An encryption sewing device and sewing machine

Abstract

The utility model belongs to sewing equipment technical field, especially point to a kind of encryption sewing device and sewing machine;One end of the main control lever main shaft of stitch regulating mechanism protrudes shell lower section, and is connected with the one end of main feed tooth adjusting lever, main feed tooth scale plate is provided on shell lower section, first arc-shaped hole with the main control lever main shaft axis as center is provided on main feed tooth scale plate, connecting piece is worn in first arc-shaped hole and respectively connects the other end of main feed tooth adjusting lever and the one end of transmission plate, the other end of transmission plate is connected with the output end of driving part, can make main feed tooth adjusting lever rotate and adjust the stitch of cloth feed tooth under the action of driving part, realize the switching between tight seam and the stitch required by work;The utility model can quickly and reliably switch without stopping between the stitch required by work switching and encryption sewing stitch, can realize automatic encryption sewing when starting sewing and sewing end, significantly improve sewing efficiency and sewing quality.

Description

Technical Field

[0001] This utility model belongs to the field of sewing equipment technology, and specifically refers to an encrypted sewing device and sewing machine. Background Technology

[0002] In existing sewing machines, the stitch length adjustment mechanism is typically preset and fixed before sewing begins, and cannot be dynamically adjusted during the initial stitching stage and at the end of the sewing process. This inherent defect means that the bottom thread end at the start of the sewing cannot form an effective self-locking stitch structure by changing the stitch length, and the stability of the thread loop formed by relying solely on a single stitch length is insufficient. During subsequent cutting, finishing, or wearing, the starting thread end is easily loosened by external force, which not only affects the appearance of the sewn product but also significantly reduces the strength and durability of the seam.

[0003] Chinese utility model patent (publication number CN 223003127U, publication date 2025.06.20) discloses a sewing machine with adjustable stitch length, which is used to adjust the stitch length to achieve close stitching or normal sewing. However, this structure requires manual operation after the machine is stopped, and it is impossible to achieve real-time dynamic adjustment of stitch length during the sewing process. Summary of the Invention

[0004] The purpose of this invention is to provide an encrypted sewing device and sewing machine that can dynamically adjust the stitch length in real time during the sewing process to switch between normal sewing and encrypted sewing.

[0005] This utility model is implemented as follows: One objective of this invention is to provide a high-density sewing device, comprising a lower section of a machine housing and a stitch length adjustment mechanism. One end of the main control rod of the stitch length adjustment mechanism extends out of the lower section of the machine housing and is connected to one end of the main feed dog adjusting rod. A main feed dog scale plate is provided on the lower section of the machine housing. The main feed dog scale plate has a first arc-shaped hole centered on the axis of the main control rod. A connecting member passes through the first arc-shaped hole and is connected to the other end of the main feed dog adjusting rod and one end of a transmission plate. The other end of the transmission plate is connected to the output end of a drive component, which can drive the connecting member to move along the first arc-shaped hole under the action of the drive component, thereby causing the main feed dog adjusting rod to rotate around the main control rod to adjust the stitch length and realize the switching between high-density sewing and the stitch length required for the work. The action of the drive component is controlled by a controller. A first scale indication structure is formed between the main feed dog scale plate and the main feed dog adjusting rod.

[0006] In the aforementioned encrypted sewing device, the first scale indicator structure includes a second arc-shaped hole disposed on the main feed dog scale plate and concentric with the first arc-shaped hole. The radius of the second arc-shaped hole is smaller than the radius of the first arc-shaped hole. A first limiting structure restricting the rotation angle of the main feed dog adjusting rod is disposed within the second arc-shaped hole. A stitch length scale is disposed on the main feed dog scale plate at the edge of the second arc-shaped hole. A first indicator scale is disposed on the main feed dog adjusting rod. The first indicator scale is exposed through the second arc-shaped hole and is aligned with the stitch length scale to adjust to the corresponding stitch length.

[0007] In the aforementioned encrypted sewing device, the first limiting structure includes a first limiting nut and a second limiting nut that can move along a first arc-shaped hole, and the first limiting nut and the second limiting nut are located on both sides of the main feed adjustment rod.

[0008] In the aforementioned encrypted sewing device, the main feed adjustment rod is S-shaped, with one end set in a groove on the end face of the main control rod spindle and fixedly connected to the main control rod spindle via a connector, and the other end connected to the connector. The connecting plate is rotatably connected to the connector via a bushing.

