JP4452895B2 - Oil leak prevention device for upper looper mechanism - Google Patents

Description

  The present invention relates to an oil leakage prevention device for an upper looper mechanism in an overlock sewing machine, and more particularly, of the lubricating oil supplied to the outer peripheral surface of the upper looper base in order to improve high-speed operation performance, excess lubricating oil is the upper looper base. The present invention relates to an oil leakage prevention device for an upper looper mechanism which is configured to leak and scatter to the surroundings, in particular, to the upper portion of the upper looper guide member as it slides up and down. More specifically, an upper looper guide member fixed to the sewing machine frame, and a cylindrical upper looper guide body rotatably fitted and held around the center of the circle in a circular hole formed in the upper looper guide member. And an upper looper base that is slidably inserted into a hole formed through the upper looper guide body in the radial direction, and the upper looper is fixed to the upper end of the upper looper guide body, and the upper looper base is connected to the upper looper shaft. A link mechanism for connecting the lower end of the upper looper base to the upper looper shaft in an interlocked manner so as to slide up and down while tilting around the center of the circle guided by the upper looper guide body in reverse reciprocal rotation; The present invention relates to an oil leakage prevention device for an upper looper mechanism, which is provided with lubricating oil supply means to the outer peripheral surface of the upper looper base.

  As an oil leakage prevention device for this type of upper looper mechanism, conventionally, an excess of lubricating oil that is supplied and attached to the outer peripheral surface of the upper looper base and lifted when the upper looper base is lifted is formed in the upper looper guide body. Scrap off the peripheral edge of the hole at the upper end of the hole, so that the excess lubricant is scraped to the upper opening of the circular hole formed in the upper looper guide member so that the cylindrical upper looper guide body can be rotatably fitted and held. The upper looper guide body is accumulated at the upper end in an oil groove that is curved in an arc shape along the upper half peripheral surface, and the accumulated excess lubricating oil is caused by gravity and rotational movement of the upper looper guide body. It is known that it is configured to recover (oil drain) to the lower part of the sewing machine frame through an oil relief hole connected to the lower end of the arcuate oil groove by the negative pressure induced in the arcuate oil groove. (For example, refer to Patent Document 1).

  In addition, conventionally, a through hole formed in the upper looper guide body and a circular hole formed in the upper looper guide member are provided with the lubricating oil that is supplied and adhered to the outer peripheral surface of the upper looper table and lifted when the upper looper table is raised. The excess lubricating oil scraped off at the periphery of the hole intersecting with the nozzle is accumulated in the opening around the upper end of the through hole, and the excess lubricating oil accumulated in the opening is removed from the side surface of the upper looper guide body. And a pair of through holes that are openly connected to the lower corner portion of the counterbore and a pair of grooves that are formed in the left and right positions on the outer peripheral surface of the upper looper guide member in parallel with the through holes. And the oil drainage passage which is branched from the middle portion of the through hole and opens to the peripheral edge of the upper end of the through hole and the oil circulation hole formed in the sewing machine frame and connected to the oil drainage hole. Forced recovery (forced oil draining) It is also known that configured to (e.g., see Patent Document 2).

  JP-A-9-66184   JP 2004-187940 A

  In any of the conventional oil leakage prevention devices for the upper looper mechanism described above, the excess lubricating oil adhering to the outer peripheral surface of the upper looper base is divided into the outer peripheral surface of the upper looper base and the peripheral edge of the hole of the upper looper guide member. Since it is scraped by a so-called metal touch that comes into sliding contact, it ensures a sufficient and sufficient scraping action so that excess lubricant does not splash upward, and the outer peripheral surface of the upper looper base and the peripheral edge of the hole of the upper looper guide member It is necessary to set the clearance between the two very finely and appropriately so as not to cause seizure or the like with (or the through hole). However, no matter how fine and appropriate the clearance is set, wear occurs between the two according to the use of the sewing machine, the clearance increases with the wear, and the scraping action of excess lubricating oil deteriorates over time. As a result, the amount of lubricating oil splashed upward, and further flowing down to the outer peripheral surface of the upper looper base and flowing downward to contaminate the sewing machine frame and the like, and the predetermined oil leakage prevention function gradually decreases. There is.

