Sewing – Stitch forming – Bobbin ejector
Patent
1975-05-09
1976-09-21
Schroeder, Werner H.
Sewing
Stitch forming
Bobbin ejector
D05B 5726
Patent
active
039812561
ABSTRACT:
The present invention is an automatic bobbin changer for sewing machines of the lock stitch type having bobbin holders with holder pins and latches. A magazine of full bobbins and cases is positioned adjacent the sewing machine, and a cross slide is provided which is movable from a first position to a second. This slide is provided with two powerful magnets, preferably permanent magnets, which are spaced on the slide so that in one position one magnet is aligned with the sewing machine bobbin holder and the second is aligned with the full bobbin magazine. The two magnets are provided with actuators, preferably fluid operated actuators, which can move the magnets forward so that they contact, respectively, an empty casing in the sewing machine bobbin holder and a full bobbin and casing in the magazine. The two magnets then retract toward the slide and the slide moves to the second position. In the first position the magnet which is aligned with the empty bobbin in the sewing machine first moves forward and contacts the lid of the bobbin case. As it retracts, the lid of the bobbin case is first moved slightly to unlatch it. Above the magnet, which, in the first position of the slide, is opposite the sewing machine bobbin holder, there is provided a stripper plate attached to the slide and positioned to strip the bobbin case off from the magnet as the latter retracts. When the magnets have retracted, the slide is then moved to a second position by another fluid actuated device which brings the second magnet, having the full bobbin and case on its end, opposite the sewing machine bobbin holder, and the two magnets again move forward, pushing the full bobbin onto the sewing machine holder. The magnet is then retracted again toward the slide, leaving the full bobbin and case in the sewing machine bobbin holder. The slide then moves sideways so that the first magnet with its stripper plate is opposite the sewing machine bobbin holder, and the changing cycle is thus completed. The sewing machine starts up and proceeds until the full bobbin is again exhausted. The magazine of full bobbin cases may be of various designs. It may be a sleeve positioned at right angles to the slide with the full bobbins and cases axially aligned and urged forward by suitable spring or it may be of another type of magazine which brings sequentially full bobbins and cases opposite the magnet.
REFERENCES:
patent: 2733676 (1956-02-01), Schumann et al.
patent: 3376848 (1968-04-01), Schiffmacher et al.
patent: 3744442 (1973-07-01), Michaels et al.
patent: 3747547 (1973-07-01), Mayer et al.
Cohen Moshe I.
Frimer Michael T.
J. P. Stevens & Co., Inc.
Leitner Saul
Norton Robert Ames
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