CN219410147U - Rotating shuttle with needle protection function and sewing machine - Google Patents

Abstract

The utility model provides a rotating shuttle with a needle protection function and a sewing machine, wherein the rotating shuttle comprises a shuttle frame provided with a needle falling groove, and the needle falling groove extends along the circumferential direction of the shuttle frame and is used for allowing a needle in the sewing machine to pass through; along the axial direction of the rotating shuttle, a left needle protecting surface and a right needle protecting surface are arranged in the needle falling groove of the shuttle frame, and the left needle protecting surface and the right needle protecting surface are respectively distributed on the left side and the right side of the needle in a close proximity mode. The left needle protection surface is distributed on the left side of the needle in a nearest neighbor mode, the left needle protection surface is matched with the right needle protection surface, deformation generated by the needle is limited in a certain range effectively, and the amplitude of the needle is reduced. Particularly, when the needle belt suture passes through the needle falling groove and rises upwards from the lowest point, the left needle protecting surface can drive the part of the suture on the left side of the needle to move to the right side of the needle, so that the thread ring on the right side of the needle is enlarged, the shuttle point of the rotating shuttle is easily and effectively hooked into the thread ring on the right side of the needle, and the occurrence probability of faults such as jumpers, split threads and broken threads is reduced.

Description

Rotating shuttle with needle protection function and sewing machine

Technical Field

The utility model relates to the technical field of sewing machines, in particular to a rotating shuttle with a needle protection function and a sewing machine with the rotating shuttle.

Background

The rotating shuttle is an important component of the sewing machine, and is used for fixing the end part of a lower shaft which can rotate in the sewing machine and for hooking threads. The rotating shuttle is matched with the needle in the sewing machine to form stitch on the sewing material.

As shown in fig. 1, the rotating shuttle 10 mainly includes a bobbin holder 20 and a bobbin bed 30 assembled at the outer circumference of the bobbin holder 20, the right end of the bobbin bed 30 is fixed at the end of the lower shaft by a plurality of screws, and the bobbin bed 30 is integrally provided with a shuttle tip for hooking a thread; a needle drop slot 21 is formed at the left end of the shuttle frame 20, and the needle drop slot 21 allows the needle 40 to pass up and down. In the rotating shuttle shown in fig. 1, the right side of the needle drop groove 21 is a right needle protection plane, the right needle protection plane extends straight along the axial direction of the rotating shuttle, and the left side of the needle drop groove 21 has no needle protection structure, namely, the side is far away from the needle, and only a dead zone is formed between the needle and the needle, so that faults such as large amplitude of the needle, jumper wire, broken wire and the like are easy to occur.

In particular, in order to ensure that a good stitch is formed during normal operation of the sewing machine, no faults such as jumper wire, broken thread and the like occur, a gap between the rotating shuttle point and the needle in the lower axial direction and the rotating shuttle thread hooking time must be ensured. Therefore, when the sewing machine leaves the factory, the machine needle model is preset according to the common scene of a customer, and meanwhile, the clearance between the rotating shuttle point and the machine needle is adjusted to the optimal condition, and the probability of needle skipping is minimum. However, after the sewing machine enters the market, the garment style and the cloth thickness change drastically throughout the year, and in order to cope with the changes, the stitch, the needle, etc. are often adjusted according to the needs of the customer. However, after the machine needles of different types (the machine needles have different thicknesses) are replaced, the clearance between the shuttle point of the rotating shuttle and the machine needle is changed; after the thin and thick cloth is replaced, the friction force of the cloth on the suture is changed to cause the size of the thread hooking ring to be changed, so that the sewing machine loses the optimal working condition, and faults such as needle skipping, thread breakage, thread splitting and the like frequently occur.

In order to solve the problems of needle skipping, thread breakage, thread splitting and the like, the scheme adopted in the industry at present is as follows: after the needles of different types (with different thicknesses) are replaced, in order to ensure no or less jumps, the clearance between the rotating shuttle point and the needle and the thread hooking time must be checked again, and if necessary, the lifting height of the needle can be adjusted. When the clearance between the shuttle point of the rotating shuttle and the needle and the thread hooking time are adjusted, three fastening screws for fixing the rotating shuttle on the lower shaft are required to be loosened, the rotating shuttle is moved along the front, back, left and right directions, the installation position of the rotating shuttle is adjusted, and the fastening screws are screwed down after the optimal installation position of the rotating shuttle is found. The adjusting process is complicated, particularly, the clearance between the rotating shuttle and the needle is controlled to be the most critical process and technical requirement in the assembly of the sewing machine, the sewing machine is required to be stopped, and an operator is required to have a high maintenance level of the sewing machine, so that the sewing working efficiency of the sewing machine is affected, and the running and maintenance cost of the sewing machine is improved. Meanwhile, as the cloth sewn by the sewing machine is changed in many ways, the scene of the thin and thick change of the cloth is complex, the change is frequent, the sewing machine is difficult to adapt to the scene change, and the faults of wire jumping, wire breaking and wire splitting are frequent, so that the sewing quality is reduced. The sewing machine has huge adjustment and maintenance tasks, and the cost of after-sales service is increased.

Disclosure of Invention

In view of the above-mentioned drawbacks of the prior art, an object of the present utility model is to provide a rotating shuttle with needle protection, which reduces the amplitude of the needle, and which enables the shuttle tip to effectively hook the thread loop.

In order to achieve the above-mentioned purpose, the present utility model provides a rotating shuttle with needle protection function, comprising a shuttle frame provided with a needle drop groove, wherein the needle drop groove extends along the circumferential direction of the shuttle frame and is used for allowing a needle in a sewing machine to pass through; along the axial direction of the rotating shuttle, the shuttle frame is provided with a left needle protecting surface and a right needle protecting surface in the needle falling groove, and the left needle protecting surface and the right needle protecting surface are respectively distributed on the left side and the right side of the machine needle in a close proximity mode.

Optionally, the left side groove wall surface part or the whole of the needle falling groove forms a left needle protection surface, and the right side groove wall surface part or the whole of the needle falling groove forms a right needle protection surface.

Optionally, the shuttle frame further comprises a movable needle protection baffle, the movable needle protection baffle is movably arranged on the shuttle frame along the axial direction of the rotating shuttle, the right side groove wall surface part or the whole body of the needle falling groove forms a right needle protection surface, and the left needle protection surface is fixedly arranged on the movable needle protection baffle.

Optionally, the movable needle protection baffle includes baffle main part, connecting portion and the needle protection board portion that the integral type links to each other in proper order, be formed with between baffle main part, connecting portion and the needle protection board portion and allow the dodge breach that the needle fall groove exposes, the baffle main part is movably installed in shuttle frame, the needle protection board portion distributes in the left side of needle, the needle protection board portion is towards the side part of needle or wholly constitutes left needle protection face.

Optionally, the shuttle frame further comprises an adjusting screw, a guide rail which is in sliding fit with the baffle main body is fixedly arranged on the outer peripheral surface of the shuttle frame, an adjusting groove is formed in the baffle main body, the guide rail and the adjusting groove extend straight along the moving direction of the movable needle protection baffle, the baffle main body and the shuttle frame are fixed through the adjusting screw, and the adjusting screw is arranged in the adjusting groove in a penetrating mode.

Optionally, the left needle guard surface and the right needle guard surface are radial planes extending straight along the radial direction of the shuttle frame.

Optionally, at least one of the left needle guard surface and the right needle guard surface is provided with an inclined section extending obliquely in the extending direction of the needle dropping groove, and the inclined section makes the working gap between the left needle guard surface and the right needle guard surface have different axial widths.

Optionally, the left needle guard face and the right needle guard face are both provided with the inclined section.

Optionally, the inclined section of the left needle protection surface is a left inclined section, and the inclined section of the right needle protection surface is a right inclined section; along the extending direction of needle falling groove, left side needle protection face still includes the straight section of first left side and the straight section of second left side of establishing respectively at left inclined section both ends, right side needle protection face still includes the straight section of first right side and the straight section of second right side of establishing respectively at right inclined section both ends, straight section in first left side, straight section in second left side, straight section in first right side and straight section in second right side all extend along the circumference of shuttle frame is straight.

Optionally, the left inclined section is inclined in a direction opposite to that of the right inclined section.

Optionally, the left inclined section has an inclination angle greater than an inclination angle of the right inclined section.

Optionally, the rotating shuttle further comprises a clearance adjustment assembly, wherein the clearance adjustment assembly is connected with the shuttle frame and used for driving the shuttle frame to rotate around the axis of the rotating shuttle frame.

Optionally, the clearance adjustment assembly includes along the radial movable regulation locating plate of shuttle frame, be equipped with the locating hook on the regulation locating plate, the outward flange side of shuttle frame has seted up and has adjusted the constant head tank, the locating hook with adjust the constant head tank looks block.

Optionally, the gap adjusting assembly further comprises a guide pin fixedly arranged, a guide groove extending straight along the moving direction of the guide pin is formed in the adjusting and positioning plate, and the guide pin is arranged in the guide groove in a penetrating manner and is in sliding fit with the guide groove.

Optionally, a scale is arranged on the adjusting and positioning plate, and the scale is used for representing the size of a working gap between the left needle protection surface and the right needle protection surface at the position right below the needle.

Optionally, the outer ends of the left needle protection surface and the right needle protection surface are provided with chamfer portions, and the chamfer portions are arc surfaces or inclined surfaces.

Optionally, a clearance between the left needle protection surface and the needle in the axial direction of the rotating shuttle is 0.15 plus or minus 0.15mm, and a clearance between the right needle protection surface and the needle in the axial direction of the rotating shuttle is 0.15 plus or minus 0.15mm.

The present application also provides a sewing machine equipped with the rotating shuttle as described above.

As described above, the rotating shuttle with needle protection function and the sewing machine according to the present utility model have the following advantages:

in the rotating shuttle, the new increase is distributed on the left needle protection surface on the left side of the needle in a neighboring way. Therefore, when the sewing machine works normally, as the left needle protection surface and the right needle protection surface are distributed on two sides of the needle in a neighboring way, the left needle protection surface and the right needle protection surface are matched, the vibration deflection of the needle in the left-right direction is limited, the deformation generated by the needle is effectively limited in a certain range, the amplitude of the needle is reduced, and the needle protection effect is achieved. Particularly, when the needle belt suture passes through the needle falling groove and rises upwards from the lowest point, the left needle guard generates a certain extrusion force to the part of the suture on the left side of the needle, so that the part of the suture on the left side of the needle is driven to move to the right side of the needle, and the loop on the right side of the needle is enlarged, and the shuttle point of the rotating shuttle can be hooked into the loop on the right side of the needle more easily and effectively, so that the probability of faults such as jumpers, split lines and broken lines is greatly reduced.

Drawings

Fig. 1 is a schematic structural view of a rotating shuttle in the prior art.

Fig. 2 is a schematic structural view of a first embodiment of the rotating shuttle of the present application, and omits a gap adjusting assembly.

Fig. 3 is a top view of fig. 2.

Fig. 4 is a schematic view of the structure of the bobbin case of fig. 2.

Fig. 5 is a top view of fig. 4.

Fig. 6a to 6d are four preferred embodiments of the left needle guard and the right needle guard of the first embodiment of the rotating shuttle, which are top views.

Fig. 7 is a schematic diagram of the cooperation between the rotating shuttle and the needle according to the first embodiment of the present application.

Fig. 8 is a schematic structural view of a first embodiment of a rotating shuttle in the present application.

Fig. 9 is a schematic structural view of the adjusting and positioning plate in the present application.

Fig. 10 is a schematic structural view of a second embodiment of a rotating shuttle in the present application.

Fig. 11 is a schematic view of the structure of the movable needle guard shield in fig. 10.

Fig. 12a to 12c are three preferred embodiments of the left needle guard and the right needle guard of the second embodiment of the rotating shuttle, which are top views.

Description of element reference numerals

10. Rotating shuttle

20. Shuttle frame

21. Needle falling groove

22. Left needle protection surface

221. Left inclined section

222. First left straight section

223. Second left straight section

23. Right needle protection surface

231. Right inclined section

232. First right straight section

233. Second right straight section

24. Inclined section

25. Adjusting positioning groove

26. Chamfering part

27. Front arc surface

28. Rear arc surface

29. Guide rail

30. Shuttle bed

31. Shuttle point

40. Machine needle

50. Adjusting positioning plate

51. Positioning hook

52. Guide groove

53. Graduation scale

60. Guide pin

70. Wire guide plate

80. Shuttle plate

90. Movable needle protection baffle

91. Baffle main body

92. Connecting part

93. Needle protection plate part

94. Avoidance gap

95. Adjusting groove

110. Adjusting screw

Detailed Description

Further advantages and effects of the present utility model will become apparent to those skilled in the art from the disclosure of the present utility model, which is described by the following specific examples.

It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the utility model to the extent that it can be practiced, since modifications, changes in the proportions, or adjustments of the sizes, which are otherwise, used in the practice of the utility model, are included in the spirit and scope of the utility model which is otherwise, without departing from the spirit or scope thereof. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like are used herein for descriptive purposes only and not for purposes of limitation, and are intended to limit the scope of the utility model as defined by the claims and the relative terms thereof as construed as corresponding to the claims.

It will also be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or be indirectly connected to the other element through intervening elements.

Furthermore, the descriptions of "first," "second," and the like, herein are for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be regarded as not exist and not within the protection scope of the present application.

The present application provides a rotating shuttle 10 having a needle protecting function, and a sewing machine equipped with the rotating shuttle 10. Generally, as shown in fig. 7, the sewing machine includes a lower shaft rotatably fitted in a bottom plate of the sewing machine, and a needle 40 movable up and down. For convenience of description, in the following embodiments, the axial direction of the lower shaft is defined as the left-right direction, the direction of the lower shaft facing the sewing machine head is the left direction, and the direction of the lower shaft facing the sewing machine tail is the right direction; the direction intersecting the left-right direction in the horizontal plane is defined as the front-rear direction. Thus, in the views shown in fig. 3 and 5, the left and right sides of the paper surface are left and right directions, respectively, and the upper and lower sides of the paper surface are front and rear directions, respectively.

As shown in fig. 2, 3 and 7, the rotating shuttle 10 includes a bobbin case 20, a bobbin case 30 fitted to the outer circumference of the bobbin case 20, and a thread guide plate 70 and a bobbin plate 80 fixed to the outer circumference of the bobbin case 30; wherein, the shuttle head 31 is integrally provided on the left section of the shuttle bed 30, and the shuttle head 31 is distributed on the outer circumference side of the shuttle frame 20; the right-hand portion of the shuttle bed 30 is fixed to the left end of the lower shaft by a plurality of screws, thereby integrally fixing the rotating shuttle 10 to the left end of the lower shaft. The axial direction of the rotating shuttle 10 is identical to the axial direction of the lower shaft, and the axial direction of the rotating shuttle 10 is the axial direction of the shuttle frame 20 and the axial direction of the shuttle bed 30, both being the left-right direction.

As shown in fig. 2 to 5 and fig. 7, the bobbin holder 20 is provided with a needle drop groove 21, the needle drop groove 21 extends along the circumferential direction of the bobbin holder 20, and the needle drop groove 21 is used for allowing the needle 40 of the sewing machine to pass through. In particular, the bobbin holder 20 is provided with a left needle protection surface 22 and a right needle protection surface 23 in the needle drop groove 21; along the axial direction of the rotating shuttle 10, i.e. in the left-right direction, the left needle protecting surface 22 is adjacently distributed on the left side of the needle 40, and the right needle protecting surface 23 is adjacently distributed on the right side of the needle 40. In the application, the range of the left-right clearance between the left needle protection surface 22 and the needle 40 in the axial direction of the rotating shuttle 10 is 0.15 plus or minus 0.15mm, so that the left needle protection surface 22 is distributed on the left side of the needle 40 in a neighboring manner; the range of the left-right clearance between the right needle protecting surface 23 and the needle 40 in the axial direction of the rotating shuttle 10 is 0.15 plus or minus 0.15mm, so that the right needle protecting surface 23 is distributed on the right side of the needle 40 in a neighboring way. Compared with the prior art, the rotating shuttle 10 disclosed in the application has the advantages that the left needle protecting surface 22 which is adjacently distributed on the left side of the needle 40 is additionally arranged, and the left needle protecting surface 22 and the right needle protecting surface 23 are matched, so that at least the rotating shuttle 10 disclosed in the application has the following advantages.

1. During normal operation of the sewing machine, the needle 40 is deformed, bent and vibrated due to the resistance of the needle 40 in the process of puncturing cloth at a high speed and the lateral tension of the suture at the same time when the needle 40 is in lateral tension; the left needle protection surface 22 and the right needle protection surface 23 distributed by the adjacent needle 40 are respectively arranged on the left side and the right side of the needle 40, the left needle protection surface 22 is matched with the right needle protection surface 23, vibration deflection of the needle 40 in the left-right direction is limited, deformation generated by the needle 40 is effectively limited in a certain range, vibration amplitude of the needle 40 can be reduced under the condition of high-speed movement of the needles 40 of different types, good needle protection effect is achieved, the needles 40 of different types can be well protected, the needle 40 is always kept from colliding with the shuttle point 31 of the rotary shuttle 10, and fault probability of the shuttle point 31 colliding the needle 40 is greatly reduced.

2. When the needle 40 with the suture passes through the needle drop slot 21 and rises upwards from the lowest point, under the same adjustment of the lifting parameters of the needle 40, the left needle protection surface 22 generates a certain extrusion force on the part of the suture on the left side of the needle 40, so that the part of the suture on the left side of the needle 40 is driven to move to the right side of the needle 40, the thread loop on the right side of the needle 40 is enlarged, the suture forms a larger thread loop on the right side of the needle 40, and the shuttle point 31 of the rotating shuttle 10 can be hooked into the thread loop on the right side of the needle 40 more easily and effectively, thereby greatly reducing the occurrence probability of faults such as jumpers, split threads, broken threads and the like.

3. After the loop on the right side of the needle 40 is enlarged, the lifting height of the needle 40 can be reduced under the same condition, the thread hooking time of the rotating shuttle 10 can be advanced, and the sewing machine can work in the optimal state.

4. The length of continuous threads of the horizontal rotary shuttle 10 sewing machine during high-speed operation is effectively prolonged, and the working efficiency and the stitch quality are improved.

5. The use scene of the silk ray is optimized and enlarged.

6. At the moment the needle 40 completes the piercing, the needle tip of the needle 40 generates high temperature due to friction with the compacted cloth, and in general, the temperature rise gradually builds up, and the upper thread (especially the chemical fiber thread) is fused until the needle 40 reaches the melting point (230-300 ℃) of the suture. After the left needle protection surface 22 and the right needle protection surface 23 are arranged, the machine needle 40 can be in contact with the left needle protection surface 22 and the right needle protection surface 23 due to vibration, heat generated instantaneously is transferred to the rotating shuttle 10, and meanwhile, the temperature of the machine needle is reduced, so that the temperature of the machine needle 40 is kept to be always lower than the melting temperature of a suture, and the highest sewing speed of a chemical fiber suture is improved.

Further, the arrangement of the left needle protecting surface 22 and the right needle protecting surface 23 on the shuttle frame 20 is various, and the shuttle frame 20 has a plurality of embodiments based on different arrangement modes, that is, the rotating shuttle has a plurality of embodiments. Two preferred embodiments of the rotating shuttle are provided below.

Rotating shuttle embodiment one

In the first embodiment of the rotating shuttle, as shown in fig. 4 and 5, the left side groove wall surface of the needle drop groove 21 integrally forms the left needle protecting surface 22, and the right side groove wall surface of the needle drop groove 21 integrally forms the right needle protecting surface 23, and then both the left needle protecting surface 22 and the right needle protecting surface 23 are integrally formed on the shuttle frame 20. The front end of the left needle protection surface 22 is in transitional connection with the front end of the right needle protection surface 23 through a front arc surface 27, the rear end of the left needle protection surface 22 is in transitional connection with the rear end of the right needle protection surface 23 through a rear arc surface 28, and the front arc surface 27 and the rear arc surface 28 respectively form a front side groove wall surface and a rear side groove wall surface of the needle falling groove 21. In addition, the left needle guard surface 22 and the right needle guard surface 23 are radial planes extending straight in the radial direction of the bobbin holder 20, that is, the left needle guard surface 22 and the right needle guard surface 23 are perpendicular to the axial direction of the rotating shuttle 10. Of course, in other embodiments, a part of the left groove wall surface of the needle drop groove 21 may constitute the left needle protection surface 22, and a part of the right groove wall surface of the needle drop groove 21 may constitute the right needle protection surface 23 as a whole.

Further, as shown in fig. 4, the outer end of the left needle protection surface 22 is distributed on the outer peripheral side of the right needle protection surface 23, or the outer end of the left needle protection surface 22 protrudes outwards from the outer end of the right needle protection surface 23, so that the effect of the left needle protection surface 22 for extruding the suture on the left side of the needle 40 to the right side of the needle 40 is improved, the accuracy of hooking the shuttle point 31 of the rotating shuttle 10 on the loop on the right side of the needle 40 is further improved, and the sewing quality is ensured.

Preferably, as shown in fig. 4 and 5, the outer ends of the left needle protection surface 22 and the right needle protection surface 23 are provided with chamfer portions 26, the chamfer portions 26 may be arc surfaces formed by chamfering, and the chamfer portions 26 may be inclined surfaces formed by chamfering. The chamfer 26 at the outer end of the left needle protection surface 22 and the chamfer 26 at the outer end of the right needle protection surface 23 can be arc surfaces, or can be inclined surfaces, or can be arc surfaces, or can be inclined surfaces; in the embodiment shown in fig. 4 and 5, the chamfer 26 at the outer end of the left needle protection surface 22 is an arc surface formed by chamfering, and the chamfer 26 at the outer end of the right needle protection surface 23 is an inclined surface formed by chamfering.

Further, the rotating shuttle 10 according to the present application has a function of steplessly adjusting the gap, that is, the size of the working gap formed between the left needle guard surface 22 and the right needle guard surface 23 in the left-right direction can be steplessly adjusted. Specifically, as shown in fig. 4 and 5, at least one of the left needle shield surface 22 and the right needle shield surface 23 is provided with an inclined section 24, the inclined section 24 extends obliquely in the extending direction of the needle drop groove 21, and the inclined section 24 makes the working gap between the left needle shield surface 22 and the right needle shield surface 23 have different axial widths in the left-right direction. In this way, by driving the shuttle frame 20 to rotate around the central axis thereof by an angle, the axial width of the working gap at the position right below the needle 40 can be adjusted, namely, the left-right gap between the left needle protecting surface 22 and the needle 40 and the left-right gap between the right needle protecting surface 23 and the needle 40 are adjusted steplessly, so that the needle 40 is in the optimal working gap, and the two functions of ensuring that the needles 40 with different types and different thicknesses can be better: the left needle protection surface 22 and the right needle protection surface 23 are limited left and right to reduce the amplitude, and the left needle protection surface 22 enlarges the loop on the right side of the needle 40 through the loop on the left side of the extruder needle 40, so that the thread hooking function can be stably realized under the conditions that different fabrics are sewn and the needles 40 with different types are configured by the sewing machine, and the application range and the sewing performance of the sewing machine are innovatively and effectively improved.

Further, in the bobbin holder 20 of the rotary hook 10, the inclined section 24 may be provided only on the left needle guard surface 22, the inclined section 24 may be provided only on the right needle guard surface 23, and the inclined section 24 may be provided on both the left needle guard surface 22 and the right needle guard surface 23. The bobbin cradle 20 is made to have a number of preferred embodiments based on the different arrangements of the inclined sections 24. Four preferred embodiments of the bobbin case 20 are provided below.

