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Патент USA US3077265

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Feb. 12, 1963
3,077,255
R. E. COLEMAN ETAL
TYPING IMPRESSION CONTROL FOR TYPEWRITERS
Filed July 11, 1960
W
ATTORNEY
Feb. 12, 1963V
R. E. COLEMAN ETAL
.
3,077,255 '
TYRING IMPRESSION CONTROL FOR TYREWRITERS
Filed July 11, 1960
5 Sheets-Sheet 2
BY
RUSSELL E. caf/WAN
5v5/R7 Gum/:150m
ATTÚR/VEY: R'
Feb. 12, 1963
R. E. COLEMAN ETAL
3,077,255
TYPING IMPRESSION CONTROL FOR vTYPEWRITERS
Filed July 11. 1960
3 Sheets-Sheet 3
FIGA
FIGS
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:mlr,äl
INVENTORSV
@0:15a E, 60mm/v
BY
,5a/mr s. /m/:fLso/v
ATTORNEY
United States Patent VÖñiice
1
3,077,255
Patented ree. 12, 1963
2
FIG. 10 is a view similar to FIG. 9 showing the parts
3,077,255
TYPEWRITERS
Russell E. Coleman, Elmira, N .Y., and Evert G. Israelson,
Rowayton, Conn., assignors to Sperry Rand Corpora
in another operating position.
TYPING IMPRESSIGN CONTROL FÜR
‘
, Referring to the drawings in detail and in particular
to PIG. l, a conventional power operated type action 10
is shown which coacts with a power roller 11, journalled
tion, New York, N.Y., a corporation of Delaware
Filed July 11, 1960, Ser. No. 41,854
13 Claims. (Cl. 197-17)
in the opposite side frames 12, FIG. 6, of a typewriter,
and comprising a power cam 13, rotatably mounted on
a power arm 14, to engage the roller 1l. The power
14 is connected by suitable linkage in the well
Th.s invention relates to typing impression controls 10 arm
known manner to a character key of the keyboard as
for typewriters and like machines, and more particularly
shown in FIG. 2A of Patent 2,919,007 t-o F. W. Schremp,
to a mechanism for controlling the force of the printing
granted
December 29, 1959. All of the type actions are
impact on the platen and the ribbon by individual ad~
substantially similar in design and operation, and hence
justment of any type bar in either lower or upper case
only a single action will be hereinafter referred to. The
in order to obtain typing of uniform appearance.
rearwardly extending extremity of the power arm 14 is
Normally, typing operations call for the ink impreg~
pivoted
to a camming lever 16 which in turn is pivoted
nated in a typewriter ribbon to be transferred to paper
as at 15’ to the upper end of a vertically disposed impact
through the ribbon upon the impact of a type bar against
control crank 15. A roller 16’ on the end of the lever
the platen. The ink in the ribbon is readily transferable
16
normally engages the angular camming edge of a type
and the paper carried in the typewriter carriage can be
imprinted in varying degrees of intensity as regulated by
20 bar bell crank lever 17 pivoted on a wire 18 in the comb
of a bell crank pivot block 19. The bell crank
the force of impact of the type hars. It is necessary for . portion
lever 17 is provided with a depending arm 20 which is
the applied pressure of each type bar, therefore, to be
normally urged by a spring 21 against a comb stop plate
adjustable in order to produce uniform typing impres»
22, FIG. l. A wire link 23 pivotally connects the upper
sions. Vario-us_devices have been used for adjusting the 25 end
of the bell crank lever 17 to a type `'bar 24, pivoted
force of the impact of the type on the platen, but many
as at 25 in an arcuate type segment or type basket 26.
of these devices have been too complex and expensive,
This segment, slidably disposed between the frames 12,
particularly~where pressure variations are to be adjusted
at an angle of several degrees from the vertical, is low
in upper case as well as in lower case, and retaining this
ered
by the depression of the .usual case shift key on
adjustment during subsequent typing has proven, in
the keyboard for placing the type bars in position to print
many instances, to be diilicult.
upper case characters on a paper held in the usual man
VOne object of Athe invention is to provide an impact
ner against a platen 27, said action lto be more fully ex
impression control for typewriters and like machines,
plained hereinafter in conjunction with the type impact
the adjustment of which can be readily maintained.
adjusting means.
