Automatic thread trimming device for sewing

Abstract

The present invention discloses an automatic thread trimming device for sewing, including a dust plate pressure plate, a needle plate, a fixed blade, a fixed blade mounting seat, a small mouth barrel type mounting seat, a lower shaft, a lower shaft retaining ring, a rotary hook, a rotary hook cover, a rotating cutter bar, a rotating cutter, a movable cutter crank, a connecting rod screw, a connecting rod, a cylinder mounting plate, a cylinder, a cylinder fixing plate and a cylinder baffle. The present invention has a reasonable design, and the cylinder moves forward and backward to allow the force to drive the rotating cutter bar to rotate through the movable cutter crank, so that the rotating cutter and the fixed blade on the rotating cutter bar are crossed to form the effect of the scissors structure function, and the sewing thread is cut. The cylinder is extended and contracted as a power source to drive the rotating cutter and the lever principle is used for transmission, so that the relative opening and closing separation stability between the blade surface of the rotating cutter and the blade surface of the fixed blade can be ensured, and the shearing force is large.

Description

Technical Field

[0001] The invention relates to a thread trimming device, in particular to an automatic sewing thread trimming device, belonging to the technical field of sewing machine applications. 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 that one or more layers of sewing materials are interwoven or sewn together. The sewing machine can sew fabrics such as cotton, linen, silk, wool, and synthetic fibers, and products such as leather, plastic, and paper. The stitches are neat, beautiful, flat, and firm, and the sewing speed is fast and easy to use.

[0003] When sewing products with sewing machines meet special sewing requirements, such as cup covers, children's shoes, etc., when the bottom sewing requirements are met, the existing sewing machines are difficult to meet the automatic thread cutting requirements due to structural defects. At the same time, the thread material required for special sewing is also relatively special, and the cutting force required is relatively large, and it is relatively laborious to cut with general tools. Therefore, a sewing automatic thread cutting device is proposed to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to provide a sewing automatic thread trimming device in order to solve the above-mentioned problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical scheme: a sewing automatic thread trimming device, comprising a dustproof plate pressing plate, a thread trimming mechanism and a driving mechanism, wherein one end of a needle plate is installed in the middle of one side of the dustproof plate pressing plate, and the top end face of a cylinder baffle is installed at one end of the bottom of the dustproof plate pressing plate;

[0006] The thread trimming mechanism comprises a fixed blade and a rotating blade, wherein the fixed blade is mounted on a corresponding position of a fixed blade mounting seat, and the fixed blade mounting seat is mounted on the front end of a small mouth barrel-shaped mounting seat, and the rotating blade is mounted on the front end of a rotating blade rod, and the rotating blade rod is inserted into the middle position of the small mouth barrel-shaped mounting seat;

[0007] The driving mechanism includes a cylinder, one end of the push rod of the cylinder is movably connected to one end of the connecting rod through a connecting rod screw, and the other end of the connecting rod is movably connected to the corresponding part of the moving knife crank through a pin rod, the rear end of the rotating knife rod is rotatably equipped in the connecting hole structure of the moving knife crank, the rotating knife rod is a tubular structure, and a lower shaft is rotatably installed in the rotating knife rod.

[0008] Preferably, the fixed blade and the rotating blade are in a scissors shape, and the blade surface of the fixed blade and the blade surface of the rotating blade are staggered and slidably pressed against each other.

[0009] Preferably, a rotary hook is installed at the front end of the lower shaft, and a lower shaft retaining ring is sleeved on the inner side of the front end of the lower shaft.

[0010] Preferably, a rotary hook cover is installed at the bottom of the fixed blade mounting seat, and the rotary hook cover covers the rotary hook.

[0011] Preferably, the small nozzle barrel-shaped mounting seat is installed at the front end of the corresponding structure of the sewing machine, and one end of the output shaft of the sewing machine is connected to the rear end of the lower shaft.

[0012] Preferably, a cylinder mounting plate and a cylinder fixing plate are respectively installed at the front end and the rear end of the cylinder, and the top of the cylinder mounting plate is installed on the corresponding structure at the bottom of the cylinder baffle.

