阅读说明：本技术 一种缝纫机的下机头 (Lower machine head of sewing machine ) 是由 毕兴国 赵世良 高腊松 于 2021-01-01 设计创作，主要内容包括：本发明属于缝制设备技术领域,涉及一种缝纫机的下机头,其解决了现有缝纫机的下机头在旋转复位时检测灵敏度低等问题。本下机头包括电机座、传动轮和旋梭座,传动轮转动设置于电机座上,旋梭座固定于传动轮上,传动轮或旋梭座上设置有磁铁,电机座上设置有与磁铁相对应的磁性开关,磁性开关连接有电控系统。缝纫机运行时,可通过电机带动传动轮旋转,从而带动旋梭座同步转动,使其与线迹的走向相配合。而当需要复位时,传动轮旋转,当磁铁转动至接近电机座上的磁性开关位置时,磁性开关可将检测信号反馈至电控系统,电控系统可将该位置定义为原点位置。与现有技术相比,本发明采用磁感方式进行检测,安装方便,检测灵敏度高。(The invention belongs to the technical field of sewing equipment, relates to a lower machine head of a sewing machine, and solves the problems that the lower machine head of the existing sewing machine is low in detection sensitivity during rotary reset and the like. The lower machine head comprises a motor base, a driving wheel and a rotating shuttle seat, wherein the driving wheel is rotatably arranged on the motor base, the rotating shuttle seat is fixed on the driving wheel, a magnet is arranged on the driving wheel or the rotating shuttle seat, a magnetic switch corresponding to the magnet is arranged on the motor base, and the magnetic switch is connected with an electric control system. When the sewing machine is in operation, the driving wheel can be driven to rotate by the motor, so that the rotating shuttle seat is driven to synchronously rotate, and the rotating shuttle seat is matched with the trend of stitches. When the motor base needs to be reset, the driving wheel rotates, when the magnet rotates to a position close to the magnetic switch on the motor base, the magnetic switch can feed back a detection signal to the electric control system, and the electric control system can define the position as an original position. Compared with the prior art, the invention adopts a magnetic induction mode for detection, is convenient to install and has high detection sensitivity.)

1. The lower machine head of the sewing machine comprises a motor base (12), a transmission wheel (14) and a rotating shuttle base (1), wherein the transmission wheel (14) is rotatably arranged on the motor base (12), and the rotating shuttle base (1) is fixed on the transmission wheel (14), and is characterized in that a magnet (2) is arranged on the transmission wheel (14) or the rotating shuttle base (1), a magnetic switch (3) corresponding to the magnet (2) is arranged on the motor base (12), and the magnetic switch (3) is connected with an electric control system.

2. The lower head of the sewing machine according to claim 1, characterized in that the lower surface of the rotating shuttle seat (1) is provided with a long groove (4), a magnet frame (5) which can move along the length direction of the long groove (4) is arranged in the long groove (4), and the magnet (2) is fixed on the magnet frame (5). The magnet frame (5) can move along the length direction of the long groove (4), so that the position of the magnet (2) can be adjusted, and the detection position can be adjusted conveniently.

3. The lower head of the sewing machine according to claim 2, characterized in that the opening of the elongated slot (4) on the lower surface of the rotating shuttle seat (1) faces the upper surface of the driving wheel (14), a through hole (6) which is perpendicular to and communicated with the elongated slot (4) is formed in the rotating shuttle seat (1), a fastening piece (7) is inserted in the through hole (6), and the fastening piece (7) tightly presses the magnet frame (5) in the elongated slot (4) against the upper surface of the driving wheel (14).

4. Lower head for a sewing machine according to claim 3, characterized in that said magnet (2) is fixed to the outer end of said magnet holder (5) and is located outside said elongated slot (4).

5. Lower head of a sewing machine according to claim 1 or 2 or 3 or 4, characterized in that said magnetic switch (3) is movably arranged on the upper surface of said motor seat (12).

6. The lower head of the sewing machine according to claim 5, characterized in that the upper surface of the motor base (12) is provided with a switch base (8), the switch base (8) is provided with a mounting groove (9), and the magnetic switch (3) is movably arranged in the mounting groove (9).

7. Lower head of a sewing machine according to claim 6, characterized in that the section of the magnetic switch (3) is the same as the section of the mounting groove (9).

8. Lower head of a sewing machine according to claim 5, characterized in that the lower surface of the magnet (2) is close to the upper surface of the magnetic switch (3).

9. The lower head of the sewing machine according to claim 1, wherein the motor base (12) is provided with an inner hole (13), an upper bearing (10) and a lower bearing (11) are arranged at the upper end and the lower end of the inner hole (13), and the driving wheel (14) is connected with the upper bearing (10) and the lower bearing (11).

Technical Field

The invention belongs to the technical field of sewing equipment, and relates to a lower machine head of a sewing machine.

