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Патент USA US3089454

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May 14,, 1963
J. FORSTER ETAL
3,089,444
ZIG-ZAG SEWING MACHINES
3 Sheets-Sheet 1
Filed Aug. 4, 1959
8
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12.9
INVENTORS
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Juan FqRs rm
ERIC/l GRU/VKE
/4/
BY
Md’ ywk/
ATTORNEYS
ice
United States Patent
3,089,444
Patented May 14, 1963
2
3,089,444
ZlG-ZAG SEWKNG MACHENES
Jakob Forster and Erich Griinke, Hinwil, Switzerland
Filed Aug. 4, 1959, Ser. No. 831,612
Claims priority, application Switzerland Nov. 30, 1954
12 Claims. (Cl. 112-159)
This invention relates, in general, to a zig-zag sewing
machine, and in particular, to a sewing machine having
a needlebar adapted to move about a swinging axle and
laterally to the direction of advance of the fabric and like
Means for effecting the displacement of the swinging
axle consists preferably in rockably mounting the hori
zontally disposed swinging axle of the needle bar frame
on a carrier rod which is mounted in bearings and is slid
able in axial direction thereof.
In the machine according to the present invention, the
term “swinging axle,” ‘as used in the speci?cation and
claims, includes rotating axles or pivots in vertical and
horizontal directions, while oscillatory axles are also to
be comprised by this term, as well as other ‘forms of the
same.
Yet a further object of the present invention resides in
the provision of means facilitating a positive regulation
of the overstitch widths and of the needle displacements
material, means being provided for the automatic control
of the zig-zag overstitch width and of the stitch ?eld posi 15 or movements within lateral con?nes of said widths.
These and other objects of the invention will become
tion, together with means for moving the loop taker
further apparent from the following detailed description,
sideways.
reference being made to the accompanying ‘drawings show
This application is a continuation-in-part of U5. appli
ing
preferred embodiments of the invention.
cation Serial No. 549,785 ?led November 29, 1955, now
FIGS. 1 and 2 show diagrammatically the construction
20
Patent No. 3,020,865, granted February 13, 1962.
In a knovm zig-zag sewing machine of the aforesaid
type an angular twisting of the needlebar frame occurs
about a vertical pivot axis which itself is ?xed in position.
This angular twisting of the needlebar vframe has the
of a machine according to the present invention.
FIGS. 3 and 4 show various sewing patterns that can be
produced with this machine.
FIGS. 5 and 6 show a loop taker drive in elevation and
serious disadvantage that, for larger de?ection values, the 25 in section, and
FIGS. 7 and 8 show another loop taker drive in two
decorative picture produced undergoes a highly undesir
sections.
able distortion. In addition, in this prior ‘art machine the
In FIGS. 1 and 2, which should be placed side by side,
zig-zag stitch line produced is arcuate.
the contour of the housing 100 of the machine is shown
One object of the present invention is to provide a zig
zag sewing machine in which provision is made for dis 30 diagrammatically in chain-dotted lines. Some parts of the
machine, the construction and functions of which are
placing laterally beyond itself, to the right and to the left,
the maximum zig-zag overstitch width which can be ob
known to those skilled in the art, are also shown in chain
dotted lines. These parts, which for the most part will not
be mentioned hereinbelow, are merely indicated, in order
needle can be displaced in a known manner within the 35 to facilitate the understanding of the construction and
mode of operation of the machine.
lateral limits of these widths, as such and additionally to
The main shaft 101, which is mounted in the usual man
the aforesaid movements, for example starting from their
ner in the machine housing 100, is also mounted in a
limits. This cannot be achieved with prior art zig-zag
horizontally slidable housing 102, which contains a con
sewing machines, or at least cannot be achieved without
a highly undesirable distortion being so great that a 40 ventional mechanism for obtaining the zig-zag overst-itch
size and a conventional mechanism for the adjustment
satisfactory solution of the problem is out of the question.
of the stitch ?eld position. These mechanisms do not
A prior ‘art machine has been disclosed in which the
require detailed explanation. It is essential that the
entire machine head can ‘be displaced sideways, but with
housing 102 containing these mechanisms should be hori
this machine only simple zig-zag stitches can be produced
45 zontally reciprocable in accordance with the double arrow
and the problem considered here did not arise at all.