[0009] In the aforementioned encrypted sewing device, the driving component is a cylinder, which includes a piston rod. The outer end of the piston rod is rotatably connected to the transmission plate via a fisheye joint or a ball joint and a screw.

[0010] In the aforementioned encrypted sewing device, a differential tooth adjustment mechanism is also included. The differential tooth adjustment mechanism includes a differential control lever spindle, one end of which extends out of the lower section of the housing and is connected to one end of the differential tooth adjustment rod. A differential tooth scale plate is provided on the lower section of the housing. A third arc-shaped hole with the axis of the differential control lever spindle as the center is provided on the differential tooth scale plate. An adjustment knob passes through the third arc-shaped hole and is connected to the differential tooth adjustment rod. Adjusting the position of the differential tooth adjustment rod on the third arc-shaped hole adjusts the differential ratio of the differential teeth. A second scale indication structure is formed between the differential tooth scale plate and the differential tooth adjustment rod.

[0011] In the aforementioned encrypted sewing device, the second scale indicator structure includes a fourth arc-shaped hole disposed on the differential tooth scale plate. The fourth arc-shaped hole is concentrically disposed with the third arc-shaped hole, and the radius of the fourth arc-shaped hole is larger than the radius of the third arc-shaped hole. A differential ratio scale is disposed on the outer surface of the differential tooth scale plate at the edge of the fourth arc-shaped hole. A second indicator scale is disposed on the differential tooth adjusting rod. The second indicator scale is exposed through the fourth arc-shaped hole and is aligned with the differential ratio scale to adjust the differential ratio. A second limiting structure is disposed in the fourth arc-shaped hole to limit the rotation angle of the differential tooth adjusting rod.

[0012] In the aforementioned encrypted sewing device, the second limiting structure includes a third limiting nut and a fourth limiting nut that can move along a fourth arc-shaped hole, and the third limiting nut and the fourth limiting nut are located on both sides of the differential tooth adjusting rod.

[0013] In the aforementioned encrypted sewing device, the drive component is mounted on a mounting plate, which is disposed on the outer side of the differential tooth scale plate and is fixed to the outer side of the lower section of the housing using the same fasteners as the differential tooth scale plate.

[0014] Another objective of this invention is to provide a sewing machine that includes the aforementioned encrypted sewing device.

[0015] The outstanding advantages of this utility model compared to the prior art are: This invention uses a drive unit, transmission plate, and main feed adjustment rod to drive the main control rod spindle to rotate, enabling rapid and reliable switching between the required stitch length and the denser sewing stitch length. It can automatically perform denser sewing at the start and end of sewing, significantly improving sewing efficiency and quality. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the sewing machine of this utility model; Figure 2 This is a front perspective view of the encrypted sewing device of this utility model; Figure 3 This is a three-dimensional view of the back of the encrypted sewing device of this utility model; Figure 4 This is a schematic diagram of the main feed adjustment rod of this utility model.

[0017] In the diagram: 1. Lower section of the housing; 2. Main control lever spindle; 3. Main feed adjustment lever; 4. Main feed scale plate; 5. First arc-shaped hole; 6. Connector; 7. Transmission plate; 8. Drive component; 9. Second arc-shaped hole; 10. Pitch scale; 11. First indicator scale; 12. First limit nut; 13. Second limit nut; 14. Fisheye connector; 15. Differential control lever spindle; 16. Differential feed adjustment lever; 17. Differential feed scale plate; 18. Third arc-shaped hole; 19. Adjustment knob; 20. Fourth arc-shaped hole; 21. Differential ratio scale; 22. Second indicator scale; 23. Third limit nut; 24. Fourth limit nut; 25. Mounting plate. Detailed Implementation

[0018] The present invention will be further described below with reference to specific embodiments. Example 1: See Figure 1 —4: This embodiment provides a high-density sewing device, which includes a lower section 1 of the machine housing and a stitch length adjustment mechanism. One end of the main control rod spindle 2 of the stitch length adjustment mechanism extends out of the lower section 1 of the machine housing and is connected to one end of the main feed adjustment rod 3. A main feed scale plate 4 is provided on the lower section 1 of the machine housing. The main feed scale plate 4 is provided with a first arc-shaped hole 5 centered on the axis of the main control rod spindle 2. A connecting piece 6 passes through the first arc-shaped hole 5 and is connected to the other end of the main feed adjustment rod 3 and one end of a transmission plate 7. The other end of the transmission plate 7 is connected to the output end of a drive member 8, and can drive the connecting piece 6 to move along the first arc-shaped hole 5 under the action of the drive member 8, thereby causing the main feed adjustment rod 3 to rotate around the main control rod spindle 2 to adjust the stitch length and realize the switching between high-density sewing and the stitch length required for the work. The action of the drive member 8 is controlled by a controller. A first scale indication structure is formed between the main feed scale plate 4 and the main feed adjustment rod 3. It should be noted that in this embodiment, the connecting piece 6 is a stepped screw. The threaded section of the stepped screw is screwed to the main feed adjustment rod 3, and the optical shaft section passes through and is movably set in the first arc-shaped hole 5.

