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Патент USA US2105346

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Jan. 11, 1938.
Filed May 12, 1936
3' Sheets-Sheet l
Jan. 11, 1938.
Filed May 12, 1936
3 Sheets-Sheet 2
?ederio 1”. Card
Jan. 11, 1938.
Filed May 12, 1936
3 Sheets-$11691; 3
3 ‘W"M5
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Patented Jan. 11, 1938
Frederic M. Card, Bridgeport, Conn., assignor to
The Singer Manufacturing Company, Eliza
beth, N. J., a corporation of New Jersey
Application May 12, 1936, Serial No. 79,231 '
. 4 Claims.
This invention relates to improvements in trim
mer mechanisms and more particularly in trim
mer mechanisms of sewing machines, the inven
_ tion having for its primary object to provide
a . durable actuating means for a trimmer mecha
nism adapted to effect the production of smoothly
trimmed and sharply curved work-edges.
With the above and other objects in view, as
will hereinafter appear, the invention comprises
1 0 5the devices, combinations and arrangements of
parts hereinafter described in connection with
the accompanying drawings which illustrate a
preferred embodiment of the invention and in'
P which?
Fig. 1 is a rear side elevation, partly in section,
(Cl. 112-127)
frame I | swings about an axis in parallelism with
the axis of rotation of the main shaft 6. Swing
ing movements are imparted to the frame H by
a crank-arm l3 at one end of a rock-shaft l4,
journaled horizontally in the bracket-arm 4, as
more fully illustrated and described in U. S. Pat
ent No. 1,884,404, Oct. 25, 1932, W. C. VanNess
et al. The needle |ll cooperates, in the formation
of lock-stitches, with the usual loop-taker (not
shown) disposed within the upper end of the 10
frame post 2.
In the operation of the sewing machine, the
work is continuously advanced by a feed-wheel
l5 projecting through a suitably slotted throat
plate l6 secured upon the upper end of the work 15
of a sewing machine provided with the improved
supporting post 2, the line of feed lying in the
trimmer-actuating mechanism.
vertical plane of lateral movement of the needle
H1. The feed-wheel |5 may be rotated by any
Fig. 2 is an en
larged front end elevation, of the machine, partly
in section. Fig. 3 is a detail view in elevation
20 of the trimmer-knife throw-in lever. Fig. 4 is
a top plan view, partly in horizontal section, of
the sewing machine and the trimmer-actuating
mechanism combined therewith. Fig. 5 repre
sents a substantially vertical section of the coun
25 ter-shaft crank and pitman. Fig. 6 represents
a longitudinal section of the crank-actuated pit
man, taken substantially on the line 6—6 of Fig.
5. Fig. '7 represents a transverse section of the
pitman, taken substantially on the line '|—'| of
30 Fig. 6.
The present invention constitutes an improve
ment in the trimmer-actuating mechanism of
the pending U. S. patent application of Roy
Painter, Serial No. 66,012, ?led Feb. 27, 1936. Re:
35 ferring to the drawings, the improved trimmer
actuating mechanism is illustrated as embodied
in a sewing machine having a frame comprising
a bed-plate I, from one end of which rises a work
supporting post 2. Upon the opposite end of the
40 bed-plate | is the supporting standard 3 of a
bracket-arm 4 which terminates at its free end
in a head 5 overhanging the work-supporting
post 2.
Rotatably journaled in the bracket-arm 4 is a
4 (21 horizontally disposed main actuating shaft 6
carrying at one end a combined belt-pulley and
balance-wheel 1. At itsopposite end, the main
shaft 6 is provided with a crank-disk 8 oper
atively connected to reciprocate a vertically dis
50 posed needle-bar 9 carrying at its lower end a
needle Ill. The needle-bar 9 is journaled for
endwise reciprocation in suitable bearings pro
vided in a swinging frame || pivotally hung at
its upper end upon a fulcrum-pin l2 suitably se
55 cured in the bracket-arm head 5 so that the
suitable actuating mechanism, the present feed~
wheel actuating mechanism being similar to that
disclosed in the above noted U. S. Patent No.
1,884,404. It will be understood that the needle
I0, while-in the work, moves laterally in the di
rection of feed and that the return movements
of the needle are effected while out of the work,
so that the feeding of the Work is assisted by the
needle. Opposed to the feed-wheel is a presser
roller |‘| closely adjacent to and at one side of
the plane of needle-reciprocation, said presser
roller being carried by the lower end of the usual
spring-depressed presser-bar |8 journaled for
vertical movements in the bracket-arm head 5.
