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Патент USA US3090308

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May 21, 1963
c. A. CHRISTOFF ETAL
3,090,298
HIGH SPEED PRINTING SYSTEM
Filed Feb. 5, 1962
4 Sheets-Sheet 1
is
3
INVENTORS
BY
CHE/8 A. ewe/s 70,”
JOHN D. GEAE/(EAET
E/C‘HAED E. 50 CH
ATTORNEY
May 21, 1963
C. A. CHRISTOFF ETAL
3,090,298
HIGH SPEED PRINTING SYSTEM
Filed Feb. 5, 1962
4 Sheets-Sheet 2
I NVENTORS
(‘Me/5 ,4. CM€ISTOFF
JOHN L2 GEAEl-IEAET
BY
PEI-MED £1 BUSCH
May 21, 1963
c. A. CHRISTOFF ETAL
3,090,298
HIGH SPEED PRINTING SYSTEM
Filed Feb. 5, 1962
4 Sheets-Sheet 3
a
PIE_ Q;
INVENTORS
BY
(‘MG/J A. C/(E/STGFF
JOHN a GEAEl-(EAET
BIC/{4RD E. suscH
May 21; 1953
c. A. CHRISTOFF ETAL
3,090,298
HIGH SPEED PRINTING SYSTEM
Filed Feb. 5, 1962
COMPARISN
4 Sheets-Sheet 4
/03
I80
FIE
I NVENTORS
(‘HE/S ,4. are/s TOFF
JOHN a GEAR/164E?‘
BY
PIC/{142D E. BUS CH
42/44
United States nan o
ace
1
3,090,298
Patented May 21, 1963
2
mechanism for advancing the paper from one print line
to the next and is taken along the line 6—-6 of FIG. 3.
FIG. 7 is a schematic view illustrating the control cir
3,090,298
IHGH SPEED PRINTING SYSTEM
Chris A. Christotf, San Gabriel, John D. Gearheart,
cuitry for the printer.
Tempie City, and Richard E. Busch, La Puente, Cali?,
assignors to Clary Corporation, San Gabriel, Calif., a 5
The particular printer drum unit illustrated in connec
corporation of California
tion with the present invention is disclosed in detail in the
Filed Feb. 5, 1962, Ser. No. 170,930
above Witt et al. patent and therefore reference may be
9 Claims. (Cl. 101-933)
had to such patent for a complete disclosure of the unit.
It is to be understood, however, that the invention could
This invention relates to high speed printers or record
equally well be applied to any type of print-on-the-?y
ers of the so-called print-on-the-?y type wherein a printing
printer wherein a type drum is constantly moved past a
drum carrying type elements spaced around its periphery
printing point.
is continually moved past a recording device.
Such
drum may be rotated at a continuous speed as disclosed,
for example, in the Hartley Patent No. 2,776,618 issued
Referring to the drawings, the printer comprises a base
11 having three upstanding side walls 12, '13 and 114
on January 8, 1957 or it may be constantly moved in a 15 on or between which various units of the printer are
mounted.
non-uniform or hypocycloidal manner as disclosed and
claimed in the Witt et al. ‘Patent No. 2,915,968, issued on
December 8, 1959.
A hollow cylindrical printing drum 14 is mounted
through ball bearings i.e. 15 (FIG. 2) on eccentric shaft
portions 16 formed adjacent opposite ends of a rotatable
Printers of the above type are capable of relatively high
speeds. However, time must be allowed for advancement 20 drive shaft v17, the latter being suitably mounted for lo
of a record medium after each line of print has been com
‘cation in bearings (not shown) carried by bearing hous
ings >18 and 19 supported by the walls 12 and \13, respec
tively. A plurality of columns of type elements 20‘ are
the record medium to a new print line near the end of a
formed around the periphery of the drum. The type ele
current cycle as shown, for example, in the above Hantley
25 ments are arranged in 24- equally spaced rows of type
and Witt et al. patents.
