CN211005905U

CN211005905U - Thread cutting device of sewing machine

Info

Publication number: CN211005905U
Application number: CN201921709978.XU
Authority: CN
Inventors: 郭永军
Original assignee: Wenzhou Shibang Sew Equipment Co ltd
Current assignee: Zhejiang Shibang Intelligent Manufacturing Co.,Ltd.
Priority date: 2019-10-12
Filing date: 2019-10-12
Publication date: 2020-07-14
Anticipated expiration: 2029-10-12

Abstract

The utility model relates to a thread trimming device of sewing machine. The main thread trimming device who solves current sewing machine has the action poor stability, and the low and long problem is remained to the end of a thread of rationality. The wire cutting mechanism comprises a reciprocating driver, a connecting rod and a wire cutting movable knife, the wire cutting movable knife is of a bent arc-shaped structure, the wire cutting movable knife comprises a body portion, a positioning portion, a linkage portion and a knife portion, the wire cutting movable knife is hinged to the knife holder through the positioning portion, the linkage portion is connected with the connecting rod, the connecting rod is connected with the reciprocating driver, and the reciprocating driver drives the connecting rod to linearly reciprocate and drives the wire cutting movable knife to rotate around the central point of the positioning portion through the linkage portion. The device adopts along articulated central point rotation mode, realizes round central point circumference cycloid motion, realizes the purpose of trimming, and action stability is strong, and the structure is reasonable more reliable, and has trimming end of a thread short, can self-adaptation cut multiple sewing thread, and flexibility is high to and advantages such as performance is good.

Description

Thread cutting device of sewing machine

Technical Field

The utility model relates to a sewing machine especially indicates a thread trimming device of sewing machine.

Background

The sewing machine can sew fabrics such as cotton, hemp, silk, wool, artificial fiber and the like and products such as leather, plastic, paper and the like, and the sewed stitches are neat, beautiful, flat and firm, the sewing speed is high, and the use is simple and convenient. When the sewing machine is used, when a sewing product is finished, yarns connected with the sewing product need to be cut off, at present, the thread cutting mode comprises a manual mode and the thread is cut in a manual mode, so that the thread cutting efficiency is low, the stability is poor, the controllability is poor, especially the length is not easy to control, the lengths are different, if the remained thread end is too long, waste is caused, and if the remained thread end is too short, the remained thread end can be separated from the remained thread end, so that the use is influenced; although some sewing machines are equipped with an automatic thread cutting function, the thread cutting mechanism is limited in structure, so that the structure is complex, the thread cutting length is long, the flexibility is poor, and the stability is low, so that the usability is reduced.

SUMMERY OF THE UTILITY MODEL

In order to overcome the shortcoming and the weak point of background art, the utility model provides a thread trimming device of sewing machine solves the thread trimming device of current sewing machine and has the motion poor stability, and the low and thread trimming thread end of structure remains long technical problem.

The technical scheme of the utility model is that: a thread trimming device of a sewing machine comprises a bracket, a thread trimming mechanism and a thread seat, wherein the thread trimming mechanism comprises a reciprocating driver, a connecting rod and a thread trimming movable cutter, the movable trimming knife is of a bent arc structure, a fixed knife matched with the movable trimming knife is arranged below the wire base, the thread cutting moving knife comprises a body part, a positioning part, a linkage part and a knife part, wherein the positioning part and the knife part are respectively positioned at two end parts of the thread cutting moving knife, the linkage part is positioned on the body part and between the positioning part and the linkage part, a tool apron is arranged in the support, the thread cutting movable knife is hinged on the knife holder through the positioning part, the linkage part is connected with the connecting rod, the connecting rod is connected with the reciprocating driver, the reciprocating driver acts to drive the connecting rod to do linear reciprocating motion and drives the thread cutting movable knife to rotate around the central point of the positioning part through the linkage part, the thread cutting movable knife rotates to drive the knife part to do reciprocating curvilinear motion along the lower part of the thread seat and is attached to the fixed knife to realize cutting.

Further, the reciprocating driver is connected with the connecting rod through a guide mechanism, the guide mechanism comprises a linear guide rail and a sliding frame, the sliding frame is matched with the linear guide rail in a sliding mode, the reciprocating driver drives the sliding frame to move linearly, one end of the connecting rod is hinged to the sliding frame, and the other end of the connecting rod is hinged to a linkage portion of the trimming movable knife.

