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Патент USA US2404449

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July 23, 1946.
cl vs. MccHEsNE-Y I
‘ 2,404,449.
AUTOMATIC TIRE STITCHING MACHINE
8 Sheets-Sheet 1
Original Filed Oct. 3; 1942
N.6
N,T.
.
INVE’NT'OR
Cu r1 ER 5, Mo CHESNEV.
‘
BY
July 23, 1946.
ll
_
'
2,404,449
C. ‘S. MPCHEISNEY
_ AUTOMATIC TIRE STITCHING MACHINE
Original Filed Oct. 3, 1942‘
j 8 Sheets-Sheet 2
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IN VEN TOR.
ATTORNEY
July 23, 194.6. _
c. “s. MGCHESINEY
7
2,404,449.‘ I
'AUTOMATIC TIRE STITCHING MACHINE
Original Filed Oct. 3, 1942
8 Sheets-Sheet 3
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July 23, 1946.
c. $(MOCHESNEY
2,404,449
AUTOMATIC TIRE STITCHING MACHINE
Original Filed Oct. 5, 1942
8 Sheets-Sheet 4'
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INVEN TOR.
CUVL E4? 5. Mt.‘ Chas/YE)’.
BY
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A TTORNEV
July 23, 1946.
C. S. MCCHESNEY‘
AUTOMATIC TIRE STITCHING MACHINE
Original Filed Oct. 3, 1942
7,
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July 23, 1946. I
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C. S. MOCEIESNEY
2,404,449 I
v AU'roMATic TIRE STITGHING MACHINE
Original Filed Oct. 5, 1942
8 Sheets-Sheet 6
' July 23, 1946. .
2,404,449
c. s. MCCHESNEY
AUTOMATIC TIRE STITCHINQ MACHINE
Original Filed Oct. 3, 1942
8 Sheets-Sheet 7
an?,‘
IN VEN TOR.
BY
A TTOR/V E Y
July 23, 1946.
.Y
c. s. MCCHESNEY
7
2,404,449
AUTOMATIC TIRE STITCHING MACHINE
Original Filed Oct. 3, 1942
a sheets-sheets
‘
ATTORNEY
Patented July 23, 1946
2,404,449
UNITED * STATES PATENT OFFICE‘
.
2,404,449
AUTOMATIC TIRE STITCHING MACHINE
Cuyler S. McChesney, Kenmore, N. Y., assignor to
Dunlop Tire and Rubber Corporation, Buffalo,
N. Y., a corporation of New York
/
>
Original application October 3, 1942, Serial No.
, 460,705, now Patent.No. 2,394,464, dated Febru
ary 5, 1946. Divided and this application No
vember 18, 1944, Serial No. 564,159
15 Claims.
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.
(Cl. 154—10)
2
1
part of the driving
My present invention relates to an automatic
tire tread stitching machine, that is, to one in
which the tread of a tire after being placed in
position on the underlying fabrics is pressed or
the invention is applied and a
rolled by disks which pass from a mid line of the ~
mechanism relative to the drum.
tread outwardly to the edges from whence they
and control mechanism.
' Fig. 2 is a'plan view of the mechanism shown
in Fig. 1, showing the position of the ‘stitching
I
'
Fig-3 is a vertical section taken on line 3—3
of Fig. 4 through the driving and control mecha
nism for the‘drum and showing the control de
vices for the stitcher mechanism.
The present application is a division of my co
Fig. 4 is a section through the driving and con- '
' pending application Serial No. 460,705, ?led Oc 10
trol mechanism taken on line 4—4 of Fig. 3.
tober 3, 1942, for a Tire building machine, now
Fig. 5 is a vertical section of the driving and
Patent No. 2,394,464, dated February 5, 1946.
control mechanism taken on line 5—5 of Fig. 3.
In building a tire carcass on a ?at drum layers
Fig. 6 is a longitudinal sectional view of the
of bias cut fabric are wrapped on said drum with
_
the threads of one layer at an angle to those of 15 stitcher and driving mechanism.
Fig. 7 is a side view on a larger scale of ‘the con
the underlying and. overlying fabrics, thereafter
trol mechanism for the stitcher. '
breaker and chafer strips are applied and, ?nally,
Figs. 8 and'9' are respectively sectional views of
a tread strip is wrapped on the assembled fabrics
the stitcher control mechanism taken on lines '
midway between the ends of the drum. To unite
t
the rubber of the tread strip to the fabric on 20 8—8 and 9-9 of Fig. '7.
