Needle-changing mechanism for multiple-needle embroidery sewing

Details Needle-changing mechanism for multiple-needle embroidery sewing Needle-changing mechanism for multiple-needle embroidery sewing

1994-12-14

1996-10-15

Nerbun, Peter

Sewing

Special machines

Embroidering

112163, 11247004, D05C 1106

Patent

active

055643540

ABSTRACT:
A needle-changing mechanism for use in a multiple-needle embroidery sewing machine is disclosed for controlling the changing of a selected sewing needle to a working position on the sewing platform of the sewing machine. The needle-changing mechanism includes a sensing plate having a gap portion sandwiched between two solid side portions. The position of the gap portion is changed by moving the sensing plate according to which needle is currently selected as the working needle. A plurality of photo detectors equal in number to the number of the needles of the sewing machine are arranged at equal intervals along a straight line relative to the axial orientation of the sensing plate such that the gap portion and the side portions of the sensing plate cause the photo detectors to output a pattern of positioning signals. A controller, which receives and processes output signals from the photo detectors, is used to control the movement of the needles so that the desired needle is positioned as the working needle. Among the advantages of the present invention are that it requires only a single positioning signal for the changing and positioning of the needles; it is capable of restoring the position of the current working needle after a power failure that causes the working needle to be out of position; and it can be constructed without the use of gears so as to reduce cost and facilitate easy assemblage.

REFERENCES:
patent: 4754721 (1988-07-01), Skogward
patent: 5390613 (1995-02-01), Shibata

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