CN216809196U

CN216809196U - Stitch switching mechanism of sewing machine

Info

Publication number: CN216809196U
Application number: CN202220169492.7U
Authority: CN
Inventors: 张文鸿; 陈济南
Original assignee: Foshan Ukicra Electric Co ltd
Current assignee: Foshan Ukicra Electric Co ltd
Priority date: 2022-01-21
Filing date: 2022-01-21
Publication date: 2022-06-24
Anticipated expiration: 2032-01-21

Abstract

The utility model discloses a stitch switching mechanism of a sewing machine, which comprises a driving mechanism, a speed change component, a needle bar frame and a needle bar, wherein the needle bar is matched with the speed change component through an upper driving component and a lower driving component; the needle bar push rod is matched with the adjusting component, so that one end of the needle bar push rod, which is far away from the needle bar frame, is abutted against or separated from the swinging component; when the stitch is in a curve mode, one end of the needle rod push rod, which is far away from the needle rod frame, is abutted against the swinging assembly, and the swinging assembly is matched with the needle rod push rod to do reciprocating motion; when the stitch is in a straight line mode, the adjusting component is matched with the needle rod push rod to enable the needle rod push rod to be separated from the swinging component; therefore, the switching between the zigzag stitch and the linear stitch is realized.

Description

Stitch switching mechanism of sewing machine

Technical Field

The utility model relates to the technical field of sewing, in particular to a stitch switching mechanism of a sewing machine.

Background

The sewing machine is a common device in life, and is a machine which uses one or more sewing threads to form one or more stitches on a sewing material to enable one or more layers of sewing materials to be interwoven or sewed, but when the existing sewing machine is used, the stitches of zigzag sewing by a machine needle need more parts to be matched, and the structural connection is complex.

SUMMERY OF THE UTILITY MODEL

The utility model aims to design a stitch switching mechanism of a sewing machine, which solves the problems of the prior art.

In order to achieve the purpose, the utility model provides the following technical scheme: a stitch switching mechanism of a sewing machine comprises a driving mechanism, a speed change component, a needle bar frame and a needle bar, wherein the speed change component is connected with the output end of the driving mechanism, the needle bar is arranged in the needle bar frame and can move up and down in the needle bar frame, the needle bar is matched with the speed change component through an upper driving component and a lower driving component, and the speed change component is also matched with a swinging component; the needle bar frame is movably connected to the fixed frame through a swinging shaft, and a needle bar push rod is connected to the needle bar frame; the needle bar push rod is matched with the adjusting component, so that one end of the needle bar push rod, which is far away from the needle bar frame, can be abutted against or separated from the swinging component; when the stitch is in a curve mode, one end of the needle rod push rod, which is far away from the needle rod frame, is abutted against the swing assembly, and when the stitch is in a straight line mode, one end of the needle rod push rod, which is far away from the needle rod frame, is separated from the swing assembly.

Further, the up-down driving assembly comprises a cross shaft, a swing arm connected with one end of the cross shaft and a second bevel gear connected with the other end of the cross shaft, and the second bevel gear is matched with the first bevel gear; the swing arm is kept away from the one end of cross axle is connected with carries the needle connecting rod, it is connecting to carry the needle connecting rod the opposite face of swing arm is connected with conversion components, carry the needle connecting rod with the needle bar passes through the connecting piece to be connected, the connecting piece can be realized the reciprocating that the needle bar can be stable also can realize the needle bar can not receive the hindrance when the horizontal hunting.

Further, the output end of the driving mechanism is connected with a motor gear, the speed change assembly comprises a rotating shaft, a first gear, a second gear, a third gear and a first bevel gear, the number of the teeth of the first gear, the second gear and the third gear is different, the first gear is meshed with the motor gear, the second gear, the third gear and the first bevel gear are all mounted on the rotating shaft, and the third gear is meshed with the swing assembly; the first gear is meshed with the second gear, and the first bevel gear is matched with the upper and lower driving components; the rotating speed of the driving mechanism reaches the speed required by the needle bar sewing through the matching of the motor teeth, the first gear, the second gear, the third gear, the first bevel gear and the second bevel gear.

