88242361-04-01 Vol 1 DEK TQ TECHNICAL REFERENCE (1).pdfPDFA.pdf - 第38页
4 MACHINE OVERVIEW 4.1 MODULE OVERVIEWS 38 TECHNICAL REFERENCE MANUAL DEK TQ 04/2021 4.1.6.1 Stencil Alignment The stencil alignment module enables adjustment of the chase to achieve optimum stencil to board alignment pr…
4 MACHINE OVERVIEW
4.1 MODULE OVERVIEWS
TECHNICAL REFERENCE MANUAL DEK TQ 04/2021 37
4.1.6 Stencil Chase
The stencil chase is the receptacle for the stencil. The chase clamps the stencil securely in place.
The automatic stencil loader, mounted on the print carriage, loads the stencil to the correct position
in the Y axis.
The stencil can be adjusted to accommodate various size of stencils.
4 MACHINE OVERVIEW
4.1 MODULE OVERVIEWS
38 TECHNICAL REFERENCE MANUAL DEK TQ 04/2021
4.1.6.1 Stencil Alignment
The stencil alignment module enables adjustment of the chase to achieve optimum stencil to board
alignment prior to the print stroke. Actuators move the chase in the X, Y and theta planes.
The stencil chase floats on three roller bearings and is connected to 3 actuator motors that move
the chase. Once aligned, the chase is clamped to prevent movement.
1
2
3
4
6
5
1 Right Y Actuator 4 X Actuator
2 Front Right Roller Ball and Chase
Clamp
5 Left Y Actuator
3 Front Left Roller Ball and Chase
Clamp
6 Rear Roller Ball and Chase
Clamp
4 MACHINE OVERVIEW
4.1 MODULE OVERVIEWS
TECHNICAL REFERENCE MANUAL DEK TQ 04/2021 39
4.1.6.2 Auto Coplanarity
Auto coplanarity aligns the chase with the tops of the centre section of the front and rear transport
conveyors. This ensures that when the board is presented to the stencil for the print stroke, they
are level.
This is achieved by using two lasers (1) mounted left and right of the print carriage. Four measure-
ments are taken on the stencil directly above the transport conveyors. The stencil is removed and
four measurements are taken in the same place on the tops of the transport conveyors. The meas-
urements are compared and the chase is levelled to the conveyors using motors (2 and 3) left and
right at the front of the chase. The chase is pivoted from the rear of the chase (4) which also sets
the height of the chase.
1
2
3
4
4.1.7 Under Stencil Cleaner (USC)
The USC module automatically cleans the underside of the stencil, reducing the build-up of print
medium.
The module consists of:
●
Under Stencil Cleaner
●
Solvent Tank
●
Vacuum Pump
●
Vacuum Filtration Unit
The vacuum filtration unit aids in removing excess print medium from the underside of the stencil
and fumes created by the solvent/print medium.
The USC traverses in the Y direction using the Y drive linear motor. The Y drive is also shared by
the camera carriage.