Another object of thev invention is to provide means
A limit strip carrier bar 36 disposed below the power
for controlling the force of impression of each individual
roller 11 and extending virtually the width of the type
type bar.
writer is swingably suspended at opposite ends by shoul
Another object of the invention is to provide a manu
ally adjustable impact impression control operable in
dered screws 31 from the inner faces of levers 32 and 33.
lower case impact adjustment.
bar 3d has its two ends or legs 36 and 37 bent at angles
of 90° to pass loosely through holes 38 in the carrier
bar, FIGS. 2 and 6. The holes 38 are formed by, and
are in axial alignment with, counter bored cavities 40
which penetrate the bar to a maximum depth that will
define an end wall for the cavity of minimum thickness.
The bored cavities 40 are of suitable diameter, FIG. 2,
to permit the legs 36 and 37 of the bail 35 to be swung
freely and to be limited in swinging movement by the en
trance rim of the counter bores at the underside of said
Said levers pivot on a rod 34 which is rigidly mounted
both Eupper and lowercase positions of the type.
40 in and extends between the side frames 12. A limit strip
‘Still another object of the invention is to provide in
bail 35 extending along the top,.longitudinally of theterrelated mechanisms for case shifting and‘impression
center thereof and substantially the length of the carrier
control in a typewriter with independent upper and
_
Further objects and advantages relating to details and
novelties of construction and operation will become ap
parent from the detailed description and accompanying
drawings forming a part of this specification, in which:
FIG. l is a vertical view in section through part of
a power typewriter illustrating an impact impression ad
justing mechanism as applied to a type action,
FIG. 2_ is a view in side elevation with portions shown
partly in section illustrating the relationship of the im~
carrier bar 30.
pact adjusting mechanism shown in FIG. l, to the case
shifting linkage,
_ >
30 and through holes 41, in a limit strip 44, said holes
FIG. 3 is a side view of a case shift mechanism used
> being of greater diameter than the bail. Each leg of the
bail is provided with a ñxed abutment washer 42 against
in connection with the invention,
FIG. 4 is an enlarged view of part of FIG. 3 showing
which springs 43, on said legs, bear in order to yieldably
maintain the limit strip 44 against the lower surface of
the carrier bar 30. One leg 36 of the bail 3S terminates»
in a right angled crank portion 45 and is pivotally secured
another position of the shift mechanism,
FIG. 5 is a section on line 5~-5 of FIG. 4,
FIG. 6 is a vertical section taken on the line 6--6 of
FIG. 2 looking from the front of a typewriter and illus
trating an individual type bar adjusting mechanism,
FIG. 7 is a top plan view of one end of the mecha~
nism shown in FIGURE 6,
65
FIG. 8 is a section taken on the line 8_8 of FIG. 6
illustrating the manner in which a limit strip carrier bar
is anchored to a bell crank pivot block against arcuate
motion,
'
' FIG. 9 is a fragmentary part of the mechanism shown 70
in FIG. _1 and illustrating another form of impact ad
justment means, and
-
The legs 36 and 37 of the bail 35 extend below the bar
.
to one end of a bail rocker 46, the other end of which
is loosely mounted on a case shift bell crank 47, pivoted
as at 48 to a fixed point in the machine. A rearwardly
extending arm 49 of the crank 47 is urged upwardly by
spring 50, and maintained in riding contact with the
lower arcuate edge or surface of a vertically movable seg
ment shaft cam arm 51, FIGS. l, 2 and 3.
v
The impact control crank 15, corresponding to each
key action, is shaped to provide a vertical leg 52 dis-V
posed approximately midway between the power >roll 11
and the pivot block 19, and is formed with a right-angled
3,077,255
base portion 53 which extends horizontally beneath and
parallel to the limit strip 44 and at a predetermined dis
tance therefrom. Each base member 53 provides stag
gered semi-tubular sections 54, internally threaded to aC
commodate'lower case and upper case adjusting screws
4
taining the Iadjustment setting between the screws 55 and
56 and the limit strip 44.
