JPH0441376U

JPH0441376U -

Info

Publication number: JPH0441376U
Application number: JP8157690U
Authority: JP
Priority date: 1990-07-31
Filing date: 1990-07-31
Publication date: 1992-04-08

Description

[Brief explanation of the drawing]

第１図ないし第３図は、この考案に係るミシン
の上糸供給装置の一実施例を示す図で、第１図は
、糸張力検知手段を示す外観斜視図、第２図は、
第１図に示した糸張力検知手段のミシンの上糸供
給装置における設置位置を示す平面図、第３図は
、ミシン制御手段の構成状態を示すブロツク図、
第４図は、従来のミシンの上糸供給装置の構成を
示す平面図である。図において、Ａ……糸張力検知手段、Ｒ……糸
繰り出し機構、１……上糸、２……第１挟持機構
、３……第２挟持機構。 1 to 3 are views showing an embodiment of the needle thread supplying device of the sewing machine according to the present invention, FIG. 1 is an external perspective view showing the thread tension detection means, and FIG.
FIG. 1 is a plan view showing the installation position of the thread tension detection means in the needle thread supply device of the sewing machine; FIG. 3 is a block diagram showing the configuration of the sewing machine control means;
FIG. 4 is a plan view showing the configuration of a needle thread supply device of a conventional sewing machine. In the figure, A...thread tension detection means, R...thread pay-out mechanism, 1...needle thread, 2...first clamping mechanism, 3...second clamping mechanism.

Claims

[Scope of Claim for Utility Model Registration] A needle thread pay-out mechanism that sends out needle thread from a needle thread supply source in the direction of the sewing needle; A first thread clamping mechanism adjusts the supply amount, and a second thread clamping mechanism is located between the sewing machine's thread take-up and needle thread pay-out mechanism and releases the clamped needle thread when the thread take-up is raised.
In a needle thread feeding device of a sewing machine equipped with a thread clamping mechanism, a thread tension device is provided between the needle thread pay-out mechanism and the second thread clamping mechanism, and detects the tension of the needle thread between the two and outputs a tension value. a detecting means; and a sewing machine control means connected to the thread tension detecting means and controlling the driving of the first thread clamping mechanism and the sewing machine, wherein the thread tension detecting means detects that the needle thread tension is at a high value. If the upper thread tension is detected to be a low value by the thread tension detection means, the sewing machine control means increases the amount of needle thread supplied by the first thread clamping mechanism. An upper thread supply device for a sewing machine, characterized in that the amount of upper thread supplied by a clamping mechanism is reduced.