Upper cutter device of sewing machine

Abstract

The utility model relates to the technical field of sewing, in particular to an upper cutter device of a sewing machine, which comprises a switching mechanism comprising a first driving component and a pin shaft, the pin shaft is provided with a locking position and a moving position, and the first driving component is used for driving the pin shaft to switch between the locking position and the moving position; the cutter mechanism is connected with the pin shaft; and the driving mechanism comprises a second driving assembly and a transmission assembly, the transmission assembly is connected with the pin shaft, and the second driving assembly is used for driving the pin shaft located at the movable position to move through the transmission assembly so as to drive the cutter mechanism to act. The switching mechanism is arranged to drive the pin shaft to be switched between the locking position and the moving position, the cutter can be switched to the working state in real time according to needs in the sewing process so as to cut leftover materials, sewing does not need to be stopped, and sewing efficiency is effectively guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing, in particular to a cutting device on a sewing machine. Background Art

[0002] A sewing machine is a machine that uses one or more sewing threads to form one or more stitches on the sewing material, so that one or more layers of sewing materials are interwoven or sewn together. A sewing machine can sew fabrics such as cotton, linen, silk, wool, and synthetic fibers, as well as products such as leather, plastic, and paper. The stitches are neat, beautiful, flat, and firm, and the sewing speed is fast and easy to use.

[0003] Generally, the lockstitch sewing machine is only used for ordinary sewing. If you need to cut off the excess scraps during the sewing process, you need to add a set of cutters, where the upper cutter is a movable design and the lower cutter is a fixed design. The vertical reciprocating motion of the upper cutter is used to cut the scraps. The current design structure of the upper cutter requires that sewing be stopped before the cutter can be switched to the working state and then cutting can be carried out, which greatly affects the sewing efficiency. Utility Model Content

[0004] The utility model aims to provide a cutting device on a sewing machine, which can switch the cutting knife to a working state in real time as needed during the sewing process to cut the scraps without stopping the sewing, thereby effectively ensuring the sewing efficiency.

[0005] In order to achieve the above object, the utility model provides a cutting device on a sewing machine, comprising:

[0006] The switching mechanism comprises a first driving assembly and a pin shaft, wherein the pin shaft has a locking position and a movable position, and the first driving assembly is used to drive the pin shaft to switch between the locking position and the movable position;

[0007] A cutting mechanism connected to the pin shaft;

[0008] The driving mechanism includes a second driving component and a transmission component, wherein the transmission component is connected to the pin shaft, and the second driving component is used to drive the pin shaft in the active position to move through the transmission component, thereby driving the cutter mechanism to move.

[0009] Optionally, the first drive assembly includes a first drive component, a connecting rod transmission unit and a switching crank unit, the two ends of the connecting rod transmission unit are respectively rotatably connected to the first drive component and the first end of the switching crank unit, the second end of the switching crank unit is rotatably connected to the pin shaft, and the first drive component is used to drive the transmission connecting rod to move and drive the switching crank unit to move, thereby driving the pin shaft to switch between the locked position and the active position.

[0010] Optionally, the first driving component is a wrench, the first end of the wrench is an operating end, and the second end of the wrench is rotatably connected to the connecting rod transmission unit and the casing of the sewing machine.

[0011] Optionally, the switching crank unit includes a first switching crank and a second switching crank, wherein two ends of the first switching crank are rotationally connected to the connecting rod transmission unit and the first end of the second switching crank respectively, and the second end of the second switching crank is rotationally connected to the pin shaft.

[0012] Optionally, the cutter mechanism includes a cutter rod, a cutter and a cutter crank arranged vertically, two ends of the cutter crank are rotatably connected to the pin shaft and the first end of the cutter rod respectively, and the second end of the cutter rod is fixedly connected to the cutter.

[0013] Optionally, the cutter device on the sewing machine further comprises a guide mechanism, which is connected to the top end of the cutter rod and is used to guide the vertical reciprocating motion of the cutter rod;

[0014] The guide mechanism comprises a guide groove and a connecting piece, one end of the connecting piece is connected to the top end of the cutter rod, and the other end is slidably arranged in the guide groove.

[0015] Optionally, the second driving assembly includes a second driving component and a main shaft, and both ends of the main shaft are respectively connected to the second driving component and the transmission assembly, and the second driving component is used to drive the main shaft to rotate, thereby driving the transmission assembly to move.

