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Патент USA US3044737

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July 17, 1962
E. HOLROYD ETAL;
APPARATUS FOR SUPPLYING SHEET MATERIAL
TO A TIRE BUILDING MACHINE
Filed April 28, 1959
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3,044,727
2 Sheets-Sheet 1
lW
July 17, 1962
E‘ HOLROYD ETAL APPARATUS FOR SUPPLYING SHEET MATERIAL
TO A TIRE BUILDING MACHINE
Filed April 28, 1959
3,044,727
2 Sheets-Sheet 2
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22/
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hired States Patent
Free
3,044,727
Patented July 17, 1962
1
2
One embodiment of the invention will now be described,
3,tl~l4,727
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by way of example, with reference to the accompanying
APPARATUS FUR SUPPLYING SHEET MATERIAL
TO A TIRE BUILDING MACHINE
Eric Holroyd, Sutton Cold?eld, and Felix Walter
drawings in which:
,
FIGURE 1 is a partly cross-sectional side elevation of
part of a tire building material supply‘ turret and part of
Waldron, Streetly, England, assignors to Dunlop Rub
ber Company Limited, London, England, a British
a tire building former;
company
'
-
FIGURE 2 is an enlargement of a portion of FIG
Filed Apr. 28, 1959, Ser. No. 809,509
URE 1.
>
Claims priority, application Great Britain May 7, 1958
A turret I mounted on a vertical axis 2, carries within
4 Claims. (Cl. 242—67.3)
10 a supporting framework 3 a plurality of pairs of rolls
This invention relates to apparatus for supplying sheet
4 and 5. The rolls 4 carry a continuous length of rub
tire-building material to a tire building machine.
berised ply fabric 6 interleaved with a lining material 7
Apparatus for supplying sheet tire-building material
which serves to separate adjacent faces of rubber-ised
fabric. The roll '5 of each pair is utilised to take up the
to a tire building machine is known which comprises rolls
of bias-cut rubberised ply fabric interleaved with lining
lining material 7 as the ply fabric 6 is unwrapped from
material supported on a frame-work, each roll of fabric
the roll 4.
having an associated spool for taking up the lining ma
terial as the ply fabric is’unrolled. In use, the operator
supported at their ends by a pair of horizontally disposed
The rolls 4 and 5 are mounted on axles 8
endless chains 8a, passing over sprockets 8b at each end
draws the ply from the appropriate roll by pulling upon
of the turret frame. The sprockets are rotatable by a
the ply to‘ draw its leading edge into position on the 20 motor (not illustrated), step-by-step, into a series of posi
surface of an adjacent tire building former. The leading
tions to bring any pair of rolls into a convenient operating
position adjacent to the tire-building former 9.
edge of the ply fabric is adhered to the former surface
A guide tray 10 is located between the turret 1 and
the tire-building former 9 and has a guide surface 11.
and the former rotated for a complete revolution to draw
the ply fabric from the roll and wrap it around the entire
circumference of the former. The ply fabric is then torn
The guide tray is provided at its ends with freely rotatable
in a position to make a lap joint at the ends of the ply
on the former and the surplus fabric is drawn back onto
the roller for further use by rotating the fabric roll.
rollers 12 and Y13.
.
A pair of spaced-apart levers 14 are mounted between
the ply guide tray 10 and the turret, the levers being
When bias-cut ply fabric is drawn by the operator
freely rotatably mounted on a common axis 15 which pass
onto the former, and also when the fabric is drawn by 30 es through the levers at one end thereof. The other
end of each of the levers supports a roller 16 (herein
the former itself, from the roll, undesirable stretching
after called a dancing roller) so that, in its normal posi—
and ‘distortion of the fabric takes place and this results
tion, a length of ply material 6 passing between any one
in a tire construction which does not conform to the,
of the rolls 4 on the turret carrying ply material and the
requirements of the tire designer and which will not,
35 roller 12, is de?ected by the dancing roller 16 from the
therefore, give the desired performance.
