JP2003326067A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine which gets lubricants ejected into an oil pan to leave none thereof in a gear box when the sewing machine is levelled. <P>SOLUTION: In the sewing machine which is provided with a bed part 2, the oil pan 10 arranged below the bed part and a gear box 40 which is arranged within the bed part while housing a gear device 20 for transmitting driving forces of the lower shaft 18 to a hook drive shaft 22 and in which the gear box has an under cover 46 with a waste oil port 114 that is so formed as to let the lubricant 110 be ejected within the gear box to the oil pan 10, the waste oil port has an upper opening 114a bored into the gear box 40 and a lower opening 114b bored toward the side of the oil pan 10, the upper opening 114a of the waste oil port 114 is so positioned as to be higher than the lowest part of a space 102S within the gear box 40 when the sewing machine is standing while being down to the lowest of the space within the gear box when it is leveled. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine, and more particularly to a sewing machine having a gear box provided with a waste oil port for discharging lubricating oil to an oil pan.

[0002]

2. Description of the Related Art A conventional example of a sewing machine having the above gearbox will be described with reference to FIGS. This sewing machine includes a bed 202, an oil pan 207 arranged below the bed 202, and a gear box 206 that houses a gear device 204 that transmits the driving force of the lower shaft 203 to the shuttle drive shaft 205. The gear device 204 is the lower shaft 2
03 and a small gear 214 fixed to the shuttle drive shaft 205.
Is provided inside the bed 202. Oil pan 20
Lubricating oil (not shown) is stored in 7.

Since the gears 212 and 214 of the gear device 204 mesh at high speed during sewing machine operation, it is necessary to constantly supply lubricating oil to prevent seizure. Therefore, the gear device 204 is housed inside a gear box 206 having a thin plate-like under cover 208 at the bottom.
The lubricating oil 210 can be stored therein.

The amount of the lubricating oil 216 in the gear box 206 is such that at least the lower part of the large gear 212 is immersed in the lubricating oil 216. The undercover 208 has a waste oil port 22.
0 is provided. The waste oil port 220 has an upper opening 220a that opens inside the gear box 206 and a lower opening 220b that opens toward the oil pan 207. The upper opening 220a is located at a predetermined height above the bottom of the gear box 206. When the liquid surface 216A of the lubricating oil 216 rises above the upper opening 220a when the sewing machine is raised as shown in FIG. Is discharged to the oil pan 207. In this conventional example, a joint is used as the waste oil port 220, and the joint is used as the under cover 2
It is fixed at 08.

As shown in FIG. 11, this sewing machine is capable of laying down in the direction A, and the gearbox 206 is laid down when lying down.
The lubricating oil 216 in the oil pan 207 flows from the waste oil port 220.
It is designed to be discharged to. Therefore, the waste oil port 22
0 is provided in the space 206S in the gear box 206 on the falling direction A side.

[0006]

As described above, the upper opening 220a of the waste oil port 220 of the conventional sewing machine has the gearbox 2.
Although it is provided on the side of the lodging direction A in the space 206S in 06, it is impossible to dispose at the end closest to the lodging direction A in the above configuration. Therefore, a constant gap 220D is formed between the side wall 222 of the gear box 206 and the upper opening 220a on the falling direction A side.

The gap 220D is formed, and the upper opening 220a is provided with the under cover 208 to discharge the overflowing lubricating oil 210 as described above.
As shown in FIG. 11, when the sewing machine is laid down for two reasons, the upper opening 220a of the waste oil port 220 is located in the space 20 in the gear box 206.
It cannot be located at the bottom of 6S. As a result,
The lubricating oil 216 having the horizontal surface 216B passing through the upper opening 220a as the liquid surface remains.

As the sewing machine operates, the gear box 206
Wear powder generated by the meshing movement of the two gears 212, 214 is mixed into the lubricating oil 210 in the inside, and is settled and accumulated. Therefore, the lubricating oil 210 is discharged from the waste oil port 220 to the oil pan 207, It is necessary to perform maintenance work to replace the lubricating oil 210 with new one. However, as described above, if the lubricating oil 216 remains even when the sewing machine is laid down, the precipitated abrasion powder is not discharged and remains in the gear box 206.

Therefore, an object of the present invention is to provide a sewing machine in which the lubricating oil is discharged to the oil pan and does not remain in the gear box when the sewing machine is laid down.

[0010]

In order to achieve the above object, according to the invention as set forth in claim 1, a bed portion 2, an oil pan 10 arranged below the bed portion 2 and an inside of the bed portion 2 are arranged. And the driving force of the lower shaft 18 is applied to the hook driving shaft 22.
And a gear box 40 for accommodating the gear device 20 that transmits the gear device 20 to the oil pan 10. The gear box 40 includes an under cover 46 having a waste oil port 114 capable of discharging the lubricating oil 110 in the gear box 40 to the oil pan 10. In the sewing machine, the waste oil port 114 has an upper opening 114a opening into the gear box 40 and a lower opening 114b opening toward the oil pan 10 side. In the sewing machine, the upper opening 114a of the waste oil port 114 is erected by the sewing machine. Sometimes higher than the lowest part of the space 102S in the gear box 40,
In addition, when the sewing machine falls down, the space 1 in the gear box 40
There is provided a sewing machine characterized in that the waste oil port 114 is arranged at the lowermost position of 02S.

The feature of the invention described in claim 2 is that of claim 1.
In the sewing machine described above, a recess 108 is formed in the undercover 46 of the gear box 40, and the recess 108 is formed.
The point is that the lubricating oil 110 is stored therein.

The features of the invention described in claim 3 are as follows.
Or in the sewing machine described in 2, the upper opening 114a
Is provided at a position closest to the sewing machine falling direction A side in the space 102S in the gear box 40.

The feature of the invention described in claim 4 is that of claim 1.
3 to 3, the step 11 is formed in the lubricating oil storage portion 108 of the under cover 46 of the gear box 40.
6, 118 is not formed.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The sewing machine of the present invention will be described below based on the embodiments shown in the drawings.

First, the schematic construction of the sewing machine of the present invention will be described with reference to FIGS. The sewing machine 1 is a zigzag sewing machine in which a needle bar 3 can be moved in a direction orthogonal to a conveying direction of a workpiece by a needle swinging mechanism (not shown).
And an arm part 4 standing upright from the bed part 2. The bed part 2 is composed of a main body bed part 6 and a cylinder bed part 8 which is elongated as compared with the main body bed part 6. An oil pan 10 is arranged below the main body bed portion 6, and a shuttle cover 12 is arranged below the cylinder bed portion 8. The shuttle cover 12 can be opened and closed with respect to the bed 2.

The rotation of the upper shaft 14 driven by a drive source (not shown) is rotated by a timing belt 16 to the lower shaft 1.
8 is transmitted. The rotation of the lower shaft 18 is transmitted to the shuttle drive shaft 22 via the gear device 20. The rotation of the shuttle drive shaft 22 is transmitted to the shuttle shaft 26 via the gear device 24. The lower shaft 18 and the shuttle driving shaft 22 are arranged in parallel, but the shuttle driving shaft 22 and the shuttle shaft 26 are arranged in a direction orthogonal to each other. Therefore, the gear device 20 is a spur gear, and the gear device 24 is a bevel gear. A shuttle 28 is attached to the tip of the shuttle shaft 26.

Among the above mechanical parts, the gear device 24,
A shuttle shaft 26, a shuttle 28, a moving knife (not shown) and the like are arranged in the cylinder bed portion 8, and a lower shaft 18, a gear device 20, a shuttle drive shaft 22 and the like are arranged in the main body bed portion 6. The cylinder bed portion 8 is notched except the space for accommodating the mechanical parts such as the shuttle 28 and the gear device 24 so that a tubular workpiece can be sewn.

As shown in FIG. 9, an oil supply passage 32 is formed inside the shuttle 28, and an oil supply tube (not shown) is connected to the oil supply passage 32. Lubricating oil is sent from the oil pan 10 to the oil supply tube through a pump (not shown). The oil supplied from the oil supply tube to the oil supply path 32 lubricates the sliding surfaces of the shuttle shaft metal 30 and the shuttle shaft 26 and the sliding portion of the shuttle 28. A bobbin case 38 accommodating a bobbin 36 is accommodated in the shuttle 28. Gear device 2
0 and 24 are housed in gear boxes 40 and 42, respectively, and under covers 44 and 46 are screwed and fixed to the lower portion of the bed portion 2 at the lower portions of the gear boxes 40 and 42, respectively.

A moving knife (not shown) is arranged in the vicinity of the shuttle 28, and the needle thread is caught and cut by the moving knife. This moving knife is supported by the knife bifurcation 48. A thread cutting drive unit (not shown) is arranged in the main body bed section 6, and a link body 50 for driving the moving knife is connected to the thread cutting drive unit at one end 50a and connected to the knife fork 48 at the other end 50b. Has been done.

Next, referring to FIG. 9 and FIGS. 1 and 2 which are sectional views taken along the line XX of FIG. 9, the structure of the gear box 40 having the waste oil port 114, which is a characteristic part of this embodiment, will be described. . The gear box 40 includes a lower shaft 1 in a space 102S surrounded by the side wall 112 and the under cover 46.
The large gear 104 fixed to the No. 8 and the small gear 106 fixed to the shuttle drive shaft 22 are accommodated. The bed portion 2 of the present embodiment is made thinner, and the thickness H2 thereof is thinner than the thickness H1 (FIG. 10) of the conventional example.

On the other hand, since the large gear 104 has the same size as the conventional one, the recess 108 is formed in the portion of the under cover 46 corresponding to the large gear 104. The lubricating oil 110 is stored in the recess 108. As is clear from FIG. 9, the width of the recess 108 in the direction of the lower shaft 18 is slightly wider than that of the large gear 104. Although the recess 108 of the present embodiment is provided in a member formed separately from the other portion of the under cover 46 and the member is joined to the other portion of the under cover 46,
It may be integrally formed with the under cover 46.
The portion of the under cover 46 other than the recess 108 is a flat thin plate like the conventional one.

The waste oil port 114 is provided as a through hole formed in the under cover 46, and has an upper opening 114a opening to the inside of the gear box 40 and a lower opening 114b opening to the oil pan 10 side. Upper opening 114a
Is the undercover 46 when the sewing machine of FIG.
It is provided so as to have substantially the same height as the thin plate-shaped portion other than the recess 108. Therefore, this upper opening 114a
Is at the highest position in the recess 108.

As described above, the upper opening 114a of the waste oil port 114 of this embodiment has the gear box 40 when the sewing machine stands up.
Since it is located at a predetermined height from the lowermost part of the inner space 102S, when the liquid surface 110A of the lubricating oil 110 rises above the upper opening 114a when the sewing machine is raised as shown in FIG. Bread 10
Is discharged to. Therefore, as in the conventional case, the upper opening 114a is
It is no longer necessary to project the above from the under cover 46.

This sewing machine can be laid down in the direction A as shown in FIG. Waste oil port 114 and therefore upper opening 11
4a is provided in the space 102S in the gear box 40 at a position closest to the side wall 112 of the gear box 40 on the sewing machine falling direction A side.

In FIG. 3, the recess 108 is formed inside the side wall 112 of the gear box 40, but as shown in FIG. 4, a part of the recess 108 can be formed so as to project to the side wall 112 side. . In this case, the upper opening 114a of the waste oil port 114 can be disposed further on the sewing machine inclining direction A side beyond the side wall 112 (the wall surface on the space 102S side thereof).

When the sewing machine is laid down as shown in FIG. 2, the lubricating oil 110 in the gear box 40 is discharged from the waste oil port 114 to the oil pan 10. The upper opening 114a of the waste oil port 114 of this embodiment has the undercover 4 as in the conventional example.
6 does not project upward and the upper opening 114a
Is located closest to the side wall 112 in the space 102S, the upper opening 114a of the waste oil port 114 when the sewing machine is overturned is the space 102 in the gear box 40.
It is at the bottom of S. Therefore, when the sewing machine falls down, the lubricating oil 110 in the gear box 40 is discharged from the waste oil port 114 to the oil pan 10 together with the deposited abrasion powder, and does not remain in the gear box 40.

FIGS. 5 and 6 are views for explaining the inconvenience when a step is formed in the recess 108 as the lubricating oil storage portion of the under cover 46, and an example of the step formed by the recess 116, An example of a step formed by the convex portion 118 is shown. When the sewing machine shown in FIG. 6 falls down, the lubricating oil 110B remains in the concave portion 116 in the case of the step formed by the concave portion 116 and the convex oil 118 of the convex portion 118 in the case of the step formed by the convex portion 118. The lubricating oil 110B remains on the top. Therefore, the undercover 46
It is necessary to prevent such a step from being formed in the recess 108.

Although the present invention has been described based on the embodiment shown in the drawings, the present invention is not limited to this embodiment and can be variously modified.

[0029]

According to the present invention, the upper opening of the waste oil port is
Since the waste oil port is located at a position that is higher than the bottom of the space inside the gear box when the sewing machine is erected and at the bottom of the space inside the gear box when the sewing machine falls, the lubricating oil inside the gear box will settle when the sewing machine falls. All of the abrasion powder is discharged from the waste oil port to the oil pan, and does not remain in the gear box.

When the lubricating oil is stored in the recess formed in the under cover of the gear box, the gear box can be made thin and the waste oil port must be projected upward from the under cover. Lost.

When the upper opening is provided at a position closest to the sewing machine falling direction side in the space inside the gear box, the lubricating oil in the gear box is surely transferred from the waste oil port to the oil pan when the sewing machine falls down. Is discharged.

In the case where the lubricating oil storage portion of the under cover of the gear box has no step, the lubricating oil in the gear box is more effectively discharged from the waste oil port to the oil pan when the sewing machine falls. .

[Brief description of drawings]

FIG. 1 is a cross-sectional view taken along line XX of FIG. 9, showing a main part of a sewing machine according to an embodiment of the present invention when it is erected.

FIG. 2 is a cross-sectional view similar to FIG. 1 when the sewing machine according to the present embodiment falls down.

FIG. 3 is a cross-sectional view of essential parts showing an arrangement example of a waste oil port of the sewing machine of the present embodiment.

FIG. 4 is a cross-sectional view of essential parts showing another example of arrangement of waste oil ports of the sewing machine of the present embodiment.

FIG. 5 is a cross-sectional view when the sewing machine stands up when there is a step in the lubricating oil storage portion.

FIG. 6 is a cross-sectional view when the sewing machine falls down when there is a step in the lubricating oil storage portion.

FIG. 7 is an external perspective view of the sewing machine according to the present embodiment.

FIG. 8 is a perspective view showing a basic mechanism of the sewing machine of this embodiment.

FIG. 9 is a bottom view of a main part of the sewing machine according to the present embodiment.

FIG. 10 is a cross-sectional view of a main part of a conventional sewing machine when it is erected.

FIG. 11 is a cross-sectional view of a main part of the conventional sewing machine when the sewing machine falls down.

[Explanation of symbols]

2 beds 10 oil pan 18 Lower shaft 20 gear system 22 hook drive shaft 40 gearbox 46 Undercover 102S space 108 recess (lubricating oil reservoir) 110 Lubricating oil 114 Waste oil port 114a Upper opening 114b Lower opening 116, 118 steps

Claims (4)

[Claims] 1. A bed part, an oil pan arranged below the bed part, and a gear box arranged inside the bed part and accommodating a gear device for transmitting the driving force of the lower shaft to the shuttle drive shaft. , The gear box has an under cover formed with a waste oil port capable of discharging the lubricating oil in the gear box to the oil pan, and the waste oil port is located in an upper opening in the gear box and on the oil pan side. In a sewing machine having a lower opening that opens toward, the upper opening of the waste oil port is higher than the lowermost part of the space inside the gear box when the sewing machine stands up, and the lowermost part of the space inside the gear box when the sewing machine falls down. A sewing machine characterized in that the waste oil port is arranged at a certain position. 2. The sewing machine according to claim 1, wherein a recess is formed in the undercover of the gear box, and lubricating oil is stored in the recess. 3. The sewing machine according to claim 1 or 2, wherein the upper opening is provided at a position closest to a sewing machine falling direction side in a space inside the gear box. 4. The sewing machine according to claim 1, wherein a step is not formed in the lubricating oil storage portion of the under cover of the gear box.