Needle bar mechanism and sewing machine with the needle bar mechanism

Abstract

The invention discloses a needle bar mechanism. The needle bar mechanism comprises an upper lining, a lower lining, a needle bar and a driving device, wherein the top of the upper lining is sealed, and an oil storage groove is formed in the inner circumference of the lower lining; the upper lining and the lower lining slidably sleeve the needle bar, a top opening is formed in the needle bar, so that a closed inner cavity is defined by the top opening and the upper lining, an oil inlet and outlet hole and a negative pressure interface which are communicated with the inner cavity are formed in the needle bar, and the negative pressure interface is switchably connected with or disconnected with a negative pressure environment; the driving device is used for driving the needle bar to move between the upper lining and the lower lining, when the needle bar moves to the lowest position, the oil inlet and outlet hole is aligned to the oil storage groove, and the negative pressure interface isconnected with the negative pressure environment, so that lubricating oil in the oil storage groove is sucked into the inner cavity; when the needle bar moves up to the oil inlet and outlet hole and is higher than the top of the lower lining, positive pressure is formed in the inner cavity, so that the lubricating oil in the inner cavity is discharged into a main case from the oil inlet and outlethole. By means of the needle bar mechanism, the oil liquid can be prevented from being seeped from the place where the needle bar is matched with the lower lining. The invention further discloses a sewing machine with the needle bar mechanism.

Description

technical field [0001] The invention relates to the technical field of sewing equipment, more specifically, to a needle bar mechanism. In addition, the present invention also relates to a sewing machine comprising the above-mentioned needle bar mechanism. Background technique [0002] The needle bar mechanism in the prior art usually includes a needle bar, and an upper bush and a lower bush respectively sleeved on the upper and lower ends of the needle bar. The upper bush and the lower bush are all fixed in the casing of the sewing machine, and the needle The rod can slide axially relative to the upper bush and the lower bush, and also includes a slider crank mechanism connected with the needle bar for driving the needle bar to move between the upper bush and the lower bush. [0003] When working, when the crank of the crank-slider mechanism rotates around its own center of rotation, the lubricating oil is thrown out from the outer surface of the crank and splashes between ...

AI Technical Summary

Problems solved by technology

[0004] However, this lubricating method will inevitably produce oil leakage at the joint between the needle bar and the lower bush, so that excess lubricating oil will drip out from the bottom of the joint between the needle bar and the lower bush, causing contamination of the sewing material, and even cause the sewing material to be scrapped

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