JPS61130168U

JPS61130168U -

Info

Publication number: JPS61130168U
Application number: JP1322485U
Authority: JP
Priority date: 1985-01-31
Filing date: 1985-01-31
Publication date: 1986-08-14
Also published as: JPH0331267Y2

Description

[Brief explanation of the drawing]

第１図は本考案に係る針糸供給装置の斜視図、
第２図は側面図、第３図は電気回路のブロツク図
、第４図は設定装置の一例を示したブロツク図、
第５図はタイムチヤートである。 FIG. 1 is a perspective view of a needle thread supply device according to the present invention;
Fig. 2 is a side view, Fig. 3 is a block diagram of the electric circuit, Fig. 4 is a block diagram showing an example of the setting device,
Figure 5 is a time chart.

Claims

[Claims for Utility Model Registration] Disposed at a distance on the needle thread path between the thread take-up and the needle thread supply source, so that the needle thread cannot pass through by action and the needle thread can pass by inaction. The first and second holding means 8, 11 that act on the needle thread and the needle thread path between both holding means are changed to increase the length of the path at a time other than the time when the needle thread is tensioned by the thread take-up, and then the thread take-up is carried out by the thread take-up. a feeding device 10 that operates in synchronization with the thread take-up to shorten the needle thread to its maximum tension, and engages the needle thread between the first holding means and the needle thread supply source;
A feed-out detection device 9 generates a thread amount detection signal corresponding to the moving distance of the needle thread, and a position detection device 98 detects a specific rotation angle of the main shaft corresponding to the time when the needle thread is relaxed by the thread take-up and generates a position signal. , a setting device 75 capable of generating a setting signal corresponding to the length of needle thread required to form one stitch in response to different sewing conditions, compares the thread amount detection signal and the setting signal to find that they match. a comparison circuit 78 that generates a match signal when
Upon receiving a position signal, the first holding means is always inactive and the second holding means is active, and upon receiving a coincidence signal, the first holding means is activated and the second holding means is inactive when the needle thread is tensioned by the thread take-up. a needle thread supplying device which operates to supply needle thread fed between both holding means to a thread take-up; A position signal is generated in a sewing machine equipped with a needle thread absorbing device 97 that moves forward against elastic force due to the tension of the needle thread, returns when the needle thread is loosened by a thread take-up, and moves back and forth to absorb the slack. A needle thread supply device for a sewing machine, characterized in that the timing is set within a period from the time when the thread take-up reaches its highest level until before the needle thread absorption device finishes returning.