为了尽快改变邮政通信的落后面貌,我厂广大职工,积极开展技术革新活动,在原有的WY—3型信函过戳机的基础上,又研制成功WY—4型机械式信函过戳机。本机利用信函本身在外力作用下触动日戳控制机构,实现自动过戳、计数等机械动作。经使用证明:机器工作稳定可靠,结构简 In order to change the backwardness of postal communication as soon as possible, a large number of staff and workers of our factory actively carry out technological innovation activities. On the basis of the original WY-3 type letter tucking machine, we successfully developed the WY-4 type mechanical letter tucking machine. This machine uses the letter itself to touch the date stamp control mechanism under the action of external force to realize automatic mechanical actions such as stamping and counting. Proved by the use: The machine is stable and reliable, simple structure