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Патент USA US2134223

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Oct. 25, 1938.
w. G. BRILL,
NUMERICAL PRINTING DEVICE
' Filed Dec, 50, 1936
.giv
2,134,223
2,134,223
Patented Oct. 25, 1938
UNITED STATES PATENT OFFICE
2,134,223
NUMERICAL PRINTING DEVICE
Willem Gerhard Brill, Johannesburg, Transvaal,
Union of South Africa
Application December 30, 1936, Serial No. 118,355
In Great Britain June 22, 1936
(Cl. 101—-88)
corresponding adjacent wheel through one step
This invention relates to numerical printing de
vices, of the kind having a series of rotatable movement.
The radially-slidable member is movable pref
numbering wheels, representing units, tens, hun
8 Claims.
dreds and so on.
At present, in devices of this kind, the several
numbering wheels are rotated with a step-by-step
motion (in the necessary order, and at the proper
relative speeds, for consecutive numbering) by
erably by cam means, which, as the numbering
wheel concerned is rotated so as to bring the
numeral “9” or “0” (whichever is borne by the
said member) into printing position, causes the
member to slide upwards to “type level” and the
tooth thereon to abut against the uppermost of
individual pawls acting on ratchet teeth on the
1 O Wheels. The pawls are customarily mounted on
a common carrier oscillated (in synchronism
the ?xed teeth adjacent, and which, as soon as
with the successive operations of printing) by a
spring-plunger acted on by the platen or equiv
alent of the printing machine.
corresponding adjacent numbering wheel, in the
These known devices are open to a serious ob
jection in that, at times, the pawls do not ad
vance the numbering wheels the exact distance
required. As a result, the numbers are printed
incorrectly, and a whole sequence of printed
20 sheets or the like may be spoiled.
The object of the present invention is to pro
vide numerical printing devices which will be
more reliable than heretofore, even at high
printing speeds.
According to the invention, I provide numeri
cal printing devices of the kind stated in which
the step-by-step motion of the tens, hundreds,
and other multiple-unit wheels is effected by
inter~engageable teeth or other coupling ele
30 ments thereon, and in which each said wheel
through the said teeth or elements—~is connect
ible, at, and for, such time as is necessary for
its successive step-movements, to the lower mul
tiple (or, in the case of the tens wheel. to the
35 units) wheel adjacent, such units wheel being
25
directly
rotated-through
pawl-and-ratchet
means or otherwise-by, and in synchronism
with, the platen or equivalent of the printing
machine.
40
More speci?cally, the invention comprises nu
merical printing devices of the kind stated in
which each numbering wheel has one of its
numerals (“9” for forward-numbering, and “0”
for backward-numbering devices) formed or car
ried on a member which is slidable radially in
the wheel and has a tooth projecting axially
thereof, and in which the tens, hundreds, and
other multiplewunit wheels have each a series of
?xed teeth projecting towards the radiallyeslid
50 able tooth adjacent, the units wheel being ro
tated step-by-step through means operated di
rectly from the platen. or equivalent, and each
radially-slidable member being moved so as to
engage the tooth thereon with one of the ?xed
55 teeth adjacent, for the purpose of rotating the
the next step-movement of the said numbering
wheel is completed, causes the member to be re
tracted, so as to disengage the said teeth, the
course of such movement, having been drawn
round one step.
.
The invention, as applied to a numerical print
ing device of the “backward-numbering” type,
will now be described by way of example, with
reference to the annexed drawing, in which:
Fig. 1 is a View of the device in longitudinal
section, its pawl mechanism being removed;
Fig. 2 is an end-sectional view taken on the line
H-ll (Fig. 1) looking in the direction of the
arrows;
Fig. 3 is a plan view of the device;
Fig. 4 is an end View of the pawl and ratchet
mechanism (looking away from the plunger of
the device) ;
Fig. 5 is a view of the tens numbering wheel,
with its ?xed teeth and a detent device;
Fig. 6 is a view of the units wheel, looking
towards its radially-slidable member and cam;
Fig. 7 is a diagrammatic view of the fixed teeth
of the tens numbering wheel and the path of the
slidable tooth on the units wheel.
Referring to the drawing:
The device has a frame I, in which a ?xed
hollow shaft 2 and a rotatable inner shaft 3 are
mounted. At the left-hand end (Fig. 1) of the
shaft 3, a crank 4 is formed. With the ba1l~shaped
end 5 of this crank, there engages a slotted de
pendent lug 6 on a plunger ‘l. Guides 3 on the
latter are slidable in vertical holes 9 in the frame,
and a strong spring "I forces the plunger normally to its upper position, as illustrated. This
30
3'5
40
4'0
spring is housed in a cup-shaped recess l l in the
frame I and its upper end is centralized against
he plunger by a ball-mounted spring-pressed
cap I2.
50
The shaft 3, at its right-hand end (Fig. 1), is
formed with a squared portion l3.
On this, a
carrier M- (Fig. 4) provided with spring-pressed
pawls i5 is secured. These latter engage with a
ratchet wheel l6, backward rotation of which is 55
2
2,134,223
prevented at all times by a spring-pressed catch
I‘I.
