Sewing thread cutting device of sewing machine

Abstract

The utility model discloses a sewing thread cutting device of a sewing machine, which comprises a plate body provided with a positioning column and a switching column; the rocker is pivoted on the plate body; the movable plate is provided with a first guide groove, a second guide groove and a third guide groove, the positioning column is connected in the first guide groove in a sliding mode, and one end of the rocker is placed in the third guide groove; the swing arm is rotationally mounted on the rotary connection column, and a limiting plate is fixed to the swing arm; the cutter assembly comprises a fixed blade and a movable blade; the limiting plate is provided with at least one first bearing, the swing arm is provided with at least one second bearing, and the first bearing and the second bearing are both connected in the second guide groove in a sliding mode. Through the arrangement of the first bearing and the second bearing, the abrasion of the inner wall of the second guide groove can be effectively reduced while the movable plate is guided, the service life is long, and the practicability is high. In addition, a guide block is arranged between the movable blade and the fixed blade, in the thread hooking and cutting process, the movable blade slides more smoothly, the position of the movable blade can be prevented from deviating, and the thread cutting effect is good.

Description

Technical Field

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

[0002] The conventional suture cutting device of a sewing machine, as disclosed in the Taiwan Utility Patent Announcement No. 523018, mainly comprises a plate body, a reciprocating mechanism, a swinging mechanism and a cutting knife group; the reciprocating mechanism comprises a rocker pivotally connected to the plate body, a movable plate driven by the rocker and a positioning column, a guide groove is provided on the movable plate, and the positioning column passes through the guide groove and is fixedly connected to the plate body; the swinging mechanism comprises a swing arm pivotally connected to the plate body, a limit plate fixed to the swing arm and longitudinally limiting the movable plate; the cutting knife group comprises a movable knife and a fixed knife, the movable knife is fixedly connected to the end of the movable plate and correspondingly formed above the swing arm, and the fixed knife is fixedly connected to the end of the swing arm and correspondingly formed above the movable knife; in this way, a suture cutting device is assembled.

[0003] In the prior art, for example, Chinese patent CN200820127787.8 discloses a suture cutting device for a sewing machine. In this scheme, the guide of the movable plate is realized by providing a second guide groove on the plate body, and by providing at least one boss on the limit plate and a positioning pin on the swing arm. However, in actual use, since the boss and the positioning pin are both poles, and in the working process, the swing of the swing arm will drive the movable plate to swing and squeeze the boss and the positioning pin. After frequent use, the boss, the positioning pin and the inner wall of the groove of the second guide groove will be severely worn, and the service life will be reduced. In addition, no limiting structure is provided between the movable knife and the fixed knife. In the process of the movable knife moving forward and backward relative to the fixed knife, since the swing arm and the movable plate will swing, the position of the movable knife is easily offset, which will affect the cutting effect of the suture. It is necessary to improve the above structure. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a suture cutting device for a sewing machine.

[0005] The technical solution adopted by the utility model is: a suture cutting device for a sewing machine, comprising:

[0006] A plate body, wherein a positioning column and a transfer column are provided on the plate body;

[0007] A rocker, pivotally connected to the plate body;

[0008] A moving plate, wherein a first guide groove, a second guide groove and a third guide groove are provided on the moving plate, wherein the positioning column is slidably connected in the first guide groove, one end of the rocker is placed in the third guide groove, and the rocker is used to drive the moving plate to move;

[0009] A swing arm is installed on the transfer column, a limit plate is fixed on the swing arm, and the limit plate is located above the second guide groove; a cutter assembly includes a fixed blade and a movable blade, wherein the fixed blade is fixed at the end of the swing arm, the movable blade is fixed at the end of the movable plate, and the fixed blade is located above the movable blade;

[0010] At least one first bearing is disposed on the limit plate, and at least one second bearing is disposed on the swing arm. Both the first bearing and the second bearing are matched and slidably connected in the second guide groove.

[0011] Several optional methods are also provided below, but they are not intended to be additional limitations on the above-mentioned overall solution, but are merely further supplements or preferences. Under the premise that there are no technical or logical contradictions, each optional method can be combined with the above-mentioned overall solution separately, and multiple optional methods can also be combined.

