| 摘要 |
A calculator of the type having digit or counter wheels which can be manually actuated for addition and subtraction. The calculator is in a relatively thin case or housing with opposite sides so constructed that access can be had to the digit or counter wheels from either side of the housing to actuate them with a stylus. The counter is hinged within a check book so that it can be readily moved to expose either side for making calculations. A digit or number is put in as an input by rotating any digit wheel with a stylus. Thus, a movement by the stylus on one side causes the machine to add and the same type or kind of movement on the opposite side causes the machine to subtract, the digit wheel being rotated in the opposite direction. The transfer means between digit wheels comprises idler wheels. Each idler wheel meshes with a digit wheel that is driven by it. Each idler wheel is driven by a digit wheel; each digit wheel has a single tooth positioned to effect the one-step transfer to an idler wheel when the digit wheel makes a complete revolution. The teeth on the idler wheels and the digit wheels are relatively displaced axially with respect to their hubs, alternate digit wheels and idler wheels being inverted to permit closer spacing with each idler wheel driving the next digit wheel but not meshing with the preceding digit wheel.
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