A sewing machine

Abstract

The sewing machine comprises a sewing machine body, the sewing machine body is provided with a machine base, a sewing machine head and a rotating shuttle assembly, the machine base is provided with an extension arm, the sewing machine body is provided with a front section main shaft, a rear section main shaft, a front section auxiliary shaft and a rear section auxiliary shaft, the front end of the rear section main shaft is drivingly connected to the rear end of the front section main shaft through a first synchronous belt transmission device, the front end of the rear section auxiliary shaft is drivingly connected to the rear end of the front section auxiliary shaft through a second synchronous belt transmission device, and the end of the extension arm away from the machine base is provided with a bent piece, the bent piece comprises a first connecting part and a second connecting part, and a clearance is formed between the machine base, the extension arm and the first connecting part; thus, compared with the matching mode of the protrusion and the groove, the sewing work is free of sliding, has an accurate transmission ratio, high transmission efficiency, ensures uniform sewing pitch and good consistency of sewing quality, makes the working process of the sewing machine head more stable, and the buffering effect is more soft.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of sewing machine technology, in particular to a sewing machine. BACKGROUND

[0002] The luggage sewing machine is one of the most commonly used sewing machines for making luggage, which can also be called an industrial flat sewing machine. It can be used to sew the fabric, lining and other details of luggage, and has the advantages of fast speed, uniform sewing line and convenient control of thread tension.

[0003] The prior art discloses a synchronous belt transmission sewing machine, which comprises a main shaft, a machine head, a tooth rack and a driving motor. The lower part of the machine head is provided with a sewing mechanism, the main shaft is arranged between the machine head and the driving motor, and the driving motor drives the main shaft to rotate to drive the sewing mechanism to work. The lower part of the machine head is provided with a tooth rack, and a gap is arranged between the machine head and the tooth rack to place the cloth. The main shaft comprises a front section main shaft and a rear section main shaft. The front section main shaft is connected with the machine head, and the rear section main shaft is rotatably connected with the driving motor. The end part of the front section main shaft connected with the rear section main shaft is provided with a first connecting assembly, and the end part of the rear section main shaft connected with the front section main shaft is provided with a second connecting assembly. The first connecting assembly and the second connecting assembly can slide relative to each other in the vertical direction to separate or connect with each other. When the sewing machine does not work, the machine head moves upward along the vertical direction to move away from the tooth rack, so that the first connecting assembly and the second connecting assembly are separated from each other. When the sewing machine works, the machine head moves downward along the vertical direction, so that the first connecting assembly and the second connecting assembly are connected with each other, the driving motor drives the rear section main shaft to rotate, thereby driving the front section main shaft to rotate to drive the sewing mechanism to work, so as to sew the cloth. The sewing mechanism under the machine head can be lifted to a large height, so that fluffy cloth or thick cloth can be sewn. However, the synchronous belt transmission sewing machine has the following defects:

[0004] For example, the first connecting assembly and the second connecting assembly are two parts of a shaft coupling. One connecting assembly is provided with a groove, and the other connecting assembly is provided with a protrusion. When the sewing machine does not work, the machine head moves upward along the vertical direction to move away from the tooth rack, so that the first connecting assembly and the second connecting assembly are separated from each other. By using the cooperation mode of the protrusion and the groove, high-precision mechanical processing must be performed on the connecting surfaces of the first connecting assembly and the second connecting assembly, otherwise the two connecting assemblies cannot be used in cooperation.

[0005] Secondly, when the machine head and the front section main shaft slide relative to the rear section main shaft and the driving motor in the vertical direction, the first connecting assembly and the second connecting assembly can be separated from each other, so that the sewing mechanism under the machine head can be lifted to a large height. However, this will cause the protrusion to be unable to be clamped in the groove during the sewing work, so that the driving force of the driving motor driving the rear section main shaft to rotate cannot be fully transmitted to the front section main shaft, thereby affecting the work of the sewing mechanism and reducing the product qualification rate of the sewing machine.

[0006] Therefore, there is a need to study a new technical solution to solve the above problems. SUMMARY

[0007] Therefore, there is a need to study a new technical solution to solve the above problems.

[0008] To achieve the above object, the present application adopts the following technical solution:

[0009] A sewing machine, comprising a sewing machine body, the sewing machine body having a machine base, a sewing machine head, and a rotating shuttle assembly, the machine base being provided with a lifting drive device, the lifting drive device driving the sewing machine head to lift to adjust the height of the sewing machine head; the sewing machine body being provided with a front main shaft, a rear main shaft, a front auxiliary shaft, a rear auxiliary shaft, and a main shaft drive device driving the rear main shaft to rotate; the front main shaft being drivingly connected to the front auxiliary shaft;

[0010] The front main shaft and the front auxiliary shaft are arranged on the sewing machine head; the front end of the rear main shaft is drivingly connected to the rear end of the front main shaft through a first synchronous belt drive device; the front end of the rear auxiliary shaft is drivingly connected to the rear end of the front auxiliary shaft through a second synchronous belt drive device;

