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Патент USA US3019760

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Feb. 6, 1962
|_. BONO
3,019,750
FEED DEVICE FOR A SEWING-MACHINE
Filed March 18, 1958
FIG
3
FIG.2
1
11 I
e
5
|
1
12
14
15
.
5Z
9
17
2119'
FIG. 4
z‘Z?EVQZ’S
2
Block 14 and therefore feed dog 17 can therefore be
3,919,756
Luigi Bone, Pavia, Italy, assigns: to Necchi S.p,A.,
displaced along the axis of pivot 15 while able to rotate
FEED DEVICE Filth A SE‘WII‘JG-MACHINE
‘
about the axis of the same pivot.
Such rotation is utilized to obtain the up and. down
movement of feed deg 17 by means or" eccentric cam 3
which acts on small adjustable plate 18 connected with
the end of lever 19, which has its journal 20 on the base
plate of the machine.
At about the middle of lever 19 a ball 21 is turnably
Pavia, Etaly, a ?rm
Filed Mar. 18, 1958, Ser. No. 722,168
Claims priority, application Italy Apr. 12, 1957
12 ?laims. (Cl. 112-415)
Object of the present invention is a mechanical feed
ing unit for a sewing-machine.
10 mounted in a longitudinal slot 19’ of lever I? and con
As it is known the base plate of the sewing-machine
tacts the bottom face of feed member 17 to transmit
has under the needle an opening through which pro~
the rising movement to the same. The downward move
trudes a feed member provided with teeth. The feed
ment of feed dog 17 is obtained by return spring 22.
member performs a composite movement along a rec
tangular path composed of rising, moving forward, going
down and moving backwards.
Consequently, lever '7, actuated by lever 5, directly
15 operates feed dog 17 in its forwards and backwards move
ment.
Generally these movements are controlled by two dis
tinct kinematic synchronized actuating means driven from
As it is shown in FIG. 3, the vertical lever 7 is pro
vided with an opening 23 through which passes shaft 24
the rotating main shaft of the machine, so that by means
actuating the “shuttle,” not shown in the drawing.
of cams or eccentrics the continuous rotary motion is 20
One embodiment has been described as an example
transformed into oscillatory movements. Such move
and variations of the form, the dimensions, the material
ments, suitably in phase coincidence, are transmitted by
and the assembly of the various members should be con
means of shafts to the feed dog, which is thus operated
sidered the limits of the present invention as de?ned in
to move along a rectangular path.
the claims.
I claim:
The device of the present invention directly actuates 25
the feed dog, completely eliminating intermediate shafts.
1. Feeding mechanism for a sewing machine, compris
In this manner the unit functions very precisely and
ing, in combination, supporting means; a feed member;
obtains a perfect seam.
means for mounting said feed member on said supporting
means for angular rocking movement about a ?rst axis
Besides, due to its compact construction, it is particu
30 and for reciprocating feeding movement in direction of
larly suitable for sewing sleeves, stockings etc.
said first axis; means operatively connected to said feed
The following description refers to the appended draw
ings in which
member for reciprocating the same in direction of said
first axis; a driven cam means rotatable in one direc
FIG. 1 is a plan view of the feed device.
tion; lever means extending parallel to said ?rst axis and
FIG. 2 is a sectional view taken on line 2-—2 of FIG. 1.
being mounted on said supporting means for angular
FIG. 3 is a sectional view taken on line 3—3 of FIG. 1.
FIG. 4 is a longitudinal sectional view taken on line
4-4 of FIG. 1.
The movement of the unit is obtained from a shaft 1,
movement about a second axis, said lever means being
operatively connected to said rotary cam means to be
rocked about said second axis, said lever means support
ing said feed member for movement therealong in said
performing a continuous rotating movement, and driven
40 direction of said ?rst axis so that said. feeding member
by means not shown in the ?gures.
Cam 2 causes
is rocked by said lever means when the same is rocked
the horizontal motion of feed dog and cam 3 causes its
by said cam means, while being supported by said lever
rising and sinking movement.
means during movement in said direction of said ?rst
Cam 2 acts inside a fork 4, on one end of lever 5, and
moves said lever in an oscillatory up and down move 45
axis.
