Presser foot lifting device of crank arm type edge folding sewing machine

Abstract

The utility model belongs to the technical field of crank arm type edge folding sewing machines, and particularly relates to a presser foot lifting device of a crank arm type edge folding sewing machine. The presser foot mechanism is arranged on the machine shell and used for abutting against cloth; the transmission mechanism is movably connected with the presser foot mechanism, the driving mechanism is movably connected with the transmission mechanism, and the presser foot mechanism is lifted by driving the transmission mechanism; the driving mechanism comprises a pushing seat, the pushing seat is arranged in the machine shell in a sliding mode, the upper end of the pushing seat movably abuts against an ejector rod of the transmission mechanism, and the lower end of the pushing seat extends out of the machine shell. The knee lifting component is arranged at the lower end of the machine shell and abuts against the end, extending out of the lower end of the machine shell, of the pushing base. The knee lifting component is used for driving the pushing seat to move upwards, and the transmission mechanism is matched to realize the presser foot lifting operation, so that the operation is visual and convenient, and the accuracy of the operation is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of a curved arm type hemming and sewing machine, in particular to a presser foot lifting device of a curved arm type hemming and sewing machine. Background Art

[0002] The curved arm hemming sewing machine, also known as the curved arm sewing machine, is suitable for sewing large, heavy or complex-shaped items, such as the sewing of columnar structures such as sleeves and trouser legs of some clothes. The presser foot is an important component of the curved arm hemming sewing machine. It applies pressure on the surface of the sewing material to ensure that the position of the sewing material does not shift and to ensure the reliability of the sewing material feeding.

[0003] Existing curved arm hemming sewing machines usually adopt a double pedal drive structure, that is, one pedal is used to control the sewing machine to perform sewing operations, and the other pedal is used to control the lifting of the presser foot. This operation method has some disadvantages. When a user is faced with two pedals with different functions, it is easy to step on the wrong pedal due to negligence or fatigue, resulting in errors in sewing fabrics and inconvenient operation. Summary of the invention

[0004] The utility model aims to provide a presser foot lifting device for a curved arm type hemming sewing machine, which uses a knee lifting component to move a push seat upward, and then cooperates with a transmission mechanism to realize the presser foot lifting operation, thereby improving the problem that users are prone to step on the wrong pedal and cause sewing errors.

[0005] A presser foot lifting device for a curved arm hemming sewing machine, comprising:

[0006] chassis;

[0007] A presser foot mechanism, which is arranged on the housing and is used to press the cloth;

[0008] A transmission mechanism, which is movably connected to the presser foot mechanism,

[0009] A driving mechanism, which is movably connected to the transmission mechanism and drives the transmission mechanism to lift the presser foot mechanism;

[0010] Wherein, the driving mechanism comprises:

[0011] A push seat, which is slidably disposed in the housing, and the upper end of the push seat movably abuts against the push rod of the transmission mechanism, and the lower end of the push seat extends out of the housing;

[0012] A knee lift member, which is disposed at the lower end of the housing and abuts against the end of the push seat extending out of the lower end of the housing;

[0013] The knee-lifting component is used to drive the push seat to move upward, and then cooperates with the transmission mechanism to realize the presser foot lifting operation.

[0014] Preferably, the driving mechanism further comprises: a driving member 1, which is used to replace the knee lifting member,

[0015] The driving member 1 is arranged at the lower end of the housing, and the output end of the driving member 1 is threadedly connected with a driving disk, and the driving disk supports the end of the push seat extending out of the lower end of the housing;

[0016] The driving member 1 drives the push seat to move upward through the driving disc, and then cooperates with the transmission mechanism to realize the presser foot lifting operation.

[0017] Preferably, the knee lift member comprises:

[0018] a rotating shaft rotatably disposed at the lower end of the housing;

[0019] A swinging member, wherein the middle part of the swinging member is rotatably mounted on the lower end of the housing, and the front end of the rotating shaft is connected to the middle part of the swinging member, and one end of the swinging member movably abuts against the end of the push seat extending from the lower end of the housing;

[0020] A swing rod connected to the rear end of the rotating shaft;

[0021] A knee support plate, which is arranged on the swing rod;

[0022] The human knee drives the swing rod to swing through the knee support plate, so that the rotating shaft rotates, thereby driving the swing member to swing, and further driving the push seat to move upward.

