CN212000159U - Needle bar assembly in sewing machine - Google Patents
Needle bar assembly in sewing machine Download PDFInfo
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- CN212000159U CN212000159U CN202020472026.7U CN202020472026U CN212000159U CN 212000159 U CN212000159 U CN 212000159U CN 202020472026 U CN202020472026 U CN 202020472026U CN 212000159 U CN212000159 U CN 212000159U
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- bushing
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- needle rod
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Abstract
The utility model provides a needle bar subassembly among sewing machine belongs to sewing machine technical field. The technical problems that the sewing machine is difficult to clean conveniently and effectively, and the thread and the hair of the lower bushing are easy to remove are solved. The needle rod assembly comprises a connecting seat, an upper bushing, a lower bushing and a needle rod, wherein the upper bushing and the lower bushing are fixedly arranged on a machine shell, the needle rod is slidably inserted into the upper bushing and the lower bushing, the needle rod is fixedly connected with the connecting seat, a sealing plug is fixedly arranged in the upper bushing, the upper end of the needle rod is inserted into the lower end of the upper bushing and is in sliding sealing connection with the upper bushing, and a cavity I is formed between the sealing plug and the upper end of the needle rod in; a sealing cover is sleeved on the needle rod above the lower bushing, and a cavity II is formed between the sealing cover and the lower bushing; the needle rod is internally provided with a cavity, the upper end face of the needle rod is provided with an opening communicated with the cavity I and the cavity, and the outer peripheral surface of the middle part of the needle rod is provided with a vent communicated to the cavity. The utility model discloses utilize self structural feature, convenient, effectual line hair that will be located the sealed cowling upper end outside is clear away, reduces the dead risk of equipment card.
Description
Technical Field
The utility model belongs to the technical field of sewing machine, a needle bar subassembly among sewing machine is related to.
Background
The sewing machine has the advantages that a lot of thread wool is accumulated at the head of the sewing machine due to long-time work, especially the thread wool near the needle bar and the lower lining of the needle bar is the most, the thread wool is brought into the lower lining by the movement of the needle bar in the sewing process, and the problem of thread wool clamping of the needle bar is caused.
The Chinese patent (publication number: CN 203807738U; publication date: 2014-09-03) discloses a dust suction device of a flat sewing machine, the flat sewing machine comprises a machine head, a needle rod and a presser foot rod, the needle rod and the presser foot rod are arranged in the machine head, the dust suction device of the flat sewing machine comprises a dust suction hose arranged in the machine head and a fan fixed on the side surface of the machine head, a dust suction port is arranged on the machine head around the needle rod, one end of the dust suction hose is connected with the dust suction port, the other end of the dust suction hose is connected with the fan, and the tail part of the fan is communicated with a dust suction bag for collecting flying dust; the dust collection hose is positioned in a space between the needle rod and the presser foot rod in the machine head; the dust absorption ports are circumferentially and uniformly distributed by taking the needle rod as the center.
The dust suction device of the flat sewing machine disclosed in the patent document needs an external air suction device to clean the thread hairs on the needle bar, which is troublesome; the thread hair of the upper lip of the lower bushing is most easily entered into the lower bushing, and the dust suction port of the dust suction hose is distributed on the periphery of the needle rod by taking the needle rod as the center and is not just opposite to the upper lip of the lower bushing, so that the thread hair at the upper end of the lower bushing is not thoroughly cleaned.
Disclosure of Invention
The utility model discloses to the above-mentioned problem that prior art exists, provide a needle bar subassembly among sewing machine, the utility model aims to solve the technical problem that: how convenient, effectual clearance easily get into the line hair of lower bush reduces because of the risk that the line hair gets into the dead equipment of lower bush card.
The purpose of the utility model can be realized by the following technical proposal:
a needle bar assembly in a sewing machine comprises a machine shell, wherein the needle bar assembly comprises a connecting seat, an upper bushing, a lower bushing and a needle bar, the upper bushing and the lower bushing are fixedly arranged on the machine shell, the needle bar is slidably inserted into the upper bushing and the lower bushing, the needle bar is fixedly connected with the connecting seat, a sealing plug is fixedly arranged in the upper bushing, the upper end of the needle bar is inserted into the lower end of the upper bushing and is in sliding and sealing connection with the lower end of the upper bushing, and a first cavity is formed between the sealing plug and the upper end of the needle bar in the upper bushing; a sealing cover is sleeved on the needle rod above the lower bushing, and a cavity II is formed between the sealing cover and the lower bushing; the needle rod is internally provided with a cavity, the upper end face of the needle rod is provided with an opening communicated with the cavity I and the cavity, and the middle part or the peripheral surface close to the lower end of the needle rod is provided with a vent communicated to the cavity.