elements, each row extending lengthwise of the drum
Accordingly, a blank space is usually left on the drum
and containing identical type. The type elements in each
between the last of one series of type elements and the
pleted. Generally, such printers provide for spacing of
beginning of the same or the beginning of a new series of
type elements to permit advancement of the record medi
column are arranged in two progressive series of 12 ele
ments each ranging in value from 0 to 9 with two addi
tional symbol type.
um as such blank spaces pass the printing point. In other 30
cases, relatively complicated electronic circuitry must be
provided to inhibit recording during the record medium
advancing phase of a printing cycle. Thus, in com
mencing a printing operation, printing is generally with
held until a de?nite starting position on the drum reaches
A stationary internal gear 21 is formed concentrically
of the shaft 17 proper in the bearing housing 18 and
meshes with an external gear 22 formed integrally with
the drum 14 and extending concentrically therewith.
The ratio between the number of teeth of gear 21 and
the printing point.
Although the printing drums of print-on~the-fly type
the number of teeth of 22 is such that as the drum orbits
about the axis A of the shaft ‘17 in one direction the drum
will advance in the opposite direction an amount equal
printers move at relatively high peripheral speeds, an ap
to the spacing between two adjacent rows of type ele
preciable time is wasted in inhibiting the printing operation
until the starting point on the drum has reached the print 40 ments during each revolution of the shaft 17.
ing point.
Accordingly, a principal object of the present inven
tion is to provide a printer of the above type wherein
Thus, during each revolution of the drive shaft, a new
row of type elements 20 will be moved to a printing
point or station formed by a row of type platens 24.
The platens .24 are slideable in guide slots formed in a
printing may commence any time during movement of 45
guide block 25 suitably ?xed to the base '11. Each of
the printing drum past the printing point.
the platens is pivoted at 26 to an armature 27 which, in
Another object is to provide a printer of the above type
turn, is pivotally supported at 28 to cooperate with a
in which no blank spaces need be provided on the print
ing drum to permit operation of the advancing mecha
respective electromagnet 30. Normally, each platen 24
is held in its lower position illustrated in FIG. 1, out of
nism for the record medium.
50 printing relation with the drum, by a tension spring 31
Another object is to provide a printer of the above type
extending between the respective armature and a station
which may be connected on-line with an electronic com—
ary stud 3.2. However, upon energization of the asso
puter or similar apparatus with a minimum of delay in
starting the printing operation.
ciated magnet 30, as will be described later, the platen
The manner in which the above and other objects of
the invention are accomplished with be readily under
stood on reference to the following speci?cation when read
will be raised su?iciently so that as the drum moves
in conjunction with the accompanying drawing, wherein:
. IG. 1 is a transverse sectional view through a printer
downward in a hypocycloidal motion, during its orbital
movement about the center of the drive shaft, it will effect
a printing contact with the platen so as to transmit a print
ing impression from a particular type element aligned
embodying a preferred form of the present invention and 60 with the platen onto a strip of paper 33. Suitable means
including an inking roller 29 are provided to apply a
is taken along the line 1—1 of FIG. 3.
?lm of ink to the surface of the type elements.
FIG. 2 is a sectional view through the printing drum
The paper strip is in fan-fold form and is provided
unit and is taken along the line 2—2 of 'FIG. 3.
with sprocket perforations '34 (FIG. 3) along its edges
FIG. 3 a sectional plan view of the printer and is taken
whereby it may be fed forwardly through the printer
along the line 3—3 of FIG. 1.
65 by a feed sprocket 35. The latter is rotatably mounted
FIG. 4 is a side elevation view illustrating the mecha
in bearings carried by the walls 12 and 13 and is effec
nism for transmitting motion to the different units of the
tive to draw the paper from a supply pack 36 and to
printer and is taken substantially along the line 4-4 of
FIG. 3.
advance the same between the printing drum '14 and the
row of platens 24, from one printing line position to
FIG. 5 is a sectional view illustrating the printer clutch 70 the
next.
and is taken along the line 5—5- of FIG. 3.
