Sewing – Work manipulating – Guides
Patent
1978-03-23
1980-01-29
Nerbun, Peter
Sewing
Work manipulating
Guides
D05B 302
Patent
active
041855728
ABSTRACT:
A sewing machine is disclosed wherein positioning of the needle is controlled by an actuator mechanism responsive to digital stitch pattern signals applied thereto. The actuator mechanism includes four solenoids selectively energized by the digital stitch pattern signals. The four solenoids are chosen to have particular binary-related axial displacements and are mounted in such a manner that a doubly pivoted lever driven by the solenoids provides a displacement at one end thereof which is additive of the selected solenoid energization. This one end of the lever shifts a bar that has an opening into which the periphery of a first cam extends. This first cam is axially free on the arm shaft of the sewing machine but is keyed to rotate with it. A yoke spans the cam and is restrained from rotating, but is moved axially by the cam. The yoke is operatively connected to laterally position the needle bar. A bar restraining brake is actuated by a second cam on the arm shaft and is timed to release when the solenoids are shifting the lever. The brake restrains the bar when the first cam is driving the yoke so as to position the needle bar, thereby utilizing the power of the sewing machine main motor.
REFERENCES:
patent: 4074641 (1978-02-01), Tholander et al.
patent: 4086861 (1978-05-01), Ketterer et al.
Bell Edward L.
Davis David L.
Nerbun Peter
Smith Robert E.
The Singer Company
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