| 摘要 |
A frame has a first portion turnable about a turning axis, and a second portion mounted for straight-line movement. An optical price-indicating system of the scale includes a translucent dial having a plurality of price scales and movable in dependence upon a weight on the scale. An objective is provided at one and a light source at the other side of the dial, and the objective is mounted on the second portion of the frame and has an optical axis parallel to the turning axis. A stationary projecting screen is provided, and a pair of mirrors are also provided, being respectively mounted on the first and second portions for directing a light beam from the objective onto the screen. The mirrors are telescopically shiftable relative to one another in the direction in which the light beam travels from one to the other of the mirrors, and one of the mirrors is mounted on the optical axis and the other mirror is mounted on the turning axis. |
