Normal sewing machine with needle breaking prevention structure

Abstract

The utility model provides a lockstitch sewing machine with an anti-needle-breaking structure, which comprises a lockstitch sewing machine body with a bottom plate, the lockstitch sewing machine body is positioned on the bottom plate, the lockstitch sewing machine further comprises a material-pricking mechanism and the anti-needle-breaking structure, the material-pricking mechanism is arranged at one end of the lockstitch sewing machine body and is used for pricking a sewing needle into cloth, and the needle-breaking structure is arranged on the bottom plate. The needle breaking prevention structure comprises a backstitch key and a driving structure, and when an operator presses the backstitch key, the driving structure drives the needling mechanism to move until the sewing needle pierces the cloth and is located at the bottommost end. When backstitching work needs to be carried out, an operator firstly presses the backstitching key to drive the driving structure to enable the pricking mechanism and the sewing needle to move downwards until the pricking mechanism and the sewing needle are located at the bottommost end, due to the lever principle, when cloth is pulled at the moment, the sewing needle can be completely pulled by applying larger force than only when the needle point is located in the cloth, force generated on the cloth during backstitching is limited, and therefore the sewing needle can be completely pulled. Therefore, the situation of needle breakage during needle reversing is reduced, and the safety is improved.

Description

Technical Field

[0001] The utility model relates to the field of cloth sewing, in particular to a lockstitch sewing machine with a needle-breaking prevention structure. Background Art

[0002] The flat-bed sewing machine is a machine that uses a sewing thread to form a seam on the sewing material, so that one or more layers of sewing materials are interwoven or sewn together. The head of the flat-bed sewing machine is composed of four mechanisms: material piercing, thread hooking, thread picking, and material feeding, as well as auxiliary mechanisms such as winding, pressing, and dropping teeth. The movements of each mechanism are reasonably coordinated and work in a cycle to sew the sewing materials together.

[0003] When using a flat-bed sewing machine to sew fabric, sometimes you will encounter a situation where you need to reverse the stitch. During the reverse stitch process, the position of the needle when it stops cannot be determined. There is a probability that the needle will be in mid-air, and only the needle tip is inserted into the fabric. At this time, if you press the reverse stitch stroke key, the fabric will be pulled in the opposite direction by the feeding mechanism below, thereby bending the needle tip. When the needle continues to move, there is a probability that it will descend. Since the needle hole on the bottom plate of the flat-bed sewing machine is small, the needle tip in a bent state is difficult to align with the needle hole and enter. The needle tip hits the bottom plate next to the needle hole, causing the needle to break. Utility Model Content

[0004] In order to reduce the situation of needle breakage during reverse stitching, the present application provides a flat sewing machine with an anti-needle breakage structure.

[0005] The present application provides a lockstitch sewing machine with an anti-needle breakage structure adopts the following technical solution:

[0006] A flat sewing machine with an anti-needle breakage structure comprises a flat sewing machine body with a bottom plate, the flat sewing machine body is located on the bottom plate, and also comprises a material piercing mechanism and an anti-needle breakage structure, the material piercing mechanism is arranged on one end of the flat sewing machine body, the material piercing mechanism is used to pierce the sewing needle into the fabric, the anti-needle breakage structure comprises a reverse needle key and a driving structure, when the operator presses the reverse needle key, the driving structure drives the material piercing mechanism to move until the sewing needle pierces the fabric and is located at the bottom.

[0007] Through the above technical solution, when the backstitch work is required, the operator first presses the backstitch key to drive the driving structure to move the piercing mechanism and the sewing needle downward until they are at the bottom. Due to the lever principle, pulling the cloth at this time will require greater force to pull the sewing needle than when only the needle tip is in the cloth. The force exerted on the cloth during the backstitch is limited, thereby reducing the situation of needle breakage during the backstitch and increasing safety.

[0008] Preferably, the piercing mechanism includes a needle feeding structure and a thread hooking structure, the needle feeding structure includes a driving shaft, a first driven rod and a piercing rod, the driving shaft is connected to a power source, one end of the first driven rod is arranged on the driving shaft, and the other end of the first driven rod is arranged on the piercing rod, when the driving shaft rotates, the first driven rod drives the piercing rod to move in a vertical direction, and the thread hooking structure is used to follow the movement of the needle to tighten the thread.

[0009] Through the above technical solution, when the power source drives the driving shaft to rotate, the first driven rod drives the piercing rod to move in the vertical direction, thereby driving the sewing needle to perform a smooth and reliable needle feeding action.

[0010] Preferably, it also includes a thread hooking structure, which includes a second driven rod and a thread take-up rod, one end of the second driven rod is arranged on the driving shaft, and the other end of the second driven rod is arranged on the thread take-up rod, when the driving shaft rotates, the second driven rod drives the thread take-up rod to rotate.

[0011] Through the above technical solution, when threading in advance, the thread must pass through the thread take-up rod, so that when sewing, when the active shaft drives the first driven rod to move the piercing rod downward, the second driven rod moves toward the piercing rod and rotates the thread take-up rod upward to realize the function of automatic thread winding.

[0012] Preferably, the driving structure includes a first gear, a rack and a driving rod, one end of the rack is fixed behind the backstitch key, and the other end is arranged toward the wall of the sewing machine, the first gear is meshed with the rack, and the driving rod is linked with the first gear, and the length direction of the driving rod is perpendicular to the length direction of the rack. When the backstitch key is pressed, the rack is moved in the pressing direction, and the first gear is driven to drive the driving rod to rotate, and the driving rod rotates and abuts against the second driven rod, and the second driven rod is driven to rotate toward the piercing rod.

[0013] Through the above technical solution, when the reverse needle work is required, the reverse needle key is pressed, and the rack is pushed by the reverse needle key to move in the pressing direction. The first gear is driven by the rack to drive the driving rod to rotate, and the driving rod rotates and abuts against the second driven rod, and the second driven rod is driven to rotate toward the piercing rod, thereby driving the piercing rod to move downward. At the same time, the length of the reverse needle key is limited, so that the piercing rod can just be driven to stay in the lowest position.

[0014] Preferably, an amplifying structure is also included, which includes a second gear, the second gear is meshed with the first gear, the diameter of the second gear is smaller than the first gear, the driving rod is coaxially arranged with the second gear, and when the rack drives the first gear to rotate, the first gear drives the second gear to rotate.

[0015] Through the above technical solution, the second gear with a small diameter is driven by the first gear with a large diameter, so that the driving rod can rotate a larger radius.

[0016] Preferably, a reset member is included, the reset member includes a tension spring and a spring, the two ends of the tension spring are respectively arranged on the inner wall of the sewing machine and the driving rod, the tension spring is always in a stretched state, the spring is arranged on the reverse stitch key, the spring and the reverse stitch key are arranged on the same horizontal axis, and the spring is always in a stretched state.

[0017] Through the above technical solution, when the operator releases the reverse needle key, the driving rod will reset under the action of the tension spring, thereby driving the second gear to rotate, driving the first gear to rotate and finally driving the rack to push the reverse needle key to reset. At the same time, a spring is arranged on the reverse needle key to reduce the situation where the tension spring is not strong enough to reset the reverse needle key.

[0018] Preferably, a push switch is further included, wherein the push switch is arranged on the inner side of the sewing machine housing and opposite to the rack.

[0019] Through the above technical solution, when the rack presses the push switch, the flat-bed sewing machine changes the feeding direction, so that when switching back and forth between the forward and reverse stitch working states, it is necessary to press the reverse stitch key, thereby reducing the occurrence of needle breakage caused by pulling the fabric due to switching the working state.

[0020] The technical effects of this utility model are mainly reflected in the following aspects:

[0021] 1. The utility model has designed a needle-breaking prevention structure and reduces the chance of needle breaking during needle reversal through the lever principle, thus increasing safety.

[0022] 2. The utility model designs an amplification structure, and drives the second gear with a small diameter through the first gear with a large diameter, so that the driving rod can rotate a larger radius;

[0023] 3. The utility model arranges the push switch on the opposite side of the rack, so that the reverse stitch key needs to be pressed when switching between the forward and reverse stitch working states, thereby reducing the occurrence of needle breakage caused by pulling the fabric due to switching the working state. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present application;

[0025] Figure 2 This is a schematic diagram of the inner structure after part of the outer shell is removed according to an embodiment of the present application.

[0026] Figure numerals: 1. sewing machine body; 11. bottom plate; 2. piercing mechanism; 21. needle feeding structure; 211. driving shaft; 212. first driven rod; 213. piercing rod; 22. thread hooking structure; 221. second driven rod; 222. thread taking-up rod; 3. needle break prevention structure; 31. reverse needle key; 32. driving structure; 321. first gear; 322. rack; 323. driving rod; 4. sewing needle; 5. push switch; 6. amplification structure; 61. second gear; 7. reset member; 71. tension spring; 72. spring. DETAILED DESCRIPTION

[0027] The following is combined with Figure 1-2 , the specific implementation methods of the utility model are further described in detail to make the technical solution of the utility model easier to understand and grasp.

[0028] The present application embodiment discloses a lockstitch sewing machine with a needle breakage prevention structure:

[0029] Reference Figure 1-Figure 2 A flat sewing machine with an anti-needle breakage structure comprises a flat sewing machine body 1 with a bottom plate 11, the flat sewing machine body 1 is located on the bottom plate 11, and also comprises a piercing mechanism 2 and an anti-needle breakage structure 3, the piercing mechanism 2 is located at one end of the flat sewing machine body 1, the piercing mechanism 2 is used to pierce the sewing needle 4 into the fabric, the anti-needle breakage structure 3 comprises a reverse needle key 31 and a driving structure 32, when the operator presses the reverse needle key 31, the driving structure 32 drives the piercing mechanism 2 to move until the sewing needle 4 pierces the fabric and is located at the bottom. When reverse needle work is required, the operator first presses the reverse needle key 31, driving the driving structure 32 to move the piercing mechanism 2 and the sewing needle 4 downward until they are located at the bottom. Due to the principle of lever, pulling the fabric at this time will require a greater force to pull the sewing needle 4 than when only the needle tip is located in the fabric, and the force generated on the fabric during reverse needle work is limited, thereby reducing the situation of needle breakage during reverse needle work and increasing safety.

[0030] Reference Figure 2The piercing mechanism 2 includes a needle feeding structure 21 and a thread hooking structure 22. The needle feeding structure 21 includes a driving shaft 211, a first driven rod 212 and a piercing rod 213. The driving shaft 211 is connected to a power source, which may be a motor. The motor is located at the rear side of the driving shaft 211. The output end of the motor is connected to the power source. The output end of the motor can be easily rotated under the action of an external force. One end of the first driven rod 212 is fixed to the driving shaft 211, and the other end of the first driven rod 212 is fixed to the piercing rod 213. When the driving shaft 211 rotates, the first driven rod 212 drives the piercing rod 213 to move in a vertical direction. The thread hooking structure 22 is used to follow the movement of the sewing needle 4 to tighten the thread. The sewing needle 4 is located on one end of the piercing rod 213 away from the driving shaft 211. When the power source drives the driving shaft 211 to rotate, the first driven rod 212 drives the piercing rod 213 to move in a vertical direction, thereby driving the sewing needle 4 to perform a smooth and reliable needle feeding action.

[0031] Reference Figure 2 , and further includes a thread hooking structure 22, which includes a second driven rod 221 and a thread take-up rod 222. One end of the second driven rod 221 is fixed to the driving shaft 211, and the other end of the second driven rod 221 is fixed to the thread take-up rod 222. When the driving shaft 211 rotates, the second driven rod 221 drives the thread take-up rod 222 to rotate. When threading in advance, the thread must pass through the thread take-up rod 222, so that when sewing, when the driving shaft 211 drives the first driven rod 212 to move the piercing rod 213 downward, the second driven rod 221 moves toward the piercing rod 213, and rotates the thread take-up rod 222 to lift upward to achieve the function of automatic thread collection.

[0032] Reference Figure 2 The driving structure 32 includes a first gear 321, a rack 322 and a driving rod 323. One end of the rack 322 is fixed behind the back stitch key 31, and the other end is arranged toward the inner wall of the sewing machine. The first gear 321 is meshed with the rack 322, and the driving rod 323 is linked with the first gear 321. The length direction of the driving rod 323 is perpendicular to the length direction of the rack 322. When the back stitch key 31 is pressed, the rack 322 is moved in the pressing direction, and the first gear 321 is driven to drive the driving rod 323 to rotate. The driving rod 323 rotates and abuts against the second driven rod 221, and the second driven rod 221 is driven to rotate toward the piercing rod 213. When the reverse stitch work is required, the reverse stitch key 31 is pressed, and the rack 322 is pushed by the reverse stitch key 31 to move in the pressing direction. The first gear 321 is driven by the rack 322 to drive the driving rod 323 to rotate, and the driving rod 323 rotates and abuts against the second driven rod 221, and the second driven rod 221 is driven to rotate toward the piercing rod 213, thereby driving the piercing rod 213 to move downward. At the same time, the length of the reverse stitch key 31 is limited, so that the piercing rod 213 can be driven to stay in the lowest position.

[0033] Reference Figure 2 , and also includes a push switch 5, which is fixed on the inner side of the sewing machine housing and is located opposite to the rack 322. When the rack 322 presses the push switch 5, the sewing machine changes the feeding direction, so that the reverse stitch key 31 needs to be pressed when switching between the forward and reverse stitch working states, thereby reducing the occurrence of the situation where the fabric is pulled and the needle is broken due to switching the working state.

[0034] Reference Figure 2 , further comprising an amplifying structure 6, the amplifying structure 6 comprising a second gear 61, the second gear 61 meshing with the first gear 321, the diameter of the second gear 61 being smaller than the first gear 321, the driving rod 323 being coaxially fixed with the second gear 61, when the rack 322 drives the first gear 321 to rotate, the first gear 321 drives the second gear 61 to rotate. The first gear 321 with a larger diameter drives the second gear 61 with a smaller diameter, so that the driving rod 323 can rotate a larger radius.

[0035] Reference Figure 2 , including a reset member 7, the reset member 7 includes a tension spring 71 and a spring 72, the two ends of the tension spring 71 are respectively fixed on the inner wall of the sewing machine and the driving rod 323, the tension spring 71 is always in a stretched state, the spring 72 is fixed on the back stitch key 31, the spring 72 is arranged on the same horizontal axis as the back stitch key 31, and the spring 72 is always in a stretched state. When the operator releases the back stitch key 31, the driving rod 323 will be reset under the action of the tension spring 71, thereby driving the second gear 61 to rotate, driving the first gear 321 to rotate and finally driving the rack 322 to push the back stitch key 31 to reset, and at the same time fixing the spring 72 on the back stitch key 31, reducing the situation where the tension spring 71 is not strong enough to reset the back stitch key 31.

[0036] Of course, the above are only typical examples of the present invention. In addition, the present invention may have many other specific implementations. Any technical solutions formed by equivalent replacement or equivalent transformation fall within the scope of protection required by the present invention.

Claims

1. A flat sewing machine with a needle breakage prevention structure, comprising a flat sewing machine body (1) with a bottom plate (11), wherein the flat sewing machine body (1) is located on the bottom plate (11), characterized in that: The invention also comprises a material-piercing mechanism (2) and a needle-breakage prevention structure (3), wherein the material-piercing mechanism (2) is arranged on one end of the sewing machine body (1), and is used to pierce a sewing needle (4) into a fabric, and the needle-breakage prevention structure (3) comprises a reverse needle key (31) and a driving structure (32), and when an operator presses the reverse needle key (31), the driving structure (32) drives the material-piercing mechanism (2) to move until the sewing needle (4) pierces the fabric and is located at the bottom.

2. A lockstitch sewing machine with a needle breakage prevention structure according to claim 1, characterized in that: The piercing mechanism (2) comprises a needle feeding structure (21) and a thread hooking structure (22); the needle feeding structure (21) comprises a driving shaft (211), a first driven rod (212) and a piercing rod (213); the driving shaft (211) is connected to a power source; one end of the first driven rod (212) is arranged on the driving shaft (211); the other end of the first driven rod (212) is arranged on the piercing rod (213); when the driving shaft (211) rotates, the first driven rod (212) drives the piercing rod (213) to move in a vertical direction; the thread hooking structure (22) is used to follow the movement of the sewing needle (4) to tighten the thread.

3. A lockstitch sewing machine with a needle breakage prevention structure according to claim 2, characterized in that: The invention also comprises a thread hooking structure (22), wherein the thread hooking structure (22) comprises a second driven rod (221) and a thread take-up rod (222), wherein one end of the second driven rod (221) is arranged on the driving shaft (211), and the other end of the second driven rod (221) is arranged on the thread take-up rod (222), and when the driving shaft (211) rotates, the second driven rod (221) drives the thread take-up rod (222) to rotate.

4. A lockstitch sewing machine with a needle breakage prevention structure according to claim 3, characterized in that: The driving structure (32) comprises a first gear (321), a rack (322) and a driving rod (323); one end of the rack (322) is fixed behind the backstitch key (31), and the other end is arranged toward the wall of the sewing machine; the first gear (321) is meshed with the rack (322); the driving rod (323) is linked with the first gear (321); the length direction of the driving rod (323) is perpendicular to the length direction of the rack (322); when the backstitch key (31) is pressed, the rack (322) is moved in the pressing direction; the first gear (321) is driven to drive the driving rod (323) to rotate; the driving rod (323) rotates and abuts against the second driven rod (221); the second driven rod (221) is driven to rotate toward the piercing rod (213).

5. A lockstitch sewing machine with a needle breakage prevention structure according to claim 4, characterized in that: The invention also includes an amplifying structure (6), wherein the amplifying structure (6) includes a second gear (61), wherein the second gear (61) is meshed with the first gear (321), wherein the diameter of the second gear (61) is smaller than that of the first gear (321), and the driving rod (323) is coaxially arranged with the second gear (61). When the rack (322) drives the first gear (321) to rotate, the first gear (321) drives the second gear (61) to rotate.

6. The lockstitch sewing machine with a needle breakage prevention structure according to claim 3, characterized in that: The invention also comprises a reset member (7), wherein the reset member (7) comprises a tension spring (71) and a spring (72), wherein two ends of the tension spring (71) are respectively arranged on the inner wall of the sewing machine and the driving rod (323), wherein the tension spring (71) is always in a stretched state, and the spring (72) is arranged on the reverse stitch key (31), wherein the spring (72) and the reverse stitch key (31) are arranged on the same horizontal axis, and wherein the spring (72) is always in a stretched state.

7. The lockstitch sewing machine with a needle breakage prevention structure according to claim 1, characterized in that: It also includes a push switch (5), which is arranged on the inner side of the sewing machine housing and opposite to the rack (322).

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