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Патент USA US3071782

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Jan. 1, 1963
Filed Sept. 1, 1959
5 Sheets-Sheet 1
Jan; 1, 1963
Filed Sept. 1, 1959
5 Sheets-Sheet 2
Jan. 1, 1963
c. R. A. JoHNsoN ETAL
Filed Sept. l, 1959
5 Sheets-Sheet 5
Jan. 1, 1963
c. R. A. JoHNsoN E'rAL
Filed sept. 1, 1959
5 sheets-sheet' 4
Jan- l, 1963
Filed Sept. 1, 1959
5 Sheets-Sheet 5
United States Patent ."Qíl?çe
.Patented Jan.n 1, M963ñ
-trating 'a number of'selected features including the man-`
ner in. which the chart may be withdrawn from the sup!
porting plate for inspectionof any selected length thereof;
Curtis R. A. Johnson, Flourtown, Richard Garvin,
Feasterville, Carl R. Ruppenthal, Erdenheim, Morris
Joseph, Philadelphia, and Paul B. Binder", North Wales,
îFlG.'9 is` an enlarged fractional sectional view of 'a
pressure-producing assemblyV associated with- the take-vr
_ up roll; ’and
Pa., assignors to Leeds and Northrup-Company, Phil
adelphia, Pa., a corporation of Pennsylvania
. FIG. l0 is a diagrammatic view showing the path yof
Filed Sept. 1, 1959, Ser. No. 837,415
the chart through- the instrument.
3 Claims. '(Cl. 346-68)
This invention relates to ‘improvements in' exhibiting
devices of thetype employing a strip chart together with
an associated' scale and' pen-index assembly for recording
-and indicating magnitudes of conditions runder measure
simultaneously magnitudes of`- two variables. Thus, the
lp_cn 11a forming a part of :a pen-assembly including an
index 11b records and indicates _the magnitude of a vari
vableas shown `on achart 135> byA the trace 14 and as ap#
precision instrumentlof unusually compact designkand
- pearing on the associated scale 15. Similarly, a pen 16a
which Vis adapted for th'e measurementofone or more
forming a part of a pen-index assembly including antin
quantities and for' recordingand indicating the magnitude
. .
vdex 16b produces a trace. 17 `on the chart'and an indi
, lt can readily be >understood that, as the size of instru-t
ments of the above character is decreased, there areprej
sented many difficulties in providing the desired‘rugged'
_ness-coupled with the needed precision. Morev particu
larly, with charts and associated'scales reduced :to the
cationof rthe magnitude> thereof on'the scale 18. The
chart 13- inElG. l moves downwardly and beneath a
f_tear-ofi bar 19.’ The chart’isdriven by atiming motor,
later todae described, by means _of pins 20a projecting
from a chart roll 2l).> through circular openings ofthe
. _order ,of four inches in contrast with the larger instru~ '
` It it be'desired to remove a‘section of the char-tfrom
i 'the instrument, a chart-liftingileverv 21 is grasped near
ments with charts ten inches wide, itis necess'aiy- to’de
part from conventional practice in" the assembly of the
'the lower‘end' and pulled outwardly. " This pulls a length
of chart Vfrom the take-up roll'f With a -length of- the
cha'rtfthus.pulled` forward, the fingers may be inserted
behindv the chart to‘ pull- from the rolls any selected
4length. Thus »the past record may be pulled below the
various lcomponents forming the instrument.` Though
the above considerations have been important to the
instrument of the present invention, nevertheless theLfea
tures hereafter to be explained in detail have advantages
regardless of the size of the instrument.
l `
exhibiting instrumentltl of the X~-X type, that is` to
say, one in which there may be indicated and recordedl
y, It is`_an object of the present .inventionl to >provide a
of such quantities.>
A‘ Referring to the drawings, particularly FIG. 1,'thev
invention has been shown in onefor-mïas applied to an
" ` .
tear-oit bar`19 to sever it intok the pattern _of the bar.
