US3135195A - High speed printer with moving characters and single hammer - Google Patents

High speed printer with moving characters and single hammer Download PDF

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Publication number
US3135195A
US3135195A US118812A US11881261A US3135195A US 3135195 A US3135195 A US 3135195A US 118812 A US118812 A US 118812A US 11881261 A US11881261 A US 11881261A US 3135195 A US3135195 A US 3135195A
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hammer
printing
belt
high speed
moving
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US118812A
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John T Potter
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Potter Instrument Co Inc
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Potter Instrument Co Inc
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Priority to US118812A priority Critical patent/US3135195A/en
Priority to FR901345A priority patent/FR1328069A/en
Priority to GB23752/62A priority patent/GB994159A/en
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Publication of US3135195A publication Critical patent/US3135195A/en
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Assigned to SPERRY CORPORATION reassignment SPERRY CORPORATION LICENSE (SEE DOCUMENT FOR DETAILS). EFFECTIVE OCT. 15,1982 Assignors: POTTER INSTRUMENT COMPANY, INC.
Expired - Lifetime legal-status Critical Current

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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
    • B41J9/00—Hammer-impression mechanisms
    • B41J9/02—Hammers; Arrangements thereof
    • B41J9/04—Hammers; Arrangements thereof of single hammers, e.g. travelling along printing line

