Backstitch mechanism of sewing machine

Abstract

The utility model discloses an inverted bone seam mechanism of a sewing machine, which comprises an inverted bone mounting block mounted on the left side of a pressing mounting plate, an inverted bone driving cylinder is obliquely mounted on the front side of the inverted bone mounting block, and a driving rod of the inverted bone driving cylinder is connected with an inverted bone pressing sheet used for shifting a bone seam. According to the inverted bone sewing mechanism of the sewing machine, the driving rod of the inverted bone driving air cylinder is connected with the inverted bone pressing piece, a transmission structure is simplified, the inverted bone fixing block is provided with the inverted bone limiting piece, and when the driving rod drives the elastic connecting piece to move upwards, the inverted bone limiting piece is used for limiting the elastic connecting piece to rebound and deform.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology, specifically a boning mechanism for a sewing machine. Background Technology

[0002] A boning mechanism for a sewing machine, patent number 202320265957.3, includes a first mounting plate, a second mounting plate that moves up and down at an angle, and a boning piece that can be inserted into the presser foot input port on the second mounting plate.

[0003] In the patent disclosure, a cylinder is rotatably connected to a second mounting plate via a second shaft. A reverse bob is rotatably mounted on the second mounting plate. The cylinder drives the second connecting plate to move along a guide groove, thereby causing the reverse bob to move downwards in an arc shape, causing the front end of the reverse bob to bend the garment seam to one side. The connection between the cylinder and the reverse bob is relatively complex, increasing the cost of parts and requiring regular maintenance, thus increasing repair costs. Summary of the Invention

[0004] This utility model addresses the aforementioned technical problems by providing a boning sewing mechanism for a sewing machine, which simplifies the structure, reduces the number of parts, lowers production and operating costs, reduces the complexity of the mechanism, and improves overall efficiency.

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a bobbin sewing mechanism for a sewing machine, including a bobbin mounting block installed on the left side of the pressure plate, a bobbin driving cylinder installed obliquely on the front side of the bobbin mounting block, and a bobbin pressure plate for moving the bobbin sewing mechanism connected to the driving rod of the bobbin driving cylinder.

[0006] To optimize the above technical solution, the present invention also includes the following improved technical solutions.

[0007] The aforementioned reverse bone compression plate is connected to the drive rod via an elastic connecting plate; the reverse bone compression plate and the elastic connecting plate together form an arc-shaped surface.

[0008] The aforementioned drive rod is equipped with a reverse bone fixing block, the reverse bone fixing block is equipped with a reverse bone limiting plate, and the elastic connecting plate is fixed on the reverse bone fixing block; the bottom surface of the elastic connecting plate contacts and engages with the reverse bone limiting plate.

[0009] The aforementioned reverse bone mounting block has a reverse bone mounting plate on its front side. The reverse bone mounting plate has a first fixing hole and a first adjusting groove. The first adjusting groove is set at an angle. The reverse bone mounting plate is installed at an angle on the front side of the reverse bone mounting block. The cylinder body of the reverse bone drive cylinder is fixed in the first mounting hole of the reverse bone mounting plate.

[0010] The aforementioned pressing mounting plate is provided with a pressing mounting seat on its rear side. The pressing mounting plate is vertically installed at the front end of the pressing mounting seat, and the rear end of the pressing mounting seat is slidably installed on the frame.

[0011] Compared with the prior art, the present invention provides a bobbin sewing mechanism for a sewing machine. The drive rod of the bobbin drive cylinder is connected to the bobbin pressure plate through an elastic connecting plate, which simplifies the transmission structure. The bobbin fixing block is equipped with a bobbin limiting plate. When the drive rod drives the elastic connecting plate to move upward, the bobbin limiting plate is used to limit the elastic connecting plate's rebound deformation. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of this embodiment.

[0013] Figure 2 This is an exploded three-dimensional structural diagram of this embodiment. Detailed Implementation

[0014] The embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0015] Figures 1 to 2 The diagram shown is a structural schematic of this utility model.

[0016] The attached figures are labeled as follows: 1. Pressure roller; 2. Positioning screw; 3. Pressure mounting strip; 4. Pressure moving seat; 4. First mounting part 4a; 5. Pressure mounting plate; 6. First guide rail; 7. Pressure driving cylinder; 8. Pressure cylinder mounting bracket; 9. Pressure connecting plate; 10. Pressure cylinder connector; 11. Adjusting screw; 12. Nut; 13. Adjustable screw; 14. Limiting block; 15. Bone position sensor; 15a. Contact part; 16. Pressure mounting seat; 17. Reverse bone mounting block; 18. Reverse bone mounting plate; 18. First fixing hole; 18a. First adjusting groove; 18b. First mounting hole; 18c. Reverse bone driving cylinder; 19. Reverse bone fixing block; 20. Reverse bone pressing plate; 21. Elastic connecting plate; 21a. Reverse bone limiting plate; 22. Worktable surface; 23.

