Sewing machine with needle bar and presser foot bar capable of rotating synchronously

Abstract

The sewing machine with the needle rod and the presser foot rod capable of synchronously rotating comprises a sewing machine table, a table plate and a sewing machine head, a first rotation driving motor is arranged in the sewing machine head and is in transmission connection with a first rotating shaft assembly, and one end of the first rotating shaft assembly is in transmission connection with a crank assembly; the crank assembly is in transmission connection with a spline needle rod, the spline needle rod is sleeved with a first spline shaft assembly, a first rotation driving assembly is arranged on one side of the first spline shaft assembly, a presser foot rod lifting assembly is arranged on one side of the first spline shaft assembly, and a presser foot rod lifting base is arranged at the bottom of the presser foot rod lifting assembly. A second spline shaft assembly is arranged on the presser foot rod lifting seat, a presser foot rod assembly is arranged at the bottom of the second spline shaft assembly, the spline needle rod is arranged on the second spline shaft assembly in a sleeving mode, and the spline needle rod, the presser foot rod assembly and the platen are matched for sewing operation; according to the sewing machine, a user can conveniently and synchronously rotate the needle rod and the presser foot rod, so that the sewing efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of sewing machines, in particular to a sewing machine with a needle bar and a presser foot bar capable of synchronous rotation. Background Art

[0002] A sewing machine mainly comprises a thread guide assembly, a needle bar, a presser foot, a needle hole plate, and a shuttle bed mechanism. The thread guide assembly, the needle bar, and the presser foot are mounted on the sewing machine head, the needle hole plate is mounted on the table, and the shuttle bed mechanism is mounted on the bottom of the table.

[0003] The basic principle of the sewing machine is: the thread shifting assembly provides sewing thread for the needle of the needle bar, the material is placed on the table, the sewing part of the material is aligned with the needle hole plate, the needle of the needle bar, the presser foot and the needle hole plate are aligned, the needle of the needle bar rises and falls back and forth and passes through the presser foot and the needle hole plate, and cooperates with the shuttle bed mechanism to generate the sewing thread of the material. During the sewing process, the presser foot rises and falls back and forth following the sewing rhythm, and presses and relaxes the material back and forth. In addition, the table also has a feed foot, which moves the material forward when the presser foot is relaxed.

[0004] At present, in the development of sewing machines, it is sometimes necessary to adjust the needle of the needle bar to adjust the direction of the thread (the thread passing through the hole of the needle is directional) to avoid thread disturbance and poor sewing quality caused by the thread direction, or to adapt to some sewing scenarios that require adjustment of the needle rotation direction. In the process of adjusting the needle of the needle bar, it is also necessary to adjust the rotation direction of the presser foot to avoid the rotation position of the presser foot having a bad influence on the thread.

[0005] However, currently, the rotation adjustment of the needle bar and the presser foot of the sewing machine is mainly performed separately. This separate adjustment of the needle bar and the presser foot has the disadvantages of being cumbersome to operate and taking too long to operate, resulting in a low sewing efficiency of the sewing machine.

[0006] If the needle bar and presser foot of the sewing machine can be rotated and adjusted synchronously, the above two defects can be overcome.

[0007] However, in the theoretical research of the industry, in the field of sewing machines, there is no better structure for synchronous rotation adjustment of the needle bar and the presser foot or a better technical idea to solve this defect.

[0008] (For example, documents such as CN205974966U and CN214088948U disclose technical ideas about synchronous motion in the field of sewing machines, but these structures are too complicated and the synchronous motion is not suitable for the installation of the needle bar and the presser foot bar. Therefore, they are not of much reference value at present.)

[0009] Therefore, the industry needs to overcome the above-mentioned defective difficulty. Therefore, the industry is in urgent need of a sewing machine in which the needle bar and the presser foot bar can be rotated and adjusted synchronously. Summary of the Invention

[0010] The purpose of the present invention is to overcome the above-mentioned defects in the prior art and provide a sewing machine in which the needle bar and the presser foot bar can rotate synchronously, so as to realize the synchronous rotation of the needle bar and the presser foot bar, thereby facilitating the user to rotate the needle bar and the presser foot bar synchronously, thereby improving sewing efficiency.

