OVERVIEW Screen Depth Adjuster Auto Screen Loader SemiAuto Screen Loader ELECTRICAL SCHEMATIC ADJUSTMENTS AND SETTINGS Screen Depth Adjuster Auto Screen Loader REPLACEMENT PROCEDURES Chase Rail Assembly Screen at Centre Sensor Cable Assembly CALIBRATIONS Chase to Table Level Associated Calibrations and Adjustments
ADJUSTABLE SCREEN MOUNT (ASM) OVERVIEW CHAPTER 15 ADJUSTABLE SCREEN MOUNT (ASM) OVERVIEW 16 15 14 13 12 11 10 Figure 15-1 ASM Overview Item Description Item Description ASM Chase Casting Screen Width Adjustment Release Valve (2 positions) Rear Web Assembly (2 positions) 10 Screen Support Plate (2 positions) Screen Depth Adjuster 11 Front Web Assembly (2 positions) Screen Clamp Pneumatic Cylinder (2 positions) 12 Screen Guide Strip Screen Location Leaf Spring (3 positions) 13 Chase Rail Assembly Guide Shafts (2 positions) Right Hand Chase Rail Assembly 14 Left Hand Chase Rail Assembly Roller Counter Plate (4 positions) 15 Screen at Centre Opto Receiver (transmitter located in the right hand chase rail assembly) Screen Width Measuring Scale 16 Screen Clamp Assembly (8 positions) Chapter Issue Nov 07 Technical Reference Manual 15.1 ADJUSTABLE SCREEN MOUNT (ASM) OVERVIEW NOTE Squeegee drip tray removed for clarity View on Rear Underside of Squeegee Drip Tray Mechanism Figure 15-2 Auto Screen Loader Overview Item Description Item Description Squeegee Drip Tray Mechanism Squeegee Drip Tray Actuator Squeegee Drip Tray Drip Tray Retracted Sensor Auto Screen Loader Lever Auto Screen Loader Actuator Auto Screen Loader Actuator Retracted Sensor Auto Screen Loader Actuator Extended Sensor Screen Position Sensor 15.2 Technical Reference Manual Chapter Issue Nov 07 ADJUSTABLE SCREEN MOUNT (ASM) OVERVIEW There are three methods for housing and securing the stencil in the machine, the first is a fixed width system and is described in the Cast C Chase chapter, the second is also a fixed width system and is described in the Machined C Chase chapter, the third is an adjustable width system and is described in this chapter The ASM module provides a receptacle for the stencil, which is clamped in the correct position for printing operations The module width can be easily adjusted by an operator to accommodate stencils from the standard 29 inches square through to 12 inches square with 250mm belt support plates and board clamps fitted or 29 inches square through to 23 inches square with 500mm belt support plates and board clamps fitted The stencil image can be front or centre justified The pneumatic push buttons located on the inside of the front left and right hand web assemblies are operated, releasing all four web assemblies on the front and rear rail assembly guide shafts Releasing the web assemblies allows the user to adjust the position of the left and right hand chase rail assemblies, to accommodate for the appropriate size stencil The stencil is loaded from the front of the machine and slid into the machine along the top of stencil support plates Three stencil location leaf springs, located in the right hand chase rail assembly, ensure that the stencil is held in the correct location for printing, against the stencil guide strips on the left hand chase rail assembly The ASM is a floating assembly mounted on a bearing set The stencil is clamped in the ASM using pneumatically activated flaps that clamp the stencil to the stencil support plates The ASM is positioned to align the stencil to the correct printing position During printing the ASM is pneumatically clamped to the left and right printhead assemblies, to maintain the aligned position, by the stencil alignment module (for further details refer to the Screen Alignment Module chapter in this manual) A screen at centre, through beam opto (long throw type), sensor consisting of a transmitter and a receiver (Tx/Rx) is used to detect the presence of a stencil in the ASM There