вход по аккаунту


Патент USA US3031067

код для вставки
April 24, 1962
Filed Feb. 20, 1961
BY 6
ilnited States
Patented Apr. 24, 1962
in the ?gure, a ratchet wheel 18. As shown in FIGURES
1 and 2 the end plates mount a cross shaft 20 which ro
tatably supports a lever arm 22. The lever arm is articu
Olin P. Williams, West Hartford, Conn, assignor to Royal 5 lately connected as at 24 to an actuator pawl 26 Which
extends through a slot 28 formed in a guide 30 ?xed to
McBee Corporation, Port Chester, N.Y., a corporation
of New York
and depending from a cross bar 31 forming part of the
Filed Feb. 20, 1961, Ser. No. 90,458
4 Claims. (Cl. 197—114)
carriage frame structure. The slot 28 is elongated ver~
tically so as to enable the pawl 26 to move vertically as
This invention relates to line spacing mechanism for
typewriters or like business machines; more particularly
it relates to line spacing mechanism characterized by
control means operable to effect uniform line spacing
from any position of the machine carriage; and spe
ci?cally it relates to line spacing mechanism wherein 15
said control means may be operated repeatedly for as
long as a line space function control key is held de
Well as substantially horizontally with respect to guide 30.
The pawl 26 has a pointed front end or nose 32 which
normally is retracted from the ratchet wheel under the
action of the lever arm 22 and lever arm return spring 34
connected at its lower end to the lever arm as at 36 and
at its other end to a ?xed part 38 of the carriage. The
pawl is also held in relatively raised position by a spring
40 connected on its lower end to the pawl and at its upper
end to a ?xed part of the carriage. Also connected to
the lever arm 22 as at 36 is a dimensionally stable cable
In electric typewriters presently in use line spacing is
42 which extends rearwardly and around a pulley 44
effected upon rotation of a ratchet either by a pawl oper 20 mounted on a cross bar forming part of the carriage
able in response to the pull of the carriage return draw
frame structure, and across the length of the carriage
band, or by a pawl secured on one end of and operable
in response to the partial rotation of a repeat line space
to end plate 14 where it is secured as at 45.
As shown in FIGURE 1 which illustrates the carriage
in a centrally located position with respect to the type
is actuated by an element whose position is ?xed relative 25 writer frame, the cable 42 extends between rollers 47
to the typewriter frame. As the typewriter carriage
mounted on the arms 46 of a Y-shaped yoke member 48
moves in letter space direction then, the distance be
which is secured to the machine frame, and a roller 50
tween the pawl and the actuating element increases. As
mounted on an actuator 52 adapted to be cycled between
this distance increases the torsional de?ection experienced
the arms v46 down and back to the normal position shown
by the bail also increases with the result that when the 30 in FIGURE .1 upon depression of a repeat line space key
distance between actuating element and the pawl end
(not shown). The mechanism for cycling the actuator
of the bail is appreciable, the pawl end does not rotate
52 is fully described in Patent 2,728,438 which disclosure
su?iciently to impart a full stroke to the pawl to effect
is incorporated by reference herein. The downward
bail supported by the typewriter carriage. The line bail
a uniform line space increment.
As a result of the above machines having extra long
carriages are not provided with line space mechanism
operable from any carriage position.
movement of the actuator 52 pulls down on the taut cable
42 thereby forming a loop 55 between arms 46 as shown
in dotted line in FIGURE 1 and, as a consequence, to
rock lever arm 22 causing the pawl 26 to slide forwardly
in slot 28 into engagement with the ratchet 18 to effect
vided mechanism adaptable to carriages of any length
rotation of the platen one increment. As is evident
for effecting line spacing or uniform repeat line spacing 40 when the actuator 52 returns to normal the pawl 26 is
In accordance with the instant invention there is pro
‘from any position of the carriage. Brie?y, the mecha
nism comprises a dimensionally stable taut cable secured
at one end to a pawl crank arm supported by the carriage
adjacent the line space ratchet, and at the other end to
retracted and the loop ‘55 is pulled straight under the
action of return spring 314. Repeated cycling of the
actuator 52 will effect repeat line spacing in similar
It is to be noted that the cable 42 will be
the opposite end of the carriage. Looping the cable be 45 pulled down the same amount each time that the actu
tween the ?xed and movable support results in movement
of the latter thereby effecting a line space.
An object of the invention is in the provision of novel
line spacing mechanism ‘controllable from any carriage
A further object of the invention is in the provision
of a dimensionally stable cable for transmitting uni~
form motion to a line space mechanism in response to a
ator 52 is cycled regardless of the position of the car
riage relative to the frame thereby effecting uniform
strokes of the pawl 26. The cable ‘42 may be made of
any suitable dimensionally stable ?exible material, such
50 as metal wire, nylon-linen cord, etc.; the choice being
dictated by the life requirements required or speci?ed.
It should be understood that the foregoing disclosure
relates to only a preferred embodiment of the invention
and that it is intended to cover all changes and modi
55 ?cations of the example of the invention herein chosen for
Other objects and many of the attendant advantages of
the purposes of the disclosure, which do not constitute
this invention will be readily appreciated as the same
departures from the spirit and scope of the invention.
becomes better understood by reference to the following
The invention claimed is:
detailed description when considered in connection with
1. In a typewriter or like machine having a carriage
the accompanying drawings in which like reference num
and a platen rotatably mounted on said carriage, an ele
erals designate like parts throughout the ?gures thereof
ment on said carriage adapted when actuated to rotatably
and wherein:
index said platen, a ?exible dimensionally stable taut
FIGURE 1 is a rear view showing line spacing mecha
cable secured to said element and to the carriage frame
nism in accordance with the invention.
FIGURE 2 is a cross sectional view taken along lines 65 structure, and means operable through a cycle for causing
a loop in said cable whereby said line spacing element
2-2 of FIGURE 1.
is actuated.
Referring now to the drawings wherein like reference
2. In a typewriter or like machine having a carriage
numerals represent like or corresponding parts through
out the views, there is shown in FIGURE 1 a carriage‘
and a platen rotatably mounted on said carriage, a line
generally designated by reference numeral 10, comprising 70 spacing element movably mounted on one end of said
spaced end plates 12 and 14 adapted to rotatably support
carriage, a ?exible dimensionally stable cable secured
a platen v16 which has provided on its right end, as viewed
to said line spacing element and to the other end of
uniform stimulus applied to said cable at any point along
its length.
said carriage, and means for forming a loop in said
cable thereby to move said line spacing element.
'3. In a business machine having a frame, a carriage
mounted .on said frame and a platen rotatably mounted
in said carriage, means for indexing said platen com
prising a ratchet, a pawl adapted to engage and drive
mounted on said frame and._a platen rotatably mounted
in said carriage, a ratchet secured to one end of said
platen, pawl means on the end of said carriage adjacent
said ratchet adapted when actuated to engage and drive
said ratchet whereby said platen may be rotatably 'in
dexed, a ?exible dimensionally stable cable tautly secured
between said pawl means and the other end of said
carriage, and cyclic means on said machine frame oper
able to de?ect said cable at any point between its ends
thereby to actuate said pawl means.
said ratchet, lever means .rotatably mounted on one end
of said carriage and adapted when rotated to drive said
pawl into engagement with said ratchet, a ?exible dimen
sionally stable taut cable secured atone end to said lever
means and at its other end to ‘the other end of said
carriage, and means including cyclically operable means
for forming a loop in said cable whereby said lever means
4. In a business machine having a frame, a carriage
References Cited in the ?le of this patent
Vidal _________________ __ July 2, 1907
Schneider ___________ __ Dec. 28, 1920
Без категории
Размер файла
267 Кб
Пожаловаться на содержимое документа