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Publication numberUS3831728 A
Publication typeGrant
Publication dateAug 27, 1974
Filing dateDec 11, 1972
Priority dateDec 11, 1972
Also published asCA1000343A1, DE2361237A1, DE2361237C2
Publication numberUS 3831728 A, US 3831728A, US-A-3831728, US3831728 A, US3831728A
InventorsWoods J, Yosmali K
Original AssigneeIbm
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Ink jet printing apparatus with overrun of printhead to insure better visibility
US 3831728 A
Abstract
An ink jet printing apparatus has provision for both line printing and character-by-character printing. A directionally oriented grating and associated circuitry is provided to maintain a record of character and ink drop printing locations. Also, provision is made for over-shooting the printhead some distance past each character printed during an incremental mode and for stopping the printhead to enable better visibility of the character just printed. Upon printing of the next character, the printhead first moves to the left a sufficient distance to get past the character box to be printed and sweeps to the right with the overshoot and stopping as before.
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United States Patent [191 Woods et al.

[11] 3,831,728 [451 Aug. 27, 1974 INK JET PRINTING APPARATUS WITH OVERRUN OF PRINTIIEAD TO INSURE BETTER VISIBILITY Inventors: Joe W. Woods; Krikor Yosmali,

both of Lexington, Ky.

Assignee: International Business Machines Corporation, Armonk, NY.

Filed: Dec. 11, 1972 Appl. No.: 313,886

US. Cl...... 197/1 R, 346/75, 197/19, 197/66 Int. Cl. G0ld 15/18 Field of Search 10l/DIG. 13; 346/75, 140, 346/] R; 197/1 R, 19, 60, 62, 63-66, 68;

. References Cited UNITED STATES PATENTS Stone et a1 346/75 3,595,994 7/1971 Whitman 346/75 X OTHER PUBLICATIONS A. B. Dick, Videojet Printer, Techn. Description, 4 -12-71.

Primary ExaminerRobert E. Pulfrey Assistant Examiner-E. H. Eickholt Attorney, Agent, or FirmD. Kendall Cooper [57] ABSTRACT An ink jet printing apparatus has provision for both line printing and character-by-character printing. A directionally oriented grating and associated circuitry is provided to maintain a record of character and ink drop printing locations. Also, provision is made for over-shooting the printhead some distance past each character printed during an incremental mode and for stopping the printhead to enable better visibility of the character just printed. Upon printing of the next character, the printhead first moves to the left a sufficient distance to get past the character box to be printed and sweeps to the right with the overshoot and stopping as before.

3 Clairm, 8 Drawing Figures PAIENIEMI 3.831.728

sum ior 4 Pmmenwm w 3381.128

sum aor 4 v FIG. 3a

v f 1 I POWER on RESET PRINT CHARACTER K D/AI- LINES lNKJE-T 122 v HEAD READY CHARACTER smc. CLOCK GENERATOR BLM-IK/UNBLANK {56 LPROCESSOR ZMAGNEHC NEXT END OF CHARACTER I CARD UNIT {25 /i57 PRINT i59b- CHARACTER LINES 26 A58 CLOCK CLOCK R 1590 NUMERIC PRINTER Q I i 1 START OF. SCAN NEXT CLOCK v 128 fF-lG.3b

1 50 1e0 461 CHARACTER LINES I FEEDBACK PR'NT i' g f g MECHANICAL MAGNETS, PRINTER READY 3 FUNCTIONS SPECIAL MECHANICS 154 LOGIC cmcuns PRINT v conPARE 1 3 or CHARACTER T I 156 DOWN COUNT LOGIC AMPLIFIER AMPLIFIER RELATED PATENT APPLICATION US. Patent application Ser. No. 313,919 entitled, Ink Jet Printing Apparatus with Line Sweep and Incremental Printing Facilities, filed Dec. 1 l, 1972 and having Raymond L. Fowler, et al, as inventors.

BACKGROUND OF THE INVENTION AND PRIOR ART The Rossetto patent describes photocomposing apparatus making use of a grating for determination of character increments. The Stabler patent describes a shaft position indicator for recognizing direction of rotation of a shaft and having an associated counting means. The Woodhead patent describes a counter for keeping track of printer position.

