Overedger

Abstract

The invention discloses an overedger, and relates to the field of sewing equipment. The overlock machine comprises a machine shell, a swing part, a thread passing sliding block and a cam, the swing part and the cam are rotationally arranged on the machine shell, and the cam is in rolling fit with the swing part and used for driving the swing part to swing; the thread passing sliding block is connected with the swing piece, and the thread passing sliding block is provided with a first thread passing hole for the upper looper thread to penetrate through and a second thread passing hole for the lower looper thread to penetrate through. The overlock machine can meet different tension requirements in the sewing process, fabric arching is prevented, and the sewing quality is improved.

Description

Technical Field

[0001] This invention relates to the field of sewing equipment, and more specifically, to an overlock sewing machine. Background Technology

[0002] Overlock sewing machines are mainly used for sewing elastic fabrics such as knitted fabrics. During the sewing process, the upper and lower looper mechanisms adjust the tension of the upper and lower looper threads through the thread guide mechanism.

[0003] Traditional thread guiding mechanisms typically include a oscillating thread guide mounted on the upper looper shaft and multiple fixed thread guides. As the upper looper shaft oscillates back and forth, the relative positions between the oscillating and fixed thread guides continuously change, causing the included angle in the thread guiding path to change continuously.

[0004] This structure causes the friction and tension experienced by the looper thread to fluctuate continuously during the feeding process, making it impossible to dynamically adapt to the tension requirements at different stages of the sewing process. Excessive tension can easily cause localized arching of the fabric between the left and right needles, seriously affecting the sewing quality. Summary of the Invention

[0005] The purpose of this invention is to provide an overlock sewing machine that can adapt to different tension requirements during the sewing process, prevent the fabric from bunching up, and improve sewing quality.

[0006] An embodiment of the present invention provides a technical solution: An overlock sewing machine includes a machine housing, a swinging component, a thread guide slider, and a cam. The swinging component and the cam are rotatably mounted on the machine housing. The cam rolls with the swinging component to drive the swinging component to swing. The thread guide slider is connected to the swinging component and has a first thread guide hole for an upper looper thread to pass through and a second thread guide hole for a lower looper thread to pass through.

[0007] In an optional embodiment, the overlock sewing machine further includes a main shaft, and the cam is drively connected to the main shaft for rotating under the drive of the main shaft; and / or, The cam has a wheel surface that rolls with the oscillating member, the wheel surface including a constant diameter region and a variable diameter region.

[0008] In an optional embodiment, the overlock sewing machine further includes a locking member, wherein the thread guide slider is slidably engaged with the swing member, and the locking member is engaged with the thread guide slider and the swing member to lock or release the locking of the thread guide slider.

[0009] In an optional embodiment, the swing member is provided with a sliding groove, the wire guide slider includes a connecting part and a wire guide part, the connecting part is located on one side of the swing member, and the locking member passes through the sliding groove and is threadedly engaged with the connecting part. One end of the wire guide is connected to the connecting part, and the other end extends to the other side of the swing member. The first wire guide hole and the second wire guide hole are disposed in the wire guide.

[0010] In an optional embodiment, the swing member includes a swing arm and a connecting arm, the swing arm and the connecting arm are located in the rotation plane of the cam, one end of the swing arm is rotatably connected to the housing, and the other end is connected to the connecting arm at an angle, the line guide slider is connected to the connecting arm, and the cam is in rolling engagement with the swing arm.

[0011] In an optional embodiment, the cam is located within the angle region formed by the rocker arm and the connecting arm; and / or, The cam rolls into contact with one end of the rocker arm near the connecting arm.

[0012] In an optional embodiment, the overlock sewing machine further includes an elastic reset member disposed between the machine housing and the swing member, which continuously applies an elastic force to the swing member to drive the swing member to maintain contact with the cam.

[0013] In an optional embodiment, the overlock sewing machine further includes an upper looper, a lower looper, a fixed thread guide, a first thread guide tube, and a second thread guide tube. The fixed thread guide, the first thread guide tube, and the second thread guide tube are all disposed on the machine housing. The upper looper thread led out from the first thread guide tube passes through the first thread guide hole and the fixed thread guide in sequence to reach the upper looper. The lower looper thread led out from the second thread guide tube passes through the second thread guide hole to reach the lower looper.

