Note: Descriptions are shown in the official language in which they were submitted.
1~98379
This invention relates to a sewing machine for sewing
pieces of cloth.
When pieces of cloth are sewn together to make
clothing, it is necessary, even in the making of a single article
of clothing, to select the way of sewing suitable for a variety
of sewing types. That is, for example, when an edge of a
piece of cloth is stitched, overedge stitching is employed,
and on the other hand, when a plurality of pieces of fabric are
sewn together, lockstitching is employed. Because of such
stitching requirements, if two sewing machines, one for the
lockstitching and the other for the overedge stitching, have
~o be accommodated for example in an ordinary household, it
poses a problem that these machines occupy a very large space
when they are put in a house-work room.
In addition, when articles of clothing are made in
a household, there is often involved the procedure of applying
the overedge stitching to a first portion, thereof, thereafter
the lockstitching to a second portion, and the overedge stitching
to a third portion, and thereafter again the lockstitching
thereto. In such case, if an attempt i made to perform sewing
using two different sewing machines, the operation, in which
an operator leaves one seat and takes the other seat w~ere sewing
takes place and thereafter the operator returns to the first
seat for sewing, must be repetitiously conducted.
It is therefore an object of the present invention to
provide a sewing machine in which two modes of sewing, one
for lockstitching and the other for overedge stitching can be
achieved by a single sewing machine.
It is a further object of the present invention to
provide a sewing machine in which even in the case where the
two modes of sewing as described above are alternately carried
out, either way of sewing may be immediately conducted by only
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a slight movement of hand.
It is another ob~ect of the present invention to
provide a sewing machine of a compact style externally similar
to conventional sewing machines which can merely perform a
single way of sewing, despite the fact that the proposed sewing
machine may perform two modes of sewing as previously mentioned.
In accordance with the above objects, the invention
as herein claimed lies essentially in a sewing machine having
a body including: a bed; a support extending upwardly from
one end of said bed and an arm frame extending at one end from
the upper end of said upright support over and parallel to said
bed whereby said body is ~shaped with the free end of said arm
lying above the free end of said bed; a lockstitching mechanism
including an upper lockstitching means depending from said free
end of said arm frame and a lower lockstitching means in said
free end of said bed, the improvement in the combination there-
with comprising:
means defining a recess in said support at the inner
end of said ~shape, said recess opening inwardly of said ~shape
toward the free ends of said bed and of said arm frame and
extending across said bed; said recess having a top wall facing
said bed, and
an overedge stitching mechanism including an overedge
stitching needle movable up and down from said recess upper
wall and a looper proiecting upwardly from said bed to cooperate
with said overedge stitching needle within said recess and ~eing
lodged therein.
Other objects and advantages of the invention will
become apparent during the following description of preferred
3~ embodiments haviny reference to the appended drawings wherein:
Figure 1 is a front view, partly in section, of a
sewing machine, according to a first embodiment of the invention;
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Figure 2 is a side view on the right side;
Figure 3 is a longitudinal sectional view of a
selecting mechanism;
Figure 4 is a front view showing the state of the
sewing machine in the case of overedge stitching;
Figure S is a side view on the left side, partly
in section, showing the state similar to that of Figure 4;
Figure 6 is a plan view showing the state where
lockstitching and overedge stitching are alternately carried
out;
Figure 7 is an exploded perspective view showing
another embodiment;
Figure 8 is a front view, partly in section, showing
the state where the overedge stitching is carried out by the
sewing machine shown in Figure 7;
Figure 9 is a perspective view of a cloth holding
section;
Figure 10 is a perspective view of a cover for
covering an overedge stitching mechanism;
Figure 11 is a front view showing the state where the
overedge stitching mechanism is covered with the cover; and
~igure 12 is a front view showing the state where
an upper mechanism in a lockstitching mechanism is covered
by a cover.
Referrlng now to Fig~res 1 through 6, the reference
numeral 10 designates a machine frame of the entire sewing
machine. This machine frame 10 comprises a bed 11, an upright
support 12 uprightly extending from the bed 11, and an arm frame
13 extended parallel with the upper surface of the bed 11 from
3~ the upper end of the upright support 12. The arm frame 13
comprises an arm frame body 14 integral with the upright sup-
port 12 and a head 1~ connected to the foremost end of the arm
lQ~8379
frame body 14. The head 15 is rotatably mounted on the arm
frame body 14. That is, the arm frame body 14 is formed at its
foremost end with a bearing hole 16 whereas the head 15 has
a shank 17, which is rotatably received in the bearing hole 16.
