GB2191175A - Improvements in and relating to printing apparatus - Google Patents
Improvements in and relating to printing apparatus Download PDFInfo
- Publication number
- GB2191175A GB2191175A GB08613865A GB8613865A GB2191175A GB 2191175 A GB2191175 A GB 2191175A GB 08613865 A GB08613865 A GB 08613865A GB 8613865 A GB8613865 A GB 8613865A GB 2191175 A GB2191175 A GB 2191175A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gripper means
- shielding plate
- sheet
- fins
- gripper
- 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.)
- Withdrawn
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F21/00—Devices for conveying sheets through printing apparatus or machines
- B41F21/08—Combinations of endless conveyors and grippers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F21/00—Devices for conveying sheets through printing apparatus or machines
- B41F21/04—Grippers
-
- 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
- B41F23/044—Drying sheets, e.g. between two printing stations
- B41F23/0443—Drying sheets, e.g. between two printing stations after printing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
Description
1
GB 2 191 175 A
1
SPECIFICATION
Improvements in and relating to printing apparatus
5 The present invention relates to improvements in and relating to printing apparatus, especially sheet printing apparatus.
Conventional sheet printing apparatus, such as for example the offset litho printing apparatus supplied 10 by M.A.N. Roland Druckmaschinen AG of Offenbach and Augsburg, Federal Republicof Germany under the designation Roland 804, are generally provided I with a sheet supply unit forfeeding a supply of sheet to the printing station of the apparatus, a printing 15 station at which ink is printed onto the sheets, and a sheet transfer means for conveying printed sheets from the printing station to a sheet receiving unit which receives and generally also stacks, the printed sheets. Apparatus having more than one printing 20 station, such as the Roland 804 apparatus mentioned above which has two printing stations, is provided with further sheet transfer meansfor conveying the sheets from one printing station to the next.
Where the sheet printing apparatus is arranged to 25 print a radiation-cu rable ink onto the sheets at one or more of the printing stations, the apparatus may also be provided with radiation curing means arranged to direct ink-curing radiation onto the printed sheets conveyed by a subsequent sheet transfer means. 30 Apparatus of this type is disclosed in for example out co-pending European Patent Application No. 86301507.9 (publication number EP-A- ).
In conventional sheet printing apparatus, thesheet transfer means comprises a drive means engaging a 35 sheet gripper means (frequently termed a gripper barorwagon) which itself engages the leading edge of the printed sheet and thereby serves to pull the printed sheet along. However, where the apparatus is provided with a radiation curing means, the 40 gripper means as well as the printed sheet is exposed to the curing radiation. This results in a limitation being placed on the operating speed or daily operation period for such apparatus as a result of the heating effect of the curing radiation on the 45 gripper means since machine damage will occur if components such as the gripper means overheat or remain overheated for a prolonged period.
While the heating effect on the gripper means may ; be reduced to a certain extent by polishing the
50 surface of the gripper means that is exposed to the curing radiation, we have nowfoundthat overheating may be particularly effectively reduced or avoided by providing a reflection plate over, but spaced apart from, that surface. The reflecting plate 55 reduces the direct exposure of the gripper means to the curing radiation, reflects away much of the radiation striking it and, by being spaced apart from the main body ofthe gripper means, may be particularly effectively cooled by the airflow over its 60 surfaces during its travel in the printing apparatus.
In one aspect therefore, the present invention provides a sheet printing apparatus having at least one printing station for sheet printing, sheettransfer meansfor conveying printed sheets, and radiation 65 curing means arranged to direct curing radiation onto sheets conveyed by said sheettransfer means, said sheettransfer means comprising a sheet gripper means whose length extends transversely across the sheet feed direction ofthe sheettransfer 70 means, wherein said gripper means has attached thereto and spaced therefrom a shielding plate extending along at least part ofthe length of said gripping means, said shielding plate having as the surface remote from the gripper means a radiation 75 reflectingpolishedsurfacewhichservestoshadow said gripper means from directed radiation from said radiation curing means.
Viewed from another aspect, the invention also provides elongate sheet gripper means for a sheet 80 printing apparatus having extending thereover and spaced apart therefrom a shielding plate the outer surface whereof is reflective.
Itshould be noted that the term "ink" is used herein to designate other printable fluids, such as 85 varnishes, release coatings etc., besides conventional inks.
In orderto achieve a particularly effective cooling ofthe shielding plate, the inner surface ofthe plate, i.e. the surface facing the main body of the gripper 90 means, is preferably provided with fins orvanesto increase the surface area and to increase the heat loss to the air flowing past the plate during the motion ofthe gripper means. Such fins or vanes will preferably extend generally transversely to the 95 gripper means, i.e. generally along the direction of motion ofthe shielding plate. However, in a particularly preferred embodiment, the fins or vanes may be angled to the direction of motion in orderto direct the airflow, which is heated bycontactwith 100 theshielding plate, towards the sides ofthe printing apparatus where it may more readily be pumped away. In this way, avoidance of over-heating of apparatus components is particularly assisted.
If theshielding plateandthemain body ofthe 105 gripper means to which it is attached are fabricated from different materials, as may well be the case since the material ofthe shielding plate is preferably selected to achieve optimum reflectance, then the mounting forthe plate will generally be arranged to 110 permit the different longitudinal expansions ofthe plate and the gripper means to take place without undue distortion or strain occurring. Thus, for example, where the main body of the gripper means isfabricated from aluminium and the shielding plate 115 isfabricated from stainless steel, the plate is conveniently attached only at its mid-portion with its ends extending in a somewhat wing-like fashion and being free to expand or contract without straining or deforming the gripper means. The precise means of 120 attachment ofthe shielding plate to the main body of the gripper means is not critical and may for example simply comprise bolts passing through the shielding plate and through spacing collars to engage in threaded holes in the body ofthe gripper means. 125 An embodiment ofthe present invention will now bedescribed by way of examplewith reference to the accompanying drawings, in which:
Figure 1 is a schematic side elevation of a printing apparatus according to the present invention; 130 Figure2 is a schematic cross-section through the
2
GB2 191 175 A
2
mid-point of a gripper means according to the invention; and
Figure 3 is a perspective view of an alternative shielding plate forthe gripper means of Figure 2.
5 Referringto Figure 1, there is shown asheet printing apparatus 1, for example an offset litho printing apparatus, having a sheet supply unit 2 arranged to supply sheets 3, for example of paper or card, to a printing station 4 at which a radiation 10 curable ink is printed onto the upper surface ofthe sheets by print roll 5 which is itself supplied with the ink by inker roll 6.
The leading edge of each sheet leaving the printing station 4 is engaged by a gripper means 7 driven by 15 conveyor8andthesheetsarethereby conveyed past a curing station 9 to a sheet receiving and stacking unit 10. At the curing station 9, the printed surfaces of the sheets are exposed to curing radiation from an array of curing lamps 11, for example UV orlR 20 emitting lamps, disposed transversely to the sheet transport direction. The curing lamps preferably extend for at least the full widths ofthe sheets and may be provided with reflectors 12 to increase the intensity of curing radiation directed at the sheets. 25 With sheets having widths and lengths of about 1400 mm and a print rate of about 4-5,000 sheets per hour, a UV curing lamp array atone curing station might be expected to operate at about 30-50 kW,for example 34 kW. Operating under such conditions 30 using conventional unshielded gripper means, the temperature of the gripper means has been found to reach unacceptably high levels of 80°C or higher after only about 2 hours of operation. According to the present invention therefore the apparatus shown in 35 Figurel hasthegrippermeans7providedwitha shielding plate 13 which serves to shadow it from directed radiation from the curing lamps 11.
The gripper means 7 and the shielding plate 13 are shown schematically in cross-section in Figure 2 40 where sheet 3 is shown gripped between the jaws of the lower 14 and upper 15 members ofthe gripper means. Thealuminium lowerand uppermembers are mounted from the drive belts of conveyor 8 by means of a steel drive bar 16 which passesthrough 45 collars 17 on the gripper means. The shielding plate 13, conveniently of polished stainless steel, is secured to the upper surface ofthe upper member 15 at its mid-point by means of bolts 18 which engage with threaded holes in the upper member. To ensure 50 thatthe shielding plate is adequately spaced apart from the upper member, the bolts 18 are provided with spacing collars 19. It will be appreciated therefore that conventional gripper bars and wagons may readily be modified to carry a shielding plate 13 55 simply by tapping holes to receive bolts 18. The shielding plate 13 shown in Figure 2 has smooth,flatupperand lowersurfaces. However, as shown in Figure 3, the lowersurface, the surface facing the main body ofthe gripper means, may be 60 provided with fins 20 to increase heat loss to the airflow and to direct the heated airflow (in the direction ofthe arrows shown in the Figure) towards the sides ofthe printing apparatus.
65
Claims (15)
1. A sheet printing apparatus having at least one printing station for sheet printing, sheettransfer meansfor conveying printed sheets, and radiation curing means arranged to direct curing radiation onto sheets conveyed by said sheettransfer means,
said sheettransfer means comprising a sheet gripper means whose length extends transversely across the sheet feed direction ofthe sheettransfer means, wherein said gripper means has attached thereto and spaced therefrom a shielding plate extending along at least part of the length of said {
gripping means, said shielding plate having as the surface remote from the gripper means a radiation reflecting polished surface which serves to shadow said gripper means from directed radiation from said radiation curing means.
2. Apparatus as claimed in claim 1 wherein said shielding plate is provided on the surface facing the main body of said sheet gripper means with fins or vanes.
3. Apparatus as claimed in claim 2 wherein said fins or vanes extend generally transversely relative to said gripper means.
4. Apparatus as claimed in claim 2 wherein said fins or vanes are angled towards the ends of said grippermeans.
5. Apparatus as claimed in any one of claims 1 to
4 wherein said shielding plate is mounted from the main body of said gripper means by mounting means disposed atthe mid-portion of said shielding plate.
6. Apparatus as claimed in any one of claims 1 to
5 wherein said shielding plate is of stainless steel.
7. Apparatus as claimed in any one of claims 1 to
6 wherein said radiation curing meansare ultra-violet or infra-red emitting lamps.
8. Sheet printing apparatus substantially as herein described with reference to the accompanying drawings.
9. An elongate sheet gripper meansfor a sheet printing apparatus having extending thereover and spaced apart therefrom a shielding plate the outer surface whereof is reflective.
10. An elongate sheet gripper means as claimed in claim 9 wherein said shielding plate is provided on the surface facing the main body of said sheet gripper means with fins or vanes.
11. An elongate sheet gripper means as claimed in claim 10 wherein said fins or vanes extend generally transversely relative to said gripper means.
12. An elongate sheet gripper means as claimed in claim 10 wherein said fins or vanes are angled towards the end of said grippermeans.
13. An elongate sheet gripper means as claimed in any one of claims9to 12whereinsaidshielding plate is mounted from the main body of said gripper means by mounting means disposed atthe mid-portion of said shielding plate.
14. An elongate sheet gripper means as claimed in any one of claims 9 to 13 wherein said shielding plate is of stainless steel.
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3
GB2 191 175 A
3
15. An elongate sheet gripper means substantiallyas herein described with reference to the accompanying drawings.
Printed for Her Majesty's Stationery Office by Croydon Printing Company (UK) Ltd, 10/87, D8991685.
Published by The Patent Office, 25 Southampton Buildings, London, WC2A1 AY, from which copies may be obtained.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08613865A GB2191175A (en) | 1986-06-06 | 1986-06-06 | Improvements in and relating to printing apparatus |
| EP87304999A EP0252602A1 (en) | 1986-06-06 | 1987-06-05 | Sheet gripper for printing machines |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08613865A GB2191175A (en) | 1986-06-06 | 1986-06-06 | Improvements in and relating to printing apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB8613865D0 GB8613865D0 (en) | 1986-07-09 |
| GB2191175A true GB2191175A (en) | 1987-12-09 |
Family
ID=10599099
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08613865A Withdrawn GB2191175A (en) | 1986-06-06 | 1986-06-06 | Improvements in and relating to printing apparatus |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0252602A1 (en) |
| GB (1) | GB2191175A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19527439A1 (en) * | 1995-07-27 | 1997-02-06 | Heidelberger Druckmasch Ag | Gripper bridge for printing machine arms |
| EP1004438A1 (en) * | 1998-11-18 | 2000-05-31 | MAN Roland Druckmaschinen AG | Hollow profiled gripper body |
| CN109803830A (en) * | 2016-09-21 | 2019-05-24 | 柯尼格及包尔公开股份有限公司 | Handgrip trolley, the machine of processing single sheet paper with handgrip trolley and radiation dryer and the method for transmitting sheet-fed |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6626593B2 (en) * | 2001-10-16 | 2003-09-30 | Intel Corporation | Pen printer |
| DE10304617B4 (en) * | 2002-03-06 | 2016-10-27 | Heidelberger Druckmaschinen Ag | Sheet feeder for a sheet processing machine |
| DE102011087625A1 (en) | 2011-01-03 | 2012-07-05 | Koenig & Bauer Aktiengesellschaft | Sheet conveying apparatus has sheet guiding element with Venturi nozzles that are arranged with compressed-air orifices for blowing air stream in sheet conveying direction, and for adjusting flow of air stream |
| DE102016015749A1 (en) | 2016-09-21 | 2018-03-22 | Koenig & Bauer Ag | Sheet processing machine with radiation dryer |
| DE102023103173B3 (en) * | 2023-02-09 | 2023-12-28 | Koenig & Bauer Ag | Drying device for drying a surface of a sheet-shaped substrate printed and/or painted by a printing press by applying heat |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2608661C3 (en) * | 1976-03-03 | 1983-11-17 | M.A.N.- Roland Druckmaschinen AG, 6050 Offenbach | Device for printing and subsequent drying of sheets in a gripper connection |
| DD211760A1 (en) * | 1982-12-01 | 1984-07-25 | Hans Zimmermann | GRIPPING CARTS IN EQUIPMENT OF ARC PRINTING MACHINES |
-
1986
- 1986-06-06 GB GB08613865A patent/GB2191175A/en not_active Withdrawn
-
1987
- 1987-06-05 EP EP87304999A patent/EP0252602A1/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19527439A1 (en) * | 1995-07-27 | 1997-02-06 | Heidelberger Druckmasch Ag | Gripper bridge for printing machine arms |
| US5758576A (en) * | 1995-07-27 | 1998-06-02 | Heidelberger Druckmaschinen Ag | Gripper bar for deliveries of printing presses |
| DE19527439C2 (en) * | 1995-07-27 | 2002-10-24 | Heidelberger Druckmasch Ag | Gripper bridge for printing machine arms |
| EP1004438A1 (en) * | 1998-11-18 | 2000-05-31 | MAN Roland Druckmaschinen AG | Hollow profiled gripper body |
| CN109803830A (en) * | 2016-09-21 | 2019-05-24 | 柯尼格及包尔公开股份有限公司 | Handgrip trolley, the machine of processing single sheet paper with handgrip trolley and radiation dryer and the method for transmitting sheet-fed |
| CN109803830B (en) * | 2016-09-21 | 2020-01-07 | 柯尼格及包尔公开股份有限公司 | Gripper carriage, sheet processing machine with gripper carriage, radiation dryer and method for transporting sheets |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8613865D0 (en) | 1986-07-09 |
| EP0252602A1 (en) | 1988-01-13 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |