CN214244839U

CN214244839U - Chain stitch rotating shuttle mechanism

Info

Publication number: CN214244839U
Application number: CN202120158911.2U
Authority: CN
Inventors: 张春木; 洪鹏; 游鲁浙; 郭士力
Original assignee: Zhejiang Nicerbt Electromechanical Technology Co ltd
Current assignee: Zhejiang Nicerbt Electromechanical Technology Co ltd
Priority date: 2021-01-19
Filing date: 2021-01-19
Publication date: 2021-09-21
Anticipated expiration: 2031-01-19

Abstract

The utility model belongs to the technical field of sewing machine, refer in particular to a chain stitch seam rotating shuttle mechanism, including rotating the base, rotating the base on be provided with the main shaft and looper subassembly and dial the line subassembly, the last line ball support that is provided with of rotating the base, the last rotation cover of line ball support is equipped with the line section of thick bamboo that the winding has the bottom line, the front end rigid cover of main shaft has the line cam of sending, rear end and driving source transmission to be connected, the outer end of bottom line supports on the cam surface that sends the line cam through crossing the line subassembly, and the outer end tip of bottom line sets up on the looper subassembly. The utility model discloses the bottom line twines on a thread section of thick bamboo to on its outer end supports the cam surface that send the line cam, drive respectively by the main shaft and send the line cam to rotate, the looper of looper subassembly does circumference reciprocating swing and dial the line bedplate of dialling of line subassembly and do reciprocating sliding all around, make and remain the straight line state of sending of straining all the time at looper reciprocating swing in-process bottom line, can sew up smooth-going chain stitch seam, ensure to possess better the quality of making up.

Description

Chain stitch rotating shuttle mechanism

The technical field is as follows:

the utility model belongs to the technical field of sewing machine, refer in particular to a chain stitch seam rotating shuttle mechanism.

Background art:

the conventional stitches used for sewing the bottoms of trousers at present are lock stitches and chain stitches, wherein the lock stitches require a rotating shuttle to continuously rotate in cooperation with a machine needle to move, and the chain stitches require a curved needle to reciprocate to swing in cooperation with the machine needle to move so as to form the required stitches. Therefore, the rotating shuttle and the curved needle need to be driven by different actuating mechanisms.

The rumble foot machine that trivia and chain stitch exchange that the existing chinese utility model patent (the grant publication number is CN206887418U) discloses, it includes: the wire drawing mechanism comprises an upper main shaft, a motor for driving the upper main shaft to rotate, an upper synchronizing wheel fixed on the upper main shaft, a synchronous belt connected with the upper synchronizing wheel, a lower synchronizing wheel rotating under the driving of the synchronous belt and a lower main shaft rotating under the driving of the lower synchronizing wheel, wherein a wire drawing transmission eccentric wheel, a rotating shuttle large gear and a curved needle eccentric wheel which rotate along with the lower main shaft are fixed on the lower main shaft, the wire drawing transmission eccentric wheel drives a cross shaft to swing, the cross shaft drives a wire bonding rod seat and a wire drawing crank to swing, the wire drawing crank drives a wire drawing shaft seat to move left and right through a pin, the wire drawing shaft seat drives a wire drawing shaft fixed on the wire drawing shaft seat to move left and right, and the wire drawing shaft drives a wire drawing rod seat fixed on the wire drawing shaft and a wire drawing rod fixed on the wire drawing rod seat to move left and right. In the structure, the upper main shaft is driven by the motor to drive the lower main shaft to rotate through the synchronous belt, and then the wire pulling transmission eccentric wheel and the curved needle eccentric wheel are driven to rotate synchronously, so that the wire pulling rod moves left and right and the curved needle swings back and forth.

The bobbin thread is wound on the shuttle and is rotated by the rotating shuttle to be matched with the curved needle for feeding the thread, but in the actual use process, the bobbin thread needs to be frequently replaced due to the limited length of the bobbin thread wound on the shuttle; meanwhile, the reciprocating swing of the curved needle enables the bottom thread to be loosened when the bottom thread is fed at a certain speed, so that the stitches are not smooth, and the sewing quality is seriously influenced.

The invention content is as follows:

the utility model aims at providing a chain stitch seam rotating shuttle mechanism, its bottom line can keep the straight thread feeding state that stretches tight all the time in the reciprocal swing of looper, can sew up smooth-going chain stitch seam, ensures to possess better the quality of making up.

