US3604851A - Receiving device for code combinations for a teleprinter of the start-stop type - Google Patents

Receiving device for code combinations for a teleprinter of the start-stop type Download PDF

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Publication number
US3604851A
US3604851A US832616A US3604851DA US3604851A US 3604851 A US3604851 A US 3604851A US 832616 A US832616 A US 832616A US 3604851D A US3604851D A US 3604851DA US 3604851 A US3604851 A US 3604851A
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United States
Prior art keywords
state
code
character
signal
shaft
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Expired - Lifetime
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US832616A
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English (en)
Inventor
Bruno Sandrone
Giuseppe Ricciardi
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Olivetti SpA
TIM SpA
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Olivetti SpA
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Publication date
Application filed by Olivetti SpA filed Critical Olivetti SpA
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Publication of US3604851A publication Critical patent/US3604851A/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L17/00—Apparatus or local circuits for transmitting or receiving codes wherein each character is represented by the same number of equal-length code elements, e.g. Baudot code
    • H04L17/16—Apparatus or circuits at the receiving end
    • H04L17/30—Apparatus or circuits at the receiving end using electric or electronic translation

Definitions

  • Known devices comprise a printing mechanism adapted to be actuated cyclically to print a received character, a register adapted to store from time to time a code combination corresponding to the character to control a series of code electromagnets, a start electromagnet for the printing mechanism and delay means for controlling the clearing of the register.
  • the lever 94 is adapted to cooperate by means of a lug 97 with one end 98 of the connecting rod 69 and is connected by a pin and slot to an armature 99 turning on the shaft 53.
  • the armature 99 is attracted by a release electromagnet 102 normally kept energized, through an amplifying circuit l00,known per se, by the reset output D of a flipflop 103 (FIG. 2) described more fully hereinafter.
  • timing device for commanding the transfer of the code combinations received by the electromagnets 49 to the code bars 26, this timing device comprising a disc 127 fixed to the driving shaft 2 and provided at its periphery with two plates 128 and 129 of ferromagnetic material which are fixed to the disc 127 in two angular positions such as to define two arcs, one of which exceeds the other substantially by an angular portion equal to that covered by the shaft 2 in which the clutches 8 cannot be closed or engaged.
  • a signal generator constituted by a magnetic detector 131, the primary of which is fed by a source of direct current 132 (FIG. 2) to create the magnetic field on a core 133.
  • a signal is induced in the secondary of the detector 131 whenever one of the plates 128, 129 (FIG. 3) comes into correspondence with the core 133.
  • the line of the secondary is connected to a circuit 134 (FIG. 2) adapted to transform the two signals into electric pulses of square form of the same-sign and to amplify them and send them to gating inputs A and B, for resetting and setting, respectively, of the flip-flop 103.
  • the binary counter 44 sends to the decoding circuit 46 four signals corresponding in binary code to the number of pulses transmitted by the oscillator 38 on the line
  • the decoding circuit 46 receives the binary number nine, it sends a signal on the line 47, bringing back to their initial state the binary counter 44 and the start flip-flop 41 which latter, in turn, through the medium of the line 39, causes the oscillator 38 to stop.
  • This signal moreover commands the transfer of the code bits present in the register 36 to the storage register 42, as a result of which the eight electromagnets 49,49 are then selectively deenergized in accordance with the corresponding code units received.
  • the flip-flop 103 Since the input B is now enabled, the flip-flop 103 is brought back to its initial state, as a result of which the reset output D causes the electromagnet 102 to be reenergized and, via the line D-F, inhibits the input B, while the set output C brings the storage register 42 back to its initial state, thus reenergizing the electromagnets 49 -49 which have been selectively deenergized.
  • the storage register 42 is thus ready to receive a new code combination.
  • the lobe 82 (FIG. 4) of the, cam "L9 moreover continues to cause the lever 71 to turn anticlockwise, so that the lug 73 draws the lever 76 downward fully together with the connecting rod 69.
  • the two universal bars 64 and 66 (FIG. 3) are therefore turned clockwise until they respectively encounter the teeth 62 of the sliders 54 remaining in the upper position and the teeth 63 of the sliders 54 which have been moved to the bottom.
  • the sliders 54 are thus moved selectively to the right or to the left together with the sliders 57.
  • the sliders 57 position the corresponding code bars 26 (FIG.
  • delay means controlled by said mechanism to reset said control circuit to the first state with a predetermined delay with respect to the actuation of the start electromagnet, said control circuit being arranged to clear said register on reverting to the first state.
  • a device comprising a shift register adapted to be conditioned by a received start signal to receive the signals of the code combination in series under the control of said character ready signal, said storing register being arranged to be filled in parallel upon being cleared by said shifi register, said character ready signal providing means being adapted to block the further reception of signals in said shift register upon said storage register being filled.
  • control circuit further comprises a flip-flop coupled to said bistable circuit and adapted to be brought into a first state by said character ready signal and to be brought into a second state in consequence of the changeover of said bistable circuit to its second state, in the second state said flip-flop being adapted to pass on the character ready signal to said bistable circuit.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Toys (AREA)
  • Mechanical Operated Clutches (AREA)
  • Pinball Game Machines (AREA)
US832616A 1968-06-12 1969-06-12 Receiving device for code combinations for a teleprinter of the start-stop type Expired - Lifetime US3604851A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT5201468 1968-06-12

Publications (1)

Publication Number Publication Date
US3604851A true US3604851A (en) 1971-09-14

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ID=11276204

Family Applications (1)

Application Number Title Priority Date Filing Date
US832616A Expired - Lifetime US3604851A (en) 1968-06-12 1969-06-12 Receiving device for code combinations for a teleprinter of the start-stop type

Country Status (3)

Country Link
US (1) US3604851A (enrdf_load_stackoverflow)
FR (1) FR1600687A (enrdf_load_stackoverflow)
GB (1) GB1230729A (enrdf_load_stackoverflow)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3236940A (en) * 1962-05-24 1966-02-22 Chaskin Dimmick Corp Teletype code control circuits
US3450837A (en) * 1966-07-25 1969-06-17 Olivetti & Co Spa Code translating device for a start-stop teleprinter

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3236940A (en) * 1962-05-24 1966-02-22 Chaskin Dimmick Corp Teletype code control circuits
US3450837A (en) * 1966-07-25 1969-06-17 Olivetti & Co Spa Code translating device for a start-stop teleprinter

Also Published As

Publication number Publication date
DE1929982B2 (de) 1977-04-21
GB1230729A (enrdf_load_stackoverflow) 1971-05-05
FR1600687A (enrdf_load_stackoverflow) 1970-07-27
DE1929982A1 (de) 1969-12-18

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