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Патент USA US2130373

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Sept. 20., 1938.
2,130,373
J. L. ANDERSON
TEMPLATE FOLLOWER
Filed July 10, 1937
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215 ‘
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INVENTQR
A ‘
7
V
ATTORNEY
Patented Sept. 20, 1938
2,130,373;
STATE-Si‘ PATIENT" 6F I‘ZCJEZI
2,130,373 I
TEIVIPIJATE 'FOLLOWER.v -
James L. Anderson‘pclosteni N. J., assignor to‘
Air‘LReduction Company, Incorporated, I New‘
York, > N -. Y.-, a corporation of New-York '. '
Application-July 10, 1937, Serial No. 152,958
17-- Claims; \ (Cl.:33—23)
inventionrelates to‘ terrip’l'ateefollowers.
It*‘i's“an“obj'ec't of the invention'to. provide an"
improved‘;template-followerv ‘which’ automatically
follows"‘ternplates'~ of ‘irregular .shape' including
5 curves-"of rela't‘ively' "short" radii. The invention
comprises‘novelrfeatures"and combinations of" ele
ments which? make the’ template-follower simple
and‘5-‘econ‘oinical to“ manufactureand convenient
to use.‘
10 - In‘ia'cc’ordance’with onefeatur'e of the‘invention
a follower roller’oiran‘inclined‘ axis rests on the
than the rack so that ‘the sleeve can move up
and downa ,A pinion, 2d,. on an axle 22 rotated,
by a hand‘éwliee'l' 23',l‘m“eshes‘ With? the rack ‘ I T and
serves‘ to" lower‘aridf raise thesleev'e I51 when
the'template-fcnower ist'o‘ be‘ moved into or out.
of Contact withia template. The upper part of‘
the ‘ t'e'mp‘la'te-follcrv've'r~ is‘ similar to’ known tracers
and aidesc‘ript'ioniof it‘is'not necessary'fora c'om
plet'ei understanding‘ of this" invention; Tracers
of suchfconstru’cti'onlar'e'z‘shown in Patent No‘.
2,059,755; dated November“ 3, 1'936;.and Patent
top? face-of‘ a-templat'e and’ is‘rdriven to cause it . N0.
1,999,‘85'5,"dated’ April‘ 30, ‘193.5.
to travell ‘along’ thetemplate; and‘guide means
The
lower end of the sleeve i5 is of ‘reduced?
are-provided"fori'causing the" follower roller to
' stay*~on=' me~~ to‘p_—_ face" ‘of 1 the‘ template around
curves-in either‘direction‘ as well°as along straight
run'sé ; Another ‘ objectof ' the‘invention" is~ to‘ pre
vent5 the guide“ means‘ from' binding against the
side's'so'fet e"=tem'plate"o_n"sharp curves.
20
Othe'rl‘oh ct's,*fea'tnres ‘and advantages ‘of the
invention‘will3 appear 'ori-b’ewpointe'd out as the
speei?cation1= proceeds.’ ~
In‘? the accompanying‘drawing', forming part
vFig;- 1L i'sias'ectibnal» view of ‘ a template-‘follower
emliiodtiihghthe inventionrj ‘c
"is? an elevation‘ of thelower‘part of the
surface of the'sl'e'evei l'5“which s'lides'in the bear
ing'l'lv'ij During" operation" of the‘ template-fol
lower‘thesle'evejl‘5=and"frame M are’ free to move
up andido'wn with a’flo‘atin‘g'action'inresponse'to
any‘irregulariti‘es in‘ the supporting‘ surface along
' whi'ch‘th‘e template=follower runs?‘
templatee-follower‘ of'lFig‘. 1‘, looking toward the"
A“-'tern‘plate-follower roller‘j2'l. is secured to the
endiv'ofralslopingaxle 28"that rotates in anti-'
Fig. :37 isi 'a---fr‘ag-mentary* sectional‘ view‘ similar ,
frictioirbearin‘gs" 29;“30‘11'eld by vthe frame 25.? A
bevel gear 32 keyed to the axle 28 near its upper
to Fig?" l'biit-lishowingma'modi?ed"form of the
invent'io
-'
Fig'sif-ll andl 51am elevations of other modi?ed ‘
forms of the invention.
