CN216615085U - Sewing machine's cutter stroke adjusting device - Google Patents
Sewing machine's cutter stroke adjusting device Download PDFInfo
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- CN216615085U CN216615085U CN202122842567.1U CN202122842567U CN216615085U CN 216615085 U CN216615085 U CN 216615085U CN 202122842567 U CN202122842567 U CN 202122842567U CN 216615085 U CN216615085 U CN 216615085U
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Abstract
The utility model provides a cutter stroke adjusting device of a sewing machine, and belongs to the technical field of sewing equipment. This cutter stroke adjusting device is including moving the knife rest, the stationary knife rest, the feed lifting shaft and front axle down, it moves the knife to be fixed with on the knife rest, be fixed with the stationary knife on the stationary knife rest, be connected with on the front axle down and enable the feed lifting shaft to carry out wobbling swing mechanism, be fixed with drive crank on the feed lifting shaft, drive crank's one end articulates there is the swing connecting rod, be fixed with adjust crank on the swing connecting rod, be fixed with the cutter axle on adjust crank, move the knife rest and fix on the cutter axle, the arc spout has been seted up on adjust crank, the one end of swing connecting rod can slide in the arc spout and can fix in the arc spout, the swing connecting rod forms the pin joint with drive crank, the centre of a circle and the pin joint of arc spout are concentric. The cutter stroke adjusting device keeps the kneading amount of the movable cutter and the fixed cutter unchanged after the movable cutter is subjected to stroke adjustment.
Description
Technical Field
The utility model belongs to the technical field of sewing equipment, and relates to a cutter stroke adjusting device of a sewing machine.
Background
In the prior art, a stroke adjusting mechanism of a cutter of a sewing machine generally adopts a linear sliding groove, the swinging stroke of the cutter is changed by adjusting the effective length of a crank to adapt to cutting of cloth with different thicknesses, and the adjustment mechanism adopts a linear groove, so that the kneading amount of a movable cutter and a fixed cutter can be changed after stroke adjustment, manual readjustment is needed, the adjustment is inconvenient, and the quality of the cut cloth can be influenced due to poor kneading amount of the movable cutter and the fixed cutter. Regarding the working principle of the movable knife and the fixed knife, reference may be made to a cutting knife structure of a sewing machine disclosed in chinese patent application No. 201810462177.1.
Disclosure of Invention
Aiming at the problems in the prior art, the utility model provides a cutter stroke adjusting device of a sewing machine, which aims to solve the technical problems that: how to keep the kneading amount of the movable blade and the fixed blade the same.
The purpose of the utility model can be realized by the following technical scheme:
a cutter stroke adjusting device of a sewing machine comprises a movable cutter frame, a fixed cutter frame, a feed lifting shaft and a lower front shaft, a movable knife is fixed on the movable knife rest, a fixed knife is fixed on the fixed knife rest, a swing mechanism capable of enabling the feed lifting shaft to swing is connected on the lower front shaft, a driving crank is fixed on the feed lifting shaft, one end of the driving crank is hinged with a swing connecting rod, an adjusting crank is fixed on the swinging connecting rod, a cutter shaft is fixed on the adjusting crank, the movable cutter frame is fixed on the cutter shaft, it is characterized in that the adjusting crank is provided with an arc-shaped chute, one end of the swinging connecting rod can slide in the arc-shaped chute and can be fixed in the arc-shaped chute, the swing connecting rod and the driving crank form a hinge point, and the circle center of the arc-shaped sliding groove is concentric with the hinge point.
The working principle is as follows: in the cutter stroke adjusting device, the movable cutter is arranged on the movable cutter frame, the fixed cutter is arranged on the fixed cutter frame, the fixed cutter frame is arranged on the mounting seat, the cutter shaft is rotatably arranged on the mounting seat, the lower front shaft drives the feed lifting shaft to swing through the swing mechanism when rotating, the feed lifting shaft drives the swing connecting rod to swing through the driving crank when swinging, the adjusting crank and the cutter shaft swing along with the swing connecting rod, so that the movable cutter frame is driven to swing, and the movable cutter on the movable cutter piece is kneaded with the fixed cutter to finish the cloth cutting action.
