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July 13, 1950
Filed Dec. 17, 1946
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4013428 5255M
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Patented July 18, 1950
William G. H. Finch, Newton, Conn, and Gott
fried H. Hohmann, Bronx, N. Y., assignors, by
mesne assignments, to Pierce Company, Provi
dence, R. I.
Application December 17, 1946, Serial No. ‘716,774
1 Claim. ( Cl. 346-101)
Our present invention relates to facsimile scan
ning devices and more particularly to facsimile
Another object of our invention is the provision
of novel supporting means whereby a stiff blade
may ‘be resiliently mounted with respect to a
helical Scanning system so that the blade will
scanning devices of the type utilizing a knife
edge or blade cooperating with a bead or wire
helically arranged on a drum.
The type of scanning operation for which my
invention is designed is thus of the general char
at all times maintain perfect contact with the
helical scanning bead at every position thereof
without bending or ?exing in order to maintain
such contact.
The foregoing and many other objects of our
invention will become apparent in the following
descriptions and drawings in which
acter shown in the application Serial No. 554,427,
now Patent No. 2,413,962, issued January '7, 1947.
Our present invention relates primarily to the
forms and support of the knife blade itself so
that it may readily be mounted, adjusted, and
Figure 1 is a top view of a portion of a facsimile
replaced in the machine and so that it will always
engage the helical bead properly to make a
perfect impression.
Herétofore in the construction and operation
of helical recorders utilizing a knife blade en
Figure 2 is a side view of the portion of the
facsimile recorder of Figure 1 taken from line
2-—2 of Figure 1.
Figure 3 is a cross-sectional view taken on line
3-3 of Figure 1 looking in the direction of the
gaging a helical bead on a drum, various attempts
have been made to obtain the proper recording
pressure and engagement. The greatest diffi 20
culty which arises is the necessity for having an
extremely light blade so that ordinary springs
ll-—4 of Figure 1 looking in the direction of the
may readily retain the same in engagement with
the helical head at all points of contact and where
the inertia of the blade itself will not prevent
the springs from constantly maintaining such
ing the knife blade in place.
Figure 6 is a view corresponding essentially to
that of Figure 1 showing a slightly modi?ed
method for supporting the knife blade in position.
Figure 5 is a top view taken from line 5-5
of Figure 1 showing a modi?ed means for clamp
contacts. Also, such difficulties have arisen from
the fact that where extremely light blades were
used, they tended to be ?exible and, therefore,
bent around the bead itself thereby thickening ,
the recording line unnecessarily.
Where a very thin blade was used, relying on
Figure 8 is a modi?ed view of an alternative
knife blade support.
the blade caused the blade to bow out so that the _.
recording line instead of being a straight line on
the paper was a bowed line, and the recording
theless, the blade as a whole acts as a single stiff
Figure 9 is a cross-sectional view taken on line
9 taken on Figure 8 looking in the direction of
the arrows.
operation was performed not by the edge of the
blade but rather by the side of the edge of the
blade at the center of the blade and by the edge
of the blade itself at the two ends of the blade.
This, apart from interfering with the clarity
of the recording, tended quickly to crystallize
and destroy the blade itself. An object of our
invention is the provision of a novel knife blade
for a helical scanning system wherein the knife
blade may readily be made rigid and wherein the
construction of the elements lends itself to rigidi
Another object of our invention is the provision 50
of novel mounting means for the knife blade in
Figure 'l is an end view of the modi?cation of
Figure 6 showing the support in greater detail.
the width of the blade for stiffness, the blade
nevertheless tended to bend and this bending of
the helical scanning system whereby the knife
blade itself is resiliently mounted while, never
Figure 4 is a cross-sectional view taken on line
Referring now to Figures 1, 2, 3, and 4 our
novel recording system comprises a knife Ill
preferably of a Z-shaped form having a main
portion H and blade elements, [2, I2. Either of
the blade elements l2 may be mounted in the
support so as to cooperate with the bead E5 on
the drum I6.
The method of operation is then generally in
accordance with the principles set forth in ap
plication Serial No. 554,427.
As above pointed out, however, it is necessary
that the blade be made as rigid as possible while,
nevertheless, it be resiliently mounted so that
it may press against the bead l5 at every posi
tion of the bead. This has been a real problem
in facsimile recording because the point of con
tact with the bead moves rapidly from one end
of the blade to the other.
In a recording done at 100 lines per inch and
one inch per minute at this point of contact thus
moves across the knife blade from one end to
the other 100 times a minute. Accordingly, the
blade must be light; it must be rigid, and the
supporting means must be such as to maintain
even contact at every point.
For this purpose my novel blade in is mounted
in a novel support 20, which support in turn is
carried in any appropriate manner as by the
screws 2| on a cross bar 22 which in turn is‘
carried on a frame member 23,1~.the¢saidxframe
member 23 being pivotally supported at pivots 28
so that the entire assembly, ‘including .;the1knife
that the rigidity obtained by the bends at 40
and 4| is imparted to the blade itself.
