JPS6031666Y2 - Oil level confirmation device for oil tank in sewing machine - Google Patents

Description

[Detailed description of the invention] This invention relates to a device for checking the oil level in the oil tank, and in particular, visually checks from the top of the machine frame of the sewing machine to check the necessity of oiling the oil tank in the sewing machine frame and whether or not sufficient oil has been filled. This relates to an oil level confirmation device that allows

A first embodiment of this invention will be described below with reference to FIG. 1.2.3.

Reference numeral 1 designates an upper surface cover that covers the upper surface of the sewing machine frame 2, and forms a vertical hole 3 and an oil filling hole 4.

Reference numeral 5 denotes a fuel tank supported inside the machine frame 2, which has an upper opening facing below the hole 3 and the oil fill hole 4 of the top cover 1, and has a recess 6 formed in a lower portion opposite to the hole 3.

Reference numeral 7 denotes a felt inserted from above into the oil tank 5. This felt 7 is soaked with oil in the oil tank 5, and when the amount of oil decreases, it is absorbed by the capillary action of the oil wick 8 hanging below the recess 6. The oil soaks in the oil and is supplied to each part of the sewing machine to be lubricated through an oil wick (not shown) whose end contacts the felt 7.

9 is a columnar body made of transparent resin such as acrylic;
Its upper end is fitted into the hole 3 of the upper cover 1 and fixed with an adhesive or the like, and its lower end is positioned within the recess 6 of the fuel tank 5.

Further, below this columnar body 9, a circular upper critical surface 11 and a lower critical surface 12 are formed by sandwiching an upper collar 10 at positions separated in the vertical direction and radial direction, and a lower critical surface 11 and a lower critical surface 12 are formed at the lower end. A brim 13 is formed.

Further, the lower surface 11A of the upper brim 10 facing below the upper critical surface 11 is colored with oil-resistant, for example, green paint.
Color A with red paint.

In this embodiment, for example, when the columnar body 9 is viewed from above the top cover 1 when there is no oil in the oil tank 5 in FIG. 2, light from above is reflected by the upper and lower critical surfaces 11 and 12. It is totally reflected and travels straight in a direction perpendicular to the columnar body 9, and the green and red colored portions of the lower surfaces 11A and 12A are not visible.

From this state, oil is injected from the oil filling hole 4 of the top cover 1, and when the oil level reaches the lower critical surface 12, when looking at the columnar body 9, the area around the lower critical surface 12 is covered with oil, so the columnar body 9 Light from above is not reflected by the lower critical surface 12 and is transmitted downward, so that only the annular red color of the colored lower surface 12A is visible.

Further, when oil is injected from the oil filling hole 4, the oil level in the recess 5 rises, and when the upper critical surface 11 is covered with oil, the columnar body 9
The light from above is transmitted downward without being reflected by the upper critical surface 11, and as a result, the annular green color of the colored lower surface 11A and the red color at the tip are visible. Check and stop lubrication.

Therefore, in this embodiment, by visually checking the annular green color on the lower surface 11A from the top surface of the columnar body 9, it is possible to recognize that the oil supply tank 5 has been sufficiently lubricated, and also because the oil amount has decreased and the annular green color has been visually confirmed from the upper surface of the columnar body 9. By checking the red color, the necessity of filling the fuel tank 5 can be recognized.

Figures 4 and 4A show the side and bottom surfaces of the columnar body 9 in the second embodiment. The lower critical surface 22 is formed, and the upper critical surface 21 thereof is formed.
The outer peripheral portion 21A for the lower critical surface 22 is colored green, and the lower critical surface 22
The outer peripheral portion 22A facing the is colored red.

In this embodiment, when there is no oil in the fuel tank 5, the light from the top surface of the columnar body 9 is totally reflected by the upper and lower critical surfaces 21 and 22, and the green ring and the red ring are separated. appear.

When the lower critical surface 22 is covered with oil due to oil injection, the light from the upper surface of the columnar body 9 is transmitted through the lower critical surface 22 without being reflected, and the red ring becomes invisible and only the green ring is visible. .

Furthermore, when the upper critical surface 21 is covered with oil by injection,
The light from the upper surface of the columnar body 9 is transmitted through the upper critical surface 21 without being reflected, and the green ring is no longer visible.

Therefore, in this embodiment, it can be confirmed that the annular green color around the upper critical surface 21 is no longer visible from the top surface of the columnar body 9, and it can be confirmed that the oil supply tank 5 has been sufficiently filled with oil. When the amount decreases and an annular red color is visible, it is possible to recognize the necessity of filling the fuel tank 5.

Figures 5 and 5A show the side and bottom surfaces of the columnar body 9 in the third embodiment. In this embodiment, a collar 20 is placed below the columnar body 9, and a circular upper part Critical surface 3
1 is formed, and a lower critical surface 32 in the shape of a cylinder cut diagonally is formed below.

Further, the lower surface 3 of the collar 20 facing below the upper critical surface 31
1A is colored green, and the outer peripheral portion 32A corresponding to the lower critical surface 32 is colored red.

In this embodiment, when there is no oil in the fuel tank 5, the light from above the columnar body 9 is totally reflected in the orthogonal direction at the upper critical surface 31, and the green colored portion of the lower surface 31A is However, at the lower critical surface 32, an almost annular red ring is visible due to total reflection.

When the oil in the oil tank 5 is injected from this state and the oil level covers the lower critical surface 32, the light from above the columnar body 9 passes through the lower critical surface, the red ring becomes invisible, and the oil level covers the lower critical surface 32. covers the upper critical surface 31, the light from above covers the upper critical surface 31.
The green ring on the lower surface 31A can be seen through it.

Therefore, in this embodiment, the lower surface 3 of the upper critical surface 31
By seeing the green ring 1A, you can confirm that the oil tank 5 has been sufficiently filled with oil, and by seeing the red ring as the oil amount decreases, you can confirm that the oil tank 5 has been filled with enough oil. I can recognize the need.

As yet another embodiment, two or more of the critical surfaces are formed, and the portions corresponding to the critical surfaces are colored in different colors, and the amount of oil in the fuel tank is recognized by the color visible from above the columnar body 9. You can also.

As described above, this invention forms at least two critical surfaces separated in the vertical direction and radial direction on the transparent columnar body 9 in the fuel tank, and colors the lower surface or outer circumferential surface corresponding to these critical surfaces. However, depending on whether these colors are visible or not, it is possible to visually check whether there is oil in the fuel tank located inside the machine frame and whether the appropriate amount is present. It has the effect of ensuring lubrication.

[Brief explanation of the drawing]

Figure 1 is a partial top view of the sewing machine frame, Figure 2 is the
- ■ Cross-sectional view, Figure 3 is a bottom view of the columnar body 9 in Figure 1,
The figure is a side view of the columnar body of the second embodiment, FIG. 4A is a bottom view of the columnar body of FIG. 4, FIG. 5 is a side view of the columnar body of the embodiment of FIG. FIG. 3 is a bottom view of the columnar body shown in the figure. In the figure, 1 is a top cover, 2 is a machine frame, 5 is a fuel tank, 9 is a columnar body, 11, 21.31 is an upper critical surface, 12, 22.
32 is the lower critical surface, IIA, 12A, 21A, 22A,
31A and 32A are colored lower surfaces or outer peripheral parts, respectively.

Claims (1)

[Scope of Claim for Utility Model Registration] Oil supply tank 5 supported inside the sewing machine frame, opened upward, facing the oil supply hole of the machine frame, and supplying lubricating oil to a predetermined oil supply part, and the upper end visually viewed from the top surface of the machine frame. In the oil level confirmation device, the columnar body 9 is made of a transparent body and has its lower end placed in the fuel tank. 1. An oil level confirmation device for an oil supply tank in a sewing machine, characterized in that two critical surfaces are formed, and the lower surface or outer peripheral surface corresponding to the critical surfaces is colored.