Patent ID: 8919248

Claim:
A screen printing machine comprising: a substrate conveying and supporting device configured to convey a circuit substrate in a right and left direction and position and support the circuit substrate at a printing position; a printing device configured to carry out screen printing on the circuit substrate supported by the substrate conveying and supporting device; a printer main body configured to hold the substrate conveying and supporting device and the printing device, the printer main body including: a main body portion and a support table portion which are provided independently of each other, and the main body portion is supported by the support table portion so as to be movable forward; a stopper device configured to define a forward-movement end position of the main body portion with respect to the support table portion; and a lift-preventing device configured to prevent at least a rear portion of the main body portion from being lifted upward from the support table portion, wherein: in a state in which the main body portion has been moved to the forward-movement end position defined by the stopper device with respect to the support table portion, a center of gravity of the main body portion is located at a rear of a front end of a part of the support table portion, which part supports the main body portion, and in a state in which the main body portion has been moved to the forward-movement end position defined by the stopper device with respect to the support table portion, a center of gravity of a combination of the main body portion and the support table portion is located at a rear of a front end of a part of the support table portion, which is held in contact with the floor surface.