[0013] Preferably, the dustproof plate pressure plate, needle plate and cylinder baffle are installed on the upper end of the entire mechanism.

[0014] The beneficial effects of the present invention are:

[0015] 1. This type of automatic thread trimming device for sewing is reasonably designed. The cylinder moves forward and backward to allow the force to drive the rotating knife rod to rotate through the movable knife crank, so that the rotating knife and the fixed blade on the rotating knife rod intersect, forming the effect of the scissors structure function, and cutting the sewing thread.

[0016] 2. This type of automatic sewing thread trimming device is reasonably designed. It uses the extension and contraction of the cylinder as the power source to drive the rotating knife and adopts the lever principle for transmission. It can ensure the relative opening and closing stability between the blade surface of the rotating knife and the blade surface of the fixed blade, and has a large shearing force. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0018] Figure 1 It is an exploded view of the overall structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the cylinder and connecting rod structure of the present invention;

[0020] Figure 3 It is a schematic diagram of the connection structure between the rotary cutter rod and the lower shaft of the present invention.

[0021] In the figure: 1. dustproof plate pressure plate, 2. needle plate, 3. fixed blade, 4. fixed blade mounting seat, 5. small mouth barrel type mounting seat, 6. lower shaft, 7. lower shaft retaining ring, 8. rotary hook, 9. rotary hook cover, 10. rotating knife rod, 11. rotating knife, 12. moving knife crank, 13. connecting rod screw, 14. connecting rod, 15. cylinder mounting plate, 16. cylinder, 17. cylinder fixing plate, 18. cylinder baffle. DETAILED DESCRIPTION

[0022] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described below are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0024] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by the terms "upper", "lower", "top", "bottom", "inside", "outside", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0025] See also Figure 1-3 As shown, a sewing automatic thread trimming device comprises a dustproof plate pressing plate 1, a thread trimming mechanism and a driving mechanism, wherein one end of a needle plate 2 is installed in the middle of one side of the dustproof plate pressing plate 1, and the top end surface of a cylinder baffle 18 is installed at one end of the bottom of the dustproof plate pressing plate 1;

[0026] The thread trimming mechanism includes a fixed blade 3 and a rotating blade 11, wherein the fixed blade 3 is mounted on a corresponding position of a fixed blade mounting seat 4, and the fixed blade mounting seat 4 is mounted on the front end of a small mouth barrel-shaped mounting seat 5, and the rotating blade 11 is mounted on the front end of a rotating blade rod 10, and the rotating blade rod 10 is inserted into the middle position of the small mouth barrel-shaped mounting seat 5;

[0027] The driving mechanism includes a cylinder 16, one end of the push rod of the cylinder 16 is movably connected to one end of the connecting rod 14 through a connecting rod screw 13, and the other end of the connecting rod 14 is movably connected to the corresponding part of the movable knife crank 12 through a pin rod. The rear end of the rotating knife rod 10 is equipped in the connecting hole structure of the movable knife crank 12. The rotating knife rod 10 is a tubular structure, and the lower shaft 6 is rotatably installed in the rotating knife rod 10.

[0028] The fixed blade 3 and the rotating knife 11 are in the shape of scissors, and the blade surface of the fixed blade 3 and the blade surface of the rotating knife 11 are staggered and slid together, and the installation position relationship between the fixed blade 3 and the rotating knife 11 is clear; the front end of the lower shaft 6 is installed with a rotary hook 8, and the inner side of the front end of the lower shaft 6 is sleeved with a lower shaft retaining ring 7 to achieve the effect of installing and protecting the rotary hook 8; the bottom of the fixed blade mounting seat 4 is installed with a rotary hook cover 9, and the rotary hook cover 9 covers the rotary hook 8 to protect the worker's fingers and prevent accidental touching of the rotary hook 8 during work; the small mouth barrel type mounting seat 5 It is installed at the front end of the corresponding structure of the sewing machine, and one end of the output shaft of the sewing machine is connected to the rear end of the lower shaft 6, which is conducive to the operation of the sewing machine to drive the lower shaft 6 to rotate during sewing, and the lower shaft 6 drives the rotary hook 8 to rotate, and the rotary hook 8 can be used for sewing; the front and rear ends of the cylinder 16 are respectively installed with a cylinder mounting plate 15 and a cylinder fixing plate 17, and the top of the cylinder mounting plate 15 is installed on the corresponding structure at the bottom of the cylinder baffle 18, so as to achieve the effect of connecting and fixing the cylinder 16; the dust plate pressure plate 1, the needle plate 2 and the cylinder baffle 18 are installed on the upper end of the entire mechanism for protection and protection.

