Driving device of sewing machine

Abstract

The technical scheme belongs to the technical field of sewing machines, and particularly relates to a driving device of a sewing machine. The presser foot lifting mechanism is provided with a presser foot lifting receiving end; the backstitching mechanism is provided with a backstitching receiving end; the driving mechanism is used for driving the thread trimming mechanism, the presser foot lifting mechanism and the backstitching mechanism to work independently; the driving motor is provided with a first output end and a second output end; the first transmission part is arranged on the first output end in a sleeving mode and provided with a transmission sliding groove, and the thread trimming receiving end movably abuts against the transmission sliding groove so that the thread trimming mechanism can work; the second output end is sleeved with the transmission crank, and the transmission crank movably abuts against the presser foot lifting receiving end so that the presser foot lifting mechanism can work; and the second transmission part is arranged on the second output end in a sleeving mode and provided with a transmission protruding block, and the transmission protruding block is movably arranged in the transmission long groove of the backstitch receiving end so that work of the backstitch mechanism can be achieved.

Description

Technical Field

[0001] This technical solution relates to the technical field of sewing machines, specifically to a driving device for 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 as to interweave or sew together one or more layers of sewing materials.

[0003] Current sewing machines generally have functions of thread cutting, thread loosening and reverse sewing. The thread cutting function and the thread loosening function are used in combination, and the reverse sewing function runs independently. They operate independently of each other, which leads to the need for multiple drive sources to work. This will cause the sewing machine to increase in volume, the structure to become complex, and it is inconvenient for later maintenance and upkeep. At the same time, the synchronism cannot be guaranteed, affecting the sewing effect of the sewing machine. Therefore, the mechanism inside the sewing machine still needs to be improved to simplify the structure and reduce the volume.

[0004] Chinese Patent CN218372756U discloses a sewing machine thread cutting, presser foot lifting, reverse sewing one-drive-three mechanism. Although this sewing machine realizes the function of "one-drive-three", it has the following disadvantages in actual use:

[0005] 1. The thread cutting assembly is arranged at one end of the rotating shaft, and the presser foot lifting assembly and the reverse sewing assembly are connected to the other end of the rotating shaft. When the thread cutting assembly, the presser foot lifting assembly and the reverse sewing assembly are working, there is no structure to ensure that the three work independently.

[0006] 2. This kind of "one-drive-three" sewing machine has a complex structure, a large volume and poor functionality. Summary of the Invention

[0007] The purpose of this technical solution is to provide a driving device for a sewing machine, which drives the thread cutting mechanism, the presser foot lifting mechanism and the reverse sewing mechanism to work independently through the first transmission member, the transmission crank and the second transmission member, so as to solve the problem of movement interference in the "one-drive-three" structure.

[0008] The purpose of this technical solution is achieved as follows:

[0009] A driving device for a sewing machine, comprising: a thread cutting mechanism having a thread cutting receiving end; a presser foot lifting mechanism having a presser foot lifting receiving end; a reverse sewing mechanism having a reverse sewing receiving end; and a driving mechanism for driving the thread cutting mechanism, the presser foot lifting mechanism and the reverse sewing mechanism to work independently; wherein, the driving mechanism includes: a driving motor having a first output end and a second output end, the first output end is used to drive the thread cutting mechanism to work, and the second output end is used to drive the presser foot lifting mechanism and the reverse sewing mechanism to work; a first transmission member sleeved on the first output end and having a transmission chute, the thread cutting receiving end is movably abutted against the transmission chute; a transmission crank sleeved on the second output end and movably abutted against the presser foot lifting receiving end; and a second transmission member sleeved on the second output end and having a transmission convex block, the transmission convex block is movably placed in a transmission long groove of the reverse sewing receiving end; wherein, the transmission crank has a presser foot working arc surface and a reverse sewing working arc surface; when the driving motor rotates forward, the presser foot lifting receiving end is movably abutted against the presser foot working arc surface, and the presser foot lifting mechanism works to rise. At the same time, the transmission chute moves away from the thread cutting receiving end so that the thread cutting mechanism does not work; when the driving motor rotates reversely, the presser foot lifting receiving end is movably abutted against the reverse sewing working arc surface, the transmission chute presses down the thread cutting receiving end so that the thread cutting mechanism works, and at the same time, the transmission convex block drives the reverse sewing mechanism to work through the transmission long groove.

[0010] Preferably, the reverse sewing working arc surface includes an arc surface one and an arc surface two; when the presser foot lifting receiving end cooperates with the arc surface one and the driving motor rotates forward, the transmission convex block drives the reverse sewing mechanism through the transmission long groove to realize reverse sewing of the sewing machine; when the presser foot lifting receiving end cooperates with the arc surface two and the driving motor rotates reversely, the transmission convex block drives the reverse sewing mechanism through the transmission long groove to realize forward sewing of the sewing machine.

