Adjustable upper differential lockstitch sewing machine

Abstract

The utility model relates to the technical field of lockstitch sewing machines, in particular to an adjustable upper differential lockstitch sewing machine. Comprising a rack, an upper cloth feeding mechanism is arranged in the rack, and the upper cloth feeding mechanism is driven by an upper shaft; the upper cloth feeding mechanism comprises a swing seat, a longitudinal moving assembly and a swing assembly. The swing assembly comprises a first cam, a second cam, a third cam and a fourth cam, the first cam connecting rod is connected with the first cam; one end of the first transmission connecting rod is connected with the first cam connecting rod, and the other end of the first transmission connecting rod sleeves the first transmission shaft; the first transmission part is arranged on the first transmission shaft in a sleeving manner; the swing rod is connected with the transmission part I, and the lower end of the swing rod is hinged to the swing seat; when the swing assembly drives the swing rod to rotate, the lower end of the swing rod can pull the swing base to move. The swing assembly and the longitudinal moving assembly are matched so that the swing base can execute the cloth feeding action. The rack is further provided with a first adjusting assembly, and the lifting height of the upper feed dog can be adjusted through the first adjusting assembly.

Description

Technical Field

[0001] The utility model relates to the technical field of lockstitch sewing machines, in particular to an adjustable upper differential lockstitch sewing machine. Background Art

[0002] A lockstitch sewing machine is a common sewing machine that is often used to sew single or multi-layered materials and can effectively sew multiple layers of material together. The upper differential lockstitch sewing machine can simultaneously feed multiple layers of material from both ends during sewing. This allows the upper layers of material to be moved synchronously when the material is heavy or has a smooth surface, ensuring the accuracy of subsequent sewing, improving product quality, and avoiding material waste.

[0003] However, the prior art still has the following deficiencies:

[0004] For example, in Chinese patent CN 202221329141.4, an upper differential adjustment mechanism and sewing machine are disclosed. In existing upper differential sewing machines, the upper feed mechanism is usually driven by an upper shaft to perform the feed action in order to ensure better coordination with the lower feed mechanism. However, this also results in the upper feed mechanism only being able to drive the upper feed dog to a fixed height, which has low flexibility and is difficult to adjust for different sewing materials. Utility Model Content

[0005] The purpose of the utility model is to provide an adjustable upper differential flat sewing machine to solve the problem that the current upper differential flat sewing machine cannot stably adjust the height of the upper feed dog when dealing with different sewing occasions, resulting in limited usage scenarios of the flat sewing machine.

[0006] The purpose of this utility model is achieved in this way:

[0007] An adjustable upper differential lockstitch sewing machine comprises: a frame, an upper cloth feeding mechanism is arranged in the frame, and the upper cloth feeding mechanism is driven by an upper shaft;

[0008] The upper cloth feeding mechanism comprises:

[0009] A swing seat, on which an upper feed dog is provided;

[0010] A longitudinal moving assembly connected to the upper shaft and used to drive the swing seat to move up and down;

[0011] A swing assembly, used for driving the swing seat to swing;

[0012] Wherein, the swing assembly includes:

[0013] Cam 1, which is sleeved on the upper shaft;

[0014] a cam connecting rod 1, one end of which is connected to the cam 1;

[0015] a first transmission connecting rod, one end of which is connected to the power output end of the first cam connecting rod, and the other end of which is sleeved on the outside of the first transmission shaft, so that the first transmission connecting rod can drive the first transmission shaft to rotate;

[0016] a first transmission member, which is sleeved on the first transmission shaft;

[0017] A swing rod, connected to the transmission member 1, and the lower end of the swing rod is hinged on the swing seat;

[0018] When the swing assembly drives the swing rod to rotate, the lower end of the swing rod can pull the swing seat to move; the swing assembly and the longitudinal moving assembly cooperate to enable the swing seat to perform the cloth feeding action;

[0019] The frame is further provided with an adjustment component 1, which is connected to the swing component;

[0020] The adjusting component 1 can limit the swing path of the lower end of the swing rod, or change the position of the lower end of the swing rod, so as to achieve the purpose of adjusting the lifting height of the upper feed dog.

