JPS5927598B2 - Lubrication device for rotating lockstitch hook - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention comprises a hook body and an annular groove in the hook body, the annular groove opening toward the bottom is provided for attaching a felt disk, and the annular groove The present invention relates to a lubricating device for the running path of a rotating lockstitch hook of a sewing machine, which communicates with the running path of the hook through an inclined hole.

A lubricating device according to the generic concept of claim 1 is known (German Patent Application No. 25542)
In this device, oil is fed by capillary action of the core lubricator to an oil chamber configured as an undercut recess, and from the oil chamber a conduit that is opened only at the inlet and outlet by centrifugal action is fed. directly to the driving route.

This known lubrication procedure does not allow sufficient lubrication of the running track when restarting the sewing machine, especially after a long sewing pause.

This is because the amount of residual oil remaining in the oil chamber does not immediately or exclusively enter the conduit provided exclusively for reaching the travel path from the oil chamber.

Furthermore, a lubricating device according to the generic concept of claim 1 is known (German Patent No. 260,727).
9), the hook body of this device has in its inner region a recess opening towards the bobbin case, and which opens at the bottom into a deeply milled oil pan.

In this known lubricating system, when a previously rested gear is accelerated, most of the oil accumulated in the oil pan is fed to the running path.

In this case, a portion of the oil accumulated due to the open recess leaks,
Therefore, by lubricating it, it reaches the feminine stage.

Another defect occurs when the lint that collects in the interior space of the hook body is penetrated by oil.

Therefore, it is difficult to prevent contamination of the needle thread loop guided around the bobbin case during sewing.

The main problem of the invention as set forth in claim 1 is that the lubricating device is provided with at least one closed hollow chamber adjacent to the running path, and a hole communicating the hollow chamber with the oil chamber. Another object of the present invention is to provide a lubricating device which eliminates the deficiencies of known lubricating devices by having a blind hole that communicates the running path and the hollow chamber open.

With the lubricating device according to the present invention, even when the sewing machine is restarted due to centrifugal action (also when sewing a small number of stitches) and even when sewing extremely short lengths, Lubrication that is limited to the beginning and only to the running path is guaranteed.

Reasonable developments of the subject matter of claim 1 are explained in the dependent claims.

With the construction of the lubricating device according to claim 2, it is achieved that during the rest phase of the kettle, the amount of residual oil flowing back into the hollow space cannot leak out of the hollow space due to the adhesive force generated.

In order to prevent residual oil from leaking without requiring the action of adhesive force,
This lubricating device is constructed according to claim 5.

The present invention will be described in detail below with reference to FIGS. 1 and 2.3.

In a bearing housing shown in 1 of a known lockstitch sewing machine (not shown in detail), a hook shaft 3 is rotatably supported by a plurality of rolling bearings 2.

A rotating lockstitch hook 4, which is known per se, is connected by a plurality of countersunk screws to a flange 21 located above and adjacent to the hook shaft 3.

The lockstitch hook 4 generally consists of a bobbin case 9 that accommodates a bobbin thread therein, a forceps body 15, and an oil ring 16 fixed to this body.

An annular track 10 in the hook body 15 accommodates a bearing rib 22 extending around the circumference of the non-rotatable bobbin case 9.

Oshikatsukama body 15 made as a part of the ring member
The lid 18, which can be screwed on, can perfectly support the hook body 15 with the bearing ribs 22.

For the lubrication of the track 10, a wick lubricating device known per se is used, in which oil flows into the vicinity of the oil ring 16 from an external lubricant tank provided by the sewing machine by C capillary action inside the wick 5. be done.

The core 5 is guided inside the bearing housing 1 via a flexible hoter member 7 .

In a known manner, the oil supply can be adjusted by rotating the adjusting screw 8 which compresses the aus member 7 and the portion of the core 5 contained therein.

The terminal end of the hook full of the core 5 is accommodated in a ring 23 in an annular shape.

For this purpose, the groove provided is only deep enough in the ring 23 that a portion of the periphery of the core protrudes from the ring 23 and therefore comes into contact with the disk 6.

The projections of the disk spring 20, which are uniformly distributed in the inner circle and are pressed towards the top, press against the underside of the link 23, so that the part of the core 50 which is annularly accommodated by the ring 23 is cut off. contact with the disc 6.

A disc 6, preferably made of spring strip steel, is fixed in a fitted manner by a suitably constructed shoulder of the hook shaft 3.

Therefore, the board 6 is carried by the rotary movement of the hook shaft.

Due to the contact with the core 5, the disc 6 is moistened with oil.

Due to the centrifugal action of the rotating disc 6, the oil thrown out from the core 5 reaches near the periphery of the disc 6, and the oil is now blown off in droplets.

As can be seen in FIG. 1, an oil ring 160 annular recess (indicated as oil chamber 12) projects from disc 6.

