JPH0131920B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for supplying lubricating oil to the hook of a cycle sewing machine such as a hole sewing machine.

Background Art For example, in a cycle sewing machine such as a buttonhole sewing machine, operation is performed for about 5 seconds, and then
The machine stops for 2 seconds, and these operations and stops are performed alternately to perform the sewing work. In such a buttonhole sewing machine, the amount of oil supplied to the hook per cycle is a very small amount, for example, about 2 to 3 mg, and it is generally difficult to accurately adjust the amount of oil.

By the way, the characteristics required for hook lubrication are (1) accurate and easy control of the appropriate oil amount according to the sewing conditions, and (2) ability to change the oil amount according to the sewing conditions. In some cases, a fast response speed is required. Here, the sewing conditions related to oil supply mainly refer to the number of revolutions. When the rotational speed is high, it is necessary to increase the amount of oil supplied, and therefore, it is necessary to accurately control the amount of oil according to the rotational speed. For example, if you want to increase the amount of oil but it is unstable or the response is slow, or if the oil supply is unstable and interrupted when making minute adjustments, problems such as the rotor burning out may occur. On the other hand, if the amount of oil is too large, the oil will adhere to the fabric to be sewn and cause it to sag. Therefore, the characteristics (1) and (2) above are generally required.

A first prior art technique for meeting the characteristics required in such kettle oiling is shown in FIGS. 5 and 6. An outer hook 2 of a full-rotation hook 1 installed in a buttonhole sewing machine or the like is rotatable, and an inner hook 3 is housed in the outer hook 2. A track groove 4 is formed on the inner peripheral surface of the outer hook 2, and a rail 5 formed on the outer circumferential surface of the inner hook 3 fits into the rail groove 4. An impregnating member 6 made of felt or the like is also housed in the outer hook 2 facing the opening of the track groove 4, and an oil supply passage 7 for supplying oil to the impregnating member 6 is located at the bottom of the outer hook 2. It is formed to extend radially outward. A rotating shaft 8 of the outer hook 2 is supported by bearings 9 and 10, and a lower shaft oil supply passage 11 extending in the axial direction is formed in the center of the rotating shaft 8. The seventh part of this lower shaft oil supply passage 11
The right end in the figure is open and communicates with the oil supply passage 7 via a space 12.

The bearing 9 has an oil supply port 1 from an oil supply pipe 13.
4, a room 15, and passages 16 and 17 are formed. An adjustment screw 18 is screwed into the chamber 15, and by operating this adjustment screw 18, the opening area of the passage 16 can be varied, and thereby the oil amount can be adjusted. It is structured as follows.

The lower shaft oil supply passage 11 also communicates with the passage 16.
A passage 32 communicating with the rotating shaft 8 is formed in the rotating shaft 8. When the sewing machine stops operating, passage 16 and passage 3 are
The outer hook 2 stops at the position where it communicates with the outer hook 2. At the same time as the sewing machine is stopped, the driving of the pump (not shown) is stopped, and thereby the oil supply from the pipe line 13 is stopped. The oil stored in the oil supply port 14 while the sewing machine is in operation is supplied to the lower shaft oil supply path 11 via passages 16 and 32 as soon as the sewing machine stops operating, and the remaining oil stored in the chamber 15 is removed. oil is in passage 1
7, 19, and is refueled by the pump.

In such prior art, oil seeped into the impregnated member 6 fitted radially outward from the opening of the raceway 4 is radially outward due to centrifugal force while the outer hook 2 is rotating. Since the oil is under pressure in the opposite direction, only the amount of oil supplied from the oil supply passage 7 that overflows from the impregnated member 6 is discharged to the rail groove 4. Therefore, if the sewing machine stops in such a state, the oil that has soaked into the impregnation member 6 remains as it is, and the oil supply passage 7 is cut off from the atmosphere at this point, and the oil supply passage 32 and the lower shaft oil supply Road 11,
The space between the oil supply passage 7 and the impregnation member 6 is in a sealed state. Therefore, from the passage 32 to the lower shaft oil supply passage 1
The amount of oil flowing into 1 tends to be unstable and difficult to enter.

