CN1115812A - Lubricating device for sewing machine - Google Patents

Abstract

The present invention provides a sewing machine lubricating device capable of constantly supplying an appropriate amount of lubricating oil to sliding parts of the sewing machine. It consists of a pump P that outputs lubricating oil from the oil storage mechanism of the sewing machine, an oil quantity regulating mechanism 3 that regulates the supply amount of lubricating oil supplied to each sliding part of the sewing machine, and an oil quantity regulating mechanism 3 provided between the pump P and the oil quantity regulating mechanism 3. Road X, and the excess part of lubricating oil supplied by the pump P is returned to the oil storage device C used for the storage and sliding mechanism of the sewing machine.

Description

Lubricating device for sewing machine

The present invention relates to a sewing machine lubricating device, more particularly, relates to a sewing machine lubricating device capable of constantly supplying an appropriate amount of lubricating oil to the sliding portion of the sewing machine.

Fig. 4 is a perspective view showing the structure of the oil supply device of the previous sewing machine. Among the figures, P is a pump, and this pump is connected with the lower shaft 1 of the sewing machine M, and can act when the lower shaft 1 rotates, that is, when the sewing machine is driven. Suction the lubricating oil in the oil storage mechanism (oil pan) not shown in the figure, and output the lubricating oil from the outlet Pa.

2 is an oil distribution mechanism connected to the pump P through pipelines. This oil distribution mechanism 2 can distribute the lubricating oil output by the pump P into two pipelines, and has two outflow parts 2a and 2b as shown in the figure.

Also, the lubricating oil distributed by this oil distribution mechanism 2 is delivered to the upper and lower sides of the sewing machine M through the oil delivery pipes x and y, respectively.

Next, the action of the lubricating oil delivered to the upper part of the sewing machine from the oil delivery pipe y will be described.

Lubricating oil from the pump P through the oil delivery pipe y is sent to the cylinder member 7 provided with the outflow hole 7a, flows out from the outflow hole 7a of the cylinder member 7, and is accumulated in the oil storage plate 8 provided above the sewing machine M. This oil storage plate 8 has a return pipe 8a at the through hole formed near its upper end. Usually, the lubricating oil supplied excessively from the pump P flows to the oil storage mechanism through the return pipe 8a, thereby ensuring a certain amount of lubricating oil. .

And the oil storage dish 8 is connected with the known oil scattering member 6 that is arranged on the thread take-up 5 of the sewing machine through the pipe 9, and the lubricating oil of the oil storage dish 8 is made toward the pick that is arranged on the sewing machine head through this oil scattering member 6. The sliding parts such as the thread guide 5 and the needle bar 10 are scattered, so that lubricating oil is supplied to each sliding part.

11 is an oil return pipe, and this oil return pipe can make the lubricating oil absorbed by the felt 11a and remaining in the sewing machine head when the oil is supplied to each sliding part by the oil scattering member 6 return to the oil storage mechanism of the sewing machine.

On the other hand, the lubricating oil passed through the above-mentioned oil delivery pipe x by the pump P is sent to the oil quantity regulating mechanism 3 which regulates the passing quantity of the lubricating oil, and is sent to the rotary hook 4 which is a sliding part of the sewing machine through the oil quantity regulating mechanism 3 .

As shown in FIG. 5, this oil amount adjusting mechanism 3 is constituted by an oil soaking member 3a connected to the rotary hook 4 and an adjusting mechanism 3b for changing the oil passing amount of the oil soaking member 3a. The oil-permeable member is composed of a contact felt 3c and an oil wick 3d that are in contact with the lower surface of the rotary shaft 4a of the rotary hook 4. As shown in FIG. The oil wick 3d is arranged between the oil delivery pipe x housed in the rubber tube and the contact felt 3c. The adjusting mechanism 3b is composed of an adjusting screw 3e capable of advancing and retreating along the direction of the oil wick 3d, and a ball member 3f arranged between the adjusting screw 3e and the oil wick 3d.

This oil adjusting mechanism 3 changes the tightening force of the oil wick 3d via the ball member 3f by rotating the adjusting screw 3e in the forward and reverse directions, thereby changing the oil passage resistance of the oil wick 3d, thereby adjusting the amount of oil supplied to the rotary hook 4. oil volume.

However, the above-mentioned conventional sewing machine lubricating device has the following problems.

