Hidden quilt production industrial sewing machine speed regulator and hidden quilt production machine

By designing a speed controller for industrial sewing machines using concealed quilting, and employing a structure including a mounting base, rotating frame, and magnet components, the problems of difficult installation and high cost of existing speed controllers are solved, achieving improved stability and adaptability, and facilitating mass production.

CN117845448BActive Publication Date: 2026-05-12YANTAI ZHONGLIAN IND CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
YANTAI ZHONGLIAN IND CO LTD
Filing Date
2024-01-25
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

Existing industrial sewing machine speed controllers are bulky, difficult to install, and cannot be adjusted in terms of installation position and direction according to actual needs. Their complex internal structure leads to high production costs.

Method used

A speed controller for industrial sewing machines used in concealed quilting production was designed. The mounting base is divided into horizontal and vertical parts. Combined with a rotating frame, incomplete gears, magnetic steel components and Hall elements, it can achieve multi-directional installation and stability adjustment. The motor speed is controlled by a sensing component, simplifying the internal structure.

Benefits of technology

It achieves stable installation of the speed controller, is suitable for different models of sewing machines, reduces production costs, facilitates mass production, and improves the adaptability and installation stability of the device.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application discloses a hidden cover production industrial sewing machine speed regulator, which comprises a mounting seat, a base is mounted on the outer side wall of the mounting seat, a plurality of threaded mounting holes are uniformly formed in the base, a through groove is formed in the mounting seat, a rotating frame is rotationally connected in the mounting seat, a placing frame is fixedly connected in the mounting seat, and a moving frame is slidably connected to the placing frame and the mounting seat. The application further discloses a hidden cover production machine, which comprises a base, a plurality of support rods are vertically arranged on the upper surface of the base, the upper ends of two adjacent support rods are jointly provided with a connecting rod, and two cross rods are jointly arranged between the two connecting rods. The application has the advantages of ingenious structure, convenient use, small size, high installation stability, suitability for different types and models of industrial sewing machines, convenience in adjusting the position and direction of installation, convenience in batch production and reduction of production cost to a certain extent.
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Description

Technical Field

[0001] This invention relates to the field of industrial sewing machine technology, and more particularly to a speed regulator for an industrial sewing machine used in the production of concealed quilts and a concealed quilt production machine. Background Technology

[0002] Bedding commonly used in daily life often features quilting. Taking quilts as an example, quilts generally consist of two parts: the filling material and the outer textile. The filling material can be further divided into wadding and loose fiber. Loose fiber quilt fillings have an irregular structure and shape, are prone to shifting and shrinking, and have uneven thickness. To ensure a tight fit between the outer fabric and the inner core of a quilt, and to maintain a uniform thickness, the outer fabric and the inner core are sewn together in parallel straight lines or decorative patterns. This process, which enhances both aesthetics and practicality, is called quilting. Quilts or mattresses that have undergone this sewing process are called quilted quilts or quilted mattresses. The stitches created using the quilting process are also referred to as quilting. Industrial sewing machines are indispensable in the quilting process. Unlike household sewing machines, industrial sewing machines utilize motors and other drive devices to achieve automatic sewing. Therefore, speed controllers are essential in industrial sewing machines. The speed control principles of various speed controllers are basically similar. Consequently, the ease of production, signal stability, and cost control of speed controllers have become a focus of attention.

[0003] Existing speed controllers are large in size, difficult to install, and cannot be adjusted in position and direction according to actual usage needs. Their complex internal structure increases the difficulty of the manufacturing process, resulting in high production costs.

[0004] To address these issues, we propose a speed controller for industrial sewing machines used in concealed quilt production and a concealed quilt production machine. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the prior art, and to propose a speed regulator for industrial sewing machines used in the production of concealed quilts and a concealed quilt production machine.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A speed controller for industrial sewing machines using concealed quilting includes a mounting base. A base is mounted on the outer wall of the mounting base. The base has a plurality of threaded mounting holes evenly distributed on it. A through groove is formed on the mounting base. A rotating frame is rotatably connected inside the mounting base. A placement frame is fixedly connected inside the mounting base. A movable frame is slidably connected to both the placement frame and the mounting base. A pushing component is mounted between the movable frame and the rotating frame. A magnet component is mounted on the movable frame. A sensing component is mounted on the mounting base, and the position of the sensing component corresponds to the position of the magnet component.

[0008] In the aforementioned hidden quilting industrial sewing machine speed controller, the pushing component includes an incomplete gear, and an incomplete gear is mounted on the rotating frame. A guide post is fixedly connected to the moving frame, and the guide post passes through the placement frame and is fixedly connected to a toothed plate, which meshes with the incomplete gear.

[0009] In the aforementioned hidden quilting industrial sewing machine speed controller, the placement frame is provided with a first limiting groove, the mounting base is provided with a second limiting groove, and the movable frame is slidably connected in the first limiting groove and the second limiting groove, and the distance between the two inner walls of the first limiting groove is less than the distance between the two inner walls of the second limiting groove.

[0010] In the aforementioned hidden quilting manufacturing industrial sewing machine speed controller, a first return spring is installed between the moving frame and the placement frame.

[0011] In the aforementioned hidden quilting sewing machine speed controller, a first support is installed on the inner side wall of the mounting base, and a second support is installed on the side wall of the rotating frame. A second return spring is installed between the first support and the second support.

[0012] In the aforementioned hidden quilting industrial sewing machine speed controller, the magnet assembly includes a support base, which is fixedly connected to a movable frame. The support base has a support groove, and a magnet body is installed in the support groove, with an interference fit between the magnet body and the inner wall of the support groove.

[0013] In the aforementioned hidden quilting industrial sewing machine speed controller, the sensing component consists of a fixed frame and a Hall element. The fixed frame is mounted on the surface of the mounting base by locking screws, and the Hall element is mounted on the surface of the fixed frame opposite to the mounting base, with the Hall element corresponding to the position of the magnet assembly.

[0014] In the aforementioned hidden quilting industrial sewing machine speed controller, the fixing frame consists of two L-shaped plates and a horizontal plate, with the horizontal plate connected between the two L-shaped plates. Each L-shaped plate is mounted on a mounting base by a locking screw, and the Hall element is mounted on the horizontal plate.

[0015] In the aforementioned hidden quilting sewing machine speed controller, the mounting base is divided into a horizontal mounting part and a vertical mounting part, with the vertical mounting part being vertically disposed at one end of the horizontal mounting part.

[0016] The concealed quilting production machine includes a base, on the upper surface of which multiple support rods are vertically arranged. The upper ends of two adjacent support rods are connected by a connecting rod, and two crossbars are connected between the two connecting rods. A sliding frame is slidably connected to the two crossbars.

[0017] A rack is installed on the side wall of one of the crossbars, a motor is installed on the sliding frame, and a moving gear is installed on the output shaft of the motor, and the moving gear meshes with the rack.

[0018] A movable seat is slidably connected to the sliding frame. A rack is installed on one side wall of the sliding frame. A motor is installed on the upper surface of the movable seat. A movable gear is installed on the output shaft of the motor and meshes with the rack.

[0019] A moving rod is vertically slidably connected to the moving base. A quilting machine is installed at the lower end of the moving rod. A rack three is installed on the side wall of the moving rod. A third support is installed on the upper surface of the moving base. A motor three is installed on the third support. A moving gear three is installed on the output shaft of the motor three, and the moving gear three meshes with the rack three.

[0020] The upper end face of the sliding frame is symmetrically provided with two limiting seats, and the side wall of the moving rod is symmetrically provided with two limiting rods, and each limiting rod is slidably connected to the corresponding limiting seat.

[0021] Compared with existing technologies, the beneficial effects of the present invention are as follows:

[0022] 1. The horizontal and vertical mounting sections on the mounting base enable multi-directional installation, ensuring the stability of the mounting base. It is also suitable for different types and models of industrial sewing machines, and the installation position and direction can be adjusted according to actual needs, thus improving the adaptability of the device.

[0023] 2. The rotating frame, incomplete gear, toothed plate, and guide column enable the moving frame to reciprocate while the rotating frame rotates. The first limiting groove, the second limiting groove, and the moving frame ensure that the magnet assembly can reciprocate along with the moving frame in the direction of the first limiting groove. The Hall element senses the change in the magnetic field strength at the sensing point caused by the movement of the magnet, outputs a corresponding analog signal, and transmits it to the sewing machine controller. The controller controls the output rate of the motor to achieve speed adjustment of the sewing machine.

