Button hole sewing device

Details Button hole sewing device Button hole sewing device

1985-06-18

1986-11-18

Nerbun, Peter

Sewing

Stitch forming

Zigzag

D05B 306

Patent

active

046229108

ABSTRACT:
The button hole presser foot engages longitudinally slidably in a frame like slide which is taken along with the sewing material. The slide comprises a cord stretched in the longitudinal direction which encircles the lower end of a shaft of the presser foot shank. At the top end of the shaft is provided an impeller through which a light beam of a light source emerges toward a optoelectric transducer. During the sewing operation the slide moves with the sewing material and it drives the impeller which generates pulses each corresponding to a step of the motion of the sewing material, respectively of the slide. For determining the length of the cords, a determined number of steps, respectively of pulses is counted each time. This permits a reliable and precise determination of the length of the cords.

REFERENCES:
patent: 3596618 (1971-08-01), Goldbach et al.
patent: 3654882 (1972-04-01), Kamena
patent: 4019449 (1977-04-01), Hauf
patent: 4393797 (1983-07-01), Marsh
patent: 4458612 (1984-07-01), Asai et al.

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