印刷机DEK刮刀使用手册

CHAPTER 9 SQUEEGEE MODULE
OVERVIEW
Item Description Item Description
1Squeegee Printhead Mechanism5Squeegee Drip Tray
2Rear Squeegee Stepper Motor6Rear Squeegee
3Front Squeegee7Print Carriage
4Squeegee Drip Tray Mechanism8Front Squeegee Stepper Motor
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The squeegee mechanism is driven backwards and forwards across the screen
by the print carriage.
The squeegee printhead mechanism incorporates two stepper motors to drive
the two squeegees independently down onto the screen when a print stroke is
required. During the rearward stroke, the front squeegee is in contact with the
screen performing a rear print stroke. During the forward stroke, the rear
squeegee is in contact with the screen performing a forward print stroke.
The pressure being applied during the print stroke is measured by a strain
gauge bridge (located in the spring beam assembly of the squeegee mecha-
nism) and if necessary, a correction to the pressure is made by the software.
Figure 9-1 Squeegee Sensor Locations
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Squeegee Drip Tray
Figure 9-2 Squeegee Drip Tray Overview
The squeegee drip tray mechanism secures to the underneath of the print carriage. The drip tray pneumatic actuator extends the drip tray below the squeegees to prevent print medium from dripping onto the screen during print carriage initialisation or auto screen loading.
The squeegee drip tray mechanism is also used to accommodate the auto screen loader mechanism, refer to the Adjustable Screen Mount (ASM) or Cast C Chase Module chapters for more information.
The drip tray retracted sensor is used by software to check that the pneumatic actuator has retracted the drip tray before lowering the squeegees.
NOTE
With the squeegee drip tray and the screen depth adjuster fitted, the ASM must be set to 29 inches and cannot accommodate smaller screen sizes.
ELECTRICAL SCHEMATIC
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REPLACEMENT PROCEDURES ProFlow to Squeegees
Instances may occur when the machine is required to print using the squeegee module configuration. The following procedure details how to revert the machine from ProFlow use to the squeegee configuration:Removing ProFlow 1.Select
.
2.Select
Diagnostics .
e Next or Previous to highlight ProFlow .
4.Select Select Module .
5.Ensure Home ProFlow is highlighted.
6.Select Run Diagnost .
7.Select Exit .
8.Select Exit .
9.Select
Back .
10.
.
11.Select
.
12.Select
Back .
13.Select
Shut Down and switch the mains isolator to OFF .
14.Disconnect both curly air lines from the self-seal pneumatic connectors
situated either side of the ProFlow printhead mechanism.
15.Disconnect the three ProFlow mechanism connectors from the print car-
riage, left hand side:
•ProFlow Motor
•Home Sensor
•ProFlow Paste Level Sensor (if Time to Go is enabled, an amplifier is
connected to 9PL61 and the connection is made to 9PL62 on the ampli-
fier).
16.Manually raise the ProFlow pressure mechanism by pulling the latch on the
front of the unit and lifting the mechanism to the fixed raised position.
17.Open the locking clip securing the transfer head to the pressure mechanism
and carefully slide the transfer head out and away from the pressure
mechanism as indicated in the figure below.
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18.Release the pressure mechanism from the printhead mechanism by
unscrewing the two securing bolts, using a 5mm Allen key.
19.Loosen the four captive screws securing the ProFlow printhead mechanism
to the print carriage using a 4mm Allen key. Carefully remove the mecha-
nism from the print carriage.
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Fitting Drip Tray 1.Slide the slot in the drip tray onto the bearing on the drip tray guide shaft.
2.Secure the drip tray to the actuator piston using the securing screw.
3.Open the speed control valves on the drip tray actuator.
Fitting Squeegee 1.Carefully position the rear of the printhead mechanism (spring beam
assembly) into the print carriage so that both printhead mechanism dowels
locate into the print carriage locating holes. Secure the unit to the print
carriage by means of the four captive screws, ensuring the pneumatic pipe
is not trapped.
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2.Connect the following connectors to the print carriage, left hand side:•Rear Squeegee Motor •Front Squeegee Motor •Home Sensors
•
Squeegee Pressure Amplifier
3.Fit the required configuration of squeegees to the printhead mechanism
squeegee mounts.
NOTE
Squeegee fitting information is detailed in the Replacement Procedures section of this chapter.
4.Switch the mains isolator to ON and ensure that the machine recognizes the
squeegee module fit by displaying Squeegees Uninitialised during the
Drive Belt Replacement
1..
2.Select
.
3.Select
Back .
4.Select
Shut Down
.
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Technical Reference Manual
Chapter Issue 1 Jan 07
5.Select
Continue .
6.Switch the mains isolator to OFF .
7.Open the front printhead cover/shutter.
8.Remove squeegees if fitted.
9.Remove the drive belt cover plate from the squeegee printhead mechanism
and remove the broken drive belt.
Rear Squeegee Drive Belt
3.Fit the new belt in position.
ing a cable tie wrap or similar, provide a loop around the top of the body
of the motor enabling the motor to be pulled using a force meter. Ensure that the force meter is pulled in the direction which the drive belt is fitted,figure above refers.
