Sewing – Elements – Thread sensing
Patent
1988-02-02
1989-02-21
Nerbun, Peter
Sewing
Elements
Thread sensing
112231, 112273, D05B 4500
Patent
active
048055441
ABSTRACT:
A sewing machine having a thread monitor associated with a bobbin mounted for rotation. The bobbin includes first and second reflecting surfaces associated with an inner side of a second bobbin flange, and first and second light outlet openings associated with a second bobbin flange. A light source is provided for directing light toward the reflecting surfaces. A light receiver is positioned so as to receive light emerging from the first and second outlet opening. The light receiver produces signals representing the light intensity received by the light receiver. A Schmitt trigger provides a pulse to a microprocessor coinciding with a revolution of the bobbin. For each revolution of the bobbin, an A/D converter converts signals received from the light receiver into digital signals which are compared. The digital signal having the maximum value for the revolution is stored in a memory and then compared with a subsequent maximum value. When the subsequent maximum value differs from the stored maximum value, a warning signal is generated by the microprocessor.
REFERENCES:
patent: 4693196 (1987-09-01), Hager
patent: 4732098 (1988-03-01), Mertel et al.
Dobner Reinhold
Mertel Bernhard
Willenbacher Erich
Nerbun Peter
Pfaff Industriemaschinen GmbH
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