JP3318377B2 - Needle bar lubrication method and apparatus for sewing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a needle bar lubricating apparatus for lubricating a needle bar bearing of a sewing machine using an oil core.

[0002]

2. Description of the Related Art In this type of lubricating apparatus, an oil core is guided from an oil reservoir provided at an arm base of a sewing machine to a vicinity of a needle bar along an arm, and is directly or oil-absorbed on a needle bar sliding portion. Oil is scattered as the needle bar moves up and down and gradually descends along the needle bar and accumulates on the jaw.Therefore, a sponge is arranged under the needle bar bush and the oil is accumulated. To absorb oil.

When the accumulated oil gradually increases, a problem arises in that the needle bar moves up and down and leaks from below the sponge to the outside of the machine, thereby soiling the cloth to be sewn. 55-502
In No. 7, the oil core is wound around the needle bar holder, and the end of the oil core is protruded to the side to absorb the oil descending along the needle bar with the oil core and to move the needle bar holder up and down. An apparatus is shown in which oil is shaken off from the end of the oil core and scattered in the machine. However, even in this device, the oil adhering below the needle bar holder gradually accumulates in the jaw, which requires an operation for removing the oil and a drain pump.

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for preventing oil leakage from a needle bar, removing oil accumulated in a jaw, and eliminating the need for a pump. It is.

[0005]

According to the present invention, a first oil core is guided from an oil reservoir provided at an arm base of a sewing machine to a vicinity of a needle bar along an arm, and the oil core is attached to the needle bar. In a sewing machine in which the sliding portion of the needle bar is lubricated directly or through a lubricating pad to lubricate the sliding portion of the needle bar, the oil core or the lubricating pad is slidably contacted with the upper part of the bearing portion on the upper side of the needle bar, and the arm is slid. An oil absorbing member is laid on the bottom of the jaw, the first oil core or the oil supply pad and the oil absorbing member are connected by the second oil core, and lubricating oil is supplied from the upper portion of the upper bearing portion to the needle bar near the needle bar. The oil is supplied by circulating by capillary action through a path leading to the upper bearing portion via the oil absorbing member and the second oil core.

[0006]

The lubricating oil is supplied directly from the oil reservoir to the bearing above the needle bar through the first oil core by a capillary phenomenon or via an oil supply pad, and comes into contact with the oil core and the oil supply pad as the needle bar moves up and down. The lubricating oil is applied to the surface of the needle bar. The lubricating oil gradually falling along the surface of the needle bar or after being scattered is absorbed by the oil absorbing member laid on the bottom and rises by capillary action through the second oil core connected to the oil absorbing member. The first oil core connected to the second oil core.
Alternatively, it is returned to the upper bearing again via the oiling pad and is oiled to the needle bar. The lubricating oil passes through the second oil core
Of the oil circulation by the second oil core
State, the capillary phenomenon from the sump by the first oil wick
Is suppressed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. 1 to 3. As shown in FIG. 1, an oil reservoir 3 for filling a lubricating oil 2 is provided at a base side of an arm 1 of a sewing machine. The lower end of the first oil core 4 is immersed in the lubricating oil 2. The oil core 4 is held in a vinyl tube 5 and guided along the arm 1 to the vicinity of the needle bar 6.

This sewing machine is a needle feed sewing machine in which the needle bar 6 swings up and down and back and forth and feeds the fabric by retracting the needle stuck in the fabric when the needle bar descends.
The needle bar 6 is supported by a needle bar bracket 9 which is provided with needle bar bearings 7 and 8 at two upper and lower positions and swings back and forth. A needle bar holder 10 for vertically moving the needle bar 6 is connected to a swing crank 13 via a pin 12 fitted to a groove 11 provided in the needle bar bracket 9 so as to slide the end. .

