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Патент USA US2105347

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' Jan. 11, 1938.
-
'F. M. CARD
'
2,105,347
TRIMMING MACHINE
Original Filed May 12, 1936
3 Sheets-Sheet l
awe/whom
?eoleric M Card
‘wwneéh
Nd”.
mug
'Jan. 11, 1938.
F. M. CARD
2,105,347
TRIMMING MACHINE
Original Filed May 12, 1936
3 Sheets-Sheet 2
/2
[Feder ie 1”
‘wirineéh
WNM
Jan. 11, 1938.
F. M. CARD
2,105,347
TRIMMING MACHINE
Original Filed May 12, 1956
3 Sheets-Sheet 3
?ederie M Card
Patented Jan. 11, 1938
STATES PATENT OFFHQE
2,105,347
TRIMBIING MACHINE
Frederic M. Card, Bridgeport, Conn., assignor to
The Singer Manufacturing Company, Eliza
beth, N. J., a corporation of New Jersey
Original application May 12, 1936, Serial No.
79,231. Divided and this application January
19, 1937, Serial No. 121,260
9 Claims. (Cl. 164—47 )
This invention relates to improvements in
trimmer mechanisms of the reciprocating-knife
type, the invention having for its primary object
to provide a high-speed and durable knife-actuat
5. ing mechanism in a trimming machine particu
larly adapted for use in the production of sharply
curved and smoothly trimmed work-edges.
With the above and other objects in view, as
will hereinafter appear, the invention resides in
the trimming and work-feeding mechanisms de
scribed in connection with the accompanying
drawings, in which:
Fig. 1 is a rear side elevation, partly in section,
of a machine provided with the improved trim
mer-knife actuating mechanism. Fig. 2 is an
enlarged front end elevation, partly in section, of
the machine. Fig. 3 is a detail View in elevation
of the trimmer-knife throw-in lever. Fig. 4 is
a top plan view, partly in horizontal section, of
20 the machine and the trimmer-actuating mecha
nism thereof. Fig. 5 represents a substantially
vertical section of the counter-shaft crank and
pitman. Fig. 6 represents a longitudinal section
of the crank-actuated pitman, taken substan
Fig. 7 represents
25 tially on the line 5-43, of Fig. 5.
a transverse section of the pitman, taken substan
tially on the line 'I—'I, of Fig. 6.
As described in my co-pending patent applica
tion, Serial No. 79,231, ?led May 12, 1936, of which
this application is a division, the present inven
tion as illustrated in the drawings is embodied in
a sewing machine combining stitching and under
edge trimming mechanisms. However, it is to be
understood that in accordance with the present
35 invention, the thread-handling mechanisms of the
sewing machine may be omitted and that the
machine may be employed solely for trimming
Opposed to the feed-wheel B is a presser-roller Ill
carried by the lower end of the usual spring-de
pressed presser-bar II journaled for vertical
movements in the bracket-arm head 5.
Secured, by screws l2, to the under side of the
bracket-arm 4 is a trimmer bracket i3, providing
bearings in which a knife-bar I4 is journaled for
endwise reciprocation in a vertically inclined
path. Carried by the lower end of the knife-bar
I4 is a knife-holder I5 to which a work-severing
element in the form of a straight-edge trimmer
knife I6 is secured by screws ll. While the cutting
edge of the knife is straight, it is preferably in
clined downwardly in the direction of feed, as
illustrated in dotted lines in Fig. 2 of the draw
mgs.
a rock-shaft 25 disposed substantially parallel to
the main shaft 6, said rock-shaft 25 being jour
naled for rocking and endwise movements in
bearing-lugs 26 upon the machine bracket-arm,
at the rearward side thereof.
At its end opposite to the crank-arm 24, the
rock~shaft 25 has a circumferential groove 21
embraced by a suitably notched ear 28 upon a
Referring to the drawings, the machine has a
frame comprising a bed-plate I, from one end of
which rises a work-supporting post 2. Upon the
trimmer throw-out hand-lever 29. The hand
lever 29 is pivotally mounted upon a horizontally
opposite end of the bed-plate is the supporting
of the main shaft 6 and threaded into a boss
3| upon the machine bracket-arm 4. The hand
lever 29 depends below the bracket-arm 4 so as
to be conveniently accessible from the front side
45 supporting post 2.
J ournaled in the bracket-arm
1i, is a horizontally disposed main actuating shaft
of the machine, said hand-lever being spring
biased in a direction to releasably hold the cou
balance-wheel i.
pling pin 23 in the notch 22 of the actuator-bar 2 I.