Said shaft carries two cams 2 and ‘3.
ment. Lever 5 is fulcrumed at about half of its length
Irwin
on a pivot 6 on a vertical lever 7, which is fulcrumed
on a ?xed pivot 8.
Lever 5 pivotally supports on its other end the guide
block 9 which is slidable in a guide 10 on shaft 11, which
2. Feeding mechanism for a sewing machine, compris
ing, in combination, supporting means; a feed member
having a workpiece engaging portion; means for mount
ing said feed member on said supporting means for
angular rocking movement about a ?rst axis spaced from
said workpiece engaging portion and for reciprocating
order to obtain the regulation of the stitch length and of
the feeding direction. The regulation is obtained by an
feeding movement in direction of said ?rst axis; means
operatively connected to said feed member for recipro
cating the same in direction of said ?rst axis; a driven
gularly displacing the trajectory of guide block 9 in guide
cam means rotatable in one direction; lever means ex
vertical a cause longitudinal motions of lever 5 during
said supporting means for angular movement about a
second axis transverse to said ?rst axis, said lever means
being operatively connected to said rotary cam means
to be rocked about said second axis, said lever means
can be manually rotated and set in a selected position in
it). Such angular rotations of guide 10 with respect to 55 tending parallel to said ?rst axis and being mounted on
its oscillation, thus displacing pivot 6 and consequently
lever 7 with respect to its middle position shown in FIG. 3.
These reciprocating motions cause an oscillation of
lever 7, whose amplitude corresponds to the inclination of 60 supporting said workpiece engaging portion of said feed
member for movement therealong in said direction of
guide 10 with respect to the vertical. Besides, the oscilla
said ?rst axis so that said feeding member is rocked by
tion will be in?uenced by placing the same end of guide it}
on different sides of a vertical plane a.
The oscillatory motion of lever 7 is directly trans
said lever means when the same is rocked by said cam
means, while being supported by said lever means during
mitted to feed member 17 through slide 12 mounted on 65 movement in said direction of said ?rst. axis.
3. Feeding mechanism for a sewing machine, compris
lever 7 by means of pivot 13. The slide actuates a bear
ing, in combination, supporting means; a feed member
means for mounting said feed member on said support
ing means for angular rocking movement about a ?rst
the latter can rotate about the axis of pivot 15 on which
axis and for reciprocating feeding movement in direction
70
it is mounted for sliding movement in axial direction of
of said ?rst axis; a ?rst cam means rotatable in one
the same together with block 14.
direction and operatively connected to said feed member
ing block 14 engaged thereby and consequently shifts
feed dog 17 which is secured to block 14. Nevertheless
aoraveo
3
4
a second cam means rotatable in one direction; lever
tion of said feed member for movement therealong in said
direction of said ?rst axis so that said feeding member is
means extending parallel to said ?rst axis and being
rocked by said lever means’ when the same is rocked by
mounted on said supporting means for angular move
ment about a second axis transverse to said ?rst axis,
said second cam means, while being supported by said
for reciprocating the same in direction of said ?rst axis;
said lever means being operatively connected to said
second rotary cam means to be rocked about said second
lever means during movement in said direction of said
?rst axis.
7. Feeding mechanism for a sewing machine, com
prising, in combination, supporting means; a feed mem~
axis, said lever means supporting said feed member for
ber having a workpiece engaging portion; means for
movement therealong in said direction of said ?rst axis
so that said feeding member is rocked by said lever 10 mounting said feed member on said supporting means for
angular rocking movement about a ?rst axis spaced from
means when the same is rocked by said lever means
when the same is rocked by said second cam means,
said workpiece engaging portion and for reciprocating
feeding movement in direction of said ?rst axis; a rocking
while being supported by said lever means during move
member mounted on said supporting means for angular
ment in said direction of said ?rst axis.