That is, since the pump P constantly and forcibly sends a specified amount of lubricating oil to the oil quantity regulating mechanism 3, there is a problem that the oil quantity regulating mechanism 3 cannot be used to finely adjust the supply quantity. For example, even if the oil quantity regulating mechanism 3 is adjusted like reducing the quantity of oil supplied to the rotary shuttle 4, since the pump P still pumps the same amount of oil as before the oil quantity regulating mechanism 3 was adjusted, the oil quantity regulating mechanism 3 cannot properly restrain the amount of oil being sent. The flow of incoming lubricating oil, therefore, will also supply excess lubricating oil to the rotary shuttle.

The sewing machine must adjust the sewing speed according to the sewing object. However, when the sewing speed of the sewing machine is adjusted, the rotation speed of the lower shaft 1 changes, so that the oil delivery volume of the pump P also changes accordingly. The oil quantity of the rotary shuttle 4 is adjusted to a suitable quantity. For example, when the rotational speed of the lower shaft is changed from a low-speed operation of 160 rpm to a high-speed operation of 3,000 rpm, the amount of oil delivered by the pump increases, and as a result, lubricating oil exceeding the required amount of oil passes through the oil volume. The adjustment mechanism 3 is conveyed to the rotary shuttle 4 .

When the excess lubricating oil is supplied to the rotary hook 4 as mentioned above, the sewing thread (bottom thread) contained in the rotary hook 4 will be soiled by the lubricating oil, and there is a problem that the quality of sewing is lowered.

On the other hand, the conventional lubricating device for sewing machines has the following problem different from the above-mentioned problem of supplying excess lubricating oil to the drive unit. When the oil storage mechanism of the sewing machine is separated from the pump P for maintenance of the sewing machine, air will enter the pump P, and the pump P will deliver the entered air to the rotary shuttle when it is driven.

In addition, cavitation is also caused when the pump P rotates at high speed, thereby causing air bubbles in the lubricating oil. In this case, the pump P also sends air bubbles (air) to the rotary shuttle, so that the supply of the rotary shuttle If the amount of oil is insufficient, when the rotary hook is significantly worn, there is a problem of corroding the worn part.

Also because when the sewing machine is stopped for a long time, the lubricating oil that is delivered to the rotary shuttle gradually withdraws (countercurrent), and when the sewing machine is driven again, there is a problem that the rotary shuttle is in a state of insufficient lubricating oil for a while, which becomes the problem of making the sewing machine durable. cause of decreased sex.

The lubricating device of the sewing machine of the present invention made in order to solve the above-mentioned previous problems has a pump for outputting lubricating oil from the oil storage mechanism of the sewing machine; The amount regulating mechanism; the oil passage provided between the pump and the oil amount adjusting mechanism; the oil storage device used to return the excess part of the lubricating oil supplied from the pump to the oil storage mechanism of the above-mentioned sewing machine. The lubricating oil discharge hole on the above-mentioned oil storage device is arranged at a position higher than the above-mentioned oil quantity adjustment mechanism; The distributing pipe connected to the upper part of the oil storage dish and the above-mentioned oil passage and the return pipe for returning the lubricating oil sent to the oil storage dish in excess to the oil storage mechanism of the sewing machine constitute.

Since the oil storage device for the oil supply device of the sewing machine of the present invention returns excess lubricating oil supplied by the pump to the oil storage mechanism of the sewing machine, only an appropriate amount of lubricating oil adjusted by the oil quantity adjustment mechanism can be supplied to the driving part.

In the case of pumping out air, the air can be made to rise in the distribution pipe connecting the pump and the oil quantity adjustment mechanism on the upper part of the oil passage and released to the outside, so that the air can be prevented from being supplied to the oil quantity adjustment mechanism, and an appropriate amount can always be delivered. Oil is supplied to the drive section.

Also because the oil storage device can gradually deliver the excess lubricating oil delivered by the pump to the driving part after the sewing machine stops, thereby the problem of insufficient lubricating oil in the driving part when the sewing machine is driven again can be solved.

Fig. 1 is a perspective view showing an embodiment of the sewing machine oil supply device of the present invention,

Fig. 2 is a schematic diagram showing the function of the pump sending air to the oil delivery pipe in the sewing machine oil supply device shown in Fig. 1,

Fig. 3 is a perspective view showing the structure of a distribution pipeline in a sewing machine having two rotary hooks as driving parts,

Fig. 4 is a perspective view showing the structure of a conventional sewing machine oil supply device,

Fig. 5 is a sectional view showing the structure of an oil amount adjusting mechanism provided in the oil supply device of the sewing machine.

