EP0017720B1 - Offset-Druckmaschine und Verfahren zum Umwandeln einer Druckmaschine für Hochdruck in eine Offset-Druckmaschine - Google Patents
Offset-Druckmaschine und Verfahren zum Umwandeln einer Druckmaschine für Hochdruck in eine Offset-Druckmaschine Download PDFInfo
- Publication number
- EP0017720B1 EP0017720B1 EP80100727A EP80100727A EP0017720B1 EP 0017720 B1 EP0017720 B1 EP 0017720B1 EP 80100727 A EP80100727 A EP 80100727A EP 80100727 A EP80100727 A EP 80100727A EP 0017720 B1 EP0017720 B1 EP 0017720B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- cylinders
- pair
- blanket
- cylinder
- plate
- 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
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F11/00—Rotary presses or machines having forme cylinders carrying a plurality of printing surfaces, or for performing letterpress, lithographic, or intaglio processes selectively or in combination
Definitions
- the present invention relates to an offset printing press unit and to a method for converting a web fed letterpress unit into a web fed off- iset printing press unit.
- the frames for the letterpress units are massive and reboring the frames in place for insertion of offset cylinders is impractical. Often reboring is impossible because the new bores would overlap the old bores. Moreover, completely replacing the equipment or completely reworking it is very time consuming.
- Press units convertible from one printing mode to another are known, from such prior disclosures, for example, as U.S. Patents 2,024,813 and 3,986,454.
- Such units are, in each instance, originally configured to embody this capability.
- the only known attempt to convert a press unit not originally structured for offset perfecting, direct lithographic or "di-litho" simply replaces the letterpress plate and impression cylinders with offset plate and blanket cylinders. In the di-litho process, the web is fed between the di-litho plate and blanket cylinders so that the process is not a true off-set printing process.
- a method for converting a web fed letterpress unit having a main frame, a pair of plate cylinders laterally spaced in the frame for mounting printing plates thereon, means for applying films of ink to the plates, and a pair of impression cylinders in respective rolling contact with the plates on the plate cylinder, into a web-fed off- set printing press unit includes removing the pair of letterpress plate cylinders and the pair of letterpress impression cylinders.
- An auxiliary frame for receiving offset cylinders in an offset printing press configuration is put inside the main frame. A pair of offset plate cylinders is then installed.
- the offset plate cylinders might fit into the bores and bearings for the letter- press plate cylinders in which case they can be installed directly, otherwise one or both of the offset plate cylinders is installed in the auxiliary frame.
- the auxiliary frame is then installed, using pilots to guide the installation of the auxiliary frame.
- the pilots in one embodiment, are affixed to the auxiliary frame and are designed to be inserted into the unused cylinder bores of the main frame.
- a pair of blanket cylinders is installed in close proximity to a position for respective rolling contact with the plates on the plate cylinder and the other blanket cylinder with at least one of the blanket cylinders supported on the auxiliary frame.
- a preferred conversion according to the present method includes removing the at least one pair of form rollers, and mounting micrometric adjusting sockets for receiving the form rollers for respective rolling contact between the at least one pair of form rollers with the plates of the plate cylinder after the pair of offset plate cylinders is installed. It is also preferred to substitute ink drums which are copper plated, and add dampener motions which can be added on one of the form rollers.
- the gear train used to drive the letterpress unit cylinders is not suitable for driving the offset cylinders.
- a new offset gear train must, therefore, be installed for imparting motion from one of the offset press unit cylinders to other offset press unit cylinders.
- Some of the gears for the letterpress unit can be removed, but many will still be used for driving at least one of the cylinders and for driving the inking drums.
- the offset gear train can normally be installed on the outside of the main frame to allow more room inside the frames for wider web widths. Otherwise, the offset gear train can be installed inside of the main frame.
- a preferred conversion according to the present method and apparatus includes the installation of means for bodily swinging various cylinders into different positions for different printing arrangements and for throw-off in case of web wrap, for changing plates, or other cylinder maintenance.
