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Патент USA US2409975

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Oct. 22, 1946.
I
W.‘J. BRETH El'AL
12,409,974
TIRE BUILDING MACHINE
Filed Aug. 6, 1942
12 Sheets-Sheet 1
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%lter J. Bret-h
> Robert v1V1; mrmald
BY
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ATTORNEYS
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Get. 22, 1946‘
2,409,974
w, J, BRETH ETAL,
‘TIRE BUILDING MACHINE '
1 Filed Aug. 6, 1942
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INVENTORS
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Walter J. Breth
Robert M. mrmald'
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Patented Oct. 22, 1946
2,409,974
uNirso STATES LFPATENT OFFICE
2,409,974
TIRE BUILDING MACHINE
Walter J. Breth and Robert M. Wormald, Akron,
Ohio, assignors to The General Tire and Rub
ber Company, Akron, Ohio, a. corporation of
Ohio
Application August 6, 1942, Serial No. 453,806
26 Claims. (01. 154-10)
1
2
This invention relates to a method of and ap
Fig. 9 is a section taken on the line indicated at
9-9 in Fig. 4, looking in the direction indicated
by the arrows, a portion of the expansible bead
paratus for building pneumatic tire casings, the
present invention being an improvement on the
method and apparatus disclosed in the patent
to Breth 2,313,035 granted March 9, 1943.
The main objects of the present invention are
engaging member being broken away and shown
to provide a method by which the layers of fabric
are kept smooth and are uniformly adhered to
gether, and to provide an apparatus for per
line indicated at I0—i0 in Fig. 9;
Fig. 11 shows a portion of the fabric folding
forming the method steps which is of simple and
ring to one of its supporting levers;
compact construction and which is highly effi
cient in operation.
A further object of the‘invention is to provide
larged scale the inner end portion of one of the
levers supporting the fabric folding and stitching
fabric folding and stitching devices which are so
ring;
in section;
‘
Fig. 10 is a fragmentary section taken on the
and stitching ring‘and the attachment of the
Fig. 12 is a sectional view showing on an en
operated as to positively hold the fabric in po 15
Fig. 13 is an axial section through the cam
sitions to which it has been folded during the
that controls the stitching and bead setting de
intervals between successive folding and stitching
vices;
operations.
Fig. 14 is a development of the cam in which
successive positions of the cam with respect to the
actuating rollers which travel in the grooves is
indicated by cross lines, which are designated by
?gure numerals which indicate the figures of the
drawings, which show the successive positions of
A further object is to provide folding and
stitching devices in which the travel of the stitch
ers and folders over the fabric is always in the
direction to apply tension to the portion of the
fabric being folded or stitched, the fabric engag
ing elements being held out of engagement with
the stitching and bead setting devices;
the fabric during return movements.
Figs. 15 to 26 show successive positions of the
25
fabric folding and stitching and bead setting de
With the above and other objects in View the
invention may be said to comprise the method of
vices;
and apparatus for building tires as illustrated in
Fig. 15 shows the bead setting and fabric fold
the accompanying drawings hereinafter described
ing and stitching devices in the position which
and particularly set forth in the appended claims, 30 they initially occupy, the dotted circles indicat
together with such variations and modi?cations ‘
art to which the invention pertains.
l
Reference should be had to the accompanying
drawings forming a part of this speci?cation, in
which:
ing‘ the initial path of movement ‘of the ex
pansible fabric folding and stitching ring from
the position shown in full lines;
Fig. 16 shows the folding and stitching ring
positionedoverhanging the edge of the tire build
ing drum outside the fabric band on the drum,
the dotted circles showing the path of movement
of the ring in folding the fabric inwardly against
the drum ?ange;
Fig. 17 shows the bead setting device with the.
40
thereof as will be apparent to one skilled in the
‘
‘ Figure 1 is a fragmentary front elevation of a
tire building machine embodying the invention;
Fig. 2 is a fragmentary top plan view of the
portion of the machine shown in Fig. 1;
Fig. 3 is a vertical section taken on the line '
-- bead support adjacent the drum and the presser
holding a bead ring against the fabric overlying
indicated at 3-43 in Fig. 1, looking in the direc
tion indicated by the arrows;
Fig. 4 isa, fragmentary horizontal section taken
on the line indicated at 6-45 in Fig. 3;
the drum ?ange;
‘
Fig. 18 shows the bead support retracted and
the expansible bead engaging member after it
Fig. 5 is a fragmentary vertical section taken ' ‘ has been moved outwardly to a position within
on the line indicated at 5-Ei in Fig. 3, looking in
the bead ring to fold the fabric across the in
the direction indicated by the arrows;
terior of the bead ring and after it has been ex
panded to press radially outwardly upon the
Fig. 6 is a sectional detail view taken on the
50 bead ring;
line indicated at li—? in Fig. 5;
Fig. 7 is a detail View showing a portion of the 1
Fig. *19 shows the bead support and presser
tread stitching ring and its attachment to one
retracted and the folding and stitching ring
of its supporting arms;
Fig. 8 is a vertical section taken on the line
indicated at 8-—B in ‘Fig. 4;
’
pressing the fabric ?ap against the outside of
the bead ring, the‘ dotted lines indicating the
55 movements of the bead‘support and presser and
2,409,974
4
3
the folding and stitching rings from the position
on the drum A, the ?rst operation is to apply a
cylindrical band composed of a plurality of layers
shown in Fig. 18 to the position shown in full
of rubberized fabric upon the drum A. The fab~
lines;
Fig. 20 shows the fabric folding and stitching
ric employed is of a width greater than the length
ring in the position which it occupies after the 5 of the drum so that the edge of the cylindrical
band of fabric projects beyond the edge of the
completion of, the folding and stitchingv move
drum, as shown in Fig. 15 of the drawings. After
ment, the dotted circles indicating the path of
the fabric band has been applied to the drum the
movement of the ring during the stitching opera
fabric edges are folded down against the edge
tion;
.
