US3353038A - Signal generating arrangement for an electric typewriter and similar apparatus - Google Patents

Signal generating arrangement for an electric typewriter and similar apparatus Download PDF

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Publication number
US3353038A
US3353038A US488317A US48831765A US3353038A US 3353038 A US3353038 A US 3353038A US 488317 A US488317 A US 488317A US 48831765 A US48831765 A US 48831765A US 3353038 A US3353038 A US 3353038A
Authority
US
United States
Prior art keywords
cantilever
keybar
key
electric
piezo
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
US488317A
Other languages
English (en)
Inventor
Frederick P Mason
Graham J L Stevens
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.)
Creed and Co Ltd
Original Assignee
Creed and Co Ltd
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 Creed and Co Ltd filed Critical Creed and Co Ltd
Application granted granted Critical
Publication of US3353038A publication Critical patent/US3353038A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B41J5/00—Devices or arrangements for controlling character selection
    • B41J5/08—Character or syllable selected by means of keys or keyboards of the typewriter type
    • B41J5/14—Construction of 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
    • B41J7/00—Type-selecting or type-actuating mechanisms
    • B41J7/54—Selecting arrangements including combinations, permutation, summation, or aggregation means
    • B41J7/68—Selecting arrangements including combinations, permutation, summation, or aggregation means with means for selectively closing an electric circuit for type presentation
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/96—Touch switches
    • H03K17/964—Piezoelectric touch switches
    • H03K17/9643—Piezoelectric touch switches using a plurality of detectors, e.g. keyboard
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/965—Switches controlled by moving an element forming part of the switch
    • H03K17/967—Switches controlled by moving an element forming part of the switch having a plurality of control members, e.g. keyboard
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L13/00—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00
    • H04L13/16—Details of the apparatus or circuits covered by groups H04L15/00 or H04L17/00 of transmitters, e.g. code-bars, code-discs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes

Definitions

  • the invention relates to a key-operated signal generating arrangement for an electric typewriter, teleprinter or other key-operated apparatus wherein depression of a key is required to cause an electric signal to be transmitted elsewhere or to set in train various electrical and/or mechanical interconnections.
  • the keys of a keyboard are required to do no more than generate an appropriate signal without mechanical linkage to other members, such as typebars, interlocking arrangements and so forth. What is then desirable is that depression of a key shall set up an electrical control signal which persists for as long as the apparatus is under the control of that particular key.
  • a piezo-resistive or a piezoelectric element particular to the key.
  • the advantage of using a piezo-resistive element is that such an element exhibits a resistance change which continues for so long as the mechanical force applied to it remains, in other words, for so long as the key remains depressed.
  • the above mentioned difficulty in using a piezo-electric element for keyboard operation is overcome by arranging that actuation of a key subjects the element to vibratory strain.
  • a signal generating arrangement for an electric typewriter, teleprinter or other key-operated apparatus including a pieZo-electric crystal element and a key mechanically coupled together in such manner that actuation of the keybar causes the piezo-electric element to be subject to alternating strain and the relay generate an electric signal of substantial duration.
  • a keybar arrangement for an electric typewriter, teleprinter or other ke -operated apparatus including a keybar, a vibratory cantilever, a piezo-electric crystal element mounted on the cantilever and arranged to generate an electric signal upon vibratory flexure of the cantilever, magnet means causing the cantilever to be mechanically coupled to the keybar so as to follow its movement over a given range, and means causing disengagement of the cantilever from the keybar and consequent vibration of 3,353,033 Patented Nov. 14, 1967 ICC the cantilever when the movement of the keybar exceeds the given range.
  • the embodiment illustrated has a keybar 1 mounted for pivotal movement about a pin 10 in the directions indicated by the arrows A and B.
  • the keybar is shown in its rest position, to which it is urged by a return spring 2 against an upper limit stop 11, the spring working against and the stop being mounted on a mounting frame, portions only of which are indicated at 3.
  • the free end of the keybar carries a conventional typewriter key 12.
  • a vibratory cantilever 4 of elastic material such as spring steel, is clamped at one end at 5 above the keybar.
  • a piezo-electric crystal element 6 mounted to a pair of output leads marked OP.
  • a permanent magnet 9 is secured to the keybar 1 and, in the rest position of the keybar, attracts against it the cantirever 4, or, in the case where the cantilever is of nonmagnetic material, an armature 8 secured to the cantilever 4.
  • a stop member 7 is mounted on the frame 3 below the free end of cantilever 4.
  • the keybar 1 When, now, the key 12 is depressed, the keybar 1 carries with it magnet 9, which draws downs the cantilever until it engages the stop member 7. Further downward movement of keybar 1 forces the magnet to disengage from the cantilever or its armature, as the case may be; the cantilever is now free to vibrate and cause flexural vibration of the piezo-electric element and consequent generation of an alternating electric signal voltage across the output leads OP.
  • the key may be considered to be actuated when it has been depressed to the extent necessary to free the cantilever. In the normal arrangement, as discussed above, it will then be locked, by means not shown until the associated apparatus is ready to perform a new key-controlled function. On being returned to its rest position, the magnet 9 re-engages the cantilever on its armature and the cantilever is once more mechanically coupled to the keybar.
  • a keybar arrangement for key-operated apparatus comprising a keybar, a vibratory cantilever, a piezo-electic crystal element mounted on the cantilever and arranged to generate an electric signal upon vibratory flexure of the cantilever, magnet means causing the cantilever to be mechanically coupled to the keybar so as to follow its movement over a given range, and means causing disengagement of the cantilever from the keybar and consequent vibration of the cantilever when the movement of the keybar exceeds the given range.
  • a keybar arrangement as claimed in claim 1 wherein the keybar is a lever pivoted at one end for rotation in a vertical plane when the arrangement is placed in its normal attitude for use, return spring means being provided for returning the keybar after depression to a rest position, wherein the magnet means includes a magnet attached to the keybar, the cantilever arranged to be attracted against the magnet when the keybar is in its rest position, the cantilever being mounted above the keybar, and wherein a stop member engages the cantilever and effects disengagement between the magnet and canti lever when the keybar is depressed beyond the position corresponding to engagement of the cantilever with the stop member.

