Lubricating oil seal structure of the presser lift shaft

Abstract

The invention provides a lubricating oil sealing structure for a presser foot lifting shaft. The structure comprises an oil box arranged at the front end of a sewing machine shell, wherein an oil filling port is formed in the upper end of the oil box, an oil outlet is formed in the lower end of the oil box, and plugs are installed in the oil filling port and the oil outlet respectively. The presser foot lifting shaft penetrates through the left side and right side of the oil box, shaft sleeves supporting the presser foot lifting shaft are arranged on the left side and right side of the oil box respectively, and oil seals are arranged between the two shaft sleeves and the presser foot lifting shaft respectively. By arranging the oil seals between the shaft sleeves and the presser foot lifting shaft, lubricating oil of the presser foot lifting shaft can be sealed in the oil box reliably, lubricating oil in the oil box can only circulate inside the oil box and the shaft sleeves, and the situation that oil leaks and carries scrap iron generated during wearing to cause machine head corrosion is avoided. Meanwhile, long-term and reliable lubrication of the spaces between the shaft sleeves and the presser foot lifting shaft is achieved through lubricating oil in the oil box, so that abrasion loss of the presser foot lifting shaft is reduced and noise generated when the presser foot lifting shaft works is low.

Description

technical field [0001] The invention relates to the technical field of a presser foot lift shaft of a sewing machine, in particular to a lubricating oil sealing structure of a presser foot lift shaft. Background technique [0002] In the prior art, the lifting shaft of the presser foot of the sewing machine is often worn seriously due to lack of lubrication during work, and relatively large noise is generated during the working process. Therefore, more and more sewing machines use oil for the lifting shaft of the presser foot Lubrication measures, however, refueling and lubrication will cause the worn iron filings to corrode the sewing machine head, causing trouble to the normal operation of the sewing machine. In response to this situation, different sewing machine manufacturers have adopted different solutions. At present, most sewing machine manufacturers use the method of adding oil holes in copper sleeves. This method reduces the wear of the presser foot lifting shaft, ...

AI Technical Summary

Problems solved by technology

[0002] In the prior art, the lifting shaft of the presser foot of the sewing machine is often worn seriously during work due to lack of lubrication, and relatively large noise is generated during the working process. Therefore, more and more sewing machines use oil for the lifting shaft of the presser foot Lubrication measures, however, refueling and lubrication will cause worn iron filings to corrode the sewing machine head, causing troubles to the normal operation of the sewing machine

In response to this situation, different sewing machine manufacturers have adopted different solutions. At present, most sewing machine manufacturers use the method of adding oil holes in copper sleeves. This method reduces the wear of the presser foot lifting shaft, but the iron filings caused by wear Corroded sewing machine heads still exist

At present, there is a sewing machine on the market that adopts an integrated type of presser foot lifting shaft, which connects the positions of the two fixed bushings of the casing, and then expands the middle part of the shaft hole to store oil for lubrication. The wear situation is greatly reduced, but it still cannot completely avoid the worn iron filings from corroding the machine head, and it also makes the casting mold opening of the machine shell more complicated

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