Definitions

  • the prior art high speed printers employing continuously moving type face provide a row of printing hammers, one for each character along a printing line, and control logic which electromagnetically actuates each hammer at an appropriate instant. While such a system permits printing at high speed, it is expensive since a large number of relatively expensive hammers are required; and requires considerable power and reserve power since several hammers may be required to operate simultaneously.
  • Printing logic compares each character position along a printing line with the characters to be printed and whenever a match is found, the corresponding hammer is actuated substantially instantaneously. Since several characters may be in printing position simultaneously, enough reserve power must be provided to meet the peak load condition thereby imposed.
  • the present invention concerns a single printing hammer for use with a belt or drum printer and with methods of and means for moving this single hammer to accomplish the function of two or more stationary hammers along the printing line of a belt or drum printer.
  • the single hammer is mounted to slide on two guide rails parallel to the printing line and is attached to an endless belt which is moved as required by a capstan and pinch roller combination.
  • a transducer attached to the hammer generates a signal to indicate when it is aligned with a given printing position to trigger the hammer firing circuit.
  • one object of the present invention is to provide methods of and means for utilizing a single printing hammer to perform the function normally performed by a plurality of hammers in a character drum or belt type printer.
  • Another object is to provide positional signals for actuating a single printing hammer used in connection with a drum or belt type printer.
  • Still another object is to greatly reduce the peak power requirements of a high speed printer utilizing a character drum or belt.
  • a further object is to provide moving and guiding means for a single printing hammer used in combination with a character drum or belt in a high speed printer.
  • FIGURE 1 is a simplified drawing of a high speed printer with a single hammer in accordance with the present invention and utilizing a printing drum.
  • FIGURE 2 is a simplified drawing of the present invention applied to a belt or chain type high speed printer.
  • FIG. 1 shows a printing web such as a continuous sheet of paper 1, drawn upward by a sprocket 2 having teeth 3 driven at a suitable speed or stepped by a motor 5 coupled to sprocket 2 by means of shaft 4.
  • the printing characters 7 are carried on the surface of a drum 6 rotated continuously by a motor 9 coupled by means of shaft 8.
  • the logical character position determinationsv may be made by a suitable coded disk and commutator such as disk 10 carrying on its surface coded conducting segments 11 contacted by brushes 13, 14, 17, 18 and 19 which in turn are held by blocks 12 and 20 and are connected to the appropriate logical circuits over leads 15, 16, 21, 22 and 23.
  • Disk 10 may be mounted to turn with drum 6 through a coupling over shaft 24.
  • This type of logic may be the same generally as that shown in the application for Letters Patent of Carl Wasserman entitled SeriesParallel Code Generator filed on October 5, 1960 and bearing Serial No. 60,601. Up to this point the system is constructed substantially as set forth in the patent and application references.
  • the single hammer utilized in accordance with the present invention includes a printing head 25 at the end of the magnetic armature 28 and pivoted around bearing 27 carried on guide rod 30.
  • the hammer is actuated electromagnctically by electro-magnet 29 at the end of frame 26 and adapted to follow on the second guide rod 31.
  • Frame 26 is moved by belt 36 passing around guide pulley wheels 37 and 45 and belt 36 in turn is pulled by the clamping action of pinch roller 39 moved by actuator 40 to engage belt 36 with rotating capstan 38.
  • the motion of the belt 36 may be stopped on command by brake shoe 42 squeezing it against pad 41 by means of actuator 43.
  • the drive and brake mechanisms are mounted in any suitable manner as, for example, on frame 44.
  • the required stopping points opposite columns of characters as the hammer is progressed along the printing line is under command of suitable control circuits, not shown, and under command of signals generated by transducer 34 carried by arm 33 of the hammer structure and passing over teeth 35. Teeth 35 are formed and positioned so that when one of them induces a signal in transducer 34 it signals that the hammer is at one of its possible printing positions.
  • the hammer is maintained at each printing position for the duration of one pass of a complete sequence of characters to be printed past it on the drum (or belt in FIG. 2).
  • the return of the hammer to the starting point may be accomplished by a pinch roller and reversely rotating capstan otherwise similar to pinch roller 39 and capstan 38 operating on belt 36 in a manner which will be apparent to those skilled in the art and therefore not shown.
  • FIG. 2 shows the single hammer of the present invention applied to a belt or chain printer.
  • printing is carried out on a paper sheet 46 drawn by suitable means, not shown, by means of type faces or characters 48 carried by a belt or chain 47 and drawn continuously along a printing line by a drive pulley 49.
  • Drive pulley 49 is driven at suitable speed and continuously by motor 51 coupled over shaft 50.
  • Belt or chain 47 completes its required path over idler pulley 52 so as to maintain a straight line movement along the desired printing line across sheet 46.
  • Logical character position signals are provided by code disk 53 carried on shaft 54 and contacted by brushes 55, 56, 57, 58 and 59.
  • the single printing hammer is provided, mounted and moved as described above in connection with FIG. 1 except that the printing hammer is allowed to dwell at each printing position during one complete passage of a type face or character sequence on belt 47 and then stepped to the next position.
  • a type carrier for moving a predetermined array of type characters arranged in a row continuously in sequence past a printing field defined by a predetermined number of said characters in said array, means connected with the type carrier for providing character position information, a single electromagnetically operable printing hammer, a belt and stepping drive device for moving said hammer across said field from one printing position to another in forward and return movements, support means for the hammer so that the hammer may be moved to each printing position, and a position signal generating transducer for signalling the arrival of said hammer at any printing position in said field.
  • a type drum means to rotatably support the drum in a laterally fixed position, a plurality of rows of type characters in a predetermined array on the drum for continuous movement in sequence past a printing field defined by said rows, a single electromagnetically operable printing hammer for printing from said drum along a line parallel with the axis of said drum, a' stepping drive device including a flexible connection for moving said hammer across said field from one printing position to another in forward and return movements along said line, support means for the hammer so that the hammer may be moved to each printing position, and a position signal generator for signalling the arrival of said hammer at any printing position in said field.
  • a high speed printing system utilizing type carried by a belt continuously along a printing line
  • a pinch roller drive mechanism positioned to engage said flexible connection means for moving said hammer.
  • v p 5 In a high speed printer as set forth in claim 4 including a brake mechanism supported to engage said flexible connection means when said pinch roller is disengaged.

