Driving structure of sewing machine

Abstract

The utility model discloses a driving structure of a sewing machine. The driving structure comprises a fixed seat (1), a movable seat (2), a machine needle (3), a feeding tooth seat (4) and a driving assembly (7), the device is characterized in that the driving assembly (7) comprises a first main shaft (72); the first driven wheel (73) is coaxially connected to the first main shaft (72) and is provided with a transmission shaft (731) which is eccentrically arranged, and the transmission shaft (731) is inserted into the transmission groove (222) of the movable seat (2); the second main shaft (74) is coaxially connected to the first main shaft (72); the second driven wheel (75) is eccentrically connected to the second main shaft (74) and is inserted into a transmission hole (42) of the feeding tooth seat (4); and a power output shaft of the driving source (71) is in transmission connection with the first driven wheel (73). Compared with the prior art, the device is simple and compact in structure.

Description

Technical Field

[0001] The utility model relates to the technical field of sewing machines, and specifically refers to a driving structure of a sewing machine. Background Art

[0002] A handheld sewing machine, also known as a mini sewing machine or a micro sewing machine, is a scaled-down version of an industrial sewing machine. The handheld sewing machine has a beautiful appearance and a small volume; although its volume is greatly reduced, compared with ordinary household sewing machines, its basic functions are retained, and accessories such as sewing needles and spools are universal with traditional desktop sewing machines, and different colors of threads can be replaced and used at any time according to one's own needs.

[0003] During the sewing process, the driving mechanism drives the sewing needle, the feed dog and the hook to move respectively and cooperate to achieve the sewing action. For details, reference can be made to the Chinese patent "A Handheld Double-thread Sewing Machine" with the patent application number CN201910284924.1.

[0004] However, in the above solution, the driving mechanism of the sewing machine has a complex structure and a large volume, which is not convenient for carrying and transportation. Summary of the Utility Model

[0005] The technical problem to be solved by the utility model is to provide a compact driving structure of a sewing machine in view of the current situation of the prior art.

[0006] The technical solution adopted by the utility model to solve the above technical problem is: a driving structure of a sewing machine, including a fixed seat;

[0007] A movable seat, which is movably installed on the fixed seat;

[0008] A sewing needle, which is fixed relative to the movable seat;

[0009] A feed dog seat, the top of which is provided with a feed dog; and

[0010] A driving component, which is used to drive the movable seat and the feed dog seat to move relative to the fixed seat;

[0011] It is characterized in that: the movable seat is provided with a transmission groove extending in the front-rear direction, the rear part of the feed dog seat is limited on the fixed seat so as to be able to slide and rotate back and forth, and the feed dog seat is provided with a circular transmission hole;

[0012] The driving component includes

[0013] A first main shaft, which extends in the left-right direction and is rotatably connected to the fixed seat;

[0014] A first driven wheel, which is coaxially connected to the first main shaft, and the surface thereof is provided with a transmission shaft arranged eccentrically, and the transmission shaft can be inserted into the transmission groove so as to be able to rotate and slide back and forth;

[0015] a second main shaft, coaxially connected to the first main shaft;

[0016] a second driven wheel, eccentrically connected to the second main shaft and rotatably inserted into the transmission hole; and

[0017] The driving source has a power output shaft which is in transmission connection with the first driven wheel so as to make the first driven wheel rotate around its own axis.

[0018] In order to facilitate the installation of the machine needle, the movable seat includes a horizontal bar, a vertical bar and a needle shaft. The vertical bar is connected to the right end of the horizontal bar, the needle shaft is vertically arranged at the left end of the horizontal bar, and the machine needle is installed at the bottom of the needle shaft.

[0019] In order to enable the movable seat to be movable up and down and limited on the fixed seat, a clearance groove extending in the vertical direction is provided on the top of the fixed seat, and the horizontal bar can be inserted into the clearance groove for movable up and down, and guide grooves are provided on the side walls on the front and rear sides of the horizontal bar to cooperate with the edge guides on the front and rear sides of the clearance groove.

[0020] In order to enable the movable seat to be movable up and down and limited on the fixed seat, the fixed seat has a first guide column, and the vertical bar has a first waist-shaped hole extending in the vertical direction and for the first guide column to be inserted.

[0021] In order to prevent the first guide column from being separated from the first waist-shaped hole, the end of the first guide column is provided with a first limiting head which is limited to the outside of the vertical bar.

[0022] In order to enable the rear part of the feed dog seat to slide back and forth and be rotatably limited on the fixed seat, the fixed seat has a second guide column, and the rear part of the feed dog seat has a second waist-shaped hole extending along the front-to-back direction and for the second guide column to be inserted.