A first oiling felt 14 (oiling pad) formed in a U shape and having a needle bar passage hole is attached to the needle bar bearing 7 on the upper side of the needle bar bracket 9 so as to sandwich the bearing 7 from above and below. At the same time, the end of the first oil core 4 is pressed against the fueling felt 14 by a cover (not shown). A second oiling felt 15 similarly formed is attached to the lower end of the oiling felt 14 so as to extend over the upper surface of the needle bar bearing 8 below the needle bar bracket 9.

Further, on the lower side of the needle bar bearing 8, there is a collar-1.
6 is fitted, the periphery thereof is covered with a sponge 17, and the lower part of the sponge 17 is brought into contact with an oil absorbing felt 19 (oil absorbing member) laid on the bottom surface of an arm jaw 18;
The oil absorbing felt 19 is connected to the first oil core 4 via the second oil core 20.

In this device, the lubricating oil 2 is transmitted from the oil core 4 to the lubricating felts 14 and 15 and is supplied to the surface of the needle bar 6 which moves up and down in contact therewith. Then, after being transmitted to the needle bar 6 or scattered in the form of a mist, the lubricating oil 2 which has dropped on the jaw 18 of the arm 1 is filled with an oil absorbing felt 19 laid on the bottom.
Is absorbed by Further, the lubricating oil 2 absorbed by the oil absorbing felt 19 is supplied again from the oiling felts 14 and 15 to the surface of the needle bar 6 via the first oil core 4 by the capillary effect of the second oil core 20. You.

[0012]

As described above, according to the present invention, the lubricating oil accumulated in the arm jaw is absorbed by the oil absorbing member laid on the bottom thereof, and the lubricating oil of the second oil core is removed. Since it is sucked up by capillary action and supplied to the needle bar again from the first oil core or the oil supply pad, that is, it is circulated and used, it is not excessively stored at the bottom where the oil absorbing member is laid, and as a result, Oil leakage can be prevented, and thus the consumption of lubricating oil can be reduced. As described above, the lubricating oil can be efficiently circulated in the vicinity of the needle bar only by connecting the upper bearing portion of the needle bar and the oil absorbing member at the bottom with the second oil core. There is no need for devices and the like.

[Brief description of the drawings]

FIG. 1 is a front view of a sewing machine showing an outline of the present invention.

FIG. 2 is a partial perspective view of an apparatus showing one embodiment of the present invention.

FIG. 3 is a partial cross-sectional side view of the apparatus of FIG. 2;

[Explanation of symbols]

 4 ... First oil core 6 ... Needle bar 7, 8 ... Needle bar bearing 14 ... First oiling felt (oiling pad) 18 ... Jaw 19 ... Oil absorption Felt (oil absorbing member) 20 ... second oil core

Claims (2)

(57) [Claims] 1. A first oil core is guided from an oil reservoir provided at an arm base of a sewing machine to a vicinity of a needle bar along an arm, and the first oil core is directly connected to the needle bar through an oil supply pad. In the needle bar lubrication method of the sewing machine, in which
A first oil core or oil supply pad is slidably contacted with the upper portion of the bearing portion on the upper side of the needle bar, and an oil absorbing member is laid on the bottom of the arm jaw, and the first oil core or oil supply pad and the oil absorbing member are laid. And a second oil core to connect the lubricating oil to the upper portion of the upper bearing portion via the needle bar surface, the oil absorbing member, and the second oil core in the vicinity of the needle bar through the capillary to the upper bearing portion. A needle bar lubrication method for a sewing machine, wherein the lubrication is circulated by a phenomenon. 2. A first oil core is guided from an oil reservoir provided at an arm base of the sewing machine to a vicinity of a needle bar along the arm, and the oil core is slid onto the needle bar directly or via an oil supply pad. In a needle bar lubricating device of a sewing machine in which the needle bar slide portion is brought into contact with the needle bar, the oil core or the lubrication pad is slidably contacted with the upper part of the upper bearing portion of the needle bar. A needle bar oil supply device for a sewing machine, wherein an oil absorbing member is laid on the bottom of a jaw of the sewing machine, and the first oil core or the oil supply pad and the oil absorbing member are connected by a second oil core.