JPS643514B2 - - 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 sewing operation is stopped for 2 seconds, and these movement stops are performed alternately to complete the sewing operation. In such a buttonhole sewing machine, the amount of oil supplied to the hook per cycle is, for example, about 2 mg.

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 if this cannot be controlled accurately, problems may occur, such as the oil being unstable even though you want to increase the amount of oil, or the rotor burning if the response is slow. On the other hand, if the amount of oil is too large, the oil will adhere to the fabric to be sewn and cause yellowing. Therefore, the characteristics (1) and (2) above are generally required.

A first prior art technique for meeting the required characteristics in refueling such a pot is shown in FIGS. 7 and 8. 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 circumferential surface of the outer hook 2, and a rail 5 formed on the outer circumferential surface of the inner hook 3 is fitted 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 an oil storage space 11 extending in the axial direction is formed in the center of the rotating shaft 8. The seventh oil storage space 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.

Further, the oil storage space 11 is connected to 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 during the operation of the sewing machine is supplied to the oil storage space 11 via the passages 16 and 32 at the same time 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 that has permeated into the impregnated member 6 fitted radially outward from the opening of the raceway 4 is radially dispersed by centrifugal force while the outer hook 2 is rotating. Since pressure is applied outward in the direction, only the amount of oil supplied from the oil supply passage 7 that overflows from the impregnated member 6 is discharged to the track 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 oil storage space 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 oil storage space 1
The amount of oil flowing into 1 tends to be unstable and difficult to enter.

Also, while the outer hook 2 is rotating, that is, the sewing machine is operating, the oil that has flowed into the oil storage space 11 from the passage 32 flows into the oil storage space 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, since the oil moves while clinging to the inner wall of the oil storage space 11, the time from the oil storage space 11 to the oil supply passage 7 via the space 12 is unstable, the response speed is uneven, and sewing work is hindered. Come.

FIG. 9 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 oil storage space 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. 10 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 sucked up through an oil wick 26 such as a string and guided into a recess 28 of a 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. 10) 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 significantly improved.

Means for Solving the Problems In the present invention, the inner hook is housed in the outer hook such that the rail formed on the outer circumferential surface of the inner hook fits into the rail groove formed on the inner circumferential surface of the rotatable outer hook. an oil storage space having an opening facing the outer hook is formed in the rotating shaft of the outer hook, the outer hook has an oil discharge port facing the track groove, and a storage space for storing the first impregnating member. a hole, and an oil supply passage having an oil intake whose other end faces the opening of the oil storage space, and which extends in a radial direction from the oil intake and communicates with the storage hole, the oil supply passage This lubricating oil supply device for a sewing machine is characterized in that an air hole opening to the atmosphere is formed in the middle of the oil supply passage, and a second impregnated member is filled in a position of the oil supply passage where the air hole communicates with the oil supply passage.

In a preferred embodiment, the oil intake port is located eccentrically from the rotational axis of the outer hook in a direction opposite to the direction in which the oil supply passage extends.

Effect According to the present invention, the oil supplied when the sewing machine is stopped is guided from the oil storage space to the second impregnation member through the oil intake port of the oil supply passage, and the air hole is blocked by the second impregnation member. When this happens, the supply of oil from the outside stops. As the outer hook rotates in this state, centrifugal force acts on the oil that has been filled between the oil intake port of the oil supply passage and the second impregnation member, causing it to flow through the oil supply passage. It flows radially outward, permeates the first impregnating member, and is discharged into the raceway of the outer hook. Therefore, by setting the distance from the rotary shaft of the outer hook to the second impregnation member and the air hole in advance in accordance with the amount of oil to be supplied, it is possible to always supply a fixed amount of oil. . In addition, since the oil travels halfway through the oil supply passage, when the outer hook rotates, it is immediately discharged into the outer hook raceway through the first impregnated member, resulting in extremely good responsiveness.

