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Патент USA US2108138

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Feb. 15, 1938.
'
R. s. PAINTER
'
, 2,108,138
SEWING AND TRIMMING MACHINE
Filed Feb. 27, 1936
4 Sheets-Sheet 1 ‘
Feb. 215, 1938.
R. s. PAINTER
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2,108,138
SEWING AND TRIMMING MACHINE
Filled Feb. 27, 1956
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R. s. PAINTER
SEWING AND TRIMMING MACHINE
Filed Feb; 27, 1936
4 Sheets-Sheet 5
Patented Feb. 15, 1938
2,18,138
UNITED STATES PATENT OFFICE
2,108,138
SEWING AND TRIM'M'ING MACHINE‘
Roy Stanley Painter, Hannibal, Mo., assignor to
The Singer Manufacturing Company, Elizabeth,
N. J ., a corporation of New Jersey
Application February 27, 1936, Serial No. 66,012
14 Claims. (Cl. 112-127)
This invention relates to improvements in nected by the usual link 9 with a needle-bar H!
trimmer mechanisms and more particularly to carrying at its lower end a needle I i, said needle
trimmer mechanisms of sewing machines, the in
bar i0 being journaled for vertical reciprocation
vention having for its primary object to provide a in suitable bearings provided in the bracket-arm
sewing machine with an ei?cient and commer
head 5. The needle H cooperates, in the forma- 5
cially practical trimmer mechanism adapted to tion of lock-stitches, with the usual loop-taker I2
effect the production of smoothly trimmed and disposed within the frame-post 2.
sharply curved edges in work, conjointly with
The work is intermittently advanced by a drop
the stitching operation.
feed mechanism including a feed-bar l3 disposed
A more speci?c object of the present invention vertically within the post 2 and carrying at its 10
is to improve the quality of the product obtained upper end a feed-dog M. The feed-dog 14
by the use of sewing machines ?tted for simul
operates through a suitably slotted throat-plate
taneously stitching the edges and undertrimming l5 secured upon the post 2 and is opposed in its
the linings of shoes, etc.
rising movement by a presser-roller it closely
Another object of this invention is to provide adjacent to and at one side of the path of needle- 1.5
a work~severing trimming machine having a reciprocation. The presser-roller I6 is carried
work-feeding mechanism with means for con
by the lower end of the usual spring-depressed
trolling the relative speeds of operation of the presser-bar ll journaled for vertical movements
work-feeding and work-severing mechanisms.
in suitable bearings provided in the bracket-arm
With the above and other objects in view, as head
20
20
will hereinafter appear, the invention comprises
Depending from the under side of the bracket
the devices, combinations and arrangements of arm 4 is a frame-boss l8 provided with a flattened
parts hereinafter described in connection with lower face affording a seat for a trimmer-bracket
the accompanying drawings, in which:
l9 ?xedly secured to said boss by screws 20.
(0 LI
Fig. 1 is a rear side elevation, partly in section, Journaled in suitable bearings provided upon the 25
of a sewing machine provided with the improved trimmer-bracket I9 for endwise reciprocation in
trimmer-actuating mechanism. Fig. 2 is a front a vertically inclined path is a knife-bar 2| carry
end elevation, partly in section, showing the ing, at its lower end, a knife-holder 22 to which
bracket-arm and work-supporting post of the a Work-severing element in the form of a
130 sewing machine. Fig. 3 represents a top plan
straight-edge trimmer-knife 23 is secured by 30
view of the sewing machine, with the bracket
screws 24. While the cutting edge of the knife
arm shown in longitudinal section. Fig. 4 is a is straight, it is preferably inclined downwardly
detail view in side elevation of a portion of the in the direction of feed, as illustrated in dotted
trimmer-knife actuator bar and its driving stud. lines in Fig. 2 of the drawings. The trimmer
Fig. 5 represents a rear side elevation of the knife 23 has a path of movement to sever the 35
sewing machine mounted upon a supporting table Work substantially parallel to the line of seam
provided at the under side thereof with a treadle
formation and at the side of the needle I l oppo
controlled electric-transmitter for driving the site to the presser-roller Hi. The movement of
sewing machine, certain parts of the sewing ma
the trimmer-knife in a vertically inclined path
40 chine being omitted.
