Sewing machine presser foot interaction amount adjusting device

Abstract

The utility model discloses a sewing machine presser foot interaction amount adjusting device which comprises an upper shaft, an interaction amount adjusting crank, a cylindrical pin, an interaction amount adjusting mechanism and an installation mechanism, an eccentric wheel is fixed to the upper shaft and hinged to a connecting rod, and a presser foot lifting shaft is fixedly connected to the interaction amount adjusting crank; the interaction amount adjusting mechanism comprises a pneumatic telescopic assembly, an installation support, an adjusting block and an adjusting rod, the installation mechanism is fixed to the machine shell, the two sides of the installation support are hinged to the installation mechanism and the presser foot lifting shaft respectively, the pneumatic telescopic assembly is fixed in the installation support, and the adjusting block is fixedly connected with the telescopic end of the pneumatic telescopic assembly. The adjusting rod movably penetrates through the mounting bracket, one end of the adjusting rod is in threaded connection with the adjusting block, and the adjusting bracket limits the other end of the adjusting rod; according to the scheme, the swing amplitude of the crank can be manually adjusted, and the crank can be automatically and instantly adjusted to the maximum swing amplitude.

Description

TECHNICAL FIELD

[0001] The utility model relates to sewing machine technical field, concretely relates to a sewing machine presser foot interaction amount adjusting device. BACKGROUND

[0002] The user can carry out multilayer sewing in the actual sewing process, but the sewing machine in the market needs to manually disassemble the parts to adjust the presser foot interaction amount, consumes time and needs professional maintenance personnel.

[0003] The structure and implementation process of the traditional mechanism are introduced as follows: the presser foot interaction amount adjusting mechanism of the general traditional sewing machine is shown in Figure 1 , which is composed of a crank rocker mechanism A, a four-bar linkage mechanism B and a four-bar linkage mechanism C.

[0004] The specific connection structure is that the eccentric wheel 2 is fixedly connected with the upper shaft 1 through the binding screw 3; the eccentric wheel is hinged with the connecting rod 4; the connecting rod 4 is hinged with the interaction amount adjusting crank 6 through the shaft position screw 5; the hexagonal nut 7 is connected with the shaft position screw 5, which is used for fixing the position of the shaft position screw 5 on the interaction amount adjusting crank 6; the screw 8 is used for fixedly connecting the interaction amount adjusting crank 6 with the presser foot lifting shaft 9; the above-mentioned parts constitute the crank rocker mechanism A, which is the core mechanism for adjusting the presser foot interaction amount.

[0005] The following is the auxiliary execution mechanism of the presser foot interaction amount adjusting mechanism: when the fixed frame 20 is fixed, the four-bar linkage mechanism B is composed of the presser foot lifting shaft 9, the connecting rod 10, the shaft position screw 11, the connecting swing rod 12, the screw 13, the connecting pin 14, the screw 19, the fixed frame 20 and the outer pressing rod 21. The shaft position screw 11 is used for hinging the connecting rod 10 with the presser foot lifting shaft 9; the screw 13 is used for hinging the connecting rod 10 with the connecting swing rod; the connecting pin 14 is used for hinging the connecting swing rod 12 with the fixed frame 20; the screw 19 is used for fixedly connecting the fixed frame 20 with the outer pressing rod 21; the screw 23 is used for fixedly connecting the outer presser foot 22 with the outer pressing rod 21.

[0006] As shown in Fig. 10, the four-bar linkage mechanism C exists: the short connecting rod 15 is hinged with the connecting swing rod 12, and the short connecting rod 15 is hinged with the inner pressing rod 16; the screw 18 is used for fixedly connecting the inner presser foot 17 with the inner pressing rod 16.

[0007] The realization process of the above-mentioned traditional presser foot interaction amount adjusting mechanism of the sewing machine is that crank rocker mechanism A, four-bar linkage mechanism B and swing block mechanism C are connected in series to realize the up-down movement of the inner presser foot 17 and form the height interaction amount of the inner presser foot 17 and the outer presser foot 22. Specifically, for the crank rocker mechanism A, the upper shaft 1 rotates to drive the eccentric wheel 2 to rotate, and then the presser foot lifting shaft 9 is swung through the connecting rod 4. For the four-bar linkage mechanism B, the presser foot lifting shaft 9 is swung to drive the swing block 12 to swing through the movement transmission of the connecting rod 10. For the swing block mechanism C, the swing block 12 is swung to drive the inner presser foot 17 to move up and down in the needle bar frame in the machine housing through the movement transmission of the short connecting rod 15, and then the up-down movement of the inner presser foot 17 fixedly connected to the inner presser foot 16 is realized.

