Presser foot lifting and thread loosening combined transmission mechanism of flat seaming machine

Abstract

The utility model relates to the technical field of sewing machines, in particular to a presser foot lifting and thread loosening combined transmission mechanism of a flat seaming machine. Comprising a rack, and a presser foot lifting mechanism and a thread loosening mechanism are arranged on the rack. The driving mechanism is used for driving the presser foot lifting mechanism and the thread loosening mechanism; the driving mechanism comprises a driving device used for driving the presser foot lifting shaft to rotate; the thread loosening crank is fixedly mounted on the presser foot lifting shaft; the thread loosening driven crank is fixedly mounted on the thread loosening shaft; the thread loosening connecting rod is provided with a first hinge end and a second hinge end; the first hinged end is hinged to the movable end of the thread loosening crank, and the second hinged end is hinged to the movable end of the thread loosening driven crank; the thread loosening crank is located in the first working plane, and the thread loosening driven crank is located in the second working plane; the movable end of the thread loosening crank is provided with a pin shaft or a pin, and the inner diameter of the through hole of the first hinged end is larger than the outer diameter of the pin shaft or the pin, so that the first hinged end can deviate from the first working plane by a certain angle.

Description

Technical Field

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

[0002] A flat sewing machine is a special sewing machine that is mainly used to process thicker or harder materials, such as leather, plastic, etc. Since the machine hook of the flat sewing machine rotates at a larger angle, it can more easily complete the work when piercing hard materials.

[0003] The current technology has the following deficiencies:

[0004] Due to the limitation of the structure of the interlock sewing machine, the thread loosening shaft of the thread loosening mechanism and the presser foot lifting shaft of the presser foot lifting mechanism are not parallel. Therefore, when one wants to use the same power source to drive the thread loosening mechanism and the presser foot lifting mechanism, the transmission structure in the prior art is often complicated. Utility Model Content

[0005] The utility model aims to provide a presser foot lifting and thread loosening combined transmission mechanism for a flat sewing machine with a simple transmission structure, stability and reliability, so as to improve the problem that it is difficult to transmit the power on the presser foot lifting shaft to the thread loosening shaft located on another working plane.

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

[0007] A presser foot lifting and thread loosening combined transmission mechanism of a flat sewing machine comprises a frame, on which are arranged:

[0008] A presser foot lifting mechanism, which is used to lift or lower the sewing presser foot;

[0009] A thread loosening mechanism, which is used to clamp or loosen the sewing thread;

[0010] Also includes

[0011] A driving mechanism, which is used to drive the presser foot lifting shaft of the presser foot lifting mechanism and the thread loosening shaft of the thread loosening mechanism; the presser foot lifting shaft is arranged horizontally and disposed inside the crossbeam of the frame; the thread loosening shaft is arranged longitudinally and disposed inside the vertical beam of the frame; the driving mechanism comprises:

[0012] A driving device, used for driving the presser foot lifting shaft to rotate;

[0013] A thread loosening crank, which is fixedly mounted on the presser foot lifting shaft and swings along with the presser foot lifting shaft;

[0014] A wire loosening driven crank, which is fixedly mounted on the wire loosening shaft and swings along with the wire loosening shaft;

[0015] A wire release connecting rod having a first hinged end and a second hinged end; the first hinged end is hinged to the movable end of the wire release crank, and the second hinged end is hinged to the movable end of the wire release driven crank;

[0016] The wire loosening crank is located in a first working plane, the wire loosening driven crank is located in a second working plane, and the first working plane and the second working plane are perpendicular to each other;

[0017] A pin shaft or a dowel is installed on the movable end of the wire loosening crank, and the first hinged end is sleeved on the pin shaft or the dowel; the inner diameter of the through hole of the first hinged end is larger than the outer diameter of the pin shaft or the dowel, so that a certain margin is formed between the first hinged end and the pin shaft or the dowel, and the first hinged end can deviate from the first working plane by a certain angle.

[0018] Preferably, the driving mechanism comprises a driving motor;

[0019] The motor shaft of the driving motor extends upward, and a driving cam is installed on the motor shaft; a presser foot lifting crank is installed on the presser foot lifting shaft, and a steel ball is fixedly provided on the swinging end of the presser foot lifting crank; the driving cam cooperates with the spherical surface of the steel ball and pushes the presser foot lifting crank.

