CONTROL OF STOPPING POSITION OF PRINTING HEAD

PURPOSE:To prevent skewing of a paper from occurring due to clamping of a glued part of the paper between the tip of a printing head and a platen, by preventing the printing head from being stopped at the glued part in the bottom of an envelope. CONSTITUTION:Where a paper to be printed is an envelope 10, an allowable range (u) of stoppage of a printing head 2 based on the paper width (w) of the envelope is set in a controller. When printing is performed outside the allowable range (u) while moving a printing head 2 rightward during printing, a command for stopping the head 2 is given after moving the head 2 to a position (c) outside the paper width (w). The allowable range (u) of stoppage is given as a value obtained by subtracting a stoppage inhibited range (m) from the paper width (w). The stoppage inhibited range (m) is given as e+d+g, where (e) is the width of a glued part at the bottom of the envelope, (d) is the approach run distance by which the head 2 is moved before it is actually stopped after the command for stopping the head is given, and (g) is an allowable width set by taking into account the scattering of the width (f) of the tip of the head 2, the approach run distance (d), etc. The stoppage inhibited range (m) is preset in the controller.