A numbering and imprinting machine comprising: an impression cylinder which holds and conveys a sheet; a stamp cylinder which is disposed in contact with said impression cylinder, and prints a stamp on the sheet held by said impression cylinder; a first printing cylinder which is disposed downstream of a printing position of said stamp cylinder in a direction in which the sheet is conveyed, and in contact with said impression cylinder, and performs first printing on the sheet held by said impression cylinder; a second printing cylinder which is disposed downstream of a printing position of said first printing cylinder in the direction in which the sheet is conveyed, and in contact with said impression cylinder, and performs second printing on the sheet held by said impression cylinder, at least one of the first printing and the second printing including number printing; and a moving inker including a first ink supply device which supplies first ink onto said first printing cylinder, and a second ink supply device which supplies second ink onto said second printing cylinder, said moving inker being movable between an actuation position at which said first ink supply device and said second ink supply device supply the first ink and the second ink, respectively, onto said first printing cylinder and said second printing cylinder, respectively, and a retraction position at which said first ink supply device and said second ink supply device separate from said first printing cylinder and said second printing cylinder, respectively, wherein a first space is formed between said moving inker, which is set at the retraction position, and said first and second printing cylinders so as to permit entrance of an operator thereinto, and a second space is formed between said stamp cylinder and said first printing cylinder to permit the operator who has entered the first space to access said impression cylinder, characterized in that the machine comprises a plate-shaped support member which is positioned at a shielding position at which said support member covers said first printing cylinder against the first space and prevents the operator who has entered the first space from touching said first printing cylinder when said moving inker is moved to the retraction position. an impression cylinder which holds and conveys a sheet; a stamp cylinder which is disposed in contact with said impression cylinder, and prints a stamp on the sheet held by said impression cylinder; a first printing cylinder which is disposed downstream of a printing position of said stamp cylinder in a direction in which the sheet is conveyed, and in contact with said impression cylinder, and performs first printing on the sheet held by said impression cylinder; a second printing cylinder which is disposed downstream of a printing position of said first printing cylinder in the direction in which the sheet is conveyed, and in contact with said impression cylinder, and performs second printing on the sheet held by said impression cylinder, at least one of the first printing and the second printing including number printing; and a moving inker including a first ink supply device which supplies first ink onto said first printing cylinder, and a second ink supply device which supplies second ink onto said second printing cylinder, said moving inker being movable between an actuation position at which said first ink supply device and said second ink supply device supply the first ink and the second ink, respectively, onto said first printing cylinder and said second printing cylinder, respectively, and a retraction position at which said first ink supply device and said second ink supply device separate from said first printing cylinder and said second printing cylinder, respectively, wherein a first space is formed between said moving inker, which is set at the retraction position, and said first and second printing cylinders so as to permit entrance of an operator thereinto, and a second space is formed between said stamp cylinder and said first printing cylinder to permit the operator who has entered the first space to access said impression cylinder, characterized in that the machine comprises a plate-shaped support member which is positioned at a shielding position at which said support member covers said first printing cylinder against the first space and prevents the operator who has entered the first space from touching said first printing cylinder when said moving inker is moved to the retraction position.