Fig. 10 is a wiring diagram showing the elec
which it is wrapped it is pressed by a pair of
tric circuit for the control of the various elements.
circular disks which bear against the outer sur
In the tire building machine shown in the ac
face of the tread strip and as the drum is rotated
companying drawings and embodying a preferred
the disks rotate circumferentially of the drum
while they are gradually separated to the edges 25 form of the invention, the mechanism is mounted
on a base II having a housing I2 ‘for the'drum
of the tread strip. After the tread is thus united
with the underlying fabrics the drum is collapsed
driving and control mechanisms, said base hav4
ing an extension I3. A‘ forming drum- I4 is
and the carcass shaped in a suitable mold.
In the tire building machine of my previously
mounted over the extension I3 on a hollow rotat
mentioned Patent.No. 2,394,464, the drum is ro 30 ing shaft I5 and an internal shaft I6 which ‘pro
ject from the housing I2 and are driven by a
tated and the various tire elements brought into
motor I1, Fig. 3, within the housing I2, through
position thereon in sequence timed by a timer
a pulley I8 on the motor to a driving belt I9 and.
rotated by the drum rotating mechanism and also
a pulley 20 on the inner shaft I6.
‘
by a series of manually operated control levers.
The shaft I5 is supported by the shaft I6, one
While my present invention is particularly
end of which is journaled in roller bearing 2 I, and
suited to the machine shown in said co-pending
by the roller bearing 22. The inner and outer
application, it is applicable to any tire forming
shafts I5 and I 6 may be stopped by means of
machine in which a tread is to be stitched to the
brakes 23 and 24 respectively for the purpose of
underlying fabric.
In my present invention the stitching is auto 40 expanding or collapsing the drum. The various
vmechanisms are controlled by means of ‘a timer
matic so that it is only necessary for the operator
25 driven from the shaft I6 through gears‘26 and '
to press a control lever whereupon the rotating
are removed from the tread and returned to their
original position.
disks are brought under pressure against the
outer surface of the tire tread strip while the
drum is rotating so as to cause the disks to rotate.
about the circumference of the drum and these
disks are then slowly and uniformly separated
while rotating until they reach the outer edges of
21 and a, shaft 28.
p
_
The various fabrics of a tire carcass are built
' up on the drum I4 and the tread is then wrapped '
about the drum and stitched in position thereon
by the stitcher mechanism of the present inven
tion.
'
the tire strip, whereupon they are automatically
This. stitcher mechanism comprises a pair of
withdrawn from contacttherewith and returned 50 rollers or disks 29 and 30 having hubs 3| and
32 slidably mounted on a hollow supporting
to their original position.
shaft '33 which is mounted at its ends in a suit
The various features of the invention are illus-_
trated by way of example in'the accompanying
able bracket‘34, Fig. 6. The bracket 34 ‘come
prises an arm 35keyed onto a shaft 36 journalled
drawings in which
Fig. l is a side elevation'of the drum to which 55 on a standard 31 and has a pair. of branches
2,404,449
3
4
.
38 and 39 extending parallel with the surface of
covered by a suitable cover ‘I2.
the drum and then turned at right angles to form‘
the supporting ends or heads 40 and M for the
end of the shaft 69 is mounted in a suitable bear
ing 73 on the part 4.9 of the bracket 34. The
shaft 69 is connected through a train of gears
hollow shaft 33[
.
.
The shaft 43615 a. hollow rockshaftjournalled
in a suit‘ablebearing. 43in the standard? 31 and
in a bearing in the wall of the housing I2.
7 Within the housing I2 an arm 44 is rigidly I
The opposite
14,;15-and ‘I5 toa drive shaft ‘I1 journalled in
and’extending'tlirough.the‘ rock shaft 36 into the
housing I2.
The shaft 1‘! is driven from an in
dividual motor ‘I8 within the housing l2, Fig. 7,
secured or keyed to the shaft ‘36 and its free
end is connected, as shown in Figs. 4» and 5, to
through a belt ‘I9 connecting the pulley 80 of the
motor to a pulley 8| mounted on the projecting
the end of a piston stem 45 extending into. a.v '
end ofthe shaft 11.
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pneumatically operated cylinder 46- »which. isv
The shaft 'I‘I~also drives a limiting device for
pivoted to a rib 41 in the housing I2.
limiting the travel of the stitcher disks 29 and
When actuating fluid under pressure is ad
‘30. This limiting device comprises a screw
mitted to the left end of thepiston as‘ shown 15' threaded shaft" 81 mounted in bearings 88 and
in Fig. 4, or at the right-hand: as: shown inFi'g:
89. suspended. at spaced intervals from a cross
5, forcing the piston rod 45 out of the cylinder,
beam. 9.8. The shaft 81 is driven from the shaft
it rocks the shaft 36 clockwise as viewed in'Fig.
11 through a pinion'9l keyed to the shaft 1'!
and meshing with a gear 92 keyed or pinned
5, and thus brings the edges of the stitcher'disks
29 and 30 into contact with the edge of the .20 on the screw shaft 81. The shaft 8'! is there
by rotated in fixed relation to the. shaft ‘Hz.
Contact with the tread. causes: the stitcher.
Ar nut 93‘is1v threaded on: the shaft Wand-is
provided with .a- groove Mingus-upper‘ edge which
disks to rotate on the shafti331 with a1 pressure
that is' controlledby't-he pressure-fluid admitted
receives a guide'bar' 95-secured;to the'lower sure
to the cylinder 46; The disks Z9 and-30 are-mov 25 faceof the cross-beam 90 to prevent the nuttfrom
able longitudinally on. the‘shaft 33 and in order
rotating. As the shaft’llfl' is: rotated iii-one. direc?
to enable them tofollow the contour of the tread
tion or the other the/nut: 93' moves infa= corre
the arm 35 of. the. bracket 34-: is' made in. two
sponding direction lengthwise of‘ theshaft 8:1. '
parts, a lower part 48- being keyed: directly to
The nut. 93- isprovided with a sidewise. extending
the shaft 36; and an upper'part 49 carrying the
cam 96', as shown particularly in Figs. '7 and 8.
arms 33 and 39, being secured to a pivot pin'
which engages and lifts a lever arm 9‘! of a: limit
50- by means of a screw 51, or other suitable
ing switch 98 or alever 990i alimit switch IIIII';
means; which: extends into. a- suitable- recess in
When the motor 18 is to be started the. nut 93-’wil1
the lower part Y48 and is:.rotatably locked: therein
be below one of the levers 91'or’99; depending
by a pin 52 engaging a‘ recess Win the’ pivot pin. 35 upon the direction in which. the disks 29* and .38
50. In' this way the upper branched: part is
and,v correspondingly; the shaft. 8:1,- is- to. rotate.
secured ‘to the lower: supportingi part 48 to per
As the disks 29 and.30 andfshafts‘l‘rotate, the
mit the branches 38 and 39' to tilt, this tilting
nut 93 is threaded forwardly on’ the. shaft 8'Tuntil
of the-branches on‘ the. axisof. the pin. BI'IIbeing
it contacts with, and’lifts, the other of‘ the-levers
limited by any suitable means'notsshown.
91> andv 99,.whereupon'. the corresponding switch
The; disks 2.9 and ‘30 are substantially‘ inyc'on
acts .to reverse the motor ‘i8 and; accordingly; the
tact face to face andat- about». the: mid-line:- of
nut'93 threads its way backto‘it‘sroriginal position
tread.
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I the forming drum as they are broughtginto con
tact with the latter.
They are then. caused to
separateto a. predetermined distance: while ro- I
tating in‘ contact with the surface of the; tread
j and upon‘ further rotation are- brought together
and, lifting the corresponding switchlever, opens
the'jcircuit contact. to the motor l8v which; there
upon stops;
'
‘
'
In order to prevent the shaft 81' from‘ overrid
ing its position‘, a suitable resistance to rotation
‘ after. they havebeen tiltedt out: of contact. with
maybe provided bymeans of abrake drum IIlI
the tread.
keyed on the shaft 81' and engaged by a. ?exible
The diskgs' 29.; and 30 are moved longitudinally 50 brake band I02 secured, atone end-on the cross
on- the shaft 33‘ by means. of a ‘screw shaft: 54
beam 9?and at the other end to a rod Illmwhi'ch
extending lengthwise’ within'rthe hollow shaft. 33
is resiliently pressed upwardly by means‘ of "a
and rotatablyv mounted in. bearings. 5-5 and. 56
spring I04 con?ned between'rt'he beam 9i]: and're
I in the heads 38 and‘ 38'of the bracket. Thescrew I
taining nut I051
‘ shaft 54_ has left-hand and. right-hand screw 65
threads 51' and 58 extending fromzitsmid point.