[0011] Preferably, the transmission chute has a long side and a short side, and a notch is formed at the short side; when the driving mechanism rotates forward, the thread cutting receiving end disengages from the transmission chute at the notch; when the driving mechanism rotates reversely, the long side presses down the thread cutting receiving end and drives the thread cutting receiving end to move.

[0012] Preferably, the presser foot working arc surface is set as a lift arc surface.

[0013] Preferably, the reverse sewing working arc surface is set as a base arc surface.

[0014] Preferably, the presser foot working arc surface, the arc surface one and the arc surface two are connected end to end in sequence.

[0015] Preferably, the transmission crank further has a stop groove located between the presser foot working arc surface and the arc surface two; when the presser foot lifting receiving end is placed in the stop groove, the driving motor stops working.

[0016] Preferably, a first fixing pin is provided on the first transmission member.

[0017] Preferably, a crank fixing pin is provided on the transmission crank.

[0018] Preferably, a second fixing pin is provided on the second transmission member.

[0019] The prominent and beneficial technical effects of this technical solution compared with the prior art are as follows:

[0020] 1. The drive motor designed in this technical solution can drive the thread cutting assembly, the presser foot lifting assembly, and the reverse sewing assembly to work, and through the surface structure of the transmission crank, the independent work of the three is realized, ensuring that there is no movement interference among the three during work.

[0021] 2. The transmission crank designed in this technical solution includes a presser foot working arc surface and a reverse sewing working arc surface, and the reverse sewing working arc surface includes a first arc surface and a second arc surface. When the second output end rotates and the presser foot receiving end abuts on different arc surfaces, the corresponding different mechanisms work independently. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic structural diagram of this technical solution.

[0023] Figure 2 It is a schematic structural diagram of the thread cutting assembly.

[0024] Figure 3 It is a schematic structural diagram of the presser foot lifting assembly and the reverse sewing assembly.

[0025] Figure 4 It is a schematic structural diagram of the transmission crank and the presser foot receiving end.

[0026] Reference numerals: 1. Thread cutting mechanism; 11. Thread cutting receiving end; 2. Presser foot lifting mechanism; 21. Presser foot receiving end; 3. Reverse sewing mechanism; 31. Reverse sewing receiving end; 32. Transmission long groove; 4. Driving mechanism; 41. Drive motor; 42. First output end; 43. Second output end; 44. First transmission member; 45. Transmission crank; 46. Second transmission member; 47. Presser foot working arc surface; 48. Reverse sewing working arc surface; 49. First arc surface; 50. Second arc surface; 52. Transmission sliding groove; 53. Transmission convex block; 54. Positioning groove; 55. First fixing pin; 56. Crank fixing pin; 57. Second fixing pin. DETAILED DESCRIPTION OF THE INVENTION

[0027] The following further details the specific implementation manners of this technical solution with reference to the drawings.

[0028] As Figure 1As shown in the figure, a driving device of a sewing machine includes a thread cutting mechanism 1, a presser foot lifting mechanism 2, a reverse sewing mechanism 3 and a driving mechanism 4. This application makes improvements on how to integrate the thread cutting mechanism 1, the presser foot lifting mechanism 2 and the reverse sewing mechanism 3 onto the driving mechanism 4 to achieve the independent operation of the thread cutting mechanism 1, the presser foot lifting mechanism 2 and the reverse sewing mechanism 3 respectively.

[0029] Specifically, the driving mechanism 4 includes a driving motor 41, a motor shaft, a first transmission member 44, a transmission crankshaft and a second transmission member 46. The motor shaft has a first output end 42 and a second output end 43. The first transmission member 44 is sleeved on the first output end 42 and is used to cooperate with the thread cutting receiving end 11 of the thread cutting mechanism 1. Both the transmission crank 45 and the second transmission member 46 are sleeved on the second output end 43 and respectively cooperate with the presser foot lifting receiving end 21 of the presser foot lifting mechanism 2 and the reverse sewing receiving end 31 of the reverse sewing mechanism 3.

[0030] When the motor shaft rotates, the first output end 42 and the second output end 43 rotate synchronously. In actual operation, the motor shaft only rotates a specific angle instead of a full circle. In particular, this application improves the structure of the transmission crank 45 to achieve the stage - by - stage independent operation of the thread cutting mechanism 1, the presser foot lifting mechanism 2 and the reverse sewing mechanism 3 when the motor shaft drives the transmission crank 45 to rotate. That is, when the rotation angle of the motor shaft is within a certain range, the thread cutting mechanism 1 works alone, and the presser foot lifting mechanism 2 and the reverse sewing mechanism 3 do not work; or the presser foot lifting mechanism 2 works alone, and the thread cutting mechanism 1 and the reverse sewing mechanism 3 do not work; or the reverse sewing mechanism 3 works, and the thread cutting mechanism 1 and the presser foot lifting mechanism 2 do not work. In this way, the movement interference during the operation of the three mechanisms can be avoided.

