CN210002063U

CN210002063U - Cutter structure of thread cutting mechanism of sewing machine

Info

Publication number: CN210002063U
Application number: CN201920495386.6U
Authority: CN
Inventors: 罗千
Original assignee: Ningbo Supreme Electronic Machinery Co Ltd
Current assignee: Supreme Intelligent Technology Co Ltd
Priority date: 2019-04-12
Filing date: 2019-04-12
Publication date: 2020-01-31
Anticipated expiration: 2029-04-12

Abstract

The utility model discloses a sewing machine thread trimming mechanism's sword structure, including moving sword and stationary knife, moving the sword body that the sword has an axle mounting hole, the end of sword body has the drive hole that is used for connecting the actuating lever, the other end of sword body has the tool bit, the tool bit has the crochet hook line portion of indent facing the leading edge of stationary knife, the trailing edge has outside convex separated time hook, the side edge of separated time hook has the needle portion of keeping away of indent, the other side edge of separated time hook has the portion of acting as go-between of indent.

Description

Cutter structure of thread cutting mechanism of sewing machine

Technical Field

The utility model belongs to the technical field of the industrial sewing machine and specifically relates to sewing machine thread trimming mechanism's sword structure.

Background

The patent No. 201120297904.7 discloses a kind of trimming and clamping device, which includes a needle plate, the needle plate is fixedly provided with a fixed blade and an elastic clamping line body, the tool bit of the fixed blade is positioned on side of the needle hole position, another side of the needle hole position is provided with a movable blade rotatably arranged on the needle plate, the positions of the needle hole, the tool bit and the elastic clamping line body are coincided with the rotating track of the rotating end of the movable blade, the front part of the rotating end of the movable blade is provided with a wire pushing part matched with the elastic clamping line body, the rear part of the rotating end of the movable blade is provided with a trimming part matched with the tool bit of the fixed blade.

Disclosure of Invention

The utility model aims to solve the technical problem that to above-mentioned prior art current situation, and provide kinds of sewing machine thread trimming mechanism's sword structure.

The utility model provides a technical scheme that sewing machine thread trimming mechanism's sword structure, including moving sword and stationary knife, move the sword body that the sword has the axle mounting hole, the end of sword body has the drive hole that is used for connecting the actuating lever, the other end of sword body has the tool bit, the tool bit has the crochet hook portion of indent facing the leading edge of stationary knife, the trailing edge has outside convex separated time hook, the side edge of separated time hook has the needle portion of keeping away of indent, the other side edge of separated time hook has the portion of acting as go-between of indent.

In order to optimize the technical proposal, the utility model discloses still include following modified technical proposal.

The side wall of the tool bit matched with the fixed cutter is provided with a matching groove extending from the front edge to the rear edge; the width of the front edge of the matching groove is larger than that of the rear edge; the mating groove has a leading edge depth greater than a trailing edge depth.

The root of the wire dividing hook is provided with a hollow hole.

The fixed cutter is fixed on the mounting plate, and the movable cutter is in rotating fit with the rotating shaft on the mounting plate through the shaft mounting hole; the fixed cutter is positioned on the track of the cutter head rotating around the rotating shaft.

The fixed knife is provided with a knife edge matched with the matching groove.

The fixed knife is provided with an arc surface in front of the knife edge for matching with the movable knife to keep the wire clamping state.

Compared with the prior art, the utility model discloses a sewing machine thread trimming mechanism's sword structure only needs the operating condition of accuse brake sword, just can realize the centre gripping of suture and cut off control. Compared with the prior art, the structure of the thread trimming mechanism is greatly simplified, and the thread trimming mechanism is easier to install below a narrow needle plate. Through the drive of corresponding control template, the timely switching between waiting to quick-witted position, double-layered line position and tangent line position of sewing stitch time control brake sword can effectively avoid the suture bird's nest phenomenon when sewing the rise of the needle, improves sewing quality and the pleasing to the eye degree of stitch.

Drawings

Fig. 1 is a schematic perspective view of an embodiment of the present invention.

