Infinity EX Print Carriage Module.pdf - 第12页

INFINITY EX PRINT CARRIAGE M ODULE ADJUS TMENTS AN D SETTIN GS 9.12 Technical Reference Manual C hapter I ssue 2 Aug 02 ADJUSTMEN TS AND SETTINGS Hom e Sens or Adjustment The print carriage has to trav el to its home pos…

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PRINT CARRIAGE MODULE

POSITIONING

Chapter Issue 2 Aug 02 Technical Reference Manual 9.11

POSITIONING

Print Carriage

Positioning

The print carriage mechanism moves the printhead assembly along the print

stroke length. The stroke length is automatically set when the board width

parameter is set.

When the initialization routine starts the print carriage moves to its home

position sensor (rear of the machine). When the sensor change has been detected

the motor reverses its direction at slow speed until the sensor clears, at this point

the motor stops. This is defined as its zero count position for the encoder to

position the carriage.

All positioning of the print carriage is referenced from the home position and

calculated in the machine software, taking into account :

• Board width

• Front and rear print limits

• Screen adaptors

• Front rail justification

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PRINT CARRIAGE MODULE

ADJUSTMENTS AND SETTINGS

9.12 Technical Reference Manual Chapter Issue 2 Aug 02

ADJUSTMENTS AND SETTINGS

Home Sensor

Adjustment

The print carriage has to travel to its home position upon machine initialization.

1. Ensure the machine is switched off.

2. Raise the front and rear machine top covers.

3. Position the sensor laterally to ensure the vane does not foul the Hall effect

switch as it passes through it.

4. Move the vane to a central position along its adjustment slot.

5. Switch on the machine and select Diagnostics. Select the Print Carriage

module.

6. Press the Home Print Carriage diagnostic. The print carriage moves into

the Hall effect and then reverses at slow speed until the vane just exits the

sensor where it parks.

7. Measure the distance between the rear face of the O ring support of the front

rail and the face of the front squeegee holder, (Print Carriage Home Setting

figure refers), the correct setting is 514 mm +/- 0.5 mm. Adjust the vane on

the print carriage and repeat step 6 until this measurement is achieved.

This completes the print carriage sensor set-up.

NOTE

Although the servo motor is fitted with an encoder the index pulse is not used in

the homing sequence. To adjust the home position the vane must simply be

moved the amount needed to correct the error.

Figure 9-8 Print Carriage Home Setting

Rear Rail

Front Rail

Front Squeegee Mounting Print Carriage Motor Print Carriage

Home Sensor

Printhead Plan View (Covers Removed)

514mm +/- 0.5mm

(Front Rail Justified)

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PRINT CARRIAGE MODULE

REPLACEMENT PROCEDURES

Chapter Issue 2 Aug 02 Technical Reference Manual 9.13

REPLACEMENT PROCEDURES

Left Hand Timing

Belt

1. In Print Carriage Diagnostics, select Drive Carriage to Front Position. Power

down the machine.

2. Raise the front and rear printhead covers.

3. Loosen the two pulley support bracket securing screws located at the front

left hand corner of the machine printhead casting.

NOTE

Take note of the orientation of the belt clamp.

4. At the belt clamp on the left hand side of the print carriage, remove the drag

chain cable tie and release the belt clamp securing screws. Remove and

discard the belt.

5. Fit the end of the replacement belt into the rear end of the belt clamp, tighten

sufficiently to hold the belt.