Presser foot lifting and tooth adjusting device of sewing machine, its control method and sewing machine

Abstract

The present invention relates to a presser foot lifting and tooth feeding device for a sewing machine, its control method, and a sewing machine. The sewing machine includes a presser foot mechanism, a thread cutting mechanism, and a lower tooth feeding mechanism. The presser foot lifting and tooth feeding device for the sewing machine includes a cam mechanism and a driving mechanism. The cam mechanism includes a presser foot lifting cam and a lower tooth feeding cam. The presser foot lifting cam has a presser foot lifting profile surface, and the presser foot lifting profile surface cooperates with the presser foot mechanism; the lower tooth feeding cam has a lower tooth feeding profile surface, and the lower tooth feeding profile surface cooperates with the lower tooth feeding mechanism. By providing the driving mechanism, the present invention can drive the presser foot mechanism and the lower tooth feeding mechanism to act simultaneously. By designing the contour curves of the presser foot lifting profile surface and the lower tooth feeding profile surface, before starting sewing, the presser foot mechanism and the lower tooth feeding mechanism can act separately, so as to increase the material placing space and facilitate placing the fabric; and it can make the presser foot mechanism act and the lower tooth feeding mechanism not act, which can ensure that the stitch is not affected and improve the sewing efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of sewing machines, in particular to a presser foot lifting and tooth adjusting device for a sewing machine, its control method, and a sewing machine. Background Art

[0002] In the existing sewing machine structure, there are often multiple motion mechanisms for implementing different functions, such as a feeding mechanism, a presser foot mechanism, a thread cutting mechanism, a lower tooth feeding mechanism, etc. These mechanisms cooperate with each other to complete the complete sewing function of the sewing machine. The main function of the feeding mechanism is to continuously lift and pull the fabric on the needle plate through the reciprocating elliptical motion of the feed dog holder, so as to transport the fabric; the main function of the presser foot mechanism is to cooperate with the feeding mechanism to complete the dragging of the fabric during the fabric transportation process, press the fabric during the sewing process, and lift the presser foot before or after the sewing is completed for adding materials; while the main function of the thread cutting mechanism is to cut the sewing thread after the sewing is completed; the main function of the lower tooth feeding mechanism is to drive the feed dog and the differential dog of the feeding mechanism to descend below the upper surface of the needle plate or to be flush with the upper surface of the needle plate.

[0003] In the prior art, before starting sewing, the fabric needs to be placed under the presser foot mechanism, but the feed dog and the differential dog both protrude from the needle plate, resulting in a reduced distance between the presser foot mechanism and the feed dog and the differential dog, and thus a smaller feeding space, making it difficult to place the fabric; therefore, a technology has been developed in this field to simultaneously lift the presser foot and link to lower the teeth below the needle plate. However, during the sewing process of the sewing machine, sometimes it is necessary to lift the presser foot mechanism. At this time, the lifting and lowering of the presser foot mechanism also drive the movement of the feed dog and the differential dog, which will cause the fabric to move, and thus have a certain impact on the stitch of the sewn fabric, resulting in a reduction in sewing quality. Summary of the Invention

[0004] Based on this, it is necessary to provide a presser foot lifting and tooth adjusting device for a sewing machine, its control method, and a sewing machine that can ensure an increased feeding space for placing the fabric before starting sewing, and can ensure that the stitch is not affected during the sewing process and can improve the sewing efficiency.

[0005] A presser foot lifting and tooth adjusting device for a sewing machine, the sewing machine includes a machine shell, a presser foot mechanism and a lower tooth feeding mechanism arranged on the machine shell, and the presser foot lifting and tooth adjusting device for the sewing machine includes:

[0006] A cam mechanism, the cam mechanism includes a presser foot lifting cam and a lower tooth feeding cam arranged coaxially, the presser foot lifting cam has a presser foot lifting profile surface for forming a follower fit with the presser foot mechanism to drive the presser foot mechanism to act;

[0007] The lower tooth supply cam has a lower tooth supply profile surface for forming a follower fit with the lower tooth supply mechanism to drive the lower tooth supply mechanism to act; the lower tooth supply profile surface includes a non-lowering tooth section and a lowering tooth section; the presser foot profile surface at least includes a presser foot section, and the presser foot section includes a first presser foot section and a second presser foot section corresponding to the non-lowering tooth section and the lowering tooth section respectively;

[0008] A driving mechanism for driving the cam mechanism to rotate;

[0009] Wherein, in the first working mode, when the presser foot mechanism forms a follower fit with the second presser foot section, the lower tooth supply mechanism forms a follower fit with the lowering tooth section; in the second working mode, when the presser foot mechanism forms a follower fit with the first presser foot section, the lower tooth supply mechanism forms a follower fit with the non-lowering tooth section.

[0010] In one embodiment, the presser foot profile surface is matched with the presser foot mechanism through a presser foot driving assembly;

[0011] Wherein, the presser foot driving assembly includes a presser foot lever and a presser foot roller. The presser foot lever is in transmission connection with the presser foot mechanism. One end of the presser foot lever is hinged, and the other end of the presser foot lever is connected to the presser foot roller. The presser foot roller is matched with the presser foot profile surface. When the presser foot cam rotates, the presser foot profile surface drives the presser foot lever to rotate through the presser foot roller, so that the presser foot lever drives the presser foot mechanism to act.

[0012] In one embodiment, the presser foot profile surface further includes a presser foot base circle section, and the presser foot section further includes a presser foot highest section. The presser foot base circle section, the first presser foot section, the presser foot highest section and the second presser foot section are sequentially connected in a circumferential direction to form a circle; the presser foot base circle section and the presser foot highest section are both concentrically arranged with the rotation center of the cam mechanism. The first presser foot section and the second presser foot section are symmetrically arranged, and the distance between the first presser foot section and the rotation center of the cam mechanism gradually increases in the clockwise direction, and the distance between the second presser foot section and the rotation center of the cam mechanism gradually increases in the counterclockwise direction.

[0013] In one embodiment, the presser foot cam has a first presser foot zero position and a second presser foot zero position. The first presser foot zero position is at the intersection of the presser foot base circle section and the second presser foot section, and the second presser foot zero position is at the intersection of the presser foot base circle section and the first presser foot section.

[0014] In one of the embodiments, the tooth lower supply contour surface cooperates with the tooth lower supply mechanism through a tooth lower supply drive assembly;

[0015] Among them, the tooth lower supply driving component includes a tooth lower supply crank and a tooth lower supply roller, one end of the tooth lower supply crank is hinged to the tooth lower supply mechanism, and the other end of the tooth lower supply crank is connected to the tooth lower supply roller, and the tooth lower supply roller cooperates with the tooth lower supply contour surface. When the tooth lower supply cam rotates, the tooth lower supply contour surface drives the tooth lower supply crank to rotate through the tooth lower supply roller, so that the tooth lower supply crank drives the tooth lower supply mechanism to operate.

