Swing structure for sewing machine

Abstract

The application discloses a swing structure of a sewing machine, which comprises an eccentric mechanism, a main shaft, a crank rocker mechanism, a transmission mechanism and a pressure rod. The main shaft is pivotally connected to a rack, and the main shaft is connected with the eccentric mechanism for driving the main shaft to swing. The crank rocker mechanism comprises a crank and a rocker for driving the crank to move. The crank moves and drives the pressure rod to move up and down through the transmission mechanism. The pressure rod is connected with a second mechanism. The main shaft is provided with a first pressing block and a second pressing block for abutting against the rocker. During the process that the main shaft swings by the eccentric mechanism, when the main shaft swings to abut against the rocker by the first pressing block, the rocker does not move; when the main shaft swings to abut against the rocker by the second pressing block, the second pressing block presses down the rocker, the rocker drives the pressure rod to move up through the crank and the transmission mechanism, and the pressure rod drives the second mechanism to move up, so that the second mechanism moves up and down intermittently. The second mechanism is driven to move up and down by the eccentric structure, and the structure is simple and easy to realize.

Description

TECHNICAL FIELD

[0001] The present application relates to the sewing machine technical field, especially a swing structure for sewing machine. BACKGROUND

[0002] Sewing machine is a machine that forms a stitch on the sewing material with a sewing thread, and interweaves or sews one or more layers of the sewing material. The presser foot is a component of the sewing machine, which is usually located below the face plate. Its main function is to push the fabric and the needle plate forward to complete the sewing. Specifically, its main functions are to help stabilize the fabric, push the needle plate, and control the sewing length, to accurately control the length and speed of sewing to adapt to different types of fabric and processes, and to ensure that the stitch is flat and beautiful. In short, the presser foot is a very important component of the sewing machine, which plays a key role in sewing, making the sewing more stable and accurate.

[0003] During the operation of the sewing machine, the presser foot often needs to be lifted or lowered. The driving mechanism of the presser foot used in the current sewing machine usually uses belt transmission, gears, and pneumatic elements to drive the presser foot to rise and fall, which makes the presser foot driving structure complex, cumbersome, large in size, poor in synchronization, and prone to failure. SUMMARY

[0004] The present application aims to solve the above technical problems and provides a swing structure for sewing machine.

[0005] The present application provides a swing structure for sewing machine, which comprises an eccentric mechanism, a main shaft, a crank rocker mechanism, a transmission mechanism, and a pressure rod. The main shaft is rotatably arranged on the frame through a hinge point. The main shaft has a first coupling point and a second coupling point. The first coupling point is connected to the eccentric mechanism for driving the main shaft to swing. The second coupling point is connected to a first mechanism.

[0006] The crank rocker mechanism comprises a crank and a rocker for driving the crank to move. The crank moves and drives the pressure rod to move up and down through the transmission mechanism. The pressure rod is connected to a second mechanism. An elastic member is arranged between the pressure rod and the frame.

[0007] The main shaft is provided with a first pressure block and a second pressure block for resisting the rocker. When the main shaft swings to the first pressure block and the rocker, the rocker does not move. The second mechanism is in a descending state under the action of the elastic member. When the main shaft swings to the second pressure block and the rocker, the second pressure block presses the rocker. The rocker drives the pressure rod to move upward through the crank and the transmission mechanism. The pressure rod drives the second mechanism to rise. The pressure rod compresses the elastic member and drives the second mechanism to rise. The second mechanism forms intermittent up and down movement in this way.

[0008] Further optimization, the eccentric mechanism comprises an eccentric wheel rotatably connected to the frame and a driving member mounted on the frame and driving the eccentric wheel to rotate, one end of the main shaft is connected to the eccentric wheel, the eccentric wheel is driven to rotate around the frame by the driving member, and the main shaft is driven to swing around the frame by the eccentric wheel, which is simple in structure and easy to realize.

[0009] As preferred, the crank-rocker mechanism further comprises a first swing joint, a second swing joint and a conversion shaft, the rocker is rotatably connected to the conversion shaft through the hinge point, the conversion shaft is connected to the crank through the first swing joint, and the crank is connected to the transmission mechanism through the second swing joint.

[0010] As preferred, a third coupling point is formed on the rocker, when the eccentric wheel swings in one angle range, the first pressing block and the third coupling point form a tangential relationship to drive the rocker to swing around the hinge point, and when the eccentric wheel swings in another angle range, the second pressing block has a radial movement path relative to the third coupling point to drive the rocker to swing around the hinge point.

