A gauge differential adjustment structure

Abstract

The application discloses a needle pitch differential adjustment structure, which comprises a needle pitch adjustment structure and a differential adjustment structure. The needle pitch adjustment structure is composed of a needle pitch motor shaft, a cloth feeding shaft and a needle pitch connecting rod to form a crank rocker mechanism, the stroke of a sliding block on a cloth feeding crank is adjusted through a sliding groove, and needle pitch adjustment is realized. The differential adjustment structure is composed of a differential motor shaft, a differential shaft and a differential connecting rod to form another crank rocker mechanism, the differential connecting piece is controlled by a differential crank to drive the movement of a differential cloth feeding frame. The feeding shaft drives a driving cloth feeding frame through a connecting rod transmission mechanism, and synchronous cloth feeding is realized in cooperation with a tooth lifting sliding block on a main shaft. The structure adopts an encoder to monitor the motor rotation angle in real time, intelligently adjusts the needle pitch and the differential amount, is suitable for different fabric sewing requirements, and has the characteristics of accurate adjustment and stable operation.

Description

Technical Field

[0001] This utility model relates to the field of sewing machine technology, and more specifically, to a differential stitch length adjustment structure. Background Technology

[0002] Different fabrics require sewing machines with varying stitch lengths and differential adjustments depending on the sewing requirements. Current sewing machines primarily adjust stitch length by manually engaging the needle shaft into its slot while the machine is stopped, and by using a differential wrench to adjust the differential position. However, the magnitude of the stitch length differential is not readily apparent to the user, requiring repeated adjustments to achieve the desired result. Therefore, adjustments in existing sewing machines are relatively cumbersome and inconvenient.

[0003] Chinese Patent Publication No. CN106012337A, published on October 12, 2016, discloses an invention entitled "Stitch Pitch and Differential Adjustment Mechanism and Sewing Machine." This application discloses a stitch pitch and differential adjustment structure, which mainly relies on manual operation of a first manual adjustment structure and a second manual adjustment structure to adjust the stitch pitch and differential ratio. Therefore, the operation is extremely cumbersome and complex. Utility Model Content

[0004] This invention overcomes the shortcomings of existing technologies that mainly rely on manual adjustment of stitch length and differential, and provides a stitch length differential adjustment structure. Through the cooperation of a motor and a mechanical transmission structure, it can intelligently adjust the stitch length and differential size. When adjusting different fabrics, customers can quickly select the appropriate stitch length differential size to match the fabric, avoiding repeated adjustments. The adjustment is more convenient and the use is also more convenient.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a needle pitch differential adjustment structure, comprising:

[0006] The stitch pitch adjustment structure includes a feed shaft, a stitch pitch motor shaft, and a stitch pitch connecting rod; one end of the feed crank is connected to the feed shaft, and the other end is rotatably connected to a control crank. The control crank is provided with a groove, and a slider is provided in the groove. The slider is connected to the feed connecting rod assembly.

[0007] The differential adjustment structure includes a differential shaft, a differential motor shaft, and a differential connecting rod; one end of the differential crank is fixedly connected to the differential shaft, and the other end is connected to the differential connecting plate.

[0008] In this application, the above structure uses the needle pitch motor shaft as the main crank, the feed shaft as the driven rocker, and the needle pitch connecting rod as the transmission connecting rod, forming a crank-rocker mechanism. Under the action of the needle pitch adjusting motor, the feed shaft can be driven to rotate, thereby controlling the movement position of the slide groove on the feed crank, and thus controlling the stroke of the slider, thereby achieving the function of adjusting the needle pitch. Furthermore, in the above differential adjustment structure, a crank-rocker mechanism is formed with the differential motor shaft as the driving crank, the differential shaft as the driven rocker, and the differential connecting rod as the transmission connecting rod. Under the action of the differential adjusting motor, the differential shaft can be driven to rotate, thereby controlling the rotation angle of the differential crank, and thus controlling the rotation amplitude of the differential connecting piece, achieving differential adjustment.

[0009] In addition, encoders are installed on both the stitch length adjustment motor and the differential adjustment motor, which can read the rotation angle of the stitch length motor shaft and the differential motor shaft in real time. This allows for real-time determination of the position of the overall stitch length differential and displays it on the control panel for intelligent adjustment of the stitch length and differential size. This enables customers to quickly select the appropriate stitch length differential size to match different fabrics.