[0016] In one embodiment, the tooth lower supply contour surface includes a first transition section and a second transition section; the tooth non-lower supply section, the first transition section, the tooth lower supply section and the second transition section are connected in sequence along the circumferential direction to form a circle; the tooth non-lower supply section and the tooth lower supply section are both concentrically arranged with the rotation center of the cam mechanism, and the distance between the tooth non-lower supply section and the rotation center of the cam mechanism is greater than the distance between the tooth lower supply section and the rotation center of the cam mechanism.

[0017] In one embodiment, the tooth lower supply cam has a first lower supply zero position and a second lower supply zero position, the first lower supply zero position is located at the intersection of the tooth non-lower supply section and the first transition section, the second lower supply zero position is located on the tooth non-lower supply section and has a spacing between it and the second transition section.

[0018] In one of the embodiments, the cam mechanism also includes a thread trimming cam, which is coaxially arranged with the presser foot lifting cam and the tooth lower supply cam, and the thread trimming cam has a thread trimming contour surface, and the thread trimming contour surface is used to form a follow-up cooperation with the thread trimming mechanism to drive the thread trimming mechanism to move; the thread trimming contour surface includes a thread trimming base circle segment, a first thread trimming transition segment, a thread trimming segment and a second thread trimming transition segment which are connected in sequence along the circumferential direction to form a circle.

[0019] In one of the embodiments, the thread cutting contour surface cooperates with the thread cutting mechanism through a thread cutting drive assembly;

[0020] Wherein, the thread trimming drive assembly includes a thread trimming lever and a thread trimming roller, the thread trimming lever is hinged on the casing, one end of the thread trimming lever is transmission connected to the thread trimming mechanism, the other end of the thread trimming lever is connected to the thread trimming roller, the thread trimming roller cooperates with the thread trimming contour surface, when the thread trimming cam rotates, the thread trimming contour surface drives the thread trimming lever to rotate through the thread trimming roller, so that the thread trimming lever drives the thread trimming mechanism to operate.

[0021] In one embodiment, the wire cutting base circle segment and the wire cutting segment are both concentrically arranged with the rotation center of the cam mechanism. The first wire cutting transition segment and the second wire cutting transition segment are symmetrically arranged. The wire cutting segment, the first wire cutting transition segment, and the second wire cutting transition segment all protrude away from the wire cutting base circle segment. Moreover, the height between the first wire cutting transition segment and the wire cutting base circle segment gradually increases in the clockwise direction, and the height between the second wire cutting transition segment and the wire cutting base circle segment gradually increases in the counterclockwise direction. The wire cutting cam has a first wire cutting zero position and a second wire cutting zero position. The first wire cutting zero position is at the intersection point of the wire cutting base circle segment and the second wire cutting transition segment, and the second wire cutting zero position is at the intersection point of the wire cutting base circle segment and the first wire cutting transition segment.

[0022] The present application also provides a control method for the presser foot and tooth feeding adjustment device of the sewing machine as described above, including the following steps:

[0023] In the first working mode, the driving mechanism is used to drive the cam mechanism to rotate counterclockwise, so that the presser foot mechanism forms a follow-up cooperation with the second presser foot lifting segment, and at the same time, the tooth lower feeding mechanism forms a follow-up cooperation with the tooth lower feeding segment;

[0024] The driving mechanism is used to drive the cam mechanism to continue rotating counterclockwise, so that the presser foot mechanism moves from the first presser foot lifting segment to the initial position, and at the same time, the tooth lower feeding mechanism moves from the tooth lower feeding segment to the tooth non-lowering feeding segment;

[0025] In the second working mode, the driving mechanism is used to drive the cam mechanism to rotate clockwise, so that the presser foot mechanism forms a follow-up cooperation with the second presser foot lifting segment, and at the same time, the tooth lower feeding mechanism forms a follow-up cooperation with the tooth non-lowering feeding segment.

[0026] The present application also provides a sewing machine, including a presser foot mechanism, a wire cutting mechanism, a tooth lower feeding mechanism, and the sewing machine presser foot and tooth feeding adjustment device as described above.

[0027] In the above solution, the driving mechanism can drive the presser foot cam and the tooth lower feeding cam of the cam mechanism at the same time. Moreover, the presser foot mechanism forms a follow-up cooperation with the presser foot profile surface of the presser foot cam, and the tooth lower feeding mechanism forms a follow-up cooperation with the tooth lower feeding profile surface of the tooth lower feeding cam. Thus, the driving mechanism can drive the presser foot mechanism and the tooth lower feeding mechanism to act at the same time. And by designing the profile curves of the presser foot profile surface and the tooth lower feeding profile surface, it can be ensured that before starting sewing, the presser foot mechanism and the tooth lower feeding mechanism can act separately, so that the material placing space can be increased, which is convenient for placing the fabric. And during sewing, the presser foot mechanism can act, and the tooth lower feeding mechanism does not act, which can ensure that the stitch is not affected and improve the sewing efficiency. Description of the Drawings

[0028] Figure 1 Structural schematic diagram of the presser foot lifting and tooth adjusting device of the sewing machine shown in an embodiment of the present invention;

[0029] Figure 2 Connection structural schematic diagram of the presser foot mechanism, presser foot lifting drive assembly, lower tooth feeding mechanism, lower tooth feeding drive assembly, cam mechanism and drive mechanism shown in an embodiment of the present invention;

[0030] Figure 3 Structural schematic diagram of the thread cutting mechanism, thread cutting drive assembly, cam mechanism and drive mechanism shown in an embodiment of the present invention;

[0031] Figure 4 Structural schematic diagram of the presser foot lifting cam and presser foot profile surface shown in an embodiment of the present invention;

[0032] Figure 5 Structural schematic diagram of the lower tooth feeding cam and lower tooth feeding profile surface shown in an embodiment of the present invention;

[0033] Figure 6 Structural schematic diagram of the thread cutting cam and thread cutting profile surface shown in an embodiment of the present invention;

[0034] Figure 7 Left view structural diagram of the cam mechanism shown in an embodiment of the present invention.