[0011] As preferred, the transmission mechanism comprises a connecting rod and a third swing joint, one end of the connecting rod is connected to the second swing joint, and the other end is connected to the pressing rod through the third swing joint, and the second mechanism is connected below the pressing rod.

[0012] As preferred, the first pressing block and the second pressing block are detachably mounted on the main shaft.

[0013] As preferred, the first pressing block and the second pressing block each have a pressing surface abutting against the rocker, a stepped surface is arranged on the first pressing block and the second pressing block away from the pressing surface, and a connecting surface abutting against the stepped surface is arranged on the main shaft.

[0014] As preferred, a bearing abutting against the pressing surface is arranged on the rocker.

[0015] As preferred, the first mechanism is a lifting foot, and the lifting foot is connected to the second coupling point of the main shaft through a crank arm; the second mechanism is a mop wheel.

[0016] The technical advantage of this invention is that, by driving the main shaft to swing through an eccentric mechanism, the first and second pressure blocks on the main shaft sequentially contact the rocker arm during the eccentric motion. When the first pressure block contacts the rocker arm, the rocker arm does not move, and the second mechanism is in a natural downward state under the action of the elastic element. When the second pressure block contacts the rocker arm, the rocker arm drives the second mechanism to move upward through the crank-rocker mechanism and the transmission mechanism, while the elastic element is compressed. This reciprocating motion causes the second mechanism to move up and down. In other words, the downward pressure on the rocker arm is achieved through two pressure blocks, realizing the upward movement of the second mechanism without the need for a complex structure. Moreover, the structure is simple, easy to implement, stable, and reliable. An eccentric mechanism drives the main shaft and crank-rocker mechanism to move. Then, two pressure blocks at different positions on the main shaft press down to control the swing of the main shaft and crank-rocker mechanism. In addition, when the main shaft swings to the first pressure block, the first mechanism or other sewing machine moving parts can be connected to the main shaft. That is, the first pressure block controls the first mechanism, and the second pressure block controls the second mechanism, so that the first mechanism and the second mechanism move alternately, forming a one-to-two working mode. This simplifies the overall structure of the machine, makes the operation more stable, and makes loading and unloading more convenient. For example, the first mechanism is a presser foot and the second mechanism is a drag wheel, which can realize the intermittent up and down movement between the presser foot and the drag wheel. Attached Figure Description

[0017] Figure 1 This is an overall structural diagram of the invention;

[0018] Figure 2 This is a perspective view of the overall structure of the invention (frame omitted);

[0019] Figure 3 This is another perspective view of the overall structure of the invention (frame omitted);

[0020] Figure 4 This is another perspective view of the overall structure of the invention (frame omitted);

[0021] Figure 5 yes Figure 4 Enlarged view of point A in the middle;

[0022] Figure 6 This is another perspective view of the overall structure of the invention (frame omitted);

[0023] Figure 7 yes Figure 6 Enlarged view at point B in the middle;

[0024] Figure 8 This is an exploded view of the first pressing block, the second pressing block, and the main shaft in this invention;

[0025] Figure 9 This is a cross-sectional view of the structure between the pressure bar, elastic element and frame in this invention.

[0026] In the figure: 1, frame; 2, main shaft; 3, pressing rod; 4, rocker; 5, crank; 6, second mechanism; 7, first pressing block; 8, second pressing block; 9, curved arm; 10, first swing joint; 11, second swing joint; 12, conversion shaft; 13, connecting rod; 14, third swing joint; 15, lower pressing surface; 16, stepped surface; 17, bearing; 18, eccentric wheel; 19, adjusting rod; 20, elastic member; 21, first coupling point; 22, second coupling point; 23, third coupling point. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments in the present application belong to the scope of protection of the present application.

[0028] In the embodiment, as shown in the figure, it comprises a frame 1, and the frame 1 is provided with an eccentric mechanism, a main shaft 2, a crank rocker mechanism, a transmission mechanism and a pressing rod 3. Figure 1

[0029] The eccentric mechanism comprises an eccentric wheel 18, and the eccentric wheel 18 is connected with a driving member. The driving member drives the eccentric wheel 18 to rotate. In the embodiment, the frame 1 is further provided with a limiting structure in the shape of a circle. The eccentric wheel 18 rotates around the limiting structure under the driving of the driving member, so as to avoid the eccentric wheel 18 from deviating during rotation. The main shaft 2 has a first coupling point 21. The eccentric wheel 18 is rotationally connected to the first coupling point 21 through a rotating shaft. The eccentric shaft of the eccentric wheel 18 is connected with the driving member. The driving member is usually a motor fixed on the frame 1. The frame 1 is provided with an annular accommodating area for the rotation of the eccentric wheel 18. Under the driving of the driving member, the eccentric wheel 18 rotates eccentrically around the frame 1. When the eccentric wheel 18 rotates under the driving of the driving member, the main shaft 2 swings around the frame 1, so as to realize the swinging of the main shaft 2.

