| 摘要 |
<p>PURPOSE:To form a simple structure at a low cost by applying a conductive material on the side surface of one side of a machine glazed paper sheet, and by providing a residual quantity detection contact on a residual quantity detection point, and a reference contact which is slid and is in contact with the conductive material on the point of inner circumferential surface compared to the residual quantity detection contact, and a continuity detection means between both contacts. CONSTITUTION:As long as the roll diameter of a sensitized paper sheet 14 is larger than the diameter of a residual detection position A, a residual quantity detection contact 22 which is slid and is in contact at the residual quantity detection point A, and residual quantity detection contacts 24, 26 which are slid and are in contact on the inner peripheral side compared thereto, are electrically connected and are thus electrified with a reference contact 28 through a conductive material 20, and three, light emitting diodes 32, 34, 36 correspondent to three residual quantity detection contacts, are all lighted. As long as a region is smaller than the diameter of the residual quantity detection point A, and is larger than a residual detection point B, the connection between the residual quantity detection contact 22 and the conductive material 20 is cut off, and only the light emitting diode 32 is turned out. It is thus detected that the residual quantity of the sensitized paper sheet 14 is reduced by the quantity smaller than the residual quantity detection point A. In the same manner, the level of the residual quantity is detected by the stepwise turning out of the light emitting diodes 34, 36.</p> |