In the first embodiment of the bobbin carriage 20, as shown in fig. 6a, the left needle protecting surface 22 and the right needle protecting surface 23 are provided with inclined sections 24, the inclined section 24 on the left needle protecting surface 22 is defined as a left inclined section 221, and the inclined section 24 on the right needle protecting surface 23 is defined as a right inclined section 231. The left inclined section 221 is inclined so as to extend more frontward and more leftward, and the right inclined section 231 is inclined so as to extend more frontward and more rightward, and the inclination direction of the left inclined section 221 is opposite to the inclination direction of the right inclined section 231. And, the inclination angle of the left inclined section 221 is greater than that of the right inclined section 231.

Further, as shown in fig. 6a, along the extending direction of the needle drop slot 21, the left needle protecting surface 22 further includes a first left straight section 222 and a second left straight section 223 respectively provided at the front and rear ends of the left inclined section 221, and the right needle protecting surface 23 further includes a first right straight section 232 and a second right straight section 233 respectively provided at the front and rear ends of the right inclined section 231, the first left straight section 222, the second left straight section 223, the first right straight section 232 and the second right straight section 233 all extending straight forward and backward along the circumference of the bobbin holder 20. Accordingly, the left inclined section 221 is distributed substantially at the front-rear middle position of the left needle shield surface 22, and the right inclined section 231 is distributed substantially at the front-rear middle position of the right needle shield surface 23. The left inclined section 221 and the right inclined section 231 make the change law of the working gap between the left needle protection surface 22 and the right needle protection surface 23: the front section has the same size and is a larger gap, the middle section has the same size and is a smaller gap, and the middle section gradually decreases from front to back and can continuously change.

In the second embodiment of the bobbin case 20, as shown in fig. 6b, the left needle guard surface 22 and the right needle guard surface 23 are provided with inclined sections 24, the inclined section 24 on the left needle guard surface 22 is defined as a left inclined section 221, and the inclined section 24 on the right needle guard surface 23 is defined as a right inclined section 231. The left inclined section 221 is inclined so as to extend more frontward and more rightward, and the right inclined section 231 is inclined so as to extend more frontward and more leftward, and the inclination direction of the left inclined section 221 is opposite to the inclination direction of the right inclined section 231. And, the inclination angle of the left inclined section 221 is greater than that of the right inclined section 231.

Further, as shown in fig. 6b, along the extending direction of the needle drop slot 21, the left needle protecting surface 22 further includes a first left straight section 222 and a second left straight section 223 respectively provided at the front and rear ends of the left inclined section 221, and the right needle protecting surface 23 further includes a first right straight section 232 and a second right straight section 233 respectively provided at the front and rear ends of the right inclined section 231, the first left straight section 222, the second left straight section 223, the first right straight section 232 and the second right straight section 233 all extending straight forward and backward along the circumference of the bobbin holder 20. Accordingly, the left inclined section 221 is distributed substantially at the front-rear middle position of the left needle shield surface 22, and the right inclined section 231 is distributed substantially at the front-rear middle position of the right needle shield surface 23. The left inclined section 221 and the right inclined section 231 make the change law of the working gap between the left needle protection surface 22 and the right needle protection surface 23: the front section has the same size and is a smaller gap, the middle section has the same size and is a larger gap, the middle section gradually increases from front to back and can continuously change, and the rear section has the same size.

In the third embodiment of the bobbin holder 20, as shown in fig. 6c, the inclined section 24 is provided only on the left needle guard surface 22, and the inclined section 24 is defined as a left inclined section 221, and the left inclined section 221 is inclined so as to extend more frontward and more leftward. Along the extending direction of the needle drop slot 21, the left needle protecting surface 22 further comprises a first left straight section 222 and a second left straight section 223 which are respectively arranged at the front end and the rear end of the left inclined section 221, and the first left straight section 222, the second left straight section 223 and the whole right needle protecting surface 23 all extend straight forward and backward along the circumference of the shuttle frame 20. Thus, the left inclined section 221 makes the law of change of the working gap between the left needle guard 22 and the right needle guard 23: the front section has the same size and is a larger gap, the middle section has the same size and is a smaller gap, and the middle section gradually decreases from front to back and can continuously change.

In the fourth embodiment of the bobbin carriage 20, as shown in fig. 6d, the inclined section 24 is provided only on the right needle guard surface 23, and the inclined section 24 is defined as a right inclined section 231, and the right inclined section 231 is inclined so as to extend more frontward and more leftward. Along the extending direction of the needle drop slot 21, the right needle protecting surface 23 further includes a first right straight section 232 and a second right straight section 233 respectively provided at the front and rear ends of the right inclined section 231, and the first right straight section 232, the second right straight section 233, and the entire left needle protecting surface 22 all extend straight forward and backward along the circumference of the bobbin case 20. Therefore, the right inclined section 231 makes the working gap between the left needle guard 22 and the right needle guard 23 change regularly: the front section has the same size and is a smaller gap, the middle section has the same size and is a larger gap, the middle section gradually increases from front to back and can continuously change, and the rear section has the same size.

Further, as shown in fig. 8, the first embodiment of the rotating shuttle 10 further includes a gap adjusting component, where the gap adjusting component is connected to the shuttle frame 20 and is used for driving the shuttle frame 20 to rotate around its own axis, so as to adjust the size of the working gap right below the needle 40, that is, adjust the left-right gap between the left needle protection surface 22 and the needle 40 and the left-right gap between the right needle protection surface 23 and the needle 40 for different types of needles 40, so that the needles 40 of different types can work under the optimal working gap conditions, and the probability of common faults such as wire splitting, wire breakage, needle skipping, etc. is reduced.