103 (FIG. ‘2), as will hereinafter be explained in detail.
In order to achieve the purpose of the present invention
A horizontal rod 104, rigidly secured to the slidable
and in particular in order to avoid the aforesaid disad
housing 102, is mounted in the machine housing 100 by
vantages of a distorted sewing pattern, it is another object
means of the diagrammatically illustrated bearings 105
of the present invention to provide a machine having
and 106.
means for obtaining the displacing of the swinging axle
The needlebar frame 108, in which the needlebar 109
and means for obtaining the lateral displacement of the
tained with the machine and within which the zigzag
overstitch can be produced in various widths and the
loop taker, together with the lateral displacement of the
is vertically reciprocated in known manner, is swingably
swinging axle or pivot.
mounted on a swinging axle 107 fastened to the rod 104,
‘In particular, the displacement of the swinging pivot
while the needle clamp 110, the needle 111, and fastening
or axle, and also the means for the lateral displacement of
screw 112 for the needle participate in this movement.
tion to provide means ensuring the solution of the problem
described above and eifectuating the production of com
pletely faultless decorative stitch patterns, which may, for
in order to be able to horizontally reciprocate the
mechanism housing 102 in the direction of the double ar
row 103, it is jointed at 115 at the top (FIG. 2) on a beam
On the lower part of the needlebar frame 108, one end
the loop taker together with the lateral displacement of
of the known zig-zag de?ecting bar 114 is mounted at
the swinging axle, ensure during the performance of these
113, while its other end is driven for the purpose of
movements the lateral displacement of the maximum zig
producing the zig-zag de?ection by a swinging part (not
zag overstitch width beyond itself.
Consequently, it is another object of the present inven 60 shown) which is disposed in the housing 10-2.
example, also be of decisive importance in monogram 65 116, which extends substantially in vertical direction and
on which, at approximately half-way up its height, a
embroidery.
'
3,089,444.
3
4
horizontal pin 117 is rigidly secured, said pin being guided
ures. The sole difference is that the loop taker 128, which
horizontally in the guide 118 provided on the machine
is not shown in greater detail, has a vertical axis 87".
housing 100. The beam 116 is jointed at .119 to a link
In both cases the taker axis 87' and 87", respectively, is
perpendicular to the drive shaft 129 of the loop taker.
120, which in turn is pivotally connected at 121 to the
bottom end of a rocking lever 123 rockable about the U! Takers of this type have hitherto only been made sta
?xed pivot point 122. This rocking lever 123 carries a
tionary. The takers of the type illustrated in FIGS. 5
feeler ?nger 124 in contact with the control cam 125.
to 8 are used with great advantage in the sewing machine
When the feeler ?nger 124, which is biased by a spring
described above.
The housing 141 of the loop taker 128 illustrated in
(not shown), follows the control cam 125, the link 120
performs a substantially horizontal movement in the di 10 FIG. 1 is provided with guide bolts 142, 143, which are
guided in bearings '144, 145 provided in the machine
rection of the double arrow 126, and this movement is
transmitted to the cam disc mechanism containing hous
housing 100. The guide bolt 143 is screwed fast to the
ing 102 and through rod 104, which is horizontally re
block 146, which is mounted on the loop taker drive shaft
ciprocable in the direction of arrows 104A to the swing
129 between two securing rings 147 and consequently
must participate in the lateral displacement of the shaft
ing axle or pivot 107 of the needlebar frame 108, whereby
the stitch ?eld is displaced.
129, as shown by arrow 143A. The securing rings 147
are joined fast to the shaft 129 and participate in the
Cam ‘125 which has a clutch 149 may be rotated step
by step, for example from the main drive shaft 101 via ec
rotating and also in the reciprocating movement of the
centric 160 and oscillating connecting rod 151. If de
latter.