Further, oil flowing into the lower shaft oil supply passage 11 from the passage 32 is transferred to the lower shaft oil supply passage 11 as shown by the imaginary line in FIG.
While clinging to the inner wall of the outer hook 2, the oil passes through the space 12 due to the action of centrifugal force, passes through the oil supply passage 7, soaks into the impregnation member 6, and is supplied to the raceway 4 of the outer hook 2.
At this time, the oil travels while clinging to the inner wall of the lower shaft oil supply passage 11, so the oil travels from the lower shaft oil supply passage 11 to the space 1.
2 to reach the oil supply passage 7 is unstable, and the response speed is not uniform, causing trouble in sewing work.

FIG. 7 is a cross-sectional view of the second prior art. Portions in this prior art that correspond to those in the prior art described above are given the same reference numerals. In this prior art, the bearing 10 is equipped with an oil amount adjusting means. That is, a passage 32a is formed in the lower shaft oil supply passage 11, and this passage 32a can communicate with the passage 20 formed in the bearing 10. This passage 2
0 communicates with room 21, and room 21 is connected to oil supply pipe 1
It communicates with one end of 3. An adjustment screw 22 is screwed into the chamber 21. This adjustment screw 22
By screwing forward and backward, the opening area of the passage 20 can be adjusted and the amount of oil can be made variable.

This prior art also has the same problems as the first prior art.

FIG. 8 is a cross-sectional view of the third prior art. Portions in this prior art that correspond to those in the prior art described above are given the same reference numerals. In this prior art, the oil stored in the tank 25 is stored in an oil wick such as a string.
6 and guided into the recess 28 of the metal fitting 27 fixed to the outer hook 2. As the outer hook 2 rotates in this state, oil in the recess 28 is supplied to the impregnating member 6 through the pipe 29 due to centrifugal force, and is discharged into the raceway 4 of the outer hook 2. Ru. Note that a lid 30 for receiving oil supplied from the pipe line 29 is provided to cover the rear (left side in FIG. 8) of the impregnation member 6. To adjust the oil amount, the oil wick 26 is pressed by operating the adjustment screw 31, thereby changing the cross section of the flow path and adjusting the oil amount.

In such prior art, the oil is guided into the recess 28 just before the outer hook 2 rotates, so the response of the oil is good, but the oil wick 26
Since the oil amount is adjusted by compressing the oil, the oil amount adjustment lacks accuracy and cannot be quantitatively adjusted. Further, there is a problem in that the amount of oil supplied is likely to decrease due to deterioration of the oil wick 26.

Problems to be Solved by the Invention In summary, in the prior art described above, it is possible to accurately and easily control the characteristics of lubricating the hook, that is, the appropriate amount of oil according to the sewing conditions, and the ability to control the appropriate amount of oil according to the sewing conditions. It does not satisfy the two characteristics of fast response speed when the amount is changed, and a refueling device having these two characteristics has been desired.

The purpose of the present invention is to solve the above-mentioned technical problems,
It is an object of the present invention to provide a lubricating oil supply device for a sewing machine in which fine adjustment and quantitative adjustment of oil amount can be accurately and easily performed, and the responsiveness of oil supply can be greatly improved.

Means for Solving the Problems The present invention provides a lubricating oil supply device for a sewing machine that has a horizontal rotation axis and has a predetermined rotation stop angle for the outer hook. A rail groove for supporting the inner hook is provided, a storage hole is provided in the peripheral wall and has an oil discharge port facing the rail groove; an oil supply passage that communicates with the storage hole and has an oil intake port at the other end, and the oil supply passage has an air hole at one end that slopes radially inward toward the inner pot. a position in which the oil intake port at the other end is eccentric from the rotation axis in a direction opposite to the direction in which the one end extends. A lower shaft oil supply passage is formed in the center of the rotary shaft of the outer hook, extending in the axial direction, open at one end, and communicating with the oil supply passage through the oil intake port. A fixed oil tank is provided, which communicates with the lower shaft oil supply path when the oil tank is stopped, the upper part of which communicates with the atmosphere, and whose liquid level is adjustable. A lubricating oil supply device for a sewing machine, characterized in that the lubricating oil supply device is located below the oil discharge port when the sewing machine is stopped.

According to the present invention, when the sewing machine is stopped, the oil supplied into the lower shaft oil supply passage of the oil tank is guided to the oil supply passage via the lower shaft oil supply passage of the outer hook rotating shaft, Therefore, as the outer hook rotates, it is immediately discharged into the raceway through the impregnating member. Therefore, the responsiveness of refueling can be significantly improved. Further, the amount of oil supplied per cycle is the value obtained by multiplying the cross-sectional area of the oil supply passage by the height of the vertical component of the adjustment hole with respect to the outer rotary hook rotation axis, so that constant oil supply per cycle can be achieved.

Embodiment FIG. 1 shows a full-rotation hook 4 with a horizontal rotation axis, which is provided in a cycle sewing machine according to an embodiment of the present invention.
0, FIG. 2 is a side view seen from the arrow A side in FIG. 1, and FIG. 3 is a side view seen from the arrow B side in FIG. Note that the bobbin and bobbin case 80 are not shown in FIG. 1.
An inner hook 42 is housed in an outer hook 41 that is rotatable around the rotation axis l1. A raceway groove 43 is formed on the inner circumferential surface of the outer hook 41, into which a rail 44 formed on the outer circumferential surface of the inner hook 42 is fitted. The outer hook 41 includes a mounting portion 41a, a bottom portion 41b, and a peripheral wall portion 4.
1c. The tip of the rotary shaft 45 is fitted into the mounting portion 41 a of the outer hook 41 and fixed with a set screw 46 . Peripheral wall portion 41 of outer hook 41
A horizontal storage hole 48 for storing an impregnated member 47 made of felt or the like is formed in c, and an oil discharge port 48a that opens facing the track groove 43 is formed in this storage hole 48. . An oil supply passage 49 is formed in the bottom portion 41b of the outer hook 41, and extends in the radial direction, and one end thereof communicates with the storage hole 48. In addition, an air hole 5 is provided in the bottom portion 41b of the outer hook 41 to communicate the oil supply passage 49 with the atmosphere.
0 is formed to be inclined radially inward from the oil supply passage 49 side toward the inner pot 42 side (right side in FIG. 1).

The rotating shaft 45 is supported by bearings 55 and 56. A lower shaft oil supply passage 57 extending in the axial direction is formed in the center of the rotary shaft 45, and one end (the right end in FIG. 1) of this lower shaft oil supply passage 57 is open and there is no space. It communicates with the oil supply passage 49 via 58. The oil intake port 49a, which is the radially inward end of the oil supply passage 49, faces the opening of the lower shaft oil supply passage 57 and extends from the rotational axis l1 of the outer hook 41 in the extending direction of the oil supply passage 49. are located eccentrically in the opposite direction.

A chamber 59 is formed in the bearing 56 and is open to the oil tank 62 side, which will be described later. In this room 59,
One end of the passage 60 extending in the radial direction of the bearing 56 is in communication with the passage 60, and the other end is open to the outer circumferential surface of the rotating shaft 45. A passage 61 that can communicate with the passage 60 is formed in the rotating shaft 45 . This passage 61
communicates with the lower shaft oil supply path 57. This passage 6
0 and the passage 61 communicate with each other when the sewing machine is stopped.

An oil tank 62 is arranged near the bearing 56. A center hole 6 is provided in the side wall of this oil tank 62.
3a is formed, and an annular recess 64 is formed in its outer peripheral surface. Right cylindrical part 63
An adjustment knob 65 is attached to the. This adjustment knob 65 has a cylindrical shaft portion 65a and a shaft portion 65a.
5a and a head 65b. The shaft portion 6
An annular recess 66 is formed in the inner circumferential surface of 5a, and an O-ring 67 is installed in the space defined by the annular recess 64 and the annular recess 66. Further, the head 65b has a chamber 68 that opens toward the center hole 63a.
An adjustment hole 69 is formed in this chamber 68, with one end opening and extending radially outward. Adjustment hole 69
The adjustment port 69a, which is the other end, faces the outer peripheral surface of the head 65b.

On the other hand, near the bottom of the side wall of the oil tank 62, a conduit 70 is formed, one end of which opens into the inner peripheral surface of the oil tank 62, and the other end of which opens into the chamber 59.
Oil is supplied to the oil tank 62 via a conduit 71 by a pump (not shown) that is driven when the sewing machine is in operation, and when the sewing machine is stopped, the supply of oil from the conduit 71 is also stopped.

The adjustment knob 65 is angularly displaceable around its axis, and by angularly displacing the adjustment knob 65, the vertical height of the adjustment port 69a changes and the oil liquid in the oil tank 62 changes. You can change the surface height. Therefore, by changing the level of oil in the oil tank 62, the amount of oil flowing into the oil supply passage 49 can be adjusted. In addition, in the state shown in Fig. 1, the adjustment knob 65 is
The amount of oil supplied is the minimum when turned 180 degrees.

Such a full-rotation hook 40 is installed in a cycle sewing machine such as a buttonhole sewing machine, and has an operation time of about 5 seconds and a stop time of about 1 to 2 seconds, and the operation and stop are alternately performed. repeated,
One buttonhole operation is completed during the run time.

Next, the full rotary rotary rotary hook 4 having the above configuration will be described.
The operation of 0 will be explained. When the boring work is completed and the rotation of the outer hook 41 is stopped, the drive of the pump for supplying oil is also stopped, and the passage 60 and the passage 61 are brought into communication. As shown in FIG. 4, which will be described later, during operation, oil is supplied into the oil tank 62 up to a liquid level r, and in the oil supply passage 49, there is an oil intake port 49a and an oil intake port 49a. Oil is filled only between the center position O and the center position O.

In this state, as described above, when the sewing machine is stopped, the passage 60 and the passage 61 are brought into communication with each other, and the oil in the oil tank 62 is supplied to the lower shaft of the rotary shaft 45 by the action of gravity. 57.
As a result, the oil in the oil supply passage 49 is pushed upward in the radial direction. At this time, the center position O in the oil supply passage 49 and the impregnated member 4 are connected by the air hole 50.
7 is in communication with the atmosphere, the oil in the oil supply passage 49 smoothly flows in the direction of arrow F. On the other hand, the oil level in the oil tank 62 and the adjustment hole 69 decreases, and when the oil levels in the oil supply passage 49 and the oil tank 62 reach the liquid level height r1, an equilibrium state is reached. , oil supply stops. Note that the level of the oil in the adjustment hole 69 changes depending on the level of the oil in the oil tank 62.

When the sewing machine is put into operation from the state shown in FIG. 4 1, the oil filled between the liquid level r1 and the center position O at the start of operation is drained from the outer hook, as shown in FIG. 4 2. The impregnating member 4 moves outward in the radial direction due to the centrifugal force caused by the rotation of the impregnating member 4.
7. Further, the oil flowing out from the air hole 50 moves toward the track groove 43 due to the action of centrifugal force caused by the rotation of the outer hook 41. Further, as the outer hook 41 rotates, the water flows out into the raceway 43 through the impregnation member 47 as indicated by reference numeral 81. On the other hand, while the outer hook 41 is rotating, the oil between the center position O and the oil intake port 49a flows in the oil supply direction F.
Because it receives centrifugal force in the opposite direction, the lower shaft oil supply path 5
7. The oil flowing from the space 58 and the oil intake port 49a to the center position O does not move at all, and this state is maintained until the sewing machine is stopped. Furthermore, the passage 60 and the passage 61 are connected to the outer rotor 4 after the start of operation.
Therefore, the oil in the oil tank 62 can flow from the passage 60 to the passage 61, but since the outer hook 41 rotates at 5000 to 8000 rpm, this inflow amount is is extremely small, and moreover, the oil intake port 49a relative to the rotational axis l1 mentioned above is
The centrifugal force due to the positional relationship between the two can be ignored because it acts to prevent the inflow of oil.

Incidentally, at the same time as the sewing machine starts operating, an oil supply pump (not shown) is driven and oil is supplied to the oil tank 62, thereby raising the oil level in the oil tank 62 and the adjustment hole 69, and causing the oil level to rise. It returns to the liquid level height r. Thereafter, the supplied excess oil is discharged from the adjustment port 69a, as shown in FIG. 4, which will be described later. In this way, the oil in the oil tank 62 is
The liquid level is maintained at the same level as 9a.

In this way, all the oil in the oil supply passage 49 is removed from the raceway 43.
When the oil is released into the oil supply passage 49, the oil in the oil supply passage 49 is in the state shown in FIG. 4, and the supply of oil to the raceway 43 is stopped. At this time, no oil is present in the range from the center position O of the oil supply passage 49 to the impregnation member 47. Also, the impregnation member 47
The impregnated member 47 remains impregnated with oil because it is pushed radially outward by centrifugal force.

