Feeding mechanism and overedger

Abstract

The invention relates to the technical field of sewing machines, in particular to a feeding mechanism and an overedger, and the feeding mechanism comprises a main shaft used for outputting rotating force; the feed lifting assembly is used for converting the rotating force into linear motion in a first direction; the cloth feeding assembly is used for converting the rotating force into linear motion in a second direction, and the cloth feeding assembly comprises a cloth feeding eccentric wheel locked on the main shaft; the feed rack assembly is driven by the feed lifting assembly and the cloth feeding assembly to linearly move in the first direction and the second direction; the tooth assembly is mounted on the tooth frame assembly and is driven by the tooth frame assembly to move; wherein the main shaft is configured with a first initial position and a second initial position rotating by a specific angle relative to the first initial position; the main shaft is switched between the first initial position and the second initial position, and the main shaft rotates by a specific angle relative to the cloth feeding eccentric wheel. By the adoption of the feeding mechanism, operation is convenient, the spindle and the feeding connecting rod assembly do not need to be replaced, and the switching speed is increased.

Description

Technical Field

[0001] The present application relates to the technical field of sewing machines, and in particular to a feeding mechanism and an overlock sewing machine. Background Art

[0002] When solving the sewing needs of different fabrics, the technical solution adopted by the overlock sewing machine in the prior art is to change the deflection angle of the feeding trajectory of the tooth assembly in the coordinate system. In this solution, the position of the needle plate is always in a horizontal position, and the angle between the needle plate and the axis of the needle is always an acute angle. In this way, the needle penetrates the fabric at an angle when piercing the material. When it is sewing thicker or harder textiles, the needle is prone to bend or even break. Summary of the invention

[0003] Based on this, it is necessary to provide a feeding mechanism that can switch the deflection angle of the coordinate system of the feeding trajectory according to different sewing material requirements.

[0004] In order to solve the above technical problems, the present application provides the following technical solutions: a feeding mechanism, comprising:

[0005] A main shaft, used for outputting rotational force;

[0006] A tooth lifting assembly, used for converting the rotational force into a linear motion in a first direction;

[0007] A cloth feeding assembly, used for converting the rotational force into a linear motion in a second direction, the cloth feeding assembly comprising a cloth feeding eccentric wheel locked on the main shaft;

[0008] A tooth frame assembly, wherein the tooth frame assembly is driven by the tooth lifting assembly and the cloth feeding assembly to realize linear motion in a first direction and a second direction; and

[0009] A tooth component, the tooth component is mounted on the tooth frame component and is driven to move by the tooth frame component;

[0010] Wherein, the spindle is configured with a first starting position and a second starting position rotated by a specific angle compared with the first starting position; the spindle switches between the first starting position and the second starting position, and the spindle rotates by the specific angle compared with the feed eccentric wheel.

[0011] It is understandable that, since the spindle is configured with a first starting position and a second starting position, the spindle can be rotated and switched at different positions according to needs. When it switches between the first starting position and the second starting position, the coordinate system of the feeding track of the tooth assembly will be deflected accordingly, so that the feeding track of the tooth assembly can adapt to needle plates with different tilt heights. Since the above effect can be achieved by simply rotating the spindle by a specific angle relative to the feed eccentric wheel, it is easy to operate without replacing the spindle and the feed connecting rod assembly, which helps to increase the switching speed.

[0012] In one embodiment, when the spindle is in the first starting position, the tooth component is driven by the tooth rack component to move to form a first feeding trajectory; when the spindle is in the second starting position, the tooth component is driven by the tooth rack component to move to form a second feeding trajectory; the first feeding trajectory and the second feeding trajectory have the same shape.

[0013] It can be understood that by setting the first feeding track and the second feeding track to be the same, there is no need to replace the cloth feeding assembly. In this way, the present application can meet the sewing needs of materials of different thicknesses by relying only on the rotating main shaft, which helps to simplify the overall structure.

[0014] In one embodiment, the cloth feeding eccentric wheel is locked on the main shaft by a locking piece, and a first locking portion and a second locking portion are formed on the main shaft; when the main shaft is in the first starting position, the locking piece cooperates with the first locking portion; when the main shaft is in the second starting position, the locking piece cooperates with the second locking portion.

[0015] It can be understood that by setting the first locking portion, the second locking portion and the locking piece that cooperates with the first locking portion and the second locking portion, locking between the main shaft and the cloth feeding eccentric wheel can be easily achieved.

[0016] In one embodiment, the locking member is a bolt, and a bolt hole for mating with the bolt thread is formed on the cloth feeding eccentric wheel.

[0017] It can be understood that by using a bolt to abut against the first locking portion or the second locking portion to achieve locking between the cloth feeding eccentric wheel and the main shaft, the locking structure is simplified and easy to implement.

[0018] In one embodiment, the first locking portion and the second locking portion are turned surfaces formed on the main shaft.

[0019] It can be understood that by arranging the first locking portion and the second locking portion as turned surfaces, the locking strength can be improved.

[0020] In one embodiment, the locking member includes a first bolt cooperating with the first locking portion and a second bolt cooperating with the second locking portion, and the difference between the degree of the angle formed by the axis of the first bolt and the axis of the second bolt and the degree of the specific angle is n*90°, n≥2.

[0021] In this way, the area of ​​the turned surface can be increased, the locking force can be improved, and the process difficulty can be reduced.

[0022] In one of the embodiments, an auxiliary locking member is provided between the cloth feeding eccentric wheel and the main shaft.

[0023] Thus, the locking strength can be further improved by combining the auxiliary locking element.

[0024] In one embodiment, the auxiliary locking member is a bolt for cooperating with the thread of the cloth feeding eccentric wheel.

[0025] It can be understood that setting the auxiliary locking member as a bolt simplifies the locking structure and facilitates implementation.

[0026] In one embodiment, the auxiliary locking member includes a third bolt and a fourth bolt; wherein, when the first bolt cooperates with the first locking portion, the fourth bolt is locked on the main shaft; when the second bolt cooperates with the second locking portion, the third bolt is locked on the main shaft; the axis of the first bolt is perpendicular to the axis of the fourth bolt, and the axis of the second bolt is perpendicular to the axis of the third bolt.

[0027] It can be understood that by setting the axes of the first bolt and the third bolt to be vertical and the axes of the second bolt and the fourth bolt to be vertical, when the first bolt, the third bolt, or the second bolt, the fourth bolt locks the feed eccentric wheel to the main shaft, it helps to increase the locking force between the feed eccentric wheel and the main shaft to avoid slipping.

[0028] The present application also provides the following technical solution: a serger, comprising a machine base, a needle plate arranged on the machine base, a needle located above the needle plate, and the aforementioned feeding mechanism; the needle plate is configured with a first matching position and a second matching position that form different angles with the axis of the needle; the degree of the angle formed by the needle plate between the first matching position and the second matching position is equal to the degree of the specific angle rotated by the main shaft.

[0029] It can be understood that by configuring the needle plate to switch between the first matching position and the second matching position so as to form different angles with the axis of the needle, different sewing requirements can be met. The main shaft is configured to rotate relative to the feed eccentric wheel so that the feeding trajectory of the tooth assembly can match needle plates with different inclination heights. In this way, the overlock machine can meet different sewing requirements while increasing the switching speed and making it more convenient to operate.

[0030] Compared with the prior art, the feeding mechanism of the present application is configured with a first starting position and a second starting position on the main shaft, so that the main shaft can be rotated and switched at different positions according to needs. When it switches between the first starting position and the second starting position, the coordinate system of the feeding track of the tooth assembly will be deflected accordingly, so that the feeding track of the tooth assembly can adapt to needle plates with different tilt heights. Since the above effect can be achieved by rotating the main shaft by a specific angle relative to the feeding eccentric wheel, it is easy to operate and does not require the replacement of the main shaft and the feeding connecting rod assembly, which helps to increase the switching speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0032] Figure 1 It is a partial structural schematic diagram of an overlock sewing machine shown in an embodiment of the present application when the needle plate is in the first matching position;

[0033] Figure 2 It is a partial structural schematic diagram of an overlock sewing machine shown in an embodiment of the present application when the needle plate is in the second matching position;

[0034] Figure 3 for Figure 2 The position status diagram between the needle plate and the machine needle is shown;

[0035] Figure 4 for Figure 2 A partial structural schematic diagram of the feeding structure in FIG.

[0036] Figure 5 for Figure 4 Schematic diagram of the structure of the main axis in;

[0037] Figure 6 for Figure 2 Exploded view of the structure of the middle part;

[0038] Figure 7 for Figure 6 A schematic diagram of the structure of the cloth feeding eccentric wheel;

[0039] Figure 8 A schematic diagram of a first feeding track of the overlock sewing machine shown in the present application and its corresponding coordinate system;

[0040] Fig. 9 It is a schematic diagram of the second feeding trajectory of the overlock sewing machine shown in this application and its corresponding coordinate system.

[0041] The reference numerals of the components are as follows:

[0042] 100, needle plate; 200, feeding mechanism; 21, main shaft; 211, eccentric section; 212, non-eccentric section; 213, first locking part; 214, second locking part; 22, tooth lifting assembly; 23, cloth feeding assembly; 231, cloth feeding eccentric wheel; 2311, bolt hole; 2311a, first bolt hole; 2311b, second bolt hole; 2311c, third bolt hole; 2311d, fourth bolt hole; 2312, positioning surface; 232, transmission eccentric wheel; 233, feeding connecting rod; 24, tooth rack assembly; 25, tooth assembly; 262, second bolt; 263, third bolt; 300, machine needle; 400, supporting structure. DETAILED DESCRIPTION

[0043] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0044] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0046] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are in contact indirectly through an intermediate medium. Moreover, a first feature being “above”, “above”, or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0047] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0048] The present application provides a sewing machine, which is a machine for sewing textiles to lock the edges, and includes a machine head, a tripod supporting the machine head, and a table for driving the machine head to work. The machine head mainly includes a machine base, a needle plate on the machine base, a machine needle located above the machine needle, a curved needle assembly located below the needle plate, a feeding mechanism, a machine needle driving mechanism, and a curved needle driving mechanism. When the sewing machine is in use, it is usually placed on the ground, and the ground is usually parallel to the horizontal plane, which can also be called a horizontal plane. When working, the operator is located on one side of the needle plate, and the operator's position relative to the sewing machine is in the front-to-back direction. In the subsequent description, the direction of the sewing machine when in use is used as the reference perspective.

[0049] As described in the background technology, when the overlock sewing machine is sewing thicker or harder textiles, the lateral force of the needle will increase with the thickness and hardness of the textile as the needle obliquely penetrates the fabric, which can easily cause the needle tip to bend or even break. In order to solve this problem, the needle plate in the present application is configured with different matching positions that form different angles with the axis of the needle. The degree of the angle is set according to the minimum lateral force that the needle is subjected to when sewing different thicknesses and hardnesses of textiles. The minimum lateral force is the lateral force that ensures that the needle will not bend or break.

[0050] See also Figures 1 to 3 In this embodiment, the needle plate 100 is configured with a first matching position (such as Figure 1 The position shown) and the second matching position forming a second angle (as shown Figure 2 See Figure 1As shown, in the first matching position, the needle plate 100 is parallel to the horizontal plane, that is, the needle plate 100 is placed horizontally. At this time, the first angle between the needle plate 100 and the axis of the needle 300 is 70°. In the first matching position, the overlock sewing machine is used to sew conventional fabrics. Figure 2 and Figure 3 As shown, in the second matching position, an acute angle α of 20° is formed between the needle plate 100 and the horizontal plane, and the second angle α is 90°, that is, the axis xx of the needle 300 is perpendicular to the needle plate 100. In the second matching position, the overlock sewing machine is used to sew thicker or harder textiles. According to tests, the first matching position and the second matching position of the needle plate 100 can basically meet the sewing requirements of different needs. Therefore, in order to simplify the structure, generally speaking, the needle plate 100 is configured with the first matching position and the second matching position. As mentioned above, the angles selected by the needle plate in the first matching position and the second matching position make the angle formed by the needle plate 100 between the first matching position and the second matching position be 20°.

[0051] It should also be noted that during the sewing process, the movement trajectory of the needle 300 is usually along the direction of the axis XX of the needle 300, so the direction in which the needle 300 penetrates the needle plate 100 is the direction of the axis XX of the needle 300. During the sewing process, the angle between the needle 300 and the needle plate 100 usually does not change. In practice, the overall thickness of the needle plate 100 varies at different positions, but the thickness difference is small, so generally speaking, when describing the needle plate 100, the thickness difference can be ignored. The relative position between the needle plate 100 and the needle 300 described in this application is actually the angle formed by the plane where the anti-cloth surface of the needle plate 100 is located and the extension line of the axis XX of the needle 300. In addition, the degrees of the first angle and the second angle mentioned above are not absolute values, and there can be a deviation of ±20° in actual adjustment.

[0052] The adjustment of the needle plate 100 between the first matching position and the second matching position can be achieved by replacing the support structure 400 of the needle plate 100. When the position of the needle plate 100 changes, the position of the coordinate system formed by the feeding track of the corresponding feeding mechanism 200 also needs to change accordingly. In the prior art, if the position of the coordinate system of the feeding track needs to be adjusted, the main shaft and the corresponding feeding connecting rod assembly are usually replaced. However, since the overlock sewing machine in this application needs to adjust the position of the needle plate 100 according to different sewing requirements, that is, the needle plate needs to adjust its position according to the sewing requirements in actual use, and its position is not fixed, so for this overlock sewing machine, the solution of replacing the main shaft and the feeding connecting rod assembly is more troublesome, and for the user, replacing the main shaft and the feeding connecting rod assembly means that two sets of main shafts and corresponding feeding connecting rod assemblies need to be purchased, which inadvertently increases the investment cost.

[0053] In order to solve the above problems, the present application provides a feeding mechanism 200 that can realize the coordinate system deflection switching of the feeding trajectory. The feeding mechanism 200 includes a main shaft 21 for outputting a rotational force, a tooth lifting assembly 22 for converting the rotational force of the main shaft 21 into a linear motion in a first direction, a cloth feeding assembly 23 for converting the rotational force of the main shaft 21 into a linear motion in a second direction, a tooth rack assembly 24 driven by the tooth lifting assembly 22 and the cloth feeding assembly 23 to realize linear motion in the first direction and the second direction, and a tooth assembly 25 installed on the tooth rack assembly 24. Based on the placement position of the overlock machine, the first direction is the up and down direction, and the second direction is the front and back direction. The tooth assembly 25 is driven by the tooth rack assembly 24 to move to form a feeding trajectory, such as Figure 8 and Fig. 9 As shown, the feeding track is an ellipse. Figure 4 , the short axis of the ellipse is the direction of movement made by the tooth lifting component 22 driving the tooth component 25 (i.e. the tooth lifting direction, which is the height direction), and the long axis of the ellipse is the direction of movement made by the cloth feeding component 23 driving the tooth component 25 (i.e. the cloth feeding direction, which is the front-back direction). Generally speaking, the tooth component 25 completes one feeding trajectory, which means the main shaft 21 rotates one circle. Therefore, in the same feeding trajectory, the starting position of the main shaft 21 corresponding to each feeding trajectory is always the same. In the present application, the main shaft 21 is configured with a first starting position and a second starting position rotated by a specific angle compared to the first starting position. The cloth feeding component 23 includes a cloth feeding eccentric wheel 231 that can be locked on the main shaft 21 (see Figure 4 The main shaft 21 switches between the first starting position and the second starting position, and the main shaft 21 rotates a specific angle relative to the cloth feeding eccentric wheel 231. After the main shaft 21 switches between the first position and the second position, the cloth feeding eccentric wheel 231 is locked on the main shaft 21 and is driven by the main shaft 21 to rotate.

