US3356199A - Printer having type disk rotatable in a plane parallel to the printing line - Google Patents

Printer having type disk rotatable in a plane parallel to the printing line Download PDF

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US3356199A
US3356199A US529455A US52945566A US3356199A US 3356199 A US3356199 A US 3356199A US 529455 A US529455 A US 529455A US 52945566 A US52945566 A US 52945566A US 3356199 A US3356199 A US 3356199A
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wheel
print
printing
line
characters
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US529455A
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Leland P Robinson
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Friden Inc
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Friden Inc
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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
    • B41J1/00—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies
    • B41J1/22—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection
    • B41J1/24—Typewriters or selective printing mechanisms characterised by the mounting, arrangement or disposition of the types or dies with types or dies mounted on carriers rotatable for selection the plane of the type or die face being perpendicular to the axis of rotation
    • B41J1/28—Carriers stationary for impression, e.g. with the types or dies not moving relative to the carriers
    • B41J1/30—Carriers stationary for impression, e.g. with the types or dies not moving relative to the carriers with the types or dies moving relative to the carriers or mounted on flexible carriers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S400/00—Typewriting machines
    • Y10S400/901—Continuously rotating type-head

Definitions

  • the wheel is moved continuously in a plane parallel to the path of line printing.
  • a desired character of a group may be printed in a columnar print position of the printing line due to the spiral arrangement of the type characters.
  • This invention relates to high-speed printers capable of printing information received from data handling apparatus, such as computers or calculators by way of example.
  • One known type of rapid readout with permanent recordation incorporates a high-speed printer that employs a character type Wheel bearing the characters to be printed at the outer periphery of respective spokes forming the wheel.
  • the character wheel is advanced intermittently from one print position to the next, while it rotates continuously.
  • stop and start operation tends to reduce the speed of the system, and also causes undue wear and tear on the mechanical parts.
  • An object of the present invention is to provide a novel and improved on-the-fiy high-speed printer, wherein the character supporting assembly is rotated continuously while being transported continually along the path of line printing, without interruption during each cycle of line printing.
  • a high-speed printer comprises a rotary means having type faces representing characters to be printed, the type faces being disposed in at least one group defining a spiral path.
  • the rotary type means which may be a wheel with separate spokes supporting type symbols or characters, is continuously rotated and is urged along the path or line of print conjointly with a striking hammer to effectuate printing on a record medium or paper.
  • the type wheel traverses the print line in a continuous and noninterrupted motion, precluding those problems that arise from intermittent operation such as found in prior art devices.
  • each character of the group appears at substantially the same spot for each particular print position.
  • each half or semicircular portion of the type wheel carries a separate group of spirally disposed characters from which one character 3,356,199 Patented Dec. 5, 1967 may be selected for printing while the wheel is on-thefly.
  • the groups are identical and like characters are substantially diametrically opposed.
  • FIG. 1 is a front elevational view, partly broken away, of the printer apparatus of this invention
  • FIG. 2 is a side elevational view of the novel printer, taken along a plane indicated by the line 22 of FIG. 1;
  • FIG. 3 depicts the novel character wheel in two different printing positions along the same print line.
  • an embodiment of a high-speed printer in accordance with this invention, comprises a type Wheel 10 formed with resilient, flexible spokes 12, each spoke supporting a character or symbol near the periphery of the wheel.
  • two identical groups of characters are disposed in diametric relation, each group occupying a semicircular portion of the wheel 10.
  • the type wheel 10 is driven by a pinion gear 14 that is actuated by a rack 16 in a wellknown manner, the axis of the gear and type wheel being at a right angle to the printing line.
  • a pinion gear 14 that is actuated by a rack 16 in a wellknown manner, the axis of the gear and type wheel being at a right angle to the printing line.
  • the characters, shown as numerals in the wheel 10, rotate clockwise in the illustrated embodiment, and are disposed so as to form a spiral configuration for each character group, each group spiral,
  • the wheel 10 is coupled to a carriage 18 that is transported linearly along a rotatable drive screw or threaded shaft 20, which is fixed with its axis substantially parallel to the proposed paths of line printing. Also mounted to the carriage 18 is the print hammer assembly 22 utilized for striking a selected character at each print position, whereby printing on a record medium or paper 24 is effectuated.