[0008] When the shaft position screw 5 is loosened, the fixed position of the connecting rod 4 and the interaction amount adjusting crank 6 is adjusted, the swing amplitude of the interaction amount adjusting crank 6 in the crank rocker mechanism A is changed, the swing amplitude of the swing block 12 in the four-bar linkage mechanism B is changed, and then the up-down movement amplitude of the inner presser foot 17 in the swing block mechanism C is changed, and the height difference of the inner presser foot 17 and the outer presser foot 22, that is, the interaction amount, is changed.

[0009] The above-mentioned existing interaction amount adjusting mechanism adjusts the position of the shaft position screw manually to change the interaction amount, and the scheme needs to be stopped to loosen the parts, and there are problems of complicated operation and low efficiency. Practical new type content

[0010] In view of the above technical problems of the existing traditional presser foot interaction amount adjusting mechanism of the sewing machine, the purpose of the present application is to provide a sewing machine presser foot interaction amount adjusting device, which adjusts the relative position of the eccentric wheel connecting rod and the eccentric connecting rod adjusting crank through the interaction amount adjusting mechanism, so as to affect the swing amplitude of the presser foot lifting shaft, and not only can the presser foot be instantaneously adjusted to the maximum interaction amount through the pneumatic telescopic assembly, but also the screw engagement degree of the adjusting rod and the adjusting block can be manually adjusted to adjust the interaction amount of the presser foot.

[0011] In order to achieve the above-mentioned purpose, the sewing machine presser foot interaction amount adjusting device provided by the present application comprises an upper shaft, an interaction amount adjusting crank and a cylindrical pin, the upper shaft is fixed with an eccentric wheel, the eccentric wheel is hinged with a connecting rod, and the interaction amount adjusting crank is fixedly connected with a presser foot lifting shaft.

[0012] It is characterized in that it further comprises an interaction amount adjusting mechanism and a mounting mechanism, the interaction amount adjusting mechanism comprises a pneumatic telescopic assembly, a mounting bracket, an adjusting block, an adjusting rod, the mounting mechanism is fixed on the machine housing of the sewing machine, the mounting bracket is hinged with the mounting mechanism and the presser foot lifting shaft on both sides, and the rotating shaft lines of the mounting bracket, the mounting mechanism and the presser foot lifting shaft are coaxial.

[0013] The pneumatic telescopic assembly is fixed in the mounting bracket, the adjusting block is fixedly connected with the telescopic end of the pneumatic telescopic assembly, the adjusting rod is movably arranged in the mounting bracket, one end of the adjusting rod passes through the adjusting bracket and is threadedly connected with the adjusting block, and the adjusting bracket limits the other end of the adjusting rod, so that the maximum stroke of the movement of the adjusting rod towards the adjusting block can be limited.

[0014] One end of the cylindrical pin sequentially passes through the interactive amount adjusting crank, the connecting rod and the adjusting block and is hingedly connected with the adjusting block, and the cylindrical pin can move on the moving groove in the interactive amount adjusting crank.

[0015] The interactive amount adjusting mechanism is provided with manual and pneumatic adjusting modes.

[0016] When the pneumatic adjusting is performed, the retraction of the telescopic end of the pneumatic telescopic assembly can drive the adjusting block to move, the cylindrical pin moves along with the adjusting block and moves to one end of the moving groove and drives the connecting rod to relatively approach the presser foot lifting shaft, so that the maximum interactive amount of the presser foot can be obtained.

[0017] When the manual adjusting is performed, when the pneumatic telescopic assembly is retracted, the relative position between the adjusting rod and the adjusting block can be adjusted by adjusting the thread engagement degree of the adjusting rod and the adjusting block, the extension amount of the telescopic end of the pneumatic telescopic assembly can be limited when the telescopic end is extended, the position of the cylindrical pin in the moving groove can be adjusted, and the interactive amount of the presser foot can be adjusted.