The oil thrown away from the disc 6 now reaches the tapered point of the oil chamber 12.

The oil ring 16 has two hollow chambers 1 configured as recesses.
I have 1.

Sealing ring 17 inserted into each hollow chamber 11 Holder body 1
The contact point of the oil ring 16 with respect to the oil ring 5 is sealed.

Hole 1 inside the inner circle of sealing ring 17 into hollow chamber 11
3 is open, and this hole terminates at the tip of an undercut oil chamber 12 at the other end.

The holes 13 are provided in the oil ring 16 so as to be inclined vertically or obliquely depending on the structural condition.

Furthermore, the blind hole 14 opens into the hollow chamber 11 at a point which is farthest away from the center of rotation but is located inside the inner circle of the core ring 17, and this hole opens into the hollow chamber 11 and the running path 10.
The grip main body 15 is provided at an angle with respect to the vertical line.

The tip of the blind hole 14 is not higher than the upper edge of the running track 10.

Therefore, due to the centrifugal action of the rotating hook 4, the oil chamber 12
The oil in the corner ending in the tip of the hole 13 and the blind hole 14
It reaches the driving route 10 through the road.

The height of the cylindrical hollow chamber 11, which is evident from FIG. is designed to.

Therefore, the effective volume of the hollow chamber 110 for further filling is made larger than the volume of the blind hole 14 9 and the hollow chamber 11
It is necessary that the opening areas of the blind holes 14 and the holes 13 do not overlap or only slightly overlap.

After shutting off the sewing machine, the oil present in the blind hole 14 flows out into the hollow chamber, which oil cannot flow out of the chamber even after a long period of time due to the adhesive force generated.

Therefore, even after relatively long sewing breaks, a constant amount of oil is available when restarting the sewing machine, and this amount of oil can be used immediately even with small centrifugal effects and with very short sewing lengths. From this point on, the running track 10 can immediately begin to be lubricated.

In this case, so-called staged lubrication is important. This is because as the number of rotations of the lockstitch hook 4 increases, oil from the outer lubricant tank is fed to the travel path as described above.

The invention is not limited only to the embodiments described in this specification and relating to the lubrication of a rotating lockstitch hook 4 with a vertically mounted hook shaft 3.

In this case, the described lubricating device is installed horizontally on the hook shaft 3.
It can also be used with lockstitch hooks.

Hollow chamber 11 Characteristics of the described lubricating device
5 or partly in this body and partly in the oil ring 16 (see FIG. 3).

After all, the hollow space 11 can not only be cylindrical but also have a different shape.

In the configuration according to claim 5, the hollow chamber 11 has a recess 24 at the bottom of the upper edge of the bore 13, which accommodates the amount of residual oil that flows back during the shutdown period.

In this case, it is preferable to open the tube piece 25 that rises into the hollow chamber 11.

[Brief explanation of drawings]

FIG. 1 is a sectional view of the rotary hook and rotary hook drive device, FIG. 2 is an enlarged sectional view of a hollow chamber having a plurality of holes opening therein, and FIG. 3 is an enlarged sectional view of the hollow chamber according to claim 5. It is a diagram. 10... Running path, 11... Hollow chamber, 1
2... Oil chamber, 13... Hole, 14...
...Blind hole.

Claims (1)

[Claims] 1. Consisting of a hook body and an annular groove in the hook body, the annular groove opening toward the bottom is provided for attaching a felt disk, and the annular groove is provided at an angle. In a lubricating device for the running path of a rotating lockstitch hook of a sewing machine, which communicates with the running path of the hook via a hole, at least one sealed hollow chamber 11 adjacent to the running path 10;
A lubricating device characterized in that a hole 13 that communicates an oil chamber 12 with a hollow chamber 11 and a blind hole 14 that communicates a running path 10 with a hollow chamber 11 are opened. 2. A hollow chamber 11 is provided in the oil ring 16 and sealed against the hook body 15 by a sealing ring 17, and the effective volume of the hollow chamber 110 to be filled is larger than the volume of the blind hole 14, and the hollow chamber 110 is A patent characterized in that the chamber 11 has a cylindrical shape and the height h of the hollow chamber 11 is designed so that sufficient adhesive force acts on the oil in the hollow chamber 11 to prevent oil from leaking. A lubricating device according to claim 1. 3. The blind hole 14 opens into the hollow chamber 11 at the point furthest from the center of rotation 19 but located inside the inner circle of the sealing ring 17, and the other side of the blind hole 14 opens into the running track 10 and the blind hole 14. The lubricating device according to claim 1, wherein the hook body 15 is provided at an angle with respect to a perpendicular line. 4. The lubricating device according to claim 1, wherein the opening areas of the blind hole 14 and the hole 13 do not overlap. 5 a recess 24 in which the hollow chamber 11 is located at the lower part of the upper edge of the hole 13;
A lubricating device according to any one of claims 1 to 4, characterized in that it has the following.