  • the paper 24 is located between a fixed platen 26 and an ink ribbon 28 which is fed from a supply spool 29. Self-inked papers or the like may be used to eliminate the need for the ribbon.
  • the platen 26, which is secured to a rigid frame 27, has two axial rows of apertures 31 that provide suction for firm adherence of the paper 24 to the platen.
  • Pressure supply or a vacuum source 33 maintains the necessary suction during the print cycle.
  • the suction is removed by valve means, for example, to allow facile advance of the paper to the next line position.
  • a return spring 30 is provided to urge the carriage 18 back to Home or start position at the end of each cycle of line printing.
  • a detent pin 32 is provided for coupling the carriage 18 to the drive screw 20 during print operation, and for decoupling the carriage to allow spring retraction between print cycles, as disclosed in .copending application Ser. No. 528,501, filed Feb. 18, 1966, in behalf of Leland Chamness et al., and assigned to the same assignee.
  • the source of power drive for the carriage and type wheel, as well as other conventional parts commonly used in printer apparatus, are not shown for the purposes of convenience and clarity.
  • the carriage 18 is moved with the rotating wheel 10 and print hammer 22 in a longitudinal path defining the direction of serial printing of the line characters.
  • the Wheel 10a is in position for printing the numeral. Any numeral in the semicircular group 0 to 9 will appear in substantially the same print position or spot, delineated by the rectangle encompassing the 0.
  • the wheel is represented with the numeral 4 in position for selection for imprinting.
  • the print hammer 22 is made sufficiently wide, preferably two column widths, so as to be capable of printing at a selected column, regardless of where the selected character appears.
  • Each character of a group is positioned at successively shorter distances from the center of curvature of the spiral defined by the characters.
  • the difference in such distance between adjacent characters is substantially equal to the amount of linear displacement of the carriage and print Wheel along the print line, which occurs during the interval that the wheel is rotated from one numeral to the next in the same group.
  • the succeeding O of the next group which is positioned a predetermined distance further from the center of curvature than the preceding 9, traverses the next print position. It is evident that the difference in length between the radius of curvature of the 9 character and that of the 0 character of the succeeding group substantially represents the distance between adjacent print positions.
  • the angular velocity of the print wheel 10 is such that for every 180 of rotation of the wheel 10, the carriage is translated axially from one print position to the next; and thus, for each complete revolution of the print Wheel, the carriage and print wheel traverses two print positions.
  • each alternate print position is accommodated by one group of numerals, while the second group provides the other interspaced print positions with a selected numeral to be printed.
  • each group would provide a character for every Nth print position.
  • Selection of a character for printing may be accomplished by any one of several known means, such as by an optical system employing a radiation source and photosensing means cooperating with a timing disk having a reference aperture and a series of holes, each hole corresponding to a different character position.
  • Input data received from a keyboard, punched tape, or recorded magnetic tape, for example, serves to actuate the print hammer when a selected character is in print position.
  • the hammer By employing a plurality of character groups, the hammer is allowed ample time to strike a selected spoke of one character group at one print position. As described heretofore, a blank spoke or space is provided at the end of each character group to allow recovery time for the hammer. Thus, while the type wheel advances to the next character group, the hammer is able to retract and recover to ready position, so that it can be triggered to strike a character from the succeeding group at the next print position.
  • a high-speed printer apparatus comprising:
  • a rotary wheel supporting a plurality of type characters on one side surface, said characters being disposed in a spiral curve receding toward the axis of said wheel;
  • a high-speed printer apparatus as in claim 2 wherein such plurality comprises two groups, each group positioned within a semicircular portion of a side surface of said Wheel.
  • a high-speed printer apparatus as in claim 1 including power means for returning said hammer and wheel to home position at the end of each cycle of line printing, and means for disabling said transporting means and enabling said power means.
  • a high-speed printer apparatus as in claim 2 wherein said wheel comprises a multiplicity of separate spokes, each said spoke supporting a type character and the characters being disposed spirally on the respective spokes receding from the periphery of the wheel.
  • a high-speed printer apparatus as in claim 8 wherein the difference in length of the radius of curvature of the last character of a group, and that of the first character of the succeeding group is substantially equivalent to the distance between adjacent print positions in a printing line.