[0019] This invention drives the main control rod and main shaft 2 to rotate via the drive component 8, transmission plate 7, and main feed adjustment rod 3, enabling rapid and reliable switching between the required stitch length and the denser sewing stitch length. It can automatically perform denser sewing at the start and end of sewing, and displays the stitch length through the first scale indicator structure, significantly improving sewing efficiency and quality.

[0020] Furthermore, the first scale indicator structure includes a second arc-shaped hole 9 disposed on the main feed scale plate 4, which is concentric with the first arc-shaped hole 5. The radius of the second arc-shaped hole 9 is smaller than the radius of the first arc-shaped hole 5. A first limiting structure is disposed inside the second arc-shaped hole 9 to limit the rotation angle of the main feed adjustment rod 3. A needle pitch scale 10 is disposed on the main feed scale plate 4 at the edge of the second arc-shaped hole 9. A first indicator scale 11 is disposed on the main feed adjustment rod 3. The first indicator scale 11 is exposed through the second arc-shaped hole 9 and is aligned with the needle pitch scale 10 to adjust to the corresponding needle pitch.

[0021] In addition, the first scale indicator structure can also adopt the following structure: the free end of the main feed adjustment rod 3 is extended and bent to form a groove, the lower edge of the main feed scale plate 4 is set into an arc shape concentric with the first arc hole 5, and a needle distance scale is set on the main feed scale plate 4, a first indicator scale is set on the main feed adjustment rod 3, and the lower edge of the main feed scale plate 4 is set in the groove of the main feed adjustment rod 3.

[0022] Specifically, the first limiting structure includes a first limiting nut 12 and a second limiting nut 13 that can move along the first arc-shaped hole 5. The first limiting nut 12 and the second limiting nut 13 are located on both sides of the main feed adjustment rod 3. It should be noted that the first limiting nut 12 and the second limiting nut 13 are respectively limited to the back of the main feed scale plate 4 by screws.

[0023] Furthermore, the main feed adjustment rod 3 of this invention is S-shaped, with one end set in a groove on the end face of the main control rod spindle 2 and fixedly connected to the main control rod spindle 2 by fasteners, and the other end connected to the connecting piece 6. The transmission plate 7 is rotatably connected to the connecting piece 6 through a bushing. The S-shaped bending structure effectively optimizes the movement trajectory of the components within a limited space and avoids interference with other parts.

[0024] In this embodiment, the driving component 8 is a cylinder or an electromagnet. The cylinder includes a piston rod, and the outer end of the piston rod is rotatably connected to the transmission plate 7 through a fisheye connector 14 or a ball joint and a screw.

[0025] Before sewing, the first limiting nut 12 and the second limiting nut 13 are manually adjusted to the desired positions. When the main feed adjustment rod 3 abuts against the first limiting nut 12, the first indicator scale 11 aligns with the corresponding stitch length scale 10, indicating the required stitch length. When the main feed adjustment rod 3 abuts against the second limiting nut 13, the first indicator scale 11 aligns with the corresponding stitch length scale 10, indicating the stitch length for denser sewing. When starting a new stitch, denser sewing is required. Therefore, the cylinder drives the piston rod to extend, causing the main feed adjustment rod 3 to abut against the second limiting nut 13. After starting the stitch, normal sewing begins. At this point, the cylinder drives the piston rod to retract until the main feed adjustment rod 3 abuts against the first limiting nut 12, and the stitch length is adjusted to the required size. Similarly, at the end of the sewing, denser sewing is also required. The cylinder drives the piston rod to extend again, driving the main feed adjustment rod 3 to abut against the first limit nut 12 and adjust to the stitch length for denser sewing.

