GB2073667A - Printing apparatus - Google Patents
Printing apparatus Download PDFInfo
- Publication number
- GB2073667A GB2073667A GB8111166A GB8111166A GB2073667A GB 2073667 A GB2073667 A GB 2073667A GB 8111166 A GB8111166 A GB 8111166A GB 8111166 A GB8111166 A GB 8111166A GB 2073667 A GB2073667 A GB 2073667A
- Authority
- GB
- United Kingdom
- Prior art keywords
- densitometer
- printing
- measurement
- printing machine
- remote control
- 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
- 238000005259 measurement Methods 0.000 claims abstract description 20
- 230000003068 static effect Effects 0.000 claims abstract description 14
- 238000001739 density measurement Methods 0.000 claims description 14
- 238000011156 evaluation Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 230000000007 visual effect Effects 0.000 claims description 2
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F33/00—Indicating, counting, warning, control or safety devices
- B41F33/0036—Devices for scanning or checking the printed matter for quality control
- B41F33/0045—Devices for scanning or checking the printed matter for quality control for automatically regulating the ink supply
Landscapes
- Engineering & Computer Science (AREA)
- Quality & Reliability (AREA)
- Inking, Control Or Cleaning Of Printing Machines (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
Printing apparatus comprising a printing machine (2) and a remote control desk (4) includes a densitometer arrangement in the form of a single densitometer (3) designed for static and dynamic measurement of colour density, the densitometer being suitable for use in static measurement at the control desk (4) and also for dynamic measurement at the impression cylinder (1) of the last printing unit of the printing machine (2). Thus, by using the same densitometer head at the two measurement portions, problems with calibration are avoided. <IMAGE>
Description
SPECIFICATION
Printing apparatus
The present invention relates to printing apparatus, and has particular reference to-a densitometer arrangement on a printing machine and on a remote control desk associated with the machine.
Densitometers serve for determination of colour density with the aid of measurement dashes printed along a printed sheet. The determined colour density values are utilized for initial and/or subsequent alignment of ink metering elements-of a printing machine.
It is known from DE 2 728 738 to employ a statically operating densitometer on the matching table of a remote control desk for densitometric evaluation of printed sheets. The densitometer is in the form of a freely movable hand device or as traversing device connected with the matching table of the control desk.
It is also known from US PS 3 835 771 to associated a dynamic densitometer with the impression cylinder of the last printing unit of a printing machine for dynamic densitometric scanning of printed sheets in the printing machine.
This arrangement does, however, have the disadvantage that inaccuracies in ink conduction arise through inexact calibration of the two densitometers over the entire measurement range, which leads to quality reduction, particularly in high grade printing products.
There is accordingly a need for a printing apparatus, with remote control means, in which an exact ink conduction can be achieved through densitometric evaluation of printed sheets.
According to the present invention there is provided printing apparatus comprising a printing machine with a succession of printing units each including an impression cylinderi remote control means controlling the printing machine; and a single densitometer operable to carry out both static and dynamic colour density measurement, the densitometer being selectively locatable in association with the impression cylinder of the last one of the printing units for effecting dynamic density measurement and with the remote control means for effecting static density measurement.
With printing apparatus embodying the invention there is thus used a single densitometer designed for static and dynamic measurement of colour density, the densitometer being associatable in variable location with the remote control means as well as with the impression cylinder of the last printing unit of the printing machine.
An embodiment of the present invention willnow be more particularly described by way of example and with reference to the accompanying drawing, which is a schematic perspective view of printing apparatus according to the said embodiment.
Referring now to the drawing, there is shown a printing machine 2 and a remote control desk 4 with a densitometer arrangement, comprising a densitometer 3.
The densitometer 3 for dynamic measurement is associated in variable location with a printing cylinder 1 of the last one of a succession of printing units of the printing machine 2. The densitometer 3 is constructed-as dynamically and statically operating measuring device and connected with the control desk. The densitometer values are displayed at the control desk and/or used for the control of the printing machine. Mounted on the control desk is a holder, on which the densitometer 3 employed in the printing machine can be arranged.
As a result, measurement problems at the printing cylinder and measurement problems at the remote control desk are solved by a single derisitometer and calibration problems do not arise.
By this relatively simple method, an exact colour density measurement is- possible at the - remote control desk (static measurement) as well as at the printing machine (dynamic measurement).