Description

Dec. 5, 1967 A L. P. ROBINSON 3,356,199
PRINTER HAVING TYPE DISK ROTATABLE IN A PLANE PARALLEL TO THE PRINTING LINE Filed Feb. 23, 1966 VACUUM SOURCE V PRINT LIN LELAND F? ROBINSON INVENTOR.
ATTORNEY United States Patent M 3,356,199 PRINTER HAVING TYPE DISK ROTATABLE IN A PLANE PARALLEL TO THE PRINTING LINE Leland P. Robinson, Oakland, Calif., assignor to Friden, Inc., a corporation of Delaware Filed Feb. 23, 1966, Ser. No. 529,455 9 Claims. (Cl. 197--54) ABSTRACT OF THE DISCLOSURE A high-speed printer utilizing a continuously rotating type wheel having at least one group of type characters on its face. Preferably, a plurality of similar groups of type characters are provided. Each group is arranged spirally relative to the center of the wheel and each type character is preferably supported on the face of a corresponding spoke or radial extension. During the continuous rotation of the type wheel, the wheel is moved continuously in a plane parallel to the path of line printing. With each predetermined angular rotation of the wheel, a desired character of a group may be printed in a columnar print position of the printing line due to the spiral arrangement of the type characters.
This invention relates to high-speed printers capable of printing information received from data handling apparatus, such as computers or calculators by way of example.
With the advent of computer technology and advances in the art of data processing, requirements for increased speed of handling information have become more stringent. One known type of rapid readout with permanent recordation incorporates a high-speed printer that employs a character type Wheel bearing the characters to be printed at the outer periphery of respective spokes forming the wheel. In such prior art apparatus, the character wheel is advanced intermittently from one print position to the next, while it rotates continuously. However, such stop and start operation tends to reduce the speed of the system, and also causes undue wear and tear on the mechanical parts.
An object of the present invention is to provide a novel and improved on-the-fiy high-speed printer, wherein the character supporting assembly is rotated continuously while being transported continually along the path of line printing, without interruption during each cycle of line printing.
According to this invention, a high-speed printer comprises a rotary means having type faces representing characters to be printed, the type faces being disposed in at least one group defining a spiral path. The rotary type means, which may be a wheel with separate spokes supporting type symbols or characters, is continuously rotated and is urged along the path or line of print conjointly with a striking hammer to effectuate printing on a record medium or paper. The type wheel traverses the print line in a continuous and noninterrupted motion, precluding those problems that arise from intermittent operation such as found in prior art devices.
The spiral arrangement of the characters or symbols compensates for lateral displacement of the rotating type faces resulting from the continuous linear motion of the type wheel along the path of the line of printing. As a result of such compensation, each character of the group appears at substantially the same spot for each particular print position.
In a particular embodiment, each half or semicircular portion of the type wheel carries a separate group of spirally disposed characters from which one character 3,356,199 Patented Dec. 5, 1967 may be selected for printing while the wheel is on-thefly. The groups are identical and like characters are substantially diametrically opposed.
The invention will be described in greater detail with reference to the drawing in which:
FIG. 1 is a front elevational view, partly broken away, of the printer apparatus of this invention;
FIG. 2 is a side elevational view of the novel printer, taken along a plane indicated by the line 22 of FIG. 1; and
FIG. 3 depicts the novel character wheel in two different printing positions along the same print line.
Similar numerals refer to similar elements throughout the drawing.
With reference to the figures of the drawing, an embodiment of a high-speed printer, in accordance with this invention, comprises a type Wheel 10 formed with resilient, flexible spokes 12, each spoke supporting a character or symbol near the periphery of the wheel. In this particular embodiment, two identical groups of characters are disposed in diametric relation, each group occupying a semicircular portion of the wheel 10. At the end of each group of characters there is one spoke 13 that is blank to provide a gap hiatus (see FIG. 3), whereby a suitable interval is provided for retraction and resetting of a print hammer 22 used in the printing operation.
To achieve rotary motion, the type wheel 10 is driven by a pinion gear 14 that is actuated by a rack 16 in a wellknown manner, the axis of the gear and type wheel being at a right angle to the printing line. It should be understood that the gear configuration and gear ratios depicted herein are merely illustrative, and should not be interpreted as exclusionary. The characters, shown as numerals in the wheel 10, rotate clockwise in the illustrated embodiment, and are disposed so as to form a spiral configuration for each character group, each group spiral,
characterized by a decreasing radius of curvature in the direction of rotation of the wheel.