[0014] In an optional embodiment, the upper bend and the lower bend are located on one side of the thread guide slider in the horizontal direction, and the fixed thread guide is located between the thread guide slider and the upper bend in both the horizontal and vertical directions.

[0015] In an optional embodiment, in the horizontal direction, the first wire guide tube and the second wire guide tube are located on the side of the wire guide slider away from the upper bend needle, and in the vertical direction, the first wire guide tube and the second wire guide tube are located above the wire guide slider.

[0016] Compared to existing technologies, the overlock sewing machine provided by this invention has a thread guide slider mounted on a swinging component. The swinging component is driven by a cam, unlike the traditional thread guide mechanism where the swinging thread guide is directly driven by the main shaft. This allows the swinging component to swing to different degrees at different stages of the sewing process, adapting to the stress requirements of different stages and preventing the upper and lower looper threads from being subjected to unstable friction and tension fluctuations, thus avoiding fabric bulging. Therefore, the beneficial effects of the overlock sewing machine provided by this invention include: adapting to different tension requirements during the sewing process, preventing fabric bulging, and improving sewing quality. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of the present invention and should not be considered as limiting the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A partial structural schematic diagram of an overlock sewing machine provided for an embodiment of the present invention; Figure 2 for Figure 1 Enlarged view of region A in the middle; Figure 3 A schematic diagram of the connection structure of the cam, the oscillating component, and the line-passing slider from a first-view perspective; Figure 4 This is a schematic diagram of the connection structure of the cam, the oscillating component, and the line-passing slider from a second perspective.

[0019] Icons: 100-Overlock sewing machine; 110-Machine housing; 120-Swing component; 121-Groove; 122-Swing arm; 123-Connecting arm; 130-Thread guide slider; 131-First thread guide hole; 132-Second thread guide hole; 133-Connecting part; 134-Thread guide part; 140-Cam; 150-Main shaft; 160-Locking component; 170-Elastic reset component; 181-Fixed thread guide component; 182-First thread guide tube; 183-Second thread guide tube. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of this invention, it should be understood that the terms "upper," "lower," "inner," "outer," "left," "right," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used to facilitate the description of this invention and to simplify the description, 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 invention.

[0024] Furthermore, the terms "first," "second," etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.

[0025] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, terms such as "set" and "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0026] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0027] Example Please refer to the following: Figure 1 and Figure 2 , Figure 1 The diagram shown is a partial structural schematic of the overlock sewing machine 100 provided in this embodiment. Figure 2 As shown Figure 1 An enlarged schematic diagram of region A in the middle.

[0028] The overlock sewing machine 100 provided in this embodiment includes a machine housing 110, a thread guiding mechanism, a main shaft 150, an upper looper, and a lower looper. The thread guiding mechanism includes a swing member 120, a thread guiding slider 130, a cam 140, a fixed thread guiding member 181, a first thread guiding tube 182, and a second thread guiding tube 183. The swing member 120 and the cam 140 are rotatably mounted on the machine housing 110, and the cam 140 rolls with the swing member 120 to drive the swing member 120 to swing. The thread guiding slider 130 is connected to the swing member 120, and the thread guiding slider 130 is provided with a first thread guiding hole 131 for the upper looper thread to pass through, and a second thread guiding hole 132 for the lower looper thread to pass through. The fixed thread guiding member 181, the first thread guiding tube 182, and the second thread guiding tube 183 are all fixedly mounted on the machine housing 110.

[0029] In practical applications, the upper looper thread led out of the first thread guide tube 182 passes through the first thread guide hole 131 and the fixed thread guide component 181 before reaching the upper looper, and the lower looper thread led out of the second thread guide tube 183 passes through the second thread guide hole 132 before reaching the lower looper. During the oscillation of the oscillating component 120 driven by the cam 140, the oscillating component 120 drives the thread guide slider 130 to move, thereby realizing the tension adjustment of the upper and lower looper threads.

[0030] Specifically, the upper and lower bends are located on one side of the line guide slider 130 in the horizontal direction. Figure 1 In the shown state, the upper and lower bends are located to the left of the wire guide slider 130. The fixed wire guide 181 is positioned between the wire guide slider 130 and the upper bend in both the horizontal and vertical directions.