Since the adjustment made possible by this invention
is related to lower and upper case type bar impact, pro
vision is made to synchronously Shift the limit strip 44
in order to align it with the proper screw 55 or 56 as
either case is selected. When a change from lower case
to upper case is desired, a shift key on the keyboard is
the limit strip 44 with every action of the power arm
depressed to lower the type bar segment or basket 26
during typing, thereby throwing off the adjustment of
impact sought. In order to overcome this condition we 10 so that the upper face of the type bar will make an upper
55 and 56, respectively. The adjusting screws after hav
ing been set are likely to turn from constantly hitting
provide a small holding block 57 of resilient material,
preferably nylon, drilled and tapped with close fitting
screw holes for each set of lower and upper case screws,
which block is forced and held against the underside of
each base member 53 to more securely retain the screws
in their adjusted positions.
In order to maintain the leg portions S2 of the cranks
15 evenly spaced from each other and to prohibit any
lateral sway, each leg is disposed in a slot in a comb
bracket 58.
case character impression. Referring specifically to FIGS.
l, 2 and 3 a continuously rotating case shift shaft 80,
dispo-sed below the vertically movable type segment 26,
is journalled in the side frames and driven through suit
able gearing from the drive motor, not shown. The case
shift shaft 80 has keyed thereto adjacent its left extremity
a ratchet gear 81. Directly adjacent said ratchet gear
81, a cam 82 is eccentrically mounted for free movement
on the shaft 80 and has pivoted on the face thereof adja
A spring 60, secured at one end to an ear 20 cent said ratchet 81 a pawl or dog 83, biased by a spring
of each leg 52 is anchored at its opposite `end to a suitably
fixed part of the machine and resiliently -forces the legs
52 against the inner edges of the slots in the comb 58.
84 for engagement with the teeth of the ratchet.
Said
cam S2 rotates in a suitable opening in the shift cam arm
51 so that as the cam 82 rotates about the shift shaft 80
the arm 51 will oscillate vertically to raise or lower the
By its downward pull each spring 60 constantly urges the
entire unit composed of the impact control crank 15 and 25 type basket 26 depending upon the operation of said
ratchet gear 81.
the power arm 14 downwardly toward the power roll 11
The pawl or dog 83 has a tail ‘86 which is arranged
and toward a stop bar such as the one designated at 99
to engage the outside of an ear 87 formed at the free
in FIG. 7 of Patent 2,638,199, granted May 12, 1953, to
end of an upper bell crank 88 of a parallel detent link
F. W. Schremp, but which is not necessary in the use of
30 arrangement which includes a lower lever 89 also having
the present invention.
at its free end an ear or tab 91 the inside of which may
Varying -degrees of force are necessary to throw a.
be engaged by the vtail 86 of the pawl 83 as seen in FIG.
