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, an extension arm is arranged on the machine base, and a front section main shaft, a rear section main shaft, a front section auxiliary shaft and a rear section auxiliary shaft are arranged on the sewing machine body; the front end of the rear-section main shaft is in transmission connection with the rear end of the front-section main shaft through a first synchronous belt transmission device; the front end of the rear section countershaft is in transmission connection with the rear end of the front section countershaft through a second synchronous belt transmission device; the end, away from the machine base, of the extending arm extends to be provided with a turning piece, the turning piece comprises a first connecting part and a second connecting part, and an avoiding position is defined by the machine base, the extending arm and the first connecting part. Therefore, compared with a matching mode of a protrusion and a groove, during sewing work, sliding is avoided, the accurate transmission ratio is achieved, the transmission efficiency is high, it is guaranteed that the sewing needle 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 softer.

Description

Technical Field

[0001] The invention relates to the field of sewing machines, in particular to a sewing machine. Background Art

[0002] The luggage sewing machine is one of the most commonly used sewing machines for luggage making. It can also be called an industrial flat-bed sewing machine. It can be used to sew fabrics, linings and other details of luggage. It has the characteristics of fast speed, uniform stitching and convenient adjustment of thread tension.

[0003] The prior art discloses a sewing machine with synchronous belt drive, comprising a main shaft, a machine head, a tooth frame and a driving motor; a sewing mechanism is arranged below the machine head, the main shaft is arranged between the machine head and the driving motor, the driving motor drives the main shaft to rotate to drive the sewing mechanism to work, a tooth frame is arranged below the machine head, and a gap is arranged between the machine head and the tooth frame to place cloth; the main shaft comprises a front section main shaft and a rear section main shaft; the front section main shaft is connected to the machine head, and the rear section main shaft is rotatably connected to the driving motor; a first connecting component is arranged at the end where the front section main shaft is connected to the rear section main shaft, and a second connecting component is arranged at the end where the rear section main shaft is connected to the front section main shaft, and the first connecting component The first connecting assembly and the second connecting assembly can slide against each other in the vertical direction so that the two connecting assemblies can be separated or connected to each other; when the sewing machine is not working, the head moves upward in the vertical direction away from the tooth frame, so that the first connecting assembly and the second connecting assembly are separated from each other; when the sewing machine is to work, the head moves downward in the vertical direction so that the first connecting assembly and the second connecting assembly are connected to each other, and the driving motor drives the rear section spindle to rotate, thereby driving the front section spindle to rotate to drive the sewing mechanism to work, so as to sew the cloth; so that the sewing mechanism under the head can be lifted to a greater height, so that fluffy cloth or thicker cloth can be sewn; However, this kind of synchronous belt driven sewing machine has the following defects:

[0004] For example, the first connecting component and the second connecting component are two parts of the coupling; one connecting component is provided with a groove, and the other connecting component is provided with a protrusion. When the sewing machine is not working, the machine head moves upward in the vertical direction away from the tooth frame, so that the first connecting component and the second connecting component are separated from each other; the matching mode of the protrusion and the groove is adopted, and the connecting matching surfaces of the first connecting component and the second connecting component must be machined with high precision, otherwise they cannot be used together;

[0005] Secondly, when the machine head and the front spindle slide along the vertical direction with the rear spindle and the driving motor, 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 greater height. This will result in the protrusion not being able to be fully engaged in the groove during sewing, resulting in the driving force of the driving motor to drive the rear spindle to rotate not being able to be fully applied to the front spindle, thereby affecting the operation of the sewing mechanism and reducing the product qualification rate of the sewing machine.

[0006] Therefore, it is necessary to study a new technical solution to solve the above problems. Summary of the invention

[0007] In view of this, the present invention aims at the deficiencies in the prior art, and its main purpose is to provide a sewing machine, which has a first synchronous belt transmission device and a second synchronous belt transmission device through the structural design. In this way, the transmission cooperation between the first synchronous wheel, the second synchronous wheel, the first synchronous belt, the interlocking synchronous wheel, the second synchronous belt and the sewing machine head is compared with the cooperation mode of the protrusion and the groove. During sewing, there is no slippage, an accurate transmission ratio, and high transmission efficiency, which ensures uniform sewing stitch length and good consistency of sewing quality, making the working process of the sewing machine head more stable and the buffering effect softer.

[0008] To achieve the above purpose, the present invention adopts the following technical solutions:

[0009] A sewing machine, comprising a sewing machine body, the sewing machine body having a machine base, a sewing machine head, and a rotary hook assembly, the machine base being provided with a lifting drive device, the lifting drive device driving the sewing machine head to lift and lower so as 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 secondary shaft, a rear section secondary 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 secondary shaft;

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

[0011] The first synchronous belt transmission device and the second synchronous belt transmission device both include a first movable shell, a second movable shell, a first synchronous belt, a linkage synchronous wheel, a second synchronous belt and a first synchronous wheel arranged at the front end of the corresponding rear section main shaft and the rear section secondary shaft, and a second synchronous wheel arranged at the rear end of the corresponding front section main shaft and the front section secondary 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 can be 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 can be 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, and the second synchronous wheel pulls the linked synchronous wheel through the second synchronous belt to rotate upward around the first synchronous wheel, so that the second movable shell is arranged at an angle with the first movable shell;

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

[0014] An extension arm is also provided on the machine base, and a transmission shaft is provided in the extension arm; a bend is extended from one end of the extension arm away from the machine base, and the bend includes a first connection portion extending in the vertical direction of the machine base and a second connection portion extending laterally from the extension end of the first connection portion, and the second connection portion extends along the length direction of the extension arm; the rotary shuttle assembly is arranged on the second connection portion, and the transmission shaft is connected to the rotary shuttle assembly through a linkage assembly, and a processing position is formed between the sewing machine head and the rotary shuttle assembly; an avoidance position for providing an avoidance space for the product to be sewn is formed between the machine base, the extension arm and the first connection portion.

[0015] As a preferred solution, the linked synchronous wheel is also provided with 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 linked wheel and the second linked wheel are respectively arranged at the front and rear ends of the rotating part; the rotating part is sleeved outside 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 transmission-connected to the first synchronous belt tensioning plate, and the second bearing is transmission-connected to the second synchronous belt tensioning plate.

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

[0017] As a preferred embodiment, a cross beam is further arranged above the corresponding extension arm on the machine base, and the first connecting part is extended upward from the right end of the extension arm, and an avoidance position is formed between 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 extended to the right from the upper end of the first connecting part, wherein an accommodation position is formed between 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 includes a tooth lifting shaft and a feeding shaft, one end of the tooth lifting shaft and the feeding shaft are connected to the rotary hook assembly through a linkage assembly, and the linkage assembly is arranged in the extension direction of the first connecting part and is disposed in the first connecting part;

[0019] The rotary hook assembly includes a rotary hook and a first connecting shaft and a second connecting shaft connected to the rotary hook; the linkage assembly includes 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 tooth lifting 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 includes a first feeding rod and a second feeding rod, wherein the first feeding rod is rotatably connected to the other end of the feeding shaft; the second feeding rod is extended upward from the other end of the first feeding rod; and the other end of the second feeding rod is transmission-connected to the second connecting shaft.

[0021] As a preferred solution, the first connection portion is extended downward from the right side of the extension arm, and an escape position is formed between the right end surface of the base, the lower end surface of the extension arm and the left end surface of the first connection portion.

[0022] As a preferred solution, the second connection part is extended rightward from the lower end of the first connection part, wherein a placement position is formed between the right end surface of the first connection part and the upper end surface of the second connection part.

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

[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 rod is extended downward from the other end of the first feeding rod; the other end of the second feeding rod is transmission-connected to the second connecting shaft.