[0021] Preferably, the first adjustment component comprises:

[0022] A rotating seat, wherein a fixed shaft is passed through the middle thereof so that the rotating seat can be rotatably fixed on the frame;

[0023] a limiting connecting rod, the lower end of which is connected to the lower end of the rotating seat;

[0024] The power output end is connected to the upper end of the limit connecting rod;

[0025] An adjustment portion is provided at the upper end of the rotating seat. By adjusting the position of the adjustment portion, the rotation angle of the rotating seat can be limited, thereby limiting the movement path of the power output end, and then by changing the swing angle of the transmission member 1 and the swing rod, the purpose of adjusting the lifting height of the swing seat can be achieved.

[0026] Preferably, the adjustment component 1 further includes:

[0027] an adjusting screw connected to the adjusting portion;

[0028] An adjusting knob is arranged at the upper end of the adjusting screw and is used to control the rotation of the adjusting screw.

[0029] Preferably, the adjustment component 1 further includes:

[0030] A lifting seat having a second through slot formed thereon, wherein the second through slot can be sleeved on the outer side of the adjusting portion;

[0031] an adjusting screw connected to the lifting seat and used to drive the lifting seat to move;

[0032] The adjusting motor is used to drive the adjusting screw to rotate.

[0033] Preferably, the power output end is further connected to a second transmission connecting rod;

[0034] The cam link 1 is connected to the transmission link 1 through the transmission link 2.

[0035] Preferably, a through groove 1 is formed at the lower end of the transmission member 1;

[0036] A transmission arm is provided at one end of the swing rod, and an abutment portion is provided at the upper end of the transmission arm. The abutment portion is inserted into the through slot 1 and can move along the through slot 1.

[0037] Preferably, the longitudinal movement component includes:

[0038] A presser foot rod is connected to the upper shaft of the sewing machine, and a roller is connected to the lower end of the presser foot rod;

[0039] Cam 2, which is sleeved on the upper shaft;

[0040] a second cam connecting rod connected to the second cam;

[0041] a second transmission member connected to the second cam connecting rod, wherein the second transmission member is provided with a pushing portion;

[0042] A toggle member having a first toggle arm and a second toggle arm formed thereon;

[0043] The presser foot rod is provided with a toggle portion;

[0044] When the second cam link drives the second transmission member to rotate, the pushing portion can push the first toggle arm and drive the toggle member to rotate; and make the second toggle arm contact the toggle portion, thereby driving the presser foot rod to move by pushing the toggle portion.

[0045] Preferably, a rolling groove is formed on the swing seat, and the roller can move in the rolling groove;

[0046] An avoidance groove 1 is provided on the swing seat, and the avoidance groove 1 leads to the rolling groove, and the presser foot rod can pass through the avoidance groove 1; and the roller cannot pass through the avoidance groove 1, so that the longitudinal moving component can drive the swing seat to lift or lower.

[0047] Preferably, a connecting piece is sleeved on the presser foot rod, and a hinge groove is formed on one end of the connecting piece;

[0048] The swing arm is sleeved with a limiting sleeve, and the limiting sleeve is formed with a strip hole 1, and the connecting shaft can be placed in the strip hole 1, so that the swing arm can be movably hinged to one end of the connecting piece.

[0049] Preferably, a second transmission shaft is provided at the bottom end of the swing arm, and the swing arm is hinged to the swing seat via the second transmission shaft;

[0050] A restraining link is provided on the second transmission shaft, and the upper end of the restraining link is connected to the connecting shaft.

[0051] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0052] 1. The upper cloth feeding mechanism in this technical solution includes an adjustment mechanism that can adjust the rotation angle of the rotating seat, and then change the swing angle of the swing rod, so as to achieve the purpose of adjusting the lifting height of the cloth feeding dog.