The Sims patent describes a power typing system incorporating an IBM Selectric printer with an associated magnetic tape storage unitwith recording and reading facilities; Line readjustment capabilities are" also described. The Locklar, et a1, patent describes an apparatus similar to the Sims system with provision for selection of information on a character, word, and line basis. The Jones, et al, patent describes an automatic typing system incorporating an IBM Selectric" Typewriter together with an associated magnetic card storage unit having recording and reading facilities. The Hayes patent describes an electrical keyboard unit.

The Burdick, et al, and Dorius, et al, publications described Reed Switch Assemblies.

The various IBM Customer Engineering Manuals describe the Selectric printer,,the Selectric" Model 11 printer, and the Selectric" printer and magnetic card unit in the IBM MC/ST.

REFERENCES or INTEREST The following U.S. Pat. Nos. are of general interest: Rossetto, et al, Reissue 25,354; Stabler, 2,656,106; Woodhead, 2,954,860; Sims, 3,297,124; Locklar, et al, 3,260,340; Jones, et al, 3,512,137; Hayes, et al, 3,494,550. j

The following IBM publications are of interest:

"Reed Switch Contact Block,authors, R. L. Burdick, et al, IBM Technical Disclosure Bulletin, October 1966, page 512.

Toggle and Momentary Reed Console Switch Assembly, authors, L. F. Dorius, et al, IBM Technical Disclosure Bulletin, May 1967, pages 1,702 and 1703.

The following IBM Customer Engineering Manuals are of interest:

Selectric" Printer Instruction Manual, January, 1966, Form No. 241-5032.

Selectric" Typewriter, Service Manual, November, 1970, Form No. 241-5615. I

Selectricll Typewriter, Service Manual Supplement, Form No. 241-5615 (Supplement).

Magnetic Card Selectric Typewriter, Self Teach Course Summary, July, 1969, Form No. 241-5581.

Magnetic Card Selectric Typewriter, Self Teach Instruction Manual, Vol. 11, June, 1969, Form No. 241-5580.

Parts Catalog, Magnetic Card Selectric Typewriter, August, 1969, Form No. 241-5584.

Pictorial Reference/Adjustment Manual, Magnetic Card Selectric Typewriter, July, 1969, Form No. 241-5593.

SUMMARY OF THE INVENTION The present ink jet printing system has provision for both line printing and incremental printing with structures involving considerably less hardware than some other printing apparatus. As an example, with the present system, the escapement rack, backspace rack, escapement and tab bracket assembly, escapement triggering device and associated hardware including the tab torque bar is eliminated. The carrier motion is accomplished by actuation of'carrier return and tab solenoids in correct'timeintervals. A single character is printed under control of the electronics which senses a grating for positioning of the character to be printed. The grating has two sets of markings displaced from one another and an associated counter circuit keeps track of carrier location in relation to a document to be printed by counting up and down as appropriate.

Provision is made to insure improved visibility of the printing line during printing operations, particularly when printing is performed on a character-bycharacter basis.

OBJ ECTS Accordingly, a paramount object of the present invention is to provide an ink jet printing apparatus having line and incremental printing capabilities.

Another object of the present invention is to provide a directionallyvoriented grating and associated counting circuitry for maintaining character and drop locations during printing operations.

A further object of the present invention is to establish improved visibility of the printing line during printing operations.

The foregoing and other objects, features, and advantages of the invention will be apparent from the following more particular description of the preferred embodiment of the invention as illustrated in the accompanying drawings.

DRAWINGS In the Drawings:

FIG. 1 illustrates an ink jet printing system incorporating a printer and having an associated magnetic card recording/reproducing unit with both line printing and character-by-character printing facilities.

, FIG. 2 illustrates various carrier motions encountered during incremental printing.

FIG. 3a is a block diagram of the ink jet printing apparatus of FIG. 1 showing a number of significant control lines and possible data sources. FIG. 3b is a block diagram illustrating some of the printer mechanical signals involved.

FIG. 4 illustrates structures in the ink jet printer head assembly with associated grating.

FIG. 5a illustrates a sensor assembly useful with the grating shown in FIG. 4, while FIG. 5b illustrates a sensing circuit fulfilling an amplifier function.

FIG. 6 illustrates various mechanisms involved in producing relative motion of the ink jet head assembly and carrier in relation to a document to be printed.

DETAILED DESCRIPTION FIG. 1 illustrates an ink jet printing system incorporating a typewriter 1 with an associated magnetic card recording/reproducing unit 2. Card unit 2 is shown for convenience only since by inspection of FIG. 4a, it is apparent that other kinds of storage units, recording- /reproducing units, and the like, may be used in the system. Typewriter 1 has the usual keyboard 2 which preferably is of the electrical type referred to in some of the IBM Customer Engineering Manuals listed previously. It may also be of the type described in the Hayes. et al, patent. Printer 1 incorporates an ink jet head assembly 4 arranged for travelling movement from left to right (and conversely) adjacent a document 7 to be printed. Assembly 4 has an ink drop nozzle and an associated gratingS with an upper incremental column location scale and a lower character scale as shown in greater detail in FIG. 4. Printer 1 may be provided with various control buttons 10, 11, 12 and 13 for automatic, line, word, and character printing, respectively. Other keybuttons 15-18 concern mode selection, that is, record, playback, adjust, and skip, respectively.

Reference is made to the various Selectric" typewriter manuals referred to previously for description of other keyboard facilities and other features of the printer. The magnetic card unit 2 has a load slot 25 and a track indicator 26. Also provided on unit 2 is a card eject button 27, a track stepdown button 28 and a track stepup button 29 for relocating the scanning transducer with respect to the various tracks on the card. Reference is made to the various magnetic card manuals and the Jones, et al, patent for a description of facilities in the card unit. It is understood, of course, that other kinds of storage facilities, card units, tape units, processors, and the like can be substituted for unit 2 including as an example, the magnetic tape unit set forth in the Sims and Locklar, et al, patents.

Printer 1 incorporates a left margin reed switch 30, a drop carrier return reed switch 31 and a right margin reed switch 32. These may be of the type set forth in the Burdick. et al, and Dorius, et al, publications.

FIG. 2 illustrates the mechanical motion of the carrier in relation to the character boxes during predominately incremental, that is, character-by-character printing. Reference is also made to FIGS. a and 5b which shows the grating, sensing, and counting circuits. Referring to FIG. 2, character zones or boxes designated A thru H are shown. It is assumed that the printer is in the incremental mode of printing as determined by appropriate depression of keybutton on the keyboard of the printer. Initially, it is also assumed that carrier 5 and head assembly 4 are located at the stop position 1000 in the printing motion line 100. It is seen that carrier 5 and head assembly 4 are actually past the character location A that is the next one to be printed. Upon initiation of printing of a character as by depression of a keybutton in keyboard 3, various mechanisms to be described are activated to move carrier 5 and head assembly 4 to the left along line portion 100]; to a point represented at 1001' prior to character box A. Thereafter, the mechanisms are operable to sweep head assembly 4 and carrier 5 to the right along line 100d ultimately to a stop location 100a in readiness for the next character. As the assemblies 4 and 5 pass through character box A, appropriate signals are developed to propel ink drops toward document 7 in order to print the character required in character box A. No printing occurs in boxes B, C, or D.

The foregoing motions and movement of structures 4 and 5 occur for the printing of the subsequent characters in boxes B, C, D, etc., with the exception that in the case of characters D and E, continued movement of carrier 5 and head assembly 4 occurs. This is assumed to be due to the fact that the signals necessary for formation of the characters in those boxes are provided to the system during the latter portion of the character box D so that the printer need not stop but may continue on and print the characters in character boxes D and E.

SYSTEM BLOCK DIAGRAM FIG. 3a is a system block diagram incorporating a processor, card unit, tape unit 110, or the like and having various control lines -128 interconnected with a character generator box and printer control circuits 131. Other lines 134-141 interconnect the character generator 130 and printer 131 with the head assembly 4.

In FIG. 3b the logic representing various mechanical functions has inputs on lines 151-156 providing control for various operational circuits and ultimately to the printer mechanisms 161 with feedback on line 163.

Referring to FIG. 4, various structures incorporated in head assembly 4 are illustrated. This includes a pump 40 for directing ink from an ink supply conduit 41 on demand as a crystal 42 is energized, that is, pulsed at high frequencies. The rate of impulsing crystal 42 may be in the range of I00 kiloHertz for example. Ink drops are emitted from nozzle 43 and pass through a charge electrode 44 for variable charging in accordance with the output of a charge amplifier to deflect the drops in a column an amount representing the vertical height of the drop location in any given character. As illustrated the letter capital S designated 50 comprises a number of vertical columns 51. The printing is such that a sequence of vertical columns, each comprising a plurality of drops, such as 40 in number, is propelled from nozzle 43 toward document 7 for the printing of the character involved. If drops are not required for printing, they are directed to a gutter 53 for passage by means of a conduit 54 back to the ink supply, customarily. A pair of deflection plates 60 and 61 is positioned in the path of travel of the drops leaving the charge electrode 44. A constant high potential is applied across plates 60 and 61 and this in cooperation with the variable charge on the individual drops determines the amount of deflection as the drops are directed toward document 7. Grating 8a in this instance is shown as being positioned horizontally rather than vertically as in FIGS. 1 and 5a, but the positioning is immaterial.

Mounted on head assembly 4 for translational movement adjacent grating 8 is a sensor assembly such as that shown in FIG. 5a. This comprises a supporting structure 30 incorporating a light emitting diode 32 arranged to direct light thru grating 8 and a master grating 33 to a pair of solar cells 34 and 35. Grating 8 has the two portions 8a and 8b.

Grating 8 is typically of a stiff transparent base and is guided through a slot in the assembly body to maintain a reasonably constant proximity to master grating 33.

Master grating 33 is mounted to the face of the solar cells 34 and 35. Master grating 33 is arranged in such a manner that the DC. output signals of the two cells cancel while the AC. signals are additive. This is accomplished by making the grating lines of one cell l80out of phase with respect to those of the other cell. The purpose is to reduce the effects of light level shift which may occur from aging or voltage change on the light emitting diode.

The two channels, as described above, produce signals that have a 90phase relation skip. This is to permit up-down counting. One channel, FIG. b, comprises cell 34 coupled through amplifier 70 to And-Invert (AI) block 71, while the other channel comprises cell 35 coupled through amplifier 73 to And-Invert 74. Outputs of Al blocks 71 and 74are provided to up-down counter logic 75 with outputs at 76 being used to determine print-head location.

As indicated, the individual characters are located within character boxes comprising perhaps 40 drop cations in height and 24 drop locations in width, that is 24 columns wide.

If it is assumed'that the printer 1 is in a line mode and the system is in a playback mode, appropriate positioning of a card, not shown, results in card unit 2 furnishing signals to the printer 1 to determine the printing of characters. An output indicating print is provided and remains at an up level until an end of line signal is received from the card unit.

As indicated on charge electrode 44, FIG. 4, the charge determines at what drop location a drop will ultimately arrive within a given column of drops in the character box on document 7. If no drop is required, that is, it is to be directed to gutter 53, FIG. 4, then a blank signal results in no charge on the drop and it lands in gutter 53.

TRANSPORT MECHANISMS FOR RELATIVELY MOVING CARRIER AND DOCUMENT tached on either side of carrier 5 is a cable 201 that is illustrated as passing around pulleys 205-208 in FIG. 6. Cable 201 is wound on a cord drum 210. Cord drum 210 is mounted on an operational shaft 21]. Associated with drum 210 is a hub member 212, fixedly mounted therewith and another hub member 213. The entire assembly of elements 210, 212, and 213 being freely mounted on shaft 211. Surrounding hub member 212 is a spring element 216 forming part of a spring clutch assembly 218 while surrounding a portion of hub member 213 is a spring element 220 forming part of a spring clutch assembly 221, which disengages the planetary gear system during carrier return operations to prevent gear noise. Clutch assembly 218 is involved in carrier return operations, that is, movement of carrier 5 from right to left in printer 1 while spring clutch 281 is involved in a governing action when carrier 5 is moved from left to right in the tab or forward spacing direction.

Other primary structures associated with the transport mechanisms include the main spring 230, the backspace clutch assembly 231 and associated elements arranged in a train for mechanical control designated 232, an index assembly 233, and a tab governor 234. i

It is assumed that carrier 5 is at the left margin location indicated by reed switch 30. If printing of a line is desired, a backspace operation is first anticipated by arm 231 and pawls 241 and 242 shown more particularly in FIG. 6 are disengaged from ratchet 243. This enables driving movement by main spring 230 through hub member 213 and cord drum 210 to pull cable 201 and carrier 5 in a direction from left to right in relation to document 7. Movement of carrier 5 continues until a line ending code is received from the data source or reed switch 32 is encountered indicating the right margin. Thereupon, a carrier return drive is initiated, when motor 250 is coupled through hub element 212 and cord drum 210 by engagement of spring element 216 of clutch assembly 218 by means of a shoe 255 activated by carrier return magnet 256. Accordingly, carrier 5 is moved from right to left in the carrier return direction until left margin switch 30 is encountered indicating termination of the carrier return operation. While the carrier is in operation, main spring 230 is being wound up in preparation for escapement and tabulation movements in a succeeding line.

