untitled SCREEN ALIGNMENT MODULE OVERVIEW CHAPTER 18 SCREEN ALIGNMENT MODULE OVERVIEW Item Description Item Description 1 Chase Clamp (2 positions) 6 Chase Clamp Regulator 2 Roller Counter Plate (4 po.
SCREEN ALIGNMENT MODULE OVERVIEW CHAPTER 18 SCREEN ALIGNMENT MODULE OVERVIEW 2 A Machine Front Plan View of Screen Alignment System View on Arrow A Item Description Item Description Chase Clamp (2 positions) Chase Clamp Regulator Roller Counter Plate (4 positions) Y Actuator X Front Actuator Adjustable Screen Mount (ASM) X Rear Actuator Right Hand Printhead Assembly Left Hand Printhead Assembly Chapter Issue Jan 07 Technical Reference Manual 18.1 SCREEN ALIGNMENT MODULE OVERVIEW The screen alignment system is one of the most sensitive and critical components of machine accuracy The alignment system consists of three stepper motor driven linear actuators in contact with the chase (adjustable screen mount) which is a free floating mechanism sprung against the three actuators The actuators are configured in a three point contact arrangement and are controlled and driven independently to give maximum flexibility in screen movement The screen is aligned to the board each machine cycle unless non-vision is selected An algorithm determined by image capture is calculated in software, this sets the direction and distance that each actuator must move to align the screen to the board Once correctly aligned the chase is clamped by two pneumatic chase clamps, to the left and right printhead assemblies, so that the alignment is maintained throughout the rest of the print cycle A spring fitted between the actuator and the chase provides an anti-backlash mechanism to ensure accurate positioning is always achieved All positioning of the screen actuators is referenced from the home position and calculated in the machine software The screen actuators only home during initialisation, which can be from power-up or exiting diagnostics When homed the stepper motor retracts the actuator plunger until the motor stalls The stepper motor reverses direction and drives the actuator plunger out 20mm For information on the chase clamp solenoid and the chase clamp regulator refer to the Pneumatics Chapter 18.2 Technical Reference Manual Chapter Issue Jan 07 Chapter Issue Jan 07 Technical Reference Manual USB Step Dual Stepper X3 Step Step M36PL25 M36PL24 SK1 c2 c4 c6 c8 SK3 a2 a4 a6 a8 M36PL23 SK1 a2 a4 a6 a8 NextMove ES (I/O Node 1) M36PL35 CAN Bus CAN_H CAN_L CAN GND SK5 c26 SK3 c28 a30 SK1 c30 c26 SK1 c28 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 Dir Step Dir Step Dir Step Dual Stepper X1 M36 Machine Control Enclosure CAN In N2SK2 CAN Out Main Machine I/O Node N2SK3 14 0V N2PL4 16SK31 DIG OUT 8SK05 8PL05 8SK04 8PL04 8SK03 8PL03 M M M Chase Clamps 16SOL31B Y Actuator 9M07 X Rear Actuator 9M06 X Forward Actuator 9M05 SCREEN ALIGNMENT MODULE ELECTRICAL SCHEMATIC ELECTRICAL SCHEMATIC 18.3 SCREEN ALIGNMENT MODULE TEST CYCLES TEST CYCLES Carry out the following procedure to access the Test Cycles: Select Maintenance Select Test Cycles The following options are displayed: Dry Align Test • Dry Align Test • Accuracy Test • Data Logging On/Off Selecting this function initiates the machine to run Dry Alignment accuracy tests With data logging set to On, all test data is output to a Test.log file With data logging set to Off, all test data is output to a Test.dat file Accuracy Test Selecting this function commences a series of tests: • Operation of the vision camera • Movement of the camera • Repeatabiltiy of the rising table and rail system • Operation of the chase clamps With data logging set to On, all test data is output to an atest.dat file that can be imported into a Lotus spreadsheet to assist in determining the cause of location accuracy problems associated with camera positioning, chase clamping and table movement Pressing the Stop Run key at any time during the sequence of tests terminates the cycle on completion of the respective test and return to the previous menu To recommence the test cycle select Accuracy Test, this starts the tests at Test again and not where the test cycle was previously terminated 18.4 Technical Reference Manual Chapter Issue Jan 07 SCREEN ALIGNMENT MODULE TEST CYCLES Data Logging On/ Selecting this function enables/disables data logging from within the main menu without the necessity of entering the diagnostics mode Off With data logging enabled, the following data files are created on the PC hard drive giving information on certain machine functions: • Camera.dat • Fiducial.dat • Inspect.dat • Pressure.dat • Ptest.dat • Screen.dat Camera.dat This file is created when cycle camera system is running in diagnostics and records fiducial locations for each camera cycle Fiducial.dat This file is created at the end of the calibration function and records fiducial detection data for the 50 locations Inspect.dat This file is created by SPC and records 2Di paste results in a raw data format Pressure.dat This file is created in run mode and records squeegee pressures during the print stroke Ptest.dat This file is created when calibrating the squeegee reference height with pressure hardware enabled The file records the amount of steps the squeegee is driven down with the pressure achieved Screen.dat This file is created when cycle alignment system is running in diagnostics and records positional deviations of the screen fiducial Chapter Issue Jan 07 Technical Reference Manual 18.5 SCREEN ALIGNMENT MODULE TEST CYCLES 18.6 Technical Reference Manual Chapter Issue Jan 07 .. .SCREEN ALIGNMENT MODULE OVERVIEW The screen alignment system is one of the most sensitive and critical components of machine accuracy The alignment system consists of... Actuator 9M07 X Rear Actuator 9M06 X Forward Actuator 9M05 SCREEN ALIGNMENT MODULE ELECTRICAL SCHEMATIC ELECTRICAL SCHEMATIC 18.3 SCREEN ALIGNMENT MODULE TEST CYCLES TEST CYCLES Carry out the following... test cycle was previously terminated 18.4 Technical Reference Manual Chapter Issue Jan 07 SCREEN ALIGNMENT MODULE TEST CYCLES Data Logging On/ Selecting this function enables/disables data logging