Feed dog drive mechanism for a sewing machine

Abstract

The utility model provides a kind of sewing machine's feed dog driving mechanism, including shell, motor and feeding assembly, motor is fixed on the side surface of shell, feeding assembly includes forked crank, synchronous connecting rod, feeding swing bar, feeding connecting rod, feed dog frame, feed dog, forked crank is fixed with the output shaft of motor, between the end portion of forked crank and feeding swing bar, it is connected by synchronous connecting rod, feeding swing bar is equipped with feeding swing bar shaft, the side surface of shell is equipped with two fixed lugs, the both ends of feeding swing bar shaft are respectively hinged on two fixed lugs, between the end portion of feeding swing bar and feed dog frame, it is connected by feeding connecting rod, feed dog is installed on feed dog frame.The feed dog driving mechanism of this sewing machine is driven to feed dog by motor and feeding assembly, motor directly drives and can be adjusted to the swing amplitude of feed dog by computer control motor operation, realize the combination and simplification of the driving structure and the adjusting structure of feed dog.

Description

Technical Field

[0001] This utility model belongs to the technical field of sewing machine equipment and relates to a feed dog drive mechanism for a sewing machine. Background Technology

[0002] The feeding motion of a current sewing machine is generally achieved as follows: A stitch length assembly is installed on the main shaft, connected to a differential crank via a connecting rod. A slider is mounted on the differential crank, which is installed in a long slot within the differential feed dog. The differential crank is fixed to the feed shaft, and a feed crank is also fixed to the feed shaft. The feed crank is connected to the feed dog via a small connecting rod. When the feed eccentric wheel on the main shaft rotates with the main shaft, it is converted into the oscillation of the differential crank via the connecting rod. The slider on the differential crank drives the differential feed dog, and simultaneously, the differential crank drives the feed shaft to oscillate back and forth. The feed crank on the feed shaft also oscillates accordingly, and the feed crank drives the feed dog via the connecting rod. The above transmission process relies on the rotation of the main shaft for drive. However, the main shaft is relatively long, and it is prone to wobbling during rotation. This wobbling is transmitted to the feed dog through the feed eccentric wheel, connecting rod, and differential crank, causing unstable feed and ultimately unstable stitches. Summary of the Invention

[0003] The purpose of this invention is to address the aforementioned problems in the prior art by providing a feed dog drive mechanism for a motor-driven sewing machine.

[0004] The objective of this utility model can be achieved through the following technical solution: A feed dog drive mechanism for a sewing machine includes a housing, a motor, and a feed assembly. The motor is mounted on the side of the housing. The feed assembly includes a fork-shaped crank, a synchronous connecting rod, a feed swing arm, a feed connecting rod, a feed dog holder, and feed dogs. The fork-shaped crank is fixed to the output shaft of the motor. The ends of the fork-shaped crank and the feed swing arm are connected by the synchronous connecting rod. The feed swing arm is provided with a feed swing arm shaft. Two fixing protrusions are provided on the side of the housing. The two ends of the feed swing arm shaft are respectively hinged to the two fixing protrusions. The ends of the feed swing arm are connected to the feed dog holder through the feed connecting rod. The feed dogs are mounted on the feed dog holder.

[0005] In the feed dog drive mechanism of the sewing machine described above, the motor drives the fork-shaped crank to rotate, the synchronous connecting rod drives and causes the feed swing arm to swing around the feed swing arm shaft, and the feed swing arm swings through the feed connecting rod to the feed dog frame and the feed dog.

[0006] In the feed dog drive mechanism of the sewing machine described above, the feed assembly is located outside the housing.

[0007] In the feed dog drive mechanism of the sewing machine described above, the output shaft of the motor is parallel to the length direction of the housing.

[0008] In the feed dog drive mechanism of the sewing machine described above, the fixing protrusion is integrally formed with the housing.

