| 摘要 |
PURPOSE: To improve the efficiency in use by fitting a power application part in a pressure-resistant case and setting respective clearances between respective through-holes, in which a driving shaft and an operation lever of a drive motor run through the outside of the pressure-resistant case and the driving shaft and operation lever to be an explosion-proof stricture in the width and depth required fro the pressure-resistant explosion-proof. CONSTITUTION: When output shafts 21 of drive motors 2 and 6 are rotated, an input shaft 45 running through a storage case 28 is rotated through a transmission belt 46. Following the rotation, a hammer 76 is rotated to typewrite on a printing paper 30 by means of character molds 73 of a typewriter wheel 7 and print the weight of LPG. Simultaneously a ratchet 64 gets in mesh with a ratchet wheel 62 and is revolved to feed the printing paper 30 held by feed rollers 60 and 61 out of a feed outlet 35. At that time, drive shafts of drive motors 2 and 6 are inserted into through-holes formed on a pressure-resistant case 4, and the width and depth of the clearances between through-holes and drive shafts are set in compliance with the requirement for the pressure-resistant explosion-proofness, by which a printer is allowed to be set in a flammable atmosphere. |