Fig. 21 shows the folding and stitching ring 10 flange of the drum, as illustrated in Fig. 16. The
folding operation is preferably performed by a
in retracted position, the dotted line indicating
stitching annulus which engages the fabric band
the path of movement of the ring, from the posi
throughout- its circumference and simultaneously
tion shown in Fig. 20;
folds the band edges throughout the circumfer
Fig. 22 shows the folding andstitching ring po
sitioned for folding additional layers of fabric 15 ence. After the‘ fabric has been folded down
against the drum flange, a bead seating ring to
over the bead;
which‘ a‘ flipper strip has been applied is pressed
Fig. 23 shows the fabric folding and stitching
against the fabric overlying beyond the flange of
ring moved down against the side face of. the
the drum, as shown in Fig. 17. The portion of the
bead;
Fig. 24 shows the fabric folding and stitching 20 fabric extending inwardly of the bead ringv is-then
ring. moved inwardly to fold the fabric against . folded outwardly across the bottom of the bead
ring, as, shown in Fig. 18, and then upwardly
theinterior of the bead;
against the outer side of the bead ring,,as shown
Fig. 25 shows the position to which'the fabric
in Fig. 19, after which the fabric edges and the
folding and stitching ring is moved prior to re
traction;
25 ?ipper strip are stitched down upon the exterior
Fig. 26 shows the bead setting and stitching’
of the fabric band, as shown in Fig. 20. The .
members retracted and the eXpansible auxiliary
stitching device is then retracted, as shown in
folding device moved to a position outside the
Fig.2l, and additional layers of fabric‘are built
drum to permit collapse of the drum and removalv
Figs. 27, 28 and 29 show the tread stitching.
operations, Fig. 2'7 showing the stitching ring in
the position from which it may be contracted into.
engagement with the central portion of the tread,
Fig. 28 showing the ring in tread engaging posi-'
tion, and Fig. 29 showing the tread stitchingde
vice near its retracted position; and
Fig. 30 is a control diagram showing the man
ually and automatically operated switches con
trolling the motors which actuate the folding,
bead setting and-stitching devices.
up upon ‘the fabric previously applied to the drum
30 with the edges of the fabric projecting beyond
of a ?nishedtire;
'
the beads, as shown in Fig. 22. The rubber tread
is preferably applied to the fabric carcass and
stitched down, as illustrated in Figs. 27,‘ 28 and
29,.immediateEy after the application of the addi
tional fabric layers.’ The projecting edges of the
fabric arev then folded'down over and under the
bead portion of the carcass, as shown in Figs. 23
and 24. The stitching of the tread to the tire
carcass is performed as illustrated in Figs. 27, 28
and 29. by moving stitching annuli simultaneously
from the ‘center of thetread outwardly over the
side edges of the drum. The various fabric fold
ing and stitching operations and the setting of.
the bead ring are accomplished, by mechanisms
comprises a tire building drum A of conventional
construction, whiclris collapsible to permit re 45 which are operated at, the, propertimes during
the tire building cycle, and these mechanismswill
moval of a tire after it has been built thereon,
now be described.
and bead applying fabric folding and stitching
mechanisms indicated generally by the reference
‘Fabric folding and stitching device
characters B and C and disposed upon opposite
Referring to the accompanying drawings, the
tire building machine of the present invention
sides of the drum. The mechanisms B and C, 50
The main folding and stitching element is a
are identicalexcept that one of the mechanisms
resilient, contractible annulus 9 composed of a
is mounted upon acarriage which ismovable ax
series .of coil springs?a, which are attached at
ially of the drum so that the mechanism on the
their ends to plugs [9 which havev end portions
carriage can be moved far enough away from the
drum to permit removal of .a tire from the drum. 55 spirally grooved to receive the spring coils,,as'
shown in Fig. 11, and a central groove H which
Inasmuch as the two mechanisms B and C are
receives a hook i2 which has a shank attached by
identical and their operations are simultaneous,
means of a screw 53 in a socket M of a radially
only the mechanism B is illustrated in detail in
the accompanying drawings.
movable lever A5. The stitching ring is support
The drum A is mounted upon a shaft I carried 60 ed by a considerable number of levers l5‘ which
are connected by transverse pivots i6 to'spaced
by a supporting frame 2. The drum A is ?xedto
projecting arms Ii‘ carried by, a supporting, disk
the shaft and the shaft may be driven to rotate
is which is slidable‘ on the shaft‘ l-.. The levers
the drum by a motor 3 which drives the shaft l
P5 are mounted to swing. radially with respect'to
at a reduced speed through a small pulley 4‘, a
the axis of thedrum and are adapted to expand
large pulley 5, a small gear 6, and a large gear 1.
the stitching ring against the action. of the
The shaft I has a reduced end portion 8 which
springs 9a.
?ts in a socket formed in the end of a coaxial
Each of the levers l5 has a’ depending arm i5
shaft la which is carried by the frame of- the
and a buffer link 2il'which is pivoted at its outerv
mechanism C. The shaft is may be a non-ro
tatable shaft since it merely serves as a support 70 end to the pivots I6 of the arm. and which car;
ries, a roller 2! at its inner end. A bolt 22 at
for the free end of the shaft I and to maintain
~ tached to the link 20 extends through an aper
alignment between the mechanisms B and C.
The sequence of operations performed by the 5
ture in the arm I!) and a coil spring 23 surround
machine of the present. invention is shown. in
ing the bolt is interposed between the arm is
Figs. 15 to 29 of the drawings. In building a tire 75 and the link 20, so that actuating thrusts trans
2,4095974
5
mitted through the roller 2! are cushioned by"
the spring 23. The levers l5 are simultaneously
swung in an outward direction about their pivots
by means of a disk 24 slidably mounted upon the
shaft l and engageable with the rollers 2i. The
disk 24 is actuated by means of rods 25 attached
to the disk and extending substantially parallel
to the shaft l to an actuating lever 26.
