JPH0641685U - Sewing machine oil supply device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent the leakage of lubricating oil to the outside of the oil supply system in the oil supply device of the sewing machine hook, and to enable appropriate supply of lubricating oil to the prescribed location. [Structure] A first oil supply passage formed in a shuttle shaft for supplying lubricating oil sent from an oil supply source to an outer kettle oil receiver, and an end portion of the first oil supply passage provided opposite to the outer kettle oil receiver. Oil wick mechanism,
A hook oil amount limiting means for adjusting the amount of oil supplied from the outer hook oil receiver to a predetermined portion, and a second oil supply passage formed between the outer hook oil receiver and the outer hook race surface are provided. An oil guide path is provided between the oil core mechanism and the hook oil amount limiting means, and the lubricating oil is directly fed from the first oil supply path to the hook oil amount limiting means. This is a hook refueling device for a sewing machine that prevents leakage of lubricating oil to the machine.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a hook refueling device effective for a sewing hook, particularly a sewing machine having a needle swing function.

[0002]

[Prior art]

 As this type of kettle refueling device, there are conventional ones shown in FIGS. 6 and 7. FIG. 6 is an overall sectional view, and FIG. 7 is an enlarged view of a main part. In the figure, 1 is an outer hook, 2 is an outer hook oil receiver formed at the bottom of the outer hook 1, 3 is a first oil supply passage that penetrates the sewing machine hook shaft 4, and 5 is an end portion of the first oil supply passage 3. A front set screw that is provided at the opening portion of the front end facing the outer pot oil receiver 2, and 6 is an oil core that is inserted into this front set screw 5. The front set screw 5 and the oil core 6 constitute an oil core mechanism. There is. A small hole 5a is formed at the center of the front set screw 5, and the lubricating oil from the first oil supply passage 3 flows into the outer kettle oil receiver 2 through this small hole 5a.

Reference numeral 7 is a felt as a hook oil amount limiting means provided in the outer hook oil receiver 2, and 8 is a second oil supply passage, which connects the outer hook oil receiver 2 and the outer hook lace surface 9. ing. Reference numeral 10 denotes an inner pot, into which a bobbin case (not shown) is fitted. Further, 11 is a hook set screw for fixing the outer hook 1 to the hook shaft 4, 12 is a connecting screw for fitting a tube for connecting the oil supply source and the first oil supply passage 3, and 13 is an oil amount adjusting screw. The lubricating oil that has flowed into the first oil supply passage 3 from the oil supply source penetrates the oil core 6, passes through the small hole 5a, reaches the outer kettle oil receiver 2, and passes through the second oil supply passage 8 by the centrifugal force as the outer kettle 1 rotates. It is supplied to the outer hook racer surface 9 to perform a predetermined lubricating action.

It should be noted that the felt 7 as a means for limiting the amount of oil in the kettle is provided in order to prevent the overflow of the lubricating oil to the outer race surface 9 of the outer kettle and to always supply an appropriate amount of the lubricating oil. It is provided. Further, the oil amount adjustment to the outer kettle oil receiver 2 is performed by the oil amount adjustment screw 13. That is, when the oil amount adjusting screw 13 is tightened, the amount of lubricating oil discharged from the first oil supply passage 3 to the outside decreases, so that the inflow amount of the lubricating oil to the outer kettle oil receiver 2 increases and the oil amount adjusting Untightening the screw will have the opposite effect.

[0005]

[Problems to be solved by the device]

 However, in the above-mentioned conventional technique, as the outer hook 1 rotates, the lubricating oil in the outer hook oil receiver 2 travels through the gap between the hook shaft 4 and the support portion of the outer hook 1 through which the hook is stopped. The phenomenon in which the screw 11 scatters occurs, resulting in the inconvenience that the lubricating oil is not properly supplied to the outer hook racer surface. Further, there is a disadvantage that the sewn product is soiled due to the scattering of the lubricating oil from the hook and the female screw.

The cause is that the lubricating oil in the outer hook oil receiver 2 is difficult to flow toward the second oil supply passage 8 due to the surface tension between the hook shaft 4 and the outer hook 1, and the hook set screw 11 direction. It is thought that it is easy to flow to. Due to the occurrence of such a phenomenon, depending on whether the lubricating oil flows in the direction of the hook set screw 11 or not, the amount of oil supplied to the outer hook race surface 9 naturally changes, and in contrast, Therefore, it becomes difficult for the oil amount adjusting screw 13 to deal with the problem. This difficulty is further promoted by the change of the lubricating oil flow toward the hook set screw 11 in a short time.

[0007]

[Means for Solving the Problems]

 This invention is an oil supply device for a sewing machine hook. In the oil supply device for a sewing machine hook, a lubricating oil sent from an oil supply source is supplied to an outer hook oil receiver, and a first oil supply passage formed in the hook shaft and an external end portion of the first oil supply passage. An oil core mechanism provided opposite to the hook oil receiver, a hook oil amount limiting means for adjusting the amount of oil supplied from the outer hook oil receiver to a predetermined portion, and an outer hook oil receiver and an outer hook race surface. A second oil supply passage formed between them is provided, and an oil guide passage is provided between the oil core mechanism and the shuttle oil amount limiting means to solve the above conventional problems.

[0008]

[Function of the device]

 The lubricating oil that enters the outer hook oil receiver from the first oil supply passage is transmitted to the felt as the hook oil amount limiting means through the oil guide passage, so that the lubricating oil does not flow in the hook set screw direction. A predetermined amount of lubrication can always be smoothly fed to the outer hook racer surface.

[0009]

[Example of device]

 An embodiment of the present invention will be described with reference to the drawings. The same parts as those in the conventional example are designated by the same reference numerals, and the duplicate description will be omitted. FIG. 1 is a diagram showing an embodiment of the present invention. In FIG. 1, reference numeral 21 denotes an oil core as an oil guide path, which is made of felt in this embodiment. The felt 21 as the oil guide path is interposed between the front set screw 5 constituting the oil core mechanism and the felt 7 as the hook oil amount limiting means.

By installing the felt 21 as the oil guide path, the lubricating oil from the first oil supply passage 3 is directly fed to the felt 7 in the outer kettle oil receiver 2, so that the lubricating oil is rotated by the rotation of the outer kettle 1. Does not flow into the gap between the hook shaft 4 and the support portion of the outer hook 1 through which it is inserted, and the entire lubricating oil reaches the outer hook race surface 9 through the second oil supply passage 8. become. . Therefore, the amount of lubricating oil supplied to the outer hook race surface 9 can be accurately controlled by the oil amount adjusting screw described above.

FIG. 2 is a diagram showing another embodiment of the present invention. In this embodiment, the oil conduit is composed of an annular pipe 22. In this embodiment, the outer diameter of the pipe 22 is the same as that of the shuttle shaft 4, but it does not necessarily have to be the same, and the point is that there is a closed space between the small hole 5a of the front set screw 5 and the felt 7. It suffices if it is formed so that the lubricating oil can be prevented from flowing out to the outer surface of the shuttle shaft 4. Note that sponge, plastic sinter, or the like may be used as the oil conduit.

Next, a description will be given of how the lubricating oil is scattered on the outer hook race surface 9 of the lubricating oil and the hook set screw 11 when the outer hook 1 is rotated, in comparison with the prior art. FIG. 3 is a view showing a prior art, and FIGS. 4 and 5 are views showing a scattering state of lubricating oil in the present invention. In each figure, a indicates the state of the lubricating oil scattering (supply) on the outer hook race surface 9, and b indicates the state of the lubricating oil scattering (outflow) on the hook set screw 11. Further, 〓 indicates immediately after the rotation of the outer pot 1, and 〓 and 〓 indicate after a certain time has passed from the start of operation.