[0017] The present invention relates to a sewing machine, which includes a sewing machine head, a bone position sensing mechanism, and a reverse stitching mechanism disposed on a worktable 23.

[0018] The bone position sensing mechanism includes a pressure roller 1 disposed above the worktable surface 23 and a bone position sensor 15 disposed below the worktable surface 23. When the sewing fabric moves on the worktable surface, the contact portion 15a of the pressure roller 1 and the bone position sensor 15 cooperates to perform bone position sensing.

[0019] The pressure roller 1 is rotatably mounted on the bottom of the pressure mounting strip 3 by the positioning screw 2. The pressure mounting strip 3 is inclined, and the other end of the pressure mounting strip 3 is provided with a pressure moving seat 4. The front side of the pressure moving seat 4 is provided with a forward-extending first mounting part 4a, which is fixedly connected to the other end of the pressure mounting strip 3.

[0020] A pressing mounting plate 5 is provided on the rear side of the pressing moving seat 4, and the pressing moving seat 4 is slidably mounted on the front side of the pressing mounting plate 5. A pressing mounting seat 16 is provided on the rear side of the pressing mounting plate 5, the pressing mounting plate 5 is fixed to the front end of the pressing mounting seat 16, and the rear end of the pressing mounting seat 16 is slidably mounted on the frame.

[0021] A first guide rail 6 is mounted on the front side of the pressing mounting plate 5, and a first slider matching the first guide rail 6 is mounted on the rear side of the pressing moving seat 4. The pressing moving seat 4 moves up and down along the first guide rail 6. A pressing drive cylinder 7 is provided on the rear side of the pressing mounting plate 5, and the cylinder body of the pressing drive cylinder 7 is fixed to the upper end of the pressing mounting plate 5 through a pressing cylinder mounting bracket 8. A pressing connecting plate 9 is provided on the rear side of the pressing moving seat 4, and the drive rod of the pressing drive cylinder 7 is fixedly connected to the pressing connecting plate 9 through a pressing cylinder connector 10. The other end of the pressing connecting plate 9 is fixedly connected to the rear side of the pressing moving seat 4.

[0022] The drive rod of the pressing drive cylinder 7 drives the pressing connecting plate 9 to move up and down. The pressing connecting plate 9 drives the pressing moving seat 4 to move up and down along the first guide rail 6. The pressing wheel 1 connected to the pressing moving seat 4 moves up and down along the first guide rail 6.

[0023] An adjusting screw 11 for limiting the height of the pressing wheel 1 is provided above the pressing mounting base 16. A nut 12 is installed at the bottom of the adjusting screw 11. The adjusting screw 11 is locked in the limiting block 14 by an adjustable screw 13. The other end of the limiting block 14 is fixedly connected to the pressing moving base 4 through the pressing connecting plate 9. When the pressing drive cylinder 7 drives the pressing connecting plate 9 to move downward, the pressing connecting plate 9 drives the adjusting screw 11 on the limiting block 14 to move downward. When the nut 12 at the bottom of the adjusting screw 11 abuts against the upper surface of the pressing mounting base 16, the adjusting screw 11 on the limiting block 14 stops moving, and the pressing wheel 1 connected to the pressing connecting block stops moving.

[0024] A bone position sensor 15 is provided below the worktable 23. The position of the bone position sensor 15 corresponds vertically to the pressure roller 1. The bone position sensor 15 has an upwardly protruding contact part 15a that passes through the worktable 23.

[0025] The pressure cylinder 7 drives the pressure roller 1 downwards, bringing it close to the fabric. The contact part 15a of the seam sensor 15 pushes the fabric upwards, and the fabric passes through the gap between the pressure roller and the contact part. When the seam at the seam joint passes the seam sensor 15, the seam presses down on the seam sensor 15, and the seam sensor 15 sends a signal. After receiving the signal, the PLC identifies the seam and, after a delay, the seam-folding mechanism shifts the seam to one side and sews it in place. Then, the pressure cylinder 7 drives the pressure roller 1 upwards, returning it to its initial position.