The stitching and folding ring is not only ex
pansible and contractible but is also movable"
bodily in an axial direction into and out of op
erating position. The axial movement of the fold»,
ing and stitching ring is accomplished by means
of an actuating disk 21 which is slidable on the
shaft i and which may be moved by means of
rods 28 attached to the disk 21 and extending
parallel with the shaft 1 to an actuating lever ,
29. The disk 2'! has a series of rods 35 attached
6
Means is provided for moving the disks 39 and
1'48 relative to one another to expand the shoes
40 into fabric engaging position and to move
the disks simultaneously axially along the shaft
l to fold fabric across the interior of the bead
ring. The actuating means comprises axially ex
tending rods 50 attached to the disk 39‘ and ex
tending through apertures 5| in the disk 48, the
outer ends of the rods 50 beingr connected to an
actuating lever 52. A plurality of axially ex
tending actuating rods 53 are attached to the disk
138 and extend to an actuating lever 55. The le
vers 52 and 55 are operated at the proper times
during the folding operation to impart the neces
sary movements to the shoes and disks.
Bead ‘applying mechanism
A cylinder 56 concentric with the shaft l and
thereto adjacent its periphery and extending ax
surrounding the disks l8 and 21 is mounted on
ially from the disk toward the drum A. The rods 20 the frame 2 for axial movement toward and away
35 extend through apertures in the disks l8 and
from the drum A. A supporting ring 51 is at
are provided with heads 36 which are engage
tached to the interior of the cylinder 555 at its
outer end and the ring 51 has axially disposed
able with the outer face of the disk l8 to limit
the relative axial movements of the disks l8 and
rods 58 attached thereto and extending to an ac
2?. The disk 25 is provided with apertures 3'5 25 tuating lever 59. An inner cylinder 66) is slid
through which the heads 33 of the rods may
ably mounted on the interior of the cylinder 56,
move so that the disk 24 may be moved inde'—
the movement of the cylinder 60 being limited
by the ring ‘57 and by an inwardly projecting
pendently of the disks [8 and 21.
Coil springs 38 are mounted on the rods 35
flange Bl at the inner end of the cylinder 55.
and have opposite ends engaging the disks i8 30 The cylinder 60 has circumierentially spaced
yieldable resilient arms 62 which project past
and 21. The springs 38 tend to normally hold
the interior of the flange BI and provide spaced
the disk l8 against the heads 56 of the rods 35.
supports for a contractible spring ring 63, which
When the disk 2“! is moved axially toward the
provides a support for a previously formed bead
drum A by means of the rods 28, the springs
ring, as is shown in Figs. 15, 16 and 17. ‘
‘$8 will cause the disk l8 to move simultaneously
The cylinder 60 has a ring 64 attached to its
with the disk 21 unless such movement of the
interior at its outer end and this ring has a‘se
disk i8 is resisted. Movement of the disk it
away from the face of the disk l8 moves the
outer ends of the levers l5 radially outwardly and
expands the stitching ring. The stitching ring
may thus be expanded to a diameter greater than
that of the drum A and moved axially to over
lie the fabric on the periphery of the drum. ‘By
moving the disk 2d back toward the disk IS, the
springs 9 may be permitted to contract, drawing
the stitching ring to a smaller diameter and press
ing the ring against the fabric on the drum. When
the stitching ring is pressed axially against the
side flange of the drum, pressure is exerted through
ries of axially extending rods 65 attached there~ ‘
to and projecting through apertures in the ring
57. The rods 65 have heads 66 which engage
with the outer face of the ring 5'! to limit the
inward movement of the cylinder 6!! and the heads
53 are engageable with adjustable stops 61 car
ried by the ?xed frame 2. The stops B7 are screw
threaded for engagement with suitable threaded
openings in the frame and are held in adjusted
position by suitable means such as a lock nut 68.
Prior to the application of fabric to the drum
A, the bead rings with the ?ipper strips attached
thereto are mounted upon the contractible ring
63, as shown in Fig. 15 of the drawings, and after
the fabric has been folded down over the ?ange
of the drum or carcass.
of the drum A, the cylinders 55 and 60 are ad
An auxiliary fabric folding device is mounted
vanced by means of the lever 59 and rods 58 to
upon the shaft l for movement into and out of
position the bead ring against the fabric over
a position within the edge portion of the drum.
lying the drum ?ange, as shown in Fig. 17. The
This device comprises an expansible fabric en- ,
outer cylinder 55 serves as a bead presser to
gaging disk 39 which has peripheral, radially
clamp the bead against the fabric on the drum,
movable shoes All] which are carried by radial
while the inner cylinder 80 serves as a support
plungers 4| slidable in the disk 39. The shoes 60 for the bead ring up to ‘the time of application
4E3 have fabric engaging ?anges 42 provided with
of the bead ring to the tire carcass.
tapering faces 133 which provide seats for the
In order to provide a yielding clamping pres
bead portion of the carcass during the fabric
sure against the bead ring, the actuating rods 58
folding operation. ‘The shoes 40 are normally
preferably have a yielding ‘connection to the
held in retracted position by springs 134 which 65 actuating lever 59, as best shown in Figs. 5 and
surround the plungers 4i and which are inter
6. This connection comprises a plunger 68 fit
posed between peripheral ‘portions of the disk 39
ting in a socket in the outer end of the rod 58
and enlarged end portions d5 of the plungers iii.
and a spring 19 interposed between the plunger
The enlarged portions 45 of the plungers are
59 and the bottom of the socket. The spring 10
provided with inclined inner end faces it which 70 is adapted to yield to prevent exertion of exces
are arranged for engagement with the conical
sive pressure against the bead ring.
periphery 4? of a cam disk 43 which is mounted
When the cylinder 56 is moved to retracted
for axial movement toward or away from the
position, engagement of the‘rods 65 with the
disk 39, the disk 48 being provided with a hub
stops 6‘! moves the inner cylinder 68 to the posi
49 upon which the disk 39 is slidable.
