US2644274A - Burn-off machine - Google Patents

Description

July 7,' 1953 T. w. BAH- EY 2,644,274

BURN-OFF MACHINE Filed may 7, 1949 s sheets-sheet 2 8 Il@ ||8 frz@ UHD/IVG ZONE.

- @TA Tlc/VARY VACUUM (007301.

F/RE CONT/e011 can. @mamey July 7, 1953 l T.W.BA|| EY 2,644,274

BURN-OFF' MACHINE Filed May 7, 1949 s sheets-sheet 5 Z |29 E .'6 @Y Wam@ A Qttornzp Patented `uly 7, 1953 UNITED STATES PATENT oFFIce" BURN-OFF MAoHiNE;

Thomas W. Bailey, Hammondsport, N. Y., as

s'ignor to Corning Glass Works, Corning, N. Y.. a corporation of New York Application MayV 7, 1949, Serial No. (Cl. 4,9750) 11 Claims.

The present invention relates to improvements in devices for severing glass by burning it off, and more particularly to devices in which the glass and burner travel in a circular path while the burning oi is being accomplished.

The prime object of the invention is an improved form of apparatus for controlling the connection and disconnectionof a source of vacuum-to-vacuum Achucks employed in holding the ware during the burn-off operation and for controlling the connection vand disconnection of fue to the burn-off burners. l

The invention is embodied in a machine wherein a cam opens a valve to apply vacuum from va suitable supply line to an article chuck as it passes through a loading zone and wherein the holding of such valve in its open position as .the chuck leaves the loading zone is contingent on the presence of an article in the chuck so that if the chuck is unoccupied upon leaving the `Aloading zone, the vacuum valve is closed and thus unnecessary opening of the vacuum supply line to atmosphere is prevented. As the chuck leaves the loading zone and enters the burn-off zone, cam means is provided forV opening a valve inthe fuel line to the burner associated with such chuck. Facilities are provided, however, to prevent such valve being opened if the chuck upon leaving the loading zone is unoccupied so that the connection of fuel to a burner associated with an unoccupied chuck is prevented.

' The accompanying drawings show a preferredl l embodiment of the invention. In the drawings, Fig. l is a sectional side elevation of the machinei Fig. 2 is an enlarged sectional plan view of a fragment of the machine as indicated by line 2 2 in Fig. '1; Fig. 3 isa sectional elevation taken on line 3 3 in Fig. 2., and in addition, showing a sectional elevation of an associated burner not shown in Fig. 2; Fig. 3a is an enlarged sectional View of a fragment of an upper section of the apparatus shown in Fig. 3;V Fig. 4 is a sectional plan view taken on line 4--4 of Fig. 3; Fig. 5 is a diagrammatic plan view illustrating the cam arrangement employed; Fig. 6 is an enlarged View in section of a vacuum valve assembly shown rin its Voperated position and is similar to the view of Vsuch assembly appearing in the right-hand portion of Fig. 1 in its normal position; Fig. '7 is a sectional plan view taken on line l-l of Fig. 6; andv Fig. 8 is an endY elevation taken on line 8'8 of Fig. 2.

Referring now to the drawings in detail, the machine embodies a base in which is mounted a central supporting column I2, adapted to be 2 rotated by agear |3 in mesh with a driving pinion I4 carried by a shaft I5 rotatable by a motor '(not shown). The upper portion of column l2 has secured thereto a'turre't 2| having arranged about its periphery a number of brackets such as a bracket 22, each supportingan article'chuck such as'article chuck 23. `Al`so arranged on column l2 isl a vacuum chamber 3| having attached thereto a manifold 32 containing an annular oxygen chamber 33 and an annular gas chamber 34. `The chamber 3| on its underside near its periphery' is provided with a vacuum control valve assembly' such as the assembly 5|, (Figs. 1 and 6) for eachfchuck assembly. .The chamber 3| Valso is provided about its periphery with brackets such as 4|, (Figs. l and v3) each provided with a burner supporting'bracket 42 and a burner 43. Each bracket' 4| alsoY supports burnercontrol valves and their operatingV mechanisms, as will be described hereinafter.