In this embodiment, the preferable structure of the gap adjusting assembly is: as shown in fig. 8 and 9, the gap adjusting assembly includes an adjusting and positioning plate 50 that can move forward and backward along the radial direction of the shuttle frame 20, a positioning hook 51 is provided on the adjusting and positioning plate 50, an adjusting and positioning groove 25 is provided on the outer edge side of the shuttle frame 20, and the positioning hook 51 is engaged with the adjusting and positioning groove 25. By changing the front and rear mounting positions of the adjusting and positioning plate 50, the circumferential angle of the shuttle frame 20 can be changed, namely, the left and right gaps between the left needle protecting surface 22 and the needle 40 and the left and right gaps between the right needle protecting surface 23 and the needle 40 are changed, so that the work of correcting the gaps between the rotating shuttle 10 and the needle 40 again is reduced and facilitated, and the machine can well complete the thread hooking action. In addition, the adjustment of the forward and backward movement of the adjustment positioning plate 50 may be manual adjustment, or may be performed by using a driving source such as an air cylinder, an electromagnet, or a motor.

Preferably, as shown in fig. 8, the gap adjusting assembly further includes a guide pin 60 fixedly disposed, the guide pin 60 may be a screw, the adjusting positioning plate 50 is provided with a guide groove 52 extending straight back and forth along the moving direction thereof, the guide pin 60 is disposed in the guide groove 52 in a penetrating manner and is in sliding fit with the guide groove 52, so as to improve the stability of the adjusting positioning plate 50 in moving back and forth, i.e. improve the stability of gap adjustment. In addition, as shown in fig. 9, a scale 53 is further provided on the adjusting and positioning plate 50, and the scale 53 is used for characterizing the size of the working gap right below the needle 40, so as to facilitate adjustment.

Rotating shuttle embodiment II

In the second embodiment of the rotating shuttle, as shown in fig. 10, the shuttle frame 20 further includes a movable needle guard 90 which is separately provided, the movable needle guard 90 is mounted on the outer peripheral side of the shuttle frame 20 so as to be movable left and right in the axial direction of the rotating shuttle 10, the right side groove wall surface of the needle drop groove 21 forms the right needle guard 23 partially or entirely, the left needle guard 22 is fixedly provided on the movable needle guard 90, the left needle guard 22 is separately formed on the shuttle frame 20, and the right needle guard 23 is integrally formed on the shuttle frame 20. Thus, the movable needle guard 90 is added to the structure of the existing rotating shuttle, so that the cost is reduced.

Further, as in the first embodiment of the rotary hook, the left needle protecting surface 22 and the right needle protecting surface 23 are radial planes extending straight in the radial direction of the hook frame 20, that is, the left needle protecting surface 22 and the right needle protecting surface 23 are perpendicular to the axial direction of the rotary hook 10. The outer end of the left needle-protecting surface 22 protrudes outwards from the outer end of the right needle-protecting surface 23. The outer ends of the left needle guard surface 22 and the right needle guard surface 23 are provided with chamfer portions 26.

Further, the movable needle guard 90 has the following structure: as shown in fig. 11, the movable needle guard 90 includes a guard body 91, a connecting portion 92, and a needle guard portion 93 integrally connected in this order, the connecting portion 92 being integrally connected between a front edge side of the guard body 91 and a front edge side of the needle guard portion 93, such that a clearance gap 94 allowing the needle drop groove 21 to be exposed is formed between the guard body 91, the connecting portion 92, and the needle guard portion 93, the guard body 91 being movably mounted to the bobbin case 20, the needle guard portion 93 being distributed on a left side of the needle 40, the needle guard portion 93 being directed toward a side surface portion or the whole of the needle 40 to constitute a left needle guard 22, the left needle guard 22 being integrally formed on the movable needle guard 90.

Preferably, as shown in fig. 10 and 11, the shuttle frame 20 further includes an adjusting screw 110, the outer circumferential surface of the shuttle frame 20 is fixedly provided with a guide rail 29 slidably matched with the baffle main body 91, the baffle main body 91 is provided with an adjusting groove 95, the guide rail 29 and the adjusting groove 95 extend straight along the moving direction of the movable needle guard baffle 90, the baffle main body 91 and the shuttle frame 20 are fixed by the adjusting screw 110, and the adjusting screw 110 is arranged in the adjusting groove 95 in a penetrating manner. By the sliding fit of the guide rail 29 and the shutter main body 91 and the sliding fit of the adjusting screw 110 and the adjusting groove 95, the accuracy of the left-right position adjustment of the movable needle guard shutter 90 is ensured, and the forward-backward offset does not occur.

Further, the second embodiment of the rotating shuttle also includes a gap adjusting assembly, which has the same structure as that of the first embodiment of the rotating shuttle, and includes an adjusting and positioning plate 50 provided with a positioning hook 51, and a guide pin 60, which are not unfolded. The left needle guard surface 22 and the right needle guard surface 23 may both extend straight forward and backward along the circumferential direction of the bobbin holder 20, or at least one of them may be provided with an inclined section 24, the inclined section 24 extending obliquely in the extending direction of the needle drop groove 21, and the inclined section 24 may have different axial widths in the left-right direction of the working gap between the left needle guard surface 22 and the right needle guard surface 23. Therefore, in the second rotating shuttle embodiment, when the size of the working gap formed between the left needle protecting surface 22 and the right needle protecting surface 23 in the left-right direction is steplessly adjusted, the size can be achieved by adjusting the left-right position of the movable needle protecting shield 90, the circumferential angle of the shuttle frame 20, and the left-right position of the movable needle protecting shield 90 and the circumferential angle of the shuttle frame 20 at the same time, the adjustment mode is very flexible, the optimal working gap of the needle 40 can be ensured more reliably, and the left needle protecting surface 22 and the right needle protecting surface 23 have very good needle protecting effect on the needles 40 with different thicknesses. Four preferred embodiments of the bobbin carriage 20 are provided below based on the different arrangements of the inclined sections 24.