The printer is driven by an electric motor 38 which
FIG. 6 is a sectional view illustrating the ratchet feed
acts to constantly advance the drum 14 past the printing
3,090,298
station. For this purpose, a sprocket 40 (FIG. 4) on
the motor shaft drives a cog belt 41 which, in turn, drives
the intermediate unit of a compound sprocket 42 rotatably
mounted on a frame stud 43. The larger unit of the
sprocket drives a sprocket 44 fastened to the drive shaft
17 through a cog belt 45. The smaller unit of the sprocket
42 drives a sprocket 46 rotatably mounted on a shaft
49, concentric of the paper feeding sprocket 35, and a
second sprocket 47 through a cog belt 48. An idler
Wheel 50 maintains the belt 48 in intimate driving en 10
gagement with the sprockets 46- and 47.
The ratios of the diameters of the various cog belt
sprockets are such as to drive the shaft 17 twelve revo
4
Each denominational decade output of the computer
33 is provided with a set oil/four binary coded lines 183
which are connected as a second input set to the corre
sponding comparison gate 82. Although only three com
parison gates 82 and their connections to the output
trunk 81 and to respective output lines of the computer
$3‘ are shown, it will be understood that there will nor
mally be one comparison gate for each denominational
decade of the computer.
'
Although any suitable comparison gate circuitry capable
of comparing two sets of binary coded signals may be
employed which will produce a signal on an output line
85 when the input signals of each set coincide, reference
may be had to FIG. 5 of the copending London ap
lutions during each revolution of the sprocket 47 so
that the drum 14 will advance twelve rows of type ele 15 plication, Serial No. 802,778, ?led March 30, 1959, for
an illustration of an exemplary comparison gate circuit.
ments past the printing station during each revolution
The driven clutch disc 56 carries an electrical brush
of sprocket 47.
86 (FIGS. 5 and 7) which wipes over a second stationary
Means are provided to advance the paper strip 33 after
commutator 87 attached to the wall 114. The commuta
printing a line of characters, and for this purpose the
tor has 14 spaces equally spaced therearound, the ?rst 12
20
sprocket 46 is attached to a rachet wheel 52 (FIGS.
of which are occupied by contact segments 88 con
‘3 and 5) of a cyclic clutch generally indicated at 53.
nected together to apply successive timing pulses over
The rachet wheel has 14 equally spaced notches 152
a line 90 when the clutch is engaged. The 13th and 14th
therearound. A drive pawl 54 having a drive tooth 54a .
spaces contain a timing contact 91 connected through
is pivotally mounted at 55 on a driven clutch disc 56,
which disc is attached to the shaft 49. The shaft is 25 line 92 to one input of an “and” gate 93 and a “stop”
contact 94 connected through line 95 to the reset input
rotatably mounted in bearings carried by the feed sprocket
35 and the wall 114.
R of a trigger or ?ip-?op circuit 119.
It will be noted that the brush 86 is two pronged,
The pawl 54 is normally held out of engagement with
one prong of which wipes over the various contacts 88,
the rachet wheel against the action of a torsion spring
57, by a clutch dog 58 which is pivoted at 60 and nor 30 ‘E1 and 94 while the other prong wipes over a contact
ring 89 connected to a source of appropriate potential.
mally latches a camming disc 61 rotatably mounted on
Also, the brush 86 is normally located between the stop
the shaft 49 and provided with a camming surface under
contact 94 and the number one or ?rst timing contact
lying a stud 62 on the pawl.
'88 when the clutch is in full cycle position.