[0053] 2. The upper cloth feeding mechanism is driven by the upper shaft, so that when the upper cloth feeding mechanism performs the cloth feeding action, it can match the original lower cloth feeding dog action to improve the accuracy of the execution action. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a structural diagram of the utility model;

[0055] Figure 2 This is a schematic diagram of the structure of the first embodiment of the present invention after the frame is removed;

[0056] Figure 3 This is a structural diagram of the swing assembly, swing rod and swing seat of the first embodiment of the present utility model;

[0057] Figure 4 It is a cross-sectional view of the utility model;

[0058] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0059] Figure 6 It is a structural diagram of the longitudinal moving assembly of the utility model;

[0060] Figure 7 for Figure 4 Enlarged view of point B in the middle;

[0061] Figure 8 This is a schematic structural diagram of the second embodiment of the present invention after the frame is removed.

[0062] Reference numerals:

[0063] 1. Frame; 11. Mounting slot; 12. Through hole 1; 13. Through hole 2;

[0064] 2. Longitudinal moving assembly; 21. Presser foot bar; 211. Toggle portion; 212. Roller; 22. Fixed sleeve; 221. Return spring 1; 222. Strip hole 2; 23. Cam 2; 24. Cam connecting rod 2; 25. Transmission member 2; 251. Pushing portion; 26. Toggle member; 261. First toggle arm; 262. Second toggle arm; 27. Sleeve; 28. Connecting seat; 281. Raised ring portion; 282. Connecting core; 29. ​​Positioning seat;

[0065] 3. Swing assembly; 31. Rotating seat; 311. Limiting link; 312. Transmission link 2; 32. Cam 1; 33. Cam link 1; 331. Power output end; 34. Transmission shaft 1; 35. Fixed shaft; 36. Transmission link 1; 37. Adjustment unit; 38. Transmission member 1; 39. Through slot 1;

[0066] 4. Swing seat; 41. Rolling groove; 411. Opening; 412. Avoidance groove 1; 42. Upper feed dog mounting portion;

[0067] 5. Swinging rod; 51. Connecting head; 52. Connecting rod; 53. Second transmission shaft; 54. Transmission arm; 55. Abutment portion; 56. Rotating shaft;

[0068] 6. Connecting piece; 61. Articulated slot; 62. Connecting shaft; 63. Constraint connecting rod;

[0069] 7. Limit sleeve;

[0070] 8. Adjustment assembly 1; 81. Adjustment knob; 82. Adjustment motor; 83. Lifting seat; 84. Through slot 2; 85. Adjustment screw;

[0071] 9. Adjustment component 2; 91. Adjustment rod; 92. Fixed seat; 93. Through hole 3; 94. Limit block; 95. Return spring 2; 96. Adjustment nut; 97. Connecting groove. DETAILED DESCRIPTION

[0072] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0073] [Example 1]

[0074] like Figure 1-Figure 3 An adjustable upper differential lockstitch sewing machine shown includes: a frame 1, an upper cloth feeding mechanism is provided in the frame 1, and the upper cloth feeding mechanism is driven by an upper shaft;

[0075] Upper cloth feeding mechanism includes:

[0076] A swing seat 4, on which an upper feed dog is provided;

[0077] The longitudinal moving assembly 2 is connected to the upper shaft and is used to drive the swing seat 4 to move up and down;

[0078] The swing assembly 3 is used to drive the swing seat 4 to swing.

[0079] The swing assembly 3 includes:

[0080] Cam 1 32, which is sleeved on the upper shaft, enables the upper shaft to drive the swing assembly 3 to move;

[0081] A cam connecting rod 33, one end of which is connected to the cam 32;

[0082] A transmission link 36 has one end connected to the power output end 331 of the cam link 33 and the other end sleeved on the outside of the transmission shaft 34, so that when the transmission link 36 is driven by the cam link 33 to swing, it can drive the transmission shaft 34 to rotate;

[0083] A transmission member 38 is sleeved on a transmission shaft 34;

[0084] The swing rod 5 is connected to the transmission member 38, and the lower end of the swing rod 5 is hinged on the swing seat 4. When the transmission shaft 34 rotates, the swing rod 5 can be driven to swing through the transmission member 38, and the swing seat 4 can be driven to swing.