It is an object of the present invention to provide
position 6a (shown dotted) of the ply 6 in which it
forms a common tangent between the said roll 4 and ply
apparatus for supplying sheet material which will con
guide tray roller 12.
siderably reduce the undesirable stretching and distortion
The lever 14 shown in the drawing has an additional
which takes place when the apparatus referred to above
is used.
.
40 arm 17, this lever thus being a bell crank lever.
The ad
ditional arm 17 is provided with an adjustable head 17a
According to the invention apparatus for supplying
sheet tire building material to a tire building machine
in the form of a screw in engagement with a screw-thread
ed hole in the arm. The arm is pivotally connected at a
comprises a roll for carrying the sheet material, an elec
point 18 along its length to the movable core 19 of a
tric driving motor for rotating the roll, a movable mem
ber for engagement with a length of the sheet material 45 transducer 20. The core of the transducer is located in
its axially outermost position with respect to the trans
to cause de?ection of the sheet material between the roll
ducer coil 21 When the length 6 of ply material is fully
and the tire building machine, said member being mov
able upon straightening and de?ection of the length of
de?ected and the arm 17, when in this position, also con
tacts a micro-switch 22 so as to close a circuit for the
material, and electrical means for controlling the speed
_
of rotation of the motor and actuated by the member so 50 purpose to be later described.
A DC. electric driving motor 23 is mounted on the
that the greater the degree of movement of the member
turret frame 3 and is mechanically connected to a reduc
upon straightening of the de?ected length of material,
tion gear-box 24. A rubber-surfaced driving roller 25 is
the greater the speed of rotation of the motor.
rotatably mounted between the ends of a pair of arms 26
In a preferred embodiment of the invention the mov
able member comprises a bell crank lever pivoted at the 55 which are pivotable at their other ends on brackets 27 at
tached to the turret frame. A sprocket 32 is mounted on
junction of its arms, one arm carrying at its free end a
the output shaft 33 of the reduction gear box 24 and is
roller for engagement with the material from the roll and
inter-connected with a sprocket 34 at an end of the ‘driv
the other arm being connected to the electrical speed
ing roller 25 by means of a chain 35, the electric motor
controlling means. In the preferred embodiment this’
means comprises a transducer connected to apparatus for
60
23 thus driving the roller 25 through the gear-box 2.4,
sprockets 32 and 34 and chain 35.
The driving roller 25 is movable into and out of driv
ing contact with any one of the rolls 5, the rubber sur
face of the roller 25 serving to prevent or limit slip when
engaging the outer peripheral surface of ‘lining material 65 the roller 25 drives the roll 5. An air cylinder 28 is also
varying the ?eld current of a DC. driving motor.
The roll for carrying the sheet material is preferably
indirectly driven by means of a driven friction roller
wound on an associated take-up roll. The lining material
is interleaved, on the ?rst~rnentioned roll with the sheet
located on the turret frame 3 and its connecting rod 29 is
operatively connected adjacent to an end of a lever 30
material and thus when the lining material is unwound,
pivotally mounted between its ends on the bracket 27,
the sheet material is simultaneously unwound. Alterna
the other end of the lever 30 being connected to one of
tively, the drive may be coupled directly to the axle of 70 the arms 26 so that operation of the air cylinder 28 moves
the take-up roll or to the axle of the roll for carrying
the driving roller into driving contact with one or otherv
of the rolls 5. When the pressure is released from the
the sheet material.
3,044,727
3
4
Whenvthe operator has wrapped a length of the ma
cylinder 28, a return spring 31 attached at one end to the
frame 3 and connected via a linkage 31a to the lever
terial around the entire circumference of the former, the
30 moves the driving roller 25 away from the roll 5.
material is torn, a ply joint made and the remainder or .
A speed-control unit 36, of known design employing
thyratrons to control the ?eld current of the motor 23, is
the material is rolled back on to the roll carried by the
mounted on the turret frame 3 and is connected to the
electric motor 23 and to the transducer 20 in a manner
so that when the core 19 of the transducer 26 is moved
turret which is then operated to bring the next pair of rolls
into position adjacent to the former and the operation
which has just been described is repeated.