In a connection between the arm frame body 14 and the head
15, the arm frame body 14 has a projection 18 extended there-
from, (Figùre 4), which projection 18 threadedly receives an
adjusting screw 19. On the other hand, the head 15 has a stop
20 attached thereto. When the stop 20 bears on the tip of the
adjusting screw 19, a needle in the lockstitching mechanism
later described herein is properly opposed to a shuttle also
later described herein. It should be noted that the arm frame
body 14 is provided with a fastening handle 21 used to lock the
head 15 which is in turn provided with a handle 22 for rotation
and operation thereof.
Next, a lockstitching mechanism 24 will be described.
The lockstitching mechanism 24 comprises an upper mechanism
25 disposed in the head 15 and a lower mechanism 26 disposed
interiorly of the bed 11. These are constructed similarly to a
conventional sewing machine. Namely, in the upper mechanism
25, an arm shaft 28 for lockstitching is inserted in a hole 27
bored in a central position of the shank 17, and a thread take-
up cam 29 is mounted on one end of the arm shaft 28, The cam
29 has a thread take-up lever 30 connected thereto. The head
15 has a needle bar 31, with a needle 33 attached to a lower
end thereof, mounted thereon and movable up and down. The needle
bar is connected to the cam 29 through a needle-bar connectin~
link 32. The head 15 is provided with a presser bar 34 movable
up and down, the presser bar 34 having a presser foot 35 attached
to a lower end thereof. The head 15 further has a thread tension
regulator 36 mounted on the outer surface thereof. In the lower
mechanism 26, a shuttle 37 is positioned below the needle bar
lQ~83~9
31 in the upper mechanism 25. The shuttle 37 has a shuttle
driving mechanism 38 connected thereto, which in turn has an
oscillating driving shaft 39 connected thereto. The driving
shaft 39 is connected to the arm shaft 38 through connecting
rods 40 and 41. Accordingly, when the arm shaft 28 rotates, the
needle bar 31 moves up and down and the shuttle 37 also turns
in association therewith, whereby a needle thread passed through
the needle 33 cooperates with a bobbin thread within the shuttle
37 to effect lockstitching of clothes.
An overedge stitching mechanism 44 will now be
described. It is here pointed out that, as clearly shown in
Figures 1, 4, 5, 7 and 8, the operative parts of this overedge
stitching mechanism are lodged within a recess in the upright
support 12 at the inner end of the ~shape made by the bed 11,
the upright support 12 and the arm frame 13, this recess opening
inwardly of the ~shape toward the lockstitching mechanism 24
and extending across the bed 11. This overedge stitching
mechanism 44 is aiso constructed similarly to a mechanism of a
conventional overedge stitching machine. That is, the upright
support 12 is interiorly provided with an overedge stitching
spindle 45 which is laterally supported in side wall 12a and
a bearing member 46. A rotary plate 47 is mounted on one end of
the spindle 45 and one end of a crank rod 48 is pivotally mounted
at an eccentric position of the rotary plate 47. The crank
rod 48 has the other end connected to a needle bar 49 which
is supported movably up and down on supporting mem~ers 50 and
51. Thus, when the spindle 45 rotaies, the needle bar 49 moves
up and down in association therewith. It will be noted that a
needle 52 is attached to the lower end of the needle bar 49.
An eccentric 55 is secured to the spindle 45 and an
annular member 56 fits in an outer peripheral surface of the
eccentric 55. A suspending rod 57 is integrally connected to
-5-
lQ~a83, 9
the annular member 56. A transmission rod 58 connected to
the lower end of the rod 57 extends externally of the upright
support 12 passing through a slot 59 bored through a side wall
12c in the form of a concavity in the upright support 12 and
is connected to a midportion of an oscillatory arm 60 having
one end pivotally mounted on the side wall 12c. The ocscillatory
arm 60 has a cloth cutting edge 61 attached to the other end
thereof.
With this construction, when the spindle 45 rotates,
the oscillatory arm 60 is oscillated up and down through the rod
57 so that the article of clothing cutting edge 61 may cut an
edge of clothes to be overedge stitched.
