Presser foot control device

Abstract

The utility model belongs to the technical field of sewing machines, and discloses a presser foot control device which comprises a motor and a connecting and fixing component arranged on the periphery of the motor. One end of the track cam is fixedly connected with a rotating shaft of the motor; one end of the presser foot driving lever is hinged with the connecting and fixing part, and the other end is provided with a roller; one end of the connecting rod transmission structure is hinged with the presser foot driving lever; the presser foot lifting front lever is hinged with one end of the connecting rod transmission structure; the periphery of the pressing rod is sleeved with a pressing rod guide sleeve hinged to the presser foot lifting front lever; the periphery of the pressing rod is sleeved with a pressure adjusting spring and a pressing rod guide frame. The presser foot structure is arranged at the bottom end of the pressing rod. The motor is used as a power source for lifting the presser foot, and the defects that an automatic presser foot lifting device adopting an electromagnet as a power source is high in noise, sewing materials are damaged due to the fact that the descending speed of the presser foot lifting device is too high, and the height of the automatic presser foot lifting device cannot be adjusted are overcome.

Description

Technical Field

[0001] This utility model belongs to the field of sewing machine technology, and in particular relates to a presser foot control device. Background Technology

[0002] Most existing sewing machines use electromagnets as a power source, driving the presser foot to rise and fall through the extension and retraction of the electromagnet core. The disadvantages of using electromagnets for automatic presser foot lifting include: high noise levels, excessively fast presser foot descent damaging the fabric, and the presser foot height not being adjustable. Furthermore, knee-controlled presser foot lifting is mechanical, requiring significant torque and strenuous operation for the operator. Some existing sewing machines also use motors as a power source, but these only lift the presser foot and cannot lift the lower presser foot. Utility Model Content

[0003] The purpose of this invention is to solve the above problems and provide a presser foot control device.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a presser foot control device, comprising a motor and a connecting and fixing component disposed on its outer periphery;

[0005] A track cam, one end of which is fixedly connected to the motor shaft; a track is formed on the surface of the track cam;

[0006] The presser foot drives the lever, one end of which is hinged to the connecting and fixing component, and the other end is equipped with a roller, which is placed in the track of the track cam;

[0007] A linkage transmission structure, one end of which is hinged to the pressure foot drive lever;

[0008] The lever in front of the lifting foot is hinged to the other end of the linkage transmission structure;

[0009] The pressure rod is fitted with a pressure rod guide sleeve that is hinged to the front lever of the lifting pressure foot; the pressure rod is fitted with an adjusting spring and a pressure rod guide frame, one end of the adjusting spring is fixed to the pressure rod guide sleeve, and the other end is fixed to the pressure rod guide frame;

[0010] The pressure foot structure is located at the bottom end of the pressure bar;

[0011] When the motor rotates forward or reverse, it applies force to the presser foot structure through the presser foot drive lever and linkage transmission structure, thereby driving the presser foot structure to lift or lower.

[0012] According to this utility model, the linkage transmission structure further includes a lifting and pressing rear lever linkage with one end hinged to the pressing foot drive lever, a lifting pressing foot rear lever with the other end hinged to the other end of the lifting pressing foot rear lever with the other end hinged to the other end of the lifting pressing foot linkage with the other end hinged to one end of the lifting pressing foot front lever.

[0013] According to this utility model, the top of the pressure rod is provided with a pressure foot preload spring, a pressure rod upper cap and a pressure rod upper sleeve in sequence from top to bottom, and there is a gap between the pressure rod upper sleeve and the pressure rod guide sleeve.

[0014] According to this utility model, the presser foot structure is further defined as follows: the movable presser foot handle and the movable presser foot base plate are hinged together and connected to the bottom end of the presser rod.

[0015] According to this utility model, a lifting foot bracket is further provided on the outer periphery of the pressure rod. The lifting foot bracket is located at the interval between the upper sleeve of the pressure rod and the guide sleeve of the pressure rod. A manual lifting foot push rod is connected to the lifting foot bracket. A manual lifting foot cam and a pressure foot wrench connected to the manual lifting foot cam are provided at the end of the manual lifting foot push rod away from the pressure rod.