75 tion shown in‘ Fig. 15 so that the head support
the springs 38, which yield to permit the stitch
ing ring to follow the contour of the side portions
2,409,974.
ing ring 63 is beyondthe inner. end of thecylin
taneously until the stop nuts 93 of the rods 91
engage the flange Sit of the. fixed drum 89, where
cylinder 6%; moves with the cylinder 55 when the ,
upon the axial movement of the member 84-15
latter is moved axially to bead. clamping‘ posi
stopped and continued movement of the ring 80
tion, because ofv the ‘rictional engagement of. 5 on the member 8!? will cause the rollers 8| to
the coil spring ring 53 with the interior of the
ride out of the groove 36 and over the inner end
bead ring, the outside diameter of the. seating
of the member 813, permitting the spring ‘Ha.
ring 63 being normally slightly greater than the
to contract the annulus ‘H into engagement
internal diameter of the bead ring. ‘When the
with the tire tread,v as shown in Fig. 28 of the
disk It is retracted to move the stitching an 10? drawings. Actuation of the bars 8! in the op-po
nulus 9 ‘away from the drum,. the inner ends‘
site direction drags the annulus ‘H across the
of the pins 65' are engaged by the disk i8 and
periphery of the drum, as illustrated by the
the cylinder so is‘ movedv outwardly to position
dotted circles in. Fig. 28-, pressing the tread stock
der 56 in position to receive a bead ring.
The
the supporting ring; '53" clear- of the fabric flap,
against the underlying fabric throughout the
as shown in Fig. 18_
periphery of the drum.
'
Tread stock stitching mechanism
The tread stock stitching device includes a
resilient annulus ill‘ composed‘ of a series of coil.
springs li'a attached at their ends to plugs 12,
which are grooved spirally at their ends to re
ceive coil springs lid and each of which has a
central groove ‘F3 to receive a hook iii‘, which has
It will be understood
that the two mechanisms on opposite sides of the
drum A may bringv the stitching devices into;
engagement with the tread simultaneously andv
that the movement of the stitching rings from
20 the center to the edge of the drum’ may be simul
The retracting movement’ of the ring
St is continued until the member 84 is again'en
gaged with the drum 89, as shown in Fig. 29, and
. taneous.
a threaded end '85 held in adjusted'position by
the rollers ?ll of the arm Ti engage the conical
lock nuts ‘it in the outer end of a supporting
cam portion 95 at the inner end of the drum 89,
arm W. A large number of regularly spaced sup 25 . moving the arm ‘i7 radially outward and expande
porting arms T7‘ are employed. to support the
ing the annulus H as the- rollers 81 ride. up the
spring annulus ‘ii and thesev arms are mounted
conical cam t4. As the rollers 81 approach the
for radial swinging movements about transverse
outer portion of the cam 915,- they engage with
pivots ‘i8 connecting the arms ‘ii to fixed arms
the inner end of supporting member 84 and push
‘i?'attached to a ring 8b‘, which is disposed coaxi~
ally with the shaft 1' and which is attached to
the inner ends of actuating bars 8i ‘provided
with rack. teeth. 82'which are engaged by actuat
ing pinions 83, by means of which the ring 81)
the member 36 outwardly until itsinclined inner
edge is aligned with the surface of the cam 94,
whereupon the'rollers 87 ride over the edge of
the supporting member 134 and drop into the re
taining groove 89.
may be moved axially toward or away from the
drum A. The ring til‘ is slidably mounted upon
Actuating mechanism
a cylindrical supporting member 813 and move
A tread stock stitching device and fabric fold
ment of the ring Ed on the member 813 is limited
ing and stitching and bead applying devices are
by an external rib 35 formed on the member M
and intermediate its ends. Adjacent the inner 40 preferably actuated independently of the drum
A. As herein shown, the tread stitching devices
end thereof the supporting member 84 is pro
are operated by an electric motor 95 which drives
vided with a circumferential groove 86 which is
a longitudinal shaft tit-through a sprocket chain
adapted to receive rollers S‘? which are mounted
9?. I The shaft 95 has telescopic driving connec
on arms 88 projecting inwardly from thearms
* tion with a coaxial shaft Qiiawhich serves to actu
it‘. The cylindrical supporting member Bil‘ is
ate the corresponding stitching devices of mech
slidably mounted upon a ii‘xed‘ drum 89 attached
anism C. The shaft 95" drives a secondlongitu
to the frame 2, and this drumhas a ?ange 95 at
dinal shaft 98 through a sprocket chain 99 and the’
its outer end which limits the outward move
shaft 93 drives a crank ltd to which is attached
ment of the member 354 and ring 8%. Movement
a vertical rack Hi! which meshes with a- pinion
of the supporting member '84 andring 89“inward~
5&2 on a shaft Hi3 whichcarries the pinions 83,
ly toward the drum is limited by a series of
which actuate the, bars 3! to shift the tread stitch
rods 95 which are attached at their inner ends
ing devices toward or away from the drum A.
to the rib 35 of
member 8521 and extend
through. apertures in the ring 8% and ?ange 93.
The fabric folding, stitching and bead applying
The‘ outer ends 92 of the rods iii are threaded’ Ur M' devices are actuated by means of an electric motor
ltd which drives a transverse shaft £65 through
and stop nuts Q3 are adjustably mounted upon
the threaded ends 92.
When the supporting member 8G and ring. 80
moved to a position adjacent the drum, as
suitable reduction gearing in a housing I66. The
shaft Hi5. carries a worm,l it? which meshes’ with
a large worm gear 188, which is ?xed to av longi
shown in Fig. 27, by means of the actuating bars 60 tudinal shaft I99 which carries a lever actuating
cam H0. The cam He serves to operate the
8i, the stop nuts i33- are brought into engage
levers 26, 29, 52, 55 and to in the proper sequence, '
ment with the ?ange til to limit the movement
the. levers 26, 29, 52, 55 and 59 being provided
of the member 8t‘, and since the movement of
with rollers H1, H2, H3’, H4 and H5, which en
the ring 89 is‘limited by the rib 85, the adjust
ment of the‘ nuts 5-53 determines the innermost 65 gage in circumferential grooves H6, Ill, H8, H9 ‘
adjustment of the stitching rings ‘ii.
