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Патент USA US2402936

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June 25, ì946.
Filed Jan. 16, 1945
2 Sheets-Sheet l
June 25, 1946.
H. s. sLocUM
Filed Jan. 16, 1945
2 sheets-sheet z
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515:[email protected]@ZL/75
Patented June 25, 1946
Harold S. Slocum, Waukegan, Ill.
Application January 16, 1945, Serial No. 573,001
5 Claims.
(Cl. 197-189)
2 .
It is the object of this invention to provide
novel means whereby a signal will be given when
paper which is to form a manuscript has been
rolled to a predetermined extent on the platen of
a typewriter, the device being of use to prevent
typing from being continued to a place objection
ably close to the lower edge of the paper, and be
ing of use, also, to Warn an operator to cease
typing at any predetermined place between the
upper and lower edges of the paper.
A preferred embodiment of the invention will
of the carriage C, the inner end of the spring be
ing made fast to the hub of the pulley I0.
The release lever for the paper clamp appears
at I4 and is fulcrumed at I5 on the body of a
typewriter. Neither the paper clamp nor the body
of the typewriter is shown in the drawings. A
Y radius arm I6 is pivoted at I‘I to the release lever
I4 and terminates in a fork I8 receiving the platen
shaft 5. On the inner surface of the radius arm
I6, at the base of the fork I8, there is a lateral
offset I9, which acts cam-wise against the hub
be described, and is shown in the drawings; but
‘ of the pulley I0.
since typewriters are of different constructions, it
A shaft 20, of polygonal cross-section, extends
is to be understood that a mechanic working
longitudinally of the carriage C and is supplied
within the scope of what is claimed, may make 15 at its ends with trunnions 2| which are jour
such changes as his skill may direct, without de
naled in the end members of the carriage. The
parting from the spirit of the invention.
shaft 20 has oppositely disposed, longitudinal ball
In the accompanying drawings:
races 22. A butler spring 23 is secured at one end
' Figure 1 shows in top plan, a device constructed
in accordance with the invention, parts being
broken away;
Figure 2 is a front elevation;
Figure '3 is a section taken through the pulley l
attendant parts;
Figure 4 is a section on the line 4-4 of Fig. 3;
Figure 5 is an elevation showing the release
lever for the paper clamp and parts associated
of the shaft 20.
A slide 24 is mounted for reciprocation on the
shaft 20, but is held against rotation thereon;
The slide 24 houses anti-friction balls 22a, re
ceived in the ball races 22 of the shaft 20. The
slide 2d carries an index finger 25, so located as to
cooperate with the scale 2 on the front bar I of
the typewriter carriage C.
A direction changing idler 26 is journaled on
the forward surface of the'shaft 2D, and is dis-~
Figure 6 is a top plan showing one of the shafts;
posed at that end of the shaft which is remote
Figure 'l' is an elevation of the vshaft shown in 30 from the pulley Il). Idlers 28 and 21 are journaled
_ Figure 6;
on the shaft 20 and are located adjacent to the
Figure 8 is a transverse section taken adjacent
to the slide;
Figure 9 is an elevation of the slide and asso
pulley I0, and are oppositely disposed.
and attendant parts;
the idler 2'I and longitudinally of the shaft 28, the
opposite end of the flexible element being at
common axis of the idlers 21 and 28 is disposed
at right angles to the axis of the idler 26.
ciated parts;
One end of a flexible element 29 is secured to
C.: Ul
Figure 10 is a top plan of the cam on the slide,
the pulley l0, the flexible element extending over
Figure 11 is an elevationof the connecting rod
and associated parts.
tached at 30 to the slide 24.
One end of a flex
The device forming the subject matter of this 40 ible element 3| is attached at 32 to the slide 24,
application is capable of use on typewriters of
the ilexible element specified being extended
widely different sorts, but by Way of illustration
around the idler 2B and around the idler 28, the
there is shown a typewriter carriage C, compris
opposite end of the flexible element being secured
ing a front bar I, supplied on its forward surface
to the pulley IU. The flexible elements 29 and 3l
with a scale 2 and on its rear surface with a lon 45 are wound in opposite directions about the tread
gitudinal rack 3. A platen roller 4 is depicted,
of the pulley ID.
and is secured to a shaft 5, journaled in the
The slide 24 is supplied with a cam 33, which
end members of the carriage C.
is adapted to engage a projection 34, forked as
A cone clutch B is secured at l to the platen
at 35, to receive and clamp on the front bar I of
shaft 5, and houses a compression spring 8 which 50 the carriage C. and capable of being placed any
acts lengthwise of the shaft 5. The clutch 6 co- where along the front bar'. More than `one of
the projections 34 may be employed, and they
operates with a recess 9 in the inner surface of
a pulley I0, which is loose on the shaft 5. The nu
may be removed one after another, when each
meral II marks a torsion spring, the outer end
has served its purpose, as hereinafter described,
_of which is anchored at I2 to one end member 55 the scale 2 constituting means whereby the pro
the fork I8 of the radius arm I5, will depend on
the make of the typewriter on which the device
is used. On some typewriters the lever |4 occu
pies the solid line position of Figure 5 when the
paper is gripped; on others it occupies the dot
ted line position of that figure when the paper
jections may be placed in any desired locations
along the front bar.
A shaft 36 extends longitudinally of the car
riage C, at the rear portion thereof, the shaft
being journaled in the end members of the car~
riage. A crank arm 31 is secured to the shaft 3B
and is disposed adjacent to the pulley |0. The
rear end of a rigid connecting rod 38 is pivoted
at 39 to the crank arm 31, the forward end of the
rod being pivoted at 40 to a crank arm 4| on
the shaft 20.
is gripped.
What is claimed is:
1. In a warning device for typewriters, a. type
writer carriage, a platen shaft journaled on the
carriage, a- pulley loose on the platen shaft, a re
leasable _clutch connection between the pulley
and the platen shaft and constituting means for
imparting direct rotation to the pulley from the
platen shaft, a guide shaft mounted to rock on
The shaft 36 is slidable in and rotatable with
a striker 42 tiltably mounted in a bracket 42' 1n
which shaft 36 is slidable and rotatable. This
bracket is located on any accessible part 44 of the
the carriage, a slide mounted to reciprocate on
~typewriter frame where it can strike a bell 43
also mounted on said part.
the guide shaft, the slide and the carriage hav
The precise means
ing parts which interengage to impart rocking
whereby the bell 43 is sounded, Aby the operation
movement to the guide shaft in one direction,
of the shaft 36, may be altered within wide lim
its, without a corresponding departure from the 20 when the slide has been advanced a predeter
mined amount, and then clear, to set the guide
spirit of t e invention.
shaft free for rocking movement in an opposite
The sha t 20 may be referred to as a guide
direction, a ñexible element having its end por
shaft. The slide 24 and the carriage C have
tions wound in opposite directions about the pul
parts (to wit, the cam 33 andthe projection 34)
which impart rocking movement to the guide 25 ley and secured'thereto, the slide being inter
posed in the flexible element, means on the car
shaft when the slide has been advanced to a pre
riage for guiding the iiexible element, a signal
determined place. The flexible elements 29 and
supported adjacent to the carriage, signal-actu
3| may be considered as a flexible element where
in the slide 24 is interposed. The shaft 36 may be
- called a signal shaft.
ating mechanism connected to the guide shaft
30 and operative when the guide shaft is set free,
»and resilient means for imparting reverse rota
tion to the pulley when the clutch connection is
thrown out.
paper for the beginning of a new line, the clutch
2. A warning device for typewriters, construct
mechanism 6-9 of Figure 3 imparts partial ro
tation to the pulley l0, and the torsion in the 35 ed as set forth in claim 1, and wherein the inter
engageble parts on the slide and on the carriage
spring || is increased. The flexible element 3|
comprise a cam on the slide and a transverse
pays oiî the pulley l0, and the flexible element
Each time that the platen shaft 5 is given a
partial rotation, in the usual way, to roll up the
29 is wound about the pulley, the slide 24 moving
to the r’mht on the shaft 20, which at that time
is not under rotation.
Ultimately, the slide 24 is advanced to a place
projection on the carriage and engageable bythe
3. A warning device for typewriters, construct
ed as set forth in claim 1, in combination with
means for mounting the said interengageable
part of the carriagefor adjustment longitudi
l on the shaft 20, and that shaft is given a partial
nally of the carriage.
rotation. The crank arm 4|, the connection 38
4. A warning device for typewriters, construct
and the crank arm 31 rotate the shaft 3S, and the 45
ed as set forth in claim 1, in combination with
striker 42 gives a tap to the bell 43, as the cam
a release for the clutch connection, the release
clears the projection 34 on the shaft 20.
comprising the paper-grip release-lever of a
The operator moves the lever I4 to the solid
typewriter, and a radius arm pivoted to the le
line position of Figure 5, and the cam projection
or offset |9 on the radius arm I6 moves clear of 50 ver and having a cam which engages _the pulley
to maintain the clutch connection operative, the
the hub of the pulley |0. The spring 8 of Fig
radius arm being slidably supported on the plat
ure 5 moves the puiley ID to the right. The
en shaft, to free the cam from the pulley, and
clutch 6--9 lets go, and pulley I0 is rotated re
the pulley being slidable longitudinally of they
versely by the spring ||. ‘The ñexible element 29
pays off the pulley I0, and the flexible eleinent 3| 55 platen shaft, to set free the clutch connection.
5. A warning device for typewriters, construct
is wound about the pulley. The slide 24 is car
as set forth in claim 1, and wherein the signal
ried to the left until it engages the buffer spring
actuating mechanism comprises a signal shaft
mounted to rock on the carriage, means on the
When the operator moves the lever |4 to the
dotted line position of Figure 5, the cam projec 60 signal shaft for operating the signal, crank arms
on the signal shaft and the guide shaft, and a
tion I9 on radius arm assumes the position of
connection pivoted to the crank arms.
Figure 5, the pulley '|0 moves to the left, and the
clutch elements 6_9 are interengaged. The po
sition of the cam projection I9, longitudinally of
, where the cam 33 rides across the projection 34
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