Furthermore, the swing assembly comprises a fourth gear matched with the speed change assembly, a rotating ring is arranged on the fourth gear, a protrusion is arranged on the surface of the rotating ring, and the protrusion is matched with the needle rod push rod to realize the reciprocating motion of the needle rod push rod.

Further, the adjusting part includes adjust knob, adjusting cam and regulation mounting, adjust knob pass through the regulating spindle with adjusting cam connects, adjusting cam installs in the frame, adjusting cam's surface is equipped with a plurality of recesses, adjust mounting with the recess cooperation, adjusting cam is setting up the opposite face of recess is equipped with the rib, adjusting cam with the cooperation of needle bar push rod.

The needle bar pushing rod is characterized by further comprising an adjusting screw, the edge of the adjusting cam is provided with convex edges with different heights, the adjusting screw is installed on the needle bar pushing rod, and the adjusting screw is matched with the convex edges.

Compared with the prior art, the utility model has the beneficial effects that: the stitch switching mechanism of the sewing machine drives the speed change component to move through the driving mechanism, converts the speed of the driving mechanism into the speed suitable for the needle rod to sew, and is matched with the swinging component to rotate through the speed change component; the swinging assembly, the adjusting assembly and the needle rod push rod are matched, so that when the stitch is in a curve mode, one end of the needle rod push rod, which is far away from the needle rod frame, is abutted against the swinging assembly, the swinging assembly is matched with the needle rod push rod to do reciprocating motion, the needle rod push rod transmits the power of the reciprocating motion to the needle rod frame, and finally the needle rod frame swings around the fixed frame by taking the axis of the swinging shaft as a swinging center; when the stitch is in a linear mode, the adjusting component is matched with the needle rod push rod to separate the needle rod push rod from the swinging component; therefore, the switching between the zigzag stitch and the linear stitch is realized.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the curved needle bar-carrying push rod of the present invention engaged with a rotating ring;

FIG. 3 is a schematic view of the engagement between the push rod and the rotating ring of the present invention;

the names of the components identified in the figures are as follows:

1. a frame; 2. a drive mechanism; 3. a needle bar frame; 4. a needle bar; 5. a fixed mount; 6. a needle bar push rod; 7. a swing shaft; 8. an adjustment assembly; 9. a speed change assembly; 10. a rotating ring; 11. a fourth gear; 12. a third gear; 13. a first bevel gear; 14. a second bevel gear; 15. an up-down driving assembly; 16. a bearing seat; 17. a horizontal axis; 18. a rotating shaft; 19. swinging arms; 20. a needle lifting connecting rod; 21. a conversion component; 22. a motor tooth; 23. a protrusion; 24. adjusting a knob; 25. an adjustment cam; 26. adjusting the fixing piece; 27. a groove; 28. adjusting screws; 29. ribs; 30. a first gear.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the description is only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Example (b): referring to fig. 1-3, a stitch switching mechanism of a sewing machine comprises a driving mechanism 2, a speed change assembly 9, a needle bar frame 3 and a needle bar 4, wherein the bottom of the needle bar is used for installing a machine needle, the machine needle is used for sewing cloth, the speed change assembly 9 is connected with the output end of the driving mechanism 2, the needle bar 4 is installed in the needle bar frame 3 and can move up and down in the needle bar frame 3, the needle bar 4 is matched with the speed change assembly 9 through an upper driving assembly 15 and a lower driving assembly 15, and the speed change assembly 9 is also matched with a swinging assembly; the speed change component is matched with the swing component to rotate and is also matched with the upper and lower driving components to rotate at the same time, so that the up-and-down movement of the needle rod is realized; therefore, the sewing machine can sew various stitches. The needle bar frame 3 is movably connected to the fixed frame 5 through a swinging shaft 7, and the needle bar frame 3 is connected with a needle bar push rod 6; the needle bar push rod 6 is matched with the adjusting component 8, so that one end of the needle bar push rod 6 far away from the needle bar frame 3 can be abutted against or separated from the swinging component; when the stitch is in a curve mode, one end of the needle rod push rod 6, which is far away from the needle rod frame 3, is abutted against the swinging assembly, and when the stitch is in a straight line mode, one end of the needle rod push rod 6, which is far away from the needle rod frame 3, is separated from the swinging assembly.