[0011] To achieve the above-mentioned purpose, the present invention provides a sewing machine in which a needle bar and a presser foot bar can rotate synchronously, comprising a sewing machine table, a table plate mounted on the sewing machine table, and a sewing machine head mounted on one side of the table plate and matched with the table plate, wherein a first rotary drive motor is installed inside the sewing machine head, the first rotary drive motor is transmission-connected to a first rotating shaft assembly, one end of the first rotating shaft assembly is transmission-connected to a crank assembly, the crank assembly is transmission-connected to a spline needle bar, the crank assembly is used to drive the spline needle bar to reciprocate and rise and fall, and the spline needle bar is sleeved with a first A spline shaft assembly, a first rotary drive assembly is installed on one side of the first spline shaft assembly, the first rotary drive assembly is used to drive the first spline shaft assembly to rotate reciprocally, a presser foot bar lifting assembly is installed on one side of the first rotating shaft assembly, a presser foot bar lifting seat is installed at the bottom of the presser foot bar lifting assembly, a second spline shaft assembly is installed on the presser foot bar lifting seat, a presser foot bar assembly is installed at the bottom of the second spline shaft assembly, the spline needle bar is sleeved on the second spline shaft assembly, and the spline needle bar, presser foot bar assembly and table cooperate to perform sewing operations.

[0012] Preferably, the first rotating shaft assembly includes a first coupling sleeved on the output shaft of the first rotary drive motor and a first rotating shaft sleeved on the first coupling, and the crank assembly is mounted on one end of the first rotating shaft.

[0013] Preferably, the crank assembly includes a crank block, a crank rod hinged at an eccentric point of the crank block, a lifting rod sleeve mounted on a spline needle rod and hinged to one end of the crank rod, and a clamping rod sleeve mounted on both ends of the lifting rod sleeve and mounted on the spline needle rod.

[0014] Preferably, the first spline shaft assembly includes a mounting sleeve mounted inside the sewing machine head, a first bearing mounted inside the mounting sleeve, a rotating guide sleeve rotatably connected to the inner ring of the first bearing, and a first spline nut mounted inside the rotating guide sleeve, and the spline needle rod is inserted into the first spline nut.

[0015] Preferably, the first rotary drive assembly includes a second rotary drive motor mounted on the sewing machine head and on one side of the first spline shaft assembly, a first bevel gear sleeved on the output shaft of the second rotary drive motor, and a second bevel gear meshing with the first bevel gear, the second bevel gear is sleeved on the first spline shaft assembly, and the second rotary drive motor can be used to drive the first spline shaft assembly to rotate reciprocatingly.

[0016] Preferably, the presser foot bar lifting assembly includes a first lifting assembly, a second lifting assembly and a lifting rod respectively connected to the first lifting assembly and the second lifting assembly in a transmission manner, the presser foot bar lifting seat is installed at the bottom of the lifting rod, guide rods are installed on both sides of the presser foot bar lifting seat, and the guide rods are slidably connected to the inside of the sewing machine head, the first lifting assembly includes a third rotary drive motor installed inside the sewing machine head, an angle transmission assembly installed on the output shaft of the third rotary drive motor, a second rotating shaft installed on the angle transmission assembly, a first rotating block installed at one end of the second rotating shaft, and a first rotating block installed at the bottom. The first lifting transmission block on the first rotating block and the first lifting guide block installed on the first lifting transmission block, the lifting rod is inserted into the first lifting guide block, the lifting rod is sleeved with a return spring, the first lifting block is located at the bottom or below the return spring, the second lifting assembly includes a synchronous swing connecting plate transmission connected to the first rotating shaft assembly, a swing slot block matched with the swing rod of the synchronous swing connecting plate, a first connecting rod installed on the swing slot block, and a second connecting rod installed between one end of the first connecting rod and the first lifting transmission block, the second connecting rod is connected to the first lifting transmission block.

[0017] Preferably, the second spline shaft assembly includes a second bearing mounted on the presser foot rod lifting seat, a presser foot rod rotating sleeve mounted on the inner ring of the second bearing, a second spline nut mounted inside the presser foot rod rotating sleeve, and a clamping plate mounted on the top of the second bearing, the spline needle bar is inserted on the second spline nut, and the presser foot rod assembly includes a presser foot rod connecting frame mounted on the bottom of the presser foot rod rotating sleeve and a presser foot mounted on the presser foot rod connecting frame, and the presser foot is for the sewing machine needle at the bottom of the spline needle bar to pass through.

[0018] Preferably, the invention further comprises a thread shifting assembly which is mounted on the sewing machine head and cooperates with the sewing machine needle at the bottom of the spline needle bar.

[0019] Preferably, the sewing machine head further includes a head housing.

