Presser foot assembly and sewing machine

Abstract

The utility model relates to a presser foot assembly and a sewing machine, the presser foot assembly is matched with a bird nest prevention assembly, and the presser foot assembly comprises a driving structure; the transmission structure is matched with the output end of the driving structure; and the presser foot structure is matched with the transmission structure, so that the presser foot structure has a position close to the machine table or a position far away from the machine table. According to the technical scheme, the problem that in the prior art, when the presser foot position of a sewing machine is adjusted, the requirement for preventing bird nests cannot be met is effectively solved.

Description

Technical Field

[0001] The present application relates to the technical field of sewing machines, and in particular to a presser foot assembly and a sewing machine. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing materials are interwoven or sewn together. Sewing machines include sewing machines, stitching machines, embroidery machines, and quilting machines.

[0003] The sewing work of the sewing machine is mainly completed by the cooperation of the machine needle and the presser foot. In some prior arts, the presser foot assembly manually lifts the presser foot to adjust the distance between the presser foot and the machine table, such as when switching between thick and thin materials. In some cases, according to the needs of the sewing machine, the presser foot needs to be lifted at any time to cooperate with other components. For example, when some sewing machines are preventing bird nests, the presser foot needs to be lifted to meet the needs of preventing bird nests. Manually adjusting the distance between the presser foot and the machine table cannot meet the needs of preventing bird nests. Utility Model Content

[0004] The present application provides a presser foot assembly and a sewing machine to solve the problem that the sewing machine in the prior art cannot meet the need of preventing bird nests when adjusting the position of the presser foot.

[0005] According to a presser foot assembly provided by the present application, the presser foot assembly cooperates with the anti-bird nest assembly, and the presser foot assembly includes: a driving structure; a transmission structure, the transmission structure cooperates with the output end of the driving structure; and a presser foot structure, the presser foot structure cooperates with the transmission structure so that the presser foot structure has a position close to the machine or a position far away from the machine.

[0006] Furthermore, the transmission structure includes a gear and a rack, the gear is connected to the output end of the driving structure, the gear matches the rack, and the rack is connected to the presser foot structure.

[0007] Furthermore, the transmission structure also includes a rack slideway, the extension direction of the rack slideway is consistent with the extension direction of the rack, and the rack is movably matched with the rack slideway.

[0008] Furthermore, the transmission structure also includes a rack protection cylinder, the rack is movably arranged in the rack protection cylinder, and the inner wall of the rack protection cylinder forms a rack slideway.

[0009] Furthermore, the transmission structure also includes an elastic member, which is arranged between the sewing machine body and the presser foot structure.

[0010] Furthermore, the presser foot structure includes a presser foot, a presser foot connecting rod and a support block, the first end of the presser foot connecting rod is connected to the presser foot, the second end of the presser foot connecting rod is connected to the support block, and the rack and the elastic member are both connected to the support block.

[0011] Furthermore, the elastic member is a spring, and a central axis of the spring coincides with an extension line of a central axis of the connecting rod.

[0012] Further, the driving structure includes a driving motor, the transmission structure includes a threaded rod, a threaded barrel and a linkage seat, the driving motor is connected to the first end of the threaded rod, the second end of the threaded rod is rotatably connected to the linkage seat, the threaded rod cooperates with the threaded barrel, the linkage seat is at least partially located in the threaded barrel, and the linkage seat is non-circular and compatible with the threaded barrel; or the driving structure is a cylinder structure; or the driving structure is a hydraulic structure.

[0013] Furthermore, the presser foot assembly also includes a distance detection structure, and the distance detection structure is arranged on the transmission structure and / or the presser foot structure.

[0014] According to another aspect of the present application, a sewing machine is also provided, which includes a sewing machine body, a presser foot assembly, an anti-bird's nest assembly and a control assembly. The control assembly is electrically connected to the sewing machine body, the anti-bird's nest assembly and the presser foot assembly, and the presser foot assembly is the above-mentioned presser foot assembly.

[0015] By applying the technical solution of the present application, the driving structure drives the presser foot structure to a position close to or far away from the machine platform through the transmission structure. Such a structure is more flexible and more efficient. For example, when the anti-bird's nest component is drawing thread, the driving structure drives the presser foot structure to a position far away from the machine platform through the transmission structure, which facilitates the drawing of thread of the anti-bird's nest component. For another example, when sewing materials of different thicknesses, it is necessary to change the position between the presser foot structure and the machine platform. The technical solution of the present application effectively solves the problem in the prior art that the sewing machine cannot meet the need for preventing bird's nests when adjusting the presser foot position. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 A three-dimensional structural schematic diagram of the presser foot assembly of the first embodiment of the present application is shown.