Thus, in a practical commercial device, each
of the blade elements l2 and 12a is one eighth of
an inch high, while the base portion II is ap
proximately one half an inch wide and the gauge
of metal‘ which is su?iciently-small :to be con
sistent with markings of 100 lines to an inch.
It will be obvious that many modi?cations of
the basic principles herein disclosed may be used.
v"Where additional rigidity is required even though
the conformationof the blade produces all the
‘rigidity that .should‘ be necessary, additional ri
_.gidifying pieces; 5B§may be secured in any suit
blade, may be swung out of the engagement with
the drum 16 to permit the changing of blades Ill 15 able manner as by brazing or welding to the
opposite side of the base member I! of the knife
and the loading or adjustment of the machine.
l0,fthe' said rigidifying strips being so arranged
The support 20 is provided with a pair of
threaded openings 22, 22 adjacent the ends of vthe
support with said openings being directed toward
the? knife blade. The openings. 22.:are threaded
‘that they- will not interfere with the operation
and receive .the screws 23, , 23,'_which screws may
dotted lines since for all ordinary applications
be adjusted either by a screw driver enteringthe
slot-24 or- may be adjusted by a socket wrench
they are not necessary. The conformation of the
the‘reentrant ?ange 38 on one side, the body por
In Figures 6 .and '7, we have shown a modi?ed
form of .securement .and supportfor any blade.
The blade I. ll); vhere shown has substantially the
constructionof blade.‘ [0 of Figures .1 to.5. This
of the spring 26 as shown.
.These . ,rigidifying , strips
56 are -indicated 1 .in '
blade provides sufficient rigidity. 'It will also be
obvious that the blade elements I2 and 120,. may
wherenthe ends of the screws are- squared off.
'lTl'lG'SCI‘GWS 23 carry-at'the- end thereof the 25 be formed to enhance their rigidity. Thus, they
may be longitudinally corrugatedor they may be
springs. 26,~25~>which emerge from the openings
made partially‘ tubular in form, or they may be
22 and bear against the under surface of the
given an I-beambross-section with one of the
main body portion‘ H 1of the knife blade» 15, thus
legs of the I being extended .to form the blade or
biasing ‘the knife blade iii and» its: scanning edge
l2 against the bead-i5. The'support?ll- isralso 30 additional rigidifying strips or tubes may be se
cured to .theblade elements l2 and i 2a.
provided with the notch. 28in which the blade
Also, it will be obvious that. the retainer mem
portion l2a, which is not used for-scanning pur
bers 30 with'their reentrant flanges 38 need not
poses at the time, rests.
necessarily‘ be individual pieces as shown vbut
:Thewsupport also is‘ provided“ with? the- retain
ing-.memberst?d, 38 ‘which are "held :in ‘position 35 may be a continuous strip extending along the
entire support. Also, in addition to the. support
on the threaded bolts 3! by operringsf?rthere
means shown in Figures 1 to 4, the blade may
in i. ‘which ' rest on" the said vbolts. The ‘retaining
be further supported‘by a clamp member which
members" 30 may be‘ tightened" in: retaining- posi
is. rotatable 5i entering the slot 52, the said ro~
tion by the knurled nut 33 threaded on the‘bolt
tatable member 5! being rotatably mounted on
3|~and encasing' the ‘body portion 350i each-‘re
the stud 53 in the support 20.
taining member 38 betweenithe nut’: and; the side
The‘ conformation of the rotatable member 5!
of the support 20.
permits the slot 52in the blade. Ida to be slipped
"Two- such retaining members'tll are used. ' The
therefrom, and thenthe rotatable member 5!
said retaining members each have a reentrant
may be rotated to clamp the blade “la in posi
?ange 38 extending over 'the>notch"28. 'The blade
tion. This is preferably \usedinconnection with
10 may‘thus be readily mounted in- position by
the securingelement shown in-Figures .l .to ll,
being slid in from the end. ‘The blade element
although this form of .securement may be used
In is slid into the end of the notch‘ 28,while ~the
place of the retaining membersttnf Figures
shoulder‘d? between theblade-element ‘12a and
the main body I! of the bladev it‘ is "slid under 50 1’ to 4.
tion ll of the blade being at‘; theJsame time slid
over the end of thespringZB which is pushed
down for this purpose.