The wheel 10 is coupled to a carriage 18 that is transported linearly along a rotatable drive screw or threaded shaft 20, which is fixed with its axis substantially parallel to the proposed paths of line printing. Also mounted to the carriage 18 is the print hammer assembly 22 utilized for striking a selected character at each print position, whereby printing on a record medium or paper 24 is effectuated. The paper 24 is located between a fixed platen 26 and an ink ribbon 28 which is fed from a supply spool 29. Self-inked papers or the like may be used to eliminate the need for the ribbon.
The platen 26, which is secured to a rigid frame 27, has two axial rows of apertures 31 that provide suction for firm adherence of the paper 24 to the platen. Pressure supply or a vacuum source 33 maintains the necessary suction during the print cycle. During the interval between each line of printing, the suction is removed by valve means, for example, to allow facile advance of the paper to the next line position.
A return spring 30 is provided to urge the carriage 18 back to Home or start position at the end of each cycle of line printing. A detent pin 32 is provided for coupling the carriage 18 to the drive screw 20 during print operation, and for decoupling the carriage to allow spring retraction between print cycles, as disclosed in .copending application Ser. No. 528,501, filed Feb. 18, 1966, in behalf of Leland Chamness et al., and assigned to the same assignee. The source of power drive for the carriage and type wheel, as well as other conventional parts commonly used in printer apparatus, are not shown for the purposes of convenience and clarity.
In operation, the carriage 18 is moved with the rotating wheel 10 and print hammer 22 in a longitudinal path defining the direction of serial printing of the line characters. As depicted in FIG. 3, at a first position of a given print line, the Wheel 10a is in position for printing the numeral. Any numeral in the semicircular group 0 to 9 will appear in substantially the same print position or spot, delineated by the rectangle encompassing the 0. Similarly, at a second print position further along the print line, the wheel is represented with the numeral 4 in position for selection for imprinting. The print hammer 22 is made sufficiently wide, preferably two column widths, so as to be capable of printing at a selected column, regardless of where the selected character appears.
Each character of a group is positioned at successively shorter distances from the center of curvature of the spiral defined by the characters. The difference in such distance between adjacent characters is substantially equal to the amount of linear displacement of the carriage and print Wheel along the print line, which occurs during the interval that the wheel is rotated from one numeral to the next in the same group. Also, when the last numeral 9 in a group has passed print position, the succeeding O of the next group which is positioned a predetermined distance further from the center of curvature than the preceding 9, traverses the next print position. It is evident that the difference in length between the radius of curvature of the 9 character and that of the 0 character of the succeeding group substantially represents the distance between adjacent print positions. The angular velocity of the print wheel 10 is such that for every 180 of rotation of the wheel 10, the carriage is translated axially from one print position to the next; and thus, for each complete revolution of the print Wheel, the carriage and print wheel traverses two print positions.
It should be noted that with two separate groups of numerals, selection of a numeral for printing will be made alternately from each group. That is, each alternate print position is accommodated by one group of numerals, while the second group provides the other interspaced print positions with a selected numeral to be printed. Thus, if N groups of numerals are used, each group would provide a character for every Nth print position.
Selection of a character for printing may be accomplished by any one of several known means, such as by an optical system employing a radiation source and photosensing means cooperating with a timing disk having a reference aperture and a series of holes, each hole corresponding to a different character position. Input data received from a keyboard, punched tape, or recorded magnetic tape, for example, serves to actuate the print hammer when a selected character is in print position.
By employing a plurality of character groups, the hammer is allowed ample time to strike a selected spoke of one character group at one print position. As described heretofore, a blank spoke or space is provided at the end of each character group to allow recovery time for the hammer. Thus, while the type wheel advances to the next character group, the hammer is able to retract and recover to ready position, so that it can be triggered to strike a character from the succeeding group at the next print position.
