CN215947586U - Thread trimming mechanism for overedger - Google Patents
Thread trimming mechanism for overedger Download PDFInfo
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- CN215947586U CN215947586U CN202122135234.5U CN202122135234U CN215947586U CN 215947586 U CN215947586 U CN 215947586U CN 202122135234 U CN202122135234 U CN 202122135234U CN 215947586 U CN215947586 U CN 215947586U
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Abstract
The utility model relates to a thread trimming mechanism for a overedger, which belongs to the technical field of sewing equipment and comprises a stepping motor fixed on a frame, wherein the stepping motor is connected with a movable knife through a driving device, a fixed knife matched with the movable knife is arranged on the frame, the driving device comprises a cam, a thread trimming lever, a lever pin, a thread trimming lever bracket, a thread trimming connecting rod and a movable knife fixed rod, the cam is fixed on a rotating shaft of the stepping motor, the middle end part of the thread trimming lever is sleeved with the lever pin, the lever pin is fixed on the thread trimming lever bracket, the thread trimming lever bracket is fixed on the frame, the lever pin is sleeved with a reset torsion spring, one end of the reset torsion spring is abutted against the lever pin, the other end of the reset torsion spring is abutted against the thread trimming lever, one end of the thread trimming lever is provided with a sliding rod, and the sliding rod is constantly contacted with the side surface of the cam, the utility model aims to provide a thread trimming mechanism with simple structure, the thread trimming mechanism for the overedger has the advantages of rapid thread trimming action, quick response, high accuracy and convenient maintenance.
Description
Technical Field
The utility model belongs to the technical field of sewing equipment, relates to an overlock machine, and particularly relates to a thread trimming mechanism for an overlock machine.
Background
What the trimming structure on a lot of hemming machines all adopted is automatic trimming, so can save time, reduce the labour, improve work efficiency, now, what the trimming drive structure adopted is as the drive by the motor, drive gear or cam drive, and then drive the action of trimming, the action that this kind of common mechanical transmission formula structure can make the trimming is relatively slower, not fast enough, the reaction is slow, the accuracy is not high, thereby influence the quality, if meet when the trouble, the maintenance is also more troublesome.
Disclosure of Invention
The utility model aims to provide a thread trimming mechanism for a overedger, which has the advantages of simple structure, quick thread trimming action, quick response, high accuracy and convenience in maintenance.
A thread trimming mechanism for a overedger comprises a stepping motor fixed on a frame, wherein the stepping motor is connected with a movable cutter through a driving device, a fixed cutter matched with the movable cutter is arranged on the frame, the driving device comprises a cam, a thread trimming lever, a lever pin, a thread trimming lever support, a thread trimming connecting rod and a movable cutter fixing rod, the cam is fixed on a rotating shaft of the stepping motor, the lever pin is sleeved at the middle end of the thread trimming lever and fixed on the thread trimming lever support, the thread trimming lever support is fixed on the frame, a reset torsion spring is sleeved on the lever pin, one end of the reset torsion spring is abutted against the lever pin, the other end of the reset torsion spring is abutted against the thread trimming lever, a sliding rod is arranged at one end of the thread trimming lever and is constantly contacted with the side face of the cam, and the other end of the thread trimming lever is connected with one end of the thread trimming connecting rod, the movable knife fixing rod is sleeved in the rack, a movable knife is fixed at one end of the movable knife fixing rod, and the other end of the movable knife fixing rod is connected with the other end of the trimming connecting rod.
In the thread trimming mechanism for the overedger, the cam is provided with the stroke track, the stroke track is provided with the bulge, and the transition arc is arranged between the bulge and the stroke track.
In the thread trimming mechanism for an overlock machine described above, the slide bar is in contact with the stroke rail at all times.
In the thread trimming mechanism for the overedger, the sliding rod is sleeved with the ball, and the ball is in contact with the stroke track.
In the thread trimming mechanism for an overlock machine described above, the length of the projection occupies at least one quarter of the length of the stroke rail.
In the thread trimming mechanism for the overedger, the lever pin is further provided with a limiting check ring and an adjusting piece, the reset torsion spring is located between the limiting check ring and the adjusting piece, the adjusting piece is in threaded connection with the lever pin, and the limiting check ring is tightly attached to the thread trimming lever.
In the thread trimming mechanism for the overedger, one section of the thread trimming lever support is bent outwards and is far away from the rack, and the other section of the thread trimming lever support is fixed on the rack through the fixing piece.
In the thread trimming mechanism for the overedger, both ends of the thread trimming connecting rod are respectively connected with the thread trimming lever and the movable knife fixing rod through bolts.
