Патент USA US2404449код для вставки
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 l I , IM § 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 ., ‘1" 17953. 72 f——,—> - ‘ <1— 4}’ ' INVENTOR. I Cu r1. I51? I15. 1% C'HESNEK *” @471 TM /Z"w ATTORNEY July 23, 1946. c. $(MOCHESNEY 2,404,449 AUTOMATIC TIRE STITCHING MACHINE Original Filed Oct. 5, 1942 8 Sheets-Sheet 4' 5/1 .4 /I!i47 w E,” \\\\\\ \\ \\\\. | \\ l I | I INVEN TOR. CUVL E4? 5. Mt.‘ Chas/YE)’. BY ‘ 5% A TTORNEV July 23, 1946. C. S. MCCHESNEY‘ AUTOMATIC TIRE STITCHING MACHINE Original Filed Oct. 3, 1942 7, I _____-_____.._.____.__..____ a Sheets-Sheet 5 / an.‘ rv.M.‘ “3%” ,M w.EH0.M5 w. A WC K. E v July 23, 1946. I ‘ 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. - ' . (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. I ' 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. I ‘ I ' ' ' > 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 1 ‘ 7 j ‘ 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.