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Патент USA US3057321

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Oct. 9, 1962
R. E- JOHNSON
3,057,311
CAM MOUNTING MEANS FOR ZIGZAG SEWING MACHINES
Filed Jan. 25. 1960
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IN VEN TOR.
RAL PH E . JOHNSON
BY
WITNESS
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PZLZQKZ/
P2
y’ ATTORNEY
United States Patent O?lice
3,057,31 l
Patented Oct. 9, 1962
2
1
downwardly from the designed position before the shoul
11
CAM MOUNTING MEANS FUR ZEGZAG SEWING
.l
MAQMNES
>
Ralph E. Johnson, Mountainside, N..l., assignor to The
Singer Manufacturing Company, Elizabeth, N.J., a
i
i corporation of New Jersey
Filed Jan. 25, 1969, Ser. No. 4,312
l
5 Claims. (Cl. 112-158)
der 12 contacts the surface 11. Above the intermeditae
portion 8, the stud 4 has a reduced diameter upper por
tion 13 concentric with the intermediate portion 8 and
having a screw driver slot 14 in the upper end thereof.
Journaled on the intermediate portion 8 of the stud 4
is a tubular cam shaft 15 having a central bore 16 that
receives the intermediate portion 8 and de?ning an an
nular side wall. The lower end of the cam shaft 15 is in
The present invention relates to zigzag sewing ma 10 bearing engagement with the surface 11 of the boss 3.
There is provided a pair of meshing gears for imparting
chines and particularly to a zigzag sewing machine of the
rotation to the cam shaft 15 comprising a worm wheel 17
type having a replaceable stitch pattern cam for imparting
formed on the lower end of the cam shaft 15 that meshes
lateral vibration to the needle bar and thereby de?ning an
with a worm 18 on the main shaft 2.
ornamental stitch pattern.
On the upper end of the cam shaft 15 there is a ?ange
The object of this invention is to provide, in such a 15
sewing machine, an improved and simpli?ed mounting for
the stitch pattern cam that is economical, and provides
an e?icient, dependable, and durable construction. It is
19 having a seat 20‘ formed on the upper face thereof for
receiving a stitch pattern cam 21 having a peripheral
pattern surface 22. The cam 21 is clamped on the seat
20 by a thumb screw 23 having an enlarged head 24, an
a speci?c object of this invention to provide a construc
tion for mounting and driving a stitch pattern cam in a 20 externally threaded shank 25 that is screwed into the in
ternally threaded upper portion of the bore 16 in the cam
zigzag sewing machine, wherein the elements can be pre
shaft 15, and a central bore 26 through which the reduced
assembled and inserted into the machine as a unit and
upper portion 13 of the stud 4 extends. The cam 21 is
wherein manufacturing and assembly has been simpli?ed
positioned angularly on the seat 20 by a pin 27 extending
in that, for the most part, they are not critical.
Having in mind the above and other objects that will 25 through the ?ange 19 on an axis parallel to the stud 4
and secured therein by a set screw 28. The pin 27 ex
be evident from an understanding of this disclosure, the
tends above the seat 20 and enters a radial slot 29 in the
invention comprises the devices, combinations and ar
cam 21.
rangements of parts as illustrated in the presently pre
Below the ?ange 19‘ the cam shaft 15 is provided with
ferred embodiment of the invention which is hereinafter
set forth in such detail as to enable those skilled in the 30 a second ?ange 30 which, below the pin 27, has a seat
31 formed on the upper surface thereof for receiving a
art readily to understand the function, operation, con
struction and advantages of it when read in conjunction
key 32. A horizontal slot 33 is cut through the side wall
with the accompanying drawings in which:
of the cam shaft 15, the slot 33 having the bottom edge
thereof in a plane with the seat 31 extending substan
tially one-half the distance around the cam shaft. In the
‘area opposite the slot 33, there is formed in the periphery
of the intermediate portion 8 of the stud 4 an annular
groove 34. The key 32 extends through the slot 33 and
into the groove 34 and has an inner edge 35 formed to
embrace the stud 4 at the base of the groove 34. The
key 32 is held on the seat 31 by the pin 27 which has a
reduced diameter lower end 36 entering a hole 37 in the
‘
FIG. 1 is a fragmentary top plan view of the bracket
arm of a sewing machine embodying the present inven
tion and in which the top cover plate has been removed.
