US3867122A

US3867122A - Shut off system for glassware forming machine

Info

Publication number: US3867122A
Application number: US333655A
Authority: US
Inventors: Joseph P Miller
Original assignee: Newfrey LLC
Current assignee: GLASS MACHINERY Inc A Corp OF
Priority date: 1973-02-20
Filing date: 1973-02-20
Publication date: 1975-02-18
Anticipated expiration: 1992-02-18
Also published as: GB1448783A; DE2405815C3; FR2218294B1; AU6504374A; JPS49117509A; JPS539606B2; DE2405815A1; DE2405815B2; CA1027369A; FR2218294A1; IT1008906B; AU476139B2

Abstract

A system is disclosed for achieving complete shut down of one section of a typical Hartford I. S. type glassware forming machine. Opening an emergency valve associated with a single section provides a secondary air pressure source to a pneumatic system which controls a sequence of events opening movement of both blank and blow molds, return of the scoop to an inactive position, the invert and take-out to stop, and the various other components to return to their inactive positions. Another version of the system permits shut down of the entire multi-section machine.

Description

1111mm States Patent 1191 Miller Filed:

SHUT OFF SYSTEM FOR GLASSWARIE FORMING MACHINE Inventor: Joseph P. Miller, Tariffville, Conn.

Assignee: Emhart Corporation, Bloomfield,

Conn.

Feb. 20, 1973 Appl, No.: 333,655

U.S. c1. 65/159, 65/229 1m. (:1 c0311 9/40 FieldofSearch "GS/159,229

References Cited UNITED STATES PATENTS 6/1950 Walling .1 65/159 X 6/1973 Faure et al 65/159 1111 3,867,122 [451 Feb. 18, 1975 Primary Examinr-Arthur D. Kellogg v Attorney, Agent, or FirmMcCormick Paulding & Huber y r [57] ABSTRACT A system is disclosed for'achieving complete shut down of one section. of a typical Hartford l. S; type glassware forming machine. Opening an emergency valve associated with a single section provides a secondary air pressure source to a pneumatic system which controls a sequence of events opening movement of both blank and blow molds, return of the scoop to an'inactive position, the invert and takeout to stop, and the various other components to return to their inactive positions. Another version of the system permits shut down of the entire multi-section machine.

9 Claims, 11 Drawing Figures sup Z PATENTED FEB] 81975 SHEET 10F 3 Pmmsmw 3,867,122

SHEET 20F 3 SHUT OFF SYSTEM FOR GLASSWARE FORMING MACHINE BACKGROUND OF THE INVENTION scends in the fixed chute toward the upwardly openblank mold where a movable funnel guides its entry into the blank mold cavity. Both the funnel and the split blank mold sections are also pneumatically operated, and controlled by the timing drum. A movable baffle or settle blowhead closes the blank mold cavity after the funnel is retracted so that a plunger can press the gob upwardly to form a blank or parison in the blank mold. The baffle and plunger are also pneumatically operated, and controlled by buttons or lugs on the timing drum. The neck of the parison is formed in a split net ring mold which is also movable and cooperates with the blank mold to define the parison. The neck ring molds are not only movable toward and away from another, but also comprise an essential element of the transfer for moving the parison from the blank mold to the final or blow mold. This transfer inverts the parison and is accomplished by an invert air cylinder controlled by the timing drum, and the pneumatic cylinders for Another aim is to provide a shut down system for all of the machine sections by manipulating no more. than one valve.

SUMMARY OF THE INVENTION This invention relates generally to the glassware machinery art, and deals more particularly with a novel emergency shut off system for a pneumatically operated machine of the type which has several sections I each controlled by a rotating timing drum through a system of lever actuated tappet valves which control the distribution of a main air supply to-the various pneumatic machine components.

A source of secondary air is adapted to close a spool type shut off valve in the'main air supply line, and to vent the line to the valve block manifold of an associated machine section when a lever type emergency valve is opened. This secondary air pressure is used to activate certain of the double acting air cylinder operated machine components such as those associated with opening the split blank and split blow molds. The

pneumatic clutch associated with the timing drum is also disengaged to stop the operation of the tappet valves, and certain other machine components are pneumatically operated to their inactive positions, such as the funnel, the baffle, the blow head and the scoop.

