Household flat seaming machine

Abstract

The invention belongs to the technical field of sewing equipment, and particularly relates to a household flat seaming machine which comprises a rack, a needle plate, a straight needle mechanism, a lower curved needle mechanism, a chain curved needle mechanism, a cloth feeding mechanism and a power mechanism. The power mechanism comprises a power source, a main shaft, an upper shaft, a first eccentric connecting rod, a second eccentric connecting rod and a shifting fork rocker. The cloth feeding mechanism comprises cloth feeding teeth, a feeding tooth frame, a feeding rocker, a feeding connecting rod, a transmission shaft, an eccentric nut and a feed lifting eccentric connecting rod. Compared with the prior art, the household flat seaming machine is compact in structure, easy to operate, low in cost and stable in performance.

Description

Technical Field

[0001] This invention belongs to the field of sewing equipment technology, and in particular relates to a household cover-up sewing machine. Background Technology

[0002] A coverstitch sewing machine (also known as a coverstitch sewing machine) is a professional industrial sewing machine mainly used for sewing elastic fabrics or processes requiring high tensile strength. Its characteristic is the formation of multi-thread chain stitches (usually covert stitches), which are elastic, strong, and aesthetically pleasing. It is commonly used for sewing knitted garments, sportswear, underwear, T-shirts, and other products.

[0003] Currently, most of the popular sewing machines available for home use are overlock sewing machines. While they offer some convenience for overlocking and hemming garment fabrics, they lack the function of covering sewing. Covering sewing machines are also available on the market, but these are designed for industrial applications. Due to their high manufacturing costs, they are not suitable for home use and could easily increase the financial burden on families. Therefore, there is a need to develop a covering sewing machine suitable for home use. Summary of the Invention

[0004] The purpose of this invention is to address the aforementioned technical problems by providing a household cover-up sewing machine that is compact in structure, simple to operate, inexpensive, and has stable performance.

[0005] In view of this, the present invention provides a household cover-up sewing machine, including a frame, a needle plate, a straight needle mechanism, a lower looper mechanism, a chain looper mechanism, a fabric feeding mechanism, and a power mechanism; The needle plate is set on the frame, the straight needle mechanism is located above the needle plate, and the lower bending needle mechanism and the chain bending needle mechanism are located below the needle plate. The power mechanism includes a power source, a main shaft, an upper shaft, an eccentric connecting rod one, an eccentric connecting rod two, and a shift fork rocker arm. The power source drives the main shaft to rotate, the main shaft drives the upper shaft to swing through the eccentric connecting rod one, the upper shaft drives the straight needle mechanism to move, and the main shaft drives the lower bending needle mechanism and the chain bending needle mechanism to move through the cooperation of the eccentric connecting rod two and the shift fork rocker arm. The fabric feeding mechanism includes a feeding tooth, a feeding tooth holder, a feeding rocker arm, a feeding connecting rod, a drive shaft, an eccentric nut, and a tooth-lifting eccentric connecting rod. The feeding tooth is mounted on the feeding tooth holder, located below the needle plate and partially extending above it. The main shaft drives the tooth-lifting eccentric connecting rod to move, thereby driving the feeding tooth holder to move closer to and further away from the needle plate. When the main shaft drives the drive shaft to rotate, the drive shaft drives the feeding rocker arm to oscillate back and forth through the feeding connection, thereby driving the feeding tooth holder to oscillate back and forth. The eccentric nut can adjust the displacement of the drive shaft in the radial direction of the main shaft, thereby adjusting the oscillation amplitude of the feeding rocker arm.

[0006] In the above technical solution, the feeding rocker arm further includes a rotating part and a swinging part. The rotating part is connected to the transmission shaft through the feeding connecting rod, and the swinging part is connected to the feeding gear.

[0007] In the above technical solution, the tooth-lifting eccentric connecting rod further includes a tooth-lifting wheel, which is connected to the main shaft. A transmission pin is provided at one end of the tooth-lifting wheel near the eccentric screw. The transmission pin can move radially along the tooth-lifting wheel. The transmission shaft is connected to the transmission pin. An eccentric nut is provided at one end near the transmission pin, and a concentric groove is provided at the other end of the eccentric nut. The transmission pin extends into the eccentric groove, and both ends of the transmission pin abut against the side wall of the eccentric groove. The transmission shaft passes through the eccentric groove and the concentric groove and is connected to the feeding connecting rod.