The working principle is as follows: according to the technical scheme, the connecting seat drives the needle rod to move up and down, in the process that the needle rod moves from top to bottom, the volume of the cavity I is gradually increased from small to small, the cavity I is in a negative pressure state, air can enter the cavity of the needle rod from the vent hole, when the vent hole passes through the cavity II, the volume change of the cavity I is small and air intake is small, air pressure in the cavity II is not greatly changed, the needle rod moves downwards until the vent hole enters the lower bushing, and the cavity II is not influenced by the movement of the needle rod any more; the needle bar moves to the peak from the bottom to the top, the volume of the cavity I is minimized from the maximum, the cavity I is in the positive pressure state, when the vent hole moves to the cavity II, the air in the cavity I can be discharged to the cavity II through the vent hole, the air pressure in the cavity II can be rapidly increased to enable the cavity I to be in the positive pressure state, the air in the cavity II can be discharged outwards along the gap between the sealing cover and the needle bar, and then the line hair gathered on the upper surface of the sealing cover is blown away, the assembly prevents the line hair from falling on the upper end of the lower bushing by utilizing the structure of the assembly, the line hair on the outer side of the upper end of the sealing cover is conveniently and effectively cleaned, the probability that the line hair enters the lower bushing is reduced, and the risk that the equipment.
In the needle bar assembly of the sewing machine, the sealing cover is cylindrical, an end cover is arranged at the upper end of the sealing cover, a through hole is formed in the end cover, and the needle bar is inserted into the through hole in a sliding manner; the inner wall of the lower end of the sealing cover is attached to the outer peripheral surface of the upper end of the lower bushing. The sealing cover can prevent the line hair from falling on the lower liner, has the clearance between sealing cover and the needle bar, the free up-and-down motion of needle bar of being convenient for, but the clearance is very little, and the line hair can not get into the lower liner from the clearance, but the air current can upwards flow out from the clearance, blows away the line hair on the sealing cover, reduces the probability that the line hair got into the lower liner.
In the needle bar assembly of the sewing machine, lubricating grease is arranged in the cavity II. Lubricating grease can be fixed in the second cavity, and the lubricating grease in the second cavity can be attached to the inner walls of the needle rod and the lower bushing, so that the needle rod can move up and down more smoothly in the lower bushing.
In the needle bar assembly in the sewing machine, the upper bushing and the lower bushing are arranged at an upper interval and a lower interval, the connecting seat is located between the upper bushing and the lower bushing, an open slot is formed in the connecting seat, and the needle bar is inserted into the open slot of the connecting seat and locked through a locking screw. The connecting seat is fixedly connected with the needle rod and can drive the needle rod to move up and down and perform sewing.
In the needle bar assembly of the sewing machine, the outer peripheral surface of the upper bushing is provided with a locking screw hole, a locking screw is screwed in the locking screw hole, and the inner end of the locking screw abuts against the sealing plug. And the sealing plug is fixed in the upper liner by using a locking screw, so that the volume of the first cavity is in a stable range.
In the needle bar assembly of the sewing machine, the outer circumferential surface of the sealing plug is further provided with a plurality of air release grooves, and the air release grooves penetrate through the upper end surface and the lower end surface of the sealing plug. The air leakage groove is formed in the sealing plug, so that the volume change difference of the cavity is reduced, and the noise caused by the large volume change of the cavity can be avoided.
Compared with the prior art, the utility model discloses utilize self structure to form the air current in the needle bar up-and-down motion in-process to blow away the line hair that is located lip on the lower liner, have the advantage of the line hair of lip on the high-efficient, the convenient clearance lower liner, reduce the probability that the line hair got into the lower liner, also reduced because of the line hair gets into the risk of lower liner card equipment of dying.
Compared with the prior art, the utility model has the advantages of it is following:
1. the utility model discloses well sealed cowling can stop the line hair in its upper end outside, reduces the probability that the line hair got into the lower liner.
2. The utility model provides a needle bar subassembly utilizes self structural feature, makes two internal gas pressures of cavity increase and form ascending air current in the clearance of sealed cowling and needle bar, and the air current can effectually clear away the line hair that will pile up in the sealed cowling upper end outside, has reduced because of the risk that the line hair gets into the dead equipment of lower bush card.
