US2382052A - Glass working machine - Google Patents

Description

Aug. 14,y 1945.

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' the use of electrically .ment of a novel form UNITED STATES PATENT ori-ica 2,382,052 g GLASS WORKING MACHINE David E. Gray, Corning, N. Y., assigner to Corning Glass Works, Corning, N. Y., avcorpontion of New York Application October 4, 1939, Serial No. 297,943

Claims.

The present invention relates to a glassworking machine of -the single mold type which gathers charges of glass from a molten supply body and fabricates them into ware.

One object of the invention is a simple method of gathering charges of glass and of their fairication into ware.

Another object is fa glass working machine e which is readily adaptable for lthe fabrication of a wide variety of forms and sizes of blown ware. A further object is a machine for the automatic gathering and fabrication of glass charges into ware in which the speed of operation and the timing of the various functions can, be readily modified during the operation of the machine.

The invention embodies among its features a glass working machine of the single mold type having a combined gathering, shearing, and blowhead assembly adapted to gather a charge of glass from the surface of a molten supply body, shear the charge therefrom, prepare the charge for introduction into a finishing mold while conveying the charge thereto, and to eject the nished article from such assembly in the course of its movement toward the molten Supply body for a `subsequent charge.

A further feature of the invention is the simplification of mechanical structureby resorting to actuated controlling solenoids and a pluralit of electric motors rather than complex mechanical controls and a single power source.

A still further feature embodies the employv of timer by means of which the/ timing of occurrence of an entire group of functions may be modiiiedas a whole with respect to other functions, or may be individually modined with respect to one another to suit best operating performance. s,

Other features' of the invention will appear as [the specification progresses.

A preferred form of machine. embodying the invention is illustrated drawings wherein 1 Fig. l is a plan view of the machine;

Fig. 2 is aside elevation of Fig. l

Fig. 2a is a fragmentary view in elevation and partly in section illustrating .a part` of a spindle drive mechanism; e

Fig. 2b is an enlarged view. partly in section, of

i a detail of the machine. s f

Figs, 3 and 4 together show an enlarged side elevation partly in section of the gatheing head assembly of the machine;

Fig. 3a is a sectional view of aswitch carried vby the head assembly;

Fig. 3b is a perspective view of part of the structure illustrated in Fig. 3a;

Fig. 3c illustrates part of the apparatus of Fig. 3 in an alternative position;

Fig. 4d is a view, partly in section, of a frag- :nent of the machine.

Figs. 5 and 6 are enlarged end and side elevations of fragments of the machine illustrating the head raising and lowering unit;

Fig. 5a is a view taken on line Sit-5a of Fig. 5;

Fig. 5b is a view similar to 5a, but showing the parts in a position they attain while in operation;

Fig. 'I is a plan view of the mold supporting and operating assembly;

Fig. -8 is a side elevational view of the mold supporting and operating assembly showing fragments of the mold halves mounted thereon;

Fig. 9 is a plan view of the mold support assembly showing molds mounted thereon and the arrangement for cooling the mold halves and parison;

Fig. 9a is a detail of the mold cooling nozzle; u Fig. 9b is a fragmentaryv detail showing part of the linkage between the mold cooling nozzle and 5 to that of the head assembly shown in Fig. 2, but

in the accompanying e illustrating a modified form of shear operating mechanism;

Fig. 13 is a detail of the shear operating mechanism of Fig. 12;

Figs. 14 and 15 are details of the head mechanism; y v

Fig. 16 is a. sectional plan view illustrating the quadrant and associated Darts;

Fig. 16a is a side elevation partly in section of a fragment of the apparatus disclosed in Fig. 16;

Fig. 17 is a aide elevation of Fig. 16;

Figs. is and 19 are enlarged pian and side views e l -of the swing mechanism;

Figs. 20 and 20w-20k diagrammatically illus- `trate the gathering of a charge and its developof the timing meenetimi'ng mechanism Fig. 24 is a plan view of the timing mechanism o with its cover removed:

a plunger lowering solenoid |18. Although the position of part-s as shown in Figs. 2 and 3 are such that plunger lifting plate 48 is in engagement with posts 80, such posts are not depended upon to hold the plate in such position. The plate is held against being lowered by the action of gravity by introducing friction to its movement through the medium of an associated adjusting screw 88 (Figs. 2 and 2b). In other words, posts 3l merely function to lift 'platen from a down position to which it has been previously moved by the energization of solenoid |18. I,

The collar 45 at its lower end carries a chuck operating yoke 58 held thereon by a nut 51, and I has trimnion block supporting pins 48 and 48' cast integral therewith which ilt into blocks 50 carried in the forked end of a collar supporting L* lever 5| (Fig. 2) the other end of which is pivotally secured to rocker arm'25 at 52.

