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Thread trimming mechanism of a sewing machine

A thread-cutting mechanism and technology for sewing machines, which are applied to thread-cutting mechanisms in sewing machines, sewing machine components, and control devices for sewing machines, etc., can solve problems such as single applicability and inability to meet, and save sewing thread costs, avoid waste, and reduce The effect of labor costs

Active Publication Date: 2017-09-01
ZHEJIANG ZOJE SEWING MACHINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But still there are some weak points in the thread trimming mechanism of above-mentioned round head buttonhole machine
In this thread trimming mechanism, both the fixed knife assembly and the moving knife assembly are set horizontally relative to the cloth feeding table, and the bottom thread on the sewn fabric is also slightly curved and roughly horizontal relative to the cloth feeding table. That is to say, when the fixed knife assembly and the moving knife assembly in the thread trimming mechanism are used to cut the bottom thread each time, the cutting position and cutting amount are fixed, although this can ensure that the bottom thread of the same batch of fabrics remains the same. Accurate control of the amount, but it cannot meet the requirements of different fabrics or users for different bottom line margins, so the applicability is relatively single

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • Thread trimming mechanism of a sewing machine
  • Thread trimming mechanism of a sewing machine
  • Thread trimming mechanism of a sewing machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as Figure 1-Figure 4 As shown, a thread trimming mechanism of a sewing machine includes a base 2 fixed in the table 1 of the sewing machine and a straight knife 3 and a rotary knife 4 which are arranged on the base 2 and are in the shape of a sheet. Plate 1 is arranged in a vertical direction and can move up and down, and a cutting edge is formed on the upper end of straight knife 3 . The straight knife 3 is provided with a bar-shaped hole 3 a along its axial direction, and the straight knife 3 is fixed on the base 2 through a positioning screw 5 passing through the bar-shaped hole 3 a and penetrating into the base 2 . Also connected with some limit screws 13 on the base plate, one side of the straight knife 3 is stuck between the limit screws 13 and the base 2 and the gap between the limit screws 13 and the base 2 is slightly larger than the thickness of the straight knife 3 .

[0036] Such as Figure 2-Figure 4 As shown, the base 2 is provided with a positioni...

Embodiment 2

[0045] The structure and principle of this embodiment are basically the same as that of Embodiment 1, the difference is that the driving structure in this embodiment includes a driving cylinder 1 and a driving cylinder 2 fixed in the sewing machine table 1, and the piston rod of the driving cylinder 1 resists Lean against the lower end of straight knife 3, the piston rod of driving cylinder two is connected with the lower end of rotary knife 4. When it is necessary to trim the thread, the piston rod of the drive cylinder 2 is ejected to make the lower end of the rotary knife 4 move upward. Since the middle part of the rotary knife 4 is hinged, the lower end of the rotary knife 4 will rotate around the hinge point when it moves upward, and the upper end of the rotary knife 4 will rotate. During the rotation of the cutting edge, the bottom line will be hooked into the cutting edge. When the rotary knife 4 rotates, the piston rod of the cylinder 1 is driven out to make the straigh...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Abstract

The invention provides a thread trimming mechanism of a sewing machine, which belongs to the technical field of machinery and solves the problems of poor applicability and incapability of controlling the bottom thread allowance of a bottom thread trimming mechanism of an existing sewing machine. The thread trimming mechanism of the sewing machine comprises a base, a straight knife and a driving structure, wherein the base is fixed in a platen of the sewing machine, the straight knife is arranged on the base and is in a shape of a sheet, the straight knife is arranged along the direction perpendicular to the platen and can move up and down, a rotary knife is arranged on the outer side of the straight knife, the rotary knife is hinged to the base, a cutting edge is formed on the upper end of the straight knife, another cutting edge is formed on the rotary knife, the cutting edge of the rotary knife is positioned above the cutting edge of the straight knife, under the driving of the driving structure, the straight knife can move upwards along the vertical direction, and the rotary knife can rotate around a hinged joint. The thread trimming mechanism of the sewing machine has the advantages of wide applicability, capability of controlling the bottom thread allowance and the like.

Description

technical field [0001] The invention belongs to the technical field of machinery and relates to a sewing machine, in particular to a thread trimming mechanism of the sewing machine. Background technique [0002] Sewing machines are widely used in industries such as garment making and textiles. After the sewing machine sews the cloth, the sewing thread needs to be cut off. In the earlier traditional sewing machines, due to the low degree of automation, most of them were not equipped with a special thread cutting mechanism. When the fabric was sewn, the thread was cut manually by the user using scissors and other tools. And along with the continuous advancement of science and technology, the degree of automation of industrial sewing machines is getting higher and higher, and existing industrial sewing machines are basically equipped with automatic thread trimmers accordingly. [0003] For example, the Chinese patent discloses a thread trimming mechanism of a round head button...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D05B65/00D05B29/02D05B69/02
Inventor 李宗润卢孔贵刘占利葛荣楼俏军蒋陈静
Owner ZHEJIANG ZOJE SEWING MACHINE