Secured, by screws l9, to the under side of the
bracket-arm 4 is a trimmer bracket 20, providing
bearings in which a knife-bar 2| is journaled for
endwise reciprocation in a vertically inclined
path. Carried by the lower end of the knife-bar
2| is a knife-holder 22 to which a work-severing
element in the form of a straight-edge trimmer
knife 23 is secured by screws 24. While the cut- 40
ting edge of the knife is straight, it is preferably
inclined downwardly in the direction of feed,
as illustrated in dotted lines in Fig. 2 of the
drawings. The trimmer-knife 23 has a path of
movement to sever the work substantially par
allel to the line of seam formation and at the side
of the path of the needle opposite to the presser
roller |‘|.
Suitably secured upon the knife-bar 2| is a
collar 25 pivotally connected by a link 26 to an 50
arm 21 of a bracket carried by the lower end of
an actuator-bar 28.
The actuator-bar 28 is con
?ned to vertical reciprocation in suitable guide
slots provided in the bracket-arm head 5, said P
bar 28 having in its outer edge a notch 30 adapt- "0
ed to receive a coupling-pin 3|. The coupling
pin 3| is carried by the free end of a crank-arm
32 extending horizontally forward from one end
of a rock-shaft 33 disposed substantially parallel
Extending rearwardly from the rock-shaft 33
and rigidly secured thereto is a forked rock-arm
55, the spaced members 5| and 52 of which are
provided with horizontally alined apertures slid- ,
ably receiving a pin 53 disposed substantially
to the main shaft 6, said rock-shaft 33 being
journaled for rocking and endwise movements in
bearing-lugs 34 upon the machine bracket-arm,
parallel to the rock-shaft 33. The pin 53 has a
longitudinal bore 54 preferably receiving a Wick
at the rearward side thereof.’
55, said bore 54 being intersected .bycagplural
ity of radial ducts 56 provided in said pin. to
10 rock-'shaft 33 has a circumferential groove 35 ' conduct lubricant to the bearing faces in the 10
embraced by a suitably notched ear 36 upon a 1_ rock-arm members 5| and 52 for the pin 53.
Rigidly secured by a screw 51 upon the slide
trimmer throw-out hand-lever 3?.
I _ hand
lever 31 is pivotally mountedupon a horizon ‘pin 53,‘ between the rock-arm members 5|, 52,
is the apertured lower end of a vertically dis
tally disposed fulcrum-screw 39 extending trans
15 versely of the main shaft 6 and threaded into a, posed pitman 58. At its opposite end, the pit 15
At its end opposite to the crank-arm 32, the
boss 40 upon the machine bracket-arm 4;.- The
hand-lever 3'! depends below the bracket-arm
vman 58 is apertured to pivotally embrace a crank~
pin 59, extending from a crank-disk 65 at one end
4 so as to be conveniently accessible fromthe 1‘ of a rotary counter-shaft 6|.
front side of the machine, said hand-lever be
ing spring biased in a direction to releasably hold
the coupling pin 3| in the notch’ 35 of the ac-.
tuator-bar 28. A coil-spring 4| has its-opposite
ends connected to the bracket-arm- 6 and to: the
knife-bar 2| to’ retract said knifeebar- from op
25 erative position and thereby to- raise the actua
The pitman 58 is
_,restrained against movement endwise of the
crank-pin 59 by a collar 62 suitably secured‘upon
said crank-pin Thecounter-shaft 6| is‘ disposed
substantially parallel to the ' main shaft" 6; and;
is journaled in ?anged bearing-bushings 63 and.
54 suitably secured in horizontally apertured lugs‘
to disconnect the coupling-pin fromv the actua
65 and 66 of a bearing-bracket 6'|.v The bracket 25
67 is secured by screws 68 upon the machine.
bracket-arm’ 74 so that the counter-shaft bears
tor-bar 28.
ing lugs of said bracket 61 extend rearwardly
tor-bar 28 when‘ the hand-‘lever 3'! is operated
Suitably secured upon the trimmer-bracket-ZB,
at the rearward side thereof, is an auxiliary
from the bracket-arm 4.
bracket-plate 26' havingits upper end‘spaced
ter-shaft 6| is a groovedpulley69= connected
by a belt 16 to a pulley '|| carried by the ro-"
tor-shaft 12 of an electric motor 13... Theelec
from the bracketZll to receive'therebetween a
throw-in hand-lever for the trimmer-knife. This
hand-lever comprises complemental leverV-"rnem-v
' bers 42, 43 ‘pivotally mounted adjacent each oth
er uponastud-bolt 44.
The member 42 has a
Suitably secured upon one: end of the coun
trio motor 13 is mounted upon a bracket ;14_>se-.
cured by screws 15 uponzthe' rearward side of
the supporting standard 3 of‘ the sewing‘ ma
laterally offset extension 45‘ overhanging the up
chine bracket-arm, said electric motor 13 being
per end of the lever-member 43 and to this ex;
preferably provided with an electric-currentcon
trolling switch 16.7 The pulleys 69' and "H are
preferably proportioned so that thecounter-shaft 40
6| is rotated at a lower rate ofv speed than
the speed of rotation of the rotor-shaft 12;
In order to supply lubricant to the counter.
shaft bearings, the bracket-lugs 65~and 66: are
each provided with upstanding and vertically 45
tension is suitably secured'a bentspring/ 46 bear,
40 ing against the lever-member 43 below the piv
otal axisthereof; said spring 46 functioning to
yieldingly hold the lever-members 42, 43 against
relative movement. The. lever-member 43 of said
hand~lever is yieldingly- held by a spring ‘ (3?
against a fixed stop-pin 43 extending inwardly
from the bracket-plate Zll'and determining: the
normal inoperative position of the hand-lever 62,
43. The offset extension. 45' of the lever-mem
ber .42 is‘ adapted to engagethe upper end of
50 the knife-bar '2|~ upon operation of the hand
lever 42, 43 and, as the bent spring 46 isstrong
er than the spring 41, the knife-bar 2! may be
depressed by said hand-lever until the coupling
pin 3| enters the notch 38 in theactuator-bar 23.
However, as theVthrow-in movement-cf the
knife-bar 2;! serves to initiate reciprocation. of
theactuator-bar 28 by the rock-shaft 33,‘ the
rapidly succeeding’ rising movement of the knife
bar 2| with the actuator-bar 28 reacts against
60 the hand-lever extension 45 before the member
. 43‘ of the hand-lever can be released by the op
It is at this time, primarily, that the
spring 46 functions to permit the member 52
of the hand-lever to-yield relatively to the mem
ber 43, thereby absorbing the vibratory action
apertured bosses ‘H, the apertures 18>in'said
bosses (Fig. 5) being alined with lug-apertures
79 forming lubricant’ wells below the bushing.;
apertures in said lugs. Each bushing’ 63011 64,
is diametrically apertured to provide a restricted 50
duct- 86, connecting the boss-aperture. 18' with
the shaft-bearingv face of the bushing, and a
larger duct 8| alined with'thelug-well 19. Pref
erably, a wick 82 is disposed in thenwell 19; and
extends throughthe bushing-duct 8| into’ con 55
tact’ with the counter-shaft’ 6|. VThe boss-ap
erture 18 is yieldingly closedyat its upper end
by a suitable spring-pressed valve 83,v while the
bushing, 63 or 64, is provided in itsshaft-bear
ing face withintersecting spiralgrooves 84. , Oil 60
introduced i-ntothe boss-aperture 18, through
the valve 83, passes through the'ducts 80 and
8| into the well 19, from which it is conducted
by the wick 82 to the shaft and is distributed by
the bushing-grooves.“ lengthwise andcircum 65
that would otherwise be transmitted to the hand
ferentially of the shaft-bearing face of the bush
of the operator. The hand-lever member 43 is,
inthe present instance, provided with a headed
stud 49 which serves as a steadying guide for
of with a bore 85 (Fig. 6) of which the upper
end is enlarged to form a reservoir 86 adjacent 70
the lower arm of the member 52 of saidhand
From the foregoing description it will
be understood that the trimmer-knife carrying
bar 2| maybe connected to and disconnected
from the rock-shaft 33 at the will of the opera-_
tor during'the operation of the machine. >
The pitman 58 is provided longitudinally there
the cranképin 59. Intersecting. the lower por-_
tion of the reservoir 86 is a transverse pitman;
bore 87 conneoting'said reservoirwith the crank
pin bearing face of the. pitman. Disposed in the
transverse bore 81 is a wick 88in wipingengage 75
ment with the crank-pin 59. The upper end of
the reservoir is, preferably, yieldingly closed by
a spring-pressed valve 89, while the lower end
of the pitman-bore 85 is alined with a radial
duct 90 provided in the tubular slide-pin 53.
