US3816656A - Teleprinter having a type cylinder which is adjustable by means of a stepping motor - Google Patents

Teleprinter having a type cylinder which is adjustable by means of a stepping motor Download PDF

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Publication number
US3816656A
US3816656A US00302569A US30256972A US3816656A US 3816656 A US3816656 A US 3816656A US 00302569 A US00302569 A US 00302569A US 30256972 A US30256972 A US 30256972A US 3816656 A US3816656 A US 3816656A
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US
United States
Prior art keywords
type cylinder
binary counter
stepping motor
counter
timing
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
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US00302569A
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English (en)
Inventor
M Ludwig
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.)
Siemens AG
Siemens Corp
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Siemens Corp
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Filing date
Publication date
Priority claimed from DE19712154899 external-priority patent/DE2154899C3/de
Application filed by Siemens Corp filed Critical Siemens Corp
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Publication of US3816656A publication Critical patent/US3816656A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

  • ABSTRACT A teleprinter for n-step codes having a type cylinder which can be adjusted by a stepping motor by means of rotating the type cylinder in both directions comprises a position comparing device and an n-digit electronic binary counter for counting marks arranged in a row at the circumference of a timing disk carried for rotation with the type cylinder. The position of the timing disk is compared electronically with the received code combination associated with the type to be positioned and the type carrier is operated to the next circumferential position in accordance with the lesser distance of travel in the advance or reset direction of rotation of the type carrier.
  • This invention relates to a teleprinter, and more particularly to a teleprinter having a n-stepping code comprising a type cylinder which can be adjusted by a stepping motor by means of rotating the type cylinder in both directions and comprising a code-comparing device having marks upon a disk or roller which can be scanned and which are rotated along with the type carrier.
  • the primary object of the present invention is to provide a teleprinter of the type mentioned above comprising a comparing system having a binary counter, as described above, and a simple system by which it can easily be decided whether the next printing location can be reached on the shortest path of travel by means of advancing or resetting the type carrier.
  • a timing counter which can be controlled by way of the test binary counter is controlled when half of the number of printingpositions or less along the circumference are counted before the end position is reached to effect an adjustment of the stepping motor in the advance direction and if half of the number of printing positions or more is exceeded, will effect an adjustment of the stepping motor in the reverse direction.
  • a solution which can be realized simply and inexpensively, for example, in accordance with the prior art MOS technique is provided in that a flip-flop stage is connected to the timing counter which, after a teleprinter symbol has been stored, is effective in the sense of influencing a control circuit which reacts according to logical switching states in one or the other sense and influences the. stepping motor,f1rst of all, in. the advance direction.
  • the timing counter influences a control circuit, possibly while reaching a position corresponding to half the passed-through printing positions, in such a way that the stimulation is completed and thus the reset of the stepping motor is caused while the advance control of the stepping motor becomes effective when lower timing numbers are detected before reaching the next printing position.
  • FIG. 1 is a schematic logic diagram of the system according to the invention.
  • FIG. 2 is a plan view of the timing disk TS employed in FIG. 1;
  • FIG. 3 is a more detailed logic diagram of a control circuit employed in FIG. 1;
  • FIG. 4 is a schematic logic diagram of a circuit for controlling the stepping motor.
  • the register ER comprises an electronic series/- parallel converter.
  • the type carrier of the printing system is embodied as a type cylinder T'l which is adjustable in either direction by means of a stepping motor SM.
  • a timing Disk TS which is illustrated in a plan view in FIG. 2, is attached upon a shaft 2 which defines the axis of rotation of the type cylinder TT.
  • the timing Disk TS comprises marks 1 at a predetermined radial distance from the shaft 2, which marks are scanned by a transducerW.
  • a mark 3 is carried on the disk T8 at a different radius and appears only once per revolution and serves for producing a synchronizing pulse which is not essential for the invention and is therefore not further treated herein.
  • the contents of a five-digit binary counter BZ which is provided in the circuit respectively correspond to the binary numbers by which the code combination can be expressed which is associated with the instantaneous position of the type cylinder TT.
  • the construction of the binary counter may, for example, correspond to that disclosed in the German Letters Pat. No. 1,055,047.
  • a comparing device V compares the symbols stored in the input register ER (with the bits in parallel form) with the contents of the binary counter 82, on the one hand, and on the other hand compares with the contents of a test binary counter PZ. Both counters are switched further over one digit in the five-digit dual system when an individual timing pulse arises.
  • the development when the counters are switched is as follows.
  • a character printing process is effected directly by way of an output A.
