Method and apparatus for automatic adjustment of thread tension

A technology of tension and input device, which is applied in the field of sewing device and lock seam, to achieve the effect of improving uniformity, reducing labor cost and accurate adjustment

Inactive Publication Date: 2001-07-25
MCET
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The infrequent tension adjustments of the prior art are problematic because different s

Method used

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  • Method and apparatus for automatic adjustment of thread tension
  • Method and apparatus for automatic adjustment of thread tension
  • Method and apparatus for automatic adjustment of thread tension

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0053] Detailed description of the preferred embodiment

[0054] refer to figure 1 , figure 1 Shown is a block diagram showing the main components of a sewing device. The sewing device 20 includes a tensioning assembly 22 , a thread length encoder 23 , a sewing machine 21 , an operator input device 24 and a sewing control system 25 . The sewing control system 25 includes a computer that receives input from an operator input device 24 and a thread length encoder 23 . These operator inputs are used along with decorative pattern information to determine how sewing control system 25 monitors sewing machine 21 and tensioning assembly 22 as sewing is performed.

[0055] The sewing machine 21 in the preferred embodiment includes all remaining items needed to complete sewing. Among the remaining items described are: a needle, a drive to move the fabric between two axes, a thread guide, a presser foot, a thread take-up lever, a thread crimp, a thread break detector and a Bottom li...

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PUM

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Abstract

A computerized stitching apparatus that automatically controls thread tension is disclosed. In one embodiment, at least two factors are used to determine the desired thread consumption for the next stitch. A thread length encoder (23) is used to determine the amount of thread actually consumed for a particular stitch. The operator must enter a desired thread length ratio or an equivalent factor related to desired thread length used for a particular stitch into the operator input device (24). Another factor such as speed, stitch length, fabric thickness, or stitch angle change is used with at least the operator's input to determine the desired thread consumption. The tension of the thread is adjusted by a stitch control system (25) which will affect the actual thread consumed for the particular stitch.

Description

field of invention [0001] The present invention relates to a sewing device and a method for overlocking, and more particularly, the present invention relates to a computer-controlled overlocking device and method capable of automatically adjusting thread tension. Background of the invention [0002] For forming overlock seams in fabrics, overlock devices of various designs and configurations have now been developed. To create a decorative pattern, a series of lockstitches can be placed on the fabric. These decorative patterns can be programmed in a computer or in a sewing control system that moves the needle and fabric to lock stitch the desired decorative pattern. The top and bottom threads cooperate with the needles to form a lock seam on the fabric. The top thread comes from the upper side of the fabric and the bottom thread comes from the lower side of the fabric. Modern sewing devices often have multiple needles per head and multiple heads per machine, with 12 needle...

Claims

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Application Information

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IPC IPC(8): D05B19/12D05B45/00D05B47/04D05B47/06
CPCD05C11/14D05D2205/085D05B19/12D05B51/00D05D2205/16D05B47/06D05B45/00D05B47/04
Inventor 兰德尔·梅尔顿威廉·R·蔡尔兹弗农·S·特纳
Owner MCET
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