In the first embodiment of the bobbin case 20, as shown in fig. 12a, the left needle protecting surface 22 and the right needle protecting surface 23 are both extended straight forward and backward along the circumference of the bobbin case 20. Thus, when the adjusting screw 110 is loosened, the shutter body 91 is moved left and right along the guide rail 29 and the adjusting groove 95, and the left needle protection surface 22 is driven to move left and right: when the left needle protection surface 22 moves leftwards, the left needle protection surface 22 is far away from the needle 40 and the right needle protection surface 23, so that the gap between the left needle protection surface 22 and the needle 40 in the left-right direction is enlarged, and the size of the needle 40 with a larger needle size (namely, thicker needle size) is suitable; when the left needle guard 22 moves rightward, the left needle guard 22 approaches the needle 40 and the right needle guard 23, and the gap between the left needle guard 22 and the needle 40 in the left-right direction becomes smaller, which is suitable for the size of the smaller needle (i.e., finer) needle 40. After the adjustment is completed, the adjusting screw 110 is screwed, so that the best clearance is provided between the needle 40 and the needle guard plate 93, and a good sewing effect of greatly reducing the jump needle is achieved.

In the second embodiment of the bobbin case 20, as shown in fig. 12b, the left needle protecting surface 22 extends straight forward and backward along the circumference of the bobbin case 20; the right needle guard surface 23 is provided with an inclined section 24, and the inclined section 24 is defined as a right inclined section 231. The right inclined section 231 is inclined in such a manner as to extend more frontward and more rightward. In addition, along the extending direction of the needle drop slot 21, the right needle protecting surface 23 further includes a first right straight section 232 and a second right straight section 233 respectively provided at the front and rear ends of the right inclined section 231, and the first right straight section 232 and the second right straight section 233 both extend straight back and forth along the circumferential direction of the bobbin case 20, and then the right inclined section 231 is distributed at approximately the front and rear intermediate position of the right needle protecting surface 23. The right inclined section 231 makes the working gap between the left needle protection surface 22 and the right needle protection surface 23 change regularly: the front section has the same size and is a larger gap, the middle section has the same size and is a smaller gap, and the middle section gradually decreases from front to back and can continuously change.

When the set screw 110 is loosened to move the movable needle guard 90 leftward, the gap between the left needle guard surface 22 and the needle 40 in the left-right direction becomes large, which is suitable for the size of the larger needle size (i.e., thicker) needle 40. When the set screw 110 is loosened to move the movable needle guard 90 rightward, the gap between the left needle guard surface 22 and the needle 40 in the left-right direction becomes smaller, which is suitable for the size of the smaller needle size (i.e., finer) needle 40. When the rearward movement of the adjustment positioning plate 50 drives the shuttle frame 20 to rotate rearward by an angle, the gap between the left needle guard surface 22 and the needle 40 in the left-right direction becomes larger, which is suitable for the size of the larger needle size (i.e., thicker) needle 40. When the forward movement of the adjustment positioning plate 50 drives the shuttle frame 20 to rotate forward by an angle, the gap between the left needle guard surface 22 and the needle 40 in the left-right direction becomes smaller, which is suitable for the size of the smaller needle size (i.e., finer) needle 40.

In the third embodiment of the bobbin case 20, as shown in fig. 12c, the left needle protecting surface 22 and the right needle protecting surface 23 are provided with inclined sections 24, the inclined section 24 on the left needle protecting surface 22 is defined as a left inclined section 221, and the inclined section 24 on the right needle protecting surface 23 is defined as a right inclined section 231. The left inclined section 221 is inclined so as to extend more frontward and more leftward, and the right inclined section 231 is inclined so as to extend more frontward and more rightward, and the inclination direction of the left inclined section 221 is opposite to the inclination direction of the right inclined section 231. And, the inclination angle of the left inclined section 221 is greater than that of the right inclined section 231. Along the extending direction of the needle drop slot 21, the left needle protecting surface 22 further comprises a first left straight section 222 and a second left straight section 223 which are respectively arranged at the front end and the rear end of the left inclined section 221, the right needle protecting surface 23 further comprises a first right straight section 232 and a second right straight section 233 which are respectively arranged at the front end and the rear end of the right inclined section 231, and the first left straight section 222, the second left straight section 223, the first right straight section 232 and the second right straight section 233 all extend straight forward and backward along the circumference of the shuttle frame 20. Accordingly, the left inclined section 221 is distributed substantially at the front-rear middle position of the left needle shield surface 22, and the right inclined section 231 is distributed substantially at the front-rear middle position of the right needle shield surface 23. The left inclined section 221 and the right inclined section 231 make the change law of the working gap between the left needle protection surface 22 and the right needle protection surface 23: the front section has the same size and is a larger gap, the middle section has the same size and is a smaller gap, and the middle section gradually decreases from front to back and can continuously change.

Similarly, when the movable needle guard 90 is moved leftward by loosening the adjusting screw 110, the gap between the left needle guard surface 22 and the needle 40 in the left-right direction is made larger, which is suitable for the size of the needle 40 having a larger needle size (i.e., thicker). When the set screw 110 is loosened to move the movable needle guard 90 rightward, the gap between the left needle guard surface 22 and the needle 40 in the left-right direction becomes smaller, which is suitable for the size of the smaller needle size (i.e., finer) needle 40. When the rearward movement of the adjustment positioning plate 50 drives the shuttle frame 20 to rotate rearward by an angle, the gap between the left needle guard surface 22 and the needle 40 in the left-right direction becomes larger, which is suitable for the size of the larger needle size (i.e., thicker) needle 40. When the forward movement of the adjustment positioning plate 50 drives the shuttle frame 20 to rotate forward by an angle, the gap between the left needle guard surface 22 and the needle 40 in the left-right direction becomes smaller, which is suitable for the size of the smaller needle size (i.e., finer) needle 40.

In summary, the present utility model effectively overcomes the disadvantages of the prior art and has high industrial utility value.

The above embodiments are merely illustrative of the principles of the present utility model and its effectiveness, and are not intended to limit the utility model. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the utility model. Accordingly, it is intended that all equivalent modifications and variations of the utility model be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.

