A short thread head cutting mechanism for a sewing machine

Abstract

The utility model belongs to the technical field of sewing machines, specifically a short thread cutting mechanism for sewing machines, including a body, a hole slot is opened on the top of the body, a fixing plate is arranged on the top of the body, and four connecting bolts are arranged on the outside of the fixing plate to be fixed on the top of the body; a support plate is arranged inside the hole slot, a limit tube is arranged on the top of the support plate, and four groups of No. 1 springs are arranged at the four corners inside the support plate; the utility model is designed by adding a clamping structure outside the original tangent structure, and a motor drives the blade and the clamping structure, so as to clamp the thread end while cutting the thread, thereby avoiding the problem of the rope flying when the thread end breaks due to the tension provided by the wire feeding structure to the thread end; and by adding a spring and a bayonet design inside the hole slot, the tangent mechanism can be placed above the tray as a whole, and the tangent mechanism can be ejected by pressing the tray during maintenance, thereby simplifying the difficulty of cleaning and maintenance.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing machines, in particular to a short thread head cutting mechanism for sewing machines. 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 emergence of sewing machines has greatly improved the production efficiency of clothing and other products, allowing manual sewing to be replaced by large-scale mechanized production. It is widely used in many fields such as clothing manufacturing, home fabrics, leather products, etc., bringing great convenience to people's lives and production. At the end of the use of the sewing machine, a thread tangent mechanism is needed to cut the short thread ends.

[0003] The thread cutting mechanism of a sewing machine is generally composed of a thread cutting drive assembly, a thread cutting knife assembly, linkage components and a control system. The working principle of the thread cutting structure of a sewing machine is that when sewing is completed, the control system detects a signal and triggers the thread cutting drive assembly; the thread cutting drive assembly drives the linkage components to move the moving knife in the thread cutting knife assembly toward the fixed knife; the moving knife and the fixed knife engage with each other to cut the thread; during the thread cutting process, some auxiliary actions may be involved, such as loosening the thread, dividing the thread, etc., to ensure smooth thread cutting.

[0004] The existing thread cutting mechanism of a sewing machine has deficiencies in clamping the thread end when performing the thread cutting operation on the short thread end, which results in the problem that the thread will bounce off due to the tension when the thread breaks after the thread cutting is completed, because the thread feeding structure will provide a certain tension to the rope. In addition, the existing thread cutting mechanism is troublesome to disassemble for cleaning and maintenance. In addition, the existing thread cutting mechanism of a sewing machine will have residual thread ends and lint on the surface of the structure after long-term use, which will cause the mechanism to get stuck and clogged, thereby increasing the difficulty of maintenance. Therefore, a short thread cutting mechanism for a sewing machine is proposed to address the above problems. Utility Model Content

[0005] In order to make up for the deficiencies of the prior art and address the problems existing in the prior art equipment, the utility model proposes a short thread head cutting mechanism for a sewing machine.

[0006] The technical solution adopted by the utility model to solve the technical problem is a short thread head tangent mechanism of a sewing machine, comprising a body, a hole slot is opened on the top of the body, a fixing plate is arranged on the top of the body, four connecting bolts are arranged on the outside of the fixing plate to be fixed on the top of the body, a protective head is arranged on the top of the fixing plate, and a scraper is welded on the bottom end of the protective head; a support plate is arranged inside the hole slot, a limit tube is arranged on the top of the support plate, four groups of No. 1 springs are arranged at the four corners inside the support plate, one end of the No. 1 spring is welded to the top of the support plate, and the other end of the No. 1 spring is welded to the bottom end of the tray, and the top of the tray is welded to the bottom end of the tray. A support column is welded, and a driving rod is inserted inside the support column; a No. 1 support rod is welded on the top of the tray, and a fixing clamp is welded on the top of the No. 1 support rod, and a tangent structure is provided on one side of the fixing clamp, and the tangent structure includes a motor, and the output end of the motor is connected to the driving rod, and a fixing block is provided inside the driving rod near one end of the motor, and two groups of No. 2 springs are welded at both ends of the fixing block, and a column head is welded on the other end of the No. 2 spring, and a push plate is provided on one side of the column head, and a connecting plate is welded on one end of the push plate, and the connecting plate is welded inside and connected to the driving rod; the wire head is clamped and cut by this structure.