- a special method for converting a letterpress unit that has at least a half deck with a deck plate cylinder and a deck impression cylinder is to remove the deck impression cylinder, install a deck blanket cylinder in a position for rolling contact with the plates of the deck plate cylinder, if necessary, replacing the deck plate cylinder with a deck offset plate cylinder, and installing an impression cylinder in the vicinity of the cusp formed by the pair of blanket cylinders for placing in rolling contact with the deck blanket cylinder and for placing in rolling contact with all three cylinders, the deck blanket cylinder and the pair of offset blanket cylinders.
- This method also includes the situation where there is a full deck, the full deck being simply two half decks.
- a means is installed for bodily swinging each of the blanket cylinders and the impression cylinder between a first position in which the blanket cylinders make contact with the plates of their respective plate cylinders and with the impression cylinder, a second position in which the pair of blanket cylinders make contact with each other and are isolated from the impression cylinder, and the deck blanket cylinder makes contact with the impression cylinder, and a third position in which the blanket cylinders and the impression cylinder are displaced into a throw-off position in which the blanket cylinders are isolated from their associated cylinders.
- Such a method can also include installing a means for bodily swinging the remaining offset cylinders wherein all offset cylinders are displaced in the third position.
- a typical web fed letterpress unit referred to generally by reference numeral 10 prints on both sides of a web 11.
- Letterpress unit 10 includes a main frame 12, a pair of plate cylinders 14 and 14a laterally spaced in frame 12 for mounting printing plates thereon, means including ink transfer rollers and cylinders or drums 16 and 16a and form rollers 18, 18a, 20 and 20a for applying films of ink to the plates.
- Letterpress unit 10 also includes a pair of impression cylinders 22 and 22a in respective rolling contact with the plates on the plate cylinder 14 and 14a, respectively.
- the letterpress unit is driven by a horizontal shaft 24 which drives a vertical drive shaft 26 through bevel gears 28 and 30.
- Vertical drive shaft 26 in turn drives the letterpress cylinders through gear train 32 which includes a spur drive gear 34 for cylinder 14, a spur drive gear 36 for compression cylinder 22a and a spur gear-bevel gear combination 38 driven by vertical shaft 26 through bevel gear 40.
- gear train 32 which includes a spur drive gear 34 for cylinder 14, a spur drive gear 36 for compression cylinder 22a and a spur gear-bevel gear combination 38 driven by vertical shaft 26 through bevel gear 40.
- spur gears On the far end of frame 12 are mounted spur gears corresponding to each of the plate cylinders 14 and 14a and each of the impression cylinders 22 and 22a so that the gear for plate cylinder 14 drives the gear for impression cylinder 22, and the gear for impression cylinder 22a drives the gear for plate cylinder 1 4a.
- a web fed offset printing press unit converted from web fed letterpress unit 10 of Figures 1 and 2 is referred to generally by reference numeral 42. It includes main frame 12, ink transfer rollers and drums 16 and 1 6a, and form rollers 18, 18a, 20 and 20a. It also includes the same driving mechanism through vertical shaft 26, bevel gear 40, combination spur gear-bevel gear 38 and spur gear 34. Offset press unit 42, however, also has an auxiliary frame 44 inside main frame 12 for receiving cylinders.
- a pair of offset plate cylinders 46 and 46a are laterally spaced inside the frames for mounting printing plates thereon, and a pair of blanket cylinders 48 and 48a are inside the frames in close proximity to a position for respective rolling contact with the plates on the plate cylinder, cylinder 46 or 46a, and the other blanket cylinder.
- cylinder 46 to include a drum 50 and a shaft 52, it can be seen that the shaft for some cylinders extends beyond auxiliary frame 44 and even beyond main frame 12. The cylinders are thus "inside the frames" in the sense that they are primarily inside the frames.
- Web fed offset printing press unit 42 also includes a gear train 54 inside main frame 12 for imparting motion from one of the cylinders, cylinder 46 in this case, to other cylinders, in this case cylinders 48, 48a and 46a. It was necessary to shorten drums 50 of the cylinders in order to allow more room within main frame 12 for both auxiliary frame 44 and gear train 54. Gear train 54 could not be moved outside of main frame 12 since the shafts 52 of cylinders 48 and 48a do not align with bores 56, 56a, 58 and 58a for the letterpress unit cylinders even with the bearings removed from those bores.