[0008] In the above technical solution, further, a radial groove and an axial groove are provided at the end of the lifting gear near the eccentric screw. The radial groove is provided along the diameter direction of the lifting gear, and the axial groove is connected to the radial groove. The transmission pin is slidably disposed in the radial groove, and the transmission shaft is disposed in the axial groove. The diameter of the axial groove is larger than the diameter of the transmission shaft.

[0009] In the above technical solution, further, when the eccentric nut is manually rotated, the end of the transmission pin can move continuously in the circumferential direction on the side wall of the eccentric groove, and a limiting block is provided on the side wall of the eccentric groove to restrict the movement of the transmission pin.

[0010] In the above technical solution, further, the end of the feeding connecting rod away from the feeding rocker arm is connected to the transmission shaft through a connecting rod sleeve.

[0011] In the above technical solution, the tooth lifting eccentric linkage further includes a tooth lifting linkage, one end of which is connected to a tooth lifting wheel, and the other end of which is connected to a feeding tooth frame.

[0012] In the above technical solution, the power source further includes a motor, a driving wheel, and a driven wheel. The driving wheel is connected to the output shaft of the motor, the driven wheel is connected to the main shaft, and the driving wheel and the driven wheel are connected by a transmission belt or a transmission chain.

[0013] The beneficial effects of this invention are: 1. The straight needle mechanism, lower looper mechanism, chain looper mechanism, and fabric feeding mechanism are all controlled by a separate eccentric structure through a power mechanism, which reduces motion interference between the mechanisms, simplifies the design and assembly, reduces the difficulty of adjustment, and lowers the operating cost.

[0014] 2. The feeding rocker arm is divided into a rotating part and a swinging part, which makes the motion transmission more precise, reduces the inertia of the moving parts, and improves the operating speed of the feeding mechanism.

[0015] 3. The stitch length can be adjusted by manually rotating the eccentric nut through the cooperation of the drive shaft, lifting wheel, drive pin, eccentric nut, eccentric groove, and concentric groove. The operation is simple, and the continuous circumferential movement design makes the adjustment stepless and variable to meet different sewing needs. In addition, the design of the limit block prevents over-adjustment from damaging the mechanism. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 1 To better illustrate the main structure, some of the outer shell has been omitted from the diagram.

[0018] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention. Figure 2 To better illustrate the main structure, some of the outer shell has been omitted from the diagram.

[0019] Figure 3 This is a schematic diagram of the main structure of the present invention. For the sake of showing the main structure, part of the outer shell has been omitted in the figure.

[0020] Figure 4 This is a three-dimensional structural diagram of the fabric feeding mechanism in this invention. Figure 1 .

[0021] Figure 5 This is a three-dimensional structural diagram of the fabric feeding mechanism in this invention. Figure 2 .

[0022] Figure 6 This is a schematic diagram of the main structure of the fabric feeding mechanism in this invention.

[0023] Figure 7 This is a three-dimensional structural diagram of the eccentric nut in this invention.

[0024] Figure 8 This is a three-dimensional structural diagram of the lifting roller in this invention.

[0025] Figure 9 This is a schematic diagram showing the connection of the drive shaft, drive pin, toothed roller, and eccentric nut in this invention.

[0026] The markings in the diagram are as follows: 1. Frame; 2. Needle plate; 3. Straight needle mechanism; 4. Lower bend needle mechanism; 5. Chain bend needle mechanism; 6. Fabric feeding mechanism; 601. Fabric feeding teeth; 602. Feeding tooth holder; 603. Feeding rocker arm; 604. Feeding connecting rod; 605. Drive shaft; 606. Eccentric nut; 6061. Eccentric groove; 6062. Concentric groove; 6063. Limiting block; 607. Lifting gear; 6071. Radial groove; 6072. Axial groove; 608. Lifting connecting rod; 609. Drive pin; 7. Power source; 701. Motor; 702. Driving wheel; 703. Driven wheel; 8. Main shaft; 9. Upper shaft; 10. Eccentric connecting rod one; 11. Eccentric connecting rod two; 12. Shift fork rocker arm. Detailed Implementation