[0012] Preferably, the movable blade has a line-hooking state extending forward and a tangent state retracting backward. In the tangent state, the positioning column is located at the front end of the first guide groove, and the second bearing is located at the front end of the second guide groove. In the line-hooking state, the positioning column is located at the rear end of the first guide groove, and one of the first bearings is located at the rear end of the second guide groove.

[0013] Preferably, the plate body is provided with a first limit block and a second limit block, the second limit block is located in front of the first limit block, in the tangent state, the movable plate abuts against the first limit block, and in the hooking state, the movable plate abuts against the second limit block.

[0014] Preferably, a guide block is fixed above the end of the swing arm, and a guide groove is provided at the upper end of the guide block for the movable blade to pass through, and the fixed blade is fixed above the guide block and covers the guide groove.

[0015] Preferably, the guide block is provided with a plurality of mounting holes, the fixed blade is provided with a strip-shaped opening, the strip-shaped opening and the mounting hole are positioned correspondingly, the fixed blade, the guide block and the swing arm are fixed by a plurality of screws, and the screws pass through the strip-shaped opening and the mounting hole in sequence.

[0016] Preferably, a front hook portion and a rear hook portion are provided at the front end of the movable blade, and the front hook portion is located in front of the rear hook portion.

[0017] Preferably, the suture cutting device further comprises a wire clamping assembly, which is fixed to one end of the swing arm away from the plate body and comprises:

[0018] An upper spring sheet is fixed between the swing arm and the guide block, and the upper spring sheet abuts against the bottom surface of the movable blade;

[0019] A lower spring sheet, one end of which is fixed to the swing arm through a connecting block, and the other end of which abuts against the bottom surface of the upper spring sheet;

[0020] The abutment plate is fixed on the swing arm, and one end of the abutment plate abuts against the bottom surface of the lower elastic sheet.

[0021] Preferably, the suture cutting device further comprises a guide wire sheet, the guide wire sheet is fixed to the front end of the movable plate, and a guide wire hole is provided on the guide wire sheet.

[0022] Preferably, the suture cutting device also includes a pressure spring, which includes a ring and two elastic arms extending outward from both ends of the ring, one of which is fixed to the plate body and the other elastic arm elastically presses against one side of the movable plate.

[0023] More preferably, a downwardly recessed groove is provided at the front position of the plate body, and the lower end of the swing arm abuts against the bottom of the groove.

[0024] Compared with the prior art, the utility model has the following beneficial effects:

[0025] 1. A first bearing is arranged at the lower end of the limit plate, a second bearing is arranged at the upper end of the swing arm, and the first bearing and the second bearing are matched and slidably connected in the second guide groove of the movable plate. When the movable plate is driven by the rocker to move forward and backward, the first bearing and the second bearing slide along the second guide groove. Due to the design of the bending position on the first guide groove, the movable plate rotates and drives the swing arm to swing around the transfer column (in this process, the first bearing and the second bearing are squeezed between the inner wall of the second guide groove). The design of the first bearing and the second bearing can effectively reduce the wear of the inner wall of the second guide groove while guiding the movable plate, and has a long service life.

[0026] 2. By setting a guide block between the movable blade and the fixed blade, during the line hooking and line cutting process of the blade assembly, the movable blade will slide along the guide groove on the guide block, the sliding of the movable blade will be smoother, and its position can be prevented from shifting, and the line cutting effect will be good. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 It is an overall top view of the movable blade in a tangent state in one embodiment of the present application;

[0029] Figure 2 It is an overall top view of the movable blade in an embodiment of the present application in a hooking state;

[0030] Figure 3 This is a structural diagram from an upper side view of the part where the cutter assembly is located, when the movable blade is in a line-hooking state in one embodiment of the present application;

[0031] Figure 4 This is a structural diagram from a lower side view of the part where the cutter assembly is located, when the movable blade is in a line-hooking state in one embodiment of the present application;

[0032] Figure 5 It is a schematic diagram of the structure of a guide block in one embodiment of the present application.

[0033] Markings in the accompanying drawings are: 1-plate body, 11-axis column, 12-positioning column, 13-adapter column, 14-first limit block, 15-second limit block, 16-groove, 2-rocker, 21-sliding part, 22-through hole, 3-movable plate, 31-first guide groove, 32-second guide groove, 33-third guide groove, 4-limiting plate, 41-first bearing, 5-swing arm, 51-second bearing, 6-cutter assembly, 61-fixed blade, 611-strip mouth, 62-movable blade, 621-front hook, 622-rear hook, 7-clamp assembly, 71-upper spring, 72-lower spring, 73-receiver plate, 74-connection block, 8-wire sheet, 81-wire hole, 9-guide block, 91-guide groove, 92-mounting hole, 10-pressure spring.

