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Патент USA US2411050

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Nov. l2,_ 1946. r
'
Y
o. MEHAN
2,411,050
CALCULATING MACHINE?
Filed Dec. 25, 1940
10 Sheets-Sheet l
NOV. '12, 1946.
2,411,050
T_ Q_ MEHAN
CALCULATING MACHINE
Filed Dec. 23, I940
10 Sheets-Sheet 2
INVENTOR.
_
7 mas-0. We?.
A?...
-
I
Y
ATTORNE Y.
Nov. 12, 1946. ,
2,411,050
T. O. MEHAN
CALCULATING MACHINE
Filed Dec. 23, 1940
10 Sheets-Sheet 5
INVENTOR.
f/xama Q/Ve/Zm
Nov. 12, 1946.
T, o, MEHAN
2,411,050
CALCULATING MACHINE
Filed Bed. 23, 1940
10 Sheets-Sheet 4
INVENTOR.
ATTORNEY.
Nov. 12, 1946.
T. o. MEHAN
2,411,050
CALCULATING MACHINE
Filed Dec. 23, 1940
10 Sheets-Sheet 5
IN VENTOR.
Nov. 12, 1946.?
T.O.MEHAN
2,411,050
CALCULATING MACHINE
Filed Dec. 23, 1940
10 Sheets-Sheet 6
INVENTOR
Nov. 12, 1946.
-
T_ 0,. MEHAN
> 2,411,050
CALCULATING MACHINE
Filed Dec. 25, 1940
LA
10 Sheets-Sheet 7
Nov. 12, 1946.
2,411,050
T. O. MEHAN
CALCULATING MACHINE
Filed Dec. 23, 1940
10 Sheets-Sheet 8
INVENTOR.
BY f/iama (2276mm
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"
iii
Nov. 12, 1946.
T'. o. MEHAN
2,411,050
CALCULATING MACHINE
Filed Dec. 25, 1940
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10 sheets-sheet 9
?Now-12,1946.
~
?T.'O.MEHAN
'
2,411,050
- CALCULATING ?MACHINE
' Filed?Dec'. 25,v 1940
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10 Sheets-Sheet 1O
Patented Nov. 12, 1946
2,411,050
UNITED STATES PATENT OFFICE
2,411,050
CALCULATING MACHINE
Thomas O. Mehan, Chicago, 111., assignor to
Victor Adding Machine Company, Chicago, 111.,
a corporation of Illinois
Application December 23, 1940, Serial No. 371,366
1 Claim.
1
(Cl. 235-60)
2
This invention relates generally to improve
for use with this machine is also shown in the
ments in calculating machines and more particu
same co~pending application. As this inven
tion is particularly concerned with. that part of
the machine which performs the addition and
subtraction, subject to the control of the key
board unit, only so much of the machine as is
necessary for the understanding of the present
invention is disclosed herein.
larly to adding and subtracting mechanisms for
use in such machines.
The general object of the invention is to pro
vide adding and subtracting mechanisms designed particularly for compact arrangement in
portable calculating machines.
Other objects and advantages of the machine
Frame
will be mentioned hereinafter or will become ap 10
parent from a perusal of the speci?cation and
The frame employed with the present invention
comprises a base plate 1 on which are mounted
drawings, wherein a preferred form of the inven
a pair of outside vertical frame plates 2 and 3
tion has been illustrated and described.
and a pair of intermediate vertical frame plates 4
Fig. 1 is a front elevation of a partial assembly
of the adding and subtracting mechanisms here 15 and 53. Preferably, a plurality of projections such
as G on the vertical plates will extend through cor
inafter described.
responding slots in the base plate and will be
Fig. 2 is a vertical sectional view substantially
swaged over to lock the frame plates together.
on the plane of the broken line 2-2 of Fig. 1.
The keyboard unit fully described in the above
Fig. 3 is a vertical sectional view substantially
on the plane of the line 2?2 of Fig. 1, looking in 20 mentioned application, is shown in part in Fig. 2
in order that its operative relation to the present
a direction opposite to that on which Fig. 2 is
invention may be clearly understood.
taken.
.
The outside vertical frame plates are employed
Fig. 4 is a side elevation taken at the left side
of Fig. 1.
not only in supporting the keyboard unit, but
also in furnishing the pivotal support for the total
Fig. 5 is a side elevation taken from the right
side of Fig. 1.
key and for the repeat and subtracting keys, and
in addition thereto, the support for the ribbon
Fig. 6 is a side elevation of a few elements nor
mechanism, as will be better understood by refer
mally mounted on the main shaft in the fore
ence to the above mentioned co-pending appli
ground of Fig. 5.
Fig. 7 is a front elevation of the main shaft 30 cation.
assembly.
The full stroke mechanism preferably employed
in connection with the present invention is that
Fig. 8 is a right elevation of the same assembly.
Which is shown in my aforesaid application, Serial
Fig. 9 is a partial side elevation of the left side
No. 282,787.
of the machine, emphasizing the subtractor key
Printing mechanism
and associated mechanisms.
35
Fig. 10 is an assembly view in elevation taken
Controlled in their rearward travel by the key
from the right side of the machine, emphasizing
stems such as 'i are the stop slides 8, one for
the total key and associated mechanism con
each bank of numeral keys. A comb 9, mounted
trolled thereby.
Fig. 11 is a plan view of the accumulator swing
ing frame assembly.
Fig. 12 is a side elevation of the same assembly.
Fig. 13 is a side elevation of the shiftable ac
cumulator assembly itself.
Fig. 14 is a front elevation of the Zero elimina
tor assembly.
on the cross channel member i i spaces and guides
40 the set of stop slides. Each slide is normally
urged rearwardly by a coil spring l2 connected
to the comb at any suitable point on the slide.
Laterally extending projections such as 13,
suitably spaced, are provided on each stop slide
45 to engage any key stem which may be depressed
whereby the corresponding number may be
Fig. 15 is a side elevation of the same assembly.
printed by the machine.