In the thread trimming mechanism for the overedger, the thread trimming connecting rod is of an arc-shaped structure.
Compared with the prior art, the utility model has the outstanding and beneficial technical effects that:
the stepping motor rotates to drive the cam to rotate, the cam rotates for a circle at the moment, the trimming lever abutted against the cam swings once, the trimming lever is sleeved on the lever pin, a return spring is arranged between the trimming lever and the lever pin, the trimming lever swings and then returns to a set position under the control of the return spring, the trimming lever swings by taking the lever pin as a center, the trimming lever swings and then drives the trimming connecting rod to swing, the trimming connecting rod drives the movable cutter fixing rod to rotate, and finally the movable cutter fixing rod drives the movable cutter to rotate and the fixed cutter to complete one trimming action.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is one of the schematic internal structural views of the present invention;
FIG. 3 is a second schematic diagram of the internal structure of the present invention;
fig. 4 is a schematic view of the structure of the cam of the present invention.
The reference numerals in the figures denote the meanings:
1-a frame; 2-a step motor; 3, moving a knife; 4-stationary knife; 21-a cam; 22-a trimming lever; 23-a lever pin;
24-trimming lever support; 25-trimming connecting rod; 26-moving blade fixing rod; 211-travel track; 212-a bump;
221-a sliding bar; 222-a ball bearing; 231-a return torsion spring; 232-limit retainer ring; 233-adjustment member.
Detailed Description
The utility model is further described below with reference to specific examples:
as shown in fig. 1-4: a thread trimming mechanism for an overlock machine comprises a stepping motor 2 fixed on a rack 1, wherein the stepping motor 2 is connected with a movable knife 3 through a driving device, a fixed knife 4 matched with the movable knife 3 is arranged on the rack 1, the driving device comprises a cam 21, a thread trimming lever 22, a lever pin 23, a thread trimming lever support 24, a thread trimming connecting rod 25 and a movable knife fixing rod 26, the cam 21 is fixed on a rotating shaft of the stepping motor 2, a lever pin 23 is sleeved at the middle end of the thread trimming lever 22, the lever pin 23 is fixed on the thread trimming lever support 24, the thread trimming lever support 24 is fixed on the rack 1, a reset torsion spring 231 is sleeved on the lever pin 23, one end of the reset torsion spring 231 is abutted against the lever pin 23, the other end of the reset torsion spring is abutted against the thread trimming lever 22, a sliding rod 221 is arranged at one end of the thread trimming lever 22, and the sliding rod 221 is constantly contacted with the side face of the cam 21, the other end of the trimming lever 22 is connected with one end of a trimming connecting rod 25, the movable blade fixing rod 26 is sleeved in the rack 1, the movable blade 3 is fixed at one end of the movable blade fixing rod 26, the other end of the movable blade fixing rod is connected with the other end of the trimming connecting rod 25, the cam is driven to rotate through rotation of the stepping motor, the cam rotates for a circle at the moment, the trimming lever abutted against the cam swings once, the trimming lever is sleeved on a lever pin, a reset spring is arranged between the trimming lever and the lever pin, the trimming lever swings and returns to a set position under the control of the reset spring, the trimming lever swings by taking the lever pin as a center, the trimming lever swings to drive the trimming connecting rod to swing, the trimming connecting rod drives the movable blade fixing rod to rotate, and finally the movable blade fixing rod drives the movable blade to rotate and complete one trimming action with the fixed blade.
In the thread trimming mechanism for the overedger, the cam 21 is provided with the stroke track 211, the stroke track 211 is provided with the protrusion 212, and the transition arc is arranged between the protrusion 212 and the stroke track 211, specifically, when the sliding rod passes through the protrusion each time, the thread trimming lever swings once to complete thread trimming, and the protrusion is in a semi-elliptical shape.
In the thread trimming mechanism for the overedger, the sliding rod 221 is in contact with the stroke track 211 at a moment, so that the thread trimming precision is improved, and the thread trimming lever swings once to complete thread trimming operation as long as the cam rotates for one circle.
In the thread trimming mechanism for the overedger, the sliding rod 221 is sleeved with the ball 222, the ball 222 is in contact with the stroke track 211, and the ball is arranged to reduce the friction force between the ball and the cam, so that the fluency of the thread trimming device can be improved.
In the thread cutting mechanism for the overedger, the length of the protrusion 212 occupies at least one fourth of the length of the stroke track 211, and particularly, the protrusion is used for ensuring the engagement between the movable knife and the fixed knife and cutting off redundant threads.