The entire blade I0 is then slid over until the 55 blade, however, is..provided .withtheextending
pin»! l I at all four corners.
end thereof reaches the‘opposite retaining ‘mem
The support I20 has substantially the . form
ber 38,- at which time the shoulder‘ 443 is slidun
previously descri-bedin connection-with support
der'the: ?ange 38 on that side and the body :por
20 of Figures v1 to 5, but the supportv I20 does
tion H is slid over the spring'26'on that’side.
have a notch nor does it have retaining mem
The blade‘ I0 is thus mounted in position where
bers 30. The support I28 is,.however,.provided
the springs 26 bias the same towardthe drum
with springs IZB-which operate in the same man
so that the blade portion l2 contacts the‘bead I5
as previously described.
of the drum. ‘The‘reentrant‘flange'tfi of the re
The elements which mount. the knife bladev i It
taining members '30 prevents‘ the ‘blade Hi from 05
on the support I29 are the sidesecurement mem
being pushed out of the support.
bers llll which are secured .to theends of :the
At the same time, the bead it pushes the blade
support I20 by screws I02. The securementmem
portion 62 of the knife member Ill backaga'inst
bers IOI have upstanding legs Hi3 and I84. Leg
the support‘zt, this force being resisted by the
I03 is provided with an opening M5 to receive
springs 2fiwhich thus bias the blade portion E2 70 the pin HI in such manner that the blade H5 is
of the knife *member it) against the bead £5.
pivotally supported at the edge of the blade mem
The construction of the knife member i0 is such
ber H0 opposite the knife edge H2.
as to rigidify' the same ‘against. bending or how
By providing the pins III at all four corners
ing. The blade elements I'Zare. made extremely
of the blade member I l D, it is possible to. reverse
short with respect to the main‘ body portion so
the blade when one of the blade elements is
worn out. Leg I04 is provided with the reentrant
?ange I06; the two reentrant flanges at each end
of the support I20 thus prevent the blade mem
ber I I0 from being forced entirely out of position
by the springs I26 and limit the movement of the
the support and the base 202 of the support and
the main section II of the blade I0 extending in
surface-to-surface engagement with the face 20I
of the support and being held in engagement
therewith by the springs 2I0.
By this means, therefore, a simpli?ed support
blade member H0 in response to the springs I26.
is provided in a one-piece construction which
Flanges I06 are so proportioned, however, that
permits the blade I0 to be slidably inserted and
the bead of the drum when it bears against the
removed, reversed and replaced. The curve at
blade or edge I I2 of the blade member I I0 forces
the member I I0 against the springs I26 and away 10 2I2 of the springs 2I0 permits this sliding action
to occur without any manipulation of any kind
from the ?anges I06. It will, thus, be seen that
whatever, and the supporting member is of simple
in order to mount the blade member I I0 in posi
construction and formation. The support mem
tion, it is necessary to loosen the screw I02 suf
her 220 may have any suitable piece of insulating
ficiently to permit the pins III to be introduced
into the opposite holes I05 and then to tighten 15 material secured thereto in any appropriate man
ner in order to facilitate the mounting of the sup
the screw I02. This need merely be done on one
port and blade I0 which it carries on the frame
The form of Figures 6 and 7 thus requires a
or any other portion of the facsimile recorder.
slight degree of manipulation in order to mount
In the foregoing, we have described our inven
' or replace a knife blade and also requires that 20 tion only in connection with a speci?c preferred
embodiment thereof. Many variations and
pins III be soldered or otherwise secured to the
modifications of our invention should now be
knife blade. However, the construction thereof
is simple and operative although the construction
obvious to those skilled in the art. Accordingly,
we prefer to be bound not by the speci?c dis
of Figures 1 to 4 is preferred.
In Figures 8 and 9 I have shown a still further 25 closures herein contained, but only by the ap
modi?ed and preferred form of knife blade
mounting. The blade here used iS identical with
the blade I0 of Figures 1 to 4.
A mounting support 220 is an angularly bent
metallic member having a face 20I, a base 202,
and an opposite vertical member 203, the three
pended claim.
We claim:
In a facsimile receiver comprising a scanning
system including a rotatable drum; a helical
bead on said drum; a printing bar engaging said
bead; said printing bar extending longitudinally
elements, 20I, 202, and 203, forming a U-shaped
of said drum parallel to the axis thereof and
having a substantially Z-shaped cross section;
channel-like construction.
the longitudinal elements forming the top and
A retaining panel 204 is bent up at 205 from
the element 203 and is so arranged that its edge 35 bottom of the 2 being of the order of one-eighth
inch in width and the longitudinal element form
206 terminates adjacent the end 201 between
ing the main body of the Z being of the order of
elements 20I and 202 of the channel-like sup
one-half inch in width.
port 220. Leaf spring members 2I0, 210 are
mounted in suitable supports 2H, 2“ in the
section 203 of the support member 220. The said 40
leaf springs may simply consist of screened wire,
one end of the spring being caught in one of the
supports 2“ and being slidable with respect to
The following references are of record in the
the other.
?le of this patent:
The upper loops 2I2, 2I2 of the springs 2I0 45
project outwardly through the slots 2I5 in the
retaining member 204 to bear against the back
Shankweiler ____ __ Dec. 31, 1940
of the support element 2!". It will thus be seen
Ressler __________ __ July 31, 1945
that the blade I0 may be slid into the support
Finch ___________ __ Jan. 7, 1947
element 220 from the side, the leg I2a thereof 60 2,413,962
entering between the edge 206 of section 204 of
Young __________ __ Feb. 4, 1947
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