type bar against the ribbon as the number of carbon
copies changes. For example, a minimum of force iS
applied through the power mechanism to drive the type
bar in single sheet copy work compared to a maximum
of force applied when nine or ten carbon copies are to
be reproduced. To meet these conditions we provide
a. combination impression control and impact adjustment
so that the striking power of a type'bar may be closely
4, wherein it will be evident that a blocking pin 92 limits
the rotary movement of the pawl in one direction and
also forms a positive lock stop for rotation of the shift
cam at opposite extremes of its movement in case shift
operations. The ends of bell crank 88 and lever 89 are
joined by a link 93 which insu-res mutual swinging move
ment of the parts when a pull is exerted on the tie rod
regulated after adjustment regardless of the force required 40 94 by operation of the shift lever 96 which is provided
with a shift key finger piece 97 and a latch key 98 for
in accordance with the work to be accomplished. In
engagement with -a latch strip 99 to hold the shift lever
FIG. 1 a type bar impression control is shown which com
96 in selected case position. The normal position of the
prises a knurled hand wheel 65, mounted for free rota
parts is `as depicted in FIG. 3 Where lower case typing
tion on a stud shaft 66 which projects from a side frame
ofthe machine. The wheel 65 has formed integrally 45 ís done. The dog 83 is held out of engagement with
the constantly revolving ratchet gear '81 until the shift
therewith an impact control cam 67 provided on its pe
key 97 is operated to pull on tie-rod 94 to cause bell
riphery with arcuate recesses for engagement by a roller
crank «88 to release the pawl 83 which engages the ratchet
68 on one end of a crank lever 70 suitably pivoted on
gear and transmits rotary motion of the shaft 80 to the
the frame as at 71. The opposite end of the lever 70 is
connected by a link 72 with the free end of lever 32. 50 shift cam 82. The latter rotates one-half a turn to raise
the type basket 26 at which time the parts are in the
It will be evident that as the hand wheel 65 is turned
position shown in FIG. 4 and are so held by reason of
in either clockwise or counterclockwise direction the car
the ear 91 having moved into the path of the tail 86 of
rier bar 30, held by levers 32 and 33 along with the limit
the pawl to free the latter from the ratchet gear and halt
strip 44, will be lifted away from or lowered tow-ards the
adjustment screws 55, 56 to adjust the force with which 55 the rotary movement of the cam 82. When the shift
the type bars strike the paper in printing operation by
changing the driving effect of the roller 16’.
The carrier bar 30 must be retained in a horizontal
plane as it is moved vertically by the studs 31, which have
lever 96 is released a suitable spring will move it to nor~
mal or FIG. 3 position.
In FIGS. 9 and 10 use is made of an Iadjusting means
which includes a case shift bell crank 101 similar tto bell
a slight arcuate motion due to the rocking of the levers 60 crank 47 (FIG. 1) which is actuated by the vertical case
shift movement of the shift cam arm 51 to adjust a bail
32 and 33 around rod 34, so that the operation afforded
rocker
link 102, similar to link 46. The link 102 is
by the screws 55 and 56 will not be altered. In FIGS. 1,
pivoted to the lower end of a rocker yarm 103 secured
6 and 8, means are shown for positively retaining the
to the end of a case shift control shaft 104 which is
carrier bar 30 in horizontal position which includes a
seated in a longitudinal recess 10‘6 in the bell crank pivot
65
plate 73 fixed to the underside of the pivot block 19 and
block 107 which corresponds to the block 19 previouslyy
extending forwardly to a position below one end of the
referred to.n The shaft 104 is slotted or undercut as at
carrier bar 30. A stud screw 74 is threaded into a tapped
108 substantially half its diameter to provide a camming
hole in the carrier bar 30 and extends downwardly to en
action for the impact control ycranks 109, the legs 111
gage a slot 75 in the adjacent edge of the plate 73. The
of which are biased for contact with the shaft 104 by
stud screw 74 being threaded into the threaded hole in 70
the bar 30 permits suitable -adjustment of the bar 30 with
respect to the plate 73. No matter in what direction
individual springs 112.
These cranks are the same as
the cranks 52 previously explained `and are formed at
their lower ends with a base portion 113 having threaded
the levers 32 and 33 are swung the bar 30 will remain
sleeves 114 in which are adjustably mounted upper and'
horizontal by having rotational relation with the studs
lower
case screws 116 and 117, respectively. These
75
31 counter to the direction of lever swing thereby main
apt/'7,255
'screws are arranged to coact with upper and lower case
Isteps 118 and>119»respectively, formed on the bottom
of a limit bar 121, suitably supported at its opposite ends
in the frames of the machine.- The upper end of each
crank 109` is pivoted to thecamming lever 1‘6 of the
power mechanism so that the force of the impact is
closely controlled by the individual adjustment of the
7. A writing machine as set forth in claim 6 including
means for conditioning each of said crank meansV for
upper and lower case operation.