[0030] As shown in the figure, the main shaft 2 is provided with a first pressing block 7 and a second pressing block 8. In the embodiment, the main shaft 2 is a shaft-shaped strip. The first pressing block 7 and the second pressing block 8 are detachably installed on the main shaft 2 in sequence along the length direction of the main shaft 2. The first pressing block 7 and the second pressing block 8 are both L-shaped block structures, i.e., the first pressing block 7 and the second pressing block 8 both form stepped surfaces 16. The stepped surfaces 16 of the first pressing block 7 and the second pressing block 8 abut against the lower surface of the main shaft 2. The other surface of the first pressing block 7 and the second pressing block 8 is provided with an installation hole. The main shaft 2 is also provided with an installation hole at the corresponding position. The first pressing block 7 and the second pressing block 8 are installed in the installation holes through fasteners, so as to be connected to the main shaft 2, i.e., to realize detachable connection and ensure the stability of installation. The structure is simple and easy to realize, stable and easy to maintain. Figures 2 to 5 ​​

[0031] The crank-rocker mechanism comprises a crank 5 and a rocker 4, and further comprises a first swing joint 10, a second swing joint 11 and a conversion shaft 12. One end of the conversion shaft 12 is connected with the rocker 4, and the other end is connected with one end of the crank 5 through the first swing joint 10. The other end of the crank 5 is connected with the transmission mechanism through the second swing joint 11. Two through holes which are perpendicular to each other and are arranged in a transverse direction are formed in the first swing joint 10. The crank 5 is arranged in one of the through holes, and one end of the conversion shaft 12 is arranged in the other through hole. The other end of the conversion shaft 12 is fixedly connected with the rocker 4, so as to realize the crank-rocker mechanism. When the rocker 4 rotates, the rocker 4 drives the conversion shaft 12 to rotate, the conversion shaft 12 drives the first swing joint 10 to rotate, and the first swing joint 10 drives the crank 5 to rotate, so as to realize the transmission function of the crank-rocker mechanism.

[0032] That is, the rocker 4 has a third coupling point 23. When the eccentric wheel 18 swings in one angle range, the first pressing block 7 and the third coupling point 23 form a tangential relationship to drive the rocker 4 to swing around the hinge point. When the eccentric wheel 18 swings in another angle range, the second pressing block 8 has a radial movement path relative to the third coupling point 23 to drive the rocker 4 to swing around the hinge point, so as to realize that, in the process of swinging the main shaft 2 by the eccentric mechanism, when the main shaft 2 swings to the position where the first pressing block 7 abuts against the rocker 4, the rocker 4 does not move, and the second mechanism 6 is in a lowered state under the action of the elastic member 20. When the main shaft 2 swings to the position where the second pressing block 8 abuts against the rocker 4, the second pressing block 8 presses the rocker 4 downward, the rocker 4 drives the pressing rod 3 to move upward through the crank 5 and the transmission mechanism, the pressing rod 3 compresses the elastic member 20 and drives the second mechanism 6 to move upward. In this way, the second mechanism 6 moves up and down repeatedly.

[0033] The transmission mechanism comprises a connecting rod 13, a third swing joint 14 and a pressing rod 3. One end of the connecting rod 13 is connected with the second swing joint 11, and the other end is connected with the pressing rod 3 through the third swing joint 14. The second mechanism 6 is connected below the pressing rod 3. Specifically, the second swing joint 11 also has two through holes as mounting ends. One of the through holes is arranged with the crank 5, and the other through hole is arranged with the connecting rod 13. The connecting rod 13 and the crank 5 are arranged perpendicular to each other, that is, the crank 5 drives the second swing joint 11 to swing up and down, so as to drive the pressing rod 3 to move up and down reciprocally. The third swing joint 14 also has two through holes for installation, which are arranged with the connecting rod 13 and the pressing rod 3 respectively. When the connecting rod 13 moves up and down reciprocally, the third swing joint 14 moves up and down, so as to drive the pressing rod 3 to move up and down reciprocally. The pressing rod 3 drives the second mechanism 6 to move upward or downward.

