Refit device for refitting industrial sewing machine into bead edge machine

Abstract

According to the technical scheme, the refitting device is characterized by comprising a base installed in a bottom shell of the industrial sewing machine, a main transmission shaft is rotationally arranged in the base, a first connecting rod mechanism is arranged on the main transmission shaft, and a second connecting rod mechanism is arranged on the first connecting rod mechanism. The first connecting rod mechanism is eccentrically connected with a lower shaft of the industrial sewing machine, a swing rod is arranged on the main transmission shaft, a thread hooking curved needle is arranged on the swing rod and extends to the position below a sewing needle of the sewing machine, and a second connecting rod mechanism is arranged on the main transmission shaft and extends to the position below the sewing needle of the sewing machine. The second connecting rod mechanism comprises a steering joint and a thread feeding curved needle connected with the steering joint, the thread feeding curved needle is located below the sewing needle, and the swing direction of the thread feeding curved needle intersects with the swing direction of the thread hooking curved needle. The utility model has the advantages of simple and reliable structure and small occupied volume, and adopts tiny oil lubrication to save oil quantity.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, and more specifically to a modification device for modifying an industrial sewing machine into a bead edge machine. Background Art

[0002] The bead stitch of the bead edge machine is a single-line chain stitch, and its stitch characteristics are that it looks like a string of dripping water drops on the front of the sewing material, and like a hand-sewn stitch on the back. The stitch is beautiful and is widely loved by consumers. Many existing bead edge machines are modified from industrial sewing machines, that is, flat car sewing machines. The traditional modification structure is shown in the invention patent disclosed by announcement number CN102877222B. It uses structures such as bevel gears, occupies a large space, has a complex structure, and needs to open a groove at the front end of the bottom shell of the sewing machine for installation, which is troublesome to install. At the same time, due to the use of structures such as bevel gears, it also needs to be lubricated with oil in the oil tank, and the oil consumption is large. Utility Model Content

[0003] In view of the shortcomings of the prior art, the utility model provides a modification device for an industrial sewing machine to be converted into a bead edge machine, which has the advantages of simple and reliable structure and small occupied volume, and at the same time adopts micro-oil lubrication to save oil.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a modification device for modifying an industrial sewing machine into a bead edge machine, comprising a base installed inside the bottom shell of the industrial sewing machine, a main transmission shaft rotatably arranged in the base, a first connecting rod mechanism provided on the main transmission shaft, the first connecting rod mechanism is eccentrically connected to the lower shaft of the industrial sewing machine, a swing arm is provided on the main transmission shaft, a thread hooking curved needle is provided on the swing arm, the thread hooking curved needle extends to the bottom of the sewing needle of the sewing machine, a second connecting rod mechanism is provided on the main transmission shaft, the second connecting rod mechanism includes a steering joint and a thread feeding curved needle connected to the steering joint, the thread feeding curved needle is located below the sewing needle and its swinging direction intersects with the swinging direction of the thread hooking curved needle.

[0005] The utility model is further configured as follows: it comprises a hook needle installed parallel to the sewing needle, a hook groove inclined upward toward one side of the sewing needle is provided above the tip of the hook needle, and the hook groove is used for hooking the sewing thread.

[0006] The utility model is further configured as follows: a mounting sleeve is arranged on the swing rod, the thread hooking bending needle is slidably matched with the mounting sleeve, a strip hole is arranged on the thread hooking bending needle or the mounting sleeve, and the thread hooking bending needle and the mounting sleeve are screw-connected through the strip hole.

[0007] The utility model is further configured as follows: the first connecting rod mechanism includes a connecting rod crank A and a large connecting rod, one end of the connecting rod crank A is fixed on the main transmission shaft, and the other end is connected to one end of the large connecting rod through a joint bearing, and the other end of the large connecting rod is eccentrically fixed on the lower shaft of the sewing machine.

[0008] The utility model is further configured as follows: the second connecting rod mechanism includes a connecting rod crank B, one end of the connecting rod crank B is fixed on the main transmission shaft, and the other end is connected to one end of the steering joint through a joint bearing, and the other end of the steering joint is connected to the wire feeding curved needle through the joint bearing.

[0009] The utility model is further configured as follows: the wire feeding curved needle includes a first arm and a second arm arranged in an L shape, the first arm is connected to the steering joint, the second arm extends to the bottom of the machine needle and is provided with a slidably adjustable head at the end.

[0010] The utility model is further configured as follows: a rotating part is provided at the intersection of the first arm and the second arm, and the rotating part is rotatably matched with the base through a bearing.

[0011] The utility model is further configured as follows: protruding connecting ears are arranged on both sides of the base, and the connecting ears are detachably connected to the base of the sewing machine through screws.

[0012] In summary, the utility model has the following beneficial effects:

[0013] Compared with the prior art, the utility model is provided with a main transmission shaft in the base, and the power of the lower shaft of the sewing machine is transmitted to the main transmission shaft by the first connecting rod mechanism, and then the power is respectively transmitted to the thread hooking curved needle and the thread feeding curved needle by the main transmission shaft through the swing rod and the second connecting rod mechanism, and the beaded edge sewing is realized by coordinating the up and down reciprocating movements of the hooking needle and the sewing needle. The transmission structure of the utility model is simpler than the traditional structure, with fewer parts, less prone to damage, more reliable, and the corresponding stitches are more stable. At the same time, since the bearing components are used for linkage, only a little oil lubrication is required, which is more economical and does not damage the oil tank structure of the industrial sewing machine itself. Therefore, after removing the device and reinstalling the rotary hook on the lower shaft, it can be turned back into the flat car of the industrial sewing machine. After removing the rotary hook and installing the device, it can be converted into a beaded edge machine, which is very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the whole machine structure.

[0015] Figure 2 It is a schematic diagram of the enlarged structure of the modification device.

[0016] Figure 3 It is an enlarged schematic diagram of the modified device when preparing to hook the line.

[0017] Figure 4It is an enlarged schematic diagram of the structure when the modified device pulls the sewing thread.

[0018] Figure 5 It is an enlarged structural diagram when the hook moves upward to pull up the sewing thread.

[0019] Figure 6 It is a structural schematic diagram when the modification device is installed in the bottom shell.

[0020] Figure 7 It is an exploded diagram of the assembly structure of the modification device.

[0021] Figure numerals: 1. base; 2. main transmission shaft; 3. first connecting rod mechanism; 301. connecting rod crank A; 302. large connecting rod; 4. rocker arm; 401. thread hooking needle; 402. mounting sleeve; 5. second connecting rod mechanism; 501. steering joint; 502. thread feeding needle; 5021. first arm; 5022. second arm; 5023. head; 503. connecting rod crank B; 6. hook needle; 601. hook groove; 7. strip hole; 8. rotating part; 9. connecting ear; 10. oil tank; 11. lower shaft; 12. industrial sewing machine; 13. bottom shell; 14. sewing needle. DETAILED DESCRIPTION

[0022] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0023] This embodiment discloses a modification device for modifying an industrial sewing machine into a bead edge machine, such as Figure 1-7 As shown, it includes a base 1 installed inside the bottom shell 13 of the industrial sewing machine 12, a main transmission shaft 2 is rotatably arranged in the base 1, a first connecting rod mechanism 3 is arranged on the main transmission shaft 2, and the first connecting rod mechanism 3 is eccentrically connected to the lower shaft 11 of the industrial sewing machine 12, and is used to provide power to the main transmission shaft 2. For details, please refer to Figure 1-2 The modification device is mainly used to modify an industrial sewing machine 12, i.e., a flatbed sewing machine, into a beaded sewing machine. A rotary hook is generally installed in the bottom shell 13 of a normal flatbed sewing machine. In this embodiment, the rotary hook is removed and then the modification device is installed. After the rotation of the lower shaft 11 provides power, a swing rod 4 is arranged on the main transmission shaft 2. A thread hooking bend needle 401 is arranged on the swing rod 4. The thread hooking bend needle 401 extends below the sewing needle of the sewing machine. A second connecting rod mechanism 5 is arranged on the main transmission shaft 2. The second connecting rod mechanism 5 includes a steering joint 501 and a thread feeding bend needle 502 connected to the steering joint 501. The thread feeding bend needle 502 is located below the sewing needle and its swing direction intersects with the swing direction of the thread hooking bend needle 401. Therefore, the thread hooking bend needle 401 and the thread feeding bend needle 502 can swing under the drive of the main transmission shaft 2.