35
diameter andextends'iint'o a housing or frame
25. 'Th‘eupper end of theirame 25 has a sloping
annular‘. faceviihi'c'h contacts with‘ an undercut
shoulder‘ZBi on'the'sl'eeve; The housing or frame‘
25 rotates Ton .the‘sleev'e l5‘ as a bearing and the
outs'ideof the upwardly] extending ‘end of ‘the
frame‘ 25*fo'rms a continuation‘ of ‘the outside 20
,
7
bracket‘ :l Q'iwi'th ai-s'crew ~ -I ‘l3 for clamping (it to a
end‘ meshes" with a‘ ‘bevel gear ‘33:- fastened~v to" the
lower” end" of" drive‘' ‘shaft ‘35:
The‘ ‘frame 125'zia'nd"sleeve“l 5?v ‘are 'held assembled ‘
by ai-collar 3T6‘bn the" drive‘ shaft "351 This‘collar
supports“- a?bal‘lib‘earing' 33 inwhich ‘the shaft’ ‘3 5'.
turri's_;>'_ and-"the ball' ‘bearing ‘thrusts ‘against a
universal cutting machine." With‘ shoulder
34 lathe-frame’ 2'5 and‘ keeps the'upper'"
avin'g' .foldi-n'gi parallelogram " frames
end'
'of"-the"frame“in"coritact;
or substantially. so,
the torch isxs'upportedllfr'om the’iront-bar and‘
partakes of the same mover-ment-x a's a‘tracer or with‘1 the undercut" sho'uld'e'r' "26 "of' the sleeve‘;
The axis-cf rotation‘ of the'frame 25 about the‘
template-follower clamped to the bar. The in
sleeve‘ 6'5"istcoihcident'with"the‘axis of the drive‘
ventionristnoh 'limit'ed' toli~machlnesv of‘ the folding shaft
35, and the point‘ of‘tractionof the roller ‘
paral-le‘lograml'stype, however}: and’~ the bat-P12 is 21 on-a'te'mmate
~3’l- is‘in line wit'hthe‘axisof the '
barlc'?'niof
machines 1
40
representative‘ of-i. as universal cutting machine
fr'amegwhich isrto :bev moved in?- accordance with
the :o‘utline-rofa-a template‘.
Thetbracket‘ vHill-has: a- vertical-tubular- bearing
l4 th'rough'rwhichka- sleeve l5 extends.- The
shaft? 35.-
Y
The roller‘ 21' is prevented-from running oiT the‘.
top face of‘the template 37‘by'guide means which‘
includesa'lower“guide roller '39‘,‘ atv the end of
sleeve rl?v'is- freekto‘Islideiup'andwdown in'the bear- ~ the anew in position 'to*conta‘ct with‘one side.
in‘g il‘?-"for 1a limited ‘distance but- is‘ prevented of the’ template, and ‘two other: guide rollers for"
wheels “that contact with'the other side? of the"
frOn-iLt‘urningFIcyia- rack I‘! which is ‘fastened template.“
The guideroller. 39"‘is'pre'ferably in"
to thesl'eeve by'scre'ws I8 and extends: into a .tegrarwit‘h'the roller 21 and‘ axle‘ 28'but may-pa
slot'l'9 in the bracket ID.’ This slot is in‘e?ect a
keyw'ay‘ 'and- the1 rack IT a key to prevent the van idler rotatable independently. of the roller‘ 21;.
In‘an'y' event some slippage of the
55 sleeve-‘from: rotating,‘ buttheslot I9 is longer andaxlet'28i'
peri‘pher'y‘o'f the guide roller 39 on‘ the side' of the
2,130,373
2
template will occur because the different points
on the surface of the guide roller are not equi
distant from its axis of rotation and therefore
travel at different velocities when the guide roller
CH
turns. This slipping is not objectionable, how
ever, because the guide roller does not support
the weight of the template-follower and has rela
tively light contact with the template.
The wheels 49 are preferably idlers and are
supported by screws 4| from a swivel member
ll) 42 which turns about a vertical screw 44 threaded
into the oblique bottom face of a rod 45. That
part of each of the screws 4| just above the head
of the screw comprises the axle for the wheel
40 supported by that screw, and the large ?at
15 head of each screw 4| serves as the thrust bear
ing which supports the weight of the wheel 4!).