in carrying out the present invention in one form, the
l_Thisprovides the upper part of the chart with a sym
metrically 'shaped 'end having a leading center portion
strip-chart assembly for the recorder „is supported from
a vertically extending main frame slideably carriedy by
and angularly extending-side portions. This shape facili-1
a housing and from which frame extends in cantilever
fashion the whole of the operating mechanism.. This
vtates the' threading of the chart. '
"_'Th'e chart-lifting lever 21 is Vinthe form of a round
mechanism'includes -the supply and take«up rolls ’_for
Íwire memberv generally of U-shape and with outwardly
the chart, one or more `pen assemblies each of a design
’extending e'nd portions 21a andw21b which extend through
particularly adapted to the instrument ’of the present in
openings Ain _a mainframe member '29 and a sub-frame
vention and including a pair of conical bearings support
24.v The lower cross bar of the U-shaped ‘pull-out mem
ed between the arms in a U-shaped end of a frame, the
ber 21"extends toward the rear of Vthe instrument as
pen~bearing member having extending therefrom spring
_viewed in FIG. l so thatV it nests beneath a back-up plate
wire elements, one spring wire being disposed on one 45 26 disposed directly behind the chart and thus the cross
side and the other on .the other sideof the bracket mem
ber normally to bias the pen-carrying element in a pre»
determined position and _for appl-ying to the pen a pre
determined force when the4 pen is moved into engage
The chart
a wholepath ofis the
chart. within
hou-sing 28, being supported therein in cantileverï~'fas`hion
`from kthe vertically' extending main frame member' 29.
ment with the chart.
.As Will be later explained in` detail, all 'partsof the asL
For further ,objects> and advantages of the invention
'sembly are carried by this >single mainframe ¿member
and for detailed descriptionsof other'useful» and »novel ' kw ,29 though vthere is secured 'to it ithe sub-frame 24, FIG-8,
features, reference is to ybe had rto vthe following descrip
which. has a down-turnedfenfd 24a, which with» the re
tion taken yin conjunction with. the accompanying draw- v
ings in which:
55 corder in its housing 28 re'sts upon a part of `the housing.
llt will be noted> that the chart back-up plate 26 is inte
FIG. l is a front viewof the instrument` with the cover
»gral with thesub-frame 24, the parts being vconnected
y‘the right angle >bend therebetween.
FIG. 2 is a fractional plan
view of the instrument with
The 'instrument 10, FIG. l, may be utilized 1alone or
« 'the housing omitted;
K .together with a control-point setter. Where the 'control
FlG. 3 is a sectional »side view taken on Ithe line 3-3 60 ,point setter is included, -it will‘have associated therewith
of FIG. 2‘ of the upper por-tion of therecorder butwith .
an` index 31. Thus the index- 31 may, by suitablemeans
such as a gear '32,_be moved to a selected position along
FIG. 4 isa side elevation taken in the direction of the
ithe scale I8 to indicate the magnitude of the condition
both pens in view;
, i
FIG. 5 is jan isometric viewv of one of the pen-assem
blies-and associated supporting members;l ~
.to be maintained by ,a controller. ',In the illustration of
iiledSeptember 1, 1959, now Patent`2,980,876.
ï Referring now. to FIGS, 2, 3_and 5, it will be seen that
the `index 11b is the pointed down-turned end of al mein
FIG. 6 is an isometric yviewofanother of` the pen~
assemblies partly in section togetherwithits supporting
- FIG. 7 is an isometric view_of the-jchart-supporting and
FIG; 1,> there has _not been utilizedy the'control feature
just described.> The control~point setter forms the subject
ymatter of a co-pending _application Serial No. 837,412.,
t driving rollers, the` chart having been jomitted;
-`ber 11ml which'is spot vwelded or otherwise secured to-a
FIG.l 8 is an isometric view of selected partsillus- Si pivoted support 33. This support orl bearing memberßß
To this extension 52a there is pivotally secured a mem
has conical ends nesting within two openings of a pair
ber 16, the V11p-turned portion 1‘6b of'which forms _the .