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Description

J- T. POTTER June 2,. 1964 HIGH SPEED PRINTER WITH MOVING CHARACTERS AND SINGLE HAMMER Filed June 22, 1961 2 Sheets-Sheet 1 INVEN TOR.
JOHN T. POTTER ATTORNEY FIG. I
J. T. PQTTER June 2, 1964 HIGH SPEED PRINTER WITH MOVING CHARACTERS AND SINGLE HAMMER Filed June 22, 1961 2 Sheets-Sheet 2 INVENTOR.
JOHN T. POTTER W MW ATTORNEY United States Patent 3,135,195 HIGH SPEED PRINTER WITH MOVING CHARACTERS AND SINGLE ER John T. Potter, Locust Valley, N.Y., assignor to Potter Instrument Company, Inc., Plainview, N.Y., a corporation of New York Filed June 22, 1961, Ser. No. 118,812 Claims. (Cl. 101-93) The present invention concerns high speed printers and, in particular, hammer arrangements suitable for use and in combination with printers utilizing continuously moving type on a drum or a belt. High speed printers find many applications as, for example, in connection with electronic computers and the like. Many of such high speed printers utilize continuously moved type faces carried on the surface of rotating drums or belts. In order to print at high speed from these moving type faces or characters certain logical control systems must be utilized. A typical logical system is set forth in detail in United States Patent No. 2,692,551. While this patent shows and describes a type drum system similar logical control may be utilized with belt printers, i.e. printers employing type faces or characters carried by continuously rotating endless belts.
In brief, the prior art high speed printers employing continuously moving type face provide a row of printing hammers, one for each character along a printing line, and control logic which electromagnetically actuates each hammer at an appropriate instant. While such a system permits printing at high speed, it is expensive since a large number of relatively expensive hammers are required; and requires considerable power and reserve power since several hammers may be required to operate simultaneously. Printing logic compares each character position along a printing line with the characters to be printed and whenever a match is found, the corresponding hammer is actuated substantially instantaneously. Since several characters may be in printing position simultaneously, enough reserve power must be provided to meet the peak load condition thereby imposed.
It has been found according to the present invention that essentially the same logical controls can be used in a drum or belt printer provided with only a single printing hammer, provided this hammer is moved along the printing line to successively occupy each position normally occupied by one of a plurality of hammers. If a single sequence of characters without repetition is carried on a belt or on each band or column of characters on a drum, the belt or drum will be given one revolution for each discrete hammer position. If two or more complete sequences of characters is provided on the belt or drum column, the printing hammer may be moved two or more times per revolution.
The present invention concerns a single printing hammer for use with a belt or drum printer and with methods of and means for moving this single hammer to accomplish the function of two or more stationary hammers along the printing line of a belt or drum printer. In the preferred form of the invention, the single hammer is mounted to slide on two guide rails parallel to the printing line and is attached to an endless belt which is moved as required by a capstan and pinch roller combination. A transducer attached to the hammer generates a signal to indicate when it is aligned with a given printing position to trigger the hammer firing circuit.
Accordingly, one object of the present invention is to provide methods of and means for utilizing a single printing hammer to perform the function normally performed by a plurality of hammers in a character drum or belt type printer.
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Another object is to provide positional signals for actuating a single printing hammer used in connection with a drum or belt type printer.
Still another object is to greatly reduce the peak power requirements of a high speed printer utilizing a character drum or belt.
A further object is to provide moving and guiding means for a single printing hammer used in combination with a character drum or belt in a high speed printer.
These and other objects will be apparent from the detailed description of the invention given in connection with the various figures of the drawing.
In the drawing:
FIGURE 1 is a simplified drawing of a high speed printer with a single hammer in accordance with the present invention and utilizing a printing drum.
FIGURE 2 is a simplified drawing of the present invention applied to a belt or chain type high speed printer.
FIG. 1 shows a printing web such as a continuous sheet of paper 1, drawn upward by a sprocket 2 having teeth 3 driven at a suitable speed or stepped by a motor 5 coupled to sprocket 2 by means of shaft 4. The printing characters 7 are carried on the surface of a drum 6 rotated continuously by a motor 9 coupled by means of shaft 8. The logical character position determinationsv may be made by a suitable coded disk and commutator such as disk 10 carrying on its surface coded conducting segments 11 contacted by brushes 13, 14, 17, 18 and 19 which in turn are held by blocks 12 and 20 and are connected to the appropriate logical circuits over leads 15, 16, 21, 22 and 23. Disk 10 may be mounted to turn with drum 6 through a coupling over shaft 24. This type of logic may be the same generally as that shown in the application for Letters Patent of Carl Wasserman entitled SeriesParallel Code Generator filed on October 5, 1960 and bearing Serial No. 60,601. Up to this point the system is constructed substantially as set forth in the patent and application references.
The single hammer utilized in accordance with the present invention includes a printing head 25 at the end of the magnetic armature 28 and pivoted around bearing 27 carried on guide rod 30. The hammer is actuated electromagnctically by electro-magnet 29 at the end of frame 26 and adapted to follow on the second guide rod 31. Frame 26 is moved by belt 36 passing around guide pulley wheels 37 and 45 and belt 36 in turn is pulled by the clamping action of pinch roller 39 moved by actuator 40 to engage belt 36 with rotating capstan 38. The motion of the belt 36 may be stopped on command by brake shoe 42 squeezing it against pad 41 by means of actuator 43. The drive and brake mechanisms are mounted in any suitable manner as, for example, on frame 44. The required stopping points opposite columns of characters as the hammer is progressed along the printing line is under command of suitable control circuits, not shown, and under command of signals generated by transducer 34 carried by arm 33 of the hammer structure and passing over teeth 35. Teeth 35 are formed and positioned so that when one of them induces a signal in transducer 34 it signals that the hammer is at one of its possible printing positions. The hammer is maintained at each printing position for the duration of one pass of a complete sequence of characters to be printed past it on the drum (or belt in FIG. 2). The return of the hammer to the starting point may be accomplished by a pinch roller and reversely rotating capstan otherwise similar to pinch roller 39 and capstan 38 operating on belt 36 in a manner which will be apparent to those skilled in the art and therefore not shown.
FIG. 2 shows the single hammer of the present invention applied to a belt or chain printer. In this application printing is carried out on a paper sheet 46 drawn by suitable means, not shown, by means of type faces or characters 48 carried by a belt or chain 47 and drawn continuously along a printing line by a drive pulley 49. Drive pulley 49 is driven at suitable speed and continuously by motor 51 coupled over shaft 50. Belt or chain 47 completes its required path over idler pulley 52 so as to maintain a straight line movement along the desired printing line across sheet 46. Logical character position signals are provided by code disk 53 carried on shaft 54 and contacted by brushes 55, 56, 57, 58 and 59. The single printing hammer is provided, mounted and moved as described above in connection with FIG. 1 except that the printing hammer is allowed to dwell at each printing position during one complete passage of a type face or character sequence on belt 47 and then stepped to the next position.
While only two embodiments of the present invention have been shown and described, many modifications will be apparent to those skilled in the art and Within the spirit and scope of the invention as set forth in particular in the appended claims.
What is claimed is:
1. In a high speed printing system utilizing type moving continuously past a plurality of discrete character printing positions, the combination of, a type carrier for moving a predetermined array of type characters arranged in a row continuously in sequence past a printing field defined by a predetermined number of said characters in said array, means connected with the type carrier for providing character position information, a single electromagnetically operable printing hammer, a belt and stepping drive device for moving said hammer across said field from one printing position to another in forward and return movements, support means for the hammer so that the hammer may be moved to each printing position, and a position signal generating transducer for signalling the arrival of said hammer at any printing position in said field.
2. In a high speed printing system utilizing type moving continuously past a plurality of discrete character printing positions, the combination of, a type drum, means to rotatably support the drum in a laterally fixed position, a plurality of rows of type characters in a predetermined array on the drum for continuous movement in sequence past a printing field defined by said rows, a single electromagnetically operable printing hammer for printing from said drum along a line parallel with the axis of said drum, a' stepping drive device including a flexible connection for moving said hammer across said field from one printing position to another in forward and return movements along said line, support means for the hammer so that the hammer may be moved to each printing position, and a position signal generator for signalling the arrival of said hammer at any printing position in said field.
3. In a high speed printing system utilizing type carried by a belt continuously along a printing line, the combination of, a endless loop belt type carrier, a predetermined number of sequences of type characters on the belt, support means for moving the belt continuously along the printing line, means connected with the belt for providing character position information, a single electromagnetically operable printing hammer for printing from said type along said line, a stepping drive device including a flexible connection for moving said hammer from one printing position to another in forward and return movements along said line, support means for the hammer so that the hammer may be moved to each printing position, and a position signal generator for signalling the arrival of said hammer at each of said printing positions.
4. In a high speed printer as set forth in claim 3 including a pinch roller drive mechanism positioned to engage said flexible connection means for moving said hammer. v p 5. In a high speed printer as set forth in claim 4 including a brake mechanism supported to engage said flexible connection means when said pinch roller is disengaged.
Referenees Cited in the file of this patent UNITED STATES PATENTS 2,757,775 Hicker son Aug. 7, 1956 2,831,424 MacDonald Apr. 22, 1958 2,843,243 Masterson July 15, 1958 2,915,967 Gehring et a1. Dec. 8, 1959 v2,918,865 Wooding Dec. 29, 1959 2,926,602 MacDonald Mar. 1, 1960 2,990,767 Demer et a1. July 4, 1961 2,997,152 Dirks Aug. 22, 1961' 3,001,469 Davis et al. Sept. 26, 1961 3,007,399 Sasaki et al. Nov. 7, 1961

Claims (1)

1. IN A HIGH SPEED PRINTING SYSTEM UTILIZING TYPE MOVING CONTINUOUSLY PAST A PLURALITY OF DISCRETE CHARACTER PRINTING POSITIONS, THE COMBINATION OF, A TYPE CARRIER FOR MOVING A PREDETERMINED ARRAY OF TYPE CHARACTERS ARRANGED IN A ROW CONTINUOUSLY IN SEQUENCE PAST A PRINTING FIELD DEFINED BY A PREDETERMINED NUMBER OF SAID CHARACTERS IN SAID ARRAY, MEANS CONNECTED WITH THE TYPE CARRIER FOR PROVIDING CHARACTER POSITION INFORMATION, A SINGLE ELECTROMAGNETICALLY OPERABLE PRINTING HAMMER, A BELT AND STEPPING DRIVE DEVICE FOR MOVING SAID HAMMER ACROSS SAID FIELD FROM ONE PRINTING POSITION TO ANOTHER IN FORWARD AND RETURN MOVEMENTS, SUPPORT MEANS FOR THE HAMMER SO THAT THE HAMMER MAY BE MOVED TO EACH PRINTING POSITION, AND A POSITION SIGNAL GENERATING TRANSDUCER FOR SIGNALLING THE ARRIVAL OF SAID HAMMER AT ANY PRINTING POSITION IN SAID FIELD.
US118812A 1961-06-22 1961-06-22 High speed printer with moving characters and single hammer Expired - Lifetime US3135195A (en)

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FR901345A FR1328069A (en) 1961-06-22 1962-06-20 High speed printer
GB23752/62A GB994159A (en) 1961-06-22 1962-06-20 Improvements in or relating to high speed printers

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Cited By (40)

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US3196783A (en) * 1963-05-10 1965-07-27 Potter Instrument Co Inc Printer magnet core
US3212435A (en) * 1963-07-01 1965-10-19 Ibm High speed printer with reciprocable type bar
US3236351A (en) * 1961-12-05 1966-02-22 Ibm High speed matrix printer
US3269510A (en) * 1964-04-17 1966-08-30 Electronic Associates Symbol printer with means to print in two directions
US3279365A (en) * 1964-05-15 1966-10-18 Invac Corp High speed belt printer with comparison means
US3283869A (en) * 1964-10-26 1966-11-08 Hughes Aircraft Co Striking letter automatic wheel printer for use on flat surfaces
US3291042A (en) * 1963-09-16 1966-12-13 Clary Corp High speed printing mechanism
US3291909A (en) * 1962-10-25 1966-12-13 Scm Corp Drum printer
US3304366A (en) * 1962-04-03 1967-02-14 Scm Corp Communications equipment printer
US3310146A (en) * 1964-09-11 1967-03-21 Marconi Co Ltd Belt mounted printer hammers movable by shortest distance to indexed position
US3331316A (en) * 1965-01-02 1967-07-18 Olivetti & Co Spa Printer having type drum with blank area and hammer on movable carriage
US3332343A (en) * 1966-06-20 1967-07-25 Andelex Corp Selective hammer interposing means in high speed printers
US3353483A (en) * 1967-04-06 1967-11-21 Potter Instrument Co Inc Laminated timing wheel for high speed printers
US3354818A (en) * 1964-10-16 1967-11-28 Philips Corp Electro-mechanical serial printers
US3364852A (en) * 1965-11-12 1968-01-23 Friden Inc High-speed print drum with traveling print hammer
US3397766A (en) * 1966-03-01 1968-08-20 Hasler Ag Printer having plural hammers and a single hammer actuating means
US3399274A (en) * 1964-10-15 1968-08-27 Teletype Corp Page printer
DE1282658B (en) * 1966-02-02 1968-11-14 Alfred Wolfgang Rudolph Printing unit with circumferential type carrier
US3415184A (en) * 1966-04-12 1968-12-10 Olivetti & Co Spa High speed serial printing device for teleprinters, accounting machines and data processing equipments
US3417690A (en) * 1962-10-25 1968-12-24 Scm Corp Rolling contact printer hammer and hammer carriage
US3420164A (en) * 1964-12-23 1969-01-07 Int Computers Ltd Cyclically operable printing and proportional spacing apparatus
US3424291A (en) * 1967-08-28 1969-01-28 Friden Inc Carriage drive for high-speed printer
US3433153A (en) * 1967-12-29 1969-03-18 Ibm Printer with swiveling pushrods
DE1291753B (en) * 1965-08-24 1969-04-03 Philips Patentverwaltung Electrically or manually controllable printing unit
DE1294713B (en) * 1966-07-20 1969-05-08 Kienzle Apparate Gmbh Printing device for flying printing with a continuously rotating type roller
US3472352A (en) * 1967-06-28 1969-10-14 Burroughs Corp High speed serial printer
US3476044A (en) * 1968-01-08 1969-11-04 Datamark Inc Linear type font oscillating means for high speed printers and the like
US3507214A (en) * 1969-06-13 1970-04-21 Scm Corp Print hammer module apparatus
US3554347A (en) * 1968-04-29 1971-01-12 Burroughs Corp System for automatically setting a position counter to effect agreement with the position of a traveling printing element
US3613083A (en) * 1967-04-14 1971-10-12 Olivetti & Co Spa Tabulating and printing operations in a printing device for program controlled electronic computers
US3618514A (en) * 1969-06-24 1971-11-09 Mohawk Data Sciences Corp Apparatus for producing incremental movement, particularly for moving a print hammer module parallel to a print line
US3665850A (en) * 1969-08-25 1972-05-30 New England Merchants National Selective belt printing apparatus for printing a line at a time
US3672297A (en) * 1970-06-30 1972-06-27 Ibm Printing control device in high speed chain printer with hammers movable to plural print positions
US3696739A (en) * 1970-05-04 1972-10-10 American Regital Corp Striking apparatus for rotating wheel printer
US3719139A (en) * 1970-07-14 1973-03-06 Honeywell Inf Systems Italia High-speed printer with selectively operable print hammer
US3750794A (en) * 1970-12-01 1973-08-07 Burroughs Corp High speed print drum with traveling print hammer
US3782278A (en) * 1970-12-11 1974-01-01 Tally Corp Impact line printer
US3817365A (en) * 1972-08-09 1974-06-18 Triumph Werke Nuernberg Ag Automatic print head shifting device
US3988984A (en) * 1974-11-06 1976-11-02 U.S. Philips Corporation Printing device comprising a distance roller
DE3333280A1 (en) * 1983-01-29 1984-08-02 Alps Electric Co., Ltd., Tokio/Tokyo PRINTERS WITH A NUMBER OF INDIVIDUAL TYPE GROUPS

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JPS51145627A (en) * 1976-05-27 1976-12-14 Centronics Data Computer High speed printer for dot matrix typewriter

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Cited By (41)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3236351A (en) * 1961-12-05 1966-02-22 Ibm High speed matrix printer
US3304366A (en) * 1962-04-03 1967-02-14 Scm Corp Communications equipment printer
US3291909A (en) * 1962-10-25 1966-12-13 Scm Corp Drum printer
US3417690A (en) * 1962-10-25 1968-12-24 Scm Corp Rolling contact printer hammer and hammer carriage
US3196783A (en) * 1963-05-10 1965-07-27 Potter Instrument Co Inc Printer magnet core
US3212435A (en) * 1963-07-01 1965-10-19 Ibm High speed printer with reciprocable type bar
US3291042A (en) * 1963-09-16 1966-12-13 Clary Corp High speed printing mechanism
US3269510A (en) * 1964-04-17 1966-08-30 Electronic Associates Symbol printer with means to print in two directions
US3279365A (en) * 1964-05-15 1966-10-18 Invac Corp High speed belt printer with comparison means
US3310146A (en) * 1964-09-11 1967-03-21 Marconi Co Ltd Belt mounted printer hammers movable by shortest distance to indexed position
US3399274A (en) * 1964-10-15 1968-08-27 Teletype Corp Page printer
US3354818A (en) * 1964-10-16 1967-11-28 Philips Corp Electro-mechanical serial printers
US3283869A (en) * 1964-10-26 1966-11-08 Hughes Aircraft Co Striking letter automatic wheel printer for use on flat surfaces
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