US1657267A - Machine for making pneumatic tire covers or casings - Google Patents

Description

Jan. 24, 1928. 1,657,267

c. MACBETH MACHINE FOR MAKING PNEUMATIC TIRE COVERS 0R CASINGS Filed Jan.5. 1922 -2 Sheets-Sheet 1 i r 1291. 4 193 j 17 f Jam-24, 1928; 1,657,267

c. MACBETH MACHINE FOR MAKING PNEUMATIC TIRE COVERS QR CASINGS Filed Jams, 1922 2 Sheets-Sheet 2 WW W 1' 2 Patented Jan. 24, 1928.

UNITED STATES PATTI-INT OFFICE,

COLIN MAClBETH, OF BIRMINGHAM, ENGLAND, ASSIGNOR TO THE D'UNLOP RUBBER QOMPANKLIMITED, OE REGENTS PARK, LONDON, ENGLAND, A BRITISH G OMIAN Y.

' MACHINE FOR MAKING PNEUMATIC TIRE COVERS lOR CASINGS.

AppIication filed January :3, 1922, SeiialNo. 526,831 in Great Britain February 4:, i921.

This invention relates to machines 'for making pneumatic tire covers or casings (which machines are generally known as case making machines), and has particular reference 110 mechanism for rolling down the casing plies on the sides of a rotating core, comprising spinning :or rolling down discs which are carried by arms pivoted on ai'eciprocating carriage or slide, the said arms and the discs carried thereby being adapted to be moved into an inoperative position away from the sides of the core at the end of the inward or forward movement (of the slide andto be retained in the inoperative position during the outward or return movement of theslide. a a 3 According to this invention, the means for moving the pivoted arms and the discs into the inoperative position are so constructed and ii-ranged as tOlDO'VB inwardor forward with the slide, when the discs effect the rolling down of the plies, and at the end of the inward or forward movement of the slide, the said means partake of a slight forward or rearward movement relatively to the slide in order to exert a thrust or pull on the saidpivoted arms to move the spinning down discs outwardly away from the sides ofithe core and retain them in this positionwduring the outward or let urn mo-vement of the slide. The said :means for moving the pivoted arms and the :discs into the inoperative position may be operated by thedrivin shat'twhich operates the means for reciprocating the slide and may comprise aplunger vor rods adapted to move forward with thesslide and to engage with projections on the said pivotcd arms at the end of the forward move ment 0]": the slide in order to move the arms and the discs into the inoperative position and retain them therein during the return movement-oi the slide. The reciprocation of the slide may be effected by means ofanosoillatory lever, and a similar leverymay be employed for actuating a. plunger which moves the pivoted arms and the discs into "the inoperative position. Alternatively cranks or eccentrics on a rotating shaft-may be employed for reciprocating the slide and.

moving the pivoted arms into the inoperative position as hereinaiter more fully described. Means. may he provided for enahling the IiltEpOf inward or forward movement of the slide and the spinning down discs the varied so that the discs may move atan initial high speed when laying or rollmg down the plies near the crown of the core, and at a slow speed when laying the plies over the bead heels. For this purpose theosci'llatory lever for reciprocating the shdemay he formed with a curved or cam slot in which a roller or pin eceentrically mounted on a revolving disc or the like is adapted to engage, the shape of this slot being such that the required variable speed ofanward movement is imparted to the slide and thezspinning clowndiscs. i

Inlorderthat the said invention maybe clearly understood and readily carried into effect, the same will now be described more fully with reference ltO the accompanying drawings, in whicl1 i Fi ures ,1, 2 and 3 are respectively a sec tiona .tront view, a plan, and sectional end view of one construction of :the improved means in which oscillatory levers are used for efiectln-g the required movements.

Figures 4 and 15 late sectional front views of slightly modified construction.

Figure 6 "1s ;a chaaram [illustrating modi lied construction of the oscillatory lever for producing a variable speed of radial travel otthe spinning down discs during the oper atlveistroke. p v Figure 7 is a diagram hereinafter lexplalned invconnect-ion with the -modified-n0llstruction of oscillatory lever illustrated in Figure 6. l I

-llligur,es :8 and 9 :ELI'B u'espectively a front view and 1a plan showing a construction in whichn crankshaft is used for effecting the reqniredanovem'ents.