Drawings
Fig. 1 is a schematic perspective view of a needle bar assembly in the sewing machine.
Fig. 2 is a sectional view of a needle bar assembly in the present sewing machine.
FIG. 3 is a schematic view showing the construction of the needle bar and the connecting holder in the needle bar assembly of the present sewing machine.
Fig. 4 is a front view of a needle bar in the needle bar assembly in the present sewing machine and a sectional view thereof at a-a.
FIG. 5 is a schematic view showing the structure of a seal cap in the needle bar assembly of the present sewing machine.
Fig. 6 is a schematic view showing the structure of a sealing plug in the needle bar assembly of the present sewing machine.
In the figure, 1, a housing; 2. a connecting seat; 2a, an open slot; 3. an upper bushing; 3a, locking screw holes; 4. a lower bushing; 5. a needle bar; 5a, a cavity; 5b, opening; 5c, vent holes; 6. a sealing plug; 6a, an air leakage groove; 7. a first cavity; 8. a sealing cover; 8a, an end cover; 8a1, vias; 9. a second cavity; 10. locking the screw; 11. and (5) tightening the screw.
Detailed Description
The following are specific embodiments of the present invention and the accompanying drawings are used to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.
As shown in fig. 1 to 6, the sewing machine of the present embodiment includes a housing 1, a needle bar assembly including a needle bar 5, a connecting seat 2 fixed on the needle bar 5, an upper bushing 3 and a lower bushing 4 fixed on the housing 1, the needle bar 5 slidably inserted in the upper bushing 3 and the lower bushing 4, the upper bushing 3 and the lower bushing 4 being spaced apart from each other up and down, the connecting seat 2 being located between the upper bushing 3 and the lower bushing 4, a sealing plug 6 being fixed in the upper bushing 3, the sealing plug 6 being located above an upper end of the needle bar 5, a cavity 7 being formed between the sealing plug 6 and an upper end of the needle bar 5 in the upper bushing 3, a plurality of air release grooves 6a passing through upper and lower sides of the sealing plug 6 being opened on an outer circumferential surface of the sealing plug 6, the plurality of air release grooves 6a being circumferentially spaced apart from each other on the sealing plug 6, a sealing cap 8 being fitted over the needle bar 5, the sealing cap 8 being cylindrical, the sealing cap 8 being fastened to the lower bushing, the upper end of the sealing cover 8 is provided with an end cover 8a, the end cover 8a is provided with a through hole 8a1, the needle rod 5 penetrates through the through hole 8a1, a gap is formed between the wall of the through hole 8a1 on the end cover 8a and the needle rod 5, the needle rod 5 can freely move up and down in the lower liner 4, but the gap is small, dust or thread hair cannot easily enter the lower liner 4 from the gap, a cavity II 9 is formed between the sealing cover 8 and the lower liner 4, lubricating grease is arranged in the cavity II 9, the needle rod 5 is internally provided with a cavity 5a, the upper end of the needle rod 5 is provided with an opening 5b communicating the cavity I7 with the cavity 5a, and the outer peripheral surface of the middle part or the part close to the lower end of the needle rod; when the needle rod 5 moves downwards, the volume of the cavity I7 is changed from small to large, the cavity I7 is in a negative pressure state, air enters the cavity 5a of the needle rod 5 through the vent hole 5c, when the vent hole 5c passes through the cavity II 9 in the downward movement process of the needle rod 5, the volume change of the cavity I7 is small, the air flowing into the needle rod 5 through the vent hole 5c is small, the air pressure change in the cavity II 9 is small, the needle rod 5 moves downwards again, the vent hole 5c enters the lower liner 4, and the movement of the needle rod 5 does not affect the cavity II 9 any more; when the needle bar 5 moves to the highest point from bottom to top, the volume of the cavity I7 is reduced from large to small, the cavity I7 is in a positive pressure state, when the needle bar 5 moves to the air vent 5c to pass through the cavity II 9, air in the cavity 5a in the needle bar 5 flows into the cavity II 9 through the air vent 5c, air pressure in the cavity II 9 is increased and forms positive pressure, air flow is formed, air is exhausted outwards along a gap between the sealing cover 8 and the needle bar 5, line hair gathered on the upper surface of the sealing cover 8 is blown away, the probability that the line hair enters the lower liner 4 is reduced, and the problem of blocking equipment is prevented.