[0031] As Figures 1-4 shown, the transmission crank 45 is arranged inside the second transmission member 46. The transmission crank 45 has a presser foot lifting working arc surface 47 and a reverse sewing working arc surface 48. The presser foot lifting working arc surface 47 is a lift arc surface, and the reverse sewing working arc surface 48 is a base arc surface. Therefore, Figure 4 in the figure, several points are marked on the transmission crank 45. The area between point A and point B is the presser foot lifting working arc surface 47, and the area between point B and point D is the reverse sewing working arc surface 48. When the second output end 43 drives the transmission crank 45 to rotate, during the process that the contact point between the presser foot lifting receiving end 21 and the transmission crank 45 changes from point B to point A, the transmission crank 45 gradually raises the presser foot lifting receiving end 21 to achieve the operation and lifting of the presser foot lifting mechanism 2; during the process that the contact point changes from point B to point D, the transmission crank 45 and the presser foot lifting receiving end 21 rotate smoothly, so the presser foot lifting mechanism 2 has no action. At the same time, the first output end 42 drives the first transmission member 44 to rotate and press down the thread cutting receiving end 11 to achieve the operation of the thread cutting mechanism 1 for cutting the thread. This design method can effectively ensure the independent operation of the presser foot lifting mechanism 2 and the thread cutting mechanism 1.

[0032] Further, the reverse sewing working arc surface 48 includes an arc surface one 49 and an arc surface two 50. The arc surface between point B and point C is the arc surface one 49, and the arc surface between point C and point D is the arc surface two 50. When the contact point changes from point C to point B, the reverse sewing receiving end 31 controls the reverse sewing mechanism 3 to perform reverse sewing; when the contact point changes from point C to point D, the reverse sewing receiving end 31 controls the reverse sewing mechanism 3 to perform forward sewing. Therefore, when the contact point is located at point C, it is the initial position for the driving device to control the operation of each mechanism. All working states of the sewing machine start to be controlled by the movement when the contact point is at the initial position. So in actual work, we need to find this initial position and adjust the contact point to the initial position. Therefore, we respectively set a fixing pin one 55, a crank fixing pin 56, and a fixing pin two 57 on the transmission part one 44, the transmission crank 45, and the transmission part two 46 to adjust the positions of the transmission part one 44, the transmission crank 45, and the transmission part two 46 arranged on the motor shaft.

[0033] Furthermore, a stop groove 54 is also provided on the transmission crank 45. When the presser foot lifting receiving end 21 rotates and falls into the stop groove 54, the driving motor 41 stops working, which can protect the thread cutting mechanism 1 and the reverse sewing mechanism 3 from being damaged due to overwork.

[0034] As Figures 1-4 shown, the transmission part one 44 has a transmission sliding groove 52. The transmission sliding groove 52 has a long side and a short side. When the presser foot lifting mechanism 2 works, the thread cutting receiving end 11 disengages from the short side of the transmission sliding groove 52 and thus does not touch the transmission sliding groove 52. Therefore, the thread cutting mechanism 1 does not work. On the contrary, the long side can press down the thread cutting receiving end 11 to make it enter the transmission sliding groove 52 and drive the thread cutting mechanism 1 to work.

[0035] Further, the transmission part two 46 has a transmission convex block 53, and the reverse sewing receiving end 31 has a transmission long groove 32. The transmission convex block 53 is movably abutted against the inner wall of the transmission long groove 32. The transmission part two 46 rotates following the second output end 43, so that the transmission convex block 53 drives the reverse sewing receiving end 31 to rotate to realize the operation of the reverse sewing mechanism 3. When the transmission convex block 53 is at the midpoint in the transmission long groove 32, the contact point is at point C. Therefore, when the contact point changes from point C to point B, the transmission convex block 53 displaces to the upper end of the transmission long groove 32, and vice versa.

[0036] It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those familiar with this technology to understand and read, and are not used to limit the conditions for the implementation of the present utility model. Therefore, they do not have substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size, without affecting the effects that the present utility model can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of description and are not used to limit the scope of implementation of the present utility model. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope within which the present utility model can be implemented.

[0037] It should also be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may be an intermediate element present at the same time. When an element is referred to as "connected to" another element, it can be directly connected to the other element or it can also be indirectly connected to the other element through an intermediate element.

