An industrial sewing machine that is easy to assemble

Abstract

The embodiment of the present invention discloses an industrial sewing machine that is easy to assemble, including a sewing machine head, a base, a feeding mechanism, an upper and lower shaft synchronization mechanism and a needle feed dog synchronization mechanism, wherein the upper and lower movement of the needle of the sewing machine head is driven by the upper shaft, and the forward and backward swing is driven by the feed shaft; the rotary shuttle of the base is driven by the lower shaft, and the feed dog is driven by the transition shaft; the upper shaft and the lower shaft are linked by the upper and lower shaft synchronization mechanism, and the feed shaft and the transition shaft are linked by the needle feed dog synchronization mechanism; the transmission paths of the upper and lower shaft synchronization mechanism and the needle feed dog synchronization mechanism all pass through the bracket behind the needle and the support seat on one side of the bracket; the feeding mechanism is arranged behind the needle for transmitting cloth. The present invention can realize the simultaneous sewing of mattress fabric and both sides of the chain, improve sewing efficiency, and at the same time ensure the symmetry of the cloth on both sides, so that the zipper opens and closes smoothly.

Description

Technical Field

[0001] The invention relates to a sewing machine, in particular to an industrial sewing machine which is easy to assemble. Background Art

[0002] A zipper is a connector that connects or separates items by means of continuously arranged chain teeth. It consists of chain teeth, a puller, upper and lower stops (front and rear stops) or locking parts. The chain teeth are the key part, which directly determines the side pull strength of the zipper. Generally, a zipper has two chain belts, each with a row of chain teeth, and the two rows of chain teeth are arranged alternately. The puller clamps the chain teeth on both sides, and with the help of the pull loop, the chain teeth on both sides can be engaged or disengaged.

[0003] The existing sewing zipper process is to sew two interlocking chain belts on a piece of fabric first, and then sew another piece of fabric on the other side of the chain belt. This is because if the two chain belts are sewn at the same time, one side of the fabric will be blocked by the vertical arm connecting the sewing machine head and the base located on the right side of the machine head. Since industrial sewing machines have a long service life and a large inventory, it is not realistic to completely eliminate existing industrial sewing machines. Therefore, it is urgent to propose a component that can quickly transform the existing industrial sewing machine into one that can sew two chain belts on the corresponding two mattress fabrics at the same time.

[0004] In addition, the largest conventional mattress on the market is 220cmx220cm, but mattress fabrics vary in thickness, ranging from 10mm-80mm, depending on the material of the fabric. The conventional way to sew the four sides of mattress fabrics in factories is to use industrial sewing machines with manual assistance to feed and sew, and the sewing effect depends on the operator's proficiency, which has great limitations.

[0005] There is a feeding mechanism when sewing thin fabrics, but it is only suitable for thin fabrics. It is achieved by adding a pair of rollers directly behind the sewing needle of the sewing machine, pressing the fabrics respectively. The rotation speed of the roller surface is synchronized with the sewing speed of the sewing machine, so that the fabrics can be fed forward at the same sewing speed. A pair of rollers press the fabrics forward, and the contact between the rollers and the fabrics is only line contact, so it is only suitable for thin and light fabrics. For thicker fabrics, wrinkles are easily generated, affecting the stability of feeding. Summary of the invention

[0006] The technical problem to be solved by the embodiments of the present invention is to provide an industrial sewing machine that is easy to assemble. Under the premise of maintaining the linkage between the upper shaft and the lower shaft and the linkage between the transition shaft and the cloth feed shaft through the transmission parts, the transmission parts can be prevented from blocking the fabric, thereby achieving simultaneous sewing of the mattress fabric and both sides of the chain, improving the sewing efficiency, and ensuring the symmetry of the fabric on both sides, so that the zipper can open and close smoothly.

[0007] The technical problem to be solved by the embodiments of the present invention is to provide an industrial sewing machine that is easy to assemble and can be modified based on the existing industrial sewing machine with low investment, retaining the main structure of the existing industrial sewing machine, and is simple to modify, which complies with the national green environmental protection policy.

