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Патент USA US2134821

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Nov. 1, 1938.
w. F. HELMOND
2,134,821
TYPEWRITING MACHINE
Filed Aug. 15, 1935
2 Sheets-Sheet 1
//7 venfor;
Nov. 1, 1938‘
w. F. HELMOND
2, 134,821
TYPEWRITING MACHINE
Filed Aug. 15, 1935
2 Sheets-Sheet 2
Patented Nov. 1, 1938
2,134,821
UNITED STATES PATENT OFFICE
2,134,821
‘TYPEWRITING MACHINE
William F. Helmond, West Hartford, Conn., as
signor to‘ Underwood Elliott Fisher Company,
New York, N. Y., a corporation of Delaware
Application August 15, 1935, "Serial 'No. 36,272
14 Claims.
This invention relates to the paper-feed or
pressure rolls that are associated with the platen
roll of a typewriter.
A feature of the invention is the provision, in
5 combination with spring-means for the bottom
feed-rolls, of novel devices designed to facilitate
adjustment of said spring-means ‘to regulate the
bottom feed-roll pressure, and to gain other ad
vantages.
l‘U
A further feature of the invention resides in
an improved booster-spring device usable at will,
as when typing a stiff work-sheet, for applying
to the bottom feed-rolls, spring-pressure which is
additional to or above the regular spring-pres
sure.
Two sets of main feed-rolls, front and rear,
at the bottom of the platen are carried by means
of rocker-arms. The rocker-arms, for each bot
tom feed-roll set, are connected by a cross-rod
‘20 spaced from the rocker-arm axis. A draw
spring, for pressing the bottom feed-rolls against
(01. 197—138)
work-piece is to be fed around the platen, an
extra or booster-spring device is used and is
arranged to apply the extra spring-pressure to
.both sets of bottom feed-rolls. To this end a
leaf or bar spring spans the aforesaid rocker OI
arm-connecting cross-rods to press upon the lat
ter. A spring-?exing ?nger may be brought
into play manually by means of a handle to bear
upon said leaf-spring at a point between said
cross-rods and flex said spring, and thereby cause 10
it to put additional spring-pressure upon both
sets of bottom feed-rolls by way of said cross~
rods.
Withdrawal of said ?nger by means of said
handle will remove the extra spring-pressure 15
from the bottom feed-rolls. Said ?nger may be
made resiliently yieldable, as by mounting it up
on a resiliently yieldable support, for the purpose
that when the bottom feed-rolls are cast off, said
?nger, if it be effectively positioned, may yield 20
and ‘thereby obviate excessive flexing of the al
the platen, is connected across the cross-rods
and is therefore common to both sets of bottom
ready flexed booster-spring.
feed-rolls.
arm-connecting cross-rods intermediately of the
One of the rocker-arm-connecting
25 rods is notched by means of a screw-thread pro-,
vided thereon. One ‘end of the draw-spring is
anchored in and is differentially locatable by
means of said screw-thread notches ‘for adjust
ing the spring-pressure, and the other end of the
30 draw-spring may be ?xed to the other cross-rod.
The draw-spring will be at least tension when
it ‘extends squarely across the rocker-arm-con
necting cross-rods. By slanting the spring ‘across
the cross-rods its tension will be increased. ‘This
35 slanting of the spring, for adjustment of the
feed-roll pressure, may be e?ected di?erentially
by shifting the screw-thread-engaging end of the
spring to different notches as by merely‘d-rawing
the spring-end out of one notch of the screw
40 thread and passing it to another notch. The ad
justment may also be e?'ected by turning ‘the
threaded cross-rod, the thread then acting to
move the draw-spring end along the cross-rod,
like a nut held against rotation, ‘to slant the
45 spring more or less, depending upon the direction
and extent of turning the threaded cross-rod.
Additional locking devices are not necessary to
maintain the draw-spring in its adjusted-position
since the adjustable draw-spring end cannot of
50 itself creep along the thread of the cross-rod,
nor can the threaded cross-rod turn of itself since
it is frictionally held by the tension of the‘draw
spring.
For applying more than the regular spring
55 pressure upon the feed-rolls, as when ‘a stiff
.
The booster-spring may press upon the rocker
ends of the latter, so that it may act uniformly 25
upon the bottom feed-rolls. In order that the
primary or adjustable draw-spring device may
also act uniformly upon the bottom feed-rolls
two draw-springs may be used, one beyond each
side of the booster or secondary spring device.
