US3376607A - Stripper actuating mechanism for differential pressure forming machines - Google Patents
Stripper actuating mechanism for differential pressure forming machines Download PDFInfo
- Publication number
- US3376607A US3376607A US573916A US57391666A US3376607A US 3376607 A US3376607 A US 3376607A US 573916 A US573916 A US 573916A US 57391666 A US57391666 A US 57391666A US 3376607 A US3376607 A US 3376607A
- Authority
- US
- United States
- Prior art keywords
- stripper plate
- mold
- plastic sheet
- differential pressure
- stripper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
- B29C51/26—Component parts, details or accessories; Auxiliary operations
- B29C51/30—Moulds
- B29C51/38—Opening, closing or clamping means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C33/00—Moulds or cores; Details thereof or accessories therefor
- B29C33/44—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles
- B29C33/442—Moulds or cores; Details thereof or accessories therefor with means for, or specially constructed to facilitate, the removal of articles, e.g. of undercut articles with mechanical ejector or drive means therefor
Definitions
- This invention relates generally to stripping mechanism for differential pressure forming machines and more particularly to mechanism incorporated therein for automatically withdrawing a stripper plate following a predetermined delay during which the mold with which it coopcrates is partially withdrawn.
- a stripper plate is associated with the female mold assembly and operates to initially hold the plastic web when the female mold is being withdrawn to strip the formed plastic articles therefrom. Once the formed articles have been fully separated from the mold cavities, the stripper plate itself is retracted.
- fluid pressure operated cylinders are provided to operate the stripper plate and require, of course, connections to a source of fluid under pressure and timing mechanism for insuring that the stripper plate is operated at the proper time.
- One of the prime objects of the present invention is to utilize linkage mechanism already existing in such machines for automatically actuating stripper retracting linkage and withdrawing the stripper plate at the proper time so as to render unnecessary such former fluid pressure systems and the timing mechanisms associated therewith.
- Another object of the invention is to provide positively operating stripper plate withdrawing mechanism of highly reliable character which operates simply and economically to perform its function.
- FIGURE l is a fragmentary, perspective elevational view of a differential pressure forming machine which incorporates the invention.
- FIGURE 2 is a transverse, sectional elevational view taken on the line 2-2 of FIGURE l;
- FIGURE 3 is a greatly enlarged, sectional side elevational view showing the actuating pin in engagement with an abutment member provided on the stripper retracting linkage;
- FIGURE 4 is a fragmentary, end elevational view of the stripper retracting linkage at a time when the stripper plate and mold are in fully extended forming position;
- FIGURE 5 is a similar view at a time when the mold has been withdrawn and the stripper plate is about to be retracted;
- FIGURE 6 is a similar view at a time when the stripper plate is being retracted.
- FIGURE 7 is a similar view at a time when the mold assembly has been substantially fully withdrawn.
- a letter F generally designates the frame of the machine which is shown as having side members 10' connected by an upper channel-shaped member 11 and a lower inversely dis posed, channel-shaped member 12.
- a double-acting, iluid pressure operated cylinder 13 having a piston rod 14 which is coupled at its lower end, as at 15, to an upper platen frame generally designated 16.
- the platen frame may comprise end members 17 and 18 connected by side members 19 and 20.
- the members 17 and 18 are also braced by intermediate cross members 21 and 22.
- a female mold box assembly generally designated 23 which includes female mold members 24 supported from the top wall 25 of the hollow assembly 23 by bolts 26.
- the mold assembly 23 is supported at its corners from the platen
- the female mold members 24 comprise separate cup-shaped inserts which extend freely through openings 30 in the stripper plate 29. The inserts also extend through and are sealed in openings 31 provided in the lower wall 32 of the mold assembly box 23, and a vacuum line 33 leading from a suitable source of vacuum, such as a motor operated vacuum pump, communicates with the female mold members 24 in the usual manner, such as through ports 34 provided therein.
- Similar clamp plates 39 secured by bolts 40 clamp a hollow male mold box assembly generally designated 41 to the end rails 42 and 43 of the lower platen assembly 38.
- the mold box assembly 41 includes an air manifold or air box 44 having ports 45 therein which assist in the forming operation in the manner described in the aforementioned copending application.
- An air line 46 may be provided in communication with a suitable source of air under pressure to provide air to the box 44 at the proper time.
- plug assist members 47 mounted by the air box 44 in vertical -alignment with the female mold members 24 are plug assist members 47 which, in the usual manner, are employed to initially deform the heated plastic web P and facilitate its entry into the female mold members 24.
- the stripper plate 29 is mounted for movement independent of the mold assembly 23 and is wtihdrawn only after the female mold assembly 23 has been moved a predetermined distance upwardly.