In the thread trimming mechanism for the overedger, the lever pin 23 is further provided with a limiting retainer ring 232 and an adjusting piece 233, the reset torsion spring 231 is located between the limiting retainer ring 232 and the adjusting piece 233, the adjusting piece 233 and the lever pin 23 are in threaded connection, and the limiting retainer ring 232 is tightly attached to the thread trimming lever 22.
In the thread trimming mechanism for the overedger, one section of the thread trimming lever support 24 is bent outwards and is far away from the rack 1, and the other section of the thread trimming lever support is fixed on the rack 1 through a fixing piece.
In the thread trimming mechanism for the overedger, both ends of the thread trimming connecting rod 25 are respectively connected with the thread trimming lever 22 and the movable knife fixing rod 26 through bolts, and the thread trimming connecting rod 25 is of an arc-shaped structure, so that the thread trimming connecting rod is matched with the thread trimming fixing rod, and the rotation smoothness of the thread trimming fixing rod can be improved.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered by the protection scope of the utility model.
Claims (9)
1. The utility model provides a thread trimming mechanism for overedger, is including fixing step motor (2) in frame (1), step motor (2) are connected through drive arrangement and are moved sword (3), be provided with on frame (1) with move stationary knife (4) of sword (3) adaptation, its characterized in that: the driving device comprises a cam (21), a trimming lever (22), a lever pin (23), a trimming lever support (24), a trimming connecting rod (25) and a movable knife fixing rod (26), wherein the cam (21) is fixed on a rotating shaft of the stepping motor (2), the lever pin (23) is sleeved at the middle end part of the trimming lever (22), the lever pin (23) is fixed on the trimming lever support (24), the trimming lever support (24) is fixed on the rack (1), a reset torsion spring (231) is sleeved on the lever pin (23), one end of the reset torsion spring (231) is abutted against the lever pin (23), the other end of the reset torsion spring is abutted against the trimming lever (22), one end of the trimming lever (22) is provided with a sliding rod (221), the sliding rod (221) is constantly contacted with the side surface of the cam (21), and the other end of the trimming lever (22) is connected with one end of the trimming connecting rod (25), the movable knife fixing rod (26) is sleeved in the rack (1), a movable knife (3) is fixed at one end of the movable knife fixing rod (26), and the other end of the movable knife fixing rod is connected with the other end of the trimming connecting rod (25).
2. The thread trimming mechanism for an overlock machine as claimed in claim 1, wherein: the cam (21) is provided with a stroke track (211), the stroke track (211) is provided with a bulge (212), and a transition arc is arranged between the bulge (212) and the stroke track (211).
3. The thread trimming mechanism for an overlock machine as claimed in claim 2, wherein: the sliding rod (221) is in contact with the travel path (211) at all times.
4. The thread trimming mechanism for an overlock machine as claimed in claim 3, wherein: the sliding rod (221) is sleeved with a ball (222), and the ball (222) is in contact with the stroke track (211).
5. The thread trimming mechanism for an overlock machine as claimed in claim 3, wherein: the length of the projection (212) occupies at least one quarter of the length of the travel track (211).
6. The thread trimming mechanism for an overlock machine as claimed in claim 1, wherein: the wire shearing device is characterized in that a limiting check ring (232) and an adjusting piece (233) are further arranged on the lever pin (23), the reset torsion spring (231) is located between the limiting check ring (232) and the adjusting piece (233), the adjusting piece (233) is in threaded connection with the lever pin (23), and the limiting check ring (232) is tightly attached to the wire shearing lever (22).
7. The thread trimming mechanism for an overlock machine as claimed in claim 1, wherein: one section of the trimming lever bracket (24) is bent outwards and is far away from the rack (1), and the other section of the trimming lever bracket is fixed on the rack (1) through a fixing piece.
8. The thread trimming mechanism for an overlock machine as claimed in claim 1, wherein: and both ends of the trimming connecting rod (25) are respectively connected with the trimming lever (22) and the movable knife fixing rod (26) through bolts.
9. The thread trimming mechanism for an overlock machine as claimed in claim 1, wherein: the trimming connecting rod (25) is of an arc-shaped structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122135234.5U CN215947586U (en) | 2021-09-06 | 2021-09-06 | Thread trimming mechanism for overedger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122135234.5U CN215947586U (en) | 2021-09-06 | 2021-09-06 | Thread trimming mechanism for overedger |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215947586U true CN215947586U (en) | 2022-03-04 |
Family
ID=80428095
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122135234.5U Active CN215947586U (en) | 2021-09-06 | 2021-09-06 | Thread trimming mechanism for overedger |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215947586U (en) |
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2021
- 2021-09-06 CN CN202122135234.5U patent/CN215947586U/en active Active
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