[0035] Explanation of the reference numerals in the drawings:

[0036] 10. Presser foot lifting and tooth adjusting device of the sewing machine; 100. Sewing machine; 110. Machine shell; 120. Presser foot mechanism; 121. Presser foot shaft; 122. Presser foot bracket; 123. Presser foot connecting piece; 124. Presser foot limiting piece; 125. Presser foot hook; 130. Thread cutting mechanism; 131. Thread cutting assembly; 132. Thread cutting crank; 133. Pulley; 134. Crank pin; 140. Lower tooth feeding mechanism; 141. Eccentric shaft; 142. Bush; 143. Eccentric part;

[0037] 200. Cam mechanism; 210. Presser foot lifting cam; 211. Presser foot lifting profile surface; 2111. Presser foot base circle section; 2112. First presser foot section; 2113. Presser foot highest section; 2114. Second presser foot section; 212. First presser foot zero position; 213. Second presser foot zero position; 220. Teeth lower supply cam; 221. Teeth lower supply profile surface; 2211. Teeth non-lower supply section; 2212. First transition section; 2213. Teeth lower supply section; 2214. Second transition section; 222. First lower supply zero position; 223. Second lower supply zero position; 230. Thread cutting cam; 231. Thread cutting profile surface; 2311. Thread cutting base circle section; 2312. First thread cutting transition section; 2313. Thread cutting section; 2314. Second thread cutting transition section; 232. First thread cutting zero position; 233. Second thread cutting zero position;

[0038] 300. Driving mechanism; 310. Driving motor; 320. Driving mounting seat; 400. Presser foot driving assembly; 410. Presser foot lever; 420. Presser foot roller; 500. Teeth lower supply driving assembly; 510. Teeth lower supply crank; 520. Teeth lower supply roller; 600. Thread cutting driving assembly; 610. Thread cutting lever; 611. Sliding groove; 620. Thread cutting roller; 630. Connecting piece. Detailed implementation manners

[0039] In order to make the above objects, features, and advantages of the present invention more obvious and understandable, the following will describe the detailed implementation manners of the present invention in conjunction with the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0040] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0041] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0042] In the present invention, unless otherwise clearly specified and defined, terms such as "mounted", "connected", "coupled", "fixed", etc. shall be construed in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0043] In the present invention, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may mean that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0044] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0045] See Figure 1 and Figure 2As shown, one embodiment of the present application relates to a sewing machine presser foot lifting and tooth adjustment device 10, which is arranged on a sewing machine 100. The sewing machine 100 includes a housing 110, a presser foot mechanism 120, a thread trimming mechanism 130, and a tooth lower supply mechanism 140, and the presser foot mechanism 120, the thread trimming mechanism 130 and the tooth lower supply mechanism 140 are all arranged on the housing 110. The sewing machine presser foot lifting and tooth adjustment device 10 includes a cam mechanism 200 and a driving mechanism 300. The driving mechanism 300 is used to drive the cam mechanism 200 to rotate, and the cam mechanism 200 cooperates with the presser foot mechanism 120, the thread trimming mechanism 130 and the tooth lower supply mechanism 140 to respectively drive the presser foot mechanism 120, the thread trimming mechanism 130 and the tooth lower supply mechanism 140 to move.

[0046] The sewing machine 100 also includes a needle plate arranged on the housing 110 and a cloth feeding mechanism connected to the lower tooth feeding mechanism 140. The cloth feeding mechanism includes a cloth feeding tooth rack, a cloth feeding tooth arranged on the cloth feeding tooth rack, a differential tooth rack and a differential tooth arranged on the differential tooth rack. The lower tooth feeding mechanism 140 is connected to the cloth feeding tooth rack and the differential tooth rack. When the lower tooth feeding mechanism 140 is in motion, it can drive the cloth feeding tooth and the differential tooth to drop below the upper surface of the needle plate or to be flush with the upper surface of the needle plate. It should be noted that the lower tooth feeding mentioned in this article means that the teeth drop from the highest point to below the upper surface of the needle plate or to be flush with the upper surface of the needle plate, and the teeth include the above-mentioned cloth feeding teeth and differential teeth. The teeth are not lowered, which means that the teeth are in the initial position.

[0047] See also Figure 1 , Figure 2 , Figure 6 and Figure 7 As shown, the cam mechanism 200 includes a presser foot lifting cam 210, a tooth lower supply cam 220 and a thread trimming cam 230 which are coaxially arranged. The presser foot lifting cam 210 has a presser foot lifting contour surface 211, which is used to form a follow-up cooperation with the presser foot mechanism 120 to drive the presser foot mechanism 120 to move. The tooth lower supply cam 220 has a tooth lower supply contour surface 221, which is used to form a follow-up cooperation with the tooth lower supply mechanism 140 to drive the tooth lower supply mechanism 140 to move. The thread trimming cam 230 has a thread trimming contour surface 231, which is used to form a follow-up cooperation with the thread trimming mechanism 130 to drive the thread trimming mechanism 130 to move.

[0048] Specifically, the tooth lower supply contour surface 221 includes a tooth non-lower supply section 2211 and a tooth lower supply section 2213. The presser foot lifting contour surface 221 includes at least a presser foot lifting section, and the presser foot lifting section includes a first presser foot lifting section 2112 and a second presser foot lifting section 2114 corresponding to the tooth non-lower supply section 2211 and the tooth lower supply section 2213. The driving mechanism 300 is used to drive the cam mechanism 200 to rotate.

[0049] In the first working mode, when the presser foot mechanism 120 is in follow-up cooperation with the second presser foot lifting section 2114, the lower tooth feeding mechanism 140 forms a follow-up cooperation with the lower tooth feeding section 2213. In the second working mode, when the presser foot mechanism 120 is in follow-up cooperation with the first presser foot lifting section 2112, the lower tooth feeding mechanism 140 forms a follow-up cooperation with the non-lower tooth feeding section 2211. It should be understood that: the first working mode refers to before the sewing machine 100 starts sewing, and the second working mode refers to during the sewing process of the sewing machine 100. In this embodiment, the driving mechanism 300 includes a driving motor 310 and a driving mounting base 320, and the driving mechanism 300 is fixedly connected to the machine housing 110 through the driving mounting base 320.

[0050] See Figure 1 、 Figure 2 and Figure 7 As shown, the presser foot lifting profile surface 211 is matched with the presser foot mechanism 120 through the presser foot driving assembly 400. Specifically, the presser foot driving assembly 400 includes a presser foot lever 410 and a presser foot roller 420, and the presser foot lever 410 is in transmission connection with the presser foot mechanism 120. One end of the presser foot lever 410 is hinged. The other end of the presser foot lever 410 is connected to the presser foot roller 420. The presser foot roller 420 is matched with the presser foot lifting profile surface 211. When the presser foot cam 210 rotates, the presser foot lifting profile surface 211 drives the presser foot lever 410 to rotate through the presser foot roller 420, so that the presser foot lever 410 drives the presser foot mechanism 120 to act. Specifically, one end of the presser foot lever 410 can be hinged to the machine housing 110 or to the driving mounting base 320. In this embodiment, one end of the presser foot lever 410 is hinged to the driving mounting base 320.