The utility model discloses a realize like this:

the utility model provides a chain stitch seam rotating shuttle mechanism, is provided with the main shaft on the rotating base and the looper subassembly and the group line subassembly of being connected with spindle drive, be provided with the line ball support on the rotating base, rotate the cover on the line ball support and be equipped with the bobbin that the winding has the bottom line, the front end rigid coupling of main shaft has the line cam of sending, rear end and driving source transmission to be connected, and the outer end of bottom line supports on the cam surface of sending the line cam through crossing the line subassembly and the outer end tip of bottom line sets up on the looper subassembly, drives the main shaft by the driving source and drives and send the line cam to rotate.

In foretell chain stitch seam rotating shuttle mechanism, the looper subassembly is including rotating the looper axle of connecting on rotating base, and the front end of looper axle is provided with the looper, rear end and the one end fixed connection of looper crank, and the other end of looper crank is articulated with the one end of looper connecting rod, the solid cover has the looper eccentric wheel of eccentric settings on the main shaft, and the other end cover of looper connecting rod is established on the looper eccentric wheel.

In the chain stitch rotating shuttle mechanism, the thread shifting assembly comprises a thread shifting rod which slides back and forth on the rotating base and a thread shifting cross shaft which transversely rotates on the rotating base, the front end of the thread shifting rod is provided with a thread shifting seat plate, the rear end of the thread shifting rod is rotatably connected with a pin shaft, a shaft handle is fixedly sleeved on the thread shifting cross shaft, the outer end of the shaft handle penetrates through and is slidably connected to the pin shaft, the main shaft is fixedly sleeved with an eccentrically arranged thread shifting eccentric wheel, one end of the thread shifting connecting rod is sleeved on the thread shifting eccentric wheel, and the other end of the thread shifting connecting rod is provided with a plug pin which penetrates through and is slidably connected to the thread shifting cross shaft through a ball bearing.

In the above-mentioned chain stitch rotating shuttle mechanism, the thread passing assembly comprises a thread bonding plate arranged on the rotating base, the thread bonding plate is positioned at the front side or/and the rear side of the thread feeding cam, and a thread passing hole for a bottom thread to pass through is arranged on the thread bonding plate.

In the above chain stitch rotating shuttle mechanism, the thread feeding cam includes a sleeve portion sleeved on the main shaft and a cam portion arranged on the sleeve portion, an open slot for the cam portion to rotate is formed on the thread take-up plate, thread passing support plates are arranged on the thread take-up plates located at the front and rear sides of the cam portion, and the thread passing holes are formed in the thread passing support plates.

In the chain stitch rotating shuttle mechanism, the middle part of the cam part is provided with an annular groove, the thread passing plate is fixed on the thread beating plate, the outer end of the thread passing plate is positioned in the annular groove, and the thread passing plate is provided with a thread passing strip-shaped hole along the length direction thereof for a bottom thread to pass through.

In the chain stitch rotating shuttle mechanism, the rotating base is fixed with a mounting seat, the routing plate is rotationally connected to the mounting seat through a first axial screw, a first elastic part is arranged between the routing plate and the mounting seat, the routing plate rotates towards the direction far away from the wire feeding cam under the elastic force of the first elastic part, the routing plate is provided with a moving column, the mounting seat which is positioned on the moving column towards the direction far away from the wire feeding cam is provided with a limiting column corresponding to the position of the moving column, the mounting seat which is positioned on the moving column towards the direction close to the wire feeding cam is rotationally connected with a wire inlet handle through a second axial screw, one end of the wire inlet handle is positioned between the mounting seat and the routing plate, and a clamping groove corresponding to the position of the movable column is formed, an elastic part II is arranged between the wire inlet handle and the mounting seat, and the wire inlet handle drives the clamping groove to be clamped with the movable column under the elastic force of the elastic part II.

In the chain stitch rotating shuttle mechanism, the rotating base is provided with the wire clamp assembly, and the outer end of the bottom wire sequentially passes through the wire clamp assembly, one of the wire passing holes, the wire passing strip hole and the other wire passing hole from inside to outside.

In the chain stitch rotating shuttle mechanism, the thread passing support plate is provided with an adjusting strip-shaped hole, and the thread passing support plate penetrates through the adjusting strip-shaped hole through the fastener and is fixed on the thread beating plate.