transverse to the plane of the work results in the 40
Referring to the drawings, the present inven
production of undercut trimmed edges and, ac
tion is illustrated as embodied in. the commer
cordingly, in the trimming of shoe linings the
cially well known Singer No. 51W56 sewing and trimmed edge of the lining is concealed by the
underedge-trimming machine. This sewing ma
beveled edge of the shoe-upper, as is well under
45 chine has a frame comprising a, bed-plate I,
stood in the art.
45
from one end of which rises a work-supporting
post 2. Upon the opposite end of the bed-plate
I is the supporting standard 3 of a bracket-arm 4
which terminates at its free end in a head 5 over
hanging the work-supporting post 2.
Journaled in the bracket-arm 4 is a horizon
tally disposed main actuating shaft 6 carrying at
one end a combined belt-pulley and balance
wheel ‘I. At its opposite end, the main shaft 6 is
5;, provided with a crank-disk 8 operatively con
As heretofore constructed, the underedge cut
ting trimmer-knife has usually been actuated
from the main shaft of the sewing machine to
reciprocate once for each needle reciprocation.
When stitching and trimming in sharp curves, 50
occurring particularly in shoe production, the
work is not only advanced by the feeding mecha
nism of the machine but is also sharply turned
by the operator between successive reciprocations
Of the trimmer-knife, according to the desired 55
2
2,108,138
work-edge outline. As a consequence, successive
straight cuts made by the trimmer-knife intersect
each other at an angle and the trimmed edge
of the work presents an objectionable appearance.
It has been heretofore proposed to overcome this
dif?culty by reciprocating the trimmer-knife
twice for each needle-reciprocation, by the pro
vision of suitable actuating connections with the
main shaft of the machine, but this proposal has
20
N) Cal
30
motor 49. The eccentric 41 is elongated to pro
vide for the requisite sliding movement of the
fork of the rock~arm ‘25 upon said eccentric
when the rock-shaft 33 is shifted endwise to dis
connect the coupling pin (it from the actuator
bar 28.
The electric-motor 48 is disposed so that its
rotor~shaft is substantially parallel to and pref
erably at substantially the same level as the main
shaft 5 of the sewing machine, said electric ll)
proven unsatisfactory for several reasons and
particularly because of the lack of durability of motor being mounted upon a suitable bracket 59
the trimmer mechanism when operated at twice ' secured by screws 5!. upon the rearward side of
the frequency of the needle reciprocations at the ' the machine bracket-arm (l. The electric-motor
higher speeds of operation of the sewing machine. has the usual current-controlling switch 52 and
derives its power from
suitable source,
The present invention obviates the diiiiculties in
through current leads 53, so that the electric
herent in the prior known arrangements in a
motor may be operated independently of the op
simple and novel manner,
eration of the sewing machine. A guard-bracket
Suitably secured upon the knife-bar 21 is a
54 houses the eccentric 4i and the forked end of
collar 25 pivot-ally connected by a link 28 to an
the rock-arm llli, said guard-bracket having a
arm 2? of a bracket rigidly carried by the lower
supporting shank 55 secured by screws, as 5'5,
end of an actuator bar 28. The actuator bar 23
upon the ?attened upper face of the bearing-lug
is con?ned to vertical reciprocation in suitable
guide-slots 29 provided in the bracket-arm head 31% which is adjacent to the rock-arm 46.
The sewing machine is preferably mounted
5, said bar 28 having in its outer edge a notch
36 adapted to receive a coupling-pin. 3!. The upon a supporting table at the under side of
coupling-pin 3! is carried by the free end of a which is disposed sewing machine driving means
crank~arm
extending horizontally forward of any usual or suitable character. As illustrated
in Fig. 5 of the drawings, this sewing machine
from one end of a rock-shaft 33 disposed sub
driving means may comprise an electric-trans
stantially parallel to the main shaft 5, said rock
mitter having a supporting frame 5'! suitably 30
shaft 33 being journaled for rocking and end
secured to the under side of the machine-sup
wise movements in bearing-lugs 3ft upon the
machine bracket-arm, at the rearward side porting table 58. Carried by said frame 51 is an
electric motor 59 having a rotor-shaft 60 upon
thereof.