are three methods used for achieving correct position of the stencil within the ASM: • Screen Depth Adjuster • Auto Screen Loader • Semi-Auto Screen Loader NOTE Only one of the above items would be fitted to the machine at any one time Auto Screen Loader and Semi - Auto Screen Loader options are not available across the complete range of machines Chapter Issue Nov 07 Technical Reference Manual 15.3 ADJUSTABLE SCREEN MOUNT (ASM) OVERVIEW Screen Depth Adjuster The screen depth adjuster is set by the operator prior to loading the stencil The stencil is loaded manually into the chase until it reaches the stop at the end of the screen depth adjuster NOTE For further information on setting the screen depth adjuster, refer to Screen Depth Adjuster in the Adjustments and Settings section of this chapter Auto Screen Loader The auto screen loader (ASL) accurately positions the stencil/screen in the chase The asl is incorporated into the squeegee drip tray mechanism which is secured beneath the print carriage, therefore the drive is provided by the print carriage drive system Initially the stencil is manually loaded and the front printhead cover is closed When Load Screen is selected on the MMI, the asl is driven forward by the print carriage to locate the rear edge of the stencil Once located, the asl is driven further forward allowing the asl lever to clear the inner face of the rear frame of the stencil The lever is driven down and the print carriage is reversed pulling the stencil to the rear of the chase The lever is retracted and the stencil change mechanism is driven rearwards allowing the lever to clear the rear face of the stencil The lever is lowered and the print carriage is driven forwards, pushing the stencil to the correct position Once the stencil is registered in the correct position for printing, the lever is retracted and the stencil is secured in position Semi-Auto Screen Loader The semi-auto screen loader (S-ASL) positions the stencil after the operator has placed it in the chase The screen loader mechanism is incorporated into the squeegee drip tray mechanism which is secured beneath the print carriage, therefore the drive is provided by the print carriage drive system When Load Screen is selected on the MMI, the s-asl is driven forward by the print carriage to the correct load position The operator opens the printhead cover and loads a stencil into the machine until it abuts the s-asl lever This is the correct load position for the stencil If the stencil is not the correct one, the operator can unload it and replace it with the correct stencil The MMI posts a panel that questions the validity of the stencil after the cover is closed The unload sequence is instigated by the operator selecting Unload Screen The printhead cover is opened and the stencil is manually removed 15.4 Technical Reference Manual Chapter Issue Nov 07 Chapter Issue Nov 07 Technical Reference Manual USB NextMove ES (I/O Node 1) M36PL35 CAN Bus CAN_H CAN_L CAN GND M36 Machine Control Enclosure NOTE The breaks in the CAN Bus chain reflect that additional I/O Nodes may be fitted, refer to Machine Control chapter for the complete CAN Bus chain Motherboard PC N3SK3 N3SK2 N2SK2 N2SK3 0V DIG OUT CAN Out CAN In DIG OUT DIG OUT DIG IN DIG IN DIG IN DIG IN Print Carriage I/O Node Print Carriage CAN In CAN Out N3PL8 N3PL8 N3PL9 N3PL7 N3PL7 N3PL5 15 N2PL4 N2PL10 DIG IN 3 Main Machine I/O Node 13PL01 +12V Signal 0V - 16SK07 + 13SK19 +12V Mode 0V 13PL18 +12V Sig 0V Screen Clamps 16SOL07 Screen at Centre Through Beam Opto 13SE07 Screen Stop Actuator 9SOL29 Drip Tray Actuator 9SOL28 Drip Tray Actuator Retracted 13SE14 Screen Stop Actuator Extended 13SE12 Screen Stop Actuator Retracted 13SE13 Screen Position 13SE11 Tx Rx ADJUSTABLE SCREEN MOUNT (ASM) ELECTRICAL SCHEMATIC ELECTRICAL SCHEMATIC 15.5 ADJUSTABLE SCREEN MOUNT (ASM) ADJUSTMENTS AND SETTINGS ADJUSTMENTS