Thermal activation device and printer

摘要

A thermal activation device includes a platen lock mechanism ( 19 ) for locking a platen roller ( 12 ) and a thermal activation head ( 11 ) into press contact with each other, the platen lock mechanism ( 19 ) including lock arms ( 32 a and 32 b) provided to be rotatable and engaged with a platen unit ( 18 ), and a compression coil spring ( 24 ) which urges the lock arms ( 32 a and 32 b) so as to bring the lock arms ( 32 a and 32 b) into engagement with the platen roller ( 18 ). The plate lock mechanism ( 19 ) includes lock pins ( 33 ) provided in the platen unit ( 18 ), and engagement grooves ( 37 ) which are provided in the lock arms ( 32 a and 32 b) and with which the lock pins ( 33 ) are engaged. Moreover, in the platen lock mechanism ( 19 ), in a state where the thermal activation head ( 11 ) is in press contact with the platen roller ( 12 ), an axis of the lock pins ( 33 ) is provided at a position farther than a position of a rotation center of the platen roller ( 12 ) with respect to a rotation center of the lock arms ( 32 a and 32 b).