[0018] Further, the mounting mechanism comprises a mounting seat and a cylinder swing shaft, the mounting seat is fixedly connected to the sewing machine housing, the mounting seat is provided with a shaft hole and a connecting hole, the connecting hole is in communication with the shaft hole, the cylinder swing shaft is arranged in the shaft hole, the cylinder swing shaft is fixed in the shaft hole by means of a fastener passing through the shaft hole of the mounting seat and abutting against the cylinder swing shaft in the shaft hole, and the cylinder swing shaft is hingedly connected to the mounting bracket.

[0019] Further, the mounting bracket is internally provided with a placement cavity capable of accommodating the pneumatic telescopic assembly, the top of the mounting bracket is provided with a plurality of second connecting holes in communication with the placement cavity, the top of the mounting bracket is provided with a through hole capable of accommodating the adjusting rod, and the two sides of the mounting bracket are respectively provided with hinged holes for being hingedly connected to the cylinder swing shaft and the presser foot lifting shaft, and the axes of the two hinged holes are coaxial.

[0020] Further, the pneumatic telescopic assembly comprises a cylinder and a cylinder joint, the top of the cylinder is provided with a third connecting hole corresponding to the plurality of second connecting holes, one side of the cylinder is provided with an interface, the cylinder is placed in the placement cavity, and the cylinder joint is connected to the interface on one side of the cylinder by means of a fastener sequentially passing through the plurality of second connecting holes on the top of the mounting bracket and being connected and fixed to the plurality of third connecting holes on the cylinder in the placement cavity.

[0021] Further, the adjusting block is in a block shape as a whole, a threaded through hole for screwing with the adjusting rod is arranged on the top surface of the adjusting block, an opening for allowing a cylindrical pin to pass through is arranged on one side, a connecting column is arranged on the top, an outer thread is arranged on the surface of the connecting column, the connecting column is threadedly connected with an inner thread of the telescopic end of the air cylinder through the outer thread, and a nut is screwed on the surface of the connecting column and abuts against the telescopic end of the air cylinder.

[0022] Further, the adjusting rod comprises a rod body and a rod cap, the rod cap is fixed on one end of the rod body and the diameter of the rod cap is larger than that of the rod body, the through hole is composed of a first hole section corresponding to the rod cap and a second hole section corresponding to the rod body, and the diameter of the first hole section is larger than that of the second hole section.

[0023] The rod body passes through the first hole section and the second hole section in sequence and is screwed with the threaded through hole of the adjusting block, when the adjusting rod moves towards the adjusting block, the rod cap abuts against the end surface of the first hole section in cooperation, and the movement of the adjusting rod towards the adjusting block can be limited.

[0024] The sewing machine presser foot interactive amount adjusting device provided by the utility model can adjust the interactive amount of the presser foot by screwing the adjusting rod and the adjusting block through the manual adjusting mode or the pneumatic instantaneous adjusting mode.

[0025] The interactive amount adjusting mechanism is provided with manual and pneumatic adjusting modes, manual adjusting and pneumatic instantaneous interactive amount maximization two operation modes are realized, and the problem that the interactive amount of the presser foot needs to be adjusted when thick material climbs is better solved. BRIEF DESCRIPTION OF DRAWINGS

[0026] The utility model will be further explained in combination with the drawings and specific embodiments.

[0027] Figure 1 It is an exploded structure schematic view of the presser foot interactive amount adjusting mechanism of the traditional sewing machine.

[0028] Figure 2 It is a first perspective view schematic view of the sewing machine presser foot interactive amount adjusting device provided by the utility model installed on the sewing machine shell.

[0029] Figure 3 It is a second perspective view schematic view of the sewing machine presser foot interactive amount adjusting device provided by the utility model installed on the sewing machine shell.

[0030] Figure 4 It is an overall exploded structure schematic view of the sewing machine presser foot interactive amount adjusting device provided by the utility model.

[0031] Figure 5 The structure schematic diagram of the crank rocker mechanism in the sewing machine presser foot interaction amount adjusting device is provided in the utility model.

[0032] Figure 6 The structure schematic diagram of the mounting mechanism in the sewing machine presser foot interaction amount adjusting device is provided in the utility model.

[0033] Figure 7 The structure schematic diagram of the interaction amount adjusting mechanism in the sewing machine presser foot interaction amount adjusting device is provided in the utility model.

[0034] Illustration:

[0035] The crank rocker mechanism 100, the interaction amount adjusting mechanism 200, the mounting mechanism 300, the sewing machine housing 400.

[0036] The close screw 101, the clamping spring 102, the inner hexagonal cylindrical head screw 103, the screw 104, the second close screw 105, the second screw 106, the nut 107.