[0023] Preferably, one end of the swinging member has a mounting groove, and the lower end of the driving disk has a mounting post, and the mounting post is inserted into the mounting groove to enable the driving disk to be mounted on the swinging member.

[0024] Preferably, the other end of the swinging member is threadedly connected with a top screw, and the upper end of the top screw movably abuts against the lower end of the casing to limit the starting position of the knee rest plate.

[0025] Preferably, the presser foot mechanism at least comprises:

[0026] A pressure rod, which is slidably arranged on the housing;

[0027] A presser foot, which is arranged at the lower end of the press rod;

[0028] A rotation limiting assembly, which is installed in the housing and is used to limit the left and right swing of the presser foot;

[0029] The elastic member is sleeved on the pressing rod and is used to drive the pressing rod to move downward so that the presser foot presses the cloth.

[0030] Preferably, the rotation limiting assembly comprises: a limiting member 1 and a limiting member 2, wherein the limiting member 1 is installed on the pressure rod, and a limiting block is formed by protruding from the side end of the limiting member 1; an opening is provided on the housing, the opening is movably connected with the limiting member 2, and a limited space is formed between the limiting member 2 and the opening;

[0031] When the end of the limiting block extends into the opening, the second limiting member fixes the limiting block in the limiting space to limit the shaking of the pressure rod.

[0032] Preferably, the presser foot mechanism further comprises:

[0033] The adjusting member is threadedly connected to the housing, and the lower end of the adjusting member abuts against the upper end of the elastic member.

[0034] The force with which the presser foot presses the fabric is adjusted by adjusting the position of the adjusting member on the housing.

[0035] Preferably, a pressurizing mechanism is provided at the upper end of the presser foot mechanism:

[0036] The boosting mechanism comprises:

[0037] A second driving member is arranged at the upper end of the housing, and a driving end of the second driving member is inserted into the through hole of the adjusting member and movably connected to the upper end of the pressure rod, so as to drive the pressure rod to move downward.

[0038] Preferably, the transmission mechanism comprises:

[0039] A push rod, the lower end of which movably abuts against the upper end of the push seat;

[0040] A rear lever is rotatably disposed on the housing and movably connected to the upper end of the push rod;

[0041] A connecting rod, the rear end of which is movably connected to the rear lever;

[0042] A front lever, which is rotatably disposed on the housing and movably connected to the front end of the connecting rod;

[0043] A lifting member is movably connected to the front lever, and a lifting protrusion is provided at the lower end of the lifting member. The lifting protrusion movably abuts against the pressure rod of the presser foot mechanism to lift the pressure rod.

[0044] The purpose of the utility model is achieved in this way:

[0045] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

[0046] 1. The presser foot mechanism designed in the utility model realizes lifting the presser foot through a knee-lifting member, making the operation more intuitive and convenient. The user does not need to frequently step on two pedals with different functions, thereby reducing the possibility of operating errors and improving the accuracy of operation.

[0047] 2. A limited rotation assembly is arranged in the presser foot mechanism designed in the utility model. The limited rotation assembly limits the left and right swing of the presser foot on the press rod through the cooperation between the limiter 1 and the limiter 2, thereby avoiding the shaking of the material and causing the sewing position to be wrong, thereby improving the sewing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 It is a structural schematic diagram of the utility model.

[0049] Figure 2 It is a schematic diagram of the structure of the utility model when the casing is not installed.

[0050] Figure 3 It is an exploded view of the utility model.

[0051] Figure 4 It is a structural schematic diagram of the drive mechanism of the utility model installed on the casing.

[0052] Figure 5 It is an exploded view of the rotation limiting component of the utility model.

[0053] Figure 6 It is a structural schematic diagram of the rotation limiting component of the utility model.

[0054] Figure 7 It is a cross-sectional view of the presser foot mechanism and the booster mechanism of the utility model.

