JPH09164284A - Bearing structure for industrial sewing machines - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To prevent contamination of a sewn product due to abrasion powder even when a sliding portion is unlubricated or slightly lubricated. A bearing member (15) having at least a sliding surface (19) formed of a resin layer (22) made of resin, and a bearing that is slidably supported by the bearing member (15) and at least a part of which is exposed to the outside of the sewing machine body (2). Sliding surface 19 of member 15
A bearing member 13 capable of reciprocating in the vertical direction on a sliding surface 20 slidably abutting with the sliding surface 19 of the bearing member 15 and a sliding surface 20 of the bearing member 13. It is characterized by having an abrasion powder capturing member 23 impregnated with oil that adsorbs abrasion powder generated by movement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing for an industrial sewing machine, which is suitable for a needle bar device, a pressing device, etc., of which a part is exposed to the outside of a sewing machine main body, and which can prevent contamination of a sewn product due to abrasion powder. Regarding the structure.

[0002]

2. Description of the Related Art Generally, in a needle bar device and a presser device of an industrial sewing machine, a needle bar and a presser bar made of a metal material and reciprocating in a vertical direction are slidably held by using a metal bearing member. Bearing structure is used. In such a bearing structure, the sliding portion generates heat as the sewing machine operates at high speed, and this heat generation causes seizure damage (the needle bar or the presser bar is seized with the bearing and the needle bar or presser bar is There is a problem in that it may not operate), wear, or heat may occur.

Therefore, in order to prevent such seizure damage and wear, lubricating oil is used in the sliding portion of the bearing structure, but since the lubricating oil itself deteriorates due to heat generation, an oil supply means is provided. The lubricating oil is forcibly supplied to the sliding parts.

[0004]

However, the provision of the lubricating means for forcibly supplying the lubricating oil to the sliding parts of the needle bar device and the pressing device of the conventional industrial sewing machine complicates the sewing machine structure. In addition to increasing costs by increasing the number of parts and the number of parts, it is difficult to properly control the amount of lubricating oil (lubrication amount) supplied to sliding parts, and there is a large amount of lubricating oil for sliding parts. In this case, there is a problem that the sewn product may be contaminated with the lubricating oil. On the other hand, if the amount of oil supplied to the sliding portion is reduced by a small amount of oil or an oil mist, or grease lubrication, it may not be possible to reliably prevent seizure damage, wear, or heat generation. There was a point.

In order to deal with such problems as seizure damage and abrasion, for example, Japanese Patent Laid-Open No. 63-164 has been proposed.
Japanese Patent No. 993, Japanese Patent Laid-Open No. 2-109592, etc. have been proposed.

In the structure disclosed in the above-mentioned Japanese Patent Laid-Open No. 63-164993, either one of the drive shaft, which is the bearing member for the reciprocating motion of the sewing machine, and the bearing member that supports the drive shaft, is made of ceramics. Therefore, the sliding parts are oil-free. However, even when oil is not supplied from the ceramics, there is a problem that abrasion cannot be prevented and abrasion powder is generated to contaminate the sewn product. Further, in this publication, a groove is provided in at least one of the drive shaft and the bearing member, the groove is filled with lubricating oil, and the lubricant filled in the groove is prevented from leaking to the outside of the bearing member. Therefore, it has been proposed to provide a sealing device composed of an oil seal at both ends of the bearing member, but it is difficult to groove the ceramics due to the hardness and brittleness of the ceramic material. Therefore, there is a problem that the cost is high and it is not practical.

Further, the structure described in the above-mentioned Japanese Patent Laid-Open No. 2-109592 is a needle bar device of a sewing machine, in which the needle bar is
Forming a hard alumite coating on the surface of this base material using an aluminum alloy as the base material, and impregnating this hard alumite coating with tetrafluororesin or molybdenum disulfide,
By forming the bearing member that supports the needle bar from a polyimide-based or polyimide-amide-based resin, the sliding portion is oil-free. However, there is a problem in that a large amount of abrasion powder is generated at the sliding portion formed by the hard alumite and the resin bearing, and the abrasion powder is discharged to the outside of the bearing member to contaminate the sewing product. It was

The present invention has been made in view of these points, and a bearing structure for an industrial sewing machine capable of preventing contamination of a sewn product due to abrasion powder even when a sliding portion is unlubricated or slightly lubricated. The purpose is to provide.