Inasmuch as this application is not concerned
Rigidly connected with each stop slide, and off
with the keyboard unit, the details of that com
set to an appropriate extent for each bank, as
plete unit and the frame for supporting it are 50 shown in my aforesaid application, is a bracket
not shown in this application. The keyboard
14 pivotally connected with a rack bar such as
unit which is preferably used with the present
15. The rack bars are spaced and guided by
invention is that which is shown. in my co
combs l6 and i7 rigidly supported in any suitable
pending application, Serial No. 282,787, ?led July
manner by the frame, and are further guided
4, 1939.
Likewise, a ribbon mechanism suitable 55 by the rods 18 and I9 which extend through the
2,411,050
3
accumulator mechanism is brought into oper-'
ative relation with the accumulator sector 31 in
slots 2| and 22, and are urged rearwardly by
springs i2.
As shown in Fig. 2, each rack bar is provided
a manner which will now be described.
The accumulator gears 5i and
and the
zero eliminator gears 53 are mounted in a slid
set 25. The upper set engages teeth 2%?: provided
ing carriage formed of a pair of side plates 5%
on the type carrying wheel 25 which is rotatably
and 55, which support between them the shafts
supported on a shaft 21 carried between the inter
55, El, and 58 on which the gears are individually
mediate frames of the machine. Each type
mounted. Also carried by the side plates fill and
carrying wheel is provided with a set of numeral
types for printing the digits zero to nine, and 10 55. are the accumulator locking plates as and iii,
projections on these plates extending into suit
preferably each set of type will be a single unit
able apertures in the side plates forming the
28 secured by welding, riveting, or otherwise to
hinges on which these plates may rotate to look
the wheel. Also, each type wheel is provided
ing or unlocking position. Each locking plate is
with a set of teeth such as 29 which may be en
provided with a spring such as 52 and 5:3, as
gaged by a bar 3! on the recti?er bail 32 for hold
with a set of lower rack teeth 23 and an upper
ing the type characters in proper alignment
during a printing operation. rl?he operation of
shown in Fig. 3, for holding the plate engaged
against the type characters. This platen
side plates.
The accumulator carriage is adapted to occupy
with the teeth of the accumulator gears when?
ever the accumulator carriage is in its lower in
the recti?er bail is the same as described in my
operative position. These springs are connect
aforesaid co-pending application.
It will be understood that it is preferred to use 20 ed ?with the plates and anchored on the posts 64
and 55 which are likewise carried on the carriage
a swingable platen roll for pressing the paper
be '
mounted oscillatably upon the shaft 33 and
rocked forwardly and downwardly to bear against
a rearward position during adding and total
taking operations and to be slid forwardly for
subtracting operations. Accordingly, it is recip
?which
the? type
is located
characters
at the
in printing
the planeplane.
of the comb
rocably mounted in a swinging accumulator
frame comprising a pair of arms 65 and El se
As in the case of the machine described in my
prior application, the rack bars on any printing
cured to a shaft 68 rotatably supported by the
cordance with the setting of the numeral keys
lowermost extensions of the intermediate frame
plates d and 5. The forward end of each of these
and their coaction with the lateral projections on
arms has an upward extension whose function
the stop slides a.
will later be described. The rearward portions of
Cooperating with the lower teeth on each rack
the swinging frame arms are provided with the
bar is an adding sector designated ?by its teeth
longitudinal slots $5 and ?ii providing slideways
35, and which is mounted rotatably on a shaft
for bosses '52 and i3 provided on the accumulator
36. Each adding sector is mounted coaxially with
carriage plates at and 55. Each of the carriage
and connected through a lost motion mechanism
plates is also provided with a laterally projecting
to an associated accumulator sector 3'5, having
post such as ?ill and it? by means of which the
teeth 33.
Fixed on the same bushing 39 to rotate about 40 carriage is reciprocated in the subtracting oper
ation.
shaft 36 integrally with each adding sector 35
For raising and lowering the accumulator
is a member iii having an offset ear 42 extending
swinging frame, a link 76 is pivotally connected
through a slot d3 provided in the associated ac~
to a post ll provided on an upwardly extending
cumulator sector 37 and aligned so that it may
portion of the accumulator swinging frame arm
strike the straight edge margin of that slot. Each
6?, and the upper end of the link is pivotally con
member iii also has an car 44 to'which is con
operation are enabled to move rearwardly in ac
in.
nected
the associated
a. spring 55accumulator
extending through
sector, the
a slot
other
end of the spring being anchored at M on the ac- V
cumulator sector. Thus the initial rearward
travel of the rack bar will ?rst rotate the adding
sector 35 andv member 15! until the ear 42 strikes
the end of the slot 43, after which the sector 35
and sector ill will rotate together.
56
Accumulator mechanism
7 In an ordinary adding operation after the de
sired numeral keys in the keyboard have been
set, ?the main operating shaft $38 is rotated by the
nected with a post '58 carried by arm '59 ?xed
on the rock shaft ti carried between the inter
mediate frame plates, this latter arm being con
nected by the pin 82 to the accumulator selector
83, this pin being rigidly secured to the arm '59
and extending through a slot 85% in the intermedi- '
ate frame plate 5.7
As shown in Fig. 13 and Fig. 2, the side plates
of the accumulator carriage are provided with
looking slots it], either of which will engage with
the?pin 86 on the adjoining stationary intermedi
ate frame plate of the machine when the ac
cumulator carriage is raised at adding position
handle or by any other suitable power means, 60 or subtracting position.
whereupon the stop slides in the associated rack
bars will begin to move rearwardly, except when
ever held stationary by the zero stops in banks
where no numeral'keys have been set. ?Each as- ?
-
Accumulator carriage shifting
In'brief, the three sets of accumulator gears
are utilized as follows: Those on the shaft 56 are
sociated type ?wheel will ?be rotated by the upper 65 lifted into engagement with the accumulator sec
tor 31 at the beginning of the return stroke in
rack teeth to the proper position to? print the
an adding operation, and lowered out of engage
numeral corresponding to the key'depressed in
ment at the end of the return stroke of the
the associated bank. At the same time, the lower
operating handle. In a total-taking operation,
rackbar teeth will rotate ?rst the adding sector
the accumulator gears on the shaft 56 arelifted
35 and then the accumulator sector 3%?. When
into engagement with the accumulator sector at
the full forward stroke of the handle has been
the beginning of the forward stroke of the oper-?
completed, all of the type wheels will be in posi
ating handle and lowered out of engagement at
tion to print their respective numerals and will
be temporarily locked in position by the recti?er . the beginning of the return stroke. In a sub-'
bail 32. As soon as the'return stroke begins, the 75 total-taking operation, the same accumulator
_ 2,411,050
5
gears are lifted into engagement with the ac
cumulator sector at the beginning of the forward
stroke and held in engagement until the end of
the return stroke, whereupon they are lowered.
