Thread trimming mechanism of sewing machine

Abstract

The thread trimming mechanism comprises the sewing machine and a machine table located below the sewing machine, a strip-shaped through hole is formed in the position, corresponding to a presser foot of the sewing machine, on the machine table, and the end, away from the presser foot of the sewing machine, of the strip-shaped through hole extends out of the machine table; blades are fixed to the opposite hole wall faces in the strip-shaped through hole, cutting edges of the blades are oppositely arranged, a movable groove is formed in the side face, communicated with the strip-shaped through hole, of the machine table, the movable groove is communicated with the strip-shaped through hole, a baffle is arranged in the movable groove and shields the strip-shaped through hole, and the end, away from the sewing machine presser foot, of the baffle extends out of the machine table and is provided with a handle. A positioning through hole is formed in one side face in the movable groove, and a positioning insertion rod capable of being inserted into the positioning through hole is arranged on the baffle. A positioning spring is arranged on one side face of the baffle and away from the positioning insertion rod, and the other end of the positioning spring is fixed to the opposite groove wall face of the movable groove. The utility model has the advantages of simple structure, easy thread end cutting and no shielding of sewing sight.

Description

Technical Field

[0001] The utility model relates to the field of industrial sewing machines, in particular to a thread trimming mechanism of a sewing machine. Background Art

[0002] A sewing machine is a machine that can sew fabrics together. It is mainly composed of a machine head, a base, a needle plate, a motor, a bobbin rack, a pedal and other parts.

[0003] The existing thread trimming mechanism has a complex structure and is composed of multiple parts, which indirectly increases the production cost of the sewing machine. In addition, multiple components are arranged at the presser foot, which will also affect the line of sight of sewing fabrics. For example, Chinese Utility Model Patent No. 202320041021.2 discloses a thread trimming mechanism for a sewing machine, in which a rotary hook table is fixed at the bottom of a casing, a fixed knife seat is fixed on the rotary hook table, a fixed knife and a thread clamping plate are fixed on the fixed knife seat, and a movable knife seat is rotatably mounted on the rotary hook table. A movable knife is fixed on the movable knife seat, a lower shaft passes horizontally through the rotary hook table, the lower shaft is mounted on the bottom of the casing and can rotate in the rotary hook table, a thread trimming cam is fixed on the lower shaft, and an electromagnet is fixed to the bottom of the casing. A first thread trimming crank is rotatably sleeved on a crank pin, and the crank pin is planted in the bottom of the casing. The upper end surface of the second thread trimming crank is against the lower end surface of the rotary hook table. Therefore, a new technology is proposed. Utility Model Content

[0004] The utility model solves the above technical problems and provides a simpler and low-cost thread trimming mechanism for a sewing machine.

[0005] In order to solve the above technical problems, the utility model provides a technical solution as follows: a thread trimming mechanism of a sewing machine, comprising a sewing machine and a machine table located below the sewing machine, a strip through hole is opened on the machine table at a position corresponding to the position of the sewing machine presser foot, and one end of the strip through hole away from the sewing machine presser foot extends out of the machine table;

[0006] Blades are fixed on the opposite hole walls in the strip through hole, and the blade edges are arranged opposite to each other. A movable groove is provided on the side where the machine table is connected to the strip through hole, and the movable groove is connected to the strip through hole. A baffle is provided in the movable groove, and the baffle blocks the strip through hole. One end of the baffle away from the presser foot of the sewing machine extends out of the machine table and is provided with a handle. The handle is semicircular, easy to pull, and has no sharp points, so it will not hurt the hand.

[0007] A positioning through hole is opened on one side of the movable groove, and a positioning plug rod which can be inserted into the positioning through hole is provided on the baffle; a positioning spring is provided on one side of the baffle and away from the positioning plug rod, and the other end of the positioning spring is fixed on the groove wall surface opposite to the movable groove.

[0008] Furthermore, the distance between the baffle and the positioning through hole is greater than the width of the baffle.

[0009] Furthermore, thread cutting gaps are provided between the blades.

[0010] Furthermore, a positioning spring is connected to one end of the baffle plate 7 close to the presser foot of the sewing machine.

[0011] Further, the strip-shaped through hole is located at two-thirds of the active groove, and the baffle is also located at two-thirds of the active groove.

[0012] The advantages of the utility model compared with the prior art are:

[0013] The utility model product is arranged on the machine table. When in use, the baffle is moved to expose the blade, and then one end of the sewing cloth or base material is moved to the blade, and then the thread end is wound into the blade to remove the thread end. The whole structure is simple and easy to operate. Moreover, the product is not arranged at the presser foot of the sewing machine, and will not block the sewing sight.

[0014] The purpose of setting the positioning spring is that when the hand releases the baffle, the baffle can automatically return to its original position due to the elastic force of the positioning spring to block the blade, thereby preventing the cloth from being moved into the blade and being scratched, and ensuring safe use. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 The utility model is a three-dimensional structural schematic diagram of a thread trimming mechanism of a sewing machine.

[0016] Figure 2 The utility model is a schematic diagram of the main structure of a thread trimming mechanism of a sewing machine.

[0017] Figure 3 The utility model is a schematic diagram of the internal structure of a movable groove of a thread trimming mechanism of a sewing machine.

[0018] Figure 4 The utility model is a structural schematic diagram of a baffle plate of a thread trimming mechanism of a sewing machine in an open state.

[0019] As shown in the figure: 1. sewing machine, 2. machine table, 3. strip through hole, 5. blade, 6. movable groove, 7. baffle, 8. handle, 9. positioning through hole, 10. positioning rod, 11. positioning spring. DETAILED DESCRIPTION

[0020] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0022] In combination with all the drawings, a thread trimming mechanism of a sewing machine comprises a sewing machine 1 and a machine table 2 located below the sewing machine 1, a strip-shaped through hole 3 is opened on the machine table 2 and at a position corresponding to the position of the presser foot of the sewing machine 1, and an end of the strip-shaped through hole 3 away from the presser foot of the sewing machine 1 extends out of the machine table 2;

[0023] Blades 5 are fixed to the opposite hole walls in the strip through hole 3. The blades of the blades 5 are arranged opposite to each other. A thread cutting gap is provided between the blades 5. A movable groove 6 is provided on the side where the machine table 2 is connected to the strip through hole 3. The movable groove 6 is connected to the strip through hole 3. A baffle 7 is provided in the movable groove 6. The baffle 7 blocks the strip through hole 3. The strip through hole 3 is located at two-thirds of the movable groove 6. The baffle 7 is also located at two-thirds of the movable groove 6. The end of the baffle 7 away from the presser foot of the sewing machine 1 extends out of the machine table 2 and is provided with a handle 8. The handle 8 is semicircular, easy to pull, and has no sharp parts, so it will not hurt your hand.

[0024] A positioning through hole 9 is opened on one side of the movable groove 6, and the distance between the baffle 7 and the positioning through hole 9 is greater than the width of the baffle 7. A positioning rod 10 that can be inserted into the positioning through hole 9 is provided on the baffle 7. In the initial position, only the head end of the positioning rod 11 is located in the positioning through hole 9. After the baffle 7 is moved close to the positioning rod 10, the positioning rod 10 can be hidden in the positioning through hole 9; a positioning spring 11 is provided on one side of the baffle 7 and away from the positioning rod 10, and the other end of the positioning spring 11 is fixed on the groove wall surface opposite to the movable groove 6, and the positioning spring 11 is connected to one end of the baffle 7 close to the presser foot of the sewing machine 1.

[0025] When the utility model is implemented, when in use, the baffle is moved to expose the blade, and then one end of the sewing cloth or base material is moved to the blade, and then the thread end is wound into the blade to remove the thread end. The baffle can automatically return to its position due to the elastic force of the positioning spring to shield the blade, so as to prevent the cloth from being moved into the blade and being scratched, and the use is safe; the positioning rod can be inserted into the positioning slot, so that the baffle can move in a straight line without causing random movement. In summary, the product of the utility model has a simple structure and is easy to operate. It is not set at the presser foot of the sewing machine and will not block the sewing line of sight.

[0026] The above description of the utility model and its implementation methods is not restrictive. The drawings show only one implementation method of the utility model, and the actual structure is not limited thereto. In short, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention of the utility model, they should all fall within the protection scope of the utility model.

Claims

1. A thread trimming mechanism for a sewing machine, comprising a sewing machine (1) and a machine table (2) located below the sewing machine (1), characterized in that: A strip-shaped through hole (3) is provided on the machine table (2) at a position corresponding to the position of the presser foot of the sewing machine (1); one end of the strip-shaped through hole (3) away from the presser foot of the sewing machine (1) extends out of the machine table (2); opposite hole walls in the strip-shaped through hole (3) are provided with blades (5); a movable groove (6) is provided on the side of the machine table (2) communicating with the strip-shaped through hole (3); the movable groove (6) is communicated with the strip-shaped through hole (3); a baffle (7) is provided in the movable groove (6); the baffle (7) The strip-shaped through hole (3) is blocked; one end of the baffle (7) away from the presser foot of the sewing machine (1) extends out of the machine table (2) and is provided with a handle (8); a positioning through hole (9) is opened on one side of the movable groove (6); a positioning rod (10) capable of being inserted into the positioning through hole (9) is provided on the baffle (7); a positioning spring (11) is provided on one side of the baffle (7) away from the positioning rod (10); the other end of the positioning spring (11) is fixed to the groove wall surface opposite to the movable groove (6).

2. A thread trimming mechanism for a sewing machine according to claim 1, characterized in that: The distance between the baffle plate (7) and the positioning through hole (9) is greater than the width of the baffle plate (7).

3. The thread trimming mechanism of a sewing machine according to claim 1, characterized in that: Thread cutting gaps are provided between the blades (5).

4. The thread trimming mechanism of a sewing machine according to claim 1, characterized in that: The positioning spring (11) is connected to one end of the baffle (7) close to the presser foot of the sewing machine (1).

5. The thread trimming mechanism of a sewing machine according to claim 1, characterized in that: The strip-shaped through hole (3) is located at two-thirds of the active groove (6), and the baffle (7) is also located at two-thirds of the active groove (6).

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