Presser foot driving mechanism of sewing machine

Abstract

The utility model provides a presser foot driving mechanism of a sewing machine, which comprises a casing, a feeding presser foot, a feed lifting cam capable of driving the feeding presser foot to move up and down, and a transmission component arranged between the feeding presser foot and the feed lifting cam, the casing comprises a panel cavity and a cavity, the feed lifting cam is arranged in the cavity, and the feed lifting cam is arranged in the cavity. The transmission assembly comprises a first feed lifting crank with one end connected with the feed lifting cam, a transmission shaft and a feed lifting swing rod hinged to an external structure of the transmission assembly, and further comprises a second feed lifting crank capable of driving the feed lifting swing rod to generate corresponding actions. The feed presser foot is provided with a feed lifting driving block matched with the feed lifting swing rod, the first feed lifting crank and the second feed lifting crank are both arranged on the transmission shaft, and an opening facilitating adjustment of the angle of the feed lifting cam is formed in the position, located at the upper end of the cavity, of the machine shell. The utility model has the advantages of high adjustability, wide application range and easiness in cleaning.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, in particular to a presser foot driving mechanism of a sewing machine. Background Art

[0002] Generally, the machine shell of a sewing machine is divided into two cavities by a partition board, including a panel cavity and a cavity. The panel cavity usually has a needle bar, a driving assembly and a transmission assembly of the presser foot, including a presser foot lifting cam provided by the presser foot driving mechanism. The presser foot lifting cam is arranged in the panel cavity, and its installation method is limited, occupying space. When the lifting cam is lubricated, the lubricating oil is easy to seep out and flow to other connecting rod assemblies in the panel cavity, which is not easy to clean. The lubricating oil may also flow to the fabric through components such as the needle bar or the presser foot, causing pollution to the fabric. At the same time, the existing lifting cams are usually fixedly connected to the driving shaft and cannot be adjusted, so the initial position of the lifting cam cannot be adjusted. At the same time, the main presser foot and the feeding presser foot are usually synchronously controlled and cannot be separated, and the position adjustment of the feeding presser foot is limited. Summary of the Invention

[0003] In order to solve the above problems of the prior art, the utility model provides a presser foot driving mechanism of a sewing machine, which separates the presser foot lifting cam and the presser foot transmission connecting rod into two cavities, achieving dry-wet separation and facilitating cleaning. The fixed lifting cam is changed to a movable one, which can adjust the phase of the presser foot and change the height of the presser foot.

[0004] The technical scheme adopted is as follows:

[0005] A presser foot driving mechanism of a sewing machine includes a machine shell, and also includes a feeding presser foot, a lifting cam capable of driving the feeding presser foot to move up and down, and a transmission assembly arranged between the feeding presser foot and the lifting cam. The machine shell includes a panel cavity and a cavity. The lifting cam is arranged in the cavity and is adjustably arranged on the driving shaft for driving the presser foot up and down. The transmission assembly includes a first lifting crank connected to one end of the lifting cam, a transmission shaft, and a lifting swing rod hinged to an external structure of the transmission assembly. It also includes a second lifting crank capable of driving the lifting swing rod to generate corresponding actions. The feeding presser foot is provided with a lifting driving block matched with the lifting swing rod. The first and second lifting cranks are both arranged on the transmission shaft. An opening is provided at the upper end of the cavity of the machine shell to facilitate adjusting the angle of the lifting cam.

[0006] Further, the lifting cam is an eccentric cam.

[0007] Further, the feeding presser foot is arranged on a feeding presser foot lever. The lifting driving block is arranged on the feeding presser foot lever. A first return spring for resetting the feeding presser foot is further arranged on the feeding presser foot lever above the lifting driving block.

[0008] Further, a main presser foot, a main presser foot lever for mounting the main presser foot, a presser foot lever guide provided on the main presser foot lever, and a second return spring provided at the upper end of the main presser foot lever located on the presser foot lever guide are further provided in the panel cavity.

[0009] Further, the lifting swing rod is hinged to the presser foot lever guide.

[0010] Further, a thread loosening electromagnet is provided on one side of the panel cavity located at the transmission assembly.

[0011] Further, the panel cavity and the cavity are separated by a partition.

[0012] Further, the lifting swing rod includes a long handle and a short handle, and there is an included angle between the long handle and the short handle.

[0013] Further, the long handle is provided on one side of the second lifting crank, and a first cam cooperating with the long handle is provided on the second lifting crank; the short handle is provided at the lower end of the lifting driving block, and a second cam cooperating with the short handle is provided on the lifting driving block.

[0014] Compared with the prior art, the beneficial effects produced by the present utility model are as follows:

[0015] The present utility model provides a presser foot driving mechanism for a sewing machine. The lifting cam for driving the feeding presser foot is provided in the cavity of the sewing machine housing and is separately arranged from the presser foot lever, transmission assembly, etc. in the panel cavity. The advantages are as follows:

[0016] (1) Realize dry-wet separation, which not only ensures the lubrication when the lifting cam runs at high speed but also solves the problem of oil leakage.