- Rod members 48 extending freely through openings 49 in the vacuum box central post supports 50 are connected to cross bars 51 as shown, there being coil springs 52 provided between the cross ⁇ bars 51 and the upper wall 25 of vacuum box assembly 23.
- the cross bars 51 connect support frame members 53 which are suspended by means of toggle linkage mechanisms generally indicated at 54 at each corner from support block members 55 which are xed to the upper frame channel member 11.
- Each linkage mechanism 54 includes at its upper end a pair of links 56 which at their upper ends are connected by a pin S7 to one of the support blocks 55 and also includes a link 58 which is connected between links 56 by a pivot pin 59 and is connected at its lower end to the members 53 by a pivot pin 60.
- the forming machine illustrated employs toggle linkage systems for locking the platens in molding position and exerting a preloading stress thereon urging the molds 23 and 41 in a direction toward the plastic sheet P during the molding operation.
- Outboard of the blocks 55 are support blocks 61 in vertical alignment with support blocks 62 mounted on cross braces 63 provided on the upper platen assembly 16.
- a double-acting, fluid pressure operated cylinder 64 at each end of the upper platen 16 is supported at its outer end between the blocks 61 and 62 by pairs of straddling toggle links 65 and 66 which pivotally connect to t-he cylinder at their converging ends at 67 and are pivotally connected to the blocks 61 and 62, respectively, by pins 68 and 69.
- each cylinder 64 connects with a block 71 and each block 71 is pivotally connected to toggle links 72 and 73 by a pivot pin 74.
- the lower platen assembly includes identical linkage mechanism in which identical parts have been given the same numerals except that the numerals have been primed, and these parts need not be independently described.
- toggle linkage associated with cylinders 64 can be employed to operate the stripper 29 and eliminate the considerable mechanism formerly necessary to do this job.
- a bar 75 which, as indicated in FIGURE l, mounts spaced apart abutment blocks 76 and 76a.
- Each pair of blocks 76 and 76a are actuated by pin 74, which has an extending end 74a projecting inwardly between each pair of blocks 76 and 76a, as shown in FIG- URES 1 and 3-7.
- each actuator block 76 includes a bore 77 within which is disposed a coil spring 78 and a pin member 79 having a conical end.
- the edges of the bore 77 are swaged inwardly, as at 80, to prevent the pin 79 from being inadvertently withdrawn from the bore 77.
- One or more clamp bolts 81a may be used to adjustably secure the block in place and extend through elongated slots 81 provided in the block 76.
- the construction of blocks 76a is identical and the pins 79 similarly extend toward pin ends 74a.
- the pin springs 78 have, of course, much less strength than the springs 52 mounted on the stripper support rods 49.
- FIGURES 4-7 particularly illustrate the operation of the linkages 54.
- FIGURE 4 shows the links in a position in which the mold box assembly 23 and stripper 29 are in fully down position and the pin end 74a is slightly compressing pin spring 78.
- the pin end 74a has fully engaged the block 76a, compressed the spring 78 therein, and slightly moved the links 56 and 58.
- the usual clamp plate assembly comprising perimetral clamp plate 82, which is connected by brackets 83 to the piston rods 84 of pressure tiuid cylinders 85, is employed in the well-known manner fully described in the aforementioned copending application.
- the cylinders and 64' are then operated to move the male mold assembly 41 upwardly to respectively engage the plastic sheet P and expand the links 65 and 66' ⁇ sheet P distended by the plug assists 47 into intimatev engagement with the cavities of the female mold inserts 24.
- cylinders 64 and 13 are actuated to respectively withdraw the mold assembly 23 and buckle the4 links 72 and 73.
- the pin ends 74a simply move in the space between abutments 76 and 76a from the position shown in FIGURE 4 to the position shown in FIG- URE 5 and during this time the stripper plate 29 remains in engagement with the plastic sheet P as the mold assembly 23 is withdrawing therefrom.
- the pin ends 74a do contact the abutments 76a and buckle the links 56 and 58, as in FIGURE 6, so that the pins 59 move out of center position, the compressed springs 52 are free to rapidly expand and bring the stripper plate 29 sharply up into engagement with the female mold assembly 23.
- the cylinders 35 and 64 are also operated to respectively withdraw the mold assembly 41 and buckle the links 72 and 73.
- the spring mounted pins provide a tolerance which eliminates the need for precise positioning of the blocks 76 and 76a. For instance, it is quite ditlicult to so position the abutments 76 and 76a so that the pins 59 are moved to center position by abutments 76a when the stripper plate 76a in such position that they are disposed rearwardly of the blocks 76 far enough to let the stripper plate 29. ⁇ come all the way back into tight engagement with mold assembly 23 when the stripper plate 29 is permitted to return.