At its end opposite to the crank-arm 32, the which is secured a driving clutch-member 6| for
rotation therewith. Adapted to frictionally en
rock-shaft 33 has a circumferential groove 35
gage the driving clutch member 6| is a driven
embraced by a suitably notched car 36 upon one
arm 31' of
angular hand-lever 3?, 38. The clutch-member 52 which is peripherally grooved
hand-lever 3'1, 38 is pivotally mounted upon a to form a belt-pulley connected by a belt 63 with
horizontally disposed fulcrum-screw 39 extending the pulley ‘i of the sewing machine. The driven
transversely of the main shaft 6 and threaded clutch-member 62 may be shifted endwise of the 40
rotor-shaft 69, into frictional engagement with
into a boss llil upon the machine bracket-arm G.
The arm 3? of the hand-lever depends below the the driving clutch-member 6!, by a lever 64 piv
bracket-arm 4 so as to be conveniently accessible otally mounted upon an arm 65 extending from
from the front side of the machine, while the the transmitter-frame 5?. The lever 64 is con
nected by an adjustable rod 66 to a suitable
arm 38 of said lever is acted upon by a spring 4!
to yieldingly shift the rock-shaft 33 in a direction treadle 81. By operation of the treadle 61, the
to effect driving engagement by the coupling pin lever Gil may be actuated against the action of a
3i with the actuator bar 28. A coil-spring £52 has spring 68 to bring the clutch~member 62 into
its opposite ends connected to the bracket-arm I3 frictional engagement with the clutch-member
and to the knife-bar 2i to retract said knife-bar 6!, thereby to drive the sewing machine. The,
speed of operation of the sewing machine may,
and thereby to raise the actuator-bar 28 into in
operative positions of said bars, when the hand
lever 3'5, 33 is operated to disconnect the cou
pling-pin 3i from the actuator-bar 28.
Pivctally mounted upon the trimmer-bracket
i9 is a hand-lever as which is yieldingly held in
inoperative position by a spring M. The upper
end of this lever 153 has a lateral extension 155
adapted, upon operation of said lever, to engage
the upper end of the knife-bar 2i and to depress
said knife-bar against the action of the spring
42. Being connected to the knife-bar M, the
actuator-bar 23 is likewise depressed by opera
tion of the hand-lever 43, until the notch 39 of
the bar 28 is in alinement with the coupling-pin
3|, whereupon said coupling-pin enters the notch
39 under the influence of the spring 4|. It will,
therefore, be understood that the trimmer-knife
carrying bar I?! may be connected to and discon
' nected from the rock-shaft 33 at the will of the
operator during the operation of the machine.
Extending rearwardly from the rock-shaft 33’
and rigidly secured thereto is a rock~arm 136
having a forked free end embracing an eccentric
. 4‘! carried by the rotor-shaft 4-8 of an electric
of course, be varied by permitting slippage be
tween said clutch-members. It is to be under
stood, however, that the present invention is not
limited to the speci?c form of sewing machine
driving means described, as any other suitable
speed-controlling power transmitting device may
be employed.
From the foregoing description, it will be under
stood that when the electricemotor L19 is in opera
tion, the rock-shaft 3;’; derives rocking movements
from the eccentric All carried by the rotor-shaft
d8 of the electric-motor. Upon operation of the
hand-lever 5-3, the actuator~bar 28 is coupled to
the crank-arm
of said rock-shaft, thereby
transmitting reciprocatory movements to the
knife-bar 2i which may, at will, be disconnected
from its actuating mechanism by manipulation
of the hand-lever 3?, 38.
The rotor-shaft d8 of the electric-motor $19 ro
tates at a substantially constant speed, prefer~
ably at least equal to the maximum speed of rota
tion of the main shaft 6 of the sewing machine.