The yoke 58 carries lifting rods 88 and 6| which run down alongside sleeve 2| and are threaded into a chuck raising shell'bearing collar 82 (Fig. 4) carrying a chuck operating shell 63 through a ball bearing assembly 64. The shell 63 contains a relatively heavy member 65 having chuck supports 86 pivoted thereto equipped with chuck jaws 81 and having free ends 68 extending into slots 88 of shell 83. The member 85 also contains chuck lifting levers 12. Each of these levers has one end 12' extending into a slot 83' in the wall of shell 88 and a forked endv 122 straddling a chuck support near its pivot point. 'I'hese levers have lower surfaces 15 which, as will be more fully brought out later, fulcrum on a plate 16 arranged immediately above the gathering cup 40 to slightly raise the chucks into engagement with the under edge surfaces of the cup after the closure of the chuck jaws thereabout With the chuck Jaws 81 in their open position the member 85 rests on jaw ends 88 which in turn rest on the ',bottm 0f the slots 69 in Shell 63. As will be made clear later, with the jaws 81 in closed position member 65 rests on its levers 12 which are then supported on plate 18 which is attached K to spindle 85.

time, as the head assembly is` being lowered, a

, bumper 54 (Figs. 2 and 12) secured to bracket 28 88 encounter the lower surfaces of slots 88 of the now stationary shell 88 `after which the supportsv vprior to the completion o f the downward move--r ment of the cup 4U so that such cup projects downward substantially beyond the bottom of the chuck jaws before its downward movement has been completed. The jaws become locked in their open position by a latch 55 (Figs. 3 and 3c) carried by bracket |118 and moved under the yoke 68 by a spring 58'as the sleeve'2l approaches its lowermost position with respect tothe yoke. Dur-- of sleeve 2|, the plunger lifting plate 48 encounters posts 38 so that as the downward movement of the sleeve and ofthe cup 40 are being completed the plunger is being retracted into the cup. During the raising movement of the head assembly, lever 5| is lifted clear of bumper 54 at which time a latch operating screw 58 carried -by an arm 5|' depending from lever 5| moves away from a spring actuated latch |08 to connect an associated shear operating rack |88 in relation for operation with a guide4 ||l| carried by the rocker arm 25.

As the gathering head arrives at the gathering station.' rocker arm 25 again functions to momentarily lower the sleeve 2| and spindle 35, this time for the purpose of introducing the gathering cup into a. supply body ofmolten glass to gather a charge and also to operate the shear mechanism, as will hereinafterappear.

A gather is obtained by suction during the momentary contact of the cup with the glass in a manner hereinafter described. During the raising of the assembly and separation of the charge from'tlie Supply body by the shear |50, latch 55 is tripped in a manner to be described later, thereby allowing the downward movement of the shell 63 with respect to the gathering cup 48. As shell 88 is lowered with respect to the gathering cup; the chuck jaws 61 are moved toward their closed position rby the engagement of the bottom of shell 68 with slanting surfaces 10 of supports 86. iThe lowering of shell 83 permits member 85 to lower the chuck jaws with respect to cup 40 so that they can close about the cup in the position illustrated in Fig.' 4b. Just before the shell 68 has reached its limit of downward travel, the surfaces 15 of levers 12 encounter plate 18 which serves as a fulcrum` for these levers and effects a slight lifting movement of the closed chuck jaws into engagement with the bottom surface of the gath-v ering cup 40,\as illustrated in Fig. 4c.

Shear operating mechanisms Alternative forms of shear operating mechanisms are illustrated. Each includes a rack guide assembly lill (Figs. Zand 12) pivotally connected at |82 to the rocker arm 25 and containing a rack |83. At the time the head assembly arrives at the gathering station rack |03 is llocked in fixed relation to its guide assembly by its latch |Ii6 so that the rack is raised and lowered with arm 25 and transmits rotary motion to a shear driving pinion |88 carried on the free end of bracket 28. This pinion is adapted to in turn drive a rack H8 pivotally connected to a lever 'Ihis lever at its left'` hand end is pivoted at H3 (Fig. 2) to bracket 28 and'- at the other end is forked to accommodate a trunnion block ||4 carrying a rack H5.' The ylatter rack operates in a guide ||1 Secured to the sleeve 2| and is in mesh with a pinion ||8. This pinion is integral with a single Atooth ratchet disc |20 adapted to drive its suriporting shaft |2| during the downward movement of rack ||5 through a pawl |22 carried by` an arm |28 keyed to such shaft.

