| 摘要 |
The present invention relates to a dual rail screen printer comprising a printed circuit board (PCB), a main body frame (1), and a conveyor provided on an alignment unit (2) of the main body frame (1), wherein the PCB is fed by means of the conveyor, solder is deposited on the PCB as a pattern formed on a mask by means of a squeegee, and the PCB has solder applied and printed thereon so that the PCB is discharged and conveyed to the rear end of the conveyor. The conveyor comprises: a plurality of laterally symmetrical in-feed standby units (100 and 100') provided to receive an in-fed PCB and transport same to a mask which is enlarged or reduced laterally in accordance with the size of the PCB; a plurality of laterally symmetrical solder print units (200 and 200') which apply solder on the PCB having been conveyed after the PCB has remained at the in-feed standby units (100 and 100'), discharge the PCB, and which are laterally enlarged or reduced about the center thereof according to the size of the PCB; and a plurality of laterally symmetrical discharge standby units (300 and 300') which receive the conveyed PCB having the solder applied thereon by the solder print units (200 and 200'), are discharged and put on standby, and which are laterally enlarged or reduced according to the size of the PCB. |