[0008] In order to solve the above technical problems, an embodiment of the present invention provides an industrial sewing machine that is easy to assemble, including a sewing machine head, a base, a feeding mechanism, an upper and lower shaft synchronization mechanism and a needle feed dog synchronization mechanism, wherein the up and down movement of the needle of the sewing machine head is driven by the upper shaft, and the forward and backward swing is driven by the feed shaft; the rotary shuttle of the base is driven by the lower shaft, and the feed dog is driven by the transition shaft; the upper shaft and the lower shaft are linked by the upper and lower shaft synchronization mechanism, and the feed shaft and the transition shaft are linked by the needle feed dog synchronization mechanism; the transmission paths of the upper and lower shaft synchronization mechanism and the needle feed dog synchronization mechanism both pass through the bracket behind the needle and the support seat on one side of the bracket; the feeding mechanism is arranged behind the needle for transmitting cloth.

[0009] As an improvement of the above-mentioned scheme, the upper and lower shaft synchronization mechanism includes a first transmission shaft, a second transmission shaft and a drive motor. The first transmission shaft is arranged on the side of the lower shaft and is parallel to the lower shaft. One end of the first transmission shaft is connected to the lower shaft through a synchronous belt, and the other end is connected to the second transmission shaft through the first synchronous belt; the second transmission shaft is arranged parallel to the top of the first transmission shaft, one end of the first transmission shaft is connected to the first transmission shaft, and the other end is connected to the upper shaft through the second synchronous belt; the drive motor is used to drive the lower shaft to rotate.

[0010] As an improvement of the above-mentioned scheme, the driving motor is arranged between the lower shaft and the first transmission shaft, connected to the lower shaft through a third synchronous belt, and connected to the first transmission shaft through a fourth synchronous belt; the industrial sewing machine is provided with a working platform, a lower supporting seat is provided at the bottom of the working platform, a lower bearing seat is provided on the lower supporting seat, and the first transmission shaft is installed on the lower bearing seat; the bracket is a vertically arranged supporting plate, and the supporting plate is arranged directly behind the machine needle.

[0011] As an improvement of the above solution, the support plate is provided with a groove, and the second synchronous belt is located in the groove; a protective cover is provided on the periphery of the support plate; and a guide cone surface is provided at the front end of the protective cover.

[0012] As an improvement of the above scheme, the needle feed dog synchronization mechanism includes a first lower hem shaft, a second lower hem shaft and an upper hem shaft which are parallel to each other, the first lower hem shaft is located below the transition shaft, the second lower hem shaft is located on the left and right sides of the first lower hem shaft, the upper hem shaft is located above the second lower hem shaft and on one side of the feed shaft, one end of the first lower hem shaft is connected to the transition shaft through a first connecting rod, the first lower hem shaft is connected to the second lower hem shaft through a second connecting rod, the second lower hem shaft is connected to the upper hem shaft through a third connecting rod, and the upper hem shaft is connected to the feed shaft through a fourth connecting rod;

[0013] A first swing piece is provided in the middle of the first lower swing shaft and the second lower swing shaft, and the second connecting rod is connected to the first swing piece; a fixed seat is provided at the lower part of the working platform, and the first lower swing shaft and the second lower swing shaft are arranged in the fixed seat; a second swing piece is provided at the end of the second lower swing shaft and the corresponding end of the upper swing shaft, and the third connecting rod is connected to the second swing piece; the cloth feeding shaft is connected to an adjustable connecting arm, and the fourth connecting rod is connected to the adjustable connecting arm.

[0014] As an improvement of the above scheme, a sliding groove is provided on the adjustable connecting arm, an adjustable slider is provided in the sliding groove, and the fourth connecting rod is hinged to the adjustable slider; an adjusting screw is also provided on the adjustable connecting arm, and the position of the adjustable slider in the sliding groove can be adjusted by rotating the adjusting screw; the adjusting screw includes an upper adjusting screw and a lower adjusting screw, the upper adjusting screw is abutted against the adjustable slider, and the lower adjusting screw is abutted against the hinge axis of the adjustable slider and the fourth connecting rod; the fourth connecting rod is arranged in the support seat; the second pendulum is located in the groove on the supporting plate.

[0015] As an improvement of the above scheme, the feeding mechanism is fixedly connected to the sewing machine head through a support seat, and comprises a lifting mechanism and a conveying mechanism. The conveying mechanism is installed on the support seat through the lifting mechanism, and the lifting mechanism can drive the conveying mechanism to rise and fall; the conveying mechanism comprises a side plate, a feeding motor, a rotating shaft, a pulley and a conveyor belt;

[0016] At least two rotating shafts are arranged on the side plate in parallel with each other, and the belt pulleys are arranged at both ends of the rotating shafts; and the conveyor belt is arranged on the belt pulley.

[0017] As an improvement of the above-mentioned scheme, the lifting mechanism includes an adjustable cylinder connected to the support seat and the side panel at the same time, a guide rail fixing seat connected to the side panel, and a linear guide rail vertically arranged on the support seat, and the guide rail fixing seat cooperates with the linear guide rail; the piston rod of the adjustable cylinder can be extended and retracted to drive the side panel to rise and fall relative to the support seat.

[0018] As an improvement of the above-mentioned scheme, the conveying mechanism also includes a tensioning mechanism, which is arranged at one end of the side plate and includes a tensioning seat, a tensioning bolt and a movable tensioning wheel. The tensioning wheel is in contact with the conveyor belt, and the tensioning force of the conveyor belt is adjusted by adjusting the total length of the conveyor belt; the tensioning seat is connected to the side plate through a guide bar, and a tensioning shaft is provided on the tensioning seat, and the tensioning shaft is provided on the tensioning wheel, and the conveyor belt is arranged around the tensioning wheel and the corresponding pulley; the tensioning bolt connects the tensioning seat and the side plate, and by rotating the tensioning bolt, the distance between the tensioning seat and the side plate can be adjusted, thereby adjusting the tensioning force of the conveyor belt.

[0019] As an improvement of the above solution, the base of the conveying mechanism is composed of two parallel side plates and a connecting plate connecting the two side plates, and an anti-wrinkle tensioning wheel is provided between the two side plates.

[0020] Implementing the embodiments of the present invention has the following beneficial effects:

[0021] By adopting the above structure, the transmission part of the main transmission shaft connecting the sewing machine head and the base can be placed in the bracket behind the needle. Under the premise of maintaining the linkage between the upper shaft and the lower shaft, and the linkage between the transition shaft and the cloth feed shaft, the transmission part can be prevented from blocking the fabric, so that the mattress fabric and both sides of the chain can be sewn simultaneously, thereby improving the sewing efficiency and ensuring the symmetry of the fabric on both sides, so that the zipper can open and close smoothly.

[0022] By adopting the above structure, the existing industrial sewing machine can be transformed with low investment, the main structure of the existing industrial sewing machine is retained, the transformation is simple, and it complies with the national green environmental protection policy.

[0023] The present invention adopts a symmetrical conveyor belt to clamp and transmit the fabric. Compared with roller feeding, the span is larger, the contact is changed from line to surface contact, and the feeding is more stable and accurate.

[0024] The invention can adjust the appropriate downward pressure stroke according to the fabric thickness and fabric material through the cooperation of the adjustable cylinder, the guide rail fixing seat and the linear guide rail, is suitable for fabrics with a thickness of 10mm-80mm, has a wide range of applications and powerful functions.

[0025] The wrinkle-proof tensioning wheel provided in the present invention can prevent wrinkles from being generated due to excessive resistance during the feeding process and affecting the sewing of the needle. The wrinkle-proof tensioning wheel can block the wrinkles generated by the fabric behind it, ensuring that the fabric between the wrinkle-proof tensioning wheel and the needle is smooth and tidy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic structural diagram of an industrial sewing machine that is easy to assemble according to the present invention;

[0027] Figure 2 It is a structural schematic diagram of the upper and lower shaft synchronization mechanism provided by the present invention;

[0028] Figure 3 yes Figure 2 AA surface section view;

[0029] Figure 4 It is a structural schematic diagram of the upper and lower shaft synchronization mechanism provided by the present invention from another perspective;

[0030] Figure 5 It is a structural schematic diagram of the needle feed dog synchronization mechanism provided by the present invention;

[0031] Figure 6-7 It is a structural schematic diagram of the needle feed dog synchronization mechanism provided by the present invention from another perspective;

[0032] Figure 8 yes Figure 6 Enlarged view of part A.