INCREMENTAL PRINTING If printing of information is required on a characterby-character basis, then motion of the carrier and associated head assembly 4 is as shown and'discussed previously in connection with FIG. 2a. Referring to FIG. 2a, it is assumed that carrier 5 has stopped at point 100a.

The logic is operative to initiate a backspacing operation of 0.3 inch corresponding to three characters, assuming a 10 pitch character increment. The backspacing operation is initiated by energization of the backspace clutch 231, which by means of actuator 260 moves an arm assembly 261 pivotally mounted on pivot 262. The. arrangement is such that portion 261a moves into the figure, that is, away from the viewer, while portion 261]) moves upwardly from the surface of the figure, that is, toward the viewer. The motion of member 261 is such that pawl 242 moves ratchet 243 in a mum terclockwise direction when viewed from the right end of shaft 211. Ratchet 243 is directly associated with cord drum 210 and this effects movement of carrier 5 three character spaces back to point 100C in FIG. 2a.

Thereafter, escapement magnet 240 is energized to release ratchet 243 so that cord drum 210 may be moved in a clockwise direction as viewed from the right end of shaft 211 under influence of main spring 230.

During any tabulation movement under influence of main spring 230, speed of the movement is controlled by the tab governor 234 by means of a planetary gear assembly 270 including a ring gear 271, a planetary gear 272 and a sun gear 279. The control is exerted through the spring clutches 221 and 280 as well as governor 234 to insure that excessive speeds are not encountered.

With activation of main spring 230, and rotation of cord drum 210, carrier 5 and head assembly 4 move in a left to right direction as illustrated by portion 100d in FIG. 2a with the electronics controlling the printing of a character in character box A as required taking into account the character and columnar positions of ink drops by monitoring counter during movement of carrier 5. Escapernent magnet 240 is de-energized in time for the carrier to stop at point 100e, FIG. 2a.

Succeeding characters are printed in the incremental mode in this manner as long as required.

It is evident by inspection of FIG. 2a that with carrier 5 and head assembly 4 displaced a considerable distance to the right past any character location that has just been printed, visibility is quite improved and the character just printed is readily inspected by the operator of the system.

While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may bemade without departing from the spirit and scope of the invention.

What is claimed is:

1. In a printing apparatus having provision for successively incrementally printing customarily under control of an operator individual characters or symbols by means of a printhead in predefined-locations on a receiving member, each of said characters or symbols comprising components between and including a starting position and a termination position, said apparatus being operable to print all components of each individual character or symbol. during a single print cycle, each said print cycle comprising first, second and third cycle portions, a method for establishing better visibility of characters and symbols as they are printed, comprising;

1. during the first cycle portion of each said print cycle, relatively moving said printhead and said receiving member from a position beyond the termination position of the character or symbol presently to be printed in order to relatively locate said print head and said receiving member prior to the starting position of the individual character or symbol to be printed;

2. during the second cycle portion of each said print cycle, relatively moving said receiving member and said printhead in a printing direction, said printhead having facilities and being operable to print components of said character or symbol during said relative movement;

3. during the third cycle portion of each said print cycle of each individual character or symbol incrementally printed, overbounding and invariably stopping said printhead past the termination positon of said individual character or symbol into at least the next succeeding character or symbol location so that said printhead is out of the normal sight line of an operator of said apparatus and each character and symbol printed on said receiving member is readily visible.

