Bird nest prevention device and sewing machine

Abstract

The present invention discloses an anti-bird nest device and a sewing machine containing the device. The purpose of the present invention is achieved as follows: an anti-bird nest device comprises a bracket, which is used to be fixed on the housing of the sewing machine, and also comprises a lifting plate, a thread hooking and air suction assembly; a swing rod, which is rotatably mounted on the bracket; a driving mechanism, which is mounted on the bracket and drives the swing rod to rotate; one end of the swing rod is hinged with a first connecting rod assembly, and the first connecting rod assembly drives the lifting plate to move up and down; the other end of the swing rod is hinged with a second connecting rod assembly, and the second connecting rod assembly connects the thread hooking rod of the thread hooking and air suction assembly; when the lifting plate moves downward, the front end of the thread hooking rod extends toward the presser foot of the sewing machine; when the lifting plate moves upward, the front end of the thread hooking rod retracts and hooks the thread. This anti-bird nest device can realize the extension and retraction of the thread hooking rod and the overall movement of the thread hooking and air suction assembly by using a driving mechanism. In addition, the operation space can be increased by the overall movement of the thread hooking and air suction assembly.

Description

Technical Field

[0001] The invention belongs to the technical field of sewing machines, in particular to an anti-bird nest device and a sewing machine containing the device. Background Art

[0002] At present, with the improvement of sewing effect, an anti-bird nest device has emerged. The device can reduce the situation that the upper thread remains on the presser foot surface when the flat sewing machine starts sewing, and the lower thread at the beginning of sewing will be tangled.

[0003] However, the existing anti-bird nest device uses a cylinder to extend and retract the hook rod. For example, patent No. 2017216091457 specifically discloses a structural type of an anti-bird nest device. However, in actual use, in order to give operators more space, in addition to extending and retracting the hook rod, the movement of the hook and suction components is also required. By moving the hook and suction components, there is more space for fingers to feed the cloth.

[0004] However, if a driving mechanism is directly added to independently control the movement of the line hooking and air suction components, it will not only cause interference between the two actions but also lead to an increase in product prices. Summary of the invention

[0005] The object of the present invention is to provide a bird nest prevention device and a sewing machine comprising the device. The bird nest prevention device can realize the extension and retraction of the thread hooking rod and the overall movement of the thread hooking and air suction components by using a driving mechanism.

[0006] The object of the present invention is achieved as follows: an anti-bird nest device, comprising a bracket, which is used to be fixed on the housing of a sewing machine, and also comprising

[0007] A lifting plate, which is installed on the bracket and can be lifted up and down;

[0008] A thread hooking and suction assembly is mounted on the lifting plate and is used to hook and suck away the sewing thread at the presser foot;

[0009] A swing rod, which is rotatably mounted on a bracket;

[0010] A driving mechanism, which is mounted on the bracket and drives the swing rod to rotate;

[0011] One end of the swing rod is hinged with a first connecting rod assembly, and the first connecting rod assembly drives the lifting plate to move up and down;

[0012] The other end of the swing rod is hinged with a second connecting rod assembly, and the second connecting rod assembly is connected to the tail end of the hooking rod of the hooking and suction assembly;

[0013] When the lifting plate moves downward, the front end of the thread hooking rod extends toward the presser foot of the sewing machine;

[0014] When the lifting plate moves upward, the front end of the thread hooking rod retracts and hooks the thread;

[0015] The lower end of the first connecting rod assembly is hinged to the lifting plate through a fastener.

[0016] Preferably, the driving mechanism is a rotating electromagnet or a rotating cylinder.

[0017] Preferably, a slide groove is formed on one side of the lifting plate, and a plurality of fasteners are arranged in the slide groove. Each of the fasteners passes through the slide groove and is connected to the bracket, thereby realizing the up and down lifting of the lifting plate.

