Thread-tension regulating device for multi-thread sewing machine

Details Thread-tension regulating device for multi-thread sewing machine Thread-tension regulating device for multi-thread sewing machine

1978-09-19

1981-11-17

Schroeder, Werner H.

Sewing

Elements

Tensioning

112 79A, 112220, 74194, D05B 4704

Patent

active

043004652

ABSTRACT:
A thread-tension regulating device for multi-thread sewing machines comprises a speed change mechanism and a thread-tension regulating mechanism. The speed change mechanism has an infinite speed variator and pulleys for operating the variator. The thread-tension regulating mechanism comprises a cam shaft rotated by the speed change mechanism, cams fixed onto the cam shaft, operating rods reciprocated by the cams, pairs of tension discs mounted on the corresponding operating rods, and biasing elements for periodically imparting tension to threads which pass between the paired tension discs according to the reciprocating movement of the operating rods. By selecting the shape, dimension and angular phase differences of the cams, a biasing force between the paired tension discs, and the rotational speed of the cam shaft as given by the speed change mechanism, a variety of patterns can be formed on cloth by the multi-thread sewing machine.

REFERENCES:
patent: 485546 (1892-11-01), Hunt
patent: 670078 (1901-03-01), Humphrey
patent: 851082 (1907-04-01), Fischer
patent: 2158197 (1939-05-01), Pikul
patent: 2191046 (1940-02-01), Tiesler
patent: 2932339 (1960-04-01), Odenweller
patent: 3001388 (1961-09-01), MacCaffray
patent: 3348582 (1967-10-01), Brookshire
patent: 3356050 (1967-12-01), Urscheler
patent: 3835797 (1974-09-01), Franks et al.
patent: 3906876 (1975-09-01), Fitton

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