[0016] Optionally, the transmission assembly includes an eccentric crank, a transmission crank and a transmission shaft, the first end of the eccentric crank is mounted on the main shaft, the second end of the eccentric crank is rotatably connected to the transmission shaft, the first end of the transmission crank is rotatably connected to the transmission shaft, the second end of the transmission crank is fixedly connected to the pin shaft, the rotation of the main shaft can drive the eccentric crank to rotate, the rotation of the eccentric crank drives the transmission crank to reciprocate via the transmission shaft, and further drives the pin shaft to reciprocate.

[0017] Optionally, when the pin is in an active position, the vertical projections of the transmission shaft and the pin at least partially overlap; when the pin is in a locked position, the vertical projections of the transmission shaft and the pin do not overlap.

[0018] Optionally, the transmission assembly further comprises a limit crank, a first end of the limit crank being rotatably connected to a housing of the sewing machine, and a second end of the limit crank being rotatably connected to the transmission shaft.

[0019] In the cutter device on the sewing machine provided by the utility model, a switching mechanism is set to drive the pin shaft to switch between the locking position and the active position. The cutter can be switched to the working state in real time as needed during the sewing process to cut the scraps without stopping the sewing, thereby effectively ensuring the sewing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Those skilled in the art should understand that the drawings provided are for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention.

[0021] Figure 1-Figure 2 A schematic diagram of the structure of a cutting device on a sewing machine provided by an embodiment of the utility model at different viewing angles;

[0022] Figure 3 A schematic diagram of the structure of a pin shaft provided in an embodiment of the utility model when it is in an active position;

[0023] Figure 4 A schematic diagram of the structure of a pin shaft provided in an embodiment of the utility model when it is in a locked position;

[0024] Figure 5-Figure 6 This is a schematic structural diagram of a cutter device on a sewing machine provided by an embodiment of the utility model in different states when cutting cloth.

[0025] in:

[0026] 100-first drive assembly; 101-first drive component; 102-connecting rod transmission unit; 103-first switching crank; 104-second switching crank; 200-pin shaft; 300-cutter mechanism; 301-cutter rod; 302-cutter; 303-cutter crank; 400-second drive assembly; 401-spindle; 500-transmission assembly; 501-eccentric crank; 502-transmission crank; 503-transmission shaft; 504-limiting crank; 601-guide groove; 602-connecting piece. DETAILED DESCRIPTION

[0027] In order to make the purpose, advantages and features of the utility model clearer, the utility model is further described in detail in combination with the accompanying drawings and specific embodiments. It should be noted that the accompanying drawings are in a very simplified form and use non-precise proportions. They are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the utility model, and are not used to limit the limiting conditions for the implementation of the utility model. Therefore, they have no technical substantive significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed by the utility model without affecting the effects and purposes that can be achieved by the utility model.

[0028] It should also be understood that, unless otherwise specified or indicated, the terms "first", "second", "third", etc. in the specification are only used to distinguish between the various components, elements, steps, etc. in the specification, rather than to represent the logical relationship or sequential relationship between the various components, elements, steps, etc. Moreover, the terms "comprise", "include", or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article, or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article, or device including the element.

[0029] Please refer to Figure 1-Figure 6 , this embodiment provides a cutting device on a sewing machine, comprising:

[0030] The switching mechanism includes a first driving assembly 100 and a pin shaft 200. The pin shaft 200 has a locking position and a movable position. The first driving assembly 100 is used to drive the pin shaft 200 to switch between the locking position and the movable position.

[0031] The cutting mechanism 300 is connected with the pin 200;

[0032] The driving mechanism includes a second driving assembly 400 and a transmission assembly 500. The transmission assembly 500 is connected to the pin shaft 200. The second driving assembly 400 is used to drive the pin shaft 200 in the active position to move through the transmission assembly 500, thereby driving the cutter mechanism 300 to move.

[0033] By setting a switching mechanism to drive the pin shaft 200 to switch between the locked position and the active position, the cutter can be switched to the working state in real time as needed during the sewing process to cut the scraps without stopping sewing, thereby effectively ensuring the sewing efficiency.

[0034] Specifically, the first drive assembly 100 includes a first drive component 101, a connecting rod transmission unit 102 and a switching crank unit. The two ends of the connecting rod transmission unit 102 are rotationally connected to the first drive component 101 and the first end of the switching crank unit respectively, and the second end of the switching crank unit is rotationally connected to the pin shaft 200. The first drive component 101 is used to drive the transmission connecting rod to move and drive the switching crank unit to move, thereby driving the pin shaft 200 to switch between a locked position and an active position.

[0035] In this embodiment, the first driving component 101 is a wrench, the first end of the wrench is the operating end, and the second end of the wrench is rotatably connected to the connecting rod transmission unit 102 and the casing of the sewing machine. By rotating the first end of the wrench, the second end of the wrench and the first end of the connecting rod transmission unit 102 can be driven to rotate relative to the casing.

