CN210561135U - Needle bar grease proofing mechanism and sewing machine - Google Patents

Abstract

The utility model provides a grease proofing mechanism of needle bar, include: the outer needle bar of the first sleeve is fixedly arranged at the lower end of the sewing machine shell, the inner needle bar is inserted into the inner portion of the lower end of the outer needle bar, the lower end of the outer needle bar is lower than the upper end of the first sleeve, the first sleeve is positioned between the outer needle bar and the inner needle bar, the outer wall of the first sleeve is in friction contact with the inner wall of the outer needle bar, and the inner wall of the first sleeve is in clearance fit with the outer wall of the inner needle bar. A sewing machine is also provided. Compared with the prior art, the utility model has the advantages of: through the staggered layer structure between the outer needle rod, the inner needle rod and the first sleeve, the inner needle rod is isolated from the cavity space of the shell, and the phenomenon that lubricating oil in the oil absorption type oil-proof structure is difficult to absorb completely instantly and get rid of oil due to the poor long-time use effect of oil cotton is avoided.

Description

Needle bar grease proofing mechanism and sewing machine

Technical Field

The utility model relates to a sewing machine technical field especially relates to a grease proofing mechanism of needle bar and sewing machine.

Background

A sewing machine is a machine that uses one or more sewing threads to form one or more stitches in a material to be sewn, thereby interweaving or stitching one or more layers of material. The sewing machine can sew fabrics such as cotton, hemp, silk, wool, artificial fiber and the like and products such as leather, plastic, paper and the like, and the sewed stitches are neat, beautiful, flat and firm, the sewing speed is high, and the use is simple and convenient. At present, when a needle bar of a sewing machine reciprocates up and down, lubricating oil needs to be supplied to the needle bar to prevent the needle bar from influencing the motion of the needle bar due to frictional heat damage, but the lubricating oil on the needle bar is thrown out along with the high-speed motion of the needle bar to pollute sewing materials.

One of the traditional needle bar oil-proof structures is that oil returns felt arranged at the lower part of a needle bar bushing, an oil suction plate arranged at the lower surface of the oil return felt and a needle bar backflow cover are arranged, oil is forced to flow back by an oil pump, the oil contained in the needle bar backflow cover flows back by the oil suction plate along with the operation of the oil pump, and redundant oil of the needle bar is completely absorbed by the backflow felt and then is transferred to the oil pump, so that the oil leakage phenomenon is prevented. According to the technical scheme, the oil-proof effect is realized by mainly absorbing the lubricating oil on the needle rod, but the lubricating oil is difficult to be completely absorbed instantly when the needle rod moves at a high speed, so that the lubricating oil still can be thrown out of the extending part of the needle rod, the oil-proof effect is difficult to ensure, and the requirement on the suction force of the oil pump by forced oil return of the oil pump is high; the other kind is through increasing movable frizing oil blanket on annular oil cotton, scrapes partial oil along with needle bar up-and-down motion, siphons away by the oil cotton, and remaining few oil is directly siphoned away by the oil cotton, and the shortcoming of this scheme is that the life-span of activity oil blanket decides the quality of grease proofing effect, and this mechanism obviously can make the life-span of grease proofing oil blanket reduce, influences its grease proofing effect.

SUMMERY OF THE UTILITY MODEL

Based on this, the utility model discloses the first technical problem that will solve is to the above-mentioned problem that prior art exists, provides one kind and can guarantee the lubricated effect of needle bar, can follow the grease proofing mechanism of needle bar of solving the needle bar oil leak problem in the source again.

The utility model discloses the second technical problem that will solve is to the above-mentioned problem that prior art exists, provides one kind and can guarantee the lubricated effect of needle bar, can follow the sewing machine of solving the needle bar oil leak problem in the source again.

