A Staffelwalze is a cylinder, on which nine teeth of different lengths are applied. It serves certain mechanical calculating machines as drive.

Operational principle

, The adjustable gear wheel illustrated above the Staffelwalze is connected with the Einstellwerk of the calculating machine. If the number zero is stopped, this gear wheel at the lefthand side of the Staffelwalze, if nine one adjusted, is accordingly at the right edge.

The number of decisive teeth of the turning Staffelwalze is proportional to the adjusted number. If the zero are adjusted, then the transmission gear wheel is not turned, since at the lefthand side of the Staffelwalze no tooth is. Is adjusted the 5, five teeth intervene, the remaining four are too short, in order to intervene.

Historical development

The first calculating machine according to the relay roller principle developed Gottfried William Leibniz (1646-1716). The basic principle presented he 1673 the Royal Society in London. The machine developed from it was almost in working condition, i.e., on it some problem examples were counted for functional test.

The development at the first calculating machine in working condition ministers of the Philipp cock (1739-1790) began in the year 1770. It was finished 1774 and presented to the public. Altogether produced cock and its brother-in-law shoemakers 8 to 12 machines.

In knowledge of a short description of the Hahn machine the Hessian Johann Helfreich Mueller (1746-1830) developed a similar calculating machine. Its construction exhibited however some improvements. Thus it possessed a bell, which sounded during overflow, and she could be reequipped for counting in non decimal number systems. Beside the construction Mueller was concerned with machine counting. It compared this with counting on feather/spring and paper and came to the conclusion that the machine counting was more rational.

Probably the first in series manufactured relay roller machine was manufactured by Charles Xavier Thomas (1785-1870) starting from 1820. Until 1878 was produced in its Manufaktur approximately 1500 machines.

The relay roller principle stood with the industrially manufactured calculating machines in competition to the sprocket wheel principle. Also after the Second World War calculating machines of both drive principles were manufactured, for example the relay roller bag calculating machine Curta designed heart-strongly by Curt (from 1946 to 1972).

Literature

• Henry The Odhner History - at Illustrated Chronicle OF "“A Machine ton of COUNTs on"”. Gothenburg 1951

Articles in category "Staffelwalze"

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