[0020] Preferably, a movable needle plate is mounted on the table, a small needle plate cooperating with the spline needle rod is mounted on the movable needle plate, and a shuttle bed mechanism cooperating with the spline needle rod is mounted on the bottom of the movable needle plate.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. When the needle bar and presser foot do not need to rotate synchronously,

[0023] The first rotary drive motor provided in the present invention drives the first rotating shaft assembly to rotate, the first rotating shaft assembly drives the crank assembly to rotate, and the crank assembly drives the spline needle bar to rise or fall along the axis direction of the first spline shaft assembly and the second spline shaft assembly, thereby realizing the sewing operation of the needle bar;

[0024] The presser foot bar lifting assembly provided in the present invention is used to realize the presser foot bar lifting seat to rise or fall, thereby realizing the operation of the presser foot bar assembly rising or falling to reciprocately press the material.

[0025] 2. When the needle bar and presser foot need to be rotated synchronously,

[0026] The first rotation drive assembly provided in the present invention is used to drive the first spline shaft assembly to rotate, and the first spline shaft assembly drives the spline needle rod to rotate.

[0027] When the spline needle rod rotates, it drives the second spline shaft assembly to rotate, and the rotation of the second spline shaft assembly drives the presser foot rod assembly to rotate.

[0028] Thereby achieving synchronous rotation of the needle bar and the presser foot bar.

[0029] 3. The present invention provides a sewing machine in which the needle bar and the presser foot bar can rotate synchronously.

[0030] Firstly, it is used to realize synchronous rotation of the needle bar and the presser foot bar, thereby facilitating the user to synchronously rotate the needle bar and the presser foot bar, thereby improving sewing efficiency.

[0031] Secondly, through the structural characteristics of the sewing machine, the first rotary drive assembly, the first spline shaft assembly and the second spline shaft assembly are used to cooperate to achieve synchronous rotation of the needle bar and the presser foot bar. This structural setting produces an unexpected technical effect: that is, in a complex sewing machine structure, the spatial layout is greatly reduced, making the sewing machine structure more compact, and making the sewing machine easy to disassemble and repair, and reducing manufacturing costs. This structural setting is very popular in the sewing machine market, and facilitates the subsequent realization of sewing machine automation or facilitates the subsequent sewing machine to add structure and add new functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 1 is a schematic diagram of the exploded structure of a sewing machine in which a needle bar and a presser foot bar can rotate synchronously, provided by an embodiment of the present invention;

[0034] Figure 2 is a structural schematic diagram of a sewing machine head provided by an embodiment of the present invention;

[0035] Figure 3 This is a structural schematic diagram of a sewing machine head provided by an embodiment of the present invention, omitting the head housing;

[0036] Figure 4 Schematic diagram of the structure of the first rotary drive motor, the first rotating shaft assembly, the crank assembly, the spline needle bar, the first rotary drive assembly, the first spline shaft assembly, the second spline shaft assembly, the presser foot rod rotating sleeve, and the presser foot rod lifting assembly provided in an embodiment of the present invention;

[0037] Figure 5 1 is a structural diagram of a presser foot bar lifting assembly provided by an embodiment of the present invention;

[0038] Figure 6 The embodiment of the present invention provides a spline needle bar, a first rotary drive assembly, a first spline shaft assembly, a second spline shaft assembly, a presser foot rod rotating sleeve and a presser foot rod lifting assembly (ie Figure 4 Schematic diagram of the decomposition structure of the part);

[0039] Figure 7 The embodiment of the present invention provides a presser foot bar lifting assembly (ie Figure 5 Schematic diagram of the partial structure of the part).

[0040] Included in the diagram are:

[0041] 1. Sewing machine table; 2. Table; 21. Movable needle plate; 22. Small needle plate; 3. Sewing machine head; 30. Machine head housing; 41. First rotary drive motor; 42. First rotating shaft assembly; 421. First coupling; 422. First rotating shaft; 43. Crank assembly; 431. Crank block; 432. Crank rod; 433. Lifting rod sleeve; 434. Clamping rod sleeve; 44. Spline needle rod; 45. Thread-pulling assembly; 50. First rotary drive assembly; 500. Second rotary drive motor; 501. First bevel gear; 502. Second bevel gear; 51. First spline shaft assembly; 511. Mounting sleeve; 512. First bearing; 513. Rotating guide sleeve; 514. First spline nut; 52. Second spline shaft assembly; 52 1. Second bearing; 522. Presser foot rod rotating sleeve; 523. Second spline nut; 524. Pressing plate; 61. Presser foot rod lifting assembly; 611. First lifting assembly; 6111. Third rotary drive motor; 6112. Angle transmission assembly; 6113. Second rotating shaft; 6114. First rotating block; 6115. First lifting transmission block; 6116. First lifting guide block; 612. Second lifting assembly; 6121. Synchronous swing connecting plate; 6122. Swinging slot block; 6123. First connecting rod; 6124. Second connecting rod; 613. Lifting rod; 614. Guide rod; 615. Return spring; 62. Presser foot rod lifting seat; 63. Presser foot rod assembly; 631. Presser foot rod connecting frame; 632. Presser foot. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solution in this embodiment of the present invention in conjunction with the drawings in this embodiment of the present invention. Obviously, the embodiment described is only one embodiment of the present invention, not all embodiments of the present invention. Based on this embodiment of the present invention, all other embodiments of the present invention obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0043] See also Figures 1 to 7An embodiment of the present invention provides a sewing machine in which a needle bar and a presser foot bar can rotate synchronously, comprising a sewing machine table 1, a table plate 2 mounted on the sewing machine table 1, and a sewing machine head 3 mounted on one side of the table plate 2 and matched with the table plate 2. A first rotary drive motor 41 is installed inside the sewing machine head 3, and the first rotary drive motor 41 is transmission-connected to a first rotating shaft assembly 42. One end of the first rotating shaft assembly 42 is transmission-connected to a crank assembly 43, and the crank assembly 43 is transmission-connected to a spline needle rod 44. The crank assembly 43 is used to drive the spline needle rod 44 to reciprocate and rise and fall, and the spline needle rod 44 is sleeved with a first spline shaft assembly. 51. A first rotary drive assembly 50 is installed on one side of the first spline shaft assembly 51. The first rotary drive assembly 50 is used to drive the first spline shaft assembly 51 to rotate reciprocatingly. A presser foot bar lifting assembly 61 is installed on one side of the first rotating shaft assembly 42. A presser foot bar lifting seat 62 is installed at the bottom of the presser foot bar lifting assembly 61. A second spline shaft assembly 52 is installed on the presser foot bar lifting seat 62. A presser foot bar assembly 63 is installed at the bottom of the second spline shaft assembly 52. ​​The spline needle bar 44 is sleeved on the second spline shaft assembly 52. ​​The spline needle bar 44, the presser foot bar assembly 63 and the table 2 cooperate to perform sewing operations.

[0044] The first rotating shaft assembly 42 includes a first coupling 421 sleeved on the output shaft of the first rotary drive motor 41 and a first rotating shaft 422 sleeved on the first coupling 421 . The crank assembly 43 is mounted on one end of the first rotating shaft 422 .

[0045] The crank assembly 43 includes a crank block 431, a crank rod 432 hinged at an eccentric position of the crank block 431, a lifting rod sleeve 433 sleeved on the spline needle rod 44 and hinged to one end of the crank rod 432, and a clamping rod sleeve 434 mounted on both ends of the lifting rod sleeve 433 and sleeved on the spline needle rod 44. The crank block 431 is sleeved on one end of the first rotating shaft 422.

[0046] Among them, the first rotary drive motor 41 is used to drive the first rotating shaft 422 to rotate back and forth through a coupling, and the first rotating shaft 422 drives the crank block 431 of the crank assembly 43 to rotate, and the crank block 431 causes the crank rod 432 at its eccentric position to perform eccentric rotational motion, so that the crank rod 432 drives the lifting rod sleeve 433 to perform lifting and reciprocating motion, wherein the spline needle rod 44 is rotatably connected inside the lifting rod sleeve 433, and the clamping rod sleeve 434 clamps the spline needle rod 44, and the clamping rod sleeves 434 at both ends of the lifting rod sleeve 433 also clamp the lifting rod sleeve 433 at the same time. This structural setting allows the spline needle rod 44 to be rotatably set inside the lifting rod sleeve 433, and at the same time the lifting rod sleeve 433 can drive the spline needle rod 44 to move up and down.

[0047] The first spline shaft assembly 51 includes a mounting sleeve 511 installed inside the sewing machine head 3 (the mounting sleeve 511 is fixedly set in the sewing machine), a first bearing 512 installed inside the mounting sleeve 511, a rotating guide sleeve 513 rotatably connected to the inner ring of the first bearing 512, and a first spline nut 514 installed inside the rotating guide sleeve 513, and the spline needle rod 44 is inserted on the first spline nut 514.

[0048] The first rotary drive assembly 50 includes a second rotary drive motor 500 mounted on the sewing machine head 3 and on one side of the first spline shaft assembly 51, a first bevel gear 501 sleeved on the output shaft of the second rotary drive motor 500, and a second bevel gear 502 meshing with the first bevel gear 501. The second bevel gear 502 is sleeved on the first spline shaft assembly 51, and the second rotary drive motor 500 can be used to drive the first spline shaft assembly 51 to rotate reciprocatingly.