[0027] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this invention, it should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments of the invention. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0029] like Figures 1-9 As shown, this embodiment provides a household cover-up sewing machine, including a frame 1, a needle plate 2, a straight needle mechanism 3, a lower looper mechanism 4, a chain looper mechanism 5, a fabric feeding mechanism 6, and a power mechanism. Rack 1 The frame 1 can be injection molded from high-strength engineering plastic. The frame 1 is equipped with metal reinforcing ribs. The needle plate 2 is fixed to the frame 1 with screws. Straight needle mechanism 3, lower bend needle mechanism 4, chain bend needle mechanism 5, and power mechanism Please see Figure 2The straight needle mechanism 3 is located above the needle plate 2. The movement trajectory of the straight needle mechanism 3 is a linear reciprocating motion. The lower looper mechanism 4 and the chain looper mechanism 5 are located below the needle plate 2. The movement trajectory of the lower looper mechanism 4 and the chain looper mechanism 5 is a left-right swinging motion. The lower looper mechanism 4 and the chain looper mechanism 5 work together to form a stable stitch. The lower looper is not shown in the figure, but a support for mounting the lower looper is shown. The power mechanism includes a power source 7, a main shaft 8, an upper shaft 9, an eccentric connecting rod 10, an eccentric connecting rod 2 11, and a shift fork rocker arm 12. Please refer to [link / reference needed]. Figure 3 The power source 7 drives the main shaft 8 to rotate. The main shaft 8 drives the upper shaft 9 to swing back and forth through the eccentric connecting rod 10, thereby driving the straight needle mechanism 3 to perform linear reciprocating motion. The main shaft 8 drives the lower bending needle mechanism 4 and the chain bending needle mechanism 5 to swing back and forth left and right through the cooperation of the eccentric connecting rod 2 11 and the shift fork rocker arm 12. The straight needle mechanism 3 moves up and down in coordination with the lower curved needle mechanism 4 and the chain curved needle mechanism 5 swing left and right, which can form a multi-line chain stitch at the needle plate 2. In this embodiment, please refer to Figure 2 The power source 7 includes a motor 701, a drive wheel 702, and a driven wheel 703. The drive wheel 702 is connected to the output shaft of the motor 701, and the driven wheel 703 is connected to the main shaft 8. The drive wheel 702 and the driven wheel 703 are connected by a transmission belt or a transmission chain. The motor 701 is preferably a low-noise DC motor, which is suitable for home use. Fabric delivery mechanism 6 The fabric feeding mechanism 6 includes a fabric feeding tooth 601, a feeding tooth holder 602, a feeding rocker arm 603, a feeding connecting rod 604, a drive shaft 605, an eccentric nut 606, and a tooth lifting eccentric connecting rod. Please refer to [link / reference needed]. Figure 4 and Figure 5 The feed tooth 601 is mounted on the feed gripper 602. The feed tooth 601 is located below the needle plate 2 and partially extends above it to contact the fabric. The main shaft 8 drives the eccentric linkage to move, thereby driving the feed gripper 602 to move closer to and away from the needle plate 2. (See also...) Figure 5 In this embodiment, the tooth lifting eccentric linkage includes a tooth lifting wheel 607 and a tooth lifting linkage 608. The tooth lifting wheel 607 is coaxially connected to the main shaft 8. One end of the tooth lifting linkage 608 is connected to the tooth lifting wheel 607, and the other end of the tooth lifting linkage 608 is connected to the feeding tooth frame 602. During the process of the main shaft 8 driving the tooth lifting wheel 607 to rotate, the tooth lifting linkage 608 will drive the feeding tooth frame 602 to move up and down. Please see Figure 4The feeding rocker arm 603 includes a rotating part and a swinging part. The rotating part is rotatably connected to the frame 1. The rotating part is connected to the transmission shaft 605 through the feeding connecting rod 604, so that when the transmission shaft 605 rotates, it can drive the rotating part of the feeding rocker arm 603 to reciprocate and rotate a certain angle through the feeding connecting rod 604, thereby driving the swinging part to swing back and forth a certain angle. The swinging part is connected to the feeding tooth frame 602. In this way, the rotation of the transmission shaft 605 can drive the feeding tooth 601 to move back and forth to achieve feeding. Fabric delivery process Initially, the feed tooth 601 is located at the front of the needle plate 2. The lifting linkage 608 drives the feed tooth holder 602 and the feed tooth 601 to move upward, allowing the feed tooth 601 to contact the fabric. Then, the transmission shaft 605 drives the feed tooth 601 to move backward of the needle plate 2. Please refer to [link / reference]. Figure 4 The top of the feed tooth 601 is provided with backward-sloping serrations. During the backward movement of the feed tooth 601, the serrations will move the fabric along with it, thereby conveying the fabric backward until the feed tooth 601 reaches the limit position of the backward movement. This position is also the swing limit position of the swing part of the feed rocker 603. Then, the lifting tooth connecting rod 608 drives the feed tooth frame 602 and the feed tooth 601 to move downward so that the feed tooth 601 moves away from the fabric. Then, the transmission shaft 605 drives the feed tooth 601 to move forward of the needle plate 2 so that the feed tooth 601 returns to the initial position. Power transmission path Motor 701 → Drive wheel 702 → Transmission belt / chain → Driven wheel 703 → Main shaft 8 → (via eccentric connecting rod 10 → upper shaft 9 → straight needle mechanism 3) and (via eccentric connecting rod 21 and shift fork rocker arm 12 → lower bend needle mechanism 4 and chain bend needle mechanism 5) and (via lifting tooth eccentric connecting rod and crank rocker arm mechanism → fabric feeding mechanism 6).