Figures 10 and 11 are respectively a front View and aplan ofa further modification. it Figure 1-2 isle plan showingone mode of maintaining lthevidiscs :against the sides of the core.

Figure 13 isle sectional view including the oscillatory lever illustrated (in Figure 6,.

A represents a portion of the tire core which is supported on the rotary spindle of the case making machine and A indicates a ply or plies thereon. J3 B are the spinning down discs rotatably mounted ion brackets B ,B .angularly movable on ,p'ins .13 B at the inner and forked @ends of arms B B j a suitable rotarypart of the machine, carries In the example shownin Figures. 1 and 2, a revolving crank disc D operated from an eccentric hush having two portions D D of different diameters; the smaller portion D fits in a longitudinal slot in alever D whose upper end is pivotally'connected to the aforesaid slide (3 and whose lower end has an elongated slot in which ispositioned a pin D mounted in'the said base ort'rame C this connection at the lower end of the lever enabling the latter to oscillate and move longitudinally onthe pin D due to the rotary movement oi? the crank disc D and thus effect the reciprocation of the slide C. The said pin'D may beadjustable in a slot C in the said base in a direction parallel with the direction of movement of the slide thereby enabling the positions of the lever D and theslide Gto be varied to suit cores of different diameters, "The larger portionD of the said eccentric bush-fits in aslot in a second oscillatory lever D whose lower end is mounted on the aforesaid pivot pin D whilst the upper 'end of this lever may carry a roller D which is adapted to engage with a plunger'D carried by-and slidably movable in a guide C fixed on the aforesaid slide. The plunger D carries at its forward end an adjustable head D which at a predetermined moment is adapted to be but not relatively thereto;

forced by the lever B? into contact with projections B on the pivoted arms B which carry the spinning down discs B. The larger portion D of the eccentricbush is so arranged as to cause the lever D to lag '45 nected'directly or indirectly to the arms carrying the spinning down'disc's sothatthe latter aremaintained against the sides of the core. Figure 12 illustratesone construction in which the pivoted arms B are prol vided with or have secured thereto projections or extensions BTto which are connected by means of cables, chains or the like G passing around pulleys H tension-[springs J that are'securedto the carriage or slide C. The tension springs J tend to pull the projections or extensions 13 in a. direction away from each other so that the pivoted arms 6 tend to move towards each other in order to maintain the discs B in contact with the plies on the sides of the core. In addition to spring means for maintaining the discs in contact with the sides of the core additional pressure means may be provided whereby the pressure with which thediscs bear on the plies is increased as the discs pass over the heads, but this arrangement forms no part of thepresent invention and is described in Patent No. 1,565,176. Upon the spinning down discs B just passing the inner edges 01' the plies A" or the bead toes thereon the lever l) in continuing its forward movement pushes the plunger D forward relatively to the slide C so that its adjustable head D engages with the projections B on the arms B carrying the spinning down discs thus angularly moving the said arms B in such manner that the spinning down discs are moved away from the sides of the core; the

mechanism is so arranged that the lever D maintains the plunger head D in contact with the said projections B during the return'or outward movement of the slide so that the spinning down discs are held well away from the plies on the core during the return or outward stroke. WVhen the torwarr'l orfinward movement is about to take place again, the lever D is so controlled by the portion D oi. the eccentric hush engaging therewith, that it no longer maintains the plunger head D in engagement with the said projections B on the arms 13''" thus allowing the latter to assume the operative position in which the discs B make contact withthe plies on the core.

Inthe modification shown in Figure l the lever D is formed at its upper end with a toothed segn'ient D in mesh with a toothed rack G on the underside of the slide C, in this case the pivot pin D at the lower end of thislever fits in a round hole in the lever instead of an elongated slot as in the foregoing example.

