Thread trimming and presser foot lifting mechanism of overedger

Abstract

The utility model relates to the technical field of sewing machines, in particular to a thread trimming and presser foot lifting mechanism of an overedger, which comprises a presser foot arm component, a thread trimming component and a presser foot lifting component. The thread trimming assembly is used for executing a thread trimming action; the driving motor is arranged on the machine shell and used for driving the presser foot arm assembly and the thread trimming assembly to work; the transmission assembly is connected with the presser foot arm assembly and enables the driving motor to drive the presser foot arm assembly to work; a low-position shaft hole and a high-position shaft hole are formed in the machine shell. When the transmission assembly is connected with the presser foot arm assembly through a first transmission piece, the first transmission piece is arranged in the low-position shaft hole in a penetrating mode. Or when the transmission assembly is connected with the presser foot arm assembly through a second transmission piece, the second transmission piece is arranged in the high-position shaft hole in a penetrating mode.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a thread trimming and presser foot lifting mechanism of an overlock sewing machine. Background Art

[0002] The overlock sewing machine is a common sewing equipment in the field of clothing production. It can not only be used for hemming and preventing the seams of clothing from pilling, but can also be used for sewing work of a variety of different materials.

[0003] However, the prior art still has the following problems:

[0004] When an overlock sewing machine is used to sew materials of different materials, due to the different properties and sizes of the sewing materials themselves, the seams may still deviate or wrinkles may occur during the sewing process, affecting production efficiency and product quality. Utility Model Content

[0005] The utility model aims to provide a thread trimming and presser foot lifting mechanism for an overlock sewing machine, so as to solve the problem that the current overlock sewing machine cannot match the properties of sewing materials of different materials when sewing, thereby reducing product quality.

[0006] The purpose of this utility model is achieved in this way:

[0007] A thread trimming and presser foot lifting mechanism for an overlock sewing machine, comprising:

[0008] A presser foot arm assembly, which is used to perform a presser foot lifting action;

[0009] A thread trimming component, which is used to perform a thread trimming action;

[0010] A driving motor is provided on the housing and is used to drive the presser arm assembly and the thread trimmer assembly to work;

[0011] a transmission assembly connected to the presser foot arm assembly and enabling the drive motor to drive the presser foot arm assembly to work;

[0012] The housing is provided with a low-position shaft hole and a high-position shaft hole;

[0013] When the transmission assembly is connected to the presser foot arm assembly using the transmission member 1, the transmission member 1 is inserted into the low-position shaft hole;

[0014] or,

[0015] When the transmission assembly is connected to the presser foot arm assembly using the second transmission member, the second transmission member is inserted into the high-position shaft hole.

[0016] Preferably, the rotating arm is formed at one end of the rotating shaft;

[0017] The first rotating shaft portion is connected to the swing arm of the presser foot arm assembly through the rotating arm.

[0018] Preferably, the second transmission member is directly connected to the swing arm of the presser foot arm assembly; one end of the second transmission member connected to the swing arm is a straight section; the straight section and the second transmission member are arranged along the same axis.

[0019] Preferably, a mounting position is recessed on the housing, and the drive motor can be arranged in the mounting position.

[0020] Preferably, a plurality of fixing seats are protrudingly formed on the peripheral side of the installation position, and screw holes are formed on the fixing seats;

[0021] A plurality of connecting legs are formed on the upper and lower sides of the driving motor, and a retaining groove is formed on the connecting legs. The retaining grooves correspond to the positions of the screw holes one by one, so that the driving motor can be connected to the housing by fixing bolts;

[0022] The protruding direction of the fixing seat is consistent with the cloth feeding direction; the opening of the clamping slot on the upper side of the driving motor is upward, and the opening of the clamping slot on the lower side of the driving motor is downward.

[0023] Preferably, a presser foot lifting cam is sleeved on the motor shaft of the driving motor;

[0024] The transmission assembly further comprises a presser foot lifting crank, one end of which is connected to the transmission member, and the other end of which is provided with a roller, and the roller abuts against the presser foot lifting cam;

[0025] The driving motor drives the presser foot arm assembly to work through the transmission assembly.

[0026] Preferably, a thread trimming cam is sleeved on the motor shaft of the driving motor;

[0027] The thread cutting assembly comprises:

[0028] a tangent crank on which a tangent knife is provided;

[0029] A thread trimming drive plate is rotatably arranged on the housing, one end of the thread trimming drive plate abuts against the peripheral side of the thread trimming cam, and the other end is connected to the thread trimming crank.