For a subtracting operation, the accumulator
carriage is reciprocated forwardly during the
forward stroke of the handle and thereafter the
accumulator gears on the shaft 51 are lifted into
6
lator gears 5| an equal amount as the adding
sectors return to zero.
In order to make certain that the accumulator
swinging frame is positively held in its lower
position during the forward stroke and is held in
its upper position positively during the return
stroke, there is provided a cam 99 shown in dotted
lines in Fig. 5 which will be rotated during the
engagement with the accumulator sector 31 at
forward stroke underneath a cam follower I III
the beginning of the return stroke and dropped 10 and remain in engagement with said cam fol
out of engagement at the conclusion of the return
lower almost to the end of the forward stroke.
stroke. If the next operation is an adding oper
The cam follower is carried on one arm I02 of a
ation, the accumulator carriage will be automat
bell crank, whose other arm I03 is provided with
ically returned to its rearward position during
a pair of notches as shown to engage a post I04
the forward stroke of the handle, but if the next 15 on the upwardly extending portion of the rear
operation should be a total or a subtotal-taking
end of the arm 19 a short distance above the
link pivot ?I8. The accumulator locking bell~
of those two positions will of itself instantly re
crank, consisting of the arms IOI and I03, is
turn the accumulator carriage to its rearward
held resiliently against the post I84 by means of
position. However, if two successive subtraction 20 the Spring I85. Whenever the accumulator
operations are performed, the carriage will re
Swinging frame has been lifted by means of the
operation, the rotation of the total key to either
main in the forward position for the second oper
ation if the subtraction key has again been actu
ated for that operation.
Accumulator selector mechanism
accumulator selector 83 as described above in
connection with an adding operation, or other
wise, the upper notch on the bell crank will hold
25 the accumulators in the upper engaged position.
When the return stroke is just being completed,
the lower rear end of the cam plate 99 is posi
In this machine which performs both addi
tioned so that it strikes against the post 82 ?xed
tions and subtractions, I preferably employ the
on the arm ?I9, and as it moves further to the
same accumulator selector mechanism which I 30 completion of the return stroke, it forces the
have shown in my co-pending application, Serial
accumulator frame down to its inoperative posi
No. 282,787, which has been referred to above.
tion, the yielding mounting of the locking arm
So far as adding and total-taking operations are
I83 permitting this to occur. This arm is piv
concerned, this mechanism is actuated by an
oted on the shaft 27 so that it may rock the
operating plate 85 ?xed on the main operating
slight amount necessary.
shaft 48 and carrying an accumulator control
The foregoing description of the operation of
pawl 86 pivotally carried by the plate on a pin
the accumulator selector mechanism applies to
81. The operating plate 85 and the control pawl
an adding operation. So far as the lifting of the
carried thereby are shown in Fig. 8, while the
accumulator frame is concerned, the same de
position of the operating plate when at rest is
scription will apply to a subtracting operation.
shown in dotted lines in Fig. 5. When the ma
The functioning of this selector mechanism in
chine is at rest the tongue 88 on the control pawl
a total key operation will now be described in
rests against the left side of the post 89 ?xed on
connection with the description of the total key
the accumulator selector plate 9|. When the
mechanism.
operating shaft is rotated on the forward stroke 45
Total key operation
of the handle, the righthand notch 92 in the
accumulator selector pawl passes underneath the
he locking mechanism employed for locking
post 89 without pushing against the same, and
the total key either in neutral, in total, or in sub
as it moves beyond that position, the spring 93
total position is the same as that shown in my
attached to the control pawl tends to rotate the
co-pending application Serial No. 282,787, above
pawl in the direction shown in the assembly
mentioned, and therefore will not be described
view of Fig. 8. When the forward stroke has
herein. Also, for the same reason, the mechanism
been completed, the left side of the tongue 88
by which the total key, when rotated either to
on the pawl is then resting underneath the post
total or sub-total position, clears the keyboard,
94 at the forward end of the accumulator se
likewise will not be described here.
lector plate 9I. When the return stroke begins,
While it will be recognized that in principle
the lefthand notch 95 in the control pawl will
and in construction there is considerable identity
then engage the post 84 and lift it, thereby rock
between the total key mechanism shown in my
ing the accumulator selector plate about its pivot
application 282,787 and that shown herein, a de
95 in a clockwise direction as viewed in Fig. 5. 60 scription of the remainder of the mechanism will
At this time, inasmuch as the notch 91 in the
be required herein because of its relation to the
left side?of the accumulator selector is engaged
different accumulator mechanism which this
with a post 98 carried by the accumulator se
speci?cation discloses.
lector plate, the rotation of the latter plate will
. -..e total key III, shown in neutral position
lift the accumulator selector 83, whereupon the
"gs. 5 and 10, from which it is rotatable for
accumulator swinging frame will be raised
wardly to total position or rearwardly to sub-total
through thecooperation of the post 82 which
connects selector 83 with arm ?I9 (Fig. 3) and the
link ?I6 connected at TI to the swinging frame
arm 6?. This brings the accumulators on shaft
56 into engagement with the adding sector teeth
position, is attached to a stem H2 secured to a
bail H3 pivoted at lid. The lower end of one
leg of the bail H3 carries a post H5 extending
through a slot I I6 of a bell crank arm I I?! pivoted
at I i 3. When the total key is rotated to sub-total
position the post 5 i5 acting on slot 5 it will rotate
the bell crank counter~clockwise, as viewed in
38. Thereby, when the return stroke is taking
place, the various adding sectors which have
been rotated from zero position during the for
Fig. 5, to place the lowermost edge of the bell
ward stroke, will rotate their associated accumu 7:5 crank arm I I8 in position to be engaged by a short
2,411,050 7
7
.
post I2I on the side of the accumulator selector
control pawl 86 as the forward stroke is being
completed, where-by on the return stroke the left
notch 55 of the pawl will be held down out of
engagement with post 913 of the accumulator se
frame (Fig. 3) immediately at the beginning of
the forward stroke. This brings the accumulators
on shaft 56 into engagement with their associated
adding sectors 31, whereby the rotation of each
accumulator toward its zero position by the action
lector .plate 85. If the notch 95 were permitted
to engage and lift the post 355 at this time on the
of the spring-propelled rack bars during the for
ward stroke will allow a corresponding rotation
of the type wheels and cause the printing type
wheels to print the amount therein registered at
rocked clockwise, causing the selector 3-? to be
lowered, which would thereby cause the accumu 10 the end of the forward stroke.