Background

The needle bar of the traditional sewing machine only moves up and down, and the rotating shuttle on the machine base is only fixed at the installation position and rotates. With the increasing of various demands and the development of the research and development technology of sewing equipment, a sewing machine with head rotation or needle bar rotation is also in motion, and the needle bar of the sewing machine can do 360-degree rotation motion in addition to up-and-down motion. When the needle bar moves, the rotating shuttle and the needle bar synchronously rotate, namely the rotating shuttle rotates along with the rotating shuttle shaft and simultaneously rotates 360 degrees along with the rotating shuttle seat.

For example, the lower head of the independently driven rotary automatic sewing machine disclosed in the chinese patent CN103981648A is installed right below the upper head, the lower head includes a bottom thread rotating system and a bottom shuttle system which are independently driven, the bottom shuttle system is arranged on the upper part of the bottom thread rotating system; the bottom line rotating system comprises a conductive slip ring, a bottom line motor, a gearbox and a rotating shaft, wherein the conductive slip ring is arranged below the gearbox through a slip ring fixing seat, and the bottom line motor is fixed on the side part of the gearbox through a motor receiving disc; the conductive slip ring comprises a slip ring body and a fixed support, a rotating shaft penetrates through the gearbox and is connected with the slip ring body of the conductive slip ring, and the rotating shaft can drive the slip ring body to rotate in the fixed support; the upper end of the rotating shaft is provided with a flange plate, the bottom shuttle system is fixed on the flange plate, the bottom line motor drives the rotating shaft to rotate through the gearbox, and the rotating shaft drives the bottom shuttle system to rotate 360 degrees in any direction.

However, both the machine head and the rotating shuttle rotating mechanism need to have a position as an origin position when resetting, in the prior art, a proximity switch is usually adopted as electronic equipment for identifying the origin position, but the proximity switch is inconvenient to mount and has low detection sensitivity.

Disclosure of Invention

The invention aims to solve the problems in the prior art, and provides a lower machine head of a sewing machine, which aims to solve the technical problems that: how to improve the detection sensitivity of the sewing machine when the sewing machine is rotated and reset.

The purpose of the invention can be realized by the following technical scheme:

the lower machine head of the sewing machine comprises a motor base, a driving wheel and a rotating shuttle seat, wherein the driving wheel is rotatably arranged on the motor base, and the rotating shuttle seat is fixed on the driving wheel.

The working principle is as follows: when the sewing machine is in operation, the driving wheel can be driven to rotate by the motor, so that the rotating shuttle seat is driven to synchronously rotate, and the rotating shuttle seat is matched with the trend of stitches. When the motor base needs to be reset, the driving wheel rotates, when the magnet rotates to a position close to the magnetic switch on the motor base, the magnetic switch can feed back a detection signal to the electric control system, and the electric control system can define the position as an original position. Compared with the prior art, the invention adopts a magnetic induction mode for detection, is convenient to install and has high detection sensitivity.

In the lower head of the sewing machine, the lower surface of the rotating shuttle seat is provided with a long groove, a magnet frame capable of moving along the length direction of the long groove is arranged in the long groove, and the magnet is fixed on the magnet frame. The magnet frame can move along the length direction of the long groove, so that the position of the magnet can be adjusted, and the detection position can be conveniently adjusted.

In the lower machine head of the sewing machine, an opening of a long groove on the lower surface of the rotating shuttle seat faces the upper surface of the driving wheel, a through hole perpendicular to and communicated with the long groove is formed in the rotating shuttle seat, a first fastening piece is inserted in the through hole, and the first fastening piece enables a magnet frame in the long groove to be tightly abutted to the upper surface of the driving wheel. The magnet frame is matched with the upper surface of the driving wheel through the first fastening piece to realize installation, when the detection position needs to be adjusted, the first fastening piece can be unscrewed or taken out, the magnet frame is moved along the long groove, the magnet is moved to the preset position, and then the first fastening piece is inserted into the through hole again, so that the magnet frame is abutted against the upper surface of the driving wheel.

In the lower head of the sewing machine, the magnet is fixed at the outer end of the magnet frame and is positioned outside the long groove. The magnet is designed outside the long groove, so that the detection sensitivity can be improved.

In the above lower head of a sewing machine, the magnetic switch is movably disposed on the upper surface of the motor base. The magnetic switch can move, and the detection position can be adjusted.

In the lower head of the sewing machine, the upper surface of the motor base is provided with the switch base, the switch base is provided with the mounting groove, and the magnetic switch is movably arranged in the mounting groove.

In the lower head of the sewing machine, the cross section of the magnetic switch is the same as that of the mounting groove. The sections of the magnetic switch and the magnetic switch are the same, so that the magnetic switch can be moved, and the installation stability is ensured.

In the lower head of the sewing machine described above, a lower surface of the magnet is close to an upper surface of the magnetic switch. The design can further improve the detection sensitivity.