From the above description it is clear that the loop
sired, the connecting rod 151 may be adjusted to provide
no oscillation and cam arrangement 125, 149 may be
taker .128, the shaft of which crosses perpendicularly the
manually operated.
loop taker drive shaft 129, and the needle 111 receive a
The zig-zag overstitch width is not dependent on this
displacement jointly derived from the control cam 125.
displacement of the stitch ?eld, and for any stitch ?eld
Referring to FIG. 2 it will be noted that hollow shaft
position any desired overstitch width can be adjusted up
148 on which the control cam 125, or a whole set of con
to the maximum overstitch width dictated by known
trol cams, is mounted, a switching pin 149 is coaxially
mechanism. The reciprocating movement in the direction
arranged which is pivotally mounted on the machine
of the double arrow 126 is also transmitted from the
casing 100 and is ?xedly connected to a lever 150 on
which a connecting rod 151 is articulated. To this con
lowermost juncture point 127 of the beam 116, as shown
by arrows 127A, to the loop taker 128, which is repre 30 necting rod a vertical up and down motion is imparted
sented diagrammatically by a circle and which is thus
in a manner whereby the stroke thereof can be freely se
displaced in the same manner as the stitch ?eld position
lected within certain limits.
of the needlebar.
The switching pin 149‘ is provided at its circumference
The beam 116 is jointed at ‘127 to a bushing 130 which
with three recesses 152 designed as guides for rollers,
is rotatable on the loop taker drive shaft 129 and which
wherein for example three clamping rollers 153 are ar
is disposed between two adjusting rings 131 fastened on
ranged. When the pin 149 is turned in the anticlockwise
the shaft 129.
direction, the clamping rollers 153 jam between the wedge
The taker drive shaft 129 is mounted in the bearings
face 154 and the inner Wall surface of the hollow shaft
132, 133, and 1134- provided on the machine housing 100
148 so that the latter is compelled to partake in the rota
and is driven through gears 135 and 136. The gear 135 210 tional movement of the pin. In the subsequent rotational
is mounted on a shaft 137 which is driven by means of
movement of the pin in the clockwise direction the jam
a transmission pulley 138 and a transmission belt 139
ming is released in that the rollers come to lie freely ro
from the main shaft 101.
tatably on the surfaces 155 of the recesses 152. Upon
The gear 136 is mounted so as to be axially lightly slid
movement of the connecting rod 151 accordingly the hol
able on the key 140, which connects it rotationally to the
low shaft 148 and the set of control cams mounted there
taker drive shaft 129 and on the axial displacement of the
on and turned onward stepwise. The larger the stroke of
shaft 129, is prevented from participating in this axial
rod 151 the faster is the movement of the cams 125.
displacement by stops (not shown) in the form of rollers.
It may be also mentioned that the stepwise feed of the
The loop taker 128 corresponds substantially to that
set of control cams takes place at the moment when the
illustrated in FIGS. 5 and 6. FIGS. 5 and 6 show in 50 needle is outside the fabric, whereas the return stroke of
elevation and section, respectively, a loop taker 128 hav
the parts or components 149 to 151 takes place in the
ing an axis oriented in the direction of sewing. The ro
moment when the needle is in the fabric for the formation
of the stitch.
tating loop taker drive shaft 129, which corresponds to
the drive shaft 129 in FIGS. 1 and 2, and which is axially
On the axle ‘156 a slider block ‘157 is mounted on
displaceable as shown by arrows 129A, enables the taker
which the guides 158 of the connecting rod 151 are
128 to participate in the movement extending trans
guided. In the upper portion of the connecting rod ‘151 a
versely to the direction of advance of the material. The
ring 159 is mounted having a spherical outer surface
bearing 75 of the loop taker shaft 87’ for the loop taker
which is ?tted on an eccentric 160 of variable effective ec
128 is fastened to the guide bolts 76 which are movable
centricity. The eccentric 160 has the shape of a cir
in the guide bushings 78 provided in the sewing machine
cular cylinder the end face of which is inclined to its
housing.
axis, and is ?xedly connected to a ?anged sleeve 161
A pair of spiral gears 79 transmits the rotary movement
which is slidably mounted on the main shaft 101 but is
from the loop taker drive shaft 129 to the loop taker
carried along by the same in rotation. A double lever
shaft 87’. A flap 81 and a retaining spring 82 ?tted there
163 pivoted at 162 on the machine housing 100 has at
to are likewise connected to the movable bearing 75.
