88242361-04-01 Vol 1 DEK TQ TECHNICAL REFERENCE (1).pdfPDFA.pdf - 第141页
9 PASTE DISPENSER SYSTEM 9.1 OVERVIEW TECHNICAL REFERENCE MANUAL DEK TQ 04/2021 141 5 4 3 2 1 Paste Dispenser System - View On Rear 1 Paste Dispenser Pneumatic Solenoid 4 Paste Dispenser Home Sensor 2 Paste Dispenser Z A…
9 PASTE DISPENSER SYSTEM
9.1 OVERVIEW
140 TECHNICAL REFERENCE MANUAL DEK TQ 04/2021
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Paste Dispenser Jar Overview - View On Front
1 Paste Jar Dispenser Mounting
Plate
10 Anti-Drip Nozzle
2 Linear Bearings and Guide 11 Paste Piston
3 Electrical and Pneumatic
Connectors
12 Paste Jar
4 Jar Dispense Actuator 13 Actuator Cover
5 Paste Jar Low Level Reed Switch 14 Paste Dispenser Drip Tray
6 Paste Jar Support 15 Paste Dispense Pressure Gauge
7 Nozzle Support 16 Paste Dispense Regulator
8 ‘O’ Ring Seal 17 Jar Paste Regulator Assembly
9 Paste Transfer Tube 18 X Axis Linear Drive
9 PASTE DISPENSER SYSTEM
9.1 OVERVIEW
TECHNICAL REFERENCE MANUAL DEK TQ 04/2021 141
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Paste Dispenser System - View On Rear
1 Paste Dispenser Pneumatic
Solenoid
4 Paste Dispenser Home Sensor
2 Paste Dispenser Z Axis Reed
Switch
5 Paste Dispenser Home Sensor
Vane
3 Paste Dispenser Z Axis Cylinder
9.1.1 Paste Dispenser
The paste dispenser is driven in the X direction by a stepper motor. This enables accurate position-
ing of paste onto the stencil in the X direction. The paste dispenser is mounted vertically and is
pneumatically driven to the paste dispensing height in the Z direction only when it is over the sten-
cil. There are two inter-changeable dispenser types:
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Paste Cartridge
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Paste Jar
9.1.1.1 Paste Cartridge
The paste dispenser is designed to accommodate cartridges up to 1kg in size. The paste is dis-
pensed by applying pneumatic pressure to the paste cartridge.
The paste dispenser is supplied with an extra pneumatic cartridge cap and paste cartridge anti-drip
nozzles to help with a fast changeover when the cartridge needs replenishment.
9 PASTE DISPENSER SYSTEM
9.1 OVERVIEW
142 TECHNICAL REFERENCE MANUAL DEK TQ 04/2021
9.1.1.2 Paste Jar
Paste is dispensed by applying pneumatic pressure to the base of the paste jar, driving the jar
downwards over the paste jar piston assembly, forcing the paste out of the jar, into the paste trans-
fer tube and through the anti-drip nozzle on to the stencil.
A paste jar release switch, activated through the HMI software, applies pneumatic pressure to the
opposite end of the paste jar pneumatic cylinder, removing pressure from the base of the paste jar.
Once fully released, the user can easily remove the piston and nozzle to replace the paste jar.
9.1.2 Paste Dispenser Regulator
The pneumatic pressure used to dispense the paste is variable depending on the viscosity of the
print medium being used and the flow of the print medium required. The regulator can be adjusted
to increase or decrease the pneumatic pressure applied to either the cartridge or jar dispenser.
9.1.3 Sensors
9.1.3.1 Home Position Sensor
The paste dispenser mechanism is fitted with a through beam optical sensor which detects a vane
fitted to the dispenser carriage. This is utilised as the home position sensor.
9.1.3.2 Cartridge Low Level Sensor
The cartridge paste dispenser uses a proximity sensor to detect the level of paste.
The paste low level sensor is designed to alert the operator when the paste level reaches low level.
The paste cartridge is checked when in the home position.
9.1.3.3 Paste Jar Low Level Sensor
The paste jar dispenser is fitted with a reed switch on the pneumatic actuator. Once the piston in-
side the actuator reaches a certain position, this activates the reed switch providing a paste low
level indication.