[0018] Preferably, the second connecting rod assembly comprises a vertical connecting rod, a curved connecting rod and a diagonal tie rod which are sequentially connected end to end;

[0019] One end of the vertical connecting rod is hinged to the other end of the swing rod;

[0020] The bent connecting rod is rotatably mounted on the bracket, and the two ends of the rotating fulcrum of the bent connecting rod are respectively hinged with a vertical connecting rod and a diagonal tie rod;

[0021] One end of the inclined tie rod is connected to the tail end of the line hooking rod.

[0022] Preferably, a crank is provided between the wire hooking rod and the inclined rod, a mounting hole is formed at the upper end of the crank, and the mounting hole is connected to the wire hooking rod by a fastener;

[0023] A pin is formed on the side of the crank, and the inclined tie rod is sleeved on the outside of the pin;

[0024] The pin shaft is perpendicular to the mounting hole.

[0025] Preferably, a hook spring shaft is provided at the lower end of the lifting plate, a hook spring petal is extended and formed on the upper side of the bracket, and a spring is connected between the hook spring petal and the hook spring shaft.

[0026] Preferably, a limiting plate is provided at the lower end of the bracket, and one side of the limiting plate is connected to the lifting plate.

[0027] A sewing machine comprises the anti-bird nest device described in any one of the above items.

[0028] Compared with the prior art, the present invention has the following outstanding and beneficial technical effects:

[0029] 1. Compared with the prior art, the present invention can realize the movement of the thread hooking rod and the thread hooking and air suction assembly through a single driving mechanism. Therefore, such a structural design not only increases the cost because no new driving mechanism is added, but also does not cause interference between the extension and retraction of the thread hooking rod and the overall movement of the thread hooking and air suction assembly.

[0030] 2. In addition, when the thread hook rod is extended or retracted, the overall movement of the thread hook and air suction components can also provide the operator with a larger operating space, making it easier for the operator to feed the cloth with his fingers. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is one of the structural diagrams of the present invention;

[0032] Figure 2 This is the second structural diagram of the present invention;

[0033] Figure 3 It is one of the structural diagrams of the anti-bird nest mechanism;

[0034] Figure 4 This is the second structural diagram of the anti-bird nest mechanism;

[0035] Figure 5 This is the third structural diagram of the anti-bird nest mechanism;

[0036] Figure 6 It is an exploded diagram of the connection between the hook rod and the diagonal tie rod.

[0037] In the figure: 1-presser foot rod; 2-fastener; 3-lifting plate; 4-slide; 5-driving mechanism; 6-bracket; 7-rocker; 8-first connecting rod assembly; 9-oblique tie rod; 10-bent connecting rod; 11-vertical connecting rod; 12-thread hooking rod; 13-thread hooking and suction assembly; 14-crank; 15-presser foot; 16-spring; 17-limiting plate; 18-protective cover; 19-circlip; 31-hook spring shaft; 51-driving shaft; 61-hook spring petal; 100-housing; 141-mounting hole; 142-pin shaft; 200-anti-bird nest device; 300-bottom plate; 400-second connecting rod assembly. DETAILED DESCRIPTION

[0038] The present invention is further described below with reference to specific embodiments.

[0039] Embodiment 1: This embodiment specifically discloses a structure of a sewing machine, such as Figure 1 As shown, the sewing machine at least includes a housing 100, a bottom plate 300 and an anti-bird nest device 200; a presser foot rod 1 and a presser foot 15 arranged on the bottom plate 300 are arranged in the housing 100.

[0040] like Figure 1-5 As shown, the bird nest prevention device 200 described in this embodiment is installed near the presser foot rod 1 and the presser foot 15. Figure 1 and Figure 2 The bird nest prevention device 200 further includes a protective cover 18 , which is used to reduce dust or cloth scraps from entering the bird nest prevention device 200 .