[0036] Furthermore, the switching crank unit includes a first switching crank 103 and a second switching crank 104 , both ends of the first switching crank 103 are rotationally connected to the connecting rod transmission unit 102 and the first end of the second switching crank 104 , respectively, and the second end of the second switching crank 104 is rotationally connected to the pin shaft 200 .

[0037] In this embodiment, the connecting rod transmission unit 102 includes a first connecting rod and a second connecting rod. The first end of the first connecting rod is rotatably connected to the second end of the wrench and the casing of the sewing machine, the second end of the first connecting rod is rotatably connected to the first end of the second connecting rod, the second end of the second connecting rod is connected to the first end of the first switching crank 103, the second end of the first switching crank 103 is rotatably connected to the first end of the second switching crank 104, and the second end of the second switching crank 104 is rotatably connected to the pin shaft 200.

[0038] Therefore, the transmission process of the entire switching component is as follows:

[0039] Turn the wrench - the first connecting rod moves - the second connecting rod moves - the first switching crank 103 moves - the second switching crank 104 moves - the position of the pin 200 changes, thereby achieving the switching of the pin 200 between the locked position and the active position.

[0040] Please continue to refer to Figure 1-Figure 2 The second drive assembly 400 includes a second drive component and a main shaft 401. Both ends of the main shaft 401 are connected to the second drive component and the transmission assembly 500 respectively. The second drive component is used to drive the main shaft 401 to rotate, thereby driving the transmission assembly 500 to move. In this embodiment, the second drive component includes but is not limited to various motors.

[0041] Furthermore, the transmission assembly 500 includes an eccentric crank 501, a transmission crank 502 and a transmission shaft 503. The first end of the eccentric crank 501 is installed on the main shaft 401, the second end of the eccentric crank 501 is rotationally connected to the transmission shaft 503, the first end of the transmission crank 502 is rotationally connected to the transmission shaft 503, and the second end of the transmission crank 502 is fixedly connected to the pin 200. The rotation of the main shaft 401 can drive the eccentric crank 501 to rotate, and the rotation of the eccentric crank 501 drives the transmission crank 502 to reciprocate through the transmission shaft 503, thereby driving the pin 200 to reciprocate.

[0042] The transmission process of the drive mechanism is as follows:

[0043] The second driving component drives the main shaft 401 to rotate - the eccentric crank 501 to rotate - the transmission shaft 503 to reciprocate - the transmission crank 502 to reciprocate - the pin shaft 200 to reciprocate - the cutter mechanism 300 to reciprocate.

[0044] In this embodiment, combined with Figure 3-Figure 4 , when the pin 200 is in the active position, the projection of the transmission shaft 503 and the pin 200 in the vertical direction at least partially overlap; when the pin 200 is in the locked position, the projection of the transmission shaft 503 and the pin 200 in the vertical direction do not overlap. It should be understood that when the pin 200 is in the locked position, when the second driving component drives the main shaft 401 to rotate, the eccentric crank 501, the transmission shaft 503 and the transmission crank 502 can all operate normally, but due to the positional relationship between the pin 200 and the transmission shaft 503, the transmission crank 502 is at a locking angle in the vertical direction, and this locking angle hinders the movement of the pin 200, thereby preventing the entire movement from continuing to be transmitted downward to the cutter mechanism 300, thereby achieving the locking of the cutter mechanism 300.

[0045] Preferably, the transmission assembly 500 further includes a limit crank 504, a first end of which is rotatably connected to the housing of the sewing machine, and a second end of which is rotatably connected to the transmission shaft 503. The limit crank 504 is mainly used to limit the swing of the transmission shaft 503, thereby limiting the lifting height of the subsequent cutting mechanism 300.

[0046] Preferably, the first end of the limit crank 504 , the second end of the wrench, and the first end of the first connecting rod can be rotatably connected to the same position of the sewing machine housing through the same pin 200 .

[0047] In this embodiment, the cutter mechanism 300 includes a cutter rod 301, a cutter 302 and a cutter crank 303 arranged vertically, the two ends of the cutter crank 303 are rotatably connected to the pin 200 and the first end of the cutter rod 301 respectively, and the second end of the cutter rod 301 is fixedly connected to the cutter 302. When the pin 200 reciprocates, it can drive the cutter rod 301 to move through the cutter crank 303, thereby driving the cutter 302 to move.

[0048] The upper cutter device of the sewing machine further comprises a guide mechanism, which is connected to the top end of the cutter rod 301 and is used to guide the vertical reciprocating motion of the cutter rod 301;

[0049] Preferably, the guide mechanism includes a guide groove 601 and a connecting member 602, one end of the connecting member 602 is connected to the top of the cutting rod 301, and the other end is slidably arranged in the guide groove 601. By setting the guide mechanism, the cutting knife 302 can reciprocate in the vertical direction to facilitate cutting of the cloth.