[0026] As a preferred solution, the crossbeam is provided with an upper front connecting arm and an upper front extension shell, and the sewing machine head is provided on the upper front extension shell; the upper connecting arm is provided with a mounting frame and a pressing member; one end of the pressing member is connected to the output end of the lifting drive device, and the other end of the pressing member is connected to the upper front extension shell, and the lifting drive device drives the pressing member to rise and fall to adjust the height of the sewing machine head;

[0027] A guide rail is provided on the front side of the mounting frame; a cross connection groove is provided on the upper end surface of the upper front extension shell;

[0028] The rear end of the pressing member is connected to the mounting frame through a connecting frame, and a slider for matching with the guide rail is provided on the rear side of the connecting frame. The slider is connected in the guide rail and can slide up and down along the guide rail; a cross connecting part for connecting with the cross connecting groove is provided on the lower end surface of the connecting frame, and the upper end of the connecting frame is connected to the upper front extension shell, and the cross connecting part cooperates with the cross connecting groove.

[0029] As a preferred solution, a thread take-up assembly is also provided on the side of the sewing machine head, and the thread take-up assembly is connected to a needle bar, and a sewing needle adapted to the rotary shuttle is provided at the lower end of the needle bar; the thread take-up assembly includes a head crank installed on one end of the front section main shaft, a needle bar connecting crank arranged on the head crank, a thread take-up rod sleeved on the needle bar connecting crank, and a connecting rod connected to the needle bar connecting crank, and the needle bar is rotatably connected to the connecting rod through an iron rod chuck; the head crank is connected to the front end of the front section main shaft.

[0030] Compared with the prior art, the present invention has obvious advantages and beneficial effects. Specifically, it can be seen from the above technical scheme that the front end of the rear main shaft is connected to the rear end of the front main shaft through the first synchronous belt transmission device; the front end of the rear secondary shaft is connected to the rear end of the front secondary shaft through the second synchronous belt transmission device; in this way, the first synchronous belt transmission device and the second synchronous belt transmission device have low transmission processing accuracy requirements; secondly, the transmission cooperation 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 cooperation mode of the protrusion and the groove. There is no slippage during sewing, there is an accurate transmission ratio, the transmission efficiency is high, the sewing stitch length is uniform, the sewing quality consistency is good, the working process of the sewing machine head is more stable, and the buffering effect is softer;

[0031] The second is the structural design and coordination between the machine base, the extension arm and the turning piece. The turning piece includes a first connecting portion extending along the vertical direction of the machine base and a second connecting portion extending along one end of the first connecting portion, and the second connecting portion is extended along the length direction of the extension arm; an avoidance position is formed between the machine base, the extension arm and the first connecting portion. In this way, the first connecting portion is extended in the vertical direction to provide a suitable sewing processing position while having a sufficiently large avoidance position. In this way, the avoidance position is easy for the outer shell of the bag to pass through. During the sewing process, the avoidance position can provide a sufficiently large avoidance space for the bag. During actual sewing, the outer shell and the bottom shell of the bag do not need to alternate up and down, thereby improving the sewing effect;

[0032] Then comes the design of the placement position, which provides a bearing position for the sewing area of ​​the product to be processed, can reduce the problem of fabric slipping, and effectively improve the accuracy of the routing.

[0033] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a stereogram of the first embodiment of the present invention (initial state);

[0035] Figure 2 It is another three-dimensional diagram of the first embodiment of the present invention (sewing machine head raised state);

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

[0037] Figure 4 It is another stereoscopic view of the first embodiment of the present invention (sewing machine head rising state);

[0038] Figure 5 It is an exploded view of the first embodiment of the present invention;

[0039] Figure 6 It is a first partial structural schematic diagram of the first embodiment of the present invention;

[0040] Figure 7 It is a second partial structural schematic diagram of the first embodiment of the present invention;

[0041] Figure 8 It is a schematic diagram of the third partial structure of the first embodiment of the present invention;

[0042] Fig. 9 It is a schematic diagram of the fourth partial structure of the first embodiment of the present invention;

[0043] Fig.10 It is a schematic diagram of the fifth partial structure of the first embodiment of the present invention;

[0044] Fig.11 is a structural diagram of the second embodiment of the present invention;

[0045] Fig.12 This is a schematic diagram of the first partial structure of the second embodiment of the present invention;

[0046] Fig.13 It is a schematic diagram of the second partial structure of the second embodiment of the present invention;

[0047] Fig.14 It is a schematic diagram of the third partial structure of the second embodiment of the present invention.