[0033] Fig. 9 It is a schematic diagram of the working state of the feeding mechanism provided by the present invention;

[0034] Fig.10 It is a structural schematic diagram of a first embodiment of a feeding mechanism provided by the present invention;

[0035] Fig.11 It is a schematic structural diagram of a second embodiment of the feeding mechanism provided by the present invention. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. It is hereby stated that the directional terms such as up, down, left, right, front, back, inside, outside, etc. that appear or will appear in the text of the present invention are only based on the accompanying drawings of the present invention, and are not specific limitations of the present invention.

[0037] like Figure 1-Figure 11 As shown, the present invention provides an industrial sewing machine that is easy to assemble, including a sewing machine head 81, a base 82, a feeding mechanism 8, an upper and lower shaft synchronization mechanism 3 and a needle feed dog synchronization mechanism 4, wherein the up and down movement of the needle of the sewing machine head 81 is driven by the upper shaft 31, and the forward and backward swing is driven by the feed shaft 41; the rotary shuttle of the base 82 is driven by the lower shaft 32, and the feed dog is driven by the transition shaft 42; the upper shaft 31 and the lower shaft 32 are linked by the upper and lower shaft synchronization mechanism 3, and the feed shaft 41 and the transition shaft 42 are linked by the needle feed dog synchronization mechanism 4; the transmission paths of the upper and lower shaft synchronization mechanism 3 and the needle feed dog synchronization mechanism 4 both pass through the bracket 5 behind the needle 83 and the support seat 6 on one side of the bracket 5; the feeding mechanism 8 is arranged behind the needle for transmitting cloth.

[0038] By adopting the above structure, the transmission part of the main transmission shaft connecting the sewing machine head and the base can be placed in the bracket behind the needle. Under the premise of maintaining the linkage between the upper shaft and the lower shaft, and the linkage between the transition shaft and the cloth feed shaft, the transmission part can be prevented from blocking the fabric, so that the mattress fabric and both sides of the chain can be sewn simultaneously, thereby improving the sewing efficiency and ensuring the symmetry of the fabric on both sides, so that the zipper can open and close smoothly.

[0039] By adopting the above structure, the existing industrial sewing machine can also be modified with low investment, the main structure of the existing industrial sewing machine is retained, the modification is simple, and it complies with the national green environmental protection policy.

[0040] Specifically, the upper and lower shaft synchronization mechanism 3 includes a first transmission shaft 33, a second transmission shaft 34, a driving motor 351, a bracket 5 and a support seat 6. The first transmission shaft 33 is arranged on the side of the lower shaft 32 and is parallel to the lower shaft 32. One end of the first transmission shaft 33 is connected to the lower shaft 32 through a synchronous belt, and the other end is connected to the second transmission shaft 34 through a first synchronous belt 35. The second transmission shaft 34 is arranged above the first transmission shaft 33 in parallel, one end of the second transmission shaft 34 is connected to the first transmission shaft 33, and the other end is connected to the upper shaft 31 through a second synchronous belt 36. The driving motor 351 is used to drive the lower shaft 32 to rotate. The lower shaft 32, the first transmission shaft 33, the second transmission shaft 34 and the upper shaft 31 are all provided with synchronous wheels 37, and the corresponding synchronous belts are arranged on the corresponding synchronous wheels 37.

[0041] The transmission principle is as follows: the lower shaft 32 is connected to the first transmission shaft 33 through a synchronous belt to transmit the rotational power to the side of the base 82; the first transmission shaft 33 is connected to the second transmission shaft 34 through a first synchronous belt 35 to transmit the rotational power upward; the second transmission shaft 34 is also connected to the upper shaft 31 through a second synchronous belt 36 to transmit the rotational power horizontally to the upper shaft 31 in the sewing machine head 81. The drive motor 351 can be connected to the upper shaft 31, the lower shaft 32, the first transmission shaft 33 or the second transmission shaft 34 to provide rotational power. In this embodiment, the drive motor 351 is arranged between the lower shaft 32 and the first transmission shaft 33, connected to the lower shaft 32 through the third synchronous belt 38, and connected to the first transmission shaft 33 through the fourth synchronous belt 39. The drive motor 351 drives the lower shaft 32 and the first transmission shaft 33 through the third synchronous belt 38 and the fourth synchronous belt 39 respectively. When the drive motor 351 rotates, the lower shaft 32 and the first transmission shaft 33 rotate synchronously.

