印刷机DEK刮刀使用手册

CHAPTER 9 SQUEEGEE MODULE

OVERVIEW

Item Description Item Description

1Squeegee Printhead Mechanism5Squeegee Drip Tray

2Rear Squeegee Stepper Motor6Rear Squeegee

3Front Squeegee7Print Carriage

4Squeegee Drip Tray Mechanism8Front Squeegee Stepper Motor

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The squeegee mechanism is driven backwards and forwards across the screen

by the print carriage.

The squeegee printhead mechanism incorporates two stepper motors to drive

the two squeegees independently down onto the screen when a print stroke is

required. During the rearward stroke, the front squeegee is in contact with the

screen performing a rear print stroke. During the forward stroke, the rear

squeegee is in contact with the screen performing a forward print stroke.

The pressure being applied during the print stroke is measured by a strain

gauge bridge (located in the spring beam assembly of the squeegee mecha-

nism) and if necessary, a correction to the pressure is made by the software.

Figure 9-1 Squeegee Sensor Locations

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Squeegee Drip Tray

Figure 9-2 Squeegee Drip Tray Overview

The squeegee drip tray mechanism secures to the underneath of the print carriage. The drip tray pneumatic actuator extends the drip tray below the squeegees to prevent print medium from dripping onto the screen during print carriage initialisation or auto screen loading.

The squeegee drip tray mechanism is also used to accommodate the auto screen loader mechanism, refer to the Adjustable Screen Mount (ASM) or Cast C Chase Module chapters for more information.

The drip tray retracted sensor is used by software to check that the pneumatic actuator has retracted the drip tray before lowering the squeegees.

NOTE

With the squeegee drip tray and the screen depth adjuster fitted, the ASM must be set to 29 inches and cannot accommodate smaller screen sizes.

ELECTRICAL SCHEMATIC

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REPLACEMENT PROCEDURES ProFlow to Squeegees

Instances may occur when the machine is required to print using the squeegee module configuration. The following procedure details how to revert the machine from ProFlow use to the squeegee configuration:Removing ProFlow 1.Select

.

2.Select

Diagnostics .

e Next or Previous to highlight ProFlow .

4.Select Select Module .

5.Ensure Home ProFlow is highlighted.

6.Select Run Diagnost .

7.Select Exit .

8.Select Exit .

9.Select

Back .

10.

.

11.Select

.

12.Select

Back .

13.Select

Shut Down and switch the mains isolator to OFF .