[0085] When the cam link 33 drives the swing lever 5 to rotate, the lower end of the swing lever 5 can pull the swing seat 4 to move. Through the cooperation of the longitudinal movement component 2 and the swing component 3, the swing seat 4 can drive the upper feed dog to cooperate with the lower feed dog to perform the cloth feeding action, realizing the synchronous movement of multiple layers of sewing materials, thereby improving the accuracy of the sewing action and ensuring the quality of the product.

[0086] An adjusting component 8 is also provided on the frame 1, which is connected to the swing component 3. The adjusting component 8 is used to adjust the swing angle of the swing rod 5 of the swing component 3, and the lower end of the swing rod 5 is hinged on the swing seat 4.

[0087] By adjusting the component 18, the swing path of the lower end of the swing rod 5 can be limited, or the height of the position of the lower end of the swing rod 5 can be changed, so as to achieve the purpose of adjusting the lifting height of the upper feed dog.

[0088] When facing sewing materials of different thicknesses or materials, the upper feed dog can be adjusted through the adjustment component 8 so that the movement trajectory of the upper feed dog can better cope with sewing work of sewing materials of different thicknesses or materials. This can improve the flexibility of the upper differential lockstitch sewing machine and meet the production requirements of different products.

[0089] like Figure 2 and Figure 3 As shown, the regulating component 8 includes:

[0090] The rotating base 31 has a fixed shaft 35 passing through its center, so that the rotating base 31 can be fixed on the frame 1 and rotate around the fixed shaft 35 .

[0091] The lower end of the limiting connecting rod 311 is connected to the lower end of the rotating base 31 .

[0092] The power output end 331 is connected to the upper end of the limiting link 311 .

[0093] An adjusting portion 37 is provided at the upper end of the rotating seat 31. By changing the position of the adjusting portion 37, the rotating seat 31 can be tilted at different angles, thereby limiting the movement path of the power output end 331, and then by changing the swing angle of the transmission member 38 and the swing rod 5, the purpose of adjusting the lifting height of the swing seat 4 is achieved.

[0094] Because the power output end 331 is connected to the lower end of the rotating base 31 via the limiting link 311, the distance between the power output end 331 and the lower end of the rotating base 31 is constant. Therefore, when the position of the lower end of the rotating base 31 changes, the limiting link 311 can limit the swing path of the power output end 331, thereby changing the swing amplitude of the transmission link 1 36 and ultimately achieving the purpose of adjusting the lifting height of the swing base 4.

[0095] Furthermore, in this embodiment, the adjustment component 8 includes:

[0096] an adjusting screw 85 connected to the adjusting portion 37;

[0097] The adjusting knob 81 is provided at the upper end of the adjusting screw 85 and is used to control the rotation of the adjusting screw 85 .

[0098] The adjusting knob 81 is formed with a threaded portion, so that the adjusting knob 81 can be screwed onto the frame 1, and the threaded portion can be screwed onto the adjusting portion 37. When the adjusting knob 81 is rotated, the adjusting portion 37 can be driven to rise or fall, thereby changing the position of the upper end of the rotating base 31 and changing the tilt angle of the rotating base 31.

[0099] Specific as Figure 3 As shown, the power output end 331 is also connected to the second transmission connecting rod 312.

[0100] The cam link 1 33 is connected to the transmission link 1 36 through the transmission link 2 312 .

[0101] like Figure 1-Figure 3 As shown, the transmission connecting rod 1 36 drives the transmission member 1 38 to swing through the transmission shaft 1 34 , and a through slot 1 39 is formed at the lower end of the transmission member 1 38 .

[0102] The upper end of the swing rod 5 is connected to the transmission arm 54 through the second transmission shaft 53 . The upper end of the transmission arm 54 is provided with an abutment portion 55 , which is inserted into the first through slot 39 .