A cam 63v is suitably attached to the. shaft 49 and co
The ratios of the diameters of the various sprockets of
35
operates with a cam follower 64. The latter is fulcrumed
FIG. 4 are such that when the clutch 53 is engaged the
at 65 and is urged into engagement with the cam
brush 86 will advance from one contact ‘88 to the next
by a torsion spring 66. The cam follower is piv-otally
as the brush 75 advances from one contact 77 to the
connected through a ‘link 67 to a pawl 68 pivotally sup
ported by an arm 70 which is free on the shaft 49.
next.
However, since there are 14 equal spaces on the
A torsion spring ‘71 yieldably maintains the pawl 68 in 40 commutator 87, the printing drum and brush 75 will
driving engagement with a rachet wheel 72. fastened to
the paper feed sprocket 35.
The clutch dog 58 forms an armature which cooperates
with an electromagnet 73. Thus, upon energization of
the magnet, as will appear later, to release camming disc
61 and thus the pawl 54 to the action of its spring 57,
the clutch 53 will become engaged to complete a cycle
or 360°. It will be noted that the tip of the cam 63
normally, when the clutch is in full cycle position,
rests under the cam follower 64 so that at the corn
mencement of a clutch cycle the pawl 68 will rasp back
over a tooth of the rachet wheel 72, during which time
retrograde movement of the paper feeding sprocket 35
is prevented by a back up preventing pawl 74. During
actually advance 14 contact spaces or one and one sixth
revolutions during each cycle of the clutch.
From the foregoing it will be seen that when a type
element in a particular column of the printing drum pass
ing into proximity with the printing station corresponds
to a character represented by the output of the respec
tive decade of the register device 83, a signal will be
applied from the output of the associated comparison
gate 82 to one input of an “and” gate 97 whose output
is connected through a suitable amplifying circuit to the
platen positioning magnet 30, thereby conditioning the
“and” gate to transmit a print signal. Also, two or more
such gates 97 may be concurrently conditioned if two
or more similar characters are to be printed in the same
the latter stages of the clutch cycle, cam 63 will be
effective to drive the cam follower 64, and therefore pawl
68, to advance the paper feed sprocket from one printing
line position to the next.
print line.
source of appropriate potential. The contact segments
vid'ed.
The control circuitry for the printer will be described
in terms of logic wherein the term “true” signi?es one
form or level of potential and “false” signi?es another
form or level of potential.
As shown in FIGS. 3, 4 and 7, the sprocket 47 carries
Upon receipt of a steady state true signal from the
a two pronged electrical brush 75 which wipes over a
stationary commutator 76 suitably attached to thewall 60 computer 83 or other sourceover line 99, calling for a
print operation, the signal will be passed by an “or”
13. One prong of the brush wipes over twelve equally
gate 93 and will be inverted to a false signal by an in
spaced contact segments 77 which are insulated from
verter circuit 100. The latter signal will be applied over
each other, there being one contact segment for each
line 101 to one input of an “and” gate 132.
row of type elements on the drum. The other prong
Control trigger circuits or ?ipdlops 103 and 104 are pro
wipes over a contact or slip ring 79‘ connected to a 65
These are of the type which are set and reset
by separate true input signals and when in one such
77 are connected through respective lines 78 to the
condition or the other apply steady state output signals
inputs of a decimal-to-binary converter 80. The latter
on the corresponding outputs thereof. That is, when in
may be of any Well known design having. a four line
binary coded output trunk 81 which is connected to 70 “reset” condition, the left hand output thereof will pro
duce a true signal and the right hand output will pro
one set of. four inputs 181 of each of-a series of com
parison gates 82. The latter are associated with an
duce a false signal. When in “set” condition the output
electronic data registering device ‘83 which may be a
signals are reversed.
parallel output type electronic computer or the like
having a binary coded decimal output.