[0020] Preferably, the driving mechanism comprises an electromagnet; an intermediate connecting rod is hinged at the output end of the electromagnet, and the other end of the intermediate connecting rod is hinged to the movable end of the presser foot lifting crank; the presser foot lifting crank is fixedly mounted on the presser foot lifting shaft.

[0021] Preferably, the wire loosening crank, the wire loosening driven crank and the wire loosening connecting rod are all arranged inside the frame.

[0022] Preferably, the loose-wire connecting rod is a metal sheet, and the middle portion of the metal sheet is bent so that the first hinged end and the second hinged end form a vertical angle.

[0023] Compared with the prior art, the utility model has the following outstanding and beneficial technical effects:

[0024] 1. In this technical solution, two different working planes are connected by setting a bent loose-wire connecting rod and two cranks, which has a simple structure and is stable and reliable.

[0025] 2. The transmission structure is arranged inside the frame, and no additional space is required, which is convenient for upgrading and transforming the equipment currently on the market and reduces the cost of upgrading.

[0026] 3. The transmission structures in this technical solution are all located inside the frame, which can effectively avoid external pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1It is a schematic diagram of the structure of the utility model after removing part of the frame.

[0028] Figure 2 It is a structural diagram of the first embodiment of the present utility model.

[0029] Figure 3 It is a cross-sectional view of the movable end of the first hinged end of the loose-wire connecting rod of the utility model.

[0030] Figure 4 It is a structural diagram of the second embodiment of the present utility model.

[0031] Reference numerals:

[0032] 1. Frame;

[0033] 2. Presser foot lifting mechanism; 21. Presser foot lifting shaft; 22. Presser foot lifting crank; 23. Steel ball; 24. Presser foot lifting shaft sleeve; 25. Presser foot lifting hanging plate; 26. Press rod assembly;

[0034] 3. Wire loosening mechanism; 31. Wire loosening shaft; 32. Wire loosening crank; 33. Wire loosening driven crank; 34. Wire loosening connecting rod; 341. First hinged end; 342. Second hinged end; 343. Angle; 344. Pin; 345. Through hole;

[0035] 4. Driving mechanism; 41. Driving motor; 42. Motor shaft; 43. Driving cam; 431. Initial state segment; 432. Driving curved surface segment; 44. Electromagnet; 45. Intermediate connecting rod. DETAILED DESCRIPTION

[0036] The following are specific embodiments of the present invention, and the technical solution of the present invention is further described in conjunction with the accompanying drawings, but the present invention is not limited to these embodiments.

[0037] Embodiment 1:

[0038] like Figure 1-Figure 3 The presser foot lifting and thread loosening combined transmission mechanism of a flat sewing machine shown in the figure comprises a frame 1, on which are arranged:

[0039] A presser foot lifting mechanism 2, which is used to lift or lower the sewing presser foot;

[0040] The thread loosening mechanism 3 is used for clamping or loosening the sewing thread.

[0041] Also includes

[0042] The driving mechanism 4 is used to drive the presser foot lifting shaft 21 of the presser foot lifting mechanism 2, and drive the thread loosening shaft 31 of the thread loosening mechanism 3; the presser foot lifting shaft 21 is arranged horizontally and set inside the crossbeam of the frame 1; the thread loosening shaft 31 is arranged longitudinally and set inside the vertical beam of the frame 1.

[0043] In this technical solution, the driving mechanism 4 includes:

[0044] A driving device, which is used to drive the presser foot lifting shaft 21 to rotate;

[0045] A thread loosening crank 32, which is fixedly mounted on the presser foot lifting shaft 21 and swings along with the presser foot lifting shaft 21;

[0046] A wire loosening driven crank 33, which is fixedly mounted on the wire loosening shaft 31 and swings along with the wire loosening shaft 31;

[0047] The wire loosening connecting rod 34 has a first hinged end 341 and a second hinged end 342 ; the first hinged end 341 is hinged to the movable end of the wire loosening crank 32 , and the second hinged end 342 is hinged to the movable end of the wire loosening driven crank 33 .

[0048] The wire loosening crank 32 is located in a first working plane, and the wire loosening driven crank 33 is located in a second working plane.

[0049] It should be noted that when the thread loosening crank 32 rotates around the presser foot lifting shaft 21, the plane on which the thread loosening crank 32 rotates is the first working plane;

[0050] When the wire loosening driven crank 33 rotates around the wire loosening shaft 31 , the plane on which the wire loosening driven crank 33 rotates is the second working plane.

[0051] Due to the structural limitation of the interlock sewing machine, the presser foot lifting shaft 21 of the presser foot lifting mechanism 2 and the thread loosening shaft 31 of the thread loosening mechanism 3 are often not parallel, so it is cumbersome to transfer power from one shaft to the other shaft. The presser foot lifting shaft 21 is perpendicular to the first working plane, and the thread loosening shaft 31 is perpendicular to the second working plane, so the first working plane and the second working plane are two intersecting planes in space.

[0052] In the present technical solution, a through hole 345 is formed on the movable end of the loosening crank 32, and a pin shaft or a pin 344 is installed in the through hole 345. In the present embodiment, a pin is used. The first hinged end 341 is sleeved on the pin 344; the inner diameter of the through hole 345 of the first hinged end 341 is larger than the outer diameter of the pin shaft or the pin 344, so that a certain margin is formed between the first hinged end 341 and the pin 344, and the first hinged end 341 can deviate from the first working plane by a certain angle.

[0053] When the wire loosening crank 32 or the wire loosening driven crank 33 rotates, the wire loosening connecting rod 34 can drive the wire loosening driven crank 33 or the wire loosening crank 32 to rotate, thereby realizing power transmission between the presser foot lifting shaft 21 and the wire loosening shaft 31.

[0054] The wire loosening crank 32 and the wire loosening driven crank 33 do not rotate on the same plane when rotating. When the upper and lower ends of the wire loosening connecting rod 34 rotate along two different working planes, the design of the margin allows a high degree of freedom between the first hinged end 341 and the wire loosening crank 32. Under the condition of ensuring the degree of freedom, the first hinged end 341 can realize transmission and cannot be separated from the wire loosening crank 32, and at the same time, the wire loosening connecting rod 34 is prevented from being squeezed, thereby causing damage to the parts.

[0055] The loosening connecting rod 34 is a metal sheet, and the middle part of the metal sheet is bent so that the first hinge end 341 and the second hinge end 342 form a vertical angle 343. Of course, the loosening connecting rod 34 can also be cast into a metal rod. Relatively speaking, when the loosening connecting rod 34 is a metal sheet, its weight is lighter, it is easy to transmit, and it can be slightly bent to a certain extent, which is more conducive to automatic correction of transmission.

[0056] like Figure 1-Figure 3 As shown, the driving device is a driving motor 41;

[0057] The motor shaft 42 of the driving motor 41 extends upward, and a driving cam 43 is installed on the motor shaft 42; a presser foot lifting crank 22 is installed on the presser foot lifting shaft 21, and a steel ball 23 is fixedly set on the swinging end of the presser foot lifting crank 22; the circumferential side curved surface of the driving cam 43 cooperates with the spherical surface of the steel ball 23 and pushes the presser foot lifting crank 22.

[0058] The curved surface around the driving cam 43 is formed with an initial state segment 431 and a driving curved surface segment 432. The radius of each point on the initial state segment 431 is the same, and the distance from each point on the curved surface to the axis of the motor shaft 42 is the shortest; while the radius of the driving curved surface segment 432 gradually increases.

[0059] Under the action of gravity, the steel ball 23 will fit on the peripheral side of the driving cam 43 . When the steel ball 23 is located in the initial state section 431 , its position will not change.

[0060] When the steel ball 23 enters the driving curved surface section 432 , it will be pushed by the driving curved surface section 432 to move away from the motor shaft 42 . Because the steel ball 23 is fixedly set on the presser foot lifting crank 22 , it will drive the presser foot lifting shaft 21 to rotate through the presser foot lifting crank 22 .

[0061] After the steel ball 23 passes through the driving curved surface section 432 , it will enter the initial state section 431 again and repeat the above process to complete the driving.

[0062] A presser foot lifting shaft sleeve 24 is also sleeved on the presser foot lifting shaft 21, and the presser foot lifting shaft sleeve 24 is fitted to the end of the presser foot lifting crank 22 to limit the movement of the presser foot lifting crank 22 on the presser foot lifting shaft 21, so that the contact state between the steel ball 23 and the driving cam 43 remains stable.

[0063] One end of the presser foot lifting shaft 21 is connected to a pressure rod assembly 26 via a presser foot lifting suspension plate 25 , and the sewing presser foot is lifted or lowered via the pressure rod assembly 26 .

[0064] The technical solution has a simple structure, is stable and reliable, and is easy to assemble, so that the wire loosening crank 32, the wire loosening driven crank 33 and the wire loosening connecting rod 34 can all be arranged inside the frame 1 without requiring additional space, thus facilitating the upgrading and transformation of existing equipment.

[0065] Embodiment 2:

[0066] Specific as Figure 4 As shown, in this embodiment, the driving mechanism 4 includes an electromagnet 44; the output end of the electromagnet 44 is hinged with an intermediate connecting rod 45, and the other end of the intermediate connecting rod 45 is hinged to the movable end of the presser foot lifting crank 22; the presser foot lifting crank 22 is fixedly mounted on the presser foot lifting shaft 21.

[0067] When the electromagnet 44 performs reciprocating linear motion, it drives the presser foot lifting shaft 21 to rotate through the intermediate connecting rod 45 .

[0068] As a preferred technical solution, the driving mechanism 4 can also be driven by a cylinder, a lead screw or the like.

[0069] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A presser foot lifting and thread loosening combined transmission mechanism of a flat sewing machine, comprising a frame (1), on which are arranged: A presser foot lifting mechanism (2), which is used to lift or lower the sewing presser foot; A thread loosening mechanism (3), which is used to clamp or loosen the sewing thread; It is characterized in that Also includes A driving mechanism (4) for driving a presser foot lifting shaft (21) of the presser foot lifting mechanism (2) and a thread loosening shaft (31) of the thread loosening mechanism (3); the presser foot lifting shaft (21) is arranged transversely and disposed inside a crossbeam of the frame (1); the thread loosening shaft (31) is arranged longitudinally and disposed inside a vertical beam of the frame (1); The driving mechanism (4) comprises: A driving device, used for driving the presser foot lifting shaft (21) to rotate; A wire loosening crank (32) which is fixedly mounted on the presser foot lifting shaft (21) and swings along with the presser foot lifting shaft (21); A wire loosening driven crank (33) which is fixedly mounted on the wire loosening shaft (31) and swings along with the wire loosening shaft (31); A wire loosening connecting rod (34) having a first hinged end (341) and a second hinged end (342); the first hinged end (341) is hinged to the movable end of the wire loosening crank (32), and the second hinged end (342) is hinged to the movable end of the wire loosening driven crank (33); The wire loosening crank (32) is located in a first working plane, and the wire loosening driven crank (33) is located in a second working plane, and the first working plane and the second working plane are perpendicular to each other; A pin shaft or a pin (344) is installed on the movable end of the wire loosening crank (32), and the first hinged end (341) is sleeved on the pin shaft or the pin (344); the inner diameter of the through hole (345) of the first hinged end (341) is larger than the outer diameter of the pin shaft or the pin (344), so that a certain margin is formed between the first hinged end (341) and the pin shaft or the pin (344), and the first hinged end (341) can deviate from the first working plane by a certain angle.

2. The presser foot lifting and thread loosening combined transmission mechanism of a flat sewing machine according to claim 1, characterized in that: The driving device is a driving motor (41); The motor shaft (42) of the driving motor (41) extends upward, and a driving cam (43) is installed on the motor shaft (42); a presser foot lifting crank (22) is installed on the presser foot lifting shaft (21), and a steel ball (23) is fixedly arranged on the swing end of the presser foot lifting crank (22); the driving cam (43) cooperates with the spherical surface of the steel ball (23) and pushes the presser foot lifting crank (22).

3. The presser foot lifting and thread loosening combined transmission mechanism of a flat sewing machine according to claim 1, characterized in that: The driving mechanism (4) comprises an electromagnet (44); an intermediate connecting rod (45) is hingedly connected to the output end of the electromagnet (44); the other end of the intermediate connecting rod (45) is hingedly connected to the movable end of a presser foot lifting crank (22); the presser foot lifting crank (22) is fixedly mounted on the presser foot lifting shaft (21).

4. The presser foot lifting and thread loosening combined transmission mechanism of a flat sewing machine according to claim 1, characterized in that: The wire loosening crank (32), the wire loosening driven crank (33), and the wire loosening connecting rod (34) are all arranged inside the frame (1).

5. The presser foot lifting and thread loosening combined transmission mechanism of a flat sewing machine according to claim 1, characterized in that: The loosening connecting rod (34) is a metal sheet, and the middle part of the metal sheet is bent so that the first hinge end (341) and the second hinge end (342) form a vertical angle (343).

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