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Патент USA US3062174

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Nov. 6, 1962
3,062,164
‘SABURO SHIMADA
DEVICE FOR AUTOMATIC ZIGZAG SEWING
2 Sheets-Sheet 1
Filed June 10, 1959
v
INVENTOR.
BY
W 5.
M
Nov. 6, 1962
3,062,164
SABURO SHlMADA
DEVICE FOR AUTOMATIC ZIGZAG SEWING
2 Sheets-Sheet 2
Filed June 10, 1959
{Jul/
/
7
INVENTOR.
5m Jiémdw
BY
W S.
United Sta
atent
1
?ice
3,062,164
Patented Nov. 6, 19627
2
lower means 6. Consequently cam follower means 6 os
3,062,164
Saburo Shimada, Koganei-shi, Tokyo-t0, Japan, assignor
DEVICE FOR AUTOMATIC ZIGZAG SEWlNG
to Riccar Sewing Machine Co., Ltd., Tokyo, Japan, a
corporation of Japan
Filed June 10, 1959, Ser. No. 819,432
Claims priority, application Japan Sept. 8, 1958
4 Claims. ((31. 112—158)
cillates rocking member 8 in all position-s of selector 9.
Rocking member 8 has a forked arm receiving a pin
17 on another rocking member 10 which is turnable about
the pivot screw 18 and has another pivot screw 20 to
which a connecting rod 19 is turnably connected. Con
necting rod 19 forms part of a linkage, not shown, which
connects rocking member 19 with the needle bar so that
oscillation of the cam follower 6 will result in transverse
This invention relates to a device for automatic zigzag 10 oscillation of the needle bar whereby a zigzag ‘pattern is
sewing which comprises a block comprising a plurality
of concentric rugged cam tracks on one side for select
ing any of the cam tracks by means of a selector, and
stitched.
Before selector member 13 is shifted, a knob, not shown,
which is connected with connecting rod 19, is operated to
effect movement of rod 19 to the left as viewed in FIG. 1
changing zigzag widths according to said rugged cam
tracks, whereby patterns sewn according to the selected 15 whereby members 10 and 8 are turned to a position in
cam tracks are obtained.
which cam follower means 6 is retracted from the cam
In the accompanying drawings wherein an embodiment
of this invention is shown:
‘FIG. 1 is a plan View which shows partly in section the
lected cam track. Thereupon, the above mentioned knob,
principal part of the present device;
FIG. 2 is a vertical cross section thereof;
FIG. 3 is a side elevational section thereof;
FIG. 4 is an enlarged perspective view of one part of
the principal part vof the device;
.FIG. 5 is an enlarged perspective view of a rotary pro
?ling member; and
FIG. 6 is an enlarged perspective View of a selector
plate.
Description will now be made with reference to an em
tracks, and in this position, selector 9 is shifted by opera
tion of handle 13, to place cam follower 6 opposite a se
20 not shown, is turned back so that cam follower 6 engages
the selected cam track.
Before the setting member 13 is shifted, a knob, now
shown, which is connected with the connecting rod 19,v
is operated to effect movement of the connecting rod 19
25 to the left as viewed in FIG. 1, and turning of members
'10 and 8 to a position in which cam follower 6 is retracted
from the cam tracks, and in this position, selector mem
ber 13 is shifted to place cam follower 6 opposite a newly
selected cam track, whereupon the above-mentioned
bodiment of this invention as shown in the drawings. 30 knob, not shown, is turned back so that cam follower 6
engages the selected cam track. Since the rotary pro?ling
Numeral 1 indicates a rotary cam block for producing
member comprises a variety of rugged cam track sur
patterns comprising a plurality of concentric circles di
faces, various kinds of zigzag patterns can be sewn. The
vided on one side thereof and each section constitutes a
rotary cam block is of small dimensions as are the rug—
different rugged cam track, for example, the cam tracks
a, b, c, d and e. The rotary cam block 1 is mounted on 35 ged cam tracks on its side, and it is therefore convenient
for mounting in a machine. Furthermore, operation is
a control shaft 2 which is rotated by the drive shaft 5
of the sewing machine through a worm 4 and a worm
reliable as the rotary cam block is mounted on the rotary
control shaft 2 which is associated with the drive shaft
gear 3. A nut 2a clamps cam block 1 detachably against
of the machine and the cam follower 6 which contacts
a shoulder 2b of shaft 7. A support shaft 7 extends
perpendicular to the axis of rotation of cam block 1 and 40 the selected rugged cam tracks transmits its mot-ion to the
support a cam follower means 6 for sliding movement
needle bar through a linkage comprising the parts 80, 811,
in axial direction of support shaft 7, and in radial direc
10, 19 and other conventional parts, now shown.
