US3091320A - Control circuit arrangement for electric typewriter - Google Patents

Control circuit arrangement for electric typewriter Download PDF

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Publication number
US3091320A
US3091320A US186491A US18649162A US3091320A US 3091320 A US3091320 A US 3091320A US 186491 A US186491 A US 186491A US 18649162 A US18649162 A US 18649162A US 3091320 A US3091320 A US 3091320A
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United States
Prior art keywords
main
energization
control relay
relay
energized
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Expired - Lifetime
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US186491A
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English (en)
Inventor
Mertn Theodor
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Olympia Werke AG
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Olympia Werke AG
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    • 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
    • B41J23/00—Power drives for actions or mechanisms
    • B41J23/32—Electromagnetic power drives, e.g. applied to key levers
    • B41J23/34—Electromagnetic power drives, e.g. applied to key levers applied to elements other than key levers
    • 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
    • B41J25/00—Actions or mechanisms not otherwise provided for
    • B41J25/02—Key actions for specified purposes
    • 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
    • B41J7/00—Type-selecting or type-actuating mechanisms
    • B41J7/36—Selecting arrangements applied to type-carriers rotating during impression
    • B41J7/42—Timed impression, e.g. without impact
    • B41J7/44—Timed impression, e.g. without impact with impact

Definitions

  • the present invention concerns electric typewriters and more specifically a control circuit arrangement for an electric typewriter having electromagnetically actuatable type levers and key operated selector switches for selecting the type lever to be actuated.
  • the invention is concerned with the task of rendering the type writer insensitive to the manner in which the typist operates the keyboard, and of accomplishing the desired result by comparatively very simple means.
  • the keyboard of an electric typewriter may be operated in various ways, there being two distinct extremes of types of operation and an unlimited number of inbetween types where the characteristics of the extreme types blend with each other.
  • One type of operation is comparable to the style of playing a piano and called staccato while in the same manner an other extreme would be comparable to playing legato.
  • staccato type of operation is most desirable and is most generally taught because in this manner each individual key is operated individually one after the other, while in legato typing, one key may still be held down in depressed position while already another key is being actuated so that the actuations of the corresponding two type levers overlap which causes at least jamming of the type levers. The same would occur if under extreme conditions two keys are being depressed simultaneously.
  • This simultaneous operation of two keys may apply to two keys or type levers which are located adjacent to each other as well as to two keys or levers which are located rather spaced from each other.
  • the invention includes a control circuit arrangement for an electric typewriter having electromagnetically actuatable levers and key operated selector switches for selecting the type lever to be actuated, comprising, in combination, main electromagnet means for actuating any of the type levers depending upon de pression of a corresponding key and including a plurality of electrical selector means individually actuatable by the corresponding selector switch for causing respectively corresponding type levers to be actuated; first control relay means for causing, upon energization thereof, energization of said main electromagnet means; main relay means arranged to be energized simultaneously with the actuation of any single one of said plurality of electrical selector means, and for causing, upon energization thereof, energization of said first control relay means; electrical means for deenergizing said first control relay means immediately after a type lever has been actuated by said main electromagnet means; second control relay means connected to be energizable when said main relay means and said first control relay means
  • the drawing contains also certain elements constituting a stepping control which is not part of the invention.
  • the various relays are illustrated by a coil designated by a capital letter while the contacts operated by energization of the respective coil are designated by the respectively corresponding small letter, in the case of a plurality of relay contacts supplemented by a suffix number.
  • a plurality of key operated selector switches respectively associated with corresponding type levers, not shown, are illustrated only by two selector switches T and T assuming that in the present example a total number of 45 keys are arranged on the keyboard of the typewriter. These selector switches serve in the conventional manner to select the type levers to be actuated.
  • the individual selector switches T to T act to selectively energize the respectively associated selector electromagnet means St to St each of which is adapted to couple through its armature (not shown) the respectively corresponding type lever with an actuator (not shown), the latter being caused to carry out an operative stroke upon energization of at least one main electromagnet means (in the present example represented by a plurality of such main electromagnets H to H so that in this manner the selected type lever is actuated. Details of the mechanical type lever control are not shown because they do not constitute part of this invention.
  • This safety relay includes a coil B connected in series with a resistor R both being connected in parallel with the coil A.
  • the parameters of the coil B and of the resistor R are so chosen that the safety relay i.e. the coil B can be energized for moving its relay contact b from its normally closed position to open position only when more than one of the selector magnets $1 to St is energized simultaneously.
