265ProFlow - 第43页

TECHNI CAL REFEREN CE ADJUS TMEN TS AND SE TTINGS Chapter Issue 8 Dec 02 ProFlow Manual 1.39 ADJUSTMENTS AND SETTINGS Cassette Low Sensor The cassette low senso r position can be changed in order t o minimize pri nt mate…

TECHNICAL REFERENCE

POSITIONING

1.38 ProFlow Manual Chapter Issue 8 Dec 02

Contact Height Contact height is when the ProFlow wipers are just in contact with the stencil,

but with no force exerted (zero pressure).

NOTE

For setting up information refer to Contact Height Position Set Up in Calibrations

section of this chapter.

ProFlow should normally be left in this position when the unit is not in use, this

prevents material leakage, contact with the air/drying out and also prevents

material contamination.

Figure 1-26 ProFlow in the Contact Height Position

Print Height Print height is when the system pressure is being applied to ProFlow whilst

positioned on the stencil, (system pressure is dependent upon the board file

programmed). Piston pressure is also applied (during the print stroke) at this

position.

Figure 1-27 ProFlow in the Print Height Position

ProFlow Lowered

in Contact with Screen

Downstop in Contact

with Print Carriage

Zero Pressure

on Screen

ProFlow Lowered to

Print Height (System Pressure)

NOTE

Piston Pressure is applied

during the print cycle,

ie when the unit moves across

the stencil apertures.

TECHNICAL REFERENCE

ADJUSTMENTS AND SETTINGS

Chapter Issue 8 Dec 02 ProFlow Manual 1.39

ADJUSTMENTS AND SETTINGS

Cassette Low

Sensor

The cassette low sensor position can be changed in order to minimize print

material wastage. A graduated scale (millimetre) on the actuator cylinder body

provides a reference point for accurate sensor positioning, (Cassette Low

Sensor Adjustment figure refers). The sensor is moved up or down by loosen-

ing the securing screw, (1.5mm Allen key).

The factory setting for the sensor is set to 20mm on the graduated scale. Each

millimetre movement is equivalent to approximately 43gms of print material

usage.

WARNING

SOLDER PASTE AND SOLVENTS. WHEN USING OR HANDLING ANY SOLDER

PASTE OR SOLVENT FORMULATION THE MANUFACTURERS’ RECOMMEND

SAFETY PRECAUTIONS MUST BE STRICTLY ADHERED TO.

WARNING

PROTECTIVE CLOTHING. APPROVED PROTECTIVE CLOTHING SHOULD BE

WORN BY SOLDER PASTE AND SOLVENT HANDLERS AT ALL TIMES TO

ELIMINATE FUME INHALATION, EYE CONTACT, SKIN CONTACT AND

INGESTION.

The following procedure should be carried out when print material wastage is

excessive.

1. Gain access to the ProFlow unit by opening the machine cover.

2. Lift off the ProFlow pressure mechanism cover.

Cassette Option 3. Noting the present position of the sensor against the graduated marker,

loosen the sensor using a 1.5mm Allen key.

4. With each graduation on the graduation scale being equivalent to approxi-

mately 43gms of print material, move the sensor down by single graduations

until the optimum print material usage position is obtained, (Cassette Low

Sensor Adjustment figure refers).

5. Carefully re-tighten the sensor securing screw.

NOTE

To prevent damage to the sensor, do not overtighten grub screw.

6. Replace the pressure mechanism cover.

7. Close the machine cover.

Rechargeable

Transfer Head

Option

8. When using a rechargeable transfer head and paste low sensor activation

is required at the mid diaphragm point the reed sensor can be inverted so

that a higher sensor initiation can be achieved. (In this position the sensor

cable is at the bottom of the sensor.)

TECHNICAL REFERENCE

ADJUSTMENTS AND SETTINGS

1.40 ProFlow Manual Chapter Issue 8 Dec 02

Figure 1-28 Cassette Low Sensor Adjustment

Software Pressure

Adjustment

The software controlled regulator can be instructed to supply and maintain

pneumatic pressure to the piston crosshead within the range of 0.0 bar to 4 bar,

or no pressure at all.

Software controlled piston pressure has four settings:

• Print Paste Pressure

• Knead Paste Pressure

• Idle Paste Pressure

• No Pressure

NOTE

For ProFlow cassette option - ensure that the

cable of the sensor is configured to the top.

Rechargeable transfer head option - sensor may

be inverted (cable to the bottom) if paste low

activation is required at mid way point.

Securing

Screw

Graduated Scale (1mm increments)

Piston Crosshead

Sensor

20 (mm) Factory Setting

1mm Graduation 43gms Print

Material Usage