KR20090031281A - Oil pump apparatus for sewing machines - Google Patents

Abstract

An apparatus consisting of an upper pump and a lower pump for pumping oil of a sewing machine is provided to prevent degradation of induction performance through air in an induction port of an upper pump. An apparatus(1) for pumping oil of a sewing machine includes the followings: a rotor shaft(6) operating and rotating with a main shaft of the sewing machine; pumps(2,3) rotating in each rotor chamber of each casing(21); a suction port inhaling lubricating oil and discharging the oil through to each part of the sewing machine; and a refueling path connecting with a pump chamber and the rotor chamber of the upper casing. A part of the lubricating oil is supplied to the rotor chamber of the upper casing through the refueling path.

Description

Oil pump unit of sewing machine {OIL PUMP APPARATUS FOR SEWING MACHINES}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an oil feed pump device for a sewing machine that supplies lubricating oil to respective parts inside the sewing machine frame in an industrial sewing machine such as an overlock sewing machine or a flat rod sewing machine.

Background Art Conventionally, in industrial sewing machines, oil lubrication of movable parts such as needles, loopers, transfer gears, and the like has been performed in order to meet the demand for higher sewing speed. Such oil lubrication is provided by the drive of the oil feed pump apparatus which is provided in the inner lower part of the sewing machine frame, and rotates in association with rotation of a main shaft. That is, the oil passage connected to the discharge port of the oil pump device is extended to each movable part interspersed in the sewing machine frame, while the oil return path connected to the suction port of the oil pump device is connected to the recovery port of the lubricating oil installed near each movable part. The lubricating oil is discharged to the oil passage by driving the oil feed pump device, and the movable portion is lubricated by ejecting from the powdered mouth formed at the middle part and the end of the oil passage so as to correspond to each movable part. The lubricated oil which has been lubricated is recovered from the recovery port via the oil return path through the suction port of the oil feed pump device and sucked back into the oil feed pump device (see Patent Documents 1 and 2, for example).

Specifically, as shown in FIG. 5 and FIG. 6, the oil feed pump device 1 is constituted by two-stage pumps of the lower pump 2 and the upper pump 3 which are arranged in succession up and down, and each pump 2 (3) is a well-known trocoid pump which accommodates the rotor which consists of the outer rotor 4 and the inner rotor 5 in the inside of the lower casing 21 and the upper casing 31 joined up and down, respectively.

That is, in each of the pumps 2 and 3, the outer rotor 4 is an annular member fitted therein so as to be able to rotate freely coaxially in the rotor chambers of circular cross sections provided in the casings 21 and 31, and the inner circumferential surface thereof. In the plural (five in the figure), the valleys are evenly arranged. In addition, the inner rotor 5 is disposed inside the outer rotor 4 provided in each of the casings 21 and 31 so as to be freely rotatable by the rotor shaft 6 eccentric to them. The outer circumferential surface has a shape corresponding to the valleys of the outer rotor 4, and a number of peaks (four in the drawing) that are smaller than the valleys are equally arranged, one of which is the outer rotor 4 in the direction of the eccentricity. It is supposed to be coupled to one of the valleys.

The rotor shaft 6 protrudes above the upper casing 31 of the upper pump 3, and a worm wheel 7 as a driven gear is fitted to this protruding end. The position at which the worm wheel 7 is fitted and mounted is set so as to intersect at right angles to the middle portion of the main shaft S in a state where the oil pump 1 is attached to the inside of the sewing machine frame F. At this intersection, the worm wheel 7 is engaged with the worm (drive gear) 8 provided at the corresponding position of the main shaft S. As shown in FIG.

Moreover, the main shaft S protrudes outward of the sewing machine frame F, and the belt pulley 9 is fitted in the protrusion edge part, and is attached. Then, the belt 10 is wound around the belt pulley 9 provided on the main shaft S and the belt pulley provided on the output shaft of the sewing machine motor (not shown), and the main shaft S rotates the belt from the sewing machine motor. Is rotated (see Fig. 8).

