US3354818A - Electro-mechanical serial printers - Google Patents

Electro-mechanical serial printers Download PDF

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Publication number
US3354818A
US3354818A US496037A US49603765A US3354818A US 3354818 A US3354818 A US 3354818A US 496037 A US496037 A US 496037A US 49603765 A US49603765 A US 49603765A US 3354818 A US3354818 A US 3354818A
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US
United States
Prior art keywords
hammer
hammers
type cylinder
place
printing
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US496037A
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English (en)
Inventor
Haas Gerhard
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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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
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K15/00—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers
    • G06K15/02—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers
    • G06K15/06—Arrangements for producing a permanent visual presentation of the output data, e.g. computer output printers using printers by type-wheel printers

Definitions

  • electro-magnetic printers operating on the principle of high-speed printers have been used for this purpose.
  • the ink carrier and the paper are arranged between the continuously or stepwise rotating type cylinder, the periphery of which has a set of characters for each place to be printed, and a group of magnetically operated hammers, that is to say one for each place.
  • Printing of a line is carried out so that first, for example, all noughts, then all 1s and so on are printed in parallel.
  • This principle is not satisfactory for simple ofiice machines because the attainable speed of printing is much higher than is required for these simple uses, and because a magnet has to be controlled and energized for each place to be printed.
  • printers comprising only one hammer, which is advanced along the line so that the separate places are printed in order of succession. For each place the hammer is actuated at that instant at which the desired character is located opposite the hammer. In view of the discontinuously moving large mass this print- .ing method is too slow.
  • the invention relates to an electro-mechanical serial printer having a rotating type cylinder and magnetically controllable hammers.
  • the material to be printed is moved stepwise between the hammers.
  • a con 3,354,813 Patented Nov. 28, 1967 tinuously movable hammer carrier the structure of which is such that in order of succession each time one hammer for the separate place gets in between the type cylinder and the magnet, the latter is energized when the desired sign is located opposite the hammer.
  • the novel serial printer has the advantage that only one magnet need be controlled, so that space and electronic apparatus can be economized, such a printer being therefore suitable for simple printing machines.
  • FIG. 1 shows a printer comprising a disc operating as the hammer carrier.
  • FIG. 2 shows a printer comprising a hammer carrier in the form of a tape.
  • FIG. 3 shows a printer comprising a cylindrical hammer carrier.
  • FIG. 4 is a diagrammatic plan view of the disc-shaped hammer carrier.
  • FIG. 5 is a developed view of the type cylinder allowing scanning in the horizontal direction.
  • FIG. 6 shows diagrammatically the circuitry of the electronic control suitable for use in horizontal scanning of the type cylinder.
  • FIG. 7 shows a further embodiment of the electronic circuitry suitable for vertical scanning of the type cylinder.
  • the printer shown in FIG. 1 comprises, a type cylinder T, a disc H, operating as a hammer carrier and having, for each place of the type cylinder, a hammer h the hammers being arranged along a helical line (see hammers I1 h h 11 it I11 FIG. 4).
  • the hammer disc H and the type cylinder T move with uniform speed and are coupled through a worm wheel transmission G so that the axes of rotation are at right angles to each other.
  • the separate hammers h are disposed so that each time after 21r/s-revolutions of H the next-following hammer arrives in front of the next-following place of the type cylinder.
  • the ink tape F and the paper to be printed P are arranged between the type cylinder T and the hammer disc H. Behind the hammer disc is located the printing magnetM the armature of which E has approximately the height of the characters and the width of the type cylinder.
  • the hammer disc is constructed so that only one hammer h can be struck at one time by the armature.
  • the type cylinder T is provided on its periphery with a set of signs for each place to be printed.
  • the paper driving member is formed by the two pressure rollers R and R and the electro-magnet M which turns the rollers R at each pulse through the angle defined by the line space.
