Abstract: Provided are an emission material and an organic EL device including the emission material and having high emission efficiency and a long lifetime. An emission material represented by the following general formula (1) or the like, and an organic EL device including the emission material in a light emitting layer: wherein A1 represents CR1, C or N, each ring E represents a heterocycle represented by formula (1a), X1 represents a group represented by, for example, O, S, Se, or N-L1-(Ar1)e; and a, b, c, and d represent 0 or 1, provided that, when R1 or L1 does not form a fused ring with an adjacent aromatic ring, a+b+c+d=1 is not satisfied.

Abstract: A printer includes a printing unit having a platen roller, a power unit including a stepping motor and a gear train, a cutting unit provided at a further downstream of a forward direction than the platen roller to cut a paper at a predetermined position, the forward direction in which the paper printed by the printing unit is fed by the forward rotation of the platen roller, and a control unit to control the driving of the stepping motor and the operation of the cutting unit. The control circuit controls the platen roller to rotate forward and place a certain portion of the paper at a predetermined position of the cutting unit on standby for a predetermined time, then controls the cutting unit to cut the paper, and after the cutting, controls the platen roller to rotate forward by a minimal number of steps necessary to remove backlash.

Abstract: A printer includes a printing unit having a platen roller, a power unit including a stepping motor and a gear train, a cutting unit provided at a further downstream of a forward direction than the platen roller to cut a paper at a predetermined position, the forward direction in which the paper printed by the printing unit is fed by the forward rotation of the platen roller, and a control unit to control the driving of the stepping motor and the operation of the cutting unit. The control circuit controls the platen roller to rotate forward and place a certain portion of the paper at a predetermined position of the cutting unit on standby for a predetermined time, then controls the cutting unit to cut the paper, and after the cutting, controls the platen roller to rotate forward by a minimal number of steps necessary to remove backlash.