- a method for converting web fed letterpress unit 10 of Figures 1 and 2 into web fed offset printing press unit 42 of Figures 3 and 4 comprises in combination the steps of removing the pair of letterpress plate cylinders 14 and 14a and the pair of letterpressure impression cylinders 22 and 22a, putting inside main frame 12 a lower portion of an auxiliary frame 44 for receiving offset cylinders in an offset printing press configuration, installing a pair of offset plate cylinders 46 and 46a, installing the lower portion of auxiliary frame 44, and installing a pair of blanket cylinders 48 and 48a in close proximity to a position for respective rolling contact with the plates on plate cylinder 46 and 46a respectively and the other blanket cylinder.
- auxiliary frame 44 also includes a pilot, in this case four pilots 60, 60a, 62, and 62a, for insertion into a bore, bores 56, 56a, 58 and 58a respectively, for one of the letterpress cylinders can also include positioning auxiliary frame 44 on the inside of main frame 12 after the pair of letterpress plate cylinders 14 and 14a and pair of letterpress impression cylinders 22 and 22a have been removed to make the pilot align with the associated bore, and then moving auxiliaiy frame 44 to insert the pilot into the bore.
- a pilot in this case four pilots 60, 60a, 62, and 62a
- a preferred method includes removing at least one pair of form rollers, either 18 and 18a or 20 and 20a or both pairs, mounting micrometric adjusting sockets for receiving the form rollers for respective rolling contact by the form rollers with the plates of plate cylinders 46 and 46a after the pair of offset plate cylinders is installed, and then installing the at least one pair of form rollers. It is also preferred that the ink drums of 16 and 16a be plated with copper, and that dampener motions 64 and 64a be added to one of the form rollers. Gear train 54 is also added. Gears 66 and 66a are added to plate cylinders 46 and 46a respectively for driving the inking rollers and drums. Means 68 for bodily swinging each of blanket cylinders 48 and 48a is installed.
- Means 68 is for bodily swinging the cylinders between a first position in which the blanket cylinders make contact with their respective plate cylinders and with each other for applying an inked image on opposite sides of a web fed between them, and a second position in which the blanket cylinders are displaced into a throw-off position in which the blanket cylinders are isolated from their associated cylinders.
- Means 68 can be manually or hydraulically turned eccentric bearings. Such mechanisms are common in printing presses and are described in detail in US-A-3,329,086.
- Means 68 are also installed for bodily swinging each of the plate cylinders, and the positions mentioned can be accomplished by bodily swinging both plate cylinders and blanket cylinders.
- an offset press unit converted from a different letterpress unit is referred to generally by reference numeral 70, but elements similar to those in offset press unit 42 are numbered the same as in Figures 3 and 4.
- An extension 71 of shaft 52 is added for cylinder 46 by means of coupler 72.
- An additional means 68 for bodily swinging plate cylinder 46 is added along with an additional bearing 74 in order to support both ends of shaft 52 and extension 71, thus structurally relieving coupler 72. Since the shaft of plate cylinder 46a no longer aligns with the letterpress plate cylinder bore 76, a gear train 78 is used to impart motion from blanket cylinder 48a to shaft 80 which extends through bore 76 and is supported by bearings 82 and 84.
- Extra means 68 for bodily swinging plate cylinder 46a are installed in auxiliary frame 44 since the journal for the shaft of plate cylinder 46a must now be in the auxiliary frame rather than in main frame 12.
- Three-color letterpress unit 86 includes a half deck 88 which includes deck plate cylinder 90 and deck impression cylinder 92.
- a method according to the present invention for converting to an offset press unit 94 includes removing the letterpress cylinders and adding offset press cylinders as before, including replacing impression cylinder 92 with deck blanket cylinder 96 and replacing deck letterpress plate cylinder 90 with deck offset plate cylinder 98.
- the method further includes installing an offset impression cylinder 100 along with the necessary auxiliary frame to support it, impression cylinder 100 being chosen of the proper size to be in rolling contact with blanket cylinders 48, 48a, and 96. If it is desired to dedicate three-color offset press unit 94 as a three-color unit, then no further changes are necessary, but a preferred method according to the present invention includes conversion of letterpress unit 86 into an offset press 94 which can be used for three color or spot color, where "spot color” refers to adding a single color to one side of a web that is printed on both sides.
- blanket cylinders 48 and 48a print on both sides of web 11 in what is known as “blanket-to-blanket” printing while blanket cylinder 96 is used to add an additional color to one side of web 11 in “blanket-to- impression” printing.
- a means for bodily swinging each of the blanket cylinders and the impression cylinder which can include a means for bodily swinging the remaining offset cylinders, between a first position in which blanket cylinders 48, 48a and 96 make contact with the plates of their respective plate cylinders 46, 46a and 98, and with impression cylinder 100, a second position in which the pair of blanket cylinders 48 and 48a make contact with each other and are isolated from impression cylinder 100, and deck blanket cylinder 96 makes contact with impression cylinder 100, and a third position in which blanket cylinders 48, 48a and 96, and impression cylinder 100 are displaced into a throw-off position in which the blanket cylinders are isolated from their associated cylinders. All offset cylinders could be displaced into the third position.
- One simple means for carrying out such an arrangement between the first two positions is to include means for bodily swinging blanket . cylinders 48 and 48a and lifting the entire half deck 88 along with impression
- a four-color letter- press unit is referred to generally by reference numeral 102.
- Four-color letterpress unit 102 prints four colors on one side of web 11, one color being added by each plate cylinder 14, 14a, 104 and 104a.
- Plate cylinders 104 and 104a are referred to as "humps”.
- Hump plate cylinders 104 and 104a are on half decks.
- a method according to the present invention includes removing plate cylinders 104 and 104a from their respective half decks and replacing them by offset plate cylinders 106 and 106a respectively in conjunction with blanket cylinders 108 and 108a respectively.
- offset impression cylinder 110 is added between the four blanket cylinders for placing in rolling contact with the blanket cylinders.
- an alternative embodiment of an offset press converted from a letterpress is referred to generally by reference numeral 110.
- Shaft 52 of plate cylinder 46 aligns with bore 112, but means 68 for bodily swinging plate cylinder 46 is moved into auxiliary frame 44 although it could have remained in bore 112.
- a gear train 114 is placed outside main frame 12 for imparting motion from one of the cylinders, plate cylinder 46, to other cylinders, in this case blanket cylinders 48 and 48a and plate cylinder 46a.
- the shafts of the cylinders extend through bores 56, 56a, 76 and 112 for the letterpress unit cylinders in main frame 12 and through the associated bearings, in this case means 68, to the outside of main frame 12.
- the gears of gear train 114 are fixed to shafts 52 of the cylinders. This arrangement was possible because for this particular conversion, the shafts of the offset press cylinders aligned with the bores of the letterpress cylinder.
- the bearings from the main frame bores were removed for the offset press configuration cylinder shafts which do not align with the. bearings. In this case, the bearings for cylinder 46 were removed from the main frame even though they aligned.
- This method includes the situation in which some gears can be put outside main frame 12 but others must be put inside main frame 12 in order to get different print configurations.
- auxiliary frame 44 Only a lower portion of auxiliary frame 44 has been discussed, and in some situations this may be the entire auxiliary frame. Referring again to Figure 3, another embodiment of a lower portion of auxiliary frame 44 will leave the bores for the cylinders exposed so that the offset cylinders can simply be dropped into place. The location of the top of such a lower portion is illustrated by line 116. A cap is then attached to hold the cylinders and their respective bearings in place. This is similar to the common practice of capping main frames.
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Rotary Presses (AREA)
Claims (19)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT80100727T ATE4878T1 (de) | 1979-04-20 | 1980-02-13 | Offset-druckmaschine und verfahren zum umwandeln einer druckmaschine fuer hochdruck in eine offset- druckmaschine. |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US3224079A | 1979-04-20 | 1979-04-20 | |
US32240 | 1979-04-20 | ||
AU64040/80A AU6404080A (en) | 1979-04-20 | 1980-11-03 | Conversion of letterpress to offset |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0017720A1 EP0017720A1 (de) | 1980-10-29 |
EP0017720B1 true EP0017720B1 (de) | 1983-10-05 |
Family
ID=25634201
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP80100727A Expired EP0017720B1 (de) | 1979-04-20 | 1980-02-13 | Offset-Druckmaschine und Verfahren zum Umwandeln einer Druckmaschine für Hochdruck in eine Offset-Druckmaschine |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0017720B1 (de) |
JP (1) | JPS55148161A (de) |
AU (1) | AU6404080A (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19513536A1 (de) * | 1995-04-10 | 1996-10-17 | Heidelberger Druckmasch Ag | Druckmaschine mit mehreren Druckwerken |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AU542907B2 (en) * | 1980-02-20 | 1985-03-21 | Publishers Equipment Corp. | Conversion of letterpress to offset printing |
DE3045164A1 (de) * | 1980-12-01 | 1982-07-01 | M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach | "ausbaufaehige bogenoffset-rotationsdruckmaschine" |
DE3407428C1 (de) * | 1984-02-29 | 1985-10-17 | M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach | Anordnung zum Antrieb einer Walze oder eines Zylinders einer von Buchdruck auf Flexodruck umruestbaren Rotationsdruckmaschine |
US4729307A (en) * | 1986-02-19 | 1988-03-08 | Odis E. Harrison | Form roller attachment for lithographic press |
Family Cites Families (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE544298C (de) * | 1931-05-31 | 1932-02-16 | Goebel Akt Ges | Aus mehreren hintereinander angeordneten Rotationsgummidruckwerken bestehende Maschine zum mehrfarbigen Bedrucken einer Werkstoffbahn |
FR789782A (fr) * | 1934-08-08 | 1935-11-06 | Machine rotative multiple | |
US2024813A (en) * | 1934-11-28 | 1935-12-17 | Cottrell C B & Sons Co | Convertible web printing press |
FR902947A (fr) * | 1943-10-25 | 1945-09-17 | Mongolfier Fils & Cie | Perfectionnements dans les presses à imprimer |
FR1257552A (fr) * | 1960-05-25 | 1961-03-31 | Machine à imprimer rotative | |
FR1433578A (fr) * | 1965-02-19 | 1966-04-01 | Creusot Forges Ateliers | Machine d'imprimerie susceptible de fonctionner en machine offset ou en machine typographique |
FR1435026A (fr) * | 1965-02-19 | 1966-04-15 | Creusot Forges Ateliers | Machine d'imprimerie susceptible de fonctionner en machine offset, offset sec, typo transfert ou en machine typographique |
DE1247339B (de) * | 1965-12-17 | 1967-08-17 | Maschf Augsburg Nuernberg Ag | Rotationsdruckmaschine fuer direkten und indirekten Druck in Fuenfzylinderbauart |
US3329086A (en) * | 1966-06-14 | 1967-07-04 | Miehle Goss Dexter Inc | Perfecting or multicolor offset printing press |
US3986454A (en) * | 1973-07-09 | 1976-10-19 | Granger Wallace H | Multi-purpose side frames for rotary printing press |
-
1980
- 1980-02-13 EP EP80100727A patent/EP0017720B1/de not_active Expired
- 1980-04-18 JP JP5055780A patent/JPS55148161A/ja active Pending
- 1980-11-03 AU AU64040/80A patent/AU6404080A/en not_active Abandoned
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19513536A1 (de) * | 1995-04-10 | 1996-10-17 | Heidelberger Druckmasch Ag | Druckmaschine mit mehreren Druckwerken |
Also Published As
Publication number | Publication date |
---|---|
AU6404080A (en) | 1982-05-13 |
JPS55148161A (en) | 1980-11-18 |
EP0017720A1 (de) | 1980-10-29 |
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