Chapter overview

1

CPC 42 Autoregister

1 Operation 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Ink zone selection 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 CPC 42 Autoregister basic display 7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 Fault codes 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4 Faults without fault code 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 Sensor bar 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 Lamp module 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.7 Fuse 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2 Control marks 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1 Structure 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 Dimensions 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 Mounting control marks 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1 Types of mounting 15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 Space requirement 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3 Mounting area 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4 Mounting rules 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 Single positive mounting 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6 Single negative mounting 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.7 Positive mask mounting 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8 Negative mask mounting 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.9 Copying machine 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.10 Incorrect mounting 22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter overview

2

CPC 42

3

1 Operation

1.1 Ink zone selection

1

01

2

Press the Basic display button (Fig. 1/1).

Press the CPC 42 Autoregister button(Fig. 1/2).

The disable LEDs will flash (Fig. 2/1), and the dis-able LEDs of the control mark zones last enteredwill light up (Fig. 2/2).

If the preceding print job is continued, do notpress any ink zone buttons.

Note:No control mark search takes place!

229 30 31 32

CPC 42

4

In the case of a new print job or if the controlmarks have not yet been found, press the plusor minus button of the zone (search area 1 inkzone) or the zones (search area 2 ink zones)in which the control marks lie (Fig. 3/1).

Note:In order to reduce the number of wastesheets during the control mark search, amaximum of 6000 copies/h should beproofprinted!

Search area 1 ink zone:The search area is 11 mm in both directionsmeasured from the centre of the ink zone(Fig. 4/1). Press the corresponding ink zone but-ton, even if the control marks are in the same inkzone as in the job before!

Note:This is the only way a control marksearch is carried out!

Search area 2 ink zones:The search area is 11 mm in both directionsmeasured from the centre of the ink zone bound-ary (Fig. 4/2). Press both adjacent plus or minusbuttons simultaneously.

Note:The two search areas are each 22 mmwide and partially overlap. If the controlmarks lie in the overlap area (Fig. 4/3),search area 1 ink zone or search area2 ink zones can be selected.

The selected ink zones will be shown on theCPC 42 Autoregister display (Fig. 5/11).

3

Search area2 ink zones(n and n+1)

32.5mm 32.5mm

Ink zone (n) Ink zone (n+1)

11mm

Search area 1 inkzone (n)

4

11mm

16.25mm

11mm 11mm

11mm 11mm

Search area 1 inkzone (n+1)

16.25mm

Overlap area

CPC 42

5

The following tables specify the ink zone(s) tobe entered dependent on the distance of thecontrol marks on the printing plate to theplate edge.

SM 74

Distance of the centre of thecontrol mark from the plate edge

in mm(D.S. or O.S.)

Ink zone button(s)(with distance measured

from D.S.)Ink zone button(s)

(with distance measured from O.S.)

0 ... 21.5 1 2321.5 ... 39 1 + 2 22 + 2339 ... 55.5 2 2255.5 ... 72 2 + 3 21 + 2272 ... 88 3 2188 ... 104 3 + 4 20 + 21

104 ... 120.5 4 20120.5 ... 137 4 + 5 19 + 20137 ... 153 5 19153 ... 169 5 + 6 18 + 19

169 ... 185.5 6 18185.5 ... 202 6 + 7 17 + 18202 ... 218 7 17218 ... 234 7 + 8 16 + 17

> 234 8 *) 16 *)

*) These ink zones cannot be searched throughentirely anymore (observe mounting area ofcontrol marks).

CPC 42

6

SM 102, CD 102

Distance of the centre of thecontrol mark from the plate edge

in mm(D.S. or O.S.)

Ink zone button(s)(with distance measured

from D.S.)Ink zone button(s)

(with distance measured from O.S.)