[0010] Preferably, the needle pitch motor shaft is provided with a needle pitch eccentric shaft section, the feed shaft is provided with a feed feed eccentric shaft section, and the two ends of the needle pitch connecting rod are respectively sleeved with the needle pitch eccentric shaft section and the feed feed eccentric shaft section; one end of the feed feed crank is sleeved on the feed feed shaft.

[0011] By setting a needle pitch eccentric section on the needle pitch motor shaft and a feed eccentric section on the feed shaft, a stable rotation structure can be formed, making the overall structure more precisely controlled by the needle pitch adjustment motor.

[0012] Preferably, the differential motor shaft is provided with an output eccentric shaft section, and the differential shaft is provided with a differential eccentric shaft section; the two ends of the differential connecting rod are respectively sleeved with the output eccentric shaft section and the differential eccentric shaft section.

[0013] By setting an output eccentric shaft section on the differential motor shaft and a differential eccentric shaft section on the differential shaft, the overall structure controlled by the differential adjustment motor can be made more precise.

[0014] Preferably, the assembly also includes a main shaft, an active feeder, and a differential feeder; the feed linkage assembly includes a feed linkage, a feed crank, and a feed shaft; one end of the feed linkage is rotatably connected to the main shaft, and the other end of the feed linkage is rotatably connected to the feed crank and fixedly provided with a slider; the end of the feed crank away from the feed linkage is fixedly connected to the feed shaft.

[0015] The main shaft is equipped with a main journal, and one end of the feeding connecting rod is rotatably mounted on the main journal. Driven by the main shaft, the feeding connecting rod reciprocates. When the feeding connecting rod moves, it drives the feeding crank to swing, which in turn drives the feeding shaft to rotate. The feeding shaft then drives the active fabric feeding frame to move.

[0016] Preferably, the end of the control crank away from the slide is provided with an open long groove, and the feed shaft is slidably disposed in the open long groove.

[0017] The above structure can control the feeding shaft to slide along the open long groove, so that the feeding shaft can slide at a specific angle, making the movement of the feeding shaft more stable and improving the stability of the control needle pitch.

[0018] Preferably, a first connecting rod is fixedly installed on the feeding shaft, a first sliding groove is provided on the first connecting rod, and a first sliding shaft is provided in the first sliding groove; the first sliding shaft is rotatably connected to one end of the second connecting rod, and the end of the second connecting rod away from the first sliding shaft is rotatably connected to the active feeding frame; the end of the active feeding frame is provided with an active feeding tooth.

[0019] During the rotation of the feeding shaft, the first connecting rod is driven to rotate. The first connecting rod drives the second connecting rod to rotate through the first sliding shaft. The second connecting rod then drives the active fabric feeding frame to move, thus realizing the function of moving the fabric during the sewing process.

[0020] Preferably, a differential dividing rod is fixedly installed on the feeding crank; a differential slide groove is provided on the differential feeding frame, and a differential slider is provided in the differential slide groove; a transition block is rotatably connected to the end of the differential connecting piece away from the differential crank, and a transition groove is provided through the transition block, and the differential dividing rod is slidably installed in the transition groove; the side of the transition block away from the differential connecting piece is rotatably connected to the differential slider.

[0021] Under the action of the differential adjustment motor, the differential shaft can be driven to rotate, thereby controlling the rotation angle of the differential crank, and thus controlling the rotation amplitude of the differential connecting plate. This causes the slider located at the end of the differential connecting plate to move in the horizontal direction, thereby driving the differential fabric feeding frame to move, thus realizing the function of differential control.

[0022] Preferably, the transition block is provided with a first transition shaft and a second transition shaft on both sides of the transition groove; the first transition shaft is rotatably connected to the differential slider, and the second transition shaft is rotatably connected to the differential connecting piece.

[0023] The structure of the transition block enables the rotation of the differential connecting piece to drive the driven fabric feeding frame and control the position of the feeding shaft, thereby realizing the function of differential control.

[0024] Preferably, the active feeder and the differential feeder are arranged in parallel, and both the active feeder and the differential feeder are provided with grooves. A tooth-lifting slider is provided on the main shaft and located in the groove. The tooth-lifting slider is eccentrically connected to the main shaft.

[0025] During the operation of the sewing machine, the main shaft rotates, which drives the lifting slider to rotate, thereby driving the differential feed frame and the active feed frame to swing, thus controlling the movement of the differential feed dog and the active feed dog.