[0007] Preferably, the driving rod is externally connected with a movable clamp tube, and a jack is provided on the side of the movable clamp tube close to the movable clamp; a No. 2 support rod is welded to the top of the movable clamp tube, and a movable clamp is welded to the top of the No. 2 support rod; both ends of the driving rod are inserted into the pipe mouth, and two No. 3 support rods are welded to the center of the driving rod, and a blade is welded to the top of the No. 3 support rod; an exhaust fan is provided at the top of one side of the tray, and the output end of the exhaust fan is connected to the air inlet platform, a rectangular through hole is provided at the top of the air inlet platform, a baffle is inserted in the rectangular through hole, and a filter is provided at the bottom of the baffle; an air outlet is provided on one side of the exhaust fan, and broken wires and fluff are collected by using an exhaust fan with model FV-19CG2C, and the blade is driven to rotate by the driving rod to cut the thread ends.

[0008] Preferably, a connecting rod is welded to the bottom end of the tray, and a pin is welded to the other end of the connecting rod, and the pin is inserted into a slide groove, and the slide groove is a hole dug on one side of a limiting tube; a bayonet is provided at the corner of the slide groove; the bottom end of the limiting tube is welded to the top end of the support plate, thereby fixing the tangent structure by inserting the pin into the bayonet and fixing the tray under the hole groove by the bayonet.

[0009] Preferably, the four corners of the tray are wrapped by the protrusions of the support plate, and the wrapped part of the support plate is consistent with the diameter of the four corners of the tray; there is a gap between the push plate and the driving rod, and the length of the gap is consistent with the diameter of the outer tube of the movable clamping tube. Thus, the structure increases the stability and continuity of the operation of the mechanism by making the outer wall of the movable clamping tube close to the outer wall of the driving rod; and by making the protrusion of the support plate wrap the four corners of the tray.

[0010] The utility model is beneficial in that:

[0011] The utility model adopts the design of adding a clamping structure outside the original tangent structure, and drives the blade and the clamping structure through a motor, so as to clamp the thread end while tangent, thereby avoiding the problem of the rope flying away when the thread end is broken due to the tension provided by the wire feeding structure to the thread end; and by adding a spring and a bayonet design inside the hole groove, the tangent mechanism can be placed above the tray as a whole, and the tangent mechanism can be ejected by pressing the tray during maintenance, thereby simplifying the difficulty of cleaning and maintenance; at the same time, by adding a protective head on one side of the fixed plate and a scraper on the bottom of the protective head, the remaining thread end can be cut off by using the scraper, and the protective head plays a protective role to avoid injuries to the operator; and by adding a fine ash structure on one side of the structure, the broken thread is adsorbed on the surface of the filter screen by the exhaust fan, thereby avoiding the situation of mechanism blockage and jamming. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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.

[0013] Figure 1 It is a schematic diagram of the overall structure of a sewing machine;

[0014] Figure 2 Schematic diagram of the internal structure of the hole slot;

[0015] Figure 3 It is a schematic diagram of the support column position structure;

[0016] Figure 4 Schematic diagram of the limit tube structure;

[0017] Figure 5 This is a schematic diagram of the internal structure of the column head;

[0018] Figure 6 is a schematic diagram of the tangent structure;

[0019] Figure 7 It is a schematic diagram of the protective scraper structure;

[0020] Figure 8 It is a schematic diagram of the ash absorption structure;

