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Патент USA US2294691

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Sept 1, 1942-
H; LQ‘PITMAN
‘ 2,294,691
TYPEWRITING MACHINE
Filed March 4, 1940
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INVENTOR
HEN/Q!’ L. P/7/74/V
Patented Sept. 1, 1942
2,294,691
VUNITED STATES PATENT OFFICE
2,294,691
TYPEWRITIN G MACHINE
Henry L. Pitman, Hartford, Conn., assignor to
Underwood Elliott Fisher Company, New York,
N. Y., a corporation of Delaware
Application March 4, 1940, Serial No. 322,079
10 Claims. (Cl. 197-—17)
This invention relates to typing machines and
arm of said lever, l6 there is a lever having a
more particularly to connections whereby an
rearwardly extending arm forming a draw link
operatable part is connectible to a power driven
snatch roll for a consequent power driven stroke
of said part.
~
Such connection may include a connector,
l9 and a forwardly extending arm 20 engageable
by the key plunger 2|.
Depression of the key plunger 2| rocks said
lever I9, 20 counterclockwise about I8 thereby
preferably a draw link, connected to the op
raising the draw link Hi to bring a toothed pawl
eratable part and movable into position for de
22 pivoted on said link H! at 23 into engage
termining its connection with a rotary toothed
ment with the snatch roll l0. As will be noted
snatch-roll.
10 from the drawing, the pitch of the teeth of the
An object of the invention is to control the
pawl 22 may be slightly less than the pitch of
speed at which the toothed periphery of the
the teeth of the snatch roll H).
snatch roll drives the link, and hence the op
The pawl has a tail 24 which in the normal
eratable part, particularly at the start of the
Figure 1 position of the parts extends rearward
power driven motion of said link and part so
ly and lies ?at upon a transverse bar 25 secured,
that said start may be effected smoothly to re
adjustably as will later be described, to the type
duce jarring and wear upon the mechanism. 7
writer framework.
The draw link may have a toothed pawl or
Upon raising the draw link by operation of
rotary member pivoted thereto as the medium
the key plunger 2| and hence meshing the
engaged by the snatch roll. A further object 20 toothed pawl 22 with the teeth of the snatch
is to have such pawl or member acted upon by
roll the latter initially rotates said pawl clock
the snatch roll as a lever to move the draw link
wise about the pivot 23 relatively to the link.
at a lesser speed than the linear speed of the
While the pawl is being so rotated, the tail there
snatch roll teeth. For‘this purpose said lever
of reacts as a cam against a corner 26 of the
may react against an abutment. The lever ac 26 abutment bar 25 so that the pawl is urged to
tion also serves to urge the pawl into proper
ward the snatch roll. It may be during this time
engagement with the snatch roll.
and possibly for a period thereafter that the
The pawl acts as a lever, in moving the link,
pawl acts as a lever of the second order to move
during a time that the pawl is being rotated
the draw link to the right as viewed in the draw
from a normal position on the link to a stop
ing. It will be seen, therefore, that while the
3.0 pawl
position on said link.
is acting thus as a lever, the draw link |9
Another object of the invention is to provide
will be moved to the right at less speed than the
for adjustment to vary the period in which the
linear or peripheral speed of the snatch roll
pawl acts as a lever to control the speed of move
teeth. The pawl thus acts as a lever during the
ment of the link.
35 time it is rotated to the position where its cor
The above and other objects and features of
ner 21 stops against an edge 28 of the draw
the invention will be fully understood by refer
link l9 as shown in Figure 3.
ence to the accompanying drawing in which:
Further rotation of the snatch roll, after the
Figure 1 is a side elevation of a type action,
Figure 3 position of the parts is attained, moves
illustrative of an operatable part, and connec
the link and pawl as a unit, that is, without fur
tions whereby said type action is connectible to
ther rotation of the pawl relatively to the link,
a snatch roll.
until just before the type bar reaches the platen
Figures 2 and 3 are side elevations and repre
whereupon the link will have become discon
sent relative positions of the parts at di?erent
nected or deflected away from the snatch roll by
stages.