The up-down driving assembly 15 comprises a transverse shaft 17, a swing arm 19 connected with one end of the transverse shaft 17 and a second bevel gear connected with the other end of the transverse shaft 17, the first bevel gear 13 is rotatably arranged on a bearing seat 16 through a rotating shaft 18, the bearing seat is L-shaped, and the second bevel gear 14 is matched with the first bevel gear 13 in the speed change assembly 9; one end of the swing arm 19, which is far away from the transverse shaft 17, is connected with a needle lifting connecting rod 20, the needle lifting connecting rod 20 is connected with a conversion assembly 21 on the opposite surface of the connecting swing arm 19, the needle lifting connecting rod 20 is connected with the needle rod 4 through a connecting piece, and the connecting piece is in clearance fit with the needle lifting connecting rod 20, namely, the connecting piece and the needle lifting connecting rod 20 can rotate relatively, so that the connecting piece can realize that the needle rod 4 can stably move up and down, and the needle rod 4 can not be hindered when swinging left and right; specifically, the second bevel gear 14 is engaged with the first bevel gear on the speed changing assembly 9, so that the vertical rotating power of the first bevel gear is converted into the horizontal rotating power of the second bevel gear 14, and further the horizontal shaft 17 is driven to rotate, the horizontal shaft 17 drives the swing arm 19 to rotate, the swing arm 19 converts the rotating power into the power for the needle rod 4 to move up and down through the matching conversion assembly 21, and finally, the needle rod 4 is driven to move up and down to sew the cloth.

The output end of the driving mechanism 2 is connected with a motor tooth 22, the driving mechanism 2 is a motor, in this embodiment, specifically, the speed changing assembly 9 includes a rotating shaft 18, a first gear 30, a second gear, a third gear 12 and a first bevel gear 13, the numbers of teeth of the first gear 30, the second gear and the third gear 12 are all different, the first gear 30 is engaged with the motor tooth 22, the second gear, the third gear 12 and the first bevel gear 13 are all mounted on the rotating shaft 18, the second bevel gear 14 is rotatably mounted on a bearing seat 16 through a transverse shaft 17, and the third gear 12 is engaged with a fourth gear 11 on the swinging assembly; the first gear 30 is engaged with the second gear, the first bevel gear 13 is engaged with the up-down driving assembly 15, specifically, the first bevel gear 13 is engaged with the second bevel gear 14, the vertical rotating power of the first bevel gear 13 is transmitted to the second bevel gear 14, and the second bevel gear 14 converts the vertical rotating power into the horizontal rotating power. The motor teeth 22 are meshed with the first gear 30, the first gear 30 is also meshed with the second gear, the second gear is also meshed with the third gear 12, the third gear 12 is also matched with the swinging assembly, the rotating speed of the motor is gradually reduced to the rotating speed required by swinging of the sewing machine, and the rotating speed of the driving mechanism 2 reaches the speed required by up-and-down movement of the needle rod 4 through meshing of the first bevel gear 13 and the second bevel gear 14. It should be noted that there are many gears for adjusting the speed change, and the gears are not limited to the first gear 30, the second gear, and the third gear 12 mentioned in the present embodiment. The swing component comprises a fourth gear 11 matched with the speed change component 9, the fourth gear 11 is arranged on a bearing seat 16 through a gear shaft, in the embodiment, the fourth gear 11 is specifically meshed with a third gear 12, namely the rotating speed of the motor is converted into the speed required by the swing component through the speed change component 9, a rotating ring 10 is arranged on the fourth gear 11, a bulge 23 is arranged on the surface of the rotating ring 10, the bulge 23 is matched with the needle rod push rod 6 to realize the reciprocating motion of the needle rod push rod 6, specifically, when the needle rod 4 is required to do the swing motion, the needle rod push rod 6 is always abutted against the rotating ring 10, the rotating ring 10 rotates, a height difference is formed at the abutted part with the needle rod push rod 6, the needle rod push rod 6 is pushed to do the reciprocating motion by the height difference formed by the rotating ring 10, the needle rod push rod 6 can drive the needle rod frame 3 to do the swing motion on the fixed frame 5 by taking the swing shaft 7 as the axis when doing the reciprocating motion back and forth, the swinging motion of the needle bar 4 is realized, and the needle bar 4 is matched with the up-and-down movement, so that the zigzag sewing can be realized.

The adjusting component 8 comprises an adjusting knob 24, an adjusting cam 25 and an adjusting fixing piece 26, wherein the adjusting knob 24 is connected with the adjusting cam 25 through an adjusting shaft, the adjusting cam 25 is installed on the rack 1, a plurality of grooves 27 are formed in the surface of the adjusting cam 25, the adjusting fixing piece 26 is matched with the grooves 27, ribs 29 are arranged on the adjusting cam 25 at the opposite surface of the grooves 27, the adjusting cam 25 is matched with the needle rod push rod 6, the adjusting shaft is screwed through the adjusting knob 24 to adjust the position of the ribs 29 relative to the needle rod push rod 6, when the stitch is a curve, the position of the ribs 29 is adjusted to ensure that the ribs 29 are not contacted with the needle rod push rod 6, at the moment, the groove 27 is clamped by the adjusting fixing piece 26, the position of the adjusting cam 25 is fixed, the needle rod push rod 6 is abutted against the rotating ring 10, the needle rod push rod 6 is pushed to do reciprocating motion by utilizing the height difference of the surface of the rotating ring 10, and when the needle rod 4 does reciprocating motion, the up-and-down driving component 15 drives the needle bar 4 to move up and down, and finally, zigzag sewing of the machine sewing on the needle bar 4 is realized. When the stitch is a straight line, the position of the rib 29 is adjusted, the needle bar push rod 6 is lifted by the rib 29 on the adjusting cam 25, at this time, the adjusting fixing piece 26 can clamp the groove 27 at the current position of the adjusting cam 25, the position of the adjusting cam 25 is fixed, the needle bar push rod 6 is separated from the rotating ring 10, the needle bar push rod 6 is not moved, the upper and lower driving assembly 15 drives the needle bar 4 to move up and down, and the straight line action of the sewing machine on the needle bar 4 is realized. The needle bar pushing rod mechanism further comprises an adjusting screw 28, the edge of the adjusting cam 25 is provided with convex edges with different heights, the adjusting screw 28 is installed on the needle bar pushing rod 6, and the adjusting screw 28 is matched with the convex edges. Specifically, the convex edges with different heights are arranged at the edge of the cam to control the line width of the zigzag seam of the needle sewing machine on the needle rod 4, when narrow zigzag seam sewing is needed, the convex edge on the adjusting cam 25 is turned to one surface of the adjusting screw 28 by the adjusting knob 24, the position of the adjusting cam 25 is fixed by the adjusting fixing piece 26, therefore, when the zigzag seam sewing is needed, the reciprocating distance of the needle rod push rod 6 is controlled by the adjusting screw 28 and the convex edge, the needle rod push rod 6 returns after being pushed out, and when the adjusting screw 28 abuts against the convex edge, the needle rod push rod stops, and the line width of the zigzag seam sewing is achieved. When a zigzag seam with the width of the vehicle is needed, the adjusting knob 24 is used for turning the upper convex edge of the adjusting cam 25 to the lower position of one side of the adjusting screw 28, the position of the adjusting cam 25 is fixed by the adjusting fixing piece 26, therefore, during the zigzag seam turning, the reciprocating distance of the needle rod push rod 6 is controlled by the adjusting screw 28 and the convex edge, the needle rod push rod 6 is pushed out and then returns, and when the adjusting screw 28 abuts against the convex edge, the needle rod push rod stops, and the width of the zigzag seam turning is the line width.

The working principle of the embodiment is as follows: when the straight line needs to be turned, the adjusting component 8 is adjusted, so that one end, far away from the needle bar frame 3, of the needle bar push rod 6 is separated from the swinging component, the driving mechanism 2 is started, the power of the driving mechanism 2 is changed in speed through the speed changing component 9 to reach the speed suitable for the work of the sewing machine, the speed changing component 9 transmits the power to the upper and lower driving components 15, the upper and lower driving components 15 drive the needle bar 4 to move up and down, and the straight line of the needle on the needle bar 4 on the cloth is turned; when needing the car curve, adjust adjusting part 8 for needle bar push rod 6 keep away from needle bar frame 3 one end with swing subassembly butt starts actuating mechanism 2, actuating mechanism 2's power reaches the speed that sewing machine work is fit for via speed change assembly 9 variable speed, speed change assembly 9 conveys power simultaneously on swing subassembly and upper and lower drive assembly 15, swing subassembly drive needle bar push rod 6 is reciprocating motion, needle bar push rod 6 promotes needle bar frame 3 and uses swing axle 7 to do the swing action on mount 5 as the centre of a circle, realize the swing of needle bar 4, drive assembly 15 drive needle bar 4 reciprocates about needle bar 4 wobbling while, needle bar 4 also is doing the up-and-down motion in the wobbling promptly, realize the car zigzag seam.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "upper", "lower", "left", "right", "front", "rear", and the like as used herein are for illustrative purposes only.

Claims

1. A stitch switching mechanism of a sewing machine comprises a driving mechanism, a speed changing component, a needle bar frame and a needle bar, wherein the speed changing component is connected with the output end of the driving mechanism, the needle bar is arranged in the needle bar frame and can move up and down in the needle bar frame, the needle bar is matched with the speed changing component through an upper driving component and a lower driving component, and the stitch switching mechanism is characterized in that: the speed change assembly is also matched with the swinging assembly; the needle bar frame is movably connected to the fixed frame through a swinging shaft, and a needle bar push rod is connected to the needle bar frame; the needle bar push rod is matched with the adjusting component, so that one end of the needle bar push rod, which is far away from the needle bar frame, can be abutted against or separated from the swinging component.

2. The stitch switching mechanism of a sewing machine according to claim 1, characterized in that: the output end of the driving mechanism is connected with a motor gear, the speed change component comprises a rotating shaft, a first gear, a second gear, a third gear and a first bevel gear, the number of the teeth of the first gear, the second gear and the third gear can be different, the first gear is meshed with the motor gear, the second gear, the third gear and the first bevel gear are all arranged on the rotating shaft, and the third gear is meshed with the swing component; the first gear is meshed with the second gear, and the first bevel gear is matched with the upper and lower driving components.

3. The stitch switching mechanism of a sewing machine according to claim 1, characterized in that: the up-down driving assembly comprises a transverse shaft, a swing arm connected with one end of the transverse shaft and a second conical gear connected with the other end of the transverse shaft, and the second conical gear is matched with the speed change assembly; the swing arm is kept away from the one end of cross axle is connected with carries the needle connecting rod, carry the needle connecting rod and be connecting the opposite face of swing arm is connected with conversion components, carry the needle connecting rod with the needle bar passes through the connecting piece and connects.

4. The stitch switching mechanism of a sewing machine according to claim 1, characterized in that: the swing assembly comprises a fourth gear matched with the speed change assembly, a rotating ring is arranged on the fourth gear, a protrusion is arranged on the surface of the rotating ring, and the protrusion is matched with the needle rod push rod.

5. The stitch switching mechanism of a sewing machine according to claim 1, characterized in that: the adjusting component comprises an adjusting knob, an adjusting cam and an adjusting fixing piece, the adjusting knob is connected with the adjusting cam through an adjusting shaft, the adjusting cam is installed on the rack, the adjusting cam is matched with the needle rod push rod, a plurality of grooves are formed in the surface of the adjusting cam, the adjusting fixing piece is matched with the grooves, and the adjusting cam is arranged on the opposite surface of the grooves and is provided with ribs.

6. The stitch switching mechanism of a sewing machine according to claim 1, characterized in that: still include adjusting screw, adjusting component's edge is equipped with the not protruding edge of co-altitude, adjusting screw installs on the needle bar push rod, adjusting screw with protruding edge cooperation.