[0034] Here, it needs to be explained that, as shown in FIG. 1, Figure 6 and 7As shown, the pressure rod 3 is arranged behind the third swing joint 14 and is slidingly connected to the frame 1, so that the pressure rod 3 can vertically move up and down, so that the pressure rod 3 forms a lever structure, and a driving member can be connected to the pressure rod 3 as a power source, so that the pressure rod 3 has a driving lifting function.

[0035] As shown in the figure, Figure 9 A spring 20 is arranged between the pressure rod 3 and the frame 1, and the frame 1 is provided with a mounting hole for the pressure rod 3 to move up and down. An adjusting rod 19 is arranged above the mounting hole. The adjusting rod 19 is installed in the mounting hole by a threaded connection. An axial through hole is formed in the top end of the pressure rod 3. The spring is sleeved in the mounting hole. One end of the spring abuts against the adjusting rod 19, and the other end abuts against the bottom surface of the axial through hole of the pressure rod 3. When the pressure rod 3 is pressed down, the spring plays a restoring role on the pressure rod 3, so that the pressure rod 3 rises, thereby realizing the up and down movement of the second mechanism 6. The compression degree of the spring is adjusted by adjusting the position of the adjusting rod 19.

[0036] In addition, as shown in the figure, Figure 8 The first pressing block 7 and the second pressing block 8 each have a pressing surface 15 abutting against the rocker 4. The surface of the first pressing block 7 and the second pressing block 8, which is away from the pressing surface 15, is a stepped surface 16. When the main shaft 2 drives the first pressing block 7 or the second pressing block 8 to press down, the pressing surface 15 of the first pressing block 7 or the second pressing block 8 directly abuts against the end of the rocker 4, thereby driving the rocker 4 to swing.

[0037] In another embodiment, the end of the rocker 4 is provided with a bearing 17, that is, the third coupling point 23 is provided with a bearing 17. When the first pressing block 7 or the second pressing block 8 contacts the third coupling point 23, the first pressing block 7 or the second pressing block 8 directly abuts against the outer peripheral wall of the bearing 17 through the pressing surface 15. Since the pressing surface 15 is a straight surface, the first pressing block 7 or the second pressing block 8 is in point contact with the rocker 4. In this way, the force is more concentrated, which is convenient for the rocker 4 to swing. At the same time, the point contact can effectively reduce the contact wear, thereby ensuring the precision and service life of the rocker 4.

[0038] It should be noted that the main shaft 2 is also connected to the frame 1 through a curved arm 9. At this time, the main shaft 2 is provided with a second coupling point 22. The curved arm 9 is rotationally connected to the second coupling point 22. The curved arm 9 is connected to a first mechanism (not shown in the figure). The main shaft 2 swings to drive the first mechanism to move up and down. When the first pressing block 7 on the main shaft 2 abuts against the rocker 4, the rocker 4 does not have a pressing action. At this time, the main shaft 2 swings to drive the curved arm 9 to move, thereby driving the first mechanism to lift. When the main shaft 2 swings to the second pressing block 8 abutting against the rocker 4, the second pressing block 8 presses the rocker 4. The rocker 4 drives the pressure rod 3 to move up through the crank 5 and the transmission mechanism, thereby driving the second mechanism 6 to lift. At this time, the main shaft 2 drives the curved arm 9, the curved arm 9 drives the first mechanism, so that the first mechanism moves down. Therefore, the first mechanism and the second mechanism 6 are staggered to move up and down.

[0039] In this embodiment, the first mechanism is a lifting presser foot, and the second mechanism 6 is a mop wheel. Of course, the first mechanism and the second mechanism 6 can be other components.

[0040] The complete working principle is that, in the process of the eccentric mechanism swinging the main shaft 2, when the main shaft 2 swings to the first pressing block 7 being in contact with the rocker 4, the rocker 4 does not act, and the first mechanism, i.e. the lifting presser foot, is raised; when the main shaft 2 swings to the second pressing block 8 being in contact with the rocker 4, the second pressing block 8 presses down the rocker 4, the rocker 4 drives the press rod 3 to move upward through the crank 5 and the transmission mechanism, the press rod 3 drives the second mechanism 6, i.e. the mop wheel, to rise, at this time, the first mechanism, i.e. the lifting presser foot, is lowered, so as to make the mop wheel 6 and the lifting presser foot form intermittent and staggered upward and downward movements.