4. Feeding mechanism for a sewing machine, compris 15 movement about a rocking axis extending transverse to
said ?rst axis, said rocking member being operatively con
ing, in combination, supporting means; a feed member
nected to said feed member for reciprocating the same in
means for mounting said feed member on said support
ing means for angular rocking movement about a ?rst
direction of said ?rst axis; ?rst driven cam means rotatable
in one direction and operatively connected to said rocking
axis and for reciprocating feeding movement in direction
of said ?rst axis; a drive shaft rotatable in one dierction; 20 member for rocking the same about said rocking axis;
a ?rst cam means and a second cam means secured to
second driven cam means rotatable in one direction; lever
said drive shaft for rotation with the same in said one
direction, said ?rst cam means being operatively con
nected to said feed member for reciprocating the same
in direction of said ?rst axis; lever means extending 25
means extending parallel to said ?rst axis and being
parallel to said ?rst axis and being mounted on said
mounted on said supporting means for angular move
ment about a second axis transverse to said ?rst axis, said
lever means being operatively connected to said second
rotary cam means to be rocked about said second axis,
supporting means for angular movement about a second
axis transverse to said ?rst axis, said lever means being
operatively connected to said second rotary cam means
said lever means supporting said workpiece engaging por
tion of said feed member for movement therealong in
said direction of said ?rst axis so that said feeding member
to be rocked about said second axis, said lever means 30 is rocked by said lever means when the same is rocked by
supporting said feed member for movement therealong
in said direction of said ?rst axis so that said feeding
member is rocked by said lever means when the same
is rocked by said second cam means, while being sup
ported by said lever means during movement in said 35
direction of said ?rst axis.
5. Feeding mechanism for a sewing machine, com
prising, in combination, supporting means; a feed mem
ber; a supporting shaft mounted on said supporting means
said second cam mean, while being supported by said lever
means during movement in said direction of said ?rst axis.
8, Feeding mechanism for a sewing machine, compris
ing, in combination, supporting means; a feed member
having a workpiece engaging portion; means for mounting
said feed member on said supporting means for angular
rocking movement about a ?rst axis spaced from said
workpiece engaging portion and for reciprocating feeding
movement in direction of said ?rst axis; a rocking member
and supporting said feed member for angular rocking 40 mounted on said supporting means for angular movement
movement about a ?rst axis and for reciprocating move
about a rocking axis extending transverse to said ?rst axis,
ment therealong in direction of said ?rst axis; a ?rst cam
said rocking member being operatively connected to said
means rotatable in one direction and operatively connect
feed member for reciprocating the same in direction of
ed to said feed member for reciprocating the same in
said ?rst axis; a driven shaft rotatable in one direction and
direction of said ?rst axis; a second cam means rotatable 45 having an axis transverse to said ‘?rst axis; a ?rst cam
in one direction; lever means extending parallel to said
means and a second cam means secured to said drive
?rst axis and being mounted on said supporting means
shaft for rotation with the same in said one direction, said
for angular movement about a second axis transverse to
?rst cam means being operatively connected to said rock
said ?rst axis, said lever means being operatively con
ing member for rocking the same about said rocking axis;
nected to said second rotary cam means to be rocked about 50 lever means extending parallel to said ?rst axis and be
said second axis, said lever means supporting said feed
member for movement therealong in said direction of said
?rst axis so that said feeding member is rocked by said
lever means being operatively connected to said second
lever means when the same is rocked by said second cam
rotary cam means to be rocked about said second axis,
ing mounted on said supporting means for angular move
ment about a second axis transverse to said ?rst axis, said
means, while being supported by said lever means during 55 said lever means supporting said workpiece engaging por
movement in said direction of said ?rst axis.
tion of said feed member for movement therealong in said
6. Feeding mechanism for a sewing machine, com
direction of said ?rst axis so that said feeding member is
prising, in combination, supporting means; a feed member
rocked by said lever means when the same is rocked by
having a workpiece engaging portion; a supporting shaft
said second cam means, while being supported by said
mounted on said supporting means and supporting said 60 lever means during movement in said direction of said
feed member spaced from said workpiece engaging por
tion for angular rocking movement about a ?rst axis and
?rst axis.
