JPH0966184A - Oil feeding device to upper looper mechanism part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To previously prevent fouling of thread and cloth or the like caused by scattering of oil by instantly recovering oil scratched off from its outer peripheral surface at lowering motion time of a looper bar without staying it in its scratching-off part. SOLUTION: A circular arc-shaped oil groove 20 which bends along a part of an upper half part on an outer peripheral surface of a cylindrical looper guide body 5 rotatably fitted in and held by a circular hole 4 formed in an upper looper guide member 1 and whose upper end 20a faces an upper opening 4A of the circular hole 4, is formed on the upper looper guide member 1 side fixed to a sewing machine frame, and an oil releasing hole 21 is formed so as to extend up to an under surface of the upper looper guide member 1 from the lower end of this circular arc-shaped oil groove 20. A dust dirt removing filter extended up to a lower part of the upper looper guide member 1 is fitted in and held by this oil releasing hole 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for supplying oil to the upper looper mechanism of an overlock sewing machine, and more specifically,
Excessive oil out of the lubricating oil supplied to the outer peripheral surface of the upper looper bar in order to improve high-speed operation performance is scattered around with the vertical sliding motion of the upper looper bar, and the threads and the cloth are contaminated. The present invention relates to an oil supply device for the upper looper mechanism portion configured to prevent such a situation.

[0002]

2. Description of the Related Art FIG. 4 is an exploded perspective view of a main portion of an upper looper mechanism portion in an overlock sewing machine generally used in the past, FIG. 5 is its assembly perspective view, and FIG. 6 is its front view. In these drawings, reference numeral 1 denotes an upper looper guide member fixed to the front surface of the sewing machine frame 2 via a set screw 3, and a circular hole 4 along the cloth feeding direction is provided at the tip of the upper looper guide member 1. Is formed to have oval-shaped openings 4A and 4B which face the upper and lower surfaces of the upper looper guide member 1 above and below. Reference numeral 5 denotes a columnar looper guide body that is rotatably fitted and held in the circular hole 4. The looper guide body 5 is formed with a hole 5A for inserting the looper rod in the radial direction thereof. At the same time, an elongated hole 5B for inserting the refueling felt 6 having a hole 6A having the same diameter as the hole 5A is formed orthogonal to the hole 5A.

Reference numeral 7 is a looper bar inserted through a radial through hole 5A of the looper guide body 5, and an upper looper 8 is fixed to the upper end of the looper bar 7 via a set screw 9. The lower end portion of the looper bar 7 is fixed to the upper looper shaft 10 that reciprocally rotates in conjunction with a sewing machine main shaft (not shown), and the base end thereof is fixed to the free end portion of the upper looper crank 11 that vertically reciprocates. They are connected to each other via a cylindrical pin 12 so as to be rotatable relative to each other, and an oil core 13 is loaded in the hollow portion of the cylindrical pin 12. Reference numeral 14 denotes an oil supply cylinder horizontally arranged below the inside of the sewing machine frame 2 and has an inner end closed to have a notch 14a on its upper side surface, and an oil core 15 is filled inside the oil supply cylinder 15. Lubricating oil that protrudes through the sewing machine frame 2 so as to be in sliding contact with the base end of the looper bar 7 and oozes out from the protruding outer end is also supplied to the oil core 13 loaded in the cylindrical pin 12. Is configured to let.

Next, the operation of the above configuration will be described.
The reciprocating rotation of the upper looper shaft 10 interlocked with the rotation of the main shaft of the sewing machine causes the upper looper crank 11 to oscillate reciprocally as shown by an arrow c in FIG. While the rod 7 slides in the radial through hole 5A of the looper guide body 5 in the vertical direction indicated by the arrow a in FIG. 6, the looper guide body 5 rotates in the circular hole 4 and thereby The looper 8 moves so as to draw a parabolic locus shown by the arrow d in FIG. 6, and cooperates with a needle and a lower looper (not shown) to form an overlock stitch.