[0049] Among them, the second bevel gear 502 is sleeved on the rotating guide sleeve 513, the second rotating drive motor 500 of the first rotating drive assembly 50 is used to drive the first bevel gear 501 to rotate reciprocatingly, the first bevel gear 501 is used to drive the second bevel gear 502 to rotate reciprocatingly, and the second bevel gear 502 is used to drive the rotating guide sleeve 513 of the first spline shaft assembly 51 to rotate reciprocatingly, so that the rotating guide sleeve 513 drives the first spline nut 514 to rotate reciprocatingly, and finally the first spline nut 514 drives the spline needle rod 44 to rotate reciprocatingly.

[0050] The presser foot bar lifting assembly 61 includes a first lifting assembly 611, a second lifting assembly 612 and a lifting rod 613 that is respectively connected to the first lifting assembly 611 and the second lifting assembly 612 in a transmission manner. The presser foot bar lifting seat 62 is installed at the bottom of the lifting rod 613. Guide rods 614 are installed on both sides of the presser foot bar lifting seat 62. The guide rods 614 are slidably connected to the inside of the sewing machine head 3. The first lifting assembly 611 includes a third rotary drive motor 6111 installed inside the sewing machine head 3, an angle transmission assembly 6112 installed on the output shaft of the third rotary drive motor 6111, a second rotating shaft 6113 installed on the angle transmission assembly 6112, a first rotating block 6114 installed at one end of the second rotating shaft 6113, and a first rotating block 6114 installed on the first rotating block 6114. The first lifting transmission block 6115 and the first lifting guide block 6116 installed on the first lifting transmission block 6115, the lifting rod 613 is inserted into the first lifting guide block 6116, the lifting rod 613 is sleeved with a return spring 615, the first lifting block is located at the bottom or below the return spring 615, the second lifting assembly 612 includes a synchronous swing connecting plate 6121 that is transmission-connected to the first rotating shaft assembly 42, a swing slot block 6122 that cooperates with the swing rod of the synchronous swing connecting plate 6121, a first connecting rod 6123 installed on the swing slot block 6122, and a second connecting rod 6124 installed between one end of the first connecting rod 6123 and the first lifting transmission block 6115, the second connecting rod 6124 is connected to the first lifting transmission block 6115.

[0051] Among them, the synchronous swing connecting plate 6121 is sleeved on the first rotating shaft 422, and the design purpose of the presser foot bar lifting assembly 61 is to drive the presser foot bar lifting seat 62 to lift and reciprocate. Among them, the presser foot bar lifting assembly 61 adopts two lifting assemblies (i.e., the first lifting assembly 611 and the second lifting assembly 612) plus a return spring 615 to ensure that the presser foot bar assembly 63 can be lifted up and has sufficient pressing force when pressed down. Its specific working principle is: the third rotary drive motor 6111 of the first lifting assembly 611 is used to drive the angle transmission assembly 6112 to rotate, so that the angle transmission assembly 6112 drives the second rotating shaft 6113 to rotate, and the angle transmission assembly 6112 includes a gear sleeved on the output shaft of the third rotary drive motor 6111 The arc gear is connected to the second rotating shaft 6113 and the angle proximity sensor is installed on one side of the arc gear. The gear is meshed with the arc gear. The angle proximity sensor is used to sense the rotation angle stroke of the arc gear (the angle proximity sensor is used to control the rotation angle of the arc gear. When the arc gear rotates once, the angle proximity sensor receives the sensing information and controls the third rotation drive motor 6111 to stop, and then rotates in the opposite direction). The rotation angle of the arc gear corresponds to the rising and falling amplitude of the presser foot lifting seat 62. When the arc gear rotates, it will drive the second rotating shaft 6113 to rotate. The rotation of the second rotating shaft 6113 drives the first rotating block 6114 to rotate. The first rotating block 6114 rotates The first lifting transmission block 6115 is driven to rotate, and the first lifting transmission block 6115 rotates to provoke the first lifting guide block 6116 to rise or fall, so that the first lifting guide block 6116 drives the lifting rod 613 to rise or fall (when the lifting rod 613 rises, the first lifting guide block 6116 will contact the bottom of the return spring 615 and squeeze the return spring 615. At this time, the driving force provided by the first lifting component 611 may be insufficient. At this time, the second lifting component 612 is required to assist in exerting force. When the lifting rod 613 falls, the return spring 615 will press the first lifting guide block 6116 downward, thereby providing sufficient clamping force for the lifting rod 613). When the first rotating shaft 422 on the first rotating shaft assembly 42 rotates When the first rotating shaft 422 moves, the first rotating shaft 422 will drive the synchronous swing connecting plate 6121 of the second lifting assembly 612 to swing (because the end of the synchronous swing connecting plate 6121 connected to the first rotating shaft 422 is an eccentric sleeve), and the synchronous swing connecting plate 6121 swings, so that the swing rod of the synchronous swing connecting plate 6121 moves along the swing groove of the swing groove block 6122 and further abuts the upper end or the lower end of the swing groove. When the swing rod abuts the upper end or the lower end of the swing groove, the synchronous swing connecting plate 6121 drives the swing groove block 6122 to swing up or down, so that the swing groove block 6122 drives the first connecting rod 6123 to swing up or down, and the first connecting rod 6123 drives the second connecting rod 6124 to swing up or down.The second connecting rod 6124 drives the first lifting transmission block 6115 to swing upward or downward.