As just explained above, the rotation of the
lators to drop down at the beginning of the return
total key to sub-total position has also swung
stroke, as is done in a total taking operation.
the lever H9 rearwardly, so that it will prevent
Describing further the sub-total operation, the
total
rotated rearwardly either before or
the accumulator lock arm I83 from releasing the
after the ?numeral keys have been set in the key 15 accumulators at the beginning of the return
s ,roke. Accordingly, the accumulators remain in
board, ?whereupon the rotation of the key to sub
engagement with the adding sectors to the end
total position will rock the total control lever,
generally indicated as 522 in Figs. 5 and
about
of the return stroke and thereby re-accumulate
the sums which they previously contained.
the axis ?I23. The total control lever proper,
The total key is always returned to neutral po
designated I22, has its upper end formed as the 20
sition by a spring I44 connected directly to the
left leg of a bail IM pivoted at I23, the right and
shorter leg of the bail having a rearward exten
total key, and the accumulators will be forced out
of engagement with the adding sectors just at
si?o'n I25 carrying a post 52% positioned to slide
the end of the return stroke by the bumping of
in a ?reshaped slot Illl formed in one leg of the
total key bail I
this leg being designated as 25 the lower end of the cam 99 against the post 82,
as explained above in connection with an or
5'23, being riveted or otherwise secured directly
dinary adding operation.
to the key stem I l2 and pivoting about the shaft
The function of the slot I45 provided in the
us. ?The action of the slot I27 on the post I26,
whether the rotation be to sub-total or total posi
total control lever will be described later in the
tion, has the effect of rotating the total control
description of the zero eliminators,
return stroke, the accumulator plate 1%? would be
For a total-taking operation, the total key is
rotated forwardly. The movement of the V
shaped slot I2?! acting on post I25 will rotate the
further operation, but the mechanism for that
bail? I243, causing the total control lever I22 to
purpose is the same as is described in my ?co 35 rotate counter-clockwise just as in the sub
total operation. However, the post I IE will move
pending application 282,787.
through the slot ?'6 in the bell crank arm 'I I7
Referring further to the total control lever, the
without causing the arm I I9 to rotate, as it does
forward leg I29 of this lever is connected by link
in a sub-total operation. The rotation of the
I3I to an arm I32 secured on a rock shaft I33
lever I22 in a counter-clockwise direction as
viewed in Fig. 5 and Fig. 10. At the same time,
the keyboard will be cleared and locked against
which serves the purpose of releasing the zero 40 total control lever causes the link I39 to throw
stop 5343 (see Fig. 2) which, except in a totalizing
the accumulator selector '83? to the right, as
operation, engages the ear I39 on the rack bar
to the extreme left in the bank of rack bars, this
viewed in Fig. 5, engaging the notch I42 with the
post I43. Therefore, at the beginning? of the for
zero stop being pivoted at I35 and held normally
ward stroke, the accumulators on the shaft '55
When thus released "
this
engaged
rack by
bar,a not
spring
associated with any stop slide
or key bank, will be drawn rearwardly by its
spring i?il to the extent determined by the sum,
tated back to zero by the adding sectors, and their
total will be printed at the end of the forward
stroke when the rockable platen is brought into
engagement with the type wheels.
if any, accumulated in its associated accumulator
by tens transfers from the highest key bank on
its right, and thus its type wheel may print such
sum.
In View of the fact that the arm IIB has not
been rotated by the total key, the accumulator
control pawl will strike the post 94 at the be
ginning of the return stroke to thereby raise it
and rotate the accumulator selector plate 9|
clockwise, thereby lowering and releasing the ac
cumulators. Thus, the accumulators, having
'
If the accumulator carriage is in subtraction
position, the rotation of the total control lever
will cause ?nger � at the bottom thereof to push
rearwardly on the post I 3i" ?xed on the pivoted
arm 538.
This arm pivots on shaft 35, and the
been restored to zero on the forward wstroke, will
slot in its lower end, engaging the post ?l5 on the
accumulator carriage, will thereby slide the car
riage rearwardly to total position.
I
A further and'primary function of the shifting
of the control lever is to cause the link I39, piv
otally connecting post �? on the control lever
and post MI on the accumulator selector 88, to
?cause the selector to rotate rearwardly whereby
the notch I�on the selector will engage the post
I43 on the accumulator selector plate SI and ro
tate'the latter a small amount in a clockwise
direction. as Fig. 5 is viewed. Thereafter, when
will engage ?the adding sectors. During the for
ward stroke each of the accumulators will be ro
not ?be disturbed during the return stroke.