[0048] Description of the accompanying drawings:

[0049] 10. Machine base 21. Processing position

[0050] 22. Rotary hook assembly 23. Lifting shaft

[0051] 24. Feeding shaft 25. Rotary 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 connection groove

[0055] 31. Front spindle

[0056] 32, rear main shaft 33, front secondary shaft

[0057] 34. Rear secondary shaft 35. Sewing machine head

[0058] 351, needle rod 352, head crank

[0059] 353. Take-up lever

[0060] 37. Lifting rod assembly

[0061] 361, mounting frame 362, lower pressure piece

[0062] 363. Lifting drive device 364. Guide rail

[0063] 365, connecting frame 366, slider

[0064] 367, Cross connection

[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 part 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 rod 425, second feeding 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. bending member 51. first connecting portion

[0083] 52. Second connection part 53. Avoidance position

[0084] 54. Placement position. DETAILED DESCRIPTION

[0085] Please refer to Figures 1 to 14 As shown, it shows the specific structure of various embodiments of the present invention.

[0086] In the description of the present invention, it should be noted that directional words, such as the terms "up", "down", "front", "back", "left", "right", etc., indicating directions and positional relationships are based on the directions or positional relationships shown in the drawings or during normal wearing and use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and cannot be understood as limiting the specific scope of protection of the present invention.

[0087] like Figures 1 to 10 The above embodiment embodies the specific structure of the first embodiment:

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

[0089] The sewing machine body comprises a machine base 10, a sewing machine head 35, and a rotary hook 25 assembly. The machine base 10 is provided with a lifting drive device 363, and the lifting drive device 363 drives the sewing machine head 35 to rise and fall 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 secondary shaft 33, a rear section secondary shaft 34, and a main shaft driving device driving the rear section main shaft 32 to rotate; the front section main shaft 31 is transmission-connected to the front section secondary shaft 33; the characteristics are as follows:

[0090] The front main shaft 31 and the front secondary shaft 33 are arranged on the sewing machine head 35; the front end of the rear main shaft 32 is connected to the rear end of the front main shaft 31 through the first synchronous belt 394 transmission device 39; the front end of the rear secondary shaft 34 is connected to the rear end of the front secondary shaft 33 through the 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 and a first synchronous wheel 392 arranged at the front end of the corresponding rear section main shaft 32 and the rear section secondary shaft 34, and a second synchronous wheel 393 arranged at the rear end of the corresponding front section main shaft 31 and the front section secondary 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 connected between the first synchronous wheel 392 and the first linkage wheel 3911, and the first movable shell 3913 is movably mounted outside the first synchronous wheel 392, the first synchronous belt 394 and the first linkage wheel 3911; the second synchronous belt 395 is connected between the second synchronous wheel 393 and the second linkage wheel 3912, and the second movable shell 3914 is movably mounted 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 both synchronous belt transmission parts of the same specification, so that in the subsequent production and manufacturing of sewing machines, only one type of processing is required; they can be produced in a single batch, which reduces the manufacturing cost and is conducive to promotion and use.

[0093] like Figure 2 The figure shows the sewing machine in the rising state. When the lifting drive device 363 drives the sewing machine head 35 to rise, the front main shaft 31 and the front auxiliary shaft 33 rise together with the sewing machine head 35. The second synchronous wheel 393 pulls the linkage synchronous wheel 391 through the second synchronous belt 395 to rotate upward around the first synchronous wheel 392, so that the second movable shell 3914 is arranged at an angle with the first movable shell 3913.