  • the hammers disc H and the type cylinder are each rigidly connected with a control-disc S and S respectively, which provide for example by photoelectric scanning, the-required synchronizing signals, which will be explained more fully hereinafter.
  • the hammer carrier may be an endless tape or a rotating drum.
  • the printing magnet M is located in side the tape i.e. inside tape K (FIG. 2) and in the case of the drum it is located inside the drum Z (FIG. 3).
  • the hammers h themselves are mounted in this instance, on small springs f at the periphery of the drum in a helical array so that during the uniform rotation of the drum the separate places of the type cylinder T are covered in order of succession.
  • FIGS. 1 and 3 two methods of operation are possible in the embodiments shown in FIGS. 1 and 3, that is to say: vertical and horizontal scanning of the information to be printed; in the embodiment shown in FIG. 2 only horizontal scanning is possible.
  • the two scanning modes will be described more fully with reference to the embodiment of the printer shown in FIG. 1.
  • the places of a line are covered once for each sign of the type cylinder T.
  • the type cylinder comprises a set of B signs and L voids, the paper being displaced to the next-following line during the voids.
  • all 8s" etc. of the line are printed in order of succession. Since in one revolution of the hammer disc H all places are covered, the hammer disc has to turn a number of times equal to the sum of the number of signs and the number of voids, whereas the type cylinder performs at the same time one revolution. This requires a reducing transmission between the motor-driven hammer disc and the type cylinder. After one revolution of the hammer disc H the type cylinder T has turned through an angle (,0. The separate signs of the type cylinder must have shifted through said angle (p (FIG.
  • the hammers Since synchronisation fluctuation will occur between the place where the hammers and the armature E come into contact with each other, the hammers are not accurately struck at the correct place.
  • the hammers may be constructed in the form of circular members, that is, having a circular striking area.
  • the highest sequential frequency of the printing magnet occurs when the same signs are to be printed at adjacent places.
  • the control-disc S supplies a pulse for each hammer and hence for each place of the line.
  • the controldisc S as is shown in FIG. 6, has two slots L and L marking the beginning and the end of printing.
  • the slot L is associated with the first sign to be printed and the slot L with the last sign to be printed.
  • the paper is shifted.
  • the accurate location of the slots is suchthat the signal P supplied by the lightsensitive member F coincides with the signal P supplied by the light-sensitive member F corresponding to the first place to be printed.
  • the signal of the slot L is located closely after the signal P of the last place.
  • the operation of the, printer will be explained with reference to FIG. 6 for a numerical printer with places.
  • the type cylinder T and the hammer disc H are continuously driven by the motor M.
  • the bistable trigger FFl cuts off the gate U so that the pulses P remain ineffective.
  • the bistable trigger FFZ is also in the zero position so that p pulses, intended to reset FFZ to the initial position, have no effect.
  • the zero position of FFZ cuts off the gates U and U so that neither the 1 pulses in an accumulator A of an arithmetic member or the like nor the carry pulses p produced at the accumulator place a (during the arithmetic operation) can become operative.
  • the printing order p passed through I renders FFI operative.
  • the next-following p pulse which coincides with the p pulse of the first place, can pass through the gate U and sets F1 2 so that the gates U and U are opened.
  • a pulse from the slot L in F cannot pass U since it does not coincide with a 2 pulse.
  • the digit 9 is in front of the paper and the hammer h, in front of the first place.
  • the front flank of the associated p pulse raises the content of the first storage place a by 1. If at a a 9 was present, the resultant carry through the gate U subsequent to amplification in V renders the printing magnet M operative, so that at the first place the digit 9 is printed.
  • the rear flank of 7 supplies the shift pulse for the storage so that the second place is then at a
  • the F5 pulse raises again the content of a by 1. If also the second place is a 9, printing is again performed, etc.
  • the maximum sequential frequency of the printing magnet is about 220 c./s.
  • the type cylinder T covers each place before the hammer disc H has turned to the next-following place.
  • the type cylinder has at its periphery a set of signs for each place. Apart from the hammers the hammer disc has voids, the paper being displaced when the latter are covered. For printing one line the type cylinder must perform a number of revolutions equal to the sum of the number hammers and of voids.