[0009] In the feed dog drive mechanism of the sewing machine described above, a fixed seat is provided on the outer side of the housing, and the motor is fixed on the fixed seat.

[0010] Compared with existing technologies, the feed dog drive mechanism of this sewing machine drives the feed dog through a motor and a feeding assembly. The motor directly drives the feed dog, and the swing amplitude of the feed dog can be adjusted by computer control of the motor's operation. This combines and simplifies the drive and adjustment structures of the feed dog, and allows for independent control and drive, making the adjustment more precise and reliable. The feeding assembly has a simple structure and stable transmission. The feeding assembly is located on the outside of the housing, avoiding the influence of the main shaft drive motor and the rotation of the main shaft. At the same time, it has significant improvements in assembly deformability, lower noise, control efficiency, and control accuracy. In addition, the feeding assembly does not occupy the internal space of the housing, freeing up space inside the housing for the installation of other structures. Attached Figure Description

[0011] Figure 1 This is a three-dimensional structural diagram of the feed dog drive mechanism of this sewing machine.

[0012] Figure 2 yes Figure 1 A magnified structural diagram of point A in the middle.

[0013] In the diagram, 1 is the housing; 2 is the motor; 3 is the fork-shaped crank; 4 is the synchronous connecting rod; 5 is the feeding swing arm; 6 is the feeding connecting rod; 7 is the feeding tooth frame; 8 is the feeding tooth; 9 is the feeding swing arm shaft; 10 is the fixing protrusion; and 11 is the fixing seat. Detailed Implementation

[0014] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0015] like Figure 1 and Figure 2As shown, the feed dog drive mechanism of this sewing machine includes a housing 1, a motor 2, and a feed assembly. The motor 2 is mounted on the side of the housing 1. The feed assembly includes a fork-shaped crank 3, a synchronous connecting rod 4, a feed swing arm 5, a feed connecting rod 6, a feed dog holder 7, and a feed dog 8. The fork-shaped crank 3 is fixed to the output shaft of the motor 2, and the ends of the fork-shaped crank 3 and the feed swing arm 5 are connected by the synchronous connecting rod 4. The feed swing arm 5 is provided with a feed swing arm shaft 9, and two fixing protrusions 10 are provided on the side of the housing 1. The two ends of the feed swing arm shaft 9 are respectively hinged to the two fixing protrusions 10. The ends of the feed swing arm 5 are connected to the feed dog holder 7 by the feed connecting rod 6, and the feed dog 8 is mounted on the feed dog holder 7.

[0016] Motor 2 drives the fork-shaped crank 3 to rotate, and the synchronous connecting rod 4 drives and causes the feeding swing arm 5 to swing around the feeding swing arm shaft 9. The feeding swing arm 5 swings through the feeding connecting rod 6 to the feeding tooth frame 7 and the feeding tooth 8, thus completing the driving of the feeding tooth 8 to swing and feed.

[0017] In the above technical solution: a fixing seat 11 is provided on the outer side of the housing 1, and the motor 2 is fixed on the fixing seat 11.

[0018] In the above technical solution: the output shaft of motor 2 is parallel to the length direction of housing 1.

[0019] In the above technical solution: the fixing protrusion 10 is integrally formed with the shell 1.

[0020] In the above technical solution, the feeding assembly is located on the outside of the housing 1, separating the feeding assembly from the main shaft located inside the housing 1. This avoids the influence of the main shaft drive motor and the rotation of the main shaft. Simultaneously, it significantly improves assembly deformability, reduces noise, and enhances control efficiency and precision. Furthermore, the feeding assembly does not occupy internal space within the housing 1. In actual production, the size of the housing 1 is generally limited, often making it difficult to guarantee sufficient space for the feeding assembly. Therefore, placing the feeding assembly directly on the outside of the housing 1 frees up space inside, facilitating the installation of other structures.