The utility model discloses a solve the technical scheme that first technical problem adopted and be: provided is a needle bar oil-proof mechanism including:

the first sleeve is fixedly arranged at the lower end of the sewing machine shell, and at least part of the first sleeve is positioned in the cavity of the shell;

the outer needle rod is sleeved outside the first sleeve in a sliding mode, the lower end of the outer needle rod is lower than the upper end of the first sleeve, and the lower end of the outer needle rod is hollow;

the upper end of the inner needle rod is inserted into the lower end of the outer needle rod, and the lower end of the inner needle rod extends downwards and extends out of the machine shell;

the first sleeve is positioned between the outer needle rod and the inner needle rod, the outer wall of the first sleeve is in friction contact with the inner wall of the outer needle rod, and the inner wall of the first sleeve is in clearance fit with the outer wall of the inner needle rod.

In one embodiment, the outer wall of the upper end of the first sleeve is provided with at least one oil storage groove. The oil storage groove is positioned in the axial stroke range of the outer needle rod, redundant lubricating oil can be temporarily accumulated in the oil storage groove in the axial reciprocating motion process of the outer needle rod, when the lubricating oil stored in the oil storage groove reaches a certain amount, the outer needle rod is moved upwards and the oil storage groove is exposed, the lubricating oil stored in the oil storage groove is released and slides down along the outer wall surface of the first sleeve under the action of gravity, and the lubricating between the inner wall of the outer needle rod and the outer wall of the first sleeve can be increased to a certain degree when the outer needle rod moves downwards.

In one embodiment, the number of the oil storage grooves is three, the three oil storage grooves are distributed at intervals along the axial direction of the first sleeve, the oil storage grooves are reasonable in structural distribution, and multiple oil prevention of the inner cavity of the outer needle rod can be achieved.

In one embodiment, the lower end of the outer needle rod is provided with a chamfer to facilitate scraping off excess lubricating oil on the outer wall surface of the first sleeve when the outer needle rod moves downwards.

In one embodiment, the first sleeve is sleeved with a sealing element on the bottom surface close to the cavity of the casing, so as to receive the lubricating oil scraped from the upper end of the outer wall of the first sleeve and prevent the lubricating oil from leaking out of the casing. The scraped lubricating oil falls on the sealing element, so that the lubricating oil can be prevented from leaking out of the shell along the outer wall of the first sleeve, and the oil leakage risk can be reduced. The sealing element is connected with an oil return mechanism arranged in the cavity of the machine shell, the oil return mechanism comprises a felt connected with the sealing element, an oil pipe connected with the felt and an oil pump used for driving oil to flow back, and the oil return mechanism is arranged in the cavity of the machine shell without additionally arranging an additional oil return pipeline.

In one embodiment, the sealing element comprises a taper oil seal, and the outer wall of the first sleeve is correspondingly provided with a taper surface matched with the taper oil seal. Through the cooperation of conical surface on toper oil blanket and the first sleeve for this toper oil blanket's structure is more firm, guarantees its sealed effect, and is favorable to lubricating oil on this oil blanket to be absorbed by the felt.

In one embodiment, the oil-proof mechanism for the needle bar further comprises a second sleeve fixedly arranged at the upper end of the sewing machine shell, the second sleeve is coaxial with the first sleeve and is spaced from the first sleeve, and the outer needle bar is sleeved in the second sleeve and is in friction contact with the second sleeve. The second sleeve sleeved on the upper end of the outer needle rod can further prevent oil mist from being thrown out of the machine shell and plays a role in guiding axial movement of the outer needle rod.

In one embodiment, the outer needle rod and the inner needle rod are fixedly connected in a split mode or are integrally formed. Specifically, the outer needle rod and the inner needle rod can be connected and fixed through a fastening screw, and can also be directly provided with an integrally formed structure.

In one embodiment, the outer diameter ratio of the outer needle rod to the inner needle rod is 2-3: 1, and the length ratio of the outer needle rod to the inner needle rod is 1-2: 1-2.

The utility model adopts the technical proposal of the second technical problem as follows, and provides a sewing machine, which comprises the needle bar oil-proof mechanism.