  • a normally closed contact 1 is arranged in the line 12 and this contact 1 is opened by means not shown whenever the carriage of the typewriter is shifted so that the actuaation of a type lever during the shifting of carriage is prevented.
  • the main relay coil A operates a normally open relay contact a located in a second circuit arrangement as shown and supplied with direct current voltage from a source U When the other contacts shown in this second circuit arrangement are in the positions shown in the drawing, the closing of the contact a results in enerigization of a first control relay coil D.
  • the energizing circuit for this coil -D contains a normally closed relay contact b movable to open position by energization of the above mentioned safety relay coil B, a changeover relay contact c in its normal position, and 2.
  • the closing of the normally open relay contact d causes through the connections as shown the transistors Tr and Tr to become conductive whereby through the network shown the corresponding ones of the main electromagnets H to H; are energized and the previously selected type lever is actuated.
  • the normally closed contact 11 and I1 are opened so that now the first control relay coil D is deenergized, its relay contacts d to d are returned to their normal position whereby also the second control relay coil C is deenergized.
  • the transistors Tr to Tr and the biasing resistors R and R are so constructed and dimensioned in a well known manner that the transistors operate within the circuit shown in the manner set forth above. Additional biasing resistors may be provided but are not shown in order not to encumber the drawing.
  • a push button switch T or the equivalent thereof is arranged in the circuit between the second control relay coil C and the normally open relay contact d Normally the switch T is in closed position as shown.
  • the switch T serves to cause repeat actuation of a selected type lever continuously as long as the corresponding selector switch T is held in depressed i.e. closed position. In this manner for instance underscoring or rows of periods or any other characters available in the typewriter may be produced.
  • the main relay contact a returns to open position and thus prevents further energization of the first control relay control D
  • the closing of the switch T results only in one more energization of the first control relay coil D and after the actuation of the respective type lever the above-described opening of the contacts h and h causes deenergization of the relay coil D and return of the entire arrangement to its normal starting condition.
  • the push-button switch T may be provided with conventional arresting means so as to hold this switch in open position until it is intentionally released again. It can be seen that the arrangement according to the invention as just described entails the substantial advantage that repeat actuation of a type lever can be accomplished with extremely simple means while in known typewriter control arrangements rather involved special devices must be provided in connection with selected type levers. Thus this arrangement is advantageously simplified in this respect and yields the further advantage that the single switch T is sufiicient to cause repeat actuation of any one of the existing type levers of the typewriter.
  • a further normally open switch T may be provided in parallel with the above described contacts d; and 2 so that by closing the switch T a single step movement of the carriage of the typewriter can be effected by energization of the stepping magnet coil S.
  • change-over contact d is moved with the consequence of energizing the stepping magnet S as described above, and the holding contact d is closed so as to hold the coil D in energized condition until the contact I1 is moved to open position after the energiza tion of a type lever by at least one of the coils H to H
  • the return of the contact (2 to original position occurs only after the release of the respective key operated selector switch T has deenergized the main relay A and thereby opened the main relay contact a.
  • the completion of the key lever actuation has opened the contact 11 and 11 and thereby deenergized the first control relay coil D.
  • the second possibility of irregular operation consists in an inadvertent simultaneous actuation of at least two or more of the key operated selector switches T to T
  • the safety relay coil B is energized simultaneously with the main relay coil A, but although the relay contact a is closed simultaneously the safety relay contact I) is opened whereby an energization of the first control relay D and therefore any actuation of any one of the key levers is prevented at the outset.
  • the arrangement according to the invention provides in a comparatively very simple manner not only for carrying out all desired normal operations of an electric typewriter, including the above described advantage in repeat actuation of any one of the existing type levers, but also prevents any undesirable malfunction in case that the time periods of actuation of different key operated selector switches overlap, or even if two or more of these key operated selector switches are actuated simultaneously, no matter whether the respective keys or type levers are adjacent to each other or separated from each other.
  • Control circuit arrangement for an electric typewriter having electromagnetically actuatable type levers and key operated selector switches for selecting the type lever to be actuated comprising, in combination,
  • main electromagnet means for actuating any of the type levers depending upon depression of a corresponding key and including a plurality of electrical selector means individually actuatable by the corresponding selector switch for causing respectively corresponding type lovers to be actuated;
  • first control relay means for causing, upon energization thereof, energization of said main electromagnet means
  • main relay means arranged to be energized simul taneously with the actuation of any single one of said plurality of electrical selector means, and for causing, upon energization thereof, energizat-ion of said first control relay means;