  • the adjusting movement is stimulated in the test binary counter PZ before the adjusting movement of the type carrier TT at a 200 kHz frequency as follows. Since a maximum of 16 steps are required for adjusting in an advance or reset motion in the example as selected, microseconds are required. This time is negligible compared with the mechanical adjustment time (65 miliseconds with Bd).
  • a bistable flipflop circuit SpI is connected into this control circuit ST and is therefore activated by way of a monostable flipflop circuit MK, or an OR gate G6 and the AND gates G2, so that the information stored in the binary counter BZ reflecting the position of the type carrier TI" is transferred by the test binary counter PZ.
  • a timing counter TZ and a flip-flop stage K are reset.
  • the position of the flip-flop stage K obtained in this manner contains the direction that the stepping motor SM must be driven in a direction herein called the advance direction for a control circuit SST for the stepping motor SM.
  • the test binary counter P2 is switched further in accordance with this timing frequency.
  • the comparing device V thereby compares the information stored in the input register ER with that of the further switched test binary counter PZ.
  • the timing counter T2 is switched further in accordance with the same timing frequency. If the comparing device V detects coincidence with the contents of the input register ER and the test binary counter PZ, then the simulated adjustment is ended in the test binary counter PZ and the adjustment of the type carrier TT is initiated by the stepping motor SM by way of the bistable flip-flop stages Spl and Sp2. If the timing counter PZ has not reached the counting value 16 in the meantime, the flip-flop stage K which is connected to the timing counter TZ is reset.
  • the stepping motor SM is driven in an advance direction. If the timing counter has reached the position 16 again before the comparing device V finds coincidence between the contents of the input register ER and the contents of the test binary counter PZ, then a pulse will be emitted from the timing counter TZ which, and in the same manner as the comparing device V in the other case, will initiate the adjusting process of the type carrier TT by means of the stepping motor SM by way of the bistable flip-flop stages Spl and Sp2. However, the circuit ST will simultaneously place the flip-flop K in a position which announces a reset motion of the stepping motor SM to the control circuit SST for the stepping motor SM.
  • Timing pulses ZT are generated due to the rotation of the timing disk TS pass the transducer W as the type carrier TT is adjusted and reach the binary counter BZ whereby the latter is selectively switched further forward or backwardthe flip-flop stage K either activates the AND gate G3 or the AND gate G4-due to the symbol pulses ZT by way of one of the gates G3 or G4, respectively.
  • the contents of the binary counter BZ are further processed and applied to the test binary counter PZ by way of the gates G2, and the test binary counter PZ makes this information available for the comparing device V.
  • a gate G7 is blocked so that the comparing device V cannot further process any information to the type printing device by way of the output A if the contents of the input register ER and the contents of the test binary counter PZ coincide. Only after the adjusting process of the type carrier TT by way of the stepping motor SM has been completed will this printing order be further processed.
  • the stepping motor SM in the selected example has three poles, i.e., it comprises three excitation windings. Corresponding to these three excitation windings, a three-stage shift register R2 is provided in the control circuit. Depending on the position of the shift register, one of the excitation windings 'of the stepping motor SM will be excited by way of a corresponding amplifier circuit VS.
  • the stepping frequency is supplied to the shift register by a timing generator SchT (not illustrated in detail) by way of an AND gate G5 when the corresponding information concerning the adjusting movement is provided by way of the bistable flip-flop stage ST.
  • the direction of the pulse supply for the shift register RZ is predetermined, depending on the position of the flip-flop stage K by way of the gates G8 and G9.
  • a teleprinter for n-step codes comprising: a rotatable type cylinder, a stepping motor connected to said type cylinder for rotating said type cylinder in both directions, a position comparing device comprising a timing disk mutually rotatable with said type cylinder and carrying thereon a plurality of marks, means for reading said marks as said type cylinder is rotated, an n-digit electronic binary counter connected to said reading means for storing the position of said type cylinder, means for receiving an n-digit code corresponding to a symbol to be typed, means for comparing the contents of said receiving means and the contents of said n-digit electronic binary counter and producing a printing pulse in response to coincidence, and means for controlling the rotation of the type carrier over the shortest path for the next circumferential position thereof including a test binary counter interposed between said n-digit electronic binary counter and said comparing means, means for advancing said test binary counter to simulate advancement of said n-digit electronic binary counter to produce a simulated demanded adjustment of said biary counter for the next circum
  • a teleprinter comprising a flip-flop stage and a control circuit, said flip-flop stage connected to said timing counter and responsive to receipt of a symbol to be typed to cause said control circuit to effect operation of said stepping motor in the advance direction, said timing counter connected to said control circuit and operable to cause said control circuit to effect operation of said stepping motor in the opposite direction when a position is reached corresponding to half the printing positions.

