Drive device for a two-threaded chain-stitch buttonhole sewing m

Details Drive device for a two-threaded chain-stitch buttonhole sewing m Drive device for a two-threaded chain-stitch buttonhole sewing m

1984-10-17

1986-02-18

Hunter, H. Hampton

Sewing

Special machines

Buttonhole

112220, 112274, D05B 306, D05B 6910

Patent

active

045705550

ABSTRACT:
The disclosure concerns a drive device for a double thread chain-stitch buttonhole sewing machine. The machine has a first drive shaft for driving the sewing needle and for moving the cloth support plate for sewing. It has a separate worm shaft for moving the cloth support plate to the sewing position and also for operating a knife for cutting the buttonhole. A first respective electromagnetic clutch operates the sewing needle drive shaft, and a second respective electromagnetic clutch operates an intermediate shaft which then operates the worm shaft for operating the cloth support plate and knife operating shaft are provided. A drive shaft is connected with the armature part of the first electromagnetic clutch on the sewing needle driving shaft. That armature part is gear connected with an armature part of the second clutch on the intermediate shaft. Activation of the clutches controls which of the shafts operates, as the clutches include rotors which rotate with respect to their respective shafts or are clutched to cause rotation of the shafts.

REFERENCES:
patent: 2936727 (1960-05-01), Ashworth et al.
patent: 3563196 (1971-02-01), Nicolay
patent: 3585949 (1971-06-01), Chadner
Durkoppwerke GmbH, "Aufstellen der Durkopp 558-Installing Durkopp 558", 11/81.

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