JPH0711749Y2 - Sewing machine refueling equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an oil supply device for a sewing machine.

[Prior Art] Since the balance crank and the needle bar crank of the sewing machine rotate and move up and down at a high speed as the main shaft 1 rotates,
It is necessary to refuel in order to prevent abrasion and seizure of that part. Further, in order to supply an appropriate amount of lubricating oil without excess or deficiency, the amount of oil supply must be adjusted.

In the prior art, when adjusting the amount of oil supplied to the balance crank or needle bar crank, the oil amount adjusting pin 6 having the eccentric portion 7 wound with rubber 9 as shown in FIG. 3 was used.

According to this, when the oil amount adjusting pin 6 is rotated, the eccentric portion 7 wound with the rubber 9 is simultaneously rotated, and the area of the inlet of the oil discharge pipe 4 is changed. As a result, the oil supply amount changes according to the rotational position of the eccentric portion.

For example, in the case of FIG. 4, the inlet of the oil discharge pipe 4 is completely closed by the side surface of the eccentric pin, and no oil flows into the bearing portion. On the contrary, in the case of FIG. 5A and FIG. 5B, the inflow port of the oil discharge pipe 4 is opened to the maximum, and the amount of oil to the bearing portion is the largest.

In this way, the area of the inlet of the oil discharge pipe 4 is continuously changed by rotating the eccentric portion 7 wound with the rubber 9,
The amount of oil supplied to the needle bar crank and the balance crank was adjusted.

[Problems to be Solved by the Invention] However, the conventional techniques have the following problems.

First, the eccentric portion 7 that minimizes the area of the inlet of the oil discharge pipe 4
The difference in effective adjustment angle between the position of and the position of the maximum eccentric portion 7 is small, and it is difficult to perform fine adjustment. That is, FIG. 5A and FIG.
As shown in FIG. B, the rubber 9 wound around the eccentric portion 7 causes the rubber 9
When the oil amount adjusting pin 6 is rotated by about 36 ° from the state in which the oil is blocked, the amount of oil flowing into the oil discharge pipe 4 becomes maximum, and even if the oil amount adjusting pin 6 is further rotated, the oil amount remains the maximum.

Further, the rubber 9 is wound around the eccentric portion 7 in order to prevent the oil from flowing through the gap between the eccentric portion 7 and the inflow port of the oil discharge pipe 4, but the rubber wound around the eccentric portion 7 with the passage of time. 9 contains oil and expands. Therefore, the cross-sectional area of the eccentric portion 7 becomes large, the area of the inlet of the oil discharge pipe 4 becomes small, and the amount of oil supply changes with the passage of time.

Further, when the oil amount adjusting pin 6 is rotated when adjusting the oil amount, the area of the inlet of the oil discharge pipe 4 also changes due to the stress caused by the rotation.

For this reason, if the desired amount of lubrication is not obtained and the amount of lubrication is too small, the balance crank part and needle bar crank part will wear or seize, and if too large, the oil will drop along the needle bar and the sewing material will be sewn. There was a problem of getting dirty.

[Means for Solving the Problems] In order to solve the above-mentioned problems, in the present invention, an oil amount adjusting pin 2 is dug along the main axis direction on a surface of a plurality of oil amount adjusting grooves 5 having different cross-sectional areas, and a main shaft 1 is provided. Fit in.

[Operation] When the oil amount adjustment pin 2 is rotated when adjusting the oil amount, when a plurality of oil amount adjustment grooves 5 having different cross-sectional areas communicate with the oil discharge hole 4, the oil discharge holes 4 are formed by the respective grooves. The amount of oil that emerges from the outlet changes stepwise.

[Embodiment of the Invention] In FIG. 1, 1 is a main shaft, 2 is an oil amount adjusting pin fitted at the tip of the main shaft 1, 3 is an O-ring, 4 is a balance crank portion or needle bar crank portion The oil discharge pipe 5 through which the oil passes through the oil quantity adjusting groove 5 and the oil quantity adjusting groove 5 are carved on the surface of the oil quantity adjusting pin 2 in the direction of the main shaft 1 so that the oil flowing from the main shaft 1 is sent to the oil discharge pipe 4. It is an adjustment groove. FIG. 2 is a sectional view of the main shaft 1 and the oil amount adjusting pin 2 of FIG. 1 taken along the line AA.