[0021] In the above technical solution: Motor 2 is a computer-controlled motor. Motor 2 can be controlled by a programmable logic controller (PLC) through digital or analog input / output to collect the oscillation information of the feed tooth 8 and feed it back to the computer. Combined with feedback information from other modules such as the spindle and lifting foot, the computer performs comprehensive regulation and drive. Through this separate control and drive method, the drive structure and adjustment structure of the feeding component are combined and simplified. During repair or maintenance, the feeding component can be distinguished separately for targeted inspection and maintenance, which saves maintenance costs. The principle of PLC computer control of the motor is a mature existing technology that has been applied in the field of mechanical control and will not be elaborated here.

[0022] The feed dog drive mechanism of this sewing machine drives the feed dog 8 through a motor 2 and a feeding assembly. The motor 2 directly drives the feed dog 8, and the swing amplitude of the feed dog 8 can be adjusted by controlling the operation of the motor 2 through a computer. This achieves a combination and simplification of the drive structure and adjustment structure of the feed dog 8, and enables independent control and drive, making the adjustment more precise and reliable. The feeding assembly has a simple structure and stable transmission. The feeding assembly is located on the outside of the housing 1, avoiding the influence of the main shaft drive motor and the rotation of the main shaft. At the same time, it has significantly improved in terms of assembly deformability, lower noise, control efficiency, and control accuracy. In addition, the feeding assembly does not occupy the internal space of the housing 1, freeing up the space inside the housing 1 for the installation of other structures.

[0023] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

[0024] Although this document frequently uses terms such as housing 1; motor 2; fork crank 3; synchronous connecting rod 4; feeding swing arm 5; feeding connecting rod 6; feeding gear 7; feeding teeth 8; feeding swing arm shaft 9; fixing protrusion 10; fixing seat 11, the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any kind of additional limitation would contradict the spirit of this utility model.

[0025] Contents not described in detail herein are existing technologies known to those skilled in the art. The specific embodiments described herein are merely illustrative examples illustrating the spirit of this invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this invention or exceeding the scope defined by the appended claims.

Claims

1. A feed dog drive mechanism for a sewing machine, characterized in that... The device includes a housing (1), a motor (2), and a feeding assembly. The motor (2) is mounted on the side of the housing (1). The feeding assembly includes a fork-shaped crank (3), a synchronous connecting rod (4), a feeding swing rod (5), a feeding connecting rod (6), a feeding tooth frame (7), and a feeding tooth (8). The fork-shaped crank (3) is fixed to the output shaft of the motor (2). The ends of the fork-shaped crank (3) and the feeding swing rod (5) are connected by the synchronous connecting rod (4). The feeding swing rod (5) is provided with a feeding swing rod shaft (9). The side of the housing (1) is provided with two fixed protrusions (10). The two ends of the feeding swing rod shaft (9) are respectively hinged to the two fixed protrusions (10). The end of the feeding swing rod (5) is connected to the feeding tooth frame (7) by the feeding connecting rod (6). The feeding tooth (8) is mounted on the feeding tooth frame (7). The motor (2) drives the fork crank (3) to rotate, the synchronous connecting rod (4) drives and causes the feeding swing rod (5) to swing around the feeding swing rod shaft (9) as the center. The feeding swing rod (5) transmits the swing to the feeding tooth frame (7) and the feeding tooth (8) through the feeding connecting rod (6).

2. The feed dog drive mechanism of a sewing machine according to claim 1, characterized in that... The feeding assembly is located on the outside of the housing (1).

3. The feed dog drive mechanism of a sewing machine according to claim 1, characterized in that... The output shaft of the motor (2) is parallel to the length direction of the housing (1).

4. The feed dog drive mechanism of a sewing machine according to claim 1, characterized in that... The fixing protrusion (10) is integrally formed with the housing (1).

5. The feed dog drive mechanism of a sewing machine according to claim 1, characterized in that... A mounting base (11) is provided on the outer side of the housing (1), and the motor (2) is fixed on the mounting base (11).

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