| 摘要 |
PURPOSE:To prevent respective number wheels in reset-to-zero state from acting blindly, by attaching an unfigured wheel and a cam plate to a common shaft and detaining elastically the cam plate by a curved elastic spring part, which is formed on the unfigured wheel, to stop the shaft. CONSTITUTION:When a common shaft 3 is rotated to arrange number wheels 5a-5d so that respective numbers of these wheels are reset to zero, a cam plate 19 fixed to the shaft 3 is rotated together with the shaft 3 as one body. A detaining projection part at the tip of the cam plate 19 is inscribed to a curved elastic spring part of an unfigured wheel 15 and is rotated; and when all of number wheels 5a-5d are reset to zero, the detaining part at the tip of the cam plate 19 gets over a projecting part of the unfigured wheel 15 and is engaged with a detaining recessed part. Consequently, number wheels 5a-5d do not act blindly unless a strong turning force is applied to the shaft 3. |