[0103] When transmission member 1 38 swings, the inner sidewall of through-slot 1 39 pushes abutment 55 to move, driving transmission arm 54 to rotate. Because the movement trajectory of abutment 55 is an arc centered on the axis of transmission shaft 2 53 , the provision of through-slot 1 39 on transmission member 1 38 allows abutment 55 to smoothly move along through-slot 1 39 when pushed, unaffecting its movement trajectory and ensuring a stable transmission effect.

[0104] Since both the transmission connecting rod 1 36 and the transmission member 1 38 swing around the transmission shaft 1 34 , the swing amplitudes of the transmission connecting rod 1 36 and the transmission member 1 38 are the same.

[0105] like Figure 2-Figure 4 As shown, a mounting groove 11 is formed on the frame 1 , a through hole 12 is formed on the side of the mounting groove 11 , and the through hole 12 passes through the frame 1 .

[0106] The swing arm 5 includes a connecting head 51 and a connecting rod portion 52 . The second transmission shaft 53 is passed through the connecting head 51 , and the connecting head 51 is disposed in the mounting groove 11 .

[0107] The lower end of the swing lever 5 is formed into a connecting rod portion 52 , and the lower end of the connecting rod portion 52 is hinged to the hinge groove 61 ;

[0108] The connecting head 51 is sleeved on the outside of the limiting sleeve 7, and the connecting rod portion 52 is movably inserted into the limiting sleeve 7. The connecting head 51 is connected to the transmission shaft 34.

[0109] A rotation shaft 56 is provided at the bottom end of the connecting rod portion 52 of the swing lever 5 , and the connecting rod portion 52 is hinged to the swing seat 4 via the rotation shaft 56 .

[0110] A restraining link 63 is further provided on the rotating shaft 56 , and the upper end of the restraining link 63 is connected to the connecting shaft 62 .

[0111] Since the limiting sleeve 7 is hinged in the hinge groove 61 of the connecting member 6 , the swing path of the limiting sleeve 7 can be constrained, thereby facilitating the determination of the motion trajectory of the swing seat 4 when performing the cloth feeding action.

[0112] By setting a constraint link 63, which is respectively connected to the connecting shaft 62 and the rotating shaft 56, the movement trajectory of one end of the swing seat 4 can be further constrained, so that a fixed distance is maintained between one end of the swing seat 4 and the connecting shaft 62, so as to limit the movement trajectory of the swing seat 4 and improve the accuracy when performing the cloth feeding action.

[0113] like Figures 1-6 As shown, the presser foot rod 21 is connected to the upper shaft of the sewing machine, and the lower end of the presser foot rod 21 is connected to a roller 212;

[0114] A rolling groove 41 is formed on the swing seat 4 , and an opening 411 is formed at one end of the rolling groove 41 . The roller 212 can be placed into the rolling groove 41 through the opening 411 and can move in the rolling groove 41 .

[0115] The swing seat 4 is provided with an escape groove 412 that leads to the rolling groove 41. The presser foot rod 21 can pass through the escape groove 412, while the roller 212 cannot pass through the escape groove 412. This allows the longitudinal moving assembly 2 to drive the swing seat 4 upward. This, in conjunction with the swing assembly 3, drives the swing seat 4 to swing via the swing rod 5, enabling the upper feed dog to perform the cloth feeding action.

[0116] An upper feed dog mounting portion 42 is formed at the lower end of the swing seat 4, and the upper feed dog mounting portion 42 is used to set the upper feed dog.

[0117] like Figure 1-Figure 7 As shown, the longitudinal moving component 2 also includes:

[0118] Cam 23, which is sleeved on the upper shaft;

[0119] Cam connecting rod 24 connected to cam 23;

[0120] The second transmission member 25 is connected to the second cam link 24 and is provided with a pushing portion 251;

[0121] A toggle member 26 having a first toggle arm 261 and a second toggle arm 262 formed thereon;

[0122] The presser foot rod 21 is provided with a toggling portion 211 .

[0123] Specific as Figure 3 and Figure 7 As shown, when the cam link 24 drives the transmission member 25 to rotate, the pushing part 251 can push the first toggle arm 261 and drive the toggle member 26 to rotate; and make the second toggle arm 262 contact with the toggle part 211, and then the second toggle arm 262 can push the toggle part 211 to rise, thereby driving the presser foot rod 21 to lift.

