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Publication numberUS3688035 A
Publication typeGrant
Publication dateAug 29, 1972
Filing dateMay 28, 1970
Priority dateMay 28, 1970
Also published asCA956588A, CA956588A1
Publication numberUS 3688035 A, US 3688035A, US-A-3688035, US3688035 A, US3688035A
InventorsCless Gerhard
Original AssigneeTeletype Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Teleprinter type selection and assembly therefor
US 3688035 A
Abstract
Driveable type dies of a teleprinter are supported in intersecting rows and columns from a type carrier which is arranged for adjustment in intersecting paths at successive stations to which the carrier is moved for presenting any selected die in a position for character reproduction. Adjustment and movement of the carrier and translocation of an impeller to successive printing stations for driving successively selected dies between print and non-print modes results from magnetomotive phenomena generated by a linear electric motor.
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wanted States Patent Cless [54] TELEPRINTER, TYPE SELECTION AND ASSEMBLY THEREFOR [21] Appl. No.: 41,485

[52] US. Cl. ..178/33 R, 310/13 [51] int. Cl. ..H04l 17/30 [58] Field of Search ..l78/33 R, 35, 23 R; 310/13,

[ Aug. 29, 1972 57] ABSTRACT Driveable type dies of a teleprinter are supported in [72] inventor: Gerhard Cless, Skokie, Ill. intersecting rows and columns from a type carrier [73] Assigneez Teletype Corporation, Skokie, m. which is arranged'for adjustment in intersecting paths at successive stations to which the carrier is moved for [22] Flledi May 1970 presenting any selected die in a position for character reproduction. Adjustment and movement of the carrier and translocation of an impeller to successive printing stations for driving successively selected dies between print and non-print modes results from magnetomotive phenomena generated by a linear electric motor.

In the magnetic flux field of the motor, a pair of Reierences Cited mechanically coupled electrical coils are adapted UNITED STATES PATENTS magnetomotively to produce (1) vertical adjustment of an output member to WhlCl'l the carrier is secured 3,369,163 2/1968 Peterson et al ..3l8/162 and in a path corresponding to type row adjustment, 3,422,945 1/1969 Bethune ..178/33 RX (2) horizontal adjustment of a trolley from which the 32322331- 312333 5235i?f??l:.1111111111513i?f Output member is adjustably carried and in a Path Primary Examiner-Kathleen H. Claffy Assistant ExaminerThomas W. Brown Attorney-J. L. Landis and R. P. Miller responding to type colunm adjustment and (3) horizontal stepping movement of said trolley to successive printing stations. A magnetomotive force, which a third electrical coil of the motor is adapted to induce, steps the impeller to successive printing stations.

25 Claims, 5 Drawing Figures CHARACTER GENERATOR n22 124 42 9a COLUMN COUNTER 94 DELAY IMPELLER PATENTEU I973 3,688,035

sum 1 0r 2 INVENTOR GERHARD CLESS ATTORNEY TELEPRINTER TYPE SELECTION AND ASSEMBLY THEREFOR FIELD OF THE INVENTION BACKGROUND OF INVENTION Llu A teleprinter adapted as a terminal is often associated with an intelligence storage or bank for intelligence translation. Conventionally, a teleprinter has a carrier for dies of a plurality of symbols or characters from which selection is made for printing. The dies are arranged selectively to be driven at a printing station by an impeller into a printing mode.

v In one class of teleprinters, the web on which intelligence is reproduced is immobilized from horizontal shifting during printing. To effect printing then, the impeller is adapted for translocation in steps to successive adjoining horizontally aligned stations. At each successive station a selected die is presented; and to that end means are adapted for moving the die carrier to successive stations and 'for adjusting the carrier to align a selected die with the impeller.

In the art of intelligence recovery, significant resources have been and currently are being invested to increase the speed of intelligence reproduction to maximize the availability of intelligence bank or storage facilities or the intelligence contained therein. Production costs of improvements which heretofore have been developed parallel increase in the speed of intelligence reproduction achieved thereby and accordingly, tend to limit exploitation of the innovations.

It is an object of the present invention rapidly to translate intelligence.

It is another object of the invention to minimize the cost of intelligence translation.

It is yet another object of the invention to provide an improved motor.

It is a further object of the invention to provide an improved terminal for a data storage system.

Moreover, it is an object of the invention to provide an improved teleprinter and method of printing.