Embodiment FIG. 1 is a sectional view of a full-rotation hook 40 provided in a cycle sewing machine according to an embodiment of the present invention.
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 in FIG. 1, the bobbin and bobbin case are omitted. Rotatable outer hook 4
1 houses an inner pot 42. A raceway groove 43 is formed on the inner peripheral surface of the outer hook 41, and the inner hook 42
A rail 44 formed on the outer circumferential surface of the rail 44 is fitted.
The outer hook 41 has a mounting portion 41a, a bottom portion 41b, and a peripheral wall portion 41c. Attachment part 41a of outer hook 41
The tip of the rotating shaft 45 is fitted into the holder and fixed by a set screw 46. Peripheral wall portion 4 of outer hook 41
1c includes a first impregnated member 4 made of felt or the like.
A storage hole 48 is formed in which 7 is stored, and an oil discharge port 48a that opens facing the rail 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 radially outward and communicates with the storage hole 48. A mounting hole 50 is formed on the rear side of the bottom portion 41b of the outer hook 41, a plug 51 is fitted into the mounting hole 50, and an air hole 52 is formed in the plug 51. A second impregnated member 53 made of felt or the like is filled in the space defined by the plug body 51 and the oil supply passage 49.

The rotating shaft 45 is supported by bearings 55 and 56. An oil storage space 57 extending in the axial direction is formed in the center of the rotating shaft 45. One end (the right end in FIG. 1) of this oil storage space 57 is open, and the space 58 is opened. It communicates with the oil supply passage 49 via the oil supply passage 49 . The oil intake port 49a, which is the radially inner end of the oil supply passage 49, is formed facing the opening of the oil storage space 57. In other words, the oil intake port 49a is arranged at a position eccentric from the rotation axis l1 of the outer hook 41 in a direction opposite to the direction in which the oil supply passage 49 extends.

An oil tank 5 is provided on the outer peripheral surface and top of the bearing 56.
9 are erected. Oil is supplied to this oil tank 59 via an oil supply pipe 60 from a pump (not shown). A through hole 59 is provided at the bottom of the oil tank 59.
a is formed, and a bearing 56 is inserted into this through hole 59a.
One end of a passage 61 extending in the radial direction is in communication, and the other end of the passage 61 is open to the outer circumferential surface of the rotating shaft 45. A passage 62 that can communicate with the passage 61 is formed in the rotating shaft 45 . This passage 6
2 communicates with the oil storage space 57. The passage 62 and the passage 61 communicate with each other when the sewing machine is stopped,
As a result, the oil in the oil tank 59 is removed from the oil storage space 5.
It can lead to within 7.

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

Next, a full-rotation hook 40 having such a configuration will be described.
The operation will be explained. When the drilling work is completed and the rotation of the outer hook 41 is stopped, the driving of the pump for supplying oil is also stopped. Note that during operation, the oil tank 59 is filled with oil. When the sewing machine is stopped, the passage 61 and the passage 62 are brought into communication with each other, so that the oil tank 5
The oil stored in the oil supply passage 49 is pushed out radially outward from the oil intake port 49a of the oil supply passage 49 by its gravity, and the oil stored in the oil supply passage 49 is pushed out radially outward from the oil intake port 49a of the oil supply passage 49, as shown in FIG.
The oil permeates into the impregnated member 53.

Here, the height of the oil level in the oil tank 59 from the rotational axis l1 of the outer hook 41 is defined as H1, and the rotational axis l1
The height from the air hole 52 to the air hole 52 is H2, and the rail groove 43 formed in the storage hole 48 from the rotation axis l1
The height to the oil discharge port 48a is defined as H3.

Oil is pushed radially outward in the oil supply passage 49 from the oil intake port 49a, and is supplied to the second impregnating member 53 as shown in FIG. When the oil supply passage 49 reaches a pressure-blocked state, the oil tank 5
The inflow of oil from 9 is stopped.

If the sewing machine is left in a stopped state for a long time, the oil seeping out from the second impregnation member 53 will be discharged to the outside of the hook through the air hole 52,
When the height H1 of the oil level drops to the height H2 up to the air hole 52, the discharge stops. If the position of the air hole 52 is vertically downward with respect to the rotation axis l1 when the sewing machine is stopped, not only the oil in the oil tank 59 but also the oil inlet 4 in the oil storage space 57
The amount of air vertically above 9a is discharged from the air hole 52 to the outside of the hook. In this case, until the oil storage space 57 is filled with oil at the start of the next operation,
Oil supply to the track groove 43 will stop. However, 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 rotary hook rotates in synchronization with the take-up pin, so the outer rotor 41 also stops at a fixed phase. Therefore, the air hole 52 is set in advance so that it always has a radius larger than the diameter of the rotating shaft 45 and is located vertically upward.

When the sewing machine is put into operation from the state shown in FIG. 41, the oil filled between the second impregnating member 53 and the intake port 49a, as shown in FIG. It is moved radially outward by the centrifugal force caused by the rotation of the outer hook 41,
It soaks into the first impregnation member 47. Furthermore, as the outer hook 41 rotates, the oil in the passage 49 is pushed outward in the radial direction by the centrifugal force caused by the rotation of the outer hook 41, as shown in FIG. 1 through the impregnation member 47 into the track groove 43 as indicated by reference numeral 63. At this time, the second
No oil has penetrated into the impregnated member 53, so the oil supply passage 49 is in communication with the atmosphere through the air hole 52, and oil is not allowed to flow from the oil intake port 49a to the oil supply passage 49. It is now ready for inflow. However, while the outer hook 41 is rotating, the oil in the oil storage space 57 is provided eccentrically from the rotation axis l1 in the opposite direction to the extending direction of the oil supply passage 49, so that oil is supplied from the oil intake port 49a. Oil does not flow into the passage 49, and the filled state is maintained as long as oil does not flow into the oil storage space 57 from the passage 62.
The oil flowing into the oil storage space 57 is immediately
It is maintained in a state where it can flow out into the impregnating member 47. Note that the passage 61 and the passage 62 coincide with each other once every rotation of the outer rotor after the start of operation, so oil in the oil tank 59 can flow from the passage 61 to the passage 62, but the outer rotor 41 is from 5000
Since it rotates at 8000 rpm, this amount of inflow is extremely small, and furthermore, the centrifugal force acts to prevent the inflow of oil due to the positional relationship of the oil intake port 49a with respect to the rotational axis l1, so it can be ignored.

Further, while the kettle is in operation, an oil supply pump (not shown) is driven, so that oil is supplied into the oil tank 59 via the pipe line 60. However, as mentioned above, the oil in the oil storage space 57 is
Since the kettle does not move at all during operation and remains in a constant state, even if oil is supplied from the pipe 60, it does not advance any further, and therefore the oil tank 59
Oil overflows from the surface. This overflowing oil is collected and refluxed by a pump (not shown). In this way, oil is immediately supplied into the oil supply passage 49 after the outer hook 41 stops, and oil is supplied to the raceway 43 immediately after rotation, so that the outer hook 41 is prevented from burning out with excellent responsiveness. In addition, the amount of oil supplied is determined at a height H from the rotation axis l1 in the supply passage.
This is the amount filled up to 2, and it is possible to always supply a fixed amount.

When all the oil in the oil supply passage 49 is released into the track groove 43, the oil in the oil supply passage 49 is reduced to the level shown in FIG.
The state shown in is reached, and the supply of oil to the rail groove 43 is stopped. At this time, no oil is present in the entire range of the oil supply passage 49. Thereafter, these states are maintained until the outer hook 41 stops.
In addition, since this is a cycle sewing machine whose operation time is approximately 5 seconds per process, the track groove 43 is closed at the beginning of cycle operation.
If oil is supplied to the outer hook 41, the outer hook 41 will not burn out. In this way, the operating period of the sewing machine has passed,
When the sewing machine stops operating, please refer to Fig. 4 1 again.
As shown, the passage 62 coincides with the passage 61, the driving of the oil supply pump is stopped, and oil starts flowing into the oil supply passage 49 in the same manner as described above.