Rotary means driven by power can be employed
in place of the wheels 40, but the additional trac
tion obtained in this manner is unnecessary with
most machines on which the template-follower of
this invention is used.
The rod 45 slides longitudinally in an inclined
bore in the frame 25 but is prevented from turn
ing by a pin 41 which is ?xed to the frame 25 and
I, extends through a slot 48 in the rod 45. A coil
spring 50 is pressed against the upper end of the
rod 45 by a screw 5| which threads into the upper
journaled in the frame 25'. A bevel gear 58 on
the shaft 56 meshes with a gear 59 at the upper
end of an axle 28' to transmit rotation of the
shaft 56 to the axle 28'.
Ball bearings 29’ and 30' hold the axle 28' at
an inclination and there are a traction roller 21'
and a guide roller 39' at the lower end of the
axle. When turning sharp curves with the modi
?ed form of the invention shown in Fig. 3 there
is substantially no epicyclic effect to increase or
decrease the speed of the roller 21'. If the frame
25’ makes a turn of ninety degrees, the only
movement of the gear 58 caused by the turning is
a rotation through an angle corresponding to one
quarter of the distance between teeth of the
worm gear 55, and the angular movement of the
rollers 21’ and 39’ is only slightly more, depend
ing on the ratio of the gears 58, 59.
Fig. 4 shows a modi?ed roller assembly which
makes it unnecessary to have the wheels 40 to
keep the traction roller on the template. In ad
dition to a traction roller 52 and a guide roller
63 corresponding to the rollers 21. and 39, re
, spectively, of Fig. 1, another guide roller 65
is connected with the axle in position to contact , '
with the side of the template remote from the
roller 63. Since the guide roller 53 prevents the
traction roller 62 from running off the template
end of the bore in which the rod 45 slides. The ,to the left and the guide roller 65 prevents the
pressure of the spring 50 yieldably holds the traction roller from running off to the right,
.
wheels 40 against the side of the template, and the wheels 40 are no longer necessary. ‘
Fig. 5 shows a template 69 which has a groove
the reaction of the spring against the screw 5|
acts through the frame 25 and urges the guide along its top face, and a traction roller ‘H runs
in this groove as shown in the drawing. This
roller 39 against the template.
groove gives the roller greater friction contact 35
.One of the wheels 40 contacts with the tem
with the template, and it keeps the roller from
35 plate a short distance ahead of the point of trac
being displaced laterally of the template when
tion of the roller 21 on the template, and the
other wheel 40 touches the template some dis
tance behind the point of traction. The distance
between the wheels 40 is made short so that the
40 template-follower can turn curves of short radii.
The spring 50 makes it possible for the wheels
40 to move either way, depending upon whether
they are on the inside or outside of a curve, to
allow for the curvature of the arc of the template
between the Wheels 40. The guide roller 39 has
line contact with the template along a vertical
line and therefore does not bind when passing
around sharp curves, as is the case with ordinary
50
Cir U!
?anged wheels.
A slight speeding up or slowing down of the
template-follower of Fig. 1 occurs when it turns
sharp curves because of the epicyclic effect when
the gear 32 rolls around the driving gear 33. The
epicyclic effect causes the speed of the template
follower to increase when the gear 32 rolls in the
same direction that it is turning, and to slow
down when the gear rolls in the opposite direc
tion. This variation in speed is not enough to be
objectionable with ordinary work, but when very
60 uniform speed is essential it can be obtained with
the structure shown in Fig. 3.
The upper, broken away portion of the tem
plate-follower shown in Fig. 3 is the same as that
shown in Fig. 1, but in Fig. 3 a frame 25' is
slightly different in shape ‘from the frame 25
of Fig. 1 to allow for a different location of bear
ings. Wheels 41' are supported from. a swivel
member 42’ at the end of a rod 45’ which slides
in‘the frame 25’. The parts in Fig. 3 that cor
respond with parts in Fig. 1 are indicated by the
same reference character with a prime ap
pended.
.