  Further, in the above conventional apparatus, the scraped excess lubricating oil is curved and formed in an arc shape along the upper half circumferential surface of the upper looper guide body in the upper part of the cylindrical upper looper guide body (in the case of Patent Document 1). The upper end of the oil groove, and in the case of Patent Document 2, it is once in the opening around the upper end of the through-hole formed in the upper looper guide body) and then forced by gravity and negative pressure or pump Since it is collected (oil drained) by suction force, dust such as lint and fabric chips scattered and dropped from the upper part of the upper looper guide body is mixed into the accumulated excess lubricating oil. As a result, the amount of excess lubricant stored in the upper part of the cylindrical upper looper guide body gradually increases, and the predetermined oil leakage prevention function is quickly and quickly performed. There was a problem that it dropped.

The present invention has been made in view of the above-described circumstances, and always exerts the scraping action of surplus lubricating oil surely and satisfactorily, and prevents dust from being mixed into the surplus lubricating oil, thereby providing a predetermined oil leakage preventing function for a long period of time. Can be maintained stably over time, and the surplus lubricating oil can be used effectively to maintain the lubricating performance of the up and down movement of the upper looper base . In addition, surplus lubrication when the amount of lubrication is increased in response to the high speed operation of the sewing machine It is an object of the present invention to provide an oil leakage prevention device for an upper looper mechanism capable of rationally discharging oil .

To achieve the above object, leakage oil prevention device of the looper mechanism on according to the invention described onset Ming請 Motomeko 1, and the looper guide member on the fixed machine frame, formed in the upper looper guide member A cylindrical upper looper guide body that is rotatably fitted and held around the center of the circle, and a hole formed through the upper looper guide body in the radial direction. The upper looper base with the upper looper fixed to the upper end thereof, and the upper looper base is tilted around the center of the circle by being guided by the upper looper guide body as the upper looper shaft rotates forward and backward. An upper looper mechanism comprising: a link mechanism for connecting the lower end of the upper looper base to the upper looper shaft so as to be slid up and down, and means for supplying lubricating oil to the outer peripheral surface of the upper looper base. An oil leakage prevention device, wherein the columnar upper looper In the inner body, two upper and lower long holes are formed in a penetrating state perpendicular to the through hole, and the upper through long hole is elastically slidably contacted with the outer peripheral surface of the upper looper base. An oil seal ring formed with an elastic lip that scrapes off excess lubricant adhering to the upper surface and a dust seal elastic lip for preventing dust from entering from the upper portion of the upper looper guide body into the through hole is fitted. On the other hand, an oil absorption ring capable of absorbing and holding excess scraped oil is fitted in the lower through-hole , and one end is formed on the sewing machine frame with being connected to the suction pump. The other end suction port of the drained oil hole is connected to the lower through hole and is configured to forcibly recover the excess lubricating oil absorbed and held in the oil absorbing ring through the drained hole. It is characterized by.

According to the first aspect of the present invention having the characteristic configuration as described above, an excess amount of the lubricating oil adhering to the outer peripheral surface of the upper looper base is made elastic by the outer peripheral surface of the upper looper base and the elastic lip of the oil seal ring. Scraping with a so-called non-metal elastic touch, so that they are in close contact with the proper clearance so that no extra space is created between them (the outer surface of the upper looper base and the lip). As a result, it is possible to ensure that the excess lubricating oil is scraped off sufficiently and to prevent the lubricating oil from scattering upward. In addition, the excess lubricating oil scraped off by the elastic lip of the oil seal is immediately absorbed and held by the oil absorbing ring disposed at the lower part of the oil seal, thereby eliminating dust contamination in the excess lubricating oil, or It is possible to reduce the amount of excess lubricating oil to the upper looper base outer peripheral surface and the through hole inner peripheral surface, and to flow downward and contaminate the sewing machine frame and the like. Therefore, the predetermined oil leakage prevention function can be stably maintained over a long period of time. In addition, since a part of the excess lubricating oil absorbed and held by the oil absorbing ring can be re-supplied to the outer peripheral surface of the upper looper base and circulated and used for lubricating the upper looper base, a small amount of lubricating oil is used as a whole. In addition, the up-and-down movement of the upper looper base can be maintained smoothly over a long period of time .