Normally, at the start of a print operation the ?ip-?ops
3,090,298
103 and 104, as Well as a third ?ip-?op 119, are in reset
conditions wherein their left hand or reset outputs are
applied over a line 115 from the computer 83 or other
source will effect engagement of the clutch to space the
true. Accordingly, a true signal will be applied from
paper while preventing printing. For this purpose, the
paper space signal is fed through the “or” gate 109‘, in
verters 110‘ and 111, “or” gate 98 and inverters 100 and
106 to the “and” gate 105 thus energizing the clutch con
the reset output of ?ip-?op 1103 to one input of an “and”
gate 105. Concurrently, the false print command sig
nal produced by inverter 100 will be inverted by inverter
106, and will be transmitted as a true signal to gate 105
where it will now be passed to energize the electromagnet
73 and thus cause engagement of the clutch 53.
trol magnet 73 in the same manner as noted above. How
ever, since the “and” gate 102 is held closed at this time
This
by application of a true signal thereto by inverter 111,
may obviously occur in any position of the type drum
the “and” gates 97 will not be enabled to- pass print sig
relative to the printing station but as the clutch pawl 54
nals to the magnets 30‘.
drops into the nearest notch 152 in the clutch disc 52, the
In order to permit manually controlled paper spacing
brush 86 will operate in synchronism 'with brush 75. At
at any time that the printer is not in operation, a push
this time, a true signal will be transmitted by the reset
button switch 116 is provided which is elfective upon
output of flip-?op 104 over line 120 and inverter 121 to 15
depression to transfer a true signal to one input ofan
the computer to prevent the computer from changing the
“and” gate 117. The other input of gate 117 is connected
data appearing on the output lines 1183 thereof. Also, at
to
line 101 which is normally held true by the inverter
this time, a false signal will be applied by ?ip-?op 119,
100 in the absence of a true print command signal from
over line 108, and through an “or” gate 109‘ and two in
the computer so that the ?ip-?op 119 will be set at this
verter circuits 110 and 111, located in tandem, to hold
time, thus transferring a true signal over line 108 to
a second input of the gate 102 false. The latter gate is
“or” gate 109 so as to effect a paper space operation in
effective only upon receiving false signals on all inputs
the same manner as previously noted in connection with
thereof to transmit a false signal which is inverted by in
the paper space signal from the computer while inhibiting
verter 180 and applied as a true signal to the second in
printing. Near the end of the clutch cycle, the brush 86
puts of all of the gates 97.
As the brush 86, in moving counterclockwise from its
full cycle position shown in FIG. 7, reaches the ?rst
25 will transmit a true signal over contact 94 and line 95 to
reset the ?ip-?op 119.
_
Although the invention has been described in detail
and certain speci?c terms and languages have been used,
contact 88 concurrently with passage of a row of type
elements into proximity with the printing station, a true
it is'to be understood that the present disclosure is illus
signal will be applied from contact ring 89, over brush 30 trative
rather than restrictive and that changes and modi—
86 and line 90 to set the flip-flop 103, applying a false
?cations may be made without departing from the spirit
signal to the gate 105 to deenergize the magnet '73. How
or scope of the invention as set forth in the claims ap
ever, the clutch will continue through its cycle.
pended hereto.
Also, an inverter circuit 112 acts to apply the signal as
Having thus described the invention, what is desired to
a false signal to the third input of the “and” gate 102.
be secured by United States Letters Patent is:
The latter Will now apply a false signal to the inverter
1. vIn a high speed recording system including a char
180 which transmits the same as a positive signal to the
acter
recording device movable into different recording
second inputs of all of the “and” gates $7. Thus, any
positions ‘for recording different respective characters at
conditioned gate or gates will pass a print signal to eifect
a recording stat-ion, means for constantly advancing said
printing of that type element or elements on the drum
40
representing characters registered by the corresponding
outputs of the electronic computer 83.
It should be noted that the time period during which
the brush 86 is in engagement with each contact 80‘ is
less than the time period during which the brush 75 is
in engagement with each contact 77, whereby the contacts
88 control the duration of time that the magnets 30‘ are
energized.
