Patent ID: 8499688

Claim:
A screen printer that is coupled to an upstream side of an electronic component loader which mounts electronic components on a substrate so as to constitute an electronic component mounting line, and that prints electronic component bonding paste to the substrate, the printer comprising: two screen printing sections that each have a mask plate including a pattern hole and a squeegee moving mechanism which lets a squeegee slidably move over the mask plate supplied with paste and that are arranged symmetrically with respect to a center line of the electronic component mounting line when viewed in plane; a substrate positioning section that is provided in each of the two screen printing sections and that positions and holds the substrate at a print position for the screen printing section of interest; and a substrate conveyance section that is disposed between the two screen printing sections and that conveys the substrate in a direction of conveyance of a substrate, wherein the substrate conveyance section has a plurality of substrate conveyance paths that convey the substrate, and wherein the plurality of substrate conveyance paths include a conveyance bypass for sending a substrate to a downstream machine without passing through any of the two screen printing sections.