In addition, if the amount of oil supplied to the upper looper base is increased so that the lubrication performance of the upper looper base can be kept good during high-speed operation of the sewing machine, the amount of excess lubricating oil scraped off will increase. Since it is possible to forcibly collect and drain oil through the oil drain hole via suction force, it is possible to rationally prevent excess lubricating oil from scattering upward and dripping downward, thereby preventing the expected oil leakage. A significant improvement can be achieved .

Moreover, the oil seal ring, in addition to the scraping resilient lip surplus lubricating oil has a dust seal elastic lip to prevent dust from entering from the upper portion of the upper looper guide member into said through hole Therefore, the use of a single oil seal ring simplifies the structure and assembly, while the dust falling from the upper part is scraped from the elastic lip for scraping in the through hole and the outer periphery of the upper looper guide body. There is an effect that it is possible to prevent the occurrence of problems such as intrusion into the surface and causing such wear, or mixing into surplus lubricating oil that is scraped off and causing deterioration in lubrication performance .

Further, in the oil leakage prevention apparatus for the upper looper mechanism according to the invention described in claim 1, as described in claim 2 , the dust seal elastic lip is located at an upper position than the oil seal ring. When the oil seal ring fitted in the through-hole of the body is formed separately from the dust seal ring, the fitting of the oil seal ring having an elastic lip for scraping excess lubricating oil from the upper part of the upper looper guide body It is possible to reliably prevent dust from entering the landing position and further enhance the effect of preventing the occurrence of the above problems.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing the entire sewing machine frame 1 in an overlock sewing machine in which the oil leakage prevention device of the upper looper mechanism according to the present invention is incorporated, with a cover (not shown) attached to the front surface thereof removed. The upper looper mechanism 2 appears on the front surface of the sewing machine frame 1.

  2 is an exploded perspective view of the upper looper mechanism 2, FIG. 3 is an assembled perspective view of the upper looper mechanism 2, and FIG. 4 is a front view of the upper looper mechanism 2. In these drawings, reference numeral 3 denotes an upper looper guide member fixed to the front surface of the sewing machine frame 1 via a set screw 4. A circular hole 5 along the cloth feeding direction is formed at the tip of the upper looper guide member 3. Are formed in a state having openings 5A, 5B facing the upper and lower surfaces of the upper looper guide member 3 on the upper and lower sides thereof. A cylindrical looper guide body 6 is fitted and held in the circular hole 5 so as to be rotatable around the center of the circle. The cylindrical looper guide body 6 is in a state of penetrating in the radial direction. A through hole 7 is formed, and an axial upper looper base 8 is slidably inserted into the through hole 7.

  An upper looper 10 is fixed to the upper end portion of the upper looper base 8 via a set screw 9, and the lower end portion of the upper looper base 8 is rotated in a forward and reverse reciprocating manner in conjunction with a sewing machine main shaft (not shown). The base end of the upper looper shaft 11 is fixed to the other end portion of the upper looper crank 13 which is fixed to the upper looper shaft 11 by a fastening screw 12 and reciprocally swings in the vertical direction (arrow ud direction in FIG. 4). The upper looper crank 13 and the cylindrical pin 14 guide the upper looper base 8 to the upper looper guide body 6 as the upper looper shaft 11 rotates forward and backward. A link mechanism is configured to slide up and down while tilting around the center of the circle.

