Short thread end cutting device of column type sewing machine

Abstract

The utility model relates to the technical field of sewing machines, and discloses a column type sewing machine short thread end cutting device which comprises a vehicle plate and a sewing machine head arranged on the vehicle plate, a threading groove is formed in the vehicle plate in a penetrating mode, a thread cutting mechanism is arranged in the threading groove, the thread cutting mechanism comprises a left cutter and a right cutter, and the left cutter and the right cutter are arranged in an up-down contact mode. The left cutter and the right cutter are hinged together, the hinged axis is vertically arranged, the left cutter and the right cutter form a scissor structure, and shearing action is completed through rotation, so that the thread cutting mechanism is installed on the vehicle plate, the sewing machine has a thread cutting function, additional scissors are not needed for thread cutting, operation is easy, safety is high, and the sewing machine is convenient to use. Meanwhile, thread trimming is conducted from the lower portion of sewing, the thread trimming length is shortened, and secondary thread trimming is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a short-thread cutting device for a columnar sewing machine. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so as to interweave or stitch together one or more layers of sewing materials. A columnar sewing machine, also called a vertical sewing machine, can be used for placing articles during sewing and can be used for hemming the shoe mouth and shoe tongue, etc. During the sewing process of the sewing machine, scissors are needed to cut the thread. However, the operating space at the position of the sewing machine head is small, which is not convenient for operation, and it is easy to collide with the needle and cause stabbing. Moreover, the remaining thread after cutting the product is too long and needs to be cut again, which is troublesome to operate. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a short-thread cutting device for a columnar sewing machine, which has a self-cutting function, is simple to operate, and has a short remaining thread without secondary cutting.

[0004] The purpose of the utility model is realized by the following technical solutions: A short-thread cutting device for a columnar sewing machine includes a vehicle plate and a sewing machine head arranged on the vehicle plate. A threading groove is formed through the vehicle plate, and a cutting mechanism is arranged in the threading groove. The cutting mechanism includes a left cutter and a right cutter, and the left cutter and the right cutter are in contact with each other up and down. The left cutter and the right cutter are hinged together, and the hinge axis is arranged vertically.

[0005] Further, receiving grooves are formed on both side walls of the threading groove. In the normal state, the left cutter and the right cutter are respectively located in the two receiving grooves.

[0006] Further, an installation groove is formed at one end of the threading groove on the vehicle plate. The threading groove and the receiving groove are both communicated with the installation groove. One end of the left cutter extends into the installation groove and is fixed with a first hinge shaft, and the first hinge shaft is rotatably connected to the inner bottom wall of the installation groove. One end of the right cutter extends into the installation groove and is fixed with a second hinge shaft, and the second hinge shaft is rotatably connected to the inner top wall of the installation groove. The first hinge shaft and the second hinge shaft are coaxially arranged.

[0007] Further, a lower gear and an upper gear are respectively sleeved on the first hinge shaft and the second hinge shaft. A left rack is meshed with the side of the lower gear away from the upper gear, and a right rack is meshed with the side of the upper gear away from the lower gear. The left rack and the right rack are both slidably connected to the vehicle plate.

[0008] Further, a traction line is slidably inserted into the vehicle board, and the moving direction of the traction line is parallel to the moving direction of the left rack. Both the left rack and the right rack are connected to the traction line through a pull wire. A pedal is inclinedly arranged below the vehicle board, and the pedal is hinged to the vehicle board. The end of the traction line away from the pull wire is connected to the high end of the pedal.

[0009] Further, two sliding grooves are formed in the inner bottom wall of the installation groove. The left rack and the right rack are respectively slidably arranged in the two sliding grooves. Both the left rack and the right rack are connected with springs, and the springs are located in the sliding grooves and connected to the vehicle board.

[0010] Further, a plurality of guiding fixed pulleys are arranged on the vehicle board, and the traction line bypasses the guiding fixed pulleys and is connected to the pedal.

[0011] Further, a return spring is arranged between the pedal and the vehicle board.

[0012] The beneficial effects of the present utility model are as follows:

[0013] 1. The tangent mechanism is arranged inside the vehicle board, and the thread is cut from below the sewing, shortening the thread cutting length and avoiding secondary thread cutting.