[0054] Since the main shaft 21 is configured with a first starting position and a second starting position, the main shaft 21 can be rotated and switched at different positions according to needs. When it switches between the first starting position and the second starting position, the coordinate system of the feeding track of the tooth assembly 25 will be deflected accordingly, so that the feeding track of the tooth assembly 25 can adapt to needle plates 100 with different tilt heights. Since the above effect can be achieved by rotating the main shaft 21 at a specific angle relative to the feeding eccentric wheel 231, it is easy to operate without replacing the main shaft 21 and the feeding connecting rod assembly, which helps to increase the switching speed.

[0055] In this embodiment, the second starting position is rotated counterclockwise by a specific angle compared to the first starting position. Figure 4 and Figure 5The main shaft 21 has an eccentric section 211 and a non-eccentric section 212, and a cloth feeding eccentric wheel 231 is arranged in the non-eccentric section 212. In this embodiment, the cloth feeding assembly 23 also includes a transmission eccentric wheel 232, a small eccentric wheel (not shown) embedded in the transmission eccentric wheel 232, a cylindrical pin (not shown) connecting the small eccentric wheel and the cloth feeding eccentric wheel 231, and a feeding connecting rod 233 sleeved on the transmission eccentric wheel 232. The other structures of the cloth feeding assembly 23 except the cloth feeding eccentric wheel 231 adopt the existing technology, and will not be described in detail here.

[0056] The tooth lifting component 22 is a tooth lifting slider sleeved on the eccentric section 211. The tooth lifting component 22 is a square with a hollow structure. The eccentric section 211 can rotate relative to the tooth lifting component 22. When the main shaft 21 rotates, the tooth lifting component 22 floats up and down in the first direction under its drive, so that the tooth lifting component 22 outputs a linear motion in the first direction. The tooth lifting component 22 cooperates with the corresponding slide groove on the tooth frame component 24. When the main shaft 21 rotates, the tooth lifting component 22 is driven to slide in the slide groove (unnumbered) of the tooth lifting component 22 to drive the tooth lifting component 22 to perform an up and down tooth lifting action.

[0057] See also Figure 8 and Fig. 9 When the spindle 21 is at the first starting position, the tooth assembly 25 moves under the drive of the tooth frame assembly 24 to form a first feeding track, and a rectangular coordinate system is established with the major axis and minor axis of the first feeding track. When the spindle 21 is at the second starting position, the tooth assembly 25 moves under the drive of the tooth frame assembly 24 to form a second feeding track, and a rectangular coordinate system is established with the major axis and minor axis of the second feeding track. In the above embodiment, since the tooth lifting component 22 is arranged in the eccentric section 211, when the main shaft 21 switches between the first initial position and the second initial position, the tooth lifting component 22 will also deflect accordingly. In this way, the position of the short axis of the first feeding trajectory and the position of the short axis of the second feeding trajectory will be different, and the position of the second short axis will be deflected counterclockwise compared to the position of the first short axis. At the same time, the position of the long axis of the first feeding trajectory and the position of the long axis of the second feeding trajectory will also be different, and the position of the second long axis will also be deflected counterclockwise compared to the position of the first long axis. The above counterclockwise deflection angle is the same as the rotation angle of the main shaft 21. In this way, the first rectangular coordinate system is deflected by the same specific angle as the main shaft 21 compared to the second rectangular coordinate system.

[0058] The spindle 21 in the feeding mechanism 200 of this embodiment is configured with a first initial position and a second initial position, the first initial position and the second initial position are set according to the first matching position of the needle plate 100, and the second initial position is set according to the second matching position of the needle plate 100. In other embodiments, when the needle plate 100 can be switched between three or more matching positions, the spindle 21 can also be configured with three or more initial positions accordingly. At this time, when the spindle 21 is at three or more initial positions, the spindle 21 will rotate with respect to the feed eccentric wheel 231 at multiple specific angles, and the multiple specific angles can be the same or different, specifically set according to the rotation position of the needle plate 100. For the convenience of description, the following description is only based on the spindle 21 rotating at a specific angle (i.e., the spindle 21 only switches between the first initial position and the second initial position).

[0059] In the overlock sewing machine using the above-mentioned feeding structure, the angle formed by the needle plate 100 between the first matching position and the second matching position is equal to the specific angle rotated by the main shaft 21. The operation mode of the overlock sewing machine is as follows: when the overlock sewing machine needs to move the needle plate 100 from the horizontal position ( Figure 1 position) to a 20° tilt position ( Figure 2 The main shaft 21 is rotated to realize the deflection of the coordinate system of the cloth feeding trajectory, and then the main shaft 21 and the cloth feeding eccentric wheel 231 are locked with each other, and the needle plate 100, the support structure 400, and the tooth assembly 25 can be replaced according to the inclination angle of the needle plate 100. The overlock sewing machine configures the needle plate 100 to be switchable between the first matching position and the second matching position so as to form different angles with the axis of the needle 300, so as to meet different sewing requirements, and configures the main shaft 21 to be rotatable relative to the cloth feeding eccentric wheel 231, so that the feeding trajectory of the tooth assembly 25 can match the needle plate 100 with different inclination heights. In this way, the overlock sewing machine can meet different sewing requirements while improving the switching speed and making the operation more convenient.

[0060] In this embodiment, the structure of the tooth lifting assembly 22 and the cloth feeding assembly 23 will not change with the rotation of the main shaft 21. Therefore, in this embodiment, the first feeding track and the second feeding track have the same shape. By setting the first feeding track and the second feeding track to be the same, there is no need to change the structure of the cloth feeding assembly 23. In this way, the present application can meet the sewing of materials of different thicknesses only by relying on the rotating main shaft 21, which helps to simplify the overall structure. In other embodiments, the structure of the tooth lifting assembly 22 and the cloth feeding assembly 23 can also be replaced accordingly. In this way, the overlock sewing machine can also adjust the feeding track within the same coordinate system to improve the applicability of the overlock sewing machine.

[0061] The switching of the spindle 21 between the first initial position and the second initial position can be completed by driving the spindle 21 to rotate by a hand wheel (not shown). When the spindle 21 switches between the first initial position and the second initial position, the spindle 21 is disconnected from the feeding motor (not shown). After the spindle 21 completes the switching, the spindle 21 is connected to the feeding motor. The spindle 21 and the feeding motor can be disconnected or connected by a clutch structure. Of course, the switching of the spindle 21 between the first initial position and the second initial position can also be achieved by the feeding motor.

[0062] See the above Figure 4 and Figure 5 , the cloth feeding eccentric wheel 231 is locked on the main shaft 21, specifically, the cloth feeding eccentric wheel 231 is locked on the main shaft 21 by a locking member, and a first locking portion 213 and a second locking portion 214 are formed on the main shaft 21. When the main shaft 21 is in the first starting position, the locking member cooperates with the first locking portion 213; when the main shaft 21 is in the second starting position, the locking member cooperates with the second locking portion 214. By setting the first locking portion 213, the second locking portion 214 and the locking member cooperating with the first locking portion 213 and the second locking portion 214, the locking between the main shaft 21 and the cloth feeding eccentric wheel 231 is conveniently realized.

[0063] See also Figure 6 and Figure 7 In one embodiment, the locking member is a bolt, and a bolt hole 2311 for threadedly engaging with the bolt is formed on the cloth feeding eccentric 231. The cloth feeding eccentric 231 is locked with the main shaft 21 by using the bolt to abut against the first locking portion 213 or the second locking portion 214, thereby simplifying the locking structure and facilitating implementation. In order to improve the locking strength, the first locking portion 213 and the second locking portion 214 are turning surfaces (i.e., the first turning surface and the second turning surface) formed on the main shaft 21.