  The hollow portion of the cylindrical pin 14 constituting the link mechanism is filled with an oil core 15 impregnated with lubricating oil, and is horizontally disposed and fixed at a lower position inside the sewing machine frame 1, and a notch is formed on the upper surface thereof. An oil core 17 is also loaded into the oil cylinder 16 having the portion 16a, and one end of the oil core 17 is slightly projected from the end surface of the oil cylinder 16 so as to be in sliding contact with the lower end of the upper looper base 8. ing. Due to these components, one of the lubricating oils impregnated in the oil core 17 when the lower end of the upper looper base 8 is slidably contacted with the protruding end of the oil core 17 during sliding up and down. As the part springs up and intermittently contacts the protruding end of the oil core 17, it shifts to the oil core 15 side, and the lubricating oil held in the oil core 15 gradually oozes out to the pin 14. Lubricating oil supply means that functions to supply the lubricating oil to the outer peripheral surface 8a of the upper looper base 8 is formed by adhering, and the adhering lubricating oil is scattered and sprayed with the reciprocating rotation of the pin 14. is doing.

  In the upper looper mechanism 2 of the overlock sewing machine having the basic configuration as described above, the cylindrical upper looper guide body 6 is orthogonal to the radial through hole 7 as clearly shown in FIGS. The upper and lower elongated holes 19 and 20 are formed in a penetrating state in the thickness direction of the upper looper guide body 6. Of the two through-holes 19 and 20, the upper through-hole 19 is elastically slidably contacted with the outer peripheral surface 8a of the upper looper base 8 and supplied by the above-described lubricating oil supply means. An elastic lip 21a that scrapes off excess lubricant adhering to 8a and a dust seal elastic lip 21b that prevents dust from entering the through-hole 7 from the upper part of the upper looper guide 6 are provided on the inner peripheral surface side. An oil seal ring 21 formed integrally with is attached.

  On the other hand, a felt that can absorb and retain excess lubricating oil scraped off by the elastic lip 21a of the oil seal ring 21 and flowing down along the inner peripheral surface of the through hole 7 in the lower through hole 20. An oil absorbing ring 22 made of or the like is fitted.

  Further, as shown in FIG. 1, the sewing machine frame 1 is formed with an oil drain hole 23 having a length extending from the lower end portion to the vicinity of the tip end portion of the upper looper guide member 3 in an inclined state. The lower end portion of the oil drain hole 23 is connected to a pump (not shown) such as a trochoid pump or a gear pump via an oil drain pipe (not shown), and the upper end portion is clearly shown in FIG. A suction port 24 that is openly connected to the lower through-hole 20 formed in the upper looper guide body 6 is perforated and formed perpendicular to the oil discharge hole 23, and is thereby absorbed and held by the oil absorption ring 22. The excess lubricating oil is forcibly recovered (oil drained) from the suction port 24 through the oil draining hole 23.

Next, the operation of the overlock sewing machine provided with the oil leakage prevention device of the upper looper mechanism 2 having the above configuration will be described.
When the upper looper crank 13 reciprocally swings in the direction of the arrow ud in FIG. 4 in accordance with the forward / reverse reciprocating rotation of the upper looper shaft 11 interlocked with the rotation of the sewing machine main shaft (not shown), the upper looper crank 13 is reciprocated. The upper looper base 8 slides up and down in the through-hole 7 of the upper looper guide body 6 in the direction of the arrow u1-d1 of FIG. To reciprocate around the center of the circle. As a result, the upper looper 10 moves so as to draw a parabolic locus as shown by an arrow a in FIG. 4, and forms an edge stitch in cooperation with a needle and a lower looper (not shown).

  In such edge-over stitching operation, the oil core 17 is caused by the lower end of the upper looper base 8 being slidably contacted with the protruding end of the oil core 17 in the oil supply cylinder 16 when the upper looper base 8 is slid up and down. Part of the lubricating oil impregnated into the oil core is splashed up, and the lubricating oil retained on the oil core 15 gradually oozes out from the oil core 17 and adheres to the pins 14. The adhering lubricating oil is scattered in a sprayed manner with the reciprocating rotation of the pin 14, and the lubricating oil is supplied to the outer peripheral surface 8a of the upper looper base 8 and adheres to the outer peripheral surface 8a. Thereby, it is possible to keep the lubricity of sliding up and down of the upper looper base 8 in the upper looper mechanism 2 well.