[0026] Preferably, the active feed frame and the differential feed frame are arranged in parallel, and both the active feed frame and the differential feed frame have open slots at their ends; an eccentric pin is provided on the machine housing, and a sliding column is provided at the end of the eccentric pin, which is slidably disposed in the open slots of the active feed frame and the differential feed frame.

[0027] The eccentric pin is fixedly mounted on the machine housing. The sliding column can rotate around the end of the eccentric pin. The sliding column has a square structure and can cooperate with the open slot to limit and guide the active and differential fabric feeding frames.

[0028] Compared with the prior art, the beneficial effects of this utility model are:

[0029] (1) A crank-rocker mechanism is formed by using the needle pitch motor shaft as the main crank, the feed shaft as the driven rocker, and the needle pitch connecting rod as the transmission connecting rod. Under the action of the needle pitch adjusting motor, the feed shaft can be driven to rotate, thereby controlling the movement position of the slide groove on the feed crank, and thus controlling the stroke of the slider, thereby achieving the function of adjusting the needle pitch. In addition, in the above differential adjustment structure, a crank-rocker mechanism is formed with the differential motor shaft as the driving crank, the differential shaft as the driven rocker, and the differential connecting rod as the transmission connecting rod. Under the action of the differential adjusting motor, the differential shaft can be driven to rotate, thereby controlling the rotation angle of the differential crank, and thus controlling the rotation amplitude of the differential connecting plate, thereby realizing differential adjustment.

[0030] (2) Both the needle pitch adjustment motor and the differential adjustment motor are equipped with encoders, which can read the rotation angle of the needle pitch motor shaft and the differential motor shaft in real time, thereby realizing the real-time judgment of the position of the needle pitch differential of the whole machine and displaying it on the control panel for intelligent adjustment of needle pitch and differential size. This allows customers to quickly select the corresponding needle pitch differential size to match the fabric when adjusting different fabrics. Attached Figure Description

[0031] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0032] Figure 2 This is a three-dimensional structural diagram of the differential adjustment structure of this utility model.

[0033] Figure 3 This is a three-dimensional structural diagram of the needle spacing adjustment structure of this utility model.

[0034] Figure 4 This is a three-dimensional structural diagram of the present invention from another angle.

[0035] Figure 5 This is a three-dimensional structural diagram of the present invention from another angle.

[0036] In the figure: 1. Stitch pitch adjustment structure, 11. Stitch pitch adjustment motor, 12. Feeding shaft, 121. Feeding eccentric shaft section, 13. Stitch pitch motor shaft, 131. Stitch pitch eccentric shaft section, 14. Stitch pitch connecting rod, 15. Feeding crank, 16. Control crank, 161. Slide groove, 162. Open long groove.

[0037] 2. Differential adjustment structure, 21. Differential adjustment motor, 22. Differential shaft, 221. Differential eccentric shaft section, 23. Differential motor shaft, 231. Output eccentric shaft section, 24. Differential connecting rod, 25. Differential crank, 26. Differential connecting plate;

[0038] 3. Feeding linkage assembly; 31. Slider; 32. Feeding linkage; 33. Feeding crank; 331. Differential rod; 34. Feeding shaft;

[0039] 4. Main spindle; 41. Tooth lifting slider;

[0040] 5. Active fabric feeder; 51. Active fabric feed dog; 52. Groove; 53. Opening groove;

[0041] 6. Differential feed frame; 61. Differential feed teeth; 62. Differential chute; 63. Differential slider; 64. Transition block; 641. Transition groove; 642. Second transition shaft.

[0042] 7. Linkage transmission mechanism, 71. First link, 711. First slide groove, 72. Second link, 721. First slide shaft;

[0043] 8. Eccentric pin; 81. Sliding column. Detailed Implementation

[0044] The technical solution of this utility model will be further described in detail below through specific embodiments and with reference to the accompanying drawings:

[0045] Example 1: Refer to Figures 1 to 5 As shown, a differential adjustment structure for needle pitch includes:

[0046] The stitch pitch adjustment structure 1 includes a stitch pitch adjustment motor 11, a feed shaft 12, a stitch pitch motor shaft 13, and a stitch pitch connecting rod 14. The output end of the stitch pitch adjustment motor 11 is provided with the stitch pitch motor shaft 13. One end of the feed crank 15 is connected to the feed shaft 12, and the other end is rotatably connected to the control crank 16. The control crank 16 is provided with a slide groove 161, and a slider 31 is provided in the slide groove 161. The slider 31 is connected to the feed connecting rod assembly 3.