[0030] Preferably, a fixing pin is connected to the thread trimming drive plate, and a steel ball is sleeved on the fixing pin;

[0031] The steel ball is used to abut against the thread trimming cam.

[0032] Preferably, a connecting column is formed on the housing, and the thread trimmer drive plate is rotatably connected to one end of the connecting column through a rotating pin.

[0033] Preferably, a return spring is sleeved on the exterior of the connecting column;

[0034] The thread trimmer drive plate is provided with a connecting hole, and one end of the return spring is inserted into the connecting hole;

[0035] The return spring is used to drive the thread trimmer drive plate to return to its original position.

[0036] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0037] 1. The housing of this technical solution is provided with a low-position shaft hole and a high-position shaft hole. The transmission assembly for connecting the drive motor and the presser foot arm assembly can be disposed in the low-position shaft hole or the high-position shaft hole. When the transmission assembly can be disposed in the low-position shaft hole or the high-position shaft hole, the force exerted by the transmission assembly on the presser foot arm assembly and the amplitude of movement of the presser foot arm assembly are both different. This can change the force exerted by the presser foot of the presser foot arm assembly on the sewing material, so that the presser foot can better cooperate with the sewing action of sewing materials of different materials, thereby improving product quality.

[0038] 2. The structure of this technical solution is easy to disassemble and assemble, making it easy to replace the position of the transmission components and change the working mode. There is no need to purchase additional production equipment, which improves the applicability of a single device and reduces the company's production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic structural diagram of the first embodiment of the present invention;

[0040] Figure 2 This is a partial exploded view of the transmission assembly and the drive motor of the first embodiment of the present utility model;

[0041] Figure 3 It is a partial cross-sectional view of the first embodiment of the present utility model;

[0042] Figure 4 Schematic diagram of the downward pressing direction of the presser foot in the first embodiment of the present invention;

[0043] Figure 5 This is a schematic structural diagram of the second embodiment of the present utility model;

[0044] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0045] Figure 7 This is a partial exploded view of the thread trimming assembly of the second embodiment of the present invention;

[0046] Figure 8 It is a schematic diagram of the pressing direction of the presser foot in the second embodiment of the present invention.

[0047] Reference numerals:

[0048] 1. Casing; 11. Low-position shaft hole; 12. High-position shaft hole; 13. Mounting position; 14. Fixing seat; 15. Screw hole; 16. Sewing table; 17. Connecting column; 18. Dust cover;

[0049] 2. Presser foot arm assembly; 21. Presser foot; 22. Swing arm;

[0050] 3. Thread trimmer assembly; 31. Thread trimmer crank; 32. Thread trimmer; 33. Thread trimmer drive plate; 34. Fixing pin; 35. Steel ball; 36. Rotating pin; 37. Connecting hole; 38. Thread trimmer connecting rod;

[0051] 4. Transmission assembly; 42. Bushing; 43. Presser foot lift crank; 44. Roller;

[0052] 5. Drive motor; 51. Connecting foot; 52. Positioning slot; 53. Motor shaft; 54. Presser foot lift cam; 55. Thread trimmer cam; 56. Fixing bolt;

[0053] 6. Transmission member 1; 61. Rotating shaft 1; 62. Rotating arm;

[0054] 7. Transmission part 2; 71. Straight section;

[0055] 8. Return spring;

[0056] 9. The direction of movement of the presser foot when pressing down. DETAILED DESCRIPTION

[0057] The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0058] [Example 1]

[0059] like Figure 1-Figure 3 The thread trimming and presser foot lifting mechanism of the overlock sewing machine shown includes:

[0060] The presser foot arm assembly 2 is used to perform the presser foot lifting action;

[0061] A thread trimming component 3, which is used to perform a thread trimming action;

[0062] A driving motor 5 is provided on the housing 1 and is used to drive the presser arm assembly 2 and the thread trimmer assembly 3 to work;

[0063] The transmission assembly 4 is connected to the presser foot arm assembly 2 and enables the drive motor 5 to drive the presser foot arm assembly 2 to perform the presser foot lifting action.

[0064] Overlock sewing machines are a common type of sewing equipment that can handle sewing work with a variety of different materials. However, in actual sewing work, different models and specifications of overlock sewing machines are used according to the different properties of the sewing materials to improve the quality of the sewn products.

[0065] However, this not only requires sufficient space to store overlock machines of different models and specifications, but also increases the production and operation costs of garment processing companies, and is also inconvenient during sewing.