[0037] The upper shaft 110, the interaction amount adjusting crank 120, the cylindrical pin 130, the eccentric wheel 140, the connecting rod 150, the presser foot lifting shaft 160, the pneumatic telescopic assembly 210, the air cylinder 211, the air cylinder joint 212, the third connecting hole 213, the mounting bracket 220, the second connecting hole 222, the through hole 223, the first hole section 223a, the second hole section 223b, the hinged hole 224, the adjusting block 230, the threaded through hole 231, the opening 232, the connecting column 233, the adjusting rod 240, the rod body 241, the rod cap 242.

[0038] The mounting seat 310, the shaft hole 311, the connecting hole 312, the air cylinder swing shaft 320. Specific implementation

[0039] In order to make the technical means, the creation features, the purposes and the effects achieved by the utility model easy to understand, the utility model is further described below in combination with specific drawings.

[0040] Referring to Figures 2-7 The structure schematic diagram of the sewing machine presser foot interaction amount adjusting device is provided in the utility model.

[0041] According to the drawings, the sewing machine presser foot interaction amount adjusting device provided by the utility model comprises the crank rocker mechanism 100, the interaction amount adjusting mechanism 200 and the mounting mechanism 300.

[0042] The crank rocker mechanism 100 is movably connected with the interactive amount adjusting mechanism 200, the interactive amount adjusting mechanism 200 is fixed to the sewing machine frame through the mounting mechanism 300, and the interactive amount adjusting mechanism 200 is movably connected with the mounting mechanism 300, the interactive amount adjusting mechanism 200 can adjust the swing amplitude of the crank rocker mechanism 100, so as to adjust the moving amount of the inner presser foot connected with the crank rocker mechanism 100.

[0043] The interactive amount adjusting mechanism 200 in the scheme can adjust the inner presser foot to the maximum presser foot interactive amount by using the pneumatic instantaneous, and can also adjust the interactive amount of the presser foot by using the manual mode.

[0044] Further, the crank rocker mechanism 100 specifically comprises an upper shaft 110, an interactive amount adjusting crank 120, a cylindrical pin 130, the upper shaft 110 is fixed with an eccentric wheel 140, the eccentric wheel 140 is hinged with a connecting rod 150, the interactive amount adjusting crank 120 is fixedly connected with a presser foot lifting shaft 160;

[0045] The interactive amount adjusting mechanism 200 comprises a pneumatic telescopic assembly 210, a mounting bracket 220, an adjusting block 230, an adjusting rod 240, the mounting mechanism 300 is fixed on the sewing machine shell 400, the mounting bracket 220 is hinged with the mounting mechanism 300 and the presser foot lifting shaft 160 on both sides, and the mounting bracket 220 is coaxial with the rotating shaft lines of the mounting mechanism 300 and the presser foot lifting shaft 160 on both sides;

[0046] The pneumatic telescopic assembly 210 is fixed in the mounting bracket 220, the adjusting block 230 is fixedly connected with the telescopic end of the pneumatic telescopic assembly 210, the adjusting rod 240 is movably arranged in the mounting bracket 220, the first end passes through the adjusting bracket 220 and is threadedly connected with the adjusting block 230, the adjusting bracket 220 limits the second end of the adjusting rod 240, and can limit the maximum stroke of the movement of the adjusting rod 240 towards the adjusting block 230;

[0047] One end of the cylindrical pin 130 passes through the interactive amount adjusting crank 120, the connecting rod 150 and the adjusting block 230 in sequence and is hinged with the adjusting block 230, and the cylindrical pin 130 can move on the moving groove in the interactive amount adjusting crank 120;

[0048] The interactive amount adjusting mechanism 200 is provided with two adjusting modes of manual and pneumatic,

[0049] When the pneumatic adjustment is performed, the retraction of the telescopic end of the pneumatic telescopic assembly 210 can drive the adjusting block 230 to move, the cylindrical pin 130 moves along with the adjusting block 230 and moves to one end of the moving groove and drives the connecting rod 150 to relatively approach the presser foot lifting shaft 160, so that the presser foot interactive amount is maximum,

[0050] When the pneumatic telescopic assembly 210 is retracted, the relative position between the adjusting rod 240 and the adjusting block 230 can be adjusted by adjusting the degree of engagement of the adjusting rod 240 and the adjusting block 230, so that when the telescopic end of the pneumatic telescopic assembly 210 extends outward, the second end of the adjusting rod 240 abuts against the mounting bracket 220, the adjusting rod 240 is prevented from continuing to move, and the extension amount of the telescopic end of the pneumatic telescopic assembly 210 can be limited, thereby adjusting the interaction amount of the presser foot.