[0042] In order to facilitate the transformation and maximize the use of the existing structure, the present application utilizes the working platform 84 provided on the base 82 of the industrial sewing machine, and sets a lower support seat 85 at the bottom of the working platform 84. The lower support seat 85 is provided with a lower bearing seat 86, and the first transmission shaft 33 is installed on the lower bearing seat 86.

[0043] In order to minimize the obstruction of the support 5 to the fabric, the support 5 is a vertically arranged support plate 51, and the support plate 51 is arranged directly behind the needle. After the chain belt is sewn to the fabric, the chain belts on both sides can be separated again, so as to pass over the rear support plate 51. The support plate 51 is provided with a groove 511, and the second synchronous belt 36 is located in the groove 511 to prevent the fabric from contacting the movable parts in the support plate 51. Preferably, a shield 52 is provided on the periphery of the support plate 51, and a guide cone 521 is provided at the front end of the shield 52. The sewn mattress fabric is separated by the guide cone 521 to make the discharge smoother.

[0044] Preferably, a tensioning mechanism is provided on the fourth synchronous belt 39. The tensioning mechanism comprises a tensioning wheel 30, which is mounted on a swing arm, and a spring is provided inside the swing arm, so that the tensioning wheel 30 applies a constant pressure to the fourth synchronous belt 39 to keep the fourth synchronous belt 39 taut.

[0045] Combination Figure 5-Figure 8 The needle feed dog synchronization mechanism 4 includes a first lower swing shaft 49, a second lower swing shaft 48 and an upper swing shaft 43 which are parallel to each other. The first lower swing shaft 49 is located below the transition shaft 42, the second lower swing shaft 48 is located on the left and right sides of the first lower swing shaft 49, the upper swing shaft 43 is located above the second lower swing shaft 48 and on the side of the cloth feed shaft 41, one end of the first lower swing shaft 49 is connected to the transition shaft 42 through a first connecting rod 44, the first lower swing shaft 49 is connected to the second lower swing shaft 48 through a second connecting rod 45, the second lower swing shaft 48 is connected to the upper swing shaft 43 through a connecting rod, and the upper swing shaft 43 is connected to the cloth feed shaft 41 through a third connecting rod 46. The transmission mechanism of the needle feed dog synchronization mechanism 4 is composed of a swing shaft and a connecting rod, which reduces the types of parts required for modification and facilitates assembly.

[0046] Preferably, a first swing member 401 is provided in the middle of the first lower swing shaft 49 and the second lower swing shaft 48, and the second connecting rod 45 is connected to the first swing member 401.

[0047] In order to match with the existing industrial sewing machine, the lower part of the working platform 84 is provided with a fixing seat 88, and the first lower swing shaft 49 and the second lower swing shaft 48 are arranged in the fixing seat 88. The end of the upper swing shaft 43 is provided with a second swing piece 402, and the connecting rod is connected to the second swing piece 402. Similarly, in order to minimize the obstruction of the bracket 5 to the fabric, the second swing piece 402 is located in the groove 511 of the support plate 51.

[0048] In order to match the angle deviation of the cloth feeding shaft 41 and the transition shaft 42 of different models, the cloth feeding shaft 41 is connected to an adjustable connecting arm 7, and the third connecting rod 46 is connected to the adjustable connecting arm 7. Specifically, a third swing piece 47 is provided at the end of the upper swing shaft 43, one end of the third connecting rod 46 is hinged to the third swing piece 47, and the other end is hinged to the adjustable slider 71. A sliding groove 72 is provided on the adjustable connecting arm 7, and an adjustable slider 71 is provided in the sliding groove 72, and the third connecting rod 46 is hinged to the adjustable slider 71; an adjusting screw is also provided on the adjustable connecting arm 7, and the position of the adjustable slider 71 in the sliding groove 72 can be adjusted by rotating the adjusting screw. The adjusting screw includes an upper adjusting screw 73 and a lower adjusting screw 74, the upper adjusting screw 73 abuts against the adjustable slider 71, and the lower adjusting screw 74 abuts against the hinge shaft 75 of the adjustable slider 71 and the third connecting rod 46.