Compared with the prior art, the utility model has the advantages of: when the outer needle rod drives the inner needle rod to axially reciprocate, the inner needle rod is isolated from the cavity space of the machine shell through a staggered structure among the outer needle rod, the inner needle rod and the first sleeve, the lower end of the outer needle rod is lower than the upper end of the first sleeve, the outer needle rod is not separated from the first sleeve even if moving to the stroke top, and lubricating oil on the outer wall surface of the first sleeve is scraped by the outer needle rod under the action of friction force, so that the oil throwing phenomenon caused by the fact that the lubricating oil is difficult to be completely absorbed instantaneously and the long-time use effect of oil cotton is poor in an oil absorption type oil prevention structure is avoided; when the outer needle rod axially reciprocates, the first sleeve has a guiding function on the outer needle rod, so that the axial movement of the outer needle rod is more stable and reliable; the atomized oil in the cavity of the machine shell can well lubricate the outer needle rod and the first sleeve of the needle rod, and the lubricating effect of the needle rod is guaranteed.

Drawings

Fig. 1 is a schematic perspective view of a needle bar oil-proof mechanism according to a preferred embodiment of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1;

FIG. 3 is an enlarged view of a portion A of FIG. 2;

FIG. 4 is an exploded view of the oil-proof mechanism of the needle bar according to the preferred embodiment of the present invention;

FIG. 5 is an enlarged partial view of portion B of FIG. 4;

fig. 6 is a partially enlarged schematic view of a portion C in fig. 4.

Wherein the figures include the following reference numerals:

100-sewing machine needle bar grease proofing mechanism, 11-first sleeve, 111-oil groove, 112-conical surface, 12-outer needle bar, 121-chamfer, 122-first screw, 13-inner needle bar, 14-sealing element, 15-second sleeve, 16-driving element, 161-second screw, 17-needle group.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

It should be noted that the directions or positional relationships indicated by upper, lower, inner, outer, etc. are the directions or positional relationships shown in fig. 1 based on the drawings of the specification, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the indicated device or element must have a specific direction, be constructed and operated in a specific direction, and thus, should not be construed as limiting the present invention. The axial direction is based on the central axis of the needle bar, and in fig. 1, the axial direction extends in the vertical direction.

Referring to fig. 1 to 6, in order to provide a preferred embodiment of the present invention, the needle bar oil-proof mechanism 100 is disposed in a housing (not shown) of the head of the sewing machine, and the housing has a cavity. When the sewing machine works, in order to reduce friction heating and damage of parts and prolong the service life of the machine, atomized lubricating oil is filled in the cavity to lubricate the needle rod connecting rod crank, the needle rod assembly and the internal assembly. The current common lubrication mode is to plug oil line or oil cotton in the oil pipe, the oil line or oil cotton stored with lubricating oil contacts with the needle rod connecting rod when the needle rod connecting rod rotates to a high position along with the crank of the needle rod, then the needle rod connecting rod continues to move to throw out the oil for lubrication, when in specific use, one end of the oil line or oil cotton in the oil pipe contacts with oil liquid in other cavities of the machine, so that the oil line or oil cotton stores the oil liquid, under the condition that the machine runs at high speed (4000rpm), the needle rod connecting rod contacts with the other end of the oil line or oil cotton, the oil liquid is beaten into oil mist and thrown out along with the movement of the needle rod connecting rod, and the oil mist is scattered in.

The oil-proof mechanism 100 for the sewing machine needle bar of the preferred embodiment is to solve the problem of oil leakage of the needle bar from the source while ensuring the lubricating effect of the needle bar.

