CN201151807Y

CN201151807Y - Severing thread device for sewing machine

Info

Publication number: CN201151807Y
Application number: CNU2007201298371U
Authority: CN
Inventors: 丁建平
Original assignee: Jiangsu Wanping Sewing Machine Technology Service Co Ltd
Current assignee: Jiangsu Wanping Sewing Machine Technology Service Co Ltd
Priority date: 2007-12-27
Filing date: 2007-12-27
Publication date: 2008-11-19
Anticipated expiration: 2017-12-27

Abstract

The utility model relates to a thread-cutting device of a sewing machine, which comprises a dynamic cutter, a static cutter, a thread-cutting crank seat, a thread-cutting cam and a driving mechanism; wherein, the static cutter is fixed on the block of the sewing machine; the thread-cutting cam is arranged on the block of the sewing machine and can rotate around the owned axis; a thread-cutting crank is rotatably connected with the thread-cutting crank seat; a long link rod is firmly connected with the thread-cutting crank, and the other end of the long link rod is hinged with a dynamic cutter crank, with which the dynamic cutter is coaxially and firmly connected. A guide groove is arranged on the outer circumference and adjacent side of the thread-cutting cam; a roller is fixed on the thread-cutting crank; the dynamic cutter is provided with at least two operation positions; when the dynamic cutter is at the first operation position, the dynamic cutter is engaged with the static cutter, so that a thread between the dynamic cutter and the static cutter can be cut off, and at the same time, the roller is positioned in the guide groove; when the dynamic cutter is at the second operation position, the dynamic cutter is disengaged from the static cutter. Compared with the prior art, the thread-cutting device has a simple structure and can more reliably cut threads.

Description

The thread cutting device of Sewing machines

Technical field

The utility model relates to a kind of thread cutting device of Sewing machines.

Background technology

Along with the development and the development of technology of industrial society, employings a large amount of in the clothing industry replace traditional manual work with machinery operation.In the prior art, the thread cutting device of Sewing machines generally includes moving knife, stationary knife and driving mechanism, but because mechanical structure is too complicated, machine is broken down.

Summary of the invention

The purpose of this utility model provides a kind of thread cutting device of simple in structure, the reliable Sewing machines of tangent line.

The utility model can be implemented by the following technical programs: a kind of thread cutting device of Sewing machines, it comprises moving knife, be fixedly installed on the stationary knife on the Sewing machines body, the tangent line crank base, can be arranged on tangential cam and driving mechanism on the Sewing machines body rotationally around himself axis, be rotatably connected to the tangent line crank on the described tangent line crank base, be fixedly connected with long connecting rod on the described tangent line crank, be hinged with the moving knife crank on the other end of described long connecting rod, described moving knife is coaxial to be fixedly connected on the described moving knife crank, offer gathering sill on the outer circumference surface of described tangential cam and the adjacent side, also be set with roller on the described tangent line crank, described roller is mutually close with the side of described tangential cam, described moving knife has at least two operating positions, when described moving knife is in first operating position, described moving knife is meshed with described stationary knife, and this moment, described roller was positioned at described gathering sill; When described moving knife was in second operating position, described moving knife and described stationary knife were separated.

Described driving mechanism comprises the electromagnet installing rack that is fixedly installed on the Sewing machines body and can pivotally be arranged on driving crank on the Sewing machines body, be set with electromagnet on the described electromagnet installing rack, described electromagnet is provided with the electromagnetism iron, one end of described driving crank is hinged on the described electromagnetism iron, and the other end of described driving crank is hinged on the described tangent line crank.

The coaxial movable knife rack that is fixedly connected with on one end of described moving knife crank, described moving knife is fixedly installed on the end of described movable knife rack.

Compared with the prior art the utility model has following advantage: of the present utility model simple in structure, drive the orbiting motion of roller by driving mechanism along gathering sill, driving moving knife via a series of machine driving on the tangent line crank again is meshed with stationary knife, can finish thread cutting action reliably, and tangent line efficient height.

Description of drawings

Accompanying drawing 1 is structural representation Fig. 1 of the present utility model;

Accompanying drawing 2 is structural representation Fig. 2 of the present utility model;

Wherein: 1, moving knife; 2, stationary knife; 4, movable knife rack 5, moving knife crank; 7, long connecting rod 8, tangent line crank 9, roller; 10, tangential cam 12, driving crank; 13, axle 14, electromagnetism iron; 16, electromagnet installing rack 17, electromagnet 28, tangent line crank base; 29, short connecting rod 30, gathering sill; 31, side; 32, driving mechanism.

The specific embodiment

As shown in Figures 1 and 2, a kind of thread cutting device of Sewing machines, it comprises moving knife 1, be fixedly installed on stationary knife 2 on the Sewing machines body, tangent line crank base 28, can be arranged on tangential cam 10 and driving mechanism 32 on the Sewing machines body rotationally around himself axis, be rotatably connected to tangent line crank 8 on the described tangent line crank base 28, be fixedly connected with long connecting rod 7 on the described tangent line crank 8, be hinged with moving knife crank 5 on the other end of described long connecting rod 7, described moving knife 1 coaxial being fixedly connected on the described moving knife crank 5.Driving mechanism 32 is used for roller 9 is pulled in the gathering sill 30, and along the orbiting motion of gathering sill 30.