I claim:
1. In a Zigzag sewing machine, in combination, a drive
shaft; a control shaft driven by said drive shaft; a cam
block secured to said control shaft for rotation with the
tion with respect to cam block 1, and its cam tracks. A
guide shaft means 12 extends parallel to support shaft 7
and supports a selector 9 for sliding movement thereon.
Selector member 9 has an arm with a pair of forked
same about an axis, said cam block having a face perpen
dicular to said axis formed with a plurality of circular
of a hub portion of cam follower means 6. A handle 13
cam tracks concentric with said axis and having different
forms part of selector 9 so that the latter can be manually
moved along shafts 7 and 12 to place cam follower 6 50 cam track patterns; a support shaft perpendicular to said '
axis; a cam follower means mounted on said support
on selected cam tracks of cam block 1.
shaft for reciprocating movement about the axis of said
Selector 9b has a collar, best seen in FIG. 4, formed
support shaft, and also for movement in axial direction of
with a segment-shaped slot 9a into which a catch 11 pro
portions slidable on shaft 7 and located on opposite sides
said support shaft and in radial direction of said cam block
jects under the action of a spring 14. Catch 11 is mount
ed for angular movement on selector 9 by means of pivot 55 between a plurality of positions engaging different cam
tracks of said cam block; a guide means parallel to said
screw‘lla.
support shaft; a manually operated selector member
Guide shaft 12 has axially spaced grooves 16 into which
mounted on said guide means movable along the same
catch 11 projects in successive positions of selector 9.
and along said support shaft and connected to said cam
The lateral faces of grooves 16 are frustoconical so that
60 follower means for moving the same between said posi
upon axial movement of selector 9, catch 11 is urged
tions; and means for connecting said cam follower means
out of a groove 16 and assumes a position releasing the
with the needle bar of the sewing machine so that the
respective groove 16 while turning in slot 9a. When after
needle bar is oscillated in zigzag stitch patterns correspond
further movement of selector 9, slot 9a is located opposite
ing to said cam track patterns.
the next groove 16, spring 14 snaps catch 11 into the 65
2. In a zigzag sewing machine, in combination, a drive
next groove, and it will be understood that cam fol
shaft; a control shaft driven by said drive shaft, said con
lower 6 is located opposite a different cam track in each
trol shaft having a reduced at least partly threaded por
tion bounded by a shoulder; an integral cam block seated
position of selector 9.
on said control shaft portion; threaded means threadedly
A rocking member 8 is mounted ‘on support shaft 7
non-movable in axial direction and turnable on the same. 70 engaging said control shaft portion to clamp said cam
block detachably against said shoulder so that said cam
Rocking member 8 carries a pin 80 which extends parallel
block is secured to said control shaft for rotation with
to shaft 7 and passes through a slot in an arm of cam fol
3,062,164
3
4
the same about an axis, said cam block having a face
said cam block is secured to said control shaft for rota
tion with the same about an axis, said cam block having
a face perpendicular to said axis formed'with a plurality
of circular cam tracks concentric with said axis surround
perpendicular to said axis formed with a plurality of cir
cular cam tracks concentric with said axis surrounding
said shoulder and having different cam track portions; a
support shaft perpendicular to said axis; a cam follower
means mounted on said support shaft for reciprocating
turning movement about the axis of said support shaft,
and also for movement in axial direction of said support
shaft and in radial direction of said cam block between a
ing said shoulder and having diiferent cam track patterns;
a support shaft perpendicular to said axis; a cam follower
means mounted on said support shaft for reciprocating
turning movement about the axis of said support shaft,
and also for movement in axial direction of said support
plurality of positions engaging different cam tracks of 10 shaft ‘and in radial direction of said cam block between
said cam block; a manually operated selector member
a plurality of positions engaging different cam tracks of
movable along said support shaft connected to said cam
said cam block; a guide shaft means parallel to said sup
follower means for moving the same between said posi
port shaft; a manually operated selector member mounted
tions; and means for connecting said cam follower means
on said guide shaft means movable along the same and
with the needle bar of the sewing machine so that the 15 along said support shaft and connected to said cam fol
needle bar is oscillated in zigzag stitch patterns corre
sponding to said cam track patterns.
