Synchronous rotation structure for needle bar and presser foot bar of sewing machine

Abstract

The needle bar and presser foot bar synchronous rotation structure of the sewing machine comprises a needle bar lifting mechanism and a presser foot bar lifting mechanism arranged on one side of the needle bar lifting mechanism, the needle bar lifting mechanism is connected with a needle bar in a lifting driving mode, the presser foot bar lifting mechanism is connected with a presser foot bar lifting plate in a lifting driving mode, and the needle bar is provided with a spline protrusion. The needle rod is provided with a first rotating assembly matched with the spline protrusion, one side of the needle rod is provided with a first rotating driving motor, the first rotating driving motor is in rotating driving connection with a first bevel gear, the first bevel gear is in meshed connection with a second bevel gear, and the second bevel gear is arranged on the first rotating assembly in a sleeving mode; a second rotating component matched with the spline bulge is arranged on the needle bar, the second rotating component is arranged on a presser foot bar lifting plate, and a presser foot bar component is arranged on the presser foot bar lifting plate; according to the needle bar and presser foot bar synchronous rotation structure of the sewing machine, a user can conveniently and synchronously rotate the needle bar and the presser foot bar, and therefore the best sewing effect is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of needle bar and presser bar rotating structure of sewing machine, particularly relates to a needle bar and presser bar synchronous rotating structure of sewing machine. BACKGROUND

[0002] The presser bar and needle bar are conventional necessary components of the sewing machine, and the functions of the presser bar and needle bar are respectively as follows during the sewing process: when the material is sewn, the presser bar presses the material, the needle bar goes down, the bottom of the needle bar is provided with a needle, the needle passes through the presser bar and cooperates with the shuttle structure of the sewing machine to perform sewing, then the needle rises, the presser bar releases the material, the material is moved through the feed dog of the sewing machine, and then the sewing is repeatedly performed.

[0003] However, the current sewing machine has a disadvantage that, in the sewing process or other sewing scenes, the rotation direction of the needle of the needle bar needs to be temporarily adjusted to adjust the thread tension direction and effect of the sewing thread, so as to improve the sewing quality, and the rotation direction of the needle of the needle bar must be adjusted first, then the rotation direction of the presser bar is adjusted, and finally the rotation direction of the needle bar and the presser bar can be adjusted.

[0004] However, the structure of the needle bar and the presser bar causes the needle bar and the presser bar to be inconvenient to adjust the angle, and the consistency of the angle cannot be guaranteed, so that the sewing effect cannot be improved. UTILITY MODEL CONTENTS

[0005] The utility model aims at overcoming the above-mentioned defects in the prior art, and provides a needle bar and presser bar synchronous rotating structure of sewing machine, which is convenient for the user to synchronously rotate the needle bar and the presser bar, is convenient to operate, and can obtain the best sewing effect.

[0006] In order to achieve the above-mentioned purpose, the utility model provides a needle bar and presser bar synchronous rotating structure of sewing machine, which comprises a needle bar lifting mechanism and a presser bar lifting mechanism arranged on one side of the needle bar lifting mechanism, a needle bar is drivingly connected to the needle bar lifting mechanism, a presser bar lifting plate is drivingly connected to the presser bar lifting mechanism, a spline protrusion is arranged on the needle bar, a first rotating component matched with the spline protrusion is arranged on the needle bar, a first rotating drive motor is arranged on one side of the needle bar, the first rotating drive motor is drivingly connected with a first bevel gear, the first bevel gear is meshingly connected with a second bevel gear, the second bevel gear is sleeved on the first rotating component, a second rotating component matched with the spline protrusion is arranged on the needle bar, the second rotating component is arranged on the presser bar lifting plate, and a presser bar assembly is arranged on the presser bar lifting plate.

[0007] As preferred, the needle bar bottom is provided with a machine needle, and the presser bar assembly is used for allowing the machine needle to pass through.

[0008] As preferred, the first rotating assembly comprises a fixed bearing seat, a first bearing arranged in the fixed bearing seat, a needle bar rotating guide sleeve sleeved on the inner ring of the first bearing, and a first spline nut arranged in the needle bar rotating guide sleeve, the first spline nut being sleeved on the needle bar and matched with the spline protrusion of the needle bar, and the second bevel gear is sleeved on the needle bar rotating guide sleeve.