[0124] When the cam link 24 rotates a certain angle, the pushing portion 251 separates from the first toggle arm 261. At this time, the toggle portion 211 still abuts against the upper end of the second toggle arm 262. When the pushing portion 251 no longer applies force to the first toggle arm 261, the second toggle arm 262 cannot support the weight of the presser foot bar 21, so that the presser foot bar 21 can be lowered and the presser foot can be pressed against the sewing material.

[0125] Furthermore, a fixing sleeve 22 is sleeved on the outer side of the presser foot rod 21 , and the upper end of the fixing sleeve 22 is inserted into the positioning seat 29 , and the position of the upper end of the fixing sleeve 22 is determined by the positioning seat 29 .

[0126] The frame 1 is further provided with a second through hole 13 , and the middle portion of the fixing sleeve 22 is passed through the second through hole 13 to fix the position of the presser foot rod 21 and to enable the presser foot rod 21 to be lifted or lowered only in the vertical direction.

[0127] A return spring 221 is disposed within the fixed sleeve 22. The upper end of the return spring 221 abuts against the inner side of the fixed sleeve 22, while the lower end of the return spring 221 abuts against the upper end surface of the presser foot rod 21. When the push portion 251 separates from the first toggle arm 261, the second toggle arm 262 is unable to support the presser foot rod 21, and the return spring 221 can further apply force to the presser foot rod 21, allowing the presser foot rod 21 to quickly reset. Furthermore, since the return spring 221 is disposed within the fixed sleeve 22, and the fixed sleeve 22 is sleeved onto the outside of the presser foot rod 21, the fixed sleeve 22 can further secure the position of the return spring 221, ensuring that the return spring 221 can stably abut against the upper end of the presser foot rod 21.

[0128] The fixing sleeve 22 is further provided with a second strip-shaped hole 222 for the shifting portion 211 to pass through.

[0129] As a preferred embodiment, the toggle portion 211 is a fixing pin. When the presser foot rod 21 is inserted into the fixing sleeve 22 , the toggle portion 211 can pass through the second strip hole 222 and be inserted into the upper end of the presser foot rod 21 .

[0130] At the same time, the second strip-shaped hole 222 can also limit the travel of the toggle portion 211 , thereby limiting the distance that the presser foot rod 21 moves the presser foot to rise.

[0131] The fixing sleeve 22 further includes a sleeve 27 and a connecting seat 28 . The sleeve 27 is sleeved on the outer side of the presser foot rod 21 .

[0132] The lower end of the connecting seat 28 is screwed onto the upper end of the sleeve 27, and a protruding ring portion 281 is formed on the connecting seat 28, which abuts against the sleeve 27. A connecting core 282 is also screwed into the connecting seat 28, and the connecting core 282 partially penetrates into the sleeve 27, and the upper end of the return spring 221 is sleeved on the lower end of the connecting core 282.

[0133] The upper end of the connecting seat 28 is connected to the adjusting component 2 9, and the adjusting component 2 9 includes:

[0134] The lower end of the adjusting rod 91 presses against the upper end of the connecting seat 28;

[0135] The fixing base 92 is screwed onto the frame 1 , and a through hole 3 93 is formed on the fixing base 92 . The adjusting rod 91 is passed through the through hole 3 93 , and an adjusting nut 96 is sleeved on the outside of the fixing base 92 . The adjusting nut 96 can easily drive the fixing base 92 to rotate, thereby changing the position of the fixing base 92 on the frame 1 .

[0136] The upper end of the adjusting rod 91 is connected to a limiting block 94 , and the limiting block 94 cannot pass through the third through hole 93 .

[0137] By rotating the fixing seat 92 , the length of the upper end of the fixing seat 92 extending out of the frame 1 can be adjusted, and by limiting the position of the limit block 94 , the position of the lower end of the adjusting rod 91 can be changed.

