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Патент USA US2108139

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Feb. 15, 1938.
Original Filed Feb. 27, 1956
4 Sheets-Sheet l
Feb. 15, 1938.
‘R. ‘s. ‘PAINTER.
original; Filed Feb. 27, 1936
4 Sheets-Sheet 2
10a (Iniet
Feb. 15, 1938.
Original Filed- Feb. 27, 1936
' mm”
14.;ii? i
4 Sheets-Sheet 4
Patented Feb. 15, 1938
Roy Stanley Painter, Hannibal, Mo., assignor to
The Singer Manufacturing Company, Elizabeth,
N. J., a corporation of New Jersey
Original application February 27, 1936, Serial No.
66,012. Divided and this application October
20, 1936, Serial No. 106,524
9 Claims. (CI. 12-51)
the main shaft 6 in any usual or suitable man
ner, and preferably so that the feed-dog 9 has
one effective work-advancing movement for each
sharply curved work-edges.
rotation of the main-shaft 6. As feeding mech
Another object of this invention is to provide
a trimming machine, having a work-feeding
mechanism, with means for controlling the rel
ative speeds of operation of the work-feeding and
10 work-severing mechanisms.
With the above and other objects in view, as
will hereinafter appear, the invention resides in
the trimming and work-feeding mechanisms
hereinafter described in connection with the ac
companying drawings, in, which:
Fig. 1 is a rear side elevation, partly in section,
of a machine provided with the improved trim
mer-actuating mechanism. Fig. 2 is a front end
elevation, partly in section, showing the bracket
20 arm and work-supporting post of the machine.
Fig. 3 represents a top plan view of the ma
chine, with the bracket-arm shown in longitudi—
nal section. Fig. 4 is a detail view in side ele—
vation of a portion of the trimmer-knife actu
ator bar and its driving stud. Fig. 5 represents
a rear side elevation of the machine mounted
upon a supporting table provided at the under
side thereof with a treadle-controlled electric~
dog 9. The feed-bar 8 derives its actuation from
This invention relates to improvements in
trimming machines and has for its primary ob
ject to provide a machine particularly adapted
to eifect the production of smoothly severed and
transmitter for driving the machine, certain parts
of the machine being omitted.
As described in my copending patent appli
cation Serial No. 66,012, ?led Feb. 27, 1936, of
which this application is a division, the present
invention is illustrated in the drawings as em
anisms of this character are old and well known
in the sewing machine art, it has been deemed
unessential to an understanding of the present
invention to illustrate and describe any speci?c
form of feed-dog actuating mechanism.
The feed-dog 9 operates through a suitably
slotted throat-plate H! secured upon the upper
end of the post 2 and is opposed in its work-en
gaging movement by a presser-roller H. The
presser-roller H is carried by the lower end of
the usual spring-depressed p-resser-bar l2 jour
naled for vertical movements in suitable bear
ings provided in the bracket-arm head 5.
Depending ‘from the under side of the bracket
arm 4 is a frame-boss l3 provided with a ?at
tened lower face affording a seat for a trimmer
bracket I6 ?xedly secured to said boss by screws
I5. J ournaled in suitable bearings provided upon
the trimmer-bracket i 4 for endwise reciprocation
in a vertically inclined path is a knife~bar 55
carrying, at its lower end, a knife-holder H to
which a work-severing element in the form of a
straight-edge trimmer-knife I8 is secured by
screws I9.
While the cutting edge of the knife
is straight, it is preferably inclined downwardly 30
in the direction of feed, as illustrated in dotted
lines in Fig. 2 of the drawings, the trimmer
knife I8 having a path of movement to sever the
work substantially parallel to the line of feed.
C23 Or bodied in a sewing machine to provide a combined
The movement of the trimmer-knife in a verti
ance with the present invention, the thread han
dling mechanisms of the sewing machine may be
40 omitted and that the machine may be employed
the work results in the production of undercut
trimmed edges and, accordingly, in the trimming
of shoe linings the trimmed edge of the lining
is concealed by the beveled edge of the shoe-up 40
per, as is well understood in the art.
As heretofore constructed, the underedge cut
stitching and underedge-trimming machine.
However, it is to be understood that, in accord
solely for trimming purposes.