[0009]

In order to achieve the above-mentioned object, the bearing structure for an industrial sewing machine of the present invention according to claim 1 is characterized in that at least the sliding surface is made of a resin layer. A formed bearing member and a reciprocating motion in the vertical direction slidably supported by the bearing member and exposed at least partially outside the sewing machine main body and slidably abutting the sliding surface of the bearing member. And a wear powder capturing member impregnated with oil that absorbs wear powder generated by sliding between the sliding surface of the bearing member and the sliding surface of the bearing member.

With such a structure, the sliding surface reciprocating in the vertical direction and the sliding surface formed of the resin layer made of resin are slid so that the sliding portion is oil-free. Alternatively, a small amount of oil can be supplied, and abrasion powder generated by sliding the sliding surface and the sliding surface by the abrasion powder capturing member can be adsorbed, so that the contamination of the sewn product by the abrasion powder can be surely performed. Can be prevented.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to an embodiment shown in the drawings.

1 and 2 show a first embodiment in which a bearing structure for an industrial sewing machine according to the present invention is used for a needle bar, and FIG. 1 is a perspective view showing a main part of the entire structure. 2 is an enlarged cross-sectional view of the main part.

As shown in FIG. 1, in the present embodiment, the sewing machine main body 2 of the industrial sewing machine 1 has a bed 3 arranged in the lower portion and a bed 3 in the upper portion as shown by the broken line in FIG. The sewing machine arm 4 is arranged in parallel,
The bed 3 and the sewing machine arm 4 are connected by a connecting portion 5 arranged on the right side of the bed 3, and are formed in a generally U-shaped front shape as a whole.

Inside the sewing machine arm 4, there is provided an upper shaft bearing 6 formed in a substantially cylindrical shape at a substantially central portion in the longitudinal direction, with its axis being substantially parallel to the bed 3. An upper shaft 7 is rotatably supported by the upper shaft bearing 6 so as to be substantially horizontal and substantially parallel to the bed 3. A pulley 8 is attached near the right end of the upper shaft 7, and a driving force of a drive motor arranged at the right end of the bed 3 is attached to the pulley 8 by a timing belt (both not shown). It is designed to be transmitted via.

A needle bar device 9 is provided near the left end of the upper shaft 7.
Are arranged. The needle bar device 9 includes a needle bar crank 10 and a needle bar crank rod 11 which are arranged on the upper shaft 7 in order from the pulley side, and a needle bar crank rod 11 which is vertically movable via a needle bar holder 12. Supported member 13
And the needle bar 14 as

Near the left end of the sewing machine arm 4, a pair of upper and lower needle bar bearings 16 are disposed as bearing members 15 that support the needle bar 14 vertically and vertically. Has been done. One of the pair of upper and lower needle bar bearings 16 shown above in FIG. 1 is a needle bar upper bearing 16a located entirely inside the left end portion of the sewing machine arm 4, and the other shown below in FIG. Has a lower end portion as a needle bar lower bearing 16b exposed to the outside of the sewing machine arm 4, that is, the sewing machine main body 2.

As shown in detail in FIG. 2, the needle bar 14 as the supported member 13 of the present embodiment is made of steel or metal such as aluminum alloy. In addition, in FIG. 2, a coating layer 18 made of ceramics having more excellent wear resistance is formed on the surface (outer peripheral surface) of the base material 17 of the needle bar 14. That is, the bearing member 1 that slides on the sliding surface 19a of the needle bar bearing 16 that is the sliding surface 19 of the bearing member 15 described later.
The sliding surface 20a of the needle bar 14, which is the sliding surface 20 of No. 3, is formed by the coating layer 18 made of ceramics. As the ceramic forming the coating layer 18, Ti is used.
Examples thereof include N, TiC, TiCN, CrN, DLC (diamond-like carbon) and the like.