SUMMARY OF THE INVENTION To effect the foregoing and other objects which shall become apparent from ensuing description, the present invention has adapted for teleprinters a transducer similar to the type, specific other embodiments of which are described and claimed in two contemporaneously filed applications which have been assigned to the assignee of the present application and are herein incorporated by reference and are further identified as follows: (1) Ser. No. 41,486, now US. Pat. No. 3,641,583 of the present application and Jerome L. DeBoo, titled Electrodynamic Transducer and (2) Ser. No. 41,335 of Allan G. Wallskog, titled Type Carrier Assembly. That is to say, in a teleprinter, a plurality of dies which comprise its printing means are supported in a plurality of rows and columns from a carrier which is moveably arranged for disposition at a printing station.

A linear electric motor with a combination output having axial components in a plurality of dimensions is adapted for adjusting the carrier to present any selected die at the printing station.

From another aspect, the foregoing objects are achieved according to the invention summarized as aforesaid with means for moving any selected die between passive and printing modes and additional means associated with the motor for translocatin'g said moving means to successive printing stations.

From yet another aspect, said objects are achieved by providing a motor which is adaptable for a teleprinter. The transducer is characterized by an assembly of first and second members arranged for relative and simultaneous movement in a pair of lineal transversely extending paths; Electrodynamic means and mechanical means associated in input-output relationship with said assembly are adapted for translating power in one form to power in another. Thereby, through the use of electricity, a type box can be moved to any selected station for printing.

BRIEF DESCRIPTION OF THE DRAWINGS In the ensuing detailed description, reference is had to the accompanying drawings on which:

FIG. 1 is a perspective view of the invention em- I bodied in a teleprinter and looking toward the front DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENT Having reference now more particularly to the accompanying drawings, a teleprinter, only sufficient of which is shown to illustrate the invention, is generally designated 10. The teleprinter comprises a platen 12 which may be of conventional construction and cylindrical configuration and is immobilized from lateral or horizontal shifting. The platen is adapted for supporting a web 14 (FIG. 3), such as paper or the like on which intelligence is reproduced, and is rotatable about its longitudinal and horizontally extending axis for shifting the web vertically a line at a time in a conventional manner. Means (not shown) which may be conventional are arranged for supporting an inked ribbon l6 longitudinally of the axis of platen 12 and spaced slightly forwardly of the web.

A box or carrier 18 is disposed slightly forwardly from ribbon 16; and is arranged for movement horizontally, longitudinally of the axis of platen 12. The carrier supports a font of type or dies 20 (FIG. 1) which are arranged in horizontal rows 19 and in vertical columns 21 only some of which are numbered. In accordance with conventional practice, the dies may be faced with alphanumeric characters and selected other designs or symbols; and each has an exposed shank 22 which extends forwardly (to the right in FIG. 4) from the carri- By means not shown, each of the dies 20 is biased or urged forwardly to a non-print or passible mode in which its printing face is spaced slightly forwardly from ribbon 16. However, each die is mounted for movement horizontally transversely of the axis of platen 12 between its passive or non-print mode and a print mode in which it has been driven rearwardly against its normal bias into contact with ribbon 16 for printing in a conventional fashion on web 14.

Means for moving any selected of dies 20 between passive and printing modes comprises an impeller or solenoid 24 whose driven member terminates in a print hammer or striker 26. The latter is normally biased or urged to a withdrawn or forward position and is arranged for movement in a path coincident with the path of movement of a selected die. Moreover, the dimensions of the striker are such that when the impeller is actuated only a selected die will be driven toward a print mode.

Carrier 18 is arranged for adjustment vertically as well as horizontally; and the parts are proportioned such that at any adjusted position a single one of the dies 20 will be disposed suitably for printing at a printing station. Teleprinter includes a printing station which moves horizontally a space at a time, whereby a succession of symbols can be formed to print a line of intelligence. Accordingly, impeller 24, the position of which defines a printing station, is arranged for successive horizontal movements.

In accordance with the present invention, a linear electric motor, generally designated 28, comprises means for adjusting carrier 18 along a vector having values referable to a pair of orthogonal coordinates (herein being vertical and horizontal) in a planar or two axes system to select a die for printing. Moreover, said motor comprises means for moving said carrier to successive printing stations; and'said motor also comprises means for translocating impeller 24 to successive printing station simultaneously with movement and adjustment of carrier 18.