[0023] In order to prevent the second guide column from being separated from the second waist-shaped hole, the end of the second guide column is provided with a second limiting head which is limited to the outside of the feeding tooth seat.

[0024] In order to realize the hook line action, it also includes

[0025] A swing arm, the bottom end of which is rotatably connected to the fixed base via a rotating shaft and can move relative to the fixed base under the action of the driving assembly; and

[0026] The machine hook is fixed relative to the swing arm.

[0027] In order to simplify the structure of the driving assembly, the swing arm is provided with a first limiting post and a second limiting post arranged at intervals;

[0028] The described driving component further includes a cam, which is connected to the second main shaft and has a cam groove on its surface;

[0029] The first limiting post is limited outside the cam, and the second limiting post is limited in the cam groove.

[0030] To facilitate the user to manually control the operation of the sewing machine, the first driven wheel is a gear, and an output gear is coaxially arranged at the power output shaft of the driving source;

[0031] The described driving component further includes

[0032] a driven gear, rotatably connected to the fixed seat and meshing with the first driven wheel;

[0033] a handwheel, rotatably connected to the fixed seat, coaxially connected to the driven gear, the handwheel is a gear and meshes with the output gear.

[0034] Compared with the prior art, the advantages of the present utility model are as follows: A driving component is composed of a first main shaft, a first driven wheel, a second main shaft, a second driven wheel and a driving source. Driving the entire movable seat will drive the sewing needle to make a reciprocating up and down movement to realize threading. At the same time, driving the entire feed dog seat to make a compound movement of a reciprocating back and forth movement and an up and down swinging movement to realize feeding. The driving structure of this sewing machine is compact, small in size and reliable in operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a three-dimensional structural schematic diagram of an embodiment of the driving structure of the sewing machine of the present utility model;

[0036] Figure 2 is Figure 1 a longitudinal sectional view of;

[0037] Figure 3 is Figure 1 a transverse sectional view of;

[0038] Figure 4 is Figure 1 a three-dimensional exploded schematic diagram of;

[0039] Figure 5 is Figure 4 a three-dimensional structural schematic diagram of the feed dog seat in;

[0040] Figure 6 is Figure 4 a three-dimensional structural schematic diagram of the swing arm and the hook in;

[0041] Figure 7 is Figure 4 a three-dimensional structural schematic diagram of the driving component in. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The following further describes the present utility model in detail in conjunction with the embodiments and the attached drawings.

[0043] In the description and claims of the present utility model, terms indicating directions are used, such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom", etc., to describe various exemplary structural parts and elements of the present utility model. However, these terms are used herein only for the purpose of convenience of description and are determined based on the exemplary orientations shown in the drawings. Since the embodiments disclosed by the present utility model can be arranged in different directions, these terms indicating directions should be regarded only as illustrative and not as limiting. For example, "upper" and "lower" are not necessarily limited to the directions opposite to or consistent with the direction of gravity.

[0044] As Figures 1 to 7 shown, it is a preferred embodiment of the sewing machine drive structure of the present utility model. The sewing machine drive structure includes a fixed seat 1, a movable seat 2, a sewing needle 3, a feed dog seat 4, a swing arm 5, a hook 6, and a drive assembly 7.

[0045] Among them, a relief groove 11 extending in the vertical direction is formed at the top of the middle part of the fixed seat 1; a first guide post 12 extending in the left-right direction is provided in the middle part of the fixed seat 1; a second guide post 13 extending in the left-right direction is provided at the left part of the fixed seat 1.

[0046] The movable seat 2 is located on the top side of the fixed seat 1 and includes a cross bar 21, a vertical bar 22, and a needle shaft 23. The top end of the vertical bar 22 is connected to the right end of the cross bar 21, and the needle shaft 23 is vertically arranged at the left end of the cross bar 21. In this embodiment, the cross bar 21, the vertical bar 22, and the needle shaft 23 are integrally formed. Specifically, the cross bar 21 is inserted into the above-mentioned relief groove 11 in a vertically movable manner, and guide grooves 211 for guiding and cooperating with the front and rear edges of the relief groove 11 are formed on the side walls of the front and rear sides of the cross bar 21; a first waist-shaped hole 221 extending in the vertical direction and for inserting the first guide post 12 is formed in the middle part of the vertical bar 22, and a first limit head 121 is provided at the right end of the first guide post 12 and is limited to the right side of the vertical bar 22, so that the movable seat 2 is vertically movably limited on the fixed seat 1. In addition, a transmission groove 222 extending in the front-rear direction is formed at the lower part of the vertical bar 22.