In that form of shear operating mechanism illustrated in Figs. 2 and 3 the other end of shaft `|2I carries a bevel pinion 24 which is in mesh with a bevelgear |25 keyed to a shear operating shaft 28.v The arrangement is such that as rack H5 moves down shaft |2| is turned one complete ing the latter portion of the downward movement In that form o! shear operating mechanism illustrated in Figs. 12 and 13 the other end of shaft |2| carries a crank |28 equipped with a roller operable in a slot |28 of a. 'bracket iixed to s rack |30 operable in a suitable guide I3 I. This rack is in mesh with a pinion carried upon shear operating shaft |26. The arrangement is such that one revolution of shaft i2! is eiective to rotate the shear far enough to the glass and to then return the shear to its initial position rather than by continuing its rotation in the same direction to such position. Although this form oi? structure is slightly more complicated than that employing bevel gears, it is preferable ss it is less likely to distort the charge.

In both forms of structure the lower end of the shear operating shaft |26 hw keyed thereto flange I (Figs. 4 and i2) to which is secured shear cam roller operating jaw itl, which on being rotated transmits rotary motion to a sleeve Ill keyed to a shear carrying elicit i39 through a roller i carried by an arm [4i integral with sleeve III. Sleeve Ill is movable enciwise oi sliait Ill between a collar i6! pinned to tile shaft and a spring cup |52 also pinned to the shaft. .aum Justlng and locking nuts |51! are employed to closely restrict the allowable endvvioe movement of sleeve Ill relative to shaft |39. A spring it@ within cup |52 normally holds the :shaft |39 un relative to sleeve III. A secondi arm |42 integral with sleeve Ill .carries a roller which runs in tho track I 0f a drum cam MI (lilla. ill udjustublt' held in a half cup support is (Fig. 2) by can screws 1B and height adjusting .screws |5i 4).` The support M is rigidly iuouoteu ou sleeve Il. The contour oi track No :lo ouch that tutti cient axial movement is imparted to the shear shaft |39 upon rotation thereof to bring the shear blade |50, on the lower cnc] oi' shalt, from u lil fill

:lo U

position of rest Well above thc bottino ci the culo 1.

Il to s. position slightly bellino the bottoni or shearing face oi the cup until the t' s very slight extent under tbc after which the blade itil against the shearing face ol. ing thereunder by spring |53, u 1y shear the charges of glass ss the blade passes under tl axial movement of shaft |39 i variably telescopes into the los parent loo ring the ir enti simply' ond ol" hollow shaft |26, the telescoping cutis oi these sbatte' acting as bearings for one another.

It has heretofore been mentioned that the chuck collar latch Il (Figs. 3 anu 3c) is trippetl by the shear mechanism to close the chuck jaws. This tripping action is eflected by a tripping lever Ill pivoted on a bolt passing through bracket |10, and operated immediately following the shearing operation through a lever |58 and a coito necting'link. |89 by a pin itil carried by bevel gear |24 (Fig. 3) or in the alteri'latlve mechanism by a pin carried by a disc lil (Fig. 12) on shalt |2| of the shear driving mechanism.

It is to be noted also that latch trip screw 53 carried by the depending extension lil' ci arm 5| at this time encounters and moves latch |08 clear of the shear operating rack |03 so that on the subsequent lowering and raising cycle of the head assembly to elect a finished article the shear mechanism does not operate.

The plunger ISI; arranged within the gathering cup Il (Fig. 4) and which, as previously stated. functions to assist the chuck jaws in holding the plastic glass attached to the gathering cup, slides between the inner wsll ot` cup Il and 15 b lill lill

the outer surface of a retainer 4|. The plunger is held against rotary movement relative to cup 40 by a screw |56 passing through the Wall of the cup into a vertical groove in the plunger and is movable endwise with respect to cup 4|) by a key |61 attached to the lower end of a plunger rod |68 by a nut |69. Plonger rod |68 runs through the center and out of the top of spindle 35 and at its top enel (Fig. 3l is secured to the i'iub lill ol the heretofore described plunger lowering mechanism. including the plunger lowering solenoid llt` Whose circuit is completed by a switch itili tripped to closed position, as the chuck jaws close about the gathering cup lll, by pin itt protecting :from the clutch collar trunulon pin llt. The contacts oi the .switch |80 are normally licltl open against spring tension by a pin it (lille. 3b) operating in a com slot in a alloc itt oi the assembly. the disc is rotated bv tlic lowering oi' pin ills the holding open of suoli contacto lo transferred to a latch it! until auch piu liao been lowerctl cnougli to trip the latch by' cuoco-cutout with the tail im' thereof, whereupon closure oi the contacts it permitted.