Also, an eccentric 64 is secured to the spindle 45
and an annular member 65 fits in an outer peripheral surface
of the eccentric 64. A suspending rod 66 is integrally con-
nected to the annular member 65. The rod 66 has its lower end
connected to a looper driving member 67 so that when the spindle
45 rotates to move the rod 66 up and down, the looper driving
member 67 is actuated and a looper 68 is then operated in as-
sociation therewith.
Further, a triangular cam 69 is secured to the spindle45. An upper end of a bifurcated rod 70 is opposedly close to
the triangular cam 69. A lower end of the bifurcated rod 70 is
brought into association, in a known manner, with a feed dog
73 exposed at the upper surface of the bed 11, through a le~er
71, a shaft 72 and the like. Accordingly, when the spindle
45 rotates to cause the needle bar 49, the cloth cutting
edge 61 and the looper 68 to actuate, the feed dog 73 is a~so
associated therewith to effect the cloth feeding operation. It
will be noted that a feed-amount setter 74 is connected to
a midportion of the bifurcated rod 70 so that the amount of
feeding of cloth by the cloth feed dog 73 may be adjusted by
1~a83~9
operation of a lever 75.
Next, a selecting mechanism 77 is provided on the
side wall 12a of the upright support 12. The aforementioned
lockstitching arm shaft 28 and the overedge stitching spindle
45 are designed to be interlocked with a motor 88, (Figure 2)
which serves as a driving device, through the selecting mechanism
77. This selecting mechanism is principally shown in Figures 1
and 3. That is, pulleys 78 and 79 fit in the shaft 28 and
spindle 45, respectively, so that the former may be freely
rotated with respect to the shaft 28 and spindle 45, respectively,
but may not be moved in an axial direction. Clutch members 80
and 81 are connected to the ends of shaft 28a and spindle 45a,
respectively, in splined manner so that the former may be
rotated integral with the spindlers, respect1vely, and may be
moved in an axial direction. Mutually opposed surfaces in the
pulleys 78 and 79 and the clutch members 80 and 81, respectively,
are formed with a pair of concave portions 82 and 83 and raised
p~rtions 84 and 85 adapted to be fitted or disengaged from each
other. Accordingly, when the raised portion 84 is fitted
in the concave portion 82, the pulley 78 and shaft 28 integrally
rotate, and when the raised portion 85 is fitted in the concave
portion 83, the pulley 79 and spindle 45 integrally rotate. In
order to be driven by the motor 88, the pulleys 78 and 79 are
connected with a pulley 89 mounted on a rotary shaft of the motor
88 by belts 86 and 87. It will be noted that the motor 88 is
mounted on the back of the upright support 12 through a bracket
90 .
In the operation of lockstitching of clothes using
the sewing machine as constructed above, the selecting mechanism
77 may be operated so that rotation of the motor 88 is trans-
mitted only to the arm shaft 28 for lockstitching. The head
15 is placed to assume a position as shown in Figure 1 with
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respect to the arm frame body 14 and secured by the fastening
handle 21. When the motor 88 is rotated in a state as described
above, the lockstitching work for clothes may be accomplished
by the lockstitch mechanism 24 entirely similarly to a con-
ventional lockstitch sewing machine and in a state as indicated
by full line in Figure 6.
Next, in the operation of overedge stitching of clothes,
the selecting mechanism 77 may be operated so that rotation of
the motor 88 is transmitted only to the spindle 45 for overedge
stitching. The head 15 is placed to assume a position as shown
in Figure 5 with respect to the arm frame body 14 and secured
by the fastening handle 21. When the motor 88 is rotated in
a state as described above, the ~veredge stitching work for
clothes may be accomplished by the overedge stitching mechanism
44 entirely similarly to a conventional overedge sewing machine
and in a state as indicated by phantom line. In this case, even
if the upper mechanism 25 in the lockstitch mechanism 24 is
disposed at the foremost end of the arm frame 13, it is positioned
greatly withdrawn from the upper surface of the bed 11 as shown
in Figure 5. Hence, the upper mechanism 25 will not stand in
the way of clothes 91 to be overedge stitched as shown in
Figure 4. This facilitates the overedge stitching work.
It should be appreciated that in alternately carry-
ing out the lockstitching work and overedge stitching as
previously mentioned, the loc~stitching mechanism 24 and the
overedge stitching mechanism 44 are positioned with respect
to the machine frame 10 as previously mentioned in the present
sewing machine, so that either way of sewing may be initiated
immediately only by slight movement of hand as shown in Fig. 6.
A~so, in this case, either sewing mechanism 24 or
44 alone may be moved by means of the selectin~ mechanism 77.
Accordingly, the motor 8~ may ~e o~ comparatively low power.
~Q~8379 ~
Further, there is prevention of accidents involved in a case,
for ~xample, where clothes to be lockstitched erroneously get
entangled in the overedge stitching mechanism 44 during the
operation of lockstitching sewing.
Moreover, since the upright support 12 is interposed
between the lockstitch mechanism 24 and overedge stitching
mechanism 44, which are positioned to left of the upright 6Up-
port 12, and the selecting mechanism 77, which is positioned
opposite thereto, clothes may be moved by the left hand and at
the same time, the selecting mechanism 77 may be operated by the
right hand, during the operation as mentioned above.
Figures 7 and 8 illustrate a different embodiment.
The sewing machines shown in these figures are so designed
that an upright support 12e is provided separately from an arm
frame 13e, both being connected by a bolt 110 as a connecting
member.
A bed lle is de~igned in the form of an elongated
structure and being raised from a base 111 so that the sleeves
of a coat may be conveniently sewn.
In addition, in the selecting mechanism 77e, a belt
87e used to rotate a pulley 79e is passed over a pulley 112
sec~red to a pulley 78e.
In such sewing machines wherein the upright support
12e is separated from the arm frame 13e, it is possible to
easily perform machining of a hole for supporting a needle bar
49e in an overedge stitching mechanism 44e, machining a hole
for supporting a spindle 45e for overedge stitching, machining
a hole for carrying a ~ase of a looper 68e or work for affixing
various parts to these holes.
Those parts in sewing machines shown in Figures 7
and 8 considered to have identical or e~ual constructions in
terms of function to those sewing machines shown in Fgirues 1
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3379
through 6 are indicated by reference numerals with a suffix
e added thereto to avoid the need of duplicated description.
Next, Figure 9 shows a detailed construction of a
presser foot in the overedge stitching mechanism 44e of the
sewing machine shown in Figure 8. A shaft 113 supported on
an upright support 12ce is normally biased by a spring 114
shown in Figure 8 in a direction as indicated by the arrow 116.
The shaft 113 may be rotated in a direction as indicated by
the arrow 117 by means of a handle 115 mounted on one end
thereof. The shaft 113 has a bracket 118 secured to the other
end thereof, and a holder member 119 for holding a presser foot
54e is pivotally mounted on the bracket 118 by a pin 120. The
aforesaid pivotal position is displaced from a center line 122
of the presser foot 54e through a distance as indicated at W.
The abovementioned construction, in which the presser
foot 54e is supported, allows the presser foot 54e, when a
thread is passed through a needle 52e shown in Figure 8, to be
moved in a direction as indicated by the arrow 123, thus facili-
tating work of passing a thread through a needle.
Further, where the presser foot 54e is then returned
to a position as shown in Figure 9 for sewing of clothes, when
the clothes are fed in a direction as indicated by the arrow
124, the presser foot 54e is always maintained in a position as
shown by the presence of the a~oresaid distance W.
Figure 10 shows a cover 125 for covering the overedge
stitching mechanism. In the operation of lockstitching, the
cover 125 covers up the overedge stitching mechanism as shown
in Figure 11 to prevent clothes from being entangled in the
needle or other parts in the overedge stitching mechanism.
The cover 125 may be attached to the upright support by placing
a magnet 126 affixed to the cover 125 on the upright support
or other suitable stop means.
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10~83~9
Finally, Figure 12 shows a state where the upper
mechanism in the overlock stitching mechanism is covered up
by a cover 127. In the operation of the overedge stitching,
the upper mechanism may be covered up by the cover 127 as just
mentioned to thereby prevent clothes from being entangled in the
needle in the upper mechanism or other parts. It should be
noted that the cover 127 may be mounted in a manner similar to
that is accomplished when the cover 125 is mounted.
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