Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . * controlled by paUets of the escapement / / attachedto the permanently magnetised armature m vibrated bv alter-nating currents through the electro-magnets op. The electro-magnet r, controlling the printing escapement, is in the samecireuit, its core having an extension ir. and^ being surroundedby a non-ma^etic material, it is not operated bv the rapidlychanging
Knight's American mechanical dictionary : a description of tools, instruments, machines, processes and engineering, history of inventions, general technological vocabulary ; and digest of mechanical appliances in science and the arts . * controlled by paUets of the escapement / / attachedto the permanently magnetised armature m vibrated bv alter-nating currents through the electro-magnets op. The electro-magnet r, controlling the printing escapement, is in the samecireuit, its core having an extension ir. and^ being surroundedby a non-ma^etic material, it is not operated bv the rapidlychanging currents passing through op, which work the tvpe-wheel escapement: but when the key connected with auv par-tk-iilar letter is struck, the circuit* is cla*ed, sufficientmag-netL«m accumulates in the core ir to attract the armature r,releasing the arm y carrying the paper-roUer s. and allowing acrank-pin on the shaft of the wbevl I. turned by a train ofmechanism from the spring-barrel a, to depress that arm ofthe lever and throw the feed-roller up against the tvpe. Anderss printing-tel^j^raph (Fig. 3957).The type-wheel and printing mechanism are driven by %spring acting on the shaft of the wheel o. As coireots alt^^- Fig. Pietpss Printing-Teltgraph. Anderss Printin^-TfUgraph. nating in direction ape passed through the electro-magnet hand polariied magnet c. the armature d of the former is at-tracted and held to its poles, while the armature e of the polar-ized magnet c is caused to vibrate laterally between the polesof this magnet, releasing one by one the teeth of the scape-wheel / on the type-wheel shaft from contact with a pallet onthe arm s of the rock-shaft k, which is operated by the vibra-tions of the armature. An intermittent motion is thus im-parted to the type-wheel, advancing it one letter at each elec-tric pulsation: and when, by touching the proper key, theseare su.^pended, the spring k dn>ws back the am atnre d, thepress mechanism is released, and an in.
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Keywords: ., bookcentury1800, booksubjectin, booksubjectmechanicalengineering