The brush 86 will successively apply control signals to
the gates 97 as the different rows of type elements pass into
proximity of the printing station to effect printing of
different characters registered by the computer. After
passage of a complete series of twelve such rows, i.e. a
recording device repetitively through said positions, and
normally disabled recording control means for effecting
recording by said recording device; the combination com
prising a comparison device having two inputs and an
output for transmitting a recording signal when two simi
lar signals are received by said inputs, means ‘for trans
mit-ting a signal representative of a character to be re
.corded by said recording device to one of said inputs,
means operable synchronously with ‘said recording device
for transmitting a signal to the other of said inputs repre
sentative of the recording character instantly in proximity
to said recording station, a cyclically operable timing
device having a number of timing positions equal to the
number of said different recording positions, normally
complete revolution of the printing drum regardless of
the starting point or row, the brush 86 will engage a con 55 disabled means for advancing said timing device through
said timing positions in synchronism with movement of
tact 91, applying a true reset signal over line 92 to the
said character recording device through said recording
“and” gate 93. At this time a true signal will have been
positions, means controlled jointly by said timing device
applied to a second input of the gate 93 by the set ?ip
when moving through said timing positions and by a said
?op 103. Since the ?ip-?op 119 is normally in reset con
recording
signal for enabling said recording control
dition, the third input of gate 93 will be set true, permit
means, and means for enabling said timing device advanc
ing means at any time during advancement of said record
ting gate £6 to pass a true signal to set ?ip-?op 104. Ac
cordingly, a signal will be applied over line 120' and in
verter 121 to enable the computer to apply a new set of
ing device.
?ip?ops 103 and 104.
a recording station, means for constantly advancing said
2. In a high speed recording system including a char
data to its output lines 183 and to change the steady state
print command signal over line 99' to false. The inverter 65 acter recording device movable into different recording
positions for recording different respective characters at
100 will now apply a true signal over line 101 to reset
‘
recording device repetitively through said positions, and
As brush 86 engages stop contact 94, a true signal will
normally disabled recording control means for e?fecting
be applied over line 95 to reset ?ip-?op 119 in the event
recording by said recording device; the combination com
it has been set as will be described presently.
70 prising a comparison device having two inputs and an
It will be noted that the actual paper advance ctfected
output for transmitting a recording signal when two simi
by cam 63 (FIG. 6) occurs during passage of the brush
lar signals are received by said inputs, means for trans
36 beyond the last contact 88a, i.e. after the drum 14- has
mitting a signal representative of a character to be re
made one complete revolution.
Means are provided whereby a true paper space signal 75 corded by said recording device to one of said inputs,
means operable synchronously with said recording device
3,090,298
7
for transmitting a signal to the other of said inputs repre
sentative of the recording character instantly in proximity
ing means to advance said record medium.
5. In a high speed recording system including a print
ing drum having a plurality of type elements therearound,
a normally disabled printing device for e?ecting a printing
impression from said drum, means for advancing a record
medium between said drum and said printing device, and
means for constantly advancing said drum whereby to
successively advance different ones of said type elements
rt-o said recording station, a timing device having a num
ber of timing positions equal to the number of said
different recording positions, means including a normally
disengaged cyclically operable clutch for advancing said
timing device through said timing positions in synchro
nism with movement of said character recording device
through said recording positions, means controlled jointly
by said timing device when moving through said timing
8
timing’ positions for causing said record medium advanc
10
positions and by a said recording signal for enabling said
recording control means, and means for engaging said
clutch at any time during advancement of said recording
device.