60
The arm I46 shown in Fig. 10 having a curved
slot III?! and a central notch I48, is provided for
the purpose ?of locking the total key against op
eration while the subtraction key is in subtract
ing position. Accordingly, this arm? I46 is fixed
on a shaft I49 and is positively rotated down
wardly by the operation of the subtraction key
to bring the notch I43? into engagement with a
post I5I extending from the side of the key stem
plate H2.
thev forward stroke begins, the forward rotation 70
Subtraction and repeat key ?
the operating plate 85, which carries the se
The key I52 fixed on the key's'tem I53 serves as
lector pawl 86, will cause the right-hand notch
a'repeat key when rocked forwardly, as in the
of the pawl to engage the post 39 and lift upon
aforesaid application ?Serial No. 282,787, and
it to lift the selector 83 and thereby post 82, the
when rocked. re'arwardly it ?sets up'the ?mechanism
arm ?I9, link 16, and the accumulator swinging
2,411,056
for a subtraction operation. The key is .pivoted
at I54 and is provided with the notched projec
tion I55 shown in Fig. 9 which cooperates with
the follower I59 on the arm I51 to hold the key
in neutral, forward, or rearward position, the arm
engagement with projection I81 during the com~
pletion of the forward stroke and until near the
end of the return stroke, as the follower rides
over the periphery of the cam. A post I93 ex
tending through the slot I94 in the locking arm
being pivoted at I59 and being urged toward the
key by the spring I59 anchored at I?I. ?When
and having an enlarged head bearing against the
face of the locking arm is provided to guide the
ever the key is rocked to subtract position a pin
locking arm in its oscillatory movement.
I62 travelling in slot I63 in arm I64, ?xed on shaft
The key I52, unless held in subtraction posi
I49, will lock the total key in neutral, as previous 10 tion by the operator, is automatically returned to
ly explained.
neutral during the return stroke in the following
The key I52 has a depending leg or ?nger I95
manner: The arm I51 whose follower I55 engages
whose function is to prevent the release of keys
the notched edge of the key stem to hold it re
which have been set in the keyboard when it is
leasasbly in either of its three positions has con
desired to repeat the addition of a sum set up 15 nected with it at the pivot I95 a link I99, whose
therein. A plate I66, shown wholly in dotted
other end is connected to the pivot I91 of a dog
lines in Fig. 9, and pivoted at M51, is secured at
I99 pivotally carried on a rocking plate I99 rock
its forward upper end I98 to a bar 599 which ex
ably mounted on the ?xed post �. A spring
tends across the machine in position to strike all
2m, connected with the dog as shown and an
of the key lock slides thereby releasing the set 20 chored on the post 292, likewise carried on the
key stems, if the repeat key is not in repeat posi
plate I99, normally urges the dog in the direc
tion. A plate I1I, mounted on the main operat
tion indicated in Fig. 9. Hence, during a forward
ing shaft 48 to rotate in unison therewith, carries
stroke, the post I12 will rotate the dog I98 against
a post I12 which will operate the keyboard clear
the action of its spring and'pass thereunder with
ing bar on the return stroke, normally. A dog 25 out pushing on ?the link I96. But on the return
I 13 pivotally carried at I 14 on the rear extremity
stroke of the plate Ill and post I12, the latter
of plate I96 is normally held by a spring I15 so
will strike the lower end of the dog I98 and lift
that its upper end rests against a laterally pro
it, since its upper end bears against the sleeve
jecting ear I16 on the plate I69. When the plate
299 surrounding the post I61. This lifting of
I1I' rotates forwardly with shaft 48 the post I12 30 the dog pushes on the link I95 and releases the
strikes ?but passes under the lower end of the
follower I55, whereupon the key stem is restored
spring held dog I13, but on the return stroke the
to normal by the action of the spring I15 caus
dog is struck again and since it bears against the
ing the pin I11 to bear against the lower end of
ear I16 the dog and plate I96 are rotated about
the dog �, whose upper end pushing against
the pivot I61 to release the keyboard.
35 post I19 will restore the key to normal or neutral
However, if the repeat key had been rotated
forwardly, the ?nger IE5 at its lower end would
have engaged the post I11 on the side of dog I13
position.
At the same time, as the key I52 rotates to neu
tral position, the lower end of dog I13 will drop
and rotated the latter so far counter-clockwise
down into its normal position in time to be en
(Fig. 9) that the dog would entirely clear the post 40 gaged by the post I12 on cam I 'II and causing
I 12, thus avoiding any release of the keyboard.
the release of the keyboard as the plate I98 is
A plate I18 is secured rigidly to the key stem
rotated clockwise.
I53 in spaced relation by posts I19 and IBI. A
On the forward stroke, cam I9I, which is ro
curved slot I*82 in plate I18 is provided so that
tatably mounted on shaft 48, is pulled forwardly
the plate may rotate relatively to a post I93
by a latch I89 engaged with an ear I89? on a
mounted on the adjoining vertical frame member
plate I99 which is ?xed on the shaft. The latch
and pivotally carrying a dog I84 whose upper end
is pivoted at 991? on a post carried by cam I9I
will be engaged by the post I19 when the key is
and extending through slot I99? in the ?xed plate
rotated to subtraction position, thereby rotating
5 99. The spring 299 is connected as shown with
the lower end of the dog clockwise (Fig. 9). As
the latch and anchored on the fixed plate so
the dog is thus rotated, its lower end will strike
that when the parts are at rest, the cam rests
the post I11 on the side of the dog I13 and will
against the stationary post 299'. During the for
rotate the latter out of the path of the post I12
ward stroke, the rear end of the latch ?I89 will
on the plate I1 I. ~Hence, if the operator desires to
strike the pin I92 on the key locking arm I85,
repeat a subtraction and will hold the subtraction .
thereby releasing the latch, whereupon the spring
key so that it will not be released at the end of
299 will draw the cam I9I rearwardly to the ex
the return stroke, the keyboard will not be
tent permitted by the travel of the pivot post
cleared. If the subtraction key were allowed to
I91? in the slot I99?. However, the key locking
be returned automatically to neutral position
arm will still be held up by ?the cam I9I during
during the return stroke, the keyboard would be 60 the remainder of the forward stroke.
cleared.
On the return stroke, in View of the fact that
The key I52, if in neutral position at the time
cam I9I has been withdrawn rearwardly by spring
the forward stroke begins, will be locked against
299, the cam follower I92 on the key locking arm
rotation to the subtraction position, or if in sub
will ride off the edge of the cam sooner than
traction position at the beginning of the forward 65 if the cam had not been retracted. This release
stroke, will be locked against, rotation therefrom
of the key locking arm is thus timed in such a
by means of a locking arm I85 pivoted at I89
which cooperates with the projection I31 on the
bottom of the plate I18. The spring I98, an
chored on a post I89 supported by the adjoining
side frame plate, normally holds this locking arm
in lowered inoperative position, but as the main
shaft 48 rotates forwardly, the cam plate I9I will
strike a follower I92 carried on the side of the
locking arm to thereby raise the locking arm into 75
manner that as the locking arm drops down, the
subtraction key may be restored to normal dur
ing the remainder of the return stroke, as just
above described.