[0026] This utility model also includes a differential tooth adjustment mechanism, which includes a differential control lever spindle 15. One end of the differential control lever spindle 15 extends out of the lower section 1 of the housing and is connected to one end of the differential tooth adjustment rod 16. A differential tooth scale plate 17 is provided on the lower section 1 of the housing. A third arc-shaped hole 18 with the axis of the differential control lever spindle 15 as the center is provided on the differential tooth scale plate 17. An adjustment knob 19 passes through the third arc-shaped hole 18 and is connected to the differential tooth adjustment rod 16. Adjusting the position of the differential tooth adjustment rod 16 on the third arc-shaped hole 18 adjusts the differential ratio of the differential teeth. A second scale indication structure is formed between the differential tooth scale plate 17 and the differential tooth adjustment rod 16, making adjustment quick and convenient.

[0027] Furthermore, the second scale indicator structure includes a fourth arc-shaped hole 20 disposed on the differential tooth scale plate 17. The fourth arc-shaped hole 20 is concentrically disposed with the third arc-shaped hole 18, and the radius of the fourth arc-shaped hole 20 is larger than the radius of the third arc-shaped hole 18. A differential ratio scale 21 is disposed on the outer surface of the differential tooth scale plate 17 at the edge of the fourth arc-shaped hole 20. A second indicator scale 22 is disposed on the differential tooth adjusting rod 16. The second indicator scale 22 is exposed through the fourth arc-shaped hole 20 and is aligned with the differential ratio scale 21 to adjust the differential ratio. A second limiting structure is disposed in the fourth arc-shaped hole 20 to limit the rotation angle of the differential tooth adjusting rod 16.

[0028] The second scale indicator structure can also be: extending the free end of the differential tooth adjustment rod 16 and bending it to form a groove, setting the outer edge of the differential tooth scale plate 17 as an arc edge concentric with the third arc hole, and setting the differential ratio scale on it, setting the second indicator scale on the differential tooth adjustment rod 16, and the outer edge of the differential tooth scale plate 17 is located in the groove.

[0029] Specifically, the second limiting structure includes a third limiting nut 23 and a fourth limiting nut 24 that can move along the fourth arc-shaped hole 20. The third limiting nut 23 and the fourth limiting nut 24 are located on both sides of the differential tooth adjusting rod 16.

[0030] Similarly, the third limiting nut 23 and the fourth limiting nut 24 are respectively limited to the back of the differential tooth scale plate 17 by screws.

[0031] Before sewing, the differential tooth adjusting rod 16 is manually adjusted to determine the differential ratio according to the sewing requirements. Then, the differential tooth adjusting rod 16 is limited by the third limit nut 23 and the fourth limit nut 24 to prevent the differential tooth adjusting rod 16 from being displaced due to machine vibration or other reasons during the sewing process, which would affect the sewing accuracy.

[0032] Furthermore, the drive component 8 of this utility model is mounted on the mounting plate 25, which is located on the outer side of the differential tooth scale plate 17 and shares the same fasteners with the differential tooth scale plate 17 to be fixed on the outer side of the lower section 1 of the housing. This realizes the structural integration of the drive component 8 and the differential adjustment mechanism, significantly simplifies the overall structural layout, reduces the number of independent parts and assembly processes, improves space utilization and assembly efficiency, and at the same time ensures the positioning accuracy and connection stability between the drive component 8 and the differential tooth adjustment mechanism.

[0033] Implementation 2: This embodiment provides a sewing machine that includes the aforementioned encrypted sewing device.

[0034] The above embodiments are only one of the preferred embodiments of this utility model and are not intended to limit the scope of implementation of this utility model. Therefore, all equivalent changes made in accordance with the shape, structure and principle of this utility model should be covered within the protection scope of this utility model.

Claims

1. A high-density sewing device, comprising a lower section of the machine housing (1) and a stitch length adjustment mechanism, wherein one end of the main control rod spindle (2) of the stitch length adjustment mechanism extends out of the lower section of the machine housing (1) and is connected to one end of the main feed dog adjusting rod (3), characterized in that: A main feed scale plate (4) is provided on the lower section (1) of the machine housing. The main feed scale plate (4) is provided with a first arc-shaped hole (5) with the axis of the main control rod spindle (2) as the center. The connecting piece (6) passes through the first arc-shaped hole (5) and is respectively connected to the other end of the main feed adjustment rod (3) and one end of the transmission plate (7). The other end of the transmission plate (7) is connected to the output end of the drive member (8). Under the action of the drive member (8), the connecting piece (6) can be driven to move along the first arc-shaped hole (5), so that the main feed adjustment rod (3) rotates around the main control rod spindle (2) to adjust the stitch length and realize the switching between the stitch length required for close sewing and the stitch length required for work. The action of the drive member (8) is controlled by the controller. A first scale indication structure is formed between the main feed scale plate and the main feed adjustment rod.

