1OM-1505-004_w - 第75页
1OM-1505 1-20 4. Screen Printing Procedure : Chap.1 0906-001 4. Screen Printing Procedure The procedure for printing the PCB is described briefly. PCB Input and Positioning 4.1 PEC Recognition 4.2 Printing 4.3 PCB Output …
1OM-1505
3. Mechanism for Screen Printing : Chap.1
1-19
3.5 Items Required for Printing
•
Solder Paste
Solder Paste
F1A22
This is creamy solder made from mixture of solder powder and flux solvent.
Note
(a) Carefully read the specications of the solder paste and the precautions on
handling it for the correct use.
(b) Do not mix new solder paste with old one.
•
Squeegee
Solder Paste
Squeegee
Stencil
PCB
F1A23
The squeegee is used to apply solder paste to the PCB through the pores of the
stencil mesh, forming printed patterns on the PCB.
•
Stencil
F1A24
The stencil is used to print solder paste on the PCB through the pores of the stencil
mesh.
0906-001
1OM-1505
1-20
4. Screen Printing Procedure : Chap.1
0906-001
4. Screen Printing Procedure
The procedure for printing the PCB is described briefly.
PCB Input and Positioning 4.1
PEC Recognition 4.2
Printing 4.3
PCB Output 4.4
Printing Flow Chart F1A25
1OM-1505
4. Screen Printing Procedure : Chap.1
1-210906-001
4.1 PCB Transfer and Positioning
PCB
PCB Detection Sensor on
Input Side
PCB Clamp
Table
PCB Stopper on
Input Side
PCB Warpage
Top Holder
PEC Recognition Camera
PCB Detection Sensor
PCB Stopper
PCB Backup Base
F1A26
(1) The PCB transferred from the input machine to the L conveyor is further
carried by the belt until it touches the PCB stopper on the input side. When
the PCB detection photosensor on the input side detects the PCB, the L
conveyor stops running.
(2) When the PEC recognition camera is moved to the position appropriate for
the PEC recognition size, the "PCB Stopper" is lowered.
(3) When the PCB stopper has moved down, the L conveyor is driven.
At this time, the PCB warpage top holder moves down.
(4) When the PCB is transferred to the PEC positioning section and pressed
against the "PCB Stopper" and the PCB is recognized using the "PCB
Detection Sensor", the L-conveyor and the conveyor in the PCB positioning
section, are stopped.
(5) The PCB backup base in the PCB positioning section
moves up and clamps
the PCB.
(6) When the actions in the PCB positioning section are completed, the PCB
warpage top holder and the PCB stopper move up.