The position of the swing connecting rod connected on the adjusting crank determines the swing stroke of the moving knife: when the stroke of the moving blade needs to be adjusted, the swing connecting rod is firstly loosened, then the swing connecting rod is rotated, one end of the swing connecting rod slides in the arc-shaped sliding groove, and then one end of the swing connecting rod is fixed on the adjusting crank, so that the adjustment of the stroke of the moving blade is completed.
In the adjusting process, the swing connecting rod and the driving crank form a hinge point, the swing connecting rod swings around the hinge point, when the feed lifting pin swings to the lowest position, the movable knife also swings to the lowest point position, and at the moment, the hinge point and the circle center of the arc-shaped chute are concentric, so that in the swinging process of the swing connecting rod around the hinge point, the swing connecting rod only slides along the arc-shaped chute, but the positions of the adjusting crank and the cutter shaft cannot be changed, and the kneading amount of the movable knife and the fixed knife is kept unchanged after the movable knife is subjected to stroke adjustment.
In the above cutter stroke adjusting device for the sewing machine, the swing connecting rod and the adjusting crank are fixed through the crank pin and the nut, the crank pin comprises a first fixed pin shaft and a second fixed pin shaft, the first pin shaft is inserted into the arc-shaped sliding groove, the second pin shaft is fixed to one end of the swing connecting rod, the nut is in threaded connection with the first pin shaft, and the nut abuts against the side portion of the adjusting crank.
When the nut is unscrewed, the first pin shaft can slide in the arc-shaped sliding groove to adjust the stroke of the movable knife, then the nut is screwed, and the adjusting crank and the swinging connecting rod are fixed by the nut and the crank pin.
In the cutter stroke adjusting device of the sewing machine, a boss is arranged between the first pin shaft and the second pin shaft, the adjusting crank is positioned between the boss and the nut, one side part of the boss abuts against the side part of the adjusting crank, and the other side part of the boss abuts against the side part of the swinging connecting rod.
The boss separates swing connecting rod and adjusting crank, prevents that swing connecting rod and adjusting crank from taking place wearing and tearing, and boss and nut are located adjusting crank's both sides respectively and support and lean on adjusting crank's a lateral part, and this structure can carry out fine spacing to adjusting crank, prevents to adjust crank along the axial displacement of crank pin.
In the above device for adjusting the stroke of the cutter of the sewing machine, the first pin shaft is provided with a guide part, the guide part is provided with two planes which are arranged oppositely, and each plane is respectively abutted against one groove wall of the arc-shaped sliding groove.
The plane of guide part supports respectively and leans on a cell wall of arc spout, and the contact of the cell wall part of plane and arc spout, at the gliding in-process of crank pin along the arc recess, this structure plays good guide effect, makes the crank pin be difficult for rocking when sliding, improves the accuracy when cutter stroke adjusts.
In the above device for adjusting the stroke of the cutting knife of the sewing machine, the swing mechanism includes a feed lifting eccentric wheel, the feed lifting eccentric wheel is fixed on one end of the lower front shaft, a feed lifting connecting rod is hinged on the feed lifting eccentric wheel, a feed lifting crank is fixed on the feed lifting shaft, a connecting shaft is arranged at the edge of the feed lifting crank, the feed lifting connecting rod is hinged with the connecting shaft, and the lower front shaft is eccentrically arranged with the feed lifting eccentric wheel.
In the structure, the circle centers of the lower front shaft and the feed lifting eccentric wheel are not concentric, so that when the lower front shaft rotates, the feed lifting eccentric wheel is driven to rotate eccentrically, the feed lifting eccentric wheel drives the feed lifting connecting rod to swing, the feed lifting connecting rod drives the feed lifting crank to swing, and the feed lifting shaft swings along with the feed lifting crank.
Compared with the prior art, the utility model has the following advantages:
1. in the cutter stroke adjusting device, the swing connecting rod only slides along the arc-shaped sliding groove in the swing process of the swing connecting rod, but the positions of the adjusting crank and the cutter shaft are not changed, and the kneading amount of the movable cutter and the fixed cutter is kept unchanged after the stroke of the movable cutter is adjusted.
In this cutter stroke adjusting device, the plane of guide part and the cell wall part contact of arc spout, at the gliding in-process of crank pin along the arc recess, make the crank pin be difficult for rocking when sliding, accuracy when improving the cutter stroke and adjusting.
Drawings
FIG. 1 is a schematic view of the cutter stroke adjusting device mounted on a mounting base;
FIG. 2 is a schematic structural view of the cutter stroke adjusting device;
FIG. 3 is a schematic view of the structure of the adjustment crank;
FIG. 4 is a schematic view of a crank pin configuration;
FIG. 5 is a schematic view of the structure of the crank;
fig. 6 is a schematic diagram of the movement locus of the swing link.
In the figure, a knife rest 1, a fixed knife rest 2, a feed lifting shaft 3, a lower front shaft 4, a knife 5, a fixed knife 6, a driving crank 7, a swinging connecting rod 8, a regulating crank 9, a cutter shaft 10, an arc sliding groove 11, a swinging mechanism 12, a mounting seat 13, a crank pin 14, a nut 15, a first pin shaft 16, a second pin shaft 17, a boss 18, a guide part 19, a plane 20, a feed lifting eccentric wheel 21, a feed lifting connecting rod 22, a feed lifting crank 23 and a connecting shaft 24 are connected.
Detailed Description
The following are specific embodiments of the present invention, and the technical solutions of the present invention will be further described with reference to the drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1, 2 and 3, the cutter stroke adjusting device includes a movable cutter holder 1, a fixed cutter holder 2, a tooth lifting shaft 3 and a lower front shaft 4, a movable cutter 5 is fixed on the movable cutter holder 1, a fixed cutter 6 is fixed on the fixed cutter holder 2, a swing mechanism 12 capable of enabling the tooth lifting shaft 3 to swing is connected on the lower front shaft 4, a driving crank 7 is fixed on the tooth lifting shaft 3, one end of the driving crank 7 is hinged to a swing connecting rod 8, an adjusting crank 9 is fixed on the swing connecting rod 8, a cutter shaft 10 is fixed on the adjusting crank 9, the movable cutter holder 1 is fixed on the cutter shaft 10, an arc-shaped chute 11 is formed on the adjusting crank 9, one end of the swing connecting rod 8 can slide in the arc-shaped chute 11 and can be fixed in the arc-shaped chute 11, the swing connecting rod 8 and the driving crank 7 form a hinge point, and the center of the arc-shaped chute 11 is concentric with the hinge point.
The movable knife 5 is installed on the movable knife rest 1, the fixed knife 6 is installed on the fixed knife rest 2, the fixed knife rest 2 is installed on an installation base 13, the knife shaft 10 is rotatably installed on the installation base 13, the lower front shaft 4 drives the feed lifting shaft 3 to swing through the swing mechanism 12 when rotating, the feed lifting shaft 3 drives the swing connecting rod 8 to swing through the driving crank 7 when swinging, the adjusting crank 9 and the knife shaft 10 swing along with the swing connecting rod 8, and therefore the movable knife rest 1 is driven to swing, and the movable knife 5 on the movable knife 5 and the fixed knife 6 are kneaded to complete cloth cutting.