Motor 28 is comprised of a permanent magnet 30 and a magnet loop defining a magnetic circuit. The latter is fashioned from a pair of horizontally extending parallel magnetic bars or rails 32 and 34 which are preferably of equal length. They have opposed end portions 36 and 38 which are connected by a magnetic bridge 40 and opposed end portions 42 and 44 which are connected by a magnetic bridge 46. Rails 32 and 34 and bridges 40 and 46 are fabricated from a material of low magnetic reluctance and retentivity, such as soft iron, said rails being magnetic segments in said magnetic circuit between which a non-magnetic or air gap 48 is formed.

As illustrated, the permanent magnet may be a rectangular block which is disposed within the magnetic loop. It is magnetized through its thickness (it North and South poles being conventionally designated N and S) with one of its polar faces secured by a suitable cement to the inner face of rail 32 and its opposite polar face spaced from and parallel to the inner face of rail 34. Thereby, a magnetic flux field is generated across gap 48.

In accordance with the teachings of the aforesaid contemporaneously filed applications, or one of the, a pair of electrical coils 50 and 52, respectively, have coil segments 54 and 56 which are disposed in air gap 48 whereby upon development of an electrical efiect in said coils, they become inductively coupled in the magnetic flux field. Coil 50 is circumposed about rail 34 with the direction of its winding in segment 54 cutting the lines of flux in air gap 48 such that when a current passes through said coil a magnetomotive force is generated impelling coil 50 longitudinally of said rail in a horizontal path defined thereby and parallel to rows 19 of said dies. Segment 56 of coil 52 is disposed in a plane which is parallel to a plane in which segment 54 is disposed. However, the direction of the winding of segment 56 is such that upon the passage of a current I through coil 52, a magnetomotive force will be generated for driving said coil in a vertical path parallel to columns 21 of said dies and normal to the path along which coil 50 is moveable.

Coils 50 and 52 are physically connected through the agency of a coupler fashioned as a trolley 58 such that when coil 50 moves, coil 52 will also move horizontally with coil 50. On the other hand, when coil 52 is caused to move vertically, such movement is independent of movement of coil S0.

Trolley 58 has a body 60 from which are supported a plurality of upper and lower guide rollers 62. They engage a pair of opposed ribs 63 (FIG. 4) fashioned on and longitudinally of the upper and lower surfaces of rail 34 for moving the trolley longitudinally thereof. Coil 50 is rigidly secured to body 60. Thereby, when said coil moves, trolley 58 will be caused to move horizontally and in a direction to or fro, corresponding to the direction of current flowing in said coil.

An output element 64 fashioned as an arm comprises output means mounted from body 60. The output element engages in a plurality of guide bearings 66 which are arranged from said body and define a track for enabling vertical reciprocation thereof. The character and proportions of the parts are such that the output element is frictionally gripped by said bearings and will be retained at any vertical level to which it is driven.

Carrier 18 is secured from the upper end portion of output element 64. Accordingly, an appropriate electromagnetic effect on coil 52 will adjust carrier 18 up or down according to the direction of the current, the horizontal position of said carrier being governed by the position of the trolley.

Means associated with motor 28 for translocating impeller 24 to successive printing stations comprises an electrical coil or winding 68. It is circumposed about rail 34 and has a vertical segment 70 with strands extending transversely of said rail 34 and disposed in air gap 48 such that upon production of an electrical effect in said coil, a magnetomotive force will be generated causing coil movement in a horizontal path longitudinally of rail 34.

A bracket 72 which supports impeller 24 is rigidly secured to coil 68 for translocating said impeller horizontally, parallel to rows 19, the direction of translocation being according to the direction of current flow in said coil. Translocation of the impeller is facilitated by a plurality of upper and lower rollers 74 which are carried from bracket 72 and engage opposed ribs 63 for guiding the impeller longitudinally of rail 34.

Exemplary means for simultaneously adjusting carrier 18 whereby any selected die is disposed at a printing station and for stepping or moving said carrier to successive printing stations and also for correspondingly translocating impeller 24 comprises circuitry 76 (FIG. 5). it comprises signals generating means herein shown as a character generator 78 adapted to produce three electrical outputs, signal or effects which may be generated by known means simultaneously through conductors 80, 82and 84 whenever effects representation of a character to be reproduced are available. The outputs through conductors 80 and 84, respectively, represent the row 19 and column 21 in which a die 20 corresponding to an available character is disposed. Successive outputs through conductor 82 may be identical.