[0041] Therefore, the main shaft 2 and the crank rocker mechanism are driven to move through an eccentric mechanism, then two pressing blocks at different positions of the main shaft 2 are used to realize the swinging of the main shaft 2 and the crank rocker mechanism, the staggered movement between the mop wheel and the lifting presser foot is realized without a complex structure, and the structure is simple, easy to realize and stable.

[0042] The present application is not limited to the above best embodiment, anyone can derive other various forms of products under the inspiration of the present application, but regardless of any changes in shape or structure, any technical solution with the same or similar to the present application falls within the protection scope of the present application.

Claims

1. A swing structure for a sewing machine, characterized by comprising: The eccentric mechanism, the main shaft (2), the crank rocker mechanism, the transmission mechanism and the pressure rod (3) are arranged on the frame (1), the main shaft (2) is rotatably arranged on the frame (1) through a hinge point, the first coupling point (21) and the second coupling point (22) are formed on the main shaft (2), the first coupling point (21) is connected with the eccentric mechanism for driving the main shaft (2) to swing, and the second coupling point (22) is connected with the first mechanism; The crank rocker mechanism comprises a crank (5) and a rocker (4) for driving the crank (5) to act, the crank (5) acts and drives the pressure rod (3) to move up and down through the transmission mechanism, the pressure rod (3) is connected with the second mechanism (6), and the elastic element (20) is arranged between the pressure rod (3) and the frame (1), The main shaft (2) is provided with the first pressing block (7) and the second pressing block (8) for abutting against the rocker (4), When the main shaft (2) swings to the first pressing block (7) and the rocker (4) abut against each other, the rocker (4) does not act, and the second mechanism (6) is in a descending state under the action of the elastic element (20); when the main shaft (2) swings to the second pressing block (8) and the rocker (4) abut against each other, the second pressing block (8) presses the rocker (4), the rocker (4) drives the pressure rod (3) to move upwards through the crank (5) and the transmission mechanism, the pressure rod (3) compresses the elastic element (20) and drives the second mechanism (6) to move upwards, and the second mechanism (6) moves up and down in this way.

2. The oscillating structure for a sewing machine according to claim 1, characterized in that, The eccentric mechanism comprises an eccentric wheel (18) rotatably connected to the frame (1) and a driving element mounted on the frame (1) and driving the eccentric wheel (18) to rotate, and one end of the main shaft (2) is connected to the eccentric wheel (18).

3. The oscillating structure for a sewing machine according to claim 2, characterized in that, The crank rocker mechanism further comprises a first swing joint (10), a second swing joint (11) and a conversion shaft (12), the rocker (4) is rotatably connected to the conversion shaft (12) through a hinge point, the conversion shaft (12) is connected to the crank (5) through the first swing joint (10), and the crank (5) is further connected to the transmission mechanism through the second swing joint (11).

4. The oscillating structure for a sewing machine according to claim 3, characterized in that The rocker (4) forms a third coupling point (23), when the eccentric wheel (18) swings within an angle range, the first pressing block (7) and the third coupling point (23) form a tangential relationship to act so as not to drive the rocker (4) to swing, and when the eccentric wheel (18) swings within another angle range, the second pressing block (8) has a radial movement path relative to the third coupling point (23) to drive the rocker (4) to swing around the hinge point.

5. The oscillating structure for a sewing machine according to claim 4, characterized in that The transmission mechanism comprises a connecting rod (13) and a third swing joint (14), one end of the connecting rod (13) is connected to the second swing joint (11), the other end is connected to the pressure rod (3) through the third swing joint (14), and the second mechanism (6) is connected below the pressure rod (3).

6. The oscillating structure for a sewing machine according to claim 4, wherein The first pressing block (7) and the second pressing block (8) are detachably mounted on the main shaft (2).

7. The oscillating structure for a sewing machine according to claim 6, wherein The first pressing block (7) and the second pressing block (8) each have a lower pressing surface (15) in contact with the rocker (4), and the first pressing block (7) and the second pressing block (8) are provided with a stepped surface (16) at a position away from the lower pressing surface (15), and the main shaft (2) is provided with a connecting surface in contact with the stepped surface (16).

8. The oscillating structure for a sewing machine according to claim 7, wherein The rocker (4) is provided with a bearing (17) in contact with the lower pressing surface (15).

9. The oscillating structure for a sewing machine according to claim 1, wherein The first mechanism is a lifting pressing foot, and the lifting pressing foot is connected to the second coupling point (22) of the main shaft through a curved arm; and the second mechanism (6) is a mop wheel.

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