5.Pull the force meter until a tension of 3-4kgs is monitored on the meter.
Tighten the three screws whilst the motor is under tension.
Front Squeegee Drive Belt 1.To replace the front squeegee drive belt (left hand stepper motor), the
printhead mechanism must be removed from the print carriage.
2.Disconnect the following connectors from the print carriage, left hand side
(figure in Step 10 of ProFlow to Squeegees section refers):
•Rear Squeegee Motor
•Front Squeegee Motor
•Home Sensors
•Squeegee Pressure Amplifier
3.Remove the printhead mechanism by unscrewing the four screws securing
the unit to the print carriage.
4.Placing the unit on a secure surface, slacken off the three screws securing
the left hand motor to the support plate.
5.Fit the new belt in position.
ing a cable tie wrap or similar, provide a loop around the top of the body
of the motor enabling the motor to be pulled using a force meter. Ensure that the force meter is pulled in the direction which the drive belt is fitted, Rear Squeegee Motor Tensioning figure example refers.
7.Pull the force meter until a tension of 3-4kgs is monitored on the meter.
Tighten the three screws whilst the motor is under tension.
8.On completion re-fit the printhead mechanism to the print carriage refit the
drive belt cover plate and re-connect all leads to the print carriage, left hand side.
9.Refit the squeegees.
Fitting the Squeegees It is usual to fit two trailing edge squeegees and use the machine in the Print/ Print mode.
When fitting a single squeegee (trailing edge or diamond section) to the machine, it must be fitted to the front squeegee mount only.
The following procedure describes a double trailing edge squeegee configura-tion fit to the machine printhead mounting assembly.
1.Select Product Setup.
2.Select Change Squeegees.
3.The print carriage is driven to the front position.
Item Description Item Description
1Front Squeegee Mount5Front Squeegee
2Rear Squeegee Mount6Front Squeegee Key and Keyway Slot 3Locking Thumbscrew (in 4 positions)7Rear Squeegee Key and Keyway Slot 4Rear Squeegee
6.Fit the front squeegee to the front squeegee mount ensuring the thumb-screws are tightened finger tight.
NOTE
The locking thumbscrews on the front squeegee are positioned closer together than those fitted to the rear squeegee and the keyway slot is positioned on the right hand side of the front squeegee.7.Close the front printhead cover/shutter.8.Press the System button.9.Select
Continue .
10.Select
Back .
11.Carry out Squeegee Reference Height calibration, Calibrations section of
this chapter refers.
CALIBRATIONS
Squeegee Pressure Calibration Squeegee pressure calibration is carried out on machines, fitted with the Pressure Hardware option, after the following circumstances:
•The squeegee mechanism is replaced
•The strain gauge bridge in the squeegee mechanism is replaced
•The rising table sensors have been replaced or adjusted
A force meter calibration jig and squeegee pressure plate are required to perform the squeegee pressure calibration.
NOTE
1.Ensure that the rising table print reference height is set correctly before
commencing, (the calibration relies upon accurate positioning of the table to make a reference).
2.Ensure that the Pressure Hardware parameter in Maintenance\Machine
Setup\Options is set to FITTED.
Use the following procedure to calibrate the squeegee pressure:
WARNING
BOARD CLAMPS. EXTREME CARE MUST BE EXERCISED WHEN WORKING IN THE TOOLING AREA OF THE MACHINE TO AVOID INJURY. THE FOILS ON THE FRONT AND REAR BOARD CLAMPS ARE VERY SHARP.
1.
.
2.Select
.
3.Select Unload Screen.
4.Open the front printhead cover/shutter.
5.Remove the screen from the machine.
6.Remove the tooling from the manual tooling plate.
7.Close the front printhead cover/shutter.
8.Press the System button.
9.Select Back.
10.Select
.
11.Select
.
12.Select Pressure .
13.Select Calibrat Readings .
The rails are checked for the presence of a board, the print carriage moves to the calibration position, the rear rail moves to home position, the table homes and the board clamps are closed.
14.The machine cover is unlocked and the message ‘Fit the pressure calibra-tion rig’ is displayed with the following window:
15.Open the front printhead cover/shutter.
16.Ensure that the calibration jig is secured to the mounting plate as shown in
the following graphic:
17.Fit the calibration jig to the front squeegee position.
18. Fit the squeegee pressure plate to the rising table ensuring that the locating
dowels insert the holes of the rising table.
NOTE
During the squeegee pressure calibration the dwell height of the rear squeegee is 15mm regardless of the set up value. This height is set during calibration only.
19.Switch the force meter ON and check the reading is 0kg, (ensure the force
meter is not in contact with the squeegee pressure plate).
20.Select Continue.
21.The front squeegee mechanism steps down until a change in pressure is
detected and continues stepping down until the pressure value stored on the machine is reached. If the calibration jig displays 10kg, go to Step 25.
22.Select Jog Rig.
e the left and right jog buttons to move the front squeegee mechanism up
or down until the calibration jig displays 10kg.