[0021] In the figure: 1. machine body; 2. sewing machine body; 3. connecting bolt; 4. fixing plate; 5. hole groove; 6. support plate; 7. tray; 8. fixing clamp; 9. No. 1 support rod; 10. motor; 11. No. 1 spring; 12. limit tube; 13. connecting rod; 14. slide groove; 15. bayonet; 16. latch; 17. movable clamp; 18. No. 2 support rod; 19. movable clamp tube; 20. pipe mouth; 21. No. 2 spring; 22. fixing block; 23. push plate; 24. column head; 25. connecting plate; 26. driving rod; 27. No. 3 support rod; 28. blade; 29. ​​socket; 30. protective head; 31. scraper; 32. support column; 33. baffle; 34. air inlet platform; 35. filter screen; 36. exhaust fan; 37. air outlet. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] See also Figure 1-8As shown, a short thread head cutting mechanism of a sewing machine comprises a body 1, a hole slot 5 is opened at the top of the body 1, a fixing plate 4 is arranged at the top of the body 1, four connecting bolts 3 are arranged on the outside of the fixing plate 4 to be fixed on the top of the body 1, a protective head 30 is arranged on the top of the fixing plate 4, and a scraper 31 is welded on the bottom of the protective head 30; a support plate 6 is arranged inside the hole slot 5, a limiting tube 12 is arranged on the top of the support plate 6, four groups of No. 1 springs 11 are arranged at the four corners inside the support plate 6, one end of the No. 1 spring 11 is welded to the top of the support plate 6, and the other end of the No. 1 spring 11 is welded to the bottom of a tray 7, a support column 32 is welded on the top of the tray 7, and a driving rod 26 is inserted inside the support column 32; a support plate 6 is welded on the top of the tray 7 A No. 1 support rod 9, a fixing clamp 8 is welded on the top of the No. 1 support rod 9, a tangent structure is provided on one side of the fixing clamp 8, and the tangent structure includes a motor 10, the output end of the motor 10 is connected to a driving rod 26, a fixing block 22 is provided inside the driving rod 26 close to the end of the motor 10, two groups of No. 2 springs 21 are welded at both ends of the fixing block 22, a column head 24 is welded on the other end of the No. 2 spring 21, a push plate 23 is provided on one side of the column head 24, a connecting plate 25 is welded on one end of the pushing plate 23, and a driving rod 26 is welded inside the connecting plate 25; the driving rod 26 is externally connected to a movable clamp tube 19, and a jack 29 is provided on the side of the movable clamp tube 19 close to the movable clamp 17; the top of the movable clamp tube 19 A No. 2 support rod 18 is welded at the end, and a movable clamp 17 is welded at the top of the No. 2 support rod 18; both ends of the driving rod 26 are inserted into the pipe mouth 20, and two No. 3 support rods 27 are welded at the center of the driving rod 26, and a blade 28 is welded at the top of the No. 3 support rod 27; when the operation of the sewing machine body 2 is completed and the short thread head is cut, the operator starts the motor 10 at this time. At this time, driven by the motor 10, the driving rod 26 support column 32 is used as a fulcrum to start rotating, and through the column head 24, it pushes and rotates the movable clamp tube 19. At this time, the movable clamp 17 located at the top of the movable clamp tube 19 starts to rotate and contacts with the fixed clamp 8. Then, under the reverse push of the fixed clamp 8, the movable clamp tube 19 starts to stop transferring and passes The column head 24 is pushed into the driving rod 26 from the insertion hole 29 through the pushing plate 23, and then the driving rod 26 continues to rotate and the No. 2 support rod 18 and the No. 3 support rod 27 outside it drive the blade 28 to rotate, thereby performing a wire cutting operation on the rope, and then the motor 10 starts to reversely drive the driving rod 26 to rotate, and makes the column head 24 turn to the end of the pushing plate 23, at this time, under the push of the No. 2 spring 21, the column head 24 passes through the pipe mouth 20 and pops out from the insertion hole 29, and the column head 24 is inserted into the movable clamp tube 19, and drives the movable clamp 17 to open; finally, the operator wraps the remaining thread head around the scraper 31 and finally pulls the two ends of the thread head for cutting, during which it is protected by the protective head 30, thereby completing the wire cutting operation on the short thread head.

[0024] The bottom end of the tray 7 is welded with a connecting rod 13, and the other end of the connecting rod 13 is welded with a pin 16, and the pin 16 is inserted into the inside of the slide slot 14, and the slide slot 14 is a hole dug on one side of the limit tube 12; a bayonet 15 is provided at the corner of the slide slot 14; when the tangent structure is inspected and repaired, the operator removes the connecting bolt 3, then removes the fixing plate 4, and then presses the tray 7, at which time the connecting rod 13 begins to descend and compresses the No. 1 spring 11, and then drives the pin 16 through the connecting rod 13 to pop out from the bayonet 15 inside the slide slot 14, and then releases the tray 7. Under the action of the No. 1 spring 11, the tray 7 is pushed out, and the tangent mechanism is taken out, and then the mechanism can be inspected and repaired; after the inspection and maintenance, the operator puts the tangent mechanism back to its original place, and then pushes the tray 7, at this time the tray 7 starts to descend, at this time the connecting rod 13 starts to descend and compresses the No. 1 spring 11, and then drives the latch 16 through the connecting rod 13, and sends the latch 16 from the slide slot 14 to the bayonet 15, and then the tray 7 is sent away, at this time the No. 1 spring 11 lifts the tray 7 and fixes the latch 16 at the top of the bayonet 15, thereby completing the installation operation of the tangent structure.