Having now described our invention, what we claim is:
into the transducer coil 21, the speed of rotation of the
1. Apparatus for supplying sheet tire building material
The apparatus just described operates in the following
said motor having a dynamic braking circuit and a speed
control unit, a control switch to open and close said dy
namic braking circuit, a transducer to ‘control said speed
motor 23 is increased. The micro-switch 22 earlier re~ 10 to a tire building machine which apparatus comprises
a roll for carrying sheet material positioned to deliver said
ferred to operates an electrical circuit to place a load
material through a space to said tire building machine, a
resistance across the armature of the motor 23 to provide
variable speed electric driving motor for rotating said roll,
dynamic braking therefor in a manner well known.
manner.
The required roll 4 of ply material 6 is brought into
position adjacent to the former 9. The dancing roller
16 is then lifted by the operator so that the micro-switch
22 is disengaged to disconnect the dynamic braking cir~
cuit and so that the core 19 of the transducer 30 is moved
into the transducer coil 21 to operate the speed control
unit 36 and cause the electric motor 23 to rotate the lin
ing take-up roll 5 and thus feed out a length of the ply
material 6 from the ply-carrying roll 4. This ply ma
terial is then passed by the operator underneath the danc
ing roll 16 and over the roll 12, over the ply guide tray
11, and the roll 13.
In passing the material underneath the dancing roller
and over the guide tray and rollers, the material is de
?ected by the dancing roller. When the former 9 ro
tates it applies slight tension to the material, the dancing
roller is lifted to cause the core 19 of the transducer
20 to move into the transducer coil 21 thereby operating
the electric motor 23 to feed the material 6, the elec
trical arrangement being such that a slight increase of ten
sion in the material 6, which causes the core 19 to move
‘control unit, a roller positioned to rest on and de?ect ma
terial passing through ‘said space from said roll to said
tire building machine, a lever having an arm supporting
said roller and tilting as said roller rises and falls and
having an arm to engage said control switch and said
transducer to speed said motor when said sheet material
in said space straightens and actuates said control switch
to close said ‘braking circuit when said roller falls below
a limiting distance.
2. Apparatus for supplying sheet material under slight
tension to a tire building machine which apparatus com
prises a roll for carrying sheet material positioned to de
liver said material through a space to said tire building
machine, a variable speed electric driving motor for ro
tating said roll, said motor having a speed control unit,
a transducer to control said speed control unit, a roller
positioned to rest on and de?ect from a straight line ma
terial passing through said space from said roll to said the '
building machine, a lever having an arm connected to said
roller to tilt as said roller rises and falls and having an
arm connected to said transducer to speed said motor
when said sheet material in said space straightens and t0
slacken said motor when said sheet material in said space
Stretching and distortion of the material is thus very con
siderably reduced, when compared with the previously 40 de?ects from a straight line.
3. The apparatus of claim 2 having a take-up roll to
mentioned apparatus, since any’ tendency to increase the
wind up lining material interleaved with the tire building
tension in the material, when a greater rate of supply of
material and in which said driving motor drives said take
material is required, causes an increased speed of rota
up roll.
tion of the roll carrying the ply material, by virtue of the
4. Apparatus of claim 3 comprising a friction roller
operation of the transducer and speed control unit as just 45
engaging the liner on said roll to drive said take-up roll
described, to increase the rate of material supplied.
and driven by said motor, said friction roller being mount
This advantage applies equally when the operator, hav
ed to move into and out of engagement with said lining
ing drawn the material over the guide tray in the manner
material.
described, and adhered the leading edge of the material
to the building surface of the former 9, rotates the former
References Cited in the ?le of this patent
so as to wrap the material around the entire ‘circum
UNITED STATES PATENTS
ference of the former. As the former rotates, the dancing
further into the transducer coil 21, operates the motor
23 to drive out the material from its roll at a greater rate.
roller is lifted by the slight tensioning of the material and
controls the speed of supply of the material in accordance 55
with the demand rate as described,
1,815,020
Alexander et al _________ __ July 14, 1931
1,986,224
Goins _________________ __ Jan. 1, 1935
2,480,704
Breth ________________ __ Aug. 30, 1949
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