CA1193308A - Drum scanners - Google Patents
Drum scannersInfo
- Publication number
- CA1193308A CA1193308A CA000413973A CA413973A CA1193308A CA 1193308 A CA1193308 A CA 1193308A CA 000413973 A CA000413973 A CA 000413973A CA 413973 A CA413973 A CA 413973A CA 1193308 A CA1193308 A CA 1193308A
- Authority
- CA
- Canada
- Prior art keywords
- roller
- pot
- roller according
- structures
- cylindrical element
- 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
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/06—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using cylindrical picture-bearing surfaces, i.e. scanning a main-scanning line substantially perpendicular to the axis and lying in a curved cylindrical surface
- H04N1/0692—Details of the cylindrical surface
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/04—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa
- H04N1/06—Scanning arrangements, i.e. arrangements for the displacement of active reading or reproducing elements relative to the original or reproducing medium, or vice versa using cylindrical picture-bearing surfaces, i.e. scanning a main-scanning line substantially perpendicular to the axis and lying in a curved cylindrical surface
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Rolls And Other Rotary Bodies (AREA)
- Facsimile Scanning Arrangements (AREA)
- Preparing Plates And Mask In Photomechanical Process (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A roller for drum scanners is described, consisting of a hollow cylindrical element which is arranged for rotation at its ends and provided with suction openings for reception of a record carrier or of an original.
The cylindrical roller element is assembled from a plurality of individual elements which are held together by means of a rod which may be screwed to end lid members of the roller element and are also bonded to each other.
A roller for drum scanners is described, consisting of a hollow cylindrical element which is arranged for rotation at its ends and provided with suction openings for reception of a record carrier or of an original.
The cylindrical roller element is assembled from a plurality of individual elements which are held together by means of a rod which may be screwed to end lid members of the roller element and are also bonded to each other.
Description
~33~
2~
1 ~ACKGROUND 0~ THE INV~NTION
The present invention relates to rollers for drum scanners~ comp~ising a hollow cylindrical element which is rotatably mounted at its ends.
As compared to flat bed scanners, drum scanners comprise rapidly rotating rollers at the sc~nni n~ and recording stations, the ori~i n~l which is to be scanned being secured thereto at the sc~nni n~ station and the recording carrier thereto at the recording station.
~o obtain a high operating speed on such scanners, it i~
necessary to allow the roller to rotate rapidly which on the one hand leads to powerful centrifugal forces and because of the original~ having the large ~ormat deæirable nowadays renders a stable form o~ construction of the rollers necessaryO In order that the recording carrier may be held on the roller even at high speeds of revolution, the roller has ~uction openings in its surface, which are in communication with the interior which is arranged to be connected to a vacuum pump 80 that a vacuum prevails within the roller. If desired, clamping devices may be omit-ted, which could lead to an undesirable imbalance at high speeds of revolution. In view of the high precision required during image processing, a high mechanical precision is equally of importance regarding the geometry of the roller surface. In the existing methods of roller production, be it by parting off from prefabricated tubes or by turning the rollers from the solid, comparatively high costs and a heavy form of roller construction are the result~
SUMMARY 0~ THE INVENTION
~' 33~
1 Consequently it is an obiect of the invention to provide a roller which fulfils the manifold requir0ments speci~ied in respect of the same and aver-ts the dis-advantage of the known roller. The invention accomplishes this aim by providing a roller for a drum scanner 3 comprising a hollow cylindrical element which is arranged for rotation at its ends, and comprises a plurality of pot-like structures which are joined together to form a continuous outer surface. The pot like elements may inter*it one 10 ~hanother, or they may comprise a number of rings which are connected at their join~s by means of annular coupling members and bonded to each other thereat. One or more internal round metal plates assure that the round shape is maintained. Rollers in which use is made of a combin-ation o~ the a~oresaid structural features are al30envisagedO
~RIEF DE~CRIPTION OF THE DRAWINGS
In order that the invention may be more clearly understood, re~erence will now be made to the accompany-ing draw~ngs which show two embodiments thereof by wayof example and in which:-Figure 1 shows an axial section through a ~ir~tembodiment comprising pot-like ~tructures which are inter~itted one within the other, and Figure 2 shows an axial sectio~ through a ~econd embodiment comprising rings which are joined together by mean~ of annular coupling members.
DETAI~ED DESGRIPTION OF PRE~E~RED EMBODIMENTS
Re~erring now to the drawings ~igure 1 shows a roller 1 which is assembled from several parts in 1 accordance with the in~ention. At the ends are situated lids 2 and 3 which have central recesæes 21 and 31 respecti~ely, into which penetrate~ a rod 1 pas~ing along the central longitudinal axis of the roller 1 the parts being tightened together by mean~ of nuts 41 and 42.