[0064] In this embodiment, since the angle formed by the needle plate 100 between the first matching position and the second matching position is 20°, the corresponding specific angle of rotation of the spindle 21 from the first initial position to the second initial position is 20°. However, due to the limitations of the existing process and the diameter of the spindle 21, if the angle between the first locking portion 213 and the second locking portion 214 is 20°, the first locking portion 213 and the second locking portion 214 will partially overlap, that is, the first locking portion 213 and the second locking portion 214 will be mutually destroyed, thus destroying the locking effect. In order to solve this problem, in this embodiment, the angle between the first locking portion 213 and the second locking portion 214 is set to increase 90° on the basis of the specific angle, thus expanding the gap between the two turning surfaces in the circumferential direction to avoid the first locking portion 213 and the second locking portion 214 from overlapping. In order to facilitate locking, the locking member includes a first bolt (not shown) matched with the first locking portion 213 and a second bolt 262 matched with the second locking portion 214, and the difference between the degree of the angle formed by the axis of the first bolt and the axis of the second bolt 262 and the degree of the specific angle is 90°. By using the first bolt to match the first locking portion 213 and the second bolt 262 to match the second locking portion 214 to achieve corresponding locking, the problem caused by increasing the area of ​​the turning surface is solved while reducing the process difficulty. Of course, the difference between the degree of the angle formed by the axis of the first bolt and the axis of the second bolt 262 and the degree of the specific angle can also be 180 degrees, that is, the difference between the degree of the angle formed by the axis of the first bolt and the axis of the second bolt 262 and the degree of the specific angle can be set to n*90°, n≥2.

[0065] In another embodiment, the locking member may also be other structures as long as the circumferential locking of the cloth feeding eccentric 231 and the main shaft 21 can be achieved. For example, the locking member is an elastic structure formed on the cloth feeding eccentric 231, and the elastic structure includes a spring and a steel ball arranged on one side of the spring. A receiving groove for accommodating the locking member is formed in the cloth feeding eccentric 231, and correspondingly, two grooves are formed on the main shaft 21. Under the action of the spring, part of the steel ball enters into one of the grooves, and the other part remains in the receiving groove.

[0066] In one embodiment, in order to further improve the locking strength, an auxiliary locking member is further provided between the cloth feeding eccentric wheel 231 and the main shaft 21. Specifically, the auxiliary locking member is a bolt used to threadably cooperate with the cloth feeding eccentric wheel 231. In this way, the locking structure is simplified and easy to implement. In order to improve the locking strength, after testing, when the axis of the auxiliary locking member is perpendicular to the axis of the locking member, the effect of both locking the main shaft 21 is best. To achieve this purpose, in this embodiment, the auxiliary locking member includes a third bolt 263 and a fourth bolt (not shown). When the first bolt cooperates with the first locking portion 213, the fourth bolt is locked on the main shaft 21; when the second bolt 262 cooperates with the second locking portion 214, the third bolt 263 is locked on the main shaft 21. The axis of the first bolt is perpendicular to the axis of the fourth bolt, and the axis of the second bolt 262 is perpendicular to the axis of the third bolt 263. It should be noted that the verticality can be approximately vertical. Generally speaking, the angle formed by the axis of the first bolt and the axis of the fourth bolt, and the angle formed by the axis of the second bolt 262 and the axis of the third bolt 263 have good locking force in the range of 70°-110°. By setting the axis of the first bolt and the fourth bolt to be vertical, and setting the axis of the second bolt 262 and the third bolt 263 to be vertical, when the first bolt, the fourth bolt, or the second bolt 262 and the third bolt 263 are used to lock the feed eccentric wheel 231 to the main shaft 21, slippage can also be avoided.