Vacuum control valve Referring particularly to Fig. 6, each of the therewith by way of suitabler passages 54. Thel chamber 53 also voommunicates with a valve chamber 55. by'way of va passage V56 normally Y.

closed by `a disc member 51 carried by` a valve stem 59 and held againstV an associated seat 58`by aspring. f

With the valve disc 5l on its seat .58, chamber 55 is in 'communication with atmosphere lby way of a passage between a valve member 12 and its seat 14' through an exhaust passage 1|. The chamber 55 is also in communication by way of a conduit 7-3 with a vacuum chuck such as chuck 23, and by way of a conduitv |29 with a negative pressure chamber (notshown) similar' to chamber |21 (Figs. i and 3) The valve 5| has an additionalchamber l5 in communication with the chuck'23 by means of a conduit 1,6 extending from the chamber wall 15.

The valve actuating stem 59 is at one end provided with'a'cr'oss arm''i (Figs. 6 and') carrying a roller i9v adapted to' engage a cam Sto in'Fig. l 'toits operated position shown inFig. 6

as the chuck 23", associated with Vvalve 5|, enters the loading zone. 'lilithy valve 5| in its operated position theval've member 12 is on its seat'14 so Vthat the chamber 55 is'closed to atmosphere and vacuum chamber 3| is' incommunication with chuck 23 lvia conduitl', chamber'55', passage 56,

,adjustable cap screws into the burn-ofi zone, the valve 5| will remain operated even though roller 'i3 moves off the lobe of cam 33. If, on the other hand, the chuck is not loaded while passing through the loading zone, the negative pressure in chamber 'I5 will be insufiicient to hold the stem 59 in its operated position and accordingly, as the chuck 23 leaves the loading zone, the stem will be restored to its nor-v malposition by spring B to reclose the passage 6 and thus prevent unnecessary admission or" air into the vacuum chamber 3|.

Burner control valve For each burner such as burner 43 (Fig. 3) there is an oxygen line 9| (Figs. 1 and 2) extending from oxygen chamber 33 to a manually operable valve 94 which feeds oxygen through a spring-closed valve 35 to a mixing chamber |00 (Fig. 8). A similar line S8 extends from gas .chamber to a manually operable valve 90 for feeding gas through a spring-closed valve 06 to the mixing chamber |00. A passage |05 extends from mixing chamber |00 through a flexible tube |06 to the burner 43.

Valves 95 and St are adapted to be opened by |09 and H0, `threaded through a lever III which at the one end is pivf oted on a pin I I2, and at the other end is coupled i to a slide rod I3. The rod I I3, having reference to Figs. 2 and 3a, is adapted. to be moved to the right, to open the valves 05 and 96, by an arm I I5 .integral with a `sleeve I I8 splined to an extension its associated chuck 23 (Fig. l) leaves the loading zone, to rock the shaft in a counterclockwise direction to open valves and 90. l

The normal position of arm H5, however, as indicated in Fig. 3a, is at a level'below that of slide rod H3, so that unless arm H5 is in its raised position at the time that roller |20 engages cam I2I, opening of valves 35 and 96 will not occur. The sleeve IIS, with which arm ||5 is integral, is supported on a stem |25 attached to a diaphragm |20 forming a wall of negative presf sure chamber |21. A spring |28 assists gravity in normally holding sleeve ||8 in its lower position. Chamber |2'| is connected by means of aV conduit |29 with a chamber of valve 5| corresponding to chamber of valve 5I. Y It accordingly follows that sufficient negative ranged at the junction of the loading and burnolf zones lights the burner.

As a chuck, chuck 23' for example, leaves the: burn-ofi zone, roller |20 passes off the lobe of cam I2| enabling spring |I9a to rock shaft ||1 to its initial position, thuspermitting valves 05 and 96 to reclose and cut off the fuel supply to' burner 43.

As a chuck, chuck 23 for example, enters the .unloading zone, roller 'I9 of the associated valve 5| engages a cam |40 which, in spite of the negative pressure in chamber l5, restores the stem of VVvalve 5| to its normal position to cut off the vacuum to chuck 23 and to at the same time vent the chuck to atmosphere so as to release an article, such as article |50, for example, from the chuck. The restoration of valve 5| to normal in venting chuck 23 to atmosphere also vents chamber 'I5 and the corresponding chamber |2I; With chamber l5 vented, valve 5I will not operate again until its roller 'I9 again encounters cam 80. The venting of the chamber corresponding to chamber |27 enables the associated elements, notV shown but corresponding to sleeve I i8 and its arm I5, to be restored to their initial position by a spring such as spring |28.

Auxiliary features Inorder to positively assure closure ofvalve disc 5|.on its seat 53 by cam U30, and the seating of the other similar valve discs on their seats without necessitating extreme precision in manufacture, such cam is carried by a spring-loaded bell crank |5I (Fig. l) which enables movement of the cam following engagement of a disc member such as 51 with its seat. In a similar fashion positive closure of each -valve member such as member E2 on, its seat by cam 80 is assured by placing the pivot I 52 of cross arm Il (Fig. '7) in a slot |53 vand normally resiliently holding pivot |52 at the right end 4of the slot by a spring |54. With this arrangement any movement imparted to a cross arm 7l by cam 80 after member 'I2 is seated simply causes the pivot |52 of arm T1 to shift leftward (see Fig. .7) against the tension of spring I5li. Y

What is claimed is: n

l. In a burn-off machine, a vacuum article chuck, means providing a path of travel for said chuck through loading and burn-off zones, respectively, a vacuum line to said chuck, a normally closed valve in said vacuum line, meansk for opening said valve when said chuck enters the loading zone and for holding said valve open only while the chuck is passing through such zone, means activated by the creation of negative pressure' in the branch of said line between said valve and said chuck when an article is engaged by said chuck to continue to hold said valve open through the burn-off Zone, a burner associated with said chuck, a fuel line to said burner, a normally closed valve in said latter fuel line, an element for opening said latter valve, said element being vnormally inoperatively associated with respect to said latter val-ve, other means operative only upon the creation of such negative pressure to bring'said latter valve and element into operative association, and means for moving said element ywith respect to said latter valve to open the saine zone.

2. In a burn-:off machine, an article chuck, means providing a path of travel for said chuck through loading and burn-01T Zones, respectively, a burner associated with said chuck, a fuel line as the chuckenters the'burn-off acilgsvii to said burner, a normally closed valve in said fuel line, an element for opening said valve, said element being normally inoperatively associated with respect to said valve, means operative pneumatically only When `an article is engaged by the chuck to bring said valve and element into operative association, and means for moving said element with respect to said valve to openthe same as the chuck enters the burn-oif zone.

3. In an article-handling system, a vacuum article chuck, means providing a path: of travel for said chuck through at least two Zones, a vacuum linev to said chuck, a normally closed valve insaid vacuum line, means for opening said Vvalve when said chuck enters the first of said zones and for holding said valve open only While the chuck is passing through such zone, and pneumatic means for continuing to hold said dependently of said valve-opening means, when an article is engaged by said chuck, said pneumatic means including a diaphragm associated with said valve and adapted to be moved from a normal -to an operated position when said valve is opened, said diaphragm constituting one Wall of a negative pressure chamber, and a branch vacuum line extending between said chamber and said rst vacuum line between the article chuck and the valve.

4. In an article-treating machine, a rotary turret, a Vacuum chuck carried by said turret, a vacuum line to said chuck, a line for supplying fluid in the treatment of an article engaged by said chu-ck and including a valve, a normally disabled mechanical means for actuating said valve, and means connected to said vacuum line operated by the creation of a negative pressure when an article is engaged by said chuck to enable said mechanical means to effectively function.

5. In a glass burn-off machine Vof the type wherein a revolving turret equipped with a row of vacuum-type article chucks is provided to con- Vey said chucks through loading and burn-off zones, a vacuum sup-ply line including a valve for each chuck, each valve having an operating stem one end of which carries a roller, a cam engageable by said roller only during the travel of a chuck through a loading zone .to open said valve, the other end of said valve stem having a diaphragm attached thereto constituting one Wall of a negative pressure chamber; and a conduit connecting said chamber with said chuck whereby, when a negative pressure is created in. said line by the engagement of an article by the chuck, closure of the valve after the `chuck leaves the loading zone and enters the burn-off zone is prevented.

6. In a burn-ofi machine, vacuum chuck,

valve open through the second of said zones,A inoperatedduring-passage of said chuck through the burn-01T zone, and means for restoring said valve while saidl chuck is passing through 'the unloading Zone.

7. In an article-treating machine, a vacuumtype article chuck, means ,for moving said chuck through loading, article-treating and unloading zones respectively, a vacuum-linea valve in communication with said chuck and providing a normally closed passage between said lineand chuck and providing a normally open passage between atmosphere and said chuck, a spring holding said valve in its normal position, means for actuating said valve to open said rst passage and to close the second when said chuck enters theloading zone, means activated by the creation-of negative pressure in said chuck after an article is engaged thereby to hold said valve'actuatedfindependently of said `valveactuatin`g means after said chuck leaves y the loading zone and enters the article-treating Zone', and means for' forcing said valve closed against the action of said valveholding means when said chuck enters the unvloading zone to release the article from the chuck.

8. A machine such as defined by claim '7 including a device associated with the chuck adapted to direct a treating medium against an article engaged thereby While the chuck is passing through the article-treating zone, a supply line to said device, a normally closed valve in said supply line, an operating element normally disassociated therefrom, means activated by the creation of the negative pressure in the chuck after the article is engaged thereby for operatively associating said operating element. with said latter valve, andmeans f or actuating said element to open said latter valve when the chuck enters the article-treating zone.

9. In a burn-01T machine, a vacuum article chuck, a rotary turret for conveying said chuck through article-loading, article burn-off and article-unloading zones in succession, a vacuum line to said chuck, a valve in said va-cuum line having an operating stem, a spring cooperative with said stem normally holding said valve closed.Y

a roller on one end of said stem, a cam engageable by said roller only during the travel of said chuck through the loading zone to open said valve, a negative-pressure chamber having a means providing a path of travel for said chuck through loading, burn-off and unloading zones respectively, a vacuum line, a valve, said valve having a rst chamber and a second chamber in communication with each other, said nrst cham-ber being in communication with said chuck and normally open to atmosphere and said second chamber being in communication with said vacuum line, said valve also having an element. normally closing the communication between its chambers and another element for closing said rst chamber to atmosphere when the valve is operated, means for operating said valve vonly while said chuck is passing through the loading zone, means activated by the creation of negative pressurein said chuck when an article is engaged thereby to independently hold said valve diaphragm constituting a Wall thereof and being attached to the `other end of said stem, a conduit connecting -said chamber with said chuck whereby a negative pressure is created in said chamber whenever an article is engaged by said chuck to prevent closure of said valve while the chuck is passing through t-he burn-oi zone, and a cam engagable by said roller while the chuck passes through the unloading zone to aid said spring in moving said stem to its initial position against the action of negative pressure insaid negative-pressure chamber.

l0. In a burn-off machine such as defined by claim 9, a burn-off burner adapted to surround an article engaged by the chuck, a fuelsupply line to said burner including a spring-closed valve, an element for opening said valve, said lelement being normally inoperatively associated with respect to said valve, a negative pressure chamber having a diaphragm wall linked to said element and adapted to move the same into operative association with said valve whenever negative pressure is Vestablished in said chamber, a conduit establishing 4communication between said chamber and the chuck whereby, when an article is engaged thereby, negative pressure is created iny Vsaid latter chamber, and means for moving said elemeit with r'sec't 't sad latter valve to open it as theA chuck enters the'birnzone.

11. fIn a burn-01T machine, vacum-type chuck,.a turret /fr ccrN'ey/i'g said chuck through loading and burn-'off z'r'ies 'a bui-c bhr, a fuel line to said b-urler i-'cliidirir a sbin'g'cldsed valve, an element fer opehihg saidy Y'Valve, said element being hally iiiperativl 'asscciated with respect to said vaive, a h'gativee pressure chamber havi'iig a 'diaphragm Wall linked t0 lsaid leiet and daptet the same ilt cpra'ti'v'e ss'ci't'i'ii with said valve Wheever heg'at'i bressre is'k created i said chamber, a cchduit establshiig ccri'- vniuni'catic'nrl between saidzh'a'mber and. the chufck whereby when an article is h'l'd gag'd by said. chuck, hegat/'e pressure created said chamber., a pivoted a'rn cbld' to 'said l'ereit, a roller dn said. al', and a cfai "e'ngtgable Ey 8p; said roller to mpvev` saidlement in a direction to O ate said Valve While Sad chuck i`s DaSSig th'gh s'aidAbur'nL-'off z o'ne. y y Y y l THOMAS W. BAILEY. References cited-lm he me of uns patent UNTED smfri's` P'AfENfis Number Name l, Date 1,432,032` Novick 11-17.14-111. oct'. '17, 1922 11,600,022 VanrHeek -111:. Sept. 14,V 1926 v1,'15'7,2-1l1. 'Parker 'Masr 6, 1 '930 1,871,707 Klupmeyer et al. -1 Aug. 16, 1932 1,956,647 McCoy May 1, 1934 1,987,336 Powell f Jan. 8. 1935 2,091,283 Johnson Aug. 31, 19-31YV *211,247,787V Schmidt V July 1, 1941 2,359,433 McNamara Oct. 3, 1944 2,416,121 Schreiber, et a1. Y Feb. 18,1947

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