NOTE
Achieving exactly 10kg may not be possible as some calibration jigs display down to three decimal places.
24.Select Set Calib..
25.Select Exit.
26.The front squeegee mechanism moves to the home position. The message
‘Confirm that the pressure calibration jig has been removed.’ is dis-
played.
27.Remove the calibration jig and the squeegee pressure plate from the
machine. On completion select Yes, the table resets, the print carriage moves to home position, board clamps open and the rear rail moves to the board width setting.
28.Carry out the Squeegee Reference Height (Pressure Feedback) calibration.
Squeegee Reference Height (Pressure Feedback)Squeegee reference height is carried out on machines fitted with the Pressure Hardware option after the following circumstances:
•Squeegee pressure calibration
•Squeegee change
Use the following procedure to set the squeegee reference height:
1.If a Ptest.dat file is not required, go to Step 7.
2.Select
.
3.Select Test Cycles.
4.Select Data Logging On.
5.Select Back.
6.Select Back.
7.Select Setup Product.
8.Select
Squeegees.
9.Select Unload Screen.
10.Open the front printhead cover/shutter.
11.Remove the screen from the machine.
12.Close the front printhead cover/shutter.13.Press the System button.14.Select
.
15.The message ‘Ensure that the correct squeegees are fitted!’ is dis-played.16.Fit the required squeegees to the front and rear squeegee mounts as
detailed in the Replacement Procedures section of this chapter.17.Select
Continue .
18.The following machine sequence is carried out:a.The rails are checked for the presence of a board.b.The rising table is driven to print height.c.The board clamps are closed.
d.The print carriage drives the front squeegee over the front rail.
e.The rear squeegee is driven down to dwell height.
f.The front squeegee is driven down by the stepper motor until contact with the board clamp is made.
g.The front squeegee continues to be driven down until a 2kg pressure difference is detected, the motor pauses.
h.The amount of steps (the stepper motor took to get to this position) and the pressure are recorded.
i.The stepper motor drives downwards another 15 steps, this is recorded with the pressure detected. This is repeated a further 18 times to achieve a total of 20 results.19.The rear squeegee is calibrated in a similar manner.
20.The message ‘Calibrate Squeegee heights complete’ is displayed.21.Select
Back .
22.Select
Back .
23.Select
.
24.Select
Test Cycles .
25.Select
Data Logging Off .
26.Select
Back .
27.Select
Back .
Ptest.dat File
The file displays 20 front squeegee readings followed by 20 rear squeegee readings, showing the relationship between steps (displacement) and pressure applied. From the readings taken, the front and rear pressure factors and squeegee reference heights are calculated. At the end of the file, 5 readings of flood pressure and reference height readings are displayed (these are also listed in the Config.txt file).
The Ptest.dat file is located on the hard drive of the machine PC. To view the file carry out the following procedure:
1.From the Windows start menu, select Programs - Accessories - Windows
Explorer .2.Under My Computer , locate and open the E:\Log\Ptest.dat file.
The figure below gives a representation of the Ptest.dat file.
Squeegee Reference Height (Non Pressure Feedback)The squeegee reference height is carried out after a squeegee change on machines without the Pressure Hardware option. This procedure must be used if Pressure Hardware is disabled.
Use the following procedure to set the squeegee reference height:
1.
.
2.Select
.
3.Select Unload Screen.
4.Open the front printhead cover/shutter.
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5.Remove the screen from the machine.
6.Fit the required squeegees to the front and rear squeegee mounts as
detailed in the Replacement Procedures section of this chapter.
7.Close the front printhead cover/shutter.
8.Press the System button.
9.Select
Back .
10.Select
Setup Product .
11.Select
Squeegees .
12.Select
.
13.The following machine sequence is carried out:
a.The rails are checked for the presence of a board.
b.The rising table is driven to print height.
c.The board clamps are close
d.
d.The print carriage drives the front squeegee over the front rail.
e.The front and rear squeegees are driven down by the stepper motor to dwell height.
14.Select Calibrate Front Squeegee .
15.The front squeegee is driven down to the current reference height position.
16.Select
Jog .
17.Open the front printhead cover/shutter.
ing a 0.1mm shim placed between the front rail and the front squeegee,
check that the shim moves with a small amount of friction.
19.If the gap is correct, go to Step 29.
20.For adjustment, select the appropriate Jog Up/Jog Down button on the
monitor.
9.22Technical Reference Manual Chapter Issue 1 Jan ing the two button controls simultaneously, jog the squeegee in the
chosen direction.
22.Recheck the gap.
23.Repeat Steps 20 to 22 until the correct gap is achieved.
24.Close the front printhead cover/shutter.
25.Press the System button.
26.Select
Back .
27.Select
Save .
28.Go to Step 31.
29.Close the front printhead cover/shutter.
30.Press the System button.
31.Select
Back .
32.Select Calibrate Rear Squeegee .
33.The rear squeegee is driven down to the current reference height position.
34.Repeat Steps 16 to 31 for the rear squeegee.
35.Select
Back .
36.Select
Back .
37.Select
Back .。