[0019] The above drawings include the following reference numerals:

[0020] 10. Driving structure; 20. Transmission structure; 21. Gear; 22. Rack; 23. Rack protection tube; 24. Elastic member; 30. Presser foot structure; 31. Presser foot; 32. Presser foot connecting rod; 33. Support block; 100. Anti-bird nest assembly. DETAILED DESCRIPTION

[0021] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0022] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0023] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used herein to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" may include both "above" and "below". The device may also be positioned in other different ways, rotated 90 degrees or in other orientations, and the spatially relative descriptions used herein are interpreted accordingly.

[0024] like Figure 1 As shown, the presser foot assembly of the first embodiment cooperates with the anti-bird nest assembly 100, and the presser foot assembly includes: a driving structure 10, a transmission structure 20 and a presser foot structure 30. The transmission structure 20 cooperates with the output end of the driving structure 10. The presser foot structure 30 cooperates with the transmission structure 20 so that the presser foot structure 30 has a position close to the machine or a position far away from the machine.

[0025] By applying the technical solution of this embodiment, the driving structure 10 drives the presser foot structure 30 to a position close to or far away from the machine through the transmission structure 20. Such a structure is more flexible and more efficient. For example, when the anti-bird nest assembly 100 is drawing the thread, the driving structure 10 drives the presser foot structure 30 to a position far away from the machine through the transmission structure 20, which facilitates the drawing of the anti-bird nest assembly. For another example, when sewing materials of different thicknesses, it is necessary to change the position between the presser foot structure 30 and the machine. The technical solution of this embodiment effectively solves the problem that the sewing machine in the prior art cannot meet the need for anti-bird nest when adjusting the presser foot position.

[0026] like Figure 1 As shown, in the technical solution of the first embodiment, the transmission structure 20 includes a gear 21 and a rack 22, the gear 21 is connected to the output end of the driving structure 10, the gear 21 cooperates with the rack 22, and the rack 22 is connected to the presser foot structure 30. Through the transmission structure of the gear 21 and the rack 22, the movement efficiency of the transmission structure 20 and the stability of the transmission can be ensured, and the stop position of the presser foot structure 30 can be ensured to be relatively continuous.

[0027] like Figure 1 As shown, in the technical solution of the first embodiment, the transmission structure 20 also includes a rack slideway, the extension direction of the rack slideway is consistent with the extension direction of the rack 22, and the rack 22 is movably matched with the rack slideway. The setting of the rack slideway ensures that the rack 22 moves smoothly on the one hand, and on the other hand, the rack slideway forms a certain limit on the rack. The extension direction of the rack slideway is consistent with the extension direction of the rack 22.

[0028] like Figure 1 As shown, in the technical solution of embodiment 1, the transmission structure 20 also includes a rack protection cylinder 23, and the rack 22 is movably arranged in the rack protection cylinder 23, and the inner wall of the rack protection cylinder 23 forms a rack slideway. The arrangement of the rack protection cylinder 23 makes the structure compact. In addition, the rack 22 is protected by the rack protection cylinder 23, ensuring that the rack is not easily disturbed by external contaminants. It should be noted that the inner wall of the rack protection cylinder 23 can be provided with angles that match the four corners of the rack 22, the outer wall of the rack protection cylinder 23 is connected to the sewing machine body, and the rack protection cylinder 23 leaks out of the side of the rack 22 close to the needle, and the gear 21 cooperates with the leaked part.

[0029] like Figure 1 As shown, in the technical solution of the first embodiment, the transmission structure 20 further includes an elastic member 24, which is arranged between the sewing machine body and the presser foot structure 30. The setting of the elastic member 24 plays a role of buffering and shock absorption on the one hand, and can provide a certain preload force on the other hand. It should be noted that the elastic member 24 can be one or more. Figure 1There is only one elastic member 24 shown in the figure. When there are multiple elastic members 24, the multiple elastic members 24 can be evenly distributed on the upper surface of the support block 33 (the side away from the presser foot 31), so that the force on the presser foot structure 30 is more stable and more uniform.

[0030] like Figure 1 As shown, in the technical scheme of embodiment 1, the presser foot structure 30 includes a presser foot 31, a presser foot connecting rod 32 and a support block 33, the first end of the presser foot connecting rod 32 is connected to the presser foot 31, the second end of the presser foot connecting rod 32 is connected to the support block 33, and the rack 22 and the elastic member 24 are both connected to the support block 33. The above structure is compactly arranged and easy to operate. The arrangement of the presser foot connecting rod 32 allows the distance between the transmission structure 20 and the presser foot 31 to be adjusted according to the internal space of the sewing machine body. The arrangement of the support block 33 ensures that the force on the presser foot 31 is more uniform.