I
and I20 in the cam i it. The motor 3 for operat
ing the drum A may be manually controlled by
In the retracted position of the tread stitch
suitable start and‘ stop switches (not shown).
ing device, as shown in' Fig. 5, the ring 89 is, posi
tioned adjacent the outer end of the member 85,
The control for motors 9E and Hit is illustrated
and the roller 8'! ‘of each of the arms ii is seated
diagrammatically in Fig. 30 of the drawings. A
in the groove 86 of the member 8d. The spring
push button starting switch I2’! is employed to
annulus‘ ‘ii is thus held in expanded position
start the motor I94- and the motor I04 is. au
so that it is free to move over the periphery of
tomatically stopped by means of a limit switch. l 22'
the‘ drum, as shownin Fig. 2'7. Actuation of the
which is adapted to be actuated’ by either of. two
bars 8| moves the member 84 and ring Bl! simul 75 angularly spaced‘ lugs I23 and’ l24'on‘ the cam
2,409,974
10
III).
The cam IIi] makes one complete revolu
over the edge of the drum and inwardly over
tion during the tire building operation and is
stopped during the application of the outer fabric
the ?ange of the drum, as shown in Fig. 16.
It will be understood that the operations per
plies and the tread stock. The lug I23 serves to
formed on opposite ends of the drum are identi
cal and simultaneous so that tension is main
stop the motor I94 after the ?rst fabric folding
and stitching operation and the lug I24 serves to
stop the motor I04 when the cam has completed
its revolution. The start and stop switches I2!
tained upon the fabric during the folding opera
tion. The movement of the disks l8, 2!; and 2'! are
so controlled that the ring .9 is held in contact
and H2 are connected to a controller box I25‘
with the inturned flap of the fabric throughout
provided with the usual auxiliary motor control 10 its periphery, as shown in dotted lines in Fig, 16,
ling switches.
while the bead carrying devices are moved into
The motor 95 is controlled by a starter switch
drum engaging position, as shown in Fig. 1'7.
I 25 adapted to be operated by a lug I21 on the
This holding of the flap during the movement of
cam H0 and by a limit switch I28 adapted to be
the bead applying devices is of importance in that
operated by a lug I29 on the rod 8|, the switches 15 it prevents the fabric from springing out away
I26 and I28 being connected to a conventional
from the drum ?ange prior to application of the
controller box I30. The motor I04 is started by
bead ring. When the bead is ?rmly clamped
means of the push button switch I2I to start
against the fabric on the edge of the drum, the
the ?rst fabric folding and stitching operation
fabric is securely held in place by the bead ring
and is stopped by engagement of the lug I23 with 20 and the bead support, so that further holding of
the limit switch I22 after completion of the fold
the fabric by the ring 9 is unnecessary.
ing operation. After the outer fabric plies and
With the parts positioned as shown in Fig. 17,
the tread stock have been applied to the tire car
the lever 5| is actuated to shift the disk 39 out
cass, the push button switch I 2I is again operated
wardly and to expand the shoes 49 to approxi
to start the motor I84. Immediately after the
mately the internal diameter of the bead ring,
second starting of motor I04, the lug I21 on the
whereupon the disks 39 and 48 are moved out
cam IIll engages the switch I26 to start the
wardly simultaneously by the levers 52 and 55
motor 95 which operates the tread stitching
to draw the ?anges 42 of the shoes 40 against
mechanism. At the completion of the reciprocat
the portion of the fabric extending inwardly past
ing stroke of the rods BI, the limit switch I28
the interior of the bead ring, folding the fabric ‘
is operated by the lug E29 to stop the motor 95.
outwardly across the interior of the bead ring,
The motor IEM continues to operate and continued
as shown in Fig. 18 of the drawings. After the
rotation of the cam IIil effects the second fabric
fabric has been folded across the interior of the
folding and stitching operation. When the latter
head the disk 2d is again actuated by means of
stitching operation is completed the cam I It! will
the lever 26 to expand the ring 9, and the disk
have completed its revolution and the motor I04
I8 is moved bodily toward the drum A by means
will be stopped by engagement of the lug I24 with
of the lever 29 to press the ring 9 axially toward
the limit switch I22.
the drum while the ring 9 moves outwardly across
the outer face of the bead ring, folding the edges
Operation
or the fabric outwardly over the bead ring, as
The initial step in the tire building operation
shown in Fig. 19.
comprises the application of a plurality of carcass
As the stitcher ring 9 moves up over the top of
plies of rubberized fabric to the drum A while
the bead ring, as shown in dotted lines in Fig. 20,
the mechanisms B and C‘ are inactive and posi
the pressure of the disk 24 on the rollers 2| is
tioned clear of the drum A, as shown in Fig. 1.
released to permit the springs 9a to contract the
The tire fabric fed from a suitable source may be
ring 9 and exert radial pressure on the edges of
applied to the drum A in the usual way while
the fabric to stitch the same to the underlying
the drum is rotated by the motor 3. The fabric
carcass plies. When the ring 9 reaches the end
employed is of a width greater than the drum A
of its stitching stroke the disk 24 is shifted in
and is applied in the form of a cylindrical band
Wardly toward the drum to expand the ring I9
which projects beyond ends of the drum, as shown
to a position clear of the fabric, as shown in full
in Fig. 15. After the application of the fabric
lines in Fig. 20,. and the relative position of the
band, the motor 3 is stopped and the motor IE4
disk 24 with respect to the disk I8 is maintained
is started by actuation of its starting switch l2I
during the initial retractive movement of the
to turn the cam III! and operate the fabric fold
disks I8 and 23, so that there is no engagement
ing and stitching and bead applying devices in
of the ring 9 with the fabric during the retrac
the proper sequence.
tive movement, as shown in dotted lines in Fig.
In Fig. 14 of the drawings the positions of the
21. This action is important because of the fact
cam II!) with respect to the rollers carried by
that frictional engagement of the ring 9 with the
the actuating levers for successively moving the
fabric ends while moving in an outward direction
parts to the positions shown in Figs. 15 to 26,
would tend to tear the ends away from the fabric
inclusive, are indicated on the developed cam sur
to which they are attached, and is apt to impair
face, the position of the rollers in the cam grooves
the attachment between the fabric edges and the
for each of the ?gures being indicated by the cor
respondingly designated lines extending trans
versely across the grooves. To produce the move
6: 5
underlying layers of fabric.
