US2910935A - High speed printer - Google Patents

High speed printer Download PDF

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Publication number
US2910935A
US2910935A US665328A US66532857A US2910935A US 2910935 A US2910935 A US 2910935A US 665328 A US665328 A US 665328A US 66532857 A US66532857 A US 66532857A US 2910935 A US2910935 A US 2910935A
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United States
Prior art keywords
type wheels
wheels
type
shaft
shot
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Expired - Lifetime
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US665328A
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English (en)
Inventor
Cignetti Luciano
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Olivetti SpA
TIM SpA
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Olivetti SpA
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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
    • B41J1/32—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 parallel to the axis of rotation, e.g. with type on the periphery of cylindrical carriers
    • B41J1/44—Carriers stationary for impression

Definitions

  • This invention relates to a high speed printer of the kind generally using a set of type wheels arranged sideby-side and each carrying a plurality of types, said printer being particularly useful as an output unit for high speed data processing equipments, electronic computers and similar devices.
  • a high speed printer a set of type wheels frictionally driven through consecutive cycles by a continuously rotating member associated with a clock signal generator.
  • I further provide a common zeroizing mechanism operable for arresting all the type wheels of said set in a predetermined mutual position, control means settable to operate said zeroizing mechanism and timing means having a period at least as long as one cycle of said type wheels.
  • Means jointly controlled by said generator and said timing means are provided for unsetting said control means to enable the type wheels to resume their rotation from said position in synchronism with the clock signals generated by said generator.
  • the type wheels normally rotate at random and only upon starting an operating cycle they are first mutually aligned and thereupon they resume rotation in a timed relation with the clock signal generator, whereby the sequential steps of the type Wheels will be in perfect synchronism with the clock signals.
  • Fig. l is a longitudinal sectional view showing a printer embodying the invention.
  • Fig. 2 is a block diagram showing the electronic circuit for controlling the printer shown in Fig. 1;
  • Fig. 3 is a partial top plan view of the printer.
  • the reference numeral 1 indicates a shaft supported by the printer frame and continuously driven by a motor not shown in the drawings.
  • a set of type wheels 2 mounted on the shaft 1 is a set of type wheels 2 arranged side-by-side and frictionally driven by the shaft 1 in the manner described, as for example, in applicants Italian Patent No. 510,783.
  • Each type wheel 2 is provided with eleven teeth 3,
  • bail 6 is normally disengaged from the teeth 5 by the urge of a spring 7 and is operable by a solenoid 8 to engage all the teeth 5, whereby all the wheels 2 may be arrested in a predetermined mutual position which in the present embodiment will be their non print position.
  • Rockably mounted on a further pivot 45 is a set of detent levers 9, each detent lever being operable by a solenoid 11 against the urge of a spring 10 to engage a selected one of the teeth 3 of the corresponding type wheel 2, whereby a selected type 4 may be set in a printing position.
  • shaft 16 is adapted to be frictionally driven by the motor through a slip-coupling not shown in the drawings and is normally prevented from rotating by a detent lever 47 operable by a solenoid 18.
  • speed of the shaft 16 is half the speed of the shaft 1, whereby due to the position of the crank pin 15 on the disc 17 the shaft 1 will turn through a little more than a full revolution before the platen 12 upon being thrown leftwards strikes against the type wheels 2.
  • a clock signal generator comprising a toothed magnetic disc 19 whose teeth, which are eleven like those of the type wheels 2, co operate with a magnetic pick-up head 20.
  • the reluctance variation which occurs as the teeth of the disc 19 pass between the pole pieces of the head 20 induces therein a voltage which is then amplified and shaped at 21 to ob tain a suitable clock signal S in a manner well known in the art.
  • a suitable amplifying and shaping circuit is shown in the United States Patent 2,609,143, Fig. 4.
  • the frequency of the clock signals S is determined both by the number of revolutions of the shaft 1 and the teeth number of the disc 19. In the present embodiment eleven clock signals S are generated at each revolution of the shaft 1.