In this way, the oil supply operation is performed in conjunction with the operation and stop of the outer hook 41, and a fixed amount of oil can be supplied to the raceway 43.

FIG. 5 is a sectional view of an oil supply device according to another embodiment, and FIG. 6 is a side view of the oil supply device as viewed from the side indicated by arrow C in FIG. In addition, in the part corresponding to the above-mentioned example,
The same references are given. A disk-shaped swinging member 70 is attached to the bottom portion 41b of the outer hook 41. The oil supply passage 49 is constituted by the inner surface of the swinging member 70 and the groove 71 formed on the outer surface of the bottom portion 41b. As shown in FIG. 6A, the swinging member 70 has a disc-shaped base 70a and a right cylindrical cylindrical part 70b erected on the base 70a. Cylinder part 7
An air hole 52 is formed in the cylindrical portion 70b.
fits into the groove 71. Note that the second impregnation member 53 is filled into the air hole 52. The swinging member 70 is supported by the step surface 41a1 of the attachment portion 41a of the outer hook 41 and the fixed member 72 at its peripheral edge. The fixing member 72 has fixing screws 7
3 are screwed together, and by screwing this fixing screw 73, the swinging member 70 is fixed.

To adjust the oil amount, loosen screw 73,
The swinging member 70 is rotated to move the cylindrical portion 70b along the groove 71 in the radial direction. As a result, the positions of the air holes 52 and the second impregnated member 53 move in the radial direction, so the amount of oil stored between the oil intake port 49a and the second impregnated member 53 in the oil supply passage 49 changes. With this, the amount of oil supplied when the outer hook 41 is rotated can be adjusted.
In this way, in this embodiment, it is possible to adjust the oil amount in stages.

Although the above-mentioned embodiment describes a hook oiling device for a cycle sewing machine, the present invention can be widely implemented in other sewing machine hook oiling devices.

Effects As described above, according to the present invention, the oil stored between the oil intake port of the oil supply passage and the second impregnated member is discharged into the raceway through the first impregnated member when the outer hook rotates. Therefore, a constant amount of oil can be supplied at all times, and 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 another embodiment of the present invention, and FIG. 6 is a side view of FIG. A side view seen from the arrow C side, FIG. 6A is a perspective view of the swinging member 70,
FIG. 7 is a sectional view of the first prior art, and FIG. 8 is a cross-sectional view of the first prior art.
FIG. 9 is a sectional view of the second prior art, and FIG. 10 is a sectional view of the third prior art. 41... Outer hook, 42... Inner hook, 43... Rail groove, 44... Rail, 45... Rotating shaft, 47... First impregnation member, 48... Storage port, 48a... Oil discharge port, 49...Oil supply passage, 49a...Intake port,
52...Air hole, 53...Second impregnation member, 56...
... Bearing, 57 ... Oil storage space, 61, 62 ... Passage, 59 ... Oil tank, 70 ... Swinging member, 71
...concave groove, 73...fixing screw.

Claims (1)

[Scope of Claims] 1. The inner hook is housed in the outer hook such that the rail formed on the outer circumferential surface of the inner hook fits into the track groove formed on the inner circumferential surface of the rotatable outer hook; An oil storage space having an opening facing the outer hook is formed in the rotating shaft, and the outer hook has an oil discharge port facing the track groove, and a storage hole for storing the first impregnating member, and an oil storage space at the other end. has an oil intake port facing the opening of the oil storage space, and an oil supply passage extending in a radial direction from the oil intake port and communicating with the storage hole, and an air supply passage is formed in the middle of the oil supply passage. 1. A lubricating oil supply device for a sewing machine, characterized in that an air hole is formed therein, and a second impregnated member is filled in a position of the oil supply passage where the air hole communicates with the oil supply passage. 2. The lubricating oil for a sewing machine according to claim 1, wherein the oil intake port is located eccentrically from the rotational axis of the outer hook in a direction opposite to the direction in which the oil supply passage extends. Feeding device.