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Патент USA US2130340

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Sept 20, 1938-
Filed 0G12. 50, 1937
2 Sheets-Sheet l
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Sept 20, 1938.
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Filed Oct. 30, 1957
2 Sheets-Sheet 2
Patented Sept. 20, 1938
AUnirse stares ¿PATENT oFFicE
Hubert J. Gallant, Exeter, N. H., and Ernest A.
Gauthier, Amesbury, Mass.
Application October 30, 1937, Serial No. 171,934
7 Claims. (Cl. 112--125)
This invention relates to improvements in
trimming mechanism for sewing machines.
More especially it provides an improved trim
ming mechanism for coaction with the stitching
and work-feeding mechanism of a Singer sewing
machine of “walking foot” type, having a flat bed
as distinguished from a cylindrical bed.
Mechanisms for trimming as the stitching pro
gresses have heretofore been available for use only
on sewing machines not having a “walking foot”
feed, or on “walking foot” machines having a
cylindrical bed; and have been complicated and
cumbersome devices.
No one, so far as we are
aware, has successfully combined a trimming
mechanism, in a simple and unobtrusive practi
invention disclosed.
In the acompanying drawings: '
Figure 1 is an end elevation of a sewing ma~
chine head, embodying features of the invention;
Figure 2 is an elevation looking from the leftv
in Figure 1 at the rear side of the head;
Figure 3 is an elevation of the lower portion of
the head, looking from the right in Figure 1 at
the front side of the head;
Figure 4 is an elevation of the lower portion of ¿e
the head, looking from the left in Figure 2;
feeding mechanism of a “walking foot” iiat bed
Figure 5 is a plan, in section on 5_5 of Figure l;
Figure 6 is a plan of the bed plate; and
Figure '7 is a view like Figure l of the lower por
tion of the head, but with the trimmer plate and 20
a trimmer mechanism which is simple, as com
ever features of patentable novelty exist in the
cable form, with the regular stitching and work
type of sewing machine.
The invention has among its objects to provide
under side of the plate, to support the incidental
cut end of the shearing bar of the plate.
It is intended that the patent shall cover, by
suitable expression in the appended claims, what
blade in elevated inoperative positions.
pared with devices now available, and, for mount
Referring to the drawings, the invention is por~
ing and guiding the trimmer blade, to utilize for
the most part present standard sewing machine trayed as embodied in a “walking foot” type of
Singer sewing machine, which has an usual head
Another object is to provide simple yet effec- « Iii, needle bar I2 and presser bar I4. The needle
tive connections for actuation of the trimmer bar and presser bar are mounted side by side in '
the head, for vertical reciprocation in timed reblade in timed relation to the sewing and work
lation by usual mechanism (not shown) Within
feeding functions of the machine.
the head. The needle I6 is carried at the lower
A further object is to provide means for the op
erator to throw the trimmer mechanism into and end of the needle bar; and the presser foot it is „ 30
carried at the lower end of the presser bar, forout of action, at will, without affecting the regu
co-acting with the corrugated feed dog 20 which
lar functions of the machine.
It is another feature that the bed plate for use works in the slot 86 in the flat bed plate 22 of the
with the trimmer can be made as a modification machine.
A walking foot 24 is mounted on the lower end 35
of one which is already available as a standard
of a bar 26 which hangs by gravity from its pivotal
mount at 28 on an L-shaped lever 3i). A leaf
For holding the trimmer blade, the inventio
provides a plate guided slidably on the presser spring 32 urges this bar forward so that its foot
bar of the machine, below the machine head. A 2d engages the presser foot I8, at the times when
second guide element may be fixed in the under the Walking foot is elevated with respect to the_« 40
face of the head, for combining with the presser work.