[0049] Their transmission principles are as follows: Figure 5 As shown, the transition shaft 42 is connected to the first lower swing shaft 49 through the first connecting rod 44. When the transition shaft 42 rotates a certain angle, the first lower swing shaft 49 rotates a certain angle synchronously. Figure 6 As shown, the first lower swing shaft 49 and the second lower swing shaft 48 are arranged on the connecting seat at the lower part of the base 82, and the first swing member 401 is arranged in the middle of them. The second connecting rod 45 is connected to the first swing member 401. When the first lower swing shaft 49 rotates a certain angle, the second lower swing shaft 48 rotates synchronously by the same angle. Figure 7 As shown, in order to hide the vertically arranged connecting rod in the bracket 5, a transfer shaft 421 is further arranged between the second lower swing shaft 48 and the upper swing shaft 43. The transfer shaft 421 passes through the support plate 51, one end of which is connected to the second lower swing shaft 48 through the fourth connecting rod 422, and the other end is connected to the upper swing shaft 43 through the fifth connecting rod 423. The transfer shaft 421 is located in the groove 511 of the support plate 51. When the second lower swing rod rotates a certain angle, the upper swing shaft 43 is synchronously rotated by the same angle through the transfer effect of the transfer shaft 421. Figure 8 As shown, the upper swing shaft 43 is connected to the adjustable connecting arm 7 on the cloth feed shaft 41 through the third connecting rod 46. By adjusting the upper adjusting screw 73 and the lower adjusting screw 74, the position of the adjustable slider 71 in the slide groove 72 can be adjusted so that the initial rotation angle of the upper swing shaft 43 and the cloth feed shaft 41 meets the working requirements.

[0050] like Fig. 9 and Fig.10 As shown, the feeding mechanism is fixedly connected to the sewing machine head 81 through the support seat 6, and includes a lifting mechanism 1 and a conveying mechanism 2. The conveying mechanism 2 is installed on the support seat 6 through the lifting mechanism 1, and the lifting mechanism 1 can drive the conveying mechanism 2 to rise and fall; the conveying mechanism 2 includes a side plate 21, a feeding motor 22, a rotating shaft (23a, 23b), a pulley 24 and a conveyor belt 25;

[0051] At least two rotating shafts (23a, 23b) are arranged parallel to each other on the side plate 21, and the pulleys 24 are arranged at both ends thereof; a conveyor belt 25 is arranged on the pulley 24. The sewing machine head 81 can be a common main component for sewing, which drives a sewing needle with sewing thread to repeatedly pass through the fabric to sew the fabric.

[0052] This embodiment uses a symmetrical conveyor belt 25 to clamp and transmit the fabric. Compared with roller feeding, its span is larger, and the contact is changed from line to surface contact, so the feeding is more stable and accurate.

[0053] The lifting mechanism 1 includes a guide rail fixing seat 11 connected to the side plate 21, and a linear guide rail 12 vertically arranged on the support seat 6, and the guide rail fixing seat 11 cooperates with the linear guide rail 12. The lifting mechanism 1 also includes an adjustable cylinder 13 connected to the support seat 6 and the side plate 21 at the same time, and the piston rod of the adjustable cylinder 13 can be extended to drive the side plate 21 to rise and fall relative to the support seat 6. Through the cooperation of the adjustable cylinder 13, the guide rail fixing seat 11 and the linear guide rail 12, the appropriate downward stroke can be adjusted according to the thickness and material of the fabric, and the fabric thickness is 10mm-80mm. It has a wide range of applications and powerful functions.

[0054] The base of the conveying mechanism 2 is composed of two parallel side plates 21 and a connecting plate 26 connecting the two side plates 21. The feeding motor 22 is fixed on the base, connected to the rotating shaft 23a through a belt 27, and drives the conveyor belt 25 to rotate through the rotating shaft 23a and the pulley 24.

[0055] Preferably, an anti-wrinkle tension wheel 28 is provided between the two side panels 21. The anti-wrinkle tension wheel 28 is provided in the rotating shaft 23b located in the front, and can rotate synchronously with the rotating shaft 23b. The anti-wrinkle tension wheel 28 is provided directly behind the sewing needle, and the two conveyor belts 25 are located on both sides of the anti-wrinkle tension wheel 28. The anti-wrinkle tension wheel 28 can prevent wrinkles from being generated during the feeding process due to excessive resistance, which affects the sewing of the sewing needle. The anti-wrinkle tension wheel 28 can block the wrinkles generated by the fabric behind it, ensuring that the fabric between the anti-wrinkle tension wheel 28 and the sewing needle is smooth and neat.

