GB2258191A - Plant for printing,drying, cooling, cutting and folding parallel webs. - Google Patents
Plant for printing,drying, cooling, cutting and folding parallel webs. Download PDFInfo
- Publication number
- GB2258191A GB2258191A GB9117553A GB9117553A GB2258191A GB 2258191 A GB2258191 A GB 2258191A GB 9117553 A GB9117553 A GB 9117553A GB 9117553 A GB9117553 A GB 9117553A GB 2258191 A GB2258191 A GB 2258191A
- Authority
- GB
- United Kingdom
- Prior art keywords
- webs
- web
- printing
- folded
- sheets
- 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.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
- B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
- B41F23/0403—Drying webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F23/00—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing
- B41F23/04—Devices for treating the surfaces of sheets, webs, or other articles in connection with printing by heat drying, by cooling, by applying powders
- B41F23/0483—Drying combined with cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F7/00—Rotary lithographic machines
- B41F7/02—Rotary lithographic machines for offset printing
- B41F7/12—Rotary lithographic machines for offset printing using two cylinders one of which serves two functions, e.g. as a transfer and impression cylinder in perfecting machines
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/38—Delivering or advancing articles from machines; Advancing articles to or into piles by movable piling or advancing arms, frames, plates, or like members with which the articles are maintained in face contact
- B65H29/40—Members rotated about an axis perpendicular to direction of article movement, e.g. star-wheels formed by S-shaped members
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Folding Of Thin Sheet-Like Materials, Special Discharging Devices, And Others (AREA)
Abstract
Paper webs (2, 3, 4, 5) are simultaneously printed on both sides in respective printing units (not shown in Fig. 2). Print on the webs (2, 3, 4, 5) is dried by passing the webs (2, 3, 4, 5) in pairs through drying ovens (12). Downstream of the drying ovens (12) the webs (2, 3, 4, 5) pass over cooling rollers (15) and guide rollers (20) which are adjustable to control the orientation of the webs (2, 3, 4, 5) as they are fed into a folding unit (25). Within the folding unit (25) the webs (2, 3, 4, 5) are cut into sheets and folded. Folded sheets discharged from the folding unit (25) are delivered to a turning device (27) which turns over the folded sheets and drops the folded sheets onto a conveyor (28) such that a folded edge of each folded sheet faces in the direction of travel of the conveyor (28). Descriptions of a damping fluid train, an adjustable web guide and a turning device are given. <IMAGE>
Description
"Improved printing process and apparatus This invention relates to a rotary offset printing process and apparatus.
It is known to provide a rotary offset printing process and printing press apparatus in which a number of paper webs are led from storage reels through printing machines, one for each web, which print on the webs. From the printing machines each web is led to a separate drying oven associated with each printing machine to dry the print on the web. Downstream of the drying ovens each web is passed over cooling rollers to cool the web prior to feeding the web into a folding machine which cuts the web into sheets, folds the sheets and discharges the folded sheets onto a conveyer for delivery for further processing such as binding for example.
A number of problems can arise in operating the process. The webs have to be accurately fed through the printing press to ensure efficient continuous running of the press. Any misalignment can ruin a printing run with time lost in correcting the fault and in printing new web material.
Correct feeding of the printed webs into the folding machine is also essential otherwise the web will be incorrectly cut and folded, leading to rejection of the folded sheets, with further downtime sent in correcting the fault and printing replacements.
The initial setting up of the printing press is therefore a difficult and time consuming process requiring some considerable skill on the part of the operator.
The present invention is directed towards providing an improved printing process and printing press apparatus which overcomes these problems.
According to the invention, there is provided a rotary offset printing process comprising the steps;
(a) leading a pair of webs from rotatable web storage
reels to associated printing units,
(b) simultaneously printing on both sides of each web
at the printing units, each web being passed between
a pair of rotating blanket rollers which apply print
to the webs.
(c) guiding the webs to a drying oven,
(d) passing both webs through the drying oven together
in a controlled manner to dry the print, the webs
being spaced-apart one above the other,
(e) guiding the webs from the oven to cooling rollers
and passing the webs over the cooling rollers,
(f) delivering the webs to a folding unit in which the
steps of cutting the web into sheets and folding
each sheet are carried out, the folded sheets being
discharged onto a conveyer which delivers the folded
sheets to a further processing station.
In a preferred embodiment of the invention the process includes the step of passing the webs over guide rollers located between the cooling rollers and the folding unit, and adjusting the guide rollers if required to control the orientation of webs fed into the folding unit to correctly feed the webs into the folding unit.
In another embodiment the process includes the step of controlling the orientation of folded sheets discharged from the folding unit such that a folded edge of each sheet is faced in the direction of travel of the folded sheet.
In another aspect, the invention provides a rotary offset printing press apparatus comprising in an in-line arrangement, a pair of rotatable web storaae reel supports, a pair of printing units, each printing unit for simultaneously printing on both sides of a web fed from a web storage reel through the printing unit, a drying oven for reception and through passage of both webs simultaneously spaced-apart one above the other, to dry print on the webs, cooling rollers over which the webs are passed to cool the webs, guide rollers over which each web is passed, the guide rollers pivotally adjustable to adjust the orientation of a web passed over the guide rollers for correct feed of the web to a folding machine which cuts the web into sheets, folds the sheets and discharges the folded sheets onto a conveyer.
In a preferred embodiment, the guide rollers comprise a pair of parallel rollers rotatably mounted spaced-apart between roller end supports, the roller end supports being mounted on a support frame, one of the roller end supports being pivotally mounted on the support frame, the other free roller end support slidably mounted in a channel on the support frame, a motor driven screw mechanism extending between the support frame and the free roller end support for slidably moving the free roller end support along the channel.
In a further embodiment, a folded sheet turning device is provided below an outlet end of the conveyer, the turning device comprising a rotatable cylinder having a number of spaced-apart outwardly extending spiral arms, adjacent arms defining a slot for reception of a folded sheet.
The invention will be more clearly understood by the following description of an embodiment thereof given by way of example only with reference to the accompanying drawings, in which;
Fig 1. is a diagrammatic side view of portion of a
printing press according to the invention showing a
number of printing units,
Fig. 2 is a diagrammatic side elevational view of portion
of the printing press,
Fig. 3 is a diagrammatic side view of a printing unit
forming portion of the printing press,
Fig. 4 is a detailed perspective view of portion of the
printing unit,
Figs. 5 and 6 are detailed views of portions of the
printing unit,
Fig. 7 is a detailed elevational view of adjustable guide
rollers forming portion of the printing press,
Fig. 8 is a plan view of the guide rollers,
Fig. 9 is a perspective view of a folded sheet turning
device forming portion of the printing press, and
Fig. 10 is a side view of the turning unit.
Referring to the drawings there is illustrated a rotary offset printing press apparatus, indicated generally by the reference numeral 1 used for carrying out the process according to the invention. The printing press 1 comprises two in-line units for simultaneously printing four webs 2, 3, 4, 5 of paper.
Each web 2, 3, 4, 5 is supplied from a rotatable web storage reel (not shown) and led to an associated printing unit 10.
Within each printing unit 10 the webs 2, 3, 4, 5 are simultaneously printed on both sides and upon discharge from the printing units the webs 2, 3, 4, 5 are guided to drying ovens 12. It will be noted that the webs 2, 3, 4, 5 are delivered through the drying ovens 12 in pairs, each pair of webs 2, 3 and 4, 5 passing through one of the ovens 12 together, spaced-apart one above the other to dry the print on the webs 2, 3 and 4, 5. Downstream of the drying ovens each pair of webs 2, 3 and 4, 5 are brought together and led over cooling rollers 15. Downstream of the cooling rollers 15 the webs 2, 3 and 4, 5 are separated and led over guide rollers 20 which are adjustable to control the orientation of the webs 2, 3, 4, 5. Then the webs 2, 3, 4, 5 are fed into a folding unit 25 in which the webs are cut into sheets which are subsequently folded.Folded sheets discharged from the folding unit 25 are delivered to a turning device 27 which turns over the folded sheets and drops the folded sheets onto a conveyer 28 such that a folded edge of each folded sheet faces in the direction of travel on the conveyer 28.
Referring now in particular to Figs. 3 to 6 a printing unit 10 will. be described. Each printing unit 10 has a pair of rotatable blanket cylinders 30 between which a web 2 is passed to simultaneously print on both sides of the web 2. Print is applied to each blanket roller 30 by an associated plate cylinder 31 in conventional manner. Damping fluid is applied to the plate cylinder 31 by a number of rollers 32 - 35 extending between a trough 36 forming a fluid reservoir and the plate cylinder 31. The rollers comprise a fountain roller 32 the surface of which extends into the trough 36. A brush roller 33 contacts the fountain roller 32 and transfers fluid picked up by the fountain roller 32 to an intermediate steel roller 34. The roller 34 transfers the fluid via a rubber roller 35 to the plate cylinder 31. Neans is provided to deliver fluid from a sump 37 to each trough 36. Fluid in each trough 36 is maintained at a preset level such that the fountain roller 32 is always partially immersed.
Referring now in particular to Figs. 7 and 8 the arrangement of the guide rollers 20 will be described. A pair of guide rollers 20 are rotatably mounted between end supports 40, 41.