Claims (18)

1. The utility model provides a rotating shuttle with protect needle function, includes and offers shuttle frame (20) of needle fall groove (21), needle fall groove (21) extend, are arranged in allowing sewing machine middle needle (40) to wear to establish its characterized in that along the circumference of shuttle frame (20): along the axial direction of the rotating shuttle (10), the shuttle frame (20) is provided with a left needle protection surface (22) and a right needle protection surface (23) in the needle falling groove (21), and the left needle protection surface (22) and the right needle protection surface (23) are respectively distributed on the left side and the right side of the needle (40) in a close proximity mode.

2. The rotating shuttle with needle protection function according to claim 1, wherein: the left side groove wall surface part or the whole of the needle falling groove (21) forms a left needle protection surface (22), and the right side groove wall surface part or the whole of the needle falling groove (21) forms a right needle protection surface (23).

3. The rotating shuttle with needle protection function according to claim 1, wherein: the shuttle frame (20) further comprises a movable needle protection baffle (90), the movable needle protection baffle (90) is movably arranged on the shuttle frame (20) along the axial direction of the rotating shuttle (10), the right side groove wall surface of the needle falling groove (21) forms a right needle protection surface (23) partially or integrally, and the left needle protection surface (22) is fixedly arranged on the movable needle protection baffle (90).

4. A rotary hook with needle protection function according to claim 3, characterized in that: the movable needle protection baffle (90) comprises a baffle main body (91), a connecting part (92) and a needle protection plate part (93) which are connected in sequence in an integrated mode, an avoidance gap (94) allowing a needle falling groove (21) to be exposed is formed between the baffle main body (91), the connecting part (92) and the needle protection plate part (93), the baffle main body (91) is movably arranged on the shuttle frame (20), the needle protection plate part (93) is distributed on the left side of the needle (40), and the needle protection plate part (93) forms a left needle protection surface (22) towards the side surface part or the whole of the needle (40).

5. The rotating shuttle with needle protection function according to claim 4, wherein: the shuttle frame (20) further comprises an adjusting screw (110), a guide rail (29) which is in sliding fit with the baffle main body (91) is fixedly arranged on the outer peripheral surface of the shuttle frame (20), an adjusting groove (95) is formed in the baffle main body (91), the guide rail (29) and the adjusting groove (95) extend straight along the moving direction of the movable needle protection baffle (90), the baffle main body (91) and the shuttle frame (20) are fixed through the adjusting screw (110), and the adjusting screw (110) is arranged in the adjusting groove (95) in a penetrating mode.

6. The rotating shuttle with needle protection function according to claim 1, wherein: the left needle protection surface (22) and the right needle protection surface (23) are radial planes which extend straight along the radial direction of the shuttle frame (20).

7. A rotating shuttle with needle protection function according to any one of claims 1-3, characterized in that: at least one of the left needle protection surface (22) and the right needle protection surface (23) is provided with an inclined section (24), the inclined section (24) obliquely extends in the extending direction of the needle falling groove (21), and the inclined section (24) enables working gaps between the left needle protection surface (22) and the right needle protection surface (23) to have different axial widths.

8. The rotating shuttle with needle protection function according to claim 7, wherein: the left needle protection surface (22) and the right needle protection surface (23) are provided with the inclined section (24).

9. The rotating shuttle with needle protection function according to claim 8, wherein: the inclined section (24) of the left needle protection surface (22) is a left inclined section (221), and the inclined section (24) of the right needle protection surface (23) is a right inclined section (231); along the extending direction of needle falling groove (21), left needle protection face (22) still includes first left straight section (222) and the straight section (223) of second left who establishes respectively in left inclined section (221) both ends, right needle protection face (23) still includes first right straight section (232) and the straight section (233) of second right who establishes respectively in right inclined section (231) both ends, first left straight section (222), straight section (223) of second left, straight section (232) and straight section (233) of second right are all followed the straight extension of circumference of shuttle frame (20).

10. The rotating shuttle with needle protection function according to claim 9, wherein: the left inclined section (221) is inclined in the opposite direction to the right inclined section (231).

11. The rotating shuttle with needle protection function according to claim 9, wherein: the left inclined section (221) has an inclination angle greater than that of the right inclined section (231).

12. The rotating shuttle with needle protection function according to claim 7, wherein: the device also comprises a clearance adjusting assembly, wherein the clearance adjusting assembly is connected with the shuttle frame (20) and is used for driving the shuttle frame (20) to rotate around the axis of the shuttle frame.

13. The rotating shuttle with needle protection function according to claim 12, wherein: the clearance adjustment assembly comprises an adjustment positioning plate (50) which is movable along the radial direction of the shuttle frame (20), a positioning hook (51) is arranged on the adjustment positioning plate (50), an adjustment positioning groove (25) is formed in the outer edge side of the shuttle frame (20), and the positioning hook (51) is clamped with the adjustment positioning groove (25).

14. The rotating shuttle with needle protection function according to claim 13, wherein: the gap adjusting assembly further comprises a guide pin (60) which is fixedly arranged, a guide groove (52) which extends straight along the moving direction of the guide pin is formed in the adjusting and positioning plate (50), and the guide pin (60) is arranged in the guide groove (52) in a penetrating mode and is in sliding fit with the guide groove.

15. The rotating shuttle with needle protection function according to claim 13, wherein: the adjusting and positioning plate (50) is provided with scales (53), and the scales (53) are used for representing the size of a working gap between the left needle protection surface (22) and the right needle protection surface (23) at the position right below the needle (40).

16. The rotating shuttle with needle protection function according to claim 1, wherein: the outer ends of the left needle protection surface (22) and the right needle protection surface (23) are respectively provided with a chamfer part (26), and the chamfer parts (26) are arc surfaces or inclined surfaces.

17. The rotating shuttle with needle protection function according to claim 1, wherein: the clearance between the left needle protection surface (22) and the needle (40) in the axial direction of the rotating shuttle (10) is 0.15 plus or minus 0.15mm, and the clearance between the right needle protection surface (23) and the needle (40) in the axial direction of the rotating shuttle (10) is 0.15 plus or minus 0.15mm.

18. A sewing machine, characterized in that: the sewing machine is equipped with a rotating shuttle (10) according to any one of claims 1-17.