[0047] The differential adjustment structure 2 includes a differential adjustment motor 21, a differential shaft 22, a differential motor shaft 23, and a differential connecting rod 24. The output end of the differential adjustment motor 21 is provided with the differential motor shaft 23. One end of the differential crank 25 is fixedly connected to the differential shaft 22, and the other end is connected to the differential connecting piece 26.

[0048] In this application, the above structure uses the needle pitch motor shaft 13 as the driving crank, the feed shaft 12 as the driven rocker, and the needle pitch connecting rod 14 as the transmission connecting rod to form a crank-rocker mechanism. Under the action of the needle pitch adjusting motor 11, the feed shaft 12 can be driven to rotate, thereby controlling the movement position of the slide groove 161 on the feed crank 15, and thus controlling the sliding stroke of the slider 31, thereby achieving the function of adjusting the needle pitch. In addition, in the above differential adjustment structure 2, a crank-rocker mechanism is formed with the differential motor shaft 23 as the driving crank, the differential shaft 22 as the driven rocker, and the differential connecting rod 24 as the transmission connecting rod. Under the action of the differential adjusting motor 21, the differential shaft 22 can be driven to rotate, thereby controlling the rotation angle of the differential crank 25, and thus controlling the rotation amplitude of the differential connecting piece 26, thereby realizing differential adjustment.

[0049] In one embodiment, a needle pitch eccentric shaft section 131 is provided on the needle pitch motor shaft 13, and a feed eccentric shaft section 121 is provided on the feed shaft 12. The two ends of the needle pitch connecting rod 14 are respectively sleeved with the needle pitch eccentric shaft section 131 and the feed eccentric shaft section 121; one end of the feed crank 15 is sleeved on the feed shaft 12.

[0050] By setting a needle pitch eccentric section 131 on the needle pitch motor shaft 13 and a feeding eccentric section 121 on the feeding shaft 12, a stable rotation structure can be formed, making the overall structure more accurately controlled by the needle pitch adjustment motor 11.

[0051] In one embodiment, the differential motor shaft 23 is provided with an output eccentric shaft section 231, and the differential shaft 22 is provided with a differential eccentric shaft section 221; the two ends of the differential connecting rod 24 are respectively sleeved with the output eccentric shaft section 231 and the differential eccentric shaft section 221.

[0052] By setting an output eccentric shaft section 231 on the differential motor shaft 23 and a differential eccentric shaft section 221 on the differential shaft 22, the overall structure can be controlled more precisely by the differential adjustment motor 21.

[0053] In one embodiment, the assembly further includes a main shaft 4, an active feed frame 5, and a differential feed frame 6. The active feed frame 5 is provided with an active feed tooth 51 at its end, and the differential feed frame 6 is provided with a differential feed tooth 61 at its end. The feeding linkage assembly 3 includes a feeding linkage 32, a feeding crank 33, and a feeding shaft 34. One end of the feeding linkage 32 is rotatably connected to the main shaft 4, and the other end of the feeding linkage 32 is rotatably connected to the feeding crank 33 and has a slider 31 fixedly mounted thereon. The end of the feeding crank 33 away from the feeding linkage 32 is fixedly connected to the feeding shaft 34.

[0054] A main shaft journal is provided on the main shaft 4. One end of the feeding connecting rod 32 is rotatably mounted on the main shaft journal. Driven by the main shaft 4, the feeding connecting rod 32 reciprocates. When the feeding connecting rod 32 moves, it drives the feeding crank 33 to swing, which in turn drives the feeding shaft 34 to rotate. The feeding shaft 34 then drives the active fabric feeding frame 5 to move. Therefore, under the action of the stitch length adjustment motor 11, the feeding shaft 12 can be driven to rotate, thereby controlling the moving position of the slide groove 161 on the feeding crank 15, and thus controlling the sliding stroke of the slider 31. This controls the swing amplitude of the feeding shaft 34, thereby controlling the moving distance of the active fabric feeding frame 5, and thus controlling the distance of the active fabric feeding teeth 51, thereby achieving the function of adjusting the stitch length.

[0055] In one embodiment, an open long groove 162 is provided at the end of the control crank 16 away from the slide groove 161, and the feed shaft 34 is slidably disposed within the open long groove 162. With the above structure, the feed shaft 34 can be controlled to slide along the open long groove 162, so that the feed shaft 34 can slide at a specific angle, making the movement of the feed shaft 34 more stable and improving the stability of the control needle pitch.