[0066] Therefore, this technical solution proposes a method of processing different materials and sewing products by changing the axis position of the presser foot. At the same time, this technical solution is easy to cooperate with different machine models, which can improve the adaptability of the overlock sewing machine to different sewing materials and improve the quality of sewn products.

[0067] A low-position shaft hole 11 and a high-position shaft hole 12 are provided on the casing 1. Depending on the material of the sewing material currently to be sewn, the transmission assembly 4 can be inserted into the low-position shaft hole 11 or the high-position shaft hole 12 to change the swing amplitude of the swing arm 22 of the presser foot arm assembly 2, so that the swing arm 22 drives the presser foot 21 to apply different pressures to the sewing material to prevent problems such as seam deviation or wrinkles in the sewing process.

[0068] In this embodiment, the transmission assembly 4 is connected to the swing arm 22 using a transmission member 6, which is inserted into the lower shaft hole 11. When one of the lower shaft hole 11 or the higher shaft hole 12 is unused, a dust cover 18 can be provided at the end of the lower shaft hole 11 or the higher shaft hole 12.

[0069] like Figures 1-4 As shown, the transmission member 6 includes a rotating shaft portion 61 and a rotating arm 62. The rotating arm 62 is formed at one end of the rotating shaft portion 61 and is connected to the swing arm 22.

[0070] The rotating shaft portion 61 is connected to the swing arm 22 of the presser foot arm assembly 2 through the rotating arm 62.

[0071] When the rotating shaft 61 rotates, the rotating arm 62 is connected to the swing arm 22, so that the swing arm 22 and the rotating shaft 61 rotate at the same angular velocity. However, because the swing arm 22 has a larger rotation radius, the actual swing path of the swing arm 22 is also larger.

[0072] Therefore, when the swing arm 22 drives the presser foot 21 downward, the angle between the moving direction 9 of the presser foot during downward movement and the vertical plane is smaller. As a result, when the presser foot 21 presses against the sewing material on the sewing table 16, the horizontal component of the force generated by the presser foot 21 is reduced. This increases the downward component of the force generated by the presser foot 21 while maintaining the driving force output by the drive motor 5. This allows the presser foot 21 to press more tightly against the sewing material.

[0073] This embodiment is more suitable for sewing cloth, has a good effect of preventing the cloth from wrinkling, and improves the quality of the product.

[0074] A shaft sleeve 42 is provided on the outer side of the rotating shaft portion 61 , and the shaft sleeve 42 is used to reduce the loss of the rotating shaft portion 61 .

[0075] Specific as Figure 2 As shown, the housing 1 is recessed with a mounting position 13, and the drive motor 5 can be arranged in the mounting position 13. The contour of the mounting position 13 matches the drive motor 5, so that the drive motor 5 is placed in the mounting position 13.

[0076] Furthermore, a plurality of fixing seats 14 are protrudingly formed on the peripheral side of the installation position 13 , and screw holes 15 are formed on the fixing seats 14 .

[0077] The drive motor 5 is formed with a plurality of connecting legs 51 , each of which is formed with a retaining groove 52 . The retaining groove 52 corresponds to the position of the screw hole 15 , so that the drive motor 5 can be connected to the housing 1 via a fixing bolt 56 .

[0078] Several connecting feet 51 are formed on the upper and lower sides of the driving motor 5, and a locking groove 52 is formed on the connecting feet 51. The locking groove 52 corresponds to the position of the screw hole 15 one by one, so that the driving motor 5 can be connected to the casing 1 through the fixing bolts 56.

[0079] The protruding direction of the fixing seat 14 is consistent with the cloth feeding direction, so that the position of the driving motor 5 after installation can be better determined, so that the driving motor 5 can accurately cooperate with the thread trimming assembly 3 and the transmission assembly.

[0080] The opening of the locking groove 52 on the upper side of the driving motor 5 is upward, and the opening of the locking groove 52 on the lower side of the driving motor 5 is downward.

[0081] In the present technical solution, the driving motor 5 can be conveniently disassembled and assembled, and is easy to be installed on an overlock sewing machine of the same model, thereby reducing the cost of maintenance and component replacement.

[0082] like Figures 1-4 As shown, a presser foot lifting cam 54 is sleeved on the motor shaft 53 of the driving motor 5 .