[0034] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0038] Specific implementation plan: see Figure 1-Figure 5 The utility model is a suture cutting device for a sewing machine, comprising:

[0039] A plate body 1, on which a positioning column 12 and a transfer column 13 are provided;

[0040] A rocker 2 is pivotally connected to the plate 1;

[0041] The moving plate 3 is provided with a first guide groove 31, a second guide groove 32 and a third guide groove 33, wherein the positioning column 12 is slidably connected in the first guide groove 31, one end of the rocker 2 is placed in the third guide groove 33, and the rocker 2 is used to drive the moving plate 3 to move;

[0042] The swing arm 5 is installed on the transfer column 13, and a limit plate 4 is fixed on the swing arm 5, and the limit plate 4 is located above the second guide groove 32;

[0043] The cutter assembly 6 comprises a fixed blade 61 and a movable blade 62, wherein the fixed blade 61 is fixed to the end of the swing arm 5, the movable blade 62 is fixed to the end of the movable plate 3, and the fixed blade 61 is located above the movable blade 62;

[0044] At least one first bearing 41 is disposed on the limiting plate 4 , and at least one second bearing 51 is disposed on the swing arm 5 . Both the first bearing 41 and the second bearing 51 are matched and slidably connected in the second guide groove 32 .

[0045] As a preferred implementation of this embodiment, the movable blade 62 has a hooking state extending forward and a tangent state retracting backward. In the tangent state, the positioning column 12 is located at the front end of the first guide groove 31, and the second bearing 51 is located at the front end of the second guide groove 32. In the hooking state, the positioning column 12 is located at the rear end of the first guide groove 31, and one of the first bearings 41 is located at the rear end of the second guide groove 32 (see Figure 1 In this embodiment, there are two first bearings 41, and the two first bearings 41 are arranged at intervals along the extension direction of the first guide groove 32. The design of the two first bearings 41 can make the translation of the movable plate 3 smoother and more stable).

[0046] Note: See Figure 1 and Figure 2 It can be seen that a bending position is provided at the front end of the first guide groove 31 (this is the prior art, so that the cutter assembly 6 can swing to a certain extent during the thread hooking process, thereby better hooking the suture).

[0047] In addition, in this embodiment, a first limit block 14 and a second limit block 15 are provided on the plate body 1, and the second limit block 15 is located in front of the first limit block 14. In the tangent state, the movable plate 3 abuts against the first limit block 14, and in the hooking state, the movable plate 3 abuts against the second limit block 15.

[0048] Here, the first limit block 14 and the second limit block 15 are provided to limit the forward and backward movement range of the movable plate 3 .

[0049] See also Figure 3 and Figure 4 It can be seen that a guide block 9 is fixed above the end of the swing arm 5 , and a guide groove 91 is provided at the upper end of the guide block 9 for the movable blade 62 to pass through. The fixed blade 61 is fixed above the guide block 9 and covers the guide groove 91 .

[0050] Here, a guide block 9 is provided between the fixed blade 61 and the movable blade 62, and a guide groove 91 is provided on the guide block 9, and the movable blade 62 is matched and slidably connected in the guide groove 91. Since the fixed blade 61 is fixed above the guide block 9, the movable blade 62 can be prevented from being separated from the guide groove 91. In the process of the movable blade 62 being driven by the moving plate 3 to move forward and backward, the design of the guide groove 91 can make the displacement of the movable blade 62 smoother on the one hand, and prevent the position of the movable blade 62 from being offset on the other hand, thereby ensuring the smooth execution of the line hooking action and the line cutting action.

[0051] Then, see Figure 5 It can be seen that in this embodiment, a plurality of mounting holes 92 are provided on the guide block 9, a strip opening 611 is provided on the fixed blade 61, the strip opening 611 and the mounting hole 92 correspond in position, and the fixed blade 61, the guide block 9 and the swing arm 5 are fixed by a plurality of screws, and the screws pass through the strip opening 611 and the mounting hole 92 in sequence.