Volte oost-cot e it i .ling will.

ai connecten to au air supply no tiiil g. ill bt' lucano oi o. ilcxiblc tube-209 ootl tlic vaticuuuo valve .is iu a similar :fashion connue 'l to voc'uuiil. supply liuc EW bv a iicxiblc tubo lilly whereas tlic atmosphere vuelvo I" directly connected to atmosphere at IIB iFig. El vio the boro oi' its stein its, The vacuum supply lino Hilti (Fig. il) is simply connected to a suitable vacuum punto (not chown). The air supply liuc 2M, however, terminates in a twoivay valve Mii (Figs. lo and lll operable to establish communication between liuc 2M and a pui! air supply' liuc 2H during ouch time that valve lill is actuated under control oi pull.' control i .caros to be described later and to establish communicatlon between line 20# and a blo ply line 20B during the time the gatherir'l'gr gaz is over the mold at which time valve i" is under control of a blow switch TIS (Fig. 7) actuated as the mold is closed about the parison. The vacuum valve is mechanically opened by a Vlever |51 (Fig. l5) which is pivotally secured to the racket 4|18 by bolt I" and has its Ires end Ill' forked to accomodate a trunnion block 2 0 car-l ried by the stem |85 of the vacuum valve. The lever |51 is raised, to actuate the vacuum valve to connect the vacuum line 205 (Fig. 2) in communication with the gathering cup 48, by a lug 2H (Fig. 15) secured to rack ||5 of the shear driving mechanism and in such position thereon that the lever |51 is operated near the end of the up stroke of this rack, which occurs as the cup 40 is being lowered intothe supply body of glass. The vacuum valve is thereafter held in the open position independently of lug 2|| by latch 2|5 (Figs. 14 and 15) mountedon a bracket 2|6 and rotated by a spring 2|1 under an edge of trunnion block 2| 8 as it comes up. An arm 2|8 of latch 2|,5 is in the path of movement of a pin A 2|9 in fixed relation with the armature 22| of the atmosphere valve solenoid 222 which, upon energization, opens the atmosphere valve |86 and through the medium of pin 2| 9 trips latch 2|5, allowing the vacuum valve to close. Energizetion of solenoid 222 is under the joint control of a switch 504 of the timing `mechanism I6 (Fig. 24) and a switch" 23| (Fig. 4a) and is arranged to occur just after the chuck Jaws have closed about the gathering cup 48 and before the plunger solenoid |18 starts lowering the plunger |65. This is accomplished by so setting the actuating member 232 of switch 23| on rod 6| that I 81, it is provided with a thumb screw'228 (Fig.

3) having a right and lefthand thread, one end of which enters a plug in communication with the valve through its hollow stem |812, the other end of which is threaded into stem |81'.

Head elevating and lowering;

The motorized gear reduction unit 3| (Figs. 2, 5, 5a, 5b and 6) for elevating and lowering the head assembly, is fixed to a plate 235 which is 'secured directly to the top of the turning post 29. A ratchet wheel 238 is keyed to the shaft 231 of this unit, which shaft also carries a bell crank m med into the r zao' ment with a stop 255 and the lower end into the path of movement of the long arm of the bell crank, which is notched to receive the lower end of this latch.

When the solenoid 241 becomes energized, its armature 246 is pulled up and the stop .244 operates to release the pawl 24| which is instantly pulled down against the ratchet wheel by its spring. The-ratchet Wheel, which is constantly rotating, thereafter carries the pa'wl and crank with it, as illustrated in Fig. 5b. Before the pawl and bell crank have traveled one revolution, the

,energizing circuit for the solenoid is opened so that its armature again allows the stop 244 to move into the path of the pawl which is accordingly brought to a positive stop upon completion of one revolution. The bell crank, of course, is prevented from backing up under thespring action o f the pawl by the swinging of latch 25 into the notched end of the bell crank arm just before it is stopped by engagement of the pawl with stop 244. Thus it will be understood that each time the solenoid is energized the bell crank makes one complete revolution and through connecting rod 239 and rocker arm 25 imparts the hereinbefore described elevating and lowering movement to the gathering head assembly.

'Mold carrier and actuating assembly The mold equipment ofthe machine (Figs. '7-l1)comprises mold halves l3| 8 and 3 9, mounted on carriers 328 and 32| by means of suitable adapter plates 322l (Figs. '1 and 8). These carriers have slides 328' and '32|' secured thereto resting on side rails 323 mounted on a carrier frame 325. Secured to opposite sides of the slide rails vare baille plates 326 which shield the slide rails from water and glass particles. Attached 238 that is free to turn on the shaft. ,The conv necting rod 239 for imparting rocking movement to rocker 'arm 25 extends between such ami and the short arm of the bell crank. On the long arm df the bell crank is mounted a pawl 24|. A spring 242 tends to hold this paiwl in engagement with the ratchet wheel, but such engagement is normally prevented by a movable stop A244 pi-votally supported on plate 235 and having an arm 245 coupled to the amature 246 of a solenoid 241 by a link 248. A pin 258 carried by the long arm of the bell crank limits the movement of the pawl 24| in the disengaging direction. In order to prevent retrograde movement of the bell crank following the stopping of the rotation thereof on engagement of the pawl arm 24|' with latch stop 244, a latch 25| is provided. This latch is pivotally mounted on a post 252, carried by plate 235, and carries a spring 253 which swings the upper end of this latch into engageracks 33|!` and 33| which engage with a pinion gear 332 mounted in suitable bearings (not shown) pressed into the carrier frame325 and a cooperating cover 333.` Rack 338 is the driving or operating rack and carries on 'the underside thereof as plate 335 (Fig. 8) having a depending lpost 336 which carries one end of a connecting rod 331 (Figs. 8, 10 and 11) the other end of which is connected to a bell crank 311 of a mold opening and closing assembly generally designated 34|. This assembly, by imparting back and forth movement to rack 338, transmits suchmovement through pinion gear 332 to rack 33| in the opposite direction, thereby eiecting opening and closing movements of the two mold halves. Attached to the outer end of rack 33| is a cross arm 342 carrying adjustable bumper screws, one of which operates the blow control switch |89 and the other of which operates a plunger control switch 2l2, hereinafter referred to.

The mold opening and closing assembly includes a. drive motor 38 and an associated gear reduction unit 316. Free to rotate on a shaft of this 'unit is the previously referred to bell crank 311.

This .beu crank is provided with a pawl :so (Figs.

10 and 11) which, under the influence of a spring two movable stops 386 and 381 arranged 180 apart on a fixed plate 388 mounted on the gear reduction unit, and one of two associated spnng biased latches 389 adapted to prevent retrograde movement of the bell crank as would otherwise be possibley when the pawl 300 clears the ratchet wheel. The movable stops 330 and 381 are linked to armatures 33| and 332 (Fig. 11) or solenoids 303 and 394. When a movalble stop, for example, stop 3", is engaged by the arm 330' of the pawl` 330 and' the associated solenoid 344 becomes energized, the stop is withdrawn from the path of movement of the pawl permitting it to engage the rotating ratchet wheel 342. 'I'he bell crank is accordingly rotated. As 180 rotation is being completed the bell crank slides past the other latch 330 and pawl arm 330' engages the other movable stop 301 Awhich disengages the pawl from the ratchet wheel. A pin lll (Fig. 10) pressed into the bell crank is engaged by the pawl Just after the pawl clears the ratchet wheel and prevents over-travel of the bell crank. It is substantially at this time that the associated latch 343 drops back of the bell crank to prevent its possible retrograde movement. Thus the bell crank .is made to come to rest at two definite positions corresponding to the opened und closed positions of the mold and is held there until solenoid 332 is energized at the proper moment of the machine cycle.

Ware and mold cooling Ware cooling equipment is provided and comprises two air nozzles 343 (Fig. 9) mounted on diagonally opposite comers of the mold carrier frame. and clamped in plates 344 that swivel on DOBts 340 which are made adjustable in order to take care of dlii'erent size ware. These air nozzles by action of springs 301 are made to bear against guiding plates 343, fastened to each mold half, and are connected to a suitable air supply line (not shown) by nexible tubing.

The mold halves are cooled by water ejected from a nozzle 341 (Fig. 9a) connected to a pipe 340 communicating with a water line 31| through a tiexible hose. The pipe 34| is supported on one arm o! a bell crank 31|, the other arm of which is connected to the turning post 2s by a link :t4 (Figs. 2 and 9b) so that after the mold halves are separated and-as the turning post is rotated t o swing the gathering head assembly toward the forehearth, it swings the nozzle between the mold halves. As will be more fully described later, a valve 314 (Figs. 16 and 17) controls the water supply to nozzle 341.

Swing mechanism As has been previously explained. the gathering head assembly, after gathering a charge of glass, is conveyed by rotation o! the turning post 2l to a position over the mold assembly and subsequently returned to the gathering position. These movements are brought' about by swing mechanism which includes a motorized gear reduction unit 40| (Figs. 1, 18 and 19) secured directly to the carriage (Fig. l). A ratchet wheel 402 iskeyed to a shaft 403 which extends entirely through the reduction unit. Adjacent the ratchet wheel 402 a bell crank 404 is mounted for i'ree rotation on the shaft. An arm oi this bell crank is provided with a crank pin 403 which carries a connecting rod l (Figs. 1, 2, 18 and 19) the other end o! which connects with a sector gear 444 (Fig. 1) pivoted to a post 441 mounted on the carriage |I `and in mesh with a similar gear 40| secured to the lower end of the turning post 2l. The arrangementis such that for each one-hal! revolution o4 the bell crank. est 24 mold assembly. When the is rotated through an arc of approximately The bell crank is'driven by the ratchet wheel 402 through a pawl 4|0 carried by the bell crank and under the influence of a spring 4| i. A tripping mechanism for the pawl is mounted on a plate 4|2 secured to the reduction unit. This mechanism includes a bracket 4|3 (Fig. 19) bolted to the plate and supporting a. swing solenoid 4|4. The armature 4|5 of this solenoid is linked to one arm of a trigger 4I1, the other arm 4|1' of which passes through an aperture in a tie bar 420 extending between two pawl latches 42| and 422 mounted on plate 4|2 and located 180 apart. Stops 423 also carried by this plate are provided to limit the travel oi' the latches. A spring 4| 6 extending between the tie bar and plate 4|2 holds the latch 422 in inoperative relation with respect to the paw] 4|0 and latch 42| in operative relation therewith so long as the solenoid remains deenergized. The operating circuit ol the swing solenoid is under control of switch 503 ol the timing mechanism. hereinafter described. 'With the swing solenoid #it deenergizeti, the gathering head assembly is positioned over the solenoid becomes energized its armature 4|5 actuates trigger 4|1, thereby withdrawing the latch 42| from engagement with the pawl and moving latch 422 into the path of movement thereof. As the pawl is released, it engages with the ratchet wheel which immediately rotates the pawi and bell crank with it for whereupon the pawl strikes the latch 422. This disengages the pawl from the ratchet wheel and stops it and the bell crank with the connecting rod 405 4in such position that the gathering head assembly has been moved to the gathering station, where it remains until such time that the solenoid 4|4 again becomes deenergized. When this occurs the pawl will again be allowed to engage the ratchet wheel and will accordingly be rotated 180 to the starting position where the pawl is again disengaged from the ratchet wheel and brought to a stop in its initial position with the gathering head assembly at the molding position,

The lower end o! shaft 403 of the motorized gear reduction unit 40| carries a pulley 425 (Fig.

2) for imparting rotary movement to the blowhead spindle 35 during such time that the spindle is at the molding station. The drive is effected through a belt 428, a pulley 421 (Fig. 2a) carried by a stub shaft 424 having a gear 420 at its upper end engaged by a gear 420, on the lower end of a shaft 430 carried by the turning post, just as the gathering head arrives at the melding station. As will be observed from Fig. 2a, the stub shaft 424 is resiliently mounted to permit it to give way if necessaryas gear 428 engages it. A pulley 432 on the upper end of shaft 43| imparts rotary movement to the spindle 3l through a. belt 433 and pulley 42. Other equipment closely associated with and operated by the turning post comprises a quadrant assembly (Figs. 16 and 17) the functions of which are to actuate thc puf! control switch |38, a plunger lowering control switch 202 and a head elevating control switch 230. The quadrant also actuates the pull and blow air supply valve 30| as required to supply pui! and blow air to the pull' and blow valve at the proper times, and, as will more i'ully be brought out later, opens and closes y,the supply valve 31s through which cooling iiuid is fed to the mold cooling nozzle 381 (Figs. 9 and

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