[0083] The transmission assembly 4 further includes a presser foot lifting crank 43, which is arranged at one end of the transmission member 1 6;

[0084] A roller 44 is provided on the presser foot lifting crank 43 , and the roller 44 abuts against the presser foot lifting cam 54 .

[0085] When the drive motor 5 is started, the motor shaft 53 drives the presser foot lifting cam 54 to rotate, and the presser foot lifting cam 54 pushes the roller 44 to drive the presser foot lifting crank 43 to rotate. The drive motor 5 can drive the presser foot arm assembly 2 to work through the transmission assembly 4.

[0086] like Figure 1-Figure 7 As shown, a thread trimming cam 55 is sleeved on the motor shaft 53 of the driving motor 5 .

[0087] The thread trimming component 3 includes:

[0088] A tangent crank 31 with a tangent knife 32 provided thereon;

[0089] The thread trimmer drive plate 33 is rotatably mounted on the housing 1 . One end of the thread trimmer drive plate 33 abuts against the circumference of the thread trimmer cam 55 , and the other end is connected to the thread trimmer crank 31 .

[0090] When the thread trimming drive plate 33 drives the thread trimming crank 31 to rotate through the thread trimming connecting rod 38, the thread trimmer 32 is used to perform the thread trimming action.

[0091] Specific as Figure 6 and Figure 7 As shown, a fixing pin 34 is connected to the thread trimmer drive plate 33 , and a steel ball 35 is sleeved on the fixing pin 34 . The steel ball 35 can rotate around the fixing pin 34 .

[0092] The steel ball 35 is used to abut against the thread trimming cam 55 .

[0093] When the driving motor 5 is started, the motor shaft 53 drives the thread trimming cam 55 to rotate, and the thread trimming cam 55 pushes the steel ball 35 to drive the thread trimming driving plate 33 to swing. The driving motor 5 drives the thread trimming assembly 3 to perform the thread trimming action.

[0094] Furthermore, a connecting column 17 is formed on the housing 1 , and the thread trimming drive plate 33 is rotatably connected to one end of the connecting column 17 via a rotating pin 36 .

[0095] The outer sleeve of the connecting column 17 is provided with a return spring 8;

[0096] A connecting hole 37 is formed on the thread trimming drive plate 33, and one end of the return spring 8 is passed through the connecting hole 37;

[0097] The reset spring 8 is used to drive the thread trimmer drive plate 33 to reset, so that the thread cutter 32 can be quickly reset to prevent the thread cutter 32 from affecting the next sewing action.

[0098] [Example 2]

[0099] like Figure 5-Figure 8 As shown, in this embodiment, when the transmission assembly 4 is connected to the presser arm assembly 2 using the second transmission member 7 , the second transmission member 7 is inserted into the high-position shaft hole 12 .

[0100] When the second transmission member 7 is inserted into the high-position shaft hole 12 , the second transmission member 7 is directly connected to the swing arm 22 of the presser foot arm assembly 2 .

[0101] One end of the second transmission member 7 connected to the swing arm 22 is a straight section 71 , and the straight section 71 and the second transmission member 7 are arranged along the same axis.

[0102] When the second transmission member 7 rotates, the swing amplitude of the swing arm 22 is relatively small.

[0103] Therefore, when the swing arm 22 drives the presser foot 21 to move, the presser foot 21 will be pressed against the upper end surface of the sewing table 16 at an angle closer to 45 degrees.

[0104] At this time, the downward pressure exerted by the presser foot 21 is relatively small, and thus is unlikely to affect the movement of the sewing material driven by the cloth feed assembly, thereby ensuring that the sewing material can move the set length and that the sewing needle does not deviate during sewing. The solution of this embodiment is more suitable for sewing knitwear and twill denim sewing materials.

[0105] It should be noted that the structures, proportions, sizes, etc. depicted in the drawings of this specification are only used to match the contents disclosed in the specification for the understanding and reading of those familiar with this technology, and are not used to limit the conditions for the implementation of the present invention. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed in the present invention without affecting the efficacy and purpose of the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be considered as the scope of the implementation of the present invention without substantially changing the technical content.

[0106] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element through an intervening element.