Embodiments of the present invention will be described below with reference to the drawings. The parts that are the same as those in the previous examples are assigned the same symbols, and repeated descriptions thereof will be omitted. 1 to 3 are diagrams showing an embodiment of a sewing machine lubricating device according to the present invention.

In Fig. 1, C is the oil storage device used to return the surplus part of the lubricating oil supplied by the pump to the sewing machine oil storage mechanism. 8. The oil delivery pipe x as the oil passage connected to the adjustment mechanism 3, the distribution pipe A arranged between the oil inlet and outlet part 8a formed at the lower end of the oil storage dish 8 and the oil delivery pipe x, and the oil delivery pipe A arranged on the oil storage dish 8 Oil return pipe 8a constitutes.

The distribution pipe A connected to the oil delivery pipe x is connected to the upper part of the oil delivery pipe x as shown in Fig. 1(b), and the distribution pipe A is vertically arranged upward. And as the upper port of the lubricating oil discharge hole of this dispensing pipe A extends to the oil storage dish 8 as shown in the figure, promptly is arranged on the position higher than the oil quantity regulating mechanism 3.

Next, the operation of the sewing machine oil supply device provided with this oil storage device C will be described. When the adjusting screw 3e of the oil amount adjusting mechanism 3 is adjusted so that the amount of oil supplied becomes necessary for the rotary shuttle 4 (drive part) and the sewing machine is driven, as shown in Fig. 1(b), the lubricating oil output from the pump P The amount 22 is more than the oil supply 21 adjusted by the oil amount regulating mechanism 3, then the excess lubricating oil 23 flows into the distribution pipe A connected with the oil delivery pipe x and rises, and is accumulated in the oil storage plate 8.

That is, even if the pump P forcibly outputs excess lubricating oil, the pressure output by the pump P can not be directly added to the oil volume adjustment mechanism 3, and the oil volume adjustment mechanism 3 only releases the part of the oil that is adjusted to an appropriate amount. A rotary hook 4 is supplied as a sliding part.

In addition, even if the sewing speed of the sewing machine (that is, the rotation speed of the lower shaft) is adjusted to change the amount of lubricating oil 22 output by the pump P, the amount of lubricating oil entering the distribution pipe A can be changed according to the change of the amount of lubricating oil 22 . Oil quantity 23, even if do not change the oil quantity 21 that oil quantity regulating mechanism 3 supplies rotary shuttle 4, also can supply rotary shuttle 4 with the suitable lubricating oil quantity that has adjusted by oil quantity regulating mechanism 3.

The lubricating oil discharge hole (the upper end hole of the distribution pipe A) of the oil storage device C is arranged at a position higher than the oil volume adjustment mechanism 3, so that the excess lubricating oil that the oil volume adjustment mechanism 3 does not need is discharged from the oil delivery pipe. x flows out, while the lubricating oil required by the oil quantity regulating mechanism 3 does not flow out from the oil delivery pipe x. Moreover, the lubricating oil accumulated in the oil storage dish 8 is naturally supplied to various driving parts such as the thread take-up device 5 and the needle bar 10 of the sewing machine as described above, and is sent to the rotary shuttle 4 through the oil delivery pipe x after the sewing machine stops. Therefore, the problem of insufficient lubricating oil for the rotary hook 4 when the sewing machine is re-driven can be solved.

On the other hand, when air is sucked into the pump P, or when air bubbles are generated in the oil due to cavitation in the pump P, the oil storage device C can release the air from the oil delivery pipe x, thereby preventing the air supply. Go to rotary shuttle 4.

That is, as shown in Figure 2, although the air K in the oil delivery pipe x moves toward the direction of the oil volume adjustment mechanism 3 (direction of the arrow) due to the action of the pump P, when the air K reaches the distribution pipe A, it is lighter than the oil The air K enters the distributing pipe A arranged upwards, rises along the distributing pipe A, passes through the oil storage plate 8, and is discharged to the outside.

In this way, the air K will not be sent to the oil regulating mechanism 3 and the rotary shuttle 4 positioned at the front of the distribution pipe A, but an appropriate amount of lubricating oil can always be supplied to the rotary shuttle 4.

This embodiment is provided with a sewing machine with a rotary shuttle 4 as an example. In a sewing machine (two-needle sewing machine) with 2 rotary shuttles, as shown in FIG. By installing the tubes A separately, the same effect as above can be obtained.