2. The encrypted sewing device according to claim 1, characterized in that: The first scale indicator structure includes a second arc-shaped hole (9) set on the main feed scale plate (4) and concentric with the first arc-shaped hole (5). The radius of the second arc-shaped hole (9) is smaller than the radius of the first arc-shaped hole (5). A first limiting structure is provided in the second arc-shaped hole (9) to limit the rotation angle of the main feed adjustment rod (3). A needle pitch scale (10) is provided on the main feed scale plate (4) at the edge of the second arc-shaped hole (9). A first indicator scale (11) is provided on the main feed adjustment rod (3). The first indicator scale (11) is exposed through the second arc-shaped hole (9) and is aligned with the needle pitch scale (10) to adjust to the corresponding needle pitch.

3. The encrypted sewing device according to claim 2, characterized in that: The first limiting structure includes a first limiting nut (12) and a second limiting nut (13) that can move along the first arc-shaped hole (5). The first limiting nut (12) and the second limiting nut (13) are located on both sides of the main feed adjustment rod (3).

4. A high-density sewing device according to claim 1, 2, or 3, characterized in that: The main feed adjustment rod (3) is S-shaped. One end of it is set in the groove on the end face of the main control rod spindle (2) and is fixedly connected to the main control rod spindle (2) through the connector (6). The other end is connected to the connector (6). The transmission plate (7) is rotatably connected to the connector (6) through the bushing.

5. The encrypted sewing device according to claim 1, characterized in that: The driving component (8) is a cylinder, which includes a piston rod. The outer end of the piston rod is rotatably connected to the transmission plate (7) through a fisheye joint (14) or a ball joint and a screw.

6. The encrypted sewing device according to claim 1, characterized in that: It also includes a differential tooth adjustment mechanism, which includes a differential control lever spindle (15). One end of the differential control lever spindle (15) extends out of the lower section (1) of the housing and is connected to one end of the differential tooth adjustment rod (16). A differential tooth scale plate (17) is provided on the lower section (1) of the housing. A third arc-shaped hole (18) with the axis of the differential control lever spindle (15) as the center is provided on the differential tooth scale plate (17). The adjustment knob (19) passes through the third arc-shaped hole (18) and is connected to the differential tooth adjustment rod (16). The position of the differential tooth adjustment rod (16) on the third arc-shaped hole (18) is adjusted to adjust the differential ratio of the differential tooth. A second scale indication structure is formed between the differential tooth scale plate and the differential tooth adjustment rod.

7. The encrypted sewing device according to claim 6, characterized in that: The second scale indicator structure includes a fourth arc-shaped hole (20) provided on the differential tooth scale plate (17). The fourth arc-shaped hole (20) is concentric with the third arc-shaped hole (18), and the radius of the fourth arc-shaped hole (20) is greater than the radius of the third arc-shaped hole (18). A differential ratio scale (21) is provided on the outer surface of the differential tooth scale plate (17) at the edge of the fourth arc-shaped hole (20). A second indicator scale (22) is provided on the differential tooth adjustment rod (16). The second indicator scale (22) is exposed through the fourth arc-shaped hole (20) and is aligned with the differential ratio scale (21) to adjust the differential ratio. A second limiting structure is provided in the fourth arc-shaped hole (20) to limit the rotation angle of the differential tooth adjustment rod (16).

8. The encrypted sewing device according to claim 7, characterized in that: The second limiting structure includes a third limiting nut (23) and a fourth limiting nut (24) that can move along the fourth arc-shaped hole (20). The third limiting nut (23) and the fourth limiting nut (24) are located on both sides of the differential tooth adjusting rod (16).

9. A high-density sewing device according to claim 6, 7, or 8, characterized in that: The drive component (8) is mounted on the mounting plate (25), which is located on the outer side of the differential tooth scale plate (17) and is fixed to the outer side of the lower section (1) of the housing with the same fasteners as the differential tooth scale plate (17).

10. A sewing machine, characterized in that: Includes the encrypted sewing device as described in any one of claims 1-9.

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