In the chain stitch rotating shuttle mechanism, the rotating base is provided with the thread pulling cylinder, and the telescopic end of the thread pulling cylinder is provided with the thread passing hook hole for the outer end of the bottom thread to pass through.

Compared with the prior art, the utility model outstanding advantage is:

the utility model discloses the bottom line twines on a thread section of thick bamboo to on its outer end supports the cam surface that send the line cam, drive respectively by the main shaft and send the line cam to rotate, the looper of looper subassembly does circumference reciprocating swing and dial the line bedplate of dialling of line subassembly and do reciprocating sliding all around, make and remain the straight line state of sending of straining all the time at looper reciprocating swing in-process bottom line, can sew up smooth-going chain stitch seam, ensure to possess better the quality of making up.

Description of the drawings:

FIG. 1 is a perspective view of the overall structure of the present invention;

FIG. 2 is a perspective view of the main shaft and looper assembly and thread pulling assembly of the present invention;

FIG. 3 is a perspective view of the wire passing assembly of the present invention;

fig. 4 is a perspective view of the incoming line handle of the present invention;

fig. 5 is a perspective view of the wire bonding plate of the present invention.

In the figure: 1. rotating the base; 2. a main shaft; 3. a coil support; 4. a bobbin; 5. a wire feeding cam; 6. a drive motor; 7. a driving synchronizing wheel; 8. a driven synchronizing wheel; 9. a synchronous belt; 10. a curved needle shaft; 11. bending a needle; 12. a curved needle crank; 13. a curved needle connecting rod; 14. a curved needle eccentric wheel; 15. a wire poking rod; 16. a line-shifting cross shaft; 17. a wire shifting seat plate; 18. a pin shaft; 19. a mandrel; 20. a wire-pulling eccentric wheel; 21. a plug pin; 22. wiring board beating; 23. a wire passing hole; 24. a sleeve portion; 25. a cam portion; 26. an open slot; 27. a wire passing support plate; 28. an annular groove; 29. a wire passing plate; 30. a threading bar-shaped hole; 31. a mounting seat; 32. a first elastic part; 33. moving the column; 34. a wire inlet handle; 35. a card slot; 36. a second elastic piece; 37. a wire clamp assembly; 38. adjusting the strip-shaped holes; 39. a wire shifting cylinder; 40. and a wire passing hook hole.

The specific implementation mode is as follows:

the invention will now be further described with reference to specific embodiments, with reference to figures 1 to 5:

the utility model provides a chain stitch seam rotating shuttle mechanism, is provided with main shaft 2 and the looper subassembly of being connected with main shaft 2 transmission and dials the line subassembly including rotating base 1 on rotating base 1, be provided with line ball support 3 on rotating base 1, rotate the cover on the line ball support 3 and be equipped with the bobbin 4 that the winding has the bottom line, the front end rigid coupling of main shaft 2 has send line cam 5, rear end and driving source transmission to be connected, and the outer end of bottom line supports on the cam surface that send line cam 5 through crossing the line subassembly, and the outer end tip of bottom line sets up on the looper subassembly, drives send line cam 5 to rotate by driving source drive main shaft 2. In this embodiment, the driving source adopts a driving motor 6, a driving synchronizing wheel 7 is sleeved on an output shaft of the driving motor 6, a driven synchronizing wheel 8 is sleeved on the main shaft 2, and the driving synchronizing wheel 7 is in transmission connection with the driven synchronizing wheel 8 through a synchronous belt 9. Of course, gear engagement transmission can also be adopted between the driving motor 6 and the main shaft 2.

The utility model discloses the bottom line twines on a thread section of thick bamboo 4 to its outer end supports on sending the cam surface of line cam 5, drive respectively by main shaft 2 and send line cam 5 to rotate, the looper 11 of looper subassembly does circumference reciprocating swing and dial the line bedplate 17 of dialling of line subassembly and do reciprocating sliding all around, make and keep the straight line state of sending of stretching over all the time at looper 11 reciprocating swing in-process bottom line, can sew up smooth-going chain stitch seam, ensure to possess better the quality of making up.