[0056] Preferably, the conveyor belt 25 is further provided with an auxiliary pressure wheel 29 to ensure that the lower conveyor belt 25 as a whole applies a relatively uniform pressure to the fabric, making the transmission more stable.

[0057] Combination Fig.11According to the second embodiment of the present invention, the difference from the first embodiment is that, in order to ensure that the conveyor belt 25 remains tensioned during long-term use, the conveying mechanism 2 further includes a tensioning mechanism 9. The tensioning mechanism 9 is arranged at one end of the side plate 21, and includes a movable tensioning wheel 91, the tensioning wheel 91 is in contact with the conveyor belt 25, and the tension of the conveyor belt 25 is adjusted by adjusting the total length of the conveyor belt 25. Specifically, the tensioning mechanism 9 also includes a tensioning seat 92, the tensioning seat 92 is connected to the side plate 21 through a guide bar 93, a tensioning shaft 94 (which replaces the shaft 23a in the first embodiment) is provided on the tensioning seat 92, the tensioning shaft 94 is provided with the tensioning wheel 91, and the conveyor belt 25 is arranged around the tensioning wheel 91 and the corresponding pulley 24. The guide bar 93 is provided with a strip-shaped connecting hole 931, and the tensioning seat 92 can be fixed at different positions of the connecting hole 931 by bolts. The tensioning seat 92 is also provided with a tensioning bolt 95 , and the tensioning bolt 95 connects the tensioning seat 92 and the side plate 21 . By rotating the tensioning bolt 95 , the distance between the tensioning seat 92 and the side plate 21 can be adjusted, thereby adjusting the tension of the conveyor belt 25 .

[0058] The feeding motor 22 is arranged above the tensioning seat 92, and the feeding motor 22 is fixed on the base and connected to the tensioning shaft 94 through a belt 27. During the adjustment process of the tensioning seat 92, the tensioning shaft 94 will be moved away from or close to the base. The tensioning shaft 94 and the feeding motor 22 are connected by the belt 27, which allows the tensioning shaft 94 to move to a certain extent to meet the adjustment requirements.

[0059] The above is a preferred embodiment of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. An industrial sewing machine that is easy to assemble, characterized in that: It includes a sewing machine head, a base, a feeding mechanism, an upper and lower shaft synchronization mechanism and a needle feed dog synchronization mechanism. The upper and lower movement of the needle of the sewing machine head is driven by the upper shaft, and the forward and backward swing is driven by the feed shaft; the rotary shuttle of the base is driven by the lower shaft, and the feed dog is driven by the transition shaft; the upper shaft and the lower shaft are linked by the upper and lower shaft synchronization mechanism, and the feed shaft and the transition shaft are linked by the needle feed dog synchronization mechanism; the transmission paths of the upper and lower shaft synchronization mechanism and the needle feed dog synchronization mechanism both pass through the bracket behind the needle and the support seat on one side of the bracket; the feeding mechanism is arranged behind the needle and is used to transmit cloth; The upper and lower shaft synchronization mechanism includes a first transmission shaft, a second transmission shaft and a driving motor. The first transmission shaft is arranged on the side of the lower shaft and is parallel to the lower shaft. One end of the first transmission shaft is connected to the lower shaft through a synchronous belt, and the other end is connected to the second transmission shaft through the first synchronous belt. The second transmission shaft is arranged above the first transmission shaft in parallel, one end of the second transmission shaft is connected to the first transmission shaft, and the other end is connected to the upper shaft through the second synchronous belt. The driving motor is used to drive the lower shaft to rotate. The driving motor is arranged between the lower shaft and the first transmission shaft, connected to the lower shaft through the third synchronous belt, and connected to the first transmission shaft through the fourth synchronous belt; the industrial sewing machine which is easy to assemble is provided with a working platform, a lower support seat is provided at the bottom of the working platform, a lower bearing seat is provided on the lower support seat, and the first transmission shaft is installed on the lower bearing seat; the bracket is a vertically arranged support plate, and the support plate is arranged directly behind the machine needle; The support plate is provided with a groove, and the second synchronous belt is located in the groove; a shield is provided on the periphery of the support plate; and a guide cone is provided at the front end of the shield; The needle feed dog synchronization mechanism comprises a first lower hem shaft, a second lower hem shaft and an upper hem shaft which are parallel to each other, wherein the first lower hem shaft is located below the transition shaft, the second lower hem shaft is located on the left and right sides of the first lower hem shaft, the upper hem shaft is located above the second lower hem shaft and on one side of the feed shaft, one end of the first lower hem shaft is connected to the transition shaft via a first connecting rod, the first lower hem shaft is connected to the second lower hem shaft via a second connecting rod, the second lower hem shaft is connected to the upper hem shaft via a third connecting rod, and the upper hem shaft is connected to the feed shaft via a fourth connecting rod; A first swing piece is provided in the middle of the first lower swing shaft and the second lower swing shaft, and the second connecting rod is connected to the first swing piece; a fixing seat is provided at the lower part of the working platform, and the first lower swing shaft and the second lower swing shaft are arranged in the fixing seat; a second swing piece is provided at the end of the second lower swing shaft and the corresponding end of the upper swing shaft, and the third connecting rod is connected to the second swing piece; the cloth feeding shaft is connected to an adjustable connecting arm, and the fourth connecting rod is connected to the adjustable connecting arm; The adjustable connecting arm is provided with a slide groove, an adjustable slider is provided in the slide groove, and the fourth connecting rod is hinged to the adjustable slider; the adjustable connecting arm is also provided with an adjusting screw, and the position of the adjustable slider in the slide groove can be adjusted by rotating the adjusting screw; the adjusting screw includes an upper adjusting screw and a lower adjusting screw, the upper adjusting screw abuts against the adjustable slider, and the lower adjusting screw abuts against the hinge shaft of the adjustable slider and the fourth connecting rod; the fourth connecting rod is arranged in the supporting seat; the second pendulum is located in the groove on the supporting plate; The feeding mechanism is fixedly connected to the sewing machine head through a support seat, and comprises a lifting mechanism and a conveying mechanism. The conveying mechanism is installed on the support seat through the lifting mechanism, and the lifting mechanism can drive the conveying mechanism to rise and fall; the conveying mechanism comprises a side plate, a feeding motor, a rotating shaft, a pulley and a conveyor belt; At least two rotating shafts are arranged on the side plate in parallel with each other, and the belt pulleys are arranged at both ends of the rotating shafts; and the conveyor belt is arranged on the belt pulley.

2. The easy-to-assemble industrial sewing machine according to claim 1, characterized in that: The lifting mechanism includes an adjustable cylinder connected to the support seat and the side plate at the same time, a guide rail fixing seat connected to the side plate, and a linear guide rail vertically arranged on the support seat, and the guide rail fixing seat cooperates with the linear guide rail; the piston rod of the adjustable cylinder can be extended and retracted to drive the side plate to rise and fall relative to the support seat.

3. The easy-to-assemble industrial sewing machine according to claim 2, characterized in that: The conveying mechanism also includes a tensioning mechanism, which is arranged at one end of the side plate and includes a tensioning seat, a tensioning bolt and a movable tensioning wheel. The tensioning wheel is in contact with the conveyor belt, and the tensioning force of the conveyor belt is adjusted by adjusting the total length of the conveyor belt; the tensioning seat is connected to the side plate through a guide bar, and a tensioning shaft is provided on the tensioning seat, and the tensioning wheel is provided on the tensioning shaft, and the conveyor belt is arranged around the tensioning wheel and the corresponding pulley; the tensioning bolt connects the tensioning seat and the side plate, and the distance between the tensioning seat and the side plate can be adjusted by rotating the tensioning bolt, thereby adjusting the tensioning force of the conveyor belt.

4. The easy-to-assemble industrial sewing machine according to claim 1, characterized in that: The base of the conveying mechanism is composed of two side plates arranged in parallel and a connecting plate connecting the two side plates, and an anti-wrinkle tensioning wheel is arranged between the two side plates.

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