[0009] As preferred, the needle bar rotating guide sleeve top has a first step portion abutting against the first bearing top, and the needle bar rotating guide sleeve bottom has a pressing sleeve abutting against the first bearing bottom.

[0010] As preferred, the pressing sleeve one end is provided with a sensing block, and the sensing block one side is provided with a proximity sensor.

[0011] As preferred, the presser bar lifting plate and the second rotating assembly are located below the first rotating assembly.

[0012] As preferred, the presser bar lifting plate is provided with a placing groove, and the second rotating assembly is arranged on the placing groove.

[0013] As preferred, the second rotating assembly comprises a second bearing arranged on the placing groove, a pressing cover arranged on the second bearing top, a presser bar rotating guide sleeve sleeved on the inner ring of the second bearing, and a second spline nut arranged in the presser bar rotating guide sleeve, the second spline nut being sleeved on the needle bar and matched with the spline protrusion of the needle bar.

[0014] As preferred, the presser bar rotating guide sleeve top is clamped with a stop ring abutting against the second bearing top, and the presser bar rotating guide sleeve bottom has a second step portion abutting against the second bearing bottom.

[0015] As preferred, the presser bar assembly comprises a connecting frame arranged on the second rotating assembly bottom and a presser bar arranged on the connecting frame bottom.

[0016] Compared with the prior art, the utility model has the beneficial effects that:

[0017] 1. The needle bar lifting mechanism is arranged for driving the needle bar to reciprocatingly lift, thereby being used for reciprocatingly sewing the material, and the presser bar lifting mechanism is arranged for driving the presser bar to reciprocatingly lift, thereby being used for reciprocatingly pressing the material.

[0018] In addition, when the needle bar and the presser bar need to be synchronously rotated and adjusted, the first rotary drive motor drives the first bevel gear to rotate, the first bevel gear drives the second bevel gear to rotate, the second bevel gear drives the first rotating assembly to rotate, the first rotating assembly drives the needle bar to rotate through cooperation with the spline protrusion, the needle bar drives the second rotating assembly to rotate, and the second rotating assembly drives the presser bar assembly to rotate, so that the needle bar and the presser bar are synchronously rotated and adjusted.

[0019] 2. In summary, the needle bar and the presser bar synchronous rotating structure of the sewing machine provided by the utility model is used for realizing synchronous rotation of the needle bar and the presser bar, so as to adjust the thread tensioning direction of the needle of the needle bar, to adapt to better sewing directions and sewing scenes, and to obtain better sewing quality. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description. Obviously, the drawings in the following description are some embodiments of the utility model, and other drawings can also be obtained by those skilled in the art without creative labor.

[0021] Figure 1 It is a structure schematic view of the needle bar and the presser bar synchronous rotating structure of the sewing machine provided by the embodiment of the utility model;

[0022] Figure 2 It is a front view schematic view of the needle bar and the presser bar synchronous rotating structure of the sewing machine provided by the embodiment of the utility model;

[0023] Figure 3 It is a structure schematic view of the needle bar and the presser bar synchronous rotating structure of the sewing machine provided by the embodiment of the utility model, which omits the needle bar lifting mechanism and the presser bar lifting mechanism;

[0024] Figure 4 It is a front view schematic view of the needle bar and the presser bar synchronous rotating structure of the sewing machine provided by the embodiment of the utility model, which omits the needle bar lifting mechanism and the presser bar lifting mechanism;

[0025] Figure 5 It is an exploded structure schematic view of the needle bar and the presser bar synchronous rotating structure of the sewing machine provided by the embodiment of the utility model, which omits the needle bar lifting mechanism and the presser bar lifting mechanism.

[0026] In the drawings, there are:

[0027] 1, needle bar lifting mechanism; 2, presser bar lifting mechanism; 3, needle bar; 30, spline protrusion; 4, first rotating assembly; 411, fixed bearing seat; 412, first bearing; 413, needle bar rotating guide sleeve; 4131, first step portion; 414, first spline nut; 415, compression sleeve; 416, sensing block; 417, proximity sensor; 51, first rotary drive motor; 52, first bevel gear; 53, second bevel gear; 6, second rotating assembly; 61, second bearing; 62, compression cover; 63, presser bar rotating guide sleeve; 631, retaining ring; 632, second step portion; 64, second spline nut; 7, presser bar lifting plate; 70, placing groove; 71, lifting rod; 8, presser bar assembly; 81, connecting frame; 82, presser bar. DETAILED DESCRIPTION

[0028] The technical scheme in the embodiment of the utility model will be described clearly and completely below in combination with the drawings in the embodiment of the utility model. Obviously, the described embodiment is one of the embodiments of the utility model, rather than all the embodiments of the utility model. Based on the embodiment in the utility model, all other embodiments obtained by the person skilled in the art without creative labor fall within the scope of protection of the utility model.