A worm 54 at the lower end of a drive shaft 35'
drives a worm gear 55 secured to a shaft 56
the follower is not in operation. When the roller
‘H is driven to cause the follower to travel along
the template, the frame and other structure to 40
which the template-follower is connected and for
which it furnishes the motive power has friction
in its bearings and offers resistance to the move-,
ment of the template-follower.
As a result of
this resistance the .gear 32 (Fig. 1) tends to ro-g .
tate around the driving gear 33 to turn the frame
25 about its axis. Such a turning of the frame
would cause the roller ‘H (Fig. 5) to climb out
of the groove in the template 69, but such move
ment of the traction vrolleris prevented by a
guide roller 13 which is similar in construction to
the guide rollers 39 and 63 employed with the
embodiments of the invention shown in Figs.
1 and 4.
I
It will be understood that terms of orientation
used in the description and claims are relative.
The invention is not limited to the embodiments
illustrated and some features can be used with
out others without departing from the inven- '
60
tion as de?ned in the claims.
I claim?
1. A template-follower for a universal cutting
or welding machine including in combination
a roller for contact with a template, an axle
about which the roller turns, said axle having a
substantial inclination so that the roller tends
to travel transversely of the template, a frame
holding the axle, and a bearing on which the
frame rotates, about an axis in line with a point
of contact of the roller on the template, to change 70'
the direction of travel of the template-follower.
2. In a template-follower, a frame rotatable
about a vertical axis tovsteer the template-fol
lower, anaxle carried by the frame, a roller on
the axle in position to contact with a template 75
2,130,373,
at a point in line with the axis of rotation of said
frame, the axle being at a substantial, acute‘
angle to the vertical so that the roller tends to
travel toward one side of the template, and a
guide roller connected with the ?rst roller in posi-'
tion to contact with a side of the template when
the ?rst roller is operating along the top. face of
the template.
‘
.
.
a
3. In a template-follower,a frame and a bear
10 ing on which the frame turns as the template_
follower changes its direction of travel, an in—
clined axle carried by the frame, a template-fol
lower roller on the axle in position to contact
with the top of a template at a pointin'line with
15; the axis of rotation of the frame, a second roller
on said inclined axle in position to contact with
one side of the template and serve as a guide to
con?ne movement of said template-follower roller
transversely of the top face of the template, and
template.
4. In a template-follower, a frame and a bear
ing on which the frame turns as the template
follower changes its direction of travel, an in
clined axle in the frame, bearings in the frame
in which said axle rotates, a roller secured to
the axle at a location which puts the lowest point
of the roller in line with the axis of rotation of 30
placement of the template-follower roller trans
versely of the template.
5. In a template-follower for cooperation with
a template having a longitudinally recessed top
35 face, a traction roller having a face which ?ts
into the recess of the template, an axle for said
traction roller, the axle being inclined with re
spect to the template so that the traction roller
tends to climb out of the recess toward one side
40 of the template, and a guide roller connected‘
6. A template-follower including a traction
a guide roller attached to the traction roller in
position to contact with a side of the template
and prevent transverse displacement of the trac
tion roller, and yielding means which hold the
guide roller against the template.
7. A template-follower including a traction
‘roller which runs on the top face of a template,
a guide roller attached to the traction roller in
position to contact with a side of the template
and prevent transverse displacement of the trac
tion roller, a second guide roller which contacts
with the other side of the template, and yielding
means for urging said second guide roller against
the side of the template.
8. A template-follower including a traction
roller constructed and arranged to travel along
the top face of a template and having a guide
roller directly connected with the traction roller
and located in position to contact with one side
65 of the template at a set distance from the traction
rollerytwo wheels in positions to contact with
the side of the template away from the guide
roller at points slightly ahead of and slightly be
hind the line of contact of the traction roller
70 and its guide roller with the template, and means
urging the wheels toward the guide roller to hold
said wheels and guide roller in contact with oppo
site sides of the template.
9. A template-follower comprising a frame, an
axle carried by the frame, a traction roller on
said axle having a substantial inclination so‘that -
drive shaft and the roller.
11. In a template-follower, a vertical drive
shaft, a frame, a bearing on which the frame 25
turns about the axis of the drive shaft, an in
lower roller on the axle in position to contact
with the top of a template at a point in line with
the axis. of rotation of the frame, and two guide
rollers on the axle in position to contact with
opposite sides of the template to prevent dis
45 roller which runs on the top face of a template,
and a swivel connection between said support and 10v
the frame.