The actual cylindrical roller element comprises pot-like structure~ 5 to 10 which are inter~itted one within the other~ a ring 18 being provided at the one extremity of the roller to establish a closure together with the lid 1.
As apparent from the drawings, the pot-like structure~ 5 to 10 are shouldered at their ends ~o that the next element may be pushed over the same. Upon assembling the individ-ual elements~ the joints between them are filled with adhesive, and the roller element is pulled together by means of the rod 4 and the nuts 41 and 42, so that a precisely cylindrical element is the result, ass~mi.ng that the end~ o~ the individual element~ had been accurately made. Suction openings 181 which have been shown only for the element 18 in the drawing, are pro~ided in the roller surXace to hold the material which is to be clamped, be it the or;~;n~l or the record carrier, on the revolving roller surface. The roller surface may be provided with several rows of such suctio~ holes throughout its surface, which are communication with a vacuum prev~;l; ng within the roller.
~ igure 2 shows a si m; l ~r structure of a roller 1, which at its ends also comprises lids 2 and 3 comparable to Figure 15 which are also centrally recessed at 21 and 31 into which projects a rod 4 which again tightens the separate pot-like elements together by means of the 33~
1 nuts 41 and 42~ However instead o~ the interfitting pot-like structures of ~igure 1, ring elements 15, 16, 17 and 18 are provided9 which are joined together at the inside at their joints by mean~ of annular coupling members 20, 21' and 22, and bonded to ea~h other. To increa~e rigidity~ at least one di~c-like element is also provided to brace the jacket o~ the cylinder and impose the round shape. Preferably a plurality of ~uch elements is provided, a~ shown at 23, 24, 25 and 26. In this case too 9 it is assure~ ~hat an e~actly cylindrical element is the result if care i~ exercised -to assure that the end portions o~ the individual elements are machined precisely.
A~ in the case of Figure 1~ the elements are clamped together by means o~ the lids 2 and 3, the rod 4 and the nuts 41 and 42. To prevent ha~ing to cover large proportions o~ the uncovered suc-tion openings upon m~k; n~
use o~ smaller ~ormats, one or more pot bases are produced without open;nes. ~he separate compartments may be ~onnected to the vacuum pipe via valves. In the case of large roller~ these pressure tight ba~eæ are endowed with a shape corresponding to the ~tress in the fashion o~ the bottom of a boiler.
The roller elements proposed in the present in~ention are partiGularly appropriate for drum scanners in the sphere of graphics or of other reproduction apparatus operating with rollers for reception of originals or r,ecord carriers.
1 ~ACKGROUND 0~ THE INV~NTION
The present invention relates to rollers for drum scanners~ comp~ising a hollow cylindrical element which is rotatably mounted at its ends.
As compared to flat bed scanners, drum scanners comprise rapidly rotating rollers at the sc~nni n~ and recording stations, the ori~i n~l which is to be scanned being secured thereto at the sc~nni n~ station and the recording carrier thereto at the recording station.
~o obtain a high operating speed on such scanners, it i~
necessary to allow the roller to rotate rapidly which on the one hand leads to powerful centrifugal forces and because of the original~ having the large ~ormat deæirable nowadays renders a stable form o~ construction of the rollers necessaryO In order that the recording carrier may be held on the roller even at high speeds of revolution, the roller has ~uction openings in its surface, which are in communication with the interior which is arranged to be connected to a vacuum pump 80 that a vacuum prevails within the roller. If desired, clamping devices may be omit-ted, which could lead to an undesirable imbalance at high speeds of revolution. In view of the high precision required during image processing, a high mechanical precision is equally of importance regarding the geometry of the roller surface. In the existing methods of roller production, be it by parting off from prefabricated tubes or by turning the rollers from the solid, comparatively high costs and a heavy form of roller construction are the result~
SUMMARY 0~ THE INVENTION
~' 33~
1 Consequently it is an obiect of the invention to provide a roller which fulfils the manifold requir0ments speci~ied in respect of the same and aver-ts the dis-advantage of the known roller. The invention accomplishes this aim by providing a roller for a drum scanner 3 comprising a hollow cylindrical element which is arranged for rotation at its ends, and comprises a plurality of pot-like structures which are joined together to form a continuous outer surface. The pot like elements may inter*it one 10 ~hanother, or they may comprise a number of rings which are connected at their join~s by means of annular coupling members and bonded to each other thereat. One or more internal round metal plates assure that the round shape is maintained. Rollers in which use is made of a combin-ation o~ the a~oresaid structural features are al30envisagedO
~RIEF DE~CRIPTION OF THE DRAWINGS
In order that the invention may be more clearly understood, re~erence will now be made to the accompany-ing draw~ngs which show two embodiments thereof by wayof example and in which:-Figure 1 shows an axial section through a ~ir~tembodiment comprising pot-like ~tructures which are inter~itted one within the other, and Figure 2 shows an axial sectio~ through a ~econd embodiment comprising rings which are joined together by mean~ of annular coupling members.