[0011] The first synchronous belt drive device and the second synchronous belt drive device each comprise a first movable shell, a second movable shell, a first synchronous belt, a linkage synchronous wheel, a second synchronous belt, a first synchronous wheel arranged at the front end of the corresponding rear main shaft or rear auxiliary shaft, and a second synchronous wheel arranged at the rear end of the corresponding front main shaft or front auxiliary shaft; the linkage synchronous wheel is provided with a first linkage wheel and a second linkage wheel, the first synchronous belt is drivingly connected between the first synchronous wheel and the first linkage wheel, and the first movable shell is movably sleeved outside the first synchronous wheel, the first synchronous belt, and the first linkage wheel; the second synchronous belt is drivingly connected between the second synchronous wheel and the second linkage wheel, and the second movable shell is movably sleeved outside the second synchronous wheel, the second synchronous belt, and the second linkage wheel;

[0012] When the lifting drive device drives the sewing machine head to rise, the front main shaft and the front auxiliary shaft rise together with the sewing machine head, the second synchronous wheel pulls the linkage synchronous wheel to rotate upward around the first synchronous wheel through the second synchronous belt, so that the second movable shell is arranged at an angle with the first movable shell;

[0013] When the lifting driving device drives the sewing head to descend, the front main shaft and the front auxiliary shaft descend with the sewing head, the linkage synchronous wheel rotates downward around the first synchronous wheel, so that the second movable shell is arranged in alignment with the first movable shell;

[0014] The extension arm is further provided on the machine base, and a transmission shaft is arranged in the extension arm. An elbow part is arranged at the end of the extension arm away from the machine base. The elbow part comprises a first connecting part arranged in the vertical direction of the machine base and a second connecting part arranged in the transverse direction of the extension of the first connecting part. The second connecting part is arranged in the length direction of the extension arm. The rotating hook assembly is arranged on the second connecting part. The transmission shaft is connected to the rotating hook assembly through a linkage assembly. The sewing head and the rotating hook assembly form a processing position therebetween. The machine base, the extension arm and the first connecting part form an avoiding position therebetween for providing an avoiding space for a product to be sewn.

[0015] As a preferred solution, the linkage synchronous wheel further comprises a rotating part, a first synchronous belt tensioning plate, a second synchronous belt tensioning plate, a transmission shaft, a first bearing and a second bearing. The first linkage wheel and the second linkage wheel are arranged at the front and rear ends of the rotating part respectively. The rotating part is sleeved on the transmission shaft. The first bearing and the second bearing are arranged at the front and rear ends of the transmission shaft respectively. The first bearing is connected to the first synchronous belt tensioning plate in transmission. The second bearing is connected to the second synchronous belt tensioning plate in transmission.

[0016] As a preferred solution, the rear main shaft is connected to the rear auxiliary shaft in transmission through a connecting part, so that the power of the rear main shaft is transmitted to the rear auxiliary shaft, and the rear main shaft and the rear auxiliary shaft drive the synchronous belt transmission device to drive the sewing head to move up and down synchronously.

[0017] As a preferred solution, a cross beam is further arranged above the extension arm on the machine base. The first connecting part is arranged upward from the right end of the extension arm. An avoiding position is formed among the lower end surface of the cross beam, the upper end surface of the extension arm and the left end surface of the first connecting part. The second connecting part is arranged rightward from the upper end of the first connecting part. An arrangement position is formed among the upper end surface of the first connecting part and the upper end surface of the second connecting part.

[0018] As a preferred solution, the transmission shaft comprises a lifting pin shaft and a feeding shaft. One end of the lifting pin shaft and the feeding shaft is connected to the rotating hook assembly in transmission through a linkage assembly. The linkage assembly is arranged in the extension direction of the first connecting part and in the first connecting part.

[0019] The rotating hook assembly comprises a rotating hook, a first connecting shaft and a second connecting shaft connected to the rotating hook; the linkage assembly comprises a third synchronous wheel, a fourth synchronous wheel, a third synchronous belt and a feeding mechanism; the third synchronous wheel is connected to the other end of the lifting tooth shaft, and the fourth synchronous wheel is located above the third synchronous wheel; the fourth synchronous wheel is arranged on the first connecting shaft, and the third synchronous wheel is connected to the fourth synchronous wheel through the third synchronous belt;

[0020] The feeding mechanism comprises a first feeding pull rod and a second feeding pull rod; the first feeding pull rod is rotatably connected to the other end of the feeding shaft; the second feeding pull rod is arranged upward from the other end of the first feeding pull rod; the other end of the second feeding pull rod is drivingly connected to the second connecting shaft.

[0021] As a preferred solution, the first connecting part is arranged downward from the right side of the extension arm, and an avoiding position is formed between the right end surface of the machine base, the lower end surface of the extension arm and the left end surface of the first connecting part.

[0022] As a preferred solution, the second connecting part is arranged rightward from the lower end of the first connecting part, wherein an accommodating position is formed between the right end surface of the first connecting part and the upper end surface of the second connecting part.