The position of the swing connecting rod 8 connected on the adjusting crank 9 determines the swing stroke of the movable knife 5: when the stroke of the movable blade 5 needs to be adjusted, the swing connecting rod 8 is firstly loosened, then the swing connecting rod 8 is rotated, one end of the swing connecting rod 8 slides in the arc-shaped sliding groove 11, and then one end of the swing connecting rod 8 is fixed on the adjusting crank 9, so that the adjustment of the stroke of the movable blade 5 is completed.
As shown in fig. 6, the trajectory of the swing link 8 when swinging is a partial arc of a circle of a dot-dash line, and in the adjustment process, the swing link 8 and the driving crank 7 form a hinge point around which the swing link 8 swings, and when the feed lifting shaft 3 swings to the lowest position, the movable knife 5 also swings to the lowest point position, and at this time, the hinge point is concentric with the center of the arc chute 11, so that in the process of swinging the swing link 8 around the hinge point, the swing link 8 only slides along the arc chute 11, but the positions of the adjusting crank 9 and the cutter shaft 10 do not change, and therefore, after the movable knife 5 is adjusted in stroke, the kneading amount of the movable knife 5 and the fixed knife 6 remains unchanged.
As shown in fig. 2 and 4, in the present embodiment, the oscillating connecting rod 8 and the adjusting crank 9 are fixed by the crank pin 14 and the nut 15, the crank pin 14 includes a first pin 16 and a second pin 17, the first pin 16 is inserted into the arc-shaped sliding slot 11, the second pin 17 is fixed on one end of the oscillating connecting rod 8, the nut 15 is screwed on the first pin 16, and the nut 15 abuts against the side of the adjusting crank 9.
When the nut 15 is unscrewed, the first pin 16 can slide in the arc-shaped sliding groove 11 to adjust the stroke of the movable blade 5, and then the nut 15 is screwed, and the adjusting crank 9 and the swinging connecting rod 8 are fixed by the nut 15 and the crank pin 14.
As shown in fig. 4, in this embodiment, a boss 18 is provided between the first pin 16 and the second pin 17, the adjusting crank 9 is located between the boss 18 and the nut 15, one side of the boss 18 abuts against the side of the adjusting crank 9, and the other side of the boss 18 abuts against the side of the swing link 8.
The boss 18 separates swing connecting rod 8 and adjusting crank 9, prevents that swing connecting rod 8 and adjusting crank 9 from taking place wearing and tearing, and boss 18 and nut 15 are located adjusting crank 9's both sides respectively and lean on adjusting crank 9's a lateral part, and this structure can carry out fine spacing to adjusting crank 9, prevents to adjust crank 9 along the axial displacement of crank pin 14.
In the embodiment shown in fig. 4, the first pin 16 has a guiding portion 19, and the guiding portion 19 has two oppositely disposed planes 20, and each plane 20 abuts against one of the slot walls of the arc-shaped sliding slot 11.
The plane 20 of the guide part 19 is respectively abutted against one groove wall of the arc-shaped sliding groove 11, the plane 20 is partially contacted with the groove wall of the arc-shaped sliding groove 11, and in the process that the crank pin 14 slides along the arc-shaped groove, the structure plays a good role in guiding, so that the crank pin 14 is not easy to shake during sliding, and the accuracy of cutter stroke adjustment is improved.
As shown in fig. 1 and 5, in the present embodiment, the swing mechanism 12 includes a tooth lifting eccentric wheel 21, the tooth lifting eccentric wheel 21 is fixed on one end of the lower front shaft 4, a tooth lifting connecting rod 22 is hinged on the tooth lifting eccentric wheel 21, a tooth lifting crank 23 is fixed on the tooth lifting shaft 3, a connecting shaft 24 is provided at an edge of the tooth lifting crank 23, the tooth lifting connecting rod 22 is hinged with the connecting shaft 24, and the lower front shaft 4 is eccentrically arranged with the tooth lifting eccentric wheel 21.
