US3742299A - Speed detector - Google Patents

Speed detector Download PDF

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Publication number
US3742299A
US3742299A US00288572A US3742299DA US3742299A US 3742299 A US3742299 A US 3742299A US 00288572 A US00288572 A US 00288572A US 3742299D A US3742299D A US 3742299DA US 3742299 A US3742299 A US 3742299A
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US
United States
Prior art keywords
flip
flop
counter
gate
output
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US00288572A
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English (en)
Inventor
A Gane
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Alcatel Lucent NV
Original Assignee
International Standard Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by International Standard Electric Corp filed Critical International Standard Electric Corp
Application granted granted Critical
Publication of US3742299A publication Critical patent/US3742299A/en
Assigned to ALCATEL N.V., DE LAIRESSESTRAAT 153, 1075 HK AMSTERDAM, THE NETHERLANDS, A CORP OF THE NETHERLANDS reassignment ALCATEL N.V., DE LAIRESSESTRAAT 153, 1075 HK AMSTERDAM, THE NETHERLANDS, A CORP OF THE NETHERLANDS ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: INTERNATIONAL STANDARD ELECTRIC CORPORATION, A CORP OF DE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
    • B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
    • B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism

Definitions

  • a telegraphic printer will print with an un- [521 Cl 317/5 303/21 gag 3 wanted orientation or in an undesired way if printing is ⁇ 51 1 In Cl 02 7/00 permitted during start up of the mechanism.
  • the device [58] Fie'ld 173 disclosed herein may thus be employed to inhibit print- 324/186; 317/5, 19; 303/21 CE, 21C, 2 CF; 307/233; 340/263 ing until the mechanism gets up to speed.
  • This invention relates to a speed sensing arrangement for a printing telegraph machine or the like.
  • a printing telegraph machine incorporates a print wheel or cylinder which rotates continuously, at least during printing.
  • the invention provides one way of ensuring that the motor is at full speed before any printing action can take place.
  • an on-speed sensing arrangement for a printing telegraph machine which machine incorporates a continuously rotating print-wheel, including a toothed index wheel which is arranged to rotate in synchronism with the print-wheel, a sensor for producing an impulse each time a tooth passes it, and an electronic frequency sensing device which is set in operation by each impulse of a first train of alternate impulses from the sensor, and halted by each impulse of a second train of alternate impulses from the sensor, the frequency sensing device producing an inhibiting signal to hold the printing mechanism of the machine inoperative if it reaches a predetermined state before being halted by an impulse of said second train.
  • a motor 1 drives a print-wheel 2 mounted on a shaft 3. Also on the shaft, or geared to it so as to rotate in synchronism, is a toothed index wheel 4.
  • a sensor 5, here represented as a magnetic pick-up senses the passage of each tooth as the wheel 2 revolves and produces a train of corresponding impulses. The train of impulses are applied over line 7 to an electronic frequency sensing device 8 which produces an inhibiting signal on line 9 as long as the input frequency on line 7 is less than a desired value.
  • a variety of electronic frequency sensing devices can be devised but one which is readily resettable and can have as fine a resolution as desired includes in combination a toggle 10 used as a scale-of-two circuit to which the input impulses are applied, a counting circuit 1l, an oscillator 12 which supplies impulses to one input of an AND gate 13, an output toggle 14 set by an output from the last stage of the counter, or from the combined (ORed) output from a particular combination of stages, and cleared by way of AND gate 15. Alternate impulses on line 7 turn on the A side of toggle 10. This, applied to the other input of gate 13, opens the gate and allows the impulses from oscillator 12 to drive the counter 11.
  • the counter will reach its predetermined count before a succeeding impulse on line 7 returns on the B side of toggle l0, and will set toggle 14 to its A side, thus producing the inhibiting signal on line 9, and at the same time it will inhibit gate 15 so that the subsequent turning on of the B side of toggle 10 will not interrupt the inhibit signal on line 9 by clearing the toggle 14.
  • the B side of toggle 10 will be turned on just before counter 11 reaches its predetermined count, and will clear both counter 11 and toggle 14. After that, the counter will not be able to reach its predetermined count and set toggle 14 until the motor is shut down in the next idle period, assuming, of course, that the machine is in good running order so that nothing causes serious variation of the speed of the wheels 2 and 4.
  • a control system comprising: a member movable in a predetermined direction; means fixed adjacent said member to produce output pulses at a pulse repetition frequency (PRF) directly proportional to the velocity of said member; a first flip-flop connected from said means in a manner to change states each time said means produces one of said output pulses thereof, said first flip-flop having A and B sides; a burst oscillator; a pulse counter; a second flip-flop having A and B sides; a first AND gate; and a second AND gate, said first AND gate being connected from said first flip-flop A side and from said oscillator to the input of said counter, the B side of said first flip-flop being connected to said counter to reset the same, said second AND gate being connected from the output of said counter and from the B side of said first flip-flop to the B side of said second flip-flop, the output of said counter being connected to the input of the A side of said second flip-flop, the two levels of output of the A side of said second flip-flop being respectively representative of whether the speed of said
  • said means including a ferromagnetic pick-up.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Control Of Stepping Motors (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
  • Accessory Devices And Overall Control Thereof (AREA)
US00288572A 1971-10-07 1972-09-13 Speed detector Expired - Lifetime US3742299A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4670471A GB1362871A (en) 1971-10-07 1971-10-07 Printing telegraph machine

