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Патент USA US2134097

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Oct. 25,_1938.
H_ A. AVERY ET AL
’
2,134,097
TYPEWRITING MACHINE
Filed Jan. 29. 1938
WWW
XNVENTORS
#14. lrer 7‘
‘1f. ?arzéd/
W
ATTORNEYS
'
Patented Oct. 25, 1938
2,134,097
UNlTED s'rArss
PATENT orFIcéE“ ‘
2,134,097
TYPEWRITING MACHINE
Henry Allen Avery and‘ Joseph P. Barkdoll,
Groton, N.-Y., assignors to L. C. Smith a
Corona Typewriters, Inc., Syracuse, N. Y., a cor-
_
'
poration of New York
Application January .29, 1938, Serial No. 187,611
16. Claims. (01. 197—138)
The invention relates to improvements in type
pivot elements l9 and 20 for swinging of the bail
writing ‘machines and more particularly to paper
holding bail mechanisms or devices for retaining
work pieces in proper relation with the platen for
into and out of contact with the platen about a
receiving impressions from the types.
The invention has for its principal object to
provide an improved paper bail mechanism or de
vice affording ef?cient control of the paper for
typing, introduction of the paper into the ma
ill chine, and for making erasures.
To the foregoing vand other ends which .will
appear hereinafter, the invention consists in the
combinations of elements and devices, arrange
ments of parts, and features of construction de
scribed hereinafter and particularly pointed out
in the appended claims.
In the drawing:
Fig. 1 is a fragmentary side elevation, with cer
tain parts broken away, showing the invention
embodied in its preferred form and incorporated
in a known typewriting machine of the semi-front
strike or three-quarter strike variety, the bail
being shown in its “on” or working position;
Figs. 2 and 3 are views similar to Fig. 1, but
showing the paper bail in two di?erent “o?” po
sitions;
.
Fig. 4 is a front view of the bail mechanism with
the parts positioned as in Fig. 1;
Fig. 5- is a sectional view on the line 5—5 of
Fig. 4; and
Fig. 6 is a view similar to Fig. 5 showing the
illustrated parts differently positioned as more
fully hereinafter explained.
horizontal ‘axis extending transversely of the ma
chine. The saidaxis is located below and for
ward of the printing line of the machine, and the "
paper feed rolls of the bail contact the platen
above and to the rear of the printing line in the
“on” position of the bail. A bail return spring 2i
is anchored to the carriage and to side arm l5 of .
the bail to constantly tend to pull the bail into 10
“on” position and to yieldingly hold the bail in
that position, the “on” or paper-clamping posi-‘
tion of the bail being shown in Figs. 1 and 5. ‘
Provisions are made (1) for a maximum cast
off position of the bail in which rod 14 andthe E15
feed rolls ll thereon are located a considerable
distance from the platen forward of the-vertical
plane of the printing line to permit ready access
to typed matter at the printing line for making
erasures, in which maximum cast-off position the 20'
bail is not latched against return movement but
must be held by the typist and from which the
bail is free to return to “on” position upon release
of the hold of the typist on the bail, and (2) for
an intermediate cast off and latchedoff position 25
of the bail in which the rod [4 and rolls I‘! are
closely adjacent the platen but spaced therefrom
to permit ready introduction and adjustment'of
paper sheets into the machine by‘ the typist‘. The
intermediate cast off and latched off position of 30
the bail is shown in Fig. 2, and the maximum‘ cast
off position of the ball is shown in Fig. 3. '
I
The bail is latchable in the intermediate‘ o?
position shown in Fig. 2 through the medium of a
Referring to the drawing in which the invention
is shown incorporated in a known Corona type
writing machine, ' l0 designates the traveling
pivoted latch lever or arm 22 mounted on the 35
platen carriage having end plates Ita and lilb,
side arm l5 of the paper bail.