During such an overlock sewing operation, the base end of the looper bar 7 is brought into sliding contact with the protruding end of the oil core 15 in the oil supply cylinder 14 so that the oil core 15 can be sewn.
A part of the lubricating oil impregnated in the oil is splashed up, and the lubricating oil impregnated and held in the oil core 13 that contacts the protruding end of the oil core 15 is gradually exuded and adhered to the pin 12. The looper rod 7 which is scattered and sprayed with the reciprocating rotational movement of the pin 12 and slides up and down.
After being supplied and attached to the outer peripheral surface of the lower part of the
The felt 6 is gradually lifted up by the vertical sliding movement of the rod 6 and impregnated into the felt 6, and oil is supplied to the sliding portion between the looper rod 7 and the radial through hole 5A of the looper guide 5 through the felt 6, and Oil is supplied to the relative rotating portion between the outer peripheral surface of the guide body 5 and the circular hole 4 of the upper looper guide member 1 to maintain the high-speed operation performance of the sewing machine.

By the way, when the surplus oil of the lubricating oil attached to the outer peripheral surface of the looper bar 7 and lifted upward is scattered around by the vertical sliding motion of the looper bar 7, looper threads and There is a problem that the material and the like are contaminated, and as a means for solving this problem, conventionally, the actual Kaihei 7-
A surplus oil escape device as disclosed in Japanese Patent No. 283 has been proposed. In the conventional surplus oil releasing device disclosed in the above publication, only a main part of the device is illustrated and described. As shown in FIG. 7, it is loose at a position near the upper opening 4A on the upper surface of the upper looper guide member 1. A concave portion 17 having an inclined surface 16 is provided, and an oil escape hole 18 that penetrates the upper looper guide member 1 from the bottom of the concave portion 17 and communicates with the lower surface of the upper looper guide member 1 is formed. Excess oil that is scattered around and falls along with the vertical sliding motion is collected in the recess 17 and passes through the escape hole 18 to allow the sewing machine frame 2
It is designed to be returned to the inside of the lower part of.

[0007]

However, the conventional surplus oil releasing device disclosed in the above publication cannot sufficiently solve the problem of preventing stains on the looper yarn or the cloth due to the scattering of the surplus oil. The reason is as follows. That is, the outer peripheral surface of the looper bar 7 is rubbed against the upper edge of the through hole 5A of the looper guide body 5 during the downward movement, and the rubbing removes the lubricating oil adhering to the outer peripheral surface of the looper bar 7. . The amount of scraping at one time is extremely small, and it does not reach the periphery due to the vertical movement of the looper rod 7, but if such a phenomenon is repeated by a long sewing operation, the scraping is repeated. The amount of the lubricating oil gradually increased and is accumulated near the outer peripheral surface of the looper guide body 5 (A portion in FIG. 7) at the upper opening 4A of the circular hole 4,
The accumulated surplus oil is scattered around, particularly upward, as the looper rod 7 moves up and down. The conventional surplus oil releasing device disclosed in the above publication does not prevent the surplus oil accumulated in the portion A of FIG. 7 from being scattered upward, but the surplus oil that is scattered and dropped. Recess 1
Since it is just collected and released in 7, if the scattering range is expanded due to, for example, the viscosity of oil decreasing, the problem of preventing stains on threads and fabrics will not be fulfilled, and stain prevention will be ensured. In order to do so, there has been a problem that the installation of a shielding plate as shown in the publication becomes indispensable.

Therefore, the invention according to claim 1 of the present invention has been made in view of the above-mentioned circumstances, and the lubricating oil scraped off at the time of the descending motion of the looper bar is not accumulated, but is immediately moved in a predetermined direction. It is an object of the present invention to provide an oil supply device for the upper looper mechanism part, which can be surely prevented from being contaminated with yarn, cloth and the like due to scattering of excess oil. Another object of the present invention is to provide a device for supplying oil to the upper looper mechanism, which can further improve the function of recovering the surplus oil in the invention described in claim 1. Further, in addition to the object of the invention of claim 1 or claim 2, the invention according to claim 3 provides an upper looper mechanism part capable of preventing dust contained in excess oil from entering the recovery part. The purpose is to provide a refueling device.

[0009]

In order to achieve the above object, an oil supply device for an upper looper mechanism portion according to the invention of claim 1 of the present invention is fixed to a sewing machine frame in an overlock sewing machine. A circular looper guide body is rotatably fitted and held in a circular hole formed in the upper looper guide member, and an upper looper is formed at the upper end of a hole formed by penetrating the looper guide body in the radial direction. A fixed looper bar is slidably inserted, and a lower end of the looper bar is rotatably connected to a free end of an upper looper crank that reciprocally swings in conjunction with the sewing machine main shaft. In an oil supply device for an upper looper mechanism configured to supply lubricating oil to an outer peripheral surface, in the upper looper guide member side, a part of an upper half portion of an outer peripheral surface of the cylindrical looper guide body is provided. Along the bay Then, an arc-shaped oil groove whose upper end faces the upper opening of the circular hole is formed, and an oil escape hole extending from the lower end of the arc-shaped oil groove to the lower surface of the upper looper guide member is formed. The lubricating oil supplied to and attached to the outer peripheral surface of the looper bar and lifted upward by the ascending motion of the looper bar has its outer peripheral surface having a looper guide body during the descending motion of the looper bar. After being scraped off by rubbing on the upper edge of the through hole, the scraped lubricating oil is mainly gravitational force, and in addition to that, the lubricating oil is scraped into the arc-shaped oil groove along with the rotational movement of the cylindrical looper guide body. By the action of the induced negative pressure and the rotational centrifugal force of the looper guide body, it is immediately and smoothly drawn into the arc-shaped oil groove formed on the upper looper guide member side.
It will be collected inside the lower part of the sewing machine frame through the oil escape hole. Therefore, the scraped oil is gradually accumulated in the upper opening of the circular hole on the upper looper guide member side in the vicinity of the outer peripheral surface of the looper guide body, and the surplus oil thus accumulated moves upward during the upward movement of the looper bar. It is possible to prevent scattering.

Further, in the oil supply device for the upper looper mechanism portion according to the invention described in claim 2, in the constitution of the invention described in claim 1, the oil escape hole is a tangential direction of the cylindrical looper guide body. Since the centrifugal force of rotation of the looper guide body acts more strongly on the scraped lubricating oil, the oil flowing down the arc-shaped oil groove and the oil escape hole is formed. It is possible to make the collection function more reliable and quick.

Further, in addition to the configuration of the invention described in claim 1 or 2, the oil supply device for the upper looper mechanism portion according to the invention described in claim 3 has the oil relief hole in the oil relief hole. The configuration is such that a dust removing filter extending from the lower end portion of the lower part to below the looper guide member is fitted and held, and lubrication is performed by flowing down in the arc-shaped oil groove and the oil escape hole. By the filtering action on the oil, it is possible to prevent the dust such as the chips of the cloth contained in the oil from being removed by the filter and prevent the dust from being mixed in the oil recovery unit.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a front view of a main part of a device for supplying oil to the upper looper mechanism of an overlock sewing machine according to the present invention, FIG. 2 is an enlarged vertical front view of the main part of FIG. 1, and FIG. 3 is a line BB of FIG. It is a half cross-sectional view along. The overall structure of the upper looper mechanism of this overlock sewing machine is shown in FIG.
Since they are the same as those shown in FIG. 6, their illustrations are omitted to avoid duplication. Further, the same components as those described with reference to FIGS. 4 to 6 are denoted by the same reference numerals, detailed description thereof will be omitted, and the main points of the present invention, which are different from the conventional ones, will be described. Only the details will be explained.