be noted that beyond the
above-described index. Itwill
pivot pin 54 the member 16 has a dimple 16d, FIGS. 2,
forming the support for the bearing member 33. Extend
ing> rearwardly from bearingnmem-ber 33 are a pair of "il .3 and 6, which is arranged to .rest within a slot 52b, FIG.
of resilient arms 34a and 3ï4b formed of athin channel
shaped sheet metal member 35, the narrow sides thereof
2,> tomaintain the‘memb'e'rlö
springmembers 3'6 and 3'73which are ,preferably formed
alignmentwith the pen
16a during measurement operations. In FIG. 2 themem
of a U-„shaped piece of spring wire passed through holes
in member 33 and‘suitably secured as by cementing ,the
Iber 16 isfsho-wn swung to the left to expose the pen which ‘ ‘
from time to time may be removed for cleaning. y
bottom of the U to member 33. Each spring member
extends into overlapping relation with the web portion 10 The driving cord 56 for the carriage including channel
member 35m is threaded over pulleys 57 vand 58, being
of channel mem-ber 35„one member 36 being disposed
secured tothe carriage by a clamping member 59 in the
on the upper surface of the web portion of member 35
same manner as described for the Vclamping member 50.
_and the other member‘37 being disposed ,adjacent the
It is to «be further observed in FIG. 6 that the lowerguide
lower surface of the web portion. The upper and lower
surfaces of channel 35 are provided respectively with 15 rods 46 land> 61 for the respectivecarriages of the asâeln'
respectively Vto receive the spring membersl 36 and 37,
bly including Apen 16a and theassembly including pen
11a, FIG. 3, are secured between end members 62a, 62h,
phere. The channel-shaped member 35 is carried b`y a
arcuatelyîsha'ped spring 64 is secured to an up-'standing
indentations or recesses 35a and 35b which are adapted
of a frame the intermediate portion 62c of which is cutV
FIG. 5. In this manner the index 11b and pivoted mem-`
away inFIG. 6. The subassembly including the lower
ber 33 are biased to a fixed and predetermined position
with _respect to the pen carriage. More importantly, the 20 guide rods 46 and 61 is pivoted on >’the upper rod_43fin
order lthat the pens may be lifted from the recording
‘ penK 11d is likewise `biased to a fixed position inasmuch
paper when desired..- The normal 'position for the sub
as the pen itself is formed by a capillary tube extending
through and secured to the pivotcd member 33. Ink is Y assembly will be with thepens engaging 'the "recording
paper. To provide downward or counterclockwise move
fed to the capillary tube and to the pen 11a by way of
nient o_f the subasse‘mbly as' viewed in FIG. 6, for auto
plastic tubing 38 which extends downwardly into an ink
matically restoring the lifted pens to normal position, an
reservoir ,40 having till and vent holes’41 open to atmos
arm of side member 62h. The arcuate spring 64 is ar
y ranged tobe displaced by engagement with a pin V63 on
bracket 42, itself pivotally 'and slideably mounted on va
rod 43 which isnconnected to frame members29 and'24.
The Ábracket 42 is provided with elements 44 which are
spot welded to the web of Vchannel member 35. The ink
side wall of housing 28, FIG. 6, when the assembly is slid
into operating position inthe housing `28 as viewed‘in - ` '
reservoir 40 is supported‘from a depending end, FIG. 3,
FIG. f1.
of `bracket; member 42. The ink reservoir 40`is provided , ,
' The upper rod 43 and its counter part
are rigidly secured to the main 'frame member
6s, FIGS.