It should be understood that various modifications and alternatives of the embodiment described above are possible within the scope of this invention. For example, a plurality of wheels of different diameters may be employed with associated hammers for the simultaneous printing of a plurality of characters along a line, or in some other predetermined configuration. Also, the arrangement of the paper and ribbon relative to the type wheel and hammer may be changed, and the drive system may be modified accordingly. 4
What is claimed is:
1. A high-speed printer apparatus comprising:
a rotary wheel supporting a plurality of type characters on one side surface, said characters being disposed in a spiral curve receding toward the axis of said wheel;
means for rotating said wheel continuously during each cycle of line printing and in a plane parallel to the printing line;
a print hammer for striking selected characters to print a line during each of such print cycles; and
means for transporting said wheel and said hammer relative to a record medium, continuously and without interrupted travel along a predetermined line of. printing.
2. A high-speed printer apparatus as in claim 1 wherein said type characters are disposed in a plurality of separate groups on said wheel, each group of characters defining a separate spiral path toward the axis of said wheel.
3. A high-speed printer apparatus as in claim 2 wherein said separate groups are substantially identical.
4. A high-speed printer apparatus as in claim 2 wherein such plurality comprises two groups, each group positioned within a semicircular portion of a side surface of said Wheel.
5. A high-speed printer apparatus as in claim 4 wherein the two groups consist of like characters, similar characters of each group being substantially dimetrically opposed.
6. A high-speed printer apparatus as in claim 1 including power means for returning said hammer and wheel to home position at the end of each cycle of line printing, and means for disabling said transporting means and enabling said power means.
7. A high-speed printer apparatus as in claim 2 wherein said wheel comprises a multiplicity of separate spokes, each said spoke supporting a type character and the characters being disposed spirally on the respective spokes receding from the periphery of the wheel.
8. A high-speed printer apparatus as in claim 7 wherein said spokes are grouped in different portions of the wheel, and the characters of each group define a spiral having a decreasing radius of curvature.
9. A high-speed printer apparatus as in claim 8 wherein the difference in length of the radius of curvature of the last character of a group, and that of the first character of the succeeding group is substantially equivalent to the distance between adjacent print positions in a printing line.
References Cited UNITED STATES PATENTS 438,430 10/1890 Clerk 19753 1,189,449 7/1916 Highley 19754 2,060,082 11/1936 Johnson et al. 10l382 X 2,236,663 4/1941 Adams 19753 2,484,671 10/1949 Bauman 101 2,590,044 3/1952 Schaller 101382 X 2,831,424 4/1958 MacDonald 1971 X 2,843,243 7/1958 Masterson 101-93 X 2,926,602 3/1960 MacDonald et al 10193 3,023,731 3/ 1962 Schwertz. 3,128,693 4/1964 Thiemann 10193 3,151,547 10/1964 Hornmaner et al. 19749 X 3,220,343 11/1965 Wasserman l0l-93 3,247,788 4/1966 Wilkins et al. 101-93 ROBERT E. PULFREY, Primary Examiner.
E. S, BURR, Examiner.

Claims (1)

1. A HIGH-SPEED PRINGER APPARATUS COMPRISING: A ROTARY WHEEL SUPPORTING A PLURALITY OF TYPE CHARACTERS ON ONE SIDE SURFADE, SAID CHARACTERS BEING DISPOSED IN A SPIRAL CURVE RECEDING TOWARD THE AXIS OF SAID WHEEL; MEANS FOR ROTATING SAID WHEEL CONTINUOUSLY DURING EACH CYCLE OF LINE PRINTING AND IN A PLANE PARALLEL TO THE PRINTING LINE; A PRINT HAMMER FOR STRIKING SELECTED CHARACTERS TO PRINT A LINE DURING EACH OF SUCH PRINT CYCLES; AND MEANS FOR TRANSPORTING SAID WHEEL AND SAID HAMMER RELATIVE TO A RECORD MEDIUM, CONTINUOUSLY AND WITHOUT INTERRUPTED TRAVEL ALONG A PREDETERMINED LINE OF PRINTING.
