JP3814002B2 - Bearing structure for industrial sewing machines - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a bearing structure for an industrial sewing machine capable of preventing contamination of a sewing product with wear powder suitable for a needle bar device, a presser device, or the like that is partially exposed to the outside of a sewing machine body.
[0002]
[Prior art]
In general, a needle bar device or a presser device of an industrial sewing machine uses a bearing structure that is formed of a metal material and that reciprocates in a vertical direction and holds the presser bar slidably using a metal bearing member. It has been. In such a bearing structure, the sliding part generates heat during high-speed operation of the sewing machine, and seizure damage (the needle bar or presser bar etc. is seized with the bearing due to this heat generation and the needle bar or presser bar etc. It may not be able to operate), wear, or heat may occur.
[0003]
Therefore, in order to prevent such seizure damage and wear, lubricating oil is used for the sliding portion of the bearing structure, but the lubricating oil itself deteriorates due to heat generation. A configuration for forcibly supplying lubricating oil to the part is used.
[0004]
[Problems to be solved by the invention]
However, providing oil supply means for forcibly supplying lubricating oil to sliding parts of conventional industrial sewing machine needle bar devices and presser devices leads to a complicated sewing machine structure and an increased number of parts. In addition to increasing the cost, it is difficult to properly control the amount of lubricating oil supplied to the sliding part (oil supply amount). There was a problem that it may contaminate. Conversely, there is a problem that seizure damage, wear, or heat generation may not be reliably prevented if the amount of oil supplied to the sliding part is reduced by a small amount of lubrication or grease lubrication using an oil core or oil mist. There was a point.
[0005]
In order to cope with problems such as seizure damage and wear, for example, Japanese Patent Laid-Open Nos. 63-164993 and 2-109592 have been proposed.
[0006]
The configuration described in Japanese Patent Laid-Open No. 63-164993 has a structure in which either one of a drive shaft as a supported member for reciprocating movement of a sewing machine and a bearing member for supporting the drive shaft is formed of ceramics. The part is not lubricated. However, even when no lubrication is made with ceramics, there is a problem in that wear cannot be prevented, and wear powder is generated to contaminate the sewing product. In the 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 outside the bearing member. For this reason, there has been proposed a seal device comprising an oil seal at both ends of a bearing member. However, it is difficult to groove a ceramic material due to characteristics such as hardness and brittleness of the ceramic material. At the same time, there was a problem of high cost and impracticality.
[0007]
Further, the configuration described in the above-mentioned Japanese Patent Application Laid-Open No. 2-109592 is a sewing needle bar device in which a needle bar is made of an aluminum alloy as a base material and a hard anodized film is formed on the surface of the base material. This is formed by impregnating with tetrafluoride resin or molybdenum disulfide, and the bearing member for supporting the needle bar is made of polyimide or polyimide amide resin, so that the sliding portion is oil-free. However, there is a problem in that a large amount of wear powder is generated at the sliding portion formed by the hard anodized and the resin bearing, and this wear powder is discharged to the outside of the bearing member and contaminates the sewing product. It was.
[0008]
The present invention has been made in view of these points, and provides a bearing structure for an industrial sewing machine capable of preventing contamination of a sewing product due to wear powder even when the sliding portion is oil-free or minute oil supply. For the purpose.
[0009]
[Means for Solving the Problems]
In order to achieve the above-described object, the industrial sewing machine bearing structure according to claim 1 of the present invention is characterized by a bearing member having at least a sliding surface formed of a resin layer made of a resin, and the bearing. A bearing member that is slidably supported by the member and that is at least partially exposed to the outside of the sewing machine body and is slidably contacted with the sliding surface of the bearing member; The wear powder impregnated with oil that adsorbs the wear powder generated by sliding between the sliding surface of the bearing member and the sliding surface of the bearing member , disposed at the lower end exposed to the outside of the sewing machine body It has a capture member. The wear powder capturing member is attached to the end surface of the lower end portion of the bearing member by a capturing member mounting body having a substantially L-shaped cross section, and the capturing member mounting body is connected to the bearing member by a plurality of set screws. It is attached so that the outer peripheral surface of a lower end part may be surrounded, and it is preferred that the above-mentioned capture member attachment object is made detachable by loosening said plurality of set screws, and further, said bearing member is A needle bar or a presser bar is preferable.
[0010]
With such a configuration, the sliding portion is made non-lubricated or minutely lubricated by sliding the sliding surface reciprocating in the vertical direction and the sliding surface formed by the resin layer made of resin. Since the wear powder generated by sliding the sliding surface and the sliding surface by the wear powder capturing member can be adsorbed, the contamination of the sewing product by the wear powder is surely prevented. be able to.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
[0012]
1 and 2 show a first embodiment in which a bearing structure for an industrial sewing machine according to the present invention is used as a needle bar, and FIG. 1 is a perspective view showing a main part of the overall configuration. FIG. 3 is an enlarged cross-sectional view of a main part.
[0013]
As shown in FIG. 1, in the present embodiment, the sewing machine body 2 of the industrial sewing machine 1 is provided with a bed 3 in the lower part and parallel to the bed 3 in the upper part, as indicated by a broken line in FIG. 1. A sewing arm 4 is provided, and the bed 3 and the sewing machine arm 4 are connected by a connecting portion 5 provided on the right side of the bed 3 and are formed in a substantially U-shape on the front as a whole.
[0014]
Inside the sewing machine arm 4, an upper shaft bearing 6 formed in a substantially cylindrical shape at a substantially central portion in the longitudinal direction thereof is disposed with its axis substantially parallel to the bed 3. 6, the upper shaft 7 is supported so as to be rotatable in a substantially horizontal manner substantially parallel to the bed 3. A pulley 8 is attached in the vicinity of the right end portion of the upper shaft 7, and a driving force of a drive motor disposed at the right end portion of the bed 3 is attached to the pulley 8 with a timing belt (both not shown). To be transmitted through.
[0015]
Near the left end of the upper shaft 7, a needle bar device 9 is disposed. This needle bar device 9 is arranged in order from the pulley side to a needle bar crank 10 and a needle bar crank rod 11 arranged on the upper shaft 7, and to the needle bar crank rod 11 so as to be movable up and down via a needle bar holder 12. And a needle bar 14 as the supported member 13.
[0016]
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 so as to be vertically reciprocable in the vertical direction. . One of the pair of upper and lower needle bar bearings 16 shown in the upper part in FIG. 1 is a needle bar upper bearing 16a located entirely inside the left end of the sewing machine arm 4, and the other shown in the lower part in FIG. The lower end portion of the sewing machine arm 4 is a needle bar lower bearing 16 b exposed to the outside of the sewing machine body 2.
[0017]
As shown in detail in FIG. 2, the needle bar 14 as the bearing member 13 of the present embodiment is made of a metal such as a steel material or an aluminum alloy. In FIG. 2, a coating layer 18 made of ceramics having higher wear resistance is formed on the surface (outer peripheral surface) of the base material 17 of the needle bar 14. That is, the sliding surface 19a of the needle bar bearing 16 as the sliding surface 19 of the bearing member 15 and the sliding surface 20a of the needle bar 14 as the sliding surface 20 of the bearing member 13 that slides are made of ceramics. The covering layer 18 is formed. Examples of the ceramic forming the coating layer 18 include TiN, TiC, TiCN, CrN, DLC (diamond-like carbon), and the like.
[0018]
Further, the needle bar bearing 16 as the bearing member 15 of the present embodiment is configured by forming a resin layer 22 made of a resin on the surface (inner peripheral surface) of a base material 21 made of a metal such as a steel material or an aluminum alloy. Has been. That is, the sliding surface 19a of the needle bar bearing 16 which is the sliding surface 19 of the bearing member 15 which slides with the sliding surface 20a of the needle bar 14 which is the sliding surface 20 of the bearing member 13 is made of resin. It is formed by the layer 22. Examples of the resin that forms the resin layer 22 include heat-resistant resins such as polyimide resins and polyamideimide resins.
[0019]
That is, in this embodiment, the sliding surface 20a formed by the coating layer 18 made of ceramics of the needle bar 14 and the sliding surface 19a formed by the resin layer 22 made of resin of the needle bar bearing 16 Thus, the needle bar 14 can be operated at high speed in an oil-free state.
[0020]
In addition, it is good also as a structure which applies the trace amount lubrication or grease lubrication with much less oil supply than before between the sliding surface 19a and the sliding surface 20. FIG.
[0021]
At the lower end of the needle bar lower bearing 16b exposed to the outside of the sewing machine main body 2, a wear powder capturing member 23 formed in a substantially annular shape for capturing the wear powder is disposed. The powder capturing member 23 is attached to the end surface of the lower end portion of the needle bar lower bearing 16b by a capturing member mounting body 24 having a substantially L-shaped cross section. The capture member mounting body 24 is attached so as to surround the outer peripheral surface of the lower end portion of the needle bar lower bearing 16b by a plurality of set screws 25, and the capture member mounting body 24 loosens each set screw 25. It is possible to attach and detach.
[0022]
That is, the wear powder capturing member 23 can be easily replaced by attaching and detaching the capturing member mounting body 24 as necessary.
[0023]
Since the inner peripheral surface of the wear powder capturing member 23 is in contact with the needle bar 14, a material that has a capillary phenomenon and does not damage the needle bar 14, such as a felt, an oil core, a nonwoven fabric, a resin sintered member, or the like, is used. In addition, this material is formed by impregnating an oil component, so that wear powder discharged to the outside from the end of the needle bar bearing 16 as the bearing member 15 can be captured by the adsorption force of the oil component. Yes.
[0024]
Further, the supply (impregnation) of the oil to the material of the friction capture member 23 may be performed by supplying the oil to the material in advance or supplying the oil when the friction capture member 23 is attached to the needle bar lower bearing 16b. After the friction capture member 23 is attached to the needle bar lower bearing 16b, it may be supplied from the outside through a gap between the sliding surface 19a of the needle bar lower bearing 16b and the sliding surface 20a of the needle bar 14.
[0025]
The needle bar 14, the needle bar lower bearing 16b, and the wear powder capturing member 23 constitute the industrial sewing machine bearing structure 26 of the present embodiment.
[0026]
Further, as a configuration for attaching the friction capture member 23 to the needle bar lower bearing 16b, for example, as shown in FIG. 3, an annular groove 27 is formed on the inner peripheral surface of the resin layer 22 at the lower end of the needle bar lower bearing 16b. The outer periphery of the wear powder capturing member 23 formed in an annular shape in this groove 27 is fitted, and as shown in FIG. 4, the lower end of the needle bar lower bearing 16b extends in the axial direction. An annular groove is formed in the inner peripheral surface of the lower end portion of the needle bar lower bearing 16a by providing the flange portion 28 to be spaced apart in the longitudinal direction from the lower end surface of the sliding surface 19a formed by the resin layer 22 made of resin. 29, and can be selected from various configurations such as a configuration in which the outer peripheral portion of the wear powder capturing member 23 formed in an annular shape in the groove 29 is fitted, and in particular, in the mounting configuration of the present embodiment. It is not limited.
[0027]
Next, the operation of the present embodiment configured as described above will be described.
[0028]
When the operation of the industrial sewing machine 1 according to the present embodiment is started, the driving force of a drive motor (not shown) is transmitted to the pulley 8 via a timing belt (not shown) so that the upper shaft 7 is moved by an arrow A in FIG. Rotate in the direction shown. 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 indicated by the double arrow B in FIGS. Start reciprocating motion. As the needle bar 14 reciprocates in the vertical direction, the sliding surface 20a of the needle bar 14 slides between the sliding surfaces 19a of the pair of upper and lower needle bar bearings 16 to cause wear.
[0029]
In the present embodiment, the sliding surface 20a of the needle bar 14 and the sliding surface 19a of the needle bar bearing 16, that is, the sliding surface 20 (in the figure, formed by a coating layer 18 made of ceramics). And sliding surface 19 formed by resin layer 22 made of resin, it is possible to prevent seizure damage when the sliding part is oil-free or a small amount of oil supply, and much more than before. Although the high-speed movement is possible with a small amount of oil supply or no oil supply, and contamination of the sewing product by conventional lubricating oil can be prevented, the wear of the sliding surface 19a formed by the resin layer 22 of the needle bar bearing 16 In particular, the initial wear cannot be prevented, and if it remains as it is, the contamination of the sewing product is caused by the wear powder generated by the wear, particularly the wear powder generated by the initial wear. Value is lowered.
[0030]
However, in the present embodiment, a wear powder capturing member 23 containing oil is disposed at the lower end of the needle bar lower bearing 16b, and the wear powder capturing member 23 allows the lower end of the needle bar lower bearing 16b to be disposed. Since it can be reliably adsorbed and captured by the oil impregnated with the wear powder discharged toward the sewing product (not shown) located on the upper surface of the bed 3 from the section, contamination of the sewing product by the wear powder is surely prevented. This can surely improve the commercial value of the sewing machine.
[0031]
It is presumed that if the wear powder is continuously adsorbed by the wear powder catching member 23, the wear powder catching member 23 is clogged. However, the generated amount of wear powder is given to the sewn product when attached to the sewn product. From the viewpoint of influence, it seems to be a large amount, but it is quantitatively small, and clogging hardly occurs when using the sewing machine. That is, when the wear powder capturing member 23 was subjected to an endurance experiment using the industrial sewing machine 1 of the present embodiment, clogging occurred in a continuous operation of 300 to 500 hours corresponding to a general one-year use time. Turned out not to be. However, in the present embodiment, assuming that the wear powder capturing member 23 is clogged, the wear powder capturing member 23 can be easily replaced.
[0032]
In addition, the generation of wear powder in the industrial sewing machine bearing structure 26 in the present embodiment occurs when the sliding surface 20 and the sliding surface 19 formed by the resin layer 22 made of resin slide. Most of the wear is caused by the initial wear until the slide surface 20 and the slide surface 19 become familiar. By preventing the wear powder generated by the initial wear from being discharged to the outside, the sewn product of the wear powder is sewn. Experiments have shown that contamination of the water can be reliably prevented.
[0033]
The wear powder is also discharged from the upper end portion of the needle bar lower bearing 16b and the upper end portion and lower end portion of the needle bar upper bearing 16a. The upper end portion of the needle bar lower bearing 16b and the upper end of the needle bar upper bearing 16a The upper and lower ends of the needle bar lower bearing 16b and the upper end of the needle bar upper bearing 16a are not discharged to the outside of the sewing machine main body 2 because the upper and lower ends are located inside the sewing machine main body 2. It is not always necessary to provide the wear powder capturing member 23 at the upper and lower ends, but if necessary, the wear powder capturing member 23 may be mounted on the upper end of the needle bar lower bearing 16b located inside the sewing machine body 2 or on the needle bar. It is not denied that the bearings 16a are disposed at the upper end and the lower end.
[0034]
FIG. 5 is an enlarged cross-sectional view of a main part showing a second embodiment in which the industrial sewing machine bearing structure according to the present invention is used for a needle bar.
[0035]
As shown in FIG. 5, the industrial sewing machine bearing structure 26 </ b> A of the present embodiment is entirely composed of only the resin layer 22 instead of the needle bar lower bearing 16 b as the bearing member 15 of the first embodiment described above. The formed needle bar lower bearing 16ba is used. Other configurations are the same as those of the industrial sewing machine bearing structure 26 of the first embodiment.
[0036]
The industrial sewing machine bearing structure 26A of the present embodiment having such a configuration has the same effects as the industrial sewing machine bearing structure 26 of the first embodiment described above.
[0037]
6 and 7 show a third embodiment in which the industrial sewing machine bearing structure according to the present invention is used as a presser bar, and FIG. 6 is a perspective view showing the main part of the overall configuration. FIG. 3 is an enlarged cross-sectional view of a main part. In addition, about the structure which is the same as that of the embodiment mentioned above, or corresponds, the same code | symbol is attached | subjected in drawing, and the description is abbreviate | omitted.
[0038]
As shown in FIG. 6, in the present embodiment, a presser device 30 is disposed in the vicinity of the left end portion of the sewing machine arm 4 indicated by a broken line in FIG. The presser device 30 has a presser bar 31 as a bearing member 13 whose lower end is exposed to the outside of the sewing machine body 2, and the presser bar 31 is located at the lower end inside the vicinity of the left end of the sewing machine arm 4. The presser bar bearing 32 as a bearing member 15 disposed so that the portion protrudes from the sewing machine arm 4 toward the bed 3, that is, exposed to the outside of the sewing machine body 2, and presser adjustment inside the sewing machine arm 4 A presser bar guide 34 fixed by tightening the screw 33 is supported and disposed so as to be reciprocally movable in the vertical direction indicated by a double arrow C in FIGS. A presser 36 is attached to the lower end of the presser bar 31 and is urged to press downward by a presser adjusting spring 37. Then, the movement of the well-known presser lifter and knee lifter (not shown) is transmitted to the presser bar 31 via the presser bar holder 35 so that the presser bar 31 moves up and down.
[0039]
As shown in detail in FIG. 7, the presser bar 31 as the bearing member 13 of the present embodiment is made of a metal such as a steel material or an aluminum alloy, like the needle bar 14 of the first embodiment described above. Has been. In FIG. 7, the coating layer 18 made of ceramics having better 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 19b of the presser bar bearing 32 as the sliding surface 19 of the bearing member 15 to be described later and the sliding surface 20b that slides are formed by the coating layer 18 made of ceramics.
[0040]
Further, the presser 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, and the surface of the base material 39 made of metal such as steel or aluminum alloy. It is configured by forming a resin layer 22 made of resin on the (inner peripheral surface). In other words, the sliding surface 20b of the presser bar 31 that is the sliding surface 20 of the bearing member 13 and the sliding surface 19b of the presser bar bearing 32 that is the sliding surface 19 of the bearing member 15 that slides are made of resin. It is formed by the layer 22.
[0041]
That is, in this embodiment, the sliding surface 20b formed by the cover layer 18 made of ceramics of the presser bar 31 and the sliding surface 19b formed by the resin layer 22 made of resin of the presser bar bearing 32. Thus, the presser bar 31 can be operated at high speed in an oil-free state.
[0042]
At the lower end portion of the presser bar bearing 32 exposed to the outside of the sewing machine main body 2, the wear powder capturing member 23 is disposed in the same manner as the needle bar lower bearing 16a of the first embodiment described above. .
[0043]
The presser bar 31, the presser bar bearing 32, and the wear powder capturing member 23 constitute the industrial sewing machine bearing structure 26B of the present embodiment.
[0044]
Other configurations are the same as those of the industrial sewing machine bearing structure 26 of the first embodiment described above.
[0045]
The industrial sewing machine bearing structure 26B of the present embodiment having such a configuration has the same effects as the industrial sewing machine bearing structures 26 and 26A of the above-described embodiments.
[0046]
FIG. 8 is an enlarged cross-sectional view of an essential part showing a fourth embodiment in which the industrial sewing machine bearing structure according to the present invention is used as a presser bar.
[0047]
As shown in FIG. 8, the industrial sewing machine bearing structure 26 </ b> C of the present embodiment includes a presser foot formed only of the resin layer 22 instead of the presser bar bearing 32 as the bearing member 15 of the third embodiment described above. A rod 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.
[0048]
The industrial sewing machine bearing structure 26C of the present embodiment having such a configuration has the same effects as the industrial sewing machine bearing structures 26, 26A, and 26B of the above-described embodiments.
[0049]
The present invention is not limited to the above-described embodiment. For example, instead of the above-described coating layer made of ceramics, a coating layer made of an electroless nickel boron plating layer, a composite nickel phosphorus plating layer, or the like is necessary. It can be changed according to.
[0050]
【The invention's effect】
As described above, according to the bearing structure for an industrial sewing machine of the present invention, even when the sliding portion is made non-lubricated or a small amount of lubrication, the wear powder is not discharged to the outside. It is possible to reliably prevent such an effect.
[Brief description of the drawings]
FIG. 1 is a perspective view showing the main part of the overall configuration of a first embodiment in which the industrial sewing machine bearing structure according to the present invention is used as a needle bar. FIG. 2 is an enlarged cross-sectional view of the main part of FIG. 3 is an enlarged cross-sectional view of the main part showing a modified example of the attachment structure of the friction capturing member of FIG. 1. FIG. 4 is a view similar to FIG. 3 showing another modified example of the attachment structure of the friction capturing member of FIG. FIG. 5 is an enlarged cross-sectional view showing the main part of a second embodiment in which the industrial sewing machine bearing structure according to the present invention is used as a needle bar. FIG. 6 shows the industrial sewing machine bearing structure according to the present invention as a presser bar. FIG. 7 is an enlarged cross-sectional view of the main part of FIG. 6; FIG. 8 is an industrial sewing machine bearing structure according to the present invention used as a presser bar. Expanded sectional view showing the main part of the fourth embodiment [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Industrial sewing machine 2 Sewing machine main body 9 Needle bar apparatus 13 Bearing member 14 Needle bar 15 (As a bearing member) Bearing member 16 Needle bar bearing 16b (As a bearing member) Needle bar lower bearing 18 Coating layers 19, 19a, 19b Sliding surfaces 20, 20a, 20b Sliding surface 22 Resin layer 23 Wear powder capturing member 26, 26A, 26B, 26C Industrial sewing machine bearing structure 31 Presser bar 32 (as bearing member) Presser (as bearing member) Bar bearing

Claims (3)

A bearing member having at least a sliding surface formed of a resin layer made of resin, and supported by the bearing member so as to be slidable, and at least a part of the outer surface of the sewing machine body is exposed to be slidable with the sliding surface of the bearing member. A bearing member that is reciprocated in a vertical direction in contact with the bearing member, and a sliding surface of the bearing member and a bearing member of the bearing member that are disposed at a lower end portion exposed to the outside of the sewing machine body of the bearing member. A bearing structure for an industrial sewing machine, comprising a wear powder capturing member impregnated with an oil component that adsorbs wear powder generated by sliding with a sliding surface. The wear powder capturing member is attached to the end surface of the lower end portion of the bearing member by a capturing member mounting body having a substantially L-shaped cross section, and the capturing member mounting body is connected to the bearing member by a plurality of set screws. 2. The attachment according to claim 1, wherein the capture member mounting body is attached so as to surround an outer peripheral surface of a lower end portion, and the capture member attachment body is detachable by loosening the plurality of set screws. Bearing structure for industrial sewing machines. The industrial sewing machine bearing structure according to claim 1, wherein the bearing member is a needle bar or a presser bar.

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