[0055] 1. Casing; 11. Opening; 12. Limiting member 2; 121. Limiting space; 2. Presser foot mechanism; 21. Press rod; 22. Limiting member 1; 221. Limiting block; 23. Elastic member; 24. Adjusting member; 241. Through hole; 3. Transmission mechanism; 31. Push rod; 32. Rear lever; 33. Connecting rod; 34. Front lever; 35. Lifting member; 351. Lifting protrusion; 4. Driving mechanism; 41. Push seat; 411. Guide rod; 42. Driving member 1; 43. Driving disk; 431. Mounting column; 5. Pressurizing mechanism; 51. Driving member 2; 6. Knee lifting member; 61. Rotating shaft; 62. Swinging member; 621. Mounting groove; 63. Rocker rod; 64. Knee rest plate; 65. Push screw; 66. Connecting block. DETAILED DESCRIPTION

[0056] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.

[0057] Combination Figure 1 and Figure 2A presser foot lifting device of a curved arm hemming sewing machine comprises: a casing 1, a presser foot mechanism 2, a transmission mechanism 3, a driving mechanism 4 and a pressurizing mechanism 5; the presser foot mechanism 2 is arranged on the casing 1 and is used to press cloth; the transmission mechanism 3 is movably connected to the presser foot mechanism 2, the driving mechanism 4 is movably connected to the transmission mechanism 3, and the transmission mechanism 3 is driven to lift the presser foot mechanism 2, thereby loosening the cloth.

[0058] like Figure 3 As shown, the driving mechanism 4 includes: a pushing seat 41 and a knee-lifting member 6, the pushing seat 41 is slidably arranged in the casing 1, and the upper end of the pushing seat 41 movably abuts against the push rod 31 of the transmission mechanism 3, and the lower end of the pushing seat 41 is formed with a guide rod 411, and the lower end of the guide rod 411 extends out of the casing 1; the knee-lifting member 6 is arranged at the lower end of the casing 1, and abuts against the end of the pushing seat 41 extending out of the lower end of the casing 1, that is, the knee-lifting member 6 abuts against the lower end of the guide rod 411; the pushing seat 41 is driven to move upward by the knee-lifting member 6, and then cooperates with the transmission mechanism 3 to realize the presser foot lifting operation.

[0059] like Figure 3 As shown, the driving mechanism 4 also includes a driving member 42. When the user does not want to use the knee-lifting component 6 to lift the presser foot, the knee-lifting component 6 is removed and the driving member 42 is installed on the lower end of the casing 1. The output end of the driving member 42 is threadedly connected with a driving disk 43. The driving disk 43 supports the end of the push seat 41 extending out of the lower end of the casing 1, that is, the upper end of the driving disk 43 movably abuts the lower end of the guide rod 411; the driving member 42 drives the push seat 41 to move upward through the driving disk 43, and then cooperates with the transmission mechanism 3 to realize the presser foot lifting operation.

[0060] Combination Figure 3 and Figure 4 The knee lifting component 6 includes: a rotating shaft 61, which is rotatably arranged at the lower end of the casing 1; a swinging member 62, a middle part of which is rotatably installed at the lower end of the casing 1, and the front end of the rotating shaft 61 is connected to the middle part of the swinging member 62, and one end of the swinging member 62 movably abuts against the lower end of the guide rod 411 of the push seat 41; a swing rod 63, which is fixed to the rear end of the rotating shaft 61 by a connecting block 66; a knee rest plate 64, which is arranged on the swing rod 63; the user pushes the knee rest plate 64 with his knee to drive the swing rod 63 to swing, so that the rotating shaft 61 rotates, thereby driving the swinging member 62 to swing, and then driving the push seat 41 to move upward.

[0061] like Figure 3As shown, one end of the swing member 62 has a mounting groove 621, and the lower end of the driving disk 43 has a mounting column 431. The mounting column 431 is inserted into the mounting groove 621 to realize the installation of the driving disk 43 on the swing member 62. When the knee lifting component 6 is used to lift the presser foot, the upper end of the driving disk 43 abuts against the lower end of the guide rod 411 of the push seat 41. The upper end of the driving disk 43 has a groove, and the guide rod 411 can be extended into the groove. The driving disk 43 is installed on the swing member 62 to improve the stability when lifting the push seat 41, and the lower end of the guide rod 411 is better stressed. Of course, in order to save costs, the driving disk 43 can be removed so that one end of the swing member 62 directly abuts against the lower end of the guide rod 411 of the push seat 41.