In the structure, the circle centers of the lower front shaft 4 and the cam 21 are not concentric, so that when the lower front shaft 4 rotates, the cam 21 is driven to rotate eccentrically, the cam 21 drives the cam connecting rod 22 to swing, the cam connecting rod 22 drives the cam crank 23 to swing, and the cam shaft 3 swings along with the cam crank 23.
The specific embodiments described herein are merely illustrative of the spirit of the utility model. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the utility model as defined in the appended claims.
Claims (5)
1. A cutter stroke adjusting device of a sewing machine comprises a movable cutter holder (1), a fixed cutter holder (2), a tooth lifting shaft (3) and a lower front shaft (4), wherein the movable cutter (5) is fixed on the movable cutter holder (1), the fixed cutter (6) is fixed on the fixed cutter holder (2), a swing mechanism (12) capable of enabling the tooth lifting shaft (3) to swing is connected onto the lower front shaft (4), a driving crank (7) is fixed on the tooth lifting shaft (3), one end of the driving crank (7) is hinged with a swing connecting rod (8), an adjusting crank (9) is fixed on the swing connecting rod (8), a cutter shaft (10) is fixed on the adjusting crank (9), the movable cutter holder (1) is fixed on the cutter shaft (10), and the cutter stroke adjusting device is characterized in that an arc-shaped chute (11) is formed in the adjusting crank (9), one end of the swing connecting rod (8) can slide in the arc-shaped sliding groove (11) and can be fixed in the arc-shaped sliding groove (11), the swing connecting rod (8) and the driving crank (7) form a hinged point, and the circle center of the arc-shaped sliding groove (11) is concentric with the hinged point.
2. The cutter stroke adjusting device of the sewing machine as claimed in claim 1, wherein the oscillating link (8) and the adjusting crank (9) are fixed by a crank pin (14) and a nut (15), the crank pin (14) comprises a first pin shaft (16) and a second pin shaft (17) which are fixed, the first pin shaft (16) is inserted into the arc-shaped chute (11), the second pin shaft (17) is fixed on one end of the oscillating link (8), the nut (15) is in threaded connection with the first pin shaft (16), and the nut (15) abuts against the side of the adjusting crank (9).
3. The cutter stroke adjusting device of the sewing machine as claimed in claim 2, wherein a boss (18) is provided between the first pin (16) and the second pin (17), the adjusting crank (9) is located between the boss (18) and the nut (15), one side portion of the boss (18) abuts against a side portion of the adjusting crank (9), and the other side portion of the boss (18) abuts against a side portion of the swing connecting rod (8).
4. The cutter stroke adjusting device of the sewing machine as claimed in claim 2, wherein the first pin (16) has a guide portion (19), the guide portion (19) has two oppositely disposed planes (20), and each plane (20) abuts against one groove wall of the arc-shaped chute (11).
5. The cutter stroke adjusting device of the sewing machine according to claim 1, wherein the swing mechanism (12) comprises a feed lifting eccentric wheel (21), the feed lifting eccentric wheel (21) is fixed on one end of the lower front shaft (4), a feed lifting connecting rod (22) is hinged on the feed lifting eccentric wheel (21), a feed lifting crank (23) is fixed on the feed lifting shaft (3), a connecting shaft (24) is arranged at the edge of the feed lifting crank (23), the feed lifting connecting rod (22) is hinged with the connecting shaft (24), and the lower front shaft (4) and the feed lifting eccentric wheel (21) are eccentrically arranged.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122842567.1U CN216615085U (en) | 2021-11-19 | 2021-11-19 | Sewing machine's cutter stroke adjusting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122842567.1U CN216615085U (en) | 2021-11-19 | 2021-11-19 | Sewing machine's cutter stroke adjusting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216615085U true CN216615085U (en) | 2022-05-27 |
Family
ID=81697035
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122842567.1U Active CN216615085U (en) | 2021-11-19 | 2021-11-19 | Sewing machine's cutter stroke adjusting device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216615085U (en) |
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2021
- 2021-11-19 CN CN202122842567.1U patent/CN216615085U/en active Active
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