In the needle bar bearing 16 as the bearing member 15 of the present embodiment, the resin layer 22 made of resin is formed on the surface (inner peripheral surface) of the base material 21 made of metal such as steel or aluminum alloy. It is composed of That is, the sliding surface 19a of the needle bar bearing 16 that is the sliding surface 19 of the bearing member 15 that slides with the sliding surface 20a of the needle bar 14 that is the sliding surface 20 of the bearing member 13 is made of resin. Layer 2
2 is formed. Examples of the resin forming the resin layer 22 include heat resistant resins such as polyimide resin and polyamide-imide resin.

That is, in the present embodiment, the sliding surface 20a formed by the coating layer 18 made of ceramics of the needle bar 14 and the sliding formed by the resin layer 22 made of resin of the needle bar bearing 16. The surface 19a enables high speed operation of the needle bar 14 in the oil-free state.

A small amount of oil or grease may be applied between the sliding surface 19a and the sliding surface 20 so that the amount of oil supplied is much smaller than before.

At the lower end portion of the needle bar lower bearing 16b exposed to the outside of the sewing machine main body 2, there is provided a wear powder catching member 23 formed in a substantially annular shape for catching wear powder. The wear debris trapping member 23 has a needle bar lower bearing 16b by a trapping member mounting body 24 having a substantially L-shaped cross section.
It is designed to be attached to the end face of the lower end of the. Also,
The capturing member mounting body 24 is attached by a plurality of setscrews 25 so as to surround the outer peripheral surface of the lower end portion of the needle bar lower bearing 16b.
It can be attached and removed by loosening.

That is, if necessary, the capturing member mounting body 24
The abrasion powder capturing member 23 can be easily replaced by attaching and detaching.

Since the inner surface of the abrasion powder trapping member 23 is in contact with the needle bar 14, a member that has a capillary phenomenon and does not damage the needle bar 14, such as felt or oil core,
A non-woven fabric, a resin sintered member, or the like is used as a material, and is formed by impregnating this material with oil, and wear powder discharged from the end of the needle bar bearing 16 that is the bearing member 15 to the outside is absorbed by the oil. It is ready to be captured.

Further, regarding the oil supply (impregnation) to the material of the friction capturing member 23, even if the oil is previously supplied to the material, the oil is supplied when the friction capturing member 23 is attached to the needle bar lower bearing 16b. However, after the friction capturing member 23 is attached to the needle bar lower bearing 16b, the sliding surface 19a of the needle bar lower bearing 16b is externally applied.
It may be supplied through a gap between the sliding surface 20a of the needle bar 14 and the sliding surface 20a.

The needle bar 14, the needle bar lower bearing 16b and the wear debris trapping member 23 constitute a bearing structure 26 for an industrial sewing machine according to this embodiment.

The friction catching member 23 may be attached to the lower needle bar bearing 16b by, for example, as shown in FIG. 3, an annular ring formed on the inner peripheral surface of the resin layer 22 at the lower end of the lower needle bar bearing 16b. A configuration in which a groove 27 is formed and the outer peripheral portion of the wear powder trapping member 23 formed in an annular shape is fitted into the groove 27, or, as shown in FIG. 4, is attached to the lower end portion of the needle bar lower bearing 16b in the axial direction. By providing a flange portion 28 extending in the longitudinal direction with a space in the longitudinal direction from the lower end surface of the sliding surface 19a formed by the resin layer 22 made of a resin, the inner peripheral surface of the lower end portion of the needle bar lower bearing 16a is provided. It is possible to select from various configurations such as a configuration in which an annular groove 29 is formed and the outer peripheral portion of the wear powder trapping member 23 formed in an annular shape is fitted into this groove 29. It is not limited to the wearing configuration.

Next, the operation of this embodiment having the above-mentioned structure will be described.