[0062] The other end of the swing member 62 is threadedly connected with a top screw 65, and the upper end of the top screw 65 movably abuts the lower end of the casing 1 to limit the starting position of the knee rest plate 64. The starting position is the position of the knee rest plate 64 on the rocker arm 63 after the top screw 65 limits the rotation of the swing member 62 when the knee lift component 6 is not working.

[0063] Combination Figure 3 and Figure 7 The presser foot mechanism 2 includes: a press rod 21, a presser foot, a rotation limiting assembly, an elastic member 23 and an adjusting member 24; the press rod 21 is slidably arranged on the housing 1, and a limit member 22 is installed at the lower section of the press rod 21; the presser foot is arranged at the lower end of the press rod 21 for pressing the cloth; the rotation limiting assembly is installed in the housing 1 for limiting the left and right swing of the presser foot; the elastic member 23 is a spring or a disc spring, which is sleeved on the press rod 21, and the two ends of the elastic member 23 are respectively against the limit member 22 and the adjusting member 24 , used to drive the pressure rod 21 to move downward so that the presser foot presses the cloth; the adjusting member 24 is threadedly connected to the casing 1, and by adjusting the position of the adjusting member 24 on the casing 1, the distance between the adjusting member 24 and the limiting member 22 changes, so that the elastic member 23 elastically deforms to adjust the force of the presser foot pressing the cloth. The adjusting member 24 is provided with a through hole 241. When the distance between the adjusting member 24 and the limiting member 22 is reduced, the upper end of the pressure rod 21 extends into the through hole 241.

[0064] like Figure 3 As shown, the limiting member 22 is sleeved on the pressure rod 21, and a threaded hole is opened at the side end of the limiting member 22, which is threadedly connected in the threaded hole and abuts against the side wall of the pressure rod 21 by screws or bolts, so that the limiting member 22 is fixed on the pressure rod 21.

[0065] Combination Figure 3 , Figure 5 , Figure 6 and Figure 7The rotation limiting assembly includes: a limiting member 22 and a limiting member 12, the limiting member 22 is installed on the pressure rod 21, and the side end of the limiting member 22 protrudes to form a limiting block 221; the casing 1 is provided with an opening 11, the opening 11 is movably connected to the limiting member 12, and the limiting member 12 and a side edge of the opening 11 form a limiting space 121; when the end of the limiting block 221 extends into the opening 11, the limiting member 12 fixes the limiting block 221 in the limiting space 121 to limit the shaking of the presser foot, and the limiting block 221 can move up and down in the opening 11.

[0066] In this embodiment, two limit members 12 are connected to the left and right edges of the opening 11 by screws, respectively. The limit members 12 are formed with protrusions, which penetrate into the opening 11. A limited space 121 is formed between the protrusions of the two limit members 12. By adjusting the position of the limit members 12 at the edge of the opening 11, the limit space 121 is reduced to limit the left and right shaking of the limit block 221, thereby reducing the left and right swing of the pressure rod 21, and the limit block 221 can move up and down in the limit space 121.

[0067] Combination Figure 2 , Figure 3 and Figure 7 The boosting mechanism 5 is arranged at the upper end of the presser foot mechanism 2: the boosting mechanism 5 includes: a second driving member 51, which is arranged at the upper end of the casing 1, and the driving end of the second driving member 51 is inserted into the through hole 241 of the adjusting member 24 and is movably connected to the upper end of the pressing rod 21, and is used to drive the pressing rod 21 to move downward. Through the second driving member 51, the presser foot can press the cloth, especially to prevent the thicker cloth from shaking.