  • FIG. 2 an electronic circuit is shown which is timed by the clock signals S to suitably control the energization of the solenoids 8, 11 and 18.
  • This circuit makes use of conventional components, such as andgates, one-shot multivibrators, flip-flops, switches, delay units and counters, which are well known in the art, as
  • the circuit comprises a first part A controlling the sequence of the zeroizing, selecting and printing phases which form an operating cycle of the printer, and a second part B controlling the selective arrest of the type wheels 2 according to an item to be printed.
  • a start signal is applied in a known way to the input terminal 22.
  • this signal trips over a timing means including a one-shot or univibrator 24 of the type described in the cited book with reference to page 87 and Figs. 2.33.
  • the one-shot 24 in turn through a condenser 25 sets a control means such as a flip-flop 26 to its state II thus triggering a switch 27 adapted to cause energization of the solenoid 8.
  • the one-shot 24 upon returning to its initial. state sends a signal through a condenser 28 to a flip-flop 29 which will thus be set to its state II.
  • one-shot'31' opens an and-gate 32 which also has an input supplied by the clock signals S.
  • Thefirst signal outgoing from said and-gate 32 resets both theflip-flop 26i-and, through a delay'unit 33, the flipfiop 29.
  • the flip-flop-26 Upon being reset to the state I the flip-flop-26 further triggers through a condenser 34a switch 35 controlling energization'of the solenoid 18.
  • the switch 35 may be, by way of example, of the thyratron type shown in the United States Patent 2,692,551, Fig; 5.
  • the solenoid 18 On being energized the solenoid 18releases the disk 17 thus allowing the shaft 16 to start rotation.
  • the shaft 16 At the end of-rone revolution the shaft 16 is adapted byiknown means to operate a switch 36, 36 36 (Fig.2) inserted in the supply circuits of the solenoid 18 and the solenoids 11 11,,, to the end of transitorily opening said circuits.
  • the part Bofv the electronic'circuit performs the selection of the characters to be printed.
  • Thispart comprises as many identicallcircuit arms as are the type wheels 2- whichiare supposed to be arranged in n denominational orders.
  • acounter 37 digit of an item to be printed is set up and then a sequence of impulses is entereduntil the counter is filled up, such a counter: being usually referred to as predetermined counter.
  • This ..item-comes from astore 38 which for instance may beof the well known typeofmain or auxiliary store used in electronic computers.
  • Each counter 37 is of the type formed, as for example, of a chain'of flip-flops and shown in the cited book, pages 209 to 212 and 'Fig. 4.3.
  • each gate 39 Upon trip-over the one-shot 31 opens both the andgate 32, as described above, and a set of and-gates 39, thus allowing the signals S to enter the selecting circuit and to initiate type selection, one gate 39 being provided for each denominational circuit arm.
  • the output signals ofeach gate 39 pass a delay unit 40 and a condenser 41. and'sequentiallyenter the corresponding counter 37, wherein they are added to the digit previously setup.
  • each counter 37 Upon: beingiilled up each counter 37 is automatically cleared thereby'generating an output pulse which through a condenser 42 triggers a switch 43.
  • the latter switch maybe of the above mentioned thyratron type and causes energization of the corresponding solenoid '11..
  • the counter 37 remains locked by known means until a new item is set up therein.
  • each type wheel 2 will be 'arre'stedup'on having advanced anumben of-steps con-- ditioned by-the-digi-t set-upin the corresponding counter. More particularly, if a digit x to be printed is setup in a counter-37,'the numberrof signals S required to fill up the counter and therefore the number of steps made by the corresponding' type-wheel 2" will be equal, in the present embodiment, to theten complement of x, provided the types 4 are arranged as shown in Fig. 1.
  • suitabledelay units 40 are provided having a delay adjustable at will.
  • a printer operates as follows; After having, set up; an item in the counters 37 37, a start signal is applied to the input terminal 22. This signal trips 'over the one-shot 24 which in turn sets the flip-flop 26 to its-state II. The solenoid 8'is thus energized and moves the bail 6 into engagement with the zeroizinggteeth 5.
  • the type wheels:2,which had been angularly positioned with respect to the shaft 1 according to the types selected -in' the next preceding cycle are,v therefore, aligned in their non print position.
  • the one-shot 24 sets the flipfiop 29 to .its state II, whereby the first signal S thereafter generated will trip over the one shot 31.
  • the latter allows the-same'signal S to resetthe flip-flop 26 thus bothdeenergizing the solenoid 8, whereby the type wheels 2 aligned as above start again'rotation, and energizing-the solenoid 1S,- whereby the-shaft 16 is started.