Accordingly, the rotor shaft 6 is driven to rotate in accordance with the rotation of the main shaft S transmitted through the worm 8 and the worm wheel 7, and by this rotation, the rotor shaft 6 is provided inside the upper and lower casings 31 and 21. Each inner rotor 5 rotates. Such rotation of the inner rotor 5 is transmitted to the outer rotor 4 through the valleys coupled to the ridges evenly disposed on the outer circumferential surface of the inner rotor 5, and the outer rotor 4 also moves together with the inner rotor 5. Rotate

Here, since the valley of the outer rotor 4 is one more than the peak of the inner rotor 5, the rotation of the inner rotor 5 is adjacent to the peak of the outer rotor 4 as shown in FIG. 6. The cross-sectional area (volume) of the pump chamber P sandwiched between is gradually changed within one rotation.

In each casing (21, 31), the suction ports (2a, 3a) in the half of the side where the volume of the pump chamber (P) increases, and the discharge ports (2b, 3b) in the half of the side that is similarly reduced. In the pump chamber P, each of which is formed and whose volume changes with the rotation of the inner rotor 5 and the outer rotor 4, oil is sucked while in the rotational position to match the suction ports 2a, 3a, After confined within the maximum volume, a pump action is performed to discharge to the discharge ports 2b and 3b.

The suction port 2a of the lower pump 2 communicates with the lower surface suction inlet of the lower casing 21 through the filtering net, and the discharge port 2b discharge port 21b opened to the outer surface of the lower casing 21. ) (See FIG. 5).

In addition, the suction port 3a of the upper pump 3 is connected to the suction port 31a opened in the outer surface of the upper casing 31 (refer FIG. 5), and the discharge port 3b is shown in FIG. As described above, both ends of the upper casing 21 communicate with the discharge grooves 211 formed at the outer surfaces thereof.

In this oil feed pump apparatus 1, as shown in FIG. 8, one end of the oil feed pipe P1 is connected to the discharge port 21b of the lower pump 2, and is extended to the top of the sewing machine frame F. The other end of the oil feed pipe P1 is connected to the inlet side of the oil filter f fixedly supported at the position. The outlet side of the oil filter f is perforated in the sewing machine frame F and communicates with the oil passage P2 branched up and down, among which the oil passage P2 branched below is the main shaft S. The flow path P2 communicating with the arrangement position of the sliding bearing j supporting the intermediate part and branching upward is connected to the injection nozzle N opened in the upper space of the sewing machine frame F, and sewing machine frame It is connected to the oil supply pipe P3 extended to the lower part of (F). The oil feed pipe P3 is bent at the lower end and extends to the lower tip side of the sewing machine frame F to communicate with an arrangement position of a sliding bearing (not shown) supporting the tip end of the main shaft S, and the shaft center portion of the main shaft S. It is further communicated with an oil passage not shown formed in the.

In addition, one end of the oil return pipe P5 is connected to the suction port 31a of the upper pump 3, and the oil return pipe is bent upward and extended to the upper end side of the sewing machine frame F, not shown. Is in communication with the needle bar.

Moreover, the discharge groove 211 which is the discharge port of the upper pump 3 is opened, and the lubricating oil is ejected from the opening end to the periphery.

Next, operation | movement of the oil feed pump apparatus 1 comprised in this way is demonstrated.

First, the rotation of the main shaft S by belt transmission from the sewing machine motor is transmitted to moving parts such as needles, loopers, transfer gears, etc. through known transmission means (not shown), and sewing is performed by a linking operation of these moving parts. .

At this time, the rotation of the main shaft S is transmitted to the rotor shaft 6 of the oil feed pump device 1 through the worm 8 and the worm wheel 7, and in conjunction with the rotation of the rotor shaft 6 In the rotor chambers of the casings 21 and 31 of the lower pump 2 and the upper pump 3 constituting the oil feed pump device 1, the rotor comprising the inner rotor 5 and the outer rotor 4 is provided. By the pump action according to the rotation, the lubricating oil is discharged to the oil supply pipe (P1) connected to the discharge port (21b) of the lower pump (2), the lubricant is ejected to the surroundings through the discharge groove 211 which is the discharge port of the upper pump (3) It is stored in the bottom part of the sewing machine frame F which functions as an oil pan.

The lubricating oil discharged to the oil feed pipe (P1) is cleaned through the oil filter (f), introduced into the oil feed path (P2) and distributed up and down, and the distribution oil to the lower side slides to support the middle part of the main shaft (S). It is led to the arrangement position of the bearing j, and it is lubricated by the sliding surface of this sliding bearing j and the main shaft S, and lubricates this sliding surface.