[0068] The transmission mechanism 3 includes: a push rod 31, whose lower end movably abuts against the upper end of the push seat 41; a rear lever 32, which is rotatably arranged on the housing 1 and movably connected to the upper end of the push rod 31; a connecting rod 33, whose rear end is movably connected to the rear lever 32; a front lever 34, which is rotatably arranged on the housing 1 and movably connected to the front end of the connecting rod 33; a lifting member 35, which is movably connected to the front lever 34, and the lower end of the lifting member 35 has a lifting protrusion 351, and the lifting protrusion 351 is provided. The limit block 221 of the limit piece 22 on the pressure rod 21 is movably abutted against the pressure rod 21, and is used to lift the pressure rod 21. When the top rod 31 moves up, the rear lever 32 rotates, and the rear lever 32 drives the connecting rod 33 to move backward. The connecting rod 33 drives the front lever 34 to rotate, and the front lever 34 makes the lifting member 35 move up. The lifting member 35 abuts against and lifts the limit block 221 through the lifting protrusion 351. The limit block 221 moves up and realizes the upward movement of the pressure rod 21 through the limit piece 22, and finally the presser foot is lifted.

[0069] The specific working process of this scheme is as follows: when the knee lifting member 6 is used to lift the presser foot, the human body's knee presses against the knee support plate 64 and pushes the swing rod 63 to swing, the swing rod 63 drives the swing member 62 to rotate, one end of the swing member 62 or the upper end of the driving plate 43 pushes the push seat 41 to move up, the push seat 41 moves up and causes the lifting member 35 to lift up through the transmission mechanism 3, the lifting member 35 abuts against the lower end of the limit block 221 of the limit member 22 through the lifting protrusion 351 and drives the limit member 22 to move up, the limit member 22 causes the press rod 21 to move up, thereby lifting the presser foot, and when the driving mechanism 4 does not work, the elastic The movable member 23 pushes the limit member 22 to make the pressure rod 21 move downward, and the limit member 22 makes the lifting member 35 move downward through the limit block 221, and the lifting member 35 makes the pushing seat 41 move downward through the transmission mechanism 3, and the pushing seat 41 drives the swing member 62 to rotate so that the top screw 65 abuts against the lower end of the casing 1, so that the knee support plate 64 is restored to the starting position. When the driving member 42 is used, the knee lifting member 6 is disassembled, so that the driving member 42 is installed at the lower end of the casing 1, and the driving end of the driving member 42 is connected to the driving plate 43, and the driving member 42 is used to drive the pushing seat 41 to move upward.

[0070] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A presser foot lifting device for a curved arm hemming sewing machine, characterized in that: include: Housing (1); A presser foot mechanism (2), which is arranged on the housing (1) and is used to press the cloth; A transmission mechanism (3) is movably connected to the presser foot mechanism (2). A driving mechanism (4) is movably connected to the transmission mechanism (3) and drives the transmission mechanism (3) to lift the presser foot mechanism (2); Wherein, the driving mechanism (4) comprises: A push seat (41) is slidably disposed in the housing (1), and the upper end of the push seat (41) movably abuts against the push rod (31) of the transmission mechanism (3), and the lower end of the push seat (41) extends out of the housing (1); A knee-lifting member (6) is arranged at the lower end of the housing (1) and abuts against the end of a push seat (41) extending out of the lower end of the housing (1); The knee-lifting member (6) is used to drive the push seat (41) to move upward, and then cooperates with the transmission mechanism (3) to realize the presser foot lifting operation.

2. The presser foot lifting device of the curved arm hemming sewing machine according to claim 1, characterized in that: The driving mechanism (4) further comprises: a driving member 1 (42) which is used to replace the knee-lifting member (6), The driving member 1 (42) is arranged at the lower end of the housing (1), and the output end of the driving member 1 (42) is threadedly connected to a driving disk (43), and the driving disk (43) supports the end of the push seat (41) extending out of the lower end of the housing (1); The driving member 1 (42) drives the push seat (41) to move upward via the driving disk (43), and then cooperates with the transmission mechanism (3) to realize the presser foot lifting operation.

