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Патент USA US2404861

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July 30, 1945.
E. F. PYETSCHAUER 7
2,404,861
PAGE END INDICATOR FOR TYPEWRITERS
Filed April 17, 1945
ATTORNEYS
Patented July 30,1946
2,404,861
i'
UNITED STATES PATENT OFFICE *
2,404,861‘
I
PAGE‘END' mmcA'roR FOR TYPEWRITERS ‘
Edward F. Petschauer, Cleveland, Ohio’
> ‘
Application April 17, 1945, Serial No. 588,854
5 Claims‘
(Cl. 197—189)
H
The present invention relates to new and use
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means of a bearing sleeved secured to'theframe.
ful ‘improvements in page end indicators for
An annular member or disc 9 is rotatably
typewriters embodying an audible signal, such as
a bell,gan'd mechanism to sound the bell when a
mounted on the sleeve and‘ is formed with a
spiral
predetermined point in the work sheet has been
reached, such as the end of the page.
'An important object of the present invention
is, to provide a page end indicator adapted to
notify and warn the operator of the machine
thatthe end of the page is reached or ap
proached, thus eliminating the necessity of the
operator dividing his attention between the work
in
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‘l
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angularly and inserted in the groove [0 while the '
other end of the traveler indicated at I2 extends
transversely through ‘an opening in» the’ shaft
to
and the‘ progress of the paper feeding, and also
assuring a uniformity in appearance of the
work sheet.
groove
Av traveler or followerv H has one end’ bent
v
More speci?cally, the invention comprises ‘an
annular member adapted for attaching to the
for slidable movement therein, the traveler" It
also extending through a sleeve section Bw'fse
‘cured to the shaft forrotation therewith. -
A clapper !3 is pivoted to one side of‘_ the disc
9 with the end of the clapper held in‘ engage‘
ment with a bell l4 by‘means of a coiYspring
15, said bell being secured to the sleevetw ‘ ; ‘As‘indicated in Figure 2 ‘ of the drawing, the
clapper extends across or ‘transversely of A‘ the
platen shaft of the typewriter and held against
groove it at its outer end‘ in the-path‘ offthe
traveler H so that upon the‘travele‘r reaching
rotation and having a spiral groove formed
therein with a follower arranged to travel in the 20 the outer end of the spiral groove, the‘clapper
will be engaged for moving the same into con
groove and rotated with the shaft and adapted
to actuate a bell clapper when the follower or
traveler reaches the end of the groove, the groove
being of a length substantially to‘ correspond
to the‘ length of a sheet of paper mounted on the
platen of the typewriter.
A further object isytoprovide a device of this
character of simple and practical construction,
whichis ef?cient and'reliable in operation, which
tact with the bell to sound the alarm.
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A coil spring I6 is mounted-- on" the shaft
with one end connected to the disc 9- and its
other end inserted in the shaft 5 and the disc is
held stationary against rotation by'the tension
of the spring l6 by means of va dog ll‘ engaging
the toothed edge l8 of the disc, the dog being
carried at and extending downwardly from one
may be easily and quickly mounted in position 30 end‘ of a; pivoted arm 19 attached to the upper
on a typewriter without necessitating any ma
terial changes in construction or alterations
therein; and‘ which otherwise is well adapted for
the purposes for which the same is intended.
Other objects and advantages reside in the
portion of the frame ‘I, the‘ other end of the arm
having (a ‘key 20 projecting ' upwardly- therefrom,
whereby a depressing movement-‘of the key- will
details of construction and operation as more .
cause the raising of the dog ll out of engage
ment with the teeth l8 of the disc and permit
rotation of the disc under the influence of the
fully hereinafter described and claimed, refer
spring Hi.
ence being had to the accompanying drawing
forming part hereof, wherein like numerals refer
The end of the arm I!) provided with the dog
I‘! is off balance so that the dog will normally
to like parts throughout, and in which:
40 gravitate into engaging position with the teeth
is of the disc.
Figure 1 is a fragmentary elevational view of
In the operation of the device, a sheet of paper
one end of a typewriter platen and with the
is placed in the typewriter under the platen 5
alarm device mounted thereon and shown in
into typing position and the key 20 is depressed,
section.
Figure 2 is a transverse sectional view taken 45 whereby the dog I‘! will be released from the
teeth I8 of the disc and the spring It will rotate
substantially on a line 2--2 of Figure 1.
the disc in a direction to move the traveler I l
Figure 3 is a top plan view.
into a position at the inner endof the spiral
Figure 4 is an enlarged detail of the clapper
groove in and the typing proceeded with in its
for the bell.
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Referring now to the drawing in detail, where 50 usual manner.
The rotation of the platen 5 during the pro
in for the purpose of illustration I have disclosed
gressive feeding of the paper therethrough will
a preferred embodiment of the invention, the
cause the traveler l l to move from the inner end
numeral 5 designates the typewriter platen and
of the spiral groove Ill toward the outer end
the numeral 6 represents the platen shaft jour
naled in a carriage frame ‘I of the typewriter by 55 thereof, the time required for the traveling of
2,404,861
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the traveler II from the inner end to the outer
end of the groove being substantially equal to
the time required for a sheet of paper to be fed
through the machine.
adapted .to engage and actuate the clapper upon
reaching the outer end of the guide, spring means
for rotating the disk to return the traveler to
the inner end of the guide, said disk having a
toothed edge, and a manually operable dog en
groove, the clapper I3 will be actuated to strike
gaging the teeth to secure the disk against ro
the bell l4 and thus sound the alarm to indicate
tation.
that the end of the sheet of .paper has been
3. A page end alarm for typewriters compris
reached.
ing in combination a platen shaft, a disk freely
As indicated in Figure 4 of the drawing, the 10 mounted on the shaft and having a spiral groove
clapper" includes ashank l3a having a pivoted
therein, a bell surrounding the disk, a clapper for
inner spring biased extension l3b adapted to
the bell and disposed transversely of the groove
actuate'the clapper upon engagement by the
at its outer end, a traveler connected to the shaft
traveler, the extension swinging backwardly with
for rotation therewith and radial movement with
the traveler when the latter is reset.
15 respect thereto, said traveler traveling in the
In view of the foregoing description, taken in
‘groove and adapted to engage and actuate the
' As the traveler approaches the outer end of the
conjunction with the accompanying drawing, it
clapper upon. reaching the outer end of the
is believed that a clear understanding of the
groove, spring means for rotating the disk to re
construction, operation and advantages of they
turn the traveler to the inner end of the groove,
article will be quite apparent to those skilled in 20 and means securing the disk against idle ro
theart. A more detailed description thereof is
accordingly deemed unnecessary,
tation.
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4. A page ‘end alarm for typewriters compris
ing in combination a platen shaft, a ‘diskfreely
, It ‘is to be understood, however, that even
though I have herein shown and described a
mounted on the shaft and having a spiral groove
preferred embodiment of my invention, the same 25 therein, a bell surrounding the disk, a clapper, for
is susceptible to certain changes fully compre
the bell and disposed transversely of the groove
hended by the spirit of the invention as herein
described, and the scope of the appended claims.
for rotation therewith and radial movement with
at its outer end, a traveler connected to the shaft
respect thereto, said traveler traveling in the
Having thus described the invention, what I
claim, is?
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1. A page end alarm for typewriters compris
ing in combination a platen shaft, a disk freely
mounted on the shaft and having a spiral guide
on‘ one of its faces, a bell surrounding the disk,
groove and adapted to engage and actuate the
clapper upon reaching the outer end of the
groove, spring means for rotating the’ disk to re
turn the traveler to the inner end of the groove,
said disk having a toothed edge, and amanually
a clapper for the bell and disposed transversely 35 operable dog engaging the‘teeth to secure the
disk against rotation.
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ofthe guide at its outer end, a traveler carried
by the shaft for rotation therewith and radial
5. A page end alarm for typewriters compris
movement with respect thereto, said traveler “en
ing in combination a platen shaft, a disk freely
mounted on the shaft and having a spiral groove
' gaging the guide for movement thereon and
adapted to engageand actuate the clapper upon 40 therein, a bell surrounding the disk, a clapper
reaching the outer end of the guide, spring means
for rotating the disk to return the traveler to
the inner end of the guide, and means securing
for the bell and disposed transversely of the
groove at its outer end, aftraveler connected to
the shaft for rotation therewith and radial move
the disk against rotation.
‘ment with respect thereto, said traveler travel
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2. A page end alarm for typewriters compris 45 ing in the groove and adapted to engage and
prising in combination a platen shaft, a disk
actuate the clapper upon reaching the outer. end
freely mounted on the shaft and having a spiral
of the grove, spring means for rotating the disk
guide‘ on one of its faces, a bell surrounding the
to return the traveler to the inner end of the
disk, a clapper for the bell and disposed trans
groove, said disk having a toothed edge,and a key '
versely» of the guide at its outer end, a traveler 50 operated dog engaging the teeth to secure-the
slidably mounted transversely of the Shaft for
disk against rotation.
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rotation therewith and including an angular end
engaging the guide for movement thereon and
EDWARD F. PETSCHAUER.
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