[0024] 3. The guide column, the first limiting groove, and the second limiting groove enable the moving frame to drive the guide column to slide on the placement frame, ensuring the stability of the moving frame during reciprocating motion, and thus ensuring the stability of the magnet assembly during reciprocating motion.

[0025] 4. The through slot on the mounting base can limit the maximum angle of rotation of the rotating frame, preventing the first or second return spring from being stretched too much when the pull rod drives the rotating frame to rotate, which would cause the spring to fail and damage the device.

[0026] 5. The height of the quilting machine is adjusted by the motor, moving gear, rack, and moving rod to ensure that the quilting machine will not affect the installation of the concealed quilt. At the same time, the different feed depths of the quilting machine and the concealed quilt can be adjusted to achieve the versatility of the device.

[0027] 6. The quilting machine can move on a plane parallel to the base by means of motor one, moving gear one, rack one, motor two, moving gear two, and rack two, which can sew different positions of the quilt and ensure that the quilt in different positions can be sewn.

[0028] In summary, this invention has a clever structure, is easy to use, has a small size, and is highly stable during installation. It is suitable for different types and models of industrial sewing machines, and it is easy to adjust the installation position and direction, which facilitates mass production and reduces production costs to a certain extent. Attached Figure Description

[0029] Figure 1 This is a visual diagram of the speed controller for industrial sewing machines used in the production of concealed quilting, as proposed in this invention.

[0030] Figure 2 This is a visual representation of another perspective of the speed controller for industrial sewing machines used in the production of concealed quilting, as proposed in this invention.

[0031] Figure 3 This is a schematic diagram of the speed controller for industrial sewing machines used in the production of concealed quilting, as proposed in this invention.

[0032] Figure 4 This is an enlarged view of the incomplete gear section structure in the speed controller of an industrial sewing machine for concealed quilting production, as proposed in this invention.

[0033] Figure 5 This is an enlarged view of the moving frame section in the speed controller of an industrial sewing machine for concealed quilting production, as proposed in this invention.

[0034] Figure 6 This is a schematic diagram of the structure of the hidden quilting production machine proposed in this invention;

[0035] Figure 7 This is an enlarged view of the sliding frame structure in the concealed quilting production machine proposed in this invention.

[0036] In the diagram: 1 Mounting base, 2 Base, 3 Threaded mounting hole, 4 Rotating frame, 5 Through slot, 6 Fixed frame, 7 Hall element, 8 Second limiting slot, 9 Placement frame, 10 First limiting slot, 11 Moving frame, 12 First return spring, 13 Guide column, 14 Tooth plate, 15 Incomplete gear, 16 Second support, 17 Second return spring, 18 First support, 19 Support seat, 20 Magnet body, 21 Base, 22 Support rod, 23 Crossbar, 24 Motor III, 25 Sliding frame, 26 Rack III, 27 Moving gear III, 28 Limiting seat, 29 Motor II, 30 Moving gear II, 31 Rack II, 32 Connecting rod, 33 Limiting rod, 34 Moving rod, 35 Moving seat, 36 Third support, 37 Motor I, 38 Rack I, 39 Moving gear I, 40 Quilting machine. Detailed Implementation

[0037] The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0038] Example

[0039] Reference Figure 1-5 The hidden quilting is used to manufacture industrial sewing machine speed controllers, including a mounting base 1. The mounting base 1 is divided into a horizontal mounting part and a vertical mounting part. The vertical mounting part is vertically set at one end of the horizontal mounting part, which can realize multi-directional installation of the mounting base, ensure the stability of the mounting base 1, and be applicable to different types and models of industrial sewing machines. The installation position and direction can be adjusted according to actual needs, thereby improving the compatibility of the device.

[0040] A base 2 is installed on the outer side wall of the mounting base 1. Several threaded mounting holes 3 are evenly opened on the base 2. A through groove 5 is opened on the mounting base 1. The through groove 5 can limit the maximum angle of rotation of the rotating frame 4, so as to prevent the first return spring 12 or the second return spring 17 from being stretched too long when the pull rod drives the rotating frame 4 to rotate, which would cause the spring to fail and damage the device. The rotating frame 4 is rotatably connected inside the mounting base 1. A first support 18 is installed on the inner side wall of the mounting base 1. A second support 16 is installed on the side wall of the rotating frame 4. A second return spring 17 is installed between the first support 18 and the second support 16.