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US3442364A (en) * 1967-10-02 1969-05-06 Friden Inc Printing system with helical arrangement of type on type wheel
US3442365A (en) * 1967-09-29 1969-05-06 Friden Inc Font wheel aligning device
US3447656A (en) * 1965-09-07 1969-06-03 Richard A Nyquist Typewriter for flat surfaces having a type head movable relative to a stationary base
DE1905226A1 (en) * 1968-01-29 1969-09-04 Olivetti & Co Spa Serial printer
US3599772A (en) * 1969-04-30 1971-08-17 Singer Co Sinuous font arrangement for a printing means
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US3651914A (en) * 1971-01-22 1972-03-28 Sperry Rand Corp Asynchronous printer
US3669237A (en) * 1970-05-04 1972-06-13 American Regitel Corp Double helical printer
US3677386A (en) * 1969-06-26 1972-07-18 Ecofon Probst Kg Verkaufsges Electrically operated typewriter
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US3023731A (en) * 1957-06-06 1962-03-06 Haloid Co Electrostatic alphanumerical printer with image transfer mechanism
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US3447656A (en) * 1965-09-07 1969-06-03 Richard A Nyquist Typewriter for flat surfaces having a type head movable relative to a stationary base
US3442365A (en) * 1967-09-29 1969-05-06 Friden Inc Font wheel aligning device
US3442364A (en) * 1967-10-02 1969-05-06 Friden Inc Printing system with helical arrangement of type on type wheel
DE1905226A1 (en) * 1968-01-29 1969-09-04 Olivetti & Co Spa Serial printer
US3651916A (en) * 1968-01-29 1972-03-28 C Olivetti C & C Spa Ing Printing device with interchangeable printing members
US3613856A (en) * 1968-12-27 1971-10-19 Ibm Antiwear shield for continuously rotatable-type disc printer
US3599772A (en) * 1969-04-30 1971-08-17 Singer Co Sinuous font arrangement for a printing means
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US3768621A (en) * 1970-04-13 1973-10-30 Int Standard Electric Corp Printing mechanism for serial data recording
US3669237A (en) * 1970-05-04 1972-06-13 American Regitel Corp Double helical printer
US3707122A (en) * 1970-07-13 1972-12-26 Peripheral Dynamics Print hammer mechanism with magnetic reinforcement to cath hammer
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US3840104A (en) * 1971-12-29 1974-10-08 Dalmine Spa Machine for engraving on curved metallic surfaces
US3902419A (en) * 1972-08-19 1975-09-02 Agfa Gevaert Ag Apparatus for applying symbols to webs of photographic material or the like
US3884340A (en) * 1973-10-10 1975-05-20 Pitney Bowes Inc Type disc and method of making same
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US3921784A (en) * 1974-03-15 1975-11-25 Pitney Bowes Inc Printing disc having bifurcated type arms
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US3924725A (en) * 1974-06-28 1975-12-09 Ibm Dual array disc printer
US3908809A (en) * 1974-12-30 1975-09-30 Ibm High speed printer
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US4057015A (en) * 1976-03-04 1977-11-08 Di/An Controls, Inc. Bar code printing system
US4149809A (en) * 1978-01-27 1979-04-17 Scm Corporation Typewriter spiral disc printer
US4178108A (en) * 1978-06-26 1979-12-11 International Business Machines Corporation Apparatus for space synchronizing carrier and rotatable print disk positions in on-the-fly printing
US4236842A (en) * 1978-08-03 1980-12-02 A. B. Dick Company Hammer support for rotary printing apparatus
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US4268177A (en) * 1978-11-01 1981-05-19 Plessey Peripheral Systems Paper thickness adjusting mechanism for impact printer
US4297043A (en) * 1978-11-01 1981-10-27 Plessey Peripheral Systems Impact printer inclined ribbon scanner
US4345846A (en) * 1980-10-03 1982-08-24 International Business Machines Corporation Impact printer with dual helix character print elements
US4493571A (en) * 1981-10-09 1985-01-15 Iquad Company Incorporated Print guide mechanism
US4494884A (en) * 1982-11-04 1985-01-22 Lowell Herman H Spoked multiple-wheel printer
US4522122A (en) * 1983-05-03 1985-06-11 Ncr Canada Ltd - Ncr Canada Ltee Fast impact hammer for high speed printer
US4792249A (en) * 1985-09-20 1988-12-20 Creative Associates Limited Partnership Vacuum paper transport system for printer
EP0225710A2 (en) * 1985-11-30 1987-06-16 Unisys Corporation Printing apparatus
EP0225710A3 (en) * 1985-11-30 1988-03-02 Unisys Corporation Printing apparatus
US4770551A (en) * 1985-11-30 1988-09-13 Unisys Corporation Printing apparatus for enciphering/deciphering text
US4832512A (en) * 1986-05-29 1989-05-23 Benson S.A. Plotting machine

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