[0047] The sewing needle 3 extends in the vertical direction and is installed at the bottom of the above-mentioned needle shaft 23.

[0048] The feed dog base 4 is located on the left side of the fixed base 1 and directly below the sewing needle 3. Specifically, the top of the feed dog base 4 has a feed dog 41; a circular drive hole 42 is provided in the front part of the feed dog base 4; the rear part of the feed dog base 4 has a second waist-shaped hole 43 extending in the front-rear direction for inserting the second guide post 13, and the end of the second guide post 13 has a second limit head 131 limited to the left side of the feed dog base 4, so that the rear part of the feed dog base 4 can slide back and forth and be rotationally limited on the fixed base 1.

[0049] The swing arm 5 is located on the left side of the fixed base 1 and directly below the feed dog base 4. Specifically, the bottom end of the swing arm 5 is rotatably connected to the fixed base 1 through a rotating shaft 51; first limit posts 52 and second limit posts 53 are convexly arranged at intervals on the surface of the right side of the swing arm 5.

[0050] The hook 6 is installed on the surface of the left side of the swing arm 5.

[0051] The driving assembly 7 is used to drive the movable base 2, the feed dog base 4 and the swing arm 5 to move relative to the fixed base 1. In this embodiment, the driving assembly 7 includes a driving source 71, a first main shaft 72, a first driven wheel 73, a second main shaft 74, a second driven wheel 75, a cam 76, a driven gear 77 and a hand wheel 78. Specifically, the driving source 71 is a motor, installed in the right part of the fixed base 1, and an output gear 711 is coaxially arranged at the end of its power output shaft; the first main shaft 72 extends in the left-right direction and is rotatably connected to the middle left part of the fixed base 1; the first driven wheel 73 is a gear, coaxially connected to the right end of the first main shaft 72, and a transmission shaft 731 that is eccentrically arranged and extends in the left-right direction is convexly arranged on the surface of its right side, and this transmission shaft 731 can rotate and slide back and forth and is inserted into the above-mentioned transmission groove 222; the second main shaft 74 is coaxially connected inside the first main shaft 72 and its left end is exposed; the second driven wheel 75 is eccentrically connected to the left end of the second main shaft 74 and can rotate and is inserted into the above-mentioned drive hole 42; the cam 76 is connected to the left end of the second main shaft 74 and is located on the left side of the second driven wheel 75, and a cam groove 761 is provided on the surface of its left side, the above-mentioned first limit post 52 is limited to the outside of the cam 76, and the second limit post 53 is limited to the cam groove 761; the driven gear 77 is rotatably connected to the front side of the middle part of the fixed base 1 and meshes with the above-mentioned first driven wheel 73; the hand wheel 78 is rotatably connected to the front side of the right part of the fixed base 1 and is coaxially connected to the above-mentioned driven gear 77 through a connecting rod. In this embodiment, the hand wheel 78 is a gear and meshes with the above-mentioned output gear 711. In this embodiment, the first main shaft 72 and the first driven wheel 73 are an integral part, and the second main shaft 74, the second driven wheel 75 and the cam 76 are an integral part.

[0052] The working principle of this embodiment is as follows:

[0053] (1) During operation, start the drive source 71, and drive the output gear 711 to rotate through the power output shaft. Since the handwheel 78 meshes with the output gear 711, the handwheel 78 drives the driven gear 77 to rotate synchronously; since the driven gear 77 meshes with the first driven wheel 73, the first driven wheel 73 rotates accordingly; since the transmission shaft 731 is inserted into the transmission slot 222 so as to be rotatable and slidable back and forth, and the movable seat 2 is limited on the fixed seat 1 so as to be movable up and down, therefore, during the rotation of the transmission shaft 731, the entire movable seat 2 drives the sewing needle 3 to reciprocate up and down to achieve threading; at the same time, the first driven wheel 73 drives the second driven wheel 75 and the cam 76 to rotate synchronously through the first main shaft 72 and the second main shaft 74. On the one hand, since the second driven wheel 75 is eccentrically arranged and is inserted into the transmission hole 42 so as to be rotatable, and the rear part of the feed dog seat 4 is limited on the fixed seat 1 so as to be slidable back and forth and rotatable, therefore, during the rotation of the second driven wheel 75, the entire feed dog seat 4 makes a combined movement of reciprocating back and forth and swinging up and down to achieve feeding. On the other hand, since the first limiting post 52 is limited outside the cam 76, the second limiting post 53 is limited in the cam groove 761, and the bottom end of the swing arm 5 is rotatably connected to the fixed seat 1, therefore, during the rotation of the cam 76, the entire swing arm 5 drives the hook 6 to swing back and forth to achieve thread hooking.