When the operation of the industrial sewing machine 1 of this embodiment is started, the driving force of the drive motor (not shown) is transmitted to the pulley 8 via the timing belt (not shown) to cause the upper shaft 7 to move.
However, for example, it is rotationally driven in the direction indicated by arrow A in FIG. The rotational movement of the upper shaft 7 is transmitted in the order of the needle bar crank 10, the needle bar crank rod 11, and the needle bar holder 12, and the needle bar 14 moves in the vertical direction as shown by a double-headed arrow B in FIGS. 1 and 2. Start a reciprocating motion. And the needle bar 14
Of the needle bar 14 by the reciprocating movement of the needle bar in the vertical direction.
0a slides against the sliding surfaces 19a of the pair of upper and lower needle bar bearings 16 to cause wear.

In this embodiment, the sliding surface 20a of the needle bar 14 and the sliding surface 19a of the needle bar bearing 16, that is,
Sliding surface 20 (formed by coating layer 18 made of ceramics in the figure) and resin layer 2 made of resin
By sliding on the sliding surface 19 formed by No. 2, it is possible to prevent seizure damage when the sliding portion is oil-free or a small amount of oil is supplied, and a much smaller amount of oil supply than that of the prior art or no oil supply is possible. Although it is possible to perform high-speed movement in a lubricated state and prevent contamination of a sewn product with conventional lubricating oil, wear of the sliding surface 19a formed by the resin layer 22 of the needle bar bearing 16 and especially initial wear is prevented. This cannot be prevented, and if it is left as it is, the sewn product is contaminated by wear powder generated by wear, particularly wear powder generated by initial wear, and the commercial value of the sewing machine is reduced.

However, in the present embodiment, a wear debris trapping member 23 containing oil is disposed at the lower end of the needle bar lower bearing 16b, and the debris trapping member 23 causes the needle bar lower bearing to move. Since the oil content impregnated with the abrasion powder discharged from the lower end of 16b toward the sewing article (not shown) located on the upper surface of the bed 3 can be surely adsorbed and captured, the contamination of the sewing article by the abrasion powder can be prevented. It can be reliably prevented, and the product value of the sewing machine can be surely improved.

It should be noted that if abrasion powder is continuously adsorbed by the abrasion powder capturing member 23, the abrasion powder capturing member 23 may be clogged. Although it seems to be a large amount from the viewpoint of its effect on objects, it is small quantitatively and hardly clogs when using a sewing machine. That is, the industrial sewing machine 1 of the present embodiment
When the durability test of the wear debris trapping member 23 was performed using
Continuous operation 300 to 5 corresponding to general one-year usage time
It was found that no clogging occurred in the continuous operation for 00 hours. However, in the present embodiment, assuming that the abrasion dust capturing member 23 is clogged, the abrasion dust capturing member 23 can be easily replaced.

In addition, the generation of wear powder in the bearing structure 26 for an industrial sewing machine according to the present embodiment is caused by the sliding surface 20.
And a sliding surface 1 formed by a resin layer 22 made of resin
Almost all of this is caused by the initial wear until the sliding surface 20 and the sliding surface 19 become compatible with each other when the sliding contact with the sliding surface 9 occurs, and the abrasion powder generated by this initial wear is discharged to the outside. It has been empirically proved that the prevention can prevent the contamination of the sewn product due to the abrasion powder.

The abrasion powder is discharged from the upper end portion of the needle bar lower bearing 16b, the upper end portion and the lower end portion of the needle bar upper bearing 16a, and the upper end portion of the needle bar lower bearing 16b and the needle bar upper bearing. Since the upper end and the lower end of 16a are located inside the sewing machine main body 2, wear powder is not discharged to the outside of the sewing machine main body 2, and the upper end of needle bar lower bearing 16b and needle bar upper bearing 16b are not discharged. The wear debris trapping member 23 is provided at the upper and lower ends of 16a.
Although not necessarily required, the wear debris trapping member 23 is arranged on the upper end portion of the needle bar lower bearing 16b located inside the sewing machine main body 2 and on the upper end portion and the lower end portion of the needle bar upper bearing 16a as necessary. There is no denying that it is installed.