1. Printing apparatus comprising a printing machine with a succession of printing units each including an impression cylinder, remote control means controlling the printing machine, and a single densitometer operable to carry out both static and dynamic colour density measurement, the densitometer being selectively locatable in association with the impression cylinder of the last one of the printing units for effecting dynamic density measurement and with the remote control means for effecting static density measurement.
2. Apparatus as claimed in claim 1, the control means comprising means adapted to provide a visual display of density values measured by the densitometer.
3. Apparatus as claimed in either claim 1 or claim 2, the control means being adapted to control the printing machine in dependence on density values measured by the densitometer.
4. Printing apparatus substantially as hereinbefore described with reference to and as illustrated by the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (4)
1. Printing apparatus comprising a printing machine with a succession of printing units each including an impression cylinder, remote control means controlling the printing machine, and a single densitometer operable to carry out both static and dynamic colour density measurement, the densitometer being selectively locatable in association with the impression cylinder of the last one of the printing units for effecting dynamic density measurement and with the remote control means for effecting static density measurement.
2. Apparatus as claimed in claim 1, the control means comprising means adapted to provide a visual display of density values measured by the densitometer.
3. Apparatus as claimed in either claim 1 or claim 2, the control means being adapted to control the printing machine in dependence on density values measured by the densitometer.
4. Printing apparatus substantially as hereinbefore described with reference to and as illustrated by the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DD22034080 | 1980-04-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2073667A true GB2073667A (en) | 1981-10-21 |
| GB2073667B GB2073667B (en) | 1984-01-25 |
Family
ID=5523638
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8111166A Expired GB2073667B (en) | 1980-04-10 | 1981-04-09 | Printing apparatus |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JPS56157362A (en) |
| DE (1) | DE3101179A1 (en) |
| FR (1) | FR2480188A1 (en) |
| GB (1) | GB2073667B (en) |
| IT (1) | IT1143530B (en) |
| SE (1) | SE8102283L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4838160A (en) * | 1987-11-27 | 1989-06-13 | Komori Printing Machinery Co., Ltd. | Sheet-fed rotary printing press |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60151051A (en) * | 1984-01-18 | 1985-08-08 | Toppan Printing Co Ltd | Flat base proof-reading printing machine |
| DE3438325A1 (en) * | 1984-10-19 | 1986-04-24 | Miller-Johannisberg Druckmaschinen Gmbh, 6200 Wiesbaden | MULTICOLOR SHEET PRINTING MACHINE FOR SHEET PRINTING, SHEET PRINTING AND REPRINTING WITH AT LEAST ONE BETWEEN TWO PRINTING ARCH TURNING DEVICES |
| JPH0346905Y2 (en) * | 1984-12-20 | 1991-10-04 | ||
| DE3736629A1 (en) * | 1987-10-29 | 1989-05-11 | Heidelberger Druckmasch Ag | DEVICE FOR DETERMINING THE AREA COVER |
| JP5184295B2 (en) * | 2008-10-16 | 2013-04-17 | 三菱重工印刷紙工機械株式会社 | Method and apparatus for setting target color mixing halftone density of printing press and picture color tone control method and apparatus for printing press |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2023467A1 (en) * | 1970-05-13 | 1971-11-25 | Forschungsges F Druck U Reprod | Device for measuring the color density |
| DE2728738B2 (en) * | 1977-06-25 | 1979-05-10 | Roland Offsetmaschinenfabrik Faber & Schleicher Ag, 6050 Offenbach | Eulrichtung for checking and regulating the coloring on printing machines |
-
1981
- 1981-01-16 DE DE19813101179 patent/DE3101179A1/en not_active Withdrawn
- 1981-01-30 FR FR8101906A patent/FR2480188A1/en not_active Withdrawn
- 1981-03-27 JP JP4533781A patent/JPS56157362A/en active Pending
- 1981-04-06 IT IT67477/81A patent/IT1143530B/en active
- 1981-04-09 SE SE8102283A patent/SE8102283L/en not_active Application Discontinuation
- 1981-04-09 GB GB8111166A patent/GB2073667B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4838160A (en) * | 1987-11-27 | 1989-06-13 | Komori Printing Machinery Co., Ltd. | Sheet-fed rotary printing press |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2073667B (en) | 1984-01-25 |
| IT8167477A0 (en) | 1981-04-06 |
| SE8102283L (en) | 1981-10-11 |
| FR2480188A1 (en) | 1981-10-16 |
| JPS56157362A (en) | 1981-12-04 |
| DE3101179A1 (en) | 1981-12-24 |
| IT1143530B (en) | 1986-10-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |