Hidden sewing machine

Abstract

The technical scheme belongs to the technical field of concealed sewing machines, and particularly relates to a concealed sewing machine, which comprises a rack, a needle plate, a sewing machine, a sewing mechanism and a sewing mechanism, the thread trimming device comprises a scissor blade, the scissor blade is movably arranged above the needle plate, and the thread trimming device is used for receiving an external signal and controlling the scissor blade to perform thread trimming work; the presser foot lifting device comprises a presser foot assembly, the presser foot assembly is movably arranged below the needle plate, and the presser foot assembly can move close to the needle plate and is matched with the needle plate to clamp cloth; the presser foot lifting device comprises a presser foot lifting driving mechanism which comprises a presser foot lifting driving air cylinder and a presser foot lifting driving shaft, and the presser foot lifting driving air cylinder is used for driving the presser foot lifting driving shaft to rotate; the presser foot lifting transmission mechanism comprises a presser foot lifting rotating shaft and a presser foot lifting connecting rod group, and the presser foot lifting connecting rod group is used for receiving the rotating power of the presser foot lifting driving shaft and inputting the power to the presser foot lifting rotating shaft to enable the presser foot lifting rotating shaft to rotate; and the presser foot assembly is arranged at the rear end of the presser foot lifting rotating shaft.

Description

Technical Field

[0001] This technical solution relates to the field of blind seam sewing machine technology, and specifically refers to a blind seam sewing machine. Background Technology

[0002] The existing blind hem sewing machine, also known as a hem-flanging machine, is a type of sewing machine used to sew hems on the bottom of garments, cuffs, and trouser legs. Currently, the automatic presser foot uses an electromagnet, which generates significant vibration and noise during operation. Furthermore, the electromagnet is relatively large and inconvenient to install as a single unit.

[0003] Chinese patent CN201347494Y discloses a pneumatic lifting foot and thread cutting device for a blind stitch sewing machine. The transmission structure of the pneumatic lifting foot and thread cutting device of this blind stitch sewing machine is relatively complex. In particular, the pneumatic lifting foot device transmits power through a chain, which is inefficient and prone to failure. With the upgrading of blind stitch sewing machines, this transmission method is no longer applicable. Therefore, a more efficient transmission method is needed. Summary of the Invention

[0004] The purpose of this technical solution is to provide a blind stitch sewing machine that solves the problems of low transmission efficiency and complex transmission structure of the original blind stitch sewing machine by adjusting the installation position and cooperation method of the thread cutting device and the presser foot lifting device.

[0005] The purpose of this technical solution is achieved as follows:

[0006] A blind stitch sewing machine includes: a frame having a needle plate for supporting and guiding fabric; a thread-cutting device including scissor blades movably disposed above the needle plate, the thread-cutting device receiving external signals and controlling the scissor blades to perform thread-cutting operations; and a presser foot lifting device including a presser foot assembly movably disposed below the needle plate, the presser foot assembly being movable close to the needle plate and cooperating with the needle plate to clamp the fabric; wherein the presser foot lifting device includes: a presser foot lifting drive mechanism including a presser foot lifting drive cylinder and a presser foot lifting drive shaft disposed at the output end of the presser foot lifting drive cylinder, the presser foot lifting drive cylinder driving the presser foot lifting drive shaft to rotate; a presser foot lifting transmission mechanism including a presser foot rotating shaft and a presser foot connecting rod assembly, the presser foot connecting rod assembly receiving the rotational power of the presser foot driving shaft and inputting the power to the presser foot rotating shaft to make it rotate; and a presser foot assembly disposed at the rear end of the presser foot rotating shaft.

[0007] Preferably, the presser foot lifting drive mechanism further includes a curved drive connector, the front end of which is connected to the output end of the presser foot lifting drive cylinder, and the rear end is sleeved outside the presser foot lifting drive shaft for driving the presser foot lifting drive shaft to rotate; the presser foot lifting drive mechanism further includes a drive reset component and a reset connector, the reset connector is sleeved outside the presser foot lifting drive shaft, one end of the drive reset component is connected to the reset connector, and the other end is connected inside the frame.

[0008] Preferably, the presser foot lifting linkage assembly includes: a hinged rod, the middle of which is hinged to a rocker arm seat within the frame; a presser foot crank, the rear end of which is connected to the front end of the hinged rod, the front end of which is sleeved outside the presser foot lifting shaft; a presser foot bracket, the front end of which is connected to the rear end of the hinged rod via a presser foot connecting rod, the rear end of which is sleeved outside the presser foot lifting drive shaft; and a ball screw, which is movably mounted on the presser foot bracket for driving the presser foot connecting rod; wherein, the ball screw has a movable position, the presser foot connecting rod is movably mounted within this movable position, the hinged rod has an oblong hole, and the hinged rod is mounted on the rocker arm seat via a hinge pin.

[0009] Preferably, a pressure foot mounting plate is provided extending to the side from the front end of the pressure foot lifting shaft; the pressure foot assembly includes: a right pressure foot bracket, which is disposed on the pressure foot mounting plate, and the right pressure foot bracket is also disposed on the pressure foot lifting shaft by a right pressure foot screw; a right pressure foot portion, which is disposed on the right pressure foot bracket; a left pressure foot bracket, which is disposed on the pressure foot mounting plate, and the left pressure foot bracket is also disposed on the frame by a left pressure foot screw; and a left pressure foot portion, which is disposed on the left pressure foot bracket.

[0010] Preferably, the right pressure foot bracket and the left pressure foot bracket are respectively provided with a right pressure foot protrusion and a left pressure foot protrusion, which are mounted on the pressure foot mounting plate; the pressure foot assembly also includes a right pressure foot reset component and a left pressure foot reset component, one end of the right pressure foot reset component is connected to the right pressure foot bracket and the other end is connected to the machine frame; one end of the left pressure foot reset component is connected to the left pressure foot bracket and the other end is connected to the machine frame.

[0011] Preferably, the blind stitching machine also includes a diamond-shaped plate device, which includes a diamond-shaped plate drive mechanism and a diamond-shaped plate part. The diamond-shaped plate is driven to rise and fall by a rocker arm seat. The diamond-shaped plate part is located between the right presser foot part and the left presser foot part.

[0012] Preferably, the wire cutting device includes: a wire clamping mechanism disposed on the top surface of the frame; and a wire cutting mechanism disposed on the wire clamping mechanism; wherein the wire clamping mechanism includes: a wire clamping bracket having two oppositely disposed mounting ears forming a wire clamping mounting position between the two mounting ears; a wire guide plate disposed on the left side of the wire clamping mounting position, the front end of the wire guide plate having a wire through hole; a wire pressing cylinder disposed on the right side of the wire clamping mounting position; a wire pressing stationary plate disposed close to the wire guide plate; and a wire pressing movable plate disposed at the output end of the wire pressing cylinder for cooperating with the wire pressing stationary plate to clamp the wire.

[0013] Preferably, the wire cutting mechanism includes: a wire cutting cylinder disposed on the wire clamping bracket; and a scissor blade disposed at the output end of the wire cutting cylinder.

[0014] Preferably, the wire clamping bracket is bent downward to form a wire cutting mounting plate, and the wire cutting cylinder is mounted on the wire cutting mounting plate via a wire cutting mounting block; the wire clamping bracket has a wire-passing hole, and the scissor blade is movably positioned below the wire-passing hole.

[0015] The key and beneficial technical effects of this technical solution compared to existing technologies are:

[0016] 1. The thread-cutting device and presser foot lifting device designed in this technical solution differ from those of conventional sewing machines. The thread-cutting device is located above the needle plate, while the presser foot lifting device is located below the needle plate. This ensures that the presser foot assembly does not obstruct the sewing area, allowing the operator to better observe the sewing area. Furthermore, the thread-cutting device has both thread-pulling and cutting functions. The presser foot lifting device is driven by a presser foot linkage and a presser foot drive shaft. The power output from the presser foot drive cylinder causes the presser foot drive shaft to rotate, thereby enabling the presser foot assembly to operate.

[0017] 2. The lifting foot device designed in this technical solution transmits power to the pressing foot assembly through the lifting foot transmission mechanism. By sharing the swing arm seat transmission with the lifting foot device and the lifting disc device, the internal space of the blind sewing machine is saved, making its internal parts more compact. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this technical solution.

[0019] Figure 2 This is a schematic diagram of the wire-cutting device.

[0020] Figure 3 This is a schematic diagram of the lifting foot device and the lifting disc device.

[0021] Figure 4 This is a schematic diagram of the presser foot lifting device.

[0022] Figure 5Exploded view of the lifting foot connecting rod assembly.

[0023] Reference numerals: 1. Frame; 11. Needle plate; 12. Swing rod seat; 2. Thread cutting device; 21. Thread clamping mechanism; 211. Thread clamping bracket; 212. Mounting ear; 213. Thread clamping mounting position; 214. Thread guide plate; 215. Thread threading hole; 216. Thread pressing cylinder; 217. Thread pressing stationary plate; 218. Thread pressing moving plate; 22. Thread cutting mechanism; 221. Thread cutting cylinder; 222. Thread cutting mounting block; 223. Scissors blade; 224. Thread cutting mounting plate; 225. Thread passing hole; 3. Presser foot lifting device; 31. Presser foot lifting drive cylinder; 32. Presser foot lifting drive shaft; 321. Drive connector; 322. Drive reset component; 323. 33. Reset connector; 34. Presser foot lifting shaft; 35. Presser foot lifting linkage assembly; 36. Hinged rod; 37. Presser foot crank; 38. Presser foot bracket; 39. Presser foot connecting rod; 30. Presser foot mounting plate; 31. Ball position screw; 32. Presser foot assembly; 33. Right presser foot bracket; 34. Right presser foot screw; 35. Right presser foot part; 36. Left presser foot bracket; 37. Left presser foot screw; 38. Left presser foot part; 39. Right presser foot reset component; 30. Left presser foot reset component; 40. Rhomboid lifting disc device; 41. Rhomboid lifting disc drive mechanism; 42. Rhomboid lifting disc part. Detailed Implementation

[0024] The specific implementation of this technical solution will be further described in detail below with reference to the accompanying drawings.

[0025] like Figure 1-5 As shown, a blind stitch sewing machine includes a frame 1, a thread cutting device 2, a presser foot lifting device 3, and a rhombus lifting disc device 4. The frame 1 has a needle plate 11, which is used to support and guide the fabric. The thread cutting device 2 is located above the needle plate 11 and includes scissor blades 223, which are used to receive external signals and control the scissor blades 223 to perform thread cutting. The presser foot lifting device 3 is located below the needle plate 11 and includes a presser foot assembly 35, which is used to move close to the needle plate 11 and cooperate with the needle plate 11 to clamp the fabric. Both the thread cutting device 2 and the presser foot lifting device 3 are controlled by solenoid valves, which control the opening and closing of the corresponding driving components. This application improves the transmission structure of the thread cutting device 2 and the presser foot lifting device 3.

[0026] Specifically, the presser foot lifting device 3 includes a presser foot lifting drive mechanism, a presser foot lifting transmission mechanism, and a presser foot assembly 35. The presser foot lifting drive mechanism includes a presser foot lifting drive cylinder 31, a drive connector 321, and a presser foot lifting drive shaft 32. The drive connector 321 is located at the output end of the presser foot lifting drive cylinder 31, and the presser foot lifting drive shaft 32 is inserted into the drive connector 321. The drive connector 321 is bent. Since the presser foot lifting drive shaft 32 is limited on the frame 1, when the presser foot lifting drive cylinder 31 works, it pushes out the drive connector 321, which allows the presser foot lifting drive shaft 32 to rotate. After the presser foot lifting drive shaft 32 rotates, it can further drive the presser foot linkage assembly 34 to move.

[0027] Furthermore, the lifting foot drive mechanism also includes a drive reset component 322 and a reset connector 323. The reset connector 323 is sleeved on the outside of the lifting foot drive shaft 32. One end of the drive reset component 322 is connected to the reset connector 323, and the other end is connected to the frame 1. The drive reset component 322 is configured as a tension spring. When the lifting foot drive shaft 32 rotates and drives the reset connector 323 to rotate, the tension spring is stretched. Due to its own elasticity, it can assist the lifting foot drive shaft 32 in rotating and resetting through the reset connector 323.

[0028] As shown in Figure 3-5, the presser foot lifting linkage assembly 34 includes a hinge rod 341, a presser foot crank 342, a presser foot bracket 343, and a ball screw 346. The middle part of the hinge rod 341 is hinged to the swing arm seat 12 inside the frame 1, so that both ends of the hinge rod 341 can swing under force. The rear end of the presser foot crank 342 is connected to the front end of the hinge rod 341, and the front end is sleeved on the presser foot lifting shaft 33. The rear end of the presser foot crank 342 is driven by the hinge rod 341 to realize the rotation of the presser foot lifting shaft 33. The front end of the presser foot bracket 343 is connected to the rear end of the hinge rod 341 through the presser foot connecting rod 344, and the rear end is sleeved on the presser foot lifting drive shaft 32, which can then transmit the rotational power. The front end of the ball screw 346 is cylindrical, and the cylindrical part is movably mounted on the presser foot bracket 343. The middle part is spherical, and the spherical part is movably abutting against the presser foot connecting rod 344. The rear end has a nut, which abuts against the outer wall of the presser foot connecting rod 344. The part between the nut and the cylindrical part is a movable position, and the presser foot connecting rod 344 is movably mounted in this movable position. The direction of force can be changed through the spherical part, which ultimately realizes the rotation of the presser foot lifting shaft 33. In order for the components to cooperate with each other during the transmission process, we have opened an oblong hole on the hinge rod 341. The hinge rod 341 is mounted on the swing rod seat 12 through the hinge pin. The oblong hole can be adapted to the operation of the presser foot lifting linkage assembly 34.

[0029] like Figure 3 and Figure 4As shown, a presser foot mounting plate 345 extends laterally from the front end of the presser foot pivot 33. "Extending laterally" means that the presser foot mounting plate 345 is not positioned on the axis of the presser foot pivot 33. The presser foot assembly 35 includes a right presser foot bracket 351, a right presser foot portion 353, a left presser foot bracket 354, and a left presser foot portion 356. The right presser foot bracket 351 is mounted on the presser foot mounting plate 345 and is also mounted on the presser foot pivot 33 via a right presser foot screw 352. The right presser foot portion 353 is mounted on the right presser foot... On bracket 351, left presser foot bracket 354 is mounted on presser foot mounting plate 345. Left presser foot bracket 354 is also mounted on frame 1 via left presser foot screw 355. Left presser foot part 356 is mounted on left presser foot bracket 354. Both right presser foot part 353 and left presser foot 356 need to be pushed by presser foot mounting plate 345 to rotate. Right presser foot part 353 rotates around the axis of right presser foot screw 352. Right presser foot screw 352 and presser foot lifting shaft 33 are coaxial. Left presser foot 356 rotates around the axis of left presser foot screw 355.

[0030] Furthermore, the right presser foot bracket 351 and the left presser foot bracket 354 are respectively provided with a right presser foot protrusion 357 and a left presser foot protrusion 358. The right presser foot protrusion 357 and the left presser foot protrusion 358 are mounted on the presser foot mounting plate 345. The presser foot assembly 35 also includes a right presser foot reset component 359 and a left presser foot reset component 360. One end of the right presser foot reset component 359 is connected to the right presser foot bracket 351 and the other end is connected to the frame 1. One end of the left presser foot reset component 360 is connected to the left presser foot bracket 354 and the other end is connected to the frame 1. Both the right presser foot reset component 359 and the left presser foot reset component 360 are used for auxiliary reset.

[0031] Furthermore, the blind stitch machine also includes a diamond-shaped plate device 4, which includes a diamond-shaped plate drive mechanism 41 and a diamond-shaped plate part 42. The diamond-shaped plate is driven to lift and lower the diamond-shaped plate part 42 through the swing arm seat 12. The diamond-shaped plate part 42 is located between the right presser foot part 353 and the left presser foot part 356. The diamond-shaped plate device 4 and the presser foot lifting device 3 are tightly fitted together and share the swing arm seat 12 in the frame 1, saving space in the frame 1.

[0032] like Figure 1 and Figure 2As shown, the wire cutting device 2 includes a wire clamping mechanism 21 and a wire cutting mechanism 22. The wire clamping mechanism 21 is disposed on the top surface of the frame 1, and the wire cutting mechanism 22 is disposed on the wire clamping mechanism 21. The wire clamping mechanism 21 includes a wire clamping bracket 211, a lead wire piece 214, a wire pressing cylinder 216, a wire pressing stationary piece 217, and a wire pressing movable piece 218. The wire clamping bracket 211 has two oppositely arranged mounting ears 212, forming a wire clamping mounting position 213 between the two mounting ears 212. The lead wire piece 214 is disposed in the wire clamping mounting position 213. On the left side, the lead wire 214 has a thread hole 215 at its front end. The thread pressing cylinder 216 is located on the right side of the thread clamping mounting position 213. The thread pressing fixed plate 217 is located close to the lead wire 214. The thread pressing movable plate 218 is located at the output end of the thread pressing cylinder 216 and is used to clamp the thread in conjunction with the thread pressing fixed plate 217. All components of the thread clamping mechanism 21 are located within the thread clamping mounting position 213. Its overall structure is compact and highly functional. The thread pressing cylinder 216 pushes the thread pressing movable plate 218 to cooperate with the thread pressing fixed plate 217 to control the sewing thread.

[0033] Furthermore, the wire cutting mechanism 22 includes a wire cutting cylinder 221 and a scissor blade 223. The wire cutting cylinder 221 is mounted on the wire clamping bracket 211, and the scissor blade 223 is mounted on the output end of the wire cutting cylinder 221. The wire clamping bracket 211 is bent downward to form a wire cutting mounting plate 224. The wire cutting cylinder 221 is mounted on the wire cutting mounting plate 224 via a wire cutting mounting block 222. A wire-passing hole 225 is provided on the wire clamping bracket 211, and the scissor blade 223 is movably positioned below the wire-passing hole 225.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this technical solution. Those skilled in the art should understand that this technical solution is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this technical solution. Various changes and modifications can be made to this technical solution without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed technical solution. The scope of protection of this technical solution is defined by the appended claims and their equivalents.

Claims

1. A blind seam sewing machine, characterized in that, include: A frame (1) having a needle plate (11) for supporting and guiding the fabric; The thread cutting device (2) includes a scissor blade (223) which is movably disposed above the needle plate (11). The thread cutting device (2) is used to receive external signals and control the scissor blade (223) to perform thread cutting. as well as The presser foot lifting device (3) includes a presser foot assembly (35), which is movably disposed below the needle plate (11). The presser foot assembly (35) can move close to the needle plate (11) and cooperate with the needle plate (11) to clamp the fabric. The foot-lifting device (3) includes: The pressure foot lifting drive mechanism includes a pressure foot lifting drive cylinder (31) and a pressure foot lifting drive shaft (32) disposed at the output end of the pressure foot lifting drive cylinder (31). The pressure foot lifting drive cylinder (31) is used to drive the pressure foot lifting drive shaft (32) to rotate. The presser foot lifting transmission mechanism includes a presser foot lifting shaft (33) and a presser foot lifting linkage assembly (34). The presser foot lifting linkage assembly (34) receives the rotational power from the presser foot driving shaft (32) and inputs this power to the presser foot lifting shaft (33) to make it rotate; and The presser foot assembly (35) is located at the rear end of the presser foot lifting shaft (33).

2. The concealed seam sewing machine according to claim 1, characterized in that: The lifting foot drive mechanism also includes a curved drive connector (321), the front end of which is connected to the output end of the lifting foot drive cylinder (31), and the rear end is sleeved outside the lifting foot drive shaft (32) to drive the lifting foot drive shaft (32) to rotate. The lifting foot drive mechanism also includes a drive reset component (322) and a reset connector (323). The reset connector (323) is sleeved outside the lifting foot drive shaft (32). One end of the drive reset component (322) is connected to the reset connector (323), and the other end is connected to the frame (1).