Offer gathering sill 30 on the outer circumference surface of described tangential cam 10 and the adjacent side 31, also be set with roller 9 on the described tangent line crank 8, described roller 9 is mutually close with the side 31 of described tangential cam 10.Described moving knife 1 has at least two operating positions, when described moving knife 1 is in first operating position, described moving knife 1 is meshed with described stationary knife 2, thereby cuts off the line between moving knife 1 and the stationary knife 2, and this moment, described roller 9 was positioned at described gathering sill 30; When described moving knife 2 was in second operating position, described moving knife 1 was separated with described stationary knife 2.

Described driving mechanism 32 comprises the electromagnet installing rack 16 that is fixedly installed on the Sewing machines body and can be arranged on driving crank 12 on the Sewing machines body rotatably around axle 13, be set with electromagnet 17 on the described electromagnet installing rack 16, described electromagnet 17 is provided with electromagnetism iron 14, one end of described driving crank 12 is hinged on the described electromagnetism iron 14, and the other end of described driving crank 12 is hinged on the described tangent line crank 8.

The coaxial movable knife rack 4 that is fixedly connected with on one end of described moving knife crank 5, described moving knife 1 is fixedly installed on the end of described movable knife rack 4.

When the electromagnet 17 of driving mechanism 32 is switched on work, electromagnetism iron 14 moves right, driving driving crank 12 rotates around axle 13, the rotation of driving crank 12 drives hinged tangent line crank 8 thereon again and turns right, because tangential cam 10 is fixed with the relative position of body and can only be rotated around the axis of self, when the gathering sill offered on the cam 10 30 during near the roller 9 that is fixed on the tangent line crank 8, roller 9 is pulled in the gathering sill 30 and along the orbiting motion of gathering sill 30, tangent line crank 8 along with roller 9 rotating process in, the long connecting rod 7 that is fixed on the tangent line crank 8 drives 5 rotations of moving knife crank, thereby make the coaxial movable knife rack 4 that is fixedly connected on the moving knife crank 5 also rotate thereupon, therefore moving knife 1 can rotate with respect to stationary knife 2, when moving knife 1 is in first operating position, be moving knife 1 when being meshed, can cut off the line between moving knife 1 and the stationary knife 2 with stationary knife 2.

Compared with prior art, of the present utility model simple in structure, drive the orbiting motion of roller 9 by driving mechanism 32 along gathering sill 30, drive moving knife 1 via a series of machine driving on the tangent line crank 8 again and be meshed with stationary knife 2, can finish thread cutting action more reliably, and tangent line efficient height.

Above-described only is preferred embodiment of the present utility model, and every embodiment that does not break away from the technical solutions of the utility model content is the scope of the utility model protection.

Claims

1, a kind of thread cutting device of Sewing machines, it is characterized in that: it comprises moving knife (1), be fixedly installed on the stationary knife (2) on the Sewing machines body, tangent line crank base (28), can be arranged on tangential cam (10) and driving mechanism (32) on the Sewing machines body rotationally around himself axis, be rotatably connected to tangent line crank (8) on the described tangent line crank base (28), be fixedly connected with long connecting rod (7) on the described tangent line crank (8), be hinged with moving knife crank (5) on the other end of described long connecting rod (7), described moving knife (1) is coaxial to be fixedly connected on the described moving knife crank (5), offer gathering sill (30) on the outer circumference surface of described tangential cam (10) and the adjacent side (31), also be set with roller (9) on the described tangent line crank (8), described roller (9) is mutually close with the side (31) of described tangential cam (10), described moving knife (1) has at least two operating positions, when described moving knife (1) is in first operating position, described moving knife (1) is meshed with described stationary knife (2), and described roller this moment (9) is positioned at described gathering sill (30); When described moving knife (2) was in second operating position, described moving knife (1) was separated with described stationary knife (2).

2, the thread cutting device of Sewing machines according to claim 1, it is characterized in that: described driving mechanism (32) comprises the electromagnet installing rack (16) that is fixedly installed on the Sewing machines body and can be arranged on driving crank (12) on the Sewing machines body rotatably around axle (13), be set with electromagnet (17) on the described electromagnet installing rack (16), described electromagnet (17) is provided with electromagnetism iron (14), one end of described driving crank (12) is hinged on the described electromagnetism iron (14), and the other end of described driving crank (12) is hinged on the described tangent line crank (8).

3, the thread cutting device of Sewing machines according to claim 1 is characterized in that: the coaxial movable knife rack (4) that is fixedly connected with on the end of described moving knife crank (5), described moving knife (1) is fixedly installed on the end of described movable knife rack (4).