FIG. 5 is an enlarged cross-sectional view of an essential part showing a second embodiment in which the bearing structure for an industrial sewing machine according to the present invention is used for a needle bar.

As shown in FIG. 5, the industrial sewing machine bearing structure 26A of the present embodiment is wholly made of a resin layer instead of the needle bar lower bearing 16b as the bearing member 15 of the first embodiment. Needle bar lower bearing 16ba formed by only 22
Is used. Other configurations are the same as those of the industrial sewing machine bearing structure 26 of the first embodiment described above.

The industrial sewing machine bearing structure 26A of the present embodiment having such a structure has the same effects as the industrial sewing machine bearing structure 26 of the first embodiment described above.

FIGS. 6 and 7 show a third embodiment in which a bearing structure for an industrial sewing machine according to the present invention is used for a presser bar, and FIG. 6 is a perspective view showing a main part of the entire structure. ,
FIG. 7 is an enlarged cross-sectional view of the main part. It should be noted that the same or corresponding configurations as those of the above-described embodiment are designated by the same reference numerals in the drawings, and the description thereof will be omitted.

As shown in FIG. 6, in the present embodiment, a holding device 30 is arranged near the left end portion of the sewing machine arm 4 shown by the broken line in FIG. This presser device 3
0 has a presser bar 31 as a supported member 13 whose lower end is exposed to the outside of the sewing machine main body 2.
Reference numeral 1 denotes a bearing member 15 disposed inside the left end portion of the sewing machine arm 4 such that the lower end portion thereof projects from the sewing machine arm 4 toward the bed 3, that is, is exposed to the outside of the sewing machine body 2. The barrel presser bar bearing 32 and the presser bar guide 34 fixed by tightening the presser adjusting screw 33 inside the sewing machine arm 4 enable reciprocal movement in the vertical direction indicated by a double-headed arrow C in FIGS. 6 and 7. It is supported and arranged. A presser foot 36 is attached to the lower end of the presser bar 31 and is urged downward by a presser foot adjusting spring 37. Then, the movements of a well-known presser foot lifting and knee lifter (not shown) are transmitted to the presser bar 31 via the presser bar hanger 35 so that the presser bar 31 is vertically moved.

As shown in detail in FIG. 7, the holding bar 31 as the supported member 13 of the present embodiment is made of steel, aluminum alloy or the like, like the needle bar 14 of the first embodiment described above. It is made of metal. In FIG. 7, the coating layer 18 made of ceramics having more excellent wear resistance is formed on the surface (outer peripheral surface) of the base material 38 of the presser bar 31. That is, the sliding surface 20b that slides with the sliding surface 19b of the presser bar bearing 32, which is the sliding surface 19 of the bearing member 15, which will be described later.
Is formed of a coating layer 18 made of ceramics.

Further, the holding bar bearing 32 as the bearing member 15 of the present embodiment is similar to the needle bar lower bearing 16b of the first embodiment described above in that the base material made of metal such as steel or aluminum alloy is used. The resin layer 22 made of a resin is formed on the surface (inner peripheral surface) of 39. That is, the pressing rod 3 that is the sliding surface 20 of the bearing member 13
Sliding surface 1 of the bearing member 15 that slides on the sliding surface 20b of No. 1
The sliding surface 19b of the 9 barrel presser bar bearing 32 is formed of a resin layer 22 made of resin.

That is, in the present embodiment, the sliding surface 20b formed by the covering layer 18 made of ceramics of the presser bar 31 and the sliding formed by the resin layer 22 made of resin of the presser bar bearing 32. The surface 19b makes it possible to operate the presser bar 31 at high speed without oil supply.

At the lower end portion of the presser bar bearing 32 exposed to the outside of the sewing machine main body 2, the wear debris trapping member 23 is arranged, as in the needle bar lower bearing 16a of the first embodiment described above. Has been done.