[0041] Next, the internal structure of the anti-bird nest device is introduced in detail:

[0042] like Figure 3 As shown, a bird nest prevention device includes a bracket 6, which is used to be fixed on the housing 100 of the sewing machine and is also used to connect other components such as a driving mechanism 5; and

[0043] A lifting plate 3, which is mounted on the bracket 6 and can be lifted up and down;

[0044] The thread hooking and air suction component 13 is installed on the lifting plate 3 and is used to hook and suck away the sewing thread at the presser foot 15; preferably, in this embodiment, the thread hooking and air suction component 13 and the lifting plate 3 are integrally formed, thereby increasing the strength of the parts and improving the service life of the product.

[0045] A swing rod 7, which is rotatably mounted on the bracket 6;

[0046] The driving mechanism 5 is installed on the bracket 6 and drives the swing rod 7 to rotate. In this embodiment, a driving shaft 51 is provided at one end of the driving mechanism 5, and the driving shaft 51 passes through the swing rod 7 to drive the swing rod 7 to rotate.

[0047] One end of the swing rod 7 is hinged with a first connecting rod assembly 8, and the first connecting rod assembly 8 drives the lifting plate 3 to move up and down;

[0048] The other end of the swing rod 7 is hinged with a second connecting rod assembly 400, and the second connecting rod assembly is connected to the tail end of the thread hooking rod 12 of the thread hooking and air suction assembly 13;

[0049] Therefore, in this embodiment, the driving shaft 51 serves as a rotating fulcrum, and the first connecting rod assembly 8 and the second connecting rod assembly 400 are respectively arranged on both sides of the driving shaft 51 to form a lever structure, so that the lifting plate 3 can be driven up and down and the wire hooking rod 12 can be driven through a driving mechanism 5.

[0050] Therefore, if Figure 4 As shown, when the lifting plate 3 moves downward, the front end of the thread hooking rod 12 extends toward the presser foot 15 of the sewing machine;

[0051] When the lifting plate 3 moves upward, the front end of the thread hooking rod 12 retracts and hooks the thread.

[0052] Therefore, in this embodiment, the movement of the thread hooking rod 12 and the thread hooking and air suction assembly 13 is realized by a driving mechanism 5. Not only does it not increase the cost, but it can also drive the movement of the lifting plate 3 after each operation of the thread hooking rod 12. The movement of the lifting plate 3 drives the overall movement of the thread hooking and air suction assembly 13. The overall movement of the thread hooking and air suction assembly 13 can provide a larger operating space for the operator and improve work efficiency.

[0053] Preferably, the driving mechanism 5 is a rotating electromagnet or a rotating cylinder. Both of the above products are mature products on the market, easy to purchase, low cost and stable performance. Therefore, the corresponding driving shaft 51 is the rotating shaft on the electromagnet or the cylinder.

[0054] Preferably, the lower end of the first connecting rod assembly 8 is hinged to the lifting plate 3 through an axial screw. A slide groove 4 is formed on one side of the lifting plate 3, and a plurality of fasteners 2 are arranged in the slide groove 4. Each fastener 2 passes through the slide groove 4 and is connected to the bracket 6, thereby realizing the lifting and lowering of the lifting plate 3.

[0055] The above specifically describes the technical solution of the first connecting rod assembly 8 driving the lifting plate 3 to move up and down. The first connecting rod assembly 8 is hinged to the lifting plate 3, and the swing rod 7 is hinged to the first connecting rod assembly 8, so that the swing of the swing rod 7 can be converted into the up and down movement of the lifting plate 3.

[0056] At the same time, by arranging the fasteners 2 in the slide groove 4, the trajectory of the lifting plate 3 can be limited. In addition, in this embodiment, preferably, the number of the fasteners 2 is two, and a "straight line" is determined by the two fasteners, and this "straight line" is the trajectory of the lifting plate 3 moving up and down. Such a design can ensure that the up and down lifting trajectory of the lifting plate 3 can follow the trajectory arranged by the fasteners 2, so that the trajectory of the lifting plate 3 moving up and down can be more controllable.

[0057] Next, the structure of the second connecting rod assembly 400 driving the thread hooking rod 12 to move is described in detail:

[0058] Preferably, if Figure 4 As shown, the second connecting rod assembly 400 includes a vertical connecting rod 11, a curved connecting rod 10 and a diagonal tie rod 9 which are sequentially connected end to end;

[0059] One end of the vertical link 11 is hinged to the other end of the swing rod 7. Figure 4 As shown, the vertical connecting rod 11 is hinged to the right end of the swing rod 7 through a fastener; the lower end of the vertical connecting rod 11 is hinged to the curved connecting rod 10.

[0060] The bent link 10 is rotatably mounted on the bracket 6, and the two ends of the bent link 10 at its rotation fulcrum are respectively hinged with a vertical link 11 and a diagonal tie rod 9; Figure 4 As shown, such a design can form a "lever" structure, thereby converting the up and down movement of the vertical connecting rod 11 into the left and right swing of the diagonal tie rod 9, so that the end of the diagonal tie rod 9 can be connected to the tail end of the hooking rod 12, thereby realizing the extension and retraction of the hooking rod 12.

[0061] In this embodiment, the rotation fulcrum of the bent link 10 is the position where the axial screw 18 is located. The position where the axial screw 18 is located is exactly the turning point of the bent link 10. Figure 4 As shown, the shape of the bent link 10 is "L-shaped" as a whole. In particular, the horizontal short side end of the bent link 10 is hinged to the vertical link 11, and the vertical long side end of the bent link 10 is hinged to the diagonal tie rod 9. In addition, in the embodiment, the angle between the long side and the short side of the bent link 10 is an obtuse angle. The axial screw 18 passes through the bent link 10 and is connected to the bracket 6.

[0062] In addition, Figure 3 As shown, the bent connecting rod 10 is further formed with a bent portion bent outward on its long side, so as to reserve space for facilitating the connection between the diagonal tie rod 9 and the hooking rod 12 .

[0063] like Figure 6 As shown, preferably, a crank 14 is provided between the wire hooking rod 12 and the inclined rod 9, and a mounting hole 141 is formed on the upper end of the crank 14, and the mounting hole 141 is connected to the wire hooking rod 12 by a fastener;

[0064] The crank 14 is formed with a pin 142 on its side, and the inclined tie rod 9 is sleeved on the outside of the pin 142;

[0065] The pin shaft 142 is perpendicular to the mounting hole 141 .

[0066] In this embodiment, the inclined rod 9 and the hooking rod 12 are both in the shape of a plate. In actual use, the inclined rod 9 and the hooking rod 12 are at a vertical angle, and the conventional axial screw cannot solve the articulation problem between the two. Therefore, the design of the pin 142 in the crank 14 being perpendicular to the mounting hole 141 can solve the above technical problem and realize power transmission in two vertical directions.

[0067] The pin shaft 142 and the mounting hole 141 being perpendicular to each other in this embodiment refers to the perpendicularity between the axis of the pin shaft 142 and the axis of the mounting hole 141 .

[0068] At the same time, in order to increase the tightness of the connection between the pin shaft 142 and the inclined rod 9, the clamping spring 19 is also used to abut against the end surface of the inclined rod 9 and clamp the clamping groove on the pin shaft 142 at the same time.

[0069] like Figure 5 As shown, preferably, a hook spring shaft 31 is provided at the lower end of the lifting plate 3 , a hook spring petal 61 is extended and formed on the upper side of the bracket 6 , and a spring 16 is connected between the hook spring petal 61 and the hook spring shaft 31 .

[0070] The above specifically discloses a technical solution that can assist the lifting plate 3 in achieving reset. Further, the hook spring shaft 31 is integrally formed with the lifting plate 3 and the hook spring shaft 31 extends toward the bracket 6. At the same time, the hook spring petal 61 is arranged on the same side as the hook spring shaft 31, so that the connecting rod mechanism on the other side of the lifting plate 3 can be avoided and the space can be fully utilized.

[0071] It should be noted that, in this embodiment, the bracket 6 is fixed on the housing 100 and does not move with the movement of the lifting plate 3 .