FIG. 2 is a sectional view taken substantially on the
line 2——2 of FIG. 1.
FIG. 3 is a detail sectional view taken substantially on
the line 3—3 of FIG. 2.
FIG. 4 is a detail sectional view taken substantially on
the line 4——4 of FIG. 2.
The present invention is herein illustrated as embodied
key.
The cam 21 is designed to be interchangeable with sim
in the zigzag sewing machine forming the subject matter
of the copending United States patent application of 45 ilar cams having a different periphreal cam surface, such
as the surface 22, which will produce a different orna
Johnson, Serial No. 4,430, ?led January 25, 1960, where
in the machine is fully disclosed and to which reference
mental stitch pattern. To replace the cam 21, the clamp
ing screw 23 is backed off, the cam removed, a different
may be had for a more complete understanding thereof.
cam substituted, and the clamping screw 23 replaced.
With reference to the drawings, there is illustrated the
bracket arm 1 of a sewing machine having a rotary main 50 ‘In effect, the clamping screw 23 is journaled on the re
duced upper portion 13 of the stud 4- which serves to align
shaft 2 journalled longitudinally thereof. Mounted in
the threads of the screw with those in the bore 16, thus
the bracket arm 1 in a bearing boss 3 is a vertical axis
facilitating replacing the clamping nut.
stud 4. The stud 4 has a mounting portion 5 at its lower
end that is received within a bore 6 in the boss 3 and in
In the usual manner, the top of the bracket arm 1 is
which it is secured by a set screw 7. Above the mounting 55 open and is adapted to be closed by a top cover plate 38.
To obtain accessibility for changing the cam 21, the cover
portion 5 of the stud 4 there is an intermediate portion
8 that is enlarged diametrically and disposed eccentrically
plate has a cut-out 39 exposing the cam through the cover
relatively to the mounting portion 5. Between the mount
plate 38, and a hinged plate 40 is provided on the cover
ing portion 5 and the intermediate portion 8, the stud 4
plate and overhanging the cam 21.
is formed with a groove 9 that reduces the periphery of 60
When the present mechanism is assembled in the ma
the stud 4 to less than the diameter of the mounting por
chine, it is ?rst preassembled as a unit on the stud 4. The
tion 5. The groove 9 is located so that the shoulder 10
cam shaft 15 is placed on the stud 4 and the key 32 is
which de?nes the bottom edge of the groove 9 and the top
placed on the seat 31 and inserted through the slot 33 and
edge of the mounting portion 5 is generally aligned with
into the groove 34 in the stud 4. The pin 27 is then in
the top surface 11 of the boss 3 when assembled, which 65 serted and, with the end 36 thereof seated in the hole
surface is accurately machined and constitutes a position—
37 of the key, it is locked by the set screw 28. The cam
ing surface. The width of the groove ‘9 is not critical but
21 and the clamping screw 23 may be placed on the cam
is made wide enough so that the shoulder 12, which de
shaft 15 at this time or it may be placed thereon at a later
?nes the top edge of the groove 9 and the bottom edge
time. The unit is then inserted into the machine with the
:of the intermediate portion 8, is disposed in substantial 70 mounting portion 5 of the stud 4 entering the bore 6 in
spaced relation relatively to the surface 11, thus provid
the boss 3. The assembly is moved downwardly until
ing for a signi?cant endwise movement of the stud 4
the bottom of the cam shaft 15 engages the surface 11
3,057,311
4
through said slot and into said groove, and means car
of the boss v3 and thereafter, the stud 4 is moved down
wardly until the key 32 engages the upper edge of the
ried by said cam shaft for releasably holding said key in
groove 34.
said slot and said groove.