A shut off system for the entire machine is adapted to use the same source of secondary air to simultamoving thesplit neck ring mold and for moving the split blow mold are also controlled by buttons on the timing drum. After the blow mold has closed around the parison and the neck ring mold has released it for return motion to pick up another parison, a movable blow head descends onto the blow mold and air is blown into the parison cavity, all under control of the timing drum and its associated tappet valves. Finally, the blow mold opens and a tong type take-out picks the ware up by its neck to deposit it on a deadplate.

Each machine section, as described above, has its own timing drum and several such sections are generally provided to be operated in phased relationship with one another by providing a common drive for all of such drums. The Ingle U.S. Pat. No. 1,911,119 illust-rates this basic concept, and also discloses the use of an individual pneumatically operated clutch to permit disengaging the drum of one machine section by turning a manual valve lever. This lever will direct air to the clutch, and also to the scoop to retract the scoop and assure that no gobs of glass are fed to that particular machine section. In addition, a manual air supply shut off is disclosed in Ingle patent for depriving each individual section of the machine of its source of power.

The general purpose of the present invention is to provide an improved shut off system capable of efficiently shutting down each machine section, and which system also includes means for simultaneously shutting down the several sections ofa typical I .S. machine. The existing shut down valve and clutch control lever are retained, but an additional optional section shut off valve is provided for shut down of a particular machine section, and a machine shut off is provided for efficiently shutting down an entire machine.

neously shut down all machine sections in response to manipulation of a single emergency valve, through a control circuit utilizing some of the same lines provided for shut down of the individual machine sections.

BRIEF DESCRIPTION OF THE DRAWINGS I FIG. 3 is a detailed view of the lever operated emergency valve of FIG. 1. 7

FIG. 4 is a front view of the FIG. 3 valve. FIG. 5 is adetailed view of the manual and pneumatic control for the clutch shown in FIG. 1 for disengaging the timing drum.

FIG. '6 is atop view of the FIG. 5 device. FIG. 7 is a detailed view of the valve block of FIG. 1.

FIG. 8 is a schematic diagram of an alternative system whichwill permit shutting down all of the several sections of a typical Hartford I. S. glassware forming machine.

FIG. 9 is a detailed view of a shuttle valve in one of the lines in the schematic view of the single section system of FIG. I.

FIG. 10 is a detailed view of the machine shut down valve shown .in FIG. 8.

FIG. 11 is a detailed view of the main air supply machine shut off valve.

. DETAILED DESCRIPTION OF FIRST EMBODIMENT The description of the apparatus shown in sheets 1 and 2 of the drawings relates to the basic Hartford I. S.

3 type glasswareforming machine as described in detail in U.S. Pat. No. 1,91 1,119 issued'tolngle. As described in the Ingle patent this style of glassware forming machine is constructed of a plurality of independent sections which may be timed to be automatically operated in slightly different phase with one another and to be fed gobs of molten glass from a single feeder. The charges, or gobs ofglass, are successively distributed to the various sections in a predetermined order. As described in the Ingle patent the machine includes a molten glass gob distributing means for conducting the gobs of glass from the outlet of the feeder bowl to the various sections, and more particularly to the blank mold stations-in each of the machine sections. Suitable take-out means is also described for removing the finished ware from the blow mold station of each such section and placing it upon a suitable conveyor, or other receiving station such as a deadplate or the like where it is cooled prior to the conveyor for transfer to an annealing lehr. The basic operation of such a glassware forming machine is summarized in the background of invention hereinabove and need not be described in detail. In the description to follow the present improvements will be described with reference to the basic machine as disclosed in the Ingle patent.

Turning now to a description of the apparatus shown in FIG. 1, a main air supply to the I. S. valve block is shown in the upper right hand portion of FIG. 1 as comprising a supply pipe 12 which may include a conventional manual shut off valve 14 similar to that shown and described in the Ingle patent. Thus, the main supply pipe 12 normally supplies air under pressure to the valve block 10, .and through a plurality of tappet valves, such as shown at 16, in FIG. 7, operating airunder pressure is provided in the outlet lines, indicated generally at 20 in FIG. 1, to the various components of the glassware forming machine..The normal operation of these various components need not be described in detail herein, and the reader is referred to the disclosure in the above mentioned Ingle patent for a detailed description of the normal operation of these various components.

Briefly, each tappetvalve 16 isactivated through a system of levers and latches (FIG. 1) from protruding lugs or

buttons

21, 21 provided for this purpose on a rotating timing drum 22. As described in Ingle one timing drum 22 is associated with each particular machine section, and several of these drums are associated with the several such individual sections in a multi-section machine. All drums are adapted to be driven from a common shaft.

Each drum is adapted to be disengaged from its drive shaft by a pneumatically operated clutch 24 similar to the clutch shown and described .in the Ingle patent. During normal operation of the prior art machine, section supply air is provided through a manually operated valve 26 to the appropriate side of the piston in the clutch 24 for causing the timing drum 22 to rotate with the drive shaft 25. When the handle 130 of the manual valve 26 is turned in a counterclockwise direction from the on position shown in FIG. 6 to an of position (not shown), air under pressure is directed from the main air supply pipe 12 through the valve block and line 27 to the lower side ofthe piston in the pneumatically operated clutch 24, causing the drum to disengage from the shaft, and shutting down that particular machine section. A spring loaded plunger 28 is provided in the conventional Hartford I.S. machine in order to provide a lock for this valve 26 so that it is not inadvertently moved from its on position to its off position as described above. As presently operated, conventional Hartford [.S. machines are normally shut down by first pulling the plunger 28 so as to permit disengaging the clutch 24 by counterclockwise rotation of the handle of valve 26, and subsequently closing the main air supply valve 14 described above.

Generally, shutting down a typical I.S. machine in the conventional manner described above will stop the motion of the various mechanisms in whatever position they happen to be in at the time. The scoop will, however, be retracted, and those mechanisms which are spring returned to inactive positions will so move as soon as the valve block loses whatever air pressure is trapped in supply pipe 12. The time required for this will be dictated in large part by the degree of wear of those applicable air actuators which are spring returned. One of the chief aims of the improved shut down system disclosed herein is to permit the valve block to be vented instantly, so that these mechanisms will be moved to their inactive positions at once, regardless of the condition of the pneumatic components themselves.

The system to be described continues to permit shut down of a section in the conventional fashion hereinabove, but in addition, provides for an emergency shut down of the particular machine section which will result in instant movement of several of the various machine components to their inactive positions, and also provides for movement of the split blank and blow molds to their open positions, so as to permit ready access to the interior of these various devices.

In the presently preferred first embodiment of my invention a'spool type emergency valve 30 is mounted, for convenience, on the main air supply pipe 12 to the I. S. machine valve block 10, and this spool valve, best shown in FIG. 3, is air operated from a source of secondary air pressure in the line 32, which secondary air need not be associated with the main air supply in the pipe 12 mentioned above. An accumulator 34 is provided in the main line 32' which delivers the secondary air supply to the emergency spool valve 30 in order to provide a source of pressurized air in the event of total air pressure failure in the plant where the particular glassware forming machine is being run. This emergency source of air in the accumulator 34 assures that the emergency valve 30 can be effectively operated if required, and that the limit operation of the various components to be described can be achieved.

The emergency spool valve 30 best shown in FIG. 3, comprises a two position valve which either, isolates secondary air pressure in the infeed line 32 and accumulator 34 when the valve element 36 is in its closed position, as shown generally by the broken lines of FIG. 3, or is adapted to provide secondary air pressure in the line 38 when the spool valve is moved to its solid line position shown in FIG. 3. The spool valve 30 is lever operated in a manual fashion by the machine operator, and the lever 40 can be pulled downwardly to open the valve, and a locking bar 41 holds the valve in its open condition as shown in solid lines in FIG. 4. The bar 41 is pivotally mounted as shown and a spring 42 will-automatically move the bar 41 into position for locking the lever in its open condition. Before reclosing the valve, the operator must first hold the bar to one side, as suga gested by the broken lines of FIG. 4, and then the lever 40 can be raised to the broken line position of FIG. 3.

Still with reference to FIG. 3, the spool valve 30 also includes an upper chamber 44 which is adapted to provide an alternative means for opening the valve 30. It will be apparent that if line 46 is pressurized such as by the auxiliary emergency valve 50 best shown in FIG. 1,"

the valve element 36 of the primary emergency valve 30 will be raised from its broken line position shown to its solid line position thereby opening the emergency spool valve 30 and allowing secondary air under pressure to be provided in the line 38 as described above. The pilot valve, or auxiliary emergency shut off valve 50 operates from a source of pilot air pressure 51, and comprises a conventional push type spool valve which is spring biased to isolate line 46 from the pilot pressure 51 but which valve when depressed by the operator will shift valve 30 as surely as ifthe lever 40 were pulled by the operator. This feature of the present invention permits actuation of the emergency section shut off system by a machine operator whethersaid operator happens to be located at the back of the machine on the side of the timing drum, or at the front of the machine where the take-away conveyor is located.

