JPH0610955Y2 - Forced lubrication type overlock sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The purpose of the present invention is a forced lubrication type overlock sewing machine.

Generally, industrial sewing machines have a structure in which the arm and bed of the sewing machine are hermetically sealed, and an oil sump and oil supply pump are provided below the bed, and the pump forcibly circulates lubricating oil in the rotating and sliding parts of the sewing machine. , To prevent heat generation and wear. Regarding the needle bar drive mechanism, in order to facilitate adjustment of the vertical movement position, the connecting portion between the needle bar and the crank shaft is open, but as the speed of the sewing machine has increased, it has been decided that it will be used. Issue, Jitsugan Sho 62-13
As can be seen from No. 582, the entire drive portion of the needle bar movement mechanism also has a closed structure to prevent oil leakage of lubricating oil.

However, in a sewing machine having such a needle bar movement mechanism, when changing or adjusting the vertical movement position of the needle bar, it is necessary to remove the cover of the closed chamber used for maintaining the tightness, and Since this cover is usually attached to the arm by a plurality of screws via a seal member, there is a problem that it takes time to attach and detach the cover. Further, even in the case of the closed structure, the oil is scattered from the needle bar bearing portion, so that it is necessary to suppress it as much as possible. Therefore, a first object of the present invention is to provide a forced lubrication type overlock sewing machine which has a simple oil supply mechanism and does not leak oil even at high speed rotation, and a second object thereof is a vertical movement position of a needle bar. Is easy to adjust,
The third problem is to reliably prevent the oil from scattering.

Structure of the Invention That is, this invention comprises a forced oiling type overlock sewing machine in which an arm is provided as two sealed chambers and oil leakage is prevented when a lubricating oil is circulated in each sealed chamber by a pump. The sewing machine of the invention according to the paragraph 1 divides the arm of the sewing machine into a first closed chamber that communicates with a bed having an oil reservoir and a second closed chamber that houses the needle bar base, and at the top of the first closed chamber. A crank arm that horizontally rotatably supports a crank arm that penetrates into the second closed chamber and that is connected to a needle swing rod that swings in conjunction with the main shaft in the first closed chamber and that is axially attached to the crank shaft with a screw. , A lubricating oil circulation pump and piping are provided, and a needle swing crank for connecting the crankshaft and the needle bar and an oil discharge port are provided in the second closed chamber, and at least a forced oil supply is provided in the first closed chamber. To do A hole for inserting a wrench and a plug fitted into the hole are provided above the crank arm shaft attachment portion of the first closed chamber, and the first aspect of the invention according to the second aspect. According to the third aspect of the present invention, there is provided a forced lubrication type sewing machine in which the arm of the sewing machine is provided with an oil reservoir. A first closed chamber communicating with the first closed chamber and a second closed chamber containing the needle bar base, and a crankshaft horizontally supported on the upper part of the first closed chamber penetrates into the second closed chamber. In the first closed chamber, a crank arm that is connected to a needle swing rod that swings in conjunction with the main shaft and is pivotally attached to the crank shaft with a screw, a pump for circulating lubricating oil, and a pipe are provided. In the closed chamber, there is a needle swing crank that connects the crank shaft and the needle bar. A bar bearing and an oil drain port are provided so that forced oil supply is performed at least in the first closed chamber, and an oil drain pipe is opened near the lower end of the needle bar bearing in the second closed chamber, and the oil contained in the drain pipe is opened. The core is arranged so as to come into contact with the bearing or the needle bar that moves downward and protrudes downward from the bearing, and the pump is a trochoid pump having two suction ports, and one of the suction ports is opened in the oil sump. At the same time, the other suction port is connected to the oil drain pipe.

Action As described above, in the device of the first aspect, the wrench insertion hole and the plug are provided above the shaft attachment portion of the crank arm. Therefore, when adjusting the vertical movement position of the needle bar, the plug is removed and the wrench is removed. Since it is possible to fit the screw of the shaft attachment part, it is possible to save the labor of removing the cover of the first closed chamber, etc. Also, in the device according to the second aspect, the lubrication status for the crankshaft can be confirmed through the transparent window. . Further, in the device according to the third claim, 1
It is possible to prevent the oil from splashing from the needle bar bearing by using one trochoid pump.