[0050] In summary, the embodiment of the utility model provides a cutting device on a sewing machine, which drives the pin shaft 200 to switch between a locked position and an active position by setting a switching mechanism. The cutter can be switched to a working state in real time as needed during the sewing process to cut scraps without stopping sewing, thereby effectively ensuring sewing efficiency.

[0051] In addition, it should be recognized that although the present invention has been disclosed as a preferred embodiment, the above embodiment is not intended to limit the present invention. For any technician familiar with the art, without departing from the scope of the technical solution of the present invention, the above disclosed technical content can be used to make many possible changes and modifications to the technical solution of the present invention, or modified into equivalent embodiments of equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of protection of the technical solution of the present invention.

Claims

1. A cutting device on a sewing machine, characterized in that: include: The switching mechanism comprises a first driving assembly and a pin shaft, wherein the pin shaft has a locking position and a movable position, and the first driving assembly is used to drive the pin shaft to switch between the locking position and the movable position; A cutting mechanism connected to the pin shaft; The driving mechanism includes a second driving component and a transmission component, wherein the transmission component is connected to the pin shaft, and the second driving component is used to drive the pin shaft in the active position to move through the transmission component, thereby driving the cutter mechanism to move.

2. The upper cutter device of a sewing machine according to claim 1, characterized in that: The first driving assembly includes a first driving component, a connecting rod transmission unit and a switching crank unit. The two ends of the connecting rod transmission unit are respectively rotatably connected to the first driving component and the first end of the switching crank unit, and the second end of the switching crank unit is rotatably connected to the pin shaft. The first driving component is used to drive the connecting rod transmission unit to move and drive the switching crank unit to move, thereby driving the pin shaft to switch between the locking position and the active position.

3. The upper cutter device of a sewing machine according to claim 2, characterized in that: The first driving component is a wrench, the first end of the wrench is an operating end, and the second end of the wrench is rotatably connected to the connecting rod transmission unit and the casing of the sewing machine.

4. The upper cutter device of a sewing machine according to claim 2, characterized in that: The switching crank unit includes a first switching crank and a second switching crank, wherein two ends of the first switching crank are rotationally connected to the connecting rod transmission unit and the first end of the second switching crank respectively, and the second end of the second switching crank is rotationally connected to the pin shaft.

5. The upper cutter device of a sewing machine according to claim 1, characterized in that: The cutter mechanism comprises a cutter rod, a cutter and a cutter crank arranged vertically, the two ends of the cutter crank are rotatably connected to the pin shaft and the first end of the cutter rod respectively, and the second end of the cutter rod is fixedly connected to the cutter.

6. The upper cutter device of a sewing machine according to claim 5, characterized in that: The upper cutter device of the sewing machine further comprises a guide mechanism, which is connected to the top end of the cutter rod and is used to guide the vertical reciprocating motion of the cutter rod; The guide mechanism comprises a guide groove and a connecting piece, one end of the connecting piece is connected to the top end of the cutter rod, and the other end is slidably arranged in the guide groove.

7. The upper cutter device of a sewing machine according to claim 1, characterized in that: The second driving assembly includes a second driving component and a main shaft. Both ends of the main shaft are connected to the second driving component and the transmission assembly respectively. The second driving component is used to drive the main shaft to rotate, thereby driving the transmission assembly to move.

8. The upper cutter device of a sewing machine according to claim 7, characterized in that: The transmission assembly includes an eccentric crank, a transmission crank and a transmission shaft. The first end of the eccentric crank is installed on the main shaft, the second end of the eccentric crank is rotatably connected to the transmission shaft, the first end of the transmission crank is rotatably connected to the transmission shaft, and the second end of the transmission crank is fixedly connected to the pin shaft. The rotation of the main shaft can drive the eccentric crank to rotate, and the rotation of the eccentric crank drives the transmission crank to reciprocate through the transmission shaft, thereby driving the pin shaft to reciprocate.

9. The upper cutter device of a sewing machine according to claim 8, characterized in that: When the pin is in the active position, the vertical projections of the transmission shaft and the pin at least partially overlap; when the pin is in the locked position, the vertical projections of the transmission shaft and the pin do not overlap.

10. The upper cutter device of a sewing machine according to claim 8, characterized in that: The transmission assembly also includes a limit crank, a first end of the limit crank is rotatably connected to a housing of the sewing machine, and a second end of the limit crank is rotatably connected to the transmission shaft.

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