The Walking foot 24 and its suspension bar 2G
bar to maintain the plate in a horizontal plane,
and to ~hold it against turning. A latch link is are actuated in vertical directions by a crank arm
adapted to engage the plate operatively when the 34 on rock shaft 3B. Mechanism (not shown)
plate is pressed downward, so that the plate 'and within -head Ill, reaching out at the back of the .
its blade are reciprocated by the latch link which. head, rocks shaft 36 in timed relation to the move- `
is itself reciprocated by a link of the regular ments of the needle bar and presser bar. A link
33 connects crank arm 34 to one arm of the L
“walking foot” actuating mechanism. A disen
gaging of the latch lets a spring move the trimmer shaped lever 36, whose other arm is connected to
a block ¿lil which is secured to and carried by they
to its uppermost position where it is inoperative.
A bed plate of the sort used with trimmers on presser bar I4, and which is slidable vertically on
machines not of the “walking foot” type may be the fixed guide 42.
The foregoing is descriptive of mechanism
modified to suit our present requirements, by con
verting the rectangular feed slot to an inverted which is old and well known. In operation, the
L-shaped slot, and by providing a bracket on the >presser foot engages and holds the work between.Í
itself and the feed dog 20 while the needle pierces
the Work. As the needle is being elevated, the
walking foot 24 is moved downward into engage
ment with the work, and the presser foot I8 is ele
5 vated a little to disengage itself from the work.
Then the feed dog 20 moves rearward, and the
work is carried with it, pinched between the feed
dog and the walking foot which moves rearward
against its leaf spring 32. As the needle starts
10 downward, the presser foot I8 again engages the
Work, the walking foot 24 is lifted, and spring 32
swings it back to its forward position.
According to the invention, a horizontal plate
44 for carrying the trimmer blade 50 is mounted
15 below head i8 and can be adjusted vertically be
tween a depressed position as represented in Fig
ures 1-4, where it is operative through a range
of vertical travel, and an elevated position, as
seen in Figure 7, where it is inoperative. A con
20 venient arrangement is to mount plate 44 slid
ably on the presser bar I4, and on a short, ñxed
post 45 which is secured in the head to project
downward parallel to the presser bar. A coil
spring 48 tends to draw plate 44 to its upper in
25 operative position of Figure 7.
A trimmer blade 50 is secured on plate 44, ad
justably as` by the screws 52, the particular blade
shown being of a well known variety heretofore
used on other types of sewing machines. In the
30 upper position of plate 44, the blade 50 is elevated
well above the level of the work on bed plate 22.
The invention coordinates the operations of the
walking foot and trimmer so that the trimmer
blade, when depressed and connected for opera
35 tion, makes a downward cutting stroke each time
the walking foot is lifted from the work at the
end of each feed advance of the work. To this
end, a bell crank is pivoted at 54 on a ñXed part
of the head I8. One arm 56 of the bell crank is
40" secured to the link 38 at a mid-location 68, and
the other arm 52 of the bell crank is connect
ed at 64 to a latch-link 66 whose lower end eX
tends within a slot 68 (Figure 5) in plate 44. A
notch 'I8 near the lower end of the latch-link
45 is adapted to engage the rounded edge wall 'l2
of slot 58, thereby to connect the plate operatively
with the latch-link. A leaf spring 14 continually
urges latch-link G5 against said edge 12 so that,
when the plate 44 is moved downward, as by a
50 person pressing down on ñnger piece 16, the
latch-link snaps into plate engagement. The
plate and the trimmer blade 50 which it carries
are then reciprocated vertically by movements
of link 38.
The trimmer thus can function in timed rela
tion to the stitching and feeding of the work.
And, quite as important, the trimmer may be
thrown outl of service by means of handle '|8, by
merely disengaging latch-link 66.