[0031] like Figure 1 As shown, in the technical solution of the first embodiment, the elastic member 24 is a spring, and the central axis of the spring coincides with the extension line of the central axis of the connecting rod. This ensures that the force of the spring on the presser foot connecting rod 32 is more uniform and stable, and the elastic force passes through the central axis of the presser foot connecting rod 32. It should be noted that the inner wall of the sewing machine housing and the upper surface of the support block 33 are both provided with limiting bosses, and the two ends of the spring are respectively matched with the two limiting bosses, that is, the two limiting bosses are respectively deep into the interior of the two ends of the spring.

[0032] In the technical solution of embodiment 1 (not shown in the figure), the presser foot assembly also includes a distance detection structure, and the distance detection structure is arranged on the presser foot structure 30. The distance detection structure includes a transmitter and a receiver, and the transmitter and the receiver are both arranged on the presser foot structure 30. The distance between the presser foot 31 and the machine table can be known by measuring the signal emitted by the transmitter. It should be noted that the transmitter can be a radar transmitter or a light source transmitter, etc. Detection and analysis are performed through the control component of the sewing machine, and the distance detection structure is electrically connected to the control component, which can be a wired connection or a wireless connection. The sewing machine of this embodiment can automatically adjust the required height positions of the two functions when sewing thick and thin materials and using the anti-bird nest component.

[0033] The technical solution of Example 2 differs from that of Example 1 in that the drive structure 10 includes a drive motor, the transmission structure 20 includes a threaded rod, a threaded barrel and a linkage seat, the drive motor is connected to the first end of the threaded rod, the second end of the threaded rod is rotatably connected to the linkage seat, the threaded rod cooperates with the threaded barrel, the linkage seat is at least partially located in the threaded barrel, and the linkage seat is non-circular and adapted to the threaded barrel.

[0034] The technical solution of the third embodiment is different from that of the first embodiment in that the driving structure 10 is a cylinder structure, and the central axis of the cylinder structure is parallel to the central axis of the needle.

[0035] The technical solution of the fourth embodiment is different from that of the first embodiment in that the driving structure 10 is a hydraulic structure, and the central axis of the hydraulic structure is parallel to the central axis of the needle.

[0036] The technical solution of the fifth embodiment differs from that of the first embodiment in that the driving structure 10 is an electric push rod structure.

[0037] The difference between the technical solution of the sixth embodiment and the technical solution of the first embodiment is that the distance detection structure includes a pressure sensor, which is arranged between the elastic member 24 and the support block 33. By measuring the pressure of the elastic member 24, it can be converted into the moving distance of the presser foot 31, F=KX, F is the elastic force on the elastic member; K is the elastic modulus of the elastic member 24; X is the moving distance of the elastic member. Transmission structure 20

[0038] The difference between the technical solution of the seventh embodiment and the technical solution of the first embodiment is that the distance detection structure includes both the transmitter and the receiver of the first embodiment and the pressure sensor of the sixth embodiment, so that the two measurements are performed simultaneously to ensure better measurement accuracy.

[0039] The difference between the technical solution of Example 8 and the technical solution of Example 1 is that the transmission structure 20 also includes a stabilizing sleeve, the outer wall of the rack protection cylinder 23 is adapted to the inner wall of the stabilizing sleeve, the stabilizing sleeve is connected to the sewing machine by fasteners or by other means (such as welding), the rack protection cylinder 23 is movably arranged in the stabilizing sleeve, and the rack 22 is connected to the rack protection cylinder 23 by welding (connection by fasteners is also possible).

[0040] The present application also provides a sewing machine, which includes a sewing machine body, a presser foot assembly, an anti-bird nest assembly 100 and a control assembly. The control assembly is electrically connected to the sewing machine body, the anti-bird nest assembly 100 and the presser foot assembly, and the presser foot assembly is the above-mentioned presser foot assembly.

[0041] The anti-bird nest assembly 100 includes a thread drawing drive unit and a thread drawing unit, wherein the thread drawing drive unit is fixed to the sewing machine body, and the thread drawing unit is connected to the output end of the thread drawing drive unit to drive the thread drawing unit to move. The above structure is compact and easy to operate. It should be noted that the anti-bird nest assembly 100 is electrically connected to the control assembly, which greatly improves the degree of automation and the accuracy of thread drawing.