3. A concealed seam sewing machine according to claim 2, characterized in that: The lifting foot linkage assembly (34) includes: The hinge rod (341) is hinged in the middle to the swing arm seat (12) inside the frame (1); The presser foot crank (342) is connected at its rear end to the front end of the hinge rod (341), and the front end is sleeved outside the presser foot lifting shaft (33); The presser foot bracket (343) has its front end connected to the rear end of the hinge rod (341) via the presser foot connecting rod (344), and its rear end is sleeved outside the presser foot lifting drive shaft (32); and A ball screw (346) is movably mounted on the presser foot bracket (343) for driving the presser foot connecting rod (344); The ball screw (346) has a movable position, the presser foot connecting rod (344) is movably disposed in the movable position, the hinge rod (341) has an oblong hole, and the hinge rod (341) is disposed on the swing arm seat (12) by a hinge pin.

4. A concealed seam sewing machine according to claim 3, characterized in that: The front end of the lifting foot pivot (33) is provided with a foot mounting plate (345) extending to the side; The presser foot assembly (35) includes: A right presser foot bracket (351) is mounted on the presser foot mounting plate (345), and the right presser foot bracket (351) is also mounted on the presser foot lifting shaft (33) by a right presser foot screw (352); The right presser foot (353) is mounted on the right presser foot bracket (351); A left presser foot bracket (354) is mounted on the presser foot mounting plate (345), and the left presser foot bracket (354) is also mounted on the frame (1) by a left presser foot screw (355); and The left pressure foot (356) is mounted on the left pressure foot bracket (354).

5. A concealed seam sewing machine according to claim 4, characterized in that: The right presser foot bracket (351) and the left presser foot bracket (354) are respectively provided with a right presser foot protrusion (357) and a left presser foot protrusion (358), and the right presser foot protrusion (357) and the left presser foot protrusion (358) are mounted on the presser foot mounting plate (345); The presser foot assembly (35) further includes a right presser foot reset component (359) and a left presser foot reset component (360). One end of the right presser foot reset component (359) is connected to the right presser foot bracket (351), and the other end is connected to the frame (1). One end of the left presser foot reset component (360) is connected to the left presser foot bracket (354), and the other end is connected to the frame (1).

6. A concealed seam sewing machine according to claim 5, characterized in that: It also includes a diamond-raising disc device (4), which contains a diamond-raising disc drive mechanism (41) and a diamond-raising disc part (42). The diamond-raising disc drives the diamond-raising disc part (42) to rise and fall through a rocker arm seat (12). The diamond-raising disc part (42) is located between the right pressure foot part (353) and the left pressure foot part (356).

7. A blind seam sewing machine according to any one of claims 1-6, characterized in that, The wire-cutting device (2) includes: A wire clamping mechanism (21) is disposed on the top surface of the frame (1); and A wire-cutting mechanism (22) is disposed on the wire-clamping mechanism (21); The wire clamping mechanism (21) includes: The wire clamp bracket (211) has two oppositely arranged mounting ears (212), and a wire clamp mounting position (213) is formed between the two mounting ears (212); A lead sheet (214) is provided on the left side of the wire clamping mounting position (213), and the lead sheet (214) has a wire through hole (215) at its front end; A wire clamping cylinder (216) is located on the right side of the wire clamping mounting position (213); A wire clamping piece (217) is disposed close to the lead piece (214); and The wire clamping moving piece (218) is located at the output end of the wire clamping cylinder (216) and is used to clamp the wire in conjunction with the wire clamping stationary piece (217).

8. A concealed seam sewing machine according to claim 7, characterized in that, The wire-cutting mechanism (22) includes: A wire-cutting cylinder (221) is mounted on the wire clamping bracket (211); and The scissor blade (223) is located at the output end of the wire-cutting cylinder (221).

9. A concealed seam sewing machine according to claim 8, characterized in that: The wire clamping bracket (211) is bent downward to form a wire cutting mounting plate (224), and the wire cutting cylinder (221) is mounted on the wire cutting mounting plate (224) via a wire cutting mounting block (222). The wire clamp bracket (211) has a wire hole (225), and the scissor blade (223) is movably positioned below the wire hole (225).

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