[0023] As a preferred solution, the left end of the lifting tooth shaft and the feeding shaft is further provided with a synchronous belt transmission assembly, the synchronous belt transmission assembly is provided with a third connecting shaft, a fourth connecting shaft, a fifth synchronous wheel, a sixth synchronous wheel and a fourth synchronous belt, the fifth synchronous wheel is arranged on one end of the lifting tooth shaft, the sixth synchronous wheel is arranged on one end of the third connecting shaft, and the fifth synchronous wheel is drivingly connected to the sixth synchronous wheel through the fourth synchronous belt; the feeding shaft is drivingly connected to one end of the fourth connecting shaft through a linkage rod;

[0024] The fourth synchronous wheel is located below the third synchronous wheel; the fourth synchronous wheel is arranged on the first connecting shaft, and the third synchronous wheel is connected to the fourth synchronous wheel through the first synchronous belt.

[0025] The second feeding pull rod is arranged downward from the other end of the first feeding pull rod; the other end of the second feeding pull rod is drivingly connected to the second connecting shaft.

[0026] As a preferred solution, the upper beam is provided with an upper front connecting arm and an upper front extension shell, and the sewing machine head is arranged in the upper front extension shell; the upper connecting arm is provided with a mounting bracket and a pressing piece; one end of the pressing piece is connected to the output end of the lifting driving device, and the other end of the pressing piece is connected to the upper front extension shell; the lifting driving device drives the pressing piece to lift and lower to adjust the height of the sewing machine head.

[0027] The front side of the mounting frame is provided with a guide rail; and the upper end surface of the upper front extension shell is provided with a cross connecting groove;

[0028] The rear end of the lower pressing piece is connected to the mounting frame through a connecting frame, the rear side of the connecting frame is provided with a sliding block for adapting to the guide rail, the sliding block is connected to the guide rail and can slide up and down along the guide rail, the lower end surface of the connecting frame is provided with a cross connecting part for connecting to the cross connecting groove, the upper end of the connecting frame is connected to the upper front extension shell, and the cross connecting part is matched with the cross connecting groove.

[0029] As a preferred solution, the side of the sewing machine head is further provided with a thread tensioning assembly, the thread tensioning assembly is connected with a needle rod, the lower end of the needle rod is provided with a sewing needle for adapting to the rotating shuttle; the thread tensioning assembly comprises a head crank mounted at one end of the front main shaft, a needle rod connecting crank arranged on the head crank, a thread tensioning rod sleeved on the needle rod connecting crank, and a connecting rod connected with the needle rod connecting crank, the needle rod is rotatably connected with the connecting rod through an iron rod clamp; the head crank is connected to the front end of the front main shaft.

[0030] Compared with the prior art, the present application has obvious advantages and beneficial effects, specifically, from the above technical solution, it is mainly through the structural design of the first synchronous belt transmission device and the second synchronous belt transmission device, the front end of the rear main shaft is drivingly connected to the rear end of the front main shaft through the first synchronous belt transmission device; the front end of the rear sub-shaft is drivingly connected to the rear end of the front sub-shaft through the second synchronous belt transmission device; in this way, the machining precision requirement of the first synchronous belt transmission device and the second synchronous belt transmission device is low; secondly, compared with the matching mode of the protrusion and the groove, the transmission matching between the first synchronous wheel, the second synchronous wheel, the first synchronous belt, the linkage synchronous wheel, the second synchronous belt and the sewing machine head has no sliding during sewing, has accurate transmission ratio, high transmission efficiency, ensures uniform sewing needle distance and good consistency of sewing quality, makes the working process of the sewing machine head more stable, and the buffering effect is more soft;

[0031] Secondly, the structural design and matching between the machine base, the extension arm and the elbow piece, the elbow piece comprises a first connecting part extending in the vertical direction of the machine base and a second connecting part extending along one end of the first connecting part, the second connecting part extends along the length direction of the extension arm; the machine base, the extension arm and the first connecting part form an avoiding position; in this way, the first connecting part is vertically extended, which provides a suitable sewing machining position and has a large enough avoiding position, so that the avoiding position is easy for the shell of the luggage to pass through, and the avoiding position can provide a large enough avoiding space for the luggage during the sewing process, so that the shell and the bottom shell of the luggage do not need to be alternately arranged up and down, thereby improving the sewing effect;

[0032] Then it is the design of the installation position, provides the load position for the sewing area of the product to be processed, can reduce the problem of fabric slipping, and effectively improves the precision of the line.

[0033] To make the structural features and effects of the present application clearer, the present application will be described in detail below with reference to the drawings and specific examples. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a perspective view of embodiment one of the present application (initial state);

[0035] Figure 2 is another perspective view of embodiment one of the present application (sewing machine head up state);

[0036] Figure 3 is a top view of embodiment one of the present application (initial state);

[0037] Figure 4 is another perspective view of embodiment one of the present application (sewing machine head up state);

[0038] Figure 5 is an exploded view of embodiment one of the present application;

[0039] Figure 6 is a first partial structure schematic diagram of embodiment one of the present application;

[0040] Figure 7 is a second partial structure schematic diagram of embodiment one of the present application;

[0041] Figure 8 is a third partial structure schematic diagram of embodiment one of the present application;

[0042] Figure 9 is a fourth partial structure schematic diagram of embodiment one of the present application;

[0043] Figure 10 is a fifth partial structure schematic diagram of embodiment one of the present application;

[0044] Figure 11 is a structure diagram of embodiment two of the present application;

[0045] Figure 12 is a first partial structure schematic diagram of embodiment two of the present application;

[0046] Figure 13 is a second partial structure schematic diagram of embodiment two of the present application;

[0047] Figure 14 is a third partial structure schematic diagram of embodiment two of the present application.

