Bottom thread knotting mechanism of sewing machine

Abstract

The utility model relates to the technical field of sewing equipment, in particular to a bottom thread knotting mechanism of a sewing machine. The problem that manual thread end binding in factory decoration stitch sewing is labor-consuming and time-consuming is solved. According to the technical scheme, the knotting and thread trimming device comprises a knotting and thread trimming mechanism, a motor mechanism and a mounting plate assembly. The knotting and thread trimming mechanism is fixed on a base supporting plate of the mounting plate assembly; the motor mechanism comprises a motor, a long connecting rod and a short connecting rod, the motor is arranged on the motor mounting plate, the long connecting rod and the short connecting rod are vertically arranged in a staggered mode and connected through a second pin, the short connecting rod is fixed to a motor shaft of the motor through a second jackscrew, and the motor mechanism is fixed to the base supporting plate of the mounting plate assembly through screws.

Description

Technical Field

[0001] This utility model relates to the field of sewing equipment technology, specifically to a sewing machine bobbin knotting mechanism. Background Technology

[0002] Currently, in the field of thick material sewing, to improve the aesthetics of decorative stitches, especially in automotive seat cover decorative stitching, certain processes require that reinforcing stitches not appear at the beginning and end of the seam, and that loose threads are strictly prohibited. To meet these requirements, factories currently use manual knotting for both the beginning and end of the seam, resulting in each seat cover production line requiring 2-3 workers. This is inefficient, time-consuming, and labor-intensive, and manual operation is prone to occasional loose threads and missed knots. Although some cylinder-controlled knotting mechanisms exist, cylinder control is affected by air pressure, leading to inconsistent thread cutting. Utility Model Content

[0003] In view of this, in order to solve the problem of labor-intensive and time-consuming manual tying of thread ends in factory decorative stitch sewing, this utility model provides a sewing machine bobbin knotting mechanism.

[0004] To address the problems existing in the prior art, the technical solution of this utility model is: a sewing machine thread knotting mechanism, characterized in that: it includes a knotting and thread-cutting mechanism, a motor mechanism, and a mounting plate assembly; the knotting and thread-cutting mechanism is fixed to the base support plate of the mounting plate assembly; the motor mechanism includes a motor, a long connecting rod, and a short connecting rod, the motor is mounted on the motor mounting plate, the long connecting rod and the short connecting rod are staggered vertically and connected by a pin, the short connecting rod is fixed to the motor shaft of the motor by a set screw, and the motor mounting plate of the motor mechanism is fixed to the base support plate of the mounting plate assembly.

[0005] Furthermore, the knotting and thread-cutting mechanism includes a pressure plate, a fixed blade, a thread-gripping spring, a moving blade, a mounting plate, a pressure plate, a slider, and a blade holder. The blade holder has a strip-shaped groove with a waist-shaped hole at the bottom. The slider is positioned within the groove and can slide within it. The slider has a hole through which a pin passes. The pin passes through the waist-shaped hole in the blade holder and is fixed to the other end of a long connecting rod. The pressure plate is fixed above the blade holder. The thread-gripping spring is fixed to the pressure plate, and its pressure is adjusted by a set screw. The moving blade is positioned above the mounting plate and fixed to the slider. The fixed blade is positioned above the moving blade and fixed to the pressure plate. The blade holder is fixed above the base support plate. The pressure plate is positioned above the fixed blade and fixed to the pressure plate. The pressure of the fixed blade can be adjusted by a screw, thereby adjusting the pressure between the fixed blade and the moving blade, making thread cutting smoother.

[0006] Furthermore, the mounting plate assembly includes a base and a base support plate vertically disposed on the base, wherein the base support plate is T-shaped.

[0007] Furthermore, the motor mounting plate is positioned above the motor.

[0008] Compared with the prior art, the advantages of this utility model are as follows:

[0009] 1. This utility model uses a motor to drive the actuator, and the thread gripping spring and fixed blade work together to clamp the thread head, thereby clamping the thread head and cutting off the excess thread length.

[0010] 2. This utility model adopts motor drive, which is not affected by air pressure, making the entire structure run more smoothly, with fast response speed and higher control precision. It can adapt to different working environments and working requirements, and can be parameterized.

