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 driving source (71); the first driven shaft (72) is coaxially connected with a first driving shaft (711) of the driving source (71); the first driven wheel (73) is coaxially connected to the first driven 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 driven shaft (74) is coaxially connected with a second driving shaft (712) of the driving source (71); and the second driven wheel (75) is eccentrically connected to the second driven shaft (74) and is inserted into the transmission hole (42) of the feeding tooth seat (4). Compared with the prior art, the device is compact in structure.

Description

Technical Field

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

[0002] A handheld sewing machine, also known as a mini or micro sewing machine, is a smaller version of an industrial sewing machine. While attractive and compact, it retains the same basic functions as a regular household sewing machine. The needle, bobbin, and other accessories are compatible with traditional tabletop sewing machines, allowing users to change thread colors as needed.

[0003] During the sewing process, the driving mechanism drives the needle, feed dog and hook to move separately and coordinate to realize the sewing action. For details, please refer to the Chinese patent application number CN201910284924.1 "A Handheld Double-Thread Sewing Machine".

[0004] However, in the above solution, the sewing machine driving mechanism has a complex structure and a large volume, which makes it inconvenient to carry and transport. Utility Model Content

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

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

[0007] A movable seat, which can be movably mounted on the fixed seat up and down;

[0008] The needle is fixed relative to the movable seat;

[0009] A feed dog holder having a feed dog on top; and

[0010] A driving assembly, used for driving the movable seat and the feed dog seat to move relative to the fixed seat;

[0011] The invention is characterized in that: the movable seat has a transmission groove extending in the front-to-back direction, the rear part of the feed tooth seat can slide back and forth and be rotatably limited on the fixed seat, and the feed tooth seat has a circular transmission hole;

[0012] The drive assembly includes

[0013] A driving source is mounted on the fixing base, and has a first driving shaft and a second driving shaft extending in the left-right direction at both ends;

[0014] a first driven shaft, rotatably connected to the fixing seat and coaxially connected to the first driving shaft;

[0015] A first driven wheel is coaxially connected to the first driven shaft and has an eccentrically arranged transmission shaft on its surface. The transmission shaft is inserted into the transmission groove so as to be rotatable and slidable forward and backward;

[0016] A second driven shaft, rotatably connected to the fixing seat and coaxially connected to the second driving shaft; and

[0017] The second driven wheel is eccentrically connected to the second driven shaft and is rotatably inserted into the transmission hole.

[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 assembly further includes a cam, which is connected to the second driven 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 driving shaft and the second driving shaft are coaxially connected, and the first driven wheel is a gear;

[0031] The described driving assembly further includes

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

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

[0034] Compared with the prior art, the advantages of the present utility model are as follows: A driving assembly is composed of a driving source, a first driven shaft, a first driven wheel, a second driven shaft and a second driven wheel. Driving the entire movable seat will drive the sewing needle to make a reciprocating up and down motion to realize threading. At the same time, driving the entire feed dog base to make a compound motion of a reciprocating back and forth motion and an up and down swinging motion to realize feeding. The driving structure of this sewing machine is compact, small in size, reliable in operation, and has balanced force on the double-axis output. 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;

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

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

[0039] Figure 5 is Figure 4 a three-dimensional structural schematic diagram of the feed dog base 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 assembly in. DETAILED DESCRIPTION OF THE INVENTION

[0042] The following further describes the present utility model in detail with reference to the embodiments accompanied by 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 here only for the purpose of convenient explanation 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 are only for illustration and should not be regarded as limitations. 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 driving structure of the sewing machine of the present utility model. The driving structure of the sewing machine 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 driving assembly 7.

[0045] Among them, a vertical through groove 11 extending in the vertical direction is opened 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 an integral part. Specifically, the cross bar 21 is inserted into the above-mentioned through groove 11 in a vertically movable manner, and guide grooves 211 for guiding and cooperating with the front and rear edges of the through groove 11 are opened 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 for inserting the first guide post 12 is opened in the middle part of the vertical bar 22, and a first limiting 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 opened 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 rotate and is limited to 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; the first limit post 52 and the second limit post 53 are convexly provided on the right side surface of the swing arm 5 at intervals.