[0051] Specifically, as Figure 5 , the upper shaft 110 in the present example is preferably fixedly connected with the eccentric wheel 140 through the set screw 101, one end of the connecting rod 150 is preferably sleeved on the eccentric wheel 140 and limited in axial movement by using a clasp spring, so that the two are hinged, one end of the cylindrical pin 130 is sequentially threaded through the interaction amount adjusting crank 120, the other end of the connecting rod 150 and the adjusting block 230, and the cylindrical pin 130 is preferably hinged with the adjusting block 230 by sleeving the clasp spring 102 on the end of the cylindrical pin 130; the interaction amount adjusting crank 120 is preferably fixedly connected with the presser foot lifting shaft 160 through the inner hexagonal cylindrical head screw 103.

[0052] Further, as Figure 6 , the mounting mechanism 300 includes a mounting seat 310 and a cylinder swing shaft 320, the mounting seat 310 is preferably fixedly connected on the sewing machine housing 400 through the screw 104, the mounting seat 310 is provided with a shaft hole 311, and the mounting seat 310 is provided with a connecting hole 312 which is in communication with the shaft hole 311, the cylinder swing shaft 320 is threaded in the shaft hole 311 and is preferably fixed in the shaft hole 311 of the mounting seat 310 by the second set screw 105 which is threaded through the shaft hole 311 of the mounting seat 310 and abuts against the cylinder swing shaft 320 in the shaft hole 311, and the cylinder swing shaft 320 is hinged with the mounting bracket 220.

[0053] The mounting mechanism 300 with such a structure cooperates with the interaction amount adjusting mechanism 200, and the interaction amount adjusting mechanism 200 is thereby fixed on the sewing machine housing 400 through the mounting mechanism 300.

[0054] As Figure 7 , the mounting bracket 220 in the interaction amount adjusting mechanism 200 is specifically provided with a placement cavity in which the pneumatic telescopic assembly 210 can be placed, the top of the mounting bracket 220 is provided with a plurality of second connecting holes 222 which are in communication with the placement cavity 221, the top of the mounting bracket 220 is provided with a through hole 223 in which the adjusting rod 240 can be threaded, and the two sides of the mounting bracket 220 are respectively provided with hinging holes 224 which are used for hinging with the cylinder swing shaft 320 and the presser foot lifting shaft 160, and the axes of the two hinging holes 224 are coaxial.

[0055] In this structure, the presser foot lifting shaft 160 is hinged with the hinge hole 224 on one side of the mounting bracket 220, and the cylinder swing shaft 320 is hinged with the hinge hole 224 on the other side of the cylinder mounting bracket. Since the two hinge holes 224 are coaxial, the presser foot lifting shaft 160 is coaxial with the cylinder swing shaft 320.

[0056] The pneumatic telescopic assembly 210 comprises a cylinder 211, a cylinder joint 212, the top of the cylinder 211 is provided with a third connecting hole 213 corresponding to a plurality of second connecting holes 222, one side of the cylinder 211 is provided with an interface, and the cylinder 211 is arranged in the arrangement cavity. Preferably, the second screw 106 is sequentially threaded through the plurality of second connecting holes 222 on the top of the mounting bracket 220 and is connected and fixed with the plurality of third connecting holes 213 on the cylinder 211 in the arrangement cavity 221, and the cylinder joint 212 is connected with the interface on one side of the cylinder 211.

[0057] Further, the adjusting block 230 is in the shape of a block as a whole, the top surface of the adjusting block 230 is provided with a threaded hole 231 for screwing with the adjusting rod 240, one side is provided with an opening 232 capable of allowing the cylindrical pin 130 to penetrate, the top is provided with a connecting column 233, the surface of the connecting column 233 is provided with external threads, the connecting column 233 is threadedly connected with the internal threads of the telescopic end of the cylinder 211 through the external threads, and the surface of the connecting column 233 is screwed with the nut 107, and the nut 107 abuts against the telescopic end of the cylinder 211 to enhance the connection.

[0058] The adjusting rod 240 comprises a rod body 241 and a rod cap 242, the rod cap 242 is fixed at one end of the rod body 241 and the diameter of the rod cap 242 is greater than that of the rod body 241. In cooperation therewith, the through hole 223 is composed of a first hole section 223a corresponding to the rod cap 242 and a second hole section 223b corresponding to the rod body 241, the diameter of the first hole section 223a is greater than that of the second hole section 223b,

[0059] One end of the rod body 241 is sequentially threaded through the first hole section 223a, the second hole section 223b and the threaded hole 231 of the adjusting block 230, when the adjusting rod 240 moves towards the adjusting block 230, the rod cap 242 abuts against the end surface of the first hole section 223a in cooperation, which can limit the movement of the adjusting rod 240 towards the adjusting block 230.

[0060] In actual application, the adjusting rod 240 is manually rotated to adjust the threaded cooperation between the adjusting rod 240 and the adjusting block 230. When the cylinder is ejected, since the rod cap 242 of the adjusting rod 240 abuts against the end surface of the first hole section 223a in the mounting bracket 220, the telescopic end of the cylinder 211 is prevented from continuing to be ejected outward. Thus, the extension amount of the telescopic end of the cylinder is changed, so as to finally achieve the purpose of adjusting the interaction amount.

[0061] The sewing machine presser foot interaction amount adjusting device based on the above scheme is described below to illustrate its working process in specific application, and the specific working process is as follows:

[0062] First, the upper shaft 110 rotates to drive the eccentric wheel 140 to rotate; the eccentric wheel 140 drives the interaction amount adjusting crank 120 to swing through the connecting rod 150 and the cylindrical pin 130, thereby driving the presser foot lifting shaft 160 to swing; since the presser foot lifting shaft 160 is coaxial with the cylinder swing shaft 320, the mounting bracket 220 swings synchronously with the interaction amount adjusting crank 120.

[0063] When the swing amplitude of the interaction amount adjusting crank 120 needs to be maximum (the moving amount of the inner presser foot is maximum), the cylinder 211 retracts to the minimum, and the retraction of the cylinder 211 can drive the adjusting block 230 to move upwards, the adjusting block 230 drives the cylindrical pin 130 connected thereto to move, the cylindrical pin 130 moves in the interaction amount adjusting crank 120 and drives the connecting rod 150 to move, the connecting rod 150 moves towards the presser foot lifting shaft 160 to relatively close, at this time, the swing amplitude of the interaction amount adjusting crank 120 and the presser foot lifting shaft 160 is maximum, and since the presser foot lifting shaft 160 is connected with the inner presser foot, the moving amount of the inner presser foot is maximum.

[0064] When the swing amplitude (the moving amount of the inner presser foot) of the interaction amount adjusting crank 120 needs to be manually adjusted, it is only necessary to rotate the adjusting rod 240 to make the adjusting rod 240 threadedly cooperate with the adjusting block 230, the rod body 241 of the adjusting rod 240 moves in the mounting bracket 220 towards the adjusting rod 240, and after adjustment, at this time, the retraction end of the cylinder 211 is pushed outwards and drives the adjusting rod 240 to continue to move towards the adjusting block 230 until the rod cap 242 of the adjusting rod 240 abuts against the mounting bracket 220, thereby preventing the retraction end of the cylinder 211 from continuing to extend outwards, at this time, the position of the cylindrical pin 130 in the interaction amount adjusting crank 120 is ensured, the swing amplitude of the interaction amount adjusting crank 120 is ensured, and the presser foot interaction amount is ensured.