9. A feeding mechanism as set forth in claim 8 and in
for reciprocating movement therealong in direction of
cluding a guide member mounted on said support means
said ?rst axis; a drive shaft rotatable in one direction; a
turnable for adjustment about an axis parallel to said
?rst cam means and a second cam means secured to said 65 second axis; a lever having fulcrumed on said rocking
drive shaft for rotation with the same in said one direc
tion, said ?rst cam means being operatively connected to
said feed member for reciprocating the same in direction
of said ?rst axis; a driven cam means rotatable in one direc
member and having on one end thereof a slide member
guided in said guide means, said lever having the other
end thereof forked and engaged by said ?rst cam means
and rocked by said ?rst cam means so that said lever is
tion; lever means extending parallel to said ?rst axis and 70 reciprocated in longitudinal direction thereof while said
being mounted on said supporting means for angular move
one end thereof is displaced in said longitudinal direction
ment about a second axis transverse to said ?rst axis, said
by said slide member sliding in such guide member where
lever means being operatively connected to said second
by said rocking member is rocked about such rocking axis.
rotary cam means to be rocked about said second axis,
10. Feeding mechanism for a sewing machine com
said lever means supporting said workpiece engaging por 75 prising, in combination, a supporting means; a feed mem
5
3,019,750
bet; guide means mounted on said supporting means for
turning movement; means for mounting said feed member
on said supporting means for angular rocking movement
about a horizontal axis and for reciprocating movement
in direction of said horizontal axis; a drive shaft; two
cam means secured to said drive shaft; two lever means
extending parallel to said axis, each of said lever means
being in direct operative connection with one of said cam
means; the ?rst of said lever means being horizontally
fulcrumed to said supporting means and slidingly engag
ing said feed member for effecting angular rocking move
ments of said feed member about said horizontal axis;
the second of said lever means having one pivot slidably
engaging said guide means and being operatively con
nected to said feed member for reciprocating feeding 15
movement of said feed member.
11. Feeding mechanism for a sewing machine compris
ing, in combination, a‘ supporting means; a feed member;
guide means mounted on said supporting means for turn
6
means for mounting said feed member on said supporting
means for angular rocking movement about a horizontal
axis and for reciprocating movement in direction of said
horizontal axis; a horizontal rotatable drive shaft per
pendicular to said axis; two cam means secured to said
drive shaft; two lever means extending parallel to said
axis, each of said lever means being in direct operative
connection with one of said cam means; the ?rst of said
lever means being horizontally fulcrumed to said sup
porting means perpendicularly to said axis and slidingl},r
engaging said feed member for effecting angular rocking
movement of said feed member about said horizontal
axis; the second of said lever means having one pivot;
an orientatable guide means horizontally fulcrumed to
said supporting means perpendicularly to said axis and
being fulcrumed, said pivot of said second lever being
guided in said guide means, a third lever means pivotally
connected to said second lever means and being ful
crumed to said supporting means and being in operative
ing movement; means for mounting said feed member on 20 sliding engagement with said feed member, the point of
said supporting means for angular rocking movement
sliding contact between said feed member and said ?rst
about a horizontal axis and for reciprocating movement
lever means and the connection between said feed mem
in direction of said horizontal axis, a drive shaft; two cam
ber and said second lever means being disposed on oppo
means secured to said drive shaft; two lever means ex
site sides of said axis.
tending parallel to said axis, each of said lever means
means being in direct operative connection with one of
said cam means; the ?rst of said lever means being hori
zontally fulcrumed to said supporting means and sliding
ly engaging said feed member for effecting angular rock
ing movement of said feed member about said horizontal 30
axis; the second of said lever means having one pivot
engaged on guide sliding means fulcrumed to said sup
porting means; a third lever means pivotally connected
to said second lever means and fulcrumed to said sup
porting means and being in operative sliding engagement 35
with said feed member.
12. Feeding mechanism for a sewing machine compris
ing, in combination, a supporting means; a feed member;
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,142,359
2,007,863
2,442,647
2,725,023
2,808,793
2,844,114
2,906,220
Onderdonk ____________ __ June 8,
Jenni _________________ __ July 9,
Fischbein _____________ __ June 1,
Ayres _______________ __ Nov. 29,
Ayres _________________ __ Oct. 8,
Benink et al ___________ __ July 22,
Perla et al _____________ __ Sept. 29,
1915
1935
1948
1955
1957
1958
1959
FOREIGN PATENTS
518,620
945,060
Italy _________________ __ Mar. 8, 1955
Germany ____________ __ June 28, 1956
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