This grease proofing mechanism of needle bar 100 is including setting firmly in the first sleeve 11 of the casing lower extreme of sewing machine, slip the cover and locate the outer needle bar 12 outside first sleeve 11 and with outer needle bar 12 fixed connection's interior needle bar 13, the lower extreme of outer needle bar 12 is less than the upper end of first sleeve 11, the inside cavity of lower extreme of this outer needle bar 12, inside the lower extreme of locating outer needle bar 12 was inserted to the upper end of interior needle bar 13, the lower extreme downwardly extending of interior needle bar 13 stretches out outside the casing, this interior needle bar 13 axial runs through and unsettles in first sleeve 11. The first sleeve 11 is located between the outer needle rod 12 and the inner needle rod 13, the outer wall of the first sleeve is in friction contact with the inner wall of the outer needle rod 12, and the inner wall of the first sleeve 11 is in clearance fit with the outer wall of the inner needle rod 13.

In a preferred embodiment, the needle bar oil-proof mechanism 100 further includes a second sleeve 15 fixedly disposed at an upper end of the housing of the sewing machine, the second sleeve 15 is coaxial with the first sleeve 11 and is disposed at an interval, and the outer needle bar 12 is sleeved in the second sleeve 15 and is in frictional contact with the second sleeve 15.

The first sleeve 11 and the second sleeve 15 can guide the axial reciprocation of the outer needle rod 12. Preferably, the first sleeve 11 and the second sleeve 15 are fixed on the casing by glue, respectively, and the fixing mode is simple and reliable and has low cost. Wherein the first sleeve 11 extends at least partially within the cavity of the housing, but may also be located entirely within the housing cavity; the second sleeve 15 may also be located partially or wholly within the housing cavity.

The outer needle rod 12 is constrained between the first sleeve 11 and the second sleeve 15, and is not separated from the first sleeve 11 and the second sleeve 15 all the time during the high-speed axial reciprocating motion, and the first sleeve 11 and the second sleeve 15 have a guiding function on the outer needle rod 12, so that the axial motion of the outer needle rod is more stable and reliable.

In one embodiment, the outer needle rod 12 and the inner needle rod 13 are fixedly connected in a split manner, and as shown in fig. 2 and 4, the outer needle rod 12 and the inner needle rod 13 are fixedly connected through a first screw 122. In other embodiments, outer needle shaft 12 and inner needle shaft 13 may be provided directly as a one-piece structure for ease of manufacturing.

Preferably, the outer diameter ratio of the outer needle rod 12 to the inner needle rod 13 is 2-3: 1, and the section length ratio of the outer needle rod 12 to the inner needle rod 13 is 1-2: 1-2. Specifically, the outer diameter of the outer needle rod 12 is 7-12 mm, the wall thickness is 0.5-2 mm, the inner needle rod 13 is solid rod-shaped, and the outer diameter is 3-5 mm, and more preferably, the outer diameter of the outer needle rod 12 is 10mm, the wall thickness is 1mm, and the outer diameter of the inner needle rod 13 is 4 mm. In one embodiment, the length ratio of the sections of the outer needle rod 12 and the inner needle rod 13 is 1-2: 1-2, and in a preferred embodiment, the total length of the needle rods is 198 mm.

In one embodiment, the outer wall of the upper end of the first sleeve 11 defines at least one oil reservoir 111. The oil storage groove 111 is located in the stroke range of the axial reciprocating motion of the outer needle rod 12, when the outer needle rod 12 moves axially, redundant lubricating oil can be temporarily accumulated in the oil storage groove 111, when the lubricating oil stored in the oil storage groove 111 is accumulated to a certain amount, the lubricating oil stored in the oil storage groove can be released and slide down along the outer wall surface of the first sleeve 11 under the action of gravity under the condition that the oil storage groove 111 is exposed when the outer needle rod 12 moves upwards, the oil storage groove 111 can accumulate the lubricating oil scraped from bottom to top by the outer needle rod 12, a certain dredging effect on the lubricating oil is scraped, and in addition, the lubricating between the inner wall of the outer needle rod 12 and the outer wall of the first sleeve 11 can be further increased when the outer needle rod moves from top to bottom. In one embodiment, the oil storage grooves 111 are three and are distributed at intervals along the axial direction of the first sleeve 11, the oil storage grooves 111 are reasonably distributed in structure, multiple oil prevention of the inner cavity of the outer needle rod 12 can be realized, and the oil prevention effect is ensured.