[0065] The basic principle, main features and advantages of the utility model are shown and described above. It should be understood by those skilled in the art that the utility model is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principle of the utility model, and various changes and improvements can be made to the utility model without departing from the spirit and scope of the utility model, and these changes and improvements all fall within the scope of the utility model claimed. The protection scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A sewing machine presser foot interaction amount adjustment device, comprising an upper shaft, an interaction amount adjustment crank, and a cylindrical pin, wherein an eccentric wheel is fixedly mounted on the upper shaft, the eccentric wheel is hinged to a connecting rod, and a presser foot lifting shaft is fixedly connected to the interaction amount adjustment crank; Its features are, It also includes an interaction amount adjustment mechanism and an installation mechanism. The interaction amount adjustment mechanism includes a pneumatic telescopic component, a mounting bracket, an adjustment block, and an adjustment rod. The installation mechanism is fixed on the sewing machine housing. The two sides of the mounting bracket are respectively hinged to the installation mechanism and the presser foot lifting shaft. The two sides of the mounting bracket are coaxial with the rotation axis of the installation mechanism and the presser lifting shaft. The pneumatic telescopic assembly is fixed in the mounting bracket. The adjusting block is fixedly connected to the telescopic end of the pneumatic telescopic assembly. The adjusting rod is movably inserted into the mounting bracket. One end passes through the adjusting bracket and is threadedly connected to the adjusting block. The adjusting bracket limits the other end of the adjusting rod, thereby limiting the maximum travel of the adjusting rod towards the adjusting block. One end of the cylindrical pin passes through the interactive amount adjustment crank, the connecting rod and the adjustment block in sequence and is hinged to the adjustment block. The cylindrical pin can move on the moving groove in the interactive amount adjustment crank. The interaction quantity adjustment mechanism has both manual and pneumatic adjustment modes. When pneumatically adjusted, the retraction of the pneumatic telescopic assembly's telescopic end moves the adjusting block. The cylindrical pin follows the adjusting block and moves to one end of the moving slot, causing the connecting rod to move closer to the pressure foot lifting shaft, thus maximizing the pressure foot interaction. When manually adjusted, the relative position between the adjusting rod and the adjusting block can be adjusted by adjusting the thread engagement between the adjusting rod and the adjusting block when the pneumatic telescopic assembly retracts. It can also limit the extension amount when the telescopic end of the pneumatic telescopic assembly extends, thereby adjusting the position of the cylindrical pin in the moving groove and thus adjusting the interaction amount of the pressure foot.

2. The sewing machine presser foot interaction adjustment device according to claim 1, characterized in that, The mounting mechanism includes a mounting base and a cylinder swing shaft. The mounting base is fixedly connected to the sewing machine housing. The mounting base has a shaft hole and a connecting hole. The connecting hole communicates with the shaft hole. The cylinder swing shaft passes through the shaft hole. Fasteners pass through the shaft hole on the mounting base and abut against the cylinder swing shaft in the shaft hole to fix the cylinder swing shaft in the shaft hole. The cylinder swing shaft is hinged to the mounting bracket.

3. The sewing machine presser foot interaction adjustment device according to claim 1, characterized in that, The mounting bracket has an internal cavity for accommodating the pneumatic telescopic component. The top of the mounting bracket has several second connecting holes communicating with the cavity. The top of the mounting bracket has a through hole for accommodating the adjusting rod. The two sides of the mounting bracket have hinge holes for hinged to the cylinder swing shaft and the pressure foot lifting shaft, respectively. The axes of the two hinge holes are coaxial.

4. The sewing machine presser foot interaction adjustment device according to claim 3, characterized in that, The pneumatic telescopic assembly includes a cylinder and a cylinder connector. The top of the cylinder is provided with a third connecting hole corresponding to a plurality of second connecting holes. An interface is provided on one side of the cylinder. The cylinder is placed in a mounting cavity. Fasteners are used to sequentially pass through a plurality of second connecting holes on the top of the mounting bracket and connect and fix it to a plurality of third connecting holes on the cylinder in the mounting cavity. The cylinder connector is connected to the interface on one side of the cylinder.

5. The sewing machine presser foot interaction adjustment device according to claim 4, characterized in that, The adjusting block is block-shaped in general. The top surface of the adjusting block is provided with a threaded through hole for screwing the adjusting rod. One side is provided with an opening that can accommodate a cylindrical pin to pass through. The top is provided with a connecting post. The surface of the connecting post is provided with external threads. The connecting post is threadedly connected to the internal threads of the cylinder's telescopic end through the external threads. A nut is screwed onto the surface of the connecting post, and the nut abuts against the telescopic end of the cylinder.

6. The sewing machine presser foot interaction adjustment device according to claim 5, characterized in that, The adjusting rod includes a rod body and a rod cap. The rod cap is fixed to one end of the rod body and the diameter of the rod cap is larger than the diameter of the rod body. The through hole is composed of a first hole segment corresponding to the rod cap and a second hole segment corresponding to the rod body. The diameter of the first hole segment is larger than the diameter of the second hole segment. One end of the rod passes through the first hole section in sequence, and the second hole section is screwed to the threaded through hole of the adjusting block. When the adjusting rod moves toward the adjusting block, the rod cap abuts against the end face of the first hole section, which can limit the movement of the adjusting rod toward the adjusting block.

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