  • second control relay means connected to be energizable when said rnain relay means and said first control relay means are simultaneously in energized condition and including means for deenergizing said first control relay means while simultaneously holding said second control relay means energized, after said first control relay means is deenergized, as long as said main relay means is in energized condition after energization of said second control relay means;
  • electrical means operable in parallel with said main relay means for preventing energization of said first control relay means by said main relay means when more than one of said electrical selector means is energized simultaneously.
  • Control circuit arrangement for an electric typewriter having eleotromagnetically actuatable type levers and key operated selector switches for selecting the type lever to be actuated comprising, in combination,
  • main electnomagnet means for actuating any of the type levers depending upon depression of a corre- 7 sponding key and including a plurality of electrical selector means individually actuatable by the corresponding selector switch for causing respectively corresponding type levers to be actuated;
  • first control relay means including first normally b. first control relay means for causing, upon eneropen contact means in circuit with said main elecgization thereof, energization of said main electrotrom agnet means and movable to closed position magnet means; upon energization or" said first control relay means 0.
  • main relay means arranged to be energized simulso as to cause energization of said main electromagtaneously with the actuation of any single one of net means; said plurality of electrical selector means, and for 10 a main relay means including a main relay coil concausing, upon energization thereof, energization of nected in series with each individual one of said said first control relay means; plurality of selector electromagnet means so as to d. electrical means for deenergizing said first control be energized when any one of said selector electrorelay means immediately after a type lever has been magnet means is energized, and second normally actuated by said main electromagnet means; and open contact means in circuit with said first cone.
  • second control relay means connected to be enertrol relay means for energizing the latter when said giza'ble when said main relay means and said first second normally open contact means is moved to control relay means are simultaneously in energized closed position by energization of said main relay condition and including means for deenergizing said coil; first control relay means while simultaneously holdd. normally closed contact means arranged in circuit ing said second control relay means energized, after with said first control relay means and movable to said first control relay means is deenergized, as long open position by said main electromagnet means as said main relay means is in energized condition when the latter is fully energized so as to deenerafter energization of said second control relay means. gize said first control relay means when a type lever 3. Control circuit arrangement for an electric typehas been actuated;
  • writer having electromagnetically actuatable type levers second control relay lrneans including a second reand key operated selector switches for selecting the type lay coil connected also in circuit with said second lever to be actuated, comprising, in combination, normally open contact means, a third normally open a.
  • main electromagnet means fior actuating any of the contact means being connected between said second type levers depending upon depression of a correnormally open contact means and said second repo di g key and including a plurality of electrical lay coil and movable to closed position upon enselector means individually actuata ble by the correergization of said first control relay means, changesponding selector switch for causing respectively corover relay contact means being connected between responding type levers to be actuated; said second normally open contact means and said first Control relay means for Causing, 1113011 enerfirst control relay means and said second relay coil gizat-ion thereof, energization of said main electroand movable from a first normal position in which magnet means; said second normally open contact means is conc.
  • main relay means arranged to be energized simulneoted with said first control relay means, to a sectaneously with the actuation of any single one of ond position in which it establishes a holding consaid plurality of electrical selector means, and for nection in parallel with said third normally open causing, upon energization thereof, energization of contact means upon energization of said second resaid first control relay means; lay coil thereby holding the latter energized when d.
  • electrical means for deenergizing said first control said third normally open contact means returns to relay means immediately after a type lever has b n open position and as long as said second normally actuated y Said main r magnet means; open contact means is in closed position after enere.
  • second control relay means connected to be energization f id d relay 11, hil i l gizable when said main relay means and said first 'ously interrupting in said second position th control relay means are simultaneously in energized ne ti b t id Second normally Open t t condition and including means for deenergizing said me n d id fi t t l relay means; nd first control relay means while simultaneously holdelectrical means connected in parallel with said main illg Said Second Control TelaY means enefgiled, after relay means for interrupting the connection between Said first Coll-U01 relay means is deenefgl'zed, as long said second normally open contact means and said as said main relay means is in energized condition first control relay means when more th ne f id t r energization Said Second Control relay means; selector electromagnet means is energized simultaneand ously.