its lower end (which is bifurcated in a manner not
The parts 75, 76, 79, 81, 82 and 128 are connected
shown) two dogs 164 (only one being shown) which en
through the block 83 to the taker drive shaft 129, the
gage an annular groove 165 from opposite sides of the
block 83 being held in position at its sides by two securing
sleeve 161. The upper arm of the lever 163 is designed
rings 85 mounted on the drive shaft 129 and therefore
as an adjustment dial sector 166 which is adjustable by
having to follow axial reciprocating movements 129A of 70 hand with respect to ?xed markings 167.
the shaft 129. The block 83 has a bearing 84, in which
In the position illustrated the effective eccentricity of
the shaft 129 performs its rotating movement.
the eccentric 160, namely the eccentricity at the location
The same description applies to FIGS. 7 and 8, in
of the ring ‘159, is very small. When the lever 163 is
which the parts and their movements correspond with
turned in anticlockwise direction, the eccentric is dis
those of FIGS. 5 and 6, as that relating to the latter ?g
placed to the right, on the main shaft 101, and thereby
3,089,444
the effective eccentricity is increased which has the con
sequence of an increased stroke of the connecting rod and
according of a quicker rotation of the control cams.
Since the main shaft ‘101 is connected in a known man
ner (not shown) to the feeder device for the cloth, the
pitch of the stitches always remains constant, while the
length of the decorative stitch pattern becomes larger, the
6
said main frame, said needle bar being pivotally con
nected to said axially slidable horizontal rod.
‘
3. 1In a zig-zag sewing machine according to claim 1,
wherein said last named means includes a beam con
nected to said needle reciprocating means and disposed
to displace said needle frame and said loop taker.
4. ‘In a zig-zag sewing machine according to claim 1,
wherein
said means to displace said needle frame pivot
slower the rotation of the control cams. Of course, it is
and said loop taker laterally includes oscillatable cam
not absolutely necessary to effect the formation of the
decorative pattern automatically with the aid of the con 10 means connected to said loop taker to displace said loop
taker, and adjustable drive means connecting said oscil
trol cams and alternatively, the control cams can be made
inoperative in any way——for example by adjustment of
latable cam means and said needle reciprocating means to
synchronize movements of said loop taker and said needle
frame in accordance with the movement of said needle
tive stitches manually.
reciprocating
means.
15
Instead of mounting the lever 150 on the switching pin
5. In a zig-zag sewing machine according to claim 4,
149, it may alternatively be mounted loosely rotatably on
wherein said needle reciprocating means includes a main
the shaft of the control cam i125, and a spring-biased pawl
drive shaft.
may be arranged at its free end.
6. In a zig-zag sewing machine according to claim 5,
On the shaft then a ratchet wheel would be mounted
wherein said oscillating cam drive means includes a tubu
which is moved on stepwise by the pawl always in the
lar member, a cam a?’ixed to said tubular member, a
same direction when the lever 3150 is turned to-and-fro,
switching pin inside said tubular member having at least
namely at any time one tooth, or two or more teeth, de
one substantially triangular recess de?ned therein between
pending on the amplitude of the oscillation. The elfect
its outer walls and the inner walls of said tubular member,
would be the same as with the regulator illustrated, the
and a cylindrical ball in said recess adapted to be wedged
25
switching pin i149 and the clamping or clutch means 152between the wall of said tubular member and said switch
155 obviously being dispensed with.
ing pin upon rotation in only one direction whereby to
The advantage of the machine consists in the solution
move said cam upon movement of said switching pin in
of the problem set forth above, namely of displacing the
said direction.
maximum overstitch width to the right and to the left
7. A zig-zag sewing machine including a main frame,
laterally beyond its limits, without the stitch pattern being
a rod axially slidably mounted on said main frame, a
the feeler 124--so as to control the formation of decora
thereby distorted, in a manner which would, for exam
ple, be unacceptable for monogram embroidery.
The
needle frame pivotally mounted on said rod, means to
swing said needle frame about its pivot on said rod, a
width of the working ?eld need not of course always be
needle reciprocatable within said needle frame, means (to
fully utilized during use, but it is also possible to work in 35 reciprocate said needle, a loop taker disposed below said
a narrower zone than would be possible per se in conse
needle to cooperate therewith, and synchronizing means
quence of the construction of the machine.
connected to said means to swing said needle frame, to
At this point it should be particularly stressed that it
said loop taker, to said needle reciprocating means and
is possible for the outermost lefthand and righthand
to said rod to displace said rod and the needle frame pivot
stitch ?eld positions also to be sewn in each case with 40 and said loop taker laterally together.
straight stitches or zig-zag stitches of small overstitch
width, as can be done with the zig-zag stitch of maximum
overstitch width. This is illustrated for example in FIGS.