[0048] BRIEF DESCRIPTION OF DRAWINGS:

[0049] 10. machine base 21. processing position

[0050] 22. rotating hook assembly 23. lift pin shaft

[0051] 24. feeding shaft 25. rotating hook

[0052] 26. first connecting shaft 28. second connecting shaft

[0053] 30. cross beam 301. upper front connecting arm

[0054] 302. upper front extension shell 303. cross connecting slot

[0055] 31. front section main shaft

[0056] 32. rear section main shaft 33. front section sub-shaft

[0057] 34. rear section sub-shaft 35. sewing machine head

[0058] 351. needle bar 352. head crank

[0059] 353. thread tension lever

[0060] 37. lifting link assembly

[0061] 361. mounting frame 362. pressing member

[0062] 363. lifting driving device 364. guide rail

[0063] 365. connecting frame 366. sliding block

[0064] 367. cross connecting portion

[0065] 38. connecting rod 39. first synchronous belt transmission device

[0066] 391. linkage synchronous wheel

[0067] 392. first synchronous wheel 393. second synchronous wheel

[0068] 394. first synchronous belt 395. second synchronous belt

[0069] 3911. first linkage wheel 3912. second linkage wheel

[0070] 3913. first movable shell 3914. second movable shell

[0071] 3915. rotating member 3916. first synchronous belt tensioning plate

[0072] 3917. second synchronous belt tensioning plate 3918. transmission shaft

[0073] 371, presser foot lifting eccentric wheel set 372, presser foot lifting connecting rod

[0074] 373, presser foot lifting crank 374, presser foot lifting shaft

[0075] 40, extension arm

[0076] 42, linkage assembly 421, third synchronous wheel

[0077] 422, fourth synchronous wheel 423, third synchronous belt

[0078] 424, first feeding pull rod 425, second feeding pull rod

[0079] 43, synchronous belt transmission assembly 431, third connecting shaft

[0080] 432, fourth connecting shaft 433, fifth synchronous wheel

[0081] 434, sixth synchronous wheel 435, fourth synchronous belt

[0082] 50, elbow 51, first connecting part

[0083] 52, second connecting part 53, avoiding position

[0084] 54, setting position. DETAILED DESCRIPTION

[0085] Please refer to Figures 1 to 14 , which shows the specific structure of various embodiments of the present application.

[0086] In the description of the present application, it should be noted that for orientation words, such as terms "up", "down", "front", "back", "left", "right" and the like indicate the orientation and positional relationship shown in the drawings or normal wearing and using, only for the convenience of describing the present application and simplifying the description, and cannot be understood as indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and cannot be understood as limiting the specific protection scope of the present application.

[0087] As Figures 1 to 10 described, it embodies the specific structure of the first embodiment:

[0088] A sewing machine comprises a sewing machine body.

[0089] The sewing machine body has a machine base 10, a sewing machine head 35, a rotating shuttle 25 assembly, the machine base 10 is provided with a lifting driving device 363, the lifting driving device 363 drives the sewing machine head 35 to lift to adjust the height of the sewing machine head 35; the sewing machine body is provided with a front section main shaft 31, a rear section main shaft 32, a front section auxiliary shaft 33, a rear section auxiliary shaft 34 and a main shaft driving device for driving the rear section main shaft 32 to rotate; the front section main shaft 31 is drivingly connected to the front section auxiliary shaft 33; characterized in that:

[0090] The front section main shaft 31 and the front section auxiliary shaft 33 are arranged on the sewing machine head 35; the front end of the rear section main shaft 32 is drivingly connected to the rear end of the front section main shaft 31 through a first synchronous belt 394 transmission device 39; the front end of the rear section auxiliary shaft 34 is drivingly connected to the rear end of the front section auxiliary shaft 33 through a second synchronous belt 395 transmission device;

[0091] The first synchronous belt 394 transmission device 39 and the second synchronous belt 395 transmission device each include a first movable shell 3913, a second movable shell 3914, a first synchronous belt 394, a linkage synchronous wheel 391, a second synchronous belt 395, a first synchronous wheel 392 arranged at the front end of the corresponding rear section main shaft 32 and rear section auxiliary shaft 34, and a second synchronous wheel 393 arranged at the rear end of the corresponding front section main shaft 31 and front section auxiliary shaft 33; the linkage synchronous wheel 391 is provided with a first linkage wheel 3911 and a second linkage wheel 3912, the first synchronous belt 394 is drivingly connected between the first synchronous wheel 392 and the first linkage wheel 3911, and the first movable shell 3913 is movably sleeved outside the first synchronous wheel 392, the first synchronous belt 394 and the first linkage wheel 3911; the second synchronous belt 395 is drivingly connected between the second synchronous wheel 393 and the second linkage wheel 3912, and the second movable shell 3914 is movably sleeved outside the second synchronous wheel 393, the second synchronous belt 395 and the second linkage wheel 3912;

[0092] Among them, the first synchronous belt 394 transmission device 39 and the second synchronous belt 395 transmission device are synchronous belt transmission parts of the same specification, so that only one kind of machining is needed in subsequent sewing machine production and manufacturing; single batch production can be realized, the manufacturing cost is reduced, and the use is beneficial to popularization.

