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2 STINGER, A GUIDE TO ADHESIVE DOT DISPENSING 2.2 INTRODUCTION GUIDE TO ADHESIVE DOT DISPENSING STINGER 03/2021 13 1 2 3 1 Wiper Target 3 Nozzle 2 Waste Container (pot) 2.2.3 Sensors and Motors 1 2 3 4 Stinger Unit Under…

2 STINGER, A GUIDE TO ADHESIVE DOT DISPENSING

2.2 INTRODUCTION

12 GUIDE TO ADHESIVE DOT DISPENSING STINGER 03/2021

1 Level Sensor 7 Nozzle

2 Syringe 8 Auger Motor

3 Pneumatic Connector 9 Auger

4 Electrical Connector 10 Laser

5 ‘C’ Clamp 11 Auger Motor Pulley

6 Z Axis Motor 12 Auger Clamp Screw

2.2.1.5 Nozzles

At the bottom of the auger valve a nozzle is fitted. Nozzles come in different sizes to suit the pro-

cess. They are identified by body colour: Purple tip i.d.= 0.51mm (inside diameter at the tip), Blue =

0.41mm tip i.d, Orange = 0.33mm tip i.d. and Red = 0.25 tip i.d.

2.2.2 Purge Station

The purge station houses a waste container, which collects the waste purged adhesive. On the lid

of the station is a wiper target; this target allows the syringe nozzle to be wiped after a purge opera-

tion. The purge operation is carried out during product set up/product changeover or, if a nozzle or

a syringe have been replaced during a batch print. A purge operation is used to ensure that the ad-

hesive is free running prior to it being applied to the product. If a nozzle, or the syringe have been

changed, the tubing, nozzle and syringe may contain air and the initial flow of adhesive may have

air pockets. The adhesive must be purged into the purge station.

NOTE

If a purge station isn’t used, the adhesive can be programmed to purge on an area of the board.

2 STINGER, A GUIDE TO ADHESIVE DOT DISPENSING

2.2 INTRODUCTION

GUIDE TO ADHESIVE DOT DISPENSING STINGER 03/2021 13

1 Wiper Target 3 Nozzle

2 Waste Container (pot)

2.2.3 Sensors and Motors

Stinger Unit Underneath Front View

1 Capacitive Level Sensor 3 Auger Drive Motor

2 Z-Axis Motor 4 Laser Surface Height Detector

2.2.4 Capacitive Level Sensor

The capacitive level sensor detects the change in capacitance of the surrounding near field area.

When a full cartridge is fitted, the capacitive field remains constant. As the adhesive in the syringe

is depleted, there is no change in capacitance until it reaches the point where the sensor is located.

The capacitive field changes and this change is indicated on the printer’s display interface. The

cartridge is changed and the level sensor is recalibrated to show a full condition.

2 STINGER, A GUIDE TO ADHESIVE DOT DISPENSING

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14 GUIDE TO ADHESIVE DOT DISPENSING STINGER 03/2021

2.2.5 Laser Surface Height Detector

The laser is used to detect the point where the upper surface of the product is; this data is used to

calibrate the relative dispense height of the nozzle. The unit is automatically adjusted in software

and carries out its own calibration cycle as part of the set up routine. The LED’s on the front of the

unit can be ignored and the yellow button must not be adjusted.

2.2.6 Auger Motor

The auger motor drives the screw in the auger valve; the number of turns is set by a feed para-

meter in the software. The screw provides control over the amount of adhesive to be deposited and

‘works’ the adhesive to pre-condition it. This ensures that at the correct height, the nozzle deposits

a precise amount of adhesive to the product surface and flow is maintained throughout the deposit

cycle.

2.2.7 Z Axis Motor

The z axis motor drives the unit to this calibrated location. An end stop dowel provides a stall point

for the motor upper limit (see graphic). Refer to the Calibration section of this manual for details on

setting the calibrated heights for deposit and idle heights.

1 Yellow Button and LEDs 2 End Stop