1 to 3, reference numeral 20 is an upper looper guide member 1 side, and an arc-shaped oil groove formed in the thickness direction at a central portion thereof in a width w: depth h ratio of about 2: 1. The oil groove 20 is curved along a part of the upper half of the outer peripheral surface of the cylindrical looper guide body 5, and the upper end 20a thereof is a circular hole 4 formed in the upper looper guide member 1. Is formed so as to face the upper opening 4A. Reference numeral 21 denotes an oil escape hole formed so as to extend from the lower end of the arc-shaped oil groove 20 toward the lower surface of the upper looper guide member 1 in the tangential direction of the cylindrical looper guide body 5. Reference numeral 22 is a felt-like dust removing filter fitted and retained in the oil escape hole 21, and the filter 22 has a length extending below the upper looper guide member 1. In addition, the upper end portion of the oil escape hole 21 and the lower opening 4 of the circular hole 4
A scraper portion 23, which functions to scrape off the excess oil adhering to the outer peripheral surface of the cylindrical looper guide body 5, is formed between it and B.

Next, the operation of the oil supply device for the upper looper mechanism having the above structure will be described. After the lubricating oil is supplied to and adheres to the lower outer peripheral surface of the looper rod 7 which vertically slides during the overlock sewing operation, it is gradually lifted upward as the looper rod 7 vertically slides and the felt 6 The impregnated lubricating oil is fed to the sliding portion between the looper bar 7 and the radial through hole 5A of the looper guide body 5 through the felt 6, and also passes through the outer peripheral surface of the looper guide body 5. As in the prior art, oil is supplied to the relative rotating portion between the outer peripheral surface and the circular hole 4 of the upper looper guide member 1 to maintain the high-speed operation performance of the sewing machine.

During the overlock sewing operation as described above, of the lubricating oil lifted upward by the vertical sliding movement of the looper bar 7, up to the upper half of the outer peripheral surface of the cylindrical looper guide body 5. The gravity is exerted on the lubricating oil scraped from the outer peripheral surface of the looper rod 7 by being lifted and rubbed by the upper edge of the through hole 5A of the looper guide body 5 when the looper rod 7 descends. Instead, the negative pressure induced in the arc-shaped oil groove 20 formed on the upper looper guide member 1 side due to the rotational movement of the cylindrical looper guide body 5 and the rotational centrifugal force of the looper guide body 5 act. Therefore, the oil rubbed against the upper edge of the through hole 5A of the looper guide body 5 and scraped off immediately flows down into the arc-shaped oil groove 20 and then passes through the oil escape hole 21 to the lower inside of the sewing machine frame 2. Will be collected in In this manner, the scraped oil is not accumulated in the upper opening 4A of the circular hole 4 on the upper looper guide member 1 side in the vicinity of the outer peripheral surface of the looper guide body 5 (portion A in FIG. 2), and Arc-shaped oil groove 20 and oil escape hole 21
Since it is smoothly and quickly recovered inside the sewing machine frame 2 through the above, the stains of the looper thread, the cloth and the like due to the scattering of the accumulated excess oil can be surely prevented.

In particular, since the oil escape hole 21 extends in the tangential direction of the cylindrical looper guide body 5, the rotational centrifugal force of the looper guide body 5 acts more strongly on the scraped oil. As a result, the oil recovery function is reliably and smoothly exhibited. In addition, the oil escape hole 21 is provided in the oil escape hole 21.
Since the dust removing filter 22 that extends from the lower end portion of the lower part to the lower part of the looper guide member 1 is fitted and held, the dust collecting filter 22 can be used to collect the oil that flows down through the arc-shaped oil groove 20 and the oil escape hole 21. And the filtering action is performed, and dust such as the chips of the cloth contained in the oil is filtered by the filter 2.
2 is removed, and it is possible to prevent dust from entering the oil recovery unit.