In one embodiment, the lower end of the outer needle 12 has a chamfered portion 121 to facilitate scraping off excess lubricant from the outer wall surface of the first sleeve 11 when the outer needle 12 moves downward.

The first sleeve 11 is sleeved with a sealing member 14 near the bottom surface of the cavity of the housing for receiving the lubricant scraped from the upper end of the outer wall of the first sleeve 11 and preventing the lubricant from leaking out of the housing. The scraped-off lubricant falls onto the sealing element 14 and is prevented from leaking out of the casing along the outer wall of the first sleeve 11, reducing the risk of leakage of oil. In one embodiment, the seal 14 is connected to an oil return mechanism (not shown) disposed within the housing cavity. The oil return structure comprises a felt connected with the sealing element 14, an oil pipe connected with the felt and an oil pump used for driving oil to flow back, and the oil return structure is arranged in the cavity of the machine shell without additionally arranging an oil return pipeline. In one embodiment, the sealing element 14 may be a taper oil seal, the outer wall of the first sleeve 11 is correspondingly provided with a taper surface 112 adapted to the taper oil seal, and the taper oil seal is matched with the taper surface 112 on the first sleeve 11, so that the structure of the taper oil seal is more stable, the sealing effect of the taper oil seal is ensured, and the tapered inclined structure is favorable for guiding the lubricating oil on the oil seal to the felt and is absorbed by the felt.

Further, a driving member 16 for driving the outer needle shaft 12 to reciprocate axially is disposed in the cavity, and the driving member 16 includes a puncturing head (not shown) which is fixedly connected to the outer needle shaft 12 by a second screw 161. The lower end of the inner needle rod 13 extends downwards from the cavity of the machine shell and extends out of the cavity of the machine shell, and the lower end of the inner needle rod 13 is fixedly connected with the needle position group 17.

The utility model discloses a grease proofing process of sewing machine needle bar grease proofing mechanism 100 does:

the driving piece 16 drives the needle rod to do axial reciprocating motion through the binding head, wherein the upper end and the lower end of the outer needle rod 12 are respectively restrained by the first sleeve 11 and the second sleeve 15, and the inner wall of the lower end of the outer needle rod 12 is matched with the outer wall of the upper section of the first sleeve 11 and is in friction contact with the outer wall of the lower section of the first sleeve 11. During the downward movement of the outer needle rod 12, the chamfered part 121 at the lower end thereof scrapes oil downwards along the outer wall surface of the first sleeve 11, so that the excess oil stains adhered on the outer wall surface of the first sleeve 11 are scraped downwards and slide onto the sealing element 14 to be absorbed by the oil return mechanism, and the oil leakage of the machine shell is avoided to a great extent; during the upward movement of the outer needle rod 12, most of the lubricant on the outer wall surface of the first sleeve 11 is scraped off when the outer needle rod 12 moves downward, and a small amount of lubricant is carried into and accumulated in the oil reservoir 111 along with the upward movement of the outer needle rod 12, and does not continue to accumulate upward along with the upward movement of the outer needle rod 12. Even if a small amount of lubricant is brought above the oil reservoir 111, the lubricant will be stored in the oil reservoir 111 when the outer needle rod 12 moves downward, and as the outer needle rod 12 moves upward next time and the oil reservoir 111 is exposed, the excess lubricant will be released from the oil reservoir 111 and slide down the outer wall surface of the first sleeve 11. In the process, lubricating oil only exists between the inner wall of the outer needle rod 12 and the outer wall of the first sleeve 11, and the inner needle rod 13 is always in an isolated state with the cavity of the machine shell, so that the risk of oil throwing can be avoided fundamentally.