,Whenthe machine operator either pulls the lever 40 of the main emergency shut off valve 30, or depresses the auxiliary valve 50, it will be apparent that secondary air under pressure is provided in the secondary air manifold line 52, best shown in FIG. 1. This manifold line 52 provides secondary air pressure to a spool valve 54 best shown in FIG. 2, and also to other areas associated with the valve block and timing drum to be described. The spool valve 54, best shown in FIG. 2 is provided .in the main air supply pipe 12, and when opened allows normal air supply to the valve block for normal operation of the machine. When the secondary air pressure is directed through line 52 to the inlet end of the spool valve 54, the valve element will shift from the solid line position shown in FIG. 2, to that depicted in broken lines, isolating the valve block 10 from the main air supply. In addition, that portion of the main air supply pipe 12 located between this valve 54 and the valve block 10 will be vented to atmosphere through a port 56 when the valve element'58 is shifted from the solid line to the broken line position shown in FIG. 2. A return spring 60 is provided in this spool valve 54 for returning the valve element 58 to its normal solid line position, when the secondary air pressure is removed as by closing of the emergency shut off valve described above. Thus, the emergency valve 30 is adapted to not only provide pressure in the secondary air pressure manifold 52, but'also to vent the nor mally pressurized supply manifold 59 in the valve block 10.

Still with reference to FIG. 1, the secondary air pressure manifold line 52 also provides secondary air pressure in a branch line 60 located in parallel relationship with certain of the tappet valves in the valve block 10 to permit actuation of certain of the glassware forming machine components in spite of the fact that the main supply manifold 59 of the'valve block 10 has been vented as described .above. More particularly, the branch line 60 when pressurized will provide air under pressure in the output lines 62 and 64 associated with the valve block 10, and thereby move associated pistons 66 and 68 respectively associated with the blow and the blank mold arms 70 and 72 causing these arms secondary air pressure from reaching the normal supply manifold 59 of the valve block 10, the needle 'valve 17 will be set so as to restrict normal flow in the opposite direction during normal operation of the machine, and hence will also restrict the reverse flow during secondary air pressureoperation of these blow and blank mold moving pneumatic cylinders. In addition, not all of the tappet valves will be open. at the time that the lever 40 or button valve 50 is opened.

It is quite desirable to achieve this opening movement of the blow and blank mold holder arms and 72. However, other double acting; pneumatic cylinders in the glassware forming machine, such as the scoop operating cylinder 75, should be similarly moved in one direction, to retract the scoop to its inactive position for example, thereby precluding the delivery of molten glass gobs to the associated machine section. Since the scoop cylinder 75 is controlled by a pilot valve 80, rather than'being energized through an output line from the valve block 10, the line a from the valve block 10, associated with the pilot valve 80 when vented, permits the valve element to be urged to the position shown by spring 80b allowing high pressure in line 800 to reach the scoop cylinder 75 and to move the piston for retracting the scoop. Thus, whether a pneumatic cylinder is adapted to directly move the associated glassware. forming machine component, or whether such component is actuated through a pilot valve such as shown at 80 in association with the scoop cylinder 75, the present-invention permits movement of a particular machine component to some predetermined limit position.

Other double acting pneumatic cylinders are associated with the take-out apparatus, indicated generally at 82 in FIG. 1, and with the invert movement of the neck ring arm,-indicated-generally at 84 in FIG. 1. It is desirable with these particular double acting pneumatic cylinders to have such components stop inwhatever position these components happen to occupy at the time when the emergency valve 30 is opened. Thus,

lines

88 and 89 associated with the invert cylinder 86 are vented through the above mentioned venting of the valve block 10. The same result is obtained with respect to the lines 92 and 94 associated with thetakeout cylinder 90. These lines are also vented to atmosphere through the valve block ll0 when emergency valve 30 is opened.