[0029] When the present invention is in use, the cylinder 16 moves forward and backward to allow the force to drive the rotating knife rod 10 to rotate through the movable knife crank 12, so that the rotating knife 11 on the rotating knife rod 10 and the fixed blade 3 intersect to form the effect of the scissors structure function, and the sewing thread is cut;

[0030] By extending and contracting the cylinder 16 as a power source to drive the rotating knife 11 and using the lever principle for transmission, the relative opening and closing stability between the blade surface of the rotating knife 11 and the blade surface of the fixed blade 3 can be ensured, and the shearing force is large.

[0031] The circuits, electronic components and modules involved are all prior art and can be fully implemented by those skilled in the art. Needless to say, the content protected by the present invention does not involve improvements to software and methods.

[0032] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations within the meaning and scope of the elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0033] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A sewing automatic thread trimming device, characterized in that: It comprises a dustproof plate pressing plate (1), a thread cutting mechanism and a driving mechanism, wherein one end of a needle plate (2) is installed in the middle of one side of the dustproof plate pressing plate (1), and the top end surface of a cylinder baffle (18) is installed at one end of the bottom of the dustproof plate pressing plate (1); The thread trimming mechanism comprises a fixed blade (3) and a rotating blade (11), wherein the fixed blade (3) is mounted at a corresponding position of a fixed blade mounting seat (4), and the fixed blade mounting seat (4) is mounted at the front end of a small mouth barrel type mounting seat (5), and the rotating blade (11) is mounted at the front end of a rotating blade rod (10), and the rotating blade rod (10) is inserted into the middle position of the small mouth barrel type mounting seat (5); The driving mechanism comprises a cylinder (16), one end of a push rod of the cylinder (16) is movably connected to one end of a connecting rod (14) through a connecting rod screw (13), and the other end of the connecting rod (14) is movably connected to a corresponding part of a movable knife crank (12) through a pin rod, the rear end of a rotating knife rod (10) is rotatably arranged in a connecting hole structure of the movable knife crank (12), the rotating knife rod (10) is a tubular structure, and a lower shaft (6) is rotatably installed in the rotating knife rod (10), a rotating shuttle (8) is installed at the front end of the lower shaft (6), and a lower shaft retaining ring (7) is sleeved on the inner side of the front end of the lower shaft (6), and the dust plate pressure plate (1), the needle plate (2) and the cylinder baffle (18) are installed at the upper end of the entire mechanism.

2. The automatic thread trimming device for sewing according to claim 1, characterized in that: The fixed blade (3) and the rotating blade (11) are in the shape of scissors, and the blade surface of the fixed blade (3) and the blade surface of the rotating blade (11) are staggered, slidably and abutted against each other.

3. The automatic thread trimming device for sewing according to claim 1, characterized in that: A rotary hook cover (9) is installed at the bottom of the fixed blade mounting seat (4), and the rotary hook cover (9) covers the periphery of the rotary hook (8).

4. The automatic thread trimming device for sewing according to claim 1, characterized in that: The small nozzle barrel type mounting seat (5) is mounted on the front end of the corresponding structure of the sewing machine, and one end of the output shaft of the sewing machine is connected to the rear end of the lower shaft (6).

5. The automatic thread trimming device for sewing according to claim 1, characterized in that: A cylinder mounting plate (15) and a cylinder fixing plate (17) are respectively installed at the front end and the rear end of the cylinder (16), and the top of the cylinder mounting plate (15) is installed on the corresponding structure at the bottom of the cylinder baffle (18).

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