In the further modification shown in Fig ure 5 the upper end of the lever D is connected to the slide C through the intervention of a link D and the upper end of the lever may also be connectedto the aforesaid plunger D by means of a link D 'lnslead of using an oscillatory lever D with straight slot as shown in Figures 1, 4 and 5' for effecting the inward or spinning down stroke of the discs B. the oscillatory lever D may he provided with a curved slot 1 in which the roller D works; by means 01": this curved slot it is possible. to vary the speed of radial travel of the spinning down discs during the operative or spinning down stroke in such manner that the discs initially travel at a high speed over the casing from near the crown, the speed name? being gradually reduced the discs travel over the sides oi? the casing until they are travelling at a comparatively slow speed at the head heels where ifolding over the ply requires careful "operation in order to avoid creasing at this point. The straightslot in the levers D shown in Figures 1, 4 and .5 does not permit of this speed variation and therefore the speed of the discs during the inward radial movement ilS mainly determined by and has to conform with the slow speed required at the beads. By using the lever D with the curved slot '1 the complete inward travel can he performed more quickly by reason of the initial rapid speed that can be imparted to the'disos.

Figure 7 shows a curve (1, 1), 0, def which the vertical ordinates represent the radial velocity of the spinning down discs in relation to the casing A of which one side or half is shown under the said curve. It will be observed from the curve that at the commencement of the stroke indicated at la the speed of [the discs increases very rapidly to maximum at the point I) and then gradually decreases during the travel along the sides of the casing until reaching the bead heel at c where the speed is very low to permit of the ply being folded over without creasing, after which the speed increases to point- At the commencement of theinw-ard stroke, the lever D and the rollerD are i-n-th'eposition shown by dotted lines at the left in Figure 6 and as the roller in moving round its circular path indicated by 41 leaves the curved face 1" of the curved slot the velocity rapidly increases to its maximum .as indicated at h in the diagram shown in Figure 7., when the face 1 of the \curved slot is ap; proximately at right angles to the path :of travel of the roller D. From tl-iispointthe velocity gradually decreases :as the roller D moves down the face 1 and on reaching the position shown by dotted lines at the right in Figure 6 the face 1 is nearly tangential to the circular path of travel of the roller when the velocity is very low this being at the point 0 on the aforesaid curve shown in Figure 7 where the spinning down discs are just travelling over the heads. After this an increased velocity is produced by the roller D engaging with the curved face 1". Thus the inward stroke is completed and the return stroke is sinnlar to that obtained with the straight slotted lever shown in Figures 1, 4, 5, as the lower por tion of the curved slot 1' is made straight. The type of lever shown in Figure 6 althongh particularly suitable for beaded edge d'diiers or casings may he used with advantage on straight side covers as by retarding the speed of radial travel of the spinning down discs over the head a better consolidation of the latter is effected whilst the complete cycle quickly than with the straight slotted lever. Y

The example shown in Figures (8 y and 9 show a modification in "which the-aforesaid oscillatory levers D are not need; is this case the reciprocation of the slide (3 and the actuation of the arms 58 spinning :down discs B is effected sby means of :a three throw crank shaft rotatalb'ly mounted on a plate or frame 0 on which the slide i carrying the arms B :s.upporting the spinning down .discs B is slidably. mounted. The C on which the crank shaft E is mounted is capable of adjustment on the hase C" so that the whole spinning down mechanism can be readily adjusted to suit cores of various diameters. The crank shaft E is rotated by a gear wheel E driven in any appropriate manner and by means of a mod E connected to the medial crank of the shaft E it impart-s reciprocation to the slide C. The two outer cnan-ks oi the said shaft E are connected means of pull rods E to projections B on the arms 13' carrying the spinning down discs and the angular positions of the cranksaa'e so .ar ranged that upon the .spimiing down discs completing the inward or forward stroke, the outer cranks cause the pull rods E" to actand open vout the said arms B thus moving the spinning down discs out of contact with the sides of the core. The pull rods E may have adjustable collars E which hear against the projections 13 on the said arms In the further modification shown in Figures I0 and 11, instead of using a three throw crank shaft, there is employed a shaft F driven by gearing F and "having end cranks which through suitable rods F connectedto the slide C impart the reciproca tory movement to the slide 'C. l The said shaft F has an intermediate eccentric F which may be connected by a rod F to the plunger 1) having an adjustable end D which is adapt ed to engage with the projections on the disc arms at the end of the in-waidstroke to move the spinning down discs out of contact with the core and to maintain then'l in this position during the return stroke.