After the bead ring has been applied and the
ment of the stitching annulus 9 indicated in Fig.
15, the lever 26 is ?rst actuated to move the
carcass fabric has been folded over the bead and
stitched down against the body of the carcass, as
disk 24 away from the face of the disk I8 and
shown in Fig. 21, the motor I04 is automatically
stopped by engagement of the lug I23 with the
.limit switch I22, whereupon the operator may
again start the motor 3 and apply additional lay
expand the ring 9, whereupon the lever 29 is
swung toward the drum A to advance the ring
over the edge of the fabric on the drum, as shown
in dotted lines in Fig. 15, to a position surround
ing the body of the drum, as shown in Fig. 16.
The disk 24 is then retracted and the disk 21
drawn rearwardly to cause the ring 9 to be drawn 75
ers of fabric and rubber, as shown in Fig. 22 of
the drawings. After the last layers of fabric and
rubber have been applied, the motor IE4 is again
started intov operation and further movement of
2,409,974
‘11
12
the cam llll will actuate the starter :switch I26
to start the motor 95 to perform the tread stitch
ing operation. During the short interval of time
"during which the motor 95 is operating the motor
Hill is running and the cam I ll] is turned through
a small angle in which the cam grooves IN, I I8,
‘?ange overlying ‘the shoulder, folding another
part of the ply ?ange against the interior periph
‘I is and .528 are substantially parallel and per
pendicular to the axis, as shown immediately be
ery :of the ‘bead ring, holding the folded part of
the ply‘?ange against the interior periphery of
the bead ring, and, while so holding the folded
ply flange, pressing an outer part of the p131
?ange against the outer side of the bead ring
and against the exterior periphery of the bead
‘ring to enclose the bead ring.
low the line designated Fig. 21 in Fig. 14. During
this period there is a slight expanding movement 10
4. In the [method of 'building‘a tire on a form
of the stitching element 9, but this movement is
having a circular shoulder at one end and in
not sufficient to interfere with the tread stitching.
cluding the placing of a bead ring against the
After the tread stitching operation the levers 28
shoulder and the placing of ply material about
and ‘29 are operated to cause the additional plies
the form, the improvement which comprises fold
of fabric to be folded around and under the pre 15 ing one marginal edge portion of the ply material
viously applied bead, as shown in Figs. 22, 23 and
about the bead ring by a stroking action that
24 of the drawings. Further movement of the
occurs simultaneously around substantially the
cam causes the ring El to be contracted out of en
gagement with the tire carcass, as shown in Fig.
entire circumferential extent of the bead and
vthat Jrogresses inwardly continuously ‘over the
25, whereupon the stitching ring is retracted and 20 outer side face of the bead ‘ring and axially across
the auxiliary stitching disks 39 and 48 are moved
‘the interior of the bead ring.
'
to a position outside the drum A, so‘ that the drum
5. In the 'method'of building a tire on a form
A can be collapsed to permit removal of the tire.
having a circular shoulder at one end and includ~
Upon completion of ‘this movement of the stitch
ing the placing of a bead ring against the shoul
ing elements, the cam HG will have completed its 25 der and the placing of ply material about the
revolution and the motor I64 will have been
form with one marginal edge portion of the ply
stopped by engagement of thelug 1:24 on the cam
material projecting beyond said head ring, the
HQ with the limit switch [22. '
improvement which comprises the steps of em
his to be understood that every operation i1
bracing said projecting portion and folding the
.lustrated and described in connection with the 30 entire circumferential extent thereof radially in
mechanism B is performed simultaneously upon
ward, first over the exterior ‘periphery of the
the fabric at the opposite end of the drum A by
bead ring, then over the outer side face of the
‘the mechanism C‘, so that tension of '_the fabric
bead ring, and finally over the interior periph
across the drum face is maintained at all times
ery of the bead ring, all by a single and continu
and uniform pressure is exerted throughout the 35 ous stroking action'occurring substantially simul
periphery.
taneously around substantially the entire cir
Itis to be understood that variations and modi
cumferential extent of the bead ring.
?cations 0f the speci?c device herein shown and
6.1n apparatus for building pneumatic tire
described for purposes of illustration may be
casings, an annular ‘form havinr-T an opening in
made without departing from the spirit of the 40 the end thereof and a circular shoulder surround
invention.
'
ing said opening, a substantially annular folder
What'weclaim is:
and means .for supporting and actuating the
‘1,. The method of building a tire on a form
folder to move over the form, while embracing
having a circular shoulder at the end thereof,
the latter, in an axial direction toward said end
whichincludes in combination the steps of plac 45 and then over the shoulder to fold the mar
ing ply material on .the form with a marginal
ginal edge portion of ply material on the form .
edge v?ange portion of the ply material extending
radially inwardand provide a ply ?ange extend
radially inward over the shoulder, pressing a bead
ing radially across said opening, and means for
ring axially ‘against that part of the ply flange
placing a circular head against that portion of
overlying the shoulder, and while so pressing the 50 .the ply ?ange overlying the shoulder, said ?rst
bead ring folding another part ‘of the ply ?ange
.named means being arranged to support the
against the interior periphery of the bead ring.
folder in position to vengage the ply ?ange radi
2. The method of building a tire on a form hav
ally inward of the shoulder during placing of the ’
ing a circularshoulder at the end thereof, which
bead to restrain outward turning of the ply
includes in combination the steps of placing ply. .55 ?ange.