0 ... 16.5 1 3216.5 ... 34 1 + 2 31 + 3234 ... 50.5 2 3150.5 ... 67 2 + 3 30 + 3167 ... 83 3 30

83 ... 99.5 3 + 4 29 + 3099.5 ... 115.5 4 29115.5 ... 132 4 + 5 28 + 29132 ... 148 5 28148 ... 164 5 + 6 27 + 28

164 ... 180.5 6 27180.5 ... 197 6 + 7 26 + 27197 ... 213 7 26213 ... 229 7 + 8 25 + 26

229 ... 245.5 8 25245.5 ... 262 8 + 9 24 + 25262 ... 278 9 24278 ... 294 9 + 10 23 + 24294 ... 313 10 23

CPC 42

7

1.2 CPC 42 Autoregister basic display

5

01

2

If the printing unit buttons (Fig. 5/1) are notpressed, the entries will refer to all printing unitsand the pictogram Total mode (Fig. 5/2) will ap-pear on the display. Selected printing units andregisters are shown in negative (pictogram back-ground light). The printing unit buttons of controlmarks which have been selected but not foundwill flash. No entries are effective until the buttonRun is pressed (Fig. 5/10).

If the automatic control is only to be executedfor individual printing units or if only specificprinting units are to be used, select/deselectthe corresponding printing units (Fig. 5/1) andthen press the CPC 42 Autoregister button(Fig. 5/3).

Control of the individual registers always refersto one colour, called the standard colour. Thismust be determined at the start, and is, as arule, black. Press the corresponding printingunit button (Fig. 5/1) and then the Standardcolour button (Fig. 5/4). In the total mode, youcan alternatively press the Standard colour

button (Fig. 5/4) and change the standard col-our with the left-hand +/ buttons.

Note:If no colour is selected, black will auto-matically become the standard colour! Example:In the case of a 6-colour print on a 4-col-our printing press, 2 colours will not beprinted until the 2nd pass. The colourblack, already printed in the 1st pass, willbecome the standard colour in the 2ndpass.

If the printing unit of the selected stan-dard colour is not selected, it will not bepossible to switch on the CPC 42 Autore-gister!

Confirm all entries with the Run button(Fig. 5/10).

In order to exclude or include individual regis-ters from/in the control, select/deselect thecorresponding printing units and then press thebutton for the register:

CPC 42

8

Circumferential register (Fig. 5/5) Lateral register (Fig. 5/6) Diagonal register (Fig. 5/7)Confirm the entries by pressing the Run but-ton (Fig. 5/10).

The allocation of the individual colours to theprinting units must be made in the menu ofCPC 1-04. It is important to keep in mind thatCPC 42 identifies the colour of a control markby means of the position of this mark in thecontrol mark sequence (see table below)! If,for instance, a special colour is called S1, CPC42 will search for the corresponding mark atthe 9th position. It is necessary therefore touse control mark sequences for at least 9 col-ours, even though only 5 colours are used forprinting. Otherwise CPC 42 is not capable offinding the control marks ( fault code 60). Toavoid the use of unnecessarily long controlmark sequences, the special colour can alsobe called X. The corresponding control markmust then be mounted in the 5th position andthe available control mark sequences for 6 co-lours can be used.

Colour Position of markBlack 1Cyan 2

Magenta 3Yellow 4

X 5Z 6U 7V 8S1 9S2 10S3 11S4 12S5 13S6 14S7 15S8 16

To carry out corrections to the automatic regis-ter control, move the corresponding registers inthe production run display with CPC 42switched on.

The adjustment values of the manual registercorrections can be stored for the next job. Thisis done by pressing the Delete button.

Note:If the adjustment values shall remainstored even after switching off, CPC 42has to be deselected using the Deletebutton (Fig. 5/9) before the CPC 1-04control console is switched off. The ad-justment values will remain stored andcan be used again when CPC 42 is re-activated.

If all or individual adjustment values are not tobe taken over, e. g. in case of a new job, thedesired printing units have to be selected andthe Correction values zero (Fig. 5/8) buttonspressed. The Correction values zero aretaken over by pressing the Run button(Fig. 5/10).

With the Delete button (Fig. 5/9) CPC 42 canbe switched off for all registers. The Run but-ton is used to switch CPC 42 on again.

Note:If the control marks have not yet beenfound before switching off (Fault code60), or if the job is changed, the colourzone(s) must be input again (see pages5 and 6).

CPC 42

9

1.3 Fault codes

If there is a fault in the CPC 42 Autoregister, thefault code will be displayed in the basic display(Fig. 5/12) and in the production run display(Fig. 6/1) (only if the CPC 42 Autoregister isswitched on).