DETAI~ED DESGRIPTION OF PRE~E~RED EMBODIMENTS
Re~erring now to the drawings ~igure 1 shows a roller 1 which is assembled from several parts in 1 accordance with the in~ention. At the ends are situated lids 2 and 3 which have central recesæes 21 and 31 respecti~ely, into which penetrate~ a rod 1 pas~ing along the central longitudinal axis of the roller 1 the parts being tightened together by mean~ of nuts 41 and 42.
The actual cylindrical roller element comprises pot-like structure~ 5 to 10 which are inter~itted one within the other~ a ring 18 being provided at the one extremity of the roller to establish a closure together with the lid 1.
As apparent from the drawings, the pot-like structure~ 5 to 10 are shouldered at their ends ~o that the next element may be pushed over the same. Upon assembling the individ-ual elements~ the joints between them are filled with adhesive, and the roller element is pulled together by means of the rod 4 and the nuts 41 and 42, so that a precisely cylindrical element is the result, ass~mi.ng that the end~ o~ the individual element~ had been accurately made. Suction openings 181 which have been shown only for the element 18 in the drawing, are pro~ided in the roller surXace to hold the material which is to be clamped, be it the or;~;n~l or the record carrier, on the revolving roller surface. The roller surface may be provided with several rows of such suctio~ holes throughout its surface, which are communication with a vacuum prev~;l; ng within the roller.
~ igure 2 shows a si m; l ~r structure of a roller 1, which at its ends also comprises lids 2 and 3 comparable to Figure 15 which are also centrally recessed at 21 and 31 into which projects a rod 4 which again tightens the separate pot-like elements together by means of the 33~
1 nuts 41 and 42~ However instead o~ the interfitting pot-like structures of ~igure 1, ring elements 15, 16, 17 and 18 are provided9 which are joined together at the inside at their joints by mean~ of annular coupling members 20, 21' and 22, and bonded to ea~h other. To increa~e rigidity~ at least one di~c-like element is also provided to brace the jacket o~ the cylinder and impose the round shape. Preferably a plurality of ~uch elements is provided, a~ shown at 23, 24, 25 and 26. In this case too 9 it is assure~ ~hat an e~actly cylindrical element is the result if care i~ exercised -to assure that the end portions o~ the individual elements are machined precisely.
A~ in the case of Figure 1~ the elements are clamped together by means o~ the lids 2 and 3, the rod 4 and the nuts 41 and 42. To prevent ha~ing to cover large proportions o~ the uncovered suc-tion openings upon m~k; n~
use o~ smaller ~ormats, one or more pot bases are produced without open;nes. ~he separate compartments may be ~onnected to the vacuum pipe via valves. In the case of large roller~ these pressure tight ba~eæ are endowed with a shape corresponding to the ~tress in the fashion o~ the bottom of a boiler.
The roller elements proposed in the present in~ention are partiGularly appropriate for drum scanners in the sphere of graphics or of other reproduction apparatus operating with rollers for reception of originals or r,ecord carriers.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A roller for a drum scanner, comprising a hollow cylindrical element which is arranged for rotation at its ends 9 and comprising a plurality of pot-like structures which are joined together to form a continuous outer surface.
2. A roller for a drum scanner comprising a hollow cylindrical element which is arranged for rotation at its ends and comprising a number of pot-like structures which are interfitted one within another and also bonded together.
3. A roller for drum scanners, comprising a hollow cylindrical element which is arranged for rotation at its ends and comprising a plurality of rings which are joined together at their joints by annular coupling members and also bonded to each other.
4. A roller according to claim 3, wherein at least one circular metal plate is transversely disposed within the roller.
5. A roller according to claim 1, wherein the pot-like structures are shouldered at their ends for insertion into the next adjacent pot-like structure.
6. A roller according to claim 1, wherein the cylindrical element has lid-like members at its ends, which may be bolted together by means of a rod passing through the inside of the element.
7. A roller according to claim 1, wherein the surface of the roller is provided with suction openings which communicate with the interior of the roller.
8. A roller according to claim 7, wherein at least one of the pot-like structures has no holes in its surface and is bonded to the next structure in pressure-tight manner.
9. A roller according to claim 3, wherein a bulkhead which has a shape corresponding to the direction of pressure and to the strain caused by the same, is inset in pressure-tight manner as a complement to a base or round plate.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3143342A DE3143342C2 (en) | 1981-10-31 | 1981-10-31 | Drum for drum scanner |
| DEP3143342.1 | 1981-10-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1193308A true CA1193308A (en) | 1985-09-10 |
Family
ID=6145355
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000413973A Expired CA1193308A (en) | 1981-10-31 | 1982-10-22 | Drum scanners |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0078376A3 (en) |
| JP (1) | JPS5886546A (en) |
| AU (1) | AU8931382A (en) |
| CA (1) | CA1193308A (en) |
| DE (1) | DE3143342C2 (en) |
| DK (1) | DK477382A (en) |
| IL (1) | IL67095A (en) |
| SU (1) | SU1215610A3 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4687323A (en) * | 1985-03-07 | 1987-08-18 | Dainippon Screen Mfg. Co., Ltd. | Rotary suction drum |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59141344U (en) * | 1983-03-09 | 1984-09-21 | 大日本スクリ−ン製造株式会社 | A recording drum that can be used to attach and detach films of various sizes. |
| GB8427353D0 (en) * | 1984-10-30 | 1984-12-05 | Crosfield Electronics Ltd | Cylinders |
| DE4023530A1 (en) * | 1990-07-20 | 1992-01-23 | Berthold Ag H | Precision transporting and holding installation for printer - accurately moves original or photosensitive material in both directions by drum for scanning under effect of vacuum |
| JPH0669506U (en) * | 1993-03-18 | 1994-09-30 | ヤンマーディーゼル株式会社 | Breather mechanism of deceleration reversing machine |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE357401C (en) * | 1922-08-22 | Friedrich Schwerd Dipl Ing | Drive drum | |
| GB762453A (en) * | 1952-04-23 | 1956-11-28 | Gilbert Edward Fisher | A new or improved construction of metal cylinder, drum, roller or the like |
| DE1276688B (en) * | 1964-10-20 | 1968-09-05 | Arnstadt Fernmeldewerk | Arrangement for picture drums of facsimile devices |
| FR1454191A (en) * | 1964-12-10 | 1966-07-22 | Muirhead & Co Ltd | Drum for remote image transmission |
| DE2006880A1 (en) * | 1970-02-14 | 1971-11-11 | Karl Stumpf KG, 4000 Düsseldorf | Conical roller for roller conveyor curves |
| US3925607A (en) * | 1974-08-21 | 1975-12-09 | Singer Co | Rotary data base converter with flexible data base |
| US4268841A (en) * | 1979-06-28 | 1981-05-19 | Canon Kabushiki Kaisha | Image recording method and apparatus therefor |
-
1981
- 1981-10-31 DE DE3143342A patent/DE3143342C2/en not_active Expired
-
1982
- 1982-08-27 EP EP82107886A patent/EP0078376A3/en not_active Withdrawn
- 1982-10-10 SU SU823502652A patent/SU1215610A3/en active
- 1982-10-13 AU AU89313/82A patent/AU8931382A/en not_active Abandoned
- 1982-10-22 CA CA000413973A patent/CA1193308A/en not_active Expired
- 1982-10-28 IL IL67095A patent/IL67095A/en unknown
- 1982-10-28 DK DK477382A patent/DK477382A/en not_active Application Discontinuation
- 1982-10-29 JP JP57189358A patent/JPS5886546A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4687323A (en) * | 1985-03-07 | 1987-08-18 | Dainippon Screen Mfg. Co., Ltd. | Rotary suction drum |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0078376A2 (en) | 1983-05-11 |
| JPS5886546A (en) | 1983-05-24 |
| DK477382A (en) | 1983-05-01 |
| IL67095A0 (en) | 1983-02-23 |
| JPS6246853B2 (en) | 1987-10-05 |
| AU8931382A (en) | 1983-05-05 |
| DE3143342A1 (en) | 1983-05-26 |
| EP0078376A3 (en) | 1986-02-19 |
| DE3143342C2 (en) | 1983-10-06 |
| IL67095A (en) | 1986-02-28 |
| SU1215610A3 (en) | 1986-02-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |