Modified forked feed lifting rock shaft crank

Abstract

The invention belongs to the technical field of accessories of sewing machines, and particularly relates to a modified forked feed lifting rock shaft crank. A protruding block is axially arranged on one side of the outer cylindrical surface of a barrel, an opening communicated with a central hole of the barrel is formed in the protruding block, a fastening screw penetrating through the opening is arranged on the protruding block, a forked plate is radially arranged on the side, with the protruding block, of the barrel, the forked plate comprises a fork opening used for arranging a sliding block, the bottom of the fork opening is solid, the barrel, the protruding block and the forked plate are made of powder containing oil in a metallurgical mode. The modified forked feed lifting rock shaft crank is made to have the advantages of being resistant to abrasion, good in lubricating property by controlling the matching of certain powder components and oil content; porosity is controlled by controlling the density degree of the powder, a certain amount of lubricating oil can ooze out of holes in crank materials along with changes of rotating speed and temperature, and therefore a lubricating effect is achieved; material cost is low, processing technic is simple, the modified forked feed lifting rock shaft crank is pressed, sintered and formed once through powder in the metallurgical mode, and the structure is simplified.

Description

Technical field: [0001] The invention belongs to the technical field of sewing machine accessories, in particular to an improved fork-shaped tooth lifting crank. Background technique: [0002] The current fork-shaped tooth-lifting crank is made of steel castings. The steel castings require processes such as billet casting, turning, drilling, grinding, and twisting. The processes are complicated and the cost of materials is high. [0003] The working condition of the fork lift crank has two characteristics: [0004] 1. The fork of the fork-shaped lifting crank and the slider are under the pressure of feeding, and they slide against each other. If the lubrication is not good, it is easy to get stuck. Therefore, it is necessary to lubricate the fork of the fork-shaped lifting crank and the slider. Lubrication requirements are relatively high. [0005] 2. The fork-shaped tooth-lifting crank is set close to the rotary hook, directly below the sewing material, and there should b...

AI Technical Summary

Problems solved by technology

[0006] In the current technology, in order to solve the lubrication problem between the fork and the slide block of the fork-shaped lifting crank, the following structure is adopted to realize (see figure 1 ): By drilling a longer oil hole on the tooth-lifting shaft 1 (through the tooth-lifting crank), drilling the oil hole on the fork-shaped tooth-lifting crank 2, and then passing the oil line 3 through the oil hole of the tooth-lifting shaft 1 and the fork The oil hole on the fork 4 of the lift crank 2 is set in the fork 4 of the fork-shaped lift crank 2 to lubricate the slider 5 by dripping oil, which has defects such as complex structure and inconvenient processing.

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