29 2and
4, I '
through a similarly-shaped opening,lFIG. 5, in the down 35 subframe 24. This subframe 24 includes the `chartmsup- '
porting or back-up plate 26. The subframe member 24
tur-ned portion of bracket 42. The` triangular-Shaped ex
is supported from the main frame' member 29 >by means
tension 40dy has overhanging edges so as to interlock-with
with’a triangular-shaped extension 40d which extends
of lthe upper rods 43, 65 and a rod 68 bolted or rigidly
the triangular-shaped notch inthel down-turned portion -
of thebracket 42. In order to predetermine the position
of the carriage of the pen-index assembly, that is* to say,
the position in a substantially horizontal plane of the
channel-shaped member 35, the down-turned portion of
bracket 42 is provided with an adjustable plate 45 having
._a bifurcated endwhich is slideahle with respect to a pen
lifter` guide rod 46.. By loosening the screws there may
be relatively’adjusted the Ibracket 42 and the plate 45 to
produce proper orientation of the parts.
secured to main frame member 29 and' subframe mem
40 ber 24.`
to both members. rIrhe rods 68, 70, and 71 act aslguides
fori'the chart. ’To provide additional `bracing forlfth'e
subfr'ame member V24, there is secured thereto a bracket
. ‘72, FIG. 2, `whi`ch extends angularly toward and is secured
to a bracket (not shown) fastened to the ‘main frame
member 29 (at a point not shown).
ber 35, FIG. 2, is translated by means of a driving cord
47 driven by a balancing motor, not shown, and threaded
over `pulleys 348 `and 49, the driving cord 47 being secured
>shown pivoted on the rod 43 as explained above.
cooperative -relation ‘with a spring-‘wire member 73, FIG.
4, ‘secured to .subframe 24 by screws 74. Y The upper end
of. the spring member73 is preferably provided with sev
eral notches. The lower notch on which-the extension
62d is' resting >seryesto bias the carriage assemblies down
4‘system may be of the» type shown in.Williams"Patent
2,113,164 >or inWilliams’ Patent 2,367,746. v
l The pen-assembly, so far described, including the index
11b may -be utilized alone and without >the needof a sec
wardly.> However by lifting' on the extension‘óZd, Ythe i
ond pen-index assembly for indicating and recordingjthe v l
¿shown attheright relative to the assemblyshown ‘atthe
kleft _so _that they ,may pass eachother,- it will be noted,
particularly, in FIG. A3, `that themchannelmember 35m is
located at a lower level than `the_correspo`ndin'g member
35. 0n theo‘therA hand, the index‘16bl is -located above
member 62bl has an outward extension .62d 'arranged in
to bracket. 4t2-- by a clamping member 50> and associated
screw. The driving motor and the associated measuring
ingNme/mber 35 of the pen assembly Vshown at the left in
2. ' In order to provideclearance for the, assembly
Y' Referring now to' FIGS. 4‘and 6, it will be 'observed
that lthe subas‘sembly including the side member 62h is
The carriage including `bracket 42 and channel mem
magnitudes of av variabler condition. However, ,the ex
hibiting instrument of the ,present invention lends itself
`to ¿the ,inclusion of the second pen assemb1y`,UFIG; >2,
vincluding index -`1f6rb andthe associated ,pen 16a. In FIGS.
Y¿and 3, Vit may: be observed that the parts are 'of quite
-similaryconstruction the principal difference b'e'ingthat
,the channelmember 35m is shorter than the correspond
Also assisting in the support of member 24 from `
member Á29 are rods 70 and71 which are rigidly secured -
assemblies mayy belifted upwardlyg‘the extension- 62d fthefn
resting in the upper notch'to hold the assemblies'ingtliel
raised'p‘osition with the pens 16a and 11a in spaced rela,
tion to the chart drive roll 20.
Referring'now to FIGS. 4'andV 7, the chart-supply roll ,
80 is carried on a stationary rodV 81, FIG. 7, which 'is
,cantilever-‘supported `from t'he‘maintrame 29. 'On‘ the
65 stationary rod 8`1'near the frame 29, there is rotatably
mounted a flange sleeve 82 having outwardly bent spring
elements 82a ‘ for engagement `with the hard core on
which the chart is wound. Thel outerl end of rod 81 has
'an enlarged cylindrical >end 81b on which the cylindrical
70 hard core of the supply >roll 8'0 `may rotate'.v “It will be „
observed that the `end of-rod 81>is threaded to receive a
A»fastening .screw '83, `FIG. 4, arranged to hold in place an i .
arm `or bracket 84,1pivotally carried on a shoulderof rod
theindex _.1`1`b. `This isïaccoinplished‘by means of a` " 71.
Intermediate the‘jends ofthe arm 184 is a pressure
„bra'e'ket sa which .extends behind the».> ink, reservoir 4o
and upwardly terminating ina ii'at bracket 'extension 52a.
assembly lcon'lprisinga disc 85, FIGS$4 and 9,;nor'r`ually `
biased away from arm 84 by a series of spring, spoke
like, elements 86. The re-wind roll for the chart is formed
b_y a fibre cylindrical core 83, FIG. 9, having a .slot 88a,
FIG.V 7, arranged to receive a driving lug 89 carried
rangement lends itself to use with other components which
may be included within or outside of the housing 28.
Since the main frame 29 provides the sole support, it will
be understood that the brackets 98 and 99 may be located
by a flange sleeve 90 which is rotatably mounted on a 5 at any desired position on the side wall of housing 28, thus
tixed stud shaft 91 supported in cantilever fashion from
to leave room for other rsubassemblies to be located be~
main frame 29. The flange sleeve 90 is driven by a belt
low or above the recording instrument above described in
92 from a drive pulley 93 which is secured `to a gear 94
detail. Similarly, by locating as many parts as possible
meshing with a drive gear 95 and which through suitable
on and adjacent the upright main frame member 29, room
reduction gearing is driven by a timing motor 96. The 10 is provided in the housing 28 for other components which
driving gear 95 also drives a gear 97 which serves to
may in similar manner be slid from the opposite end and/
drive the chart-drive roll 20 carrying the drive pins 20a.
or side of the housing on a second upright plate similar
There has been shown in FIG. l0 the manner in which
to the plate 29.
the chart 13 is threaded from supply roll 80 downwardly
It is to be understood that this invention is not limited
and across rod 68, thence upwardly across the guide 15 to the specific invention shown and'that changes and modi
plate 62o, which through its reverse curvature, guides and
ñcations may be made within the scope of the appended
holds the chart 13 adjacent the chart-driving roll 20. The
chart then extends downwardly along the front of the
What is claimed is:
back-up plate 26 across the rod below and across the rod
1. In a strip-chart recorder including a chart supply
70, and it is guided by the rod 71 to the take-up or re 20 roll, a take-up roll, and a drive roll, the subcombination
wind roll 88. The pressure disc 85, FIG. 9, is pressed
comprising marker means for the chart including a capil
toward the outer end of the fibre core 88. The core 88
lary tube one end of which is adapted to engage the chart,
is of a length slightly less than the width of the chart,
said capillary tube being rigidly secured to a pivotal sup
so that there is assurance that the pressure plate or disc
porting element having its opposite ends provided with
85 will engage the chart as it is wound on the re-wind 25 bearings, a carriage having arms adapted to receive said
roll and hold the further edge thereof against the flange
bearing ends of said supporting element rotatably to
of sleeve 90. This is desirable to produce a neatly rolled
mount said capillary tube on said carriage, said carriage
chart when re-winding. The re-wind roll 88 is driven as
having an intermediate portion disposed between said
by belt 92, FIG. 7, which may be a coil spring riding on
arms, said intermediate portion having retaining structure
metal pulleys for establishment of a limited amount of 30 disposed respectively on opposite surfaces thereof, and re
torque on the take-up roll 88. This provides an over
silient members secured to said supporting element and
drive, that is to say, provides a speed of rotation for the
normally disposed one on one side and the other on the
core 88 great enough to maintain the chart taut and pro
vide additional slippage as the diameter of the chart on he
opposite side of said intermediate portion of said carriage
and engaging said retaining structure to bias said capillary
take-up roll increases.