[0031] In fact, in this embodiment, the cam 140 rotates in a vertical plane, and the oscillating member 120 oscillates in a vertical plane. It should be noted that the relative positional relationship related to the line-passing slider 130 in this embodiment refers to the condition that the line-passing slider 130 is satisfied at any position within its stroke.

[0032] In the horizontal direction, the first wire guide tube 182 and the second wire guide tube 183 are located on the side of the wire guide slider 130 away from the upper bend needle, that is, in Figure 1 In the shown configuration, both the first wire guide tube 182 and the second wire guide tube 183 are located to the right of the wire guide slider 130. Vertically, the first wire guide tube 182 and the second wire guide tube 183 are located above the wire guide slider 130.

[0033] In other words, the upper bend needle wire led out from the first wire guide tube 182 extends to the lower left, passes through the first wire guide hole 131 on the wire guide slider 130, then extends to the upper left and passes through the fixed wire guide 181, and then extends to the upper left to reach the upper bend needle and pass through the needle hole of the upper bend needle; the lower bend needle wire led out from the second wire guide tube 183 extends to the lower left, passes through the second wire guide hole 132 on the wire guide slider 130, then extends to the upper left to reach the lower bend needle and pass through the needle hole of the lower bend needle.

[0034] As can be seen, for the upper bend thread, two turns are only generated at the thread guide slider 130 and the fixed thread guide 181, while for the lower bend thread, only one turn is generated at the thread guide slider 130. In fact, the fixed thread guide 181 in this embodiment is provided with a third thread guide hole, through which the upper bend thread passes.

[0035] The overlock sewing machine 100 provided in this embodiment has a thread guide mechanism containing only one fixed thread guide 181. Compared with the traditional thread guide mechanism, the number of fixed thread guides 181 is greatly reduced. This not only reduces the frictional force exerted by the fixed thread guide 181 when the upper and lower looper threads move at high speed, but also reduces the number of turns of the upper and lower looper threads during the swing of the swinging member 120. This allows for better control of the tension of the upper and lower looper threads, preventing excessive tension and effectively improving the problem of fabric arching between the left and right needles.

[0036] In another embodiment, depending on the actual application requirements, the fixed thread guide 181 can be omitted to further reduce the friction of the upper looper thread. That is, after the upper looper thread passes through the first thread guide hole 131 on the thread guide slider 130, it extends to the needle hole through the upper looper.

[0037] Please refer to the following: Figure 3 and Figure 4 , Figure 3 The diagram shown is a schematic representation of the connection structure of the cam 140, the oscillating member 120, and the line-guided slider 130 from a first-view perspective. Figure 4 The diagram shown is a schematic diagram of the connection structure of cam 140, oscillating member 120 and line slider 130 from a second perspective.

[0038] In this embodiment, the cam 140 is driven to rotate under the drive of the main shaft 150. Specifically, the cam 140 is connected to the main shaft 150 via the upper bend needle shaft. When the main shaft 150 rotates, it drives the upper bend needle shaft to oscillate within a certain range, thereby causing the cam 140 to move. The cam 140 then drives the oscillating member 120 to oscillate downwards, thus causing the wire guide slider 130 to move synchronously.

[0039] In another embodiment, the cam 140 may also be connected to the main shaft 150 by other intermediate transmission structures, or the cam 140 may be driven by a separate drive device, such as a motor.

[0040] In this embodiment, the cam 140 has a wheel surface that rolls with the oscillating member 120. The wheel surface includes a constant diameter area and a variable diameter area. Taking the highest point of the needle as the starting 0° of the main shaft 150, as the main shaft 150 rotates from 0° to 120°, the lower looper will gradually move from the rightmost end to the left. The stitches on the upper part of the needle plate tongue will gradually move forward to disengage from the needle plate tongue. If the tension of the lower looper thread is too high at this time, it will over-tear the lower looper. Since the lower looper thread is intertwined with the needle thread, the left and right needle threads will be too close together, causing the middle fabric to bulge.

[0041] Therefore, during the rotation of the spindle 150 from 0° to 120°, the equal diameter area on the wheel surface of the cam 140 rolls relative to the oscillating member 120, and the oscillating member 120 does not oscillate, that is, the position of the thread slider 130 does not change, so that the lower looper thread maintains a low tension.