[0093] As shown in Figure 2 The lifting driving device 363 drives the sewing machine head 35 to lift, the front section main shaft 31 and the front section auxiliary shaft 33 lift together with the sewing machine head 35, the second synchronous wheel 393 pulls the linkage synchronous wheel 391 to rotate upward around the first synchronous wheel 392 through the second synchronous belt 395, so that the second movable shell 3914 is arranged at an angle with the first movable shell 3913;

[0094] AsFigure 1 As shown, by default, in the initial state, when the lifting driving device 363 drives the sewing head 35 to descend, the front main shaft 31 and the front auxiliary shaft 33 descend with the sewing head 35, the linkage synchronous wheel 391 rotates downward around the first synchronous wheel 392, so that the second movable shell 3914 is arranged in alignment with the first movable shell 3913.

[0095] The base 10 is further provided with an extension arm 40, and a transmission shaft 3918 is arranged in the extension arm 40. An elbow piece 50 is arranged at an end of the extension arm 40 away from the base 10. The elbow piece 50 comprises a first connecting part 51 arranged in a vertical direction of the base 10 and a second connecting part 52 arranged in a transverse direction of an extension end of the first connecting part 51, and the second connecting part 52 is arranged in a length direction of the extension arm 40. The threader 25 assembly is arranged on the second connecting part 52, and the transmission shaft 3918 is drivingly connected to the threader 25 assembly through a linkage assembly 42. The sewing head 35 and the threader 25 assembly form a processing position 21 therebetween. The base 10, the extension arm 40 and the first connecting part 51 form an avoiding position 53 therebetween for providing an avoiding space for a product to be sewn.

[0096] Preferably, the linkage synchronous wheel 391 is further provided with a rotating piece 3915, a first synchronous belt tensioning plate 3916, a second synchronous belt tensioning plate 3917, a transmission shaft 3918, a first bearing and a second bearing. The first linkage wheel 3911 and the second linkage wheel 3912 are respectively arranged at front and rear ends of the rotating piece 3915. The rotating piece 3915 is sleeved on the transmission shaft 3918. The first bearing and the second bearing are respectively arranged at front and rear ends of the transmission shaft 3918. The first bearing is drivingly connected to the first synchronous belt tensioning plate 3916, and the second bearing is drivingly connected to the second synchronous belt tensioning plate 3917.

[0097] Preferably, the rear main shaft 32 is drivingly connected to the rear auxiliary shaft 34 through a connecting piece, so that the power of the rear main shaft 32 is transmitted to the rear auxiliary shaft 34, and the rear main shaft 32 and the rear auxiliary shaft 34 respectively drive the synchronous belt driving device to drive the sewing head 35 to move up and down. The main shaft driving device is a main power source for the operation of the sewing machine, and is fixedly installed on a machine body of the sewing machine. An output shaft of the main shaft driving device is connected to the rear main shaft 32. When the main shaft driving device operates, the rear main shaft 32 is driven to rotate around an axis of the rear main shaft 32. The rear main shaft 32 can be directly connected to the output shaft of the main shaft driving device. Alternatively, the rear main shaft 32 can be connected to the output shaft of the driving motor through a clutch or a gear set, so as to facilitate the main shaft to obtain a suitable rotating speed or torque.

[0098] Preferably, the upper part of the base 10 corresponding to the extension arm 40 is further provided with a crossbeam 30, the first connecting part 51 is arranged upwardly from the right end of the extension arm 40, the lower end surface of the crossbeam 30, the upper end surface of the extension arm 40 and the left end surface of the first connecting part 51 form an avoiding position 53, the second connecting part 52 is arranged rightwardly from the upper end of the first connecting part 51, wherein the upper end surface of the first connecting part 51 and the upper end surface of the second connecting part 52 form a placing position 54.

[0099] Preferably, the transmission shaft 3918 comprises a lifting shaft 23 and a feeding shaft 24, one end of the lifting shaft 23 and the feeding shaft 24 is drivingly connected to the rotating hook 25 assembly through a linkage assembly 42, the linkage assembly 42 is arranged in the extending direction of the first connecting part 51 and arranged in the first connecting part 51.

[0100] The rotating hook 25 assembly comprises a rotating hook 25, a first connecting shaft 26 and a second connecting shaft 28 connected to the rotating hook 25, the linkage assembly 42 comprises a third synchronous wheel 421, a fourth synchronous wheel 422, a third synchronous belt 423 and a feeding mechanism, the third synchronous wheel 421 is connected to the other end of the lifting shaft 23, the fourth synchronous wheel 422 is above the third synchronous wheel 421, the fourth synchronous wheel 422 is arranged on the first connecting shaft 26, the third synchronous wheel 421 is connected to the fourth synchronous wheel 422 through the third synchronous belt 423.