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Impact Printers (AREA)
  • Character Spaces And Line Spaces In Printers (AREA)
  • Push-Button Switches (AREA)
  • Input From Keyboards Or The Like (AREA)
US488317A 1964-11-06 1965-09-20 Signal generating arrangement for an electric typewriter and similar apparatus Expired - Lifetime US3353038A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB45303/64A GB1028059A (en) 1964-11-06 1964-11-06 A signal generating arrangement for an electric typewriter and similar apparatus

Publications (1)

Publication Number Publication Date
US3353038A true US3353038A (en) 1967-11-14

Family

ID=10436697

Family Applications (1)

Application Number Title Priority Date Filing Date
US488317A Expired - Lifetime US3353038A (en) 1964-11-06 1965-09-20 Signal generating arrangement for an electric typewriter and similar apparatus

Country Status (8)

Country Link
US (1) US3353038A (enrdf_load_stackoverflow)
BE (1) BE671971A (enrdf_load_stackoverflow)
CH (1) CH436789A (enrdf_load_stackoverflow)
DE (1) DE1499177A1 (enrdf_load_stackoverflow)
FR (1) FR1454151A (enrdf_load_stackoverflow)
GB (1) GB1028059A (enrdf_load_stackoverflow)
NL (1) NL6514436A (enrdf_load_stackoverflow)
SE (1) SE335549B (enrdf_load_stackoverflow)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3464531A (en) * 1967-05-16 1969-09-02 Us Army Manual electronic keyboard
US3725908A (en) * 1971-06-21 1973-04-03 Control Data Corp Impact transducer keyboard apparatus
US3831730A (en) * 1973-01-31 1974-08-27 D Koeppe Keyboards
US3976899A (en) * 1973-01-04 1976-08-24 U.S. Philips Corporation Snap action mechanical-electrical piezoelectric transducer
US4359612A (en) * 1980-09-24 1982-11-16 Engineering Research Applications, Inc. Universal keyboard and method of producing same
US4359613A (en) * 1981-03-16 1982-11-16 Engineering Research Applications, Inc. Molded keyboard and method of fabricating same
US4378552A (en) * 1977-11-21 1983-03-29 Scm Corporation Acoustic encoding apparatus
USRE32419E (en) * 1981-03-16 1987-05-12 Engineering Research Applications, Inc. Molded keyboard and method of fabricating same

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4269521A (en) * 1978-10-11 1981-05-26 Scm Corporation Key mechanism having a snap action
EP0165245B1 (en) * 1983-12-20 1989-07-19 Caterpillar Inc. Frictionally driven belted work vehicle
DE102007053820A1 (de) * 2007-11-12 2009-05-14 BSH Bosch und Siemens Hausgeräte GmbH Elektrogerätschaltvorrichtung
US20190260312A1 (en) * 2016-12-02 2019-08-22 Panasonic Intellectual Property Management Co., Ltd. Power generation device

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2302081A (en) * 1941-06-19 1942-11-17 Ibm Signaling system
US2309703A (en) * 1941-05-21 1943-02-02 Bell Telephone Labor Inc Alternating current generator
US2464045A (en) * 1947-03-20 1949-03-08 Walter E Kuenstler Frequency control device
US2921252A (en) * 1957-05-28 1960-01-12 Edward L Schiavone Electric generator

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2309703A (en) * 1941-05-21 1943-02-02 Bell Telephone Labor Inc Alternating current generator
US2302081A (en) * 1941-06-19 1942-11-17 Ibm Signaling system
US2464045A (en) * 1947-03-20 1949-03-08 Walter E Kuenstler Frequency control device
US2921252A (en) * 1957-05-28 1960-01-12 Edward L Schiavone Electric generator

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3464531A (en) * 1967-05-16 1969-09-02 Us Army Manual electronic keyboard
US3725908A (en) * 1971-06-21 1973-04-03 Control Data Corp Impact transducer keyboard apparatus
US3976899A (en) * 1973-01-04 1976-08-24 U.S. Philips Corporation Snap action mechanical-electrical piezoelectric transducer
US3831730A (en) * 1973-01-31 1974-08-27 D Koeppe Keyboards
US4378552A (en) * 1977-11-21 1983-03-29 Scm Corporation Acoustic encoding apparatus
US4359612A (en) * 1980-09-24 1982-11-16 Engineering Research Applications, Inc. Universal keyboard and method of producing same
US4359613A (en) * 1981-03-16 1982-11-16 Engineering Research Applications, Inc. Molded keyboard and method of fabricating same
USRE32419E (en) * 1981-03-16 1987-05-12 Engineering Research Applications, Inc. Molded keyboard and method of fabricating same

Also Published As

Publication number Publication date
CH436789A (de) 1967-05-31
NL6514436A (enrdf_load_stackoverflow) 1966-05-09
DE1499177A1 (de) 1969-10-23
BE671971A (enrdf_load_stackoverflow) 1966-05-09
GB1028059A (en) 1966-05-04
SE335549B (enrdf_load_stackoverflow) 1971-06-01
FR1454151A (fr) 1966-07-22

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