US3742299A - Speed detector - Google Patents
Speed detector Download PDFInfo
- 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
- Authority
- 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
Links
Images
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.
Landscapes
- 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)
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)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2517766C3 (de) * | 1975-04-18 | 1982-01-07 | Mannesmann AG, 4000 Düsseldorf | Schutzschaltung für einen Matrixdrucker |
-
1971
- 1971-10-07 GB GB4670471A patent/GB1362871A/en not_active Expired
-
1972
- 1972-09-13 US US00288572A patent/US3742299A/en not_active Expired - Lifetime
- 1972-10-04 DE DE19722248563 patent/DE2248563A1/de active Pending
- 1972-10-05 IT IT30090/72A patent/IT968622B/it active
- 1972-10-06 FR FR7235427A patent/FR2155621A5/fr not_active Expired
Cited By (6)
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 |