Partly embracing the crank and pitman con
nection between the counter-shaft GI and the
rock-arm members 5|, 52, is an oil-guard bracket
9| which is substantially C-shaped in vertical
10 section, said bracket having a laterally extending
shank 92 secured by screws 93 to the under side
of the bracket-lug 65. The lower portion of the
bracket 9| has side walls 9|’, thereby to provide
a well for collecting lubricant thrown off by the
15 actuating mechanism embraced by the bracket.
From the foregoing description, it will be un
derstood that when the electric motor 13 is in
operation, the rocker comprising the rock-shaft
33 and its crank-arms 32 and 50 is continuously
20 actuated, the reciprocation of the trimmer-knife
23 being dependent upon whether or not the cou
pling pin 3! is in operative engagement with the
actuator-bar 28. By swinging the hand-lever 31
to the right, as viewed in Fig. 1, the rock-shaft
25 33 is shifted endwise to disconnect the coupling
pin 3| from the actuator-bar 28. The slide-pin
53 connection between the pitman 58 and the
rock-arm 50 leaves the pitman 58 unaffected by
the endwise movements of the rock-shaft 33.
It will be further understood that the trimmer
knife 23 may be rendered inoperative by discon
necting the electric motor 13 from its source of
power, whereby the sewing machine may be op
35 erated without actuating any portion of the
trimmer mechanism. On the other hand, the
trimmer mechanism and the work-feeding mech
anism of the sewing machine may be caused to
operate conjointly, without stitching, by merely
40 removing the needle 10 from the needle-bar.
Having thus set forth the nature of the inven
tion, what I claim herein is:-—
1. The combination with a sewing machine
having a rotary actuating shaft, and stitch-form
ing mechanism deriving actuation from said
shaft, of a trimmer mechanism comprising a re
ciprocatory trimmer-knife actuating bar, a driv
ing shaft rotatable independently of said sewing
machine actuating shaft, a counter-shaft opera
tively connected to rotate with said driving shaft,
a two-armed rocker having one arm operatively
connected to said trimmer-knife actuating bar,
an actuating member pivotally connected to the
other arm of said rocker, and means carried by
said counter-shaft for actuating said member.
2. The combination with a sewing machine
having a rotary actuating shaft, and stitch-form
ing mechanism deriving actuation from said 5
shaft, of a trimmer mechanism comprising a re
ciprocatory trimmer-knife actuating bar, an elec
trio-motor operable independently of said sew
ing machine actuating shaft, a counter-shaft,
driving connections for rotating said counter
shaft from said electric motor, a crank-member
carried by said counter-shaft, a rock-shaft hav
ing a plurality of crank-arms, one of.said crank
arms being operatively connected to said trim
mer-knife actuating bar, and a pitman connect 15
ing the counter-shaft crank-member and the
other arm of said rock-shaft.
3. The combination with a sewing machine
having a rotary actuating shaft, and stitch-form
ing mechanism deriving actuation from said
shaft, of a trimmer mechanism comprising a
reciprocatory trimmer-knife actuating bar, a
rocker shiftable lengthwise of its pivotal axis into
and out of operative engagement with said bar,
manually operable means for axially shifting 25
said rocker, a driving shaft rotatable independ
ently of said sewing machine actuating shaft, a
counter-shaft operatively connected to said driv
ing shaft, and an axially shiftable pivotal con
nection between said rocker and said counter 30
4. The combination with a sewing machine
having a frame including a work-support and a
bracket-arm overhanging said work-support, and
stitch-forming and work-feeding mechanisms 35
carried by said frame, of a trimmer mechanism
comprising a reciprocatory trimmer-knife actu
ating bar mounted in said bracket-arm, an end
wise shiftable rock-shaft journaled in said brack
et-arm, a crank-arm carried by said rock-shaft 40
adapted to be coupled to and disconnected from
said actuating bar, an electric motor mounted
upon said frame and having a rotor shaft, a
counter-shaft journaled upon said bracket-arm,
driving connections between said rotor and coun
ter-shafts, a crank-member carried by said 45
counter-shaft, a second crank-arm carried by
said rock-shaft, a pitman connection between
said crank-member and said second crank-arm
providing for endwise movements of said rock
shaft, and means for endwise shifting said rock 50
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