Sewing machine with stitch breaking device

Abstract

A thread shear device is used in a multi-needle cylinder sewing machine to sew sleeve-shaped parts such as the collar and the cuff of a T shirt, wherein a long skew line shape is formed along the back side of cloth feeding and the oblique direction away from a cloth feeding groove; therefore, the blade edge of a fixed cutter and the free end edge of a thread gripper plate forming the thread sheardevice swing according to the reciprocating drive of a movable cutter, and move between a thread hooking part arranged at the front end and a part adjacent to a base end; meanwhile, the swinging within the entire reciprocating drive swinging scope of the movable cutter is held and guided between the fixed cutter and the thread gripper plate; through fixing the fixed cutter and the thread gripper plate on the backside of a needle plate under the condition that a side parallel to the cloth feeding direction of the needle plate does not protrude outwards, a convex camber protruding towards one side does not form on a cylindrical pedestal; therefore, a sleeve-shaped part can be easily inserted into the cylindrical pedestal to complete sewing according to requirements; moreover, the thread shear device is in a dispersed state after load is cut off, thereby maintaining excellent sharpness and thread shear function for a long time.

Description

technical field [0001] The present invention relates to a sewing machine with a thread trimmer suitable for sewing tubular parts such as the collar and cuffs of T-shirts and covering seams. Specifically, it relates to a cylindrical base suitable for sewing cylindrical parts, on the free end of which the cylindrical base is fixed perpendicularly to the direction of the cylindrical axis, there are a plurality of needle drop holes and cloth feeding is carried out in the direction of the cylindrical axis. The needle plate with grooves for the cloth feed dog has a looper at the lower part of the needle plate, and at the same time, there is a needle thread on the side of the needle plate to pull the needle thread and looper thread between the needle plate and the looper to the side after sewing. A multi-cylinder sewing machine with a thread trimmer for cutting. Background technique [0002] The thread trimmer in this multi-needle cylinder type sewing machine includes: the front e...

AI Technical Summary

Problems solved by technology

Like this, when inserting the cylindrical part of the product to be sewn into the cylindrical base from its free end side and performing prescribed sewing, because the cylindrical part is hooked by the protruding part and the bulging part of the base, etc., there is a problem that the delivery cannot be exerted. Therefore, the minimum diameter of the tubular part that can be sewn is also limited, and the scope of application is correspondingly narrowed

[0007] Also, in the latter conventional example described in Japanese Publication No. 7-18392, although it is not necessary to use a mounting table other than the needle plate, the number of parts and assembly man-hours can be reduced compared with the former conventional example, but in order to Part of the needle plate and the cylindrical base bulges laterally without hindering the rotation of the movable cutter. , there are the same problems as the former conventional example such as being hooked, and the minimum diameter of the tubular part that can be sewn is also limited, and the same as the former conventional example, the scope of application is narrow

[0008] And, in the conventional examples of the former and the latter, since it is necessary to use the narrow blade edge of the fixed cutter at the same time to be hooked by the thread hook portion of the movable cutter, a plurality of needle threads moved sideways Cutting with the looper thread, so the thread cutting load is very large, there is a common problem that the edge of the blade is worn (that is, the blade is damaged) or deformed in a short period of time, the sharpness is reduced, and the fixed cutter needs to be replaced frequently.

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