On the hollow shaft 2, the numbering wheels
I8, I9, 20, 2| and 22 are rotatably mounted.
These each carry type-numerals “0 to 9” ar
ranged equidistantly round their circumferences
(Fig. 3). The respective wheels mentioned de
note units, tens, hundreds, thousands and tens
of thousands. As will also be seen from Fig. 3,
10 the top of the plunger ‘I is formed with type-let
ters “No”.
Each numbering wheel I8 to 22 is provided with
a cam disc 23 ?xed on the hollow shaft 2. On
the face of this disc, a cam slot 24 is formed.
15 The type-numeral “0” of each numbering wheel
is carried on a radially-slidable member 25, and
a pin 25 thereon engages with the cam slot 24.
On the side of the member 25, a tooth 21 is pro
vided (see also Fig. 6); in the case of the num
20 bering wheel 22, such tooth is omitted. A series
of teeth 28 is ?xed equiangularly round the face
of each numbering wheel I9 to 22 directly oppo
site the respective tooth 21, the disposition of
such teeth 28 corresponding to that of the type
25 numerals aforesaid.
Each numbering wheel l9 to 22 is formed with
a decagonal rim 29. Against this, a detent-device
38 (Fig. 5) is pressed by a strong spring 3i. The
strength of the spring is suiiicient to draw the
angle of the wheel rim 29 into the V-shaped
groove 32, should the wheel have over-reached or
stopped short of its precise step~movement.
The modus operandi of the device is as fol
lows:—
35
The frame I is mounted in the usual manner
on the type-bed (not shown). As a result, the
plunger '1 is depressed at each printing operation
by the platen or equivalent of the printing ma
chine. By this means, the crank 4 is caused to
rock the shaft.3, and the carrier I4 thereon
draws back the pawls I5 over the ratchet wheel
!6. The extent of backward movement is sub
stantially equivalent to one ratchet tooth, there
being ten such teeth in all. As will be apparent,
45 the catch I7 keeps the wheel I6 stationary dur
ing this operation.
When the platen or equivalent recedes, and the
plunger ‘I rises under the action of spring ID, the
crank 4 and carrier I4 cause the pawls [5 to
force the ratchet wheel I 6 round the distance
or" one tooth, i. e., feth of a revolution. _In this
position, the wheel I 6 is held by the catch I 7.
Since the ratchet wheel I6 is ?xed to the units
numbering wheel I8 (see key 33 in Fig. 1), the
latter is also stepped forward 1‘—oth of a revolu
tion. This motion takes place each time the
plunger 1 is depressed and released.
In practice, movement requires to be transmit
ted to the tens wheel I 9 only when the units wheel
60 i 8 has printed in succession the type-numerals
“9 to 0”. Such transmission is effected as fol
lows:——
With the type-numeral “l” uppermost (Fig.
7), the tooth 2'! in wheel I8 will be at the po'
sition 21a. On the next step-movement of the
units wheel l8, the tooth 21 (under the con
straint exercised on the radially-slidable member
25 by the cam slot 24) is raised into abutment
against the tooth 28 which is uppermost on the
tens Wheel I9. In this position, the type-numeral
“0” on the units wheel is uppermost, and after
printing, it is moved T‘Eth of a revolution to the
left (Fig. 6). In the course of such movement,
the tooth 2'I—through engagement with tooth 28
75 afcresaid—carries the tens Wheel I9 round Ihth of
a revolution likewise. At the conclusion of this
movement, the tooth 21 (under the constraint of
the cam slot 24 on the member 25 of the units
wheel) will be just free from the tooth 28 (see
21b, Fig. '7). As a consequence, on the next step
movement of the units wheel I8, the tens wheel
I8 will be left undisturbed.
The same transmission action will take place
between the units and tens wheels l8, l9 when
the former has printed a further sequence of 10
type numerals “9 to 0”. Likewise, when the tens
Wheel I9 has printed its full sequence of numerals,
the type numeral “0” of such wheel (under the
constraint of the corresponding cam slot 24) will
have been raised, and the relative tooth 21 will
be in engagement with the uppermost tooth 28 of
the hundreds wheel 20 and—at the next opera
tion of the tens wheels—will carry such wheel 28 '
round one step. As will be appreciated, the trans
mission to the remaining wheels 2| and 22 is 20
effected similarly.
Since, in many cases, it is not desired to print
with all ?ve numbering wheels I8 to 22 (e. g.,
when numbering only one thousand pages), it is
customary in numerical printing devices to make
the type numeral “0” of each wheel manually de
pressible below type level. In my invention, for
this purpose, a notch 34 is provided in each cam
slot 24, the pin 26 being depressible into this
notch by simply moving the type-numeral “0"
slightly beyond its uppermost position and thrust
ing the radially-slidable member 25 inwards.
When the numbering wheels are in normal opera
tion, there is no tendency, it is found, for the pin
28 to drop into the notch 34 accidentally, the
tooth 21 on the member 25 being in frictional
engagement at that point with the driven tooth
28.
It will be apparent that, since the plunger
spring ID, in the case of four or ?ve ?gure num
40
bers, must supply the power to pull over from
time to time a corresponding number of wheels,
it should be made particularly strong, and that
the strength of the detent springs 3| should be
high likewise, though not, of course, so high as
that of the spring I0.
45
Since only a single ratchet wheel I6 is neces
sary, duplicate pawls I5 can, as illustrated, be
conveniently used, for reliability. Moreover, since
the periodic coupling of the numbering wheels to
one another depends solely on positively operated
means, there is little or no danger of failure to
rotate each wheel as and whenever required, even
at high printing speeds.
I claim:
1. For a printing machine, a numerical print
ing device comprising a series of rotatable num
bering wheels representing units, tens, hundreds
and so on; a member radially slidable on each
numbering wheel and having thereon one of the 60
terminal numbers of the series on said Wheel; a
tooth projecting from each member axially of
said wheel; a series of ?xed teeth projecting
from each of said wheels and arranged for en
gagement by the tooth on the radially slidable
member of an adjacent wheel; means for impart
ing step by step rotation to said units wheel;
and means operative to actuate each slidable
member radially of its wheel so that the tooth
on such member is caused to engage one of the 70
teeth on an adjacent wheel and rotate the latter.
2. For a printing machine, a numerical print
ing device comprising a series of rotatable num
bering wheels representing unit, ten, hundreds
and so on; a member radially slidable on each
3
2,184,223
numbering wheel and having thereon one of the
terminal numbers of the series on said wheel; a
tooth projecting from each member axially of
said wheel; a series of ?xed teeth projecting from
each of said wheels and arranged for engagement
} by the tooth on the radially slidable member of
an adjacent wheel; means for imparting step by
step rotation of said units wheel; and cam means
operative to cause said slidable member to move
radially to type level and engage its tooth with
one of the ?xed teeth on the adjacent number
ing wheel as each numbering wheel is rotated to
bring the terminal numeral of its series into
printing position, said cam means being con
structed and arranged so that when the succeed
ing one step movement of the numbering is com
pleted the radially slidable member will be re
tracted and its tooth disengaged from the tooth
on said adjacent numbering wheel which will
have been rotated through a one step movement
during such succeeding step movement of the
numbering wheel carrying said member.
3. For a printing machine, a numerical print
ing device comprising a series of rotatable num
; bering wheels representing units, tens, hundreds
and so on; a radially slidable member carried by
said numbering wheels and having thereon one
of the terminal numerals of the series of numer
als on said wheel; a tooth projecting from each
30 radially slidable member axially of its number
ing wheel; a series of ?xed teeth projecting'from
each numbering wheel; means for imparting step
by step rotation to the ?rst numbering wheel of
said series; and cam means operative to cause
the slidable member carried by such wheels to
move radially into type level position and en
gage its tooth with one of the teeth on the ad
jacent numbering wheel to rotate the latter as
each numbering wheel is rotated to bring one of
40 the terminal numerals of the series thereon into
printing position, said cam means being con
structed and arranged so that said radially slid
able member is retracted below type level when
slightly offset from printing position and rota
45 tion of the adjacent wheel limited to one step.
4. A numerical printing device as claimed in
claim 1 comprising decagonal rims on the tens
and other multiple unit wheels and spring detent
devices having grooved members adapted to en
50 gage with the angles of said rims.
5. A numerical printing device as claimed in
claim 3 wherein the cam means comprises
notched means constructed and arranged so
that the radially slidable member is depressible
below type level when slightly offset from its
printing position.
6. For a printing machine, a numerical print
ing device comprising a series of rotatable num
bering wheels; a member radially slidable on
each numbering wheel; a tooth projecting from 10
each member axially of said wheel; a series of
?xed teeth projecting from each of said wheels
and arranged for engagement by the tooth on
the radially slidable member of an adjacent
wheel; means for imparting step by step rotation 15
to one of said wheels; and means operative to
actuate each slidable member radially of its
wheel so that the tooth on such member is
caused to engage one of the teeth on an adjacent
20
wheel and rotate the latter.
7. For a printing machine, a numerical print
ing device comprising a series of rotatable numbering wheels; a member radially slidable on each
numbering wheel; a tooth projecting from each
member axially of said wheel; a series of ?xed 25
teeth projecting from each of said wheels and
arranged for engagement by the tooth on the ra
dially slidable member of an adjacent wheel;
means for imparting step by step rotation to
one of said wheels; and cam means operative to 30
actuate each slidable member radially of its
wheel so that the tooth on such member is
caused to engage one of the teeth on an adja
cent wheel and rotate the latter, said cam means
being constructed and arranged so that when the 35
succeeding one step movement of the numbering
is completed the radially slidable member will be
retracted and its tooth disengaged from the tooth
on said adjacent numbering wheel which will
have been rotated through a one step movement
40
during such succeeding step movement of the‘
numbering wheel carrying said member.
8. A numerical printing device as claimed in
claim 6 wherein decagonal rims are provided on 45
certain of said wheels together with spring
detent devices having members adapted to en
gage with the angles of said rims.
WILLEM GERHARD BRILL.
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