Furthermore, the looper assembly may adopt a structure commonly found in the market, and in this embodiment, the specific structure of the looper assembly is: the looper subassembly is including rotating the looper axle 10 of connecting on rotating base 1, and the front end of looper axle 10 is provided with looper 11, rear end and looper crank 12's one end fixed connection, and the other end of looper crank 12 is articulated with the one end of looper connecting rod 13, the solid cover has the looper eccentric wheel 14 of eccentric setting on main shaft 2, and the other end cover of looper connecting rod 13 is established on looper eccentric wheel 14. Namely, the main shaft 2 rotates to drive the looper eccentric wheel 14 to rotate, and then the looper shaft 10 and the looper 11 are driven to do reciprocating swing through the looper connecting rod 13.

Moreover, the wire-pulling component can adopt a structure which is common in the market, and in the embodiment, the specific structure of the wire-pulling component is as follows: the wire shifting assembly comprises a wire shifting rod 15 and a wire shifting cross shaft 16, wherein the wire shifting rod 15 slides back and forth on the rotating base 1, the wire shifting cross shaft 16 transversely rotates on the rotating base 1, a wire shifting seat plate 17 is arranged at the front end of the wire shifting rod 15, a pin shaft 18 is rotatably connected to the rear end of the wire shifting rod, a shaft handle 19 is fixedly sleeved on the wire shifting cross shaft 16, the outer end of the shaft handle 19 penetrates through and is slidably connected to the pin shaft 18, an eccentrically arranged wire shifting eccentric wheel 20 is fixedly sleeved on the main shaft 2, one end of a wire shifting connecting rod is sleeved on the wire shifting eccentric wheel 20, and the other end of the wire shifting connecting rod is provided with an inserting pin 21 which penetrates through and is slidably connected to the wire shifting cross shaft 16 through a ball bearing. That is, the main shaft 2 drives the wire-pulling eccentric wheel 20 to rotate, and drives the wire-pulling cross shaft 16 to circumferentially swing through the wire-pulling connecting rod and the inserting pin 21, and further drives the wire-pulling rod 15 and the wire-pulling seat plate to slide back and forth through the shaft pin of the shaft handle 19 and the pin shaft 18.

Furthermore, in order to enable the outer end of the bottom thread to abut against the cam surface of the thread feeding cam 5, the thread passing assembly has the following specific structure: the wire passing assembly comprises a wire bonding plate 22 arranged on the rotary base 1, the wire bonding plate 22 is positioned on the front side or/and the rear side of the wire feeding cam 5, and a wire passing hole 23 for a bottom wire to pass through is formed in the wire bonding plate 22. Namely, the thread through hole 23 plays a role in positioning the bobbin thread so that the bobbin thread passes through the front side or/and the rear side of the feeding cam to ensure that the bobbin thread always collides with the cam surface of the feeding cam.

And simultaneously, in order to improve the utility model discloses a pay-off stability, send line cam 5 including the cover be equipped with on main shaft 2 sleeve portion 24 and set up the cam portion 25 on sleeve portion 24, set up on the line beating board 22 and supply cam portion 25 pivoted open slot 26, be located before cam portion 25, all be provided with on the line beating board 22 of back both sides and cross line extension board 27, cross line hole 23 and set up on crossing line extension board 27. Since the thread-passing brackets 27 are disposed on both the front and rear sides of the cam portion 25, the bobbin thread sequentially passes through the thread-passing holes 23 of the two thread-passing brackets 27, so as to further ensure that the bobbin thread abuts against the cam surface of the cam portion 25. Meanwhile, since the wire bonding plate 22 of the present invention is rotatably connected to the rotating base 1, the bottom surface of the wire bonding plate 22 always abuts against the outer surface of the sleeve portion 24 in order to ensure that the cam portion 25 rotates in the opening groove 26.

In this embodiment, an annular groove 28 is formed in the middle of the cam portion 25, a thread passing plate 29 is fixed on the thread applying plate 22, the outer end of the thread passing plate 29 is located in the annular groove 28, and a thread passing strip-shaped hole 30 through which a bottom thread passes is formed in the thread passing plate 29 along the length direction of the thread passing plate. The bottom thread passes through one of the thread passing holes 23, the thread passing strip-shaped hole 30 and the other thread passing hole 23 in sequence, and meanwhile, in the rotating process of the cam part 25, the bottom thread can move along the thread passing strip-shaped hole 30 along with the cam surface of the cam part 25.