  • safety relay means including a safety relay coil connected and constructed for being effectively energized simultaneously with said main relay means only when more than one of said electrical selector means is energized simultaneously, and means controllable by said safety relay coil so as to prevent energization of said first control relay means by said main relay means when more than one of said electrical selector means is energized simultaneously.
  • Control circuit arrangement for an electric typewriter having electromagnetically *actuatable type levers and key operated selector switches for selecting the type lever to be actuated comprising, in combination,
  • At least one main electromagnet means for actuating any of the type levers upon energization of said main electromagnet means
  • first control relay means including first normally open contact means in circuit with said main electromagnet means and movable to closed position upon energization of said first control relay means so as to cause energization of said main electromagnet means;
  • a main rel-ay means including a main relay coil connected in series with each individual one of said plurality of selector electromagnet means so as to be energized when any one of said selector electromagnet means is energized, and second normally open contact means in circuit with said first control relay means for energizing the latter when said second normally open contact means is moved to closed position by energization of said main relay coil;
  • normally closed contact means arranged in circuit with said first control relay means and movable to open position by said main electromagnet means when the latter is fully energized so as to deenergize said first control relay means when a type lever has been actuated;
  • second control relay means including a second relay coil connected also in circuit with said second normally open contact means, a third normally open contact means being connected between said second normally open contact means and said second relay coil and movable to closed position upon energization of said first control relay means, changeover relay contact means being connected between said second normally open contact means and said first control relay means and said second relay coil and movable from a first normal position in which said second normally open contact means is connected with said first control relay means, to a second position in which it establishes a holding connection in parallel with said third normally open contact means upon energization of said second relay coil thereby holding the latter enengized when said third normally open contact lmeans returns to open position and as long as said second normally open contact means is in closed position after energization of said second relay coil, while simultaneously interrupting in said second position the connection between said second normally open contact means and said first control relay means.
  • Control circuit arrangement for an electric typewriter having electrornagnetically actuatable type levers and key operated selector switches for selecting the type lever to be actuated comprising, in combination,
  • At least one main electromagnet means for actuating any of the type levers upon energization of said main electromagnet means
  • first control relay means including first normally open contact means in circuit with said main electromagnet means and movable to closed position upon energization of said first control relay means so as to cause energization of said main electromagnet means;
  • a main relay means including a main relay coil connected in series with each individual one of said plurality of selector electromagnet means so as to be energized when any one of said selector electromagnet means is energized, and second normally open contact means in circuti with said first control relay means for energizing the latter when said second normally open contact means is moved to closed position by energization of said main relay coil;
  • normally closed contact means arranged in circuit with said first control relay means and movable to open position by said main electromagnet means when the latter is fully energized so as to deenergize said first control relay means when a type lever has been actuated;
  • second control relay means including a second relay coil connected also in circuit with said second normally open contact means, a third normally open contact means being connected between said second normally open contact means and said second relay coil and movable to closed position upon energization of said first control relay means, change-over relay contact means being connected between said second normally open contact means and said first control relay means and said second relay coil and movable from a first normal position in which said second normally open contact means is connected with said first control relay means, to a second position in which it establishes a holding connection in parallel with said third normally open contact means upon energization of said second relay coil thereby holding the latter energized when said third normally open contact means returns to open position and as long as said second normally open contact means is in closed position after energization of said second relay coil, while simultaneously interrupting in said second position the connection between said second normally open contact means and said first control relay means; and
  • safety relay means including a safety relay coil connected in parallel with said main relay coil and being effectively energizable simultaneously with said main relay coil only when more than one of said selector electromagnet means is energized simultaneously, and a normally closed safety relay contact means arranged between said second normally open contact means and said change-over relay contact means for interrupting the connection between said second normally open contact means and said first control relay means when more than one of said selector electromagnet means is energized simultaneonsly.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Input From Keyboards Or The Like (AREA)
  • Inking, Control Or Cleaning Of Printing Machines (AREA)
  • Push-Button Switches (AREA)
  • Keying Circuit Devices (AREA)
US186491A 1961-04-10 1962-04-10 Control circuit arrangement for electric typewriter Expired - Lifetime US3091320A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEO0007993 1961-04-10