[0067] The cloth feeding eccentric wheel 231 has a first bolt hole 2311a, a second bolt hole 2311b, a third bolt hole 2311c and a fourth bolt hole 2311d formed thereon corresponding to the first bolt, the second bolt 262, the third bolt 263 and the fourth bolt. As the first bolt and the second bolt 262 are main locking parts, the axis of the first bolt hole 2311a and the axis of the second bolt hole 2311b need to pass through the axis of the main shaft 21, and the first bolt and the second bolt 262 need to correspond to the first locking portion 213 and the second locking portion 214 respectively when locked. Therefore, the positions of the first bolt and the second bolt 262 need to be relatively accurate. Thus, the first bolt hole 2311a and the second bolt hole 2311b on the cloth feeding eccentric wheel 231 need to be as accurate as possible when opening the holes. In order to achieve this purpose, in this embodiment, a positioning surface 2312 is formed on the outer wheel surface of the cloth feeding eccentric wheel 231. When drilling holes, the first bolt hole 2311a and the second bolt hole 2311b are drilled toward the axis direction by the positioning surface 2312. The third bolt 263 and the fourth bolt only need their axes to be as perpendicular as possible to the axes of the first bolt and the second bolt 262, respectively. Therefore, when drilling the third bolt hole 2311c and the fourth bolt hole 2311d, the positioning surface 2312 may not be formed on the outer wheel surface, and the axes of the third bolt 263 and the fourth bolt may not pass through the axis.

[0068] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0069] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A feeding mechanism, characterized in that: include: A main shaft, used for outputting rotational force; A tooth lifting assembly, used for converting the rotational force into a linear motion in a first direction; A cloth feeding assembly, used for converting the rotational force into a linear motion in a second direction, the cloth feeding assembly comprising a cloth feeding eccentric wheel locked on the main shaft; A tooth frame assembly, wherein the tooth frame assembly is driven by the tooth lifting assembly and the cloth feeding assembly to realize linear motion in a first direction and a second direction; and A tooth component, the tooth component is mounted on the tooth frame component and is driven to move by the tooth frame component; Wherein, the spindle is configured with a first starting position and a second starting position rotated by a specific angle compared with the first starting position; the spindle switches between the first starting position and the second starting position, and the spindle rotates by the specific angle compared with the feed eccentric wheel.

2. The feeding mechanism according to claim 1, characterized in that: When the spindle is in the first starting position, the tooth component is driven by the tooth rack component to move to form a first feeding trajectory; when the spindle is in the second starting position, the tooth component is driven by the tooth rack component to move to form a second feeding trajectory; the first feeding trajectory and the second feeding trajectory have the same shape.

3. The feeding mechanism according to claim 1 or 2, characterized in that: The cloth feeding eccentric wheel is locked on the main shaft through a locking piece, and a first locking portion and a second locking portion are formed on the main shaft; when the main shaft is in the first starting position, the locking piece cooperates with the first locking portion; when the main shaft is in the second starting position, the locking piece cooperates with the second locking portion.

4. The feeding mechanism according to claim 3, characterized in that: The locking piece is a locking piece, and a bolt hole for matching with a bolt thread is formed on the cloth feeding eccentric wheel.

5. The feeding mechanism according to claim 4, characterized in that: The first locking portion and the second locking portion are turned surfaces formed on the main shaft.

6. The feeding mechanism according to claim 5, characterized in that: The locking member includes a first bolt cooperating with the first locking portion and a second bolt cooperating with the second locking portion, and the difference between the degree of the angle formed by the axis of the first bolt and the axis of the second bolt and the degree of the specific angle is n*90°, n≥2.

7. The feeding mechanism according to claim 6, characterized in that: An auxiliary locking piece is arranged between the cloth feeding eccentric wheel and the main shaft.

8. The feeding mechanism according to claim 7, characterized in that: The auxiliary locking piece is a bolt used to cooperate with the thread of the cloth feeding eccentric wheel.

9. The feeding mechanism according to claim 8, characterized in that: The auxiliary locking member includes a third bolt and a fourth bolt; wherein, when the first bolt cooperates with the first locking portion, the fourth bolt is locked on the main shaft; when the second bolt cooperates with the second locking portion, the third bolt is locked on the main shaft; the axis of the first bolt is perpendicular to the axis of the fourth bolt, and the axis of the second bolt is perpendicular to the axis of the third bolt.

10. An overlock sewing machine, characterized in that: It includes a machine base, a needle plate arranged on the machine base, a machine needle located above the needle plate, and a feeding mechanism as described in any one of claims 1 to 9; the needle plate is configured with a first matching position and a second matching position that form different angles with the axis of the machine needle; the angle formed by the needle plate between the first matching position and the second matching position is equal to the specific angle of rotation of the main shaft.

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