[0025] An exhaust fan 36 is provided at the top of one side of the tray 7, and the output end of the exhaust fan 36 is connected to the air inlet platform 34. A rectangular perforation is opened at the top of the air inlet platform 34, and a baffle 33 is inserted inside the rectangular perforation. A filter screen 35 is provided at the bottom end of the baffle 33; an air outlet 37 is provided on one side of the exhaust fan 36; during the operation of the structure or when cleaning the structure, the exhaust fan 36 is started by the operator, and the exhaust fan 36 will suck the airflow from the air inlet platform 34, and the broken wires and fluff on the surface of the mechanism are sucked into the air inlet platform 34 together. When the broken wires and fluff enter the air inlet platform 34, they will contact the filter screen 35 inside the air inlet platform 34, and thus the broken wires and fluff are adsorbed on the surface of the filter screen 35, and then the filtered air will be discharged from the structure through the air outlet 37, and finally the operator will pull out the baffle 33 from the rectangular perforation at the top of the air inlet platform 34, and clean the broken wires and fluff on the surface of the filter screen 35; thereby completing the cleaning operation of the broken wires and fluff on the surface of the structure.

[0026] Working principle, when the operation of the sewing machine body 2 is completed and the short thread head is cut, the operator starts the motor 10 at this time. At this time, driven by the motor 10, the driving rod 26 starts to rotate with the support column 32 as the fulcrum, and through the column head 24, pushes and rotates the movable clamp tube 19. At this time, the movable clamp 17 located at the top of the movable clamp tube 19 starts to rotate and contacts with the fixed clamp 8. Then, under the reverse push of the fixed clamp 8, the movable clamp tube 19 starts to stop transferring, and pushes the column head 24 from the socket 29 to the inside of the driving rod 26 through the push plate 23. Then, the driving rod 26 continues to rotate and makes the second support rod 18 and the third support rod 27 outside it drive the blade 28 to rotate, thereby cutting the rope line, and then the motor 10 starts to reverse drive the driving rod 26. The rod 26 rotates and causes the column head 24 to rotate to the end of the push plate 23. At this time, the column head 24 passes through the pipe mouth 20 and pops out from the socket 29 under the push of the No. 2 spring 21, and the column head 24 is inserted into the movable clamp tube 19, and drives the movable clamp 17 to open; finally, the operator wraps the remaining thread ends around the scraper 31 and finally pulls the two ends of the thread ends for cutting, during which the protective head 30 provides protection, thereby completing the tangent operation of the short thread ends; when inspecting and repairing the tangent structure, the operator removes the connecting bolt 3, then removes the fixing plate 4, and then presses the tray 7. At this time, the connecting rod 13 begins to descend and compresses the No. 1 spring 11, and then drives the latch 16 through the connecting rod 13 to pop out from the bayonet 15 inside the slide groove 14, and then releases it. Tray 7, at this time, under the action of No. 1 spring 11, tray 7 is pushed out, thereby taking out the cutting mechanism, and then the mechanism can be inspected and repaired; after the inspection and maintenance, the operator puts the cutting mechanism back to its original place, and then pushes tray 7, at this time tray 7 starts to descend, at this time the connecting rod 13 starts to descend and compresses No. 1 spring 11, and then drives the latch 16 through the connecting rod 13, and sends the latch 16 from the slide slot 14 to the bayonet 15, and then sends the tray 7 away, at this time the No. 1 spring 11 lifts the tray 7 and fixes the latch 16 at the top of the bayonet 15, thereby completing the installation operation of the cutting structure; an exhaust fan 36 is provided at the top of one side of the tray 7, and the output end of the exhaust fan 36 is connected to the air inlet platform 34, and the top of the air inlet platform 34 is opened with a rectangular shaped perforation, a baffle 33 is inserted inside the rectangular perforation, and a filter 35 is provided at the bottom of the baffle 33; an air outlet 37 is provided on one side of the exhaust fan 36; during the operation of the structure or when cleaning the structure, the exhaust fan 36 is started by the operator, and the exhaust fan 36 will suck the airflow into the air inlet platform 34, and the broken wires and fluff on the surface of the mechanism are sucked into the air inlet platform 34 together, and when the broken wires and fluff enter the air inlet platform 34, they will contact the filter 35 inside the air inlet platform 34, and thus the broken wires and fluff are adsorbed on the surface of the filter 35, and then the filtered air will be discharged from the structure through the air outlet 37, and finally the operator will pull out the baffle 33 from the rectangular perforation at the top of the air inlet platform 34, and clean the broken wires and fluff on the surface of the filter 35;This completes the cleaning operation of broken wires and fluff on the surface of the structure. ;