One end support 41 is pivotally mounted at 42 on a support frame 43. The other free end support 40 is slidably mounted for horizontal movement within a channel 44 mounted on the support frame 43. A motor 46 on the support frame 43 connects through a screw mechanism 47 with the free end support 40.
Operation of the motor 46 drives the screw mechanism 47 to slide the free end 40 along the channel 44 thus altering the orientation of the rollers 20 relative to the support frame 43. By adjustment of the guide rollers 20 a web 2 passing over the guide rollers 20 can be adjusted for correct entry into the folding machine 25 ensuring correct positioning of the web 2 within the folding machine 25 for folding.
Advantageously, the guide rollers 20 can be adjusted while the printing press 1 is running.
Referring now in particular to Figs. 9 and 10, the turning device 27 will be described. A discharge conveyer 50 discharges folded sheets 51 from the folding machine 25. It will be noted that the folding unit 25 discharges folded sheets 51 with an open edge 52 of the folded sheet 51 facing in the direction of travel of the folded sheets 51. Upon delivery to the turning device 27 the folded sheets 51 are turned over so that a closed edge 53 of each folded sheet 51 is facing in the direction of travel of the folded sheets 51 on the conveyer 28. The turning device 27 has a cylindrical body 55 and is rotatably supported beneath the discharge conveyer 50. A number of spiral arms 56 extend outwardly of a surface of the body 55 curving outwardly of the body 55. A slot 57 for reception of a folded sheet 51 is formed between each adjacent pair of arms 56.As the body 55 is rotated in the direction of arrow A (Fig. 10) folded sheets 51 from the discharge conveyer 50 are dropped into each slot 57 open end 52 first. When the body 55 rotates through approximately 1800 the folded sheets 51 drop back out of the slots 57 onto the conveyer 28 in the required orientation.
It will be appreciated that the use of a single oven for a pair of webs has a number of advantages. It was previously believed that it would not be possible to adequately dry a pair of webs in a single oven and normally a single oven is provided for each web. However, it has been found that by carefully controlling the heat input in each oven, the relative spacing of the webs and the speed the webs travel through the oven, a pair of webs can in fact surprisingly be adequately dried in each oven without adversely affecting the print quality. Thus, advantageously there is large capital cost saving in that only one oven need be provided where previously it was thought that two ovens where required. A further advantage is the improved efficiency and energy saving.Also as less fuel is being burnt to heat the drying air for the oven, pollution due to exhaust gases is also advantageously reduced.
The guide rollers at the entry to the folding machine advantageously ensure correct alignment of a web entering the folding machine. The guide rollers are adjustable when running and thus advantageously accurate positioning of the web can be achieved and the printing press can be quickly and easily set-up and adjusted for optimum running conditions.
Advantageously, there is less downtime and wastage due to the incorrect feeding of a web into the folding machine.
The provision of the turning device at an outlet of the folding machine advantageously aligns folded sheets with their folded edge facing in the direction of travel. This ensures a smoother delivery of the folded sheets along conveyers for further processing.
The invention is not limited to the embodiment hereinbefore described which may be varied in both construction and detail.
Claims (6)
1. A rotary offset printing process comprising the steps;
(a) leading a pair of webs from rotatable web
storage reels to associated printing units,
(b) simultaneously printing on both sides of each
web at the printing units, each web being
passed between a pair of rotating blanket
rollers which apply print to the web,
(c) guiding the webs to a drying oven,
(d) passing both webs through the drying oven
together in a controlled manner to dry the
print, the webs being spaced-apart one above
the other,
(e) guiding the webs from the oven to cooling
rollers and passing the webs over the cooling
rollers,
(f) delivering the webs to a folding unit, in which
the steps of cutting the web into sheets and
folding each sheet are carried out, the folded
sheets being discharged onto a conveyer for
delivery to a further processing station.
2. A process as claimed in claim 1 including the step of
passing the webs over guide rollers located between the
cooling rollers and the folding unit, and adjusting the
guide rollers if required to control the orientation of
webs fed into the folding unit to correctly feed the webs
into the folding unit.
3. A process as claimed in 1 or claim 2 including the step
of adjusting the orientation of folded sheets discharged
from the folding unit such that a folded edge of each
sheet is faced in the direction of travel of the folded
sheet.
4. A rotary offset printing press apparatus for carrying out
the process as claimed in any preceding claim, comprising
in an in-line arrangement, a pair of rotatable web
storage reel supports, a pair of printing units, sach printing unit for simultaneously printing on both sides
of a web fed from a web storage reel through the printing
unit, a drying oven for reception of both webs
simultaneously to dry print on the webs, cooling rollers
over which the webs can be passed to cool the webs, guide
rollers over which each web is passed, the guide rollers
pivotally adjustable to adjust the orientation of a web
passed over the guide rollers for correct feed of the web
to a folding machine which cuts the web into sheets,
folds the sheets and discharges the folded sheets onto a
conveyer.
5. An apparatus as claimed in claim 4 wherein, the guide
rollers comprise a pair of parallel rollers mounted
spaced-apart between roller end supports, the roller end
supports being mounted on a support frame, one of the
roller end supports being pivotally mounted on the
support frame, the other free roller end support slidably
mounted in a channel on the support frame, a motor driven
screw mechanism extending between the support frame and
the free roller end support for slidably moving the free
roller end along the channel.
6. An apparatus as claimed in claim 4 or 5 wherein a folded
sheet turning device is provided below an outlet end of
the conveyer, the turning device comprising a rotatable
cylinder having a number of spaced-apart outwardly
extending spiral arms, adjacent arms defining a slot for
reception of a folded sheet.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IE267391A IE65402B1 (en) | 1991-07-30 | 1991-07-30 | Improved printing process and apparatus |
Publications (3)
Publication Number | Publication Date |
---|---|
GB9117553D0 GB9117553D0 (en) | 1991-10-02 |
GB2258191A true GB2258191A (en) | 1993-02-03 |
GB2258191B GB2258191B (en) | 1994-11-30 |
Family
ID=11035971
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9117553A Expired - Fee Related GB2258191B (en) | 1991-07-30 | 1991-08-14 | Improved printing process and apparatus |
Country Status (3)
Country | Link |
---|---|
BE (1) | BE1003176A6 (en) |
GB (1) | GB2258191B (en) |
IE (1) | IE65402B1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5765294A (en) * | 1995-12-12 | 1998-06-16 | Koenig & Bauer-Albert Aktiengesellschaft | Method and apparatus for feeding and drying a printed paper web |
DE19621166C2 (en) * | 1996-05-24 | 2001-02-22 | Karlsruhe Forschzent | Magnetostrictive multilayer |
JP2005193437A (en) * | 2004-01-05 | 2005-07-21 | Miyakoshi Printing Machinery Co Ltd | Multi-web type rotary press |
CN1305675C (en) * | 2003-09-10 | 2007-03-21 | 株式会社宫腰 | Printing processing machine with length variable image |
US7417752B2 (en) * | 2001-07-02 | 2008-08-26 | Pitney Bowes Inc. | Method and system for customized mail piece production utilizing a data center |
EP1500502B1 (en) * | 2003-07-24 | 2010-08-11 | Miyakoshi Printing Machinery Co., Ltd. | Rotary press |
US7810921B2 (en) * | 2006-01-26 | 2010-10-12 | Miyakoshi Printing Machinery Co., Ltd. | Printing apparatus |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB919719A (en) * | 1960-07-18 | 1963-02-27 | Timsons Ltd | An improved arrangement of printing apparatus |
-
1991
- 1991-07-30 IE IE267391A patent/IE65402B1/en not_active IP Right Cessation
- 1991-08-14 GB GB9117553A patent/GB2258191B/en not_active Expired - Fee Related
- 1991-08-28 BE BE9100797A patent/BE1003176A6/en not_active IP Right Cessation
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB919719A (en) * | 1960-07-18 | 1963-02-27 | Timsons Ltd | An improved arrangement of printing apparatus |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5765294A (en) * | 1995-12-12 | 1998-06-16 | Koenig & Bauer-Albert Aktiengesellschaft | Method and apparatus for feeding and drying a printed paper web |
DE19621166C2 (en) * | 1996-05-24 | 2001-02-22 | Karlsruhe Forschzent | Magnetostrictive multilayer |
US7417752B2 (en) * | 2001-07-02 | 2008-08-26 | Pitney Bowes Inc. | Method and system for customized mail piece production utilizing a data center |
EP1500502B1 (en) * | 2003-07-24 | 2010-08-11 | Miyakoshi Printing Machinery Co., Ltd. | Rotary press |
CN1305675C (en) * | 2003-09-10 | 2007-03-21 | 株式会社宫腰 | Printing processing machine with length variable image |
JP2005193437A (en) * | 2004-01-05 | 2005-07-21 | Miyakoshi Printing Machinery Co Ltd | Multi-web type rotary press |
JP4659363B2 (en) * | 2004-01-05 | 2011-03-30 | 株式会社ミヤコシ | Multi-web type rotary press |
US7810921B2 (en) * | 2006-01-26 | 2010-10-12 | Miyakoshi Printing Machinery Co., Ltd. | Printing apparatus |
Also Published As
Publication number | Publication date |
---|---|
BE1003176A6 (en) | 1991-12-17 |
IE912673A1 (en) | 1993-02-10 |
GB2258191B (en) | 1994-11-30 |
IE65402B1 (en) | 1995-10-18 |
GB9117553D0 (en) | 1991-10-02 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 20020814 |