[0051] The presser foot mechanism 120 is used to press the fabric conveyed by the feeding mechanism. The presser foot mechanism 120 includes a presser foot shaft 121, a presser foot bracket 122, a presser foot, a presser foot connecting piece 123, a presser foot limiting piece 124, and a presser foot hook 125. The first end of the presser foot shaft 121 is hinged to the first end of the presser foot bracket 122, and the second end of the presser foot bracket 122 is connected to the presser foot. The first end of the presser foot connecting piece 123 is sleeved on the second end of the presser foot shaft 121 and is rotatably connected to the second end of the presser foot shaft 121. The presser foot limiting piece 124 is fixedly arranged at the second end of the presser foot shaft 121, a first protrusion is formed on the presser foot limiting piece 124, and a second protrusion is formed at the first end of the presser foot connecting piece 123, and the first protrusion and the second protrusion can abut against each other. A first mounting hole is arranged at the second end of the presser foot connecting piece 123, and a second mounting hole is arranged on the presser foot lever 410. The first end of the presser foot hook 125 is hooked in the first mounting hole, and the second end of the presser foot hook 125 is hooked in the second mounting hole.

[0052] A spring is provided at the fulcrum of the presser foot shaft 121 or the lifter presser foot drive assembly 400. One end of the spring is fixed to the presser foot bracket 122 or the machine housing 110, and the other end of the spring hooks the lifter presser foot lever 410 or the presser foot connecting member 123 to ensure that the roller 420 always contacts the lifter presser foot profile surface 211.

[0053] When the lifter presser foot lever 410 acts, it can drive the presser foot connecting member 123 to rotate around the presser foot shaft 121 through the presser foot hook 125. At this time, the first protrusion of the presser foot limit member 124 abuts against the second protrusion of the presser foot connecting member 123. Under the cooperation of the second protrusion of the presser foot connecting member 123 and the first protrusion of the presser foot limit member 124, the presser foot limit member 124 and the presser foot shaft 121 can be driven to rotate, so that the presser foot bracket 122 and the presser foot are lifted.

[0054] When the presser foot bracket 122 and the presser foot are lifted, the presser foot shaft 121 can be driven to rotate, and the first protrusion of the presser foot limit member 124 is separated from the second protrusion of the presser foot connecting member 123. When the first protrusion of the presser foot limit member 124 is separated from the second protrusion of the presser foot connecting member 123, the rotation of the presser foot shaft 121 cannot drive the presser foot connecting member 123 to rotate around the presser foot shaft 121, nor can it drive the presser foot hook 125 and the lifter presser foot lever 410 to rotate. This can make the presser foot bracket 122 and the presser foot float up and down during the sewing process of the sewing machine 100, and will not cause the presser foot hook 125 and the lifter presser foot lever 410 to shake.

[0055] See Figure 1 、 Figure 2 、 Figure 4 and Figure 7 As shown in, the lifter presser foot profile surface 211 further includes a lifter presser foot base circle section 2111, and the lifter presser foot section further includes a lifter presser foot highest section 2113. The lifter presser foot base circle section 2111, the first lifter presser foot section 2112, the lifter presser foot highest section 2113 and the second lifter presser foot section 2114 are sequentially connected in a circumferential direction to form a circle. The lifter presser foot base circle section 2111 and the lifter presser foot highest section 2113 are both concentrically arranged with the rotation center of the cam mechanism 200. The first lifter presser foot section 2112 and the second lifter presser foot section 2114 are symmetrically arranged, and the distance between the first lifter presser foot section 2112 and the rotation center of the cam mechanism 200 gradually increases in the clockwise direction, and the distance between the second lifter presser foot section 2114 and the rotation center of the cam mechanism 200 gradually increases in the counterclockwise direction.

[0056] It should be understood that the presser foot mechanism 120 has an initial position and a highest presser foot position. When the presser foot lifting roller 420 is at the presser foot base circle section 2111, the presser foot mechanism 120 is at the initial position. At this time, the presser foot support 122 and the presser foot are at the initial position. When the presser foot lifting roller 420 is at the highest presser foot section 2113, the presser foot mechanism 120 is at the highest presser foot position. At this time, the presser foot support 122 and the presser foot are at the highest position. When the presser foot lifting roller 420 moves from the presser foot base circle section 2111 through the first presser foot lifting section 2112 or the second presser foot lifting section 2114 to the highest presser foot section 2113, the presser foot mechanism 120 moves from the initial position to the highest presser foot position.

[0057] It should be further understood that when the presser foot lifting roller 420 moves from the presser foot base circle section 2111 through the first presser foot lifting section 2112 or the second presser foot lifting section 2114 to the highest presser foot section 2113, this process is for lifting the presser foot. During this process, the driving mechanism 300 can drive the cam mechanism 200 to rotate clockwise or counterclockwise. Specifically, when the presser foot lifting roller 420 moves from the presser foot base circle section 2111 through the first presser foot lifting section 2112 to the highest presser foot section 2113, the driving mechanism 300 drives the cam mechanism 200 to rotate clockwise. When the presser foot lifting roller 420 moves from the presser foot base circle section 2111 through the second presser foot lifting section 2114 to the highest presser foot section 2113, the driving mechanism 300 drives the cam mechanism 200 to rotate counterclockwise.

[0058] When the presser foot lifting roller 420 moves from the highest presser foot section 2113 through the first presser foot lifting section 2112 or the second presser foot lifting section 2114 to the presser foot base circle section 2111, the presser foot mechanism 120 moves from the highest presser foot position to the initial position. This process is for the presser foot to return to its original position. The working principle of the presser foot returning to its original position is opposite to that of lifting the presser foot.

[0059] See Figure 1 、 Figure 2 and Figure 7As shown, the tooth lower supply contour surface 221 cooperates with the tooth lower supply mechanism 140 through the tooth lower supply drive assembly 500. Specifically, the tooth lower supply drive assembly 500 includes a tooth lower supply crank 510 and a tooth lower supply roller 520, and one end of the tooth lower supply crank 510 is hinged to the tooth lower supply mechanism 140. The other end of the tooth lower supply crank 510 is connected to the tooth lower supply roller 520. The tooth lower supply roller 520 cooperates with the tooth lower supply contour surface 221. When the tooth lower supply cam 220 rotates, the tooth lower supply contour surface 221 drives the tooth lower supply crank 510 to rotate through the tooth lower supply roller 520, so that the tooth lower supply crank 510 drives the tooth lower supply mechanism 140 to operate. More specifically, a return torsion spring is provided on the eccentric shaft 141 , one end of which is fixed to the housing 110 , and the other end is hung on the lower supply crank 510 . The spring ensures that the lower supply roller 520 is always in contact with the lower supply contour surface 221 .

[0060] The tooth lower feeding mechanism 140 includes an eccentric shaft 141 and a sleeve 142, and the eccentric shaft 141 is rotatably connected to the housing 110 through the sleeve 142. Specifically, one end of the tooth lower feeding crank 510 is hinged to the first end of the eccentric shaft 141. The second end of the eccentric shaft 141 is formed with an eccentric portion 143, and the eccentric portion 143 is transmission-connected to the cloth feed tooth frame and the differential tooth frame through a linkage assembly. When the tooth lower feeding crank 510 is actuated, it can drive the eccentric shaft 141 to rotate, so as to drive the cloth feed tooth frame and the differential tooth frame to move, thereby driving the tooth lower feeding or returning to the initial position.

[0061] See also Figure 1 , Figure 2 , Figure 5 and Figure 7 As shown, the tooth lower supply contour surface 221 also includes a first transition section 2212 and a second transition section 2214; the tooth non-lower supply section 2211, the first transition section 2212, the tooth lower supply section 2213, and the second transition section 2214 are sequentially connected along the circumferential direction to form a circle, and the tooth non-lower supply section 2211 and the tooth lower supply section 2213 are both concentrically arranged with the rotation center of the cam mechanism 200, and the distance between the tooth non-lower supply section 2211 and the rotation center of the cam mechanism 200 is greater than the distance between the tooth lower supply section 2213 and the rotation center of the cam mechanism 200. The length of the tooth lower supply is less than the length of the tooth non-lower supply section 2211.

[0062] It should be understood that the tooth lower supply mechanism 140 has a tooth non-lowering supply position and a tooth lowering supply position. When the tooth lower supply roller 520 is at the tooth non-lowering supply section 2211, the tooth lower supply mechanism 140 is at the tooth non-lowering supply position. At this time, the tooth is at the initial position. When the tooth lower supply roller 520 is at the tooth lowering supply section 2213, the tooth lower supply mechanism 140 is at the tooth lowering supply position. At this time, the tooth is at the tooth lowering supply position. When the tooth lower supply roller 520 moves from the tooth non-lowering supply section 2211 to the tooth lowering supply section 2213 via the first transition section 2212 or the second transition section 2214, the tooth lower supply mechanism 140 moves from the tooth non-lowering supply position to the tooth lowering supply position.

[0063] It should be further understood that the tooth lower supply roller 520 moves from the tooth non-lowering supply section 2211 to the tooth lowering supply section 2213 via the first transition section 2212 or the second transition section 2214, and this process is the tooth lower supply. During this process, the drive mechanism 300 can drive the cam mechanism 200 to rotate clockwise or counterclockwise. Specifically, when the tooth lower supply roller 520 moves from the tooth non-lowering supply section 2211 to the tooth lowering supply section 2213 via the first transition section 2212, the drive mechanism 300 drives the cam mechanism 200 to rotate clockwise. When the tooth lower supply roller 520 moves from the tooth non-lowering supply section 2211 to the tooth lowering supply section 2213 via the second transition section 2214, the drive mechanism 300 drives the cam mechanism 200 to rotate counterclockwise.

[0064] When the tooth lower supply roller 520 moves from the tooth lowering supply section 2213 to the tooth non-lowering supply section 2211 via the first transition section 2212 or the second transition section 2214, the tooth lower supply mechanism 140 moves from the tooth lowering supply position to the tooth non-lowering supply position. This process is the tooth reset. The working principle of the tooth reset is opposite to that of the tooth lower supply.

[0065] See Figure 1 、 Figure 3 and Figure 6As shown, the trimming profile surface 231 cooperates with the trimming mechanism 130 through the trimming drive assembly 600. Specifically, the trimming drive assembly 600 includes a trimming lever 610 and a trimming roller 620, and the trimming lever 610 is hingedly arranged on the housing 110. One end of the trimming lever 610 is transmission-connected with the trimming mechanism 130, and the other end of the trimming lever 610 is connected with the trimming roller 620. The trimming roller 620 cooperates with the trimming profile surface 231. When the trimming cam 230 rotates, the trimming profile surface 231 drives the trimming lever 610 to rotate through the trimming roller 620, so that the trimming lever 610 drives the trimming mechanism 130 to operate. More specifically, the trimming lever 610 is rotatably connected to the housing 110 through a connecting member 630, and a sliding groove 611 is formed at one end of the trimming lever 610. The spring is sleeved on the circular boss of the thread trimming lever 610, one end of which is fixed on the housing 110, and the other end of the spring continuously applies pressure to 610, so that the thread trimming roller 620 is always in contact with the thread trimming contour surface 231. More specifically, a mounting hole is formed on the thread trimming lever 610, and the connecting member 630 is passed through the mounting hole and fixedly connected to the housing 110. The thread trimming lever 610 is rotatably connected to the connecting member 630. The connecting member 630 adopts a cylindrical structure.

[0066] The thread trimming mechanism 130 includes a thread trimming assembly 131, a thread trimming crank 132 and a pulley 133. The pulley 133 is embedded in the sliding groove 611 and is arranged relatively to the sliding groove 611 and is not disengaged. The pulley 133 can be slidably connected to the sliding groove 611. The first end of the thread trimming crank 132 is connected to the thread trimming assembly 131, and the second end of the thread trimming crank 132 is fixedly connected to the pulley 133 through a crank pin 134. When the thread trimming lever 610 is actuated, the thread trimming crank 132 can be driven to rotate, thereby driving the thread trimming assembly 131 to complete thread trimming.

[0067] The thread cutting contour surface 231 includes a thread cutting base circle segment 2311, a first thread cutting transition segment 2312, a thread cutting segment 2313 and a second thread cutting transition segment 2314 which are connected in sequence along the circumferential direction to form a circle. The thread cutting base circle segment 2311 described here means that when the thread cutting roller 620 is in this segment of the contour, the thread cutting mechanism 130 is in the initial position and does not move or is in the thread cutting position and does not move.

[0068] The thread-cutting base circle segment 2311 and the thread-cutting segment 2313 can be arranged concentrically with the rotation center of the cam mechanism 200, and the thread-cutting base circle segment 2311 can also be arranged at the same height plane as the axial direction of the driving mechanism 300. In this embodiment, the thread-cutting base circle segment 2311 and the thread-cutting segment 2313 are arranged at the same height plane as the axial direction of the driving mechanism 300. That is, the thread-cutting base circle segment 2311 and the thread-cutting segment 2313 have different heights relative to the same height plane as the axial direction of the driving mechanism 300.

[0069] The first wire cutting transition section 2312 and the second wire cutting transition section 2314 are symmetrically arranged. The wire cutting segment 2313, the first wire cutting transition section 2312 and the second wire cutting transition section 2314 all protrude away from the wire cutting base circle segment 2311. Moreover, the height between the first wire cutting transition section 2312 and the wire cutting base circle segment 2311 gradually increases in the clockwise direction, and the height between the second wire cutting transition section 2314 and the wire cutting base circle segment 2311 gradually increases in the counterclockwise direction.

[0070] It should be understood that: the wire cutting mechanism 130 has an initial position and a wire cutting position. When the wire cutting roller 620 is at the wire cutting base circle segment 2311, the wire cutting mechanism 130 is in the initial position. At this time, the wire cutting assembly 131 is in the initial position. When the wire cutting roller 620 is at the wire cutting segment 2313, the wire cutting mechanism 130 is in the wire cutting position. At this time, the wire cutting assembly 131 is in the wire cutting position. When the wire cutting roller 620 moves from the wire cutting base circle segment 2311 through the first wire cutting transition section 2312 or the second wire cutting transition section 2314 to the wire cutting segment 2313, the wire cutting mechanism 130 moves from the initial position to the wire cutting position.

[0071] It should be further understood that: when the wire cutting roller 620 moves from the wire cutting base circle segment 2311 through the first wire cutting transition section 2312 or the second wire cutting transition section 2314 to the wire cutting segment 2313, this process is wire cutting. During this process, the driving mechanism 300 can drive the cam mechanism 200 to rotate clockwise or counterclockwise. Specifically, when the wire cutting roller 620 moves from the wire cutting base circle segment 2311 through the first wire cutting transition section 2312 to the wire cutting segment 2313, the driving mechanism 300 drives the cam mechanism 200 to rotate clockwise. When the wire cutting roller 620 moves from the wire cutting base circle segment 2311 through the second wire cutting transition section 2314 to the wire cutting segment 2313, the driving mechanism 300 drives the cam mechanism 200 to rotate counterclockwise.

[0072] When the wire cutting roller 620 moves from the wire cutting segment 2313 through the first wire cutting transition section 2312 or the second wire cutting transition section 2314 to the wire cutting base circle segment 2311, the wire cutting mechanism 130 moves from the wire cutting position to the initial position. This process is wire cutting reset. The working principle of wire cutting reset is opposite to that of wire cutting.

[0073] See Figure 4 As shown, the presser foot lifting cam 210 has a first presser foot zero position 212 and a second presser foot zero position 213. The first presser foot zero position 212 is at the intersection of the presser foot base circle segment 2111 and the second presser foot segment 2114, and the second presser foot zero position 213 is at the intersection of the presser foot base circle segment 2111 and the first presser foot segment 2112.

[0074] See Figure 5As shown, the lower tooth feeding cam 220 has a first lower feeding zero position 222 and a second lower feeding zero position 223. The first lower feeding zero position 222 is at the intersection point of the tooth non-feeding section 2211 and the first transition section 2212. The second lower feeding zero position 223 is on the tooth non-feeding section 2211 and has a spacing from the second transition section 2214.

[0075] See Figure 6 As shown, the thread cutting cam 230 has a first thread cutting zero position 232 and a second thread cutting zero position 233. The first thread cutting zero position 232 is at the intersection point of the thread cutting base circle section 2311 and the second thread cutting transition section 2314. The second thread cutting zero position 233 is at the intersection point of the thread cutting base circle section 2311 and the first thread cutting transition section 2312.

[0076] See Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 As shown, when the presser foot lifting roller 420 moves from the first presser foot lifting zero position 212 through the second presser foot lifting section 2114 to the presser foot highest section 2113, the lower tooth feeding roller 520 moves from the first lower feeding zero position 222 through the first transition section 2212 to the tooth lower feeding section 2213, and the thread cutting roller 620 moves from the first thread cutting zero position 232 to the thread cutting base circle section 2311.

[0077] When the presser foot lifting roller 420 moves from the presser foot highest section 2113 through the first presser foot lifting section 2112 to the second presser foot lifting zero position 213, the lower tooth feeding roller 520 moves from the tooth lower feeding section 2213 through the second transition section 2214 to the second lower feeding zero position 223, and the thread cutting roller 620 moves to the second thread cutting zero position 233.

[0078] When the presser foot lifting roller 420 moves from the second presser foot lifting zero position 213 through the presser foot base circle section 2111 to the first presser foot lifting zero position 212, the lower tooth feeding roller 520 moves from the second lower feeding zero position 223 through the tooth non-feeding section 2211 to the first lower feeding zero position 222. After the thread cutting roller 620 completes the thread cutting action through the second thread cutting zero position 233, through the first thread cutting transition section 2312 to the thread cutting section 2313, and then moves to the first thread cutting zero position 232 through the second thread cutting transition section 2314.

[0079] See Figure 1As shown, the presser foot and tooth adjusting device 10 of the sewing machine further includes a fabric sensing mechanism and a control module. The fabric sensing mechanism is arranged on the thread cutting mechanism 130 and is used to detect whether the fabric reaches the set position. The control module is communicatively connected to the fabric sensing mechanism and controls the connection to the driving mechanism 300. The control module is used to achieve automatic control. For example, a PLC can be used, or an MCS-51 single-chip microcomputer can also be used. The fabric sensing mechanism can adopt an infrared sensor, an ultrasonic sensor, a pressure sensor, etc., as long as it can achieve the function of detecting whether the fabric reaches the set position.

[0080] The present application also provides a control method for the presser foot and tooth adjusting device 10 of the sewing machine as described above, including the following steps:

[0081] In the first working mode, the driving mechanism 300 is used to drive the cam mechanism 200 to rotate counterclockwise, so that the presser foot mechanism 120 forms a follow-up cooperation with the second presser foot lifting section 2114, and at the same time, the tooth lower supply mechanism 140 forms a follow-up cooperation with the tooth lower supply section 2213.

[0082] Among them, the first working mode means that before the sewing machine 100 starts sewing, the driving mechanism 300 drives the cam mechanism 200 to rotate counterclockwise to drive the presser foot roller 420 to move from the first presser foot zero position 212 through the second presser foot section 2114 to the presser foot highest section 2113, so that the presser foot bracket 122 and the presser foot move from the initial position to the presser foot highest position. When the presser foot roller 420 moves from the first presser foot zero position 212 through the second presser foot section 2114 to the presser foot highest section 2113, the tooth lower supply roller 520 moves from the first lower supply zero position 222 through the first transition section 2212 to the tooth lower supply section 2213, so that the tooth lower supply mechanism 140 moves from the tooth non-lower supply position to the tooth lower supply position, thereby enabling the tooth lower supply. At the same time, the thread cutting roller 620 moves from the first thread cutting zero position 232 to the thread cutting base circle section 2311, and the thread cutting mechanism 130 does not act. The distance between the teeth and the presser foot bracket 122 and the presser foot increases, which can increase the material placement space and facilitate the placement of the fabric.

[0083] The driving mechanism 300 drives the cam mechanism 200 to continue rotating counterclockwise, so that the presser foot mechanism 120 moves from the first presser foot section 2112 to the initial position, and at the same time, the tooth lower supply mechanism 140 moves from the tooth lower supply section 2213 to the tooth non-lower supply section 2211.

[0084] Among them, the driving mechanism 300 drives the cam mechanism 200 to continue rotating counterclockwise, so as to drive the presser foot lifting roller 420 to move from the highest presser foot section 2113 through the first presser foot section 2112 to the second presser foot zero position 213, so that the presser foot support 122 and the presser foot move from the highest presser foot position to the initial position, so as to reset the presser foot support 122 and the presser foot. When the presser foot lifting roller 420 moves from the highest presser foot section 2113 through the first presser foot section 2112 to the second presser foot zero position 213, the tooth lower supply roller 520 moves from the tooth lower supply section 2213 through the second transition section 2214 to the second lower supply zero position 223, so that the tooth lower supply mechanism 140 moves from the tooth lower supply position to the tooth non-lower supply position, thereby resetting the teeth. At the same time, the thread cutting roller 620 is moved to the second thread cutting zero position 233. Therefore, the thread cutting mechanism 130 does not act.