[0017] (2) After the lifting cam is changed to a movable type, the feeding time can be adjusted, and the applicable fabric range is wider.

[0018] (3) Since the lifting cam is arranged in the cavity, the space in the panel cavity is vacated, and this space can be used to install a thread loosening electromagnet.

[0019] (4) After separation, the main presser foot and the feeding presser foot can be independently controlled, and the position of the feeding presser foot is easy to adjust, and the synchronous phase of the main presser foot associated with the feeding presser foot will not change due to the adjustment of the original structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is an overall structural schematic diagram of one angle of the present utility model;

[0021] Figure 2 is an overall structural schematic diagram of another angle of the present utility model;

[0022] Figures 3-5 is a schematic diagram of the presser foot driving mechanism of the present utility model;

[0023] Among them, the machine shell 1, the panel cavity 101, the cavity 102, the feeding presser foot 2, the lifting cam 3, the transmission assembly 4, the first lifting crank 401, the transmission shaft 402, the second lifting crank 403, the feeding presser foot lever 5, the lifting drive block 501, the first return spring 502, the thread loosening electromagnet 6, the main presser foot 7, the main presser foot lever 701, the lever guide 702, the second return spring 703, the lifting swing rod 8, the long handle 801, the short handle 802, the opening 9, the partition 10, the first cam 11, the second cam 12, and the drive shaft 13. Specific embodiments

[0024] The following further describes the present utility model in conjunction with specific embodiments.

[0025] Reference Figures 1-5 , a presser foot driving mechanism of a sewing machine, including a machine shell 1, further including a feeding presser foot 2, a lifting cam 3 that can drive the feeding presser foot to move up and down, and a transmission assembly 4 disposed between the feeding presser foot 2 and the lifting cam 3. The machine shell 1 includes a panel cavity 101 and a cavity 102. The lifting cam 3 is disposed in the cavity 102 and is adjustably disposed on the drive shaft 13 for driving the presser foot. The transmission assembly 4 includes a first lifting crank 401 having one end connected to the lifting cam 3, a transmission shaft 402, and a lifting swing rod 8 hinged to an external structure of the transmission assembly. It further includes a second lifting crank 403 that can drive the lifting swing rod 8 to generate corresponding movements. The feeding presser foot 2 is provided with a lifting drive block 501 that cooperates with the lifting swing rod 8. The first and second lifting cranks are both disposed on the transmission shaft 402. An opening 9 is provided at the upper end of the machine shell 1 in the cavity 102 to facilitate adjusting the angle of the lifting cam.

[0026] An opening 9 is provided on the upper end surface of the machine shell 1, and the angle of the lifting cam 3 can be adjusted in time through the opening 9.

[0027] The panel cavity 101 and the cavity 102 are separated by a partition 10. The lifting cam 3 is disposed in the cavity 102 and is separately arranged from the feeding presser foot and its transmission assembly. The lifting cam 3 is disposed in the cavity 102, leaving the space of the panel cavity empty. This space can be used to install the thread loosening electromagnet 6. The thread loosening electromagnet 6 is disposed on one side of the panel cavity 101 where the transmission assembly 4 is located. During the operation of the sewing machine, the thread can be controlled to be loosened and tightened through the thread loosening electromagnet 6.

[0028] The lifting cam is disposed in the cavity, realizing dry and wet separation. The lubricating oil used by the lifting cam will only drip into the cavity and will not penetrate into other parts such as the transmission assembly or the feeding presser foot, and will not contaminate the fabric. It not only ensures the lubrication of the lifting cam during high-speed operation but also solves the problem of oil leakage;

[0029] The lifting cam 3 described above is an eccentric cam. The feeding presser foot 2 is arranged on the feeding presser foot lever 5. A lifting drive block 501 is provided on the feeding presser foot lever 5, and a first return spring 502 for resetting the feeding presser foot is also provided on the feeding presser foot lever 5. The first return spring 502 is arranged at the upper end of the lifting drive block 501.

[0030] A main presser foot 7, a main presser foot lever 701 for installing the main presser foot 7, a lever guide 702 arranged on the main presser foot lever, and a second return spring 703 arranged at the upper end of the main presser foot lever and located above the lever guide are further provided in the panel cavity 101. The lifting swing rod 8 is hinged to an external structure of the transmission assembly, and a rotation fulcrum of the lifting swing rod 8 is provided on the external structure, enabling the lifting swing rod 8 to rotate. Preferably, the lifting swing rod 8 is hinged and arranged on the lever guide 702.

[0031] The lifting cam is adjustably arranged on the drive shaft 13. The angle between the lifting cam 3 and the first lifting crank 401 can be adjusted to change the initial position of the lifting cam 3, thereby changing the degree to which the lifting cam 3 drives the feeding presser foot 2 to lift, adjusting the feeding time, and the lifting height can be adjusted according to the thickness of the fabric, making the applicable fabric range wider.