6

01

2

300965

D.S. O.S.

Fault code 60: Control marks not yet found.

This fault code should go out at the latest 50sheets after command initiation. If not:

Switch the CPC 42 Autoregister off and onagain and make sure to enter the correct con-trol mark zone(s)(see also the tables on page5 and 6). If the control marks lie in the bor-der area of the two ink zones, both adjacent inkzone buttons must be pressed.

Clean the measuring window of the sensor bar.

Check the print image. The problem could bedue to incorrect mounting. See page 22.

Check the halogen lamp and replace it, ifnecessary.

If printing is done with sheet reversal, sheetreversal has to be set on CPC 1-04.

Check for correct inking/printing unit allocation(see page 8).

Check if selected standard colour and blackseparation are on the print sheet.

CPC 42

10

Fault code 62: Individual control marks arenot found.In the basic display of CPC 42, the printing unitpictograms or colours of the control markswhich were not found flash in the total mode.

Check the control marks on the print sheet (it ispossible that the control marks are too far apartlaterally).

Ink density of the corresponding colours toolow.

Clean the measuring window of the sensor bar,if necessary.

Fault code 63: The CPC 42 Autoregister haslost a complete control mark sequence.

Check the control marks on the print sheet.

Clean the measuring window of the sensor bar,if necessary.

Check the halogen lamp and replace it, ifnecessary.

Check if selected standard colour and blackseparation are on the print sheet.

Fault code 64: Sensor on drive side has mo-ved against end stop.

Fault code 65: Sensor on operator side hasmoved against end stop.

Fault code 66: Both sensors have movedagainst the end stops.

It is possible that a wrong control mark zone wasentered.

If the zones are correctly entered but the controlmark sequence is in fact mounted within thesmallest possible press sheet size minus 10 mm,new plates will have to be copied on which thecontrol marks are located further outside in orderto be able to work with the CPC 42 Autoregister.

Fault code 67: At least one diagonal registerat upper and one diagonal register at lower li-mit of setting range.

Note:If a register reaches a limit of its settingrange, the automatic control first tries tocompensate for this by readjusting all theother corresponding registers. If thisfails, the fault code appears.

Switch off the CPC 42 Autoregister.

Shift the plate into a better position.

Switch the CPC 42 Autoregister back on.

Fault code 68: At least one lateral or circum-ferential register at upper and one lateral orcircumferential register at lower limit of settingrange.

Note:If a register reaches the end of its settingrange, the automatic control first tries tocompensate for this by readjusting all theother corresponding registers. If thisfails, the fault code appears.

Switch off the CPC 42 Autoregister.

Adjust a better position with the help of thecoarse register or by shifting the plate.

Switch the CPC 42 Autoregister back on.

Fault code 69: Communication error betweenCPC 1-04 and CPC 42 Autoregister.

Replace fuse if necessary (see page 12).

CPC 42

11

1.4 Faults without fault code

Inaccurate register control:

Faulty mounting of the control marks on theprinting plate (see page 22).

Registers are moved to end stops:

Incorrect inking/printing unit allocation (seepage 8).

1.5 Sensor bar

The sensor bars are located in the printing unitsin front of the delivery and in front of each sheetreversing device, opposite the impression cylinder(Fig. 7/1).

Caution!The sensor bar is a shock and pres-sure-sensitive precision measuring in-strument. Do not open it under any cir-cumstances.

There are two measuring windows on the under-side of the sensor bar. Splashes of ink, residuesof powder, paper dust or washup fluid on themeasuring windows may cause malfunctions.

7

SM74SM102 / CD102

SM74: Slide the sensor bar in its guide rails to-wards delivery direction and turn it slightly. Cleanthe measuring windows with a lint-free cloth satu-rated with alcohol, water or washup fluid.

SM102, CD102: Push a lint-free cloth saturatedwith alcohol, water or washup fluid between thesensor bar and the impression cylinder and usethis to clean the measuring windows.

Caution!Remove any residues of washup fluidafter cleaning!

CPC 42

12

1.6 Lamp module

Upon activating the CPC42, the halogen lamp inthe control box at the printing unit must light up.After switching on CPC 1-04, the press must havemade at least one revolution. If the halogen lampdoes not light up subsequently, it could be defec-tive.

To replace the halogen lamp:

Switch off CPC 1-04.

8

Open the control box.

Pull out the plug (Fig. 8/1) and carefully pushthe lamp module (Fig. 8/2) forwards and off thesupport plate (Fig. 8/3).

Caution!Only hold the halogen lamp by the lamp-holder! On no account clean the reflec-tion mirror as this will ruin it!

Only use an original replacement part as thishas been dimensioned together with the lamp-holder to the correct focal length!

Carefully push the new lamp module backalong the guide rails ( Fig. 8/4) of the supportplate, until it engages in the final position.

Remove the protective foil from the lamp mod-ule!

Connect the plug and close the control box.

1.7 Fuse

9

One cause of fault code 69 (communication errorbetween CPC 1-04 and Autoregister CPC 42) canbe a defective fuse in the control box. Neither thehalogen lamp nor the yellow LED on the elec-tronic board are lit.

Switch off CPC 1-04 and open the control box.

Replace the fuse (Fig. 9/1). Close the control box.

CPC 42

13

2 Control marks

There are control mark films for positive andnegative copies. The space requirement for thecontrol mark sequence is as follows:

4 mm in lateral direction

number of colours x 16 mm + 23.5 mm in cir-cumferential direction (including 5mm print-freemargin before and after the control marks).

2.1 Structure

Fig. 10 shows the colour separations of a 6-colourcontrol mark sequence for a normal four-colourset.

For visual checks, the small register crosses(Fig. 10/1) should be retained in each colour sep-aration.

Note:In order to save space, the registercrosses can be dispensed with. They arenot required for automatic control.

All transverse marks (Fig. 10/2) and the diagonalmark above the colour yellow (Fig. 10/3) are ref-erence marks. They are absolutely essential formeasuring, but may only be included in the blackseparation. If no black is printed, they should bein the separation of the darkest colour, and thiscolour should be declared as black on theCPC1-04 console.

2

10

6 6 6 6

CPC 42

14

2.2 Dimensions

11

45678

Start sequence

Colour black

2

Minimum space requirement

1.5

4 colours

1.51.51.51.52

1.51

1.5

4

0.5

2.5

4

1.51

1.5

0.5

2.5

4

Colour cyan

0.5

2.5

4

1.51

1.5

Colour N

Closing sequence

1.51

1.5

4

8 colours

Original size

1

1

1

6 colours

or

Reference mark(black)

Reference mark(black)

Reference mark(black)

Colours Circumferen-tial directionLateraldirection

87.5mm103.5mm119.5mm135.5mm151.5mm

4mm *4mm *4mm *4mm *4mm *

* By limiting the detection range of the control-ler, the lateral margin can be dispensed with.Then only 2mm are required.

Diagonal mark after the colour yellow !

CPC 42

15

3 Mounting control marks

3.1 Types of mounting

12

Single negativemounting:

Single positivemounting:

Positivemask mounting:

Negativemask mounting:

On dispatch of the printing press, 1 set of originalfilms is enclosed in the document case. Furtheroriginal films can be ordered under the HDMnumber CP.186.9200. Two pages of the originalfilm are master films of which only copies shouldbe used. You may produce as many copies asyou like for your own use. The 3-page original filmconsists of a positive master film, a negativemaster film and a proof (print sample). The fol-lowing films are used for the mounting of controlmarks (Fig. 12):

Positive master film:

Single positive mounting

Positive mask mounting

Negative master film:

Single negative mounting

Negative mask mounting

The films are to be used for contact exposure offilm onto plate. If the films for the copy do not liedirectly on the plate, a film with either larger

(positive) or smaller (negative) control marksmust be made, so that the marks in the printimage conform to the required size.

CPC 42

16

3.2 Space requirement

The space requirement for each control mark is4mm in the lateral direction. In the circumferentialdirection, the space requirement depends uponthe number of colours involved.

Space required for:

4 colours: 87.5mm (77.5mm control marks, 5mm before and afterthe control marks).

5 colours: 103.5mm (shorten 6-colour film).

6 colours: 119.5mm.

7 colours: 135.5mm (shorten 8-colour film).

8 colours: 151.5mm.