[0024] Furthermore, it also includes a hook needle 6 installed parallel to the sewing needle, and a hook groove 601 is provided above the tip of the hook needle 6, which is inclined upward to the side of the sewing needle, and the hook groove 601 is used to hook the sewing thread. Therefore, through the above modification, the industrial sewing machine can be converted into a bead edge machine for use, which is convenient and fast. It should be noted that the thread hooking principle of the bead edge machine modified by this modification device is the same as the existing technology, and the specific working principle will not be repeated, so the following will be explained. Figure 3-5 Briefly describe the thread hooking process of the device (the sewing thread is omitted in the figure):

[0025] Reference first Figure 3 When the hook needle 6 moves downward to the lowest point, the hook thread bend needle 401 hooks the sewing thread from the side of the sewing needle 14 and pulls it to the side of the hook needle 6. At this time, the thread feeding bend needle 502 moves between the sewing needle 14 and the hook needle 6 to further pull the thread pulled by the hook thread bend needle 401; Figure 4 , the sewing needle 14 and the hook needle 6 are kept at the lowest point, at which time the hook thread looper 401 passes over the hook needle 6, and the thread feeding looper 502 also passes over the hook needle 6, so the sewing thread is pulled between the hook thread looper 401 and the thread feeding looper 502 and the sewing thread is against the inner side of the hook needle 6; refer to Figure 5 , the hook needle 6 moves upward, hooks the thread inside it and pulls it upward, and at the same time, the hook needle 401 and the thread feeding needle 502 swing outward to release the thread, and the thread can be smoothly pulled upward. The subsequent cloth moves, and the hook needle moves downward again, the sewing thread is blocked by the cloth and escapes from the hook groove, and the empty hook needle moves downward to hook the thread again, and the process is repeated continuously. Therefore, the modified device meets the hooking action, and has a simpler structure, occupies a smaller volume, and has fewer parts than the prior art, is more reliable to use, and has more stable corresponding stitches.

[0026] Further, see Figure 2 and Figure 7 The swing rod 4 is provided with a mounting sleeve 402, the thread hooking needle 401 is slidably matched with the mounting sleeve 402, and the thread hooking needle 401 or the mounting sleeve 402 is provided with a strip hole 7, and the thread hooking needle 401 and the mounting sleeve 402 are screwed together through the strip hole 7. With the above structure, the position of the thread hooking needle 401 can be adjusted through the strip hole 7, which is convenient for maintenance and installation and debugging.

[0027] Furthermore, the first connecting rod mechanism 3 includes a connecting rod crank A301 and a large connecting rod 302, one end of the connecting rod crank A301 is fixed on the main transmission shaft 2, and the other end is connected to one end of the large connecting rod 302 through a joint bearing, and the other end of the large connecting rod 302 is eccentrically fixed to the lower shaft 11 of the sewing machine. Further, the second connecting rod mechanism 5 includes a connecting rod crank B503, one end of the connecting rod crank B503 is fixed on the main transmission shaft 2, and the other end is connected to one end of the steering joint 501 through a joint bearing, and the other end of the steering joint 501 is connected to the thread feeding looper 502 through a joint bearing. Through the above structure, the modified device is transmitted through the connecting rod, bearing and other structures, the action is very stable, and the friction is small, and it can be lubricated with a little oil (very little lubricating oil or grease).

[0028] Furthermore, the wire feeding bend needle 502 includes a first arm 5021 and a second arm 5022 arranged in an L shape, wherein the first arm 5021 is connected to the steering joint 501, and the second arm 5022 extends to the bottom of the machine needle and is provided with a slidably adjustable head 5023 at the end. Furthermore, a rotating part 8 is provided at the intersection of the first arm 5021 and the second arm 5022, and the rotating part 8 is rotatably matched with the base 1 through a bearing. Through the above structure, a simple direction adjustment of the wire feeding bend needle 502 is achieved, so that its swinging direction can cross with the wire hooking bend needle for wire pulling. At the same time, the adjustment structure at the head 5023 can be similar to the structure at the installation sleeve 402 and the wire hooking bend needle 401. Preferably, a strip hole is provided on the head 5023, and a mounting sleeve structure is also provided at the corresponding position of the second arm 5022, so that the screw passes through the strip hole to install the head 5023 on the second arm 5022, so that the position adjustment of the head 5023 can be facilitated, and it is also convenient for maintenance and installation and debugging.

[0029] Furthermore, the base 1 is provided with protruding connecting ears 9 on both sides, and the connecting ears 9 are detachably connected to the base of the sewing machine by screws (the screws are not shown in the figure). Figure 6 Due to the structural optimization of the modification device, the volume is reduced and only a small amount of oil is needed for lubrication. Therefore, there is no need to destroy the bottom shell structure. You only need to remove the rotary hook and install the modification device on the front end of the bottom shell 13, and then connect the first connecting rod mechanism 3 with the lower shaft 11 to modify it into a bead edge machine. If you want to restore it to a flat car, you only need to dismantle the modification device and reinstall the rotary hook. Compared with the prior art, which occupies a large volume, needs to destroy the front end structure of the bottom shell, takes oil from the oil tank 10 for lubrication, and cannot be restored after being modified into a bead edge machine, the present device avoids these problems well. Not only does it not need to destroy the bottom shell for installation, it is convenient and quick, and the user can restore it to a flat car according to needs, with more choices.

[0030] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the design concept of the present invention should be included in the protection scope of the present invention.

Claims

1. A modification device for modifying an industrial sewing machine into a bead edge machine, comprising a base (1) installed inside a bottom shell of the industrial sewing machine, characterized in that: A main transmission shaft (2) is rotatably arranged in the base (1), a first connecting rod mechanism (3) is arranged on the main transmission shaft (2), the first connecting rod mechanism (3) is eccentrically connected to the lower shaft of the industrial sewing machine, a swing rod (4) is arranged on the main transmission shaft (2), a thread hooking curved needle (401) is arranged on the swing rod (4), the thread hooking curved needle (401) extends to the bottom of the sewing needle of the sewing machine, and a second connecting rod mechanism (5) is arranged on the main transmission shaft (2), the second connecting rod mechanism (5) includes a steering joint (501) and a thread feeding curved needle (502) connected to the steering joint (501), the thread feeding curved needle (502) is located below the sewing needle and its swing direction intersects with the swing direction of the thread hooking curved needle (401).

2. The device for converting an industrial sewing machine into a bead edge machine according to claim 1, characterized in that: It comprises a hook needle (6) installed parallel to the sewing needle, and a hook groove (601) inclined upward toward the side of the sewing needle is provided above the tip of the hook needle (6), and the hook groove (601) is used to hook the sewing thread.

3. The device for converting an industrial sewing machine into a bead edge machine according to claim 1, characterized in that: The swing rod (4) is provided with a mounting sleeve (402), the thread hooking bending needle (401) is slidably matched with the mounting sleeve (402), and the thread hooking bending needle (401) or the mounting sleeve (402) is provided with a strip hole (7), and the thread hooking bending needle (401) and the mounting sleeve (402) are screwed together through the strip hole (7).

4. The device for converting an industrial sewing machine into a bead edge machine according to claim 1, characterized in that: The first connecting rod mechanism (3) comprises a connecting rod crank A (301) and a large connecting rod (302); one end of the connecting rod crank A (301) is fixed on the main transmission shaft (2), and the other end is connected to one end of the large connecting rod (302) via a joint bearing; the other end of the large connecting rod (302) is eccentrically fixed on the lower shaft of the sewing machine.

5. The device for converting an industrial sewing machine into a bead edge machine according to claim 1, characterized in that: The second connecting rod mechanism (5) comprises a connecting rod crank B (503), one end of which is fixed on the main transmission shaft (2), and the other end of which is connected to one end of the steering joint (501) via a joint bearing, and the other end of the steering joint (501) is connected to the wire feeding bending needle (502) via a joint bearing.

6. The device for converting an industrial sewing machine into a bead edge machine according to claim 1, characterized in that: The wire feeding curved needle (502) includes a first arm (5021) and a second arm (5022) arranged in an L shape, wherein the first arm (5021) is connected to the steering joint (501), and the second arm (5022) extends to the bottom of the machine needle and is provided with a slidably adjustable head (5023) at the end.

7. The device for converting an industrial sewing machine into a bead edge machine according to claim 6, characterized in that: A rotating part (8) is provided at the intersection of the first arm (5021) and the second arm (5022), and the rotating part (8) is rotatably matched with the base (1) via a bearing.

8. The device for converting an industrial sewing machine into a bead edge machine according to claim 1, characterized in that: Protruding connection ears (9) are provided on both sides of the base (1), and the connection ears (9) are detachably connected to the base of the sewing machine via screws.

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