I I the rotary platen mounted in the carriage, and
I2 the carriage bed upon which the carriage
40 travels. In addition to these parts, the known
machine also includes type bars which strike
upon the upper front portion or quadrant of the
platen, one of said type bars being shown in the
drawing and designated IS. ‘The improvements
45 will now be described.
The paper bail comprises a metal rod or shaft
H, a pair of sheet metal side arms l5 and I6
connected at their upper ends by said rod. and
carriage and of a stud or pin 23 ?xedly held to
'
Stud 23 projects outwardly from bail arm l5
above bail pivot I 9 through a suitable arcuate
clearance slot 24 in carriage end plate Illa.’ Latch 40
lever 22 is located at the outer face of end plate
Mia, and said lever is pivotally held at its rear end
to said end plate by a suitable pivot element 25 to
rock up and down. The latch lever extends for
wardly and upwardly from its pivot over the shaft 45
of platen H and is normally but yieldingly held
drawn down into the position shown in Fig. 5 by
means of a pull spring 26 anchored to said lever
the usual pair of rubber-faced paper feed rolls ll and to end plate Ilia. An upwardly extending
50 rotatively mounted on rod M. The bail also has stem 2'5, formed integrally with the latch lever 50
a suitable hand knob or v?nger piece l8 ?xed and extending upward from the upper edge of
thereto at its right hand end opposite rod l4 and said lever adjacent the forward end of the lever,
at the outer face of bail side arm It‘. The side is formed at its upper end with an outwardly
arms of the bail are pivotally mounted at their projecting ?nger-piece or key 28 and an inward
lower ends on the carriage end plates by means of ly projecting stop lug 29. Stop lug 29 normally‘
2
2,184,097
rests on the upper edge of end plate illa of the
carriage. Depending from the lower edge of lever
22, forward of the platen shaft and adjacent the
free forward end of lever 22, is a latching nose
30 integral with the lever and having downward
ly converging forwardly and rearwardly facing
cam edges.
In the normal lowered position of the latch
lever the nose 3|] overlaps slot 24 in end plate
10 IllEL and is in the path of movement of stud 23
said latched off position or the "on” position of
the bail, there is formed on one edge of slot 32
of the link 3| (that edge which normally tends
to gravitate into contact with stud 34 when the
bail is pulled forward) a cam hump or projec
tion 35 rounded or shaped for riding thereof in
both directions over stud 34 and located adja
cent the end of the slot which is nearest the
link pivot 33, and there is formed on the oppo
site edge of said slot 32 and slightly farther from 10
on bail arm l5. In the “on” or paper clamping said link pivot than cam 35 a bail-stopping pro
position of the bail shown in Figs. 1, 4 and 5, jection 36, projection 36 having an abrupt bail
the stud 23 is behind or in rear of latch nose 30, stopping edge facing toward the link pivot and
converging at the top of the projection with an
as shown in Fig. 5. In the latched off interme
oppositely facing cam edge of said projection 15
15 diate “off” position of the bail, shown in Fig. 2,
the stud 23 is engaged against the forward cam' facing generally toward the opposite end of link
edge of the latch nose 30 and the latch holds
the bail against return to “on” position by reason
of the engagement between said nose 30 and
stud 23.
The cam edges of the nose permit camming
or lifting of latch 22 by study23 to permit said
stud to pass said nose when the bail is ‘pulled
forward by the typist from the “on” position of
the bail, and also when said bail is pushed rear
ward by the typist from the intermediate and
latched "off” position of the bail shown in Fig. 2,
but when the bail is merely pulled forward from
the ‘.‘on” position far enough for the nose to drop
behind the stud (or slightly farther, as shown
in Fig. 6)' and is then released by the typist or
the pull thereon temporarily relaxed, the force
existent at such times in spring 2| tending to
restore the bail to “on” position is insufficient'to
permit stud 23 to cam upward the latch lever
and pass‘ the'nose on said lever. However, if
the typist pulls the bail forward a considerable
distance beyond that of Fig. 2 or 6 (as into
the full “off” position of Fig. 3) and releases
the bail, the bail will receive sufficient return
impetus, due to the added stressing of spring
2| and also to bail momentum acquired before
stud23 contacts nose '30, for the stud to force
itself automatically past the bail latch nose and
45 permit the bail to automatically assume its “on”
position.