3 and 4. In the bottom part of FIGS. 3 and 4 from the
8. A zig-zag sewing machine according to claim 7,
wherein said needle reciprocating means includes a ro
tatable shaft, and said synchronizing means includes cam
means connected to said shaft arranged to shift the posi
middle downwards can be seen the zig-zag stitches of small \
tion of said loop taker in timed relationship to said needle
45
overstitch width just mentioned and also the possibility of
reciprocating means.
distribution of the zig-zag stitches over the entire work
9. A zig-zag sewing machine comprising a main frame,
a horizontal shaft member axially slidable in said main
ing ?eld of the needle.
For the lateral parallel displacement of the needlebar
frame, a needle frame pivotally mounted on said shaft
frame 108 or of the taker 128, hand operating means, 50 member, a needle reciprocatable in said needle frame, '
which are not specially shown in the drawings, can also
means to reciprocate said needle including a main shaft,
means to swing said needle frame about its pivot in timed
be provided.
relationship to its reciprocation, a loop taker drive shaft,
Various changes and modi?cations may be made with
out departing from the spirit and scope of the present
a loop taker disposed below said needle driven by said
invention and it is intended that such obvious changes 55 shaft, an oscillatory connecting rod pivotally connected to
said loop taker shaft and to said means to swing said
and modi?cations be embraced by the annexed claims.
needle about its pivot, cam means connected to said oscil
Having thus described the invention, what is claimed
latory ‘connecting rod intermediate its length, and to said
as new and desired to be secured by Letters Patent is:
main shaft to shift said connecting rod and said loop taker
1. In a zig-zag sewing machine including a main frame,
a needle frame pivotally mounted on said main frame, a 60 during the reciprocation of said needle and means con
nected to said cam means to shift said needle frame pivot
needle reciprocatable up and downwardly in said needle
in timed relation to movement of said loop taker.
frame, means to reciprocate said needle, and means to
10. A zig-zag sewing machine according to claim 9,
swing said needle frame about its pivot in timed rela
wherein said cam means includes an oscillatable cam con
tionship to the reciprocation of said needle, the improve
ment, comprising a loop taker disposed to cooperate with 65 nected to said main shaft and follower means engaged
with said cam and connected to said connecting rod to
said reciprocating needle and being operatively connected
shift said connecting rod during movement of said cam.
to said needle reciprocating means, and means connected
11. A zig-zag sewing machine according to claim 9,
to said needle reciprocating means, said loop taker and
said needle frame to displace said needle frame pivot 70 including means for rotating said loop taker in a plane
parallel to the axis of the drive shaft.
and said loop taker laterally in timed operative relation
12. In a zig-zag sewing machine including a main
ship, said loop taker being displaced only when said pivot
frame,
a needle frame pivotally mounted on said main
point is displaced.
frame, a needle reciprocatable upwardly and downwardly
2. In a zig-zag sewing machine according to claim 1,
including an axially slidable horizontal rod supported on 75 in said needle frame, means to reciprocate said needle,
3,089,444
8
and means to swing said needle frame about its pivot in
timed relationship to the reciprocation of said needle, the
improvement, comprising a loop taker disposed to cooper
ate With said reciprocating needle and being operatively
connected to said needle reciprocating means, and means
connected to said needle reciprocating means, said loop
taker and said needle frame including a sliding member
to displace said needle frame pivot and said loop taker
laterally in timed operative relationship.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,232,263
1,980,278
2,559,438
2,579,248
2,684,649
2,854,935
Finch ________________ __ July 3, 1917
Lockenvitz __________ __ Nov. 13, 1934
Joc'sak et al. __________ __ July 3, 1951
Austlid _____________ __ Dec. 18, 1951
Scarpa ______________ __ July 27, 1954
Benink et al. __________ _- Oct. 7, 1958
‘aA.“-#4,1
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