Moreover, most of the distribution oil to the upper side is sent to the lower front end side of the sewing machine frame F via the oil feed pipe P3, and although not shown in detail, it is in the arrangement position of the sliding bearing which supports the front end of the main shaft S. Guided to the sliding surface of the sliding bearing and the main shaft S, lubricating the sliding surface, guided to each part in the axial length direction by an oil passage provided in the shaft center portion of the main shaft S, Lubricates movable parts such as needles, loopers, and transfer gears. Moreover, the remainder of the distribution oil to the upper side is injected from the injection nozzle N into the upper space of the sewing machine frame F, and performs lubrication of movable parts, such as a needle arrange | positioned in this space.

In this way, the lubricating oil for lubricating the respective parts is collected at the bottom of the sewing machine frame F functioning as an oil pan, and then the lower surface suction port is closed by the pumping action of the lower pump 2 immersed in the recovered lubricating oil. It is sucked in through, boosted up again and circulated.

On the other hand, the lubricating oil supplied to the upper space is recovered to the intake port 31a of the upper pump 3 through the oil return pipe P5, and is discharged again from the discharge groove 211 of the lower casing 2, which is the discharge port. Squirt.

[Patent Document 1] Japanese Unexamined Patent Publication No. 2004-166737

[Patent Document 2] Japanese Utility Model Publication No. 3-31272

By the way, the above-mentioned oil feed pump apparatus is comprised by two layers of a lower pump and an upper pump, and the discharge port of an upper pump is comprised by the discharge groove formed by opening both ends in the upper surface of the lower casing. On the other hand, a small gap is secured between the rotor chamber of the upper casing and the outer rotor and the inner rotor that rotate in the rotor chamber to allow rotation. Accordingly, when sufficient lubricating oil is not recovered in the suction port of the upper pump, both ends are opened on the upper surface of the lower casing, and the discharge groove which becomes the discharge port of the upper pump, the rotor chamber of the upper casing, the outer rotor and the inner rotor are minutely formed. There is a risk of air entering the suction port of the upper pump through one gap. If air enters the suction port, the suction performance of the lubricating oil of the upper pump is lowered, and the number of lubricating oils supplied to the upper space of the sewing machine frame is also reduced, thereby increasing the deterioration of the suction performance.

The present invention has been made in view of the above problems, and in the oil feed pump device composed of two layers of a lower pump and an upper pump, a sewing machine which can reliably prevent air from entering the suction port of the upper pump and deteriorate the suction performance. It is to provide an oil pump unit.

The present invention, the rotor shaft is rotated in conjunction with the rotation of the sewing machine main shaft, the lower rotor and the upper rotor installed on the rotor shaft consists of a pump of the upper and lower two-layer rotating in the rotor chamber of the lower casing and the rotor chamber of the upper casing, respectively. In the oil supply pump apparatus of the sewing machine for lubricating oil is sucked through each suction port of the upper and lower pumps, and discharged to each part of the sewing machine through the discharge port, at least one end of the lower casing is joined to the lower surface of the upper casing An open discharge groove is formed corresponding to the discharge port of the upper pump, while a lower oil supply passage is formed in the lower casing to communicate the pump chamber by the rotor downstream of the suction port and the rotor chamber of the upper casing. Part of the lubricant sucked through the suction port and discharged toward the discharge port is supplied to the rotor chamber of the upper casing through the oil passage. That is characterized.

According to the present invention, when the rotor shaft rotates in conjunction with the rotation of the main shaft, the upper and lower rotors of the upper and lower pumps arranged in succession rotates in the rotor chambers of the upper and lower casings respectively, and the lubricant is sucked through the respective suction ports. Discharge through the discharge port to each part of the sewing machine. That is, the lubricating oil is confined in the pump chamber formed by the rotating rotor to increase the pressure, and is discharged toward the discharge port. Here, in the lower pump, when the pump chamber by the rotating lower rotor reaches a position toward the oil feed passage, a part of the lubricating oil is supplied to the rotor chamber of the upper casing in the upper pump via the feed passage. The lubricating oil supplied to the rotor chamber of the upper casing of the upper pump enters into the gap formed between the rotor chamber of the upper casing and the upper rotor accommodated to allow rotation in the rotor chamber by the pressure, and enters into the suction port. Is filled.

As a result, at least one end is formed in the upper surface of the lower casing and is discharged between the upper chamber and the rotor chamber of the upper casing even if air tries to enter the suction port from the rotor chamber of the upper casing. The gap formed is sealed by the filled lubricating oil, can prevent air from invading the suction port through the gap, and can reliably prevent the deterioration of the suction performance of the upper pump.

The present invention, the rotor shaft is rotated in conjunction with the rotation of the sewing machine main shaft, the lower rotor and the upper rotor installed on the rotor shaft consists of a pump of the upper and lower two-layer rotating in the rotor chamber of the lower casing and the rotor chamber of the upper casing, respectively. In the oil supply pump apparatus of the sewing machine for lubricating oil is sucked through each suction port of the upper and lower pumps, and discharged to each part of the sewing machine through the discharge port, at least one end of the lower casing is joined to the lower surface of the upper casing The opened discharge groove is formed corresponding to the discharge port of the upper pump, while the upper casing is provided with a communication path penetrating to the upper surface from the rotor chamber downstream of the suction port, and part of the lubricant oil discharged to each part of the sewing machine. Is supplied to the rotor chamber of the upper casing through the communication path.

According to the present invention, when the rotor shaft rotates in conjunction with the rotation of the main shaft, the upper and lower rotors of the upper and lower pumps arranged in succession rotates in the rotor chambers of the upper and lower casings respectively, and the lubricant is sucked through the respective suction ports. Discharge through the discharge port to each part of the sewing machine. That is, the lubricating oil is confined in the pump chamber formed by the rotating rotor to increase the pressure, and is discharged toward the discharge port. At this time, a part of the lubricating oil supplied to each part of the sewing machine goes down to the oil feed pump device and enters the communication path formed in the upper casing of the upper pump. The lubricating oil which enters into the communication path enters the gap formed between the rotor chamber of the upper casing and the upper rotor accommodated to allow rotation in the rotor chamber by its own weight and is filled in the suction port.

As a result, at least one end is formed in the upper surface of the lower casing and is discharged between the upper chamber and the rotor chamber of the upper casing even if air tries to enter the suction port from the rotor chamber of the upper casing. The formed gap is sealed by the filled lubricating oil, can prevent air from entering the suction port through the gap, and can reliably prevent the deterioration of the suction performance of the upper pump.

According to the present invention, in the oil feed pump device composed of two layers of the lower pump and the upper pump, it is possible to reliably prevent air from entering the suction port of the upper pump and deteriorating the suction performance.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described based on drawing.

In FIG. 1 and FIG. 2, one Embodiment of the oil feed pump apparatus 1 of the sewing machine of this invention is shown.

In addition, the lower pump 2 and the upper pump 3 constituting the oil feed pump device 1 have a structure substantially the same as the lower pump 2 and the upper pump 3 described above, and the same reference numerals are used for the same members. The detailed description will be omitted, and different points will be described.

In the lower casing 21 of the lower pump 2 constituting the oil feed pump device 1, the inner rotor 5 and the outer rotor 4 which rotate in the rotor chamber downstream of the suction port 2a. The oil supply passage 2x which connects the pump chamber P formed by this and the rotor chamber downstream of the suction port 3a of the upper pump 3 is formed. The oil supply passage 2x has a smaller diameter than the hole diameter of the proximal end opening in the rotor chamber of the upper casing 31 of the upper pump 3 in the rotor chamber of the lower casing 21. It is.

Therefore, when the main shaft S is rotated by belt transmission through a sewing machine motor (not shown), the rotor shaft 6 rotates through the worm 8 and the worm wheel 7, and the lower casing of the lower pump 2 In the rotor chamber of the rotor chamber 21 and the rotor chamber of the upper casing 31 of the upper pump 3, the inner rotor 5 rotates, and the outer rotor 4 rotates in accordance with the rotation of the inner rotor 5, The lubricating oil is sucked by the negative pressure generated in these suction ports 2a and 3a, the sucked lubricating oil is shielded by the pump chamber P formed by the inner rotor 5 and the outer rotor 4, and the rotor shaft 6 Is discharged toward the discharge ports 2b and 3b on the downstream side in the rotational direction. At this time, when the pump chamber P formed by the rotating inner rotor 5 and the outer rotor 4 reaches the position toward the oil feed passage 2x, a part of the lubricant oil trapped in the pump chamber P and the pressure is high, It is narrowed at the small-diameter tip of the oil feed passage 2x, and the pressure becomes higher, and is supplied to the rotor chamber of the upper casing 31 in the upper pump 3 via the oil feed passage 2x. The lubricating oil supplied to the rotor chamber of the upper casing 31 of the upper pump 3 includes the rotor chamber of the upper casing 31 and the inner rotor 5 accommodated to allow rotation in the rotor chamber by the pressure. It enters into the gap formed between the outer rotor 4, and is filled in the suction port 3a. Accordingly, air is drawn from the gap between the rotor chamber of the upper casing 31 through the discharge groove 211 which is formed by opening both ends on the upper surface of the lower casing 21 and becomes the discharge port of the upper pump 3. Even if it is going to invade 3a), the clearance gap formed between the rotor chamber of the upper casing 31 and the inner rotor 5 and the outer rotor 4 accommodated in this rotor chamber is filled with lubricating oil, and air is sealed. Intrusion into the suction port 3a is prevented.

As a result, it is possible to reliably prevent air from entering the suction port 3a of the upper pump 3 and lowering the suction performance. The suction oil is always sucked and recovered, and the discharge groove 211 is discharged. You can blow it around.

In addition, in the lower pump 2, most of the lubricating oil trapped in the pump chamber P and the pressure is high is discharged to the oil supply pipe P1 through the discharge port 21b as described above, and is supplied to each part of the sewing machine and operated. After lubricating the part, the bottom part of the sewing machine frame F is recovered and used again for circulation.

Next, another embodiment of the oil feed pump device 1 of the sewing machine of the present invention will be described based on FIG. 3 and FIG. 4.

The lower pump 2 and the upper pump 3 constituting the oil feed pump device 1 of this embodiment are also given the same reference numerals to the same members as the lower pump 2 and the upper pump 3 described above. Descriptions will be omitted and different points will be described.

In the upper casing 31 of the upper pump 2 constituting the oil feed pump device 1, a communication path 3x penetrating from the rotor chamber downstream of the suction port 3a to the upper surface thereof is formed. This communication path 3x is formed with the larger diameter of the hole diameter of the upper end part opened to the upper surface of the upper casing 31 than the hole diameter of the lower end part opened to the rotor chamber.

Therefore, when the main shaft S is rotated by belt transmission through a sewing machine motor (not shown), the rotor shaft 6 rotates through the worm 8 and the worm wheel 7, and the lower casing of the lower pump 2 In the rotor chamber of 21 and the rotor chamber of the upper casing 31 of the upper pump 3, the inner rotor 5 rotates, respectively, and the outer rotor 4 rotates according to the rotation of the inner rotor, The lubricating oil is sucked by the negative pressure generated in the suction ports 2a and 3a, and the sucked lubricating oil is trapped in the pump chamber P formed by the inner rotor 5 and the outer rotor 4, and the rotor shaft 6 rotates. Discharge toward the downstream direction. Then, in the lower pump 2, the lubricating oil trapped in the pump chamber P and the pressure is increased is similarly discharged to the oil supply pipe P1 through the discharge port 21b, supplied to each part of the sewing machine to lubricate the movable part, The bottom part of the sewing machine frame F is recovered and used again for circulation. Similarly, in the upper pump 3, lubricating oil is sucked into the suction port 31a through the oil return pipe P5 and recovered, and is ejected from the openings at both ends of the discharge grooves 211 of the lower casing 2, which are discharge ports thereof. do.