2. Printing apparatus for establishing better visibility of characters and symbols as they are printed, and having provisions for successively incrementally printing customarily under control of an operator individual characters or symbols by means of a printhead in predefined locations on a document, each of said characters or symbols comprising character components between and including a starting position and a termination position, said apparatus being operable to print all components of each individual character or symbol during asingle symbol print cycle, each said print cycle comprising first,

second and third cycle portions, comprising:

1. means for positioning a document for printing;

2. printhead means positioned adjacent said document for selectively forming, propelling, charging and deflecting marking components for selective deposition on said document;

3. first means operable during the first cycle portion of each said print cycle to relatively move said printheadand said receiving member from a position beyond the termination position of the character or symbol presently to be printed in order to relatively locate saidprinthead and said receiving member prior to the starting position of the individual character or symbol to be printed;

4. second means operable during the second cycle portion of each said print cycle to relatively move said document and said printhead in a printing direction and for operating said printhead to print components of a said character or symbol during said relative movement;

5. third means operable during the third cycle portion of each said print cycle of each individual character or symbol incrementally printed to invariably stop said printhead past the termination position of said individual character or symbol into at least the next succeeding character or symbol location so that said printhead is out of the normal sight line of an operator of said apparatus and each character and symbol printed on said receiving member is readily visible.

3. The apparatus of claim 2 wherein said printhead means is operable during the second cycle portions to selectively propel and deposit ink drops on said document serving as said marking components.

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Non-Patent Citations
Reference
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3929071 *Dec 23, 1974Dec 30, 1975IbmInk recirculating system for ink jet printing apparatus
US4024941 *Dec 11, 1975May 24, 1977Nippon Electric Company, Ltd.Dot matrix type serial printer
US4026402 *Jul 28, 1975May 31, 1977Centronics Data Computer CorporationIncremental line printer
US4050563 *Nov 5, 1975Sep 27, 1977Centronics Data Computer CorporationApparatus for selectable font printing
US4050564 *Dec 4, 1975Sep 27, 1977International Business Machines CorporationElectronic control for optimizing carrier turnaround in printing apparatus
US4059183 *Dec 30, 1976Nov 22, 1977International Business Machines CorporationDot matrix printer with slanted print head and modular skewing of dot pattern information
US4178107 *May 3, 1977Dec 11, 1979Ing. C. Olivetti & C., S.P.A.Typing device
US4208139 *Jan 18, 1978Jun 17, 1980Sharp Kabushiki KaishaCarriage position control in a printer of the carriage traveling mode
US4247214 *Nov 8, 1978Jan 27, 1981Ncr CorporationCharacter position control for a matrix printer
US4265556 *Dec 21, 1978May 5, 1981International Business Machines CorporationApparatus for setting proportional margins based upon the width of a scanned sheet of paper
US4270868 *Oct 24, 1978Jun 2, 1981International Business Machines CorporationDigital pulse-width modulated printer escapement control system
US4272204 *Dec 21, 1978Jun 9, 1981International Business Machines CorporationAutomatic margin determining apparatus for a scanned sheet of paper
US4286889 *Jul 5, 1979Sep 1, 1981Triumph Werke Nurnberg A.G.Error correcting typewriter with electronically controlled backspacing to facilitate perfect overstrike of errors
US4353298 *Oct 19, 1979Oct 12, 1982International Business Machines CorporationPartial line turnaround for printers
US4548825 *Oct 3, 1983Oct 22, 1985Boehringer Ingelheim GmbhMethod for ink-jet printing on uncoated tablets or uncoated tablet cores
US6149072 *Apr 23, 1998Nov 21, 2000Arizona State UniversityDroplet selection systems and methods for freeform fabrication of three-dimensional objects
US6565173Sep 19, 2000May 20, 2003Hewlett-Packard CompanyThermal inkjet printer apparatus and method
DE2855063A1 *Dec 20, 1978Jul 5, 1979IbmTintenstrahldrucker
WO1980000944A1 *Nov 2, 1979May 15, 1980Ncr CoAn apparatus for producing imprints along a line on a recording medium
Classifications
U.S. Classification400/322, 347/37
International ClassificationB41J21/18, B41J29/18, B41J19/20
Cooperative ClassificationB41J21/18, B41J29/18, B41J19/202
European ClassificationB41J19/20B, B41J29/18, B41J21/18
Legal Events
DateCodeEventDescription
Mar 28, 1991ASAssignment
Owner name: IBM INFORMATION PRODUCTS CORPORATION, 55 RAILROAD
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:INTERNATIONAL BUSINESS MACHINES CORPORATION;REEL/FRAME:005678/0098
Effective date: 19910326
Owner name: MORGAN BANK
Free format text: SECURITY INTEREST;ASSIGNOR:IBM INFORMATION PRODUCTS CORPORATION;REEL/FRAME:005678/0062
Effective date: 19910327