‘ On the screw’ threads '51 and‘ 58 arermounted a
The switches 98 and‘ I00 are mounted onblocks
I06: and Hi‘! Which are slidably mounted on an
upwardly projecting web of ‘the beam 95' and may I
pair of nuts ‘59 and 60 which. are held from. ro
tationby means of projections BI and 62 which
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be secured in any desired position ‘by. means of
a set screw I09. The switches‘ may. thereby be
extend. through a. longitudinal. slot 53,. Fig. 6; 60 adjusted to provide any desired interval between
in the shaft 33' and enter inner annular: grooves
the starting andistoppi'ng of the motor 18" and
64 and 65 of the hubs 3 I. and 32...
‘
the stitching disks 29 and 30.
When the shaft 54 is rotated in one direction
The electric circuits for controlling the above
the nuts. 59 and 60 are pushed inopposite direc
mechanism are shown in- the wiring diagram of
tions' from the‘mid point of the screw and the
Fig. 10. In this diagram current is supplied from
projections‘ BI and 62' will. carry the- respective
the mains III) and' III. At the time that the
stitcher disks 729‘ and 30'while permitting these
tread stitcher operates the drum I4'rotates at a
disks to rotate. The screw shaft 54 extends
high speed. To start the rotation of the» drum
through the end of. the bracket 38 and carries
motor II a switch I I2 is'closed thereby closing a
aspro'cket EBIk-eyed’ onto, the projecting. end of 70 circuit through a wire “3 to a branch‘wire' H4
the", screw- shaft and connected by means of a
and the high speed starting mechanism for the
motor II. This starts and rotates the drum I4
end of a shaft 69- mounted in a suitable. bear
at a high speed.
j ingv 102m: 'anear ‘H on.thebracket branch 38-. I
The switch H2 is connected to a switch “5 in
The. sprockets 66, 68‘, and the chain 6T are; 76 a branch circuit H6‘ in such manner that the
chain; 6.1,‘ Fig... 6, to a sprocket ‘68-. keyed to the
2,404,449‘
6
5.
7 switch I I5 is normally closed when the switch
I I2 is open and is opened when the switch H2
is. closed. Normally, therefore, current passes
through the branch circuit H6 and the closed
switch II5 to an electromagnet Ill and thence
through a wire H8 and the outilimit switch 98
which is closed at the start of the stitcher mech
anism.
is moved back until it opensthe in limit switch
I90.
'
Inasmuch as the switch I25 has been opened by
the release of pressure on the bracket 34 the open
ing of the in limit’ switch I00 breaks the circuit
through the motor ‘I8 and the control device I29,
thereupon the motor stops as the disks reach
their 7 original position as indicated in broken
lines in Fig. 6.
~
The energizing of the electromagnet II‘I also '
It will be understood that the above wiring is
closes a switch II 9 in a shunt circuit I29 thus 10
maintaining 'a circuit through the electromagnet
purely diagrammatic and that other wiring ar
'I I‘! after theswitch I I5 is opened. '
rangements might be made.
The energizing of‘ the electromagnet II'I also
»
Through the above apparatus the tread is given
a uniform predetermined stitching which may be
from the branch II 3 through an electromagnet 15 adjusted by adjustment of the position of the
switch 98 for any width‘ of tread. The stitching
I23, which controls a valve I24 for the admission
continues uniformly from the mid point of the
of pressure ?uid to the cylinder 46 entering at
tread to the outer limit for which the mechanism
the left end of the cylinder as viewed in Fig. 4.
is setrand upon reaching this predetermin'ed'outer
This rotates the disk carrying bracket 34 to bring
the disks 29 and 30 against the surface of the 20 limit is withdrawn and returned to its original
position without requiring attention by the oper
tread with a pressure governed by the pressure
?uid admitted to the cylinder 45. At the same i ator. It is only necessary for the operator to close,
the switch H2, or operate a mechanism for clos
time it closes a pressure actuated switch I25 in a
ing it as described in my previously mentioned
branch circuit I29 leading from the main III)
Patent No. 2,394,464, whereupon the stitching of
through the windings or control mechanisms of
the tread will be accomplished without such vari
the stitcher motor ‘I8 setting this motor in opera
ation as might occur if the operation were con
tion.
trolled by the operator. The result is that the
The direction of the motor is‘ controlled by a
stitching for each tread is uniform without dan
branch circuit I21 leading from the branch cir
cuit I22 through a solenoid I28 which controls 30 ger of falling short of the edge of the tread or
overrunning this edge.