AND SETTINGS Screen Depth Adjuster The stencil/screen depth adjuster has two scales as follows: Rear of Stencil to Front of Image Scale 650 REAR OF STENCIL TO FRONT OF IMAGE 622 26 600 550 24 508 CENTRE JUSTIFIED IMAGE SIZE 500 20 500 22 400 16 450 20 300 12 400 18 200 350 16 14 100 300 12 250 10 200 150 Centre Justified Image Size Scale The rear of stencil to front of image scale, marked on the top of the screen depth adjuster, can be used for either centre justified or front justified stencils The scale has both imperial and metric units as follows: • Metric - 150mm to 650mm • Imperial - inches to 26 inches When using this scale it is set to the rear of stencil to front of image value The figure below shows this measurement for both centre and front justified stencils Rear of Stencil to Front of Image Centre Justified Rear of Stencil to Front of Image Front Justified NOTE Rear of stencil to front of image is measured from the rear face of the screen frame to the front edge of the image Figure 15-3 Rear of Stencil to Front of Image Measurement 15.6 Technical Reference Manual Chapter Issue Nov 07 ADJUSTABLE SCREEN MOUNT (ASM) ADJUSTMENTS AND SETTINGS The centre justified image scale, marked on the side of the screen depth adjuster, can only be used for stencils that are 29 inches by 29 inches with a centre justified image For other stencil sizes with a centre justified image, the Rear of Stencil to Front of Image scale must be used When using the centre justified image scale, the stencil depth adjuster is set to the board width value The scale has both imperial and metric units as follows: • Metric - 0mm to 508mm • Imperial - inches to 20 inches To set the stencil depth adjuster, use the following procedure: Release the locking adjustment knob by turning it anti-clockwise Locking Adjustment Knob Measurement Guide TO CE NT RE End Stop RE AR OF ST FR EN ON CIL T JU OF ST IFIE IM D AG IM AG E E 65 SIZ E 20 ” 65 26 ” 24 60 24 ” ” 55 22 ” 50 20 ” 45 18 ” 40 16 ” 35 14 ” 30 12 ” 25 10 ” 20 8” Left Hand View on Screen Depth Adjuster 15 6” Set the measurement guide to either: a The rear of stencil to front of image value, on the top scale, for either centre or front justified stencils OR b The board width value, on the centre justified image size scale, for centre justified, 29 inch by 29 inch stencils only Turn the locking adjustment knob clockwise to secure the measurement guide Chapter Issue Nov 07 Technical Reference Manual 15.7 ADJUSTABLE SCREEN MOUNT (ASM) ADJUSTMENTS AND SETTINGS Auto Screen Loader Stencil Position Sensor Position a stencil in the machine so the rear stencil frame is beneath the screen position sensor + - Adjuster Test LED Screen Frame Screen Position Sensor Using a potentiometer trimming tool adjust the sensor sensitivity anticlockwise until the sensor test LED extinguishes Turn the sensor sensitivity clockwise until the sensor test LED illuminates Turn the sensor sensitivity clockwise a further half turn Move the rear stencil frame backwards and forwards under the sensor to ensure that the test LED is only activated by the stencil frame Test LED Off + Test LED On - + - Test LED Off + - Screen Frame Screen Sensor Behind Screen 15.8 Sensor Over Screen Frame Technical Reference Manual Sensor Over Screen Chapter Issue Nov 07 ADJUSTABLE SCREEN MOUNT (ASM) REPLACEMENT PROCEDURES REPLACEMENT PROCEDURES Chase Rail Assembly 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 WARNING COMPRESSED AIR COMPRESSED AIR SHOULD NEVER IMPINGE UPON THE BODY PORTS, PIPES, ETC MUST NEVER BE BLOCKED BY HAND BEFORE CONNECTING OR DISCONNECTING ANY PNEUMATIC COMPONENTS, ENSURE THE COMPRESSED AIR SUPPLY HAS BEEN DISSIPATED AND DISCONNECTED FROM THE MACHINE Removal Select Shut Down Select Continue Switch the mains isolator to OFF Disconnect the pneumatic supply to the machine Open the front printhead cover and centralise the chase