[0138] The adjusting rod 91 is formed with a connecting groove 97, so that the upper end of the connecting core 282 can be placed in the connecting groove 97, and the connecting core 282 is connected to the adjusting rod 91. When the position of the adjusting rod 91 moves, the position of the fixing sleeve 22 can be driven to move through the connecting core 282.

[0139] Since the toggle portion 211 is inserted into the second strip-shaped hole 222 , when the position of the fixing sleeve 22 changes, the height of the presser foot rod 21 will also change, thereby achieving the purpose of adjusting the height of the presser foot.

[0140] Furthermore, the outer sleeve of the adjusting rod 91 is provided with a second return spring 95, and the lower end of the second return spring 95 abuts against the convex ring portion 281. This can further limit the position of the fixing sleeve 22 and avoid unnecessary shaking of the fixing sleeve.

[0141] [Example 2]

[0142] This embodiment is basically the same as the embodiment, and the differences are as follows:

[0143] like Figure 8 As shown, the regulating component 8 includes:

[0144] The lifting seat 83 has a second through slot 84 formed thereon, and the second through slot 84 can be sleeved on the outer side of the adjustment portion 37;

[0145] The adjusting screw 85 is connected to the lifting base 83 and is used to drive the lifting base 83 to move.

[0146] The adjusting motor 82 is used to drive the adjusting screw 85 to rotate.

[0147] When the adjusting motor 82 drives the adjusting screw 85 to rotate, it can drive the lifting seat 83 to rise or fall, and the lifting seat 83 pushes the adjusting part 37 to rise or fall, thereby changing the position of the upper end of the rotating seat 31 and achieving the purpose of adjusting the height of the lower end of the swing rod 5.

[0148] It should be noted that the structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification for the understanding and reading of those familiar with this technology, and are not used to limit the conditions for the implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose of the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be considered as the scope of the implementation of the present invention without substantially changing the technical content.

[0149] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element through an intervening element.

[0150] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

Claims

1. An adjustable upper differential lockstitch sewing machine, characterized in that: include: A frame (1), wherein an upper cloth feeding mechanism is provided in the frame (1), and the upper cloth feeding mechanism is driven by an upper shaft; The upper cloth feeding mechanism comprises: A swing seat (4) on which an upper feed dog is provided; A longitudinal moving assembly (2), connected to the upper shaft, for driving the swing seat (4) to move up and down; A swing assembly (3) is used to drive the swing seat (4) to swing; Wherein, the swing assembly (3) comprises: A cam (32) sleeved on the upper shaft; A cam connecting rod (33), one end of which is connected to the cam (32); A transmission connecting rod (36) having one end connected to the power output end (331) of the cam connecting rod (33) and the other end sleeved on the outside of the transmission shaft (34) so ​​that the transmission connecting rod (36) can drive the transmission shaft (34) to rotate; A transmission member (38) sleeved on the transmission shaft (34); A swing rod (5) connected to the transmission member 1 (38), and the lower end of the swing rod (5) is hinged on the swing seat (4); When the swing assembly (3) drives the swing rod (5) to rotate, the lower end of the swing rod (5) can pull the swing seat (4) to move; the swing assembly (3) and the longitudinal moving assembly (2) cooperate to enable the swing seat (4) to perform a cloth feeding action; The frame (1) is further provided with an adjustment component (8), and the adjustment component (8) is connected to the swing component (3); The adjusting component 1 (8) can limit the swing path of the lower end of the swing rod (5), or change the position of the lower end of the swing rod (5), thereby achieving the purpose of adjusting the lifting height of the upper feed dog.

2. The adjustable upper differential lockstitch sewing machine according to claim 1, characterized in that: The regulating component one (8) comprises: A rotating seat (31) is provided with a fixed shaft (35) passing through the middle thereof, so that the rotating seat (31) can be rotatably fixed on the frame (1); a limiting connecting rod (311), the lower end of which is connected to the lower end of the rotating seat (31); The power output end (331) is connected to the upper end of the limiting connecting rod (311); An adjusting portion (37) is provided at the upper end of the rotating seat (31). By changing the position of the adjusting portion (37), the rotating seat (31) can be tilted at different angles, thereby limiting the movement path of the power output end (331). Furthermore, by changing the swing angle of the transmission member 1 (38) and the swing rod (5), the purpose of adjusting the lifting height of the swing seat (4) is achieved.