35 tube in a predetermined position relative to said carriage,
As explained in connection with FIG. 1, and as shown
said resilient members allowing relative movement be
in FIG. 8, the vertically disposed main frame 29 is adapted
tween said capillary tube and said carriage as said capil
to be slid into the housing 28 which is provided with
lary tube is moved into engagement with the chart.
guide brackets 98 and 99 to hold frame 29 snugly against
2. In a strip-chart recorder including a frame, said
a side wall of the housing. For ease in removing the 40 frame having means for supporting thereon a supply roll,
-indicating instrument from the housing, there is provided
a take-up roll, and a drive roll for a chart, the subcom
a handle 23 which has a lower arm 23a extending through
bination of a marker assembly including marker means
the rods 70 and 71 and an upper arm 23b extending
engageable With the chart to provide a record thereon, a
through an inturned ear on mainframe 29. The inner
carriage for supporting said marker assembly, means ex
ends of members 23a and 23b are threaded to receive 45 tending transversely of the chart for pivotally and slide
nuts which engage respectively the inturned ear and the
ably supporting said carriage, means including a swing
rod 71 for withdrawal of the instrument from the hous
ing 28. During normal use, the pull handle 23 is pushed
inwardly and is concealed behind a door (not shown) by
able frame for rotating said carriage and thereby the
marker means of said marker assembly into and out of
engagement with the chart, a housing for said recorder,
reason of the outwardly olfset intermediate portion as 50 means for supporting said frame for slideable movement
illustrated in FIG. 8.
of said recorder into and out of said housing, and means
The manner in which the chart pull-out rod 21. disap
supported by said housing and coacting with said swing
pears during normal use is best shown in FIG. 8. It
able frame to move said carriage and thereby move said
will be observed that the inturned intermediate section
marker means into engagement with said chart upon
is disposed to lie in the space between the lower end of 55
movement of said recorder into said housing.
the chart back-up plate 26 and the chart guide rod 70.
3. In a strip-chart recorder including a frame, said
In this connection it is to be noted that the lower por
frame having means for supporting thereon a supply roll,
tions of the rod 21 are bent outwardly from the backup
a take-up roll, and a drive roll for a chart, the subcom
plate 26 for ease in grasping it to move the chart outward
ly from the back-up plate. 'I‘he re-winding roll 88 will 60 bination of marker means for said chart rigidly secured
to a supporting element having bearing means, a carriage
permit adequate slippage of the chart to provide the nec~
adapted to receive said bearing means of said supporting
essary slack, and it likewise can be pulled from the supply
element to mount said marker means for rotation about
roll 80. In this manner, there may be easily selected the
a horizontal axis, resilient members secured to said ele
lengths of chart to be inspected or to be removed from
the instrument in the manner already >set forth in con 65 ment and normally disposed one on one side and the other
on the opposite side of a portion of Said carriage to bias
nection with the tear-off bar 19, shown in FIG. l.
said marker means in a predetermined position relative to
By reason of the several features heretofore discussed
at some length, there has been produced an exhibiting
said carriage, means extending transversely of the chart
instrument unusually compact, reliable in operation, and
for slideably and pivotally supporting said carriage, and
capable of high precision in the measurement, control, 70 means rotatable about a horizontal axis to move said car
indication, and recording of the magnitudes of one orV
more conditions. By providing the main frame 29 for
the cantilever support of all of the principal component
riage about said pivotal supporting means thereby to move
said marker means relative to the chart, said resilient
members limiting movement of said marker means about
parts, including the driving motors (not shown), the ar~ 75 the horizontal axis of its supporting element lbearing
means to permit raising and lowering said marker means
from and into contact with the chart.
References Cited in the ñle of this _patent
1,690,517 `
Wilson et a1 _______ _.'_.__"__ Nov. 6, 1928
Blanchard ___ ___________ __ Mar. 1, 1932
Brown '.__`_> ___________ __ Aug. 13,' 1940
Caldwell ____________ _,__ Nov.l 18, 1952
,2,655,426 .
' 2,663,609
Massa _______ __`__`___'___ Apr. 12, 1960
France ____ __»..____,_`____„> Oct;
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