[0041] A placement frame 9 is fixedly connected inside the mounting base 1. A movable frame 11 is slidably connected to both the placement frame 9 and the mounting base 1. A first return spring 12 is installed between the movable frame 11 and the placement frame 9. A first limiting groove 10 is provided on the placement frame 9, and a second limiting groove 8 is provided on the mounting base 1. The movable frame 11 is slidably connected in the first limiting groove 10 and the second limiting groove 8. The distance between the two inner walls of the first limiting groove 10 is less than the distance between the two inner walls of the second limiting groove 8, which ensures the stability of the movable frame 11 during reciprocating motion, thereby ensuring the stability of the magnet assembly during reciprocating motion.

[0042] A pushing assembly is installed between the movable frame 11 and the rotating frame 4. The pushing assembly includes an incomplete gear 15, and the rotating frame 4 is also equipped with an incomplete gear 15. A guide post 13 is fixedly connected to the movable frame 11. The guide post 13 passes through the placement frame 9 and is fixedly connected to a toothed plate 14, and the toothed plate 14 meshes with the incomplete gear 15.

[0043] A magnet assembly is installed on the mobile frame 11. The magnet assembly includes a support 19, which is fixedly connected to the mobile frame 11. A support groove is provided on the support 19, and a magnet 20 is installed in the support groove. The magnet 20 is interference-fitted with the inner wall of the support groove, which makes it easy to replace the magnet 20 after it fails, without having to replace the entire device or magnet assembly, thus reducing maintenance difficulty and maintenance cost.

[0044] The mounting base 1 is equipped with a sensing component, and the position of the sensing component corresponds to the position of the magnet component. The sensing component consists of a fixing frame 6 and a Hall element 7. The fixing frame 6 is mounted on the surface of the mounting base 1 by locking screws. The Hall element 7 is mounted on the surface of the fixing frame 6 opposite to the mounting base 1, and the position of the Hall element 7 corresponds to the position of the magnet component. The fixing frame 6 consists of two L-shaped plates and a horizontal plate, and the horizontal plate is connected between the two L-shaped plates. Each L-shaped plate is mounted on the mounting base 1 by locking screws, and the Hall element 7 is mounted on the horizontal plate.

[0045] In use, the mounting base 1 is installed on the sewing machine table by locking screws. The rotating frame 4 is connected to the sewing machine pedal by a pull rod. The rotating frame 4 rotates up and down under the drive of the pull rod. When the rotating frame 4 rotates, the second return spring 17 is stretched or compressed. At the same time, the incomplete gear 15 on the rotating frame 4 also moves. When the rotating frame 4 drives the incomplete gear 15 to rotate, the incomplete gear 15 drives the guide column 13 to move through the toothed plate 14. The guide column 13 drives the moving frame 11 to slide on the placement frame 9. The first return spring 12 is compressed or stretched, thereby realizing the reciprocating motion of the moving frame 11 in the first limiting groove 10 and the second limiting groove 8.

[0046] When the moving frame 11 reciprocates within the first limiting groove 10 and the second limiting groove 8, the support seat 19 reciprocates accordingly, and the magnet 20 reciprocates along the direction of the first limiting groove 10. The Hall element 7 senses the change in the magnetic field strength at the sensing point caused by the movement of the magnet 20, outputs a corresponding analog signal and transmits it to the controller of the sewing machine. The controller controls the output rate of the motor to achieve speed adjustment of the sewing machine.

[0047] During the rotation of the rotating frame 4 toward the vertical mounting part, if the first return spring 12 and the second return spring 17 have returned to their original lengths, and the rotating frame 4 continues to rotate toward the vertical mounting part due to inertia or other reasons, the incomplete gear 15 drives the guide column 13 to move away from the vertical mounting part through the toothed plate 14. The second return spring 17 extends, and the first return spring 12 is compressed. When the pull rod drives the rotating frame 4 to move away from the vertical mounting part again, the first return spring 12 and the second return spring 17 gradually return to their original lengths. The first return spring 12 and the second return spring 17 can assist the pull rod in accelerating the rotation speed of the rotating frame 4.

[0048] refer to Figure 6-7 The concealed quilting production machine includes a base 21. Multiple support rods 22 are vertically arranged on the upper surface of the base 21. A connecting rod 32 is installed on the upper end of two adjacent support rods 22. Two crossbars 23 are installed between the two connecting rods 32. A sliding frame 25 is slidably connected to the two crossbars 23.

[0049] A rack 38 is installed on the side wall of one of the crossbars 23, a motor 37 is installed on the sliding frame 25, and a moving gear 39 is installed on the output shaft of the motor 37, and the moving gear 39 meshes with the rack 38.

[0050] A movable seat 35 is slidably connected to the sliding frame 25. A rack 31 is installed on one side wall of the sliding frame 25. A motor 29 is installed on the upper surface of the movable seat 35. A movable gear 30 is installed on the output shaft of the motor 29, and the movable gear 30 meshes with the rack 31.

[0051] A moving rod 34 is vertically slidably connected to the moving base 35. A quilting machine 40 is installed at the lower end of the moving rod 34. A rack 36 is installed on the side wall of the moving rod 34. A third support 36 is installed on the upper surface of the moving base 35. A motor 34 is installed on the third support 36. A moving gear 37 is installed on the output shaft of the motor 34, and the moving gear 327 meshes with the rack 326.

[0052] The upper end face of the movable seat 25 is symmetrically provided with two limiting seats 28, and the side wall of the movable rod 34 is symmetrically provided with two limiting rods 33, and each limiting rod 33 is slidably connected to the corresponding limiting seat 28.

[0053] Turn on motor 324. Motor 324 drives moving gear 327 to rotate. Moving gear 327 meshes with rack 326. Since moving gear 327 is fixed, rack 326 drives moving rod 34 to move vertically, adjusting the position of quilting machine 40 until the lower end of quilting machine 40 contacts the quilted quilt. At the same time, motor 324, moving gear 327, rack 326, and moving rod 34 drive quilting machine 40 to quilt the quilted quilt. When adjusting the position of quilting machine 40 along the X-axis upward, turn on motor 137. The output shaft of motor 137 drives moving gear 139 to rotate. Moving gear 139 meshes with rack 138. Since rack 138 is fixedly set on the side of crossbar 23... On the wall, the moving gear 39 drives the sliding frame 25 to move on the crossbar 23. When adjusting the position of the quilting machine 40 along the Y-axis, the motor 29 is turned on. The output shaft of the motor 29 drives the moving gear 30 to rotate. The moving gear 30 meshes with the rack 31. Since the rack 31 is fixedly set on the side wall of the sliding frame 25, the moving gear 30 drives the moving seat 7 to move in the direction of the sliding frame 25. The arrangement of the motor 37, moving gear 39, rack 38, motor 29, moving gear 30 and rack 31 enables the quilting machine 40 to move on a plane parallel to the base 21, thereby facilitating the quilting machine 40 to sew different positions of the quilt.

[0054] Although this article uses a lot of terms such as mounting base 1, base 2, threaded mounting hole 3, rotating frame 4, through groove 5, fixed frame 6, Hall element 7, second limiting groove 8, placement frame 9, first limiting groove 10, moving frame 11, first return spring 12, guide column 13, toothed plate 14, incomplete gear 15, second support 16, second return spring 17, first support 18, support seat 19, magnet body 20, base 21, support rod 22, crossbar 23, motor three 24, sliding frame 25, rack three 26, moving gear three 27, limiting seat 28, motor two 29, moving gear two 30, rack two 31, connecting rod 32, limiting rod 33, moving rod 34, moving seat 35, third support 36, motor one 37, rack one 39, moving gear one 39, quilting machine 40, etc., the possibility of using other terms cannot be ruled out. The use of these terms is merely for the convenience of describing and explaining the nature of the invention; interpreting them as any additional limitation would be contrary to the spirit of the invention.