3. In a high speed recording system including a char
acter recording device movable into different recording
positions for recording different respective characters at
a recording station, means for constantly advancing said
recording device repetitively through said positions, nor
mally disabled recording control means for effecting re
cording by said recording device, and means for advanc
ing a record medium past said recording device; the
combination comprising a comparison device having two
inputs and an output ‘for transmitting a recording signal
when two similar signals are received by said inputs,
means for transmitting a signal representative of a char
acter to be recorded by said recording device to one of
said inputs, means operable synchronously with said
past said printing device; the combination comprising
means for transmitting a coded signal representative
of a character to be printed, means operable synchro
nously with said drum for transmitting a coded signal
representative of the type element instantly in proximity
to said printing device, means responsive to said last
two mentioned means upon transmission of signals repre
sentative of a type element and a ‘corresponding charac
ter to be printed for conditioning said painting device to
effect a printing impression, a timing device having a
number of timing positions equal to the number of type
elements around said drum, means including a normally
disengaged cyclically operable clutch for advancing said
timing device through said timing positions synchronous
ly with said drum; means controlled by said timing device
when moving through said timing positions to enable said
printing device only if said printing device is conditioned,
means for engaging said clutch at any time during ad
vancement of said drum, and means controlled ‘by said
clutch after advancing said timing device through all of
said timing positions for causing said record medium
of said inputs representative of the recording character 30 advancing means :to advance said record medium.
instantly in proximity to said recording station, a cycli
6. In a high speed recording system including acharacter
cally operable timing device having a number of timing
recording device movable into different recording posi
positions equal to the number of said different recording
tions for recording different respective characters at a
positions, normally disabled means for advancing said
35 recording station, means for constantly advancing said
recording device for transmitting a signal to the other
timing device through said timing positions in synchro
nism with movement of said character recording device
through said recording positions, means controlled jointly
by said timing device when moving through said timing
positions and by said recording signal for enabling said
recording control means, means for enabling said timing
device advancing means at any time during advancement
of said recording device, and means controlled by said
timing device after advancement of said timing device
recording device repetitively through said positions, and
normally disabled recording control means for effecting
recording by said recording device, the combination com
prising a comparison circuit having two inputs and an
output for transmitting a recording signal when two
similar signals are received by said inputs, means for
transmitting a signal representative of a character to be
recorded by said recording device to one of said inputs,
means operable synchronously with said recording device
for transmitting an identifying signal of predetermined
record medium advancing means to advance said record 45 time period to the other of said inputs representative of
medium.
the .type element instantly at said recording station, a
4. In a high speed recording system including a char
timing device having a number of timing positions equal
through all of said timing positions for causing said
' acter recording device movable into different recording
positions for recording different respective characters at
a recording station, means for constantly advancing said
recordingdevice repetitively through said positions, nor
to the number of said different recording positions, means
including a cyclically operable clutch for advancing said
timing device through said timing positions synchro
nously with said recording device, and means controlled
jointly by said timing device when moving through said
cording by said recording device, and means for advanc
timing positions and by a said recording signal for trans
ing a record medium past said recording device; the
mitting an enabling signal of a shorter duration than
combination comprising a comparison device having two 55 that of each of said identifying signals to enable said
inputs and an output for transmitting a recording signal
recording control means.
when two similar signals are received by said inputs,
7. In a high speed recording system including a print
means for transmitting a signal representative of a char
ing drum having a plurality of type elements therearound,
acter to be recorded by said recording device to one of
a normally disabled printing device for re?ecting a printing
said inputs, means operable synchronously with said re
impression from said drum, means for advancing a record
cording device for transmitting a signal to the other said
medium between said drum and said printing device, and
mally disabled recording control means for e?ecting re
inputs representative of the recording character instantly
means for constantly advancing said drum whereby to
in proximity to said recording station, a timing device
successively ‘advance diiierent ones of said type elements
having a number of timing ‘positions equal to the number
65 past said printing device; the combination comprising
of said diiierent recording positions, means including a
means vi01- transmitting -a coded signal representative of a
normally disengaged cyclically operable clutch for ad
character to be printed, means operable synchronously
with said drum for transmitting a coded signal repre
vancing said timing device through said timing positions
sentative ‘of the type element instantly in proximity to
synchronously with said recording device, means con
trolled jointly by said timing device When moving through 70 said printing device, means responsive to said last two
mentioned means upon transmission of signals repre
said timing positions and by said recording signal for
sentative of a type element and a corresponding character
enabling said recording control means, means for engag
to be printed for conditioning said printing device to effect
ing said clutch at any time during the advancement of
a printing impression, a timing device having a number
said recording device, and means controlled by said clutch
of timing positions equal to the number of type elements
after advancing said timing device through all of said’
9
10
around said drum, normally disabled means for advancing
said timing device through said timing positions in syna
9. In a high speed printing system including a type
drum having ‘a plurtlity of columns of type elements
therearound, means for constantly moving said type drum
to successively advance said type elements through ‘a
printing station, ‘a plurality of normally disabled printing
chronism With movement of said type elements past said
printing device, means controlled by said ‘timing device
when moving through said timing positions to enable said
printing device only if said printing device is conditioned,
means for enabling said timing device advancing means
control devices, each associated with a different column
of type and each effective to transfer an impression of a
selected type element onto a record medium at said print
at any time during advancement of said drum, and means
controlled by said timing device after advancement of
said timing device through all of said timing positions for
causing said record medium advancing means to advance
said record medium.
ing station, and means for advancing said record medium
relative
to said printing station; the combination com
10
prising a plurality of comparison devices, each having
a ?rst input and a second input and an output for trans
mitting an output signal when two similar signals are
received by the ?rst and second inputs of a respective
8. In a high speed printing system including a type
drum having a plurality of columns of type elements
therearound, means for constantly moving said type
drum to successively advance said ‘type elements through 15 comparison device, means for transmitting signals repre
sentative of characters to be printed by said printing
a printing station, and a plurality of normally disabled
control
devices to respective ones of said ?rst inputs,
printing control devices, each associated with a dilierent
means operable synchronously with said type drum, for
column of type and each eifective to transmit an im
transmitting a signal to all said second inputs representa
ression of a selected type element onto a record medium
tive
of the type element instantly in proximity to said
at said printing station; the combination comprising a 20
printing station, a timing device having :a number of tim
plurality of comparison devices each having a ?rst input
ing positions equal to the number of said type characters
‘and a second input and an output for transmitting an
around
each of said columns, means including a cyclically
output signal when two similar signals are received by
operable clutch for ‘advancing said timing device through
the ?rst ‘and second inputs of a respective comparison
timing positions synchronously with said type drum,
device, means for transmitting signals representative of 25 said
and
for
thereafter actuating said record medium advancing
characters to be printed by said printing control devices
means, means controlled jointly by said timing device
to respective ones of said ?rst inputs, means operable
When ‘moving through said timing positions and by a said
synchronously with said type drum for transmitting ‘a
output signal ‘for enabling each of said printing control de
signal to ‘all said second inputs representative of the type
vices,
and means ‘for selectively engaging said clutch at any
element instantly in proximity to said printing station, 30 of different
times during movement of said drum.
a timing device having a number of timing positions equal
to the number of said type elements around each of said
References Cited in the ?le of this patent
columns, means including a cyclically operable clutch
UNITED STATES PATENTS
for ‘advancing said timing device through said timing
positions synchronously With said type drum, means con 35
trolled jointly by said timing device when moving through
said timing positions and by a said output signal for
enabling each of said printing control devices, and means
for selectively engaging said clutch at any of di?erent
40
times during movement of said drum.
2,776,618
2,915,966
2,915,967
2,915,968
2,941,188
2,954,731
Hantley _______________ __ Jan. 8,
Jacoby _______________ __ Dec. 8,
Gehiing ______________ __ Dec. 8,
Witt et al ______________ __ Dec. 8,
Flechtner ____________ __ June 14,
Durand et a1 ___________ __ Oct. 4,
1957
1959
1959
1959
1960
1960
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