A print-free margin of approx. 1mm in lateraldirection and approx. 5mm in circumferentialdirection should be left around the control marksequence. If required by the available space, thelateral margin can be dispensed with by limitingthe detection range of the controller.

3.3 Mounting area

If possible, the control marks should be mountedon the print-free margin. If there is no print-freemargin, they can be positioned in the subject.

Always mount the control marks in pairs and atthe same distance from the front edge of thesheet. The control marks must be at least100mm away from the front edge of the sheetand at least 120mm from the rear edge of thesheet (Fig. 13). At the sides, the control marksmay only reach max. 10mm into the minimumpermitted print format of the press.

13

Min. permittedprint format

Max. permitted format

Front edge of sheet

Rear edge of sheet10mm 10mm

Permitted mounting area for control marks

Print sheet

100mm

120mm

CPC 42

17

3.4 Mounting rules

14

Start sequence

Colour black

Colour cyan

Colour magenta

Colour yellow

Colour X

Colour Z

Closing sequence(black)

Reference mark(black)

Reference mark(black)

Reference mark(black)

Reference mark(black)

Reference mark(black)

Reference mark(black)

5 66

56

Make sure the control marks are not mountedlaterally reversed. The letters before and afterthe control marks must appear as right-readingon the printing plate (Fig 14).

For the colour allocation with CPC1-04 and thequality control CPC21, the separations of thecontrol mark sequences and of the colour con-trol bar must agree with the printing plate, e.g.the cyan separation of the colour control barmust be mounted on the cyan colour separa-tion film with the separation C of the controlmark sequence.

Each control mark sequence on the print sheetmust contain the separation black.

Each separation may only be mounted onceper control mark sequence.

The optimal arrangement, in particular for diag-onal register corrections, is with the controlmarks as far outside on the sheet as possible.Principally the control marks can be placed upto 10mm into the minimum print format of thepress.

On the right and left sides, the start of the con-trol marks must be at the same distance fromthe front edge.

The small register crosses and letters placedbefore and after are only used for visualchecks and can be dispensed with if space islimited.

Even if the diagonal register control is notused, the control marks must always bemounted in pairs.

The control marks must be legible from thesheet alignment. The start sequence of thecontrol marks is positioned at the front edge ofthe sheet.

In 4-colour printing, the diagonal mark after(above) the colour yellow also serves as theclosing sequence. If there are more than 4 col-ours, count it as one of the reference marks.

CPC 42

18

3.5 Single positive mounting

15

CYAN

For each colour separation the correspondingcontrol mark separation is cut out of the controlmark film, mounted on the mounting film and ex-posed onto the printing plate (Fig. 15). The con-trol mark separations can be identified by theircolour code. Hence the control mark separationC is mounted on the color separation Cyan.

During mounting ensure that the control markseparations come to lie exactly one above theother on the individual mounting films, and thatthey also exactly fit the mounted film. To facilitatemounting, small register crosses are placed be-fore and after. The mounting accuracy deter-mines the measuring accuracy on the print sheet.

3.6 Single negative mounting

16

CYAN

The procedure for single negative mounting,which is seldom used, is the same as for singlepositive mounting. For each colour separation thenegative of the corresponding control markseparation is mounted and exposed onto theprinting plate (Fig. 16). The control mark separ-ations can be identified by their colour code.Hence the control mark separation C ismounted on the color separation Cyan.

During mounting ensure that the control markseparations come to lie exactly one above theother on the individual mounting films, and thatthey also exactly fit the mounted film. To facilitatemounting, small register crosses are placed be-fore and after. The mounting accuracy deter-mines the measuring accuracy on the print sheet.

CPC 42

19

3.7 Positive mask mounting

With this mounting process, 2 exposures have tobe carried out per printing plate of a colour set.

On the mounting film for the first exposure of theplates, the film copies of the corresponding sep-aration and the mask of the control mark separ-ation belonging to it are mounted, e.g. films forcyan and control mark mask for cyan (Fig. 17).The masks are to be made by you. On the sec-ond mounting film for the second exposure, thecomplete control marks and masks for the filmcopies are mounted (Fig. 18). This mounting filmis exposed onto all plates of the colour set.

With mask mounting, mounting inaccuracies be-tween the individual control mark separations arethus prevented. In this way, a clearly better regis-ter precision can be achieved on the print sheet,provided the film copies are mounted precisely.