.
vmaterial on the form with a marginal edge ?ange
'7. Tire building apparatus comprising a form
portion of the ply material extending radially in
ward over the shoulder, pressing the inner side
of a bead ‘ring against a part of the ply flange
having a circular shoulder at one end, an expan
sible-and contractible folding annulus, means for
supporting and actuating the annulus to carry
overlying the shoulder, folding another part of 60 the latter to an embracing position around the
the ply ?ange against the interior periphery of
form and to then move the annulus axially over
the bead ring while so pressing the bead ring,
the form to said end and contractingly over the
holding said other part of the ply flange against
shoulder to fold ply material inwardly over the
the interior periphery of the ‘bead ring, and While
shoulder, and means for placing a head against
soholding the folded ply ?ange pressing an outer 65 the infolded p-ly material, said first named means
portion .of the ply ?ange against the outer side
being coordinated with the last named means to
of the bead ring to further fold the ply material
support the annulus against the infolded ply ma
about the bead ring.
terial during the placing of the head to restrain
.3. The method of building a tire on a form
having a circular shoulder at the end thereof, 70
iwhich'includesin combination the steps of plac
jing .ply material ,cnithe form with a marginal edge
' ?ange portion of the ply material extendingradi
reverse movement of the ply material.
8. In apparatus for building tires, ,a device for
supporting and placing annular beads comprising
a substantially annular, resilient, expansible and
ally-inward over the shoulder, pressing the inner
contractible member for engaging the vinside of
a bead received thereon aroundsubstantially the
:side .of a ‘bead ring against a part of the ply .
.cntire circumference of the beadrsaidmemberin
2,409,974
13
unstressed. condition being slightly larger than
when disposed within a bead whereby to resil
iently and frictionally hold a received bead, a cir
cular support, ?nger elements mounted on the
support and having connection with the resilient
member to support the latter, and means dis
posed radially outward of the ?nger elements for
moving axially relative to the resilient member
against a supported bead for releasing such bead
from the resilient member.
9. In apparatus for building tires, a device for
supporting and placing annular beads compris
ing a substantially annular helical coil of resil
ient spring material, said coil being receivable
within a bead to support the latter and in un
stressed condition being of slightly larger circum
14
to the axis of the form, an expansible and con
tractible‘ fabric stitching and folding annulus
carried by said levers, an axially movable mem
ber engaging said levers for simultaneously ac
tuating said levers to expand said annulus, means
for shifting said supporting member including a
second axially movable’ actuating member, a
spring interposed between said actuating mem
her and said supporting member, and means for
operating said axially movable members to ex
pand or contract said annulus to a diameter
greater than the form and to shift the annulus
axially.
14. Tire building apparatus comprising an an
15 nular form, a supporting member coaxial with
the form and movable toward or away from an
end of said form, a series of levers pivoted to said
ference than when so received whereby to resil
supporting member at points equally spaced from
iently and frictionally hold a bead, a circular sup
the axis and extending toward said form, each of
port, ?nger elements mounted on the support and
having connection with the coil to support the 20 said levers having an arm projecting inwardly
toward the axis, an expansible and contractible
latter, means disposed radially outward of the
annulus carried by said levers, an axially movable
?nger elements and engageable with the outer
member engaging said arms, means for moving
side of a bead carried by the coil, and means for
said supporting member toward and away from
withdrawing the coil axially from within a bead.
the form, and means for moving said arm en
10. Tire building apparatus comprising a cir
gaging member away from and toward said sup
cular form having a circular shoulder at one end,
porting member to expand and contract said
folding means operative over said end of the
form to engage ply material carried by the form,
15. In a tire building apparatus a fabric stitch
including a contractible annulus engageable with
the ply material, substantially simultaneously 30 ing and folding annulus comprising an endless
annulus.
around substantially the entirecircumierential
extent of the form, and means for moving the
annulus over the form to said end and radially
inward over the shoulder to fold the ply material
against the latter and for supporting the annulus
against the folded ply material to resist unfold
ing thereof, and means for placing a bead ring
against the ply material overlying said shoulder
while unfolding of the latter is prevented by the
,
,
series of coil springs, joined end to end by plugs
having end portions ?tting within the ends of ad
jacent springs.
16. In a tire building apparatus a fabric stitch
ing and folding annulus comprising an endless
series of coil springs, joined end to end by plugs
having end portions ?tting within the ends of
adjacent springs, said plugs having helical grooves
to receive end coils of said springs and a central
groove to receive a supporting member.
annulus.
11. In apparatus for building pneumatic tire
casings, an annular form having an end shoulder,
a resiliently contractible annulus at one end of
said form which is normally of a diameter less
than that of the form, means for expanding said
annulus to a diameter greater than the form and
for releasing the same to permit it to contract,
means for moving said annulus axially in either
direction whereby it may be moved when ex
panded over the end of the form, contracted into
engagement with the drum periphery and drawn
axially over the end of the drum and contracted
radially over said shoulder, and means for yielda
bly pressing said annulus axially against said
shoulder during inward movement of the annulus .55
over said shoulder.
,
’
12. In apparatus for building pneumatic tire
casings, an annular form having an end shoulder,
a resiliently contractible annulus‘ at one end of
said form which is normally of a diameter less
than that of the form, means for expanding said
annulus to a diameter greater than the form,
‘
17. Tire building apparatus comprising an an
nular form, fabric folding and bead applying
members mounted for axial movement toward
and away from an end of said form, an axially
movable tread stitching device, means including
a motor for actuating said fabric folding and bead
applying devices, means including a motor for
operating said tread stitching device, and means
controlled by said ?rst mentioned motor for
starting and stopping the last mentioned motor.
18. The method of building a tire on a drum
having an end shoulder which comprises placing
a tubular band of ply material upon the drum
with an edge portion thereof projecting past said
shoulder, folding said edge portion inwardly to
provide a circumferentially continuous inwardly
projecting ?ange of ply material overlying said
shoulder, applying a bead ring to and holding
the same against said ?ange, folding a part of
the ?ange outwardly against the, interior of the
bead ring while the ring is so held, holding the
folded part of the flange against the interior of
the bead ring substantially throughout the cir
comprising a series of levers interiorly engaging
cumference thereof, applying a radial outward
said annulus and movable radially to expand said
annulus, a movable lever actuating member, 65 pressure to the outer part of the ply flange sub
yielding means interposed between said actuating
member and said levers, andmeans for moving
said annulus axially and for yieldably pressing
stantially throughout the circumference thereof
to fold the same against the outer face of the
bead ring while so holding the ply material
against the interior of the bead ring.
the same against said shoulder.