[0042] During the rotation of the main shaft 150 from 120° to 200°, the lower looper first moves to the leftmost end and then moves to the right. During this process, the upper looper thread, lower looper thread, and needle thread of the current stitch count are drawn into the bottom of the needle plate. During this process, a portion of the variable diameter area on the wheel surface of the cam 140 rolls relative to the oscillating member 120. The oscillating member 120 swings downward, driving the thread guide slider 130 to move to the lower left, which slightly increases the tension of the lower looper thread, making the lower looper thread fit the fabric more closely, thereby improving the thread spalling phenomenon.

[0043] As the main shaft 150 rotates from 200° to 360°, the lower looper gradually moves to the rightmost end, and the stitched portion on the needle plate tongue gradually detaches from the needle plate tongue. During this process, the remaining portion of the variable diameter area rolls relative to the oscillating member 120, the cam 140 gradually returns to its initial position, and the oscillating member 120 swings upward, driving the thread guide slider 130 to reset. During this process, the tension of the lower looper thread no longer increases, and the threads of the left and right needles are not pulled, thus preventing fabric from arching. In this embodiment, the movement of the thread guide slider 130 to the lower left is relatively small, so the increase in tension is not excessive.

[0044] As can be seen, this embodiment provides an overlock sewing machine 100, which drives the swinging component 120 to swing through the cam 140. This allows the swinging component 120 to swing to different degrees at different stages of the sewing process, so as to adapt to the stress requirements at different stages, obtain better sewing results, and avoid fabric arching.

[0045] The swing member 120 includes a swing arm 122 and a connecting arm 123. The swing arm 122 and the connecting arm 123 are located in the rotation plane of the cam 140. One end of the swing arm 122 is rotatably connected to the housing 110, and the other end is connected to the connecting arm 123 at an angle. The line slider 130 is connected to the connecting arm 123. The cam 140 is located in the angled area formed by the swing arm 122 and the connecting arm 123, and the cam 140 and the end of the swing arm 122 near the connecting arm 123 are in rolling engagement.

[0046] The cam 140 is positioned above the rocker arm 122. The end of the rocker arm 122 near the connecting arm 123 has a convex arc surface. The wheel surface of the cam 140 maintains contact with this convex arc surface, and the two roll relative to each other during the rotation of the cam 140, thereby driving the rocker arm 122 to swing downwards. One end of the connecting arm 123 is connected to the rocker arm 122, and the other end extends upwards. The line-guided slider 130 is connected to the connecting arm 123.

[0047] In this embodiment, the thread guide slider 130 and the swing member 120 are in sliding engagement. The position of the thread guide slider 130 on the swing member 120 can be adjusted according to actual application conditions to adapt to the thread stress requirements of different fabrics. The overlock sewing machine 100 provided in this embodiment also includes a locking member 160, which cooperates with the thread guide slider 130 and the swing member 120 to lock or release the locking of the thread guide slider 130.

[0048] Specifically, a groove 121 is provided through the connecting arm 123 of the swing member 120. The wire guide slider 130 includes a connecting part 133 and a wire guide part 134. The connecting part 133 is located on one side of the connecting arm 123, and the locking member 160 passes through the groove 121 and is threadedly engaged with the connecting part 133. One end of the wire guide part 134 is connected to the connecting part 133, and the other end extends to the other side of the swing member 120. A first wire guide hole 131 and a second wire guide hole 132 are provided in the wire guide part 134.

[0049] In practical applications, the locking member 160 remains tightened, pressing against the connecting arm 123 to lock the wire guide slider 130. When it is necessary to adjust the position of the wire guide slider 130 on the connecting arm 123, the locking member 160 can be loosened to release the lock on the wire guide slider 130, and then the position of the wire guide slider 130 can be adjusted along the slide groove 121. After the position adjustment of the wire guide slider 130 is completed, the locking member 160 can be tightened again to relock the wire guide slider 130.

[0050] In another embodiment, depending on the actual application conditions, other mating structures can be used between the line slider 130 and the swing member 120 to adjust the relative position of the line slider 130, and other locking members 160 such as pins can be used to lock and unlock the line slider 130.

[0051] In addition, the overlock sewing machine 100 provided in this embodiment also includes an elastic reset member 170, which is disposed between the machine housing 110 and the swing member 120, and continuously applies an elastic force to the swing member 120 to drive the swing member 120 to maintain contact with the cam 140. Preferably, the elastic reset member 170 is a torsion spring.