Further, be equipped with the location uide bushing on the support, the frame that slides includes mutually vertically horizontal pole portion and straight pole portion, horizontal pole portion cover is located and is constituted the cooperation of sliding on the linear guide, straight pole portion passes the location uide bushing constitutes the direction cooperation.

Furthermore, the limiting mechanism comprises a rotating shaft, a first limiting cam and a second limiting cam, wherein the first limiting cam and the second limiting cam are arranged on the rotating shaft, and the rotating shaft rotates to drive the first limiting cam or the second limiting cam to form limiting fit with the sliding frame.

The utility model discloses following beneficial effect has: the device adopts along articulated central point rotation mode, realizes round central point circumference cycloid motion, realizes the purpose of trimming, and action stability is strong, and the structure is reasonable more reliable, and has trimming end of a thread short, can self-adaptation cut multiple sewing thread, and flexibility is high to and advantages such as performance is good.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3 is a schematic diagram of the internal structure of the present invention.

Fig. 4 is an enlarged view of the structure at a in fig. 3 according to the present invention.

In the figure, a bracket 1, a wire seat 2, a reciprocating driver 3, a connecting rod 4, a trimming moving blade 5, a body part 51, a positioning part 52, a linkage part 53, a blade part 54, a fixed blade 6, a blade seat 7, a linear guide rail 8, a sliding frame 9, a cross rod part 91, a straight rod part 92, a positioning guide sleeve 10, a rotating shaft 11, a first limit cam 12 and a second limit cam 13.

Detailed Description

Embodiments of the invention are further described below with reference to the accompanying drawings:

as shown in the figure, the thread trimming device of the sewing machine comprises a support 1, a thread trimming mechanism and a thread base 2, wherein the thread trimming mechanism comprises a reciprocating driver 3, a connecting rod 4 and a thread trimming movable knife 5, the thread trimming movable knife 5 is of a bent arc-shaped structure, a fixed knife 6 matched with the thread trimming movable knife 5 is arranged below the thread base 2, the thread trimming movable knife 5 comprises a body part 51, a positioning part 52, a linkage part 53 and a knife part 54, the positioning part 52 and the knife part 54 are respectively positioned at two end parts of the thread trimming movable knife 5, the linkage part 53 is positioned on the body part 51 and positioned between the positioning part 52 and the linkage part 53, a knife base 7 is arranged in the support 1, the thread trimming movable knife 5 is hinged on the knife base 7 through the positioning part 52, the linkage part 53 is connected with the connecting rod 4, the connecting rod 4 is connected with the reciprocating driver 3, the reciprocating driver 3 drives the connecting rod 4 to do linear reciprocating motion, and the linear reciprocating motion drives the thread trimming movable knife 5 to The movable trimming knife 5 rotates to drive the knife part 54 to reciprocate along the lower part of the wire seat 2 and is attached to the fixed knife 6 to realize trimming. The movable trimming cutter is positioned between the fixed cutter and the thread seat, when in use, the reciprocating driver acts to drive the connecting rod to push the movable trimming cutter to rotate around the hinge center, as shown in fig. 4, when cutting the thread, the driver first pushes the movable thread-cutting blade to rotate towards the thread hole of the thread seat through the connecting rod, hooks the thread in the thread hole and then continues to rotate, after reaching the highest point, the thread cutting movable knife is pulled back by the driver so that the knife part is matched with the fixed knife to cut the thread until the thread cutting movable knife returns to the initial position, specifically, the driver adopts an electromagnet to push the movable knife to the stroke end, then the cam and the main shaft synchronously return to hook the bottom thread and the upper thread to the fixed knife to realize the action of cutting the sewing thread, in addition, the movable thread cutting knife adopts an arc-shaped tension structure and has certain elasticity, namely when the sewing thread is thick, the movable thread cutting knife has the function of adaptively adjusting the cutting gap. According to the above scheme, this sewing machine's thread trimming device adopts along articulated central point rotation mode, realizes round central point circumference cycloid motion, realizes the purpose of trimming, and action stability is strong, and the structure is reasonable more reliable, and has trimming end of a thread short, can self-adaptation cut multiple sewing thread, and the flexibility is high to and advantages such as performance is good.

The utility model discloses in, as shown in the figure, be connected through guiding mechanism between reciprocating drive ware 3 and the connecting rod 4, guiding mechanism includes linear guide 8, the frame 9 that slides, the cooperation of sliding of frame 9 and linear guide 8, reciprocating drive ware 3 drives the frame 9 linear motion slides, the one end of connecting rod 4 is articulated mutually with the frame 9 that slides, the other end with it is articulated mutually to cut the line linkage portion 53 that moves sword 5. Through above-mentioned guiding mechanism for reciprocating drive ware moves and drives the connecting rod and move the sword with the trimming through the frame that slides along linear guide and cooperatees, strengthens action stability, improves the guidance quality, thereby its performance is effectively.