Therefore, when the sewing machine is operated
at maximum speed and the motor 559 is running,
2,108,138
3
the trimmer-knife 23 reciprocates once for each
needle reciprocation. However, it is only in sub
reciprocated from said shaft, of a trimmer mech
anism comprising a reciprocatory trimmer-ele
stantially straight line stitching that the sewing ‘ment having effective work-severing movements
machine is operated at maximum speed. As the adjacent said needle, a rotary actuating shaft dis
Cir work is not sharply turned during substantially
posed substantially parallel to and rotatable in
straight stitching operations, the successive
straight cuts performed by the trimmer-knife 23
are in alinement or so nearly in alinement that
the trimmed edge of the work presents a smooth
10 appearance.
On the other hand, the stitching of sharp curves
is necessarily performed at slow speeds of opera
tion of the sewing machine and, at such slower
speeds, the trimmer-knife of the present invention
continues to operate at the same speed as before.
For example, if the trimmer-knife performs 2800
reciprocaticns per minute and the sewing machine
is operated at a speed of 400 stitches per minute,
the trimmer-knife will have seven work-severing
20 strokes for each needle reciprocation. Conse
quently, when the work is sharply turned by the
operator at the slower speeds of operation of the
sewing machine, the intersections of successive
cuts performed by the trimmer-knife approach
each other so closely that smooth trimming is
maintained. The present improvement therefore
provides means for actuating the stitch-forming
and trimming mechanisms at speeds having a
ratio variable at will during the operation of the
30 machine.
Sewing machines of the present type are often
used merely for stitching operations and, for this
purpose, it has heretofore been the usual practice
to throw the trimmer-knife out of operation by
means of the hand-lever 3'5, 38, leaving in opera
tion the portion of the trimmer mechanism in
cluding the actuating eccentric and the fork em
braced thereby. While the present arrangement
includes this trimmer throw-out expedient, it
40 need only be used when changing frequently from
trimming to non-trimming operations. For any
extended periods of operation of the sewing ma
chine during which the trimming mechanism is
not used, the operation of the electric-motor 49
45 may be discontinued, thereby minimizing wear of
the eccentric it‘! and the fork of the rock-arm 46
embracing said eccentric.
If the sewing machine needle is omitted, the
machine is adapted for trimming purposes alone.
In this case, the speed of effective action of the
feeding mechanism of the machine may likewise
be varied at will relative to the frequency of re
ciprocation of the trimmer-knife, to provide for
smoothly severing sharply curved work by means
of a machine adapted to trim straight runs at high
dependently of said needle-reciprocating shaft,
and operative connections with said actuating
shaft for reciprocating said trimmer-element.
3. The combination with a sewing machine hav
ing a work-support, stitch-forming mechanism 10
including a reciprocatory needle and work-feeding
mechanism, of a trimmer mechanism including a
trimmer-element having Work-severing move
ments adjacent said needle in a path inclined
vertically to said work-support, and means oper
able independently of said stitch-forming and
Work-feeding mechanism for reciprocating said
trimmer-element.
4. In a sewing machine, the combination with
simultaneously
operable
stitch-forming
and
Work-trimming mechanisms, of means for actu
ating said mechanisms at relative speeds having
ratio variable at will during the operation of
said machine, and means operable at will during
the operation of the machine for interrupting
the effective action of said work-trimming mech
anism.
5. The combination with a sewing machine
having a reciprocatory needle and needle-recip
rocating mechanism, of a trimmer mechanism
including a trimmer-element having effective
work~severing movements adjacent said needle,
means operable independently of said needle-re
ciprocating mechanism for actuating said trim
mer mechanism, and means operable at will dur
ing the operation of the machine for substan
tially instantaneously interrupting the effective
action of said trimmer mechanism.
6. In a sewing machine, the combination with
simultaneously
operable
stitch-forming
and
work-severing movements adjacent said needle,
an electric motor operable independently of said
needle-reciprocating mechanism, and operative
connections with said electric motor for recip
speed.
rocating said knife.