3. The adjustable upper differential lockstitch sewing machine according to claim 2, characterized in that: The regulating component (8) further comprises: an adjusting screw (85) connected to the adjusting portion (37); An adjusting knob (81) is provided at the upper end of the adjusting screw (85) and is used to control the rotation of the adjusting screw (85).

4. The adjustable upper differential lockstitch sewing machine according to claim 2, characterized in that: The regulating component (8) further comprises: A lifting seat (83) is formed with a second through slot (84), and the second through slot (84) can be sleeved on the outer side of the adjusting portion (37); an adjusting screw (85), which is connected to the lifting seat (83) and is used to drive the lifting seat (83) to move; The adjusting motor (82) is used to drive the adjusting screw (85) to rotate.

5. The adjustable upper differential lockstitch sewing machine according to claim 2, characterized in that: The power output end (331) is also connected to a second transmission connecting rod (312); The cam link 1 (33) is connected to the transmission link 1 (36) through the transmission link 2 (312).

6. An adjustable upper differential lockstitch sewing machine according to claim 3, 4 or 5, characterized in that: The lower end of the transmission member 1 (38) is formed with a through groove 1 (39); A transmission arm (54) is provided at one end of the swing lever (5), and an abutment portion (55) is provided at the upper end of the transmission arm (54). The abutment portion (55) is inserted into the through slot 1 (39), and the abutment portion (55) is capable of moving along the through slot 1 (39).

7. The adjustable upper differential lockstitch sewing machine according to claim 6, characterized in that: The longitudinal moving component (2) comprises: A presser foot rod (21) is connected to the upper shaft of the sewing machine, and the lower end of the presser foot rod (21) is connected to a roller (212); Cam 2 (23), which is sleeved on the upper shaft; Cam connecting rod 2 (24), connected to cam 2 (23); A second transmission member (25) is connected to the second cam connecting rod (24), and a pushing portion (251) is provided on the second transmission member (25); A toggle member (26) having a first toggle arm (261) and a second toggle arm (262) formed thereon; The presser foot rod (21) is provided with a toggle portion (211); When the second cam connecting rod (24) drives the second transmission member (25) to rotate, the pushing portion (251) can push the first toggle arm (261) and drive the toggle member (26) to rotate; and make the second toggle arm (262) contact the toggle portion (211), and drive the presser foot rod (21) to move by pushing the toggle portion (211).

8. The adjustable upper differential lockstitch sewing machine according to claim 7, characterized in that: A rolling groove (41) is formed on the swing seat (4), and the roller (212) is capable of moving in the rolling groove (41); The swing seat (4) is provided with a first avoidance groove (412), the first avoidance groove (412) leading to the rolling groove (41), the presser foot rod (21) can pass through the first avoidance groove (412); and the roller (212) cannot pass through the first avoidance groove (412), so that the longitudinal moving component (2) can drive the swing seat (4) to rise or fall.

9. The adjustable upper differential lockstitch sewing machine according to claim 7, characterized in that: The presser foot rod (21) is sleeved with a connecting piece (6), and one end of the connecting piece (6) is formed with a hinge groove (61); A limiting sleeve (7) is sleeved on the swing lever (5), and a strip-shaped hole (71) is formed on the limiting sleeve (7). The connecting shaft (62) can be placed in the strip-shaped hole (71), so that the swing lever (5) can be movably hinged to one end of the connecting member (6).

10. The adjustable upper differential lockstitch sewing machine according to claim 8 or 9, characterized in that: A second transmission shaft (53) is provided at the bottom end of the swing lever (5), and the swing lever (5) is hinged to the swing seat (4) via the second transmission shaft (53); A restraining link (63) is provided on the second transmission shaft (53), and the upper end of the restraining link (63) is connected to the connecting shaft (62).

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