Publications (1)

Publication Number Publication Date
US3742299A true US3742299A (en) 1973-06-26

Family

ID=10442276

Family Applications (1)

Application Number Title Priority Date Filing Date
US00288572A Expired - Lifetime US3742299A (en) 1971-10-07 1972-09-13 Speed detector

Country Status (5)

Country Link
US (1) US3742299A (it)
DE (1) DE2248563A1 (it)
FR (1) FR2155621A5 (it)
GB (1) GB1362871A (it)
IT (1) IT968622B (it)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893030A (en) * 1969-10-24 1975-07-01 Philips Corp Coincidence measuring circuit for indicating time intervals
US4023489A (en) * 1976-02-06 1977-05-17 Burroughs Corporation Document endorsing control circuitry and method for minimizing power consumption requirements
US4092853A (en) * 1975-10-25 1978-06-06 Robert Bosch Gmbh Testing rotary movement-electrical signal transducer system, particularly for vehicle wheel anti-block transducer systems
DE2819400A1 (de) * 1977-05-03 1978-11-09 Massachusetts Inst Technology Vorrichtung und verfahren zum ausrichten zweier koerper aufeinander
US4427970A (en) 1974-09-18 1984-01-24 Unimation, Inc. Encoding apparatus
US4539523A (en) * 1983-06-06 1985-09-03 Combustion Engineering, Inc. Frequency to voltage converter for a predetermined frequency range

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2517766C3 (de) * 1975-04-18 1982-01-07 Mannesmann AG, 4000 Düsseldorf Schutzschaltung für einen Matrixdrucker

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3893030A (en) * 1969-10-24 1975-07-01 Philips Corp Coincidence measuring circuit for indicating time intervals
US4427970A (en) 1974-09-18 1984-01-24 Unimation, Inc. Encoding apparatus
US4092853A (en) * 1975-10-25 1978-06-06 Robert Bosch Gmbh Testing rotary movement-electrical signal transducer system, particularly for vehicle wheel anti-block transducer systems
US4023489A (en) * 1976-02-06 1977-05-17 Burroughs Corporation Document endorsing control circuitry and method for minimizing power consumption requirements
DE2819400A1 (de) * 1977-05-03 1978-11-09 Massachusetts Inst Technology Vorrichtung und verfahren zum ausrichten zweier koerper aufeinander
US4539523A (en) * 1983-06-06 1985-09-03 Combustion Engineering, Inc. Frequency to voltage converter for a predetermined frequency range

Also Published As

Publication number Publication date
DE2248563A1 (de) 1973-04-12
GB1362871A (en) 1974-08-07
IT968622B (it) 1974-03-20
FR2155621A5 (it) 1973-05-18

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Legal Events

Date Code Title Description
AS Assignment

Owner name: ALCATEL N.V., DE LAIRESSESTRAAT 153, 1075 HK AMSTE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL STANDARD ELECTRIC CORPORATION, A CORP OF DE;REEL/FRAME:004718/0023

Effective date: 19870311