[0030] Linkage structure between the lifting gear 607 and the drive shaft 605 Please see Figure 9 A drive pin 609 is provided at one end of the lifting gear 607 near the eccentric screw. The drive pin 609 can move radially along the lifting gear 607. The drive shaft 605 is connected to the drive pin 609. For an example, please refer to [reference needed]. Figure 8 The lifting gear 607 has a radial groove 6071 and an axial groove 6072 near the eccentric screw. The radial groove 6071 is arranged along the diameter direction of the lifting gear 607, and the axial groove 6072 communicates with the radial groove 6071. The drive pin 609 is slidably disposed in the radial groove 6071, and the drive shaft 605 is disposed in the axial groove 6072. The diameter of the axial groove 6072 is larger than the diameter of the drive shaft 605. Please see Figure 7An eccentric nut 606 is provided with an eccentric groove 6061 at one end near the drive pin 609, and a concentric groove 6062 connecting the eccentric groove 6061 is provided at the other end of the eccentric nut 606. The drive pin 609 extends into the eccentric groove 6061 and both ends of the drive pin 609 abut against the side wall of the eccentric groove 6061. The drive shaft 605 passes through the eccentric groove 6061 and the concentric groove 6062 and is connected to the feeding connecting rod 604. When the lifting gear 607 is driven to rotate by the main shaft 8, the lifting gear 607 will drive the drive pin 609 to move. The drive pin 609 drives the drive shaft 605 to make a circumferential movement eccentric to the lifting gear 607. During this process, the drive shaft 605 drives the feeding rocker arm 603 to swing back and forth through the feeding connecting rod 604, so as to realize the back and forth movement of the feeding toother 602. When the drive shaft 605 is in motion, the eccentric nut 606 will move along with the drive shaft 605. Manually rotating the eccentric nut 606 can adjust the position of the drive pin 609 in the radial direction of the lifting gear 607, thereby adjusting the displacement of the drive shaft 605 in the radial direction of the main shaft 8. This allows adjustment of the swing amplitude of the feeding rocker arm 603, that is, adjustment of the distance of the feeding toother 602 moving back and forth, thus achieving the adjustment of the needle pitch. When the eccentric nut 606 is manually rotated, the end of the transmission pin 609 can move continuously circumferentially on the side wall of the eccentric groove 6061, thus achieving stepless stitch length adjustment to meet different sewing needs; please refer to Figure 7 The side wall of the eccentric groove 6061 is provided with a limiting block 6063 that can restrict the movement of the transmission pin 609. When the transmission pin 609 contacts the limiting block 6063, the operator can feel obvious resistance, indicating that the limit of unidirectional adjustment has been reached. At this time, it can only be adjusted in the other direction, which can prevent over-adjustment from damaging the mechanism. Please see Figure 4 A connecting rod sleeve is provided on the drive shaft 605. The connecting rod sleeve is T-shaped. One end of the connecting rod sleeve abuts against the end face of the eccentric nut 606. The end of the feeding connecting rod 604 away from the feeding rocker arm 603 is sleeved on the outer wall of the other end of the connecting rod sleeve. A screw is connected to the end of the drive shaft 605 to limit the axial displacement of the feeding connecting rod 604 on the drive shaft 605.

[0031] The embodiments of the present invention have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features in the embodiments of the present invention can be combined with each other. The present invention is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present invention without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of the present invention.