‘
a reversing and starting mechanism I 29. Cur
What I claim is:
'
rent is supplied to the starting mechanism
1. -A tread stitcher for stitching tread on a tire
initially through the branch circuit I28 and the
carcass on alrotatable forming drum which com
pressure switch I25 and a connecting shunt I39.
prises a shaft, a pair of stitching disks rotatably
The shunt I 30; connects with a branch circuit I3I
and slidably mounted on said shaft, means to
which‘ is closed by an in limit switch I99. The
move said shaft to bring the peripheries of said
current'is supplied initially through the circuits
disks against the tread on said forming drum,
I26, I30 and HI until themotor is started and
means to slide said disks toward and from each
the disks separate whereupon the in limit switch
other on said shaft, control means comprising an
I88 closes and current then ?ows directly from
electric circuit having a pair of cam operated.
the main III! to the control mechanism I29.
switches to control the direction and extent of
The control mechanism I29 comprises a pair
movement of said disks, a cam for operating said
of branch circuits I32 and I33 connected to each
closes a switch I2I in a branch circuit I22 leading
other through a reversing circuit I34 and con
nected alternatively to the circuit I3I by switches
I35 and I36 operated by the solenoid I28 in such
a manner that one is closed when the other is
opened.
switches and means to move said cam to and
from said switches in proportion to the move
ment of said disks.
2. A tread stitcher for stitching tread on a tire,
carcass on a rotatable forming drum which com
prises a shaft, a pair of stitching disks rotatably
The circuits I32 and I33 are connected to a
return circuit I31 leading to the main I II by 50 and slidably mounted on said shaft, means to
move said shaft to bring the peripheries of said
means of a pair of switches I38 and I39 which
disks against the tread on said forming drum,‘
are also controlled by the solenoid I28 and op
means to slide said disks toward and from each
erate in the reverse of the switches I35 and I35.
other on said shaft, control means comprising an It will be apparent, therefore, that when the
solenoid I28 is energized current will flow through 55 electric circuit having a pair of cam operated,
switches to control the direction and extent of
one of the switches as, for example, I35, thence
movement of said disks, a cam for operating said
in one direction through the control circuit I34
switches, means to movelsaid cam to and from
and through the switch I39 to the branch I31
said switches in proportion to the movement of
and main I I I. This continues until the out limit
switch 98 is opened whereupon the circuit through 60 said disks and means to adjust the positions of
said switches relative to the path of movement
the electromagnet II‘! is opened, opening both of
of said cam.
,_
the switches H9 and I2I. This breaks the circuit 4
3. A tread stitcher for stitching tread on a tire
through the electromagnet I23of the ?uid con
carcass on' a rotatable forming drum which com‘- »
trol valve I24, reversing the position of this valve,
prises a shaft, a pair of stitching disks rotatably
whereupon the bracket 34 falls away or is with
and slidably mounted on said shaft, fluid actuated
drawn from the drum I'4.
means to move said shaft and disks toward and
Also the circuit is broken through the solenoid
from the forming drum to bring the peripheries
I28 opening those sWitches in the control mech
of said disks against said tread. means to slide
anism I29 that were closed and closing those that
said disks toward and from each other on said
were open and thus reversing the current through
shaft. control means comprising an electric cir-y
the control coil I34. Thereupon the direction of
cuit having a pair of cam operated switches to
rotation of the motor ‘I8 is reversed, reversing the
control the direction and extent of movement of
rotation of the shaft 81 and the screw shaft 54.
said disks and the admission of ?uid to said ?uid
The disks ar'e,_therefore, returned to their origi
actuated means, a cam for operating said switches
nal central position at the same time the cam 96
2,404, 4A9.
7
'8,
and; means, to move said cam to and from said
and gearing connecting said screw-and said rotate
switches in proportion to the movement of said
able shaft to rotate ‘ in?xed relation.
disks.