8. A Writing machine as set forth in claim 6 including
means for adjusting said limit means to vary the move
ment of said crank means and control the impact of
the type bars actuated by said type bar operating means.
screws 116 and 117.
9. In a writing machine having type bar operating
It is evident that an upward lift of the power arm 14
will lift the lever 16 which acting as a lever of the third 10 means including movable power arm means and case
shift means; a printing impression control comprising a
class will pull up on crank 15 until its selected screw
type
bar impact control means, lever means fulcrumed
56 or 57 limits on the limit strip 44 of the carrier »bar 30
on said power arm means for first moving said type bar
and then the lifting action of lever 16 will operate the
impact control means and then said type operating means,
bell crank 17. The difference in time that the power is
applied to the type bar as controlled by the movement 15 limit means for arresting the movement .of said impact
control means and transferring the operation of said lever
of crank 15 determines the adjust-ment of impact.
means to said type bar operating means, upper and lower
While we have described what we vconsider to be a
case step means on said limit means, and means con
highly desirable embodiment of our invention, it is obvi`
ous that changes _in form could be made without depart
trolled by said case shift means for moving said impact
described nor to anything less than the whole of our
invention as hereinbefore set forth, and as hereinafter
means and movable power arm means, a printing irri
control means for selected case shift relation with said
ing from _the spirit of the invention and therefore we do 20 step
means.
not limit ourselves to the exact form herein shown or
claimed.
What we claim is:
1. In a writing machine having type -bar operating
means and a movable power ar-m; a printing impression
control comprising impact control means, lever means
fulcrumed on-and actuated by said power arm for oper
l0. In a writing machine including type bar operating
pression control including impact adjusting means, type
bar impact control means and lever means fulcrumed on
said power arm means for actuating said type bar op
erating means and said impact control means, limit means
for arresting the operation of said impact control means
whereby the actuation of said type bar operating means
ating said type bar operating means and said impact 30 is continued through said lever means, and means con
trolled by said impact adjusting means for moving said
control means, and limit means for arresting the opera
tion of said impact control means for modifying the
operation of said type bar operating means through said
lever means.
limit means with respect to said impact control means
for simultaneously varying the operation of said type bar
operating means.
11. A writing machine as set forth in claim l0, in
2. In a writing machine having type bar operating 35
which each of said type bar impact control means in
cludes means adjustable with respect to said limit means
sion control comprising impact control means, lever
for varying the operation of each type bar operating
means fulcrumed on said power arm for ñrst moving
means including a movable power arm; a printing impres
means.
said impact control means and then said type bar oper
l2. A writing machine as set forth in claim 9 including
ating means, and limit means for arresting the movement 40
means in said impact control means adjustable with re
of said impact control means and transferring the opera
spect to said limit means for varying the operation of
tion of said lever means to said type bar operating means.
each type bar operating means in lower and upper case
3. A writing machine as set forth in claim 2' in which
position of said case shift means.
said impact control means includes upper and lower case
13. In a writing machine having case shift means, and
stop means adjustable for varying engagement with said
45 type bar operating means including a movable power arm;
limit means.
a printing impression control comprising impact control
4. A writing machine as set forth in claim 2 in which
means, lever means fulcrumed on and actuated by said
said impact control means includes upper and lower case
power arm for operating said type bar operating means
stop means and means for adjusting said limit means for
engagement by said stop means to selectively control 50 and said impact control means, and limit means for ar
resting the operation of said impact control means for
upper and lower case printing.
5. In a writing machine including type bar operating
means and movable power arm means for actuating said
type bar operating means, a printing impression control in
modifying the operation of said type bar operating means
through said lever means.
