A sewing machine with a threader

Abstract

The invention discloses a sewing machine provided with a thread passing device. The sewing machine provided with the thread passing device comprises a machine frame, a sewing machine handpiece, a transmission mechanism controlling the handpiece to conduct sewing, the thread passing device and a plurality of fasteners. The sewing machine handpiece and the transmission mechanism are arranged on the machine frame, and the thread passing device is fixed to the sewing machine handpiece through the fasteners. The thread passing device comprises a support, a platen, a connecting plate, a plurality of locating columns, pressing sheets, pressing ring blocks, threading shafts and air cylinders, wherein the platen is arranged at the bottom of the support, the connecting plate is arranged below the platen, the locating columns are arranged on the platen, the pressing sheets are connected to the locating columns respectively, each pressing ring block is arranged above the corresponding pressing sheet, each threading shaft is arranged between the corresponding pressing ring block and the corresponding pressing sheet, the pressing ring blocks and the pressing sheets can both move in the length direction of the threading shafts, a first threading hole is formed in each threading shaft, the air cylinders are connected to the upper portions of the pressing ring blocks respectively, and the air cylinders are fixed to the support. According to the sewing machine provided with the thread passing device, the adopted air cylinders exert balanced and stable force, the thread knotting phenomenon is avoided, the production efficiency of the sewing machine is guarnteed, and the production cost is reduced.

Description

technical field [0001] The invention relates to a sewing machine, in particular to a sewing machine provided with a thread passer. Background technique [0002] In textile equipment such as sewing machines, thread guides are very common. At this time, because the needle thread of the sewing machine is in use, the tightness of the needle thread itself should be moderate. The yarn is prone to stress concentration and thread breakage. [0003] Therefore, in the existing sewing machine textile equipment, thread guides are used to adjust the tightness of the yarn itself. Most of the existing thread guides use springs to adjust the tightness of the thread and needle thread. However, all shortcomings have been found in practical applications. If the spring is used for crimping, the uneven force on both sides of the crimping thread will cause the crimping thread to be unstable. During the use of the sewing machine, it is easy to loosen, resulting in knotting of the needle and threa...

AI Technical Summary

Problems solved by technology

[0002] In textile equipment such as sewing machines, thread guides are very common. At this time, because the needle thread of the sewing machine is in use, the tightness of the needle thread itself should be moderate. The yarn is prone to stress concentration and thread breakage

[0003] Therefore, in the existing sewing machine textile equipment, thread guides are used to adjust the tightness of the yarn itself. Most of the existing thread guides use springs to adjust the tightness of the thread and needle thread. However, all shortcomings have been found in practical applications. If the spring is used for crimping, the uneven force on both sides of the crimping thread will cause the crimping thread to be unstable. During the use of the sewing machine, it is easy to loosen, resulting in knotting of the needle and thread. The production efficiency of the sewing machine is low, and the workers have to perform manual operations after knotting, which increases the labor intensity of the workers and indirectly increases the production cost, which is not conducive to the large-scale promotion and application of the sewing machine

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