Claims

1. A household cover-up sewing machine, characterized in that, It includes a frame (1), a needle plate (2), a straight needle mechanism (3), a lower looper needle mechanism (4), a chain looper needle mechanism (5), a fabric feeding mechanism (6), and a power mechanism; The needle plate (2) is mounted on the frame (1), the straight needle mechanism (3) is located above the needle plate (2), and the lower bending needle mechanism (4) and the chain bending needle mechanism (5) are located below the needle plate (2). The power mechanism includes a power source (7), a main shaft (8), an upper shaft (9), an eccentric connecting rod one (10), an eccentric connecting rod two (11), and a fork rocker arm (12). The power source (7) drives the main shaft (8) to rotate. The main shaft (8) drives the upper shaft (9) to swing through the eccentric connecting rod one (10). The upper shaft (9) drives the straight needle mechanism (3) to move. The main shaft (8) drives the lower bent needle mechanism (4) and the chain bent needle mechanism (5) to move through the cooperation of the eccentric connecting rod two (11) and the fork rocker arm (12). The fabric feeding mechanism (6) includes a fabric feeding tooth (601), a feeding tooth holder (602), a feeding rocker arm (603), a feeding connecting rod (604), a transmission shaft (605), an eccentric nut (606), and a tooth-lifting eccentric connecting rod. The main shaft (8) drives the tooth-lifting eccentric connecting rod to move, thereby driving the feeding tooth holder (602) to move closer to and further away from the needle plate (2). When the main shaft (8) drives the transmission shaft (605) to rotate, the transmission shaft (605) drives the feeding rocker arm (603) to swing back and forth through the feeding connecting rod (604), thereby driving the feeding tooth holder (602) to move back and forth. The eccentric nut (606) can adjust the displacement of the transmission shaft (605) in the radial direction of the main shaft (8), thereby adjusting the swing amplitude of the feeding rocker arm (603).

2. The household cover-up sewing machine according to claim 1, characterized in that: The feeding rocker arm (603) includes a rotating part and a swinging part. The rotating part is connected to the transmission shaft (605) through the feeding connecting rod (604), and the swinging part is connected to the feeding gear (602).

3. The household cover-up sewing machine according to claim 2, characterized in that: The tooth-lifting eccentric connecting rod includes a tooth-lifting wheel (607), which is connected to the main shaft (8). A drive pin (609) is provided at one end of the tooth-lifting wheel (607) near the eccentric screw. The drive pin (609) can move radially along the tooth-lifting wheel (607). The drive shaft (605) is connected to the drive pin (609). An eccentric nut (606) is provided at one end near the drive pin (609). The eccentric nut (606) has a groove (6061) at one end and a concentric groove (6062) at the other end, which communicates with the eccentric groove (6061). The transmission pin (609) extends into the eccentric groove (6061) and both ends of the transmission pin (609) abut against the side wall of the eccentric groove (6061). The transmission shaft (605) passes through the eccentric groove (6061) and the concentric groove (6062) and is connected to the feeding rod (604).

4. The household cover-up sewing machine according to claim 3, characterized in that: The lifting gear (607) has a radial groove (6071) and an axial groove (6072) at one end near the eccentric screw. The radial groove (6071) is arranged along the diameter direction of the lifting gear (607), and the axial groove (6072) communicates with the radial groove (6071). The transmission pin (609) is slidably disposed in the radial groove (6071), and the transmission shaft (605) is disposed in the axial groove (6072). The diameter of the axial groove (6072) is larger than the diameter of the transmission shaft (605).

5. The household cover-up sewing machine according to claim 3, characterized in that: When the eccentric nut (606) is manually rotated, the end of the transmission pin (609) can move continuously in the circumferential direction on the side wall of the eccentric groove (6061). A limiting block (6063) is provided on the side wall of the eccentric groove (6061) to restrict the movement of the transmission pin (609).

6. The household cover-up sewing machine according to claim 3, characterized in that: The end of the feeding connecting rod (604) away from the feeding rocker arm (603) is connected to the transmission shaft (605) through a connecting rod sleeve.

7. The household cover-up sewing machine according to claim 3, characterized in that: The tooth-lifting eccentric linkage includes a tooth-lifting linkage (608), one end of which is connected to the tooth-lifting wheel (607), and the other end of which is connected to the feeding tooth frame (602).

8. The household cover-up sewing machine according to claim 1, characterized in that: The power source (7) includes a motor (701), a drive wheel (702), and a driven wheel (703). The drive wheel (702) is connected to the output shaft of the motor (701), and the driven wheel (703) is connected to the main shaft (8). The drive wheel (702) and the driven wheel (703) are connected by a transmission belt or a transmission chain.

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