[0050] The hook 6 is installed on the left side surface 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 driven shaft 72, a first driven wheel 73, a second driven shaft 74, a second driven wheel 75, a cam 76, a driven gear 77 and a handwheel 78. Specifically, the driving source 71 is a double-shaft motor installed in the middle of the fixed base 1. Both ends of the driving source 71 have a first driving shaft 711 and a second driving shaft 712 extending in the left-right direction, and the first driving shaft 711 and the second driving shaft 712 are coaxially connected; the first driven shaft 72 is rotatably connected to the middle of the fixed base 1 and coaxially connected to the right end of the first driving shaft 711; the first driven wheel 73 is a gear coaxially connected to the right end of the first driven shaft 72, and a transmission shaft 731 which is eccentrically arranged and extends in the left-right direction is convexly provided on the right side surface thereof, and the transmission shaft 731 can rotate and slide back and forth and is inserted into the above-mentioned transmission groove 222; the second driven shaft 74 is rotatably connected to the left part of the fixed base 1 and coaxially connected to the left end of the second driving shaft 712; the second driven wheel 75 is eccentrically connected to the middle of the second driven 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 driven shaft 74, and a cam groove 761 is provided on the left side surface thereof. 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 of the fixed base 1 and meshes with the above-mentioned first driven wheel 73; the handwheel 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 first driven shaft 72 and the first driven wheel 73 are an integral part, and the second driven 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, the drive source 71 is started, the first driven shaft 72 is driven to rotate by the first drive shaft 711, and the second driven shaft 74 is driven to rotate by the second drive shaft 712; the first driven wheel 73 rotates synchronously with the first driven shaft 72. Since the transmission shaft 731 can rotate and slide back and forth in the transmission groove 222, and the movable seat 2 is limited to move up and down on the fixed seat 1, during the rotation of the transmission shaft 731, the entire movable seat 2 will drive the sewing needle 3 to make a reciprocating up and down movement to achieve threading; at the same time, the second driven wheel 75 and the cam 76 rotate synchronously with the second driven shaft 74. On the one hand, since the second driven wheel 75 is eccentrically arranged and can rotate and is inserted in the transmission hole 42, and the rear part of the feed dog seat 4 is limited to slide back and forth and rotate on the fixed seat 1, 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 limit post 52 is limited outside the cam 76, the second limit 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, during the rotation of the cam 76, the entire swing arm 5 will drive the hook 6 to make a reciprocating back and forth movement to achieve hooking.

[0054] (2) When it is necessary to cut off the power or stop the operation of the sewing machine during work, 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 make 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 drive source (71), which is mounted on the fixed seat (1) and has a first drive shaft (711) and a second drive shaft (712) extending in the left-right direction at both ends respectively; a first driven shaft (72), which is rotatably connected to the fixed seat (1) and is coaxially connected to the first drive shaft (711); a first driven wheel (73), which is coaxially connected to the first driven shaft (72), and a transmission shaft (731) with an eccentric setting is provided 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 driven shaft (74), which is rotatably connected to the fixed seat (1) and is coaxially connected to the second drive shaft (712); and a second driven wheel (75), which is eccentrically connected to the second driven shaft (74) and is inserted into the transmission hole (42) so as to be rotatable.

2. The sewing machine drive structure according to claim 1, wherein: 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 mounted 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 edges on the front and rear sides 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) limited outside the vertical bar (22) is provided at the end of the first guide post (12).

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) limited outside the feed dog seat (4) is provided at the end of the second guide post (13).

8. The sewing machine drive structure according to claim 1, characterized in that: It also includes The swing arm (5) has its bottom end 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 driving assembly (7); and The machine hook (6) is fixed relative to the swing arm (5).

9. The sewing machine drive structure according to claim 8, wherein: 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 driven shaft (74), and a cam groove (761) is formed on its surface; The first limit post (52) is limited outside the cam (76), and the second limit post (53) is limited in the cam groove (761).

10. The sewing machine drive structure according to any one of claims 1 to 9, characterized in that: The first driving shaft (711) and the second driving shaft (712) are coaxially connected, and the first driven wheel (73) is a gear; The driving assembly (7) further includes A driven gear (77), rotatably connected to the fixed seat (1), and meshing with the first driven wheel (73); And A handwheel (78), rotatably connected to the fixed seat (1), and coaxially connected to the driven gear (77).

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