rail assemblies Remove the two web assembly bracket securing screws Tilt the web bracket forward to expose the pneumatic pipes Chapter Issue Nov 07 Technical Reference Manual 15.9 ADJUSTABLE SCREEN MOUNT (ASM) REPLACEMENT PROCEDURES Disconnect the following pneumatic pipes shown in the graphic below: Disconnect from the underside of the chase rail width scale assembly the pneumatic pipe marked Rail Lock - Front 10 Uncouple from the tube clip the pneumatic supply pipe to the Rail Lock Front (disconnected in Step 8) 15.10 Technical Reference Manual Chapter Issue Nov 07 ADJUSTABLE SCREEN MOUNT (ASM) REPLACEMENT PROCEDURES 11 Gain access to the rear of the chase assembly Disconnect the pneumatic and electrical connectors to the rear web and remove the cable tie 12 At the rear web assembly, remove the three chase rail assembly securing bolts Chapter Issue Nov 07 Technical Reference Manual 15.11 ADJUSTABLE SCREEN MOUNT (ASM) REPLACEMENT PROCEDURES 13 At the rear face of the front web assembly, remove the two chase rail assembly securing bolts 14 At the front face of the rear web assembly, remove the two chase rail assembly securing bolts 15.12 Technical Reference Manual Chapter Issue Nov 07 ADJUSTABLE SCREEN MOUNT (ASM) REPLACEMENT PROCEDURES 15 Lift the rear end of the chase rail assembly clear of the rear web assembly Carefully feed the electrical connector and pneumatic pipe through the access hole in the rear web assembly 16 Replace the chase rail assembly onto the rear web assembly ensuring the electrical cable and pneumatic pipe are not trapped 17 From the front of the machine carefully lift out the chase rail assembly ensuring the electrical cable and pneumatic pipe does not snag on any part of the machine Fitment Carefully place the chase rail assembly onto the front and rear web assemblies from the front of the machine, ensuring the pneumatic pipes and electrical cables are not trapped under the chase rail assemblies At the rear web assembly, lift the end of the chase rail assembly and first, thread the electrical cable and subsequently the pneumatic pipe through the access hole in the web Loosely assemble the chase rail securing bolts (in seven positions) to the front and rear web assemblies Chapter Issue Nov 07 Technical Reference Manual 15.13 ADJUSTABLE SCREEN MOUNT (ASM) REPLACEMENT PROCEDURES At the rear web assembly, tighten the two horizontal chase rail securing bolts until the outer face of the chase rail just touches the web face NOTE The two rear web horizontal chase rail assembly securing bolts must not be fully tightened at this juncture otherwise, damage to the machine may occur Fully tighten the vertical chase rail securing bolt and subsequently complete the tightening of the two horizontal rear chase rail securing bolts 15.14 Technical Reference Manual Chapter Issue Nov 07 ADJUSTABLE SCREEN MOUNT (ASM) REPLACEMENT PROCEDURES Route the pneumatic supply pipe and electrical cable to the rear web connections Fit the loom and pipe to the appropriate connectors and secure the electrical loom with a cable tie At the front web assembly, fully tighten the four chase rail securing bolts Connect the Screen Clamps - Off and Screen Clamps - On pneumatic pipes to the quick release pneumatic connections shown below Chapter Issue Nov 07 Technical Reference Manual 15.15 ADJUSTABLE SCREEN MOUNT (ASM) REPLACEMENT PROCEDURES Thread the Rail Lock - Front pneumatic pipe through the slot in the chase rail width scale assembly and connect the pipe to the front web assembly pneumatic connection Ensure the pipe is secured into the pipe clip 10 Connect the rail lock pneumatic pipe to the push button valve on the web bracket assembly 11 Secure the web bracket assembly with the two securing screws 12 Reconnect the electrical and pneumatic power to the machine and check for air leaks 13 Press and hold the relevant push button valve