Thereafter, this oil condition is maintained until the outer hook 41 is stopped. Note that since this is a cycle sewing machine whose operating time is approximately 5 seconds per process, if oil is supplied to the track groove 43 at the beginning of cycle operation, the outer hook 41 will not seize. When the operation period of the sewing machine has elapsed and the operation of the sewing machine is stopped, the passage 61 is aligned with the passage 60 again as shown in FIG. 4, and the drive of the oil supply pump is stopped. Similarly, oil starts flowing into the oil supply passage 49.

In this way, when the outer hook 41 is stopped, oil is supplied in the oil supply passage 49 up to the liquid level height r1, and therefore, immediately after the outer hook 41 rotates, the oil is supplied to the raceway 43.
The outer rotor 41 is extremely responsive.
is prevented from burning out. Further, the amount of oil supplied per cycle is a value obtained by multiplying the cross-sectional area S of the oil supply passage 49 by the height of the vertical component of the adjustment hole 69 with respect to the rotation axis l1, so that constant oil supply per cycle can be achieved.

In the case of a cycle sewing machine, when the sewing machine stops, the thread take-up always stops near the top dead center due to the sewing process. The outer hook 41 rotates in synchronization with the balance, so the outer hook 41 also stops at a determined phase. Therefore, in the embodiment described above, the oil supply passage 49
is made to extend along the vertical line l2 (see Figure 3) passing through the center position O, but the vertical line l2
and the extending direction of the oil supply passage 49 (the third
(see figure) may be set up to approximately ±80°.

Although the impregnating member 47 is provided in the above-mentioned embodiment, a structure in which the impregnating member 47 is not provided may also be used.

Further, in the above-mentioned embodiments, a cycle sewing machine hook lubricating device has been described, but the present invention can be widely applied to other sewing machine hook lubricating devices.

Effects As described above, according to the present invention, the amount of oil supplied into the oil supply passage, that is, the amount of oil supplied to the hook can be controlled by changing the liquid level height of the oil tank according to the sewing conditions. Can be adjusted. Further, the amount of oil supplied per cycle is a value obtained by multiplying the cross-sectional area of the oil supply passage by the height of the vertical component of the adjustment hole with respect to the axis of rotation, so that constant oil supply per cycle can be achieved. Furthermore, since oil flows into the oil supply passage when the outer hook is stopped, the response speed of oil supply can be improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of one embodiment of the present invention, FIG. 2 is a side view seen from the arrow A side in FIG. 1, and FIG.
FIG. 4 is a diagram for explaining the oil supply operation, FIG. 5 is a sectional view of the first prior art, and FIG. 6 is a side view seen from the arrow B side in the figure. A side view seen from the B side, FIG. 7 is a sectional view of the second prior art, and FIG.
The figure is a cross-sectional view of the third prior art. 41...Outer hook, 42...Inner hook, 43...Rail groove, 4
4... Rail, 45... Rotating shaft, 47... Impregnation member, 48
...Storage port, 48a...Oil discharge port, 49...Oil supply passage, 49a...Oil intake port, 50...Air hole, 55,
56... Bearing, 57... Lower shaft oil supply path, 60, 61... Passage, 62... Oil tank, 65... Adjustment knob, 69...
Adjustment hole, 69a...Adjustment port.

Claims (1)

[Claims] 1. In a lubricating oil supply device for a sewing machine that has a horizontal rotation axis and a rotation stop angle of the outer hook is determined, the outer hook has an inner hook provided on the inner peripheral surface of the peripheral wall. A rail groove for supporting the rotary hook, a storage hole provided in the peripheral wall and having an oil discharge port facing the rail groove, and a storage hole extending in the radial direction at the bottom and communicating with the storage hole at one end. , and an oil supply passage whose other end serves as an oil intake port, and the one end of the oil supply passage is connected to the atmosphere by an air hole that slopes radially inward toward the inner pot. communicated with each other and extends upward from the rotational axis of the outer hook when the outer hook is stopped, and the oil intake port at the other end is located at a position eccentric from the rotational axis in a direction opposite to the direction in which the one end extends; A lower shaft oil supply passage is formed in the center of the rotary shaft of the rotary hook, which extends in the axial direction, is open at one end, and communicates with the oil supply passage through the oil intake port. A fixed oil tank is provided, which communicates with the lower shaft oil supply path, the upper part of which communicates with the atmosphere, and whose liquid level can be adjusted. A lubricating oil supply device for a sewing machine, characterized in that the lubricating oil supply device is located below the oil discharge port.