[0032] The lifting swing rod 8 includes a long handle 801 and a short handle 802, and there is an angle between the long handle 801 and the short handle 802. The long handle 801 is arranged on one side of the second lifting crank 403, and a first cam 11 cooperating with the long handle 801 is provided on the second lifting crank 403; the short handle 802 is arranged at the lower end of the lifting drive block 501, and a second cam 12 cooperating with the short handle 802 is provided on the lifting drive block 501.

[0033] The lifting cam 3 is arranged on the drive shaft 13, and the lifting cam 3 is an eccentric cam. Taking the figure as a reference, when the drive shaft 13 rotates counterclockwise, it will drive the lifting cam 3 to rotate counterclockwise together. Since one end of the lifting cam 3 is connected to the first lifting crank 401, when the lifting cam 3 rotates, the first lifting crank 401 will swing accordingly, thereby driving the transmission shaft 402 to rotate clockwise. After the transmission shaft 402 rotates, it drives the second lifting crank 403 to move towards the long handle 801 of the lifting swing rod 8. At this time, the first cam 11 will push the long handle 801, and at the same time, the short handle 802 will lift, pushing the second cam 12, that is, pushing the lifting drive block 501 to drive the feeding presser foot 2 to lift.

[0034] When the drive shaft 13 rotates clockwise, the second lifting crank 403 moves away from the long handle 801 direction, and the feeding presser foot 2 is reset under the drive of the first return spring 502.

[0035] The described lifter cam 3 can independently control the lifting of the feeding presser foot, and will not change the synchronous phase of the main presser foot associated with the feeding presser foot due to the adjustment of the original structure. It can independently control the feeding presser foot, with higher adjustability and wider applicability.

[0036] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structural transformation made by using the content of the specification and drawings of the present invention under the inventive concept of the present invention, or any direct / indirect application in other related technical fields is included in the patent protection scope of the present invention.

Claims

1. A presser foot driving mechanism for a sewing machine, comprising a housing (1), a feed presser foot (2), a tooth lifting cam (3) capable of driving the feed presser foot to move up and down, and a transmission assembly (4) disposed between the feed presser foot (2) and the tooth lifting cam (3), wherein the housing (1) comprises a panel cavity (101) and a cavity (102), and is characterized in that: The tooth-lifting cam (3) is arranged in the mold cavity (102) and can be adjusted on the driving shaft (13) driving the lifting foot. The transmission assembly (4) includes a first tooth-lifting crank (401) connected to the tooth-lifting cam (3) at one end, a transmission shaft (402) and a tooth-lifting swing rod (8) hinged to the external structure of the transmission assembly, and also includes a second tooth-lifting crank (403) capable of driving the tooth-lifting swing rod (8) to produce a corresponding action. The feeding presser foot (2) is provided with a tooth-lifting driving block (501) matched with the tooth-lifting swing rod (8). The first and second tooth-lifting cranks are both arranged on the transmission shaft (402). The housing (1) is located at the upper end of the mold cavity (102) and is provided with an opening (9) for facilitating the adjustment of the tooth-lifting cam angle.

2. The presser foot driving mechanism of a sewing machine according to claim 1, characterized in that: The tooth lifting cam (3) is an eccentric cam.

3. The presser foot driving mechanism of a sewing machine according to claim 1, characterized in that: The feed presser foot (2) is arranged on the feed presser foot pressure rod (5), the tooth lifting drive block (501) is arranged on the feed presser foot pressure rod (5), and a first return spring (502) for returning the feed presser foot to its original position is arranged on the feed presser foot pressure rod (5) at the upper end of the tooth lifting drive block (501).

4. The presser foot driving mechanism of a sewing machine according to claim 1, characterized in that: The panel cavity (101) is also provided with a main presser foot (7), a main presser foot pressure rod (701) for mounting the main presser foot (7), a pressure rod guide frame (702) arranged on the main presser foot pressure rod, and a second return spring (703) arranged on the main presser foot pressure rod and located at the upper end of the pressure rod guide frame.

5. The presser foot driving mechanism of a sewing machine according to claim 4, characterized in that: The tooth lifting swing rod (8) can be hinged on the pressure rod guide frame (702).

6. The presser foot driving mechanism of a sewing machine according to claim 1, characterized in that: The panel cavity (101) is located on one side of the transmission assembly (4) and is provided with a wire loosening electromagnet (6).

7. The presser foot driving mechanism of a sewing machine according to claim 1, characterized in that: The panel cavity (101) and the cavity (102) are separated by a partition (10).

8. The presser foot driving mechanism of a sewing machine according to claim 1, characterized in that: The tooth-lifting swing rod (8) comprises a long handle (801) and a short handle (802), and an angle exists between the long handle (801) and the short handle (802).

9. The presser foot driving mechanism of a sewing machine according to claim 8, characterized in that: The long handle (801) is arranged on one side of the second tooth lifting crank (403), and the second tooth lifting crank (403) is provided with a first cam (11) that cooperates with the long handle (801); the short handle (802) is arranged at the lower end of the tooth lifting drive block (501), and the tooth lifting drive block (501) is provided with a second cam (12) that cooperates with the short handle (802).

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