The presser bar 31, the presser bar bearing 32, and the abrasion powder capturing member 23 constitute a bearing structure 26B for an industrial sewing machine according to this embodiment.

Other configurations are the same as those of the industrial sewing machine bearing structure 26 of the first embodiment described above.

The industrial sewing machine bearing structure 26B of the present embodiment having such a structure has the same effects as the industrial sewing machine bearing structures 26, 26A of the above-described embodiments.

FIG. 8 is an enlarged cross-sectional view of an essential part showing a fourth embodiment in which the bearing structure for an industrial sewing machine according to the present invention is used as a presser bar.

As shown in FIG. 8, the industrial sewing machine bearing structure 26C according to the present embodiment includes only the resin layer 22 in place of the presser bar bearing 32 as the bearing member 15 according to the third embodiment. The formed presser bar bearing 32a is used. Other configurations are the same as those of the industrial sewing machine bearing structure 26B of the third embodiment described above.

The industrial sewing machine bearing structure 26C of the present embodiment having such a structure has the same effects as the industrial sewing machine bearing structures 26, 26A and 26B of the above-described respective embodiments.

The present invention is not limited to the above-described embodiment, and for example, instead of the coating layer made of the above ceramics, a coating layer made of an electroless nickel boron plating layer or a composite nickel phosphorus plating layer. Etc. can be changed as necessary.

[0050]

As described above, according to the bearing structure for an industrial sewing machine of the present invention, wear powder is not discharged to the outside even when the sliding portion is oil-free or a small amount of oil is supplied. This has an extremely excellent effect that it is possible to reliably prevent the contamination of the sewn product.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an essential part of the overall configuration of a first embodiment in which a bearing structure for an industrial sewing machine according to the present invention is used for a needle bar.

FIG. 2 is an enlarged sectional view of a main part of FIG. 1;

FIG. 3 is an enlarged cross-sectional view of a main part showing a modified example of the attachment structure of the friction trapping member of FIG.

FIG. 4 is a view similar to FIG. 3 showing another modification of the attachment structure of the friction trapping member of FIG. 1.

FIG. 5 is an enlarged cross-sectional view showing a main part of a second embodiment in which a bearing structure for an industrial sewing machine according to the present invention is used for a needle bar.

FIG. 6 is a perspective view showing an essential part of the overall configuration of a third embodiment in which the bearing structure for an industrial sewing machine according to the present invention is used as a presser bar.

7 is an enlarged cross-sectional view of the main part of FIG.

FIG. 8 is an enlarged cross-sectional view showing a main part of a fourth embodiment in which the bearing structure for an industrial sewing machine according to the present invention is used as a presser bar.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Industrial sewing machine 2 Sewing machine main body 9 Needle bar device 13 Bearing member 14 Needle bar 15 (as a bearing member) Bearing member 16 Needle bar bearing 16b (as a bearing member) Lower needle bar bearing 18 Coating layer 19, 19a, 19b Sliding surface 20, 20a, 20b Sliding surface 22 Resin layer 23 Wear powder capturing member 26, 26A, 26B, 26C Bearing structure for industrial sewing machine 31 Presser bar 32 (as bearing member) Presser 32 (as bearing member) Bar bearing

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Akinori Marumoshi 1-2 Kokuryo-cho, Chofu-shi, Tokyo 1 Juki Co., Ltd. (72) Inventor Tomochi Ichikawa 8--2 Kokuryo-cho, Chofu-shi, Tokyo 1 Within Juke Corporation

Claims (1)

[Claims] 1. A bearing member, at least a sliding surface of which is formed of a resin layer made of resin, and a bearing member slidably supported by the bearing member, at least a part of which is exposed to the outside of the sewing machine main body. A bearing member slidably abutting the surface and capable of reciprocating in the vertical direction, and adsorbing abrasion powder generated by sliding between the sliding surface of the bearing member and the sliding surface of the bearing member. A bearing structure for an industrial sewing machine, comprising: an abrasion powder capturing member impregnated with oil.