Figure 6 shows in plan an improved bed plate
22 devised especially for coacting with the de
scribed trimmer attachment. It is provided with
a slot 88 which, as viewed from the front, is in
the shape of an inverted L, within the breadth of
65 whose longer limb the feed dog 28, the presser
foot I8 and the walking foot 24 may coact for
the holding and-for the feed, with the walking
foot extending laterally into the space occupied
by the broad sharter limb of the L. A trimmer
70 plate of a shape used on another type of sewing
machine, having a straight slot, may be modiñed
to suit the requirements, by removing a portion
of the adjacent metal strip 86 which is present
in that type, and by providing a bracket 82 on
75 the under face of the bed plate, with finger 84
for supporting the cut end, at what was the mid
dle, of this metal strip 86. A usual spring
pressed block 88 yields, as the blade is forced
down through the crack at 90, and meanwhile
yieldingly presses the trimmer blade against the
strip 86, for shearing action. The needle passes
down through hole 92 in strip 86.
The invention involves few parts and may be
embodied in standard sewing machines of well
known types without disturbing present mech 10
In Figure 6 the bed plate 22 is shown as it
would appear in plan when standing at the back
side of the machine, i. e., the slot has the de
scribed inverted L shape when viewed from the 15
front side of the machine.
We claim as our invention:
1. In a sewing machine having a work sup
port and stitch forming mechanism, with work
feeding mechanism and a head overhanging, in 20
cluding a presser bar with presser foot, a walking
foot, and actuating means therefor; the com
bination therewith of a trimmer blade having
mounting means slidable on the presser bar below
the said head; means for connecting said blade 25
to said actuating means at the will of the opera
tor, for reciprocating the trimmer blade in timed
relation to the action of said work-feeding mech
2. In a sewing machine having a work support 30
and stitch forming mechanism, with work-feeding
mechanism and a head overhanging, including a
presser bar with presser foot, a walking foot, and
therewith of a plate mounted slidably on the 35
presser bar, below the said head; a trimmer
blade ñxed on said plate; means for connecting
said plate to said actuating means at the will of
the operator, for reciprocating the trimmer blade
in timed relation to the action of said work-feed 40
ing mechanism.
3. A sewing machine as in claim l, wherein the
said connecting means is a lever pivoted on said
head and having one arm connected to said ac
_tuating means; and means at the other arm of
said lever for operative connection to the slidable
4. A sewing machine as in claim 2 wherein the
said plate is ,yieldingly held by a spring in an ele
vated inoperative position, and wherein said con 50
necting means is a lever pivoted on said head and
having one arm connected to said actuating
means, and its other arm carrying a latch-link
suspended and spring-pressed into sliding en
gagement with an edge of said plate; said latch
link having a notch therein adapted to move into
latching engagement with the plate when said
plate is depressed to latch-engaging level.
5. A sewing machine as claim 1 wherein said
mounting means for the trimmer blade is addi 60
tionally guided by a guide post projecting down
ward from said head in parallelism with said
presser bar.
6. A sewing machine having a head, a presser
bar with presser-foot mounted for reciprocation
in the head, a trimmer blade, a guide post pro
jecting from said head, at a distance from said
presser bar and parallel thereto, a carrier for
said blade mounted slidably on said presser bar
and said post, and means, actuated in timed rela
tion to said presser bar, adapted for'actuating
connection to said blade carrier, whereby the said
blade carrier moves in timed relation to the
presser bar.
7. A sewing machine as in claim 1 wherein the
machine has a flat bed with a ñat bed plate
which has an inverted L~shaped slot for accom
modating the feed dog and Walking foot, and has
a bar set along the vertical limb of the L, hav
ing a hole for passage of the needle, said bar con
stituting one blade of a shear, and ending with
in the inner angle of said L, and wherein the un
der side of said bed plate has a bracket sustain
ing the end of the shear bar, and the upper side
10 of said bed has, in the plane of the shear bar, a
block yieldingly urged laterally against said shear
bar, said block having a groove in its edge for
reception of the leading end of said trimmer
blade between said block and said bar, with said
block yielding away from the shear bar as the 5
blade moves downward, whereby said block
presses said blade into shearing relation with said
shear bar.
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