Claims

1. A speed controller for sewing machines used in the production of concealed quilting, comprising a mounting base (1), characterized in that: A base (2) is installed on the outer wall of the mounting base (1). Several threaded mounting holes (3) are evenly opened on the base (2). A through groove (5) is opened on the mounting base (1). A rotating frame (4) is rotatably connected inside the mounting base (1). A placement frame (9) is fixedly connected inside the mounting base (1). A movable frame (11) is slidably connected to the placement frame (9) and the mounting base (1). A pushing component is installed between the movable frame (11) and the rotating frame (4). A magnet assembly is installed on the movable frame (11). A sensing component is installed on the mounting base (1), and the position of the sensing component corresponds to the position of the magnet assembly. The placement rack (9) is provided with a first limiting groove (10), the mounting base (1) is provided with a second limiting groove (8), and the movable frame (11) is slidably connected in the first limiting groove (10) and the second limiting groove (8), and the distance between the two inner walls of the first limiting groove (10) is less than the distance between the two inner walls of the second limiting groove (8). The magnet assembly includes a support (19), and the support (19) is fixedly connected to the movable frame (11). The support (19) has a support groove, and a magnet (20) is installed in the support groove. The magnet (20) and the inner wall of the support groove are interference fit. The sensing component consists of a mounting bracket (6) and a Hall element (7). The mounting bracket (6) is mounted on the surface of the mounting base (1) by locking screws. The Hall element (7) is mounted on the surface of the mounting bracket (6) opposite to the mounting base (1), and the Hall element (7) corresponds to the position of the magnet assembly.

2. The speed controller for industrial sewing machines used in the production of concealed quilting as described in claim 1, characterized in that: The pushing component includes an incomplete gear (15), and the incomplete gear (15) is mounted on the rotating frame (4). A guide column (13) is fixedly connected to the moving frame (11). The guide column (13) passes through the placement frame (9) and is fixedly connected to a toothed plate (14), and the toothed plate (14) meshes with the incomplete gear (15).

3. The speed controller for industrial sewing machines used in the production of concealed quilting as described in claim 1, characterized in that: A first return spring (12) is installed between the movable frame (11) and the placement frame (9).

4. The speed controller for industrial sewing machines used in the production of concealed quilting as described in claim 1, characterized in that: A first support (18) is installed on the inner side wall of the mounting base (1), and a second support (16) is installed on the side wall of the rotating frame (4). A second return spring (17) is installed between the first support (18) and the second support (16).

5. The speed controller for industrial sewing machines used in the production of concealed quilting as described in claim 1, characterized in that: The fixing frame (6) consists of two L-shaped plates and a horizontal plate, with the horizontal plate connected between the two L-shaped plates. Each L-shaped plate is mounted on the mounting base (1) by a locking screw, and the Hall element (7) is mounted on the horizontal plate.

6. The speed controller for industrial sewing machines used in the production of concealed quilting as described in claim 1, characterized in that: The mounting base (1) is divided into a horizontal mounting part and a vertical mounting part, with the vertical mounting part being vertically arranged at one end of the horizontal mounting part.

7. A concealed quilting production machine comprising a speed regulator for an industrial sewing machine for concealed quilting production as described in any one of claims 1-6, comprising a base (21), characterized in that: The upper surface of the base (21) is vertically provided with multiple support rods (22). The upper ends of two adjacent support rods (22) are connected by a connecting rod (32). Two crossbars (23) are connected between the two connecting rods (32). A sliding frame (25) is slidably connected to the two crossbars (23). A rack (38) is installed on the side wall of one of the crossbars (23), a motor (37) is installed on the sliding frame (25), a moving gear (39) is installed on the output shaft of the motor (37), and the moving gear (39) meshes with the rack (38). A movable seat (35) is slidably connected to the sliding frame (25). A rack two (31) is installed on one side wall of the sliding frame (25). A motor two (29) is installed on the upper surface of the movable seat (35). A movable gear two (30) is installed on the output shaft of the motor two (29), and the movable gear two (30) meshes with the rack two (31). A moving rod (34) is vertically slidably connected to the moving base (35). A quilting machine (40) is installed at the lower end of the moving rod (34). A rack three (26) is installed on the side wall of the moving rod (34). A third support (36) is installed on the upper surface of the moving base (35). A motor three (24) is installed on the third support (36). A moving gear three (27) is installed on the output shaft of the motor three (24), and the moving gear three (27) meshes with the rack three (26). The upper end face of the sliding frame (25) is symmetrically provided with two limiting seats (28), and the side wall of the moving rod (34) is symmetrically provided with two limiting rods (33), and each limiting rod (33) is slidably connected to the corresponding limiting seat (28).