[0016] Compared with the prior art, the beneficial effects of this utility model are: This utility model uses a motor as the power source for lifting the presser foot, which is different from the common use of electromagnets as the power source in the market. This solves the common disadvantages of automatic presser foot lifting with electromagnets as the power source, such as high noise, excessively fast descent speed of the presser foot damaging the sewing material, and non-adjustable height of the automatic presser foot.

[0017] Compared with existing solutions that use an electric motor as a power source, this utility model has a pre-tensioning spring in its structure to reduce the pressure applied by the stepper motor and make the pressure change more stable. Attached Figure Description

[0018] Figure 1 This is a first-view structural schematic diagram of a presser foot control device according to the present invention;

[0019] Figure 2 This is a second-view structural schematic diagram of a presser foot control device according to the present invention;

[0020] Figure 3 This is a schematic diagram showing the connection between the rotary cam and the pressure foot drive lever of this utility model;

[0021] Figure 4 This is a schematic diagram of the linkage transmission structure of this utility model. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only one embodiment of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] like Figure 1 and Figure 2As shown, this application embodiment provides a presser foot control device for a sewing machine, wherein a motor 1 is fixed on a motor bracket 3, the motor bracket 3 is hinged to one end of a presser foot drive lever 5, one end of a track cam 2 is fixed on the rotating shaft of the motor 1, the roller 6 of the presser foot drive lever 5 is placed in the track of the track cam 2, the other end of the presser foot drive lever 5 is hinged to one end of a lifting and pressing lever connecting rod 7 by a shaft screw, the other end of the lifting and pressing lever connecting rod 7 is hinged to one end of a lifting presser foot rear lever 9 by a shaft screw, the other end of the lifting presser foot rear lever 9 is hinged to one end of a lifting presser foot connecting rod 11 by a shaft screw, and the other end of the lifting presser foot connecting rod 11 is hinged to the lifting presser foot front lever 12. One end is hinged, and the other end of the lever 12 before lifting the presser foot is hinged to the pressure rod guide sleeve 23. The outer periphery of the pressure rod guide sleeve 23 has a groove, and the needle rod connecting column slider 22 is placed in the groove. The vertically arranged pressure rod 17 passes through the pressure rod guide sleeve 23, the pressure adjustment spring 24, the pressure rod guide frame 25, and the pressure rod bushing 26 from top to bottom. The top of the pressure rod 17 is provided with the presser foot pre-compression spring 14, the pressure rod upper cap 15, and the pressure rod upper sleeve 16 from top to bottom. There is a gap between the pressure rod upper sleeve 16 and the pressure rod guide sleeve 23. The movable presser foot handle 27 and the movable presser foot base plate 28 are hinged by the presser foot connecting screw 29. The finger guard 30 is placed in the gap between the flat washer and the screw, and the assembly with the bottom end of the pressure rod 17 is completed.

[0024] A presser foot support 21 is provided on the outer periphery of the presser rod 17. The presser foot support 21 is located at the interval between the upper sleeve 16 of the presser rod and the guide sleeve 23 of the presser rod. A manual presser foot lifting rod 20 is connected to the presser foot lifting rod 21. A manual presser foot lifting cam 19 and a presser foot wrench 18 connected to the manual presser foot lifting cam 19 are provided at the end of the manual presser foot lifting rod 20 away from the presser rod 17. By rotating the presser foot wrench 18, the manual presser foot lifting rod 20 moves axially along the presser rod 17. After the position is adjusted, the presser foot wrench 18 is rotated in the opposite direction to lock the manual presser foot lifting rod 20.