'
>
*
'
To facilitate latching off of the bail in the
intermediate “oiT” position thereof shown in Fig.
2, and'also to determine the maximum “o?” po
sition of the bail shown in Fig. 3, there is pro
vided a cam and gravity actuated‘ or controlled
bail stop or arresting device in the form of a
sheet metal link 3|‘ having‘ therein a closed'siot
32 which extends generally longitudinally of the
55 link. Said link or stop device 3| is pivotally held
at one end thereof to side arm I6 of the bail
at a point above the bail pivot 20 by a pivot
element 33 to permit the link or stop device to
swing edgewise up and down relatively to the
60 bail side am. There is also provided for co
action with link 3| an inwardly projecting stud
or pin 34 which extendsthrough the closed slot
32 in the link, said stud 34 being so located that
in the “on” position’ of the bail it is close to
(but preferably out of contact with) that end
of slot 32 adjoining link pivot 33, as. shown in
Fig. 1. Engagementof said stud 34 with the
opposite end‘of the slot 32 determines the full.
or maximum “off” position, of the bail, as shown
70 in Fig. 3. Gravitational force 'on the link tends
to swing the. link downward and forward about
pivot 33' toward a pendant position‘.
'
To facilitate latching of the bail in the‘ posi-l
tion shown in Fig. 2 and to permit shifting of
75 the bail to its full “off” position from either
slot 32.
r
.
The described construction of the bail cast-o?
arresting means comprising link 3| and stud 34
is such that when the typist pulls the bail for 20
ward away from the platen into the position
shown in Fig. 6 (that is, just far enoughfor
slightly farther than is necessary, to permit latch
nose 30 to drop behind stud 23) cam 35 coacts
with stud 34 to throw or flip link 3| upward
and rearward into the bail arresting position
shown in dotted lines in Fig. 6 in which the
abrupt edge of projection 36 is pressed forward
against stud 34 and prevents continuation of for
Ward movementof the bail under continued pull
on the bail. If the typist, when the bail is ar
rested in the position shown in Fig. 6, releases
the bail it' will move slightly rearward into the
position shown in Fig. 2 and will be held there
by latch 22, and the arresting link 3|‘ will be
released by the resultant release of pressure of
abrupt edge of projection 36 against stud 34 and
gravitate into the position of said link shown
in Fig. 2, in which latter- position of the link
stud 34 is to the rear of cam 35 and clear of
projection 36.
'
'
'
'
It will be obvious, therefore, that the typist
may readily cast-01f and latch the bail in the
position of Fig. 2 and may pull the bail for
ward from said latched off position into the max
imum “off” position of Fig. 3. It will also be
obvious that the typist may fully cast off the
bail from the "on” position by pulling the bail
forward into the arrested position of Fig. 6, then
slightly relaxing or reversing the forward pull
to permit dropping of link 3|, and then again
pulling forward on the bail until the forward
motion is arrested with the bail in the position
shown in Fig. 3 by engagement of stud 34 with
the end of slot 32 adjacent the non-pivoted end
of link 3|. Upon release of the hold of the op
erator on the bail, after the bail is brought to
full “off” position, the cam‘ 35 and projection 36
will ride over stud 34 during return of the bail
by spring 2|, and the bail return force due to
the full stretching of spring 2| and the bail mo
mentum acquired before stud 23 engages nose
3|] of the bail latch is such that the stud will
cam the latch upward and ride past nose 30 to
thereby permit automatic full restoration of the
bail from the position shown in Fig. 3 to that
shown in Figs. 1, 4 and 5.
'
Manual release of the bail for restoration by
spring 2| from the latched off position of Fig. 2
may be effected either by rearward pressure on 70
the bail or its handle l8 or by upward rocking
of latch lever 22 by rearward pressure on ?nger
piece 23 of said latch lever.
'
r
' It will be apparent from Figs. 1, 2 and 3 that
in the bail positions shown in Figs. 1 and 2 the 75
3
2,134,097
type bars are‘operable to print without collision
with any part of the baiLincluding the paper
feed rolls :I‘Lbut that in the bail position of Fig.
bail constantly ‘spring urged toward the platen
and manually retractible from paper-pressing
relation with the platen, and retraction limiting
3 such collision (at least with the feed rolls I1)
means for the bail, controlled by the bail to posi
tively stop manual retraction of the bail at ?rst
is possible. ' It’ will be ‘seen, however, that in the
described construction it is impossible for the
typist to accidentally ‘leave the’bail in the posi
tion of Fig; 3 or any otherposition in which the
type bars may collide therewith; thus making it
10 impossible vfor damage" to occur to the types or
bail'from such a collision. It will also be ap
parent that the parts may be so designed that
the latched off and full‘ “off” positions of the bail
may be varied relatively to each other and to the
15 platen from the relative positions shown in the
drawing.‘
‘
What we claim is: ~
~
1.v In a ‘typewriting machine, the combination
of a platen, a manually retractible paper bail
20 mounted 'for‘swinging thereof toward and from
the platen‘ respectively into and out of paper
pressing relation with the platen, spring means
constantly urging said bail toward the platen
and normally yieldingly holding said bail in pa
25 per-pressingrrelation with the platen, and means
controlled by manual retraction of the bail from
its paper pressing relation With the platen to
positively arrest ~such- retraction at a predeter
mined point and controlleolv by relaxation of the
30 manuallyfapplied bail retracting force to permit
one and then the other of two different prede
termined points, at the second of which points
the bail is retracted considerably farther from
the platen than it is at the ?rst point.
5. In a typewriting machine, the combination 10
of a platen, a pivotally mounted paper-pressing
'bail constantly spring-urged toward the platen
and manually retractible from paper-pressing
relation with the platen, means for positively
stopping manual retraction of the bail upon re 15
traction of the bail a predetermined maximum
distance from the platen and controlled by re
traction of the bail a lesser distance from the
platen and a slight partial return movement of
the bail toward its paper-pressing relation with 20
the platen to ?rst positively stop retraction of
said bail and then free the bail for retraction
thereof sai'd'predetermined maximum distance _
from the platen.
~
1
6. In a typewriting machine, the combination 25
of a platen, a pivotally mounted paper-pressing
bail constantly spring urged toward the platen
and manually retractible from. paper-pressing
relation with the platen, and retraction limiting
manual retraction of the bail beyond said prede
means for the bail, controlled by the bail to 30
positively stop manual retraction of the bail at
termined point.
?rst one and then the other of two different pre
p
'2. In a typewriting machine, the combination
of va platen, a manually retractible paper bail
35 mounted for swinging thereof toward and from
the platen respectively into’ and out of paper
pressing relation with the platen, spring‘means
constantly urging said bail- toward the platen
and normally yieldingly holding said bail in pa
peri-pressing relation with the platen, and means
controlled by manual retraction of the bail from
its paper-pressingirelationlwith the platen to
_ positively arrest such retraction at a predeter
mined point and controlled-by ‘relaxation of the
manually applied bail retracting force to permit
manual retraction of the bail beyond said prede
termined point, and means controlled by manual
determined points, at the second of‘ which points
the bail is retracted considerably farther from
the platen than it is at the ?rst point, and de
taining means controlled by the bail to permit
full return of the bail to paper~pressing posi
tion by the constantly exerted spring force upon
release of the bail at the second of'said points
and to prevent such full return of the bail ‘by 40
said spring force upon release of the bailatthe
?rst of said points.