[0052] Therefore, to sum up, the first lifting assembly 611 drives the first lifting rotating block to rotate along a certain angle. During the rotation, the second lifting assembly 612 drives the first lifting transmission block 6115 to swing upward or downward, thereby ensuring that the lifting rod 613 can lift the presser foot rod lifting seat 62 and the presser foot rod assembly 63 upward and has sufficient clamping force when pressed down.

[0053] Furthermore, when the lifting rod 613 drives the presser foot rod lifting seat 62 to lift and reciprocate, the guide rod 614 guides the presser foot rod lifting seat 62, so that the lifting and lowering of the presser foot rod lifting seat 62 is stable.

[0054] The second spline shaft assembly 52 includes a second bearing 521 mounted on the presser foot bar lifting seat 62, a presser foot bar rotating sleeve 522 mounted on the inner ring of the second bearing 521, a second spline nut 523 mounted inside the presser foot bar rotating sleeve 522, and a clamping plate 524 mounted on the top of the second bearing 521. The spline needle bar 44 is inserted on the second spline nut 523. The presser foot bar assembly 63 includes a presser foot bar connecting frame 631 mounted on the bottom of the presser foot bar rotating sleeve 522 and a presser foot 632 mounted on the presser foot bar connecting frame 631. The presser foot 632 is for the sewing machine needle at the bottom of the spline needle bar 44 to pass through.

[0055] When the first rotary drive assembly 50 drives the first spline shaft assembly 51 to rotate, the first spline shaft assembly 51 drives the spline needle rod 44 to rotate, and the spline needle rod 44 thereby drives the second spline shaft assembly 52 to rotate, wherein the spline needle rod 44 drives the second spline nut 523 of the second spline shaft assembly 52 to rotate, and the second spline nut 523 drives the presser foot rod rotating sleeve 522 to rotate, and the presser foot rod rotating sleeve 522 drives the presser foot rod assembly 63 to rotate, thereby causing the spline needle rod 44 and the presser foot 632 of the presser foot rod assembly 63 to rotate.

[0056] The sewing machine in which the needle bar and the presser foot bar can rotate synchronously further includes a thread shifting assembly 45 mounted on the sewing machine head 3 and cooperating with the sewing machine needle at the bottom of the spline needle bar 44. The thread shifting assembly 45 provides sewing thread to the needle of the spline needle bar 44, and the sewing thread of the needle of the spline needle bar 44 cooperates with the sewing thread of the shuttle mechanism so that the sewing thread is sewn on the material.

[0057] The sewing head 3 further includes a head housing 30 .

[0058] A movable needle plate 21 is mounted on the table 2 , a small needle plate 22 that cooperates with the spline needle rod 44 is mounted on the movable needle plate 21 , and a shuttle bed mechanism that cooperates with the spline needle rod 44 is mounted on the bottom of the movable needle plate 21 .

[0059] In addition, it is necessary to add:

[0060] In the first spline shaft assembly 51, the rotating guide sleeve 513 has a first step at its top, which abuts the top of the first bearing 512. A compression sleeve is provided at its bottom, abutting the bottom of the first bearing 512. A sensing block protrudes from one end of the compression sleeve, and a proximity sensor is mounted on one side of the sensing block. This arrangement ensures that the rotating guide sleeve 513 is stably positioned on the first bearing 512, and the proximity sensor determines the initial position of the spline needle rod 44 by sensing the sensing block, thereby facilitating automated rotational adjustment of the spline needle rod 44.

[0061] In the second spline shaft assembly 52, a retaining ring is clamped on the top of the presser foot rod rotating sleeve 522, which abuts the top of the second bearing 521. The bottom of the presser foot rod rotating sleeve 522 has a second step portion, which abuts the bottom of the second bearing 521. The advantage of this arrangement is that it ensures that the presser foot rod rotating sleeve 522 is stably placed on the first bearing 512.