A coil-spring 32 has its opposite ends connected
to the bracket-arm 4 and to the knife-bar It to
retract said knife-bar from operative position and
thereby to raise the actuator-bar 25 when the
hand-lever 29 is operated to disconnect the
coupling-pin from the actuator-bar 2|.
connections with the main-shaft 6, the present
feed-wheel actuating mechanism being similar
35
disposed fulcrum-screw 30 extending transversely
5 carrying at one end a combined belt-pulley and
The work to be trimmed is advanced by a feed
wheel 3 projecting through a suitably slotted
work-supporting plate 9 secured upon the upper
end of the work-supporting post 2. The feed
whecl 8 may be rotated by any suitable actuating
20
Suitably secured upon the knife-bar I4 is a
collar l8 pivotally connected by a link 19 to an
arm 20 of a bracket carried by the lower end of an
actuator-bar 2|. The actuator-bar 2! is con?ned
to vertical reciprocation in suitable guide-slots
provided in the bracket-arm head 5, said bar 2!
having in its outer edge a notch 22 adapted to
receive a coupling-pin 23. The coupling-pin 23
is carried by the free end of a crank-arm 24
extending horizontally forward from one end of
purposes.
standard 3 of a bracket-arm 4 which terminates
at its free end in a head 5 overhanging the work
55
to that disclosed in U. S. Patent No. 1,884,404,
Oct. 25, 1932, W. C. Van Ness et al., according to
which the feed-wheel is rotated at selectively
different speeds to continuously advance the work.
Suitably secured upon the trimmer-bracket l3, 56
52,105,347
2
at the rearward side thereof, is an auxiliary ~ lugs of said bracket 59 extend rearwardly from
bracket-plate 33 having its upper end spaced
from the bracket |3 to receive therebetween a
throw-in
hand-lever
for
the
trimmer-knife.
This hand-lever comprises complemental lever
members 34, 35 pivotally mounted adjacent each
the bracket-arm 4.
g
'
Suitably secured upon one end of the counter
shaft 53 is a grooved pulley 6| connected by a
belt 62 to a pulley 63 carried by the rotor-shaft U!
64 of an electric motor 55. The electric motor
55 is mounted upon a bracket 53 secured by
other upon a stud-bolt 36. The member 34 has
a laterally‘. o?set extension 3*! overhanging the screws 5‘! upon the rearward side of the support
ing standard 3 of the sewing machine bracket—
upper end of the lever-member 35 and to this
10 extension is suitably secured a bent spring 33 “arm, said electric motor 55 being preferably pro 10
bearing against the lever~member 35 belowthe vided with an electric-current controlling switch
pivotal axis thereof, said spring 38 functioning 58. The pulleys 5| and 53 are preferably propor
to yieldingly hold the lever-members 34, 35 tioned so that the counter-shaft 53 is rotated at
against relative movement. The lever-member
15' 35 of said hand-lever is yieldingly held by a
spring 33 against a ?xed stop-pin 43 extending .
inwardly from the bracket-‘plate 33 and determin
ing the normal inoperative position of the hand
lever' 34, 35. The offset extension 31 of the
a lower rate of speed than the speed of rotation
of the vrotor-shaft v64.
7
v
each provided with upstanding and vertically
apertured bosses 59, the apertures ‘I3 in said
end of the knife-bar i4 upon operation of the
hand-lever 34, 35 and,ias the bent spring .38 is
stronger than the spring 39, the knife-bar I4
bosses (Fig, 5) being alined with lug-apertures
1| forming lubricant wells below the bushing
apertures in said lugs. Each bushing 55 or 56
is diametrically apertured to provide a re
maybe depressed by .said hand-lever until the
stricted duct ‘32, connecting the boss-aperture T3
lever-member 34 is adapted to engage the upper
25 coupling-pin '23 enters the notch 22 in the actu
ator-bar 2|.
However, as the throw-in movement of the
knife-bar l4 serves to initiate reciprocation of
the actuator-bar 2! by the rock-shaft 25, the
30 rapidly succeeding rising movement of the knife
bar M with the actuator-baril reacts against the
hand-lever extension 31 before the member 35
with the shaft-bearing face of the bushing, and 25
a larger duct 13 alined with the lug-well 7|.