[0094] like Figure 1 As shown, the default is the initial state. When the lifting drive device 363 drives the sewing machine head 35 to descend, the front main shaft 31 and the front secondary shaft 33 descend together with the sewing machine head 35, and the linkage synchronous wheel 391 rotates downward around the first synchronous wheel 392, so that the second movable shell 3914 is aligned with the first movable shell 3913;

[0095] An extension arm 40 is also provided on the machine base 10, and a transmission shaft 3918 is provided in the extension arm 40; a bend piece 50 is extended from one end of the extension arm 40 away from the machine base 10, and the bend piece 50 includes a first connection part 51 extending in the vertical direction of the machine base 10 and a second connection part 52 extending laterally from the extension end of the first connection part 51, and the second connection part 52 extends along the length direction of the extension arm 40; the rotary shuttle 25 assembly is arranged on the second connection part 52, and the transmission shaft 3918 is connected to the rotary shuttle 25 assembly through the linkage assembly 42, and a processing position 21 is formed between the sewing machine head 35 and the rotary shuttle 25 assembly; an avoidance position 53 for providing an avoidance space for the product to be sewn is formed between the machine base 10, the extension arm 40 and the first connection part 51.

[0096] Preferably, the linked synchronous wheel 391 is also provided with a rotating part 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, and the first linked wheel 3911 and the second linked wheel 3912 are respectively arranged at the front and rear ends of the rotating part 3915; the rotating part 3915 is sleeved on the outside of the transmission shaft 3918; the first bearing and the second bearing are respectively arranged at the front and rear ends of the transmission shaft 3918, the first bearing is transmission-connected to the first synchronous belt tensioning plate 3916, and the second bearing is transmission-connected to the second synchronous belt tensioning plate 3917.

[0097] Preferably, the rear section main shaft 32 is connected to the rear section secondary shaft 34 through a connecting member, so that the power of the rear section main shaft 32 is transmitted to the rear section secondary shaft 34, so that the rear section main shaft 32 and the rear section secondary shaft 34 respectively drive the synchronous belt transmission device to synchronously drive the sewing machine head 35 to move up and down. The spindle drive device is the main power source for the sewing machine, which is fixedly installed on the body of the sewing machine. The output shaft of the spindle drive device is connected to the rear section main shaft 32. When the spindle drive device is working, it drives the rear section main shaft 32 to rotate around the axis of the rear section main shaft 32; wherein, the rear section main shaft 32 can be directly connected to the output device of the spindle drive device; or, it can also be connected to the output shaft of the drive motor through a clutch or a gear set, so that the spindle can obtain a suitable speed or torque.

[0098] Preferably, a cross beam 30 is further provided above the corresponding extension arm 40 on the machine base 10, and the first connecting portion 51 is extended upward from the right end of the extension arm 40, and an avoidance position 53 is formed between the lower end surface of the cross beam 30, the upper end surface of the extension arm 40 and the left end surface of the first connecting portion 51; the second connecting portion 52 is extended rightward from the upper end of the first connecting portion 51, wherein an accommodation position 54 is formed between the upper end surface of the first connecting portion 51 and the upper end surface of the second connecting portion 52.

[0099] Preferably, the transmission shaft 3918 includes a tooth-lifting shaft 23 and a feeding shaft 24, one end of the tooth-lifting shaft 23 and the feeding shaft 24 are connected to the rotary hook 25 assembly through a linkage assembly 42, and the linkage assembly 42 is arranged from the extension direction of the first connecting portion 51 and is disposed in the first connecting portion 51;

[0100] The rotary hook 25 assembly includes a rotary hook 25 and a first connecting shaft 26 and a second connecting shaft 28 connected to the rotary hook 25; the linkage assembly 42 includes 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 tooth lifting shaft 23, and the fourth synchronous wheel 422 is located above 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 third synchronous belt 423;

[0101] The feeding mechanism includes a first feeding rod 424 and a second feeding rod 425. The first feeding rod 424 is rotatably connected to the other end of the feeding shaft 24; the second feeding rod 425 extends upward from the other end of the first feeding rod 424; the other end of the second feeding rod 425 is transmission-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, and the sewing machine head 35 is provided on the upper front extension shell 302; the upper connecting arm is provided with a mounting frame 361 and a pressing member 362; one end of the pressing member 362 is connected to the output end of the lifting drive device 363, and the other end of the pressing member 362 is connected to the upper front extension shell 302, and the lifting drive device 363 drives the pressing member 362 to rise and fall to adjust the height of the sewing machine head 35;