[0029] Please refer to Figures 1 to 5 The embodiment of the utility model provides a needle bar and presser bar synchronous rotating structure of sewing machine, including needle bar lifting mechanism 1 and the presser bar lifting mechanism 2 of installing in needle bar lifting mechanism 1 one side, needle bar lifting mechanism 1 is driven and connected with needle bar 3 on the lifting, presser bar lifting mechanism 2 is driven and connected with presser bar lifting plate 7 on the lifting, needle bar 3 is equipped with spline protrusion 30, needle bar 3 is equipped with the first rotating assembly 4 that cooperates with spline protrusion 30 and installs, needle bar 3 one side installs first rotary drive motor 51 (this first rotary drive motor 51 is fixedly installed on sewing machine), first rotary drive motor 51 is driven and connected with first bevel gear 52 on rotating, first bevel gear 52 is engaged and connected with second bevel gear 53, and second bevel gear 53 is set on first rotating assembly 4, needle bar 3 is equipped with the second rotating assembly 6 that cooperates with spline protrusion 30 and installs, second rotating assembly 6 installs on presser bar lifting plate 7, and presser bar lifting plate 7 is equipped with presser bar assembly 8 and installs.

[0030] In this embodiment, the working principle of the needle bar lifting mechanism 1 is as follows: a servo drive motor drives a rotating shaft, which in turn drives a crank. The needle bar 3 is connected to the crank, which rotates and drives the needle bar 3 to reciprocate up and down for sewing. The working principle of the presser foot lifting mechanism 2 is as follows: a swing linkage is connected to the rotating shaft of the needle bar lifting mechanism 1. The swing linkage is connected to a swing plate with a swing groove. The swing plate is connected to a connecting rod, which is connected to a lifting transmission block. The lifting transmission block is connected to a lifting sleeve, which is fitted with a lifting rod 71. The lifting rod 71 is connected to the presser foot lifting plate 7. When the rotating shaft of the needle bar lifting mechanism 1 rotates, it drives the swing linkage to rotate. The swing linkage moves along the direction of the swing groove and reciprocates against the swing plate, thus the swing plate drives the connecting rod to move up and down. The connecting rod drives the lifting transmission block to move upward, which drives the lifting sleeve to move up and down. The lifting sleeve drives the lifting rod 71 to move up and down, thus the lifting rod 71 drives the presser foot. The presser foot lever lifting plate 7 moves up and down. Furthermore, to prevent the lifting rod 71 of the presser foot lever lifting mechanism 2 from failing to properly drive or press the presser foot lever lifting plate 7, an additional lifting drive mechanism is added: a servo drive motor—angle rotation assembly—rotating shaft—angle rotating block—lifting transmission block are sequentially connected. The purpose of this lifting drive mechanism is that, during the upward movement of the lifting transmission block, the angle rotating block actively causes the lifting transmission block to rotate upward; similarly, during the downward movement of the lifting transmission block, the angle rotating block actively causes the lifting transmission block to rotate downward, thereby causing the presser foot lever lifting plate 7 driven by the lifting rod 71 to move upward or to press the presser foot lever lifting plate 7 more tightly. In other embodiments, the needle bar lifting mechanism 1 and presser foot lever lifting mechanism 2 can be other needle bar lifting mechanisms 1 and presser foot lever lifting mechanisms 2 found in other existing sewing machines, which will not be described further here.

[0031] The needle bar 3 is fitted with a needle (not shown in the attached figure) at its bottom, and the presser foot assembly 8 is used for the needle to pass through.

[0032] The first rotating assembly 4 includes a fixed bearing seat 411 (the fixed bearing is fixedly mounted on the sewing machine), a first bearing 412 installed inside the fixed bearing seat 411, a needle bar rotating guide sleeve 413 sleeved on the inner ring of the first bearing 412, and a first spline nut 414 installed inside the needle bar rotating guide sleeve 413. The first spline nut 414 is sleeved on the needle bar 3 and engages with the spline protrusion 30 of the needle bar 3. The second bevel gear 53 is sleeved on the needle bar rotating guide sleeve 413.