30
Other features and advantages will hereinafter
appear.
.In the accompanying drawings,
Figure l is a perspective showing the platen
frame of a standard Underwood noiseless type- 35
writer, provided with the present improvements.
Figure 2 is a View showing the draw-spring,
drawn out of the groove of the threaded an
chorage-shaft preparatory to setting the end of
the‘ spring into one or another groove for adjust- 40
ment of the ‘spring tension.
Figure 3 is similar to Figure 2, but shows the
draw-spring seated in one of the grooves.
Figure 4 is a sectional side elevation, showing
the novel draw-spring-devices, and the feed- 45
rolls in normal positions.
Figure 5 is a plan of the platen-frame assem
blage, partly broken away, showing the draw
spring and booster-spring devices.
Figure 6 is a sectional view similar to Figure 4, 50
but shows in addition the booster-spring and how
it is ?exed to apply extra pressure to the feed
rolls.
Figure 7 is a sectional view similar to Figure 6,
vbut shows the feed-rolls cast o? from the platen. 55
2
2,134,821
The usual Underwood platen I 0 is journaled
by axle II in ends I2, I3, of a platen-frame.
Front and rear feed-rolls I4 and I5 run upon the
bottom of the platen.
platen ID.
Type-bars I6 strike the
The feed-rolls are thrown on and
off the platen by rocking a cam-shaft I1.
Novel spring-tension means for the feed-rolls
I4 and I5 are applied and adjusted in the fol
lowing manner.
10
Tension or draw springs I9 and 20 may be
caught at their forward ends in grooves 2| and
22 of a cross-rod 31, which, at its ends, is loosely
connected to front feed-roll-carrying rocker
arms 23 and 24. These springs tend to lift said
15 arms, and press the front rolls up against the
platen.
Attached to the rearward end of each of springs
I9 and 20 is a clip-hook or eye-piece 25, with an
aperture 26 in its rear end. For adjusting the
20 stretch and thereby the tension of the draw
springs I9, 20, there has been provided a novel
anchorage-shaft or cross-rod 21, which may be
rotatively supported in rocker-arms 28, 29, which
carry the rear feed-rolls I5.
Said shaft 21 has
25 screw-threaded portions to afford notches 30, 3|,
by means of which the eye-pieces 25 of the draw
springs may be differently spaced, along said
shaft 21, from the spring-ends that are ?xed by
the grooves 2|, 22.
30
By using a hook 32, as seen in Figure 2, or
pliers 33 as in Figure 1, the clips 25 of the springs
are withdrawable from the notches 30 and 3|, for
shifts to the right or left along the shaft 21, and
may be seated in any desired notch 30 or 3|, to
36 slant the springs more or less across the cross
rods 21, 31 and thereby regulate their tension.
Thus either draw-spring may be adjusted indi
vidually, so that adjustment can be effected in
the pressure of the front and rear feed-rolls at
40 either the right or left of the roll-system. Since
each spring I9, 20 is connected to front and rear
roll-carrying arms 23, 24 and 28, 29, it presses the
arms upwardly about their pivots, to press the
end rolls up against the platen. The springs act
together upon the middle rolls I4, I5. The ten
sioning of either spring by slanting it more in the
described manner, will increase the pressure of the
adjacent front and rear end rolls. Thus adjust
ment and correction may proceed until all rolls
bear equally upon the platen. Or the pressure
upon one end of the platen may be made greater
than upon the opposite end. Collective or omni
bus adjustment may be effected by turning the
shaft 21 by means of either of the easily accessible
screw-slotted ends 34 or 35. As shaft 21 is
turned, the eye-ends 25 of the springs are ad
justed by the screw-threads 30, 3| towards or
away from the ends ?xed in the grooves 2|, 22 of
cross-rod 31, thereby easing or increasing the
60 tension.
The screw-threads 30, 3| are shown as
being of opposite hands, so that the two springs
I9, 20 may slant rightward and leftward for the
purpose of neutralizing their end-thrust effects
upon the cross-rods 21, 31.
Through this uniform collective feed-roll ten
sioning, there may always be a balanced or equal
ized feed-roll pressure. The universal adjust
ment can be effected, whether the original ten
sions of the springs 19 and 20 are even or uneven.
