| 摘要 |
PURPOSE:To keep both spring rollers out of way when loading a negative and a sensitized material, by providing a stepped part which becomes low by 1 step like a staircase, on the front upper part of a printing frame body, and automatically positioning both the rollers on the stepped part, before operation of a printer is started, or when it is not used. CONSTITUTION:When a horizontal pin 16 of the lower end of a lifting lever 15 is positioned at the front end of a lower driven sprocket 8b, both spring rollers 20, 22 are positioned on a stepped part 5 of a housing 1. Subsequently, when an endless chain 10 starts to run toward the rear, both the rollers 20, 22 lift together with the lifting lever 15 until the horizontal pin 16 reaches the upper end of an upper driven sprocket 8. Both the rollers 20, 22 start to run toward the rear on a light transmission plate 2, as the lower end of the lifting lever 15 is supported by a chain receiving lever 11 through the endless chain 10. When the roller 22 goes backward, an airtight sheet is extended onto the light transmission plate 2, and covers a negative and a sensitized material on the light transmission plate 2. Before the operation is started, a cover 25 and the light transmission plate 2 are on the same plane, therefore, both the rollers do not stand in the way when loading the negative and the sensitized material. |