7. In a typewriting machine, the combination
of a platen, a pivotally mounted paper-pressing
bail constantly spring-urged toward the platen 45
and manually retractible from paper-‘pressing
relation with the platen, means for positively
retraction of the bail to said predetermined
point to prevent return of the'bail by said spring
stopping manual ‘retraction of the bail upon re
traction of the bail a predetermined'maximum
means to paper-pressing relation with the platen.
distance from 'the platen and controlled by "50
3. In a typewriting machine, the combination
of a platen, a ‘manually retractible paper bail
mounted for1 swinging thereof toward and from
the platen respectively into and out of paper
55 pressing relation with the platen, spring means
constantly urging said bail toward the platen
and normally yieldingly holding said bail in pa~
per-pressing relation with the platen, means
controlled by manual retraction, of the bail from
60 its paper-pressing relation with the platen to
positively arrest such retraction at a predeter
mined point and controlled by relaxation of the
manually applied bail retracting force to permit
manual retraction of ‘the bail beyond said pre
65 determined point, and means controlled by man
ual retraction of the bail to said predetermined
point to prevent return of the bail by said spring
means to'paper-pressing relation with the platen,
and controlled bythe bail to permit vreturn of the
70 bail by said spring means to paper-pressing re
lation with the platen upon release of the bail
after the manual retraction of the bail beyond
said predetermined point.
4. In a typewriting machine, the combination
75 of a platen, a pivotally mounted paper-pressing
retraction of the bail a lesser distance from the
platen and a slight partial return movement of
the bail toward its paper-pressing relation with
the platen to ?rst positively ‘stop retraction of
said bail and then’ free the bail for retraction 55
thereof said predetermined maximum distance
rom the platen, and detaining means controlled
by'retraction of said bail said lesser distance
from the platen to permit said partial slight re
turn movement of the bail and to‘ hold the bail 60
against further return movement by the con
stantly exerted spring force.
' 8. In a typewriting machine, the combination
of a platen, a pivotally mounted paper-pressing
bail constantly spring-urged toward the platen
and manually retractible from paper-pressing
relation
stopping
traction
distance
with the platen, means for positively
manual retraction of the bail upon re;
of the bail a'predeterrninecl maximum
from the platen and controlled by 70
retraction of the bail a lesser distance from the
platen and a slight partial return movement of
the bail toward its paper-pressing relation with
the platen to first positively stop retraction of
said ball and then free the bail for retraction 75
2,134,097
4
thereof said predetermined maximum distance
from the platen, and detaining means controlled
by retraction of said bail said lesser distance
from the platen to permit said partial slight re
turn movement of the bail and to hold the bail
against further return movement by the con
stantly exerted spring force, said detaining
means being conditioned by maximum retraction
of the bail to permit full return of the bail by
10 said spring force upon subsequent release of the
bail.
-
9. In a typewriting machine, the combination
of a platen, a paper feeding device spring held
in paper feeding relation with the platen and
manually retractible out of paper feeding rela
tion with the platen, and retraction. stopping
means for said device automatically conditioned
by retractive movement of said device from paper
feeding relation with the platen to positively
20 stop retractive movement of said device at a pre
determinedv point and also automatically condi
tion by a slight partial return movement of said
device from said predetermined point to permit
retraction of the device beyond said predeter
25 mined point.
10. In a typewriting machine, the combination
of a platen, a paper feeding device shiftable into
and out of a paper feeding relation with the
platen into which it is spring urged and from
30 which it is manually retractible, means auto
matically conditioned by retraction of said de
vice from its paper feeding relation with the
platen to positively stop such retraction at a pref
determined point and automatically conditioned
35 by a slight partial restoration of said device to
said relation from said point to permit retraction
of said device beyond said point, and means auto
matically conditioned by retraction of said de
vice to said predetermined point to prevent full
40 restoration of said device into paper feeding
relation by the spring force exerted on said de
vice except when said device j is released after
manual retraction beyond said predetermined
point.