3. In a zigzag sewing machine having a frame, a boss
By means of the screw driver slot 14, the
stud 4 is turned which, through the eccentricity of the in
termediate portion 8 relatively to the mounting portion 5,
adjusts the axis of the cam shaft 15 toward and away from
in said frame having a positioning surface and a bore
intersecting said positioning surface, a stud mounted in
the main shaft 2 to obtain the desired meshing relation
said bore for endwise adjustment, means for releasably
securing said stud in said bore in adjusted position, a
between the worm 18 and worm wheel 17. The stud 4 is
tubular cam shaft having an annular side wall and a
then locked by means of the set screw 7. The cam shaft
15 is held against endwise movement on the stud 4 by 10 central bore for receiving said stud and for journalling
said cam shaft on said stud, said cam shaft being po
the surface 11 and the key 32.
sitioned on said stud with the end thereof in bearing
The primary advantage of the construction in accord
engagement with said positioning surface, means for
ance with this invention is that the parts have reduced
imparting rotation to said cam shaft, said cam shaft
tolerance requirements which reduce manufacturing ex
penses, and can be primarily assembled by inexpensive 15 having a cam receiving seat for supporting an ornamen
labor. The initial assembly of the unit is simple and
not critical in any respect. The only alignment that is
necessary is at the time that the unit is assembled into the
machine and this is only to adjust the axis of the cam
tal stitch pattern cam, means for releasably clamping
a cam on said seat, a ?ange on said cam shaft having
a seat, said cam shaft having a slot normal to the axis
shaft 15 relatively to» the axis of the main shaft 2,
which is provided by the eccentric portion 8 of the stud
4. The only other alignment that is necessary is the
of said stud and extending through the annular side Wall
thereof, said stud having an annular groove in the pe
riphery thereof and communicating with said slot, a key
mounted on said seat and extending through said slot
vertical positioning of the cam shaft 15 to locate the
into said groove, and means carried by said cam shaft for
vention are intended to be included within the scope
a cam-receiving seat formed to receive an ornamental
stitch pattern cam, a screw for clamping a cam on
releasably holding said key in said slot and said groove.
worm wheel 17 and this is accomplished by the surface
4. In a zigzag sewing machine having a frame, a boss
11. The groove 10' can accommodate wide variations 25
in said frame having a positioning surface and a bore
in manufacturing tolerances to take up end play of the
intersecting said positioning surface, a stud mounted in
cam shaft 15 on the stud 4. The dimension of the groove
said bore for endwise adjustment and projecting from
34 also is not critical, but preferably is made wide
said positioning surface, means for releasably securing
enough to facilitate insertion of the key 32.
Numerous alterations of the structure herein disclosed 30 said stud in said bore in adjusted position, a tubular
cam shaft having an annular side wall and a central
will suggest themselves to those skilled in the art. How
bore for receiving said stud and for journalling said cam
ever, it is to be understood that the present disclosure
shaft on said stud, said cam shaft being positioned on
relates to a preferred embodiment of my invention which
said stud with the end thereof in bearing engagement with
is for purposes of illustration only and not to be con
strued as a limitation of the invention. All such modi? 35 said positioning surface, means for imparting rotation
to said cam- shaft, a ?ange on said cam shaft having
cations which do not depart from the spirit of the in
of the ‘appended claims.