[0033] The needle bar rotating guide sleeve 413 has a first stepped portion 4131 at its top, which abuts against the top of the first bearing 412. The needle bar rotating guide sleeve 413 has a clamping sleeve 415 at its bottom, which abuts against the bottom of the first bearing 412. Through the cooperation of the first stepped portion 4131 and the clamping sleeve 415, the needle bar rotating guide sleeve 413 is securely mounted on the first bearing 412, ensuring that the needle bar rotating guide sleeve 413 can only rotate and cannot move up and down.

[0034] A sensing block 416 protrudes from one end of the clamping sleeve 415, and a proximity sensor 417 is mounted on one side of the sensing block 416. Through the cooperation of the sensing block 416 and the proximity sensor 417, the initial rotation angle of the needle bar 3 and the presser foot bar 82 can be determined, which facilitates subsequent automated angle adjustment and allows the operator to know how much angle has been adjusted.

[0035] The presser foot lifting plate 7 and the second rotating assembly 6 are located below the first rotating assembly 4.

[0036] The presser foot lifting plate 7 has a placement groove 70, and the second rotating component 6 is installed on the placement groove 70.

[0037] The second rotating assembly 6 includes a second bearing 61 mounted on the placement groove 70, a clamping cover 62 mounted on the top of the second bearing 61, a presser foot rod rotating guide sleeve 63 sleeved on the inner ring of the second bearing 61, and a second spline nut 64 mounted inside the presser foot rod rotating guide sleeve 63. The second spline nut 64 is sleeved on the needle bar 3 and cooperates with the spline protrusion 30 of the needle bar 3.

[0038] A retaining ring 631 is snapped onto the top of the presser foot lever rotating guide sleeve 63, and the retaining ring 631 abuts against the top of the second bearing 61. The bottom of the presser foot lever rotating guide sleeve 63 has a second stepped portion 632, which abuts against the bottom of the second bearing 61. Through the cooperation of the retaining ring 631 and the second stepped portion 632, the presser foot lever rotating guide sleeve 63 is securely installed on the second bearing 61, ensuring that the presser foot lever rotating guide sleeve 63 can only rotate and cannot move up and down.

[0039] An embodiment of this utility model provides a synchronous rotation structure for the needle bar and presser foot bar of a sewing machine. The working principle by which the needle bar 3 and presser foot bar 82 can achieve synchronous rotation is as follows:

[0040] S0: When it is not necessary to adjust the angle of the needle bar 3, the needle bar lifting mechanism 1 can drive the needle bar 3 to move up and down along the axis positions of the first rotating assembly 4 and the second rotating assembly 6 respectively, and the needle moves up and down through the sewing hole of the presser foot bar 82 of the presser foot bar assembly 8.

[0041] When it is necessary to adjust the angle of the needle bar 3 to adjust the thread take-up direction of the sewing thread, and at the same time, it is necessary to adjust the angle of the presser foot bar 82 to adapt to the thread take-up direction of the needle of the needle bar 3;

[0042] S1: At this time, the first rotary drive motor 51 drives the first bevel gear 52 to rotate, the first bevel gear 52 drives the second bevel gear 53 to rotate, the second bevel gear 53 drives the needle bar rotating guide sleeve 413 to rotate, the needle bar rotating guide sleeve 413 drives the first spline nut 414 to rotate, the first spline nut 414 cooperates with the spline protrusion 30 of the needle bar 3, thereby driving the needle bar 3 to rotate;

[0043] S2: The rotation of the needle bar 3 will drive the second rotating assembly 6 to rotate. The spline protrusion 30 of the needle bar 3 cooperates with the second spline nut 64, thereby driving the second spline nut 64 to rotate. The rotation of the second spline nut 64 drives the presser foot rod rotating guide sleeve 63 to rotate. The presser foot rod rotating guide sleeve 63 drives the connecting frame 81 of the presser foot rod assembly 8 to rotate. The connecting frame 81 drives the presser foot rod 82 to rotate.

[0044] This invention discloses a synchronous rotation structure for the needle bar and presser foot bar of a sewing machine, which enables the needle bar 3 and presser foot bar 82 to rotate automatically and synchronously. This not only makes operation convenient but also helps sewing workers achieve the best sewing results.

[0045] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A structure for synchronous rotation of the needle bar and presser foot bar of a sewing machine, characterized in that, The device includes a needle bar lifting mechanism (1) and a presser foot lever lifting mechanism (2) mounted on one side of the needle bar lifting mechanism (1). A needle bar (3) is driven to move up and down on the needle bar lifting mechanism (1), and a presser foot lever lifting plate (7) is driven to move up and down on the presser foot lever lifting mechanism (2). A spline protrusion (30) is provided on the needle bar (3), and a first rotating assembly (4) that cooperates with the spline protrusion (30) is mounted on the needle bar (3). A first rotary drive motor is mounted on one side of the needle bar (3). 51), the first rotary drive motor (51) is connected to the first bevel gear (52) for rotation drive, the first bevel gear (52) is meshed with the second bevel gear (53), the second bevel gear (53) is sleeved on the first rotating assembly (4), the needle bar (3) is equipped with the second rotating assembly (6) that cooperates with the spline protrusion (30), the second rotating assembly (6) is installed on the presser foot rod lifting plate (7), and the presser foot rod lifting plate (7) is equipped with the presser foot rod assembly (8).

2. The synchronous rotation structure of the needle bar and presser foot bar of a sewing machine according to claim 1, characterized in that, The needle bar (3) is equipped with a needle at its bottom, and the presser foot assembly (8) is used for the needle to pass through.

3. The synchronous rotation structure of the needle bar and presser foot bar of a sewing machine according to claim 1, characterized in that, The first rotating assembly (4) includes a fixed bearing seat (411), a first bearing (412) installed inside the fixed bearing seat (411), a needle bar rotating guide sleeve (413) sleeved on the inner ring of the first bearing (412), and a first spline nut (414) installed inside the needle bar rotating guide sleeve (413). The first spline nut (414) is sleeved on the needle bar (3) and the first spline nut (414) cooperates with the spline protrusion (30) of the needle bar (3). The second bevel gear (53) is sleeved on the needle bar rotating guide sleeve (413).

4. The synchronous rotation structure of the needle bar and presser foot bar of a sewing machine according to claim 3, characterized in that, The needle bar rotating guide sleeve (413) has a first step portion (4131) at the top, which abuts against the top of the first bearing (412). The needle bar rotating guide sleeve (413) has a clamping sleeve (415) at the bottom, which abuts against the bottom of the first bearing (412).

5. The synchronous rotation structure of the needle bar and presser foot bar of a sewing machine according to claim 4, characterized in that, The clamping sleeve (415) has a protruding sensing block (416) at one end, and a proximity sensor (417) is installed on one side of the sensing block (416).

6. The synchronous rotation structure of the needle bar and presser foot bar of a sewing machine according to claim 1, characterized in that, The presser foot lifting plate (7) and the second rotating assembly (6) are located below the first rotating assembly (4).

7. The synchronous rotation structure of the needle bar and presser foot bar of a sewing machine according to claim 1, characterized in that, The presser foot lifting plate (7) is provided with a placement groove (70), and the second rotating component (6) is installed on the placement groove (70).

8. The synchronous rotation structure of the needle bar and presser foot bar of a sewing machine according to claim 7, characterized in that, The second rotating assembly (6) includes a second bearing (61) mounted on a placement groove (70), a pressure cap (62) mounted on the top of the second bearing (61), a presser foot rod rotating guide sleeve (63) sleeved on the inner ring of the second bearing (61), and a second spline nut (64) mounted inside the presser foot rod rotating guide sleeve (63). The second spline nut (64) is sleeved on the needle bar (3) and the second spline nut (64) cooperates with the spline protrusion (30) of the needle bar (3).

9. The synchronous rotation structure of the needle bar and presser foot bar of a sewing machine according to claim 8, characterized in that, The top of the presser foot rod rotating guide sleeve (63) is fitted with a retaining ring (631), which abuts against the top of the second bearing (61). The bottom of the presser foot rod rotating guide sleeve (63) has a second step portion (632), which abuts against the bottom of the second bearing (61).

10. A synchronous rotation structure for the needle bar and presser foot bar of a sewing machine according to claim 1 or 9, characterized in that, The presser foot rod assembly (8) includes a connecting frame (81) mounted at the bottom of the second rotating assembly (6) and a presser foot rod (82) mounted at the bottom of the connecting frame (81).

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