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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)
US00302569A 1971-11-04 1972-10-31 Teleprinter having a type cylinder which is adjustable by means of a stepping motor Expired - Lifetime US3816656A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712154899 DE2154899C3 (de) 1971-11-04 Fernschreibmaschine mit durch Schrittmotor einstellbarem Typenzylinder

Publications (1)

Publication Number Publication Date
US3816656A true US3816656A (en) 1974-06-11

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ID=5824214

Family Applications (1)

Application Number Title Priority Date Filing Date
US00302569A Expired - Lifetime US3816656A (en) 1971-11-04 1972-10-31 Teleprinter having a type cylinder which is adjustable by means of a stepping motor

Country Status (11)

Country Link
US (1) US3816656A (cs)
JP (1) JPS4855604A (cs)
AR (1) AR194513A1 (cs)
AU (1) AU463799B2 (cs)
BE (1) BE790906A (cs)
CS (1) CS180607B2 (cs)
FR (1) FR2160042A5 (cs)
GB (1) GB1367214A (cs)
IT (1) IT970161B (cs)
LU (1) LU66412A1 (cs)
NL (1) NL7214835A (cs)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3986094A (en) * 1974-07-01 1976-10-12 Burroughs Corporation Logic system for print ball tilt control
US4005264A (en) * 1974-09-06 1977-01-25 Siemens Aktiengesellschaft Arrangement for scanning a disc-shaped type carrier
US4072888A (en) * 1974-05-02 1978-02-07 International Business Machines Corp. Method of controlling a stepper motor
US4107594A (en) * 1977-01-24 1978-08-15 Teletype Corporation Step motor velocity control
US4156105A (en) * 1977-05-11 1979-05-22 Siemens Aktiengesellschaft Circuit arrangement for synchronizing a type carrier in a printer
US4401931A (en) * 1980-12-08 1983-08-30 International Business Machines Corporation Apparatus actuated by a pair of stepper motors with shared drive
US4821644A (en) * 1986-03-25 1989-04-18 Alcatel Business Systems Limited Method and apparatus for positioning a member
US4953996A (en) * 1987-10-27 1990-09-04 Pitney Bowes Inc. Printwheel setting device for a postage meter

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4072888A (en) * 1974-05-02 1978-02-07 International Business Machines Corp. Method of controlling a stepper motor
US3986094A (en) * 1974-07-01 1976-10-12 Burroughs Corporation Logic system for print ball tilt control
US4005264A (en) * 1974-09-06 1977-01-25 Siemens Aktiengesellschaft Arrangement for scanning a disc-shaped type carrier
US4107594A (en) * 1977-01-24 1978-08-15 Teletype Corporation Step motor velocity control
US4156105A (en) * 1977-05-11 1979-05-22 Siemens Aktiengesellschaft Circuit arrangement for synchronizing a type carrier in a printer
US4401931A (en) * 1980-12-08 1983-08-30 International Business Machines Corporation Apparatus actuated by a pair of stepper motors with shared drive
US4821644A (en) * 1986-03-25 1989-04-18 Alcatel Business Systems Limited Method and apparatus for positioning a member
US4953996A (en) * 1987-10-27 1990-09-04 Pitney Bowes Inc. Printwheel setting device for a postage meter

Also Published As

Publication number Publication date
JPS4855604A (cs) 1973-08-04
IT970161B (it) 1974-04-10
AU4731672A (en) 1974-04-11
FR2160042A5 (cs) 1973-06-22
GB1367214A (en) 1974-09-18
AR194513A1 (es) 1973-07-23
BE790906A (fr) 1973-05-03
NL7214835A (cs) 1973-05-08
DE2154899A1 (de) 1973-05-10
DE2154899B2 (de) 1976-08-26
AU463799B2 (en) 1975-08-07
CS180607B2 (en) 1978-01-31
LU66412A1 (cs) 1973-05-15

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