The utility model discloses in, as shown in the figure, be equipped with location uide bushing 10 on the support 1, the frame 9 that slides includes looks vertically horizontal pole portion 91 and straight pole portion 92, horizontal pole portion 91 cover is located and is constituted the cooperation of sliding on linear guide 8, straight pole portion 92 passes location uide bushing 10 constitutes the direction cooperation. The guide sleeve is arranged on the support, the cross rod part 91 and the straight rod part 92 of the sliding frame, which are perpendicular to each other, are formed, the straight line part is matched with the linear guide rail to realize the guiding effect, and the straight line part is linearly guided through the guide sleeve and is matched with the connecting rod, so that the guiding and positioning stability of the connecting rod is effectively improved, and the use performance of the trimming mechanism is enhanced.

The utility model discloses in, as shown in the figure, still include stop gear, stop gear includes pivot 11, first limiting cam 12 and second limiting cam 13 are located on pivot 11, pivot 11 rotates and drives first limiting cam 12 or second limiting cam 13 and slide and put up 9 and constitute spacing cooperation. Adopt stop gear, this stop gear includes first stop cam 12 and second stop cam 13, when reciprocating driver is in the low level, the driver has not been released the drive promptly, through first stop cam is spacing to the frame that slides, when reciprocating driver is in the high level, the frame that slides of driver drive promptly slides and is in the outside to it is spacing to slide the frame through second stop cam, thereby make the frame that slides slide and restrict its motion range on linear guide and through first stop cam and second stop cam, guarantee that the connecting rod drives the scissors and is in effectual reasonable interval when carrying out the tangent line, the action is reliable, reasonable, and stability is strong, and performance is high.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection.

Claims

1. The utility model provides a sewing machine's trimming device, includes support (1), trimming mechanism and line seat (2), its characterized in that: the trimming mechanism comprises a reciprocating driver (3), a connecting rod (4) and a trimming movable knife (5), the trimming movable knife (5) is of a bent arc-shaped structure, a fixed knife (6) matched with the trimming movable knife (5) is arranged below a wire base (2), the trimming movable knife (5) comprises a body part (51), a positioning part (52), a linkage part (53) and a knife part (54), the positioning part (52) and the knife part (54) are respectively positioned at two end parts of the trimming movable knife (5), the linkage part (53) is positioned on the body part (51) and positioned between the positioning part (52) and the linkage part (53), a knife holder (7) is arranged in the support (1), the trimming movable knife (5) is hinged on the knife holder (7) through the positioning part (52), the linkage part (53) is connected with the connecting rod (4), and the connecting rod (4) is connected with the reciprocating driver (3), the reciprocating driver (3) acts to drive the connecting rod (4) to do linear reciprocating motion to drive the trimming moving knife (5) to rotate around the central point of the positioning part (52) through the linkage part (53), and the trimming moving knife (5) rotates to drive the knife part (54) to do reciprocating curvilinear motion along the lower part of the wire base (2) and to be attached to the fixed knife (6) to realize shearing.

2. The thread trimmer according to claim 1, wherein: be connected through guiding mechanism between reciprocal driver (3) and connecting rod (4), guiding mechanism includes linear guide (8), slides frame (9), the cooperation that slides of sliding frame (9) and linear guide (8), reciprocal driver (3) drive sliding frame (9) linear motion, the one end and the sliding frame (9) of connecting rod (4) are articulated mutually, the other end with linkage portion (53) of cutting the line and moving sword (5) are articulated mutually.

3. The thread trimmer according to claim 2, wherein: be equipped with location uide bushing (10) on support (1), sliding frame (9) are including looks vertically horizontal pole portion (91) and straight pole portion (92), constitute the cooperation of sliding on linear guide (8) is located in horizontal pole portion (91) cover, straight pole portion (92) pass location uide bushing (10) constitute the cooperation of leading.

4. The thread trimming device of a sewing machine according to claim 2 or 3, wherein: still include stop gear, stop gear includes pivot (11), first spacing cam (12) and second spacing cam (13), pivot (11) are located in first spacing cam (12) and second spacing cam (13), pivot (11) are rotated and are driven first spacing cam (12) or second spacing cam (13) and slide frame (9) and constitute spacing cooperation.