70
It will be seen that the two lines of feed-rolls
are connected, to move simultaneously into and
out of engagement, with the platen and work
sheets, This is effected by a feed-roll-release
lever, not shown, having connection I8 with the
usual cam-shaft I1, which extends along the
platen, to control the release and restoration of
the feed-roll arms and rolls.
It will be seen that a uniform and true tension
can be secured on all the rolls; and a properly
proportioned feed-roll pressure may be effected.
There is provision of right and left individual
spring tension; and spring adjustment for nor
mal feed-roll setting is secured by moving the
eye-pieces 25 into selectable notches 33, 3| on rear
anchorage-shaft 21. After the feed-rolls have 10
been normally set to the platen, with either even
or uneven pressure, their pressure can be collec
tively increased or decreased by turning the dual
threaded anchorage-shaft 21 in its bearings in
the feed-roll-carrying arms 28, 29 which may also
coact with shaft-shoulders, indicated at 46, Fig
ure 1, to retain said shaft 21 endwise.
Each of the rear feed-roll-carrying arms 28, 29
is pivoted upon a shaft 41 and has a stabilizing
hub 46. The carrying arms 23, 24 for the front
feed-rolls I4 are also pivoted upon said shaft 41.
Said pivoted shaft 41 is supported in brackets 49
on the platen-frame base 40 and is retained
against endwise displacement by means of an end
head 5| and an end nut 52.
The feed-roll-releas
ing cam-shaft I1 is also journaled in the brackets
49 and is retained against endwise displacement
by a collar 53 and by abutment of the side of a
cam-?at-forming notch 54 of said shaft I1 with
arm 55 of the front feed-roll-carrying arm 24, the 30
latter in turn abutting one of the brackets 49.
For applying extra pressure to the feed-rolls l4,
I5, as for thick-card-feeding, a leaf spring 36 is
used as a booster-spring and is clipped by means
of a curled end 363, Figure 1, to the middle of 36
anchor-shaft 21. The front end of said spring
abuts the under side of the front cross-rod 31
midway thereof. This spring 36 may be normally
un?exed, Figure 1, for regular feed-roll pressure,
or, if extra pressure is desired, it may be ?exed, 40
Figure 6, by means of a ?nger or cam 38, attached
to a rock-shaft 4|, journaled in a yieldable sup
port 39 adjacent the ?nger 38. Said booster
spring-controlling rock-shaft 4| extends beyond
the platen-frame end I3 to present a handle 44, 45
and is supported near its handle end by a hanger
42 secured to said platen-frame end by screw 43.
The yieldable support 39 constructed of spring
metal and fastened to the platen-frame base 40
by a screw 56 forms a resilient arm having its
free end curled as at 39a to form the bearing for
booster-spring-controlling rock-shaft 4|. Said
yieldable support 39 may have on either side of
the single screw 56 a downwardly-projecting hold
ing tongue 45 engaging the base 40.
(2 Q1
Upon casting off the feed-rolls I4, I5, as in
Figure 7, the support 39 will yield together with
the ?nger 38 if the latter has been operated to
flex the booster-spring 36 for extra spring pres—
sure. The yielding of the ?nger 38 through its 60
support 39 thus obviates excessive ?exing of the
already ?exed booster-spring 36 when the feed
rolls are cast off.
The rock-shaft 4| may be
sufficiently loose in the bearing 39a and in the
hanger 42 to permit it to swivel slightly in said
hanger 42 in accommodation to the yieldability
of said support 39. The rear set of bottom feed
rolls has two middle feed-rolls I5, instead of a
single middle roll, in order to provide room, be
tween said two middle rolls I5, for the booster 70
spring 36.
Variations may be resorted to within the scope
of the invention, and portionsof the improve
ments may be used without others.