[0014] 2. The left cutter and the right cutter form a scissor structure, and the cutting action is completed by rotation, so that the tangent mechanism is installed on the vehicle board, enabling the sewing machine to have a thread cutting function. There is no need to use an additional scissor for thread cutting, the operation is simple, and the safety is relatively high. Description of the Drawings

[0015] Figure 1 is a schematic structural view of a short-thread tangent device of a column type sewing machine according to the present utility model Figure 1 ;

[0016] Figure 2 is a schematic structural view of a short-thread tangent device of a column type sewing machine according to the present utility model Figure 2 ;

[0017] Figure 3 is an internal top view of the vehicle board in a short-thread tangent device of a column type sewing machine according to the present utility model;

[0018] Figure 4 is Figure 3 the enlarged view at A in

[0019] Figure 5 is a partial side view of the vehicle board in a short-thread tangent device of a column type sewing machine according to the present utility model;

[0020] In the figure, 1 is the vehicle board, 2 is the sewing machine head, 3 is the thread passing groove, 4 is the left cutting knife, 5 is the right cutting knife, 6 is the receiving groove, 7 is the installation groove, 8 is the first hinge shaft, 9 is the second hinge shaft, 10 is the lower gear, 11 is the upper gear, 12 is the left rack, 13 is the right rack, 14 is the traction line, 15 is the pull line, 16 is the pedal, 17 is the sliding groove, 18 is the spring, 19 is the guiding fixed pulley, 20 is the reset spring. Specific embodiments

[0021] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0022] As Figures 1 to 5 shown, a short-thread cutting device for a column-type sewing machine includes a vehicle board 1 and a sewing machine head 2 arranged on the vehicle board 1. A thread passing groove 3 is penetrated and opened on the vehicle board 1. A cutting mechanism is arranged in the thread passing groove 3. The cutting mechanism includes a left cutting knife 4 and a right cutting knife 5. The left cutting knife 4 and the right cutting knife 5 are in contact with each other up and down. The left cutting knife 4 and the right cutting knife 5 are hinged together, and the hinge axis is vertically arranged. The left cutting knife 4 and the right cutting knife 5 form a scissor structure, and the cutting action is completed by rotation, so that the cutting mechanism is installed on the vehicle board 1, enabling the sewing machine to have a thread cutting function, without the need to use an additional scissors for thread cutting, with simple operation and high safety. At the same time, the thread is cut from below the sewing, shortening the thread cutting length and avoiding secondary thread cutting.

[0023] Further, as Figure 1 and Figure 3 shown, receiving grooves 6 are opened on both side walls of the thread passing groove 3. Under normal conditions, the left cutting knife 4 and the right cutting knife 5 are respectively located in the two receiving grooves 6, hiding the left cutting knife 4 and the right cutting knife 5 in the receiving grooves 6, so that during the sewing process, the sewing thread will not contact the left cutting knife 4 and the right cutting knife 5, avoiding the accidental cutting of the sewing thread by the left cutting knife 4 or the right cutting knife 5.

[0024] Further, as Figures 1 to 5As shown in the figure, an installation groove 7 is provided at one end of the wire threading groove 3 of the vehicle board 1. The wire threading groove 3 and the accommodating groove 6 are both communicated with the installation groove 7. One end of the left cutting knife 4 extends into the installation groove 7 and is fixed with a first hinge shaft 8. The first hinge shaft 8 is rotatably connected to the inner bottom wall of the installation groove 7. One end of the right cutting knife 5 extends into the installation groove 7 and is fixed with a second hinge shaft 9. The second hinge shaft 9 is rotatably connected to the inner top wall of the installation groove 7. The first hinge shaft 8 and the second hinge shaft 9 are coaxially arranged. A lower gear 10 and an upper gear 11 are respectively sleeved on the first hinge shaft 8 and the second hinge shaft 9. A left rack 12 is engaged with the side of the lower gear 10 away from the upper gear 11. A right rack 13 is engaged with the side of the upper gear 11 away from the lower gear 10. The left rack 12 and the right rack 13 are both slidably connected to the vehicle board 1. A traction wire 14 is slidably penetrated in the vehicle board 1. The moving direction of the traction wire 14 is parallel to the moving direction of the left rack 12. The left rack 12 and the right rack 13 are both connected to the traction wire 14 through a pull wire 15. A pedal 16 is inclinedly arranged below the vehicle board 1. The pedal 16 is hinged on the vehicle board 1. One end of the traction wire 14 away from the pull wire 15 is connected to the high end of the pedal 16. When cutting the wire, step on the pedal 16 to deflect the pedal 16 downward, thereby pulling the traction wire 14 to move. The traction wire 14 simultaneously pulls the left rack 12 and the right rack 13 to move through the pull wire 15. The left rack 12 drives the lower gear 10 to rotate, and the right rack 13 drives the upper gear 11 to rotate. The lower gear 10 drives the left cutting knife 4 to rotate through the first hinge shaft 8, and the upper gear 11 drives the right cutting knife 5 to rotate through the second hinge shaft 9. Since the left rack 12 and the right rack 13 are oppositely arranged, the rotation direction of the upper gear 11 is opposite to the rotation direction of the lower gear 10, so that the left cutting knife 4 and the right cutting knife 5 rotate close to each other to perform the wire cutting action, and thus the wire cutting operation can be quickly completed.

[0025] Further, as Figures 1 to 4 shown, two sliding grooves 17 are provided on the inner bottom wall of the installation groove 7. The left rack 12 and the right rack 13 are respectively slidably arranged in the two sliding grooves 17. The left rack 12 and the right rack 13 are both connected with a spring 18. The spring 18 is located in the sliding groove 17 and is connected to the vehicle board 1. A return spring 20 is arranged between the pedal 16 and the vehicle board 1. When the spring 18 and the return spring 20 are in the normal state, the left cutting knife 4 and the right cutting knife 5 are both hidden in the accommodating groove 6, and the pedal 16 is in an inclined state. When stepping on the pedal 16, the range spring 20 will be compressed. When the left rack 12 and the right rack 13 move, the spring 18 will be compressed. After releasing the pedal 16 when the wire cutting operation is completed, under the reaction force of the return spring 20 and the spring 18, the left cutting knife 4 and the right cutting knife 5 are reset.

[0026] Further, as Figure 1 and Figure 2As shown, a plurality of guiding fixed pulleys 19 are arranged on the car body panel 1. The towing line 14 bypasses the guiding fixed pulleys 19 and is connected to the pedal 16. The movement direction of the towing line 14 is guided by the guiding fixed pulleys 19. The fixed pulley can also change the direction of the force, so that after the pedal 16 is depressed, the towing line 14 can smoothly drive the left rack 12 and the right rack 13 to move, making the operation of the structure more stable.

Claims

1. A short thread cutting device for a column type sewing machine, comprising a car plate (1) and a sewing machine head (2) arranged on the car plate (1), characterized in that: The vehicle plate (1) is provided with a threading groove (3), a thread cutting mechanism is arranged in the threading groove (3), and the thread cutting mechanism comprises a left cutter (4) and a right cutter (5), the left cutter (4) and the right cutter (5) are arranged in contact with each other up and down, the left cutter (4) and the right cutter (5) are hinged together, and the hinge axis is arranged vertically.

2. A short thread cutting device for a column type sewing machine according to claim 1, characterized in that: Both side walls of the threading groove (3) are provided with receiving grooves (6). Under normal conditions, the left cutter (4) and the right cutter (5) are respectively located in the two receiving grooves (6).

3. A short thread cutting device for a column type sewing machine according to claim 2, characterized in that: The vehicle plate (1) is provided with a mounting groove (7) at one end of the threading groove (3); the threading groove (3) and the receiving groove (6) are both connected to the mounting groove (7); one end of the left cutter (4) extends into the mounting groove (7) and is fixed with a first hinge shaft (8); the first hinge shaft (8) is rotatably connected to the inner bottom wall of the mounting groove (7); one end of the right cutter (5) extends into the mounting groove (7) and is fixed with a second hinge shaft (9); the second hinge shaft (9) is rotatably connected to the inner top wall of the mounting groove (7); the first hinge shaft (8) and the second hinge shaft (9) are coaxially arranged.

4. A short thread cutting device for a column type sewing machine according to claim 3, characterized in that: The first hinge shaft (8) and the second hinge shaft (9) are respectively provided with a lower gear (10) and an upper gear (11); a left rack (12) is meshed with the side of the lower gear (10) away from the upper gear (11); a right rack (13) is meshed with the side of the upper gear (11) away from the lower gear (10); and both the left rack (12) and the right rack (13) are slidably connected to the vehicle plate (1).

5. A short thread cutting device for a column type sewing machine according to claim 4, characterized in that: A traction line (14) is slidably provided in the vehicle plate (1), the moving direction of the traction line (14) is parallel to the moving direction of the left rack (12), the left rack (12) and the right rack (13) are connected to the traction line (14) via a pull line (15), a pedal (16) is obliquely provided below the vehicle plate (1), the pedal (16) is hinged on the vehicle plate (1), and the end of the traction line (14) away from the pull line (15) is connected to the high end of the pedal (16).

6. A short thread cutting device for a post-type sewing machine according to claim 4, characterized in that: The inner bottom wall of the mounting groove (7) is provided with two slide grooves (17), and the left rack (12) and the right rack (13) are respectively slidably arranged in the two slide grooves (17), and the left rack (12) and the right rack (13) are both connected with a spring (18), and the spring (18) is located in the slide groove (17) and connected to the vehicle plate (1).

7. A short thread cutting device for a column type sewing machine according to claim 5, characterized in that: A plurality of guide fixed pulleys (19) are arranged on the vehicle plate (1), and the traction line (14) passes around the guide fixed pulleys (19) and is connected to the pedal (16).

8. A short thread cutting device for a column type sewing machine according to claim 7, characterized in that: A return spring (20) is arranged between the pedal (16) and the vehicle plate (1).

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