The output through conductor 80 is adapted to adjust or drive carrier 18 vertically; and to that end is connected to a servo amplifier 86. Amplifier 86 has an additional input through a conductor 88 from a suitably mounted feed-back sensor 90 which is adapted to generate a signal according to the instantaneous vertical position of carrier 18. Amplifier 86 is adapted algebraically to add its inputs through conductors 80 and 88 to produce an output for vertically adjusting carrier 18 from any position at which it is disposed to a selected ensuing position for printing such available character.

An output wire 92 connects amplifier 86 to electrical coil 52. Said coil together with coils 50 and 68 are connected to a plane of reference herein shown as ground 94.

The output through conductor 82 is connected to a column counter 96 through a lead 98 for generating a signal in a wire 100 which connects the column counter to a servo amplifier 102. Suitably mounted feed-back means 104, which may be of any well-known construction, generates a signal according to the instantaneous position of impeller 24. It is applied through a lead 106 as an input to amplifier 102 where it is algebraically added to the input through wire 100 for generating an amplifier output through a conductor 108. The latter provides an input to coil 68, whereby for each of a succession of characters, the impeller is moved horizontally one space to an ensuing printing station.

The output of character generator 78 through conductor 82 is also imposed on impeller 24 through a delay circuit 118. Its output is connected to the striker actuating coil (not shown) of said impeller through a conductor 112. The construction of the delay circuit is such that actuation of striker 26 is held in abeyance after a signal indicating character availability for a sufficient period to permit movement and adjustment of carrier 18 and translocation of said impeller.

The output through conductor 84 is adapted to adjust carrier 18 horizontally; and to that end it is connected to an adder 114. The latter is adapted algebraically to add the signal from conductor 84 to an input from column counter 96 through a lead 116. The resultant output signal of the adder thereby considers the column of a selected die and the station at which it is to be printed. A conductor 118 imposes the output signal of the adder as an input to a servo amplifier 120. The amplifier produces an output by algebraically adding said last input to another input through a lead 122 from a feed-back sensor 124 which is suitably arranged for generating a signal corresponding to the instantaneous horizontal position of carrier 18.

' bodiment, adjustment and movement of carrier 18 will Coil 50 is connected to amplifier 128 through a conductor 126. Thereby an effect can be produced for moving and adjusting carrier 18 horizontally such that the column of the character to be reproduced is aligned with striker 26 at an appropriate printing station.

In consequence of the foregoing, through the agency of a linear electric motor with plural outputs, simultaneously electromagnetic forces can be applied tending to adjust and move carrier 18 vertically and horizontally in response to signals representative of: (l) a character to be reproduced and (2) a position of horizontal succession. Thereby, a die corresponding to such character can be aligned at a proper printing station, while impeller 24 is stepped or advanced by an output from said motor from an existing to the next ensuing printing station. Moreover, in the present embe along a path comprised of a pair of values corresponding to intersecting coordinates in a planar two axes system and correlatable to effects which may be generated simultaneously in coils 50 and 52.

As many modifications in the described construction could be conceived, and as many changes could be made therein without departing from the spirit and scope of the claims, it is intended that all matter contained in the accompanying specification shall be considered as illustrative only and not in a limiting sense.

Iclaim:

1. In a teleprinter wherein printing means comprise a plurality of dies supported in intersecting rows and columns from a carrier which is adjustably arranged for presenting any selected die at a printing station in response to a pair of signals derived from signal generating means and corresponding to a row and a column in which a die corresponding to a character to be reproduced is disposed, animprovement comprismeans for producing a magnetic flux field;

a pair of electrical coils disposed in said magnetic flux field for moving said carrier in response to electromagnetic effects corresponding to said signals and generated in said coils;

a trolley arranged for moving said electrical coils in a first path in response to'an electromagnetic effect in one of said electrical coils; and

an output member arranged for reciprocation from said trolley in another path normal to said first path in response to an electrical effect in the other of said coils, said signal generating means producing simultaneous effects in said coils for driving said output member along a path having values relatable to intersecting coordinates in a two axis system.

2. A combination according to claim 1 wherein the producing means comprises a magnetic rail, one of said coils connected to said trolley and'circumposed about said rail, the other of said coils connected to said output member.