Embodiment The present invention will be described with reference to FIGS. 1 to 5 showing an embodiment thereof. In FIG. 1 and FIG. 2, an essential part of an overlock sewing machine according to the present invention is shown in section, and an arm. 1 is divided into a first closed chamber 3 continuous with the bed 2 and a second closed chamber 5 for accommodating the base of the needle bar 4. Then, the inside of the first closed chamber 3 is integrally formed so as to communicate with the bed 2, and an arm cover 6 is fixed to the upper part thereof and an oil sump 7 is fixed to the lower part thereof with screws through packings 8 to form a closed structure. ing. A trochoid pump 9 is installed in the oil sump 7 and is driven by the main shaft 10 to feed the oil supply pipe 1
Lubricating oil is circulated to each part of the sewing machine through 1, 12, the oil drain pipe 13, the filter 14, and the like. As shown in FIG. 3, the trochoid pump 9 includes a suction port 15 connected to the oil drain pipe 13 and a rectangular suction port 16 having a larger size than the suction port 15. The suction port 16 is opened in the oil sump 7, The rotation of the main shaft 10 causes the first and second rotors 1 to
By rotating 7 and 18, about 1/3 of the first half of the working angle is used for suction from the oil discharge pipe 13 with a small amount of oil, and the remaining 2/3 is used for suction of oil in the oil sump 7, and the suction port 15, These drained oils sucked sequentially from 16 are passed through the oil supply pipe 11 to the filter 1
It is designed to discharge toward No. 4. Then, the lubricating oil purified by the filter 14 is supplied to each part of the sewing machine through the oil supply pipe 12.

Although not shown in the drawing, the bed 2 below the first closed chamber 3 is provided with a cloth feed mechanism and a drive portion of a looper mechanism that are interlocked with the main shaft 10 of the sewing machine, and the main shaft 10 is eccentric. The upper end of the needle swing rod 19 which is swung by the cam extends into the arm 1. A crankshaft 22 is horizontally supported by bearings 20 and 21 in the arm 1, that is, in the upper part of the first closed chamber 3, and a crank having a fork fixed to the crankshaft 22 with a screw 23 as shown in FIG. The arm 24 is connected to the upper end of the needle swing rod 19 by the pin 25, and the rotation of the main shaft 10 is converted into the swing of the crankshaft 22. Further, the crankshaft 22 penetrates the bearing portion 20 into the second closed chamber 5 to drive the needle bar 4. That is, in the second closed chamber 5, as shown in FIG.
As shown in FIG. 5, a needle swing crank 27 having a bifurcated portion 26 is fixed to the crankshaft 22 with a screw 28, and the bifurcated portion 26 has a cylindrical shape at both ends and a parallel plane formed in the middle portion. The pin 29 is rotatably held. On the other hand, the needle bar 4 is provided with a guide member 31 having a U-shaped parallel guide groove 30 at the upper end, and the bearing 3 is provided below the second closed chamber 5.
2 and penetrate it and fix it with a screw 33.
And the parallel pin 29 is fitted in the parallel guide groove 30 at the upper end of the needle bar so that the crank bar 22 swings to move the needle bar 4 up and down. In FIG. 4, 34 is a bush, 35 is an oil hole, and 36 is the crankshaft 2.
2 is a collar for preventing sliding, 37 is a screw for fixing the pin 25 to the needle swing rod 19, 38 is an O-ring, 39 is a needle clamp, 40 is a needle, 41 is a needle clamp guide, 42 is a female screw,
43 is an oil-immersed felt, and the needle bar 4 is coated with titanium to improve heat resistance and hardness. Further, as shown in FIG. 3, an oil drain hole 44 is provided at the bottom of the second closed chamber 5, and an opening 46 closed at the top by a plug 45 is provided at the top of the second closed chamber 5, and oil is introduced from the first closed chamber 3. Tube 47
Is opened in the vicinity of the needle bar 4, and an oil drain pipe 49 through which an oil core 48 is inserted is provided below the closed chamber 5 so that the tip of the oil core 48 is located below the needle bar bearing 32 protruding from the closed chamber 5. The oil drain pipes 49 are brought into contact with each other and are connected to the oil drain pipes 13 in the first closed chamber 3. In addition, the oil supply pipe 47 receives the oil scattered in the first closed chamber 3 in accordance with the rotation of the crankshaft 22 in the form of a gutter, and causes the oil to naturally flow down into the second closed chamber 5 to be guided to the needle bar 4. There is an oil core inside the pipe. Also, as shown in FIG.
The opening 50 of the oil supply pipe 12 is exposed above the bearings of the crankshaft 22 and the crank arm 24 of the closed chamber 3 of the above, and a hole 51 is provided in the arm cover 6 above the opening 50 and the hole 51 is transparent. An acrylic resin stopper 53 having a window 52 is fitted and hermetically sealed. This hole 51 has a diameter of about 20 mm and can be used as an oiling port when the plug 53 is removed. Moreover, since the shaft mounting portion of the crank arm 24 is located below the hole 51, a wrench suitable for the screw 23 is used. If it is inserted from 51, the needle bar movement position can be easily adjusted, and it is not necessary to remove the arm cover 6. Also, the stopper 53
Even when is closed, the opening 50 of the oil supply pipe 12 can be seen through the transparent window 52, and the state of oil supply to the crankshaft 22 during the sewing machine movement can be confirmed.

As described above, according to the present invention, the arm is provided with two closed chambers to prevent oil leakage, and in the first aspect of the invention, the hole is provided above the crank arm shaft attachment portion, which is simple. With such a structure, the operability of work at the time of lubrication and adjustment of the needle bar movement position can be improved, and in the second aspect of the invention, the hole can be used as a window for confirming lubrication. Further, in the device of the third aspect, since the trochoid pump is used, the pump is compact, and the two suction ports are provided in the pump. Therefore, the oil in the oil sump and the oil from the drain pipe can be collected by one pump. Oil can be sucked and oil can be supplied to the filter, etc., and lubricating oil can be circulated with a simple structure to prevent oil leakage and oil scattering.

[Brief description of drawings]

The drawings show an embodiment of the present invention, FIG. 1 is a front view showing a cross section of a main portion of an overlock sewing machine, FIG. 2 is a cross sectional view seen from the side, FIG. 3 is a bottom view of a pump portion, and FIG. Four
FIG. 5 is an exploded perspective view of the needle bar drive unit, and FIG. 5 is a side view showing a cross section of the second closed chamber. 1: Arm, 3: First closed chamber, 4: Needle bar 5: Second closed chamber, 7: Oil sump 9: Trochoid pump, 11, 12, 47: Oil supply pipe 13,48: Oil discharge pipe, 15, 16: Suction port 19: Needle swing rod, 22: Crank shaft 23: Screw, 24: Crank arm 27: Needle swing crank, 44: Oil drain port, 51: Hole 52: Window, 53 ... Plug

Claims (3)

[Scope of utility model registration request] 1. An arm of a sewing machine is divided into a first closed chamber that communicates with a bed provided with an oil sump and a second closed chamber that houses a needle bar base, and is horizontally placed above the first closed chamber. The first crankshaft is pierced into the second closed chamber,
In the closed chamber of No. 2, a crank arm that is connected to a needle swing rod that swings in conjunction with the main shaft and is screwed to the crankshaft, a pump for circulating lubricating oil and piping, and a second closed chamber are provided. Is provided with a needle swing crank that connects the crank shaft and the needle bar and an oil drain port so that forced oil supply is performed at least in the first closed chamber, and a wrench is provided above the crank arm shaft attachment portion of the first closed chamber. A forced lubrication type overlock sewing machine having a hole for insertion and a plug fitted in the hole. 2. The forced lubrication type overlock sewing machine according to claim 1, wherein the pipe is opened below the stopper, and the stopper is provided with a transparent window. 3. An arm of the sewing machine is divided into a first closed chamber which communicates with a bed provided with an oil sump and a second closed chamber which houses a needle bar base, and is horizontally arranged above the first closed chamber. The first crankshaft is pierced into the second closed chamber,
In the closed chamber of the second closed chamber, a crank arm that is connected to a needle swing rod that swings in conjunction with the main shaft and is screwed to the crank shaft, a pump for circulating lubricating oil, and a pipe are provided. Is provided with a needle swing crank that connects the crank shaft and the needle bar, a needle bar bearing, and an oil drain port so that forced oil supply is performed at least in the first closed chamber, and the lower end of the needle bar bearing in the second closed chamber is provided. The oil drain pipe is opened in the vicinity, and the oil core housed in the oil drain pipe is arranged so as to contact the bearing or the needle bar that moves downward and upward, and further the pump has two suction ports. As a trochoid pump, a forced oil supply type overlock sewing machine in which one suction port is opened in the oil sump and the other suction port is connected to the oil discharge pipe.