[0101] The feeding mechanism comprises a first feeding pull rod 424 and a second feeding pull rod 425, the first feeding pull rod 424 is rotatably connected to the other end of the feeding shaft 24, the second feeding pull rod 425 is arranged upwardly from the other end of the first feeding pull rod 424, the other end of the second feeding pull rod 425 is drivingly connected to the second connecting shaft 28.

[0102] Preferably, the crossbeam 30 is provided with an upper front connecting arm 301 and an upper front extension shell 302, the sewing machine head 35 is arranged in the upper front extension shell 302, the upper connecting arm is provided with a mounting frame 361 and a pressing piece 362, one end of the pressing piece 362 is connected to the output end of a lifting driving device 363, the other end of the pressing piece 362 is connected to the upper front extension shell 302, the lifting driving device 363 drives the pressing piece 362 to lift or lower to adjust the height of the sewing machine head 35.

[0103] The front side of the mounting frame 361 is provided with a guide rail 364; the upper end surface of the upper front extension shell 302 is provided with a cross connection groove 303; the rear end of the lower pressing piece 362 is connected to the mounting frame 361 through a connecting frame 365, the rear side of the connecting frame 365 is provided with a sliding block 366 adapted to the guide rail 364, the sliding block 366 is connected in the guide rail 364 and can slide up and down along the guide rail 364; the lower end surface of the connecting frame 365 is provided with a cross connection part 367 for connecting with the cross connection groove 303, the upper end of the connecting frame 365 is connected to the upper front extension shell 302, and the cross connection part 367 is matched in the cross connection groove 303. The connecting mode of the sliding block 366 and the guide rail 364 sliding fit makes the number of whole lifting parts of the sewing machine head 35 less, the compactness of the structure effectively improves, the transmission gap is small, the transmission is stable, accurate and reliable, and the transmission position is accurate. Secondly, the design between the cross connection groove 303 and the cross connection part 367 improves the connection stability between the connecting frame 365 and the upper front extension shell 302, so as to ensure the lifting force or the descending force of the lifting driving device 363 when the sewing machine head 35 rises or falls.

[0104] Preferably, the sewing machine head 35 is also provided with a thread tensioning assembly, the thread tensioning assembly is connected with a needle rod 351, the lower end of the needle rod 351 is provided with a sewing needle adapted to the rotating shuttle 25; the thread tensioning assembly comprises a head crank 352 mounted at one end of the front main shaft 31, a needle rod 351 connecting crank arranged on the head crank 352, a thread tensioning rod 353 sleeved on the needle rod 351 connecting crank, and a connecting rod connected with the needle rod 351 connecting crank, the needle rod 351 is rotatably connected with the connecting rod through an iron rod clamp; the head crank 352 is connected to the front end of the front main shaft 31.

[0105] Preferably, the lifting connecting rod 38 assembly 37 comprises a presser foot lifting eccentric wheel set 371, a presser foot lifting connecting rod 372, a presser foot lifting crank 373 and a presser foot lifting shaft 374; the lifting connecting rod 38 assembly 37 is used for converting the rotating motion of the front main shaft 31 and the rear main shaft 32 into the reciprocating swing motion of the presser foot lifting shaft 374.

[0106] The presser lifting eccentric wheel set 371 is arranged on the front section main shaft and configured to swing when the rear section main shaft 32 rotates; one end of the presser lifting connecting rod 372 is connected to the presser lifting eccentric wheel set 371, and the other end of the presser lifting connecting rod 372 is fixedly connected to one end of the presser lifting crank 373; one end of the presser lifting shaft 374 is movably connected to the other end of the presser lifting crank 373, and the other end of the presser lifting shaft 374 is connected with a presser interaction assembly for converting the reciprocating swing of the presser lifting shaft 374 into the reciprocating movement of the presser up and down. When the main shaft rotates, the presser lifting eccentric wheel set 371 swings, and the eccentric wheel rotates eccentrically around the axis of the main shaft when the presser lifting eccentric wheel set 371 rotates, thereby driving the crank to swing.

[0107] As Figures 11 to 14 shown, which embodies the specific structure of the second embodiment, the second embodiment is different from the first embodiment in that:

[0108] Preferably, the first connecting part 51 is arranged to extend downward from the right side of the extension arm 40, and the right end surface of the base 10, the lower end surface of the extension arm 40 and the left end surface of the first connecting part 51 form an avoiding position 53.

[0109] Preferably, the second connecting part 52 is arranged to extend rightward from the lower end of the first connecting part 51, wherein the right end surface of the first connecting part 51 and the upper end surface of the second connecting part 52 form a placing position 54.

[0110] Preferably, the left end of the lifting tooth shaft 23 and the feeding shaft 24 is further provided with a synchronous belt transmission assembly 43, the synchronous belt transmission assembly 43 is provided with a third connecting shaft 431, a fourth connecting shaft 432, a fifth synchronous wheel 433, a sixth synchronous wheel 434 and a fourth synchronous belt 435, the fifth synchronous wheel 433 is arranged on one end of the lifting tooth shaft 23, the sixth synchronous wheel 434 is arranged on one end of the third connecting shaft 431, and the fifth synchronous wheel 433 is drivingly connected to the sixth synchronous wheel 434 through the fourth synchronous belt 435; the feeding shaft 24 is drivingly connected to one end of the fourth connecting shaft 432 through a linkage rod;

[0111] The fourth synchronous wheel 422 is located below the third synchronous wheel 421; the fourth synchronous wheel 422 is arranged on the first connecting shaft 26, and the third synchronous wheel 421 is connected to the fourth synchronous wheel 422 through the first synchronous belt 394;

[0112] The second feeding pull rod 425 is arranged to extend downward from the other end of the first feeding pull rod 424; the other end of the second feeding pull rod 425 is drivingly connected to the second connecting shaft 28.