  • the separate hammers h;, 11 I1 h, of the hammer disc must have circular faces in order to cover the separate places until the set of signs has passed by. Since the printing magnet must engage each time only one hammer, printing must not be effected during the transition from a hammer h to the hammer h The maximum sequential frequency of the printing magnet occurs when the last or the first sign has to be printed at adjacent places. Then the printing interval corresponds to the L voids. A great number of Voids requires great accuracy in synchronisation, but on the other hand a low maximum printing frequency.
  • the control-disc S has a slot L by which the shift pulses P3 are supplied and for each of the signs a slot L
  • the light-sensitive member F supplies during each revolution of the type cylinder a number of pulses corresponding with the number of signs and the light-sensitive member F supplies one pulse.
  • the controldisc S has two slots L and L which determine the beginning and the end of a line to be printed.
  • the slot L is associated with the first place and the slot L, with the last place. In the space between L and L,, which corresponds to the voids, the paper is displaced.
  • the accurate position of the light-sensitive member is chosen so that the signal p supplied by F coincides with the signal pg supplied by F of the first sign of the set of signs. The signal from the slot L appears, however, closely after the p signal of the last sign.
  • the motor drives the type cylinder T, which drives through the worm wheel transmission G the hammer disc H with reduced speed.
  • the bistable trigger FFI cuts off the gate U so that the p pulses have no effect.
  • the bistable trigger FFZ is also in zero position, so that the p pulses, having to reset FFZ to zero, remain inoperative.
  • the adjustment of FF2 to zero cuts off the gates U U and U so that neither the 2 pulses nor the shift pulses p in the storage A can become operative.
  • the carry pulses p; produced during the arithmetical operation in the last place of the storage a remain inoperative.
  • the printing order P renders FFI conducting.
  • the next-following pulse p. which, as stated above, coincides with the first sign pulse ppasses through the gate U and sets FF2, after which the gates U U and U, are opened (the pulse produced previously by the slot L cannot pass through U since it does not coincide with any p pulse).
  • the hammer k is located opposite the first place and the digit is in front of the printing position.
  • the p pulse raises the content of the first storage place a by 1. If a 9 is found at 'a the resultant carry through the gate U subsequent to amplification in V renders the printing magnet M inoperative, so that the 9 is printed at the first place.
  • Each new sign arriving in the printing position raises by its ppulse the content of a by 1.
  • the slot L supplies a shift pulse p which moves the second place of the storage to the position a
  • a After the L voids have been covered, a again receives 10 pulses, which cause printing of the second place in accordance With the content of a
  • the slot L produces the pulse p which resets FFZ to the initial position.
  • the output voltage pulse resulting therefrom serves as a starting signal for the paper transport and resets FFl to its initial state. If no further printing order follows, no printing is carried out during the further revolution of the type cylinder.
  • An electromechanical serial printer comprising a rotatable type cylinder having a plurality of raised characters thereon, a plurality of magnetically controllable hammers, each of said hammers having a striking face, means for advancing a printing material between said hammers and said cylinder, a continuously rotatable hammer carrier, the axis of rotation of said type drum being parallel to the plane of the striking face of a hammer in striking position, said plurality of hammers being arranged on the face of said hammer carrier in a helical array about the axis of rotation of said carrier, a selectively operable magnet, means sequentially rotating said carrier and positioning each of said hammers into striking position between said printing material and said magnet in synchronism with the movement of said type cylinder and means 6 responsive to the position of said type cylinder to selectively actuate said magnet when a desired character is in front of a hammer in striking position.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Impact Printers (AREA)
  • Printers Or Recording Devices Using Electromagnetic And Radiation Means (AREA)
US496037A 1964-10-16 1965-10-14 Electro-mechanical serial printers Expired - Lifetime US3354818A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP35286A DE1262053B (de) 1964-10-16 1964-10-16 Elektromechanischer Seriendrucker

