US2226698A - Printing telegraph apparatus - Google Patents

Printing telegraph apparatus Download PDF

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Publication number
US2226698A
US2226698A US150466A US15046637A US2226698A US 2226698 A US2226698 A US 2226698A US 150466 A US150466 A US 150466A US 15046637 A US15046637 A US 15046637A US 2226698 A US2226698 A US 2226698A
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United States
Prior art keywords
printing
plate
printing telegraph
hammer
lever
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
US150466A
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English (en)
Inventor
Devaux Lucien
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.)
International Standard Electric Corp
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 US2226698A publication Critical patent/US2226698A/en
Anticipated expiration legal-status Critical
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L21/00—Apparatus or local circuits for mosaic printer telegraph systems
    • H04L21/04—Apparatus or local circuits for mosaic printer telegraph systems at the receiving end

Definitions

  • the present invention provides the control of the printing member by a device employing the properties of piezo-electrlc crystals.
  • vIt is known that by cutting laminations after having provided them witharmatures, bi-la'minal or multi-laminal units are obtained, which bend when differences of potential are applied between the armatures, the direction of distortion depending on the difference of potential.
  • Rochelle salt a double tartrate of potassium and sodium
  • is particularly suitable for this application because, for the same difference of potential it undergoes far greater distortions than other crystals which have been tested.
  • Such a device may be adapted to actuate either a printing stylus, which presses carbon paper on the registering tape or a knife which lifts the paper tape to apply it to a carbon paper or the like Whose other side is resting on a moving point, either a small plate which controls moving styluses, or any other member acting in a similar manner. Any such member may be called a printing hammer.
  • a printing stylus which presses carbon paper on the registering tape or a knife which lifts the paper tape to apply it to a carbon paper or the like Whose other side is resting on a moving point, either a small plate which controls moving styluses, or any other member acting in a similar manner. Any such member may be called a printing hammer.
  • the amplitude of the movement of a piezoelectric crystal is generally too low for it to be possible to control the printing member directly, but the pressures obtained being great it is possible to amplify the movement by mechanical means, such as a lever or by other arrangements such as pneumatic devices.
  • FIG. 1 illustrates schematically an arrangement in accordance with the invention
  • Fig. 2 illustrates a form of control circuit in accordance with the invention.
  • Fig. 1 of the accompanying drawing shows schematically the embodiment of a printing arrangement in a telegraph receiver.
  • the piezoelectric receiving unit I is formed of several superposed strips; it is square in shape and supported at three of its corners by means of elastic plates, 2, such as rubber.
  • the plates are cut in such a way that in applying a difference of potential between the armatures 3 and 4 the strips bend in such a way that the free corner 5 is displaced along a line perpendicular to the plane of the strips.
  • This corner is assembled with a small rod 6 which actuates a lever I pivoting round an axis 8. The other end of the lever is provided with the member serving for printing.
  • a small hammer 9 strikes on the styluses I0, ll, l2, l3, l4, l5, I6 carried by a carriage I1, and serves to press an inked ribbon I8 on a paper band l9.
  • the carriage I! is moved by an alternative movement which is synchronised with the transmission in such a way that the styluses Ill-l6 pass through parallel lines, and according to the action of the hammer 9 trace dots or dashes whose arrangement forms theletters.
  • the carriage I1 may be reciprocated by means of a cam on a shaft released for one rotation at the commencement of receipt of impulses representing a character.
  • the movement of the lever may be doubled without increasing the constraint of the crystal.
  • the receiving circuit may be arranged so that in the normal condition the crystal is polarised in one direction and that the reception of the signals produces a polarisation of opposite sign and of the same value.
  • An example of such a circuit is given in Fig. 2 of the accompanying drawing.
  • the piezo-electric crystal 20 is connected in the diagonal of a Wheatstone bridge two branches of which are formed by two equal resistances 22 and 23, and the two other branches of which are formed by two electron tubes 24 and 25.
  • the grid of tube 24 is normally strongly polarised so that the resistance of the tube is considerable, and on the other hand the grid of tube 25 is neutral and the resistance of the tube 25 is low.
  • the crystal is thus polarised in one direction.
  • diodes 26 and 21 Included in the grid circuits of tubes 24 and 25 are diodes 26 and 21 respectively, and these circuits are connected to the last tuned circuit 28 of the receiving station in such a way that a received impulse makes the grid of tube 24 become negative.
  • the bridge is thus unbalanced in the inverse direction and the polarisation of the piezo-electric elements is reversed.
  • a printing telegraph receiver adapted to record signals by marks representing the various characters in accordance with received signal impulses, comprising a plate built up of a plurality of laminations each cut from a crystal piezo-electric material, means for applying received signal impulses to opposite sides of said plate to cause said plate to deform, and a printing hammer cooperating with said plate actuatable in response to the deformation of said plate for recording said received signals.
  • a printing telegraph receiver adapted to record signals by marks representing the various characters in accordance with received signal impulses, comprising a plate of piezo electric material, means for applying received signal impulses to opposite sides of said plate to cause said plate to deform, a printing hammer cooperating with said plate actuatable in response to the deformation of said plate for recording said received signals, a carriage mounted for cooperation with said printing hammer, and a plurality of 3 styluses mounted in said carriage for selective positioning with respect to said hammer, whereby operation of said printing hammer in accordance with received signal impulses serves to build up representation of said characters through operation of said styluses.
  • a printing telegraph receiver in accordance with claim 1 further comprising means for normally polarizing said plate in one direction, in which said received impulses produce polarization of said plate'in the opposite direction.
  • a printing telegraph receiver comprising a Wheatstone bridge arrangement, thermionic tubes in adjacent arms of said Wheatstone bridge arrangement, resistance elements in the other arms of said bridge, means for normally biasing said thermionic tubes so that one of said tubes presents a low resistance and the other of said tubes represents a high resistance, a plate of piezoelectric material bridged across one diagonal of said Wheatstone bridge circuit, a telegraph signal recording means cooperating with said plate, and a receiving circuit connected with said thermionic tubes for reversing the biasing effect on said tubes in response to received signal impulses.
  • a printing telegraph receiver for comprising elastic members for supporting said built-up plate at three of its corners whereby a fourth corner is capable of vibrating along a line substantially perpendicular to the plane of the plates, and a lever having one end in engagement with said fourth corner and the other end provided with said printing hammer.
US150466A 1936-06-29 1937-06-26 Printing telegraph apparatus Expired - Lifetime US2226698A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR681442X 1936-06-29

Publications (1)

Publication Number Publication Date
US2226698A true US2226698A (en) 1940-12-31

Family

ID=9022803

Family Applications (1)

Application Number Title Priority Date Filing Date
US150466A Expired - Lifetime US2226698A (en) 1936-06-29 1937-06-26 Printing telegraph apparatus

Country Status (6)

Country Link
US (1) US2226698A (fr)
BE (1) BE422274A (fr)
DE (1) DE681442C (fr)
FR (1) FR819843A (fr)
GB (1) GB476922A (fr)
NL (1) NL49754C (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2457133A (en) * 1941-10-18 1948-12-28 Int Standard Electric Corp Fragmentary character printer
US3409904A (en) * 1966-12-20 1968-11-05 Motorola Inc Printer having piezoelectric crystal printing means

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2716618A1 (de) * 1977-04-15 1978-10-19 Triumph Werke Nuernberg Ag Mosaikdruckkopf
DE3329896C2 (de) * 1983-08-18 1986-02-20 Rainer Dipl.-Ing. 2000 Hamburg Kaufmann Druckelement für Nadeldruckvorrichtungen

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2457133A (en) * 1941-10-18 1948-12-28 Int Standard Electric Corp Fragmentary character printer
US3409904A (en) * 1966-12-20 1968-11-05 Motorola Inc Printer having piezoelectric crystal printing means

Also Published As

Publication number Publication date
NL49754C (fr)
BE422274A (fr)
GB476922A (en) 1937-12-17
FR819843A (fr) 1937-10-27
DE681442C (de) 1939-09-22

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