'
'
11. In a typewriting machine, the combination
of a platen, a support for the platen, a manually
retractible,paper-pressing bail mounted on said
support for swinging thereof toward and‘ from
the platen and constantly spring urged toward
the platen, a shiftable bail-retraction stopping
50
element pivotally held to said bail, a ?xed bail
retraction stopping element held to said support,
and cam means on said ?rst stopping element co
active with the second stopping element .upon re
traction of the bail to swings-aid ?rst element
about its pivot into a bail-retraction-stopping
engagement with the second element from which
it is pivotally shiftable by the action of gravity
on said ?rst element upon a slight return move
ment of the bail.
'
12. In a typewriting machine, the combination
of a platen, a support for the platen, a manually
retractible paper-pressing bail mounted on said
retraction of the bail to swing said ?rst element
about its pivot into a bail-retraction-stopping
engagement with the second element from which
it is pivotally shiftable by the action of gravity
on said ?rst element upon a slight return move
ment‘of the bail, and releasable means
taining the slightly returned ball against
return movement under the, in?uence
spring force urging the bail toward the
for de
further
of the
platen.
13. In a typewriting machine, the combination 10
of a platen, a support therefor, a. manually re
tractible paper bail pivotally mounted on said
support for swinging movement toward and from
the platen and constantly spring urged toward
the platen, a bail-retraction stopping element ll
pivotally held at one end of the element to the
bail to swing transversely of the pivotal axis of
the bail, a ?xed stopping element on the sup
port, said pivoted stopping element having two
abutment means spaced di?‘erent distances from
its pivot to engage said ?xed stopping element
at di?erent points in retractive movement of the
bail to arrest such movement, said pivoted ele
ment having cam means engageable with the
?xed element during bail retraction to cause
stopping engagement between the ?xed element
and the abutment means nearest the pivot of the
pivoted element and to permit bringing of the
second abutment means into bail retraction stop
ping engagement with said ?xed element by a
partial restoration and greater retraction of the
bail.
14. In a typewriting machine, the combination
of a platen, a platen carrier, a paper bail pivoted
on the carrier to permit retraction of the bail
from the platen, and means connecting said ball
and platen‘carrier and controlled by bail move
ment to positively stop bail retraction at di?er
ent points.
,
c
15. In a typewriting machine, the combination
of a platen, a platen carrier, a paper bail pivotedv
on the carrier to swing about a horizontal axis
and constantly spring urged toward the platen,
a link pivoted ‘at one end to the bail to swing
about a horizontal axis under the influence of
gravity and having a pin and slot connection
with the platen carrier operative to arrest re
traction of the bail from the platen at first one
and, then the other of two different points and
to free the bail for retraction to the farthest one
of said points by a'slight restoration of the ball
from the other one of said points, such freeing
of the bail being effected by a pivoted movement
of the link under the in?uence of gravity, and
said link being freed for such movement by said 55
slight partial restoration of the bail.
16. In a typewriting machine, the combination
of a platen, a platen carrier, a paper bail pivoted
on the carrier for retraction from the platen
and spring urged toward the platen into paper 60
pressing relation with the platen, means con
necting the bail and carrier and controllable by
pivotal movements of the bail to positively stop
retractive movement of the ball at ?rst one and
then the other of two diiferent points, and means 66
for preventing automaticv spring restoration of
support for swinging thereof toward and from
the platen and constantly spring urged toward
the platen, a shiftable bail~retraction stopping
element pivotally held to said bail, a ?xed bail _ the bail from the ?rst one of said points into
retraction stopping element held to said support, paper pressing relation with the platen.
HENRY ALLEN AVERY.
cam means on said ?rst stopping element co
JOSEPH P. BARKDOLL.
70
active with the second stopping element upon
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