[0085] In the second working mode, the driving mechanism 300 drives the cam mechanism to rotate clockwise, so that the presser foot mechanism 120 forms a follow-up cooperation with the presser foot lifting section, and at the same time, the tooth lower supply mechanism 140 forms a follow-up cooperation with the tooth non-lower supply section 2211. Among them, the second working mode refers to the sewing process of the sewing machine 100. Before the sewing machine 100 starts sewing, the fabric sensing mechanism detects whether the fabric reaches the set position. When the fabric sensing mechanism detects that the fabric reaches the set position, the control module controls the driving mechanism 300 to operate.

[0086] The driving mechanism 300 drives the cam mechanism 200 to rotate clockwise, so as to drive the thread cutting roller 620 to move from the second thread cutting zero position 233 through the first thread cutting transition section 2312 to the thread cutting section 2313, so that the thread cutting mechanism 130 moves from the initial position to the thread cutting position, so that the thread cutting assembly 131 moves to the thread cutting position for front thread cutting. When the thread cutting roller 620 is at the thread cutting section 2313, the presser foot lifting roller 420 is at the presser foot base circle section 2111, and the tooth lower supply roller 520 is at the tooth non-lower supply section 2211, so that the presser foot support 122 and the presser foot are in the initial position, and the teeth are in the tooth non-lower supply position. During the thread cutting process of the thread cutting mechanism 130, neither the tooth lower supply mechanism 140 nor the presser foot mechanism 120 acts. After the front thread cutting is completed, the driving mechanism 300 drives the cam mechanism 200 to rotate counterclockwise, so as to drive the thread cutting roller 620 to move from the thread cutting section 2313 through the first thread cutting transition section 2312 to the second thread cutting zero position 233, so that the thread cutting mechanism 130 returns to the initial position.

[0087] When the fabric leaves, the fabric sensing mechanism cannot detect the fabric. When the fabric sensing mechanism detects that the fabric has left, the control module controls the driving mechanism 300 to operate.

[0088] Among them, the driving mechanism 300 drives the cam mechanism 200 to rotate clockwise, so as to drive the thread cutting roller 620 to move from the second thread cutting zero position 233 through the first thread cutting transition section 2312 to the thread cutting section 2313, enabling the thread cutting mechanism 130 to move from the initial position to the thread cutting position, and thus enabling the thread cutting assembly 131 to move to the thread cutting position for post-thread cutting. After the post-thread cutting is completed, the driving mechanism 300 drives the cam mechanism 200 to continue rotating clockwise, so as to drive the thread cutting roller 620 to move from the thread cutting section 2313 through the second thread cutting transition section 2314 to the first thread cutting zero position 232, causing the thread cutting mechanism 130 to return to the initial position. When the thread cutting roller 620 moves from the thread cutting section 2313 through the second thread cutting transition section 2314 to the first thread cutting zero position 232, the tooth lower supply roller 520 moves from the second lower supply zero position 223 through the tooth non-lower supply section 2211 to the first lower supply zero position 222, and the presser foot lifting roller 420 moves from the second presser foot lifting zero position 213 through the presser foot base circle section 2111 to the first presser foot lifting zero position 212.

[0089] In the second working mode, the driving mechanism 300 drives the cam mechanism 200 to rotate clockwise, enabling the presser foot mechanism 120 to form a follow-up cooperation with the first presser foot lifting section 2112, and at the same time enabling the tooth lower supply mechanism 140 to form a follow-up cooperation with the tooth non-lower supply section 2211. Among them, the second working mode refers to the sewing process of the sewing machine 100. During the sewing process of the sewing machine 100, when it is necessary to lift the presser foot support 122 and the presser foot, the driving mechanism 300 operates to drive the cam mechanism 200 to rotate.

[0090] Among them, the driving mechanism 300 drives the cam mechanism 200 to rotate clockwise, so as to drive the presser foot lifting roller 420 to move from the second presser foot lifting zero position 213 through the first presser foot lifting section 2112 to the presser foot highest section 2113, enabling the presser foot support 122 and the presser foot to move from the initial position to the presser foot highest position. When the presser foot lifting roller 420 moves from the second presser foot lifting zero position 213 through the first presser foot lifting section 2112 to the presser foot highest section 2113, the tooth lower supply roller 520 moves from the second lower supply zero position 223 to a position close to the second transition section 2214 of the tooth non-lower supply section 2211. At this time, the presser foot support 122 and the presser foot are lifted, and the tooth lower supply mechanism 140 is in the tooth non-lower supply position. The presser foot mechanism 120 acts, and the tooth lower supply mechanism 140 does not act, which can ensure that the stitch is not affected. When the presser foot lifting roller 420 is at the presser foot highest section 2113, the thread cutting roller 620 is at the thread cutting base circle section 2311, and the thread cutting mechanism 130 does not act.

[0091] The present application also provides a sewing machine 100, including a presser foot mechanism 120, a thread cutting mechanism 130, a tooth lower supply mechanism 140, and the sewing machine presser foot lifting and tooth adjusting device 10 as described above.

[0092] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0093] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A presser foot lifting and tooth adjusting device for a sewing machine, the sewing machine comprising a machine shell, a presser foot mechanism arranged on the machine shell, and a tooth feeding mechanism below the teeth, characterized in that, The sewing machine presser foot lifting and thread adjustment device comprises: A cam mechanism, wherein the cam mechanism comprises a coaxially arranged presser foot lifting cam and a tooth lower supply cam, wherein the presser foot lifting cam has a presser foot lifting contour surface, and is used to form a follow-up cooperation with the presser foot mechanism to drive the presser foot mechanism to move; The tooth lower supply cam has a tooth lower supply contour surface, which is used to form a follow-up cooperation with the tooth lower supply mechanism to drive the tooth lower supply mechanism to move; the tooth lower supply contour surface includes a tooth non-lower supply section and a tooth lower supply section; the presser foot lifting contour surface at least includes a presser foot lifting section, and the presser foot lifting section includes a first presser foot lifting section and a second presser foot lifting section corresponding to the tooth non-lower supply section and the tooth lower supply section respectively; A driving mechanism, the driving mechanism is used to drive the cam mechanism to rotate; Among them, in the first working mode, when the presser foot mechanism and the second presser foot lifting section cooperate with each other, the tooth lower supply mechanism and the tooth lower supply section form a follow-up cooperation; in the second working mode, when the presser foot mechanism and the first presser foot lifting section cooperate with each other, the tooth lower supply mechanism and the tooth non-lower supply section form a follow-up cooperation.