[0052] In summary, the overlock sewing machine 100 provided in this embodiment has a simpler and more compact thread guide mechanism, which can better control the tension of the upper and lower looper threads, prevent excessive tension of the upper and lower looper threads, and adapt to different tension requirements during the sewing process as well as the tension requirements of different fabrics. It can effectively improve the problem of fabric arching between the left and right needles and improve sewing quality.

[0053] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An overlock sewing machine, characterized in that, The device includes a housing (110), a swing member (120), a thread guide slider (130), and a cam (140). The swing member (120) and the cam (140) are rotatably mounted on the housing (110). The cam (140) rolls with the swing member (120) to drive the swing member (120) to swing. The thread guide slider (130) is connected to the swing member (120) and is provided with a first thread guide hole (131) for the upper looper thread to pass through and a second thread guide hole (132) for the lower looper thread to pass through.

2. The overlock sewing machine according to claim 1, characterized in that, The overlock sewing machine (100) further includes a main shaft (150), and the cam (140) is drively connected to the main shaft (150) for rotating under the drive of the main shaft (150); and / or, The cam (140) has a wheel surface that rolls with the oscillating member (120), the wheel surface including a constant diameter region of the same diameter and a variable diameter region of varying diameter.

3. The overlock sewing machine according to claim 1, characterized in that, The overlock sewing machine (100) also includes a locking member (160), the thread guide slider (130) is slidably engaged with the swing member (120), and the locking member (160) is engaged with the thread guide slider (130) and the swing member (120) to lock the thread guide slider (130) or release the locking of the thread guide slider (130).

4. The overlock sewing machine according to claim 3, characterized in that, The swing member (120) is provided with a sliding groove (121) through it. The wire guide slider (130) includes a connecting part (133) and a wire guide part (134). The connecting part (133) is located on one side of the swing member (120). The locking member (160) passes through the sliding groove (121) and is threadedly engaged with the connecting part (133). One end of the wire guide (134) is connected to the connecting part (133), and the other end extends to the other side of the swing member (120). The first wire guide hole (131) and the second wire guide hole (132) are provided in the wire guide (134).

5. The overlock sewing machine according to claim 1, characterized in that, The swing member (120) includes a swing arm (122) and a connecting arm (123). The swing arm (122) and the connecting arm (123) are located in the rotation plane of the cam (140). One end of the swing arm (122) is rotatably connected to the housing (110), and the other end is connected to the connecting arm (123) at an angle. The line slider (130) is connected to the connecting arm (123), and the cam (140) is in rolling engagement with the swing arm (122).

6. The overlock sewing machine according to claim 5, characterized in that, The cam (140) is located within the angled region formed by the rocker arm (122) and the connecting arm (123); and / or, The cam (140) rolls into contact with the end of the rocker arm (122) near the connecting arm (123).

7. The overlock sewing machine according to claim 1, characterized in that, The overlock sewing machine (100) also includes an elastic reset member (170), which is disposed between the machine housing (110) and the swing member (120) and continuously applies an elastic force to the swing member (120) to drive the swing member (120) to maintain contact with the cam (140).

8. The overlock sewing machine according to claim 1, characterized in that, The overlock sewing machine (100) also includes an upper looper, a lower looper, a fixed thread guide (181), a first thread guide tube (182), and a second thread guide tube (183). The fixed thread guide (181), the first thread guide tube (182), and the second thread guide tube (183) are all mounted on the machine housing (110). The upper looper thread led out from the first thread guide tube (182) passes through the first thread guide hole (131) and the fixed thread guide (181) in sequence before reaching the upper looper. The lower looper thread led out from the second thread guide tube (183) passes through the second thread guide hole (132) before reaching the lower looper.

9. The overlock sewing machine according to claim 8, characterized in that, The upper and lower bends are located on one side of the wire guide slider (130) in the horizontal direction. In both the horizontal and vertical directions, the fixed wire guide (181) is located between the wire guide slider (130) and the upper bend.

10. The overlock sewing machine according to claim 9, characterized in that, In the horizontal direction, the first wire guide tube (182) and the second wire guide tube (183) are located on the side of the wire guide slider (130) away from the upper bend needle. In the vertical direction, the first wire guide tube (182) and the second wire guide tube (183) are located above the wire guide slider (130).

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