3. A combination according to claim 2 wherein said coils have sections with windings extending orthogonally in said magnetic flux field.

4. In a teleprinter wherein printing means comprise a plurality of dies supported in intersecting rows and columns from a carrier which is adjustably arranged for presenting any selected die at a printing station in response to a pair of signals derived from signal generating means and corresponding to a row and a column in which a die corresponding to a character to be reproduced is disposed, an improvement comprismg:

magnetic means having an air gap;

a straight magnetic rail included in said magnetic means and defining a first path parallel to said rows;

a trolley mounted for movement longitudinally of said rail and in said first path;

an electrical coil secured to said trolley and having a section disposed in said air gap for moving said trolley in selected of opposite directions along said first path;

means defining a track carried from said trolley and.

defining another path parallel to said columns;

an output member arranged for reciprocation along said track and in supportive association with said carrier; and

another electrical coil secured to said output member and having a section disposed in said air gap for moving said output member in selected of opposite directions in said other path at each position of said trolley along said rail.

5. In a teleprinter wherein printing means comprise a plurality of dies arranged for movement between print and non-print modes and supported in a plane in intersecting rows and columns from a carrier which is adjustably arranged for presenting any selected die at a printing station in response to signal generating means from which signals are derived corresponding to a row and a column in which a die corresponding to a character to be reproduced is disposed, a combination comprising:

a linear electric motor with first and second elements connected to said generating means, said elements arranged for simultaneous movement in a plurality of dimensions and responsively to said signals for adjusting said carrier to present a selected die for printing;

means for moving any selected die between its nonprint and print modes; and

means for coupling the simultaneous movements of said elements and adjusting said carrier.

6. A combination according to claim having means including an electrical winding magnetomotively connected in said motor for translocating said moving means to successive printing stations.

7. A combination according to claim 6 wherein said translocating means has a member secured to said winding for supporting said moving means and arranged for movement in a path parallel to said rows.

8. A combination according to claim 6 wherein said linear motor comprises means for producing a magnetic flux field and said elements comprise a pair of electrical coils, said coils and said winding magnetomotively coupled in said magnetic flux field.

9. A combination according to claim & wherein said producing means comprises a magnetic rail and has an air gap, and said coils and winding each has a section disposed in said gap.

MB. A combination according to claim 9 wherein said translocating means comprises a trolley connected to said winding and arranged for movement longitudinally of said rail.

terized in that said rail is straight and parallel to said rows.

12. in a teleprinter wherein printing means comprises a plurality of dies supported in intersecting rows and columns from a carrier which is arranged for movement in orthogonal dimensions for presenting any selected die at a printing station and wherein said carrier and means for impelling a selected die between print and non-print modes are mounted'for translocation to successive longitudinally spaced apart printing stations, an improvement comprising:

a linear electric motor with a magnet having a magnetic flux field;

means including a pair of electrical coils and a winding disposed in said flux field for simultaneously adjusting said carrier in two dimensions parallel to said rows and columns and moving said carrier and translocating said impelling means to successive printing stations.

13. A combination according to claim 12 wherein said electrical coils are arranged for moving and adjusting said carrier and said winding is arranged for translocating said impelling means along the path of movement of one of said coils.

114. A combination according to claim 13 further having means for simultaneously generating electromagnetic effects in said coils and said winding.

35. A combination according to claim 14 further having means for coupling said coils, each to the other, for effecting movement of said carrier along a path having values related to intersecting coordinates in a two axes system.

116. A combination according to claim 15 wherein said magnet comprises:

a magnetic rail disposed parallel to said rows and extending along said magnetic flux field; and

said winding arranged for movement longitudinally of and circumposed about said rail and having a section in magnetomotively coupled association with said magnetic flux field for translocating said impelling means responsively to said generating means.

17. A combination according to claim 16 characterized in that one of said coils is arranged for movement longitudinally of and circumposed about said rail with a section magnetomotively coupled in said magnetic flux field for moving and adjusting said carrier in a path parallel to said rows.

18. A combination according to claim 17 characterized in that the other of said coils is arranged for movement in a path transverse to said rail and has a section magnetomotively coupled in said'field for adjusting said carrier in a path parallel to said columns.