[0027] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0028] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, and these changes and improvements fall within the scope of the utility model to be protected.

Claims

1. A short thread cutting mechanism for a sewing machine, characterized in that: The invention comprises a machine body (1), wherein a hole groove (5) is formed at the top of the machine body (1), a fixing plate (4) is provided at the top of the machine body (1), four connecting bolts (3) are provided on the outside of the fixing plate (4) and fixed to the top of the machine body (1), a protective head (30) is provided on the top of the fixing plate (4), and a scraper (31) is welded to the bottom of the protective head (30); a support plate (6) is provided inside the hole groove (5), a limiting tube (12) is provided at the top of the support plate (6), four groups of No. 1 springs (11) are provided at the four corners inside the support plate (6), one end of the No. 1 spring (11) is welded to the top of the support plate (6), and the other end of the No. 1 spring (11) is welded to the bottom of a tray (7), a support column (32) is welded to the top of the tray, and the support column (32) A driving rod (26) is inserted inside; a No. 1 supporting rod (9) is welded to the top of the tray (7); a fixing clamp (8) is welded to the top of the No. 1 supporting rod (9); a tangent structure is provided on one side of the fixing clamp (8); the tangent structure comprises a motor (10); the output end of the motor (10) is connected to the driving rod (26); a fixing block (22) is provided inside the end of the driving rod (26) close to the motor (10); two groups of No. 2 springs (21) are welded at both ends of the fixing block (22); a column head (24) is welded to the other end of the No. 2 spring (21); a pushing plate (23) is provided on one side of the column head (24); a connecting plate (25) is welded to one end of the pushing plate (23); the connecting plate (25) is internally welded and connected to the driving rod (26).

2. A sewing machine short thread cutting mechanism according to claim 1, characterized in that: The driving rod (26) is connected to a movable clamp tube (19) around its exterior, and a plug hole (29) is provided on a side of the movable clamp tube (19) close to the movable clamp (17); a No. 2 support rod (18) is welded to the top of the movable clamp tube (19), and the movable clamp (17) is welded to the top of the No. 2 support rod (18); both ends of the driving rod (26) are inserted into the pipe mouth (20), two No. 3 support rods (27) are welded to the center of the driving rod (26), and a blade (28) is welded to the top of the No. 3 support rod (27).

3. A sewing machine short thread cutting mechanism according to claim 1, characterized in that: An exhaust fan (36) is provided at the top end of one side of the tray (7); the output end of the exhaust fan (36) is connected to an air inlet platform (34); a rectangular through hole is provided at the top end of the air inlet platform (34); a baffle (33) is inserted inside the rectangular through hole; a filter screen (35) is provided at the bottom end of the baffle (33); an air outlet (37) is provided at one side of the exhaust fan (36).

4. A sewing machine short thread cutting mechanism according to claim 1, characterized in that: A connecting rod (13) is welded to the bottom end of the tray (7), a latch (16) is welded to the other end of the connecting rod (13), the latch (16) is inserted into a slide groove (14), and the slide groove (14) is a hole dug on one side of the limiting tube (12); a bayonet (15) is provided at the corner of the slide groove (14).

5. A sewing machine short thread cutting mechanism according to claim 1, characterized in that: The bottom end of the limiting tube (12) is welded to the top end of the supporting plate (6).

6. A sewing machine short thread cutting mechanism according to claim 1, characterized in that: The four corners of the tray (7) are wrapped by the protrusions of the support plate (6), and the wrapped portion of the support plate (6) has the same diameter as the four corners of the tray (7).

7. A sewing machine short thread cutting mechanism according to claim 1, characterized in that: There is a gap between the push plate (23) and the drive rod (26), and the length of the gap is consistent with the diameter of the outer tube of the movable clamping tube (19).

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