Synchronous feeding structure of lower traction wheel

Abstract

The invention provides a synchronous feeding structure of a lower traction wheel, and belongs to the technical field of sewing machines. The problem that an existing sewing machine only uses upper andrear traction wheels for feeding, and accordingly when multiple layers of sewing materials are conveyed, the upper and lower layers of sewing materials are always staggered. The synchronous feeding structure of the lower traction wheel structurally comprises a rotating shaft and the lower traction wheel, the rotating shaft penetrates through a workbench of the sewing machine and is parallel to the upper traction wheel, the rotating shaft is coaxially sleeved with the lower traction wheel, the lower traction wheel is located under the upper traction wheel and opposite to the upper traction wheel, a swing rod is fixed to the rotating shaft, a transmission assembly used for driving the swing rod to swing when a main shaft rotates is arranged between the swing rod and the main shaft of the sewing machine, and a one-way assembly used for limiting the lower traction wheel to rotate in one direction all the time when the swing rod swings is arranged between the rotating shaft and the lower traction wheel. The synchronous feeding structure has the advantages that the structural design is reasonable, the application range is wide, and the sewing materials are not staggered or wrinkled whenmultiple layers of sewing materials are sewn.

Description

technical field [0001] The invention belongs to the technical field of sewing machines, and relates to a synchronous feeding structure, in particular to a synchronous feeding structure of a lower tug wheel which cooperates with an upper tug wheel. Background technique [0002] The feeding method of the traditional sewing machine is the feeding dog, and partly the needle and the presser foot participate in the feeding together with the feeding dog. This feeding method has limited feeding force, especially for sewing materials with special materials, the feeding is more difficult. Indicates that the stitches are too small. For this reason, Chinese patent discloses a kind of rear tugboat device [application publication number CN106676764A], comprises cloth feeding shaft, and cloth feeding shaft is connected with upper crank by more than one connecting rod by lower crank, and upper crank is fixed on the mop shaft, There is also a fixed frame and an adjusting crank on the mop sh...

AI Technical Summary

Problems solved by technology

[0003] Although the cloth feeding through the rear tugboat has the advantages of simple operation and reliability, but in the sewing operation process, because only the upper tugboat pulls the cloth, the upper and lower sewing materials are often misplaced when sewing multi-layer sewing materials, and the sewing materials are prone to tearing. Tendency phenomenon, affecting product quality

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