[0052] Here, the head of the screw is located above the fixed blade 61, and the shaft of the screw passes through the strip opening 611 and the mounting hole 92 in sequence, thereby fixing the fixed blade 61, the guide block 9 and the swing arm 5 as a whole.

[0053] In this embodiment, the front end of the movable blade 62 is provided with a front hook 621 and a rear hook 622, and the front hook 621 is located in front of the rear hook 622. Here, the front hook 621 is used to hook the suture, and the rear hook 622 is used to hook the rear suture.

[0054] See also Figure 4 It can be seen that in this embodiment, the suture cutting device further includes a clamping assembly 7, which is fixed to the end of the swing arm 5 away from the plate body 1 and includes:

[0055] The upper spring piece 71 is fixed between the swing arm 5 and the guide block 9, and the upper spring piece 71 abuts against the bottom surface of the movable blade 62;

[0056] The lower spring piece 72 has one end fixed to the swing arm 5 through the connecting block 74 and the other end abuts against the bottom surface of the upper spring piece 71;

[0057] The abutment plate 73 is fixed on the swing arm 5 , and one end of the abutment plate 73 abuts against the bottom surface of the lower elastic sheet 72 .

[0058] In this embodiment, when the suture is cut by the fixed blade 61 and the movable blade 62, the suture will be clamped between the upper spring plate 71 and the movable blade 62. Since the lower spring plate 72 abuts against the bottom surface of the upper spring plate 71, and the abutment plate 73 abuts against the bottom surface of the lower spring plate 72, the clamping effect of the suture can be enhanced, which facilitates subsequent sewing.

[0059] See also Figure 2 It can be seen that, in this embodiment, the suture cutting device further includes a guide wire sheet 8, which is fixed to the front end of the movable plate 3 and is provided with a thread passing hole 81.

[0060] Next, in this embodiment, the suture cutting device also includes a pressure spring 10, which includes a ring and two elastic arms extending outward from both ends of the ring, one of which is fixed to the plate body 1, and the other elastic arm is elastically pressed against one side of the movable plate 3.

[0061] More specifically, in this embodiment, a groove 16 which is sunken downward is provided at the front of the plate body 1 , and the lower end of the swing arm 5 abuts against the bottom of the groove 16 .

[0062] The following is a brief description of the working method of the suture cutting device (since the overall working principle belongs to the prior art, only a brief description is given): Please refer to Figure 2 It can be seen that the plate body 1 is fixed with a shaft column 11, and the rocker 2 is pivotally connected to the plate body 1 through the shaft column 11. The end of the rocker 2 is provided with a through hole 22, and the rocker 2 is connected to the driving mechanism through the through hole 22, and the driving mechanism can drive the rocker 2 to swing. When the sewing machine sews to a specific section, the driving mechanism works, and the telescopic movement of the driving rod on it will drive the rocker 2 to swing forward. Since the toggle part 21 at the end of the rocker 2 is located in the third guide groove 33, when the rocker 2 swings, the toggle part 21 will push the moving plate 3 to move forward, and the side of the moving plate 3 is resisted by the pressure spring 10, so that it can slide stably on the plate body 1.

[0063] Since the movable blade 62 is fixed to the end of the movable plate 3, the fixed blade 61 is fixed to the end of the swing arm 5, the first bearing 41 on the limit plate 4 and the second bearing 51 on the swing arm 5 are both slidably connected to the second guide groove 32, and the limit plate 4 is fixed to the swing arm 5. Therefore, when the movable plate 3 moves forward, the positioning column 12 is separated from the bending position of the first guide groove 31. During this process, the position of the movable plate 3 will swing, thereby driving the swing arm 5, the cutter assembly 6 and the clamp assembly 7 to swing together. At this time, the swing arm 5 rotates around the adapter column 13, and drives the limit plate 4 to rotate synchronously. Please refer to Figure 2 It can be seen that when the positioning column 12 slides to the rear end of the first guide groove 31 (the movable plate 3 abuts against the second limit block 15), the front hook 621 and the rear hook 622 on the movable blade 62 both extend to the front of the fixed blade 61, thereby completing the hooking of the suture and the rear suture. When the movable plate 3 moves backward, similarly, when the positioning column 12 re-enters the bending position, the position of the movable plate 3 will swing in the opposite direction, thereby driving the swing arm 5, the cutter assembly 6 and the clamp assembly 7 to swing together. At this time, the swing arm 5 rotates in the opposite direction around the adapter column 13, and drives the limit plate 4 to rotate in the opposite direction synchronously. Please refer to Figure 1 It can be seen that at this time, the movable blade 62 is reset and retracted backwards, and cooperates with the fixed blade 61. First, the upper suture will touch the fixed blade 61 and be cut, and then the suture will touch the fixed blade 61 and be cut, and the suture will be clamped between the movable blade 62 and the upper spring plate 71 to complete the action of cutting and clamping the suture, which is also conducive to the next sewing.

