• Title/Summary/Keyword: 톱니 이송기구

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Mechanism Analysis and Optimum Design of Feeddog Transfer Mechanism and Needle Stitching Mechanism of an Industrial Needle Driven Sewing Machine (공업용 침송 재봉기의 톱니와 바늘대 이송 메카니즘 해석 및 최적설계)

  • Lee, J.Y.;Chun, K.J.
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.10
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    • pp.35-43
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    • 1997
  • In this paper, we perform a mechanism analysis and optimal design of the feeding system in a industrial sewing machine. Sewing machines are classified by the transfer mechanism as (1) transferred by feeddog only (2) transferred by feeddog and needle (3) transferred by feeddog, needle and pressure bar. The sewing machine classified as (2) is studied which is more efficient in transferring fabrics than the machine classified as (1). In analyzing the mechanism, we divide the feeding mechanism as feeddog mechanism and needle bar mechanism. The two mechanisms are conneted with each other kinematically because fabrics are transferred by two needles and a feeddog simultaneously and stitched by two needles which pass through the feeddog in every stitch cycle. We define good stitch as coincidence of stitch between the forward and reverse motion of feeding. We optimize the feeding mechanism for that purpose. It is illustrated that stitching performance of the optimized mechanism is compared to original feeding mechanism.

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A Study on Feed Dog Motion of a Lock Stitch Sewing Machine (본봉용 재봉기의 톱니 운동에 관한 연구)

  • 전경진;송창섭;신대영
    • Journal of the Korean Society for Precision Engineering
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    • v.15 no.12
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    • pp.37-47
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    • 1998
  • This study discusses the feed dog feeding mechanism of an industrial lock stitch sewing machine, which is a good example to study a machine kinematics. The feed dog feeding mechanism makes the fabrics directly be fed by an elliptic motion of the feed dog that is moved by a rotation of the top shaft and controlled by the feeding control mechanism. This study makes mathematical expressions of machine's motion in the feed dog feeding mechanism. Thus, the motions of this mechanism are characterized, namely how an elliptic motion of the feed dog is affected by the feeding control mechanism. Therefore, the above mathematical expressions may be a basis for the new design of the feed dog feeding mechanism and may be adapted to analysis. Development of the similar feed dog feeding mechanism can be applied to other type sewing machine.

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