[0042] The thread-drawing driving unit includes a thread-drawing driving motor, a thread-drawing gear, a thread-drawing rack and a limit seat. The thread-drawing driving motor and the limit seat are installed on the main body of the sewing machine. The thread-drawing gear is installed at the output end of the thread-drawing driving motor. The thread-drawing rack can be installed in the limit seat movably along the axial direction of the needle. The thread-drawing unit is installed on the thread-drawing rack, and the sewing thread matching part of the thread-drawing unit is located outside the main body of the sewing machine. The setting of the limit seat makes the movement of the thread-drawing rack more stable. The cooperation of the thread-drawing gear and the thread-drawing rack can meet the thread-drawing speed of the thread-drawing structure and the thread-drawing accuracy. The axial direction of the thread-drawing rack is the same as the axial direction of the needle. The thread-drawing unit and the thread-drawing rack are an integrated structure, or they are detachably connected by fasteners such as screws, or they are welded. The thread-drawing driving motor, the thread-drawing gear and the limit seat are all installed in the sewing machine housing, and the thread-drawing rack is also installed in the sewing machine housing. As the thread-drawing rack moves, part of it can be located outside the sewing machine housing. The wire drawing part includes a wire drawing arm, a first end of the wire drawing arm is connected to the wire drawing rack, a second end of the wire drawing arm is provided with a through hole (wire drawing hole), and the through hole can be one or more. The wire drawing arm can be one or more, and when there are multiple wire drawing arms, the multiple wire drawing arms are arranged at intervals along the extension direction of the wire drawing rack.

[0043] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0044] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0045] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A presser foot assembly, characterized in that: The presser foot assembly cooperates with the bird nest prevention assembly (100), and the presser foot assembly comprises: A driving structure (10); A transmission structure (20), the transmission structure (20) cooperates with an output end of the drive structure (10); A presser foot structure (30), wherein the presser foot structure (30) cooperates with the transmission structure (20) so that the presser foot structure (30) has a position close to the machine platform or a position far away from the machine platform.

2. The presser foot assembly according to claim 1, characterized in that: The transmission structure (20) comprises a gear (21) and a rack (22); the gear (21) is connected to the output end of the driving structure (10); the gear (21) cooperates with the rack (22); and the rack (22) is connected to the presser foot structure (30).

3. The presser foot assembly according to claim 2, characterized in that: The transmission structure (20) also includes a rack slideway, the extension direction of the rack slideway is consistent with the extension direction of the rack (22), and the rack (22) is movably matched with the rack slideway.

4. The presser foot assembly according to claim 3, characterized in that: The transmission structure (20) further comprises a rack protection cylinder (23), the rack (22) being movably arranged in the rack protection cylinder (23), and the inner wall of the rack protection cylinder (23) forming the rack slideway.

5. The presser foot assembly according to claim 4, characterized in that: The transmission structure (20) further comprises an elastic member (24), wherein the elastic member (24) is arranged between the sewing machine body and the presser foot structure (30).

6. The presser foot assembly according to claim 5, characterized in that: The presser foot structure (30) comprises a presser foot (31), a presser foot connecting rod (32) and a support block (33); the first end of the presser foot connecting rod (32) is connected to the presser foot (31); the second end of the presser foot connecting rod (32) is connected to the support block (33); and the rack (22) and the elastic member (24) are both connected to the support block (33).

7. The presser foot assembly according to claim 6, characterized in that: The elastic member (24) is a spring, and the central axis of the spring coincides with the extension line of the central axis of the presser foot connecting rod (32).

8. The presser foot assembly according to claim 1, characterized in that: The drive structure (10) comprises a drive motor, and the transmission structure (20) comprises a threaded rod, a threaded barrel and a linkage seat, wherein the drive motor is connected to a first end of the threaded rod, and a second end of the threaded rod is rotatably connected to the linkage seat, the threaded rod cooperates with the threaded barrel, the linkage seat is at least partially located in the threaded barrel, and the linkage seat is non-circular and compatible with the threaded barrel; or the drive structure (10) is a cylinder structure; or the drive structure (10) is a hydraulic structure.

9. The presser foot assembly according to any one of claims 1 to 8, characterized in that: The presser foot assembly further comprises a distance detection structure, and the distance detection structure is arranged on the transmission structure (20) and / or the presser foot structure (30).

10. A sewing machine, characterized in that: The sewing machine comprises a sewing machine body, a presser foot assembly, an anti-bird nest assembly (100) and a control assembly, wherein the control assembly is electrically connected to the sewing machine body, the anti-bird nest assembly (100) and the presser foot assembly, and the presser foot assembly is the presser foot assembly described in any one of claims 1 to 9.

Images