A further result of the rotation of the key to
subtraction position is noted in the action of a
post 294, which is ?xed on the plate I18, as it
strikes the upper end of the vertical lever 295
pivoted on the side frame at I93. The clock
5,411,056
11
T2
wise rotation of this lever causes the pin 206,
carried in its lowered end and engaging the U4
shaped slot 26?, to rotate the bail arm 208 piv
oted at 289 in a counter-clockwise direction (Fig.
9). The other arm 2H of the bail has a bifur
plained, on the return stroke, which will leave the
arm 233 and shifter arm 235 in the position shown
in dotted lines in Fig. 4. When the subtraction
key is restored to neutral the link 226 and the
bail to which it is connected will be restored to
cated or slotted end which engages a pin 2l2
the position shown in Fig. 4.
on a bell crank generally indicated as 2l3 piv
oted at 2 l4, and whose other arm 2l5 is likewise
bifurcated to engage the pin 2! 3 in the lower end
If the key H52 is still held in subtraction posi
tion or is restored thereto while the carriage is
still in subtraction position, the downward move
'
'
of an arm 2i? ?xed on a rock shaft 2l8 (Figs. 4 10 ment of the link 226 will rock the arm 233 coun
and 9). As shown in Fig. 3, the rock shaft 2H3
being thus rotated in a counter-clockwise direc
tion (Fig. 4) will cause another arm 2i9 ?xed
on the same rock shaft to press downwardly in
ter-clockwise so that the hook 226 will be raised
above the path oftravel of post 243 during the
forward stroke. > However, if the key is in neutral
position, the post 243 will engage this hook dur
the slot 2!! in the plate 222 by means of its post 15 ing the forward stroke, pull the link 233 for
wardly, rocking the shifter arm 225 clockwise, and
229.
thereby restore the carriage to adding or total
This movement of the arm H9 in a counter
position before the forward stroke is completed.
clockwise direction pulls downwardly on plate 222,
Thus the accumulators will be automatically re
which has a central slot surrounding the type
wheel shaft 27, and the slot 223 in this plate will 20 stored to position to perform addition if an adding
operation follows the subtraction operation. This
acton pin 224 to rotate the signal type wheel 225
will leave the parts in the position shown by full
(Fig. 3) counter-clockwise a su?icient distance
lines in Fig. 4. A spring 24'! bears against post
to bring the minus sign type to the printing posi
248, is wound around the pivot 234 and hooks over
tion, to indicate that a sum has been subtracted
in the operation. At this point it may be stated 25 the link 233 to urge the latter in a clockwise di
that the rock shaft 2"; does not move when the
total key is operated to sub-total or total position,
and although the signal type wheel is rotated, the
pin 220 in the slot 22| will not interfere with the
movement of the signal type wheel and the plate 30
222 which moves along with it.
rection. Thus, the rear end of the arm will bear
either against the post 23I, or when the carriage
is in forward position and the key � in neutral
position, the post 248 will limit the clockwise rota
tion of the link. The shifter arm is releasably
locked in either position by the arm 249 pivoted
at 2A9? bearing against pin 250 on the shifter arm
It has been explained above how the operation
under the downward. pull of spring 25L ,
of the total key will positively return the accu
mulator carriage to normal total-taking (or add
Ac?cumulators
ing) position if the carriage should happen to 35
Whether the accumulator carriage is in its rear
be in subtraction position when a total is next
ward adding position or in its forward subtraction
desired, that is the ?nger I31 (Figs. 6 and 10)
position, the accumulators when dropped down
?will thrust against post I31?.
always are held locked by the locking plates 59
It will now be explained how the carriage is
and BI, best shown in Fig. 2. Whenever the ac
shifted to subtraction position. When key I52 is
cumulators are raised for engagement with the
rotated rearwardly, the post 204 rotating inte
accumulator sector teeth 38, these locking plates
grally with it rocks arm 205 and the bail having
will become disengaged from the accumulators
arms 208 .and 2H, as previously explained. As
when the ears 252 (Fig. 5) strike against the
the bail rotates counter-clockwise (Figs. 9 and 4)
upper margin of the slot 253 in the right-hand
about its axis 209, the link 226 pivotally con
intermediate vertical frame plate 5. The pivotal
nected at 221 to the bail will be pulled down
support for the locking plates is shown in Fig.
wardly, guided by its slot 228 on the pin 223.
5 at 254.
The laterally extending post 23! carried by the
In an adding operation, each accumulator on
link will push down the rear end 232 of the arm
the ?shaft 56, being engaged with the accumulator
generally indicated as 233 pivotally carried at '
sector teeth 38, will be rotated to an extent de
234 on the accumulator ?carriage shifter arm 235,
termined by the rearward travel of the associated
which itself is pivotally supported at 236. The
rack bar, which in turn moves to the extent de
extent of the movement of the arm 233 is such
termined by the keys in its own?bank.
as to rotate it high enough that the upstanding
In a total-taking operation the rack bars are
projection 23?! on the arm may be engaged by
released for rearward movement by their ?springs
the post 233 as the latter is rotated rearwardly
l2, and the extent to which they may travel will
during the forward stroke of the machine. rIhe
be determined by the associated carrier pawl act
post 238 is ?xed on one end of a lever 239 pivoted
ing on the carrier cam ?which is integral with
on the frame at 24i and having an open ended
slot 242 which is constantly engaged by a post 243 60 each accumulator wheel. ?Referring to Figs. 2,
11, and 13, it will be observed that each of the
?xed on the side of a cam plate 244 mounted on
accumulator gears 51 on the shaft 56 carries in
shaft 48 and rotating therewith. As shown in
tegrally with it a cam 255 which has a projection
Fig. 4 the shifter arm 235 has a slot 245 in its
?256 for cooperation with the ?carrier pawl. ?The
lowered end and which is constantly engaged with
carrier pawl itself is shown in Fig. 2 as 251, piv
a pin 14 ?xed on the left side of the accumulator
oted for oscillation about a shaft 258, and having
carriage. Consequently, When the key I52 has
a cam follower projection 259 which rideslon ?the
been rotated to subtraction position and the arm
carrier cam whenever the ?accumulators ilil are
?233 rocked upwardly and the forward stroke
raised. The spring 25,! insures this contact of
thereafter initiated, post 238 will push against
the shoulder 23'! to thereby push arm 233 bodily For the pawl and cam. 'Whenthe accumulator is
being rotated toward ?zero during .a, total-taking
rearwardly, rocking the shifter arm 235 about
operation, 'it may continue to rotate :until the
its pivot 236, thus throwing the accumulator car
*nose 259 of the carrier pawl Sstrikesthe radially
riage to the forward subtraction position. If the
extending face of the carrier cam projection 256.
key is not manually held in subtraction position,
_This is at the zero position of the accumulator. 1
it will be automatically released, as heretofore ex
13
2,411,050
Of course, it will be understood that in a sub
total operation after each accumulator has been
rotated to zero and stopped by the above de
scribed cooperation between its carrier pawl and
cam projection 256, the return stroke of the
machine, with the accumulators still engaged
with the accumulator sectors, will restore each
accumulator to the position formerly occupied
arms 66 and 67 will bump against the lower?
portions of the carrier pawl locking dogs 212.
(Fig. 2) and rotate each of them, if previously?
displaced back to the position shown in Fig. 2..
However, if any of the carrier pawls have been.
lifted, they will still remain raised because of the:
engagement of the notches 276 with the ears 2l5.~
The carrier pawls are restored to their normal.
by it before the sub-total was taken.
position as follows: Referring to Figs. 2, 3, 6, and.
The tens transfer is accomplished as follows: 10 8 it will be observed that the plate 85 ?xed on
During an adding operation the accumulators on
the main operating shaft carries a post 271 which.
the shaft 52 are raised and meshed with the ac
at the normal position lies in a notch 218 in the
cumulator sector teeth 38 at the beginning of
carrier restore pawl 279. This pawl is pivotally'
the return stroke. The rack bars having moved
rearwardly in accordance with the key setting 15 carried at 26| on the plate 282 which in turn.
is pivoted on the rock shaft 2E8. The spring 283;
in their associated banks are restored to their
connected to the pawl and plate serves to hold
normal forward position by means of the rack
the
pawl against post .217. The plate 282 whose
restore bail 262. This bail is carried on a pair
rearward extremity normally rests against the.
of arms pivoted on the shaft 27, one of the arms
263 being disposed outside of the right-hand 20 post H8 constitutes one leg of a bail having a
cross bar 264 held downwardly by the spring 285,.
intermediate frame plate, and the other 264 being
and whose other leg is the arm 286 pivotally
mounted outside the left-hand intermediate frame
connected at 281 to a link 238 pivotally con
plate.
The latter arm is provided with a gear
sector 265 meshing with another gear sector 266
mounted on the cross shaft 261 'and connected 25
in any suitable manner to rotate integrally with
meeting it at 28% to an ear 29| depending from a
carrier restore plate 292 fixed on the rock shaft
(Fig. 3). When the plate 85 (Fig. 6) begins
to rotate at the beginning of the forward stroke?,
the rack restoring cam 268. This mechanism,
the post 211 will push against the pivot of the
described in my aforesaid application, is operated
pawl 219 and rock the bail 282-286 in a clock
by the post 26% mounted on the side of the cam
wise direction as seen in Fig. 2 or in a counter?
plate HI, the post entering the cam surfaces 30 clockwise
direction as seen in Fig. 3, causing the
formed by the bifurcated legs of the rack restore
carrier
restore
comb 292 to swing downwardly
cam and positively restoring the various type
toward the uppermost teeth 38 of the adjoining
wheels and their associated racks to normal posi
accumulator sectors (Fig. 2). If any of these
tion as the bail rod 262 engages the bottom of the
accumulator
sectors have rotated one tooth be
curved slot 2'? in each type sector wheel during 35
yond the position shown in Fig. 2, that is whereby
the return stroke.
?
their ears 2'55 have entered a carrier pawl notch
As the racks are propelled forwardly to their
276 in tens transfer position, the carrier restoring
normal position by the bail rod 262, the lower
comb 292 will push them all back to normal, and
set of rack teeth 23 acting on the accumulator
the associated springs 26l will restore the carrier
sector teeth 35 will rotate each accumulator sec 40 pawls
to the position shown in Fig. 2. Hence,
tor towards its normal position, which is shown
this
machine,
as is equally true of the machine
in Fig. 2. But if any accumulator gear 5| shall
described in the above mentioned patent applica
have during the return stroke of the adding op
tion, does not require an idle stroke between an
eration rotated past its zero position, the sloping
adding operation and a total-taking operation.
side of the carrier cam projection 256 will have
lifted the associated carrier pawl and enabling
the latter to become locked in raised position.
The mechanism for locking is shown in Fig. 2
consisting of a locking pawl 272 rotatably mount
ed on shaft 233 and held under tension by spring ?
26 I. Should the carrier pawl be rotated to raised
position, the shoulder 273 on the carrier pawl
will?be rotated down far enough to permit the
lowermost edge v2M of the locking dog to override
the end of the pawl and thus hold the carrier
pawl in raised position even after the projection
on the carrier cam has passed. Referring to
Fig. 2, it will be observed that therefore as the
accumulator sectors 31 are being rotated counter
When a subtraction is being performed, the
accumulator gears 52 on the shaft 5?! are raised
into engagement with the accumulator sector
teeth 38, and the carrier pawls cooperate with
the carrier cam projections 256? in the same
manner as they do in the adding operation justv
described. If during subtraction, any accumu-�
lator on shaft 57 be rotated past its zero position,
the carrier pawl which will be thereby raised and;
locked will enable the accumulator to the left
thereof to rotate one tooth further, thereby sub
tracting ten from the adding accumulator in gear
therewith.
