Sewing – Special machines – Darning
Patent
1992-05-06
1994-01-25
Nerbun, Peter
Sewing
Special machines
Darning
11212127, 112318, D05B 1900, D05B 2710
Patent
active
052807584
ABSTRACT:
In an automatic sewing machine for sewing bands onto fabric parts, a metering device (3) which meters the band is electronically coupled to the sewing machine via a position sensor (6) in the form of a pulse generator, a signal processing circuit (8) and a motor, for example a stepping motor (SM). The amount of band per unit time delivered by the metering device depends on the speed. On the other hand, the stitch length of the sewing machine is, however, not independent of the speed but becomes greater with increasing speed. The resulting, undesired tensions between the fabric part on the one hand and the band on the other hand are avoided by a correction means (10) between the pulse generator (6) and the sewing machine (2) and the driver circuit (12) of the stepping motor (SM) of the metering device (3). The correction device ensures that control signals reaching the driver circuit (12) result in corrected, excessive metering of the band at higher sewing machine speeds. This correction is possible not only in the case of bands but generally for elements which, depending on the speed of the machine drive, are transported relative to the pressure foot.
REFERENCES:
patent: 4462326 (1984-07-01), Perego et al.
patent: 4922843 (1990-05-01), Hyca
Farber Martin A.
Nerbun Peter
Schips AG Nahautomationen
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