[0064] The above description of a suture cutting device for a sewing machine of the utility model is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the inventive concept of the utility model, or direct / indirect application in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A suture cutting device for a sewing machine, comprising: A plate body, wherein a positioning column and a transfer column are provided on the plate body; A rocker, pivotally connected to the plate body; A moving plate, wherein a first guide groove, a second guide groove and a third guide groove are provided on the moving plate, wherein the positioning column is slidably connected in the first guide groove, one end of the rocker is placed in the third guide groove, and the rocker is used to drive the moving plate to move; A swing arm is installed on the transfer column, and a limit plate is fixed on the swing arm, and the limit plate is located above the second guide groove; A cutter assembly, comprising a fixed blade and a movable blade, wherein the fixed blade is fixed to the end of the swing arm, the movable blade is fixed to the end of the movable plate, and the fixed blade is located above the movable blade; It is characterized in that At least one first bearing is disposed on the limit plate, and at least one second bearing is disposed on the swing arm. Both the first bearing and the second bearing are matched and slidably connected in the second guide groove.

2. A suture cutting device for a sewing machine according to claim 1, characterized in that: The movable blade has a line-hooking state extending forward and a tangent state retracting backward. In the tangent state, the positioning column is located at the front end of the first guide groove, and the second bearing is located at the front end of the second guide groove. In the line-hooking state, the positioning column is located at the rear end of the first guide groove, and one of the first bearings is located at the rear end of the second guide groove.

3. A suture cutting device for a sewing machine according to claim 2, characterized in that: The plate body is provided with a first limit block and a second limit block, the second limit block is located in front of the first limit block, in the tangent state, the movable plate abuts against the first limit block, and in the hooking state, the movable plate abuts against the second limit block.

4. A suture cutting device for a sewing machine according to any one of claims 1 to 3, characterized in that: A guide block is fixed above the end of the swing arm, a guide groove is provided at the upper end of the guide block for the movable blade to pass through, and the fixed blade is fixed above the guide block and covers the guide groove.

5. A suture cutting device for a sewing machine according to claim 4, characterized in that: The guide block is provided with a plurality of mounting holes, the fixed blade is provided with a strip opening, the strip opening and the mounting hole are in corresponding positions, the fixed blade, the guide block and the swing arm are fixed by a plurality of screws, and the screws pass through the strip opening and the mounting hole in sequence.

6. The thread cutting device for a sewing machine according to claim 1, characterized in that: The front end of the movable blade is provided with a front hook portion and a rear hook portion, and the front hook portion is located in front of the rear hook portion.

7. The thread cutting device for a sewing machine according to claim 4, characterized in that: The suture cutting device further comprises a clamping assembly, which is fixed to an end of the swing arm away from the plate body and comprises: An upper spring sheet is fixed between the swing arm and the guide block, and the upper spring sheet abuts against the bottom surface of the movable blade; A lower spring sheet, one end of which is fixed to the swing arm through a connecting block, and the other end of which abuts against the bottom surface of the upper spring sheet; The abutment plate is fixed on the swing arm, and one end of the abutment plate abuts against the bottom surface of the lower elastic sheet.

8. The thread cutting device for a sewing machine according to claim 1, characterized in that: The suture cutting device also includes a guide wire sheet, which is fixed to the front end of the movable plate and is provided with a wire passing hole.

9. The thread cutting device for a sewing machine according to claim 1, characterized in that: The suture cutting device also includes a pressure spring, which includes a ring and two elastic arms extending outward from both ends of the ring, one of which is fixed to the plate body and the other elastic arm elastically presses against one side of the movable plate.

10. The thread cutting device for a sewing machine according to claim 1, characterized in that: A groove which is sunken downwards is provided at the front position of the plate body, and the lower end of the swing arm abuts against the bottom of the groove.

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