19. The method of building a tire on a drum
13. Tire building apparatus comprising an an 70
having an end shoulder which comprises placing
nular form, a supporting member mounted later
a tubular band of ply material upon the drum
ally of the form for movement axially with re
with an edge portion thereof projecting past said
spect to the form, a series of levers extending
shoulder, folding said edge portion inwardly to
axially toward said form and pivoted to said sup
porting member to swing radially with respect 75 provide a circumferentially continuous inwardly
2,409,974
1.5
16
projecting flange of ply material overlying said
:shoulder, applying -a bead ring to said ?ange,
andengaging said ply flange inwardly of the bead ‘ring and applying pressure thereto in an axial
outward direction substantially throughout the
than said ‘bead supporting annulus, meansfor
supporting the spring ring coaxially with said
head supporting annulus, means for expanding
said ring to a diameter greater than the drum,
for ‘moving the expanded ring axially to position
circumference thereof to fold the same outwardly
the same for engagement with a fabric bandon
Within’ the bead ring,‘ applying radial outward
the drum and for releasing said ring to permit
pressure to the p13; material within the bead ring
it to contract into engagement with the fabric
‘substantially throughout the circumference
and fold the same inwardly over the drum shoul
thereof to ‘hold the same vagainst the bead ring, 10 der, and means for moving said bead supporting
and applying radial outward pressure to portions
annulus over the contracted ring to apply the
of the ply flange projecting past the bead ring
bead ring to the fabric overlying the drum shoul
to fold the same outwardly against the outer
der.
face of the bead ring.
.
'
.
24. In a tire building machine, a tire building
drum having a bead seating shoulder, a drum
supporting shaft, a member slidably mounted on
said shaft beyond an ‘end of said drum, an ex}
2.0. ‘Tire building apparatus comprising a drum
‘adapted to receive a fabric band and having ‘a
:beadseatingend shoulder, means for folding an
edge of a fabric band on the drum inwardly
over said shoulder, means including an axially
movable bead ring supporting member for apply
ing a bead ringto the fabric overlying the shoul
der and for holding the bead ring against the
fabric, means operable while the bead ring is held
against the fabric for folding the fabric out
wardly across the interior of the bead ring, means
pansible spring ring normally of less diameter
‘than said drum carried by said member, means ‘
including a second member slidable upon said
shaft for expanding said ring, and means for
moving said slidable members, one relatively
with respect to the other to expand and release
said ring and for moving said members simul-‘
taneously to shift the ring toward or away from
the drum.
for pressing the outwardly folded fabric radially
{outwardly against the interior of the ring and for
maintaining said outward pressure substantially
.t. .. ughout ‘the circumference of the ring, and
25. Tire building apparatus comprising an an- '
nular the building form having an end shoulder
defining an .end opening, coaxial beadring sup
means operable while pressure is so applied to
the fabric ‘for folding the edge of the fabric band '
porting and pressing members movable axially
outwardly against the outer face of the bead
ring.
21.
building apparatus comprising a drum
hanging said shoulder, a fabric folding member
adapted to receive a fabric band and having a
bead seating end shoulder, means-for folding
an edge ‘of a fabric band on ‘the drum inwardly
‘over said shoulder, means for applying a bead
ring to the fabric overlying the shoulder, means
for folding the fabric outwardly across the inte
rior of the bead ring, an expansible annulus
adapted to be positioned within bead ring, means
for expanding said annulus to press the fabric
against the interior of the bead ring, a second
expansible annulus adapted to be positioned
within the projecting edge of the .fabric band,
and means for expanding said second annulus
to fold the fabric against the outer face‘of said
bead ring.
22. In apparatus for building pneumatic tire
casings, an annular form having an end shoulder,
.an .expansible and contractible annulus concen
tric with the drum and mounted adjacent thereto
for movements radially inwardly and outwardly
across said shoulder, means for moving said an
nulus axially to position the same around or
within edge portions of ply material projecting
beyond said shoulder, means for expanding or
contracting saidannulus to fold the ply material,
and means for yieldably pressing said annulus
ax'ia‘lly'against material overlying said’ shoulder
during radial movements of the annulus across
said shoulder.
‘
23. In a the building machine, a tire building
drum having a bead positioning shoulder, a bead
supporting annulus coaxial with the drum mount
ed for movement toward and away from said
shoulder, fabric folding means comprising a
spring ring that is normally of smaller diameter
of the form for applying a bead to fabric over
mounted for axial movement from a position
within the drum into engagement with the fab
35
ricadjacent the shoulder substantially through
out its circumference, means for actuating said
supporting and pressing members to apply the
bead ring and for withdrawing said supporting
member, from the bead ring while the bead ring
is held against said shoulder by the pressing mem
ber, .and means for moving said fabric folding
member outwardly to fold the fabric radially out
_-wardly against the interior of the bead ring
while the bead ring is .held by ‘the pressing mem
‘ber.
'26. Tire building apparatus comprising an an
nular tire building form having an end shoulder
de?ning an end opening, a shaft extending
through the opening into the interior of the '
form,_a fabric folding member mounted foraXial
movement on the shaft inwardly and outwardly
through said opening, said member having a
peripheral portion for engaging the fabric ad
J'acent said shoulder, an annular bead presser
mounted onsaid shaft for movement toward and
away from said shoulder, a bead ring support
telescopically mounted within the presser, means
for moving said support and presser toward said
shoulder to apply a bead ring to fabric on the
form and overhanging the shoulder, and means
for moving the bead ring support outwardly from
within the bead ring while the bead ring is pressed
against the shoulder by said presser, and for
moving said fabric folding member outwardly to
fold the fabric radially outwardly against the
interior of ‘the bead ring while said bead ring is
held by said presser.
'WALTER, J. BRE'I‘H.
ROBERT M. WORMALD.
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