Fig. 2 is a schematic perspective view of the movable blade of fig. 1.

Fig. 3 is a schematic view of in its operating state.

Fig. 4 is a schematic view of a second operating state.

Fig. 5 is a schematic view of a third operating state.

Fig. 6 is a fourth operating state diagram.

Fig. 7 is a schematic view of a fifth operating state.

Fig. 8 is a sixth operational state diagram.

Detailed Description

Embodiments of the present invention are described in further detail below in with reference to the drawings.

Fig. 1 to 8 are schematic structural views of the present invention.

Wherein the reference numerals are: the movable knife 1, the knife body 11, the shaft mounting hole 12, the driving hole 13, the knife head 14, the hook line part 14a, the line dividing hook 14b, the needle avoiding part 14c, the pull line part 14d, the matching groove 14e, the hollowed hole 15, the fixed knife 2, the knife edge 2a, the driving rod 3, the mounting plate 4, the suture line 5 and the machine needle 6.

As shown in figures 1 and 2, the knife structure of the thread cutting mechanism of the sewing machine comprises a movable knife 1 and a fixed knife 2, wherein the movable knife 1 is provided with a knife body 11 of a shaft mounting hole 12, the end of the knife body 11 is provided with a driving hole 13 for connecting a driving rod 3, the other end of the knife body 11 is provided with a knife head 14, the front edge of the knife head 14 facing the fixed knife 2 is provided with a concave hook thread part 14a, the rear edge of the knife head is provided with an outward convex thread dividing hook 14b, the side edge of the thread dividing hook 14b is provided with a concave needle avoiding part 14c, and the other side edge of the thread dividing hook 14b is provided with a concave pull thread part 14 d.

The side wall of the cutter head 14 to which the stationary blade 2 is fitted has a fitting groove 14e extending from the front edge to the rear edge. The width of the front edge of the fitting groove 14e is larger than that of the rear edge. The depth of the leading edge of the fitting groove 14e is greater than the depth of the trailing edge. When the movable blade 1 rotates to the fixed blade 2, the fixed blade 2 and the matching groove 14e have large front edge width and small rear edge width of the matching groove 14e, and can play a role in guiding the suture 5. The depth of the matching groove 14e is reduced from the front edge to the rear edge, the part with larger depth can play a role of clamping the suture 5 with the fixed knife 2 in the front half section, and the part with smaller depth can match the fixed knife 2 to cut off the thread end in the rear half section.

A hollow hole 15 is formed at the root of the branching hook 14 b. The needle avoiding portion 14c and the thread pulling portion 14d are respectively located on the side surfaces of the thread separating hook 14 b.

The fixed knife 2 is fixed on the mounting plate 4, and the movable knife 1 is in running fit with a rotating shaft on the mounting plate 4 through a shaft mounting hole 12; the fixed cutter 2 is positioned on the track of the rotation of the cutter head 14 around the rotating shaft. The fixed blade 2 has a blade edge 2a that is engaged with the engagement groove 14e, and the blade edge 2a can move along the leading edge to the trailing edge of the engagement groove 14e when the movable blade 1 rotates about the rotary shaft.

In a preferred embodiment, the fixed blade 2 has an arc surface in front of the blade edge 2a for engaging with the movable blade 1 to maintain a thread-clamping state, and when the movable blade 1 rotates to a thread-clamping position, the arc surface and the engaging groove 14e clamp and fix the thread 5. When the movable blade 1 continues to rotate to the suture line cutting position, the blade 2a is engaged with the engagement groove 14e to cut the suture line 5.

The utility model discloses a control method for driving above-mentioned sword structure of claim and carrying out trimming operation, including being used for the drive move sword 1 around its rotation center pivoted motor, the control system who is connected with motor drive module the motor is preferred step motor, also can be servo motor the power output shaft of motor passes through end swing joint of crank and actuating lever 3, the end in addition of actuating lever 3 with move the driving hole 13 swing joint of sword 1, through the turned angle of control motor, alright control move the turned angle of sword 1.