2. The presser foot lifting and tooth adjusting device of a sewing machine according to claim 1, characterized in that, The presser foot lifting contour surface cooperates with the presser foot mechanism through a presser foot lifting driving assembly; Among them, the presser foot lifting driving assembly includes a presser foot lifting lever and a presser foot lifting roller, the presser foot lifting lever is transmission connected to the presser foot mechanism, one end of the presser foot lifting lever is hinged, and the other end of the presser foot lifting lever is connected to the presser foot lifting roller, the presser foot lifting roller cooperates with the presser foot lifting contour surface, when the presser foot lifting cam rotates, the presser foot lifting contour surface drives the presser foot lifting lever to rotate through the presser foot lifting roller, so that the presser foot lifting lever drives the presser foot mechanism to operate.

3. The presser foot lifting and tooth adjusting device of a sewing machine according to claim 1, wherein, The presser foot lifting contour surface also includes a presser foot lifting base circle segment, and the presser foot lifting segment also includes a presser foot lifting highest segment. The presser foot lifting base circle segment, the first presser foot lifting segment, the presser foot lifting highest segment and the second presser foot lifting segment are sequentially connected in the circumferential direction to form a circle; the presser foot lifting base circle segment and the presser foot lifting highest segment are both concentrically arranged with the rotation center of the cam mechanism, the first presser foot lifting segment and the second presser foot lifting segment are symmetrically arranged, and the distance between the first presser foot lifting segment and the rotation center of the cam mechanism gradually increases in a clockwise direction, and the distance between the second presser foot lifting segment and the rotation center of the cam mechanism gradually increases in a counterclockwise direction.

4. The presser foot lifting and tooth adjusting device of a sewing machine according to claim 3, wherein, The presser foot lifting cam has a first presser foot lifting zero position and a second presser foot lifting zero position. The first presser foot lifting zero position is located at the intersection of the presser foot lifting base circle segment and the second presser foot lifting segment, and the second presser foot lifting zero position is located at the intersection of the presser foot lifting base circle segment and the first presser foot lifting segment.

5. The presser foot lifting and tooth adjusting device for a sewing machine according to claim 1, wherein The tooth lower supply contour surface cooperates with the tooth lower supply mechanism through a tooth lower supply drive assembly; Among them, the tooth lower supply driving component includes a tooth lower supply crank and a tooth lower supply roller, one end of the tooth lower supply crank is hinged to the tooth lower supply mechanism, and the other end of the tooth lower supply crank is connected to the tooth lower supply roller, and the tooth lower supply roller cooperates with the tooth lower supply contour surface. When the tooth lower supply cam rotates, the tooth lower supply contour surface drives the tooth lower supply crank to rotate through the tooth lower supply roller, so that the tooth lower supply crank drives the tooth lower supply mechanism to operate.

6. The presser foot lifting and tooth adjusting device of a sewing machine according to claim 1, characterized in that, The tooth lower supply contour surface includes a first transition section and a second transition section; the tooth non-lower supply section, the first transition section, the tooth lower supply section and the second transition section are connected in sequence along the circumferential direction to form a circle; the tooth non-lower supply section and the tooth lower supply section are both concentrically arranged with the rotation center of the cam mechanism, and the distance between the tooth non-lower supply section and the rotation center of the cam mechanism is greater than the distance between the tooth lower supply section and the rotation center of the cam mechanism.

7. The presser foot lifting and tooth adjusting device of a sewing machine according to claim 6, characterized in that, The tooth lower supply cam has a first lower supply zero position and a second lower supply zero position, the first lower supply zero position is located at the intersection of the tooth non-lower supply section and the first transition section, the second lower supply zero position is located on the tooth non-lower supply section and has a spacing between it and the second transition section.

8. The presser foot lifting and tooth adjusting device of a sewing machine according to claim 1, wherein, The cam mechanism also includes a thread trimming cam, which is coaxially arranged with the presser foot lifting cam and the tooth lower supply cam, and has a thread trimming contour surface, which is used to form a follow-up cooperation with the thread trimming mechanism to drive the thread trimming mechanism to move; the thread trimming contour surface includes a thread trimming base circle segment, a first thread trimming transition segment, a thread trimming segment and a second thread trimming transition segment which are sequentially connected along the circumferential direction to form a circle.

9. The presser foot lifting and tooth adjusting device of a sewing machine according to claim 8, wherein, The thread cutting contour surface cooperates with the thread cutting mechanism through a thread cutting drive assembly; Wherein, the thread trimming drive assembly includes a thread trimming lever and a thread trimming roller, the thread trimming lever is hinged on the casing, one end of the thread trimming lever is transmission connected to the thread trimming mechanism, the other end of the thread trimming lever is connected to the thread trimming roller, the thread trimming roller cooperates with the thread trimming contour surface, when the thread trimming cam rotates, the thread trimming contour surface drives the thread trimming lever to rotate through the thread trimming roller, so that the thread trimming lever drives the thread trimming mechanism to operate.

10. The presser foot lifting and tooth adjusting device of a sewing machine according to claim 8, characterized in that, The thread trimming base circle segment and the thread trimming segment are both arranged concentrically with the rotation center of the cam mechanism, the first thread trimming transition segment and the second thread trimming transition segment are symmetrically arranged, the thread trimming segment, the first thread trimming transition segment and the second thread trimming transition segment are all protruding away from the thread trimming base circle segment, and the height between the first thread trimming transition segment and the thread trimming base circle segment gradually increases in a clockwise direction, and the height between the second thread trimming transition segment and the thread trimming base circle segment gradually increases in a counterclockwise direction; the thread trimming cam has a first thread trimming zero position and a second thread trimming zero position, the first thread trimming zero position is at the intersection of the thread trimming base circle segment and the second thread trimming transition segment, and the second thread trimming zero position is at the intersection of the thread trimming base circle segment and the first thread trimming transition segment.

11. A control method for a presser foot lifting and tooth adjusting device of a sewing machine according to any one of claims 1-10, characterized in that, The following steps are involved: In the first working mode, the driving mechanism is used to drive the cam mechanism to rotate counterclockwise, so that the presser foot mechanism forms a follow-up cooperation with the second presser foot lifting section, and at the same time, the tooth lower feeding mechanism forms a follow-up cooperation with the tooth lower feeding section; The driving mechanism is used to drive the cam mechanism to continue to rotate counterclockwise, so that the presser foot mechanism moves from the first presser foot lifting section to the initial position, and at the same time, the tooth lower feeding mechanism moves from the tooth lower feeding section to the tooth non-lowering feeding section; In the second working mode, the driving mechanism is used to drive the cam mechanism to rotate clockwise, so that the presser foot mechanism forms a follow-up cooperation with the first presser foot lifting section, and at the same time, the tooth lower feeding mechanism forms a follow-up cooperation with the tooth non-lowering feeding section.

12. A sewing machine, characterized in that, It includes a presser foot mechanism, a thread cutting mechanism, a tooth lower feeding mechanism and a sewing machine presser foot lifting and tooth adjusting device as described in any one of claims 1-10.

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