[0103] A guide rail 364 is provided on the front side of the mounting frame 361; a cross connecting groove 303 is provided on the upper end surface of the upper front extension shell 302; the rear end of the pressing member 362 is connected to the mounting frame 361 through a connecting frame 365, and a slider 366 for matching with the guide rail 364 is provided on the rear side of the connecting frame 365, and the slider 366 is connected to the guide rail 364 and can slide up and down along the guide rail 364; a cross connecting portion 367 for connecting with the cross connecting groove 303 is provided on the lower end surface of the connecting frame 365, and the upper end of the connecting frame 365 is connected to the upper front extension shell 302, and the cross connecting portion 367 is matched with the cross connecting groove 303. The sliding connection mode of the slider 366 and the guide rail 364 is adopted, so that the number of the overall lifting parts of the sewing machine head 35 is small, the compactness of the structure is effectively improved, and the transmission gap is small, the transmission is stable and accurate, and when the lifting drive device 363 controls the upward movement of sewing, the slider 366 can slide upward in the sliding guide groove of the guide rail 364, and the vertically arranged sliding guide groove can ensure the accuracy of the movement trajectory of the slider 366, and the guiding effect is good. When the sewing falls back downward, the slider 366 slides to the original position in the sliding guide groove, so that the transmission is 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 descending force of the lifting drive device 363 on the sewing machine head 35 when it rises or falls.

[0104] Preferably, a thread taking-up assembly is also provided on the side of the sewing machine head 35, and the thread taking-up assembly is connected to a needle bar 351, and a sewing needle adapted to the rotary shuttle 25 is provided at the lower end of the needle bar 351; the thread taking-up assembly includes a head crank 352 installed on one end of the front section main shaft 31, a needle bar 351 connecting crank provided on the head crank 352, a thread taking-up rod 353 sleeved on the needle bar 351 connecting crank, and a connecting rod connected to the needle bar 351 connecting crank, and the needle bar 351 is rotatably connected to the connecting rod through an iron rod chuck; the head crank 352 is connected to the front end of the front section main shaft 31.

[0105] Preferably, the lifting connecting rod 38 assembly 37 includes a presser foot lifting eccentric wheel group 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 3838 assembly 37 is used to convert the rotational motion of the front section main shaft 31 and the rear section main shaft 32 into the reciprocating swinging motion of the presser foot lifting shaft 374.

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

[0107] like Figures 11 to 14 As shown, it embodies the specific structure of the second embodiment. The difference between the second embodiment and the first embodiment is that:

[0108] Preferably, the first connection portion 51 extends downward from the right side of the extension arm 40 , and an avoidance position 53 is formed between 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 connection portion 51 .

[0109] Preferably, the second connection portion 52 is extended rightward from the lower end of the first connection portion 51 , wherein a placement position 54 is formed between the right end surface of the first connection portion 51 and the upper end surface of the second connection portion 52 .

[0110] Preferably, the left ends of the tooth-lifting shaft 23 and the feeding shaft 24 are also provided with a synchronous belt transmission assembly 43, and 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 provided on one end of the tooth-lifting shaft 23, and the sixth synchronous wheel 434 is provided on one end of the third connecting shaft 431. The fifth synchronous wheel 433 is connected to the sixth synchronous wheel 434 through a fourth synchronous belt 435; the feeding shaft 24 is 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 disposed on the first connecting shaft 26, and the third synchronous wheel 421 is connected to the fourth synchronous wheel 422 via the first synchronous belt 394;

[0112] The second feeding rod 425 extends downward from the other end of the first feeding rod 424 ; the other end of the second feeding rod 425 is transmission-connected to the second connecting shaft 28 .