[0038] In addition, the descriptions involving "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of such features. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0039] The above shows and describes the basic principles, main features, and advantages of this technical solution. Those skilled in the art of this industry should understand that this technical solution is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of this technical solution. Without departing from the spirit and scope of this technical solution, this technical solution will have various changes and improvements, and these changes and improvements all fall within the scope of this technical solution required to be protected. The scope of protection required by this technical solution is defined by the appended claims and their equivalents.

Claims

1. A driving device for a sewing machine, characterized in that: include: A thread trimming mechanism (1) having a thread trimming receiving end (11); A presser foot lifting mechanism (2), which has a presser foot lifting receiving end (21); a backstitch mechanism (3) having a backstitch receiving end (31); and A driving mechanism (4) for driving the thread trimming mechanism (1), the presser foot lifting mechanism (2) and the reverse stitching mechanism (3) to work independently of each other; Wherein, the driving mechanism (4) comprises: A driving motor (41) having a first output end (42) and a second output end (43), wherein the first output end (42) is used to drive the thread trimming mechanism (1) to work, and the second output end (43) is used to drive the presser foot lifting mechanism (2) and the reverse stitching mechanism (3) to work; A transmission member (44) is sleeved on the first output end (42) and has a transmission slide groove (52), and the thread trimming receiving end (11) is movably abutted against the transmission slide groove (52); A transmission crank (45) is sleeved on the second output end (43) and movably abuts against the presser foot lifting receiving end (21); and A second transmission member (46) is sleeved on the second output end (43) and has a transmission convex block (53), wherein the transmission convex block (53) is movably disposed in the transmission long groove (32) of the reverse stitch receiving end (31); The transmission crank (45) has a presser foot lifting working arc surface (47) and a reverse stitching working arc surface (48); when the driving motor (41) rotates forward, the presser foot lifting receiving end (21) movably abuts against the presser foot lifting working arc surface (47), and the presser foot lifting mechanism (2) works and rises, and at the same time, the transmission slide groove (52) moves away from the thread trimming receiving end (11) so that the thread trimming mechanism (1) does not work; When the driving motor (41) rotates in the reverse direction, the presser foot lifting receiving end (21) moves to abut against the reverse stitching working arc surface (48), and the transmission slide groove (52) presses down the thread trimming receiving end (11) to make the thread trimming mechanism (1) work. At the same time, the transmission protrusion (53) drives the reverse stitching mechanism (3) to work through the transmission long groove (32).

2. A driving device for a sewing machine according to claim 1, characterized in that: The reverse seam working arc surface (48) comprises an arc surface 1 (49) and an arc surface 2 (50); When the presser foot lifting receiving end (21) cooperates with the arc surface 1 (49) and the driving motor (41) rotates forward, the transmission protrusion (53) drives the reverse stitching mechanism (3) through the transmission long slot (32) to realize reverse stitching of the sewing machine; When the presser foot lifting receiving end (21) cooperates with the second arc surface (50) and the driving motor (41) rotates in the reverse direction, the transmission protrusion (53) drives the reverse stitching mechanism (3) through the transmission long slot (32) to realize the forward stitching of the sewing machine.

3. A driving device for a sewing machine according to claim 2, characterized in that: The transmission slide groove (52) has a long side and a short side, and a notch is formed at the short side; When the driving mechanism (4) rotates forward, the thread trimming receiving end (11) is separated from the transmission sliding groove (52) from the notch; When the driving mechanism (4) is reversed, the long side presses down the thread trimmer receiving end (11) and drives the thread trimmer receiving end (11) to move.

4. A driving device for a sewing machine according to claim 3, characterized in that: The presser foot lifting working arc surface (47) is arranged as a lift arc surface.

5. A driving device for a sewing machine according to claim 3, characterized in that: The reverse-sewing working arc surface (48) is configured as a base arc surface.

6. A driving device for a sewing machine according to claim 4 or 5, characterized in that: The presser foot lifting working arc surface (47), arc surface one (49) and arc surface two (50) are connected end to end in sequence.

7. A driving device for a sewing machine according to claim 6, characterized in that: The transmission crank (45) also has a stop groove (54), and the stop groove (54) is located between the presser foot lifting working arc surface (47) and the second arc surface (50); When the presser foot lifting receiving end (21) is placed in the stop groove (54), the driving motor (41) stops working.

8. A driving device for a sewing machine according to claim 7, characterized in that: The transmission member 1 (44) is provided with a fixing pin 1 (55).

9. A driving device for a sewing machine according to claim 7, characterized in that: The transmission crank (45) is provided with a crank fixing pin (56).

10. A driving device for a sewing machine according to claim 7, characterized in that: The second transmission member (46) is provided with a second fixing pin (57).

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