[0113] The design focus of the present application is that it is mainly through the structural design of the first synchronous belt transmission device and the second synchronous belt transmission device, the front end of the rear main shaft is drivingly connected to the rear end of the front main shaft through the first synchronous belt transmission device, and the front end of the rear auxiliary shaft is drivingly connected to the rear end of the front auxiliary shaft through the second synchronous belt transmission device, so that the machining precision requirement of the first synchronous belt transmission device and the second synchronous belt transmission device is low, and the transmission matching between the first synchronous wheel, the second synchronous wheel, the first synchronous belt, the linkage synchronous wheel, the second synchronous belt and the sewing machine head is compared with the matching mode of the protrusion and the groove, and there is no sliding during sewing, there is accurate transmission ratio, high transmission efficiency, the sewing pitch is uniform, the sewing quality consistency is good, the working process of the sewing machine head is more stable, and the buffering effect is more soft.

[0114] Secondly, the structural design and cooperation between the base, the extension arm and the elbow piece, the elbow piece comprises a first connecting part extending in the vertical direction of the base and a second connecting part extending along the length direction of the extension arm, the second connecting part is arranged along the length direction of the extension arm, the base, the extension arm and the first connecting part form an avoiding position, so that the first connecting part is arranged in the vertical direction, providing a suitable sewing processing position and having a large avoiding position, so that the avoiding position is easy to pass through the shell of the luggage, and the avoiding position can provide a large avoiding space for the luggage during sewing, and the shell and the bottom shell of the luggage do not need to be alternately arranged up and down during actual sewing, thereby improving the sewing effect.

[0115] Then, the design of the mounting position provides a bearing position for the sewing area of the product to be processed, which can reduce the problem of fabric slipping and effectively improve the accuracy of the line.

[0116] The above is only a preferred embodiment of the present application, and does not limit the technical scope of the present application, so any slight modification, equivalent change and modification of the above embodiment according to the technical essence of the present application are still within the scope of the technical solution of the present application.

Claims

1. A sewing machine comprising a sewing machine body, the sewing machine body having a machine base, a sewing machine head, a rotating shuttle assembly, the machine base being provided with a lifting driving device, the lifting driving device driving the sewing machine head to lift to adjust the height of the sewing machine head, the sewing machine body being provided with a front section main shaft, a rear section main shaft, a front section auxiliary shaft, a rear section auxiliary shaft and a main shaft driving device driving the rear section main shaft to rotate, the front section main shaft being drivingly connected to the front section auxiliary shaft, characterized in that: the front section main shaft and the front section auxiliary shaft are arranged on the sewing machine head, the front end of the rear section main shaft being drivingly connected to the rear end of the front section main shaft through a first synchronous belt driving device, the front end of the rear section auxiliary shaft being drivingly connected to the rear end of the front section auxiliary shaft through a second synchronous belt driving device; the first synchronous belt driving device and the second synchronous belt driving device each comprise a first movable shell, a second movable shell, a first synchronous belt, a linkage synchronous wheel, a second synchronous belt, a first synchronous wheel arranged on the front end of the corresponding rear section main shaft or rear section auxiliary shaft, and a second synchronous wheel arranged on the rear end of the corresponding front section main shaft or front section auxiliary shaft, the linkage synchronous wheel being provided with a first linkage wheel and a second linkage wheel, the first synchronous belt being drivingly connected between the first synchronous wheel and the first linkage wheel, the first movable shell being movably sleeved outside the first synchronous wheel, the first synchronous belt and the first linkage wheel, the second synchronous belt being drivingly connected between the second synchronous wheel and the second linkage wheel, the second movable shell being movably sleeved outside the second synchronous wheel, the second synchronous belt and the second linkage wheel; when the lifting driving device drives the sewing machine head to lift, the front section main shaft and the front section auxiliary shaft lift together with the sewing machine head, the second synchronous wheel pulls the linkage synchronous wheel to rotate upward around the first synchronous wheel through the second synchronous belt, so that the second movable shell is arranged at an angle with the first movable shell; when the lifting driving device drives the sewing machine head to descend, the front section main shaft and the front section auxiliary shaft descend together with the sewing machine head, the linkage synchronous wheel rotates downward around the first synchronous wheel, so that the second movable shell is arranged in alignment with the first movable shell; the machine base is further provided with an extension arm, the extension arm being provided with a transmission shaft inside, the extension arm being provided with an elbow at the end away from the machine base, the elbow comprising a first connecting portion extending in the vertical direction of the machine base and a second connecting portion extending transversely from the extension end of the first connecting portion, and the second connecting portion extending in the length direction of the extension arm, the rotating shuttle assembly being arranged on the second connecting portion, the transmission shaft being drivingly connected to the rotating shuttle assembly through a linkage assembly, a processing position being formed between the sewing machine head and the rotating shuttle assembly, an avoidance position for providing an avoidance space for a product to be sewn being formed between the machine base, the extension arm and the first connecting portion.