In addition, in order to facilitate the installation of the bottom line on the wiring board 22, the rotating base 1 is fixed with a mounting seat 31, the wiring board 22 is rotatably connected to the mounting seat 31 through a first axial screw, a first elastic element 32 is arranged between the wiring board 22 and the mounting seat 31, the wiring board 22 rotates towards the direction far away from the line feeding cam 5 under the elastic force of the first elastic element 32, a moving column 33 is arranged on the wiring board 22, a limiting column corresponding to the position of the moving column 33 is arranged on the mounting seat 31, which is positioned towards the direction far away from the line feeding cam 5, of the moving column 33, a line inlet handle 34 is rotatably connected to the mounting seat 31, which is positioned towards the direction close to the line feeding cam 5, through a second axial screw, one end of the line inlet handle 34 is positioned between the mounting seat 31 and the wiring board 22 and is provided with a clamping groove 35 corresponding to the position of the moving column 33, and a second elastic element 36 is arranged between the line inlet handle 34 and the mounting seat 31, And the wire inlet handle 34 drives the clamping groove 35 to be clamped with the movable column 33 under the elastic force of the second elastic piece 36. In order to facilitate the installation of the bobbin thread into the thread passing hole 23 and the thread passing strip-shaped hole 30 of the thread beating plate 22, the thread beating plate 22 rotates towards the direction far away from the thread feeding cam 5 under the action of the elastic force of the first elastic piece 32 until the moving column 33 is abutted against the limiting column by pressing the thread inlet handle 34 downwards to overcome the elastic force of the second elastic piece 36 so as to separate the moving column 33 from the clamping groove 35, and thus sufficient operating space is reserved for the threading of the bobbin thread; and when the bottom line is threaded into the line passing hole 23 and the line passing strip-shaped hole 30, the line beating plate 22 is rotated towards the direction close to the line feeding cam 5 by pressing the line beating plate 22, and the moving column 33 is clamped in the clamping groove 35 by pressing the line feeding handle 34, so that the bottom line is loaded.

In addition, in order to plan a line feeding route of the bottom line on the rotary bottom line, so that the bottom line can smoothly pass through one of the line passing holes 23 and pass out from the other line passing hole 23 to the looper assembly, the rotary base 1 is provided with a line clamp assembly 37, and the outer end of the bottom line sequentially passes through the line clamp assembly 37, one of the line passing holes 23, the line passing strip hole 30 and the other line passing hole 23 from inside to outside.

Meanwhile, in order to adjust the abutting angle between the bottom line and the cam surface of the feeding cam, an adjusting strip-shaped hole 38 is formed in the line passing support plate 27, and the line passing support plate 27 penetrates through the adjusting strip-shaped hole 38 through a fastening piece to be fixed on the line beating plate 22.

In addition, in order to ensure that the bobbin thread can keep a stretched state, the rotating base 1 is provided with a thread pulling cylinder 39, and a thread passing hook hole 40 for the outer end of the bobbin thread to pass through is arranged at the telescopic end of the thread pulling cylinder 39, namely, the bobbin thread can always keep the stretched state by controlling the telescopic movement of the thread pulling cylinder 39.

The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so: all equivalent changes made according to the shape, structure and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a chain stitch seam rotating shuttle mechanism, is provided with main shaft (2) and the looper subassembly of being connected with main shaft (2) transmission and group line subassembly, its characterized in that including rotating base (1) on rotating base (1): be provided with line ball support (3) on rotating base (1), the cover is rotated on line ball support (3) and is equipped with line section of thick bamboo (4) that the winding has the bottom wire, the front end rigid cover of main shaft (2) has send line cam (5), rear end and driving source transmission to be connected, and the outer end of bottom wire supports through crossing the line subassembly and leans on the cam surface that sends line cam (5), and the outer end tip of bottom wire sets up on the looper subassembly, drives by driving source drive main shaft (2) and send line cam (5) to rotate.

2. A chain stitch rotary shuttle mechanism as claimed in claim 1, wherein: the looper subassembly is including rotating looper axle (10) of connecting on rotating base (1), and the front end of looper axle (10) is provided with the one end fixed connection of looper (11), rear end and looper crank (12), and the other end of looper crank (12) is articulated with the one end of looper connecting rod (13), the solid cover has the looper eccentric wheel (14) of eccentric setting on main shaft (2), and the other pot head of looper connecting rod (13) is established on looper eccentric wheel (14).

3. A chain stitch rotary shuttle mechanism as claimed in claim 1, wherein: the wire shifting assembly comprises a wire shifting rod (15) which slides on a rotating base (1) from front to back and a wire shifting transverse shaft (16) which transversely rotates on the rotating base (1), a wire shifting base plate (17) is arranged at the front end of the wire shifting rod (15), a pin shaft (18) is rotatably connected at the rear end of the wire shifting rod, a shaft handle (19) is fixedly sleeved on the wire shifting transverse shaft (16), the outer end of the shaft handle (19) penetrates through and is slidably connected onto the pin shaft (18), an eccentrically-arranged wire shifting eccentric wheel (20) is fixedly sleeved on a main shaft (2), one end of a wire shifting connecting rod is sleeved on the wire shifting eccentric wheel (20), and the other end of the wire shifting connecting rod is provided with an inserting pin (21) which penetrates through and is slidably connected onto the wire shifting transverse shaft (16) through a ball bearing.

4. A chain stitch rotary shuttle mechanism as claimed in claim 1, wherein: the wire passing assembly comprises a wire bonding plate (22) arranged on the rotary base (1), the wire bonding plate (22) is positioned on the front side or/and the rear side of the wire feeding cam (5), and a wire passing hole (23) for a bottom wire to pass through is formed in the wire bonding plate (22).

5. A chain stitch rotary shuttle mechanism as claimed in claim 4, wherein: the wire feeding cam (5) comprises a sleeve portion (24) sleeved on the main shaft (2) and a cam portion (25) arranged on the sleeve portion (24), an opening groove (26) for the cam portion (25) to rotate is formed in the wire beating plate (22), wire passing support plates (27) are arranged on the wire beating plate (22) located on the front side and the rear side of the cam portion (25), and the wire passing holes (23) are formed in the wire passing support plates (27).

6. A chain stitch rotary shuttle mechanism as claimed in claim 5, wherein: an annular groove (28) is formed in the middle of the cam portion (25), a thread passing plate (29) is fixed on the thread beating plate (22), the outer end of the thread passing plate (29) is located in the annular groove (28), and a thread passing strip-shaped hole (30) for a bottom thread to pass through is formed in the thread passing plate (29) along the length direction of the thread passing plate.

7. A chain stitch rotary shuttle mechanism as claimed in claim 4, wherein: a mounting seat (31) is fixed on the rotary base (1), the wiring board (22) is rotatably connected to the mounting seat (31) through a first axial screw, a first elastic part (32) is arranged between the wiring board (22) and the mounting seat (31), the wiring board (22) rotates towards the direction far away from the wire feeding cam (5) under the elastic force of the first elastic part (32), a moving column (33) is arranged on the wiring board (22), a limiting column corresponding to the moving column (33) is arranged on the mounting seat (31) towards the direction far away from the wire feeding cam (5) positioned on the moving column (33), a wire inlet handle (34) is rotatably connected to the mounting seat (31) towards the direction close to the wire feeding cam (5) through a second axial screw, one end of the wire inlet handle (34) is positioned between the mounting seat (31) and the wiring board (22) and is provided with a clamping groove (35) corresponding to the position of the moving column (33), an elastic part II (36) is arranged between the wire inlet handle (34) and the mounting seat (31), and the wire inlet handle (34) drives the clamping groove (35) to be clamped with the movable column (33) under the elastic force of the elastic part II (36).

8. A chain stitch rotary shuttle mechanism as claimed in claim 6, wherein: the rotating base (1) is provided with a wire clamp assembly (37), and the outer end of the bottom wire sequentially passes through the wire clamp assembly (37), one wire passing hole (23), the wire passing strip-shaped hole (30) and the other wire passing hole (23) from inside to outside.

9. A chain stitch rotary shuttle mechanism as claimed in claim 5, wherein: the thread passing support plate (27) is provided with an adjusting strip-shaped hole (38), and the thread passing support plate (27) penetrates through the adjusting strip-shaped hole (38) through a fastener to be fixed on the thread beating plate (22).

10. A chain stitch rotary shuttle mechanism as claimed in claim 1, wherein: the rotary base (1) is provided with a thread shifting cylinder (39), and the telescopic end of the thread shifting cylinder (39) is provided with a thread passing hook hole (40) for the outer end of the bottom thread to pass through.