[0113] The design focus of the present invention 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 section main shaft is connected to the rear end of the front section main shaft through the first synchronous belt transmission device; the front end of the rear section secondary shaft is connected to the rear end of the front section secondary shaft through the second synchronous belt transmission device; in this way, the first synchronous belt transmission device and the second synchronous belt transmission device have low transmission processing accuracy requirements; secondly, the transmission cooperation 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 cooperation mode of the protrusion and the groove, there is no slippage during sewing, there is an accurate transmission ratio, the transmission efficiency is high, the sewing stitch length is uniform, the sewing quality consistency is good, the working process of the sewing machine head is more stable, and the buffer effect is softer;

[0114] The second is the structural design and coordination between the machine base, the extension arm and the turning piece. The turning piece includes a first connecting portion extending along the vertical direction of the machine base and a second connecting portion extending along one end of the first connecting portion, and the second connecting portion is extended along the length direction of the extension arm; an avoidance position is formed between the machine base, the extension arm and the first connecting portion. In this way, the first connecting portion is extended in the vertical direction to provide a suitable sewing processing position while having a sufficiently large avoidance position. In this way, the avoidance position is easy for the outer shell of the bag to pass through. During the sewing process, the avoidance position can provide a sufficiently large avoidance space for the bag. During actual sewing, the outer shell and the bottom shell of the bag do not need to alternate up and down, thereby improving the sewing effect;

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

[0116] The above description is only a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any slight modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A sewing machine, comprising a sewing machine body, the sewing machine body having a machine base, a sewing machine head, and a rotary hook assembly, the machine base being provided with a lifting drive device, the lifting drive device driving the sewing machine head to lift and lower 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 secondary shaft, a rear section secondary shaft, and a main shaft driving device driving the rear section main shaft to rotate; the front section main shaft is drivingly connected to the front section secondary shaft; characterized in that: The front main shaft and the front secondary shaft are arranged on the sewing machine head; the front end of the rear main shaft is connected to the rear end of the front main shaft through a first synchronous belt transmission device; the front end of the rear secondary shaft is connected to the rear end of the front secondary shaft through a second synchronous belt transmission device; The first synchronous belt transmission device and the second synchronous belt transmission device both include a first movable shell, a second movable shell, a first synchronous belt, a linkage synchronous wheel, a second synchronous belt and a first synchronous wheel arranged at the front end of the corresponding rear section main shaft and the rear section secondary shaft, and a second synchronous wheel arranged at the rear end of the corresponding front section main shaft and the front section secondary 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 can be 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 can be movably sleeved outside the second synchronous wheel, the second synchronous belt and the second linkage wheel; 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, and the second synchronous wheel pulls the linked synchronous wheel through the second synchronous belt to rotate upward around the first synchronous wheel, so that the second movable shell is arranged at an angle with the first movable shell; When the lifting drive device drives the sewing machine head to descend, the front main shaft and the front auxiliary shaft descend together with the sewing machine head, and the linkage synchronous wheel rotates downward around the first synchronous wheel, so that the second movable shell is aligned with the first movable shell; An extension arm is also provided on the machine base, and a transmission shaft is provided in the extension arm; a bend is extended from one end of the extension arm away from the machine base, and the bend includes a first connection portion extending in the vertical direction of the machine base and a second connection portion extending laterally from the extension end of the first connection portion, and the second connection portion extends along the length direction of the extension arm; the rotary shuttle assembly is arranged on the second connection portion, and the transmission shaft is connected to the rotary shuttle assembly through a linkage assembly, and a processing position is formed between the sewing machine head and the rotary shuttle assembly; an avoidance position for providing an avoidance space for the product to be sewn is formed between the machine base, the extension arm and the first connection portion.

2. A sewing machine according to claim 1, characterized in that: The linked synchronous wheel is also provided with 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 linked wheel and the second linked wheel are respectively arranged at the front and rear ends of the rotating part; the rotating part is sleeved outside 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 transmission-connected to the first synchronous belt tensioning plate, and the second bearing is transmission-connected to the second synchronous belt tensioning plate.

3. A sewing machine according to claim 1, characterized in that: The rear main shaft is connected to the rear secondary shaft through a connecting piece, so that the power of the rear main shaft is transmitted to the rear secondary shaft, so that the rear main shaft and the rear secondary shaft respectively drive the synchronous belt transmission device to synchronously drive the sewing machine head to move up and down.