[0107] In addition, the descriptions of "first", "second", etc. in this application are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

Claims

1. A thread trimming and presser foot lifting mechanism for an overlock sewing machine, characterized in that: include: A presser foot arm assembly (2), which is used to perform a presser foot lifting action; A thread trimming component (3), which is used to perform a thread trimming action; A driving motor (5) is provided on the housing (1) and is used to drive the presser arm assembly (2) and the thread trimmer assembly (3) to work; A transmission assembly (4) is connected to the presser arm assembly (2) and enables the drive motor (5) to drive the presser arm assembly (2) to work; The housing (1) is provided with a low-position shaft hole (11) and a high-position shaft hole (12); When the transmission assembly (4) is connected to the presser foot arm assembly (2) using the transmission member 1 (6), the transmission member 1 (6) is inserted into the low-position shaft hole (11); or, When the transmission assembly (4) is connected to the presser foot arm assembly (2) using the second transmission member (7), the second transmission member (7) is inserted into the high-position shaft hole (12).

2. The thread trimming and presser foot lifting mechanism of an overlock sewing machine according to claim 1, characterized in that: The transmission member 1 (6) includes a rotating shaft portion 1 (61) and a rotating arm (62), and the rotating arm (62) is formed at one end of the rotating shaft portion 1 (61); The first rotating shaft portion (61) is connected to the swing arm (22) of the presser foot arm assembly (2) through the rotating arm (62).

3. The thread trimming and presser foot lifting mechanism of an overlock sewing machine according to claim 1, characterized in that: The second transmission member (7) is directly connected to the swing arm (22) of the presser foot arm assembly (2); one end of the second transmission member (7) connected to the swing arm (22) is a straight section (71); the straight section (71) and the second transmission member (7) are arranged along the same axis.

4. The thread trimming and presser foot lifting mechanism of an overlock sewing machine according to claim 1, characterized in that: A mounting position (13) is formed in a recessed manner on the housing (1), and the drive motor (5) can be arranged in the mounting position (13).

5. The thread trimming and presser foot lifting mechanism of an overlock sewing machine according to claim 4, characterized in that: A plurality of fixing seats (14) are formed on the peripheral side of the installation position (13), and screw holes (15) are formed on the fixing seats (14); A plurality of connecting legs (51) are formed on the upper and lower sides of the driving motor (5), and a retaining groove (52) is formed on the connecting legs (51). The retaining groove (52) corresponds to the position of the screw hole (15) in a one-to-one manner, so that the driving motor (5) can be connected to the housing (1) via a fixing bolt (56); The protruding direction of the fixing seat (14) is consistent with the cloth feeding direction; the opening of the locking groove (52) on the upper side of the driving motor (5) is upward, and the opening of the locking groove (52) on the lower side of the driving motor (5) is downward.

6. The thread trimming and presser foot lifting mechanism of an overlock sewing machine according to any one of claims 1 to 5, characterized in that: A presser foot lifting cam (54) is sleeved on the motor shaft (53) of the driving motor (5); The transmission assembly (4) further comprises a presser foot lifting crank (43), wherein the presser foot lifting crank (43) is arranged at one end of the transmission member; The presser foot lifting crank (43) is provided with a roller (44), and the roller (44) abuts against the presser foot lifting cam (54), so that the driving motor (5) can drive the presser foot arm assembly (2) to work through the transmission assembly (4).

7. The thread trimming and presser foot lifting mechanism of an overlock sewing machine according to any one of claims 1 to 5, characterized in that: A thread trimming cam (55) is sleeved on the motor shaft (53) of the driving motor (5); The thread cutting assembly (3) comprises: a tangent crank (31) on which a tangent knife (32) is provided; A thread trimming drive plate (33) is rotatably arranged on the housing (1), one end of the thread trimming drive plate (33) abuts against the peripheral side of the thread trimming cam (55), and the other end is connected to the thread trimming crank (31).

8. The thread trimming and presser foot lifting mechanism of an overlock sewing machine according to claim 7, characterized in that: The thread trimming drive plate (33) is connected to a fixing pin (34), and a steel ball (35) is sleeved on the fixing pin (34); The steel ball (35) is used for abutting against the thread trimming cam (55).

9. The thread trimming and presser foot lifting mechanism of an overlock sewing machine according to claim 7, characterized in that: A connecting column (17) is formed on the housing (1), and the thread trimming drive plate (33) is rotatably connected to one end of the connecting column (17) via a rotating pin (36).

10. The thread trimming and presser foot lifting mechanism of an overlock sewing machine according to claim 9, characterized in that: The outer portion of the connecting column (17) is provided with a return spring (8); The thread trimming drive plate (33) is provided with a connecting hole (37), and one end of the return spring (8) is inserted into the connecting hole (37); The reset spring (8) is used to drive the thread trimmer drive plate (33) to reset.

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