Further, as shown in fig. 1 to 3, a locking screw hole 3a is formed in the outer peripheral surface of the upper bushing 3, a set screw 11 is screwed in the locking screw hole 3a, and the end of the set screw 11 is located in the upper bushing 3 and abuts against the side surface of the sealing plug 6; the connecting seat 2 is provided with an open slot 2a for the needle rod 5 to penetrate through, the connecting seat 2 is provided with a locking screw 10 for fixing the connecting seat 2 on the needle rod 5, and the connecting seat 2 can drive the needle rod 5 to move up and down to enable the needle rod 5 to perform reciprocating material pricking movement.
The specific embodiments described herein are merely illustrative of the spirit of the invention. 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 invention as defined in the appended claims.
Claims (6)
1. A needle bar assembly in a sewing machine comprises a machine shell (1), wherein the needle bar assembly comprises a connecting seat (2), an upper bushing (3) and a lower bushing (4) which are fixedly arranged on the machine shell (1), and a needle bar (5) which is slidably inserted into the upper bushing (3) and the lower bushing (4), the needle bar (5) is fixedly connected with the connecting seat (2), the needle bar assembly is characterized in that a sealing plug (6) is fixedly arranged in the upper bushing (3), the upper end of the needle bar (5) is inserted into the lower end of the upper bushing (3) and is in sliding sealing connection with the upper bushing (3), and a first cavity (7) is formed between the sealing plug (6) and the upper end of the needle bar (5) in the upper bushing (3); a sealing cover (8) is sleeved on the needle rod (5) above the lower bushing (4), and a second cavity (9) is formed between the sealing cover (8) and the lower bushing (4); the needle rod (5) is internally provided with a cavity (5a), the end face of the upper end of the needle rod (5) is provided with an opening (5b) communicated with the cavity I (7) and the cavity (5a), and the outer peripheral surface of the middle part or the lower end of the needle rod (5) is provided with a vent hole (5c) communicated to the cavity (5 a).
2. Needle bar assembly in a sewing machine according to claim 1, wherein the seal cover (8) is cylindrical and an end cap (8a) is provided at an upper end of the seal cover (8), a through hole (8a1) is opened on the end cap (8a), and the needle bar (5) is slidably inserted in the through hole (8a 1); the inner wall of the lower end of the sealing cover (8) is attached to the outer peripheral surface of the upper end of the lower bushing (4).
3. Needle bar assembly in a sewing machine according to claim 2, wherein grease is provided in the second cavity (9).
4. A needle bar assembly in a sewing machine according to claim 1, 2 or 3, wherein the upper bushing (3) and the lower bushing (4) are spaced apart from each other, the connecting seat (2) is located between the upper bushing (3) and the lower bushing (4), the connecting seat (2) has an opening groove (2a), and the needle bar (5) is inserted into the opening groove (2a) of the connecting seat (2) and locked by a locking screw (10).
5. A needle bar assembly in a sewing machine according to claim 1, 2 or 3, wherein the outer peripheral surface of the upper bushing (3) is provided with a locking screw hole (3a), a set screw (11) is screwed in the locking screw hole (3a), and the inner end of the set screw (11) abuts against the sealing plug (6).
6. A needle bar assembly in a sewing machine according to claim 1, 2 or 3, wherein the sealing plug (6) is further provided with a plurality of air release grooves (6a) on the outer peripheral surface thereof, and the air release grooves (6a) penetrate through the upper and lower end surfaces of the sealing plug (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020472026.7U CN212000159U (en) | 2020-04-02 | 2020-04-02 | Needle bar assembly in sewing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020472026.7U CN212000159U (en) | 2020-04-02 | 2020-04-02 | Needle bar assembly in sewing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212000159U true CN212000159U (en) | 2020-11-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020472026.7U Active CN212000159U (en) | 2020-04-02 | 2020-04-02 | Needle bar assembly in sewing machine |
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| Country | Link |
|---|---|
| CN (1) | CN212000159U (en) |
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2020
- 2020-04-02 CN CN202020472026.7U patent/CN212000159U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 318014 No. 1008, east section of Donghai Avenue, Sanjia, Jiaojiang District, Taizhou City, Zhejiang Province Patentee after: Jack Technology Co.,Ltd. Address before: 318014 No. 1008, east section of Donghai Avenue, Sanjia, Jiaojiang District, Taizhou City, Zhejiang Province Patentee before: JACK SEWING MACHINE Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |