JP4054601B2 - sewing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a sewing machine, and more particularly to a sewing machine including a gear box provided with a waste oil outlet for discharging lubricating oil to an oil pan.
[0002]
[Prior art]
A conventional example of a sewing machine having the above gear box will be described with reference to FIGS. The sewing machine includes a bed 202, an oil pan 207 disposed 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 driving shaft 205. The gear device 204 includes a large gear 212 fixed to the lower shaft 203 and a small gear 214 fixed to the shuttle drive shaft 205, and the gear box 206 is provided inside the bed 202. Lubricating oil (not shown) is stored in the oil pan 207.
[0003]
Since the gears 212 and 214 of the gear device 204 mesh at high speed during the sewing machine operation, it is necessary to always supply lubricating oil to prevent seizure. Therefore, the gear device 204 is accommodated in a gear box 206 having a thin plate-like under cover 208 at the bottom, and the lubricating oil 210 can be stored in the gear box 206.
[0004]
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. A waste oil port 220 is provided in the under cover 208. The waste oil port 220 has an upper opening 220a that opens into the gear box 206 and a lower opening 220b that opens to the oil pan 207 side. The upper opening 220a is located at a predetermined height from the bottom of the gear box 206. When the liquid level 216A of the lubricating oil 216 rises from the upper opening 220a when the sewing machine shown in FIG. To the oil pan 207. In this conventional example, a joint is used as the waste oil port 220 and the joint is fixed to the under cover 208.
[0005]
As shown in FIG. 11, the sewing machine can fall in the A direction, and the lubricating oil 216 in the gear box 206 is discharged from the waste oil port 220 to the oil pan 207 during the fall. For this reason, the waste oil port 220 is provided on the lodging direction A side in the space 206 </ b> S in the gear box 206.
[0006]
[Problems to be solved by the invention]
As described above, the upper opening 220a of the waste oil port 220 of the conventional sewing machine is provided on the lodging direction A side in the space 206S in the gear box 206. In the above configuration, the upper opening 220a is located at the end closest to the lodging direction A. It is impossible to arrange. For this reason, a constant gap 220D is formed between the side wall 222 of the gear box 206 on the side of the lying down direction A and the upper opening 220a.
[0007]
Such a gap 220D is formed, and the upper opening 220a is positioned higher than the under cover 208 in order to discharge the lubricating oil 210 for the overflow as described above, and the sewing machine is laid down. Then, as shown in FIG. 11, the upper opening 220 a of the waste oil port 220 cannot be positioned at the lowest position in the space 206 </ b> S in the gear box 206. As a result, the lubricating oil 216 whose level is the horizontal surface 216B passing through the upper opening 220a remains.
[0008]
Along with the operation of the sewing machine, the wear oil generated by the meshing movement of the two gears 212 and 214 is mixed into the lubricating oil 210 in the gear box 206 and settles and accumulates. It is necessary to perform maintenance work for discharging the oil to the oil pan 207 and replacing it with new lubricating oil 210. However, as described above, if the lubricating oil 216 remains even if the sewing machine is laid down, the precipitated wear powder is not discharged and remains in the gear box 206.
[0009]
Accordingly, an object of the present invention is to provide a sewing machine in which lubricating oil is discharged into an oil pan and does not remain in the gear box when the sewing machine is laid down.
[0010]
[Means for Solving the Invention]
In order to achieve the object, according to the invention described in claim 1,
The bed section,
An oil pan arranged in the bed below,
A large gear fixed to the lower shaft and arranged close to the sewing machine lying side,
A small gear that meshes with the large gear, is fixed to the shuttle drive shaft, and is spaced apart on the machine overturning side;
An under cover fixed to a lower portion of the bed portion;
It is composed of a space surrounded by the under cover and the side wall of the bed portion, and includes a gear box that houses the large gear and the small gear ,
The under cover forms a waste oil port capable of discharging the lubricating oil in the gear box to the oil pan, while the waste oil port is an upper opening that opens in the gear box and a lower portion that opens toward the oil pan. In a sewing machine having an opening,
The under cover includes a flat portion corresponding to the small gear, and a concave portion formed below the flat portion so as to correspond to the large gear continuously from the flat portion.
By disposing the waste oil port at a position where the upper opening of the waste oil port is higher than the lowermost part of the under cover recess when the sewing machine stands, and at the lowermost position of the space inside the gear box when the sewing machine falls down,
While the sewing machine stands up, the large gear is immersed in the lubricating oil stored in the recess,
When the sewing machine is overlaid, the lubricating oil does not remain and is discharged to the oil pan through the waste oil port.
According to invention of Claim 2,
The sewing machine according to claim 1, wherein a step is not formed in the under cover recess.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
The sewing machine of the present invention will be described below based on the embodiments shown in the drawings.
[0015]
First, the schematic configuration of the sewing machine of the present invention will be described with reference to FIGS. This sewing machine 1 is a staggered sewing machine in which a needle bar 3 can be moved in a direction orthogonal to the direction of conveyance of a sewing product by a needle swinging mechanism (not shown), and includes a bed portion 2 and an arm portion erected from the bed portion 2. 4, the bed portion 2 is composed of a main body bed portion 6 and a cylinder bed portion 8 that is elongated compared to the main body bed portion 6. An oil pan 10 is disposed below the main body bed portion 6, and a shuttle cover 12 is disposed below the cylinder bed portion 8. The shuttle cover 12 can be opened and closed with respect to the bed portion 2.
[0016]
The rotation of the upper shaft 14 that is rotationally driven by a drive source (not shown) is transmitted to the lower shaft 18 via the timing belt 16. 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 drive shaft 22 are disposed in parallel, but the shuttle drive shaft 22 and the shuttle shaft 26 are disposed in a direction orthogonal to each other. Therefore, the gear device 20 is constituted by a spur gear, and the gear device 24 is constituted by a bevel gear. A hook 28 is attached to the tip of the hook shaft 26.
[0017]
Among the above-described mechanical components, the gear device 24, the hook shaft 26, the hook 28, a moving knife (not shown) and the like are disposed in the cylinder bed portion 8, and the lower shaft 18, the gear device 20, the hook drive shaft 22 and the like are the main body bed. Arranged in the part 6. The cylinder bed portion 8 is cut out at portions other than the space for storing the mechanical parts such as the hook 28 and the gear device 24, so that a cylindrical workpiece can be sewn.
[0018]
As shown in FIG. 9, an oil supply path 32 is formed inside the hook 28, and an oil supply tube (not shown) is connected to the oil supply path 32. Lubricating oil is sent from the oil pan 10 to the oil supply tube via a pump (not shown). The oil supplied to the oil supply path 32 from the oil supply tube lubricates the sliding surfaces of the hook shaft metal 30 and the hook shaft 26 and the sliding portion of the hook 28. A bobbin case 38 containing a bobbin 36 is stored in the hook 28. The gear devices 20 and 24 are housed in gear boxes 40 and 42, respectively, and under covers 44 and 46 are fixed to the lower portion of the bed portion 2 with screws under the gear boxes 40 and 42, respectively.
[0019]
A moving knife (not shown) is disposed in the vicinity of the shuttle 28, and the needle thread is captured and cut by the moving knife. This moving knife is supported by the knife two-piece 48. The main body bed portion 6 is provided with a thread trimming drive unit (not shown), and a link body 50 for driving the moving knife is connected at one end 50a to the thread trimming drive unit and connected at the other end 50b to the knife two or two 48. Has been.
[0020]
Next, with reference to FIG. 9 and FIGS. 1 and 2 which are XX sectional views of FIG. 9, the configuration of the gear box 40 having the waste oil port 114 which is a characteristic part of the present embodiment will be described. The gear box 40 accommodates a large gear 104 fixed to the lower shaft 18 and a small gear 106 fixed to the shuttle drive shaft 22 in a space 102 </ b> S surrounded by the side wall 112 and the under cover 46. The bed portion 2 of this embodiment is thinned, and its thickness H2 is made thinner than the thickness H1 (FIG. 10) of the conventional example.
[0021]
On the other hand, since the large gear 104 has the same size as the conventional one, a recess 108 is formed in a portion corresponding to the large gear 104 of the under cover 46. 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 larger than that of the large gear 104. The concave portion 108 of the present embodiment is provided in a member molded separately from the other portions of the under cover 46, and the member is joined to the other portions of the under cover 46. You may comprise as integral molding. The portion of the under cover 46 other than the recess 108 is a flat thin plate as in the conventional case.
[0022]
The waste oil port 114 is provided as a through hole formed in the under cover 46, and has an upper opening 114a that opens into the gear box 40 and a lower opening 114b that opens to the oil pan 10 side. The upper opening 114a is provided so as to have substantially the same height as the thin plate-like portion other than the recess 108 of the under cover 46 when the sewing machine stands in FIG. Therefore, the upper opening 114 a is at the highest position in the recess 108.
[0023]
As described above, the upper opening 114a of the waste oil port 114 of the present embodiment is positioned at a predetermined height from the lowermost part of the space 102S in the gear box 40 when the sewing machine is erected. When the liquid level 110A of 110 rises from the upper opening 114a, it is discharged from the lower opening 114b to the oil pan 10 by an overflow amount. Accordingly, there is no need to project the upper opening 114a upward from the under cover 46 as in the prior art.
[0024]
As shown in FIG. 2, the sewing machine can fall in the A direction. The waste oil port 114 and therefore the upper opening 114a are provided in the space 102S in the gear box 40 at a location closest to the side wall 112 of the gear box 40 on the sewing machine lying down direction A side.
[0025]
In FIG. 3, the recess 108 is formed inside the side wall 112 of the gear box 40. However, as shown in FIG. 4, a part of the recess 108 can be formed so as to protrude toward the side wall 112. In this case, the upper opening 114a of the waste oil port 114 can be disposed further on the sewing machine lodging direction A side beyond the side wall 112 (the wall surface on the space 102S side).
[0026]
As shown in FIG. 2, when the sewing machine is laid down, 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 the present embodiment does not protrude upward from the under cover 46 as in the conventional example, and the upper opening 114a is disposed closest to the side wall 112 in the space 102S. Thus, when the sewing machine is lying down, the upper opening 114 a of the waste oil port 114 is the lowermost part of the space 102 </ b> S in the gear box 40. Accordingly, 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 precipitated wear powder when the sewing machine is lying down, and does not remain in the gear box 40.
[0027]
FIGS. 5 and 6 are diagrams for explaining inconveniences when a step is formed in the recess 108 as the lubricating oil reservoir of the under cover 46, and an example of the step formed by the recess 116 and the projection 118. The example of the level | step difference formed by is shown. When the sewing machine shown in FIG. 6 is tilted, the lubricating oil 110B remains in the recess 116 in the case of the step formed by the recess 116, and in the case of the step formed by the projection 118, the lubricating oil 110B remains. The lubricating oil 110B remains on top. Therefore, it is necessary to prevent such a step from being formed in the recess 108 of the under cover 46.
[0028]
As mentioned above, although this invention was demonstrated based on embodiment shown on drawing, this invention is not limited to this embodiment, and can be variously changed.
[0029]
【The invention's effect】
According to the present invention, the upper opening of the waste oil outlet is higher than the lowermost part of the space in the gear box when the sewing machine stands and the lowermost part of the space in the gear box when the sewing machine is overturned , that is, the upper opening is located at the gear. Since the waste oil outlet is located in the space in the box closest to the machine fall direction side, all the lubricating oil in the gear box is discharged from the waste oil mouth to the oil pan together with the worn powder that has precipitated when the machine falls down. It does not remain in the box.
[0030]
When the lubricating oil is stored in the recess formed in the under cover of the gear box, the gear box can be thinned and the waste oil port does not need to protrude upward from the under cover.
[0032]
In the case where a step is not formed in the lubricating oil reservoir of the under cover of the gear box, 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 down.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view taken along the line XX of FIG. 9, showing a main part of the sewing machine according to an embodiment of the present invention at the time of standing.
FIG. 2 is a cross-sectional view similar to FIG. 1 when the sewing machine of the present embodiment is lying down.
FIG. 3 is a cross-sectional view of a main part showing an example of arrangement of waste oil ports of the sewing machine according to the present embodiment.
FIG. 4 is a cross-sectional view of a main part showing another arrangement example of the waste oil port of the sewing machine according to 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 reservoir.
FIG. 6 is a cross-sectional view when the sewing machine is lying down when there is a step in the lubricating oil reservoir.
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 according to the present 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 at the time of standing of a conventional sewing machine.
FIG. 11 is a cross-sectional view of a main part when a conventional sewing machine is lying down.
[Explanation of symbols]
2 Bed 10 Oil pan 18 Lower shaft 20 Gear device 22 Hook drive shaft 40 Gear box 46 Under cover 102S Space 108 Recess (lubricating oil reservoir)
110 Lubricating oil 114 Waste oil port 114a Upper opening 114b Lower opening 116, 118 Step

Claims (2)

The bed section,
An oil pan arranged in the bed below,
A large gear fixed to the lower shaft and arranged close to the sewing machine lying side,
A small gear that meshes with the large gear, is fixed to the shuttle drive shaft, and is spaced apart on the machine overturning side;
An under cover fixed to a lower portion of the bed portion;
It is composed of a space surrounded by the under cover and the side wall of the bed portion, and includes a gear box that houses the large gear and the small gear ,
The under cover is formed with a waste oil port through which the lubricating oil in the gear box can be discharged to the oil pan, while the waste oil port has an upper opening that opens into the gear box and a lower portion that opens toward the oil pan. In a sewing machine having an opening,
The under cover includes a flat portion corresponding to the small gear, and a concave portion formed below the flat portion so as to correspond to the large gear continuously from the flat portion.
By disposing the waste oil port at a position where the upper opening of the waste oil port is higher than the lowermost part of the under cover recess when the sewing machine stands, and at the lowermost position of the space inside the gear box when the sewing machine falls down,
While the sewing machine stands up, the large gear is immersed in the lubricating oil stored in the recess,
The sewing machine is characterized in that when the sewing machine is overlaid, the lubricating oil does not remain and is discharged to the oil pan through the waste oil port. The sewing machine according to claim 1, wherein
A sewing machine characterized in that no step is formed in the under cover recess.

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