In this way, the oil is discharged through the oil feed pipe P1, and the upper part of the sewing machine frame F is ejected to the circumference from a part of the lubricating oil ejected from the nozzle N or from the discharge groove 211 of the lower casing 2. A part of lubricating oil descends to the oil feed pump apparatus 1, enters the communication path 3x formed in the upper casing 31 of the upper pump 3, and is temporarily stored in the lower end part which consists of small diameters. The lubricating oil stored in the communication path 3x of the upper casing 31 of the upper pump 3 is, by its own weight, the rotor chamber of the upper casing 31 and the inner rotor 5 accommodated to allow rotation in the rotor chamber. ) And a gap formed between the outer rotor 4 and the outer rotor 4 are filled in the suction port 3a. Accordingly, air is drawn from the gap between the rotor chamber of the upper casing 31 through the discharge groove 211 which is formed by opening both ends on the upper surface of the lower casing 21 and becomes the discharge port of the upper pump 3. Even if it is going to invade 3a), the clearance gap formed between the rotor chamber of the upper casing 31 and the inner rotor 5 and the outer rotor 4 accommodated in this rotor chamber is filled with lubricating oil, and air is sealed. Intrusion into the suction port 3a is prevented.

As a result, it is possible to reliably prevent air from entering the suction port 3a of the upper pump 3 and deteriorating the suction performance, always sucking and recovering a set amount of lubricating oil, and through the discharge groove 211. You can blow it around.

Moreover, in the above-mentioned embodiment, although the case where the both ends were opened as the discharge groove formed corresponding to the discharge port of the upper pump on the upper surface of the lower casing of the lower pump was illustrated, only one end may be opened.

1 is a half sectional view showing a part of one embodiment of an oil feed pump device for a sewing machine according to the present invention.

FIG. 2 is a bottom view of the lower pump in the oil pump apparatus of FIG. 1. FIG.

Figure 3 is a half sectional view showing a part of another embodiment of the oil feed pump apparatus of the sewing machine according to the present invention.

Fig. 4 is a diagram showing an upper pump in the oil feed pump device of Fig. 3, (a) is a plan view, and (b) is a bottom view.

5 is a perspective view for explaining an oil pump of a sewing machine.

6 is a bottom view illustrating the operation of the oil pump apparatus of FIG. 5.

FIG. 7 is a plan view showing a part of the lower casing of the lower pump in the oil feed pump device of FIG. 5;

FIG. 8 is an explanatory diagram showing a schematic configuration of a main part of a sewing machine including the oil feed pump device of FIG. 5; FIG.

<Explanation of symbols for the main parts of the drawings>

1: oil feed pump device

2: lower pump

2x: refueling

21: lower casing

211: discharge groove

3: upper pump

3x: communication path

31: upper casing

4: external rotor

5: inner rotor

6: rotor shaft

7: worm wheel

8: worm

F: frame

S: spindle

Claims (2)

The rotor shaft rotates in conjunction with the rotation of the sewing machine spindle, and the lower and upper rotors installed on the rotor shaft are composed of two upper and lower pumps rotating in the rotor chamber of the lower casing and the rotor chamber of the upper casing, respectively. In an oil pump system for a sewing machine, each of which is sucked through each suction port of the upper and lower pumps, and discharged to each part of the sewing machine through a discharge port, the discharge groove having at least one end opened on the upper surface of the lower casing joined to the lower surface of the upper casing. While being formed corresponding to the discharge port of the upper pump, the lower casing is provided with an oil supply passage communicating with the pump chamber by the rotor downstream of the suction port and the rotor chamber of the upper casing, and through the suction port of the lower pump. A part of the lubricating oil sucked and discharged toward the discharge port is supplied to the rotor chamber of the upper casing through the oil supply passage. Oil feed pump device of a sewing machine which. The rotor shaft rotates in conjunction with the rotation of the sewing machine spindle, and the lower and upper rotors installed on the rotor shaft are composed of two upper and lower pumps rotating in the rotor chamber of the lower casing and the rotor chamber of the upper casing, respectively. In an oil pump system for a sewing machine, each of which is sucked through each suction port of the upper and lower pumps, and discharged to each part of the sewing machine through a discharge port, the discharge groove having at least one end opened on the upper surface of the lower casing joined to the lower surface of the upper casing. The upper casing is formed corresponding to the discharge port of the upper pump, while the upper casing is provided with a communication path penetrating upward from the rotor chamber downstream of the suction port, and a part of the lubricating oil discharged to each part of the sewing machine is connected to the communication path. Oil supply pump device of the sewing machine, characterized in that is supplied to the rotor chamber of the upper casing through.

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