4. A sewing machine according to claim 1, characterized in that: A crossbeam is also arranged above the corresponding extension arm on the machine base, and the first connecting part is extended upward from the right end of the extension arm, and an avoidance position is formed between the lower end surface of the crossbeam, the upper end surface of the extension arm and the left end surface of the first connecting part; the second connecting part is extended to the right from the upper end of the first connecting part, wherein a placement position is formed between the upper end surface of the first connecting part and the upper end surface of the second connecting part.

5. A sewing machine according to claim 1, characterized in that: The transmission shaft includes a tooth lifting shaft and a feeding shaft, one end of the tooth lifting shaft and the feeding shaft is connected to the rotary hook assembly through a linkage assembly, and the linkage assembly is arranged in the extension direction of the first connecting part and is disposed in the first connecting part; The rotary hook assembly includes a rotary hook and a first connecting shaft and a second connecting shaft connected to the rotary hook; the linkage assembly includes 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 tooth lifting 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; The feeding mechanism includes a first feeding rod and a second feeding rod, wherein the first feeding rod is rotatably connected to the other end of the feeding shaft; the second feeding rod is extended upward from the other end of the first feeding rod; and the other end of the second feeding rod is transmission-connected to the second connecting shaft.

6. A sewing machine according to claim 1, characterized in that: The first connection portion is extended downward from the right side of the extension arm, and a relief position is formed between the right end surface of the base, the lower end surface of the extension arm and the left end surface of the first connection portion.

7. A sewing machine according to claim 6, characterized in that: The second connection portion is extended rightward from the lower end of the first connection portion, wherein a placement position is formed between the right end surface of the first connection portion and the upper end surface of the second connection portion.

8. A sewing machine according to claim 5, characterized in that: The left ends of the tooth-lifting shaft and the feeding shaft are also provided with a synchronous belt transmission assembly, and 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 tooth-lifting shaft, the sixth synchronous wheel is arranged on one end of the third connecting shaft, and the fifth synchronous wheel is connected to the sixth synchronous wheel through the fourth synchronous belt transmission; the feeding shaft is connected to one end of the fourth connecting shaft through a linkage rod transmission; 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 rod is extended downward from the other end of the first feeding rod; the other end of the second feeding rod is transmission-connected to the second connecting shaft.

9. A sewing machine according to claim 4, characterized in that: The crossbeam is provided with an upper front connecting arm and an upper front extension shell, and the sewing machine head is provided on the upper front extension shell; the upper connecting arm is provided with a mounting frame and a pressing member; one end of the pressing member is connected to the output end of the lifting drive device, and the other end of the pressing member is connected to the upper front extension shell, and the lifting drive device drives the pressing member to rise and fall to adjust the height of the sewing machine head; A guide rail is provided on the front side of the mounting frame; a cross connection groove is provided on the upper end surface of the upper front extension shell; The rear end of the pressing member is connected to the mounting frame through a connecting frame, and a slider for matching with the guide rail is provided on the rear side of the connecting frame. The slider is connected in the guide rail and can slide up and down along the guide rail; a cross connecting part for connecting with the cross connecting groove is provided on the lower end surface of the connecting frame, and the upper end of the connecting frame is connected to the upper front extension shell, and the cross connecting part cooperates with the cross connecting groove.

10. A sewing machine according to claim 1, characterized in that: A thread take-up assembly is also provided on the side of the sewing machine head, and the thread take-up assembly is connected to a needle bar, and a sewing needle adapted to the rotary shuttle is provided at the lower end of the needle bar; the thread take-up assembly includes a head crank installed on one end of the front section main shaft, a needle bar connecting crank arranged on the head crank, a thread take-up rod sleeved on the needle bar connecting crank, and a connecting rod connected to the needle bar connecting crank, and the needle bar is rotatably connected to the connecting rod through an iron rod chuck; the head crank is connected to the front end of the front section main shaft.

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