'
'
'
"
4. A tread stitcher for stitching tread on a tire
carcass on, av rotatable forming drum which com
prises a bracket having, a stem and a pair of
arms, aisupport for said bracket to permit said
bracket to rock to andfrom said drum and about
the axis of said stem, a shaft mounted between
'
8. A tread stitcher for stitching tread, orra tire
carcass on a rotatable forming drumrwhichcomi-y
prises a bracket pivoted to swing toward and'from
said drum and having a pair of arms, a rotatable
screw threaded shaft mounted on and between
said arms and threaded oppositely from the; mid
point of said drum, a supporting shaft, a pair, of
thearms of'said bracket, a pair of stitching disks 10 disks rotatable and slidable on said supporting
rotatably'and slidably mounted on said shaft,
shaft, nuts threaded, on, said, rotatable screw
means to slide said disks‘to and from each other
threaded shaft each rotatably engaged by'one‘of
on said shaft, control means comprising an elec-.
said disks, an electric ‘circuit comprising means
tric-circuit having a pair of cam operated switches
to control the direction and extent of movement
to drive said threadedshaft forwardly and in re
of‘‘ said disks, a cam movable to operate said
switches alternatively and" means to move said
cam’ to‘ and-from, said switches in proportion to
' verse and having a pair of spaced starting; and
reversing switches, a cam movable to operate said
switches alternatively,,a screw engaging said cam,
gearing connecting'said screw‘ and said rotatable
the movement‘ of said disks on said shaft,
shaft to rotatev in ?xed relation, ?uid" operated’
~ 5. A tread stitcher for stitching tread on a tire
carcass on‘ a rotatable forming drum which com
means to tilt said bracket toward and‘ from said
drum and means in said circuit to control the ad;
mission of ?uid to and its exhaust from said ?uid
prises a shaft substantially parallel to-the axis
‘ = of rotation of said drum, a pair of disks rotatable
on said shaft‘ and slidable thereon to and from a
position substantially midway of‘ said tread, a
shaft threaded oppositely from a mid point, a
pair: of nuts one for each disk threaded on. said
oppositely threaded parts of’ said shaft and mov
able-toward or from each other as said shaft is
rotated forwardly- or in reverse, said disks ro 30
tatably engaging their respective nuts, an elec
operated means.
9. In a tire building, machine a rotatable; drum;
' a pivoted bracket having a hollowshaft parallel
to the axis of said drum and having a longitudi
nal slot, a pair of disks rotatable and slidable on
said shaft, means to tilt saidbracket tobring the
edges of said disks into engagement with the sur-'
face of said drum, a rotatable screw within said
shaft and threaded oppositely from the central
tric circuit having a pair of spaced cam operated
plane of said drum, nuts, one for: each disk;
switches‘ one, to limit the outward movement-and
threaded on said screw on opposite sides of said
the other the inward movement of said disks, a
plane and projecting through the slot of said
screw driven synohronouslywith said shaft and 35 shaft to said respective disks to move said diskstio
a cam threaded on said screw to operate said
and from each other'by the rotation of. said screw
switches‘ alternatively in its movement on said ' relative to said nuts andmeans to limit rotation
SCI'GW.
of said shaft and separation of said disks, said
6. Atread stitcher for stitching tread on, a tire
means comprising a screw rotatablein de?nite
carcass on a rotatable forming drum which com; (0 relation to said ?rst screw, electric. circuits com
prises a bracket tiltable to and from said drum,
prising adjustably ?xed contacts, and‘ a nut
a shaft mounted on said bracket substantially
threaded on said second screw- in position to close
parallel‘ to; the axis of rotation of said drum, a
and open said contacts.
_
pair of disks rotatable on said shaft and slidable
10. In a tire building machine a rotatable form
thereon to and from va position substantially midg 45 ing drum, a pair of stitching'disks freely'rotatable
wayof said tread, a shaft on said bracket threaded
on an axis parallel to that of said drum, rotatable
oppositely from a mid point, a pair of nuts one
means to separate and return said disks, a screw
for each disk threaded on said oppositely threaded
rotating in ?xed relation to said rotating sepa
parts of said‘ shaft and movable toward or‘ from
rating means, a nut threaded on said. screw'and
each’ other as said shaft is rotated forwardly or 50 held against rotation to move in one direction or '
in reverse, said disks rotatably engaging'said nuts,
the other as said screw is rotated in one direction
an. electric circuit comprising means to start and
or the other, ?xed switches in the path of said
reverse therrotation of said shaft and the tilting
nut to be closed by contact therewith and electric
ofv said bracket toward and from said drum and
circuits closed by said respective switches to re
having a pair of spaced cam operated switches to 55 verse and to stop said disk moving means.
start and reverse therotation of said shaft, a
11. In a tire building .machine, a rotatable
screw driven synchronously with said shaft, and
forming drum, a pair of stitching disks freely ro
a’ cam threaded on said screw to engagesaid
tatable on an axis substantially parallel to that
switches alternatively in its- movement on said
of said drum, rotatable means to separate and
screw.