In the lower head of the sewing machine, the motor base is provided with an inner hole, the upper end and the lower end of the inner hole are provided with an upper bearing and a lower bearing, and the driving wheel is connected with the upper bearing and the lower bearing.

Compared with the prior art, the invention has the following advantages:

1. the invention adopts a magnetic induction mode for detection, is convenient to install and has high detection sensitivity;

2. the magnet frame can move along the length direction of the long groove, so that the position of the magnet can be adjusted, and the detection position can be conveniently adjusted;

3. the magnetic switch can move, and the detection position can be adjusted.

Drawings

Fig. 1 is a schematic structural view of the present lower head.

Fig. 2 is an exploded view of the present lower head.

Fig. 3 is a bottom view of the present lower head.

Fig. 4 is a schematic structural view of the present magnetic switch.

In the figure, 1, a rotating shuttle seat; 2. a magnet; 3. a magnetic switch; 4. a long groove; 5. a magnet frame; 6. a through hole; 7. a fastener; 8. a switch base; 9. mounting grooves; 10. an upper bearing; 11. a lower bearing; 12. a motor base; 13. an inner bore; 14. a driving wheel.

Detailed Description

The following are specific embodiments of the present invention and are further described with reference to the drawings, but the present invention is not limited to these embodiments.

As shown in fig. 1, 2 and 3, the lower head of the sewing machine comprises a motor base 12, a driving wheel 14 and a rotating shuttle base 1, wherein the driving wheel 14 is rotatably arranged on the motor base 12, and the rotating shuttle base 1 is fixed on the driving wheel 14.

Specifically, an inner hole 13 is formed in the motor base 12, an upper bearing 10 and a lower bearing 11 are arranged at the upper end and the lower end of the inner hole 13, and the driving wheel 14 is connected with the upper bearing 10 and the lower bearing 11.

As shown in fig. 1, 2 and 3, a magnet 2 is arranged on the driving wheel 14 or the rotating shuttle seat 1, a magnetic switch 3 corresponding to the magnet 2 is arranged on the motor seat 12, and the magnetic switch 3 is connected with an electric control system.

In this embodiment, the lower surface of the rotating shuttle seat 1 is provided with a long groove 4, a magnet frame 5 which can move along the length direction of the long groove 4 is arranged in the long groove 4, and the magnet 2 is fixed on the magnet frame 5.

Preferably, the opening of the elongated slot 4 on the lower surface of the rotating shuttle seat 1 faces the upper surface of the driving wheel 14, the rotating shuttle seat 1 is provided with a through hole 6 which is perpendicular to and communicated with the elongated slot 4, a fastening piece 7 is inserted into the through hole 6, and the fastening piece 7 tightly supports the magnet frame 5 in the elongated slot 4 against the upper surface of the driving wheel 14. The magnet frame 5 is matched with the upper surface of the driving wheel 14 through the fastening piece 7 to realize installation, when the detection position needs to be adjusted, the fastening piece 7 can be unscrewed or taken out, the magnet frame 5 is moved along the long groove 4, the magnet 2 is moved to the preset position, then the fastening piece 7 is inserted into the through hole 6 again, and the magnet frame 5 is abutted against the upper surface of the driving wheel 14.

In order to improve the detection sensitivity, it is further preferable that the magnet 2 is fixed to the outer end of the magnet holder 5 and positioned outside the long groove 4.

As shown in fig. 1, 2, 3, and 4, the magnetic switch 3 is movably disposed on the upper surface of the motor base 12.

Preferably, in this embodiment, a switch seat 8 is disposed on an upper surface of the motor seat 12, a mounting groove 9 is disposed on the switch seat 8, and the magnetic switch 3 is movably disposed in the mounting groove 9. More preferably, the magnetic switch 3 has the same cross section as the mounting groove 9. The sections of the magnetic switch and the magnetic switch are the same, so that the magnetic switch 3 can be moved, and the installation stability is ensured.

In this embodiment, the lower surface of the magnet 2 is close to the upper surface of the magnetic switch 3, and the detection sensitivity can be further improved. And the mounting groove 9 is formed on the switch base 8 such that the upper surface of the magnetic switch 3 is closer to the lower surface of the magnet 2. Of course, as another scheme, the mounting groove 9 may be directly designed on the upper surface of the motor base 12.

The working principle of the invention is as follows: when the sewing machine is operated, the driving wheel 14 can be driven by the motor to rotate, so that the rotating shuttle seat 1 is driven to synchronously rotate, and the rotating shuttle seat is matched with the trend of stitches. When the reset is needed, the driving wheel 14 rotates, when the magnet 2 rotates to a position close to the magnetic switch 3 on the motor base 12, the magnetic switch 3 can feed back a detection signal to the electric control system, and the electric control system can define the position as an original position.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.