3. The presser foot lifting device of the curved arm hemming sewing machine according to claim 2, characterized in that: The knee-lifting member (6) comprises: A rotating shaft (61) rotatably disposed at the lower end of the housing (1); A swing member (62), the middle of which is rotatably mounted on the lower end of the housing (1), and the front end of the rotating shaft (61) is connected to the middle of the swing member (62), and one end of the swing member (62) movably abuts against the end of the push seat (41) extending out of the lower end of the housing (1); A swing rod (63) connected to the rear end of the rotating shaft (61); A knee support plate (64) arranged on the swing rod (63); The human knee drives the swing rod (63) to swing through the knee support plate (64), so that the rotating shaft (61) rotates, thereby driving the swing member (62) to swing, and further driving the push seat (41) to move upward.

4. The presser foot lifting device of the curved arm hemming sewing machine according to claim 3, characterized in that: One end of the swing member (62) has a mounting groove (621), and the lower end of the driving disk (43) has a mounting post (431). The mounting post (431) is inserted into the mounting groove (621) to achieve the mounting of the driving disk (43) on the swing member (62).

5. The presser foot lifting device of the curved arm hemming sewing machine according to claim 4, characterized in that: The other end of the swinging member (62) is threadedly connected with a top screw (65), and the upper end of the top screw (65) movably abuts against the lower end of the housing (1) to limit the starting position of the knee rest plate (64).

6. A presser foot lifting device for a curved arm hemming sewing machine according to any one of claims 1 to 5, characterized in that: The presser foot mechanism (2) at least comprises: A pressure rod (21) which is slidably arranged on the housing (1); A presser foot, which is arranged at the lower end of the press rod (21); A rotation limiting assembly, which is installed in the housing (1) and is used to limit the left and right swinging of the presser foot; The elastic member (23) is sleeved on the pressing rod (21) and is used to drive the pressing rod (21) to move downward so that the presser foot presses the cloth.

7. The presser foot lifting device of the curved arm hemming sewing machine according to claim 6, characterized in that: The rotation limiting assembly comprises: a limiting member 1 (22) and a limiting member 2 (12); the limiting member 1 (22) is mounted on the pressure rod (21), and a limiting block (221) is formed by protruding from the side end of the limiting member 1 (22); an opening (11) is provided on the housing (1), the opening (11) is movably connected to the limiting member 2 (12), and a limiting space (121) is formed between the limiting member 2 (12) and the opening (11); When the end of the limit block (221) extends into the opening (11), the second limit member (12) fixes the limit block (221) in the limit space (121) to limit the shaking of the pressure rod (21).

8. The presser foot lifting device of the curved arm hemming sewing machine according to claim 7, characterized in that: The presser foot mechanism (2) further comprises: The adjusting member (24) is threadedly connected to the housing (1), and the lower end of the adjusting member (24) abuts against the upper end of the elastic member (23). By adjusting the position of the adjusting member (24) on the housing (1), the force with which the presser foot presses the fabric can be adjusted.

9. The presser foot lifting device of the curved arm hemming sewing machine according to claim 8, characterized in that: The upper end of the presser foot mechanism (2) is provided with a pressurizing mechanism (5): The boosting mechanism (5) comprises: A second driving member (51) is arranged at the upper end of the housing (1); the driving end of the second driving member (51) is inserted into the through hole (241) of the adjusting member (24) and movably connected to the upper end of the pressing rod (21), so as to drive the pressing rod (21) to move downward.

10. A presser foot lifting device for a curved arm hemming sewing machine according to claim 1 or 2 or 3 or 4 or 5 or 7 or 8 or 9, characterized in that: The transmission mechanism (3) comprises: A push rod (31), the lower end of which movably abuts against the upper end of the push seat (41); A rear lever (32) is rotatably arranged on the housing (1), and the rear lever (32) is movably connected to the upper end of the push rod (31); A connecting rod (33), the rear end of which is movably connected to the rear lever (32); A front lever (34) is rotatably disposed on the housing (1), and the front lever (34) is movably connected to the front end of the connecting rod (33); A lifting member (35) is movably connected to the front lever (34), and a lifting protrusion (351) is provided at the lower end of the lifting member (35). The lifting protrusion (351) movably abuts against a pressing rod (21) of the presser foot mechanism (2) to lift the pressing rod (21).

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