Lower shaft support device for sewing machine

Abstract

Disclosed is a lower shaft support device for a sewing machine. The present invention relates to a lower shaft support device for a sewing machine, wherein a main body of the sewing machine has an upper portion which comprises an angle arm and a lower portion which comprises a bed, an upper shaft is installed along the angle arm for vertically moving a lockstitch needle on the main body, and a lower shaft is installed on and supported by the main body of the sewing machine so as to be linked to the upper shaft. The lower shaft support device comprises: at least one cast bushing, which is formed on the bed, so that the lower shaft can be installed along the bed; a hole which penetrates the cast bushing; and a fixing part which penetrates through the hole to rotatably support the two ends of the lower shaft with respect to the bed, wherein the lower shaft of the sewing machine is directly supported by the fixing part through a simple operation using the cast bushing that is integrally formed with the bed, without having to be supported by a separate bearing metal bush.

Description

technical field [0001] The invention relates to a lower shaft support device of a sewing machine, more specifically, to a lower shaft support device of a sewing machine which does not use a special bearing metal bush for support during the process of installing the lower shaft on a sewing machine tool. Background technique [0002] Such as figure 1 As shown, the driving shaft of the double-thread interlocking sewing method (lockstitch) sewing machine 100 can be divided into an upper shaft 102 installed along the angle arm 101 and a lower shaft 104 installed along the machine tool 103 and arranged, wherein the lower shaft 104 is arranged in the form of a thread Two lower shafts are divided in parallel on both sides of the cylinder shaft as the center. [0003] The prior art discloses a thread spool and a driving device related to its driving (refer to Korean Patent Publication No. 10-1998-073037), and its technical features include: the upper shaft 102 enables the needle 105...

AI Technical Summary

Problems solved by technology

[0008] like image 3 As shown, observing the support structure of the lower shaft 104 of the machine tool 103 of the sewing machine, it can be seen that the part in contact with the machine tool 103 is equipped with a special bearing metal bushing 200 to support the lower shaft 104, but this lower shaft support structure is difficult to operate for a long time. Continuously eliminate the inter-shaft noise and vibration caused by the wear and deformation of the bearing metal bushing

Moreover, since a plurality of bushes need to be fitted and fixed on each shaft respectively, not only the number of parts is increased, but also the number of assembly processes of the bearing metal bushes is also increased, but it cannot meet the requirements of high precision.

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