Having thus described my invention, I claim:
75
2,134,821
3
1. ‘In a typing machine, the combination of a
cross-rod connecting each two arms and spaced
platen-roll, two feed-rolls spaced circumferen
tially of the platen-roll, an individually pressible
supporting device for each feed-roll for pressing
from the pivot-axis of said arms, one of said
and left, respectively, at two sections of its
the feed-roll against the platen-roll, a draw
spring, and means for connecting said draw
length, and two draw-springs connected across I'
said cross-rods for pressing said feed-roll sets
spring to both feed-roll-supporting devices and
for regulating its force to regulate the feed-roll
respectively seated, at one end, in the right and
pressure, said means including a screw journaled
10 in one of said feed~roll-supporting devices, one
end of said spring having a clip holdable by means
of the thread of said screw, the othe ' end of said
spring being attached to the‘ other feed-roll-sup~
porting device, said clip being withdrawalole from
15 the screw-thread for placement in different
notches afforded by the latter to thereby quickly
vary the stretch and force of the spring, the
stretch and force of the spring also being variable
by turning said screw and thereby causing said
20 , clip to move therealong.
2. In a typing machine, the combination of a
'revoluble platen, two feed-roll sets spaced circum
ferentially of the platen, an individually pressible,
supporting device for each feed~roll set for press~
26 ing the latter against the platen,
spring con»
nected across the two feed—roll—su;:-porting devices
for pressing both of said feed-roll devices jointly,
by spring-?exing pressure applied transversely of
said spring at a point intermediate of
con~
30 nections to said feed-roll-supporting devices, and
means operable at will for applying and rerlioving
said spring-flexing pressure.
3. In a typing machine, the combination of a
cross-rods being externally screw-threaded right
against said platen, the two draw~springs being
left threaded'sections, the other spring ends being
anchored to the other cross-rod, said threaded 10
cross~rod being rotatable, whereupon its right
and left threads act to variably and oppositely
slant said springs across said cross-rods thereby
to vary the stretch and tension of said springs for
adjusting the feed-roll pressure, the opposite 15
slanting of the springs acting to neutralize the
end thrusts induced in the cross-rods by the
slanted springs individually.
'7. In a typing machine, the combination of a
revoluble platen, two feed-roll sets spaced cir 1.20
oumferentially of the platen, supporting means
for each feed-roll set to press the latter against
the platen, and two draw-springs individually
connected across the two supporting means for
feed-roll sets for pressing the latter against
the platen, said springs having connections
whereby they may be adjusted independently to
regulate their individual forces for regulating the
distribution of feed~roll pressure along the platen,
and whereby they may be adjusted jointly to .30
regulate the whole distributed feed-roll pressure.
8. In a typing machine, the combination with
the platen-roll, of two feed-roll lines, front and
revoluble platen, two feed-roll sets spaced circu1nferentially of the platen, an individually pressible,
supporting device for each feed-roll set for press
ing the latter‘ against the platen, a spring con
rear, near the bottom of the platen, laterally
nected across the two feed~roll~supporting devices
rod being spaced from its rocker-arm axis, and
for pressing both of said feed-roll devices jointly,
by spring-?exing pressure applied transversely of
a draw-spring connected across the cross-rods
and acting to press both lines of feed-rolls against 40
the pie-ten, one of the rocker-arm-connecting
said spring at a point intermediate of its connec
tions to said feed-roll-supporting devices, and
means operable at will for applying and removing
said spring-flexing pressure, said two feed-roll
supporting devices being movable for withdrawing
said feed-roll sets from the platen, and said pres
sure-applying means being yieldable to obviate
excessive ?exing of said spring when said feed
rolls are withdrawn from said platen while said
means have been operated to apply said pressure.
4. In a typing machine having a revoluble
platen, the combination of a feed-roll co-opera
tive with the platen, pivoted arms spaced along
the platen for supporting the feed-roll and press"
55 ing it against the platen, an externally screw~
threaded cross-rod connected to and extending
between said pivoted arms, a draw-spring for
pressing said feed-roll against the platen and
having one end seated in the cross-rod thread,
60 said spring extending transversely from the cross
rod to anchoring means for its other end, the
stretch and force of said spring being adjustable,
for regulating the feed-roll pressure, by locating
the ?rst draw-spring end diiierently along said
65 cross-rod by means of said screw—thread.
5. The invention as set forth in claim 4, said
?rst draw-spring end being withdrawable from
the screw-thread for placement at different points
therealong, and said threaded cross-rod being
rotatable, thereby to cause said screw-thread to
adjust said first spring end therealong.
6. In a typing machine, the combination of a
revoluble platen, two feed-roll sets spaced circum
ferentially of the platen, two laterally-spaced,
75 pivoted supporting arms for each feed-roll set, a
spaced rocker-arms for each line of feed-rolls, “
a cross~rod connecting the rocker-arms that are
associated with each line of feed-rolls, each cross
cross-rods having spring-end-receiving stations
distributed longitudinally thereof, one end of the
draw-spring being differentially locatable by
means of said stations, to slant the spring differ 45
entially across said cross-rods for adjusting the
spring-pressure.
9. In a typing machine, the combination with a
platen-roll, of two normally-spring-pressed feed
roll lines spaced circumferentially of the platen, 50
a leaf-spring connected across said two feed-roll
lines to serve for pressing both feed-roll lines
against the platen, and means settable at will to
press against said leaf-spring at a place between 55
said feed-roll lines for optionally augmenting the
normal~spring-pressure of both feed-roll lines,
said set means being restorable at will for re
storing the normal feed-roll pressure.
10. In a typing machine having a platen, the
combination of a feed-roll, an externally-thread
ed rod journaled to extend lengthwise of the
feed-roll axis, and a draw-spring having one end
anchored and having the other end connected to
engage the threads of said rod, said draw-spring 65
acting to press said feed-roll against the platen,
the feed-roll pressure being adjustable by chang
ing the stretch of said draw-spring by di?er
entially locating said other end of the spring
along said rod by means of said thread, either by 70
turning said rod for micrometric adjustment of
said stretch, or by drawing said other spring-end
out of one place of engagement with said threads
and shifting it to another place.
11. In a typing machine, the combination of a 75
2,134,821
platen-roll, two feed-rolls spaced circumferen
tially of the platen-roll, primary spring-means
acting to press said feed-rolls against the platen
roll with ordinary pressure, a secondary spring
device having means, normally in idle condition
for both feed-rolls, for pressing both of said feed
justing the tension of said draw-spring supple
mentally to the tension-adjustment obtained by
retracting said spring-end from one station and
replacing it at another station.
13. In a typewriting machine, the combina
tion with a platen-roll, of a feed-roll, a struc
rolls simultaneously to apply additional spring
ture for supporting and pressing said feed-roll
pressure jointly to both of said feed-rolls, and
against the platen, and a draw-spring having
a controller common to said feed-rolls and differ
connections enabling it to pull upon said struc
ture and in transverse direction of the feed-roll ,
10 entially settable at will to put said additional
pressure-applying means in effective condition
for both feed-rolls, or, conversely, to restore said
additional-pressure-applying means to said nor
mal idle condition.
12. In a typing machine, the combination with
15
the platen-roll, of two feed-roll lines, front and
rear, near the bottom of the platen, laterally
spaced rocker-arms, fulcrumed at a suitable axis,
for each line of feed-rolls, two cross-rods, one
cross-rod connecting the rocker-arms that are
associated with one line of feed-rolls, and the
other cross-rod connecting the rocker-arms that
are associated with the other line of feed-rolls,
each cross-rod being spaced from the companion
rocker-arm axis, and a draw-spring connected
across the cross-rods and acting to press both
lines of feed-rolls against the platen, one of the
rocker-arm-connecting cross-rods having an ex
ternal screw-thread that forms spring-end-re
30 ceiving stations distributed longitudinally there
of, one end of the draw-spring being retractable
from said screw-thread for quick lateral shift of
said end from one station to another, to slant the
spring differentially across said cross-rods for
adjusting the spring-pressure, said screw-thread
ed rod being rotatable for micrometrically ad
axis, said connections including a rod having a
screw-thread along and by means of which one
end of said spring is shiftable laterally to vary
the transverse direction in which said spring
pulls, and thereby vary its pull to regulate the lo
feed-roll pressure effected by said draw-spring.
14. In a typewriting machine or the like, in
combination, a structure adapted to be spring
forced, an externally-threaded screw-rod, and a
spring-device cooperating therewith to spring
force said structure, said spring~device includ
ing an element having two ends, one end being
differentially loca-table, relatively to the other,
on and along said rod by means of said screw
thread so as to slant said element differentially .113
to said rod and thereby vary the stretch and re
sultant force of said spring-device, said ?rst
mentioned element-end being adapted to be dis
engageable from said screw-thread at will for a
quick shift to one or another station along said '
thread, said screw-rod being rotatable to screw
shift said ?rst-mentioned element~end along said
thread for regulating micrometrically said stretch
and force.
WILLIAM F. HELMOND.
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