In this embodiment, it has been shown that the oil storage device C is an example in which the distribution pipe A is connected to the oil storage plate 8 through a pipeline, but the distribution pipe A is made thicker or longer, and it can fully Under the condition that there is the necessary lubricating oil when the sewing machine is driven again in the distribution pipe A, no pipe connection may be established between the distribution pipe A and the oil storage dish 8 .

In addition, it can be easily conceived that the most suitable conditions can be obtained by changing the flow rate of the distribution pipe A by providing a flow regulating valve between the distribution pipe A and the oil storage plate 8 .

In the sewing machine lubricating device of this embodiment, the structure of the portion that supplies oil to the upper part of the sewing machine such as the thread take-up 5 and the needle bar 10 of the sewing machine is as follows.

_B1 shown in FIG. 1 is a needle bar oil supply pipe provided between the needle bar 10 and the oil scattering mechanism 6, and this needle bar oil supply pipe _B1 can pass a part of oil output from the oil scattering mechanism 6 to supply the needle bar. And _B2 is the needle bar oil return pipe arranged between the needle bar 10 and the oil return pipe 11, this needle bar oil return pipe _B2 is provided with the oil that is in contact with the needle bar 10 and absorbs the oil supplied to the needle bar 10 Felt, the oil that is excessively supplied to the needle bar 10 is sent to the oil return pipe 11, and oil can be prevented from leaking to the outside of the sewing machine frame along the needle bar 10.

In this way, since the oil supply to the sewing machine head and the return flow after the oil supply can be accurately performed, the operability and maintenance performance of the sewing operation can be greatly improved.

The sewing machine lubricating device of the present invention, as mentioned above, is provided with the pump and the pump and The oil path between the oil quantity adjustment mechanism and the oil storage device that returns the excess part of the lubricating oil supplied by the pump to the oil storage mechanism of the sewing machine mentioned above; moreover, the lubricating oil discharge hole on the above oil storage device is provided At a position higher than the above-mentioned oil volume adjustment mechanism, the oil storage device is connected with the upper part of the above-mentioned oil circuit by an oil storage plate arranged at a position higher than the oil volume adjustment mechanism. The distribution pipe and the return pipe used to return the lubricating oil that is excessively sent to the oil storage plate to the oil storage mechanism of the sewing machine are composed, so even when the pump sends lubricating oil exceeding the required amount to the oil quantity adjustment mechanism Also can make this surplus lubricating oil flow back in the oil storage mechanism of sewing machine, make the oil amount regulating mechanism can supply the driving part with the proper amount of lubricating oil through adjustment.

Because the oil storage device can transport the retained oil to the sliding part of the sewing machine after the sewing machine stops, it can solve the problem of insufficient oil in the sliding part when the sewing machine is driven again, and improve the durability of the sewing machine.

Moreover, even when the pump sends air to the oil delivery pipe, since the air can rise in the distribution pipe of the oil storage device and be released to the outside, only an appropriate amount of lubricating oil can always be supplied to the driving part of the sewing machine, thereby enabling Prevents wear, etc. of the sliding parts of the sewing machine.

Claims (3)

1. The oil supply device of the sewing machine has a lubricating oil storage member arranged under the sewing machine body; a pump for outputting the lubricating oil from the lubricating oil storage member; a lubricating oil supply oil circuit arranged between the pump and the sliding part of the sewing machine; The oil quantity adjusting mechanism provided on the above-mentioned lubricating oil supply oil passage for adjusting the supply amount of the lubricating oil supplied to the above-mentioned sliding part is characterized in that a lubricating oil supply oil passage between the pump and the oil quantity regulating mechanism is provided. An oil storage device that is branched off to return excess lubricating oil supplied by the pump to the lubricating oil storage member. 2. The lubricating device of the sewing machine according to claim 1, characterized in that, the lubricating oil discharge hole on the said oil storage device is arranged at a position higher than that of the said oil amount adjusting mechanism. 3. The oil supply device of sewing machine as claimed in claim 1, characterized in that said oil storage device is composed of an oil storage plate arranged at a position higher than the oil quantity regulating mechanism, and the oil storage plate and the oil storage plate The distribution pipe connected to the upper part of the above-mentioned oil passage, and the return pipe used to return the oil storage mechanism of the sewing machine to the lubricating oil sent to the oil storage dish in excess.

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