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 opposite end of the bed-plate is the
supporting standard 3 of a bracket-arm 4 which
terminates at its free end in a head 5 overhang
ing the work-supporting post 2. Journaled in
the bracket-arm 4 is a horizontally disposed
main actuating shaft 6 carrying at one end a
combined belt-pulley and balance-wheel l.
The work to be trimmed is preferably inter
mittently advanced by a drop-feed mechanism
including a feed-bar 8 disposed vertically within
55 the post 2 and carrying at its upper end a feed_—
cally inclined path transverse to the plane of
ting trimmer-knife has usually been actuated
from the main shaft of the sewing machine to
reciprocate once for each needle reciprocation.
When trimming in sharp curves, occurring par
ticularly in shoe production, the work is not
only advanced by the feeding mechanism of the
machine but is also sharply turned by the op
erator between successive reciprocations of the
trimmer-knife, according to the desired work
edge outline. As a consequence, successive
straight cuts made by the trimmer-knife inter
sect each other at an angle and the trimmed
edge of the work presents an objectionable ap 55
pearance. It has been heretofore proposed to
overcome this difliculty by reciprocating the trim
mer-knife twice foreach rotation of the main
shaft of the machine, but this proposal has proven
unsatisfactory for several reasons and particu
larly because of the lack of durability of the
trimmer mechanism when operated at the higher
speeds of operation of the machine. The present
invention obviates the di?iculties inherent in the
10 prior known arrangements in a simple and novel
Suitably secured upon the knife-bar i5 is a
collar 20 pivotally connected by a link 25 to an
arm 22 of a bracket rigidly carried by the lower
end of an actuator bar 23. The actuator bar 2-3
is con?ned to vertical reciprocation in suitable
guide-slots 24 provided in the bracket-arm head
5, said bar 23 having in its outer edge a. notch 25
adapted to receive a coupling-pin 26. The cou
pling-pin 26 is carried by the free end of a crank
arm 2? extending horizontally forward from one
end of a rock-shaft 28 disposed substantially
parallel to the main shaft 6, said rock-shaft 28
being journaled for rocking and endwise move
ments in bearing-lugs 29 upon the machine
bracket-arm, at the rearward side thereof.
At its end opposite to the crank-arm 2?, the
rock-shaft 28 has a circumferential groove 3i) em
braced by a suitably notched ear 3| upon one
30 arm 3'2 of an angular hand-lever 32, 33. The
hand-lever 32, 33 is pivotally mounted upon a
horizontally disposed fulcrum-screw 34 extend
ing transversely of the main shaft 5 and threaded
into a boss 35 upon the machine bracket-arm 4.
The arm 32 of the hand-lever depends below the
bracket-arm 4 so as to be conveniently accessible
from the front side of the machine, while the arm
33 of said lever is acted upon by a spring 36 to
yieldingly shift the rock-shaft 28 in'a direction to
40 effect driving engagement by the coupling pin
25 with the actuator bar 23. A coil-spring 31 has
its opposite ends connected to the bracket-arm
A and to the knife-bar Hi to retract said knife-bar
and thereby to raise the actuator-bar 23 into in
45 operative positions of said bars, when the hand
lever 32, 33 is operated to disconnect the cou
pling-pin 26 from the actuator-bar 23.
Pivotally mounted upon the: trimmer-bracket
I4 is a hand-lever 38 which is yieldingly held in
inoperative position by a spring 39. The upper
end of this lever 38 has a lateral extension 130
adapted, upon operation of said lever, to engage
the upper end of the knife-bar t5 and to depress
said knife-bar against the action of the spring
3i’. Being connected to the knife-bar !6, the ac
tuator-bar 23 is likewise depressed by operation
of the hand-lever 33, until the notch 25 of the
bar 23 is in alinement with the coupling-pin 25,
whereupon said coupling~pin enters the notch 25
under the influence of the spring 36. It will,
therefore, be understood that the trimmer-knife
carrying bar it may be connected to and dis
connected from the rock-shaft 23 at the will of
the operator during the operation of the ma
Extending rearwardly from the rock-shaft 22
and rigidly secured thereto is a rock-arm 4! hav
ing a forked free end embracing an eccentric I32
carried by the rotor-shaft d3 of an electric-motor
44. The eccentric 132 is elongated to provide for
the requisite sliding movement of the fork of the
rock-arm 13! upon said eccentric when the rock
shaft 28 is shifted end-wise to disconnect the cou
pling pin 2% from the actuator-bar 23.