- the spring pressed projections 79 in blocks 76a prevent the blocks 76a from obstructing the return of the stripper plate 29.
- a dilferential pressure forming machine frame means; a pair of opposing mold members supported thereby, at least one of which is mounted to be moved relatively toward the other to Ian extended Aposition adjacent a deformable plastic sheet therebetween; said movable mold member having cavity means to receive the plastic sheet therein; means creating a differential pressure on opposite sides of said plastic sheet to draw the sheet into intimate contact with said cavity means; stripper plate means associated with said movable mold; support means supporting said stripper plate means for movement independently of the movable mold and operable to effect withdrawal of said stripper plate means; and means hav- ⁇ t ing a lost motion connection with said support means operated when said movable mold is being withdrawn 1 from the plastic sheet, and only after a predetermined withdrawal thereof, to actuate said means supporting said stripper plate means and withdraw said stripper plate means.
- said means having a lost motion connection with said support means comprises mold locking toggle links operated by fluid pressure operated cylinder means to expandand 29 is down and still position the abutments urge said movable mold toward the other mold and having an actuating part operable to actuate said support means when said toggle links are contracted.
- said support means comprises expansible and contractile toggle linkage supporting said stripper plate means from said frame means; spring means compressed when said toggle linkage is expanded and said movable mold is in extended position substantially engaging the plastic sheet; spaced apart abutments are provided on said toggle linkage; and said means having ⁇ a lost motion connection includes a projecting part extending between said abutments and movable in a path of travel from one to another.
- said means having a lost motion connection with said support means comprises toggle links for locking said movable mold in extended position and said projecting part comprises the extending end of a pin pivotally connecting the toggle links.
Description
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US573916A US3376607A (en) | 1966-08-22 | 1966-08-22 | Stripper actuating mechanism for differential pressure forming machines |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US573916A US3376607A (en) | 1966-08-22 | 1966-08-22 | Stripper actuating mechanism for differential pressure forming machines |
Publications (1)
Publication Number | Publication Date |
---|---|
US3376607A true US3376607A (en) | 1968-04-09 |
Family
ID=24293917
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US573916A Expired - Lifetime US3376607A (en) | 1966-08-22 | 1966-08-22 | Stripper actuating mechanism for differential pressure forming machines |
Country Status (1)
Country | Link |
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US (1) | US3376607A (en) |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3504403A (en) * | 1967-03-20 | 1970-04-07 | Brown Machine Co Of Michigan | Differential pressure plastic forming machine partible mold mechanism for forming articles in a plastic sheet |
US3776681A (en) * | 1971-04-27 | 1973-12-04 | Standard Oil Co | Thermoforming apparatus |
US4130387A (en) * | 1974-03-05 | 1978-12-19 | National Can Corporation | Apparatus for thermoforming plastic articles |
US4162883A (en) * | 1974-03-05 | 1979-07-31 | National Can Corporation | Apparatus for thermoforming hollow article having a high L/D ratio |
US4255382A (en) * | 1980-03-20 | 1981-03-10 | Leesona Corporation | Thermoforming machine with automatically mechanically operated web stripping element |
US4273524A (en) * | 1978-10-18 | 1981-06-16 | Hull Corporation | Platen type molding press |
US4360335A (en) * | 1981-08-28 | 1982-11-23 | Sun Metal Products, Inc. | Molding press for semi-pneumatic tire bodies and the like |
US4376744A (en) * | 1980-09-02 | 1983-03-15 | Ptx-Pentronix, Inc. | Mechanical and fluid actuated ram for powder compacting press and method of compacting powder material |
US4685880A (en) * | 1985-06-18 | 1987-08-11 | American Hospital Supply Corporation | Cuvette belts and manufacture of same |
US5225213A (en) * | 1991-12-16 | 1993-07-06 | John Brown Inc. | Apparatus for differential pressure forming and trimming |
US5422064A (en) * | 1989-05-25 | 1995-06-06 | Toyo Tire & Rubber Co., Ltd. | Method for manufacturing a diaphragm for a gasmeter |
US5800846A (en) * | 1996-02-23 | 1998-09-01 | Trienda Corporation | Twin-sheet thermoforming apparatus with hydraulic array mold support |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1415018A (en) * | 1921-04-27 | 1922-05-09 | Fed Products Company | Die press |
US1880858A (en) * | 1927-09-22 | 1932-10-04 | Purity Fibre Products Corp | Method and apparatus for forming articles |
US2962758A (en) * | 1957-02-08 | 1960-12-06 | Illinois Tool Works | Method and apparatus for forming hollow plastic articles |
US3007201A (en) * | 1958-09-09 | 1961-11-07 | Hoechst Ag | Method and apparatus for a continuous production of plastic-foil articles in deep drawing |
US3115678A (en) * | 1960-10-07 | 1963-12-31 | Collins & Aikman Corp | Apparatus for molding plastic carpets |
US3166790A (en) * | 1961-12-18 | 1965-01-26 | Kirkhof Mfg Corp | Forming press |
US3180776A (en) * | 1961-01-28 | 1965-04-27 | Ornapress A G | Ornamentation of plastic articles |
US3189399A (en) * | 1961-10-13 | 1965-06-15 | Sun Chemical Corp | Forming machine and process |
-
1966
- 1966-08-22 US US573916A patent/US3376607A/en not_active Expired - Lifetime
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1415018A (en) * | 1921-04-27 | 1922-05-09 | Fed Products Company | Die press |
US1880858A (en) * | 1927-09-22 | 1932-10-04 | Purity Fibre Products Corp | Method and apparatus for forming articles |
US2962758A (en) * | 1957-02-08 | 1960-12-06 | Illinois Tool Works | Method and apparatus for forming hollow plastic articles |
US3007201A (en) * | 1958-09-09 | 1961-11-07 | Hoechst Ag | Method and apparatus for a continuous production of plastic-foil articles in deep drawing |
US3115678A (en) * | 1960-10-07 | 1963-12-31 | Collins & Aikman Corp | Apparatus for molding plastic carpets |
US3180776A (en) * | 1961-01-28 | 1965-04-27 | Ornapress A G | Ornamentation of plastic articles |
US3189399A (en) * | 1961-10-13 | 1965-06-15 | Sun Chemical Corp | Forming machine and process |
US3166790A (en) * | 1961-12-18 | 1965-01-26 | Kirkhof Mfg Corp | Forming press |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3504403A (en) * | 1967-03-20 | 1970-04-07 | Brown Machine Co Of Michigan | Differential pressure plastic forming machine partible mold mechanism for forming articles in a plastic sheet |
US3776681A (en) * | 1971-04-27 | 1973-12-04 | Standard Oil Co | Thermoforming apparatus |
US4130387A (en) * | 1974-03-05 | 1978-12-19 | National Can Corporation | Apparatus for thermoforming plastic articles |
US4162883A (en) * | 1974-03-05 | 1979-07-31 | National Can Corporation | Apparatus for thermoforming hollow article having a high L/D ratio |
US4273524A (en) * | 1978-10-18 | 1981-06-16 | Hull Corporation | Platen type molding press |
US4255382A (en) * | 1980-03-20 | 1981-03-10 | Leesona Corporation | Thermoforming machine with automatically mechanically operated web stripping element |
US4376744A (en) * | 1980-09-02 | 1983-03-15 | Ptx-Pentronix, Inc. | Mechanical and fluid actuated ram for powder compacting press and method of compacting powder material |
US4360335A (en) * | 1981-08-28 | 1982-11-23 | Sun Metal Products, Inc. | Molding press for semi-pneumatic tire bodies and the like |
US4685880A (en) * | 1985-06-18 | 1987-08-11 | American Hospital Supply Corporation | Cuvette belts and manufacture of same |
US5422064A (en) * | 1989-05-25 | 1995-06-06 | Toyo Tire & Rubber Co., Ltd. | Method for manufacturing a diaphragm for a gasmeter |
US5225213A (en) * | 1991-12-16 | 1993-07-06 | John Brown Inc. | Apparatus for differential pressure forming and trimming |
US5800846A (en) * | 1996-02-23 | 1998-09-01 | Trienda Corporation | Twin-sheet thermoforming apparatus with hydraulic array mold support |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: JOHN BROWN INDUSTRIES LTD.; 100 WEST TENTH ST., WI Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:LEESONA CORPORATION; 333 STRAWBERRY FIELD RD., WARWICK, RI. A CORP. OF MA.;REEL/FRAME:003936/0206 Effective date: 19810501 |
|
AS | Assignment |
Owner name: LEESONA CORPORATION Free format text: CHANGE OF NAME;ASSIGNOR:JOHN BROWN INDUSTRIES LTD.;REEL/FRAME:003936/0238 Effective date: 19810331 |
|
AS | Assignment |
Owner name: LEESONA CORPORATION, A CORP. OF MASS. Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KOEHRING COMPANY;REEL/FRAME:003954/0491 Effective date: 19751212 Owner name: LEESONA CORPORATION, A CORP. OF MASS., MASSACHUSET Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:KOEHRING COMPANY;REEL/FRAME:003954/0491 Effective date: 19751212 |