The oil that has passed through the main shaft 1 is supplied from the oil discharge pipe 4 to the balance crank portion and the needle bar crank portion through the oil amount adjusting groove 5.

At this time, when the oil amount adjusting pin 2 is rotated, the oil amount adjusting groove 5 having a different cross-sectional area communicates with the inflow port of the oil discharge pipe 4 to gradually change the amount of oil supplied to the balance crank portion and the needle bar crank portion. Can be adjusted to. When too much oil is supplied to the balance crank portion or needle bar crank portion, the oil amount adjusting pin 2 may be rotated so that the oil amount adjusting groove 5 having a smaller cross-sectional area and the oil discharge pipe 4 communicate with each other. On the contrary, when the amount of oil supplied to the balance crank portion or the needle bar crank portion is too small, the oil amount adjusting pin 2 may be turned so that the oil amount adjusting groove 5 having a larger cross section and the oil discharge pipe 4 communicate with each other. good.

[Effects] As described above, according to the present invention, the oil amount can be adjusted by rotating the oil amount adjusting pin 2 at that position and aligning the predetermined oil amount adjusting groove 5 with the oil discharge pipe 4. When the oil amount adjusting pin 2 is rotated when adjusting the oil amount, the oil amount adjusting pin 2 does not move in the axial direction, so the spindle 1 with a small space
Even if it is provided at the tip of the, etc., when the oil amount is adjusted, the oil amount adjusting pin 2 does not project to the movement path of other mechanism to hinder the movement, and the effect that it can be provided compactly in a narrow place is provided. is there.

Further, in this invention, since the oil amount adjusting groove 5 is formed by the oil discharge pipe 4 of the oil amount adjusting pin 2 and the oil pipe of the main shaft 1 linearly along the axis of the main shaft, the path thereof is short, and dust etc. Is less likely to be clogged in the oil amount adjusting groove 5, and there is an effect that stable oil supply can be achieved.

Further, according to this invention, a plurality of oil amount adjusting grooves 5 are linearly formed along the axis of the main shaft 1 so that the cross-sectional areas (depths) thereof are different from each other. Therefore, the processing is simple and the cost is low. There is an effect.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of an embodiment of the invention, FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a vertical cross-sectional view of a conventional example, and FIG. BB of FIG. 3 for explaining the action
A sectional view of a portion, FIG. 4A is a sectional view of a portion BB in the state where the flow rate of lubricating oil is minimum, and FIGS. 4B and C are B in the state where the flow rate of lubricating oil is maximum.
-B is a sectional view of a portion, and FIG. 5 is a perspective view of a conventional oil amount adjusting pin. 1 ... Spindle, 2 ... Oil amount adjusting pin of the present invention, 3 ... O-ring, 4 ... Oil discharge hole, 5 ... Oil amount adjusting groove, 6 ... Conventional oil amount adjusting pin, 7 ... Eccentric part of conventional oil amount adjustment pin,
8: Conventional groove for oil amount adjustment pin, 9: Rubber.

Claims (1)

[Scope of utility model registration request] 1. A sewing machine in which lubricating oil in an oil storage tank is supplied to each motion mechanism section connected to a main shaft through an oil pipe in the main shaft 1, and an oil pipe in the main shaft 1 along the axial direction of the main shaft 1 and A main shaft 1 having an oil discharge pipe 4 communicating with and intersecting with it, and a cylindrical diameter portion of a tip end is rotatably fitted to the oil pipe of the main shaft 1, and at the outer circumference of the diameter portion, an axis line of the main shaft 1 is attached. Along with the oil amount adjusting pin 2 which connects the oil pipe and the oil discharge pipe, and which is provided with a plurality of different oil amount adjusting grooves 5 each having a different cross-sectional area, the oil amount adjusting pin 2 is rotated. An oil supply device for a sewing machine, wherein the oil amount adjusting groove 5 is selected and matched with the oil discharge pipe to adjust the oil amount.