Automatic thread trimming mechanism of box sewing machine

Abstract

The invention relates to the technical field of box sewing machine thread trimming, one embodiment of the invention provides an automatic thread trimming mechanism of a box sewing machine, the automatic thread trimming mechanism comprises a bottom plate, and further comprises a sewing opening, two rotating shafts, a blade, a swing mechanism, a driving mechanism and a thread pressing mechanism, the sewing opening is formed in the bottom plate, the two rotating shafts are rotationally connected to the top end of the bottom plate, and the blade is arranged on the bottom plate; the two rotating shafts are located on the two sides of the two sewing openings respectively, the two rotating shafts are both provided with blades, the two blades are opposite, the swing mechanism is arranged on the two rotating shafts, the driving mechanism is arranged at the top end of the bottom plate, the two thread pressing mechanisms are both arranged at the top end of the bottom plate and are opposite to the two blades respectively, and the swing mechanism is arranged on the two rotating shafts. By means of the technical scheme, the technical problems that in the prior art, after sewing is finished, operators need to cut off the carton manually through scissors, time and labor are wasted, and the carton sewing efficiency is reduced are solved.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the field of thread trimming technology for sewing machines, and more specifically, to an automatic thread trimming mechanism for a sewing machine. Background Technology

[0002] Cardboard boxes are widely used packaging products made of materials such as corrugated cardboard. Common classifications include corrugated cardboard boxes and single-layer cardboard boxes according to the materials used; three-layer, five-layer, and seven-layer cardboard boxes according to the number of layers; and box types such as box boxes, corrugated boxes, and top and bottom boxes according to the box type. Their structure is mainly composed of face paper, liner paper, core paper, and corrugated paper bonded together. They have the characteristics of good protective performance, low cost, easy processing, and lightweight and easy handling, and are widely used in packaging for industries such as industry, food, medicine, daily necessities, and gifts.

[0003] During the processing of cardboard boxes, most cardboard boxes are connected using a nailing machine. However, the nails used for nailing are made of metal and are prone to rusting, which can affect the connection of the cardboard boxes. To prevent the nails from rusting, some manufacturers use handheld sewing machines to connect the cardboard boxes by sewing. However, after sewing, the operators need to cut the seams manually with scissors. This method is time-consuming and labor-intensive, reducing the efficiency of cardboard box sewing. Summary of the Invention

[0004] To overcome the above-mentioned defects, embodiments of this disclosure provide an automatic thread-cutting mechanism for a carton sewing machine, which solves the technical problem that in the prior art, operators need to manually cut the thread with scissors after sewing, which is time-consuming and labor-intensive and reduces the sewing efficiency of cartons.

[0005] According to one aspect, at least one embodiment of this disclosure provides an automatic thread-cutting mechanism for a sewing machine, including a base plate, and further including: a sewing opening, a rotating shaft, a blade, a swing mechanism, a drive mechanism, and a thread-pressing mechanism. The sewing opening is opened on the base plate. Two rotating shafts are provided, each rotatably connected to the top of the base plate. The two rotating shafts are respectively located on both sides of two sewing openings. Each of the two rotating shafts is provided with a blade facing each other. The swing mechanism is provided on the two rotating shafts and is used to drive the two rotating shafts to swing relative to each other and drive the two blades to swing and cut the thread. The drive mechanism is provided at the top of the base plate and is used to drive the swing mechanism to operate. Two thread-pressing mechanisms are provided, each located at the top of the base plate, and each thread-pressing mechanism is facing the two blades.

[0006] To drive the two blades to swing relative to each other, the swing mechanism includes: a linkage block and a connecting rod. There are two linkage blocks, which are fixedly connected to two rotating shafts respectively. The two ends of the connecting rod are rotatably connected to the two linkage blocks respectively.

[0007] To drive two linkage blocks to swing relative to each other, the driving mechanism includes: a driving rod, a frame, a first electric cylinder, and a linkage assembly. The driving rod is fixedly connected to one side of one of the linkage blocks, the frame is fixedly connected to the top of the base plate, the first electric cylinder is installed on one side of the frame, and the linkage assembly is set on the driving rod to drive the driving rod and the linkage block to swing.

[0008] In order to drive the drive rod to swing, the linkage assembly includes a push plate and a push rod. The push plate is fixedly connected to the output end of the first electric cylinder, and both ends of the push rod are rotatably connected to the bottom ends of the drive rod and the push plate, respectively, through a rotating assembly.

[0009] To increase the stability of the push rod when rotating with the push plate and the drive rod, the rotating assembly includes a rotating rod and a rotating ring. There are two rotating rods, which are respectively fixedly connected to the bottom ends of the push plate and the drive rod. A rotating ring is rotatably connected to each of the two rotating rods, and the two ends of the push rod are respectively fixedly connected to the two rotating rings.

[0010] To support and fix the sewing thread during thread cutting, the thread pressing mechanism includes a thread pressing knife and a locking bolt. The thread pressing knife is located at the top of the base plate and has an adjustment groove. The locking bolt is located in the adjustment groove. The top of the base plate has a screw hole, and the locking bolt is threaded into the screw hole.

[0011] To increase the stability of the connecting rod when both ends rotate, two connecting shafts are fixedly connected to the top of the connecting rod. Rotation holes are opened on both linkage blocks, and the two connecting shafts are rotatably connected in the two rotation holes respectively.

[0012] To cut the suture, the two blades are located at the bottom of the two suture cutters.

[0013] To prevent the linkage from obstructing the swing of one of the linkage blocks during linkage transmission, one end of the linkage is rotatably connected to one of the linkage blocks, and the other end of the linkage is semi-circular, and the other semi-circular end of the linkage is rotatably connected to the other linkage block.

[0014] To prevent the thread from detaching from the suture cutter, the thread is confined to one end of the suture cutter, and an arc-shaped groove is provided at one end of both suture cutters.

[0015] The beneficial effects of the embodiments disclosed herein are as follows:

[0016] In this disclosure, the swing mechanism and drive mechanism facilitate the relative swinging of the two blades, and the thread pressing mechanism works in conjunction with the blades to cut the thread, thus automatically cutting the thread instead of requiring an operator, saving time and effort and improving thread cutting efficiency. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure in one embodiment of the present disclosure;

[0019] Figure 2 This is a structural schematic diagram from another angle in one embodiment of the present disclosure;

[0020] Figure 3 This is a schematic diagram of the structure of the swing mechanism, the drive mechanism, and the pressing mechanism in one embodiment of this disclosure;

[0021] Figure 4 This is a schematic diagram of the swing mechanism and drive mechanism in one embodiment of the present disclosure;

[0022] Figure 5 This is a schematic diagram of the wire pressing mechanism in one embodiment of the present disclosure;

[0023] Figure 6 For one embodiment of this disclosure Figure 2 A magnified structural diagram of point A in the middle;

[0024] Figure 7 For one embodiment of this disclosure Figure 2 A magnified structural diagram of point B in the middle section;

[0025] Figure 8 This is a schematic diagram of the swing mechanism, drive mechanism, and structure in one embodiment of the present disclosure;

[0026] Figure 9 This is a schematic diagram of the adjustment mechanism in one embodiment of the present disclosure.

[0027] In the diagram: 1. Base plate; 2. Sewing opening; 3. Rotating shaft; 4. Blade; 5. Linkage block; 6. Connecting rod; 7. Drive rod; 8. Frame; 9. First electric cylinder; 10. Push plate; 11. Push rod; 12. Rotating rod; 13. Rotating ring; 14. Seam presser; 15. Locking bolt; 16. Connecting shaft; 17. Sliding ring; 18. Adjusting plate; 19. Guide rod; 20. Motor plate; 21. Drive screw; 22. First motor; 23. Slide rod. Detailed Implementation

[0028] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0029] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0030] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0031] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0032] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0033] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0034] Example 1, as Figures 1 to 7As shown, an automatic thread-cutting mechanism for a sewing machine according to an embodiment of this disclosure is illustrated. It includes a base plate 1, and further comprises: a sewing opening 2, a rotating shaft 3, blades 4, a swing mechanism, a drive mechanism, and a thread-pressing mechanism. The sewing opening 2 is located on the base plate 1. Two rotating shafts 3 are provided, each rotatably connected to the top of the base plate 1, and located on opposite sides of the two sewing openings 2. Blades 4 are mounted on each of the two rotating shafts 3, facing each other. The swing mechanism is mounted on the two rotating shafts 3 to drive them to swing relative to each other and to move the two blades 4 to swing and cut the thread. The drive mechanism is located at the top of the base plate 1 to drive the swing mechanism. Two thread-pressing mechanisms are provided, each located at the top of the base plate 1, facing the two blades 4 respectively. The swing mechanism and drive mechanism facilitate the relative swinging of the two blades 4, and the thread-pressing mechanism, in conjunction with the blades 4, cuts the thread, replacing manual thread cutting, saving time and effort, and improving thread-cutting efficiency.

[0035] The swing mechanism includes a linkage block 5 and a connecting rod 6. Two connecting shafts 16 are fixedly connected to the top of the connecting rod 6. Each linkage block 5 has a rotating hole, and the two connecting shafts 16 are rotatably connected to the two rotating holes respectively. There are two linkage blocks 5, which are fixedly connected to two rotating shafts 3 respectively. The two ends of the connecting rod 6 are rotatably connected to the two linkage blocks 5 respectively. One end of the connecting rod 6 is rotatably connected to one of the linkage blocks 5, and the other end of the connecting rod 6 is semi-circular. The other semi-circular end of the connecting rod 6 is rotatably connected to the other linkage block 5. When the driving rod 7 swings, it drives one of the linkage blocks 5 to swing on the rotating shaft 3. The connecting rod 6, which is rotatably connected between the two linkage blocks 5, drives the two linkage blocks 5 to swing relative to each other. When the two linkage blocks 5 swing, they drive the two blades 4 to swing relative to each other.

[0036] The drive mechanism includes a drive rod 7, a frame 8, a first electric cylinder 9, and a linkage assembly. The drive rod 7 is fixedly connected to one side of one of the linkage blocks 5. The frame 8 is fixedly connected to the top of the base plate 1. The first electric cylinder 9 is mounted on one side of the frame 8. The linkage assembly is mounted on the drive rod 7 and is used to drive the drive rod 7 and the linkage block 5 to swing. The linkage assembly includes a push plate 10 and a push rod 11. The push plate 10 is fixedly connected to the output end of the first electric cylinder 9. Both ends of the push rod 11 are rotatably connected to the bottom of the drive rod 7 and the push plate 10 respectively through a rotating assembly. The rotating assembly includes a rotating rod 12 and a rotating ring 13. There are two rotating rods 12, which are fixedly connected to the bottom ends of the push plate 10 and the drive rod 7, respectively. A rotating ring 13 is rotatably connected to each of the two rotating rods 12. The two ends of the push rod 11 are fixedly connected to the two rotating rings 13, respectively. The push plate 10 is moved by the first electric cylinder 9. When the push plate 10 moves, it drives the push rod 11 to move. When the push rod 11 moves, due to the rotational connection between the push rod 11 and the drive rod 7, the drive rod 7 is driven to swing.

[0037] The pressing mechanism includes a pressing knife 14 and a locking bolt 15. One end of each of the two pressing knives 14 is provided with an arc-shaped groove. Two blades 4 are located at the bottom ends of the two pressing knives 14. The pressing knives 14 are set at the top of the base plate 1. An adjustment groove is provided on the pressing knife 14. The locking bolt 15 is located in the adjustment groove. A screw hole is provided at the top of the base plate 1. The locking bolt 15 is threaded into the screw hole. The pressing knife 14 moves on the locking bolt 15 through the adjustment groove, thereby adjusting the position of the pressing knife 14. The pressing knife 14 presses on the blades 4. The top of the blades 4 swings close to the bottom end of the pressing knife 14, thereby cutting the sewing thread.

[0038] Working principle: When it is necessary to cut the thread, the first electric cylinder 9 drives the push plate 10 to move. When the push plate 10 moves, it drives the push rod 11 to move. When the push rod 11 moves, due to the rotational connection between the push rod 11 and the drive rod 7, the drive rod 7 swings. When the drive rod 7 swings, it drives one of the linkage blocks 5 to swing on the rotating shaft 3. The connecting rod 6, which is rotatably connected between the two linkage blocks 5, drives the two linkage blocks 5 to swing relative to each other. When the two linkage blocks 5 swing, it drives the two blades 4 to swing relative to each other. When the blades 4 swing, they move on the locking bolt 15 through the adjustment groove on the suture cutter 14, thereby adjusting the position of the suture cutter 14. The suture cutter 14 presses on the blades 4, and the top of the blades 4 swings close to the bottom of the suture cutter 14, thereby cutting the thread.

[0039] Example 2, as Figures 8-9As shown, in order to adjust the cutting height of the blade 4, an automatic thread-cutting mechanism for a sewing machine in one embodiment of this disclosure includes an adjustment mechanism. The adjustment mechanism includes: a sliding ring 17, an adjustment plate 18, a guide rod 19, a motor plate 20, a drive screw 21, and a first motor 22. The sliding ring 17 is slidably connected to the slide shaft via a slide rod 23. A groove is formed on the circumferential surface of the sliding ring 17. One end of the adjustment plate 18 is slidably connected to the groove. The guide rod 19 is slidably connected to the base plate 1. The top end of the guide rod 19 is fixedly connected to the adjustment plate 18. The motor plate 20 is fixedly connected to the bottom end of the guide rod 19. Both ends of the drive screw 21 are rotatably connected to the adjustment plate 18 and the motor plate 20, respectively. A screw hole is formed on the base plate 1. The drive screw 21 is threadedly connected to the screw hole. The first motor 22 is installed at the bottom end of the motor plate 20. The output end of the first motor 22 passes through the motor plate 20 and is fixedly connected to the drive screw 21.

[0040] When the height of the blade 4 needs to be adjusted, the first motor 22 drives the drive screw 21 to rotate in the screw hole. When the drive screw 21 rotates, it drives the motor plate 20 and the adjusting plate 18 to move up and down. At this time, the guide rod 19 slides adaptively in the sliding hole, thereby driving the adjusting plate 18 to support the sliding ring 17 and the blade 4 to move up and down on the rotating shaft 3.

[0041] It should also be noted that when the rotating shaft 3 and the sliding ring 17 rotate, one end of the adjusting plate 18 slides in the groove opened on the sliding ring 17, so as not to affect the swing of the rotating shaft 3 and the blade 4.

[0042] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. An automatic thread-cutting mechanism for a box-sewing machine, comprising a base plate (1), characterized in that, Also includes: A sewing opening (2) is formed on the base plate (1); Two rotating shafts (3) are provided, and both rotating shafts (3) are rotatably connected to the top of the base plate (1). The two rotating shafts (3) are located on both sides of the two sewing openings (2). Blade (4), the blade (4) is provided on both of the two rotating shafts (3), and the two blades (4) are opposite to each other; A swing mechanism is provided on the two rotating shafts (3) for driving the two rotating shafts (3) to swing relative to each other and drive the two blades (4) to swing and cut the wire; A drive mechanism is provided at the top of the base plate (1) and is used to drive the swing mechanism to operate. The pressure mechanism is provided in two parts, both of which are located at the top of the base plate (1) and are respectively opposite to the two blades (4).

2. The automatic thread-cutting mechanism of a sewing machine according to claim 1, characterized in that, The swing mechanism includes: Linkage block (5), two linkage blocks (5) are provided, and the two linkage blocks (5) are respectively fixedly connected to the two rotating shafts (3); The connecting rod (6) is rotatably connected to two linkage blocks (5) at both ends.

3. The automatic thread-cutting mechanism of a sewing machine according to claim 2, characterized in that, The drive mechanism includes: A drive rod (7) is fixedly connected to one side of one of the linkage blocks (5); A frame (8) is fixedly connected to the top of the base plate (1); The first electric cylinder (9) is mounted on one side of the frame (8); A linkage component is provided on the drive rod (7) and is used to drive the drive rod (7) and the linkage block (5) to swing.

4. The automatic thread-cutting mechanism of a sewing machine according to claim 3, characterized in that, The linkage component includes: Push plate (10), which is fixedly connected to the output end of the first electric cylinder (9); The push rod (11) has two ends that are rotatably connected to the bottom ends of the drive rod (7) and the push plate (10) respectively via a rotating assembly.

5. The automatic thread-cutting mechanism of a sewing machine according to claim 4, characterized in that, The rotating assembly includes: Two rotating rods (12) are provided, and the two rotating rods (12) are respectively fixedly connected to the bottom end of the push plate (10) and the drive rod (7); Rotating ring (13) is rotatably connected to both of the two rotating rods (12), and the two ends of the push rod (11) are fixedly connected to the two rotating rings (13) respectively.

6. The automatic thread-cutting mechanism of a sewing machine according to claim 5, characterized in that, The wire pressing mechanism includes: A wire pressing knife (14) is provided on the top of the base plate (1), and an adjustment groove is provided on the wire pressing knife (14); A locking bolt (15) is located in the adjustment groove. A screw hole is provided at the top of the base plate (1), and the locking bolt (15) is threaded into the screw hole.

7. The automatic thread-cutting mechanism of a sewing machine according to claim 2, characterized in that, The top of the connecting rod (6) is fixedly connected to two connecting shafts (16), and each of the two linkage blocks (5) is provided with a rotating hole. The two connecting shafts (16) are respectively rotatably connected in the two rotating holes.

8. The automatic thread-cutting mechanism of a sewing machine according to claim 6, characterized in that, The two blades (4) are located at the bottom of the two crimping knives (14).

9. The automatic thread-cutting mechanism of a sewing machine according to claim 2, characterized in that, One end of the connecting rod (6) is rotatably connected to one of the linkage blocks (5), and the other end of the connecting rod (6) is semi-circular, and the other semi-circular end of the connecting rod (6) is rotatably connected to the other linkage block (5).

10. The automatic thread-cutting mechanism of a sewing machine according to claim 6, characterized in that, Both of the wire pressing knives (14) have an arc-shaped groove at one end.

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