| 摘要 |
An automatic device for dialing pulses such as telephone numbers. A revolving drum that includes a plurality of discs having on their periphery a series of groups of irregularities programmed in accordance with a determined code are selectively brought opposite a rapidly acting micro-switch inserted in the telephone line. An electric motor rotates the discs while simultaneously the telephone apparatus with which the micro-switch is incorporated is short-circuited. The micro-switch is fitted on a cursor having multiple stable positions on a shaft parallel to the shaft of the drum. The cursor is fitted with a sensing shoe sliding over extensions in the programmed discs. The discs bearing programmed irregularities for operating the micro-switch are constituted by means of independent circular sections which are fitted on the drum secured against radial and tangential forces. The drum is constituted by means of the combination of two different classes of discs, rigid and flexible. A cam on the drum produces the locking of the drum in a stable position when the apparatus is at rest and the automatic closing of a switch in the feed circuit of the motor during a complete revolution of the drum. Between every two groups of irregularities of the same disc there are fitted some separating pieces capable of bringing about the stopping of the drum and a telephonic commutation in accordance with which the telephone ceases to be short-circuited during the time that the stopping of the drum lasts. The shaft along which the cursor moves has the possibility of turning through a certain angle between two check-pieces and is acted upon by a spring that endeavors to turn it in a clockwise direction. A radial lever operates to form a block of telephonic commutation so that when the apparatus is sending pulses the telephone is short-circuited and when the block is in a situation of repose or of momentary stopping between two emissions of pulses, produced by the pieces that are inserted between the groups of programming sectors, then the telephone is in service.
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