[0072] like Figure 5 As shown, preferably, a limit plate 17 is provided at the lower end of the bracket 6, and one side of the limit plate 17 is connected to the lifting plate 3. The function of the limit plate 17 is to limit the lifting plate 3 when it moves to a set limit position by abutting against the lower end of the bracket 6.

[0073] At the same time, as a preferred technical solution, Figure 5 As shown, a groove is formed at the lower end of the limiting plate 17, and the size of the groove is adapted to the size of the hook spring shaft 31, so that the position of the hook spring shaft 31 can coincide with the position of the limiting plate 17, thereby saving space.

[0074] The limiting plate 17 is fixedly connected to the lifting plate 3 by fastening pieces arranged on both sides thereof. Such a connection method is simple, effective and stable.

[0075] 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 bird nest prevention device, comprising a bracket (6) for fixing on a housing (100) of a sewing machine, characterized in that: Also includes A lifting plate (3) which is mounted on the bracket (6) and can be lifted up and down; A thread hooking and suction assembly (13), which is mounted on the lifting plate (3) and is used to hook and suck away the sewing thread at the presser foot (15); A swing rod (7) rotatably mounted on the bracket (6); A driving mechanism (5) mounted on the bracket (6) and driving the swing rod (7) to rotate; One end of the swing rod (7) is hingedly connected to a first connecting rod assembly (8), and the first connecting rod assembly (8) drives the lifting plate to move up and down; The other end of the swing rod (7) is hinged with a second connecting rod assembly (400), and the second connecting rod assembly is connected to the tail end of the thread hooking rod (12) of the thread hooking and air suction assembly (13); When the lifting plate (3) moves downward, the front end of the thread hooking rod (12) extends toward the presser foot (15) of the sewing machine; When the lifting plate (3) moves upward, the front end of the thread hooking rod (12) retracts and hooks the thread; The lower end of the first connecting rod assembly (8) is hinged to the lifting plate (3) via a fastener; The driving mechanism (5) is a rotating electromagnet or a rotating cylinder.

2. The bird nest prevention device according to claim 1, characterized in that: A slide groove (4) is formed on one side of the lifting plate (3), and a plurality of fasteners (2) are arranged in the slide groove (4). Each fastener (2) passes through the slide groove (4) and is connected to the bracket (6), thereby achieving the lifting and lowering of the lifting plate (3).

3. The bird nest prevention device according to claim 1, characterized in that: The second connecting rod assembly (400) comprises a vertical connecting rod (11), a curved connecting rod (10) and a diagonal tie rod (9) which are sequentially connected end to end; One end of the vertical connecting rod (11) is hinged to the other end of the swing rod (7); The bent connecting rod (10) is rotatably mounted on the bracket (6), and the bent connecting rod (10) is hingedly connected to a vertical connecting rod (11) and a diagonal tie rod (9) at both ends of its rotation fulcrum. One end of the inclined tie rod (9) is connected to the tail end of the line hook rod (12).

4. The bird nest prevention device according to claim 3, characterized in that: A crank (14) is provided between the wire hooking rod (12) and the inclined rod (9), a mounting hole (141) is formed on the upper end of the crank (14), and the mounting hole (141) is connected to the wire hooking rod (12) via a fastener; A pin shaft (142) is formed on the side surface of the crank (14), and the inclined tie rod (9) is sleeved on the outside of the pin shaft (142); The pin shaft (142) is perpendicular to the mounting hole (141).

5. The bird nest prevention device according to claim 1, characterized in that: A hook spring shaft (31) is provided at the lower end of the lifting plate (3), a hook spring petal (61) is extended and formed on the upper side of the bracket (6), and a spring (16) is connected between the hook spring petal (61) and the hook spring shaft (31).

6. The bird nest prevention device according to claim 1 or 5, characterized in that: A limiting plate (17) is provided at the lower end of the bracket (6), and one side of the limiting plate (17) is connected to the lifting plate (3).

7. A sewing machine, characterized in that: The invention comprises the anti-bird nest device according to any one of claims 1 to 6.

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