[0056] In one embodiment, the feeding shaft 34 drives the active fabric feeding frame 5 to move via a linkage transmission mechanism 7. The linkage transmission mechanism 7 includes a first connecting rod 71 fixedly mounted on the feeding shaft 34, a first sliding groove 711 provided on the first connecting rod 71, and a first sliding shaft 721 provided in the first sliding groove 711; the first sliding shaft 721 is rotatably connected to one end of a second connecting rod 72, and the end of the second connecting rod 72 away from the first sliding shaft 721 is rotatably connected to the active fabric feeding frame 5; the end of the active fabric feeding frame 5 is provided with an active fabric feeding tooth 51.

[0057] During the rotation of the feeding shaft 34, it can drive the first connecting rod 71 to rotate. The first connecting rod 71 drives the second connecting rod 72 to rotate through the first sliding shaft 721, and then drives the active fabric feeding frame 5 to move through the second connecting rod 72, so as to realize the function of moving the fabric during the sewing process.

[0058] In one embodiment, the active feeder 5 and the differential feeder 6 are arranged in parallel, and both the active feeder 5 and the differential feeder 6 are provided with grooves 52. The main shaft 4 is provided with a tooth lifting slider 41 located in the groove 52, and the tooth lifting slider 41 is eccentrically connected to the main shaft 4.

[0059] During the operation of the sewing machine, the main shaft 4 rotates, which drives the lifting slider 41 to rotate, thereby driving the differential feed frame 6 and the active feed frame 5 to swing, thus controlling the movement of the differential feed dog 61 and the active feed dog 51.

[0060] An eccentric pin 8 is provided on the machine housing, and a sliding column 81 is provided at the end of the eccentric pin 8. The sliding column 81 is slidably disposed in the opening groove 53 of the active feed frame 5 and the differential feed frame 6.

[0061] The eccentric pin 8 is fixedly mounted on the machine housing. The sliding column 81 can rotate around the end of the eccentric pin 8. The sliding column 81 has a square structure and can cooperate with the opening slot 53 to limit and guide the active fabric feeding frame 5 and the differential fabric feeding frame 6.

[0062] The working principle of this application is as follows: the above structure uses the needle pitch motor shaft 13 as the driving crank, the feed shaft 12 as the driven rocker, and the needle pitch connecting rod 14 as the transmission connecting rod to form a crank-rocker mechanism. Under the action of the needle pitch adjusting motor 11, the feed shaft 12 can be driven to rotate, thereby controlling the movement position of the slide groove 161 on the feed crank 15, and thus controlling the sliding stroke of the slider 31, thereby achieving the function of adjusting the needle pitch. In addition, in the above differential adjustment structure 2, a crank-rocker mechanism is formed with the differential motor shaft 23 as the driving crank, the differential shaft 22 as the driven rocker, and the differential connecting rod 24 as the transmission connecting rod. Under the action of the differential adjusting motor 21, the differential shaft 22 can be driven to rotate, thereby controlling the rotation angle of the differential crank 25, and thus controlling the rotation amplitude of the differential connecting piece 26, thereby realizing differential adjustment.

[0063] In addition, encoders are installed on both the stitch length adjustment motor 11 and the differential adjustment motor 21, which can read the rotation angle of the stitch length motor shaft 13 and the differential motor shaft 23 in real time. This enables real-time judgment of the position of the overall stitch length differential and displays it on the control panel for intelligent adjustment of stitch length and differential size. This allows customers to quickly select the appropriate stitch length differential size to match the fabric when adjusting different fabrics.

[0064] Example 2: Refer to Figures 1 to 5 As shown, a differential adjustment structure for needle pitch includes:

[0065] The stitch pitch adjustment structure 1 includes a stitch pitch adjustment motor 11, a feed shaft 12, a stitch pitch motor shaft 13, and a stitch pitch connecting rod 14. The output end of the stitch pitch adjustment motor 11 is provided with the stitch pitch motor shaft 13. One end of the feed crank 15 is connected to the feed shaft 12, and the other end is rotatably connected to the control crank 16. The control crank 16 is provided with a slide groove 161, and a slider 31 is provided in the slide groove 161. The slider 31 is connected to the feed connecting rod assembly 3.

[0066] The differential adjustment structure 2 includes a differential adjustment motor 21, a differential shaft 22, a differential motor shaft 23, and a differential connecting rod 24. The output end of the differential adjustment motor 21 is provided with the differential motor shaft 23. One end of the differential crank 25 is fixedly connected to the differential shaft 22, and the other end is connected to the differential connecting piece 26.

[0067] In this application, the above structure uses the needle pitch motor shaft 13 as the driving crank, the feed shaft 12 as the driven rocker, and the needle pitch connecting rod 14 as the transmission connecting rod to form a crank-rocker mechanism. Under the action of the needle pitch adjusting motor 11, the feed shaft 12 can be driven to rotate, thereby controlling the movement position of the slide groove 161 on the feed crank 15, and thus controlling the sliding stroke of the slider 31, thereby achieving the function of adjusting the needle pitch. In addition, in the above differential adjustment structure 2, a crank-rocker mechanism is formed with the differential motor shaft 23 as the driving crank, the differential shaft 22 as the driven rocker, and the differential connecting rod 24 as the transmission connecting rod. Under the action of the differential adjusting motor 21, the differential shaft 22 can be driven to rotate, thereby controlling the rotation angle of the differential crank 25, and thus controlling the rotation amplitude of the differential connecting piece 26, thereby realizing differential adjustment.

[0068] In one embodiment, a needle pitch eccentric shaft section 131 is provided on the needle pitch motor shaft 13, and a feed eccentric shaft section 121 is provided on the feed shaft 12. The two ends of the needle pitch connecting rod 14 are respectively sleeved with the needle pitch eccentric shaft section 131 and the feed eccentric shaft section 121; one end of the feed crank 15 is sleeved on the feed shaft 12.

[0069] By setting a needle pitch eccentric section 131 on the needle pitch motor shaft 13 and a feeding eccentric section 121 on the feeding shaft 12, a stable rotation structure can be formed, making the overall structure more accurately controlled by the needle pitch adjustment motor 11.

[0070] In one embodiment, the differential motor shaft 23 is provided with an output eccentric shaft section 231, and the differential shaft 22 is provided with a differential eccentric shaft section 221; the two ends of the differential connecting rod 24 are respectively sleeved with the output eccentric shaft section 231 and the differential eccentric shaft section 221.

[0071] By setting an output eccentric shaft section 231 on the differential motor shaft 23 and a differential eccentric shaft section 221 on the differential shaft 22, the overall structure can be controlled more precisely by the differential adjustment motor 21.

[0072] In one embodiment, the assembly further includes a main shaft 4, an active feed frame 5, and a differential feed frame 6. The active feed frame 5 is provided with an active feed tooth 51 at its end, and the differential feed frame 6 is provided with a differential feed tooth 61 at its end. The feeding linkage assembly 3 includes a feeding linkage 32, a feeding crank 33, and a feeding shaft 34. One end of the feeding linkage 32 is rotatably connected to the main shaft 4, and the other end of the feeding linkage 32 is rotatably connected to the feeding crank 33 and has a slider 31 fixedly mounted thereon. The end of the feeding crank 33 away from the feeding linkage 32 is fixedly connected to the feeding shaft 34.

[0073] A main shaft journal is provided on the main shaft 4. One end of the feeding connecting rod 32 is rotatably mounted on the main shaft journal. Driven by the main shaft 4, the feeding connecting rod 32 reciprocates. When the feeding connecting rod 32 moves, it drives the feeding crank 33 to swing, which in turn drives the feeding shaft 34 to rotate. The feeding shaft 34 then drives the active fabric feeding frame 5 to move. Therefore, under the action of the stitch length adjustment motor 11, the feeding shaft 12 can be driven to rotate, thereby controlling the moving position of the slide groove 161 on the feeding crank 15, and thus controlling the sliding stroke of the slider 31. This controls the swing amplitude of the feeding shaft 34, thereby controlling the moving distance of the active fabric feeding frame 5, and thus controlling the distance of the active fabric feeding teeth 51, thereby achieving the function of adjusting the stitch length.

[0074] In one embodiment, an open long groove 162 is provided at the end of the control crank 16 away from the slide groove 161, and the feed shaft 34 is slidably disposed within the open long groove 162. With the above structure, the feed shaft 34 can be controlled to slide along the open long groove 162, so that the feed shaft 34 can slide at a specific angle, making the movement of the feed shaft 34 more stable and improving the stability of the control needle pitch.

[0075] In one embodiment, the feeding shaft 34 drives the active fabric feeding frame 5 to move via a linkage transmission mechanism 7. The linkage transmission mechanism 7 includes a first connecting rod 71 fixedly mounted on the feeding shaft 34, a first sliding groove 711 provided on the first connecting rod 71, and a first sliding shaft 721 provided in the first sliding groove 711; the first sliding shaft 721 is rotatably connected to one end of a second connecting rod 72, and the end of the second connecting rod 72 away from the first sliding shaft 721 is rotatably connected to the active fabric feeding frame 5; the end of the active fabric feeding frame 5 is provided with an active fabric feeding tooth 51.

[0076] During the rotation of the feeding shaft 34, it can drive the first connecting rod 71 to rotate. The first connecting rod 71 drives the second connecting rod 72 to rotate through the first sliding shaft 721, and then drives the active fabric feeding frame 5 to move through the second connecting rod 72, so as to realize the function of moving the fabric during the sewing process.

[0077] In one embodiment, the active feeder 5 and the differential feeder 6 are arranged in parallel, and both the active feeder 5 and the differential feeder 6 are provided with grooves 52. The main shaft 4 is provided with a tooth lifting slider 41 located in the groove 52, and the tooth lifting slider 41 is eccentrically connected to the main shaft 4.

[0078] During the operation of the sewing machine, the main shaft 4 rotates, which drives the lifting slider 41 to rotate, thereby driving the differential feed frame 6 and the active feed frame 5 to swing, thus controlling the movement of the differential feed dog 61 and the active feed dog 51.

[0079] An eccentric pin 8 is provided on the machine housing, and a sliding column 81 is provided at the end of the eccentric pin 8. The sliding column 81 is slidably disposed in the opening groove 53 of the active feed frame 5 and the differential feed frame 6.

[0080] The eccentric pin 8 is fixedly mounted on the machine housing. The sliding column 81 can rotate around the end of the eccentric pin 8. The sliding column 81 has a square structure and can cooperate with the opening slot 53 to limit and guide the active fabric feeding frame 5 and the differential fabric feeding frame 6.

[0081] This embodiment is similar in structure to that in Embodiment 1, except that a differential dividing rod 331 is fixedly provided on the feeding crank 33; a differential slide groove 62 is provided on the differential feeding frame 6, and a differential slider 63 is provided in the differential slide groove 62; a transition block 64 is rotatably connected to the end of the differential connecting piece 26 away from the differential crank 25, and a transition groove 641 is provided through the transition block 64, and the differential dividing rod 331 is slidably provided in the transition groove 641; the side of the transition block 64 away from the differential connecting piece 26 is rotatably connected to the differential slider 63.

[0082] The transition block 64 is located on both sides of the transition groove 641, with a first transition shaft and a second transition shaft 642 respectively. The first transition shaft is rotatably connected to the differential slider 63, and the second transition shaft is rotatably connected to the differential connecting piece 26. Through the structure of the transition block 64, the rotation of the differential connecting piece 26 can drive the differential fabric feeding frame 6 and control the position of the feeding shaft 34, thereby realizing the function of differential control.

[0083] Under the action of the differential adjustment motor 21, the differential shaft 22 can be driven to rotate, thereby controlling the rotation angle of the differential crank 25, and thus controlling the rotation amplitude of the differential connecting piece 26, so that the slider located at the end of the differential connecting piece 26 moves in the horizontal direction, thereby driving the differential fabric feeding frame 6 to move, and thus realizing the function of differential control.

[0084] The working principle of this application is as follows: the above structure uses the needle pitch motor shaft 13 as the driving crank, the feed shaft 12 as the driven rocker, and the needle pitch connecting rod 14 as the transmission connecting rod to form a crank-rocker mechanism. Under the action of the needle pitch adjusting motor 11, the feed shaft 12 can be driven to rotate, thereby controlling the movement position of the slide groove 161 on the feed crank 15, and thus controlling the sliding stroke of the slider 31, thereby achieving the function of adjusting the needle pitch. In addition, in the above differential adjustment structure 2, a crank-rocker mechanism is formed with the differential motor shaft 23 as the driving crank, the differential shaft 22 as the driven rocker, and the differential connecting rod 24 as the transmission connecting rod. Under the action of the differential adjusting motor 21, the differential shaft 22 can be driven to rotate, thereby controlling the rotation angle of the differential crank 25, and thus controlling the rotation amplitude of the differential connecting piece 26, thereby realizing differential adjustment.

[0085] In addition, encoders are installed on both the stitch length adjustment motor 11 and the differential adjustment motor 21, which can read the rotation angle of the stitch length motor shaft 13 and the differential motor shaft 23 in real time. This enables real-time judgment of the position of the overall stitch length differential and displays it on the control panel for intelligent adjustment of stitch length and differential size. This allows customers to quickly select the appropriate stitch length differential size to match the fabric when adjusting different fabrics.

[0086] The embodiments described above are merely preferred solutions of this utility model and are not intended to limit this utility model in any way. Other variations and modifications are possible without departing from the technical solutions described in the claims.

Claims

1. A differential adjustment structure for needle pitch, characterized in that, include: The stitch pitch adjustment structure includes a feed shaft, a stitch pitch motor shaft, and a stitch pitch connecting rod; one end of the feed crank is connected to the feed shaft, and the other end is rotatably connected to a control crank. The control crank is provided with a groove, and a slider is provided in the groove. The slider is connected to the feed connecting rod assembly. The differential adjustment structure includes a differential shaft, a differential motor shaft, and a differential connecting rod; one end of the differential crank is fixedly connected to the differential shaft, and the other end is connected to the differential connecting plate.

2. The needle pitch differential adjustment structure according to claim 1, characterized in that, The needle pitch motor shaft is provided with a needle pitch eccentric shaft section, the feed shaft is provided with a feed feed eccentric shaft section, and the two ends of the needle pitch connecting rod are respectively sleeved with the needle pitch eccentric shaft section and the feed feed eccentric shaft section; one end of the feed feed crank is sleeved on the feed feed shaft.

3. The needle pitch differential adjustment structure according to claim 1, characterized in that, The differential motor shaft is provided with an output eccentric shaft section, and the differential shaft is provided with a differential eccentric shaft section; the two ends of the differential connecting rod are respectively sleeved with the output eccentric shaft section and the differential eccentric shaft section.

4. The differential adjustment structure for needle spacing according to any one of claims 1 to 3, characterized in that, It also includes a main shaft, an active feeder, and a differential feeder; the feeding linkage assembly includes a feeding linkage, a feeding crank, and a feeding shaft; one end of the feeding linkage is rotatably connected to the main shaft, and the other end of the feeding linkage is rotatably connected to the feeding crank and is fixedly equipped with a slider; the end of the feeding crank away from the feeding linkage is fixedly connected to the feeding shaft.

5. The needle pitch differential adjustment structure according to claim 4, characterized in that, An open long groove is provided at the end of the control crank away from the slide, and the feed shaft is slidably disposed in the open long groove.

6. The needle pitch differential adjustment structure according to claim 4, characterized in that, A first connecting rod is fixedly installed on the feeding shaft. A first sliding groove is provided on the first connecting rod, and a first sliding shaft is provided in the first sliding groove. The first sliding shaft is rotatably connected to one end of the second connecting rod, and the end of the second connecting rod away from the first sliding shaft is rotatably connected to the active feeding frame. The end of the active feeding frame is provided with an active feeding tooth.

7. The needle pitch differential adjustment structure according to claim 4, characterized in that, A differential dividing rod is fixedly installed on the feeding crank; a differential slide groove is provided on the differential feeding frame, and a differential slider is installed in the differential slide groove; a transition block is rotatably connected to the end of the differential connecting piece away from the differential crank, and a transition groove is provided through the transition block, and the differential dividing rod is slidably installed in the transition groove; the side of the transition block away from the differential connecting piece is rotatably connected to the differential slider.

8. The needle pitch differential adjustment structure according to claim 7, characterized in that, The transition block is located on both sides of the transition groove, with a first transition shaft and a second transition shaft respectively; the first transition shaft is rotatably connected to the differential slider, and the second transition shaft is rotatably connected to the differential connecting piece.

9. The needle pitch differential adjustment structure according to claim 4, characterized in that, The active feed frame and the differential feed frame are arranged in parallel, and both the active feed frame and the differential feed frame are provided with grooves. The main shaft is provided with a tooth lifting slider located in the groove, and the tooth lifting slider is eccentrically connected to the main shaft.

10. The needle pitch differential adjustment structure according to claim 4, characterized in that, The active feed frame and the differential feed frame are arranged in parallel, and both the active feed frame and the differential feed frame have open slots at their ends; an eccentric pin is provided on the machine housing, and a sliding column is provided at the end of the eccentric pin, which is slidably arranged in the open slots of the active feed frame and the differential feed frame.

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