and ensure the front and rear web assemblies release allowing the chase rail position to be adjusted Release the button valve and ensure the chase rail is now clamped in position 14 Power up the machine and press the System button to initialise 15 Select Maintenance 15.16 Technical Reference Manual Chapter Issue Nov 07 ADJUSTABLE SCREEN MOUNT (ASM) REPLACEMENT PROCEDURES 16 Select Diagnostics 17 Use Next or Previous to highlight Screen Change 18 Select Select Module 19 Use Next or Previous to highlight Toggle Screen Clamps 20 Select Run Diagnost repeatedly and ensure the flap assemblies extend and retract correctly 21 Select Exit 22 Select Exit 23 Select Back Screen at Centre Sensor To replace the screen at centre sensor transmitter or receiver the appropriate chase rail assembly is to be removed from the machine (see Chase Rail Assembly - Removal procedure earlier in this section) Place the chase rail assembly on a level surface with the stencil support plate uppermost Unscrew the nine M3 countersunk stencil support plate retaining screws and remove the plate Remove the screen at centre M3 button headed retaining screw from the centre of the sensor body Release the sensor loom from the ‘P’ clip fitted adjacent to the pneumatic cylinder pulley Chapter Issue Nov 07 Technical Reference Manual 15.17 ADJUSTABLE SCREEN MOUNT (ASM) REPLACEMENT PROCEDURES Remove and discard the sensor loom Screen at Centre Sensor 'P' Clip View on Underside of Chase Rail Assembly (Stencil Support Plate Removed) Fit the replacement sensor to the chase rail assembly and secure with the M3 button headed screw Fit the ‘P’ clip to the sensor loom and secure with the pan headed screw Ensure the loom runs beneath the cable assembly Feed the loom through the channel of the chase rail assembly Refit the stencil support plate and secure with the nine M3 countersunk retaining screws To refit the chase rail assembly to the machine (see Chase Rail Assembly Fitment procedure earlier in this section 15.18 Technical Reference Manual Chapter Issue Nov 07 ADJUSTABLE SCREEN MOUNT (ASM) REPLACEMENT PROCEDURES Cable Assembly To replace the cable assembly the appropriate chase rail assembly is to be removed from the machine (see Chase Rail Assembly - Removal procedure earlier in this section) Removal Place the chase rail assembly on a level surface with the stencil support plate uppermost Unscrew the nine M3 countersunk stencil support plate retaining screws and remove the plate Turn the chase rail assembly through 90° Unscrew the stencil guide strip M3 pan head retaining screws and remove the stencil guides for access Rotate the chase rail assembly until the flap assemblies are uppermost Loosen the flap cover bracket retaining screws and remove the four flap covers Lever the cable retainers from the topmost cable pulleys Unscrew the two cylinder cover securing screws and remove the cover to gain access to the cable retainer bracket Remove the two pan headed retaining screws, the bracket and release the cable end Cable Retainer Bracket Pulley Retaining Pin View on Chase Rail Assembly Release the cylinder pulley retaining pin from the pulley block and remove the pulley from the block releasing the cable assembly Rotate the chase rail assembly through 180° Chapter Issue Nov 07 Technical Reference Manual 15.19 ADJUSTABLE SCREEN MOUNT (ASM) REPLACEMENT PROCEDURES Remove the cable end from the retaining slot in the chase rail assembly Cable Retainer Pulley (in three positions) Cable End View on Underside of Chase Rail Assembly Un-thread the cable assembly from the cable pulleys and cylinder pulley Fitment Fit the end of the new cable assembly to the retaining slot in the chase rail assembly Thread the cable assembly around the four sets of three cable pulleys and route the cable around the cylinder pulley Thread the cable assembly loosely around the pulley and refit the pulley