[0011] 3. This utility model can reduce the size of the bird's nest on the bottom line, make the stitches more beautiful, improve the stability of the starting stitch, and ensure that there are no missed stitches or skipped stitches during the starting stitch.

[0012] 4. This utility model can reduce labor costs, lower the scrap rate, eliminate the phenomenon of manual omissions and mis-tying, and improve sewing efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] Figure 2 This is an exploded view of this utility model.

[0015] Figure 3 This is an exploded view of the knotting and thread-cutting mechanism of this utility model.

[0016] Figure 4 This is an exploded view of the cylinder mechanism of this utility model.

[0017] Figure 5 This is an exploded view of the mounting plate assembly of this utility model.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1: Knotting and wire cutting mechanism; 2: Motor mechanism; 3: Mounting plate assembly;

[0020] 1-1. Screw 1, 1-2. Pressure Plate 1, 1-3. Fixed Blade, 1-4. Screw 2, 1-5. Wire Grip Spring, 1-6. Screw 3, 1-7. Moving Blade, 1-8. Screw 4, 1-9. Mounting Plate, 1-10. Pressure Plate 2, 1-11. Set Screw 1, 1-12. Screw 5, 1-13. Pin 1, 1-14. Slider, 1-15. Blade Holder, 1-16. Screw 6;

[0021] 2-1. Pin 2; 2-2. Long connecting rod; 2-3. Short connecting rod; 2-4. Set screw 2; 2-5. Motor mounting plate; 2-6. Motor; 2-7. Screw 7.

[0022] 3-1. Base support plate; 3-2. Screw 8; 3-3. Base; 3-4. Screw 9. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] This embodiment provides a sewing machine thread knotting mechanism, including a knotting and thread-cutting mechanism 1, a motor mechanism 2, and a mounting plate assembly 3; as shown... Figure 1 and Figure 2 As shown; the knotting and cutting mechanism 1 is fixed to the base support plate 3-1 of the mounting plate assembly 3 by screws six 1-16; the motor mounting plate 2-6 of the motor mechanism 2 is fixed to the base support plate 3-1 of the mounting plate assembly 3 by screws eight 3-2.

[0025] like Figure 3 As shown, the knotting and thread-cutting mechanism 1 includes a pressure plate 1-2, an adjustable fixed blade 1-3, a thread-gripping spring 1-5, a moving blade 1-7, a mounting plate 1-9, a pressure plate 2-10, a slider 1-14, and a blade holder 1-15. The blade holder 1-15 is fixed above the base support plate 3-1 by screws 1-16. The slider 1-14 has a pin hole with a pin 13 inside. The blade holder 1-15 has a groove with a waist-shaped hole at the bottom. The slider 1-14 is placed in the groove of the blade holder 1-15 and flush with it. The pin 1-13 passes through the pin hole on the slider 1-14 and the waist-shaped hole in the groove of the blade holder 1-15, and is fixed in the hole at one end of the long connecting rod 2-2. The slider 1-14 can slide within the waist-shaped hole. The pressure plate 2-10 is fixed above the blade holder 1-15 by screws 1-12. The moving blade 1-7 is positioned above the mounting plate 1-9 and fixed to the slider 1-14 by screw four 1-8; the fixed blade 1-3 is positioned above the moving blade 1-7 and fixed to the pressure plate two 1-10 by screw two 1-4; the pressure plate one 1-2 is positioned above the fixed blade 1-3 and fixed to the pressure plate two 1-10 by screw 1-1; the wire gripping spring 1-5 is fixed to the pressure plate two 1-10 by screw three 1-6, and the pressure of the wire gripping spring 1-5 can be adjusted by the set screw one 1-11; the pressure of the fixed blade 1-3 can be adjusted by screw one 1-1, thereby adjusting the pressure between the fixed blade 1-3 and the moving blade 1-7, making the wire cutting smoother.

[0026] like Figure 4As shown, the motor mechanism 2 includes a motor 2-6, a long connecting rod 2-2, and a short connecting rod 2-3. The motor 2-6 is located below the motor mounting plate 2-5 and connected to it by screw 2-7. The long connecting rod 2-2 and the short connecting rod 2-3 are staggered vertically and connected by pin 2-1. The short connecting rod 2-3 is fixed to the motor shaft of the motor 2-6 by set screw 2-4. The motor mechanism 2 is fixed to the base support plate 3-1 of the mounting plate assembly 3 by screw 3-2. The other end of the long connecting rod 2-2 is connected to the knotting and wire cutting mechanism 1 by pin 1-13.

[0027] like Figure 5 The mounting plate assembly 3 includes a base 3-3 and a base support plate 3-1. The base support plate 3-1 is vertically fixed to the base 3-3 with screws 3-4 and screws 3-2 fix the motor mounting plate 2-5 to the base support plate 3-1.

[0028] The working process of this utility model:

[0029] When sewing begins, motor 2-6 rotates at a certain angle, driving short connecting rod 2-13 to rotate, which in turn drives pin 2-1, connected to long connecting rod 2-2, to rotate. This causes pin 1-13 to move linearly, causing slider 1-14 to extend moving blade 1-7. The thread passes through the cutting edge in front of moving blade 1-7. Motor 2-6 rotates at a certain angle again, causing the cutting edge of moving blade 1-7 to retract below the thread-grabbing spring 1-5. The thread is then clamped between moving blade 1-7 and the thread-grabbing spring 1-5. Motor 2-6 rotates at a certain angle again, causing moving blade 1-7 to retract. Moving blade 1-7 and fixed blade 1-3 cut the thread, completing one thread clamping and cutting action.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model.

Claims

1. A sewing machine bobbin knotting mechanism, characterized in that: The assembly includes a knotting and cutting mechanism (1), a motor mechanism (2), and a mounting plate assembly (3). The knotting and cutting mechanism (1) is fixed on the base support plate (3-1) of the mounting plate assembly (3). The motor mechanism (2) includes a motor (2-6), a long connecting rod (2-2), and a short connecting rod (2-3). The motor (2-6) is mounted on the motor mounting plate (2-5). The long connecting rod (2-2) and the short connecting rod (2-3) are staggered vertically and connected by pin two (2-1). The short connecting rod (2-3) is fixed to the motor shaft of the motor (2-6) by set screw two (2-4). The motor mounting plate (2-5) of the motor mechanism (2) is fixed on the base support plate (3-1) of the mounting plate assembly (3).

2. The sewing machine bobbin knotting mechanism according to claim 1, characterized in that: The knotting and thread-cutting mechanism (1) includes a pressure plate (1-2), a fixed blade (1-3), a thread-gripping spring (1-5), a moving blade (1-7), a mounting plate (1-9), a pressure plate (1-10), a slider (1-14), and a blade holder (1-15). The blade holder (1-15) has a strip-shaped groove with a waist-shaped hole at the bottom. The slider (1-14) is positioned within the groove and can slide within it. The slider (1-14) has a hole through which a pin (1-13) passes. The pin (1-13) passes through the blade holder (1-15). The waist-shaped hole is fixed to the other end of the long connecting rod (2-2), and the pressure plate two (1-10) is fixed above the knife holder (1-15); the wire gripping spring (1-5) is fixed on the pressure plate two (1-10), and the pressure of the wire gripping spring (1-5) is adjusted by the set screw one (1-11); the moving knife (1-7) is set above the mounting plate (1-9) and fixed on the slider (1-14), the fixed knife (1-3) is set above the moving knife (1-7) and fixed on the pressure plate two (1-10), the knife holder (1-15) is fixed above the base support plate (3-1), the pressure plate one (1-2) is set above the fixed knife (1-3) and fixed on the pressure plate two (1-10), and the pressure of the fixed knife (1-3) can be adjusted by the screw one (1-1), thereby adjusting the pressure between the fixed knife (1-3) and the moving knife (1-7) to make the wire cutting smoother.

3. The sewing machine bobbin knotting mechanism according to claim 1, characterized in that: The mounting plate assembly (3) includes a base (3-3) and a base support plate (3-1) vertically disposed on the base (3-3), wherein the base support plate (3-1) is T-shaped.

4. A sewing machine bobbin knotting mechanism according to claim 2 or 3, characterized in that: The motor mounting plate (2-5) is located above the motor (2-6).

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