Sewing – Stitch forming – Shuttle type
Reexamination Certificate
2000-12-27
2002-02-19
Falik, Andy (Department: 3765)
Sewing
Stitch forming
Shuttle type
Reexamination Certificate
active
06347597
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a flat sewing device without thread bobbins, and especially to a flat sewing device used in a sewing machine.
BACKGROUND OF THE INVENTION
Referring to
FIG. 1
, the shuttle flat sewing device in the prior art is illustrated. The shuttle flat dewing device is installed on a sewing machine
50
. The shuttle receiving groove
503
is installed below the sewing portion
501
of the sewing machine
50
. A driving spindle
502
a
is installed at the center of the shuttle receiving groove
503
. The driving spindle
502
a
is connected to a shuttle casing
502
b.
The shuttle casing
502
b
is extended with a shuttle receiving cavity
503
. The shuttle casing
502
b
can be disposed in the shuttle receiving seat
502
. The center of the shuttle receiving cavity
503
is installed with an axial rod
504
. The edge of the axial rod
504
is installed with an annular groove
504
a.
The edge of the shuttle receiving cavity
503
is installed with a positioning notch
505
. A lateral side of the sewing portion
501
of the sewing machine
50
is installed with a notch
506
. Two sides of the notch
506
each are installed with a sliding track
507
. A cover
508
can slide in the sliding track
507
. A hollow shaft
61
extends from the interior of the shuttle
60
. The outer lateral side thereof is installed with a movable elastomer
62
and a positioning rod
63
. A press
64
extends from an outer edge of the shuttle
60
. A thread bobbin
70
is further installed within the shuttle
60
. A sewing thread
71
is wound around the interior of the thread bobbin
70
.
Referring to
FIGS. 1 and 2
, as the sewing machine
50
is to be assembled, at first, the sewing thread
71
is wound around the thread bobbin
70
. At the press
64
, at the outer edge of the shuttle
60
, the sewing thread protrudes out from the thread bobbin
70
. The thread bobbin
70
is placed within the shuttle so that the central hole of the thread bobbin
70
is movably installed on the hollow shaft
61
in the shuttle
60
. Then, the positioning rod
63
at the outer surface of the shuttle
760
is aligned with the notch
505
at an upper edge of the shuttle receiving cavity
503
in the shuttle receiving seat
502
. Next, the shuttle
60
is installed in the shuttle receiving cavity
503
of the sewing machine
50
so that the hollow shaft
61
within the shuttle
60
is successfully installed in the shuttle receiving cavity
503
of the sewing machine
50
. Then, the shuttle
60
is connected to an axial rod
504
at a center of the shuttle receiving cavity
503
. The shuttle casing
502
b
is then connected to the driving spindle
502
a
at the center of the shuttle receiving seat
502
. Finally, the cover
508
slides into the sliding tracks
507
at two sides of the notch
506
of the sewing machine
50
.
However, since the length of the sewing thread
71
in the thread bobbin
70
is finite, the sewing length of the sewing thread
71
is equally finite. The sewing thread
70
must be replenished frequently for supplementing the sewing thread
71
in the thread bobbin
70
. After the sewing thread
71
in the thread bobbin
70
is used up, in the sewing machine
50
, the sewing thread
71
cannot be replenished immediately. The main thread of the sewing machine
50
will catch and break, and thus the thread must be rearranged at once. As a result, the efficiency of the sewing machine
50
is affected.
Moreover, since them material of the thread bobbin
70
is usually iron, and the sewing speed of the sewing machine
50
is very quick, the thread bobbin
70
is easily heated to a high temperature. When replenishing or supplementing the sewing thread
71
in the thread bobbin
70
, the user must touch the thread bobbin
70
and may thereby be burned.
Moreover, since the thread bobbin
70
is easily heated to a high temperature, the worker generally wears gloves, but working under that condition is inconvenient.
SUMMARY OF THE INVENTION
Accordingly, the primary object of the present invention is to provide a flat sewing device without thread bobbins which is used with a large sewing thread supply, so as to increase the sewing length of the sewing machine. The sewing thread in a large spool need not be replenished frequently. The main thread of the sewing machine will not break frequently. Harm from burns is avoided since the worker does not have to touch a hot thread bobbin. Another object of the present invention is to provide a flat sewing device without thread bobbins.
To achieve these objects, the present invention provides a flat sewing device without thread bobbins. Therefore, it is unnecessary for a worker to touch a hot thread bobbin. The convenience of working with the present invention is an improvement as a worker need not wear a glove.
In order to achieve the aforesaid objects, the present invention provides a flat sewing device without thread bobbins comprising: a dynamic seat having screw holes at a front face thereof, and a driving spindle being installed at a lower edge near a center thereof; an oblong case having two inner sides each extending with a flange and being fixed to a front face of the dynamic seat by screws; an auxiliary seat, gears, spindle, rotary bearings, a hollow spindle, a hollow driving spindle, which are properly connected; and a shuttle casing extending with a receiving cavity. The thread is not frequently broken. The work of changing color can be accomplished successfully. It is unnecessary to detach the shuttle or other elements. The problems of replenishing and supplementing the sewing thread are removed by the present invention, it is unnecessary to frequently replenish the sewing thread. Thus, the performance of the sewing machine is improved.
The various objects and advantages of the present invention will be more readily understood from the following detailed description when read in conjunction with the appended drawings.
REFERENCES:
patent: 1119561 (1914-12-01), Zahn
patent: 3066624 (1962-12-01), Jeppner
patent: 5199365 (1993-04-01), Arnold
patent: 5842431 (1998-12-01), Wu
Falik Andy
Rosenberg , Klein & Lee
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