  And since the surplus portion of the lubricating oil adhering to the outer peripheral surface 8a of the upper looper base 8 is scraped off by the elastic touch between the outer peripheral surface 8a of the upper looper base 8 and the elastic lip 21a of the oil seal ring 21, It is possible to prevent the surplus lubricating oil from being scattered (oil leakage) above the upper looper guide body 6 and the upper looper guide member 3 and causing the yarns and fabrics to become dirty.

  Further, surplus lubricating oil scraped off from the outer peripheral surface 8 a of the upper looper base 8 by the elastic touch with the elastic lip 21 a of the oil seal 21 and flowing down to the inner peripheral surface of the through hole 7 is the oil seal 21. The oil is immediately absorbed and held by the oil absorbing ring 22 disposed at the lower part of the sewing machine. As a result, excess lubricating oil flows downward along the outer peripheral surface 8a of the upper looper base 8 and the inner peripheral surface of the through-hole 7, and the sewing machine frame 1 and the like can be prevented from being soiled, and the lubricating oil absorbed and held by the oil absorbing ring 22 is supplied again to the outer peripheral surface 8a of the looper base 8 above the inner peripheral surface of the oil absorbing ring 22. Since it is circulated and used for lubricating the up-and-down movement of the upper looper base 8, there is no waste of lubricating oil, and the up-and-down movement of the upper looper base 8 is maintained smoothly over a long period of time while using a small amount of lubricating oil as a whole. Can It is a function.

  Furthermore, dust such as lint that scatters and drops from the upper portion of the upper looper guide member 3 is prevented from entering the through hole 7 by the elastic lip 21b formed integrally with the oil seal 21, The dust enters between the outer peripheral surface 8a of the upper looper base 8 and the inner peripheral surface of the through-hole 7 and causes them to wear, or is mixed into surplus lubricating oil that is scraped off and causes a decrease in lubricating performance. It is possible to prevent the occurrence of malfunctions.

  As described above, maintenance of lubricity by constantly supplying lubricating oil, and prevention of soiling of yarns and fabrics due to splashing upward of the lubricating oil, that is, an oil leakage preventing function and a circulation reuse function of excess lubricating oil The operation of the overlock sewing machine can be maintained smoothly and stably over a long period of time by synergy with the dust intrusion into the through hole 7 and the function of preventing dust from entering into the excess lubricating oil.

  In addition, when the movement speed of the sewing machine is high, the amount of oil supplied to the upper looper base 8 by the above-described lubricating oil supply means is increased, whereby the lubricating performance of the upper looper base 8 is kept good, As the amount of oil supplied to the upper looper base 8 increases, the amount of excess lubricating oil scraped off by the elastic lip 21a of the oil seal 21 increases. In this case, the excess lubricating oil is sucked into the lower through-hole 20 through the suction port 24 of the oil drain hole 23 via the suction force of a pump (not shown) and can be forcibly recovered (oil drained). As a result, it is possible to reasonably prevent the excess lubricating oil from scattering upward and drooping downward to reliably exhibit the desired oil leakage prevention effect.

  In the above embodiment, the dust seal elastic lip 21b is formed integrally with the surplus lubricating oil scraping elastic lip 21a on the oil seal ring 21. However, as shown in FIGS. Even if the dust seal ring 25 with the elastic lip 25 a is provided separately from the oil seal ring 21, the dust seal 25 is fitted in the through hole 7 of the upper looper guide body 6 at a position higher than the oil seal ring 21. Good. In this case, the dust scattered and dropped from the upper part of the upper looper guide body 6 and the upper looper guide member 3 enters the fitting position of the oil seal ring 21 having the elastic lip 21a for scraping excess lubricating oil. To prevent the above problems, that is, dust may enter between the outer peripheral surface 8a of the upper looper base 8 and the inner peripheral surface of the through-hole 7 to cause wear or scraping. It is possible to further enhance the effect of preventing the occurrence of malfunctions that are mixed into excess lubricating oil and cause a reduction in lubricating performance.

  In the above embodiment, the oil drain hole 23 connected to the pump is formed in the sewing machine frame 1. However, when the excess lubricant is generated in a small amount, the oil drain hole 23 is not formed. Thus, a small amount of excess lubricating oil absorbed and held by the oil absorbing ring 22 may be re-supplied from the inner peripheral surface of the oil absorbing ring 22 to the outer peripheral surface 8a of the upper looper base 8 and recycled.

  Further, as shown in the above embodiment, the oil drain hole 23 of the sewing machine frame 1 is in a straight inclined state with a length extending from the lower end of the sewing machine frame 1 to the vicinity of the tip of the upper looper guide member 3. Although it is shown with a hole formed, it is not limited to this, and it is formed by combining a hole formed in a horizontal state with a slight inclination and a hole formed in a vertical state connected to this hole. It may be what was done.

It is a front view which shows the whole sewing machine frame in the overlock sewing machine with which the oil leak prevention apparatus of the upper looper mechanism which concerns on this invention was integrated in the removal state of a front cover. It is a disassembled perspective view of an upper looper mechanism. It is an assembly perspective view of a looper mechanism same as the above. It is a front view of a looper mechanism same as the above. It is an enlarged front view of the principal part of a looper mechanism same as the above. It is a longitudinal cross-sectional view along the XX line of FIG. It is a vertical side view of the vicinity of the built-in part of the upper looper mechanism. It is an enlarged front view of the principal part in another embodiment. It is a longitudinal cross-sectional view along the YY line of FIG.

DESCRIPTION OF SYMBOLS 1 Sewing machine frame 2 Upper looper mechanism 3 Upper looper guide member 5 Circular hole 6 Upper looper guide body 7 Through hole 8 Upper looper base 8a Outer surface 10 of upper looper base Upper looper 11 Upper looper shaft 13 Upper looper crank element)
15, 17 Oil core (main element of lubricating oil supply means)
19, 20 Through long hole 21 Oil seal ring 21a Elastic lip 21b, 25a for scraping excess lubricating oil 22 Dust seal elastic lip 22 Oil absorbing ring 23 Oil draining hole 24 Suction port 25 Dust seal ring

Claims (2)

An upper looper guide member fixed to the sewing machine frame, a columnar upper looper guide body rotatably fitted around and held in a circular hole formed in the upper looper guide member, The upper looper base with the upper looper fixed to the upper looper base and the upper looper base for forward and reverse reciprocating rotation of the upper looper shaft is slidably inserted into a hole formed through the looper body in the radial direction. And a link mechanism for connecting the lower end of the upper looper base to the upper looper shaft so as to slide up and down while tilting around the center of the circle guided by the upper looper guide body, and the upper looper base An oil leakage prevention device for an upper looper mechanism comprising a lubricating oil supply means to the outer peripheral surface of
In the cylindrical upper looper guide body, two upper and lower long holes are formed in a penetrating state perpendicular to the through hole, and the upper through long hole is elastically formed on the outer peripheral surface of the upper looper base. An oil seal ring having an elastic lip that slides and scrapes off excess lubricant adhering to the outer peripheral surface and a dust seal elastic lip for preventing dust from entering the through hole from an upper portion of the upper looper guide body On the other hand, an oil absorbing ring capable of absorbing and holding the surplus lubricating oil scraped off is fitted in the lower through long hole , and one end is connected to the suction pump. The other end suction port of the oil drainage hole formed in the sewing machine frame is connected to the lower through hole so as to forcibly recover the excess lubricating oil absorbed and held in the oil absorbing ring through the oil drainage hole. and features that you are Oil leakage prevention device of the looper mechanism on that. 2. The dust seal elastic lip is formed in a dust seal ring separate from the oil seal ring fitted in the through hole of the upper looper guide body at an upper position than the oil seal ring. Oil leak prevention device for upper looper mechanism.

Images