2. A sewing machine according to claim 1, characterized in that: The linkage synchronous wheel is further provided with a rotating member, a first synchronous belt tensioning plate, a second synchronous belt tensioning plate, a transmission shaft, a first bearing and a second bearing, the first linkage wheel and the second linkage wheel are respectively arranged at the front and rear ends of the rotating member, the rotating member is sleeved on the transmission shaft, the first bearing and the second bearing are respectively arranged at the front and rear ends of the transmission shaft, the first bearing is in transmission connection with the first synchronous belt tensioning plate, and the second bearing is in transmission connection with the second synchronous belt tensioning plate.

3. The sewing machine of claim 1, wherein: The rear section main shaft is in transmission connection with the rear section auxiliary shaft through the connecting member, so that the power of the rear section main shaft is transmitted to the rear section auxiliary shaft, and the rear section main shaft and the rear section auxiliary shaft drive the synchronous belt transmission device to synchronously drive the sewing machine head to move up and down.

4. The sewing machine of claim 1, wherein: The upper end of the first connecting part is arranged upwards from the right end of the extension arm, and the lower end surface of the cross beam, the upper end surface of the extension arm and the left end surface of the first connecting part form an avoiding position therebetween.

5. The sewing machine of claim 1, wherein: The transmission shaft comprises a lifting tooth shaft and a feeding shaft, one end of the lifting tooth shaft and the feeding shaft is in transmission connection with the rotating hook assembly through a linkage assembly, the linkage assembly is arranged in the extension direction of the first connecting part and in the first connecting part; The rotating hook assembly comprises a rotating hook and first and second connecting shafts connected to the rotating hook, the linkage assembly comprises a third synchronous wheel, a fourth synchronous wheel, a third synchronous belt and a feeding mechanism, the third synchronous wheel is connected to the other end of the lifting tooth shaft, the fourth synchronous wheel is located above the third synchronous wheel, the fourth synchronous wheel is arranged on the first connecting shaft, and the third synchronous wheel is connected to the fourth synchronous wheel through the third synchronous belt; The feeding mechanism comprises first and second feeding pull rods, the first feeding pull rod is rotatably connected to the other end of the feeding shaft, the second feeding pull rod is arranged upwards from the other end of the first feeding pull rod, and the other end of the second feeding pull rod is in transmission connection with the second connecting shaft.

6. The sewing machine of claim 1, wherein: The first connecting part is arranged downwards from the right side of the extension arm, and the right end surface of the machine base, the lower end surface of the extension arm and the left end surface of the first connecting part form an avoiding position therebetween.

7. A sewing machine according to claim 6, characterised in that: The second connecting part is arranged rightwards from the lower end of the first connecting part, and the right end surface of the first connecting part and the upper end surface of the second connecting part form a placing position therebetween.

8. The sewing machine of claim 5, wherein: The left end of the lifting tooth shaft and the feeding shaft is further provided with a synchronous belt transmission assembly, the synchronous belt transmission assembly is provided with third and fourth connecting shafts, a fifth synchronous wheel, a sixth synchronous wheel and a fourth synchronous belt, the fifth synchronous wheel is arranged on one end of the lifting tooth shaft, the sixth synchronous wheel is arranged on one end of the third connecting shaft, the fifth synchronous wheel is in transmission connection with the sixth synchronous wheel through the fourth synchronous belt, and the feeding shaft is in transmission connection with one end of the fourth connecting shaft through a linkage rod. The fourth synchronous wheel is located below the third synchronous wheel, the fourth synchronous wheel is arranged on the first connecting shaft, and the third synchronous wheel is connected to the fourth synchronous wheel through the first synchronous belt. The second feeding pull rod is arranged downward from the other end of the first feeding pull rod and is drivingly connected to the second connecting shaft.

9. The sewing machine of claim 4, wherein: The upper front connecting arm is provided with a mounting frame and a pressing piece, one end of the pressing piece is connected to the output end of the lifting driving device, the other end of the pressing piece is connected to the upper front extension shell, and the lifting driving device drives the pressing piece to lift to adjust the height of the sewing machine head. The front side of the mounting frame is provided with a guide rail, and the upper end surface of the upper front extension shell is provided with a cross-shaped connecting groove. The rear end of the pressing piece is connected to the mounting frame through a connecting frame, the rear side of the connecting frame is provided with a sliding block matched with the guide rail, the sliding block is connected to the guide rail and slides up and down along the guide rail, the lower end surface of the connecting frame is provided with a cross-shaped connecting part matched with the cross-shaped connecting groove, the upper end of the connecting frame is connected to the upper front extension shell, and the cross-shaped connecting part is matched with the cross-shaped connecting groove.

10. The sewing machine of claim 1, wherein: The thread tensioning assembly is connected with a needle rod, and the lower end of the needle rod is provided with a sewing needle matched with the rotating shuttle.

Images