‘
45 having encountered a knock-off 29.
||l represents a toothed snatch roll journaled
The pawl 22 is thicker than the draw link I!)
in the frame of the machine and connected to
and is slotted below its toothed part 30 so that
and constantly rotated counterclockwise by a
its consequently formed sides which include the
suitable motor, not shown. A type bar H is
tail 24 straddle said draw link. The slotting of
swingable upwardly and rearwardly from the 50 the pawl 22 also forms the stopping corner 21
normal Figure 1 position to strike a platen l2.
thereof. The link I9 may be relieved at 3| to
A bell crank l3 connects said type bar to an
clear the top of the pawl slot when the pawl is
operating lever l4 connected by a link Hi to a
in the normal Figure 1 position relatively to the
lever l6 fulcrumed on a transverse rod H in
link I9. Said link l9 may have a return spring
the framework. Pivoted at l8 to a depending 55 32 anchored to the framework and cooperating
2,294,691
2
to return the parts to normal position after the
link l9 becomes disconnected from the snatch
roll by encountering the knock-off 29.
The period during which the pawl acts as a
lever to govern the speed of the draw link I9
relatively to the snatch roll may be varied by
adjusting the abutment bar 25. To this end
said abutment bar may have elongated slots 31
at its ends which permit rearward or forward
combination with an operatable part and a rotary
toothed-snatch-roll, of a connector connected to
said part, a toothed pawl pivoted on said con
nector, said connector being movable into posi
tion for meshing said pawl with said snatch roll,
said pawl being initially rotatable to a stop posi
tion relatively to said connector by said snatch
roll upon meshing with the latter, an abutment
on the frame against which said pawl reacts
adjustment of said bar relatively to the pawl 22. 10 during its rotation relative to said connector so
Fastening screws 36 for said bar 25 pass through
said slots and are threaded into the framework
35 of the machine.
The bar 25 may be so adjusted that during the
lever action of the pawl upon thedraw link [9
the type bar ll moves from its normal Figure 1
as to cause said pawl to act as a lever upon said
connector to move said connector initially at a
part-operating speed less than the linear speed
of the snatch roll teeth, said abutment being ad
justable on said frame relatively to said pawl
position to, say, the dotted line position, Figure 1.
Such lever action of the pawl in moving the type
bar to said dotted line position materiallyre
for varying the action of said pawl as a lever.
5. In a typing machine; the combination with
an operatable part, and a rotary toothed-snatch
roll, of a connector connected to said part, a
ment of the type action or other snatch roll
said pawl with said snatch roll, said pawl being
duces the jar and wear which would otherwise 20 toothed pawl pivoted on said connector, said con
nector being movable into position for meshing
attend initiation of the snatch-roll driven move
initially rotatable to a stop position relatively to
said connector by said snatch roll upon meshing
Variations may be resorted to within the scope
of the invention, and portions of the improve 25 with the latter, said pawl having a tail, and
means against which said tail reacts during ro
ments may be used without others,
tation of the pawl relatively to said connector so
What is claimed is:
as to cause said pawl to act as a lever upon said
1. In a typing machine; the combination with
connector
to move said connector initially at a
an operatable part, and a rotary toothed-snatch
roll, of a connector connected to’said part, a 30 part-operating speed different from the linear
speed of the snatch roll teeth.
toothed pawl pivoted on said connector, said con
6. In a typing machine; the combination of a
nector being movable into position for meshing
part
movable in a working stroke, a power-op
said pawl with said snatch roll, said pawl being
erable mover, a lever, a lever pivot and stop on
initially rotatable to a stop position relatively to
driven part.
said connector by said snatch roll upon meshing
with the latter, and means against which said
pawl reacts during its rotation relative to said
connector so as to cause said pawl to act as a
lever upon said connector to move said con
nector vinitially at a part-operating speed dif
ferent from the linear speed of the snatch roll
said part, said part being normally positioned so
that said lever is disengaged from said mover,
means operable to move said part into position
to bring an arm of said lever into engagement
with said mover so that thereupon said lever is
40 turned by said mover upon said pivot until ar
rested by said stop, and a substantially separate
abutment against which another arm of said
teeth.
lever
reacts, while turning about said pivot, to
2. In a typing machine; the combination with
translate the turning of the lever into stroke
an operatable part, and a rotary toothed-snatch
roll‘, of a connector connected to said part, a 45 movement of said part.
7. In a typing machine; the combination of a
' toothed pawl pivoted on said connector, said con
part
movable in a working stroke, a power-oper
nector being movable into position for meshing
able mover, a lever, a lever pivot and stop on
said pawl with said snatch roll, said pawl being
said part, said part being normally positioned
initially rotatable to a stop position relatively to
said connector by said snatch roll upon meshing 50 so that said lever is disengaged from said mover,
means operable to move said part into position
with the latter, means against which said pawl
reacts during its rotation relative to said con
nector so as to cause said pawl to act as a lever
upon said connector to move said connector in
itially at a part-operating speed di?erent from
the linear speed of the snatch roll teeth, and
means for adjusting said last named means rela
to bring an arm of said lever into engagement
with said mover so that thereupon said lever is
turned by said mover upon said pivot until ar
rested by said stop, and a substantially separate
abutment against which another arm of said
lever reacts, while turning about said pivot, to
translate the turning of the lever into at least
tively to said pawl for varying the action of said
an initial part of the stroke of said part, said
pawl as a lever.
3. In a typing machine having a frame; the 60 stroke being completed in that said mover moves
said part and lever together after said lever is
combination with an operatable ‘part and a rotary
arrested by said stop.
_
toothed-snatoh-roll, of a connector connected to
8. In a typing machine; the combination of a
said part, a toothed pawl pivoted on said con
part movable in a working stroke, a rotary
nector, said connector being movable into posi
snatch-roll, a lever, a lever pivot and stop on said
tion for meshing said pawl with said snatch
part, said part being normally positioned so
roll, said pawl being initially rotatable to a stop
position relatively to said connector by said
that said lever is disengaged fromsaid snatch
snatch roll upon meshing with the latter, an
roll, means operable to move said part to bring
abutment on the frame against which said pawl
an arm of said lever into engagement with said
reacts during its rotation relative to said con 70 snatch-roll so that thereupon said lever is turned
nector so as to cause said pawl to act as a lever
by said snatch-roll upon said pivot until ar
upon said connector to move said connector in
rested by said stop, and a substantially sepa
itially at a part-operating speed less than the
rate abutment against which another arm of
linear speed of the snatch roll teeth.
said
lever reacts, while turning about said pivot,
4. In a typing machine having a frame; the 75
2,294,691
3
to translate the turning of the lever into stroke
10. In a typing machine; the combination of a
,
part movable in a Working stroke, a rotary
9. In a typing machine; the combination of a
snatch-roll, a link connected to said part, a lever
type-actuator movable in a typing stroke, a r0
pivoted
said link, said link being movable to
tary snatch-roll, a lever, a lever pivot and stop 5 bring anon
arm of said lever into substantially roll
on said actuator, said actuator being normally
ing engagement with said snatch roll, where
positioned so that said lever is disengaged from
upon said lever is turned by said snatch roll
said snatch roll, means operable to move said
upon
its pivot, said lever and link having stop
actuator into position to bring an arm of said
lever into engagement with said snatch-roll so 10 means to limit the extent of turning of said lever
by the snatch roll, and a substantially sepa
that thereupon said lever is turned by said
rate
abutment against which another arm of
snatch-roll upon said pivot until arrested by said
movement of said part.
stop, and a substantially separate abutment
against which another arm of said lever reacts,
while turning about said pivot, to translate the 15
turning of the lever into stroke movement of
said type-actuator.
said lever reacts, while turning about said pivot,
to translate the turning of the lever into move
ment of said link to effect stroke movement of
said part.
HENRY L. PITMAN.
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