The electric-motor lid is disposed so that its
rotor-shaft is substantially parallel to and pref
erably at substantially the same level as the main
shaft 6 of the machine, said electric-motor being
mounted upon a suitable bracket 45 secured by
screws 46 upon the rearward side of the machine CI
bracket-arm 4. The electric-motor has the usual
current-controlling switch Li? and derives its
power from any suitable source, through current
leads 48, so that the electric-motor may be op
erated independently of the operation of the ma 10
chine feeding mechanism. A guard-bracket 49
houses the eccentric ‘i2 and the forked end of
the rock-arm it, said guard-bracket having a
supporting shank 58 secured by screws, as 5i,
upon the flattened upper face of the bearing-lug
29 which is adjacent to the rock-arm 4!.
The trimming machine is preferably mounted
upon a supporting table at the under side of which
is disposed trimming machine driving means of
any usual or suitable character. As illustrated in 20
Fig. 5 of the drawings, this driving means may
comprise an electric-transmitter having a sup
porting frame 52 suitably secured to the under
side of the machine-supporting table 53. Carried
by said frame 5.2 is an electric motor 5*‘; having 25
a rotor-shaft 55 upon which is secured a driv
ing clutch-member 5'6 for rotation therewith.
Adapted to frictionally engage the driving clutch
member 55 is a driven clutch-member 5'! which is
peripherally grooved to form a belt-pulley con 30
nected by a belt 58 with the pulley ? or" the trim
ming machine. The driven clutch-member 51
may be shifted endwise of the rotor-shaft 55, in
to frictional engagement with the driving clutch
member 56, by a lever 59 pivotally mounted up
on an arm 63 extending from the transmitter
frame 52. The lever 59 is connected by an ad
iustable rod 6| to a suitable treadle 62. By oper
ation of the treadle 62, the lever 59 may be actu
ated against the action of a spring 83 to bring 40
the clutch-member 5'! into frictional engagement
with the clutch-member 5'6, thereby to drive the
trimming machine. The speed of operation of
the trimming machine may, of course, be varied
by permitting slippage between said clutch-mem
bers. It is to be understood, however, that the
present invention is not limited to the speci?c
form of trimming machine driving means de
scribed, as any other suitable speed-controlling
power-transmitting device may be employed.
From the foregoing description, it will be un
derstood that when the electric-motor M is in
operation, the rock-shaft 2B derives rocking
movements from the eccentric I32 carried by the
rotor-shaft 43 of the electric-motor. Upon op 55
eration of the hand-lever 33, the actuator-bar 23
is coupled to the crank-arm 2'! of said rock-shaft,
thereby transmitting reciprocatory movements to
the knife-bar l6 which may, at will, be discon
nected from its actuating mechanism by manip
ulation of the hand-lever 32, 33.
The rotor-shaft d3 of the electric-motor 134
rotates at a substantially constant speed, pref
erably at least equal to the maximum speed of
rotation of the main shaft 6 of the trimming ma
chine. Therefore, when the trimming machine is
operated at maximum speed and the motor 124 is
running, the trimmer-knife l8 reciprocates once
for each work-advancing movement of the feed 70
dog 55. However, it is only in substantially straight
line trimming that the machine is operated at
higher speeds and that the successive straight
cut-s performed by the trimmer-knife l? are in
alinement or so nearly in alinement that the 75
trimmed edge of the work presents a smooth
On the other hand, the trimming of sharp
curves is necessarily performed at slow speeds of
operation of the machine and, at such slower
speeds, the trimmer-knife of the present inven
tion continues to operate at the same speed as
before. For example, if the trimmer-knife per
forms 2800 reciprocations per minute and the
machine is operated at a speed of 400 revolutions
per minute of the main shaft 6, the trimmer
knifewill have seven work-severing strokes for
each feeding movement. Consequently, when
the work is sharply turned by the operator at the
slower speeds of operation of the machine, the
intersections of successive cuts performed by the
trimmer-knife approach each other so closely
that smooth trimming is maintained. The pres
ent improvement therefore provides means for
actuating the trimming mechanism: at speeds
having a ratio variable at will during the opera
tion of the machine.
As illustrated in the accompanying drawings,
the trimmer mechanism assembly includes the
usual edge-guide and adjusting devices, which
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. In a trimming machine, the combination
substantially parallel to the line of feed, means
for varying the speed of operation of said feed
ing mechanism relative to the frequency of re
ciprocation of said trimmer-element without
stopping the machine, and means operable at
will during the operation of the machine for in
terrupting the effective action of said trimmer
5. In a trimming machine, the combination
with a work-support and mechanism for feeding 10
sheet-material Work in the plane thereof, of
trimming means including a reciprocatory trim
mer-element having a Work-severing cutting
edge substantially parallel to the line of feed,
means for varying the speed of operation of said
feeding mechanism relative to the frequency of
reciprocation of said trimmer-element without
stopping the machine, and means operable at
will during the operation of the machine for
throwing said work-trimming mechanism out of
and into effective action.
6. The combination with a trimming machine
having a work-feeding mechanism including a
feed-dog, of a trimmer mechanism including a
reciprocatory knife having effective work-sever
ing movements adjacent said feed-dog, said knife
having its cutting edge substantially parallel to
the line of feed, an electric motor operable in
dependently of said work-feeding mechanism,
with means for supporting and marginally feed
ing sheet material work in the plane thereof, of
trimming means including a reciprocatory ply
and operative connections with said electric mo 30
tor for reciprocating said knife.
7. The combination with a trimming machine
having a work-feeding mechanism, of a recipro
catory trimmer-element having a work-severing
ting edge substantially parallel to the line of
feed, an electric motor having a rotor-shaft op
trimming element having a work-severing cut- ‘ cutting edge substantially parallel to the line of 1
feed, and means to vary the work-advancing
speed of the feeding means relative to the fre
quency of reciprocation of the trimming-element
without stopping the machine.
2. A trimming machine having a frame includ
ing an upstanding work-supporting post and a
bracket-arm overhanging said post, a work-feed
ing mechanism including a feed-dog operating
through the free end of said post, a trimmer
mechanism supported by said bracket-arm and
including a reciprocatory trimmer-element hav
ing effective work-severing movements adjacent
said feed-dog, and means operable independently
of said feeding mechanism for actuating said
trimmer mechanism.
3. A trimming machine having a frame includ
ing a work-support and a bracket~arm over
hanging said work-support, a work-feeding
mechanism, a trimmer mechanism supported by
said bracket-arm and including a reciprocatory
trimmer-element having a work-severing path of
movement inclined vertically to said work-sup
port, said trimmer element having its cutting
60 edge substantially parallel to the line of feed, and
means to Vary at will the relative speed ratio of
said work-feeding and trimmer mechanisms dur
ing the operation of the machine.
4. In a trimming machine, the combination
with a work-support and mechanism for feeding
sheet-material work in the plane thereof, of trim
ming means including a reciprocatory trimmer
element having a work-severing cutting edge
erable independently of said work-feeding mech
anism, an eccentric carried by said rotor-shaft,
and actuating connections for reciprocating said
trimmer-knife from said eccentric.
8. The combination with a trimming machine
having a frame including a work-support and
a bracket-arm overhanging said work-support,
a rotary actuating shaft journaled in said brack
et-arm, and a work-feeding mechanism actuated -
from said shaft, of a trimmer mechanism sup
ported by said bracket-arm and comprising a re
ciprocatory trimmer-element having a. work
severing path of‘ movement inclined to said
work-support, an electric motor operable inde
pendently of and having a rotor-shaft disposed
substantially parallel to said actuating shaft, a
rock-shaft, means for imparting rocking move
ments to said rock-shaft from said rotor-shaft,
and means connected to said rock-shaft and dis
connectible therefrom at will during the opera
tion of the machine for reciprocating said trim
9. In a trimming machine, in combination, a
work-advancing feed-dog and a reciprocatory 60
trimmer-element operable at a variable ratio of
relative frequencies, means for actuating said
feed-dog, means for reciprocating said trimmer
element, and means for varying said ratio com
prising controlling means for operating said
feed-dog at different speeds.
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