to the pulley block and secure with the retaining pin Clamp the cable end to the chase rail assembly with the cable retainer bracket and secure with two M4 pan head screws Refit the cylinder cover Clip the cable retainers over the topmost pulleys Fit the flap cover brackets over the flap assemblies and secure with M3 screws Using M3 pan head retaining screws refit the stencil guide strips to the chase rail assembly Position the stencil support plate on the base of the chase rail assembly and secure with nine M3 countersunk screws To refit the chase rail assembly to the machine (see Chase Rail Assembly Fitment procedure earlier in this section 15.20 Technical Reference Manual Chapter Issue Nov 07 ADJUSTABLE SCREEN MOUNT (ASM) CALIBRATIONS CALIBRATIONS Chase to Table Level NOTE This procedure requires the use of a DEK Test Plate, DEK part number 113693 If a DEK Test Plate is required, contact DEK Customer Support before commencing The chase to table level is checked by measuring down to points on the rising table surface from the DEK Test Plate which simulates a screen fitted in the chase A datum reading is taken from the centre hole E, the range of readings must not exceed 0.15mm of the datum Adjustable Screen Mount Depth Micrometer Test Plate Rising Table View on Front of Machine Figure 15-4 Chase to Table Level Setting B A A .mm B .mm C .mm E D .mm C D E .mm Figure 15-5 Test Plate Recordings Chapter Issue Nov 07 Technical Reference Manual 15.21 ADJUSTABLE SCREEN MOUNT (ASM) CALIBRATIONS Chase to Table Level Adjustment If adjustment is required, the bearing roller at the appropriate corner may be adjusted to obtain the correct depth range NOTE Be careful that this does not result in one corner of the chase ‘floating’, ie load not being spread evenly over the four support rollers Using an appropriate sized C spanner, slacken the locking nut Roller Counter Plate View on Front Left or Rear Right Printhead Roller Bearing Assembly Chase Clamp Locking Nut View on Roller Bearing Assembly (counter plate removed for clarity) Using a slim 24mm spanner, raise or lower the roller bearing assembly within the printhead assembly to achieve the required chase to table level setting Tighten the locking nut Recheck the chase to table level setting 15.22 Technical Reference Manual Chapter Issue Nov 07 ADJUSTABLE SCREEN MOUNT (ASM) CALIBRATIONS On the left hand printhead, ensure a 0.25mm shim/feeler gauge fits between the roller counter plate and the chase clamp Chase Clamp Securing Screws Roller Counter Plate View on Front Left or Rear Right Printhead If adjustment is necessary, slacken the two securing screws and adjust the height of the chase clamp to achieve the dimension in Step Tighten the two securing screws Repeat Steps - for the chase clamp on the right hand printhead Associated Calibrations and Adjustments The settings shown below should be checked following adjustments to the chase to table level • Chase Clamp Regulator Setting (Pneumatic Module) • Vision Height (Camera System Module) • Vision System Calibration (Camera System Module): Stage - Calibrate Vision Stage - Calibrate Offset Chapter Issue Nov 07 Technical Reference Manual 15.23 ADJUSTABLE SCREEN MOUNT (ASM) CALIBRATIONS 15.24 Technical Reference Manual Chapter Issue Nov 07 ... Extended 13SE12 Screen Stop Actuator Retracted 13SE13 Screen Position 13SE11 Tx Rx ADJUSTABLE SCREEN MOUNT (ASM) ELECTRICAL SCHEMATIC ELECTRICAL SCHEMATIC 15.5 ADJUSTABLE SCREEN MOUNT (ASM) ADJUSTMENTS... Test LED Off + - Screen Frame Screen Sensor Behind Screen 15.8 Sensor Over Screen Frame Technical Reference Manual Sensor Over Screen Chapter Issue Nov 07 ADJUSTABLE SCREEN MOUNT (ASM) REPLACEMENT... Manual 15.7 ADJUSTABLE SCREEN MOUNT (ASM) ADJUSTMENTS AND SETTINGS Auto Screen Loader Stencil Position Sensor Position a stencil in the machine so the rear stencil frame is beneath the screen position