3. In a zigzag sewing machine, in combination, a drive
shaft; a control shaft driven by said drive shaft; a cam
block secured to said control shaft for rotation with the
same about an axis, said cam block having a face perpen
dicular to said axis formed with a plurality ‘of circular
cam tracks concentric with said axis and having different
cam track patterns; a support shaft perpendicular to said
lower means for moving the same between said positions;
a catch on said selector member cooperating with said
guide shaft means; a rocking arm member mounted on
said support shaft non-movable in axial direction and
turnable on the same; means for connecting said cam fol
lower means with said rocking arm member for turning
movement therewith and including a forked part of said
cam follower means, and an elongated pin slidably dis
posed in said forked part and secured to said arm mem
axis; a cam follower means mounted on said support
ber; and means for connecting said rocking member with
the needle bar of the sewing machine and including an
other rocking member, a connecting pin on said other
rocking member, a forked part on said rocking arm mem
ber turnably receiving said connecting pin, and a rod ar
ferent cam tracks of said cam block; a guide shaft means 30 ticulated ‘to said other rocking member for connecting
parallel to said support shaft; a manually operated se
the same to the needle bar so that the needle bar is oscil
lector member mounted on said guide shaft means mov
lated in zigzag stitch patterns corresponding to said cam
able along the same and having a portion slidable on said
track patterns.
shaft for reciprocating turning movement about the axis
of said support shaft, and also for movement in axial di
rection of said support shaft and in radial direction of said
cam block between a plurality of positions engaging dif
support shaft and connected to said cam follower means
for moving the same between said positions; a rocking
arm member mounted on said support shaft non-movable
in axial direction and turnable on the same; means for
connecting said cam follower means with said rocking
arm member for turning movement therewith and includ
References Cited in the ?le of this patent
UNITED STATES PATENTS
2,005,070
2,701,108
Bitzer ______________ __ June 18, 1935
Muschamp ___________ __ Feb. 1, 1955
ing a forked part of said cam follower means, and an 4,0
2,743,622
Haupt ________________ __ May 1, 1956
elongated pin slidably disposed in said forked part and
2,833,233
D’Amico _____________ .._ May 6, 1958
secured to said arm member; and means for connecting
2,900,937
2,906,219
2,969,756
3,000,333
Gegauf ______________ __ Aug. 25,
Vigorelli ____________ __ Sept. 29,
Eriksson ____________ __ Jan. 31,
Moro ______________ __ Sept. 19,
said rocking member with the needle bar of the sewing
machine so that the needle bar is oscillated in zigzag
stitch patterns corresponding to said cam track patterns.
4. In a zigzag sewing machine, in combination, a drive
FOREIGN PATENTS
shaft; a control shaft; worm gear means connecting said
shafts so that said control shaft is driven by said drive
shaft, said control shaft having a reduced at least partly
threaded portion bounded by a shoulder; an integral cam 50
block seated on said control ‘shaft portion; threaded means
threadedly engaging said control shaft portion to clamp
said cam block detachably against said shoulder so that
1959
1959
1961
1961
300,900
525,946
552,428
1,143,023
783,358
Switzerland _..__, _______ __ Nov. 1, 1954
Italy _______________ __ May 12,
Italy ________________ __ Dec. 3,
France ______________ __ Apr. 8,
Great Britain ________ __ Sept. 25,
1955
1956
1957
1957
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