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US3091320A true US3091320A (en) 1963-05-28

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Application Number Title Priority Date Filing Date
US186491A Expired - Lifetime US3091320A (en) 1961-04-10 1962-04-10 Control circuit arrangement for electric typewriter

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US (1) US3091320A (enrdf_load_stackoverflow)
CH (1) CH401101A (enrdf_load_stackoverflow)
DE (1) DE1636139B2 (enrdf_load_stackoverflow)
FR (1) FR1319261A (enrdf_load_stackoverflow)
GB (1) GB982764A (enrdf_load_stackoverflow)
NL (2) NL120378C (enrdf_load_stackoverflow)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3289806A (en) * 1964-02-29 1966-12-06 Manus George Control system for electric typewriters including current limiting means
US3454147A (en) * 1966-06-23 1969-07-08 Walther Bueromasch Gmbh Key locking circuit for a keyboard operated machine
US3618034A (en) * 1968-04-05 1971-11-02 Klaus Jorg Hecker Method and system for controlling printout elements in a printout mechanism
US3624645A (en) * 1969-12-15 1971-11-30 Sperry Rand Corp Oscillator keyboard with roll and double-strike control
US3940800A (en) * 1973-06-09 1976-02-24 Sony Corporation Mode selecting device having a time delay between selection and establishment of an operating mode for tape recording and/or recording apparatus
US3947894A (en) * 1973-11-24 1976-03-30 Sony Corporation Mode selecting device for tape recording and/or reproducing with releasable lock

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2712101A (en) * 1955-06-28 sal ati
US2787740A (en) * 1952-04-19 1957-04-02 Int Standard Electric Corp Circuit arrangement for the blocking of circuits in interlocking plants operating with electric lockings
US2869703A (en) * 1953-06-08 1959-01-20 Grundig Max Type key blocking mechanism
US2971135A (en) * 1957-05-24 1961-02-07 Honeywell Regulator Co Switch arrangement

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2712101A (en) * 1955-06-28 sal ati
US2787740A (en) * 1952-04-19 1957-04-02 Int Standard Electric Corp Circuit arrangement for the blocking of circuits in interlocking plants operating with electric lockings
US2869703A (en) * 1953-06-08 1959-01-20 Grundig Max Type key blocking mechanism
US2971135A (en) * 1957-05-24 1961-02-07 Honeywell Regulator Co Switch arrangement

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3289806A (en) * 1964-02-29 1966-12-06 Manus George Control system for electric typewriters including current limiting means
US3454147A (en) * 1966-06-23 1969-07-08 Walther Bueromasch Gmbh Key locking circuit for a keyboard operated machine
US3618034A (en) * 1968-04-05 1971-11-02 Klaus Jorg Hecker Method and system for controlling printout elements in a printout mechanism
US3624645A (en) * 1969-12-15 1971-11-30 Sperry Rand Corp Oscillator keyboard with roll and double-strike control
US3940800A (en) * 1973-06-09 1976-02-24 Sony Corporation Mode selecting device having a time delay between selection and establishment of an operating mode for tape recording and/or recording apparatus
US3947894A (en) * 1973-11-24 1976-03-30 Sony Corporation Mode selecting device for tape recording and/or reproducing with releasable lock

Also Published As

Publication number Publication date
FR1319261A (fr) 1963-02-22
NL276933A (enrdf_load_stackoverflow)
CH401101A (de) 1965-10-31
NL120378C (enrdf_load_stackoverflow)
DE1636139B2 (de) 1971-06-03
GB982764A (en) 1965-02-10
DE1636139A1 (de) 1971-01-21

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