[0054] (2) When it is necessary to cut off the power or stop the operation of the sewing machine during operation, the handwheel 78 can be rotated to drive the driven gear 77 to rotate synchronously. Since the driven gear 77 meshes with the first driven wheel 73, the first driven wheel 73 rotates accordingly, and finally drives the sewing needle 3, the feed dog seat 4 and the hook 6 to perform the above movements. The handwheel 78 can help the user slowly control the operation of the sewing machine to avoid accidental sewing mistakes.

Claims

1. A sewing machine drive structure, comprising a fixed seat (1); a movable seat (2), which is mounted on the fixed seat (1) so as to be movable up and down; a sewing needle (3), which is fixed relative to the movable seat (2); a feed dog seat (4), the top of which is provided with a feed dog (41); and a drive assembly (7), which is used to drive the movable seat (2) and the feed dog seat (4) to move relative to the fixed seat (1); It is characterized in that: a transmission groove (222) extending in the front-rear direction is provided on the movable seat (2), the rear part of the feed dog seat (4) is limited on the fixed seat (1) so as to be slidable and rotatable back and forth, and a circular transmission hole (42) is provided on the feed dog seat (4); The drive assembly (7) includes a first main shaft (72), which extends in the left-right direction and is rotatably connected to the fixed seat (1); a first driven wheel (73), which is coaxially connected to the first main shaft (72), and a transmission shaft (731) eccentrically arranged on the surface, and the transmission shaft (731) is inserted into the transmission groove (222) so as to be rotatable and slidable back and forth; a second main shaft (74), which is coaxially connected to the first main shaft (72); a second driven wheel (75), which is eccentrically connected to the second main shaft (74) and is rotatably inserted into the transmission hole (42); and a drive source (71), the power output shaft of which is in transmission connection with the first driven wheel (73) so as to make the first driven wheel (73) rotate around its own axis.

2. The sewing machine drive structure according to claim 1, characterized in that: The movable seat (2) includes a cross bar (21), a vertical bar (22) and a needle shaft (23), the vertical bar (22) is connected to the right end of the cross bar (21), the needle shaft (23) is vertically arranged at the left end of the cross bar (21), and the sewing needle (3) is installed at the bottom of the needle shaft (23).

3. The sewing machine drive structure according to claim 2, characterized in that: A relief groove (11) extending in the vertical direction is provided at the top of the fixed seat (1), the cross bar (21) is inserted into the relief groove (11) so as to be movable up and down, and guide grooves (211) for guiding and cooperating with the front and rear edges of the relief groove (11) are provided on the side walls on the front and rear sides of the cross bar (21).

4. The sewing machine drive structure according to claim 2, characterized in that: A first guide post (12) is provided on the fixed seat (1), and a first waist-shaped hole (221) extending in the vertical direction and for inserting the first guide post (12) is provided on the vertical bar (22).

5. The sewing machine drive structure according to claim 4, characterized in that: A first limit head (121) is provided at the end of the first guide post (12) and is limited outside the vertical bar (22).

6. The sewing machine drive structure according to claim 1, characterized in that: A second guide post (13) is provided on the fixed seat (1), and a second waist-shaped hole (43) extending in the front-rear direction and for inserting the second guide post (13) is provided at the rear part of the feed dog seat (4).

7. The sewing machine drive structure according to claim 6, characterized in that: A second limit head (131) is provided at the end of the second guide post (13) and is limited outside the feed dog seat (4).

8. The sewing machine drive structure according to claim 1, characterized in that: It further includes a swing arm (5), the bottom end of which is rotatably connected to the fixed seat (1) through a rotating shaft (51) and can move relative to the fixed seat (1) under the action of the drive assembly (7); and a hook (6), which is fixed relative to the swing arm (5).

9. The sewing machine drive structure according to claim 8, characterized in that: The swing arm (5) is provided with a first limit post (52) and a second limit post (53) arranged at intervals; The driving assembly (7) further includes a cam (76), which is connected to the second main shaft (74), and a cam groove (761) is formed on the surface thereof; The first limit post (52) is limited to the outside of the cam (76), and the second limit post (53) is limited to the cam groove (761).

10. The sewing machine drive structure according to any one of claims 1 to 9, characterized in that: The first driven wheel (73) is a gear, and an output gear (711) is coaxially arranged at the power output shaft of the driving source (71); The driving assembly (7) further includes a driven gear (77), which is rotatably connected to the fixed seat (1) and meshes with the first driven wheel (73); a hand wheel (78), which is rotatably connected to the fixed seat (1), is coaxially connected to the driven gear (77), the hand wheel (78) is a gear, and meshes with the output gear (711).

Images