1 .9. In a teleprinter wherein printing means comprise a carrier arranged for movement in response to forces applied in orthogonal paths to present any selected die of a plurality of dies mounted on said carrier at each of successive printing stations for movement by an impeller between non-print and print modes and in response to presence of effects representative of a character to be reproduced, the combination comprismg:

means for generating a plurality of signals in response to the presence of said effects;

a linear electric motor responsive to a pair of said signals for simultaneously adjusting said carrier in vertical and horizontal paths;

means responsive to another of said signals for substantially simultaneously moving said carrier and translocating said impeller to successive printing stations; and

means responsive to said other signal for actuating said impeller to move a selected die at a printing station. I

20. A combination according to claim 19 wherein said actuating means includes a time delay for impeller actuation following movement of said carrier and translocation of said impeller.

21. A combination according to claim 19 wherein said carrier moving and impeller translocating means comprises a winding magnetomotively associated with said motor for translocating said impeller and a column counter connected to said generating means for utilizing said other signal to generate an electromagnetic effect in said winding.

22. A combination according to claim 21 further characterized by a coil magnetomotively associated with said motor for adjusting said carrier in one direction for character selection and means for adding one of said plurality of signals and another signal from said column counter to generate an effect in said coil for simultaneously moving said carrier to successive stations during carrier adjustment.

23. An improved printing method of the type wherein a plurality of dies are arranged in intersecting rows and columns on a carrier which is adjustably arranged for presenting any selected die at a printing station in response to a pair of electrical signals corresponding to a row and column in which a die corresponding to a character to be reproduced is disposed, wherein the improvement comprises:

applying the signals, separately, to a pair of electrical coils magnetomotively disposed in a flux field to move the coils along linear perpendicular axes in selected directions and through selected distances governed individually by the two signals; and moving the carrier along linear perpendicular axes in response to the movement of the coils to align a selected die at the printing station. 24. A method as recited in claim 23, wherein each of the dies is mounted for movement between print and non-print positions, and each selected die is driven to the print position by a print hammer, the method further comprising the steps of:

translocating the print hammer to successive printing stations in response to a third electrical signal; and

actuating the print hammer in response to one of the electrical signals after the carrier and hammer have been positioned at the printing location.

25. A method as recited in claim 24, wherein:

the translocating step comprises applying the third signal to a third electrical coil magnetomotively disposed in the flux field to move that coil in steps along a linear axis parallel to one of the axes of the carrier, the hammer being coupled to the third coil for movement therewith.

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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3867675 *Aug 13, 1973Feb 18, 1975Bell Punch Co LtdMagnetic drive mechanisms for printing heads
US3899699 *May 28, 1974Aug 12, 1975IbmBrushless linear DC motor actuator
US4012676 *Feb 13, 1974Mar 15, 1977Siemens AktiengesellschaftDevice for driving recorders and printing carriages in data recorders
US4044881 *Apr 13, 1976Aug 30, 1977International Business Machines CorporationSerial printer with linear motor drive
US4185836 *Jun 14, 1978Jan 29, 1980Plessey Handel Und Investments AgDisc record player
US4364681 *Jun 19, 1980Dec 21, 1982Compagnie Internationale Pour L'informatique Cii-Honeywell BullPrinter having a linear motor
US4710042 *Apr 23, 1986Dec 1, 1987Ta Triumph-Adler AktiengesellschaftMethod and apparatus for indexing the print hammer of typewriters or the like
US4835643 *May 19, 1987May 30, 1989Microscience International CorporationDisk drive head actuator coil
DE2715258A1 *Apr 5, 1977Oct 27, 1977IbmSerien-zeilendrucker
DE3041170A1 *Oct 31, 1980May 21, 1981Printronix IncLinearantrieb, insbesondere fuer schnelldrucker
Classifications
U.S. Classification178/33.00R, 310/13, 400/322
International ClassificationB41J19/20, H04L17/30, H04L17/00, B41J7/00, B41J7/60, B41J19/30
Cooperative ClassificationB41J7/60, B41J19/305, H04L17/30
European ClassificationB41J7/60, B41J19/30B, H04L17/30
Legal Events
DateCodeEventDescription
Mar 11, 1985ASAssignment
Owner name: AT&T TELETYPE CORPORATION A CORP OF DE
Free format text: CHANGE OF NAME;ASSIGNOR:TELETYPE CORPORATION;REEL/FRAME:004372/0404
Effective date: 19840817