The control system is provided with an th control module for controlling the movable knife 1 to rotate to a standby position, a second control template for controlling the movable knife 1 to rotate to a wire clamping position, and a third control module for controlling the movable knife 1 to rotate to a tangent position.

The motor is provided with a sensor for feeding back the rotation angle of the motor to the control system, and the sensor can calculate the state of the movable knife 1 by detecting the rotation angle of the motor rotor so as to be convenient for control.

As shown in figure 3, the control system executes the th control module before the sewing is started to control the movable knife 1 to rotate to the standby position, the th control module is usually executed when the control system is started, and can also be executed when sections of seam sewing are finished, the movable knife 1 state is detected by a sensor before the sewing is started, and the th control module is also needed to be executed if the movable knife 1 is not in the standby position.

As shown in fig. 4, after 1 to 3 stitches are sewn, the second control module is executed, the movable blade 1 is rotated to the thread clamping position and the sewing thread end is fixed between the movable blade 1 and the fixed blade 2, and the thread clamping state is maintained for 3 to 10 stitches. The control system may execute the second control template after sewing 1 or 2 or 3 stitches. The thread-clamping state is maintained for 3, 4, 5, 6, 7 or to 10 stitches. In the thread clamping state, the structure of the needle avoiding part 14c on the movable knife 1 can avoid the interference of the sewing action of the needle 6.

As shown in fig. 5, after the thread clamping state is finished, the third control module is executed, the movable knife 1 cuts off the clamped thread end to the thread cutting position, and the thread cutting position is reached until the stitch sewing is finished.

As shown in figure 6, when the stitch sewing is finished, the control system executes the control module, and the movable knife 1 uses the thread separating hook 14b to separate the thread 5 at the needle 6 and transfer to the standby position.

As shown in fig. 7, a third control module is then executed to sever the stitches 5 on the stitchbonded material.

As shown in fig. 8, the th control module is executed, the movable knife 1 is turned to the standby position to prepare for sewing the next stitches.

While the preferred embodiments of the present invention have been illustrated, various changes and modifications may be made by those skilled in the art without departing from the scope of the present invention.

Claims

The cutter structure of the thread cutting mechanism of the sewing machine 1 and comprises a movable cutter (1) and a fixed cutter (2), and is characterized in that the movable cutter (1) is provided with a cutter body (11) with a shaft mounting hole (12), the end of the cutter body (11) is provided with a driving hole (13) for connecting a driving rod (3), the other end of the cutter body (11) is provided with a cutter head (14), the front edge of the cutter head (14) facing the fixed cutter (2) is provided with an inwards concave thread hooking part (14a), the rear edge of the cutter head is provided with an outwards convex thread dividing hook (14b), the side edge of the thread dividing hook (14b) is provided with an inwards concave needle avoiding part (14c), and the other side edge of the thread dividing hook (14b) is provided with an inwards concave thread pulling part (14 d).
2. The knife structure of claim 1, wherein: the side wall of the cutter head (14) matched with the fixed cutter (2) is provided with a matching groove (14e) extending from the front edge to the rear edge; the width of the front edge of the matching groove (14e) is larger than that of the rear edge; the depth of the front edge of the fitting groove (14e) is larger than that of the rear edge.
3. The knife structure of claim 1, wherein: the root of the branch hook (14b) is provided with a hollow hole (15).
4. The knife structure of claim 1, wherein: the fixed knife (2) is fixed on the mounting plate (4), and the movable knife (1) is in running fit with a rotating shaft on the mounting plate (4) through a shaft mounting hole (12); the fixed cutter (2) is positioned on the track of the cutter head (14) rotating around the rotating shaft.
5. The knife structure of claim 4, wherein: the fixed knife (2) is provided with a knife edge (2a) matched with the matching groove (14 e).
6. The knife structure of claim 5, wherein: the fixed knife (2) is provided with an arc surface in front of the cutting edge (2a) for cooperating with the movable knife (1) to keep a wire clamping state.