Other components of the glassware forming machine will preferably be returned to their inactive positions, and where these mechanisms are operated by double acting pneumatic cylinders this can be accomplished in a manner similar to that described herein-with reference to the blow and blank mold arms 70 and 72 respectively. However, where these mechanisms are pneumatically operated in one direction and spring returned in the opposite direction, the venting of the pneumatic line associatedwith that particular mechanism will permit the spring to return these components to their inactive positions. The take-out mechanism 82 not only includes the double acting pneumatic cylinder 90, for oscillating the take-out arm, but also includes a springreturned cylinder 83 for actuation of the tongs. The springs will move the tongs to open whenever the cylinder 83 is vented to atmosphere through the valve block 10. Still another example of this spring return type of pneumatic one-way actuator is that shown at 100 in FIG. 1.

Thefunnel mechanism 100 serves to guide the gob of glass as it is dropped into the upwardly open blank mold cavity defined by the closed blank mold, and is operated from a spring return type of pneumatic cylinder 102 through the line 104 from the valve block during normal operation of the machine. Actuation of this mechanism 100 at the appropriate time is controlled by the rotating timing drum 22. When the emergency valve 30 is opened by the machineoperator, and main air supply pipe 12 is vented to atmosphere, no pressure will be available in the line 104 to operate the funnel mechanism 102 and in fact this line 104 will be vented, with the. result that the spring will tend to return the funnel mechanism 100 to its inactive position remote from the blank mold.

The baffle cylinder 106 is controlled by the pilot valve 108, and thespool valve element is biased to the position shown in FIG. I. Pressurizing line 110 through the valve block 10 will shift'the spool valveupwardly against the force of the spring and allow high pressure air in line 1100 to move the piston in air cylinder 106 downwardly. This will move the baffle to its active position during normal machine operation. When the valve block 10 is vented, the spool valve assumes the position shown and the cylinder moves the baffle to its inactive position.

The blow head cylinder 114 associated with the blow head 116 is controlled in a substantially similar fashion to that of the baffle 112 just described and need not be described in detail. Pilot valve 118 is similar to the valve 108 associated with the baffle operating cylinder 106, and when the valve block 10 is vented, line 120 vents the spool valve and the element assumesthe position shown allowing high pressure air to actuate the pneumatic cylinder 114 to achieve movement of the blow head to its inactive position.

Although not specifically described herein, other glassware forming machine components can be similarly controlled to be conveniently moved to their least offensive position from the point of view of'safety to the machine operator. For example, the normal vertical motion of the plungers (not shown, but associated with the forming of the glass parison) can be similarly controlled to cause these plungers to assume either a down'position, or to remain in their last occupied position, at the time when the emergency valve 30 is opened. The same is also true of the .operation of the various cooling air nozzles in a typical glassware forming machine. The'valves controlling the cooling air can be closed. So too, when the machine is set up for blow and blow process. the thimble associated with the blank forming plungers can be controlled in the same way as the associated plungers.

Still with reference to FIG. 1, and in keeping with one ofthe objects ofthe present invention, to provide a single emergency valve which can be manipulated by the machine operator to shut down an individual machine section in a very efficient manner, the secondary air supply manifold 52 also includes a branch line 122, which provides air under pressure to the appropriate side of the piston in the pneumatic clutch 24 to cause said clutch to disengage the timing drum 22 from its associated drive shaft. Thus, the timing drum is stopped as a result of opening emergency valve 30 in much the same manner as was formerly accomplished by rotating the control handle of valve 26 in a counterclockwise fashion as described hereinabove. The plunger detent device 28 is associated with this valve 26, and means is also provided for retracting, or deactivating the plunger 28 whenever the emergency valve 30 is opened to shut down the machine section. As best shown in FIG. 1 a branch line 124 of secondary air pressure manifold 52 directs air to a small piston 126, best shown in FIG. 5, to pull the plunger 28 pneumatically. A coil spring 128 biases the handle 130 to open the valve 26 when the plunger is so moved. Thus, the valve 26 can be either manually actuated. or pneumatically actuated stopping rotation of the timing drum, and also preventing it when the machine is again started up by the machine operator. This assures that he must follow his normal procedure-as described in the Ingle patent, reclosing of the emergency valve 30 willnot start the section automatically.

DETAILED DESCRIPTION OF ALTERNATIVE EMBODIMENT The above described system relates to the safe shut down of a single section of the Hartford I. S. type of glassware forming machine, one of thechief advantages of which is that each of the various sections'are somewhat autonomous. The system shown in FIGS. 8, 9, l0 and 11 provides for the shutdown of all sections in such a machine, and does so simply upon the actuation ofa single machine emergency valve. It will be apparent, however, that the system to be described requires that all of the individual sections of the machine be equipped with the above described section shut down system.

Referring now to FIG. 8 in detail, the basic system of FIG. 1, associated with each machine section, is depicted therein, but the main air supply has been omitted for clarity. The section emergency valve 30, which may be mounted on themain air supply pipe, has however been shown with its secondary air pressure vinput line 32 and output line 38. The line 46a corresponds to the line 46 of FIG. 1, but carries a different reference numeral because instead of being directly connected to the auxiliary section emergency valve 50, this line 46a communicates with a shuttle valve 200. This valve 200 serves to permit the line 46b to communicate with the line 46a as long as no pressure is present on the righthand end of the shuttle element 202. When line 204 is When the entire machine is to be shut down, as in the case of an emergency which will not permit ascertaining which one of the several machine sections should be shut down, providing air pressure to line 204 which will move shuttle element 202 to the left in'FIG. 9, and providing air to the chamber 44 of the valve 30 opening said emergency valve for the section of FIG. 1, and as a result of a manifold 206 extending the entire length of the machine, all of the emergency section valves are similarly opened by lines 204a, 204b, etc. I To pressurize this manifold 206a spool valve 220 "is provided between the manifold 206 and a source of air pressure, such as the main air supply 12a. This valve is normally closed, as shown in FIG. 11, but can be opened if air under pressure is available in common line 210. Pressure in common line 210 is selectively available through any one 212 of a plurality of

branch lines

212, 214, 216 etc. under the control of a machine emergency valve 218 located at the front of the machine. Several such valves are provided at the front of the machine, each being associated with one of the

lines

214, 216 etc. so that the entire machine can be shut down from a number of locations. A similar set of machine emergency valves 218a is provided at the rear of the machine for pressurizing lines 224, 226 or 228 respectively. Any one of these

valves

218 or 218a provides air pressure in line 210, opening the valve 220 and pressurizing the manifold 206. Since all of the machine sections have a

line

204, 204a, 20412 from this manifold 206, all of the individual section shuttle valves 200 will be moved to provide air on the

lines

46a, 46 a opening all of the individual

section emergency valves

30, 30 shutting down all of the various sections in the machine simultaneously, and as a result of manual actuation of a single valve.

FIG. shows such a valve 218 in detail. The valve element comprises a manually slidable element which has an inlet port connected to' a source of air pressure similar to the secondary air pressure source described above with reference to the accumulator 34 in the FIG. 1 machine section pneumatic circuit. The outlet port of this valve is connected to the line 212 but with the valve element held in the closed position, as shown by the ball detent mechanism, no air will be available in line 212 to pressurize the common line 210 associated with the valve 220. By pushing on the manual button one will reposition the valve element and the ball will engage another detent to hold the valve open. Thus, common line 210 will shift the normally closed valve 220 to open and open all of the section emergency valves 30, as described above.

I claim:

1. In. a pneumatically operated mechanically controlled glassware forming machine wherein a rotating drum isassociated with a system of levers and latches to actuate tappet valves in a valve block to selectively direct air to the various pneumatically operated components of the machine; the improvement comprising:

a. main air supply means including a supply manifold in said valve block,

b. a shut off valve in said air supply means, said shut off valve being normally open and pneumatically closed,

c. a pneumatically controlled clutch for said rotating drum, said clutch being normally engaged to rotate the drum and pneumatically disengage to stop its rotation,

cl. a secondary air pressure manifold for said pneumatically closable shut off valve and said pneumatically disengageable clutch,

e. a normally closed manually openable emergency valve for selectively connecting said shut off valve and said clutch to said secondary manifold f. a manually operable member associated with the pneumatic clutch for said rotating drum to permit the drum to be manually disengaged without use of said emergency valve. spring biasing means for urging said member towardits disengaged position, a spring loaded plunger for engaging a detent in said member to hold the member in its engaged position, pilot valve means for said plunger. and a branch line of said secondary pressure manifold communicating with said pilot valve to automatically release said plunger from its detent and to let said member move toward its disengaged position when said emergency valve is opened.

2. The combination recited in claim 1 further characterized by a branch line of said secondary pressure manifold located in parallel with certain of said tappet valves in said valve block whereby opening said emergency valve also serves to actuate certain of said machine components.

3. The combination recited in claim 2 furthercharacterizied by said certain pneumatically operated machine components comprising the mold opening and closing cylinders, which cylinders are normally air operated from said main supply under the control of said timing drum for mold opening and mold closing movement, said secondary manifold branch line serving to actuate said cylinders to open said molds when said emergency valve is opened.

4. The combination recited in claim 3 further characterized in that said main supply air shut off valve comprises a spool valve which vents said main supply and hence said valve block manifold when closed pneumatically'by said secondary air through said emergency valve.

5. The combination recitedin claim 4 further characterized by certain other pneumatically operated machine components comprising a double acting invert cylinder for moving a neck ring arm from'a blank mold station to a blow mold station in the machine and also for returning said neck ring arms, said vented valve block manifold serving to .vent both sides of said invert cylinder whereby the neck ring arms are stopped in whatever position they. have when said emergency valve is opened.

6. The combination recited in claim 5 further charac- 4 terized by still other pneumatically operated machine components comprising a double acting ware. take-out terized by still other pneumatically operated machine components comprising a funnel operating cylinder normally spring biased to move the funnel to its inactive position and normally air operated to mate the funnel with the blank mold, and said vented valve block manifold also serving to vent the pressure side of said funnel cylinder to cause the funnel to move to its inactive position when said emergency valve is opened.

8. The combination recited in claim 4 further characterized by still other pneumatically operated machine components comprising double acting cylinders for the reciprocable scoop, the blow head and the baffle, and a spring biased pilot valve for each of said double acting cylinders, said vented valve block manifold serving to vent the pressure side of said pilot valves whereby opening said emergency valve serves to retract said scoop, and to move said blow head and said baffle to their inactive positions.

9. The combination recited in claim 1 further characterized in that said emergency valve comprises a spool valve which opens an auxiliary emergency valve remote from said first mentioned emergency valve, and pneumatic means connecting said auxiliary and said first emergency valves whereby opening said auxiliary valve pneumatically opens the first emergency valve.

Claims

1. In a pneumatically operated mechanically controlled glassware forming machine wherein a rotating drum is associated with a system of levers and latches to actuate tappet valves in a valve block to selectively direct air to the various pneumatically operated components of the machine; the improvement comprising: a. main air supply means including a supply manifold in said valve block, b. a shut off valve in said air supply means, said shut off valve being normally open and pneumatically closed, c. a pneumatically controlled clutch for said rotating drum, said clutch being normally engaged to rotate the drum and pneumatically disengage to stop its rotation, d. a secondary air pressure manifold for said pneumatically closable shut off valve and said pneumatically disengageable clutch, e. a normally closed manually openable emergency valve for selectively connecting said shut off valve and said clutch to said secondary manifold f. a manually operable member associated with the pneumatic clutch for said rotating drum to permit the drum to be manually disengaged without use of said emergency valve, spring biasing means for urging said member toward its disengaged position, a spring loaded plunger for engaging a detent in said member to hold the member in its engaged position, pilot valve means for sAid plunger, and a branch line of said secondary pressure manifold communicating with said pilot valve to automatically release said plunger from its detent and to let said member move toward its disengaged position when said emergency valve is opened.

3. The combination recited in claim 2 further characterizied by said certain pneumatically operated machine components comprising the mold opening and closing cylinders, which cylinders are normally air operated from said main supply under the control of said timing drum for mold opening and mold closing movement, said secondary manifold branch line serving to actuate said cylinders to open said molds when said emergency valve is opened.

4. The combination recited in claim 3 further characterized in that said main supply air shut off valve comprises a spool valve which vents said main supply and hence said valve block manifold when closed pneumatically by said secondary air through said emergency valve.

5. The combination recited in claim 4 further characterized by certain other pneumatically operated machine components comprising a double acting invert cylinder for moving a neck ring arm from a blank mold station to a blow mold station in the machine and also for returning said neck ring arms, said vented valve block manifold serving to vent both sides of said invert cylinder whereby the neck ring arms are stopped in whatever position they have when said emergency valve is opened.

6. The combination recited in claim 5 further characterized by still other pneumatically operated machine components comprising a double acting ware take-out arm operating cylinder, said vented valve block manifold also serving to vent both sides of said take-out cylinder to stop the take-out arm in its last position when said emergency valve is opened.

7. The combination recited in claim 4 further characterized by still other pneumatically operated machine components comprising a funnel operating cylinder normally spring biased to move the funnel to its inactive position and normally air operated to mate the funnel with the blank mold, and said vented valve block manifold also serving to vent the pressure side of said funnel cylinder to cause the funnel to move to its inactive position when said emergency valve is opened.