Having thus described the nature of the invention, what
said seat, a pin slidably extending through said ?ange
I claim herein is:
40 and having an end project-ing from said cam-receiving
seat for positioning a cam angularly on said cam-receiv
1. In a zigzag sewing machine having a frame‘, a stud
ing seat, said cam shaft having a key-receiving seat, and
mounted in said frame, a tubular cam shaft having an
having a slot extending through the annular side wall
annular side wall and a central bore for receiving said
thereof and intersecting said key-receiving seat, said
stud and for journalling said cam shaft on said stud,
stud having an annular groove in the periphery thereof
means on said frame for positioning said cam shaft end
wise relatively to said stud, means for imparting rota 45 and communicating with said slot, a key mounted on
tion to said cam shaft, said cam shaft having a cam
receiving seat for supporting an ornamental stitch pat
tern cam, means for v[releasably clamping a cam on
said key-receiving seat and extending through said slot
into said groove, said pin cooperating with said key for
holding the same in assembled relation, and means for
said seat, and means for positioning and securing said
releasably securing said pin in position.
ing said key in said slot and said groove.
mounting portion in said bore in adjusted position, a tu
said bore for endwise adjustment, means for releasably
securing said stud in said bore in adjusted position, a
diate portion, said cam shaft being positioned on said
stud with the end thereof in bearing engagement with
said positioning surface, means for imparting rotation to
5. In a zigzag sewing machine having a frame, a boss
cam shaft on said stud comprising a key carried by said 50
in said frame having a positioning surface and a bore
cam shaft, said cam shaft having a slot normal to the
intersecting said positioning surface, a stud having a
axis of said stud and extending through the side wall
mounting portion at the one end, an intermediate por
thereof, said stud having an annular groove in the pe
tion, and a reduced end portion at the other end, said
riphery thereof and communicating with said slot, said
key extending through said slot and into said groove, 55 mounting portion ‘being received in said bore for end
wise adjustment, means for releasably securing said
and means carried by said cam shaft for releasably hold
bular cam shaft having an annular side wall and a cen
2. In a zigzag sewing machine having a frame, a boss
tral bore for receiving the intermediate portion of said
in said frame having a positioning surface and a bore
intersecting said positioning surface, a stud mounted in 60 stud and for journalling said cam shaft on said interme
tubular cam shaft having an annular side wall and a
said cam shaft, a ?ange on said cam shaft having a cam
65 receiving seat formed to receive an ornamental stitch
pattern cam, a screw having a central bore for receiving
sitioned on said stud with the end thereof in bearing
central bore for receiving said stud and for journalling
said cam shaft on said stud, said cam shaft being po
engagement with said positioning surface, means for im
par-ting rotation to said cam shaft, said cam shaft having
the reduced end portion of said stud and an externally
threaded shank threaded into the end of said cam shaft
said seat, said stud having an annular groove in the
periphery thereof and said cam shaft having a slot nor
projecting from said cam-receiving seat for positioning
for clamping a cam on said cam-receiving seat, a pin
a cam receiving seat for supporting an ornamental stitch
pattern cam, means for releasably clamping a cam on 70 slidably extending through said ?ange and having an end
a cam angularly on said cam-receiving seat, said cam
shaft having a key-receiving seat, and having a slot ex
mal to the axis of said stud and extending through the
tending through the annular side wall thereof and inter
annular side Wall thereof and communicating with said
groove, a key carried by said cam shaft and extending 75 secting said key-receiving seat, said stud having an annu
3,057,311
6
5
lar groove in the periphery thereof and communicating
with said slot, a key mounted on said key-receiving seat
'
and extending through said slot into said groove, said
7'
pin cooperating with *said key for holding the same in
assembled relation, and means for releasably securing 5
said pin in position.
References Cited in the ?le of this patent
UNITED STATES PATENTS
294,632
Kennedy et a1. _______ __ Mar. 4, 1884 10
810,490
1,015,476
1,257,585
2,355,943
2,862,468
2,900,937
2,906,219
Gegauf _____________ __ Aug. 25, 1959
Vigorelli ____________ __ Sept. 29, 1959
531,323
Belgium ___________ __ Feb. 23, 1955
Knupp et a1. ________ __ Jan. 23, 1906
Clouse _____________ __ Jan. 23, 1912
Davis ______________ __ Feb. 26, 1918
Beede et a1. _________ __ Aug. 15, 1944
Johnson ____________ __ Dec. 2,
1958
FOREIGN PATENTS
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