10. In a template-follower, a vertical‘ drive
shaft, a frame, a bearing onwhich the frame
turns about the axis of the drive shaft, an in
clined axle in the frame, a templateefollower‘ 15
roller on the axle with the low point of the roller
in line with the axis of ‘rotation of the frame,
motion transmitting connections between the
25 clined axle carried by the frame, a template-fol
from moving out of the recess.
points slightly ahead of and‘ slightly behind the
lineof contact of the traction‘roller and its guide
roller with the template, a support for said wheels,
the roller tends to travel transversely of the
template, guide means for preventing transverse
movement of the roller on the template, and
20 means for holding the second roller against the
with the traction roller in position to contact with
the other side of the template to prevent the roller
3
the axle in position to contact with ‘and travel
along the top face of a template and having a
guide roller attached to the traction roller in
position to contact with one side of the template,
two wheels :in positions to contact with the side
of the template away-from the guide roller at
the frame, said axle having a substantial inclina—
tion so that the roller tends to travel transversely
of the template, guide means which prevent the
roller from running transversely and which hold
said roller on the top surface of the template, 35
and gearing connecting the drive shaft with the
axle.
12. In a template-follower, a vertical drive
shaft, a frame, a bearing on which the frame
turns with respect to the drive shaft and about
the axis of the drive shaft as the template
follower changes its direction of travel, an in
clined axle in the frame, bearings in the frame
in which said axle rotates, a roller secured to the
axle at a location which puts the lowest point
of the roller in line with the axis of rotation of 45
the frame, said axle having a substantial inclina
tion so that the roller tends to travel transversely
of the template, guide means which prevent the
roller from running transversely and which hold
said roller on the top surface of the template, and
gearing connecting the drive shaft with the axle,
said gearing including a worm on the drive shaft
operating a worm wheel which has its axle sup
ported by the frame.
13. A template-follower including a traction 55
roller supported for rotation about an ‘axis which
has a substantial inclination, means for main
taining the roller in contact with a template and
the incline of the axis in a de?nite relation to
the template, said incline being su?icient to make
the roller tend to move transversely of the tem
plate,‘ and apparatus for driving the traction
roller.
14. A template-follower including a frame, a
bearing on which the frame turns about a sub
stantially vertical axis, an axle held in the frame,
a traction roller on the axle constructed and
arranged to contact with a template, said axle
having a substantial inclination so that the roller 70
tends .to travel transversely of the template,
means holding the traction roller against trans?
verse movement with respect to the template and
holding the frame against turning except in ac
cordance with turns in the template, and power 75
4
2330;373
means connected withythe traction roller for.
rotating 'said roller.
,:115.'A template-follower including a frame, a
bearing on‘which -the ‘frameturns about .a sub1 stantiallyvvertical axis, an inclined axle held in
the frame, roller means on the axle in position
to contact with a supporting surface and with‘
an‘upstanding side of the template, said axle hav
ing a substantial inclination so that the roller
10-? tends to travel transversely of the'template, .and
means connected with the frame in position to
contact'with‘ the side of ‘.the template opposite
to that with which *said roller contacts to vhold
the rolleragainst the template and-keep the frame
15? from turning except'in accordance with turns in
the template.
16;.An automatic template-follower including,
aroller having a‘facewhich ‘bears against a guid
inglsurface ofva template,andrhavingv a friction
face :constructedland arranged to bear against
a surface which'is- at an inclination to the axis
of rotation of the "roller to produce a tractive
force having a component toward the'guiding sur
face of the. template,.and power means for rotat
ing the‘ roller.
1'7. In a template-follower, an inclined axle,
and a roller on=the axle with two contact faces
in such‘ relation that one ‘face rolls along an 10
upstanding guidingxedge‘of a template while the
other l-faceisupports the roller ‘from? a substan
tiallyv horizontal surface and supplies tractive
force to the template-follower with a component
of the tractive ‘foroem'ging the roller vtoward. the 15
guidingedge of the. template.
JAMES L. ANDERSON.
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