[0025] When the electronic control device connected to motor 1 sends a signal to lift the pressure foot, motor 1 rotates counterclockwise by a certain angle from the reference position. The track cam 2, fixed to the rotating shaft of motor 1, swings by the same angle. Figure 1 and Figure 3As shown, the ball bearing 6 causes the presser foot drive lever 5 to rotate counterclockwise around the shaft screw. The other end of the presser foot lifting crank 7 pushes the lifting lever connecting rod 7 to move axially. The other end of the lifting lever connecting rod 7 pushes the presser foot lifting rear lever 9, causing the presser foot lifting rear lever 9 to rotate counterclockwise around the shaft screw by a certain angle. The other end of the presser foot lifting rear lever 9 drives the presser foot lifting connecting rod 11 to move. The presser foot lifting connecting rod 11 causes the presser foot front lever 12 to rotate counterclockwise around the rotation center. The other end of the presser foot front lever 12 drives the pressure rod 17 to slide upward in the inner hole of the pressure rod guide sleeve 23, realizing the presser foot lifting action. The motor rotates in the opposite direction, and under the pressure of the pressure adjusting spring 24, the pressure rod 17 slides downward in the inner hole of the pressure rod guide sleeve 23, realizing the presser foot lowering action. This realizes the lifting and lowering action of the presser foot.

[0026] The working principle of this invention is as follows: A motor controls the presser foot mechanism. The motor rotates in one direction, lowering the presser foot. After the presser foot contacts the fabric, the continuous rotation of the motor applies pressure to the fabric. Different rotation angles result in different pressures, thus controlling the pressing force. Conversely, when the motor rotates in the opposite direction, the presser foot is lifted. Different rotation angles result in different lifting amounts, thus achieving complete control of the presser foot mechanism. Furthermore, by setting the motor speed, the automatic lifting and lowering of the presser foot can be quiet and gentle. The operator can adjust the lifting and lowering speed of the presser foot according to their work rhythm and the lifting height according to the thickness of the fabric, thereby improving efficiency. For easily damaged fabrics, the system can control the motor to ensure gentle presser foot placement without damaging the fabric. The motor-driven presser foot lifting makes the sewing machine structure more compact and reduces costs. The mechanism described in this invention, installed inside the machine cavity, is beneficial for the sewing machine's aesthetics, packaging, and transportation.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A presser foot control device, characterized in that, include, The motor has connecting and fixing components on its outer periphery; A track cam, one end of which is fixedly connected to the motor shaft; a track is formed on the surface of the track cam; The presser foot drives the lever, one end of which is hinged to the connecting and fixing component, and the other end is equipped with a roller, which is placed in the track of the track cam; A linkage transmission structure, one end of which is hinged to the pressure foot drive lever; The lever in front of the lifting foot is hinged to the other end of the linkage transmission structure; The pressure rod is fitted with a pressure rod guide sleeve that is hinged to the front lever of the lifting pressure foot; the pressure rod is fitted with an adjusting spring and a pressure rod guide frame, one end of the adjusting spring is fixed to the pressure rod guide sleeve, and the other end is fixed to the pressure rod guide frame; The pressure foot structure is located at the bottom end of the pressure bar; When the motor rotates forward or reverse, it applies force to the presser foot structure through the presser foot drive lever and linkage transmission structure, thereby driving the presser foot structure to lift or lower.

2. The presser foot control device as described in claim 1, characterized in that, The linkage transmission structure includes a lifting and pressing rear lever linkage with one end hinged to the pressing foot drive lever, a lifting pressing foot rear lever with the other end hinged to the other end of the lifting pressing foot rear lever, a lifting pressing foot linkage with the other end of the lifting pressing foot linkage, and a lifting pressing foot linkage with the other end of the lifting pressing foot linkage hinged to one end of the lifting pressing foot front lever.

3. The presser foot control device as described in claim 1, characterized in that, The top of the pressure rod is provided with a pressure foot preload spring, a pressure rod upper cap and a pressure rod upper sleeve in sequence from top to bottom, and there is a gap between the pressure rod upper sleeve and the pressure rod guide sleeve.

4. The presser foot control device as described in claim 1, characterized in that, The presser foot structure consists of a movable presser foot handle and a movable presser foot base plate that are hinged together and connected to the bottom end of the presser rod.

5. The presser foot control device as described in claim 3, characterized in that, A lifting foot bracket is provided on the outer periphery of the pressure rod. The lifting foot bracket is located at the interval between the upper sleeve of the pressure rod and the guide sleeve of the pressure rod. A manual lifting foot push rod is connected to the lifting foot bracket. A manual lifting foot cam and a pressure foot wrench connected to the manual lifting foot cam are provided at the end of the manual lifting foot push rod away from the pressure rod.

Images