[0062] The working principle of a sewing machine in which the needle bar and the presser foot bar can rotate synchronously according to an embodiment of the present invention is as follows:

[0063] S1: When the needle bar and presser foot do not need to rotate synchronously,

[0064] The first rotary drive motor 41 of the present invention drives the first rotating shaft assembly 42 to rotate, and the first rotating shaft assembly 42 drives the crank assembly 43 to rotate. The crank assembly 43 drives the spline needle bar 44 to rise or fall along the axis direction of the first spline shaft assembly 51 and the second spline shaft assembly 52, thereby realizing the sewing operation of the needle bar;

[0065] The presser foot bar lifting assembly 61 provided in the present invention is used to realize the presser foot bar lifting seat 62 to rise or fall, thereby realizing the operation of the presser foot bar assembly 63 rising or falling to reciprocate and press the material;

[0066] S2: When the needle bar and presser foot need to be rotated synchronously,

[0067] The first rotation drive assembly 50 provided in the present invention is used to drive the first spline shaft assembly 51 to rotate, and the first spline shaft assembly 51 drives the spline needle rod 44 to rotate.

[0068] When the spline needle rod 44 rotates, it drives the second spline shaft assembly 52 to rotate, and the rotation of the second spline shaft assembly 52 drives the presser foot rod assembly 63 to rotate.

[0069] Thereby achieving synchronous rotation of the needle bar and the presser foot bar.

[0070] The sewing machine in which the needle bar and the presser foot bar can rotate synchronously according to the embodiment of the present invention has the following advantages:

[0071] Firstly, it is used to realize synchronous rotation of the needle bar and the presser foot bar, thereby facilitating the user to synchronously rotate the needle bar and the presser foot bar, thereby improving sewing efficiency;

[0072] Secondly, through the structural characteristics of the sewing machine, the first rotary drive assembly 50, the first spline shaft assembly 51 and the second spline shaft assembly 52 are used to cooperate to achieve synchronous rotation of the needle bar and the presser foot bar. This structural setting produces an unexpected technical effect: that is, in a complex sewing machine structure, the spatial layout is greatly reduced, making the sewing machine structure more compact, and making the sewing machine easy to disassemble and repair, and reducing manufacturing costs. This structural setting is very popular in the sewing machine market, and facilitates the subsequent realization of sewing machine automation or facilitates the subsequent sewing machine to add structure and add new functions.

[0073] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A sewing machine in which a needle bar and a presser foot bar can rotate synchronously, comprising a sewing machine table (1), a table plate (2) mounted on the sewing machine table (1), and a sewing machine head (3) mounted on one side of the table plate (2) and matched with the table plate (2), characterized in that: A first rotary drive motor (41) is installed inside the sewing machine head (3), the first rotary drive motor (41) is connected to a first rotating shaft assembly (42), one end of the first rotating shaft assembly (42) is connected to a crank assembly (43), the crank assembly (43) is connected to a spline needle rod (44), the crank assembly (43) is used to drive the spline needle rod (44) to reciprocate and rise and fall, a first spline shaft assembly (51) is sleeved on the spline needle rod (44), a first rotary drive assembly (50) is installed on one side of the first spline shaft assembly (51), and the first rotary drive assembly (50) is connected to the first rotating shaft assembly (42). The assembly (50) is used to drive the first spline shaft assembly (51) to reciprocate, a presser bar lifting assembly (61) is arranged on one side of the first rotating shaft assembly (42), a presser bar lifting seat (62) is arranged at the bottom of the presser bar lifting assembly (61), a second spline shaft assembly (52) is arranged on the presser bar lifting seat (62), a presser bar assembly (63) is arranged at the bottom of the second spline shaft assembly (52), the spline needle bar (44) is sleeved on the second spline shaft assembly (52), and the spline needle bar (44), the presser bar assembly (63) and the table (2) cooperate to perform sewing operations.

2. A sewing machine with a needle bar and a presser foot bar that can rotate synchronously according to claim 1, characterized in that: The first rotating shaft assembly (42) comprises a first coupling (421) sleeved on the output shaft of the first rotating drive motor (41) and a first rotating shaft (422) sleeved on the first coupling (421), and the crank assembly (43) is mounted on one end of the first rotating shaft (422).