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US3354818A true US3354818A (en) 1967-11-28

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US496037A Expired - Lifetime US3354818A (en) 1964-10-16 1965-10-14 Electro-mechanical serial printers

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US (1) US3354818A (de)
BE (1) BE671003A (de)
CH (1) CH445160A (de)
DE (1) DE1262053B (de)
FR (1) FR1450177A (de)
GB (1) GB1129711A (de)
NL (1) NL6513168A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044668A (en) * 1975-05-16 1977-08-30 Printronix, Inc. Print hammer mechanism
US4437777A (en) 1981-02-02 1984-03-20 Alps Electric Co., Ltd. Printer having plural type wheel assembly
US20080078149A1 (en) * 2006-10-03 2008-04-03 Mark Huza Filter removal bag

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2656240A (en) * 1948-12-20 1953-10-20 Siemens Ag Recording apparatus for the reception of message characters
US2689520A (en) * 1952-10-09 1954-09-21 Abe A Katz Machine for printing price tags for merchandise and the like
US2757775A (en) * 1953-01-19 1956-08-07 Ibm Single printing element typewriter
US2843243A (en) * 1955-08-09 1958-07-15 Sperry Rand Corp Printing device
US2874634A (en) * 1956-02-14 1959-02-24 Olympia Werke Ag Printing apparatus
US2949846A (en) * 1958-03-28 1960-08-23 Burroughs Corp Printing mechanism
US3135195A (en) * 1961-06-22 1964-06-02 Potter Instrument Co Inc High speed printer with moving characters and single hammer
US3209682A (en) * 1962-08-30 1965-10-05 Ibm Type carrier for high speed printer
US3212435A (en) * 1963-07-01 1965-10-19 Ibm High speed printer with reciprocable type bar
US3247788A (en) * 1966-04-26 Rotary high speed print drum with staggered type columns
US3256969A (en) * 1962-12-17 1966-06-21 Olivetti & Co Spa High speed serial printing device
US3282205A (en) * 1964-05-19 1966-11-01 Sperry Rand Corp Print control means for high speed printer with traveling print bar

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT155707B (de) * 1934-07-19 1939-03-10 Ronald George Griffith Übertragungseinrichtung für Telegraphenempfangs-, Registriergeräte u. dgl.
DE838322C (de) * 1949-07-01 1952-05-23 Siemens Ag Verfahren zur UEbertragung von Schriftzeichen
US2720586A (en) * 1950-12-30 1955-10-11 Ibm Counting circuit for photographic recorder
US2776618A (en) * 1953-06-11 1957-01-08 Hughes Aircraft Co Printing cylinders for high-speed printing systems
DE1101026B (de) * 1955-06-13 1961-03-02 Sperry Rand Corp Schnellarbeitende automatische Druckmaschine
NL263314A (de) * 1960-04-07
USRE26240E (en) * 1960-11-25 1967-07-18 High speed printers with column spanning hammers
FR1328069A (fr) * 1961-06-22 1963-05-24 Potter Instrument Co Inc Imprimeuse à grande vitesse

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3247788A (en) * 1966-04-26 Rotary high speed print drum with staggered type columns
US2656240A (en) * 1948-12-20 1953-10-20 Siemens Ag Recording apparatus for the reception of message characters
US2689520A (en) * 1952-10-09 1954-09-21 Abe A Katz Machine for printing price tags for merchandise and the like
US2757775A (en) * 1953-01-19 1956-08-07 Ibm Single printing element typewriter
US2843243A (en) * 1955-08-09 1958-07-15 Sperry Rand Corp Printing device
US2874634A (en) * 1956-02-14 1959-02-24 Olympia Werke Ag Printing apparatus
US2949846A (en) * 1958-03-28 1960-08-23 Burroughs Corp Printing mechanism
US3135195A (en) * 1961-06-22 1964-06-02 Potter Instrument Co Inc High speed printer with moving characters and single hammer
US3209682A (en) * 1962-08-30 1965-10-05 Ibm Type carrier for high speed printer
US3256969A (en) * 1962-12-17 1966-06-21 Olivetti & Co Spa High speed serial printing device
US3212435A (en) * 1963-07-01 1965-10-19 Ibm High speed printer with reciprocable type bar
US3282205A (en) * 1964-05-19 1966-11-01 Sperry Rand Corp Print control means for high speed printer with traveling print bar

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4044668A (en) * 1975-05-16 1977-08-30 Printronix, Inc. Print hammer mechanism
US4437777A (en) 1981-02-02 1984-03-20 Alps Electric Co., Ltd. Printer having plural type wheel assembly
US20080078149A1 (en) * 2006-10-03 2008-04-03 Mark Huza Filter removal bag

Also Published As

Publication number Publication date
BE671003A (de) 1966-04-15
FR1450177A (fr) 1966-05-06
DE1262053B (de) 1968-02-29
NL6513168A (de) 1966-04-18
CH445160A (de) 1967-10-15
GB1129711A (en) 1968-10-09

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