Auxiliary feeding device for sewing machine

Abstract

The invention belongs to the technical field of sewing machines, and specifically relates to an auxiliary feeding device for a sewing machine. The device comprises an one-way clutch driving assembly and a dragging wheel assembly; the one-way clutch driving assembly comprises an one-way clutch driving planetary gear shaft which is connected through a coupling and rotates in one direction, and a large synchronizing wheel hinge pin; a driving swinging rod sleeves the one-way clutch driving planetary gear shaft; the other end of the driving swinging rod is connected with one end of a connecting rod through the hinge pin; an adjusting connecting rod which is connected with the swinging shaft is arranged on the other end of the connecting rod; the dragging wheel assembly comprises a large synchronizing wheel, a first small synchronizing wheel and a second small synchronizing wheel; synchronizing belts are arranged at the outsides of the large synchronizing wheel, the first small synchronizing wheel and the second small synchronizing wheel; compressing wheels for tensioning the synchronizing belts are arranged on the synchronizing belts. The device is high in reliability, durability and stability; materials can be synchronously and stably fed, and the material grabbing force and driving force are high during passing through a joint, thus the sewing is smooth, and the stitches are uniform and nice.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of sewing machines, in particular to an auxiliary feeding device for sewing machines. [0003] Background technique: [0004] At present, most of the auxiliary feeding driving wheels of sewing machines use steel-faced toothed wheels or rubber-faced wheels. Since the auxiliary tugwheels are in line contact with the sewing material, the gripping force is relatively small, and there is a phenomenon that the joint (splicing bone) is easy to slip, thus It leads to the unsmooth passing of the joint (splicing bone position) or the phenomenon of needle pitch becoming dense due to the jamming of the joint. [0005] In addition, most of the current auxiliary feeding driving wheels use the built-in one-way clutch needle roller or one-way clutch star wheel inside the driving wheel. Due to the limitation of position, space and structure, it is impossible to set up to ensure the lubrication of the one-way clutch mo...

AI Technical Summary

Problems solved by technology

[0004] At present, most of the auxiliary feeding driving wheels of sewing machines use steel-faced toothed wheels or rubber-faced wheels. Since the auxiliary tugwheels are in line contact with the sewing material, the gripping force is relatively small, and there is a phenomenon that the joint (splicing bone) is easy to slip, thus Leading to unsmooth over-joint (splicing bone position) or the phenomenon of needle distance becoming dense due to the jamming of the joint

[0005] In addition, most of the current auxiliary feeding driving wheels use the built-in one-way clutch needle roller or one-way clutch star wheel inside the driving wheel. Due to the limitation of position, space and structure, it is impossible to set up to ensure the lubrication of the one-way clutch moving parts, so that this type of auxiliary feeding Drive wheels have a shorter service life

At the same time, most of the driving wheels of this type of auxiliary feeding are driven by ball joint rods or connecting rods and axial screw structures to drive the driving wheels in one direction. The ball joint rods or connecting rods and axial screw structures cannot guarantee lubrication, which is easy to cause parts Wear, resulting in gaps, which affect the real-time effectiveness of the auxiliary feed drive wheel feeding

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