In one embodiment, a sewing machine including the needle bar oil-proof mechanism 100 is also provided.

The oilproof mechanism 100 of needle bar and sewing machine that above-mentioned embodiment provided, through the staggered layer structure between first sleeve 11 and outer needle bar 12 and the interior needle bar 13, keep apart interior needle bar 13 and casing cavity, lubricating oil on the first sleeve 11 outer wall is then scraped off under the frictional force effect, has avoided lubricating oil to be difficult to in the oilproof structure of oil absorption formula by the instant absorption completely, the long-time result of use variation of oil cotton and the oil phenomenon that gets rid of that leads to.

The fastening method provided by the above preferred embodiment is preferably a screw fastening method, but may also be a plug-in, welding, riveting or other fastening method commonly used in the art, and the preferred embodiment is merely an example and is not limited.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only represent some embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.

Claims (10)

1. A needle bar oil-proof mechanism (100) is characterized in that, comprising: a first sleeve (11) fixed at the lower end of the sewing machine casing, the first sleeve (11) at least partially located in the cavity of the casing; An outer needle rod (12) slidably sleeved outside the first sleeve (11), the lower end of the outer needle rod (12) is lower than the upper end of the first sleeve (11), the outer needle The lower end of the rod (12) is hollow inside; and an inner needle bar (13) fixedly connected with the outer needle bar (12), the upper end of the inner needle bar (13) is inserted inside the lower end of the outer needle bar (12), the inner needle bar (12) The lower end of (13) extends downward and out of the casing; Wherein, the first sleeve (11) is located between the outer needle shaft (12) and the inner needle shaft (13), and the outer wall of the first sleeve (11) is connected to the outer needle shaft (13). The inner wall of 12) is in frictional contact, and the inner wall of the first sleeve (11) and the outer wall of the inner needle rod (13) are in clearance fit. 2 . The needle bar oil-proof mechanism ( 100 ) according to claim 1 , wherein at least one oil storage groove ( 111 ) is formed on the outer wall of the upper end of the first sleeve ( 11 ). 3 . 3. The needle bar oil-proof mechanism (100) according to claim 2, wherein the number of the oil storage tanks (111) is three, and the three oil storage tanks (111) are along the first set of The axial directions of the cylinders (11) are spaced apart from each other. 4. The needle bar oil-proof mechanism (100) according to claim 2 or 3, wherein the lower end of the outer needle bar (12) has a chamfered portion (121). 5. The needle bar oil-proof mechanism (100) according to claim 1, wherein the first sleeve (11) is sleeved with a sealing member (14) on the bottom surface close to the cavity of the casing, the sealing The piece (14) is connected with the oil return mechanism arranged in the cavity of the casing. 6. The needle bar oil-proof mechanism (100) according to claim 5, wherein the seal (14) comprises a conical oil seal, and the outer wall of the first sleeve (11) is correspondingly provided with the The tapered surface (112) adapted to the tapered oil seal. 7. The needle bar oil-proof mechanism (100) according to claim 1, wherein the needle bar oil-proof mechanism (100) further comprises a second sleeve (15) fixed on the upper end of the sewing machine casing, The second sleeve (15) and the first sleeve (11) are coaxial and spaced apart, and the outer needle rod (12) is sleeved in the second sleeve (15) and is connected to the There is frictional contact between the second sleeves (15). 8 . The needle bar oil-proof mechanism ( 100 ) according to claim 1 , wherein the outer needle bar ( 12 ) and the inner needle bar ( 13 ) are in a separate fixed connection or integrally formed. 9 . 9. The needle bar oil-proof mechanism (100) according to claim 8, wherein the outer diameter ratio of the outer needle bar (12) and the inner needle bar (13) is 2-3:1, The section length ratio of the outer needle bar (12) and the inner needle bar (13) is 1-2:1-2. 10. A sewing machine, characterized by comprising the needle bar oil-proof mechanism (100) according to any one of claims 1 to 9.

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