism 12 includes a driving pulley 121 and a synchronous belt 123, the synchronous belt 123 is tensioned between the driving pulley 121 and the third tooth portion 16, as shown in fig. 9, the first motor 11 is in transmission connection with the driving pulley 121, so that the driving pulley 121, the synchronous belt 123 and the third tooth portion 16 can form the synchronous belt 123 transmission mechanism, and the first motor 11 can drive the transmission post 13 to rotate through the synchronous belt 123 transmission mechanism, so as to achieve the purpose of driving the needle bar 4 to rotate. In practice, the driving pulley 121 may be directly mounted on the output shaft of the first motor 11, as shown in fig. 9, or may be in driving connection with the output shaft of the first motor 11 by a conventional transmission mechanism.

Because the assembly space of the machine head is narrow, the maximum diameter of the transmission column 13 is smaller, because the length of the first tooth portion 14 is longer, the processing distance is larger, the transmission column 13 is easy to deform in the process of processing the first tooth portion 14 (namely, in the process of hobbing), in order to solve the technical problem, in a further scheme, at least one shaft section is reserved between the first tooth portion 14 and the second tooth portion 51 along the length direction of the transmission column 13, the outer diameter of the shaft section adjacent to the first tooth portion 14 is smaller than the outer diameter of the first tooth portion 14 and is larger than or equal to the outer diameter of the second tooth portion 51, and the shaft section is structured as an optical axis 17, for example, as shown in fig. 7 and 9, the outer diameter of the shaft section is smaller than the outer diameter of the first tooth portion 14 and is larger than or equal to the outer diameter of the second tooth portion 51, on the one hand, the first tooth portion 14 and the second tooth portion 51 are spaced apart from each other, so that the outer diameter of the first tooth portion 14 and the second tooth portion 51 can be respectively spaced apart from each other, the outer diameter of the first tooth portion 14 and the second tooth portion 51 can be prevented from being deformed, and the deformation of the transmission column 13 can be greatly improved, and the transmission column is also processed in the process of the large distance is easy to be processed, and the transmission column is stable, and the diameter is easy to be processed.

It will be appreciated that in this embodiment, the outer diameter refers to the outer diameter and the inner diameter refers to the inner diameter.

Example 3

In the process of performing the high-speed piercing action on the needle rod 4, the second tooth portion 51 moves at a high speed relative to the first tooth portion 14, and the driving post 13 and the first tooth portion 14 are in a static state, so that the second tooth portion 51 generates a force along an axial direction of the driving post 13, so that the driving post 13 is easy to have an axial movement problem, in order to solve the technical problem, the main difference between the embodiment 3 and the embodiment 1 or 2 is that the sewing machine provided by the embodiment further includes a first limiting structure 61 adapted to the driving post 13 and a second limiting structure 62 adapted to the driving post 13, wherein the first limiting structure 61 is used for limiting the movement of the driving post 13 along one axial direction (the axial direction of the driving shaft 31), and correspondingly, the second limiting structure 62 is used for limiting the movement of the driving post 13 along the other axial direction, and the driving post 13 can be limited by the cooperation of the first limiting structure 61 and the second limiting structure 62, so that the high-speed piercing action of the needle rod 4 can be effectively prevented from driving the driving post 13 to move axially.

In implementation, the first limiting structure 61 and the second limiting structure 62 have various embodiments, for example, the first limiting structure 61 may be disposed at a shoulder of the driving post 13, the first limiting structure 61 may be a block, a baffle, etc. disposed on a casing in the machine head, and similarly, the second limiting structure 62 may be disposed at a shoulder of the driving post 13, and the second limiting structure 62 may also be a block, a baffle, etc. disposed on a casing in the machine head. For another example, the first limiting structure 61 may be disposed at an end of the driving post 13, where the first limiting structure 61 may be a limiting block, a limiting plate, etc. disposed on a casing in the machine head. Similarly, the second limiting structure 62 may be disposed at an end of the driving post 13, where the second limiting structure 62 may be a limiting block, a limiting plate, etc. disposed on the casing in the machine head. As an example, as shown in fig. 10, in the present embodiment, the first limiting structure 61 and the second limiting structure 62 are limiting blocks disposed at two ends of the driving post 13, and the limiting blocks are detachably fixed to the casing, so that the two ends of the driving post 13 are limited by the limiting blocks, and thus the driving post 13 can be effectively prevented from moving axially.

Example 4

Since the needle bar 4 is a wearing part, and needs to be replaced when the processing requirement is not satisfied, but in order to solve the problem of being convenient for replacing the needle bar 4, the main difference between the present embodiment 4 and the above embodiment 1 or 2 or 3 is that, in the sewing machine provided in this embodiment, the limiting retainer 5 is configured with a central hole 52 and a connecting hole 53 adapted to the needle bar 4, as shown in fig. 11, one end of the connecting hole 53 is communicated with the central hole 52, the other end penetrates through the outer side surface of the limiting retainer 5, and the connecting hole 53 is configured with an internal thread 531.

Correspondingly, the needle rod 4 is further provided with a fastener 9, as shown in fig. 11, the fastener 9 is provided with an external thread which is matched with the internal thread 531, so that the fastener 9 can be in threaded connection with the limit retainer ring 5, the needle rod 4 is tightly propped by the fastener 9, the limit retainer ring 5 is fixed in a propping mode, the position of the limit retainer ring 5 is convenient to install, detach and adjust, the needle rod 4 is convenient to replace and assemble, the limit retainer ring 5 can be more firmly installed on the needle rod 4, the connection strength of the limit retainer ring 5 and the needle rod 4 is remarkably improved, larger torque is transmitted to the needle rod 4 through the limit retainer ring 5, and the requirement of driving the needle rod 4 to rotate by the limit retainer ring 5 can be met.

In implementation, the number of the connecting holes 53 can be one, two or more, the number of the fastening pieces 9 is matched with the connecting holes 53, when the connecting holes 53 comprise at least two connecting holes 53, the connecting holes 53 can be uniformly distributed along the circumferential direction of the limit retainer ring 5, so that the needle rod 4 can be uniformly jacked along the circumferential direction of the needle rod 4, on one hand, the stress of the needle rod 4 can be effectively improved, the stress of the needle rod 4 is more balanced, on the other hand, the position of the limit retainer ring 5 is more favorable for adjusting, the central axis of the limit retainer ring 5 can be coincident with the central axis of the needle rod 4, the transmission precision is favorably improved, and the problem of ensuring the transmission precision is solved.

The foregoing is merely illustrative of the present invention, and the present invention is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present invention.

Claims (10)

1. The utility model provides a rotatable sewing machine of needle bar, includes casing, needle bar, puncture drive module and rotation drive module, and the needle bar is provided with spacing retaining ring, and puncture drive module is connected with the needle bar transmission for the drive needle bar carries out the puncture action, and characterized in that, rotation drive module includes first motor and first tooth portion, first motor is installed in the casing, first tooth portion rotatable coupling is in the casing,

At least one limit retainer ring is provided with a second tooth part, the second tooth part comprises teeth matched with the first tooth part, each tooth is respectively arranged along the circumferential direction of the needle bar, the teeth are straight teeth,

the first motor is connected with the first tooth part in a transmission way and is used for driving the first tooth part to rotate, the first tooth part is meshed with the second tooth part and is used for driving the needle bar to rotate,

the length of the teeth in the first tooth part is longer than that of the teeth in the second tooth part, and the first tooth part and the second tooth part keep an engaged state in the process of puncturing the needle rod.

2. The needle bar rotatable sewing machine of claim 1, wherein the penetration drive module comprises a second motor, a penetration drive mechanism, and a connector for adapting the needle bar, wherein,

the connector is limited between the two limiting check rings, the needle bar can rotate relative to the connector,

the second motor is installed in the casing, and the second motor passes through puncture actuating mechanism and connector transmission to be connected for the length direction of drive connector along the needle bar removes.

3. The needle bar rotatable sewing machine of claim 2, wherein two limit stops are respectively configured with the second tooth portions, the two limit stops respectively engaging with the first tooth portions.

4. A needle bar rotatable sewing machine according to claim 3 wherein the length of the teeth in the first tooth portion is L, the lengths of the teeth in the two limit stops are L1 and L2, respectively, the spacing between the two limit stops is H, and the maximum penetration stroke of the needle bar is W, wherein l+h+l1+l2+w.

5. The needle bar rotatable sewing machine of claim 2, wherein the puncture driving mechanism comprises a transmission shaft, a balance block, a crank shaft, a connecting rod and a guiding structure, wherein the transmission shaft is rotatably connected with the machine shell, the second motor is in transmission connection with the transmission shaft and is used for driving the transmission shaft to rotate, the balance block is arranged on the transmission shaft, one end of the crank shaft is eccentrically connected with the balance block, the upper end of the connecting rod is rotatably connected with the crank shaft, the lower end of the connecting rod is rotatably connected with the connecting head, one end of the connecting head is movably restrained on the guiding structure, and the guiding structure is vertically arranged on the machine shell and is used for vertically lifting and guiding the connecting head;

and/or, still include the rotating shuttle mechanism of adaptation needle bar, the needle bar sets up in the position of corresponding rotating shuttle mechanism.

6. The sewing machine with rotatable needle bar according to claim 1, wherein the limit retainer is configured with a central hole adapted to the needle bar and a connecting hole, one end of the connecting hole is communicated with the central hole, the other end penetrates through the outer side surface of the limit retainer, the connecting hole is configured with an internal thread,

The needle rod is characterized by further comprising a fastener, wherein the fastener is provided with external threads matched with the internal threads, and the fastener is connected with the limiting retainer ring in a threaded manner and abuts against the needle rod.

7. The sewing machine of any of claims 1-6, wherein the rotary drive module comprises a gear and a drive post, the first tooth portion is a tooth configured on the gear, the tooth is a straight tooth, the gear is mounted on the drive post, the drive post is rotatably disposed on the housing, the drive post is parallel to the needle bar, and the first motor is in driving connection with the drive post.

8. The sewing machine of any of claims 1-6, further comprising a drive post rotatably disposed on the housing, wherein the first tooth portion is a tooth disposed on the drive post, wherein the tooth is a straight tooth, wherein the drive post is parallel to the needle bar, and wherein the first motor is in driving connection with the drive post.

9. The needle bar rotatable sewing machine of claim 8 wherein the rotary drive module further comprises a first drive mechanism, the first motor being drivingly connected to the drive post by a first drive mechanism, the first drive mechanism comprising a coupling or gear drive mechanism or belt drive mechanism.

10. The needle bar rotatable sewing machine of claim 8, further comprising a first limit structure adapted to the drive post for limiting movement of the drive post in one of the axial directions and a second limit structure adapted to the drive post for limiting movement of the drive post in the other axial direction.