The third set of gears 53 on the shaft 56 are
provided for the purpose of operating the zero
clockwise to their normal positions, the laterally 60 eliminators which will now be described.
projecting ear 215 on any accumulator sector
plate will be able to enter the notch 2116 on the
carrier pawl to the right of the individual ac
cumulator sector if such pawl to the right has
been raised. Thus, after the rack and adding
sector have rotated the gear to the extent de
termined by the key setting in its own associated
bank, the spring 1&5 connecting the adding sector
and accumulator sector will rotate the gear one
Zero eliminators
To eliminate the printing of zeros to the left
of the ?rst ?gure which should be printed in any
total printed by the machine, that is where the
total is less than the full capacity of the machine,
zero eliminators as shown in Figs. 14 and 15 and
Fig. 2 are provided to cooperate with the third set
of accumulator gears on the shaft 58. Each of
these accumulators is provided with a cam 30!
having a notch 362 which will occupy the posi
tooth further if the carrier pawl to the right
thereof is held locked in raised position. Thus
the tens transfer is accomplished.
tion shown in Fig. 2 if the highest ?gure in the
As the accumulator carriage is dropped down
total does not extend into the bank with which
at the end of the return stroke, the cross bar
270 which extends between the accumulator frame 75 any such accumulator is associated. When the
total key is operated either to sub-total or total
15
position, the, rocking? of the, total control, lever,
generally indicated. as. 51712, in Fig, 1.9,.Wil1 cause
the. slot, lddto, push rearwardly against a pin; 383
mounted on, the sidcqf ahlever 353% (Fig. 5) piv
wardly into thelcamrecesses 3132 may dosoinas
stitutes the pivotal,connectionbetween the lever
3'38, (Fig. 3), fixed, on the rock shaft sea and the
rightand side plate 311 of the zero eliminator
integral over a shoulder 329 on the eliminator
much as theslots 325 and?SZl in the eliminators
no ?t; such movement under the action of the
individual springs 3 l 9
'
However, each eliminator is provided with a
oted on post, 305,
pivotally connected with a, 5
projection 328 which extends, as shown in Fig. 14,
post 3&5, extending through a slot 301 in the
to, the left from the eliminator with which it is
intermediate sideframe plate._ The, post 3135 con
next to the right thereof. Consequently, if? any
eliminator be held partially raised by the high
portion of its eliminator cam, every eliminator
to the right thereof will likewise be held up by
theeo-action between these projections 328 and
the shoulders 339. Hence for example, if the
frame. This plate has a slot 3I2 surrounding a
cross rod 3 i BwhiCh passes through allot the zero
eliminators andwhich is ?xed on the side frame
members 3}! and 3H! of the zero eliminator as
sembly, Accordingly, when the rotation of the 15 ?fth bank from the? right contains a sum which
should be printed in a total, its eliminator cam
total control-lever pushes the post 383 rearwardly,
will not be in zero position, its eliminator will be
causing the post Stifto be pulled downwar l , the
assembly frame-members 3H and 3M carry the
rod 313 downwardly and thereby carry along with
them each of the individual; eliminators such as
315, 3J5, 3H, and?ld, illustrated in Fig. 1%. That
held up-by the high portion of the cam, and every
eliminator to the right will likewise be held up,
20. and the type wheels to the right will print zeros
' or higher digits in ?accordance with the total then
existing in the machine. Restoration of the total,
is, the individual eliminators are pulled, down
lever to normal position will in an obvious man
ner restore the eliminators to their inoperative
wardly by their individual springs such as 31$,
which are connected to the plate 32! which ex
position, which is shown in Fig. 2.
A spacing comb 332, shown in Fig. 2, is provided
for spacing the accumulator sectors, and the comb
333 serves to space the ends of they carrier pawls
and, the lockingpawls. Another comb 334, shown
tends across the rear of the movable eliminator
frame serving as an anchor for the springs.
When the forward stroke begins and the accumu
lator carriage is lifted,? the lower ends of the
eliminato'rs' will contact the eliminator cams 393.
'
Combs 322 and? 323 are provided as shown to 30 in Fig. 2, spaces the type Wheels.
While one embodiment of the present invention
maintain the spaced alignment of the eliminators.
is herein illustrated� and described in considerable
Each eliminator carries on its upper forward
detail, it should begunderstood that the invention
portion a, roller, 32d, and?, when the eliminators
is.
capable off considerable modi?cation without
are inoperative, these rollers are positioned
slightly above the rear projecting portion 325 of 35 departing, from the spirit and scope of the inven
tion de?ned in the appended claim. .
each of therack bars. Consequently, in adding
Having shown and described my invention, I
operations the rack bars may slide underneath
the. rollers and betweenthe eliminators without
In? a calculating machine, a pair of parallel
interference. But in a total operation when the
claim:
?
'
,
?
'
eliminators are lowered, if any eliminator is not 40 shafts. one above the other, type wheels on the
upper shaft, accumulator driving gears on the
drawn into a zero recess 302 of its associated cam,
lower shaft, ?numeral key-controlled means re
the rear end 325, of, the associated rack will pass
ciprocating between said shafts for driving the
under and lift. slightly on the roller to prevent any
type wheels and said gears, sets of three pinion
further downward: movement of the, eliminator.
gears intermeshed on three adjacent shafts, one
To the left of the accumulator representing the 1
of each set being selectively engageable with the
highest denomination in the total there? may be
driving gears for addition, a second of each set
one or more accumulators in zero position, and
being engageable with the driving gears for sub
their associated eliminators will enter the recesses
traction, and means co-acting with the third of
302m their cams, and. the rollers carried by such
eliminators will drop down far enough to posi- , each, set of gears, in total-taking operations for .
preventing the printing of zeros to the left of the
highest order digit in the total, said pinion gears
being. arranged for reciprocation in the plane of
their axes and, in a_ direction perpendicular to
tively block anyrearwardmovement of these as
sociated racks. Hence, the associated type wheels
cannot rotate out of non-printing position even
though they havebeen released-bythe key board,
and they will thereforev not print zeros.
When
the eliminators havebeen lowered? by the total
control lever, any that are able to be pulled down
.
their axe-s.
THOMAS O. MEHAN.
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