14. A writing machine as set forth in claim 13 in
which said limit means comprises a carrier bar, a limit
cluding vertically movable type bar impact control means, 55
strip, bail means for holding said strip longitudinally of
lever means fulcrumed on and operated by said power
arm means for actuating said type bar operating means
and said impact control means, limit means for arrest
the bottom of said bar, and limit strip adjusting means
including an adjusting cam for moving said bar vertically
for defining different limits for operation of said impact
control means, said limit strip adjusting means coacting
ing the vertical movement of said impact control means,
and means coacting with said impact control means 60
with the case shift means to adjust the position of the
and the limit means for adjusting the vertical movement
limit strip upon operating of the case shift means.
of said impact con-trol means for varying the operation
15. In a writing machine having case shift means and
of said type Abar operating means through said lever
means.
type bar operating means including a movable power
arm; a printing impression control comprising impact
6. In a writing machine having a plurality of type bar
operating means and a movable power arm for each of 65 control means, lever means fulcrumed on said power arm
for first lifting said impact control means and then actu
ating said type bar operating means, limit: means pre
senting a stepped surface representing upper and lower
fulcrumed on and operate-d by each power arm for op
caes, means adjustable in said impact control means for
erating each type bar operating means and vertically
movable crank means on each of said lever means, limit 70 engaging the stepped surface of the limit means to ar
rest a rising movement of said impact control means and
means for arresting the movement of all of said crank
slotted shaft means operated by said case shift means for
swinging said impact control means to place said adjusta
swinging said impact control means to place said adjusta
adjusting the movement thereof in relation to said limit
ble means in selected relation to the steps of said limit
means.
said type bar operating means; a printing impression con
trol comprising an impact control including lever means
75 means.
3,0
7
16. In a writing machine including type baropei'ating
means and movable power arm means; a printing im
pression control comprising type «bar impact control
means including upper and lower case stop means, lever
means fulcrumed on said power arm means for actuat
ing said type Ibar operating means and said impact con
trol means, limit means for arresting the operation of
said impact control means whereby the actuation of said
type bar operating means -is continued through said lever
8.
means for selective engagement with the limit means of
`said upper and llower case istop means.
»
'
`
1S. In a writing machine including type bar operat~
ing means, case shift means, and mova‘ble power arm
means; a printing impression control comprising type bar
impact control means, lever means fulcrumed on said
power arm means for actuating said type bar operating
means and said impact control means, carrier bar means,
alimit strip slidable laterally of said carrier bar means
means, and means for adjusting said limit means for 10 for arresting the operation of said impact control means
whereiby the actuation of said type bar operating means
movement toward and away from said limit stop means.
17. In a writing machine including type bar operating
means and movable power arm means, a printing im
pression control comprising type bar impact control
means including upper and lower case `stop means, lever
means fulcrfurned on said power arm meanslfor actuat
ing said ty-pe -bar operating means and said impact con
trol means, limit means for arresting the operation of
said impact control means whereby the actuation of said
type bar operating means is continued through said lever 2
means, and means for adjusting said impact control
is continued through said lever means, and means con~
trolled by the :case shift means for moving said limit
strip.
References Cited in the lfile of this patent
UNITED STATES PATENTS
2,796,966
2,818,151
2,89'1,650
Toeppen ____________ __ June 25, 1957
Yaeger _____________ __ Dec. 3l, 1957
Ascoli ______________ .__ June 23, 1959
UNITED STATES PATENT OFFICE
CERTIFICATE 0F CORRECTION
Patent No. 3,077,255
February l2, 1963
Russell E. Coleman et al.
It is hereby certified that error appears in the above numbered pat
ent requiring correction and that the said Letters Patent should read as
corrected below.
Column 5, line 73, strike out "swinging said impact con~
trol means to place said adjusta-" and insert instead -~ means
and means on each of said crank means for --.
Signed and sealed this 25th day of February 1964.
(SEAL)
fittest:
ERNEST W. SWIDER
EDWIN L. REYNOLDS
Altesting Officer
Ac „ing Commissioner of Patents
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