In the conventional example shown in FIG. 3, the above-mentioned oil amount adjusting screw 13 is at the same oil amount adjusting position, and immediately after the operation is started, the outer hook race surface and the hook set screw are almost the same. It was found that a large amount of lubricating oil was scattered, but as time passed, a large amount of lubricating oil flowed out in the hook set screw direction and the amount of oil supplied to the outer hook racer surface decreased. The embodiment of the present invention shown in FIG. 5 is at the same oil amount adjusting position of the oil amount adjusting screw 13 described above, and a certain amount of lubrication is applied to the outer hook race face immediately after the start of operation and after a lapse of time. It was found that while the oil was supplied, the lubricating oil was hardly scattered on the hook set screw.

FIG. 4 shows the lubrication of the outer hook race face 9 and the hook set screw 11 at various points when the amount of oil supplied to the outer hook oil receiver is adjusted by the oil amount adjusting screw 13 in the embodiment of the present invention. It is a figure which shows the scattering state of oil. In this experiment, the oil amount adjusting screw 13 was tightened to increase the amount of oil supplied, and the operation was started. In 〓, which shows immediately after, the lubricating oil on the outer hook race face 9 is considerably large.

Next, when the oil amount adjusting screw is released after a lapse of a certain time to reduce the supply amount, the scattering of the lubricating oil on the outer hook race surface 9 is also reduced. After a certain period of time, it was found that if the amount of oil was further reduced, the scattering of lubricating oil on the outer kettle race surface was further reduced. On the other hand, in any case, scattering of the lubricating oil on the hook set screw 11 is hardly seen. Thus, according to the present invention, the oil amount adjusting screw 13 can appropriately adjust the supply of the lubricating oil to the outer hook racer surface 9.

[0016]

[Effect of device]

 This invention is an oil supply device for a sewing machine hook. In the oil supply device for a sewing machine hook, a lubricating oil sent from an oil supply source is supplied to an outer hook oil receiver, and a first oil supply passage formed in the hook shaft and an external end portion of the first oil supply passage. An oil core mechanism provided opposite to the hook oil receiver, a hook oil amount limiting means for adjusting the amount of oil supplied from the outer hook oil receiver to a predetermined portion, and an outer hook oil receiver and an outer hook race surface. Since the second oil supply passage formed between them is provided, and the oil guide passage is provided between the oil core mechanism and the kettle oil amount limiting means, all the lubricating oil fed to the outer kettle oil receiver is provided. It is supplied to lubrication points and proper lubrication is performed. In addition, since the lubricating oil does not leak to the outside of a predetermined lubrication point, the oil amount can be adjusted exactly as specified and the sewn product is not contaminated due to the leakage of the lubricating oil.

[Brief description of drawings]

FIG. 1 is an enlarged sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of an essential part showing another embodiment of the present invention.

FIG. 3 is a distribution diagram showing a scattering state of lubricating oil in a conventional example.

FIG. 4 is a distribution diagram showing a change in a scattering state of lubricating oil according to the adjustment of the amount of oil supply in the embodiment according to the invention.

FIG. 5 is a distribution diagram showing a scattering state of lubricating oil before and after an operating time has passed in an embodiment of the present invention.

FIG. 6 is a side sectional view showing a conventional kettle oil supply device.

FIG. 7 is an enlarged cross-sectional view of a main part in FIG.

[Explanation of symbols]

 1 Outer hook 2 Outer hook oil receiver 3 First oil supply passage 4 Sewing machine hook shaft 5 Front set screw 7 Felt 8 Second oil supply passage 9 Outer hook lathe surface 21 Felt (oil guide passage) 22 Annular pipe (oil guide passage) )

Claims (1)

[Scope of utility model registration request] 1. A first oil supply passage formed in a shuttle shaft for supplying lubricating oil sent from an oil supply source to an outer hook oil receiver, and a first oil supply passage.
An oil core mechanism provided at the end of the oil supply passage so as to face the outer hook oil receiver, a hook oil amount limiting means for adjusting the amount of oil supplied from the outer hook oil receiver to a predetermined portion, an outer hook oil receiver, and A sewing machine hook oil supply device comprising a second oil supply path formed between the outer hook race surface and an oil guide path provided between the oil core mechanism and the hook oil amount limiting means. .