Automatic thread trimming mechanism of sewing machine

Abstract

The utility model provides an automatic thread trimming mechanism of a sewing machine. The automatic thread trimming mechanism of the sewing machine comprises a bottom plate, an inserting plate, a shearing rod and a pushing piece. According to the automatic thread trimming mechanism of the sewing machine, the bottom plate is arranged, the inserting groove is formed in the bottom plate, the inserting plate is arranged in the inserting groove in the sliding mode, and the lower cutting edge and the receding position used for receding the upper cutting edge are arranged at one end of the inserting plate. The end, provided with the lower cutting edge, of the inserting plate can slide out of the bottom plate. Therefore, the lower cutting edge can slide out of the bottom plate. In the using process, when the sewing machine sews a product, the inserting plate slides into the bottom plate, and moving and conveying of the product are prevented from being affected. In the using process, conveying and sewing of products can be effectively prevented from being affected, and the sewing effect of the products is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of sewing, and in particular relates to an automatic thread trimming mechanism for a sewing machine. Background Art

[0002] After a sewing machine has finished sewing a single product, it needs to cut the sewing thread to facilitate sewing the next product or other parts of the product. Currently, a thread trimmer is typically installed on the side of the sewing machine to replace manual thread trimming and reduce operator labor. However, the thread trimmer typically requires the engagement of the upper and lower cutting edges to complete the thread trimming operation. However, the lower cutting edge of current thread trimmers is typically fixed to the operating table, which can easily interfere with the feeding of products and, in severe cases, squeeze and deform the product, thereby affecting the sewing quality. Utility Model Content

[0003] The embodiment of the utility model provides an automatic thread trimming mechanism for a sewing machine, which aims to solve the problem in the prior art that the thread trimming mechanism of a sewing machine easily affects the pushing of products during use, thereby affecting the sewing quality.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide an automatic thread trimming mechanism for a sewing machine, comprising:

[0005] A bottom plate, for fixing to the operating table of the sewing machine;

[0006] An inserting plate is slidably arranged on the bottom plate in a horizontal direction, and a lower cutting edge is arranged on the inserting plate;

[0007] a shearing rod, the middle portion of which is hingedly arranged on the base plate, the shearing rod having a degree of freedom of rotation along a pitch angle on the base plate, and an upper cutting edge for engaging with the lower cutting edge being provided on the shearing rod;

[0008] A pushing member is installed on the bottom plate, and a driving end of the pushing member is connected to the plugging plate to drive the plugging plate to move on the bottom plate.

[0009] In a possible implementation, the end of the inserting plate is bent downward to provide a guide portion for guiding the sewing thread to move above the inserting plate, and the guide portion is slidably provided on the operating table of the sewing machine.

[0010] In one possible implementation, a pushing portion is provided on the middle portion of the insert plate so as to protrude upward, and the pushing portion can abut against the end of the shear rod away from the upper cutting edge to push the shear rod to swing, and an elastic member is also provided between the shear rod and the base plate to pull the end of the shear rod with the upper cutting edge to swing upward.

[0011] In a possible implementation, the top surface of the pushing portion is an inclined surface, and the height of the pushing portion gradually decreases in a direction approaching the shear rod.

[0012] In a possible implementation, a guide wheel is rotatably provided at the end of the shear rod, and when the inserting plate moves toward the outside of the bottom plate, the pushing portion abuts against the guide wheel.

[0013] In one possible implementation, a mounting seat for mounting the shear rod is provided on the base plate, the middle part of the shear rod is hingedly provided on the mounting seat, the axis of the hinge shaft of the shear rod on the mounting seat is defined as the first direction, and a baffle is provided on the mounting seat, and the shear rod rests on the baffle to limit the movement of the shear rod along the first direction.

[0014] In a possible implementation, a blade is detachably mounted on the shear rod, and the upper cutting edge is located on the blade.

[0015] In a possible implementation, a retaining wall for limiting the upward movement of the blade is provided on the shear rod, and a pressing block for pressing the blade onto the shear rod can be detachably mounted on the shear rod.

[0016] Compared with the prior art, the solution shown in the embodiment of the present application is characterized by the provision of a base plate with a slot provided on the base plate, an insert plate slidingly arranged inside the slot, and a lower cutting edge and a clearance for avoiding the upper cutting edge provided at one end of the insert plate. The end of the insert plate provided with the lower cutting edge can slide out of the base plate. This allows the lower cutting edge to slide out of the base plate. During use, when the sewing machine is sewing a product, the insert plate slides into the base plate to avoid affecting the movement and transportation of the product. When the product is sewn, the pusher drives the insert plate to slide out from the base plate. After sliding out from the base plate, the insert plate is positioned below the sewing thread, so that the sewing thread is positioned at the lower cutting edge. The shear lever is pushed to swing so that the upper cutting edge on the shear lever engages with the lower cutting edge, thereby cutting the sewing thread. After cutting is completed, the shear lever drives the upper cutting edge to swing upward, and the pusher drives the insert plate to retract. During use, this effectively avoids affecting the transportation and sewing of the product, ensuring the sewing effect of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the installation structure of the automatic thread trimming mechanism of a sewing machine provided by an embodiment of the utility model;

[0018] Figure 2 A schematic structural diagram of the automatic thread trimming mechanism of a sewing machine provided by an embodiment of the utility model;

[0019] Figure 3 A schematic diagram of the installation structure of the shear rod provided in an embodiment of the utility model;

[0020] Figure 4 This is a schematic diagram of the installation structure of the blade provided in an embodiment of the utility model.

[0021] Description of reference numerals:

[0022] 1. Bottom plate; 2. Operating table; 3. Insert plate; 31. Guide part; 32. Pushing part; 4. Shear rod; 41. Guide wheel; 5. Pushing member; 6. Elastic member; 7. Mounting seat; 71. Baffle; 8. Blade; 9. Pressing block. DETAILED DESCRIPTION

[0023] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] Please also refer to Figures 1 to 4 , the automatic thread trimming mechanism of the sewing machine provided by the utility model is now described. The automatic thread trimming mechanism of the sewing machine includes a base plate 1, an inserting plate 3, a shearing rod 4 and a pushing member 5. The base plate 1 is used to be fixed to the operating table 2 of the sewing machine; the inserting plate 3 is slidably arranged on the base plate 1 in the horizontal direction, and a lower cutting edge is provided on the inserting plate 3; the middle part of the shearing rod 4 is hingedly arranged on the base plate 1, and the shearing rod 4 has the freedom to rotate along the pitch angle on the base plate 1, and an upper cutting edge for engaging with the lower cutting edge is provided on the shearing rod 4; the pushing member 5 is installed on the base plate 1, and the driving end of the pushing member 5 is connected to the inserting plate 3, and is used to drive the inserting plate 3 to move on the base plate 1.

[0025] Compared to the prior art, the automatic thread trimming mechanism for a sewing machine provided in this embodiment comprises a base plate 1 with a slot disposed therein, a plug plate 3 slidably disposed within the slot, and a lower cutting edge and a clearance for the upper cutting edge disposed at one end of the plug plate 3. The end of the plug plate 3 with the lower cutting edge can slide out of the base plate 1, thereby allowing the lower cutting edge to slide out of the base plate 1. During use, when the sewing machine is sewing a product, the plug plate 3 slides into the base plate 1 to avoid interfering with the product's movement and transport. When the product is sewn, the pusher 5 drives the plug plate 3 out of the base plate 1. Once the product is sewn, the pusher 5 drives the plug plate 3 to slide out of the base plate 1. Once the product is sewn, the plug plate 3 is positioned below the sewing thread, positioning the sewing thread at the lower cutting edge. The shear lever 4 is then pushed to swing, causing the upper cutting edge of the shear lever 4 to engage with the lower cutting edge, thereby cutting the sewing thread. After cutting is completed, the shear lever 4 drives the upper cutting edge to swing upward, and the pusher 5 retracts the plug plate 3. This effectively prevents interference with product transport and sewing, ensuring a perfect sewing effect.

[0026] Specifically, in this embodiment, an oblong through hole is provided at the end of the inserting plate 3 along the sliding direction of the inserting plate 3 , and the lower cutting edge is located on the inner wall of the oblong through hole.

[0027] Specifically, in this embodiment, when the base plate 1 is mounted on the operating table 2 of the sewing machine, the sliding direction of the inserting plate 3 and the conveying direction of the product are perpendicular to each other.

[0028] Specifically, in this embodiment, the pusher 5 is a push cylinder or an electric push rod. The control method of the working state of the pusher 5 adopts the existing technology and will not be elaborated here.

[0029] Specifically, in this embodiment, after the inserting plate 3 slides out from the bottom plate 1 , the lower cutting edge on the inserting plate 3 is in a state ready to engage with the upper cutting edge.

[0030] In some embodiments, the above-mentioned plugboard 3 can be used as follows Figure 2 、 Figure 3 See also Figure 2 、 Figure 3 The end of the insert plate 3 is bent downward and provided with a guide portion 31 for guiding the sewing thread to move above the insert plate 3. The guide portion 31 is slidably mounted on the operating table 2 of the sewing machine. The guide portion 31 is always located outside the base plate 1. The guide portion 31 is gradually bent downward in a direction away from the insert plate 3. The end of the guide portion 31 away from the insert plate 3 abuts against the operating table 2 of the sewing machine. Therefore, when the insert plate 3 slides out of the outside of the base plate 1, it can guide the sewing thread to move above the insert plate 3, so that the sewing thread is located above the lower cutting edge.

[0031] Optionally, in this embodiment, the sewing thread can be placed above the inserting plate 3 by an operator.

[0032] In some embodiments, the above-mentioned plugboard 3 can be used as follows Figure 2 、 Figure 3 See also Figure 2 、 Figure 3 The middle part of the inserting plate 3 protrudes upward and is provided with a pushing portion 32. The pushing portion 32 can abut against the end of the shearing rod 4 away from the upper cutting edge, and is used to push the shearing rod 4 to swing. An elastic member 6 is also provided between the shearing rod 4 and the base plate 1 for pulling the end of the shearing rod 4 with the upper cutting edge to swing upward. When the inserting plate 3 moves outward, the pushing portion 32 can abut against the end of the shearing rod 4, thereby driving the end of the shearing rod 4 away from the upper cutting edge to swing upward, so as to achieve the effect of the upper cutting edge swinging downward. When the pushing member 5 pushes the inserting plate 3 outward to a certain distance, the action of the upper cutting edge swinging downward can be achieved at the same time. The action of the shearing rod 4 and the inserting plate 3 can be completed by the pushing member 5 alone.

[0033] Specifically, in this embodiment, the elastic member 6 is a tension spring, one end of the elastic member 6 is mounted on the end of the shear rod 4 away from the upper cutting edge, and the other end is mounted on the base plate 1 .

[0034] In some embodiments, the pushing portion 32 may be configured as follows: Figure 2 、 Figure 3 See also Figure 2 、 Figure 3 The top surface of the pushing portion 32 is an inclined surface, and the height of the pushing portion 32 gradually decreases as it approaches the shear rod 4. The pushing portion 32 extends from the top surface of the bottom plate 1, which facilitates connection with the pushing member 5. At the same time, the top surface of the pushing portion 32 is an inclined surface. When the pushing portion 32 contacts the end of the shear rod 4, it can gradually push the shear rod 4 to swing the upper cutting edge downward, thereby achieving the operation of cutting the sewing thread.

[0035] In some embodiments, the shear bar 4 may be Figure 3 The structure shown. Figure 3 A guide wheel 41 is rotatably mounted on the end of the shear lever 4. When the inserting plate 3 moves outward from the base plate 1, the pusher 32 abuts against the guide wheel 41. A guide wheel 41 is rotatably mounted on the end of the shear lever 4. The axis of the guide wheel 41 is spaced parallel to the axis of the hinge of the shear lever 4 on the base plate 1. When the inserting plate 3 moves outward a certain distance, the guide wheel 41 abuts against the pusher 32, and the shear lever 4 is flipped by the guidance between the pusher 32 and the guide wheel 41.

[0036] In some embodiments, the bottom plate 1 may be formed as follows: Figure 3 The structure shown. Figure 3 The base plate 1 is provided with a mounting seat 7 for mounting the shear rod 4. The middle portion of the shear rod 4 is hingedly mounted on the mounting seat 7. The axis of the hinge shaft of the shear rod 4 on the mounting seat 7 is defined as the first direction. The mounting seat 7 is provided with a baffle 71. The shear rod 4 abuts against the baffle 71 to limit the movement of the shear rod 4 in the first direction. The top of the base plate 1 is provided with a mounting seat 7 for mounting the shear rod 4. The middle portion of the shear rod 4 is hingedly mounted on the mounting seat 7. The mounting seat 7 is provided with a baffle 71. The shear rod 4 abuts against the baffle 71, thereby preventing the shear rod 4 from moving in the first direction and ensuring the stability of the upper cutting edge position.

[0037] Optionally, in this embodiment, a mounting shaft is fixedly mounted on the baffle 71 , the shear rod 4 is rotatably mounted on the mounting shaft, and a limiting portion for limiting the shear rod 4 on the baffle 71 is provided on the mounting shaft.

[0038] Preferably, in this embodiment, there are two baffles 71 , which are respectively located on both sides of the shear rod 4 , and are used to limit the shear rod 4 from moving along the first direction, thereby effectively ensuring the position of the upper cutting edge.

[0039] In some embodiments, the shear bar 4 may be Figure 4 The structure shown. Figure 4 , a blade 8 is detachably mounted on the shear rod 4, and the upper cutting edge is located on the blade 8. A blade 8 is detachably mounted on the end of the shear rod 4, and the upper cutting edge is located on the blade 8, which is convenient for replacing the upper cutting edge and facilitating the position of the upper cutting edge in the later stage.

[0040] In some embodiments, the blade 8 may be Figure 4 The structure shown. Figure 4 The shear rod 4 is provided with a retaining wall for limiting the upward movement of the blade 8, and the shear rod 4 is also provided with a detachable pressure block 9 for pressing the blade 8 against the shear rod 4. A groove for mounting the blade 8 is provided at one end of the shear rod 4. The blade 8 is placed inside the groove, and the side of the blade 8 away from the upper cutting edge rests against the retaining wall. This improves the stability of the position of the blade 8 when cutting the sewing thread. The pressure block 9 is fixed to the shear rod 4 by bolts, and a protrusion is provided on the pressure block 9 for squeezing the blade 8 against the bottom of the groove. This further improves the stability of the fixation of the blade 8.

[0041] Preferably, in this embodiment, gaskets are provided between the blade 8 and the shear rod 4 and between the blade 8 and the pressure block 9. By adjusting the position of the gasket, the position of the blade 8 along the first direction can be adjusted to ensure effective engagement between the upper cutting edge and the lower cutting edge.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An automatic thread trimming mechanism for a sewing machine, characterized in that: include: A bottom plate (1) for fixing to an operating table (2) of a sewing machine; An inserting plate (3) is slidably arranged on the bottom plate (1) in a horizontal direction, and a lower cutting edge is provided on the inserting plate (3); A shear rod (4) is hingedly arranged at its middle portion on the base plate (1), the shear rod (4) having a degree of freedom of rotation along a pitch angle on the base plate (1), and an upper cutting edge for engaging with the lower cutting edge is provided on the shear rod (4); A pushing member (5) is mounted on the base plate (1), and a driving end of the pushing member (5) is connected to the plugging plate (3) for driving the plugging plate (3) to move on the base plate (1).

2. The automatic thread trimming mechanism for a sewing machine according to claim 1, wherein: The end of the inserting plate (3) is bent downwards and provided with a guide portion (31) for guiding the sewing thread to move above the inserting plate (3); the guide portion (31) is slidably arranged on the operating table (2) of the sewing machine.

3. The automatic thread trimming mechanism for a sewing machine according to claim 1, wherein: A pushing portion (32) is provided in the middle of the insert plate (3) and protrudes upward. The pushing portion (32) can abut against the end of the shear rod (4) away from the upper cutting edge to push the shear rod (4) to swing. An elastic member (6) is also provided between the shear rod (4) and the bottom plate (1) to pull the end of the shear rod (4) with the upper cutting edge to swing upward.

4. The automatic thread trimming mechanism for a sewing machine according to claim 3, wherein: The top surface of the pushing portion (32) is an inclined surface, and the height of the pushing portion (32) gradually decreases in a direction approaching the shear rod (4).

5. The automatic thread trimming mechanism for a sewing machine according to claim 3, wherein: A guide wheel (41) is rotatably provided at the end of the shear rod (4), and when the inserting plate (3) moves toward the outside of the bottom plate (1), the pushing portion (32) abuts against the guide wheel (41).

6. The automatic thread trimming mechanism for a sewing machine according to claim 1, wherein: A mounting seat (7) for mounting the shear rod (4) is provided on the base plate (1); the middle portion of the shear rod (4) is hingedly provided on the mounting seat (7); the axis of the hinge shaft of the shear rod (4) on the mounting seat (7) is defined as a first direction; a baffle (71) is provided on the mounting seat (7); the shear rod (4) abuts against the baffle (71) to limit the movement of the shear rod (4) along the first direction.

7. The automatic thread trimming mechanism for a sewing machine according to claim 1, wherein: A blade (8) is detachably mounted on the shear rod (4), and the upper cutting edge is located on the blade (8).

8. The automatic thread trimming mechanism for a sewing machine according to claim 7, wherein: The shear rod (4) is provided with a retaining wall for limiting the upward movement of the blade (8), and a pressing block (9) for pressing the blade (8) onto the shear rod (4) can also be detachably mounted on the shear rod (4).

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