Preferably, a wick M is disposed in the well ‘H
and extends through the bushing-duct 13 into
contact with the counter-shaft 53. The boss
aperture 13 is yieldingly closed at its upper end 30
by a suitable spring-pressed‘valve '55, while the
bushing, 55 or 56, is provided in’ its shaft-bearing
of the hand-lever can be released by the operator.
face with intersecting spiral grooves 16.
It is at this time, primarily, that the spring 38
introduced into the boss-aperture 13, through the
35 functions to permit the member 34 of the hand
lever to yield relatively to the member 35, there
by absorbing the vibratory action that would
Oil
valve 15, passes through the ducts. ‘I2. and 13
into the well II, from which it is conducted by
otherwise be transmitted to the hand of the op
the wick ‘M to the shaft and is distributed by the
bushing-grooves ‘l6 lengthwise and circumfer
erator. The hand-lever member 35 is, 'in the
present instance, provided with a headed stud
entially of the shaft-bearing face of the bushing.
The pitman 53 is provided longitudinally there
4| which serves as a steadying guide vfor the
lower arm of the member 34 oi said hand-lever.
of with a bore 11 (Fig. 6) of which the upper
end is enlarged to'form a reservoir 78 adjacent
From .the foregoing description it will be under
stood that the trimmer-knife carrying bar l4
may be connected to and disconnected from the
rock-shaft 25 at the will of the operator during
the operation of the machine.
'
Extending rearwardly from the rock-shaft 25
and rigidly secured thereto is a forked rock
50 arm 42, the spaced members 43 and 44 of which
the crank-pin 5|. Intersecting the lower'pcrtion
of the reservoir 18is a transverse pitman-bore ‘i3
connecting said reservoir with the crank-pin bear 45
ing face of the pitman. Disposed in the trans
verse bore 19 is a wick 8D in wiping engagement
with the crank-pin 5|. The upper end of the
reservoir is, preferably, yieldingly closed by a
spring~pressed valve 8!, while the lower end of
are provided with'horizontally alined apertures
the pitman-bore T! is alined with a radial duct
slidably receiving a pin 45 disposed substantially
32 provided in the-tubular slide-pin 45.
Partly embracing the crank and pitman con
parallel to the rock-shaft 25. The pin 45 has a
longitudinal bore 45 preferably receiving a wick
55 41, said bore 45 being intersected by a plurality
of radial ducts 43 provided in said pin to conduct.
lubricant to the bearing faces in the rock-arm
members 43 and .44 for the pin 45.
Rigidly secured by a screw 49 upon the slide
60 pin 35, between the rock-arm members 43, 44, is
the apertured lower end of a vertically disposed
pitman 53. At its opposite end, the pitman 53
isapertured to pivotally embrace a crank-pin
5|, extending from a crank-disk 52 at one end
The pitman 5D is
65 of a rotary counter-shaft 53.
restrained against movement endwise of the
crank-pin 5| by a collar 54 suitably secured upon
said crank—pin. The counter-shaft 53 is disposed
substantially parallel to the main shaft 5 and is
70 journaled in ?anged bearing-bushings 55 and
55 suitably secured in’ horizontally apertured lugs
5‘! and 53 of a bearing-bracket 53. The bracket,
59 'is secured by screws 60 upon the machine
75 bracket-arm 4 so that the counter-shaft bearing
15
Inorder to supply lubricant to the counter
sha'ft bearings, the bracket-lugs 51 and 58 are
nection between the counter-shaft 53 and the
rock-arm members 43, 44, is an oil-guard bracket 55
33 which is substantially C-shaped in vertical
section, said bracket having a laterally extending
shank 84' secured by screws 85 to the under side
of the bracket-lug 51. The lower portion of the
bracket 83 has side walls 83.’, thereby to provide 60
a well for collecting lubricant thrown 01f by the
actuating mechanism embraced by the bracket.
From the foregoing description, it will be un
derstood that when the electric motor 65 is in
operation, the rocker comprising the rock-shaft 65
25 and its crank-arms 24 and 42 is continuously
actuated, the reciprocation of the trimmer-knife
it being dependent upon whether or not the
coupling pin 23 is in operative engagement with
the actuator-bar 2|. By swinging the hand-lever 70
29 to the right, as, viewed in Fig. 1, the rock
shaft 25 is shifted endwise to disconnect the
coupling-pin 23 from the actuator-bar 2|. The
slide-pin 45 connection between the pitman 50
and the rock-arm 42 leaves the pitman 501m 75
2,105,347
affected by the endwise movements of the rock
shaft 25. It will be further understood that the
trimmer-knife l6 may be rendered inoperative
by disconnecting the electric motor 85 from its
10
15
20
25
source of power, wherebylthe machine may be
operated to advance the work without actuating
any portion of the trimmer mechanism.
Having thus set forth the nature of the in
vention, what I claim herein is:
l. A trimmer mechanism. com-prising, a recip
rocatory trimmer-knife actuating bar, a rocker
shiftable lengthwise of its pivotal axis into and
out of operative engagement with said bar, man
ually operable means for axially shifting said
rocker, a rotary shaft, a crank-member carried
by said shaft, a pitman embracing and restrained
against movement axially of said crank-member,
and an axially shiftable pivotal connection be
tween said pitman and said rocker.
2. A trimmer mechanism comprising, a recip
rocatory trimmer-knife actuating bar, a rocker
shiftable lengthwise of its pivotal axis into and
out of operative engagement with said bar, man
ually operable means for axially shifting said
rocker, a rotary shaft having its axis of rotation
substantially parallel to the pivotal axis of said
rocker, a crank-member carried by said shaft, a
pitman embracing and restrained against move
ment axially of said crank-member, and an ax
30 ially shiftable pivotal connection between said
pitman and said rocker.
3. A trimmer mechanism. comprising, a re
ciprocatory trimmer-knife actuating bar, a
rock-shaft shiftable lengthwise of the pivotal
35 axis thereof, manually operable means for ax~
ially shifting said rock-shaft, a crank-arm car
ried by said rock-shaft adapted to be coupled to
and disconnected from said bar, a rotary shaft
disposed substantially parallel to said rock—
40 shaft, a second crank-arm carried by said rock
shaft, and means for actuating said rock-shaft
from said rotary shaft including an axially shift
able pivotal connection with said second crank
arm.
45
4. A trimmer mechanism comprising, a recip
rocatory trimmer-knife actuating bar, a rotary
shaft, a crank-member carried by said shaft, a
plural-armed rocker having one of its arms op—
eratively connected to said actuating bar, a pit
50 man carried by said crank-member, a slide-pin
carried by said pitman and having a sliding piv
otal connection with another arm of said rocker,
and manually operable means for shifting said
rocker lengthwise of the pivotal axis thereof,
55 thereby to disconnect said rocker from said actu
ating bar.
3
5. A trimmer mechanism comprising, a recip
rocatory trimmer-knife actuating bar, a rotary
shaft, a crank-member carried by said shaft, a
rocker operatively connected to said actuating
bar and having a forked crank-arm provided with
alined bearing apertures, a pitman embracing
said crank-member and provided with a lubri
cant reservoir open to the crank-member, a tu
bular slide-pin carried by said pitman in pivotal
and endwise sliding engagement with said crank 10
arm, said slide~pin having radial ducts connect
ed with said reservoir and with said crank-arm
bearing apertures, and manually operable means
for shifting said rocker lengthwise of the pivotal
axis thereof, thereby to disconnect said rocker 15
from said actuating bar.
6. A trimmer mechanism comprising a recip
rocatory trimmer~knife actuating bar, actuating
mechanism for reciprocating said bar adapted to
be operatively connected to said bar during the 20
operation of said mechanism, and manually op
erable means for operatively connecting said bar
and its reciprocating mechanism including a
hand-lever having members yieldable relatively
to each other responsive to reciprocation of said 25
bar by said mechanism.
'7. A trimmer mechanism. comprising a recip
rocatory trimmer-knife actuating bar, actuat
ing mechanism for reciprocating said bar adapt
ed to be operatively connected to said bar during 30
the operation of said mechanism, and manually
operable means for operatively connecting said
bar and its reciprocating mechanism including
a hand-lever having complemental lever-mem
bers supported for turning movements about a 35
pivotal axis common to said lever-members, and
a spring yieldingly holding said lever-members
against relative movement.
8. A trimmer mechanism comprising a recip—
rocatory trimmer-knife actuating bar, actuating
mechanism for reciprocating said bar adapted to
be operatively connected to said bar during the
40
operation of said mechanism, a member manu
ally operable to couple said bar and its actuat
ing mechanism, and means interposed between 45
said member and said bar yieldable responsively
to reciprocation of said bar by said mechanism.
9. A trimmer mechanism comprising a recip
rocatory trimmer-knife actuating bar, an actu
ating element adapted to be operatively con 50
nected to reciprocate said bar, means for shift
ing said bar into position for engagement by said
actuating element including a manually operable
member, and means yieldingly interposed between
said member and said bar.
55
FREDERIC M. CARD.
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