In the above embodiment, the arc-shaped oil groove 2 is used.
0 and the following oil escape hole 21 are formed only on one side of the cylindrical looper guide body 5. However, such an arc-shaped oil groove 20 and oil escape hole 21 are formed in the cylindrical looper guide body 5. It may be formed on both sides. It is most preferable that the oil escape hole 21 extends in the tangential direction of the cylindrical looper guide body 5, but it may extend in any other direction.

[0018]

As described above, according to the first aspect of the present invention, the upper half of the outer peripheral surface of the cylindrical looper guide is included in the lubricating oil lifted upward by the vertical sliding motion of the looper bar. The oil that has been lifted up to and is scraped up to the upper looper guide by the action of the negative pressure induced in the arc-shaped oil groove due to gravity and the rotational movement of the cylindrical looper guide and the centrifugal force of rotation of the looper guide. It is possible to immediately flow down into the arc-shaped oil groove for recovery without accumulating near the outer peripheral surface of the looper guide body at the upper opening of the circular hole on the member side.
Therefore, it is possible to reliably prevent the scraped oil from being accumulated in the above-mentioned portion, and the surplus oil thus accumulated from being scattered upward due to the movement of the looper bar to stain the yarn or the cloth. Produce an effect.

According to the invention described in claim 2, in the invention described in claim 1, the rotary centrifugal force of the looper guide can be made to act more strongly, and the oil recovery function can be more reliably exhibited. Can be made.

Further, according to the third aspect of the present invention,
In addition to the effect of the invention of claim 1 or claim 2, due to the filtering action on the oil collected by flowing down through the arc-shaped oil groove and the oil escape hole, the chips of the dough contained in the oil are removed. It is possible to prevent a defective situation in which dust is removed by a filter and dust is mixed in the oil recovery unit.

[Brief description of drawings]

FIG. 1 is a front view of an essential part of an oil supply device for an upper looper mechanism according to the present invention.

FIG. 2 is an enlarged vertical sectional front view of a main part of FIG.

FIG. 3 is a half sectional view taken along the line BB of FIG.

FIG. 4 is an exploded perspective view of a main part of an upper looper mechanism part in a commonly used overlock sewing machine.

5 is an assembly perspective view of FIG. 4. FIG.

FIG. 6 is a front view of FIG. 5;

FIG. 7 is an enlarged vertical sectional front view of a main part showing a surplus oil escape device in a conventional overlock sewing machine.

[Explanation of symbols] 1 upper looper guide member 2 sewing machine frame 4 circular holes 4A, 4B upper and lower openings 5 looper guide body 5A through hole 7 looper rod 8 upper looper 11 upper looper crank 20 arcuate oil groove 21 oil escape hole 22 dust Removal filter

Claims (3)

[Claims] 1. A column-shaped looper guide is rotatably fitted and held in a circular hole formed in an upper looper guide member fixed to a sewing machine frame of an overlock sewing machine, and the looper guide is radially arranged. A looper rod having an upper looper fixed at its upper end is slidably inserted into a hole formed through the upper looper, and the lower end of this looper rod reciprocally swings in conjunction with the main shaft of the sewing machine. An oil supply device for the upper looper mechanism portion, which is connected to the upper looper guide member side so as to be relatively rotatable and is configured to supply lubricating oil to the outer peripheral surface of the looper bar. An arc-shaped oil groove that curves along a part of the upper half of the outer peripheral surface of the looper guide body and whose upper end faces the upper opening of the circular hole is formed. Above Fueling device to the looper mechanism on, characterized in that the oil escape hole extending to the lower surface of the path guide member is formed. 2. The oil supply device for the upper looper mechanism portion according to claim 1, wherein the oil escape hole is formed so as to extend in a tangential direction of the cylindrical looper guide body. 3. A dust removing filter extending from a lower end portion of the oil escape hole to a position below the upper looper guide member is fitted and held in the oil escape hole. Lubrication device for the upper looper mechanism.