17

CYAN

18

CPC 42

20

3.8 Negative mask mounting

For negative mask mounting 2 mounting films arerequired per printing plate . However, the addi-tional exposure necessary for positive maskmounting is not required since the mask of thecontrol mark separation and the correspondingcolour separation are exposed simultaneously onthe printing plate.

On the first mounting film the film copies of thecorresponding colour separations and the maskof the control mark separations belonging to themare mounted, e.g. films for cyan and control markmask for cyan (Fig. 19). The masks are to bemade by you. To be able to mount the controlmark masks, the second mounting film must firstbe produced (Fig. 20). This film contains the com-plete negative control marks and a mask whichleaves the film copies uncovered.

With mask mounting, mounting inaccuracies be-tween the individual control mark separations arethus prevented. In this way, a clearly better regis-ter precision can be achieved on the print sheet,provided the film copies are mounted precisely.

19

CYAN

20

CPC 42

21

3.9 Copying machine

When using control marks to expose printingplates in the copying machine, ensure that thecontrol marks or the control mark separations aremounted exactly in the centre of the mountingfilm for the copying machine by means of a posi-tioning sheet.

Single positive mounting

21

For each colour separation, an additional mount-ing film is made once for the copying machine,and this film contains only the corresponding con-trol mark separation, e.g. cyan (Fig. 21). Thiscontrol mark separation is exposed onto the print-ing plate by means of an additional exposure.When doing this, ensure that the allocation ofcontrol mark separation and printing plate is cor-rect. When mounting the films, the individual con-trol mark separations must lie exactly one abovethe other.

The mounting accuracy determines the measur-ing accuracy on the print sheet. The mountingfilms produced for the individual control mark sep-arations can be reused for each new job.

In the case of machines with automatic masking,single positive mounting is obligatory.Positive mask mounting is not recommendablefor copying machine exposures.

Negative mask mounting

22

With negative mask mounting, first of all a mount-ing film is made for all colour separations, onwhich the complete control marks are mounted(Fig. 22/1).

Per colour separation a second film must then bemade, which will only contain the mask for thecorresponding colour separation (Fig. 22/2). Themasks are to be made by you. For the exposureboth films are laid over one another and are sim-ultaneously exposed onto the printing plate.

Thus only the corresponding control mark separ-ation is exposed onto each printing plate. Duringexposure, ensure that the allocation of printingplate and control mark mask is correct.

With mask mounting, mounting inaccuracies be-tween the individual control mark separations areprevented, and thus a clearly better registerprecision can be achieved on the print sheet.

CPC 42

22

3.10 Incorrect mounting

Malfunction of the automatic register controlthrough CPC 42 is often due to incorrectlymounted control marks. Below the most typicalmistakes are listed. They can be seen on theprint sheet or the printing plate.

23

Print image on the print sheetwith incorrect mounting Type of fault

Control marks too close to tail edge of print. Observe the mounting area.Fault code 60.See page 16.

Reversed mounting (1) or control mark sequenceturned by 180 (2).

Spots, lines, etc., between the control marks (bestseen on the printing plate).

Individual control marks incomplete.

All control marks are mounted on all colour separations ofthe printing plates. On the print sheet all marks are black.

When printing with several copies, the control marksequences may be mounted on only one copy!

(1) (2)

CPC 42

23

Index

CControl mark search, 4Control marks

dimensions, 14 mounting area, 16 mounting rules, 17 structure, 13 types of mounting, 15

Copying machine, 21CPC 42 Autoregister basic display, 7

EError codes, 9Errors without fault code, 11

FFault codes, 9Faults without fault code, 11Flags. see control marksFuse, 12

HHalogen lamp, 12

IIncorrect mounting, 22Ink zone selection, 3

LLamp module, 12

MMarks. see control marksMounting control marks, 15

NNegative mask mounting, 20

Copying machine, 21

PPositive mask mounting, 19Production run display, 9

RRegister marks. see control marks

SSearch area, 4Sensor bar, 11Single negative mounting, 18Single positive mounting, 18

Copying machine, 21

CPC 42

24

CPC 42 AutoregisterOperationControl marksMounting control marksIndex