To prevent printing pressure from becoming different by a method wherein a type is brought in uniform pressure contact with a printing surface even though a printing width is wide.

A swinging rotary mechanism 20 of a printing head is provided in a printer wherein a swinging body 57 equipped with a printing head on its tip is arranged on a passage wherein a material 24 to be printed travels, a type 27 is intermittently made contact or separate by swinging by rotating the printing head 28 to a printing surface of the material 24 to be printed, and printing is carried out per each specific interval. In the swinging rotary mechanism 20, eccentric pins 55, 56 are provided to rotary plates 53, 54 which are vertically disposed in an array and rotated reversely by being linked, and the swinging body 57 is, in a freely swingable manner, supported by equipping the upper eccentric pin 55 to the upper side of the swinging body 57. The lower eccentric pin 56 is, in a freely shiftable manner, provided inside a guide hole 69 provided to the lower side of the swinging body 57. When the rotary plates 53, 54 are rotated one turn, the printing head 28 is in contact with and separated from the printing surface of the material 24 to be printed in an arcuated circulating locus. Thereby, printing can be distinctly carried out by uniform printing pressure without an irregularity over a broad width on the material 24 to be printed.