‘
60 return said disks, a movable switch actuating
7. A tread stitcher for stitching tread on a tire
member, means to move said member back and
carcass on a rotatable forming drum which com
forth in ?xed relation to the positions of said
prises albracket pivoted to swing toward and from
disks and a circuit controlling the movement'of
saidwdrurn andhaving a pair of arms, a rotatable
said disks and comprising spaced switches actu
screw’ threaded shaft mounted on and between 65 ated by said switch actuating member tostop and
said arms’ and threaded oppositely from the mid
start the movement of said disks.
'
‘
point of said drum, a supporting shaft, a pair of
12; A- tread stitcher for stitching elements of
disks rotatable and slidable on said supporting
a tire carcass on a rotatable forming drum which
shaft, nuts threaded on said rotatable screw ' comprises a shaft, a pair of stitching disks rotat
threaded shaft each rotatably engaged by one of 70 ably and slidably mounted on said shaft, means
said disks, anelectric circuit comprising means to
to move said shaft to bring the peripheries of
drive said threaded shaft forwardly and in re
said disks against the carcass on said forming
verse and having‘a pair of spaced starting and re
drum, means to slide-saiddisks toward and‘from
versing switches, a cam movable to operate said
each- other on said shaft, and controlmeans-com
switches alternatively, av screw engaging said cam, 75 prising: an: electric, circuit, anv electromagnet; in
7 (2,404,449
i
said circuit to control the movement of said shaft;
toward and from said drum, a branch circuit to
control ‘the disk sliding means, a pressure switch
in said branch circuit actuated by pressure of said
disk against said drum to energize the disk sliding
means, means to move said disks from each other,
an out limit switch to reverse said disk sliding
means and to reverse the electromagnet control
t
10
the outward movement and the other the inward
movement of said disks, a screw driven synchro
nously with said shaft and a cam threaded on
said screw to operate said switches alternatively
in its movement of said screw.
14. A tread stitcher for stitching tire elements
on arotating forming drum which comprises'a
pair of stitching disks, means to advance‘ said
disks into edgewise pressure engagement with the
ling the movement of said shaft toward said drum
and an in limit switch to stop the disk sliding 10
tire elements on said drum and reversely away
from said drum, means to move said gdisks from
13. A tread stitcher for stitching elements on a
mid position outwardly toward the opposite ends
tire carcass on a rotatable forming drum which
of said drum and reversely, a control cam’v and
comprises a shaft substantially parallel to the
means to move said cam in one‘direction with,
axis of rotation of said drum, a pair of disks ro
and in proportion to, the outward movement of '
tatable on said shaft and slidable thereon to and
said disks and reversely, and an electric control
from a position substantially midway of said
circuit comprising a starting switch, means to
tread, a shaft threaded oppositely from a mid
control
said disk advancing means on'*actuation
point, a pair of nuts one for each disk threaded
on said oppositely threaded parts of said shaft -' of said starting switch, a pressure switch actu~
ated on pressure engagement of said disks against
and movable toward or from each other as said.
said
drum and controlling the outward movement
shaft is rotated forwardly or in reverse, said disks
of
said
disks, an out limit switch actuated by said
rotatably. engaging their respective nuts, an elec
cam to reverse said disk advancing means and
tric circuit having means actuated thereby to ad
said disk moving means and an in limit switch
vance said disk carrying shaft toward said drum
actuated by said cam to stop said reverse move- '
to press said disks edgewise against the peripheral
ment of said disk moving means.
7
surface of said drum, a pressure actuated switch
15. The tread stitcher of claim 14 and a circuit
actuated on the pressing of said disks against said
means.
7
-
>
peripheral surface to actutae said threaded shaft
and a pair of cam operated switches, one to limit 30
controlled by said starting switch to control the
rotation of said drum.
>
}
'
CU'YLER S, McCHESNEY.
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