The base C 'on which the spinning-down mechanism is mounted may be, positioned below the axis of the core spindle and it may be so inclined that the spinning down discs reciprocate in a radial path at an angle of about 45 degrees to the vertical. y

Instead of using single spinning down discs .at each side of the core two discs for example a spinning down disc and a driving disc as described in the specification of my application No. 526,091, 'fi'led Dece1nber31st, 1921 may be caused to travel along" each side of the core the reciprocating imeans hereinbefore described.

z ters Patent of the United States is 1. Spinning down mechanism for tire making machines comprising a reciprocating carriage, arms pivotally mounted on the earriage discs carried by said arms and adapted to act on the plies of the tire as the carriage moves forward, and means movable with the carriage and adapted at the end of each forward movement thereof to have an additional movement in the directionof the line of travel of the carriage to effect relative movement between the carriage and said arms to move the discs away from the casing plies and retain them in an inoperative position during return movement of the carriage.

2. Spinning down mechanism for tire making machines comprising areciprocatoryearriage, arms pivoted on said carriage, spinning down discs carried by said arms, means movable with the carriage and adapted at the end of each forward movement thereof to have an additional movement in the direction of the line of travel oi the carriage for moving the arms and discs into an inoperative position, and a drivingshatt adapted to actuate both the means for reciprocating the carriage and the means tor moving the arms and discs into inoperative position. Y i

3. Spinning down mechanism for tire making machines comprising a reciprocatory carriage, arms pivotally mounted on said carriage, spinning down discs carried by said arms, members for reciprocating the carriage, plunger-like means adapted to effeet movement of the pivoted arms to carry the discs to inoperative position, and re ciprocating members for actuating the plunger-like means at the end of each forward movement of the carriage, for the purpose described. a

4. Spinning down mechanism for case making machines as set'forth in claim 1 in which aplunger or rod for engaging with the arms carrying the spinning down discs moves with the carriage until it reaches the end of its inward stroke, whereupon relative movement between said plunger or rods and the slide takes place so that the arms carrying the spinning down discs are moved into the inoperative position substantially as deseribedjfor the purpose specified.

5. Spinning down mechanism for tire making machines comprising a reciprocating carriage, arms pivotally mounted on the carriage, spinning down discs carried by said arms and adapted to act on the plies of the the as the carriage moves forward, a plunger engaging the arms earryin the spinning down discs, said plunger adapted to move with the carriage until itreaches the end of its inward stroke, whereupon relative movement between said plunger and the carriage takes place, so that the arms carrying the spinning down disc are moved into inoperative position, an oscillatory lever actuated by a crank discior imparting reciprocating motion to the carriage, and asecond oscillatory lever for engaging said plunger and operatively associatedwith said first mentioned lever.

6; Spinning down mechanism for tire making machines comprising a reciprocatory carriage, arms pivotally mounted on said earriage, spinningdown discs carried by said arms, and means movable with the carriage and adaptedat the end of each forward movement thereof to have an additional movement in the direction of the line of travel ofthe carriage for reciprocating the carriage at a variable speed, the parts being so proportioned that during forward travel of the carriage speed increases rapidly to the mechanism and then gradually decreases during the travel of the discs along the sides of the tire casing toward the beads over which the discs t'avcl slowly.

7. Spinning down mechanism for tire making machines comprising a reciprocatory carriage, arms pivotally mounted on said carriage, spinning down discs carried by said arms, an oscillatory lever for lGClPlOCfllling the carriage, a revolving member for oscillatingsaid lever, a second oscillatory lever actuated by said revolving member, aplun er slidably inonnted on the carriage and connected to the second oscillatory lever, and means whereby the plunger will engageithe pivoted disc carryingarms at the end of the operative stroke of the carriage so as to move the discs into an inope 'ative position. 8. Spinning down mechanism for tire making machines'as set ii'orth in claim 7, in which the oscillatory lever for reciprocating the carriage is provided with a cam surface, an eccentrically mounted projection on the revolving member engaging said cam surface, the latter being so shaped that a variable speed is imparted to the spinning down discs and carriage during forward move ment of the latter.

9. Spinning down mechanism for tire making machines comprising a reciprocatory carriage, arms pivotally mounted on said carriage, spinning down discs carried by said arms, a rotary shaft, crank or eccentric like means operated by said shaft for reciprocating the carriage, reciprocating means on the carriage adapted to co-operate with the pivoted disccarrying arniis to move said arms and discs into an inoperative position, and means operated by said shaft for actuating the last said means at theend of the ope tive or forward stroke 01' the carriage.

COLIN MAOBETH.

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