3. A sewing machine with a needle bar and a presser foot bar that can rotate synchronously according to claim 1 or 2, characterized in that: The crank assembly (43) comprises a crank block (431), a crank rod (432) hinged at an eccentric position of the crank block (431), a lifting rod sleeve (433) sleeved on a spline needle rod (44) and hinged to one end of the crank rod (432), and a clamping rod sleeve (434) mounted on both ends of the lifting rod sleeve (433) and sleeved on the spline needle rod (44).

4. A sewing machine with a needle bar and a presser foot bar that can rotate synchronously according to claim 1, characterized in that: The first spline shaft assembly (51) comprises a mounting sleeve (511) mounted inside the sewing machine head (3), a first bearing (512) mounted inside the mounting sleeve (511), a rotating guide sleeve (513) rotatably connected to the inner ring of the first bearing (512), and a first spline nut (514) mounted inside the rotating guide sleeve (513); the spline needle rod (44) is inserted into the first spline nut (514).

5. A sewing machine with a needle bar and a presser foot bar that can rotate synchronously according to claim 1, characterized in that: The first rotary drive assembly (50) comprises a second rotary drive motor (500) mounted on the sewing machine head (3) and mounted on one side of the first spline shaft assembly (51), a first bevel gear (501) sleeved on the output shaft of the second rotary drive motor (500), and a second bevel gear (502) meshing with the first bevel gear (501); the second bevel gear (502) is sleeved on the first spline shaft assembly (51); and the second rotary drive motor (500) can be used to drive the first spline shaft assembly (51) to reciprocate.

6. A sewing machine with a needle bar and a presser foot bar that can rotate synchronously according to claim 1, characterized in that: The presser bar lifting assembly (61) comprises a first lifting assembly (611), a second lifting assembly (612) and a lifting rod (613) respectively connected to the first lifting assembly (611) and the second lifting assembly (612); the presser bar lifting seat (62) is installed at the bottom of the lifting rod (613); guide rods (614) are installed on both sides of the presser bar lifting seat (62); the guide rods (614) are slidably connected to the inside of the sewing machine head (3); the first lifting assembly (611) comprises a third rotary drive motor (6111) installed in the sewing machine head (3); an angle transmission assembly (6112) installed on the output shaft of the third rotary drive motor (6111); a second rotating shaft (6113) installed on the angle transmission assembly (6112); a first rotating block (6114) installed at one end of the second rotating shaft (6113); and a first rotating block (6114) installed at the first rotating block (6114). ) and a first lifting transmission block (6115) mounted on the first lifting transmission block (6115), the lifting rod (613) is inserted on the first lifting guide block (6116), the lifting rod (613) is sleeved with a reset spring (615), the first lifting block is located at the bottom or below the reset spring (615), the second lifting assembly (612) comprises a synchronous swing connecting plate (6121) drivingly connected to the first rotating shaft assembly (42), a swing slot block (6122) matched with the swing rod of the synchronous swing connecting plate (6121), a first connecting rod (6123) mounted on the swing slot block (6122), and a second connecting rod (6124) mounted between one end of the first connecting rod (6123) and the first lifting transmission block (6115), the second connecting rod (6124) is connected to the first lifting transmission block (6115).

7. A sewing machine with a needle bar and a presser foot bar that can rotate synchronously according to claim 1, characterized in that: The second spline shaft assembly (52) comprises a second bearing (521) mounted on a presser bar lifting seat (62), a presser bar rotating sleeve (522) mounted on the inner ring of the second bearing (521), a second spline nut (523) mounted inside the presser bar rotating sleeve (522), and a clamping plate (524) mounted on the top of the second bearing (521); the spline needle bar (44) is inserted on the second spline nut (523); the presser bar assembly (63) comprises a presser bar connecting frame (631) mounted on the bottom of the presser bar rotating sleeve (522) and a presser foot (632) mounted on the presser bar connecting frame (631); the presser foot (632) is for the sewing machine needle at the bottom of the spline needle bar (44) to pass through.

8. A sewing machine with a needle bar and a presser foot bar that can rotate synchronously according to claim 1, characterized in that: It also comprises a thread shifting assembly (45) which is mounted on the sewing machine head (3) and matches with the sewing machine needle at the bottom of the spline needle rod (44).

9. A sewing machine with a needle bar and a presser foot bar that can rotate synchronously according to claim 1, characterized in that: The sewing machine head (3) also includes a machine head shell (30).

10. A sewing machine with a needle bar and a presser foot bar that can rotate synchronously according to claim 1, characterized in that: A movable needle plate (21) is mounted on the table (2), a small needle plate (22) matched with a spline needle rod (44) is mounted on the movable needle plate (21), and a shuttle bed mechanism matched with the spline needle rod (44) is mounted at the bottom of the movable needle plate (21).

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