[0026] The reverse bone joint mechanism includes a reverse bone mounting block 17 installed on the left side of the pressure plate 5. A reverse bone mounting plate 18 is provided on the front side of the reverse bone mounting block 17. The reverse bone mounting plate 18 has a first fixing hole 18a and a first adjusting groove 18b. The first adjusting groove 18b is angled. A first screw is inserted into the first fixing hole 18a, and a second screw is inserted into the first adjusting groove 18b. The reverse bone mounting plate 18 can be tilted and installed on the front side of the reverse bone mounting block 17 by the first and second screws. The tilt of the reverse bone mounting plate 18 can be adjusted by adjusting the position of the second screw in the first adjusting groove 18b.

[0027] A reverse bone mounting block 17 has a reverse bone driving cylinder 19 on its front side. A first mounting hole 18c is formed on the reverse bone mounting plate 18, and the cylinder body of the reverse bone driving cylinder 19 is installed in the first mounting hole 18c. The driving rod of the reverse bone driving cylinder 19 has a reverse bone fixing block 20, and the reverse bone fixing block 20 is connected to a reverse bone pressure plate 21 for manipulating the bone suture. The reverse bone pressure plate 21 is fixedly connected to the reverse bone fixing block 20 via an elastic connecting piece 21a. The reverse bone pressure plate 21 and the elastic connecting piece 21a are integrally formed into an arc shape. The width of the reverse bone pressure plate 21 is slightly wider than that of the elastic connecting piece 21a, which facilitates increasing the contact area between the reverse bone pressure plate 21 and the bone suture.

[0028] The reverse bone fixing block 20 is equipped with a reverse bone limiting plate 22. The bottom surface of the elastic connecting plate 21a cooperates with the reverse bone limiting plate 22. The elastic connecting plate 21a is located between the reverse bone fixing block 20 and the reverse bone limiting plate 22. When the elastic connecting plate 21a moves upward, the reverse bone limiting plate 22 can limit the elastic connecting plate 21a from rebounding and deforming.

[0029] When the seam at the fabric joint moves to the presser foot input of the sewing machine head, the drive rod of the reverse-bone drive cylinder 19 drives the elastic connecting piece 21a to move diagonally downwards. The reverse-bone pressure plate 21 at the front end of the elastic connecting piece 21a pushes the seam to one side. The seam is pressed under the needle of the sewing machine head along with the fabric for sewing and fixation. Finally, the drive rod of the reverse-bone drive cylinder 19 retracts, causing the reverse-bone pressure plate 21 to return to its original position.

[0030] The preferred embodiment of this utility model has been described, and various changes or modifications made by those skilled in the art will not depart from the scope of this utility model.

Claims

1. A boning mechanism for a sewing machine, comprising a boning mounting block (17) mounted on the left side of a pressure plate (5), characterized in that: The front side of the inverted bone mounting block (17) is inclinedly mounted with an inverted bone driving cylinder (19), and the driving rod of the inverted bone driving cylinder (19) is connected to an inverted bone pressing plate (21) for moving the bone seam; the inverted bone pressing plate (21) is connected to the driving rod through an elastic connecting piece (21a); ​​the inverted bone pressing plate (21) and the elastic connecting piece (21a) are integrally formed into an arc surface.

2. The boning mechanism of a sewing machine according to claim 1, characterized in that: The drive rod is equipped with a reverse bone fixing block (20), the reverse bone fixing block (20) is equipped with a reverse bone limiting piece (22), and the elastic connecting piece (21a) is fixed on the reverse bone fixing block (20); the bottom surface of the elastic connecting piece (21a) is in contact with the reverse bone limiting piece (22).

3. The boning mechanism of a sewing machine according to claim 2, characterized in that: The front side of the reverse bone mounting block (17) is provided with a reverse bone mounting plate (18), the reverse bone mounting plate (18) is provided with a first fixing hole (18a) and a first adjusting groove (18b), the first adjusting groove (18b) is set at an angle, and the reverse bone mounting plate (18) is installed at an angle on the front side of the reverse bone mounting block (17); the cylinder body of the reverse bone driving cylinder (19) is fixed in the first mounting hole (18c) of the reverse bone mounting plate (18).

4. The boning mechanism of a sewing machine according to claim 3, characterized in that: The pressure mounting plate (5) is provided with a pressure mounting seat (16) on the rear side. The pressure mounting plate (5) is vertically installed at the front end of the pressure mounting seat (16), and the rear end of the pressure mounting seat (16) is slidably installed on the frame.

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