  • the one-shot 31 further enables the andgates 39 to allow-the signals S to'enter the-counters-37.
  • the one-shot 31 shuts the gates 32 and'39,'while at the end of one revolution of the shaft 16 the switch 36 causes the shaft 16 to be stopped and the detent levers 9 to release the type wheels 2.
  • the printer isthus restored to normal and is adapted toinitiate anew operating cycle.
  • a high speed printer a set of type wheels, a continuously rotating member for frictionally driving said wheels through consecutive cycles, a clock signal generator associated with said member, a normally ineffective common zeroizing mechanism operable for arresting all the type wheels of said set in a predetermined mutual position, control means settable irrespective of the instantaneous angular position of said rotating member to operate said zeroizing mechanism, timing means having a period at least as long as one cycle of said type wheels, and means jointly controlled by said generator and said timing means for unsetting said control means to enable said type wheels to resume their rotation from said position in synchronism with the clock signals generated by said generator.
  • a set of type wheels a continuously rotating member for frictionally driving said wheels through consecutive cycles, a clock signal generator associated with said member, a normally ineffective common zeroizing mechanism operable for arresting all the type wheels of said set in a predetermined mutual position, normally inefiective individual arresting means operable for selectively arresting said type wheels according to an item to be printed, control means settable irrespective of the instantaneous angular position of said rotating member to operate said zeroizing mechanism, timing means having a period at least as long as one cycle of said type wheels, and means jointly controlled by said generator and said timing means for unsetting said control means to enable said type wheels to resume their rotation from said position and for rendering said individual arresting means efiective.
  • a set of type wheels a continuously rotating member for frictionally driving said wheels through consecutive cycles, a clock signal generator associated with said member, a common zeroizing mechanism operable for arresting all the type wheels of said set in a predetermined mutual position, a one-shot multivibrator having a period at least as long as one cycle of said type wheels, control means settable by said multivibrator upon trip-over to operate said zeroizing mechanism, and means jointly controlled by said generator and said multivibrator upon return of the latter to its initial state for unsetting said control means to enable said type wheels to resume their rotation from said position.
  • a set of type wheels in a high speed printer, a set of type wheels, a continuously rotating member for frictionally driving said wheels through consecutive cycles, a clock signal generator associated with said member, a common zeroizing mechanism operable for arresting all the type wheels of said set in a predetermined mutual position, normally ineffective individual arresting means operable for selectively arresting said type wheels according .to an item to be printed, a first and a second one-shot multivibrator each having a period at least as long as one cycle of said type wheels, said second multivibrator be ing controlled by said first multivibrator to be tripped over substantially on the return of said first multivibrator to its initial state, control means settable by said first multivibrator upon trip-over to operate said zeroizing mechanism, and means jointly controlled by said generator and said second multivibrator upon trip-over of the latter for unsetting said control means to enable said type wheels to resume their rotation from said position and for rendering said individual arresting means effective.
  • a set of type wheels a continuously rotating member for frictionally driving said wheels through consecutive cycles, a clock signal generator associated with said member, a common zeroizing mechanism operable for arresting all the type Wheels of said set in a predetermined mutual position, normally inefiective individual arresting means operable for selectively arresting said type wheels according to an item to be printed, a first and a second one-shot multivibrator each having a period at least as long as one cycle of said type wheels, said second multivibr-ator being controlled by said first multivibrator to be tripped over substantially on the return of said first multivibrator to its initial state, control means settable by said first multivibrator upon trip-over to operate said zeroizing mechanism, means jointly controlled by said generator and said second multivibrator upon trip-over of the latter for unsetting said control means to enable said type wheels to resume their rotation from said position, and a set of predetermined counters jointly controlled by said generator and said second multivibrator for rendering

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  • Character Spaces And Line Spaces In Printers (AREA)
US665328A 1956-06-19 1957-06-12 High speed printer Expired - Lifetime US2910935A (en)

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Application Number Priority Date Filing Date Title
IT347988X 1956-06-19

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US2910935A true US2910935A (en) 1959-11-03

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US (1) US2910935A (it)
CH (1) CH347988A (it)
DE (1) DE1101835B (it)
FR (1) FR1178550A (it)
GB (1) GB816971A (it)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3139822A (en) * 1961-12-02 1964-07-07 Atvidabergs Ind Ab Line printer
US3171348A (en) * 1958-07-19 1965-03-02 Wetzer Hermann Type wheel indexing mechanism in high speed printing and counting devices
US3304858A (en) * 1963-12-23 1967-02-21 Mathatronics Inc Electromechanical printing system for digital systems
US3702097A (en) * 1971-08-19 1972-11-07 Interface Ind Inc Anti-hammer apparatus for powered imprinters
US3732812A (en) * 1971-03-04 1973-05-15 Ncr Differentially positionable type wheels in remotely controlled print modules
US3747517A (en) * 1971-05-06 1973-07-24 Maks Apparatebau Brede F Type wheel setting and locking means and print actuating means in selective printers
USB287373I5 (it) * 1971-09-10 1975-01-28
US3875859A (en) * 1973-10-12 1975-04-08 Addmaster Corp High speed printer

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1030270B (it) * 1975-03-05 1979-03-30 C Olivetti Ing Dispositivo di scriturra per macchine per scrivere, contabili, telescriventi e simili macchine per ufficio

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1675969A (en) * 1925-02-20 1928-07-03 Hilditch Ernst Automatic printing machine
US2133865A (en) * 1936-01-08 1938-10-18 Boiteaux Eugene M La Mechanical tabulator alphabetical indexing mechanism
US2157035A (en) * 1936-09-05 1939-05-02 Ibm Printing mechanism
US2566944A (en) * 1946-09-19 1951-09-04 Ibm Typesetting means in record controlled printing machines
US2796830A (en) * 1955-08-12 1957-06-25 Hewlett Packard Co Data controlled selective printing system
US2799221A (en) * 1955-09-02 1957-07-16 Olivetti Corp Of America Printing mechanism

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1675969A (en) * 1925-02-20 1928-07-03 Hilditch Ernst Automatic printing machine
US2133865A (en) * 1936-01-08 1938-10-18 Boiteaux Eugene M La Mechanical tabulator alphabetical indexing mechanism
US2157035A (en) * 1936-09-05 1939-05-02 Ibm Printing mechanism
US2566944A (en) * 1946-09-19 1951-09-04 Ibm Typesetting means in record controlled printing machines
US2796830A (en) * 1955-08-12 1957-06-25 Hewlett Packard Co Data controlled selective printing system
US2799221A (en) * 1955-09-02 1957-07-16 Olivetti Corp Of America Printing mechanism

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3171348A (en) * 1958-07-19 1965-03-02 Wetzer Hermann Type wheel indexing mechanism in high speed printing and counting devices
US3139822A (en) * 1961-12-02 1964-07-07 Atvidabergs Ind Ab Line printer
US3304858A (en) * 1963-12-23 1967-02-21 Mathatronics Inc Electromechanical printing system for digital systems
US3732812A (en) * 1971-03-04 1973-05-15 Ncr Differentially positionable type wheels in remotely controlled print modules
US3747517A (en) * 1971-05-06 1973-07-24 Maks Apparatebau Brede F Type wheel setting and locking means and print actuating means in selective printers
US3702097A (en) * 1971-08-19 1972-11-07 Interface Ind Inc Anti-hammer apparatus for powered imprinters
USB287373I5 (it) * 1971-09-10 1975-01-28
US3918568A (en) * 1971-09-10 1975-11-11 Suwa Seikosha Kk Printing mechanism
US3875859A (en) * 1973-10-12 1975-04-08 Addmaster Corp High speed printer

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Publication number Publication date
CH347988A (it) 1960-07-31
GB816971A (en) 1959-07-22
FR1178550A (fr) 1959-05-12
DE1101835B (de) 1961-03-09

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