As illustrated in the accompanying drawings,
the trimmer mechanism assembly includes the
usual edge-guide and adjusting devices, which
8. The combination with a sewing machine
having a needle-reciprocating mechanism, of a
60 are, however, not herein referred to in detail, as
a description thereof is considered unessential to
an understanding of the present invention.
Having thus set forth the nature of the inven
tion, what I claim herein is:—
1. The combination with a sewing machine hav
ing a reciprocatory needle and needle-reciprocat
ing mechanism, of a trimmer mechanism includ
ing a reciprocatory knife having effective work
severing movements adjacent said needle, and
means operable independently of said needle-re
ciprocating mechanism for reciprocating said
knife.
2. The combination with a sewing machine
having stitch-forming mechanism including a
75 rotary needle-reciprocating shaft and a needle
40
work-trimming mechanisms, of means for actu
ating said mechanisms at relative speeds having
a ratio variable at will during the operation of
said machine, and means operable at will dur
ing the operation of the machine for throwing 45
said work-trimming mechanism out of and into
effective action.
7. The combination with a sewing machine
having a reciprocatory needle and needle-recip
rocating mechanism, of a trimmer mechanism
including a reciprocatory knife having effective
reciprocatory trimmer-element,_an electric m0
tor having a rotor-shaft operable independently 60
of said needle-reciprocating mechanism, an ec
centric carried by said rotor-shaft, and actuating
connections for reciprocating said trimmer-ele
ment from said eccentric.
9. The combination with a sewing machine 65
having a frame and a needle-reciprocating mech
anism mounted upon said frame, of a recipro
catory trimmer-knife carrier mounted upon said
frame, an electric motor mounted upon said
frame and operable independently of said needle 70
reciprocating mechanism, and operative connec
tions with said electric motor for reciprocating
said trimmer-knife.
10. The combination with a sewing machine
having stitch-forming mechanism including a 75
2,108,138
rotary needle-reciprocating shaft and a needle
reciprocated from said shaft, of a trimmer mech
anism comprising a reciprocatory trimmer-ele
Cl
10
ment having effective work-severing movements
adjacent said needle, an electric motor having
a rotor shaft disposed substantially parallel to
and operable independently of said needle-recip
rocating shaft, and means for reciprocating said
element from said rotor-shaft.
11. The combination with a sewing machine
having a reciprocatory needle and needle-recip
rocating mechanism, of a trimmer mechanism
including a trimmer-element having effective
work-severing movements adjacent said needle,
15 an electric motor operable independently of said
needle-reciprocating mechanism, operative con
nections with said electric motor for actuating
said trimmer mechanism, and means operable at
will during the operation of said electric motor
for substantially instantaneously interrupting
the effective action of said operative connections.
12. The combination with a sewing machine
having a frame including a work-support and
a bracket-arm overhanging said work-support,
25 a rotary needle-reciprocating shaft journaled in
said bracket-arm, a vertically reciprocatory nee
dle actuated from said shaft, and work-feeding
mechanism, of a trimmer mechanism supported
by said bracket-arm and comprising a recipro
catory trimmer-element having a work-severing
path of movement adjacent to and inclined ver
tically to the path of needle reciprocation, an
electric motor operable independently of and
having a rotor-shaft disposed substantially par
allel to said needle-reciprocating shaft, a rock
shaft, means for imparting rocking movements
to said rock-shaft from said rotor-shaft, and
means connected to said rock-shaft and discon~
nect-ible therefrom at will during the operation
of the machine for reciprocating said trimmer
element.
13. In a sewing machine, in combination, a
reciprocatory needle and a reciprocatory work~
severing trimmer-element adapted to be oper 15
ated at a variable ratio of reciprocation-fre
quencies, means for reciprocating said needle,
means for reciprocating said trimmer-element,
and means for varying said ratio comprising con
trolling means for operating said sewing machine
at di?erent speeds.
14. The combination with a sewing machine
having a reciprocatory needle, of a trimming
mechanism including a reciprocatory work-sev
ering element, variable-speed driving means for 25
controlling the frequency of reciprocation of said
needle, and substantially constant-speed driving
means for reciprocating said element.
ROY STANLEY PAINTER.
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